sctp_output.c revision 273002 
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 273002 2014-10-12 17:45:22Z 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		} else {
3164			SCTP_PRINTF("Stcb is null - no print\n");
3165		}
3166		atomic_add_int(&sifa->refcount, 1);
3167		goto out;
3168	}
3169plan_d:
3170	/*
3171	 * plan_d: We are in trouble. No preferred address on the emit
3172	 * interface. And not even a preferred address on all interfaces. Go
3173	 * out and see if we can find an acceptable address somewhere
3174	 * amongst all interfaces.
3175	 */
3176	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179			/* wrong base scope */
3180			continue;
3181		}
3182		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183#ifdef INET
3184			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3187				continue;
3188			}
3189#endif
3190#ifdef INET6
3191			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194				continue;
3195			}
3196#endif
3197			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198			    (non_asoc_addr_ok == 0))
3199				continue;
3200			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201			    dest_is_loop,
3202			    dest_is_priv, fam);
3203			if (sifa == NULL)
3204				continue;
3205			if (stcb) {
3206				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207					sifa = NULL;
3208					continue;
3209				}
3210				if (((non_asoc_addr_ok == 0) &&
3211				    (sctp_is_addr_restricted(stcb, sifa))) ||
3212				    (non_asoc_addr_ok &&
3213				    (sctp_is_addr_restricted(stcb, sifa)) &&
3214				    (!sctp_is_addr_pending(stcb, sifa)))) {
3215					/*
3216					 * It is restricted for some
3217					 * reason.. probably not yet added.
3218					 */
3219					sifa = NULL;
3220					continue;
3221				}
3222			}
3223			goto out;
3224		}
3225	}
3226#ifdef INET
3227	if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3228		stcb->asoc.scope.ipv4_local_scope = 1;
3229		retried = 1;
3230		goto again_with_private_addresses_allowed;
3231	} else if (retried == 1) {
3232		stcb->asoc.scope.ipv4_local_scope = 0;
3233	}
3234#endif
3235out:
3236#ifdef INET
3237	if (sifa) {
3238		if (retried == 1) {
3239			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3240				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3241					/* wrong base scope */
3242					continue;
3243				}
3244				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3245					struct sctp_ifa *tmp_sifa;
3246
3247#ifdef INET
3248					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3249					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3250					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3251						continue;
3252					}
3253#endif
3254#ifdef INET6
3255					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3256					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3257					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3258						continue;
3259					}
3260#endif
3261					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3262					    (non_asoc_addr_ok == 0))
3263						continue;
3264					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3265					    dest_is_loop,
3266					    dest_is_priv, fam);
3267					if (tmp_sifa == NULL) {
3268						continue;
3269					}
3270					if (tmp_sifa == sifa) {
3271						continue;
3272					}
3273					if (stcb) {
3274						if (sctp_is_address_in_scope(tmp_sifa,
3275						    &stcb->asoc.scope, 0) == 0) {
3276							continue;
3277						}
3278						if (((non_asoc_addr_ok == 0) &&
3279						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3280						    (non_asoc_addr_ok &&
3281						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3282						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3283							/*
3284							 * It is restricted
3285							 * for some reason..
3286							 * probably not yet
3287							 * added.
3288							 */
3289							continue;
3290						}
3291					}
3292					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3293					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3294						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3295					}
3296				}
3297			}
3298		}
3299		atomic_add_int(&sifa->refcount, 1);
3300	}
3301#endif
3302	return (sifa);
3303}
3304
3305
3306
3307/* tcb may be NULL */
3308struct sctp_ifa *
3309sctp_source_address_selection(struct sctp_inpcb *inp,
3310    struct sctp_tcb *stcb,
3311    sctp_route_t * ro,
3312    struct sctp_nets *net,
3313    int non_asoc_addr_ok, uint32_t vrf_id)
3314{
3315	struct sctp_ifa *answer;
3316	uint8_t dest_is_priv, dest_is_loop;
3317	sa_family_t fam;
3318
3319#ifdef INET
3320	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321
3322#endif
3323#ifdef INET6
3324	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325
3326#endif
3327
3328	/**
3329	 * Rules: - Find the route if needed, cache if I can. - Look at
3330	 * interface address in route, Is it in the bound list. If so we
3331	 * have the best source. - If not we must rotate amongst the
3332	 * addresses.
3333	 *
3334	 * Cavets and issues
3335	 *
3336	 * Do we need to pay attention to scope. We can have a private address
3337	 * or a global address we are sourcing or sending to. So if we draw
3338	 * it out
3339	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340	 * For V4
3341	 * ------------------------------------------
3342	 *      source     *      dest  *  result
3343	 * -----------------------------------------
3344	 * <a>  Private    *    Global  *  NAT
3345	 * -----------------------------------------
3346	 * <b>  Private    *    Private *  No problem
3347	 * -----------------------------------------
3348	 * <c>  Global     *    Private *  Huh, How will this work?
3349	 * -----------------------------------------
3350	 * <d>  Global     *    Global  *  No Problem
3351	 *------------------------------------------
3352	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353	 * For V6
3354	 *------------------------------------------
3355	 *      source     *      dest  *  result
3356	 * -----------------------------------------
3357	 * <a>  Linklocal  *    Global  *
3358	 * -----------------------------------------
3359	 * <b>  Linklocal  * Linklocal  *  No problem
3360	 * -----------------------------------------
3361	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3362	 * -----------------------------------------
3363	 * <d>  Global     *    Global  *  No Problem
3364	 *------------------------------------------
3365	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366	 *
3367	 * And then we add to that what happens if there are multiple addresses
3368	 * assigned to an interface. Remember the ifa on a ifn is a linked
3369	 * list of addresses. So one interface can have more than one IP
3370	 * address. What happens if we have both a private and a global
3371	 * address? Do we then use context of destination to sort out which
3372	 * one is best? And what about NAT's sending P->G may get you a NAT
3373	 * translation, or should you select the G thats on the interface in
3374	 * preference.
3375	 *
3376	 * Decisions:
3377	 *
3378	 * - count the number of addresses on the interface.
3379	 * - if it is one, no problem except case <c>.
3380	 *   For <a> we will assume a NAT out there.
3381	 * - if there are more than one, then we need to worry about scope P
3382	 *   or G. We should prefer G -> G and P -> P if possible.
3383	 *   Then as a secondary fall back to mixed types G->P being a last
3384	 *   ditch one.
3385	 * - The above all works for bound all, but bound specific we need to
3386	 *   use the same concept but instead only consider the bound
3387	 *   addresses. If the bound set is NOT assigned to the interface then
3388	 *   we must use rotation amongst the bound addresses..
3389	 */
3390	if (ro->ro_rt == NULL) {
3391		/*
3392		 * Need a route to cache.
3393		 */
3394		SCTP_RTALLOC(ro, vrf_id);
3395	}
3396	if (ro->ro_rt == NULL) {
3397		return (NULL);
3398	}
3399	fam = ro->ro_dst.sa_family;
3400	dest_is_priv = dest_is_loop = 0;
3401	/* Setup our scopes for the destination */
3402	switch (fam) {
3403#ifdef INET
3404	case AF_INET:
3405		/* Scope based on outbound address */
3406		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407			dest_is_loop = 1;
3408			if (net != NULL) {
3409				/* mark it as local */
3410				net->addr_is_local = 1;
3411			}
3412		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413			dest_is_priv = 1;
3414		}
3415		break;
3416#endif
3417#ifdef INET6
3418	case AF_INET6:
3419		/* Scope based on outbound address */
3420		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422			/*
3423			 * If the address is a loopback address, which
3424			 * consists of "::1" OR "fe80::1%lo0", we are
3425			 * loopback scope. But we don't use dest_is_priv
3426			 * (link local addresses).
3427			 */
3428			dest_is_loop = 1;
3429			if (net != NULL) {
3430				/* mark it as local */
3431				net->addr_is_local = 1;
3432			}
3433		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434			dest_is_priv = 1;
3435		}
3436		break;
3437#endif
3438	}
3439	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441	SCTP_IPI_ADDR_RLOCK();
3442	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443		/*
3444		 * Bound all case
3445		 */
3446		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447		    dest_is_priv, dest_is_loop,
3448		    non_asoc_addr_ok, fam);
3449		SCTP_IPI_ADDR_RUNLOCK();
3450		return (answer);
3451	}
3452	/*
3453	 * Subset bound case
3454	 */
3455	if (stcb) {
3456		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457		    vrf_id, dest_is_priv,
3458		    dest_is_loop,
3459		    non_asoc_addr_ok, fam);
3460	} else {
3461		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462		    non_asoc_addr_ok,
3463		    dest_is_priv,
3464		    dest_is_loop, fam);
3465	}
3466	SCTP_IPI_ADDR_RUNLOCK();
3467	return (answer);
3468}
3469
3470static int
3471sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472{
3473	struct cmsghdr cmh;
3474	int tlen, at, found;
3475	struct sctp_sndinfo sndinfo;
3476	struct sctp_prinfo prinfo;
3477	struct sctp_authinfo authinfo;
3478
3479	tlen = SCTP_BUF_LEN(control);
3480	at = 0;
3481	found = 0;
3482	/*
3483	 * Independent of how many mbufs, find the c_type inside the control
3484	 * structure and copy out the data.
3485	 */
3486	while (at < tlen) {
3487		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3488			/* There is not enough room for one more. */
3489			return (found);
3490		}
3491		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3492		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3493			/* We dont't have a complete CMSG header. */
3494			return (found);
3495		}
3496		if (((int)cmh.cmsg_len + at) > tlen) {
3497			/* We don't have the complete CMSG. */
3498			return (found);
3499		}
3500		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3501		    ((c_type == cmh.cmsg_type) ||
3502		    ((c_type == SCTP_SNDRCV) &&
3503		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3504		    (cmh.cmsg_type == SCTP_PRINFO) ||
3505		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3506			if (c_type == cmh.cmsg_type) {
3507				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3508					return (found);
3509				}
3510				/* It is exactly what we want. Copy it out. */
3511				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3512				return (1);
3513			} else {
3514				struct sctp_sndrcvinfo *sndrcvinfo;
3515
3516				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3517				if (found == 0) {
3518					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3519						return (found);
3520					}
3521					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3522				}
3523				switch (cmh.cmsg_type) {
3524				case SCTP_SNDINFO:
3525					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3526						return (found);
3527					}
3528					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3529					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3530					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3531					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3532					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3533					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3534					break;
3535				case SCTP_PRINFO:
3536					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3537						return (found);
3538					}
3539					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3540					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3541						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3542					} else {
3543						sndrcvinfo->sinfo_timetolive = 0;
3544					}
3545					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3546					break;
3547				case SCTP_AUTHINFO:
3548					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3549						return (found);
3550					}
3551					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3552					sndrcvinfo->sinfo_keynumber_valid = 1;
3553					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3554					break;
3555				default:
3556					return (found);
3557				}
3558				found = 1;
3559			}
3560		}
3561		at += CMSG_ALIGN(cmh.cmsg_len);
3562	}
3563	return (found);
3564}
3565
3566static int
3567sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3568{
3569	struct cmsghdr cmh;
3570	int tlen, at;
3571	struct sctp_initmsg initmsg;
3572
3573#ifdef INET
3574	struct sockaddr_in sin;
3575
3576#endif
3577#ifdef INET6
3578	struct sockaddr_in6 sin6;
3579
3580#endif
3581
3582	tlen = SCTP_BUF_LEN(control);
3583	at = 0;
3584	while (at < tlen) {
3585		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3586			/* There is not enough room for one more. */
3587			*error = EINVAL;
3588			return (1);
3589		}
3590		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3591		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3592			/* We dont't have a complete CMSG header. */
3593			*error = EINVAL;
3594			return (1);
3595		}
3596		if (((int)cmh.cmsg_len + at) > tlen) {
3597			/* We don't have the complete CMSG. */
3598			*error = EINVAL;
3599			return (1);
3600		}
3601		if (cmh.cmsg_level == IPPROTO_SCTP) {
3602			switch (cmh.cmsg_type) {
3603			case SCTP_INIT:
3604				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3605					*error = EINVAL;
3606					return (1);
3607				}
3608				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3609				if (initmsg.sinit_max_attempts)
3610					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3611				if (initmsg.sinit_num_ostreams)
3612					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3613				if (initmsg.sinit_max_instreams)
3614					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3615				if (initmsg.sinit_max_init_timeo)
3616					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3617				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3618					struct sctp_stream_out *tmp_str;
3619					unsigned int i;
3620
3621#if defined(SCTP_DETAILED_STR_STATS)
3622					int j;
3623
3624#endif
3625
3626					/* Default is NOT correct */
3627					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3628					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3629					SCTP_TCB_UNLOCK(stcb);
3630					SCTP_MALLOC(tmp_str,
3631					    struct sctp_stream_out *,
3632					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3633					    SCTP_M_STRMO);
3634					SCTP_TCB_LOCK(stcb);
3635					if (tmp_str != NULL) {
3636						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3637						stcb->asoc.strmout = tmp_str;
3638						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3639					} else {
3640						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3641					}
3642					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3643						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3644						stcb->asoc.strmout[i].chunks_on_queues = 0;
3645						stcb->asoc.strmout[i].next_sequence_send = 0;
3646#if defined(SCTP_DETAILED_STR_STATS)
3647						for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3648							stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3649							stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3650						}
3651#else
3652						stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3653						stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3654#endif
3655						stcb->asoc.strmout[i].stream_no = i;
3656						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3657						stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3658					}
3659				}
3660				break;
3661#ifdef INET
3662			case SCTP_DSTADDRV4:
3663				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3664					*error = EINVAL;
3665					return (1);
3666				}
3667				memset(&sin, 0, sizeof(struct sockaddr_in));
3668				sin.sin_family = AF_INET;
3669				sin.sin_len = sizeof(struct sockaddr_in);
3670				sin.sin_port = stcb->rport;
3671				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3672				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3673				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3674				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3675					*error = EINVAL;
3676					return (1);
3677				}
3678				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3679				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3680					*error = ENOBUFS;
3681					return (1);
3682				}
3683				break;
3684#endif
3685#ifdef INET6
3686			case SCTP_DSTADDRV6:
3687				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3688					*error = EINVAL;
3689					return (1);
3690				}
3691				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3692				sin6.sin6_family = AF_INET6;
3693				sin6.sin6_len = sizeof(struct sockaddr_in6);
3694				sin6.sin6_port = stcb->rport;
3695				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3696				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3697				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3698					*error = EINVAL;
3699					return (1);
3700				}
3701#ifdef INET
3702				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3703					in6_sin6_2_sin(&sin, &sin6);
3704					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3705					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3706					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3707						*error = EINVAL;
3708						return (1);
3709					}
3710					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3711					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3712						*error = ENOBUFS;
3713						return (1);
3714					}
3715				} else
3716#endif
3717					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3718				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3719					*error = ENOBUFS;
3720					return (1);
3721				}
3722				break;
3723#endif
3724			default:
3725				break;
3726			}
3727		}
3728		at += CMSG_ALIGN(cmh.cmsg_len);
3729	}
3730	return (0);
3731}
3732
3733static struct sctp_tcb *
3734sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3735    uint16_t port,
3736    struct mbuf *control,
3737    struct sctp_nets **net_p,
3738    int *error)
3739{
3740	struct cmsghdr cmh;
3741	int tlen, at;
3742	struct sctp_tcb *stcb;
3743	struct sockaddr *addr;
3744
3745#ifdef INET
3746	struct sockaddr_in sin;
3747
3748#endif
3749#ifdef INET6
3750	struct sockaddr_in6 sin6;
3751
3752#endif
3753
3754	tlen = SCTP_BUF_LEN(control);
3755	at = 0;
3756	while (at < tlen) {
3757		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3758			/* There is not enough room for one more. */
3759			*error = EINVAL;
3760			return (NULL);
3761		}
3762		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3763		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3764			/* We dont't have a complete CMSG header. */
3765			*error = EINVAL;
3766			return (NULL);
3767		}
3768		if (((int)cmh.cmsg_len + at) > tlen) {
3769			/* We don't have the complete CMSG. */
3770			*error = EINVAL;
3771			return (NULL);
3772		}
3773		if (cmh.cmsg_level == IPPROTO_SCTP) {
3774			switch (cmh.cmsg_type) {
3775#ifdef INET
3776			case SCTP_DSTADDRV4:
3777				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3778					*error = EINVAL;
3779					return (NULL);
3780				}
3781				memset(&sin, 0, sizeof(struct sockaddr_in));
3782				sin.sin_family = AF_INET;
3783				sin.sin_len = sizeof(struct sockaddr_in);
3784				sin.sin_port = port;
3785				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3786				addr = (struct sockaddr *)&sin;
3787				break;
3788#endif
3789#ifdef INET6
3790			case SCTP_DSTADDRV6:
3791				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3792					*error = EINVAL;
3793					return (NULL);
3794				}
3795				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3796				sin6.sin6_family = AF_INET6;
3797				sin6.sin6_len = sizeof(struct sockaddr_in6);
3798				sin6.sin6_port = port;
3799				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3800#ifdef INET
3801				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3802					in6_sin6_2_sin(&sin, &sin6);
3803					addr = (struct sockaddr *)&sin;
3804				} else
3805#endif
3806					addr = (struct sockaddr *)&sin6;
3807				break;
3808#endif
3809			default:
3810				addr = NULL;
3811				break;
3812			}
3813			if (addr) {
3814				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3815				if (stcb != NULL) {
3816					return (stcb);
3817				}
3818			}
3819		}
3820		at += CMSG_ALIGN(cmh.cmsg_len);
3821	}
3822	return (NULL);
3823}
3824
3825static struct mbuf *
3826sctp_add_cookie(struct mbuf *init, int init_offset,
3827    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3828{
3829	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3830	struct sctp_state_cookie *stc;
3831	struct sctp_paramhdr *ph;
3832	uint8_t *foo;
3833	int sig_offset;
3834	uint16_t cookie_sz;
3835
3836	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3837	    sizeof(struct sctp_paramhdr)), 0,
3838	    M_NOWAIT, 1, MT_DATA);
3839	if (mret == NULL) {
3840		return (NULL);
3841	}
3842	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3843	if (copy_init == NULL) {
3844		sctp_m_freem(mret);
3845		return (NULL);
3846	}
3847#ifdef SCTP_MBUF_LOGGING
3848	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849		struct mbuf *mat;
3850
3851		for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3852			if (SCTP_BUF_IS_EXTENDED(mat)) {
3853				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3854			}
3855		}
3856	}
3857#endif
3858	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3859	    M_NOWAIT);
3860	if (copy_initack == NULL) {
3861		sctp_m_freem(mret);
3862		sctp_m_freem(copy_init);
3863		return (NULL);
3864	}
3865#ifdef SCTP_MBUF_LOGGING
3866	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3867		struct mbuf *mat;
3868
3869		for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3870			if (SCTP_BUF_IS_EXTENDED(mat)) {
3871				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3872			}
3873		}
3874	}
3875#endif
3876	/* easy side we just drop it on the end */
3877	ph = mtod(mret, struct sctp_paramhdr *);
3878	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3879	    sizeof(struct sctp_paramhdr);
3880	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3881	    sizeof(struct sctp_paramhdr));
3882	ph->param_type = htons(SCTP_STATE_COOKIE);
3883	ph->param_length = 0;	/* fill in at the end */
3884	/* Fill in the stc cookie data */
3885	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3886
3887	/* tack the INIT and then the INIT-ACK onto the chain */
3888	cookie_sz = 0;
3889	for (m_at = mret; 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			SCTP_BUF_NEXT(m_at) = copy_init;
3893			break;
3894		}
3895	}
3896	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3897		cookie_sz += SCTP_BUF_LEN(m_at);
3898		if (SCTP_BUF_NEXT(m_at) == NULL) {
3899			SCTP_BUF_NEXT(m_at) = copy_initack;
3900			break;
3901		}
3902	}
3903	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3904		cookie_sz += SCTP_BUF_LEN(m_at);
3905		if (SCTP_BUF_NEXT(m_at) == NULL) {
3906			break;
3907		}
3908	}
3909	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3910	if (sig == NULL) {
3911		/* no space, so free the entire chain */
3912		sctp_m_freem(mret);
3913		return (NULL);
3914	}
3915	SCTP_BUF_LEN(sig) = 0;
3916	SCTP_BUF_NEXT(m_at) = sig;
3917	sig_offset = 0;
3918	foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3919	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3920	*signature = foo;
3921	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3922	cookie_sz += SCTP_SIGNATURE_SIZE;
3923	ph->param_length = htons(cookie_sz);
3924	return (mret);
3925}
3926
3927
3928static uint8_t
3929sctp_get_ect(struct sctp_tcb *stcb)
3930{
3931	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3932		return (SCTP_ECT0_BIT);
3933	} else {
3934		return (0);
3935	}
3936}
3937
3938#if defined(INET) || defined(INET6)
3939static void
3940sctp_handle_no_route(struct sctp_tcb *stcb,
3941    struct sctp_nets *net,
3942    int so_locked)
3943{
3944	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3945
3946	if (net) {
3947		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3948		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3949		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3950			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3951				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3952				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3953				    stcb, 0,
3954				    (void *)net,
3955				    so_locked);
3956				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3957				net->dest_state &= ~SCTP_ADDR_PF;
3958			}
3959		}
3960		if (stcb) {
3961			if (net == stcb->asoc.primary_destination) {
3962				/* need a new primary */
3963				struct sctp_nets *alt;
3964
3965				alt = sctp_find_alternate_net(stcb, net, 0);
3966				if (alt != net) {
3967					if (stcb->asoc.alternate) {
3968						sctp_free_remote_addr(stcb->asoc.alternate);
3969					}
3970					stcb->asoc.alternate = alt;
3971					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3972					if (net->ro._s_addr) {
3973						sctp_free_ifa(net->ro._s_addr);
3974						net->ro._s_addr = NULL;
3975					}
3976					net->src_addr_selected = 0;
3977				}
3978			}
3979		}
3980	}
3981}
3982
3983#endif
3984
3985static int
3986sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3987    struct sctp_tcb *stcb,	/* may be NULL */
3988    struct sctp_nets *net,
3989    struct sockaddr *to,
3990    struct mbuf *m,
3991    uint32_t auth_offset,
3992    struct sctp_auth_chunk *auth,
3993    uint16_t auth_keyid,
3994    int nofragment_flag,
3995    int ecn_ok,
3996    int out_of_asoc_ok,
3997    uint16_t src_port,
3998    uint16_t dest_port,
3999    uint32_t v_tag,
4000    uint16_t port,
4001    union sctp_sockstore *over_addr,
4002    uint8_t use_mflowid, uint32_t mflowid,
4003#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4004    int so_locked SCTP_UNUSED
4005#else
4006    int so_locked
4007#endif
4008)
4009/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4010{
4011	/**
4012	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4013	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4014	 * - fill in the HMAC digest of any AUTH chunk in the packet.
4015	 * - calculate and fill in the SCTP checksum.
4016	 * - prepend an IP address header.
4017	 * - if boundall use INADDR_ANY.
4018	 * - if boundspecific do source address selection.
4019	 * - set fragmentation option for ipV4.
4020	 * - On return from IP output, check/adjust mtu size of output
4021	 *   interface and smallest_mtu size as well.
4022	 */
4023	/* Will need ifdefs around this */
4024	struct mbuf *newm;
4025	struct sctphdr *sctphdr;
4026	int packet_length;
4027	int ret;
4028
4029#if defined(INET) || defined(INET6)
4030	uint32_t vrf_id;
4031
4032#endif
4033#if defined(INET) || defined(INET6)
4034	struct mbuf *o_pak;
4035	sctp_route_t *ro = NULL;
4036	struct udphdr *udp = NULL;
4037
4038#endif
4039	uint8_t tos_value;
4040
4041#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4042	struct socket *so = NULL;
4043
4044#endif
4045
4046	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4047		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4048		sctp_m_freem(m);
4049		return (EFAULT);
4050	}
4051#if defined(INET) || defined(INET6)
4052	if (stcb) {
4053		vrf_id = stcb->asoc.vrf_id;
4054	} else {
4055		vrf_id = inp->def_vrf_id;
4056	}
4057#endif
4058	/* fill in the HMAC digest for any AUTH chunk in the packet */
4059	if ((auth != NULL) && (stcb != NULL)) {
4060		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4061	}
4062	if (net) {
4063		tos_value = net->dscp;
4064	} else if (stcb) {
4065		tos_value = stcb->asoc.default_dscp;
4066	} else {
4067		tos_value = inp->sctp_ep.default_dscp;
4068	}
4069
4070	switch (to->sa_family) {
4071#ifdef INET
4072	case AF_INET:
4073		{
4074			struct ip *ip = NULL;
4075			sctp_route_t iproute;
4076			int len;
4077
4078			len = sizeof(struct ip) + sizeof(struct sctphdr);
4079			if (port) {
4080				len += sizeof(struct udphdr);
4081			}
4082			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4083			if (newm == NULL) {
4084				sctp_m_freem(m);
4085				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4086				return (ENOMEM);
4087			}
4088			SCTP_ALIGN_TO_END(newm, len);
4089			SCTP_BUF_LEN(newm) = len;
4090			SCTP_BUF_NEXT(newm) = m;
4091			m = newm;
4092			if (net != NULL) {
4093#ifdef INVARIANTS
4094				if (net->flowidset == 0) {
4095					panic("Flow ID not set");
4096				}
4097#endif
4098				m->m_pkthdr.flowid = net->flowid;
4099				m->m_flags |= M_FLOWID;
4100			} else {
4101				if (use_mflowid != 0) {
4102					m->m_pkthdr.flowid = mflowid;
4103					m->m_flags |= M_FLOWID;
4104				}
4105			}
4106			packet_length = sctp_calculate_len(m);
4107			ip = mtod(m, struct ip *);
4108			ip->ip_v = IPVERSION;
4109			ip->ip_hl = (sizeof(struct ip) >> 2);
4110			if (tos_value == 0) {
4111				/*
4112				 * This means especially, that it is not set
4113				 * at the SCTP layer. So use the value from
4114				 * the IP layer.
4115				 */
4116				tos_value = inp->ip_inp.inp.inp_ip_tos;
4117			}
4118			tos_value &= 0xfc;
4119			if (ecn_ok) {
4120				tos_value |= sctp_get_ect(stcb);
4121			}
4122			if ((nofragment_flag) && (port == 0)) {
4123				ip->ip_off = htons(IP_DF);
4124			} else {
4125				ip->ip_off = htons(0);
4126			}
4127			/* FreeBSD has a function for ip_id's */
4128			ip->ip_id = ip_newid();
4129
4130			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4131			ip->ip_len = htons(packet_length);
4132			ip->ip_tos = tos_value;
4133			if (port) {
4134				ip->ip_p = IPPROTO_UDP;
4135			} else {
4136				ip->ip_p = IPPROTO_SCTP;
4137			}
4138			ip->ip_sum = 0;
4139			if (net == NULL) {
4140				ro = &iproute;
4141				memset(&iproute, 0, sizeof(iproute));
4142				memcpy(&ro->ro_dst, to, to->sa_len);
4143			} else {
4144				ro = (sctp_route_t *) & net->ro;
4145			}
4146			/* Now the address selection part */
4147			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4148
4149			/* call the routine to select the src address */
4150			if (net && out_of_asoc_ok == 0) {
4151				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4152					sctp_free_ifa(net->ro._s_addr);
4153					net->ro._s_addr = NULL;
4154					net->src_addr_selected = 0;
4155					if (ro->ro_rt) {
4156						RTFREE(ro->ro_rt);
4157						ro->ro_rt = NULL;
4158					}
4159				}
4160				if (net->src_addr_selected == 0) {
4161					/* Cache the source address */
4162					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4163					    ro, net, 0,
4164					    vrf_id);
4165					net->src_addr_selected = 1;
4166				}
4167				if (net->ro._s_addr == NULL) {
4168					/* No route to host */
4169					net->src_addr_selected = 0;
4170					sctp_handle_no_route(stcb, net, so_locked);
4171					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4172					sctp_m_freem(m);
4173					return (EHOSTUNREACH);
4174				}
4175				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4176			} else {
4177				if (over_addr == NULL) {
4178					struct sctp_ifa *_lsrc;
4179
4180					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4181					    net,
4182					    out_of_asoc_ok,
4183					    vrf_id);
4184					if (_lsrc == NULL) {
4185						sctp_handle_no_route(stcb, net, so_locked);
4186						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4187						sctp_m_freem(m);
4188						return (EHOSTUNREACH);
4189					}
4190					ip->ip_src = _lsrc->address.sin.sin_addr;
4191					sctp_free_ifa(_lsrc);
4192				} else {
4193					ip->ip_src = over_addr->sin.sin_addr;
4194					SCTP_RTALLOC(ro, vrf_id);
4195				}
4196			}
4197			if (port) {
4198				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4199					sctp_handle_no_route(stcb, net, so_locked);
4200					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201					sctp_m_freem(m);
4202					return (EHOSTUNREACH);
4203				}
4204				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4205				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4206				udp->uh_dport = port;
4207				udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4208				if (V_udp_cksum) {
4209					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4210				} else {
4211					udp->uh_sum = 0;
4212				}
4213				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4214			} else {
4215				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4216			}
4217
4218			sctphdr->src_port = src_port;
4219			sctphdr->dest_port = dest_port;
4220			sctphdr->v_tag = v_tag;
4221			sctphdr->checksum = 0;
4222
4223			/*
4224			 * If source address selection fails and we find no
4225			 * route then the ip_output should fail as well with
4226			 * a NO_ROUTE_TO_HOST type error. We probably should
4227			 * catch that somewhere and abort the association
4228			 * right away (assuming this is an INIT being sent).
4229			 */
4230			if (ro->ro_rt == NULL) {
4231				/*
4232				 * src addr selection failed to find a route
4233				 * (or valid source addr), so we can't get
4234				 * there from here (yet)!
4235				 */
4236				sctp_handle_no_route(stcb, net, so_locked);
4237				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4238				sctp_m_freem(m);
4239				return (EHOSTUNREACH);
4240			}
4241			if (ro != &iproute) {
4242				memcpy(&iproute, ro, sizeof(*ro));
4243			}
4244			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4245			    (uint32_t) (ntohl(ip->ip_src.s_addr)));
4246			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4247			    (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4248			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4249			    (void *)ro->ro_rt);
4250
4251			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4252				/* failed to prepend data, give up */
4253				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4254				sctp_m_freem(m);
4255				return (ENOMEM);
4256			}
4257			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4258			if (port) {
4259#if defined(SCTP_WITH_NO_CSUM)
4260				SCTP_STAT_INCR(sctps_sendnocrc);
4261#else
4262				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4263				SCTP_STAT_INCR(sctps_sendswcrc);
4264#endif
4265				if (V_udp_cksum) {
4266					SCTP_ENABLE_UDP_CSUM(o_pak);
4267				}
4268			} else {
4269#if defined(SCTP_WITH_NO_CSUM)
4270				SCTP_STAT_INCR(sctps_sendnocrc);
4271#else
4272				m->m_pkthdr.csum_flags = CSUM_SCTP;
4273				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4274				SCTP_STAT_INCR(sctps_sendhwcrc);
4275#endif
4276			}
4277#ifdef SCTP_PACKET_LOGGING
4278			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4279				sctp_packet_log(o_pak);
4280#endif
4281			/* send it out.  table id is taken from stcb */
4282#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4283			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4284				so = SCTP_INP_SO(inp);
4285				SCTP_SOCKET_UNLOCK(so, 0);
4286			}
4287#endif
4288			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4289#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4290			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4291				atomic_add_int(&stcb->asoc.refcnt, 1);
4292				SCTP_TCB_UNLOCK(stcb);
4293				SCTP_SOCKET_LOCK(so, 0);
4294				SCTP_TCB_LOCK(stcb);
4295				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4296			}
4297#endif
4298			SCTP_STAT_INCR(sctps_sendpackets);
4299			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4300			if (ret)
4301				SCTP_STAT_INCR(sctps_senderrors);
4302
4303			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4304			if (net == NULL) {
4305				/* free tempy routes */
4306				RO_RTFREE(ro);
4307			} else {
4308				/*
4309				 * PMTU check versus smallest asoc MTU goes
4310				 * here
4311				 */
4312				if ((ro->ro_rt != NULL) &&
4313				    (net->ro._s_addr)) {
4314					uint32_t mtu;
4315
4316					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4317					if (net->port) {
4318						mtu -= sizeof(struct udphdr);
4319					}
4320					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4321						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4322						net->mtu = mtu;
4323					}
4324				} else if (ro->ro_rt == NULL) {
4325					/* route was freed */
4326					if (net->ro._s_addr &&
4327					    net->src_addr_selected) {
4328						sctp_free_ifa(net->ro._s_addr);
4329						net->ro._s_addr = NULL;
4330					}
4331					net->src_addr_selected = 0;
4332				}
4333			}
4334			return (ret);
4335		}
4336#endif
4337#ifdef INET6
4338	case AF_INET6:
4339		{
4340			uint32_t flowlabel, flowinfo;
4341			struct ip6_hdr *ip6h;
4342			struct route_in6 ip6route;
4343			struct ifnet *ifp;
4344			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4345			int prev_scope = 0;
4346			struct sockaddr_in6 lsa6_storage;
4347			int error;
4348			u_short prev_port = 0;
4349			int len;
4350
4351			if (net) {
4352				flowlabel = net->flowlabel;
4353			} else if (stcb) {
4354				flowlabel = stcb->asoc.default_flowlabel;
4355			} else {
4356				flowlabel = inp->sctp_ep.default_flowlabel;
4357			}
4358			if (flowlabel == 0) {
4359				/*
4360				 * This means especially, that it is not set
4361				 * at the SCTP layer. So use the value from
4362				 * the IP layer.
4363				 */
4364				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4365			}
4366			flowlabel &= 0x000fffff;
4367			len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4368			if (port) {
4369				len += sizeof(struct udphdr);
4370			}
4371			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4372			if (newm == NULL) {
4373				sctp_m_freem(m);
4374				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4375				return (ENOMEM);
4376			}
4377			SCTP_ALIGN_TO_END(newm, len);
4378			SCTP_BUF_LEN(newm) = len;
4379			SCTP_BUF_NEXT(newm) = m;
4380			m = newm;
4381			if (net != NULL) {
4382#ifdef INVARIANTS
4383				if (net->flowidset == 0) {
4384					panic("Flow ID not set");
4385				}
4386#endif
4387				m->m_pkthdr.flowid = net->flowid;
4388				m->m_flags |= M_FLOWID;
4389			} else {
4390				if (use_mflowid != 0) {
4391					m->m_pkthdr.flowid = mflowid;
4392					m->m_flags |= M_FLOWID;
4393				}
4394			}
4395			packet_length = sctp_calculate_len(m);
4396
4397			ip6h = mtod(m, struct ip6_hdr *);
4398			/* protect *sin6 from overwrite */
4399			sin6 = (struct sockaddr_in6 *)to;
4400			tmp = *sin6;
4401			sin6 = &tmp;
4402
4403			/* KAME hack: embed scopeid */
4404			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4405				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4406				return (EINVAL);
4407			}
4408			if (net == NULL) {
4409				memset(&ip6route, 0, sizeof(ip6route));
4410				ro = (sctp_route_t *) & ip6route;
4411				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4412			} else {
4413				ro = (sctp_route_t *) & net->ro;
4414			}
4415			/*
4416			 * We assume here that inp_flow is in host byte
4417			 * order within the TCB!
4418			 */
4419			if (tos_value == 0) {
4420				/*
4421				 * This means especially, that it is not set
4422				 * at the SCTP layer. So use the value from
4423				 * the IP layer.
4424				 */
4425				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4426			}
4427			tos_value &= 0xfc;
4428			if (ecn_ok) {
4429				tos_value |= sctp_get_ect(stcb);
4430			}
4431			flowinfo = 0x06;
4432			flowinfo <<= 8;
4433			flowinfo |= tos_value;
4434			flowinfo <<= 20;
4435			flowinfo |= flowlabel;
4436			ip6h->ip6_flow = htonl(flowinfo);
4437			if (port) {
4438				ip6h->ip6_nxt = IPPROTO_UDP;
4439			} else {
4440				ip6h->ip6_nxt = IPPROTO_SCTP;
4441			}
4442			ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4443			ip6h->ip6_dst = sin6->sin6_addr;
4444
4445			/*
4446			 * Add SRC address selection here: we can only reuse
4447			 * to a limited degree the kame src-addr-sel, since
4448			 * we can try their selection but it may not be
4449			 * bound.
4450			 */
4451			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4452			lsa6_tmp.sin6_family = AF_INET6;
4453			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4454			lsa6 = &lsa6_tmp;
4455			if (net && out_of_asoc_ok == 0) {
4456				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4457					sctp_free_ifa(net->ro._s_addr);
4458					net->ro._s_addr = NULL;
4459					net->src_addr_selected = 0;
4460					if (ro->ro_rt) {
4461						RTFREE(ro->ro_rt);
4462						ro->ro_rt = NULL;
4463					}
4464				}
4465				if (net->src_addr_selected == 0) {
4466					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4467					/* KAME hack: embed scopeid */
4468					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4469						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4470						return (EINVAL);
4471					}
4472					/* Cache the source address */
4473					net->ro._s_addr = sctp_source_address_selection(inp,
4474					    stcb,
4475					    ro,
4476					    net,
4477					    0,
4478					    vrf_id);
4479					(void)sa6_recoverscope(sin6);
4480					net->src_addr_selected = 1;
4481				}
4482				if (net->ro._s_addr == NULL) {
4483					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4484					net->src_addr_selected = 0;
4485					sctp_handle_no_route(stcb, net, so_locked);
4486					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4487					sctp_m_freem(m);
4488					return (EHOSTUNREACH);
4489				}
4490				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4491			} else {
4492				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4493				/* KAME hack: embed scopeid */
4494				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4495					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4496					return (EINVAL);
4497				}
4498				if (over_addr == NULL) {
4499					struct sctp_ifa *_lsrc;
4500
4501					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4502					    net,
4503					    out_of_asoc_ok,
4504					    vrf_id);
4505					if (_lsrc == NULL) {
4506						sctp_handle_no_route(stcb, net, so_locked);
4507						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4508						sctp_m_freem(m);
4509						return (EHOSTUNREACH);
4510					}
4511					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4512					sctp_free_ifa(_lsrc);
4513				} else {
4514					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4515					SCTP_RTALLOC(ro, vrf_id);
4516				}
4517				(void)sa6_recoverscope(sin6);
4518			}
4519			lsa6->sin6_port = inp->sctp_lport;
4520
4521			if (ro->ro_rt == NULL) {
4522				/*
4523				 * src addr selection failed to find a route
4524				 * (or valid source addr), so we can't get
4525				 * there from here!
4526				 */
4527				sctp_handle_no_route(stcb, net, so_locked);
4528				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4529				sctp_m_freem(m);
4530				return (EHOSTUNREACH);
4531			}
4532			/*
4533			 * XXX: sa6 may not have a valid sin6_scope_id in
4534			 * the non-SCOPEDROUTING case.
4535			 */
4536			bzero(&lsa6_storage, sizeof(lsa6_storage));
4537			lsa6_storage.sin6_family = AF_INET6;
4538			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4539			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4540			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4541				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4542				sctp_m_freem(m);
4543				return (error);
4544			}
4545			/* XXX */
4546			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4547			lsa6_storage.sin6_port = inp->sctp_lport;
4548			lsa6 = &lsa6_storage;
4549			ip6h->ip6_src = lsa6->sin6_addr;
4550
4551			if (port) {
4552				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4553					sctp_handle_no_route(stcb, net, so_locked);
4554					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4555					sctp_m_freem(m);
4556					return (EHOSTUNREACH);
4557				}
4558				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4559				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4560				udp->uh_dport = port;
4561				udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4562				udp->uh_sum = 0;
4563				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4564			} else {
4565				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4566			}
4567
4568			sctphdr->src_port = src_port;
4569			sctphdr->dest_port = dest_port;
4570			sctphdr->v_tag = v_tag;
4571			sctphdr->checksum = 0;
4572
4573			/*
4574			 * We set the hop limit now since there is a good
4575			 * chance that our ro pointer is now filled
4576			 */
4577			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4578			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4579
4580#ifdef SCTP_DEBUG
4581			/* Copy to be sure something bad is not happening */
4582			sin6->sin6_addr = ip6h->ip6_dst;
4583			lsa6->sin6_addr = ip6h->ip6_src;
4584#endif
4585
4586			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4587			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4588			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4589			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4590			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4591			if (net) {
4592				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4593				/*
4594				 * preserve the port and scope for link
4595				 * local send
4596				 */
4597				prev_scope = sin6->sin6_scope_id;
4598				prev_port = sin6->sin6_port;
4599			}
4600			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4601				/* failed to prepend data, give up */
4602				sctp_m_freem(m);
4603				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4604				return (ENOMEM);
4605			}
4606			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4607			if (port) {
4608#if defined(SCTP_WITH_NO_CSUM)
4609				SCTP_STAT_INCR(sctps_sendnocrc);
4610#else
4611				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4612				SCTP_STAT_INCR(sctps_sendswcrc);
4613#endif
4614				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4615					udp->uh_sum = 0xffff;
4616				}
4617			} else {
4618#if defined(SCTP_WITH_NO_CSUM)
4619				SCTP_STAT_INCR(sctps_sendnocrc);
4620#else
4621				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4622				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4623				SCTP_STAT_INCR(sctps_sendhwcrc);
4624#endif
4625			}
4626			/* send it out. table id is taken from stcb */
4627#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4628			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4629				so = SCTP_INP_SO(inp);
4630				SCTP_SOCKET_UNLOCK(so, 0);
4631			}
4632#endif
4633#ifdef SCTP_PACKET_LOGGING
4634			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4635				sctp_packet_log(o_pak);
4636#endif
4637			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4638#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4639			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4640				atomic_add_int(&stcb->asoc.refcnt, 1);
4641				SCTP_TCB_UNLOCK(stcb);
4642				SCTP_SOCKET_LOCK(so, 0);
4643				SCTP_TCB_LOCK(stcb);
4644				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4645			}
4646#endif
4647			if (net) {
4648				/* for link local this must be done */
4649				sin6->sin6_scope_id = prev_scope;
4650				sin6->sin6_port = prev_port;
4651			}
4652			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4653			SCTP_STAT_INCR(sctps_sendpackets);
4654			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4655			if (ret) {
4656				SCTP_STAT_INCR(sctps_senderrors);
4657			}
4658			if (net == NULL) {
4659				/* Now if we had a temp route free it */
4660				RO_RTFREE(ro);
4661			} else {
4662				/*
4663				 * PMTU check versus smallest asoc MTU goes
4664				 * here
4665				 */
4666				if (ro->ro_rt == NULL) {
4667					/* Route was freed */
4668					if (net->ro._s_addr &&
4669					    net->src_addr_selected) {
4670						sctp_free_ifa(net->ro._s_addr);
4671						net->ro._s_addr = NULL;
4672					}
4673					net->src_addr_selected = 0;
4674				}
4675				if ((ro->ro_rt != NULL) &&
4676				    (net->ro._s_addr)) {
4677					uint32_t mtu;
4678
4679					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4680					if (mtu &&
4681					    (stcb->asoc.smallest_mtu > mtu)) {
4682						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4683						net->mtu = mtu;
4684						if (net->port) {
4685							net->mtu -= sizeof(struct udphdr);
4686						}
4687					}
4688				} else if (ifp) {
4689					if (ND_IFINFO(ifp)->linkmtu &&
4690					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4691						sctp_mtu_size_reset(inp,
4692						    &stcb->asoc,
4693						    ND_IFINFO(ifp)->linkmtu);
4694					}
4695				}
4696			}
4697			return (ret);
4698		}
4699#endif
4700	default:
4701		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4702		    ((struct sockaddr *)to)->sa_family);
4703		sctp_m_freem(m);
4704		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4705		return (EFAULT);
4706	}
4707}
4708
4709
4710void
4711sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4712#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4713    SCTP_UNUSED
4714#endif
4715)
4716{
4717	struct mbuf *m, *m_last;
4718	struct sctp_nets *net;
4719	struct sctp_init_chunk *init;
4720	struct sctp_supported_addr_param *sup_addr;
4721	struct sctp_adaptation_layer_indication *ali;
4722	struct sctp_supported_chunk_types_param *pr_supported;
4723	struct sctp_paramhdr *ph;
4724	int cnt_inits_to = 0;
4725	int ret;
4726	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4727
4728	/* INIT's always go to the primary (and usually ONLY address) */
4729	net = stcb->asoc.primary_destination;
4730	if (net == NULL) {
4731		net = TAILQ_FIRST(&stcb->asoc.nets);
4732		if (net == NULL) {
4733			/* TSNH */
4734			return;
4735		}
4736		/* we confirm any address we send an INIT to */
4737		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4738		(void)sctp_set_primary_addr(stcb, NULL, net);
4739	} else {
4740		/* we confirm any address we send an INIT to */
4741		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4742	}
4743	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4744#ifdef INET6
4745	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4746		/*
4747		 * special hook, if we are sending to link local it will not
4748		 * show up in our private address count.
4749		 */
4750		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4751			cnt_inits_to = 1;
4752	}
4753#endif
4754	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4755		/* This case should not happen */
4756		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4757		return;
4758	}
4759	/* start the INIT timer */
4760	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4761
4762	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4763	if (m == NULL) {
4764		/* No memory, INIT timer will re-attempt. */
4765		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4766		return;
4767	}
4768	chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4769	padding_len = 0;
4770	/* Now lets put the chunk header in place */
4771	init = mtod(m, struct sctp_init_chunk *);
4772	/* now the chunk header */
4773	init->ch.chunk_type = SCTP_INITIATION;
4774	init->ch.chunk_flags = 0;
4775	/* fill in later from mbuf we build */
4776	init->ch.chunk_length = 0;
4777	/* place in my tag */
4778	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4779	/* set up some of the credits. */
4780	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4781	    SCTP_MINIMAL_RWND));
4782	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4783	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4784	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4785
4786	/* Adaptation layer indication parameter */
4787	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4788		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4789		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4790		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4791		ali->ph.param_length = htons(parameter_len);
4792		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4793		chunk_len += parameter_len;
4794	}
4795	/* ECN parameter */
4796	if (stcb->asoc.ecn_supported == 1) {
4797		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4798		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4799		ph->param_type = htons(SCTP_ECN_CAPABLE);
4800		ph->param_length = htons(parameter_len);
4801		chunk_len += parameter_len;
4802	}
4803	/* PR-SCTP supported parameter */
4804	if (stcb->asoc.prsctp_supported == 1) {
4805		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4806		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4807		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4808		ph->param_length = htons(parameter_len);
4809		chunk_len += parameter_len;
4810	}
4811	/* Add NAT friendly parameter. */
4812	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4813		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4814		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4815		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4816		ph->param_length = htons(parameter_len);
4817		chunk_len += parameter_len;
4818	}
4819	/* And now tell the peer which extensions we support */
4820	num_ext = 0;
4821	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4822	if (stcb->asoc.prsctp_supported == 1) {
4823		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4824	}
4825	if (stcb->asoc.auth_supported == 1) {
4826		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4827	}
4828	if (stcb->asoc.asconf_supported == 1) {
4829		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4830		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4831	}
4832	if (stcb->asoc.reconfig_supported == 1) {
4833		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4834	}
4835	if (stcb->asoc.nrsack_supported == 1) {
4836		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4837	}
4838	if (stcb->asoc.pktdrop_supported == 1) {
4839		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4840	}
4841	if (num_ext > 0) {
4842		parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4843		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4844		pr_supported->ph.param_length = htons(parameter_len);
4845		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4846		chunk_len += parameter_len;
4847	}
4848	/* add authentication parameters */
4849	if (stcb->asoc.auth_supported) {
4850		/* attach RANDOM parameter, if available */
4851		if (stcb->asoc.authinfo.random != NULL) {
4852			struct sctp_auth_random *randp;
4853
4854			if (padding_len > 0) {
4855				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4856				chunk_len += padding_len;
4857				padding_len = 0;
4858			}
4859			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4860			parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4861			/* random key already contains the header */
4862			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4863			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4864			chunk_len += parameter_len;
4865		}
4866		/* add HMAC_ALGO parameter */
4867		if (stcb->asoc.local_hmacs != NULL) {
4868			struct sctp_auth_hmac_algo *hmacs;
4869
4870			if (padding_len > 0) {
4871				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4872				chunk_len += padding_len;
4873				padding_len = 0;
4874			}
4875			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4876			parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4877			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4878			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4879			hmacs->ph.param_length = htons(parameter_len);
4880			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4881			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4882			chunk_len += parameter_len;
4883		}
4884		/* add CHUNKS parameter */
4885		if (stcb->asoc.local_auth_chunks != NULL) {
4886			struct sctp_auth_chunk_list *chunks;
4887
4888			if (padding_len > 0) {
4889				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4890				chunk_len += padding_len;
4891				padding_len = 0;
4892			}
4893			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4894			parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4895			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4896			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4897			chunks->ph.param_length = htons(parameter_len);
4898			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4899			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4900			chunk_len += parameter_len;
4901		}
4902	}
4903	/* now any cookie time extensions */
4904	if (stcb->asoc.cookie_preserve_req) {
4905		struct sctp_cookie_perserve_param *cookie_preserve;
4906
4907		if (padding_len > 0) {
4908			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4909			chunk_len += padding_len;
4910			padding_len = 0;
4911		}
4912		parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4913		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4914		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4915		cookie_preserve->ph.param_length = htons(parameter_len);
4916		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4917		stcb->asoc.cookie_preserve_req = 0;
4918		chunk_len += parameter_len;
4919	}
4920	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4921		uint8_t i;
4922
4923		if (padding_len > 0) {
4924			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4925			chunk_len += padding_len;
4926			padding_len = 0;
4927		}
4928		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4929		if (stcb->asoc.scope.ipv4_addr_legal) {
4930			parameter_len += (uint16_t) sizeof(uint16_t);
4931		}
4932		if (stcb->asoc.scope.ipv6_addr_legal) {
4933			parameter_len += (uint16_t) sizeof(uint16_t);
4934		}
4935		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4936		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4937		sup_addr->ph.param_length = htons(parameter_len);
4938		i = 0;
4939		if (stcb->asoc.scope.ipv4_addr_legal) {
4940			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4941		}
4942		if (stcb->asoc.scope.ipv6_addr_legal) {
4943			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4944		}
4945		padding_len = 4 - 2 * i;
4946		chunk_len += parameter_len;
4947	}
4948	SCTP_BUF_LEN(m) = chunk_len;
4949	/* now the addresses */
4950	/*
4951	 * To optimize this we could put the scoping stuff into a structure
4952	 * and remove the individual uint8's from the assoc structure. Then
4953	 * we could just sifa in the address within the stcb. But for now
4954	 * this is a quick hack to get the address stuff teased apart.
4955	 */
4956	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4957	    m, cnt_inits_to,
4958	    &padding_len, &chunk_len);
4959
4960	init->ch.chunk_length = htons(chunk_len);
4961	if (padding_len > 0) {
4962		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4963			sctp_m_freem(m);
4964			return;
4965		}
4966	}
4967	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4968	ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4969	    (struct sockaddr *)&net->ro._l_addr,
4970	    m, 0, NULL, 0, 0, 0, 0,
4971	    inp->sctp_lport, stcb->rport, htonl(0),
4972	    net->port, NULL,
4973	    0, 0,
4974	    so_locked);
4975	SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4976	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4977	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4978}
4979
4980struct mbuf *
4981sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4982    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4983{
4984	/*
4985	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4986	 * being equal to the beginning of the params i.e. (iphlen +
4987	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4988	 * end of the mbuf verifying that all parameters are known.
4989	 *
4990	 * For unknown parameters build and return a mbuf with
4991	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4992	 * processing this chunk stop, and set *abort_processing to 1.
4993	 *
4994	 * By having param_offset be pre-set to where parameters begin it is
4995	 * hoped that this routine may be reused in the future by new
4996	 * features.
4997	 */
4998	struct sctp_paramhdr *phdr, params;
4999
5000	struct mbuf *mat, *op_err;
5001	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
5002	int at, limit, pad_needed;
5003	uint16_t ptype, plen, padded_size;
5004	int err_at;
5005
5006	*abort_processing = 0;
5007	mat = in_initpkt;
5008	err_at = 0;
5009	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5010	at = param_offset;
5011	op_err = NULL;
5012	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5013	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5014	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5015		ptype = ntohs(phdr->param_type);
5016		plen = ntohs(phdr->param_length);
5017		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5018			/* wacked parameter */
5019			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5020			goto invalid_size;
5021		}
5022		limit -= SCTP_SIZE32(plen);
5023		/*-
5024		 * All parameters for all chunks that we know/understand are
5025		 * listed here. We process them other places and make
5026		 * appropriate stop actions per the upper bits. However this
5027		 * is the generic routine processor's can call to get back
5028		 * an operr.. to either incorporate (init-ack) or send.
5029		 */
5030		padded_size = SCTP_SIZE32(plen);
5031		switch (ptype) {
5032			/* Param's with variable size */
5033		case SCTP_HEARTBEAT_INFO:
5034		case SCTP_STATE_COOKIE:
5035		case SCTP_UNRECOG_PARAM:
5036		case SCTP_ERROR_CAUSE_IND:
5037			/* ok skip fwd */
5038			at += padded_size;
5039			break;
5040			/* Param's with variable size within a range */
5041		case SCTP_CHUNK_LIST:
5042		case SCTP_SUPPORTED_CHUNK_EXT:
5043			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5044				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5045				goto invalid_size;
5046			}
5047			at += padded_size;
5048			break;
5049		case SCTP_SUPPORTED_ADDRTYPE:
5050			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5051				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5052				goto invalid_size;
5053			}
5054			at += padded_size;
5055			break;
5056		case SCTP_RANDOM:
5057			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5058				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5059				goto invalid_size;
5060			}
5061			at += padded_size;
5062			break;
5063		case SCTP_SET_PRIM_ADDR:
5064		case SCTP_DEL_IP_ADDRESS:
5065		case SCTP_ADD_IP_ADDRESS:
5066			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5067			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5068				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5069				goto invalid_size;
5070			}
5071			at += padded_size;
5072			break;
5073			/* Param's with a fixed size */
5074		case SCTP_IPV4_ADDRESS:
5075			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5076				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5077				goto invalid_size;
5078			}
5079			at += padded_size;
5080			break;
5081		case SCTP_IPV6_ADDRESS:
5082			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5083				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5084				goto invalid_size;
5085			}
5086			at += padded_size;
5087			break;
5088		case SCTP_COOKIE_PRESERVE:
5089			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5090				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5091				goto invalid_size;
5092			}
5093			at += padded_size;
5094			break;
5095		case SCTP_HAS_NAT_SUPPORT:
5096			*nat_friendly = 1;
5097			/* fall through */
5098		case SCTP_PRSCTP_SUPPORTED:
5099			if (padded_size != sizeof(struct sctp_paramhdr)) {
5100				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5101				goto invalid_size;
5102			}
5103			at += padded_size;
5104			break;
5105		case SCTP_ECN_CAPABLE:
5106			if (padded_size != sizeof(struct sctp_paramhdr)) {
5107				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5108				goto invalid_size;
5109			}
5110			at += padded_size;
5111			break;
5112		case SCTP_ULP_ADAPTATION:
5113			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5114				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5115				goto invalid_size;
5116			}
5117			at += padded_size;
5118			break;
5119		case SCTP_SUCCESS_REPORT:
5120			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5121				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5122				goto invalid_size;
5123			}
5124			at += padded_size;
5125			break;
5126		case SCTP_HOSTNAME_ADDRESS:
5127			{
5128				/* We can NOT handle HOST NAME addresses!! */
5129				int l_len;
5130
5131				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5132				*abort_processing = 1;
5133				if (op_err == NULL) {
5134					/* Ok need to try to get a mbuf */
5135#ifdef INET6
5136					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5137#else
5138					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5139#endif
5140					l_len += plen;
5141					l_len += sizeof(struct sctp_paramhdr);
5142					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5143					if (op_err) {
5144						SCTP_BUF_LEN(op_err) = 0;
5145						/*
5146						 * pre-reserve space for ip
5147						 * and sctp header  and
5148						 * chunk hdr
5149						 */
5150#ifdef INET6
5151						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5152#else
5153						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5154#endif
5155						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5156						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5157					}
5158				}
5159				if (op_err) {
5160					/* If we have space */
5161					struct sctp_paramhdr s;
5162
5163					if (err_at % 4) {
5164						uint32_t cpthis = 0;
5165
5166						pad_needed = 4 - (err_at % 4);
5167						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5168						err_at += pad_needed;
5169					}
5170					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5171					s.param_length = htons(sizeof(s) + plen);
5172					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5173					err_at += sizeof(s);
5174					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5175					if (phdr == NULL) {
5176						sctp_m_freem(op_err);
5177						/*
5178						 * we are out of memory but
5179						 * we still need to have a
5180						 * look at what to do (the
5181						 * system is in trouble
5182						 * though).
5183						 */
5184						return (NULL);
5185					}
5186					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5187				}
5188				return (op_err);
5189				break;
5190			}
5191		default:
5192			/*
5193			 * we do not recognize the parameter figure out what
5194			 * we do.
5195			 */
5196			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5197			if ((ptype & 0x4000) == 0x4000) {
5198				/* Report bit is set?? */
5199				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5200				if (op_err == NULL) {
5201					int l_len;
5202
5203					/* Ok need to try to get an mbuf */
5204#ifdef INET6
5205					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5206#else
5207					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5208#endif
5209					l_len += plen;
5210					l_len += sizeof(struct sctp_paramhdr);
5211					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5212					if (op_err) {
5213						SCTP_BUF_LEN(op_err) = 0;
5214#ifdef INET6
5215						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5216#else
5217						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5218#endif
5219						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5220						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5221					}
5222				}
5223				if (op_err) {
5224					/* If we have space */
5225					struct sctp_paramhdr s;
5226
5227					if (err_at % 4) {
5228						uint32_t cpthis = 0;
5229
5230						pad_needed = 4 - (err_at % 4);
5231						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5232						err_at += pad_needed;
5233					}
5234					s.param_type = htons(SCTP_UNRECOG_PARAM);
5235					s.param_length = htons(sizeof(s) + plen);
5236					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5237					err_at += sizeof(s);
5238					if (plen > sizeof(tempbuf)) {
5239						plen = sizeof(tempbuf);
5240					}
5241					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5242					if (phdr == NULL) {
5243						sctp_m_freem(op_err);
5244						/*
5245						 * we are out of memory but
5246						 * we still need to have a
5247						 * look at what to do (the
5248						 * system is in trouble
5249						 * though).
5250						 */
5251						op_err = NULL;
5252						goto more_processing;
5253					}
5254					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5255					err_at += plen;
5256				}
5257			}
5258	more_processing:
5259			if ((ptype & 0x8000) == 0x0000) {
5260				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5261				return (op_err);
5262			} else {
5263				/* skip this chunk and continue processing */
5264				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5265				at += SCTP_SIZE32(plen);
5266			}
5267			break;
5268
5269		}
5270		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5271	}
5272	return (op_err);
5273invalid_size:
5274	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5275	*abort_processing = 1;
5276	if ((op_err == NULL) && phdr) {
5277		int l_len;
5278
5279#ifdef INET6
5280		l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5281#else
5282		l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5283#endif
5284		l_len += (2 * sizeof(struct sctp_paramhdr));
5285		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5286		if (op_err) {
5287			SCTP_BUF_LEN(op_err) = 0;
5288#ifdef INET6
5289			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5290#else
5291			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5292#endif
5293			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5294			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5295		}
5296	}
5297	if ((op_err) && phdr) {
5298		struct sctp_paramhdr s;
5299
5300		if (err_at % 4) {
5301			uint32_t cpthis = 0;
5302
5303			pad_needed = 4 - (err_at % 4);
5304			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5305			err_at += pad_needed;
5306		}
5307		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5308		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5309		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5310		err_at += sizeof(s);
5311		/* Only copy back the p-hdr that caused the issue */
5312		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5313	}
5314	return (op_err);
5315}
5316
5317static int
5318sctp_are_there_new_addresses(struct sctp_association *asoc,
5319    struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5320{
5321	/*
5322	 * Given a INIT packet, look through the packet to verify that there
5323	 * are NO new addresses. As we go through the parameters add reports
5324	 * of any un-understood parameters that require an error.  Also we
5325	 * must return (1) to drop the packet if we see a un-understood
5326	 * parameter that tells us to drop the chunk.
5327	 */
5328	struct sockaddr *sa_touse;
5329	struct sockaddr *sa;
5330	struct sctp_paramhdr *phdr, params;
5331	uint16_t ptype, plen;
5332	uint8_t fnd;
5333	struct sctp_nets *net;
5334
5335#ifdef INET
5336	struct sockaddr_in sin4, *sa4;
5337
5338#endif
5339#ifdef INET6
5340	struct sockaddr_in6 sin6, *sa6;
5341
5342#endif
5343
5344#ifdef INET
5345	memset(&sin4, 0, sizeof(sin4));
5346	sin4.sin_family = AF_INET;
5347	sin4.sin_len = sizeof(sin4);
5348#endif
5349#ifdef INET6
5350	memset(&sin6, 0, sizeof(sin6));
5351	sin6.sin6_family = AF_INET6;
5352	sin6.sin6_len = sizeof(sin6);
5353#endif
5354	/* First what about the src address of the pkt ? */
5355	fnd = 0;
5356	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5357		sa = (struct sockaddr *)&net->ro._l_addr;
5358		if (sa->sa_family == src->sa_family) {
5359#ifdef INET
5360			if (sa->sa_family == AF_INET) {
5361				struct sockaddr_in *src4;
5362
5363				sa4 = (struct sockaddr_in *)sa;
5364				src4 = (struct sockaddr_in *)src;
5365				if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5366					fnd = 1;
5367					break;
5368				}
5369			}
5370#endif
5371#ifdef INET6
5372			if (sa->sa_family == AF_INET6) {
5373				struct sockaddr_in6 *src6;
5374
5375				sa6 = (struct sockaddr_in6 *)sa;
5376				src6 = (struct sockaddr_in6 *)src;
5377				if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5378					fnd = 1;
5379					break;
5380				}
5381			}
5382#endif
5383		}
5384	}
5385	if (fnd == 0) {
5386		/* New address added! no need to look futher. */
5387		return (1);
5388	}
5389	/* Ok so far lets munge through the rest of the packet */
5390	offset += sizeof(struct sctp_init_chunk);
5391	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5392	while (phdr) {
5393		sa_touse = NULL;
5394		ptype = ntohs(phdr->param_type);
5395		plen = ntohs(phdr->param_length);
5396		switch (ptype) {
5397#ifdef INET
5398		case SCTP_IPV4_ADDRESS:
5399			{
5400				struct sctp_ipv4addr_param *p4, p4_buf;
5401
5402				phdr = sctp_get_next_param(in_initpkt, offset,
5403				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5404				if (plen != sizeof(struct sctp_ipv4addr_param) ||
5405				    phdr == NULL) {
5406					return (1);
5407				}
5408				p4 = (struct sctp_ipv4addr_param *)phdr;
5409				sin4.sin_addr.s_addr = p4->addr;
5410				sa_touse = (struct sockaddr *)&sin4;
5411				break;
5412			}
5413#endif
5414#ifdef INET6
5415		case SCTP_IPV6_ADDRESS:
5416			{
5417				struct sctp_ipv6addr_param *p6, p6_buf;
5418
5419				phdr = sctp_get_next_param(in_initpkt, offset,
5420				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5421				if (plen != sizeof(struct sctp_ipv6addr_param) ||
5422				    phdr == NULL) {
5423					return (1);
5424				}
5425				p6 = (struct sctp_ipv6addr_param *)phdr;
5426				memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5427				    sizeof(p6->addr));
5428				sa_touse = (struct sockaddr *)&sin6;
5429				break;
5430			}
5431#endif
5432		default:
5433			sa_touse = NULL;
5434			break;
5435		}
5436		if (sa_touse) {
5437			/* ok, sa_touse points to one to check */
5438			fnd = 0;
5439			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5440				sa = (struct sockaddr *)&net->ro._l_addr;
5441				if (sa->sa_family != sa_touse->sa_family) {
5442					continue;
5443				}
5444#ifdef INET
5445				if (sa->sa_family == AF_INET) {
5446					sa4 = (struct sockaddr_in *)sa;
5447					if (sa4->sin_addr.s_addr ==
5448					    sin4.sin_addr.s_addr) {
5449						fnd = 1;
5450						break;
5451					}
5452				}
5453#endif
5454#ifdef INET6
5455				if (sa->sa_family == AF_INET6) {
5456					sa6 = (struct sockaddr_in6 *)sa;
5457					if (SCTP6_ARE_ADDR_EQUAL(
5458					    sa6, &sin6)) {
5459						fnd = 1;
5460						break;
5461					}
5462				}
5463#endif
5464			}
5465			if (!fnd) {
5466				/* New addr added! no need to look further */
5467				return (1);
5468			}
5469		}
5470		offset += SCTP_SIZE32(plen);
5471		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5472	}
5473	return (0);
5474}
5475
5476/*
5477 * Given a MBUF chain that was sent into us containing an INIT. Build a
5478 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5479 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5480 * message (i.e. the struct sctp_init_msg).
5481 */
5482void
5483sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5484    struct mbuf *init_pkt, int iphlen, int offset,
5485    struct sockaddr *src, struct sockaddr *dst,
5486    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5487    uint8_t use_mflowid, uint32_t mflowid,
5488    uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5489{
5490	struct sctp_association *asoc;
5491	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5492	struct sctp_init_ack_chunk *initack;
5493	struct sctp_adaptation_layer_indication *ali;
5494	struct sctp_supported_chunk_types_param *pr_supported;
5495	struct sctp_paramhdr *ph;
5496	union sctp_sockstore *over_addr;
5497	struct sctp_scoping scp;
5498
5499#ifdef INET
5500	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5501	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5502	struct sockaddr_in *sin;
5503
5504#endif
5505#ifdef INET6
5506	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5507	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5508	struct sockaddr_in6 *sin6;
5509
5510#endif
5511	struct sockaddr *to;
5512	struct sctp_state_cookie stc;
5513	struct sctp_nets *net = NULL;
5514	uint8_t *signature = NULL;
5515	int cnt_inits_to = 0;
5516	uint16_t his_limit, i_want;
5517	int abort_flag;
5518	int nat_friendly = 0;
5519	struct socket *so;
5520	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5521
5522	if (stcb) {
5523		asoc = &stcb->asoc;
5524	} else {
5525		asoc = NULL;
5526	}
5527	if ((asoc != NULL) &&
5528	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5529	    (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5530		/* new addresses, out of here in non-cookie-wait states */
5531		/*
5532		 * Send a ABORT, we don't add the new address error clause
5533		 * though we even set the T bit and copy in the 0 tag.. this
5534		 * looks no different than if no listener was present.
5535		 */
5536		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5537		    "Address added");
5538		sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5539		    use_mflowid, mflowid,
5540		    vrf_id, port);
5541		return;
5542	}
5543	abort_flag = 0;
5544	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5545	    (offset + sizeof(struct sctp_init_chunk)),
5546	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5547	if (abort_flag) {
5548do_a_abort:
5549		if (op_err == NULL) {
5550			char msg[SCTP_DIAG_INFO_LEN];
5551
5552			snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5553			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5554			    msg);
5555		}
5556		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5557		    init_chk->init.initiate_tag, op_err,
5558		    use_mflowid, mflowid,
5559		    vrf_id, port);
5560		return;
5561	}
5562	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5563	if (m == NULL) {
5564		/* No memory, INIT timer will re-attempt. */
5565		if (op_err)
5566			sctp_m_freem(op_err);
5567		return;
5568	}
5569	chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5570	padding_len = 0;
5571
5572	/*
5573	 * We might not overwrite the identification[] completely and on
5574	 * some platforms time_entered will contain some padding. Therefore
5575	 * zero out the cookie to avoid putting uninitialized memory on the
5576	 * wire.
5577	 */
5578	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5579
5580	/* the time I built cookie */
5581	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5582
5583	/* populate any tie tags */
5584	if (asoc != NULL) {
5585		/* unlock before tag selections */
5586		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5587		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5588		stc.cookie_life = asoc->cookie_life;
5589		net = asoc->primary_destination;
5590	} else {
5591		stc.tie_tag_my_vtag = 0;
5592		stc.tie_tag_peer_vtag = 0;
5593		/* life I will award this cookie */
5594		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5595	}
5596
5597	/* copy in the ports for later check */
5598	stc.myport = sh->dest_port;
5599	stc.peerport = sh->src_port;
5600
5601	/*
5602	 * If we wanted to honor cookie life extentions, we would add to
5603	 * stc.cookie_life. For now we should NOT honor any extension
5604	 */
5605	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5606	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5607		stc.ipv6_addr_legal = 1;
5608		if (SCTP_IPV6_V6ONLY(inp)) {
5609			stc.ipv4_addr_legal = 0;
5610		} else {
5611			stc.ipv4_addr_legal = 1;
5612		}
5613	} else {
5614		stc.ipv6_addr_legal = 0;
5615		stc.ipv4_addr_legal = 1;
5616	}
5617#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5618	stc.ipv4_scope = 1;
5619#else
5620	stc.ipv4_scope = 0;
5621#endif
5622	if (net == NULL) {
5623		to = src;
5624		switch (dst->sa_family) {
5625#ifdef INET
5626		case AF_INET:
5627			{
5628				/* lookup address */
5629				stc.address[0] = src4->sin_addr.s_addr;
5630				stc.address[1] = 0;
5631				stc.address[2] = 0;
5632				stc.address[3] = 0;
5633				stc.addr_type = SCTP_IPV4_ADDRESS;
5634				/* local from address */
5635				stc.laddress[0] = dst4->sin_addr.s_addr;
5636				stc.laddress[1] = 0;
5637				stc.laddress[2] = 0;
5638				stc.laddress[3] = 0;
5639				stc.laddr_type = SCTP_IPV4_ADDRESS;
5640				/* scope_id is only for v6 */
5641				stc.scope_id = 0;
5642#ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5643				if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5644					stc.ipv4_scope = 1;
5645				}
5646#else
5647				stc.ipv4_scope = 1;
5648#endif				/* SCTP_DONT_DO_PRIVADDR_SCOPE */
5649				/* Must use the address in this case */
5650				if (sctp_is_address_on_local_host(src, vrf_id)) {
5651					stc.loopback_scope = 1;
5652					stc.ipv4_scope = 1;
5653					stc.site_scope = 1;
5654					stc.local_scope = 0;
5655				}
5656				break;
5657			}
5658#endif
5659#ifdef INET6
5660		case AF_INET6:
5661			{
5662				stc.addr_type = SCTP_IPV6_ADDRESS;
5663				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5664				stc.scope_id = in6_getscope(&src6->sin6_addr);
5665				if (sctp_is_address_on_local_host(src, vrf_id)) {
5666					stc.loopback_scope = 1;
5667					stc.local_scope = 0;
5668					stc.site_scope = 1;
5669					stc.ipv4_scope = 1;
5670				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5671					/*
5672					 * If the new destination is a
5673					 * LINK_LOCAL we must have common
5674					 * both site and local scope. Don't
5675					 * set local scope though since we
5676					 * must depend on the source to be
5677					 * added implicitly. We cannot
5678					 * assure just because we share one
5679					 * link that all links are common.
5680					 */
5681					stc.local_scope = 0;
5682					stc.site_scope = 1;
5683					stc.ipv4_scope = 1;
5684					/*
5685					 * we start counting for the private
5686					 * address stuff at 1. since the
5687					 * link local we source from won't
5688					 * show up in our scoped count.
5689					 */
5690					cnt_inits_to = 1;
5691					/*
5692					 * pull out the scope_id from
5693					 * incoming pkt
5694					 */
5695				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5696					/*
5697					 * If the new destination is
5698					 * SITE_LOCAL then we must have site
5699					 * scope in common.
5700					 */
5701					stc.site_scope = 1;
5702				}
5703				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5704				stc.laddr_type = SCTP_IPV6_ADDRESS;
5705				break;
5706			}
5707#endif
5708		default:
5709			/* TSNH */
5710			goto do_a_abort;
5711			break;
5712		}
5713	} else {
5714		/* set the scope per the existing tcb */
5715
5716#ifdef INET6
5717		struct sctp_nets *lnet;
5718
5719#endif
5720
5721		stc.loopback_scope = asoc->scope.loopback_scope;
5722		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5723		stc.site_scope = asoc->scope.site_scope;
5724		stc.local_scope = asoc->scope.local_scope;
5725#ifdef INET6
5726		/* Why do we not consider IPv4 LL addresses? */
5727		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5728			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5729				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5730					/*
5731					 * if we have a LL address, start
5732					 * counting at 1.
5733					 */
5734					cnt_inits_to = 1;
5735				}
5736			}
5737		}
5738#endif
5739		/* use the net pointer */
5740		to = (struct sockaddr *)&net->ro._l_addr;
5741		switch (to->sa_family) {
5742#ifdef INET
5743		case AF_INET:
5744			sin = (struct sockaddr_in *)to;
5745			stc.address[0] = sin->sin_addr.s_addr;
5746			stc.address[1] = 0;
5747			stc.address[2] = 0;
5748			stc.address[3] = 0;
5749			stc.addr_type = SCTP_IPV4_ADDRESS;
5750			if (net->src_addr_selected == 0) {
5751				/*
5752				 * strange case here, the INIT should have
5753				 * did the selection.
5754				 */
5755				net->ro._s_addr = sctp_source_address_selection(inp,
5756				    stcb, (sctp_route_t *) & net->ro,
5757				    net, 0, vrf_id);
5758				if (net->ro._s_addr == NULL)
5759					return;
5760
5761				net->src_addr_selected = 1;
5762
5763			}
5764			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5765			stc.laddress[1] = 0;
5766			stc.laddress[2] = 0;
5767			stc.laddress[3] = 0;
5768			stc.laddr_type = SCTP_IPV4_ADDRESS;
5769			/* scope_id is only for v6 */
5770			stc.scope_id = 0;
5771			break;
5772#endif
5773#ifdef INET6
5774		case AF_INET6:
5775			sin6 = (struct sockaddr_in6 *)to;
5776			memcpy(&stc.address, &sin6->sin6_addr,
5777			    sizeof(struct in6_addr));
5778			stc.addr_type = SCTP_IPV6_ADDRESS;
5779			stc.scope_id = sin6->sin6_scope_id;
5780			if (net->src_addr_selected == 0) {
5781				/*
5782				 * strange case here, the INIT should have
5783				 * done the selection.
5784				 */
5785				net->ro._s_addr = sctp_source_address_selection(inp,
5786				    stcb, (sctp_route_t *) & net->ro,
5787				    net, 0, vrf_id);
5788				if (net->ro._s_addr == NULL)
5789					return;
5790
5791				net->src_addr_selected = 1;
5792			}
5793			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5794			    sizeof(struct in6_addr));
5795			stc.laddr_type = SCTP_IPV6_ADDRESS;
5796			break;
5797#endif
5798		}
5799	}
5800	/* Now lets put the SCTP header in place */
5801	initack = mtod(m, struct sctp_init_ack_chunk *);
5802	/* Save it off for quick ref */
5803	stc.peers_vtag = init_chk->init.initiate_tag;
5804	/* who are we */
5805	memcpy(stc.identification, SCTP_VERSION_STRING,
5806	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5807	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5808	/* now the chunk header */
5809	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5810	initack->ch.chunk_flags = 0;
5811	/* fill in later from mbuf we build */
5812	initack->ch.chunk_length = 0;
5813	/* place in my tag */
5814	if ((asoc != NULL) &&
5815	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5816	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5817	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5818		/* re-use the v-tags and init-seq here */
5819		initack->init.initiate_tag = htonl(asoc->my_vtag);
5820		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5821	} else {
5822		uint32_t vtag, itsn;
5823
5824		if (hold_inp_lock) {
5825			SCTP_INP_INCR_REF(inp);
5826			SCTP_INP_RUNLOCK(inp);
5827		}
5828		if (asoc) {
5829			atomic_add_int(&asoc->refcnt, 1);
5830			SCTP_TCB_UNLOCK(stcb);
5831	new_tag:
5832			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5833			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5834				/*
5835				 * Got a duplicate vtag on some guy behind a
5836				 * nat make sure we don't use it.
5837				 */
5838				goto new_tag;
5839			}
5840			initack->init.initiate_tag = htonl(vtag);
5841			/* get a TSN to use too */
5842			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5843			initack->init.initial_tsn = htonl(itsn);
5844			SCTP_TCB_LOCK(stcb);
5845			atomic_add_int(&asoc->refcnt, -1);
5846		} else {
5847			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5848			initack->init.initiate_tag = htonl(vtag);
5849			/* get a TSN to use too */
5850			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5851		}
5852		if (hold_inp_lock) {
5853			SCTP_INP_RLOCK(inp);
5854			SCTP_INP_DECR_REF(inp);
5855		}
5856	}
5857	/* save away my tag to */
5858	stc.my_vtag = initack->init.initiate_tag;
5859
5860	/* set up some of the credits. */
5861	so = inp->sctp_socket;
5862	if (so == NULL) {
5863		/* memory problem */
5864		sctp_m_freem(m);
5865		return;
5866	} else {
5867		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5868	}
5869	/* set what I want */
5870	his_limit = ntohs(init_chk->init.num_inbound_streams);
5871	/* choose what I want */
5872	if (asoc != NULL) {
5873		if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5874			i_want = asoc->streamoutcnt;
5875		} else {
5876			i_want = inp->sctp_ep.pre_open_stream_count;
5877		}
5878	} else {
5879		i_want = inp->sctp_ep.pre_open_stream_count;
5880	}
5881	if (his_limit < i_want) {
5882		/* I Want more :< */
5883		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5884	} else {
5885		/* I can have what I want :> */
5886		initack->init.num_outbound_streams = htons(i_want);
5887	}
5888	/* tell him his limit. */
5889	initack->init.num_inbound_streams =
5890	    htons(inp->sctp_ep.max_open_streams_intome);
5891
5892	/* adaptation layer indication parameter */
5893	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5894		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5895		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5896		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5897		ali->ph.param_length = htons(parameter_len);
5898		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5899		chunk_len += parameter_len;
5900	}
5901	/* ECN parameter */
5902	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5903	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5904		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5905		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5906		ph->param_type = htons(SCTP_ECN_CAPABLE);
5907		ph->param_length = htons(parameter_len);
5908		chunk_len += parameter_len;
5909	}
5910	/* PR-SCTP supported parameter */
5911	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5912	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5913		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5914		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5915		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5916		ph->param_length = htons(parameter_len);
5917		chunk_len += parameter_len;
5918	}
5919	/* Add NAT friendly parameter */
5920	if (nat_friendly) {
5921		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5922		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5923		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5924		ph->param_length = htons(parameter_len);
5925		chunk_len += parameter_len;
5926	}
5927	/* And now tell the peer which extensions we support */
5928	num_ext = 0;
5929	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5930	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5931	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5932		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5933	}
5934	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5935	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5936		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5937	}
5938	if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5939	    ((asoc == NULL) && (inp->asconf_supported == 1))) {
5940		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5941		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5942	}
5943	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5944	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5945		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5946	}
5947	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5948	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5949		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5950	}
5951	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5952	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5953		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5954	}
5955	if (num_ext > 0) {
5956		parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5957		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5958		pr_supported->ph.param_length = htons(parameter_len);
5959		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5960		chunk_len += parameter_len;
5961	}
5962	/* add authentication parameters */
5963	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5964	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5965		struct sctp_auth_random *randp;
5966		struct sctp_auth_hmac_algo *hmacs;
5967		struct sctp_auth_chunk_list *chunks;
5968
5969		if (padding_len > 0) {
5970			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5971			chunk_len += padding_len;
5972			padding_len = 0;
5973		}
5974		/* generate and add RANDOM parameter */
5975		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5976		parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5977		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5978		randp->ph.param_type = htons(SCTP_RANDOM);
5979		randp->ph.param_length = htons(parameter_len);
5980		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5981		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5982		chunk_len += parameter_len;
5983
5984		if (padding_len > 0) {
5985			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5986			chunk_len += padding_len;
5987			padding_len = 0;
5988		}
5989		/* add HMAC_ALGO parameter */
5990		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5991		parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5992		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5993		    (uint8_t *) hmacs->hmac_ids);
5994		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5995		hmacs->ph.param_length = htons(parameter_len);
5996		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5997		chunk_len += parameter_len;
5998
5999		if (padding_len > 0) {
6000			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6001			chunk_len += padding_len;
6002			padding_len = 0;
6003		}
6004		/* add CHUNKS parameter */
6005		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6006		parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6007		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6008		    chunks->chunk_types);
6009		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6010		chunks->ph.param_length = htons(parameter_len);
6011		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6012		chunk_len += parameter_len;
6013	}
6014	SCTP_BUF_LEN(m) = chunk_len;
6015	m_last = m;
6016	/* now the addresses */
6017	/*
6018	 * To optimize this we could put the scoping stuff into a structure
6019	 * and remove the individual uint8's from the stc structure. Then we
6020	 * could just sifa in the address within the stc.. but for now this
6021	 * is a quick hack to get the address stuff teased apart.
6022	 */
6023	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6024	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6025	scp.loopback_scope = stc.loopback_scope;
6026	scp.ipv4_local_scope = stc.ipv4_scope;
6027	scp.local_scope = stc.local_scope;
6028	scp.site_scope = stc.site_scope;
6029	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6030	    cnt_inits_to,
6031	    &padding_len, &chunk_len);
6032	/* padding_len can only be positive, if no addresses have been added */
6033	if (padding_len > 0) {
6034		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6035		chunk_len += padding_len;
6036		SCTP_BUF_LEN(m) += padding_len;
6037		padding_len = 0;
6038	}
6039	/* tack on the operational error if present */
6040	if (op_err) {
6041		parameter_len = 0;
6042		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6043			parameter_len += SCTP_BUF_LEN(m_tmp);
6044		}
6045		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6046		SCTP_BUF_NEXT(m_last) = op_err;
6047		while (SCTP_BUF_NEXT(m_last) != NULL) {
6048			m_last = SCTP_BUF_NEXT(m_last);
6049		}
6050		chunk_len += parameter_len;
6051	}
6052	if (padding_len > 0) {
6053		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6054		if (m_last == NULL) {
6055			/* Houston we have a problem, no space */
6056			sctp_m_freem(m);
6057			return;
6058		}
6059		chunk_len += padding_len;
6060		padding_len = 0;
6061	}
6062	/* Now we must build a cookie */
6063	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6064	if (m_cookie == NULL) {
6065		/* memory problem */
6066		sctp_m_freem(m);
6067		return;
6068	}
6069	/* Now append the cookie to the end and update the space/size */
6070	SCTP_BUF_NEXT(m_last) = m_cookie;
6071	parameter_len = 0;
6072	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6073		parameter_len += SCTP_BUF_LEN(m_tmp);
6074		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6075			m_last = m_tmp;
6076		}
6077	}
6078	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6079	chunk_len += parameter_len;
6080
6081	/*
6082	 * Place in the size, but we don't include the last pad (if any) in
6083	 * the INIT-ACK.
6084	 */
6085	initack->ch.chunk_length = htons(chunk_len);
6086
6087	/*
6088	 * Time to sign the cookie, we don't sign over the cookie signature
6089	 * though thus we set trailer.
6090	 */
6091	(void)sctp_hmac_m(SCTP_HMAC,
6092	    (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6093	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6094	    (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6095	/*
6096	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6097	 * here since the timer will drive a retranmission.
6098	 */
6099	if (padding_len > 0) {
6100		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6101			sctp_m_freem(m);
6102			return;
6103		}
6104	}
6105	if (stc.loopback_scope) {
6106		over_addr = (union sctp_sockstore *)dst;
6107	} else {
6108		over_addr = NULL;
6109	}
6110
6111	(void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6112	    0, 0,
6113	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6114	    port, over_addr,
6115	    use_mflowid, mflowid,
6116	    SCTP_SO_NOT_LOCKED);
6117	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6118}
6119
6120
6121static void
6122sctp_prune_prsctp(struct sctp_tcb *stcb,
6123    struct sctp_association *asoc,
6124    struct sctp_sndrcvinfo *srcv,
6125    int dataout)
6126{
6127	int freed_spc = 0;
6128	struct sctp_tmit_chunk *chk, *nchk;
6129
6130	SCTP_TCB_LOCK_ASSERT(stcb);
6131	if ((asoc->prsctp_supported) &&
6132	    (asoc->sent_queue_cnt_removeable > 0)) {
6133		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6134			/*
6135			 * Look for chunks marked with the PR_SCTP flag AND
6136			 * the buffer space flag. If the one being sent is
6137			 * equal or greater priority then purge the old one
6138			 * and free some space.
6139			 */
6140			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6141				/*
6142				 * This one is PR-SCTP AND buffer space
6143				 * limited type
6144				 */
6145				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6146					/*
6147					 * Lower numbers equates to higher
6148					 * priority so if the one we are
6149					 * looking at has a larger or equal
6150					 * priority we want to drop the data
6151					 * and NOT retransmit it.
6152					 */
6153					if (chk->data) {
6154						/*
6155						 * We release the book_size
6156						 * if the mbuf is here
6157						 */
6158						int ret_spc;
6159						uint8_t sent;
6160
6161						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6162							sent = 1;
6163						else
6164							sent = 0;
6165						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6166						    sent,
6167						    SCTP_SO_LOCKED);
6168						freed_spc += ret_spc;
6169						if (freed_spc >= dataout) {
6170							return;
6171						}
6172					}	/* if chunk was present */
6173				}	/* if of sufficent priority */
6174			}	/* if chunk has enabled */
6175		}		/* tailqforeach */
6176
6177		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6178			/* Here we must move to the sent queue and mark */
6179			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6180				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6181					if (chk->data) {
6182						/*
6183						 * We release the book_size
6184						 * if the mbuf is here
6185						 */
6186						int ret_spc;
6187
6188						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6189						    0, SCTP_SO_LOCKED);
6190
6191						freed_spc += ret_spc;
6192						if (freed_spc >= dataout) {
6193							return;
6194						}
6195					}	/* end if chk->data */
6196				}	/* end if right class */
6197			}	/* end if chk pr-sctp */
6198		}		/* tailqforeachsafe (chk) */
6199	}			/* if enabled in asoc */
6200}
6201
6202int
6203sctp_get_frag_point(struct sctp_tcb *stcb,
6204    struct sctp_association *asoc)
6205{
6206	int siz, ovh;
6207
6208	/*
6209	 * For endpoints that have both v6 and v4 addresses we must reserve
6210	 * room for the ipv6 header, for those that are only dealing with V4
6211	 * we use a larger frag point.
6212	 */
6213	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6214		ovh = SCTP_MED_OVERHEAD;
6215	} else {
6216		ovh = SCTP_MED_V4_OVERHEAD;
6217	}
6218
6219	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6220		siz = asoc->smallest_mtu - ovh;
6221	else
6222		siz = (stcb->asoc.sctp_frag_point - ovh);
6223	/*
6224	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6225	 */
6226	/* A data chunk MUST fit in a cluster */
6227	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6228	/* } */
6229
6230	/* adjust for an AUTH chunk if DATA requires auth */
6231	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6232		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6233
6234	if (siz % 4) {
6235		/* make it an even word boundary please */
6236		siz -= (siz % 4);
6237	}
6238	return (siz);
6239}
6240
6241static void
6242sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6243{
6244	/*
6245	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6246	 * positive lifetime but does not specify any PR_SCTP policy.
6247	 */
6248	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6249		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6250	} else if (sp->timetolive > 0) {
6251		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6252		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6253	} else {
6254		return;
6255	}
6256	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6257	case CHUNK_FLAGS_PR_SCTP_BUF:
6258		/*
6259		 * Time to live is a priority stored in tv_sec when doing
6260		 * the buffer drop thing.
6261		 */
6262		sp->ts.tv_sec = sp->timetolive;
6263		sp->ts.tv_usec = 0;
6264		break;
6265	case CHUNK_FLAGS_PR_SCTP_TTL:
6266		{
6267			struct timeval tv;
6268
6269			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6270			tv.tv_sec = sp->timetolive / 1000;
6271			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6272			/*
6273			 * TODO sctp_constants.h needs alternative time
6274			 * macros when _KERNEL is undefined.
6275			 */
6276			timevaladd(&sp->ts, &tv);
6277		}
6278		break;
6279	case CHUNK_FLAGS_PR_SCTP_RTX:
6280		/*
6281		 * Time to live is a the number or retransmissions stored in
6282		 * tv_sec.
6283		 */
6284		sp->ts.tv_sec = sp->timetolive;
6285		sp->ts.tv_usec = 0;
6286		break;
6287	default:
6288		SCTPDBG(SCTP_DEBUG_USRREQ1,
6289		    "Unknown PR_SCTP policy %u.\n",
6290		    PR_SCTP_POLICY(sp->sinfo_flags));
6291		break;
6292	}
6293}
6294
6295static int
6296sctp_msg_append(struct sctp_tcb *stcb,
6297    struct sctp_nets *net,
6298    struct mbuf *m,
6299    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6300{
6301	int error = 0;
6302	struct mbuf *at;
6303	struct sctp_stream_queue_pending *sp = NULL;
6304	struct sctp_stream_out *strm;
6305
6306	/*
6307	 * Given an mbuf chain, put it into the association send queue and
6308	 * place it on the wheel
6309	 */
6310	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6311		/* Invalid stream number */
6312		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6313		error = EINVAL;
6314		goto out_now;
6315	}
6316	if ((stcb->asoc.stream_locked) &&
6317	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6318		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6319		error = EINVAL;
6320		goto out_now;
6321	}
6322	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6323	/* Now can we send this? */
6324	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6325	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6326	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6327	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6328		/* got data while shutting down */
6329		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6330		error = ECONNRESET;
6331		goto out_now;
6332	}
6333	sctp_alloc_a_strmoq(stcb, sp);
6334	if (sp == NULL) {
6335		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6336		error = ENOMEM;
6337		goto out_now;
6338	}
6339	sp->sinfo_flags = srcv->sinfo_flags;
6340	sp->timetolive = srcv->sinfo_timetolive;
6341	sp->ppid = srcv->sinfo_ppid;
6342	sp->context = srcv->sinfo_context;
6343	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6344		sp->net = net;
6345		atomic_add_int(&sp->net->ref_count, 1);
6346	} else {
6347		sp->net = NULL;
6348	}
6349	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6350	sp->stream = srcv->sinfo_stream;
6351	sp->msg_is_complete = 1;
6352	sp->sender_all_done = 1;
6353	sp->some_taken = 0;
6354	sp->data = m;
6355	sp->tail_mbuf = NULL;
6356	sctp_set_prsctp_policy(sp);
6357	/*
6358	 * We could in theory (for sendall) sifa the length in, but we would
6359	 * still have to hunt through the chain since we need to setup the
6360	 * tail_mbuf
6361	 */
6362	sp->length = 0;
6363	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6364		if (SCTP_BUF_NEXT(at) == NULL)
6365			sp->tail_mbuf = at;
6366		sp->length += SCTP_BUF_LEN(at);
6367	}
6368	if (srcv->sinfo_keynumber_valid) {
6369		sp->auth_keyid = srcv->sinfo_keynumber;
6370	} else {
6371		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6372	}
6373	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6374		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6375		sp->holds_key_ref = 1;
6376	}
6377	if (hold_stcb_lock == 0) {
6378		SCTP_TCB_SEND_LOCK(stcb);
6379	}
6380	sctp_snd_sb_alloc(stcb, sp->length);
6381	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6382	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6383	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6384	m = NULL;
6385	if (hold_stcb_lock == 0) {
6386		SCTP_TCB_SEND_UNLOCK(stcb);
6387	}
6388out_now:
6389	if (m) {
6390		sctp_m_freem(m);
6391	}
6392	return (error);
6393}
6394
6395
6396static struct mbuf *
6397sctp_copy_mbufchain(struct mbuf *clonechain,
6398    struct mbuf *outchain,
6399    struct mbuf **endofchain,
6400    int can_take_mbuf,
6401    int sizeofcpy,
6402    uint8_t copy_by_ref)
6403{
6404	struct mbuf *m;
6405	struct mbuf *appendchain;
6406	caddr_t cp;
6407	int len;
6408
6409	if (endofchain == NULL) {
6410		/* error */
6411error_out:
6412		if (outchain)
6413			sctp_m_freem(outchain);
6414		return (NULL);
6415	}
6416	if (can_take_mbuf) {
6417		appendchain = clonechain;
6418	} else {
6419		if (!copy_by_ref &&
6420		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6421		    ) {
6422			/* Its not in a cluster */
6423			if (*endofchain == NULL) {
6424				/* lets get a mbuf cluster */
6425				if (outchain == NULL) {
6426					/* This is the general case */
6427			new_mbuf:
6428					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6429					if (outchain == NULL) {
6430						goto error_out;
6431					}
6432					SCTP_BUF_LEN(outchain) = 0;
6433					*endofchain = outchain;
6434					/* get the prepend space */
6435					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6436				} else {
6437					/*
6438					 * We really should not get a NULL
6439					 * in endofchain
6440					 */
6441					/* find end */
6442					m = outchain;
6443					while (m) {
6444						if (SCTP_BUF_NEXT(m) == NULL) {
6445							*endofchain = m;
6446							break;
6447						}
6448						m = SCTP_BUF_NEXT(m);
6449					}
6450					/* sanity */
6451					if (*endofchain == NULL) {
6452						/*
6453						 * huh, TSNH XXX maybe we
6454						 * should panic
6455						 */
6456						sctp_m_freem(outchain);
6457						goto new_mbuf;
6458					}
6459				}
6460				/* get the new end of length */
6461				len = M_TRAILINGSPACE(*endofchain);
6462			} else {
6463				/* how much is left at the end? */
6464				len = M_TRAILINGSPACE(*endofchain);
6465			}
6466			/* Find the end of the data, for appending */
6467			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6468
6469			/* Now lets copy it out */
6470			if (len >= sizeofcpy) {
6471				/* It all fits, copy it in */
6472				m_copydata(clonechain, 0, sizeofcpy, cp);
6473				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6474			} else {
6475				/* fill up the end of the chain */
6476				if (len > 0) {
6477					m_copydata(clonechain, 0, len, cp);
6478					SCTP_BUF_LEN((*endofchain)) += len;
6479					/* now we need another one */
6480					sizeofcpy -= len;
6481				}
6482				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6483				if (m == NULL) {
6484					/* We failed */
6485					goto error_out;
6486				}
6487				SCTP_BUF_NEXT((*endofchain)) = m;
6488				*endofchain = m;
6489				cp = mtod((*endofchain), caddr_t);
6490				m_copydata(clonechain, len, sizeofcpy, cp);
6491				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6492			}
6493			return (outchain);
6494		} else {
6495			/* copy the old fashion way */
6496			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6497#ifdef SCTP_MBUF_LOGGING
6498			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6499				struct mbuf *mat;
6500
6501				for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6502					if (SCTP_BUF_IS_EXTENDED(mat)) {
6503						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6504					}
6505				}
6506			}
6507#endif
6508		}
6509	}
6510	if (appendchain == NULL) {
6511		/* error */
6512		if (outchain)
6513			sctp_m_freem(outchain);
6514		return (NULL);
6515	}
6516	if (outchain) {
6517		/* tack on to the end */
6518		if (*endofchain != NULL) {
6519			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6520		} else {
6521			m = outchain;
6522			while (m) {
6523				if (SCTP_BUF_NEXT(m) == NULL) {
6524					SCTP_BUF_NEXT(m) = appendchain;
6525					break;
6526				}
6527				m = SCTP_BUF_NEXT(m);
6528			}
6529		}
6530		/*
6531		 * save off the end and update the end-chain postion
6532		 */
6533		m = appendchain;
6534		while (m) {
6535			if (SCTP_BUF_NEXT(m) == NULL) {
6536				*endofchain = m;
6537				break;
6538			}
6539			m = SCTP_BUF_NEXT(m);
6540		}
6541		return (outchain);
6542	} else {
6543		/* save off the end and update the end-chain postion */
6544		m = appendchain;
6545		while (m) {
6546			if (SCTP_BUF_NEXT(m) == NULL) {
6547				*endofchain = m;
6548				break;
6549			}
6550			m = SCTP_BUF_NEXT(m);
6551		}
6552		return (appendchain);
6553	}
6554}
6555
6556static int
6557sctp_med_chunk_output(struct sctp_inpcb *inp,
6558    struct sctp_tcb *stcb,
6559    struct sctp_association *asoc,
6560    int *num_out,
6561    int *reason_code,
6562    int control_only, int from_where,
6563    struct timeval *now, int *now_filled, int frag_point, int so_locked
6564#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6565    SCTP_UNUSED
6566#endif
6567);
6568
6569static void
6570sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6571    uint32_t val SCTP_UNUSED)
6572{
6573	struct sctp_copy_all *ca;
6574	struct mbuf *m;
6575	int ret = 0;
6576	int added_control = 0;
6577	int un_sent, do_chunk_output = 1;
6578	struct sctp_association *asoc;
6579	struct sctp_nets *net;
6580
6581	ca = (struct sctp_copy_all *)ptr;
6582	if (ca->m == NULL) {
6583		return;
6584	}
6585	if (ca->inp != inp) {
6586		/* TSNH */
6587		return;
6588	}
6589	if (ca->sndlen > 0) {
6590		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6591		if (m == NULL) {
6592			/* can't copy so we are done */
6593			ca->cnt_failed++;
6594			return;
6595		}
6596#ifdef SCTP_MBUF_LOGGING
6597		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6598			struct mbuf *mat;
6599
6600			for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6601				if (SCTP_BUF_IS_EXTENDED(mat)) {
6602					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6603				}
6604			}
6605		}
6606#endif
6607	} else {
6608		m = NULL;
6609	}
6610	SCTP_TCB_LOCK_ASSERT(stcb);
6611	if (stcb->asoc.alternate) {
6612		net = stcb->asoc.alternate;
6613	} else {
6614		net = stcb->asoc.primary_destination;
6615	}
6616	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6617		/* Abort this assoc with m as the user defined reason */
6618		if (m != NULL) {
6619			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6620		} else {
6621			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6622			    0, M_NOWAIT, 1, MT_DATA);
6623			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6624		}
6625		if (m != NULL) {
6626			struct sctp_paramhdr *ph;
6627
6628			ph = mtod(m, struct sctp_paramhdr *);
6629			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6630			ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6631		}
6632		/*
6633		 * We add one here to keep the assoc from dis-appearing on
6634		 * us.
6635		 */
6636		atomic_add_int(&stcb->asoc.refcnt, 1);
6637		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6638		/*
6639		 * sctp_abort_an_association calls sctp_free_asoc() free
6640		 * association will NOT free it since we incremented the
6641		 * refcnt .. we do this to prevent it being freed and things
6642		 * getting tricky since we could end up (from free_asoc)
6643		 * calling inpcb_free which would get a recursive lock call
6644		 * to the iterator lock.. But as a consequence of that the
6645		 * stcb will return to us un-locked.. since free_asoc
6646		 * returns with either no TCB or the TCB unlocked, we must
6647		 * relock.. to unlock in the iterator timer :-0
6648		 */
6649		SCTP_TCB_LOCK(stcb);
6650		atomic_add_int(&stcb->asoc.refcnt, -1);
6651		goto no_chunk_output;
6652	} else {
6653		if (m) {
6654			ret = sctp_msg_append(stcb, net, m,
6655			    &ca->sndrcv, 1);
6656		}
6657		asoc = &stcb->asoc;
6658		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6659			/* shutdown this assoc */
6660			int cnt;
6661
6662			cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6663
6664			if (TAILQ_EMPTY(&asoc->send_queue) &&
6665			    TAILQ_EMPTY(&asoc->sent_queue) &&
6666			    (cnt == 0)) {
6667				if (asoc->locked_on_sending) {
6668					goto abort_anyway;
6669				}
6670				/*
6671				 * there is nothing queued to send, so I'm
6672				 * done...
6673				 */
6674				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6675				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6676				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6677					/*
6678					 * only send SHUTDOWN the first time
6679					 * through
6680					 */
6681					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6682						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6683					}
6684					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6685					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6686					sctp_stop_timers_for_shutdown(stcb);
6687					sctp_send_shutdown(stcb, net);
6688					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6689					    net);
6690					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6691					    asoc->primary_destination);
6692					added_control = 1;
6693					do_chunk_output = 0;
6694				}
6695			} else {
6696				/*
6697				 * we still got (or just got) data to send,
6698				 * so set SHUTDOWN_PENDING
6699				 */
6700				/*
6701				 * XXX sockets draft says that SCTP_EOF
6702				 * should be sent with no data.  currently,
6703				 * we will allow user data to be sent first
6704				 * and move to SHUTDOWN-PENDING
6705				 */
6706				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6707				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6708				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6709					if (asoc->locked_on_sending) {
6710						/*
6711						 * Locked to send out the
6712						 * data
6713						 */
6714						struct sctp_stream_queue_pending *sp;
6715
6716						sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6717						if (sp) {
6718							if ((sp->length == 0) && (sp->msg_is_complete == 0))
6719								asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6720						}
6721					}
6722					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6723					if (TAILQ_EMPTY(&asoc->send_queue) &&
6724					    TAILQ_EMPTY(&asoc->sent_queue) &&
6725					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6726				abort_anyway:
6727						atomic_add_int(&stcb->asoc.refcnt, 1);
6728						sctp_abort_an_association(stcb->sctp_ep, stcb,
6729						    NULL, SCTP_SO_NOT_LOCKED);
6730						atomic_add_int(&stcb->asoc.refcnt, -1);
6731						goto no_chunk_output;
6732					}
6733					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6734					    asoc->primary_destination);
6735				}
6736			}
6737
6738		}
6739	}
6740	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6741	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6742
6743	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6744	    (stcb->asoc.total_flight > 0) &&
6745	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6746		do_chunk_output = 0;
6747	}
6748	if (do_chunk_output)
6749		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6750	else if (added_control) {
6751		int num_out = 0, reason = 0, now_filled = 0;
6752		struct timeval now;
6753		int frag_point;
6754
6755		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6756		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6757		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6758	}
6759no_chunk_output:
6760	if (ret) {
6761		ca->cnt_failed++;
6762	} else {
6763		ca->cnt_sent++;
6764	}
6765}
6766
6767static void
6768sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6769{
6770	struct sctp_copy_all *ca;
6771
6772	ca = (struct sctp_copy_all *)ptr;
6773	/*
6774	 * Do a notify here? Kacheong suggests that the notify be done at
6775	 * the send time.. so you would push up a notification if any send
6776	 * failed. Don't know if this is feasable since the only failures we
6777	 * have is "memory" related and if you cannot get an mbuf to send
6778	 * the data you surely can't get an mbuf to send up to notify the
6779	 * user you can't send the data :->
6780	 */
6781
6782	/* now free everything */
6783	sctp_m_freem(ca->m);
6784	SCTP_FREE(ca, SCTP_M_COPYAL);
6785}
6786
6787static struct mbuf *
6788sctp_copy_out_all(struct uio *uio, int len)
6789{
6790	struct mbuf *ret, *at;
6791	int left, willcpy, cancpy, error;
6792
6793	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6794	if (ret == NULL) {
6795		/* TSNH */
6796		return (NULL);
6797	}
6798	left = len;
6799	SCTP_BUF_LEN(ret) = 0;
6800	/* save space for the data chunk header */
6801	cancpy = M_TRAILINGSPACE(ret);
6802	willcpy = min(cancpy, left);
6803	at = ret;
6804	while (left > 0) {
6805		/* Align data to the end */
6806		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6807		if (error) {
6808	err_out_now:
6809			sctp_m_freem(at);
6810			return (NULL);
6811		}
6812		SCTP_BUF_LEN(at) = willcpy;
6813		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6814		left -= willcpy;
6815		if (left > 0) {
6816			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6817			if (SCTP_BUF_NEXT(at) == NULL) {
6818				goto err_out_now;
6819			}
6820			at = SCTP_BUF_NEXT(at);
6821			SCTP_BUF_LEN(at) = 0;
6822			cancpy = M_TRAILINGSPACE(at);
6823			willcpy = min(cancpy, left);
6824		}
6825	}
6826	return (ret);
6827}
6828
6829static int
6830sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6831    struct sctp_sndrcvinfo *srcv)
6832{
6833	int ret;
6834	struct sctp_copy_all *ca;
6835
6836	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6837	    SCTP_M_COPYAL);
6838	if (ca == NULL) {
6839		sctp_m_freem(m);
6840		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6841		return (ENOMEM);
6842	}
6843	memset(ca, 0, sizeof(struct sctp_copy_all));
6844
6845	ca->inp = inp;
6846	if (srcv) {
6847		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6848	}
6849	/*
6850	 * take off the sendall flag, it would be bad if we failed to do
6851	 * this :-0
6852	 */
6853	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6854	/* get length and mbuf chain */
6855	if (uio) {
6856		ca->sndlen = uio->uio_resid;
6857		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6858		if (ca->m == NULL) {
6859			SCTP_FREE(ca, SCTP_M_COPYAL);
6860			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6861			return (ENOMEM);
6862		}
6863	} else {
6864		/* Gather the length of the send */
6865		struct mbuf *mat;
6866
6867		ca->sndlen = 0;
6868		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6869			ca->sndlen += SCTP_BUF_LEN(mat);
6870		}
6871	}
6872	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6873	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6874	    SCTP_ASOC_ANY_STATE,
6875	    (void *)ca, 0,
6876	    sctp_sendall_completes, inp, 1);
6877	if (ret) {
6878		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6879		SCTP_FREE(ca, SCTP_M_COPYAL);
6880		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6881		return (EFAULT);
6882	}
6883	return (0);
6884}
6885
6886
6887void
6888sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6889{
6890	struct sctp_tmit_chunk *chk, *nchk;
6891
6892	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6893		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6894			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6895			if (chk->data) {
6896				sctp_m_freem(chk->data);
6897				chk->data = NULL;
6898			}
6899			asoc->ctrl_queue_cnt--;
6900			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6901		}
6902	}
6903}
6904
6905void
6906sctp_toss_old_asconf(struct sctp_tcb *stcb)
6907{
6908	struct sctp_association *asoc;
6909	struct sctp_tmit_chunk *chk, *nchk;
6910	struct sctp_asconf_chunk *acp;
6911
6912	asoc = &stcb->asoc;
6913	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6914		/* find SCTP_ASCONF chunk in queue */
6915		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6916			if (chk->data) {
6917				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6918				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6919					/* Not Acked yet */
6920					break;
6921				}
6922			}
6923			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6924			if (chk->data) {
6925				sctp_m_freem(chk->data);
6926				chk->data = NULL;
6927			}
6928			asoc->ctrl_queue_cnt--;
6929			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6930		}
6931	}
6932}
6933
6934
6935static void
6936sctp_clean_up_datalist(struct sctp_tcb *stcb,
6937    struct sctp_association *asoc,
6938    struct sctp_tmit_chunk **data_list,
6939    int bundle_at,
6940    struct sctp_nets *net)
6941{
6942	int i;
6943	struct sctp_tmit_chunk *tp1;
6944
6945	for (i = 0; i < bundle_at; i++) {
6946		/* off of the send queue */
6947		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6948		asoc->send_queue_cnt--;
6949		if (i > 0) {
6950			/*
6951			 * Any chunk NOT 0 you zap the time chunk 0 gets
6952			 * zapped or set based on if a RTO measurment is
6953			 * needed.
6954			 */
6955			data_list[i]->do_rtt = 0;
6956		}
6957		/* record time */
6958		data_list[i]->sent_rcv_time = net->last_sent_time;
6959		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6960		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6961		if (data_list[i]->whoTo == NULL) {
6962			data_list[i]->whoTo = net;
6963			atomic_add_int(&net->ref_count, 1);
6964		}
6965		/* on to the sent queue */
6966		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6967		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6968			struct sctp_tmit_chunk *tpp;
6969
6970			/* need to move back */
6971	back_up_more:
6972			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6973			if (tpp == NULL) {
6974				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6975				goto all_done;
6976			}
6977			tp1 = tpp;
6978			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6979				goto back_up_more;
6980			}
6981			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6982		} else {
6983			TAILQ_INSERT_TAIL(&asoc->sent_queue,
6984			    data_list[i],
6985			    sctp_next);
6986		}
6987all_done:
6988		/* This does not lower until the cum-ack passes it */
6989		asoc->sent_queue_cnt++;
6990		if ((asoc->peers_rwnd <= 0) &&
6991		    (asoc->total_flight == 0) &&
6992		    (bundle_at == 1)) {
6993			/* Mark the chunk as being a window probe */
6994			SCTP_STAT_INCR(sctps_windowprobed);
6995		}
6996#ifdef SCTP_AUDITING_ENABLED
6997		sctp_audit_log(0xC2, 3);
6998#endif
6999		data_list[i]->sent = SCTP_DATAGRAM_SENT;
7000		data_list[i]->snd_count = 1;
7001		data_list[i]->rec.data.chunk_was_revoked = 0;
7002		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7003			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7004			    data_list[i]->whoTo->flight_size,
7005			    data_list[i]->book_size,
7006			    (uintptr_t) data_list[i]->whoTo,
7007			    data_list[i]->rec.data.TSN_seq);
7008		}
7009		sctp_flight_size_increase(data_list[i]);
7010		sctp_total_flight_increase(stcb, data_list[i]);
7011		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7012			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7013			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7014		}
7015		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7016		    (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7017		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7018			/* SWS sender side engages */
7019			asoc->peers_rwnd = 0;
7020		}
7021	}
7022	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7023		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7024	}
7025}
7026
7027static void
7028sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7029#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7030    SCTP_UNUSED
7031#endif
7032)
7033{
7034	struct sctp_tmit_chunk *chk, *nchk;
7035
7036	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7037		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7038		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7039		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7040		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7041		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7042		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7043		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7044		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7045		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7046		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7047		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7048		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7049			/* Stray chunks must be cleaned up */
7050	clean_up_anyway:
7051			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7052			if (chk->data) {
7053				sctp_m_freem(chk->data);
7054				chk->data = NULL;
7055			}
7056			asoc->ctrl_queue_cnt--;
7057			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7058				asoc->fwd_tsn_cnt--;
7059			sctp_free_a_chunk(stcb, chk, so_locked);
7060		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7061			/* special handling, we must look into the param */
7062			if (chk != asoc->str_reset) {
7063				goto clean_up_anyway;
7064			}
7065		}
7066	}
7067}
7068
7069
7070static int
7071sctp_can_we_split_this(struct sctp_tcb *stcb,
7072    uint32_t length,
7073    uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7074{
7075	/*
7076	 * Make a decision on if I should split a msg into multiple parts.
7077	 * This is only asked of incomplete messages.
7078	 */
7079	if (eeor_on) {
7080		/*
7081		 * If we are doing EEOR we need to always send it if its the
7082		 * entire thing, since it might be all the guy is putting in
7083		 * the hopper.
7084		 */
7085		if (goal_mtu >= length) {
7086			/*-
7087			 * If we have data outstanding,
7088			 * we get another chance when the sack
7089			 * arrives to transmit - wait for more data
7090			 */
7091			if (stcb->asoc.total_flight == 0) {
7092				/*
7093				 * If nothing is in flight, we zero the
7094				 * packet counter.
7095				 */
7096				return (length);
7097			}
7098			return (0);
7099
7100		} else {
7101			/* You can fill the rest */
7102			return (goal_mtu);
7103		}
7104	}
7105	/*-
7106	 * For those strange folk that make the send buffer
7107	 * smaller than our fragmentation point, we can't
7108	 * get a full msg in so we have to allow splitting.
7109	 */
7110	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7111		return (length);
7112	}
7113	if ((length <= goal_mtu) ||
7114	    ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7115		/* Sub-optimial residual don't split in non-eeor mode. */
7116		return (0);
7117	}
7118	/*
7119	 * If we reach here length is larger than the goal_mtu. Do we wish
7120	 * to split it for the sake of packet putting together?
7121	 */
7122	if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7123		/* Its ok to split it */
7124		return (min(goal_mtu, frag_point));
7125	}
7126	/* Nope, can't split */
7127	return (0);
7128
7129}
7130
7131static uint32_t
7132sctp_move_to_outqueue(struct sctp_tcb *stcb,
7133    struct sctp_stream_out *strq,
7134    uint32_t goal_mtu,
7135    uint32_t frag_point,
7136    int *locked,
7137    int *giveup,
7138    int eeor_mode,
7139    int *bail,
7140    int so_locked
7141#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7142    SCTP_UNUSED
7143#endif
7144)
7145{
7146	/* Move from the stream to the send_queue keeping track of the total */
7147	struct sctp_association *asoc;
7148	struct sctp_stream_queue_pending *sp;
7149	struct sctp_tmit_chunk *chk;
7150	struct sctp_data_chunk *dchkh;
7151	uint32_t to_move, length;
7152	uint8_t rcv_flags = 0;
7153	uint8_t some_taken;
7154	uint8_t send_lock_up = 0;
7155
7156	SCTP_TCB_LOCK_ASSERT(stcb);
7157	asoc = &stcb->asoc;
7158one_more_time:
7159	/* sa_ignore FREED_MEMORY */
7160	sp = TAILQ_FIRST(&strq->outqueue);
7161	if (sp == NULL) {
7162		*locked = 0;
7163		if (send_lock_up == 0) {
7164			SCTP_TCB_SEND_LOCK(stcb);
7165			send_lock_up = 1;
7166		}
7167		sp = TAILQ_FIRST(&strq->outqueue);
7168		if (sp) {
7169			goto one_more_time;
7170		}
7171		if (strq->last_msg_incomplete) {
7172			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7173			    strq->stream_no,
7174			    strq->last_msg_incomplete);
7175			strq->last_msg_incomplete = 0;
7176		}
7177		to_move = 0;
7178		if (send_lock_up) {
7179			SCTP_TCB_SEND_UNLOCK(stcb);
7180			send_lock_up = 0;
7181		}
7182		goto out_of;
7183	}
7184	if ((sp->msg_is_complete) && (sp->length == 0)) {
7185		if (sp->sender_all_done) {
7186			/*
7187			 * We are doing differed cleanup. Last time through
7188			 * when we took all the data the sender_all_done was
7189			 * not set.
7190			 */
7191			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7192				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7193				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7194				    sp->sender_all_done,
7195				    sp->length,
7196				    sp->msg_is_complete,
7197				    sp->put_last_out,
7198				    send_lock_up);
7199			}
7200			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7201				SCTP_TCB_SEND_LOCK(stcb);
7202				send_lock_up = 1;
7203			}
7204			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7205			TAILQ_REMOVE(&strq->outqueue, sp, next);
7206			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7207			if (sp->net) {
7208				sctp_free_remote_addr(sp->net);
7209				sp->net = NULL;
7210			}
7211			if (sp->data) {
7212				sctp_m_freem(sp->data);
7213				sp->data = NULL;
7214			}
7215			sctp_free_a_strmoq(stcb, sp, so_locked);
7216			/* we can't be locked to it */
7217			*locked = 0;
7218			stcb->asoc.locked_on_sending = NULL;
7219			if (send_lock_up) {
7220				SCTP_TCB_SEND_UNLOCK(stcb);
7221				send_lock_up = 0;
7222			}
7223			/* back to get the next msg */
7224			goto one_more_time;
7225		} else {
7226			/*
7227			 * sender just finished this but still holds a
7228			 * reference
7229			 */
7230			*locked = 1;
7231			*giveup = 1;
7232			to_move = 0;
7233			goto out_of;
7234		}
7235	} else {
7236		/* is there some to get */
7237		if (sp->length == 0) {
7238			/* no */
7239			*locked = 1;
7240			*giveup = 1;
7241			to_move = 0;
7242			goto out_of;
7243		} else if (sp->discard_rest) {
7244			if (send_lock_up == 0) {
7245				SCTP_TCB_SEND_LOCK(stcb);
7246				send_lock_up = 1;
7247			}
7248			/* Whack down the size */
7249			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7250			if ((stcb->sctp_socket != NULL) && \
7251			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7252			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7253				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7254			}
7255			if (sp->data) {
7256				sctp_m_freem(sp->data);
7257				sp->data = NULL;
7258				sp->tail_mbuf = NULL;
7259			}
7260			sp->length = 0;
7261			sp->some_taken = 1;
7262			*locked = 1;
7263			*giveup = 1;
7264			to_move = 0;
7265			goto out_of;
7266		}
7267	}
7268	some_taken = sp->some_taken;
7269	if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7270		sp->msg_is_complete = 1;
7271	}
7272re_look:
7273	length = sp->length;
7274	if (sp->msg_is_complete) {
7275		/* The message is complete */
7276		to_move = min(length, frag_point);
7277		if (to_move == length) {
7278			/* All of it fits in the MTU */
7279			if (sp->some_taken) {
7280				rcv_flags |= SCTP_DATA_LAST_FRAG;
7281				sp->put_last_out = 1;
7282			} else {
7283				rcv_flags |= SCTP_DATA_NOT_FRAG;
7284				sp->put_last_out = 1;
7285			}
7286		} else {
7287			/* Not all of it fits, we fragment */
7288			if (sp->some_taken == 0) {
7289				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7290			}
7291			sp->some_taken = 1;
7292		}
7293	} else {
7294		to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7295		if (to_move) {
7296			/*-
7297			 * We use a snapshot of length in case it
7298			 * is expanding during the compare.
7299			 */
7300			uint32_t llen;
7301
7302			llen = length;
7303			if (to_move >= llen) {
7304				to_move = llen;
7305				if (send_lock_up == 0) {
7306					/*-
7307					 * We are taking all of an incomplete msg
7308					 * thus we need a send lock.
7309					 */
7310					SCTP_TCB_SEND_LOCK(stcb);
7311					send_lock_up = 1;
7312					if (sp->msg_is_complete) {
7313						/*
7314						 * the sender finished the
7315						 * msg
7316						 */
7317						goto re_look;
7318					}
7319				}
7320			}
7321			if (sp->some_taken == 0) {
7322				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7323				sp->some_taken = 1;
7324			}
7325		} else {
7326			/* Nothing to take. */
7327			if (sp->some_taken) {
7328				*locked = 1;
7329			}
7330			*giveup = 1;
7331			to_move = 0;
7332			goto out_of;
7333		}
7334	}
7335
7336	/* If we reach here, we can copy out a chunk */
7337	sctp_alloc_a_chunk(stcb, chk);
7338	if (chk == NULL) {
7339		/* No chunk memory */
7340		*giveup = 1;
7341		to_move = 0;
7342		goto out_of;
7343	}
7344	/*
7345	 * Setup for unordered if needed by looking at the user sent info
7346	 * flags.
7347	 */
7348	if (sp->sinfo_flags & SCTP_UNORDERED) {
7349		rcv_flags |= SCTP_DATA_UNORDERED;
7350	}
7351	if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7352	    ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7353		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7354	}
7355	/* clear out the chunk before setting up */
7356	memset(chk, 0, sizeof(*chk));
7357	chk->rec.data.rcv_flags = rcv_flags;
7358
7359	if (to_move >= length) {
7360		/* we think we can steal the whole thing */
7361		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7362			SCTP_TCB_SEND_LOCK(stcb);
7363			send_lock_up = 1;
7364		}
7365		if (to_move < sp->length) {
7366			/* bail, it changed */
7367			goto dont_do_it;
7368		}
7369		chk->data = sp->data;
7370		chk->last_mbuf = sp->tail_mbuf;
7371		/* register the stealing */
7372		sp->data = sp->tail_mbuf = NULL;
7373	} else {
7374		struct mbuf *m;
7375
7376dont_do_it:
7377		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7378		chk->last_mbuf = NULL;
7379		if (chk->data == NULL) {
7380			sp->some_taken = some_taken;
7381			sctp_free_a_chunk(stcb, chk, so_locked);
7382			*bail = 1;
7383			to_move = 0;
7384			goto out_of;
7385		}
7386#ifdef SCTP_MBUF_LOGGING
7387		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7388			struct mbuf *mat;
7389
7390			for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7391				if (SCTP_BUF_IS_EXTENDED(mat)) {
7392					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7393				}
7394			}
7395		}
7396#endif
7397		/* Pull off the data */
7398		m_adj(sp->data, to_move);
7399		/* Now lets work our way down and compact it */
7400		m = sp->data;
7401		while (m && (SCTP_BUF_LEN(m) == 0)) {
7402			sp->data = SCTP_BUF_NEXT(m);
7403			SCTP_BUF_NEXT(m) = NULL;
7404			if (sp->tail_mbuf == m) {
7405				/*-
7406				 * Freeing tail? TSNH since
7407				 * we supposedly were taking less
7408				 * than the sp->length.
7409				 */
7410#ifdef INVARIANTS
7411				panic("Huh, freing tail? - TSNH");
7412#else
7413				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7414				sp->tail_mbuf = sp->data = NULL;
7415				sp->length = 0;
7416#endif
7417
7418			}
7419			sctp_m_free(m);
7420			m = sp->data;
7421		}
7422	}
7423	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7424		chk->copy_by_ref = 1;
7425	} else {
7426		chk->copy_by_ref = 0;
7427	}
7428	/*
7429	 * get last_mbuf and counts of mb useage This is ugly but hopefully
7430	 * its only one mbuf.
7431	 */
7432	if (chk->last_mbuf == NULL) {
7433		chk->last_mbuf = chk->data;
7434		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7435			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7436		}
7437	}
7438	if (to_move > length) {
7439		/*- This should not happen either
7440		 * since we always lower to_move to the size
7441		 * of sp->length if its larger.
7442		 */
7443#ifdef INVARIANTS
7444		panic("Huh, how can to_move be larger?");
7445#else
7446		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7447		sp->length = 0;
7448#endif
7449	} else {
7450		atomic_subtract_int(&sp->length, to_move);
7451	}
7452	if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7453		/* Not enough room for a chunk header, get some */
7454		struct mbuf *m;
7455
7456		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7457		if (m == NULL) {
7458			/*
7459			 * we're in trouble here. _PREPEND below will free
7460			 * all the data if there is no leading space, so we
7461			 * must put the data back and restore.
7462			 */
7463			if (send_lock_up == 0) {
7464				SCTP_TCB_SEND_LOCK(stcb);
7465				send_lock_up = 1;
7466			}
7467			if (chk->data == NULL) {
7468				/* unsteal the data */
7469				sp->data = chk->data;
7470				sp->tail_mbuf = chk->last_mbuf;
7471			} else {
7472				struct mbuf *m_tmp;
7473
7474				/* reassemble the data */
7475				m_tmp = sp->data;
7476				sp->data = chk->data;
7477				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7478			}
7479			sp->some_taken = some_taken;
7480			atomic_add_int(&sp->length, to_move);
7481			chk->data = NULL;
7482			*bail = 1;
7483			sctp_free_a_chunk(stcb, chk, so_locked);
7484			to_move = 0;
7485			goto out_of;
7486		} else {
7487			SCTP_BUF_LEN(m) = 0;
7488			SCTP_BUF_NEXT(m) = chk->data;
7489			chk->data = m;
7490			M_ALIGN(chk->data, 4);
7491		}
7492	}
7493	SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7494	if (chk->data == NULL) {
7495		/* HELP, TSNH since we assured it would not above? */
7496#ifdef INVARIANTS
7497		panic("prepend failes HELP?");
7498#else
7499		SCTP_PRINTF("prepend fails HELP?\n");
7500		sctp_free_a_chunk(stcb, chk, so_locked);
7501#endif
7502		*bail = 1;
7503		to_move = 0;
7504		goto out_of;
7505	}
7506	sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7507	chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7508	chk->book_size_scale = 0;
7509	chk->sent = SCTP_DATAGRAM_UNSENT;
7510
7511	chk->flags = 0;
7512	chk->asoc = &stcb->asoc;
7513	chk->pad_inplace = 0;
7514	chk->no_fr_allowed = 0;
7515	chk->rec.data.stream_seq = strq->next_sequence_send;
7516	if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7517	    !(rcv_flags & SCTP_DATA_UNORDERED)) {
7518		strq->next_sequence_send++;
7519	}
7520	chk->rec.data.stream_number = sp->stream;
7521	chk->rec.data.payloadtype = sp->ppid;
7522	chk->rec.data.context = sp->context;
7523	chk->rec.data.doing_fast_retransmit = 0;
7524
7525	chk->rec.data.timetodrop = sp->ts;
7526	chk->flags = sp->act_flags;
7527
7528	if (sp->net) {
7529		chk->whoTo = sp->net;
7530		atomic_add_int(&chk->whoTo->ref_count, 1);
7531	} else
7532		chk->whoTo = NULL;
7533
7534	if (sp->holds_key_ref) {
7535		chk->auth_keyid = sp->auth_keyid;
7536		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7537		chk->holds_key_ref = 1;
7538	}
7539	chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7540	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7541		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7542		    (uintptr_t) stcb, sp->length,
7543		    (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7544		    chk->rec.data.TSN_seq);
7545	}
7546	dchkh = mtod(chk->data, struct sctp_data_chunk *);
7547	/*
7548	 * Put the rest of the things in place now. Size was done earlier in
7549	 * previous loop prior to padding.
7550	 */
7551
7552#ifdef SCTP_ASOCLOG_OF_TSNS
7553	SCTP_TCB_LOCK_ASSERT(stcb);
7554	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7555		asoc->tsn_out_at = 0;
7556		asoc->tsn_out_wrapped = 1;
7557	}
7558	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7559	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7560	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7561	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7562	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7563	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7564	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7565	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7566	asoc->tsn_out_at++;
7567#endif
7568
7569	dchkh->ch.chunk_type = SCTP_DATA;
7570	dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7571	dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7572	dchkh->dp.stream_id = htons(strq->stream_no);
7573	dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7574	dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7575	dchkh->ch.chunk_length = htons(chk->send_size);
7576	/* Now advance the chk->send_size by the actual pad needed. */
7577	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7578		/* need a pad */
7579		struct mbuf *lm;
7580		int pads;
7581
7582		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7583		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7584		if (lm != NULL) {
7585			chk->last_mbuf = lm;
7586			chk->pad_inplace = 1;
7587		}
7588		chk->send_size += pads;
7589	}
7590	if (PR_SCTP_ENABLED(chk->flags)) {
7591		asoc->pr_sctp_cnt++;
7592	}
7593	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7594		/* All done pull and kill the message */
7595		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7596		if (sp->put_last_out == 0) {
7597			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7598			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7599			    sp->sender_all_done,
7600			    sp->length,
7601			    sp->msg_is_complete,
7602			    sp->put_last_out,
7603			    send_lock_up);
7604		}
7605		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7606			SCTP_TCB_SEND_LOCK(stcb);
7607			send_lock_up = 1;
7608		}
7609		TAILQ_REMOVE(&strq->outqueue, sp, next);
7610		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7611		if (sp->net) {
7612			sctp_free_remote_addr(sp->net);
7613			sp->net = NULL;
7614		}
7615		if (sp->data) {
7616			sctp_m_freem(sp->data);
7617			sp->data = NULL;
7618		}
7619		sctp_free_a_strmoq(stcb, sp, so_locked);
7620
7621		/* we can't be locked to it */
7622		*locked = 0;
7623		stcb->asoc.locked_on_sending = NULL;
7624	} else {
7625		/* more to go, we are locked */
7626		*locked = 1;
7627	}
7628	asoc->chunks_on_out_queue++;
7629	strq->chunks_on_queues++;
7630	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7631	asoc->send_queue_cnt++;
7632out_of:
7633	if (send_lock_up) {
7634		SCTP_TCB_SEND_UNLOCK(stcb);
7635	}
7636	return (to_move);
7637}
7638
7639
7640static void
7641sctp_fill_outqueue(struct sctp_tcb *stcb,
7642    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7643#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7644    SCTP_UNUSED
7645#endif
7646)
7647{
7648	struct sctp_association *asoc;
7649	struct sctp_stream_out *strq;
7650	int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7651	int locked, giveup;
7652
7653	SCTP_TCB_LOCK_ASSERT(stcb);
7654	asoc = &stcb->asoc;
7655	switch (net->ro._l_addr.sa.sa_family) {
7656#ifdef INET
7657	case AF_INET:
7658		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7659		break;
7660#endif
7661#ifdef INET6
7662	case AF_INET6:
7663		goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7664		break;
7665#endif
7666	default:
7667		/* TSNH */
7668		goal_mtu = net->mtu;
7669		break;
7670	}
7671	/* Need an allowance for the data chunk header too */
7672	goal_mtu -= sizeof(struct sctp_data_chunk);
7673
7674	/* must make even word boundary */
7675	goal_mtu &= 0xfffffffc;
7676	if (asoc->locked_on_sending) {
7677		/* We are stuck on one stream until the message completes. */
7678		strq = asoc->locked_on_sending;
7679		locked = 1;
7680	} else {
7681		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7682		locked = 0;
7683	}
7684	while ((goal_mtu > 0) && strq) {
7685		giveup = 0;
7686		bail = 0;
7687		moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7688		    &giveup, eeor_mode, &bail, so_locked);
7689		if (moved_how_much)
7690			stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7691
7692		if (locked) {
7693			asoc->locked_on_sending = strq;
7694			if ((moved_how_much == 0) || (giveup) || bail)
7695				/* no more to move for now */
7696				break;
7697		} else {
7698			asoc->locked_on_sending = NULL;
7699			if ((giveup) || bail) {
7700				break;
7701			}
7702			strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7703			if (strq == NULL) {
7704				break;
7705			}
7706		}
7707		total_moved += moved_how_much;
7708		goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7709		goal_mtu &= 0xfffffffc;
7710	}
7711	if (bail)
7712		*quit_now = 1;
7713
7714	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7715
7716	if (total_moved == 0) {
7717		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7718		    (net == stcb->asoc.primary_destination)) {
7719			/* ran dry for primary network net */
7720			SCTP_STAT_INCR(sctps_primary_randry);
7721		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7722			/* ran dry with CMT on */
7723			SCTP_STAT_INCR(sctps_cmt_randry);
7724		}
7725	}
7726}
7727
7728void
7729sctp_fix_ecn_echo(struct sctp_association *asoc)
7730{
7731	struct sctp_tmit_chunk *chk;
7732
7733	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7734		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7735			chk->sent = SCTP_DATAGRAM_UNSENT;
7736		}
7737	}
7738}
7739
7740void
7741sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7742{
7743	struct sctp_association *asoc;
7744	struct sctp_tmit_chunk *chk;
7745	struct sctp_stream_queue_pending *sp;
7746	unsigned int i;
7747
7748	if (net == NULL) {
7749		return;
7750	}
7751	asoc = &stcb->asoc;
7752	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7753		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7754			if (sp->net == net) {
7755				sctp_free_remote_addr(sp->net);
7756				sp->net = NULL;
7757			}
7758		}
7759	}
7760	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7761		if (chk->whoTo == net) {
7762			sctp_free_remote_addr(chk->whoTo);
7763			chk->whoTo = NULL;
7764		}
7765	}
7766}
7767
7768int
7769sctp_med_chunk_output(struct sctp_inpcb *inp,
7770    struct sctp_tcb *stcb,
7771    struct sctp_association *asoc,
7772    int *num_out,
7773    int *reason_code,
7774    int control_only, int from_where,
7775    struct timeval *now, int *now_filled, int frag_point, int so_locked
7776#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7777    SCTP_UNUSED
7778#endif
7779)
7780{
7781	/**
7782	 * Ok this is the generic chunk service queue. we must do the
7783	 * following: - Service the stream queue that is next, moving any
7784	 * message (note I must get a complete message i.e. FIRST/MIDDLE and
7785	 * LAST to the out queue in one pass) and assigning TSN's - Check to
7786	 * see if the cwnd/rwnd allows any output, if so we go ahead and
7787	 * fomulate and send the low level chunks. Making sure to combine
7788	 * any control in the control chunk queue also.
7789	 */
7790	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7791	struct mbuf *outchain, *endoutchain;
7792	struct sctp_tmit_chunk *chk, *nchk;
7793
7794	/* temp arrays for unlinking */
7795	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7796	int no_fragmentflg, error;
7797	unsigned int max_rwnd_per_dest, max_send_per_dest;
7798	int one_chunk, hbflag, skip_data_for_this_net;
7799	int asconf, cookie, no_out_cnt;
7800	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7801	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7802	int tsns_sent = 0;
7803	uint32_t auth_offset = 0;
7804	struct sctp_auth_chunk *auth = NULL;
7805	uint16_t auth_keyid;
7806	int override_ok = 1;
7807	int skip_fill_up = 0;
7808	int data_auth_reqd = 0;
7809
7810	/*
7811	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7812	 * destination.
7813	 */
7814	int quit_now = 0;
7815
7816	*num_out = 0;
7817	auth_keyid = stcb->asoc.authinfo.active_keyid;
7818	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7819	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7820	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7821		eeor_mode = 1;
7822	} else {
7823		eeor_mode = 0;
7824	}
7825	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7826	/*
7827	 * First lets prime the pump. For each destination, if there is room
7828	 * in the flight size, attempt to pull an MTU's worth out of the
7829	 * stream queues into the general send_queue
7830	 */
7831#ifdef SCTP_AUDITING_ENABLED
7832	sctp_audit_log(0xC2, 2);
7833#endif
7834	SCTP_TCB_LOCK_ASSERT(stcb);
7835	hbflag = 0;
7836	if ((control_only) || (asoc->stream_reset_outstanding))
7837		no_data_chunks = 1;
7838	else
7839		no_data_chunks = 0;
7840
7841	/* Nothing to possible to send? */
7842	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7843	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7844	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7845	    TAILQ_EMPTY(&asoc->send_queue) &&
7846	    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7847nothing_to_send:
7848		*reason_code = 9;
7849		return (0);
7850	}
7851	if (asoc->peers_rwnd == 0) {
7852		/* No room in peers rwnd */
7853		*reason_code = 1;
7854		if (asoc->total_flight > 0) {
7855			/* we are allowed one chunk in flight */
7856			no_data_chunks = 1;
7857		}
7858	}
7859	if (stcb->asoc.ecn_echo_cnt_onq) {
7860		/* Record where a sack goes, if any */
7861		if (no_data_chunks &&
7862		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7863			/* Nothing but ECNe to send - we don't do that */
7864			goto nothing_to_send;
7865		}
7866		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7867			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7868			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7869				sack_goes_to = chk->whoTo;
7870				break;
7871			}
7872		}
7873	}
7874	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7875	if (stcb->sctp_socket)
7876		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7877	else
7878		max_send_per_dest = 0;
7879	if (no_data_chunks == 0) {
7880		/* How many non-directed chunks are there? */
7881		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7882			if (chk->whoTo == NULL) {
7883				/*
7884				 * We already have non-directed chunks on
7885				 * the queue, no need to do a fill-up.
7886				 */
7887				skip_fill_up = 1;
7888				break;
7889			}
7890		}
7891
7892	}
7893	if ((no_data_chunks == 0) &&
7894	    (skip_fill_up == 0) &&
7895	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7896		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7897			/*
7898			 * This for loop we are in takes in each net, if
7899			 * its's got space in cwnd and has data sent to it
7900			 * (when CMT is off) then it calls
7901			 * sctp_fill_outqueue for the net. This gets data on
7902			 * the send queue for that network.
7903			 *
7904			 * In sctp_fill_outqueue TSN's are assigned and data is
7905			 * copied out of the stream buffers. Note mostly
7906			 * copy by reference (we hope).
7907			 */
7908			net->window_probe = 0;
7909			if ((net != stcb->asoc.alternate) &&
7910			    ((net->dest_state & SCTP_ADDR_PF) ||
7911			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7912			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7913				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7914					sctp_log_cwnd(stcb, net, 1,
7915					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7916				}
7917				continue;
7918			}
7919			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7920			    (net->flight_size == 0)) {
7921				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7922			}
7923			if (net->flight_size >= net->cwnd) {
7924				/* skip this network, no room - can't fill */
7925				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7926					sctp_log_cwnd(stcb, net, 3,
7927					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7928				}
7929				continue;
7930			}
7931			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7932				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7933			}
7934			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7935			if (quit_now) {
7936				/* memory alloc failure */
7937				no_data_chunks = 1;
7938				break;
7939			}
7940		}
7941	}
7942	/* now service each destination and send out what we can for it */
7943	/* Nothing to send? */
7944	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7945	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7946	    TAILQ_EMPTY(&asoc->send_queue)) {
7947		*reason_code = 8;
7948		return (0);
7949	}
7950	if (asoc->sctp_cmt_on_off > 0) {
7951		/* get the last start point */
7952		start_at = asoc->last_net_cmt_send_started;
7953		if (start_at == NULL) {
7954			/* null so to beginning */
7955			start_at = TAILQ_FIRST(&asoc->nets);
7956		} else {
7957			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7958			if (start_at == NULL) {
7959				start_at = TAILQ_FIRST(&asoc->nets);
7960			}
7961		}
7962		asoc->last_net_cmt_send_started = start_at;
7963	} else {
7964		start_at = TAILQ_FIRST(&asoc->nets);
7965	}
7966	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7967		if (chk->whoTo == NULL) {
7968			if (asoc->alternate) {
7969				chk->whoTo = asoc->alternate;
7970			} else {
7971				chk->whoTo = asoc->primary_destination;
7972			}
7973			atomic_add_int(&chk->whoTo->ref_count, 1);
7974		}
7975	}
7976	old_start_at = NULL;
7977again_one_more_time:
7978	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7979		/* how much can we send? */
7980		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7981		if (old_start_at && (old_start_at == net)) {
7982			/* through list ocmpletely. */
7983			break;
7984		}
7985		tsns_sent = 0xa;
7986		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7987		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7988		    (net->flight_size >= net->cwnd)) {
7989			/*
7990			 * Nothing on control or asconf and flight is full,
7991			 * we can skip even in the CMT case.
7992			 */
7993			continue;
7994		}
7995		bundle_at = 0;
7996		endoutchain = outchain = NULL;
7997		no_fragmentflg = 1;
7998		one_chunk = 0;
7999		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8000			skip_data_for_this_net = 1;
8001		} else {
8002			skip_data_for_this_net = 0;
8003		}
8004		if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
8005			/*
8006			 * if we have a route and an ifp check to see if we
8007			 * have room to send to this guy
8008			 */
8009			struct ifnet *ifp;
8010
8011			ifp = net->ro.ro_rt->rt_ifp;
8012			if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
8013				SCTP_STAT_INCR(sctps_ifnomemqueued);
8014				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
8015					sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
8016				}
8017				continue;
8018			}
8019		}
8020		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8021#ifdef INET
8022		case AF_INET:
8023			mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8024			break;
8025#endif
8026#ifdef INET6
8027		case AF_INET6:
8028			mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8029			break;
8030#endif
8031		default:
8032			/* TSNH */
8033			mtu = net->mtu;
8034			break;
8035		}
8036		mx_mtu = mtu;
8037		to_out = 0;
8038		if (mtu > asoc->peers_rwnd) {
8039			if (asoc->total_flight > 0) {
8040				/* We have a packet in flight somewhere */
8041				r_mtu = asoc->peers_rwnd;
8042			} else {
8043				/* We are always allowed to send one MTU out */
8044				one_chunk = 1;
8045				r_mtu = mtu;
8046			}
8047		} else {
8048			r_mtu = mtu;
8049		}
8050		/************************/
8051		/* ASCONF transmission */
8052		/************************/
8053		/* Now first lets go through the asconf queue */
8054		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8055			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8056				continue;
8057			}
8058			if (chk->whoTo == NULL) {
8059				if (asoc->alternate == NULL) {
8060					if (asoc->primary_destination != net) {
8061						break;
8062					}
8063				} else {
8064					if (asoc->alternate != net) {
8065						break;
8066					}
8067				}
8068			} else {
8069				if (chk->whoTo != net) {
8070					break;
8071				}
8072			}
8073			if (chk->data == NULL) {
8074				break;
8075			}
8076			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8077			    chk->sent != SCTP_DATAGRAM_RESEND) {
8078				break;
8079			}
8080			/*
8081			 * if no AUTH is yet included and this chunk
8082			 * requires it, make sure to account for it.  We
8083			 * don't apply the size until the AUTH chunk is
8084			 * actually added below in case there is no room for
8085			 * this chunk. NOTE: we overload the use of "omtu"
8086			 * here
8087			 */
8088			if ((auth == NULL) &&
8089			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8090			    stcb->asoc.peer_auth_chunks)) {
8091				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8092			} else
8093				omtu = 0;
8094			/* Here we do NOT factor the r_mtu */
8095			if ((chk->send_size < (int)(mtu - omtu)) ||
8096			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8097				/*
8098				 * We probably should glom the mbuf chain
8099				 * from the chk->data for control but the
8100				 * problem is it becomes yet one more level
8101				 * of tracking to do if for some reason
8102				 * output fails. Then I have got to
8103				 * reconstruct the merged control chain.. el
8104				 * yucko.. for now we take the easy way and
8105				 * do the copy
8106				 */
8107				/*
8108				 * Add an AUTH chunk, if chunk requires it
8109				 * save the offset into the chain for AUTH
8110				 */
8111				if ((auth == NULL) &&
8112				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8113				    stcb->asoc.peer_auth_chunks))) {
8114					outchain = sctp_add_auth_chunk(outchain,
8115					    &endoutchain,
8116					    &auth,
8117					    &auth_offset,
8118					    stcb,
8119					    chk->rec.chunk_id.id);
8120					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8121				}
8122				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8123				    (int)chk->rec.chunk_id.can_take_data,
8124				    chk->send_size, chk->copy_by_ref);
8125				if (outchain == NULL) {
8126					*reason_code = 8;
8127					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8128					return (ENOMEM);
8129				}
8130				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8131				/* update our MTU size */
8132				if (mtu > (chk->send_size + omtu))
8133					mtu -= (chk->send_size + omtu);
8134				else
8135					mtu = 0;
8136				to_out += (chk->send_size + omtu);
8137				/* Do clear IP_DF ? */
8138				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8139					no_fragmentflg = 0;
8140				}
8141				if (chk->rec.chunk_id.can_take_data)
8142					chk->data = NULL;
8143				/*
8144				 * set hb flag since we can use these for
8145				 * RTO
8146				 */
8147				hbflag = 1;
8148				asconf = 1;
8149				/*
8150				 * should sysctl this: don't bundle data
8151				 * with ASCONF since it requires AUTH
8152				 */
8153				no_data_chunks = 1;
8154				chk->sent = SCTP_DATAGRAM_SENT;
8155				if (chk->whoTo == NULL) {
8156					chk->whoTo = net;
8157					atomic_add_int(&net->ref_count, 1);
8158				}
8159				chk->snd_count++;
8160				if (mtu == 0) {
8161					/*
8162					 * Ok we are out of room but we can
8163					 * output without effecting the
8164					 * flight size since this little guy
8165					 * is a control only packet.
8166					 */
8167					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8168					/*
8169					 * do NOT clear the asconf flag as
8170					 * it is used to do appropriate
8171					 * source address selection.
8172					 */
8173					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8174					    (struct sockaddr *)&net->ro._l_addr,
8175					    outchain, auth_offset, auth,
8176					    stcb->asoc.authinfo.active_keyid,
8177					    no_fragmentflg, 0, asconf,
8178					    inp->sctp_lport, stcb->rport,
8179					    htonl(stcb->asoc.peer_vtag),
8180					    net->port, NULL,
8181					    0, 0,
8182					    so_locked))) {
8183						if (error == ENOBUFS) {
8184							asoc->ifp_had_enobuf = 1;
8185							SCTP_STAT_INCR(sctps_lowlevelerr);
8186						}
8187						if (from_where == 0) {
8188							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8189						}
8190						if (*now_filled == 0) {
8191							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8192							*now_filled = 1;
8193							*now = net->last_sent_time;
8194						} else {
8195							net->last_sent_time = *now;
8196						}
8197						hbflag = 0;
8198						/* error, could not output */
8199						if (error == EHOSTUNREACH) {
8200							/*
8201							 * Destination went
8202							 * unreachable
8203							 * during this send
8204							 */
8205							sctp_move_chunks_from_net(stcb, net);
8206						}
8207						*reason_code = 7;
8208						continue;
8209					} else
8210						asoc->ifp_had_enobuf = 0;
8211					if (*now_filled == 0) {
8212						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8213						*now_filled = 1;
8214						*now = net->last_sent_time;
8215					} else {
8216						net->last_sent_time = *now;
8217					}
8218					hbflag = 0;
8219					/*
8220					 * increase the number we sent, if a
8221					 * cookie is sent we don't tell them
8222					 * any was sent out.
8223					 */
8224					outchain = endoutchain = NULL;
8225					auth = NULL;
8226					auth_offset = 0;
8227					if (!no_out_cnt)
8228						*num_out += ctl_cnt;
8229					/* recalc a clean slate and setup */
8230					switch (net->ro._l_addr.sa.sa_family) {
8231#ifdef INET
8232					case AF_INET:
8233						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8234						break;
8235#endif
8236#ifdef INET6
8237					case AF_INET6:
8238						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8239						break;
8240#endif
8241					default:
8242						/* TSNH */
8243						mtu = net->mtu;
8244						break;
8245					}
8246					to_out = 0;
8247					no_fragmentflg = 1;
8248				}
8249			}
8250		}
8251		/************************/
8252		/* Control transmission */
8253		/************************/
8254		/* Now first lets go through the control queue */
8255		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8256			if ((sack_goes_to) &&
8257			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8258			    (chk->whoTo != sack_goes_to)) {
8259				/*
8260				 * if we have a sack in queue, and we are
8261				 * looking at an ecn echo that is NOT queued
8262				 * to where the sack is going..
8263				 */
8264				if (chk->whoTo == net) {
8265					/*
8266					 * Don't transmit it to where its
8267					 * going (current net)
8268					 */
8269					continue;
8270				} else if (sack_goes_to == net) {
8271					/*
8272					 * But do transmit it to this
8273					 * address
8274					 */
8275					goto skip_net_check;
8276				}
8277			}
8278			if (chk->whoTo == NULL) {
8279				if (asoc->alternate == NULL) {
8280					if (asoc->primary_destination != net) {
8281						continue;
8282					}
8283				} else {
8284					if (asoc->alternate != net) {
8285						continue;
8286					}
8287				}
8288			} else {
8289				if (chk->whoTo != net) {
8290					continue;
8291				}
8292			}
8293	skip_net_check:
8294			if (chk->data == NULL) {
8295				continue;
8296			}
8297			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8298				/*
8299				 * It must be unsent. Cookies and ASCONF's
8300				 * hang around but there timers will force
8301				 * when marked for resend.
8302				 */
8303				continue;
8304			}
8305			/*
8306			 * if no AUTH is yet included and this chunk
8307			 * requires it, make sure to account for it.  We
8308			 * don't apply the size until the AUTH chunk is
8309			 * actually added below in case there is no room for
8310			 * this chunk. NOTE: we overload the use of "omtu"
8311			 * here
8312			 */
8313			if ((auth == NULL) &&
8314			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8315			    stcb->asoc.peer_auth_chunks)) {
8316				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8317			} else
8318				omtu = 0;
8319			/* Here we do NOT factor the r_mtu */
8320			if ((chk->send_size <= (int)(mtu - omtu)) ||
8321			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8322				/*
8323				 * We probably should glom the mbuf chain
8324				 * from the chk->data for control but the
8325				 * problem is it becomes yet one more level
8326				 * of tracking to do if for some reason
8327				 * output fails. Then I have got to
8328				 * reconstruct the merged control chain.. el
8329				 * yucko.. for now we take the easy way and
8330				 * do the copy
8331				 */
8332				/*
8333				 * Add an AUTH chunk, if chunk requires it
8334				 * save the offset into the chain for AUTH
8335				 */
8336				if ((auth == NULL) &&
8337				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8338				    stcb->asoc.peer_auth_chunks))) {
8339					outchain = sctp_add_auth_chunk(outchain,
8340					    &endoutchain,
8341					    &auth,
8342					    &auth_offset,
8343					    stcb,
8344					    chk->rec.chunk_id.id);
8345					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8346				}
8347				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8348				    (int)chk->rec.chunk_id.can_take_data,
8349				    chk->send_size, chk->copy_by_ref);
8350				if (outchain == NULL) {
8351					*reason_code = 8;
8352					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8353					return (ENOMEM);
8354				}
8355				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8356				/* update our MTU size */
8357				if (mtu > (chk->send_size + omtu))
8358					mtu -= (chk->send_size + omtu);
8359				else
8360					mtu = 0;
8361				to_out += (chk->send_size + omtu);
8362				/* Do clear IP_DF ? */
8363				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8364					no_fragmentflg = 0;
8365				}
8366				if (chk->rec.chunk_id.can_take_data)
8367					chk->data = NULL;
8368				/* Mark things to be removed, if needed */
8369				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8370				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8371				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8372				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8373				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8374				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8375				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8376				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8377				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8378				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8379				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8380					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8381						hbflag = 1;
8382					}
8383					/* remove these chunks at the end */
8384					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8385					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8386						/* turn off the timer */
8387						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8388							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8389							    inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8390						}
8391					}
8392					ctl_cnt++;
8393				} else {
8394					/*
8395					 * Other chunks, since they have
8396					 * timers running (i.e. COOKIE) we
8397					 * just "trust" that it gets sent or
8398					 * retransmitted.
8399					 */
8400					ctl_cnt++;
8401					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8402						cookie = 1;
8403						no_out_cnt = 1;
8404					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8405						/*
8406						 * Increment ecne send count
8407						 * here this means we may be
8408						 * over-zealous in our
8409						 * counting if the send
8410						 * fails, but its the best
8411						 * place to do it (we used
8412						 * to do it in the queue of
8413						 * the chunk, but that did
8414						 * not tell how many times
8415						 * it was sent.
8416						 */
8417						SCTP_STAT_INCR(sctps_sendecne);
8418					}
8419					chk->sent = SCTP_DATAGRAM_SENT;
8420					if (chk->whoTo == NULL) {
8421						chk->whoTo = net;
8422						atomic_add_int(&net->ref_count, 1);
8423					}
8424					chk->snd_count++;
8425				}
8426				if (mtu == 0) {
8427					/*
8428					 * Ok we are out of room but we can
8429					 * output without effecting the
8430					 * flight size since this little guy
8431					 * is a control only packet.
8432					 */
8433					if (asconf) {
8434						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8435						/*
8436						 * do NOT clear the asconf
8437						 * flag as it is used to do
8438						 * appropriate source
8439						 * address selection.
8440						 */
8441					}
8442					if (cookie) {
8443						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8444						cookie = 0;
8445					}
8446					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8447					    (struct sockaddr *)&net->ro._l_addr,
8448					    outchain,
8449					    auth_offset, auth,
8450					    stcb->asoc.authinfo.active_keyid,
8451					    no_fragmentflg, 0, asconf,
8452					    inp->sctp_lport, stcb->rport,
8453					    htonl(stcb->asoc.peer_vtag),
8454					    net->port, NULL,
8455					    0, 0,
8456					    so_locked))) {
8457						if (error == ENOBUFS) {
8458							asoc->ifp_had_enobuf = 1;
8459							SCTP_STAT_INCR(sctps_lowlevelerr);
8460						}
8461						if (from_where == 0) {
8462							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8463						}
8464						/* error, could not output */
8465						if (hbflag) {
8466							if (*now_filled == 0) {
8467								(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8468								*now_filled = 1;
8469								*now = net->last_sent_time;
8470							} else {
8471								net->last_sent_time = *now;
8472							}
8473							hbflag = 0;
8474						}
8475						if (error == EHOSTUNREACH) {
8476							/*
8477							 * Destination went
8478							 * unreachable
8479							 * during this send
8480							 */
8481							sctp_move_chunks_from_net(stcb, net);
8482						}
8483						*reason_code = 7;
8484						continue;
8485					} else
8486						asoc->ifp_had_enobuf = 0;
8487					/* Only HB or ASCONF advances time */
8488					if (hbflag) {
8489						if (*now_filled == 0) {
8490							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8491							*now_filled = 1;
8492							*now = net->last_sent_time;
8493						} else {
8494							net->last_sent_time = *now;
8495						}
8496						hbflag = 0;
8497					}
8498					/*
8499					 * increase the number we sent, if a
8500					 * cookie is sent we don't tell them
8501					 * any was sent out.
8502					 */
8503					outchain = endoutchain = NULL;
8504					auth = NULL;
8505					auth_offset = 0;
8506					if (!no_out_cnt)
8507						*num_out += ctl_cnt;
8508					/* recalc a clean slate and setup */
8509					switch (net->ro._l_addr.sa.sa_family) {
8510#ifdef INET
8511					case AF_INET:
8512						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8513						break;
8514#endif
8515#ifdef INET6
8516					case AF_INET6:
8517						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8518						break;
8519#endif
8520					default:
8521						/* TSNH */
8522						mtu = net->mtu;
8523						break;
8524					}
8525					to_out = 0;
8526					no_fragmentflg = 1;
8527				}
8528			}
8529		}
8530		/* JRI: if dest is in PF state, do not send data to it */
8531		if ((asoc->sctp_cmt_on_off > 0) &&
8532		    (net != stcb->asoc.alternate) &&
8533		    (net->dest_state & SCTP_ADDR_PF)) {
8534			goto no_data_fill;
8535		}
8536		if (net->flight_size >= net->cwnd) {
8537			goto no_data_fill;
8538		}
8539		if ((asoc->sctp_cmt_on_off > 0) &&
8540		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8541		    (net->flight_size > max_rwnd_per_dest)) {
8542			goto no_data_fill;
8543		}
8544		/*
8545		 * We need a specific accounting for the usage of the send
8546		 * buffer. We also need to check the number of messages per
8547		 * net. For now, this is better than nothing and it disabled
8548		 * by default...
8549		 */
8550		if ((asoc->sctp_cmt_on_off > 0) &&
8551		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8552		    (max_send_per_dest > 0) &&
8553		    (net->flight_size > max_send_per_dest)) {
8554			goto no_data_fill;
8555		}
8556		/*********************/
8557		/* Data transmission */
8558		/*********************/
8559		/*
8560		 * if AUTH for DATA is required and no AUTH has been added
8561		 * yet, account for this in the mtu now... if no data can be
8562		 * bundled, this adjustment won't matter anyways since the
8563		 * packet will be going out...
8564		 */
8565		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8566		    stcb->asoc.peer_auth_chunks);
8567		if (data_auth_reqd && (auth == NULL)) {
8568			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8569		}
8570		/* now lets add any data within the MTU constraints */
8571		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8572#ifdef INET
8573		case AF_INET:
8574			if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8575				omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8576			else
8577				omtu = 0;
8578			break;
8579#endif
8580#ifdef INET6
8581		case AF_INET6:
8582			if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8583				omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8584			else
8585				omtu = 0;
8586			break;
8587#endif
8588		default:
8589			/* TSNH */
8590			omtu = 0;
8591			break;
8592		}
8593		if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8594		    (skip_data_for_this_net == 0)) ||
8595		    (cookie)) {
8596			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8597				if (no_data_chunks) {
8598					/* let only control go out */
8599					*reason_code = 1;
8600					break;
8601				}
8602				if (net->flight_size >= net->cwnd) {
8603					/* skip this net, no room for data */
8604					*reason_code = 2;
8605					break;
8606				}
8607				if ((chk->whoTo != NULL) &&
8608				    (chk->whoTo != net)) {
8609					/* Don't send the chunk on this net */
8610					continue;
8611				}
8612				if (asoc->sctp_cmt_on_off == 0) {
8613					if ((asoc->alternate) &&
8614					    (asoc->alternate != net) &&
8615					    (chk->whoTo == NULL)) {
8616						continue;
8617					} else if ((net != asoc->primary_destination) &&
8618						    (asoc->alternate == NULL) &&
8619					    (chk->whoTo == NULL)) {
8620						continue;
8621					}
8622				}
8623				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8624					/*-
8625					 * strange, we have a chunk that is
8626					 * to big for its destination and
8627					 * yet no fragment ok flag.
8628					 * Something went wrong when the
8629					 * PMTU changed...we did not mark
8630					 * this chunk for some reason?? I
8631					 * will fix it here by letting IP
8632					 * fragment it for now and printing
8633					 * a warning. This really should not
8634					 * happen ...
8635					 */
8636					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8637					    chk->send_size, mtu);
8638					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8639				}
8640				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8641				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8642					struct sctp_data_chunk *dchkh;
8643
8644					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8645					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8646				}
8647				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8648				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8649					/* ok we will add this one */
8650
8651					/*
8652					 * Add an AUTH chunk, if chunk
8653					 * requires it, save the offset into
8654					 * the chain for AUTH
8655					 */
8656					if (data_auth_reqd) {
8657						if (auth == NULL) {
8658							outchain = sctp_add_auth_chunk(outchain,
8659							    &endoutchain,
8660							    &auth,
8661							    &auth_offset,
8662							    stcb,
8663							    SCTP_DATA);
8664							auth_keyid = chk->auth_keyid;
8665							override_ok = 0;
8666							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8667						} else if (override_ok) {
8668							/*
8669							 * use this data's
8670							 * keyid
8671							 */
8672							auth_keyid = chk->auth_keyid;
8673							override_ok = 0;
8674						} else if (auth_keyid != chk->auth_keyid) {
8675							/*
8676							 * different keyid,
8677							 * so done bundling
8678							 */
8679							break;
8680						}
8681					}
8682					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8683					    chk->send_size, chk->copy_by_ref);
8684					if (outchain == NULL) {
8685						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8686						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8687							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8688						}
8689						*reason_code = 3;
8690						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8691						return (ENOMEM);
8692					}
8693					/* upate our MTU size */
8694					/* Do clear IP_DF ? */
8695					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8696						no_fragmentflg = 0;
8697					}
8698					/* unsigned subtraction of mtu */
8699					if (mtu > chk->send_size)
8700						mtu -= chk->send_size;
8701					else
8702						mtu = 0;
8703					/* unsigned subtraction of r_mtu */
8704					if (r_mtu > chk->send_size)
8705						r_mtu -= chk->send_size;
8706					else
8707						r_mtu = 0;
8708
8709					to_out += chk->send_size;
8710					if ((to_out > mx_mtu) && no_fragmentflg) {
8711#ifdef INVARIANTS
8712						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8713#else
8714						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8715						    mx_mtu, to_out);
8716#endif
8717					}
8718					chk->window_probe = 0;
8719					data_list[bundle_at++] = chk;
8720					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8721						break;
8722					}
8723					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8724						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8725							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8726						} else {
8727							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8728						}
8729						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8730						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8731							/*
8732							 * Count number of
8733							 * user msg's that
8734							 * were fragmented
8735							 * we do this by
8736							 * counting when we
8737							 * see a LAST
8738							 * fragment only.
8739							 */
8740							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8741					}
8742					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8743						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8744							data_list[0]->window_probe = 1;
8745							net->window_probe = 1;
8746						}
8747						break;
8748					}
8749				} else {
8750					/*
8751					 * Must be sent in order of the
8752					 * TSN's (on a network)
8753					 */
8754					break;
8755				}
8756			}	/* for (chunk gather loop for this net) */
8757		}		/* if asoc.state OPEN */
8758no_data_fill:
8759		/* Is there something to send for this destination? */
8760		if (outchain) {
8761			/* We may need to start a control timer or two */
8762			if (asconf) {
8763				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8764				    stcb, net);
8765				/*
8766				 * do NOT clear the asconf flag as it is
8767				 * used to do appropriate source address
8768				 * selection.
8769				 */
8770			}
8771			if (cookie) {
8772				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8773				cookie = 0;
8774			}
8775			/* must start a send timer if data is being sent */
8776			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8777				/*
8778				 * no timer running on this destination
8779				 * restart it.
8780				 */
8781				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8782			}
8783			/* Now send it, if there is anything to send :> */
8784			if ((error = sctp_lowlevel_chunk_output(inp,
8785			    stcb,
8786			    net,
8787			    (struct sockaddr *)&net->ro._l_addr,
8788			    outchain,
8789			    auth_offset,
8790			    auth,
8791			    auth_keyid,
8792			    no_fragmentflg,
8793			    bundle_at,
8794			    asconf,
8795			    inp->sctp_lport, stcb->rport,
8796			    htonl(stcb->asoc.peer_vtag),
8797			    net->port, NULL,
8798			    0, 0,
8799			    so_locked))) {
8800				/* error, we could not output */
8801				if (error == ENOBUFS) {
8802					SCTP_STAT_INCR(sctps_lowlevelerr);
8803					asoc->ifp_had_enobuf = 1;
8804				}
8805				if (from_where == 0) {
8806					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8807				}
8808				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8809				if (hbflag) {
8810					if (*now_filled == 0) {
8811						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8812						*now_filled = 1;
8813						*now = net->last_sent_time;
8814					} else {
8815						net->last_sent_time = *now;
8816					}
8817					hbflag = 0;
8818				}
8819				if (error == EHOSTUNREACH) {
8820					/*
8821					 * Destination went unreachable
8822					 * during this send
8823					 */
8824					sctp_move_chunks_from_net(stcb, net);
8825				}
8826				*reason_code = 6;
8827				/*-
8828				 * I add this line to be paranoid. As far as
8829				 * I can tell the continue, takes us back to
8830				 * the top of the for, but just to make sure
8831				 * I will reset these again here.
8832				 */
8833				ctl_cnt = bundle_at = 0;
8834				continue;	/* This takes us back to the
8835						 * for() for the nets. */
8836			} else {
8837				asoc->ifp_had_enobuf = 0;
8838			}
8839			endoutchain = NULL;
8840			auth = NULL;
8841			auth_offset = 0;
8842			if (bundle_at || hbflag) {
8843				/* For data/asconf and hb set time */
8844				if (*now_filled == 0) {
8845					(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8846					*now_filled = 1;
8847					*now = net->last_sent_time;
8848				} else {
8849					net->last_sent_time = *now;
8850				}
8851			}
8852			if (!no_out_cnt) {
8853				*num_out += (ctl_cnt + bundle_at);
8854			}
8855			if (bundle_at) {
8856				/* setup for a RTO measurement */
8857				tsns_sent = data_list[0]->rec.data.TSN_seq;
8858				/* fill time if not already filled */
8859				if (*now_filled == 0) {
8860					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8861					*now_filled = 1;
8862					*now = asoc->time_last_sent;
8863				} else {
8864					asoc->time_last_sent = *now;
8865				}
8866				if (net->rto_needed) {
8867					data_list[0]->do_rtt = 1;
8868					net->rto_needed = 0;
8869				}
8870				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8871				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8872			}
8873			if (one_chunk) {
8874				break;
8875			}
8876		}
8877		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8878			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8879		}
8880	}
8881	if (old_start_at == NULL) {
8882		old_start_at = start_at;
8883		start_at = TAILQ_FIRST(&asoc->nets);
8884		if (old_start_at)
8885			goto again_one_more_time;
8886	}
8887	/*
8888	 * At the end there should be no NON timed chunks hanging on this
8889	 * queue.
8890	 */
8891	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8892		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8893	}
8894	if ((*num_out == 0) && (*reason_code == 0)) {
8895		*reason_code = 4;
8896	} else {
8897		*reason_code = 5;
8898	}
8899	sctp_clean_up_ctl(stcb, asoc, so_locked);
8900	return (0);
8901}
8902
8903void
8904sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8905{
8906	/*-
8907	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8908	 * the control chunk queue.
8909	 */
8910	struct sctp_chunkhdr *hdr;
8911	struct sctp_tmit_chunk *chk;
8912	struct mbuf *mat;
8913
8914	SCTP_TCB_LOCK_ASSERT(stcb);
8915	sctp_alloc_a_chunk(stcb, chk);
8916	if (chk == NULL) {
8917		/* no memory */
8918		sctp_m_freem(op_err);
8919		return;
8920	}
8921	chk->copy_by_ref = 0;
8922	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8923	if (op_err == NULL) {
8924		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8925		return;
8926	}
8927	chk->send_size = 0;
8928	for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8929		chk->send_size += SCTP_BUF_LEN(mat);
8930	}
8931	chk->sent = SCTP_DATAGRAM_UNSENT;
8932	chk->snd_count = 0;
8933	chk->asoc = &stcb->asoc;
8934	chk->data = op_err;
8935	chk->whoTo = NULL;
8936	hdr = mtod(op_err, struct sctp_chunkhdr *);
8937	hdr->chunk_type = SCTP_OPERATION_ERROR;
8938	hdr->chunk_flags = 0;
8939	hdr->chunk_length = htons(chk->send_size);
8940	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8941	    chk,
8942	    sctp_next);
8943	chk->asoc->ctrl_queue_cnt++;
8944}
8945
8946int
8947sctp_send_cookie_echo(struct mbuf *m,
8948    int offset,
8949    struct sctp_tcb *stcb,
8950    struct sctp_nets *net)
8951{
8952	/*-
8953	 * pull out the cookie and put it at the front of the control chunk
8954	 * queue.
8955	 */
8956	int at;
8957	struct mbuf *cookie;
8958	struct sctp_paramhdr parm, *phdr;
8959	struct sctp_chunkhdr *hdr;
8960	struct sctp_tmit_chunk *chk;
8961	uint16_t ptype, plen;
8962
8963	/* First find the cookie in the param area */
8964	cookie = NULL;
8965	at = offset + sizeof(struct sctp_init_chunk);
8966
8967	SCTP_TCB_LOCK_ASSERT(stcb);
8968	do {
8969		phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8970		if (phdr == NULL) {
8971			return (-3);
8972		}
8973		ptype = ntohs(phdr->param_type);
8974		plen = ntohs(phdr->param_length);
8975		if (ptype == SCTP_STATE_COOKIE) {
8976			int pad;
8977
8978			/* found the cookie */
8979			if ((pad = (plen % 4))) {
8980				plen += 4 - pad;
8981			}
8982			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8983			if (cookie == NULL) {
8984				/* No memory */
8985				return (-2);
8986			}
8987#ifdef SCTP_MBUF_LOGGING
8988			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8989				struct mbuf *mat;
8990
8991				for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8992					if (SCTP_BUF_IS_EXTENDED(mat)) {
8993						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8994					}
8995				}
8996			}
8997#endif
8998			break;
8999		}
9000		at += SCTP_SIZE32(plen);
9001	} while (phdr);
9002	if (cookie == NULL) {
9003		/* Did not find the cookie */
9004		return (-3);
9005	}
9006	/* ok, we got the cookie lets change it into a cookie echo chunk */
9007
9008	/* first the change from param to cookie */
9009	hdr = mtod(cookie, struct sctp_chunkhdr *);
9010	hdr->chunk_type = SCTP_COOKIE_ECHO;
9011	hdr->chunk_flags = 0;
9012	/* get the chunk stuff now and place it in the FRONT of the queue */
9013	sctp_alloc_a_chunk(stcb, chk);
9014	if (chk == NULL) {
9015		/* no memory */
9016		sctp_m_freem(cookie);
9017		return (-5);
9018	}
9019	chk->copy_by_ref = 0;
9020	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9021	chk->rec.chunk_id.can_take_data = 0;
9022	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9023	chk->send_size = plen;
9024	chk->sent = SCTP_DATAGRAM_UNSENT;
9025	chk->snd_count = 0;
9026	chk->asoc = &stcb->asoc;
9027	chk->data = cookie;
9028	chk->whoTo = net;
9029	atomic_add_int(&chk->whoTo->ref_count, 1);
9030	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9031	chk->asoc->ctrl_queue_cnt++;
9032	return (0);
9033}
9034
9035void
9036sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9037    struct mbuf *m,
9038    int offset,
9039    int chk_length,
9040    struct sctp_nets *net)
9041{
9042	/*
9043	 * take a HB request and make it into a HB ack and send it.
9044	 */
9045	struct mbuf *outchain;
9046	struct sctp_chunkhdr *chdr;
9047	struct sctp_tmit_chunk *chk;
9048
9049
9050	if (net == NULL)
9051		/* must have a net pointer */
9052		return;
9053
9054	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9055	if (outchain == NULL) {
9056		/* gak out of memory */
9057		return;
9058	}
9059#ifdef SCTP_MBUF_LOGGING
9060	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9061		struct mbuf *mat;
9062
9063		for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9064			if (SCTP_BUF_IS_EXTENDED(mat)) {
9065				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9066			}
9067		}
9068	}
9069#endif
9070	chdr = mtod(outchain, struct sctp_chunkhdr *);
9071	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9072	chdr->chunk_flags = 0;
9073	if (chk_length % 4) {
9074		/* need pad */
9075		uint32_t cpthis = 0;
9076		int padlen;
9077
9078		padlen = 4 - (chk_length % 4);
9079		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9080	}
9081	sctp_alloc_a_chunk(stcb, chk);
9082	if (chk == NULL) {
9083		/* no memory */
9084		sctp_m_freem(outchain);
9085		return;
9086	}
9087	chk->copy_by_ref = 0;
9088	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9089	chk->rec.chunk_id.can_take_data = 1;
9090	chk->flags = 0;
9091	chk->send_size = chk_length;
9092	chk->sent = SCTP_DATAGRAM_UNSENT;
9093	chk->snd_count = 0;
9094	chk->asoc = &stcb->asoc;
9095	chk->data = outchain;
9096	chk->whoTo = net;
9097	atomic_add_int(&chk->whoTo->ref_count, 1);
9098	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9099	chk->asoc->ctrl_queue_cnt++;
9100}
9101
9102void
9103sctp_send_cookie_ack(struct sctp_tcb *stcb)
9104{
9105	/* formulate and queue a cookie-ack back to sender */
9106	struct mbuf *cookie_ack;
9107	struct sctp_chunkhdr *hdr;
9108	struct sctp_tmit_chunk *chk;
9109
9110	SCTP_TCB_LOCK_ASSERT(stcb);
9111
9112	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9113	if (cookie_ack == NULL) {
9114		/* no mbuf's */
9115		return;
9116	}
9117	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9118	sctp_alloc_a_chunk(stcb, chk);
9119	if (chk == NULL) {
9120		/* no memory */
9121		sctp_m_freem(cookie_ack);
9122		return;
9123	}
9124	chk->copy_by_ref = 0;
9125	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9126	chk->rec.chunk_id.can_take_data = 1;
9127	chk->flags = 0;
9128	chk->send_size = sizeof(struct sctp_chunkhdr);
9129	chk->sent = SCTP_DATAGRAM_UNSENT;
9130	chk->snd_count = 0;
9131	chk->asoc = &stcb->asoc;
9132	chk->data = cookie_ack;
9133	if (chk->asoc->last_control_chunk_from != NULL) {
9134		chk->whoTo = chk->asoc->last_control_chunk_from;
9135		atomic_add_int(&chk->whoTo->ref_count, 1);
9136	} else {
9137		chk->whoTo = NULL;
9138	}
9139	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9140	hdr->chunk_type = SCTP_COOKIE_ACK;
9141	hdr->chunk_flags = 0;
9142	hdr->chunk_length = htons(chk->send_size);
9143	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9144	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9145	chk->asoc->ctrl_queue_cnt++;
9146	return;
9147}
9148
9149
9150void
9151sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9152{
9153	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9154	struct mbuf *m_shutdown_ack;
9155	struct sctp_shutdown_ack_chunk *ack_cp;
9156	struct sctp_tmit_chunk *chk;
9157
9158	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9159	if (m_shutdown_ack == NULL) {
9160		/* no mbuf's */
9161		return;
9162	}
9163	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9164	sctp_alloc_a_chunk(stcb, chk);
9165	if (chk == NULL) {
9166		/* no memory */
9167		sctp_m_freem(m_shutdown_ack);
9168		return;
9169	}
9170	chk->copy_by_ref = 0;
9171	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9172	chk->rec.chunk_id.can_take_data = 1;
9173	chk->flags = 0;
9174	chk->send_size = sizeof(struct sctp_chunkhdr);
9175	chk->sent = SCTP_DATAGRAM_UNSENT;
9176	chk->snd_count = 0;
9177	chk->flags = 0;
9178	chk->asoc = &stcb->asoc;
9179	chk->data = m_shutdown_ack;
9180	chk->whoTo = net;
9181	if (chk->whoTo) {
9182		atomic_add_int(&chk->whoTo->ref_count, 1);
9183	}
9184	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9185	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9186	ack_cp->ch.chunk_flags = 0;
9187	ack_cp->ch.chunk_length = htons(chk->send_size);
9188	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9189	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9190	chk->asoc->ctrl_queue_cnt++;
9191	return;
9192}
9193
9194void
9195sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9196{
9197	/* formulate and queue a SHUTDOWN to the sender */
9198	struct mbuf *m_shutdown;
9199	struct sctp_shutdown_chunk *shutdown_cp;
9200	struct sctp_tmit_chunk *chk;
9201
9202	m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9203	if (m_shutdown == NULL) {
9204		/* no mbuf's */
9205		return;
9206	}
9207	SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9208	sctp_alloc_a_chunk(stcb, chk);
9209	if (chk == NULL) {
9210		/* no memory */
9211		sctp_m_freem(m_shutdown);
9212		return;
9213	}
9214	chk->copy_by_ref = 0;
9215	chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9216	chk->rec.chunk_id.can_take_data = 1;
9217	chk->flags = 0;
9218	chk->send_size = sizeof(struct sctp_shutdown_chunk);
9219	chk->sent = SCTP_DATAGRAM_UNSENT;
9220	chk->snd_count = 0;
9221	chk->flags = 0;
9222	chk->asoc = &stcb->asoc;
9223	chk->data = m_shutdown;
9224	chk->whoTo = net;
9225	if (chk->whoTo) {
9226		atomic_add_int(&chk->whoTo->ref_count, 1);
9227	}
9228	shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9229	shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9230	shutdown_cp->ch.chunk_flags = 0;
9231	shutdown_cp->ch.chunk_length = htons(chk->send_size);
9232	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9233	SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9234	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9235	chk->asoc->ctrl_queue_cnt++;
9236	return;
9237}
9238
9239void
9240sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9241{
9242	/*
9243	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9244	 * should be queued on the assoc queue.
9245	 */
9246	struct sctp_tmit_chunk *chk;
9247	struct mbuf *m_asconf;
9248	int len;
9249
9250	SCTP_TCB_LOCK_ASSERT(stcb);
9251
9252	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9253	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9254		/* can't send a new one if there is one in flight already */
9255		return;
9256	}
9257	/* compose an ASCONF chunk, maximum length is PMTU */
9258	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9259	if (m_asconf == NULL) {
9260		return;
9261	}
9262	sctp_alloc_a_chunk(stcb, chk);
9263	if (chk == NULL) {
9264		/* no memory */
9265		sctp_m_freem(m_asconf);
9266		return;
9267	}
9268	chk->copy_by_ref = 0;
9269	chk->rec.chunk_id.id = SCTP_ASCONF;
9270	chk->rec.chunk_id.can_take_data = 0;
9271	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9272	chk->data = m_asconf;
9273	chk->send_size = len;
9274	chk->sent = SCTP_DATAGRAM_UNSENT;
9275	chk->snd_count = 0;
9276	chk->asoc = &stcb->asoc;
9277	chk->whoTo = net;
9278	if (chk->whoTo) {
9279		atomic_add_int(&chk->whoTo->ref_count, 1);
9280	}
9281	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9282	chk->asoc->ctrl_queue_cnt++;
9283	return;
9284}
9285
9286void
9287sctp_send_asconf_ack(struct sctp_tcb *stcb)
9288{
9289	/*
9290	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9291	 * must be stored in the tcb.
9292	 */
9293	struct sctp_tmit_chunk *chk;
9294	struct sctp_asconf_ack *ack, *latest_ack;
9295	struct mbuf *m_ack;
9296	struct sctp_nets *net = NULL;
9297
9298	SCTP_TCB_LOCK_ASSERT(stcb);
9299	/* Get the latest ASCONF-ACK */
9300	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9301	if (latest_ack == NULL) {
9302		return;
9303	}
9304	if (latest_ack->last_sent_to != NULL &&
9305	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9306		/* we're doing a retransmission */
9307		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9308		if (net == NULL) {
9309			/* no alternate */
9310			if (stcb->asoc.last_control_chunk_from == NULL) {
9311				if (stcb->asoc.alternate) {
9312					net = stcb->asoc.alternate;
9313				} else {
9314					net = stcb->asoc.primary_destination;
9315				}
9316			} else {
9317				net = stcb->asoc.last_control_chunk_from;
9318			}
9319		}
9320	} else {
9321		/* normal case */
9322		if (stcb->asoc.last_control_chunk_from == NULL) {
9323			if (stcb->asoc.alternate) {
9324				net = stcb->asoc.alternate;
9325			} else {
9326				net = stcb->asoc.primary_destination;
9327			}
9328		} else {
9329			net = stcb->asoc.last_control_chunk_from;
9330		}
9331	}
9332	latest_ack->last_sent_to = net;
9333
9334	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9335		if (ack->data == NULL) {
9336			continue;
9337		}
9338		/* copy the asconf_ack */
9339		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9340		if (m_ack == NULL) {
9341			/* couldn't copy it */
9342			return;
9343		}
9344#ifdef SCTP_MBUF_LOGGING
9345		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9346			struct mbuf *mat;
9347
9348			for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9349				if (SCTP_BUF_IS_EXTENDED(mat)) {
9350					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9351				}
9352			}
9353		}
9354#endif
9355
9356		sctp_alloc_a_chunk(stcb, chk);
9357		if (chk == NULL) {
9358			/* no memory */
9359			if (m_ack)
9360				sctp_m_freem(m_ack);
9361			return;
9362		}
9363		chk->copy_by_ref = 0;
9364		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9365		chk->rec.chunk_id.can_take_data = 1;
9366		chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9367		chk->whoTo = net;
9368		if (chk->whoTo) {
9369			atomic_add_int(&chk->whoTo->ref_count, 1);
9370		}
9371		chk->data = m_ack;
9372		chk->send_size = 0;
9373		/* Get size */
9374		chk->send_size = ack->len;
9375		chk->sent = SCTP_DATAGRAM_UNSENT;
9376		chk->snd_count = 0;
9377		chk->asoc = &stcb->asoc;
9378
9379		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9380		chk->asoc->ctrl_queue_cnt++;
9381	}
9382	return;
9383}
9384
9385
9386static int
9387sctp_chunk_retransmission(struct sctp_inpcb *inp,
9388    struct sctp_tcb *stcb,
9389    struct sctp_association *asoc,
9390    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9391#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9392    SCTP_UNUSED
9393#endif
9394)
9395{
9396	/*-
9397	 * send out one MTU of retransmission. If fast_retransmit is
9398	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9399	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9400	 * retransmit them by themselves.
9401	 *
9402	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9403	 * marked for resend and bundle them all together (up to a MTU of
9404	 * destination). The address to send to should have been
9405	 * selected/changed where the retransmission was marked (i.e. in FR
9406	 * or t3-timeout routines).
9407	 */
9408	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9409	struct sctp_tmit_chunk *chk, *fwd;
9410	struct mbuf *m, *endofchain;
9411	struct sctp_nets *net = NULL;
9412	uint32_t tsns_sent = 0;
9413	int no_fragmentflg, bundle_at, cnt_thru;
9414	unsigned int mtu;
9415	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9416	struct sctp_auth_chunk *auth = NULL;
9417	uint32_t auth_offset = 0;
9418	uint16_t auth_keyid;
9419	int override_ok = 1;
9420	int data_auth_reqd = 0;
9421	uint32_t dmtu = 0;
9422
9423	SCTP_TCB_LOCK_ASSERT(stcb);
9424	tmr_started = ctl_cnt = bundle_at = error = 0;
9425	no_fragmentflg = 1;
9426	fwd_tsn = 0;
9427	*cnt_out = 0;
9428	fwd = NULL;
9429	endofchain = m = NULL;
9430	auth_keyid = stcb->asoc.authinfo.active_keyid;
9431#ifdef SCTP_AUDITING_ENABLED
9432	sctp_audit_log(0xC3, 1);
9433#endif
9434	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9435	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9436		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9437		    asoc->sent_queue_retran_cnt);
9438		asoc->sent_queue_cnt = 0;
9439		asoc->sent_queue_cnt_removeable = 0;
9440		/* send back 0/0 so we enter normal transmission */
9441		*cnt_out = 0;
9442		return (0);
9443	}
9444	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9445		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9446		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9447		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9448			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9449				continue;
9450			}
9451			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9452				if (chk != asoc->str_reset) {
9453					/*
9454					 * not eligible for retran if its
9455					 * not ours
9456					 */
9457					continue;
9458				}
9459			}
9460			ctl_cnt++;
9461			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9462				fwd_tsn = 1;
9463			}
9464			/*
9465			 * Add an AUTH chunk, if chunk requires it save the
9466			 * offset into the chain for AUTH
9467			 */
9468			if ((auth == NULL) &&
9469			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9470			    stcb->asoc.peer_auth_chunks))) {
9471				m = sctp_add_auth_chunk(m, &endofchain,
9472				    &auth, &auth_offset,
9473				    stcb,
9474				    chk->rec.chunk_id.id);
9475				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9476			}
9477			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9478			break;
9479		}
9480	}
9481	one_chunk = 0;
9482	cnt_thru = 0;
9483	/* do we have control chunks to retransmit? */
9484	if (m != NULL) {
9485		/* Start a timer no matter if we suceed or fail */
9486		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9487			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9488		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9489			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9490		chk->snd_count++;	/* update our count */
9491		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9492		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9493		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9494		    no_fragmentflg, 0, 0,
9495		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9496		    chk->whoTo->port, NULL,
9497		    0, 0,
9498		    so_locked))) {
9499			SCTP_STAT_INCR(sctps_lowlevelerr);
9500			return (error);
9501		}
9502		endofchain = NULL;
9503		auth = NULL;
9504		auth_offset = 0;
9505		/*
9506		 * We don't want to mark the net->sent time here since this
9507		 * we use this for HB and retrans cannot measure RTT
9508		 */
9509		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9510		*cnt_out += 1;
9511		chk->sent = SCTP_DATAGRAM_SENT;
9512		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9513		if (fwd_tsn == 0) {
9514			return (0);
9515		} else {
9516			/* Clean up the fwd-tsn list */
9517			sctp_clean_up_ctl(stcb, asoc, so_locked);
9518			return (0);
9519		}
9520	}
9521	/*
9522	 * Ok, it is just data retransmission we need to do or that and a
9523	 * fwd-tsn with it all.
9524	 */
9525	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9526		return (SCTP_RETRAN_DONE);
9527	}
9528	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9529	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9530		/* not yet open, resend the cookie and that is it */
9531		return (1);
9532	}
9533#ifdef SCTP_AUDITING_ENABLED
9534	sctp_auditing(20, inp, stcb, NULL);
9535#endif
9536	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9537	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9538		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9539			/* No, not sent to this net or not ready for rtx */
9540			continue;
9541		}
9542		if (chk->data == NULL) {
9543			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9544			    chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9545			continue;
9546		}
9547		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9548		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9549			/* Gak, we have exceeded max unlucky retran, abort! */
9550			SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9551			    chk->snd_count,
9552			    SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9553			atomic_add_int(&stcb->asoc.refcnt, 1);
9554			sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9555			SCTP_TCB_LOCK(stcb);
9556			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9557			return (SCTP_RETRAN_EXIT);
9558		}
9559		/* pick up the net */
9560		net = chk->whoTo;
9561		switch (net->ro._l_addr.sa.sa_family) {
9562#ifdef INET
9563		case AF_INET:
9564			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9565			break;
9566#endif
9567#ifdef INET6
9568		case AF_INET6:
9569			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9570			break;
9571#endif
9572		default:
9573			/* TSNH */
9574			mtu = net->mtu;
9575			break;
9576		}
9577
9578		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9579			/* No room in peers rwnd */
9580			uint32_t tsn;
9581
9582			tsn = asoc->last_acked_seq + 1;
9583			if (tsn == chk->rec.data.TSN_seq) {
9584				/*
9585				 * we make a special exception for this
9586				 * case. The peer has no rwnd but is missing
9587				 * the lowest chunk.. which is probably what
9588				 * is holding up the rwnd.
9589				 */
9590				goto one_chunk_around;
9591			}
9592			return (1);
9593		}
9594one_chunk_around:
9595		if (asoc->peers_rwnd < mtu) {
9596			one_chunk = 1;
9597			if ((asoc->peers_rwnd == 0) &&
9598			    (asoc->total_flight == 0)) {
9599				chk->window_probe = 1;
9600				chk->whoTo->window_probe = 1;
9601			}
9602		}
9603#ifdef SCTP_AUDITING_ENABLED
9604		sctp_audit_log(0xC3, 2);
9605#endif
9606		bundle_at = 0;
9607		m = NULL;
9608		net->fast_retran_ip = 0;
9609		if (chk->rec.data.doing_fast_retransmit == 0) {
9610			/*
9611			 * if no FR in progress skip destination that have
9612			 * flight_size > cwnd.
9613			 */
9614			if (net->flight_size >= net->cwnd) {
9615				continue;
9616			}
9617		} else {
9618			/*
9619			 * Mark the destination net to have FR recovery
9620			 * limits put on it.
9621			 */
9622			*fr_done = 1;
9623			net->fast_retran_ip = 1;
9624		}
9625
9626		/*
9627		 * if no AUTH is yet included and this chunk requires it,
9628		 * make sure to account for it.  We don't apply the size
9629		 * until the AUTH chunk is actually added below in case
9630		 * there is no room for this chunk.
9631		 */
9632		if (data_auth_reqd && (auth == NULL)) {
9633			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9634		} else
9635			dmtu = 0;
9636
9637		if ((chk->send_size <= (mtu - dmtu)) ||
9638		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9639			/* ok we will add this one */
9640			if (data_auth_reqd) {
9641				if (auth == NULL) {
9642					m = sctp_add_auth_chunk(m,
9643					    &endofchain,
9644					    &auth,
9645					    &auth_offset,
9646					    stcb,
9647					    SCTP_DATA);
9648					auth_keyid = chk->auth_keyid;
9649					override_ok = 0;
9650					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9651				} else if (override_ok) {
9652					auth_keyid = chk->auth_keyid;
9653					override_ok = 0;
9654				} else if (chk->auth_keyid != auth_keyid) {
9655					/* different keyid, so done bundling */
9656					break;
9657				}
9658			}
9659			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9660			if (m == NULL) {
9661				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9662				return (ENOMEM);
9663			}
9664			/* Do clear IP_DF ? */
9665			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9666				no_fragmentflg = 0;
9667			}
9668			/* upate our MTU size */
9669			if (mtu > (chk->send_size + dmtu))
9670				mtu -= (chk->send_size + dmtu);
9671			else
9672				mtu = 0;
9673			data_list[bundle_at++] = chk;
9674			if (one_chunk && (asoc->total_flight <= 0)) {
9675				SCTP_STAT_INCR(sctps_windowprobed);
9676			}
9677		}
9678		if (one_chunk == 0) {
9679			/*
9680			 * now are there anymore forward from chk to pick
9681			 * up?
9682			 */
9683			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9684				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9685					/* Nope, not for retran */
9686					continue;
9687				}
9688				if (fwd->whoTo != net) {
9689					/* Nope, not the net in question */
9690					continue;
9691				}
9692				if (data_auth_reqd && (auth == NULL)) {
9693					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9694				} else
9695					dmtu = 0;
9696				if (fwd->send_size <= (mtu - dmtu)) {
9697					if (data_auth_reqd) {
9698						if (auth == NULL) {
9699							m = sctp_add_auth_chunk(m,
9700							    &endofchain,
9701							    &auth,
9702							    &auth_offset,
9703							    stcb,
9704							    SCTP_DATA);
9705							auth_keyid = fwd->auth_keyid;
9706							override_ok = 0;
9707							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9708						} else if (override_ok) {
9709							auth_keyid = fwd->auth_keyid;
9710							override_ok = 0;
9711						} else if (fwd->auth_keyid != auth_keyid) {
9712							/*
9713							 * different keyid,
9714							 * so done bundling
9715							 */
9716							break;
9717						}
9718					}
9719					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9720					if (m == NULL) {
9721						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9722						return (ENOMEM);
9723					}
9724					/* Do clear IP_DF ? */
9725					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9726						no_fragmentflg = 0;
9727					}
9728					/* upate our MTU size */
9729					if (mtu > (fwd->send_size + dmtu))
9730						mtu -= (fwd->send_size + dmtu);
9731					else
9732						mtu = 0;
9733					data_list[bundle_at++] = fwd;
9734					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9735						break;
9736					}
9737				} else {
9738					/* can't fit so we are done */
9739					break;
9740				}
9741			}
9742		}
9743		/* Is there something to send for this destination? */
9744		if (m) {
9745			/*
9746			 * No matter if we fail/or suceed we should start a
9747			 * timer. A failure is like a lost IP packet :-)
9748			 */
9749			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9750				/*
9751				 * no timer running on this destination
9752				 * restart it.
9753				 */
9754				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9755				tmr_started = 1;
9756			}
9757			/* Now lets send it, if there is anything to send :> */
9758			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9759			    (struct sockaddr *)&net->ro._l_addr, m,
9760			    auth_offset, auth, auth_keyid,
9761			    no_fragmentflg, 0, 0,
9762			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9763			    net->port, NULL,
9764			    0, 0,
9765			    so_locked))) {
9766				/* error, we could not output */
9767				SCTP_STAT_INCR(sctps_lowlevelerr);
9768				return (error);
9769			}
9770			endofchain = NULL;
9771			auth = NULL;
9772			auth_offset = 0;
9773			/* For HB's */
9774			/*
9775			 * We don't want to mark the net->sent time here
9776			 * since this we use this for HB and retrans cannot
9777			 * measure RTT
9778			 */
9779			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9780
9781			/* For auto-close */
9782			cnt_thru++;
9783			if (*now_filled == 0) {
9784				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9785				*now = asoc->time_last_sent;
9786				*now_filled = 1;
9787			} else {
9788				asoc->time_last_sent = *now;
9789			}
9790			*cnt_out += bundle_at;
9791#ifdef SCTP_AUDITING_ENABLED
9792			sctp_audit_log(0xC4, bundle_at);
9793#endif
9794			if (bundle_at) {
9795				tsns_sent = data_list[0]->rec.data.TSN_seq;
9796			}
9797			for (i = 0; i < bundle_at; i++) {
9798				SCTP_STAT_INCR(sctps_sendretransdata);
9799				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9800				/*
9801				 * When we have a revoked data, and we
9802				 * retransmit it, then we clear the revoked
9803				 * flag since this flag dictates if we
9804				 * subtracted from the fs
9805				 */
9806				if (data_list[i]->rec.data.chunk_was_revoked) {
9807					/* Deflate the cwnd */
9808					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9809					data_list[i]->rec.data.chunk_was_revoked = 0;
9810				}
9811				data_list[i]->snd_count++;
9812				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9813				/* record the time */
9814				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9815				if (data_list[i]->book_size_scale) {
9816					/*
9817					 * need to double the book size on
9818					 * this one
9819					 */
9820					data_list[i]->book_size_scale = 0;
9821					/*
9822					 * Since we double the booksize, we
9823					 * must also double the output queue
9824					 * size, since this get shrunk when
9825					 * we free by this amount.
9826					 */
9827					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9828					data_list[i]->book_size *= 2;
9829
9830
9831				} else {
9832					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9833						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9834						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9835					}
9836					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9837					    (uint32_t) (data_list[i]->send_size +
9838					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9839				}
9840				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9841					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9842					    data_list[i]->whoTo->flight_size,
9843					    data_list[i]->book_size,
9844					    (uintptr_t) data_list[i]->whoTo,
9845					    data_list[i]->rec.data.TSN_seq);
9846				}
9847				sctp_flight_size_increase(data_list[i]);
9848				sctp_total_flight_increase(stcb, data_list[i]);
9849				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9850					/* SWS sender side engages */
9851					asoc->peers_rwnd = 0;
9852				}
9853				if ((i == 0) &&
9854				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9855					SCTP_STAT_INCR(sctps_sendfastretrans);
9856					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9857					    (tmr_started == 0)) {
9858						/*-
9859						 * ok we just fast-retrans'd
9860						 * the lowest TSN, i.e the
9861						 * first on the list. In
9862						 * this case we want to give
9863						 * some more time to get a
9864						 * SACK back without a
9865						 * t3-expiring.
9866						 */
9867						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9868						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9869						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9870					}
9871				}
9872			}
9873			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9874				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9875			}
9876#ifdef SCTP_AUDITING_ENABLED
9877			sctp_auditing(21, inp, stcb, NULL);
9878#endif
9879		} else {
9880			/* None will fit */
9881			return (1);
9882		}
9883		if (asoc->sent_queue_retran_cnt <= 0) {
9884			/* all done we have no more to retran */
9885			asoc->sent_queue_retran_cnt = 0;
9886			break;
9887		}
9888		if (one_chunk) {
9889			/* No more room in rwnd */
9890			return (1);
9891		}
9892		/* stop the for loop here. we sent out a packet */
9893		break;
9894	}
9895	return (0);
9896}
9897
9898static void
9899sctp_timer_validation(struct sctp_inpcb *inp,
9900    struct sctp_tcb *stcb,
9901    struct sctp_association *asoc)
9902{
9903	struct sctp_nets *net;
9904
9905	/* Validate that a timer is running somewhere */
9906	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9907		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9908			/* Here is a timer */
9909			return;
9910		}
9911	}
9912	SCTP_TCB_LOCK_ASSERT(stcb);
9913	/* Gak, we did not have a timer somewhere */
9914	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9915	if (asoc->alternate) {
9916		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9917	} else {
9918		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9919	}
9920	return;
9921}
9922
9923void
9924sctp_chunk_output(struct sctp_inpcb *inp,
9925    struct sctp_tcb *stcb,
9926    int from_where,
9927    int so_locked
9928#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9929    SCTP_UNUSED
9930#endif
9931)
9932{
9933	/*-
9934	 * Ok this is the generic chunk service queue. we must do the
9935	 * following:
9936	 * - See if there are retransmits pending, if so we must
9937	 *   do these first.
9938	 * - Service the stream queue that is next, moving any
9939	 *   message (note I must get a complete message i.e.
9940	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9941	 *   TSN's
9942	 * - Check to see if the cwnd/rwnd allows any output, if so we
9943	 *   go ahead and fomulate and send the low level chunks. Making sure
9944	 *   to combine any control in the control chunk queue also.
9945	 */
9946	struct sctp_association *asoc;
9947	struct sctp_nets *net;
9948	int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9949	unsigned int burst_cnt = 0;
9950	struct timeval now;
9951	int now_filled = 0;
9952	int nagle_on;
9953	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9954	int un_sent = 0;
9955	int fr_done;
9956	unsigned int tot_frs = 0;
9957
9958	asoc = &stcb->asoc;
9959	/* The Nagle algorithm is only applied when handling a send call. */
9960	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9961		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9962			nagle_on = 0;
9963		} else {
9964			nagle_on = 1;
9965		}
9966	} else {
9967		nagle_on = 0;
9968	}
9969	SCTP_TCB_LOCK_ASSERT(stcb);
9970
9971	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9972
9973	if ((un_sent <= 0) &&
9974	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9975	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9976	    (asoc->sent_queue_retran_cnt == 0)) {
9977		/* Nothing to do unless there is something to be sent left */
9978		return;
9979	}
9980	/*
9981	 * Do we have something to send, data or control AND a sack timer
9982	 * running, if so piggy-back the sack.
9983	 */
9984	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9985		sctp_send_sack(stcb, so_locked);
9986		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9987	}
9988	while (asoc->sent_queue_retran_cnt) {
9989		/*-
9990		 * Ok, it is retransmission time only, we send out only ONE
9991		 * packet with a single call off to the retran code.
9992		 */
9993		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9994			/*-
9995			 * Special hook for handling cookiess discarded
9996			 * by peer that carried data. Send cookie-ack only
9997			 * and then the next call with get the retran's.
9998			 */
9999			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10000			    from_where,
10001			    &now, &now_filled, frag_point, so_locked);
10002			return;
10003		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10004			/* if its not from a HB then do it */
10005			fr_done = 0;
10006			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10007			if (fr_done) {
10008				tot_frs++;
10009			}
10010		} else {
10011			/*
10012			 * its from any other place, we don't allow retran
10013			 * output (only control)
10014			 */
10015			ret = 1;
10016		}
10017		if (ret > 0) {
10018			/* Can't send anymore */
10019			/*-
10020			 * now lets push out control by calling med-level
10021			 * output once. this assures that we WILL send HB's
10022			 * if queued too.
10023			 */
10024			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10025			    from_where,
10026			    &now, &now_filled, frag_point, so_locked);
10027#ifdef SCTP_AUDITING_ENABLED
10028			sctp_auditing(8, inp, stcb, NULL);
10029#endif
10030			sctp_timer_validation(inp, stcb, asoc);
10031			return;
10032		}
10033		if (ret < 0) {
10034			/*-
10035			 * The count was off.. retran is not happening so do
10036			 * the normal retransmission.
10037			 */
10038#ifdef SCTP_AUDITING_ENABLED
10039			sctp_auditing(9, inp, stcb, NULL);
10040#endif
10041			if (ret == SCTP_RETRAN_EXIT) {
10042				return;
10043			}
10044			break;
10045		}
10046		if (from_where == SCTP_OUTPUT_FROM_T3) {
10047			/* Only one transmission allowed out of a timeout */
10048#ifdef SCTP_AUDITING_ENABLED
10049			sctp_auditing(10, inp, stcb, NULL);
10050#endif
10051			/* Push out any control */
10052			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10053			    &now, &now_filled, frag_point, so_locked);
10054			return;
10055		}
10056		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10057			/* Hit FR burst limit */
10058			return;
10059		}
10060		if ((num_out == 0) && (ret == 0)) {
10061			/* No more retrans to send */
10062			break;
10063		}
10064	}
10065#ifdef SCTP_AUDITING_ENABLED
10066	sctp_auditing(12, inp, stcb, NULL);
10067#endif
10068	/* Check for bad destinations, if they exist move chunks around. */
10069	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10070		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10071			/*-
10072			 * if possible move things off of this address we
10073			 * still may send below due to the dormant state but
10074			 * we try to find an alternate address to send to
10075			 * and if we have one we move all queued data on the
10076			 * out wheel to this alternate address.
10077			 */
10078			if (net->ref_count > 1)
10079				sctp_move_chunks_from_net(stcb, net);
10080		} else {
10081			/*-
10082			 * if ((asoc->sat_network) || (net->addr_is_local))
10083			 * { burst_limit = asoc->max_burst *
10084			 * SCTP_SAT_NETWORK_BURST_INCR; }
10085			 */
10086			if (asoc->max_burst > 0) {
10087				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10088					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10089						/*
10090						 * JRS - Use the congestion
10091						 * control given in the
10092						 * congestion control module
10093						 */
10094						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10095						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10096							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10097						}
10098						SCTP_STAT_INCR(sctps_maxburstqueued);
10099					}
10100					net->fast_retran_ip = 0;
10101				} else {
10102					if (net->flight_size == 0) {
10103						/*
10104						 * Should be decaying the
10105						 * cwnd here
10106						 */
10107						;
10108					}
10109				}
10110			}
10111		}
10112
10113	}
10114	burst_cnt = 0;
10115	do {
10116		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10117		    &reason_code, 0, from_where,
10118		    &now, &now_filled, frag_point, so_locked);
10119		if (error) {
10120			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10121			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10122				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10123			}
10124			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10125				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10126				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10127			}
10128			break;
10129		}
10130		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10131
10132		tot_out += num_out;
10133		burst_cnt++;
10134		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10135			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10136			if (num_out == 0) {
10137				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10138			}
10139		}
10140		if (nagle_on) {
10141			/*
10142			 * When the Nagle algorithm is used, look at how
10143			 * much is unsent, then if its smaller than an MTU
10144			 * and we have data in flight we stop, except if we
10145			 * are handling a fragmented user message.
10146			 */
10147			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10148			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10149			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10150			    (stcb->asoc.total_flight > 0) &&
10151			    ((stcb->asoc.locked_on_sending == NULL) ||
10152			    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10153				break;
10154			}
10155		}
10156		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10157		    TAILQ_EMPTY(&asoc->send_queue) &&
10158		    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10159			/* Nothing left to send */
10160			break;
10161		}
10162		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10163			/* Nothing left to send */
10164			break;
10165		}
10166	} while (num_out &&
10167	    ((asoc->max_burst == 0) ||
10168	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10169	    (burst_cnt < asoc->max_burst)));
10170
10171	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10172		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10173			SCTP_STAT_INCR(sctps_maxburstqueued);
10174			asoc->burst_limit_applied = 1;
10175			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10176				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10177			}
10178		} else {
10179			asoc->burst_limit_applied = 0;
10180		}
10181	}
10182	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10183		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10184	}
10185	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10186	    tot_out);
10187
10188	/*-
10189	 * Now we need to clean up the control chunk chain if a ECNE is on
10190	 * it. It must be marked as UNSENT again so next call will continue
10191	 * to send it until such time that we get a CWR, to remove it.
10192	 */
10193	if (stcb->asoc.ecn_echo_cnt_onq)
10194		sctp_fix_ecn_echo(asoc);
10195	return;
10196}
10197
10198
10199int
10200sctp_output(
10201    struct sctp_inpcb *inp,
10202    struct mbuf *m,
10203    struct sockaddr *addr,
10204    struct mbuf *control,
10205    struct thread *p,
10206    int flags)
10207{
10208	if (inp == NULL) {
10209		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10210		return (EINVAL);
10211	}
10212	if (inp->sctp_socket == NULL) {
10213		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10214		return (EINVAL);
10215	}
10216	return (sctp_sosend(inp->sctp_socket,
10217	    addr,
10218	    (struct uio *)NULL,
10219	    m,
10220	    control,
10221	    flags, p
10222	    ));
10223}
10224
10225void
10226send_forward_tsn(struct sctp_tcb *stcb,
10227    struct sctp_association *asoc)
10228{
10229	struct sctp_tmit_chunk *chk;
10230	struct sctp_forward_tsn_chunk *fwdtsn;
10231	uint32_t advance_peer_ack_point;
10232
10233	SCTP_TCB_LOCK_ASSERT(stcb);
10234	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10235		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10236			/* mark it to unsent */
10237			chk->sent = SCTP_DATAGRAM_UNSENT;
10238			chk->snd_count = 0;
10239			/* Do we correct its output location? */
10240			if (chk->whoTo) {
10241				sctp_free_remote_addr(chk->whoTo);
10242				chk->whoTo = NULL;
10243			}
10244			goto sctp_fill_in_rest;
10245		}
10246	}
10247	/* Ok if we reach here we must build one */
10248	sctp_alloc_a_chunk(stcb, chk);
10249	if (chk == NULL) {
10250		return;
10251	}
10252	asoc->fwd_tsn_cnt++;
10253	chk->copy_by_ref = 0;
10254	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10255	chk->rec.chunk_id.can_take_data = 0;
10256	chk->flags = 0;
10257	chk->asoc = asoc;
10258	chk->whoTo = NULL;
10259	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10260	if (chk->data == NULL) {
10261		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10262		return;
10263	}
10264	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10265	chk->sent = SCTP_DATAGRAM_UNSENT;
10266	chk->snd_count = 0;
10267	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10268	asoc->ctrl_queue_cnt++;
10269sctp_fill_in_rest:
10270	/*-
10271	 * Here we go through and fill out the part that deals with
10272	 * stream/seq of the ones we skip.
10273	 */
10274	SCTP_BUF_LEN(chk->data) = 0;
10275	{
10276		struct sctp_tmit_chunk *at, *tp1, *last;
10277		struct sctp_strseq *strseq;
10278		unsigned int cnt_of_space, i, ovh;
10279		unsigned int space_needed;
10280		unsigned int cnt_of_skipped = 0;
10281
10282		TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10283			if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10284			    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10285				/* no more to look at */
10286				break;
10287			}
10288			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10289				/* We don't report these */
10290				continue;
10291			}
10292			cnt_of_skipped++;
10293		}
10294		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10295		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10296
10297		cnt_of_space = M_TRAILINGSPACE(chk->data);
10298
10299		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10300			ovh = SCTP_MIN_OVERHEAD;
10301		} else {
10302			ovh = SCTP_MIN_V4_OVERHEAD;
10303		}
10304		if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10305			/* trim to a mtu size */
10306			cnt_of_space = asoc->smallest_mtu - ovh;
10307		}
10308		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10309			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10310			    0xff, 0, cnt_of_skipped,
10311			    asoc->advanced_peer_ack_point);
10312
10313		}
10314		advance_peer_ack_point = asoc->advanced_peer_ack_point;
10315		if (cnt_of_space < space_needed) {
10316			/*-
10317			 * ok we must trim down the chunk by lowering the
10318			 * advance peer ack point.
10319			 */
10320			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10321				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10322				    0xff, 0xff, cnt_of_space,
10323				    space_needed);
10324			}
10325			cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10326			cnt_of_skipped /= sizeof(struct sctp_strseq);
10327			/*-
10328			 * Go through and find the TSN that will be the one
10329			 * we report.
10330			 */
10331			at = TAILQ_FIRST(&asoc->sent_queue);
10332			if (at != NULL) {
10333				for (i = 0; i < cnt_of_skipped; i++) {
10334					tp1 = TAILQ_NEXT(at, sctp_next);
10335					if (tp1 == NULL) {
10336						break;
10337					}
10338					at = tp1;
10339				}
10340			}
10341			if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10342				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10343				    0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10344				    asoc->advanced_peer_ack_point);
10345			}
10346			last = at;
10347			/*-
10348			 * last now points to last one I can report, update
10349			 * peer ack point
10350			 */
10351			if (last)
10352				advance_peer_ack_point = last->rec.data.TSN_seq;
10353			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10354			    cnt_of_skipped * sizeof(struct sctp_strseq);
10355		}
10356		chk->send_size = space_needed;
10357		/* Setup the chunk */
10358		fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10359		fwdtsn->ch.chunk_length = htons(chk->send_size);
10360		fwdtsn->ch.chunk_flags = 0;
10361		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10362		fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10363		SCTP_BUF_LEN(chk->data) = chk->send_size;
10364		fwdtsn++;
10365		/*-
10366		 * Move pointer to after the fwdtsn and transfer to the
10367		 * strseq pointer.
10368		 */
10369		strseq = (struct sctp_strseq *)fwdtsn;
10370		/*-
10371		 * Now populate the strseq list. This is done blindly
10372		 * without pulling out duplicate stream info. This is
10373		 * inefficent but won't harm the process since the peer will
10374		 * look at these in sequence and will thus release anything.
10375		 * It could mean we exceed the PMTU and chop off some that
10376		 * we could have included.. but this is unlikely (aka 1432/4
10377		 * would mean 300+ stream seq's would have to be reported in
10378		 * one FWD-TSN. With a bit of work we can later FIX this to
10379		 * optimize and pull out duplcates.. but it does add more
10380		 * overhead. So for now... not!
10381		 */
10382		at = TAILQ_FIRST(&asoc->sent_queue);
10383		for (i = 0; i < cnt_of_skipped; i++) {
10384			tp1 = TAILQ_NEXT(at, sctp_next);
10385			if (tp1 == NULL)
10386				break;
10387			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10388				/* We don't report these */
10389				i--;
10390				at = tp1;
10391				continue;
10392			}
10393			if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10394				at->rec.data.fwd_tsn_cnt = 0;
10395			}
10396			strseq->stream = ntohs(at->rec.data.stream_number);
10397			strseq->sequence = ntohs(at->rec.data.stream_seq);
10398			strseq++;
10399			at = tp1;
10400		}
10401	}
10402	return;
10403}
10404
10405void
10406sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10407#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10408    SCTP_UNUSED
10409#endif
10410)
10411{
10412	/*-
10413	 * Queue up a SACK or NR-SACK in the control queue.
10414	 * We must first check to see if a SACK or NR-SACK is
10415	 * somehow on the control queue.
10416	 * If so, we will take and and remove the old one.
10417	 */
10418	struct sctp_association *asoc;
10419	struct sctp_tmit_chunk *chk, *a_chk;
10420	struct sctp_sack_chunk *sack;
10421	struct sctp_nr_sack_chunk *nr_sack;
10422	struct sctp_gap_ack_block *gap_descriptor;
10423	struct sack_track *selector;
10424	int mergeable = 0;
10425	int offset;
10426	caddr_t limit;
10427	uint32_t *dup;
10428	int limit_reached = 0;
10429	unsigned int i, siz, j;
10430	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10431	int num_dups = 0;
10432	int space_req;
10433	uint32_t highest_tsn;
10434	uint8_t flags;
10435	uint8_t type;
10436	uint8_t tsn_map;
10437
10438	if (stcb->asoc.nrsack_supported == 1) {
10439		type = SCTP_NR_SELECTIVE_ACK;
10440	} else {
10441		type = SCTP_SELECTIVE_ACK;
10442	}
10443	a_chk = NULL;
10444	asoc = &stcb->asoc;
10445	SCTP_TCB_LOCK_ASSERT(stcb);
10446	if (asoc->last_data_chunk_from == NULL) {
10447		/* Hmm we never received anything */
10448		return;
10449	}
10450	sctp_slide_mapping_arrays(stcb);
10451	sctp_set_rwnd(stcb, asoc);
10452	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10453		if (chk->rec.chunk_id.id == type) {
10454			/* Hmm, found a sack already on queue, remove it */
10455			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10456			asoc->ctrl_queue_cnt--;
10457			a_chk = chk;
10458			if (a_chk->data) {
10459				sctp_m_freem(a_chk->data);
10460				a_chk->data = NULL;
10461			}
10462			if (a_chk->whoTo) {
10463				sctp_free_remote_addr(a_chk->whoTo);
10464				a_chk->whoTo = NULL;
10465			}
10466			break;
10467		}
10468	}
10469	if (a_chk == NULL) {
10470		sctp_alloc_a_chunk(stcb, a_chk);
10471		if (a_chk == NULL) {
10472			/* No memory so we drop the idea, and set a timer */
10473			if (stcb->asoc.delayed_ack) {
10474				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10475				    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10476				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10477				    stcb->sctp_ep, stcb, NULL);
10478			} else {
10479				stcb->asoc.send_sack = 1;
10480			}
10481			return;
10482		}
10483		a_chk->copy_by_ref = 0;
10484		a_chk->rec.chunk_id.id = type;
10485		a_chk->rec.chunk_id.can_take_data = 1;
10486	}
10487	/* Clear our pkt counts */
10488	asoc->data_pkts_seen = 0;
10489
10490	a_chk->flags = 0;
10491	a_chk->asoc = asoc;
10492	a_chk->snd_count = 0;
10493	a_chk->send_size = 0;	/* fill in later */
10494	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10495	a_chk->whoTo = NULL;
10496
10497	if ((asoc->numduptsns) ||
10498	    (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10499		/*-
10500		 * Ok, we have some duplicates or the destination for the
10501		 * sack is unreachable, lets see if we can select an
10502		 * alternate than asoc->last_data_chunk_from
10503		 */
10504		if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10505		    (asoc->used_alt_onsack > asoc->numnets)) {
10506			/* We used an alt last time, don't this time */
10507			a_chk->whoTo = NULL;
10508		} else {
10509			asoc->used_alt_onsack++;
10510			a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10511		}
10512		if (a_chk->whoTo == NULL) {
10513			/* Nope, no alternate */
10514			a_chk->whoTo = asoc->last_data_chunk_from;
10515			asoc->used_alt_onsack = 0;
10516		}
10517	} else {
10518		/*
10519		 * No duplicates so we use the last place we received data
10520		 * from.
10521		 */
10522		asoc->used_alt_onsack = 0;
10523		a_chk->whoTo = asoc->last_data_chunk_from;
10524	}
10525	if (a_chk->whoTo) {
10526		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10527	}
10528	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10529		highest_tsn = asoc->highest_tsn_inside_map;
10530	} else {
10531		highest_tsn = asoc->highest_tsn_inside_nr_map;
10532	}
10533	if (highest_tsn == asoc->cumulative_tsn) {
10534		/* no gaps */
10535		if (type == SCTP_SELECTIVE_ACK) {
10536			space_req = sizeof(struct sctp_sack_chunk);
10537		} else {
10538			space_req = sizeof(struct sctp_nr_sack_chunk);
10539		}
10540	} else {
10541		/* gaps get a cluster */
10542		space_req = MCLBYTES;
10543	}
10544	/* Ok now lets formulate a MBUF with our sack */
10545	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10546	if ((a_chk->data == NULL) ||
10547	    (a_chk->whoTo == NULL)) {
10548		/* rats, no mbuf memory */
10549		if (a_chk->data) {
10550			/* was a problem with the destination */
10551			sctp_m_freem(a_chk->data);
10552			a_chk->data = NULL;
10553		}
10554		sctp_free_a_chunk(stcb, a_chk, so_locked);
10555		/* sa_ignore NO_NULL_CHK */
10556		if (stcb->asoc.delayed_ack) {
10557			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10558			    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10559			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10560			    stcb->sctp_ep, stcb, NULL);
10561		} else {
10562			stcb->asoc.send_sack = 1;
10563		}
10564		return;
10565	}
10566	/* ok, lets go through and fill it in */
10567	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10568	space = M_TRAILINGSPACE(a_chk->data);
10569	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10570		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10571	}
10572	limit = mtod(a_chk->data, caddr_t);
10573	limit += space;
10574
10575	flags = 0;
10576
10577	if ((asoc->sctp_cmt_on_off > 0) &&
10578	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10579		/*-
10580		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10581		 * received, then set high bit to 1, else 0. Reset
10582		 * pkts_rcvd.
10583		 */
10584		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10585		asoc->cmt_dac_pkts_rcvd = 0;
10586	}
10587#ifdef SCTP_ASOCLOG_OF_TSNS
10588	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10589	stcb->asoc.cumack_log_atsnt++;
10590	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10591		stcb->asoc.cumack_log_atsnt = 0;
10592	}
10593#endif
10594	/* reset the readers interpretation */
10595	stcb->freed_by_sorcv_sincelast = 0;
10596
10597	if (type == SCTP_SELECTIVE_ACK) {
10598		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10599		nr_sack = NULL;
10600		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10601		if (highest_tsn > asoc->mapping_array_base_tsn) {
10602			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10603		} else {
10604			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10605		}
10606	} else {
10607		sack = NULL;
10608		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10609		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10610		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10611			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10612		} else {
10613			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10614		}
10615	}
10616
10617	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10618		offset = 1;
10619	} else {
10620		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10621	}
10622	if (((type == SCTP_SELECTIVE_ACK) &&
10623	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10624	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10625	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10626		/* we have a gap .. maybe */
10627		for (i = 0; i < siz; i++) {
10628			tsn_map = asoc->mapping_array[i];
10629			if (type == SCTP_SELECTIVE_ACK) {
10630				tsn_map |= asoc->nr_mapping_array[i];
10631			}
10632			if (i == 0) {
10633				/*
10634				 * Clear all bits corresponding to TSNs
10635				 * smaller or equal to the cumulative TSN.
10636				 */
10637				tsn_map &= (~0 << (1 - offset));
10638			}
10639			selector = &sack_array[tsn_map];
10640			if (mergeable && selector->right_edge) {
10641				/*
10642				 * Backup, left and right edges were ok to
10643				 * merge.
10644				 */
10645				num_gap_blocks--;
10646				gap_descriptor--;
10647			}
10648			if (selector->num_entries == 0)
10649				mergeable = 0;
10650			else {
10651				for (j = 0; j < selector->num_entries; j++) {
10652					if (mergeable && selector->right_edge) {
10653						/*
10654						 * do a merge by NOT setting
10655						 * the left side
10656						 */
10657						mergeable = 0;
10658					} else {
10659						/*
10660						 * no merge, set the left
10661						 * side
10662						 */
10663						mergeable = 0;
10664						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10665					}
10666					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10667					num_gap_blocks++;
10668					gap_descriptor++;
10669					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10670						/* no more room */
10671						limit_reached = 1;
10672						break;
10673					}
10674				}
10675				if (selector->left_edge) {
10676					mergeable = 1;
10677				}
10678			}
10679			if (limit_reached) {
10680				/* Reached the limit stop */
10681				break;
10682			}
10683			offset += 8;
10684		}
10685	}
10686	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10687	    (limit_reached == 0)) {
10688
10689		mergeable = 0;
10690
10691		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10692			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10693		} else {
10694			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10695		}
10696
10697		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10698			offset = 1;
10699		} else {
10700			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10701		}
10702		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10703			/* we have a gap .. maybe */
10704			for (i = 0; i < siz; i++) {
10705				tsn_map = asoc->nr_mapping_array[i];
10706				if (i == 0) {
10707					/*
10708					 * Clear all bits corresponding to
10709					 * TSNs smaller or equal to the
10710					 * cumulative TSN.
10711					 */
10712					tsn_map &= (~0 << (1 - offset));
10713				}
10714				selector = &sack_array[tsn_map];
10715				if (mergeable && selector->right_edge) {
10716					/*
10717					 * Backup, left and right edges were
10718					 * ok to merge.
10719					 */
10720					num_nr_gap_blocks--;
10721					gap_descriptor--;
10722				}
10723				if (selector->num_entries == 0)
10724					mergeable = 0;
10725				else {
10726					for (j = 0; j < selector->num_entries; j++) {
10727						if (mergeable && selector->right_edge) {
10728							/*
10729							 * do a merge by NOT
10730							 * setting the left
10731							 * side
10732							 */
10733							mergeable = 0;
10734						} else {
10735							/*
10736							 * no merge, set the
10737							 * left side
10738							 */
10739							mergeable = 0;
10740							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10741						}
10742						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10743						num_nr_gap_blocks++;
10744						gap_descriptor++;
10745						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10746							/* no more room */
10747							limit_reached = 1;
10748							break;
10749						}
10750					}
10751					if (selector->left_edge) {
10752						mergeable = 1;
10753					}
10754				}
10755				if (limit_reached) {
10756					/* Reached the limit stop */
10757					break;
10758				}
10759				offset += 8;
10760			}
10761		}
10762	}
10763	/* now we must add any dups we are going to report. */
10764	if ((limit_reached == 0) && (asoc->numduptsns)) {
10765		dup = (uint32_t *) gap_descriptor;
10766		for (i = 0; i < asoc->numduptsns; i++) {
10767			*dup = htonl(asoc->dup_tsns[i]);
10768			dup++;
10769			num_dups++;
10770			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10771				/* no more room */
10772				break;
10773			}
10774		}
10775		asoc->numduptsns = 0;
10776	}
10777	/*
10778	 * now that the chunk is prepared queue it to the control chunk
10779	 * queue.
10780	 */
10781	if (type == SCTP_SELECTIVE_ACK) {
10782		a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10783		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10784		    num_dups * sizeof(int32_t);
10785		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10786		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10787		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10788		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10789		sack->sack.num_dup_tsns = htons(num_dups);
10790		sack->ch.chunk_type = type;
10791		sack->ch.chunk_flags = flags;
10792		sack->ch.chunk_length = htons(a_chk->send_size);
10793	} else {
10794		a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10795		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10796		    num_dups * sizeof(int32_t);
10797		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10798		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10799		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10800		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10801		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10802		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10803		nr_sack->nr_sack.reserved = 0;
10804		nr_sack->ch.chunk_type = type;
10805		nr_sack->ch.chunk_flags = flags;
10806		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10807	}
10808	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10809	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10810	asoc->ctrl_queue_cnt++;
10811	asoc->send_sack = 0;
10812	SCTP_STAT_INCR(sctps_sendsacks);
10813	return;
10814}
10815
10816void
10817sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10818#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10819    SCTP_UNUSED
10820#endif
10821)
10822{
10823	struct mbuf *m_abort, *m, *m_last;
10824	struct mbuf *m_out, *m_end = NULL;
10825	struct sctp_abort_chunk *abort;
10826	struct sctp_auth_chunk *auth = NULL;
10827	struct sctp_nets *net;
10828	uint32_t vtag;
10829	uint32_t auth_offset = 0;
10830	uint16_t cause_len, chunk_len, padding_len;
10831
10832	SCTP_TCB_LOCK_ASSERT(stcb);
10833	/*-
10834	 * Add an AUTH chunk, if chunk requires it and save the offset into
10835	 * the chain for AUTH
10836	 */
10837	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10838	    stcb->asoc.peer_auth_chunks)) {
10839		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10840		    stcb, SCTP_ABORT_ASSOCIATION);
10841		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10842	} else {
10843		m_out = NULL;
10844	}
10845	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10846	if (m_abort == NULL) {
10847		if (m_out) {
10848			sctp_m_freem(m_out);
10849		}
10850		if (operr) {
10851			sctp_m_freem(operr);
10852		}
10853		return;
10854	}
10855	/* link in any error */
10856	SCTP_BUF_NEXT(m_abort) = operr;
10857	cause_len = 0;
10858	m_last = NULL;
10859	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10860		cause_len += (uint16_t) SCTP_BUF_LEN(m);
10861		if (SCTP_BUF_NEXT(m) == NULL) {
10862			m_last = m;
10863		}
10864	}
10865	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10866	chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10867	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10868	if (m_out == NULL) {
10869		/* NO Auth chunk prepended, so reserve space in front */
10870		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10871		m_out = m_abort;
10872	} else {
10873		/* Put AUTH chunk at the front of the chain */
10874		SCTP_BUF_NEXT(m_end) = m_abort;
10875	}
10876	if (stcb->asoc.alternate) {
10877		net = stcb->asoc.alternate;
10878	} else {
10879		net = stcb->asoc.primary_destination;
10880	}
10881	/* Fill in the ABORT chunk header. */
10882	abort = mtod(m_abort, struct sctp_abort_chunk *);
10883	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10884	if (stcb->asoc.peer_vtag == 0) {
10885		/* This happens iff the assoc is in COOKIE-WAIT state. */
10886		vtag = stcb->asoc.my_vtag;
10887		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10888	} else {
10889		vtag = stcb->asoc.peer_vtag;
10890		abort->ch.chunk_flags = 0;
10891	}
10892	abort->ch.chunk_length = htons(chunk_len);
10893	/* Add padding, if necessary. */
10894	if (padding_len > 0) {
10895		if ((m_last == NULL) ||
10896		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10897			sctp_m_freem(m_out);
10898			return;
10899		}
10900	}
10901	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10902	    (struct sockaddr *)&net->ro._l_addr,
10903	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10904	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10905	    stcb->asoc.primary_destination->port, NULL,
10906	    0, 0,
10907	    so_locked);
10908	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10909}
10910
10911void
10912sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10913    struct sctp_nets *net,
10914    int reflect_vtag)
10915{
10916	/* formulate and SEND a SHUTDOWN-COMPLETE */
10917	struct mbuf *m_shutdown_comp;
10918	struct sctp_shutdown_complete_chunk *shutdown_complete;
10919	uint32_t vtag;
10920	uint8_t flags;
10921
10922	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10923	if (m_shutdown_comp == NULL) {
10924		/* no mbuf's */
10925		return;
10926	}
10927	if (reflect_vtag) {
10928		flags = SCTP_HAD_NO_TCB;
10929		vtag = stcb->asoc.my_vtag;
10930	} else {
10931		flags = 0;
10932		vtag = stcb->asoc.peer_vtag;
10933	}
10934	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10935	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10936	shutdown_complete->ch.chunk_flags = flags;
10937	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10938	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10939	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10940	    (struct sockaddr *)&net->ro._l_addr,
10941	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10942	    stcb->sctp_ep->sctp_lport, stcb->rport,
10943	    htonl(vtag),
10944	    net->port, NULL,
10945	    0, 0,
10946	    SCTP_SO_NOT_LOCKED);
10947	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10948	return;
10949}
10950
10951static void
10952sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10953    struct sctphdr *sh, uint32_t vtag,
10954    uint8_t type, struct mbuf *cause,
10955    uint8_t use_mflowid, uint32_t mflowid,
10956    uint32_t vrf_id, uint16_t port)
10957{
10958	struct mbuf *o_pak;
10959	struct mbuf *mout;
10960	struct sctphdr *shout;
10961	struct sctp_chunkhdr *ch;
10962
10963#if defined(INET) || defined(INET6)
10964	struct udphdr *udp;
10965	int ret;
10966
10967#endif
10968	int len, cause_len, padding_len;
10969
10970#ifdef INET
10971	struct sockaddr_in *src_sin, *dst_sin;
10972	struct ip *ip;
10973
10974#endif
10975#ifdef INET6
10976	struct sockaddr_in6 *src_sin6, *dst_sin6;
10977	struct ip6_hdr *ip6;
10978
10979#endif
10980
10981	/* Compute the length of the cause and add final padding. */
10982	cause_len = 0;
10983	if (cause != NULL) {
10984		struct mbuf *m_at, *m_last = NULL;
10985
10986		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10987			if (SCTP_BUF_NEXT(m_at) == NULL)
10988				m_last = m_at;
10989			cause_len += SCTP_BUF_LEN(m_at);
10990		}
10991		padding_len = cause_len % 4;
10992		if (padding_len != 0) {
10993			padding_len = 4 - padding_len;
10994		}
10995		if (padding_len != 0) {
10996			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10997				sctp_m_freem(cause);
10998				return;
10999			}
11000		}
11001	} else {
11002		padding_len = 0;
11003	}
11004	/* Get an mbuf for the header. */
11005	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11006	switch (dst->sa_family) {
11007#ifdef INET
11008	case AF_INET:
11009		len += sizeof(struct ip);
11010		break;
11011#endif
11012#ifdef INET6
11013	case AF_INET6:
11014		len += sizeof(struct ip6_hdr);
11015		break;
11016#endif
11017	default:
11018		break;
11019	}
11020#if defined(INET) || defined(INET6)
11021	if (port) {
11022		len += sizeof(struct udphdr);
11023	}
11024#endif
11025	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11026	if (mout == NULL) {
11027		if (cause) {
11028			sctp_m_freem(cause);
11029		}
11030		return;
11031	}
11032	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11033	SCTP_BUF_LEN(mout) = len;
11034	SCTP_BUF_NEXT(mout) = cause;
11035	if (use_mflowid != 0) {
11036		mout->m_pkthdr.flowid = mflowid;
11037		mout->m_flags |= M_FLOWID;
11038	}
11039#ifdef INET
11040	ip = NULL;
11041#endif
11042#ifdef INET6
11043	ip6 = NULL;
11044#endif
11045	switch (dst->sa_family) {
11046#ifdef INET
11047	case AF_INET:
11048		src_sin = (struct sockaddr_in *)src;
11049		dst_sin = (struct sockaddr_in *)dst;
11050		ip = mtod(mout, struct ip *);
11051		ip->ip_v = IPVERSION;
11052		ip->ip_hl = (sizeof(struct ip) >> 2);
11053		ip->ip_tos = 0;
11054		ip->ip_id = ip_newid();
11055		ip->ip_off = 0;
11056		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11057		if (port) {
11058			ip->ip_p = IPPROTO_UDP;
11059		} else {
11060			ip->ip_p = IPPROTO_SCTP;
11061		}
11062		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11063		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11064		ip->ip_sum = 0;
11065		len = sizeof(struct ip);
11066		shout = (struct sctphdr *)((caddr_t)ip + len);
11067		break;
11068#endif
11069#ifdef INET6
11070	case AF_INET6:
11071		src_sin6 = (struct sockaddr_in6 *)src;
11072		dst_sin6 = (struct sockaddr_in6 *)dst;
11073		ip6 = mtod(mout, struct ip6_hdr *);
11074		ip6->ip6_flow = htonl(0x60000000);
11075		if (V_ip6_auto_flowlabel) {
11076			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11077		}
11078		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11079		if (port) {
11080			ip6->ip6_nxt = IPPROTO_UDP;
11081		} else {
11082			ip6->ip6_nxt = IPPROTO_SCTP;
11083		}
11084		ip6->ip6_src = dst_sin6->sin6_addr;
11085		ip6->ip6_dst = src_sin6->sin6_addr;
11086		len = sizeof(struct ip6_hdr);
11087		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11088		break;
11089#endif
11090	default:
11091		len = 0;
11092		shout = mtod(mout, struct sctphdr *);
11093		break;
11094	}
11095#if defined(INET) || defined(INET6)
11096	if (port) {
11097		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11098			sctp_m_freem(mout);
11099			return;
11100		}
11101		udp = (struct udphdr *)shout;
11102		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11103		udp->uh_dport = port;
11104		udp->uh_sum = 0;
11105		udp->uh_ulen = htons(sizeof(struct udphdr) +
11106		    sizeof(struct sctphdr) +
11107		    sizeof(struct sctp_chunkhdr) +
11108		    cause_len + padding_len);
11109		len += sizeof(struct udphdr);
11110		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11111	} else {
11112		udp = NULL;
11113	}
11114#endif
11115	shout->src_port = sh->dest_port;
11116	shout->dest_port = sh->src_port;
11117	shout->checksum = 0;
11118	if (vtag) {
11119		shout->v_tag = htonl(vtag);
11120	} else {
11121		shout->v_tag = sh->v_tag;
11122	}
11123	len += sizeof(struct sctphdr);
11124	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11125	ch->chunk_type = type;
11126	if (vtag) {
11127		ch->chunk_flags = 0;
11128	} else {
11129		ch->chunk_flags = SCTP_HAD_NO_TCB;
11130	}
11131	ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11132	len += sizeof(struct sctp_chunkhdr);
11133	len += cause_len + padding_len;
11134
11135	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11136		sctp_m_freem(mout);
11137		return;
11138	}
11139	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11140	switch (dst->sa_family) {
11141#ifdef INET
11142	case AF_INET:
11143		if (port) {
11144			if (V_udp_cksum) {
11145				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11146			} else {
11147				udp->uh_sum = 0;
11148			}
11149		}
11150		ip->ip_len = htons(len);
11151		if (port) {
11152#if defined(SCTP_WITH_NO_CSUM)
11153			SCTP_STAT_INCR(sctps_sendnocrc);
11154#else
11155			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11156			SCTP_STAT_INCR(sctps_sendswcrc);
11157#endif
11158			if (V_udp_cksum) {
11159				SCTP_ENABLE_UDP_CSUM(o_pak);
11160			}
11161		} else {
11162#if defined(SCTP_WITH_NO_CSUM)
11163			SCTP_STAT_INCR(sctps_sendnocrc);
11164#else
11165			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11166			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11167			SCTP_STAT_INCR(sctps_sendhwcrc);
11168#endif
11169		}
11170#ifdef SCTP_PACKET_LOGGING
11171		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11172			sctp_packet_log(o_pak);
11173		}
11174#endif
11175		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11176		break;
11177#endif
11178#ifdef INET6
11179	case AF_INET6:
11180		ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11181		if (port) {
11182#if defined(SCTP_WITH_NO_CSUM)
11183			SCTP_STAT_INCR(sctps_sendnocrc);
11184#else
11185			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11186			SCTP_STAT_INCR(sctps_sendswcrc);
11187#endif
11188			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11189				udp->uh_sum = 0xffff;
11190			}
11191		} else {
11192#if defined(SCTP_WITH_NO_CSUM)
11193			SCTP_STAT_INCR(sctps_sendnocrc);
11194#else
11195			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11196			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11197			SCTP_STAT_INCR(sctps_sendhwcrc);
11198#endif
11199		}
11200#ifdef SCTP_PACKET_LOGGING
11201		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11202			sctp_packet_log(o_pak);
11203		}
11204#endif
11205		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11206		break;
11207#endif
11208	default:
11209		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11210		    dst->sa_family);
11211		sctp_m_freem(mout);
11212		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11213		return;
11214	}
11215	SCTP_STAT_INCR(sctps_sendpackets);
11216	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11217	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11218	return;
11219}
11220
11221void
11222sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11223    struct sctphdr *sh,
11224    uint8_t use_mflowid, uint32_t mflowid,
11225    uint32_t vrf_id, uint16_t port)
11226{
11227	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11228	    use_mflowid, mflowid,
11229	    vrf_id, port);
11230}
11231
11232void
11233sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11234#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11235    SCTP_UNUSED
11236#endif
11237)
11238{
11239	struct sctp_tmit_chunk *chk;
11240	struct sctp_heartbeat_chunk *hb;
11241	struct timeval now;
11242
11243	SCTP_TCB_LOCK_ASSERT(stcb);
11244	if (net == NULL) {
11245		return;
11246	}
11247	(void)SCTP_GETTIME_TIMEVAL(&now);
11248	switch (net->ro._l_addr.sa.sa_family) {
11249#ifdef INET
11250	case AF_INET:
11251		break;
11252#endif
11253#ifdef INET6
11254	case AF_INET6:
11255		break;
11256#endif
11257	default:
11258		return;
11259	}
11260	sctp_alloc_a_chunk(stcb, chk);
11261	if (chk == NULL) {
11262		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11263		return;
11264	}
11265	chk->copy_by_ref = 0;
11266	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11267	chk->rec.chunk_id.can_take_data = 1;
11268	chk->flags = 0;
11269	chk->asoc = &stcb->asoc;
11270	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11271
11272	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11273	if (chk->data == NULL) {
11274		sctp_free_a_chunk(stcb, chk, so_locked);
11275		return;
11276	}
11277	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11278	SCTP_BUF_LEN(chk->data) = chk->send_size;
11279	chk->sent = SCTP_DATAGRAM_UNSENT;
11280	chk->snd_count = 0;
11281	chk->whoTo = net;
11282	atomic_add_int(&chk->whoTo->ref_count, 1);
11283	/* Now we have a mbuf that we can fill in with the details */
11284	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11285	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11286	/* fill out chunk header */
11287	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11288	hb->ch.chunk_flags = 0;
11289	hb->ch.chunk_length = htons(chk->send_size);
11290	/* Fill out hb parameter */
11291	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11292	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11293	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11294	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11295	/* Did our user request this one, put it in */
11296	hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11297	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11298	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11299		/*
11300		 * we only take from the entropy pool if the address is not
11301		 * confirmed.
11302		 */
11303		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11304		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11305	} else {
11306		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11307		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11308	}
11309	switch (net->ro._l_addr.sa.sa_family) {
11310#ifdef INET
11311	case AF_INET:
11312		memcpy(hb->heartbeat.hb_info.address,
11313		    &net->ro._l_addr.sin.sin_addr,
11314		    sizeof(net->ro._l_addr.sin.sin_addr));
11315		break;
11316#endif
11317#ifdef INET6
11318	case AF_INET6:
11319		memcpy(hb->heartbeat.hb_info.address,
11320		    &net->ro._l_addr.sin6.sin6_addr,
11321		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11322		break;
11323#endif
11324	default:
11325		return;
11326		break;
11327	}
11328	net->hb_responded = 0;
11329	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11330	stcb->asoc.ctrl_queue_cnt++;
11331	SCTP_STAT_INCR(sctps_sendheartbeat);
11332	return;
11333}
11334
11335void
11336sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11337    uint32_t high_tsn)
11338{
11339	struct sctp_association *asoc;
11340	struct sctp_ecne_chunk *ecne;
11341	struct sctp_tmit_chunk *chk;
11342
11343	if (net == NULL) {
11344		return;
11345	}
11346	asoc = &stcb->asoc;
11347	SCTP_TCB_LOCK_ASSERT(stcb);
11348	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11349		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11350			/* found a previous ECN_ECHO update it if needed */
11351			uint32_t cnt, ctsn;
11352
11353			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11354			ctsn = ntohl(ecne->tsn);
11355			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11356				ecne->tsn = htonl(high_tsn);
11357				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11358			}
11359			cnt = ntohl(ecne->num_pkts_since_cwr);
11360			cnt++;
11361			ecne->num_pkts_since_cwr = htonl(cnt);
11362			return;
11363		}
11364	}
11365	/* nope could not find one to update so we must build one */
11366	sctp_alloc_a_chunk(stcb, chk);
11367	if (chk == NULL) {
11368		return;
11369	}
11370	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11371	chk->copy_by_ref = 0;
11372	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11373	chk->rec.chunk_id.can_take_data = 0;
11374	chk->flags = 0;
11375	chk->asoc = &stcb->asoc;
11376	chk->send_size = sizeof(struct sctp_ecne_chunk);
11377	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11378	if (chk->data == NULL) {
11379		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11380		return;
11381	}
11382	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11383	SCTP_BUF_LEN(chk->data) = chk->send_size;
11384	chk->sent = SCTP_DATAGRAM_UNSENT;
11385	chk->snd_count = 0;
11386	chk->whoTo = net;
11387	atomic_add_int(&chk->whoTo->ref_count, 1);
11388
11389	stcb->asoc.ecn_echo_cnt_onq++;
11390	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11391	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11392	ecne->ch.chunk_flags = 0;
11393	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11394	ecne->tsn = htonl(high_tsn);
11395	ecne->num_pkts_since_cwr = htonl(1);
11396	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11397	asoc->ctrl_queue_cnt++;
11398}
11399
11400void
11401sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11402    struct mbuf *m, int len, int iphlen, int bad_crc)
11403{
11404	struct sctp_association *asoc;
11405	struct sctp_pktdrop_chunk *drp;
11406	struct sctp_tmit_chunk *chk;
11407	uint8_t *datap;
11408	int was_trunc = 0;
11409	int fullsz = 0;
11410	long spc;
11411	int offset;
11412	struct sctp_chunkhdr *ch, chunk_buf;
11413	unsigned int chk_length;
11414
11415	if (!stcb) {
11416		return;
11417	}
11418	asoc = &stcb->asoc;
11419	SCTP_TCB_LOCK_ASSERT(stcb);
11420	if (asoc->pktdrop_supported == 0) {
11421		/*-
11422		 * peer must declare support before I send one.
11423		 */
11424		return;
11425	}
11426	if (stcb->sctp_socket == NULL) {
11427		return;
11428	}
11429	sctp_alloc_a_chunk(stcb, chk);
11430	if (chk == NULL) {
11431		return;
11432	}
11433	chk->copy_by_ref = 0;
11434	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11435	chk->rec.chunk_id.can_take_data = 1;
11436	chk->flags = 0;
11437	len -= iphlen;
11438	chk->send_size = len;
11439	/* Validate that we do not have an ABORT in here. */
11440	offset = iphlen + sizeof(struct sctphdr);
11441	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11442	    sizeof(*ch), (uint8_t *) & chunk_buf);
11443	while (ch != NULL) {
11444		chk_length = ntohs(ch->chunk_length);
11445		if (chk_length < sizeof(*ch)) {
11446			/* break to abort land */
11447			break;
11448		}
11449		switch (ch->chunk_type) {
11450		case SCTP_PACKET_DROPPED:
11451		case SCTP_ABORT_ASSOCIATION:
11452		case SCTP_INITIATION_ACK:
11453			/**
11454			 * We don't respond with an PKT-DROP to an ABORT
11455			 * or PKT-DROP. We also do not respond to an
11456			 * INIT-ACK, because we can't know if the initiation
11457			 * tag is correct or not.
11458			 */
11459			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11460			return;
11461		default:
11462			break;
11463		}
11464		offset += SCTP_SIZE32(chk_length);
11465		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11466		    sizeof(*ch), (uint8_t *) & chunk_buf);
11467	}
11468
11469	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11470	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11471		/*
11472		 * only send 1 mtu worth, trim off the excess on the end.
11473		 */
11474		fullsz = len;
11475		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11476		was_trunc = 1;
11477	}
11478	chk->asoc = &stcb->asoc;
11479	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11480	if (chk->data == NULL) {
11481jump_out:
11482		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11483		return;
11484	}
11485	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11486	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11487	if (drp == NULL) {
11488		sctp_m_freem(chk->data);
11489		chk->data = NULL;
11490		goto jump_out;
11491	}
11492	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11493	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11494	chk->book_size_scale = 0;
11495	if (was_trunc) {
11496		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11497		drp->trunc_len = htons(fullsz);
11498		/*
11499		 * Len is already adjusted to size minus overhead above take
11500		 * out the pkt_drop chunk itself from it.
11501		 */
11502		chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11503		len = chk->send_size;
11504	} else {
11505		/* no truncation needed */
11506		drp->ch.chunk_flags = 0;
11507		drp->trunc_len = htons(0);
11508	}
11509	if (bad_crc) {
11510		drp->ch.chunk_flags |= SCTP_BADCRC;
11511	}
11512	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11513	SCTP_BUF_LEN(chk->data) = chk->send_size;
11514	chk->sent = SCTP_DATAGRAM_UNSENT;
11515	chk->snd_count = 0;
11516	if (net) {
11517		/* we should hit here */
11518		chk->whoTo = net;
11519		atomic_add_int(&chk->whoTo->ref_count, 1);
11520	} else {
11521		chk->whoTo = NULL;
11522	}
11523	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11524	drp->ch.chunk_length = htons(chk->send_size);
11525	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11526	if (spc < 0) {
11527		spc = 0;
11528	}
11529	drp->bottle_bw = htonl(spc);
11530	if (asoc->my_rwnd) {
11531		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11532		    asoc->size_on_all_streams +
11533		    asoc->my_rwnd_control_len +
11534		    stcb->sctp_socket->so_rcv.sb_cc);
11535	} else {
11536		/*-
11537		 * If my rwnd is 0, possibly from mbuf depletion as well as
11538		 * space used, tell the peer there is NO space aka onq == bw
11539		 */
11540		drp->current_onq = htonl(spc);
11541	}
11542	drp->reserved = 0;
11543	datap = drp->data;
11544	m_copydata(m, iphlen, len, (caddr_t)datap);
11545	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11546	asoc->ctrl_queue_cnt++;
11547}
11548
11549void
11550sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11551{
11552	struct sctp_association *asoc;
11553	struct sctp_cwr_chunk *cwr;
11554	struct sctp_tmit_chunk *chk;
11555
11556	SCTP_TCB_LOCK_ASSERT(stcb);
11557	if (net == NULL) {
11558		return;
11559	}
11560	asoc = &stcb->asoc;
11561	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11562		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11563			/*
11564			 * found a previous CWR queued to same destination
11565			 * update it if needed
11566			 */
11567			uint32_t ctsn;
11568
11569			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11570			ctsn = ntohl(cwr->tsn);
11571			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11572				cwr->tsn = htonl(high_tsn);
11573			}
11574			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11575				/* Make sure override is carried */
11576				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11577			}
11578			return;
11579		}
11580	}
11581	sctp_alloc_a_chunk(stcb, chk);
11582	if (chk == NULL) {
11583		return;
11584	}
11585	chk->copy_by_ref = 0;
11586	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11587	chk->rec.chunk_id.can_take_data = 1;
11588	chk->flags = 0;
11589	chk->asoc = &stcb->asoc;
11590	chk->send_size = sizeof(struct sctp_cwr_chunk);
11591	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11592	if (chk->data == NULL) {
11593		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11594		return;
11595	}
11596	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11597	SCTP_BUF_LEN(chk->data) = chk->send_size;
11598	chk->sent = SCTP_DATAGRAM_UNSENT;
11599	chk->snd_count = 0;
11600	chk->whoTo = net;
11601	atomic_add_int(&chk->whoTo->ref_count, 1);
11602	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11603	cwr->ch.chunk_type = SCTP_ECN_CWR;
11604	cwr->ch.chunk_flags = override;
11605	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11606	cwr->tsn = htonl(high_tsn);
11607	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11608	asoc->ctrl_queue_cnt++;
11609}
11610
11611void
11612sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11613    int number_entries, uint16_t * list,
11614    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11615{
11616	uint16_t len, old_len, i;
11617	struct sctp_stream_reset_out_request *req_out;
11618	struct sctp_chunkhdr *ch;
11619
11620	ch = mtod(chk->data, struct sctp_chunkhdr *);
11621	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11622
11623	/* get to new offset for the param. */
11624	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11625	/* now how long will this param be? */
11626	len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11627	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11628	req_out->ph.param_length = htons(len);
11629	req_out->request_seq = htonl(seq);
11630	req_out->response_seq = htonl(resp_seq);
11631	req_out->send_reset_at_tsn = htonl(last_sent);
11632	if (number_entries) {
11633		for (i = 0; i < number_entries; i++) {
11634			req_out->list_of_streams[i] = htons(list[i]);
11635		}
11636	}
11637	if (SCTP_SIZE32(len) > len) {
11638		/*-
11639		 * Need to worry about the pad we may end up adding to the
11640		 * end. This is easy since the struct is either aligned to 4
11641		 * bytes or 2 bytes off.
11642		 */
11643		req_out->list_of_streams[number_entries] = 0;
11644	}
11645	/* now fix the chunk length */
11646	ch->chunk_length = htons(len + old_len);
11647	chk->book_size = len + old_len;
11648	chk->book_size_scale = 0;
11649	chk->send_size = SCTP_SIZE32(chk->book_size);
11650	SCTP_BUF_LEN(chk->data) = chk->send_size;
11651	return;
11652}
11653
11654static void
11655sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11656    int number_entries, uint16_t * list,
11657    uint32_t seq)
11658{
11659	uint16_t len, old_len, i;
11660	struct sctp_stream_reset_in_request *req_in;
11661	struct sctp_chunkhdr *ch;
11662
11663	ch = mtod(chk->data, struct sctp_chunkhdr *);
11664	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11665
11666	/* get to new offset for the param. */
11667	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11668	/* now how long will this param be? */
11669	len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11670	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11671	req_in->ph.param_length = htons(len);
11672	req_in->request_seq = htonl(seq);
11673	if (number_entries) {
11674		for (i = 0; i < number_entries; i++) {
11675			req_in->list_of_streams[i] = htons(list[i]);
11676		}
11677	}
11678	if (SCTP_SIZE32(len) > len) {
11679		/*-
11680		 * Need to worry about the pad we may end up adding to the
11681		 * end. This is easy since the struct is either aligned to 4
11682		 * bytes or 2 bytes off.
11683		 */
11684		req_in->list_of_streams[number_entries] = 0;
11685	}
11686	/* now fix the chunk length */
11687	ch->chunk_length = htons(len + old_len);
11688	chk->book_size = len + old_len;
11689	chk->book_size_scale = 0;
11690	chk->send_size = SCTP_SIZE32(chk->book_size);
11691	SCTP_BUF_LEN(chk->data) = chk->send_size;
11692	return;
11693}
11694
11695static void
11696sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11697    uint32_t seq)
11698{
11699	uint16_t len, old_len;
11700	struct sctp_stream_reset_tsn_request *req_tsn;
11701	struct sctp_chunkhdr *ch;
11702
11703	ch = mtod(chk->data, struct sctp_chunkhdr *);
11704	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11705
11706	/* get to new offset for the param. */
11707	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11708	/* now how long will this param be? */
11709	len = sizeof(struct sctp_stream_reset_tsn_request);
11710	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11711	req_tsn->ph.param_length = htons(len);
11712	req_tsn->request_seq = htonl(seq);
11713
11714	/* now fix the chunk length */
11715	ch->chunk_length = htons(len + old_len);
11716	chk->send_size = len + old_len;
11717	chk->book_size = SCTP_SIZE32(chk->send_size);
11718	chk->book_size_scale = 0;
11719	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11720	return;
11721}
11722
11723void
11724sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11725    uint32_t resp_seq, uint32_t result)
11726{
11727	uint16_t len, old_len;
11728	struct sctp_stream_reset_response *resp;
11729	struct sctp_chunkhdr *ch;
11730
11731	ch = mtod(chk->data, struct sctp_chunkhdr *);
11732	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11733
11734	/* get to new offset for the param. */
11735	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11736	/* now how long will this param be? */
11737	len = sizeof(struct sctp_stream_reset_response);
11738	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11739	resp->ph.param_length = htons(len);
11740	resp->response_seq = htonl(resp_seq);
11741	resp->result = ntohl(result);
11742
11743	/* now fix the chunk length */
11744	ch->chunk_length = htons(len + old_len);
11745	chk->book_size = len + old_len;
11746	chk->book_size_scale = 0;
11747	chk->send_size = SCTP_SIZE32(chk->book_size);
11748	SCTP_BUF_LEN(chk->data) = chk->send_size;
11749	return;
11750}
11751
11752void
11753sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11754    uint32_t resp_seq, uint32_t result,
11755    uint32_t send_una, uint32_t recv_next)
11756{
11757	uint16_t len, old_len;
11758	struct sctp_stream_reset_response_tsn *resp;
11759	struct sctp_chunkhdr *ch;
11760
11761	ch = mtod(chk->data, struct sctp_chunkhdr *);
11762	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11763
11764	/* get to new offset for the param. */
11765	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11766	/* now how long will this param be? */
11767	len = sizeof(struct sctp_stream_reset_response_tsn);
11768	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11769	resp->ph.param_length = htons(len);
11770	resp->response_seq = htonl(resp_seq);
11771	resp->result = htonl(result);
11772	resp->senders_next_tsn = htonl(send_una);
11773	resp->receivers_next_tsn = htonl(recv_next);
11774
11775	/* now fix the chunk length */
11776	ch->chunk_length = htons(len + old_len);
11777	chk->book_size = len + old_len;
11778	chk->send_size = SCTP_SIZE32(chk->book_size);
11779	chk->book_size_scale = 0;
11780	SCTP_BUF_LEN(chk->data) = chk->send_size;
11781	return;
11782}
11783
11784static void
11785sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11786    uint32_t seq,
11787    uint16_t adding)
11788{
11789	uint16_t len, old_len;
11790	struct sctp_chunkhdr *ch;
11791	struct sctp_stream_reset_add_strm *addstr;
11792
11793	ch = mtod(chk->data, struct sctp_chunkhdr *);
11794	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11795
11796	/* get to new offset for the param. */
11797	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11798	/* now how long will this param be? */
11799	len = sizeof(struct sctp_stream_reset_add_strm);
11800
11801	/* Fill it out. */
11802	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11803	addstr->ph.param_length = htons(len);
11804	addstr->request_seq = htonl(seq);
11805	addstr->number_of_streams = htons(adding);
11806	addstr->reserved = 0;
11807
11808	/* now fix the chunk length */
11809	ch->chunk_length = htons(len + old_len);
11810	chk->send_size = len + old_len;
11811	chk->book_size = SCTP_SIZE32(chk->send_size);
11812	chk->book_size_scale = 0;
11813	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11814	return;
11815}
11816
11817static void
11818sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11819    uint32_t seq,
11820    uint16_t adding)
11821{
11822	uint16_t len, old_len;
11823	struct sctp_chunkhdr *ch;
11824	struct sctp_stream_reset_add_strm *addstr;
11825
11826	ch = mtod(chk->data, struct sctp_chunkhdr *);
11827	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11828
11829	/* get to new offset for the param. */
11830	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11831	/* now how long will this param be? */
11832	len = sizeof(struct sctp_stream_reset_add_strm);
11833	/* Fill it out. */
11834	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11835	addstr->ph.param_length = htons(len);
11836	addstr->request_seq = htonl(seq);
11837	addstr->number_of_streams = htons(adding);
11838	addstr->reserved = 0;
11839
11840	/* now fix the chunk length */
11841	ch->chunk_length = htons(len + old_len);
11842	chk->send_size = len + old_len;
11843	chk->book_size = SCTP_SIZE32(chk->send_size);
11844	chk->book_size_scale = 0;
11845	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11846	return;
11847}
11848
11849int
11850sctp_send_str_reset_req(struct sctp_tcb *stcb,
11851    uint16_t number_entries, uint16_t * list,
11852    uint8_t send_out_req,
11853    uint8_t send_in_req,
11854    uint8_t send_tsn_req,
11855    uint8_t add_stream,
11856    uint16_t adding_o,
11857    uint16_t adding_i, uint8_t peer_asked)
11858{
11859
11860	struct sctp_association *asoc;
11861	struct sctp_tmit_chunk *chk;
11862	struct sctp_chunkhdr *ch;
11863	uint32_t seq;
11864
11865	asoc = &stcb->asoc;
11866	if (asoc->stream_reset_outstanding) {
11867		/*-
11868		 * Already one pending, must get ACK back to clear the flag.
11869		 */
11870		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11871		return (EBUSY);
11872	}
11873	if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11874	    (add_stream == 0)) {
11875		/* nothing to do */
11876		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11877		return (EINVAL);
11878	}
11879	if (send_tsn_req && (send_out_req || send_in_req)) {
11880		/* error, can't do that */
11881		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11882		return (EINVAL);
11883	}
11884	if (number_entries > (MCLBYTES -
11885	    SCTP_MIN_OVERHEAD -
11886	    sizeof(struct sctp_chunkhdr) -
11887	    sizeof(struct sctp_stream_reset_out_request)) /
11888	    sizeof(uint16_t)) {
11889		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11890		return (ENOMEM);
11891	}
11892	sctp_alloc_a_chunk(stcb, chk);
11893	if (chk == NULL) {
11894		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11895		return (ENOMEM);
11896	}
11897	chk->copy_by_ref = 0;
11898	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11899	chk->rec.chunk_id.can_take_data = 0;
11900	chk->flags = 0;
11901	chk->asoc = &stcb->asoc;
11902	chk->book_size = sizeof(struct sctp_chunkhdr);
11903	chk->send_size = SCTP_SIZE32(chk->book_size);
11904	chk->book_size_scale = 0;
11905
11906	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11907	if (chk->data == NULL) {
11908		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11909		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11910		return (ENOMEM);
11911	}
11912	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11913
11914	/* setup chunk parameters */
11915	chk->sent = SCTP_DATAGRAM_UNSENT;
11916	chk->snd_count = 0;
11917	if (stcb->asoc.alternate) {
11918		chk->whoTo = stcb->asoc.alternate;
11919	} else {
11920		chk->whoTo = stcb->asoc.primary_destination;
11921	}
11922	atomic_add_int(&chk->whoTo->ref_count, 1);
11923	ch = mtod(chk->data, struct sctp_chunkhdr *);
11924	ch->chunk_type = SCTP_STREAM_RESET;
11925	ch->chunk_flags = 0;
11926	ch->chunk_length = htons(chk->book_size);
11927	SCTP_BUF_LEN(chk->data) = chk->send_size;
11928
11929	seq = stcb->asoc.str_reset_seq_out;
11930	if (send_out_req) {
11931		sctp_add_stream_reset_out(chk, number_entries, list,
11932		    seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11933		asoc->stream_reset_out_is_outstanding = 1;
11934		seq++;
11935		asoc->stream_reset_outstanding++;
11936	}
11937	if ((add_stream & 1) &&
11938	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11939		/* Need to allocate more */
11940		struct sctp_stream_out *oldstream;
11941		struct sctp_stream_queue_pending *sp, *nsp;
11942		int i;
11943
11944#if defined(SCTP_DETAILED_STR_STATS)
11945		int j;
11946
11947#endif
11948
11949		oldstream = stcb->asoc.strmout;
11950		/* get some more */
11951		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11952		    ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11953		    SCTP_M_STRMO);
11954		if (stcb->asoc.strmout == NULL) {
11955			uint8_t x;
11956
11957			stcb->asoc.strmout = oldstream;
11958			/* Turn off the bit */
11959			x = add_stream & 0xfe;
11960			add_stream = x;
11961			goto skip_stuff;
11962		}
11963		/*
11964		 * Ok now we proceed with copying the old out stuff and
11965		 * initializing the new stuff.
11966		 */
11967		SCTP_TCB_SEND_LOCK(stcb);
11968		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11969		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11970			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11971			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11972			stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11973			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11974			stcb->asoc.strmout[i].stream_no = i;
11975			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11976			/* now anything on those queues? */
11977			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11978				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11979				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11980			}
11981			/* Now move assoc pointers too */
11982			if (stcb->asoc.last_out_stream == &oldstream[i]) {
11983				stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11984			}
11985			if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11986				stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11987			}
11988		}
11989		/* now the new streams */
11990		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11991		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11992			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11993			stcb->asoc.strmout[i].chunks_on_queues = 0;
11994#if defined(SCTP_DETAILED_STR_STATS)
11995			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
11996				stcb->asoc.strmout[i].abandoned_sent[j] = 0;
11997				stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
11998			}
11999#else
12000			stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12001			stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12002#endif
12003			stcb->asoc.strmout[i].next_sequence_send = 0x0;
12004			stcb->asoc.strmout[i].stream_no = i;
12005			stcb->asoc.strmout[i].last_msg_incomplete = 0;
12006			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12007		}
12008		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12009		SCTP_FREE(oldstream, SCTP_M_STRMO);
12010		SCTP_TCB_SEND_UNLOCK(stcb);
12011	}
12012skip_stuff:
12013	if ((add_stream & 1) && (adding_o > 0)) {
12014		asoc->strm_pending_add_size = adding_o;
12015		asoc->peer_req_out = peer_asked;
12016		sctp_add_an_out_stream(chk, seq, adding_o);
12017		seq++;
12018		asoc->stream_reset_outstanding++;
12019	}
12020	if ((add_stream & 2) && (adding_i > 0)) {
12021		sctp_add_an_in_stream(chk, seq, adding_i);
12022		seq++;
12023		asoc->stream_reset_outstanding++;
12024	}
12025	if (send_in_req) {
12026		sctp_add_stream_reset_in(chk, number_entries, list, seq);
12027		seq++;
12028		asoc->stream_reset_outstanding++;
12029	}
12030	if (send_tsn_req) {
12031		sctp_add_stream_reset_tsn(chk, seq);
12032		asoc->stream_reset_outstanding++;
12033	}
12034	asoc->str_reset = chk;
12035	/* insert the chunk for sending */
12036	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12037	    chk,
12038	    sctp_next);
12039	asoc->ctrl_queue_cnt++;
12040	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12041	return (0);
12042}
12043
12044void
12045sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12046    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12047    uint8_t use_mflowid, uint32_t mflowid,
12048    uint32_t vrf_id, uint16_t port)
12049{
12050	/* Don't respond to an ABORT with an ABORT. */
12051	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12052		if (cause)
12053			sctp_m_freem(cause);
12054		return;
12055	}
12056	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12057	    use_mflowid, mflowid,
12058	    vrf_id, port);
12059	return;
12060}
12061
12062void
12063sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12064    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12065    uint8_t use_mflowid, uint32_t mflowid,
12066    uint32_t vrf_id, uint16_t port)
12067{
12068	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12069	    use_mflowid, mflowid,
12070	    vrf_id, port);
12071	return;
12072}
12073
12074static struct mbuf *
12075sctp_copy_resume(struct uio *uio,
12076    int max_send_len,
12077    int user_marks_eor,
12078    int *error,
12079    uint32_t * sndout,
12080    struct mbuf **new_tail)
12081{
12082	struct mbuf *m;
12083
12084	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12085	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12086	if (m == NULL) {
12087		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12088		*error = ENOBUFS;
12089	} else {
12090		*sndout = m_length(m, NULL);
12091		*new_tail = m_last(m);
12092	}
12093	return (m);
12094}
12095
12096static int
12097sctp_copy_one(struct sctp_stream_queue_pending *sp,
12098    struct uio *uio,
12099    int resv_upfront)
12100{
12101	int left;
12102
12103	left = sp->length;
12104	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12105	    resv_upfront, 0);
12106	if (sp->data == NULL) {
12107		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12108		return (ENOBUFS);
12109	}
12110	sp->tail_mbuf = m_last(sp->data);
12111	return (0);
12112}
12113
12114
12115
12116static struct sctp_stream_queue_pending *
12117sctp_copy_it_in(struct sctp_tcb *stcb,
12118    struct sctp_association *asoc,
12119    struct sctp_sndrcvinfo *srcv,
12120    struct uio *uio,
12121    struct sctp_nets *net,
12122    int max_send_len,
12123    int user_marks_eor,
12124    int *error)
12125{
12126	/*-
12127	 * This routine must be very careful in its work. Protocol
12128	 * processing is up and running so care must be taken to spl...()
12129	 * when you need to do something that may effect the stcb/asoc. The
12130	 * sb is locked however. When data is copied the protocol processing
12131	 * should be enabled since this is a slower operation...
12132	 */
12133	struct sctp_stream_queue_pending *sp = NULL;
12134	int resv_in_first;
12135
12136	*error = 0;
12137	/* Now can we send this? */
12138	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12139	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12140	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12141	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12142		/* got data while shutting down */
12143		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12144		*error = ECONNRESET;
12145		goto out_now;
12146	}
12147	sctp_alloc_a_strmoq(stcb, sp);
12148	if (sp == NULL) {
12149		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12150		*error = ENOMEM;
12151		goto out_now;
12152	}
12153	sp->act_flags = 0;
12154	sp->sender_all_done = 0;
12155	sp->sinfo_flags = srcv->sinfo_flags;
12156	sp->timetolive = srcv->sinfo_timetolive;
12157	sp->ppid = srcv->sinfo_ppid;
12158	sp->context = srcv->sinfo_context;
12159	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12160
12161	sp->stream = srcv->sinfo_stream;
12162	sp->length = min(uio->uio_resid, max_send_len);
12163	if ((sp->length == (uint32_t) uio->uio_resid) &&
12164	    ((user_marks_eor == 0) ||
12165	    (srcv->sinfo_flags & SCTP_EOF) ||
12166	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12167		sp->msg_is_complete = 1;
12168	} else {
12169		sp->msg_is_complete = 0;
12170	}
12171	sp->sender_all_done = 0;
12172	sp->some_taken = 0;
12173	sp->put_last_out = 0;
12174	resv_in_first = sizeof(struct sctp_data_chunk);
12175	sp->data = sp->tail_mbuf = NULL;
12176	if (sp->length == 0) {
12177		*error = 0;
12178		goto skip_copy;
12179	}
12180	if (srcv->sinfo_keynumber_valid) {
12181		sp->auth_keyid = srcv->sinfo_keynumber;
12182	} else {
12183		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12184	}
12185	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12186		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12187		sp->holds_key_ref = 1;
12188	}
12189	*error = sctp_copy_one(sp, uio, resv_in_first);
12190skip_copy:
12191	if (*error) {
12192		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12193		sp = NULL;
12194	} else {
12195		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12196			sp->net = net;
12197			atomic_add_int(&sp->net->ref_count, 1);
12198		} else {
12199			sp->net = NULL;
12200		}
12201		sctp_set_prsctp_policy(sp);
12202	}
12203out_now:
12204	return (sp);
12205}
12206
12207
12208int
12209sctp_sosend(struct socket *so,
12210    struct sockaddr *addr,
12211    struct uio *uio,
12212    struct mbuf *top,
12213    struct mbuf *control,
12214    int flags,
12215    struct thread *p
12216)
12217{
12218	int error, use_sndinfo = 0;
12219	struct sctp_sndrcvinfo sndrcvninfo;
12220	struct sockaddr *addr_to_use;
12221
12222#if defined(INET) && defined(INET6)
12223	struct sockaddr_in sin;
12224
12225#endif
12226
12227	if (control) {
12228		/* process cmsg snd/rcv info (maybe a assoc-id) */
12229		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12230		    sizeof(sndrcvninfo))) {
12231			/* got one */
12232			use_sndinfo = 1;
12233		}
12234	}
12235	addr_to_use = addr;
12236#if defined(INET) && defined(INET6)
12237	if ((addr) && (addr->sa_family == AF_INET6)) {
12238		struct sockaddr_in6 *sin6;
12239
12240		sin6 = (struct sockaddr_in6 *)addr;
12241		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12242			in6_sin6_2_sin(&sin, sin6);
12243			addr_to_use = (struct sockaddr *)&sin;
12244		}
12245	}
12246#endif
12247	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12248	    control,
12249	    flags,
12250	    use_sndinfo ? &sndrcvninfo : NULL
12251	    ,p
12252	    );
12253	return (error);
12254}
12255
12256
12257int
12258sctp_lower_sosend(struct socket *so,
12259    struct sockaddr *addr,
12260    struct uio *uio,
12261    struct mbuf *i_pak,
12262    struct mbuf *control,
12263    int flags,
12264    struct sctp_sndrcvinfo *srcv
12265    ,
12266    struct thread *p
12267)
12268{
12269	unsigned int sndlen = 0, max_len;
12270	int error, len;
12271	struct mbuf *top = NULL;
12272	int queue_only = 0, queue_only_for_init = 0;
12273	int free_cnt_applied = 0;
12274	int un_sent;
12275	int now_filled = 0;
12276	unsigned int inqueue_bytes = 0;
12277	struct sctp_block_entry be;
12278	struct sctp_inpcb *inp;
12279	struct sctp_tcb *stcb = NULL;
12280	struct timeval now;
12281	struct sctp_nets *net;
12282	struct sctp_association *asoc;
12283	struct sctp_inpcb *t_inp;
12284	int user_marks_eor;
12285	int create_lock_applied = 0;
12286	int nagle_applies = 0;
12287	int some_on_control = 0;
12288	int got_all_of_the_send = 0;
12289	int hold_tcblock = 0;
12290	int non_blocking = 0;
12291	uint32_t local_add_more, local_soresv = 0;
12292	uint16_t port;
12293	uint16_t sinfo_flags;
12294	sctp_assoc_t sinfo_assoc_id;
12295
12296	error = 0;
12297	net = NULL;
12298	stcb = NULL;
12299	asoc = NULL;
12300
12301	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12302	if (inp == NULL) {
12303		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12304		error = EINVAL;
12305		if (i_pak) {
12306			SCTP_RELEASE_PKT(i_pak);
12307		}
12308		return (error);
12309	}
12310	if ((uio == NULL) && (i_pak == NULL)) {
12311		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12312		return (EINVAL);
12313	}
12314	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12315	atomic_add_int(&inp->total_sends, 1);
12316	if (uio) {
12317		if (uio->uio_resid < 0) {
12318			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12319			return (EINVAL);
12320		}
12321		sndlen = uio->uio_resid;
12322	} else {
12323		top = SCTP_HEADER_TO_CHAIN(i_pak);
12324		sndlen = SCTP_HEADER_LEN(i_pak);
12325	}
12326	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12327	    (void *)addr,
12328	    sndlen);
12329	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12330	    (inp->sctp_socket->so_qlimit)) {
12331		/* The listener can NOT send */
12332		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12333		error = ENOTCONN;
12334		goto out_unlocked;
12335	}
12336	/**
12337	 * Pre-screen address, if one is given the sin-len
12338	 * must be set correctly!
12339	 */
12340	if (addr) {
12341		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12342
12343		switch (raddr->sa.sa_family) {
12344#ifdef INET
12345		case AF_INET:
12346			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12347				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12348				error = EINVAL;
12349				goto out_unlocked;
12350			}
12351			port = raddr->sin.sin_port;
12352			break;
12353#endif
12354#ifdef INET6
12355		case AF_INET6:
12356			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12357				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12358				error = EINVAL;
12359				goto out_unlocked;
12360			}
12361			port = raddr->sin6.sin6_port;
12362			break;
12363#endif
12364		default:
12365			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12366			error = EAFNOSUPPORT;
12367			goto out_unlocked;
12368		}
12369	} else
12370		port = 0;
12371
12372	if (srcv) {
12373		sinfo_flags = srcv->sinfo_flags;
12374		sinfo_assoc_id = srcv->sinfo_assoc_id;
12375		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12376		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12377			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12378			error = EINVAL;
12379			goto out_unlocked;
12380		}
12381		if (srcv->sinfo_flags)
12382			SCTP_STAT_INCR(sctps_sends_with_flags);
12383	} else {
12384		sinfo_flags = inp->def_send.sinfo_flags;
12385		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12386	}
12387	if (sinfo_flags & SCTP_SENDALL) {
12388		/* its a sendall */
12389		error = sctp_sendall(inp, uio, top, srcv);
12390		top = NULL;
12391		goto out_unlocked;
12392	}
12393	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12394		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12395		error = EINVAL;
12396		goto out_unlocked;
12397	}
12398	/* now we must find the assoc */
12399	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12400	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12401		SCTP_INP_RLOCK(inp);
12402		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12403		if (stcb) {
12404			SCTP_TCB_LOCK(stcb);
12405			hold_tcblock = 1;
12406		}
12407		SCTP_INP_RUNLOCK(inp);
12408	} else if (sinfo_assoc_id) {
12409		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12410	} else if (addr) {
12411		/*-
12412		 * Since we did not use findep we must
12413		 * increment it, and if we don't find a tcb
12414		 * decrement it.
12415		 */
12416		SCTP_INP_WLOCK(inp);
12417		SCTP_INP_INCR_REF(inp);
12418		SCTP_INP_WUNLOCK(inp);
12419		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12420		if (stcb == NULL) {
12421			SCTP_INP_WLOCK(inp);
12422			SCTP_INP_DECR_REF(inp);
12423			SCTP_INP_WUNLOCK(inp);
12424		} else {
12425			hold_tcblock = 1;
12426		}
12427	}
12428	if ((stcb == NULL) && (addr)) {
12429		/* Possible implicit send? */
12430		SCTP_ASOC_CREATE_LOCK(inp);
12431		create_lock_applied = 1;
12432		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12433		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12434			/* Should I really unlock ? */
12435			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12436			error = EINVAL;
12437			goto out_unlocked;
12438
12439		}
12440		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12441		    (addr->sa_family == AF_INET6)) {
12442			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12443			error = EINVAL;
12444			goto out_unlocked;
12445		}
12446		SCTP_INP_WLOCK(inp);
12447		SCTP_INP_INCR_REF(inp);
12448		SCTP_INP_WUNLOCK(inp);
12449		/* With the lock applied look again */
12450		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12451		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12452			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12453		}
12454		if (stcb == NULL) {
12455			SCTP_INP_WLOCK(inp);
12456			SCTP_INP_DECR_REF(inp);
12457			SCTP_INP_WUNLOCK(inp);
12458		} else {
12459			hold_tcblock = 1;
12460		}
12461		if (error) {
12462			goto out_unlocked;
12463		}
12464		if (t_inp != inp) {
12465			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12466			error = ENOTCONN;
12467			goto out_unlocked;
12468		}
12469	}
12470	if (stcb == NULL) {
12471		if (addr == NULL) {
12472			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12473			error = ENOENT;
12474			goto out_unlocked;
12475		} else {
12476			/* We must go ahead and start the INIT process */
12477			uint32_t vrf_id;
12478
12479			if ((sinfo_flags & SCTP_ABORT) ||
12480			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12481				/*-
12482				 * User asks to abort a non-existant assoc,
12483				 * or EOF a non-existant assoc with no data
12484				 */
12485				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12486				error = ENOENT;
12487				goto out_unlocked;
12488			}
12489			/* get an asoc/stcb struct */
12490			vrf_id = inp->def_vrf_id;
12491#ifdef INVARIANTS
12492			if (create_lock_applied == 0) {
12493				panic("Error, should hold create lock and I don't?");
12494			}
12495#endif
12496			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12497			    p
12498			    );
12499			if (stcb == NULL) {
12500				/* Error is setup for us in the call */
12501				goto out_unlocked;
12502			}
12503			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12504				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12505				/*
12506				 * Set the connected flag so we can queue
12507				 * data
12508				 */
12509				soisconnecting(so);
12510			}
12511			hold_tcblock = 1;
12512			if (create_lock_applied) {
12513				SCTP_ASOC_CREATE_UNLOCK(inp);
12514				create_lock_applied = 0;
12515			} else {
12516				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12517			}
12518			/*
12519			 * Turn on queue only flag to prevent data from
12520			 * being sent
12521			 */
12522			queue_only = 1;
12523			asoc = &stcb->asoc;
12524			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12525			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12526
12527			/* initialize authentication params for the assoc */
12528			sctp_initialize_auth_params(inp, stcb);
12529
12530			if (control) {
12531				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12532					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12533					hold_tcblock = 0;
12534					stcb = NULL;
12535					goto out_unlocked;
12536				}
12537			}
12538			/* out with the INIT */
12539			queue_only_for_init = 1;
12540			/*-
12541			 * we may want to dig in after this call and adjust the MTU
12542			 * value. It defaulted to 1500 (constant) but the ro
12543			 * structure may now have an update and thus we may need to
12544			 * change it BEFORE we append the message.
12545			 */
12546		}
12547	} else
12548		asoc = &stcb->asoc;
12549	if (srcv == NULL)
12550		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12551	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12552		if (addr)
12553			net = sctp_findnet(stcb, addr);
12554		else
12555			net = NULL;
12556		if ((net == NULL) ||
12557		    ((port != 0) && (port != stcb->rport))) {
12558			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12559			error = EINVAL;
12560			goto out_unlocked;
12561		}
12562	} else {
12563		if (stcb->asoc.alternate) {
12564			net = stcb->asoc.alternate;
12565		} else {
12566			net = stcb->asoc.primary_destination;
12567		}
12568	}
12569	atomic_add_int(&stcb->total_sends, 1);
12570	/* Keep the stcb from being freed under our feet */
12571	atomic_add_int(&asoc->refcnt, 1);
12572	free_cnt_applied = 1;
12573
12574	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12575		if (sndlen > asoc->smallest_mtu) {
12576			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12577			error = EMSGSIZE;
12578			goto out_unlocked;
12579		}
12580	}
12581	if (SCTP_SO_IS_NBIO(so)
12582	    || (flags & MSG_NBIO)
12583	    ) {
12584		non_blocking = 1;
12585	}
12586	/* would we block? */
12587	if (non_blocking) {
12588		if (hold_tcblock == 0) {
12589			SCTP_TCB_LOCK(stcb);
12590			hold_tcblock = 1;
12591		}
12592		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12593		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12594		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12595			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12596			if (sndlen > SCTP_SB_LIMIT_SND(so))
12597				error = EMSGSIZE;
12598			else
12599				error = EWOULDBLOCK;
12600			goto out_unlocked;
12601		}
12602		stcb->asoc.sb_send_resv += sndlen;
12603		SCTP_TCB_UNLOCK(stcb);
12604		hold_tcblock = 0;
12605	} else {
12606		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12607	}
12608	local_soresv = sndlen;
12609	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12610		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12611		error = ECONNRESET;
12612		goto out_unlocked;
12613	}
12614	if (create_lock_applied) {
12615		SCTP_ASOC_CREATE_UNLOCK(inp);
12616		create_lock_applied = 0;
12617	}
12618	if (asoc->stream_reset_outstanding) {
12619		/*
12620		 * Can't queue any data while stream reset is underway.
12621		 */
12622		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12623		error = EAGAIN;
12624		goto out_unlocked;
12625	}
12626	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12627	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12628		queue_only = 1;
12629	}
12630	/* we are now done with all control */
12631	if (control) {
12632		sctp_m_freem(control);
12633		control = NULL;
12634	}
12635	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12636	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12637	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12638	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12639		if (srcv->sinfo_flags & SCTP_ABORT) {
12640			;
12641		} else {
12642			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12643			error = ECONNRESET;
12644			goto out_unlocked;
12645		}
12646	}
12647	/* Ok, we will attempt a msgsnd :> */
12648	if (p) {
12649		p->td_ru.ru_msgsnd++;
12650	}
12651	/* Are we aborting? */
12652	if (srcv->sinfo_flags & SCTP_ABORT) {
12653		struct mbuf *mm;
12654		int tot_demand, tot_out = 0, max_out;
12655
12656		SCTP_STAT_INCR(sctps_sends_with_abort);
12657		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12658		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12659			/* It has to be up before we abort */
12660			/* how big is the user initiated abort? */
12661			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12662			error = EINVAL;
12663			goto out;
12664		}
12665		if (hold_tcblock) {
12666			SCTP_TCB_UNLOCK(stcb);
12667			hold_tcblock = 0;
12668		}
12669		if (top) {
12670			struct mbuf *cntm = NULL;
12671
12672			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12673			if (sndlen != 0) {
12674				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12675					tot_out += SCTP_BUF_LEN(cntm);
12676				}
12677			}
12678		} else {
12679			/* Must fit in a MTU */
12680			tot_out = sndlen;
12681			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12682			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12683				/* To big */
12684				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12685				error = EMSGSIZE;
12686				goto out;
12687			}
12688			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12689		}
12690		if (mm == NULL) {
12691			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12692			error = ENOMEM;
12693			goto out;
12694		}
12695		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12696		max_out -= sizeof(struct sctp_abort_msg);
12697		if (tot_out > max_out) {
12698			tot_out = max_out;
12699		}
12700		if (mm) {
12701			struct sctp_paramhdr *ph;
12702
12703			/* now move forward the data pointer */
12704			ph = mtod(mm, struct sctp_paramhdr *);
12705			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12706			ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12707			ph++;
12708			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12709			if (top == NULL) {
12710				error = uiomove((caddr_t)ph, (int)tot_out, uio);
12711				if (error) {
12712					/*-
12713					 * Here if we can't get his data we
12714					 * still abort we just don't get to
12715					 * send the users note :-0
12716					 */
12717					sctp_m_freem(mm);
12718					mm = NULL;
12719				}
12720			} else {
12721				if (sndlen != 0) {
12722					SCTP_BUF_NEXT(mm) = top;
12723				}
12724			}
12725		}
12726		if (hold_tcblock == 0) {
12727			SCTP_TCB_LOCK(stcb);
12728		}
12729		atomic_add_int(&stcb->asoc.refcnt, -1);
12730		free_cnt_applied = 0;
12731		/* release this lock, otherwise we hang on ourselves */
12732		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12733		/* now relock the stcb so everything is sane */
12734		hold_tcblock = 0;
12735		stcb = NULL;
12736		/*
12737		 * In this case top is already chained to mm avoid double
12738		 * free, since we free it below if top != NULL and driver
12739		 * would free it after sending the packet out
12740		 */
12741		if (sndlen != 0) {
12742			top = NULL;
12743		}
12744		goto out_unlocked;
12745	}
12746	/* Calculate the maximum we can send */
12747	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12748	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12749		if (non_blocking) {
12750			/* we already checked for non-blocking above. */
12751			max_len = sndlen;
12752		} else {
12753			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12754		}
12755	} else {
12756		max_len = 0;
12757	}
12758	if (hold_tcblock) {
12759		SCTP_TCB_UNLOCK(stcb);
12760		hold_tcblock = 0;
12761	}
12762	/* Is the stream no. valid? */
12763	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12764		/* Invalid stream number */
12765		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12766		error = EINVAL;
12767		goto out_unlocked;
12768	}
12769	if (asoc->strmout == NULL) {
12770		/* huh? software error */
12771		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12772		error = EFAULT;
12773		goto out_unlocked;
12774	}
12775	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
12776	if ((user_marks_eor == 0) &&
12777	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12778		/* It will NEVER fit */
12779		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12780		error = EMSGSIZE;
12781		goto out_unlocked;
12782	}
12783	if ((uio == NULL) && user_marks_eor) {
12784		/*-
12785		 * We do not support eeor mode for
12786		 * sending with mbuf chains (like sendfile).
12787		 */
12788		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12789		error = EINVAL;
12790		goto out_unlocked;
12791	}
12792	if (user_marks_eor) {
12793		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12794	} else {
12795		/*-
12796		 * For non-eeor the whole message must fit in
12797		 * the socket send buffer.
12798		 */
12799		local_add_more = sndlen;
12800	}
12801	len = 0;
12802	if (non_blocking) {
12803		goto skip_preblock;
12804	}
12805	if (((max_len <= local_add_more) &&
12806	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12807	    (max_len == 0) ||
12808	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12809		/* No room right now ! */
12810		SOCKBUF_LOCK(&so->so_snd);
12811		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12812		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12813		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12814			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12815			    (unsigned int)SCTP_SB_LIMIT_SND(so),
12816			    inqueue_bytes,
12817			    local_add_more,
12818			    stcb->asoc.stream_queue_cnt,
12819			    stcb->asoc.chunks_on_out_queue,
12820			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12821			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12822				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12823			}
12824			be.error = 0;
12825			stcb->block_entry = &be;
12826			error = sbwait(&so->so_snd);
12827			stcb->block_entry = NULL;
12828			if (error || so->so_error || be.error) {
12829				if (error == 0) {
12830					if (so->so_error)
12831						error = so->so_error;
12832					if (be.error) {
12833						error = be.error;
12834					}
12835				}
12836				SOCKBUF_UNLOCK(&so->so_snd);
12837				goto out_unlocked;
12838			}
12839			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12840				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12841				    asoc, stcb->asoc.total_output_queue_size);
12842			}
12843			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12844				goto out_unlocked;
12845			}
12846			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12847		}
12848		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12849			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12850		} else {
12851			max_len = 0;
12852		}
12853		SOCKBUF_UNLOCK(&so->so_snd);
12854	}
12855skip_preblock:
12856	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12857		goto out_unlocked;
12858	}
12859	/*
12860	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12861	 * case NOTE: uio will be null when top/mbuf is passed
12862	 */
12863	if (sndlen == 0) {
12864		if (srcv->sinfo_flags & SCTP_EOF) {
12865			got_all_of_the_send = 1;
12866			goto dataless_eof;
12867		} else {
12868			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12869			error = EINVAL;
12870			goto out;
12871		}
12872	}
12873	if (top == NULL) {
12874		struct sctp_stream_queue_pending *sp;
12875		struct sctp_stream_out *strm;
12876		uint32_t sndout;
12877
12878		SCTP_TCB_SEND_LOCK(stcb);
12879		if ((asoc->stream_locked) &&
12880		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
12881			SCTP_TCB_SEND_UNLOCK(stcb);
12882			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12883			error = EINVAL;
12884			goto out;
12885		}
12886		SCTP_TCB_SEND_UNLOCK(stcb);
12887
12888		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12889		if (strm->last_msg_incomplete == 0) {
12890	do_a_copy_in:
12891			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12892			if ((sp == NULL) || (error)) {
12893				goto out;
12894			}
12895			SCTP_TCB_SEND_LOCK(stcb);
12896			if (sp->msg_is_complete) {
12897				strm->last_msg_incomplete = 0;
12898				asoc->stream_locked = 0;
12899			} else {
12900				/*
12901				 * Just got locked to this guy in case of an
12902				 * interrupt.
12903				 */
12904				strm->last_msg_incomplete = 1;
12905				asoc->stream_locked = 1;
12906				asoc->stream_locked_on = srcv->sinfo_stream;
12907				sp->sender_all_done = 0;
12908			}
12909			sctp_snd_sb_alloc(stcb, sp->length);
12910			atomic_add_int(&asoc->stream_queue_cnt, 1);
12911			if (srcv->sinfo_flags & SCTP_UNORDERED) {
12912				SCTP_STAT_INCR(sctps_sends_with_unord);
12913			}
12914			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12915			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12916			SCTP_TCB_SEND_UNLOCK(stcb);
12917		} else {
12918			SCTP_TCB_SEND_LOCK(stcb);
12919			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12920			SCTP_TCB_SEND_UNLOCK(stcb);
12921			if (sp == NULL) {
12922				/* ???? Huh ??? last msg is gone */
12923#ifdef INVARIANTS
12924				panic("Warning: Last msg marked incomplete, yet nothing left?");
12925#else
12926				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12927				strm->last_msg_incomplete = 0;
12928#endif
12929				goto do_a_copy_in;
12930
12931			}
12932		}
12933		while (uio->uio_resid > 0) {
12934			/* How much room do we have? */
12935			struct mbuf *new_tail, *mm;
12936
12937			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12938				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12939			else
12940				max_len = 0;
12941
12942			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12943			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12944			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12945				sndout = 0;
12946				new_tail = NULL;
12947				if (hold_tcblock) {
12948					SCTP_TCB_UNLOCK(stcb);
12949					hold_tcblock = 0;
12950				}
12951				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12952				if ((mm == NULL) || error) {
12953					if (mm) {
12954						sctp_m_freem(mm);
12955					}
12956					goto out;
12957				}
12958				/* Update the mbuf and count */
12959				SCTP_TCB_SEND_LOCK(stcb);
12960				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12961					/*
12962					 * we need to get out. Peer probably
12963					 * aborted.
12964					 */
12965					sctp_m_freem(mm);
12966					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12967						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12968						error = ECONNRESET;
12969					}
12970					SCTP_TCB_SEND_UNLOCK(stcb);
12971					goto out;
12972				}
12973				if (sp->tail_mbuf) {
12974					/* tack it to the end */
12975					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12976					sp->tail_mbuf = new_tail;
12977				} else {
12978					/* A stolen mbuf */
12979					sp->data = mm;
12980					sp->tail_mbuf = new_tail;
12981				}
12982				sctp_snd_sb_alloc(stcb, sndout);
12983				atomic_add_int(&sp->length, sndout);
12984				len += sndout;
12985
12986				/* Did we reach EOR? */
12987				if ((uio->uio_resid == 0) &&
12988				    ((user_marks_eor == 0) ||
12989				    (srcv->sinfo_flags & SCTP_EOF) ||
12990				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12991					sp->msg_is_complete = 1;
12992				} else {
12993					sp->msg_is_complete = 0;
12994				}
12995				SCTP_TCB_SEND_UNLOCK(stcb);
12996			}
12997			if (uio->uio_resid == 0) {
12998				/* got it all? */
12999				continue;
13000			}
13001			/* PR-SCTP? */
13002			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13003				/*
13004				 * This is ugly but we must assure locking
13005				 * order
13006				 */
13007				if (hold_tcblock == 0) {
13008					SCTP_TCB_LOCK(stcb);
13009					hold_tcblock = 1;
13010				}
13011				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13012				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13013				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13014					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13015				else
13016					max_len = 0;
13017				if (max_len > 0) {
13018					continue;
13019				}
13020				SCTP_TCB_UNLOCK(stcb);
13021				hold_tcblock = 0;
13022			}
13023			/* wait for space now */
13024			if (non_blocking) {
13025				/* Non-blocking io in place out */
13026				goto skip_out_eof;
13027			}
13028			/* What about the INIT, send it maybe */
13029			if (queue_only_for_init) {
13030				if (hold_tcblock == 0) {
13031					SCTP_TCB_LOCK(stcb);
13032					hold_tcblock = 1;
13033				}
13034				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13035					/* a collision took us forward? */
13036					queue_only = 0;
13037				} else {
13038					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13039					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13040					queue_only = 1;
13041				}
13042			}
13043			if ((net->flight_size > net->cwnd) &&
13044			    (asoc->sctp_cmt_on_off == 0)) {
13045				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13046				queue_only = 1;
13047			} else if (asoc->ifp_had_enobuf) {
13048				SCTP_STAT_INCR(sctps_ifnomemqueued);
13049				if (net->flight_size > (2 * net->mtu)) {
13050					queue_only = 1;
13051				}
13052				asoc->ifp_had_enobuf = 0;
13053			}
13054			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13055			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13056			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13057			    (stcb->asoc.total_flight > 0) &&
13058			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13059			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13060
13061				/*-
13062				 * Ok, Nagle is set on and we have data outstanding.
13063				 * Don't send anything and let SACKs drive out the
13064				 * data unless wen have a "full" segment to send.
13065				 */
13066				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13067					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13068				}
13069				SCTP_STAT_INCR(sctps_naglequeued);
13070				nagle_applies = 1;
13071			} else {
13072				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13073					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13074						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13075				}
13076				SCTP_STAT_INCR(sctps_naglesent);
13077				nagle_applies = 0;
13078			}
13079			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13080
13081				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13082				    nagle_applies, un_sent);
13083				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13084				    stcb->asoc.total_flight,
13085				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13086			}
13087			if (queue_only_for_init)
13088				queue_only_for_init = 0;
13089			if ((queue_only == 0) && (nagle_applies == 0)) {
13090				/*-
13091				 * need to start chunk output
13092				 * before blocking.. note that if
13093				 * a lock is already applied, then
13094				 * the input via the net is happening
13095				 * and I don't need to start output :-D
13096				 */
13097				if (hold_tcblock == 0) {
13098					if (SCTP_TCB_TRYLOCK(stcb)) {
13099						hold_tcblock = 1;
13100						sctp_chunk_output(inp,
13101						    stcb,
13102						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13103					}
13104				} else {
13105					sctp_chunk_output(inp,
13106					    stcb,
13107					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13108				}
13109				if (hold_tcblock == 1) {
13110					SCTP_TCB_UNLOCK(stcb);
13111					hold_tcblock = 0;
13112				}
13113			}
13114			SOCKBUF_LOCK(&so->so_snd);
13115			/*-
13116			 * This is a bit strange, but I think it will
13117			 * work. The total_output_queue_size is locked and
13118			 * protected by the TCB_LOCK, which we just released.
13119			 * There is a race that can occur between releasing it
13120			 * above, and me getting the socket lock, where sacks
13121			 * come in but we have not put the SB_WAIT on the
13122			 * so_snd buffer to get the wakeup. After the LOCK
13123			 * is applied the sack_processing will also need to
13124			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13125			 * once we have the socket buffer lock if we recheck the
13126			 * size we KNOW we will get to sleep safely with the
13127			 * wakeup flag in place.
13128			 */
13129			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13130			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13131				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13132					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13133					    asoc, uio->uio_resid);
13134				}
13135				be.error = 0;
13136				stcb->block_entry = &be;
13137				error = sbwait(&so->so_snd);
13138				stcb->block_entry = NULL;
13139
13140				if (error || so->so_error || be.error) {
13141					if (error == 0) {
13142						if (so->so_error)
13143							error = so->so_error;
13144						if (be.error) {
13145							error = be.error;
13146						}
13147					}
13148					SOCKBUF_UNLOCK(&so->so_snd);
13149					goto out_unlocked;
13150				}
13151				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13152					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13153					    asoc, stcb->asoc.total_output_queue_size);
13154				}
13155			}
13156			SOCKBUF_UNLOCK(&so->so_snd);
13157			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13158				goto out_unlocked;
13159			}
13160		}
13161		SCTP_TCB_SEND_LOCK(stcb);
13162		if (sp) {
13163			if (sp->msg_is_complete == 0) {
13164				strm->last_msg_incomplete = 1;
13165				asoc->stream_locked = 1;
13166				asoc->stream_locked_on = srcv->sinfo_stream;
13167			} else {
13168				sp->sender_all_done = 1;
13169				strm->last_msg_incomplete = 0;
13170				asoc->stream_locked = 0;
13171			}
13172		} else {
13173			SCTP_PRINTF("Huh no sp TSNH?\n");
13174			strm->last_msg_incomplete = 0;
13175			asoc->stream_locked = 0;
13176		}
13177		SCTP_TCB_SEND_UNLOCK(stcb);
13178		if (uio->uio_resid == 0) {
13179			got_all_of_the_send = 1;
13180		}
13181	} else {
13182		/* We send in a 0, since we do NOT have any locks */
13183		error = sctp_msg_append(stcb, net, top, srcv, 0);
13184		top = NULL;
13185		if (srcv->sinfo_flags & SCTP_EOF) {
13186			/*
13187			 * This should only happen for Panda for the mbuf
13188			 * send case, which does NOT yet support EEOR mode.
13189			 * Thus, we can just set this flag to do the proper
13190			 * EOF handling.
13191			 */
13192			got_all_of_the_send = 1;
13193		}
13194	}
13195	if (error) {
13196		goto out;
13197	}
13198dataless_eof:
13199	/* EOF thing ? */
13200	if ((srcv->sinfo_flags & SCTP_EOF) &&
13201	    (got_all_of_the_send == 1)) {
13202		int cnt;
13203
13204		SCTP_STAT_INCR(sctps_sends_with_eof);
13205		error = 0;
13206		if (hold_tcblock == 0) {
13207			SCTP_TCB_LOCK(stcb);
13208			hold_tcblock = 1;
13209		}
13210		cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13211		if (TAILQ_EMPTY(&asoc->send_queue) &&
13212		    TAILQ_EMPTY(&asoc->sent_queue) &&
13213		    (cnt == 0)) {
13214			if (asoc->locked_on_sending) {
13215				goto abort_anyway;
13216			}
13217			/* there is nothing queued to send, so I'm done... */
13218			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13219			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13220			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13221				struct sctp_nets *netp;
13222
13223				/* only send SHUTDOWN the first time through */
13224				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13225					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13226				}
13227				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13228				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13229				sctp_stop_timers_for_shutdown(stcb);
13230				if (stcb->asoc.alternate) {
13231					netp = stcb->asoc.alternate;
13232				} else {
13233					netp = stcb->asoc.primary_destination;
13234				}
13235				sctp_send_shutdown(stcb, netp);
13236				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13237				    netp);
13238				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13239				    asoc->primary_destination);
13240			}
13241		} else {
13242			/*-
13243			 * we still got (or just got) data to send, so set
13244			 * SHUTDOWN_PENDING
13245			 */
13246			/*-
13247			 * XXX sockets draft says that SCTP_EOF should be
13248			 * sent with no data.  currently, we will allow user
13249			 * data to be sent first and move to
13250			 * SHUTDOWN-PENDING
13251			 */
13252			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13253			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13254			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13255				if (hold_tcblock == 0) {
13256					SCTP_TCB_LOCK(stcb);
13257					hold_tcblock = 1;
13258				}
13259				if (asoc->locked_on_sending) {
13260					/* Locked to send out the data */
13261					struct sctp_stream_queue_pending *sp;
13262
13263					sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13264					if (sp) {
13265						if ((sp->length == 0) && (sp->msg_is_complete == 0))
13266							asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13267					}
13268				}
13269				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13270				if (TAILQ_EMPTY(&asoc->send_queue) &&
13271				    TAILQ_EMPTY(&asoc->sent_queue) &&
13272				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13273			abort_anyway:
13274					if (free_cnt_applied) {
13275						atomic_add_int(&stcb->asoc.refcnt, -1);
13276						free_cnt_applied = 0;
13277					}
13278					sctp_abort_an_association(stcb->sctp_ep, stcb,
13279					    NULL, SCTP_SO_LOCKED);
13280					/*
13281					 * now relock the stcb so everything
13282					 * is sane
13283					 */
13284					hold_tcblock = 0;
13285					stcb = NULL;
13286					goto out;
13287				}
13288				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13289				    asoc->primary_destination);
13290				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13291			}
13292		}
13293	}
13294skip_out_eof:
13295	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13296		some_on_control = 1;
13297	}
13298	if (queue_only_for_init) {
13299		if (hold_tcblock == 0) {
13300			SCTP_TCB_LOCK(stcb);
13301			hold_tcblock = 1;
13302		}
13303		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13304			/* a collision took us forward? */
13305			queue_only = 0;
13306		} else {
13307			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13308			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13309			queue_only = 1;
13310		}
13311	}
13312	if ((net->flight_size > net->cwnd) &&
13313	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13314		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13315		queue_only = 1;
13316	} else if (asoc->ifp_had_enobuf) {
13317		SCTP_STAT_INCR(sctps_ifnomemqueued);
13318		if (net->flight_size > (2 * net->mtu)) {
13319			queue_only = 1;
13320		}
13321		asoc->ifp_had_enobuf = 0;
13322	}
13323	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13324	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13325	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13326	    (stcb->asoc.total_flight > 0) &&
13327	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13328	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13329		/*-
13330		 * Ok, Nagle is set on and we have data outstanding.
13331		 * Don't send anything and let SACKs drive out the
13332		 * data unless wen have a "full" segment to send.
13333		 */
13334		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13335			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13336		}
13337		SCTP_STAT_INCR(sctps_naglequeued);
13338		nagle_applies = 1;
13339	} else {
13340		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13341			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13342				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13343		}
13344		SCTP_STAT_INCR(sctps_naglesent);
13345		nagle_applies = 0;
13346	}
13347	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13348		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13349		    nagle_applies, un_sent);
13350		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13351		    stcb->asoc.total_flight,
13352		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13353	}
13354	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13355		/* we can attempt to send too. */
13356		if (hold_tcblock == 0) {
13357			/*
13358			 * If there is activity recv'ing sacks no need to
13359			 * send
13360			 */
13361			if (SCTP_TCB_TRYLOCK(stcb)) {
13362				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13363				hold_tcblock = 1;
13364			}
13365		} else {
13366			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13367		}
13368	} else if ((queue_only == 0) &&
13369		    (stcb->asoc.peers_rwnd == 0) &&
13370	    (stcb->asoc.total_flight == 0)) {
13371		/* We get to have a probe outstanding */
13372		if (hold_tcblock == 0) {
13373			hold_tcblock = 1;
13374			SCTP_TCB_LOCK(stcb);
13375		}
13376		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13377	} else if (some_on_control) {
13378		int num_out, reason, frag_point;
13379
13380		/* Here we do control only */
13381		if (hold_tcblock == 0) {
13382			hold_tcblock = 1;
13383			SCTP_TCB_LOCK(stcb);
13384		}
13385		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13386		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13387		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13388	}
13389	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13390	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13391	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13392	    stcb->asoc.total_output_queue_size, error);
13393
13394out:
13395out_unlocked:
13396
13397	if (local_soresv && stcb) {
13398		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13399	}
13400	if (create_lock_applied) {
13401		SCTP_ASOC_CREATE_UNLOCK(inp);
13402	}
13403	if ((stcb) && hold_tcblock) {
13404		SCTP_TCB_UNLOCK(stcb);
13405	}
13406	if (stcb && free_cnt_applied) {
13407		atomic_add_int(&stcb->asoc.refcnt, -1);
13408	}
13409#ifdef INVARIANTS
13410	if (stcb) {
13411		if (mtx_owned(&stcb->tcb_mtx)) {
13412			panic("Leaving with tcb mtx owned?");
13413		}
13414		if (mtx_owned(&stcb->tcb_send_mtx)) {
13415			panic("Leaving with tcb send mtx owned?");
13416		}
13417	}
13418#endif
13419#ifdef INVARIANTS
13420	if (inp) {
13421		sctp_validate_no_locks(inp);
13422	} else {
13423		SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13424	}
13425#endif
13426	if (top) {
13427		sctp_m_freem(top);
13428	}
13429	if (control) {
13430		sctp_m_freem(control);
13431	}
13432	return (error);
13433}
13434
13435
13436/*
13437 * generate an AUTHentication chunk, if required
13438 */
13439struct mbuf *
13440sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13441    struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13442    struct sctp_tcb *stcb, uint8_t chunk)
13443{
13444	struct mbuf *m_auth;
13445	struct sctp_auth_chunk *auth;
13446	int chunk_len;
13447	struct mbuf *cn;
13448
13449	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13450	    (stcb == NULL))
13451		return (m);
13452
13453	if (stcb->asoc.auth_supported == 0) {
13454		return (m);
13455	}
13456	/* does the requested chunk require auth? */
13457	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13458		return (m);
13459	}
13460	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13461	if (m_auth == NULL) {
13462		/* no mbuf's */
13463		return (m);
13464	}
13465	/* reserve some space if this will be the first mbuf */
13466	if (m == NULL)
13467		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13468	/* fill in the AUTH chunk details */
13469	auth = mtod(m_auth, struct sctp_auth_chunk *);
13470	bzero(auth, sizeof(*auth));
13471	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13472	auth->ch.chunk_flags = 0;
13473	chunk_len = sizeof(*auth) +
13474	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13475	auth->ch.chunk_length = htons(chunk_len);
13476	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13477	/* key id and hmac digest will be computed and filled in upon send */
13478
13479	/* save the offset where the auth was inserted into the chain */
13480	*offset = 0;
13481	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13482		*offset += SCTP_BUF_LEN(cn);
13483	}
13484
13485	/* update length and return pointer to the auth chunk */
13486	SCTP_BUF_LEN(m_auth) = chunk_len;
13487	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13488	if (auth_ret != NULL)
13489		*auth_ret = auth;
13490
13491	return (m);
13492}
13493
13494#ifdef INET6
13495int
13496sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13497{
13498	struct nd_prefix *pfx = NULL;
13499	struct nd_pfxrouter *pfxrtr = NULL;
13500	struct sockaddr_in6 gw6;
13501
13502	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13503		return (0);
13504
13505	/* get prefix entry of address */
13506	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13507		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13508			continue;
13509		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13510		    &src6->sin6_addr, &pfx->ndpr_mask))
13511			break;
13512	}
13513	/* no prefix entry in the prefix list */
13514	if (pfx == NULL) {
13515		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13516		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13517		return (0);
13518	}
13519	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13520	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13521
13522	/* search installed gateway from prefix entry */
13523	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13524		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13525		gw6.sin6_family = AF_INET6;
13526		gw6.sin6_len = sizeof(struct sockaddr_in6);
13527		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13528		    sizeof(struct in6_addr));
13529		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13530		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13531		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13532		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13533		if (sctp_cmpaddr((struct sockaddr *)&gw6,
13534		    ro->ro_rt->rt_gateway)) {
13535			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13536			return (1);
13537		}
13538	}
13539	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13540	return (0);
13541}
13542
13543#endif
13544
13545int
13546sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13547{
13548#ifdef INET
13549	struct sockaddr_in *sin, *mask;
13550	struct ifaddr *ifa;
13551	struct in_addr srcnetaddr, gwnetaddr;
13552
13553	if (ro == NULL || ro->ro_rt == NULL ||
13554	    sifa->address.sa.sa_family != AF_INET) {
13555		return (0);
13556	}
13557	ifa = (struct ifaddr *)sifa->ifa;
13558	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13559	sin = &sifa->address.sin;
13560	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13561	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13562	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13563	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13564
13565	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13566	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13567	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13568	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13569	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13570	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13571		return (1);
13572	}
13573#endif
13574	return (0);
13575}
13576