sctp_output.c revision 332172 
1/*-
2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * a) Redistributions of source code must retain the above copyright notice,
10 *    this list of conditions and the following disclaimer.
11 *
12 * b) Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in
14 *    the documentation and/or other materials provided with the distribution.
15 *
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 *    contributors may be used to endorse or promote products derived
18 *    from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/sys/netinet/sctp_output.c 332172 2018-04-07 14:41:44Z tuexen $");
35
36#include <netinet/sctp_os.h>
37#include <sys/proc.h>
38#include <netinet/sctp_var.h>
39#include <netinet/sctp_sysctl.h>
40#include <netinet/sctp_header.h>
41#include <netinet/sctp_pcb.h>
42#include <netinet/sctputil.h>
43#include <netinet/sctp_output.h>
44#include <netinet/sctp_uio.h>
45#include <netinet/sctputil.h>
46#include <netinet/sctp_auth.h>
47#include <netinet/sctp_timer.h>
48#include <netinet/sctp_asconf.h>
49#include <netinet/sctp_indata.h>
50#include <netinet/sctp_bsd_addr.h>
51#include <netinet/sctp_input.h>
52#include <netinet/sctp_crc32.h>
53#if defined(INET) || defined(INET6)
54#include <netinet/udp.h>
55#endif
56#include <netinet/udp_var.h>
57#include <machine/in_cksum.h>
58
59
60
61#define SCTP_MAX_GAPS_INARRAY 4
62struct sack_track {
63	uint8_t right_edge;	/* mergable on the right edge */
64	uint8_t left_edge;	/* mergable on the left edge */
65	uint8_t num_entries;
66	uint8_t spare;
67	struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
68};
69
70const struct sack_track sack_array[256] = {
71	{0, 0, 0, 0,		/* 0x00 */
72		{{0, 0},
73		{0, 0},
74		{0, 0},
75		{0, 0}
76		}
77	},
78	{1, 0, 1, 0,		/* 0x01 */
79		{{0, 0},
80		{0, 0},
81		{0, 0},
82		{0, 0}
83		}
84	},
85	{0, 0, 1, 0,		/* 0x02 */
86		{{1, 1},
87		{0, 0},
88		{0, 0},
89		{0, 0}
90		}
91	},
92	{1, 0, 1, 0,		/* 0x03 */
93		{{0, 1},
94		{0, 0},
95		{0, 0},
96		{0, 0}
97		}
98	},
99	{0, 0, 1, 0,		/* 0x04 */
100		{{2, 2},
101		{0, 0},
102		{0, 0},
103		{0, 0}
104		}
105	},
106	{1, 0, 2, 0,		/* 0x05 */
107		{{0, 0},
108		{2, 2},
109		{0, 0},
110		{0, 0}
111		}
112	},
113	{0, 0, 1, 0,		/* 0x06 */
114		{{1, 2},
115		{0, 0},
116		{0, 0},
117		{0, 0}
118		}
119	},
120	{1, 0, 1, 0,		/* 0x07 */
121		{{0, 2},
122		{0, 0},
123		{0, 0},
124		{0, 0}
125		}
126	},
127	{0, 0, 1, 0,		/* 0x08 */
128		{{3, 3},
129		{0, 0},
130		{0, 0},
131		{0, 0}
132		}
133	},
134	{1, 0, 2, 0,		/* 0x09 */
135		{{0, 0},
136		{3, 3},
137		{0, 0},
138		{0, 0}
139		}
140	},
141	{0, 0, 2, 0,		/* 0x0a */
142		{{1, 1},
143		{3, 3},
144		{0, 0},
145		{0, 0}
146		}
147	},
148	{1, 0, 2, 0,		/* 0x0b */
149		{{0, 1},
150		{3, 3},
151		{0, 0},
152		{0, 0}
153		}
154	},
155	{0, 0, 1, 0,		/* 0x0c */
156		{{2, 3},
157		{0, 0},
158		{0, 0},
159		{0, 0}
160		}
161	},
162	{1, 0, 2, 0,		/* 0x0d */
163		{{0, 0},
164		{2, 3},
165		{0, 0},
166		{0, 0}
167		}
168	},
169	{0, 0, 1, 0,		/* 0x0e */
170		{{1, 3},
171		{0, 0},
172		{0, 0},
173		{0, 0}
174		}
175	},
176	{1, 0, 1, 0,		/* 0x0f */
177		{{0, 3},
178		{0, 0},
179		{0, 0},
180		{0, 0}
181		}
182	},
183	{0, 0, 1, 0,		/* 0x10 */
184		{{4, 4},
185		{0, 0},
186		{0, 0},
187		{0, 0}
188		}
189	},
190	{1, 0, 2, 0,		/* 0x11 */
191		{{0, 0},
192		{4, 4},
193		{0, 0},
194		{0, 0}
195		}
196	},
197	{0, 0, 2, 0,		/* 0x12 */
198		{{1, 1},
199		{4, 4},
200		{0, 0},
201		{0, 0}
202		}
203	},
204	{1, 0, 2, 0,		/* 0x13 */
205		{{0, 1},
206		{4, 4},
207		{0, 0},
208		{0, 0}
209		}
210	},
211	{0, 0, 2, 0,		/* 0x14 */
212		{{2, 2},
213		{4, 4},
214		{0, 0},
215		{0, 0}
216		}
217	},
218	{1, 0, 3, 0,		/* 0x15 */
219		{{0, 0},
220		{2, 2},
221		{4, 4},
222		{0, 0}
223		}
224	},
225	{0, 0, 2, 0,		/* 0x16 */
226		{{1, 2},
227		{4, 4},
228		{0, 0},
229		{0, 0}
230		}
231	},
232	{1, 0, 2, 0,		/* 0x17 */
233		{{0, 2},
234		{4, 4},
235		{0, 0},
236		{0, 0}
237		}
238	},
239	{0, 0, 1, 0,		/* 0x18 */
240		{{3, 4},
241		{0, 0},
242		{0, 0},
243		{0, 0}
244		}
245	},
246	{1, 0, 2, 0,		/* 0x19 */
247		{{0, 0},
248		{3, 4},
249		{0, 0},
250		{0, 0}
251		}
252	},
253	{0, 0, 2, 0,		/* 0x1a */
254		{{1, 1},
255		{3, 4},
256		{0, 0},
257		{0, 0}
258		}
259	},
260	{1, 0, 2, 0,		/* 0x1b */
261		{{0, 1},
262		{3, 4},
263		{0, 0},
264		{0, 0}
265		}
266	},
267	{0, 0, 1, 0,		/* 0x1c */
268		{{2, 4},
269		{0, 0},
270		{0, 0},
271		{0, 0}
272		}
273	},
274	{1, 0, 2, 0,		/* 0x1d */
275		{{0, 0},
276		{2, 4},
277		{0, 0},
278		{0, 0}
279		}
280	},
281	{0, 0, 1, 0,		/* 0x1e */
282		{{1, 4},
283		{0, 0},
284		{0, 0},
285		{0, 0}
286		}
287	},
288	{1, 0, 1, 0,		/* 0x1f */
289		{{0, 4},
290		{0, 0},
291		{0, 0},
292		{0, 0}
293		}
294	},
295	{0, 0, 1, 0,		/* 0x20 */
296		{{5, 5},
297		{0, 0},
298		{0, 0},
299		{0, 0}
300		}
301	},
302	{1, 0, 2, 0,		/* 0x21 */
303		{{0, 0},
304		{5, 5},
305		{0, 0},
306		{0, 0}
307		}
308	},
309	{0, 0, 2, 0,		/* 0x22 */
310		{{1, 1},
311		{5, 5},
312		{0, 0},
313		{0, 0}
314		}
315	},
316	{1, 0, 2, 0,		/* 0x23 */
317		{{0, 1},
318		{5, 5},
319		{0, 0},
320		{0, 0}
321		}
322	},
323	{0, 0, 2, 0,		/* 0x24 */
324		{{2, 2},
325		{5, 5},
326		{0, 0},
327		{0, 0}
328		}
329	},
330	{1, 0, 3, 0,		/* 0x25 */
331		{{0, 0},
332		{2, 2},
333		{5, 5},
334		{0, 0}
335		}
336	},
337	{0, 0, 2, 0,		/* 0x26 */
338		{{1, 2},
339		{5, 5},
340		{0, 0},
341		{0, 0}
342		}
343	},
344	{1, 0, 2, 0,		/* 0x27 */
345		{{0, 2},
346		{5, 5},
347		{0, 0},
348		{0, 0}
349		}
350	},
351	{0, 0, 2, 0,		/* 0x28 */
352		{{3, 3},
353		{5, 5},
354		{0, 0},
355		{0, 0}
356		}
357	},
358	{1, 0, 3, 0,		/* 0x29 */
359		{{0, 0},
360		{3, 3},
361		{5, 5},
362		{0, 0}
363		}
364	},
365	{0, 0, 3, 0,		/* 0x2a */
366		{{1, 1},
367		{3, 3},
368		{5, 5},
369		{0, 0}
370		}
371	},
372	{1, 0, 3, 0,		/* 0x2b */
373		{{0, 1},
374		{3, 3},
375		{5, 5},
376		{0, 0}
377		}
378	},
379	{0, 0, 2, 0,		/* 0x2c */
380		{{2, 3},
381		{5, 5},
382		{0, 0},
383		{0, 0}
384		}
385	},
386	{1, 0, 3, 0,		/* 0x2d */
387		{{0, 0},
388		{2, 3},
389		{5, 5},
390		{0, 0}
391		}
392	},
393	{0, 0, 2, 0,		/* 0x2e */
394		{{1, 3},
395		{5, 5},
396		{0, 0},
397		{0, 0}
398		}
399	},
400	{1, 0, 2, 0,		/* 0x2f */
401		{{0, 3},
402		{5, 5},
403		{0, 0},
404		{0, 0}
405		}
406	},
407	{0, 0, 1, 0,		/* 0x30 */
408		{{4, 5},
409		{0, 0},
410		{0, 0},
411		{0, 0}
412		}
413	},
414	{1, 0, 2, 0,		/* 0x31 */
415		{{0, 0},
416		{4, 5},
417		{0, 0},
418		{0, 0}
419		}
420	},
421	{0, 0, 2, 0,		/* 0x32 */
422		{{1, 1},
423		{4, 5},
424		{0, 0},
425		{0, 0}
426		}
427	},
428	{1, 0, 2, 0,		/* 0x33 */
429		{{0, 1},
430		{4, 5},
431		{0, 0},
432		{0, 0}
433		}
434	},
435	{0, 0, 2, 0,		/* 0x34 */
436		{{2, 2},
437		{4, 5},
438		{0, 0},
439		{0, 0}
440		}
441	},
442	{1, 0, 3, 0,		/* 0x35 */
443		{{0, 0},
444		{2, 2},
445		{4, 5},
446		{0, 0}
447		}
448	},
449	{0, 0, 2, 0,		/* 0x36 */
450		{{1, 2},
451		{4, 5},
452		{0, 0},
453		{0, 0}
454		}
455	},
456	{1, 0, 2, 0,		/* 0x37 */
457		{{0, 2},
458		{4, 5},
459		{0, 0},
460		{0, 0}
461		}
462	},
463	{0, 0, 1, 0,		/* 0x38 */
464		{{3, 5},
465		{0, 0},
466		{0, 0},
467		{0, 0}
468		}
469	},
470	{1, 0, 2, 0,		/* 0x39 */
471		{{0, 0},
472		{3, 5},
473		{0, 0},
474		{0, 0}
475		}
476	},
477	{0, 0, 2, 0,		/* 0x3a */
478		{{1, 1},
479		{3, 5},
480		{0, 0},
481		{0, 0}
482		}
483	},
484	{1, 0, 2, 0,		/* 0x3b */
485		{{0, 1},
486		{3, 5},
487		{0, 0},
488		{0, 0}
489		}
490	},
491	{0, 0, 1, 0,		/* 0x3c */
492		{{2, 5},
493		{0, 0},
494		{0, 0},
495		{0, 0}
496		}
497	},
498	{1, 0, 2, 0,		/* 0x3d */
499		{{0, 0},
500		{2, 5},
501		{0, 0},
502		{0, 0}
503		}
504	},
505	{0, 0, 1, 0,		/* 0x3e */
506		{{1, 5},
507		{0, 0},
508		{0, 0},
509		{0, 0}
510		}
511	},
512	{1, 0, 1, 0,		/* 0x3f */
513		{{0, 5},
514		{0, 0},
515		{0, 0},
516		{0, 0}
517		}
518	},
519	{0, 0, 1, 0,		/* 0x40 */
520		{{6, 6},
521		{0, 0},
522		{0, 0},
523		{0, 0}
524		}
525	},
526	{1, 0, 2, 0,		/* 0x41 */
527		{{0, 0},
528		{6, 6},
529		{0, 0},
530		{0, 0}
531		}
532	},
533	{0, 0, 2, 0,		/* 0x42 */
534		{{1, 1},
535		{6, 6},
536		{0, 0},
537		{0, 0}
538		}
539	},
540	{1, 0, 2, 0,		/* 0x43 */
541		{{0, 1},
542		{6, 6},
543		{0, 0},
544		{0, 0}
545		}
546	},
547	{0, 0, 2, 0,		/* 0x44 */
548		{{2, 2},
549		{6, 6},
550		{0, 0},
551		{0, 0}
552		}
553	},
554	{1, 0, 3, 0,		/* 0x45 */
555		{{0, 0},
556		{2, 2},
557		{6, 6},
558		{0, 0}
559		}
560	},
561	{0, 0, 2, 0,		/* 0x46 */
562		{{1, 2},
563		{6, 6},
564		{0, 0},
565		{0, 0}
566		}
567	},
568	{1, 0, 2, 0,		/* 0x47 */
569		{{0, 2},
570		{6, 6},
571		{0, 0},
572		{0, 0}
573		}
574	},
575	{0, 0, 2, 0,		/* 0x48 */
576		{{3, 3},
577		{6, 6},
578		{0, 0},
579		{0, 0}
580		}
581	},
582	{1, 0, 3, 0,		/* 0x49 */
583		{{0, 0},
584		{3, 3},
585		{6, 6},
586		{0, 0}
587		}
588	},
589	{0, 0, 3, 0,		/* 0x4a */
590		{{1, 1},
591		{3, 3},
592		{6, 6},
593		{0, 0}
594		}
595	},
596	{1, 0, 3, 0,		/* 0x4b */
597		{{0, 1},
598		{3, 3},
599		{6, 6},
600		{0, 0}
601		}
602	},
603	{0, 0, 2, 0,		/* 0x4c */
604		{{2, 3},
605		{6, 6},
606		{0, 0},
607		{0, 0}
608		}
609	},
610	{1, 0, 3, 0,		/* 0x4d */
611		{{0, 0},
612		{2, 3},
613		{6, 6},
614		{0, 0}
615		}
616	},
617	{0, 0, 2, 0,		/* 0x4e */
618		{{1, 3},
619		{6, 6},
620		{0, 0},
621		{0, 0}
622		}
623	},
624	{1, 0, 2, 0,		/* 0x4f */
625		{{0, 3},
626		{6, 6},
627		{0, 0},
628		{0, 0}
629		}
630	},
631	{0, 0, 2, 0,		/* 0x50 */
632		{{4, 4},
633		{6, 6},
634		{0, 0},
635		{0, 0}
636		}
637	},
638	{1, 0, 3, 0,		/* 0x51 */
639		{{0, 0},
640		{4, 4},
641		{6, 6},
642		{0, 0}
643		}
644	},
645	{0, 0, 3, 0,		/* 0x52 */
646		{{1, 1},
647		{4, 4},
648		{6, 6},
649		{0, 0}
650		}
651	},
652	{1, 0, 3, 0,		/* 0x53 */
653		{{0, 1},
654		{4, 4},
655		{6, 6},
656		{0, 0}
657		}
658	},
659	{0, 0, 3, 0,		/* 0x54 */
660		{{2, 2},
661		{4, 4},
662		{6, 6},
663		{0, 0}
664		}
665	},
666	{1, 0, 4, 0,		/* 0x55 */
667		{{0, 0},
668		{2, 2},
669		{4, 4},
670		{6, 6}
671		}
672	},
673	{0, 0, 3, 0,		/* 0x56 */
674		{{1, 2},
675		{4, 4},
676		{6, 6},
677		{0, 0}
678		}
679	},
680	{1, 0, 3, 0,		/* 0x57 */
681		{{0, 2},
682		{4, 4},
683		{6, 6},
684		{0, 0}
685		}
686	},
687	{0, 0, 2, 0,		/* 0x58 */
688		{{3, 4},
689		{6, 6},
690		{0, 0},
691		{0, 0}
692		}
693	},
694	{1, 0, 3, 0,		/* 0x59 */
695		{{0, 0},
696		{3, 4},
697		{6, 6},
698		{0, 0}
699		}
700	},
701	{0, 0, 3, 0,		/* 0x5a */
702		{{1, 1},
703		{3, 4},
704		{6, 6},
705		{0, 0}
706		}
707	},
708	{1, 0, 3, 0,		/* 0x5b */
709		{{0, 1},
710		{3, 4},
711		{6, 6},
712		{0, 0}
713		}
714	},
715	{0, 0, 2, 0,		/* 0x5c */
716		{{2, 4},
717		{6, 6},
718		{0, 0},
719		{0, 0}
720		}
721	},
722	{1, 0, 3, 0,		/* 0x5d */
723		{{0, 0},
724		{2, 4},
725		{6, 6},
726		{0, 0}
727		}
728	},
729	{0, 0, 2, 0,		/* 0x5e */
730		{{1, 4},
731		{6, 6},
732		{0, 0},
733		{0, 0}
734		}
735	},
736	{1, 0, 2, 0,		/* 0x5f */
737		{{0, 4},
738		{6, 6},
739		{0, 0},
740		{0, 0}
741		}
742	},
743	{0, 0, 1, 0,		/* 0x60 */
744		{{5, 6},
745		{0, 0},
746		{0, 0},
747		{0, 0}
748		}
749	},
750	{1, 0, 2, 0,		/* 0x61 */
751		{{0, 0},
752		{5, 6},
753		{0, 0},
754		{0, 0}
755		}
756	},
757	{0, 0, 2, 0,		/* 0x62 */
758		{{1, 1},
759		{5, 6},
760		{0, 0},
761		{0, 0}
762		}
763	},
764	{1, 0, 2, 0,		/* 0x63 */
765		{{0, 1},
766		{5, 6},
767		{0, 0},
768		{0, 0}
769		}
770	},
771	{0, 0, 2, 0,		/* 0x64 */
772		{{2, 2},
773		{5, 6},
774		{0, 0},
775		{0, 0}
776		}
777	},
778	{1, 0, 3, 0,		/* 0x65 */
779		{{0, 0},
780		{2, 2},
781		{5, 6},
782		{0, 0}
783		}
784	},
785	{0, 0, 2, 0,		/* 0x66 */
786		{{1, 2},
787		{5, 6},
788		{0, 0},
789		{0, 0}
790		}
791	},
792	{1, 0, 2, 0,		/* 0x67 */
793		{{0, 2},
794		{5, 6},
795		{0, 0},
796		{0, 0}
797		}
798	},
799	{0, 0, 2, 0,		/* 0x68 */
800		{{3, 3},
801		{5, 6},
802		{0, 0},
803		{0, 0}
804		}
805	},
806	{1, 0, 3, 0,		/* 0x69 */
807		{{0, 0},
808		{3, 3},
809		{5, 6},
810		{0, 0}
811		}
812	},
813	{0, 0, 3, 0,		/* 0x6a */
814		{{1, 1},
815		{3, 3},
816		{5, 6},
817		{0, 0}
818		}
819	},
820	{1, 0, 3, 0,		/* 0x6b */
821		{{0, 1},
822		{3, 3},
823		{5, 6},
824		{0, 0}
825		}
826	},
827	{0, 0, 2, 0,		/* 0x6c */
828		{{2, 3},
829		{5, 6},
830		{0, 0},
831		{0, 0}
832		}
833	},
834	{1, 0, 3, 0,		/* 0x6d */
835		{{0, 0},
836		{2, 3},
837		{5, 6},
838		{0, 0}
839		}
840	},
841	{0, 0, 2, 0,		/* 0x6e */
842		{{1, 3},
843		{5, 6},
844		{0, 0},
845		{0, 0}
846		}
847	},
848	{1, 0, 2, 0,		/* 0x6f */
849		{{0, 3},
850		{5, 6},
851		{0, 0},
852		{0, 0}
853		}
854	},
855	{0, 0, 1, 0,		/* 0x70 */
856		{{4, 6},
857		{0, 0},
858		{0, 0},
859		{0, 0}
860		}
861	},
862	{1, 0, 2, 0,		/* 0x71 */
863		{{0, 0},
864		{4, 6},
865		{0, 0},
866		{0, 0}
867		}
868	},
869	{0, 0, 2, 0,		/* 0x72 */
870		{{1, 1},
871		{4, 6},
872		{0, 0},
873		{0, 0}
874		}
875	},
876	{1, 0, 2, 0,		/* 0x73 */
877		{{0, 1},
878		{4, 6},
879		{0, 0},
880		{0, 0}
881		}
882	},
883	{0, 0, 2, 0,		/* 0x74 */
884		{{2, 2},
885		{4, 6},
886		{0, 0},
887		{0, 0}
888		}
889	},
890	{1, 0, 3, 0,		/* 0x75 */
891		{{0, 0},
892		{2, 2},
893		{4, 6},
894		{0, 0}
895		}
896	},
897	{0, 0, 2, 0,		/* 0x76 */
898		{{1, 2},
899		{4, 6},
900		{0, 0},
901		{0, 0}
902		}
903	},
904	{1, 0, 2, 0,		/* 0x77 */
905		{{0, 2},
906		{4, 6},
907		{0, 0},
908		{0, 0}
909		}
910	},
911	{0, 0, 1, 0,		/* 0x78 */
912		{{3, 6},
913		{0, 0},
914		{0, 0},
915		{0, 0}
916		}
917	},
918	{1, 0, 2, 0,		/* 0x79 */
919		{{0, 0},
920		{3, 6},
921		{0, 0},
922		{0, 0}
923		}
924	},
925	{0, 0, 2, 0,		/* 0x7a */
926		{{1, 1},
927		{3, 6},
928		{0, 0},
929		{0, 0}
930		}
931	},
932	{1, 0, 2, 0,		/* 0x7b */
933		{{0, 1},
934		{3, 6},
935		{0, 0},
936		{0, 0}
937		}
938	},
939	{0, 0, 1, 0,		/* 0x7c */
940		{{2, 6},
941		{0, 0},
942		{0, 0},
943		{0, 0}
944		}
945	},
946	{1, 0, 2, 0,		/* 0x7d */
947		{{0, 0},
948		{2, 6},
949		{0, 0},
950		{0, 0}
951		}
952	},
953	{0, 0, 1, 0,		/* 0x7e */
954		{{1, 6},
955		{0, 0},
956		{0, 0},
957		{0, 0}
958		}
959	},
960	{1, 0, 1, 0,		/* 0x7f */
961		{{0, 6},
962		{0, 0},
963		{0, 0},
964		{0, 0}
965		}
966	},
967	{0, 1, 1, 0,		/* 0x80 */
968		{{7, 7},
969		{0, 0},
970		{0, 0},
971		{0, 0}
972		}
973	},
974	{1, 1, 2, 0,		/* 0x81 */
975		{{0, 0},
976		{7, 7},
977		{0, 0},
978		{0, 0}
979		}
980	},
981	{0, 1, 2, 0,		/* 0x82 */
982		{{1, 1},
983		{7, 7},
984		{0, 0},
985		{0, 0}
986		}
987	},
988	{1, 1, 2, 0,		/* 0x83 */
989		{{0, 1},
990		{7, 7},
991		{0, 0},
992		{0, 0}
993		}
994	},
995	{0, 1, 2, 0,		/* 0x84 */
996		{{2, 2},
997		{7, 7},
998		{0, 0},
999		{0, 0}
1000		}
1001	},
1002	{1, 1, 3, 0,		/* 0x85 */
1003		{{0, 0},
1004		{2, 2},
1005		{7, 7},
1006		{0, 0}
1007		}
1008	},
1009	{0, 1, 2, 0,		/* 0x86 */
1010		{{1, 2},
1011		{7, 7},
1012		{0, 0},
1013		{0, 0}
1014		}
1015	},
1016	{1, 1, 2, 0,		/* 0x87 */
1017		{{0, 2},
1018		{7, 7},
1019		{0, 0},
1020		{0, 0}
1021		}
1022	},
1023	{0, 1, 2, 0,		/* 0x88 */
1024		{{3, 3},
1025		{7, 7},
1026		{0, 0},
1027		{0, 0}
1028		}
1029	},
1030	{1, 1, 3, 0,		/* 0x89 */
1031		{{0, 0},
1032		{3, 3},
1033		{7, 7},
1034		{0, 0}
1035		}
1036	},
1037	{0, 1, 3, 0,		/* 0x8a */
1038		{{1, 1},
1039		{3, 3},
1040		{7, 7},
1041		{0, 0}
1042		}
1043	},
1044	{1, 1, 3, 0,		/* 0x8b */
1045		{{0, 1},
1046		{3, 3},
1047		{7, 7},
1048		{0, 0}
1049		}
1050	},
1051	{0, 1, 2, 0,		/* 0x8c */
1052		{{2, 3},
1053		{7, 7},
1054		{0, 0},
1055		{0, 0}
1056		}
1057	},
1058	{1, 1, 3, 0,		/* 0x8d */
1059		{{0, 0},
1060		{2, 3},
1061		{7, 7},
1062		{0, 0}
1063		}
1064	},
1065	{0, 1, 2, 0,		/* 0x8e */
1066		{{1, 3},
1067		{7, 7},
1068		{0, 0},
1069		{0, 0}
1070		}
1071	},
1072	{1, 1, 2, 0,		/* 0x8f */
1073		{{0, 3},
1074		{7, 7},
1075		{0, 0},
1076		{0, 0}
1077		}
1078	},
1079	{0, 1, 2, 0,		/* 0x90 */
1080		{{4, 4},
1081		{7, 7},
1082		{0, 0},
1083		{0, 0}
1084		}
1085	},
1086	{1, 1, 3, 0,		/* 0x91 */
1087		{{0, 0},
1088		{4, 4},
1089		{7, 7},
1090		{0, 0}
1091		}
1092	},
1093	{0, 1, 3, 0,		/* 0x92 */
1094		{{1, 1},
1095		{4, 4},
1096		{7, 7},
1097		{0, 0}
1098		}
1099	},
1100	{1, 1, 3, 0,		/* 0x93 */
1101		{{0, 1},
1102		{4, 4},
1103		{7, 7},
1104		{0, 0}
1105		}
1106	},
1107	{0, 1, 3, 0,		/* 0x94 */
1108		{{2, 2},
1109		{4, 4},
1110		{7, 7},
1111		{0, 0}
1112		}
1113	},
1114	{1, 1, 4, 0,		/* 0x95 */
1115		{{0, 0},
1116		{2, 2},
1117		{4, 4},
1118		{7, 7}
1119		}
1120	},
1121	{0, 1, 3, 0,		/* 0x96 */
1122		{{1, 2},
1123		{4, 4},
1124		{7, 7},
1125		{0, 0}
1126		}
1127	},
1128	{1, 1, 3, 0,		/* 0x97 */
1129		{{0, 2},
1130		{4, 4},
1131		{7, 7},
1132		{0, 0}
1133		}
1134	},
1135	{0, 1, 2, 0,		/* 0x98 */
1136		{{3, 4},
1137		{7, 7},
1138		{0, 0},
1139		{0, 0}
1140		}
1141	},
1142	{1, 1, 3, 0,		/* 0x99 */
1143		{{0, 0},
1144		{3, 4},
1145		{7, 7},
1146		{0, 0}
1147		}
1148	},
1149	{0, 1, 3, 0,		/* 0x9a */
1150		{{1, 1},
1151		{3, 4},
1152		{7, 7},
1153		{0, 0}
1154		}
1155	},
1156	{1, 1, 3, 0,		/* 0x9b */
1157		{{0, 1},
1158		{3, 4},
1159		{7, 7},
1160		{0, 0}
1161		}
1162	},
1163	{0, 1, 2, 0,		/* 0x9c */
1164		{{2, 4},
1165		{7, 7},
1166		{0, 0},
1167		{0, 0}
1168		}
1169	},
1170	{1, 1, 3, 0,		/* 0x9d */
1171		{{0, 0},
1172		{2, 4},
1173		{7, 7},
1174		{0, 0}
1175		}
1176	},
1177	{0, 1, 2, 0,		/* 0x9e */
1178		{{1, 4},
1179		{7, 7},
1180		{0, 0},
1181		{0, 0}
1182		}
1183	},
1184	{1, 1, 2, 0,		/* 0x9f */
1185		{{0, 4},
1186		{7, 7},
1187		{0, 0},
1188		{0, 0}
1189		}
1190	},
1191	{0, 1, 2, 0,		/* 0xa0 */
1192		{{5, 5},
1193		{7, 7},
1194		{0, 0},
1195		{0, 0}
1196		}
1197	},
1198	{1, 1, 3, 0,		/* 0xa1 */
1199		{{0, 0},
1200		{5, 5},
1201		{7, 7},
1202		{0, 0}
1203		}
1204	},
1205	{0, 1, 3, 0,		/* 0xa2 */
1206		{{1, 1},
1207		{5, 5},
1208		{7, 7},
1209		{0, 0}
1210		}
1211	},
1212	{1, 1, 3, 0,		/* 0xa3 */
1213		{{0, 1},
1214		{5, 5},
1215		{7, 7},
1216		{0, 0}
1217		}
1218	},
1219	{0, 1, 3, 0,		/* 0xa4 */
1220		{{2, 2},
1221		{5, 5},
1222		{7, 7},
1223		{0, 0}
1224		}
1225	},
1226	{1, 1, 4, 0,		/* 0xa5 */
1227		{{0, 0},
1228		{2, 2},
1229		{5, 5},
1230		{7, 7}
1231		}
1232	},
1233	{0, 1, 3, 0,		/* 0xa6 */
1234		{{1, 2},
1235		{5, 5},
1236		{7, 7},
1237		{0, 0}
1238		}
1239	},
1240	{1, 1, 3, 0,		/* 0xa7 */
1241		{{0, 2},
1242		{5, 5},
1243		{7, 7},
1244		{0, 0}
1245		}
1246	},
1247	{0, 1, 3, 0,		/* 0xa8 */
1248		{{3, 3},
1249		{5, 5},
1250		{7, 7},
1251		{0, 0}
1252		}
1253	},
1254	{1, 1, 4, 0,		/* 0xa9 */
1255		{{0, 0},
1256		{3, 3},
1257		{5, 5},
1258		{7, 7}
1259		}
1260	},
1261	{0, 1, 4, 0,		/* 0xaa */
1262		{{1, 1},
1263		{3, 3},
1264		{5, 5},
1265		{7, 7}
1266		}
1267	},
1268	{1, 1, 4, 0,		/* 0xab */
1269		{{0, 1},
1270		{3, 3},
1271		{5, 5},
1272		{7, 7}
1273		}
1274	},
1275	{0, 1, 3, 0,		/* 0xac */
1276		{{2, 3},
1277		{5, 5},
1278		{7, 7},
1279		{0, 0}
1280		}
1281	},
1282	{1, 1, 4, 0,		/* 0xad */
1283		{{0, 0},
1284		{2, 3},
1285		{5, 5},
1286		{7, 7}
1287		}
1288	},
1289	{0, 1, 3, 0,		/* 0xae */
1290		{{1, 3},
1291		{5, 5},
1292		{7, 7},
1293		{0, 0}
1294		}
1295	},
1296	{1, 1, 3, 0,		/* 0xaf */
1297		{{0, 3},
1298		{5, 5},
1299		{7, 7},
1300		{0, 0}
1301		}
1302	},
1303	{0, 1, 2, 0,		/* 0xb0 */
1304		{{4, 5},
1305		{7, 7},
1306		{0, 0},
1307		{0, 0}
1308		}
1309	},
1310	{1, 1, 3, 0,		/* 0xb1 */
1311		{{0, 0},
1312		{4, 5},
1313		{7, 7},
1314		{0, 0}
1315		}
1316	},
1317	{0, 1, 3, 0,		/* 0xb2 */
1318		{{1, 1},
1319		{4, 5},
1320		{7, 7},
1321		{0, 0}
1322		}
1323	},
1324	{1, 1, 3, 0,		/* 0xb3 */
1325		{{0, 1},
1326		{4, 5},
1327		{7, 7},
1328		{0, 0}
1329		}
1330	},
1331	{0, 1, 3, 0,		/* 0xb4 */
1332		{{2, 2},
1333		{4, 5},
1334		{7, 7},
1335		{0, 0}
1336		}
1337	},
1338	{1, 1, 4, 0,		/* 0xb5 */
1339		{{0, 0},
1340		{2, 2},
1341		{4, 5},
1342		{7, 7}
1343		}
1344	},
1345	{0, 1, 3, 0,		/* 0xb6 */
1346		{{1, 2},
1347		{4, 5},
1348		{7, 7},
1349		{0, 0}
1350		}
1351	},
1352	{1, 1, 3, 0,		/* 0xb7 */
1353		{{0, 2},
1354		{4, 5},
1355		{7, 7},
1356		{0, 0}
1357		}
1358	},
1359	{0, 1, 2, 0,		/* 0xb8 */
1360		{{3, 5},
1361		{7, 7},
1362		{0, 0},
1363		{0, 0}
1364		}
1365	},
1366	{1, 1, 3, 0,		/* 0xb9 */
1367		{{0, 0},
1368		{3, 5},
1369		{7, 7},
1370		{0, 0}
1371		}
1372	},
1373	{0, 1, 3, 0,		/* 0xba */
1374		{{1, 1},
1375		{3, 5},
1376		{7, 7},
1377		{0, 0}
1378		}
1379	},
1380	{1, 1, 3, 0,		/* 0xbb */
1381		{{0, 1},
1382		{3, 5},
1383		{7, 7},
1384		{0, 0}
1385		}
1386	},
1387	{0, 1, 2, 0,		/* 0xbc */
1388		{{2, 5},
1389		{7, 7},
1390		{0, 0},
1391		{0, 0}
1392		}
1393	},
1394	{1, 1, 3, 0,		/* 0xbd */
1395		{{0, 0},
1396		{2, 5},
1397		{7, 7},
1398		{0, 0}
1399		}
1400	},
1401	{0, 1, 2, 0,		/* 0xbe */
1402		{{1, 5},
1403		{7, 7},
1404		{0, 0},
1405		{0, 0}
1406		}
1407	},
1408	{1, 1, 2, 0,		/* 0xbf */
1409		{{0, 5},
1410		{7, 7},
1411		{0, 0},
1412		{0, 0}
1413		}
1414	},
1415	{0, 1, 1, 0,		/* 0xc0 */
1416		{{6, 7},
1417		{0, 0},
1418		{0, 0},
1419		{0, 0}
1420		}
1421	},
1422	{1, 1, 2, 0,		/* 0xc1 */
1423		{{0, 0},
1424		{6, 7},
1425		{0, 0},
1426		{0, 0}
1427		}
1428	},
1429	{0, 1, 2, 0,		/* 0xc2 */
1430		{{1, 1},
1431		{6, 7},
1432		{0, 0},
1433		{0, 0}
1434		}
1435	},
1436	{1, 1, 2, 0,		/* 0xc3 */
1437		{{0, 1},
1438		{6, 7},
1439		{0, 0},
1440		{0, 0}
1441		}
1442	},
1443	{0, 1, 2, 0,		/* 0xc4 */
1444		{{2, 2},
1445		{6, 7},
1446		{0, 0},
1447		{0, 0}
1448		}
1449	},
1450	{1, 1, 3, 0,		/* 0xc5 */
1451		{{0, 0},
1452		{2, 2},
1453		{6, 7},
1454		{0, 0}
1455		}
1456	},
1457	{0, 1, 2, 0,		/* 0xc6 */
1458		{{1, 2},
1459		{6, 7},
1460		{0, 0},
1461		{0, 0}
1462		}
1463	},
1464	{1, 1, 2, 0,		/* 0xc7 */
1465		{{0, 2},
1466		{6, 7},
1467		{0, 0},
1468		{0, 0}
1469		}
1470	},
1471	{0, 1, 2, 0,		/* 0xc8 */
1472		{{3, 3},
1473		{6, 7},
1474		{0, 0},
1475		{0, 0}
1476		}
1477	},
1478	{1, 1, 3, 0,		/* 0xc9 */
1479		{{0, 0},
1480		{3, 3},
1481		{6, 7},
1482		{0, 0}
1483		}
1484	},
1485	{0, 1, 3, 0,		/* 0xca */
1486		{{1, 1},
1487		{3, 3},
1488		{6, 7},
1489		{0, 0}
1490		}
1491	},
1492	{1, 1, 3, 0,		/* 0xcb */
1493		{{0, 1},
1494		{3, 3},
1495		{6, 7},
1496		{0, 0}
1497		}
1498	},
1499	{0, 1, 2, 0,		/* 0xcc */
1500		{{2, 3},
1501		{6, 7},
1502		{0, 0},
1503		{0, 0}
1504		}
1505	},
1506	{1, 1, 3, 0,		/* 0xcd */
1507		{{0, 0},
1508		{2, 3},
1509		{6, 7},
1510		{0, 0}
1511		}
1512	},
1513	{0, 1, 2, 0,		/* 0xce */
1514		{{1, 3},
1515		{6, 7},
1516		{0, 0},
1517		{0, 0}
1518		}
1519	},
1520	{1, 1, 2, 0,		/* 0xcf */
1521		{{0, 3},
1522		{6, 7},
1523		{0, 0},
1524		{0, 0}
1525		}
1526	},
1527	{0, 1, 2, 0,		/* 0xd0 */
1528		{{4, 4},
1529		{6, 7},
1530		{0, 0},
1531		{0, 0}
1532		}
1533	},
1534	{1, 1, 3, 0,		/* 0xd1 */
1535		{{0, 0},
1536		{4, 4},
1537		{6, 7},
1538		{0, 0}
1539		}
1540	},
1541	{0, 1, 3, 0,		/* 0xd2 */
1542		{{1, 1},
1543		{4, 4},
1544		{6, 7},
1545		{0, 0}
1546		}
1547	},
1548	{1, 1, 3, 0,		/* 0xd3 */
1549		{{0, 1},
1550		{4, 4},
1551		{6, 7},
1552		{0, 0}
1553		}
1554	},
1555	{0, 1, 3, 0,		/* 0xd4 */
1556		{{2, 2},
1557		{4, 4},
1558		{6, 7},
1559		{0, 0}
1560		}
1561	},
1562	{1, 1, 4, 0,		/* 0xd5 */
1563		{{0, 0},
1564		{2, 2},
1565		{4, 4},
1566		{6, 7}
1567		}
1568	},
1569	{0, 1, 3, 0,		/* 0xd6 */
1570		{{1, 2},
1571		{4, 4},
1572		{6, 7},
1573		{0, 0}
1574		}
1575	},
1576	{1, 1, 3, 0,		/* 0xd7 */
1577		{{0, 2},
1578		{4, 4},
1579		{6, 7},
1580		{0, 0}
1581		}
1582	},
1583	{0, 1, 2, 0,		/* 0xd8 */
1584		{{3, 4},
1585		{6, 7},
1586		{0, 0},
1587		{0, 0}
1588		}
1589	},
1590	{1, 1, 3, 0,		/* 0xd9 */
1591		{{0, 0},
1592		{3, 4},
1593		{6, 7},
1594		{0, 0}
1595		}
1596	},
1597	{0, 1, 3, 0,		/* 0xda */
1598		{{1, 1},
1599		{3, 4},
1600		{6, 7},
1601		{0, 0}
1602		}
1603	},
1604	{1, 1, 3, 0,		/* 0xdb */
1605		{{0, 1},
1606		{3, 4},
1607		{6, 7},
1608		{0, 0}
1609		}
1610	},
1611	{0, 1, 2, 0,		/* 0xdc */
1612		{{2, 4},
1613		{6, 7},
1614		{0, 0},
1615		{0, 0}
1616		}
1617	},
1618	{1, 1, 3, 0,		/* 0xdd */
1619		{{0, 0},
1620		{2, 4},
1621		{6, 7},
1622		{0, 0}
1623		}
1624	},
1625	{0, 1, 2, 0,		/* 0xde */
1626		{{1, 4},
1627		{6, 7},
1628		{0, 0},
1629		{0, 0}
1630		}
1631	},
1632	{1, 1, 2, 0,		/* 0xdf */
1633		{{0, 4},
1634		{6, 7},
1635		{0, 0},
1636		{0, 0}
1637		}
1638	},
1639	{0, 1, 1, 0,		/* 0xe0 */
1640		{{5, 7},
1641		{0, 0},
1642		{0, 0},
1643		{0, 0}
1644		}
1645	},
1646	{1, 1, 2, 0,		/* 0xe1 */
1647		{{0, 0},
1648		{5, 7},
1649		{0, 0},
1650		{0, 0}
1651		}
1652	},
1653	{0, 1, 2, 0,		/* 0xe2 */
1654		{{1, 1},
1655		{5, 7},
1656		{0, 0},
1657		{0, 0}
1658		}
1659	},
1660	{1, 1, 2, 0,		/* 0xe3 */
1661		{{0, 1},
1662		{5, 7},
1663		{0, 0},
1664		{0, 0}
1665		}
1666	},
1667	{0, 1, 2, 0,		/* 0xe4 */
1668		{{2, 2},
1669		{5, 7},
1670		{0, 0},
1671		{0, 0}
1672		}
1673	},
1674	{1, 1, 3, 0,		/* 0xe5 */
1675		{{0, 0},
1676		{2, 2},
1677		{5, 7},
1678		{0, 0}
1679		}
1680	},
1681	{0, 1, 2, 0,		/* 0xe6 */
1682		{{1, 2},
1683		{5, 7},
1684		{0, 0},
1685		{0, 0}
1686		}
1687	},
1688	{1, 1, 2, 0,		/* 0xe7 */
1689		{{0, 2},
1690		{5, 7},
1691		{0, 0},
1692		{0, 0}
1693		}
1694	},
1695	{0, 1, 2, 0,		/* 0xe8 */
1696		{{3, 3},
1697		{5, 7},
1698		{0, 0},
1699		{0, 0}
1700		}
1701	},
1702	{1, 1, 3, 0,		/* 0xe9 */
1703		{{0, 0},
1704		{3, 3},
1705		{5, 7},
1706		{0, 0}
1707		}
1708	},
1709	{0, 1, 3, 0,		/* 0xea */
1710		{{1, 1},
1711		{3, 3},
1712		{5, 7},
1713		{0, 0}
1714		}
1715	},
1716	{1, 1, 3, 0,		/* 0xeb */
1717		{{0, 1},
1718		{3, 3},
1719		{5, 7},
1720		{0, 0}
1721		}
1722	},
1723	{0, 1, 2, 0,		/* 0xec */
1724		{{2, 3},
1725		{5, 7},
1726		{0, 0},
1727		{0, 0}
1728		}
1729	},
1730	{1, 1, 3, 0,		/* 0xed */
1731		{{0, 0},
1732		{2, 3},
1733		{5, 7},
1734		{0, 0}
1735		}
1736	},
1737	{0, 1, 2, 0,		/* 0xee */
1738		{{1, 3},
1739		{5, 7},
1740		{0, 0},
1741		{0, 0}
1742		}
1743	},
1744	{1, 1, 2, 0,		/* 0xef */
1745		{{0, 3},
1746		{5, 7},
1747		{0, 0},
1748		{0, 0}
1749		}
1750	},
1751	{0, 1, 1, 0,		/* 0xf0 */
1752		{{4, 7},
1753		{0, 0},
1754		{0, 0},
1755		{0, 0}
1756		}
1757	},
1758	{1, 1, 2, 0,		/* 0xf1 */
1759		{{0, 0},
1760		{4, 7},
1761		{0, 0},
1762		{0, 0}
1763		}
1764	},
1765	{0, 1, 2, 0,		/* 0xf2 */
1766		{{1, 1},
1767		{4, 7},
1768		{0, 0},
1769		{0, 0}
1770		}
1771	},
1772	{1, 1, 2, 0,		/* 0xf3 */
1773		{{0, 1},
1774		{4, 7},
1775		{0, 0},
1776		{0, 0}
1777		}
1778	},
1779	{0, 1, 2, 0,		/* 0xf4 */
1780		{{2, 2},
1781		{4, 7},
1782		{0, 0},
1783		{0, 0}
1784		}
1785	},
1786	{1, 1, 3, 0,		/* 0xf5 */
1787		{{0, 0},
1788		{2, 2},
1789		{4, 7},
1790		{0, 0}
1791		}
1792	},
1793	{0, 1, 2, 0,		/* 0xf6 */
1794		{{1, 2},
1795		{4, 7},
1796		{0, 0},
1797		{0, 0}
1798		}
1799	},
1800	{1, 1, 2, 0,		/* 0xf7 */
1801		{{0, 2},
1802		{4, 7},
1803		{0, 0},
1804		{0, 0}
1805		}
1806	},
1807	{0, 1, 1, 0,		/* 0xf8 */
1808		{{3, 7},
1809		{0, 0},
1810		{0, 0},
1811		{0, 0}
1812		}
1813	},
1814	{1, 1, 2, 0,		/* 0xf9 */
1815		{{0, 0},
1816		{3, 7},
1817		{0, 0},
1818		{0, 0}
1819		}
1820	},
1821	{0, 1, 2, 0,		/* 0xfa */
1822		{{1, 1},
1823		{3, 7},
1824		{0, 0},
1825		{0, 0}
1826		}
1827	},
1828	{1, 1, 2, 0,		/* 0xfb */
1829		{{0, 1},
1830		{3, 7},
1831		{0, 0},
1832		{0, 0}
1833		}
1834	},
1835	{0, 1, 1, 0,		/* 0xfc */
1836		{{2, 7},
1837		{0, 0},
1838		{0, 0},
1839		{0, 0}
1840		}
1841	},
1842	{1, 1, 2, 0,		/* 0xfd */
1843		{{0, 0},
1844		{2, 7},
1845		{0, 0},
1846		{0, 0}
1847		}
1848	},
1849	{0, 1, 1, 0,		/* 0xfe */
1850		{{1, 7},
1851		{0, 0},
1852		{0, 0},
1853		{0, 0}
1854		}
1855	},
1856	{1, 1, 1, 0,		/* 0xff */
1857		{{0, 7},
1858		{0, 0},
1859		{0, 0},
1860		{0, 0}
1861		}
1862	}
1863};
1864
1865
1866int
1867sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868    struct sctp_scoping *scope,
1869    int do_update)
1870{
1871	if ((scope->loopback_scope == 0) &&
1872	    (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873		/*
1874		 * skip loopback if not in scope *
1875		 */
1876		return (0);
1877	}
1878	switch (ifa->address.sa.sa_family) {
1879#ifdef INET
1880	case AF_INET:
1881		if (scope->ipv4_addr_legal) {
1882			struct sockaddr_in *sin;
1883
1884			sin = &ifa->address.sin;
1885			if (sin->sin_addr.s_addr == 0) {
1886				/* not in scope , unspecified */
1887				return (0);
1888			}
1889			if ((scope->ipv4_local_scope == 0) &&
1890			    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891				/* private address not in scope */
1892				return (0);
1893			}
1894		} else {
1895			return (0);
1896		}
1897		break;
1898#endif
1899#ifdef INET6
1900	case AF_INET6:
1901		if (scope->ipv6_addr_legal) {
1902			struct sockaddr_in6 *sin6;
1903
1904			/*
1905			 * Must update the flags,  bummer, which means any
1906			 * IFA locks must now be applied HERE <->
1907			 */
1908			if (do_update) {
1909				sctp_gather_internal_ifa_flags(ifa);
1910			}
1911			if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912				return (0);
1913			}
1914			/* ok to use deprecated addresses? */
1915			sin6 = &ifa->address.sin6;
1916			if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917				/* skip unspecifed addresses */
1918				return (0);
1919			}
1920			if (	/* (local_scope == 0) && */
1921			    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922				return (0);
1923			}
1924			if ((scope->site_scope == 0) &&
1925			    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926				return (0);
1927			}
1928		} else {
1929			return (0);
1930		}
1931		break;
1932#endif
1933	default:
1934		return (0);
1935	}
1936	return (1);
1937}
1938
1939static struct mbuf *
1940sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1941{
1942#if defined(INET) || defined(INET6)
1943	struct sctp_paramhdr *paramh;
1944	struct mbuf *mret;
1945	uint16_t plen;
1946#endif
1947
1948	switch (ifa->address.sa.sa_family) {
1949#ifdef INET
1950	case AF_INET:
1951		plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952		break;
1953#endif
1954#ifdef INET6
1955	case AF_INET6:
1956		plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957		break;
1958#endif
1959	default:
1960		return (m);
1961	}
1962#if defined(INET) || defined(INET6)
1963	if (M_TRAILINGSPACE(m) >= plen) {
1964		/* easy side we just drop it on the end */
1965		paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966		mret = m;
1967	} else {
1968		/* Need more space */
1969		mret = m;
1970		while (SCTP_BUF_NEXT(mret) != NULL) {
1971			mret = SCTP_BUF_NEXT(mret);
1972		}
1973		SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974		if (SCTP_BUF_NEXT(mret) == NULL) {
1975			/* We are hosed, can't add more addresses */
1976			return (m);
1977		}
1978		mret = SCTP_BUF_NEXT(mret);
1979		paramh = mtod(mret, struct sctp_paramhdr *);
1980	}
1981	/* now add the parameter */
1982	switch (ifa->address.sa.sa_family) {
1983#ifdef INET
1984	case AF_INET:
1985		{
1986			struct sctp_ipv4addr_param *ipv4p;
1987			struct sockaddr_in *sin;
1988
1989			sin = &ifa->address.sin;
1990			ipv4p = (struct sctp_ipv4addr_param *)paramh;
1991			paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992			paramh->param_length = htons(plen);
1993			ipv4p->addr = sin->sin_addr.s_addr;
1994			SCTP_BUF_LEN(mret) += plen;
1995			break;
1996		}
1997#endif
1998#ifdef INET6
1999	case AF_INET6:
2000		{
2001			struct sctp_ipv6addr_param *ipv6p;
2002			struct sockaddr_in6 *sin6;
2003
2004			sin6 = &ifa->address.sin6;
2005			ipv6p = (struct sctp_ipv6addr_param *)paramh;
2006			paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007			paramh->param_length = htons(plen);
2008			memcpy(ipv6p->addr, &sin6->sin6_addr,
2009			    sizeof(ipv6p->addr));
2010			/* clear embedded scope in the address */
2011			in6_clearscope((struct in6_addr *)ipv6p->addr);
2012			SCTP_BUF_LEN(mret) += plen;
2013			break;
2014		}
2015#endif
2016	default:
2017		return (m);
2018	}
2019	if (len != NULL) {
2020		*len += plen;
2021	}
2022	return (mret);
2023#endif
2024}
2025
2026
2027struct mbuf *
2028sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029    struct sctp_scoping *scope,
2030    struct mbuf *m_at, int cnt_inits_to,
2031    uint16_t *padding_len, uint16_t *chunk_len)
2032{
2033	struct sctp_vrf *vrf = NULL;
2034	int cnt, limit_out = 0, total_count;
2035	uint32_t vrf_id;
2036
2037	vrf_id = inp->def_vrf_id;
2038	SCTP_IPI_ADDR_RLOCK();
2039	vrf = sctp_find_vrf(vrf_id);
2040	if (vrf == NULL) {
2041		SCTP_IPI_ADDR_RUNLOCK();
2042		return (m_at);
2043	}
2044	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045		struct sctp_ifa *sctp_ifap;
2046		struct sctp_ifn *sctp_ifnp;
2047
2048		cnt = cnt_inits_to;
2049		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050			limit_out = 1;
2051			cnt = SCTP_ADDRESS_LIMIT;
2052			goto skip_count;
2053		}
2054		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055			if ((scope->loopback_scope == 0) &&
2056			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057				/*
2058				 * Skip loopback devices if loopback_scope
2059				 * not set
2060				 */
2061				continue;
2062			}
2063			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064#ifdef INET
2065				if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067				    &sctp_ifap->address.sin.sin_addr) != 0)) {
2068					continue;
2069				}
2070#endif
2071#ifdef INET6
2072				if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074				    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075					continue;
2076				}
2077#endif
2078				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079					continue;
2080				}
2081				if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082					continue;
2083				}
2084				cnt++;
2085				if (cnt > SCTP_ADDRESS_LIMIT) {
2086					break;
2087				}
2088			}
2089			if (cnt > SCTP_ADDRESS_LIMIT) {
2090				break;
2091			}
2092		}
2093skip_count:
2094		if (cnt > 1) {
2095			total_count = 0;
2096			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097				cnt = 0;
2098				if ((scope->loopback_scope == 0) &&
2099				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100					/*
2101					 * Skip loopback devices if
2102					 * loopback_scope not set
2103					 */
2104					continue;
2105				}
2106				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107#ifdef INET
2108					if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110					    &sctp_ifap->address.sin.sin_addr) != 0)) {
2111						continue;
2112					}
2113#endif
2114#ifdef INET6
2115					if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117					    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118						continue;
2119					}
2120#endif
2121					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122						continue;
2123					}
2124					if (sctp_is_address_in_scope(sctp_ifap,
2125					    scope, 0) == 0) {
2126						continue;
2127					}
2128					if ((chunk_len != NULL) &&
2129					    (padding_len != NULL) &&
2130					    (*padding_len > 0)) {
2131						memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132						SCTP_BUF_LEN(m_at) += *padding_len;
2133						*chunk_len += *padding_len;
2134						*padding_len = 0;
2135					}
2136					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137					if (limit_out) {
2138						cnt++;
2139						total_count++;
2140						if (cnt >= 2) {
2141							/*
2142							 * two from each
2143							 * address
2144							 */
2145							break;
2146						}
2147						if (total_count > SCTP_ADDRESS_LIMIT) {
2148							/* No more addresses */
2149							break;
2150						}
2151					}
2152				}
2153			}
2154		}
2155	} else {
2156		struct sctp_laddr *laddr;
2157
2158		cnt = cnt_inits_to;
2159		/* First, how many ? */
2160		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2161			if (laddr->ifa == NULL) {
2162				continue;
2163			}
2164			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2165				/*
2166				 * Address being deleted by the system, dont
2167				 * list.
2168				 */
2169				continue;
2170			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2171				/*
2172				 * Address being deleted on this ep don't
2173				 * list.
2174				 */
2175				continue;
2176			}
2177			if (sctp_is_address_in_scope(laddr->ifa,
2178			    scope, 1) == 0) {
2179				continue;
2180			}
2181			cnt++;
2182		}
2183		/*
2184		 * To get through a NAT we only list addresses if we have
2185		 * more than one. That way if you just bind a single address
2186		 * we let the source of the init dictate our address.
2187		 */
2188		if (cnt > 1) {
2189			cnt = cnt_inits_to;
2190			LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2191				if (laddr->ifa == NULL) {
2192					continue;
2193				}
2194				if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2195					continue;
2196				}
2197				if (sctp_is_address_in_scope(laddr->ifa,
2198				    scope, 0) == 0) {
2199					continue;
2200				}
2201				if ((chunk_len != NULL) &&
2202				    (padding_len != NULL) &&
2203				    (*padding_len > 0)) {
2204					memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2205					SCTP_BUF_LEN(m_at) += *padding_len;
2206					*chunk_len += *padding_len;
2207					*padding_len = 0;
2208				}
2209				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2210				cnt++;
2211				if (cnt >= SCTP_ADDRESS_LIMIT) {
2212					break;
2213				}
2214			}
2215		}
2216	}
2217	SCTP_IPI_ADDR_RUNLOCK();
2218	return (m_at);
2219}
2220
2221static struct sctp_ifa *
2222sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2223    uint8_t dest_is_loop,
2224    uint8_t dest_is_priv,
2225    sa_family_t fam)
2226{
2227	uint8_t dest_is_global = 0;
2228
2229	/* dest_is_priv is true if destination is a private address */
2230	/* dest_is_loop is true if destination is a loopback addresses */
2231
2232	/**
2233	 * Here we determine if its a preferred address. A preferred address
2234	 * means it is the same scope or higher scope then the destination.
2235	 * L = loopback, P = private, G = global
2236	 * -----------------------------------------
2237	 *    src    |  dest | result
2238	 *  ----------------------------------------
2239	 *     L     |    L  |    yes
2240	 *  -----------------------------------------
2241	 *     P     |    L  |    yes-v4 no-v6
2242	 *  -----------------------------------------
2243	 *     G     |    L  |    yes-v4 no-v6
2244	 *  -----------------------------------------
2245	 *     L     |    P  |    no
2246	 *  -----------------------------------------
2247	 *     P     |    P  |    yes
2248	 *  -----------------------------------------
2249	 *     G     |    P  |    no
2250	 *   -----------------------------------------
2251	 *     L     |    G  |    no
2252	 *   -----------------------------------------
2253	 *     P     |    G  |    no
2254	 *    -----------------------------------------
2255	 *     G     |    G  |    yes
2256	 *    -----------------------------------------
2257	 */
2258
2259	if (ifa->address.sa.sa_family != fam) {
2260		/* forget mis-matched family */
2261		return (NULL);
2262	}
2263	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2264		dest_is_global = 1;
2265	}
2266	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2267	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2268	/* Ok the address may be ok */
2269#ifdef INET6
2270	if (fam == AF_INET6) {
2271		/* ok to use deprecated addresses? no lets not! */
2272		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2273			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2274			return (NULL);
2275		}
2276		if (ifa->src_is_priv && !ifa->src_is_loop) {
2277			if (dest_is_loop) {
2278				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2279				return (NULL);
2280			}
2281		}
2282		if (ifa->src_is_glob) {
2283			if (dest_is_loop) {
2284				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2285				return (NULL);
2286			}
2287		}
2288	}
2289#endif
2290	/*
2291	 * Now that we know what is what, implement or table this could in
2292	 * theory be done slicker (it used to be), but this is
2293	 * straightforward and easier to validate :-)
2294	 */
2295	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2296	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2297	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2298	    dest_is_loop, dest_is_priv, dest_is_global);
2299
2300	if ((ifa->src_is_loop) && (dest_is_priv)) {
2301		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2302		return (NULL);
2303	}
2304	if ((ifa->src_is_glob) && (dest_is_priv)) {
2305		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2306		return (NULL);
2307	}
2308	if ((ifa->src_is_loop) && (dest_is_global)) {
2309		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2310		return (NULL);
2311	}
2312	if ((ifa->src_is_priv) && (dest_is_global)) {
2313		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2314		return (NULL);
2315	}
2316	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2317	/* its a preferred address */
2318	return (ifa);
2319}
2320
2321static struct sctp_ifa *
2322sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2323    uint8_t dest_is_loop,
2324    uint8_t dest_is_priv,
2325    sa_family_t fam)
2326{
2327	uint8_t dest_is_global = 0;
2328
2329	/**
2330	 * Here we determine if its a acceptable address. A acceptable
2331	 * address means it is the same scope or higher scope but we can
2332	 * allow for NAT which means its ok to have a global dest and a
2333	 * private src.
2334	 *
2335	 * L = loopback, P = private, G = global
2336	 * -----------------------------------------
2337	 *  src    |  dest | result
2338	 * -----------------------------------------
2339	 *   L     |   L   |    yes
2340	 *  -----------------------------------------
2341	 *   P     |   L   |    yes-v4 no-v6
2342	 *  -----------------------------------------
2343	 *   G     |   L   |    yes
2344	 * -----------------------------------------
2345	 *   L     |   P   |    no
2346	 * -----------------------------------------
2347	 *   P     |   P   |    yes
2348	 * -----------------------------------------
2349	 *   G     |   P   |    yes - May not work
2350	 * -----------------------------------------
2351	 *   L     |   G   |    no
2352	 * -----------------------------------------
2353	 *   P     |   G   |    yes - May not work
2354	 * -----------------------------------------
2355	 *   G     |   G   |    yes
2356	 * -----------------------------------------
2357	 */
2358
2359	if (ifa->address.sa.sa_family != fam) {
2360		/* forget non matching family */
2361		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2362		    ifa->address.sa.sa_family, fam);
2363		return (NULL);
2364	}
2365	/* Ok the address may be ok */
2366	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2367	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2368	    dest_is_loop, dest_is_priv);
2369	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2370		dest_is_global = 1;
2371	}
2372#ifdef INET6
2373	if (fam == AF_INET6) {
2374		/* ok to use deprecated addresses? */
2375		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2376			return (NULL);
2377		}
2378		if (ifa->src_is_priv) {
2379			/* Special case, linklocal to loop */
2380			if (dest_is_loop)
2381				return (NULL);
2382		}
2383	}
2384#endif
2385	/*
2386	 * Now that we know what is what, implement our table. This could in
2387	 * theory be done slicker (it used to be), but this is
2388	 * straightforward and easier to validate :-)
2389	 */
2390	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2391	    ifa->src_is_loop,
2392	    dest_is_priv);
2393	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2394		return (NULL);
2395	}
2396	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2397	    ifa->src_is_loop,
2398	    dest_is_global);
2399	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2400		return (NULL);
2401	}
2402	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2403	/* its an acceptable address */
2404	return (ifa);
2405}
2406
2407int
2408sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2409{
2410	struct sctp_laddr *laddr;
2411
2412	if (stcb == NULL) {
2413		/* There are no restrictions, no TCB :-) */
2414		return (0);
2415	}
2416	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2417		if (laddr->ifa == NULL) {
2418			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2419			    __func__);
2420			continue;
2421		}
2422		if (laddr->ifa == ifa) {
2423			/* Yes it is on the list */
2424			return (1);
2425		}
2426	}
2427	return (0);
2428}
2429
2430
2431int
2432sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2433{
2434	struct sctp_laddr *laddr;
2435
2436	if (ifa == NULL)
2437		return (0);
2438	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2439		if (laddr->ifa == NULL) {
2440			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2441			    __func__);
2442			continue;
2443		}
2444		if ((laddr->ifa == ifa) && laddr->action == 0)
2445			/* same pointer */
2446			return (1);
2447	}
2448	return (0);
2449}
2450
2451
2452
2453static struct sctp_ifa *
2454sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2455    sctp_route_t *ro,
2456    uint32_t vrf_id,
2457    int non_asoc_addr_ok,
2458    uint8_t dest_is_priv,
2459    uint8_t dest_is_loop,
2460    sa_family_t fam)
2461{
2462	struct sctp_laddr *laddr, *starting_point;
2463	void *ifn;
2464	int resettotop = 0;
2465	struct sctp_ifn *sctp_ifn;
2466	struct sctp_ifa *sctp_ifa, *sifa;
2467	struct sctp_vrf *vrf;
2468	uint32_t ifn_index;
2469
2470	vrf = sctp_find_vrf(vrf_id);
2471	if (vrf == NULL)
2472		return (NULL);
2473
2474	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2475	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2476	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2477	/*
2478	 * first question, is the ifn we will emit on in our list, if so, we
2479	 * want such an address. Note that we first looked for a preferred
2480	 * address.
2481	 */
2482	if (sctp_ifn) {
2483		/* is a preferred one on the interface we route out? */
2484		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2485#ifdef INET
2486			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2487			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2488			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2489				continue;
2490			}
2491#endif
2492#ifdef INET6
2493			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2494			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2495			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2496				continue;
2497			}
2498#endif
2499			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2500			    (non_asoc_addr_ok == 0))
2501				continue;
2502			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2503			    dest_is_loop,
2504			    dest_is_priv, fam);
2505			if (sifa == NULL)
2506				continue;
2507			if (sctp_is_addr_in_ep(inp, sifa)) {
2508				atomic_add_int(&sifa->refcount, 1);
2509				return (sifa);
2510			}
2511		}
2512	}
2513	/*
2514	 * ok, now we now need to find one on the list of the addresses. We
2515	 * can't get one on the emitting interface so let's find first a
2516	 * preferred one. If not that an acceptable one otherwise... we
2517	 * return NULL.
2518	 */
2519	starting_point = inp->next_addr_touse;
2520once_again:
2521	if (inp->next_addr_touse == NULL) {
2522		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2523		resettotop = 1;
2524	}
2525	for (laddr = inp->next_addr_touse; laddr;
2526	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2527		if (laddr->ifa == NULL) {
2528			/* address has been removed */
2529			continue;
2530		}
2531		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2532			/* address is being deleted */
2533			continue;
2534		}
2535		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2536		    dest_is_priv, fam);
2537		if (sifa == NULL)
2538			continue;
2539		atomic_add_int(&sifa->refcount, 1);
2540		return (sifa);
2541	}
2542	if (resettotop == 0) {
2543		inp->next_addr_touse = NULL;
2544		goto once_again;
2545	}
2546	inp->next_addr_touse = starting_point;
2547	resettotop = 0;
2548once_again_too:
2549	if (inp->next_addr_touse == NULL) {
2550		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2551		resettotop = 1;
2552	}
2553	/* ok, what about an acceptable address in the inp */
2554	for (laddr = inp->next_addr_touse; laddr;
2555	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2556		if (laddr->ifa == NULL) {
2557			/* address has been removed */
2558			continue;
2559		}
2560		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2561			/* address is being deleted */
2562			continue;
2563		}
2564		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2565		    dest_is_priv, fam);
2566		if (sifa == NULL)
2567			continue;
2568		atomic_add_int(&sifa->refcount, 1);
2569		return (sifa);
2570	}
2571	if (resettotop == 0) {
2572		inp->next_addr_touse = NULL;
2573		goto once_again_too;
2574	}
2575	/*
2576	 * no address bound can be a source for the destination we are in
2577	 * trouble
2578	 */
2579	return (NULL);
2580}
2581
2582
2583
2584static struct sctp_ifa *
2585sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2586    struct sctp_tcb *stcb,
2587    sctp_route_t *ro,
2588    uint32_t vrf_id,
2589    uint8_t dest_is_priv,
2590    uint8_t dest_is_loop,
2591    int non_asoc_addr_ok,
2592    sa_family_t fam)
2593{
2594	struct sctp_laddr *laddr, *starting_point;
2595	void *ifn;
2596	struct sctp_ifn *sctp_ifn;
2597	struct sctp_ifa *sctp_ifa, *sifa;
2598	uint8_t start_at_beginning = 0;
2599	struct sctp_vrf *vrf;
2600	uint32_t ifn_index;
2601
2602	/*
2603	 * first question, is the ifn we will emit on in our list, if so, we
2604	 * want that one.
2605	 */
2606	vrf = sctp_find_vrf(vrf_id);
2607	if (vrf == NULL)
2608		return (NULL);
2609
2610	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2611	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2612	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2613
2614	/*
2615	 * first question, is the ifn we will emit on in our list?  If so,
2616	 * we want that one. First we look for a preferred. Second, we go
2617	 * for an acceptable.
2618	 */
2619	if (sctp_ifn) {
2620		/* first try for a preferred address on the ep */
2621		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2622#ifdef INET
2623			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2624			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2625			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2626				continue;
2627			}
2628#endif
2629#ifdef INET6
2630			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2631			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2632			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2633				continue;
2634			}
2635#endif
2636			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2637				continue;
2638			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2639				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2640				if (sifa == NULL)
2641					continue;
2642				if (((non_asoc_addr_ok == 0) &&
2643				    (sctp_is_addr_restricted(stcb, sifa))) ||
2644				    (non_asoc_addr_ok &&
2645				    (sctp_is_addr_restricted(stcb, sifa)) &&
2646				    (!sctp_is_addr_pending(stcb, sifa)))) {
2647					/* on the no-no list */
2648					continue;
2649				}
2650				atomic_add_int(&sifa->refcount, 1);
2651				return (sifa);
2652			}
2653		}
2654		/* next try for an acceptable address on the ep */
2655		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2656#ifdef INET
2657			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2658			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2659			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2660				continue;
2661			}
2662#endif
2663#ifdef INET6
2664			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2665			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2666			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2667				continue;
2668			}
2669#endif
2670			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2671				continue;
2672			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2673				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2674				if (sifa == NULL)
2675					continue;
2676				if (((non_asoc_addr_ok == 0) &&
2677				    (sctp_is_addr_restricted(stcb, sifa))) ||
2678				    (non_asoc_addr_ok &&
2679				    (sctp_is_addr_restricted(stcb, sifa)) &&
2680				    (!sctp_is_addr_pending(stcb, sifa)))) {
2681					/* on the no-no list */
2682					continue;
2683				}
2684				atomic_add_int(&sifa->refcount, 1);
2685				return (sifa);
2686			}
2687		}
2688
2689	}
2690	/*
2691	 * if we can't find one like that then we must look at all addresses
2692	 * bound to pick one at first preferable then secondly acceptable.
2693	 */
2694	starting_point = stcb->asoc.last_used_address;
2695sctp_from_the_top:
2696	if (stcb->asoc.last_used_address == NULL) {
2697		start_at_beginning = 1;
2698		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2699	}
2700	/* search beginning with the last used address */
2701	for (laddr = stcb->asoc.last_used_address; laddr;
2702	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2703		if (laddr->ifa == NULL) {
2704			/* address has been removed */
2705			continue;
2706		}
2707		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2708			/* address is being deleted */
2709			continue;
2710		}
2711		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2712		if (sifa == NULL)
2713			continue;
2714		if (((non_asoc_addr_ok == 0) &&
2715		    (sctp_is_addr_restricted(stcb, sifa))) ||
2716		    (non_asoc_addr_ok &&
2717		    (sctp_is_addr_restricted(stcb, sifa)) &&
2718		    (!sctp_is_addr_pending(stcb, sifa)))) {
2719			/* on the no-no list */
2720			continue;
2721		}
2722		stcb->asoc.last_used_address = laddr;
2723		atomic_add_int(&sifa->refcount, 1);
2724		return (sifa);
2725	}
2726	if (start_at_beginning == 0) {
2727		stcb->asoc.last_used_address = NULL;
2728		goto sctp_from_the_top;
2729	}
2730	/* now try for any higher scope than the destination */
2731	stcb->asoc.last_used_address = starting_point;
2732	start_at_beginning = 0;
2733sctp_from_the_top2:
2734	if (stcb->asoc.last_used_address == NULL) {
2735		start_at_beginning = 1;
2736		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2737	}
2738	/* search beginning with the last used address */
2739	for (laddr = stcb->asoc.last_used_address; laddr;
2740	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2741		if (laddr->ifa == NULL) {
2742			/* address has been removed */
2743			continue;
2744		}
2745		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2746			/* address is being deleted */
2747			continue;
2748		}
2749		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2750		    dest_is_priv, fam);
2751		if (sifa == NULL)
2752			continue;
2753		if (((non_asoc_addr_ok == 0) &&
2754		    (sctp_is_addr_restricted(stcb, sifa))) ||
2755		    (non_asoc_addr_ok &&
2756		    (sctp_is_addr_restricted(stcb, sifa)) &&
2757		    (!sctp_is_addr_pending(stcb, sifa)))) {
2758			/* on the no-no list */
2759			continue;
2760		}
2761		stcb->asoc.last_used_address = laddr;
2762		atomic_add_int(&sifa->refcount, 1);
2763		return (sifa);
2764	}
2765	if (start_at_beginning == 0) {
2766		stcb->asoc.last_used_address = NULL;
2767		goto sctp_from_the_top2;
2768	}
2769	return (NULL);
2770}
2771
2772static struct sctp_ifa *
2773sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2774    struct sctp_inpcb *inp,
2775    struct sctp_tcb *stcb,
2776    int non_asoc_addr_ok,
2777    uint8_t dest_is_loop,
2778    uint8_t dest_is_priv,
2779    int addr_wanted,
2780    sa_family_t fam,
2781    sctp_route_t *ro
2782)
2783{
2784	struct sctp_ifa *ifa, *sifa;
2785	int num_eligible_addr = 0;
2786#ifdef INET6
2787	struct sockaddr_in6 sin6, lsa6;
2788
2789	if (fam == AF_INET6) {
2790		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791		(void)sa6_recoverscope(&sin6);
2792	}
2793#endif				/* INET6 */
2794	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795#ifdef INET
2796		if ((ifa->address.sa.sa_family == AF_INET) &&
2797		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798		    &ifa->address.sin.sin_addr) != 0)) {
2799			continue;
2800		}
2801#endif
2802#ifdef INET6
2803		if ((ifa->address.sa.sa_family == AF_INET6) &&
2804		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805		    &ifa->address.sin6.sin6_addr) != 0)) {
2806			continue;
2807		}
2808#endif
2809		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810		    (non_asoc_addr_ok == 0))
2811			continue;
2812		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813		    dest_is_priv, fam);
2814		if (sifa == NULL)
2815			continue;
2816#ifdef INET6
2817		if (fam == AF_INET6 &&
2818		    dest_is_loop &&
2819		    sifa->src_is_loop && sifa->src_is_priv) {
2820			/*
2821			 * don't allow fe80::1 to be a src on loop ::1, we
2822			 * don't list it to the peer so we will get an
2823			 * abort.
2824			 */
2825			continue;
2826		}
2827		if (fam == AF_INET6 &&
2828		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830			/*
2831			 * link-local <-> link-local must belong to the same
2832			 * scope.
2833			 */
2834			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835			(void)sa6_recoverscope(&lsa6);
2836			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837				continue;
2838			}
2839		}
2840#endif				/* INET6 */
2841
2842		/*
2843		 * Check if the IPv6 address matches to next-hop. In the
2844		 * mobile case, old IPv6 address may be not deleted from the
2845		 * interface. Then, the interface has previous and new
2846		 * addresses.  We should use one corresponding to the
2847		 * next-hop.  (by micchie)
2848		 */
2849#ifdef INET6
2850		if (stcb && fam == AF_INET6 &&
2851		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853			    == 0) {
2854				continue;
2855			}
2856		}
2857#endif
2858#ifdef INET
2859		/* Avoid topologically incorrect IPv4 address */
2860		if (stcb && fam == AF_INET &&
2861		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863				continue;
2864			}
2865		}
2866#endif
2867		if (stcb) {
2868			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869				continue;
2870			}
2871			if (((non_asoc_addr_ok == 0) &&
2872			    (sctp_is_addr_restricted(stcb, sifa))) ||
2873			    (non_asoc_addr_ok &&
2874			    (sctp_is_addr_restricted(stcb, sifa)) &&
2875			    (!sctp_is_addr_pending(stcb, sifa)))) {
2876				/*
2877				 * It is restricted for some reason..
2878				 * probably not yet added.
2879				 */
2880				continue;
2881			}
2882		}
2883		if (num_eligible_addr >= addr_wanted) {
2884			return (sifa);
2885		}
2886		num_eligible_addr++;
2887	}
2888	return (NULL);
2889}
2890
2891
2892static int
2893sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894    struct sctp_inpcb *inp,
2895    struct sctp_tcb *stcb,
2896    int non_asoc_addr_ok,
2897    uint8_t dest_is_loop,
2898    uint8_t dest_is_priv,
2899    sa_family_t fam)
2900{
2901	struct sctp_ifa *ifa, *sifa;
2902	int num_eligible_addr = 0;
2903
2904	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905#ifdef INET
2906		if ((ifa->address.sa.sa_family == AF_INET) &&
2907		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908		    &ifa->address.sin.sin_addr) != 0)) {
2909			continue;
2910		}
2911#endif
2912#ifdef INET6
2913		if ((ifa->address.sa.sa_family == AF_INET6) &&
2914		    (stcb != NULL) &&
2915		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916		    &ifa->address.sin6.sin6_addr) != 0)) {
2917			continue;
2918		}
2919#endif
2920		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921		    (non_asoc_addr_ok == 0)) {
2922			continue;
2923		}
2924		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925		    dest_is_priv, fam);
2926		if (sifa == NULL) {
2927			continue;
2928		}
2929		if (stcb) {
2930			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931				continue;
2932			}
2933			if (((non_asoc_addr_ok == 0) &&
2934			    (sctp_is_addr_restricted(stcb, sifa))) ||
2935			    (non_asoc_addr_ok &&
2936			    (sctp_is_addr_restricted(stcb, sifa)) &&
2937			    (!sctp_is_addr_pending(stcb, sifa)))) {
2938				/*
2939				 * It is restricted for some reason..
2940				 * probably not yet added.
2941				 */
2942				continue;
2943			}
2944		}
2945		num_eligible_addr++;
2946	}
2947	return (num_eligible_addr);
2948}
2949
2950static struct sctp_ifa *
2951sctp_choose_boundall(struct sctp_inpcb *inp,
2952    struct sctp_tcb *stcb,
2953    struct sctp_nets *net,
2954    sctp_route_t *ro,
2955    uint32_t vrf_id,
2956    uint8_t dest_is_priv,
2957    uint8_t dest_is_loop,
2958    int non_asoc_addr_ok,
2959    sa_family_t fam)
2960{
2961	int cur_addr_num = 0, num_preferred = 0;
2962	void *ifn;
2963	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964	struct sctp_ifa *sctp_ifa, *sifa;
2965	uint32_t ifn_index;
2966	struct sctp_vrf *vrf;
2967#ifdef INET
2968	int retried = 0;
2969#endif
2970
2971	/*-
2972	 * For boundall we can use any address in the association.
2973	 * If non_asoc_addr_ok is set we can use any address (at least in
2974	 * theory). So we look for preferred addresses first. If we find one,
2975	 * we use it. Otherwise we next try to get an address on the
2976	 * interface, which we should be able to do (unless non_asoc_addr_ok
2977	 * is false and we are routed out that way). In these cases where we
2978	 * can't use the address of the interface we go through all the
2979	 * ifn's looking for an address we can use and fill that in. Punting
2980	 * means we send back address 0, which will probably cause problems
2981	 * actually since then IP will fill in the address of the route ifn,
2982	 * which means we probably already rejected it.. i.e. here comes an
2983	 * abort :-<.
2984	 */
2985	vrf = sctp_find_vrf(vrf_id);
2986	if (vrf == NULL)
2987		return (NULL);
2988
2989	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2990	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2991	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2992	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2993	if (sctp_ifn == NULL) {
2994		/* ?? We don't have this guy ?? */
2995		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2996		goto bound_all_plan_b;
2997	}
2998	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2999	    ifn_index, sctp_ifn->ifn_name);
3000
3001	if (net) {
3002		cur_addr_num = net->indx_of_eligible_next_to_use;
3003	}
3004	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3005	    inp, stcb,
3006	    non_asoc_addr_ok,
3007	    dest_is_loop,
3008	    dest_is_priv, fam);
3009	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3010	    num_preferred, sctp_ifn->ifn_name);
3011	if (num_preferred == 0) {
3012		/*
3013		 * no eligible addresses, we must use some other interface
3014		 * address if we can find one.
3015		 */
3016		goto bound_all_plan_b;
3017	}
3018	/*
3019	 * Ok we have num_eligible_addr set with how many we can use, this
3020	 * may vary from call to call due to addresses being deprecated
3021	 * etc..
3022	 */
3023	if (cur_addr_num >= num_preferred) {
3024		cur_addr_num = 0;
3025	}
3026	/*
3027	 * select the nth address from the list (where cur_addr_num is the
3028	 * nth) and 0 is the first one, 1 is the second one etc...
3029	 */
3030	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3031
3032	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3033	    dest_is_priv, cur_addr_num, fam, ro);
3034
3035	/* if sctp_ifa is NULL something changed??, fall to plan b. */
3036	if (sctp_ifa) {
3037		atomic_add_int(&sctp_ifa->refcount, 1);
3038		if (net) {
3039			/* save off where the next one we will want */
3040			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3041		}
3042		return (sctp_ifa);
3043	}
3044	/*
3045	 * plan_b: Look at all interfaces and find a preferred address. If
3046	 * no preferred fall through to plan_c.
3047	 */
3048bound_all_plan_b:
3049	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3050	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3051		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3052		    sctp_ifn->ifn_name);
3053		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054			/* wrong base scope */
3055			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3056			continue;
3057		}
3058		if ((sctp_ifn == looked_at) && looked_at) {
3059			/* already looked at this guy */
3060			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3061			continue;
3062		}
3063		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3064		    dest_is_loop, dest_is_priv, fam);
3065		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3066		    "Found ifn:%p %d preferred source addresses\n",
3067		    ifn, num_preferred);
3068		if (num_preferred == 0) {
3069			/* None on this interface. */
3070			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3071			continue;
3072		}
3073		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3074		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
3075		    num_preferred, (void *)sctp_ifn, cur_addr_num);
3076
3077		/*
3078		 * Ok we have num_eligible_addr set with how many we can
3079		 * use, this may vary from call to call due to addresses
3080		 * being deprecated etc..
3081		 */
3082		if (cur_addr_num >= num_preferred) {
3083			cur_addr_num = 0;
3084		}
3085		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3086		    dest_is_priv, cur_addr_num, fam, ro);
3087		if (sifa == NULL)
3088			continue;
3089		if (net) {
3090			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3091			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3092			    cur_addr_num);
3093			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3094			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3095			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3096			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3097		}
3098		atomic_add_int(&sifa->refcount, 1);
3099		return (sifa);
3100	}
3101#ifdef INET
3102again_with_private_addresses_allowed:
3103#endif
3104	/* plan_c: do we have an acceptable address on the emit interface */
3105	sifa = NULL;
3106	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3107	if (emit_ifn == NULL) {
3108		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3109		goto plan_d;
3110	}
3111	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3112		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3113#ifdef INET
3114		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3115		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3116		    &sctp_ifa->address.sin.sin_addr) != 0)) {
3117			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3118			continue;
3119		}
3120#endif
3121#ifdef INET6
3122		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3123		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3124		    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3125			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3126			continue;
3127		}
3128#endif
3129		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3130		    (non_asoc_addr_ok == 0)) {
3131			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3132			continue;
3133		}
3134		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3135		    dest_is_priv, fam);
3136		if (sifa == NULL) {
3137			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3138			continue;
3139		}
3140		if (stcb) {
3141			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3142				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3143				sifa = NULL;
3144				continue;
3145			}
3146			if (((non_asoc_addr_ok == 0) &&
3147			    (sctp_is_addr_restricted(stcb, sifa))) ||
3148			    (non_asoc_addr_ok &&
3149			    (sctp_is_addr_restricted(stcb, sifa)) &&
3150			    (!sctp_is_addr_pending(stcb, sifa)))) {
3151				/*
3152				 * It is restricted for some reason..
3153				 * probably not yet added.
3154				 */
3155				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3156				sifa = NULL;
3157				continue;
3158			}
3159		}
3160		atomic_add_int(&sifa->refcount, 1);
3161		goto out;
3162	}
3163plan_d:
3164	/*
3165	 * plan_d: We are in trouble. No preferred address on the emit
3166	 * interface. And not even a preferred address on all interfaces. Go
3167	 * out and see if we can find an acceptable address somewhere
3168	 * amongst all interfaces.
3169	 */
3170	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3171	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3172		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3173			/* wrong base scope */
3174			continue;
3175		}
3176		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3177#ifdef INET
3178			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3179			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3180			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3181				continue;
3182			}
3183#endif
3184#ifdef INET6
3185			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3186			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3187			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3188				continue;
3189			}
3190#endif
3191			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3192			    (non_asoc_addr_ok == 0))
3193				continue;
3194			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3195			    dest_is_loop,
3196			    dest_is_priv, fam);
3197			if (sifa == NULL)
3198				continue;
3199			if (stcb) {
3200				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3201					sifa = NULL;
3202					continue;
3203				}
3204				if (((non_asoc_addr_ok == 0) &&
3205				    (sctp_is_addr_restricted(stcb, sifa))) ||
3206				    (non_asoc_addr_ok &&
3207				    (sctp_is_addr_restricted(stcb, sifa)) &&
3208				    (!sctp_is_addr_pending(stcb, sifa)))) {
3209					/*
3210					 * It is restricted for some
3211					 * reason.. probably not yet added.
3212					 */
3213					sifa = NULL;
3214					continue;
3215				}
3216			}
3217			goto out;
3218		}
3219	}
3220#ifdef INET
3221	if (stcb) {
3222		if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3223			stcb->asoc.scope.ipv4_local_scope = 1;
3224			retried = 1;
3225			goto again_with_private_addresses_allowed;
3226		} else if (retried == 1) {
3227			stcb->asoc.scope.ipv4_local_scope = 0;
3228		}
3229	}
3230#endif
3231out:
3232#ifdef INET
3233	if (sifa) {
3234		if (retried == 1) {
3235			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3236				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3237					/* wrong base scope */
3238					continue;
3239				}
3240				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3241					struct sctp_ifa *tmp_sifa;
3242
3243#ifdef INET
3244					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3245					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3246					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3247						continue;
3248					}
3249#endif
3250#ifdef INET6
3251					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3252					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3253					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3254						continue;
3255					}
3256#endif
3257					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3258					    (non_asoc_addr_ok == 0))
3259						continue;
3260					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3261					    dest_is_loop,
3262					    dest_is_priv, fam);
3263					if (tmp_sifa == NULL) {
3264						continue;
3265					}
3266					if (tmp_sifa == sifa) {
3267						continue;
3268					}
3269					if (stcb) {
3270						if (sctp_is_address_in_scope(tmp_sifa,
3271						    &stcb->asoc.scope, 0) == 0) {
3272							continue;
3273						}
3274						if (((non_asoc_addr_ok == 0) &&
3275						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3276						    (non_asoc_addr_ok &&
3277						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3278						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3279							/*
3280							 * It is restricted
3281							 * for some reason..
3282							 * probably not yet
3283							 * added.
3284							 */
3285							continue;
3286						}
3287					}
3288					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3289					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3290						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3291					}
3292				}
3293			}
3294		}
3295		atomic_add_int(&sifa->refcount, 1);
3296	}
3297#endif
3298	return (sifa);
3299}
3300
3301
3302
3303/* tcb may be NULL */
3304struct sctp_ifa *
3305sctp_source_address_selection(struct sctp_inpcb *inp,
3306    struct sctp_tcb *stcb,
3307    sctp_route_t *ro,
3308    struct sctp_nets *net,
3309    int non_asoc_addr_ok, uint32_t vrf_id)
3310{
3311	struct sctp_ifa *answer;
3312	uint8_t dest_is_priv, dest_is_loop;
3313	sa_family_t fam;
3314#ifdef INET
3315	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3316#endif
3317#ifdef INET6
3318	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3319#endif
3320
3321	/**
3322	 * Rules:
3323	 * - Find the route if needed, cache if I can.
3324	 * - Look at interface address in route, Is it in the bound list. If so we
3325	 *   have the best source.
3326	 * - If not we must rotate amongst the addresses.
3327	 *
3328	 * Cavets and issues
3329	 *
3330	 * Do we need to pay attention to scope. We can have a private address
3331	 * or a global address we are sourcing or sending to. So if we draw
3332	 * it out
3333	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3334	 * For V4
3335	 * ------------------------------------------
3336	 *      source     *      dest  *  result
3337	 * -----------------------------------------
3338	 * <a>  Private    *    Global  *  NAT
3339	 * -----------------------------------------
3340	 * <b>  Private    *    Private *  No problem
3341	 * -----------------------------------------
3342	 * <c>  Global     *    Private *  Huh, How will this work?
3343	 * -----------------------------------------
3344	 * <d>  Global     *    Global  *  No Problem
3345	 *------------------------------------------
3346	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3347	 * For V6
3348	 *------------------------------------------
3349	 *      source     *      dest  *  result
3350	 * -----------------------------------------
3351	 * <a>  Linklocal  *    Global  *
3352	 * -----------------------------------------
3353	 * <b>  Linklocal  * Linklocal  *  No problem
3354	 * -----------------------------------------
3355	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3356	 * -----------------------------------------
3357	 * <d>  Global     *    Global  *  No Problem
3358	 *------------------------------------------
3359	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3360	 *
3361	 * And then we add to that what happens if there are multiple addresses
3362	 * assigned to an interface. Remember the ifa on a ifn is a linked
3363	 * list of addresses. So one interface can have more than one IP
3364	 * address. What happens if we have both a private and a global
3365	 * address? Do we then use context of destination to sort out which
3366	 * one is best? And what about NAT's sending P->G may get you a NAT
3367	 * translation, or should you select the G thats on the interface in
3368	 * preference.
3369	 *
3370	 * Decisions:
3371	 *
3372	 * - count the number of addresses on the interface.
3373	 * - if it is one, no problem except case <c>.
3374	 *   For <a> we will assume a NAT out there.
3375	 * - if there are more than one, then we need to worry about scope P
3376	 *   or G. We should prefer G -> G and P -> P if possible.
3377	 *   Then as a secondary fall back to mixed types G->P being a last
3378	 *   ditch one.
3379	 * - The above all works for bound all, but bound specific we need to
3380	 *   use the same concept but instead only consider the bound
3381	 *   addresses. If the bound set is NOT assigned to the interface then
3382	 *   we must use rotation amongst the bound addresses..
3383	 */
3384	if (ro->ro_rt == NULL) {
3385		/*
3386		 * Need a route to cache.
3387		 */
3388		SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3389	}
3390	if (ro->ro_rt == NULL) {
3391		return (NULL);
3392	}
3393	fam = ro->ro_dst.sa_family;
3394	dest_is_priv = dest_is_loop = 0;
3395	/* Setup our scopes for the destination */
3396	switch (fam) {
3397#ifdef INET
3398	case AF_INET:
3399		/* Scope based on outbound address */
3400		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3401			dest_is_loop = 1;
3402			if (net != NULL) {
3403				/* mark it as local */
3404				net->addr_is_local = 1;
3405			}
3406		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3407			dest_is_priv = 1;
3408		}
3409		break;
3410#endif
3411#ifdef INET6
3412	case AF_INET6:
3413		/* Scope based on outbound address */
3414		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3415		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3416			/*
3417			 * If the address is a loopback address, which
3418			 * consists of "::1" OR "fe80::1%lo0", we are
3419			 * loopback scope. But we don't use dest_is_priv
3420			 * (link local addresses).
3421			 */
3422			dest_is_loop = 1;
3423			if (net != NULL) {
3424				/* mark it as local */
3425				net->addr_is_local = 1;
3426			}
3427		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3428			dest_is_priv = 1;
3429		}
3430		break;
3431#endif
3432	}
3433	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3434	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3435	SCTP_IPI_ADDR_RLOCK();
3436	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3437		/*
3438		 * Bound all case
3439		 */
3440		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3441		    dest_is_priv, dest_is_loop,
3442		    non_asoc_addr_ok, fam);
3443		SCTP_IPI_ADDR_RUNLOCK();
3444		return (answer);
3445	}
3446	/*
3447	 * Subset bound case
3448	 */
3449	if (stcb) {
3450		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3451		    vrf_id, dest_is_priv,
3452		    dest_is_loop,
3453		    non_asoc_addr_ok, fam);
3454	} else {
3455		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3456		    non_asoc_addr_ok,
3457		    dest_is_priv,
3458		    dest_is_loop, fam);
3459	}
3460	SCTP_IPI_ADDR_RUNLOCK();
3461	return (answer);
3462}
3463
3464static int
3465sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3466{
3467	struct cmsghdr cmh;
3468	int tlen, at, found;
3469	struct sctp_sndinfo sndinfo;
3470	struct sctp_prinfo prinfo;
3471	struct sctp_authinfo authinfo;
3472
3473	tlen = SCTP_BUF_LEN(control);
3474	at = 0;
3475	found = 0;
3476	/*
3477	 * Independent of how many mbufs, find the c_type inside the control
3478	 * structure and copy out the data.
3479	 */
3480	while (at < tlen) {
3481		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3482			/* There is not enough room for one more. */
3483			return (found);
3484		}
3485		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3486		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3487			/* We dont't have a complete CMSG header. */
3488			return (found);
3489		}
3490		if (((int)cmh.cmsg_len + at) > tlen) {
3491			/* We don't have the complete CMSG. */
3492			return (found);
3493		}
3494		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3495		    ((c_type == cmh.cmsg_type) ||
3496		    ((c_type == SCTP_SNDRCV) &&
3497		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3498		    (cmh.cmsg_type == SCTP_PRINFO) ||
3499		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3500			if (c_type == cmh.cmsg_type) {
3501				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3502					return (found);
3503				}
3504				/* It is exactly what we want. Copy it out. */
3505				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3506				return (1);
3507			} else {
3508				struct sctp_sndrcvinfo *sndrcvinfo;
3509
3510				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3511				if (found == 0) {
3512					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3513						return (found);
3514					}
3515					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3516				}
3517				switch (cmh.cmsg_type) {
3518				case SCTP_SNDINFO:
3519					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3520						return (found);
3521					}
3522					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3523					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3524					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3525					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3526					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3527					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3528					break;
3529				case SCTP_PRINFO:
3530					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3531						return (found);
3532					}
3533					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3534					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3535						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3536					} else {
3537						sndrcvinfo->sinfo_timetolive = 0;
3538					}
3539					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3540					break;
3541				case SCTP_AUTHINFO:
3542					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3543						return (found);
3544					}
3545					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3546					sndrcvinfo->sinfo_keynumber_valid = 1;
3547					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3548					break;
3549				default:
3550					return (found);
3551				}
3552				found = 1;
3553			}
3554		}
3555		at += CMSG_ALIGN(cmh.cmsg_len);
3556	}
3557	return (found);
3558}
3559
3560static int
3561sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3562{
3563	struct cmsghdr cmh;
3564	int tlen, at;
3565	struct sctp_initmsg initmsg;
3566#ifdef INET
3567	struct sockaddr_in sin;
3568#endif
3569#ifdef INET6
3570	struct sockaddr_in6 sin6;
3571#endif
3572
3573	tlen = SCTP_BUF_LEN(control);
3574	at = 0;
3575	while (at < tlen) {
3576		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3577			/* There is not enough room for one more. */
3578			*error = EINVAL;
3579			return (1);
3580		}
3581		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3582		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3583			/* We dont't have a complete CMSG header. */
3584			*error = EINVAL;
3585			return (1);
3586		}
3587		if (((int)cmh.cmsg_len + at) > tlen) {
3588			/* We don't have the complete CMSG. */
3589			*error = EINVAL;
3590			return (1);
3591		}
3592		if (cmh.cmsg_level == IPPROTO_SCTP) {
3593			switch (cmh.cmsg_type) {
3594			case SCTP_INIT:
3595				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3596					*error = EINVAL;
3597					return (1);
3598				}
3599				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3600				if (initmsg.sinit_max_attempts)
3601					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3602				if (initmsg.sinit_num_ostreams)
3603					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3604				if (initmsg.sinit_max_instreams)
3605					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3606				if (initmsg.sinit_max_init_timeo)
3607					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3608				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3609					struct sctp_stream_out *tmp_str;
3610					unsigned int i;
3611#if defined(SCTP_DETAILED_STR_STATS)
3612					int j;
3613#endif
3614
3615					/* Default is NOT correct */
3616					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3617					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3618					SCTP_TCB_UNLOCK(stcb);
3619					SCTP_MALLOC(tmp_str,
3620					    struct sctp_stream_out *,
3621					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3622					    SCTP_M_STRMO);
3623					SCTP_TCB_LOCK(stcb);
3624					if (tmp_str != NULL) {
3625						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3626						stcb->asoc.strmout = tmp_str;
3627						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3628					} else {
3629						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3630					}
3631					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3632						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3633						stcb->asoc.strmout[i].chunks_on_queues = 0;
3634						stcb->asoc.strmout[i].next_mid_ordered = 0;
3635						stcb->asoc.strmout[i].next_mid_unordered = 0;
3636#if defined(SCTP_DETAILED_STR_STATS)
3637						for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3638							stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3639							stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3640						}
3641#else
3642						stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3643						stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3644#endif
3645						stcb->asoc.strmout[i].sid = i;
3646						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647						stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648						stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3649					}
3650				}
3651				break;
3652#ifdef INET
3653			case SCTP_DSTADDRV4:
3654				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3655					*error = EINVAL;
3656					return (1);
3657				}
3658				memset(&sin, 0, sizeof(struct sockaddr_in));
3659				sin.sin_family = AF_INET;
3660				sin.sin_len = sizeof(struct sockaddr_in);
3661				sin.sin_port = stcb->rport;
3662				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3663				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3664				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3665				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3666					*error = EINVAL;
3667					return (1);
3668				}
3669				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3670				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3671					*error = ENOBUFS;
3672					return (1);
3673				}
3674				break;
3675#endif
3676#ifdef INET6
3677			case SCTP_DSTADDRV6:
3678				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3679					*error = EINVAL;
3680					return (1);
3681				}
3682				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3683				sin6.sin6_family = AF_INET6;
3684				sin6.sin6_len = sizeof(struct sockaddr_in6);
3685				sin6.sin6_port = stcb->rport;
3686				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3687				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3688				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3689					*error = EINVAL;
3690					return (1);
3691				}
3692#ifdef INET
3693				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3694					in6_sin6_2_sin(&sin, &sin6);
3695					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3696					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3697					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3698						*error = EINVAL;
3699						return (1);
3700					}
3701					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3702					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703						*error = ENOBUFS;
3704						return (1);
3705					}
3706				} else
3707#endif
3708					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3709				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710					*error = ENOBUFS;
3711					return (1);
3712				}
3713				break;
3714#endif
3715			default:
3716				break;
3717			}
3718		}
3719		at += CMSG_ALIGN(cmh.cmsg_len);
3720	}
3721	return (0);
3722}
3723
3724static struct sctp_tcb *
3725sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3726    uint16_t port,
3727    struct mbuf *control,
3728    struct sctp_nets **net_p,
3729    int *error)
3730{
3731	struct cmsghdr cmh;
3732	int tlen, at;
3733	struct sctp_tcb *stcb;
3734	struct sockaddr *addr;
3735#ifdef INET
3736	struct sockaddr_in sin;
3737#endif
3738#ifdef INET6
3739	struct sockaddr_in6 sin6;
3740#endif
3741
3742	tlen = SCTP_BUF_LEN(control);
3743	at = 0;
3744	while (at < tlen) {
3745		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3746			/* There is not enough room for one more. */
3747			*error = EINVAL;
3748			return (NULL);
3749		}
3750		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3751		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3752			/* We dont't have a complete CMSG header. */
3753			*error = EINVAL;
3754			return (NULL);
3755		}
3756		if (((int)cmh.cmsg_len + at) > tlen) {
3757			/* We don't have the complete CMSG. */
3758			*error = EINVAL;
3759			return (NULL);
3760		}
3761		if (cmh.cmsg_level == IPPROTO_SCTP) {
3762			switch (cmh.cmsg_type) {
3763#ifdef INET
3764			case SCTP_DSTADDRV4:
3765				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3766					*error = EINVAL;
3767					return (NULL);
3768				}
3769				memset(&sin, 0, sizeof(struct sockaddr_in));
3770				sin.sin_family = AF_INET;
3771				sin.sin_len = sizeof(struct sockaddr_in);
3772				sin.sin_port = port;
3773				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3774				addr = (struct sockaddr *)&sin;
3775				break;
3776#endif
3777#ifdef INET6
3778			case SCTP_DSTADDRV6:
3779				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3780					*error = EINVAL;
3781					return (NULL);
3782				}
3783				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3784				sin6.sin6_family = AF_INET6;
3785				sin6.sin6_len = sizeof(struct sockaddr_in6);
3786				sin6.sin6_port = port;
3787				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3788#ifdef INET
3789				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3790					in6_sin6_2_sin(&sin, &sin6);
3791					addr = (struct sockaddr *)&sin;
3792				} else
3793#endif
3794					addr = (struct sockaddr *)&sin6;
3795				break;
3796#endif
3797			default:
3798				addr = NULL;
3799				break;
3800			}
3801			if (addr) {
3802				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3803				if (stcb != NULL) {
3804					return (stcb);
3805				}
3806			}
3807		}
3808		at += CMSG_ALIGN(cmh.cmsg_len);
3809	}
3810	return (NULL);
3811}
3812
3813static struct mbuf *
3814sctp_add_cookie(struct mbuf *init, int init_offset,
3815    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3816{
3817	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3818	struct sctp_state_cookie *stc;
3819	struct sctp_paramhdr *ph;
3820	uint8_t *foo;
3821	int sig_offset;
3822	uint16_t cookie_sz;
3823
3824	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3825	    sizeof(struct sctp_paramhdr)), 0,
3826	    M_NOWAIT, 1, MT_DATA);
3827	if (mret == NULL) {
3828		return (NULL);
3829	}
3830	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3831	if (copy_init == NULL) {
3832		sctp_m_freem(mret);
3833		return (NULL);
3834	}
3835#ifdef SCTP_MBUF_LOGGING
3836	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3837		sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3838	}
3839#endif
3840	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3841	    M_NOWAIT);
3842	if (copy_initack == NULL) {
3843		sctp_m_freem(mret);
3844		sctp_m_freem(copy_init);
3845		return (NULL);
3846	}
3847#ifdef SCTP_MBUF_LOGGING
3848	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849		sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3850	}
3851#endif
3852	/* easy side we just drop it on the end */
3853	ph = mtod(mret, struct sctp_paramhdr *);
3854	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3855	    sizeof(struct sctp_paramhdr);
3856	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3857	    sizeof(struct sctp_paramhdr));
3858	ph->param_type = htons(SCTP_STATE_COOKIE);
3859	ph->param_length = 0;	/* fill in at the end */
3860	/* Fill in the stc cookie data */
3861	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3862
3863	/* tack the INIT and then the INIT-ACK onto the chain */
3864	cookie_sz = 0;
3865	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3866		cookie_sz += SCTP_BUF_LEN(m_at);
3867		if (SCTP_BUF_NEXT(m_at) == NULL) {
3868			SCTP_BUF_NEXT(m_at) = copy_init;
3869			break;
3870		}
3871	}
3872	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873		cookie_sz += SCTP_BUF_LEN(m_at);
3874		if (SCTP_BUF_NEXT(m_at) == NULL) {
3875			SCTP_BUF_NEXT(m_at) = copy_initack;
3876			break;
3877		}
3878	}
3879	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880		cookie_sz += SCTP_BUF_LEN(m_at);
3881		if (SCTP_BUF_NEXT(m_at) == NULL) {
3882			break;
3883		}
3884	}
3885	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3886	if (sig == NULL) {
3887		/* no space, so free the entire chain */
3888		sctp_m_freem(mret);
3889		return (NULL);
3890	}
3891	SCTP_BUF_LEN(sig) = 0;
3892	SCTP_BUF_NEXT(m_at) = sig;
3893	sig_offset = 0;
3894	foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3895	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3896	*signature = foo;
3897	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3898	cookie_sz += SCTP_SIGNATURE_SIZE;
3899	ph->param_length = htons(cookie_sz);
3900	return (mret);
3901}
3902
3903
3904static uint8_t
3905sctp_get_ect(struct sctp_tcb *stcb)
3906{
3907	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3908		return (SCTP_ECT0_BIT);
3909	} else {
3910		return (0);
3911	}
3912}
3913
3914#if defined(INET) || defined(INET6)
3915static void
3916sctp_handle_no_route(struct sctp_tcb *stcb,
3917    struct sctp_nets *net,
3918    int so_locked)
3919{
3920	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3921
3922	if (net) {
3923		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3924		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3925		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3926			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3927				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3928				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3929				    stcb, 0,
3930				    (void *)net,
3931				    so_locked);
3932				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3933				net->dest_state &= ~SCTP_ADDR_PF;
3934			}
3935		}
3936		if (stcb) {
3937			if (net == stcb->asoc.primary_destination) {
3938				/* need a new primary */
3939				struct sctp_nets *alt;
3940
3941				alt = sctp_find_alternate_net(stcb, net, 0);
3942				if (alt != net) {
3943					if (stcb->asoc.alternate) {
3944						sctp_free_remote_addr(stcb->asoc.alternate);
3945					}
3946					stcb->asoc.alternate = alt;
3947					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3948					if (net->ro._s_addr) {
3949						sctp_free_ifa(net->ro._s_addr);
3950						net->ro._s_addr = NULL;
3951					}
3952					net->src_addr_selected = 0;
3953				}
3954			}
3955		}
3956	}
3957}
3958#endif
3959
3960static int
3961sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3962    struct sctp_tcb *stcb,	/* may be NULL */
3963    struct sctp_nets *net,
3964    struct sockaddr *to,
3965    struct mbuf *m,
3966    uint32_t auth_offset,
3967    struct sctp_auth_chunk *auth,
3968    uint16_t auth_keyid,
3969    int nofragment_flag,
3970    int ecn_ok,
3971    int out_of_asoc_ok,
3972    uint16_t src_port,
3973    uint16_t dest_port,
3974    uint32_t v_tag,
3975    uint16_t port,
3976    union sctp_sockstore *over_addr,
3977    uint8_t mflowtype, uint32_t mflowid,
3978#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3979    int so_locked SCTP_UNUSED
3980#else
3981    int so_locked
3982#endif
3983)
3984/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3985{
3986	/**
3987	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3988	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3989	 * - fill in the HMAC digest of any AUTH chunk in the packet.
3990	 * - calculate and fill in the SCTP checksum.
3991	 * - prepend an IP address header.
3992	 * - if boundall use INADDR_ANY.
3993	 * - if boundspecific do source address selection.
3994	 * - set fragmentation option for ipV4.
3995	 * - On return from IP output, check/adjust mtu size of output
3996	 *   interface and smallest_mtu size as well.
3997	 */
3998	/* Will need ifdefs around this */
3999	struct mbuf *newm;
4000	struct sctphdr *sctphdr;
4001	int packet_length;
4002	int ret;
4003#if defined(INET) || defined(INET6)
4004	uint32_t vrf_id;
4005#endif
4006#if defined(INET) || defined(INET6)
4007	struct mbuf *o_pak;
4008	sctp_route_t *ro = NULL;
4009	struct udphdr *udp = NULL;
4010#endif
4011	uint8_t tos_value;
4012#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013	struct socket *so = NULL;
4014#endif
4015
4016	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4017		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4018		sctp_m_freem(m);
4019		return (EFAULT);
4020	}
4021#if defined(INET) || defined(INET6)
4022	if (stcb) {
4023		vrf_id = stcb->asoc.vrf_id;
4024	} else {
4025		vrf_id = inp->def_vrf_id;
4026	}
4027#endif
4028	/* fill in the HMAC digest for any AUTH chunk in the packet */
4029	if ((auth != NULL) && (stcb != NULL)) {
4030		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4031	}
4032	if (net) {
4033		tos_value = net->dscp;
4034	} else if (stcb) {
4035		tos_value = stcb->asoc.default_dscp;
4036	} else {
4037		tos_value = inp->sctp_ep.default_dscp;
4038	}
4039
4040	switch (to->sa_family) {
4041#ifdef INET
4042	case AF_INET:
4043		{
4044			struct ip *ip = NULL;
4045			sctp_route_t iproute;
4046			int len;
4047
4048			len = SCTP_MIN_V4_OVERHEAD;
4049			if (port) {
4050				len += sizeof(struct udphdr);
4051			}
4052			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4053			if (newm == NULL) {
4054				sctp_m_freem(m);
4055				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4056				return (ENOMEM);
4057			}
4058			SCTP_ALIGN_TO_END(newm, len);
4059			SCTP_BUF_LEN(newm) = len;
4060			SCTP_BUF_NEXT(newm) = m;
4061			m = newm;
4062			if (net != NULL) {
4063				m->m_pkthdr.flowid = net->flowid;
4064				M_HASHTYPE_SET(m, net->flowtype);
4065			} else {
4066				m->m_pkthdr.flowid = mflowid;
4067				M_HASHTYPE_SET(m, mflowtype);
4068			}
4069			packet_length = sctp_calculate_len(m);
4070			ip = mtod(m, struct ip *);
4071			ip->ip_v = IPVERSION;
4072			ip->ip_hl = (sizeof(struct ip) >> 2);
4073			if (tos_value == 0) {
4074				/*
4075				 * This means especially, that it is not set
4076				 * at the SCTP layer. So use the value from
4077				 * the IP layer.
4078				 */
4079				tos_value = inp->ip_inp.inp.inp_ip_tos;
4080			}
4081			tos_value &= 0xfc;
4082			if (ecn_ok) {
4083				tos_value |= sctp_get_ect(stcb);
4084			}
4085			if ((nofragment_flag) && (port == 0)) {
4086				ip->ip_off = htons(IP_DF);
4087			} else {
4088				ip->ip_off = htons(0);
4089			}
4090			/* FreeBSD has a function for ip_id's */
4091			ip_fillid(ip);
4092
4093			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4094			ip->ip_len = htons(packet_length);
4095			ip->ip_tos = tos_value;
4096			if (port) {
4097				ip->ip_p = IPPROTO_UDP;
4098			} else {
4099				ip->ip_p = IPPROTO_SCTP;
4100			}
4101			ip->ip_sum = 0;
4102			if (net == NULL) {
4103				ro = &iproute;
4104				memset(&iproute, 0, sizeof(iproute));
4105				memcpy(&ro->ro_dst, to, to->sa_len);
4106			} else {
4107				ro = (sctp_route_t *)&net->ro;
4108			}
4109			/* Now the address selection part */
4110			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4111
4112			/* call the routine to select the src address */
4113			if (net && out_of_asoc_ok == 0) {
4114				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4115					sctp_free_ifa(net->ro._s_addr);
4116					net->ro._s_addr = NULL;
4117					net->src_addr_selected = 0;
4118					if (ro->ro_rt) {
4119						RTFREE(ro->ro_rt);
4120						ro->ro_rt = NULL;
4121					}
4122				}
4123				if (net->src_addr_selected == 0) {
4124					/* Cache the source address */
4125					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4126					    ro, net, 0,
4127					    vrf_id);
4128					net->src_addr_selected = 1;
4129				}
4130				if (net->ro._s_addr == NULL) {
4131					/* No route to host */
4132					net->src_addr_selected = 0;
4133					sctp_handle_no_route(stcb, net, so_locked);
4134					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135					sctp_m_freem(m);
4136					return (EHOSTUNREACH);
4137				}
4138				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4139			} else {
4140				if (over_addr == NULL) {
4141					struct sctp_ifa *_lsrc;
4142
4143					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4144					    net,
4145					    out_of_asoc_ok,
4146					    vrf_id);
4147					if (_lsrc == NULL) {
4148						sctp_handle_no_route(stcb, net, so_locked);
4149						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150						sctp_m_freem(m);
4151						return (EHOSTUNREACH);
4152					}
4153					ip->ip_src = _lsrc->address.sin.sin_addr;
4154					sctp_free_ifa(_lsrc);
4155				} else {
4156					ip->ip_src = over_addr->sin.sin_addr;
4157					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4158				}
4159			}
4160			if (port) {
4161				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4162					sctp_handle_no_route(stcb, net, so_locked);
4163					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164					sctp_m_freem(m);
4165					return (EHOSTUNREACH);
4166				}
4167				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4168				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4169				udp->uh_dport = port;
4170				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4171				if (V_udp_cksum) {
4172					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4173				} else {
4174					udp->uh_sum = 0;
4175				}
4176				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4177			} else {
4178				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4179			}
4180
4181			sctphdr->src_port = src_port;
4182			sctphdr->dest_port = dest_port;
4183			sctphdr->v_tag = v_tag;
4184			sctphdr->checksum = 0;
4185
4186			/*
4187			 * If source address selection fails and we find no
4188			 * route then the ip_output should fail as well with
4189			 * a NO_ROUTE_TO_HOST type error. We probably should
4190			 * catch that somewhere and abort the association
4191			 * right away (assuming this is an INIT being sent).
4192			 */
4193			if (ro->ro_rt == NULL) {
4194				/*
4195				 * src addr selection failed to find a route
4196				 * (or valid source addr), so we can't get
4197				 * there from here (yet)!
4198				 */
4199				sctp_handle_no_route(stcb, net, so_locked);
4200				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201				sctp_m_freem(m);
4202				return (EHOSTUNREACH);
4203			}
4204			if (ro != &iproute) {
4205				memcpy(&iproute, ro, sizeof(*ro));
4206			}
4207			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4208			    (uint32_t)(ntohl(ip->ip_src.s_addr)));
4209			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4210			    (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4211			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4212			    (void *)ro->ro_rt);
4213
4214			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4215				/* failed to prepend data, give up */
4216				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4217				sctp_m_freem(m);
4218				return (ENOMEM);
4219			}
4220			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4221			if (port) {
4222#if defined(SCTP_WITH_NO_CSUM)
4223				SCTP_STAT_INCR(sctps_sendnocrc);
4224#else
4225				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4226				SCTP_STAT_INCR(sctps_sendswcrc);
4227#endif
4228				if (V_udp_cksum) {
4229					SCTP_ENABLE_UDP_CSUM(o_pak);
4230				}
4231			} else {
4232#if defined(SCTP_WITH_NO_CSUM)
4233				SCTP_STAT_INCR(sctps_sendnocrc);
4234#else
4235				m->m_pkthdr.csum_flags = CSUM_SCTP;
4236				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4237				SCTP_STAT_INCR(sctps_sendhwcrc);
4238#endif
4239			}
4240#ifdef SCTP_PACKET_LOGGING
4241			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4242				sctp_packet_log(o_pak);
4243#endif
4244			/* send it out.  table id is taken from stcb */
4245#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4246			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4247				so = SCTP_INP_SO(inp);
4248				SCTP_SOCKET_UNLOCK(so, 0);
4249			}
4250#endif
4251			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4252#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4253			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4254				atomic_add_int(&stcb->asoc.refcnt, 1);
4255				SCTP_TCB_UNLOCK(stcb);
4256				SCTP_SOCKET_LOCK(so, 0);
4257				SCTP_TCB_LOCK(stcb);
4258				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4259			}
4260#endif
4261			SCTP_STAT_INCR(sctps_sendpackets);
4262			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4263			if (ret)
4264				SCTP_STAT_INCR(sctps_senderrors);
4265
4266			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4267			if (net == NULL) {
4268				/* free tempy routes */
4269				RO_RTFREE(ro);
4270			} else {
4271				/*
4272				 * PMTU check versus smallest asoc MTU goes
4273				 * here
4274				 */
4275				if ((ro->ro_rt != NULL) &&
4276				    (net->ro._s_addr)) {
4277					uint32_t mtu;
4278
4279					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4280					if (net->port) {
4281						mtu -= sizeof(struct udphdr);
4282					}
4283					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4284						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4285						net->mtu = mtu;
4286					}
4287				} else if (ro->ro_rt == NULL) {
4288					/* route was freed */
4289					if (net->ro._s_addr &&
4290					    net->src_addr_selected) {
4291						sctp_free_ifa(net->ro._s_addr);
4292						net->ro._s_addr = NULL;
4293					}
4294					net->src_addr_selected = 0;
4295				}
4296			}
4297			return (ret);
4298		}
4299#endif
4300#ifdef INET6
4301	case AF_INET6:
4302		{
4303			uint32_t flowlabel, flowinfo;
4304			struct ip6_hdr *ip6h;
4305			struct route_in6 ip6route;
4306			struct ifnet *ifp;
4307			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4308			int prev_scope = 0;
4309			struct sockaddr_in6 lsa6_storage;
4310			int error;
4311			u_short prev_port = 0;
4312			int len;
4313
4314			if (net) {
4315				flowlabel = net->flowlabel;
4316			} else if (stcb) {
4317				flowlabel = stcb->asoc.default_flowlabel;
4318			} else {
4319				flowlabel = inp->sctp_ep.default_flowlabel;
4320			}
4321			if (flowlabel == 0) {
4322				/*
4323				 * This means especially, that it is not set
4324				 * at the SCTP layer. So use the value from
4325				 * the IP layer.
4326				 */
4327				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4328			}
4329			flowlabel &= 0x000fffff;
4330			len = SCTP_MIN_OVERHEAD;
4331			if (port) {
4332				len += sizeof(struct udphdr);
4333			}
4334			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4335			if (newm == NULL) {
4336				sctp_m_freem(m);
4337				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4338				return (ENOMEM);
4339			}
4340			SCTP_ALIGN_TO_END(newm, len);
4341			SCTP_BUF_LEN(newm) = len;
4342			SCTP_BUF_NEXT(newm) = m;
4343			m = newm;
4344			if (net != NULL) {
4345				m->m_pkthdr.flowid = net->flowid;
4346				M_HASHTYPE_SET(m, net->flowtype);
4347			} else {
4348				m->m_pkthdr.flowid = mflowid;
4349				M_HASHTYPE_SET(m, mflowtype);
4350			}
4351			packet_length = sctp_calculate_len(m);
4352
4353			ip6h = mtod(m, struct ip6_hdr *);
4354			/* protect *sin6 from overwrite */
4355			sin6 = (struct sockaddr_in6 *)to;
4356			tmp = *sin6;
4357			sin6 = &tmp;
4358
4359			/* KAME hack: embed scopeid */
4360			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4361				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4362				return (EINVAL);
4363			}
4364			if (net == NULL) {
4365				memset(&ip6route, 0, sizeof(ip6route));
4366				ro = (sctp_route_t *)&ip6route;
4367				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4368			} else {
4369				ro = (sctp_route_t *)&net->ro;
4370			}
4371			/*
4372			 * We assume here that inp_flow is in host byte
4373			 * order within the TCB!
4374			 */
4375			if (tos_value == 0) {
4376				/*
4377				 * This means especially, that it is not set
4378				 * at the SCTP layer. So use the value from
4379				 * the IP layer.
4380				 */
4381				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4382			}
4383			tos_value &= 0xfc;
4384			if (ecn_ok) {
4385				tos_value |= sctp_get_ect(stcb);
4386			}
4387			flowinfo = 0x06;
4388			flowinfo <<= 8;
4389			flowinfo |= tos_value;
4390			flowinfo <<= 20;
4391			flowinfo |= flowlabel;
4392			ip6h->ip6_flow = htonl(flowinfo);
4393			if (port) {
4394				ip6h->ip6_nxt = IPPROTO_UDP;
4395			} else {
4396				ip6h->ip6_nxt = IPPROTO_SCTP;
4397			}
4398			ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4399			ip6h->ip6_dst = sin6->sin6_addr;
4400
4401			/*
4402			 * Add SRC address selection here: we can only reuse
4403			 * to a limited degree the kame src-addr-sel, since
4404			 * we can try their selection but it may not be
4405			 * bound.
4406			 */
4407			memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4408			lsa6_tmp.sin6_family = AF_INET6;
4409			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4410			lsa6 = &lsa6_tmp;
4411			if (net && out_of_asoc_ok == 0) {
4412				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4413					sctp_free_ifa(net->ro._s_addr);
4414					net->ro._s_addr = NULL;
4415					net->src_addr_selected = 0;
4416					if (ro->ro_rt) {
4417						RTFREE(ro->ro_rt);
4418						ro->ro_rt = NULL;
4419					}
4420				}
4421				if (net->src_addr_selected == 0) {
4422					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4423					/* KAME hack: embed scopeid */
4424					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4425						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4426						return (EINVAL);
4427					}
4428					/* Cache the source address */
4429					net->ro._s_addr = sctp_source_address_selection(inp,
4430					    stcb,
4431					    ro,
4432					    net,
4433					    0,
4434					    vrf_id);
4435					(void)sa6_recoverscope(sin6);
4436					net->src_addr_selected = 1;
4437				}
4438				if (net->ro._s_addr == NULL) {
4439					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4440					net->src_addr_selected = 0;
4441					sctp_handle_no_route(stcb, net, so_locked);
4442					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4443					sctp_m_freem(m);
4444					return (EHOSTUNREACH);
4445				}
4446				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4447			} else {
4448				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4449				/* KAME hack: embed scopeid */
4450				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4451					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4452					return (EINVAL);
4453				}
4454				if (over_addr == NULL) {
4455					struct sctp_ifa *_lsrc;
4456
4457					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4458					    net,
4459					    out_of_asoc_ok,
4460					    vrf_id);
4461					if (_lsrc == NULL) {
4462						sctp_handle_no_route(stcb, net, so_locked);
4463						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464						sctp_m_freem(m);
4465						return (EHOSTUNREACH);
4466					}
4467					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4468					sctp_free_ifa(_lsrc);
4469				} else {
4470					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4471					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4472				}
4473				(void)sa6_recoverscope(sin6);
4474			}
4475			lsa6->sin6_port = inp->sctp_lport;
4476
4477			if (ro->ro_rt == NULL) {
4478				/*
4479				 * src addr selection failed to find a route
4480				 * (or valid source addr), so we can't get
4481				 * there from here!
4482				 */
4483				sctp_handle_no_route(stcb, net, so_locked);
4484				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4485				sctp_m_freem(m);
4486				return (EHOSTUNREACH);
4487			}
4488			/*
4489			 * XXX: sa6 may not have a valid sin6_scope_id in
4490			 * the non-SCOPEDROUTING case.
4491			 */
4492			memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4493			lsa6_storage.sin6_family = AF_INET6;
4494			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4495			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4496			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4497				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4498				sctp_m_freem(m);
4499				return (error);
4500			}
4501			/* XXX */
4502			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4503			lsa6_storage.sin6_port = inp->sctp_lport;
4504			lsa6 = &lsa6_storage;
4505			ip6h->ip6_src = lsa6->sin6_addr;
4506
4507			if (port) {
4508				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4509					sctp_handle_no_route(stcb, net, so_locked);
4510					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4511					sctp_m_freem(m);
4512					return (EHOSTUNREACH);
4513				}
4514				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4515				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4516				udp->uh_dport = port;
4517				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4518				udp->uh_sum = 0;
4519				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4520			} else {
4521				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4522			}
4523
4524			sctphdr->src_port = src_port;
4525			sctphdr->dest_port = dest_port;
4526			sctphdr->v_tag = v_tag;
4527			sctphdr->checksum = 0;
4528
4529			/*
4530			 * We set the hop limit now since there is a good
4531			 * chance that our ro pointer is now filled
4532			 */
4533			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4534			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4535
4536#ifdef SCTP_DEBUG
4537			/* Copy to be sure something bad is not happening */
4538			sin6->sin6_addr = ip6h->ip6_dst;
4539			lsa6->sin6_addr = ip6h->ip6_src;
4540#endif
4541
4542			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4543			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4544			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4545			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4546			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4547			if (net) {
4548				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4549				/*
4550				 * preserve the port and scope for link
4551				 * local send
4552				 */
4553				prev_scope = sin6->sin6_scope_id;
4554				prev_port = sin6->sin6_port;
4555			}
4556			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4557				/* failed to prepend data, give up */
4558				sctp_m_freem(m);
4559				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4560				return (ENOMEM);
4561			}
4562			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4563			if (port) {
4564#if defined(SCTP_WITH_NO_CSUM)
4565				SCTP_STAT_INCR(sctps_sendnocrc);
4566#else
4567				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4568				SCTP_STAT_INCR(sctps_sendswcrc);
4569#endif
4570				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4571					udp->uh_sum = 0xffff;
4572				}
4573			} else {
4574#if defined(SCTP_WITH_NO_CSUM)
4575				SCTP_STAT_INCR(sctps_sendnocrc);
4576#else
4577				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4578				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4579				SCTP_STAT_INCR(sctps_sendhwcrc);
4580#endif
4581			}
4582			/* send it out. table id is taken from stcb */
4583#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4584			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4585				so = SCTP_INP_SO(inp);
4586				SCTP_SOCKET_UNLOCK(so, 0);
4587			}
4588#endif
4589#ifdef SCTP_PACKET_LOGGING
4590			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4591				sctp_packet_log(o_pak);
4592#endif
4593			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4594#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4595			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4596				atomic_add_int(&stcb->asoc.refcnt, 1);
4597				SCTP_TCB_UNLOCK(stcb);
4598				SCTP_SOCKET_LOCK(so, 0);
4599				SCTP_TCB_LOCK(stcb);
4600				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4601			}
4602#endif
4603			if (net) {
4604				/* for link local this must be done */
4605				sin6->sin6_scope_id = prev_scope;
4606				sin6->sin6_port = prev_port;
4607			}
4608			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4609			SCTP_STAT_INCR(sctps_sendpackets);
4610			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4611			if (ret) {
4612				SCTP_STAT_INCR(sctps_senderrors);
4613			}
4614			if (net == NULL) {
4615				/* Now if we had a temp route free it */
4616				RO_RTFREE(ro);
4617			} else {
4618				/*
4619				 * PMTU check versus smallest asoc MTU goes
4620				 * here
4621				 */
4622				if (ro->ro_rt == NULL) {
4623					/* Route was freed */
4624					if (net->ro._s_addr &&
4625					    net->src_addr_selected) {
4626						sctp_free_ifa(net->ro._s_addr);
4627						net->ro._s_addr = NULL;
4628					}
4629					net->src_addr_selected = 0;
4630				}
4631				if ((ro->ro_rt != NULL) &&
4632				    (net->ro._s_addr)) {
4633					uint32_t mtu;
4634
4635					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4636					if (mtu &&
4637					    (stcb->asoc.smallest_mtu > mtu)) {
4638						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4639						net->mtu = mtu;
4640						if (net->port) {
4641							net->mtu -= sizeof(struct udphdr);
4642						}
4643					}
4644				} else if (ifp) {
4645					if (ND_IFINFO(ifp)->linkmtu &&
4646					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4647						sctp_mtu_size_reset(inp,
4648						    &stcb->asoc,
4649						    ND_IFINFO(ifp)->linkmtu);
4650					}
4651				}
4652			}
4653			return (ret);
4654		}
4655#endif
4656	default:
4657		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4658		    ((struct sockaddr *)to)->sa_family);
4659		sctp_m_freem(m);
4660		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4661		return (EFAULT);
4662	}
4663}
4664
4665
4666void
4667sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4668#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4669    SCTP_UNUSED
4670#endif
4671)
4672{
4673	struct mbuf *m, *m_last;
4674	struct sctp_nets *net;
4675	struct sctp_init_chunk *init;
4676	struct sctp_supported_addr_param *sup_addr;
4677	struct sctp_adaptation_layer_indication *ali;
4678	struct sctp_supported_chunk_types_param *pr_supported;
4679	struct sctp_paramhdr *ph;
4680	int cnt_inits_to = 0;
4681	int error;
4682	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4683
4684	/* INIT's always go to the primary (and usually ONLY address) */
4685	net = stcb->asoc.primary_destination;
4686	if (net == NULL) {
4687		net = TAILQ_FIRST(&stcb->asoc.nets);
4688		if (net == NULL) {
4689			/* TSNH */
4690			return;
4691		}
4692		/* we confirm any address we send an INIT to */
4693		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4694		(void)sctp_set_primary_addr(stcb, NULL, net);
4695	} else {
4696		/* we confirm any address we send an INIT to */
4697		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4698	}
4699	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4700#ifdef INET6
4701	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4702		/*
4703		 * special hook, if we are sending to link local it will not
4704		 * show up in our private address count.
4705		 */
4706		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4707			cnt_inits_to = 1;
4708	}
4709#endif
4710	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4711		/* This case should not happen */
4712		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4713		return;
4714	}
4715	/* start the INIT timer */
4716	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4717
4718	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4719	if (m == NULL) {
4720		/* No memory, INIT timer will re-attempt. */
4721		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4722		return;
4723	}
4724	chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4725	padding_len = 0;
4726	/* Now lets put the chunk header in place */
4727	init = mtod(m, struct sctp_init_chunk *);
4728	/* now the chunk header */
4729	init->ch.chunk_type = SCTP_INITIATION;
4730	init->ch.chunk_flags = 0;
4731	/* fill in later from mbuf we build */
4732	init->ch.chunk_length = 0;
4733	/* place in my tag */
4734	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4735	/* set up some of the credits. */
4736	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4737	    SCTP_MINIMAL_RWND));
4738	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4739	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4740	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4741
4742	/* Adaptation layer indication parameter */
4743	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4744		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4745		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4746		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4747		ali->ph.param_length = htons(parameter_len);
4748		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4749		chunk_len += parameter_len;
4750	}
4751	/* ECN parameter */
4752	if (stcb->asoc.ecn_supported == 1) {
4753		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4754		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4755		ph->param_type = htons(SCTP_ECN_CAPABLE);
4756		ph->param_length = htons(parameter_len);
4757		chunk_len += parameter_len;
4758	}
4759	/* PR-SCTP supported parameter */
4760	if (stcb->asoc.prsctp_supported == 1) {
4761		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4762		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4763		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4764		ph->param_length = htons(parameter_len);
4765		chunk_len += parameter_len;
4766	}
4767	/* Add NAT friendly parameter. */
4768	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4769		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4772		ph->param_length = htons(parameter_len);
4773		chunk_len += parameter_len;
4774	}
4775	/* And now tell the peer which extensions we support */
4776	num_ext = 0;
4777	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4778	if (stcb->asoc.prsctp_supported == 1) {
4779		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4780		if (stcb->asoc.idata_supported) {
4781			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4782		}
4783	}
4784	if (stcb->asoc.auth_supported == 1) {
4785		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4786	}
4787	if (stcb->asoc.asconf_supported == 1) {
4788		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4789		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4790	}
4791	if (stcb->asoc.reconfig_supported == 1) {
4792		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4793	}
4794	if (stcb->asoc.idata_supported) {
4795		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4796	}
4797	if (stcb->asoc.nrsack_supported == 1) {
4798		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4799	}
4800	if (stcb->asoc.pktdrop_supported == 1) {
4801		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4802	}
4803	if (num_ext > 0) {
4804		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4805		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4806		pr_supported->ph.param_length = htons(parameter_len);
4807		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4808		chunk_len += parameter_len;
4809	}
4810	/* add authentication parameters */
4811	if (stcb->asoc.auth_supported) {
4812		/* attach RANDOM parameter, if available */
4813		if (stcb->asoc.authinfo.random != NULL) {
4814			struct sctp_auth_random *randp;
4815
4816			if (padding_len > 0) {
4817				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4818				chunk_len += padding_len;
4819				padding_len = 0;
4820			}
4821			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4822			parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4823			/* random key already contains the header */
4824			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4825			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4826			chunk_len += parameter_len;
4827		}
4828		/* add HMAC_ALGO parameter */
4829		if (stcb->asoc.local_hmacs != NULL) {
4830			struct sctp_auth_hmac_algo *hmacs;
4831
4832			if (padding_len > 0) {
4833				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4834				chunk_len += padding_len;
4835				padding_len = 0;
4836			}
4837			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4838			parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4839			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4840			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4841			hmacs->ph.param_length = htons(parameter_len);
4842			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4843			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4844			chunk_len += parameter_len;
4845		}
4846		/* add CHUNKS parameter */
4847		if (stcb->asoc.local_auth_chunks != NULL) {
4848			struct sctp_auth_chunk_list *chunks;
4849
4850			if (padding_len > 0) {
4851				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4852				chunk_len += padding_len;
4853				padding_len = 0;
4854			}
4855			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4856			parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4857			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4858			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4859			chunks->ph.param_length = htons(parameter_len);
4860			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4861			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4862			chunk_len += parameter_len;
4863		}
4864	}
4865	/* now any cookie time extensions */
4866	if (stcb->asoc.cookie_preserve_req) {
4867		struct sctp_cookie_perserve_param *cookie_preserve;
4868
4869		if (padding_len > 0) {
4870			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871			chunk_len += padding_len;
4872			padding_len = 0;
4873		}
4874		parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4875		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4876		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4877		cookie_preserve->ph.param_length = htons(parameter_len);
4878		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4879		stcb->asoc.cookie_preserve_req = 0;
4880		chunk_len += parameter_len;
4881	}
4882	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4883		uint8_t i;
4884
4885		if (padding_len > 0) {
4886			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4887			chunk_len += padding_len;
4888			padding_len = 0;
4889		}
4890		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4891		if (stcb->asoc.scope.ipv4_addr_legal) {
4892			parameter_len += (uint16_t)sizeof(uint16_t);
4893		}
4894		if (stcb->asoc.scope.ipv6_addr_legal) {
4895			parameter_len += (uint16_t)sizeof(uint16_t);
4896		}
4897		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4898		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4899		sup_addr->ph.param_length = htons(parameter_len);
4900		i = 0;
4901		if (stcb->asoc.scope.ipv4_addr_legal) {
4902			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4903		}
4904		if (stcb->asoc.scope.ipv6_addr_legal) {
4905			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4906		}
4907		padding_len = 4 - 2 * i;
4908		chunk_len += parameter_len;
4909	}
4910	SCTP_BUF_LEN(m) = chunk_len;
4911	/* now the addresses */
4912	/*
4913	 * To optimize this we could put the scoping stuff into a structure
4914	 * and remove the individual uint8's from the assoc structure. Then
4915	 * we could just sifa in the address within the stcb. But for now
4916	 * this is a quick hack to get the address stuff teased apart.
4917	 */
4918	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4919	    m, cnt_inits_to,
4920	    &padding_len, &chunk_len);
4921
4922	init->ch.chunk_length = htons(chunk_len);
4923	if (padding_len > 0) {
4924		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4925			sctp_m_freem(m);
4926			return;
4927		}
4928	}
4929	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4930	if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4931	    (struct sockaddr *)&net->ro._l_addr,
4932	    m, 0, NULL, 0, 0, 0, 0,
4933	    inp->sctp_lport, stcb->rport, htonl(0),
4934	    net->port, NULL,
4935	    0, 0,
4936	    so_locked))) {
4937		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4938		if (error == ENOBUFS) {
4939			stcb->asoc.ifp_had_enobuf = 1;
4940			SCTP_STAT_INCR(sctps_lowlevelerr);
4941		}
4942	} else {
4943		stcb->asoc.ifp_had_enobuf = 0;
4944	}
4945	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4946	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4947}
4948
4949struct mbuf *
4950sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4951    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4952{
4953	/*
4954	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4955	 * being equal to the beginning of the params i.e. (iphlen +
4956	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4957	 * end of the mbuf verifying that all parameters are known.
4958	 *
4959	 * For unknown parameters build and return a mbuf with
4960	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4961	 * processing this chunk stop, and set *abort_processing to 1.
4962	 *
4963	 * By having param_offset be pre-set to where parameters begin it is
4964	 * hoped that this routine may be reused in the future by new
4965	 * features.
4966	 */
4967	struct sctp_paramhdr *phdr, params;
4968
4969	struct mbuf *mat, *op_err;
4970	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4971	int at, limit, pad_needed;
4972	uint16_t ptype, plen, padded_size;
4973	int err_at;
4974
4975	*abort_processing = 0;
4976	mat = in_initpkt;
4977	err_at = 0;
4978	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4979	at = param_offset;
4980	op_err = NULL;
4981	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4982	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4983	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4984		ptype = ntohs(phdr->param_type);
4985		plen = ntohs(phdr->param_length);
4986		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4987			/* wacked parameter */
4988			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4989			goto invalid_size;
4990		}
4991		limit -= SCTP_SIZE32(plen);
4992		/*-
4993		 * All parameters for all chunks that we know/understand are
4994		 * listed here. We process them other places and make
4995		 * appropriate stop actions per the upper bits. However this
4996		 * is the generic routine processor's can call to get back
4997		 * an operr.. to either incorporate (init-ack) or send.
4998		 */
4999		padded_size = SCTP_SIZE32(plen);
5000		switch (ptype) {
5001			/* Param's with variable size */
5002		case SCTP_HEARTBEAT_INFO:
5003		case SCTP_STATE_COOKIE:
5004		case SCTP_UNRECOG_PARAM:
5005		case SCTP_ERROR_CAUSE_IND:
5006			/* ok skip fwd */
5007			at += padded_size;
5008			break;
5009			/* Param's with variable size within a range */
5010		case SCTP_CHUNK_LIST:
5011		case SCTP_SUPPORTED_CHUNK_EXT:
5012			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5013				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5014				goto invalid_size;
5015			}
5016			at += padded_size;
5017			break;
5018		case SCTP_SUPPORTED_ADDRTYPE:
5019			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5020				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5021				goto invalid_size;
5022			}
5023			at += padded_size;
5024			break;
5025		case SCTP_RANDOM:
5026			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5027				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5028				goto invalid_size;
5029			}
5030			at += padded_size;
5031			break;
5032		case SCTP_SET_PRIM_ADDR:
5033		case SCTP_DEL_IP_ADDRESS:
5034		case SCTP_ADD_IP_ADDRESS:
5035			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5036			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5037				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5038				goto invalid_size;
5039			}
5040			at += padded_size;
5041			break;
5042			/* Param's with a fixed size */
5043		case SCTP_IPV4_ADDRESS:
5044			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5045				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5046				goto invalid_size;
5047			}
5048			at += padded_size;
5049			break;
5050		case SCTP_IPV6_ADDRESS:
5051			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5052				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5053				goto invalid_size;
5054			}
5055			at += padded_size;
5056			break;
5057		case SCTP_COOKIE_PRESERVE:
5058			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5059				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5060				goto invalid_size;
5061			}
5062			at += padded_size;
5063			break;
5064		case SCTP_HAS_NAT_SUPPORT:
5065			*nat_friendly = 1;
5066			/* fall through */
5067		case SCTP_PRSCTP_SUPPORTED:
5068			if (padded_size != sizeof(struct sctp_paramhdr)) {
5069				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5070				goto invalid_size;
5071			}
5072			at += padded_size;
5073			break;
5074		case SCTP_ECN_CAPABLE:
5075			if (padded_size != sizeof(struct sctp_paramhdr)) {
5076				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5077				goto invalid_size;
5078			}
5079			at += padded_size;
5080			break;
5081		case SCTP_ULP_ADAPTATION:
5082			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5083				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5084				goto invalid_size;
5085			}
5086			at += padded_size;
5087			break;
5088		case SCTP_SUCCESS_REPORT:
5089			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5090				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5091				goto invalid_size;
5092			}
5093			at += padded_size;
5094			break;
5095		case SCTP_HOSTNAME_ADDRESS:
5096			{
5097				/* We can NOT handle HOST NAME addresses!! */
5098				int l_len;
5099
5100				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5101				*abort_processing = 1;
5102				if (op_err == NULL) {
5103					/* Ok need to try to get a mbuf */
5104#ifdef INET6
5105					l_len = SCTP_MIN_OVERHEAD;
5106#else
5107					l_len = SCTP_MIN_V4_OVERHEAD;
5108#endif
5109					l_len += sizeof(struct sctp_chunkhdr);
5110					l_len += plen;
5111					l_len += sizeof(struct sctp_paramhdr);
5112					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5113					if (op_err) {
5114						SCTP_BUF_LEN(op_err) = 0;
5115						/*
5116						 * pre-reserve space for ip
5117						 * and sctp header  and
5118						 * chunk hdr
5119						 */
5120#ifdef INET6
5121						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5122#else
5123						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5124#endif
5125						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5126						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5127					}
5128				}
5129				if (op_err) {
5130					/* If we have space */
5131					struct sctp_paramhdr s;
5132
5133					if (err_at % 4) {
5134						uint32_t cpthis = 0;
5135
5136						pad_needed = 4 - (err_at % 4);
5137						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5138						err_at += pad_needed;
5139					}
5140					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5141					s.param_length = htons(sizeof(s) + plen);
5142					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5143					err_at += sizeof(s);
5144					if (plen > sizeof(tempbuf)) {
5145						plen = sizeof(tempbuf);
5146					}
5147					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5148					if (phdr == NULL) {
5149						sctp_m_freem(op_err);
5150						/*
5151						 * we are out of memory but
5152						 * we still need to have a
5153						 * look at what to do (the
5154						 * system is in trouble
5155						 * though).
5156						 */
5157						return (NULL);
5158					}
5159					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5160				}
5161				return (op_err);
5162				break;
5163			}
5164		default:
5165			/*
5166			 * we do not recognize the parameter figure out what
5167			 * we do.
5168			 */
5169			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5170			if ((ptype & 0x4000) == 0x4000) {
5171				/* Report bit is set?? */
5172				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5173				if (op_err == NULL) {
5174					int l_len;
5175
5176					/* Ok need to try to get an mbuf */
5177#ifdef INET6
5178					l_len = SCTP_MIN_OVERHEAD;
5179#else
5180					l_len = SCTP_MIN_V4_OVERHEAD;
5181#endif
5182					l_len += sizeof(struct sctp_chunkhdr);
5183					l_len += plen;
5184					l_len += sizeof(struct sctp_paramhdr);
5185					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5186					if (op_err) {
5187						SCTP_BUF_LEN(op_err) = 0;
5188#ifdef INET6
5189						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5190#else
5191						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5192#endif
5193						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5194						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5195					}
5196				}
5197				if (op_err) {
5198					/* If we have space */
5199					struct sctp_paramhdr s;
5200
5201					if (err_at % 4) {
5202						uint32_t cpthis = 0;
5203
5204						pad_needed = 4 - (err_at % 4);
5205						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5206						err_at += pad_needed;
5207					}
5208					s.param_type = htons(SCTP_UNRECOG_PARAM);
5209					s.param_length = htons(sizeof(s) + plen);
5210					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5211					err_at += sizeof(s);
5212					if (plen > sizeof(tempbuf)) {
5213						plen = sizeof(tempbuf);
5214					}
5215					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5216					if (phdr == NULL) {
5217						sctp_m_freem(op_err);
5218						/*
5219						 * we are out of memory but
5220						 * we still need to have a
5221						 * look at what to do (the
5222						 * system is in trouble
5223						 * though).
5224						 */
5225						op_err = NULL;
5226						goto more_processing;
5227					}
5228					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5229					err_at += plen;
5230				}
5231			}
5232	more_processing:
5233			if ((ptype & 0x8000) == 0x0000) {
5234				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5235				return (op_err);
5236			} else {
5237				/* skip this chunk and continue processing */
5238				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5239				at += SCTP_SIZE32(plen);
5240			}
5241			break;
5242
5243		}
5244		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5245	}
5246	return (op_err);
5247invalid_size:
5248	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5249	*abort_processing = 1;
5250	if ((op_err == NULL) && phdr) {
5251		int l_len;
5252#ifdef INET6
5253		l_len = SCTP_MIN_OVERHEAD;
5254#else
5255		l_len = SCTP_MIN_V4_OVERHEAD;
5256#endif
5257		l_len += sizeof(struct sctp_chunkhdr);
5258		l_len += (2 * sizeof(struct sctp_paramhdr));
5259		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5260		if (op_err) {
5261			SCTP_BUF_LEN(op_err) = 0;
5262#ifdef INET6
5263			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5264#else
5265			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5266#endif
5267			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5268			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5269		}
5270	}
5271	if ((op_err) && phdr) {
5272		struct sctp_paramhdr s;
5273
5274		if (err_at % 4) {
5275			uint32_t cpthis = 0;
5276
5277			pad_needed = 4 - (err_at % 4);
5278			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5279			err_at += pad_needed;
5280		}
5281		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5282		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5283		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5284		err_at += sizeof(s);
5285		/* Only copy back the p-hdr that caused the issue */
5286		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5287	}
5288	return (op_err);
5289}
5290
5291static int
5292sctp_are_there_new_addresses(struct sctp_association *asoc,
5293    struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5294{
5295	/*
5296	 * Given a INIT packet, look through the packet to verify that there
5297	 * are NO new addresses. As we go through the parameters add reports
5298	 * of any un-understood parameters that require an error.  Also we
5299	 * must return (1) to drop the packet if we see a un-understood
5300	 * parameter that tells us to drop the chunk.
5301	 */
5302	struct sockaddr *sa_touse;
5303	struct sockaddr *sa;
5304	struct sctp_paramhdr *phdr, params;
5305	uint16_t ptype, plen;
5306	uint8_t fnd;
5307	struct sctp_nets *net;
5308	int check_src;
5309#ifdef INET
5310	struct sockaddr_in sin4, *sa4;
5311#endif
5312#ifdef INET6
5313	struct sockaddr_in6 sin6, *sa6;
5314#endif
5315
5316#ifdef INET
5317	memset(&sin4, 0, sizeof(sin4));
5318	sin4.sin_family = AF_INET;
5319	sin4.sin_len = sizeof(sin4);
5320#endif
5321#ifdef INET6
5322	memset(&sin6, 0, sizeof(sin6));
5323	sin6.sin6_family = AF_INET6;
5324	sin6.sin6_len = sizeof(sin6);
5325#endif
5326	/* First what about the src address of the pkt ? */
5327	check_src = 0;
5328	switch (src->sa_family) {
5329#ifdef INET
5330	case AF_INET:
5331		if (asoc->scope.ipv4_addr_legal) {
5332			check_src = 1;
5333		}
5334		break;
5335#endif
5336#ifdef INET6
5337	case AF_INET6:
5338		if (asoc->scope.ipv6_addr_legal) {
5339			check_src = 1;
5340		}
5341		break;
5342#endif
5343	default:
5344		/* TSNH */
5345		break;
5346	}
5347	if (check_src) {
5348		fnd = 0;
5349		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5350			sa = (struct sockaddr *)&net->ro._l_addr;
5351			if (sa->sa_family == src->sa_family) {
5352#ifdef INET
5353				if (sa->sa_family == AF_INET) {
5354					struct sockaddr_in *src4;
5355
5356					sa4 = (struct sockaddr_in *)sa;
5357					src4 = (struct sockaddr_in *)src;
5358					if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5359						fnd = 1;
5360						break;
5361					}
5362				}
5363#endif
5364#ifdef INET6
5365				if (sa->sa_family == AF_INET6) {
5366					struct sockaddr_in6 *src6;
5367
5368					sa6 = (struct sockaddr_in6 *)sa;
5369					src6 = (struct sockaddr_in6 *)src;
5370					if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5371						fnd = 1;
5372						break;
5373					}
5374				}
5375#endif
5376			}
5377		}
5378		if (fnd == 0) {
5379			/* New address added! no need to look further. */
5380			return (1);
5381		}
5382	}
5383	/* Ok so far lets munge through the rest of the packet */
5384	offset += sizeof(struct sctp_init_chunk);
5385	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5386	while (phdr) {
5387		sa_touse = NULL;
5388		ptype = ntohs(phdr->param_type);
5389		plen = ntohs(phdr->param_length);
5390		switch (ptype) {
5391#ifdef INET
5392		case SCTP_IPV4_ADDRESS:
5393			{
5394				struct sctp_ipv4addr_param *p4, p4_buf;
5395
5396				if (plen != sizeof(struct sctp_ipv4addr_param)) {
5397					return (1);
5398				}
5399				phdr = sctp_get_next_param(in_initpkt, offset,
5400				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5401				if (phdr == NULL) {
5402					return (1);
5403				}
5404				if (asoc->scope.ipv4_addr_legal) {
5405					p4 = (struct sctp_ipv4addr_param *)phdr;
5406					sin4.sin_addr.s_addr = p4->addr;
5407					sa_touse = (struct sockaddr *)&sin4;
5408				}
5409				break;
5410			}
5411#endif
5412#ifdef INET6
5413		case SCTP_IPV6_ADDRESS:
5414			{
5415				struct sctp_ipv6addr_param *p6, p6_buf;
5416
5417				if (plen != sizeof(struct sctp_ipv6addr_param)) {
5418					return (1);
5419				}
5420				phdr = sctp_get_next_param(in_initpkt, offset,
5421				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5422				if (phdr == NULL) {
5423					return (1);
5424				}
5425				if (asoc->scope.ipv6_addr_legal) {
5426					p6 = (struct sctp_ipv6addr_param *)phdr;
5427					memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5428					    sizeof(p6->addr));
5429					sa_touse = (struct sockaddr *)&sin6;
5430				}
5431				break;
5432			}
5433#endif
5434		default:
5435			sa_touse = NULL;
5436			break;
5437		}
5438		if (sa_touse) {
5439			/* ok, sa_touse points to one to check */
5440			fnd = 0;
5441			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5442				sa = (struct sockaddr *)&net->ro._l_addr;
5443				if (sa->sa_family != sa_touse->sa_family) {
5444					continue;
5445				}
5446#ifdef INET
5447				if (sa->sa_family == AF_INET) {
5448					sa4 = (struct sockaddr_in *)sa;
5449					if (sa4->sin_addr.s_addr ==
5450					    sin4.sin_addr.s_addr) {
5451						fnd = 1;
5452						break;
5453					}
5454				}
5455#endif
5456#ifdef INET6
5457				if (sa->sa_family == AF_INET6) {
5458					sa6 = (struct sockaddr_in6 *)sa;
5459					if (SCTP6_ARE_ADDR_EQUAL(
5460					    sa6, &sin6)) {
5461						fnd = 1;
5462						break;
5463					}
5464				}
5465#endif
5466			}
5467			if (!fnd) {
5468				/* New addr added! no need to look further */
5469				return (1);
5470			}
5471		}
5472		offset += SCTP_SIZE32(plen);
5473		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5474	}
5475	return (0);
5476}
5477
5478/*
5479 * Given a MBUF chain that was sent into us containing an INIT. Build a
5480 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5481 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5482 * message (i.e. the struct sctp_init_msg).
5483 */
5484void
5485sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5486    struct sctp_nets *src_net, struct mbuf *init_pkt,
5487    int iphlen, int offset,
5488    struct sockaddr *src, struct sockaddr *dst,
5489    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5490    uint8_t mflowtype, uint32_t mflowid,
5491    uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5492{
5493	struct sctp_association *asoc;
5494	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5495	struct sctp_init_ack_chunk *initack;
5496	struct sctp_adaptation_layer_indication *ali;
5497	struct sctp_supported_chunk_types_param *pr_supported;
5498	struct sctp_paramhdr *ph;
5499	union sctp_sockstore *over_addr;
5500	struct sctp_scoping scp;
5501#ifdef INET
5502	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5503	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5504	struct sockaddr_in *sin;
5505#endif
5506#ifdef INET6
5507	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5508	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5509	struct sockaddr_in6 *sin6;
5510#endif
5511	struct sockaddr *to;
5512	struct sctp_state_cookie stc;
5513	struct sctp_nets *net = NULL;
5514	uint8_t *signature = NULL;
5515	int cnt_inits_to = 0;
5516	uint16_t his_limit, i_want;
5517	int abort_flag;
5518	int nat_friendly = 0;
5519	int error;
5520	struct socket *so;
5521	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5522
5523	if (stcb) {
5524		asoc = &stcb->asoc;
5525	} else {
5526		asoc = NULL;
5527	}
5528	if ((asoc != NULL) &&
5529	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5530		if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5531			/*
5532			 * new addresses, out of here in non-cookie-wait
5533			 * states
5534			 *
5535			 * Send an ABORT, without the new address error
5536			 * cause. This looks no different than if no
5537			 * listener was present.
5538			 */
5539			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5540			    "Address added");
5541			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5542			    mflowtype, mflowid, inp->fibnum,
5543			    vrf_id, port);
5544			return;
5545		}
5546		if (src_net != NULL && (src_net->port != port)) {
5547			/*
5548			 * change of remote encapsulation port, out of here
5549			 * in non-cookie-wait states
5550			 *
5551			 * Send an ABORT, without an specific error cause.
5552			 * This looks no different than if no listener was
5553			 * present.
5554			 */
5555			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556			    "Remote encapsulation port changed");
5557			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5558			    mflowtype, mflowid, inp->fibnum,
5559			    vrf_id, port);
5560			return;
5561		}
5562	}
5563	abort_flag = 0;
5564	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5565	    (offset + sizeof(struct sctp_init_chunk)),
5566	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5567	if (abort_flag) {
5568do_a_abort:
5569		if (op_err == NULL) {
5570			char msg[SCTP_DIAG_INFO_LEN];
5571
5572			snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5573			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5574			    msg);
5575		}
5576		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5577		    init_chk->init.initiate_tag, op_err,
5578		    mflowtype, mflowid, inp->fibnum,
5579		    vrf_id, port);
5580		return;
5581	}
5582	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5583	if (m == NULL) {
5584		/* No memory, INIT timer will re-attempt. */
5585		if (op_err)
5586			sctp_m_freem(op_err);
5587		return;
5588	}
5589	chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5590	padding_len = 0;
5591
5592	/*
5593	 * We might not overwrite the identification[] completely and on
5594	 * some platforms time_entered will contain some padding. Therefore
5595	 * zero out the cookie to avoid putting uninitialized memory on the
5596	 * wire.
5597	 */
5598	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5599
5600	/* the time I built cookie */
5601	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5602
5603	/* populate any tie tags */
5604	if (asoc != NULL) {
5605		/* unlock before tag selections */
5606		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5607		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5608		stc.cookie_life = asoc->cookie_life;
5609		net = asoc->primary_destination;
5610	} else {
5611		stc.tie_tag_my_vtag = 0;
5612		stc.tie_tag_peer_vtag = 0;
5613		/* life I will award this cookie */
5614		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5615	}
5616
5617	/* copy in the ports for later check */
5618	stc.myport = sh->dest_port;
5619	stc.peerport = sh->src_port;
5620
5621	/*
5622	 * If we wanted to honor cookie life extensions, we would add to
5623	 * stc.cookie_life. For now we should NOT honor any extension
5624	 */
5625	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5626	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5627		stc.ipv6_addr_legal = 1;
5628		if (SCTP_IPV6_V6ONLY(inp)) {
5629			stc.ipv4_addr_legal = 0;
5630		} else {
5631			stc.ipv4_addr_legal = 1;
5632		}
5633	} else {
5634		stc.ipv6_addr_legal = 0;
5635		stc.ipv4_addr_legal = 1;
5636	}
5637	stc.ipv4_scope = 0;
5638	if (net == NULL) {
5639		to = src;
5640		switch (dst->sa_family) {
5641#ifdef INET
5642		case AF_INET:
5643			{
5644				/* lookup address */
5645				stc.address[0] = src4->sin_addr.s_addr;
5646				stc.address[1] = 0;
5647				stc.address[2] = 0;
5648				stc.address[3] = 0;
5649				stc.addr_type = SCTP_IPV4_ADDRESS;
5650				/* local from address */
5651				stc.laddress[0] = dst4->sin_addr.s_addr;
5652				stc.laddress[1] = 0;
5653				stc.laddress[2] = 0;
5654				stc.laddress[3] = 0;
5655				stc.laddr_type = SCTP_IPV4_ADDRESS;
5656				/* scope_id is only for v6 */
5657				stc.scope_id = 0;
5658				if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5659				    (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5660					stc.ipv4_scope = 1;
5661				}
5662				/* Must use the address in this case */
5663				if (sctp_is_address_on_local_host(src, vrf_id)) {
5664					stc.loopback_scope = 1;
5665					stc.ipv4_scope = 1;
5666					stc.site_scope = 1;
5667					stc.local_scope = 0;
5668				}
5669				break;
5670			}
5671#endif
5672#ifdef INET6
5673		case AF_INET6:
5674			{
5675				stc.addr_type = SCTP_IPV6_ADDRESS;
5676				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5677				stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5678				if (sctp_is_address_on_local_host(src, vrf_id)) {
5679					stc.loopback_scope = 1;
5680					stc.local_scope = 0;
5681					stc.site_scope = 1;
5682					stc.ipv4_scope = 1;
5683				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5684				    IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5685					/*
5686					 * If the new destination or source
5687					 * is a LINK_LOCAL we must have
5688					 * common both site and local scope.
5689					 * Don't set local scope though
5690					 * since we must depend on the
5691					 * source to be added implicitly. We
5692					 * cannot assure just because we
5693					 * share one link that all links are
5694					 * common.
5695					 */
5696					stc.local_scope = 0;
5697					stc.site_scope = 1;
5698					stc.ipv4_scope = 1;
5699					/*
5700					 * we start counting for the private
5701					 * address stuff at 1. since the
5702					 * link local we source from won't
5703					 * show up in our scoped count.
5704					 */
5705					cnt_inits_to = 1;
5706					/*
5707					 * pull out the scope_id from
5708					 * incoming pkt
5709					 */
5710				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5711				    IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5712					/*
5713					 * If the new destination or source
5714					 * is SITE_LOCAL then we must have
5715					 * site scope in common.
5716					 */
5717					stc.site_scope = 1;
5718				}
5719				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5720				stc.laddr_type = SCTP_IPV6_ADDRESS;
5721				break;
5722			}
5723#endif
5724		default:
5725			/* TSNH */
5726			goto do_a_abort;
5727			break;
5728		}
5729	} else {
5730		/* set the scope per the existing tcb */
5731
5732#ifdef INET6
5733		struct sctp_nets *lnet;
5734#endif
5735
5736		stc.loopback_scope = asoc->scope.loopback_scope;
5737		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5738		stc.site_scope = asoc->scope.site_scope;
5739		stc.local_scope = asoc->scope.local_scope;
5740#ifdef INET6
5741		/* Why do we not consider IPv4 LL addresses? */
5742		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5743			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5744				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5745					/*
5746					 * if we have a LL address, start
5747					 * counting at 1.
5748					 */
5749					cnt_inits_to = 1;
5750				}
5751			}
5752		}
5753#endif
5754		/* use the net pointer */
5755		to = (struct sockaddr *)&net->ro._l_addr;
5756		switch (to->sa_family) {
5757#ifdef INET
5758		case AF_INET:
5759			sin = (struct sockaddr_in *)to;
5760			stc.address[0] = sin->sin_addr.s_addr;
5761			stc.address[1] = 0;
5762			stc.address[2] = 0;
5763			stc.address[3] = 0;
5764			stc.addr_type = SCTP_IPV4_ADDRESS;
5765			if (net->src_addr_selected == 0) {
5766				/*
5767				 * strange case here, the INIT should have
5768				 * did the selection.
5769				 */
5770				net->ro._s_addr = sctp_source_address_selection(inp,
5771				    stcb, (sctp_route_t *)&net->ro,
5772				    net, 0, vrf_id);
5773				if (net->ro._s_addr == NULL)
5774					return;
5775
5776				net->src_addr_selected = 1;
5777
5778			}
5779			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5780			stc.laddress[1] = 0;
5781			stc.laddress[2] = 0;
5782			stc.laddress[3] = 0;
5783			stc.laddr_type = SCTP_IPV4_ADDRESS;
5784			/* scope_id is only for v6 */
5785			stc.scope_id = 0;
5786			break;
5787#endif
5788#ifdef INET6
5789		case AF_INET6:
5790			sin6 = (struct sockaddr_in6 *)to;
5791			memcpy(&stc.address, &sin6->sin6_addr,
5792			    sizeof(struct in6_addr));
5793			stc.addr_type = SCTP_IPV6_ADDRESS;
5794			stc.scope_id = sin6->sin6_scope_id;
5795			if (net->src_addr_selected == 0) {
5796				/*
5797				 * strange case here, the INIT should have
5798				 * done the selection.
5799				 */
5800				net->ro._s_addr = sctp_source_address_selection(inp,
5801				    stcb, (sctp_route_t *)&net->ro,
5802				    net, 0, vrf_id);
5803				if (net->ro._s_addr == NULL)
5804					return;
5805
5806				net->src_addr_selected = 1;
5807			}
5808			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5809			    sizeof(struct in6_addr));
5810			stc.laddr_type = SCTP_IPV6_ADDRESS;
5811			break;
5812#endif
5813		}
5814	}
5815	/* Now lets put the SCTP header in place */
5816	initack = mtod(m, struct sctp_init_ack_chunk *);
5817	/* Save it off for quick ref */
5818	stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5819	/* who are we */
5820	memcpy(stc.identification, SCTP_VERSION_STRING,
5821	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5822	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5823	/* now the chunk header */
5824	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5825	initack->ch.chunk_flags = 0;
5826	/* fill in later from mbuf we build */
5827	initack->ch.chunk_length = 0;
5828	/* place in my tag */
5829	if ((asoc != NULL) &&
5830	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5831	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5832	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5833		/* re-use the v-tags and init-seq here */
5834		initack->init.initiate_tag = htonl(asoc->my_vtag);
5835		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5836	} else {
5837		uint32_t vtag, itsn;
5838
5839		if (hold_inp_lock) {
5840			SCTP_INP_INCR_REF(inp);
5841			SCTP_INP_RUNLOCK(inp);
5842		}
5843		if (asoc) {
5844			atomic_add_int(&asoc->refcnt, 1);
5845			SCTP_TCB_UNLOCK(stcb);
5846	new_tag:
5847			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5848			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5849				/*
5850				 * Got a duplicate vtag on some guy behind a
5851				 * nat make sure we don't use it.
5852				 */
5853				goto new_tag;
5854			}
5855			initack->init.initiate_tag = htonl(vtag);
5856			/* get a TSN to use too */
5857			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5858			initack->init.initial_tsn = htonl(itsn);
5859			SCTP_TCB_LOCK(stcb);
5860			atomic_add_int(&asoc->refcnt, -1);
5861		} else {
5862			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5863			initack->init.initiate_tag = htonl(vtag);
5864			/* get a TSN to use too */
5865			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5866		}
5867		if (hold_inp_lock) {
5868			SCTP_INP_RLOCK(inp);
5869			SCTP_INP_DECR_REF(inp);
5870		}
5871	}
5872	/* save away my tag to */
5873	stc.my_vtag = initack->init.initiate_tag;
5874
5875	/* set up some of the credits. */
5876	so = inp->sctp_socket;
5877	if (so == NULL) {
5878		/* memory problem */
5879		sctp_m_freem(m);
5880		return;
5881	} else {
5882		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5883	}
5884	/* set what I want */
5885	his_limit = ntohs(init_chk->init.num_inbound_streams);
5886	/* choose what I want */
5887	if (asoc != NULL) {
5888		if (asoc->streamoutcnt > asoc->pre_open_streams) {
5889			i_want = asoc->streamoutcnt;
5890		} else {
5891			i_want = asoc->pre_open_streams;
5892		}
5893	} else {
5894		i_want = inp->sctp_ep.pre_open_stream_count;
5895	}
5896	if (his_limit < i_want) {
5897		/* I Want more :< */
5898		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5899	} else {
5900		/* I can have what I want :> */
5901		initack->init.num_outbound_streams = htons(i_want);
5902	}
5903	/* tell him his limit. */
5904	initack->init.num_inbound_streams =
5905	    htons(inp->sctp_ep.max_open_streams_intome);
5906
5907	/* adaptation layer indication parameter */
5908	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5909		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5910		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5911		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5912		ali->ph.param_length = htons(parameter_len);
5913		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5914		chunk_len += parameter_len;
5915	}
5916	/* ECN parameter */
5917	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5918	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5919		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5920		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5921		ph->param_type = htons(SCTP_ECN_CAPABLE);
5922		ph->param_length = htons(parameter_len);
5923		chunk_len += parameter_len;
5924	}
5925	/* PR-SCTP supported parameter */
5926	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5927	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5928		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5929		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5930		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5931		ph->param_length = htons(parameter_len);
5932		chunk_len += parameter_len;
5933	}
5934	/* Add NAT friendly parameter */
5935	if (nat_friendly) {
5936		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5937		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5938		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5939		ph->param_length = htons(parameter_len);
5940		chunk_len += parameter_len;
5941	}
5942	/* And now tell the peer which extensions we support */
5943	num_ext = 0;
5944	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5945	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5946	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5947		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5948		if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5949		    ((asoc == NULL) && (inp->idata_supported == 1))) {
5950			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5951		}
5952	}
5953	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5954	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5955		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5956	}
5957	if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5958	    ((asoc == NULL) && (inp->asconf_supported == 1))) {
5959		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5960		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5961	}
5962	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5963	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5964		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5965	}
5966	if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5967	    ((asoc == NULL) && (inp->idata_supported == 1))) {
5968		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5969	}
5970	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5971	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5972		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5973	}
5974	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5975	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5976		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5977	}
5978	if (num_ext > 0) {
5979		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5980		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5981		pr_supported->ph.param_length = htons(parameter_len);
5982		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5983		chunk_len += parameter_len;
5984	}
5985	/* add authentication parameters */
5986	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5987	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5988		struct sctp_auth_random *randp;
5989		struct sctp_auth_hmac_algo *hmacs;
5990		struct sctp_auth_chunk_list *chunks;
5991
5992		if (padding_len > 0) {
5993			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5994			chunk_len += padding_len;
5995			padding_len = 0;
5996		}
5997		/* generate and add RANDOM parameter */
5998		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5999		parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6000		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6001		randp->ph.param_type = htons(SCTP_RANDOM);
6002		randp->ph.param_length = htons(parameter_len);
6003		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6004		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6005		chunk_len += parameter_len;
6006
6007		if (padding_len > 0) {
6008			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6009			chunk_len += padding_len;
6010			padding_len = 0;
6011		}
6012		/* add HMAC_ALGO parameter */
6013		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6014		parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6015		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6016		    (uint8_t *)hmacs->hmac_ids);
6017		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6018		hmacs->ph.param_length = htons(parameter_len);
6019		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6020		chunk_len += parameter_len;
6021
6022		if (padding_len > 0) {
6023			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6024			chunk_len += padding_len;
6025			padding_len = 0;
6026		}
6027		/* add CHUNKS parameter */
6028		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6029		parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6030		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6031		    chunks->chunk_types);
6032		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6033		chunks->ph.param_length = htons(parameter_len);
6034		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6035		chunk_len += parameter_len;
6036	}
6037	SCTP_BUF_LEN(m) = chunk_len;
6038	m_last = m;
6039	/* now the addresses */
6040	/*
6041	 * To optimize this we could put the scoping stuff into a structure
6042	 * and remove the individual uint8's from the stc structure. Then we
6043	 * could just sifa in the address within the stc.. but for now this
6044	 * is a quick hack to get the address stuff teased apart.
6045	 */
6046	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6047	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6048	scp.loopback_scope = stc.loopback_scope;
6049	scp.ipv4_local_scope = stc.ipv4_scope;
6050	scp.local_scope = stc.local_scope;
6051	scp.site_scope = stc.site_scope;
6052	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6053	    cnt_inits_to,
6054	    &padding_len, &chunk_len);
6055	/* padding_len can only be positive, if no addresses have been added */
6056	if (padding_len > 0) {
6057		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6058		chunk_len += padding_len;
6059		SCTP_BUF_LEN(m) += padding_len;
6060		padding_len = 0;
6061	}
6062	/* tack on the operational error if present */
6063	if (op_err) {
6064		parameter_len = 0;
6065		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6066			parameter_len += SCTP_BUF_LEN(m_tmp);
6067		}
6068		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6069		SCTP_BUF_NEXT(m_last) = op_err;
6070		while (SCTP_BUF_NEXT(m_last) != NULL) {
6071			m_last = SCTP_BUF_NEXT(m_last);
6072		}
6073		chunk_len += parameter_len;
6074	}
6075	if (padding_len > 0) {
6076		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6077		if (m_last == NULL) {
6078			/* Houston we have a problem, no space */
6079			sctp_m_freem(m);
6080			return;
6081		}
6082		chunk_len += padding_len;
6083		padding_len = 0;
6084	}
6085	/* Now we must build a cookie */
6086	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6087	if (m_cookie == NULL) {
6088		/* memory problem */
6089		sctp_m_freem(m);
6090		return;
6091	}
6092	/* Now append the cookie to the end and update the space/size */
6093	SCTP_BUF_NEXT(m_last) = m_cookie;
6094	parameter_len = 0;
6095	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6096		parameter_len += SCTP_BUF_LEN(m_tmp);
6097		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6098			m_last = m_tmp;
6099		}
6100	}
6101	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6102	chunk_len += parameter_len;
6103
6104	/*
6105	 * Place in the size, but we don't include the last pad (if any) in
6106	 * the INIT-ACK.
6107	 */
6108	initack->ch.chunk_length = htons(chunk_len);
6109
6110	/*
6111	 * Time to sign the cookie, we don't sign over the cookie signature
6112	 * though thus we set trailer.
6113	 */
6114	(void)sctp_hmac_m(SCTP_HMAC,
6115	    (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6116	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6117	    (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6118	/*
6119	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6120	 * here since the timer will drive a retranmission.
6121	 */
6122	if (padding_len > 0) {
6123		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6124			sctp_m_freem(m);
6125			return;
6126		}
6127	}
6128	if (stc.loopback_scope) {
6129		over_addr = (union sctp_sockstore *)dst;
6130	} else {
6131		over_addr = NULL;
6132	}
6133
6134	if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6135	    0, 0,
6136	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6137	    port, over_addr,
6138	    mflowtype, mflowid,
6139	    SCTP_SO_NOT_LOCKED))) {
6140		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6141		if (error == ENOBUFS) {
6142			if (asoc != NULL) {
6143				asoc->ifp_had_enobuf = 1;
6144			}
6145			SCTP_STAT_INCR(sctps_lowlevelerr);
6146		}
6147	} else {
6148		if (asoc != NULL) {
6149			asoc->ifp_had_enobuf = 0;
6150		}
6151	}
6152	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6153}
6154
6155
6156static void
6157sctp_prune_prsctp(struct sctp_tcb *stcb,
6158    struct sctp_association *asoc,
6159    struct sctp_sndrcvinfo *srcv,
6160    int dataout)
6161{
6162	int freed_spc = 0;
6163	struct sctp_tmit_chunk *chk, *nchk;
6164
6165	SCTP_TCB_LOCK_ASSERT(stcb);
6166	if ((asoc->prsctp_supported) &&
6167	    (asoc->sent_queue_cnt_removeable > 0)) {
6168		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6169			/*
6170			 * Look for chunks marked with the PR_SCTP flag AND
6171			 * the buffer space flag. If the one being sent is
6172			 * equal or greater priority then purge the old one
6173			 * and free some space.
6174			 */
6175			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6176				/*
6177				 * This one is PR-SCTP AND buffer space
6178				 * limited type
6179				 */
6180				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6181					/*
6182					 * Lower numbers equates to higher
6183					 * priority so if the one we are
6184					 * looking at has a larger or equal
6185					 * priority we want to drop the data
6186					 * and NOT retransmit it.
6187					 */
6188					if (chk->data) {
6189						/*
6190						 * We release the book_size
6191						 * if the mbuf is here
6192						 */
6193						int ret_spc;
6194						uint8_t sent;
6195
6196						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6197							sent = 1;
6198						else
6199							sent = 0;
6200						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6201						    sent,
6202						    SCTP_SO_LOCKED);
6203						freed_spc += ret_spc;
6204						if (freed_spc >= dataout) {
6205							return;
6206						}
6207					}	/* if chunk was present */
6208				}	/* if of sufficient priority */
6209			}	/* if chunk has enabled */
6210		}		/* tailqforeach */
6211
6212		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6213			/* Here we must move to the sent queue and mark */
6214			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6215				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6216					if (chk->data) {
6217						/*
6218						 * We release the book_size
6219						 * if the mbuf is here
6220						 */
6221						int ret_spc;
6222
6223						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6224						    0, SCTP_SO_LOCKED);
6225
6226						freed_spc += ret_spc;
6227						if (freed_spc >= dataout) {
6228							return;
6229						}
6230					}	/* end if chk->data */
6231				}	/* end if right class */
6232			}	/* end if chk pr-sctp */
6233		}		/* tailqforeachsafe (chk) */
6234	}			/* if enabled in asoc */
6235}
6236
6237int
6238sctp_get_frag_point(struct sctp_tcb *stcb,
6239    struct sctp_association *asoc)
6240{
6241	int siz, ovh;
6242
6243	/*
6244	 * For endpoints that have both v6 and v4 addresses we must reserve
6245	 * room for the ipv6 header, for those that are only dealing with V4
6246	 * we use a larger frag point.
6247	 */
6248	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6249		ovh = SCTP_MIN_OVERHEAD;
6250	} else {
6251		ovh = SCTP_MIN_V4_OVERHEAD;
6252	}
6253	ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6254	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6255		siz = asoc->smallest_mtu - ovh;
6256	else
6257		siz = (stcb->asoc.sctp_frag_point - ovh);
6258	/*
6259	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6260	 */
6261	/* A data chunk MUST fit in a cluster */
6262	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6263	/* } */
6264
6265	/* adjust for an AUTH chunk if DATA requires auth */
6266	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6267		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6268
6269	if (siz % 4) {
6270		/* make it an even word boundary please */
6271		siz -= (siz % 4);
6272	}
6273	return (siz);
6274}
6275
6276static void
6277sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6278{
6279	/*
6280	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6281	 * positive lifetime but does not specify any PR_SCTP policy.
6282	 */
6283	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6284		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6285	} else if (sp->timetolive > 0) {
6286		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6287		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6288	} else {
6289		return;
6290	}
6291	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6292	case CHUNK_FLAGS_PR_SCTP_BUF:
6293		/*
6294		 * Time to live is a priority stored in tv_sec when doing
6295		 * the buffer drop thing.
6296		 */
6297		sp->ts.tv_sec = sp->timetolive;
6298		sp->ts.tv_usec = 0;
6299		break;
6300	case CHUNK_FLAGS_PR_SCTP_TTL:
6301		{
6302			struct timeval tv;
6303
6304			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6305			tv.tv_sec = sp->timetolive / 1000;
6306			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6307			/*
6308			 * TODO sctp_constants.h needs alternative time
6309			 * macros when _KERNEL is undefined.
6310			 */
6311			timevaladd(&sp->ts, &tv);
6312		}
6313		break;
6314	case CHUNK_FLAGS_PR_SCTP_RTX:
6315		/*
6316		 * Time to live is a the number or retransmissions stored in
6317		 * tv_sec.
6318		 */
6319		sp->ts.tv_sec = sp->timetolive;
6320		sp->ts.tv_usec = 0;
6321		break;
6322	default:
6323		SCTPDBG(SCTP_DEBUG_USRREQ1,
6324		    "Unknown PR_SCTP policy %u.\n",
6325		    PR_SCTP_POLICY(sp->sinfo_flags));
6326		break;
6327	}
6328}
6329
6330static int
6331sctp_msg_append(struct sctp_tcb *stcb,
6332    struct sctp_nets *net,
6333    struct mbuf *m,
6334    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6335{
6336	int error = 0;
6337	struct mbuf *at;
6338	struct sctp_stream_queue_pending *sp = NULL;
6339	struct sctp_stream_out *strm;
6340
6341	/*
6342	 * Given an mbuf chain, put it into the association send queue and
6343	 * place it on the wheel
6344	 */
6345	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6346		/* Invalid stream number */
6347		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6348		error = EINVAL;
6349		goto out_now;
6350	}
6351	if ((stcb->asoc.stream_locked) &&
6352	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6353		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6354		error = EINVAL;
6355		goto out_now;
6356	}
6357	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6358	/* Now can we send this? */
6359	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6360	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6361	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6362	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6363		/* got data while shutting down */
6364		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6365		error = ECONNRESET;
6366		goto out_now;
6367	}
6368	sctp_alloc_a_strmoq(stcb, sp);
6369	if (sp == NULL) {
6370		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6371		error = ENOMEM;
6372		goto out_now;
6373	}
6374	sp->sinfo_flags = srcv->sinfo_flags;
6375	sp->timetolive = srcv->sinfo_timetolive;
6376	sp->ppid = srcv->sinfo_ppid;
6377	sp->context = srcv->sinfo_context;
6378	sp->fsn = 0;
6379	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6380		sp->net = net;
6381		atomic_add_int(&sp->net->ref_count, 1);
6382	} else {
6383		sp->net = NULL;
6384	}
6385	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6386	sp->sid = srcv->sinfo_stream;
6387	sp->msg_is_complete = 1;
6388	sp->sender_all_done = 1;
6389	sp->some_taken = 0;
6390	sp->data = m;
6391	sp->tail_mbuf = NULL;
6392	sctp_set_prsctp_policy(sp);
6393	/*
6394	 * We could in theory (for sendall) sifa the length in, but we would
6395	 * still have to hunt through the chain since we need to setup the
6396	 * tail_mbuf
6397	 */
6398	sp->length = 0;
6399	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6400		if (SCTP_BUF_NEXT(at) == NULL)
6401			sp->tail_mbuf = at;
6402		sp->length += SCTP_BUF_LEN(at);
6403	}
6404	if (srcv->sinfo_keynumber_valid) {
6405		sp->auth_keyid = srcv->sinfo_keynumber;
6406	} else {
6407		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6408	}
6409	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6410		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6411		sp->holds_key_ref = 1;
6412	}
6413	if (hold_stcb_lock == 0) {
6414		SCTP_TCB_SEND_LOCK(stcb);
6415	}
6416	sctp_snd_sb_alloc(stcb, sp->length);
6417	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6418	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6419	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6420	m = NULL;
6421	if (hold_stcb_lock == 0) {
6422		SCTP_TCB_SEND_UNLOCK(stcb);
6423	}
6424out_now:
6425	if (m) {
6426		sctp_m_freem(m);
6427	}
6428	return (error);
6429}
6430
6431
6432static struct mbuf *
6433sctp_copy_mbufchain(struct mbuf *clonechain,
6434    struct mbuf *outchain,
6435    struct mbuf **endofchain,
6436    int can_take_mbuf,
6437    int sizeofcpy,
6438    uint8_t copy_by_ref)
6439{
6440	struct mbuf *m;
6441	struct mbuf *appendchain;
6442	caddr_t cp;
6443	int len;
6444
6445	if (endofchain == NULL) {
6446		/* error */
6447error_out:
6448		if (outchain)
6449			sctp_m_freem(outchain);
6450		return (NULL);
6451	}
6452	if (can_take_mbuf) {
6453		appendchain = clonechain;
6454	} else {
6455		if (!copy_by_ref &&
6456		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6457		    ) {
6458			/* Its not in a cluster */
6459			if (*endofchain == NULL) {
6460				/* lets get a mbuf cluster */
6461				if (outchain == NULL) {
6462					/* This is the general case */
6463			new_mbuf:
6464					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6465					if (outchain == NULL) {
6466						goto error_out;
6467					}
6468					SCTP_BUF_LEN(outchain) = 0;
6469					*endofchain = outchain;
6470					/* get the prepend space */
6471					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6472				} else {
6473					/*
6474					 * We really should not get a NULL
6475					 * in endofchain
6476					 */
6477					/* find end */
6478					m = outchain;
6479					while (m) {
6480						if (SCTP_BUF_NEXT(m) == NULL) {
6481							*endofchain = m;
6482							break;
6483						}
6484						m = SCTP_BUF_NEXT(m);
6485					}
6486					/* sanity */
6487					if (*endofchain == NULL) {
6488						/*
6489						 * huh, TSNH XXX maybe we
6490						 * should panic
6491						 */
6492						sctp_m_freem(outchain);
6493						goto new_mbuf;
6494					}
6495				}
6496				/* get the new end of length */
6497				len = (int)M_TRAILINGSPACE(*endofchain);
6498			} else {
6499				/* how much is left at the end? */
6500				len = (int)M_TRAILINGSPACE(*endofchain);
6501			}
6502			/* Find the end of the data, for appending */
6503			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6504
6505			/* Now lets copy it out */
6506			if (len >= sizeofcpy) {
6507				/* It all fits, copy it in */
6508				m_copydata(clonechain, 0, sizeofcpy, cp);
6509				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6510			} else {
6511				/* fill up the end of the chain */
6512				if (len > 0) {
6513					m_copydata(clonechain, 0, len, cp);
6514					SCTP_BUF_LEN((*endofchain)) += len;
6515					/* now we need another one */
6516					sizeofcpy -= len;
6517				}
6518				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6519				if (m == NULL) {
6520					/* We failed */
6521					goto error_out;
6522				}
6523				SCTP_BUF_NEXT((*endofchain)) = m;
6524				*endofchain = m;
6525				cp = mtod((*endofchain), caddr_t);
6526				m_copydata(clonechain, len, sizeofcpy, cp);
6527				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6528			}
6529			return (outchain);
6530		} else {
6531			/* copy the old fashion way */
6532			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6533#ifdef SCTP_MBUF_LOGGING
6534			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6535				sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6536			}
6537#endif
6538		}
6539	}
6540	if (appendchain == NULL) {
6541		/* error */
6542		if (outchain)
6543			sctp_m_freem(outchain);
6544		return (NULL);
6545	}
6546	if (outchain) {
6547		/* tack on to the end */
6548		if (*endofchain != NULL) {
6549			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6550		} else {
6551			m = outchain;
6552			while (m) {
6553				if (SCTP_BUF_NEXT(m) == NULL) {
6554					SCTP_BUF_NEXT(m) = appendchain;
6555					break;
6556				}
6557				m = SCTP_BUF_NEXT(m);
6558			}
6559		}
6560		/*
6561		 * save off the end and update the end-chain position
6562		 */
6563		m = appendchain;
6564		while (m) {
6565			if (SCTP_BUF_NEXT(m) == NULL) {
6566				*endofchain = m;
6567				break;
6568			}
6569			m = SCTP_BUF_NEXT(m);
6570		}
6571		return (outchain);
6572	} else {
6573		/* save off the end and update the end-chain position */
6574		m = appendchain;
6575		while (m) {
6576			if (SCTP_BUF_NEXT(m) == NULL) {
6577				*endofchain = m;
6578				break;
6579			}
6580			m = SCTP_BUF_NEXT(m);
6581		}
6582		return (appendchain);
6583	}
6584}
6585
6586static int
6587sctp_med_chunk_output(struct sctp_inpcb *inp,
6588    struct sctp_tcb *stcb,
6589    struct sctp_association *asoc,
6590    int *num_out,
6591    int *reason_code,
6592    int control_only, int from_where,
6593    struct timeval *now, int *now_filled, int frag_point, int so_locked
6594#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6595    SCTP_UNUSED
6596#endif
6597);
6598
6599static void
6600sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6601    uint32_t val SCTP_UNUSED)
6602{
6603	struct sctp_copy_all *ca;
6604	struct mbuf *m;
6605	int ret = 0;
6606	int added_control = 0;
6607	int un_sent, do_chunk_output = 1;
6608	struct sctp_association *asoc;
6609	struct sctp_nets *net;
6610
6611	ca = (struct sctp_copy_all *)ptr;
6612	if (ca->m == NULL) {
6613		return;
6614	}
6615	if (ca->inp != inp) {
6616		/* TSNH */
6617		return;
6618	}
6619	if (ca->sndlen > 0) {
6620		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6621		if (m == NULL) {
6622			/* can't copy so we are done */
6623			ca->cnt_failed++;
6624			return;
6625		}
6626#ifdef SCTP_MBUF_LOGGING
6627		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6628			sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6629		}
6630#endif
6631	} else {
6632		m = NULL;
6633	}
6634	SCTP_TCB_LOCK_ASSERT(stcb);
6635	if (stcb->asoc.alternate) {
6636		net = stcb->asoc.alternate;
6637	} else {
6638		net = stcb->asoc.primary_destination;
6639	}
6640	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6641		/* Abort this assoc with m as the user defined reason */
6642		if (m != NULL) {
6643			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6644		} else {
6645			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6646			    0, M_NOWAIT, 1, MT_DATA);
6647			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6648		}
6649		if (m != NULL) {
6650			struct sctp_paramhdr *ph;
6651
6652			ph = mtod(m, struct sctp_paramhdr *);
6653			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6654			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6655		}
6656		/*
6657		 * We add one here to keep the assoc from dis-appearing on
6658		 * us.
6659		 */
6660		atomic_add_int(&stcb->asoc.refcnt, 1);
6661		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6662		/*
6663		 * sctp_abort_an_association calls sctp_free_asoc() free
6664		 * association will NOT free it since we incremented the
6665		 * refcnt .. we do this to prevent it being freed and things
6666		 * getting tricky since we could end up (from free_asoc)
6667		 * calling inpcb_free which would get a recursive lock call
6668		 * to the iterator lock.. But as a consequence of that the
6669		 * stcb will return to us un-locked.. since free_asoc
6670		 * returns with either no TCB or the TCB unlocked, we must
6671		 * relock.. to unlock in the iterator timer :-0
6672		 */
6673		SCTP_TCB_LOCK(stcb);
6674		atomic_add_int(&stcb->asoc.refcnt, -1);
6675		goto no_chunk_output;
6676	} else {
6677		if (m) {
6678			ret = sctp_msg_append(stcb, net, m,
6679			    &ca->sndrcv, 1);
6680		}
6681		asoc = &stcb->asoc;
6682		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6683			/* shutdown this assoc */
6684			if (TAILQ_EMPTY(&asoc->send_queue) &&
6685			    TAILQ_EMPTY(&asoc->sent_queue) &&
6686			    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6687				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6688					goto abort_anyway;
6689				}
6690				/*
6691				 * there is nothing queued to send, so I'm
6692				 * done...
6693				 */
6694				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6695				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6696				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6697					/*
6698					 * only send SHUTDOWN the first time
6699					 * through
6700					 */
6701					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6702						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6703					}
6704					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6705					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6706					sctp_stop_timers_for_shutdown(stcb);
6707					sctp_send_shutdown(stcb, net);
6708					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6709					    net);
6710					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6711					    asoc->primary_destination);
6712					added_control = 1;
6713					do_chunk_output = 0;
6714				}
6715			} else {
6716				/*
6717				 * we still got (or just got) data to send,
6718				 * so set SHUTDOWN_PENDING
6719				 */
6720				/*
6721				 * XXX sockets draft says that SCTP_EOF
6722				 * should be sent with no data.  currently,
6723				 * we will allow user data to be sent first
6724				 * and move to SHUTDOWN-PENDING
6725				 */
6726				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6727				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6728				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6729					if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6730						asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6731					}
6732					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6733					if (TAILQ_EMPTY(&asoc->send_queue) &&
6734					    TAILQ_EMPTY(&asoc->sent_queue) &&
6735					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6736						struct mbuf *op_err;
6737						char msg[SCTP_DIAG_INFO_LEN];
6738
6739				abort_anyway:
6740						snprintf(msg, sizeof(msg),
6741						    "%s:%d at %s", __FILE__, __LINE__, __func__);
6742						op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6743						    msg);
6744						atomic_add_int(&stcb->asoc.refcnt, 1);
6745						sctp_abort_an_association(stcb->sctp_ep, stcb,
6746						    op_err, SCTP_SO_NOT_LOCKED);
6747						atomic_add_int(&stcb->asoc.refcnt, -1);
6748						goto no_chunk_output;
6749					}
6750					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6751					    asoc->primary_destination);
6752				}
6753			}
6754
6755		}
6756	}
6757	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6758	    (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6759
6760	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6761	    (stcb->asoc.total_flight > 0) &&
6762	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6763		do_chunk_output = 0;
6764	}
6765	if (do_chunk_output)
6766		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6767	else if (added_control) {
6768		int num_out, reason, now_filled = 0;
6769		struct timeval now;
6770		int frag_point;
6771
6772		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6773		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6774		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6775	}
6776no_chunk_output:
6777	if (ret) {
6778		ca->cnt_failed++;
6779	} else {
6780		ca->cnt_sent++;
6781	}
6782}
6783
6784static void
6785sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6786{
6787	struct sctp_copy_all *ca;
6788
6789	ca = (struct sctp_copy_all *)ptr;
6790	/*
6791	 * Do a notify here? Kacheong suggests that the notify be done at
6792	 * the send time.. so you would push up a notification if any send
6793	 * failed. Don't know if this is feasible since the only failures we
6794	 * have is "memory" related and if you cannot get an mbuf to send
6795	 * the data you surely can't get an mbuf to send up to notify the
6796	 * user you can't send the data :->
6797	 */
6798
6799	/* now free everything */
6800	sctp_m_freem(ca->m);
6801	SCTP_FREE(ca, SCTP_M_COPYAL);
6802}
6803
6804static struct mbuf *
6805sctp_copy_out_all(struct uio *uio, int len)
6806{
6807	struct mbuf *ret, *at;
6808	int left, willcpy, cancpy, error;
6809
6810	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6811	if (ret == NULL) {
6812		/* TSNH */
6813		return (NULL);
6814	}
6815	left = len;
6816	SCTP_BUF_LEN(ret) = 0;
6817	/* save space for the data chunk header */
6818	cancpy = (int)M_TRAILINGSPACE(ret);
6819	willcpy = min(cancpy, left);
6820	at = ret;
6821	while (left > 0) {
6822		/* Align data to the end */
6823		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6824		if (error) {
6825	err_out_now:
6826			sctp_m_freem(at);
6827			return (NULL);
6828		}
6829		SCTP_BUF_LEN(at) = willcpy;
6830		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6831		left -= willcpy;
6832		if (left > 0) {
6833			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6834			if (SCTP_BUF_NEXT(at) == NULL) {
6835				goto err_out_now;
6836			}
6837			at = SCTP_BUF_NEXT(at);
6838			SCTP_BUF_LEN(at) = 0;
6839			cancpy = (int)M_TRAILINGSPACE(at);
6840			willcpy = min(cancpy, left);
6841		}
6842	}
6843	return (ret);
6844}
6845
6846static int
6847sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6848    struct sctp_sndrcvinfo *srcv)
6849{
6850	int ret;
6851	struct sctp_copy_all *ca;
6852
6853	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6854	    SCTP_M_COPYAL);
6855	if (ca == NULL) {
6856		sctp_m_freem(m);
6857		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6858		return (ENOMEM);
6859	}
6860	memset(ca, 0, sizeof(struct sctp_copy_all));
6861
6862	ca->inp = inp;
6863	if (srcv) {
6864		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6865	}
6866	/*
6867	 * take off the sendall flag, it would be bad if we failed to do
6868	 * this :-0
6869	 */
6870	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6871	/* get length and mbuf chain */
6872	if (uio) {
6873		ca->sndlen = (int)uio->uio_resid;
6874		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6875		if (ca->m == NULL) {
6876			SCTP_FREE(ca, SCTP_M_COPYAL);
6877			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6878			return (ENOMEM);
6879		}
6880	} else {
6881		/* Gather the length of the send */
6882		struct mbuf *mat;
6883
6884		ca->sndlen = 0;
6885		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6886			ca->sndlen += SCTP_BUF_LEN(mat);
6887		}
6888	}
6889	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6890	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6891	    SCTP_ASOC_ANY_STATE,
6892	    (void *)ca, 0,
6893	    sctp_sendall_completes, inp, 1);
6894	if (ret) {
6895		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6896		SCTP_FREE(ca, SCTP_M_COPYAL);
6897		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6898		return (EFAULT);
6899	}
6900	return (0);
6901}
6902
6903
6904void
6905sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6906{
6907	struct sctp_tmit_chunk *chk, *nchk;
6908
6909	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6910		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6911			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6912			if (chk->data) {
6913				sctp_m_freem(chk->data);
6914				chk->data = NULL;
6915			}
6916			asoc->ctrl_queue_cnt--;
6917			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6918		}
6919	}
6920}
6921
6922void
6923sctp_toss_old_asconf(struct sctp_tcb *stcb)
6924{
6925	struct sctp_association *asoc;
6926	struct sctp_tmit_chunk *chk, *nchk;
6927	struct sctp_asconf_chunk *acp;
6928
6929	asoc = &stcb->asoc;
6930	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6931		/* find SCTP_ASCONF chunk in queue */
6932		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6933			if (chk->data) {
6934				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6935				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6936					/* Not Acked yet */
6937					break;
6938				}
6939			}
6940			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6941			if (chk->data) {
6942				sctp_m_freem(chk->data);
6943				chk->data = NULL;
6944			}
6945			asoc->ctrl_queue_cnt--;
6946			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6947		}
6948	}
6949}
6950
6951
6952static void
6953sctp_clean_up_datalist(struct sctp_tcb *stcb,
6954    struct sctp_association *asoc,
6955    struct sctp_tmit_chunk **data_list,
6956    int bundle_at,
6957    struct sctp_nets *net)
6958{
6959	int i;
6960	struct sctp_tmit_chunk *tp1;
6961
6962	for (i = 0; i < bundle_at; i++) {
6963		/* off of the send queue */
6964		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6965		asoc->send_queue_cnt--;
6966		if (i > 0) {
6967			/*
6968			 * Any chunk NOT 0 you zap the time chunk 0 gets
6969			 * zapped or set based on if a RTO measurment is
6970			 * needed.
6971			 */
6972			data_list[i]->do_rtt = 0;
6973		}
6974		/* record time */
6975		data_list[i]->sent_rcv_time = net->last_sent_time;
6976		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6977		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6978		if (data_list[i]->whoTo == NULL) {
6979			data_list[i]->whoTo = net;
6980			atomic_add_int(&net->ref_count, 1);
6981		}
6982		/* on to the sent queue */
6983		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6984		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6985			struct sctp_tmit_chunk *tpp;
6986
6987			/* need to move back */
6988	back_up_more:
6989			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6990			if (tpp == NULL) {
6991				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6992				goto all_done;
6993			}
6994			tp1 = tpp;
6995			if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6996				goto back_up_more;
6997			}
6998			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6999		} else {
7000			TAILQ_INSERT_TAIL(&asoc->sent_queue,
7001			    data_list[i],
7002			    sctp_next);
7003		}
7004all_done:
7005		/* This does not lower until the cum-ack passes it */
7006		asoc->sent_queue_cnt++;
7007		if ((asoc->peers_rwnd <= 0) &&
7008		    (asoc->total_flight == 0) &&
7009		    (bundle_at == 1)) {
7010			/* Mark the chunk as being a window probe */
7011			SCTP_STAT_INCR(sctps_windowprobed);
7012		}
7013#ifdef SCTP_AUDITING_ENABLED
7014		sctp_audit_log(0xC2, 3);
7015#endif
7016		data_list[i]->sent = SCTP_DATAGRAM_SENT;
7017		data_list[i]->snd_count = 1;
7018		data_list[i]->rec.data.chunk_was_revoked = 0;
7019		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7020			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7021			    data_list[i]->whoTo->flight_size,
7022			    data_list[i]->book_size,
7023			    (uint32_t)(uintptr_t)data_list[i]->whoTo,
7024			    data_list[i]->rec.data.tsn);
7025		}
7026		sctp_flight_size_increase(data_list[i]);
7027		sctp_total_flight_increase(stcb, data_list[i]);
7028		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7029			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7030			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7031		}
7032		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7033		    (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7034		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7035			/* SWS sender side engages */
7036			asoc->peers_rwnd = 0;
7037		}
7038	}
7039	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7040		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7041	}
7042}
7043
7044static void
7045sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7046#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7047    SCTP_UNUSED
7048#endif
7049)
7050{
7051	struct sctp_tmit_chunk *chk, *nchk;
7052
7053	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7054		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7055		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7056		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7057		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7058		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7059		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7060		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7061		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7062		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7063		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7064		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7065		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7066			/* Stray chunks must be cleaned up */
7067	clean_up_anyway:
7068			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7069			if (chk->data) {
7070				sctp_m_freem(chk->data);
7071				chk->data = NULL;
7072			}
7073			asoc->ctrl_queue_cnt--;
7074			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7075				asoc->fwd_tsn_cnt--;
7076			sctp_free_a_chunk(stcb, chk, so_locked);
7077		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7078			/* special handling, we must look into the param */
7079			if (chk != asoc->str_reset) {
7080				goto clean_up_anyway;
7081			}
7082		}
7083	}
7084}
7085
7086static uint32_t
7087sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7088    uint32_t space_left, uint32_t frag_point, int eeor_on)
7089{
7090	/*
7091	 * Make a decision on if I should split a msg into multiple parts.
7092	 * This is only asked of incomplete messages.
7093	 */
7094	if (eeor_on) {
7095		/*
7096		 * If we are doing EEOR we need to always send it if its the
7097		 * entire thing, since it might be all the guy is putting in
7098		 * the hopper.
7099		 */
7100		if (space_left >= length) {
7101			/*-
7102			 * If we have data outstanding,
7103			 * we get another chance when the sack
7104			 * arrives to transmit - wait for more data
7105			 */
7106			if (stcb->asoc.total_flight == 0) {
7107				/*
7108				 * If nothing is in flight, we zero the
7109				 * packet counter.
7110				 */
7111				return (length);
7112			}
7113			return (0);
7114
7115		} else {
7116			/* You can fill the rest */
7117			return (space_left);
7118		}
7119	}
7120	/*-
7121	 * For those strange folk that make the send buffer
7122	 * smaller than our fragmentation point, we can't
7123	 * get a full msg in so we have to allow splitting.
7124	 */
7125	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7126		return (length);
7127	}
7128	if ((length <= space_left) ||
7129	    ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7130		/* Sub-optimial residual don't split in non-eeor mode. */
7131		return (0);
7132	}
7133	/*
7134	 * If we reach here length is larger than the space_left. Do we wish
7135	 * to split it for the sake of packet putting together?
7136	 */
7137	if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7138		/* Its ok to split it */
7139		return (min(space_left, frag_point));
7140	}
7141	/* Nope, can't split */
7142	return (0);
7143}
7144
7145static uint32_t
7146sctp_move_to_outqueue(struct sctp_tcb *stcb,
7147    struct sctp_stream_out *strq,
7148    uint32_t space_left,
7149    uint32_t frag_point,
7150    int *giveup,
7151    int eeor_mode,
7152    int *bail,
7153    int so_locked
7154#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7155    SCTP_UNUSED
7156#endif
7157)
7158{
7159	/* Move from the stream to the send_queue keeping track of the total */
7160	struct sctp_association *asoc;
7161	struct sctp_stream_queue_pending *sp;
7162	struct sctp_tmit_chunk *chk;
7163	struct sctp_data_chunk *dchkh = NULL;
7164	struct sctp_idata_chunk *ndchkh = NULL;
7165	uint32_t to_move, length;
7166	int leading;
7167	uint8_t rcv_flags = 0;
7168	uint8_t some_taken;
7169	uint8_t send_lock_up = 0;
7170
7171	SCTP_TCB_LOCK_ASSERT(stcb);
7172	asoc = &stcb->asoc;
7173one_more_time:
7174	/* sa_ignore FREED_MEMORY */
7175	sp = TAILQ_FIRST(&strq->outqueue);
7176	if (sp == NULL) {
7177		if (send_lock_up == 0) {
7178			SCTP_TCB_SEND_LOCK(stcb);
7179			send_lock_up = 1;
7180		}
7181		sp = TAILQ_FIRST(&strq->outqueue);
7182		if (sp) {
7183			goto one_more_time;
7184		}
7185		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7186		    (stcb->asoc.idata_supported == 0) &&
7187		    (strq->last_msg_incomplete)) {
7188			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7189			    strq->sid,
7190			    strq->last_msg_incomplete);
7191			strq->last_msg_incomplete = 0;
7192		}
7193		to_move = 0;
7194		if (send_lock_up) {
7195			SCTP_TCB_SEND_UNLOCK(stcb);
7196			send_lock_up = 0;
7197		}
7198		goto out_of;
7199	}
7200	if ((sp->msg_is_complete) && (sp->length == 0)) {
7201		if (sp->sender_all_done) {
7202			/*
7203			 * We are doing differed cleanup. Last time through
7204			 * when we took all the data the sender_all_done was
7205			 * not set.
7206			 */
7207			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7208				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7209				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7210				    sp->sender_all_done,
7211				    sp->length,
7212				    sp->msg_is_complete,
7213				    sp->put_last_out,
7214				    send_lock_up);
7215			}
7216			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7217				SCTP_TCB_SEND_LOCK(stcb);
7218				send_lock_up = 1;
7219			}
7220			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7221			TAILQ_REMOVE(&strq->outqueue, sp, next);
7222			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7223			if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7224			    (strq->chunks_on_queues == 0) &&
7225			    TAILQ_EMPTY(&strq->outqueue)) {
7226				stcb->asoc.trigger_reset = 1;
7227			}
7228			if (sp->net) {
7229				sctp_free_remote_addr(sp->net);
7230				sp->net = NULL;
7231			}
7232			if (sp->data) {
7233				sctp_m_freem(sp->data);
7234				sp->data = NULL;
7235			}
7236			sctp_free_a_strmoq(stcb, sp, so_locked);
7237			/* we can't be locked to it */
7238			if (send_lock_up) {
7239				SCTP_TCB_SEND_UNLOCK(stcb);
7240				send_lock_up = 0;
7241			}
7242			/* back to get the next msg */
7243			goto one_more_time;
7244		} else {
7245			/*
7246			 * sender just finished this but still holds a
7247			 * reference
7248			 */
7249			*giveup = 1;
7250			to_move = 0;
7251			goto out_of;
7252		}
7253	} else {
7254		/* is there some to get */
7255		if (sp->length == 0) {
7256			/* no */
7257			*giveup = 1;
7258			to_move = 0;
7259			goto out_of;
7260		} else if (sp->discard_rest) {
7261			if (send_lock_up == 0) {
7262				SCTP_TCB_SEND_LOCK(stcb);
7263				send_lock_up = 1;
7264			}
7265			/* Whack down the size */
7266			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7267			if ((stcb->sctp_socket != NULL) &&
7268			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7269			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7270				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7271			}
7272			if (sp->data) {
7273				sctp_m_freem(sp->data);
7274				sp->data = NULL;
7275				sp->tail_mbuf = NULL;
7276			}
7277			sp->length = 0;
7278			sp->some_taken = 1;
7279			*giveup = 1;
7280			to_move = 0;
7281			goto out_of;
7282		}
7283	}
7284	some_taken = sp->some_taken;
7285re_look:
7286	length = sp->length;
7287	if (sp->msg_is_complete) {
7288		/* The message is complete */
7289		to_move = min(length, frag_point);
7290		if (to_move == length) {
7291			/* All of it fits in the MTU */
7292			if (sp->some_taken) {
7293				rcv_flags |= SCTP_DATA_LAST_FRAG;
7294			} else {
7295				rcv_flags |= SCTP_DATA_NOT_FRAG;
7296			}
7297			sp->put_last_out = 1;
7298			if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7299				rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7300			}
7301		} else {
7302			/* Not all of it fits, we fragment */
7303			if (sp->some_taken == 0) {
7304				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7305			}
7306			sp->some_taken = 1;
7307		}
7308	} else {
7309		to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7310		if (to_move) {
7311			/*-
7312			 * We use a snapshot of length in case it
7313			 * is expanding during the compare.
7314			 */
7315			uint32_t llen;
7316
7317			llen = length;
7318			if (to_move >= llen) {
7319				to_move = llen;
7320				if (send_lock_up == 0) {
7321					/*-
7322					 * We are taking all of an incomplete msg
7323					 * thus we need a send lock.
7324					 */
7325					SCTP_TCB_SEND_LOCK(stcb);
7326					send_lock_up = 1;
7327					if (sp->msg_is_complete) {
7328						/*
7329						 * the sender finished the
7330						 * msg
7331						 */
7332						goto re_look;
7333					}
7334				}
7335			}
7336			if (sp->some_taken == 0) {
7337				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7338				sp->some_taken = 1;
7339			}
7340		} else {
7341			/* Nothing to take. */
7342			*giveup = 1;
7343			to_move = 0;
7344			goto out_of;
7345		}
7346	}
7347
7348	/* If we reach here, we can copy out a chunk */
7349	sctp_alloc_a_chunk(stcb, chk);
7350	if (chk == NULL) {
7351		/* No chunk memory */
7352		*giveup = 1;
7353		to_move = 0;
7354		goto out_of;
7355	}
7356	/*
7357	 * Setup for unordered if needed by looking at the user sent info
7358	 * flags.
7359	 */
7360	if (sp->sinfo_flags & SCTP_UNORDERED) {
7361		rcv_flags |= SCTP_DATA_UNORDERED;
7362	}
7363	if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7364	    (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7365		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7366	}
7367	/* clear out the chunk before setting up */
7368	memset(chk, 0, sizeof(*chk));
7369	chk->rec.data.rcv_flags = rcv_flags;
7370
7371	if (to_move >= length) {
7372		/* we think we can steal the whole thing */
7373		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7374			SCTP_TCB_SEND_LOCK(stcb);
7375			send_lock_up = 1;
7376		}
7377		if (to_move < sp->length) {
7378			/* bail, it changed */
7379			goto dont_do_it;
7380		}
7381		chk->data = sp->data;
7382		chk->last_mbuf = sp->tail_mbuf;
7383		/* register the stealing */
7384		sp->data = sp->tail_mbuf = NULL;
7385	} else {
7386		struct mbuf *m;
7387
7388dont_do_it:
7389		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7390		chk->last_mbuf = NULL;
7391		if (chk->data == NULL) {
7392			sp->some_taken = some_taken;
7393			sctp_free_a_chunk(stcb, chk, so_locked);
7394			*bail = 1;
7395			to_move = 0;
7396			goto out_of;
7397		}
7398#ifdef SCTP_MBUF_LOGGING
7399		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7400			sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7401		}
7402#endif
7403		/* Pull off the data */
7404		m_adj(sp->data, to_move);
7405		/* Now lets work our way down and compact it */
7406		m = sp->data;
7407		while (m && (SCTP_BUF_LEN(m) == 0)) {
7408			sp->data = SCTP_BUF_NEXT(m);
7409			SCTP_BUF_NEXT(m) = NULL;
7410			if (sp->tail_mbuf == m) {
7411				/*-
7412				 * Freeing tail? TSNH since
7413				 * we supposedly were taking less
7414				 * than the sp->length.
7415				 */
7416#ifdef INVARIANTS
7417				panic("Huh, freing tail? - TSNH");
7418#else
7419				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7420				sp->tail_mbuf = sp->data = NULL;
7421				sp->length = 0;
7422#endif
7423
7424			}
7425			sctp_m_free(m);
7426			m = sp->data;
7427		}
7428	}
7429	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7430		chk->copy_by_ref = 1;
7431	} else {
7432		chk->copy_by_ref = 0;
7433	}
7434	/*
7435	 * get last_mbuf and counts of mb usage This is ugly but hopefully
7436	 * its only one mbuf.
7437	 */
7438	if (chk->last_mbuf == NULL) {
7439		chk->last_mbuf = chk->data;
7440		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7441			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7442		}
7443	}
7444	if (to_move > length) {
7445		/*- This should not happen either
7446		 * since we always lower to_move to the size
7447		 * of sp->length if its larger.
7448		 */
7449#ifdef INVARIANTS
7450		panic("Huh, how can to_move be larger?");
7451#else
7452		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7453		sp->length = 0;
7454#endif
7455	} else {
7456		atomic_subtract_int(&sp->length, to_move);
7457	}
7458	leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7459	if (M_LEADINGSPACE(chk->data) < leading) {
7460		/* Not enough room for a chunk header, get some */
7461		struct mbuf *m;
7462
7463		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7464		if (m == NULL) {
7465			/*
7466			 * we're in trouble here. _PREPEND below will free
7467			 * all the data if there is no leading space, so we
7468			 * must put the data back and restore.
7469			 */
7470			if (send_lock_up == 0) {
7471				SCTP_TCB_SEND_LOCK(stcb);
7472				send_lock_up = 1;
7473			}
7474			if (sp->data == NULL) {
7475				/* unsteal the data */
7476				sp->data = chk->data;
7477				sp->tail_mbuf = chk->last_mbuf;
7478			} else {
7479				struct mbuf *m_tmp;
7480
7481				/* reassemble the data */
7482				m_tmp = sp->data;
7483				sp->data = chk->data;
7484				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7485			}
7486			sp->some_taken = some_taken;
7487			atomic_add_int(&sp->length, to_move);
7488			chk->data = NULL;
7489			*bail = 1;
7490			sctp_free_a_chunk(stcb, chk, so_locked);
7491			to_move = 0;
7492			goto out_of;
7493		} else {
7494			SCTP_BUF_LEN(m) = 0;
7495			SCTP_BUF_NEXT(m) = chk->data;
7496			chk->data = m;
7497			M_ALIGN(chk->data, 4);
7498		}
7499	}
7500	SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7501	if (chk->data == NULL) {
7502		/* HELP, TSNH since we assured it would not above? */
7503#ifdef INVARIANTS
7504		panic("prepend failes HELP?");
7505#else
7506		SCTP_PRINTF("prepend fails HELP?\n");
7507		sctp_free_a_chunk(stcb, chk, so_locked);
7508#endif
7509		*bail = 1;
7510		to_move = 0;
7511		goto out_of;
7512	}
7513	sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7514	chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7515	chk->book_size_scale = 0;
7516	chk->sent = SCTP_DATAGRAM_UNSENT;
7517
7518	chk->flags = 0;
7519	chk->asoc = &stcb->asoc;
7520	chk->pad_inplace = 0;
7521	chk->no_fr_allowed = 0;
7522	if (stcb->asoc.idata_supported == 0) {
7523		if (rcv_flags & SCTP_DATA_UNORDERED) {
7524			/* Just use 0. The receiver ignores the values. */
7525			chk->rec.data.mid = 0;
7526		} else {
7527			chk->rec.data.mid = strq->next_mid_ordered;
7528			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7529				strq->next_mid_ordered++;
7530			}
7531		}
7532	} else {
7533		if (rcv_flags & SCTP_DATA_UNORDERED) {
7534			chk->rec.data.mid = strq->next_mid_unordered;
7535			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7536				strq->next_mid_unordered++;
7537			}
7538		} else {
7539			chk->rec.data.mid = strq->next_mid_ordered;
7540			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7541				strq->next_mid_ordered++;
7542			}
7543		}
7544	}
7545	chk->rec.data.sid = sp->sid;
7546	chk->rec.data.ppid = sp->ppid;
7547	chk->rec.data.context = sp->context;
7548	chk->rec.data.doing_fast_retransmit = 0;
7549
7550	chk->rec.data.timetodrop = sp->ts;
7551	chk->flags = sp->act_flags;
7552
7553	if (sp->net) {
7554		chk->whoTo = sp->net;
7555		atomic_add_int(&chk->whoTo->ref_count, 1);
7556	} else
7557		chk->whoTo = NULL;
7558
7559	if (sp->holds_key_ref) {
7560		chk->auth_keyid = sp->auth_keyid;
7561		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7562		chk->holds_key_ref = 1;
7563	}
7564	chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7565	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7566		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7567		    (uint32_t)(uintptr_t)stcb, sp->length,
7568		    (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7569		    chk->rec.data.tsn);
7570	}
7571	if (stcb->asoc.idata_supported == 0) {
7572		dchkh = mtod(chk->data, struct sctp_data_chunk *);
7573	} else {
7574		ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7575	}
7576	/*
7577	 * Put the rest of the things in place now. Size was done earlier in
7578	 * previous loop prior to padding.
7579	 */
7580
7581#ifdef SCTP_ASOCLOG_OF_TSNS
7582	SCTP_TCB_LOCK_ASSERT(stcb);
7583	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7584		asoc->tsn_out_at = 0;
7585		asoc->tsn_out_wrapped = 1;
7586	}
7587	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7588	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7589	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7590	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7591	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7592	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7593	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7594	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7595	asoc->tsn_out_at++;
7596#endif
7597	if (stcb->asoc.idata_supported == 0) {
7598		dchkh->ch.chunk_type = SCTP_DATA;
7599		dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7600		dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7601		dchkh->dp.sid = htons(strq->sid);
7602		dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7603		dchkh->dp.ppid = chk->rec.data.ppid;
7604		dchkh->ch.chunk_length = htons(chk->send_size);
7605	} else {
7606		ndchkh->ch.chunk_type = SCTP_IDATA;
7607		ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7608		ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7609		ndchkh->dp.sid = htons(strq->sid);
7610		ndchkh->dp.reserved = htons(0);
7611		ndchkh->dp.mid = htonl(chk->rec.data.mid);
7612		if (sp->fsn == 0)
7613			ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7614		else
7615			ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7616		sp->fsn++;
7617		ndchkh->ch.chunk_length = htons(chk->send_size);
7618	}
7619	/* Now advance the chk->send_size by the actual pad needed. */
7620	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7621		/* need a pad */
7622		struct mbuf *lm;
7623		int pads;
7624
7625		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7626		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7627		if (lm != NULL) {
7628			chk->last_mbuf = lm;
7629			chk->pad_inplace = 1;
7630		}
7631		chk->send_size += pads;
7632	}
7633	if (PR_SCTP_ENABLED(chk->flags)) {
7634		asoc->pr_sctp_cnt++;
7635	}
7636	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7637		/* All done pull and kill the message */
7638		if (sp->put_last_out == 0) {
7639			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7640			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7641			    sp->sender_all_done,
7642			    sp->length,
7643			    sp->msg_is_complete,
7644			    sp->put_last_out,
7645			    send_lock_up);
7646		}
7647		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7648			SCTP_TCB_SEND_LOCK(stcb);
7649			send_lock_up = 1;
7650		}
7651		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7652		TAILQ_REMOVE(&strq->outqueue, sp, next);
7653		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7654		if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7655		    (strq->chunks_on_queues == 0) &&
7656		    TAILQ_EMPTY(&strq->outqueue)) {
7657			stcb->asoc.trigger_reset = 1;
7658		}
7659		if (sp->net) {
7660			sctp_free_remote_addr(sp->net);
7661			sp->net = NULL;
7662		}
7663		if (sp->data) {
7664			sctp_m_freem(sp->data);
7665			sp->data = NULL;
7666		}
7667		sctp_free_a_strmoq(stcb, sp, so_locked);
7668	}
7669	asoc->chunks_on_out_queue++;
7670	strq->chunks_on_queues++;
7671	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7672	asoc->send_queue_cnt++;
7673out_of:
7674	if (send_lock_up) {
7675		SCTP_TCB_SEND_UNLOCK(stcb);
7676	}
7677	return (to_move);
7678}
7679
7680
7681static void
7682sctp_fill_outqueue(struct sctp_tcb *stcb,
7683    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7684#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7685    SCTP_UNUSED
7686#endif
7687)
7688{
7689	struct sctp_association *asoc;
7690	struct sctp_stream_out *strq;
7691	uint32_t space_left, moved, total_moved;
7692	int bail, giveup;
7693
7694	SCTP_TCB_LOCK_ASSERT(stcb);
7695	asoc = &stcb->asoc;
7696	total_moved = 0;
7697	switch (net->ro._l_addr.sa.sa_family) {
7698#ifdef INET
7699	case AF_INET:
7700		space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7701		break;
7702#endif
7703#ifdef INET6
7704	case AF_INET6:
7705		space_left = net->mtu - SCTP_MIN_OVERHEAD;
7706		break;
7707#endif
7708	default:
7709		/* TSNH */
7710		space_left = net->mtu;
7711		break;
7712	}
7713	/* Need an allowance for the data chunk header too */
7714	space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7715
7716	/* must make even word boundary */
7717	space_left &= 0xfffffffc;
7718	strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7719	giveup = 0;
7720	bail = 0;
7721	while ((space_left > 0) && (strq != NULL)) {
7722		moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7723		    &giveup, eeor_mode, &bail, so_locked);
7724		stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7725		if ((giveup != 0) || (bail != 0)) {
7726			break;
7727		}
7728		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7729		total_moved += moved;
7730		space_left -= moved;
7731		if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7732			space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7733		} else {
7734			space_left = 0;
7735		}
7736		space_left &= 0xfffffffc;
7737	}
7738	if (bail != 0)
7739		*quit_now = 1;
7740
7741	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7742
7743	if (total_moved == 0) {
7744		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7745		    (net == stcb->asoc.primary_destination)) {
7746			/* ran dry for primary network net */
7747			SCTP_STAT_INCR(sctps_primary_randry);
7748		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7749			/* ran dry with CMT on */
7750			SCTP_STAT_INCR(sctps_cmt_randry);
7751		}
7752	}
7753}
7754
7755void
7756sctp_fix_ecn_echo(struct sctp_association *asoc)
7757{
7758	struct sctp_tmit_chunk *chk;
7759
7760	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7761		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7762			chk->sent = SCTP_DATAGRAM_UNSENT;
7763		}
7764	}
7765}
7766
7767void
7768sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7769{
7770	struct sctp_association *asoc;
7771	struct sctp_tmit_chunk *chk;
7772	struct sctp_stream_queue_pending *sp;
7773	unsigned int i;
7774
7775	if (net == NULL) {
7776		return;
7777	}
7778	asoc = &stcb->asoc;
7779	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7780		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7781			if (sp->net == net) {
7782				sctp_free_remote_addr(sp->net);
7783				sp->net = NULL;
7784			}
7785		}
7786	}
7787	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7788		if (chk->whoTo == net) {
7789			sctp_free_remote_addr(chk->whoTo);
7790			chk->whoTo = NULL;
7791		}
7792	}
7793}
7794
7795int
7796sctp_med_chunk_output(struct sctp_inpcb *inp,
7797    struct sctp_tcb *stcb,
7798    struct sctp_association *asoc,
7799    int *num_out,
7800    int *reason_code,
7801    int control_only, int from_where,
7802    struct timeval *now, int *now_filled, int frag_point, int so_locked
7803#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7804    SCTP_UNUSED
7805#endif
7806)
7807{
7808	/**
7809	 * Ok this is the generic chunk service queue. we must do the
7810	 * following:
7811	 * - Service the stream queue that is next, moving any
7812	 *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7813	 *   LAST to the out queue in one pass) and assigning TSN's. This
7814	 *   only applys though if the peer does not support NDATA. For NDATA
7815	 *   chunks its ok to not send the entire message ;-)
7816	 * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7817	 *   fomulate and send the low level chunks. Making sure to combine
7818	 *   any control in the control chunk queue also.
7819	 */
7820	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7821	struct mbuf *outchain, *endoutchain;
7822	struct sctp_tmit_chunk *chk, *nchk;
7823
7824	/* temp arrays for unlinking */
7825	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7826	int no_fragmentflg, error;
7827	unsigned int max_rwnd_per_dest, max_send_per_dest;
7828	int one_chunk, hbflag, skip_data_for_this_net;
7829	int asconf, cookie, no_out_cnt;
7830	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7831	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7832	int tsns_sent = 0;
7833	uint32_t auth_offset = 0;
7834	struct sctp_auth_chunk *auth = NULL;
7835	uint16_t auth_keyid;
7836	int override_ok = 1;
7837	int skip_fill_up = 0;
7838	int data_auth_reqd = 0;
7839
7840	/*
7841	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7842	 * destination.
7843	 */
7844	int quit_now = 0;
7845
7846	*num_out = 0;
7847	*reason_code = 0;
7848	auth_keyid = stcb->asoc.authinfo.active_keyid;
7849	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7850	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7851	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7852		eeor_mode = 1;
7853	} else {
7854		eeor_mode = 0;
7855	}
7856	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7857	/*
7858	 * First lets prime the pump. For each destination, if there is room
7859	 * in the flight size, attempt to pull an MTU's worth out of the
7860	 * stream queues into the general send_queue
7861	 */
7862#ifdef SCTP_AUDITING_ENABLED
7863	sctp_audit_log(0xC2, 2);
7864#endif
7865	SCTP_TCB_LOCK_ASSERT(stcb);
7866	hbflag = 0;
7867	if (control_only)
7868		no_data_chunks = 1;
7869	else
7870		no_data_chunks = 0;
7871
7872	/* Nothing to possible to send? */
7873	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7874	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7875	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7876	    TAILQ_EMPTY(&asoc->send_queue) &&
7877	    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7878nothing_to_send:
7879		*reason_code = 9;
7880		return (0);
7881	}
7882	if (asoc->peers_rwnd == 0) {
7883		/* No room in peers rwnd */
7884		*reason_code = 1;
7885		if (asoc->total_flight > 0) {
7886			/* we are allowed one chunk in flight */
7887			no_data_chunks = 1;
7888		}
7889	}
7890	if (stcb->asoc.ecn_echo_cnt_onq) {
7891		/* Record where a sack goes, if any */
7892		if (no_data_chunks &&
7893		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7894			/* Nothing but ECNe to send - we don't do that */
7895			goto nothing_to_send;
7896		}
7897		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7898			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7899			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7900				sack_goes_to = chk->whoTo;
7901				break;
7902			}
7903		}
7904	}
7905	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7906	if (stcb->sctp_socket)
7907		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7908	else
7909		max_send_per_dest = 0;
7910	if (no_data_chunks == 0) {
7911		/* How many non-directed chunks are there? */
7912		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7913			if (chk->whoTo == NULL) {
7914				/*
7915				 * We already have non-directed chunks on
7916				 * the queue, no need to do a fill-up.
7917				 */
7918				skip_fill_up = 1;
7919				break;
7920			}
7921		}
7922
7923	}
7924	if ((no_data_chunks == 0) &&
7925	    (skip_fill_up == 0) &&
7926	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7927		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7928			/*
7929			 * This for loop we are in takes in each net, if
7930			 * its's got space in cwnd and has data sent to it
7931			 * (when CMT is off) then it calls
7932			 * sctp_fill_outqueue for the net. This gets data on
7933			 * the send queue for that network.
7934			 *
7935			 * In sctp_fill_outqueue TSN's are assigned and data
7936			 * is copied out of the stream buffers. Note mostly
7937			 * copy by reference (we hope).
7938			 */
7939			net->window_probe = 0;
7940			if ((net != stcb->asoc.alternate) &&
7941			    ((net->dest_state & SCTP_ADDR_PF) ||
7942			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7943			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7944				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7945					sctp_log_cwnd(stcb, net, 1,
7946					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7947				}
7948				continue;
7949			}
7950			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7951			    (net->flight_size == 0)) {
7952				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7953			}
7954			if (net->flight_size >= net->cwnd) {
7955				/* skip this network, no room - can't fill */
7956				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7957					sctp_log_cwnd(stcb, net, 3,
7958					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7959				}
7960				continue;
7961			}
7962			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7963				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7964			}
7965			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7966			if (quit_now) {
7967				/* memory alloc failure */
7968				no_data_chunks = 1;
7969				break;
7970			}
7971		}
7972	}
7973	/* now service each destination and send out what we can for it */
7974	/* Nothing to send? */
7975	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7976	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7977	    TAILQ_EMPTY(&asoc->send_queue)) {
7978		*reason_code = 8;
7979		return (0);
7980	}
7981	if (asoc->sctp_cmt_on_off > 0) {
7982		/* get the last start point */
7983		start_at = asoc->last_net_cmt_send_started;
7984		if (start_at == NULL) {
7985			/* null so to beginning */
7986			start_at = TAILQ_FIRST(&asoc->nets);
7987		} else {
7988			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7989			if (start_at == NULL) {
7990				start_at = TAILQ_FIRST(&asoc->nets);
7991			}
7992		}
7993		asoc->last_net_cmt_send_started = start_at;
7994	} else {
7995		start_at = TAILQ_FIRST(&asoc->nets);
7996	}
7997	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7998		if (chk->whoTo == NULL) {
7999			if (asoc->alternate) {
8000				chk->whoTo = asoc->alternate;
8001			} else {
8002				chk->whoTo = asoc->primary_destination;
8003			}
8004			atomic_add_int(&chk->whoTo->ref_count, 1);
8005		}
8006	}
8007	old_start_at = NULL;
8008again_one_more_time:
8009	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8010		/* how much can we send? */
8011		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8012		if (old_start_at && (old_start_at == net)) {
8013			/* through list ocmpletely. */
8014			break;
8015		}
8016		tsns_sent = 0xa;
8017		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8018		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8019		    (net->flight_size >= net->cwnd)) {
8020			/*
8021			 * Nothing on control or asconf and flight is full,
8022			 * we can skip even in the CMT case.
8023			 */
8024			continue;
8025		}
8026		bundle_at = 0;
8027		endoutchain = outchain = NULL;
8028		no_fragmentflg = 1;
8029		one_chunk = 0;
8030		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8031			skip_data_for_this_net = 1;
8032		} else {
8033			skip_data_for_this_net = 0;
8034		}
8035		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8036#ifdef INET
8037		case AF_INET:
8038			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8039			break;
8040#endif
8041#ifdef INET6
8042		case AF_INET6:
8043			mtu = net->mtu - SCTP_MIN_OVERHEAD;
8044			break;
8045#endif
8046		default:
8047			/* TSNH */
8048			mtu = net->mtu;
8049			break;
8050		}
8051		mx_mtu = mtu;
8052		to_out = 0;
8053		if (mtu > asoc->peers_rwnd) {
8054			if (asoc->total_flight > 0) {
8055				/* We have a packet in flight somewhere */
8056				r_mtu = asoc->peers_rwnd;
8057			} else {
8058				/* We are always allowed to send one MTU out */
8059				one_chunk = 1;
8060				r_mtu = mtu;
8061			}
8062		} else {
8063			r_mtu = mtu;
8064		}
8065		error = 0;
8066		/************************/
8067		/* ASCONF transmission */
8068		/************************/
8069		/* Now first lets go through the asconf queue */
8070		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8071			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8072				continue;
8073			}
8074			if (chk->whoTo == NULL) {
8075				if (asoc->alternate == NULL) {
8076					if (asoc->primary_destination != net) {
8077						break;
8078					}
8079				} else {
8080					if (asoc->alternate != net) {
8081						break;
8082					}
8083				}
8084			} else {
8085				if (chk->whoTo != net) {
8086					break;
8087				}
8088			}
8089			if (chk->data == NULL) {
8090				break;
8091			}
8092			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8093			    chk->sent != SCTP_DATAGRAM_RESEND) {
8094				break;
8095			}
8096			/*
8097			 * if no AUTH is yet included and this chunk
8098			 * requires it, make sure to account for it.  We
8099			 * don't apply the size until the AUTH chunk is
8100			 * actually added below in case there is no room for
8101			 * this chunk. NOTE: we overload the use of "omtu"
8102			 * here
8103			 */
8104			if ((auth == NULL) &&
8105			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8106			    stcb->asoc.peer_auth_chunks)) {
8107				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8108			} else
8109				omtu = 0;
8110			/* Here we do NOT factor the r_mtu */
8111			if ((chk->send_size < (int)(mtu - omtu)) ||
8112			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8113				/*
8114				 * We probably should glom the mbuf chain
8115				 * from the chk->data for control but the
8116				 * problem is it becomes yet one more level
8117				 * of tracking to do if for some reason
8118				 * output fails. Then I have got to
8119				 * reconstruct the merged control chain.. el
8120				 * yucko.. for now we take the easy way and
8121				 * do the copy
8122				 */
8123				/*
8124				 * Add an AUTH chunk, if chunk requires it
8125				 * save the offset into the chain for AUTH
8126				 */
8127				if ((auth == NULL) &&
8128				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8129				    stcb->asoc.peer_auth_chunks))) {
8130					outchain = sctp_add_auth_chunk(outchain,
8131					    &endoutchain,
8132					    &auth,
8133					    &auth_offset,
8134					    stcb,
8135					    chk->rec.chunk_id.id);
8136					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8137				}
8138				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8139				    (int)chk->rec.chunk_id.can_take_data,
8140				    chk->send_size, chk->copy_by_ref);
8141				if (outchain == NULL) {
8142					*reason_code = 8;
8143					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8144					return (ENOMEM);
8145				}
8146				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8147				/* update our MTU size */
8148				if (mtu > (chk->send_size + omtu))
8149					mtu -= (chk->send_size + omtu);
8150				else
8151					mtu = 0;
8152				to_out += (chk->send_size + omtu);
8153				/* Do clear IP_DF ? */
8154				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8155					no_fragmentflg = 0;
8156				}
8157				if (chk->rec.chunk_id.can_take_data)
8158					chk->data = NULL;
8159				/*
8160				 * set hb flag since we can use these for
8161				 * RTO
8162				 */
8163				hbflag = 1;
8164				asconf = 1;
8165				/*
8166				 * should sysctl this: don't bundle data
8167				 * with ASCONF since it requires AUTH
8168				 */
8169				no_data_chunks = 1;
8170				chk->sent = SCTP_DATAGRAM_SENT;
8171				if (chk->whoTo == NULL) {
8172					chk->whoTo = net;
8173					atomic_add_int(&net->ref_count, 1);
8174				}
8175				chk->snd_count++;
8176				if (mtu == 0) {
8177					/*
8178					 * Ok we are out of room but we can
8179					 * output without effecting the
8180					 * flight size since this little guy
8181					 * is a control only packet.
8182					 */
8183					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8184					/*
8185					 * do NOT clear the asconf flag as
8186					 * it is used to do appropriate
8187					 * source address selection.
8188					 */
8189					if (*now_filled == 0) {
8190						(void)SCTP_GETTIME_TIMEVAL(now);
8191						*now_filled = 1;
8192					}
8193					net->last_sent_time = *now;
8194					hbflag = 0;
8195					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8196					    (struct sockaddr *)&net->ro._l_addr,
8197					    outchain, auth_offset, auth,
8198					    stcb->asoc.authinfo.active_keyid,
8199					    no_fragmentflg, 0, asconf,
8200					    inp->sctp_lport, stcb->rport,
8201					    htonl(stcb->asoc.peer_vtag),
8202					    net->port, NULL,
8203					    0, 0,
8204					    so_locked))) {
8205						/*
8206						 * error, we could not
8207						 * output
8208						 */
8209						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8210						if (from_where == 0) {
8211							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8212						}
8213						if (error == ENOBUFS) {
8214							asoc->ifp_had_enobuf = 1;
8215							SCTP_STAT_INCR(sctps_lowlevelerr);
8216						}
8217						/* error, could not output */
8218						if (error == EHOSTUNREACH) {
8219							/*
8220							 * Destination went
8221							 * unreachable
8222							 * during this send
8223							 */
8224							sctp_move_chunks_from_net(stcb, net);
8225						}
8226						*reason_code = 7;
8227						break;
8228					} else {
8229						asoc->ifp_had_enobuf = 0;
8230					}
8231					/*
8232					 * increase the number we sent, if a
8233					 * cookie is sent we don't tell them
8234					 * any was sent out.
8235					 */
8236					outchain = endoutchain = NULL;
8237					auth = NULL;
8238					auth_offset = 0;
8239					if (!no_out_cnt)
8240						*num_out += ctl_cnt;
8241					/* recalc a clean slate and setup */
8242					switch (net->ro._l_addr.sa.sa_family) {
8243#ifdef INET
8244					case AF_INET:
8245						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8246						break;
8247#endif
8248#ifdef INET6
8249					case AF_INET6:
8250						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8251						break;
8252#endif
8253					default:
8254						/* TSNH */
8255						mtu = net->mtu;
8256						break;
8257					}
8258					to_out = 0;
8259					no_fragmentflg = 1;
8260				}
8261			}
8262		}
8263		if (error != 0) {
8264			/* try next net */
8265			continue;
8266		}
8267		/************************/
8268		/* Control transmission */
8269		/************************/
8270		/* Now first lets go through the control queue */
8271		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8272			if ((sack_goes_to) &&
8273			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8274			    (chk->whoTo != sack_goes_to)) {
8275				/*
8276				 * if we have a sack in queue, and we are
8277				 * looking at an ecn echo that is NOT queued
8278				 * to where the sack is going..
8279				 */
8280				if (chk->whoTo == net) {
8281					/*
8282					 * Don't transmit it to where its
8283					 * going (current net)
8284					 */
8285					continue;
8286				} else if (sack_goes_to == net) {
8287					/*
8288					 * But do transmit it to this
8289					 * address
8290					 */
8291					goto skip_net_check;
8292				}
8293			}
8294			if (chk->whoTo == NULL) {
8295				if (asoc->alternate == NULL) {
8296					if (asoc->primary_destination != net) {
8297						continue;
8298					}
8299				} else {
8300					if (asoc->alternate != net) {
8301						continue;
8302					}
8303				}
8304			} else {
8305				if (chk->whoTo != net) {
8306					continue;
8307				}
8308			}
8309	skip_net_check:
8310			if (chk->data == NULL) {
8311				continue;
8312			}
8313			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8314				/*
8315				 * It must be unsent. Cookies and ASCONF's
8316				 * hang around but there timers will force
8317				 * when marked for resend.
8318				 */
8319				continue;
8320			}
8321			/*
8322			 * if no AUTH is yet included and this chunk
8323			 * requires it, make sure to account for it.  We
8324			 * don't apply the size until the AUTH chunk is
8325			 * actually added below in case there is no room for
8326			 * this chunk. NOTE: we overload the use of "omtu"
8327			 * here
8328			 */
8329			if ((auth == NULL) &&
8330			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8331			    stcb->asoc.peer_auth_chunks)) {
8332				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8333			} else
8334				omtu = 0;
8335			/* Here we do NOT factor the r_mtu */
8336			if ((chk->send_size <= (int)(mtu - omtu)) ||
8337			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8338				/*
8339				 * We probably should glom the mbuf chain
8340				 * from the chk->data for control but the
8341				 * problem is it becomes yet one more level
8342				 * of tracking to do if for some reason
8343				 * output fails. Then I have got to
8344				 * reconstruct the merged control chain.. el
8345				 * yucko.. for now we take the easy way and
8346				 * do the copy
8347				 */
8348				/*
8349				 * Add an AUTH chunk, if chunk requires it
8350				 * save the offset into the chain for AUTH
8351				 */
8352				if ((auth == NULL) &&
8353				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8354				    stcb->asoc.peer_auth_chunks))) {
8355					outchain = sctp_add_auth_chunk(outchain,
8356					    &endoutchain,
8357					    &auth,
8358					    &auth_offset,
8359					    stcb,
8360					    chk->rec.chunk_id.id);
8361					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8362				}
8363				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8364				    (int)chk->rec.chunk_id.can_take_data,
8365				    chk->send_size, chk->copy_by_ref);
8366				if (outchain == NULL) {
8367					*reason_code = 8;
8368					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8369					return (ENOMEM);
8370				}
8371				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8372				/* update our MTU size */
8373				if (mtu > (chk->send_size + omtu))
8374					mtu -= (chk->send_size + omtu);
8375				else
8376					mtu = 0;
8377				to_out += (chk->send_size + omtu);
8378				/* Do clear IP_DF ? */
8379				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8380					no_fragmentflg = 0;
8381				}
8382				if (chk->rec.chunk_id.can_take_data)
8383					chk->data = NULL;
8384				/* Mark things to be removed, if needed */
8385				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8386				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8387				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8388				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8389				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8390				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8391				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8392				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8393				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8394				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8395				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8396					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8397						hbflag = 1;
8398					}
8399					/* remove these chunks at the end */
8400					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8401					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8402						/* turn off the timer */
8403						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8404							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8405							    inp, stcb, net,
8406							    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8407						}
8408					}
8409					ctl_cnt++;
8410				} else {
8411					/*
8412					 * Other chunks, since they have
8413					 * timers running (i.e. COOKIE) we
8414					 * just "trust" that it gets sent or
8415					 * retransmitted.
8416					 */
8417					ctl_cnt++;
8418					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8419						cookie = 1;
8420						no_out_cnt = 1;
8421					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8422						/*
8423						 * Increment ecne send count
8424						 * here this means we may be
8425						 * over-zealous in our
8426						 * counting if the send
8427						 * fails, but its the best
8428						 * place to do it (we used
8429						 * to do it in the queue of
8430						 * the chunk, but that did
8431						 * not tell how many times
8432						 * it was sent.
8433						 */
8434						SCTP_STAT_INCR(sctps_sendecne);
8435					}
8436					chk->sent = SCTP_DATAGRAM_SENT;
8437					if (chk->whoTo == NULL) {
8438						chk->whoTo = net;
8439						atomic_add_int(&net->ref_count, 1);
8440					}
8441					chk->snd_count++;
8442				}
8443				if (mtu == 0) {
8444					/*
8445					 * Ok we are out of room but we can
8446					 * output without effecting the
8447					 * flight size since this little guy
8448					 * is a control only packet.
8449					 */
8450					if (asconf) {
8451						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8452						/*
8453						 * do NOT clear the asconf
8454						 * flag as it is used to do
8455						 * appropriate source
8456						 * address selection.
8457						 */
8458					}
8459					if (cookie) {
8460						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8461						cookie = 0;
8462					}
8463					/* Only HB or ASCONF advances time */
8464					if (hbflag) {
8465						if (*now_filled == 0) {
8466							(void)SCTP_GETTIME_TIMEVAL(now);
8467							*now_filled = 1;
8468						}
8469						net->last_sent_time = *now;
8470						hbflag = 0;
8471					}
8472					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8473					    (struct sockaddr *)&net->ro._l_addr,
8474					    outchain,
8475					    auth_offset, auth,
8476					    stcb->asoc.authinfo.active_keyid,
8477					    no_fragmentflg, 0, asconf,
8478					    inp->sctp_lport, stcb->rport,
8479					    htonl(stcb->asoc.peer_vtag),
8480					    net->port, NULL,
8481					    0, 0,
8482					    so_locked))) {
8483						/*
8484						 * error, we could not
8485						 * output
8486						 */
8487						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8488						if (from_where == 0) {
8489							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8490						}
8491						if (error == ENOBUFS) {
8492							asoc->ifp_had_enobuf = 1;
8493							SCTP_STAT_INCR(sctps_lowlevelerr);
8494						}
8495						if (error == EHOSTUNREACH) {
8496							/*
8497							 * Destination went
8498							 * unreachable
8499							 * during this send
8500							 */
8501							sctp_move_chunks_from_net(stcb, net);
8502						}
8503						*reason_code = 7;
8504						break;
8505					} else {
8506						asoc->ifp_had_enobuf = 0;
8507					}
8508					/*
8509					 * increase the number we sent, if a
8510					 * cookie is sent we don't tell them
8511					 * any was sent out.
8512					 */
8513					outchain = endoutchain = NULL;
8514					auth = NULL;
8515					auth_offset = 0;
8516					if (!no_out_cnt)
8517						*num_out += ctl_cnt;
8518					/* recalc a clean slate and setup */
8519					switch (net->ro._l_addr.sa.sa_family) {
8520#ifdef INET
8521					case AF_INET:
8522						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8523						break;
8524#endif
8525#ifdef INET6
8526					case AF_INET6:
8527						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8528						break;
8529#endif
8530					default:
8531						/* TSNH */
8532						mtu = net->mtu;
8533						break;
8534					}
8535					to_out = 0;
8536					no_fragmentflg = 1;
8537				}
8538			}
8539		}
8540		if (error != 0) {
8541			/* try next net */
8542			continue;
8543		}
8544		/* JRI: if dest is in PF state, do not send data to it */
8545		if ((asoc->sctp_cmt_on_off > 0) &&
8546		    (net != stcb->asoc.alternate) &&
8547		    (net->dest_state & SCTP_ADDR_PF)) {
8548			goto no_data_fill;
8549		}
8550		if (net->flight_size >= net->cwnd) {
8551			goto no_data_fill;
8552		}
8553		if ((asoc->sctp_cmt_on_off > 0) &&
8554		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8555		    (net->flight_size > max_rwnd_per_dest)) {
8556			goto no_data_fill;
8557		}
8558		/*
8559		 * We need a specific accounting for the usage of the send
8560		 * buffer. We also need to check the number of messages per
8561		 * net. For now, this is better than nothing and it disabled
8562		 * by default...
8563		 */
8564		if ((asoc->sctp_cmt_on_off > 0) &&
8565		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8566		    (max_send_per_dest > 0) &&
8567		    (net->flight_size > max_send_per_dest)) {
8568			goto no_data_fill;
8569		}
8570		/*********************/
8571		/* Data transmission */
8572		/*********************/
8573		/*
8574		 * if AUTH for DATA is required and no AUTH has been added
8575		 * yet, account for this in the mtu now... if no data can be
8576		 * bundled, this adjustment won't matter anyways since the
8577		 * packet will be going out...
8578		 */
8579		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8580		    stcb->asoc.peer_auth_chunks);
8581		if (data_auth_reqd && (auth == NULL)) {
8582			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8583		}
8584		/* now lets add any data within the MTU constraints */
8585		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8586#ifdef INET
8587		case AF_INET:
8588			if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8589				omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8590			else
8591				omtu = 0;
8592			break;
8593#endif
8594#ifdef INET6
8595		case AF_INET6:
8596			if (net->mtu > SCTP_MIN_OVERHEAD)
8597				omtu = net->mtu - SCTP_MIN_OVERHEAD;
8598			else
8599				omtu = 0;
8600			break;
8601#endif
8602		default:
8603			/* TSNH */
8604			omtu = 0;
8605			break;
8606		}
8607		if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8608		    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8609		    (skip_data_for_this_net == 0)) ||
8610		    (cookie)) {
8611			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8612				if (no_data_chunks) {
8613					/* let only control go out */
8614					*reason_code = 1;
8615					break;
8616				}
8617				if (net->flight_size >= net->cwnd) {
8618					/* skip this net, no room for data */
8619					*reason_code = 2;
8620					break;
8621				}
8622				if ((chk->whoTo != NULL) &&
8623				    (chk->whoTo != net)) {
8624					/* Don't send the chunk on this net */
8625					continue;
8626				}
8627				if (asoc->sctp_cmt_on_off == 0) {
8628					if ((asoc->alternate) &&
8629					    (asoc->alternate != net) &&
8630					    (chk->whoTo == NULL)) {
8631						continue;
8632					} else if ((net != asoc->primary_destination) &&
8633						    (asoc->alternate == NULL) &&
8634					    (chk->whoTo == NULL)) {
8635						continue;
8636					}
8637				}
8638				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8639					/*-
8640					 * strange, we have a chunk that is
8641					 * to big for its destination and
8642					 * yet no fragment ok flag.
8643					 * Something went wrong when the
8644					 * PMTU changed...we did not mark
8645					 * this chunk for some reason?? I
8646					 * will fix it here by letting IP
8647					 * fragment it for now and printing
8648					 * a warning. This really should not
8649					 * happen ...
8650					 */
8651					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8652					    chk->send_size, mtu);
8653					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8654				}
8655				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8656				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8657					struct sctp_data_chunk *dchkh;
8658
8659					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8660					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8661				}
8662				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8663				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8664					/* ok we will add this one */
8665
8666					/*
8667					 * Add an AUTH chunk, if chunk
8668					 * requires it, save the offset into
8669					 * the chain for AUTH
8670					 */
8671					if (data_auth_reqd) {
8672						if (auth == NULL) {
8673							outchain = sctp_add_auth_chunk(outchain,
8674							    &endoutchain,
8675							    &auth,
8676							    &auth_offset,
8677							    stcb,
8678							    SCTP_DATA);
8679							auth_keyid = chk->auth_keyid;
8680							override_ok = 0;
8681							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8682						} else if (override_ok) {
8683							/*
8684							 * use this data's
8685							 * keyid
8686							 */
8687							auth_keyid = chk->auth_keyid;
8688							override_ok = 0;
8689						} else if (auth_keyid != chk->auth_keyid) {
8690							/*
8691							 * different keyid,
8692							 * so done bundling
8693							 */
8694							break;
8695						}
8696					}
8697					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8698					    chk->send_size, chk->copy_by_ref);
8699					if (outchain == NULL) {
8700						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8701						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8702							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8703						}
8704						*reason_code = 3;
8705						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8706						return (ENOMEM);
8707					}
8708					/* upate our MTU size */
8709					/* Do clear IP_DF ? */
8710					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8711						no_fragmentflg = 0;
8712					}
8713					/* unsigned subtraction of mtu */
8714					if (mtu > chk->send_size)
8715						mtu -= chk->send_size;
8716					else
8717						mtu = 0;
8718					/* unsigned subtraction of r_mtu */
8719					if (r_mtu > chk->send_size)
8720						r_mtu -= chk->send_size;
8721					else
8722						r_mtu = 0;
8723
8724					to_out += chk->send_size;
8725					if ((to_out > mx_mtu) && no_fragmentflg) {
8726#ifdef INVARIANTS
8727						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8728#else
8729						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8730						    mx_mtu, to_out);
8731#endif
8732					}
8733					chk->window_probe = 0;
8734					data_list[bundle_at++] = chk;
8735					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8736						break;
8737					}
8738					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8739						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8740							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8741						} else {
8742							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8743						}
8744						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8745						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8746							/*
8747							 * Count number of
8748							 * user msg's that
8749							 * were fragmented
8750							 * we do this by
8751							 * counting when we
8752							 * see a LAST
8753							 * fragment only.
8754							 */
8755							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8756					}
8757					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8758						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8759							data_list[0]->window_probe = 1;
8760							net->window_probe = 1;
8761						}
8762						break;
8763					}
8764				} else {
8765					/*
8766					 * Must be sent in order of the
8767					 * TSN's (on a network)
8768					 */
8769					break;
8770				}
8771			}	/* for (chunk gather loop for this net) */
8772		}		/* if asoc.state OPEN */
8773no_data_fill:
8774		/* Is there something to send for this destination? */
8775		if (outchain) {
8776			/* We may need to start a control timer or two */
8777			if (asconf) {
8778				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8779				    stcb, net);
8780				/*
8781				 * do NOT clear the asconf flag as it is
8782				 * used to do appropriate source address
8783				 * selection.
8784				 */
8785			}
8786			if (cookie) {
8787				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8788				cookie = 0;
8789			}
8790			/* must start a send timer if data is being sent */
8791			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8792				/*
8793				 * no timer running on this destination
8794				 * restart it.
8795				 */
8796				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8797			}
8798			if (bundle_at || hbflag) {
8799				/* For data/asconf and hb set time */
8800				if (*now_filled == 0) {
8801					(void)SCTP_GETTIME_TIMEVAL(now);
8802					*now_filled = 1;
8803				}
8804				net->last_sent_time = *now;
8805			}
8806			/* Now send it, if there is anything to send :> */
8807			if ((error = sctp_lowlevel_chunk_output(inp,
8808			    stcb,
8809			    net,
8810			    (struct sockaddr *)&net->ro._l_addr,
8811			    outchain,
8812			    auth_offset,
8813			    auth,
8814			    auth_keyid,
8815			    no_fragmentflg,
8816			    bundle_at,
8817			    asconf,
8818			    inp->sctp_lport, stcb->rport,
8819			    htonl(stcb->asoc.peer_vtag),
8820			    net->port, NULL,
8821			    0, 0,
8822			    so_locked))) {
8823				/* error, we could not output */
8824				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8825				if (from_where == 0) {
8826					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8827				}
8828				if (error == ENOBUFS) {
8829					asoc->ifp_had_enobuf = 1;
8830					SCTP_STAT_INCR(sctps_lowlevelerr);
8831				}
8832				if (error == EHOSTUNREACH) {
8833					/*
8834					 * Destination went unreachable
8835					 * during this send
8836					 */
8837					sctp_move_chunks_from_net(stcb, net);
8838				}
8839				*reason_code = 6;
8840				/*-
8841				 * I add this line to be paranoid. As far as
8842				 * I can tell the continue, takes us back to
8843				 * the top of the for, but just to make sure
8844				 * I will reset these again here.
8845				 */
8846				ctl_cnt = bundle_at = 0;
8847				continue;	/* This takes us back to the
8848						 * for() for the nets. */
8849			} else {
8850				asoc->ifp_had_enobuf = 0;
8851			}
8852			endoutchain = NULL;
8853			auth = NULL;
8854			auth_offset = 0;
8855			if (!no_out_cnt) {
8856				*num_out += (ctl_cnt + bundle_at);
8857			}
8858			if (bundle_at) {
8859				/* setup for a RTO measurement */
8860				tsns_sent = data_list[0]->rec.data.tsn;
8861				/* fill time if not already filled */
8862				if (*now_filled == 0) {
8863					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8864					*now_filled = 1;
8865					*now = asoc->time_last_sent;
8866				} else {
8867					asoc->time_last_sent = *now;
8868				}
8869				if (net->rto_needed) {
8870					data_list[0]->do_rtt = 1;
8871					net->rto_needed = 0;
8872				}
8873				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8874				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8875			}
8876			if (one_chunk) {
8877				break;
8878			}
8879		}
8880		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8881			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8882		}
8883	}
8884	if (old_start_at == NULL) {
8885		old_start_at = start_at;
8886		start_at = TAILQ_FIRST(&asoc->nets);
8887		if (old_start_at)
8888			goto again_one_more_time;
8889	}
8890	/*
8891	 * At the end there should be no NON timed chunks hanging on this
8892	 * queue.
8893	 */
8894	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8895		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8896	}
8897	if ((*num_out == 0) && (*reason_code == 0)) {
8898		*reason_code = 4;
8899	} else {
8900		*reason_code = 5;
8901	}
8902	sctp_clean_up_ctl(stcb, asoc, so_locked);
8903	return (0);
8904}
8905
8906void
8907sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8908{
8909	/*-
8910	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8911	 * the control chunk queue.
8912	 */
8913	struct sctp_chunkhdr *hdr;
8914	struct sctp_tmit_chunk *chk;
8915	struct mbuf *mat, *last_mbuf;
8916	uint32_t chunk_length;
8917	uint16_t padding_length;
8918
8919	SCTP_TCB_LOCK_ASSERT(stcb);
8920	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8921	if (op_err == NULL) {
8922		return;
8923	}
8924	last_mbuf = NULL;
8925	chunk_length = 0;
8926	for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8927		chunk_length += SCTP_BUF_LEN(mat);
8928		if (SCTP_BUF_NEXT(mat) == NULL) {
8929			last_mbuf = mat;
8930		}
8931	}
8932	if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8933		sctp_m_freem(op_err);
8934		return;
8935	}
8936	padding_length = chunk_length % 4;
8937	if (padding_length != 0) {
8938		padding_length = 4 - padding_length;
8939	}
8940	if (padding_length != 0) {
8941		if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8942			sctp_m_freem(op_err);
8943			return;
8944		}
8945	}
8946	sctp_alloc_a_chunk(stcb, chk);
8947	if (chk == NULL) {
8948		/* no memory */
8949		sctp_m_freem(op_err);
8950		return;
8951	}
8952	chk->copy_by_ref = 0;
8953	chk->send_size = (uint16_t)chunk_length;
8954	chk->sent = SCTP_DATAGRAM_UNSENT;
8955	chk->snd_count = 0;
8956	chk->asoc = &stcb->asoc;
8957	chk->data = op_err;
8958	chk->whoTo = NULL;
8959	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8960	chk->rec.chunk_id.can_take_data = 0;
8961	hdr = mtod(op_err, struct sctp_chunkhdr *);
8962	hdr->chunk_type = SCTP_OPERATION_ERROR;
8963	hdr->chunk_flags = 0;
8964	hdr->chunk_length = htons(chk->send_size);
8965	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8966	chk->asoc->ctrl_queue_cnt++;
8967}
8968
8969int
8970sctp_send_cookie_echo(struct mbuf *m,
8971    int offset,
8972    struct sctp_tcb *stcb,
8973    struct sctp_nets *net)
8974{
8975	/*-
8976	 * pull out the cookie and put it at the front of the control chunk
8977	 * queue.
8978	 */
8979	int at;
8980	struct mbuf *cookie;
8981	struct sctp_paramhdr param, *phdr;
8982	struct sctp_chunkhdr *hdr;
8983	struct sctp_tmit_chunk *chk;
8984	uint16_t ptype, plen;
8985
8986	SCTP_TCB_LOCK_ASSERT(stcb);
8987	/* First find the cookie in the param area */
8988	cookie = NULL;
8989	at = offset + sizeof(struct sctp_init_chunk);
8990	for (;;) {
8991		phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8992		if (phdr == NULL) {
8993			return (-3);
8994		}
8995		ptype = ntohs(phdr->param_type);
8996		plen = ntohs(phdr->param_length);
8997		if (ptype == SCTP_STATE_COOKIE) {
8998			int pad;
8999
9000			/* found the cookie */
9001			if ((pad = (plen % 4))) {
9002				plen += 4 - pad;
9003			}
9004			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9005			if (cookie == NULL) {
9006				/* No memory */
9007				return (-2);
9008			}
9009#ifdef SCTP_MBUF_LOGGING
9010			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9011				sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9012			}
9013#endif
9014			break;
9015		}
9016		at += SCTP_SIZE32(plen);
9017	}
9018	/* ok, we got the cookie lets change it into a cookie echo chunk */
9019	/* first the change from param to cookie */
9020	hdr = mtod(cookie, struct sctp_chunkhdr *);
9021	hdr->chunk_type = SCTP_COOKIE_ECHO;
9022	hdr->chunk_flags = 0;
9023	/* get the chunk stuff now and place it in the FRONT of the queue */
9024	sctp_alloc_a_chunk(stcb, chk);
9025	if (chk == NULL) {
9026		/* no memory */
9027		sctp_m_freem(cookie);
9028		return (-5);
9029	}
9030	chk->copy_by_ref = 0;
9031	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9032	chk->rec.chunk_id.can_take_data = 0;
9033	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9034	chk->send_size = plen;
9035	chk->sent = SCTP_DATAGRAM_UNSENT;
9036	chk->snd_count = 0;
9037	chk->asoc = &stcb->asoc;
9038	chk->data = cookie;
9039	chk->whoTo = net;
9040	atomic_add_int(&chk->whoTo->ref_count, 1);
9041	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9042	chk->asoc->ctrl_queue_cnt++;
9043	return (0);
9044}
9045
9046void
9047sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9048    struct mbuf *m,
9049    int offset,
9050    int chk_length,
9051    struct sctp_nets *net)
9052{
9053	/*
9054	 * take a HB request and make it into a HB ack and send it.
9055	 */
9056	struct mbuf *outchain;
9057	struct sctp_chunkhdr *chdr;
9058	struct sctp_tmit_chunk *chk;
9059
9060
9061	if (net == NULL)
9062		/* must have a net pointer */
9063		return;
9064
9065	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9066	if (outchain == NULL) {
9067		/* gak out of memory */
9068		return;
9069	}
9070#ifdef SCTP_MBUF_LOGGING
9071	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9072		sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9073	}
9074#endif
9075	chdr = mtod(outchain, struct sctp_chunkhdr *);
9076	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9077	chdr->chunk_flags = 0;
9078	if (chk_length % 4) {
9079		/* need pad */
9080		uint32_t cpthis = 0;
9081		int padlen;
9082
9083		padlen = 4 - (chk_length % 4);
9084		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9085	}
9086	sctp_alloc_a_chunk(stcb, chk);
9087	if (chk == NULL) {
9088		/* no memory */
9089		sctp_m_freem(outchain);
9090		return;
9091	}
9092	chk->copy_by_ref = 0;
9093	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9094	chk->rec.chunk_id.can_take_data = 1;
9095	chk->flags = 0;
9096	chk->send_size = chk_length;
9097	chk->sent = SCTP_DATAGRAM_UNSENT;
9098	chk->snd_count = 0;
9099	chk->asoc = &stcb->asoc;
9100	chk->data = outchain;
9101	chk->whoTo = net;
9102	atomic_add_int(&chk->whoTo->ref_count, 1);
9103	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9104	chk->asoc->ctrl_queue_cnt++;
9105}
9106
9107void
9108sctp_send_cookie_ack(struct sctp_tcb *stcb)
9109{
9110	/* formulate and queue a cookie-ack back to sender */
9111	struct mbuf *cookie_ack;
9112	struct sctp_chunkhdr *hdr;
9113	struct sctp_tmit_chunk *chk;
9114
9115	SCTP_TCB_LOCK_ASSERT(stcb);
9116
9117	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9118	if (cookie_ack == NULL) {
9119		/* no mbuf's */
9120		return;
9121	}
9122	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9123	sctp_alloc_a_chunk(stcb, chk);
9124	if (chk == NULL) {
9125		/* no memory */
9126		sctp_m_freem(cookie_ack);
9127		return;
9128	}
9129	chk->copy_by_ref = 0;
9130	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9131	chk->rec.chunk_id.can_take_data = 1;
9132	chk->flags = 0;
9133	chk->send_size = sizeof(struct sctp_chunkhdr);
9134	chk->sent = SCTP_DATAGRAM_UNSENT;
9135	chk->snd_count = 0;
9136	chk->asoc = &stcb->asoc;
9137	chk->data = cookie_ack;
9138	if (chk->asoc->last_control_chunk_from != NULL) {
9139		chk->whoTo = chk->asoc->last_control_chunk_from;
9140		atomic_add_int(&chk->whoTo->ref_count, 1);
9141	} else {
9142		chk->whoTo = NULL;
9143	}
9144	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9145	hdr->chunk_type = SCTP_COOKIE_ACK;
9146	hdr->chunk_flags = 0;
9147	hdr->chunk_length = htons(chk->send_size);
9148	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9149	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9150	chk->asoc->ctrl_queue_cnt++;
9151	return;
9152}
9153
9154
9155void
9156sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9157{
9158	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9159	struct mbuf *m_shutdown_ack;
9160	struct sctp_shutdown_ack_chunk *ack_cp;
9161	struct sctp_tmit_chunk *chk;
9162
9163	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9164	if (m_shutdown_ack == NULL) {
9165		/* no mbuf's */
9166		return;
9167	}
9168	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9169	sctp_alloc_a_chunk(stcb, chk);
9170	if (chk == NULL) {
9171		/* no memory */
9172		sctp_m_freem(m_shutdown_ack);
9173		return;
9174	}
9175	chk->copy_by_ref = 0;
9176	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9177	chk->rec.chunk_id.can_take_data = 1;
9178	chk->flags = 0;
9179	chk->send_size = sizeof(struct sctp_chunkhdr);
9180	chk->sent = SCTP_DATAGRAM_UNSENT;
9181	chk->snd_count = 0;
9182	chk->flags = 0;
9183	chk->asoc = &stcb->asoc;
9184	chk->data = m_shutdown_ack;
9185	chk->whoTo = net;
9186	if (chk->whoTo) {
9187		atomic_add_int(&chk->whoTo->ref_count, 1);
9188	}
9189	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9190	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9191	ack_cp->ch.chunk_flags = 0;
9192	ack_cp->ch.chunk_length = htons(chk->send_size);
9193	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9194	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9195	chk->asoc->ctrl_queue_cnt++;
9196	return;
9197}
9198
9199void
9200sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9201{
9202	/* formulate and queue a SHUTDOWN to the sender */
9203	struct mbuf *m_shutdown;
9204	struct sctp_shutdown_chunk *shutdown_cp;
9205	struct sctp_tmit_chunk *chk;
9206
9207	TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9208		if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9209			/* We already have a SHUTDOWN queued. Reuse it. */
9210			if (chk->whoTo) {
9211				sctp_free_remote_addr(chk->whoTo);
9212				chk->whoTo = NULL;
9213			}
9214			break;
9215		}
9216	}
9217	if (chk == NULL) {
9218		m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9219		if (m_shutdown == NULL) {
9220			/* no mbuf's */
9221			return;
9222		}
9223		SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9224		sctp_alloc_a_chunk(stcb, chk);
9225		if (chk == NULL) {
9226			/* no memory */
9227			sctp_m_freem(m_shutdown);
9228			return;
9229		}
9230		chk->copy_by_ref = 0;
9231		chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9232		chk->rec.chunk_id.can_take_data = 1;
9233		chk->flags = 0;
9234		chk->send_size = sizeof(struct sctp_shutdown_chunk);
9235		chk->sent = SCTP_DATAGRAM_UNSENT;
9236		chk->snd_count = 0;
9237		chk->flags = 0;
9238		chk->asoc = &stcb->asoc;
9239		chk->data = m_shutdown;
9240		chk->whoTo = net;
9241		if (chk->whoTo) {
9242			atomic_add_int(&chk->whoTo->ref_count, 1);
9243		}
9244		shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9245		shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9246		shutdown_cp->ch.chunk_flags = 0;
9247		shutdown_cp->ch.chunk_length = htons(chk->send_size);
9248		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9249		SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9250		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9251		chk->asoc->ctrl_queue_cnt++;
9252	} else {
9253		TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9254		chk->whoTo = net;
9255		if (chk->whoTo) {
9256			atomic_add_int(&chk->whoTo->ref_count, 1);
9257		}
9258		shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9259		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9260		TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9261	}
9262	return;
9263}
9264
9265void
9266sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9267{
9268	/*
9269	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9270	 * should be queued on the assoc queue.
9271	 */
9272	struct sctp_tmit_chunk *chk;
9273	struct mbuf *m_asconf;
9274	int len;
9275
9276	SCTP_TCB_LOCK_ASSERT(stcb);
9277
9278	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9279	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9280		/* can't send a new one if there is one in flight already */
9281		return;
9282	}
9283	/* compose an ASCONF chunk, maximum length is PMTU */
9284	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9285	if (m_asconf == NULL) {
9286		return;
9287	}
9288	sctp_alloc_a_chunk(stcb, chk);
9289	if (chk == NULL) {
9290		/* no memory */
9291		sctp_m_freem(m_asconf);
9292		return;
9293	}
9294	chk->copy_by_ref = 0;
9295	chk->rec.chunk_id.id = SCTP_ASCONF;
9296	chk->rec.chunk_id.can_take_data = 0;
9297	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9298	chk->data = m_asconf;
9299	chk->send_size = len;
9300	chk->sent = SCTP_DATAGRAM_UNSENT;
9301	chk->snd_count = 0;
9302	chk->asoc = &stcb->asoc;
9303	chk->whoTo = net;
9304	if (chk->whoTo) {
9305		atomic_add_int(&chk->whoTo->ref_count, 1);
9306	}
9307	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9308	chk->asoc->ctrl_queue_cnt++;
9309	return;
9310}
9311
9312void
9313sctp_send_asconf_ack(struct sctp_tcb *stcb)
9314{
9315	/*
9316	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9317	 * must be stored in the tcb.
9318	 */
9319	struct sctp_tmit_chunk *chk;
9320	struct sctp_asconf_ack *ack, *latest_ack;
9321	struct mbuf *m_ack;
9322	struct sctp_nets *net = NULL;
9323
9324	SCTP_TCB_LOCK_ASSERT(stcb);
9325	/* Get the latest ASCONF-ACK */
9326	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9327	if (latest_ack == NULL) {
9328		return;
9329	}
9330	if (latest_ack->last_sent_to != NULL &&
9331	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9332		/* we're doing a retransmission */
9333		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9334		if (net == NULL) {
9335			/* no alternate */
9336			if (stcb->asoc.last_control_chunk_from == NULL) {
9337				if (stcb->asoc.alternate) {
9338					net = stcb->asoc.alternate;
9339				} else {
9340					net = stcb->asoc.primary_destination;
9341				}
9342			} else {
9343				net = stcb->asoc.last_control_chunk_from;
9344			}
9345		}
9346	} else {
9347		/* normal case */
9348		if (stcb->asoc.last_control_chunk_from == NULL) {
9349			if (stcb->asoc.alternate) {
9350				net = stcb->asoc.alternate;
9351			} else {
9352				net = stcb->asoc.primary_destination;
9353			}
9354		} else {
9355			net = stcb->asoc.last_control_chunk_from;
9356		}
9357	}
9358	latest_ack->last_sent_to = net;
9359
9360	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9361		if (ack->data == NULL) {
9362			continue;
9363		}
9364		/* copy the asconf_ack */
9365		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9366		if (m_ack == NULL) {
9367			/* couldn't copy it */
9368			return;
9369		}
9370#ifdef SCTP_MBUF_LOGGING
9371		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9372			sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9373		}
9374#endif
9375
9376		sctp_alloc_a_chunk(stcb, chk);
9377		if (chk == NULL) {
9378			/* no memory */
9379			if (m_ack)
9380				sctp_m_freem(m_ack);
9381			return;
9382		}
9383		chk->copy_by_ref = 0;
9384		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9385		chk->rec.chunk_id.can_take_data = 1;
9386		chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9387		chk->whoTo = net;
9388		if (chk->whoTo) {
9389			atomic_add_int(&chk->whoTo->ref_count, 1);
9390		}
9391		chk->data = m_ack;
9392		chk->send_size = ack->len;
9393		chk->sent = SCTP_DATAGRAM_UNSENT;
9394		chk->snd_count = 0;
9395		chk->asoc = &stcb->asoc;
9396
9397		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9398		chk->asoc->ctrl_queue_cnt++;
9399	}
9400	return;
9401}
9402
9403
9404static int
9405sctp_chunk_retransmission(struct sctp_inpcb *inp,
9406    struct sctp_tcb *stcb,
9407    struct sctp_association *asoc,
9408    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9409#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9410    SCTP_UNUSED
9411#endif
9412)
9413{
9414	/*-
9415	 * send out one MTU of retransmission. If fast_retransmit is
9416	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9417	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9418	 * retransmit them by themselves.
9419	 *
9420	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9421	 * marked for resend and bundle them all together (up to a MTU of
9422	 * destination). The address to send to should have been
9423	 * selected/changed where the retransmission was marked (i.e. in FR
9424	 * or t3-timeout routines).
9425	 */
9426	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9427	struct sctp_tmit_chunk *chk, *fwd;
9428	struct mbuf *m, *endofchain;
9429	struct sctp_nets *net = NULL;
9430	uint32_t tsns_sent = 0;
9431	int no_fragmentflg, bundle_at, cnt_thru;
9432	unsigned int mtu;
9433	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9434	struct sctp_auth_chunk *auth = NULL;
9435	uint32_t auth_offset = 0;
9436	uint16_t auth_keyid;
9437	int override_ok = 1;
9438	int data_auth_reqd = 0;
9439	uint32_t dmtu = 0;
9440
9441	SCTP_TCB_LOCK_ASSERT(stcb);
9442	tmr_started = ctl_cnt = bundle_at = error = 0;
9443	no_fragmentflg = 1;
9444	fwd_tsn = 0;
9445	*cnt_out = 0;
9446	fwd = NULL;
9447	endofchain = m = NULL;
9448	auth_keyid = stcb->asoc.authinfo.active_keyid;
9449#ifdef SCTP_AUDITING_ENABLED
9450	sctp_audit_log(0xC3, 1);
9451#endif
9452	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9453	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9454		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9455		    asoc->sent_queue_retran_cnt);
9456		asoc->sent_queue_cnt = 0;
9457		asoc->sent_queue_cnt_removeable = 0;
9458		/* send back 0/0 so we enter normal transmission */
9459		*cnt_out = 0;
9460		return (0);
9461	}
9462	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9463		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9464		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9465		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9466			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9467				continue;
9468			}
9469			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9470				if (chk != asoc->str_reset) {
9471					/*
9472					 * not eligible for retran if its
9473					 * not ours
9474					 */
9475					continue;
9476				}
9477			}
9478			ctl_cnt++;
9479			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9480				fwd_tsn = 1;
9481			}
9482			/*
9483			 * Add an AUTH chunk, if chunk requires it save the
9484			 * offset into the chain for AUTH
9485			 */
9486			if ((auth == NULL) &&
9487			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9488			    stcb->asoc.peer_auth_chunks))) {
9489				m = sctp_add_auth_chunk(m, &endofchain,
9490				    &auth, &auth_offset,
9491				    stcb,
9492				    chk->rec.chunk_id.id);
9493				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9494			}
9495			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9496			break;
9497		}
9498	}
9499	one_chunk = 0;
9500	cnt_thru = 0;
9501	/* do we have control chunks to retransmit? */
9502	if (m != NULL) {
9503		/* Start a timer no matter if we succeed or fail */
9504		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9505			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9506		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9507			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9508		chk->snd_count++;	/* update our count */
9509		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9510		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9511		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9512		    no_fragmentflg, 0, 0,
9513		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9514		    chk->whoTo->port, NULL,
9515		    0, 0,
9516		    so_locked))) {
9517			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9518			if (error == ENOBUFS) {
9519				asoc->ifp_had_enobuf = 1;
9520				SCTP_STAT_INCR(sctps_lowlevelerr);
9521			}
9522			return (error);
9523		} else {
9524			asoc->ifp_had_enobuf = 0;
9525		}
9526		endofchain = NULL;
9527		auth = NULL;
9528		auth_offset = 0;
9529		/*
9530		 * We don't want to mark the net->sent time here since this
9531		 * we use this for HB and retrans cannot measure RTT
9532		 */
9533		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9534		*cnt_out += 1;
9535		chk->sent = SCTP_DATAGRAM_SENT;
9536		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9537		if (fwd_tsn == 0) {
9538			return (0);
9539		} else {
9540			/* Clean up the fwd-tsn list */
9541			sctp_clean_up_ctl(stcb, asoc, so_locked);
9542			return (0);
9543		}
9544	}
9545	/*
9546	 * Ok, it is just data retransmission we need to do or that and a
9547	 * fwd-tsn with it all.
9548	 */
9549	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9550		return (SCTP_RETRAN_DONE);
9551	}
9552	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9553	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9554		/* not yet open, resend the cookie and that is it */
9555		return (1);
9556	}
9557#ifdef SCTP_AUDITING_ENABLED
9558	sctp_auditing(20, inp, stcb, NULL);
9559#endif
9560	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9561	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9562		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9563			/* No, not sent to this net or not ready for rtx */
9564			continue;
9565		}
9566		if (chk->data == NULL) {
9567			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9568			    chk->rec.data.tsn, chk->snd_count, chk->sent);
9569			continue;
9570		}
9571		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9572		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9573			struct mbuf *op_err;
9574			char msg[SCTP_DIAG_INFO_LEN];
9575
9576			snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9577			    chk->rec.data.tsn, chk->snd_count);
9578			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9579			    msg);
9580			atomic_add_int(&stcb->asoc.refcnt, 1);
9581			sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9582			    so_locked);
9583			SCTP_TCB_LOCK(stcb);
9584			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9585			return (SCTP_RETRAN_EXIT);
9586		}
9587		/* pick up the net */
9588		net = chk->whoTo;
9589		switch (net->ro._l_addr.sa.sa_family) {
9590#ifdef INET
9591		case AF_INET:
9592			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9593			break;
9594#endif
9595#ifdef INET6
9596		case AF_INET6:
9597			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9598			break;
9599#endif
9600		default:
9601			/* TSNH */
9602			mtu = net->mtu;
9603			break;
9604		}
9605
9606		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9607			/* No room in peers rwnd */
9608			uint32_t tsn;
9609
9610			tsn = asoc->last_acked_seq + 1;
9611			if (tsn == chk->rec.data.tsn) {
9612				/*
9613				 * we make a special exception for this
9614				 * case. The peer has no rwnd but is missing
9615				 * the lowest chunk.. which is probably what
9616				 * is holding up the rwnd.
9617				 */
9618				goto one_chunk_around;
9619			}
9620			return (1);
9621		}
9622one_chunk_around:
9623		if (asoc->peers_rwnd < mtu) {
9624			one_chunk = 1;
9625			if ((asoc->peers_rwnd == 0) &&
9626			    (asoc->total_flight == 0)) {
9627				chk->window_probe = 1;
9628				chk->whoTo->window_probe = 1;
9629			}
9630		}
9631#ifdef SCTP_AUDITING_ENABLED
9632		sctp_audit_log(0xC3, 2);
9633#endif
9634		bundle_at = 0;
9635		m = NULL;
9636		net->fast_retran_ip = 0;
9637		if (chk->rec.data.doing_fast_retransmit == 0) {
9638			/*
9639			 * if no FR in progress skip destination that have
9640			 * flight_size > cwnd.
9641			 */
9642			if (net->flight_size >= net->cwnd) {
9643				continue;
9644			}
9645		} else {
9646			/*
9647			 * Mark the destination net to have FR recovery
9648			 * limits put on it.
9649			 */
9650			*fr_done = 1;
9651			net->fast_retran_ip = 1;
9652		}
9653
9654		/*
9655		 * if no AUTH is yet included and this chunk requires it,
9656		 * make sure to account for it.  We don't apply the size
9657		 * until the AUTH chunk is actually added below in case
9658		 * there is no room for this chunk.
9659		 */
9660		if (data_auth_reqd && (auth == NULL)) {
9661			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9662		} else
9663			dmtu = 0;
9664
9665		if ((chk->send_size <= (mtu - dmtu)) ||
9666		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9667			/* ok we will add this one */
9668			if (data_auth_reqd) {
9669				if (auth == NULL) {
9670					m = sctp_add_auth_chunk(m,
9671					    &endofchain,
9672					    &auth,
9673					    &auth_offset,
9674					    stcb,
9675					    SCTP_DATA);
9676					auth_keyid = chk->auth_keyid;
9677					override_ok = 0;
9678					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9679				} else if (override_ok) {
9680					auth_keyid = chk->auth_keyid;
9681					override_ok = 0;
9682				} else if (chk->auth_keyid != auth_keyid) {
9683					/* different keyid, so done bundling */
9684					break;
9685				}
9686			}
9687			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9688			if (m == NULL) {
9689				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9690				return (ENOMEM);
9691			}
9692			/* Do clear IP_DF ? */
9693			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9694				no_fragmentflg = 0;
9695			}
9696			/* upate our MTU size */
9697			if (mtu > (chk->send_size + dmtu))
9698				mtu -= (chk->send_size + dmtu);
9699			else
9700				mtu = 0;
9701			data_list[bundle_at++] = chk;
9702			if (one_chunk && (asoc->total_flight <= 0)) {
9703				SCTP_STAT_INCR(sctps_windowprobed);
9704			}
9705		}
9706		if (one_chunk == 0) {
9707			/*
9708			 * now are there anymore forward from chk to pick
9709			 * up?
9710			 */
9711			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9712				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9713					/* Nope, not for retran */
9714					continue;
9715				}
9716				if (fwd->whoTo != net) {
9717					/* Nope, not the net in question */
9718					continue;
9719				}
9720				if (data_auth_reqd && (auth == NULL)) {
9721					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9722				} else
9723					dmtu = 0;
9724				if (fwd->send_size <= (mtu - dmtu)) {
9725					if (data_auth_reqd) {
9726						if (auth == NULL) {
9727							m = sctp_add_auth_chunk(m,
9728							    &endofchain,
9729							    &auth,
9730							    &auth_offset,
9731							    stcb,
9732							    SCTP_DATA);
9733							auth_keyid = fwd->auth_keyid;
9734							override_ok = 0;
9735							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9736						} else if (override_ok) {
9737							auth_keyid = fwd->auth_keyid;
9738							override_ok = 0;
9739						} else if (fwd->auth_keyid != auth_keyid) {
9740							/*
9741							 * different keyid,
9742							 * so done bundling
9743							 */
9744							break;
9745						}
9746					}
9747					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9748					if (m == NULL) {
9749						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9750						return (ENOMEM);
9751					}
9752					/* Do clear IP_DF ? */
9753					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9754						no_fragmentflg = 0;
9755					}
9756					/* upate our MTU size */
9757					if (mtu > (fwd->send_size + dmtu))
9758						mtu -= (fwd->send_size + dmtu);
9759					else
9760						mtu = 0;
9761					data_list[bundle_at++] = fwd;
9762					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9763						break;
9764					}
9765				} else {
9766					/* can't fit so we are done */
9767					break;
9768				}
9769			}
9770		}
9771		/* Is there something to send for this destination? */
9772		if (m) {
9773			/*
9774			 * No matter if we fail/or succeed we should start a
9775			 * timer. A failure is like a lost IP packet :-)
9776			 */
9777			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9778				/*
9779				 * no timer running on this destination
9780				 * restart it.
9781				 */
9782				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9783				tmr_started = 1;
9784			}
9785			/* Now lets send it, if there is anything to send :> */
9786			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9787			    (struct sockaddr *)&net->ro._l_addr, m,
9788			    auth_offset, auth, auth_keyid,
9789			    no_fragmentflg, 0, 0,
9790			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9791			    net->port, NULL,
9792			    0, 0,
9793			    so_locked))) {
9794				/* error, we could not output */
9795				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9796				if (error == ENOBUFS) {
9797					asoc->ifp_had_enobuf = 1;
9798					SCTP_STAT_INCR(sctps_lowlevelerr);
9799				}
9800				return (error);
9801			} else {
9802				asoc->ifp_had_enobuf = 0;
9803			}
9804			endofchain = NULL;
9805			auth = NULL;
9806			auth_offset = 0;
9807			/* For HB's */
9808			/*
9809			 * We don't want to mark the net->sent time here
9810			 * since this we use this for HB and retrans cannot
9811			 * measure RTT
9812			 */
9813			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9814
9815			/* For auto-close */
9816			cnt_thru++;
9817			if (*now_filled == 0) {
9818				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9819				*now = asoc->time_last_sent;
9820				*now_filled = 1;
9821			} else {
9822				asoc->time_last_sent = *now;
9823			}
9824			*cnt_out += bundle_at;
9825#ifdef SCTP_AUDITING_ENABLED
9826			sctp_audit_log(0xC4, bundle_at);
9827#endif
9828			if (bundle_at) {
9829				tsns_sent = data_list[0]->rec.data.tsn;
9830			}
9831			for (i = 0; i < bundle_at; i++) {
9832				SCTP_STAT_INCR(sctps_sendretransdata);
9833				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9834				/*
9835				 * When we have a revoked data, and we
9836				 * retransmit it, then we clear the revoked
9837				 * flag since this flag dictates if we
9838				 * subtracted from the fs
9839				 */
9840				if (data_list[i]->rec.data.chunk_was_revoked) {
9841					/* Deflate the cwnd */
9842					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9843					data_list[i]->rec.data.chunk_was_revoked = 0;
9844				}
9845				data_list[i]->snd_count++;
9846				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9847				/* record the time */
9848				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9849				if (data_list[i]->book_size_scale) {
9850					/*
9851					 * need to double the book size on
9852					 * this one
9853					 */
9854					data_list[i]->book_size_scale = 0;
9855					/*
9856					 * Since we double the booksize, we
9857					 * must also double the output queue
9858					 * size, since this get shrunk when
9859					 * we free by this amount.
9860					 */
9861					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9862					data_list[i]->book_size *= 2;
9863
9864
9865				} else {
9866					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9867						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9868						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9869					}
9870					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9871					    (uint32_t)(data_list[i]->send_size +
9872					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9873				}
9874				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9875					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9876					    data_list[i]->whoTo->flight_size,
9877					    data_list[i]->book_size,
9878					    (uint32_t)(uintptr_t)data_list[i]->whoTo,
9879					    data_list[i]->rec.data.tsn);
9880				}
9881				sctp_flight_size_increase(data_list[i]);
9882				sctp_total_flight_increase(stcb, data_list[i]);
9883				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9884					/* SWS sender side engages */
9885					asoc->peers_rwnd = 0;
9886				}
9887				if ((i == 0) &&
9888				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9889					SCTP_STAT_INCR(sctps_sendfastretrans);
9890					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9891					    (tmr_started == 0)) {
9892						/*-
9893						 * ok we just fast-retrans'd
9894						 * the lowest TSN, i.e the
9895						 * first on the list. In
9896						 * this case we want to give
9897						 * some more time to get a
9898						 * SACK back without a
9899						 * t3-expiring.
9900						 */
9901						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9902						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9903						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9904					}
9905				}
9906			}
9907			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9908				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9909			}
9910#ifdef SCTP_AUDITING_ENABLED
9911			sctp_auditing(21, inp, stcb, NULL);
9912#endif
9913		} else {
9914			/* None will fit */
9915			return (1);
9916		}
9917		if (asoc->sent_queue_retran_cnt <= 0) {
9918			/* all done we have no more to retran */
9919			asoc->sent_queue_retran_cnt = 0;
9920			break;
9921		}
9922		if (one_chunk) {
9923			/* No more room in rwnd */
9924			return (1);
9925		}
9926		/* stop the for loop here. we sent out a packet */
9927		break;
9928	}
9929	return (0);
9930}
9931
9932static void
9933sctp_timer_validation(struct sctp_inpcb *inp,
9934    struct sctp_tcb *stcb,
9935    struct sctp_association *asoc)
9936{
9937	struct sctp_nets *net;
9938
9939	/* Validate that a timer is running somewhere */
9940	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9941		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9942			/* Here is a timer */
9943			return;
9944		}
9945	}
9946	SCTP_TCB_LOCK_ASSERT(stcb);
9947	/* Gak, we did not have a timer somewhere */
9948	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9949	if (asoc->alternate) {
9950		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9951	} else {
9952		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9953	}
9954	return;
9955}
9956
9957void
9958sctp_chunk_output(struct sctp_inpcb *inp,
9959    struct sctp_tcb *stcb,
9960    int from_where,
9961    int so_locked
9962#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9963    SCTP_UNUSED
9964#endif
9965)
9966{
9967	/*-
9968	 * Ok this is the generic chunk service queue. we must do the
9969	 * following:
9970	 * - See if there are retransmits pending, if so we must
9971	 *   do these first.
9972	 * - Service the stream queue that is next, moving any
9973	 *   message (note I must get a complete message i.e.
9974	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9975	 *   TSN's
9976	 * - Check to see if the cwnd/rwnd allows any output, if so we
9977	 *   go ahead and fomulate and send the low level chunks. Making sure
9978	 *   to combine any control in the control chunk queue also.
9979	 */
9980	struct sctp_association *asoc;
9981	struct sctp_nets *net;
9982	int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9983	unsigned int burst_cnt = 0;
9984	struct timeval now;
9985	int now_filled = 0;
9986	int nagle_on;
9987	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9988	int un_sent = 0;
9989	int fr_done;
9990	unsigned int tot_frs = 0;
9991
9992	asoc = &stcb->asoc;
9993do_it_again:
9994	/* The Nagle algorithm is only applied when handling a send call. */
9995	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9996		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9997			nagle_on = 0;
9998		} else {
9999			nagle_on = 1;
10000		}
10001	} else {
10002		nagle_on = 0;
10003	}
10004	SCTP_TCB_LOCK_ASSERT(stcb);
10005
10006	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10007
10008	if ((un_sent <= 0) &&
10009	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10010	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10011	    (asoc->sent_queue_retran_cnt == 0) &&
10012	    (asoc->trigger_reset == 0)) {
10013		/* Nothing to do unless there is something to be sent left */
10014		return;
10015	}
10016	/*
10017	 * Do we have something to send, data or control AND a sack timer
10018	 * running, if so piggy-back the sack.
10019	 */
10020	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10021		sctp_send_sack(stcb, so_locked);
10022		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10023	}
10024	while (asoc->sent_queue_retran_cnt) {
10025		/*-
10026		 * Ok, it is retransmission time only, we send out only ONE
10027		 * packet with a single call off to the retran code.
10028		 */
10029		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10030			/*-
10031			 * Special hook for handling cookiess discarded
10032			 * by peer that carried data. Send cookie-ack only
10033			 * and then the next call with get the retran's.
10034			 */
10035			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10036			    from_where,
10037			    &now, &now_filled, frag_point, so_locked);
10038			return;
10039		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10040			/* if its not from a HB then do it */
10041			fr_done = 0;
10042			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10043			if (fr_done) {
10044				tot_frs++;
10045			}
10046		} else {
10047			/*
10048			 * its from any other place, we don't allow retran
10049			 * output (only control)
10050			 */
10051			ret = 1;
10052		}
10053		if (ret > 0) {
10054			/* Can't send anymore */
10055			/*-
10056			 * now lets push out control by calling med-level
10057			 * output once. this assures that we WILL send HB's
10058			 * if queued too.
10059			 */
10060			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10061			    from_where,
10062			    &now, &now_filled, frag_point, so_locked);
10063#ifdef SCTP_AUDITING_ENABLED
10064			sctp_auditing(8, inp, stcb, NULL);
10065#endif
10066			sctp_timer_validation(inp, stcb, asoc);
10067			return;
10068		}
10069		if (ret < 0) {
10070			/*-
10071			 * The count was off.. retran is not happening so do
10072			 * the normal retransmission.
10073			 */
10074#ifdef SCTP_AUDITING_ENABLED
10075			sctp_auditing(9, inp, stcb, NULL);
10076#endif
10077			if (ret == SCTP_RETRAN_EXIT) {
10078				return;
10079			}
10080			break;
10081		}
10082		if (from_where == SCTP_OUTPUT_FROM_T3) {
10083			/* Only one transmission allowed out of a timeout */
10084#ifdef SCTP_AUDITING_ENABLED
10085			sctp_auditing(10, inp, stcb, NULL);
10086#endif
10087			/* Push out any control */
10088			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10089			    &now, &now_filled, frag_point, so_locked);
10090			return;
10091		}
10092		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10093			/* Hit FR burst limit */
10094			return;
10095		}
10096		if ((num_out == 0) && (ret == 0)) {
10097			/* No more retrans to send */
10098			break;
10099		}
10100	}
10101#ifdef SCTP_AUDITING_ENABLED
10102	sctp_auditing(12, inp, stcb, NULL);
10103#endif
10104	/* Check for bad destinations, if they exist move chunks around. */
10105	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10106		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10107			/*-
10108			 * if possible move things off of this address we
10109			 * still may send below due to the dormant state but
10110			 * we try to find an alternate address to send to
10111			 * and if we have one we move all queued data on the
10112			 * out wheel to this alternate address.
10113			 */
10114			if (net->ref_count > 1)
10115				sctp_move_chunks_from_net(stcb, net);
10116		} else {
10117			/*-
10118			 * if ((asoc->sat_network) || (net->addr_is_local))
10119			 * { burst_limit = asoc->max_burst *
10120			 * SCTP_SAT_NETWORK_BURST_INCR; }
10121			 */
10122			if (asoc->max_burst > 0) {
10123				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10124					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10125						/*
10126						 * JRS - Use the congestion
10127						 * control given in the
10128						 * congestion control module
10129						 */
10130						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10131						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10132							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10133						}
10134						SCTP_STAT_INCR(sctps_maxburstqueued);
10135					}
10136					net->fast_retran_ip = 0;
10137				} else {
10138					if (net->flight_size == 0) {
10139						/*
10140						 * Should be decaying the
10141						 * cwnd here
10142						 */
10143						;
10144					}
10145				}
10146			}
10147		}
10148
10149	}
10150	burst_cnt = 0;
10151	do {
10152		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10153		    &reason_code, 0, from_where,
10154		    &now, &now_filled, frag_point, so_locked);
10155		if (error) {
10156			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10157			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10158				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10159			}
10160			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10161				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10162				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10163			}
10164			break;
10165		}
10166		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10167
10168		tot_out += num_out;
10169		burst_cnt++;
10170		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10171			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10172			if (num_out == 0) {
10173				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10174			}
10175		}
10176		if (nagle_on) {
10177			/*
10178			 * When the Nagle algorithm is used, look at how
10179			 * much is unsent, then if its smaller than an MTU
10180			 * and we have data in flight we stop, except if we
10181			 * are handling a fragmented user message.
10182			 */
10183			un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10184			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10185			    (stcb->asoc.total_flight > 0)) {
10186/*	&&		     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10187				break;
10188			}
10189		}
10190		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10191		    TAILQ_EMPTY(&asoc->send_queue) &&
10192		    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10193			/* Nothing left to send */
10194			break;
10195		}
10196		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10197			/* Nothing left to send */
10198			break;
10199		}
10200	} while (num_out &&
10201	    ((asoc->max_burst == 0) ||
10202	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10203	    (burst_cnt < asoc->max_burst)));
10204
10205	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10206		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10207			SCTP_STAT_INCR(sctps_maxburstqueued);
10208			asoc->burst_limit_applied = 1;
10209			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10210				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10211			}
10212		} else {
10213			asoc->burst_limit_applied = 0;
10214		}
10215	}
10216	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10217		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10218	}
10219	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10220	    tot_out);
10221
10222	/*-
10223	 * Now we need to clean up the control chunk chain if a ECNE is on
10224	 * it. It must be marked as UNSENT again so next call will continue
10225	 * to send it until such time that we get a CWR, to remove it.
10226	 */
10227	if (stcb->asoc.ecn_echo_cnt_onq)
10228		sctp_fix_ecn_echo(asoc);
10229
10230	if (stcb->asoc.trigger_reset) {
10231		if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10232			goto do_it_again;
10233		}
10234	}
10235	return;
10236}
10237
10238
10239int
10240sctp_output(
10241    struct sctp_inpcb *inp,
10242    struct mbuf *m,
10243    struct sockaddr *addr,
10244    struct mbuf *control,
10245    struct thread *p,
10246    int flags)
10247{
10248	if (inp == NULL) {
10249		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10250		return (EINVAL);
10251	}
10252	if (inp->sctp_socket == NULL) {
10253		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10254		return (EINVAL);
10255	}
10256	return (sctp_sosend(inp->sctp_socket,
10257	    addr,
10258	    (struct uio *)NULL,
10259	    m,
10260	    control,
10261	    flags, p
10262	    ));
10263}
10264
10265void
10266send_forward_tsn(struct sctp_tcb *stcb,
10267    struct sctp_association *asoc)
10268{
10269	struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10270	struct sctp_forward_tsn_chunk *fwdtsn;
10271	struct sctp_strseq *strseq;
10272	struct sctp_strseq_mid *strseq_m;
10273	uint32_t advance_peer_ack_point;
10274	unsigned int cnt_of_space, i, ovh;
10275	unsigned int space_needed;
10276	unsigned int cnt_of_skipped = 0;
10277
10278	SCTP_TCB_LOCK_ASSERT(stcb);
10279	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10280		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10281			/* mark it to unsent */
10282			chk->sent = SCTP_DATAGRAM_UNSENT;
10283			chk->snd_count = 0;
10284			/* Do we correct its output location? */
10285			if (chk->whoTo) {
10286				sctp_free_remote_addr(chk->whoTo);
10287				chk->whoTo = NULL;
10288			}
10289			goto sctp_fill_in_rest;
10290		}
10291	}
10292	/* Ok if we reach here we must build one */
10293	sctp_alloc_a_chunk(stcb, chk);
10294	if (chk == NULL) {
10295		return;
10296	}
10297	asoc->fwd_tsn_cnt++;
10298	chk->copy_by_ref = 0;
10299	/*
10300	 * We don't do the old thing here since this is used not for on-wire
10301	 * but to tell if we are sending a fwd-tsn by the stack during
10302	 * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10303	 */
10304	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10305	chk->rec.chunk_id.can_take_data = 0;
10306	chk->flags = 0;
10307	chk->asoc = asoc;
10308	chk->whoTo = NULL;
10309	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10310	if (chk->data == NULL) {
10311		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10312		return;
10313	}
10314	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10315	chk->sent = SCTP_DATAGRAM_UNSENT;
10316	chk->snd_count = 0;
10317	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10318	asoc->ctrl_queue_cnt++;
10319sctp_fill_in_rest:
10320	/*-
10321	 * Here we go through and fill out the part that deals with
10322	 * stream/seq of the ones we skip.
10323	 */
10324	SCTP_BUF_LEN(chk->data) = 0;
10325	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10326		if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10327		    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10328			/* no more to look at */
10329			break;
10330		}
10331		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10332			/* We don't report these */
10333			continue;
10334		}
10335		cnt_of_skipped++;
10336	}
10337	if (asoc->idata_supported) {
10338		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10339		    (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10340	} else {
10341		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10342		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10343	}
10344	cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10345
10346	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10347		ovh = SCTP_MIN_OVERHEAD;
10348	} else {
10349		ovh = SCTP_MIN_V4_OVERHEAD;
10350	}
10351	if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10352		/* trim to a mtu size */
10353		cnt_of_space = asoc->smallest_mtu - ovh;
10354	}
10355	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10356		sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10357		    0xff, 0, cnt_of_skipped,
10358		    asoc->advanced_peer_ack_point);
10359	}
10360	advance_peer_ack_point = asoc->advanced_peer_ack_point;
10361	if (cnt_of_space < space_needed) {
10362		/*-
10363		 * ok we must trim down the chunk by lowering the
10364		 * advance peer ack point.
10365		 */
10366		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10367			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10368			    0xff, 0xff, cnt_of_space,
10369			    space_needed);
10370		}
10371		cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10372		if (asoc->idata_supported) {
10373			cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10374		} else {
10375			cnt_of_skipped /= sizeof(struct sctp_strseq);
10376		}
10377		/*-
10378		 * Go through and find the TSN that will be the one
10379		 * we report.
10380		 */
10381		at = TAILQ_FIRST(&asoc->sent_queue);
10382		if (at != NULL) {
10383			for (i = 0; i < cnt_of_skipped; i++) {
10384				tp1 = TAILQ_NEXT(at, sctp_next);
10385				if (tp1 == NULL) {
10386					break;
10387				}
10388				at = tp1;
10389			}
10390		}
10391		if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10392			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10393			    0xff, cnt_of_skipped, at->rec.data.tsn,
10394			    asoc->advanced_peer_ack_point);
10395		}
10396		last = at;
10397		/*-
10398		 * last now points to last one I can report, update
10399		 * peer ack point
10400		 */
10401		if (last) {
10402			advance_peer_ack_point = last->rec.data.tsn;
10403		}
10404		if (asoc->idata_supported) {
10405			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10406			    cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10407		} else {
10408			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10409			    cnt_of_skipped * sizeof(struct sctp_strseq);
10410		}
10411	}
10412	chk->send_size = space_needed;
10413	/* Setup the chunk */
10414	fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10415	fwdtsn->ch.chunk_length = htons(chk->send_size);
10416	fwdtsn->ch.chunk_flags = 0;
10417	if (asoc->idata_supported) {
10418		fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10419	} else {
10420		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10421	}
10422	fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10423	SCTP_BUF_LEN(chk->data) = chk->send_size;
10424	fwdtsn++;
10425	/*-
10426	 * Move pointer to after the fwdtsn and transfer to the
10427	 * strseq pointer.
10428	 */
10429	if (asoc->idata_supported) {
10430		strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10431		strseq = NULL;
10432	} else {
10433		strseq = (struct sctp_strseq *)fwdtsn;
10434		strseq_m = NULL;
10435	}
10436	/*-
10437	 * Now populate the strseq list. This is done blindly
10438	 * without pulling out duplicate stream info. This is
10439	 * inefficent but won't harm the process since the peer will
10440	 * look at these in sequence and will thus release anything.
10441	 * It could mean we exceed the PMTU and chop off some that
10442	 * we could have included.. but this is unlikely (aka 1432/4
10443	 * would mean 300+ stream seq's would have to be reported in
10444	 * one FWD-TSN. With a bit of work we can later FIX this to
10445	 * optimize and pull out duplicates.. but it does add more
10446	 * overhead. So for now... not!
10447	 */
10448	i = 0;
10449	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10450		if (i >= cnt_of_skipped) {
10451			break;
10452		}
10453		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10454			/* We don't report these */
10455			continue;
10456		}
10457		if (at->rec.data.tsn == advance_peer_ack_point) {
10458			at->rec.data.fwd_tsn_cnt = 0;
10459		}
10460		if (asoc->idata_supported) {
10461			strseq_m->sid = htons(at->rec.data.sid);
10462			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10463				strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10464			} else {
10465				strseq_m->flags = 0;
10466			}
10467			strseq_m->mid = htonl(at->rec.data.mid);
10468			strseq_m++;
10469		} else {
10470			strseq->sid = htons(at->rec.data.sid);
10471			strseq->ssn = htons((uint16_t)at->rec.data.mid);
10472			strseq++;
10473		}
10474		i++;
10475	}
10476	return;
10477}
10478
10479void
10480sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10481#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10482    SCTP_UNUSED
10483#endif
10484)
10485{
10486	/*-
10487	 * Queue up a SACK or NR-SACK in the control queue.
10488	 * We must first check to see if a SACK or NR-SACK is
10489	 * somehow on the control queue.
10490	 * If so, we will take and and remove the old one.
10491	 */
10492	struct sctp_association *asoc;
10493	struct sctp_tmit_chunk *chk, *a_chk;
10494	struct sctp_sack_chunk *sack;
10495	struct sctp_nr_sack_chunk *nr_sack;
10496	struct sctp_gap_ack_block *gap_descriptor;
10497	const struct sack_track *selector;
10498	int mergeable = 0;
10499	int offset;
10500	caddr_t limit;
10501	uint32_t *dup;
10502	int limit_reached = 0;
10503	unsigned int i, siz, j;
10504	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10505	int num_dups = 0;
10506	int space_req;
10507	uint32_t highest_tsn;
10508	uint8_t flags;
10509	uint8_t type;
10510	uint8_t tsn_map;
10511
10512	if (stcb->asoc.nrsack_supported == 1) {
10513		type = SCTP_NR_SELECTIVE_ACK;
10514	} else {
10515		type = SCTP_SELECTIVE_ACK;
10516	}
10517	a_chk = NULL;
10518	asoc = &stcb->asoc;
10519	SCTP_TCB_LOCK_ASSERT(stcb);
10520	if (asoc->last_data_chunk_from == NULL) {
10521		/* Hmm we never received anything */
10522		return;
10523	}
10524	sctp_slide_mapping_arrays(stcb);
10525	sctp_set_rwnd(stcb, asoc);
10526	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10527		if (chk->rec.chunk_id.id == type) {
10528			/* Hmm, found a sack already on queue, remove it */
10529			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10530			asoc->ctrl_queue_cnt--;
10531			a_chk = chk;
10532			if (a_chk->data) {
10533				sctp_m_freem(a_chk->data);
10534				a_chk->data = NULL;
10535			}
10536			if (a_chk->whoTo) {
10537				sctp_free_remote_addr(a_chk->whoTo);
10538				a_chk->whoTo = NULL;
10539			}
10540			break;
10541		}
10542	}
10543	if (a_chk == NULL) {
10544		sctp_alloc_a_chunk(stcb, a_chk);
10545		if (a_chk == NULL) {
10546			/* No memory so we drop the idea, and set a timer */
10547			if (stcb->asoc.delayed_ack) {
10548				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10549				    stcb->sctp_ep, stcb, NULL,
10550				    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10551				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10552				    stcb->sctp_ep, stcb, NULL);
10553			} else {
10554				stcb->asoc.send_sack = 1;
10555			}
10556			return;
10557		}
10558		a_chk->copy_by_ref = 0;
10559		a_chk->rec.chunk_id.id = type;
10560		a_chk->rec.chunk_id.can_take_data = 1;
10561	}
10562	/* Clear our pkt counts */
10563	asoc->data_pkts_seen = 0;
10564
10565	a_chk->flags = 0;
10566	a_chk->asoc = asoc;
10567	a_chk->snd_count = 0;
10568	a_chk->send_size = 0;	/* fill in later */
10569	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10570	a_chk->whoTo = NULL;
10571
10572	if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10573		/*-
10574		 * Ok, the destination for the SACK is unreachable, lets see if
10575		 * we can select an alternate to asoc->last_data_chunk_from
10576		 */
10577		a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10578		if (a_chk->whoTo == NULL) {
10579			/* Nope, no alternate */
10580			a_chk->whoTo = asoc->last_data_chunk_from;
10581		}
10582	} else {
10583		a_chk->whoTo = asoc->last_data_chunk_from;
10584	}
10585	if (a_chk->whoTo) {
10586		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10587	}
10588	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10589		highest_tsn = asoc->highest_tsn_inside_map;
10590	} else {
10591		highest_tsn = asoc->highest_tsn_inside_nr_map;
10592	}
10593	if (highest_tsn == asoc->cumulative_tsn) {
10594		/* no gaps */
10595		if (type == SCTP_SELECTIVE_ACK) {
10596			space_req = sizeof(struct sctp_sack_chunk);
10597		} else {
10598			space_req = sizeof(struct sctp_nr_sack_chunk);
10599		}
10600	} else {
10601		/* gaps get a cluster */
10602		space_req = MCLBYTES;
10603	}
10604	/* Ok now lets formulate a MBUF with our sack */
10605	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10606	if ((a_chk->data == NULL) ||
10607	    (a_chk->whoTo == NULL)) {
10608		/* rats, no mbuf memory */
10609		if (a_chk->data) {
10610			/* was a problem with the destination */
10611			sctp_m_freem(a_chk->data);
10612			a_chk->data = NULL;
10613		}
10614		sctp_free_a_chunk(stcb, a_chk, so_locked);
10615		/* sa_ignore NO_NULL_CHK */
10616		if (stcb->asoc.delayed_ack) {
10617			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10618			    stcb->sctp_ep, stcb, NULL,
10619			    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10620			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10621			    stcb->sctp_ep, stcb, NULL);
10622		} else {
10623			stcb->asoc.send_sack = 1;
10624		}
10625		return;
10626	}
10627	/* ok, lets go through and fill it in */
10628	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10629	space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10630	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10631		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10632	}
10633	limit = mtod(a_chk->data, caddr_t);
10634	limit += space;
10635
10636	flags = 0;
10637
10638	if ((asoc->sctp_cmt_on_off > 0) &&
10639	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10640		/*-
10641		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10642		 * received, then set high bit to 1, else 0. Reset
10643		 * pkts_rcvd.
10644		 */
10645		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10646		asoc->cmt_dac_pkts_rcvd = 0;
10647	}
10648#ifdef SCTP_ASOCLOG_OF_TSNS
10649	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10650	stcb->asoc.cumack_log_atsnt++;
10651	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10652		stcb->asoc.cumack_log_atsnt = 0;
10653	}
10654#endif
10655	/* reset the readers interpretation */
10656	stcb->freed_by_sorcv_sincelast = 0;
10657
10658	if (type == SCTP_SELECTIVE_ACK) {
10659		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10660		nr_sack = NULL;
10661		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10662		if (highest_tsn > asoc->mapping_array_base_tsn) {
10663			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10664		} else {
10665			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10666		}
10667	} else {
10668		sack = NULL;
10669		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10670		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10671		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10672			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10673		} else {
10674			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10675		}
10676	}
10677
10678	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10679		offset = 1;
10680	} else {
10681		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10682	}
10683	if (((type == SCTP_SELECTIVE_ACK) &&
10684	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10685	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10686	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10687		/* we have a gap .. maybe */
10688		for (i = 0; i < siz; i++) {
10689			tsn_map = asoc->mapping_array[i];
10690			if (type == SCTP_SELECTIVE_ACK) {
10691				tsn_map |= asoc->nr_mapping_array[i];
10692			}
10693			if (i == 0) {
10694				/*
10695				 * Clear all bits corresponding to TSNs
10696				 * smaller or equal to the cumulative TSN.
10697				 */
10698				tsn_map &= (~0U << (1 - offset));
10699			}
10700			selector = &sack_array[tsn_map];
10701			if (mergeable && selector->right_edge) {
10702				/*
10703				 * Backup, left and right edges were ok to
10704				 * merge.
10705				 */
10706				num_gap_blocks--;
10707				gap_descriptor--;
10708			}
10709			if (selector->num_entries == 0)
10710				mergeable = 0;
10711			else {
10712				for (j = 0; j < selector->num_entries; j++) {
10713					if (mergeable && selector->right_edge) {
10714						/*
10715						 * do a merge by NOT setting
10716						 * the left side
10717						 */
10718						mergeable = 0;
10719					} else {
10720						/*
10721						 * no merge, set the left
10722						 * side
10723						 */
10724						mergeable = 0;
10725						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10726					}
10727					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10728					num_gap_blocks++;
10729					gap_descriptor++;
10730					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10731						/* no more room */
10732						limit_reached = 1;
10733						break;
10734					}
10735				}
10736				if (selector->left_edge) {
10737					mergeable = 1;
10738				}
10739			}
10740			if (limit_reached) {
10741				/* Reached the limit stop */
10742				break;
10743			}
10744			offset += 8;
10745		}
10746	}
10747	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10748	    (limit_reached == 0)) {
10749
10750		mergeable = 0;
10751
10752		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10753			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10754		} else {
10755			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10756		}
10757
10758		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10759			offset = 1;
10760		} else {
10761			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10762		}
10763		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10764			/* we have a gap .. maybe */
10765			for (i = 0; i < siz; i++) {
10766				tsn_map = asoc->nr_mapping_array[i];
10767				if (i == 0) {
10768					/*
10769					 * Clear all bits corresponding to
10770					 * TSNs smaller or equal to the
10771					 * cumulative TSN.
10772					 */
10773					tsn_map &= (~0U << (1 - offset));
10774				}
10775				selector = &sack_array[tsn_map];
10776				if (mergeable && selector->right_edge) {
10777					/*
10778					 * Backup, left and right edges were
10779					 * ok to merge.
10780					 */
10781					num_nr_gap_blocks--;
10782					gap_descriptor--;
10783				}
10784				if (selector->num_entries == 0)
10785					mergeable = 0;
10786				else {
10787					for (j = 0; j < selector->num_entries; j++) {
10788						if (mergeable && selector->right_edge) {
10789							/*
10790							 * do a merge by NOT
10791							 * setting the left
10792							 * side
10793							 */
10794							mergeable = 0;
10795						} else {
10796							/*
10797							 * no merge, set the
10798							 * left side
10799							 */
10800							mergeable = 0;
10801							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10802						}
10803						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10804						num_nr_gap_blocks++;
10805						gap_descriptor++;
10806						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10807							/* no more room */
10808							limit_reached = 1;
10809							break;
10810						}
10811					}
10812					if (selector->left_edge) {
10813						mergeable = 1;
10814					}
10815				}
10816				if (limit_reached) {
10817					/* Reached the limit stop */
10818					break;
10819				}
10820				offset += 8;
10821			}
10822		}
10823	}
10824	/* now we must add any dups we are going to report. */
10825	if ((limit_reached == 0) && (asoc->numduptsns)) {
10826		dup = (uint32_t *)gap_descriptor;
10827		for (i = 0; i < asoc->numduptsns; i++) {
10828			*dup = htonl(asoc->dup_tsns[i]);
10829			dup++;
10830			num_dups++;
10831			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10832				/* no more room */
10833				break;
10834			}
10835		}
10836		asoc->numduptsns = 0;
10837	}
10838	/*
10839	 * now that the chunk is prepared queue it to the control chunk
10840	 * queue.
10841	 */
10842	if (type == SCTP_SELECTIVE_ACK) {
10843		a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10844		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10845		    num_dups * sizeof(int32_t));
10846		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10847		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10848		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10849		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10850		sack->sack.num_dup_tsns = htons(num_dups);
10851		sack->ch.chunk_type = type;
10852		sack->ch.chunk_flags = flags;
10853		sack->ch.chunk_length = htons(a_chk->send_size);
10854	} else {
10855		a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10856		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10857		    num_dups * sizeof(int32_t));
10858		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10859		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10860		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10861		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10862		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10863		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10864		nr_sack->nr_sack.reserved = 0;
10865		nr_sack->ch.chunk_type = type;
10866		nr_sack->ch.chunk_flags = flags;
10867		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10868	}
10869	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10870	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10871	asoc->ctrl_queue_cnt++;
10872	asoc->send_sack = 0;
10873	SCTP_STAT_INCR(sctps_sendsacks);
10874	return;
10875}
10876
10877void
10878sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10879#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10880    SCTP_UNUSED
10881#endif
10882)
10883{
10884	struct mbuf *m_abort, *m, *m_last;
10885	struct mbuf *m_out, *m_end = NULL;
10886	struct sctp_abort_chunk *abort;
10887	struct sctp_auth_chunk *auth = NULL;
10888	struct sctp_nets *net;
10889	uint32_t vtag;
10890	uint32_t auth_offset = 0;
10891	int error;
10892	uint16_t cause_len, chunk_len, padding_len;
10893
10894	SCTP_TCB_LOCK_ASSERT(stcb);
10895	/*-
10896	 * Add an AUTH chunk, if chunk requires it and save the offset into
10897	 * the chain for AUTH
10898	 */
10899	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10900	    stcb->asoc.peer_auth_chunks)) {
10901		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10902		    stcb, SCTP_ABORT_ASSOCIATION);
10903		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10904	} else {
10905		m_out = NULL;
10906	}
10907	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10908	if (m_abort == NULL) {
10909		if (m_out) {
10910			sctp_m_freem(m_out);
10911		}
10912		if (operr) {
10913			sctp_m_freem(operr);
10914		}
10915		return;
10916	}
10917	/* link in any error */
10918	SCTP_BUF_NEXT(m_abort) = operr;
10919	cause_len = 0;
10920	m_last = NULL;
10921	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10922		cause_len += (uint16_t)SCTP_BUF_LEN(m);
10923		if (SCTP_BUF_NEXT(m) == NULL) {
10924			m_last = m;
10925		}
10926	}
10927	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10928	chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10929	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10930	if (m_out == NULL) {
10931		/* NO Auth chunk prepended, so reserve space in front */
10932		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10933		m_out = m_abort;
10934	} else {
10935		/* Put AUTH chunk at the front of the chain */
10936		SCTP_BUF_NEXT(m_end) = m_abort;
10937	}
10938	if (stcb->asoc.alternate) {
10939		net = stcb->asoc.alternate;
10940	} else {
10941		net = stcb->asoc.primary_destination;
10942	}
10943	/* Fill in the ABORT chunk header. */
10944	abort = mtod(m_abort, struct sctp_abort_chunk *);
10945	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10946	if (stcb->asoc.peer_vtag == 0) {
10947		/* This happens iff the assoc is in COOKIE-WAIT state. */
10948		vtag = stcb->asoc.my_vtag;
10949		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10950	} else {
10951		vtag = stcb->asoc.peer_vtag;
10952		abort->ch.chunk_flags = 0;
10953	}
10954	abort->ch.chunk_length = htons(chunk_len);
10955	/* Add padding, if necessary. */
10956	if (padding_len > 0) {
10957		if ((m_last == NULL) ||
10958		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10959			sctp_m_freem(m_out);
10960			return;
10961		}
10962	}
10963	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10964	    (struct sockaddr *)&net->ro._l_addr,
10965	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10966	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10967	    stcb->asoc.primary_destination->port, NULL,
10968	    0, 0,
10969	    so_locked))) {
10970		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10971		if (error == ENOBUFS) {
10972			stcb->asoc.ifp_had_enobuf = 1;
10973			SCTP_STAT_INCR(sctps_lowlevelerr);
10974		}
10975	} else {
10976		stcb->asoc.ifp_had_enobuf = 0;
10977	}
10978	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10979}
10980
10981void
10982sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10983    struct sctp_nets *net,
10984    int reflect_vtag)
10985{
10986	/* formulate and SEND a SHUTDOWN-COMPLETE */
10987	struct mbuf *m_shutdown_comp;
10988	struct sctp_shutdown_complete_chunk *shutdown_complete;
10989	uint32_t vtag;
10990	int error;
10991	uint8_t flags;
10992
10993	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10994	if (m_shutdown_comp == NULL) {
10995		/* no mbuf's */
10996		return;
10997	}
10998	if (reflect_vtag) {
10999		flags = SCTP_HAD_NO_TCB;
11000		vtag = stcb->asoc.my_vtag;
11001	} else {
11002		flags = 0;
11003		vtag = stcb->asoc.peer_vtag;
11004	}
11005	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11006	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11007	shutdown_complete->ch.chunk_flags = flags;
11008	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11009	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11010	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11011	    (struct sockaddr *)&net->ro._l_addr,
11012	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11013	    stcb->sctp_ep->sctp_lport, stcb->rport,
11014	    htonl(vtag),
11015	    net->port, NULL,
11016	    0, 0,
11017	    SCTP_SO_NOT_LOCKED))) {
11018		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11019		if (error == ENOBUFS) {
11020			stcb->asoc.ifp_had_enobuf = 1;
11021			SCTP_STAT_INCR(sctps_lowlevelerr);
11022		}
11023	} else {
11024		stcb->asoc.ifp_had_enobuf = 0;
11025	}
11026	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11027	return;
11028}
11029
11030static void
11031sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11032    struct sctphdr *sh, uint32_t vtag,
11033    uint8_t type, struct mbuf *cause,
11034    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11035    uint32_t vrf_id, uint16_t port)
11036{
11037	struct mbuf *o_pak;
11038	struct mbuf *mout;
11039	struct sctphdr *shout;
11040	struct sctp_chunkhdr *ch;
11041#if defined(INET) || defined(INET6)
11042	struct udphdr *udp;
11043	int ret;
11044#endif
11045	int len, cause_len, padding_len;
11046#ifdef INET
11047	struct sockaddr_in *src_sin, *dst_sin;
11048	struct ip *ip;
11049#endif
11050#ifdef INET6
11051	struct sockaddr_in6 *src_sin6, *dst_sin6;
11052	struct ip6_hdr *ip6;
11053#endif
11054
11055	/* Compute the length of the cause and add final padding. */
11056	cause_len = 0;
11057	if (cause != NULL) {
11058		struct mbuf *m_at, *m_last = NULL;
11059
11060		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11061			if (SCTP_BUF_NEXT(m_at) == NULL)
11062				m_last = m_at;
11063			cause_len += SCTP_BUF_LEN(m_at);
11064		}
11065		padding_len = cause_len % 4;
11066		if (padding_len != 0) {
11067			padding_len = 4 - padding_len;
11068		}
11069		if (padding_len != 0) {
11070			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11071				sctp_m_freem(cause);
11072				return;
11073			}
11074		}
11075	} else {
11076		padding_len = 0;
11077	}
11078	/* Get an mbuf for the header. */
11079	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11080	switch (dst->sa_family) {
11081#ifdef INET
11082	case AF_INET:
11083		len += sizeof(struct ip);
11084		break;
11085#endif
11086#ifdef INET6
11087	case AF_INET6:
11088		len += sizeof(struct ip6_hdr);
11089		break;
11090#endif
11091	default:
11092		break;
11093	}
11094#if defined(INET) || defined(INET6)
11095	if (port) {
11096		len += sizeof(struct udphdr);
11097	}
11098#endif
11099	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11100	if (mout == NULL) {
11101		if (cause) {
11102			sctp_m_freem(cause);
11103		}
11104		return;
11105	}
11106	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11107	SCTP_BUF_LEN(mout) = len;
11108	SCTP_BUF_NEXT(mout) = cause;
11109	M_SETFIB(mout, fibnum);
11110	mout->m_pkthdr.flowid = mflowid;
11111	M_HASHTYPE_SET(mout, mflowtype);
11112#ifdef INET
11113	ip = NULL;
11114#endif
11115#ifdef INET6
11116	ip6 = NULL;
11117#endif
11118	switch (dst->sa_family) {
11119#ifdef INET
11120	case AF_INET:
11121		src_sin = (struct sockaddr_in *)src;
11122		dst_sin = (struct sockaddr_in *)dst;
11123		ip = mtod(mout, struct ip *);
11124		ip->ip_v = IPVERSION;
11125		ip->ip_hl = (sizeof(struct ip) >> 2);
11126		ip->ip_tos = 0;
11127		ip->ip_off = htons(IP_DF);
11128		ip_fillid(ip);
11129		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11130		if (port) {
11131			ip->ip_p = IPPROTO_UDP;
11132		} else {
11133			ip->ip_p = IPPROTO_SCTP;
11134		}
11135		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11136		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11137		ip->ip_sum = 0;
11138		len = sizeof(struct ip);
11139		shout = (struct sctphdr *)((caddr_t)ip + len);
11140		break;
11141#endif
11142#ifdef INET6
11143	case AF_INET6:
11144		src_sin6 = (struct sockaddr_in6 *)src;
11145		dst_sin6 = (struct sockaddr_in6 *)dst;
11146		ip6 = mtod(mout, struct ip6_hdr *);
11147		ip6->ip6_flow = htonl(0x60000000);
11148		if (V_ip6_auto_flowlabel) {
11149			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11150		}
11151		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11152		if (port) {
11153			ip6->ip6_nxt = IPPROTO_UDP;
11154		} else {
11155			ip6->ip6_nxt = IPPROTO_SCTP;
11156		}
11157		ip6->ip6_src = dst_sin6->sin6_addr;
11158		ip6->ip6_dst = src_sin6->sin6_addr;
11159		len = sizeof(struct ip6_hdr);
11160		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11161		break;
11162#endif
11163	default:
11164		len = 0;
11165		shout = mtod(mout, struct sctphdr *);
11166		break;
11167	}
11168#if defined(INET) || defined(INET6)
11169	if (port) {
11170		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11171			sctp_m_freem(mout);
11172			return;
11173		}
11174		udp = (struct udphdr *)shout;
11175		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11176		udp->uh_dport = port;
11177		udp->uh_sum = 0;
11178		udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11179		    sizeof(struct sctphdr) +
11180		    sizeof(struct sctp_chunkhdr) +
11181		    cause_len + padding_len));
11182		len += sizeof(struct udphdr);
11183		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11184	} else {
11185		udp = NULL;
11186	}
11187#endif
11188	shout->src_port = sh->dest_port;
11189	shout->dest_port = sh->src_port;
11190	shout->checksum = 0;
11191	if (vtag) {
11192		shout->v_tag = htonl(vtag);
11193	} else {
11194		shout->v_tag = sh->v_tag;
11195	}
11196	len += sizeof(struct sctphdr);
11197	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11198	ch->chunk_type = type;
11199	if (vtag) {
11200		ch->chunk_flags = 0;
11201	} else {
11202		ch->chunk_flags = SCTP_HAD_NO_TCB;
11203	}
11204	ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11205	len += sizeof(struct sctp_chunkhdr);
11206	len += cause_len + padding_len;
11207
11208	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11209		sctp_m_freem(mout);
11210		return;
11211	}
11212	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11213	switch (dst->sa_family) {
11214#ifdef INET
11215	case AF_INET:
11216		if (port) {
11217			if (V_udp_cksum) {
11218				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11219			} else {
11220				udp->uh_sum = 0;
11221			}
11222		}
11223		ip->ip_len = htons(len);
11224		if (port) {
11225#if defined(SCTP_WITH_NO_CSUM)
11226			SCTP_STAT_INCR(sctps_sendnocrc);
11227#else
11228			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11229			SCTP_STAT_INCR(sctps_sendswcrc);
11230#endif
11231			if (V_udp_cksum) {
11232				SCTP_ENABLE_UDP_CSUM(o_pak);
11233			}
11234		} else {
11235#if defined(SCTP_WITH_NO_CSUM)
11236			SCTP_STAT_INCR(sctps_sendnocrc);
11237#else
11238			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11239			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11240			SCTP_STAT_INCR(sctps_sendhwcrc);
11241#endif
11242		}
11243#ifdef SCTP_PACKET_LOGGING
11244		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11245			sctp_packet_log(o_pak);
11246		}
11247#endif
11248		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11249		break;
11250#endif
11251#ifdef INET6
11252	case AF_INET6:
11253		ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11254		if (port) {
11255#if defined(SCTP_WITH_NO_CSUM)
11256			SCTP_STAT_INCR(sctps_sendnocrc);
11257#else
11258			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11259			SCTP_STAT_INCR(sctps_sendswcrc);
11260#endif
11261			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11262				udp->uh_sum = 0xffff;
11263			}
11264		} else {
11265#if defined(SCTP_WITH_NO_CSUM)
11266			SCTP_STAT_INCR(sctps_sendnocrc);
11267#else
11268			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11269			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11270			SCTP_STAT_INCR(sctps_sendhwcrc);
11271#endif
11272		}
11273#ifdef SCTP_PACKET_LOGGING
11274		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11275			sctp_packet_log(o_pak);
11276		}
11277#endif
11278		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11279		break;
11280#endif
11281	default:
11282		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11283		    dst->sa_family);
11284		sctp_m_freem(mout);
11285		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11286		return;
11287	}
11288	SCTP_STAT_INCR(sctps_sendpackets);
11289	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11290	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11291	return;
11292}
11293
11294void
11295sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11296    struct sctphdr *sh,
11297    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11298    uint32_t vrf_id, uint16_t port)
11299{
11300	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11301	    mflowtype, mflowid, fibnum,
11302	    vrf_id, port);
11303}
11304
11305void
11306sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11307#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11308    SCTP_UNUSED
11309#endif
11310)
11311{
11312	struct sctp_tmit_chunk *chk;
11313	struct sctp_heartbeat_chunk *hb;
11314	struct timeval now;
11315
11316	SCTP_TCB_LOCK_ASSERT(stcb);
11317	if (net == NULL) {
11318		return;
11319	}
11320	(void)SCTP_GETTIME_TIMEVAL(&now);
11321	switch (net->ro._l_addr.sa.sa_family) {
11322#ifdef INET
11323	case AF_INET:
11324		break;
11325#endif
11326#ifdef INET6
11327	case AF_INET6:
11328		break;
11329#endif
11330	default:
11331		return;
11332	}
11333	sctp_alloc_a_chunk(stcb, chk);
11334	if (chk == NULL) {
11335		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11336		return;
11337	}
11338	chk->copy_by_ref = 0;
11339	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11340	chk->rec.chunk_id.can_take_data = 1;
11341	chk->flags = 0;
11342	chk->asoc = &stcb->asoc;
11343	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11344
11345	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11346	if (chk->data == NULL) {
11347		sctp_free_a_chunk(stcb, chk, so_locked);
11348		return;
11349	}
11350	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11351	SCTP_BUF_LEN(chk->data) = chk->send_size;
11352	chk->sent = SCTP_DATAGRAM_UNSENT;
11353	chk->snd_count = 0;
11354	chk->whoTo = net;
11355	atomic_add_int(&chk->whoTo->ref_count, 1);
11356	/* Now we have a mbuf that we can fill in with the details */
11357	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11358	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11359	/* fill out chunk header */
11360	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11361	hb->ch.chunk_flags = 0;
11362	hb->ch.chunk_length = htons(chk->send_size);
11363	/* Fill out hb parameter */
11364	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11365	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11366	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11367	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11368	/* Did our user request this one, put it in */
11369	hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11370	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11371	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11372		/*
11373		 * we only take from the entropy pool if the address is not
11374		 * confirmed.
11375		 */
11376		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11377		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11378	} else {
11379		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11380		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11381	}
11382	switch (net->ro._l_addr.sa.sa_family) {
11383#ifdef INET
11384	case AF_INET:
11385		memcpy(hb->heartbeat.hb_info.address,
11386		    &net->ro._l_addr.sin.sin_addr,
11387		    sizeof(net->ro._l_addr.sin.sin_addr));
11388		break;
11389#endif
11390#ifdef INET6
11391	case AF_INET6:
11392		memcpy(hb->heartbeat.hb_info.address,
11393		    &net->ro._l_addr.sin6.sin6_addr,
11394		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11395		break;
11396#endif
11397	default:
11398		if (chk->data) {
11399			sctp_m_freem(chk->data);
11400			chk->data = NULL;
11401		}
11402		sctp_free_a_chunk(stcb, chk, so_locked);
11403		return;
11404		break;
11405	}
11406	net->hb_responded = 0;
11407	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11408	stcb->asoc.ctrl_queue_cnt++;
11409	SCTP_STAT_INCR(sctps_sendheartbeat);
11410	return;
11411}
11412
11413void
11414sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11415    uint32_t high_tsn)
11416{
11417	struct sctp_association *asoc;
11418	struct sctp_ecne_chunk *ecne;
11419	struct sctp_tmit_chunk *chk;
11420
11421	if (net == NULL) {
11422		return;
11423	}
11424	asoc = &stcb->asoc;
11425	SCTP_TCB_LOCK_ASSERT(stcb);
11426	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11427		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11428			/* found a previous ECN_ECHO update it if needed */
11429			uint32_t cnt, ctsn;
11430
11431			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11432			ctsn = ntohl(ecne->tsn);
11433			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11434				ecne->tsn = htonl(high_tsn);
11435				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11436			}
11437			cnt = ntohl(ecne->num_pkts_since_cwr);
11438			cnt++;
11439			ecne->num_pkts_since_cwr = htonl(cnt);
11440			return;
11441		}
11442	}
11443	/* nope could not find one to update so we must build one */
11444	sctp_alloc_a_chunk(stcb, chk);
11445	if (chk == NULL) {
11446		return;
11447	}
11448	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11449	chk->copy_by_ref = 0;
11450	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11451	chk->rec.chunk_id.can_take_data = 0;
11452	chk->flags = 0;
11453	chk->asoc = &stcb->asoc;
11454	chk->send_size = sizeof(struct sctp_ecne_chunk);
11455	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11456	if (chk->data == NULL) {
11457		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11458		return;
11459	}
11460	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11461	SCTP_BUF_LEN(chk->data) = chk->send_size;
11462	chk->sent = SCTP_DATAGRAM_UNSENT;
11463	chk->snd_count = 0;
11464	chk->whoTo = net;
11465	atomic_add_int(&chk->whoTo->ref_count, 1);
11466
11467	stcb->asoc.ecn_echo_cnt_onq++;
11468	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11469	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11470	ecne->ch.chunk_flags = 0;
11471	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11472	ecne->tsn = htonl(high_tsn);
11473	ecne->num_pkts_since_cwr = htonl(1);
11474	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11475	asoc->ctrl_queue_cnt++;
11476}
11477
11478void
11479sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11480    struct mbuf *m, int len, int iphlen, int bad_crc)
11481{
11482	struct sctp_association *asoc;
11483	struct sctp_pktdrop_chunk *drp;
11484	struct sctp_tmit_chunk *chk;
11485	uint8_t *datap;
11486	int was_trunc = 0;
11487	int fullsz = 0;
11488	long spc;
11489	int offset;
11490	struct sctp_chunkhdr *ch, chunk_buf;
11491	unsigned int chk_length;
11492
11493	if (!stcb) {
11494		return;
11495	}
11496	asoc = &stcb->asoc;
11497	SCTP_TCB_LOCK_ASSERT(stcb);
11498	if (asoc->pktdrop_supported == 0) {
11499		/*-
11500		 * peer must declare support before I send one.
11501		 */
11502		return;
11503	}
11504	if (stcb->sctp_socket == NULL) {
11505		return;
11506	}
11507	sctp_alloc_a_chunk(stcb, chk);
11508	if (chk == NULL) {
11509		return;
11510	}
11511	chk->copy_by_ref = 0;
11512	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11513	chk->rec.chunk_id.can_take_data = 1;
11514	chk->flags = 0;
11515	len -= iphlen;
11516	chk->send_size = len;
11517	/* Validate that we do not have an ABORT in here. */
11518	offset = iphlen + sizeof(struct sctphdr);
11519	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11520	    sizeof(*ch), (uint8_t *)&chunk_buf);
11521	while (ch != NULL) {
11522		chk_length = ntohs(ch->chunk_length);
11523		if (chk_length < sizeof(*ch)) {
11524			/* break to abort land */
11525			break;
11526		}
11527		switch (ch->chunk_type) {
11528		case SCTP_PACKET_DROPPED:
11529		case SCTP_ABORT_ASSOCIATION:
11530		case SCTP_INITIATION_ACK:
11531			/**
11532			 * We don't respond with an PKT-DROP to an ABORT
11533			 * or PKT-DROP. We also do not respond to an
11534			 * INIT-ACK, because we can't know if the initiation
11535			 * tag is correct or not.
11536			 */
11537			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11538			return;
11539		default:
11540			break;
11541		}
11542		offset += SCTP_SIZE32(chk_length);
11543		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11544		    sizeof(*ch), (uint8_t *)&chunk_buf);
11545	}
11546
11547	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11548	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11549		/*
11550		 * only send 1 mtu worth, trim off the excess on the end.
11551		 */
11552		fullsz = len;
11553		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11554		was_trunc = 1;
11555	}
11556	chk->asoc = &stcb->asoc;
11557	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11558	if (chk->data == NULL) {
11559jump_out:
11560		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11561		return;
11562	}
11563	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11564	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11565	if (drp == NULL) {
11566		sctp_m_freem(chk->data);
11567		chk->data = NULL;
11568		goto jump_out;
11569	}
11570	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11571	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11572	chk->book_size_scale = 0;
11573	if (was_trunc) {
11574		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11575		drp->trunc_len = htons(fullsz);
11576		/*
11577		 * Len is already adjusted to size minus overhead above take
11578		 * out the pkt_drop chunk itself from it.
11579		 */
11580		chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11581		len = chk->send_size;
11582	} else {
11583		/* no truncation needed */
11584		drp->ch.chunk_flags = 0;
11585		drp->trunc_len = htons(0);
11586	}
11587	if (bad_crc) {
11588		drp->ch.chunk_flags |= SCTP_BADCRC;
11589	}
11590	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11591	SCTP_BUF_LEN(chk->data) = chk->send_size;
11592	chk->sent = SCTP_DATAGRAM_UNSENT;
11593	chk->snd_count = 0;
11594	if (net) {
11595		/* we should hit here */
11596		chk->whoTo = net;
11597		atomic_add_int(&chk->whoTo->ref_count, 1);
11598	} else {
11599		chk->whoTo = NULL;
11600	}
11601	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11602	drp->ch.chunk_length = htons(chk->send_size);
11603	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11604	if (spc < 0) {
11605		spc = 0;
11606	}
11607	drp->bottle_bw = htonl(spc);
11608	if (asoc->my_rwnd) {
11609		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11610		    asoc->size_on_all_streams +
11611		    asoc->my_rwnd_control_len +
11612		    stcb->sctp_socket->so_rcv.sb_cc);
11613	} else {
11614		/*-
11615		 * If my rwnd is 0, possibly from mbuf depletion as well as
11616		 * space used, tell the peer there is NO space aka onq == bw
11617		 */
11618		drp->current_onq = htonl(spc);
11619	}
11620	drp->reserved = 0;
11621	datap = drp->data;
11622	m_copydata(m, iphlen, len, (caddr_t)datap);
11623	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11624	asoc->ctrl_queue_cnt++;
11625}
11626
11627void
11628sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11629{
11630	struct sctp_association *asoc;
11631	struct sctp_cwr_chunk *cwr;
11632	struct sctp_tmit_chunk *chk;
11633
11634	SCTP_TCB_LOCK_ASSERT(stcb);
11635	if (net == NULL) {
11636		return;
11637	}
11638	asoc = &stcb->asoc;
11639	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11640		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11641			/*
11642			 * found a previous CWR queued to same destination
11643			 * update it if needed
11644			 */
11645			uint32_t ctsn;
11646
11647			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11648			ctsn = ntohl(cwr->tsn);
11649			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11650				cwr->tsn = htonl(high_tsn);
11651			}
11652			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11653				/* Make sure override is carried */
11654				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11655			}
11656			return;
11657		}
11658	}
11659	sctp_alloc_a_chunk(stcb, chk);
11660	if (chk == NULL) {
11661		return;
11662	}
11663	chk->copy_by_ref = 0;
11664	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11665	chk->rec.chunk_id.can_take_data = 1;
11666	chk->flags = 0;
11667	chk->asoc = &stcb->asoc;
11668	chk->send_size = sizeof(struct sctp_cwr_chunk);
11669	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11670	if (chk->data == NULL) {
11671		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11672		return;
11673	}
11674	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11675	SCTP_BUF_LEN(chk->data) = chk->send_size;
11676	chk->sent = SCTP_DATAGRAM_UNSENT;
11677	chk->snd_count = 0;
11678	chk->whoTo = net;
11679	atomic_add_int(&chk->whoTo->ref_count, 1);
11680	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11681	cwr->ch.chunk_type = SCTP_ECN_CWR;
11682	cwr->ch.chunk_flags = override;
11683	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11684	cwr->tsn = htonl(high_tsn);
11685	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11686	asoc->ctrl_queue_cnt++;
11687}
11688
11689static int
11690sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11691    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11692{
11693	uint16_t len, old_len, i;
11694	struct sctp_stream_reset_out_request *req_out;
11695	struct sctp_chunkhdr *ch;
11696	int at;
11697	int number_entries = 0;
11698
11699	ch = mtod(chk->data, struct sctp_chunkhdr *);
11700	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11701	/* get to new offset for the param. */
11702	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11703	/* now how long will this param be? */
11704	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11705		if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11706		    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11707		    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11708			number_entries++;
11709		}
11710	}
11711	if (number_entries == 0) {
11712		return (0);
11713	}
11714	if (number_entries == stcb->asoc.streamoutcnt) {
11715		number_entries = 0;
11716	}
11717	if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11718		number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11719	}
11720	len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11721	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11722	req_out->ph.param_length = htons(len);
11723	req_out->request_seq = htonl(seq);
11724	req_out->response_seq = htonl(resp_seq);
11725	req_out->send_reset_at_tsn = htonl(last_sent);
11726	at = 0;
11727	if (number_entries) {
11728		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11729			if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11730			    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11731			    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11732				req_out->list_of_streams[at] = htons(i);
11733				at++;
11734				stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11735				if (at >= number_entries) {
11736					break;
11737				}
11738			}
11739		}
11740	} else {
11741		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11742			stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11743		}
11744	}
11745	if (SCTP_SIZE32(len) > len) {
11746		/*-
11747		 * Need to worry about the pad we may end up adding to the
11748		 * end. This is easy since the struct is either aligned to 4
11749		 * bytes or 2 bytes off.
11750		 */
11751		req_out->list_of_streams[number_entries] = 0;
11752	}
11753	/* now fix the chunk length */
11754	ch->chunk_length = htons(len + old_len);
11755	chk->book_size = len + old_len;
11756	chk->book_size_scale = 0;
11757	chk->send_size = SCTP_SIZE32(chk->book_size);
11758	SCTP_BUF_LEN(chk->data) = chk->send_size;
11759	return (1);
11760}
11761
11762static void
11763sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11764    int number_entries, uint16_t *list,
11765    uint32_t seq)
11766{
11767	uint16_t len, old_len, i;
11768	struct sctp_stream_reset_in_request *req_in;
11769	struct sctp_chunkhdr *ch;
11770
11771	ch = mtod(chk->data, struct sctp_chunkhdr *);
11772	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11773
11774	/* get to new offset for the param. */
11775	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11776	/* now how long will this param be? */
11777	len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11778	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11779	req_in->ph.param_length = htons(len);
11780	req_in->request_seq = htonl(seq);
11781	if (number_entries) {
11782		for (i = 0; i < number_entries; i++) {
11783			req_in->list_of_streams[i] = htons(list[i]);
11784		}
11785	}
11786	if (SCTP_SIZE32(len) > len) {
11787		/*-
11788		 * Need to worry about the pad we may end up adding to the
11789		 * end. This is easy since the struct is either aligned to 4
11790		 * bytes or 2 bytes off.
11791		 */
11792		req_in->list_of_streams[number_entries] = 0;
11793	}
11794	/* now fix the chunk length */
11795	ch->chunk_length = htons(len + old_len);
11796	chk->book_size = len + old_len;
11797	chk->book_size_scale = 0;
11798	chk->send_size = SCTP_SIZE32(chk->book_size);
11799	SCTP_BUF_LEN(chk->data) = chk->send_size;
11800	return;
11801}
11802
11803static void
11804sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11805    uint32_t seq)
11806{
11807	uint16_t len, old_len;
11808	struct sctp_stream_reset_tsn_request *req_tsn;
11809	struct sctp_chunkhdr *ch;
11810
11811	ch = mtod(chk->data, struct sctp_chunkhdr *);
11812	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11813
11814	/* get to new offset for the param. */
11815	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11816	/* now how long will this param be? */
11817	len = sizeof(struct sctp_stream_reset_tsn_request);
11818	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11819	req_tsn->ph.param_length = htons(len);
11820	req_tsn->request_seq = htonl(seq);
11821
11822	/* now fix the chunk length */
11823	ch->chunk_length = htons(len + old_len);
11824	chk->send_size = len + old_len;
11825	chk->book_size = SCTP_SIZE32(chk->send_size);
11826	chk->book_size_scale = 0;
11827	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11828	return;
11829}
11830
11831void
11832sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11833    uint32_t resp_seq, uint32_t result)
11834{
11835	uint16_t len, old_len;
11836	struct sctp_stream_reset_response *resp;
11837	struct sctp_chunkhdr *ch;
11838
11839	ch = mtod(chk->data, struct sctp_chunkhdr *);
11840	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11841
11842	/* get to new offset for the param. */
11843	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11844	/* now how long will this param be? */
11845	len = sizeof(struct sctp_stream_reset_response);
11846	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11847	resp->ph.param_length = htons(len);
11848	resp->response_seq = htonl(resp_seq);
11849	resp->result = ntohl(result);
11850
11851	/* now fix the chunk length */
11852	ch->chunk_length = htons(len + old_len);
11853	chk->book_size = len + old_len;
11854	chk->book_size_scale = 0;
11855	chk->send_size = SCTP_SIZE32(chk->book_size);
11856	SCTP_BUF_LEN(chk->data) = chk->send_size;
11857	return;
11858}
11859
11860void
11861sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11862    struct sctp_stream_reset_list *ent,
11863    int response)
11864{
11865	struct sctp_association *asoc;
11866	struct sctp_tmit_chunk *chk;
11867	struct sctp_chunkhdr *ch;
11868
11869	asoc = &stcb->asoc;
11870
11871	/*
11872	 * Reset our last reset action to the new one IP -> response
11873	 * (PERFORMED probably). This assures that if we fail to send, a
11874	 * retran from the peer will get the new response.
11875	 */
11876	asoc->last_reset_action[0] = response;
11877	if (asoc->stream_reset_outstanding) {
11878		return;
11879	}
11880	sctp_alloc_a_chunk(stcb, chk);
11881	if (chk == NULL) {
11882		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11883		return;
11884	}
11885	chk->copy_by_ref = 0;
11886	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11887	chk->rec.chunk_id.can_take_data = 0;
11888	chk->flags = 0;
11889	chk->asoc = &stcb->asoc;
11890	chk->book_size = sizeof(struct sctp_chunkhdr);
11891	chk->send_size = SCTP_SIZE32(chk->book_size);
11892	chk->book_size_scale = 0;
11893	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11894	if (chk->data == NULL) {
11895		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11896		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11897		return;
11898	}
11899	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11900	/* setup chunk parameters */
11901	chk->sent = SCTP_DATAGRAM_UNSENT;
11902	chk->snd_count = 0;
11903	if (stcb->asoc.alternate) {
11904		chk->whoTo = stcb->asoc.alternate;
11905	} else {
11906		chk->whoTo = stcb->asoc.primary_destination;
11907	}
11908	ch = mtod(chk->data, struct sctp_chunkhdr *);
11909	ch->chunk_type = SCTP_STREAM_RESET;
11910	ch->chunk_flags = 0;
11911	ch->chunk_length = htons(chk->book_size);
11912	atomic_add_int(&chk->whoTo->ref_count, 1);
11913	SCTP_BUF_LEN(chk->data) = chk->send_size;
11914	sctp_add_stream_reset_result(chk, ent->seq, response);
11915	/* insert the chunk for sending */
11916	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11917	    chk,
11918	    sctp_next);
11919	asoc->ctrl_queue_cnt++;
11920}
11921
11922void
11923sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11924    uint32_t resp_seq, uint32_t result,
11925    uint32_t send_una, uint32_t recv_next)
11926{
11927	uint16_t len, old_len;
11928	struct sctp_stream_reset_response_tsn *resp;
11929	struct sctp_chunkhdr *ch;
11930
11931	ch = mtod(chk->data, struct sctp_chunkhdr *);
11932	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11933
11934	/* get to new offset for the param. */
11935	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11936	/* now how long will this param be? */
11937	len = sizeof(struct sctp_stream_reset_response_tsn);
11938	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11939	resp->ph.param_length = htons(len);
11940	resp->response_seq = htonl(resp_seq);
11941	resp->result = htonl(result);
11942	resp->senders_next_tsn = htonl(send_una);
11943	resp->receivers_next_tsn = htonl(recv_next);
11944
11945	/* now fix the chunk length */
11946	ch->chunk_length = htons(len + old_len);
11947	chk->book_size = len + old_len;
11948	chk->send_size = SCTP_SIZE32(chk->book_size);
11949	chk->book_size_scale = 0;
11950	SCTP_BUF_LEN(chk->data) = chk->send_size;
11951	return;
11952}
11953
11954static void
11955sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11956    uint32_t seq,
11957    uint16_t adding)
11958{
11959	uint16_t len, old_len;
11960	struct sctp_chunkhdr *ch;
11961	struct sctp_stream_reset_add_strm *addstr;
11962
11963	ch = mtod(chk->data, struct sctp_chunkhdr *);
11964	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11965
11966	/* get to new offset for the param. */
11967	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11968	/* now how long will this param be? */
11969	len = sizeof(struct sctp_stream_reset_add_strm);
11970
11971	/* Fill it out. */
11972	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11973	addstr->ph.param_length = htons(len);
11974	addstr->request_seq = htonl(seq);
11975	addstr->number_of_streams = htons(adding);
11976	addstr->reserved = 0;
11977
11978	/* now fix the chunk length */
11979	ch->chunk_length = htons(len + old_len);
11980	chk->send_size = len + old_len;
11981	chk->book_size = SCTP_SIZE32(chk->send_size);
11982	chk->book_size_scale = 0;
11983	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11984	return;
11985}
11986
11987static void
11988sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11989    uint32_t seq,
11990    uint16_t adding)
11991{
11992	uint16_t len, old_len;
11993	struct sctp_chunkhdr *ch;
11994	struct sctp_stream_reset_add_strm *addstr;
11995
11996	ch = mtod(chk->data, struct sctp_chunkhdr *);
11997	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11998
11999	/* get to new offset for the param. */
12000	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12001	/* now how long will this param be? */
12002	len = sizeof(struct sctp_stream_reset_add_strm);
12003	/* Fill it out. */
12004	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12005	addstr->ph.param_length = htons(len);
12006	addstr->request_seq = htonl(seq);
12007	addstr->number_of_streams = htons(adding);
12008	addstr->reserved = 0;
12009
12010	/* now fix the chunk length */
12011	ch->chunk_length = htons(len + old_len);
12012	chk->send_size = len + old_len;
12013	chk->book_size = SCTP_SIZE32(chk->send_size);
12014	chk->book_size_scale = 0;
12015	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12016	return;
12017}
12018
12019int
12020sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12021{
12022	struct sctp_association *asoc;
12023	struct sctp_tmit_chunk *chk;
12024	struct sctp_chunkhdr *ch;
12025	uint32_t seq;
12026
12027	asoc = &stcb->asoc;
12028	asoc->trigger_reset = 0;
12029	if (asoc->stream_reset_outstanding) {
12030		return (EALREADY);
12031	}
12032	sctp_alloc_a_chunk(stcb, chk);
12033	if (chk == NULL) {
12034		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12035		return (ENOMEM);
12036	}
12037	chk->copy_by_ref = 0;
12038	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12039	chk->rec.chunk_id.can_take_data = 0;
12040	chk->flags = 0;
12041	chk->asoc = &stcb->asoc;
12042	chk->book_size = sizeof(struct sctp_chunkhdr);
12043	chk->send_size = SCTP_SIZE32(chk->book_size);
12044	chk->book_size_scale = 0;
12045	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12046	if (chk->data == NULL) {
12047		sctp_free_a_chunk(stcb, chk, so_locked);
12048		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12049		return (ENOMEM);
12050	}
12051	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12052
12053	/* setup chunk parameters */
12054	chk->sent = SCTP_DATAGRAM_UNSENT;
12055	chk->snd_count = 0;
12056	if (stcb->asoc.alternate) {
12057		chk->whoTo = stcb->asoc.alternate;
12058	} else {
12059		chk->whoTo = stcb->asoc.primary_destination;
12060	}
12061	ch = mtod(chk->data, struct sctp_chunkhdr *);
12062	ch->chunk_type = SCTP_STREAM_RESET;
12063	ch->chunk_flags = 0;
12064	ch->chunk_length = htons(chk->book_size);
12065	atomic_add_int(&chk->whoTo->ref_count, 1);
12066	SCTP_BUF_LEN(chk->data) = chk->send_size;
12067	seq = stcb->asoc.str_reset_seq_out;
12068	if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12069		seq++;
12070		asoc->stream_reset_outstanding++;
12071	} else {
12072		m_freem(chk->data);
12073		chk->data = NULL;
12074		sctp_free_a_chunk(stcb, chk, so_locked);
12075		return (ENOENT);
12076	}
12077	asoc->str_reset = chk;
12078	/* insert the chunk for sending */
12079	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12080	    chk,
12081	    sctp_next);
12082	asoc->ctrl_queue_cnt++;
12083
12084	if (stcb->asoc.send_sack) {
12085		sctp_send_sack(stcb, so_locked);
12086	}
12087	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12088	return (0);
12089}
12090
12091int
12092sctp_send_str_reset_req(struct sctp_tcb *stcb,
12093    uint16_t number_entries, uint16_t *list,
12094    uint8_t send_in_req,
12095    uint8_t send_tsn_req,
12096    uint8_t add_stream,
12097    uint16_t adding_o,
12098    uint16_t adding_i, uint8_t peer_asked)
12099{
12100	struct sctp_association *asoc;
12101	struct sctp_tmit_chunk *chk;
12102	struct sctp_chunkhdr *ch;
12103	int can_send_out_req = 0;
12104	uint32_t seq;
12105
12106	asoc = &stcb->asoc;
12107	if (asoc->stream_reset_outstanding) {
12108		/*-
12109		 * Already one pending, must get ACK back to clear the flag.
12110		 */
12111		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12112		return (EBUSY);
12113	}
12114	if ((send_in_req == 0) && (send_tsn_req == 0) &&
12115	    (add_stream == 0)) {
12116		/* nothing to do */
12117		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12118		return (EINVAL);
12119	}
12120	if (send_tsn_req && send_in_req) {
12121		/* error, can't do that */
12122		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12123		return (EINVAL);
12124	} else if (send_in_req) {
12125		can_send_out_req = 1;
12126	}
12127	if (number_entries > (MCLBYTES -
12128	    SCTP_MIN_OVERHEAD -
12129	    sizeof(struct sctp_chunkhdr) -
12130	    sizeof(struct sctp_stream_reset_out_request)) /
12131	    sizeof(uint16_t)) {
12132		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12133		return (ENOMEM);
12134	}
12135	sctp_alloc_a_chunk(stcb, chk);
12136	if (chk == NULL) {
12137		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12138		return (ENOMEM);
12139	}
12140	chk->copy_by_ref = 0;
12141	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12142	chk->rec.chunk_id.can_take_data = 0;
12143	chk->flags = 0;
12144	chk->asoc = &stcb->asoc;
12145	chk->book_size = sizeof(struct sctp_chunkhdr);
12146	chk->send_size = SCTP_SIZE32(chk->book_size);
12147	chk->book_size_scale = 0;
12148
12149	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12150	if (chk->data == NULL) {
12151		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12152		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12153		return (ENOMEM);
12154	}
12155	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12156
12157	/* setup chunk parameters */
12158	chk->sent = SCTP_DATAGRAM_UNSENT;
12159	chk->snd_count = 0;
12160	if (stcb->asoc.alternate) {
12161		chk->whoTo = stcb->asoc.alternate;
12162	} else {
12163		chk->whoTo = stcb->asoc.primary_destination;
12164	}
12165	atomic_add_int(&chk->whoTo->ref_count, 1);
12166	ch = mtod(chk->data, struct sctp_chunkhdr *);
12167	ch->chunk_type = SCTP_STREAM_RESET;
12168	ch->chunk_flags = 0;
12169	ch->chunk_length = htons(chk->book_size);
12170	SCTP_BUF_LEN(chk->data) = chk->send_size;
12171
12172	seq = stcb->asoc.str_reset_seq_out;
12173	if (can_send_out_req) {
12174		int ret;
12175
12176		ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12177		if (ret) {
12178			seq++;
12179			asoc->stream_reset_outstanding++;
12180		}
12181	}
12182	if ((add_stream & 1) &&
12183	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12184		/* Need to allocate more */
12185		struct sctp_stream_out *oldstream;
12186		struct sctp_stream_queue_pending *sp, *nsp;
12187		int i;
12188#if defined(SCTP_DETAILED_STR_STATS)
12189		int j;
12190#endif
12191
12192		oldstream = stcb->asoc.strmout;
12193		/* get some more */
12194		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12195		    (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12196		    SCTP_M_STRMO);
12197		if (stcb->asoc.strmout == NULL) {
12198			uint8_t x;
12199
12200			stcb->asoc.strmout = oldstream;
12201			/* Turn off the bit */
12202			x = add_stream & 0xfe;
12203			add_stream = x;
12204			goto skip_stuff;
12205		}
12206		/*
12207		 * Ok now we proceed with copying the old out stuff and
12208		 * initializing the new stuff.
12209		 */
12210		SCTP_TCB_SEND_LOCK(stcb);
12211		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12212		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12213			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12214			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12215			stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12216			stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12217			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12218			stcb->asoc.strmout[i].sid = i;
12219			stcb->asoc.strmout[i].state = oldstream[i].state;
12220			/* FIX ME FIX ME */
12221			/*
12222			 * This should be a SS_COPY operation FIX ME STREAM
12223			 * SCHEDULER EXPERT
12224			 */
12225			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12226			/* now anything on those queues? */
12227			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12228				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12229				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12230			}
12231
12232		}
12233		/* now the new streams */
12234		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12235		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12236			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12237			stcb->asoc.strmout[i].chunks_on_queues = 0;
12238#if defined(SCTP_DETAILED_STR_STATS)
12239			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12240				stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12241				stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12242			}
12243#else
12244			stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12245			stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12246#endif
12247			stcb->asoc.strmout[i].next_mid_ordered = 0;
12248			stcb->asoc.strmout[i].next_mid_unordered = 0;
12249			stcb->asoc.strmout[i].sid = i;
12250			stcb->asoc.strmout[i].last_msg_incomplete = 0;
12251			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12252			stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12253		}
12254		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12255		SCTP_FREE(oldstream, SCTP_M_STRMO);
12256		SCTP_TCB_SEND_UNLOCK(stcb);
12257	}
12258skip_stuff:
12259	if ((add_stream & 1) && (adding_o > 0)) {
12260		asoc->strm_pending_add_size = adding_o;
12261		asoc->peer_req_out = peer_asked;
12262		sctp_add_an_out_stream(chk, seq, adding_o);
12263		seq++;
12264		asoc->stream_reset_outstanding++;
12265	}
12266	if ((add_stream & 2) && (adding_i > 0)) {
12267		sctp_add_an_in_stream(chk, seq, adding_i);
12268		seq++;
12269		asoc->stream_reset_outstanding++;
12270	}
12271	if (send_in_req) {
12272		sctp_add_stream_reset_in(chk, number_entries, list, seq);
12273		seq++;
12274		asoc->stream_reset_outstanding++;
12275	}
12276	if (send_tsn_req) {
12277		sctp_add_stream_reset_tsn(chk, seq);
12278		asoc->stream_reset_outstanding++;
12279	}
12280	asoc->str_reset = chk;
12281	/* insert the chunk for sending */
12282	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12283	    chk,
12284	    sctp_next);
12285	asoc->ctrl_queue_cnt++;
12286	if (stcb->asoc.send_sack) {
12287		sctp_send_sack(stcb, SCTP_SO_LOCKED);
12288	}
12289	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12290	return (0);
12291}
12292
12293void
12294sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12295    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12296    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12297    uint32_t vrf_id, uint16_t port)
12298{
12299	/* Don't respond to an ABORT with an ABORT. */
12300	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12301		if (cause)
12302			sctp_m_freem(cause);
12303		return;
12304	}
12305	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12306	    mflowtype, mflowid, fibnum,
12307	    vrf_id, port);
12308	return;
12309}
12310
12311void
12312sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12313    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12314    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12315    uint32_t vrf_id, uint16_t port)
12316{
12317	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12318	    mflowtype, mflowid, fibnum,
12319	    vrf_id, port);
12320	return;
12321}
12322
12323static struct mbuf *
12324sctp_copy_resume(struct uio *uio,
12325    int max_send_len,
12326    int user_marks_eor,
12327    int *error,
12328    uint32_t *sndout,
12329    struct mbuf **new_tail)
12330{
12331	struct mbuf *m;
12332
12333	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12334	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12335	if (m == NULL) {
12336		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12337		*error = ENOBUFS;
12338	} else {
12339		*sndout = m_length(m, NULL);
12340		*new_tail = m_last(m);
12341	}
12342	return (m);
12343}
12344
12345static int
12346sctp_copy_one(struct sctp_stream_queue_pending *sp,
12347    struct uio *uio,
12348    int resv_upfront)
12349{
12350	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12351	    resv_upfront, 0);
12352	if (sp->data == NULL) {
12353		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12354		return (ENOBUFS);
12355	}
12356	sp->tail_mbuf = m_last(sp->data);
12357	return (0);
12358}
12359
12360
12361
12362static struct sctp_stream_queue_pending *
12363sctp_copy_it_in(struct sctp_tcb *stcb,
12364    struct sctp_association *asoc,
12365    struct sctp_sndrcvinfo *srcv,
12366    struct uio *uio,
12367    struct sctp_nets *net,
12368    int max_send_len,
12369    int user_marks_eor,
12370    int *error)
12371{
12372	/*-
12373	 * This routine must be very careful in its work. Protocol
12374	 * processing is up and running so care must be taken to spl...()
12375	 * when you need to do something that may effect the stcb/asoc. The
12376	 * sb is locked however. When data is copied the protocol processing
12377	 * should be enabled since this is a slower operation...
12378	 */
12379	struct sctp_stream_queue_pending *sp = NULL;
12380	int resv_in_first;
12381
12382	*error = 0;
12383	/* Now can we send this? */
12384	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12385	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12386	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12387	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12388		/* got data while shutting down */
12389		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12390		*error = ECONNRESET;
12391		goto out_now;
12392	}
12393	sctp_alloc_a_strmoq(stcb, sp);
12394	if (sp == NULL) {
12395		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12396		*error = ENOMEM;
12397		goto out_now;
12398	}
12399	sp->act_flags = 0;
12400	sp->sender_all_done = 0;
12401	sp->sinfo_flags = srcv->sinfo_flags;
12402	sp->timetolive = srcv->sinfo_timetolive;
12403	sp->ppid = srcv->sinfo_ppid;
12404	sp->context = srcv->sinfo_context;
12405	sp->fsn = 0;
12406	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12407
12408	sp->sid = srcv->sinfo_stream;
12409	sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12410	if ((sp->length == (uint32_t)uio->uio_resid) &&
12411	    ((user_marks_eor == 0) ||
12412	    (srcv->sinfo_flags & SCTP_EOF) ||
12413	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12414		sp->msg_is_complete = 1;
12415	} else {
12416		sp->msg_is_complete = 0;
12417	}
12418	sp->sender_all_done = 0;
12419	sp->some_taken = 0;
12420	sp->put_last_out = 0;
12421	resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12422	sp->data = sp->tail_mbuf = NULL;
12423	if (sp->length == 0) {
12424		*error = 0;
12425		goto skip_copy;
12426	}
12427	if (srcv->sinfo_keynumber_valid) {
12428		sp->auth_keyid = srcv->sinfo_keynumber;
12429	} else {
12430		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12431	}
12432	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12433		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12434		sp->holds_key_ref = 1;
12435	}
12436	*error = sctp_copy_one(sp, uio, resv_in_first);
12437skip_copy:
12438	if (*error) {
12439		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12440		sp = NULL;
12441	} else {
12442		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12443			sp->net = net;
12444			atomic_add_int(&sp->net->ref_count, 1);
12445		} else {
12446			sp->net = NULL;
12447		}
12448		sctp_set_prsctp_policy(sp);
12449	}
12450out_now:
12451	return (sp);
12452}
12453
12454
12455int
12456sctp_sosend(struct socket *so,
12457    struct sockaddr *addr,
12458    struct uio *uio,
12459    struct mbuf *top,
12460    struct mbuf *control,
12461    int flags,
12462    struct thread *p
12463)
12464{
12465	int error, use_sndinfo = 0;
12466	struct sctp_sndrcvinfo sndrcvninfo;
12467	struct sockaddr *addr_to_use;
12468#if defined(INET) && defined(INET6)
12469	struct sockaddr_in sin;
12470#endif
12471
12472	if (control) {
12473		/* process cmsg snd/rcv info (maybe a assoc-id) */
12474		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12475		    sizeof(sndrcvninfo))) {
12476			/* got one */
12477			use_sndinfo = 1;
12478		}
12479	}
12480	addr_to_use = addr;
12481#if defined(INET) && defined(INET6)
12482	if ((addr) && (addr->sa_family == AF_INET6)) {
12483		struct sockaddr_in6 *sin6;
12484
12485		sin6 = (struct sockaddr_in6 *)addr;
12486		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12487			in6_sin6_2_sin(&sin, sin6);
12488			addr_to_use = (struct sockaddr *)&sin;
12489		}
12490	}
12491#endif
12492	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12493	    control,
12494	    flags,
12495	    use_sndinfo ? &sndrcvninfo : NULL
12496	    ,p
12497	    );
12498	return (error);
12499}
12500
12501
12502int
12503sctp_lower_sosend(struct socket *so,
12504    struct sockaddr *addr,
12505    struct uio *uio,
12506    struct mbuf *i_pak,
12507    struct mbuf *control,
12508    int flags,
12509    struct sctp_sndrcvinfo *srcv
12510    ,
12511    struct thread *p
12512)
12513{
12514	unsigned int sndlen = 0, max_len;
12515	int error, len;
12516	struct mbuf *top = NULL;
12517	int queue_only = 0, queue_only_for_init = 0;
12518	int free_cnt_applied = 0;
12519	int un_sent;
12520	int now_filled = 0;
12521	unsigned int inqueue_bytes = 0;
12522	struct sctp_block_entry be;
12523	struct sctp_inpcb *inp;
12524	struct sctp_tcb *stcb = NULL;
12525	struct timeval now;
12526	struct sctp_nets *net;
12527	struct sctp_association *asoc;
12528	struct sctp_inpcb *t_inp;
12529	int user_marks_eor;
12530	int create_lock_applied = 0;
12531	int nagle_applies = 0;
12532	int some_on_control = 0;
12533	int got_all_of_the_send = 0;
12534	int hold_tcblock = 0;
12535	int non_blocking = 0;
12536	uint32_t local_add_more, local_soresv = 0;
12537	uint16_t port;
12538	uint16_t sinfo_flags;
12539	sctp_assoc_t sinfo_assoc_id;
12540
12541	error = 0;
12542	net = NULL;
12543	stcb = NULL;
12544	asoc = NULL;
12545
12546	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12547	if (inp == NULL) {
12548		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12549		error = EINVAL;
12550		if (i_pak) {
12551			SCTP_RELEASE_PKT(i_pak);
12552		}
12553		return (error);
12554	}
12555	if ((uio == NULL) && (i_pak == NULL)) {
12556		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12557		return (EINVAL);
12558	}
12559	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12560	atomic_add_int(&inp->total_sends, 1);
12561	if (uio) {
12562		if (uio->uio_resid < 0) {
12563			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12564			return (EINVAL);
12565		}
12566		sndlen = (unsigned int)uio->uio_resid;
12567	} else {
12568		top = SCTP_HEADER_TO_CHAIN(i_pak);
12569		sndlen = SCTP_HEADER_LEN(i_pak);
12570	}
12571	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12572	    (void *)addr,
12573	    sndlen);
12574	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12575	    (inp->sctp_socket->so_qlimit)) {
12576		/* The listener can NOT send */
12577		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12578		error = ENOTCONN;
12579		goto out_unlocked;
12580	}
12581	/**
12582	 * Pre-screen address, if one is given the sin-len
12583	 * must be set correctly!
12584	 */
12585	if (addr) {
12586		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12587
12588		switch (raddr->sa.sa_family) {
12589#ifdef INET
12590		case AF_INET:
12591			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12592				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12593				error = EINVAL;
12594				goto out_unlocked;
12595			}
12596			port = raddr->sin.sin_port;
12597			break;
12598#endif
12599#ifdef INET6
12600		case AF_INET6:
12601			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12602				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12603				error = EINVAL;
12604				goto out_unlocked;
12605			}
12606			port = raddr->sin6.sin6_port;
12607			break;
12608#endif
12609		default:
12610			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12611			error = EAFNOSUPPORT;
12612			goto out_unlocked;
12613		}
12614	} else
12615		port = 0;
12616
12617	if (srcv) {
12618		sinfo_flags = srcv->sinfo_flags;
12619		sinfo_assoc_id = srcv->sinfo_assoc_id;
12620		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12621		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12622			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12623			error = EINVAL;
12624			goto out_unlocked;
12625		}
12626		if (srcv->sinfo_flags)
12627			SCTP_STAT_INCR(sctps_sends_with_flags);
12628	} else {
12629		sinfo_flags = inp->def_send.sinfo_flags;
12630		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12631	}
12632	if (sinfo_flags & SCTP_SENDALL) {
12633		/* its a sendall */
12634		error = sctp_sendall(inp, uio, top, srcv);
12635		top = NULL;
12636		goto out_unlocked;
12637	}
12638	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12639		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12640		error = EINVAL;
12641		goto out_unlocked;
12642	}
12643	/* now we must find the assoc */
12644	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12645	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12646		SCTP_INP_RLOCK(inp);
12647		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12648		if (stcb) {
12649			SCTP_TCB_LOCK(stcb);
12650			hold_tcblock = 1;
12651		}
12652		SCTP_INP_RUNLOCK(inp);
12653	} else if (sinfo_assoc_id) {
12654		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12655		if (stcb != NULL) {
12656			hold_tcblock = 1;
12657		}
12658	} else if (addr) {
12659		/*-
12660		 * Since we did not use findep we must
12661		 * increment it, and if we don't find a tcb
12662		 * decrement it.
12663		 */
12664		SCTP_INP_WLOCK(inp);
12665		SCTP_INP_INCR_REF(inp);
12666		SCTP_INP_WUNLOCK(inp);
12667		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12668		if (stcb == NULL) {
12669			SCTP_INP_WLOCK(inp);
12670			SCTP_INP_DECR_REF(inp);
12671			SCTP_INP_WUNLOCK(inp);
12672		} else {
12673			hold_tcblock = 1;
12674		}
12675	}
12676	if ((stcb == NULL) && (addr)) {
12677		/* Possible implicit send? */
12678		SCTP_ASOC_CREATE_LOCK(inp);
12679		create_lock_applied = 1;
12680		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12681		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12682			/* Should I really unlock ? */
12683			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12684			error = EINVAL;
12685			goto out_unlocked;
12686
12687		}
12688		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12689		    (addr->sa_family == AF_INET6)) {
12690			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12691			error = EINVAL;
12692			goto out_unlocked;
12693		}
12694		SCTP_INP_WLOCK(inp);
12695		SCTP_INP_INCR_REF(inp);
12696		SCTP_INP_WUNLOCK(inp);
12697		/* With the lock applied look again */
12698		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12699		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12700			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12701		}
12702		if (stcb == NULL) {
12703			SCTP_INP_WLOCK(inp);
12704			SCTP_INP_DECR_REF(inp);
12705			SCTP_INP_WUNLOCK(inp);
12706		} else {
12707			hold_tcblock = 1;
12708		}
12709		if (error) {
12710			goto out_unlocked;
12711		}
12712		if (t_inp != inp) {
12713			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12714			error = ENOTCONN;
12715			goto out_unlocked;
12716		}
12717	}
12718	if (stcb == NULL) {
12719		if (addr == NULL) {
12720			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12721			error = ENOENT;
12722			goto out_unlocked;
12723		} else {
12724			/* We must go ahead and start the INIT process */
12725			uint32_t vrf_id;
12726
12727			if ((sinfo_flags & SCTP_ABORT) ||
12728			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12729				/*-
12730				 * User asks to abort a non-existant assoc,
12731				 * or EOF a non-existant assoc with no data
12732				 */
12733				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12734				error = ENOENT;
12735				goto out_unlocked;
12736			}
12737			/* get an asoc/stcb struct */
12738			vrf_id = inp->def_vrf_id;
12739#ifdef INVARIANTS
12740			if (create_lock_applied == 0) {
12741				panic("Error, should hold create lock and I don't?");
12742			}
12743#endif
12744			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12745			    inp->sctp_ep.pre_open_stream_count,
12746			    inp->sctp_ep.port,
12747			    p);
12748			if (stcb == NULL) {
12749				/* Error is setup for us in the call */
12750				goto out_unlocked;
12751			}
12752			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12753				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12754				/*
12755				 * Set the connected flag so we can queue
12756				 * data
12757				 */
12758				soisconnecting(so);
12759			}
12760			hold_tcblock = 1;
12761			if (create_lock_applied) {
12762				SCTP_ASOC_CREATE_UNLOCK(inp);
12763				create_lock_applied = 0;
12764			} else {
12765				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12766			}
12767			/*
12768			 * Turn on queue only flag to prevent data from
12769			 * being sent
12770			 */
12771			queue_only = 1;
12772			asoc = &stcb->asoc;
12773			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12774			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12775
12776			/* initialize authentication params for the assoc */
12777			sctp_initialize_auth_params(inp, stcb);
12778
12779			if (control) {
12780				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12781					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12782					    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12783					hold_tcblock = 0;
12784					stcb = NULL;
12785					goto out_unlocked;
12786				}
12787			}
12788			/* out with the INIT */
12789			queue_only_for_init = 1;
12790			/*-
12791			 * we may want to dig in after this call and adjust the MTU
12792			 * value. It defaulted to 1500 (constant) but the ro
12793			 * structure may now have an update and thus we may need to
12794			 * change it BEFORE we append the message.
12795			 */
12796		}
12797	} else
12798		asoc = &stcb->asoc;
12799	if (srcv == NULL)
12800		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12801	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12802		if (addr)
12803			net = sctp_findnet(stcb, addr);
12804		else
12805			net = NULL;
12806		if ((net == NULL) ||
12807		    ((port != 0) && (port != stcb->rport))) {
12808			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12809			error = EINVAL;
12810			goto out_unlocked;
12811		}
12812	} else {
12813		if (stcb->asoc.alternate) {
12814			net = stcb->asoc.alternate;
12815		} else {
12816			net = stcb->asoc.primary_destination;
12817		}
12818	}
12819	atomic_add_int(&stcb->total_sends, 1);
12820	/* Keep the stcb from being freed under our feet */
12821	atomic_add_int(&asoc->refcnt, 1);
12822	free_cnt_applied = 1;
12823
12824	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12825		if (sndlen > asoc->smallest_mtu) {
12826			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12827			error = EMSGSIZE;
12828			goto out_unlocked;
12829		}
12830	}
12831	if (SCTP_SO_IS_NBIO(so)
12832	    || (flags & MSG_NBIO)
12833	    ) {
12834		non_blocking = 1;
12835	}
12836	/* would we block? */
12837	if (non_blocking) {
12838		uint32_t amount;
12839
12840		if (hold_tcblock == 0) {
12841			SCTP_TCB_LOCK(stcb);
12842			hold_tcblock = 1;
12843		}
12844		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12845		if (user_marks_eor == 0) {
12846			amount = sndlen;
12847		} else {
12848			amount = 1;
12849		}
12850		if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12851		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12852			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12853			if (sndlen > SCTP_SB_LIMIT_SND(so))
12854				error = EMSGSIZE;
12855			else
12856				error = EWOULDBLOCK;
12857			goto out_unlocked;
12858		}
12859		stcb->asoc.sb_send_resv += sndlen;
12860		SCTP_TCB_UNLOCK(stcb);
12861		hold_tcblock = 0;
12862	} else {
12863		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12864	}
12865	local_soresv = sndlen;
12866	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12867		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12868		error = ECONNRESET;
12869		goto out_unlocked;
12870	}
12871	if (create_lock_applied) {
12872		SCTP_ASOC_CREATE_UNLOCK(inp);
12873		create_lock_applied = 0;
12874	}
12875	/* Is the stream no. valid? */
12876	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12877		/* Invalid stream number */
12878		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12879		error = EINVAL;
12880		goto out_unlocked;
12881	}
12882	if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12883	    (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12884		/*
12885		 * Can't queue any data while stream reset is underway.
12886		 */
12887		if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12888			error = EAGAIN;
12889		} else {
12890			error = EINVAL;
12891		}
12892		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12893		goto out_unlocked;
12894	}
12895	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12896	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12897		queue_only = 1;
12898	}
12899	/* we are now done with all control */
12900	if (control) {
12901		sctp_m_freem(control);
12902		control = NULL;
12903	}
12904	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12905	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12906	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12907	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12908		if (srcv->sinfo_flags & SCTP_ABORT) {
12909			;
12910		} else {
12911			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12912			error = ECONNRESET;
12913			goto out_unlocked;
12914		}
12915	}
12916	/* Ok, we will attempt a msgsnd :> */
12917	if (p) {
12918		p->td_ru.ru_msgsnd++;
12919	}
12920	/* Are we aborting? */
12921	if (srcv->sinfo_flags & SCTP_ABORT) {
12922		struct mbuf *mm;
12923		int tot_demand, tot_out = 0, max_out;
12924
12925		SCTP_STAT_INCR(sctps_sends_with_abort);
12926		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12927		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12928			/* It has to be up before we abort */
12929			/* how big is the user initiated abort? */
12930			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12931			error = EINVAL;
12932			goto out;
12933		}
12934		if (hold_tcblock) {
12935			SCTP_TCB_UNLOCK(stcb);
12936			hold_tcblock = 0;
12937		}
12938		if (top) {
12939			struct mbuf *cntm = NULL;
12940
12941			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12942			if (sndlen != 0) {
12943				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12944					tot_out += SCTP_BUF_LEN(cntm);
12945				}
12946			}
12947		} else {
12948			/* Must fit in a MTU */
12949			tot_out = sndlen;
12950			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12951			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12952				/* To big */
12953				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12954				error = EMSGSIZE;
12955				goto out;
12956			}
12957			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12958		}
12959		if (mm == NULL) {
12960			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12961			error = ENOMEM;
12962			goto out;
12963		}
12964		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12965		max_out -= sizeof(struct sctp_abort_msg);
12966		if (tot_out > max_out) {
12967			tot_out = max_out;
12968		}
12969		if (mm) {
12970			struct sctp_paramhdr *ph;
12971
12972			/* now move forward the data pointer */
12973			ph = mtod(mm, struct sctp_paramhdr *);
12974			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12975			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12976			ph++;
12977			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12978			if (top == NULL) {
12979				error = uiomove((caddr_t)ph, (int)tot_out, uio);
12980				if (error) {
12981					/*-
12982					 * Here if we can't get his data we
12983					 * still abort we just don't get to
12984					 * send the users note :-0
12985					 */
12986					sctp_m_freem(mm);
12987					mm = NULL;
12988				}
12989			} else {
12990				if (sndlen != 0) {
12991					SCTP_BUF_NEXT(mm) = top;
12992				}
12993			}
12994		}
12995		if (hold_tcblock == 0) {
12996			SCTP_TCB_LOCK(stcb);
12997		}
12998		atomic_add_int(&stcb->asoc.refcnt, -1);
12999		free_cnt_applied = 0;
13000		/* release this lock, otherwise we hang on ourselves */
13001		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13002		/* now relock the stcb so everything is sane */
13003		hold_tcblock = 0;
13004		stcb = NULL;
13005		/*
13006		 * In this case top is already chained to mm avoid double
13007		 * free, since we free it below if top != NULL and driver
13008		 * would free it after sending the packet out
13009		 */
13010		if (sndlen != 0) {
13011			top = NULL;
13012		}
13013		goto out_unlocked;
13014	}
13015	/* Calculate the maximum we can send */
13016	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13017	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13018		if (non_blocking) {
13019			/* we already checked for non-blocking above. */
13020			max_len = sndlen;
13021		} else {
13022			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13023		}
13024	} else {
13025		max_len = 0;
13026	}
13027	if (hold_tcblock) {
13028		SCTP_TCB_UNLOCK(stcb);
13029		hold_tcblock = 0;
13030	}
13031	if (asoc->strmout == NULL) {
13032		/* huh? software error */
13033		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13034		error = EFAULT;
13035		goto out_unlocked;
13036	}
13037	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
13038	if ((user_marks_eor == 0) &&
13039	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13040		/* It will NEVER fit */
13041		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13042		error = EMSGSIZE;
13043		goto out_unlocked;
13044	}
13045	if ((uio == NULL) && user_marks_eor) {
13046		/*-
13047		 * We do not support eeor mode for
13048		 * sending with mbuf chains (like sendfile).
13049		 */
13050		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13051		error = EINVAL;
13052		goto out_unlocked;
13053	}
13054	if (user_marks_eor) {
13055		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13056	} else {
13057		/*-
13058		 * For non-eeor the whole message must fit in
13059		 * the socket send buffer.
13060		 */
13061		local_add_more = sndlen;
13062	}
13063	len = 0;
13064	if (non_blocking) {
13065		goto skip_preblock;
13066	}
13067	if (((max_len <= local_add_more) &&
13068	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13069	    (max_len == 0) ||
13070	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13071		/* No room right now ! */
13072		SOCKBUF_LOCK(&so->so_snd);
13073		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13074		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13075		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13076			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13077			    (unsigned int)SCTP_SB_LIMIT_SND(so),
13078			    inqueue_bytes,
13079			    local_add_more,
13080			    stcb->asoc.stream_queue_cnt,
13081			    stcb->asoc.chunks_on_out_queue,
13082			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13083			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13084				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13085			}
13086			be.error = 0;
13087			stcb->block_entry = &be;
13088			error = sbwait(&so->so_snd);
13089			stcb->block_entry = NULL;
13090			if (error || so->so_error || be.error) {
13091				if (error == 0) {
13092					if (so->so_error)
13093						error = so->so_error;
13094					if (be.error) {
13095						error = be.error;
13096					}
13097				}
13098				SOCKBUF_UNLOCK(&so->so_snd);
13099				goto out_unlocked;
13100			}
13101			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13102				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13103				    asoc, stcb->asoc.total_output_queue_size);
13104			}
13105			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13106				SOCKBUF_UNLOCK(&so->so_snd);
13107				goto out_unlocked;
13108			}
13109			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13110		}
13111		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13112			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13113		} else {
13114			max_len = 0;
13115		}
13116		SOCKBUF_UNLOCK(&so->so_snd);
13117	}
13118skip_preblock:
13119	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13120		goto out_unlocked;
13121	}
13122	/*
13123	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13124	 * case NOTE: uio will be null when top/mbuf is passed
13125	 */
13126	if (sndlen == 0) {
13127		if (srcv->sinfo_flags & SCTP_EOF) {
13128			got_all_of_the_send = 1;
13129			goto dataless_eof;
13130		} else {
13131			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13132			error = EINVAL;
13133			goto out;
13134		}
13135	}
13136	if (top == NULL) {
13137		struct sctp_stream_queue_pending *sp;
13138		struct sctp_stream_out *strm;
13139		uint32_t sndout;
13140
13141		SCTP_TCB_SEND_LOCK(stcb);
13142		if ((asoc->stream_locked) &&
13143		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
13144			SCTP_TCB_SEND_UNLOCK(stcb);
13145			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13146			error = EINVAL;
13147			goto out;
13148		}
13149		SCTP_TCB_SEND_UNLOCK(stcb);
13150
13151		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13152		if (strm->last_msg_incomplete == 0) {
13153	do_a_copy_in:
13154			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13155			if ((sp == NULL) || (error)) {
13156				goto out;
13157			}
13158			SCTP_TCB_SEND_LOCK(stcb);
13159			if (sp->msg_is_complete) {
13160				strm->last_msg_incomplete = 0;
13161				asoc->stream_locked = 0;
13162			} else {
13163				/*
13164				 * Just got locked to this guy in case of an
13165				 * interrupt.
13166				 */
13167				strm->last_msg_incomplete = 1;
13168				if (stcb->asoc.idata_supported == 0) {
13169					asoc->stream_locked = 1;
13170					asoc->stream_locked_on = srcv->sinfo_stream;
13171				}
13172				sp->sender_all_done = 0;
13173			}
13174			sctp_snd_sb_alloc(stcb, sp->length);
13175			atomic_add_int(&asoc->stream_queue_cnt, 1);
13176			if (srcv->sinfo_flags & SCTP_UNORDERED) {
13177				SCTP_STAT_INCR(sctps_sends_with_unord);
13178			}
13179			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13180			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13181			SCTP_TCB_SEND_UNLOCK(stcb);
13182		} else {
13183			SCTP_TCB_SEND_LOCK(stcb);
13184			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13185			SCTP_TCB_SEND_UNLOCK(stcb);
13186			if (sp == NULL) {
13187				/* ???? Huh ??? last msg is gone */
13188#ifdef INVARIANTS
13189				panic("Warning: Last msg marked incomplete, yet nothing left?");
13190#else
13191				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13192				strm->last_msg_incomplete = 0;
13193#endif
13194				goto do_a_copy_in;
13195
13196			}
13197		}
13198		while (uio->uio_resid > 0) {
13199			/* How much room do we have? */
13200			struct mbuf *new_tail, *mm;
13201
13202			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13203			if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13204				max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13205			else
13206				max_len = 0;
13207
13208			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13209			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13210			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13211				sndout = 0;
13212				new_tail = NULL;
13213				if (hold_tcblock) {
13214					SCTP_TCB_UNLOCK(stcb);
13215					hold_tcblock = 0;
13216				}
13217				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13218				if ((mm == NULL) || error) {
13219					if (mm) {
13220						sctp_m_freem(mm);
13221					}
13222					goto out;
13223				}
13224				/* Update the mbuf and count */
13225				SCTP_TCB_SEND_LOCK(stcb);
13226				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13227					/*
13228					 * we need to get out. Peer probably
13229					 * aborted.
13230					 */
13231					sctp_m_freem(mm);
13232					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13233						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13234						error = ECONNRESET;
13235					}
13236					SCTP_TCB_SEND_UNLOCK(stcb);
13237					goto out;
13238				}
13239				if (sp->tail_mbuf) {
13240					/* tack it to the end */
13241					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13242					sp->tail_mbuf = new_tail;
13243				} else {
13244					/* A stolen mbuf */
13245					sp->data = mm;
13246					sp->tail_mbuf = new_tail;
13247				}
13248				sctp_snd_sb_alloc(stcb, sndout);
13249				atomic_add_int(&sp->length, sndout);
13250				len += sndout;
13251				if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13252					sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13253				}
13254				/* Did we reach EOR? */
13255				if ((uio->uio_resid == 0) &&
13256				    ((user_marks_eor == 0) ||
13257				    (srcv->sinfo_flags & SCTP_EOF) ||
13258				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13259					sp->msg_is_complete = 1;
13260				} else {
13261					sp->msg_is_complete = 0;
13262				}
13263				SCTP_TCB_SEND_UNLOCK(stcb);
13264			}
13265			if (uio->uio_resid == 0) {
13266				/* got it all? */
13267				continue;
13268			}
13269			/* PR-SCTP? */
13270			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13271				/*
13272				 * This is ugly but we must assure locking
13273				 * order
13274				 */
13275				if (hold_tcblock == 0) {
13276					SCTP_TCB_LOCK(stcb);
13277					hold_tcblock = 1;
13278				}
13279				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13280				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13281				if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13282					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13283				else
13284					max_len = 0;
13285				if (max_len > 0) {
13286					continue;
13287				}
13288				SCTP_TCB_UNLOCK(stcb);
13289				hold_tcblock = 0;
13290			}
13291			/* wait for space now */
13292			if (non_blocking) {
13293				/* Non-blocking io in place out */
13294				goto skip_out_eof;
13295			}
13296			/* What about the INIT, send it maybe */
13297			if (queue_only_for_init) {
13298				if (hold_tcblock == 0) {
13299					SCTP_TCB_LOCK(stcb);
13300					hold_tcblock = 1;
13301				}
13302				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13303					/* a collision took us forward? */
13304					queue_only = 0;
13305				} else {
13306					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13307					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13308					queue_only = 1;
13309				}
13310			}
13311			if ((net->flight_size > net->cwnd) &&
13312			    (asoc->sctp_cmt_on_off == 0)) {
13313				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13314				queue_only = 1;
13315			} else if (asoc->ifp_had_enobuf) {
13316				SCTP_STAT_INCR(sctps_ifnomemqueued);
13317				if (net->flight_size > (2 * net->mtu)) {
13318					queue_only = 1;
13319				}
13320				asoc->ifp_had_enobuf = 0;
13321			}
13322			un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13323			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13324			    (stcb->asoc.total_flight > 0) &&
13325			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13326			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13327
13328				/*-
13329				 * Ok, Nagle is set on and we have data outstanding.
13330				 * Don't send anything and let SACKs drive out the
13331				 * data unless we have a "full" segment to send.
13332				 */
13333				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13334					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13335				}
13336				SCTP_STAT_INCR(sctps_naglequeued);
13337				nagle_applies = 1;
13338			} else {
13339				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13340					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13341						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13342				}
13343				SCTP_STAT_INCR(sctps_naglesent);
13344				nagle_applies = 0;
13345			}
13346			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13347
13348				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13349				    nagle_applies, un_sent);
13350				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13351				    stcb->asoc.total_flight,
13352				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13353			}
13354			if (queue_only_for_init)
13355				queue_only_for_init = 0;
13356			if ((queue_only == 0) && (nagle_applies == 0)) {
13357				/*-
13358				 * need to start chunk output
13359				 * before blocking.. note that if
13360				 * a lock is already applied, then
13361				 * the input via the net is happening
13362				 * and I don't need to start output :-D
13363				 */
13364				if (hold_tcblock == 0) {
13365					if (SCTP_TCB_TRYLOCK(stcb)) {
13366						hold_tcblock = 1;
13367						sctp_chunk_output(inp,
13368						    stcb,
13369						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13370					}
13371				} else {
13372					sctp_chunk_output(inp,
13373					    stcb,
13374					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13375				}
13376				if (hold_tcblock == 1) {
13377					SCTP_TCB_UNLOCK(stcb);
13378					hold_tcblock = 0;
13379				}
13380			}
13381			SOCKBUF_LOCK(&so->so_snd);
13382			/*-
13383			 * This is a bit strange, but I think it will
13384			 * work. The total_output_queue_size is locked and
13385			 * protected by the TCB_LOCK, which we just released.
13386			 * There is a race that can occur between releasing it
13387			 * above, and me getting the socket lock, where sacks
13388			 * come in but we have not put the SB_WAIT on the
13389			 * so_snd buffer to get the wakeup. After the LOCK
13390			 * is applied the sack_processing will also need to
13391			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13392			 * once we have the socket buffer lock if we recheck the
13393			 * size we KNOW we will get to sleep safely with the
13394			 * wakeup flag in place.
13395			 */
13396			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13397			if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13398			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13399				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13400					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13401					    asoc, (size_t)uio->uio_resid);
13402				}
13403				be.error = 0;
13404				stcb->block_entry = &be;
13405				error = sbwait(&so->so_snd);
13406				stcb->block_entry = NULL;
13407
13408				if (error || so->so_error || be.error) {
13409					if (error == 0) {
13410						if (so->so_error)
13411							error = so->so_error;
13412						if (be.error) {
13413							error = be.error;
13414						}
13415					}
13416					SOCKBUF_UNLOCK(&so->so_snd);
13417					goto out_unlocked;
13418				}
13419				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13420					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13421					    asoc, stcb->asoc.total_output_queue_size);
13422				}
13423			}
13424			SOCKBUF_UNLOCK(&so->so_snd);
13425			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13426				goto out_unlocked;
13427			}
13428		}
13429		SCTP_TCB_SEND_LOCK(stcb);
13430		if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13431			SCTP_TCB_SEND_UNLOCK(stcb);
13432			goto out_unlocked;
13433		}
13434		if (sp) {
13435			if (sp->msg_is_complete == 0) {
13436				strm->last_msg_incomplete = 1;
13437				if (stcb->asoc.idata_supported == 0) {
13438					asoc->stream_locked = 1;
13439					asoc->stream_locked_on = srcv->sinfo_stream;
13440				}
13441			} else {
13442				sp->sender_all_done = 1;
13443				strm->last_msg_incomplete = 0;
13444				asoc->stream_locked = 0;
13445			}
13446		} else {
13447			SCTP_PRINTF("Huh no sp TSNH?\n");
13448			strm->last_msg_incomplete = 0;
13449			asoc->stream_locked = 0;
13450		}
13451		SCTP_TCB_SEND_UNLOCK(stcb);
13452		if (uio->uio_resid == 0) {
13453			got_all_of_the_send = 1;
13454		}
13455	} else {
13456		/* We send in a 0, since we do NOT have any locks */
13457		error = sctp_msg_append(stcb, net, top, srcv, 0);
13458		top = NULL;
13459		if (srcv->sinfo_flags & SCTP_EOF) {
13460			/*
13461			 * This should only happen for Panda for the mbuf
13462			 * send case, which does NOT yet support EEOR mode.
13463			 * Thus, we can just set this flag to do the proper
13464			 * EOF handling.
13465			 */
13466			got_all_of_the_send = 1;
13467		}
13468	}
13469	if (error) {
13470		goto out;
13471	}
13472dataless_eof:
13473	/* EOF thing ? */
13474	if ((srcv->sinfo_flags & SCTP_EOF) &&
13475	    (got_all_of_the_send == 1)) {
13476		SCTP_STAT_INCR(sctps_sends_with_eof);
13477		error = 0;
13478		if (hold_tcblock == 0) {
13479			SCTP_TCB_LOCK(stcb);
13480			hold_tcblock = 1;
13481		}
13482		if (TAILQ_EMPTY(&asoc->send_queue) &&
13483		    TAILQ_EMPTY(&asoc->sent_queue) &&
13484		    sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13485			if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13486				goto abort_anyway;
13487			}
13488			/* there is nothing queued to send, so I'm done... */
13489			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13490			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13491			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13492				struct sctp_nets *netp;
13493
13494				/* only send SHUTDOWN the first time through */
13495				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13496					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13497				}
13498				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13499				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13500				sctp_stop_timers_for_shutdown(stcb);
13501				if (stcb->asoc.alternate) {
13502					netp = stcb->asoc.alternate;
13503				} else {
13504					netp = stcb->asoc.primary_destination;
13505				}
13506				sctp_send_shutdown(stcb, netp);
13507				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13508				    netp);
13509				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13510				    asoc->primary_destination);
13511			}
13512		} else {
13513			/*-
13514			 * we still got (or just got) data to send, so set
13515			 * SHUTDOWN_PENDING
13516			 */
13517			/*-
13518			 * XXX sockets draft says that SCTP_EOF should be
13519			 * sent with no data.  currently, we will allow user
13520			 * data to be sent first and move to
13521			 * SHUTDOWN-PENDING
13522			 */
13523			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13524			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13525			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13526				if (hold_tcblock == 0) {
13527					SCTP_TCB_LOCK(stcb);
13528					hold_tcblock = 1;
13529				}
13530				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13531					asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13532				}
13533				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13534				if (TAILQ_EMPTY(&asoc->send_queue) &&
13535				    TAILQ_EMPTY(&asoc->sent_queue) &&
13536				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13537					struct mbuf *op_err;
13538					char msg[SCTP_DIAG_INFO_LEN];
13539
13540			abort_anyway:
13541					if (free_cnt_applied) {
13542						atomic_add_int(&stcb->asoc.refcnt, -1);
13543						free_cnt_applied = 0;
13544					}
13545					snprintf(msg, sizeof(msg),
13546					    "%s:%d at %s", __FILE__, __LINE__, __func__);
13547					op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13548					    msg);
13549					sctp_abort_an_association(stcb->sctp_ep, stcb,
13550					    op_err, SCTP_SO_LOCKED);
13551					/*
13552					 * now relock the stcb so everything
13553					 * is sane
13554					 */
13555					hold_tcblock = 0;
13556					stcb = NULL;
13557					goto out;
13558				}
13559				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13560				    asoc->primary_destination);
13561				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13562			}
13563		}
13564	}
13565skip_out_eof:
13566	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13567		some_on_control = 1;
13568	}
13569	if (queue_only_for_init) {
13570		if (hold_tcblock == 0) {
13571			SCTP_TCB_LOCK(stcb);
13572			hold_tcblock = 1;
13573		}
13574		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13575			/* a collision took us forward? */
13576			queue_only = 0;
13577		} else {
13578			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13579			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13580			queue_only = 1;
13581		}
13582	}
13583	if ((net->flight_size > net->cwnd) &&
13584	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13585		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13586		queue_only = 1;
13587	} else if (asoc->ifp_had_enobuf) {
13588		SCTP_STAT_INCR(sctps_ifnomemqueued);
13589		if (net->flight_size > (2 * net->mtu)) {
13590			queue_only = 1;
13591		}
13592		asoc->ifp_had_enobuf = 0;
13593	}
13594	un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13595	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13596	    (stcb->asoc.total_flight > 0) &&
13597	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13598	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13599		/*-
13600		 * Ok, Nagle is set on and we have data outstanding.
13601		 * Don't send anything and let SACKs drive out the
13602		 * data unless wen have a "full" segment to send.
13603		 */
13604		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13605			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13606		}
13607		SCTP_STAT_INCR(sctps_naglequeued);
13608		nagle_applies = 1;
13609	} else {
13610		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13611			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13612				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13613		}
13614		SCTP_STAT_INCR(sctps_naglesent);
13615		nagle_applies = 0;
13616	}
13617	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13618		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13619		    nagle_applies, un_sent);
13620		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13621		    stcb->asoc.total_flight,
13622		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13623	}
13624	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13625		/* we can attempt to send too. */
13626		if (hold_tcblock == 0) {
13627			/*
13628			 * If there is activity recv'ing sacks no need to
13629			 * send
13630			 */
13631			if (SCTP_TCB_TRYLOCK(stcb)) {
13632				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13633				hold_tcblock = 1;
13634			}
13635		} else {
13636			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13637		}
13638	} else if ((queue_only == 0) &&
13639		    (stcb->asoc.peers_rwnd == 0) &&
13640	    (stcb->asoc.total_flight == 0)) {
13641		/* We get to have a probe outstanding */
13642		if (hold_tcblock == 0) {
13643			hold_tcblock = 1;
13644			SCTP_TCB_LOCK(stcb);
13645		}
13646		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13647	} else if (some_on_control) {
13648		int num_out, reason, frag_point;
13649
13650		/* Here we do control only */
13651		if (hold_tcblock == 0) {
13652			hold_tcblock = 1;
13653			SCTP_TCB_LOCK(stcb);
13654		}
13655		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13656		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13657		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13658	}
13659	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13660	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13661	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13662	    stcb->asoc.total_output_queue_size, error);
13663
13664out:
13665out_unlocked:
13666
13667	if (local_soresv && stcb) {
13668		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13669	}
13670	if (create_lock_applied) {
13671		SCTP_ASOC_CREATE_UNLOCK(inp);
13672	}
13673	if ((stcb) && hold_tcblock) {
13674		SCTP_TCB_UNLOCK(stcb);
13675	}
13676	if (stcb && free_cnt_applied) {
13677		atomic_add_int(&stcb->asoc.refcnt, -1);
13678	}
13679#ifdef INVARIANTS
13680	if (stcb) {
13681		if (mtx_owned(&stcb->tcb_mtx)) {
13682			panic("Leaving with tcb mtx owned?");
13683		}
13684		if (mtx_owned(&stcb->tcb_send_mtx)) {
13685			panic("Leaving with tcb send mtx owned?");
13686		}
13687	}
13688#endif
13689	if (top) {
13690		sctp_m_freem(top);
13691	}
13692	if (control) {
13693		sctp_m_freem(control);
13694	}
13695	return (error);
13696}
13697
13698
13699/*
13700 * generate an AUTHentication chunk, if required
13701 */
13702struct mbuf *
13703sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13704    struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13705    struct sctp_tcb *stcb, uint8_t chunk)
13706{
13707	struct mbuf *m_auth;
13708	struct sctp_auth_chunk *auth;
13709	int chunk_len;
13710	struct mbuf *cn;
13711
13712	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13713	    (stcb == NULL))
13714		return (m);
13715
13716	if (stcb->asoc.auth_supported == 0) {
13717		return (m);
13718	}
13719	/* does the requested chunk require auth? */
13720	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13721		return (m);
13722	}
13723	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13724	if (m_auth == NULL) {
13725		/* no mbuf's */
13726		return (m);
13727	}
13728	/* reserve some space if this will be the first mbuf */
13729	if (m == NULL)
13730		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13731	/* fill in the AUTH chunk details */
13732	auth = mtod(m_auth, struct sctp_auth_chunk *);
13733	memset(auth, 0, sizeof(*auth));
13734	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13735	auth->ch.chunk_flags = 0;
13736	chunk_len = sizeof(*auth) +
13737	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13738	auth->ch.chunk_length = htons(chunk_len);
13739	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13740	/* key id and hmac digest will be computed and filled in upon send */
13741
13742	/* save the offset where the auth was inserted into the chain */
13743	*offset = 0;
13744	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13745		*offset += SCTP_BUF_LEN(cn);
13746	}
13747
13748	/* update length and return pointer to the auth chunk */
13749	SCTP_BUF_LEN(m_auth) = chunk_len;
13750	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13751	if (auth_ret != NULL)
13752		*auth_ret = auth;
13753
13754	return (m);
13755}
13756
13757#ifdef INET6
13758int
13759sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13760{
13761	struct nd_prefix *pfx = NULL;
13762	struct nd_pfxrouter *pfxrtr = NULL;
13763	struct sockaddr_in6 gw6;
13764
13765	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13766		return (0);
13767
13768	/* get prefix entry of address */
13769	ND6_RLOCK();
13770	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13771		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13772			continue;
13773		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13774		    &src6->sin6_addr, &pfx->ndpr_mask))
13775			break;
13776	}
13777	/* no prefix entry in the prefix list */
13778	if (pfx == NULL) {
13779		ND6_RUNLOCK();
13780		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13781		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13782		return (0);
13783	}
13784	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13785	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13786
13787	/* search installed gateway from prefix entry */
13788	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13789		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13790		gw6.sin6_family = AF_INET6;
13791		gw6.sin6_len = sizeof(struct sockaddr_in6);
13792		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13793		    sizeof(struct in6_addr));
13794		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13795		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13796		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13797		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13798		if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13799			ND6_RUNLOCK();
13800			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13801			ND6_RUNLOCK();
13802			return (1);
13803		}
13804	}
13805	ND6_RUNLOCK();
13806	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13807	return (0);
13808}
13809#endif
13810
13811int
13812sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13813{
13814#ifdef INET
13815	struct sockaddr_in *sin, *mask;
13816	struct ifaddr *ifa;
13817	struct in_addr srcnetaddr, gwnetaddr;
13818
13819	if (ro == NULL || ro->ro_rt == NULL ||
13820	    sifa->address.sa.sa_family != AF_INET) {
13821		return (0);
13822	}
13823	ifa = (struct ifaddr *)sifa->ifa;
13824	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13825	sin = &sifa->address.sin;
13826	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13827	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13828	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13829	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13830
13831	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13832	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13833	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13834	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13835	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13836	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13837		return (1);
13838	}
13839#endif
13840	return (0);
13841}
13842