sctp_output.c revision 284438 
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/10/sys/netinet/sctp_output.c 284438 2015-06-16 08:21:58Z 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
70struct 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 *parmh;
1944	struct mbuf *mret;
1945	uint16_t plen;
1946
1947#endif
1948
1949	switch (ifa->address.sa.sa_family) {
1950#ifdef INET
1951	case AF_INET:
1952		plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1953		break;
1954#endif
1955#ifdef INET6
1956	case AF_INET6:
1957		plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1958		break;
1959#endif
1960	default:
1961		return (m);
1962	}
1963#if defined(INET) || defined(INET6)
1964	if (M_TRAILINGSPACE(m) >= plen) {
1965		/* easy side we just drop it on the end */
1966		parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1967		mret = m;
1968	} else {
1969		/* Need more space */
1970		mret = m;
1971		while (SCTP_BUF_NEXT(mret) != NULL) {
1972			mret = SCTP_BUF_NEXT(mret);
1973		}
1974		SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1975		if (SCTP_BUF_NEXT(mret) == NULL) {
1976			/* We are hosed, can't add more addresses */
1977			return (m);
1978		}
1979		mret = SCTP_BUF_NEXT(mret);
1980		parmh = mtod(mret, struct sctp_paramhdr *);
1981	}
1982	/* now add the parameter */
1983	switch (ifa->address.sa.sa_family) {
1984#ifdef INET
1985	case AF_INET:
1986		{
1987			struct sctp_ipv4addr_param *ipv4p;
1988			struct sockaddr_in *sin;
1989
1990			sin = &ifa->address.sin;
1991			ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992			parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993			parmh->param_length = htons(plen);
1994			ipv4p->addr = sin->sin_addr.s_addr;
1995			SCTP_BUF_LEN(mret) += plen;
1996			break;
1997		}
1998#endif
1999#ifdef INET6
2000	case AF_INET6:
2001		{
2002			struct sctp_ipv6addr_param *ipv6p;
2003			struct sockaddr_in6 *sin6;
2004
2005			sin6 = &ifa->address.sin6;
2006			ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007			parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008			parmh->param_length = htons(plen);
2009			memcpy(ipv6p->addr, &sin6->sin6_addr,
2010			    sizeof(ipv6p->addr));
2011			/* clear embedded scope in the address */
2012			in6_clearscope((struct in6_addr *)ipv6p->addr);
2013			SCTP_BUF_LEN(mret) += plen;
2014			break;
2015		}
2016#endif
2017	default:
2018		return (m);
2019	}
2020	if (len != NULL) {
2021		*len += plen;
2022	}
2023	return (mret);
2024#endif
2025}
2026
2027
2028struct mbuf *
2029sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2030    struct sctp_scoping *scope,
2031    struct mbuf *m_at, int cnt_inits_to,
2032    uint16_t * padding_len, uint16_t * chunk_len)
2033{
2034	struct sctp_vrf *vrf = NULL;
2035	int cnt, limit_out = 0, total_count;
2036	uint32_t vrf_id;
2037
2038	vrf_id = inp->def_vrf_id;
2039	SCTP_IPI_ADDR_RLOCK();
2040	vrf = sctp_find_vrf(vrf_id);
2041	if (vrf == NULL) {
2042		SCTP_IPI_ADDR_RUNLOCK();
2043		return (m_at);
2044	}
2045	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2046		struct sctp_ifa *sctp_ifap;
2047		struct sctp_ifn *sctp_ifnp;
2048
2049		cnt = cnt_inits_to;
2050		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2051			limit_out = 1;
2052			cnt = SCTP_ADDRESS_LIMIT;
2053			goto skip_count;
2054		}
2055		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2056			if ((scope->loopback_scope == 0) &&
2057			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2058				/*
2059				 * Skip loopback devices if loopback_scope
2060				 * not set
2061				 */
2062				continue;
2063			}
2064			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2065#ifdef INET
2066				if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2067				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2068				    &sctp_ifap->address.sin.sin_addr) != 0)) {
2069					continue;
2070				}
2071#endif
2072#ifdef INET6
2073				if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2074				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2075				    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2076					continue;
2077				}
2078#endif
2079				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2080					continue;
2081				}
2082				if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2083					continue;
2084				}
2085				cnt++;
2086				if (cnt > SCTP_ADDRESS_LIMIT) {
2087					break;
2088				}
2089			}
2090			if (cnt > SCTP_ADDRESS_LIMIT) {
2091				break;
2092			}
2093		}
2094skip_count:
2095		if (cnt > 1) {
2096			total_count = 0;
2097			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2098				cnt = 0;
2099				if ((scope->loopback_scope == 0) &&
2100				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2101					/*
2102					 * Skip loopback devices if
2103					 * loopback_scope not set
2104					 */
2105					continue;
2106				}
2107				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2108#ifdef INET
2109					if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2110					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2111					    &sctp_ifap->address.sin.sin_addr) != 0)) {
2112						continue;
2113					}
2114#endif
2115#ifdef INET6
2116					if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2117					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2118					    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2119						continue;
2120					}
2121#endif
2122					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2123						continue;
2124					}
2125					if (sctp_is_address_in_scope(sctp_ifap,
2126					    scope, 0) == 0) {
2127						continue;
2128					}
2129					if ((chunk_len != NULL) &&
2130					    (padding_len != NULL) &&
2131					    (*padding_len > 0)) {
2132						memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2133						SCTP_BUF_LEN(m_at) += *padding_len;
2134						*chunk_len += *padding_len;
2135						*padding_len = 0;
2136					}
2137					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2138					if (limit_out) {
2139						cnt++;
2140						total_count++;
2141						if (cnt >= 2) {
2142							/*
2143							 * two from each
2144							 * address
2145							 */
2146							break;
2147						}
2148						if (total_count > SCTP_ADDRESS_LIMIT) {
2149							/* No more addresses */
2150							break;
2151						}
2152					}
2153				}
2154			}
2155		}
2156	} else {
2157		struct sctp_laddr *laddr;
2158
2159		cnt = cnt_inits_to;
2160		/* First, how many ? */
2161		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162			if (laddr->ifa == NULL) {
2163				continue;
2164			}
2165			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2166				/*
2167				 * Address being deleted by the system, dont
2168				 * list.
2169				 */
2170				continue;
2171			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2172				/*
2173				 * Address being deleted on this ep don't
2174				 * list.
2175				 */
2176				continue;
2177			}
2178			if (sctp_is_address_in_scope(laddr->ifa,
2179			    scope, 1) == 0) {
2180				continue;
2181			}
2182			cnt++;
2183		}
2184		/*
2185		 * To get through a NAT we only list addresses if we have
2186		 * more than one. That way if you just bind a single address
2187		 * we let the source of the init dictate our address.
2188		 */
2189		if (cnt > 1) {
2190			cnt = cnt_inits_to;
2191			LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2192				if (laddr->ifa == NULL) {
2193					continue;
2194				}
2195				if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2196					continue;
2197				}
2198				if (sctp_is_address_in_scope(laddr->ifa,
2199				    scope, 0) == 0) {
2200					continue;
2201				}
2202				if ((chunk_len != NULL) &&
2203				    (padding_len != NULL) &&
2204				    (*padding_len > 0)) {
2205					memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2206					SCTP_BUF_LEN(m_at) += *padding_len;
2207					*chunk_len += *padding_len;
2208					*padding_len = 0;
2209				}
2210				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2211				cnt++;
2212				if (cnt >= SCTP_ADDRESS_LIMIT) {
2213					break;
2214				}
2215			}
2216		}
2217	}
2218	SCTP_IPI_ADDR_RUNLOCK();
2219	return (m_at);
2220}
2221
2222static struct sctp_ifa *
2223sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2224    uint8_t dest_is_loop,
2225    uint8_t dest_is_priv,
2226    sa_family_t fam)
2227{
2228	uint8_t dest_is_global = 0;
2229
2230	/* dest_is_priv is true if destination is a private address */
2231	/* dest_is_loop is true if destination is a loopback addresses */
2232
2233	/**
2234	 * Here we determine if its a preferred address. A preferred address
2235	 * means it is the same scope or higher scope then the destination.
2236	 * L = loopback, P = private, G = global
2237	 * -----------------------------------------
2238	 *    src    |  dest | result
2239	 *  ----------------------------------------
2240	 *     L     |    L  |    yes
2241	 *  -----------------------------------------
2242	 *     P     |    L  |    yes-v4 no-v6
2243	 *  -----------------------------------------
2244	 *     G     |    L  |    yes-v4 no-v6
2245	 *  -----------------------------------------
2246	 *     L     |    P  |    no
2247	 *  -----------------------------------------
2248	 *     P     |    P  |    yes
2249	 *  -----------------------------------------
2250	 *     G     |    P  |    no
2251	 *   -----------------------------------------
2252	 *     L     |    G  |    no
2253	 *   -----------------------------------------
2254	 *     P     |    G  |    no
2255	 *    -----------------------------------------
2256	 *     G     |    G  |    yes
2257	 *    -----------------------------------------
2258	 */
2259
2260	if (ifa->address.sa.sa_family != fam) {
2261		/* forget mis-matched family */
2262		return (NULL);
2263	}
2264	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2265		dest_is_global = 1;
2266	}
2267	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2268	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2269	/* Ok the address may be ok */
2270#ifdef INET6
2271	if (fam == AF_INET6) {
2272		/* ok to use deprecated addresses? no lets not! */
2273		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2274			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2275			return (NULL);
2276		}
2277		if (ifa->src_is_priv && !ifa->src_is_loop) {
2278			if (dest_is_loop) {
2279				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2280				return (NULL);
2281			}
2282		}
2283		if (ifa->src_is_glob) {
2284			if (dest_is_loop) {
2285				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2286				return (NULL);
2287			}
2288		}
2289	}
2290#endif
2291	/*
2292	 * Now that we know what is what, implement or table this could in
2293	 * theory be done slicker (it used to be), but this is
2294	 * straightforward and easier to validate :-)
2295	 */
2296	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2297	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2298	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2299	    dest_is_loop, dest_is_priv, dest_is_global);
2300
2301	if ((ifa->src_is_loop) && (dest_is_priv)) {
2302		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2303		return (NULL);
2304	}
2305	if ((ifa->src_is_glob) && (dest_is_priv)) {
2306		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2307		return (NULL);
2308	}
2309	if ((ifa->src_is_loop) && (dest_is_global)) {
2310		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2311		return (NULL);
2312	}
2313	if ((ifa->src_is_priv) && (dest_is_global)) {
2314		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2315		return (NULL);
2316	}
2317	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2318	/* its a preferred address */
2319	return (ifa);
2320}
2321
2322static struct sctp_ifa *
2323sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2324    uint8_t dest_is_loop,
2325    uint8_t dest_is_priv,
2326    sa_family_t fam)
2327{
2328	uint8_t dest_is_global = 0;
2329
2330	/**
2331	 * Here we determine if its a acceptable address. A acceptable
2332	 * address means it is the same scope or higher scope but we can
2333	 * allow for NAT which means its ok to have a global dest and a
2334	 * private src.
2335	 *
2336	 * L = loopback, P = private, G = global
2337	 * -----------------------------------------
2338	 *  src    |  dest | result
2339	 * -----------------------------------------
2340	 *   L     |   L   |    yes
2341	 *  -----------------------------------------
2342	 *   P     |   L   |    yes-v4 no-v6
2343	 *  -----------------------------------------
2344	 *   G     |   L   |    yes
2345	 * -----------------------------------------
2346	 *   L     |   P   |    no
2347	 * -----------------------------------------
2348	 *   P     |   P   |    yes
2349	 * -----------------------------------------
2350	 *   G     |   P   |    yes - May not work
2351	 * -----------------------------------------
2352	 *   L     |   G   |    no
2353	 * -----------------------------------------
2354	 *   P     |   G   |    yes - May not work
2355	 * -----------------------------------------
2356	 *   G     |   G   |    yes
2357	 * -----------------------------------------
2358	 */
2359
2360	if (ifa->address.sa.sa_family != fam) {
2361		/* forget non matching family */
2362		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2363		    ifa->address.sa.sa_family, fam);
2364		return (NULL);
2365	}
2366	/* Ok the address may be ok */
2367	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2368	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2369	    dest_is_loop, dest_is_priv);
2370	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2371		dest_is_global = 1;
2372	}
2373#ifdef INET6
2374	if (fam == AF_INET6) {
2375		/* ok to use deprecated addresses? */
2376		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2377			return (NULL);
2378		}
2379		if (ifa->src_is_priv) {
2380			/* Special case, linklocal to loop */
2381			if (dest_is_loop)
2382				return (NULL);
2383		}
2384	}
2385#endif
2386	/*
2387	 * Now that we know what is what, implement our table. This could in
2388	 * theory be done slicker (it used to be), but this is
2389	 * straightforward and easier to validate :-)
2390	 */
2391	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2392	    ifa->src_is_loop,
2393	    dest_is_priv);
2394	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2395		return (NULL);
2396	}
2397	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2398	    ifa->src_is_loop,
2399	    dest_is_global);
2400	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2401		return (NULL);
2402	}
2403	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2404	/* its an acceptable address */
2405	return (ifa);
2406}
2407
2408int
2409sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2410{
2411	struct sctp_laddr *laddr;
2412
2413	if (stcb == NULL) {
2414		/* There are no restrictions, no TCB :-) */
2415		return (0);
2416	}
2417	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2418		if (laddr->ifa == NULL) {
2419			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2420			    __FUNCTION__);
2421			continue;
2422		}
2423		if (laddr->ifa == ifa) {
2424			/* Yes it is on the list */
2425			return (1);
2426		}
2427	}
2428	return (0);
2429}
2430
2431
2432int
2433sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2434{
2435	struct sctp_laddr *laddr;
2436
2437	if (ifa == NULL)
2438		return (0);
2439	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2440		if (laddr->ifa == NULL) {
2441			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2442			    __FUNCTION__);
2443			continue;
2444		}
2445		if ((laddr->ifa == ifa) && laddr->action == 0)
2446			/* same pointer */
2447			return (1);
2448	}
2449	return (0);
2450}
2451
2452
2453
2454static struct sctp_ifa *
2455sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2456    sctp_route_t * ro,
2457    uint32_t vrf_id,
2458    int non_asoc_addr_ok,
2459    uint8_t dest_is_priv,
2460    uint8_t dest_is_loop,
2461    sa_family_t fam)
2462{
2463	struct sctp_laddr *laddr, *starting_point;
2464	void *ifn;
2465	int resettotop = 0;
2466	struct sctp_ifn *sctp_ifn;
2467	struct sctp_ifa *sctp_ifa, *sifa;
2468	struct sctp_vrf *vrf;
2469	uint32_t ifn_index;
2470
2471	vrf = sctp_find_vrf(vrf_id);
2472	if (vrf == NULL)
2473		return (NULL);
2474
2475	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2476	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2477	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2478	/*
2479	 * first question, is the ifn we will emit on in our list, if so, we
2480	 * want such an address. Note that we first looked for a preferred
2481	 * address.
2482	 */
2483	if (sctp_ifn) {
2484		/* is a preferred one on the interface we route out? */
2485		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2486#ifdef INET
2487			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2488			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2489			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2490				continue;
2491			}
2492#endif
2493#ifdef INET6
2494			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2495			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2496			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2497				continue;
2498			}
2499#endif
2500			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2501			    (non_asoc_addr_ok == 0))
2502				continue;
2503			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2504			    dest_is_loop,
2505			    dest_is_priv, fam);
2506			if (sifa == NULL)
2507				continue;
2508			if (sctp_is_addr_in_ep(inp, sifa)) {
2509				atomic_add_int(&sifa->refcount, 1);
2510				return (sifa);
2511			}
2512		}
2513	}
2514	/*
2515	 * ok, now we now need to find one on the list of the addresses. We
2516	 * can't get one on the emitting interface so let's find first a
2517	 * preferred one. If not that an acceptable one otherwise... we
2518	 * return NULL.
2519	 */
2520	starting_point = inp->next_addr_touse;
2521once_again:
2522	if (inp->next_addr_touse == NULL) {
2523		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2524		resettotop = 1;
2525	}
2526	for (laddr = inp->next_addr_touse; laddr;
2527	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2528		if (laddr->ifa == NULL) {
2529			/* address has been removed */
2530			continue;
2531		}
2532		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2533			/* address is being deleted */
2534			continue;
2535		}
2536		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2537		    dest_is_priv, fam);
2538		if (sifa == NULL)
2539			continue;
2540		atomic_add_int(&sifa->refcount, 1);
2541		return (sifa);
2542	}
2543	if (resettotop == 0) {
2544		inp->next_addr_touse = NULL;
2545		goto once_again;
2546	}
2547	inp->next_addr_touse = starting_point;
2548	resettotop = 0;
2549once_again_too:
2550	if (inp->next_addr_touse == NULL) {
2551		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552		resettotop = 1;
2553	}
2554	/* ok, what about an acceptable address in the inp */
2555	for (laddr = inp->next_addr_touse; laddr;
2556	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2557		if (laddr->ifa == NULL) {
2558			/* address has been removed */
2559			continue;
2560		}
2561		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2562			/* address is being deleted */
2563			continue;
2564		}
2565		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2566		    dest_is_priv, fam);
2567		if (sifa == NULL)
2568			continue;
2569		atomic_add_int(&sifa->refcount, 1);
2570		return (sifa);
2571	}
2572	if (resettotop == 0) {
2573		inp->next_addr_touse = NULL;
2574		goto once_again_too;
2575	}
2576	/*
2577	 * no address bound can be a source for the destination we are in
2578	 * trouble
2579	 */
2580	return (NULL);
2581}
2582
2583
2584
2585static struct sctp_ifa *
2586sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2587    struct sctp_tcb *stcb,
2588    sctp_route_t * ro,
2589    uint32_t vrf_id,
2590    uint8_t dest_is_priv,
2591    uint8_t dest_is_loop,
2592    int non_asoc_addr_ok,
2593    sa_family_t fam)
2594{
2595	struct sctp_laddr *laddr, *starting_point;
2596	void *ifn;
2597	struct sctp_ifn *sctp_ifn;
2598	struct sctp_ifa *sctp_ifa, *sifa;
2599	uint8_t start_at_beginning = 0;
2600	struct sctp_vrf *vrf;
2601	uint32_t ifn_index;
2602
2603	/*
2604	 * first question, is the ifn we will emit on in our list, if so, we
2605	 * want that one.
2606	 */
2607	vrf = sctp_find_vrf(vrf_id);
2608	if (vrf == NULL)
2609		return (NULL);
2610
2611	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2612	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2613	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2614
2615	/*
2616	 * first question, is the ifn we will emit on in our list?  If so,
2617	 * we want that one. First we look for a preferred. Second, we go
2618	 * for an acceptable.
2619	 */
2620	if (sctp_ifn) {
2621		/* first try for a preferred address on the ep */
2622		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2623#ifdef INET
2624			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2625			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2626			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2627				continue;
2628			}
2629#endif
2630#ifdef INET6
2631			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2632			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2633			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2634				continue;
2635			}
2636#endif
2637			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2638				continue;
2639			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2640				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2641				if (sifa == NULL)
2642					continue;
2643				if (((non_asoc_addr_ok == 0) &&
2644				    (sctp_is_addr_restricted(stcb, sifa))) ||
2645				    (non_asoc_addr_ok &&
2646				    (sctp_is_addr_restricted(stcb, sifa)) &&
2647				    (!sctp_is_addr_pending(stcb, sifa)))) {
2648					/* on the no-no list */
2649					continue;
2650				}
2651				atomic_add_int(&sifa->refcount, 1);
2652				return (sifa);
2653			}
2654		}
2655		/* next try for an acceptable address on the ep */
2656		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2657#ifdef INET
2658			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2659			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2660			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2661				continue;
2662			}
2663#endif
2664#ifdef INET6
2665			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2666			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2667			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2668				continue;
2669			}
2670#endif
2671			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2672				continue;
2673			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2674				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2675				if (sifa == NULL)
2676					continue;
2677				if (((non_asoc_addr_ok == 0) &&
2678				    (sctp_is_addr_restricted(stcb, sifa))) ||
2679				    (non_asoc_addr_ok &&
2680				    (sctp_is_addr_restricted(stcb, sifa)) &&
2681				    (!sctp_is_addr_pending(stcb, sifa)))) {
2682					/* on the no-no list */
2683					continue;
2684				}
2685				atomic_add_int(&sifa->refcount, 1);
2686				return (sifa);
2687			}
2688		}
2689
2690	}
2691	/*
2692	 * if we can't find one like that then we must look at all addresses
2693	 * bound to pick one at first preferable then secondly acceptable.
2694	 */
2695	starting_point = stcb->asoc.last_used_address;
2696sctp_from_the_top:
2697	if (stcb->asoc.last_used_address == NULL) {
2698		start_at_beginning = 1;
2699		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2700	}
2701	/* search beginning with the last used address */
2702	for (laddr = stcb->asoc.last_used_address; laddr;
2703	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2704		if (laddr->ifa == NULL) {
2705			/* address has been removed */
2706			continue;
2707		}
2708		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2709			/* address is being deleted */
2710			continue;
2711		}
2712		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2713		if (sifa == NULL)
2714			continue;
2715		if (((non_asoc_addr_ok == 0) &&
2716		    (sctp_is_addr_restricted(stcb, sifa))) ||
2717		    (non_asoc_addr_ok &&
2718		    (sctp_is_addr_restricted(stcb, sifa)) &&
2719		    (!sctp_is_addr_pending(stcb, sifa)))) {
2720			/* on the no-no list */
2721			continue;
2722		}
2723		stcb->asoc.last_used_address = laddr;
2724		atomic_add_int(&sifa->refcount, 1);
2725		return (sifa);
2726	}
2727	if (start_at_beginning == 0) {
2728		stcb->asoc.last_used_address = NULL;
2729		goto sctp_from_the_top;
2730	}
2731	/* now try for any higher scope than the destination */
2732	stcb->asoc.last_used_address = starting_point;
2733	start_at_beginning = 0;
2734sctp_from_the_top2:
2735	if (stcb->asoc.last_used_address == NULL) {
2736		start_at_beginning = 1;
2737		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2738	}
2739	/* search beginning with the last used address */
2740	for (laddr = stcb->asoc.last_used_address; laddr;
2741	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2742		if (laddr->ifa == NULL) {
2743			/* address has been removed */
2744			continue;
2745		}
2746		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2747			/* address is being deleted */
2748			continue;
2749		}
2750		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2751		    dest_is_priv, fam);
2752		if (sifa == NULL)
2753			continue;
2754		if (((non_asoc_addr_ok == 0) &&
2755		    (sctp_is_addr_restricted(stcb, sifa))) ||
2756		    (non_asoc_addr_ok &&
2757		    (sctp_is_addr_restricted(stcb, sifa)) &&
2758		    (!sctp_is_addr_pending(stcb, sifa)))) {
2759			/* on the no-no list */
2760			continue;
2761		}
2762		stcb->asoc.last_used_address = laddr;
2763		atomic_add_int(&sifa->refcount, 1);
2764		return (sifa);
2765	}
2766	if (start_at_beginning == 0) {
2767		stcb->asoc.last_used_address = NULL;
2768		goto sctp_from_the_top2;
2769	}
2770	return (NULL);
2771}
2772
2773static struct sctp_ifa *
2774sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2775    struct sctp_inpcb *inp,
2776    struct sctp_tcb *stcb,
2777    int non_asoc_addr_ok,
2778    uint8_t dest_is_loop,
2779    uint8_t dest_is_priv,
2780    int addr_wanted,
2781    sa_family_t fam,
2782    sctp_route_t * ro
2783)
2784{
2785	struct sctp_ifa *ifa, *sifa;
2786	int num_eligible_addr = 0;
2787
2788#ifdef INET6
2789	struct sockaddr_in6 sin6, lsa6;
2790
2791	if (fam == AF_INET6) {
2792		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2793		(void)sa6_recoverscope(&sin6);
2794	}
2795#endif				/* INET6 */
2796	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2797#ifdef INET
2798		if ((ifa->address.sa.sa_family == AF_INET) &&
2799		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2800		    &ifa->address.sin.sin_addr) != 0)) {
2801			continue;
2802		}
2803#endif
2804#ifdef INET6
2805		if ((ifa->address.sa.sa_family == AF_INET6) &&
2806		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2807		    &ifa->address.sin6.sin6_addr) != 0)) {
2808			continue;
2809		}
2810#endif
2811		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2812		    (non_asoc_addr_ok == 0))
2813			continue;
2814		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2815		    dest_is_priv, fam);
2816		if (sifa == NULL)
2817			continue;
2818#ifdef INET6
2819		if (fam == AF_INET6 &&
2820		    dest_is_loop &&
2821		    sifa->src_is_loop && sifa->src_is_priv) {
2822			/*
2823			 * don't allow fe80::1 to be a src on loop ::1, we
2824			 * don't list it to the peer so we will get an
2825			 * abort.
2826			 */
2827			continue;
2828		}
2829		if (fam == AF_INET6 &&
2830		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2831		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2832			/*
2833			 * link-local <-> link-local must belong to the same
2834			 * scope.
2835			 */
2836			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2837			(void)sa6_recoverscope(&lsa6);
2838			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2839				continue;
2840			}
2841		}
2842#endif				/* INET6 */
2843
2844		/*
2845		 * Check if the IPv6 address matches to next-hop. In the
2846		 * mobile case, old IPv6 address may be not deleted from the
2847		 * interface. Then, the interface has previous and new
2848		 * addresses.  We should use one corresponding to the
2849		 * next-hop.  (by micchie)
2850		 */
2851#ifdef INET6
2852		if (stcb && fam == AF_INET6 &&
2853		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2854			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2855			    == 0) {
2856				continue;
2857			}
2858		}
2859#endif
2860#ifdef INET
2861		/* Avoid topologically incorrect IPv4 address */
2862		if (stcb && fam == AF_INET &&
2863		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2864			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2865				continue;
2866			}
2867		}
2868#endif
2869		if (stcb) {
2870			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2871				continue;
2872			}
2873			if (((non_asoc_addr_ok == 0) &&
2874			    (sctp_is_addr_restricted(stcb, sifa))) ||
2875			    (non_asoc_addr_ok &&
2876			    (sctp_is_addr_restricted(stcb, sifa)) &&
2877			    (!sctp_is_addr_pending(stcb, sifa)))) {
2878				/*
2879				 * It is restricted for some reason..
2880				 * probably not yet added.
2881				 */
2882				continue;
2883			}
2884		}
2885		if (num_eligible_addr >= addr_wanted) {
2886			return (sifa);
2887		}
2888		num_eligible_addr++;
2889	}
2890	return (NULL);
2891}
2892
2893
2894static int
2895sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2896    struct sctp_inpcb *inp,
2897    struct sctp_tcb *stcb,
2898    int non_asoc_addr_ok,
2899    uint8_t dest_is_loop,
2900    uint8_t dest_is_priv,
2901    sa_family_t fam)
2902{
2903	struct sctp_ifa *ifa, *sifa;
2904	int num_eligible_addr = 0;
2905
2906	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2907#ifdef INET
2908		if ((ifa->address.sa.sa_family == AF_INET) &&
2909		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2910		    &ifa->address.sin.sin_addr) != 0)) {
2911			continue;
2912		}
2913#endif
2914#ifdef INET6
2915		if ((ifa->address.sa.sa_family == AF_INET6) &&
2916		    (stcb != NULL) &&
2917		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2918		    &ifa->address.sin6.sin6_addr) != 0)) {
2919			continue;
2920		}
2921#endif
2922		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2923		    (non_asoc_addr_ok == 0)) {
2924			continue;
2925		}
2926		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2927		    dest_is_priv, fam);
2928		if (sifa == NULL) {
2929			continue;
2930		}
2931		if (stcb) {
2932			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2933				continue;
2934			}
2935			if (((non_asoc_addr_ok == 0) &&
2936			    (sctp_is_addr_restricted(stcb, sifa))) ||
2937			    (non_asoc_addr_ok &&
2938			    (sctp_is_addr_restricted(stcb, sifa)) &&
2939			    (!sctp_is_addr_pending(stcb, sifa)))) {
2940				/*
2941				 * It is restricted for some reason..
2942				 * probably not yet added.
2943				 */
2944				continue;
2945			}
2946		}
2947		num_eligible_addr++;
2948	}
2949	return (num_eligible_addr);
2950}
2951
2952static struct sctp_ifa *
2953sctp_choose_boundall(struct sctp_inpcb *inp,
2954    struct sctp_tcb *stcb,
2955    struct sctp_nets *net,
2956    sctp_route_t * ro,
2957    uint32_t vrf_id,
2958    uint8_t dest_is_priv,
2959    uint8_t dest_is_loop,
2960    int non_asoc_addr_ok,
2961    sa_family_t fam)
2962{
2963	int cur_addr_num = 0, num_preferred = 0;
2964	void *ifn;
2965	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2966	struct sctp_ifa *sctp_ifa, *sifa;
2967	uint32_t ifn_index;
2968	struct sctp_vrf *vrf;
2969
2970#ifdef INET
2971	int retried = 0;
2972
2973#endif
2974
2975	/*-
2976	 * For boundall we can use any address in the association.
2977	 * If non_asoc_addr_ok is set we can use any address (at least in
2978	 * theory). So we look for preferred addresses first. If we find one,
2979	 * we use it. Otherwise we next try to get an address on the
2980	 * interface, which we should be able to do (unless non_asoc_addr_ok
2981	 * is false and we are routed out that way). In these cases where we
2982	 * can't use the address of the interface we go through all the
2983	 * ifn's looking for an address we can use and fill that in. Punting
2984	 * means we send back address 0, which will probably cause problems
2985	 * actually since then IP will fill in the address of the route ifn,
2986	 * which means we probably already rejected it.. i.e. here comes an
2987	 * abort :-<.
2988	 */
2989	vrf = sctp_find_vrf(vrf_id);
2990	if (vrf == NULL)
2991		return (NULL);
2992
2993	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2994	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2995	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2996	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2997	if (sctp_ifn == NULL) {
2998		/* ?? We don't have this guy ?? */
2999		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3000		goto bound_all_plan_b;
3001	}
3002	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3003	    ifn_index, sctp_ifn->ifn_name);
3004
3005	if (net) {
3006		cur_addr_num = net->indx_of_eligible_next_to_use;
3007	}
3008	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3009	    inp, stcb,
3010	    non_asoc_addr_ok,
3011	    dest_is_loop,
3012	    dest_is_priv, fam);
3013	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3014	    num_preferred, sctp_ifn->ifn_name);
3015	if (num_preferred == 0) {
3016		/*
3017		 * no eligible addresses, we must use some other interface
3018		 * address if we can find one.
3019		 */
3020		goto bound_all_plan_b;
3021	}
3022	/*
3023	 * Ok we have num_eligible_addr set with how many we can use, this
3024	 * may vary from call to call due to addresses being deprecated
3025	 * etc..
3026	 */
3027	if (cur_addr_num >= num_preferred) {
3028		cur_addr_num = 0;
3029	}
3030	/*
3031	 * select the nth address from the list (where cur_addr_num is the
3032	 * nth) and 0 is the first one, 1 is the second one etc...
3033	 */
3034	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3035
3036	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3037	    dest_is_priv, cur_addr_num, fam, ro);
3038
3039	/* if sctp_ifa is NULL something changed??, fall to plan b. */
3040	if (sctp_ifa) {
3041		atomic_add_int(&sctp_ifa->refcount, 1);
3042		if (net) {
3043			/* save off where the next one we will want */
3044			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3045		}
3046		return (sctp_ifa);
3047	}
3048	/*
3049	 * plan_b: Look at all interfaces and find a preferred address. If
3050	 * no preferred fall through to plan_c.
3051	 */
3052bound_all_plan_b:
3053	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3054	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3055		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3056		    sctp_ifn->ifn_name);
3057		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3058			/* wrong base scope */
3059			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3060			continue;
3061		}
3062		if ((sctp_ifn == looked_at) && looked_at) {
3063			/* already looked at this guy */
3064			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3065			continue;
3066		}
3067		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3068		    dest_is_loop, dest_is_priv, fam);
3069		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070		    "Found ifn:%p %d preferred source addresses\n",
3071		    ifn, num_preferred);
3072		if (num_preferred == 0) {
3073			/* None on this interface. */
3074			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
3075			continue;
3076		}
3077		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079		    num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081		/*
3082		 * Ok we have num_eligible_addr set with how many we can
3083		 * use, this may vary from call to call due to addresses
3084		 * being deprecated etc..
3085		 */
3086		if (cur_addr_num >= num_preferred) {
3087			cur_addr_num = 0;
3088		}
3089		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090		    dest_is_priv, cur_addr_num, fam, ro);
3091		if (sifa == NULL)
3092			continue;
3093		if (net) {
3094			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096			    cur_addr_num);
3097			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101		}
3102		atomic_add_int(&sifa->refcount, 1);
3103		return (sifa);
3104	}
3105#ifdef INET
3106again_with_private_addresses_allowed:
3107#endif
3108	/* plan_c: do we have an acceptable address on the emit interface */
3109	sifa = NULL;
3110	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111	if (emit_ifn == NULL) {
3112		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113		goto plan_d;
3114	}
3115	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117#ifdef INET
3118		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120		    &sctp_ifa->address.sin.sin_addr) != 0)) {
3121			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122			continue;
3123		}
3124#endif
3125#ifdef INET6
3126		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128		    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130			continue;
3131		}
3132#endif
3133		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134		    (non_asoc_addr_ok == 0)) {
3135			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136			continue;
3137		}
3138		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139		    dest_is_priv, fam);
3140		if (sifa == NULL) {
3141			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142			continue;
3143		}
3144		if (stcb) {
3145			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147				sifa = NULL;
3148				continue;
3149			}
3150			if (((non_asoc_addr_ok == 0) &&
3151			    (sctp_is_addr_restricted(stcb, sifa))) ||
3152			    (non_asoc_addr_ok &&
3153			    (sctp_is_addr_restricted(stcb, sifa)) &&
3154			    (!sctp_is_addr_pending(stcb, sifa)))) {
3155				/*
3156				 * It is restricted for some reason..
3157				 * probably not yet added.
3158				 */
3159				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3160				sifa = NULL;
3161				continue;
3162			}
3163		}
3164		atomic_add_int(&sifa->refcount, 1);
3165		goto out;
3166	}
3167plan_d:
3168	/*
3169	 * plan_d: We are in trouble. No preferred address on the emit
3170	 * interface. And not even a preferred address on all interfaces. Go
3171	 * out and see if we can find an acceptable address somewhere
3172	 * amongst all interfaces.
3173	 */
3174	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177			/* wrong base scope */
3178			continue;
3179		}
3180		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181#ifdef INET
3182			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3185				continue;
3186			}
3187#endif
3188#ifdef INET6
3189			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192				continue;
3193			}
3194#endif
3195			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196			    (non_asoc_addr_ok == 0))
3197				continue;
3198			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199			    dest_is_loop,
3200			    dest_is_priv, fam);
3201			if (sifa == NULL)
3202				continue;
3203			if (stcb) {
3204				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205					sifa = NULL;
3206					continue;
3207				}
3208				if (((non_asoc_addr_ok == 0) &&
3209				    (sctp_is_addr_restricted(stcb, sifa))) ||
3210				    (non_asoc_addr_ok &&
3211				    (sctp_is_addr_restricted(stcb, sifa)) &&
3212				    (!sctp_is_addr_pending(stcb, sifa)))) {
3213					/*
3214					 * It is restricted for some
3215					 * reason.. probably not yet added.
3216					 */
3217					sifa = NULL;
3218					continue;
3219				}
3220			}
3221			goto out;
3222		}
3223	}
3224#ifdef INET
3225	if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3226		stcb->asoc.scope.ipv4_local_scope = 1;
3227		retried = 1;
3228		goto again_with_private_addresses_allowed;
3229	} else if (retried == 1) {
3230		stcb->asoc.scope.ipv4_local_scope = 0;
3231	}
3232#endif
3233out:
3234#ifdef INET
3235	if (sifa) {
3236		if (retried == 1) {
3237			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3238				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3239					/* wrong base scope */
3240					continue;
3241				}
3242				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3243					struct sctp_ifa *tmp_sifa;
3244
3245#ifdef INET
3246					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3247					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3248					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3249						continue;
3250					}
3251#endif
3252#ifdef INET6
3253					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3254					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3255					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3256						continue;
3257					}
3258#endif
3259					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3260					    (non_asoc_addr_ok == 0))
3261						continue;
3262					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3263					    dest_is_loop,
3264					    dest_is_priv, fam);
3265					if (tmp_sifa == NULL) {
3266						continue;
3267					}
3268					if (tmp_sifa == sifa) {
3269						continue;
3270					}
3271					if (stcb) {
3272						if (sctp_is_address_in_scope(tmp_sifa,
3273						    &stcb->asoc.scope, 0) == 0) {
3274							continue;
3275						}
3276						if (((non_asoc_addr_ok == 0) &&
3277						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3278						    (non_asoc_addr_ok &&
3279						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3280						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3281							/*
3282							 * It is restricted
3283							 * for some reason..
3284							 * probably not yet
3285							 * added.
3286							 */
3287							continue;
3288						}
3289					}
3290					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3291					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3292						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3293					}
3294				}
3295			}
3296		}
3297		atomic_add_int(&sifa->refcount, 1);
3298	}
3299#endif
3300	return (sifa);
3301}
3302
3303
3304
3305/* tcb may be NULL */
3306struct sctp_ifa *
3307sctp_source_address_selection(struct sctp_inpcb *inp,
3308    struct sctp_tcb *stcb,
3309    sctp_route_t * ro,
3310    struct sctp_nets *net,
3311    int non_asoc_addr_ok, uint32_t vrf_id)
3312{
3313	struct sctp_ifa *answer;
3314	uint8_t dest_is_priv, dest_is_loop;
3315	sa_family_t fam;
3316
3317#ifdef INET
3318	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3319
3320#endif
3321#ifdef INET6
3322	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3323
3324#endif
3325
3326	/**
3327	 * Rules: - Find the route if needed, cache if I can. - Look at
3328	 * interface address in route, Is it in the bound list. If so we
3329	 * have the best source. - If not we must rotate amongst the
3330	 * addresses.
3331	 *
3332	 * Cavets and issues
3333	 *
3334	 * Do we need to pay attention to scope. We can have a private address
3335	 * or a global address we are sourcing or sending to. So if we draw
3336	 * it out
3337	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3338	 * For V4
3339	 * ------------------------------------------
3340	 *      source     *      dest  *  result
3341	 * -----------------------------------------
3342	 * <a>  Private    *    Global  *  NAT
3343	 * -----------------------------------------
3344	 * <b>  Private    *    Private *  No problem
3345	 * -----------------------------------------
3346	 * <c>  Global     *    Private *  Huh, How will this work?
3347	 * -----------------------------------------
3348	 * <d>  Global     *    Global  *  No Problem
3349	 *------------------------------------------
3350	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3351	 * For V6
3352	 *------------------------------------------
3353	 *      source     *      dest  *  result
3354	 * -----------------------------------------
3355	 * <a>  Linklocal  *    Global  *
3356	 * -----------------------------------------
3357	 * <b>  Linklocal  * Linklocal  *  No problem
3358	 * -----------------------------------------
3359	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3360	 * -----------------------------------------
3361	 * <d>  Global     *    Global  *  No Problem
3362	 *------------------------------------------
3363	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3364	 *
3365	 * And then we add to that what happens if there are multiple addresses
3366	 * assigned to an interface. Remember the ifa on a ifn is a linked
3367	 * list of addresses. So one interface can have more than one IP
3368	 * address. What happens if we have both a private and a global
3369	 * address? Do we then use context of destination to sort out which
3370	 * one is best? And what about NAT's sending P->G may get you a NAT
3371	 * translation, or should you select the G thats on the interface in
3372	 * preference.
3373	 *
3374	 * Decisions:
3375	 *
3376	 * - count the number of addresses on the interface.
3377	 * - if it is one, no problem except case <c>.
3378	 *   For <a> we will assume a NAT out there.
3379	 * - if there are more than one, then we need to worry about scope P
3380	 *   or G. We should prefer G -> G and P -> P if possible.
3381	 *   Then as a secondary fall back to mixed types G->P being a last
3382	 *   ditch one.
3383	 * - The above all works for bound all, but bound specific we need to
3384	 *   use the same concept but instead only consider the bound
3385	 *   addresses. If the bound set is NOT assigned to the interface then
3386	 *   we must use rotation amongst the bound addresses..
3387	 */
3388	if (ro->ro_rt == NULL) {
3389		/*
3390		 * Need a route to cache.
3391		 */
3392		SCTP_RTALLOC(ro, vrf_id);
3393	}
3394	if (ro->ro_rt == NULL) {
3395		return (NULL);
3396	}
3397	fam = ro->ro_dst.sa_family;
3398	dest_is_priv = dest_is_loop = 0;
3399	/* Setup our scopes for the destination */
3400	switch (fam) {
3401#ifdef INET
3402	case AF_INET:
3403		/* Scope based on outbound address */
3404		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3405			dest_is_loop = 1;
3406			if (net != NULL) {
3407				/* mark it as local */
3408				net->addr_is_local = 1;
3409			}
3410		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3411			dest_is_priv = 1;
3412		}
3413		break;
3414#endif
3415#ifdef INET6
3416	case AF_INET6:
3417		/* Scope based on outbound address */
3418		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3419		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3420			/*
3421			 * If the address is a loopback address, which
3422			 * consists of "::1" OR "fe80::1%lo0", we are
3423			 * loopback scope. But we don't use dest_is_priv
3424			 * (link local addresses).
3425			 */
3426			dest_is_loop = 1;
3427			if (net != NULL) {
3428				/* mark it as local */
3429				net->addr_is_local = 1;
3430			}
3431		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3432			dest_is_priv = 1;
3433		}
3434		break;
3435#endif
3436	}
3437	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3438	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3439	SCTP_IPI_ADDR_RLOCK();
3440	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3441		/*
3442		 * Bound all case
3443		 */
3444		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3445		    dest_is_priv, dest_is_loop,
3446		    non_asoc_addr_ok, fam);
3447		SCTP_IPI_ADDR_RUNLOCK();
3448		return (answer);
3449	}
3450	/*
3451	 * Subset bound case
3452	 */
3453	if (stcb) {
3454		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3455		    vrf_id, dest_is_priv,
3456		    dest_is_loop,
3457		    non_asoc_addr_ok, fam);
3458	} else {
3459		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3460		    non_asoc_addr_ok,
3461		    dest_is_priv,
3462		    dest_is_loop, fam);
3463	}
3464	SCTP_IPI_ADDR_RUNLOCK();
3465	return (answer);
3466}
3467
3468static int
3469sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3470{
3471	struct cmsghdr cmh;
3472	int tlen, at, found;
3473	struct sctp_sndinfo sndinfo;
3474	struct sctp_prinfo prinfo;
3475	struct sctp_authinfo authinfo;
3476
3477	tlen = SCTP_BUF_LEN(control);
3478	at = 0;
3479	found = 0;
3480	/*
3481	 * Independent of how many mbufs, find the c_type inside the control
3482	 * structure and copy out the data.
3483	 */
3484	while (at < tlen) {
3485		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3486			/* There is not enough room for one more. */
3487			return (found);
3488		}
3489		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3490		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3491			/* We dont't have a complete CMSG header. */
3492			return (found);
3493		}
3494		if (((int)cmh.cmsg_len + at) > tlen) {
3495			/* We don't have the complete CMSG. */
3496			return (found);
3497		}
3498		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3499		    ((c_type == cmh.cmsg_type) ||
3500		    ((c_type == SCTP_SNDRCV) &&
3501		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3502		    (cmh.cmsg_type == SCTP_PRINFO) ||
3503		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3504			if (c_type == cmh.cmsg_type) {
3505				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3506					return (found);
3507				}
3508				/* It is exactly what we want. Copy it out. */
3509				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3510				return (1);
3511			} else {
3512				struct sctp_sndrcvinfo *sndrcvinfo;
3513
3514				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3515				if (found == 0) {
3516					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3517						return (found);
3518					}
3519					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3520				}
3521				switch (cmh.cmsg_type) {
3522				case SCTP_SNDINFO:
3523					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3524						return (found);
3525					}
3526					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3527					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3528					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3529					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3530					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3531					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3532					break;
3533				case SCTP_PRINFO:
3534					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3535						return (found);
3536					}
3537					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3538					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3539						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3540					} else {
3541						sndrcvinfo->sinfo_timetolive = 0;
3542					}
3543					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3544					break;
3545				case SCTP_AUTHINFO:
3546					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3547						return (found);
3548					}
3549					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3550					sndrcvinfo->sinfo_keynumber_valid = 1;
3551					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3552					break;
3553				default:
3554					return (found);
3555				}
3556				found = 1;
3557			}
3558		}
3559		at += CMSG_ALIGN(cmh.cmsg_len);
3560	}
3561	return (found);
3562}
3563
3564static int
3565sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3566{
3567	struct cmsghdr cmh;
3568	int tlen, at;
3569	struct sctp_initmsg initmsg;
3570
3571#ifdef INET
3572	struct sockaddr_in sin;
3573
3574#endif
3575#ifdef INET6
3576	struct sockaddr_in6 sin6;
3577
3578#endif
3579
3580	tlen = SCTP_BUF_LEN(control);
3581	at = 0;
3582	while (at < tlen) {
3583		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3584			/* There is not enough room for one more. */
3585			*error = EINVAL;
3586			return (1);
3587		}
3588		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3589		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3590			/* We dont't have a complete CMSG header. */
3591			*error = EINVAL;
3592			return (1);
3593		}
3594		if (((int)cmh.cmsg_len + at) > tlen) {
3595			/* We don't have the complete CMSG. */
3596			*error = EINVAL;
3597			return (1);
3598		}
3599		if (cmh.cmsg_level == IPPROTO_SCTP) {
3600			switch (cmh.cmsg_type) {
3601			case SCTP_INIT:
3602				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3603					*error = EINVAL;
3604					return (1);
3605				}
3606				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3607				if (initmsg.sinit_max_attempts)
3608					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3609				if (initmsg.sinit_num_ostreams)
3610					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3611				if (initmsg.sinit_max_instreams)
3612					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3613				if (initmsg.sinit_max_init_timeo)
3614					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3615				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3616					struct sctp_stream_out *tmp_str;
3617					unsigned int i;
3618
3619#if defined(SCTP_DETAILED_STR_STATS)
3620					int j;
3621
3622#endif
3623
3624					/* Default is NOT correct */
3625					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3626					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3627					SCTP_TCB_UNLOCK(stcb);
3628					SCTP_MALLOC(tmp_str,
3629					    struct sctp_stream_out *,
3630					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3631					    SCTP_M_STRMO);
3632					SCTP_TCB_LOCK(stcb);
3633					if (tmp_str != NULL) {
3634						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3635						stcb->asoc.strmout = tmp_str;
3636						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3637					} else {
3638						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3639					}
3640					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3641						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3642						stcb->asoc.strmout[i].chunks_on_queues = 0;
3643						stcb->asoc.strmout[i].next_sequence_send = 0;
3644#if defined(SCTP_DETAILED_STR_STATS)
3645						for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3646							stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3647							stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3648						}
3649#else
3650						stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3651						stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3652#endif
3653						stcb->asoc.strmout[i].stream_no = i;
3654						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3655						stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3656					}
3657				}
3658				break;
3659#ifdef INET
3660			case SCTP_DSTADDRV4:
3661				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3662					*error = EINVAL;
3663					return (1);
3664				}
3665				memset(&sin, 0, sizeof(struct sockaddr_in));
3666				sin.sin_family = AF_INET;
3667				sin.sin_len = sizeof(struct sockaddr_in);
3668				sin.sin_port = stcb->rport;
3669				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3670				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3671				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3672				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3673					*error = EINVAL;
3674					return (1);
3675				}
3676				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3677				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3678					*error = ENOBUFS;
3679					return (1);
3680				}
3681				break;
3682#endif
3683#ifdef INET6
3684			case SCTP_DSTADDRV6:
3685				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3686					*error = EINVAL;
3687					return (1);
3688				}
3689				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3690				sin6.sin6_family = AF_INET6;
3691				sin6.sin6_len = sizeof(struct sockaddr_in6);
3692				sin6.sin6_port = stcb->rport;
3693				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3694				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3695				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3696					*error = EINVAL;
3697					return (1);
3698				}
3699#ifdef INET
3700				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3701					in6_sin6_2_sin(&sin, &sin6);
3702					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3703					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3704					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3705						*error = EINVAL;
3706						return (1);
3707					}
3708					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3709					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710						*error = ENOBUFS;
3711						return (1);
3712					}
3713				} else
3714#endif
3715					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3716				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3717					*error = ENOBUFS;
3718					return (1);
3719				}
3720				break;
3721#endif
3722			default:
3723				break;
3724			}
3725		}
3726		at += CMSG_ALIGN(cmh.cmsg_len);
3727	}
3728	return (0);
3729}
3730
3731static struct sctp_tcb *
3732sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3733    uint16_t port,
3734    struct mbuf *control,
3735    struct sctp_nets **net_p,
3736    int *error)
3737{
3738	struct cmsghdr cmh;
3739	int tlen, at;
3740	struct sctp_tcb *stcb;
3741	struct sockaddr *addr;
3742
3743#ifdef INET
3744	struct sockaddr_in sin;
3745
3746#endif
3747#ifdef INET6
3748	struct sockaddr_in6 sin6;
3749
3750#endif
3751
3752	tlen = SCTP_BUF_LEN(control);
3753	at = 0;
3754	while (at < tlen) {
3755		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3756			/* There is not enough room for one more. */
3757			*error = EINVAL;
3758			return (NULL);
3759		}
3760		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3761		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3762			/* We dont't have a complete CMSG header. */
3763			*error = EINVAL;
3764			return (NULL);
3765		}
3766		if (((int)cmh.cmsg_len + at) > tlen) {
3767			/* We don't have the complete CMSG. */
3768			*error = EINVAL;
3769			return (NULL);
3770		}
3771		if (cmh.cmsg_level == IPPROTO_SCTP) {
3772			switch (cmh.cmsg_type) {
3773#ifdef INET
3774			case SCTP_DSTADDRV4:
3775				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3776					*error = EINVAL;
3777					return (NULL);
3778				}
3779				memset(&sin, 0, sizeof(struct sockaddr_in));
3780				sin.sin_family = AF_INET;
3781				sin.sin_len = sizeof(struct sockaddr_in);
3782				sin.sin_port = port;
3783				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3784				addr = (struct sockaddr *)&sin;
3785				break;
3786#endif
3787#ifdef INET6
3788			case SCTP_DSTADDRV6:
3789				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3790					*error = EINVAL;
3791					return (NULL);
3792				}
3793				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3794				sin6.sin6_family = AF_INET6;
3795				sin6.sin6_len = sizeof(struct sockaddr_in6);
3796				sin6.sin6_port = port;
3797				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3798#ifdef INET
3799				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3800					in6_sin6_2_sin(&sin, &sin6);
3801					addr = (struct sockaddr *)&sin;
3802				} else
3803#endif
3804					addr = (struct sockaddr *)&sin6;
3805				break;
3806#endif
3807			default:
3808				addr = NULL;
3809				break;
3810			}
3811			if (addr) {
3812				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3813				if (stcb != NULL) {
3814					return (stcb);
3815				}
3816			}
3817		}
3818		at += CMSG_ALIGN(cmh.cmsg_len);
3819	}
3820	return (NULL);
3821}
3822
3823static struct mbuf *
3824sctp_add_cookie(struct mbuf *init, int init_offset,
3825    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3826{
3827	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3828	struct sctp_state_cookie *stc;
3829	struct sctp_paramhdr *ph;
3830	uint8_t *foo;
3831	int sig_offset;
3832	uint16_t cookie_sz;
3833
3834	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3835	    sizeof(struct sctp_paramhdr)), 0,
3836	    M_NOWAIT, 1, MT_DATA);
3837	if (mret == NULL) {
3838		return (NULL);
3839	}
3840	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3841	if (copy_init == NULL) {
3842		sctp_m_freem(mret);
3843		return (NULL);
3844	}
3845#ifdef SCTP_MBUF_LOGGING
3846	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3847		sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3848	}
3849#endif
3850	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3851	    M_NOWAIT);
3852	if (copy_initack == NULL) {
3853		sctp_m_freem(mret);
3854		sctp_m_freem(copy_init);
3855		return (NULL);
3856	}
3857#ifdef SCTP_MBUF_LOGGING
3858	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3859		sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3860	}
3861#endif
3862	/* easy side we just drop it on the end */
3863	ph = mtod(mret, struct sctp_paramhdr *);
3864	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3865	    sizeof(struct sctp_paramhdr);
3866	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3867	    sizeof(struct sctp_paramhdr));
3868	ph->param_type = htons(SCTP_STATE_COOKIE);
3869	ph->param_length = 0;	/* fill in at the end */
3870	/* Fill in the stc cookie data */
3871	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3872
3873	/* tack the INIT and then the INIT-ACK onto the chain */
3874	cookie_sz = 0;
3875	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876		cookie_sz += SCTP_BUF_LEN(m_at);
3877		if (SCTP_BUF_NEXT(m_at) == NULL) {
3878			SCTP_BUF_NEXT(m_at) = copy_init;
3879			break;
3880		}
3881	}
3882	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3883		cookie_sz += SCTP_BUF_LEN(m_at);
3884		if (SCTP_BUF_NEXT(m_at) == NULL) {
3885			SCTP_BUF_NEXT(m_at) = copy_initack;
3886			break;
3887		}
3888	}
3889	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890		cookie_sz += SCTP_BUF_LEN(m_at);
3891		if (SCTP_BUF_NEXT(m_at) == NULL) {
3892			break;
3893		}
3894	}
3895	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3896	if (sig == NULL) {
3897		/* no space, so free the entire chain */
3898		sctp_m_freem(mret);
3899		return (NULL);
3900	}
3901	SCTP_BUF_LEN(sig) = 0;
3902	SCTP_BUF_NEXT(m_at) = sig;
3903	sig_offset = 0;
3904	foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3905	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3906	*signature = foo;
3907	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3908	cookie_sz += SCTP_SIGNATURE_SIZE;
3909	ph->param_length = htons(cookie_sz);
3910	return (mret);
3911}
3912
3913
3914static uint8_t
3915sctp_get_ect(struct sctp_tcb *stcb)
3916{
3917	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3918		return (SCTP_ECT0_BIT);
3919	} else {
3920		return (0);
3921	}
3922}
3923
3924#if defined(INET) || defined(INET6)
3925static void
3926sctp_handle_no_route(struct sctp_tcb *stcb,
3927    struct sctp_nets *net,
3928    int so_locked)
3929{
3930	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3931
3932	if (net) {
3933		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3934		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3935		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3936			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3937				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3938				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3939				    stcb, 0,
3940				    (void *)net,
3941				    so_locked);
3942				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3943				net->dest_state &= ~SCTP_ADDR_PF;
3944			}
3945		}
3946		if (stcb) {
3947			if (net == stcb->asoc.primary_destination) {
3948				/* need a new primary */
3949				struct sctp_nets *alt;
3950
3951				alt = sctp_find_alternate_net(stcb, net, 0);
3952				if (alt != net) {
3953					if (stcb->asoc.alternate) {
3954						sctp_free_remote_addr(stcb->asoc.alternate);
3955					}
3956					stcb->asoc.alternate = alt;
3957					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3958					if (net->ro._s_addr) {
3959						sctp_free_ifa(net->ro._s_addr);
3960						net->ro._s_addr = NULL;
3961					}
3962					net->src_addr_selected = 0;
3963				}
3964			}
3965		}
3966	}
3967}
3968
3969#endif
3970
3971static int
3972sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3973    struct sctp_tcb *stcb,	/* may be NULL */
3974    struct sctp_nets *net,
3975    struct sockaddr *to,
3976    struct mbuf *m,
3977    uint32_t auth_offset,
3978    struct sctp_auth_chunk *auth,
3979    uint16_t auth_keyid,
3980    int nofragment_flag,
3981    int ecn_ok,
3982    int out_of_asoc_ok,
3983    uint16_t src_port,
3984    uint16_t dest_port,
3985    uint32_t v_tag,
3986    uint16_t port,
3987    union sctp_sockstore *over_addr,
3988    uint8_t mflowtype, uint32_t mflowid,
3989#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3990    int so_locked SCTP_UNUSED
3991#else
3992    int so_locked
3993#endif
3994)
3995/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3996{
3997	/**
3998	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3999	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4000	 * - fill in the HMAC digest of any AUTH chunk in the packet.
4001	 * - calculate and fill in the SCTP checksum.
4002	 * - prepend an IP address header.
4003	 * - if boundall use INADDR_ANY.
4004	 * - if boundspecific do source address selection.
4005	 * - set fragmentation option for ipV4.
4006	 * - On return from IP output, check/adjust mtu size of output
4007	 *   interface and smallest_mtu size as well.
4008	 */
4009	/* Will need ifdefs around this */
4010	struct mbuf *newm;
4011	struct sctphdr *sctphdr;
4012	int packet_length;
4013	int ret;
4014
4015#if defined(INET) || defined(INET6)
4016	uint32_t vrf_id;
4017
4018#endif
4019#if defined(INET) || defined(INET6)
4020	struct mbuf *o_pak;
4021	sctp_route_t *ro = NULL;
4022	struct udphdr *udp = NULL;
4023
4024#endif
4025	uint8_t tos_value;
4026
4027#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028	struct socket *so = NULL;
4029
4030#endif
4031
4032	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4033		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4034		sctp_m_freem(m);
4035		return (EFAULT);
4036	}
4037#if defined(INET) || defined(INET6)
4038	if (stcb) {
4039		vrf_id = stcb->asoc.vrf_id;
4040	} else {
4041		vrf_id = inp->def_vrf_id;
4042	}
4043#endif
4044	/* fill in the HMAC digest for any AUTH chunk in the packet */
4045	if ((auth != NULL) && (stcb != NULL)) {
4046		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4047	}
4048	if (net) {
4049		tos_value = net->dscp;
4050	} else if (stcb) {
4051		tos_value = stcb->asoc.default_dscp;
4052	} else {
4053		tos_value = inp->sctp_ep.default_dscp;
4054	}
4055
4056	switch (to->sa_family) {
4057#ifdef INET
4058	case AF_INET:
4059		{
4060			struct ip *ip = NULL;
4061			sctp_route_t iproute;
4062			int len;
4063
4064			len = SCTP_MIN_V4_OVERHEAD;
4065			if (port) {
4066				len += sizeof(struct udphdr);
4067			}
4068			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069			if (newm == NULL) {
4070				sctp_m_freem(m);
4071				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072				return (ENOMEM);
4073			}
4074			SCTP_ALIGN_TO_END(newm, len);
4075			SCTP_BUF_LEN(newm) = len;
4076			SCTP_BUF_NEXT(newm) = m;
4077			m = newm;
4078			if (net != NULL) {
4079				m->m_pkthdr.flowid = net->flowid;
4080				M_HASHTYPE_SET(m, net->flowtype);
4081			} else {
4082				m->m_pkthdr.flowid = mflowid;
4083				M_HASHTYPE_SET(m, mflowtype);
4084			}
4085			packet_length = sctp_calculate_len(m);
4086			ip = mtod(m, struct ip *);
4087			ip->ip_v = IPVERSION;
4088			ip->ip_hl = (sizeof(struct ip) >> 2);
4089			if (tos_value == 0) {
4090				/*
4091				 * This means especially, that it is not set
4092				 * at the SCTP layer. So use the value from
4093				 * the IP layer.
4094				 */
4095				tos_value = inp->ip_inp.inp.inp_ip_tos;
4096			}
4097			tos_value &= 0xfc;
4098			if (ecn_ok) {
4099				tos_value |= sctp_get_ect(stcb);
4100			}
4101			if ((nofragment_flag) && (port == 0)) {
4102				ip->ip_off = htons(IP_DF);
4103			} else {
4104				ip->ip_off = htons(0);
4105			}
4106			/* FreeBSD has a function for ip_id's */
4107			ip->ip_id = ip_newid();
4108
4109			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4110			ip->ip_len = htons(packet_length);
4111			ip->ip_tos = tos_value;
4112			if (port) {
4113				ip->ip_p = IPPROTO_UDP;
4114			} else {
4115				ip->ip_p = IPPROTO_SCTP;
4116			}
4117			ip->ip_sum = 0;
4118			if (net == NULL) {
4119				ro = &iproute;
4120				memset(&iproute, 0, sizeof(iproute));
4121				memcpy(&ro->ro_dst, to, to->sa_len);
4122			} else {
4123				ro = (sctp_route_t *) & net->ro;
4124			}
4125			/* Now the address selection part */
4126			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4127
4128			/* call the routine to select the src address */
4129			if (net && out_of_asoc_ok == 0) {
4130				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4131					sctp_free_ifa(net->ro._s_addr);
4132					net->ro._s_addr = NULL;
4133					net->src_addr_selected = 0;
4134					if (ro->ro_rt) {
4135						RTFREE(ro->ro_rt);
4136						ro->ro_rt = NULL;
4137					}
4138				}
4139				if (net->src_addr_selected == 0) {
4140					/* Cache the source address */
4141					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4142					    ro, net, 0,
4143					    vrf_id);
4144					net->src_addr_selected = 1;
4145				}
4146				if (net->ro._s_addr == NULL) {
4147					/* No route to host */
4148					net->src_addr_selected = 0;
4149					sctp_handle_no_route(stcb, net, so_locked);
4150					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4151					sctp_m_freem(m);
4152					return (EHOSTUNREACH);
4153				}
4154				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4155			} else {
4156				if (over_addr == NULL) {
4157					struct sctp_ifa *_lsrc;
4158
4159					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4160					    net,
4161					    out_of_asoc_ok,
4162					    vrf_id);
4163					if (_lsrc == NULL) {
4164						sctp_handle_no_route(stcb, net, so_locked);
4165						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4166						sctp_m_freem(m);
4167						return (EHOSTUNREACH);
4168					}
4169					ip->ip_src = _lsrc->address.sin.sin_addr;
4170					sctp_free_ifa(_lsrc);
4171				} else {
4172					ip->ip_src = over_addr->sin.sin_addr;
4173					SCTP_RTALLOC(ro, vrf_id);
4174				}
4175			}
4176			if (port) {
4177				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4178					sctp_handle_no_route(stcb, net, so_locked);
4179					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4180					sctp_m_freem(m);
4181					return (EHOSTUNREACH);
4182				}
4183				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4184				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4185				udp->uh_dport = port;
4186				udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4187				if (V_udp_cksum) {
4188					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4189				} else {
4190					udp->uh_sum = 0;
4191				}
4192				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4193			} else {
4194				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4195			}
4196
4197			sctphdr->src_port = src_port;
4198			sctphdr->dest_port = dest_port;
4199			sctphdr->v_tag = v_tag;
4200			sctphdr->checksum = 0;
4201
4202			/*
4203			 * If source address selection fails and we find no
4204			 * route then the ip_output should fail as well with
4205			 * a NO_ROUTE_TO_HOST type error. We probably should
4206			 * catch that somewhere and abort the association
4207			 * right away (assuming this is an INIT being sent).
4208			 */
4209			if (ro->ro_rt == NULL) {
4210				/*
4211				 * src addr selection failed to find a route
4212				 * (or valid source addr), so we can't get
4213				 * there from here (yet)!
4214				 */
4215				sctp_handle_no_route(stcb, net, so_locked);
4216				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4217				sctp_m_freem(m);
4218				return (EHOSTUNREACH);
4219			}
4220			if (ro != &iproute) {
4221				memcpy(&iproute, ro, sizeof(*ro));
4222			}
4223			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4224			    (uint32_t) (ntohl(ip->ip_src.s_addr)));
4225			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4226			    (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4227			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4228			    (void *)ro->ro_rt);
4229
4230			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4231				/* failed to prepend data, give up */
4232				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4233				sctp_m_freem(m);
4234				return (ENOMEM);
4235			}
4236			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4237			if (port) {
4238#if defined(SCTP_WITH_NO_CSUM)
4239				SCTP_STAT_INCR(sctps_sendnocrc);
4240#else
4241				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4242				SCTP_STAT_INCR(sctps_sendswcrc);
4243#endif
4244				if (V_udp_cksum) {
4245					SCTP_ENABLE_UDP_CSUM(o_pak);
4246				}
4247			} else {
4248#if defined(SCTP_WITH_NO_CSUM)
4249				SCTP_STAT_INCR(sctps_sendnocrc);
4250#else
4251				m->m_pkthdr.csum_flags = CSUM_SCTP;
4252				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4253				SCTP_STAT_INCR(sctps_sendhwcrc);
4254#endif
4255			}
4256#ifdef SCTP_PACKET_LOGGING
4257			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4258				sctp_packet_log(o_pak);
4259#endif
4260			/* send it out.  table id is taken from stcb */
4261#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4262			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4263				so = SCTP_INP_SO(inp);
4264				SCTP_SOCKET_UNLOCK(so, 0);
4265			}
4266#endif
4267			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4268#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4269			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4270				atomic_add_int(&stcb->asoc.refcnt, 1);
4271				SCTP_TCB_UNLOCK(stcb);
4272				SCTP_SOCKET_LOCK(so, 0);
4273				SCTP_TCB_LOCK(stcb);
4274				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4275			}
4276#endif
4277			SCTP_STAT_INCR(sctps_sendpackets);
4278			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4279			if (ret)
4280				SCTP_STAT_INCR(sctps_senderrors);
4281
4282			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4283			if (net == NULL) {
4284				/* free tempy routes */
4285				RO_RTFREE(ro);
4286			} else {
4287				/*
4288				 * PMTU check versus smallest asoc MTU goes
4289				 * here
4290				 */
4291				if ((ro->ro_rt != NULL) &&
4292				    (net->ro._s_addr)) {
4293					uint32_t mtu;
4294
4295					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4296					if (net->port) {
4297						mtu -= sizeof(struct udphdr);
4298					}
4299					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4300						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4301						net->mtu = mtu;
4302					}
4303				} else if (ro->ro_rt == NULL) {
4304					/* route was freed */
4305					if (net->ro._s_addr &&
4306					    net->src_addr_selected) {
4307						sctp_free_ifa(net->ro._s_addr);
4308						net->ro._s_addr = NULL;
4309					}
4310					net->src_addr_selected = 0;
4311				}
4312			}
4313			return (ret);
4314		}
4315#endif
4316#ifdef INET6
4317	case AF_INET6:
4318		{
4319			uint32_t flowlabel, flowinfo;
4320			struct ip6_hdr *ip6h;
4321			struct route_in6 ip6route;
4322			struct ifnet *ifp;
4323			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4324			int prev_scope = 0;
4325			struct sockaddr_in6 lsa6_storage;
4326			int error;
4327			u_short prev_port = 0;
4328			int len;
4329
4330			if (net) {
4331				flowlabel = net->flowlabel;
4332			} else if (stcb) {
4333				flowlabel = stcb->asoc.default_flowlabel;
4334			} else {
4335				flowlabel = inp->sctp_ep.default_flowlabel;
4336			}
4337			if (flowlabel == 0) {
4338				/*
4339				 * This means especially, that it is not set
4340				 * at the SCTP layer. So use the value from
4341				 * the IP layer.
4342				 */
4343				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4344			}
4345			flowlabel &= 0x000fffff;
4346			len = SCTP_MIN_OVERHEAD;
4347			if (port) {
4348				len += sizeof(struct udphdr);
4349			}
4350			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4351			if (newm == NULL) {
4352				sctp_m_freem(m);
4353				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4354				return (ENOMEM);
4355			}
4356			SCTP_ALIGN_TO_END(newm, len);
4357			SCTP_BUF_LEN(newm) = len;
4358			SCTP_BUF_NEXT(newm) = m;
4359			m = newm;
4360			if (net != NULL) {
4361				m->m_pkthdr.flowid = net->flowid;
4362				M_HASHTYPE_SET(m, net->flowtype);
4363			} else {
4364				m->m_pkthdr.flowid = mflowid;
4365				M_HASHTYPE_SET(m, mflowtype);
4366			}
4367			packet_length = sctp_calculate_len(m);
4368
4369			ip6h = mtod(m, struct ip6_hdr *);
4370			/* protect *sin6 from overwrite */
4371			sin6 = (struct sockaddr_in6 *)to;
4372			tmp = *sin6;
4373			sin6 = &tmp;
4374
4375			/* KAME hack: embed scopeid */
4376			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4377				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4378				return (EINVAL);
4379			}
4380			if (net == NULL) {
4381				memset(&ip6route, 0, sizeof(ip6route));
4382				ro = (sctp_route_t *) & ip6route;
4383				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4384			} else {
4385				ro = (sctp_route_t *) & net->ro;
4386			}
4387			/*
4388			 * We assume here that inp_flow is in host byte
4389			 * order within the TCB!
4390			 */
4391			if (tos_value == 0) {
4392				/*
4393				 * This means especially, that it is not set
4394				 * at the SCTP layer. So use the value from
4395				 * the IP layer.
4396				 */
4397				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4398			}
4399			tos_value &= 0xfc;
4400			if (ecn_ok) {
4401				tos_value |= sctp_get_ect(stcb);
4402			}
4403			flowinfo = 0x06;
4404			flowinfo <<= 8;
4405			flowinfo |= tos_value;
4406			flowinfo <<= 20;
4407			flowinfo |= flowlabel;
4408			ip6h->ip6_flow = htonl(flowinfo);
4409			if (port) {
4410				ip6h->ip6_nxt = IPPROTO_UDP;
4411			} else {
4412				ip6h->ip6_nxt = IPPROTO_SCTP;
4413			}
4414			ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4415			ip6h->ip6_dst = sin6->sin6_addr;
4416
4417			/*
4418			 * Add SRC address selection here: we can only reuse
4419			 * to a limited degree the kame src-addr-sel, since
4420			 * we can try their selection but it may not be
4421			 * bound.
4422			 */
4423			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4424			lsa6_tmp.sin6_family = AF_INET6;
4425			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4426			lsa6 = &lsa6_tmp;
4427			if (net && out_of_asoc_ok == 0) {
4428				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4429					sctp_free_ifa(net->ro._s_addr);
4430					net->ro._s_addr = NULL;
4431					net->src_addr_selected = 0;
4432					if (ro->ro_rt) {
4433						RTFREE(ro->ro_rt);
4434						ro->ro_rt = NULL;
4435					}
4436				}
4437				if (net->src_addr_selected == 0) {
4438					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4439					/* KAME hack: embed scopeid */
4440					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4441						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4442						return (EINVAL);
4443					}
4444					/* Cache the source address */
4445					net->ro._s_addr = sctp_source_address_selection(inp,
4446					    stcb,
4447					    ro,
4448					    net,
4449					    0,
4450					    vrf_id);
4451					(void)sa6_recoverscope(sin6);
4452					net->src_addr_selected = 1;
4453				}
4454				if (net->ro._s_addr == NULL) {
4455					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4456					net->src_addr_selected = 0;
4457					sctp_handle_no_route(stcb, net, so_locked);
4458					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4459					sctp_m_freem(m);
4460					return (EHOSTUNREACH);
4461				}
4462				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4463			} else {
4464				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4465				/* KAME hack: embed scopeid */
4466				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4467					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4468					return (EINVAL);
4469				}
4470				if (over_addr == NULL) {
4471					struct sctp_ifa *_lsrc;
4472
4473					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4474					    net,
4475					    out_of_asoc_ok,
4476					    vrf_id);
4477					if (_lsrc == NULL) {
4478						sctp_handle_no_route(stcb, net, so_locked);
4479						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4480						sctp_m_freem(m);
4481						return (EHOSTUNREACH);
4482					}
4483					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4484					sctp_free_ifa(_lsrc);
4485				} else {
4486					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4487					SCTP_RTALLOC(ro, vrf_id);
4488				}
4489				(void)sa6_recoverscope(sin6);
4490			}
4491			lsa6->sin6_port = inp->sctp_lport;
4492
4493			if (ro->ro_rt == NULL) {
4494				/*
4495				 * src addr selection failed to find a route
4496				 * (or valid source addr), so we can't get
4497				 * there from here!
4498				 */
4499				sctp_handle_no_route(stcb, net, so_locked);
4500				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4501				sctp_m_freem(m);
4502				return (EHOSTUNREACH);
4503			}
4504			/*
4505			 * XXX: sa6 may not have a valid sin6_scope_id in
4506			 * the non-SCOPEDROUTING case.
4507			 */
4508			bzero(&lsa6_storage, sizeof(lsa6_storage));
4509			lsa6_storage.sin6_family = AF_INET6;
4510			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4511			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4512			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4513				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4514				sctp_m_freem(m);
4515				return (error);
4516			}
4517			/* XXX */
4518			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4519			lsa6_storage.sin6_port = inp->sctp_lport;
4520			lsa6 = &lsa6_storage;
4521			ip6h->ip6_src = lsa6->sin6_addr;
4522
4523			if (port) {
4524				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4525					sctp_handle_no_route(stcb, net, so_locked);
4526					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4527					sctp_m_freem(m);
4528					return (EHOSTUNREACH);
4529				}
4530				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4531				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4532				udp->uh_dport = port;
4533				udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4534				udp->uh_sum = 0;
4535				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4536			} else {
4537				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4538			}
4539
4540			sctphdr->src_port = src_port;
4541			sctphdr->dest_port = dest_port;
4542			sctphdr->v_tag = v_tag;
4543			sctphdr->checksum = 0;
4544
4545			/*
4546			 * We set the hop limit now since there is a good
4547			 * chance that our ro pointer is now filled
4548			 */
4549			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4550			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4551
4552#ifdef SCTP_DEBUG
4553			/* Copy to be sure something bad is not happening */
4554			sin6->sin6_addr = ip6h->ip6_dst;
4555			lsa6->sin6_addr = ip6h->ip6_src;
4556#endif
4557
4558			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4559			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4560			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4561			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4562			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4563			if (net) {
4564				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4565				/*
4566				 * preserve the port and scope for link
4567				 * local send
4568				 */
4569				prev_scope = sin6->sin6_scope_id;
4570				prev_port = sin6->sin6_port;
4571			}
4572			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4573				/* failed to prepend data, give up */
4574				sctp_m_freem(m);
4575				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4576				return (ENOMEM);
4577			}
4578			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4579			if (port) {
4580#if defined(SCTP_WITH_NO_CSUM)
4581				SCTP_STAT_INCR(sctps_sendnocrc);
4582#else
4583				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4584				SCTP_STAT_INCR(sctps_sendswcrc);
4585#endif
4586				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4587					udp->uh_sum = 0xffff;
4588				}
4589			} else {
4590#if defined(SCTP_WITH_NO_CSUM)
4591				SCTP_STAT_INCR(sctps_sendnocrc);
4592#else
4593				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4594				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4595				SCTP_STAT_INCR(sctps_sendhwcrc);
4596#endif
4597			}
4598			/* send it out. table id is taken from stcb */
4599#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4600			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4601				so = SCTP_INP_SO(inp);
4602				SCTP_SOCKET_UNLOCK(so, 0);
4603			}
4604#endif
4605#ifdef SCTP_PACKET_LOGGING
4606			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4607				sctp_packet_log(o_pak);
4608#endif
4609			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4610#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4611			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4612				atomic_add_int(&stcb->asoc.refcnt, 1);
4613				SCTP_TCB_UNLOCK(stcb);
4614				SCTP_SOCKET_LOCK(so, 0);
4615				SCTP_TCB_LOCK(stcb);
4616				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4617			}
4618#endif
4619			if (net) {
4620				/* for link local this must be done */
4621				sin6->sin6_scope_id = prev_scope;
4622				sin6->sin6_port = prev_port;
4623			}
4624			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4625			SCTP_STAT_INCR(sctps_sendpackets);
4626			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4627			if (ret) {
4628				SCTP_STAT_INCR(sctps_senderrors);
4629			}
4630			if (net == NULL) {
4631				/* Now if we had a temp route free it */
4632				RO_RTFREE(ro);
4633			} else {
4634				/*
4635				 * PMTU check versus smallest asoc MTU goes
4636				 * here
4637				 */
4638				if (ro->ro_rt == NULL) {
4639					/* Route was freed */
4640					if (net->ro._s_addr &&
4641					    net->src_addr_selected) {
4642						sctp_free_ifa(net->ro._s_addr);
4643						net->ro._s_addr = NULL;
4644					}
4645					net->src_addr_selected = 0;
4646				}
4647				if ((ro->ro_rt != NULL) &&
4648				    (net->ro._s_addr)) {
4649					uint32_t mtu;
4650
4651					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4652					if (mtu &&
4653					    (stcb->asoc.smallest_mtu > mtu)) {
4654						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4655						net->mtu = mtu;
4656						if (net->port) {
4657							net->mtu -= sizeof(struct udphdr);
4658						}
4659					}
4660				} else if (ifp) {
4661					if (ND_IFINFO(ifp)->linkmtu &&
4662					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4663						sctp_mtu_size_reset(inp,
4664						    &stcb->asoc,
4665						    ND_IFINFO(ifp)->linkmtu);
4666					}
4667				}
4668			}
4669			return (ret);
4670		}
4671#endif
4672	default:
4673		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4674		    ((struct sockaddr *)to)->sa_family);
4675		sctp_m_freem(m);
4676		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4677		return (EFAULT);
4678	}
4679}
4680
4681
4682void
4683sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4684#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4685    SCTP_UNUSED
4686#endif
4687)
4688{
4689	struct mbuf *m, *m_last;
4690	struct sctp_nets *net;
4691	struct sctp_init_chunk *init;
4692	struct sctp_supported_addr_param *sup_addr;
4693	struct sctp_adaptation_layer_indication *ali;
4694	struct sctp_supported_chunk_types_param *pr_supported;
4695	struct sctp_paramhdr *ph;
4696	int cnt_inits_to = 0;
4697	int ret;
4698	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4699
4700	/* INIT's always go to the primary (and usually ONLY address) */
4701	net = stcb->asoc.primary_destination;
4702	if (net == NULL) {
4703		net = TAILQ_FIRST(&stcb->asoc.nets);
4704		if (net == NULL) {
4705			/* TSNH */
4706			return;
4707		}
4708		/* we confirm any address we send an INIT to */
4709		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4710		(void)sctp_set_primary_addr(stcb, NULL, net);
4711	} else {
4712		/* we confirm any address we send an INIT to */
4713		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4714	}
4715	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4716#ifdef INET6
4717	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4718		/*
4719		 * special hook, if we are sending to link local it will not
4720		 * show up in our private address count.
4721		 */
4722		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4723			cnt_inits_to = 1;
4724	}
4725#endif
4726	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4727		/* This case should not happen */
4728		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4729		return;
4730	}
4731	/* start the INIT timer */
4732	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4733
4734	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4735	if (m == NULL) {
4736		/* No memory, INIT timer will re-attempt. */
4737		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4738		return;
4739	}
4740	chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4741	padding_len = 0;
4742	/* Now lets put the chunk header in place */
4743	init = mtod(m, struct sctp_init_chunk *);
4744	/* now the chunk header */
4745	init->ch.chunk_type = SCTP_INITIATION;
4746	init->ch.chunk_flags = 0;
4747	/* fill in later from mbuf we build */
4748	init->ch.chunk_length = 0;
4749	/* place in my tag */
4750	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4751	/* set up some of the credits. */
4752	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4753	    SCTP_MINIMAL_RWND));
4754	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4755	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4756	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4757
4758	/* Adaptation layer indication parameter */
4759	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4760		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4761		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4762		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4763		ali->ph.param_length = htons(parameter_len);
4764		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4765		chunk_len += parameter_len;
4766	}
4767	/* ECN parameter */
4768	if (stcb->asoc.ecn_supported == 1) {
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_ECN_CAPABLE);
4772		ph->param_length = htons(parameter_len);
4773		chunk_len += parameter_len;
4774	}
4775	/* PR-SCTP supported parameter */
4776	if (stcb->asoc.prsctp_supported == 1) {
4777		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4778		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4779		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4780		ph->param_length = htons(parameter_len);
4781		chunk_len += parameter_len;
4782	}
4783	/* Add NAT friendly parameter. */
4784	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4785		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4786		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4787		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4788		ph->param_length = htons(parameter_len);
4789		chunk_len += parameter_len;
4790	}
4791	/* And now tell the peer which extensions we support */
4792	num_ext = 0;
4793	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4794	if (stcb->asoc.prsctp_supported == 1) {
4795		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4796	}
4797	if (stcb->asoc.auth_supported == 1) {
4798		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4799	}
4800	if (stcb->asoc.asconf_supported == 1) {
4801		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4802		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4803	}
4804	if (stcb->asoc.reconfig_supported == 1) {
4805		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4806	}
4807	if (stcb->asoc.nrsack_supported == 1) {
4808		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4809	}
4810	if (stcb->asoc.pktdrop_supported == 1) {
4811		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4812	}
4813	if (num_ext > 0) {
4814		parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4815		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4816		pr_supported->ph.param_length = htons(parameter_len);
4817		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4818		chunk_len += parameter_len;
4819	}
4820	/* add authentication parameters */
4821	if (stcb->asoc.auth_supported) {
4822		/* attach RANDOM parameter, if available */
4823		if (stcb->asoc.authinfo.random != NULL) {
4824			struct sctp_auth_random *randp;
4825
4826			if (padding_len > 0) {
4827				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4828				chunk_len += padding_len;
4829				padding_len = 0;
4830			}
4831			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4832			parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4833			/* random key already contains the header */
4834			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4835			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4836			chunk_len += parameter_len;
4837		}
4838		/* add HMAC_ALGO parameter */
4839		if (stcb->asoc.local_hmacs != NULL) {
4840			struct sctp_auth_hmac_algo *hmacs;
4841
4842			if (padding_len > 0) {
4843				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4844				chunk_len += padding_len;
4845				padding_len = 0;
4846			}
4847			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4848			parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4849			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4850			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4851			hmacs->ph.param_length = htons(parameter_len);
4852			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4853			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4854			chunk_len += parameter_len;
4855		}
4856		/* add CHUNKS parameter */
4857		if (stcb->asoc.local_auth_chunks != NULL) {
4858			struct sctp_auth_chunk_list *chunks;
4859
4860			if (padding_len > 0) {
4861				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4862				chunk_len += padding_len;
4863				padding_len = 0;
4864			}
4865			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4866			parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4867			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4868			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4869			chunks->ph.param_length = htons(parameter_len);
4870			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4871			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4872			chunk_len += parameter_len;
4873		}
4874	}
4875	/* now any cookie time extensions */
4876	if (stcb->asoc.cookie_preserve_req) {
4877		struct sctp_cookie_perserve_param *cookie_preserve;
4878
4879		if (padding_len > 0) {
4880			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4881			chunk_len += padding_len;
4882			padding_len = 0;
4883		}
4884		parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4885		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4886		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4887		cookie_preserve->ph.param_length = htons(parameter_len);
4888		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4889		stcb->asoc.cookie_preserve_req = 0;
4890		chunk_len += parameter_len;
4891	}
4892	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4893		uint8_t i;
4894
4895		if (padding_len > 0) {
4896			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4897			chunk_len += padding_len;
4898			padding_len = 0;
4899		}
4900		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4901		if (stcb->asoc.scope.ipv4_addr_legal) {
4902			parameter_len += (uint16_t) sizeof(uint16_t);
4903		}
4904		if (stcb->asoc.scope.ipv6_addr_legal) {
4905			parameter_len += (uint16_t) sizeof(uint16_t);
4906		}
4907		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4908		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4909		sup_addr->ph.param_length = htons(parameter_len);
4910		i = 0;
4911		if (stcb->asoc.scope.ipv4_addr_legal) {
4912			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4913		}
4914		if (stcb->asoc.scope.ipv6_addr_legal) {
4915			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4916		}
4917		padding_len = 4 - 2 * i;
4918		chunk_len += parameter_len;
4919	}
4920	SCTP_BUF_LEN(m) = chunk_len;
4921	/* now the addresses */
4922	/*
4923	 * To optimize this we could put the scoping stuff into a structure
4924	 * and remove the individual uint8's from the assoc structure. Then
4925	 * we could just sifa in the address within the stcb. But for now
4926	 * this is a quick hack to get the address stuff teased apart.
4927	 */
4928	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4929	    m, cnt_inits_to,
4930	    &padding_len, &chunk_len);
4931
4932	init->ch.chunk_length = htons(chunk_len);
4933	if (padding_len > 0) {
4934		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4935			sctp_m_freem(m);
4936			return;
4937		}
4938	}
4939	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4940	ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4941	    (struct sockaddr *)&net->ro._l_addr,
4942	    m, 0, NULL, 0, 0, 0, 0,
4943	    inp->sctp_lport, stcb->rport, htonl(0),
4944	    net->port, NULL,
4945	    0, 0,
4946	    so_locked);
4947	SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4948	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4949	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4950}
4951
4952struct mbuf *
4953sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4954    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4955{
4956	/*
4957	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4958	 * being equal to the beginning of the params i.e. (iphlen +
4959	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4960	 * end of the mbuf verifying that all parameters are known.
4961	 *
4962	 * For unknown parameters build and return a mbuf with
4963	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4964	 * processing this chunk stop, and set *abort_processing to 1.
4965	 *
4966	 * By having param_offset be pre-set to where parameters begin it is
4967	 * hoped that this routine may be reused in the future by new
4968	 * features.
4969	 */
4970	struct sctp_paramhdr *phdr, params;
4971
4972	struct mbuf *mat, *op_err;
4973	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4974	int at, limit, pad_needed;
4975	uint16_t ptype, plen, padded_size;
4976	int err_at;
4977
4978	*abort_processing = 0;
4979	mat = in_initpkt;
4980	err_at = 0;
4981	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4982	at = param_offset;
4983	op_err = NULL;
4984	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4985	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4986	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4987		ptype = ntohs(phdr->param_type);
4988		plen = ntohs(phdr->param_length);
4989		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4990			/* wacked parameter */
4991			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4992			goto invalid_size;
4993		}
4994		limit -= SCTP_SIZE32(plen);
4995		/*-
4996		 * All parameters for all chunks that we know/understand are
4997		 * listed here. We process them other places and make
4998		 * appropriate stop actions per the upper bits. However this
4999		 * is the generic routine processor's can call to get back
5000		 * an operr.. to either incorporate (init-ack) or send.
5001		 */
5002		padded_size = SCTP_SIZE32(plen);
5003		switch (ptype) {
5004			/* Param's with variable size */
5005		case SCTP_HEARTBEAT_INFO:
5006		case SCTP_STATE_COOKIE:
5007		case SCTP_UNRECOG_PARAM:
5008		case SCTP_ERROR_CAUSE_IND:
5009			/* ok skip fwd */
5010			at += padded_size;
5011			break;
5012			/* Param's with variable size within a range */
5013		case SCTP_CHUNK_LIST:
5014		case SCTP_SUPPORTED_CHUNK_EXT:
5015			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5016				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5017				goto invalid_size;
5018			}
5019			at += padded_size;
5020			break;
5021		case SCTP_SUPPORTED_ADDRTYPE:
5022			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5023				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5024				goto invalid_size;
5025			}
5026			at += padded_size;
5027			break;
5028		case SCTP_RANDOM:
5029			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5030				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5031				goto invalid_size;
5032			}
5033			at += padded_size;
5034			break;
5035		case SCTP_SET_PRIM_ADDR:
5036		case SCTP_DEL_IP_ADDRESS:
5037		case SCTP_ADD_IP_ADDRESS:
5038			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5039			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5040				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5041				goto invalid_size;
5042			}
5043			at += padded_size;
5044			break;
5045			/* Param's with a fixed size */
5046		case SCTP_IPV4_ADDRESS:
5047			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5048				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5049				goto invalid_size;
5050			}
5051			at += padded_size;
5052			break;
5053		case SCTP_IPV6_ADDRESS:
5054			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5055				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5056				goto invalid_size;
5057			}
5058			at += padded_size;
5059			break;
5060		case SCTP_COOKIE_PRESERVE:
5061			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5062				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5063				goto invalid_size;
5064			}
5065			at += padded_size;
5066			break;
5067		case SCTP_HAS_NAT_SUPPORT:
5068			*nat_friendly = 1;
5069			/* fall through */
5070		case SCTP_PRSCTP_SUPPORTED:
5071			if (padded_size != sizeof(struct sctp_paramhdr)) {
5072				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5073				goto invalid_size;
5074			}
5075			at += padded_size;
5076			break;
5077		case SCTP_ECN_CAPABLE:
5078			if (padded_size != sizeof(struct sctp_paramhdr)) {
5079				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5080				goto invalid_size;
5081			}
5082			at += padded_size;
5083			break;
5084		case SCTP_ULP_ADAPTATION:
5085			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5086				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5087				goto invalid_size;
5088			}
5089			at += padded_size;
5090			break;
5091		case SCTP_SUCCESS_REPORT:
5092			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5093				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5094				goto invalid_size;
5095			}
5096			at += padded_size;
5097			break;
5098		case SCTP_HOSTNAME_ADDRESS:
5099			{
5100				/* We can NOT handle HOST NAME addresses!! */
5101				int l_len;
5102
5103				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5104				*abort_processing = 1;
5105				if (op_err == NULL) {
5106					/* Ok need to try to get a mbuf */
5107#ifdef INET6
5108					l_len = SCTP_MIN_OVERHEAD;
5109#else
5110					l_len = SCTP_MIN_V4_OVERHEAD;
5111#endif
5112					l_len += sizeof(struct sctp_chunkhdr);
5113					l_len += plen;
5114					l_len += sizeof(struct sctp_paramhdr);
5115					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5116					if (op_err) {
5117						SCTP_BUF_LEN(op_err) = 0;
5118						/*
5119						 * pre-reserve space for ip
5120						 * and sctp header  and
5121						 * chunk hdr
5122						 */
5123#ifdef INET6
5124						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5125#else
5126						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5127#endif
5128						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5129						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5130					}
5131				}
5132				if (op_err) {
5133					/* If we have space */
5134					struct sctp_paramhdr s;
5135
5136					if (err_at % 4) {
5137						uint32_t cpthis = 0;
5138
5139						pad_needed = 4 - (err_at % 4);
5140						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5141						err_at += pad_needed;
5142					}
5143					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5144					s.param_length = htons(sizeof(s) + plen);
5145					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5146					err_at += sizeof(s);
5147					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(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, min(sizeof(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
5253#ifdef INET6
5254		l_len = SCTP_MIN_OVERHEAD;
5255#else
5256		l_len = SCTP_MIN_V4_OVERHEAD;
5257#endif
5258		l_len += sizeof(struct sctp_chunkhdr);
5259		l_len += (2 * sizeof(struct sctp_paramhdr));
5260		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5261		if (op_err) {
5262			SCTP_BUF_LEN(op_err) = 0;
5263#ifdef INET6
5264			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5265#else
5266			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5267#endif
5268			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5269			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5270		}
5271	}
5272	if ((op_err) && phdr) {
5273		struct sctp_paramhdr s;
5274
5275		if (err_at % 4) {
5276			uint32_t cpthis = 0;
5277
5278			pad_needed = 4 - (err_at % 4);
5279			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5280			err_at += pad_needed;
5281		}
5282		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5283		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5284		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5285		err_at += sizeof(s);
5286		/* Only copy back the p-hdr that caused the issue */
5287		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5288	}
5289	return (op_err);
5290}
5291
5292static int
5293sctp_are_there_new_addresses(struct sctp_association *asoc,
5294    struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5295{
5296	/*
5297	 * Given a INIT packet, look through the packet to verify that there
5298	 * are NO new addresses. As we go through the parameters add reports
5299	 * of any un-understood parameters that require an error.  Also we
5300	 * must return (1) to drop the packet if we see a un-understood
5301	 * parameter that tells us to drop the chunk.
5302	 */
5303	struct sockaddr *sa_touse;
5304	struct sockaddr *sa;
5305	struct sctp_paramhdr *phdr, params;
5306	uint16_t ptype, plen;
5307	uint8_t fnd;
5308	struct sctp_nets *net;
5309
5310#ifdef INET
5311	struct sockaddr_in sin4, *sa4;
5312
5313#endif
5314#ifdef INET6
5315	struct sockaddr_in6 sin6, *sa6;
5316
5317#endif
5318
5319#ifdef INET
5320	memset(&sin4, 0, sizeof(sin4));
5321	sin4.sin_family = AF_INET;
5322	sin4.sin_len = sizeof(sin4);
5323#endif
5324#ifdef INET6
5325	memset(&sin6, 0, sizeof(sin6));
5326	sin6.sin6_family = AF_INET6;
5327	sin6.sin6_len = sizeof(sin6);
5328#endif
5329	/* First what about the src address of the pkt ? */
5330	fnd = 0;
5331	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5332		sa = (struct sockaddr *)&net->ro._l_addr;
5333		if (sa->sa_family == src->sa_family) {
5334#ifdef INET
5335			if (sa->sa_family == AF_INET) {
5336				struct sockaddr_in *src4;
5337
5338				sa4 = (struct sockaddr_in *)sa;
5339				src4 = (struct sockaddr_in *)src;
5340				if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5341					fnd = 1;
5342					break;
5343				}
5344			}
5345#endif
5346#ifdef INET6
5347			if (sa->sa_family == AF_INET6) {
5348				struct sockaddr_in6 *src6;
5349
5350				sa6 = (struct sockaddr_in6 *)sa;
5351				src6 = (struct sockaddr_in6 *)src;
5352				if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5353					fnd = 1;
5354					break;
5355				}
5356			}
5357#endif
5358		}
5359	}
5360	if (fnd == 0) {
5361		/* New address added! no need to look futher. */
5362		return (1);
5363	}
5364	/* Ok so far lets munge through the rest of the packet */
5365	offset += sizeof(struct sctp_init_chunk);
5366	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5367	while (phdr) {
5368		sa_touse = NULL;
5369		ptype = ntohs(phdr->param_type);
5370		plen = ntohs(phdr->param_length);
5371		switch (ptype) {
5372#ifdef INET
5373		case SCTP_IPV4_ADDRESS:
5374			{
5375				struct sctp_ipv4addr_param *p4, p4_buf;
5376
5377				phdr = sctp_get_next_param(in_initpkt, offset,
5378				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5379				if (plen != sizeof(struct sctp_ipv4addr_param) ||
5380				    phdr == NULL) {
5381					return (1);
5382				}
5383				p4 = (struct sctp_ipv4addr_param *)phdr;
5384				sin4.sin_addr.s_addr = p4->addr;
5385				sa_touse = (struct sockaddr *)&sin4;
5386				break;
5387			}
5388#endif
5389#ifdef INET6
5390		case SCTP_IPV6_ADDRESS:
5391			{
5392				struct sctp_ipv6addr_param *p6, p6_buf;
5393
5394				phdr = sctp_get_next_param(in_initpkt, offset,
5395				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5396				if (plen != sizeof(struct sctp_ipv6addr_param) ||
5397				    phdr == NULL) {
5398					return (1);
5399				}
5400				p6 = (struct sctp_ipv6addr_param *)phdr;
5401				memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5402				    sizeof(p6->addr));
5403				sa_touse = (struct sockaddr *)&sin6;
5404				break;
5405			}
5406#endif
5407		default:
5408			sa_touse = NULL;
5409			break;
5410		}
5411		if (sa_touse) {
5412			/* ok, sa_touse points to one to check */
5413			fnd = 0;
5414			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5415				sa = (struct sockaddr *)&net->ro._l_addr;
5416				if (sa->sa_family != sa_touse->sa_family) {
5417					continue;
5418				}
5419#ifdef INET
5420				if (sa->sa_family == AF_INET) {
5421					sa4 = (struct sockaddr_in *)sa;
5422					if (sa4->sin_addr.s_addr ==
5423					    sin4.sin_addr.s_addr) {
5424						fnd = 1;
5425						break;
5426					}
5427				}
5428#endif
5429#ifdef INET6
5430				if (sa->sa_family == AF_INET6) {
5431					sa6 = (struct sockaddr_in6 *)sa;
5432					if (SCTP6_ARE_ADDR_EQUAL(
5433					    sa6, &sin6)) {
5434						fnd = 1;
5435						break;
5436					}
5437				}
5438#endif
5439			}
5440			if (!fnd) {
5441				/* New addr added! no need to look further */
5442				return (1);
5443			}
5444		}
5445		offset += SCTP_SIZE32(plen);
5446		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5447	}
5448	return (0);
5449}
5450
5451/*
5452 * Given a MBUF chain that was sent into us containing an INIT. Build a
5453 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5454 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5455 * message (i.e. the struct sctp_init_msg).
5456 */
5457void
5458sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5459    struct mbuf *init_pkt, int iphlen, int offset,
5460    struct sockaddr *src, struct sockaddr *dst,
5461    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5462    uint8_t mflowtype, uint32_t mflowid,
5463    uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5464{
5465	struct sctp_association *asoc;
5466	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5467	struct sctp_init_ack_chunk *initack;
5468	struct sctp_adaptation_layer_indication *ali;
5469	struct sctp_supported_chunk_types_param *pr_supported;
5470	struct sctp_paramhdr *ph;
5471	union sctp_sockstore *over_addr;
5472	struct sctp_scoping scp;
5473
5474#ifdef INET
5475	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5476	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5477	struct sockaddr_in *sin;
5478
5479#endif
5480#ifdef INET6
5481	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5482	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5483	struct sockaddr_in6 *sin6;
5484
5485#endif
5486	struct sockaddr *to;
5487	struct sctp_state_cookie stc;
5488	struct sctp_nets *net = NULL;
5489	uint8_t *signature = NULL;
5490	int cnt_inits_to = 0;
5491	uint16_t his_limit, i_want;
5492	int abort_flag;
5493	int nat_friendly = 0;
5494	struct socket *so;
5495	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5496
5497	if (stcb) {
5498		asoc = &stcb->asoc;
5499	} else {
5500		asoc = NULL;
5501	}
5502	if ((asoc != NULL) &&
5503	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5504	    (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5505		/* new addresses, out of here in non-cookie-wait states */
5506		/*
5507		 * Send a ABORT, we don't add the new address error clause
5508		 * though we even set the T bit and copy in the 0 tag.. this
5509		 * looks no different than if no listener was present.
5510		 */
5511		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5512		    "Address added");
5513		sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5514		    mflowtype, mflowid,
5515		    vrf_id, port);
5516		return;
5517	}
5518	abort_flag = 0;
5519	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5520	    (offset + sizeof(struct sctp_init_chunk)),
5521	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5522	if (abort_flag) {
5523do_a_abort:
5524		if (op_err == NULL) {
5525			char msg[SCTP_DIAG_INFO_LEN];
5526
5527			snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5528			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5529			    msg);
5530		}
5531		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5532		    init_chk->init.initiate_tag, op_err,
5533		    mflowtype, mflowid,
5534		    vrf_id, port);
5535		return;
5536	}
5537	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5538	if (m == NULL) {
5539		/* No memory, INIT timer will re-attempt. */
5540		if (op_err)
5541			sctp_m_freem(op_err);
5542		return;
5543	}
5544	chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5545	padding_len = 0;
5546
5547	/*
5548	 * We might not overwrite the identification[] completely and on
5549	 * some platforms time_entered will contain some padding. Therefore
5550	 * zero out the cookie to avoid putting uninitialized memory on the
5551	 * wire.
5552	 */
5553	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5554
5555	/* the time I built cookie */
5556	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5557
5558	/* populate any tie tags */
5559	if (asoc != NULL) {
5560		/* unlock before tag selections */
5561		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5562		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5563		stc.cookie_life = asoc->cookie_life;
5564		net = asoc->primary_destination;
5565	} else {
5566		stc.tie_tag_my_vtag = 0;
5567		stc.tie_tag_peer_vtag = 0;
5568		/* life I will award this cookie */
5569		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5570	}
5571
5572	/* copy in the ports for later check */
5573	stc.myport = sh->dest_port;
5574	stc.peerport = sh->src_port;
5575
5576	/*
5577	 * If we wanted to honor cookie life extentions, we would add to
5578	 * stc.cookie_life. For now we should NOT honor any extension
5579	 */
5580	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5581	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5582		stc.ipv6_addr_legal = 1;
5583		if (SCTP_IPV6_V6ONLY(inp)) {
5584			stc.ipv4_addr_legal = 0;
5585		} else {
5586			stc.ipv4_addr_legal = 1;
5587		}
5588	} else {
5589		stc.ipv6_addr_legal = 0;
5590		stc.ipv4_addr_legal = 1;
5591	}
5592	stc.ipv4_scope = 0;
5593	if (net == NULL) {
5594		to = src;
5595		switch (dst->sa_family) {
5596#ifdef INET
5597		case AF_INET:
5598			{
5599				/* lookup address */
5600				stc.address[0] = src4->sin_addr.s_addr;
5601				stc.address[1] = 0;
5602				stc.address[2] = 0;
5603				stc.address[3] = 0;
5604				stc.addr_type = SCTP_IPV4_ADDRESS;
5605				/* local from address */
5606				stc.laddress[0] = dst4->sin_addr.s_addr;
5607				stc.laddress[1] = 0;
5608				stc.laddress[2] = 0;
5609				stc.laddress[3] = 0;
5610				stc.laddr_type = SCTP_IPV4_ADDRESS;
5611				/* scope_id is only for v6 */
5612				stc.scope_id = 0;
5613				if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5614				    (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5615					stc.ipv4_scope = 1;
5616				}
5617				/* Must use the address in this case */
5618				if (sctp_is_address_on_local_host(src, vrf_id)) {
5619					stc.loopback_scope = 1;
5620					stc.ipv4_scope = 1;
5621					stc.site_scope = 1;
5622					stc.local_scope = 0;
5623				}
5624				break;
5625			}
5626#endif
5627#ifdef INET6
5628		case AF_INET6:
5629			{
5630				stc.addr_type = SCTP_IPV6_ADDRESS;
5631				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5632				stc.scope_id = in6_getscope(&src6->sin6_addr);
5633				if (sctp_is_address_on_local_host(src, vrf_id)) {
5634					stc.loopback_scope = 1;
5635					stc.local_scope = 0;
5636					stc.site_scope = 1;
5637					stc.ipv4_scope = 1;
5638				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5639				    IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5640					/*
5641					 * If the new destination or source
5642					 * is a LINK_LOCAL we must have
5643					 * common both site and local scope.
5644					 * Don't set local scope though
5645					 * since we must depend on the
5646					 * source to be added implicitly. We
5647					 * cannot assure just because we
5648					 * share one link that all links are
5649					 * common.
5650					 */
5651					stc.local_scope = 0;
5652					stc.site_scope = 1;
5653					stc.ipv4_scope = 1;
5654					/*
5655					 * we start counting for the private
5656					 * address stuff at 1. since the
5657					 * link local we source from won't
5658					 * show up in our scoped count.
5659					 */
5660					cnt_inits_to = 1;
5661					/*
5662					 * pull out the scope_id from
5663					 * incoming pkt
5664					 */
5665				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5666				    IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5667					/*
5668					 * If the new destination or source
5669					 * is SITE_LOCAL then we must have
5670					 * site scope in common.
5671					 */
5672					stc.site_scope = 1;
5673				}
5674				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5675				stc.laddr_type = SCTP_IPV6_ADDRESS;
5676				break;
5677			}
5678#endif
5679		default:
5680			/* TSNH */
5681			goto do_a_abort;
5682			break;
5683		}
5684	} else {
5685		/* set the scope per the existing tcb */
5686
5687#ifdef INET6
5688		struct sctp_nets *lnet;
5689
5690#endif
5691
5692		stc.loopback_scope = asoc->scope.loopback_scope;
5693		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5694		stc.site_scope = asoc->scope.site_scope;
5695		stc.local_scope = asoc->scope.local_scope;
5696#ifdef INET6
5697		/* Why do we not consider IPv4 LL addresses? */
5698		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5699			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5700				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5701					/*
5702					 * if we have a LL address, start
5703					 * counting at 1.
5704					 */
5705					cnt_inits_to = 1;
5706				}
5707			}
5708		}
5709#endif
5710		/* use the net pointer */
5711		to = (struct sockaddr *)&net->ro._l_addr;
5712		switch (to->sa_family) {
5713#ifdef INET
5714		case AF_INET:
5715			sin = (struct sockaddr_in *)to;
5716			stc.address[0] = sin->sin_addr.s_addr;
5717			stc.address[1] = 0;
5718			stc.address[2] = 0;
5719			stc.address[3] = 0;
5720			stc.addr_type = SCTP_IPV4_ADDRESS;
5721			if (net->src_addr_selected == 0) {
5722				/*
5723				 * strange case here, the INIT should have
5724				 * did the selection.
5725				 */
5726				net->ro._s_addr = sctp_source_address_selection(inp,
5727				    stcb, (sctp_route_t *) & net->ro,
5728				    net, 0, vrf_id);
5729				if (net->ro._s_addr == NULL)
5730					return;
5731
5732				net->src_addr_selected = 1;
5733
5734			}
5735			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5736			stc.laddress[1] = 0;
5737			stc.laddress[2] = 0;
5738			stc.laddress[3] = 0;
5739			stc.laddr_type = SCTP_IPV4_ADDRESS;
5740			/* scope_id is only for v6 */
5741			stc.scope_id = 0;
5742			break;
5743#endif
5744#ifdef INET6
5745		case AF_INET6:
5746			sin6 = (struct sockaddr_in6 *)to;
5747			memcpy(&stc.address, &sin6->sin6_addr,
5748			    sizeof(struct in6_addr));
5749			stc.addr_type = SCTP_IPV6_ADDRESS;
5750			stc.scope_id = sin6->sin6_scope_id;
5751			if (net->src_addr_selected == 0) {
5752				/*
5753				 * strange case here, the INIT should have
5754				 * done the selection.
5755				 */
5756				net->ro._s_addr = sctp_source_address_selection(inp,
5757				    stcb, (sctp_route_t *) & net->ro,
5758				    net, 0, vrf_id);
5759				if (net->ro._s_addr == NULL)
5760					return;
5761
5762				net->src_addr_selected = 1;
5763			}
5764			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5765			    sizeof(struct in6_addr));
5766			stc.laddr_type = SCTP_IPV6_ADDRESS;
5767			break;
5768#endif
5769		}
5770	}
5771	/* Now lets put the SCTP header in place */
5772	initack = mtod(m, struct sctp_init_ack_chunk *);
5773	/* Save it off for quick ref */
5774	stc.peers_vtag = init_chk->init.initiate_tag;
5775	/* who are we */
5776	memcpy(stc.identification, SCTP_VERSION_STRING,
5777	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5778	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5779	/* now the chunk header */
5780	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5781	initack->ch.chunk_flags = 0;
5782	/* fill in later from mbuf we build */
5783	initack->ch.chunk_length = 0;
5784	/* place in my tag */
5785	if ((asoc != NULL) &&
5786	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5787	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5788	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5789		/* re-use the v-tags and init-seq here */
5790		initack->init.initiate_tag = htonl(asoc->my_vtag);
5791		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5792	} else {
5793		uint32_t vtag, itsn;
5794
5795		if (hold_inp_lock) {
5796			SCTP_INP_INCR_REF(inp);
5797			SCTP_INP_RUNLOCK(inp);
5798		}
5799		if (asoc) {
5800			atomic_add_int(&asoc->refcnt, 1);
5801			SCTP_TCB_UNLOCK(stcb);
5802	new_tag:
5803			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5804			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5805				/*
5806				 * Got a duplicate vtag on some guy behind a
5807				 * nat make sure we don't use it.
5808				 */
5809				goto new_tag;
5810			}
5811			initack->init.initiate_tag = htonl(vtag);
5812			/* get a TSN to use too */
5813			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5814			initack->init.initial_tsn = htonl(itsn);
5815			SCTP_TCB_LOCK(stcb);
5816			atomic_add_int(&asoc->refcnt, -1);
5817		} else {
5818			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5819			initack->init.initiate_tag = htonl(vtag);
5820			/* get a TSN to use too */
5821			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5822		}
5823		if (hold_inp_lock) {
5824			SCTP_INP_RLOCK(inp);
5825			SCTP_INP_DECR_REF(inp);
5826		}
5827	}
5828	/* save away my tag to */
5829	stc.my_vtag = initack->init.initiate_tag;
5830
5831	/* set up some of the credits. */
5832	so = inp->sctp_socket;
5833	if (so == NULL) {
5834		/* memory problem */
5835		sctp_m_freem(m);
5836		return;
5837	} else {
5838		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5839	}
5840	/* set what I want */
5841	his_limit = ntohs(init_chk->init.num_inbound_streams);
5842	/* choose what I want */
5843	if (asoc != NULL) {
5844		if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5845			i_want = asoc->streamoutcnt;
5846		} else {
5847			i_want = inp->sctp_ep.pre_open_stream_count;
5848		}
5849	} else {
5850		i_want = inp->sctp_ep.pre_open_stream_count;
5851	}
5852	if (his_limit < i_want) {
5853		/* I Want more :< */
5854		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5855	} else {
5856		/* I can have what I want :> */
5857		initack->init.num_outbound_streams = htons(i_want);
5858	}
5859	/* tell him his limit. */
5860	initack->init.num_inbound_streams =
5861	    htons(inp->sctp_ep.max_open_streams_intome);
5862
5863	/* adaptation layer indication parameter */
5864	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5865		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5866		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5867		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5868		ali->ph.param_length = htons(parameter_len);
5869		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5870		chunk_len += parameter_len;
5871	}
5872	/* ECN parameter */
5873	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5874	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5875		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5876		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5877		ph->param_type = htons(SCTP_ECN_CAPABLE);
5878		ph->param_length = htons(parameter_len);
5879		chunk_len += parameter_len;
5880	}
5881	/* PR-SCTP supported parameter */
5882	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5883	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5884		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5885		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5886		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5887		ph->param_length = htons(parameter_len);
5888		chunk_len += parameter_len;
5889	}
5890	/* Add NAT friendly parameter */
5891	if (nat_friendly) {
5892		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5893		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5894		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5895		ph->param_length = htons(parameter_len);
5896		chunk_len += parameter_len;
5897	}
5898	/* And now tell the peer which extensions we support */
5899	num_ext = 0;
5900	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5901	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5902	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5903		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5904	}
5905	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5906	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5907		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5908	}
5909	if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5910	    ((asoc == NULL) && (inp->asconf_supported == 1))) {
5911		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5912		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5913	}
5914	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5915	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5916		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5917	}
5918	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5919	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5920		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5921	}
5922	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5923	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5924		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5925	}
5926	if (num_ext > 0) {
5927		parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5928		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5929		pr_supported->ph.param_length = htons(parameter_len);
5930		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5931		chunk_len += parameter_len;
5932	}
5933	/* add authentication parameters */
5934	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5935	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5936		struct sctp_auth_random *randp;
5937		struct sctp_auth_hmac_algo *hmacs;
5938		struct sctp_auth_chunk_list *chunks;
5939
5940		if (padding_len > 0) {
5941			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5942			chunk_len += padding_len;
5943			padding_len = 0;
5944		}
5945		/* generate and add RANDOM parameter */
5946		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5947		parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5948		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5949		randp->ph.param_type = htons(SCTP_RANDOM);
5950		randp->ph.param_length = htons(parameter_len);
5951		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5952		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5953		chunk_len += parameter_len;
5954
5955		if (padding_len > 0) {
5956			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5957			chunk_len += padding_len;
5958			padding_len = 0;
5959		}
5960		/* add HMAC_ALGO parameter */
5961		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5962		parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5963		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5964		    (uint8_t *) hmacs->hmac_ids);
5965		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5966		hmacs->ph.param_length = htons(parameter_len);
5967		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5968		chunk_len += parameter_len;
5969
5970		if (padding_len > 0) {
5971			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5972			chunk_len += padding_len;
5973			padding_len = 0;
5974		}
5975		/* add CHUNKS parameter */
5976		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
5977		parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
5978		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5979		    chunks->chunk_types);
5980		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5981		chunks->ph.param_length = htons(parameter_len);
5982		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5983		chunk_len += parameter_len;
5984	}
5985	SCTP_BUF_LEN(m) = chunk_len;
5986	m_last = m;
5987	/* now the addresses */
5988	/*
5989	 * To optimize this we could put the scoping stuff into a structure
5990	 * and remove the individual uint8's from the stc structure. Then we
5991	 * could just sifa in the address within the stc.. but for now this
5992	 * is a quick hack to get the address stuff teased apart.
5993	 */
5994	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5995	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5996	scp.loopback_scope = stc.loopback_scope;
5997	scp.ipv4_local_scope = stc.ipv4_scope;
5998	scp.local_scope = stc.local_scope;
5999	scp.site_scope = stc.site_scope;
6000	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6001	    cnt_inits_to,
6002	    &padding_len, &chunk_len);
6003	/* padding_len can only be positive, if no addresses have been added */
6004	if (padding_len > 0) {
6005		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6006		chunk_len += padding_len;
6007		SCTP_BUF_LEN(m) += padding_len;
6008		padding_len = 0;
6009	}
6010	/* tack on the operational error if present */
6011	if (op_err) {
6012		parameter_len = 0;
6013		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6014			parameter_len += SCTP_BUF_LEN(m_tmp);
6015		}
6016		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6017		SCTP_BUF_NEXT(m_last) = op_err;
6018		while (SCTP_BUF_NEXT(m_last) != NULL) {
6019			m_last = SCTP_BUF_NEXT(m_last);
6020		}
6021		chunk_len += parameter_len;
6022	}
6023	if (padding_len > 0) {
6024		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6025		if (m_last == NULL) {
6026			/* Houston we have a problem, no space */
6027			sctp_m_freem(m);
6028			return;
6029		}
6030		chunk_len += padding_len;
6031		padding_len = 0;
6032	}
6033	/* Now we must build a cookie */
6034	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6035	if (m_cookie == NULL) {
6036		/* memory problem */
6037		sctp_m_freem(m);
6038		return;
6039	}
6040	/* Now append the cookie to the end and update the space/size */
6041	SCTP_BUF_NEXT(m_last) = m_cookie;
6042	parameter_len = 0;
6043	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6044		parameter_len += SCTP_BUF_LEN(m_tmp);
6045		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6046			m_last = m_tmp;
6047		}
6048	}
6049	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6050	chunk_len += parameter_len;
6051
6052	/*
6053	 * Place in the size, but we don't include the last pad (if any) in
6054	 * the INIT-ACK.
6055	 */
6056	initack->ch.chunk_length = htons(chunk_len);
6057
6058	/*
6059	 * Time to sign the cookie, we don't sign over the cookie signature
6060	 * though thus we set trailer.
6061	 */
6062	(void)sctp_hmac_m(SCTP_HMAC,
6063	    (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6064	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6065	    (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6066	/*
6067	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6068	 * here since the timer will drive a retranmission.
6069	 */
6070	if (padding_len > 0) {
6071		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6072			sctp_m_freem(m);
6073			return;
6074		}
6075	}
6076	if (stc.loopback_scope) {
6077		over_addr = (union sctp_sockstore *)dst;
6078	} else {
6079		over_addr = NULL;
6080	}
6081
6082	(void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6083	    0, 0,
6084	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6085	    port, over_addr,
6086	    mflowtype, mflowid,
6087	    SCTP_SO_NOT_LOCKED);
6088	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6089}
6090
6091
6092static void
6093sctp_prune_prsctp(struct sctp_tcb *stcb,
6094    struct sctp_association *asoc,
6095    struct sctp_sndrcvinfo *srcv,
6096    int dataout)
6097{
6098	int freed_spc = 0;
6099	struct sctp_tmit_chunk *chk, *nchk;
6100
6101	SCTP_TCB_LOCK_ASSERT(stcb);
6102	if ((asoc->prsctp_supported) &&
6103	    (asoc->sent_queue_cnt_removeable > 0)) {
6104		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6105			/*
6106			 * Look for chunks marked with the PR_SCTP flag AND
6107			 * the buffer space flag. If the one being sent is
6108			 * equal or greater priority then purge the old one
6109			 * and free some space.
6110			 */
6111			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6112				/*
6113				 * This one is PR-SCTP AND buffer space
6114				 * limited type
6115				 */
6116				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6117					/*
6118					 * Lower numbers equates to higher
6119					 * priority so if the one we are
6120					 * looking at has a larger or equal
6121					 * priority we want to drop the data
6122					 * and NOT retransmit it.
6123					 */
6124					if (chk->data) {
6125						/*
6126						 * We release the book_size
6127						 * if the mbuf is here
6128						 */
6129						int ret_spc;
6130						uint8_t sent;
6131
6132						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6133							sent = 1;
6134						else
6135							sent = 0;
6136						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6137						    sent,
6138						    SCTP_SO_LOCKED);
6139						freed_spc += ret_spc;
6140						if (freed_spc >= dataout) {
6141							return;
6142						}
6143					}	/* if chunk was present */
6144				}	/* if of sufficent priority */
6145			}	/* if chunk has enabled */
6146		}		/* tailqforeach */
6147
6148		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6149			/* Here we must move to the sent queue and mark */
6150			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6151				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6152					if (chk->data) {
6153						/*
6154						 * We release the book_size
6155						 * if the mbuf is here
6156						 */
6157						int ret_spc;
6158
6159						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6160						    0, SCTP_SO_LOCKED);
6161
6162						freed_spc += ret_spc;
6163						if (freed_spc >= dataout) {
6164							return;
6165						}
6166					}	/* end if chk->data */
6167				}	/* end if right class */
6168			}	/* end if chk pr-sctp */
6169		}		/* tailqforeachsafe (chk) */
6170	}			/* if enabled in asoc */
6171}
6172
6173int
6174sctp_get_frag_point(struct sctp_tcb *stcb,
6175    struct sctp_association *asoc)
6176{
6177	int siz, ovh;
6178
6179	/*
6180	 * For endpoints that have both v6 and v4 addresses we must reserve
6181	 * room for the ipv6 header, for those that are only dealing with V4
6182	 * we use a larger frag point.
6183	 */
6184	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6185		ovh = SCTP_MED_OVERHEAD;
6186	} else {
6187		ovh = SCTP_MED_V4_OVERHEAD;
6188	}
6189
6190	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6191		siz = asoc->smallest_mtu - ovh;
6192	else
6193		siz = (stcb->asoc.sctp_frag_point - ovh);
6194	/*
6195	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6196	 */
6197	/* A data chunk MUST fit in a cluster */
6198	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6199	/* } */
6200
6201	/* adjust for an AUTH chunk if DATA requires auth */
6202	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6203		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6204
6205	if (siz % 4) {
6206		/* make it an even word boundary please */
6207		siz -= (siz % 4);
6208	}
6209	return (siz);
6210}
6211
6212static void
6213sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6214{
6215	/*
6216	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6217	 * positive lifetime but does not specify any PR_SCTP policy.
6218	 */
6219	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6220		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6221	} else if (sp->timetolive > 0) {
6222		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6223		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6224	} else {
6225		return;
6226	}
6227	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6228	case CHUNK_FLAGS_PR_SCTP_BUF:
6229		/*
6230		 * Time to live is a priority stored in tv_sec when doing
6231		 * the buffer drop thing.
6232		 */
6233		sp->ts.tv_sec = sp->timetolive;
6234		sp->ts.tv_usec = 0;
6235		break;
6236	case CHUNK_FLAGS_PR_SCTP_TTL:
6237		{
6238			struct timeval tv;
6239
6240			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6241			tv.tv_sec = sp->timetolive / 1000;
6242			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6243			/*
6244			 * TODO sctp_constants.h needs alternative time
6245			 * macros when _KERNEL is undefined.
6246			 */
6247			timevaladd(&sp->ts, &tv);
6248		}
6249		break;
6250	case CHUNK_FLAGS_PR_SCTP_RTX:
6251		/*
6252		 * Time to live is a the number or retransmissions stored in
6253		 * tv_sec.
6254		 */
6255		sp->ts.tv_sec = sp->timetolive;
6256		sp->ts.tv_usec = 0;
6257		break;
6258	default:
6259		SCTPDBG(SCTP_DEBUG_USRREQ1,
6260		    "Unknown PR_SCTP policy %u.\n",
6261		    PR_SCTP_POLICY(sp->sinfo_flags));
6262		break;
6263	}
6264}
6265
6266static int
6267sctp_msg_append(struct sctp_tcb *stcb,
6268    struct sctp_nets *net,
6269    struct mbuf *m,
6270    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6271{
6272	int error = 0;
6273	struct mbuf *at;
6274	struct sctp_stream_queue_pending *sp = NULL;
6275	struct sctp_stream_out *strm;
6276
6277	/*
6278	 * Given an mbuf chain, put it into the association send queue and
6279	 * place it on the wheel
6280	 */
6281	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6282		/* Invalid stream number */
6283		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6284		error = EINVAL;
6285		goto out_now;
6286	}
6287	if ((stcb->asoc.stream_locked) &&
6288	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6289		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6290		error = EINVAL;
6291		goto out_now;
6292	}
6293	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6294	/* Now can we send this? */
6295	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6296	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6297	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6298	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6299		/* got data while shutting down */
6300		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6301		error = ECONNRESET;
6302		goto out_now;
6303	}
6304	sctp_alloc_a_strmoq(stcb, sp);
6305	if (sp == NULL) {
6306		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6307		error = ENOMEM;
6308		goto out_now;
6309	}
6310	sp->sinfo_flags = srcv->sinfo_flags;
6311	sp->timetolive = srcv->sinfo_timetolive;
6312	sp->ppid = srcv->sinfo_ppid;
6313	sp->context = srcv->sinfo_context;
6314	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6315		sp->net = net;
6316		atomic_add_int(&sp->net->ref_count, 1);
6317	} else {
6318		sp->net = NULL;
6319	}
6320	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6321	sp->stream = srcv->sinfo_stream;
6322	sp->msg_is_complete = 1;
6323	sp->sender_all_done = 1;
6324	sp->some_taken = 0;
6325	sp->data = m;
6326	sp->tail_mbuf = NULL;
6327	sctp_set_prsctp_policy(sp);
6328	/*
6329	 * We could in theory (for sendall) sifa the length in, but we would
6330	 * still have to hunt through the chain since we need to setup the
6331	 * tail_mbuf
6332	 */
6333	sp->length = 0;
6334	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6335		if (SCTP_BUF_NEXT(at) == NULL)
6336			sp->tail_mbuf = at;
6337		sp->length += SCTP_BUF_LEN(at);
6338	}
6339	if (srcv->sinfo_keynumber_valid) {
6340		sp->auth_keyid = srcv->sinfo_keynumber;
6341	} else {
6342		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6343	}
6344	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6345		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6346		sp->holds_key_ref = 1;
6347	}
6348	if (hold_stcb_lock == 0) {
6349		SCTP_TCB_SEND_LOCK(stcb);
6350	}
6351	sctp_snd_sb_alloc(stcb, sp->length);
6352	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6353	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6354	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6355	m = NULL;
6356	if (hold_stcb_lock == 0) {
6357		SCTP_TCB_SEND_UNLOCK(stcb);
6358	}
6359out_now:
6360	if (m) {
6361		sctp_m_freem(m);
6362	}
6363	return (error);
6364}
6365
6366
6367static struct mbuf *
6368sctp_copy_mbufchain(struct mbuf *clonechain,
6369    struct mbuf *outchain,
6370    struct mbuf **endofchain,
6371    int can_take_mbuf,
6372    int sizeofcpy,
6373    uint8_t copy_by_ref)
6374{
6375	struct mbuf *m;
6376	struct mbuf *appendchain;
6377	caddr_t cp;
6378	int len;
6379
6380	if (endofchain == NULL) {
6381		/* error */
6382error_out:
6383		if (outchain)
6384			sctp_m_freem(outchain);
6385		return (NULL);
6386	}
6387	if (can_take_mbuf) {
6388		appendchain = clonechain;
6389	} else {
6390		if (!copy_by_ref &&
6391		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6392		    ) {
6393			/* Its not in a cluster */
6394			if (*endofchain == NULL) {
6395				/* lets get a mbuf cluster */
6396				if (outchain == NULL) {
6397					/* This is the general case */
6398			new_mbuf:
6399					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6400					if (outchain == NULL) {
6401						goto error_out;
6402					}
6403					SCTP_BUF_LEN(outchain) = 0;
6404					*endofchain = outchain;
6405					/* get the prepend space */
6406					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6407				} else {
6408					/*
6409					 * We really should not get a NULL
6410					 * in endofchain
6411					 */
6412					/* find end */
6413					m = outchain;
6414					while (m) {
6415						if (SCTP_BUF_NEXT(m) == NULL) {
6416							*endofchain = m;
6417							break;
6418						}
6419						m = SCTP_BUF_NEXT(m);
6420					}
6421					/* sanity */
6422					if (*endofchain == NULL) {
6423						/*
6424						 * huh, TSNH XXX maybe we
6425						 * should panic
6426						 */
6427						sctp_m_freem(outchain);
6428						goto new_mbuf;
6429					}
6430				}
6431				/* get the new end of length */
6432				len = M_TRAILINGSPACE(*endofchain);
6433			} else {
6434				/* how much is left at the end? */
6435				len = M_TRAILINGSPACE(*endofchain);
6436			}
6437			/* Find the end of the data, for appending */
6438			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6439
6440			/* Now lets copy it out */
6441			if (len >= sizeofcpy) {
6442				/* It all fits, copy it in */
6443				m_copydata(clonechain, 0, sizeofcpy, cp);
6444				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6445			} else {
6446				/* fill up the end of the chain */
6447				if (len > 0) {
6448					m_copydata(clonechain, 0, len, cp);
6449					SCTP_BUF_LEN((*endofchain)) += len;
6450					/* now we need another one */
6451					sizeofcpy -= len;
6452				}
6453				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6454				if (m == NULL) {
6455					/* We failed */
6456					goto error_out;
6457				}
6458				SCTP_BUF_NEXT((*endofchain)) = m;
6459				*endofchain = m;
6460				cp = mtod((*endofchain), caddr_t);
6461				m_copydata(clonechain, len, sizeofcpy, cp);
6462				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6463			}
6464			return (outchain);
6465		} else {
6466			/* copy the old fashion way */
6467			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6468#ifdef SCTP_MBUF_LOGGING
6469			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6470				sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6471			}
6472#endif
6473		}
6474	}
6475	if (appendchain == NULL) {
6476		/* error */
6477		if (outchain)
6478			sctp_m_freem(outchain);
6479		return (NULL);
6480	}
6481	if (outchain) {
6482		/* tack on to the end */
6483		if (*endofchain != NULL) {
6484			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6485		} else {
6486			m = outchain;
6487			while (m) {
6488				if (SCTP_BUF_NEXT(m) == NULL) {
6489					SCTP_BUF_NEXT(m) = appendchain;
6490					break;
6491				}
6492				m = SCTP_BUF_NEXT(m);
6493			}
6494		}
6495		/*
6496		 * save off the end and update the end-chain postion
6497		 */
6498		m = appendchain;
6499		while (m) {
6500			if (SCTP_BUF_NEXT(m) == NULL) {
6501				*endofchain = m;
6502				break;
6503			}
6504			m = SCTP_BUF_NEXT(m);
6505		}
6506		return (outchain);
6507	} else {
6508		/* save off the end and update the end-chain postion */
6509		m = appendchain;
6510		while (m) {
6511			if (SCTP_BUF_NEXT(m) == NULL) {
6512				*endofchain = m;
6513				break;
6514			}
6515			m = SCTP_BUF_NEXT(m);
6516		}
6517		return (appendchain);
6518	}
6519}
6520
6521static int
6522sctp_med_chunk_output(struct sctp_inpcb *inp,
6523    struct sctp_tcb *stcb,
6524    struct sctp_association *asoc,
6525    int *num_out,
6526    int *reason_code,
6527    int control_only, int from_where,
6528    struct timeval *now, int *now_filled, int frag_point, int so_locked
6529#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6530    SCTP_UNUSED
6531#endif
6532);
6533
6534static void
6535sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6536    uint32_t val SCTP_UNUSED)
6537{
6538	struct sctp_copy_all *ca;
6539	struct mbuf *m;
6540	int ret = 0;
6541	int added_control = 0;
6542	int un_sent, do_chunk_output = 1;
6543	struct sctp_association *asoc;
6544	struct sctp_nets *net;
6545
6546	ca = (struct sctp_copy_all *)ptr;
6547	if (ca->m == NULL) {
6548		return;
6549	}
6550	if (ca->inp != inp) {
6551		/* TSNH */
6552		return;
6553	}
6554	if (ca->sndlen > 0) {
6555		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6556		if (m == NULL) {
6557			/* can't copy so we are done */
6558			ca->cnt_failed++;
6559			return;
6560		}
6561#ifdef SCTP_MBUF_LOGGING
6562		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6563			sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6564		}
6565#endif
6566	} else {
6567		m = NULL;
6568	}
6569	SCTP_TCB_LOCK_ASSERT(stcb);
6570	if (stcb->asoc.alternate) {
6571		net = stcb->asoc.alternate;
6572	} else {
6573		net = stcb->asoc.primary_destination;
6574	}
6575	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6576		/* Abort this assoc with m as the user defined reason */
6577		if (m != NULL) {
6578			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6579		} else {
6580			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6581			    0, M_NOWAIT, 1, MT_DATA);
6582			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6583		}
6584		if (m != NULL) {
6585			struct sctp_paramhdr *ph;
6586
6587			ph = mtod(m, struct sctp_paramhdr *);
6588			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6589			ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6590		}
6591		/*
6592		 * We add one here to keep the assoc from dis-appearing on
6593		 * us.
6594		 */
6595		atomic_add_int(&stcb->asoc.refcnt, 1);
6596		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6597		/*
6598		 * sctp_abort_an_association calls sctp_free_asoc() free
6599		 * association will NOT free it since we incremented the
6600		 * refcnt .. we do this to prevent it being freed and things
6601		 * getting tricky since we could end up (from free_asoc)
6602		 * calling inpcb_free which would get a recursive lock call
6603		 * to the iterator lock.. But as a consequence of that the
6604		 * stcb will return to us un-locked.. since free_asoc
6605		 * returns with either no TCB or the TCB unlocked, we must
6606		 * relock.. to unlock in the iterator timer :-0
6607		 */
6608		SCTP_TCB_LOCK(stcb);
6609		atomic_add_int(&stcb->asoc.refcnt, -1);
6610		goto no_chunk_output;
6611	} else {
6612		if (m) {
6613			ret = sctp_msg_append(stcb, net, m,
6614			    &ca->sndrcv, 1);
6615		}
6616		asoc = &stcb->asoc;
6617		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6618			/* shutdown this assoc */
6619			int cnt;
6620
6621			cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6622
6623			if (TAILQ_EMPTY(&asoc->send_queue) &&
6624			    TAILQ_EMPTY(&asoc->sent_queue) &&
6625			    (cnt == 0)) {
6626				if (asoc->locked_on_sending) {
6627					goto abort_anyway;
6628				}
6629				/*
6630				 * there is nothing queued to send, so I'm
6631				 * done...
6632				 */
6633				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6634				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6635				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6636					/*
6637					 * only send SHUTDOWN the first time
6638					 * through
6639					 */
6640					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6641						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6642					}
6643					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6644					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6645					sctp_stop_timers_for_shutdown(stcb);
6646					sctp_send_shutdown(stcb, net);
6647					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6648					    net);
6649					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6650					    asoc->primary_destination);
6651					added_control = 1;
6652					do_chunk_output = 0;
6653				}
6654			} else {
6655				/*
6656				 * we still got (or just got) data to send,
6657				 * so set SHUTDOWN_PENDING
6658				 */
6659				/*
6660				 * XXX sockets draft says that SCTP_EOF
6661				 * should be sent with no data.  currently,
6662				 * we will allow user data to be sent first
6663				 * and move to SHUTDOWN-PENDING
6664				 */
6665				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6666				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6667				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6668					if (asoc->locked_on_sending) {
6669						/*
6670						 * Locked to send out the
6671						 * data
6672						 */
6673						struct sctp_stream_queue_pending *sp;
6674
6675						sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6676						if (sp) {
6677							if ((sp->length == 0) && (sp->msg_is_complete == 0))
6678								asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6679						}
6680					}
6681					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6682					if (TAILQ_EMPTY(&asoc->send_queue) &&
6683					    TAILQ_EMPTY(&asoc->sent_queue) &&
6684					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6685				abort_anyway:
6686						atomic_add_int(&stcb->asoc.refcnt, 1);
6687						sctp_abort_an_association(stcb->sctp_ep, stcb,
6688						    NULL, SCTP_SO_NOT_LOCKED);
6689						atomic_add_int(&stcb->asoc.refcnt, -1);
6690						goto no_chunk_output;
6691					}
6692					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6693					    asoc->primary_destination);
6694				}
6695			}
6696
6697		}
6698	}
6699	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6700	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6701
6702	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6703	    (stcb->asoc.total_flight > 0) &&
6704	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6705		do_chunk_output = 0;
6706	}
6707	if (do_chunk_output)
6708		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6709	else if (added_control) {
6710		int num_out, reason, now_filled = 0;
6711		struct timeval now;
6712		int frag_point;
6713
6714		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6715		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6716		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6717	}
6718no_chunk_output:
6719	if (ret) {
6720		ca->cnt_failed++;
6721	} else {
6722		ca->cnt_sent++;
6723	}
6724}
6725
6726static void
6727sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6728{
6729	struct sctp_copy_all *ca;
6730
6731	ca = (struct sctp_copy_all *)ptr;
6732	/*
6733	 * Do a notify here? Kacheong suggests that the notify be done at
6734	 * the send time.. so you would push up a notification if any send
6735	 * failed. Don't know if this is feasable since the only failures we
6736	 * have is "memory" related and if you cannot get an mbuf to send
6737	 * the data you surely can't get an mbuf to send up to notify the
6738	 * user you can't send the data :->
6739	 */
6740
6741	/* now free everything */
6742	sctp_m_freem(ca->m);
6743	SCTP_FREE(ca, SCTP_M_COPYAL);
6744}
6745
6746static struct mbuf *
6747sctp_copy_out_all(struct uio *uio, int len)
6748{
6749	struct mbuf *ret, *at;
6750	int left, willcpy, cancpy, error;
6751
6752	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6753	if (ret == NULL) {
6754		/* TSNH */
6755		return (NULL);
6756	}
6757	left = len;
6758	SCTP_BUF_LEN(ret) = 0;
6759	/* save space for the data chunk header */
6760	cancpy = M_TRAILINGSPACE(ret);
6761	willcpy = min(cancpy, left);
6762	at = ret;
6763	while (left > 0) {
6764		/* Align data to the end */
6765		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6766		if (error) {
6767	err_out_now:
6768			sctp_m_freem(at);
6769			return (NULL);
6770		}
6771		SCTP_BUF_LEN(at) = willcpy;
6772		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6773		left -= willcpy;
6774		if (left > 0) {
6775			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6776			if (SCTP_BUF_NEXT(at) == NULL) {
6777				goto err_out_now;
6778			}
6779			at = SCTP_BUF_NEXT(at);
6780			SCTP_BUF_LEN(at) = 0;
6781			cancpy = M_TRAILINGSPACE(at);
6782			willcpy = min(cancpy, left);
6783		}
6784	}
6785	return (ret);
6786}
6787
6788static int
6789sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6790    struct sctp_sndrcvinfo *srcv)
6791{
6792	int ret;
6793	struct sctp_copy_all *ca;
6794
6795	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6796	    SCTP_M_COPYAL);
6797	if (ca == NULL) {
6798		sctp_m_freem(m);
6799		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6800		return (ENOMEM);
6801	}
6802	memset(ca, 0, sizeof(struct sctp_copy_all));
6803
6804	ca->inp = inp;
6805	if (srcv) {
6806		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6807	}
6808	/*
6809	 * take off the sendall flag, it would be bad if we failed to do
6810	 * this :-0
6811	 */
6812	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6813	/* get length and mbuf chain */
6814	if (uio) {
6815		ca->sndlen = uio->uio_resid;
6816		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6817		if (ca->m == NULL) {
6818			SCTP_FREE(ca, SCTP_M_COPYAL);
6819			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6820			return (ENOMEM);
6821		}
6822	} else {
6823		/* Gather the length of the send */
6824		struct mbuf *mat;
6825
6826		ca->sndlen = 0;
6827		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6828			ca->sndlen += SCTP_BUF_LEN(mat);
6829		}
6830	}
6831	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6832	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6833	    SCTP_ASOC_ANY_STATE,
6834	    (void *)ca, 0,
6835	    sctp_sendall_completes, inp, 1);
6836	if (ret) {
6837		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6838		SCTP_FREE(ca, SCTP_M_COPYAL);
6839		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6840		return (EFAULT);
6841	}
6842	return (0);
6843}
6844
6845
6846void
6847sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6848{
6849	struct sctp_tmit_chunk *chk, *nchk;
6850
6851	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6852		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6853			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6854			if (chk->data) {
6855				sctp_m_freem(chk->data);
6856				chk->data = NULL;
6857			}
6858			asoc->ctrl_queue_cnt--;
6859			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6860		}
6861	}
6862}
6863
6864void
6865sctp_toss_old_asconf(struct sctp_tcb *stcb)
6866{
6867	struct sctp_association *asoc;
6868	struct sctp_tmit_chunk *chk, *nchk;
6869	struct sctp_asconf_chunk *acp;
6870
6871	asoc = &stcb->asoc;
6872	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6873		/* find SCTP_ASCONF chunk in queue */
6874		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6875			if (chk->data) {
6876				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6877				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6878					/* Not Acked yet */
6879					break;
6880				}
6881			}
6882			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6883			if (chk->data) {
6884				sctp_m_freem(chk->data);
6885				chk->data = NULL;
6886			}
6887			asoc->ctrl_queue_cnt--;
6888			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6889		}
6890	}
6891}
6892
6893
6894static void
6895sctp_clean_up_datalist(struct sctp_tcb *stcb,
6896    struct sctp_association *asoc,
6897    struct sctp_tmit_chunk **data_list,
6898    int bundle_at,
6899    struct sctp_nets *net)
6900{
6901	int i;
6902	struct sctp_tmit_chunk *tp1;
6903
6904	for (i = 0; i < bundle_at; i++) {
6905		/* off of the send queue */
6906		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6907		asoc->send_queue_cnt--;
6908		if (i > 0) {
6909			/*
6910			 * Any chunk NOT 0 you zap the time chunk 0 gets
6911			 * zapped or set based on if a RTO measurment is
6912			 * needed.
6913			 */
6914			data_list[i]->do_rtt = 0;
6915		}
6916		/* record time */
6917		data_list[i]->sent_rcv_time = net->last_sent_time;
6918		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6919		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6920		if (data_list[i]->whoTo == NULL) {
6921			data_list[i]->whoTo = net;
6922			atomic_add_int(&net->ref_count, 1);
6923		}
6924		/* on to the sent queue */
6925		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6926		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6927			struct sctp_tmit_chunk *tpp;
6928
6929			/* need to move back */
6930	back_up_more:
6931			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6932			if (tpp == NULL) {
6933				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6934				goto all_done;
6935			}
6936			tp1 = tpp;
6937			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6938				goto back_up_more;
6939			}
6940			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6941		} else {
6942			TAILQ_INSERT_TAIL(&asoc->sent_queue,
6943			    data_list[i],
6944			    sctp_next);
6945		}
6946all_done:
6947		/* This does not lower until the cum-ack passes it */
6948		asoc->sent_queue_cnt++;
6949		if ((asoc->peers_rwnd <= 0) &&
6950		    (asoc->total_flight == 0) &&
6951		    (bundle_at == 1)) {
6952			/* Mark the chunk as being a window probe */
6953			SCTP_STAT_INCR(sctps_windowprobed);
6954		}
6955#ifdef SCTP_AUDITING_ENABLED
6956		sctp_audit_log(0xC2, 3);
6957#endif
6958		data_list[i]->sent = SCTP_DATAGRAM_SENT;
6959		data_list[i]->snd_count = 1;
6960		data_list[i]->rec.data.chunk_was_revoked = 0;
6961		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6962			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6963			    data_list[i]->whoTo->flight_size,
6964			    data_list[i]->book_size,
6965			    (uintptr_t) data_list[i]->whoTo,
6966			    data_list[i]->rec.data.TSN_seq);
6967		}
6968		sctp_flight_size_increase(data_list[i]);
6969		sctp_total_flight_increase(stcb, data_list[i]);
6970		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6971			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6972			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6973		}
6974		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6975		    (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6976		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6977			/* SWS sender side engages */
6978			asoc->peers_rwnd = 0;
6979		}
6980	}
6981	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6982		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6983	}
6984}
6985
6986static void
6987sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6988#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6989    SCTP_UNUSED
6990#endif
6991)
6992{
6993	struct sctp_tmit_chunk *chk, *nchk;
6994
6995	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6996		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6997		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
6998		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6999		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7000		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7001		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7002		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7003		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7004		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7005		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7006		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7007		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7008			/* Stray chunks must be cleaned up */
7009	clean_up_anyway:
7010			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7011			if (chk->data) {
7012				sctp_m_freem(chk->data);
7013				chk->data = NULL;
7014			}
7015			asoc->ctrl_queue_cnt--;
7016			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7017				asoc->fwd_tsn_cnt--;
7018			sctp_free_a_chunk(stcb, chk, so_locked);
7019		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7020			/* special handling, we must look into the param */
7021			if (chk != asoc->str_reset) {
7022				goto clean_up_anyway;
7023			}
7024		}
7025	}
7026}
7027
7028
7029static int
7030sctp_can_we_split_this(struct sctp_tcb *stcb,
7031    uint32_t length,
7032    uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7033{
7034	/*
7035	 * Make a decision on if I should split a msg into multiple parts.
7036	 * This is only asked of incomplete messages.
7037	 */
7038	if (eeor_on) {
7039		/*
7040		 * If we are doing EEOR we need to always send it if its the
7041		 * entire thing, since it might be all the guy is putting in
7042		 * the hopper.
7043		 */
7044		if (goal_mtu >= length) {
7045			/*-
7046			 * If we have data outstanding,
7047			 * we get another chance when the sack
7048			 * arrives to transmit - wait for more data
7049			 */
7050			if (stcb->asoc.total_flight == 0) {
7051				/*
7052				 * If nothing is in flight, we zero the
7053				 * packet counter.
7054				 */
7055				return (length);
7056			}
7057			return (0);
7058
7059		} else {
7060			/* You can fill the rest */
7061			return (goal_mtu);
7062		}
7063	}
7064	/*-
7065	 * For those strange folk that make the send buffer
7066	 * smaller than our fragmentation point, we can't
7067	 * get a full msg in so we have to allow splitting.
7068	 */
7069	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7070		return (length);
7071	}
7072	if ((length <= goal_mtu) ||
7073	    ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7074		/* Sub-optimial residual don't split in non-eeor mode. */
7075		return (0);
7076	}
7077	/*
7078	 * If we reach here length is larger than the goal_mtu. Do we wish
7079	 * to split it for the sake of packet putting together?
7080	 */
7081	if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7082		/* Its ok to split it */
7083		return (min(goal_mtu, frag_point));
7084	}
7085	/* Nope, can't split */
7086	return (0);
7087
7088}
7089
7090static uint32_t
7091sctp_move_to_outqueue(struct sctp_tcb *stcb,
7092    struct sctp_stream_out *strq,
7093    uint32_t goal_mtu,
7094    uint32_t frag_point,
7095    int *locked,
7096    int *giveup,
7097    int eeor_mode,
7098    int *bail,
7099    int so_locked
7100#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7101    SCTP_UNUSED
7102#endif
7103)
7104{
7105	/* Move from the stream to the send_queue keeping track of the total */
7106	struct sctp_association *asoc;
7107	struct sctp_stream_queue_pending *sp;
7108	struct sctp_tmit_chunk *chk;
7109	struct sctp_data_chunk *dchkh;
7110	uint32_t to_move, length;
7111	uint8_t rcv_flags = 0;
7112	uint8_t some_taken;
7113	uint8_t send_lock_up = 0;
7114
7115	SCTP_TCB_LOCK_ASSERT(stcb);
7116	asoc = &stcb->asoc;
7117one_more_time:
7118	/* sa_ignore FREED_MEMORY */
7119	sp = TAILQ_FIRST(&strq->outqueue);
7120	if (sp == NULL) {
7121		*locked = 0;
7122		if (send_lock_up == 0) {
7123			SCTP_TCB_SEND_LOCK(stcb);
7124			send_lock_up = 1;
7125		}
7126		sp = TAILQ_FIRST(&strq->outqueue);
7127		if (sp) {
7128			goto one_more_time;
7129		}
7130		if (strq->last_msg_incomplete) {
7131			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7132			    strq->stream_no,
7133			    strq->last_msg_incomplete);
7134			strq->last_msg_incomplete = 0;
7135		}
7136		to_move = 0;
7137		if (send_lock_up) {
7138			SCTP_TCB_SEND_UNLOCK(stcb);
7139			send_lock_up = 0;
7140		}
7141		goto out_of;
7142	}
7143	if ((sp->msg_is_complete) && (sp->length == 0)) {
7144		if (sp->sender_all_done) {
7145			/*
7146			 * We are doing differed cleanup. Last time through
7147			 * when we took all the data the sender_all_done was
7148			 * not set.
7149			 */
7150			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7151				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7152				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7153				    sp->sender_all_done,
7154				    sp->length,
7155				    sp->msg_is_complete,
7156				    sp->put_last_out,
7157				    send_lock_up);
7158			}
7159			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7160				SCTP_TCB_SEND_LOCK(stcb);
7161				send_lock_up = 1;
7162			}
7163			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7164			TAILQ_REMOVE(&strq->outqueue, sp, next);
7165			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7166			if (sp->net) {
7167				sctp_free_remote_addr(sp->net);
7168				sp->net = NULL;
7169			}
7170			if (sp->data) {
7171				sctp_m_freem(sp->data);
7172				sp->data = NULL;
7173			}
7174			sctp_free_a_strmoq(stcb, sp, so_locked);
7175			/* we can't be locked to it */
7176			*locked = 0;
7177			stcb->asoc.locked_on_sending = NULL;
7178			if (send_lock_up) {
7179				SCTP_TCB_SEND_UNLOCK(stcb);
7180				send_lock_up = 0;
7181			}
7182			/* back to get the next msg */
7183			goto one_more_time;
7184		} else {
7185			/*
7186			 * sender just finished this but still holds a
7187			 * reference
7188			 */
7189			*locked = 1;
7190			*giveup = 1;
7191			to_move = 0;
7192			goto out_of;
7193		}
7194	} else {
7195		/* is there some to get */
7196		if (sp->length == 0) {
7197			/* no */
7198			*locked = 1;
7199			*giveup = 1;
7200			to_move = 0;
7201			goto out_of;
7202		} else if (sp->discard_rest) {
7203			if (send_lock_up == 0) {
7204				SCTP_TCB_SEND_LOCK(stcb);
7205				send_lock_up = 1;
7206			}
7207			/* Whack down the size */
7208			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7209			if ((stcb->sctp_socket != NULL) && \
7210			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7211			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7212				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7213			}
7214			if (sp->data) {
7215				sctp_m_freem(sp->data);
7216				sp->data = NULL;
7217				sp->tail_mbuf = NULL;
7218			}
7219			sp->length = 0;
7220			sp->some_taken = 1;
7221			*locked = 1;
7222			*giveup = 1;
7223			to_move = 0;
7224			goto out_of;
7225		}
7226	}
7227	some_taken = sp->some_taken;
7228	if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7229		sp->msg_is_complete = 1;
7230	}
7231re_look:
7232	length = sp->length;
7233	if (sp->msg_is_complete) {
7234		/* The message is complete */
7235		to_move = min(length, frag_point);
7236		if (to_move == length) {
7237			/* All of it fits in the MTU */
7238			if (sp->some_taken) {
7239				rcv_flags |= SCTP_DATA_LAST_FRAG;
7240				sp->put_last_out = 1;
7241			} else {
7242				rcv_flags |= SCTP_DATA_NOT_FRAG;
7243				sp->put_last_out = 1;
7244			}
7245		} else {
7246			/* Not all of it fits, we fragment */
7247			if (sp->some_taken == 0) {
7248				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7249			}
7250			sp->some_taken = 1;
7251		}
7252	} else {
7253		to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7254		if (to_move) {
7255			/*-
7256			 * We use a snapshot of length in case it
7257			 * is expanding during the compare.
7258			 */
7259			uint32_t llen;
7260
7261			llen = length;
7262			if (to_move >= llen) {
7263				to_move = llen;
7264				if (send_lock_up == 0) {
7265					/*-
7266					 * We are taking all of an incomplete msg
7267					 * thus we need a send lock.
7268					 */
7269					SCTP_TCB_SEND_LOCK(stcb);
7270					send_lock_up = 1;
7271					if (sp->msg_is_complete) {
7272						/*
7273						 * the sender finished the
7274						 * msg
7275						 */
7276						goto re_look;
7277					}
7278				}
7279			}
7280			if (sp->some_taken == 0) {
7281				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7282				sp->some_taken = 1;
7283			}
7284		} else {
7285			/* Nothing to take. */
7286			if (sp->some_taken) {
7287				*locked = 1;
7288			}
7289			*giveup = 1;
7290			to_move = 0;
7291			goto out_of;
7292		}
7293	}
7294
7295	/* If we reach here, we can copy out a chunk */
7296	sctp_alloc_a_chunk(stcb, chk);
7297	if (chk == NULL) {
7298		/* No chunk memory */
7299		*giveup = 1;
7300		to_move = 0;
7301		goto out_of;
7302	}
7303	/*
7304	 * Setup for unordered if needed by looking at the user sent info
7305	 * flags.
7306	 */
7307	if (sp->sinfo_flags & SCTP_UNORDERED) {
7308		rcv_flags |= SCTP_DATA_UNORDERED;
7309	}
7310	if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7311	    ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7312		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7313	}
7314	/* clear out the chunk before setting up */
7315	memset(chk, 0, sizeof(*chk));
7316	chk->rec.data.rcv_flags = rcv_flags;
7317
7318	if (to_move >= length) {
7319		/* we think we can steal the whole thing */
7320		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7321			SCTP_TCB_SEND_LOCK(stcb);
7322			send_lock_up = 1;
7323		}
7324		if (to_move < sp->length) {
7325			/* bail, it changed */
7326			goto dont_do_it;
7327		}
7328		chk->data = sp->data;
7329		chk->last_mbuf = sp->tail_mbuf;
7330		/* register the stealing */
7331		sp->data = sp->tail_mbuf = NULL;
7332	} else {
7333		struct mbuf *m;
7334
7335dont_do_it:
7336		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7337		chk->last_mbuf = NULL;
7338		if (chk->data == NULL) {
7339			sp->some_taken = some_taken;
7340			sctp_free_a_chunk(stcb, chk, so_locked);
7341			*bail = 1;
7342			to_move = 0;
7343			goto out_of;
7344		}
7345#ifdef SCTP_MBUF_LOGGING
7346		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7347			sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7348		}
7349#endif
7350		/* Pull off the data */
7351		m_adj(sp->data, to_move);
7352		/* Now lets work our way down and compact it */
7353		m = sp->data;
7354		while (m && (SCTP_BUF_LEN(m) == 0)) {
7355			sp->data = SCTP_BUF_NEXT(m);
7356			SCTP_BUF_NEXT(m) = NULL;
7357			if (sp->tail_mbuf == m) {
7358				/*-
7359				 * Freeing tail? TSNH since
7360				 * we supposedly were taking less
7361				 * than the sp->length.
7362				 */
7363#ifdef INVARIANTS
7364				panic("Huh, freing tail? - TSNH");
7365#else
7366				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7367				sp->tail_mbuf = sp->data = NULL;
7368				sp->length = 0;
7369#endif
7370
7371			}
7372			sctp_m_free(m);
7373			m = sp->data;
7374		}
7375	}
7376	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7377		chk->copy_by_ref = 1;
7378	} else {
7379		chk->copy_by_ref = 0;
7380	}
7381	/*
7382	 * get last_mbuf and counts of mb useage This is ugly but hopefully
7383	 * its only one mbuf.
7384	 */
7385	if (chk->last_mbuf == NULL) {
7386		chk->last_mbuf = chk->data;
7387		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7388			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7389		}
7390	}
7391	if (to_move > length) {
7392		/*- This should not happen either
7393		 * since we always lower to_move to the size
7394		 * of sp->length if its larger.
7395		 */
7396#ifdef INVARIANTS
7397		panic("Huh, how can to_move be larger?");
7398#else
7399		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7400		sp->length = 0;
7401#endif
7402	} else {
7403		atomic_subtract_int(&sp->length, to_move);
7404	}
7405	if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7406		/* Not enough room for a chunk header, get some */
7407		struct mbuf *m;
7408
7409		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7410		if (m == NULL) {
7411			/*
7412			 * we're in trouble here. _PREPEND below will free
7413			 * all the data if there is no leading space, so we
7414			 * must put the data back and restore.
7415			 */
7416			if (send_lock_up == 0) {
7417				SCTP_TCB_SEND_LOCK(stcb);
7418				send_lock_up = 1;
7419			}
7420			if (sp->data == NULL) {
7421				/* unsteal the data */
7422				sp->data = chk->data;
7423				sp->tail_mbuf = chk->last_mbuf;
7424			} else {
7425				struct mbuf *m_tmp;
7426
7427				/* reassemble the data */
7428				m_tmp = sp->data;
7429				sp->data = chk->data;
7430				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7431			}
7432			sp->some_taken = some_taken;
7433			atomic_add_int(&sp->length, to_move);
7434			chk->data = NULL;
7435			*bail = 1;
7436			sctp_free_a_chunk(stcb, chk, so_locked);
7437			to_move = 0;
7438			goto out_of;
7439		} else {
7440			SCTP_BUF_LEN(m) = 0;
7441			SCTP_BUF_NEXT(m) = chk->data;
7442			chk->data = m;
7443			M_ALIGN(chk->data, 4);
7444		}
7445	}
7446	SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7447	if (chk->data == NULL) {
7448		/* HELP, TSNH since we assured it would not above? */
7449#ifdef INVARIANTS
7450		panic("prepend failes HELP?");
7451#else
7452		SCTP_PRINTF("prepend fails HELP?\n");
7453		sctp_free_a_chunk(stcb, chk, so_locked);
7454#endif
7455		*bail = 1;
7456		to_move = 0;
7457		goto out_of;
7458	}
7459	sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7460	chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7461	chk->book_size_scale = 0;
7462	chk->sent = SCTP_DATAGRAM_UNSENT;
7463
7464	chk->flags = 0;
7465	chk->asoc = &stcb->asoc;
7466	chk->pad_inplace = 0;
7467	chk->no_fr_allowed = 0;
7468	chk->rec.data.stream_seq = strq->next_sequence_send;
7469	if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7470	    !(rcv_flags & SCTP_DATA_UNORDERED)) {
7471		strq->next_sequence_send++;
7472	}
7473	chk->rec.data.stream_number = sp->stream;
7474	chk->rec.data.payloadtype = sp->ppid;
7475	chk->rec.data.context = sp->context;
7476	chk->rec.data.doing_fast_retransmit = 0;
7477
7478	chk->rec.data.timetodrop = sp->ts;
7479	chk->flags = sp->act_flags;
7480
7481	if (sp->net) {
7482		chk->whoTo = sp->net;
7483		atomic_add_int(&chk->whoTo->ref_count, 1);
7484	} else
7485		chk->whoTo = NULL;
7486
7487	if (sp->holds_key_ref) {
7488		chk->auth_keyid = sp->auth_keyid;
7489		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7490		chk->holds_key_ref = 1;
7491	}
7492	chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7493	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7494		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7495		    (uintptr_t) stcb, sp->length,
7496		    (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7497		    chk->rec.data.TSN_seq);
7498	}
7499	dchkh = mtod(chk->data, struct sctp_data_chunk *);
7500	/*
7501	 * Put the rest of the things in place now. Size was done earlier in
7502	 * previous loop prior to padding.
7503	 */
7504
7505#ifdef SCTP_ASOCLOG_OF_TSNS
7506	SCTP_TCB_LOCK_ASSERT(stcb);
7507	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7508		asoc->tsn_out_at = 0;
7509		asoc->tsn_out_wrapped = 1;
7510	}
7511	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7512	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7513	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7514	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7515	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7516	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7517	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7518	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7519	asoc->tsn_out_at++;
7520#endif
7521
7522	dchkh->ch.chunk_type = SCTP_DATA;
7523	dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7524	dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7525	dchkh->dp.stream_id = htons(strq->stream_no);
7526	dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7527	dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7528	dchkh->ch.chunk_length = htons(chk->send_size);
7529	/* Now advance the chk->send_size by the actual pad needed. */
7530	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7531		/* need a pad */
7532		struct mbuf *lm;
7533		int pads;
7534
7535		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7536		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7537		if (lm != NULL) {
7538			chk->last_mbuf = lm;
7539			chk->pad_inplace = 1;
7540		}
7541		chk->send_size += pads;
7542	}
7543	if (PR_SCTP_ENABLED(chk->flags)) {
7544		asoc->pr_sctp_cnt++;
7545	}
7546	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7547		/* All done pull and kill the message */
7548		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7549		if (sp->put_last_out == 0) {
7550			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7551			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7552			    sp->sender_all_done,
7553			    sp->length,
7554			    sp->msg_is_complete,
7555			    sp->put_last_out,
7556			    send_lock_up);
7557		}
7558		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7559			SCTP_TCB_SEND_LOCK(stcb);
7560			send_lock_up = 1;
7561		}
7562		TAILQ_REMOVE(&strq->outqueue, sp, next);
7563		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7564		if (sp->net) {
7565			sctp_free_remote_addr(sp->net);
7566			sp->net = NULL;
7567		}
7568		if (sp->data) {
7569			sctp_m_freem(sp->data);
7570			sp->data = NULL;
7571		}
7572		sctp_free_a_strmoq(stcb, sp, so_locked);
7573
7574		/* we can't be locked to it */
7575		*locked = 0;
7576		stcb->asoc.locked_on_sending = NULL;
7577	} else {
7578		/* more to go, we are locked */
7579		*locked = 1;
7580	}
7581	asoc->chunks_on_out_queue++;
7582	strq->chunks_on_queues++;
7583	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7584	asoc->send_queue_cnt++;
7585out_of:
7586	if (send_lock_up) {
7587		SCTP_TCB_SEND_UNLOCK(stcb);
7588	}
7589	return (to_move);
7590}
7591
7592
7593static void
7594sctp_fill_outqueue(struct sctp_tcb *stcb,
7595    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7596#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7597    SCTP_UNUSED
7598#endif
7599)
7600{
7601	struct sctp_association *asoc;
7602	struct sctp_stream_out *strq;
7603	int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7604	int locked, giveup;
7605
7606	SCTP_TCB_LOCK_ASSERT(stcb);
7607	asoc = &stcb->asoc;
7608	switch (net->ro._l_addr.sa.sa_family) {
7609#ifdef INET
7610	case AF_INET:
7611		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7612		break;
7613#endif
7614#ifdef INET6
7615	case AF_INET6:
7616		goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7617		break;
7618#endif
7619	default:
7620		/* TSNH */
7621		goal_mtu = net->mtu;
7622		break;
7623	}
7624	/* Need an allowance for the data chunk header too */
7625	goal_mtu -= sizeof(struct sctp_data_chunk);
7626
7627	/* must make even word boundary */
7628	goal_mtu &= 0xfffffffc;
7629	if (asoc->locked_on_sending) {
7630		/* We are stuck on one stream until the message completes. */
7631		strq = asoc->locked_on_sending;
7632		locked = 1;
7633	} else {
7634		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7635		locked = 0;
7636	}
7637	while ((goal_mtu > 0) && strq) {
7638		giveup = 0;
7639		bail = 0;
7640		moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7641		    &giveup, eeor_mode, &bail, so_locked);
7642		if (moved_how_much)
7643			stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7644
7645		if (locked) {
7646			asoc->locked_on_sending = strq;
7647			if ((moved_how_much == 0) || (giveup) || bail)
7648				/* no more to move for now */
7649				break;
7650		} else {
7651			asoc->locked_on_sending = NULL;
7652			if ((giveup) || bail) {
7653				break;
7654			}
7655			strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7656			if (strq == NULL) {
7657				break;
7658			}
7659		}
7660		total_moved += moved_how_much;
7661		goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7662		goal_mtu &= 0xfffffffc;
7663	}
7664	if (bail)
7665		*quit_now = 1;
7666
7667	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7668
7669	if (total_moved == 0) {
7670		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7671		    (net == stcb->asoc.primary_destination)) {
7672			/* ran dry for primary network net */
7673			SCTP_STAT_INCR(sctps_primary_randry);
7674		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7675			/* ran dry with CMT on */
7676			SCTP_STAT_INCR(sctps_cmt_randry);
7677		}
7678	}
7679}
7680
7681void
7682sctp_fix_ecn_echo(struct sctp_association *asoc)
7683{
7684	struct sctp_tmit_chunk *chk;
7685
7686	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7687		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7688			chk->sent = SCTP_DATAGRAM_UNSENT;
7689		}
7690	}
7691}
7692
7693void
7694sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7695{
7696	struct sctp_association *asoc;
7697	struct sctp_tmit_chunk *chk;
7698	struct sctp_stream_queue_pending *sp;
7699	unsigned int i;
7700
7701	if (net == NULL) {
7702		return;
7703	}
7704	asoc = &stcb->asoc;
7705	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7706		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7707			if (sp->net == net) {
7708				sctp_free_remote_addr(sp->net);
7709				sp->net = NULL;
7710			}
7711		}
7712	}
7713	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7714		if (chk->whoTo == net) {
7715			sctp_free_remote_addr(chk->whoTo);
7716			chk->whoTo = NULL;
7717		}
7718	}
7719}
7720
7721int
7722sctp_med_chunk_output(struct sctp_inpcb *inp,
7723    struct sctp_tcb *stcb,
7724    struct sctp_association *asoc,
7725    int *num_out,
7726    int *reason_code,
7727    int control_only, int from_where,
7728    struct timeval *now, int *now_filled, int frag_point, int so_locked
7729#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7730    SCTP_UNUSED
7731#endif
7732)
7733{
7734	/**
7735	 * Ok this is the generic chunk service queue. we must do the
7736	 * following: - Service the stream queue that is next, moving any
7737	 * message (note I must get a complete message i.e. FIRST/MIDDLE and
7738	 * LAST to the out queue in one pass) and assigning TSN's - Check to
7739	 * see if the cwnd/rwnd allows any output, if so we go ahead and
7740	 * fomulate and send the low level chunks. Making sure to combine
7741	 * any control in the control chunk queue also.
7742	 */
7743	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7744	struct mbuf *outchain, *endoutchain;
7745	struct sctp_tmit_chunk *chk, *nchk;
7746
7747	/* temp arrays for unlinking */
7748	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7749	int no_fragmentflg, error;
7750	unsigned int max_rwnd_per_dest, max_send_per_dest;
7751	int one_chunk, hbflag, skip_data_for_this_net;
7752	int asconf, cookie, no_out_cnt;
7753	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7754	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7755	int tsns_sent = 0;
7756	uint32_t auth_offset = 0;
7757	struct sctp_auth_chunk *auth = NULL;
7758	uint16_t auth_keyid;
7759	int override_ok = 1;
7760	int skip_fill_up = 0;
7761	int data_auth_reqd = 0;
7762
7763	/*
7764	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7765	 * destination.
7766	 */
7767	int quit_now = 0;
7768
7769	*num_out = 0;
7770	*reason_code = 0;
7771	auth_keyid = stcb->asoc.authinfo.active_keyid;
7772	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7773	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7774	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7775		eeor_mode = 1;
7776	} else {
7777		eeor_mode = 0;
7778	}
7779	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7780	/*
7781	 * First lets prime the pump. For each destination, if there is room
7782	 * in the flight size, attempt to pull an MTU's worth out of the
7783	 * stream queues into the general send_queue
7784	 */
7785#ifdef SCTP_AUDITING_ENABLED
7786	sctp_audit_log(0xC2, 2);
7787#endif
7788	SCTP_TCB_LOCK_ASSERT(stcb);
7789	hbflag = 0;
7790	if ((control_only) || (asoc->stream_reset_outstanding))
7791		no_data_chunks = 1;
7792	else
7793		no_data_chunks = 0;
7794
7795	/* Nothing to possible to send? */
7796	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7797	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7798	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7799	    TAILQ_EMPTY(&asoc->send_queue) &&
7800	    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7801nothing_to_send:
7802		*reason_code = 9;
7803		return (0);
7804	}
7805	if (asoc->peers_rwnd == 0) {
7806		/* No room in peers rwnd */
7807		*reason_code = 1;
7808		if (asoc->total_flight > 0) {
7809			/* we are allowed one chunk in flight */
7810			no_data_chunks = 1;
7811		}
7812	}
7813	if (stcb->asoc.ecn_echo_cnt_onq) {
7814		/* Record where a sack goes, if any */
7815		if (no_data_chunks &&
7816		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7817			/* Nothing but ECNe to send - we don't do that */
7818			goto nothing_to_send;
7819		}
7820		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7821			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7822			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7823				sack_goes_to = chk->whoTo;
7824				break;
7825			}
7826		}
7827	}
7828	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7829	if (stcb->sctp_socket)
7830		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7831	else
7832		max_send_per_dest = 0;
7833	if (no_data_chunks == 0) {
7834		/* How many non-directed chunks are there? */
7835		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7836			if (chk->whoTo == NULL) {
7837				/*
7838				 * We already have non-directed chunks on
7839				 * the queue, no need to do a fill-up.
7840				 */
7841				skip_fill_up = 1;
7842				break;
7843			}
7844		}
7845
7846	}
7847	if ((no_data_chunks == 0) &&
7848	    (skip_fill_up == 0) &&
7849	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7850		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7851			/*
7852			 * This for loop we are in takes in each net, if
7853			 * its's got space in cwnd and has data sent to it
7854			 * (when CMT is off) then it calls
7855			 * sctp_fill_outqueue for the net. This gets data on
7856			 * the send queue for that network.
7857			 *
7858			 * In sctp_fill_outqueue TSN's are assigned and data is
7859			 * copied out of the stream buffers. Note mostly
7860			 * copy by reference (we hope).
7861			 */
7862			net->window_probe = 0;
7863			if ((net != stcb->asoc.alternate) &&
7864			    ((net->dest_state & SCTP_ADDR_PF) ||
7865			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7866			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7867				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7868					sctp_log_cwnd(stcb, net, 1,
7869					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7870				}
7871				continue;
7872			}
7873			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7874			    (net->flight_size == 0)) {
7875				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7876			}
7877			if (net->flight_size >= net->cwnd) {
7878				/* skip this network, no room - can't fill */
7879				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7880					sctp_log_cwnd(stcb, net, 3,
7881					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7882				}
7883				continue;
7884			}
7885			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7886				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7887			}
7888			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7889			if (quit_now) {
7890				/* memory alloc failure */
7891				no_data_chunks = 1;
7892				break;
7893			}
7894		}
7895	}
7896	/* now service each destination and send out what we can for it */
7897	/* Nothing to send? */
7898	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7899	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7900	    TAILQ_EMPTY(&asoc->send_queue)) {
7901		*reason_code = 8;
7902		return (0);
7903	}
7904	if (asoc->sctp_cmt_on_off > 0) {
7905		/* get the last start point */
7906		start_at = asoc->last_net_cmt_send_started;
7907		if (start_at == NULL) {
7908			/* null so to beginning */
7909			start_at = TAILQ_FIRST(&asoc->nets);
7910		} else {
7911			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7912			if (start_at == NULL) {
7913				start_at = TAILQ_FIRST(&asoc->nets);
7914			}
7915		}
7916		asoc->last_net_cmt_send_started = start_at;
7917	} else {
7918		start_at = TAILQ_FIRST(&asoc->nets);
7919	}
7920	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7921		if (chk->whoTo == NULL) {
7922			if (asoc->alternate) {
7923				chk->whoTo = asoc->alternate;
7924			} else {
7925				chk->whoTo = asoc->primary_destination;
7926			}
7927			atomic_add_int(&chk->whoTo->ref_count, 1);
7928		}
7929	}
7930	old_start_at = NULL;
7931again_one_more_time:
7932	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7933		/* how much can we send? */
7934		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7935		if (old_start_at && (old_start_at == net)) {
7936			/* through list ocmpletely. */
7937			break;
7938		}
7939		tsns_sent = 0xa;
7940		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7941		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7942		    (net->flight_size >= net->cwnd)) {
7943			/*
7944			 * Nothing on control or asconf and flight is full,
7945			 * we can skip even in the CMT case.
7946			 */
7947			continue;
7948		}
7949		bundle_at = 0;
7950		endoutchain = outchain = NULL;
7951		no_fragmentflg = 1;
7952		one_chunk = 0;
7953		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7954			skip_data_for_this_net = 1;
7955		} else {
7956			skip_data_for_this_net = 0;
7957		}
7958		if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7959			/*
7960			 * if we have a route and an ifp check to see if we
7961			 * have room to send to this guy
7962			 */
7963			struct ifnet *ifp;
7964
7965			ifp = net->ro.ro_rt->rt_ifp;
7966			if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7967				SCTP_STAT_INCR(sctps_ifnomemqueued);
7968				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7969					sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7970				}
7971				continue;
7972			}
7973		}
7974		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7975#ifdef INET
7976		case AF_INET:
7977			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7978			break;
7979#endif
7980#ifdef INET6
7981		case AF_INET6:
7982			mtu = net->mtu - SCTP_MIN_OVERHEAD;
7983			break;
7984#endif
7985		default:
7986			/* TSNH */
7987			mtu = net->mtu;
7988			break;
7989		}
7990		mx_mtu = mtu;
7991		to_out = 0;
7992		if (mtu > asoc->peers_rwnd) {
7993			if (asoc->total_flight > 0) {
7994				/* We have a packet in flight somewhere */
7995				r_mtu = asoc->peers_rwnd;
7996			} else {
7997				/* We are always allowed to send one MTU out */
7998				one_chunk = 1;
7999				r_mtu = mtu;
8000			}
8001		} else {
8002			r_mtu = mtu;
8003		}
8004		error = 0;
8005		/************************/
8006		/* ASCONF transmission */
8007		/************************/
8008		/* Now first lets go through the asconf queue */
8009		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8010			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8011				continue;
8012			}
8013			if (chk->whoTo == NULL) {
8014				if (asoc->alternate == NULL) {
8015					if (asoc->primary_destination != net) {
8016						break;
8017					}
8018				} else {
8019					if (asoc->alternate != net) {
8020						break;
8021					}
8022				}
8023			} else {
8024				if (chk->whoTo != net) {
8025					break;
8026				}
8027			}
8028			if (chk->data == NULL) {
8029				break;
8030			}
8031			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8032			    chk->sent != SCTP_DATAGRAM_RESEND) {
8033				break;
8034			}
8035			/*
8036			 * if no AUTH is yet included and this chunk
8037			 * requires it, make sure to account for it.  We
8038			 * don't apply the size until the AUTH chunk is
8039			 * actually added below in case there is no room for
8040			 * this chunk. NOTE: we overload the use of "omtu"
8041			 * here
8042			 */
8043			if ((auth == NULL) &&
8044			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8045			    stcb->asoc.peer_auth_chunks)) {
8046				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8047			} else
8048				omtu = 0;
8049			/* Here we do NOT factor the r_mtu */
8050			if ((chk->send_size < (int)(mtu - omtu)) ||
8051			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8052				/*
8053				 * We probably should glom the mbuf chain
8054				 * from the chk->data for control but the
8055				 * problem is it becomes yet one more level
8056				 * of tracking to do if for some reason
8057				 * output fails. Then I have got to
8058				 * reconstruct the merged control chain.. el
8059				 * yucko.. for now we take the easy way and
8060				 * do the copy
8061				 */
8062				/*
8063				 * Add an AUTH chunk, if chunk requires it
8064				 * save the offset into the chain for AUTH
8065				 */
8066				if ((auth == NULL) &&
8067				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8068				    stcb->asoc.peer_auth_chunks))) {
8069					outchain = sctp_add_auth_chunk(outchain,
8070					    &endoutchain,
8071					    &auth,
8072					    &auth_offset,
8073					    stcb,
8074					    chk->rec.chunk_id.id);
8075					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8076				}
8077				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8078				    (int)chk->rec.chunk_id.can_take_data,
8079				    chk->send_size, chk->copy_by_ref);
8080				if (outchain == NULL) {
8081					*reason_code = 8;
8082					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8083					return (ENOMEM);
8084				}
8085				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8086				/* update our MTU size */
8087				if (mtu > (chk->send_size + omtu))
8088					mtu -= (chk->send_size + omtu);
8089				else
8090					mtu = 0;
8091				to_out += (chk->send_size + omtu);
8092				/* Do clear IP_DF ? */
8093				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8094					no_fragmentflg = 0;
8095				}
8096				if (chk->rec.chunk_id.can_take_data)
8097					chk->data = NULL;
8098				/*
8099				 * set hb flag since we can use these for
8100				 * RTO
8101				 */
8102				hbflag = 1;
8103				asconf = 1;
8104				/*
8105				 * should sysctl this: don't bundle data
8106				 * with ASCONF since it requires AUTH
8107				 */
8108				no_data_chunks = 1;
8109				chk->sent = SCTP_DATAGRAM_SENT;
8110				if (chk->whoTo == NULL) {
8111					chk->whoTo = net;
8112					atomic_add_int(&net->ref_count, 1);
8113				}
8114				chk->snd_count++;
8115				if (mtu == 0) {
8116					/*
8117					 * Ok we are out of room but we can
8118					 * output without effecting the
8119					 * flight size since this little guy
8120					 * is a control only packet.
8121					 */
8122					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8123					/*
8124					 * do NOT clear the asconf flag as
8125					 * it is used to do appropriate
8126					 * source address selection.
8127					 */
8128					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8129					    (struct sockaddr *)&net->ro._l_addr,
8130					    outchain, auth_offset, auth,
8131					    stcb->asoc.authinfo.active_keyid,
8132					    no_fragmentflg, 0, asconf,
8133					    inp->sctp_lport, stcb->rport,
8134					    htonl(stcb->asoc.peer_vtag),
8135					    net->port, NULL,
8136					    0, 0,
8137					    so_locked))) {
8138						if (error == ENOBUFS) {
8139							asoc->ifp_had_enobuf = 1;
8140							SCTP_STAT_INCR(sctps_lowlevelerr);
8141						}
8142						if (from_where == 0) {
8143							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8144						}
8145						if (*now_filled == 0) {
8146							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8147							*now_filled = 1;
8148							*now = net->last_sent_time;
8149						} else {
8150							net->last_sent_time = *now;
8151						}
8152						hbflag = 0;
8153						/* error, could not output */
8154						if (error == EHOSTUNREACH) {
8155							/*
8156							 * Destination went
8157							 * unreachable
8158							 * during this send
8159							 */
8160							sctp_move_chunks_from_net(stcb, net);
8161						}
8162						*reason_code = 7;
8163						break;
8164					} else
8165						asoc->ifp_had_enobuf = 0;
8166					if (*now_filled == 0) {
8167						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8168						*now_filled = 1;
8169						*now = net->last_sent_time;
8170					} else {
8171						net->last_sent_time = *now;
8172					}
8173					hbflag = 0;
8174					/*
8175					 * increase the number we sent, if a
8176					 * cookie is sent we don't tell them
8177					 * any was sent out.
8178					 */
8179					outchain = endoutchain = NULL;
8180					auth = NULL;
8181					auth_offset = 0;
8182					if (!no_out_cnt)
8183						*num_out += ctl_cnt;
8184					/* recalc a clean slate and setup */
8185					switch (net->ro._l_addr.sa.sa_family) {
8186#ifdef INET
8187					case AF_INET:
8188						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8189						break;
8190#endif
8191#ifdef INET6
8192					case AF_INET6:
8193						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8194						break;
8195#endif
8196					default:
8197						/* TSNH */
8198						mtu = net->mtu;
8199						break;
8200					}
8201					to_out = 0;
8202					no_fragmentflg = 1;
8203				}
8204			}
8205		}
8206		if (error != 0) {
8207			/* try next net */
8208			continue;
8209		}
8210		/************************/
8211		/* Control transmission */
8212		/************************/
8213		/* Now first lets go through the control queue */
8214		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8215			if ((sack_goes_to) &&
8216			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8217			    (chk->whoTo != sack_goes_to)) {
8218				/*
8219				 * if we have a sack in queue, and we are
8220				 * looking at an ecn echo that is NOT queued
8221				 * to where the sack is going..
8222				 */
8223				if (chk->whoTo == net) {
8224					/*
8225					 * Don't transmit it to where its
8226					 * going (current net)
8227					 */
8228					continue;
8229				} else if (sack_goes_to == net) {
8230					/*
8231					 * But do transmit it to this
8232					 * address
8233					 */
8234					goto skip_net_check;
8235				}
8236			}
8237			if (chk->whoTo == NULL) {
8238				if (asoc->alternate == NULL) {
8239					if (asoc->primary_destination != net) {
8240						continue;
8241					}
8242				} else {
8243					if (asoc->alternate != net) {
8244						continue;
8245					}
8246				}
8247			} else {
8248				if (chk->whoTo != net) {
8249					continue;
8250				}
8251			}
8252	skip_net_check:
8253			if (chk->data == NULL) {
8254				continue;
8255			}
8256			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8257				/*
8258				 * It must be unsent. Cookies and ASCONF's
8259				 * hang around but there timers will force
8260				 * when marked for resend.
8261				 */
8262				continue;
8263			}
8264			/*
8265			 * if no AUTH is yet included and this chunk
8266			 * requires it, make sure to account for it.  We
8267			 * don't apply the size until the AUTH chunk is
8268			 * actually added below in case there is no room for
8269			 * this chunk. NOTE: we overload the use of "omtu"
8270			 * here
8271			 */
8272			if ((auth == NULL) &&
8273			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8274			    stcb->asoc.peer_auth_chunks)) {
8275				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8276			} else
8277				omtu = 0;
8278			/* Here we do NOT factor the r_mtu */
8279			if ((chk->send_size <= (int)(mtu - omtu)) ||
8280			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8281				/*
8282				 * We probably should glom the mbuf chain
8283				 * from the chk->data for control but the
8284				 * problem is it becomes yet one more level
8285				 * of tracking to do if for some reason
8286				 * output fails. Then I have got to
8287				 * reconstruct the merged control chain.. el
8288				 * yucko.. for now we take the easy way and
8289				 * do the copy
8290				 */
8291				/*
8292				 * Add an AUTH chunk, if chunk requires it
8293				 * save the offset into the chain for AUTH
8294				 */
8295				if ((auth == NULL) &&
8296				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8297				    stcb->asoc.peer_auth_chunks))) {
8298					outchain = sctp_add_auth_chunk(outchain,
8299					    &endoutchain,
8300					    &auth,
8301					    &auth_offset,
8302					    stcb,
8303					    chk->rec.chunk_id.id);
8304					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8305				}
8306				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8307				    (int)chk->rec.chunk_id.can_take_data,
8308				    chk->send_size, chk->copy_by_ref);
8309				if (outchain == NULL) {
8310					*reason_code = 8;
8311					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8312					return (ENOMEM);
8313				}
8314				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8315				/* update our MTU size */
8316				if (mtu > (chk->send_size + omtu))
8317					mtu -= (chk->send_size + omtu);
8318				else
8319					mtu = 0;
8320				to_out += (chk->send_size + omtu);
8321				/* Do clear IP_DF ? */
8322				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8323					no_fragmentflg = 0;
8324				}
8325				if (chk->rec.chunk_id.can_take_data)
8326					chk->data = NULL;
8327				/* Mark things to be removed, if needed */
8328				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8329				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8330				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8331				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8332				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8333				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8334				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8335				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8336				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8337				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8338				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8339					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8340						hbflag = 1;
8341					}
8342					/* remove these chunks at the end */
8343					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8344					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8345						/* turn off the timer */
8346						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8347							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8348							    inp, stcb, net,
8349							    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8350						}
8351					}
8352					ctl_cnt++;
8353				} else {
8354					/*
8355					 * Other chunks, since they have
8356					 * timers running (i.e. COOKIE) we
8357					 * just "trust" that it gets sent or
8358					 * retransmitted.
8359					 */
8360					ctl_cnt++;
8361					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8362						cookie = 1;
8363						no_out_cnt = 1;
8364					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8365						/*
8366						 * Increment ecne send count
8367						 * here this means we may be
8368						 * over-zealous in our
8369						 * counting if the send
8370						 * fails, but its the best
8371						 * place to do it (we used
8372						 * to do it in the queue of
8373						 * the chunk, but that did
8374						 * not tell how many times
8375						 * it was sent.
8376						 */
8377						SCTP_STAT_INCR(sctps_sendecne);
8378					}
8379					chk->sent = SCTP_DATAGRAM_SENT;
8380					if (chk->whoTo == NULL) {
8381						chk->whoTo = net;
8382						atomic_add_int(&net->ref_count, 1);
8383					}
8384					chk->snd_count++;
8385				}
8386				if (mtu == 0) {
8387					/*
8388					 * Ok we are out of room but we can
8389					 * output without effecting the
8390					 * flight size since this little guy
8391					 * is a control only packet.
8392					 */
8393					if (asconf) {
8394						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8395						/*
8396						 * do NOT clear the asconf
8397						 * flag as it is used to do
8398						 * appropriate source
8399						 * address selection.
8400						 */
8401					}
8402					if (cookie) {
8403						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8404						cookie = 0;
8405					}
8406					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8407					    (struct sockaddr *)&net->ro._l_addr,
8408					    outchain,
8409					    auth_offset, auth,
8410					    stcb->asoc.authinfo.active_keyid,
8411					    no_fragmentflg, 0, asconf,
8412					    inp->sctp_lport, stcb->rport,
8413					    htonl(stcb->asoc.peer_vtag),
8414					    net->port, NULL,
8415					    0, 0,
8416					    so_locked))) {
8417						if (error == ENOBUFS) {
8418							asoc->ifp_had_enobuf = 1;
8419							SCTP_STAT_INCR(sctps_lowlevelerr);
8420						}
8421						if (from_where == 0) {
8422							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8423						}
8424						/* error, could not output */
8425						if (hbflag) {
8426							if (*now_filled == 0) {
8427								(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8428								*now_filled = 1;
8429								*now = net->last_sent_time;
8430							} else {
8431								net->last_sent_time = *now;
8432							}
8433							hbflag = 0;
8434						}
8435						if (error == EHOSTUNREACH) {
8436							/*
8437							 * Destination went
8438							 * unreachable
8439							 * during this send
8440							 */
8441							sctp_move_chunks_from_net(stcb, net);
8442						}
8443						*reason_code = 7;
8444						break;
8445					} else
8446						asoc->ifp_had_enobuf = 0;
8447					/* Only HB or ASCONF advances time */
8448					if (hbflag) {
8449						if (*now_filled == 0) {
8450							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8451							*now_filled = 1;
8452							*now = net->last_sent_time;
8453						} else {
8454							net->last_sent_time = *now;
8455						}
8456						hbflag = 0;
8457					}
8458					/*
8459					 * increase the number we sent, if a
8460					 * cookie is sent we don't tell them
8461					 * any was sent out.
8462					 */
8463					outchain = endoutchain = NULL;
8464					auth = NULL;
8465					auth_offset = 0;
8466					if (!no_out_cnt)
8467						*num_out += ctl_cnt;
8468					/* recalc a clean slate and setup */
8469					switch (net->ro._l_addr.sa.sa_family) {
8470#ifdef INET
8471					case AF_INET:
8472						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8473						break;
8474#endif
8475#ifdef INET6
8476					case AF_INET6:
8477						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8478						break;
8479#endif
8480					default:
8481						/* TSNH */
8482						mtu = net->mtu;
8483						break;
8484					}
8485					to_out = 0;
8486					no_fragmentflg = 1;
8487				}
8488			}
8489		}
8490		if (error != 0) {
8491			/* try next net */
8492			continue;
8493		}
8494		/* JRI: if dest is in PF state, do not send data to it */
8495		if ((asoc->sctp_cmt_on_off > 0) &&
8496		    (net != stcb->asoc.alternate) &&
8497		    (net->dest_state & SCTP_ADDR_PF)) {
8498			goto no_data_fill;
8499		}
8500		if (net->flight_size >= net->cwnd) {
8501			goto no_data_fill;
8502		}
8503		if ((asoc->sctp_cmt_on_off > 0) &&
8504		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8505		    (net->flight_size > max_rwnd_per_dest)) {
8506			goto no_data_fill;
8507		}
8508		/*
8509		 * We need a specific accounting for the usage of the send
8510		 * buffer. We also need to check the number of messages per
8511		 * net. For now, this is better than nothing and it disabled
8512		 * by default...
8513		 */
8514		if ((asoc->sctp_cmt_on_off > 0) &&
8515		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8516		    (max_send_per_dest > 0) &&
8517		    (net->flight_size > max_send_per_dest)) {
8518			goto no_data_fill;
8519		}
8520		/*********************/
8521		/* Data transmission */
8522		/*********************/
8523		/*
8524		 * if AUTH for DATA is required and no AUTH has been added
8525		 * yet, account for this in the mtu now... if no data can be
8526		 * bundled, this adjustment won't matter anyways since the
8527		 * packet will be going out...
8528		 */
8529		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8530		    stcb->asoc.peer_auth_chunks);
8531		if (data_auth_reqd && (auth == NULL)) {
8532			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8533		}
8534		/* now lets add any data within the MTU constraints */
8535		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8536#ifdef INET
8537		case AF_INET:
8538			if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8539				omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8540			else
8541				omtu = 0;
8542			break;
8543#endif
8544#ifdef INET6
8545		case AF_INET6:
8546			if (net->mtu > SCTP_MIN_OVERHEAD)
8547				omtu = net->mtu - SCTP_MIN_OVERHEAD;
8548			else
8549				omtu = 0;
8550			break;
8551#endif
8552		default:
8553			/* TSNH */
8554			omtu = 0;
8555			break;
8556		}
8557		if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8558		    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8559		    (skip_data_for_this_net == 0)) ||
8560		    (cookie)) {
8561			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8562				if (no_data_chunks) {
8563					/* let only control go out */
8564					*reason_code = 1;
8565					break;
8566				}
8567				if (net->flight_size >= net->cwnd) {
8568					/* skip this net, no room for data */
8569					*reason_code = 2;
8570					break;
8571				}
8572				if ((chk->whoTo != NULL) &&
8573				    (chk->whoTo != net)) {
8574					/* Don't send the chunk on this net */
8575					continue;
8576				}
8577				if (asoc->sctp_cmt_on_off == 0) {
8578					if ((asoc->alternate) &&
8579					    (asoc->alternate != net) &&
8580					    (chk->whoTo == NULL)) {
8581						continue;
8582					} else if ((net != asoc->primary_destination) &&
8583						    (asoc->alternate == NULL) &&
8584					    (chk->whoTo == NULL)) {
8585						continue;
8586					}
8587				}
8588				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8589					/*-
8590					 * strange, we have a chunk that is
8591					 * to big for its destination and
8592					 * yet no fragment ok flag.
8593					 * Something went wrong when the
8594					 * PMTU changed...we did not mark
8595					 * this chunk for some reason?? I
8596					 * will fix it here by letting IP
8597					 * fragment it for now and printing
8598					 * a warning. This really should not
8599					 * happen ...
8600					 */
8601					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8602					    chk->send_size, mtu);
8603					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8604				}
8605				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8606				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8607					struct sctp_data_chunk *dchkh;
8608
8609					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8610					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8611				}
8612				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8613				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8614					/* ok we will add this one */
8615
8616					/*
8617					 * Add an AUTH chunk, if chunk
8618					 * requires it, save the offset into
8619					 * the chain for AUTH
8620					 */
8621					if (data_auth_reqd) {
8622						if (auth == NULL) {
8623							outchain = sctp_add_auth_chunk(outchain,
8624							    &endoutchain,
8625							    &auth,
8626							    &auth_offset,
8627							    stcb,
8628							    SCTP_DATA);
8629							auth_keyid = chk->auth_keyid;
8630							override_ok = 0;
8631							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8632						} else if (override_ok) {
8633							/*
8634							 * use this data's
8635							 * keyid
8636							 */
8637							auth_keyid = chk->auth_keyid;
8638							override_ok = 0;
8639						} else if (auth_keyid != chk->auth_keyid) {
8640							/*
8641							 * different keyid,
8642							 * so done bundling
8643							 */
8644							break;
8645						}
8646					}
8647					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8648					    chk->send_size, chk->copy_by_ref);
8649					if (outchain == NULL) {
8650						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8651						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8652							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8653						}
8654						*reason_code = 3;
8655						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8656						return (ENOMEM);
8657					}
8658					/* upate our MTU size */
8659					/* Do clear IP_DF ? */
8660					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8661						no_fragmentflg = 0;
8662					}
8663					/* unsigned subtraction of mtu */
8664					if (mtu > chk->send_size)
8665						mtu -= chk->send_size;
8666					else
8667						mtu = 0;
8668					/* unsigned subtraction of r_mtu */
8669					if (r_mtu > chk->send_size)
8670						r_mtu -= chk->send_size;
8671					else
8672						r_mtu = 0;
8673
8674					to_out += chk->send_size;
8675					if ((to_out > mx_mtu) && no_fragmentflg) {
8676#ifdef INVARIANTS
8677						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8678#else
8679						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8680						    mx_mtu, to_out);
8681#endif
8682					}
8683					chk->window_probe = 0;
8684					data_list[bundle_at++] = chk;
8685					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8686						break;
8687					}
8688					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8689						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8690							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8691						} else {
8692							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8693						}
8694						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8695						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8696							/*
8697							 * Count number of
8698							 * user msg's that
8699							 * were fragmented
8700							 * we do this by
8701							 * counting when we
8702							 * see a LAST
8703							 * fragment only.
8704							 */
8705							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8706					}
8707					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8708						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8709							data_list[0]->window_probe = 1;
8710							net->window_probe = 1;
8711						}
8712						break;
8713					}
8714				} else {
8715					/*
8716					 * Must be sent in order of the
8717					 * TSN's (on a network)
8718					 */
8719					break;
8720				}
8721			}	/* for (chunk gather loop for this net) */
8722		}		/* if asoc.state OPEN */
8723no_data_fill:
8724		/* Is there something to send for this destination? */
8725		if (outchain) {
8726			/* We may need to start a control timer or two */
8727			if (asconf) {
8728				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8729				    stcb, net);
8730				/*
8731				 * do NOT clear the asconf flag as it is
8732				 * used to do appropriate source address
8733				 * selection.
8734				 */
8735			}
8736			if (cookie) {
8737				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8738				cookie = 0;
8739			}
8740			/* must start a send timer if data is being sent */
8741			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8742				/*
8743				 * no timer running on this destination
8744				 * restart it.
8745				 */
8746				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8747			}
8748			/* Now send it, if there is anything to send :> */
8749			if ((error = sctp_lowlevel_chunk_output(inp,
8750			    stcb,
8751			    net,
8752			    (struct sockaddr *)&net->ro._l_addr,
8753			    outchain,
8754			    auth_offset,
8755			    auth,
8756			    auth_keyid,
8757			    no_fragmentflg,
8758			    bundle_at,
8759			    asconf,
8760			    inp->sctp_lport, stcb->rport,
8761			    htonl(stcb->asoc.peer_vtag),
8762			    net->port, NULL,
8763			    0, 0,
8764			    so_locked))) {
8765				/* error, we could not output */
8766				if (error == ENOBUFS) {
8767					SCTP_STAT_INCR(sctps_lowlevelerr);
8768					asoc->ifp_had_enobuf = 1;
8769				}
8770				if (from_where == 0) {
8771					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8772				}
8773				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8774				if (hbflag) {
8775					if (*now_filled == 0) {
8776						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8777						*now_filled = 1;
8778						*now = net->last_sent_time;
8779					} else {
8780						net->last_sent_time = *now;
8781					}
8782					hbflag = 0;
8783				}
8784				if (error == EHOSTUNREACH) {
8785					/*
8786					 * Destination went unreachable
8787					 * during this send
8788					 */
8789					sctp_move_chunks_from_net(stcb, net);
8790				}
8791				*reason_code = 6;
8792				/*-
8793				 * I add this line to be paranoid. As far as
8794				 * I can tell the continue, takes us back to
8795				 * the top of the for, but just to make sure
8796				 * I will reset these again here.
8797				 */
8798				ctl_cnt = bundle_at = 0;
8799				continue;	/* This takes us back to the
8800						 * for() for the nets. */
8801			} else {
8802				asoc->ifp_had_enobuf = 0;
8803			}
8804			endoutchain = NULL;
8805			auth = NULL;
8806			auth_offset = 0;
8807			if (bundle_at || hbflag) {
8808				/* For data/asconf and hb set time */
8809				if (*now_filled == 0) {
8810					(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8811					*now_filled = 1;
8812					*now = net->last_sent_time;
8813				} else {
8814					net->last_sent_time = *now;
8815				}
8816			}
8817			if (!no_out_cnt) {
8818				*num_out += (ctl_cnt + bundle_at);
8819			}
8820			if (bundle_at) {
8821				/* setup for a RTO measurement */
8822				tsns_sent = data_list[0]->rec.data.TSN_seq;
8823				/* fill time if not already filled */
8824				if (*now_filled == 0) {
8825					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8826					*now_filled = 1;
8827					*now = asoc->time_last_sent;
8828				} else {
8829					asoc->time_last_sent = *now;
8830				}
8831				if (net->rto_needed) {
8832					data_list[0]->do_rtt = 1;
8833					net->rto_needed = 0;
8834				}
8835				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8836				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8837			}
8838			if (one_chunk) {
8839				break;
8840			}
8841		}
8842		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8843			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8844		}
8845	}
8846	if (old_start_at == NULL) {
8847		old_start_at = start_at;
8848		start_at = TAILQ_FIRST(&asoc->nets);
8849		if (old_start_at)
8850			goto again_one_more_time;
8851	}
8852	/*
8853	 * At the end there should be no NON timed chunks hanging on this
8854	 * queue.
8855	 */
8856	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8857		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8858	}
8859	if ((*num_out == 0) && (*reason_code == 0)) {
8860		*reason_code = 4;
8861	} else {
8862		*reason_code = 5;
8863	}
8864	sctp_clean_up_ctl(stcb, asoc, so_locked);
8865	return (0);
8866}
8867
8868void
8869sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8870{
8871	/*-
8872	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8873	 * the control chunk queue.
8874	 */
8875	struct sctp_chunkhdr *hdr;
8876	struct sctp_tmit_chunk *chk;
8877	struct mbuf *mat;
8878
8879	SCTP_TCB_LOCK_ASSERT(stcb);
8880	sctp_alloc_a_chunk(stcb, chk);
8881	if (chk == NULL) {
8882		/* no memory */
8883		sctp_m_freem(op_err);
8884		return;
8885	}
8886	chk->copy_by_ref = 0;
8887	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8888	if (op_err == NULL) {
8889		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8890		return;
8891	}
8892	chk->send_size = 0;
8893	for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8894		chk->send_size += SCTP_BUF_LEN(mat);
8895	}
8896	chk->sent = SCTP_DATAGRAM_UNSENT;
8897	chk->snd_count = 0;
8898	chk->asoc = &stcb->asoc;
8899	chk->data = op_err;
8900	chk->whoTo = NULL;
8901	hdr = mtod(op_err, struct sctp_chunkhdr *);
8902	hdr->chunk_type = SCTP_OPERATION_ERROR;
8903	hdr->chunk_flags = 0;
8904	hdr->chunk_length = htons(chk->send_size);
8905	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8906	    chk,
8907	    sctp_next);
8908	chk->asoc->ctrl_queue_cnt++;
8909}
8910
8911int
8912sctp_send_cookie_echo(struct mbuf *m,
8913    int offset,
8914    struct sctp_tcb *stcb,
8915    struct sctp_nets *net)
8916{
8917	/*-
8918	 * pull out the cookie and put it at the front of the control chunk
8919	 * queue.
8920	 */
8921	int at;
8922	struct mbuf *cookie;
8923	struct sctp_paramhdr parm, *phdr;
8924	struct sctp_chunkhdr *hdr;
8925	struct sctp_tmit_chunk *chk;
8926	uint16_t ptype, plen;
8927
8928	SCTP_TCB_LOCK_ASSERT(stcb);
8929	/* First find the cookie in the param area */
8930	cookie = NULL;
8931	at = offset + sizeof(struct sctp_init_chunk);
8932	for (;;) {
8933		phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8934		if (phdr == NULL) {
8935			return (-3);
8936		}
8937		ptype = ntohs(phdr->param_type);
8938		plen = ntohs(phdr->param_length);
8939		if (ptype == SCTP_STATE_COOKIE) {
8940			int pad;
8941
8942			/* found the cookie */
8943			if ((pad = (plen % 4))) {
8944				plen += 4 - pad;
8945			}
8946			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8947			if (cookie == NULL) {
8948				/* No memory */
8949				return (-2);
8950			}
8951#ifdef SCTP_MBUF_LOGGING
8952			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8953				sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8954			}
8955#endif
8956			break;
8957		}
8958		at += SCTP_SIZE32(plen);
8959	}
8960	/* ok, we got the cookie lets change it into a cookie echo chunk */
8961	/* first the change from param to cookie */
8962	hdr = mtod(cookie, struct sctp_chunkhdr *);
8963	hdr->chunk_type = SCTP_COOKIE_ECHO;
8964	hdr->chunk_flags = 0;
8965	/* get the chunk stuff now and place it in the FRONT of the queue */
8966	sctp_alloc_a_chunk(stcb, chk);
8967	if (chk == NULL) {
8968		/* no memory */
8969		sctp_m_freem(cookie);
8970		return (-5);
8971	}
8972	chk->copy_by_ref = 0;
8973	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8974	chk->rec.chunk_id.can_take_data = 0;
8975	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8976	chk->send_size = plen;
8977	chk->sent = SCTP_DATAGRAM_UNSENT;
8978	chk->snd_count = 0;
8979	chk->asoc = &stcb->asoc;
8980	chk->data = cookie;
8981	chk->whoTo = net;
8982	atomic_add_int(&chk->whoTo->ref_count, 1);
8983	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8984	chk->asoc->ctrl_queue_cnt++;
8985	return (0);
8986}
8987
8988void
8989sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8990    struct mbuf *m,
8991    int offset,
8992    int chk_length,
8993    struct sctp_nets *net)
8994{
8995	/*
8996	 * take a HB request and make it into a HB ack and send it.
8997	 */
8998	struct mbuf *outchain;
8999	struct sctp_chunkhdr *chdr;
9000	struct sctp_tmit_chunk *chk;
9001
9002
9003	if (net == NULL)
9004		/* must have a net pointer */
9005		return;
9006
9007	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9008	if (outchain == NULL) {
9009		/* gak out of memory */
9010		return;
9011	}
9012#ifdef SCTP_MBUF_LOGGING
9013	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9014		sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9015	}
9016#endif
9017	chdr = mtod(outchain, struct sctp_chunkhdr *);
9018	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9019	chdr->chunk_flags = 0;
9020	if (chk_length % 4) {
9021		/* need pad */
9022		uint32_t cpthis = 0;
9023		int padlen;
9024
9025		padlen = 4 - (chk_length % 4);
9026		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9027	}
9028	sctp_alloc_a_chunk(stcb, chk);
9029	if (chk == NULL) {
9030		/* no memory */
9031		sctp_m_freem(outchain);
9032		return;
9033	}
9034	chk->copy_by_ref = 0;
9035	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9036	chk->rec.chunk_id.can_take_data = 1;
9037	chk->flags = 0;
9038	chk->send_size = chk_length;
9039	chk->sent = SCTP_DATAGRAM_UNSENT;
9040	chk->snd_count = 0;
9041	chk->asoc = &stcb->asoc;
9042	chk->data = outchain;
9043	chk->whoTo = net;
9044	atomic_add_int(&chk->whoTo->ref_count, 1);
9045	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9046	chk->asoc->ctrl_queue_cnt++;
9047}
9048
9049void
9050sctp_send_cookie_ack(struct sctp_tcb *stcb)
9051{
9052	/* formulate and queue a cookie-ack back to sender */
9053	struct mbuf *cookie_ack;
9054	struct sctp_chunkhdr *hdr;
9055	struct sctp_tmit_chunk *chk;
9056
9057	SCTP_TCB_LOCK_ASSERT(stcb);
9058
9059	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9060	if (cookie_ack == NULL) {
9061		/* no mbuf's */
9062		return;
9063	}
9064	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9065	sctp_alloc_a_chunk(stcb, chk);
9066	if (chk == NULL) {
9067		/* no memory */
9068		sctp_m_freem(cookie_ack);
9069		return;
9070	}
9071	chk->copy_by_ref = 0;
9072	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9073	chk->rec.chunk_id.can_take_data = 1;
9074	chk->flags = 0;
9075	chk->send_size = sizeof(struct sctp_chunkhdr);
9076	chk->sent = SCTP_DATAGRAM_UNSENT;
9077	chk->snd_count = 0;
9078	chk->asoc = &stcb->asoc;
9079	chk->data = cookie_ack;
9080	if (chk->asoc->last_control_chunk_from != NULL) {
9081		chk->whoTo = chk->asoc->last_control_chunk_from;
9082		atomic_add_int(&chk->whoTo->ref_count, 1);
9083	} else {
9084		chk->whoTo = NULL;
9085	}
9086	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9087	hdr->chunk_type = SCTP_COOKIE_ACK;
9088	hdr->chunk_flags = 0;
9089	hdr->chunk_length = htons(chk->send_size);
9090	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9091	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9092	chk->asoc->ctrl_queue_cnt++;
9093	return;
9094}
9095
9096
9097void
9098sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9099{
9100	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9101	struct mbuf *m_shutdown_ack;
9102	struct sctp_shutdown_ack_chunk *ack_cp;
9103	struct sctp_tmit_chunk *chk;
9104
9105	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9106	if (m_shutdown_ack == NULL) {
9107		/* no mbuf's */
9108		return;
9109	}
9110	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9111	sctp_alloc_a_chunk(stcb, chk);
9112	if (chk == NULL) {
9113		/* no memory */
9114		sctp_m_freem(m_shutdown_ack);
9115		return;
9116	}
9117	chk->copy_by_ref = 0;
9118	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9119	chk->rec.chunk_id.can_take_data = 1;
9120	chk->flags = 0;
9121	chk->send_size = sizeof(struct sctp_chunkhdr);
9122	chk->sent = SCTP_DATAGRAM_UNSENT;
9123	chk->snd_count = 0;
9124	chk->flags = 0;
9125	chk->asoc = &stcb->asoc;
9126	chk->data = m_shutdown_ack;
9127	chk->whoTo = net;
9128	if (chk->whoTo) {
9129		atomic_add_int(&chk->whoTo->ref_count, 1);
9130	}
9131	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9132	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9133	ack_cp->ch.chunk_flags = 0;
9134	ack_cp->ch.chunk_length = htons(chk->send_size);
9135	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9136	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9137	chk->asoc->ctrl_queue_cnt++;
9138	return;
9139}
9140
9141void
9142sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9143{
9144	/* formulate and queue a SHUTDOWN to the sender */
9145	struct mbuf *m_shutdown;
9146	struct sctp_shutdown_chunk *shutdown_cp;
9147	struct sctp_tmit_chunk *chk;
9148
9149	m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9150	if (m_shutdown == NULL) {
9151		/* no mbuf's */
9152		return;
9153	}
9154	SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9155	sctp_alloc_a_chunk(stcb, chk);
9156	if (chk == NULL) {
9157		/* no memory */
9158		sctp_m_freem(m_shutdown);
9159		return;
9160	}
9161	chk->copy_by_ref = 0;
9162	chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9163	chk->rec.chunk_id.can_take_data = 1;
9164	chk->flags = 0;
9165	chk->send_size = sizeof(struct sctp_shutdown_chunk);
9166	chk->sent = SCTP_DATAGRAM_UNSENT;
9167	chk->snd_count = 0;
9168	chk->flags = 0;
9169	chk->asoc = &stcb->asoc;
9170	chk->data = m_shutdown;
9171	chk->whoTo = net;
9172	if (chk->whoTo) {
9173		atomic_add_int(&chk->whoTo->ref_count, 1);
9174	}
9175	shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9176	shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9177	shutdown_cp->ch.chunk_flags = 0;
9178	shutdown_cp->ch.chunk_length = htons(chk->send_size);
9179	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9180	SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9181	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9182	chk->asoc->ctrl_queue_cnt++;
9183	return;
9184}
9185
9186void
9187sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9188{
9189	/*
9190	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9191	 * should be queued on the assoc queue.
9192	 */
9193	struct sctp_tmit_chunk *chk;
9194	struct mbuf *m_asconf;
9195	int len;
9196
9197	SCTP_TCB_LOCK_ASSERT(stcb);
9198
9199	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9200	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9201		/* can't send a new one if there is one in flight already */
9202		return;
9203	}
9204	/* compose an ASCONF chunk, maximum length is PMTU */
9205	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9206	if (m_asconf == NULL) {
9207		return;
9208	}
9209	sctp_alloc_a_chunk(stcb, chk);
9210	if (chk == NULL) {
9211		/* no memory */
9212		sctp_m_freem(m_asconf);
9213		return;
9214	}
9215	chk->copy_by_ref = 0;
9216	chk->rec.chunk_id.id = SCTP_ASCONF;
9217	chk->rec.chunk_id.can_take_data = 0;
9218	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9219	chk->data = m_asconf;
9220	chk->send_size = len;
9221	chk->sent = SCTP_DATAGRAM_UNSENT;
9222	chk->snd_count = 0;
9223	chk->asoc = &stcb->asoc;
9224	chk->whoTo = net;
9225	if (chk->whoTo) {
9226		atomic_add_int(&chk->whoTo->ref_count, 1);
9227	}
9228	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9229	chk->asoc->ctrl_queue_cnt++;
9230	return;
9231}
9232
9233void
9234sctp_send_asconf_ack(struct sctp_tcb *stcb)
9235{
9236	/*
9237	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9238	 * must be stored in the tcb.
9239	 */
9240	struct sctp_tmit_chunk *chk;
9241	struct sctp_asconf_ack *ack, *latest_ack;
9242	struct mbuf *m_ack;
9243	struct sctp_nets *net = NULL;
9244
9245	SCTP_TCB_LOCK_ASSERT(stcb);
9246	/* Get the latest ASCONF-ACK */
9247	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9248	if (latest_ack == NULL) {
9249		return;
9250	}
9251	if (latest_ack->last_sent_to != NULL &&
9252	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9253		/* we're doing a retransmission */
9254		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9255		if (net == NULL) {
9256			/* no alternate */
9257			if (stcb->asoc.last_control_chunk_from == NULL) {
9258				if (stcb->asoc.alternate) {
9259					net = stcb->asoc.alternate;
9260				} else {
9261					net = stcb->asoc.primary_destination;
9262				}
9263			} else {
9264				net = stcb->asoc.last_control_chunk_from;
9265			}
9266		}
9267	} else {
9268		/* normal case */
9269		if (stcb->asoc.last_control_chunk_from == NULL) {
9270			if (stcb->asoc.alternate) {
9271				net = stcb->asoc.alternate;
9272			} else {
9273				net = stcb->asoc.primary_destination;
9274			}
9275		} else {
9276			net = stcb->asoc.last_control_chunk_from;
9277		}
9278	}
9279	latest_ack->last_sent_to = net;
9280
9281	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9282		if (ack->data == NULL) {
9283			continue;
9284		}
9285		/* copy the asconf_ack */
9286		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9287		if (m_ack == NULL) {
9288			/* couldn't copy it */
9289			return;
9290		}
9291#ifdef SCTP_MBUF_LOGGING
9292		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9293			sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9294		}
9295#endif
9296
9297		sctp_alloc_a_chunk(stcb, chk);
9298		if (chk == NULL) {
9299			/* no memory */
9300			if (m_ack)
9301				sctp_m_freem(m_ack);
9302			return;
9303		}
9304		chk->copy_by_ref = 0;
9305		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9306		chk->rec.chunk_id.can_take_data = 1;
9307		chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9308		chk->whoTo = net;
9309		if (chk->whoTo) {
9310			atomic_add_int(&chk->whoTo->ref_count, 1);
9311		}
9312		chk->data = m_ack;
9313		chk->send_size = ack->len;
9314		chk->sent = SCTP_DATAGRAM_UNSENT;
9315		chk->snd_count = 0;
9316		chk->asoc = &stcb->asoc;
9317
9318		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9319		chk->asoc->ctrl_queue_cnt++;
9320	}
9321	return;
9322}
9323
9324
9325static int
9326sctp_chunk_retransmission(struct sctp_inpcb *inp,
9327    struct sctp_tcb *stcb,
9328    struct sctp_association *asoc,
9329    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9330#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9331    SCTP_UNUSED
9332#endif
9333)
9334{
9335	/*-
9336	 * send out one MTU of retransmission. If fast_retransmit is
9337	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9338	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9339	 * retransmit them by themselves.
9340	 *
9341	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9342	 * marked for resend and bundle them all together (up to a MTU of
9343	 * destination). The address to send to should have been
9344	 * selected/changed where the retransmission was marked (i.e. in FR
9345	 * or t3-timeout routines).
9346	 */
9347	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9348	struct sctp_tmit_chunk *chk, *fwd;
9349	struct mbuf *m, *endofchain;
9350	struct sctp_nets *net = NULL;
9351	uint32_t tsns_sent = 0;
9352	int no_fragmentflg, bundle_at, cnt_thru;
9353	unsigned int mtu;
9354	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9355	struct sctp_auth_chunk *auth = NULL;
9356	uint32_t auth_offset = 0;
9357	uint16_t auth_keyid;
9358	int override_ok = 1;
9359	int data_auth_reqd = 0;
9360	uint32_t dmtu = 0;
9361
9362	SCTP_TCB_LOCK_ASSERT(stcb);
9363	tmr_started = ctl_cnt = bundle_at = error = 0;
9364	no_fragmentflg = 1;
9365	fwd_tsn = 0;
9366	*cnt_out = 0;
9367	fwd = NULL;
9368	endofchain = m = NULL;
9369	auth_keyid = stcb->asoc.authinfo.active_keyid;
9370#ifdef SCTP_AUDITING_ENABLED
9371	sctp_audit_log(0xC3, 1);
9372#endif
9373	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9374	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9375		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9376		    asoc->sent_queue_retran_cnt);
9377		asoc->sent_queue_cnt = 0;
9378		asoc->sent_queue_cnt_removeable = 0;
9379		/* send back 0/0 so we enter normal transmission */
9380		*cnt_out = 0;
9381		return (0);
9382	}
9383	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9384		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9385		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9386		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9387			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9388				continue;
9389			}
9390			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9391				if (chk != asoc->str_reset) {
9392					/*
9393					 * not eligible for retran if its
9394					 * not ours
9395					 */
9396					continue;
9397				}
9398			}
9399			ctl_cnt++;
9400			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9401				fwd_tsn = 1;
9402			}
9403			/*
9404			 * Add an AUTH chunk, if chunk requires it save the
9405			 * offset into the chain for AUTH
9406			 */
9407			if ((auth == NULL) &&
9408			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9409			    stcb->asoc.peer_auth_chunks))) {
9410				m = sctp_add_auth_chunk(m, &endofchain,
9411				    &auth, &auth_offset,
9412				    stcb,
9413				    chk->rec.chunk_id.id);
9414				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9415			}
9416			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9417			break;
9418		}
9419	}
9420	one_chunk = 0;
9421	cnt_thru = 0;
9422	/* do we have control chunks to retransmit? */
9423	if (m != NULL) {
9424		/* Start a timer no matter if we suceed or fail */
9425		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9426			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9427		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9428			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9429		chk->snd_count++;	/* update our count */
9430		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9431		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9432		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9433		    no_fragmentflg, 0, 0,
9434		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9435		    chk->whoTo->port, NULL,
9436		    0, 0,
9437		    so_locked))) {
9438			SCTP_STAT_INCR(sctps_lowlevelerr);
9439			return (error);
9440		}
9441		endofchain = NULL;
9442		auth = NULL;
9443		auth_offset = 0;
9444		/*
9445		 * We don't want to mark the net->sent time here since this
9446		 * we use this for HB and retrans cannot measure RTT
9447		 */
9448		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9449		*cnt_out += 1;
9450		chk->sent = SCTP_DATAGRAM_SENT;
9451		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9452		if (fwd_tsn == 0) {
9453			return (0);
9454		} else {
9455			/* Clean up the fwd-tsn list */
9456			sctp_clean_up_ctl(stcb, asoc, so_locked);
9457			return (0);
9458		}
9459	}
9460	/*
9461	 * Ok, it is just data retransmission we need to do or that and a
9462	 * fwd-tsn with it all.
9463	 */
9464	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9465		return (SCTP_RETRAN_DONE);
9466	}
9467	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9468	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9469		/* not yet open, resend the cookie and that is it */
9470		return (1);
9471	}
9472#ifdef SCTP_AUDITING_ENABLED
9473	sctp_auditing(20, inp, stcb, NULL);
9474#endif
9475	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9476	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9477		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9478			/* No, not sent to this net or not ready for rtx */
9479			continue;
9480		}
9481		if (chk->data == NULL) {
9482			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9483			    chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9484			continue;
9485		}
9486		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9487		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9488			/* Gak, we have exceeded max unlucky retran, abort! */
9489			SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9490			    chk->snd_count,
9491			    SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9492			atomic_add_int(&stcb->asoc.refcnt, 1);
9493			sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9494			SCTP_TCB_LOCK(stcb);
9495			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9496			return (SCTP_RETRAN_EXIT);
9497		}
9498		/* pick up the net */
9499		net = chk->whoTo;
9500		switch (net->ro._l_addr.sa.sa_family) {
9501#ifdef INET
9502		case AF_INET:
9503			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9504			break;
9505#endif
9506#ifdef INET6
9507		case AF_INET6:
9508			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9509			break;
9510#endif
9511		default:
9512			/* TSNH */
9513			mtu = net->mtu;
9514			break;
9515		}
9516
9517		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9518			/* No room in peers rwnd */
9519			uint32_t tsn;
9520
9521			tsn = asoc->last_acked_seq + 1;
9522			if (tsn == chk->rec.data.TSN_seq) {
9523				/*
9524				 * we make a special exception for this
9525				 * case. The peer has no rwnd but is missing
9526				 * the lowest chunk.. which is probably what
9527				 * is holding up the rwnd.
9528				 */
9529				goto one_chunk_around;
9530			}
9531			return (1);
9532		}
9533one_chunk_around:
9534		if (asoc->peers_rwnd < mtu) {
9535			one_chunk = 1;
9536			if ((asoc->peers_rwnd == 0) &&
9537			    (asoc->total_flight == 0)) {
9538				chk->window_probe = 1;
9539				chk->whoTo->window_probe = 1;
9540			}
9541		}
9542#ifdef SCTP_AUDITING_ENABLED
9543		sctp_audit_log(0xC3, 2);
9544#endif
9545		bundle_at = 0;
9546		m = NULL;
9547		net->fast_retran_ip = 0;
9548		if (chk->rec.data.doing_fast_retransmit == 0) {
9549			/*
9550			 * if no FR in progress skip destination that have
9551			 * flight_size > cwnd.
9552			 */
9553			if (net->flight_size >= net->cwnd) {
9554				continue;
9555			}
9556		} else {
9557			/*
9558			 * Mark the destination net to have FR recovery
9559			 * limits put on it.
9560			 */
9561			*fr_done = 1;
9562			net->fast_retran_ip = 1;
9563		}
9564
9565		/*
9566		 * if no AUTH is yet included and this chunk requires it,
9567		 * make sure to account for it.  We don't apply the size
9568		 * until the AUTH chunk is actually added below in case
9569		 * there is no room for this chunk.
9570		 */
9571		if (data_auth_reqd && (auth == NULL)) {
9572			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9573		} else
9574			dmtu = 0;
9575
9576		if ((chk->send_size <= (mtu - dmtu)) ||
9577		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9578			/* ok we will add this one */
9579			if (data_auth_reqd) {
9580				if (auth == NULL) {
9581					m = sctp_add_auth_chunk(m,
9582					    &endofchain,
9583					    &auth,
9584					    &auth_offset,
9585					    stcb,
9586					    SCTP_DATA);
9587					auth_keyid = chk->auth_keyid;
9588					override_ok = 0;
9589					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9590				} else if (override_ok) {
9591					auth_keyid = chk->auth_keyid;
9592					override_ok = 0;
9593				} else if (chk->auth_keyid != auth_keyid) {
9594					/* different keyid, so done bundling */
9595					break;
9596				}
9597			}
9598			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9599			if (m == NULL) {
9600				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9601				return (ENOMEM);
9602			}
9603			/* Do clear IP_DF ? */
9604			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9605				no_fragmentflg = 0;
9606			}
9607			/* upate our MTU size */
9608			if (mtu > (chk->send_size + dmtu))
9609				mtu -= (chk->send_size + dmtu);
9610			else
9611				mtu = 0;
9612			data_list[bundle_at++] = chk;
9613			if (one_chunk && (asoc->total_flight <= 0)) {
9614				SCTP_STAT_INCR(sctps_windowprobed);
9615			}
9616		}
9617		if (one_chunk == 0) {
9618			/*
9619			 * now are there anymore forward from chk to pick
9620			 * up?
9621			 */
9622			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9623				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9624					/* Nope, not for retran */
9625					continue;
9626				}
9627				if (fwd->whoTo != net) {
9628					/* Nope, not the net in question */
9629					continue;
9630				}
9631				if (data_auth_reqd && (auth == NULL)) {
9632					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9633				} else
9634					dmtu = 0;
9635				if (fwd->send_size <= (mtu - dmtu)) {
9636					if (data_auth_reqd) {
9637						if (auth == NULL) {
9638							m = sctp_add_auth_chunk(m,
9639							    &endofchain,
9640							    &auth,
9641							    &auth_offset,
9642							    stcb,
9643							    SCTP_DATA);
9644							auth_keyid = fwd->auth_keyid;
9645							override_ok = 0;
9646							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9647						} else if (override_ok) {
9648							auth_keyid = fwd->auth_keyid;
9649							override_ok = 0;
9650						} else if (fwd->auth_keyid != auth_keyid) {
9651							/*
9652							 * different keyid,
9653							 * so done bundling
9654							 */
9655							break;
9656						}
9657					}
9658					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9659					if (m == NULL) {
9660						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9661						return (ENOMEM);
9662					}
9663					/* Do clear IP_DF ? */
9664					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9665						no_fragmentflg = 0;
9666					}
9667					/* upate our MTU size */
9668					if (mtu > (fwd->send_size + dmtu))
9669						mtu -= (fwd->send_size + dmtu);
9670					else
9671						mtu = 0;
9672					data_list[bundle_at++] = fwd;
9673					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9674						break;
9675					}
9676				} else {
9677					/* can't fit so we are done */
9678					break;
9679				}
9680			}
9681		}
9682		/* Is there something to send for this destination? */
9683		if (m) {
9684			/*
9685			 * No matter if we fail/or suceed we should start a
9686			 * timer. A failure is like a lost IP packet :-)
9687			 */
9688			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9689				/*
9690				 * no timer running on this destination
9691				 * restart it.
9692				 */
9693				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9694				tmr_started = 1;
9695			}
9696			/* Now lets send it, if there is anything to send :> */
9697			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9698			    (struct sockaddr *)&net->ro._l_addr, m,
9699			    auth_offset, auth, auth_keyid,
9700			    no_fragmentflg, 0, 0,
9701			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9702			    net->port, NULL,
9703			    0, 0,
9704			    so_locked))) {
9705				/* error, we could not output */
9706				SCTP_STAT_INCR(sctps_lowlevelerr);
9707				return (error);
9708			}
9709			endofchain = NULL;
9710			auth = NULL;
9711			auth_offset = 0;
9712			/* For HB's */
9713			/*
9714			 * We don't want to mark the net->sent time here
9715			 * since this we use this for HB and retrans cannot
9716			 * measure RTT
9717			 */
9718			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9719
9720			/* For auto-close */
9721			cnt_thru++;
9722			if (*now_filled == 0) {
9723				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9724				*now = asoc->time_last_sent;
9725				*now_filled = 1;
9726			} else {
9727				asoc->time_last_sent = *now;
9728			}
9729			*cnt_out += bundle_at;
9730#ifdef SCTP_AUDITING_ENABLED
9731			sctp_audit_log(0xC4, bundle_at);
9732#endif
9733			if (bundle_at) {
9734				tsns_sent = data_list[0]->rec.data.TSN_seq;
9735			}
9736			for (i = 0; i < bundle_at; i++) {
9737				SCTP_STAT_INCR(sctps_sendretransdata);
9738				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9739				/*
9740				 * When we have a revoked data, and we
9741				 * retransmit it, then we clear the revoked
9742				 * flag since this flag dictates if we
9743				 * subtracted from the fs
9744				 */
9745				if (data_list[i]->rec.data.chunk_was_revoked) {
9746					/* Deflate the cwnd */
9747					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9748					data_list[i]->rec.data.chunk_was_revoked = 0;
9749				}
9750				data_list[i]->snd_count++;
9751				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9752				/* record the time */
9753				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9754				if (data_list[i]->book_size_scale) {
9755					/*
9756					 * need to double the book size on
9757					 * this one
9758					 */
9759					data_list[i]->book_size_scale = 0;
9760					/*
9761					 * Since we double the booksize, we
9762					 * must also double the output queue
9763					 * size, since this get shrunk when
9764					 * we free by this amount.
9765					 */
9766					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9767					data_list[i]->book_size *= 2;
9768
9769
9770				} else {
9771					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9772						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9773						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9774					}
9775					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9776					    (uint32_t) (data_list[i]->send_size +
9777					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9778				}
9779				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9780					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9781					    data_list[i]->whoTo->flight_size,
9782					    data_list[i]->book_size,
9783					    (uintptr_t) data_list[i]->whoTo,
9784					    data_list[i]->rec.data.TSN_seq);
9785				}
9786				sctp_flight_size_increase(data_list[i]);
9787				sctp_total_flight_increase(stcb, data_list[i]);
9788				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9789					/* SWS sender side engages */
9790					asoc->peers_rwnd = 0;
9791				}
9792				if ((i == 0) &&
9793				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9794					SCTP_STAT_INCR(sctps_sendfastretrans);
9795					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9796					    (tmr_started == 0)) {
9797						/*-
9798						 * ok we just fast-retrans'd
9799						 * the lowest TSN, i.e the
9800						 * first on the list. In
9801						 * this case we want to give
9802						 * some more time to get a
9803						 * SACK back without a
9804						 * t3-expiring.
9805						 */
9806						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9807						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9808						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9809					}
9810				}
9811			}
9812			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9813				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9814			}
9815#ifdef SCTP_AUDITING_ENABLED
9816			sctp_auditing(21, inp, stcb, NULL);
9817#endif
9818		} else {
9819			/* None will fit */
9820			return (1);
9821		}
9822		if (asoc->sent_queue_retran_cnt <= 0) {
9823			/* all done we have no more to retran */
9824			asoc->sent_queue_retran_cnt = 0;
9825			break;
9826		}
9827		if (one_chunk) {
9828			/* No more room in rwnd */
9829			return (1);
9830		}
9831		/* stop the for loop here. we sent out a packet */
9832		break;
9833	}
9834	return (0);
9835}
9836
9837static void
9838sctp_timer_validation(struct sctp_inpcb *inp,
9839    struct sctp_tcb *stcb,
9840    struct sctp_association *asoc)
9841{
9842	struct sctp_nets *net;
9843
9844	/* Validate that a timer is running somewhere */
9845	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9846		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9847			/* Here is a timer */
9848			return;
9849		}
9850	}
9851	SCTP_TCB_LOCK_ASSERT(stcb);
9852	/* Gak, we did not have a timer somewhere */
9853	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9854	if (asoc->alternate) {
9855		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9856	} else {
9857		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9858	}
9859	return;
9860}
9861
9862void
9863sctp_chunk_output(struct sctp_inpcb *inp,
9864    struct sctp_tcb *stcb,
9865    int from_where,
9866    int so_locked
9867#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9868    SCTP_UNUSED
9869#endif
9870)
9871{
9872	/*-
9873	 * Ok this is the generic chunk service queue. we must do the
9874	 * following:
9875	 * - See if there are retransmits pending, if so we must
9876	 *   do these first.
9877	 * - Service the stream queue that is next, moving any
9878	 *   message (note I must get a complete message i.e.
9879	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9880	 *   TSN's
9881	 * - Check to see if the cwnd/rwnd allows any output, if so we
9882	 *   go ahead and fomulate and send the low level chunks. Making sure
9883	 *   to combine any control in the control chunk queue also.
9884	 */
9885	struct sctp_association *asoc;
9886	struct sctp_nets *net;
9887	int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9888	unsigned int burst_cnt = 0;
9889	struct timeval now;
9890	int now_filled = 0;
9891	int nagle_on;
9892	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9893	int un_sent = 0;
9894	int fr_done;
9895	unsigned int tot_frs = 0;
9896
9897	asoc = &stcb->asoc;
9898	/* The Nagle algorithm is only applied when handling a send call. */
9899	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9900		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9901			nagle_on = 0;
9902		} else {
9903			nagle_on = 1;
9904		}
9905	} else {
9906		nagle_on = 0;
9907	}
9908	SCTP_TCB_LOCK_ASSERT(stcb);
9909
9910	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9911
9912	if ((un_sent <= 0) &&
9913	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9914	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9915	    (asoc->sent_queue_retran_cnt == 0)) {
9916		/* Nothing to do unless there is something to be sent left */
9917		return;
9918	}
9919	/*
9920	 * Do we have something to send, data or control AND a sack timer
9921	 * running, if so piggy-back the sack.
9922	 */
9923	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9924		sctp_send_sack(stcb, so_locked);
9925		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9926	}
9927	while (asoc->sent_queue_retran_cnt) {
9928		/*-
9929		 * Ok, it is retransmission time only, we send out only ONE
9930		 * packet with a single call off to the retran code.
9931		 */
9932		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9933			/*-
9934			 * Special hook for handling cookiess discarded
9935			 * by peer that carried data. Send cookie-ack only
9936			 * and then the next call with get the retran's.
9937			 */
9938			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9939			    from_where,
9940			    &now, &now_filled, frag_point, so_locked);
9941			return;
9942		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9943			/* if its not from a HB then do it */
9944			fr_done = 0;
9945			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9946			if (fr_done) {
9947				tot_frs++;
9948			}
9949		} else {
9950			/*
9951			 * its from any other place, we don't allow retran
9952			 * output (only control)
9953			 */
9954			ret = 1;
9955		}
9956		if (ret > 0) {
9957			/* Can't send anymore */
9958			/*-
9959			 * now lets push out control by calling med-level
9960			 * output once. this assures that we WILL send HB's
9961			 * if queued too.
9962			 */
9963			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9964			    from_where,
9965			    &now, &now_filled, frag_point, so_locked);
9966#ifdef SCTP_AUDITING_ENABLED
9967			sctp_auditing(8, inp, stcb, NULL);
9968#endif
9969			sctp_timer_validation(inp, stcb, asoc);
9970			return;
9971		}
9972		if (ret < 0) {
9973			/*-
9974			 * The count was off.. retran is not happening so do
9975			 * the normal retransmission.
9976			 */
9977#ifdef SCTP_AUDITING_ENABLED
9978			sctp_auditing(9, inp, stcb, NULL);
9979#endif
9980			if (ret == SCTP_RETRAN_EXIT) {
9981				return;
9982			}
9983			break;
9984		}
9985		if (from_where == SCTP_OUTPUT_FROM_T3) {
9986			/* Only one transmission allowed out of a timeout */
9987#ifdef SCTP_AUDITING_ENABLED
9988			sctp_auditing(10, inp, stcb, NULL);
9989#endif
9990			/* Push out any control */
9991			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9992			    &now, &now_filled, frag_point, so_locked);
9993			return;
9994		}
9995		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9996			/* Hit FR burst limit */
9997			return;
9998		}
9999		if ((num_out == 0) && (ret == 0)) {
10000			/* No more retrans to send */
10001			break;
10002		}
10003	}
10004#ifdef SCTP_AUDITING_ENABLED
10005	sctp_auditing(12, inp, stcb, NULL);
10006#endif
10007	/* Check for bad destinations, if they exist move chunks around. */
10008	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10009		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10010			/*-
10011			 * if possible move things off of this address we
10012			 * still may send below due to the dormant state but
10013			 * we try to find an alternate address to send to
10014			 * and if we have one we move all queued data on the
10015			 * out wheel to this alternate address.
10016			 */
10017			if (net->ref_count > 1)
10018				sctp_move_chunks_from_net(stcb, net);
10019		} else {
10020			/*-
10021			 * if ((asoc->sat_network) || (net->addr_is_local))
10022			 * { burst_limit = asoc->max_burst *
10023			 * SCTP_SAT_NETWORK_BURST_INCR; }
10024			 */
10025			if (asoc->max_burst > 0) {
10026				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10027					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10028						/*
10029						 * JRS - Use the congestion
10030						 * control given in the
10031						 * congestion control module
10032						 */
10033						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10034						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10035							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10036						}
10037						SCTP_STAT_INCR(sctps_maxburstqueued);
10038					}
10039					net->fast_retran_ip = 0;
10040				} else {
10041					if (net->flight_size == 0) {
10042						/*
10043						 * Should be decaying the
10044						 * cwnd here
10045						 */
10046						;
10047					}
10048				}
10049			}
10050		}
10051
10052	}
10053	burst_cnt = 0;
10054	do {
10055		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10056		    &reason_code, 0, from_where,
10057		    &now, &now_filled, frag_point, so_locked);
10058		if (error) {
10059			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10060			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10061				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10062			}
10063			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10064				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10065				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10066			}
10067			break;
10068		}
10069		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10070
10071		tot_out += num_out;
10072		burst_cnt++;
10073		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10074			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10075			if (num_out == 0) {
10076				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10077			}
10078		}
10079		if (nagle_on) {
10080			/*
10081			 * When the Nagle algorithm is used, look at how
10082			 * much is unsent, then if its smaller than an MTU
10083			 * and we have data in flight we stop, except if we
10084			 * are handling a fragmented user message.
10085			 */
10086			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10087			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10088			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10089			    (stcb->asoc.total_flight > 0) &&
10090			    ((stcb->asoc.locked_on_sending == NULL) ||
10091			    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10092				break;
10093			}
10094		}
10095		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10096		    TAILQ_EMPTY(&asoc->send_queue) &&
10097		    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10098			/* Nothing left to send */
10099			break;
10100		}
10101		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10102			/* Nothing left to send */
10103			break;
10104		}
10105	} while (num_out &&
10106	    ((asoc->max_burst == 0) ||
10107	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10108	    (burst_cnt < asoc->max_burst)));
10109
10110	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10111		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10112			SCTP_STAT_INCR(sctps_maxburstqueued);
10113			asoc->burst_limit_applied = 1;
10114			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10115				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10116			}
10117		} else {
10118			asoc->burst_limit_applied = 0;
10119		}
10120	}
10121	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10122		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10123	}
10124	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10125	    tot_out);
10126
10127	/*-
10128	 * Now we need to clean up the control chunk chain if a ECNE is on
10129	 * it. It must be marked as UNSENT again so next call will continue
10130	 * to send it until such time that we get a CWR, to remove it.
10131	 */
10132	if (stcb->asoc.ecn_echo_cnt_onq)
10133		sctp_fix_ecn_echo(asoc);
10134	return;
10135}
10136
10137
10138int
10139sctp_output(
10140    struct sctp_inpcb *inp,
10141    struct mbuf *m,
10142    struct sockaddr *addr,
10143    struct mbuf *control,
10144    struct thread *p,
10145    int flags)
10146{
10147	if (inp == NULL) {
10148		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10149		return (EINVAL);
10150	}
10151	if (inp->sctp_socket == NULL) {
10152		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10153		return (EINVAL);
10154	}
10155	return (sctp_sosend(inp->sctp_socket,
10156	    addr,
10157	    (struct uio *)NULL,
10158	    m,
10159	    control,
10160	    flags, p
10161	    ));
10162}
10163
10164void
10165send_forward_tsn(struct sctp_tcb *stcb,
10166    struct sctp_association *asoc)
10167{
10168	struct sctp_tmit_chunk *chk;
10169	struct sctp_forward_tsn_chunk *fwdtsn;
10170	uint32_t advance_peer_ack_point;
10171
10172	SCTP_TCB_LOCK_ASSERT(stcb);
10173	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10174		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10175			/* mark it to unsent */
10176			chk->sent = SCTP_DATAGRAM_UNSENT;
10177			chk->snd_count = 0;
10178			/* Do we correct its output location? */
10179			if (chk->whoTo) {
10180				sctp_free_remote_addr(chk->whoTo);
10181				chk->whoTo = NULL;
10182			}
10183			goto sctp_fill_in_rest;
10184		}
10185	}
10186	/* Ok if we reach here we must build one */
10187	sctp_alloc_a_chunk(stcb, chk);
10188	if (chk == NULL) {
10189		return;
10190	}
10191	asoc->fwd_tsn_cnt++;
10192	chk->copy_by_ref = 0;
10193	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10194	chk->rec.chunk_id.can_take_data = 0;
10195	chk->flags = 0;
10196	chk->asoc = asoc;
10197	chk->whoTo = NULL;
10198	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10199	if (chk->data == NULL) {
10200		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10201		return;
10202	}
10203	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10204	chk->sent = SCTP_DATAGRAM_UNSENT;
10205	chk->snd_count = 0;
10206	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10207	asoc->ctrl_queue_cnt++;
10208sctp_fill_in_rest:
10209	/*-
10210	 * Here we go through and fill out the part that deals with
10211	 * stream/seq of the ones we skip.
10212	 */
10213	SCTP_BUF_LEN(chk->data) = 0;
10214	{
10215		struct sctp_tmit_chunk *at, *tp1, *last;
10216		struct sctp_strseq *strseq;
10217		unsigned int cnt_of_space, i, ovh;
10218		unsigned int space_needed;
10219		unsigned int cnt_of_skipped = 0;
10220
10221		TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10222			if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10223			    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10224				/* no more to look at */
10225				break;
10226			}
10227			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10228				/* We don't report these */
10229				continue;
10230			}
10231			cnt_of_skipped++;
10232		}
10233		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10234		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10235
10236		cnt_of_space = M_TRAILINGSPACE(chk->data);
10237
10238		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10239			ovh = SCTP_MIN_OVERHEAD;
10240		} else {
10241			ovh = SCTP_MIN_V4_OVERHEAD;
10242		}
10243		if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10244			/* trim to a mtu size */
10245			cnt_of_space = asoc->smallest_mtu - ovh;
10246		}
10247		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10248			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10249			    0xff, 0, cnt_of_skipped,
10250			    asoc->advanced_peer_ack_point);
10251
10252		}
10253		advance_peer_ack_point = asoc->advanced_peer_ack_point;
10254		if (cnt_of_space < space_needed) {
10255			/*-
10256			 * ok we must trim down the chunk by lowering the
10257			 * advance peer ack point.
10258			 */
10259			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10260				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10261				    0xff, 0xff, cnt_of_space,
10262				    space_needed);
10263			}
10264			cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10265			cnt_of_skipped /= sizeof(struct sctp_strseq);
10266			/*-
10267			 * Go through and find the TSN that will be the one
10268			 * we report.
10269			 */
10270			at = TAILQ_FIRST(&asoc->sent_queue);
10271			if (at != NULL) {
10272				for (i = 0; i < cnt_of_skipped; i++) {
10273					tp1 = TAILQ_NEXT(at, sctp_next);
10274					if (tp1 == NULL) {
10275						break;
10276					}
10277					at = tp1;
10278				}
10279			}
10280			if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10281				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10282				    0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10283				    asoc->advanced_peer_ack_point);
10284			}
10285			last = at;
10286			/*-
10287			 * last now points to last one I can report, update
10288			 * peer ack point
10289			 */
10290			if (last)
10291				advance_peer_ack_point = last->rec.data.TSN_seq;
10292			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10293			    cnt_of_skipped * sizeof(struct sctp_strseq);
10294		}
10295		chk->send_size = space_needed;
10296		/* Setup the chunk */
10297		fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10298		fwdtsn->ch.chunk_length = htons(chk->send_size);
10299		fwdtsn->ch.chunk_flags = 0;
10300		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10301		fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10302		SCTP_BUF_LEN(chk->data) = chk->send_size;
10303		fwdtsn++;
10304		/*-
10305		 * Move pointer to after the fwdtsn and transfer to the
10306		 * strseq pointer.
10307		 */
10308		strseq = (struct sctp_strseq *)fwdtsn;
10309		/*-
10310		 * Now populate the strseq list. This is done blindly
10311		 * without pulling out duplicate stream info. This is
10312		 * inefficent but won't harm the process since the peer will
10313		 * look at these in sequence and will thus release anything.
10314		 * It could mean we exceed the PMTU and chop off some that
10315		 * we could have included.. but this is unlikely (aka 1432/4
10316		 * would mean 300+ stream seq's would have to be reported in
10317		 * one FWD-TSN. With a bit of work we can later FIX this to
10318		 * optimize and pull out duplcates.. but it does add more
10319		 * overhead. So for now... not!
10320		 */
10321		at = TAILQ_FIRST(&asoc->sent_queue);
10322		for (i = 0; i < cnt_of_skipped; i++) {
10323			tp1 = TAILQ_NEXT(at, sctp_next);
10324			if (tp1 == NULL)
10325				break;
10326			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10327				/* We don't report these */
10328				i--;
10329				at = tp1;
10330				continue;
10331			}
10332			if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10333				at->rec.data.fwd_tsn_cnt = 0;
10334			}
10335			strseq->stream = ntohs(at->rec.data.stream_number);
10336			strseq->sequence = ntohs(at->rec.data.stream_seq);
10337			strseq++;
10338			at = tp1;
10339		}
10340	}
10341	return;
10342}
10343
10344void
10345sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10346#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10347    SCTP_UNUSED
10348#endif
10349)
10350{
10351	/*-
10352	 * Queue up a SACK or NR-SACK in the control queue.
10353	 * We must first check to see if a SACK or NR-SACK is
10354	 * somehow on the control queue.
10355	 * If so, we will take and and remove the old one.
10356	 */
10357	struct sctp_association *asoc;
10358	struct sctp_tmit_chunk *chk, *a_chk;
10359	struct sctp_sack_chunk *sack;
10360	struct sctp_nr_sack_chunk *nr_sack;
10361	struct sctp_gap_ack_block *gap_descriptor;
10362	struct sack_track *selector;
10363	int mergeable = 0;
10364	int offset;
10365	caddr_t limit;
10366	uint32_t *dup;
10367	int limit_reached = 0;
10368	unsigned int i, siz, j;
10369	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10370	int num_dups = 0;
10371	int space_req;
10372	uint32_t highest_tsn;
10373	uint8_t flags;
10374	uint8_t type;
10375	uint8_t tsn_map;
10376
10377	if (stcb->asoc.nrsack_supported == 1) {
10378		type = SCTP_NR_SELECTIVE_ACK;
10379	} else {
10380		type = SCTP_SELECTIVE_ACK;
10381	}
10382	a_chk = NULL;
10383	asoc = &stcb->asoc;
10384	SCTP_TCB_LOCK_ASSERT(stcb);
10385	if (asoc->last_data_chunk_from == NULL) {
10386		/* Hmm we never received anything */
10387		return;
10388	}
10389	sctp_slide_mapping_arrays(stcb);
10390	sctp_set_rwnd(stcb, asoc);
10391	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10392		if (chk->rec.chunk_id.id == type) {
10393			/* Hmm, found a sack already on queue, remove it */
10394			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10395			asoc->ctrl_queue_cnt--;
10396			a_chk = chk;
10397			if (a_chk->data) {
10398				sctp_m_freem(a_chk->data);
10399				a_chk->data = NULL;
10400			}
10401			if (a_chk->whoTo) {
10402				sctp_free_remote_addr(a_chk->whoTo);
10403				a_chk->whoTo = NULL;
10404			}
10405			break;
10406		}
10407	}
10408	if (a_chk == NULL) {
10409		sctp_alloc_a_chunk(stcb, a_chk);
10410		if (a_chk == NULL) {
10411			/* No memory so we drop the idea, and set a timer */
10412			if (stcb->asoc.delayed_ack) {
10413				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10414				    stcb->sctp_ep, stcb, NULL,
10415				    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10416				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10417				    stcb->sctp_ep, stcb, NULL);
10418			} else {
10419				stcb->asoc.send_sack = 1;
10420			}
10421			return;
10422		}
10423		a_chk->copy_by_ref = 0;
10424		a_chk->rec.chunk_id.id = type;
10425		a_chk->rec.chunk_id.can_take_data = 1;
10426	}
10427	/* Clear our pkt counts */
10428	asoc->data_pkts_seen = 0;
10429
10430	a_chk->flags = 0;
10431	a_chk->asoc = asoc;
10432	a_chk->snd_count = 0;
10433	a_chk->send_size = 0;	/* fill in later */
10434	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10435	a_chk->whoTo = NULL;
10436
10437	if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10438		/*-
10439		 * Ok, the destination for the SACK is unreachable, lets see if
10440		 * we can select an alternate to asoc->last_data_chunk_from
10441		 */
10442		a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10443		if (a_chk->whoTo == NULL) {
10444			/* Nope, no alternate */
10445			a_chk->whoTo = asoc->last_data_chunk_from;
10446		}
10447	} else {
10448		a_chk->whoTo = asoc->last_data_chunk_from;
10449	}
10450	if (a_chk->whoTo) {
10451		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10452	}
10453	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10454		highest_tsn = asoc->highest_tsn_inside_map;
10455	} else {
10456		highest_tsn = asoc->highest_tsn_inside_nr_map;
10457	}
10458	if (highest_tsn == asoc->cumulative_tsn) {
10459		/* no gaps */
10460		if (type == SCTP_SELECTIVE_ACK) {
10461			space_req = sizeof(struct sctp_sack_chunk);
10462		} else {
10463			space_req = sizeof(struct sctp_nr_sack_chunk);
10464		}
10465	} else {
10466		/* gaps get a cluster */
10467		space_req = MCLBYTES;
10468	}
10469	/* Ok now lets formulate a MBUF with our sack */
10470	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10471	if ((a_chk->data == NULL) ||
10472	    (a_chk->whoTo == NULL)) {
10473		/* rats, no mbuf memory */
10474		if (a_chk->data) {
10475			/* was a problem with the destination */
10476			sctp_m_freem(a_chk->data);
10477			a_chk->data = NULL;
10478		}
10479		sctp_free_a_chunk(stcb, a_chk, so_locked);
10480		/* sa_ignore NO_NULL_CHK */
10481		if (stcb->asoc.delayed_ack) {
10482			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10483			    stcb->sctp_ep, stcb, NULL,
10484			    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10485			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10486			    stcb->sctp_ep, stcb, NULL);
10487		} else {
10488			stcb->asoc.send_sack = 1;
10489		}
10490		return;
10491	}
10492	/* ok, lets go through and fill it in */
10493	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10494	space = M_TRAILINGSPACE(a_chk->data);
10495	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10496		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10497	}
10498	limit = mtod(a_chk->data, caddr_t);
10499	limit += space;
10500
10501	flags = 0;
10502
10503	if ((asoc->sctp_cmt_on_off > 0) &&
10504	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10505		/*-
10506		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10507		 * received, then set high bit to 1, else 0. Reset
10508		 * pkts_rcvd.
10509		 */
10510		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10511		asoc->cmt_dac_pkts_rcvd = 0;
10512	}
10513#ifdef SCTP_ASOCLOG_OF_TSNS
10514	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10515	stcb->asoc.cumack_log_atsnt++;
10516	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10517		stcb->asoc.cumack_log_atsnt = 0;
10518	}
10519#endif
10520	/* reset the readers interpretation */
10521	stcb->freed_by_sorcv_sincelast = 0;
10522
10523	if (type == SCTP_SELECTIVE_ACK) {
10524		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10525		nr_sack = NULL;
10526		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10527		if (highest_tsn > asoc->mapping_array_base_tsn) {
10528			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10529		} else {
10530			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10531		}
10532	} else {
10533		sack = NULL;
10534		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10535		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10536		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10537			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10538		} else {
10539			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10540		}
10541	}
10542
10543	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10544		offset = 1;
10545	} else {
10546		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10547	}
10548	if (((type == SCTP_SELECTIVE_ACK) &&
10549	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10550	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10551	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10552		/* we have a gap .. maybe */
10553		for (i = 0; i < siz; i++) {
10554			tsn_map = asoc->mapping_array[i];
10555			if (type == SCTP_SELECTIVE_ACK) {
10556				tsn_map |= asoc->nr_mapping_array[i];
10557			}
10558			if (i == 0) {
10559				/*
10560				 * Clear all bits corresponding to TSNs
10561				 * smaller or equal to the cumulative TSN.
10562				 */
10563				tsn_map &= (~0 << (1 - offset));
10564			}
10565			selector = &sack_array[tsn_map];
10566			if (mergeable && selector->right_edge) {
10567				/*
10568				 * Backup, left and right edges were ok to
10569				 * merge.
10570				 */
10571				num_gap_blocks--;
10572				gap_descriptor--;
10573			}
10574			if (selector->num_entries == 0)
10575				mergeable = 0;
10576			else {
10577				for (j = 0; j < selector->num_entries; j++) {
10578					if (mergeable && selector->right_edge) {
10579						/*
10580						 * do a merge by NOT setting
10581						 * the left side
10582						 */
10583						mergeable = 0;
10584					} else {
10585						/*
10586						 * no merge, set the left
10587						 * side
10588						 */
10589						mergeable = 0;
10590						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10591					}
10592					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10593					num_gap_blocks++;
10594					gap_descriptor++;
10595					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10596						/* no more room */
10597						limit_reached = 1;
10598						break;
10599					}
10600				}
10601				if (selector->left_edge) {
10602					mergeable = 1;
10603				}
10604			}
10605			if (limit_reached) {
10606				/* Reached the limit stop */
10607				break;
10608			}
10609			offset += 8;
10610		}
10611	}
10612	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10613	    (limit_reached == 0)) {
10614
10615		mergeable = 0;
10616
10617		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10618			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10619		} else {
10620			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10621		}
10622
10623		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10624			offset = 1;
10625		} else {
10626			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10627		}
10628		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10629			/* we have a gap .. maybe */
10630			for (i = 0; i < siz; i++) {
10631				tsn_map = asoc->nr_mapping_array[i];
10632				if (i == 0) {
10633					/*
10634					 * Clear all bits corresponding to
10635					 * TSNs smaller or equal to the
10636					 * cumulative TSN.
10637					 */
10638					tsn_map &= (~0 << (1 - offset));
10639				}
10640				selector = &sack_array[tsn_map];
10641				if (mergeable && selector->right_edge) {
10642					/*
10643					 * Backup, left and right edges were
10644					 * ok to merge.
10645					 */
10646					num_nr_gap_blocks--;
10647					gap_descriptor--;
10648				}
10649				if (selector->num_entries == 0)
10650					mergeable = 0;
10651				else {
10652					for (j = 0; j < selector->num_entries; j++) {
10653						if (mergeable && selector->right_edge) {
10654							/*
10655							 * do a merge by NOT
10656							 * setting the left
10657							 * side
10658							 */
10659							mergeable = 0;
10660						} else {
10661							/*
10662							 * no merge, set the
10663							 * left side
10664							 */
10665							mergeable = 0;
10666							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10667						}
10668						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10669						num_nr_gap_blocks++;
10670						gap_descriptor++;
10671						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10672							/* no more room */
10673							limit_reached = 1;
10674							break;
10675						}
10676					}
10677					if (selector->left_edge) {
10678						mergeable = 1;
10679					}
10680				}
10681				if (limit_reached) {
10682					/* Reached the limit stop */
10683					break;
10684				}
10685				offset += 8;
10686			}
10687		}
10688	}
10689	/* now we must add any dups we are going to report. */
10690	if ((limit_reached == 0) && (asoc->numduptsns)) {
10691		dup = (uint32_t *) gap_descriptor;
10692		for (i = 0; i < asoc->numduptsns; i++) {
10693			*dup = htonl(asoc->dup_tsns[i]);
10694			dup++;
10695			num_dups++;
10696			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10697				/* no more room */
10698				break;
10699			}
10700		}
10701		asoc->numduptsns = 0;
10702	}
10703	/*
10704	 * now that the chunk is prepared queue it to the control chunk
10705	 * queue.
10706	 */
10707	if (type == SCTP_SELECTIVE_ACK) {
10708		a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10709		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10710		    num_dups * sizeof(int32_t);
10711		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10712		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10713		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10714		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10715		sack->sack.num_dup_tsns = htons(num_dups);
10716		sack->ch.chunk_type = type;
10717		sack->ch.chunk_flags = flags;
10718		sack->ch.chunk_length = htons(a_chk->send_size);
10719	} else {
10720		a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10721		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10722		    num_dups * sizeof(int32_t);
10723		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10724		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10725		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10726		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10727		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10728		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10729		nr_sack->nr_sack.reserved = 0;
10730		nr_sack->ch.chunk_type = type;
10731		nr_sack->ch.chunk_flags = flags;
10732		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10733	}
10734	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10735	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10736	asoc->ctrl_queue_cnt++;
10737	asoc->send_sack = 0;
10738	SCTP_STAT_INCR(sctps_sendsacks);
10739	return;
10740}
10741
10742void
10743sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10744#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10745    SCTP_UNUSED
10746#endif
10747)
10748{
10749	struct mbuf *m_abort, *m, *m_last;
10750	struct mbuf *m_out, *m_end = NULL;
10751	struct sctp_abort_chunk *abort;
10752	struct sctp_auth_chunk *auth = NULL;
10753	struct sctp_nets *net;
10754	uint32_t vtag;
10755	uint32_t auth_offset = 0;
10756	uint16_t cause_len, chunk_len, padding_len;
10757
10758	SCTP_TCB_LOCK_ASSERT(stcb);
10759	/*-
10760	 * Add an AUTH chunk, if chunk requires it and save the offset into
10761	 * the chain for AUTH
10762	 */
10763	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10764	    stcb->asoc.peer_auth_chunks)) {
10765		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10766		    stcb, SCTP_ABORT_ASSOCIATION);
10767		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10768	} else {
10769		m_out = NULL;
10770	}
10771	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10772	if (m_abort == NULL) {
10773		if (m_out) {
10774			sctp_m_freem(m_out);
10775		}
10776		if (operr) {
10777			sctp_m_freem(operr);
10778		}
10779		return;
10780	}
10781	/* link in any error */
10782	SCTP_BUF_NEXT(m_abort) = operr;
10783	cause_len = 0;
10784	m_last = NULL;
10785	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10786		cause_len += (uint16_t) SCTP_BUF_LEN(m);
10787		if (SCTP_BUF_NEXT(m) == NULL) {
10788			m_last = m;
10789		}
10790	}
10791	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10792	chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10793	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10794	if (m_out == NULL) {
10795		/* NO Auth chunk prepended, so reserve space in front */
10796		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10797		m_out = m_abort;
10798	} else {
10799		/* Put AUTH chunk at the front of the chain */
10800		SCTP_BUF_NEXT(m_end) = m_abort;
10801	}
10802	if (stcb->asoc.alternate) {
10803		net = stcb->asoc.alternate;
10804	} else {
10805		net = stcb->asoc.primary_destination;
10806	}
10807	/* Fill in the ABORT chunk header. */
10808	abort = mtod(m_abort, struct sctp_abort_chunk *);
10809	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10810	if (stcb->asoc.peer_vtag == 0) {
10811		/* This happens iff the assoc is in COOKIE-WAIT state. */
10812		vtag = stcb->asoc.my_vtag;
10813		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10814	} else {
10815		vtag = stcb->asoc.peer_vtag;
10816		abort->ch.chunk_flags = 0;
10817	}
10818	abort->ch.chunk_length = htons(chunk_len);
10819	/* Add padding, if necessary. */
10820	if (padding_len > 0) {
10821		if ((m_last == NULL) ||
10822		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10823			sctp_m_freem(m_out);
10824			return;
10825		}
10826	}
10827	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10828	    (struct sockaddr *)&net->ro._l_addr,
10829	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10830	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10831	    stcb->asoc.primary_destination->port, NULL,
10832	    0, 0,
10833	    so_locked);
10834	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10835}
10836
10837void
10838sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10839    struct sctp_nets *net,
10840    int reflect_vtag)
10841{
10842	/* formulate and SEND a SHUTDOWN-COMPLETE */
10843	struct mbuf *m_shutdown_comp;
10844	struct sctp_shutdown_complete_chunk *shutdown_complete;
10845	uint32_t vtag;
10846	uint8_t flags;
10847
10848	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10849	if (m_shutdown_comp == NULL) {
10850		/* no mbuf's */
10851		return;
10852	}
10853	if (reflect_vtag) {
10854		flags = SCTP_HAD_NO_TCB;
10855		vtag = stcb->asoc.my_vtag;
10856	} else {
10857		flags = 0;
10858		vtag = stcb->asoc.peer_vtag;
10859	}
10860	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10861	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10862	shutdown_complete->ch.chunk_flags = flags;
10863	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10864	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10865	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10866	    (struct sockaddr *)&net->ro._l_addr,
10867	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10868	    stcb->sctp_ep->sctp_lport, stcb->rport,
10869	    htonl(vtag),
10870	    net->port, NULL,
10871	    0, 0,
10872	    SCTP_SO_NOT_LOCKED);
10873	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10874	return;
10875}
10876
10877static void
10878sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10879    struct sctphdr *sh, uint32_t vtag,
10880    uint8_t type, struct mbuf *cause,
10881    uint8_t mflowtype, uint32_t mflowid,
10882    uint32_t vrf_id, uint16_t port)
10883{
10884	struct mbuf *o_pak;
10885	struct mbuf *mout;
10886	struct sctphdr *shout;
10887	struct sctp_chunkhdr *ch;
10888
10889#if defined(INET) || defined(INET6)
10890	struct udphdr *udp;
10891	int ret;
10892
10893#endif
10894	int len, cause_len, padding_len;
10895
10896#ifdef INET
10897	struct sockaddr_in *src_sin, *dst_sin;
10898	struct ip *ip;
10899
10900#endif
10901#ifdef INET6
10902	struct sockaddr_in6 *src_sin6, *dst_sin6;
10903	struct ip6_hdr *ip6;
10904
10905#endif
10906
10907	/* Compute the length of the cause and add final padding. */
10908	cause_len = 0;
10909	if (cause != NULL) {
10910		struct mbuf *m_at, *m_last = NULL;
10911
10912		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10913			if (SCTP_BUF_NEXT(m_at) == NULL)
10914				m_last = m_at;
10915			cause_len += SCTP_BUF_LEN(m_at);
10916		}
10917		padding_len = cause_len % 4;
10918		if (padding_len != 0) {
10919			padding_len = 4 - padding_len;
10920		}
10921		if (padding_len != 0) {
10922			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10923				sctp_m_freem(cause);
10924				return;
10925			}
10926		}
10927	} else {
10928		padding_len = 0;
10929	}
10930	/* Get an mbuf for the header. */
10931	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10932	switch (dst->sa_family) {
10933#ifdef INET
10934	case AF_INET:
10935		len += sizeof(struct ip);
10936		break;
10937#endif
10938#ifdef INET6
10939	case AF_INET6:
10940		len += sizeof(struct ip6_hdr);
10941		break;
10942#endif
10943	default:
10944		break;
10945	}
10946#if defined(INET) || defined(INET6)
10947	if (port) {
10948		len += sizeof(struct udphdr);
10949	}
10950#endif
10951	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
10952	if (mout == NULL) {
10953		if (cause) {
10954			sctp_m_freem(cause);
10955		}
10956		return;
10957	}
10958	SCTP_BUF_RESV_UF(mout, max_linkhdr);
10959	SCTP_BUF_LEN(mout) = len;
10960	SCTP_BUF_NEXT(mout) = cause;
10961	mout->m_pkthdr.flowid = mflowid;
10962	M_HASHTYPE_SET(mout, mflowtype);
10963#ifdef INET
10964	ip = NULL;
10965#endif
10966#ifdef INET6
10967	ip6 = NULL;
10968#endif
10969	switch (dst->sa_family) {
10970#ifdef INET
10971	case AF_INET:
10972		src_sin = (struct sockaddr_in *)src;
10973		dst_sin = (struct sockaddr_in *)dst;
10974		ip = mtod(mout, struct ip *);
10975		ip->ip_v = IPVERSION;
10976		ip->ip_hl = (sizeof(struct ip) >> 2);
10977		ip->ip_tos = 0;
10978		ip->ip_id = ip_newid();
10979		ip->ip_off = 0;
10980		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10981		if (port) {
10982			ip->ip_p = IPPROTO_UDP;
10983		} else {
10984			ip->ip_p = IPPROTO_SCTP;
10985		}
10986		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10987		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10988		ip->ip_sum = 0;
10989		len = sizeof(struct ip);
10990		shout = (struct sctphdr *)((caddr_t)ip + len);
10991		break;
10992#endif
10993#ifdef INET6
10994	case AF_INET6:
10995		src_sin6 = (struct sockaddr_in6 *)src;
10996		dst_sin6 = (struct sockaddr_in6 *)dst;
10997		ip6 = mtod(mout, struct ip6_hdr *);
10998		ip6->ip6_flow = htonl(0x60000000);
10999		if (V_ip6_auto_flowlabel) {
11000			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11001		}
11002		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11003		if (port) {
11004			ip6->ip6_nxt = IPPROTO_UDP;
11005		} else {
11006			ip6->ip6_nxt = IPPROTO_SCTP;
11007		}
11008		ip6->ip6_src = dst_sin6->sin6_addr;
11009		ip6->ip6_dst = src_sin6->sin6_addr;
11010		len = sizeof(struct ip6_hdr);
11011		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11012		break;
11013#endif
11014	default:
11015		len = 0;
11016		shout = mtod(mout, struct sctphdr *);
11017		break;
11018	}
11019#if defined(INET) || defined(INET6)
11020	if (port) {
11021		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11022			sctp_m_freem(mout);
11023			return;
11024		}
11025		udp = (struct udphdr *)shout;
11026		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11027		udp->uh_dport = port;
11028		udp->uh_sum = 0;
11029		udp->uh_ulen = htons(sizeof(struct udphdr) +
11030		    sizeof(struct sctphdr) +
11031		    sizeof(struct sctp_chunkhdr) +
11032		    cause_len + padding_len);
11033		len += sizeof(struct udphdr);
11034		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11035	} else {
11036		udp = NULL;
11037	}
11038#endif
11039	shout->src_port = sh->dest_port;
11040	shout->dest_port = sh->src_port;
11041	shout->checksum = 0;
11042	if (vtag) {
11043		shout->v_tag = htonl(vtag);
11044	} else {
11045		shout->v_tag = sh->v_tag;
11046	}
11047	len += sizeof(struct sctphdr);
11048	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11049	ch->chunk_type = type;
11050	if (vtag) {
11051		ch->chunk_flags = 0;
11052	} else {
11053		ch->chunk_flags = SCTP_HAD_NO_TCB;
11054	}
11055	ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11056	len += sizeof(struct sctp_chunkhdr);
11057	len += cause_len + padding_len;
11058
11059	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11060		sctp_m_freem(mout);
11061		return;
11062	}
11063	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11064	switch (dst->sa_family) {
11065#ifdef INET
11066	case AF_INET:
11067		if (port) {
11068			if (V_udp_cksum) {
11069				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11070			} else {
11071				udp->uh_sum = 0;
11072			}
11073		}
11074		ip->ip_len = htons(len);
11075		if (port) {
11076#if defined(SCTP_WITH_NO_CSUM)
11077			SCTP_STAT_INCR(sctps_sendnocrc);
11078#else
11079			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11080			SCTP_STAT_INCR(sctps_sendswcrc);
11081#endif
11082			if (V_udp_cksum) {
11083				SCTP_ENABLE_UDP_CSUM(o_pak);
11084			}
11085		} else {
11086#if defined(SCTP_WITH_NO_CSUM)
11087			SCTP_STAT_INCR(sctps_sendnocrc);
11088#else
11089			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11090			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11091			SCTP_STAT_INCR(sctps_sendhwcrc);
11092#endif
11093		}
11094#ifdef SCTP_PACKET_LOGGING
11095		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11096			sctp_packet_log(o_pak);
11097		}
11098#endif
11099		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11100		break;
11101#endif
11102#ifdef INET6
11103	case AF_INET6:
11104		ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11105		if (port) {
11106#if defined(SCTP_WITH_NO_CSUM)
11107			SCTP_STAT_INCR(sctps_sendnocrc);
11108#else
11109			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11110			SCTP_STAT_INCR(sctps_sendswcrc);
11111#endif
11112			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11113				udp->uh_sum = 0xffff;
11114			}
11115		} else {
11116#if defined(SCTP_WITH_NO_CSUM)
11117			SCTP_STAT_INCR(sctps_sendnocrc);
11118#else
11119			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11120			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11121			SCTP_STAT_INCR(sctps_sendhwcrc);
11122#endif
11123		}
11124#ifdef SCTP_PACKET_LOGGING
11125		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11126			sctp_packet_log(o_pak);
11127		}
11128#endif
11129		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11130		break;
11131#endif
11132	default:
11133		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11134		    dst->sa_family);
11135		sctp_m_freem(mout);
11136		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11137		return;
11138	}
11139	SCTP_STAT_INCR(sctps_sendpackets);
11140	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11141	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11142	return;
11143}
11144
11145void
11146sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11147    struct sctphdr *sh,
11148    uint8_t mflowtype, uint32_t mflowid,
11149    uint32_t vrf_id, uint16_t port)
11150{
11151	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11152	    mflowtype, mflowid,
11153	    vrf_id, port);
11154}
11155
11156void
11157sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11158#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11159    SCTP_UNUSED
11160#endif
11161)
11162{
11163	struct sctp_tmit_chunk *chk;
11164	struct sctp_heartbeat_chunk *hb;
11165	struct timeval now;
11166
11167	SCTP_TCB_LOCK_ASSERT(stcb);
11168	if (net == NULL) {
11169		return;
11170	}
11171	(void)SCTP_GETTIME_TIMEVAL(&now);
11172	switch (net->ro._l_addr.sa.sa_family) {
11173#ifdef INET
11174	case AF_INET:
11175		break;
11176#endif
11177#ifdef INET6
11178	case AF_INET6:
11179		break;
11180#endif
11181	default:
11182		return;
11183	}
11184	sctp_alloc_a_chunk(stcb, chk);
11185	if (chk == NULL) {
11186		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11187		return;
11188	}
11189	chk->copy_by_ref = 0;
11190	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11191	chk->rec.chunk_id.can_take_data = 1;
11192	chk->flags = 0;
11193	chk->asoc = &stcb->asoc;
11194	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11195
11196	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11197	if (chk->data == NULL) {
11198		sctp_free_a_chunk(stcb, chk, so_locked);
11199		return;
11200	}
11201	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11202	SCTP_BUF_LEN(chk->data) = chk->send_size;
11203	chk->sent = SCTP_DATAGRAM_UNSENT;
11204	chk->snd_count = 0;
11205	chk->whoTo = net;
11206	atomic_add_int(&chk->whoTo->ref_count, 1);
11207	/* Now we have a mbuf that we can fill in with the details */
11208	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11209	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11210	/* fill out chunk header */
11211	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11212	hb->ch.chunk_flags = 0;
11213	hb->ch.chunk_length = htons(chk->send_size);
11214	/* Fill out hb parameter */
11215	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11216	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11217	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11218	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11219	/* Did our user request this one, put it in */
11220	hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11221	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11222	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11223		/*
11224		 * we only take from the entropy pool if the address is not
11225		 * confirmed.
11226		 */
11227		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11228		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11229	} else {
11230		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11231		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11232	}
11233	switch (net->ro._l_addr.sa.sa_family) {
11234#ifdef INET
11235	case AF_INET:
11236		memcpy(hb->heartbeat.hb_info.address,
11237		    &net->ro._l_addr.sin.sin_addr,
11238		    sizeof(net->ro._l_addr.sin.sin_addr));
11239		break;
11240#endif
11241#ifdef INET6
11242	case AF_INET6:
11243		memcpy(hb->heartbeat.hb_info.address,
11244		    &net->ro._l_addr.sin6.sin6_addr,
11245		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11246		break;
11247#endif
11248	default:
11249		return;
11250		break;
11251	}
11252	net->hb_responded = 0;
11253	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11254	stcb->asoc.ctrl_queue_cnt++;
11255	SCTP_STAT_INCR(sctps_sendheartbeat);
11256	return;
11257}
11258
11259void
11260sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11261    uint32_t high_tsn)
11262{
11263	struct sctp_association *asoc;
11264	struct sctp_ecne_chunk *ecne;
11265	struct sctp_tmit_chunk *chk;
11266
11267	if (net == NULL) {
11268		return;
11269	}
11270	asoc = &stcb->asoc;
11271	SCTP_TCB_LOCK_ASSERT(stcb);
11272	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11273		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11274			/* found a previous ECN_ECHO update it if needed */
11275			uint32_t cnt, ctsn;
11276
11277			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11278			ctsn = ntohl(ecne->tsn);
11279			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11280				ecne->tsn = htonl(high_tsn);
11281				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11282			}
11283			cnt = ntohl(ecne->num_pkts_since_cwr);
11284			cnt++;
11285			ecne->num_pkts_since_cwr = htonl(cnt);
11286			return;
11287		}
11288	}
11289	/* nope could not find one to update so we must build one */
11290	sctp_alloc_a_chunk(stcb, chk);
11291	if (chk == NULL) {
11292		return;
11293	}
11294	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11295	chk->copy_by_ref = 0;
11296	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11297	chk->rec.chunk_id.can_take_data = 0;
11298	chk->flags = 0;
11299	chk->asoc = &stcb->asoc;
11300	chk->send_size = sizeof(struct sctp_ecne_chunk);
11301	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11302	if (chk->data == NULL) {
11303		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11304		return;
11305	}
11306	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11307	SCTP_BUF_LEN(chk->data) = chk->send_size;
11308	chk->sent = SCTP_DATAGRAM_UNSENT;
11309	chk->snd_count = 0;
11310	chk->whoTo = net;
11311	atomic_add_int(&chk->whoTo->ref_count, 1);
11312
11313	stcb->asoc.ecn_echo_cnt_onq++;
11314	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11315	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11316	ecne->ch.chunk_flags = 0;
11317	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11318	ecne->tsn = htonl(high_tsn);
11319	ecne->num_pkts_since_cwr = htonl(1);
11320	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11321	asoc->ctrl_queue_cnt++;
11322}
11323
11324void
11325sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11326    struct mbuf *m, int len, int iphlen, int bad_crc)
11327{
11328	struct sctp_association *asoc;
11329	struct sctp_pktdrop_chunk *drp;
11330	struct sctp_tmit_chunk *chk;
11331	uint8_t *datap;
11332	int was_trunc = 0;
11333	int fullsz = 0;
11334	long spc;
11335	int offset;
11336	struct sctp_chunkhdr *ch, chunk_buf;
11337	unsigned int chk_length;
11338
11339	if (!stcb) {
11340		return;
11341	}
11342	asoc = &stcb->asoc;
11343	SCTP_TCB_LOCK_ASSERT(stcb);
11344	if (asoc->pktdrop_supported == 0) {
11345		/*-
11346		 * peer must declare support before I send one.
11347		 */
11348		return;
11349	}
11350	if (stcb->sctp_socket == NULL) {
11351		return;
11352	}
11353	sctp_alloc_a_chunk(stcb, chk);
11354	if (chk == NULL) {
11355		return;
11356	}
11357	chk->copy_by_ref = 0;
11358	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11359	chk->rec.chunk_id.can_take_data = 1;
11360	chk->flags = 0;
11361	len -= iphlen;
11362	chk->send_size = len;
11363	/* Validate that we do not have an ABORT in here. */
11364	offset = iphlen + sizeof(struct sctphdr);
11365	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11366	    sizeof(*ch), (uint8_t *) & chunk_buf);
11367	while (ch != NULL) {
11368		chk_length = ntohs(ch->chunk_length);
11369		if (chk_length < sizeof(*ch)) {
11370			/* break to abort land */
11371			break;
11372		}
11373		switch (ch->chunk_type) {
11374		case SCTP_PACKET_DROPPED:
11375		case SCTP_ABORT_ASSOCIATION:
11376		case SCTP_INITIATION_ACK:
11377			/**
11378			 * We don't respond with an PKT-DROP to an ABORT
11379			 * or PKT-DROP. We also do not respond to an
11380			 * INIT-ACK, because we can't know if the initiation
11381			 * tag is correct or not.
11382			 */
11383			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11384			return;
11385		default:
11386			break;
11387		}
11388		offset += SCTP_SIZE32(chk_length);
11389		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11390		    sizeof(*ch), (uint8_t *) & chunk_buf);
11391	}
11392
11393	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11394	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11395		/*
11396		 * only send 1 mtu worth, trim off the excess on the end.
11397		 */
11398		fullsz = len;
11399		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11400		was_trunc = 1;
11401	}
11402	chk->asoc = &stcb->asoc;
11403	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11404	if (chk->data == NULL) {
11405jump_out:
11406		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11407		return;
11408	}
11409	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11410	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11411	if (drp == NULL) {
11412		sctp_m_freem(chk->data);
11413		chk->data = NULL;
11414		goto jump_out;
11415	}
11416	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11417	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11418	chk->book_size_scale = 0;
11419	if (was_trunc) {
11420		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11421		drp->trunc_len = htons(fullsz);
11422		/*
11423		 * Len is already adjusted to size minus overhead above take
11424		 * out the pkt_drop chunk itself from it.
11425		 */
11426		chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11427		len = chk->send_size;
11428	} else {
11429		/* no truncation needed */
11430		drp->ch.chunk_flags = 0;
11431		drp->trunc_len = htons(0);
11432	}
11433	if (bad_crc) {
11434		drp->ch.chunk_flags |= SCTP_BADCRC;
11435	}
11436	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11437	SCTP_BUF_LEN(chk->data) = chk->send_size;
11438	chk->sent = SCTP_DATAGRAM_UNSENT;
11439	chk->snd_count = 0;
11440	if (net) {
11441		/* we should hit here */
11442		chk->whoTo = net;
11443		atomic_add_int(&chk->whoTo->ref_count, 1);
11444	} else {
11445		chk->whoTo = NULL;
11446	}
11447	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11448	drp->ch.chunk_length = htons(chk->send_size);
11449	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11450	if (spc < 0) {
11451		spc = 0;
11452	}
11453	drp->bottle_bw = htonl(spc);
11454	if (asoc->my_rwnd) {
11455		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11456		    asoc->size_on_all_streams +
11457		    asoc->my_rwnd_control_len +
11458		    stcb->sctp_socket->so_rcv.sb_cc);
11459	} else {
11460		/*-
11461		 * If my rwnd is 0, possibly from mbuf depletion as well as
11462		 * space used, tell the peer there is NO space aka onq == bw
11463		 */
11464		drp->current_onq = htonl(spc);
11465	}
11466	drp->reserved = 0;
11467	datap = drp->data;
11468	m_copydata(m, iphlen, len, (caddr_t)datap);
11469	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11470	asoc->ctrl_queue_cnt++;
11471}
11472
11473void
11474sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11475{
11476	struct sctp_association *asoc;
11477	struct sctp_cwr_chunk *cwr;
11478	struct sctp_tmit_chunk *chk;
11479
11480	SCTP_TCB_LOCK_ASSERT(stcb);
11481	if (net == NULL) {
11482		return;
11483	}
11484	asoc = &stcb->asoc;
11485	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11486		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11487			/*
11488			 * found a previous CWR queued to same destination
11489			 * update it if needed
11490			 */
11491			uint32_t ctsn;
11492
11493			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11494			ctsn = ntohl(cwr->tsn);
11495			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11496				cwr->tsn = htonl(high_tsn);
11497			}
11498			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11499				/* Make sure override is carried */
11500				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11501			}
11502			return;
11503		}
11504	}
11505	sctp_alloc_a_chunk(stcb, chk);
11506	if (chk == NULL) {
11507		return;
11508	}
11509	chk->copy_by_ref = 0;
11510	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11511	chk->rec.chunk_id.can_take_data = 1;
11512	chk->flags = 0;
11513	chk->asoc = &stcb->asoc;
11514	chk->send_size = sizeof(struct sctp_cwr_chunk);
11515	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11516	if (chk->data == NULL) {
11517		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11518		return;
11519	}
11520	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11521	SCTP_BUF_LEN(chk->data) = chk->send_size;
11522	chk->sent = SCTP_DATAGRAM_UNSENT;
11523	chk->snd_count = 0;
11524	chk->whoTo = net;
11525	atomic_add_int(&chk->whoTo->ref_count, 1);
11526	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11527	cwr->ch.chunk_type = SCTP_ECN_CWR;
11528	cwr->ch.chunk_flags = override;
11529	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11530	cwr->tsn = htonl(high_tsn);
11531	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11532	asoc->ctrl_queue_cnt++;
11533}
11534
11535void
11536sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11537    int number_entries, uint16_t * list,
11538    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11539{
11540	uint16_t len, old_len, i;
11541	struct sctp_stream_reset_out_request *req_out;
11542	struct sctp_chunkhdr *ch;
11543
11544	ch = mtod(chk->data, struct sctp_chunkhdr *);
11545	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11546
11547	/* get to new offset for the param. */
11548	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11549	/* now how long will this param be? */
11550	len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11551	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11552	req_out->ph.param_length = htons(len);
11553	req_out->request_seq = htonl(seq);
11554	req_out->response_seq = htonl(resp_seq);
11555	req_out->send_reset_at_tsn = htonl(last_sent);
11556	if (number_entries) {
11557		for (i = 0; i < number_entries; i++) {
11558			req_out->list_of_streams[i] = htons(list[i]);
11559		}
11560	}
11561	if (SCTP_SIZE32(len) > len) {
11562		/*-
11563		 * Need to worry about the pad we may end up adding to the
11564		 * end. This is easy since the struct is either aligned to 4
11565		 * bytes or 2 bytes off.
11566		 */
11567		req_out->list_of_streams[number_entries] = 0;
11568	}
11569	/* now fix the chunk length */
11570	ch->chunk_length = htons(len + old_len);
11571	chk->book_size = len + old_len;
11572	chk->book_size_scale = 0;
11573	chk->send_size = SCTP_SIZE32(chk->book_size);
11574	SCTP_BUF_LEN(chk->data) = chk->send_size;
11575	return;
11576}
11577
11578static void
11579sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11580    int number_entries, uint16_t * list,
11581    uint32_t seq)
11582{
11583	uint16_t len, old_len, i;
11584	struct sctp_stream_reset_in_request *req_in;
11585	struct sctp_chunkhdr *ch;
11586
11587	ch = mtod(chk->data, struct sctp_chunkhdr *);
11588	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11589
11590	/* get to new offset for the param. */
11591	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11592	/* now how long will this param be? */
11593	len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11594	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11595	req_in->ph.param_length = htons(len);
11596	req_in->request_seq = htonl(seq);
11597	if (number_entries) {
11598		for (i = 0; i < number_entries; i++) {
11599			req_in->list_of_streams[i] = htons(list[i]);
11600		}
11601	}
11602	if (SCTP_SIZE32(len) > len) {
11603		/*-
11604		 * Need to worry about the pad we may end up adding to the
11605		 * end. This is easy since the struct is either aligned to 4
11606		 * bytes or 2 bytes off.
11607		 */
11608		req_in->list_of_streams[number_entries] = 0;
11609	}
11610	/* now fix the chunk length */
11611	ch->chunk_length = htons(len + old_len);
11612	chk->book_size = len + old_len;
11613	chk->book_size_scale = 0;
11614	chk->send_size = SCTP_SIZE32(chk->book_size);
11615	SCTP_BUF_LEN(chk->data) = chk->send_size;
11616	return;
11617}
11618
11619static void
11620sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11621    uint32_t seq)
11622{
11623	uint16_t len, old_len;
11624	struct sctp_stream_reset_tsn_request *req_tsn;
11625	struct sctp_chunkhdr *ch;
11626
11627	ch = mtod(chk->data, struct sctp_chunkhdr *);
11628	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11629
11630	/* get to new offset for the param. */
11631	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11632	/* now how long will this param be? */
11633	len = sizeof(struct sctp_stream_reset_tsn_request);
11634	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11635	req_tsn->ph.param_length = htons(len);
11636	req_tsn->request_seq = htonl(seq);
11637
11638	/* now fix the chunk length */
11639	ch->chunk_length = htons(len + old_len);
11640	chk->send_size = len + old_len;
11641	chk->book_size = SCTP_SIZE32(chk->send_size);
11642	chk->book_size_scale = 0;
11643	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11644	return;
11645}
11646
11647void
11648sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11649    uint32_t resp_seq, uint32_t result)
11650{
11651	uint16_t len, old_len;
11652	struct sctp_stream_reset_response *resp;
11653	struct sctp_chunkhdr *ch;
11654
11655	ch = mtod(chk->data, struct sctp_chunkhdr *);
11656	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11657
11658	/* get to new offset for the param. */
11659	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11660	/* now how long will this param be? */
11661	len = sizeof(struct sctp_stream_reset_response);
11662	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11663	resp->ph.param_length = htons(len);
11664	resp->response_seq = htonl(resp_seq);
11665	resp->result = ntohl(result);
11666
11667	/* now fix the chunk length */
11668	ch->chunk_length = htons(len + old_len);
11669	chk->book_size = len + old_len;
11670	chk->book_size_scale = 0;
11671	chk->send_size = SCTP_SIZE32(chk->book_size);
11672	SCTP_BUF_LEN(chk->data) = chk->send_size;
11673	return;
11674}
11675
11676void
11677sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11678    uint32_t resp_seq, uint32_t result,
11679    uint32_t send_una, uint32_t recv_next)
11680{
11681	uint16_t len, old_len;
11682	struct sctp_stream_reset_response_tsn *resp;
11683	struct sctp_chunkhdr *ch;
11684
11685	ch = mtod(chk->data, struct sctp_chunkhdr *);
11686	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11687
11688	/* get to new offset for the param. */
11689	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11690	/* now how long will this param be? */
11691	len = sizeof(struct sctp_stream_reset_response_tsn);
11692	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11693	resp->ph.param_length = htons(len);
11694	resp->response_seq = htonl(resp_seq);
11695	resp->result = htonl(result);
11696	resp->senders_next_tsn = htonl(send_una);
11697	resp->receivers_next_tsn = htonl(recv_next);
11698
11699	/* now fix the chunk length */
11700	ch->chunk_length = htons(len + old_len);
11701	chk->book_size = len + old_len;
11702	chk->send_size = SCTP_SIZE32(chk->book_size);
11703	chk->book_size_scale = 0;
11704	SCTP_BUF_LEN(chk->data) = chk->send_size;
11705	return;
11706}
11707
11708static void
11709sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11710    uint32_t seq,
11711    uint16_t adding)
11712{
11713	uint16_t len, old_len;
11714	struct sctp_chunkhdr *ch;
11715	struct sctp_stream_reset_add_strm *addstr;
11716
11717	ch = mtod(chk->data, struct sctp_chunkhdr *);
11718	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11719
11720	/* get to new offset for the param. */
11721	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11722	/* now how long will this param be? */
11723	len = sizeof(struct sctp_stream_reset_add_strm);
11724
11725	/* Fill it out. */
11726	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11727	addstr->ph.param_length = htons(len);
11728	addstr->request_seq = htonl(seq);
11729	addstr->number_of_streams = htons(adding);
11730	addstr->reserved = 0;
11731
11732	/* now fix the chunk length */
11733	ch->chunk_length = htons(len + old_len);
11734	chk->send_size = len + old_len;
11735	chk->book_size = SCTP_SIZE32(chk->send_size);
11736	chk->book_size_scale = 0;
11737	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11738	return;
11739}
11740
11741static void
11742sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11743    uint32_t seq,
11744    uint16_t adding)
11745{
11746	uint16_t len, old_len;
11747	struct sctp_chunkhdr *ch;
11748	struct sctp_stream_reset_add_strm *addstr;
11749
11750	ch = mtod(chk->data, struct sctp_chunkhdr *);
11751	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11752
11753	/* get to new offset for the param. */
11754	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11755	/* now how long will this param be? */
11756	len = sizeof(struct sctp_stream_reset_add_strm);
11757	/* Fill it out. */
11758	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11759	addstr->ph.param_length = htons(len);
11760	addstr->request_seq = htonl(seq);
11761	addstr->number_of_streams = htons(adding);
11762	addstr->reserved = 0;
11763
11764	/* now fix the chunk length */
11765	ch->chunk_length = htons(len + old_len);
11766	chk->send_size = len + old_len;
11767	chk->book_size = SCTP_SIZE32(chk->send_size);
11768	chk->book_size_scale = 0;
11769	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11770	return;
11771}
11772
11773int
11774sctp_send_str_reset_req(struct sctp_tcb *stcb,
11775    uint16_t number_entries, uint16_t * list,
11776    uint8_t send_out_req,
11777    uint8_t send_in_req,
11778    uint8_t send_tsn_req,
11779    uint8_t add_stream,
11780    uint16_t adding_o,
11781    uint16_t adding_i, uint8_t peer_asked)
11782{
11783
11784	struct sctp_association *asoc;
11785	struct sctp_tmit_chunk *chk;
11786	struct sctp_chunkhdr *ch;
11787	uint32_t seq;
11788
11789	asoc = &stcb->asoc;
11790	if (asoc->stream_reset_outstanding) {
11791		/*-
11792		 * Already one pending, must get ACK back to clear the flag.
11793		 */
11794		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11795		return (EBUSY);
11796	}
11797	if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11798	    (add_stream == 0)) {
11799		/* nothing to do */
11800		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11801		return (EINVAL);
11802	}
11803	if (send_tsn_req && (send_out_req || send_in_req)) {
11804		/* error, can't do that */
11805		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11806		return (EINVAL);
11807	}
11808	if (number_entries > (MCLBYTES -
11809	    SCTP_MIN_OVERHEAD -
11810	    sizeof(struct sctp_chunkhdr) -
11811	    sizeof(struct sctp_stream_reset_out_request)) /
11812	    sizeof(uint16_t)) {
11813		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11814		return (ENOMEM);
11815	}
11816	sctp_alloc_a_chunk(stcb, chk);
11817	if (chk == NULL) {
11818		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11819		return (ENOMEM);
11820	}
11821	chk->copy_by_ref = 0;
11822	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11823	chk->rec.chunk_id.can_take_data = 0;
11824	chk->flags = 0;
11825	chk->asoc = &stcb->asoc;
11826	chk->book_size = sizeof(struct sctp_chunkhdr);
11827	chk->send_size = SCTP_SIZE32(chk->book_size);
11828	chk->book_size_scale = 0;
11829
11830	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11831	if (chk->data == NULL) {
11832		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11833		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11834		return (ENOMEM);
11835	}
11836	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11837
11838	/* setup chunk parameters */
11839	chk->sent = SCTP_DATAGRAM_UNSENT;
11840	chk->snd_count = 0;
11841	if (stcb->asoc.alternate) {
11842		chk->whoTo = stcb->asoc.alternate;
11843	} else {
11844		chk->whoTo = stcb->asoc.primary_destination;
11845	}
11846	atomic_add_int(&chk->whoTo->ref_count, 1);
11847	ch = mtod(chk->data, struct sctp_chunkhdr *);
11848	ch->chunk_type = SCTP_STREAM_RESET;
11849	ch->chunk_flags = 0;
11850	ch->chunk_length = htons(chk->book_size);
11851	SCTP_BUF_LEN(chk->data) = chk->send_size;
11852
11853	seq = stcb->asoc.str_reset_seq_out;
11854	if (send_out_req) {
11855		sctp_add_stream_reset_out(chk, number_entries, list,
11856		    seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11857		asoc->stream_reset_out_is_outstanding = 1;
11858		seq++;
11859		asoc->stream_reset_outstanding++;
11860	}
11861	if ((add_stream & 1) &&
11862	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11863		/* Need to allocate more */
11864		struct sctp_stream_out *oldstream;
11865		struct sctp_stream_queue_pending *sp, *nsp;
11866		int i;
11867
11868#if defined(SCTP_DETAILED_STR_STATS)
11869		int j;
11870
11871#endif
11872
11873		oldstream = stcb->asoc.strmout;
11874		/* get some more */
11875		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11876		    ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11877		    SCTP_M_STRMO);
11878		if (stcb->asoc.strmout == NULL) {
11879			uint8_t x;
11880
11881			stcb->asoc.strmout = oldstream;
11882			/* Turn off the bit */
11883			x = add_stream & 0xfe;
11884			add_stream = x;
11885			goto skip_stuff;
11886		}
11887		/*
11888		 * Ok now we proceed with copying the old out stuff and
11889		 * initializing the new stuff.
11890		 */
11891		SCTP_TCB_SEND_LOCK(stcb);
11892		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11893		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11894			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11895			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11896			stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11897			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11898			stcb->asoc.strmout[i].stream_no = i;
11899			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11900			/* now anything on those queues? */
11901			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11902				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11903				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11904			}
11905			/* Now move assoc pointers too */
11906			if (stcb->asoc.last_out_stream == &oldstream[i]) {
11907				stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11908			}
11909			if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11910				stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11911			}
11912		}
11913		/* now the new streams */
11914		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11915		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11916			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11917			stcb->asoc.strmout[i].chunks_on_queues = 0;
11918#if defined(SCTP_DETAILED_STR_STATS)
11919			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
11920				stcb->asoc.strmout[i].abandoned_sent[j] = 0;
11921				stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
11922			}
11923#else
11924			stcb->asoc.strmout[i].abandoned_sent[0] = 0;
11925			stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
11926#endif
11927			stcb->asoc.strmout[i].next_sequence_send = 0x0;
11928			stcb->asoc.strmout[i].stream_no = i;
11929			stcb->asoc.strmout[i].last_msg_incomplete = 0;
11930			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11931		}
11932		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11933		SCTP_FREE(oldstream, SCTP_M_STRMO);
11934		SCTP_TCB_SEND_UNLOCK(stcb);
11935	}
11936skip_stuff:
11937	if ((add_stream & 1) && (adding_o > 0)) {
11938		asoc->strm_pending_add_size = adding_o;
11939		asoc->peer_req_out = peer_asked;
11940		sctp_add_an_out_stream(chk, seq, adding_o);
11941		seq++;
11942		asoc->stream_reset_outstanding++;
11943	}
11944	if ((add_stream & 2) && (adding_i > 0)) {
11945		sctp_add_an_in_stream(chk, seq, adding_i);
11946		seq++;
11947		asoc->stream_reset_outstanding++;
11948	}
11949	if (send_in_req) {
11950		sctp_add_stream_reset_in(chk, number_entries, list, seq);
11951		seq++;
11952		asoc->stream_reset_outstanding++;
11953	}
11954	if (send_tsn_req) {
11955		sctp_add_stream_reset_tsn(chk, seq);
11956		asoc->stream_reset_outstanding++;
11957	}
11958	asoc->str_reset = chk;
11959	/* insert the chunk for sending */
11960	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11961	    chk,
11962	    sctp_next);
11963	asoc->ctrl_queue_cnt++;
11964	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11965	return (0);
11966}
11967
11968void
11969sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11970    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11971    uint8_t mflowtype, uint32_t mflowid,
11972    uint32_t vrf_id, uint16_t port)
11973{
11974	/* Don't respond to an ABORT with an ABORT. */
11975	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11976		if (cause)
11977			sctp_m_freem(cause);
11978		return;
11979	}
11980	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11981	    mflowtype, mflowid,
11982	    vrf_id, port);
11983	return;
11984}
11985
11986void
11987sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11988    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11989    uint8_t mflowtype, uint32_t mflowid,
11990    uint32_t vrf_id, uint16_t port)
11991{
11992	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11993	    mflowtype, mflowid,
11994	    vrf_id, port);
11995	return;
11996}
11997
11998static struct mbuf *
11999sctp_copy_resume(struct uio *uio,
12000    int max_send_len,
12001    int user_marks_eor,
12002    int *error,
12003    uint32_t * sndout,
12004    struct mbuf **new_tail)
12005{
12006	struct mbuf *m;
12007
12008	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12009	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12010	if (m == NULL) {
12011		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12012		*error = ENOBUFS;
12013	} else {
12014		*sndout = m_length(m, NULL);
12015		*new_tail = m_last(m);
12016	}
12017	return (m);
12018}
12019
12020static int
12021sctp_copy_one(struct sctp_stream_queue_pending *sp,
12022    struct uio *uio,
12023    int resv_upfront)
12024{
12025	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12026	    resv_upfront, 0);
12027	if (sp->data == NULL) {
12028		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12029		return (ENOBUFS);
12030	}
12031	sp->tail_mbuf = m_last(sp->data);
12032	return (0);
12033}
12034
12035
12036
12037static struct sctp_stream_queue_pending *
12038sctp_copy_it_in(struct sctp_tcb *stcb,
12039    struct sctp_association *asoc,
12040    struct sctp_sndrcvinfo *srcv,
12041    struct uio *uio,
12042    struct sctp_nets *net,
12043    int max_send_len,
12044    int user_marks_eor,
12045    int *error)
12046{
12047	/*-
12048	 * This routine must be very careful in its work. Protocol
12049	 * processing is up and running so care must be taken to spl...()
12050	 * when you need to do something that may effect the stcb/asoc. The
12051	 * sb is locked however. When data is copied the protocol processing
12052	 * should be enabled since this is a slower operation...
12053	 */
12054	struct sctp_stream_queue_pending *sp = NULL;
12055	int resv_in_first;
12056
12057	*error = 0;
12058	/* Now can we send this? */
12059	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12060	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12061	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12062	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12063		/* got data while shutting down */
12064		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12065		*error = ECONNRESET;
12066		goto out_now;
12067	}
12068	sctp_alloc_a_strmoq(stcb, sp);
12069	if (sp == NULL) {
12070		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12071		*error = ENOMEM;
12072		goto out_now;
12073	}
12074	sp->act_flags = 0;
12075	sp->sender_all_done = 0;
12076	sp->sinfo_flags = srcv->sinfo_flags;
12077	sp->timetolive = srcv->sinfo_timetolive;
12078	sp->ppid = srcv->sinfo_ppid;
12079	sp->context = srcv->sinfo_context;
12080	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12081
12082	sp->stream = srcv->sinfo_stream;
12083	sp->length = min(uio->uio_resid, max_send_len);
12084	if ((sp->length == (uint32_t) uio->uio_resid) &&
12085	    ((user_marks_eor == 0) ||
12086	    (srcv->sinfo_flags & SCTP_EOF) ||
12087	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12088		sp->msg_is_complete = 1;
12089	} else {
12090		sp->msg_is_complete = 0;
12091	}
12092	sp->sender_all_done = 0;
12093	sp->some_taken = 0;
12094	sp->put_last_out = 0;
12095	resv_in_first = sizeof(struct sctp_data_chunk);
12096	sp->data = sp->tail_mbuf = NULL;
12097	if (sp->length == 0) {
12098		*error = 0;
12099		goto skip_copy;
12100	}
12101	if (srcv->sinfo_keynumber_valid) {
12102		sp->auth_keyid = srcv->sinfo_keynumber;
12103	} else {
12104		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12105	}
12106	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12107		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12108		sp->holds_key_ref = 1;
12109	}
12110	*error = sctp_copy_one(sp, uio, resv_in_first);
12111skip_copy:
12112	if (*error) {
12113		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12114		sp = NULL;
12115	} else {
12116		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12117			sp->net = net;
12118			atomic_add_int(&sp->net->ref_count, 1);
12119		} else {
12120			sp->net = NULL;
12121		}
12122		sctp_set_prsctp_policy(sp);
12123	}
12124out_now:
12125	return (sp);
12126}
12127
12128
12129int
12130sctp_sosend(struct socket *so,
12131    struct sockaddr *addr,
12132    struct uio *uio,
12133    struct mbuf *top,
12134    struct mbuf *control,
12135    int flags,
12136    struct thread *p
12137)
12138{
12139	int error, use_sndinfo = 0;
12140	struct sctp_sndrcvinfo sndrcvninfo;
12141	struct sockaddr *addr_to_use;
12142
12143#if defined(INET) && defined(INET6)
12144	struct sockaddr_in sin;
12145
12146#endif
12147
12148	if (control) {
12149		/* process cmsg snd/rcv info (maybe a assoc-id) */
12150		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12151		    sizeof(sndrcvninfo))) {
12152			/* got one */
12153			use_sndinfo = 1;
12154		}
12155	}
12156	addr_to_use = addr;
12157#if defined(INET) && defined(INET6)
12158	if ((addr) && (addr->sa_family == AF_INET6)) {
12159		struct sockaddr_in6 *sin6;
12160
12161		sin6 = (struct sockaddr_in6 *)addr;
12162		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12163			in6_sin6_2_sin(&sin, sin6);
12164			addr_to_use = (struct sockaddr *)&sin;
12165		}
12166	}
12167#endif
12168	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12169	    control,
12170	    flags,
12171	    use_sndinfo ? &sndrcvninfo : NULL
12172	    ,p
12173	    );
12174	return (error);
12175}
12176
12177
12178int
12179sctp_lower_sosend(struct socket *so,
12180    struct sockaddr *addr,
12181    struct uio *uio,
12182    struct mbuf *i_pak,
12183    struct mbuf *control,
12184    int flags,
12185    struct sctp_sndrcvinfo *srcv
12186    ,
12187    struct thread *p
12188)
12189{
12190	unsigned int sndlen = 0, max_len;
12191	int error, len;
12192	struct mbuf *top = NULL;
12193	int queue_only = 0, queue_only_for_init = 0;
12194	int free_cnt_applied = 0;
12195	int un_sent;
12196	int now_filled = 0;
12197	unsigned int inqueue_bytes = 0;
12198	struct sctp_block_entry be;
12199	struct sctp_inpcb *inp;
12200	struct sctp_tcb *stcb = NULL;
12201	struct timeval now;
12202	struct sctp_nets *net;
12203	struct sctp_association *asoc;
12204	struct sctp_inpcb *t_inp;
12205	int user_marks_eor;
12206	int create_lock_applied = 0;
12207	int nagle_applies = 0;
12208	int some_on_control = 0;
12209	int got_all_of_the_send = 0;
12210	int hold_tcblock = 0;
12211	int non_blocking = 0;
12212	uint32_t local_add_more, local_soresv = 0;
12213	uint16_t port;
12214	uint16_t sinfo_flags;
12215	sctp_assoc_t sinfo_assoc_id;
12216
12217	error = 0;
12218	net = NULL;
12219	stcb = NULL;
12220	asoc = NULL;
12221
12222	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12223	if (inp == NULL) {
12224		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12225		error = EINVAL;
12226		if (i_pak) {
12227			SCTP_RELEASE_PKT(i_pak);
12228		}
12229		return (error);
12230	}
12231	if ((uio == NULL) && (i_pak == NULL)) {
12232		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12233		return (EINVAL);
12234	}
12235	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12236	atomic_add_int(&inp->total_sends, 1);
12237	if (uio) {
12238		if (uio->uio_resid < 0) {
12239			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12240			return (EINVAL);
12241		}
12242		sndlen = uio->uio_resid;
12243	} else {
12244		top = SCTP_HEADER_TO_CHAIN(i_pak);
12245		sndlen = SCTP_HEADER_LEN(i_pak);
12246	}
12247	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12248	    (void *)addr,
12249	    sndlen);
12250	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12251	    (inp->sctp_socket->so_qlimit)) {
12252		/* The listener can NOT send */
12253		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12254		error = ENOTCONN;
12255		goto out_unlocked;
12256	}
12257	/**
12258	 * Pre-screen address, if one is given the sin-len
12259	 * must be set correctly!
12260	 */
12261	if (addr) {
12262		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12263
12264		switch (raddr->sa.sa_family) {
12265#ifdef INET
12266		case AF_INET:
12267			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12268				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12269				error = EINVAL;
12270				goto out_unlocked;
12271			}
12272			port = raddr->sin.sin_port;
12273			break;
12274#endif
12275#ifdef INET6
12276		case AF_INET6:
12277			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12278				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12279				error = EINVAL;
12280				goto out_unlocked;
12281			}
12282			port = raddr->sin6.sin6_port;
12283			break;
12284#endif
12285		default:
12286			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12287			error = EAFNOSUPPORT;
12288			goto out_unlocked;
12289		}
12290	} else
12291		port = 0;
12292
12293	if (srcv) {
12294		sinfo_flags = srcv->sinfo_flags;
12295		sinfo_assoc_id = srcv->sinfo_assoc_id;
12296		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12297		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12298			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12299			error = EINVAL;
12300			goto out_unlocked;
12301		}
12302		if (srcv->sinfo_flags)
12303			SCTP_STAT_INCR(sctps_sends_with_flags);
12304	} else {
12305		sinfo_flags = inp->def_send.sinfo_flags;
12306		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12307	}
12308	if (sinfo_flags & SCTP_SENDALL) {
12309		/* its a sendall */
12310		error = sctp_sendall(inp, uio, top, srcv);
12311		top = NULL;
12312		goto out_unlocked;
12313	}
12314	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12315		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12316		error = EINVAL;
12317		goto out_unlocked;
12318	}
12319	/* now we must find the assoc */
12320	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12321	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12322		SCTP_INP_RLOCK(inp);
12323		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12324		if (stcb) {
12325			SCTP_TCB_LOCK(stcb);
12326			hold_tcblock = 1;
12327		}
12328		SCTP_INP_RUNLOCK(inp);
12329	} else if (sinfo_assoc_id) {
12330		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12331	} else if (addr) {
12332		/*-
12333		 * Since we did not use findep we must
12334		 * increment it, and if we don't find a tcb
12335		 * decrement it.
12336		 */
12337		SCTP_INP_WLOCK(inp);
12338		SCTP_INP_INCR_REF(inp);
12339		SCTP_INP_WUNLOCK(inp);
12340		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12341		if (stcb == NULL) {
12342			SCTP_INP_WLOCK(inp);
12343			SCTP_INP_DECR_REF(inp);
12344			SCTP_INP_WUNLOCK(inp);
12345		} else {
12346			hold_tcblock = 1;
12347		}
12348	}
12349	if ((stcb == NULL) && (addr)) {
12350		/* Possible implicit send? */
12351		SCTP_ASOC_CREATE_LOCK(inp);
12352		create_lock_applied = 1;
12353		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12354		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12355			/* Should I really unlock ? */
12356			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12357			error = EINVAL;
12358			goto out_unlocked;
12359
12360		}
12361		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12362		    (addr->sa_family == AF_INET6)) {
12363			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12364			error = EINVAL;
12365			goto out_unlocked;
12366		}
12367		SCTP_INP_WLOCK(inp);
12368		SCTP_INP_INCR_REF(inp);
12369		SCTP_INP_WUNLOCK(inp);
12370		/* With the lock applied look again */
12371		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12372		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12373			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12374		}
12375		if (stcb == NULL) {
12376			SCTP_INP_WLOCK(inp);
12377			SCTP_INP_DECR_REF(inp);
12378			SCTP_INP_WUNLOCK(inp);
12379		} else {
12380			hold_tcblock = 1;
12381		}
12382		if (error) {
12383			goto out_unlocked;
12384		}
12385		if (t_inp != inp) {
12386			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12387			error = ENOTCONN;
12388			goto out_unlocked;
12389		}
12390	}
12391	if (stcb == NULL) {
12392		if (addr == NULL) {
12393			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12394			error = ENOENT;
12395			goto out_unlocked;
12396		} else {
12397			/* We must go ahead and start the INIT process */
12398			uint32_t vrf_id;
12399
12400			if ((sinfo_flags & SCTP_ABORT) ||
12401			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12402				/*-
12403				 * User asks to abort a non-existant assoc,
12404				 * or EOF a non-existant assoc with no data
12405				 */
12406				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12407				error = ENOENT;
12408				goto out_unlocked;
12409			}
12410			/* get an asoc/stcb struct */
12411			vrf_id = inp->def_vrf_id;
12412#ifdef INVARIANTS
12413			if (create_lock_applied == 0) {
12414				panic("Error, should hold create lock and I don't?");
12415			}
12416#endif
12417			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12418			    p
12419			    );
12420			if (stcb == NULL) {
12421				/* Error is setup for us in the call */
12422				goto out_unlocked;
12423			}
12424			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12425				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12426				/*
12427				 * Set the connected flag so we can queue
12428				 * data
12429				 */
12430				soisconnecting(so);
12431			}
12432			hold_tcblock = 1;
12433			if (create_lock_applied) {
12434				SCTP_ASOC_CREATE_UNLOCK(inp);
12435				create_lock_applied = 0;
12436			} else {
12437				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12438			}
12439			/*
12440			 * Turn on queue only flag to prevent data from
12441			 * being sent
12442			 */
12443			queue_only = 1;
12444			asoc = &stcb->asoc;
12445			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12446			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12447
12448			/* initialize authentication params for the assoc */
12449			sctp_initialize_auth_params(inp, stcb);
12450
12451			if (control) {
12452				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12453					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12454					    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12455					hold_tcblock = 0;
12456					stcb = NULL;
12457					goto out_unlocked;
12458				}
12459			}
12460			/* out with the INIT */
12461			queue_only_for_init = 1;
12462			/*-
12463			 * we may want to dig in after this call and adjust the MTU
12464			 * value. It defaulted to 1500 (constant) but the ro
12465			 * structure may now have an update and thus we may need to
12466			 * change it BEFORE we append the message.
12467			 */
12468		}
12469	} else
12470		asoc = &stcb->asoc;
12471	if (srcv == NULL)
12472		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12473	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12474		if (addr)
12475			net = sctp_findnet(stcb, addr);
12476		else
12477			net = NULL;
12478		if ((net == NULL) ||
12479		    ((port != 0) && (port != stcb->rport))) {
12480			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12481			error = EINVAL;
12482			goto out_unlocked;
12483		}
12484	} else {
12485		if (stcb->asoc.alternate) {
12486			net = stcb->asoc.alternate;
12487		} else {
12488			net = stcb->asoc.primary_destination;
12489		}
12490	}
12491	atomic_add_int(&stcb->total_sends, 1);
12492	/* Keep the stcb from being freed under our feet */
12493	atomic_add_int(&asoc->refcnt, 1);
12494	free_cnt_applied = 1;
12495
12496	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12497		if (sndlen > asoc->smallest_mtu) {
12498			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12499			error = EMSGSIZE;
12500			goto out_unlocked;
12501		}
12502	}
12503	if (SCTP_SO_IS_NBIO(so)
12504	    || (flags & MSG_NBIO)
12505	    ) {
12506		non_blocking = 1;
12507	}
12508	/* would we block? */
12509	if (non_blocking) {
12510		if (hold_tcblock == 0) {
12511			SCTP_TCB_LOCK(stcb);
12512			hold_tcblock = 1;
12513		}
12514		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12515		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12516		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12517			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12518			if (sndlen > SCTP_SB_LIMIT_SND(so))
12519				error = EMSGSIZE;
12520			else
12521				error = EWOULDBLOCK;
12522			goto out_unlocked;
12523		}
12524		stcb->asoc.sb_send_resv += sndlen;
12525		SCTP_TCB_UNLOCK(stcb);
12526		hold_tcblock = 0;
12527	} else {
12528		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12529	}
12530	local_soresv = sndlen;
12531	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12532		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12533		error = ECONNRESET;
12534		goto out_unlocked;
12535	}
12536	if (create_lock_applied) {
12537		SCTP_ASOC_CREATE_UNLOCK(inp);
12538		create_lock_applied = 0;
12539	}
12540	if (asoc->stream_reset_outstanding) {
12541		/*
12542		 * Can't queue any data while stream reset is underway.
12543		 */
12544		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12545		error = EAGAIN;
12546		goto out_unlocked;
12547	}
12548	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12549	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12550		queue_only = 1;
12551	}
12552	/* we are now done with all control */
12553	if (control) {
12554		sctp_m_freem(control);
12555		control = NULL;
12556	}
12557	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12558	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12559	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12560	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12561		if (srcv->sinfo_flags & SCTP_ABORT) {
12562			;
12563		} else {
12564			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12565			error = ECONNRESET;
12566			goto out_unlocked;
12567		}
12568	}
12569	/* Ok, we will attempt a msgsnd :> */
12570	if (p) {
12571		p->td_ru.ru_msgsnd++;
12572	}
12573	/* Are we aborting? */
12574	if (srcv->sinfo_flags & SCTP_ABORT) {
12575		struct mbuf *mm;
12576		int tot_demand, tot_out = 0, max_out;
12577
12578		SCTP_STAT_INCR(sctps_sends_with_abort);
12579		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12580		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12581			/* It has to be up before we abort */
12582			/* how big is the user initiated abort? */
12583			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12584			error = EINVAL;
12585			goto out;
12586		}
12587		if (hold_tcblock) {
12588			SCTP_TCB_UNLOCK(stcb);
12589			hold_tcblock = 0;
12590		}
12591		if (top) {
12592			struct mbuf *cntm = NULL;
12593
12594			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12595			if (sndlen != 0) {
12596				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12597					tot_out += SCTP_BUF_LEN(cntm);
12598				}
12599			}
12600		} else {
12601			/* Must fit in a MTU */
12602			tot_out = sndlen;
12603			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12604			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12605				/* To big */
12606				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12607				error = EMSGSIZE;
12608				goto out;
12609			}
12610			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12611		}
12612		if (mm == NULL) {
12613			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12614			error = ENOMEM;
12615			goto out;
12616		}
12617		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12618		max_out -= sizeof(struct sctp_abort_msg);
12619		if (tot_out > max_out) {
12620			tot_out = max_out;
12621		}
12622		if (mm) {
12623			struct sctp_paramhdr *ph;
12624
12625			/* now move forward the data pointer */
12626			ph = mtod(mm, struct sctp_paramhdr *);
12627			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12628			ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12629			ph++;
12630			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12631			if (top == NULL) {
12632				error = uiomove((caddr_t)ph, (int)tot_out, uio);
12633				if (error) {
12634					/*-
12635					 * Here if we can't get his data we
12636					 * still abort we just don't get to
12637					 * send the users note :-0
12638					 */
12639					sctp_m_freem(mm);
12640					mm = NULL;
12641				}
12642			} else {
12643				if (sndlen != 0) {
12644					SCTP_BUF_NEXT(mm) = top;
12645				}
12646			}
12647		}
12648		if (hold_tcblock == 0) {
12649			SCTP_TCB_LOCK(stcb);
12650		}
12651		atomic_add_int(&stcb->asoc.refcnt, -1);
12652		free_cnt_applied = 0;
12653		/* release this lock, otherwise we hang on ourselves */
12654		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12655		/* now relock the stcb so everything is sane */
12656		hold_tcblock = 0;
12657		stcb = NULL;
12658		/*
12659		 * In this case top is already chained to mm avoid double
12660		 * free, since we free it below if top != NULL and driver
12661		 * would free it after sending the packet out
12662		 */
12663		if (sndlen != 0) {
12664			top = NULL;
12665		}
12666		goto out_unlocked;
12667	}
12668	/* Calculate the maximum we can send */
12669	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12670	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12671		if (non_blocking) {
12672			/* we already checked for non-blocking above. */
12673			max_len = sndlen;
12674		} else {
12675			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12676		}
12677	} else {
12678		max_len = 0;
12679	}
12680	if (hold_tcblock) {
12681		SCTP_TCB_UNLOCK(stcb);
12682		hold_tcblock = 0;
12683	}
12684	/* Is the stream no. valid? */
12685	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12686		/* Invalid stream number */
12687		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12688		error = EINVAL;
12689		goto out_unlocked;
12690	}
12691	if (asoc->strmout == NULL) {
12692		/* huh? software error */
12693		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12694		error = EFAULT;
12695		goto out_unlocked;
12696	}
12697	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
12698	if ((user_marks_eor == 0) &&
12699	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12700		/* It will NEVER fit */
12701		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12702		error = EMSGSIZE;
12703		goto out_unlocked;
12704	}
12705	if ((uio == NULL) && user_marks_eor) {
12706		/*-
12707		 * We do not support eeor mode for
12708		 * sending with mbuf chains (like sendfile).
12709		 */
12710		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12711		error = EINVAL;
12712		goto out_unlocked;
12713	}
12714	if (user_marks_eor) {
12715		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12716	} else {
12717		/*-
12718		 * For non-eeor the whole message must fit in
12719		 * the socket send buffer.
12720		 */
12721		local_add_more = sndlen;
12722	}
12723	len = 0;
12724	if (non_blocking) {
12725		goto skip_preblock;
12726	}
12727	if (((max_len <= local_add_more) &&
12728	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12729	    (max_len == 0) ||
12730	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12731		/* No room right now ! */
12732		SOCKBUF_LOCK(&so->so_snd);
12733		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12734		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12735		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12736			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12737			    (unsigned int)SCTP_SB_LIMIT_SND(so),
12738			    inqueue_bytes,
12739			    local_add_more,
12740			    stcb->asoc.stream_queue_cnt,
12741			    stcb->asoc.chunks_on_out_queue,
12742			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12743			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12744				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12745			}
12746			be.error = 0;
12747			stcb->block_entry = &be;
12748			error = sbwait(&so->so_snd);
12749			stcb->block_entry = NULL;
12750			if (error || so->so_error || be.error) {
12751				if (error == 0) {
12752					if (so->so_error)
12753						error = so->so_error;
12754					if (be.error) {
12755						error = be.error;
12756					}
12757				}
12758				SOCKBUF_UNLOCK(&so->so_snd);
12759				goto out_unlocked;
12760			}
12761			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12762				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12763				    asoc, stcb->asoc.total_output_queue_size);
12764			}
12765			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12766				goto out_unlocked;
12767			}
12768			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12769		}
12770		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12771			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12772		} else {
12773			max_len = 0;
12774		}
12775		SOCKBUF_UNLOCK(&so->so_snd);
12776	}
12777skip_preblock:
12778	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12779		goto out_unlocked;
12780	}
12781	/*
12782	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12783	 * case NOTE: uio will be null when top/mbuf is passed
12784	 */
12785	if (sndlen == 0) {
12786		if (srcv->sinfo_flags & SCTP_EOF) {
12787			got_all_of_the_send = 1;
12788			goto dataless_eof;
12789		} else {
12790			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12791			error = EINVAL;
12792			goto out;
12793		}
12794	}
12795	if (top == NULL) {
12796		struct sctp_stream_queue_pending *sp;
12797		struct sctp_stream_out *strm;
12798		uint32_t sndout;
12799
12800		SCTP_TCB_SEND_LOCK(stcb);
12801		if ((asoc->stream_locked) &&
12802		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
12803			SCTP_TCB_SEND_UNLOCK(stcb);
12804			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12805			error = EINVAL;
12806			goto out;
12807		}
12808		SCTP_TCB_SEND_UNLOCK(stcb);
12809
12810		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12811		if (strm->last_msg_incomplete == 0) {
12812	do_a_copy_in:
12813			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12814			if ((sp == NULL) || (error)) {
12815				goto out;
12816			}
12817			SCTP_TCB_SEND_LOCK(stcb);
12818			if (sp->msg_is_complete) {
12819				strm->last_msg_incomplete = 0;
12820				asoc->stream_locked = 0;
12821			} else {
12822				/*
12823				 * Just got locked to this guy in case of an
12824				 * interrupt.
12825				 */
12826				strm->last_msg_incomplete = 1;
12827				asoc->stream_locked = 1;
12828				asoc->stream_locked_on = srcv->sinfo_stream;
12829				sp->sender_all_done = 0;
12830			}
12831			sctp_snd_sb_alloc(stcb, sp->length);
12832			atomic_add_int(&asoc->stream_queue_cnt, 1);
12833			if (srcv->sinfo_flags & SCTP_UNORDERED) {
12834				SCTP_STAT_INCR(sctps_sends_with_unord);
12835			}
12836			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12837			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12838			SCTP_TCB_SEND_UNLOCK(stcb);
12839		} else {
12840			SCTP_TCB_SEND_LOCK(stcb);
12841			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12842			SCTP_TCB_SEND_UNLOCK(stcb);
12843			if (sp == NULL) {
12844				/* ???? Huh ??? last msg is gone */
12845#ifdef INVARIANTS
12846				panic("Warning: Last msg marked incomplete, yet nothing left?");
12847#else
12848				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12849				strm->last_msg_incomplete = 0;
12850#endif
12851				goto do_a_copy_in;
12852
12853			}
12854		}
12855		while (uio->uio_resid > 0) {
12856			/* How much room do we have? */
12857			struct mbuf *new_tail, *mm;
12858
12859			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12860				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12861			else
12862				max_len = 0;
12863
12864			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12865			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12866			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12867				sndout = 0;
12868				new_tail = NULL;
12869				if (hold_tcblock) {
12870					SCTP_TCB_UNLOCK(stcb);
12871					hold_tcblock = 0;
12872				}
12873				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12874				if ((mm == NULL) || error) {
12875					if (mm) {
12876						sctp_m_freem(mm);
12877					}
12878					goto out;
12879				}
12880				/* Update the mbuf and count */
12881				SCTP_TCB_SEND_LOCK(stcb);
12882				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12883					/*
12884					 * we need to get out. Peer probably
12885					 * aborted.
12886					 */
12887					sctp_m_freem(mm);
12888					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12889						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12890						error = ECONNRESET;
12891					}
12892					SCTP_TCB_SEND_UNLOCK(stcb);
12893					goto out;
12894				}
12895				if (sp->tail_mbuf) {
12896					/* tack it to the end */
12897					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12898					sp->tail_mbuf = new_tail;
12899				} else {
12900					/* A stolen mbuf */
12901					sp->data = mm;
12902					sp->tail_mbuf = new_tail;
12903				}
12904				sctp_snd_sb_alloc(stcb, sndout);
12905				atomic_add_int(&sp->length, sndout);
12906				len += sndout;
12907
12908				/* Did we reach EOR? */
12909				if ((uio->uio_resid == 0) &&
12910				    ((user_marks_eor == 0) ||
12911				    (srcv->sinfo_flags & SCTP_EOF) ||
12912				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12913					sp->msg_is_complete = 1;
12914				} else {
12915					sp->msg_is_complete = 0;
12916				}
12917				SCTP_TCB_SEND_UNLOCK(stcb);
12918			}
12919			if (uio->uio_resid == 0) {
12920				/* got it all? */
12921				continue;
12922			}
12923			/* PR-SCTP? */
12924			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
12925				/*
12926				 * This is ugly but we must assure locking
12927				 * order
12928				 */
12929				if (hold_tcblock == 0) {
12930					SCTP_TCB_LOCK(stcb);
12931					hold_tcblock = 1;
12932				}
12933				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12934				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12935				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12936					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12937				else
12938					max_len = 0;
12939				if (max_len > 0) {
12940					continue;
12941				}
12942				SCTP_TCB_UNLOCK(stcb);
12943				hold_tcblock = 0;
12944			}
12945			/* wait for space now */
12946			if (non_blocking) {
12947				/* Non-blocking io in place out */
12948				goto skip_out_eof;
12949			}
12950			/* What about the INIT, send it maybe */
12951			if (queue_only_for_init) {
12952				if (hold_tcblock == 0) {
12953					SCTP_TCB_LOCK(stcb);
12954					hold_tcblock = 1;
12955				}
12956				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12957					/* a collision took us forward? */
12958					queue_only = 0;
12959				} else {
12960					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12961					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12962					queue_only = 1;
12963				}
12964			}
12965			if ((net->flight_size > net->cwnd) &&
12966			    (asoc->sctp_cmt_on_off == 0)) {
12967				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12968				queue_only = 1;
12969			} else if (asoc->ifp_had_enobuf) {
12970				SCTP_STAT_INCR(sctps_ifnomemqueued);
12971				if (net->flight_size > (2 * net->mtu)) {
12972					queue_only = 1;
12973				}
12974				asoc->ifp_had_enobuf = 0;
12975			}
12976			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12977			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12978			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12979			    (stcb->asoc.total_flight > 0) &&
12980			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12981			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12982
12983				/*-
12984				 * Ok, Nagle is set on and we have data outstanding.
12985				 * Don't send anything and let SACKs drive out the
12986				 * data unless wen have a "full" segment to send.
12987				 */
12988				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12989					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12990				}
12991				SCTP_STAT_INCR(sctps_naglequeued);
12992				nagle_applies = 1;
12993			} else {
12994				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12995					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12996						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12997				}
12998				SCTP_STAT_INCR(sctps_naglesent);
12999				nagle_applies = 0;
13000			}
13001			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13002
13003				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13004				    nagle_applies, un_sent);
13005				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13006				    stcb->asoc.total_flight,
13007				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13008			}
13009			if (queue_only_for_init)
13010				queue_only_for_init = 0;
13011			if ((queue_only == 0) && (nagle_applies == 0)) {
13012				/*-
13013				 * need to start chunk output
13014				 * before blocking.. note that if
13015				 * a lock is already applied, then
13016				 * the input via the net is happening
13017				 * and I don't need to start output :-D
13018				 */
13019				if (hold_tcblock == 0) {
13020					if (SCTP_TCB_TRYLOCK(stcb)) {
13021						hold_tcblock = 1;
13022						sctp_chunk_output(inp,
13023						    stcb,
13024						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13025					}
13026				} else {
13027					sctp_chunk_output(inp,
13028					    stcb,
13029					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13030				}
13031				if (hold_tcblock == 1) {
13032					SCTP_TCB_UNLOCK(stcb);
13033					hold_tcblock = 0;
13034				}
13035			}
13036			SOCKBUF_LOCK(&so->so_snd);
13037			/*-
13038			 * This is a bit strange, but I think it will
13039			 * work. The total_output_queue_size is locked and
13040			 * protected by the TCB_LOCK, which we just released.
13041			 * There is a race that can occur between releasing it
13042			 * above, and me getting the socket lock, where sacks
13043			 * come in but we have not put the SB_WAIT on the
13044			 * so_snd buffer to get the wakeup. After the LOCK
13045			 * is applied the sack_processing will also need to
13046			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13047			 * once we have the socket buffer lock if we recheck the
13048			 * size we KNOW we will get to sleep safely with the
13049			 * wakeup flag in place.
13050			 */
13051			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13052			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13053				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13054					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13055					    asoc, uio->uio_resid);
13056				}
13057				be.error = 0;
13058				stcb->block_entry = &be;
13059				error = sbwait(&so->so_snd);
13060				stcb->block_entry = NULL;
13061
13062				if (error || so->so_error || be.error) {
13063					if (error == 0) {
13064						if (so->so_error)
13065							error = so->so_error;
13066						if (be.error) {
13067							error = be.error;
13068						}
13069					}
13070					SOCKBUF_UNLOCK(&so->so_snd);
13071					goto out_unlocked;
13072				}
13073				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13074					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13075					    asoc, stcb->asoc.total_output_queue_size);
13076				}
13077			}
13078			SOCKBUF_UNLOCK(&so->so_snd);
13079			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13080				goto out_unlocked;
13081			}
13082		}
13083		SCTP_TCB_SEND_LOCK(stcb);
13084		if (sp) {
13085			if (sp->msg_is_complete == 0) {
13086				strm->last_msg_incomplete = 1;
13087				asoc->stream_locked = 1;
13088				asoc->stream_locked_on = srcv->sinfo_stream;
13089			} else {
13090				sp->sender_all_done = 1;
13091				strm->last_msg_incomplete = 0;
13092				asoc->stream_locked = 0;
13093			}
13094		} else {
13095			SCTP_PRINTF("Huh no sp TSNH?\n");
13096			strm->last_msg_incomplete = 0;
13097			asoc->stream_locked = 0;
13098		}
13099		SCTP_TCB_SEND_UNLOCK(stcb);
13100		if (uio->uio_resid == 0) {
13101			got_all_of_the_send = 1;
13102		}
13103	} else {
13104		/* We send in a 0, since we do NOT have any locks */
13105		error = sctp_msg_append(stcb, net, top, srcv, 0);
13106		top = NULL;
13107		if (srcv->sinfo_flags & SCTP_EOF) {
13108			/*
13109			 * This should only happen for Panda for the mbuf
13110			 * send case, which does NOT yet support EEOR mode.
13111			 * Thus, we can just set this flag to do the proper
13112			 * EOF handling.
13113			 */
13114			got_all_of_the_send = 1;
13115		}
13116	}
13117	if (error) {
13118		goto out;
13119	}
13120dataless_eof:
13121	/* EOF thing ? */
13122	if ((srcv->sinfo_flags & SCTP_EOF) &&
13123	    (got_all_of_the_send == 1)) {
13124		int cnt;
13125
13126		SCTP_STAT_INCR(sctps_sends_with_eof);
13127		error = 0;
13128		if (hold_tcblock == 0) {
13129			SCTP_TCB_LOCK(stcb);
13130			hold_tcblock = 1;
13131		}
13132		cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13133		if (TAILQ_EMPTY(&asoc->send_queue) &&
13134		    TAILQ_EMPTY(&asoc->sent_queue) &&
13135		    (cnt == 0)) {
13136			if (asoc->locked_on_sending) {
13137				goto abort_anyway;
13138			}
13139			/* there is nothing queued to send, so I'm done... */
13140			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13141			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13142			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13143				struct sctp_nets *netp;
13144
13145				/* only send SHUTDOWN the first time through */
13146				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13147					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13148				}
13149				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13150				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13151				sctp_stop_timers_for_shutdown(stcb);
13152				if (stcb->asoc.alternate) {
13153					netp = stcb->asoc.alternate;
13154				} else {
13155					netp = stcb->asoc.primary_destination;
13156				}
13157				sctp_send_shutdown(stcb, netp);
13158				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13159				    netp);
13160				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13161				    asoc->primary_destination);
13162			}
13163		} else {
13164			/*-
13165			 * we still got (or just got) data to send, so set
13166			 * SHUTDOWN_PENDING
13167			 */
13168			/*-
13169			 * XXX sockets draft says that SCTP_EOF should be
13170			 * sent with no data.  currently, we will allow user
13171			 * data to be sent first and move to
13172			 * SHUTDOWN-PENDING
13173			 */
13174			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13175			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13176			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13177				if (hold_tcblock == 0) {
13178					SCTP_TCB_LOCK(stcb);
13179					hold_tcblock = 1;
13180				}
13181				if (asoc->locked_on_sending) {
13182					/* Locked to send out the data */
13183					struct sctp_stream_queue_pending *sp;
13184
13185					sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13186					if (sp) {
13187						if ((sp->length == 0) && (sp->msg_is_complete == 0))
13188							asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13189					}
13190				}
13191				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13192				if (TAILQ_EMPTY(&asoc->send_queue) &&
13193				    TAILQ_EMPTY(&asoc->sent_queue) &&
13194				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13195			abort_anyway:
13196					if (free_cnt_applied) {
13197						atomic_add_int(&stcb->asoc.refcnt, -1);
13198						free_cnt_applied = 0;
13199					}
13200					sctp_abort_an_association(stcb->sctp_ep, stcb,
13201					    NULL, SCTP_SO_LOCKED);
13202					/*
13203					 * now relock the stcb so everything
13204					 * is sane
13205					 */
13206					hold_tcblock = 0;
13207					stcb = NULL;
13208					goto out;
13209				}
13210				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13211				    asoc->primary_destination);
13212				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13213			}
13214		}
13215	}
13216skip_out_eof:
13217	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13218		some_on_control = 1;
13219	}
13220	if (queue_only_for_init) {
13221		if (hold_tcblock == 0) {
13222			SCTP_TCB_LOCK(stcb);
13223			hold_tcblock = 1;
13224		}
13225		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13226			/* a collision took us forward? */
13227			queue_only = 0;
13228		} else {
13229			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13230			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13231			queue_only = 1;
13232		}
13233	}
13234	if ((net->flight_size > net->cwnd) &&
13235	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13236		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13237		queue_only = 1;
13238	} else if (asoc->ifp_had_enobuf) {
13239		SCTP_STAT_INCR(sctps_ifnomemqueued);
13240		if (net->flight_size > (2 * net->mtu)) {
13241			queue_only = 1;
13242		}
13243		asoc->ifp_had_enobuf = 0;
13244	}
13245	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13246	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13247	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13248	    (stcb->asoc.total_flight > 0) &&
13249	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13250	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13251		/*-
13252		 * Ok, Nagle is set on and we have data outstanding.
13253		 * Don't send anything and let SACKs drive out the
13254		 * data unless wen have a "full" segment to send.
13255		 */
13256		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13257			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13258		}
13259		SCTP_STAT_INCR(sctps_naglequeued);
13260		nagle_applies = 1;
13261	} else {
13262		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13263			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13264				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13265		}
13266		SCTP_STAT_INCR(sctps_naglesent);
13267		nagle_applies = 0;
13268	}
13269	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13270		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13271		    nagle_applies, un_sent);
13272		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13273		    stcb->asoc.total_flight,
13274		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13275	}
13276	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13277		/* we can attempt to send too. */
13278		if (hold_tcblock == 0) {
13279			/*
13280			 * If there is activity recv'ing sacks no need to
13281			 * send
13282			 */
13283			if (SCTP_TCB_TRYLOCK(stcb)) {
13284				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13285				hold_tcblock = 1;
13286			}
13287		} else {
13288			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13289		}
13290	} else if ((queue_only == 0) &&
13291		    (stcb->asoc.peers_rwnd == 0) &&
13292	    (stcb->asoc.total_flight == 0)) {
13293		/* We get to have a probe outstanding */
13294		if (hold_tcblock == 0) {
13295			hold_tcblock = 1;
13296			SCTP_TCB_LOCK(stcb);
13297		}
13298		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13299	} else if (some_on_control) {
13300		int num_out, reason, frag_point;
13301
13302		/* Here we do control only */
13303		if (hold_tcblock == 0) {
13304			hold_tcblock = 1;
13305			SCTP_TCB_LOCK(stcb);
13306		}
13307		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13308		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13309		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13310	}
13311	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13312	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13313	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13314	    stcb->asoc.total_output_queue_size, error);
13315
13316out:
13317out_unlocked:
13318
13319	if (local_soresv && stcb) {
13320		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13321	}
13322	if (create_lock_applied) {
13323		SCTP_ASOC_CREATE_UNLOCK(inp);
13324	}
13325	if ((stcb) && hold_tcblock) {
13326		SCTP_TCB_UNLOCK(stcb);
13327	}
13328	if (stcb && free_cnt_applied) {
13329		atomic_add_int(&stcb->asoc.refcnt, -1);
13330	}
13331#ifdef INVARIANTS
13332	if (stcb) {
13333		if (mtx_owned(&stcb->tcb_mtx)) {
13334			panic("Leaving with tcb mtx owned?");
13335		}
13336		if (mtx_owned(&stcb->tcb_send_mtx)) {
13337			panic("Leaving with tcb send mtx owned?");
13338		}
13339	}
13340#endif
13341#ifdef INVARIANTS
13342	if (inp) {
13343		sctp_validate_no_locks(inp);
13344	} else {
13345		SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13346	}
13347#endif
13348	if (top) {
13349		sctp_m_freem(top);
13350	}
13351	if (control) {
13352		sctp_m_freem(control);
13353	}
13354	return (error);
13355}
13356
13357
13358/*
13359 * generate an AUTHentication chunk, if required
13360 */
13361struct mbuf *
13362sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13363    struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13364    struct sctp_tcb *stcb, uint8_t chunk)
13365{
13366	struct mbuf *m_auth;
13367	struct sctp_auth_chunk *auth;
13368	int chunk_len;
13369	struct mbuf *cn;
13370
13371	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13372	    (stcb == NULL))
13373		return (m);
13374
13375	if (stcb->asoc.auth_supported == 0) {
13376		return (m);
13377	}
13378	/* does the requested chunk require auth? */
13379	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13380		return (m);
13381	}
13382	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13383	if (m_auth == NULL) {
13384		/* no mbuf's */
13385		return (m);
13386	}
13387	/* reserve some space if this will be the first mbuf */
13388	if (m == NULL)
13389		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13390	/* fill in the AUTH chunk details */
13391	auth = mtod(m_auth, struct sctp_auth_chunk *);
13392	bzero(auth, sizeof(*auth));
13393	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13394	auth->ch.chunk_flags = 0;
13395	chunk_len = sizeof(*auth) +
13396	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13397	auth->ch.chunk_length = htons(chunk_len);
13398	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13399	/* key id and hmac digest will be computed and filled in upon send */
13400
13401	/* save the offset where the auth was inserted into the chain */
13402	*offset = 0;
13403	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13404		*offset += SCTP_BUF_LEN(cn);
13405	}
13406
13407	/* update length and return pointer to the auth chunk */
13408	SCTP_BUF_LEN(m_auth) = chunk_len;
13409	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13410	if (auth_ret != NULL)
13411		*auth_ret = auth;
13412
13413	return (m);
13414}
13415
13416#ifdef INET6
13417int
13418sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13419{
13420	struct nd_prefix *pfx = NULL;
13421	struct nd_pfxrouter *pfxrtr = NULL;
13422	struct sockaddr_in6 gw6;
13423
13424	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13425		return (0);
13426
13427	/* get prefix entry of address */
13428	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13429		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13430			continue;
13431		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13432		    &src6->sin6_addr, &pfx->ndpr_mask))
13433			break;
13434	}
13435	/* no prefix entry in the prefix list */
13436	if (pfx == NULL) {
13437		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13438		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13439		return (0);
13440	}
13441	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13442	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13443
13444	/* search installed gateway from prefix entry */
13445	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13446		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13447		gw6.sin6_family = AF_INET6;
13448		gw6.sin6_len = sizeof(struct sockaddr_in6);
13449		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13450		    sizeof(struct in6_addr));
13451		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13452		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13453		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13454		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13455		if (sctp_cmpaddr((struct sockaddr *)&gw6,
13456		    ro->ro_rt->rt_gateway)) {
13457			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13458			return (1);
13459		}
13460	}
13461	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13462	return (0);
13463}
13464
13465#endif
13466
13467int
13468sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13469{
13470#ifdef INET
13471	struct sockaddr_in *sin, *mask;
13472	struct ifaddr *ifa;
13473	struct in_addr srcnetaddr, gwnetaddr;
13474
13475	if (ro == NULL || ro->ro_rt == NULL ||
13476	    sifa->address.sa.sa_family != AF_INET) {
13477		return (0);
13478	}
13479	ifa = (struct ifaddr *)sifa->ifa;
13480	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13481	sin = &sifa->address.sin;
13482	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13483	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13484	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13485	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13486
13487	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13488	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13489	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13490	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13491	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13492	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13493		return (1);
13494	}
13495#endif
13496	return (0);
13497}
13498