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("$FreeBSD$");
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#include <netinet/udp.h>
54#include <netinet/udp_var.h>
55#include <machine/in_cksum.h>
56
57
58
59#define SCTP_MAX_GAPS_INARRAY 4
60struct sack_track {
61	uint8_t right_edge;	/* mergable on the right edge */
62	uint8_t left_edge;	/* mergable on the left edge */
63	uint8_t num_entries;
64	uint8_t spare;
65	struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
66};
67
68struct sack_track sack_array[256] = {
69	{0, 0, 0, 0,		/* 0x00 */
70		{{0, 0},
71		{0, 0},
72		{0, 0},
73		{0, 0}
74		}
75	},
76	{1, 0, 1, 0,		/* 0x01 */
77		{{0, 0},
78		{0, 0},
79		{0, 0},
80		{0, 0}
81		}
82	},
83	{0, 0, 1, 0,		/* 0x02 */
84		{{1, 1},
85		{0, 0},
86		{0, 0},
87		{0, 0}
88		}
89	},
90	{1, 0, 1, 0,		/* 0x03 */
91		{{0, 1},
92		{0, 0},
93		{0, 0},
94		{0, 0}
95		}
96	},
97	{0, 0, 1, 0,		/* 0x04 */
98		{{2, 2},
99		{0, 0},
100		{0, 0},
101		{0, 0}
102		}
103	},
104	{1, 0, 2, 0,		/* 0x05 */
105		{{0, 0},
106		{2, 2},
107		{0, 0},
108		{0, 0}
109		}
110	},
111	{0, 0, 1, 0,		/* 0x06 */
112		{{1, 2},
113		{0, 0},
114		{0, 0},
115		{0, 0}
116		}
117	},
118	{1, 0, 1, 0,		/* 0x07 */
119		{{0, 2},
120		{0, 0},
121		{0, 0},
122		{0, 0}
123		}
124	},
125	{0, 0, 1, 0,		/* 0x08 */
126		{{3, 3},
127		{0, 0},
128		{0, 0},
129		{0, 0}
130		}
131	},
132	{1, 0, 2, 0,		/* 0x09 */
133		{{0, 0},
134		{3, 3},
135		{0, 0},
136		{0, 0}
137		}
138	},
139	{0, 0, 2, 0,		/* 0x0a */
140		{{1, 1},
141		{3, 3},
142		{0, 0},
143		{0, 0}
144		}
145	},
146	{1, 0, 2, 0,		/* 0x0b */
147		{{0, 1},
148		{3, 3},
149		{0, 0},
150		{0, 0}
151		}
152	},
153	{0, 0, 1, 0,		/* 0x0c */
154		{{2, 3},
155		{0, 0},
156		{0, 0},
157		{0, 0}
158		}
159	},
160	{1, 0, 2, 0,		/* 0x0d */
161		{{0, 0},
162		{2, 3},
163		{0, 0},
164		{0, 0}
165		}
166	},
167	{0, 0, 1, 0,		/* 0x0e */
168		{{1, 3},
169		{0, 0},
170		{0, 0},
171		{0, 0}
172		}
173	},
174	{1, 0, 1, 0,		/* 0x0f */
175		{{0, 3},
176		{0, 0},
177		{0, 0},
178		{0, 0}
179		}
180	},
181	{0, 0, 1, 0,		/* 0x10 */
182		{{4, 4},
183		{0, 0},
184		{0, 0},
185		{0, 0}
186		}
187	},
188	{1, 0, 2, 0,		/* 0x11 */
189		{{0, 0},
190		{4, 4},
191		{0, 0},
192		{0, 0}
193		}
194	},
195	{0, 0, 2, 0,		/* 0x12 */
196		{{1, 1},
197		{4, 4},
198		{0, 0},
199		{0, 0}
200		}
201	},
202	{1, 0, 2, 0,		/* 0x13 */
203		{{0, 1},
204		{4, 4},
205		{0, 0},
206		{0, 0}
207		}
208	},
209	{0, 0, 2, 0,		/* 0x14 */
210		{{2, 2},
211		{4, 4},
212		{0, 0},
213		{0, 0}
214		}
215	},
216	{1, 0, 3, 0,		/* 0x15 */
217		{{0, 0},
218		{2, 2},
219		{4, 4},
220		{0, 0}
221		}
222	},
223	{0, 0, 2, 0,		/* 0x16 */
224		{{1, 2},
225		{4, 4},
226		{0, 0},
227		{0, 0}
228		}
229	},
230	{1, 0, 2, 0,		/* 0x17 */
231		{{0, 2},
232		{4, 4},
233		{0, 0},
234		{0, 0}
235		}
236	},
237	{0, 0, 1, 0,		/* 0x18 */
238		{{3, 4},
239		{0, 0},
240		{0, 0},
241		{0, 0}
242		}
243	},
244	{1, 0, 2, 0,		/* 0x19 */
245		{{0, 0},
246		{3, 4},
247		{0, 0},
248		{0, 0}
249		}
250	},
251	{0, 0, 2, 0,		/* 0x1a */
252		{{1, 1},
253		{3, 4},
254		{0, 0},
255		{0, 0}
256		}
257	},
258	{1, 0, 2, 0,		/* 0x1b */
259		{{0, 1},
260		{3, 4},
261		{0, 0},
262		{0, 0}
263		}
264	},
265	{0, 0, 1, 0,		/* 0x1c */
266		{{2, 4},
267		{0, 0},
268		{0, 0},
269		{0, 0}
270		}
271	},
272	{1, 0, 2, 0,		/* 0x1d */
273		{{0, 0},
274		{2, 4},
275		{0, 0},
276		{0, 0}
277		}
278	},
279	{0, 0, 1, 0,		/* 0x1e */
280		{{1, 4},
281		{0, 0},
282		{0, 0},
283		{0, 0}
284		}
285	},
286	{1, 0, 1, 0,		/* 0x1f */
287		{{0, 4},
288		{0, 0},
289		{0, 0},
290		{0, 0}
291		}
292	},
293	{0, 0, 1, 0,		/* 0x20 */
294		{{5, 5},
295		{0, 0},
296		{0, 0},
297		{0, 0}
298		}
299	},
300	{1, 0, 2, 0,		/* 0x21 */
301		{{0, 0},
302		{5, 5},
303		{0, 0},
304		{0, 0}
305		}
306	},
307	{0, 0, 2, 0,		/* 0x22 */
308		{{1, 1},
309		{5, 5},
310		{0, 0},
311		{0, 0}
312		}
313	},
314	{1, 0, 2, 0,		/* 0x23 */
315		{{0, 1},
316		{5, 5},
317		{0, 0},
318		{0, 0}
319		}
320	},
321	{0, 0, 2, 0,		/* 0x24 */
322		{{2, 2},
323		{5, 5},
324		{0, 0},
325		{0, 0}
326		}
327	},
328	{1, 0, 3, 0,		/* 0x25 */
329		{{0, 0},
330		{2, 2},
331		{5, 5},
332		{0, 0}
333		}
334	},
335	{0, 0, 2, 0,		/* 0x26 */
336		{{1, 2},
337		{5, 5},
338		{0, 0},
339		{0, 0}
340		}
341	},
342	{1, 0, 2, 0,		/* 0x27 */
343		{{0, 2},
344		{5, 5},
345		{0, 0},
346		{0, 0}
347		}
348	},
349	{0, 0, 2, 0,		/* 0x28 */
350		{{3, 3},
351		{5, 5},
352		{0, 0},
353		{0, 0}
354		}
355	},
356	{1, 0, 3, 0,		/* 0x29 */
357		{{0, 0},
358		{3, 3},
359		{5, 5},
360		{0, 0}
361		}
362	},
363	{0, 0, 3, 0,		/* 0x2a */
364		{{1, 1},
365		{3, 3},
366		{5, 5},
367		{0, 0}
368		}
369	},
370	{1, 0, 3, 0,		/* 0x2b */
371		{{0, 1},
372		{3, 3},
373		{5, 5},
374		{0, 0}
375		}
376	},
377	{0, 0, 2, 0,		/* 0x2c */
378		{{2, 3},
379		{5, 5},
380		{0, 0},
381		{0, 0}
382		}
383	},
384	{1, 0, 3, 0,		/* 0x2d */
385		{{0, 0},
386		{2, 3},
387		{5, 5},
388		{0, 0}
389		}
390	},
391	{0, 0, 2, 0,		/* 0x2e */
392		{{1, 3},
393		{5, 5},
394		{0, 0},
395		{0, 0}
396		}
397	},
398	{1, 0, 2, 0,		/* 0x2f */
399		{{0, 3},
400		{5, 5},
401		{0, 0},
402		{0, 0}
403		}
404	},
405	{0, 0, 1, 0,		/* 0x30 */
406		{{4, 5},
407		{0, 0},
408		{0, 0},
409		{0, 0}
410		}
411	},
412	{1, 0, 2, 0,		/* 0x31 */
413		{{0, 0},
414		{4, 5},
415		{0, 0},
416		{0, 0}
417		}
418	},
419	{0, 0, 2, 0,		/* 0x32 */
420		{{1, 1},
421		{4, 5},
422		{0, 0},
423		{0, 0}
424		}
425	},
426	{1, 0, 2, 0,		/* 0x33 */
427		{{0, 1},
428		{4, 5},
429		{0, 0},
430		{0, 0}
431		}
432	},
433	{0, 0, 2, 0,		/* 0x34 */
434		{{2, 2},
435		{4, 5},
436		{0, 0},
437		{0, 0}
438		}
439	},
440	{1, 0, 3, 0,		/* 0x35 */
441		{{0, 0},
442		{2, 2},
443		{4, 5},
444		{0, 0}
445		}
446	},
447	{0, 0, 2, 0,		/* 0x36 */
448		{{1, 2},
449		{4, 5},
450		{0, 0},
451		{0, 0}
452		}
453	},
454	{1, 0, 2, 0,		/* 0x37 */
455		{{0, 2},
456		{4, 5},
457		{0, 0},
458		{0, 0}
459		}
460	},
461	{0, 0, 1, 0,		/* 0x38 */
462		{{3, 5},
463		{0, 0},
464		{0, 0},
465		{0, 0}
466		}
467	},
468	{1, 0, 2, 0,		/* 0x39 */
469		{{0, 0},
470		{3, 5},
471		{0, 0},
472		{0, 0}
473		}
474	},
475	{0, 0, 2, 0,		/* 0x3a */
476		{{1, 1},
477		{3, 5},
478		{0, 0},
479		{0, 0}
480		}
481	},
482	{1, 0, 2, 0,		/* 0x3b */
483		{{0, 1},
484		{3, 5},
485		{0, 0},
486		{0, 0}
487		}
488	},
489	{0, 0, 1, 0,		/* 0x3c */
490		{{2, 5},
491		{0, 0},
492		{0, 0},
493		{0, 0}
494		}
495	},
496	{1, 0, 2, 0,		/* 0x3d */
497		{{0, 0},
498		{2, 5},
499		{0, 0},
500		{0, 0}
501		}
502	},
503	{0, 0, 1, 0,		/* 0x3e */
504		{{1, 5},
505		{0, 0},
506		{0, 0},
507		{0, 0}
508		}
509	},
510	{1, 0, 1, 0,		/* 0x3f */
511		{{0, 5},
512		{0, 0},
513		{0, 0},
514		{0, 0}
515		}
516	},
517	{0, 0, 1, 0,		/* 0x40 */
518		{{6, 6},
519		{0, 0},
520		{0, 0},
521		{0, 0}
522		}
523	},
524	{1, 0, 2, 0,		/* 0x41 */
525		{{0, 0},
526		{6, 6},
527		{0, 0},
528		{0, 0}
529		}
530	},
531	{0, 0, 2, 0,		/* 0x42 */
532		{{1, 1},
533		{6, 6},
534		{0, 0},
535		{0, 0}
536		}
537	},
538	{1, 0, 2, 0,		/* 0x43 */
539		{{0, 1},
540		{6, 6},
541		{0, 0},
542		{0, 0}
543		}
544	},
545	{0, 0, 2, 0,		/* 0x44 */
546		{{2, 2},
547		{6, 6},
548		{0, 0},
549		{0, 0}
550		}
551	},
552	{1, 0, 3, 0,		/* 0x45 */
553		{{0, 0},
554		{2, 2},
555		{6, 6},
556		{0, 0}
557		}
558	},
559	{0, 0, 2, 0,		/* 0x46 */
560		{{1, 2},
561		{6, 6},
562		{0, 0},
563		{0, 0}
564		}
565	},
566	{1, 0, 2, 0,		/* 0x47 */
567		{{0, 2},
568		{6, 6},
569		{0, 0},
570		{0, 0}
571		}
572	},
573	{0, 0, 2, 0,		/* 0x48 */
574		{{3, 3},
575		{6, 6},
576		{0, 0},
577		{0, 0}
578		}
579	},
580	{1, 0, 3, 0,		/* 0x49 */
581		{{0, 0},
582		{3, 3},
583		{6, 6},
584		{0, 0}
585		}
586	},
587	{0, 0, 3, 0,		/* 0x4a */
588		{{1, 1},
589		{3, 3},
590		{6, 6},
591		{0, 0}
592		}
593	},
594	{1, 0, 3, 0,		/* 0x4b */
595		{{0, 1},
596		{3, 3},
597		{6, 6},
598		{0, 0}
599		}
600	},
601	{0, 0, 2, 0,		/* 0x4c */
602		{{2, 3},
603		{6, 6},
604		{0, 0},
605		{0, 0}
606		}
607	},
608	{1, 0, 3, 0,		/* 0x4d */
609		{{0, 0},
610		{2, 3},
611		{6, 6},
612		{0, 0}
613		}
614	},
615	{0, 0, 2, 0,		/* 0x4e */
616		{{1, 3},
617		{6, 6},
618		{0, 0},
619		{0, 0}
620		}
621	},
622	{1, 0, 2, 0,		/* 0x4f */
623		{{0, 3},
624		{6, 6},
625		{0, 0},
626		{0, 0}
627		}
628	},
629	{0, 0, 2, 0,		/* 0x50 */
630		{{4, 4},
631		{6, 6},
632		{0, 0},
633		{0, 0}
634		}
635	},
636	{1, 0, 3, 0,		/* 0x51 */
637		{{0, 0},
638		{4, 4},
639		{6, 6},
640		{0, 0}
641		}
642	},
643	{0, 0, 3, 0,		/* 0x52 */
644		{{1, 1},
645		{4, 4},
646		{6, 6},
647		{0, 0}
648		}
649	},
650	{1, 0, 3, 0,		/* 0x53 */
651		{{0, 1},
652		{4, 4},
653		{6, 6},
654		{0, 0}
655		}
656	},
657	{0, 0, 3, 0,		/* 0x54 */
658		{{2, 2},
659		{4, 4},
660		{6, 6},
661		{0, 0}
662		}
663	},
664	{1, 0, 4, 0,		/* 0x55 */
665		{{0, 0},
666		{2, 2},
667		{4, 4},
668		{6, 6}
669		}
670	},
671	{0, 0, 3, 0,		/* 0x56 */
672		{{1, 2},
673		{4, 4},
674		{6, 6},
675		{0, 0}
676		}
677	},
678	{1, 0, 3, 0,		/* 0x57 */
679		{{0, 2},
680		{4, 4},
681		{6, 6},
682		{0, 0}
683		}
684	},
685	{0, 0, 2, 0,		/* 0x58 */
686		{{3, 4},
687		{6, 6},
688		{0, 0},
689		{0, 0}
690		}
691	},
692	{1, 0, 3, 0,		/* 0x59 */
693		{{0, 0},
694		{3, 4},
695		{6, 6},
696		{0, 0}
697		}
698	},
699	{0, 0, 3, 0,		/* 0x5a */
700		{{1, 1},
701		{3, 4},
702		{6, 6},
703		{0, 0}
704		}
705	},
706	{1, 0, 3, 0,		/* 0x5b */
707		{{0, 1},
708		{3, 4},
709		{6, 6},
710		{0, 0}
711		}
712	},
713	{0, 0, 2, 0,		/* 0x5c */
714		{{2, 4},
715		{6, 6},
716		{0, 0},
717		{0, 0}
718		}
719	},
720	{1, 0, 3, 0,		/* 0x5d */
721		{{0, 0},
722		{2, 4},
723		{6, 6},
724		{0, 0}
725		}
726	},
727	{0, 0, 2, 0,		/* 0x5e */
728		{{1, 4},
729		{6, 6},
730		{0, 0},
731		{0, 0}
732		}
733	},
734	{1, 0, 2, 0,		/* 0x5f */
735		{{0, 4},
736		{6, 6},
737		{0, 0},
738		{0, 0}
739		}
740	},
741	{0, 0, 1, 0,		/* 0x60 */
742		{{5, 6},
743		{0, 0},
744		{0, 0},
745		{0, 0}
746		}
747	},
748	{1, 0, 2, 0,		/* 0x61 */
749		{{0, 0},
750		{5, 6},
751		{0, 0},
752		{0, 0}
753		}
754	},
755	{0, 0, 2, 0,		/* 0x62 */
756		{{1, 1},
757		{5, 6},
758		{0, 0},
759		{0, 0}
760		}
761	},
762	{1, 0, 2, 0,		/* 0x63 */
763		{{0, 1},
764		{5, 6},
765		{0, 0},
766		{0, 0}
767		}
768	},
769	{0, 0, 2, 0,		/* 0x64 */
770		{{2, 2},
771		{5, 6},
772		{0, 0},
773		{0, 0}
774		}
775	},
776	{1, 0, 3, 0,		/* 0x65 */
777		{{0, 0},
778		{2, 2},
779		{5, 6},
780		{0, 0}
781		}
782	},
783	{0, 0, 2, 0,		/* 0x66 */
784		{{1, 2},
785		{5, 6},
786		{0, 0},
787		{0, 0}
788		}
789	},
790	{1, 0, 2, 0,		/* 0x67 */
791		{{0, 2},
792		{5, 6},
793		{0, 0},
794		{0, 0}
795		}
796	},
797	{0, 0, 2, 0,		/* 0x68 */
798		{{3, 3},
799		{5, 6},
800		{0, 0},
801		{0, 0}
802		}
803	},
804	{1, 0, 3, 0,		/* 0x69 */
805		{{0, 0},
806		{3, 3},
807		{5, 6},
808		{0, 0}
809		}
810	},
811	{0, 0, 3, 0,		/* 0x6a */
812		{{1, 1},
813		{3, 3},
814		{5, 6},
815		{0, 0}
816		}
817	},
818	{1, 0, 3, 0,		/* 0x6b */
819		{{0, 1},
820		{3, 3},
821		{5, 6},
822		{0, 0}
823		}
824	},
825	{0, 0, 2, 0,		/* 0x6c */
826		{{2, 3},
827		{5, 6},
828		{0, 0},
829		{0, 0}
830		}
831	},
832	{1, 0, 3, 0,		/* 0x6d */
833		{{0, 0},
834		{2, 3},
835		{5, 6},
836		{0, 0}
837		}
838	},
839	{0, 0, 2, 0,		/* 0x6e */
840		{{1, 3},
841		{5, 6},
842		{0, 0},
843		{0, 0}
844		}
845	},
846	{1, 0, 2, 0,		/* 0x6f */
847		{{0, 3},
848		{5, 6},
849		{0, 0},
850		{0, 0}
851		}
852	},
853	{0, 0, 1, 0,		/* 0x70 */
854		{{4, 6},
855		{0, 0},
856		{0, 0},
857		{0, 0}
858		}
859	},
860	{1, 0, 2, 0,		/* 0x71 */
861		{{0, 0},
862		{4, 6},
863		{0, 0},
864		{0, 0}
865		}
866	},
867	{0, 0, 2, 0,		/* 0x72 */
868		{{1, 1},
869		{4, 6},
870		{0, 0},
871		{0, 0}
872		}
873	},
874	{1, 0, 2, 0,		/* 0x73 */
875		{{0, 1},
876		{4, 6},
877		{0, 0},
878		{0, 0}
879		}
880	},
881	{0, 0, 2, 0,		/* 0x74 */
882		{{2, 2},
883		{4, 6},
884		{0, 0},
885		{0, 0}
886		}
887	},
888	{1, 0, 3, 0,		/* 0x75 */
889		{{0, 0},
890		{2, 2},
891		{4, 6},
892		{0, 0}
893		}
894	},
895	{0, 0, 2, 0,		/* 0x76 */
896		{{1, 2},
897		{4, 6},
898		{0, 0},
899		{0, 0}
900		}
901	},
902	{1, 0, 2, 0,		/* 0x77 */
903		{{0, 2},
904		{4, 6},
905		{0, 0},
906		{0, 0}
907		}
908	},
909	{0, 0, 1, 0,		/* 0x78 */
910		{{3, 6},
911		{0, 0},
912		{0, 0},
913		{0, 0}
914		}
915	},
916	{1, 0, 2, 0,		/* 0x79 */
917		{{0, 0},
918		{3, 6},
919		{0, 0},
920		{0, 0}
921		}
922	},
923	{0, 0, 2, 0,		/* 0x7a */
924		{{1, 1},
925		{3, 6},
926		{0, 0},
927		{0, 0}
928		}
929	},
930	{1, 0, 2, 0,		/* 0x7b */
931		{{0, 1},
932		{3, 6},
933		{0, 0},
934		{0, 0}
935		}
936	},
937	{0, 0, 1, 0,		/* 0x7c */
938		{{2, 6},
939		{0, 0},
940		{0, 0},
941		{0, 0}
942		}
943	},
944	{1, 0, 2, 0,		/* 0x7d */
945		{{0, 0},
946		{2, 6},
947		{0, 0},
948		{0, 0}
949		}
950	},
951	{0, 0, 1, 0,		/* 0x7e */
952		{{1, 6},
953		{0, 0},
954		{0, 0},
955		{0, 0}
956		}
957	},
958	{1, 0, 1, 0,		/* 0x7f */
959		{{0, 6},
960		{0, 0},
961		{0, 0},
962		{0, 0}
963		}
964	},
965	{0, 1, 1, 0,		/* 0x80 */
966		{{7, 7},
967		{0, 0},
968		{0, 0},
969		{0, 0}
970		}
971	},
972	{1, 1, 2, 0,		/* 0x81 */
973		{{0, 0},
974		{7, 7},
975		{0, 0},
976		{0, 0}
977		}
978	},
979	{0, 1, 2, 0,		/* 0x82 */
980		{{1, 1},
981		{7, 7},
982		{0, 0},
983		{0, 0}
984		}
985	},
986	{1, 1, 2, 0,		/* 0x83 */
987		{{0, 1},
988		{7, 7},
989		{0, 0},
990		{0, 0}
991		}
992	},
993	{0, 1, 2, 0,		/* 0x84 */
994		{{2, 2},
995		{7, 7},
996		{0, 0},
997		{0, 0}
998		}
999	},
1000	{1, 1, 3, 0,		/* 0x85 */
1001		{{0, 0},
1002		{2, 2},
1003		{7, 7},
1004		{0, 0}
1005		}
1006	},
1007	{0, 1, 2, 0,		/* 0x86 */
1008		{{1, 2},
1009		{7, 7},
1010		{0, 0},
1011		{0, 0}
1012		}
1013	},
1014	{1, 1, 2, 0,		/* 0x87 */
1015		{{0, 2},
1016		{7, 7},
1017		{0, 0},
1018		{0, 0}
1019		}
1020	},
1021	{0, 1, 2, 0,		/* 0x88 */
1022		{{3, 3},
1023		{7, 7},
1024		{0, 0},
1025		{0, 0}
1026		}
1027	},
1028	{1, 1, 3, 0,		/* 0x89 */
1029		{{0, 0},
1030		{3, 3},
1031		{7, 7},
1032		{0, 0}
1033		}
1034	},
1035	{0, 1, 3, 0,		/* 0x8a */
1036		{{1, 1},
1037		{3, 3},
1038		{7, 7},
1039		{0, 0}
1040		}
1041	},
1042	{1, 1, 3, 0,		/* 0x8b */
1043		{{0, 1},
1044		{3, 3},
1045		{7, 7},
1046		{0, 0}
1047		}
1048	},
1049	{0, 1, 2, 0,		/* 0x8c */
1050		{{2, 3},
1051		{7, 7},
1052		{0, 0},
1053		{0, 0}
1054		}
1055	},
1056	{1, 1, 3, 0,		/* 0x8d */
1057		{{0, 0},
1058		{2, 3},
1059		{7, 7},
1060		{0, 0}
1061		}
1062	},
1063	{0, 1, 2, 0,		/* 0x8e */
1064		{{1, 3},
1065		{7, 7},
1066		{0, 0},
1067		{0, 0}
1068		}
1069	},
1070	{1, 1, 2, 0,		/* 0x8f */
1071		{{0, 3},
1072		{7, 7},
1073		{0, 0},
1074		{0, 0}
1075		}
1076	},
1077	{0, 1, 2, 0,		/* 0x90 */
1078		{{4, 4},
1079		{7, 7},
1080		{0, 0},
1081		{0, 0}
1082		}
1083	},
1084	{1, 1, 3, 0,		/* 0x91 */
1085		{{0, 0},
1086		{4, 4},
1087		{7, 7},
1088		{0, 0}
1089		}
1090	},
1091	{0, 1, 3, 0,		/* 0x92 */
1092		{{1, 1},
1093		{4, 4},
1094		{7, 7},
1095		{0, 0}
1096		}
1097	},
1098	{1, 1, 3, 0,		/* 0x93 */
1099		{{0, 1},
1100		{4, 4},
1101		{7, 7},
1102		{0, 0}
1103		}
1104	},
1105	{0, 1, 3, 0,		/* 0x94 */
1106		{{2, 2},
1107		{4, 4},
1108		{7, 7},
1109		{0, 0}
1110		}
1111	},
1112	{1, 1, 4, 0,		/* 0x95 */
1113		{{0, 0},
1114		{2, 2},
1115		{4, 4},
1116		{7, 7}
1117		}
1118	},
1119	{0, 1, 3, 0,		/* 0x96 */
1120		{{1, 2},
1121		{4, 4},
1122		{7, 7},
1123		{0, 0}
1124		}
1125	},
1126	{1, 1, 3, 0,		/* 0x97 */
1127		{{0, 2},
1128		{4, 4},
1129		{7, 7},
1130		{0, 0}
1131		}
1132	},
1133	{0, 1, 2, 0,		/* 0x98 */
1134		{{3, 4},
1135		{7, 7},
1136		{0, 0},
1137		{0, 0}
1138		}
1139	},
1140	{1, 1, 3, 0,		/* 0x99 */
1141		{{0, 0},
1142		{3, 4},
1143		{7, 7},
1144		{0, 0}
1145		}
1146	},
1147	{0, 1, 3, 0,		/* 0x9a */
1148		{{1, 1},
1149		{3, 4},
1150		{7, 7},
1151		{0, 0}
1152		}
1153	},
1154	{1, 1, 3, 0,		/* 0x9b */
1155		{{0, 1},
1156		{3, 4},
1157		{7, 7},
1158		{0, 0}
1159		}
1160	},
1161	{0, 1, 2, 0,		/* 0x9c */
1162		{{2, 4},
1163		{7, 7},
1164		{0, 0},
1165		{0, 0}
1166		}
1167	},
1168	{1, 1, 3, 0,		/* 0x9d */
1169		{{0, 0},
1170		{2, 4},
1171		{7, 7},
1172		{0, 0}
1173		}
1174	},
1175	{0, 1, 2, 0,		/* 0x9e */
1176		{{1, 4},
1177		{7, 7},
1178		{0, 0},
1179		{0, 0}
1180		}
1181	},
1182	{1, 1, 2, 0,		/* 0x9f */
1183		{{0, 4},
1184		{7, 7},
1185		{0, 0},
1186		{0, 0}
1187		}
1188	},
1189	{0, 1, 2, 0,		/* 0xa0 */
1190		{{5, 5},
1191		{7, 7},
1192		{0, 0},
1193		{0, 0}
1194		}
1195	},
1196	{1, 1, 3, 0,		/* 0xa1 */
1197		{{0, 0},
1198		{5, 5},
1199		{7, 7},
1200		{0, 0}
1201		}
1202	},
1203	{0, 1, 3, 0,		/* 0xa2 */
1204		{{1, 1},
1205		{5, 5},
1206		{7, 7},
1207		{0, 0}
1208		}
1209	},
1210	{1, 1, 3, 0,		/* 0xa3 */
1211		{{0, 1},
1212		{5, 5},
1213		{7, 7},
1214		{0, 0}
1215		}
1216	},
1217	{0, 1, 3, 0,		/* 0xa4 */
1218		{{2, 2},
1219		{5, 5},
1220		{7, 7},
1221		{0, 0}
1222		}
1223	},
1224	{1, 1, 4, 0,		/* 0xa5 */
1225		{{0, 0},
1226		{2, 2},
1227		{5, 5},
1228		{7, 7}
1229		}
1230	},
1231	{0, 1, 3, 0,		/* 0xa6 */
1232		{{1, 2},
1233		{5, 5},
1234		{7, 7},
1235		{0, 0}
1236		}
1237	},
1238	{1, 1, 3, 0,		/* 0xa7 */
1239		{{0, 2},
1240		{5, 5},
1241		{7, 7},
1242		{0, 0}
1243		}
1244	},
1245	{0, 1, 3, 0,		/* 0xa8 */
1246		{{3, 3},
1247		{5, 5},
1248		{7, 7},
1249		{0, 0}
1250		}
1251	},
1252	{1, 1, 4, 0,		/* 0xa9 */
1253		{{0, 0},
1254		{3, 3},
1255		{5, 5},
1256		{7, 7}
1257		}
1258	},
1259	{0, 1, 4, 0,		/* 0xaa */
1260		{{1, 1},
1261		{3, 3},
1262		{5, 5},
1263		{7, 7}
1264		}
1265	},
1266	{1, 1, 4, 0,		/* 0xab */
1267		{{0, 1},
1268		{3, 3},
1269		{5, 5},
1270		{7, 7}
1271		}
1272	},
1273	{0, 1, 3, 0,		/* 0xac */
1274		{{2, 3},
1275		{5, 5},
1276		{7, 7},
1277		{0, 0}
1278		}
1279	},
1280	{1, 1, 4, 0,		/* 0xad */
1281		{{0, 0},
1282		{2, 3},
1283		{5, 5},
1284		{7, 7}
1285		}
1286	},
1287	{0, 1, 3, 0,		/* 0xae */
1288		{{1, 3},
1289		{5, 5},
1290		{7, 7},
1291		{0, 0}
1292		}
1293	},
1294	{1, 1, 3, 0,		/* 0xaf */
1295		{{0, 3},
1296		{5, 5},
1297		{7, 7},
1298		{0, 0}
1299		}
1300	},
1301	{0, 1, 2, 0,		/* 0xb0 */
1302		{{4, 5},
1303		{7, 7},
1304		{0, 0},
1305		{0, 0}
1306		}
1307	},
1308	{1, 1, 3, 0,		/* 0xb1 */
1309		{{0, 0},
1310		{4, 5},
1311		{7, 7},
1312		{0, 0}
1313		}
1314	},
1315	{0, 1, 3, 0,		/* 0xb2 */
1316		{{1, 1},
1317		{4, 5},
1318		{7, 7},
1319		{0, 0}
1320		}
1321	},
1322	{1, 1, 3, 0,		/* 0xb3 */
1323		{{0, 1},
1324		{4, 5},
1325		{7, 7},
1326		{0, 0}
1327		}
1328	},
1329	{0, 1, 3, 0,		/* 0xb4 */
1330		{{2, 2},
1331		{4, 5},
1332		{7, 7},
1333		{0, 0}
1334		}
1335	},
1336	{1, 1, 4, 0,		/* 0xb5 */
1337		{{0, 0},
1338		{2, 2},
1339		{4, 5},
1340		{7, 7}
1341		}
1342	},
1343	{0, 1, 3, 0,		/* 0xb6 */
1344		{{1, 2},
1345		{4, 5},
1346		{7, 7},
1347		{0, 0}
1348		}
1349	},
1350	{1, 1, 3, 0,		/* 0xb7 */
1351		{{0, 2},
1352		{4, 5},
1353		{7, 7},
1354		{0, 0}
1355		}
1356	},
1357	{0, 1, 2, 0,		/* 0xb8 */
1358		{{3, 5},
1359		{7, 7},
1360		{0, 0},
1361		{0, 0}
1362		}
1363	},
1364	{1, 1, 3, 0,		/* 0xb9 */
1365		{{0, 0},
1366		{3, 5},
1367		{7, 7},
1368		{0, 0}
1369		}
1370	},
1371	{0, 1, 3, 0,		/* 0xba */
1372		{{1, 1},
1373		{3, 5},
1374		{7, 7},
1375		{0, 0}
1376		}
1377	},
1378	{1, 1, 3, 0,		/* 0xbb */
1379		{{0, 1},
1380		{3, 5},
1381		{7, 7},
1382		{0, 0}
1383		}
1384	},
1385	{0, 1, 2, 0,		/* 0xbc */
1386		{{2, 5},
1387		{7, 7},
1388		{0, 0},
1389		{0, 0}
1390		}
1391	},
1392	{1, 1, 3, 0,		/* 0xbd */
1393		{{0, 0},
1394		{2, 5},
1395		{7, 7},
1396		{0, 0}
1397		}
1398	},
1399	{0, 1, 2, 0,		/* 0xbe */
1400		{{1, 5},
1401		{7, 7},
1402		{0, 0},
1403		{0, 0}
1404		}
1405	},
1406	{1, 1, 2, 0,		/* 0xbf */
1407		{{0, 5},
1408		{7, 7},
1409		{0, 0},
1410		{0, 0}
1411		}
1412	},
1413	{0, 1, 1, 0,		/* 0xc0 */
1414		{{6, 7},
1415		{0, 0},
1416		{0, 0},
1417		{0, 0}
1418		}
1419	},
1420	{1, 1, 2, 0,		/* 0xc1 */
1421		{{0, 0},
1422		{6, 7},
1423		{0, 0},
1424		{0, 0}
1425		}
1426	},
1427	{0, 1, 2, 0,		/* 0xc2 */
1428		{{1, 1},
1429		{6, 7},
1430		{0, 0},
1431		{0, 0}
1432		}
1433	},
1434	{1, 1, 2, 0,		/* 0xc3 */
1435		{{0, 1},
1436		{6, 7},
1437		{0, 0},
1438		{0, 0}
1439		}
1440	},
1441	{0, 1, 2, 0,		/* 0xc4 */
1442		{{2, 2},
1443		{6, 7},
1444		{0, 0},
1445		{0, 0}
1446		}
1447	},
1448	{1, 1, 3, 0,		/* 0xc5 */
1449		{{0, 0},
1450		{2, 2},
1451		{6, 7},
1452		{0, 0}
1453		}
1454	},
1455	{0, 1, 2, 0,		/* 0xc6 */
1456		{{1, 2},
1457		{6, 7},
1458		{0, 0},
1459		{0, 0}
1460		}
1461	},
1462	{1, 1, 2, 0,		/* 0xc7 */
1463		{{0, 2},
1464		{6, 7},
1465		{0, 0},
1466		{0, 0}
1467		}
1468	},
1469	{0, 1, 2, 0,		/* 0xc8 */
1470		{{3, 3},
1471		{6, 7},
1472		{0, 0},
1473		{0, 0}
1474		}
1475	},
1476	{1, 1, 3, 0,		/* 0xc9 */
1477		{{0, 0},
1478		{3, 3},
1479		{6, 7},
1480		{0, 0}
1481		}
1482	},
1483	{0, 1, 3, 0,		/* 0xca */
1484		{{1, 1},
1485		{3, 3},
1486		{6, 7},
1487		{0, 0}
1488		}
1489	},
1490	{1, 1, 3, 0,		/* 0xcb */
1491		{{0, 1},
1492		{3, 3},
1493		{6, 7},
1494		{0, 0}
1495		}
1496	},
1497	{0, 1, 2, 0,		/* 0xcc */
1498		{{2, 3},
1499		{6, 7},
1500		{0, 0},
1501		{0, 0}
1502		}
1503	},
1504	{1, 1, 3, 0,		/* 0xcd */
1505		{{0, 0},
1506		{2, 3},
1507		{6, 7},
1508		{0, 0}
1509		}
1510	},
1511	{0, 1, 2, 0,		/* 0xce */
1512		{{1, 3},
1513		{6, 7},
1514		{0, 0},
1515		{0, 0}
1516		}
1517	},
1518	{1, 1, 2, 0,		/* 0xcf */
1519		{{0, 3},
1520		{6, 7},
1521		{0, 0},
1522		{0, 0}
1523		}
1524	},
1525	{0, 1, 2, 0,		/* 0xd0 */
1526		{{4, 4},
1527		{6, 7},
1528		{0, 0},
1529		{0, 0}
1530		}
1531	},
1532	{1, 1, 3, 0,		/* 0xd1 */
1533		{{0, 0},
1534		{4, 4},
1535		{6, 7},
1536		{0, 0}
1537		}
1538	},
1539	{0, 1, 3, 0,		/* 0xd2 */
1540		{{1, 1},
1541		{4, 4},
1542		{6, 7},
1543		{0, 0}
1544		}
1545	},
1546	{1, 1, 3, 0,		/* 0xd3 */
1547		{{0, 1},
1548		{4, 4},
1549		{6, 7},
1550		{0, 0}
1551		}
1552	},
1553	{0, 1, 3, 0,		/* 0xd4 */
1554		{{2, 2},
1555		{4, 4},
1556		{6, 7},
1557		{0, 0}
1558		}
1559	},
1560	{1, 1, 4, 0,		/* 0xd5 */
1561		{{0, 0},
1562		{2, 2},
1563		{4, 4},
1564		{6, 7}
1565		}
1566	},
1567	{0, 1, 3, 0,		/* 0xd6 */
1568		{{1, 2},
1569		{4, 4},
1570		{6, 7},
1571		{0, 0}
1572		}
1573	},
1574	{1, 1, 3, 0,		/* 0xd7 */
1575		{{0, 2},
1576		{4, 4},
1577		{6, 7},
1578		{0, 0}
1579		}
1580	},
1581	{0, 1, 2, 0,		/* 0xd8 */
1582		{{3, 4},
1583		{6, 7},
1584		{0, 0},
1585		{0, 0}
1586		}
1587	},
1588	{1, 1, 3, 0,		/* 0xd9 */
1589		{{0, 0},
1590		{3, 4},
1591		{6, 7},
1592		{0, 0}
1593		}
1594	},
1595	{0, 1, 3, 0,		/* 0xda */
1596		{{1, 1},
1597		{3, 4},
1598		{6, 7},
1599		{0, 0}
1600		}
1601	},
1602	{1, 1, 3, 0,		/* 0xdb */
1603		{{0, 1},
1604		{3, 4},
1605		{6, 7},
1606		{0, 0}
1607		}
1608	},
1609	{0, 1, 2, 0,		/* 0xdc */
1610		{{2, 4},
1611		{6, 7},
1612		{0, 0},
1613		{0, 0}
1614		}
1615	},
1616	{1, 1, 3, 0,		/* 0xdd */
1617		{{0, 0},
1618		{2, 4},
1619		{6, 7},
1620		{0, 0}
1621		}
1622	},
1623	{0, 1, 2, 0,		/* 0xde */
1624		{{1, 4},
1625		{6, 7},
1626		{0, 0},
1627		{0, 0}
1628		}
1629	},
1630	{1, 1, 2, 0,		/* 0xdf */
1631		{{0, 4},
1632		{6, 7},
1633		{0, 0},
1634		{0, 0}
1635		}
1636	},
1637	{0, 1, 1, 0,		/* 0xe0 */
1638		{{5, 7},
1639		{0, 0},
1640		{0, 0},
1641		{0, 0}
1642		}
1643	},
1644	{1, 1, 2, 0,		/* 0xe1 */
1645		{{0, 0},
1646		{5, 7},
1647		{0, 0},
1648		{0, 0}
1649		}
1650	},
1651	{0, 1, 2, 0,		/* 0xe2 */
1652		{{1, 1},
1653		{5, 7},
1654		{0, 0},
1655		{0, 0}
1656		}
1657	},
1658	{1, 1, 2, 0,		/* 0xe3 */
1659		{{0, 1},
1660		{5, 7},
1661		{0, 0},
1662		{0, 0}
1663		}
1664	},
1665	{0, 1, 2, 0,		/* 0xe4 */
1666		{{2, 2},
1667		{5, 7},
1668		{0, 0},
1669		{0, 0}
1670		}
1671	},
1672	{1, 1, 3, 0,		/* 0xe5 */
1673		{{0, 0},
1674		{2, 2},
1675		{5, 7},
1676		{0, 0}
1677		}
1678	},
1679	{0, 1, 2, 0,		/* 0xe6 */
1680		{{1, 2},
1681		{5, 7},
1682		{0, 0},
1683		{0, 0}
1684		}
1685	},
1686	{1, 1, 2, 0,		/* 0xe7 */
1687		{{0, 2},
1688		{5, 7},
1689		{0, 0},
1690		{0, 0}
1691		}
1692	},
1693	{0, 1, 2, 0,		/* 0xe8 */
1694		{{3, 3},
1695		{5, 7},
1696		{0, 0},
1697		{0, 0}
1698		}
1699	},
1700	{1, 1, 3, 0,		/* 0xe9 */
1701		{{0, 0},
1702		{3, 3},
1703		{5, 7},
1704		{0, 0}
1705		}
1706	},
1707	{0, 1, 3, 0,		/* 0xea */
1708		{{1, 1},
1709		{3, 3},
1710		{5, 7},
1711		{0, 0}
1712		}
1713	},
1714	{1, 1, 3, 0,		/* 0xeb */
1715		{{0, 1},
1716		{3, 3},
1717		{5, 7},
1718		{0, 0}
1719		}
1720	},
1721	{0, 1, 2, 0,		/* 0xec */
1722		{{2, 3},
1723		{5, 7},
1724		{0, 0},
1725		{0, 0}
1726		}
1727	},
1728	{1, 1, 3, 0,		/* 0xed */
1729		{{0, 0},
1730		{2, 3},
1731		{5, 7},
1732		{0, 0}
1733		}
1734	},
1735	{0, 1, 2, 0,		/* 0xee */
1736		{{1, 3},
1737		{5, 7},
1738		{0, 0},
1739		{0, 0}
1740		}
1741	},
1742	{1, 1, 2, 0,		/* 0xef */
1743		{{0, 3},
1744		{5, 7},
1745		{0, 0},
1746		{0, 0}
1747		}
1748	},
1749	{0, 1, 1, 0,		/* 0xf0 */
1750		{{4, 7},
1751		{0, 0},
1752		{0, 0},
1753		{0, 0}
1754		}
1755	},
1756	{1, 1, 2, 0,		/* 0xf1 */
1757		{{0, 0},
1758		{4, 7},
1759		{0, 0},
1760		{0, 0}
1761		}
1762	},
1763	{0, 1, 2, 0,		/* 0xf2 */
1764		{{1, 1},
1765		{4, 7},
1766		{0, 0},
1767		{0, 0}
1768		}
1769	},
1770	{1, 1, 2, 0,		/* 0xf3 */
1771		{{0, 1},
1772		{4, 7},
1773		{0, 0},
1774		{0, 0}
1775		}
1776	},
1777	{0, 1, 2, 0,		/* 0xf4 */
1778		{{2, 2},
1779		{4, 7},
1780		{0, 0},
1781		{0, 0}
1782		}
1783	},
1784	{1, 1, 3, 0,		/* 0xf5 */
1785		{{0, 0},
1786		{2, 2},
1787		{4, 7},
1788		{0, 0}
1789		}
1790	},
1791	{0, 1, 2, 0,		/* 0xf6 */
1792		{{1, 2},
1793		{4, 7},
1794		{0, 0},
1795		{0, 0}
1796		}
1797	},
1798	{1, 1, 2, 0,		/* 0xf7 */
1799		{{0, 2},
1800		{4, 7},
1801		{0, 0},
1802		{0, 0}
1803		}
1804	},
1805	{0, 1, 1, 0,		/* 0xf8 */
1806		{{3, 7},
1807		{0, 0},
1808		{0, 0},
1809		{0, 0}
1810		}
1811	},
1812	{1, 1, 2, 0,		/* 0xf9 */
1813		{{0, 0},
1814		{3, 7},
1815		{0, 0},
1816		{0, 0}
1817		}
1818	},
1819	{0, 1, 2, 0,		/* 0xfa */
1820		{{1, 1},
1821		{3, 7},
1822		{0, 0},
1823		{0, 0}
1824		}
1825	},
1826	{1, 1, 2, 0,		/* 0xfb */
1827		{{0, 1},
1828		{3, 7},
1829		{0, 0},
1830		{0, 0}
1831		}
1832	},
1833	{0, 1, 1, 0,		/* 0xfc */
1834		{{2, 7},
1835		{0, 0},
1836		{0, 0},
1837		{0, 0}
1838		}
1839	},
1840	{1, 1, 2, 0,		/* 0xfd */
1841		{{0, 0},
1842		{2, 7},
1843		{0, 0},
1844		{0, 0}
1845		}
1846	},
1847	{0, 1, 1, 0,		/* 0xfe */
1848		{{1, 7},
1849		{0, 0},
1850		{0, 0},
1851		{0, 0}
1852		}
1853	},
1854	{1, 1, 1, 0,		/* 0xff */
1855		{{0, 7},
1856		{0, 0},
1857		{0, 0},
1858		{0, 0}
1859		}
1860	}
1861};
1862
1863
1864int
1865sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866    struct sctp_scoping *scope,
1867    int do_update)
1868{
1869	if ((scope->loopback_scope == 0) &&
1870	    (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1871		/*
1872		 * skip loopback if not in scope *
1873		 */
1874		return (0);
1875	}
1876	switch (ifa->address.sa.sa_family) {
1877#ifdef INET
1878	case AF_INET:
1879		if (scope->ipv4_addr_legal) {
1880			struct sockaddr_in *sin;
1881
1882			sin = (struct sockaddr_in *)&ifa->address.sin;
1883			if (sin->sin_addr.s_addr == 0) {
1884				/* not in scope , unspecified */
1885				return (0);
1886			}
1887			if ((scope->ipv4_local_scope == 0) &&
1888			    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1889				/* private address not in scope */
1890				return (0);
1891			}
1892		} else {
1893			return (0);
1894		}
1895		break;
1896#endif
1897#ifdef INET6
1898	case AF_INET6:
1899		if (scope->ipv6_addr_legal) {
1900			struct sockaddr_in6 *sin6;
1901
1902			/*
1903			 * Must update the flags,  bummer, which means any
1904			 * IFA locks must now be applied HERE <->
1905			 */
1906			if (do_update) {
1907				sctp_gather_internal_ifa_flags(ifa);
1908			}
1909			if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1910				return (0);
1911			}
1912			/* ok to use deprecated addresses? */
1913			sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1914			if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1915				/* skip unspecifed addresses */
1916				return (0);
1917			}
1918			if (	/* (local_scope == 0) && */
1919			    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1920				return (0);
1921			}
1922			if ((scope->site_scope == 0) &&
1923			    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1924				return (0);
1925			}
1926		} else {
1927			return (0);
1928		}
1929		break;
1930#endif
1931	default:
1932		return (0);
1933	}
1934	return (1);
1935}
1936
1937static struct mbuf *
1938sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1939{
1940#if defined(INET) || defined(INET6)
1941	struct sctp_paramhdr *parmh;
1942	struct mbuf *mret;
1943	uint16_t plen;
1944
1945#endif
1946
1947	switch (ifa->address.sa.sa_family) {
1948#ifdef INET
1949	case AF_INET:
1950		plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1951		break;
1952#endif
1953#ifdef INET6
1954	case AF_INET6:
1955		plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1956		break;
1957#endif
1958	default:
1959		return (m);
1960	}
1961#if defined(INET) || defined(INET6)
1962	if (M_TRAILINGSPACE(m) >= plen) {
1963		/* easy side we just drop it on the end */
1964		parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1965		mret = m;
1966	} else {
1967		/* Need more space */
1968		mret = m;
1969		while (SCTP_BUF_NEXT(mret) != NULL) {
1970			mret = SCTP_BUF_NEXT(mret);
1971		}
1972		SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1973		if (SCTP_BUF_NEXT(mret) == NULL) {
1974			/* We are hosed, can't add more addresses */
1975			return (m);
1976		}
1977		mret = SCTP_BUF_NEXT(mret);
1978		parmh = mtod(mret, struct sctp_paramhdr *);
1979	}
1980	/* now add the parameter */
1981	switch (ifa->address.sa.sa_family) {
1982#ifdef INET
1983	case AF_INET:
1984		{
1985			struct sctp_ipv4addr_param *ipv4p;
1986			struct sockaddr_in *sin;
1987
1988			sin = (struct sockaddr_in *)&ifa->address.sin;
1989			ipv4p = (struct sctp_ipv4addr_param *)parmh;
1990			parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1991			parmh->param_length = htons(plen);
1992			ipv4p->addr = sin->sin_addr.s_addr;
1993			SCTP_BUF_LEN(mret) += plen;
1994			break;
1995		}
1996#endif
1997#ifdef INET6
1998	case AF_INET6:
1999		{
2000			struct sctp_ipv6addr_param *ipv6p;
2001			struct sockaddr_in6 *sin6;
2002
2003			sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2004			ipv6p = (struct sctp_ipv6addr_param *)parmh;
2005			parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2006			parmh->param_length = htons(plen);
2007			memcpy(ipv6p->addr, &sin6->sin6_addr,
2008			    sizeof(ipv6p->addr));
2009			/* clear embedded scope in the address */
2010			in6_clearscope((struct in6_addr *)ipv6p->addr);
2011			SCTP_BUF_LEN(mret) += plen;
2012			break;
2013		}
2014#endif
2015	default:
2016		return (m);
2017	}
2018	if (len != NULL) {
2019		*len += plen;
2020	}
2021	return (mret);
2022#endif
2023}
2024
2025
2026struct mbuf *
2027sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2028    struct sctp_scoping *scope,
2029    struct mbuf *m_at, int cnt_inits_to,
2030    uint16_t * padding_len, uint16_t * chunk_len)
2031{
2032	struct sctp_vrf *vrf = NULL;
2033	int cnt, limit_out = 0, total_count;
2034	uint32_t vrf_id;
2035
2036	vrf_id = inp->def_vrf_id;
2037	SCTP_IPI_ADDR_RLOCK();
2038	vrf = sctp_find_vrf(vrf_id);
2039	if (vrf == NULL) {
2040		SCTP_IPI_ADDR_RUNLOCK();
2041		return (m_at);
2042	}
2043	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2044		struct sctp_ifa *sctp_ifap;
2045		struct sctp_ifn *sctp_ifnp;
2046
2047		cnt = cnt_inits_to;
2048		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2049			limit_out = 1;
2050			cnt = SCTP_ADDRESS_LIMIT;
2051			goto skip_count;
2052		}
2053		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2054			if ((scope->loopback_scope == 0) &&
2055			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2056				/*
2057				 * Skip loopback devices if loopback_scope
2058				 * not set
2059				 */
2060				continue;
2061			}
2062			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2063				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2064					continue;
2065				}
2066				if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2067					continue;
2068				}
2069				cnt++;
2070				if (cnt > SCTP_ADDRESS_LIMIT) {
2071					break;
2072				}
2073			}
2074			if (cnt > SCTP_ADDRESS_LIMIT) {
2075				break;
2076			}
2077		}
2078skip_count:
2079		if (cnt > 1) {
2080			total_count = 0;
2081			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2082				cnt = 0;
2083				if ((scope->loopback_scope == 0) &&
2084				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2085					/*
2086					 * Skip loopback devices if
2087					 * loopback_scope not set
2088					 */
2089					continue;
2090				}
2091				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2092					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2093						continue;
2094					}
2095					if (sctp_is_address_in_scope(sctp_ifap,
2096					    scope, 0) == 0) {
2097						continue;
2098					}
2099					if ((chunk_len != NULL) &&
2100					    (padding_len != NULL) &&
2101					    (*padding_len > 0)) {
2102						memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2103						SCTP_BUF_LEN(m_at) += *padding_len;
2104						*chunk_len += *padding_len;
2105						*padding_len = 0;
2106					}
2107					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2108					if (limit_out) {
2109						cnt++;
2110						total_count++;
2111						if (cnt >= 2) {
2112							/*
2113							 * two from each
2114							 * address
2115							 */
2116							break;
2117						}
2118						if (total_count > SCTP_ADDRESS_LIMIT) {
2119							/* No more addresses */
2120							break;
2121						}
2122					}
2123				}
2124			}
2125		}
2126	} else {
2127		struct sctp_laddr *laddr;
2128
2129		cnt = cnt_inits_to;
2130		/* First, how many ? */
2131		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2132			if (laddr->ifa == NULL) {
2133				continue;
2134			}
2135			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2136				/*
2137				 * Address being deleted by the system, dont
2138				 * list.
2139				 */
2140				continue;
2141			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2142				/*
2143				 * Address being deleted on this ep don't
2144				 * list.
2145				 */
2146				continue;
2147			}
2148			if (sctp_is_address_in_scope(laddr->ifa,
2149			    scope, 1) == 0) {
2150				continue;
2151			}
2152			cnt++;
2153		}
2154		/*
2155		 * To get through a NAT we only list addresses if we have
2156		 * more than one. That way if you just bind a single address
2157		 * we let the source of the init dictate our address.
2158		 */
2159		if (cnt > 1) {
2160			cnt = cnt_inits_to;
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					continue;
2167				}
2168				if (sctp_is_address_in_scope(laddr->ifa,
2169				    scope, 0) == 0) {
2170					continue;
2171				}
2172				if ((chunk_len != NULL) &&
2173				    (padding_len != NULL) &&
2174				    (*padding_len > 0)) {
2175					memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2176					SCTP_BUF_LEN(m_at) += *padding_len;
2177					*chunk_len += *padding_len;
2178					*padding_len = 0;
2179				}
2180				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2181				cnt++;
2182				if (cnt >= SCTP_ADDRESS_LIMIT) {
2183					break;
2184				}
2185			}
2186		}
2187	}
2188	SCTP_IPI_ADDR_RUNLOCK();
2189	return (m_at);
2190}
2191
2192static struct sctp_ifa *
2193sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2194    uint8_t dest_is_loop,
2195    uint8_t dest_is_priv,
2196    sa_family_t fam)
2197{
2198	uint8_t dest_is_global = 0;
2199
2200	/* dest_is_priv is true if destination is a private address */
2201	/* dest_is_loop is true if destination is a loopback addresses */
2202
2203	/**
2204	 * Here we determine if its a preferred address. A preferred address
2205	 * means it is the same scope or higher scope then the destination.
2206	 * L = loopback, P = private, G = global
2207	 * -----------------------------------------
2208	 *    src    |  dest | result
2209	 *  ----------------------------------------
2210	 *     L     |    L  |    yes
2211	 *  -----------------------------------------
2212	 *     P     |    L  |    yes-v4 no-v6
2213	 *  -----------------------------------------
2214	 *     G     |    L  |    yes-v4 no-v6
2215	 *  -----------------------------------------
2216	 *     L     |    P  |    no
2217	 *  -----------------------------------------
2218	 *     P     |    P  |    yes
2219	 *  -----------------------------------------
2220	 *     G     |    P  |    no
2221	 *   -----------------------------------------
2222	 *     L     |    G  |    no
2223	 *   -----------------------------------------
2224	 *     P     |    G  |    no
2225	 *    -----------------------------------------
2226	 *     G     |    G  |    yes
2227	 *    -----------------------------------------
2228	 */
2229
2230	if (ifa->address.sa.sa_family != fam) {
2231		/* forget mis-matched family */
2232		return (NULL);
2233	}
2234	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2235		dest_is_global = 1;
2236	}
2237	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2238	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2239	/* Ok the address may be ok */
2240#ifdef INET6
2241	if (fam == AF_INET6) {
2242		/* ok to use deprecated addresses? no lets not! */
2243		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2244			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2245			return (NULL);
2246		}
2247		if (ifa->src_is_priv && !ifa->src_is_loop) {
2248			if (dest_is_loop) {
2249				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2250				return (NULL);
2251			}
2252		}
2253		if (ifa->src_is_glob) {
2254			if (dest_is_loop) {
2255				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2256				return (NULL);
2257			}
2258		}
2259	}
2260#endif
2261	/*
2262	 * Now that we know what is what, implement or table this could in
2263	 * theory be done slicker (it used to be), but this is
2264	 * straightforward and easier to validate :-)
2265	 */
2266	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2267	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2268	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2269	    dest_is_loop, dest_is_priv, dest_is_global);
2270
2271	if ((ifa->src_is_loop) && (dest_is_priv)) {
2272		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2273		return (NULL);
2274	}
2275	if ((ifa->src_is_glob) && (dest_is_priv)) {
2276		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2277		return (NULL);
2278	}
2279	if ((ifa->src_is_loop) && (dest_is_global)) {
2280		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2281		return (NULL);
2282	}
2283	if ((ifa->src_is_priv) && (dest_is_global)) {
2284		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2285		return (NULL);
2286	}
2287	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2288	/* its a preferred address */
2289	return (ifa);
2290}
2291
2292static struct sctp_ifa *
2293sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2294    uint8_t dest_is_loop,
2295    uint8_t dest_is_priv,
2296    sa_family_t fam)
2297{
2298	uint8_t dest_is_global = 0;
2299
2300	/**
2301	 * Here we determine if its a acceptable address. A acceptable
2302	 * address means it is the same scope or higher scope but we can
2303	 * allow for NAT which means its ok to have a global dest and a
2304	 * private src.
2305	 *
2306	 * L = loopback, P = private, G = global
2307	 * -----------------------------------------
2308	 *  src    |  dest | result
2309	 * -----------------------------------------
2310	 *   L     |   L   |    yes
2311	 *  -----------------------------------------
2312	 *   P     |   L   |    yes-v4 no-v6
2313	 *  -----------------------------------------
2314	 *   G     |   L   |    yes
2315	 * -----------------------------------------
2316	 *   L     |   P   |    no
2317	 * -----------------------------------------
2318	 *   P     |   P   |    yes
2319	 * -----------------------------------------
2320	 *   G     |   P   |    yes - May not work
2321	 * -----------------------------------------
2322	 *   L     |   G   |    no
2323	 * -----------------------------------------
2324	 *   P     |   G   |    yes - May not work
2325	 * -----------------------------------------
2326	 *   G     |   G   |    yes
2327	 * -----------------------------------------
2328	 */
2329
2330	if (ifa->address.sa.sa_family != fam) {
2331		/* forget non matching family */
2332		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2333		    ifa->address.sa.sa_family, fam);
2334		return (NULL);
2335	}
2336	/* Ok the address may be ok */
2337	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2338	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2339	    dest_is_loop, dest_is_priv);
2340	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2341		dest_is_global = 1;
2342	}
2343#ifdef INET6
2344	if (fam == AF_INET6) {
2345		/* ok to use deprecated addresses? */
2346		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2347			return (NULL);
2348		}
2349		if (ifa->src_is_priv) {
2350			/* Special case, linklocal to loop */
2351			if (dest_is_loop)
2352				return (NULL);
2353		}
2354	}
2355#endif
2356	/*
2357	 * Now that we know what is what, implement our table. This could in
2358	 * theory be done slicker (it used to be), but this is
2359	 * straightforward and easier to validate :-)
2360	 */
2361	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2362	    ifa->src_is_loop,
2363	    dest_is_priv);
2364	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2365		return (NULL);
2366	}
2367	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2368	    ifa->src_is_loop,
2369	    dest_is_global);
2370	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2371		return (NULL);
2372	}
2373	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2374	/* its an acceptable address */
2375	return (ifa);
2376}
2377
2378int
2379sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2380{
2381	struct sctp_laddr *laddr;
2382
2383	if (stcb == NULL) {
2384		/* There are no restrictions, no TCB :-) */
2385		return (0);
2386	}
2387	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2388		if (laddr->ifa == NULL) {
2389			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2390			    __FUNCTION__);
2391			continue;
2392		}
2393		if (laddr->ifa == ifa) {
2394			/* Yes it is on the list */
2395			return (1);
2396		}
2397	}
2398	return (0);
2399}
2400
2401
2402int
2403sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2404{
2405	struct sctp_laddr *laddr;
2406
2407	if (ifa == NULL)
2408		return (0);
2409	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2410		if (laddr->ifa == NULL) {
2411			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2412			    __FUNCTION__);
2413			continue;
2414		}
2415		if ((laddr->ifa == ifa) && laddr->action == 0)
2416			/* same pointer */
2417			return (1);
2418	}
2419	return (0);
2420}
2421
2422
2423
2424static struct sctp_ifa *
2425sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2426    sctp_route_t * ro,
2427    uint32_t vrf_id,
2428    int non_asoc_addr_ok,
2429    uint8_t dest_is_priv,
2430    uint8_t dest_is_loop,
2431    sa_family_t fam)
2432{
2433	struct sctp_laddr *laddr, *starting_point;
2434	void *ifn;
2435	int resettotop = 0;
2436	struct sctp_ifn *sctp_ifn;
2437	struct sctp_ifa *sctp_ifa, *sifa;
2438	struct sctp_vrf *vrf;
2439	uint32_t ifn_index;
2440
2441	vrf = sctp_find_vrf(vrf_id);
2442	if (vrf == NULL)
2443		return (NULL);
2444
2445	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2446	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2447	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2448	/*
2449	 * first question, is the ifn we will emit on in our list, if so, we
2450	 * want such an address. Note that we first looked for a preferred
2451	 * address.
2452	 */
2453	if (sctp_ifn) {
2454		/* is a preferred one on the interface we route out? */
2455		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2456			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2457			    (non_asoc_addr_ok == 0))
2458				continue;
2459			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2460			    dest_is_loop,
2461			    dest_is_priv, fam);
2462			if (sifa == NULL)
2463				continue;
2464			if (sctp_is_addr_in_ep(inp, sifa)) {
2465				atomic_add_int(&sifa->refcount, 1);
2466				return (sifa);
2467			}
2468		}
2469	}
2470	/*
2471	 * ok, now we now need to find one on the list of the addresses. We
2472	 * can't get one on the emitting interface so let's find first a
2473	 * preferred one. If not that an acceptable one otherwise... we
2474	 * return NULL.
2475	 */
2476	starting_point = inp->next_addr_touse;
2477once_again:
2478	if (inp->next_addr_touse == NULL) {
2479		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2480		resettotop = 1;
2481	}
2482	for (laddr = inp->next_addr_touse; laddr;
2483	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2484		if (laddr->ifa == NULL) {
2485			/* address has been removed */
2486			continue;
2487		}
2488		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2489			/* address is being deleted */
2490			continue;
2491		}
2492		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2493		    dest_is_priv, fam);
2494		if (sifa == NULL)
2495			continue;
2496		atomic_add_int(&sifa->refcount, 1);
2497		return (sifa);
2498	}
2499	if (resettotop == 0) {
2500		inp->next_addr_touse = NULL;
2501		goto once_again;
2502	}
2503	inp->next_addr_touse = starting_point;
2504	resettotop = 0;
2505once_again_too:
2506	if (inp->next_addr_touse == NULL) {
2507		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2508		resettotop = 1;
2509	}
2510	/* ok, what about an acceptable address in the inp */
2511	for (laddr = inp->next_addr_touse; laddr;
2512	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2513		if (laddr->ifa == NULL) {
2514			/* address has been removed */
2515			continue;
2516		}
2517		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2518			/* address is being deleted */
2519			continue;
2520		}
2521		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2522		    dest_is_priv, fam);
2523		if (sifa == NULL)
2524			continue;
2525		atomic_add_int(&sifa->refcount, 1);
2526		return (sifa);
2527	}
2528	if (resettotop == 0) {
2529		inp->next_addr_touse = NULL;
2530		goto once_again_too;
2531	}
2532	/*
2533	 * no address bound can be a source for the destination we are in
2534	 * trouble
2535	 */
2536	return (NULL);
2537}
2538
2539
2540
2541static struct sctp_ifa *
2542sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2543    struct sctp_tcb *stcb,
2544    sctp_route_t * ro,
2545    uint32_t vrf_id,
2546    uint8_t dest_is_priv,
2547    uint8_t dest_is_loop,
2548    int non_asoc_addr_ok,
2549    sa_family_t fam)
2550{
2551	struct sctp_laddr *laddr, *starting_point;
2552	void *ifn;
2553	struct sctp_ifn *sctp_ifn;
2554	struct sctp_ifa *sctp_ifa, *sifa;
2555	uint8_t start_at_beginning = 0;
2556	struct sctp_vrf *vrf;
2557	uint32_t ifn_index;
2558
2559	/*
2560	 * first question, is the ifn we will emit on in our list, if so, we
2561	 * want that one.
2562	 */
2563	vrf = sctp_find_vrf(vrf_id);
2564	if (vrf == NULL)
2565		return (NULL);
2566
2567	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2568	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2569	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2570
2571	/*
2572	 * first question, is the ifn we will emit on in our list?  If so,
2573	 * we want that one. First we look for a preferred. Second, we go
2574	 * for an acceptable.
2575	 */
2576	if (sctp_ifn) {
2577		/* first try for a preferred address on the ep */
2578		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2579			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2580				continue;
2581			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2582				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2583				if (sifa == NULL)
2584					continue;
2585				if (((non_asoc_addr_ok == 0) &&
2586				    (sctp_is_addr_restricted(stcb, sifa))) ||
2587				    (non_asoc_addr_ok &&
2588				    (sctp_is_addr_restricted(stcb, sifa)) &&
2589				    (!sctp_is_addr_pending(stcb, sifa)))) {
2590					/* on the no-no list */
2591					continue;
2592				}
2593				atomic_add_int(&sifa->refcount, 1);
2594				return (sifa);
2595			}
2596		}
2597		/* next try for an acceptable address on the ep */
2598		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2599			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2600				continue;
2601			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2602				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2603				if (sifa == NULL)
2604					continue;
2605				if (((non_asoc_addr_ok == 0) &&
2606				    (sctp_is_addr_restricted(stcb, sifa))) ||
2607				    (non_asoc_addr_ok &&
2608				    (sctp_is_addr_restricted(stcb, sifa)) &&
2609				    (!sctp_is_addr_pending(stcb, sifa)))) {
2610					/* on the no-no list */
2611					continue;
2612				}
2613				atomic_add_int(&sifa->refcount, 1);
2614				return (sifa);
2615			}
2616		}
2617
2618	}
2619	/*
2620	 * if we can't find one like that then we must look at all addresses
2621	 * bound to pick one at first preferable then secondly acceptable.
2622	 */
2623	starting_point = stcb->asoc.last_used_address;
2624sctp_from_the_top:
2625	if (stcb->asoc.last_used_address == NULL) {
2626		start_at_beginning = 1;
2627		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2628	}
2629	/* search beginning with the last used address */
2630	for (laddr = stcb->asoc.last_used_address; laddr;
2631	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2632		if (laddr->ifa == NULL) {
2633			/* address has been removed */
2634			continue;
2635		}
2636		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2637			/* address is being deleted */
2638			continue;
2639		}
2640		sifa = sctp_is_ifa_addr_preferred(laddr->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		stcb->asoc.last_used_address = laddr;
2652		atomic_add_int(&sifa->refcount, 1);
2653		return (sifa);
2654	}
2655	if (start_at_beginning == 0) {
2656		stcb->asoc.last_used_address = NULL;
2657		goto sctp_from_the_top;
2658	}
2659	/* now try for any higher scope than the destination */
2660	stcb->asoc.last_used_address = starting_point;
2661	start_at_beginning = 0;
2662sctp_from_the_top2:
2663	if (stcb->asoc.last_used_address == NULL) {
2664		start_at_beginning = 1;
2665		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2666	}
2667	/* search beginning with the last used address */
2668	for (laddr = stcb->asoc.last_used_address; laddr;
2669	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2670		if (laddr->ifa == NULL) {
2671			/* address has been removed */
2672			continue;
2673		}
2674		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2675			/* address is being deleted */
2676			continue;
2677		}
2678		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2679		    dest_is_priv, fam);
2680		if (sifa == NULL)
2681			continue;
2682		if (((non_asoc_addr_ok == 0) &&
2683		    (sctp_is_addr_restricted(stcb, sifa))) ||
2684		    (non_asoc_addr_ok &&
2685		    (sctp_is_addr_restricted(stcb, sifa)) &&
2686		    (!sctp_is_addr_pending(stcb, sifa)))) {
2687			/* on the no-no list */
2688			continue;
2689		}
2690		stcb->asoc.last_used_address = laddr;
2691		atomic_add_int(&sifa->refcount, 1);
2692		return (sifa);
2693	}
2694	if (start_at_beginning == 0) {
2695		stcb->asoc.last_used_address = NULL;
2696		goto sctp_from_the_top2;
2697	}
2698	return (NULL);
2699}
2700
2701static struct sctp_ifa *
2702sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2703    struct sctp_tcb *stcb,
2704    int non_asoc_addr_ok,
2705    uint8_t dest_is_loop,
2706    uint8_t dest_is_priv,
2707    int addr_wanted,
2708    sa_family_t fam,
2709    sctp_route_t * ro
2710)
2711{
2712	struct sctp_ifa *ifa, *sifa;
2713	int num_eligible_addr = 0;
2714
2715#ifdef INET6
2716	struct sockaddr_in6 sin6, lsa6;
2717
2718	if (fam == AF_INET6) {
2719		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2720		(void)sa6_recoverscope(&sin6);
2721	}
2722#endif				/* INET6 */
2723	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2724		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2725		    (non_asoc_addr_ok == 0))
2726			continue;
2727		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2728		    dest_is_priv, fam);
2729		if (sifa == NULL)
2730			continue;
2731#ifdef INET6
2732		if (fam == AF_INET6 &&
2733		    dest_is_loop &&
2734		    sifa->src_is_loop && sifa->src_is_priv) {
2735			/*
2736			 * don't allow fe80::1 to be a src on loop ::1, we
2737			 * don't list it to the peer so we will get an
2738			 * abort.
2739			 */
2740			continue;
2741		}
2742		if (fam == AF_INET6 &&
2743		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2744		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2745			/*
2746			 * link-local <-> link-local must belong to the same
2747			 * scope.
2748			 */
2749			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2750			(void)sa6_recoverscope(&lsa6);
2751			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2752				continue;
2753			}
2754		}
2755#endif				/* INET6 */
2756
2757		/*
2758		 * Check if the IPv6 address matches to next-hop. In the
2759		 * mobile case, old IPv6 address may be not deleted from the
2760		 * interface. Then, the interface has previous and new
2761		 * addresses.  We should use one corresponding to the
2762		 * next-hop.  (by micchie)
2763		 */
2764#ifdef INET6
2765		if (stcb && fam == AF_INET6 &&
2766		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2767			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2768			    == 0) {
2769				continue;
2770			}
2771		}
2772#endif
2773#ifdef INET
2774		/* Avoid topologically incorrect IPv4 address */
2775		if (stcb && fam == AF_INET &&
2776		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2777			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2778				continue;
2779			}
2780		}
2781#endif
2782		if (stcb) {
2783			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2784				continue;
2785			}
2786			if (((non_asoc_addr_ok == 0) &&
2787			    (sctp_is_addr_restricted(stcb, sifa))) ||
2788			    (non_asoc_addr_ok &&
2789			    (sctp_is_addr_restricted(stcb, sifa)) &&
2790			    (!sctp_is_addr_pending(stcb, sifa)))) {
2791				/*
2792				 * It is restricted for some reason..
2793				 * probably not yet added.
2794				 */
2795				continue;
2796			}
2797		}
2798		if (num_eligible_addr >= addr_wanted) {
2799			return (sifa);
2800		}
2801		num_eligible_addr++;
2802	}
2803	return (NULL);
2804}
2805
2806
2807static int
2808sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2809    struct sctp_tcb *stcb,
2810    int non_asoc_addr_ok,
2811    uint8_t dest_is_loop,
2812    uint8_t dest_is_priv,
2813    sa_family_t fam)
2814{
2815	struct sctp_ifa *ifa, *sifa;
2816	int num_eligible_addr = 0;
2817
2818	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2819		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2820		    (non_asoc_addr_ok == 0)) {
2821			continue;
2822		}
2823		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2824		    dest_is_priv, fam);
2825		if (sifa == NULL) {
2826			continue;
2827		}
2828		if (stcb) {
2829			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2830				continue;
2831			}
2832			if (((non_asoc_addr_ok == 0) &&
2833			    (sctp_is_addr_restricted(stcb, sifa))) ||
2834			    (non_asoc_addr_ok &&
2835			    (sctp_is_addr_restricted(stcb, sifa)) &&
2836			    (!sctp_is_addr_pending(stcb, sifa)))) {
2837				/*
2838				 * It is restricted for some reason..
2839				 * probably not yet added.
2840				 */
2841				continue;
2842			}
2843		}
2844		num_eligible_addr++;
2845	}
2846	return (num_eligible_addr);
2847}
2848
2849static struct sctp_ifa *
2850sctp_choose_boundall(struct sctp_tcb *stcb,
2851    struct sctp_nets *net,
2852    sctp_route_t * ro,
2853    uint32_t vrf_id,
2854    uint8_t dest_is_priv,
2855    uint8_t dest_is_loop,
2856    int non_asoc_addr_ok,
2857    sa_family_t fam)
2858{
2859	int cur_addr_num = 0, num_preferred = 0;
2860	void *ifn;
2861	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2862	struct sctp_ifa *sctp_ifa, *sifa;
2863	uint32_t ifn_index;
2864	struct sctp_vrf *vrf;
2865
2866#ifdef INET
2867	int retried = 0;
2868
2869#endif
2870
2871	/*-
2872	 * For boundall we can use any address in the association.
2873	 * If non_asoc_addr_ok is set we can use any address (at least in
2874	 * theory). So we look for preferred addresses first. If we find one,
2875	 * we use it. Otherwise we next try to get an address on the
2876	 * interface, which we should be able to do (unless non_asoc_addr_ok
2877	 * is false and we are routed out that way). In these cases where we
2878	 * can't use the address of the interface we go through all the
2879	 * ifn's looking for an address we can use and fill that in. Punting
2880	 * means we send back address 0, which will probably cause problems
2881	 * actually since then IP will fill in the address of the route ifn,
2882	 * which means we probably already rejected it.. i.e. here comes an
2883	 * abort :-<.
2884	 */
2885	vrf = sctp_find_vrf(vrf_id);
2886	if (vrf == NULL)
2887		return (NULL);
2888
2889	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2890	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2891	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2892	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2893	if (sctp_ifn == NULL) {
2894		/* ?? We don't have this guy ?? */
2895		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2896		goto bound_all_plan_b;
2897	}
2898	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2899	    ifn_index, sctp_ifn->ifn_name);
2900
2901	if (net) {
2902		cur_addr_num = net->indx_of_eligible_next_to_use;
2903	}
2904	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2905	    stcb,
2906	    non_asoc_addr_ok,
2907	    dest_is_loop,
2908	    dest_is_priv, fam);
2909	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2910	    num_preferred, sctp_ifn->ifn_name);
2911	if (num_preferred == 0) {
2912		/*
2913		 * no eligible addresses, we must use some other interface
2914		 * address if we can find one.
2915		 */
2916		goto bound_all_plan_b;
2917	}
2918	/*
2919	 * Ok we have num_eligible_addr set with how many we can use, this
2920	 * may vary from call to call due to addresses being deprecated
2921	 * etc..
2922	 */
2923	if (cur_addr_num >= num_preferred) {
2924		cur_addr_num = 0;
2925	}
2926	/*
2927	 * select the nth address from the list (where cur_addr_num is the
2928	 * nth) and 0 is the first one, 1 is the second one etc...
2929	 */
2930	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2931
2932	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2933	    dest_is_priv, cur_addr_num, fam, ro);
2934
2935	/* if sctp_ifa is NULL something changed??, fall to plan b. */
2936	if (sctp_ifa) {
2937		atomic_add_int(&sctp_ifa->refcount, 1);
2938		if (net) {
2939			/* save off where the next one we will want */
2940			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2941		}
2942		return (sctp_ifa);
2943	}
2944	/*
2945	 * plan_b: Look at all interfaces and find a preferred address. If
2946	 * no preferred fall through to plan_c.
2947	 */
2948bound_all_plan_b:
2949	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2950	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2951		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2952		    sctp_ifn->ifn_name);
2953		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2954			/* wrong base scope */
2955			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2956			continue;
2957		}
2958		if ((sctp_ifn == looked_at) && looked_at) {
2959			/* already looked at this guy */
2960			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2961			continue;
2962		}
2963		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2964		    dest_is_loop, dest_is_priv, fam);
2965		SCTPDBG(SCTP_DEBUG_OUTPUT2,
2966		    "Found ifn:%p %d preferred source addresses\n",
2967		    ifn, num_preferred);
2968		if (num_preferred == 0) {
2969			/* None on this interface. */
2970			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2971			continue;
2972		}
2973		SCTPDBG(SCTP_DEBUG_OUTPUT2,
2974		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
2975		    num_preferred, (void *)sctp_ifn, cur_addr_num);
2976
2977		/*
2978		 * Ok we have num_eligible_addr set with how many we can
2979		 * use, this may vary from call to call due to addresses
2980		 * being deprecated etc..
2981		 */
2982		if (cur_addr_num >= num_preferred) {
2983			cur_addr_num = 0;
2984		}
2985		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2986		    dest_is_priv, cur_addr_num, fam, ro);
2987		if (sifa == NULL)
2988			continue;
2989		if (net) {
2990			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2991			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2992			    cur_addr_num);
2993			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2994			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2995			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2996			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2997		}
2998		atomic_add_int(&sifa->refcount, 1);
2999		return (sifa);
3000	}
3001#ifdef INET
3002again_with_private_addresses_allowed:
3003#endif
3004	/* plan_c: do we have an acceptable address on the emit interface */
3005	sifa = NULL;
3006	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3007	if (emit_ifn == NULL) {
3008		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3009		goto plan_d;
3010	}
3011	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3012		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3013		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3014		    (non_asoc_addr_ok == 0)) {
3015			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3016			continue;
3017		}
3018		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3019		    dest_is_priv, fam);
3020		if (sifa == NULL) {
3021			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3022			continue;
3023		}
3024		if (stcb) {
3025			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3026				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3027				sifa = NULL;
3028				continue;
3029			}
3030			if (((non_asoc_addr_ok == 0) &&
3031			    (sctp_is_addr_restricted(stcb, sifa))) ||
3032			    (non_asoc_addr_ok &&
3033			    (sctp_is_addr_restricted(stcb, sifa)) &&
3034			    (!sctp_is_addr_pending(stcb, sifa)))) {
3035				/*
3036				 * It is restricted for some reason..
3037				 * probably not yet added.
3038				 */
3039				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3040				sifa = NULL;
3041				continue;
3042			}
3043		} else {
3044			SCTP_PRINTF("Stcb is null - no print\n");
3045		}
3046		atomic_add_int(&sifa->refcount, 1);
3047		goto out;
3048	}
3049plan_d:
3050	/*
3051	 * plan_d: We are in trouble. No preferred address on the emit
3052	 * interface. And not even a preferred address on all interfaces. Go
3053	 * out and see if we can find an acceptable address somewhere
3054	 * amongst all interfaces.
3055	 */
3056	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3057	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3058		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3059			/* wrong base scope */
3060			continue;
3061		}
3062		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3063			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3064			    (non_asoc_addr_ok == 0))
3065				continue;
3066			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3067			    dest_is_loop,
3068			    dest_is_priv, fam);
3069			if (sifa == NULL)
3070				continue;
3071			if (stcb) {
3072				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3073					sifa = NULL;
3074					continue;
3075				}
3076				if (((non_asoc_addr_ok == 0) &&
3077				    (sctp_is_addr_restricted(stcb, sifa))) ||
3078				    (non_asoc_addr_ok &&
3079				    (sctp_is_addr_restricted(stcb, sifa)) &&
3080				    (!sctp_is_addr_pending(stcb, sifa)))) {
3081					/*
3082					 * It is restricted for some
3083					 * reason.. probably not yet added.
3084					 */
3085					sifa = NULL;
3086					continue;
3087				}
3088			}
3089			goto out;
3090		}
3091	}
3092#ifdef INET
3093	if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3094		stcb->asoc.scope.ipv4_local_scope = 1;
3095		retried = 1;
3096		goto again_with_private_addresses_allowed;
3097	} else if (retried == 1) {
3098		stcb->asoc.scope.ipv4_local_scope = 0;
3099	}
3100#endif
3101out:
3102#ifdef INET
3103	if (sifa) {
3104		if (retried == 1) {
3105			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3106				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3107					/* wrong base scope */
3108					continue;
3109				}
3110				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3111					struct sctp_ifa *tmp_sifa;
3112
3113					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3114					    (non_asoc_addr_ok == 0))
3115						continue;
3116					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3117					    dest_is_loop,
3118					    dest_is_priv, fam);
3119					if (tmp_sifa == NULL) {
3120						continue;
3121					}
3122					if (tmp_sifa == sifa) {
3123						continue;
3124					}
3125					if (stcb) {
3126						if (sctp_is_address_in_scope(tmp_sifa,
3127						    &stcb->asoc.scope, 0) == 0) {
3128							continue;
3129						}
3130						if (((non_asoc_addr_ok == 0) &&
3131						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3132						    (non_asoc_addr_ok &&
3133						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3134						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3135							/*
3136							 * It is restricted
3137							 * for some reason..
3138							 * probably not yet
3139							 * added.
3140							 */
3141							continue;
3142						}
3143					}
3144					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3145					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3146						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3147					}
3148				}
3149			}
3150		}
3151		atomic_add_int(&sifa->refcount, 1);
3152	}
3153#endif
3154	return (sifa);
3155}
3156
3157
3158
3159/* tcb may be NULL */
3160struct sctp_ifa *
3161sctp_source_address_selection(struct sctp_inpcb *inp,
3162    struct sctp_tcb *stcb,
3163    sctp_route_t * ro,
3164    struct sctp_nets *net,
3165    int non_asoc_addr_ok, uint32_t vrf_id)
3166{
3167	struct sctp_ifa *answer;
3168	uint8_t dest_is_priv, dest_is_loop;
3169	sa_family_t fam;
3170
3171#ifdef INET
3172	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3173
3174#endif
3175#ifdef INET6
3176	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3177
3178#endif
3179
3180	/**
3181	 * Rules: - Find the route if needed, cache if I can. - Look at
3182	 * interface address in route, Is it in the bound list. If so we
3183	 * have the best source. - If not we must rotate amongst the
3184	 * addresses.
3185	 *
3186	 * Cavets and issues
3187	 *
3188	 * Do we need to pay attention to scope. We can have a private address
3189	 * or a global address we are sourcing or sending to. So if we draw
3190	 * it out
3191	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3192	 * For V4
3193	 * ------------------------------------------
3194	 *      source     *      dest  *  result
3195	 * -----------------------------------------
3196	 * <a>  Private    *    Global  *  NAT
3197	 * -----------------------------------------
3198	 * <b>  Private    *    Private *  No problem
3199	 * -----------------------------------------
3200	 * <c>  Global     *    Private *  Huh, How will this work?
3201	 * -----------------------------------------
3202	 * <d>  Global     *    Global  *  No Problem
3203	 *------------------------------------------
3204	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3205	 * For V6
3206	 *------------------------------------------
3207	 *      source     *      dest  *  result
3208	 * -----------------------------------------
3209	 * <a>  Linklocal  *    Global  *
3210	 * -----------------------------------------
3211	 * <b>  Linklocal  * Linklocal  *  No problem
3212	 * -----------------------------------------
3213	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3214	 * -----------------------------------------
3215	 * <d>  Global     *    Global  *  No Problem
3216	 *------------------------------------------
3217	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3218	 *
3219	 * And then we add to that what happens if there are multiple addresses
3220	 * assigned to an interface. Remember the ifa on a ifn is a linked
3221	 * list of addresses. So one interface can have more than one IP
3222	 * address. What happens if we have both a private and a global
3223	 * address? Do we then use context of destination to sort out which
3224	 * one is best? And what about NAT's sending P->G may get you a NAT
3225	 * translation, or should you select the G thats on the interface in
3226	 * preference.
3227	 *
3228	 * Decisions:
3229	 *
3230	 * - count the number of addresses on the interface.
3231	 * - if it is one, no problem except case <c>.
3232	 *   For <a> we will assume a NAT out there.
3233	 * - if there are more than one, then we need to worry about scope P
3234	 *   or G. We should prefer G -> G and P -> P if possible.
3235	 *   Then as a secondary fall back to mixed types G->P being a last
3236	 *   ditch one.
3237	 * - The above all works for bound all, but bound specific we need to
3238	 *   use the same concept but instead only consider the bound
3239	 *   addresses. If the bound set is NOT assigned to the interface then
3240	 *   we must use rotation amongst the bound addresses..
3241	 */
3242	if (ro->ro_rt == NULL) {
3243		/*
3244		 * Need a route to cache.
3245		 */
3246		SCTP_RTALLOC(ro, vrf_id);
3247	}
3248	if (ro->ro_rt == NULL) {
3249		return (NULL);
3250	}
3251	fam = ro->ro_dst.sa_family;
3252	dest_is_priv = dest_is_loop = 0;
3253	/* Setup our scopes for the destination */
3254	switch (fam) {
3255#ifdef INET
3256	case AF_INET:
3257		/* Scope based on outbound address */
3258		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3259			dest_is_loop = 1;
3260			if (net != NULL) {
3261				/* mark it as local */
3262				net->addr_is_local = 1;
3263			}
3264		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3265			dest_is_priv = 1;
3266		}
3267		break;
3268#endif
3269#ifdef INET6
3270	case AF_INET6:
3271		/* Scope based on outbound address */
3272		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3273		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3274			/*
3275			 * If the address is a loopback address, which
3276			 * consists of "::1" OR "fe80::1%lo0", we are
3277			 * loopback scope. But we don't use dest_is_priv
3278			 * (link local addresses).
3279			 */
3280			dest_is_loop = 1;
3281			if (net != NULL) {
3282				/* mark it as local */
3283				net->addr_is_local = 1;
3284			}
3285		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3286			dest_is_priv = 1;
3287		}
3288		break;
3289#endif
3290	}
3291	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3292	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3293	SCTP_IPI_ADDR_RLOCK();
3294	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3295		/*
3296		 * Bound all case
3297		 */
3298		answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3299		    dest_is_priv, dest_is_loop,
3300		    non_asoc_addr_ok, fam);
3301		SCTP_IPI_ADDR_RUNLOCK();
3302		return (answer);
3303	}
3304	/*
3305	 * Subset bound case
3306	 */
3307	if (stcb) {
3308		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3309		    vrf_id, dest_is_priv,
3310		    dest_is_loop,
3311		    non_asoc_addr_ok, fam);
3312	} else {
3313		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3314		    non_asoc_addr_ok,
3315		    dest_is_priv,
3316		    dest_is_loop, fam);
3317	}
3318	SCTP_IPI_ADDR_RUNLOCK();
3319	return (answer);
3320}
3321
3322static int
3323sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3324{
3325	struct cmsghdr cmh;
3326	int tlen, at, found;
3327	struct sctp_sndinfo sndinfo;
3328	struct sctp_prinfo prinfo;
3329	struct sctp_authinfo authinfo;
3330
3331	tlen = SCTP_BUF_LEN(control);
3332	at = 0;
3333	found = 0;
3334	/*
3335	 * Independent of how many mbufs, find the c_type inside the control
3336	 * structure and copy out the data.
3337	 */
3338	while (at < tlen) {
3339		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3340			/* There is not enough room for one more. */
3341			return (found);
3342		}
3343		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3344		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3345			/* We dont't have a complete CMSG header. */
3346			return (found);
3347		}
3348		if (((int)cmh.cmsg_len + at) > tlen) {
3349			/* We don't have the complete CMSG. */
3350			return (found);
3351		}
3352		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3353		    ((c_type == cmh.cmsg_type) ||
3354		    ((c_type == SCTP_SNDRCV) &&
3355		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3356		    (cmh.cmsg_type == SCTP_PRINFO) ||
3357		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3358			if (c_type == cmh.cmsg_type) {
3359				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3360					return (found);
3361				}
3362				/* It is exactly what we want. Copy it out. */
3363				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3364				return (1);
3365			} else {
3366				struct sctp_sndrcvinfo *sndrcvinfo;
3367
3368				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3369				if (found == 0) {
3370					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3371						return (found);
3372					}
3373					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3374				}
3375				switch (cmh.cmsg_type) {
3376				case SCTP_SNDINFO:
3377					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3378						return (found);
3379					}
3380					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3381					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3382					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3383					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3384					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3385					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3386					break;
3387				case SCTP_PRINFO:
3388					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3389						return (found);
3390					}
3391					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3392					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3393						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3394					} else {
3395						sndrcvinfo->sinfo_timetolive = 0;
3396					}
3397					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3398					break;
3399				case SCTP_AUTHINFO:
3400					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3401						return (found);
3402					}
3403					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3404					sndrcvinfo->sinfo_keynumber_valid = 1;
3405					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3406					break;
3407				default:
3408					return (found);
3409				}
3410				found = 1;
3411			}
3412		}
3413		at += CMSG_ALIGN(cmh.cmsg_len);
3414	}
3415	return (found);
3416}
3417
3418static int
3419sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3420{
3421	struct cmsghdr cmh;
3422	int tlen, at;
3423	struct sctp_initmsg initmsg;
3424
3425#ifdef INET
3426	struct sockaddr_in sin;
3427
3428#endif
3429#ifdef INET6
3430	struct sockaddr_in6 sin6;
3431
3432#endif
3433
3434	tlen = SCTP_BUF_LEN(control);
3435	at = 0;
3436	while (at < tlen) {
3437		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3438			/* There is not enough room for one more. */
3439			*error = EINVAL;
3440			return (1);
3441		}
3442		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3443		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3444			/* We dont't have a complete CMSG header. */
3445			*error = EINVAL;
3446			return (1);
3447		}
3448		if (((int)cmh.cmsg_len + at) > tlen) {
3449			/* We don't have the complete CMSG. */
3450			*error = EINVAL;
3451			return (1);
3452		}
3453		if (cmh.cmsg_level == IPPROTO_SCTP) {
3454			switch (cmh.cmsg_type) {
3455			case SCTP_INIT:
3456				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3457					*error = EINVAL;
3458					return (1);
3459				}
3460				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3461				if (initmsg.sinit_max_attempts)
3462					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3463				if (initmsg.sinit_num_ostreams)
3464					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3465				if (initmsg.sinit_max_instreams)
3466					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3467				if (initmsg.sinit_max_init_timeo)
3468					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3469				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3470					struct sctp_stream_out *tmp_str;
3471					unsigned int i;
3472
3473					/* Default is NOT correct */
3474					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3475					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3476					SCTP_TCB_UNLOCK(stcb);
3477					SCTP_MALLOC(tmp_str,
3478					    struct sctp_stream_out *,
3479					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3480					    SCTP_M_STRMO);
3481					SCTP_TCB_LOCK(stcb);
3482					if (tmp_str != NULL) {
3483						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3484						stcb->asoc.strmout = tmp_str;
3485						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3486					} else {
3487						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3488					}
3489					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3490						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3491						stcb->asoc.strmout[i].chunks_on_queues = 0;
3492						stcb->asoc.strmout[i].next_sequence_send = 0;
3493						stcb->asoc.strmout[i].stream_no = i;
3494						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3495						stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3496					}
3497				}
3498				break;
3499#ifdef INET
3500			case SCTP_DSTADDRV4:
3501				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3502					*error = EINVAL;
3503					return (1);
3504				}
3505				memset(&sin, 0, sizeof(struct sockaddr_in));
3506				sin.sin_family = AF_INET;
3507				sin.sin_len = sizeof(struct sockaddr_in);
3508				sin.sin_port = stcb->rport;
3509				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3510				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3511				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3512				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3513					*error = EINVAL;
3514					return (1);
3515				}
3516				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3517				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3518					*error = ENOBUFS;
3519					return (1);
3520				}
3521				break;
3522#endif
3523#ifdef INET6
3524			case SCTP_DSTADDRV6:
3525				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3526					*error = EINVAL;
3527					return (1);
3528				}
3529				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3530				sin6.sin6_family = AF_INET6;
3531				sin6.sin6_len = sizeof(struct sockaddr_in6);
3532				sin6.sin6_port = stcb->rport;
3533				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3534				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3535				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3536					*error = EINVAL;
3537					return (1);
3538				}
3539#ifdef INET
3540				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3541					in6_sin6_2_sin(&sin, &sin6);
3542					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3543					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3544					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3545						*error = EINVAL;
3546						return (1);
3547					}
3548					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3549					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3550						*error = ENOBUFS;
3551						return (1);
3552					}
3553				} else
3554#endif
3555					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3556				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3557					*error = ENOBUFS;
3558					return (1);
3559				}
3560				break;
3561#endif
3562			default:
3563				break;
3564			}
3565		}
3566		at += CMSG_ALIGN(cmh.cmsg_len);
3567	}
3568	return (0);
3569}
3570
3571static struct sctp_tcb *
3572sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3573    uint16_t port,
3574    struct mbuf *control,
3575    struct sctp_nets **net_p,
3576    int *error)
3577{
3578	struct cmsghdr cmh;
3579	int tlen, at;
3580	struct sctp_tcb *stcb;
3581	struct sockaddr *addr;
3582
3583#ifdef INET
3584	struct sockaddr_in sin;
3585
3586#endif
3587#ifdef INET6
3588	struct sockaddr_in6 sin6;
3589
3590#endif
3591
3592	tlen = SCTP_BUF_LEN(control);
3593	at = 0;
3594	while (at < tlen) {
3595		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3596			/* There is not enough room for one more. */
3597			*error = EINVAL;
3598			return (NULL);
3599		}
3600		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3601		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3602			/* We dont't have a complete CMSG header. */
3603			*error = EINVAL;
3604			return (NULL);
3605		}
3606		if (((int)cmh.cmsg_len + at) > tlen) {
3607			/* We don't have the complete CMSG. */
3608			*error = EINVAL;
3609			return (NULL);
3610		}
3611		if (cmh.cmsg_level == IPPROTO_SCTP) {
3612			switch (cmh.cmsg_type) {
3613#ifdef INET
3614			case SCTP_DSTADDRV4:
3615				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3616					*error = EINVAL;
3617					return (NULL);
3618				}
3619				memset(&sin, 0, sizeof(struct sockaddr_in));
3620				sin.sin_family = AF_INET;
3621				sin.sin_len = sizeof(struct sockaddr_in);
3622				sin.sin_port = port;
3623				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3624				addr = (struct sockaddr *)&sin;
3625				break;
3626#endif
3627#ifdef INET6
3628			case SCTP_DSTADDRV6:
3629				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3630					*error = EINVAL;
3631					return (NULL);
3632				}
3633				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3634				sin6.sin6_family = AF_INET6;
3635				sin6.sin6_len = sizeof(struct sockaddr_in6);
3636				sin6.sin6_port = port;
3637				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3638#ifdef INET
3639				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3640					in6_sin6_2_sin(&sin, &sin6);
3641					addr = (struct sockaddr *)&sin;
3642				} else
3643#endif
3644					addr = (struct sockaddr *)&sin6;
3645				break;
3646#endif
3647			default:
3648				addr = NULL;
3649				break;
3650			}
3651			if (addr) {
3652				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3653				if (stcb != NULL) {
3654					return (stcb);
3655				}
3656			}
3657		}
3658		at += CMSG_ALIGN(cmh.cmsg_len);
3659	}
3660	return (NULL);
3661}
3662
3663static struct mbuf *
3664sctp_add_cookie(struct mbuf *init, int init_offset,
3665    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3666{
3667	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3668	struct sctp_state_cookie *stc;
3669	struct sctp_paramhdr *ph;
3670	uint8_t *foo;
3671	int sig_offset;
3672	uint16_t cookie_sz;
3673
3674	mret = NULL;
3675	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3676	    sizeof(struct sctp_paramhdr)), 0,
3677	    M_NOWAIT, 1, MT_DATA);
3678	if (mret == NULL) {
3679		return (NULL);
3680	}
3681	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3682	if (copy_init == NULL) {
3683		sctp_m_freem(mret);
3684		return (NULL);
3685	}
3686#ifdef SCTP_MBUF_LOGGING
3687	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3688		struct mbuf *mat;
3689
3690		for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3691			if (SCTP_BUF_IS_EXTENDED(mat)) {
3692				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3693			}
3694		}
3695	}
3696#endif
3697	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3698	    M_NOWAIT);
3699	if (copy_initack == NULL) {
3700		sctp_m_freem(mret);
3701		sctp_m_freem(copy_init);
3702		return (NULL);
3703	}
3704#ifdef SCTP_MBUF_LOGGING
3705	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3706		struct mbuf *mat;
3707
3708		for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3709			if (SCTP_BUF_IS_EXTENDED(mat)) {
3710				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3711			}
3712		}
3713	}
3714#endif
3715	/* easy side we just drop it on the end */
3716	ph = mtod(mret, struct sctp_paramhdr *);
3717	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3718	    sizeof(struct sctp_paramhdr);
3719	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3720	    sizeof(struct sctp_paramhdr));
3721	ph->param_type = htons(SCTP_STATE_COOKIE);
3722	ph->param_length = 0;	/* fill in at the end */
3723	/* Fill in the stc cookie data */
3724	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3725
3726	/* tack the INIT and then the INIT-ACK onto the chain */
3727	cookie_sz = 0;
3728	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3729		cookie_sz += SCTP_BUF_LEN(m_at);
3730		if (SCTP_BUF_NEXT(m_at) == NULL) {
3731			SCTP_BUF_NEXT(m_at) = copy_init;
3732			break;
3733		}
3734	}
3735	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3736		cookie_sz += SCTP_BUF_LEN(m_at);
3737		if (SCTP_BUF_NEXT(m_at) == NULL) {
3738			SCTP_BUF_NEXT(m_at) = copy_initack;
3739			break;
3740		}
3741	}
3742	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3743		cookie_sz += SCTP_BUF_LEN(m_at);
3744		if (SCTP_BUF_NEXT(m_at) == NULL) {
3745			break;
3746		}
3747	}
3748	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3749	if (sig == NULL) {
3750		/* no space, so free the entire chain */
3751		sctp_m_freem(mret);
3752		return (NULL);
3753	}
3754	SCTP_BUF_LEN(sig) = 0;
3755	SCTP_BUF_NEXT(m_at) = sig;
3756	sig_offset = 0;
3757	foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3758	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3759	*signature = foo;
3760	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3761	cookie_sz += SCTP_SIGNATURE_SIZE;
3762	ph->param_length = htons(cookie_sz);
3763	return (mret);
3764}
3765
3766
3767static uint8_t
3768sctp_get_ect(struct sctp_tcb *stcb)
3769{
3770	if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3771		return (SCTP_ECT0_BIT);
3772	} else {
3773		return (0);
3774	}
3775}
3776
3777#if defined(INET) || defined(INET6)
3778static void
3779sctp_handle_no_route(struct sctp_tcb *stcb,
3780    struct sctp_nets *net,
3781    int so_locked)
3782{
3783	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3784
3785	if (net) {
3786		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3787		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3788		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3789			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3790				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3791				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3792				    stcb, 0,
3793				    (void *)net,
3794				    so_locked);
3795				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3796				net->dest_state &= ~SCTP_ADDR_PF;
3797			}
3798		}
3799		if (stcb) {
3800			if (net == stcb->asoc.primary_destination) {
3801				/* need a new primary */
3802				struct sctp_nets *alt;
3803
3804				alt = sctp_find_alternate_net(stcb, net, 0);
3805				if (alt != net) {
3806					if (stcb->asoc.alternate) {
3807						sctp_free_remote_addr(stcb->asoc.alternate);
3808					}
3809					stcb->asoc.alternate = alt;
3810					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3811					if (net->ro._s_addr) {
3812						sctp_free_ifa(net->ro._s_addr);
3813						net->ro._s_addr = NULL;
3814					}
3815					net->src_addr_selected = 0;
3816				}
3817			}
3818		}
3819	}
3820}
3821
3822#endif
3823
3824static int
3825sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3826    struct sctp_tcb *stcb,	/* may be NULL */
3827    struct sctp_nets *net,
3828    struct sockaddr *to,
3829    struct mbuf *m,
3830    uint32_t auth_offset,
3831    struct sctp_auth_chunk *auth,
3832    uint16_t auth_keyid,
3833    int nofragment_flag,
3834    int ecn_ok,
3835    int out_of_asoc_ok,
3836    uint16_t src_port,
3837    uint16_t dest_port,
3838    uint32_t v_tag,
3839    uint16_t port,
3840    union sctp_sockstore *over_addr,
3841    uint8_t use_mflowid, uint32_t mflowid,
3842#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3843    int so_locked SCTP_UNUSED
3844#else
3845    int so_locked
3846#endif
3847)
3848/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3849{
3850	/**
3851	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3852	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3853	 * - fill in the HMAC digest of any AUTH chunk in the packet.
3854	 * - calculate and fill in the SCTP checksum.
3855	 * - prepend an IP address header.
3856	 * - if boundall use INADDR_ANY.
3857	 * - if boundspecific do source address selection.
3858	 * - set fragmentation option for ipV4.
3859	 * - On return from IP output, check/adjust mtu size of output
3860	 *   interface and smallest_mtu size as well.
3861	 */
3862	/* Will need ifdefs around this */
3863	struct mbuf *newm;
3864	struct sctphdr *sctphdr;
3865	int packet_length;
3866	int ret;
3867
3868#if defined(INET) || defined(INET6)
3869	uint32_t vrf_id;
3870
3871#endif
3872#if defined(INET) || defined(INET6)
3873	struct mbuf *o_pak;
3874	sctp_route_t *ro = NULL;
3875	struct udphdr *udp = NULL;
3876
3877#endif
3878	uint8_t tos_value;
3879
3880#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3881	struct socket *so = NULL;
3882
3883#endif
3884
3885	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3886		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3887		sctp_m_freem(m);
3888		return (EFAULT);
3889	}
3890#if defined(INET) || defined(INET6)
3891	if (stcb) {
3892		vrf_id = stcb->asoc.vrf_id;
3893	} else {
3894		vrf_id = inp->def_vrf_id;
3895	}
3896#endif
3897	/* fill in the HMAC digest for any AUTH chunk in the packet */
3898	if ((auth != NULL) && (stcb != NULL)) {
3899		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3900	}
3901	if (net) {
3902		tos_value = net->dscp;
3903	} else if (stcb) {
3904		tos_value = stcb->asoc.default_dscp;
3905	} else {
3906		tos_value = inp->sctp_ep.default_dscp;
3907	}
3908
3909	switch (to->sa_family) {
3910#ifdef INET
3911	case AF_INET:
3912		{
3913			struct ip *ip = NULL;
3914			sctp_route_t iproute;
3915			int len;
3916
3917			len = sizeof(struct ip) + sizeof(struct sctphdr);
3918			if (port) {
3919				len += sizeof(struct udphdr);
3920			}
3921			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
3922			if (newm == NULL) {
3923				sctp_m_freem(m);
3924				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3925				return (ENOMEM);
3926			}
3927			SCTP_ALIGN_TO_END(newm, len);
3928			SCTP_BUF_LEN(newm) = len;
3929			SCTP_BUF_NEXT(newm) = m;
3930			m = newm;
3931			if (net != NULL) {
3932#ifdef INVARIANTS
3933				if (net->flowidset == 0) {
3934					panic("Flow ID not set");
3935				}
3936#endif
3937				m->m_pkthdr.flowid = net->flowid;
3938				m->m_flags |= M_FLOWID;
3939			} else {
3940				if (use_mflowid != 0) {
3941					m->m_pkthdr.flowid = mflowid;
3942					m->m_flags |= M_FLOWID;
3943				}
3944			}
3945			packet_length = sctp_calculate_len(m);
3946			ip = mtod(m, struct ip *);
3947			ip->ip_v = IPVERSION;
3948			ip->ip_hl = (sizeof(struct ip) >> 2);
3949			if (tos_value == 0) {
3950				/*
3951				 * This means especially, that it is not set
3952				 * at the SCTP layer. So use the value from
3953				 * the IP layer.
3954				 */
3955				tos_value = inp->ip_inp.inp.inp_ip_tos;
3956			}
3957			tos_value &= 0xfc;
3958			if (ecn_ok) {
3959				tos_value |= sctp_get_ect(stcb);
3960			}
3961			if ((nofragment_flag) && (port == 0)) {
3962				ip->ip_off = htons(IP_DF);
3963			} else {
3964				ip->ip_off = htons(0);
3965			}
3966			/* FreeBSD has a function for ip_id's */
3967			ip->ip_id = ip_newid();
3968
3969			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3970			ip->ip_len = htons(packet_length);
3971			ip->ip_tos = tos_value;
3972			if (port) {
3973				ip->ip_p = IPPROTO_UDP;
3974			} else {
3975				ip->ip_p = IPPROTO_SCTP;
3976			}
3977			ip->ip_sum = 0;
3978			if (net == NULL) {
3979				ro = &iproute;
3980				memset(&iproute, 0, sizeof(iproute));
3981				memcpy(&ro->ro_dst, to, to->sa_len);
3982			} else {
3983				ro = (sctp_route_t *) & net->ro;
3984			}
3985			/* Now the address selection part */
3986			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3987
3988			/* call the routine to select the src address */
3989			if (net && out_of_asoc_ok == 0) {
3990				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3991					sctp_free_ifa(net->ro._s_addr);
3992					net->ro._s_addr = NULL;
3993					net->src_addr_selected = 0;
3994					if (ro->ro_rt) {
3995						RTFREE(ro->ro_rt);
3996						ro->ro_rt = NULL;
3997					}
3998				}
3999				if (net->src_addr_selected == 0) {
4000					/* Cache the source address */
4001					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4002					    ro, net, 0,
4003					    vrf_id);
4004					net->src_addr_selected = 1;
4005				}
4006				if (net->ro._s_addr == NULL) {
4007					/* No route to host */
4008					net->src_addr_selected = 0;
4009					sctp_handle_no_route(stcb, net, so_locked);
4010					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4011					sctp_m_freem(m);
4012					return (EHOSTUNREACH);
4013				}
4014				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4015			} else {
4016				if (over_addr == NULL) {
4017					struct sctp_ifa *_lsrc;
4018
4019					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4020					    net,
4021					    out_of_asoc_ok,
4022					    vrf_id);
4023					if (_lsrc == NULL) {
4024						sctp_handle_no_route(stcb, net, so_locked);
4025						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4026						sctp_m_freem(m);
4027						return (EHOSTUNREACH);
4028					}
4029					ip->ip_src = _lsrc->address.sin.sin_addr;
4030					sctp_free_ifa(_lsrc);
4031				} else {
4032					ip->ip_src = over_addr->sin.sin_addr;
4033					SCTP_RTALLOC(ro, vrf_id);
4034				}
4035			}
4036			if (port) {
4037				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4038					sctp_handle_no_route(stcb, net, so_locked);
4039					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4040					sctp_m_freem(m);
4041					return (EHOSTUNREACH);
4042				}
4043				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4044				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4045				udp->uh_dport = port;
4046				udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4047				if (V_udp_cksum) {
4048					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4049				} else {
4050					udp->uh_sum = 0;
4051				}
4052				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4053			} else {
4054				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4055			}
4056
4057			sctphdr->src_port = src_port;
4058			sctphdr->dest_port = dest_port;
4059			sctphdr->v_tag = v_tag;
4060			sctphdr->checksum = 0;
4061
4062			/*
4063			 * If source address selection fails and we find no
4064			 * route then the ip_output should fail as well with
4065			 * a NO_ROUTE_TO_HOST type error. We probably should
4066			 * catch that somewhere and abort the association
4067			 * right away (assuming this is an INIT being sent).
4068			 */
4069			if (ro->ro_rt == NULL) {
4070				/*
4071				 * src addr selection failed to find a route
4072				 * (or valid source addr), so we can't get
4073				 * there from here (yet)!
4074				 */
4075				sctp_handle_no_route(stcb, net, so_locked);
4076				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4077				sctp_m_freem(m);
4078				return (EHOSTUNREACH);
4079			}
4080			if (ro != &iproute) {
4081				memcpy(&iproute, ro, sizeof(*ro));
4082			}
4083			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4084			    (uint32_t) (ntohl(ip->ip_src.s_addr)));
4085			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4086			    (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4087			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4088			    (void *)ro->ro_rt);
4089
4090			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4091				/* failed to prepend data, give up */
4092				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4093				sctp_m_freem(m);
4094				return (ENOMEM);
4095			}
4096			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4097			if (port) {
4098#if defined(SCTP_WITH_NO_CSUM)
4099				SCTP_STAT_INCR(sctps_sendnocrc);
4100#else
4101				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4102				SCTP_STAT_INCR(sctps_sendswcrc);
4103#endif
4104				if (V_udp_cksum) {
4105					SCTP_ENABLE_UDP_CSUM(o_pak);
4106				}
4107			} else {
4108#if defined(SCTP_WITH_NO_CSUM)
4109				SCTP_STAT_INCR(sctps_sendnocrc);
4110#else
4111				m->m_pkthdr.csum_flags = CSUM_SCTP;
4112				m->m_pkthdr.csum_data = 0;
4113				SCTP_STAT_INCR(sctps_sendhwcrc);
4114#endif
4115			}
4116#ifdef SCTP_PACKET_LOGGING
4117			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4118				sctp_packet_log(o_pak);
4119#endif
4120			/* send it out.  table id is taken from stcb */
4121#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4122			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4123				so = SCTP_INP_SO(inp);
4124				SCTP_SOCKET_UNLOCK(so, 0);
4125			}
4126#endif
4127			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4128#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4129			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4130				atomic_add_int(&stcb->asoc.refcnt, 1);
4131				SCTP_TCB_UNLOCK(stcb);
4132				SCTP_SOCKET_LOCK(so, 0);
4133				SCTP_TCB_LOCK(stcb);
4134				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4135			}
4136#endif
4137			SCTP_STAT_INCR(sctps_sendpackets);
4138			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4139			if (ret)
4140				SCTP_STAT_INCR(sctps_senderrors);
4141
4142			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4143			if (net == NULL) {
4144				/* free tempy routes */
4145				RO_RTFREE(ro);
4146			} else {
4147				/*
4148				 * PMTU check versus smallest asoc MTU goes
4149				 * here
4150				 */
4151				if ((ro->ro_rt != NULL) &&
4152				    (net->ro._s_addr)) {
4153					uint32_t mtu;
4154
4155					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4156					if (net->port) {
4157						mtu -= sizeof(struct udphdr);
4158					}
4159					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4160						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4161						net->mtu = mtu;
4162					}
4163				} else if (ro->ro_rt == NULL) {
4164					/* route was freed */
4165					if (net->ro._s_addr &&
4166					    net->src_addr_selected) {
4167						sctp_free_ifa(net->ro._s_addr);
4168						net->ro._s_addr = NULL;
4169					}
4170					net->src_addr_selected = 0;
4171				}
4172			}
4173			return (ret);
4174		}
4175#endif
4176#ifdef INET6
4177	case AF_INET6:
4178		{
4179			uint32_t flowlabel, flowinfo;
4180			struct ip6_hdr *ip6h;
4181			struct route_in6 ip6route;
4182			struct ifnet *ifp;
4183			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4184			int prev_scope = 0;
4185			struct sockaddr_in6 lsa6_storage;
4186			int error;
4187			u_short prev_port = 0;
4188			int len;
4189
4190			if (net) {
4191				flowlabel = net->flowlabel;
4192			} else if (stcb) {
4193				flowlabel = stcb->asoc.default_flowlabel;
4194			} else {
4195				flowlabel = inp->sctp_ep.default_flowlabel;
4196			}
4197			if (flowlabel == 0) {
4198				/*
4199				 * This means especially, that it is not set
4200				 * at the SCTP layer. So use the value from
4201				 * the IP layer.
4202				 */
4203				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4204			}
4205			flowlabel &= 0x000fffff;
4206			len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4207			if (port) {
4208				len += sizeof(struct udphdr);
4209			}
4210			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4211			if (newm == NULL) {
4212				sctp_m_freem(m);
4213				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4214				return (ENOMEM);
4215			}
4216			SCTP_ALIGN_TO_END(newm, len);
4217			SCTP_BUF_LEN(newm) = len;
4218			SCTP_BUF_NEXT(newm) = m;
4219			m = newm;
4220			if (net != NULL) {
4221#ifdef INVARIANTS
4222				if (net->flowidset == 0) {
4223					panic("Flow ID not set");
4224				}
4225#endif
4226				m->m_pkthdr.flowid = net->flowid;
4227				m->m_flags |= M_FLOWID;
4228			} else {
4229				if (use_mflowid != 0) {
4230					m->m_pkthdr.flowid = mflowid;
4231					m->m_flags |= M_FLOWID;
4232				}
4233			}
4234			packet_length = sctp_calculate_len(m);
4235
4236			ip6h = mtod(m, struct ip6_hdr *);
4237			/* protect *sin6 from overwrite */
4238			sin6 = (struct sockaddr_in6 *)to;
4239			tmp = *sin6;
4240			sin6 = &tmp;
4241
4242			/* KAME hack: embed scopeid */
4243			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4244				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4245				return (EINVAL);
4246			}
4247			if (net == NULL) {
4248				memset(&ip6route, 0, sizeof(ip6route));
4249				ro = (sctp_route_t *) & ip6route;
4250				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4251			} else {
4252				ro = (sctp_route_t *) & net->ro;
4253			}
4254			/*
4255			 * We assume here that inp_flow is in host byte
4256			 * order within the TCB!
4257			 */
4258			if (tos_value == 0) {
4259				/*
4260				 * This means especially, that it is not set
4261				 * at the SCTP layer. So use the value from
4262				 * the IP layer.
4263				 */
4264				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4265			}
4266			tos_value &= 0xfc;
4267			if (ecn_ok) {
4268				tos_value |= sctp_get_ect(stcb);
4269			}
4270			flowinfo = 0x06;
4271			flowinfo <<= 8;
4272			flowinfo |= tos_value;
4273			flowinfo <<= 20;
4274			flowinfo |= flowlabel;
4275			ip6h->ip6_flow = htonl(flowinfo);
4276			if (port) {
4277				ip6h->ip6_nxt = IPPROTO_UDP;
4278			} else {
4279				ip6h->ip6_nxt = IPPROTO_SCTP;
4280			}
4281			ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4282			ip6h->ip6_dst = sin6->sin6_addr;
4283
4284			/*
4285			 * Add SRC address selection here: we can only reuse
4286			 * to a limited degree the kame src-addr-sel, since
4287			 * we can try their selection but it may not be
4288			 * bound.
4289			 */
4290			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4291			lsa6_tmp.sin6_family = AF_INET6;
4292			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4293			lsa6 = &lsa6_tmp;
4294			if (net && out_of_asoc_ok == 0) {
4295				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4296					sctp_free_ifa(net->ro._s_addr);
4297					net->ro._s_addr = NULL;
4298					net->src_addr_selected = 0;
4299					if (ro->ro_rt) {
4300						RTFREE(ro->ro_rt);
4301						ro->ro_rt = NULL;
4302					}
4303				}
4304				if (net->src_addr_selected == 0) {
4305					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4306					/* KAME hack: embed scopeid */
4307					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4308						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4309						return (EINVAL);
4310					}
4311					/* Cache the source address */
4312					net->ro._s_addr = sctp_source_address_selection(inp,
4313					    stcb,
4314					    ro,
4315					    net,
4316					    0,
4317					    vrf_id);
4318					(void)sa6_recoverscope(sin6);
4319					net->src_addr_selected = 1;
4320				}
4321				if (net->ro._s_addr == NULL) {
4322					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4323					net->src_addr_selected = 0;
4324					sctp_handle_no_route(stcb, net, so_locked);
4325					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4326					sctp_m_freem(m);
4327					return (EHOSTUNREACH);
4328				}
4329				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4330			} else {
4331				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4332				/* KAME hack: embed scopeid */
4333				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4334					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4335					return (EINVAL);
4336				}
4337				if (over_addr == NULL) {
4338					struct sctp_ifa *_lsrc;
4339
4340					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4341					    net,
4342					    out_of_asoc_ok,
4343					    vrf_id);
4344					if (_lsrc == NULL) {
4345						sctp_handle_no_route(stcb, net, so_locked);
4346						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4347						sctp_m_freem(m);
4348						return (EHOSTUNREACH);
4349					}
4350					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4351					sctp_free_ifa(_lsrc);
4352				} else {
4353					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4354					SCTP_RTALLOC(ro, vrf_id);
4355				}
4356				(void)sa6_recoverscope(sin6);
4357			}
4358			lsa6->sin6_port = inp->sctp_lport;
4359
4360			if (ro->ro_rt == NULL) {
4361				/*
4362				 * src addr selection failed to find a route
4363				 * (or valid source addr), so we can't get
4364				 * there from here!
4365				 */
4366				sctp_handle_no_route(stcb, net, so_locked);
4367				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4368				sctp_m_freem(m);
4369				return (EHOSTUNREACH);
4370			}
4371			/*
4372			 * XXX: sa6 may not have a valid sin6_scope_id in
4373			 * the non-SCOPEDROUTING case.
4374			 */
4375			bzero(&lsa6_storage, sizeof(lsa6_storage));
4376			lsa6_storage.sin6_family = AF_INET6;
4377			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4378			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4379			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4380				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4381				sctp_m_freem(m);
4382				return (error);
4383			}
4384			/* XXX */
4385			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4386			lsa6_storage.sin6_port = inp->sctp_lport;
4387			lsa6 = &lsa6_storage;
4388			ip6h->ip6_src = lsa6->sin6_addr;
4389
4390			if (port) {
4391				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4392					sctp_handle_no_route(stcb, net, so_locked);
4393					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4394					sctp_m_freem(m);
4395					return (EHOSTUNREACH);
4396				}
4397				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4398				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4399				udp->uh_dport = port;
4400				udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4401				udp->uh_sum = 0;
4402				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4403			} else {
4404				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4405			}
4406
4407			sctphdr->src_port = src_port;
4408			sctphdr->dest_port = dest_port;
4409			sctphdr->v_tag = v_tag;
4410			sctphdr->checksum = 0;
4411
4412			/*
4413			 * We set the hop limit now since there is a good
4414			 * chance that our ro pointer is now filled
4415			 */
4416			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4417			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4418
4419#ifdef SCTP_DEBUG
4420			/* Copy to be sure something bad is not happening */
4421			sin6->sin6_addr = ip6h->ip6_dst;
4422			lsa6->sin6_addr = ip6h->ip6_src;
4423#endif
4424
4425			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4426			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4427			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4428			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4429			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4430			if (net) {
4431				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4432				/*
4433				 * preserve the port and scope for link
4434				 * local send
4435				 */
4436				prev_scope = sin6->sin6_scope_id;
4437				prev_port = sin6->sin6_port;
4438			}
4439			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4440				/* failed to prepend data, give up */
4441				sctp_m_freem(m);
4442				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4443				return (ENOMEM);
4444			}
4445			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4446			if (port) {
4447#if defined(SCTP_WITH_NO_CSUM)
4448				SCTP_STAT_INCR(sctps_sendnocrc);
4449#else
4450				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4451				SCTP_STAT_INCR(sctps_sendswcrc);
4452#endif
4453				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4454					udp->uh_sum = 0xffff;
4455				}
4456			} else {
4457#if defined(SCTP_WITH_NO_CSUM)
4458				SCTP_STAT_INCR(sctps_sendnocrc);
4459#else
4460				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4461				m->m_pkthdr.csum_data = 0;
4462				SCTP_STAT_INCR(sctps_sendhwcrc);
4463#endif
4464			}
4465			/* send it out. table id is taken from stcb */
4466#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4467			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4468				so = SCTP_INP_SO(inp);
4469				SCTP_SOCKET_UNLOCK(so, 0);
4470			}
4471#endif
4472#ifdef SCTP_PACKET_LOGGING
4473			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4474				sctp_packet_log(o_pak);
4475#endif
4476			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4477#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4478			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4479				atomic_add_int(&stcb->asoc.refcnt, 1);
4480				SCTP_TCB_UNLOCK(stcb);
4481				SCTP_SOCKET_LOCK(so, 0);
4482				SCTP_TCB_LOCK(stcb);
4483				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4484			}
4485#endif
4486			if (net) {
4487				/* for link local this must be done */
4488				sin6->sin6_scope_id = prev_scope;
4489				sin6->sin6_port = prev_port;
4490			}
4491			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4492			SCTP_STAT_INCR(sctps_sendpackets);
4493			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4494			if (ret) {
4495				SCTP_STAT_INCR(sctps_senderrors);
4496			}
4497			if (net == NULL) {
4498				/* Now if we had a temp route free it */
4499				RO_RTFREE(ro);
4500			} else {
4501				/*
4502				 * PMTU check versus smallest asoc MTU goes
4503				 * here
4504				 */
4505				if (ro->ro_rt == NULL) {
4506					/* Route was freed */
4507					if (net->ro._s_addr &&
4508					    net->src_addr_selected) {
4509						sctp_free_ifa(net->ro._s_addr);
4510						net->ro._s_addr = NULL;
4511					}
4512					net->src_addr_selected = 0;
4513				}
4514				if ((ro->ro_rt != NULL) &&
4515				    (net->ro._s_addr)) {
4516					uint32_t mtu;
4517
4518					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4519					if (mtu &&
4520					    (stcb->asoc.smallest_mtu > mtu)) {
4521						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4522						net->mtu = mtu;
4523						if (net->port) {
4524							net->mtu -= sizeof(struct udphdr);
4525						}
4526					}
4527				} else if (ifp) {
4528					if (ND_IFINFO(ifp)->linkmtu &&
4529					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4530						sctp_mtu_size_reset(inp,
4531						    &stcb->asoc,
4532						    ND_IFINFO(ifp)->linkmtu);
4533					}
4534				}
4535			}
4536			return (ret);
4537		}
4538#endif
4539	default:
4540		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4541		    ((struct sockaddr *)to)->sa_family);
4542		sctp_m_freem(m);
4543		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4544		return (EFAULT);
4545	}
4546}
4547
4548
4549void
4550sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4551#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4552    SCTP_UNUSED
4553#endif
4554)
4555{
4556	struct mbuf *m;
4557	struct sctp_nets *net;
4558	struct sctp_init_chunk *init;
4559	struct sctp_supported_addr_param *sup_addr;
4560	struct sctp_adaptation_layer_indication *ali;
4561	struct sctp_supported_chunk_types_param *pr_supported;
4562	struct sctp_paramhdr *ph;
4563	int cnt_inits_to = 0;
4564	int ret;
4565	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4566
4567	/* INIT's always go to the primary (and usually ONLY address) */
4568	net = stcb->asoc.primary_destination;
4569	if (net == NULL) {
4570		net = TAILQ_FIRST(&stcb->asoc.nets);
4571		if (net == NULL) {
4572			/* TSNH */
4573			return;
4574		}
4575		/* we confirm any address we send an INIT to */
4576		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4577		(void)sctp_set_primary_addr(stcb, NULL, net);
4578	} else {
4579		/* we confirm any address we send an INIT to */
4580		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4581	}
4582	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4583#ifdef INET6
4584	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4585		/*
4586		 * special hook, if we are sending to link local it will not
4587		 * show up in our private address count.
4588		 */
4589		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4590			cnt_inits_to = 1;
4591	}
4592#endif
4593	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4594		/* This case should not happen */
4595		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4596		return;
4597	}
4598	/* start the INIT timer */
4599	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4600
4601	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4602	if (m == NULL) {
4603		/* No memory, INIT timer will re-attempt. */
4604		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4605		return;
4606	}
4607	chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4608	padding_len = 0;
4609	/*
4610	 * assume peer supports asconf in order to be able to queue local
4611	 * address changes while an INIT is in flight and before the assoc
4612	 * is established.
4613	 */
4614	stcb->asoc.peer_supports_asconf = 1;
4615	/* Now lets put the chunk header in place */
4616	init = mtod(m, struct sctp_init_chunk *);
4617	/* now the chunk header */
4618	init->ch.chunk_type = SCTP_INITIATION;
4619	init->ch.chunk_flags = 0;
4620	/* fill in later from mbuf we build */
4621	init->ch.chunk_length = 0;
4622	/* place in my tag */
4623	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4624	/* set up some of the credits. */
4625	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4626	    SCTP_MINIMAL_RWND));
4627	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4628	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4629	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4630
4631	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4632		uint8_t i;
4633
4634		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4635		if (stcb->asoc.scope.ipv4_addr_legal) {
4636			parameter_len += (uint16_t) sizeof(uint16_t);
4637		}
4638		if (stcb->asoc.scope.ipv6_addr_legal) {
4639			parameter_len += (uint16_t) sizeof(uint16_t);
4640		}
4641		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4642		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4643		sup_addr->ph.param_length = htons(parameter_len);
4644		i = 0;
4645		if (stcb->asoc.scope.ipv4_addr_legal) {
4646			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4647		}
4648		if (stcb->asoc.scope.ipv6_addr_legal) {
4649			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4650		}
4651		padding_len = 4 - 2 * i;
4652		chunk_len += parameter_len;
4653	}
4654	/* Adaptation layer indication parameter */
4655	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4656		if (padding_len > 0) {
4657			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4658			chunk_len += padding_len;
4659			padding_len = 0;
4660		}
4661		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4662		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4663		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4664		ali->ph.param_length = htons(parameter_len);
4665		ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4666		chunk_len += parameter_len;
4667	}
4668	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4669		/* Add NAT friendly parameter. */
4670		if (padding_len > 0) {
4671			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4672			chunk_len += padding_len;
4673			padding_len = 0;
4674		}
4675		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4676		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4677		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4678		ph->param_length = htons(parameter_len);
4679		chunk_len += parameter_len;
4680	}
4681	/* now any cookie time extensions */
4682	if (stcb->asoc.cookie_preserve_req) {
4683		struct sctp_cookie_perserve_param *cookie_preserve;
4684
4685		if (padding_len > 0) {
4686			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4687			chunk_len += padding_len;
4688			padding_len = 0;
4689		}
4690		parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4691		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4692		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4693		cookie_preserve->ph.param_length = htons(parameter_len);
4694		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4695		stcb->asoc.cookie_preserve_req = 0;
4696		chunk_len += parameter_len;
4697	}
4698	/* ECN parameter */
4699	if (stcb->asoc.ecn_allowed == 1) {
4700		if (padding_len > 0) {
4701			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4702			chunk_len += padding_len;
4703			padding_len = 0;
4704		}
4705		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4706		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4707		ph->param_type = htons(SCTP_ECN_CAPABLE);
4708		ph->param_length = htons(parameter_len);
4709		chunk_len += parameter_len;
4710	}
4711	/* And now tell the peer we do support PR-SCTP. */
4712	if (padding_len > 0) {
4713		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4714		chunk_len += padding_len;
4715		padding_len = 0;
4716	}
4717	parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4718	ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4719	ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4720	ph->param_length = htons(parameter_len);
4721	chunk_len += parameter_len;
4722
4723	/* And now tell the peer we do all the extensions */
4724	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4725	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4726	num_ext = 0;
4727	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4728	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4729	pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4730	pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4731	pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4732	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4733		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4734	}
4735	if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4736		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4737	}
4738	parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4739	pr_supported->ph.param_length = htons(parameter_len);
4740	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4741	chunk_len += parameter_len;
4742
4743	/* add authentication parameters */
4744	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4745		/* attach RANDOM parameter, if available */
4746		if (stcb->asoc.authinfo.random != NULL) {
4747			struct sctp_auth_random *randp;
4748
4749			if (padding_len > 0) {
4750				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4751				chunk_len += padding_len;
4752				padding_len = 0;
4753			}
4754			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4755			parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4756			/* random key already contains the header */
4757			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4758			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4759			chunk_len += parameter_len;
4760		}
4761		/* add HMAC_ALGO parameter */
4762		if ((stcb->asoc.local_hmacs != NULL) &&
4763		    (stcb->asoc.local_hmacs->num_algo > 0)) {
4764			struct sctp_auth_hmac_algo *hmacs;
4765
4766			if (padding_len > 0) {
4767				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4768				chunk_len += padding_len;
4769				padding_len = 0;
4770			}
4771			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4772			parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4773			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4774			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4775			hmacs->ph.param_length = htons(parameter_len);
4776			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4777			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4778			chunk_len += parameter_len;
4779		}
4780		/* add CHUNKS parameter */
4781		if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4782			struct sctp_auth_chunk_list *chunks;
4783
4784			if (padding_len > 0) {
4785				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4786				chunk_len += padding_len;
4787				padding_len = 0;
4788			}
4789			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4790			parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4791			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4792			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4793			chunks->ph.param_length = htons(parameter_len);
4794			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4795			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4796			chunk_len += parameter_len;
4797		}
4798	}
4799	SCTP_BUF_LEN(m) = chunk_len;
4800
4801	/* now the addresses */
4802	/*
4803	 * To optimize this we could put the scoping stuff into a structure
4804	 * and remove the individual uint8's from the assoc structure. Then
4805	 * we could just sifa in the address within the stcb. But for now
4806	 * this is a quick hack to get the address stuff teased apart.
4807	 */
4808	sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope, m, cnt_inits_to, &padding_len, &chunk_len);
4809
4810	init->ch.chunk_length = htons(chunk_len);
4811	if (padding_len > 0) {
4812		struct mbuf *m_at, *mp_last;
4813
4814		mp_last = NULL;
4815		for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4816			if (SCTP_BUF_NEXT(m_at) == NULL)
4817				mp_last = m_at;
4818		}
4819		if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4820			sctp_m_freem(m);
4821			return;
4822		}
4823	}
4824	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4825	ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4826	    (struct sockaddr *)&net->ro._l_addr,
4827	    m, 0, NULL, 0, 0, 0, 0,
4828	    inp->sctp_lport, stcb->rport, htonl(0),
4829	    net->port, NULL,
4830	    0, 0,
4831	    so_locked);
4832	SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4833	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4834	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4835}
4836
4837struct mbuf *
4838sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4839    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4840{
4841	/*
4842	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4843	 * being equal to the beginning of the params i.e. (iphlen +
4844	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4845	 * end of the mbuf verifying that all parameters are known.
4846	 *
4847	 * For unknown parameters build and return a mbuf with
4848	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4849	 * processing this chunk stop, and set *abort_processing to 1.
4850	 *
4851	 * By having param_offset be pre-set to where parameters begin it is
4852	 * hoped that this routine may be reused in the future by new
4853	 * features.
4854	 */
4855	struct sctp_paramhdr *phdr, params;
4856
4857	struct mbuf *mat, *op_err;
4858	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4859	int at, limit, pad_needed;
4860	uint16_t ptype, plen, padded_size;
4861	int err_at;
4862
4863	*abort_processing = 0;
4864	mat = in_initpkt;
4865	err_at = 0;
4866	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4867	at = param_offset;
4868	op_err = NULL;
4869	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4870	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4871	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4872		ptype = ntohs(phdr->param_type);
4873		plen = ntohs(phdr->param_length);
4874		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4875			/* wacked parameter */
4876			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4877			goto invalid_size;
4878		}
4879		limit -= SCTP_SIZE32(plen);
4880		/*-
4881		 * All parameters for all chunks that we know/understand are
4882		 * listed here. We process them other places and make
4883		 * appropriate stop actions per the upper bits. However this
4884		 * is the generic routine processor's can call to get back
4885		 * an operr.. to either incorporate (init-ack) or send.
4886		 */
4887		padded_size = SCTP_SIZE32(plen);
4888		switch (ptype) {
4889			/* Param's with variable size */
4890		case SCTP_HEARTBEAT_INFO:
4891		case SCTP_STATE_COOKIE:
4892		case SCTP_UNRECOG_PARAM:
4893		case SCTP_ERROR_CAUSE_IND:
4894			/* ok skip fwd */
4895			at += padded_size;
4896			break;
4897			/* Param's with variable size within a range */
4898		case SCTP_CHUNK_LIST:
4899		case SCTP_SUPPORTED_CHUNK_EXT:
4900			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4901				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4902				goto invalid_size;
4903			}
4904			at += padded_size;
4905			break;
4906		case SCTP_SUPPORTED_ADDRTYPE:
4907			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4908				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4909				goto invalid_size;
4910			}
4911			at += padded_size;
4912			break;
4913		case SCTP_RANDOM:
4914			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4915				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4916				goto invalid_size;
4917			}
4918			at += padded_size;
4919			break;
4920		case SCTP_SET_PRIM_ADDR:
4921		case SCTP_DEL_IP_ADDRESS:
4922		case SCTP_ADD_IP_ADDRESS:
4923			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4924			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4925				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4926				goto invalid_size;
4927			}
4928			at += padded_size;
4929			break;
4930			/* Param's with a fixed size */
4931		case SCTP_IPV4_ADDRESS:
4932			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4933				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4934				goto invalid_size;
4935			}
4936			at += padded_size;
4937			break;
4938		case SCTP_IPV6_ADDRESS:
4939			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4940				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4941				goto invalid_size;
4942			}
4943			at += padded_size;
4944			break;
4945		case SCTP_COOKIE_PRESERVE:
4946			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4947				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4948				goto invalid_size;
4949			}
4950			at += padded_size;
4951			break;
4952		case SCTP_HAS_NAT_SUPPORT:
4953			*nat_friendly = 1;
4954			/* fall through */
4955		case SCTP_PRSCTP_SUPPORTED:
4956
4957			if (padded_size != sizeof(struct sctp_paramhdr)) {
4958				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4959				goto invalid_size;
4960			}
4961			at += padded_size;
4962			break;
4963		case SCTP_ECN_CAPABLE:
4964			if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4965				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4966				goto invalid_size;
4967			}
4968			at += padded_size;
4969			break;
4970		case SCTP_ULP_ADAPTATION:
4971			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4972				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4973				goto invalid_size;
4974			}
4975			at += padded_size;
4976			break;
4977		case SCTP_SUCCESS_REPORT:
4978			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4979				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4980				goto invalid_size;
4981			}
4982			at += padded_size;
4983			break;
4984		case SCTP_HOSTNAME_ADDRESS:
4985			{
4986				/* We can NOT handle HOST NAME addresses!! */
4987				int l_len;
4988
4989				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4990				*abort_processing = 1;
4991				if (op_err == NULL) {
4992					/* Ok need to try to get a mbuf */
4993#ifdef INET6
4994					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4995#else
4996					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4997#endif
4998					l_len += plen;
4999					l_len += sizeof(struct sctp_paramhdr);
5000					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5001					if (op_err) {
5002						SCTP_BUF_LEN(op_err) = 0;
5003						/*
5004						 * pre-reserve space for ip
5005						 * and sctp header  and
5006						 * chunk hdr
5007						 */
5008#ifdef INET6
5009						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5010#else
5011						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5012#endif
5013						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5014						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5015					}
5016				}
5017				if (op_err) {
5018					/* If we have space */
5019					struct sctp_paramhdr s;
5020
5021					if (err_at % 4) {
5022						uint32_t cpthis = 0;
5023
5024						pad_needed = 4 - (err_at % 4);
5025						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5026						err_at += pad_needed;
5027					}
5028					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5029					s.param_length = htons(sizeof(s) + plen);
5030					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5031					err_at += sizeof(s);
5032					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5033					if (phdr == NULL) {
5034						sctp_m_freem(op_err);
5035						/*
5036						 * we are out of memory but
5037						 * we still need to have a
5038						 * look at what to do (the
5039						 * system is in trouble
5040						 * though).
5041						 */
5042						return (NULL);
5043					}
5044					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5045				}
5046				return (op_err);
5047				break;
5048			}
5049		default:
5050			/*
5051			 * we do not recognize the parameter figure out what
5052			 * we do.
5053			 */
5054			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5055			if ((ptype & 0x4000) == 0x4000) {
5056				/* Report bit is set?? */
5057				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5058				if (op_err == NULL) {
5059					int l_len;
5060
5061					/* Ok need to try to get an mbuf */
5062#ifdef INET6
5063					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5064#else
5065					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5066#endif
5067					l_len += plen;
5068					l_len += sizeof(struct sctp_paramhdr);
5069					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5070					if (op_err) {
5071						SCTP_BUF_LEN(op_err) = 0;
5072#ifdef INET6
5073						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5074#else
5075						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5076#endif
5077						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5078						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5079					}
5080				}
5081				if (op_err) {
5082					/* If we have space */
5083					struct sctp_paramhdr s;
5084
5085					if (err_at % 4) {
5086						uint32_t cpthis = 0;
5087
5088						pad_needed = 4 - (err_at % 4);
5089						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5090						err_at += pad_needed;
5091					}
5092					s.param_type = htons(SCTP_UNRECOG_PARAM);
5093					s.param_length = htons(sizeof(s) + plen);
5094					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5095					err_at += sizeof(s);
5096					if (plen > sizeof(tempbuf)) {
5097						plen = sizeof(tempbuf);
5098					}
5099					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5100					if (phdr == NULL) {
5101						sctp_m_freem(op_err);
5102						/*
5103						 * we are out of memory but
5104						 * we still need to have a
5105						 * look at what to do (the
5106						 * system is in trouble
5107						 * though).
5108						 */
5109						op_err = NULL;
5110						goto more_processing;
5111					}
5112					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5113					err_at += plen;
5114				}
5115			}
5116	more_processing:
5117			if ((ptype & 0x8000) == 0x0000) {
5118				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5119				return (op_err);
5120			} else {
5121				/* skip this chunk and continue processing */
5122				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5123				at += SCTP_SIZE32(plen);
5124			}
5125			break;
5126
5127		}
5128		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5129	}
5130	return (op_err);
5131invalid_size:
5132	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5133	*abort_processing = 1;
5134	if ((op_err == NULL) && phdr) {
5135		int l_len;
5136
5137#ifdef INET6
5138		l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5139#else
5140		l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5141#endif
5142		l_len += (2 * sizeof(struct sctp_paramhdr));
5143		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5144		if (op_err) {
5145			SCTP_BUF_LEN(op_err) = 0;
5146#ifdef INET6
5147			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5148#else
5149			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5150#endif
5151			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5152			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5153		}
5154	}
5155	if ((op_err) && phdr) {
5156		struct sctp_paramhdr s;
5157
5158		if (err_at % 4) {
5159			uint32_t cpthis = 0;
5160
5161			pad_needed = 4 - (err_at % 4);
5162			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5163			err_at += pad_needed;
5164		}
5165		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5166		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5167		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5168		err_at += sizeof(s);
5169		/* Only copy back the p-hdr that caused the issue */
5170		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5171	}
5172	return (op_err);
5173}
5174
5175static int
5176sctp_are_there_new_addresses(struct sctp_association *asoc,
5177    struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5178{
5179	/*
5180	 * Given a INIT packet, look through the packet to verify that there
5181	 * are NO new addresses. As we go through the parameters add reports
5182	 * of any un-understood parameters that require an error.  Also we
5183	 * must return (1) to drop the packet if we see a un-understood
5184	 * parameter that tells us to drop the chunk.
5185	 */
5186	struct sockaddr *sa_touse;
5187	struct sockaddr *sa;
5188	struct sctp_paramhdr *phdr, params;
5189	uint16_t ptype, plen;
5190	uint8_t fnd;
5191	struct sctp_nets *net;
5192
5193#ifdef INET
5194	struct sockaddr_in sin4, *sa4;
5195
5196#endif
5197#ifdef INET6
5198	struct sockaddr_in6 sin6, *sa6;
5199
5200#endif
5201
5202#ifdef INET
5203	memset(&sin4, 0, sizeof(sin4));
5204	sin4.sin_family = AF_INET;
5205	sin4.sin_len = sizeof(sin4);
5206#endif
5207#ifdef INET6
5208	memset(&sin6, 0, sizeof(sin6));
5209	sin6.sin6_family = AF_INET6;
5210	sin6.sin6_len = sizeof(sin6);
5211#endif
5212	/* First what about the src address of the pkt ? */
5213	fnd = 0;
5214	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5215		sa = (struct sockaddr *)&net->ro._l_addr;
5216		if (sa->sa_family == src->sa_family) {
5217#ifdef INET
5218			if (sa->sa_family == AF_INET) {
5219				struct sockaddr_in *src4;
5220
5221				sa4 = (struct sockaddr_in *)sa;
5222				src4 = (struct sockaddr_in *)src;
5223				if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5224					fnd = 1;
5225					break;
5226				}
5227			}
5228#endif
5229#ifdef INET6
5230			if (sa->sa_family == AF_INET6) {
5231				struct sockaddr_in6 *src6;
5232
5233				sa6 = (struct sockaddr_in6 *)sa;
5234				src6 = (struct sockaddr_in6 *)src;
5235				if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5236					fnd = 1;
5237					break;
5238				}
5239			}
5240#endif
5241		}
5242	}
5243	if (fnd == 0) {
5244		/* New address added! no need to look futher. */
5245		return (1);
5246	}
5247	/* Ok so far lets munge through the rest of the packet */
5248	offset += sizeof(struct sctp_init_chunk);
5249	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5250	while (phdr) {
5251		sa_touse = NULL;
5252		ptype = ntohs(phdr->param_type);
5253		plen = ntohs(phdr->param_length);
5254		switch (ptype) {
5255#ifdef INET
5256		case SCTP_IPV4_ADDRESS:
5257			{
5258				struct sctp_ipv4addr_param *p4, p4_buf;
5259
5260				phdr = sctp_get_next_param(in_initpkt, offset,
5261				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5262				if (plen != sizeof(struct sctp_ipv4addr_param) ||
5263				    phdr == NULL) {
5264					return (1);
5265				}
5266				p4 = (struct sctp_ipv4addr_param *)phdr;
5267				sin4.sin_addr.s_addr = p4->addr;
5268				sa_touse = (struct sockaddr *)&sin4;
5269				break;
5270			}
5271#endif
5272#ifdef INET6
5273		case SCTP_IPV6_ADDRESS:
5274			{
5275				struct sctp_ipv6addr_param *p6, p6_buf;
5276
5277				phdr = sctp_get_next_param(in_initpkt, offset,
5278				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5279				if (plen != sizeof(struct sctp_ipv6addr_param) ||
5280				    phdr == NULL) {
5281					return (1);
5282				}
5283				p6 = (struct sctp_ipv6addr_param *)phdr;
5284				memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5285				    sizeof(p6->addr));
5286				sa_touse = (struct sockaddr *)&sin6;
5287				break;
5288			}
5289#endif
5290		default:
5291			sa_touse = NULL;
5292			break;
5293		}
5294		if (sa_touse) {
5295			/* ok, sa_touse points to one to check */
5296			fnd = 0;
5297			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5298				sa = (struct sockaddr *)&net->ro._l_addr;
5299				if (sa->sa_family != sa_touse->sa_family) {
5300					continue;
5301				}
5302#ifdef INET
5303				if (sa->sa_family == AF_INET) {
5304					sa4 = (struct sockaddr_in *)sa;
5305					if (sa4->sin_addr.s_addr ==
5306					    sin4.sin_addr.s_addr) {
5307						fnd = 1;
5308						break;
5309					}
5310				}
5311#endif
5312#ifdef INET6
5313				if (sa->sa_family == AF_INET6) {
5314					sa6 = (struct sockaddr_in6 *)sa;
5315					if (SCTP6_ARE_ADDR_EQUAL(
5316					    sa6, &sin6)) {
5317						fnd = 1;
5318						break;
5319					}
5320				}
5321#endif
5322			}
5323			if (!fnd) {
5324				/* New addr added! no need to look further */
5325				return (1);
5326			}
5327		}
5328		offset += SCTP_SIZE32(plen);
5329		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5330	}
5331	return (0);
5332}
5333
5334/*
5335 * Given a MBUF chain that was sent into us containing an INIT. Build a
5336 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5337 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5338 * message (i.e. the struct sctp_init_msg).
5339 */
5340void
5341sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5342    struct mbuf *init_pkt, int iphlen, int offset,
5343    struct sockaddr *src, struct sockaddr *dst,
5344    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5345    uint8_t use_mflowid, uint32_t mflowid,
5346    uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5347{
5348	struct sctp_association *asoc;
5349	struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5350	struct sctp_init_ack_chunk *initack;
5351	struct sctp_adaptation_layer_indication *ali;
5352	struct sctp_ecn_supported_param *ecn;
5353	struct sctp_prsctp_supported_param *prsctp;
5354	struct sctp_supported_chunk_types_param *pr_supported;
5355	union sctp_sockstore *over_addr;
5356
5357#ifdef INET
5358	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5359	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5360	struct sockaddr_in *sin;
5361
5362#endif
5363#ifdef INET6
5364	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5365	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5366	struct sockaddr_in6 *sin6;
5367
5368#endif
5369	struct sockaddr *to;
5370	struct sctp_state_cookie stc;
5371	struct sctp_nets *net = NULL;
5372	uint8_t *signature = NULL;
5373	int cnt_inits_to = 0;
5374	uint16_t his_limit, i_want;
5375	int abort_flag, padval;
5376	int num_ext;
5377	int p_len;
5378	int nat_friendly = 0;
5379	struct socket *so;
5380
5381	if (stcb) {
5382		asoc = &stcb->asoc;
5383	} else {
5384		asoc = NULL;
5385	}
5386	mp_last = NULL;
5387	if ((asoc != NULL) &&
5388	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5389	    (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5390		/* new addresses, out of here in non-cookie-wait states */
5391		/*
5392		 * Send a ABORT, we don't add the new address error clause
5393		 * though we even set the T bit and copy in the 0 tag.. this
5394		 * looks no different than if no listener was present.
5395		 */
5396		sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5397		    use_mflowid, mflowid,
5398		    vrf_id, port);
5399		return;
5400	}
5401	abort_flag = 0;
5402	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5403	    (offset + sizeof(struct sctp_init_chunk)),
5404	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5405	if (abort_flag) {
5406do_a_abort:
5407		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5408		    init_chk->init.initiate_tag, op_err,
5409		    use_mflowid, mflowid,
5410		    vrf_id, port);
5411		return;
5412	}
5413	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5414	if (m == NULL) {
5415		/* No memory, INIT timer will re-attempt. */
5416		if (op_err)
5417			sctp_m_freem(op_err);
5418		return;
5419	}
5420	SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5421
5422	/*
5423	 * We might not overwrite the identification[] completely and on
5424	 * some platforms time_entered will contain some padding. Therefore
5425	 * zero out the cookie to avoid putting uninitialized memory on the
5426	 * wire.
5427	 */
5428	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5429
5430	/* the time I built cookie */
5431	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5432
5433	/* populate any tie tags */
5434	if (asoc != NULL) {
5435		/* unlock before tag selections */
5436		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5437		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5438		stc.cookie_life = asoc->cookie_life;
5439		net = asoc->primary_destination;
5440	} else {
5441		stc.tie_tag_my_vtag = 0;
5442		stc.tie_tag_peer_vtag = 0;
5443		/* life I will award this cookie */
5444		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5445	}
5446
5447	/* copy in the ports for later check */
5448	stc.myport = sh->dest_port;
5449	stc.peerport = sh->src_port;
5450
5451	/*
5452	 * If we wanted to honor cookie life extentions, we would add to
5453	 * stc.cookie_life. For now we should NOT honor any extension
5454	 */
5455	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5456	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5457		stc.ipv6_addr_legal = 1;
5458		if (SCTP_IPV6_V6ONLY(inp)) {
5459			stc.ipv4_addr_legal = 0;
5460		} else {
5461			stc.ipv4_addr_legal = 1;
5462		}
5463	} else {
5464		stc.ipv6_addr_legal = 0;
5465		stc.ipv4_addr_legal = 1;
5466	}
5467#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5468	stc.ipv4_scope = 1;
5469#else
5470	stc.ipv4_scope = 0;
5471#endif
5472	if (net == NULL) {
5473		to = src;
5474		switch (dst->sa_family) {
5475#ifdef INET
5476		case AF_INET:
5477			{
5478				/* lookup address */
5479				stc.address[0] = src4->sin_addr.s_addr;
5480				stc.address[1] = 0;
5481				stc.address[2] = 0;
5482				stc.address[3] = 0;
5483				stc.addr_type = SCTP_IPV4_ADDRESS;
5484				/* local from address */
5485				stc.laddress[0] = dst4->sin_addr.s_addr;
5486				stc.laddress[1] = 0;
5487				stc.laddress[2] = 0;
5488				stc.laddress[3] = 0;
5489				stc.laddr_type = SCTP_IPV4_ADDRESS;
5490				/* scope_id is only for v6 */
5491				stc.scope_id = 0;
5492#ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5493				if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5494					stc.ipv4_scope = 1;
5495				}
5496#else
5497				stc.ipv4_scope = 1;
5498#endif				/* SCTP_DONT_DO_PRIVADDR_SCOPE */
5499				/* Must use the address in this case */
5500				if (sctp_is_address_on_local_host(src, vrf_id)) {
5501					stc.loopback_scope = 1;
5502					stc.ipv4_scope = 1;
5503					stc.site_scope = 1;
5504					stc.local_scope = 0;
5505				}
5506				break;
5507			}
5508#endif
5509#ifdef INET6
5510		case AF_INET6:
5511			{
5512				stc.addr_type = SCTP_IPV6_ADDRESS;
5513				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5514				stc.scope_id = in6_getscope(&src6->sin6_addr);
5515				if (sctp_is_address_on_local_host(src, vrf_id)) {
5516					stc.loopback_scope = 1;
5517					stc.local_scope = 0;
5518					stc.site_scope = 1;
5519					stc.ipv4_scope = 1;
5520				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5521					/*
5522					 * If the new destination is a
5523					 * LINK_LOCAL we must have common
5524					 * both site and local scope. Don't
5525					 * set local scope though since we
5526					 * must depend on the source to be
5527					 * added implicitly. We cannot
5528					 * assure just because we share one
5529					 * link that all links are common.
5530					 */
5531					stc.local_scope = 0;
5532					stc.site_scope = 1;
5533					stc.ipv4_scope = 1;
5534					/*
5535					 * we start counting for the private
5536					 * address stuff at 1. since the
5537					 * link local we source from won't
5538					 * show up in our scoped count.
5539					 */
5540					cnt_inits_to = 1;
5541					/*
5542					 * pull out the scope_id from
5543					 * incoming pkt
5544					 */
5545				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5546					/*
5547					 * If the new destination is
5548					 * SITE_LOCAL then we must have site
5549					 * scope in common.
5550					 */
5551					stc.site_scope = 1;
5552				}
5553				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5554				stc.laddr_type = SCTP_IPV6_ADDRESS;
5555				break;
5556			}
5557#endif
5558		default:
5559			/* TSNH */
5560			goto do_a_abort;
5561			break;
5562		}
5563	} else {
5564		/* set the scope per the existing tcb */
5565
5566#ifdef INET6
5567		struct sctp_nets *lnet;
5568
5569#endif
5570
5571		stc.loopback_scope = asoc->scope.loopback_scope;
5572		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5573		stc.site_scope = asoc->scope.site_scope;
5574		stc.local_scope = asoc->scope.local_scope;
5575#ifdef INET6
5576		/* Why do we not consider IPv4 LL addresses? */
5577		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5578			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5579				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5580					/*
5581					 * if we have a LL address, start
5582					 * counting at 1.
5583					 */
5584					cnt_inits_to = 1;
5585				}
5586			}
5587		}
5588#endif
5589		/* use the net pointer */
5590		to = (struct sockaddr *)&net->ro._l_addr;
5591		switch (to->sa_family) {
5592#ifdef INET
5593		case AF_INET:
5594			sin = (struct sockaddr_in *)to;
5595			stc.address[0] = sin->sin_addr.s_addr;
5596			stc.address[1] = 0;
5597			stc.address[2] = 0;
5598			stc.address[3] = 0;
5599			stc.addr_type = SCTP_IPV4_ADDRESS;
5600			if (net->src_addr_selected == 0) {
5601				/*
5602				 * strange case here, the INIT should have
5603				 * did the selection.
5604				 */
5605				net->ro._s_addr = sctp_source_address_selection(inp,
5606				    stcb, (sctp_route_t *) & net->ro,
5607				    net, 0, vrf_id);
5608				if (net->ro._s_addr == NULL)
5609					return;
5610
5611				net->src_addr_selected = 1;
5612
5613			}
5614			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5615			stc.laddress[1] = 0;
5616			stc.laddress[2] = 0;
5617			stc.laddress[3] = 0;
5618			stc.laddr_type = SCTP_IPV4_ADDRESS;
5619			/* scope_id is only for v6 */
5620			stc.scope_id = 0;
5621			break;
5622#endif
5623#ifdef INET6
5624		case AF_INET6:
5625			sin6 = (struct sockaddr_in6 *)to;
5626			memcpy(&stc.address, &sin6->sin6_addr,
5627			    sizeof(struct in6_addr));
5628			stc.addr_type = SCTP_IPV6_ADDRESS;
5629			stc.scope_id = sin6->sin6_scope_id;
5630			if (net->src_addr_selected == 0) {
5631				/*
5632				 * strange case here, the INIT should have
5633				 * done the selection.
5634				 */
5635				net->ro._s_addr = sctp_source_address_selection(inp,
5636				    stcb, (sctp_route_t *) & net->ro,
5637				    net, 0, vrf_id);
5638				if (net->ro._s_addr == NULL)
5639					return;
5640
5641				net->src_addr_selected = 1;
5642			}
5643			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5644			    sizeof(struct in6_addr));
5645			stc.laddr_type = SCTP_IPV6_ADDRESS;
5646			break;
5647#endif
5648		}
5649	}
5650	/* Now lets put the SCTP header in place */
5651	initack = mtod(m, struct sctp_init_ack_chunk *);
5652	/* Save it off for quick ref */
5653	stc.peers_vtag = init_chk->init.initiate_tag;
5654	/* who are we */
5655	memcpy(stc.identification, SCTP_VERSION_STRING,
5656	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5657	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5658	/* now the chunk header */
5659	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5660	initack->ch.chunk_flags = 0;
5661	/* fill in later from mbuf we build */
5662	initack->ch.chunk_length = 0;
5663	/* place in my tag */
5664	if ((asoc != NULL) &&
5665	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5666	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5667	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5668		/* re-use the v-tags and init-seq here */
5669		initack->init.initiate_tag = htonl(asoc->my_vtag);
5670		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5671	} else {
5672		uint32_t vtag, itsn;
5673
5674		if (hold_inp_lock) {
5675			SCTP_INP_INCR_REF(inp);
5676			SCTP_INP_RUNLOCK(inp);
5677		}
5678		if (asoc) {
5679			atomic_add_int(&asoc->refcnt, 1);
5680			SCTP_TCB_UNLOCK(stcb);
5681	new_tag:
5682			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5683			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5684				/*
5685				 * Got a duplicate vtag on some guy behind a
5686				 * nat make sure we don't use it.
5687				 */
5688				goto new_tag;
5689			}
5690			initack->init.initiate_tag = htonl(vtag);
5691			/* get a TSN to use too */
5692			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5693			initack->init.initial_tsn = htonl(itsn);
5694			SCTP_TCB_LOCK(stcb);
5695			atomic_add_int(&asoc->refcnt, -1);
5696		} else {
5697			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5698			initack->init.initiate_tag = htonl(vtag);
5699			/* get a TSN to use too */
5700			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5701		}
5702		if (hold_inp_lock) {
5703			SCTP_INP_RLOCK(inp);
5704			SCTP_INP_DECR_REF(inp);
5705		}
5706	}
5707	/* save away my tag to */
5708	stc.my_vtag = initack->init.initiate_tag;
5709
5710	/* set up some of the credits. */
5711	so = inp->sctp_socket;
5712	if (so == NULL) {
5713		/* memory problem */
5714		sctp_m_freem(m);
5715		return;
5716	} else {
5717		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5718	}
5719	/* set what I want */
5720	his_limit = ntohs(init_chk->init.num_inbound_streams);
5721	/* choose what I want */
5722	if (asoc != NULL) {
5723		if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5724			i_want = asoc->streamoutcnt;
5725		} else {
5726			i_want = inp->sctp_ep.pre_open_stream_count;
5727		}
5728	} else {
5729		i_want = inp->sctp_ep.pre_open_stream_count;
5730	}
5731	if (his_limit < i_want) {
5732		/* I Want more :< */
5733		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5734	} else {
5735		/* I can have what I want :> */
5736		initack->init.num_outbound_streams = htons(i_want);
5737	}
5738	/* tell him his limit. */
5739	initack->init.num_inbound_streams =
5740	    htons(inp->sctp_ep.max_open_streams_intome);
5741
5742	/* adaptation layer indication parameter */
5743	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5744		ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5745		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5746		ali->ph.param_length = htons(sizeof(*ali));
5747		ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5748		SCTP_BUF_LEN(m) += sizeof(*ali);
5749		ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5750	} else {
5751		ecn = (struct sctp_ecn_supported_param *)((caddr_t)initack + sizeof(*initack));
5752	}
5753
5754	/* ECN parameter */
5755	if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5756	    (inp->sctp_ecn_enable == 1)) {
5757		ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5758		ecn->ph.param_length = htons(sizeof(*ecn));
5759		SCTP_BUF_LEN(m) += sizeof(*ecn);
5760
5761		prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5762		    sizeof(*ecn));
5763	} else {
5764		prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5765	}
5766	/* And now tell the peer we do  pr-sctp */
5767	prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5768	prsctp->ph.param_length = htons(sizeof(*prsctp));
5769	SCTP_BUF_LEN(m) += sizeof(*prsctp);
5770	if (nat_friendly) {
5771		/* Add NAT friendly parameter */
5772		struct sctp_paramhdr *ph;
5773
5774		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5775		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5776		ph->param_length = htons(sizeof(struct sctp_paramhdr));
5777		SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5778	}
5779	/* And now tell the peer we do all the extensions */
5780	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5781	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5782	num_ext = 0;
5783	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5784	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5785	pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5786	pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5787	pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5788	if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5789		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5790	if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5791		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5792	p_len = sizeof(*pr_supported) + num_ext;
5793	pr_supported->ph.param_length = htons(p_len);
5794	bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5795	SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5796
5797	/* add authentication parameters */
5798	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5799		struct sctp_auth_random *randp;
5800		struct sctp_auth_hmac_algo *hmacs;
5801		struct sctp_auth_chunk_list *chunks;
5802		uint16_t random_len;
5803
5804		/* generate and add RANDOM parameter */
5805		random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5806		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5807		randp->ph.param_type = htons(SCTP_RANDOM);
5808		p_len = sizeof(*randp) + random_len;
5809		randp->ph.param_length = htons(p_len);
5810		SCTP_READ_RANDOM(randp->random_data, random_len);
5811		/* zero out any padding required */
5812		bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5813		SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5814
5815		/* add HMAC_ALGO parameter */
5816		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5817		p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5818		    (uint8_t *) hmacs->hmac_ids);
5819		if (p_len > 0) {
5820			p_len += sizeof(*hmacs);
5821			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5822			hmacs->ph.param_length = htons(p_len);
5823			/* zero out any padding required */
5824			bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5825			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5826		}
5827		/* add CHUNKS parameter */
5828		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5829		p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5830		    chunks->chunk_types);
5831		if (p_len > 0) {
5832			p_len += sizeof(*chunks);
5833			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5834			chunks->ph.param_length = htons(p_len);
5835			/* zero out any padding required */
5836			bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5837			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5838		}
5839	}
5840	m_at = m;
5841	/* now the addresses */
5842	{
5843		struct sctp_scoping scp;
5844
5845		/*
5846		 * To optimize this we could put the scoping stuff into a
5847		 * structure and remove the individual uint8's from the stc
5848		 * structure. Then we could just sifa in the address within
5849		 * the stc.. but for now this is a quick hack to get the
5850		 * address stuff teased apart.
5851		 */
5852		scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5853		scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5854		scp.loopback_scope = stc.loopback_scope;
5855		scp.ipv4_local_scope = stc.ipv4_scope;
5856		scp.local_scope = stc.local_scope;
5857		scp.site_scope = stc.site_scope;
5858		m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
5859	}
5860
5861	/* tack on the operational error if present */
5862	if (op_err) {
5863		struct mbuf *ol;
5864		int llen;
5865
5866		llen = 0;
5867		ol = op_err;
5868
5869		while (ol) {
5870			llen += SCTP_BUF_LEN(ol);
5871			ol = SCTP_BUF_NEXT(ol);
5872		}
5873		if (llen % 4) {
5874			/* must add a pad to the param */
5875			uint32_t cpthis = 0;
5876			int padlen;
5877
5878			padlen = 4 - (llen % 4);
5879			m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5880		}
5881		while (SCTP_BUF_NEXT(m_at) != NULL) {
5882			m_at = SCTP_BUF_NEXT(m_at);
5883		}
5884		SCTP_BUF_NEXT(m_at) = op_err;
5885		while (SCTP_BUF_NEXT(m_at) != NULL) {
5886			m_at = SCTP_BUF_NEXT(m_at);
5887		}
5888	}
5889	/* pre-calulate the size and update pkt header and chunk header */
5890	p_len = 0;
5891	for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5892		p_len += SCTP_BUF_LEN(m_tmp);
5893		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5894			/* m_tmp should now point to last one */
5895			break;
5896		}
5897	}
5898
5899	/* Now we must build a cookie */
5900	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5901	if (m_cookie == NULL) {
5902		/* memory problem */
5903		sctp_m_freem(m);
5904		return;
5905	}
5906	/* Now append the cookie to the end and update the space/size */
5907	SCTP_BUF_NEXT(m_tmp) = m_cookie;
5908
5909	for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5910		p_len += SCTP_BUF_LEN(m_tmp);
5911		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5912			/* m_tmp should now point to last one */
5913			mp_last = m_tmp;
5914			break;
5915		}
5916	}
5917	/*
5918	 * Place in the size, but we don't include the last pad (if any) in
5919	 * the INIT-ACK.
5920	 */
5921	initack->ch.chunk_length = htons(p_len);
5922
5923	/*
5924	 * Time to sign the cookie, we don't sign over the cookie signature
5925	 * though thus we set trailer.
5926	 */
5927	(void)sctp_hmac_m(SCTP_HMAC,
5928	    (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5929	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5930	    (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5931	/*
5932	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5933	 * here since the timer will drive a retranmission.
5934	 */
5935	padval = p_len % 4;
5936	if ((padval) && (mp_last)) {
5937		/* see my previous comments on mp_last */
5938		if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5939			/* Houston we have a problem, no space */
5940			sctp_m_freem(m);
5941			return;
5942		}
5943	}
5944	if (stc.loopback_scope) {
5945		over_addr = (union sctp_sockstore *)dst;
5946	} else {
5947		over_addr = NULL;
5948	}
5949
5950	(void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5951	    0, 0,
5952	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5953	    port, over_addr,
5954	    use_mflowid, mflowid,
5955	    SCTP_SO_NOT_LOCKED);
5956	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5957}
5958
5959
5960static void
5961sctp_prune_prsctp(struct sctp_tcb *stcb,
5962    struct sctp_association *asoc,
5963    struct sctp_sndrcvinfo *srcv,
5964    int dataout)
5965{
5966	int freed_spc = 0;
5967	struct sctp_tmit_chunk *chk, *nchk;
5968
5969	SCTP_TCB_LOCK_ASSERT(stcb);
5970	if ((asoc->peer_supports_prsctp) &&
5971	    (asoc->sent_queue_cnt_removeable > 0)) {
5972		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5973			/*
5974			 * Look for chunks marked with the PR_SCTP flag AND
5975			 * the buffer space flag. If the one being sent is
5976			 * equal or greater priority then purge the old one
5977			 * and free some space.
5978			 */
5979			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5980				/*
5981				 * This one is PR-SCTP AND buffer space
5982				 * limited type
5983				 */
5984				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5985					/*
5986					 * Lower numbers equates to higher
5987					 * priority so if the one we are
5988					 * looking at has a larger or equal
5989					 * priority we want to drop the data
5990					 * and NOT retransmit it.
5991					 */
5992					if (chk->data) {
5993						/*
5994						 * We release the book_size
5995						 * if the mbuf is here
5996						 */
5997						int ret_spc;
5998						uint8_t sent;
5999
6000						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6001							sent = 1;
6002						else
6003							sent = 0;
6004						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6005						    sent,
6006						    SCTP_SO_LOCKED);
6007						freed_spc += ret_spc;
6008						if (freed_spc >= dataout) {
6009							return;
6010						}
6011					}	/* if chunk was present */
6012				}	/* if of sufficent priority */
6013			}	/* if chunk has enabled */
6014		}		/* tailqforeach */
6015
6016		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6017			/* Here we must move to the sent queue and mark */
6018			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6019				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6020					if (chk->data) {
6021						/*
6022						 * We release the book_size
6023						 * if the mbuf is here
6024						 */
6025						int ret_spc;
6026
6027						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6028						    0, SCTP_SO_LOCKED);
6029
6030						freed_spc += ret_spc;
6031						if (freed_spc >= dataout) {
6032							return;
6033						}
6034					}	/* end if chk->data */
6035				}	/* end if right class */
6036			}	/* end if chk pr-sctp */
6037		}		/* tailqforeachsafe (chk) */
6038	}			/* if enabled in asoc */
6039}
6040
6041int
6042sctp_get_frag_point(struct sctp_tcb *stcb,
6043    struct sctp_association *asoc)
6044{
6045	int siz, ovh;
6046
6047	/*
6048	 * For endpoints that have both v6 and v4 addresses we must reserve
6049	 * room for the ipv6 header, for those that are only dealing with V4
6050	 * we use a larger frag point.
6051	 */
6052	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6053		ovh = SCTP_MED_OVERHEAD;
6054	} else {
6055		ovh = SCTP_MED_V4_OVERHEAD;
6056	}
6057
6058	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6059		siz = asoc->smallest_mtu - ovh;
6060	else
6061		siz = (stcb->asoc.sctp_frag_point - ovh);
6062	/*
6063	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6064	 */
6065	/* A data chunk MUST fit in a cluster */
6066	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6067	/* } */
6068
6069	/* adjust for an AUTH chunk if DATA requires auth */
6070	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6071		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6072
6073	if (siz % 4) {
6074		/* make it an even word boundary please */
6075		siz -= (siz % 4);
6076	}
6077	return (siz);
6078}
6079
6080static void
6081sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6082{
6083	/*
6084	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6085	 * positive lifetime but does not specify any PR_SCTP policy.
6086	 */
6087	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6088		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6089	} else if (sp->timetolive > 0) {
6090		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6091		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6092	} else {
6093		return;
6094	}
6095	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6096	case CHUNK_FLAGS_PR_SCTP_BUF:
6097		/*
6098		 * Time to live is a priority stored in tv_sec when doing
6099		 * the buffer drop thing.
6100		 */
6101		sp->ts.tv_sec = sp->timetolive;
6102		sp->ts.tv_usec = 0;
6103		break;
6104	case CHUNK_FLAGS_PR_SCTP_TTL:
6105		{
6106			struct timeval tv;
6107
6108			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6109			tv.tv_sec = sp->timetolive / 1000;
6110			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6111			/*
6112			 * TODO sctp_constants.h needs alternative time
6113			 * macros when _KERNEL is undefined.
6114			 */
6115			timevaladd(&sp->ts, &tv);
6116		}
6117		break;
6118	case CHUNK_FLAGS_PR_SCTP_RTX:
6119		/*
6120		 * Time to live is a the number or retransmissions stored in
6121		 * tv_sec.
6122		 */
6123		sp->ts.tv_sec = sp->timetolive;
6124		sp->ts.tv_usec = 0;
6125		break;
6126	default:
6127		SCTPDBG(SCTP_DEBUG_USRREQ1,
6128		    "Unknown PR_SCTP policy %u.\n",
6129		    PR_SCTP_POLICY(sp->sinfo_flags));
6130		break;
6131	}
6132}
6133
6134static int
6135sctp_msg_append(struct sctp_tcb *stcb,
6136    struct sctp_nets *net,
6137    struct mbuf *m,
6138    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6139{
6140	int error = 0;
6141	struct mbuf *at;
6142	struct sctp_stream_queue_pending *sp = NULL;
6143	struct sctp_stream_out *strm;
6144
6145	/*
6146	 * Given an mbuf chain, put it into the association send queue and
6147	 * place it on the wheel
6148	 */
6149	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6150		/* Invalid stream number */
6151		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6152		error = EINVAL;
6153		goto out_now;
6154	}
6155	if ((stcb->asoc.stream_locked) &&
6156	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6157		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6158		error = EINVAL;
6159		goto out_now;
6160	}
6161	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6162	/* Now can we send this? */
6163	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6164	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6165	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6166	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6167		/* got data while shutting down */
6168		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6169		error = ECONNRESET;
6170		goto out_now;
6171	}
6172	sctp_alloc_a_strmoq(stcb, sp);
6173	if (sp == NULL) {
6174		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6175		error = ENOMEM;
6176		goto out_now;
6177	}
6178	sp->sinfo_flags = srcv->sinfo_flags;
6179	sp->timetolive = srcv->sinfo_timetolive;
6180	sp->ppid = srcv->sinfo_ppid;
6181	sp->context = srcv->sinfo_context;
6182	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6183		sp->net = net;
6184		atomic_add_int(&sp->net->ref_count, 1);
6185	} else {
6186		sp->net = NULL;
6187	}
6188	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6189	sp->stream = srcv->sinfo_stream;
6190	sp->msg_is_complete = 1;
6191	sp->sender_all_done = 1;
6192	sp->some_taken = 0;
6193	sp->data = m;
6194	sp->tail_mbuf = NULL;
6195	sctp_set_prsctp_policy(sp);
6196	/*
6197	 * We could in theory (for sendall) sifa the length in, but we would
6198	 * still have to hunt through the chain since we need to setup the
6199	 * tail_mbuf
6200	 */
6201	sp->length = 0;
6202	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6203		if (SCTP_BUF_NEXT(at) == NULL)
6204			sp->tail_mbuf = at;
6205		sp->length += SCTP_BUF_LEN(at);
6206	}
6207	if (srcv->sinfo_keynumber_valid) {
6208		sp->auth_keyid = srcv->sinfo_keynumber;
6209	} else {
6210		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6211	}
6212	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6213		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6214		sp->holds_key_ref = 1;
6215	}
6216	if (hold_stcb_lock == 0) {
6217		SCTP_TCB_SEND_LOCK(stcb);
6218	}
6219	sctp_snd_sb_alloc(stcb, sp->length);
6220	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6221	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6222	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6223	m = NULL;
6224	if (hold_stcb_lock == 0) {
6225		SCTP_TCB_SEND_UNLOCK(stcb);
6226	}
6227out_now:
6228	if (m) {
6229		sctp_m_freem(m);
6230	}
6231	return (error);
6232}
6233
6234
6235static struct mbuf *
6236sctp_copy_mbufchain(struct mbuf *clonechain,
6237    struct mbuf *outchain,
6238    struct mbuf **endofchain,
6239    int can_take_mbuf,
6240    int sizeofcpy,
6241    uint8_t copy_by_ref)
6242{
6243	struct mbuf *m;
6244	struct mbuf *appendchain;
6245	caddr_t cp;
6246	int len;
6247
6248	if (endofchain == NULL) {
6249		/* error */
6250error_out:
6251		if (outchain)
6252			sctp_m_freem(outchain);
6253		return (NULL);
6254	}
6255	if (can_take_mbuf) {
6256		appendchain = clonechain;
6257	} else {
6258		if (!copy_by_ref &&
6259		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6260		    ) {
6261			/* Its not in a cluster */
6262			if (*endofchain == NULL) {
6263				/* lets get a mbuf cluster */
6264				if (outchain == NULL) {
6265					/* This is the general case */
6266			new_mbuf:
6267					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6268					if (outchain == NULL) {
6269						goto error_out;
6270					}
6271					SCTP_BUF_LEN(outchain) = 0;
6272					*endofchain = outchain;
6273					/* get the prepend space */
6274					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6275				} else {
6276					/*
6277					 * We really should not get a NULL
6278					 * in endofchain
6279					 */
6280					/* find end */
6281					m = outchain;
6282					while (m) {
6283						if (SCTP_BUF_NEXT(m) == NULL) {
6284							*endofchain = m;
6285							break;
6286						}
6287						m = SCTP_BUF_NEXT(m);
6288					}
6289					/* sanity */
6290					if (*endofchain == NULL) {
6291						/*
6292						 * huh, TSNH XXX maybe we
6293						 * should panic
6294						 */
6295						sctp_m_freem(outchain);
6296						goto new_mbuf;
6297					}
6298				}
6299				/* get the new end of length */
6300				len = M_TRAILINGSPACE(*endofchain);
6301			} else {
6302				/* how much is left at the end? */
6303				len = M_TRAILINGSPACE(*endofchain);
6304			}
6305			/* Find the end of the data, for appending */
6306			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6307
6308			/* Now lets copy it out */
6309			if (len >= sizeofcpy) {
6310				/* It all fits, copy it in */
6311				m_copydata(clonechain, 0, sizeofcpy, cp);
6312				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6313			} else {
6314				/* fill up the end of the chain */
6315				if (len > 0) {
6316					m_copydata(clonechain, 0, len, cp);
6317					SCTP_BUF_LEN((*endofchain)) += len;
6318					/* now we need another one */
6319					sizeofcpy -= len;
6320				}
6321				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6322				if (m == NULL) {
6323					/* We failed */
6324					goto error_out;
6325				}
6326				SCTP_BUF_NEXT((*endofchain)) = m;
6327				*endofchain = m;
6328				cp = mtod((*endofchain), caddr_t);
6329				m_copydata(clonechain, len, sizeofcpy, cp);
6330				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6331			}
6332			return (outchain);
6333		} else {
6334			/* copy the old fashion way */
6335			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6336#ifdef SCTP_MBUF_LOGGING
6337			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6338				struct mbuf *mat;
6339
6340				for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6341					if (SCTP_BUF_IS_EXTENDED(mat)) {
6342						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6343					}
6344				}
6345			}
6346#endif
6347		}
6348	}
6349	if (appendchain == NULL) {
6350		/* error */
6351		if (outchain)
6352			sctp_m_freem(outchain);
6353		return (NULL);
6354	}
6355	if (outchain) {
6356		/* tack on to the end */
6357		if (*endofchain != NULL) {
6358			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6359		} else {
6360			m = outchain;
6361			while (m) {
6362				if (SCTP_BUF_NEXT(m) == NULL) {
6363					SCTP_BUF_NEXT(m) = appendchain;
6364					break;
6365				}
6366				m = SCTP_BUF_NEXT(m);
6367			}
6368		}
6369		/*
6370		 * save off the end and update the end-chain postion
6371		 */
6372		m = appendchain;
6373		while (m) {
6374			if (SCTP_BUF_NEXT(m) == NULL) {
6375				*endofchain = m;
6376				break;
6377			}
6378			m = SCTP_BUF_NEXT(m);
6379		}
6380		return (outchain);
6381	} else {
6382		/* save off the end and update the end-chain postion */
6383		m = appendchain;
6384		while (m) {
6385			if (SCTP_BUF_NEXT(m) == NULL) {
6386				*endofchain = m;
6387				break;
6388			}
6389			m = SCTP_BUF_NEXT(m);
6390		}
6391		return (appendchain);
6392	}
6393}
6394
6395static int
6396sctp_med_chunk_output(struct sctp_inpcb *inp,
6397    struct sctp_tcb *stcb,
6398    struct sctp_association *asoc,
6399    int *num_out,
6400    int *reason_code,
6401    int control_only, int from_where,
6402    struct timeval *now, int *now_filled, int frag_point, int so_locked
6403#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6404    SCTP_UNUSED
6405#endif
6406);
6407
6408static void
6409sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6410    uint32_t val SCTP_UNUSED)
6411{
6412	struct sctp_copy_all *ca;
6413	struct mbuf *m;
6414	int ret = 0;
6415	int added_control = 0;
6416	int un_sent, do_chunk_output = 1;
6417	struct sctp_association *asoc;
6418	struct sctp_nets *net;
6419
6420	ca = (struct sctp_copy_all *)ptr;
6421	if (ca->m == NULL) {
6422		return;
6423	}
6424	if (ca->inp != inp) {
6425		/* TSNH */
6426		return;
6427	}
6428	if (ca->sndlen > 0) {
6429		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6430		if (m == NULL) {
6431			/* can't copy so we are done */
6432			ca->cnt_failed++;
6433			return;
6434		}
6435#ifdef SCTP_MBUF_LOGGING
6436		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6437			struct mbuf *mat;
6438
6439			for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6440				if (SCTP_BUF_IS_EXTENDED(mat)) {
6441					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6442				}
6443			}
6444		}
6445#endif
6446	} else {
6447		m = NULL;
6448	}
6449	SCTP_TCB_LOCK_ASSERT(stcb);
6450	if (stcb->asoc.alternate) {
6451		net = stcb->asoc.alternate;
6452	} else {
6453		net = stcb->asoc.primary_destination;
6454	}
6455	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6456		/* Abort this assoc with m as the user defined reason */
6457		if (m != NULL) {
6458			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6459		} else {
6460			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6461			    0, M_NOWAIT, 1, MT_DATA);
6462			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6463		}
6464		if (m != NULL) {
6465			struct sctp_paramhdr *ph;
6466
6467			ph = mtod(m, struct sctp_paramhdr *);
6468			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6469			ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6470		}
6471		/*
6472		 * We add one here to keep the assoc from dis-appearing on
6473		 * us.
6474		 */
6475		atomic_add_int(&stcb->asoc.refcnt, 1);
6476		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6477		/*
6478		 * sctp_abort_an_association calls sctp_free_asoc() free
6479		 * association will NOT free it since we incremented the
6480		 * refcnt .. we do this to prevent it being freed and things
6481		 * getting tricky since we could end up (from free_asoc)
6482		 * calling inpcb_free which would get a recursive lock call
6483		 * to the iterator lock.. But as a consequence of that the
6484		 * stcb will return to us un-locked.. since free_asoc
6485		 * returns with either no TCB or the TCB unlocked, we must
6486		 * relock.. to unlock in the iterator timer :-0
6487		 */
6488		SCTP_TCB_LOCK(stcb);
6489		atomic_add_int(&stcb->asoc.refcnt, -1);
6490		goto no_chunk_output;
6491	} else {
6492		if (m) {
6493			ret = sctp_msg_append(stcb, net, m,
6494			    &ca->sndrcv, 1);
6495		}
6496		asoc = &stcb->asoc;
6497		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6498			/* shutdown this assoc */
6499			int cnt;
6500
6501			cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6502
6503			if (TAILQ_EMPTY(&asoc->send_queue) &&
6504			    TAILQ_EMPTY(&asoc->sent_queue) &&
6505			    (cnt == 0)) {
6506				if (asoc->locked_on_sending) {
6507					goto abort_anyway;
6508				}
6509				/*
6510				 * there is nothing queued to send, so I'm
6511				 * done...
6512				 */
6513				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6514				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6515				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6516					/*
6517					 * only send SHUTDOWN the first time
6518					 * through
6519					 */
6520					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6521						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6522					}
6523					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6524					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6525					sctp_stop_timers_for_shutdown(stcb);
6526					sctp_send_shutdown(stcb, net);
6527					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6528					    net);
6529					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6530					    asoc->primary_destination);
6531					added_control = 1;
6532					do_chunk_output = 0;
6533				}
6534			} else {
6535				/*
6536				 * we still got (or just got) data to send,
6537				 * so set SHUTDOWN_PENDING
6538				 */
6539				/*
6540				 * XXX sockets draft says that SCTP_EOF
6541				 * should be sent with no data.  currently,
6542				 * we will allow user data to be sent first
6543				 * and move to SHUTDOWN-PENDING
6544				 */
6545				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6546				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6547				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6548					if (asoc->locked_on_sending) {
6549						/*
6550						 * Locked to send out the
6551						 * data
6552						 */
6553						struct sctp_stream_queue_pending *sp;
6554
6555						sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6556						if (sp) {
6557							if ((sp->length == 0) && (sp->msg_is_complete == 0))
6558								asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6559						}
6560					}
6561					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6562					if (TAILQ_EMPTY(&asoc->send_queue) &&
6563					    TAILQ_EMPTY(&asoc->sent_queue) &&
6564					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6565				abort_anyway:
6566						atomic_add_int(&stcb->asoc.refcnt, 1);
6567						sctp_abort_an_association(stcb->sctp_ep, stcb,
6568						    NULL, SCTP_SO_NOT_LOCKED);
6569						atomic_add_int(&stcb->asoc.refcnt, -1);
6570						goto no_chunk_output;
6571					}
6572					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6573					    asoc->primary_destination);
6574				}
6575			}
6576
6577		}
6578	}
6579	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6580	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6581
6582	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6583	    (stcb->asoc.total_flight > 0) &&
6584	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6585		do_chunk_output = 0;
6586	}
6587	if (do_chunk_output)
6588		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6589	else if (added_control) {
6590		int num_out = 0, reason = 0, now_filled = 0;
6591		struct timeval now;
6592		int frag_point;
6593
6594		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6595		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6596		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6597	}
6598no_chunk_output:
6599	if (ret) {
6600		ca->cnt_failed++;
6601	} else {
6602		ca->cnt_sent++;
6603	}
6604}
6605
6606static void
6607sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6608{
6609	struct sctp_copy_all *ca;
6610
6611	ca = (struct sctp_copy_all *)ptr;
6612	/*
6613	 * Do a notify here? Kacheong suggests that the notify be done at
6614	 * the send time.. so you would push up a notification if any send
6615	 * failed. Don't know if this is feasable since the only failures we
6616	 * have is "memory" related and if you cannot get an mbuf to send
6617	 * the data you surely can't get an mbuf to send up to notify the
6618	 * user you can't send the data :->
6619	 */
6620
6621	/* now free everything */
6622	sctp_m_freem(ca->m);
6623	SCTP_FREE(ca, SCTP_M_COPYAL);
6624}
6625
6626
6627#define	MC_ALIGN(m, len) do {						\
6628	SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1));	\
6629} while (0)
6630
6631
6632
6633static struct mbuf *
6634sctp_copy_out_all(struct uio *uio, int len)
6635{
6636	struct mbuf *ret, *at;
6637	int left, willcpy, cancpy, error;
6638
6639	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6640	if (ret == NULL) {
6641		/* TSNH */
6642		return (NULL);
6643	}
6644	left = len;
6645	SCTP_BUF_LEN(ret) = 0;
6646	/* save space for the data chunk header */
6647	cancpy = M_TRAILINGSPACE(ret);
6648	willcpy = min(cancpy, left);
6649	at = ret;
6650	while (left > 0) {
6651		/* Align data to the end */
6652		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6653		if (error) {
6654	err_out_now:
6655			sctp_m_freem(at);
6656			return (NULL);
6657		}
6658		SCTP_BUF_LEN(at) = willcpy;
6659		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6660		left -= willcpy;
6661		if (left > 0) {
6662			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6663			if (SCTP_BUF_NEXT(at) == NULL) {
6664				goto err_out_now;
6665			}
6666			at = SCTP_BUF_NEXT(at);
6667			SCTP_BUF_LEN(at) = 0;
6668			cancpy = M_TRAILINGSPACE(at);
6669			willcpy = min(cancpy, left);
6670		}
6671	}
6672	return (ret);
6673}
6674
6675static int
6676sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6677    struct sctp_sndrcvinfo *srcv)
6678{
6679	int ret;
6680	struct sctp_copy_all *ca;
6681
6682	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6683	    SCTP_M_COPYAL);
6684	if (ca == NULL) {
6685		sctp_m_freem(m);
6686		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6687		return (ENOMEM);
6688	}
6689	memset(ca, 0, sizeof(struct sctp_copy_all));
6690
6691	ca->inp = inp;
6692	if (srcv) {
6693		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6694	}
6695	/*
6696	 * take off the sendall flag, it would be bad if we failed to do
6697	 * this :-0
6698	 */
6699	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6700	/* get length and mbuf chain */
6701	if (uio) {
6702		ca->sndlen = uio->uio_resid;
6703		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6704		if (ca->m == NULL) {
6705			SCTP_FREE(ca, SCTP_M_COPYAL);
6706			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6707			return (ENOMEM);
6708		}
6709	} else {
6710		/* Gather the length of the send */
6711		struct mbuf *mat;
6712
6713		ca->sndlen = 0;
6714		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6715			ca->sndlen += SCTP_BUF_LEN(mat);
6716		}
6717	}
6718	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6719	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6720	    SCTP_ASOC_ANY_STATE,
6721	    (void *)ca, 0,
6722	    sctp_sendall_completes, inp, 1);
6723	if (ret) {
6724		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6725		SCTP_FREE(ca, SCTP_M_COPYAL);
6726		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6727		return (EFAULT);
6728	}
6729	return (0);
6730}
6731
6732
6733void
6734sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6735{
6736	struct sctp_tmit_chunk *chk, *nchk;
6737
6738	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6739		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6740			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6741			if (chk->data) {
6742				sctp_m_freem(chk->data);
6743				chk->data = NULL;
6744			}
6745			asoc->ctrl_queue_cnt--;
6746			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6747		}
6748	}
6749}
6750
6751void
6752sctp_toss_old_asconf(struct sctp_tcb *stcb)
6753{
6754	struct sctp_association *asoc;
6755	struct sctp_tmit_chunk *chk, *nchk;
6756	struct sctp_asconf_chunk *acp;
6757
6758	asoc = &stcb->asoc;
6759	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6760		/* find SCTP_ASCONF chunk in queue */
6761		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6762			if (chk->data) {
6763				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6764				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6765					/* Not Acked yet */
6766					break;
6767				}
6768			}
6769			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6770			if (chk->data) {
6771				sctp_m_freem(chk->data);
6772				chk->data = NULL;
6773			}
6774			asoc->ctrl_queue_cnt--;
6775			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6776		}
6777	}
6778}
6779
6780
6781static void
6782sctp_clean_up_datalist(struct sctp_tcb *stcb,
6783    struct sctp_association *asoc,
6784    struct sctp_tmit_chunk **data_list,
6785    int bundle_at,
6786    struct sctp_nets *net)
6787{
6788	int i;
6789	struct sctp_tmit_chunk *tp1;
6790
6791	for (i = 0; i < bundle_at; i++) {
6792		/* off of the send queue */
6793		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6794		asoc->send_queue_cnt--;
6795		if (i > 0) {
6796			/*
6797			 * Any chunk NOT 0 you zap the time chunk 0 gets
6798			 * zapped or set based on if a RTO measurment is
6799			 * needed.
6800			 */
6801			data_list[i]->do_rtt = 0;
6802		}
6803		/* record time */
6804		data_list[i]->sent_rcv_time = net->last_sent_time;
6805		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6806		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6807		if (data_list[i]->whoTo == NULL) {
6808			data_list[i]->whoTo = net;
6809			atomic_add_int(&net->ref_count, 1);
6810		}
6811		/* on to the sent queue */
6812		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6813		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6814			struct sctp_tmit_chunk *tpp;
6815
6816			/* need to move back */
6817	back_up_more:
6818			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6819			if (tpp == NULL) {
6820				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6821				goto all_done;
6822			}
6823			tp1 = tpp;
6824			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6825				goto back_up_more;
6826			}
6827			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6828		} else {
6829			TAILQ_INSERT_TAIL(&asoc->sent_queue,
6830			    data_list[i],
6831			    sctp_next);
6832		}
6833all_done:
6834		/* This does not lower until the cum-ack passes it */
6835		asoc->sent_queue_cnt++;
6836		if ((asoc->peers_rwnd <= 0) &&
6837		    (asoc->total_flight == 0) &&
6838		    (bundle_at == 1)) {
6839			/* Mark the chunk as being a window probe */
6840			SCTP_STAT_INCR(sctps_windowprobed);
6841		}
6842#ifdef SCTP_AUDITING_ENABLED
6843		sctp_audit_log(0xC2, 3);
6844#endif
6845		data_list[i]->sent = SCTP_DATAGRAM_SENT;
6846		data_list[i]->snd_count = 1;
6847		data_list[i]->rec.data.chunk_was_revoked = 0;
6848		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6849			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6850			    data_list[i]->whoTo->flight_size,
6851			    data_list[i]->book_size,
6852			    (uintptr_t) data_list[i]->whoTo,
6853			    data_list[i]->rec.data.TSN_seq);
6854		}
6855		sctp_flight_size_increase(data_list[i]);
6856		sctp_total_flight_increase(stcb, data_list[i]);
6857		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6858			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6859			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6860		}
6861		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6862		    (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6863		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6864			/* SWS sender side engages */
6865			asoc->peers_rwnd = 0;
6866		}
6867	}
6868	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6869		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6870	}
6871}
6872
6873static void
6874sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6875#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6876    SCTP_UNUSED
6877#endif
6878)
6879{
6880	struct sctp_tmit_chunk *chk, *nchk;
6881
6882	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6883		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6884		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
6885		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6886		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6887		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6888		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6889		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6890		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6891		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6892		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6893		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6894		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6895			/* Stray chunks must be cleaned up */
6896	clean_up_anyway:
6897			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6898			if (chk->data) {
6899				sctp_m_freem(chk->data);
6900				chk->data = NULL;
6901			}
6902			asoc->ctrl_queue_cnt--;
6903			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6904				asoc->fwd_tsn_cnt--;
6905			sctp_free_a_chunk(stcb, chk, so_locked);
6906		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6907			/* special handling, we must look into the param */
6908			if (chk != asoc->str_reset) {
6909				goto clean_up_anyway;
6910			}
6911		}
6912	}
6913}
6914
6915
6916static int
6917sctp_can_we_split_this(struct sctp_tcb *stcb,
6918    uint32_t length,
6919    uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6920{
6921	/*
6922	 * Make a decision on if I should split a msg into multiple parts.
6923	 * This is only asked of incomplete messages.
6924	 */
6925	if (eeor_on) {
6926		/*
6927		 * If we are doing EEOR we need to always send it if its the
6928		 * entire thing, since it might be all the guy is putting in
6929		 * the hopper.
6930		 */
6931		if (goal_mtu >= length) {
6932			/*-
6933			 * If we have data outstanding,
6934			 * we get another chance when the sack
6935			 * arrives to transmit - wait for more data
6936			 */
6937			if (stcb->asoc.total_flight == 0) {
6938				/*
6939				 * If nothing is in flight, we zero the
6940				 * packet counter.
6941				 */
6942				return (length);
6943			}
6944			return (0);
6945
6946		} else {
6947			/* You can fill the rest */
6948			return (goal_mtu);
6949		}
6950	}
6951	/*-
6952	 * For those strange folk that make the send buffer
6953	 * smaller than our fragmentation point, we can't
6954	 * get a full msg in so we have to allow splitting.
6955	 */
6956	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6957		return (length);
6958	}
6959	if ((length <= goal_mtu) ||
6960	    ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6961		/* Sub-optimial residual don't split in non-eeor mode. */
6962		return (0);
6963	}
6964	/*
6965	 * If we reach here length is larger than the goal_mtu. Do we wish
6966	 * to split it for the sake of packet putting together?
6967	 */
6968	if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6969		/* Its ok to split it */
6970		return (min(goal_mtu, frag_point));
6971	}
6972	/* Nope, can't split */
6973	return (0);
6974
6975}
6976
6977static uint32_t
6978sctp_move_to_outqueue(struct sctp_tcb *stcb,
6979    struct sctp_stream_out *strq,
6980    uint32_t goal_mtu,
6981    uint32_t frag_point,
6982    int *locked,
6983    int *giveup,
6984    int eeor_mode,
6985    int *bail,
6986    int so_locked
6987#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6988    SCTP_UNUSED
6989#endif
6990)
6991{
6992	/* Move from the stream to the send_queue keeping track of the total */
6993	struct sctp_association *asoc;
6994	struct sctp_stream_queue_pending *sp;
6995	struct sctp_tmit_chunk *chk;
6996	struct sctp_data_chunk *dchkh;
6997	uint32_t to_move, length;
6998	uint8_t rcv_flags = 0;
6999	uint8_t some_taken;
7000	uint8_t send_lock_up = 0;
7001
7002	SCTP_TCB_LOCK_ASSERT(stcb);
7003	asoc = &stcb->asoc;
7004one_more_time:
7005	/* sa_ignore FREED_MEMORY */
7006	sp = TAILQ_FIRST(&strq->outqueue);
7007	if (sp == NULL) {
7008		*locked = 0;
7009		if (send_lock_up == 0) {
7010			SCTP_TCB_SEND_LOCK(stcb);
7011			send_lock_up = 1;
7012		}
7013		sp = TAILQ_FIRST(&strq->outqueue);
7014		if (sp) {
7015			goto one_more_time;
7016		}
7017		if (strq->last_msg_incomplete) {
7018			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7019			    strq->stream_no,
7020			    strq->last_msg_incomplete);
7021			strq->last_msg_incomplete = 0;
7022		}
7023		to_move = 0;
7024		if (send_lock_up) {
7025			SCTP_TCB_SEND_UNLOCK(stcb);
7026			send_lock_up = 0;
7027		}
7028		goto out_of;
7029	}
7030	if ((sp->msg_is_complete) && (sp->length == 0)) {
7031		if (sp->sender_all_done) {
7032			/*
7033			 * We are doing differed cleanup. Last time through
7034			 * when we took all the data the sender_all_done was
7035			 * not set.
7036			 */
7037			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7038				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7039				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7040				    sp->sender_all_done,
7041				    sp->length,
7042				    sp->msg_is_complete,
7043				    sp->put_last_out,
7044				    send_lock_up);
7045			}
7046			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7047				SCTP_TCB_SEND_LOCK(stcb);
7048				send_lock_up = 1;
7049			}
7050			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7051			TAILQ_REMOVE(&strq->outqueue, sp, next);
7052			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7053			if (sp->net) {
7054				sctp_free_remote_addr(sp->net);
7055				sp->net = NULL;
7056			}
7057			if (sp->data) {
7058				sctp_m_freem(sp->data);
7059				sp->data = NULL;
7060			}
7061			sctp_free_a_strmoq(stcb, sp, so_locked);
7062			/* we can't be locked to it */
7063			*locked = 0;
7064			stcb->asoc.locked_on_sending = NULL;
7065			if (send_lock_up) {
7066				SCTP_TCB_SEND_UNLOCK(stcb);
7067				send_lock_up = 0;
7068			}
7069			/* back to get the next msg */
7070			goto one_more_time;
7071		} else {
7072			/*
7073			 * sender just finished this but still holds a
7074			 * reference
7075			 */
7076			*locked = 1;
7077			*giveup = 1;
7078			to_move = 0;
7079			goto out_of;
7080		}
7081	} else {
7082		/* is there some to get */
7083		if (sp->length == 0) {
7084			/* no */
7085			*locked = 1;
7086			*giveup = 1;
7087			to_move = 0;
7088			goto out_of;
7089		} else if (sp->discard_rest) {
7090			if (send_lock_up == 0) {
7091				SCTP_TCB_SEND_LOCK(stcb);
7092				send_lock_up = 1;
7093			}
7094			/* Whack down the size */
7095			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7096			if ((stcb->sctp_socket != NULL) && \
7097			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7098			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7099				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7100			}
7101			if (sp->data) {
7102				sctp_m_freem(sp->data);
7103				sp->data = NULL;
7104				sp->tail_mbuf = NULL;
7105			}
7106			sp->length = 0;
7107			sp->some_taken = 1;
7108			*locked = 1;
7109			*giveup = 1;
7110			to_move = 0;
7111			goto out_of;
7112		}
7113	}
7114	some_taken = sp->some_taken;
7115	if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7116		sp->msg_is_complete = 1;
7117	}
7118re_look:
7119	length = sp->length;
7120	if (sp->msg_is_complete) {
7121		/* The message is complete */
7122		to_move = min(length, frag_point);
7123		if (to_move == length) {
7124			/* All of it fits in the MTU */
7125			if (sp->some_taken) {
7126				rcv_flags |= SCTP_DATA_LAST_FRAG;
7127				sp->put_last_out = 1;
7128			} else {
7129				rcv_flags |= SCTP_DATA_NOT_FRAG;
7130				sp->put_last_out = 1;
7131			}
7132		} else {
7133			/* Not all of it fits, we fragment */
7134			if (sp->some_taken == 0) {
7135				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7136			}
7137			sp->some_taken = 1;
7138		}
7139	} else {
7140		to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7141		if (to_move) {
7142			/*-
7143			 * We use a snapshot of length in case it
7144			 * is expanding during the compare.
7145			 */
7146			uint32_t llen;
7147
7148			llen = length;
7149			if (to_move >= llen) {
7150				to_move = llen;
7151				if (send_lock_up == 0) {
7152					/*-
7153					 * We are taking all of an incomplete msg
7154					 * thus we need a send lock.
7155					 */
7156					SCTP_TCB_SEND_LOCK(stcb);
7157					send_lock_up = 1;
7158					if (sp->msg_is_complete) {
7159						/*
7160						 * the sender finished the
7161						 * msg
7162						 */
7163						goto re_look;
7164					}
7165				}
7166			}
7167			if (sp->some_taken == 0) {
7168				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7169				sp->some_taken = 1;
7170			}
7171		} else {
7172			/* Nothing to take. */
7173			if (sp->some_taken) {
7174				*locked = 1;
7175			}
7176			*giveup = 1;
7177			to_move = 0;
7178			goto out_of;
7179		}
7180	}
7181
7182	/* If we reach here, we can copy out a chunk */
7183	sctp_alloc_a_chunk(stcb, chk);
7184	if (chk == NULL) {
7185		/* No chunk memory */
7186		*giveup = 1;
7187		to_move = 0;
7188		goto out_of;
7189	}
7190	/*
7191	 * Setup for unordered if needed by looking at the user sent info
7192	 * flags.
7193	 */
7194	if (sp->sinfo_flags & SCTP_UNORDERED) {
7195		rcv_flags |= SCTP_DATA_UNORDERED;
7196	}
7197	if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7198	    ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7199		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7200	}
7201	/* clear out the chunk before setting up */
7202	memset(chk, 0, sizeof(*chk));
7203	chk->rec.data.rcv_flags = rcv_flags;
7204
7205	if (to_move >= length) {
7206		/* we think we can steal the whole thing */
7207		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7208			SCTP_TCB_SEND_LOCK(stcb);
7209			send_lock_up = 1;
7210		}
7211		if (to_move < sp->length) {
7212			/* bail, it changed */
7213			goto dont_do_it;
7214		}
7215		chk->data = sp->data;
7216		chk->last_mbuf = sp->tail_mbuf;
7217		/* register the stealing */
7218		sp->data = sp->tail_mbuf = NULL;
7219	} else {
7220		struct mbuf *m;
7221
7222dont_do_it:
7223		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7224		chk->last_mbuf = NULL;
7225		if (chk->data == NULL) {
7226			sp->some_taken = some_taken;
7227			sctp_free_a_chunk(stcb, chk, so_locked);
7228			*bail = 1;
7229			to_move = 0;
7230			goto out_of;
7231		}
7232#ifdef SCTP_MBUF_LOGGING
7233		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7234			struct mbuf *mat;
7235
7236			for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7237				if (SCTP_BUF_IS_EXTENDED(mat)) {
7238					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7239				}
7240			}
7241		}
7242#endif
7243		/* Pull off the data */
7244		m_adj(sp->data, to_move);
7245		/* Now lets work our way down and compact it */
7246		m = sp->data;
7247		while (m && (SCTP_BUF_LEN(m) == 0)) {
7248			sp->data = SCTP_BUF_NEXT(m);
7249			SCTP_BUF_NEXT(m) = NULL;
7250			if (sp->tail_mbuf == m) {
7251				/*-
7252				 * Freeing tail? TSNH since
7253				 * we supposedly were taking less
7254				 * than the sp->length.
7255				 */
7256#ifdef INVARIANTS
7257				panic("Huh, freing tail? - TSNH");
7258#else
7259				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7260				sp->tail_mbuf = sp->data = NULL;
7261				sp->length = 0;
7262#endif
7263
7264			}
7265			sctp_m_free(m);
7266			m = sp->data;
7267		}
7268	}
7269	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7270		chk->copy_by_ref = 1;
7271	} else {
7272		chk->copy_by_ref = 0;
7273	}
7274	/*
7275	 * get last_mbuf and counts of mb useage This is ugly but hopefully
7276	 * its only one mbuf.
7277	 */
7278	if (chk->last_mbuf == NULL) {
7279		chk->last_mbuf = chk->data;
7280		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7281			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7282		}
7283	}
7284	if (to_move > length) {
7285		/*- This should not happen either
7286		 * since we always lower to_move to the size
7287		 * of sp->length if its larger.
7288		 */
7289#ifdef INVARIANTS
7290		panic("Huh, how can to_move be larger?");
7291#else
7292		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7293		sp->length = 0;
7294#endif
7295	} else {
7296		atomic_subtract_int(&sp->length, to_move);
7297	}
7298	if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7299		/* Not enough room for a chunk header, get some */
7300		struct mbuf *m;
7301
7302		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7303		if (m == NULL) {
7304			/*
7305			 * we're in trouble here. _PREPEND below will free
7306			 * all the data if there is no leading space, so we
7307			 * must put the data back and restore.
7308			 */
7309			if (send_lock_up == 0) {
7310				SCTP_TCB_SEND_LOCK(stcb);
7311				send_lock_up = 1;
7312			}
7313			if (chk->data == NULL) {
7314				/* unsteal the data */
7315				sp->data = chk->data;
7316				sp->tail_mbuf = chk->last_mbuf;
7317			} else {
7318				struct mbuf *m_tmp;
7319
7320				/* reassemble the data */
7321				m_tmp = sp->data;
7322				sp->data = chk->data;
7323				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7324			}
7325			sp->some_taken = some_taken;
7326			atomic_add_int(&sp->length, to_move);
7327			chk->data = NULL;
7328			*bail = 1;
7329			sctp_free_a_chunk(stcb, chk, so_locked);
7330			to_move = 0;
7331			goto out_of;
7332		} else {
7333			SCTP_BUF_LEN(m) = 0;
7334			SCTP_BUF_NEXT(m) = chk->data;
7335			chk->data = m;
7336			M_ALIGN(chk->data, 4);
7337		}
7338	}
7339	SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7340	if (chk->data == NULL) {
7341		/* HELP, TSNH since we assured it would not above? */
7342#ifdef INVARIANTS
7343		panic("prepend failes HELP?");
7344#else
7345		SCTP_PRINTF("prepend fails HELP?\n");
7346		sctp_free_a_chunk(stcb, chk, so_locked);
7347#endif
7348		*bail = 1;
7349		to_move = 0;
7350		goto out_of;
7351	}
7352	sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7353	chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7354	chk->book_size_scale = 0;
7355	chk->sent = SCTP_DATAGRAM_UNSENT;
7356
7357	chk->flags = 0;
7358	chk->asoc = &stcb->asoc;
7359	chk->pad_inplace = 0;
7360	chk->no_fr_allowed = 0;
7361	chk->rec.data.stream_seq = strq->next_sequence_send;
7362	if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7363		strq->next_sequence_send++;
7364	}
7365	chk->rec.data.stream_number = sp->stream;
7366	chk->rec.data.payloadtype = sp->ppid;
7367	chk->rec.data.context = sp->context;
7368	chk->rec.data.doing_fast_retransmit = 0;
7369
7370	chk->rec.data.timetodrop = sp->ts;
7371	chk->flags = sp->act_flags;
7372
7373	if (sp->net) {
7374		chk->whoTo = sp->net;
7375		atomic_add_int(&chk->whoTo->ref_count, 1);
7376	} else
7377		chk->whoTo = NULL;
7378
7379	if (sp->holds_key_ref) {
7380		chk->auth_keyid = sp->auth_keyid;
7381		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7382		chk->holds_key_ref = 1;
7383	}
7384	chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7385	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7386		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7387		    (uintptr_t) stcb, sp->length,
7388		    (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7389		    chk->rec.data.TSN_seq);
7390	}
7391	dchkh = mtod(chk->data, struct sctp_data_chunk *);
7392	/*
7393	 * Put the rest of the things in place now. Size was done earlier in
7394	 * previous loop prior to padding.
7395	 */
7396
7397#ifdef SCTP_ASOCLOG_OF_TSNS
7398	SCTP_TCB_LOCK_ASSERT(stcb);
7399	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7400		asoc->tsn_out_at = 0;
7401		asoc->tsn_out_wrapped = 1;
7402	}
7403	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7404	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7405	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7406	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7407	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7408	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7409	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7410	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7411	asoc->tsn_out_at++;
7412#endif
7413
7414	dchkh->ch.chunk_type = SCTP_DATA;
7415	dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7416	dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7417	dchkh->dp.stream_id = htons(strq->stream_no);
7418	dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7419	dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7420	dchkh->ch.chunk_length = htons(chk->send_size);
7421	/* Now advance the chk->send_size by the actual pad needed. */
7422	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7423		/* need a pad */
7424		struct mbuf *lm;
7425		int pads;
7426
7427		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7428		if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7429			chk->pad_inplace = 1;
7430		}
7431		if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7432			/* pad added an mbuf */
7433			chk->last_mbuf = lm;
7434		}
7435		chk->send_size += pads;
7436	}
7437	if (PR_SCTP_ENABLED(chk->flags)) {
7438		asoc->pr_sctp_cnt++;
7439	}
7440	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7441		/* All done pull and kill the message */
7442		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7443		if (sp->put_last_out == 0) {
7444			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7445			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7446			    sp->sender_all_done,
7447			    sp->length,
7448			    sp->msg_is_complete,
7449			    sp->put_last_out,
7450			    send_lock_up);
7451		}
7452		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7453			SCTP_TCB_SEND_LOCK(stcb);
7454			send_lock_up = 1;
7455		}
7456		TAILQ_REMOVE(&strq->outqueue, sp, next);
7457		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7458		if (sp->net) {
7459			sctp_free_remote_addr(sp->net);
7460			sp->net = NULL;
7461		}
7462		if (sp->data) {
7463			sctp_m_freem(sp->data);
7464			sp->data = NULL;
7465		}
7466		sctp_free_a_strmoq(stcb, sp, so_locked);
7467
7468		/* we can't be locked to it */
7469		*locked = 0;
7470		stcb->asoc.locked_on_sending = NULL;
7471	} else {
7472		/* more to go, we are locked */
7473		*locked = 1;
7474	}
7475	asoc->chunks_on_out_queue++;
7476	strq->chunks_on_queues++;
7477	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7478	asoc->send_queue_cnt++;
7479out_of:
7480	if (send_lock_up) {
7481		SCTP_TCB_SEND_UNLOCK(stcb);
7482	}
7483	return (to_move);
7484}
7485
7486
7487static void
7488sctp_fill_outqueue(struct sctp_tcb *stcb,
7489    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7490#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7491    SCTP_UNUSED
7492#endif
7493)
7494{
7495	struct sctp_association *asoc;
7496	struct sctp_stream_out *strq;
7497	int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7498	int locked, giveup;
7499
7500	SCTP_TCB_LOCK_ASSERT(stcb);
7501	asoc = &stcb->asoc;
7502	switch (net->ro._l_addr.sa.sa_family) {
7503#ifdef INET
7504	case AF_INET:
7505		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7506		break;
7507#endif
7508#ifdef INET6
7509	case AF_INET6:
7510		goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7511		break;
7512#endif
7513	default:
7514		/* TSNH */
7515		goal_mtu = net->mtu;
7516		break;
7517	}
7518	/* Need an allowance for the data chunk header too */
7519	goal_mtu -= sizeof(struct sctp_data_chunk);
7520
7521	/* must make even word boundary */
7522	goal_mtu &= 0xfffffffc;
7523	if (asoc->locked_on_sending) {
7524		/* We are stuck on one stream until the message completes. */
7525		strq = asoc->locked_on_sending;
7526		locked = 1;
7527	} else {
7528		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7529		locked = 0;
7530	}
7531	while ((goal_mtu > 0) && strq) {
7532		giveup = 0;
7533		bail = 0;
7534		moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7535		    &giveup, eeor_mode, &bail, so_locked);
7536		if (moved_how_much)
7537			stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7538
7539		if (locked) {
7540			asoc->locked_on_sending = strq;
7541			if ((moved_how_much == 0) || (giveup) || bail)
7542				/* no more to move for now */
7543				break;
7544		} else {
7545			asoc->locked_on_sending = NULL;
7546			if ((giveup) || bail) {
7547				break;
7548			}
7549			strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7550			if (strq == NULL) {
7551				break;
7552			}
7553		}
7554		total_moved += moved_how_much;
7555		goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7556		goal_mtu &= 0xfffffffc;
7557	}
7558	if (bail)
7559		*quit_now = 1;
7560
7561	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7562
7563	if (total_moved == 0) {
7564		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7565		    (net == stcb->asoc.primary_destination)) {
7566			/* ran dry for primary network net */
7567			SCTP_STAT_INCR(sctps_primary_randry);
7568		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7569			/* ran dry with CMT on */
7570			SCTP_STAT_INCR(sctps_cmt_randry);
7571		}
7572	}
7573}
7574
7575void
7576sctp_fix_ecn_echo(struct sctp_association *asoc)
7577{
7578	struct sctp_tmit_chunk *chk;
7579
7580	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7581		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7582			chk->sent = SCTP_DATAGRAM_UNSENT;
7583		}
7584	}
7585}
7586
7587void
7588sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7589{
7590	struct sctp_association *asoc;
7591	struct sctp_tmit_chunk *chk;
7592	struct sctp_stream_queue_pending *sp;
7593	unsigned int i;
7594
7595	if (net == NULL) {
7596		return;
7597	}
7598	asoc = &stcb->asoc;
7599	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7600		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7601			if (sp->net == net) {
7602				sctp_free_remote_addr(sp->net);
7603				sp->net = NULL;
7604			}
7605		}
7606	}
7607	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7608		if (chk->whoTo == net) {
7609			sctp_free_remote_addr(chk->whoTo);
7610			chk->whoTo = NULL;
7611		}
7612	}
7613}
7614
7615int
7616sctp_med_chunk_output(struct sctp_inpcb *inp,
7617    struct sctp_tcb *stcb,
7618    struct sctp_association *asoc,
7619    int *num_out,
7620    int *reason_code,
7621    int control_only, int from_where,
7622    struct timeval *now, int *now_filled, int frag_point, int so_locked
7623#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7624    SCTP_UNUSED
7625#endif
7626)
7627{
7628	/**
7629	 * Ok this is the generic chunk service queue. we must do the
7630	 * following: - Service the stream queue that is next, moving any
7631	 * message (note I must get a complete message i.e. FIRST/MIDDLE and
7632	 * LAST to the out queue in one pass) and assigning TSN's - Check to
7633	 * see if the cwnd/rwnd allows any output, if so we go ahead and
7634	 * fomulate and send the low level chunks. Making sure to combine
7635	 * any control in the control chunk queue also.
7636	 */
7637	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7638	struct mbuf *outchain, *endoutchain;
7639	struct sctp_tmit_chunk *chk, *nchk;
7640
7641	/* temp arrays for unlinking */
7642	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7643	int no_fragmentflg, error;
7644	unsigned int max_rwnd_per_dest, max_send_per_dest;
7645	int one_chunk, hbflag, skip_data_for_this_net;
7646	int asconf, cookie, no_out_cnt;
7647	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7648	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7649	int tsns_sent = 0;
7650	uint32_t auth_offset = 0;
7651	struct sctp_auth_chunk *auth = NULL;
7652	uint16_t auth_keyid;
7653	int override_ok = 1;
7654	int skip_fill_up = 0;
7655	int data_auth_reqd = 0;
7656
7657	/*
7658	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7659	 * destination.
7660	 */
7661	int quit_now = 0;
7662
7663	*num_out = 0;
7664	auth_keyid = stcb->asoc.authinfo.active_keyid;
7665
7666	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7667	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7668	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7669		eeor_mode = 1;
7670	} else {
7671		eeor_mode = 0;
7672	}
7673	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7674	/*
7675	 * First lets prime the pump. For each destination, if there is room
7676	 * in the flight size, attempt to pull an MTU's worth out of the
7677	 * stream queues into the general send_queue
7678	 */
7679#ifdef SCTP_AUDITING_ENABLED
7680	sctp_audit_log(0xC2, 2);
7681#endif
7682	SCTP_TCB_LOCK_ASSERT(stcb);
7683	hbflag = 0;
7684	if ((control_only) || (asoc->stream_reset_outstanding))
7685		no_data_chunks = 1;
7686	else
7687		no_data_chunks = 0;
7688
7689	/* Nothing to possible to send? */
7690	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7691	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7692	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7693	    TAILQ_EMPTY(&asoc->send_queue) &&
7694	    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7695nothing_to_send:
7696		*reason_code = 9;
7697		return (0);
7698	}
7699	if (asoc->peers_rwnd == 0) {
7700		/* No room in peers rwnd */
7701		*reason_code = 1;
7702		if (asoc->total_flight > 0) {
7703			/* we are allowed one chunk in flight */
7704			no_data_chunks = 1;
7705		}
7706	}
7707	if (stcb->asoc.ecn_echo_cnt_onq) {
7708		/* Record where a sack goes, if any */
7709		if (no_data_chunks &&
7710		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7711			/* Nothing but ECNe to send - we don't do that */
7712			goto nothing_to_send;
7713		}
7714		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7715			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7716			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7717				sack_goes_to = chk->whoTo;
7718				break;
7719			}
7720		}
7721	}
7722	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7723	if (stcb->sctp_socket)
7724		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7725	else
7726		max_send_per_dest = 0;
7727	if (no_data_chunks == 0) {
7728		/* How many non-directed chunks are there? */
7729		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7730			if (chk->whoTo == NULL) {
7731				/*
7732				 * We already have non-directed chunks on
7733				 * the queue, no need to do a fill-up.
7734				 */
7735				skip_fill_up = 1;
7736				break;
7737			}
7738		}
7739
7740	}
7741	if ((no_data_chunks == 0) &&
7742	    (skip_fill_up == 0) &&
7743	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7744		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7745			/*
7746			 * This for loop we are in takes in each net, if
7747			 * its's got space in cwnd and has data sent to it
7748			 * (when CMT is off) then it calls
7749			 * sctp_fill_outqueue for the net. This gets data on
7750			 * the send queue for that network.
7751			 *
7752			 * In sctp_fill_outqueue TSN's are assigned and data is
7753			 * copied out of the stream buffers. Note mostly
7754			 * copy by reference (we hope).
7755			 */
7756			net->window_probe = 0;
7757			if ((net != stcb->asoc.alternate) &&
7758			    ((net->dest_state & SCTP_ADDR_PF) ||
7759			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7760			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7761				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7762					sctp_log_cwnd(stcb, net, 1,
7763					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7764				}
7765				continue;
7766			}
7767			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7768			    (net->flight_size == 0)) {
7769				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7770			}
7771			if (net->flight_size >= net->cwnd) {
7772				/* skip this network, no room - can't fill */
7773				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7774					sctp_log_cwnd(stcb, net, 3,
7775					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7776				}
7777				continue;
7778			}
7779			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7780				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7781			}
7782			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7783			if (quit_now) {
7784				/* memory alloc failure */
7785				no_data_chunks = 1;
7786				break;
7787			}
7788		}
7789	}
7790	/* now service each destination and send out what we can for it */
7791	/* Nothing to send? */
7792	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7793	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7794	    TAILQ_EMPTY(&asoc->send_queue)) {
7795		*reason_code = 8;
7796		return (0);
7797	}
7798	if (asoc->sctp_cmt_on_off > 0) {
7799		/* get the last start point */
7800		start_at = asoc->last_net_cmt_send_started;
7801		if (start_at == NULL) {
7802			/* null so to beginning */
7803			start_at = TAILQ_FIRST(&asoc->nets);
7804		} else {
7805			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7806			if (start_at == NULL) {
7807				start_at = TAILQ_FIRST(&asoc->nets);
7808			}
7809		}
7810		asoc->last_net_cmt_send_started = start_at;
7811	} else {
7812		start_at = TAILQ_FIRST(&asoc->nets);
7813	}
7814	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7815		if (chk->whoTo == NULL) {
7816			if (asoc->alternate) {
7817				chk->whoTo = asoc->alternate;
7818			} else {
7819				chk->whoTo = asoc->primary_destination;
7820			}
7821			atomic_add_int(&chk->whoTo->ref_count, 1);
7822		}
7823	}
7824	old_start_at = NULL;
7825again_one_more_time:
7826	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7827		/* how much can we send? */
7828		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7829		if (old_start_at && (old_start_at == net)) {
7830			/* through list ocmpletely. */
7831			break;
7832		}
7833		tsns_sent = 0xa;
7834		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7835		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7836		    (net->flight_size >= net->cwnd)) {
7837			/*
7838			 * Nothing on control or asconf and flight is full,
7839			 * we can skip even in the CMT case.
7840			 */
7841			continue;
7842		}
7843		bundle_at = 0;
7844		endoutchain = outchain = NULL;
7845		no_fragmentflg = 1;
7846		one_chunk = 0;
7847		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7848			skip_data_for_this_net = 1;
7849		} else {
7850			skip_data_for_this_net = 0;
7851		}
7852		if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7853			/*
7854			 * if we have a route and an ifp check to see if we
7855			 * have room to send to this guy
7856			 */
7857			struct ifnet *ifp;
7858
7859			ifp = net->ro.ro_rt->rt_ifp;
7860			if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7861				SCTP_STAT_INCR(sctps_ifnomemqueued);
7862				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7863					sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7864				}
7865				continue;
7866			}
7867		}
7868		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7869#ifdef INET
7870		case AF_INET:
7871			mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7872			break;
7873#endif
7874#ifdef INET6
7875		case AF_INET6:
7876			mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7877			break;
7878#endif
7879		default:
7880			/* TSNH */
7881			mtu = net->mtu;
7882			break;
7883		}
7884		mx_mtu = mtu;
7885		to_out = 0;
7886		if (mtu > asoc->peers_rwnd) {
7887			if (asoc->total_flight > 0) {
7888				/* We have a packet in flight somewhere */
7889				r_mtu = asoc->peers_rwnd;
7890			} else {
7891				/* We are always allowed to send one MTU out */
7892				one_chunk = 1;
7893				r_mtu = mtu;
7894			}
7895		} else {
7896			r_mtu = mtu;
7897		}
7898		/************************/
7899		/* ASCONF transmission */
7900		/************************/
7901		/* Now first lets go through the asconf queue */
7902		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7903			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7904				continue;
7905			}
7906			if (chk->whoTo == NULL) {
7907				if (asoc->alternate == NULL) {
7908					if (asoc->primary_destination != net) {
7909						break;
7910					}
7911				} else {
7912					if (asoc->alternate != net) {
7913						break;
7914					}
7915				}
7916			} else {
7917				if (chk->whoTo != net) {
7918					break;
7919				}
7920			}
7921			if (chk->data == NULL) {
7922				break;
7923			}
7924			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7925			    chk->sent != SCTP_DATAGRAM_RESEND) {
7926				break;
7927			}
7928			/*
7929			 * if no AUTH is yet included and this chunk
7930			 * requires it, make sure to account for it.  We
7931			 * don't apply the size until the AUTH chunk is
7932			 * actually added below in case there is no room for
7933			 * this chunk. NOTE: we overload the use of "omtu"
7934			 * here
7935			 */
7936			if ((auth == NULL) &&
7937			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7938			    stcb->asoc.peer_auth_chunks)) {
7939				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7940			} else
7941				omtu = 0;
7942			/* Here we do NOT factor the r_mtu */
7943			if ((chk->send_size < (int)(mtu - omtu)) ||
7944			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7945				/*
7946				 * We probably should glom the mbuf chain
7947				 * from the chk->data for control but the
7948				 * problem is it becomes yet one more level
7949				 * of tracking to do if for some reason
7950				 * output fails. Then I have got to
7951				 * reconstruct the merged control chain.. el
7952				 * yucko.. for now we take the easy way and
7953				 * do the copy
7954				 */
7955				/*
7956				 * Add an AUTH chunk, if chunk requires it
7957				 * save the offset into the chain for AUTH
7958				 */
7959				if ((auth == NULL) &&
7960				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7961				    stcb->asoc.peer_auth_chunks))) {
7962					outchain = sctp_add_auth_chunk(outchain,
7963					    &endoutchain,
7964					    &auth,
7965					    &auth_offset,
7966					    stcb,
7967					    chk->rec.chunk_id.id);
7968					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7969				}
7970				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7971				    (int)chk->rec.chunk_id.can_take_data,
7972				    chk->send_size, chk->copy_by_ref);
7973				if (outchain == NULL) {
7974					*reason_code = 8;
7975					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7976					return (ENOMEM);
7977				}
7978				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7979				/* update our MTU size */
7980				if (mtu > (chk->send_size + omtu))
7981					mtu -= (chk->send_size + omtu);
7982				else
7983					mtu = 0;
7984				to_out += (chk->send_size + omtu);
7985				/* Do clear IP_DF ? */
7986				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7987					no_fragmentflg = 0;
7988				}
7989				if (chk->rec.chunk_id.can_take_data)
7990					chk->data = NULL;
7991				/*
7992				 * set hb flag since we can use these for
7993				 * RTO
7994				 */
7995				hbflag = 1;
7996				asconf = 1;
7997				/*
7998				 * should sysctl this: don't bundle data
7999				 * with ASCONF since it requires AUTH
8000				 */
8001				no_data_chunks = 1;
8002				chk->sent = SCTP_DATAGRAM_SENT;
8003				if (chk->whoTo == NULL) {
8004					chk->whoTo = net;
8005					atomic_add_int(&net->ref_count, 1);
8006				}
8007				chk->snd_count++;
8008				if (mtu == 0) {
8009					/*
8010					 * Ok we are out of room but we can
8011					 * output without effecting the
8012					 * flight size since this little guy
8013					 * is a control only packet.
8014					 */
8015					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8016					/*
8017					 * do NOT clear the asconf flag as
8018					 * it is used to do appropriate
8019					 * source address selection.
8020					 */
8021					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8022					    (struct sockaddr *)&net->ro._l_addr,
8023					    outchain, auth_offset, auth,
8024					    stcb->asoc.authinfo.active_keyid,
8025					    no_fragmentflg, 0, asconf,
8026					    inp->sctp_lport, stcb->rport,
8027					    htonl(stcb->asoc.peer_vtag),
8028					    net->port, NULL,
8029					    0, 0,
8030					    so_locked))) {
8031						if (error == ENOBUFS) {
8032							asoc->ifp_had_enobuf = 1;
8033							SCTP_STAT_INCR(sctps_lowlevelerr);
8034						}
8035						if (from_where == 0) {
8036							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8037						}
8038						if (*now_filled == 0) {
8039							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8040							*now_filled = 1;
8041							*now = net->last_sent_time;
8042						} else {
8043							net->last_sent_time = *now;
8044						}
8045						hbflag = 0;
8046						/* error, could not output */
8047						if (error == EHOSTUNREACH) {
8048							/*
8049							 * Destination went
8050							 * unreachable
8051							 * during this send
8052							 */
8053							sctp_move_chunks_from_net(stcb, net);
8054						}
8055						*reason_code = 7;
8056						continue;
8057					} else
8058						asoc->ifp_had_enobuf = 0;
8059					if (*now_filled == 0) {
8060						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8061						*now_filled = 1;
8062						*now = net->last_sent_time;
8063					} else {
8064						net->last_sent_time = *now;
8065					}
8066					hbflag = 0;
8067					/*
8068					 * increase the number we sent, if a
8069					 * cookie is sent we don't tell them
8070					 * any was sent out.
8071					 */
8072					outchain = endoutchain = NULL;
8073					auth = NULL;
8074					auth_offset = 0;
8075					if (!no_out_cnt)
8076						*num_out += ctl_cnt;
8077					/* recalc a clean slate and setup */
8078					switch (net->ro._l_addr.sa.sa_family) {
8079#ifdef INET
8080					case AF_INET:
8081						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8082						break;
8083#endif
8084#ifdef INET6
8085					case AF_INET6:
8086						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8087						break;
8088#endif
8089					default:
8090						/* TSNH */
8091						mtu = net->mtu;
8092						break;
8093					}
8094					to_out = 0;
8095					no_fragmentflg = 1;
8096				}
8097			}
8098		}
8099		/************************/
8100		/* Control transmission */
8101		/************************/
8102		/* Now first lets go through the control queue */
8103		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8104			if ((sack_goes_to) &&
8105			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8106			    (chk->whoTo != sack_goes_to)) {
8107				/*
8108				 * if we have a sack in queue, and we are
8109				 * looking at an ecn echo that is NOT queued
8110				 * to where the sack is going..
8111				 */
8112				if (chk->whoTo == net) {
8113					/*
8114					 * Don't transmit it to where its
8115					 * going (current net)
8116					 */
8117					continue;
8118				} else if (sack_goes_to == net) {
8119					/*
8120					 * But do transmit it to this
8121					 * address
8122					 */
8123					goto skip_net_check;
8124				}
8125			}
8126			if (chk->whoTo == NULL) {
8127				if (asoc->alternate == NULL) {
8128					if (asoc->primary_destination != net) {
8129						continue;
8130					}
8131				} else {
8132					if (asoc->alternate != net) {
8133						continue;
8134					}
8135				}
8136			} else {
8137				if (chk->whoTo != net) {
8138					continue;
8139				}
8140			}
8141	skip_net_check:
8142			if (chk->data == NULL) {
8143				continue;
8144			}
8145			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8146				/*
8147				 * It must be unsent. Cookies and ASCONF's
8148				 * hang around but there timers will force
8149				 * when marked for resend.
8150				 */
8151				continue;
8152			}
8153			/*
8154			 * if no AUTH is yet included and this chunk
8155			 * requires it, make sure to account for it.  We
8156			 * don't apply the size until the AUTH chunk is
8157			 * actually added below in case there is no room for
8158			 * this chunk. NOTE: we overload the use of "omtu"
8159			 * here
8160			 */
8161			if ((auth == NULL) &&
8162			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8163			    stcb->asoc.peer_auth_chunks)) {
8164				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8165			} else
8166				omtu = 0;
8167			/* Here we do NOT factor the r_mtu */
8168			if ((chk->send_size <= (int)(mtu - omtu)) ||
8169			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8170				/*
8171				 * We probably should glom the mbuf chain
8172				 * from the chk->data for control but the
8173				 * problem is it becomes yet one more level
8174				 * of tracking to do if for some reason
8175				 * output fails. Then I have got to
8176				 * reconstruct the merged control chain.. el
8177				 * yucko.. for now we take the easy way and
8178				 * do the copy
8179				 */
8180				/*
8181				 * Add an AUTH chunk, if chunk requires it
8182				 * save the offset into the chain for AUTH
8183				 */
8184				if ((auth == NULL) &&
8185				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8186				    stcb->asoc.peer_auth_chunks))) {
8187					outchain = sctp_add_auth_chunk(outchain,
8188					    &endoutchain,
8189					    &auth,
8190					    &auth_offset,
8191					    stcb,
8192					    chk->rec.chunk_id.id);
8193					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8194				}
8195				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8196				    (int)chk->rec.chunk_id.can_take_data,
8197				    chk->send_size, chk->copy_by_ref);
8198				if (outchain == NULL) {
8199					*reason_code = 8;
8200					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8201					return (ENOMEM);
8202				}
8203				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8204				/* update our MTU size */
8205				if (mtu > (chk->send_size + omtu))
8206					mtu -= (chk->send_size + omtu);
8207				else
8208					mtu = 0;
8209				to_out += (chk->send_size + omtu);
8210				/* Do clear IP_DF ? */
8211				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8212					no_fragmentflg = 0;
8213				}
8214				if (chk->rec.chunk_id.can_take_data)
8215					chk->data = NULL;
8216				/* Mark things to be removed, if needed */
8217				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8218				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8219				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8220				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8221				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8222				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8223				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8224				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8225				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8226				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8227				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8228					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8229						hbflag = 1;
8230					}
8231					/* remove these chunks at the end */
8232					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8233					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8234						/* turn off the timer */
8235						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8236							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8237							    inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8238						}
8239					}
8240					ctl_cnt++;
8241				} else {
8242					/*
8243					 * Other chunks, since they have
8244					 * timers running (i.e. COOKIE) we
8245					 * just "trust" that it gets sent or
8246					 * retransmitted.
8247					 */
8248					ctl_cnt++;
8249					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8250						cookie = 1;
8251						no_out_cnt = 1;
8252					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8253						/*
8254						 * Increment ecne send count
8255						 * here this means we may be
8256						 * over-zealous in our
8257						 * counting if the send
8258						 * fails, but its the best
8259						 * place to do it (we used
8260						 * to do it in the queue of
8261						 * the chunk, but that did
8262						 * not tell how many times
8263						 * it was sent.
8264						 */
8265						SCTP_STAT_INCR(sctps_sendecne);
8266					}
8267					chk->sent = SCTP_DATAGRAM_SENT;
8268					if (chk->whoTo == NULL) {
8269						chk->whoTo = net;
8270						atomic_add_int(&net->ref_count, 1);
8271					}
8272					chk->snd_count++;
8273				}
8274				if (mtu == 0) {
8275					/*
8276					 * Ok we are out of room but we can
8277					 * output without effecting the
8278					 * flight size since this little guy
8279					 * is a control only packet.
8280					 */
8281					if (asconf) {
8282						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8283						/*
8284						 * do NOT clear the asconf
8285						 * flag as it is used to do
8286						 * appropriate source
8287						 * address selection.
8288						 */
8289					}
8290					if (cookie) {
8291						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8292						cookie = 0;
8293					}
8294					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8295					    (struct sockaddr *)&net->ro._l_addr,
8296					    outchain,
8297					    auth_offset, auth,
8298					    stcb->asoc.authinfo.active_keyid,
8299					    no_fragmentflg, 0, asconf,
8300					    inp->sctp_lport, stcb->rport,
8301					    htonl(stcb->asoc.peer_vtag),
8302					    net->port, NULL,
8303					    0, 0,
8304					    so_locked))) {
8305						if (error == ENOBUFS) {
8306							asoc->ifp_had_enobuf = 1;
8307							SCTP_STAT_INCR(sctps_lowlevelerr);
8308						}
8309						if (from_where == 0) {
8310							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8311						}
8312						/* error, could not output */
8313						if (hbflag) {
8314							if (*now_filled == 0) {
8315								(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8316								*now_filled = 1;
8317								*now = net->last_sent_time;
8318							} else {
8319								net->last_sent_time = *now;
8320							}
8321							hbflag = 0;
8322						}
8323						if (error == EHOSTUNREACH) {
8324							/*
8325							 * Destination went
8326							 * unreachable
8327							 * during this send
8328							 */
8329							sctp_move_chunks_from_net(stcb, net);
8330						}
8331						*reason_code = 7;
8332						continue;
8333					} else
8334						asoc->ifp_had_enobuf = 0;
8335					/* Only HB or ASCONF advances time */
8336					if (hbflag) {
8337						if (*now_filled == 0) {
8338							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8339							*now_filled = 1;
8340							*now = net->last_sent_time;
8341						} else {
8342							net->last_sent_time = *now;
8343						}
8344						hbflag = 0;
8345					}
8346					/*
8347					 * increase the number we sent, if a
8348					 * cookie is sent we don't tell them
8349					 * any was sent out.
8350					 */
8351					outchain = endoutchain = NULL;
8352					auth = NULL;
8353					auth_offset = 0;
8354					if (!no_out_cnt)
8355						*num_out += ctl_cnt;
8356					/* recalc a clean slate and setup */
8357					switch (net->ro._l_addr.sa.sa_family) {
8358#ifdef INET
8359					case AF_INET:
8360						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8361						break;
8362#endif
8363#ifdef INET6
8364					case AF_INET6:
8365						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8366						break;
8367#endif
8368					default:
8369						/* TSNH */
8370						mtu = net->mtu;
8371						break;
8372					}
8373					to_out = 0;
8374					no_fragmentflg = 1;
8375				}
8376			}
8377		}
8378		/* JRI: if dest is in PF state, do not send data to it */
8379		if ((asoc->sctp_cmt_on_off > 0) &&
8380		    (net != stcb->asoc.alternate) &&
8381		    (net->dest_state & SCTP_ADDR_PF)) {
8382			goto no_data_fill;
8383		}
8384		if (net->flight_size >= net->cwnd) {
8385			goto no_data_fill;
8386		}
8387		if ((asoc->sctp_cmt_on_off > 0) &&
8388		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8389		    (net->flight_size > max_rwnd_per_dest)) {
8390			goto no_data_fill;
8391		}
8392		/*
8393		 * We need a specific accounting for the usage of the send
8394		 * buffer. We also need to check the number of messages per
8395		 * net. For now, this is better than nothing and it disabled
8396		 * by default...
8397		 */
8398		if ((asoc->sctp_cmt_on_off > 0) &&
8399		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8400		    (max_send_per_dest > 0) &&
8401		    (net->flight_size > max_send_per_dest)) {
8402			goto no_data_fill;
8403		}
8404		/*********************/
8405		/* Data transmission */
8406		/*********************/
8407		/*
8408		 * if AUTH for DATA is required and no AUTH has been added
8409		 * yet, account for this in the mtu now... if no data can be
8410		 * bundled, this adjustment won't matter anyways since the
8411		 * packet will be going out...
8412		 */
8413		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8414		    stcb->asoc.peer_auth_chunks);
8415		if (data_auth_reqd && (auth == NULL)) {
8416			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8417		}
8418		/* now lets add any data within the MTU constraints */
8419		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8420#ifdef INET
8421		case AF_INET:
8422			if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8423				omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8424			else
8425				omtu = 0;
8426			break;
8427#endif
8428#ifdef INET6
8429		case AF_INET6:
8430			if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8431				omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8432			else
8433				omtu = 0;
8434			break;
8435#endif
8436		default:
8437			/* TSNH */
8438			omtu = 0;
8439			break;
8440		}
8441		if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8442		    (skip_data_for_this_net == 0)) ||
8443		    (cookie)) {
8444			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8445				if (no_data_chunks) {
8446					/* let only control go out */
8447					*reason_code = 1;
8448					break;
8449				}
8450				if (net->flight_size >= net->cwnd) {
8451					/* skip this net, no room for data */
8452					*reason_code = 2;
8453					break;
8454				}
8455				if ((chk->whoTo != NULL) &&
8456				    (chk->whoTo != net)) {
8457					/* Don't send the chunk on this net */
8458					continue;
8459				}
8460				if (asoc->sctp_cmt_on_off == 0) {
8461					if ((asoc->alternate) &&
8462					    (asoc->alternate != net) &&
8463					    (chk->whoTo == NULL)) {
8464						continue;
8465					} else if ((net != asoc->primary_destination) &&
8466						    (asoc->alternate == NULL) &&
8467					    (chk->whoTo == NULL)) {
8468						continue;
8469					}
8470				}
8471				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8472					/*-
8473					 * strange, we have a chunk that is
8474					 * to big for its destination and
8475					 * yet no fragment ok flag.
8476					 * Something went wrong when the
8477					 * PMTU changed...we did not mark
8478					 * this chunk for some reason?? I
8479					 * will fix it here by letting IP
8480					 * fragment it for now and printing
8481					 * a warning. This really should not
8482					 * happen ...
8483					 */
8484					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8485					    chk->send_size, mtu);
8486					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8487				}
8488				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8489				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8490					struct sctp_data_chunk *dchkh;
8491
8492					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8493					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8494				}
8495				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8496				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8497					/* ok we will add this one */
8498
8499					/*
8500					 * Add an AUTH chunk, if chunk
8501					 * requires it, save the offset into
8502					 * the chain for AUTH
8503					 */
8504					if (data_auth_reqd) {
8505						if (auth == NULL) {
8506							outchain = sctp_add_auth_chunk(outchain,
8507							    &endoutchain,
8508							    &auth,
8509							    &auth_offset,
8510							    stcb,
8511							    SCTP_DATA);
8512							auth_keyid = chk->auth_keyid;
8513							override_ok = 0;
8514							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8515						} else if (override_ok) {
8516							/*
8517							 * use this data's
8518							 * keyid
8519							 */
8520							auth_keyid = chk->auth_keyid;
8521							override_ok = 0;
8522						} else if (auth_keyid != chk->auth_keyid) {
8523							/*
8524							 * different keyid,
8525							 * so done bundling
8526							 */
8527							break;
8528						}
8529					}
8530					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8531					    chk->send_size, chk->copy_by_ref);
8532					if (outchain == NULL) {
8533						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8534						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8535							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8536						}
8537						*reason_code = 3;
8538						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8539						return (ENOMEM);
8540					}
8541					/* upate our MTU size */
8542					/* Do clear IP_DF ? */
8543					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8544						no_fragmentflg = 0;
8545					}
8546					/* unsigned subtraction of mtu */
8547					if (mtu > chk->send_size)
8548						mtu -= chk->send_size;
8549					else
8550						mtu = 0;
8551					/* unsigned subtraction of r_mtu */
8552					if (r_mtu > chk->send_size)
8553						r_mtu -= chk->send_size;
8554					else
8555						r_mtu = 0;
8556
8557					to_out += chk->send_size;
8558					if ((to_out > mx_mtu) && no_fragmentflg) {
8559#ifdef INVARIANTS
8560						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8561#else
8562						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8563						    mx_mtu, to_out);
8564#endif
8565					}
8566					chk->window_probe = 0;
8567					data_list[bundle_at++] = chk;
8568					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8569						break;
8570					}
8571					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8572						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8573							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8574						} else {
8575							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8576						}
8577						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8578						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8579							/*
8580							 * Count number of
8581							 * user msg's that
8582							 * were fragmented
8583							 * we do this by
8584							 * counting when we
8585							 * see a LAST
8586							 * fragment only.
8587							 */
8588							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8589					}
8590					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8591						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8592							data_list[0]->window_probe = 1;
8593							net->window_probe = 1;
8594						}
8595						break;
8596					}
8597				} else {
8598					/*
8599					 * Must be sent in order of the
8600					 * TSN's (on a network)
8601					 */
8602					break;
8603				}
8604			}	/* for (chunk gather loop for this net) */
8605		}		/* if asoc.state OPEN */
8606no_data_fill:
8607		/* Is there something to send for this destination? */
8608		if (outchain) {
8609			/* We may need to start a control timer or two */
8610			if (asconf) {
8611				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8612				    stcb, net);
8613				/*
8614				 * do NOT clear the asconf flag as it is
8615				 * used to do appropriate source address
8616				 * selection.
8617				 */
8618			}
8619			if (cookie) {
8620				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8621				cookie = 0;
8622			}
8623			/* must start a send timer if data is being sent */
8624			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8625				/*
8626				 * no timer running on this destination
8627				 * restart it.
8628				 */
8629				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8630			}
8631			/* Now send it, if there is anything to send :> */
8632			if ((error = sctp_lowlevel_chunk_output(inp,
8633			    stcb,
8634			    net,
8635			    (struct sockaddr *)&net->ro._l_addr,
8636			    outchain,
8637			    auth_offset,
8638			    auth,
8639			    auth_keyid,
8640			    no_fragmentflg,
8641			    bundle_at,
8642			    asconf,
8643			    inp->sctp_lport, stcb->rport,
8644			    htonl(stcb->asoc.peer_vtag),
8645			    net->port, NULL,
8646			    0, 0,
8647			    so_locked))) {
8648				/* error, we could not output */
8649				if (error == ENOBUFS) {
8650					SCTP_STAT_INCR(sctps_lowlevelerr);
8651					asoc->ifp_had_enobuf = 1;
8652				}
8653				if (from_where == 0) {
8654					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8655				}
8656				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8657				if (hbflag) {
8658					if (*now_filled == 0) {
8659						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8660						*now_filled = 1;
8661						*now = net->last_sent_time;
8662					} else {
8663						net->last_sent_time = *now;
8664					}
8665					hbflag = 0;
8666				}
8667				if (error == EHOSTUNREACH) {
8668					/*
8669					 * Destination went unreachable
8670					 * during this send
8671					 */
8672					sctp_move_chunks_from_net(stcb, net);
8673				}
8674				*reason_code = 6;
8675				/*-
8676				 * I add this line to be paranoid. As far as
8677				 * I can tell the continue, takes us back to
8678				 * the top of the for, but just to make sure
8679				 * I will reset these again here.
8680				 */
8681				ctl_cnt = bundle_at = 0;
8682				continue;	/* This takes us back to the
8683						 * for() for the nets. */
8684			} else {
8685				asoc->ifp_had_enobuf = 0;
8686			}
8687			endoutchain = NULL;
8688			auth = NULL;
8689			auth_offset = 0;
8690			if (bundle_at || hbflag) {
8691				/* For data/asconf and hb set time */
8692				if (*now_filled == 0) {
8693					(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8694					*now_filled = 1;
8695					*now = net->last_sent_time;
8696				} else {
8697					net->last_sent_time = *now;
8698				}
8699			}
8700			if (!no_out_cnt) {
8701				*num_out += (ctl_cnt + bundle_at);
8702			}
8703			if (bundle_at) {
8704				/* setup for a RTO measurement */
8705				tsns_sent = data_list[0]->rec.data.TSN_seq;
8706				/* fill time if not already filled */
8707				if (*now_filled == 0) {
8708					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8709					*now_filled = 1;
8710					*now = asoc->time_last_sent;
8711				} else {
8712					asoc->time_last_sent = *now;
8713				}
8714				if (net->rto_needed) {
8715					data_list[0]->do_rtt = 1;
8716					net->rto_needed = 0;
8717				}
8718				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8719				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8720			}
8721			if (one_chunk) {
8722				break;
8723			}
8724		}
8725		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8726			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8727		}
8728	}
8729	if (old_start_at == NULL) {
8730		old_start_at = start_at;
8731		start_at = TAILQ_FIRST(&asoc->nets);
8732		if (old_start_at)
8733			goto again_one_more_time;
8734	}
8735	/*
8736	 * At the end there should be no NON timed chunks hanging on this
8737	 * queue.
8738	 */
8739	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8740		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8741	}
8742	if ((*num_out == 0) && (*reason_code == 0)) {
8743		*reason_code = 4;
8744	} else {
8745		*reason_code = 5;
8746	}
8747	sctp_clean_up_ctl(stcb, asoc, so_locked);
8748	return (0);
8749}
8750
8751void
8752sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8753{
8754	/*-
8755	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8756	 * the control chunk queue.
8757	 */
8758	struct sctp_chunkhdr *hdr;
8759	struct sctp_tmit_chunk *chk;
8760	struct mbuf *mat;
8761
8762	SCTP_TCB_LOCK_ASSERT(stcb);
8763	sctp_alloc_a_chunk(stcb, chk);
8764	if (chk == NULL) {
8765		/* no memory */
8766		sctp_m_freem(op_err);
8767		return;
8768	}
8769	chk->copy_by_ref = 0;
8770	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8771	if (op_err == NULL) {
8772		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8773		return;
8774	}
8775	chk->send_size = 0;
8776	mat = op_err;
8777	while (mat != NULL) {
8778		chk->send_size += SCTP_BUF_LEN(mat);
8779		mat = SCTP_BUF_NEXT(mat);
8780	}
8781	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8782	chk->rec.chunk_id.can_take_data = 1;
8783	chk->sent = SCTP_DATAGRAM_UNSENT;
8784	chk->snd_count = 0;
8785	chk->flags = 0;
8786	chk->asoc = &stcb->asoc;
8787	chk->data = op_err;
8788	chk->whoTo = NULL;
8789	hdr = mtod(op_err, struct sctp_chunkhdr *);
8790	hdr->chunk_type = SCTP_OPERATION_ERROR;
8791	hdr->chunk_flags = 0;
8792	hdr->chunk_length = htons(chk->send_size);
8793	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8794	    chk,
8795	    sctp_next);
8796	chk->asoc->ctrl_queue_cnt++;
8797}
8798
8799int
8800sctp_send_cookie_echo(struct mbuf *m,
8801    int offset,
8802    struct sctp_tcb *stcb,
8803    struct sctp_nets *net)
8804{
8805	/*-
8806	 * pull out the cookie and put it at the front of the control chunk
8807	 * queue.
8808	 */
8809	int at;
8810	struct mbuf *cookie;
8811	struct sctp_paramhdr parm, *phdr;
8812	struct sctp_chunkhdr *hdr;
8813	struct sctp_tmit_chunk *chk;
8814	uint16_t ptype, plen;
8815
8816	/* First find the cookie in the param area */
8817	cookie = NULL;
8818	at = offset + sizeof(struct sctp_init_chunk);
8819
8820	SCTP_TCB_LOCK_ASSERT(stcb);
8821	do {
8822		phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8823		if (phdr == NULL) {
8824			return (-3);
8825		}
8826		ptype = ntohs(phdr->param_type);
8827		plen = ntohs(phdr->param_length);
8828		if (ptype == SCTP_STATE_COOKIE) {
8829			int pad;
8830
8831			/* found the cookie */
8832			if ((pad = (plen % 4))) {
8833				plen += 4 - pad;
8834			}
8835			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8836			if (cookie == NULL) {
8837				/* No memory */
8838				return (-2);
8839			}
8840#ifdef SCTP_MBUF_LOGGING
8841			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8842				struct mbuf *mat;
8843
8844				for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8845					if (SCTP_BUF_IS_EXTENDED(mat)) {
8846						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8847					}
8848				}
8849			}
8850#endif
8851			break;
8852		}
8853		at += SCTP_SIZE32(plen);
8854	} while (phdr);
8855	if (cookie == NULL) {
8856		/* Did not find the cookie */
8857		return (-3);
8858	}
8859	/* ok, we got the cookie lets change it into a cookie echo chunk */
8860
8861	/* first the change from param to cookie */
8862	hdr = mtod(cookie, struct sctp_chunkhdr *);
8863	hdr->chunk_type = SCTP_COOKIE_ECHO;
8864	hdr->chunk_flags = 0;
8865	/* get the chunk stuff now and place it in the FRONT of the queue */
8866	sctp_alloc_a_chunk(stcb, chk);
8867	if (chk == NULL) {
8868		/* no memory */
8869		sctp_m_freem(cookie);
8870		return (-5);
8871	}
8872	chk->copy_by_ref = 0;
8873	chk->send_size = plen;
8874	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8875	chk->rec.chunk_id.can_take_data = 0;
8876	chk->sent = SCTP_DATAGRAM_UNSENT;
8877	chk->snd_count = 0;
8878	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8879	chk->asoc = &stcb->asoc;
8880	chk->data = cookie;
8881	chk->whoTo = net;
8882	atomic_add_int(&chk->whoTo->ref_count, 1);
8883	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8884	chk->asoc->ctrl_queue_cnt++;
8885	return (0);
8886}
8887
8888void
8889sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8890    struct mbuf *m,
8891    int offset,
8892    int chk_length,
8893    struct sctp_nets *net)
8894{
8895	/*
8896	 * take a HB request and make it into a HB ack and send it.
8897	 */
8898	struct mbuf *outchain;
8899	struct sctp_chunkhdr *chdr;
8900	struct sctp_tmit_chunk *chk;
8901
8902
8903	if (net == NULL)
8904		/* must have a net pointer */
8905		return;
8906
8907	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
8908	if (outchain == NULL) {
8909		/* gak out of memory */
8910		return;
8911	}
8912#ifdef SCTP_MBUF_LOGGING
8913	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8914		struct mbuf *mat;
8915
8916		for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8917			if (SCTP_BUF_IS_EXTENDED(mat)) {
8918				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8919			}
8920		}
8921	}
8922#endif
8923	chdr = mtod(outchain, struct sctp_chunkhdr *);
8924	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8925	chdr->chunk_flags = 0;
8926	if (chk_length % 4) {
8927		/* need pad */
8928		uint32_t cpthis = 0;
8929		int padlen;
8930
8931		padlen = 4 - (chk_length % 4);
8932		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8933	}
8934	sctp_alloc_a_chunk(stcb, chk);
8935	if (chk == NULL) {
8936		/* no memory */
8937		sctp_m_freem(outchain);
8938		return;
8939	}
8940	chk->copy_by_ref = 0;
8941	chk->send_size = chk_length;
8942	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8943	chk->rec.chunk_id.can_take_data = 1;
8944	chk->sent = SCTP_DATAGRAM_UNSENT;
8945	chk->snd_count = 0;
8946	chk->flags = 0;
8947	chk->asoc = &stcb->asoc;
8948	chk->data = outchain;
8949	chk->whoTo = net;
8950	atomic_add_int(&chk->whoTo->ref_count, 1);
8951	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8952	chk->asoc->ctrl_queue_cnt++;
8953}
8954
8955void
8956sctp_send_cookie_ack(struct sctp_tcb *stcb)
8957{
8958	/* formulate and queue a cookie-ack back to sender */
8959	struct mbuf *cookie_ack;
8960	struct sctp_chunkhdr *hdr;
8961	struct sctp_tmit_chunk *chk;
8962
8963	cookie_ack = NULL;
8964	SCTP_TCB_LOCK_ASSERT(stcb);
8965
8966	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
8967	if (cookie_ack == NULL) {
8968		/* no mbuf's */
8969		return;
8970	}
8971	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8972	sctp_alloc_a_chunk(stcb, chk);
8973	if (chk == NULL) {
8974		/* no memory */
8975		sctp_m_freem(cookie_ack);
8976		return;
8977	}
8978	chk->copy_by_ref = 0;
8979	chk->send_size = sizeof(struct sctp_chunkhdr);
8980	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8981	chk->rec.chunk_id.can_take_data = 1;
8982	chk->sent = SCTP_DATAGRAM_UNSENT;
8983	chk->snd_count = 0;
8984	chk->flags = 0;
8985	chk->asoc = &stcb->asoc;
8986	chk->data = cookie_ack;
8987	if (chk->asoc->last_control_chunk_from != NULL) {
8988		chk->whoTo = chk->asoc->last_control_chunk_from;
8989		atomic_add_int(&chk->whoTo->ref_count, 1);
8990	} else {
8991		chk->whoTo = NULL;
8992	}
8993	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8994	hdr->chunk_type = SCTP_COOKIE_ACK;
8995	hdr->chunk_flags = 0;
8996	hdr->chunk_length = htons(chk->send_size);
8997	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8998	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8999	chk->asoc->ctrl_queue_cnt++;
9000	return;
9001}
9002
9003
9004void
9005sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9006{
9007	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9008	struct mbuf *m_shutdown_ack;
9009	struct sctp_shutdown_ack_chunk *ack_cp;
9010	struct sctp_tmit_chunk *chk;
9011
9012	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9013	if (m_shutdown_ack == NULL) {
9014		/* no mbuf's */
9015		return;
9016	}
9017	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9018	sctp_alloc_a_chunk(stcb, chk);
9019	if (chk == NULL) {
9020		/* no memory */
9021		sctp_m_freem(m_shutdown_ack);
9022		return;
9023	}
9024	chk->copy_by_ref = 0;
9025	chk->send_size = sizeof(struct sctp_chunkhdr);
9026	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9027	chk->rec.chunk_id.can_take_data = 1;
9028	chk->sent = SCTP_DATAGRAM_UNSENT;
9029	chk->snd_count = 0;
9030	chk->flags = 0;
9031	chk->asoc = &stcb->asoc;
9032	chk->data = m_shutdown_ack;
9033	chk->whoTo = net;
9034	if (chk->whoTo) {
9035		atomic_add_int(&chk->whoTo->ref_count, 1);
9036	}
9037	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9038	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9039	ack_cp->ch.chunk_flags = 0;
9040	ack_cp->ch.chunk_length = htons(chk->send_size);
9041	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9042	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9043	chk->asoc->ctrl_queue_cnt++;
9044	return;
9045}
9046
9047void
9048sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9049{
9050	/* formulate and queue a SHUTDOWN to the sender */
9051	struct mbuf *m_shutdown;
9052	struct sctp_shutdown_chunk *shutdown_cp;
9053	struct sctp_tmit_chunk *chk;
9054
9055	m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9056	if (m_shutdown == NULL) {
9057		/* no mbuf's */
9058		return;
9059	}
9060	SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9061	sctp_alloc_a_chunk(stcb, chk);
9062	if (chk == NULL) {
9063		/* no memory */
9064		sctp_m_freem(m_shutdown);
9065		return;
9066	}
9067	chk->copy_by_ref = 0;
9068	chk->send_size = sizeof(struct sctp_shutdown_chunk);
9069	chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9070	chk->rec.chunk_id.can_take_data = 1;
9071	chk->sent = SCTP_DATAGRAM_UNSENT;
9072	chk->snd_count = 0;
9073	chk->flags = 0;
9074	chk->asoc = &stcb->asoc;
9075	chk->data = m_shutdown;
9076	chk->whoTo = net;
9077	if (chk->whoTo) {
9078		atomic_add_int(&chk->whoTo->ref_count, 1);
9079	}
9080	shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9081	shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9082	shutdown_cp->ch.chunk_flags = 0;
9083	shutdown_cp->ch.chunk_length = htons(chk->send_size);
9084	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9085	SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9086	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9087	chk->asoc->ctrl_queue_cnt++;
9088	return;
9089}
9090
9091void
9092sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9093{
9094	/*
9095	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9096	 * should be queued on the assoc queue.
9097	 */
9098	struct sctp_tmit_chunk *chk;
9099	struct mbuf *m_asconf;
9100	int len;
9101
9102	SCTP_TCB_LOCK_ASSERT(stcb);
9103
9104	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9105	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9106		/* can't send a new one if there is one in flight already */
9107		return;
9108	}
9109	/* compose an ASCONF chunk, maximum length is PMTU */
9110	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9111	if (m_asconf == NULL) {
9112		return;
9113	}
9114	sctp_alloc_a_chunk(stcb, chk);
9115	if (chk == NULL) {
9116		/* no memory */
9117		sctp_m_freem(m_asconf);
9118		return;
9119	}
9120	chk->copy_by_ref = 0;
9121	chk->data = m_asconf;
9122	chk->send_size = len;
9123	chk->rec.chunk_id.id = SCTP_ASCONF;
9124	chk->rec.chunk_id.can_take_data = 0;
9125	chk->sent = SCTP_DATAGRAM_UNSENT;
9126	chk->snd_count = 0;
9127	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9128	chk->asoc = &stcb->asoc;
9129	chk->whoTo = net;
9130	if (chk->whoTo) {
9131		atomic_add_int(&chk->whoTo->ref_count, 1);
9132	}
9133	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9134	chk->asoc->ctrl_queue_cnt++;
9135	return;
9136}
9137
9138void
9139sctp_send_asconf_ack(struct sctp_tcb *stcb)
9140{
9141	/*
9142	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9143	 * must be stored in the tcb.
9144	 */
9145	struct sctp_tmit_chunk *chk;
9146	struct sctp_asconf_ack *ack, *latest_ack;
9147	struct mbuf *m_ack;
9148	struct sctp_nets *net = NULL;
9149
9150	SCTP_TCB_LOCK_ASSERT(stcb);
9151	/* Get the latest ASCONF-ACK */
9152	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9153	if (latest_ack == NULL) {
9154		return;
9155	}
9156	if (latest_ack->last_sent_to != NULL &&
9157	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9158		/* we're doing a retransmission */
9159		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9160		if (net == NULL) {
9161			/* no alternate */
9162			if (stcb->asoc.last_control_chunk_from == NULL) {
9163				if (stcb->asoc.alternate) {
9164					net = stcb->asoc.alternate;
9165				} else {
9166					net = stcb->asoc.primary_destination;
9167				}
9168			} else {
9169				net = stcb->asoc.last_control_chunk_from;
9170			}
9171		}
9172	} else {
9173		/* normal case */
9174		if (stcb->asoc.last_control_chunk_from == NULL) {
9175			if (stcb->asoc.alternate) {
9176				net = stcb->asoc.alternate;
9177			} else {
9178				net = stcb->asoc.primary_destination;
9179			}
9180		} else {
9181			net = stcb->asoc.last_control_chunk_from;
9182		}
9183	}
9184	latest_ack->last_sent_to = net;
9185
9186	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9187		if (ack->data == NULL) {
9188			continue;
9189		}
9190		/* copy the asconf_ack */
9191		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9192		if (m_ack == NULL) {
9193			/* couldn't copy it */
9194			return;
9195		}
9196#ifdef SCTP_MBUF_LOGGING
9197		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9198			struct mbuf *mat;
9199
9200			for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9201				if (SCTP_BUF_IS_EXTENDED(mat)) {
9202					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9203				}
9204			}
9205		}
9206#endif
9207
9208		sctp_alloc_a_chunk(stcb, chk);
9209		if (chk == NULL) {
9210			/* no memory */
9211			if (m_ack)
9212				sctp_m_freem(m_ack);
9213			return;
9214		}
9215		chk->copy_by_ref = 0;
9216
9217		chk->whoTo = net;
9218		if (chk->whoTo) {
9219			atomic_add_int(&chk->whoTo->ref_count, 1);
9220		}
9221		chk->data = m_ack;
9222		chk->send_size = 0;
9223		/* Get size */
9224		chk->send_size = ack->len;
9225		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9226		chk->rec.chunk_id.can_take_data = 1;
9227		chk->sent = SCTP_DATAGRAM_UNSENT;
9228		chk->snd_count = 0;
9229		chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;	/* XXX */
9230		chk->asoc = &stcb->asoc;
9231
9232		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9233		chk->asoc->ctrl_queue_cnt++;
9234	}
9235	return;
9236}
9237
9238
9239static int
9240sctp_chunk_retransmission(struct sctp_inpcb *inp,
9241    struct sctp_tcb *stcb,
9242    struct sctp_association *asoc,
9243    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9244#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9245    SCTP_UNUSED
9246#endif
9247)
9248{
9249	/*-
9250	 * send out one MTU of retransmission. If fast_retransmit is
9251	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9252	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9253	 * retransmit them by themselves.
9254	 *
9255	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9256	 * marked for resend and bundle them all together (up to a MTU of
9257	 * destination). The address to send to should have been
9258	 * selected/changed where the retransmission was marked (i.e. in FR
9259	 * or t3-timeout routines).
9260	 */
9261	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9262	struct sctp_tmit_chunk *chk, *fwd;
9263	struct mbuf *m, *endofchain;
9264	struct sctp_nets *net = NULL;
9265	uint32_t tsns_sent = 0;
9266	int no_fragmentflg, bundle_at, cnt_thru;
9267	unsigned int mtu;
9268	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9269	struct sctp_auth_chunk *auth = NULL;
9270	uint32_t auth_offset = 0;
9271	uint16_t auth_keyid;
9272	int override_ok = 1;
9273	int data_auth_reqd = 0;
9274	uint32_t dmtu = 0;
9275
9276	SCTP_TCB_LOCK_ASSERT(stcb);
9277	tmr_started = ctl_cnt = bundle_at = error = 0;
9278	no_fragmentflg = 1;
9279	fwd_tsn = 0;
9280	*cnt_out = 0;
9281	fwd = NULL;
9282	endofchain = m = NULL;
9283	auth_keyid = stcb->asoc.authinfo.active_keyid;
9284#ifdef SCTP_AUDITING_ENABLED
9285	sctp_audit_log(0xC3, 1);
9286#endif
9287	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9288	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9289		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9290		    asoc->sent_queue_retran_cnt);
9291		asoc->sent_queue_cnt = 0;
9292		asoc->sent_queue_cnt_removeable = 0;
9293		/* send back 0/0 so we enter normal transmission */
9294		*cnt_out = 0;
9295		return (0);
9296	}
9297	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9298		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9299		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9300		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9301			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9302				continue;
9303			}
9304			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9305				if (chk != asoc->str_reset) {
9306					/*
9307					 * not eligible for retran if its
9308					 * not ours
9309					 */
9310					continue;
9311				}
9312			}
9313			ctl_cnt++;
9314			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9315				fwd_tsn = 1;
9316			}
9317			/*
9318			 * Add an AUTH chunk, if chunk requires it save the
9319			 * offset into the chain for AUTH
9320			 */
9321			if ((auth == NULL) &&
9322			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9323			    stcb->asoc.peer_auth_chunks))) {
9324				m = sctp_add_auth_chunk(m, &endofchain,
9325				    &auth, &auth_offset,
9326				    stcb,
9327				    chk->rec.chunk_id.id);
9328				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9329			}
9330			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9331			break;
9332		}
9333	}
9334	one_chunk = 0;
9335	cnt_thru = 0;
9336	/* do we have control chunks to retransmit? */
9337	if (m != NULL) {
9338		/* Start a timer no matter if we suceed or fail */
9339		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9340			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9341		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9342			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9343		chk->snd_count++;	/* update our count */
9344		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9345		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9346		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9347		    no_fragmentflg, 0, 0,
9348		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9349		    chk->whoTo->port, NULL,
9350		    0, 0,
9351		    so_locked))) {
9352			SCTP_STAT_INCR(sctps_lowlevelerr);
9353			return (error);
9354		}
9355		endofchain = NULL;
9356		auth = NULL;
9357		auth_offset = 0;
9358		/*
9359		 * We don't want to mark the net->sent time here since this
9360		 * we use this for HB and retrans cannot measure RTT
9361		 */
9362		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9363		*cnt_out += 1;
9364		chk->sent = SCTP_DATAGRAM_SENT;
9365		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9366		if (fwd_tsn == 0) {
9367			return (0);
9368		} else {
9369			/* Clean up the fwd-tsn list */
9370			sctp_clean_up_ctl(stcb, asoc, so_locked);
9371			return (0);
9372		}
9373	}
9374	/*
9375	 * Ok, it is just data retransmission we need to do or that and a
9376	 * fwd-tsn with it all.
9377	 */
9378	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9379		return (SCTP_RETRAN_DONE);
9380	}
9381	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9382	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9383		/* not yet open, resend the cookie and that is it */
9384		return (1);
9385	}
9386#ifdef SCTP_AUDITING_ENABLED
9387	sctp_auditing(20, inp, stcb, NULL);
9388#endif
9389	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9390	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9391		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9392			/* No, not sent to this net or not ready for rtx */
9393			continue;
9394		}
9395		if (chk->data == NULL) {
9396			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9397			    chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9398			continue;
9399		}
9400		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9401		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9402			/* Gak, we have exceeded max unlucky retran, abort! */
9403			SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9404			    chk->snd_count,
9405			    SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9406			atomic_add_int(&stcb->asoc.refcnt, 1);
9407			sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9408			SCTP_TCB_LOCK(stcb);
9409			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9410			return (SCTP_RETRAN_EXIT);
9411		}
9412		/* pick up the net */
9413		net = chk->whoTo;
9414		switch (net->ro._l_addr.sa.sa_family) {
9415#ifdef INET
9416		case AF_INET:
9417			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9418			break;
9419#endif
9420#ifdef INET6
9421		case AF_INET6:
9422			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9423			break;
9424#endif
9425		default:
9426			/* TSNH */
9427			mtu = net->mtu;
9428			break;
9429		}
9430
9431		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9432			/* No room in peers rwnd */
9433			uint32_t tsn;
9434
9435			tsn = asoc->last_acked_seq + 1;
9436			if (tsn == chk->rec.data.TSN_seq) {
9437				/*
9438				 * we make a special exception for this
9439				 * case. The peer has no rwnd but is missing
9440				 * the lowest chunk.. which is probably what
9441				 * is holding up the rwnd.
9442				 */
9443				goto one_chunk_around;
9444			}
9445			return (1);
9446		}
9447one_chunk_around:
9448		if (asoc->peers_rwnd < mtu) {
9449			one_chunk = 1;
9450			if ((asoc->peers_rwnd == 0) &&
9451			    (asoc->total_flight == 0)) {
9452				chk->window_probe = 1;
9453				chk->whoTo->window_probe = 1;
9454			}
9455		}
9456#ifdef SCTP_AUDITING_ENABLED
9457		sctp_audit_log(0xC3, 2);
9458#endif
9459		bundle_at = 0;
9460		m = NULL;
9461		net->fast_retran_ip = 0;
9462		if (chk->rec.data.doing_fast_retransmit == 0) {
9463			/*
9464			 * if no FR in progress skip destination that have
9465			 * flight_size > cwnd.
9466			 */
9467			if (net->flight_size >= net->cwnd) {
9468				continue;
9469			}
9470		} else {
9471			/*
9472			 * Mark the destination net to have FR recovery
9473			 * limits put on it.
9474			 */
9475			*fr_done = 1;
9476			net->fast_retran_ip = 1;
9477		}
9478
9479		/*
9480		 * if no AUTH is yet included and this chunk requires it,
9481		 * make sure to account for it.  We don't apply the size
9482		 * until the AUTH chunk is actually added below in case
9483		 * there is no room for this chunk.
9484		 */
9485		if (data_auth_reqd && (auth == NULL)) {
9486			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9487		} else
9488			dmtu = 0;
9489
9490		if ((chk->send_size <= (mtu - dmtu)) ||
9491		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9492			/* ok we will add this one */
9493			if (data_auth_reqd) {
9494				if (auth == NULL) {
9495					m = sctp_add_auth_chunk(m,
9496					    &endofchain,
9497					    &auth,
9498					    &auth_offset,
9499					    stcb,
9500					    SCTP_DATA);
9501					auth_keyid = chk->auth_keyid;
9502					override_ok = 0;
9503					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9504				} else if (override_ok) {
9505					auth_keyid = chk->auth_keyid;
9506					override_ok = 0;
9507				} else if (chk->auth_keyid != auth_keyid) {
9508					/* different keyid, so done bundling */
9509					break;
9510				}
9511			}
9512			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9513			if (m == NULL) {
9514				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9515				return (ENOMEM);
9516			}
9517			/* Do clear IP_DF ? */
9518			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9519				no_fragmentflg = 0;
9520			}
9521			/* upate our MTU size */
9522			if (mtu > (chk->send_size + dmtu))
9523				mtu -= (chk->send_size + dmtu);
9524			else
9525				mtu = 0;
9526			data_list[bundle_at++] = chk;
9527			if (one_chunk && (asoc->total_flight <= 0)) {
9528				SCTP_STAT_INCR(sctps_windowprobed);
9529			}
9530		}
9531		if (one_chunk == 0) {
9532			/*
9533			 * now are there anymore forward from chk to pick
9534			 * up?
9535			 */
9536			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9537				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9538					/* Nope, not for retran */
9539					continue;
9540				}
9541				if (fwd->whoTo != net) {
9542					/* Nope, not the net in question */
9543					continue;
9544				}
9545				if (data_auth_reqd && (auth == NULL)) {
9546					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9547				} else
9548					dmtu = 0;
9549				if (fwd->send_size <= (mtu - dmtu)) {
9550					if (data_auth_reqd) {
9551						if (auth == NULL) {
9552							m = sctp_add_auth_chunk(m,
9553							    &endofchain,
9554							    &auth,
9555							    &auth_offset,
9556							    stcb,
9557							    SCTP_DATA);
9558							auth_keyid = fwd->auth_keyid;
9559							override_ok = 0;
9560							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9561						} else if (override_ok) {
9562							auth_keyid = fwd->auth_keyid;
9563							override_ok = 0;
9564						} else if (fwd->auth_keyid != auth_keyid) {
9565							/*
9566							 * different keyid,
9567							 * so done bundling
9568							 */
9569							break;
9570						}
9571					}
9572					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9573					if (m == NULL) {
9574						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9575						return (ENOMEM);
9576					}
9577					/* Do clear IP_DF ? */
9578					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9579						no_fragmentflg = 0;
9580					}
9581					/* upate our MTU size */
9582					if (mtu > (fwd->send_size + dmtu))
9583						mtu -= (fwd->send_size + dmtu);
9584					else
9585						mtu = 0;
9586					data_list[bundle_at++] = fwd;
9587					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9588						break;
9589					}
9590				} else {
9591					/* can't fit so we are done */
9592					break;
9593				}
9594			}
9595		}
9596		/* Is there something to send for this destination? */
9597		if (m) {
9598			/*
9599			 * No matter if we fail/or suceed we should start a
9600			 * timer. A failure is like a lost IP packet :-)
9601			 */
9602			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9603				/*
9604				 * no timer running on this destination
9605				 * restart it.
9606				 */
9607				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9608				tmr_started = 1;
9609			}
9610			/* Now lets send it, if there is anything to send :> */
9611			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9612			    (struct sockaddr *)&net->ro._l_addr, m,
9613			    auth_offset, auth, auth_keyid,
9614			    no_fragmentflg, 0, 0,
9615			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9616			    net->port, NULL,
9617			    0, 0,
9618			    so_locked))) {
9619				/* error, we could not output */
9620				SCTP_STAT_INCR(sctps_lowlevelerr);
9621				return (error);
9622			}
9623			endofchain = NULL;
9624			auth = NULL;
9625			auth_offset = 0;
9626			/* For HB's */
9627			/*
9628			 * We don't want to mark the net->sent time here
9629			 * since this we use this for HB and retrans cannot
9630			 * measure RTT
9631			 */
9632			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9633
9634			/* For auto-close */
9635			cnt_thru++;
9636			if (*now_filled == 0) {
9637				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9638				*now = asoc->time_last_sent;
9639				*now_filled = 1;
9640			} else {
9641				asoc->time_last_sent = *now;
9642			}
9643			*cnt_out += bundle_at;
9644#ifdef SCTP_AUDITING_ENABLED
9645			sctp_audit_log(0xC4, bundle_at);
9646#endif
9647			if (bundle_at) {
9648				tsns_sent = data_list[0]->rec.data.TSN_seq;
9649			}
9650			for (i = 0; i < bundle_at; i++) {
9651				SCTP_STAT_INCR(sctps_sendretransdata);
9652				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9653				/*
9654				 * When we have a revoked data, and we
9655				 * retransmit it, then we clear the revoked
9656				 * flag since this flag dictates if we
9657				 * subtracted from the fs
9658				 */
9659				if (data_list[i]->rec.data.chunk_was_revoked) {
9660					/* Deflate the cwnd */
9661					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9662					data_list[i]->rec.data.chunk_was_revoked = 0;
9663				}
9664				data_list[i]->snd_count++;
9665				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9666				/* record the time */
9667				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9668				if (data_list[i]->book_size_scale) {
9669					/*
9670					 * need to double the book size on
9671					 * this one
9672					 */
9673					data_list[i]->book_size_scale = 0;
9674					/*
9675					 * Since we double the booksize, we
9676					 * must also double the output queue
9677					 * size, since this get shrunk when
9678					 * we free by this amount.
9679					 */
9680					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9681					data_list[i]->book_size *= 2;
9682
9683
9684				} else {
9685					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9686						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9687						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9688					}
9689					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9690					    (uint32_t) (data_list[i]->send_size +
9691					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9692				}
9693				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9694					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9695					    data_list[i]->whoTo->flight_size,
9696					    data_list[i]->book_size,
9697					    (uintptr_t) data_list[i]->whoTo,
9698					    data_list[i]->rec.data.TSN_seq);
9699				}
9700				sctp_flight_size_increase(data_list[i]);
9701				sctp_total_flight_increase(stcb, data_list[i]);
9702				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9703					/* SWS sender side engages */
9704					asoc->peers_rwnd = 0;
9705				}
9706				if ((i == 0) &&
9707				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9708					SCTP_STAT_INCR(sctps_sendfastretrans);
9709					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9710					    (tmr_started == 0)) {
9711						/*-
9712						 * ok we just fast-retrans'd
9713						 * the lowest TSN, i.e the
9714						 * first on the list. In
9715						 * this case we want to give
9716						 * some more time to get a
9717						 * SACK back without a
9718						 * t3-expiring.
9719						 */
9720						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9721						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9722						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9723					}
9724				}
9725			}
9726			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9727				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9728			}
9729#ifdef SCTP_AUDITING_ENABLED
9730			sctp_auditing(21, inp, stcb, NULL);
9731#endif
9732		} else {
9733			/* None will fit */
9734			return (1);
9735		}
9736		if (asoc->sent_queue_retran_cnt <= 0) {
9737			/* all done we have no more to retran */
9738			asoc->sent_queue_retran_cnt = 0;
9739			break;
9740		}
9741		if (one_chunk) {
9742			/* No more room in rwnd */
9743			return (1);
9744		}
9745		/* stop the for loop here. we sent out a packet */
9746		break;
9747	}
9748	return (0);
9749}
9750
9751static void
9752sctp_timer_validation(struct sctp_inpcb *inp,
9753    struct sctp_tcb *stcb,
9754    struct sctp_association *asoc)
9755{
9756	struct sctp_nets *net;
9757
9758	/* Validate that a timer is running somewhere */
9759	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9760		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9761			/* Here is a timer */
9762			return;
9763		}
9764	}
9765	SCTP_TCB_LOCK_ASSERT(stcb);
9766	/* Gak, we did not have a timer somewhere */
9767	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9768	if (asoc->alternate) {
9769		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9770	} else {
9771		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9772	}
9773	return;
9774}
9775
9776void
9777sctp_chunk_output(struct sctp_inpcb *inp,
9778    struct sctp_tcb *stcb,
9779    int from_where,
9780    int so_locked
9781#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9782    SCTP_UNUSED
9783#endif
9784)
9785{
9786	/*-
9787	 * Ok this is the generic chunk service queue. we must do the
9788	 * following:
9789	 * - See if there are retransmits pending, if so we must
9790	 *   do these first.
9791	 * - Service the stream queue that is next, moving any
9792	 *   message (note I must get a complete message i.e.
9793	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9794	 *   TSN's
9795	 * - Check to see if the cwnd/rwnd allows any output, if so we
9796	 *   go ahead and fomulate and send the low level chunks. Making sure
9797	 *   to combine any control in the control chunk queue also.
9798	 */
9799	struct sctp_association *asoc;
9800	struct sctp_nets *net;
9801	int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9802	unsigned int burst_cnt = 0;
9803	struct timeval now;
9804	int now_filled = 0;
9805	int nagle_on;
9806	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9807	int un_sent = 0;
9808	int fr_done;
9809	unsigned int tot_frs = 0;
9810
9811	asoc = &stcb->asoc;
9812	/* The Nagle algorithm is only applied when handling a send call. */
9813	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9814		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9815			nagle_on = 0;
9816		} else {
9817			nagle_on = 1;
9818		}
9819	} else {
9820		nagle_on = 0;
9821	}
9822	SCTP_TCB_LOCK_ASSERT(stcb);
9823
9824	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9825
9826	if ((un_sent <= 0) &&
9827	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9828	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9829	    (asoc->sent_queue_retran_cnt == 0)) {
9830		/* Nothing to do unless there is something to be sent left */
9831		return;
9832	}
9833	/*
9834	 * Do we have something to send, data or control AND a sack timer
9835	 * running, if so piggy-back the sack.
9836	 */
9837	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9838		sctp_send_sack(stcb, so_locked);
9839		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9840	}
9841	while (asoc->sent_queue_retran_cnt) {
9842		/*-
9843		 * Ok, it is retransmission time only, we send out only ONE
9844		 * packet with a single call off to the retran code.
9845		 */
9846		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9847			/*-
9848			 * Special hook for handling cookiess discarded
9849			 * by peer that carried data. Send cookie-ack only
9850			 * and then the next call with get the retran's.
9851			 */
9852			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9853			    from_where,
9854			    &now, &now_filled, frag_point, so_locked);
9855			return;
9856		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9857			/* if its not from a HB then do it */
9858			fr_done = 0;
9859			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9860			if (fr_done) {
9861				tot_frs++;
9862			}
9863		} else {
9864			/*
9865			 * its from any other place, we don't allow retran
9866			 * output (only control)
9867			 */
9868			ret = 1;
9869		}
9870		if (ret > 0) {
9871			/* Can't send anymore */
9872			/*-
9873			 * now lets push out control by calling med-level
9874			 * output once. this assures that we WILL send HB's
9875			 * if queued too.
9876			 */
9877			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9878			    from_where,
9879			    &now, &now_filled, frag_point, so_locked);
9880#ifdef SCTP_AUDITING_ENABLED
9881			sctp_auditing(8, inp, stcb, NULL);
9882#endif
9883			sctp_timer_validation(inp, stcb, asoc);
9884			return;
9885		}
9886		if (ret < 0) {
9887			/*-
9888			 * The count was off.. retran is not happening so do
9889			 * the normal retransmission.
9890			 */
9891#ifdef SCTP_AUDITING_ENABLED
9892			sctp_auditing(9, inp, stcb, NULL);
9893#endif
9894			if (ret == SCTP_RETRAN_EXIT) {
9895				return;
9896			}
9897			break;
9898		}
9899		if (from_where == SCTP_OUTPUT_FROM_T3) {
9900			/* Only one transmission allowed out of a timeout */
9901#ifdef SCTP_AUDITING_ENABLED
9902			sctp_auditing(10, inp, stcb, NULL);
9903#endif
9904			/* Push out any control */
9905			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9906			    &now, &now_filled, frag_point, so_locked);
9907			return;
9908		}
9909		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9910			/* Hit FR burst limit */
9911			return;
9912		}
9913		if ((num_out == 0) && (ret == 0)) {
9914			/* No more retrans to send */
9915			break;
9916		}
9917	}
9918#ifdef SCTP_AUDITING_ENABLED
9919	sctp_auditing(12, inp, stcb, NULL);
9920#endif
9921	/* Check for bad destinations, if they exist move chunks around. */
9922	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9923		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9924			/*-
9925			 * if possible move things off of this address we
9926			 * still may send below due to the dormant state but
9927			 * we try to find an alternate address to send to
9928			 * and if we have one we move all queued data on the
9929			 * out wheel to this alternate address.
9930			 */
9931			if (net->ref_count > 1)
9932				sctp_move_chunks_from_net(stcb, net);
9933		} else {
9934			/*-
9935			 * if ((asoc->sat_network) || (net->addr_is_local))
9936			 * { burst_limit = asoc->max_burst *
9937			 * SCTP_SAT_NETWORK_BURST_INCR; }
9938			 */
9939			if (asoc->max_burst > 0) {
9940				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9941					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9942						/*
9943						 * JRS - Use the congestion
9944						 * control given in the
9945						 * congestion control module
9946						 */
9947						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9948						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9949							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9950						}
9951						SCTP_STAT_INCR(sctps_maxburstqueued);
9952					}
9953					net->fast_retran_ip = 0;
9954				} else {
9955					if (net->flight_size == 0) {
9956						/*
9957						 * Should be decaying the
9958						 * cwnd here
9959						 */
9960						;
9961					}
9962				}
9963			}
9964		}
9965
9966	}
9967	burst_cnt = 0;
9968	do {
9969		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9970		    &reason_code, 0, from_where,
9971		    &now, &now_filled, frag_point, so_locked);
9972		if (error) {
9973			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9974			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9975				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9976			}
9977			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9978				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9979				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9980			}
9981			break;
9982		}
9983		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9984
9985		tot_out += num_out;
9986		burst_cnt++;
9987		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9988			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9989			if (num_out == 0) {
9990				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9991			}
9992		}
9993		if (nagle_on) {
9994			/*
9995			 * When the Nagle algorithm is used, look at how
9996			 * much is unsent, then if its smaller than an MTU
9997			 * and we have data in flight we stop, except if we
9998			 * are handling a fragmented user message.
9999			 */
10000			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10001			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10002			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10003			    (stcb->asoc.total_flight > 0) &&
10004			    ((stcb->asoc.locked_on_sending == NULL) ||
10005			    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10006				break;
10007			}
10008		}
10009		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10010		    TAILQ_EMPTY(&asoc->send_queue) &&
10011		    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10012			/* Nothing left to send */
10013			break;
10014		}
10015		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10016			/* Nothing left to send */
10017			break;
10018		}
10019	} while (num_out &&
10020	    ((asoc->max_burst == 0) ||
10021	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10022	    (burst_cnt < asoc->max_burst)));
10023
10024	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10025		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10026			SCTP_STAT_INCR(sctps_maxburstqueued);
10027			asoc->burst_limit_applied = 1;
10028			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10029				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10030			}
10031		} else {
10032			asoc->burst_limit_applied = 0;
10033		}
10034	}
10035	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10036		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10037	}
10038	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10039	    tot_out);
10040
10041	/*-
10042	 * Now we need to clean up the control chunk chain if a ECNE is on
10043	 * it. It must be marked as UNSENT again so next call will continue
10044	 * to send it until such time that we get a CWR, to remove it.
10045	 */
10046	if (stcb->asoc.ecn_echo_cnt_onq)
10047		sctp_fix_ecn_echo(asoc);
10048	return;
10049}
10050
10051
10052int
10053sctp_output(
10054    struct sctp_inpcb *inp,
10055    struct mbuf *m,
10056    struct sockaddr *addr,
10057    struct mbuf *control,
10058    struct thread *p,
10059    int flags)
10060{
10061	if (inp == NULL) {
10062		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10063		return (EINVAL);
10064	}
10065	if (inp->sctp_socket == NULL) {
10066		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10067		return (EINVAL);
10068	}
10069	return (sctp_sosend(inp->sctp_socket,
10070	    addr,
10071	    (struct uio *)NULL,
10072	    m,
10073	    control,
10074	    flags, p
10075	    ));
10076}
10077
10078void
10079send_forward_tsn(struct sctp_tcb *stcb,
10080    struct sctp_association *asoc)
10081{
10082	struct sctp_tmit_chunk *chk;
10083	struct sctp_forward_tsn_chunk *fwdtsn;
10084	uint32_t advance_peer_ack_point;
10085
10086	SCTP_TCB_LOCK_ASSERT(stcb);
10087	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10088		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10089			/* mark it to unsent */
10090			chk->sent = SCTP_DATAGRAM_UNSENT;
10091			chk->snd_count = 0;
10092			/* Do we correct its output location? */
10093			if (chk->whoTo) {
10094				sctp_free_remote_addr(chk->whoTo);
10095				chk->whoTo = NULL;
10096			}
10097			goto sctp_fill_in_rest;
10098		}
10099	}
10100	/* Ok if we reach here we must build one */
10101	sctp_alloc_a_chunk(stcb, chk);
10102	if (chk == NULL) {
10103		return;
10104	}
10105	asoc->fwd_tsn_cnt++;
10106	chk->copy_by_ref = 0;
10107	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10108	chk->rec.chunk_id.can_take_data = 0;
10109	chk->asoc = asoc;
10110	chk->whoTo = NULL;
10111	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10112	if (chk->data == NULL) {
10113		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10114		return;
10115	}
10116	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10117	chk->sent = SCTP_DATAGRAM_UNSENT;
10118	chk->snd_count = 0;
10119	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10120	asoc->ctrl_queue_cnt++;
10121sctp_fill_in_rest:
10122	/*-
10123	 * Here we go through and fill out the part that deals with
10124	 * stream/seq of the ones we skip.
10125	 */
10126	SCTP_BUF_LEN(chk->data) = 0;
10127	{
10128		struct sctp_tmit_chunk *at, *tp1, *last;
10129		struct sctp_strseq *strseq;
10130		unsigned int cnt_of_space, i, ovh;
10131		unsigned int space_needed;
10132		unsigned int cnt_of_skipped = 0;
10133
10134		TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10135			if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10136			    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10137				/* no more to look at */
10138				break;
10139			}
10140			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10141				/* We don't report these */
10142				continue;
10143			}
10144			cnt_of_skipped++;
10145		}
10146		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10147		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10148
10149		cnt_of_space = M_TRAILINGSPACE(chk->data);
10150
10151		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10152			ovh = SCTP_MIN_OVERHEAD;
10153		} else {
10154			ovh = SCTP_MIN_V4_OVERHEAD;
10155		}
10156		if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10157			/* trim to a mtu size */
10158			cnt_of_space = asoc->smallest_mtu - ovh;
10159		}
10160		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10161			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10162			    0xff, 0, cnt_of_skipped,
10163			    asoc->advanced_peer_ack_point);
10164
10165		}
10166		advance_peer_ack_point = asoc->advanced_peer_ack_point;
10167		if (cnt_of_space < space_needed) {
10168			/*-
10169			 * ok we must trim down the chunk by lowering the
10170			 * advance peer ack point.
10171			 */
10172			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10173				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10174				    0xff, 0xff, cnt_of_space,
10175				    space_needed);
10176			}
10177			cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10178			cnt_of_skipped /= sizeof(struct sctp_strseq);
10179			/*-
10180			 * Go through and find the TSN that will be the one
10181			 * we report.
10182			 */
10183			at = TAILQ_FIRST(&asoc->sent_queue);
10184			if (at != NULL) {
10185				for (i = 0; i < cnt_of_skipped; i++) {
10186					tp1 = TAILQ_NEXT(at, sctp_next);
10187					if (tp1 == NULL) {
10188						break;
10189					}
10190					at = tp1;
10191				}
10192			}
10193			if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10194				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10195				    0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10196				    asoc->advanced_peer_ack_point);
10197			}
10198			last = at;
10199			/*-
10200			 * last now points to last one I can report, update
10201			 * peer ack point
10202			 */
10203			if (last)
10204				advance_peer_ack_point = last->rec.data.TSN_seq;
10205			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10206			    cnt_of_skipped * sizeof(struct sctp_strseq);
10207		}
10208		chk->send_size = space_needed;
10209		/* Setup the chunk */
10210		fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10211		fwdtsn->ch.chunk_length = htons(chk->send_size);
10212		fwdtsn->ch.chunk_flags = 0;
10213		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10214		fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10215		SCTP_BUF_LEN(chk->data) = chk->send_size;
10216		fwdtsn++;
10217		/*-
10218		 * Move pointer to after the fwdtsn and transfer to the
10219		 * strseq pointer.
10220		 */
10221		strseq = (struct sctp_strseq *)fwdtsn;
10222		/*-
10223		 * Now populate the strseq list. This is done blindly
10224		 * without pulling out duplicate stream info. This is
10225		 * inefficent but won't harm the process since the peer will
10226		 * look at these in sequence and will thus release anything.
10227		 * It could mean we exceed the PMTU and chop off some that
10228		 * we could have included.. but this is unlikely (aka 1432/4
10229		 * would mean 300+ stream seq's would have to be reported in
10230		 * one FWD-TSN. With a bit of work we can later FIX this to
10231		 * optimize and pull out duplcates.. but it does add more
10232		 * overhead. So for now... not!
10233		 */
10234		at = TAILQ_FIRST(&asoc->sent_queue);
10235		for (i = 0; i < cnt_of_skipped; i++) {
10236			tp1 = TAILQ_NEXT(at, sctp_next);
10237			if (tp1 == NULL)
10238				break;
10239			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10240				/* We don't report these */
10241				i--;
10242				at = tp1;
10243				continue;
10244			}
10245			if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10246				at->rec.data.fwd_tsn_cnt = 0;
10247			}
10248			strseq->stream = ntohs(at->rec.data.stream_number);
10249			strseq->sequence = ntohs(at->rec.data.stream_seq);
10250			strseq++;
10251			at = tp1;
10252		}
10253	}
10254	return;
10255}
10256
10257void
10258sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10259#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10260    SCTP_UNUSED
10261#endif
10262)
10263{
10264	/*-
10265	 * Queue up a SACK or NR-SACK in the control queue.
10266	 * We must first check to see if a SACK or NR-SACK is
10267	 * somehow on the control queue.
10268	 * If so, we will take and and remove the old one.
10269	 */
10270	struct sctp_association *asoc;
10271	struct sctp_tmit_chunk *chk, *a_chk;
10272	struct sctp_sack_chunk *sack;
10273	struct sctp_nr_sack_chunk *nr_sack;
10274	struct sctp_gap_ack_block *gap_descriptor;
10275	struct sack_track *selector;
10276	int mergeable = 0;
10277	int offset;
10278	caddr_t limit;
10279	uint32_t *dup;
10280	int limit_reached = 0;
10281	unsigned int i, siz, j;
10282	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10283	int num_dups = 0;
10284	int space_req;
10285	uint32_t highest_tsn;
10286	uint8_t flags;
10287	uint8_t type;
10288	uint8_t tsn_map;
10289
10290	if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10291	    (stcb->asoc.peer_supports_nr_sack == 1)) {
10292		type = SCTP_NR_SELECTIVE_ACK;
10293	} else {
10294		type = SCTP_SELECTIVE_ACK;
10295	}
10296	a_chk = NULL;
10297	asoc = &stcb->asoc;
10298	SCTP_TCB_LOCK_ASSERT(stcb);
10299	if (asoc->last_data_chunk_from == NULL) {
10300		/* Hmm we never received anything */
10301		return;
10302	}
10303	sctp_slide_mapping_arrays(stcb);
10304	sctp_set_rwnd(stcb, asoc);
10305	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10306		if (chk->rec.chunk_id.id == type) {
10307			/* Hmm, found a sack already on queue, remove it */
10308			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10309			asoc->ctrl_queue_cnt--;
10310			a_chk = chk;
10311			if (a_chk->data) {
10312				sctp_m_freem(a_chk->data);
10313				a_chk->data = NULL;
10314			}
10315			if (a_chk->whoTo) {
10316				sctp_free_remote_addr(a_chk->whoTo);
10317				a_chk->whoTo = NULL;
10318			}
10319			break;
10320		}
10321	}
10322	if (a_chk == NULL) {
10323		sctp_alloc_a_chunk(stcb, a_chk);
10324		if (a_chk == NULL) {
10325			/* No memory so we drop the idea, and set a timer */
10326			if (stcb->asoc.delayed_ack) {
10327				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10328				    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10329				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10330				    stcb->sctp_ep, stcb, NULL);
10331			} else {
10332				stcb->asoc.send_sack = 1;
10333			}
10334			return;
10335		}
10336		a_chk->copy_by_ref = 0;
10337		a_chk->rec.chunk_id.id = type;
10338		a_chk->rec.chunk_id.can_take_data = 1;
10339	}
10340	/* Clear our pkt counts */
10341	asoc->data_pkts_seen = 0;
10342
10343	a_chk->asoc = asoc;
10344	a_chk->snd_count = 0;
10345	a_chk->send_size = 0;	/* fill in later */
10346	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10347	a_chk->whoTo = NULL;
10348
10349	if ((asoc->numduptsns) ||
10350	    (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10351		/*-
10352		 * Ok, we have some duplicates or the destination for the
10353		 * sack is unreachable, lets see if we can select an
10354		 * alternate than asoc->last_data_chunk_from
10355		 */
10356		if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10357		    (asoc->used_alt_onsack > asoc->numnets)) {
10358			/* We used an alt last time, don't this time */
10359			a_chk->whoTo = NULL;
10360		} else {
10361			asoc->used_alt_onsack++;
10362			a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10363		}
10364		if (a_chk->whoTo == NULL) {
10365			/* Nope, no alternate */
10366			a_chk->whoTo = asoc->last_data_chunk_from;
10367			asoc->used_alt_onsack = 0;
10368		}
10369	} else {
10370		/*
10371		 * No duplicates so we use the last place we received data
10372		 * from.
10373		 */
10374		asoc->used_alt_onsack = 0;
10375		a_chk->whoTo = asoc->last_data_chunk_from;
10376	}
10377	if (a_chk->whoTo) {
10378		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10379	}
10380	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10381		highest_tsn = asoc->highest_tsn_inside_map;
10382	} else {
10383		highest_tsn = asoc->highest_tsn_inside_nr_map;
10384	}
10385	if (highest_tsn == asoc->cumulative_tsn) {
10386		/* no gaps */
10387		if (type == SCTP_SELECTIVE_ACK) {
10388			space_req = sizeof(struct sctp_sack_chunk);
10389		} else {
10390			space_req = sizeof(struct sctp_nr_sack_chunk);
10391		}
10392	} else {
10393		/* gaps get a cluster */
10394		space_req = MCLBYTES;
10395	}
10396	/* Ok now lets formulate a MBUF with our sack */
10397	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10398	if ((a_chk->data == NULL) ||
10399	    (a_chk->whoTo == NULL)) {
10400		/* rats, no mbuf memory */
10401		if (a_chk->data) {
10402			/* was a problem with the destination */
10403			sctp_m_freem(a_chk->data);
10404			a_chk->data = NULL;
10405		}
10406		sctp_free_a_chunk(stcb, a_chk, so_locked);
10407		/* sa_ignore NO_NULL_CHK */
10408		if (stcb->asoc.delayed_ack) {
10409			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10410			    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10411			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10412			    stcb->sctp_ep, stcb, NULL);
10413		} else {
10414			stcb->asoc.send_sack = 1;
10415		}
10416		return;
10417	}
10418	/* ok, lets go through and fill it in */
10419	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10420	space = M_TRAILINGSPACE(a_chk->data);
10421	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10422		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10423	}
10424	limit = mtod(a_chk->data, caddr_t);
10425	limit += space;
10426
10427	flags = 0;
10428
10429	if ((asoc->sctp_cmt_on_off > 0) &&
10430	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10431		/*-
10432		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10433		 * received, then set high bit to 1, else 0. Reset
10434		 * pkts_rcvd.
10435		 */
10436		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10437		asoc->cmt_dac_pkts_rcvd = 0;
10438	}
10439#ifdef SCTP_ASOCLOG_OF_TSNS
10440	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10441	stcb->asoc.cumack_log_atsnt++;
10442	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10443		stcb->asoc.cumack_log_atsnt = 0;
10444	}
10445#endif
10446	/* reset the readers interpretation */
10447	stcb->freed_by_sorcv_sincelast = 0;
10448
10449	if (type == SCTP_SELECTIVE_ACK) {
10450		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10451		nr_sack = NULL;
10452		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10453		if (highest_tsn > asoc->mapping_array_base_tsn) {
10454			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10455		} else {
10456			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10457		}
10458	} else {
10459		sack = NULL;
10460		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10461		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10462		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10463			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10464		} else {
10465			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10466		}
10467	}
10468
10469	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10470		offset = 1;
10471	} else {
10472		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10473	}
10474	if (((type == SCTP_SELECTIVE_ACK) &&
10475	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10476	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10477	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10478		/* we have a gap .. maybe */
10479		for (i = 0; i < siz; i++) {
10480			tsn_map = asoc->mapping_array[i];
10481			if (type == SCTP_SELECTIVE_ACK) {
10482				tsn_map |= asoc->nr_mapping_array[i];
10483			}
10484			if (i == 0) {
10485				/*
10486				 * Clear all bits corresponding to TSNs
10487				 * smaller or equal to the cumulative TSN.
10488				 */
10489				tsn_map &= (~0 << (1 - offset));
10490			}
10491			selector = &sack_array[tsn_map];
10492			if (mergeable && selector->right_edge) {
10493				/*
10494				 * Backup, left and right edges were ok to
10495				 * merge.
10496				 */
10497				num_gap_blocks--;
10498				gap_descriptor--;
10499			}
10500			if (selector->num_entries == 0)
10501				mergeable = 0;
10502			else {
10503				for (j = 0; j < selector->num_entries; j++) {
10504					if (mergeable && selector->right_edge) {
10505						/*
10506						 * do a merge by NOT setting
10507						 * the left side
10508						 */
10509						mergeable = 0;
10510					} else {
10511						/*
10512						 * no merge, set the left
10513						 * side
10514						 */
10515						mergeable = 0;
10516						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10517					}
10518					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10519					num_gap_blocks++;
10520					gap_descriptor++;
10521					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10522						/* no more room */
10523						limit_reached = 1;
10524						break;
10525					}
10526				}
10527				if (selector->left_edge) {
10528					mergeable = 1;
10529				}
10530			}
10531			if (limit_reached) {
10532				/* Reached the limit stop */
10533				break;
10534			}
10535			offset += 8;
10536		}
10537	}
10538	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10539	    (limit_reached == 0)) {
10540
10541		mergeable = 0;
10542
10543		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10544			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10545		} else {
10546			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10547		}
10548
10549		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10550			offset = 1;
10551		} else {
10552			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10553		}
10554		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10555			/* we have a gap .. maybe */
10556			for (i = 0; i < siz; i++) {
10557				tsn_map = asoc->nr_mapping_array[i];
10558				if (i == 0) {
10559					/*
10560					 * Clear all bits corresponding to
10561					 * TSNs smaller or equal to the
10562					 * cumulative TSN.
10563					 */
10564					tsn_map &= (~0 << (1 - offset));
10565				}
10566				selector = &sack_array[tsn_map];
10567				if (mergeable && selector->right_edge) {
10568					/*
10569					 * Backup, left and right edges were
10570					 * ok to merge.
10571					 */
10572					num_nr_gap_blocks--;
10573					gap_descriptor--;
10574				}
10575				if (selector->num_entries == 0)
10576					mergeable = 0;
10577				else {
10578					for (j = 0; j < selector->num_entries; j++) {
10579						if (mergeable && selector->right_edge) {
10580							/*
10581							 * do a merge by NOT
10582							 * setting the left
10583							 * side
10584							 */
10585							mergeable = 0;
10586						} else {
10587							/*
10588							 * no merge, set the
10589							 * left side
10590							 */
10591							mergeable = 0;
10592							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10593						}
10594						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10595						num_nr_gap_blocks++;
10596						gap_descriptor++;
10597						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10598							/* no more room */
10599							limit_reached = 1;
10600							break;
10601						}
10602					}
10603					if (selector->left_edge) {
10604						mergeable = 1;
10605					}
10606				}
10607				if (limit_reached) {
10608					/* Reached the limit stop */
10609					break;
10610				}
10611				offset += 8;
10612			}
10613		}
10614	}
10615	/* now we must add any dups we are going to report. */
10616	if ((limit_reached == 0) && (asoc->numduptsns)) {
10617		dup = (uint32_t *) gap_descriptor;
10618		for (i = 0; i < asoc->numduptsns; i++) {
10619			*dup = htonl(asoc->dup_tsns[i]);
10620			dup++;
10621			num_dups++;
10622			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10623				/* no more room */
10624				break;
10625			}
10626		}
10627		asoc->numduptsns = 0;
10628	}
10629	/*
10630	 * now that the chunk is prepared queue it to the control chunk
10631	 * queue.
10632	 */
10633	if (type == SCTP_SELECTIVE_ACK) {
10634		a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10635		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10636		    num_dups * sizeof(int32_t);
10637		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10638		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10639		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10640		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10641		sack->sack.num_dup_tsns = htons(num_dups);
10642		sack->ch.chunk_type = type;
10643		sack->ch.chunk_flags = flags;
10644		sack->ch.chunk_length = htons(a_chk->send_size);
10645	} else {
10646		a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10647		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10648		    num_dups * sizeof(int32_t);
10649		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10650		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10651		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10652		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10653		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10654		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10655		nr_sack->nr_sack.reserved = 0;
10656		nr_sack->ch.chunk_type = type;
10657		nr_sack->ch.chunk_flags = flags;
10658		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10659	}
10660	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10661	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10662	asoc->ctrl_queue_cnt++;
10663	asoc->send_sack = 0;
10664	SCTP_STAT_INCR(sctps_sendsacks);
10665	return;
10666}
10667
10668void
10669sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10670#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10671    SCTP_UNUSED
10672#endif
10673)
10674{
10675	struct mbuf *m_abort, *m, *m_last;
10676	struct mbuf *m_out, *m_end = NULL;
10677	struct sctp_abort_chunk *abort;
10678	struct sctp_auth_chunk *auth = NULL;
10679	struct sctp_nets *net;
10680	uint32_t vtag;
10681	uint32_t auth_offset = 0;
10682	uint16_t cause_len, chunk_len, padding_len;
10683
10684	SCTP_TCB_LOCK_ASSERT(stcb);
10685	/*-
10686	 * Add an AUTH chunk, if chunk requires it and save the offset into
10687	 * the chain for AUTH
10688	 */
10689	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10690	    stcb->asoc.peer_auth_chunks)) {
10691		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10692		    stcb, SCTP_ABORT_ASSOCIATION);
10693		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10694	} else {
10695		m_out = NULL;
10696	}
10697	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10698	if (m_abort == NULL) {
10699		if (m_out) {
10700			sctp_m_freem(m_out);
10701		}
10702		if (operr) {
10703			sctp_m_freem(operr);
10704		}
10705		return;
10706	}
10707	/* link in any error */
10708	SCTP_BUF_NEXT(m_abort) = operr;
10709	cause_len = 0;
10710	m_last = NULL;
10711	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10712		cause_len += (uint16_t) SCTP_BUF_LEN(m);
10713		if (SCTP_BUF_NEXT(m) == NULL) {
10714			m_last = m;
10715		}
10716	}
10717	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10718	chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10719	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10720	if (m_out == NULL) {
10721		/* NO Auth chunk prepended, so reserve space in front */
10722		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10723		m_out = m_abort;
10724	} else {
10725		/* Put AUTH chunk at the front of the chain */
10726		SCTP_BUF_NEXT(m_end) = m_abort;
10727	}
10728	if (stcb->asoc.alternate) {
10729		net = stcb->asoc.alternate;
10730	} else {
10731		net = stcb->asoc.primary_destination;
10732	}
10733	/* Fill in the ABORT chunk header. */
10734	abort = mtod(m_abort, struct sctp_abort_chunk *);
10735	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10736	if (stcb->asoc.peer_vtag == 0) {
10737		/* This happens iff the assoc is in COOKIE-WAIT state. */
10738		vtag = stcb->asoc.my_vtag;
10739		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10740	} else {
10741		vtag = stcb->asoc.peer_vtag;
10742		abort->ch.chunk_flags = 0;
10743	}
10744	abort->ch.chunk_length = htons(chunk_len);
10745	/* Add padding, if necessary. */
10746	if (padding_len > 0) {
10747		if ((m_last == NULL) || sctp_add_pad_tombuf(m_last, padding_len)) {
10748			sctp_m_freem(m_out);
10749			return;
10750		}
10751	}
10752	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10753	    (struct sockaddr *)&net->ro._l_addr,
10754	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10755	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10756	    stcb->asoc.primary_destination->port, NULL,
10757	    0, 0,
10758	    so_locked);
10759	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10760}
10761
10762void
10763sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10764    struct sctp_nets *net,
10765    int reflect_vtag)
10766{
10767	/* formulate and SEND a SHUTDOWN-COMPLETE */
10768	struct mbuf *m_shutdown_comp;
10769	struct sctp_shutdown_complete_chunk *shutdown_complete;
10770	uint32_t vtag;
10771	uint8_t flags;
10772
10773	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10774	if (m_shutdown_comp == NULL) {
10775		/* no mbuf's */
10776		return;
10777	}
10778	if (reflect_vtag) {
10779		flags = SCTP_HAD_NO_TCB;
10780		vtag = stcb->asoc.my_vtag;
10781	} else {
10782		flags = 0;
10783		vtag = stcb->asoc.peer_vtag;
10784	}
10785	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10786	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10787	shutdown_complete->ch.chunk_flags = flags;
10788	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10789	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10790	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10791	    (struct sockaddr *)&net->ro._l_addr,
10792	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10793	    stcb->sctp_ep->sctp_lport, stcb->rport,
10794	    htonl(vtag),
10795	    net->port, NULL,
10796	    0, 0,
10797	    SCTP_SO_NOT_LOCKED);
10798	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10799	return;
10800}
10801
10802static void
10803sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10804    struct sctphdr *sh, uint32_t vtag,
10805    uint8_t type, struct mbuf *cause,
10806    uint8_t use_mflowid, uint32_t mflowid,
10807    uint32_t vrf_id, uint16_t port)
10808{
10809	struct mbuf *o_pak;
10810	struct mbuf *mout;
10811	struct sctphdr *shout;
10812	struct sctp_chunkhdr *ch;
10813	struct udphdr *udp;
10814	int len, cause_len, padding_len;
10815
10816#if defined(INET) || defined(INET6)
10817	int ret;
10818
10819#endif
10820#ifdef INET
10821	struct sockaddr_in *src_sin, *dst_sin;
10822	struct ip *ip;
10823
10824#endif
10825#ifdef INET6
10826	struct sockaddr_in6 *src_sin6, *dst_sin6;
10827	struct ip6_hdr *ip6;
10828
10829#endif
10830
10831	/* Compute the length of the cause and add final padding. */
10832	cause_len = 0;
10833	if (cause != NULL) {
10834		struct mbuf *m_at, *m_last = NULL;
10835
10836		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10837			if (SCTP_BUF_NEXT(m_at) == NULL)
10838				m_last = m_at;
10839			cause_len += SCTP_BUF_LEN(m_at);
10840		}
10841		padding_len = cause_len % 4;
10842		if (padding_len != 0) {
10843			padding_len = 4 - padding_len;
10844		}
10845		if (padding_len != 0) {
10846			if (sctp_add_pad_tombuf(m_last, padding_len)) {
10847				sctp_m_freem(cause);
10848				return;
10849			}
10850		}
10851	} else {
10852		padding_len = 0;
10853	}
10854	/* Get an mbuf for the header. */
10855	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10856	switch (dst->sa_family) {
10857#ifdef INET
10858	case AF_INET:
10859		len += sizeof(struct ip);
10860		break;
10861#endif
10862#ifdef INET6
10863	case AF_INET6:
10864		len += sizeof(struct ip6_hdr);
10865		break;
10866#endif
10867	default:
10868		break;
10869	}
10870	if (port) {
10871		len += sizeof(struct udphdr);
10872	}
10873	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
10874	if (mout == NULL) {
10875		if (cause) {
10876			sctp_m_freem(cause);
10877		}
10878		return;
10879	}
10880	SCTP_BUF_RESV_UF(mout, max_linkhdr);
10881	SCTP_BUF_LEN(mout) = len;
10882	SCTP_BUF_NEXT(mout) = cause;
10883	if (use_mflowid != 0) {
10884		mout->m_pkthdr.flowid = mflowid;
10885		mout->m_flags |= M_FLOWID;
10886	}
10887#ifdef INET
10888	ip = NULL;
10889#endif
10890#ifdef INET6
10891	ip6 = NULL;
10892#endif
10893	switch (dst->sa_family) {
10894#ifdef INET
10895	case AF_INET:
10896		src_sin = (struct sockaddr_in *)src;
10897		dst_sin = (struct sockaddr_in *)dst;
10898		ip = mtod(mout, struct ip *);
10899		ip->ip_v = IPVERSION;
10900		ip->ip_hl = (sizeof(struct ip) >> 2);
10901		ip->ip_tos = 0;
10902		ip->ip_id = ip_newid();
10903		ip->ip_off = 0;
10904		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10905		if (port) {
10906			ip->ip_p = IPPROTO_UDP;
10907		} else {
10908			ip->ip_p = IPPROTO_SCTP;
10909		}
10910		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10911		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10912		ip->ip_sum = 0;
10913		len = sizeof(struct ip);
10914		shout = (struct sctphdr *)((caddr_t)ip + len);
10915		break;
10916#endif
10917#ifdef INET6
10918	case AF_INET6:
10919		src_sin6 = (struct sockaddr_in6 *)src;
10920		dst_sin6 = (struct sockaddr_in6 *)dst;
10921		ip6 = mtod(mout, struct ip6_hdr *);
10922		ip6->ip6_flow = htonl(0x60000000);
10923		if (V_ip6_auto_flowlabel) {
10924			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10925		}
10926		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10927		if (port) {
10928			ip6->ip6_nxt = IPPROTO_UDP;
10929		} else {
10930			ip6->ip6_nxt = IPPROTO_SCTP;
10931		}
10932		ip6->ip6_src = dst_sin6->sin6_addr;
10933		ip6->ip6_dst = src_sin6->sin6_addr;
10934		len = sizeof(struct ip6_hdr);
10935		shout = (struct sctphdr *)((caddr_t)ip6 + len);
10936		break;
10937#endif
10938	default:
10939		len = 0;
10940		shout = mtod(mout, struct sctphdr *);
10941		break;
10942	}
10943	if (port) {
10944		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10945			sctp_m_freem(mout);
10946			return;
10947		}
10948		udp = (struct udphdr *)shout;
10949		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10950		udp->uh_dport = port;
10951		udp->uh_sum = 0;
10952		udp->uh_ulen = htons(sizeof(struct udphdr) +
10953		    sizeof(struct sctphdr) +
10954		    sizeof(struct sctp_chunkhdr) +
10955		    cause_len + padding_len);
10956		len += sizeof(struct udphdr);
10957		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10958	} else {
10959		udp = NULL;
10960	}
10961	shout->src_port = sh->dest_port;
10962	shout->dest_port = sh->src_port;
10963	shout->checksum = 0;
10964	if (vtag) {
10965		shout->v_tag = htonl(vtag);
10966	} else {
10967		shout->v_tag = sh->v_tag;
10968	}
10969	len += sizeof(struct sctphdr);
10970	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10971	ch->chunk_type = type;
10972	if (vtag) {
10973		ch->chunk_flags = 0;
10974	} else {
10975		ch->chunk_flags = SCTP_HAD_NO_TCB;
10976	}
10977	ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10978	len += sizeof(struct sctp_chunkhdr);
10979	len += cause_len + padding_len;
10980
10981	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10982		sctp_m_freem(mout);
10983		return;
10984	}
10985	SCTP_ATTACH_CHAIN(o_pak, mout, len);
10986	switch (dst->sa_family) {
10987#ifdef INET
10988	case AF_INET:
10989		if (port) {
10990			if (V_udp_cksum) {
10991				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10992			} else {
10993				udp->uh_sum = 0;
10994			}
10995		}
10996		ip->ip_len = htons(len);
10997		if (port) {
10998#if defined(SCTP_WITH_NO_CSUM)
10999			SCTP_STAT_INCR(sctps_sendnocrc);
11000#else
11001			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11002			SCTP_STAT_INCR(sctps_sendswcrc);
11003#endif
11004			if (V_udp_cksum) {
11005				SCTP_ENABLE_UDP_CSUM(o_pak);
11006			}
11007		} else {
11008#if defined(SCTP_WITH_NO_CSUM)
11009			SCTP_STAT_INCR(sctps_sendnocrc);
11010#else
11011			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11012			mout->m_pkthdr.csum_data = 0;
11013			SCTP_STAT_INCR(sctps_sendhwcrc);
11014#endif
11015		}
11016#ifdef SCTP_PACKET_LOGGING
11017		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11018			sctp_packet_log(o_pak);
11019		}
11020#endif
11021		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11022		break;
11023#endif
11024#ifdef INET6
11025	case AF_INET6:
11026		ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11027		if (port) {
11028#if defined(SCTP_WITH_NO_CSUM)
11029			SCTP_STAT_INCR(sctps_sendnocrc);
11030#else
11031			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11032			SCTP_STAT_INCR(sctps_sendswcrc);
11033#endif
11034			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11035				udp->uh_sum = 0xffff;
11036			}
11037		} else {
11038#if defined(SCTP_WITH_NO_CSUM)
11039			SCTP_STAT_INCR(sctps_sendnocrc);
11040#else
11041			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11042			mout->m_pkthdr.csum_data = 0;
11043			SCTP_STAT_INCR(sctps_sendhwcrc);
11044#endif
11045		}
11046#ifdef SCTP_PACKET_LOGGING
11047		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11048			sctp_packet_log(o_pak);
11049		}
11050#endif
11051		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11052		break;
11053#endif
11054	default:
11055		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11056		    dst->sa_family);
11057		sctp_m_freem(mout);
11058		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11059		return;
11060	}
11061	SCTP_STAT_INCR(sctps_sendpackets);
11062	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11063	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11064	return;
11065}
11066
11067void
11068sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11069    struct sctphdr *sh,
11070    uint8_t use_mflowid, uint32_t mflowid,
11071    uint32_t vrf_id, uint16_t port)
11072{
11073	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11074	    use_mflowid, mflowid,
11075	    vrf_id, port);
11076}
11077
11078void
11079sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11080#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11081    SCTP_UNUSED
11082#endif
11083)
11084{
11085	struct sctp_tmit_chunk *chk;
11086	struct sctp_heartbeat_chunk *hb;
11087	struct timeval now;
11088
11089	SCTP_TCB_LOCK_ASSERT(stcb);
11090	if (net == NULL) {
11091		return;
11092	}
11093	(void)SCTP_GETTIME_TIMEVAL(&now);
11094	switch (net->ro._l_addr.sa.sa_family) {
11095#ifdef INET
11096	case AF_INET:
11097		break;
11098#endif
11099#ifdef INET6
11100	case AF_INET6:
11101		break;
11102#endif
11103	default:
11104		return;
11105	}
11106	sctp_alloc_a_chunk(stcb, chk);
11107	if (chk == NULL) {
11108		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11109		return;
11110	}
11111	chk->copy_by_ref = 0;
11112	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11113	chk->rec.chunk_id.can_take_data = 1;
11114	chk->asoc = &stcb->asoc;
11115	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11116
11117	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11118	if (chk->data == NULL) {
11119		sctp_free_a_chunk(stcb, chk, so_locked);
11120		return;
11121	}
11122	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11123	SCTP_BUF_LEN(chk->data) = chk->send_size;
11124	chk->sent = SCTP_DATAGRAM_UNSENT;
11125	chk->snd_count = 0;
11126	chk->whoTo = net;
11127	atomic_add_int(&chk->whoTo->ref_count, 1);
11128	/* Now we have a mbuf that we can fill in with the details */
11129	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11130	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11131	/* fill out chunk header */
11132	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11133	hb->ch.chunk_flags = 0;
11134	hb->ch.chunk_length = htons(chk->send_size);
11135	/* Fill out hb parameter */
11136	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11137	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11138	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11139	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11140	/* Did our user request this one, put it in */
11141	hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11142	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11143	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11144		/*
11145		 * we only take from the entropy pool if the address is not
11146		 * confirmed.
11147		 */
11148		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11149		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11150	} else {
11151		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11152		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11153	}
11154	switch (net->ro._l_addr.sa.sa_family) {
11155#ifdef INET
11156	case AF_INET:
11157		memcpy(hb->heartbeat.hb_info.address,
11158		    &net->ro._l_addr.sin.sin_addr,
11159		    sizeof(net->ro._l_addr.sin.sin_addr));
11160		break;
11161#endif
11162#ifdef INET6
11163	case AF_INET6:
11164		memcpy(hb->heartbeat.hb_info.address,
11165		    &net->ro._l_addr.sin6.sin6_addr,
11166		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11167		break;
11168#endif
11169	default:
11170		return;
11171		break;
11172	}
11173	net->hb_responded = 0;
11174	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11175	stcb->asoc.ctrl_queue_cnt++;
11176	SCTP_STAT_INCR(sctps_sendheartbeat);
11177	return;
11178}
11179
11180void
11181sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11182    uint32_t high_tsn)
11183{
11184	struct sctp_association *asoc;
11185	struct sctp_ecne_chunk *ecne;
11186	struct sctp_tmit_chunk *chk;
11187
11188	if (net == NULL) {
11189		return;
11190	}
11191	asoc = &stcb->asoc;
11192	SCTP_TCB_LOCK_ASSERT(stcb);
11193	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11194		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11195			/* found a previous ECN_ECHO update it if needed */
11196			uint32_t cnt, ctsn;
11197
11198			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11199			ctsn = ntohl(ecne->tsn);
11200			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11201				ecne->tsn = htonl(high_tsn);
11202				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11203			}
11204			cnt = ntohl(ecne->num_pkts_since_cwr);
11205			cnt++;
11206			ecne->num_pkts_since_cwr = htonl(cnt);
11207			return;
11208		}
11209	}
11210	/* nope could not find one to update so we must build one */
11211	sctp_alloc_a_chunk(stcb, chk);
11212	if (chk == NULL) {
11213		return;
11214	}
11215	chk->copy_by_ref = 0;
11216	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11217	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11218	chk->rec.chunk_id.can_take_data = 0;
11219	chk->asoc = &stcb->asoc;
11220	chk->send_size = sizeof(struct sctp_ecne_chunk);
11221	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11222	if (chk->data == NULL) {
11223		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11224		return;
11225	}
11226	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11227	SCTP_BUF_LEN(chk->data) = chk->send_size;
11228	chk->sent = SCTP_DATAGRAM_UNSENT;
11229	chk->snd_count = 0;
11230	chk->whoTo = net;
11231	atomic_add_int(&chk->whoTo->ref_count, 1);
11232
11233	stcb->asoc.ecn_echo_cnt_onq++;
11234	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11235	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11236	ecne->ch.chunk_flags = 0;
11237	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11238	ecne->tsn = htonl(high_tsn);
11239	ecne->num_pkts_since_cwr = htonl(1);
11240	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11241	asoc->ctrl_queue_cnt++;
11242}
11243
11244void
11245sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11246    struct mbuf *m, int len, int iphlen, int bad_crc)
11247{
11248	struct sctp_association *asoc;
11249	struct sctp_pktdrop_chunk *drp;
11250	struct sctp_tmit_chunk *chk;
11251	uint8_t *datap;
11252	int was_trunc = 0;
11253	int fullsz = 0;
11254	long spc;
11255	int offset;
11256	struct sctp_chunkhdr *ch, chunk_buf;
11257	unsigned int chk_length;
11258
11259	if (!stcb) {
11260		return;
11261	}
11262	asoc = &stcb->asoc;
11263	SCTP_TCB_LOCK_ASSERT(stcb);
11264	if (asoc->peer_supports_pktdrop == 0) {
11265		/*-
11266		 * peer must declare support before I send one.
11267		 */
11268		return;
11269	}
11270	if (stcb->sctp_socket == NULL) {
11271		return;
11272	}
11273	sctp_alloc_a_chunk(stcb, chk);
11274	if (chk == NULL) {
11275		return;
11276	}
11277	chk->copy_by_ref = 0;
11278	len -= iphlen;
11279	chk->send_size = len;
11280	/* Validate that we do not have an ABORT in here. */
11281	offset = iphlen + sizeof(struct sctphdr);
11282	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11283	    sizeof(*ch), (uint8_t *) & chunk_buf);
11284	while (ch != NULL) {
11285		chk_length = ntohs(ch->chunk_length);
11286		if (chk_length < sizeof(*ch)) {
11287			/* break to abort land */
11288			break;
11289		}
11290		switch (ch->chunk_type) {
11291		case SCTP_PACKET_DROPPED:
11292		case SCTP_ABORT_ASSOCIATION:
11293		case SCTP_INITIATION_ACK:
11294			/**
11295			 * We don't respond with an PKT-DROP to an ABORT
11296			 * or PKT-DROP. We also do not respond to an
11297			 * INIT-ACK, because we can't know if the initiation
11298			 * tag is correct or not.
11299			 */
11300			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11301			return;
11302		default:
11303			break;
11304		}
11305		offset += SCTP_SIZE32(chk_length);
11306		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11307		    sizeof(*ch), (uint8_t *) & chunk_buf);
11308	}
11309
11310	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11311	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11312		/*
11313		 * only send 1 mtu worth, trim off the excess on the end.
11314		 */
11315		fullsz = len;
11316		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11317		was_trunc = 1;
11318	}
11319	chk->asoc = &stcb->asoc;
11320	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11321	if (chk->data == NULL) {
11322jump_out:
11323		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11324		return;
11325	}
11326	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11327	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11328	if (drp == NULL) {
11329		sctp_m_freem(chk->data);
11330		chk->data = NULL;
11331		goto jump_out;
11332	}
11333	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11334	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11335	chk->book_size_scale = 0;
11336	if (was_trunc) {
11337		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11338		drp->trunc_len = htons(fullsz);
11339		/*
11340		 * Len is already adjusted to size minus overhead above take
11341		 * out the pkt_drop chunk itself from it.
11342		 */
11343		chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11344		len = chk->send_size;
11345	} else {
11346		/* no truncation needed */
11347		drp->ch.chunk_flags = 0;
11348		drp->trunc_len = htons(0);
11349	}
11350	if (bad_crc) {
11351		drp->ch.chunk_flags |= SCTP_BADCRC;
11352	}
11353	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11354	SCTP_BUF_LEN(chk->data) = chk->send_size;
11355	chk->sent = SCTP_DATAGRAM_UNSENT;
11356	chk->snd_count = 0;
11357	if (net) {
11358		/* we should hit here */
11359		chk->whoTo = net;
11360		atomic_add_int(&chk->whoTo->ref_count, 1);
11361	} else {
11362		chk->whoTo = NULL;
11363	}
11364	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11365	chk->rec.chunk_id.can_take_data = 1;
11366	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11367	drp->ch.chunk_length = htons(chk->send_size);
11368	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11369	if (spc < 0) {
11370		spc = 0;
11371	}
11372	drp->bottle_bw = htonl(spc);
11373	if (asoc->my_rwnd) {
11374		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11375		    asoc->size_on_all_streams +
11376		    asoc->my_rwnd_control_len +
11377		    stcb->sctp_socket->so_rcv.sb_cc);
11378	} else {
11379		/*-
11380		 * If my rwnd is 0, possibly from mbuf depletion as well as
11381		 * space used, tell the peer there is NO space aka onq == bw
11382		 */
11383		drp->current_onq = htonl(spc);
11384	}
11385	drp->reserved = 0;
11386	datap = drp->data;
11387	m_copydata(m, iphlen, len, (caddr_t)datap);
11388	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11389	asoc->ctrl_queue_cnt++;
11390}
11391
11392void
11393sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11394{
11395	struct sctp_association *asoc;
11396	struct sctp_cwr_chunk *cwr;
11397	struct sctp_tmit_chunk *chk;
11398
11399	SCTP_TCB_LOCK_ASSERT(stcb);
11400	if (net == NULL) {
11401		return;
11402	}
11403	asoc = &stcb->asoc;
11404	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11405		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11406			/*
11407			 * found a previous CWR queued to same destination
11408			 * update it if needed
11409			 */
11410			uint32_t ctsn;
11411
11412			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11413			ctsn = ntohl(cwr->tsn);
11414			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11415				cwr->tsn = htonl(high_tsn);
11416			}
11417			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11418				/* Make sure override is carried */
11419				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11420			}
11421			return;
11422		}
11423	}
11424	sctp_alloc_a_chunk(stcb, chk);
11425	if (chk == NULL) {
11426		return;
11427	}
11428	chk->copy_by_ref = 0;
11429	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11430	chk->rec.chunk_id.can_take_data = 1;
11431	chk->asoc = &stcb->asoc;
11432	chk->send_size = sizeof(struct sctp_cwr_chunk);
11433	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11434	if (chk->data == NULL) {
11435		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11436		return;
11437	}
11438	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11439	SCTP_BUF_LEN(chk->data) = chk->send_size;
11440	chk->sent = SCTP_DATAGRAM_UNSENT;
11441	chk->snd_count = 0;
11442	chk->whoTo = net;
11443	atomic_add_int(&chk->whoTo->ref_count, 1);
11444	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11445	cwr->ch.chunk_type = SCTP_ECN_CWR;
11446	cwr->ch.chunk_flags = override;
11447	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11448	cwr->tsn = htonl(high_tsn);
11449	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11450	asoc->ctrl_queue_cnt++;
11451}
11452
11453void
11454sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11455    int number_entries, uint16_t * list,
11456    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11457{
11458	uint16_t len, old_len, i;
11459	struct sctp_stream_reset_out_request *req_out;
11460	struct sctp_chunkhdr *ch;
11461
11462	ch = mtod(chk->data, struct sctp_chunkhdr *);
11463	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11464
11465	/* get to new offset for the param. */
11466	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11467	/* now how long will this param be? */
11468	len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11469	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11470	req_out->ph.param_length = htons(len);
11471	req_out->request_seq = htonl(seq);
11472	req_out->response_seq = htonl(resp_seq);
11473	req_out->send_reset_at_tsn = htonl(last_sent);
11474	if (number_entries) {
11475		for (i = 0; i < number_entries; i++) {
11476			req_out->list_of_streams[i] = htons(list[i]);
11477		}
11478	}
11479	if (SCTP_SIZE32(len) > len) {
11480		/*-
11481		 * Need to worry about the pad we may end up adding to the
11482		 * end. This is easy since the struct is either aligned to 4
11483		 * bytes or 2 bytes off.
11484		 */
11485		req_out->list_of_streams[number_entries] = 0;
11486	}
11487	/* now fix the chunk length */
11488	ch->chunk_length = htons(len + old_len);
11489	chk->book_size = len + old_len;
11490	chk->book_size_scale = 0;
11491	chk->send_size = SCTP_SIZE32(chk->book_size);
11492	SCTP_BUF_LEN(chk->data) = chk->send_size;
11493	return;
11494}
11495
11496static void
11497sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11498    int number_entries, uint16_t * list,
11499    uint32_t seq)
11500{
11501	uint16_t len, old_len, i;
11502	struct sctp_stream_reset_in_request *req_in;
11503	struct sctp_chunkhdr *ch;
11504
11505	ch = mtod(chk->data, struct sctp_chunkhdr *);
11506	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11507
11508	/* get to new offset for the param. */
11509	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11510	/* now how long will this param be? */
11511	len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11512	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11513	req_in->ph.param_length = htons(len);
11514	req_in->request_seq = htonl(seq);
11515	if (number_entries) {
11516		for (i = 0; i < number_entries; i++) {
11517			req_in->list_of_streams[i] = htons(list[i]);
11518		}
11519	}
11520	if (SCTP_SIZE32(len) > len) {
11521		/*-
11522		 * Need to worry about the pad we may end up adding to the
11523		 * end. This is easy since the struct is either aligned to 4
11524		 * bytes or 2 bytes off.
11525		 */
11526		req_in->list_of_streams[number_entries] = 0;
11527	}
11528	/* now fix the chunk length */
11529	ch->chunk_length = htons(len + old_len);
11530	chk->book_size = len + old_len;
11531	chk->book_size_scale = 0;
11532	chk->send_size = SCTP_SIZE32(chk->book_size);
11533	SCTP_BUF_LEN(chk->data) = chk->send_size;
11534	return;
11535}
11536
11537static void
11538sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11539    uint32_t seq)
11540{
11541	uint16_t len, old_len;
11542	struct sctp_stream_reset_tsn_request *req_tsn;
11543	struct sctp_chunkhdr *ch;
11544
11545	ch = mtod(chk->data, struct sctp_chunkhdr *);
11546	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11547
11548	/* get to new offset for the param. */
11549	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11550	/* now how long will this param be? */
11551	len = sizeof(struct sctp_stream_reset_tsn_request);
11552	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11553	req_tsn->ph.param_length = htons(len);
11554	req_tsn->request_seq = htonl(seq);
11555
11556	/* now fix the chunk length */
11557	ch->chunk_length = htons(len + old_len);
11558	chk->send_size = len + old_len;
11559	chk->book_size = SCTP_SIZE32(chk->send_size);
11560	chk->book_size_scale = 0;
11561	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11562	return;
11563}
11564
11565void
11566sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11567    uint32_t resp_seq, uint32_t result)
11568{
11569	uint16_t len, old_len;
11570	struct sctp_stream_reset_response *resp;
11571	struct sctp_chunkhdr *ch;
11572
11573	ch = mtod(chk->data, struct sctp_chunkhdr *);
11574	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11575
11576	/* get to new offset for the param. */
11577	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11578	/* now how long will this param be? */
11579	len = sizeof(struct sctp_stream_reset_response);
11580	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11581	resp->ph.param_length = htons(len);
11582	resp->response_seq = htonl(resp_seq);
11583	resp->result = ntohl(result);
11584
11585	/* now fix the chunk length */
11586	ch->chunk_length = htons(len + old_len);
11587	chk->book_size = len + old_len;
11588	chk->book_size_scale = 0;
11589	chk->send_size = SCTP_SIZE32(chk->book_size);
11590	SCTP_BUF_LEN(chk->data) = chk->send_size;
11591	return;
11592}
11593
11594void
11595sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11596    uint32_t resp_seq, uint32_t result,
11597    uint32_t send_una, uint32_t recv_next)
11598{
11599	uint16_t len, old_len;
11600	struct sctp_stream_reset_response_tsn *resp;
11601	struct sctp_chunkhdr *ch;
11602
11603	ch = mtod(chk->data, struct sctp_chunkhdr *);
11604	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11605
11606	/* get to new offset for the param. */
11607	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11608	/* now how long will this param be? */
11609	len = sizeof(struct sctp_stream_reset_response_tsn);
11610	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11611	resp->ph.param_length = htons(len);
11612	resp->response_seq = htonl(resp_seq);
11613	resp->result = htonl(result);
11614	resp->senders_next_tsn = htonl(send_una);
11615	resp->receivers_next_tsn = htonl(recv_next);
11616
11617	/* now fix the chunk length */
11618	ch->chunk_length = htons(len + old_len);
11619	chk->book_size = len + old_len;
11620	chk->send_size = SCTP_SIZE32(chk->book_size);
11621	chk->book_size_scale = 0;
11622	SCTP_BUF_LEN(chk->data) = chk->send_size;
11623	return;
11624}
11625
11626static void
11627sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11628    uint32_t seq,
11629    uint16_t adding)
11630{
11631	uint16_t len, old_len;
11632	struct sctp_chunkhdr *ch;
11633	struct sctp_stream_reset_add_strm *addstr;
11634
11635	ch = mtod(chk->data, struct sctp_chunkhdr *);
11636	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11637
11638	/* get to new offset for the param. */
11639	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11640	/* now how long will this param be? */
11641	len = sizeof(struct sctp_stream_reset_add_strm);
11642
11643	/* Fill it out. */
11644	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11645	addstr->ph.param_length = htons(len);
11646	addstr->request_seq = htonl(seq);
11647	addstr->number_of_streams = htons(adding);
11648	addstr->reserved = 0;
11649
11650	/* now fix the chunk length */
11651	ch->chunk_length = htons(len + old_len);
11652	chk->send_size = len + old_len;
11653	chk->book_size = SCTP_SIZE32(chk->send_size);
11654	chk->book_size_scale = 0;
11655	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11656	return;
11657}
11658
11659static void
11660sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11661    uint32_t seq,
11662    uint16_t adding)
11663{
11664	uint16_t len, old_len;
11665	struct sctp_chunkhdr *ch;
11666	struct sctp_stream_reset_add_strm *addstr;
11667
11668	ch = mtod(chk->data, struct sctp_chunkhdr *);
11669	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11670
11671	/* get to new offset for the param. */
11672	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11673	/* now how long will this param be? */
11674	len = sizeof(struct sctp_stream_reset_add_strm);
11675	/* Fill it out. */
11676	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11677	addstr->ph.param_length = htons(len);
11678	addstr->request_seq = htonl(seq);
11679	addstr->number_of_streams = htons(adding);
11680	addstr->reserved = 0;
11681
11682	/* now fix the chunk length */
11683	ch->chunk_length = htons(len + old_len);
11684	chk->send_size = len + old_len;
11685	chk->book_size = SCTP_SIZE32(chk->send_size);
11686	chk->book_size_scale = 0;
11687	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11688	return;
11689}
11690
11691int
11692sctp_send_str_reset_req(struct sctp_tcb *stcb,
11693    int number_entries, uint16_t * list,
11694    uint8_t send_out_req,
11695    uint8_t send_in_req,
11696    uint8_t send_tsn_req,
11697    uint8_t add_stream,
11698    uint16_t adding_o,
11699    uint16_t adding_i, uint8_t peer_asked)
11700{
11701
11702	struct sctp_association *asoc;
11703	struct sctp_tmit_chunk *chk;
11704	struct sctp_chunkhdr *ch;
11705	uint32_t seq;
11706
11707	asoc = &stcb->asoc;
11708	if (asoc->stream_reset_outstanding) {
11709		/*-
11710		 * Already one pending, must get ACK back to clear the flag.
11711		 */
11712		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11713		return (EBUSY);
11714	}
11715	if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11716	    (add_stream == 0)) {
11717		/* nothing to do */
11718		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11719		return (EINVAL);
11720	}
11721	if (send_tsn_req && (send_out_req || send_in_req)) {
11722		/* error, can't do that */
11723		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11724		return (EINVAL);
11725	}
11726	sctp_alloc_a_chunk(stcb, chk);
11727	if (chk == NULL) {
11728		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11729		return (ENOMEM);
11730	}
11731	chk->copy_by_ref = 0;
11732	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11733	chk->rec.chunk_id.can_take_data = 0;
11734	chk->asoc = &stcb->asoc;
11735	chk->book_size = sizeof(struct sctp_chunkhdr);
11736	chk->send_size = SCTP_SIZE32(chk->book_size);
11737	chk->book_size_scale = 0;
11738
11739	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11740	if (chk->data == NULL) {
11741		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11742		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11743		return (ENOMEM);
11744	}
11745	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11746
11747	/* setup chunk parameters */
11748	chk->sent = SCTP_DATAGRAM_UNSENT;
11749	chk->snd_count = 0;
11750	if (stcb->asoc.alternate) {
11751		chk->whoTo = stcb->asoc.alternate;
11752	} else {
11753		chk->whoTo = stcb->asoc.primary_destination;
11754	}
11755	atomic_add_int(&chk->whoTo->ref_count, 1);
11756	ch = mtod(chk->data, struct sctp_chunkhdr *);
11757	ch->chunk_type = SCTP_STREAM_RESET;
11758	ch->chunk_flags = 0;
11759	ch->chunk_length = htons(chk->book_size);
11760	SCTP_BUF_LEN(chk->data) = chk->send_size;
11761
11762	seq = stcb->asoc.str_reset_seq_out;
11763	if (send_out_req) {
11764		sctp_add_stream_reset_out(chk, number_entries, list,
11765		    seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11766		asoc->stream_reset_out_is_outstanding = 1;
11767		seq++;
11768		asoc->stream_reset_outstanding++;
11769	}
11770	if ((add_stream & 1) &&
11771	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11772		/* Need to allocate more */
11773		struct sctp_stream_out *oldstream;
11774		struct sctp_stream_queue_pending *sp, *nsp;
11775		int i;
11776
11777		oldstream = stcb->asoc.strmout;
11778		/* get some more */
11779		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11780		    ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11781		    SCTP_M_STRMO);
11782		if (stcb->asoc.strmout == NULL) {
11783			uint8_t x;
11784
11785			stcb->asoc.strmout = oldstream;
11786			/* Turn off the bit */
11787			x = add_stream & 0xfe;
11788			add_stream = x;
11789			goto skip_stuff;
11790		}
11791		/*
11792		 * Ok now we proceed with copying the old out stuff and
11793		 * initializing the new stuff.
11794		 */
11795		SCTP_TCB_SEND_LOCK(stcb);
11796		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11797		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11798			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11799			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11800			stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11801			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11802			stcb->asoc.strmout[i].stream_no = i;
11803			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11804			/* now anything on those queues? */
11805			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11806				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11807				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11808			}
11809			/* Now move assoc pointers too */
11810			if (stcb->asoc.last_out_stream == &oldstream[i]) {
11811				stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11812			}
11813			if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11814				stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11815			}
11816		}
11817		/* now the new streams */
11818		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11819		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11820			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11821			stcb->asoc.strmout[i].chunks_on_queues = 0;
11822			stcb->asoc.strmout[i].next_sequence_send = 0x0;
11823			stcb->asoc.strmout[i].stream_no = i;
11824			stcb->asoc.strmout[i].last_msg_incomplete = 0;
11825			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11826		}
11827		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11828		SCTP_FREE(oldstream, SCTP_M_STRMO);
11829		SCTP_TCB_SEND_UNLOCK(stcb);
11830	}
11831skip_stuff:
11832	if ((add_stream & 1) && (adding_o > 0)) {
11833		asoc->strm_pending_add_size = adding_o;
11834		asoc->peer_req_out = peer_asked;
11835		sctp_add_an_out_stream(chk, seq, adding_o);
11836		seq++;
11837		asoc->stream_reset_outstanding++;
11838	}
11839	if ((add_stream & 2) && (adding_i > 0)) {
11840		sctp_add_an_in_stream(chk, seq, adding_i);
11841		seq++;
11842		asoc->stream_reset_outstanding++;
11843	}
11844	if (send_in_req) {
11845		sctp_add_stream_reset_in(chk, number_entries, list, seq);
11846		seq++;
11847		asoc->stream_reset_outstanding++;
11848	}
11849	if (send_tsn_req) {
11850		sctp_add_stream_reset_tsn(chk, seq);
11851		asoc->stream_reset_outstanding++;
11852	}
11853	asoc->str_reset = chk;
11854	/* insert the chunk for sending */
11855	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11856	    chk,
11857	    sctp_next);
11858	asoc->ctrl_queue_cnt++;
11859	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11860	return (0);
11861}
11862
11863void
11864sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11865    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11866    uint8_t use_mflowid, uint32_t mflowid,
11867    uint32_t vrf_id, uint16_t port)
11868{
11869	/* Don't respond to an ABORT with an ABORT. */
11870	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11871		if (cause)
11872			sctp_m_freem(cause);
11873		return;
11874	}
11875	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11876	    use_mflowid, mflowid,
11877	    vrf_id, port);
11878	return;
11879}
11880
11881void
11882sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11883    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11884    uint8_t use_mflowid, uint32_t mflowid,
11885    uint32_t vrf_id, uint16_t port)
11886{
11887	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11888	    use_mflowid, mflowid,
11889	    vrf_id, port);
11890	return;
11891}
11892
11893static struct mbuf *
11894sctp_copy_resume(struct uio *uio,
11895    int max_send_len,
11896    int user_marks_eor,
11897    int *error,
11898    uint32_t * sndout,
11899    struct mbuf **new_tail)
11900{
11901	struct mbuf *m;
11902
11903	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11904	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11905	if (m == NULL) {
11906		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11907		*error = ENOMEM;
11908	} else {
11909		*sndout = m_length(m, NULL);
11910		*new_tail = m_last(m);
11911	}
11912	return (m);
11913}
11914
11915static int
11916sctp_copy_one(struct sctp_stream_queue_pending *sp,
11917    struct uio *uio,
11918    int resv_upfront)
11919{
11920	int left;
11921
11922	left = sp->length;
11923	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11924	    resv_upfront, 0);
11925	if (sp->data == NULL) {
11926		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11927		return (ENOMEM);
11928	}
11929	sp->tail_mbuf = m_last(sp->data);
11930	return (0);
11931}
11932
11933
11934
11935static struct sctp_stream_queue_pending *
11936sctp_copy_it_in(struct sctp_tcb *stcb,
11937    struct sctp_association *asoc,
11938    struct sctp_sndrcvinfo *srcv,
11939    struct uio *uio,
11940    struct sctp_nets *net,
11941    int max_send_len,
11942    int user_marks_eor,
11943    int *error)
11944{
11945	/*-
11946	 * This routine must be very careful in its work. Protocol
11947	 * processing is up and running so care must be taken to spl...()
11948	 * when you need to do something that may effect the stcb/asoc. The
11949	 * sb is locked however. When data is copied the protocol processing
11950	 * should be enabled since this is a slower operation...
11951	 */
11952	struct sctp_stream_queue_pending *sp = NULL;
11953	int resv_in_first;
11954
11955	*error = 0;
11956	/* Now can we send this? */
11957	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11958	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11959	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11960	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11961		/* got data while shutting down */
11962		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11963		*error = ECONNRESET;
11964		goto out_now;
11965	}
11966	sctp_alloc_a_strmoq(stcb, sp);
11967	if (sp == NULL) {
11968		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11969		*error = ENOMEM;
11970		goto out_now;
11971	}
11972	sp->act_flags = 0;
11973	sp->sender_all_done = 0;
11974	sp->sinfo_flags = srcv->sinfo_flags;
11975	sp->timetolive = srcv->sinfo_timetolive;
11976	sp->ppid = srcv->sinfo_ppid;
11977	sp->context = srcv->sinfo_context;
11978	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11979
11980	sp->stream = srcv->sinfo_stream;
11981	sp->length = min(uio->uio_resid, max_send_len);
11982	if ((sp->length == (uint32_t) uio->uio_resid) &&
11983	    ((user_marks_eor == 0) ||
11984	    (srcv->sinfo_flags & SCTP_EOF) ||
11985	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11986		sp->msg_is_complete = 1;
11987	} else {
11988		sp->msg_is_complete = 0;
11989	}
11990	sp->sender_all_done = 0;
11991	sp->some_taken = 0;
11992	sp->put_last_out = 0;
11993	resv_in_first = sizeof(struct sctp_data_chunk);
11994	sp->data = sp->tail_mbuf = NULL;
11995	if (sp->length == 0) {
11996		*error = 0;
11997		goto skip_copy;
11998	}
11999	if (srcv->sinfo_keynumber_valid) {
12000		sp->auth_keyid = srcv->sinfo_keynumber;
12001	} else {
12002		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12003	}
12004	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12005		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12006		sp->holds_key_ref = 1;
12007	}
12008	*error = sctp_copy_one(sp, uio, resv_in_first);
12009skip_copy:
12010	if (*error) {
12011		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12012		sp = NULL;
12013	} else {
12014		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12015			sp->net = net;
12016			atomic_add_int(&sp->net->ref_count, 1);
12017		} else {
12018			sp->net = NULL;
12019		}
12020		sctp_set_prsctp_policy(sp);
12021	}
12022out_now:
12023	return (sp);
12024}
12025
12026
12027int
12028sctp_sosend(struct socket *so,
12029    struct sockaddr *addr,
12030    struct uio *uio,
12031    struct mbuf *top,
12032    struct mbuf *control,
12033    int flags,
12034    struct thread *p
12035)
12036{
12037	int error, use_sndinfo = 0;
12038	struct sctp_sndrcvinfo sndrcvninfo;
12039	struct sockaddr *addr_to_use;
12040
12041#if defined(INET) && defined(INET6)
12042	struct sockaddr_in sin;
12043
12044#endif
12045
12046	if (control) {
12047		/* process cmsg snd/rcv info (maybe a assoc-id) */
12048		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12049		    sizeof(sndrcvninfo))) {
12050			/* got one */
12051			use_sndinfo = 1;
12052		}
12053	}
12054	addr_to_use = addr;
12055#if defined(INET) && defined(INET6)
12056	if ((addr) && (addr->sa_family == AF_INET6)) {
12057		struct sockaddr_in6 *sin6;
12058
12059		sin6 = (struct sockaddr_in6 *)addr;
12060		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12061			in6_sin6_2_sin(&sin, sin6);
12062			addr_to_use = (struct sockaddr *)&sin;
12063		}
12064	}
12065#endif
12066	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12067	    control,
12068	    flags,
12069	    use_sndinfo ? &sndrcvninfo : NULL
12070	    ,p
12071	    );
12072	return (error);
12073}
12074
12075
12076int
12077sctp_lower_sosend(struct socket *so,
12078    struct sockaddr *addr,
12079    struct uio *uio,
12080    struct mbuf *i_pak,
12081    struct mbuf *control,
12082    int flags,
12083    struct sctp_sndrcvinfo *srcv
12084    ,
12085    struct thread *p
12086)
12087{
12088	unsigned int sndlen = 0, max_len;
12089	int error, len;
12090	struct mbuf *top = NULL;
12091	int queue_only = 0, queue_only_for_init = 0;
12092	int free_cnt_applied = 0;
12093	int un_sent;
12094	int now_filled = 0;
12095	unsigned int inqueue_bytes = 0;
12096	struct sctp_block_entry be;
12097	struct sctp_inpcb *inp;
12098	struct sctp_tcb *stcb = NULL;
12099	struct timeval now;
12100	struct sctp_nets *net;
12101	struct sctp_association *asoc;
12102	struct sctp_inpcb *t_inp;
12103	int user_marks_eor;
12104	int create_lock_applied = 0;
12105	int nagle_applies = 0;
12106	int some_on_control = 0;
12107	int got_all_of_the_send = 0;
12108	int hold_tcblock = 0;
12109	int non_blocking = 0;
12110	uint32_t local_add_more, local_soresv = 0;
12111	uint16_t port;
12112	uint16_t sinfo_flags;
12113	sctp_assoc_t sinfo_assoc_id;
12114
12115	error = 0;
12116	net = NULL;
12117	stcb = NULL;
12118	asoc = NULL;
12119
12120	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12121	if (inp == NULL) {
12122		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12123		error = EINVAL;
12124		if (i_pak) {
12125			SCTP_RELEASE_PKT(i_pak);
12126		}
12127		return (error);
12128	}
12129	if ((uio == NULL) && (i_pak == NULL)) {
12130		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12131		return (EINVAL);
12132	}
12133	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12134	atomic_add_int(&inp->total_sends, 1);
12135	if (uio) {
12136		if (uio->uio_resid < 0) {
12137			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12138			return (EINVAL);
12139		}
12140		sndlen = uio->uio_resid;
12141	} else {
12142		top = SCTP_HEADER_TO_CHAIN(i_pak);
12143		sndlen = SCTP_HEADER_LEN(i_pak);
12144	}
12145	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12146	    (void *)addr,
12147	    sndlen);
12148	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12149	    (inp->sctp_socket->so_qlimit)) {
12150		/* The listener can NOT send */
12151		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12152		error = ENOTCONN;
12153		goto out_unlocked;
12154	}
12155	/**
12156	 * Pre-screen address, if one is given the sin-len
12157	 * must be set correctly!
12158	 */
12159	if (addr) {
12160		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12161
12162		switch (raddr->sa.sa_family) {
12163#ifdef INET
12164		case AF_INET:
12165			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12166				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12167				error = EINVAL;
12168				goto out_unlocked;
12169			}
12170			port = raddr->sin.sin_port;
12171			break;
12172#endif
12173#ifdef INET6
12174		case AF_INET6:
12175			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12176				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12177				error = EINVAL;
12178				goto out_unlocked;
12179			}
12180			port = raddr->sin6.sin6_port;
12181			break;
12182#endif
12183		default:
12184			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12185			error = EAFNOSUPPORT;
12186			goto out_unlocked;
12187		}
12188	} else
12189		port = 0;
12190
12191	if (srcv) {
12192		sinfo_flags = srcv->sinfo_flags;
12193		sinfo_assoc_id = srcv->sinfo_assoc_id;
12194		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12195		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12196			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12197			error = EINVAL;
12198			goto out_unlocked;
12199		}
12200		if (srcv->sinfo_flags)
12201			SCTP_STAT_INCR(sctps_sends_with_flags);
12202	} else {
12203		sinfo_flags = inp->def_send.sinfo_flags;
12204		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12205	}
12206	if (sinfo_flags & SCTP_SENDALL) {
12207		/* its a sendall */
12208		error = sctp_sendall(inp, uio, top, srcv);
12209		top = NULL;
12210		goto out_unlocked;
12211	}
12212	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12213		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12214		error = EINVAL;
12215		goto out_unlocked;
12216	}
12217	/* now we must find the assoc */
12218	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12219	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12220		SCTP_INP_RLOCK(inp);
12221		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12222		if (stcb) {
12223			SCTP_TCB_LOCK(stcb);
12224			hold_tcblock = 1;
12225		}
12226		SCTP_INP_RUNLOCK(inp);
12227	} else if (sinfo_assoc_id) {
12228		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12229	} else if (addr) {
12230		/*-
12231		 * Since we did not use findep we must
12232		 * increment it, and if we don't find a tcb
12233		 * decrement it.
12234		 */
12235		SCTP_INP_WLOCK(inp);
12236		SCTP_INP_INCR_REF(inp);
12237		SCTP_INP_WUNLOCK(inp);
12238		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12239		if (stcb == NULL) {
12240			SCTP_INP_WLOCK(inp);
12241			SCTP_INP_DECR_REF(inp);
12242			SCTP_INP_WUNLOCK(inp);
12243		} else {
12244			hold_tcblock = 1;
12245		}
12246	}
12247	if ((stcb == NULL) && (addr)) {
12248		/* Possible implicit send? */
12249		SCTP_ASOC_CREATE_LOCK(inp);
12250		create_lock_applied = 1;
12251		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12252		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12253			/* Should I really unlock ? */
12254			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12255			error = EINVAL;
12256			goto out_unlocked;
12257
12258		}
12259		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12260		    (addr->sa_family == AF_INET6)) {
12261			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12262			error = EINVAL;
12263			goto out_unlocked;
12264		}
12265		SCTP_INP_WLOCK(inp);
12266		SCTP_INP_INCR_REF(inp);
12267		SCTP_INP_WUNLOCK(inp);
12268		/* With the lock applied look again */
12269		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12270		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12271			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12272		}
12273		if (stcb == NULL) {
12274			SCTP_INP_WLOCK(inp);
12275			SCTP_INP_DECR_REF(inp);
12276			SCTP_INP_WUNLOCK(inp);
12277		} else {
12278			hold_tcblock = 1;
12279		}
12280		if (error) {
12281			goto out_unlocked;
12282		}
12283		if (t_inp != inp) {
12284			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12285			error = ENOTCONN;
12286			goto out_unlocked;
12287		}
12288	}
12289	if (stcb == NULL) {
12290		if (addr == NULL) {
12291			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12292			error = ENOENT;
12293			goto out_unlocked;
12294		} else {
12295			/* We must go ahead and start the INIT process */
12296			uint32_t vrf_id;
12297
12298			if ((sinfo_flags & SCTP_ABORT) ||
12299			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12300				/*-
12301				 * User asks to abort a non-existant assoc,
12302				 * or EOF a non-existant assoc with no data
12303				 */
12304				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12305				error = ENOENT;
12306				goto out_unlocked;
12307			}
12308			/* get an asoc/stcb struct */
12309			vrf_id = inp->def_vrf_id;
12310#ifdef INVARIANTS
12311			if (create_lock_applied == 0) {
12312				panic("Error, should hold create lock and I don't?");
12313			}
12314#endif
12315			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12316			    p
12317			    );
12318			if (stcb == NULL) {
12319				/* Error is setup for us in the call */
12320				goto out_unlocked;
12321			}
12322			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12323				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12324				/*
12325				 * Set the connected flag so we can queue
12326				 * data
12327				 */
12328				soisconnecting(so);
12329			}
12330			hold_tcblock = 1;
12331			if (create_lock_applied) {
12332				SCTP_ASOC_CREATE_UNLOCK(inp);
12333				create_lock_applied = 0;
12334			} else {
12335				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12336			}
12337			/*
12338			 * Turn on queue only flag to prevent data from
12339			 * being sent
12340			 */
12341			queue_only = 1;
12342			asoc = &stcb->asoc;
12343			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12344			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12345
12346			/* initialize authentication params for the assoc */
12347			sctp_initialize_auth_params(inp, stcb);
12348
12349			if (control) {
12350				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12351					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12352					hold_tcblock = 0;
12353					stcb = NULL;
12354					goto out_unlocked;
12355				}
12356			}
12357			/* out with the INIT */
12358			queue_only_for_init = 1;
12359			/*-
12360			 * we may want to dig in after this call and adjust the MTU
12361			 * value. It defaulted to 1500 (constant) but the ro
12362			 * structure may now have an update and thus we may need to
12363			 * change it BEFORE we append the message.
12364			 */
12365		}
12366	} else
12367		asoc = &stcb->asoc;
12368	if (srcv == NULL)
12369		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12370	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12371		if (addr)
12372			net = sctp_findnet(stcb, addr);
12373		else
12374			net = NULL;
12375		if ((net == NULL) ||
12376		    ((port != 0) && (port != stcb->rport))) {
12377			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12378			error = EINVAL;
12379			goto out_unlocked;
12380		}
12381	} else {
12382		if (stcb->asoc.alternate) {
12383			net = stcb->asoc.alternate;
12384		} else {
12385			net = stcb->asoc.primary_destination;
12386		}
12387	}
12388	atomic_add_int(&stcb->total_sends, 1);
12389	/* Keep the stcb from being freed under our feet */
12390	atomic_add_int(&asoc->refcnt, 1);
12391	free_cnt_applied = 1;
12392
12393	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12394		if (sndlen > asoc->smallest_mtu) {
12395			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12396			error = EMSGSIZE;
12397			goto out_unlocked;
12398		}
12399	}
12400	if (SCTP_SO_IS_NBIO(so)
12401	    || (flags & MSG_NBIO)
12402	    ) {
12403		non_blocking = 1;
12404	}
12405	/* would we block? */
12406	if (non_blocking) {
12407		if (hold_tcblock == 0) {
12408			SCTP_TCB_LOCK(stcb);
12409			hold_tcblock = 1;
12410		}
12411		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12412		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12413		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12414			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12415			if (sndlen > SCTP_SB_LIMIT_SND(so))
12416				error = EMSGSIZE;
12417			else
12418				error = EWOULDBLOCK;
12419			goto out_unlocked;
12420		}
12421		stcb->asoc.sb_send_resv += sndlen;
12422		SCTP_TCB_UNLOCK(stcb);
12423		hold_tcblock = 0;
12424	} else {
12425		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12426	}
12427	local_soresv = sndlen;
12428	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12429		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12430		error = ECONNRESET;
12431		goto out_unlocked;
12432	}
12433	if (create_lock_applied) {
12434		SCTP_ASOC_CREATE_UNLOCK(inp);
12435		create_lock_applied = 0;
12436	}
12437	if (asoc->stream_reset_outstanding) {
12438		/*
12439		 * Can't queue any data while stream reset is underway.
12440		 */
12441		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12442		error = EAGAIN;
12443		goto out_unlocked;
12444	}
12445	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12446	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12447		queue_only = 1;
12448	}
12449	/* we are now done with all control */
12450	if (control) {
12451		sctp_m_freem(control);
12452		control = NULL;
12453	}
12454	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12455	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12456	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12457	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12458		if (srcv->sinfo_flags & SCTP_ABORT) {
12459			;
12460		} else {
12461			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12462			error = ECONNRESET;
12463			goto out_unlocked;
12464		}
12465	}
12466	/* Ok, we will attempt a msgsnd :> */
12467	if (p) {
12468		p->td_ru.ru_msgsnd++;
12469	}
12470	/* Are we aborting? */
12471	if (srcv->sinfo_flags & SCTP_ABORT) {
12472		struct mbuf *mm;
12473		int tot_demand, tot_out = 0, max_out;
12474
12475		SCTP_STAT_INCR(sctps_sends_with_abort);
12476		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12477		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12478			/* It has to be up before we abort */
12479			/* how big is the user initiated abort? */
12480			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12481			error = EINVAL;
12482			goto out;
12483		}
12484		if (hold_tcblock) {
12485			SCTP_TCB_UNLOCK(stcb);
12486			hold_tcblock = 0;
12487		}
12488		if (top) {
12489			struct mbuf *cntm = NULL;
12490
12491			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12492			if (sndlen != 0) {
12493				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12494					tot_out += SCTP_BUF_LEN(cntm);
12495				}
12496			}
12497		} else {
12498			/* Must fit in a MTU */
12499			tot_out = sndlen;
12500			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12501			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12502				/* To big */
12503				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12504				error = EMSGSIZE;
12505				goto out;
12506			}
12507			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12508		}
12509		if (mm == NULL) {
12510			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12511			error = ENOMEM;
12512			goto out;
12513		}
12514		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12515		max_out -= sizeof(struct sctp_abort_msg);
12516		if (tot_out > max_out) {
12517			tot_out = max_out;
12518		}
12519		if (mm) {
12520			struct sctp_paramhdr *ph;
12521
12522			/* now move forward the data pointer */
12523			ph = mtod(mm, struct sctp_paramhdr *);
12524			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12525			ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12526			ph++;
12527			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12528			if (top == NULL) {
12529				error = uiomove((caddr_t)ph, (int)tot_out, uio);
12530				if (error) {
12531					/*-
12532					 * Here if we can't get his data we
12533					 * still abort we just don't get to
12534					 * send the users note :-0
12535					 */
12536					sctp_m_freem(mm);
12537					mm = NULL;
12538				}
12539			} else {
12540				if (sndlen != 0) {
12541					SCTP_BUF_NEXT(mm) = top;
12542				}
12543			}
12544		}
12545		if (hold_tcblock == 0) {
12546			SCTP_TCB_LOCK(stcb);
12547		}
12548		atomic_add_int(&stcb->asoc.refcnt, -1);
12549		free_cnt_applied = 0;
12550		/* release this lock, otherwise we hang on ourselves */
12551		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12552		/* now relock the stcb so everything is sane */
12553		hold_tcblock = 0;
12554		stcb = NULL;
12555		/*
12556		 * In this case top is already chained to mm avoid double
12557		 * free, since we free it below if top != NULL and driver
12558		 * would free it after sending the packet out
12559		 */
12560		if (sndlen != 0) {
12561			top = NULL;
12562		}
12563		goto out_unlocked;
12564	}
12565	/* Calculate the maximum we can send */
12566	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12567	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12568		if (non_blocking) {
12569			/* we already checked for non-blocking above. */
12570			max_len = sndlen;
12571		} else {
12572			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12573		}
12574	} else {
12575		max_len = 0;
12576	}
12577	if (hold_tcblock) {
12578		SCTP_TCB_UNLOCK(stcb);
12579		hold_tcblock = 0;
12580	}
12581	/* Is the stream no. valid? */
12582	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12583		/* Invalid stream number */
12584		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12585		error = EINVAL;
12586		goto out_unlocked;
12587	}
12588	if (asoc->strmout == NULL) {
12589		/* huh? software error */
12590		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12591		error = EFAULT;
12592		goto out_unlocked;
12593	}
12594	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
12595	if ((user_marks_eor == 0) &&
12596	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12597		/* It will NEVER fit */
12598		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12599		error = EMSGSIZE;
12600		goto out_unlocked;
12601	}
12602	if ((uio == NULL) && user_marks_eor) {
12603		/*-
12604		 * We do not support eeor mode for
12605		 * sending with mbuf chains (like sendfile).
12606		 */
12607		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12608		error = EINVAL;
12609		goto out_unlocked;
12610	}
12611	if (user_marks_eor) {
12612		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12613	} else {
12614		/*-
12615		 * For non-eeor the whole message must fit in
12616		 * the socket send buffer.
12617		 */
12618		local_add_more = sndlen;
12619	}
12620	len = 0;
12621	if (non_blocking) {
12622		goto skip_preblock;
12623	}
12624	if (((max_len <= local_add_more) &&
12625	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12626	    (max_len == 0) ||
12627	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12628		/* No room right now ! */
12629		SOCKBUF_LOCK(&so->so_snd);
12630		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12631		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12632		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12633			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12634			    (unsigned int)SCTP_SB_LIMIT_SND(so),
12635			    inqueue_bytes,
12636			    local_add_more,
12637			    stcb->asoc.stream_queue_cnt,
12638			    stcb->asoc.chunks_on_out_queue,
12639			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12640			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12641				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12642			}
12643			be.error = 0;
12644			stcb->block_entry = &be;
12645			error = sbwait(&so->so_snd);
12646			stcb->block_entry = NULL;
12647			if (error || so->so_error || be.error) {
12648				if (error == 0) {
12649					if (so->so_error)
12650						error = so->so_error;
12651					if (be.error) {
12652						error = be.error;
12653					}
12654				}
12655				SOCKBUF_UNLOCK(&so->so_snd);
12656				goto out_unlocked;
12657			}
12658			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12659				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12660				    asoc, stcb->asoc.total_output_queue_size);
12661			}
12662			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12663				goto out_unlocked;
12664			}
12665			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12666		}
12667		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12668			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12669		} else {
12670			max_len = 0;
12671		}
12672		SOCKBUF_UNLOCK(&so->so_snd);
12673	}
12674skip_preblock:
12675	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12676		goto out_unlocked;
12677	}
12678	/*
12679	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12680	 * case NOTE: uio will be null when top/mbuf is passed
12681	 */
12682	if (sndlen == 0) {
12683		if (srcv->sinfo_flags & SCTP_EOF) {
12684			got_all_of_the_send = 1;
12685			goto dataless_eof;
12686		} else {
12687			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12688			error = EINVAL;
12689			goto out;
12690		}
12691	}
12692	if (top == NULL) {
12693		struct sctp_stream_queue_pending *sp;
12694		struct sctp_stream_out *strm;
12695		uint32_t sndout;
12696
12697		SCTP_TCB_SEND_LOCK(stcb);
12698		if ((asoc->stream_locked) &&
12699		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
12700			SCTP_TCB_SEND_UNLOCK(stcb);
12701			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12702			error = EINVAL;
12703			goto out;
12704		}
12705		SCTP_TCB_SEND_UNLOCK(stcb);
12706
12707		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12708		if (strm->last_msg_incomplete == 0) {
12709	do_a_copy_in:
12710			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12711			if ((sp == NULL) || (error)) {
12712				goto out;
12713			}
12714			SCTP_TCB_SEND_LOCK(stcb);
12715			if (sp->msg_is_complete) {
12716				strm->last_msg_incomplete = 0;
12717				asoc->stream_locked = 0;
12718			} else {
12719				/*
12720				 * Just got locked to this guy in case of an
12721				 * interrupt.
12722				 */
12723				strm->last_msg_incomplete = 1;
12724				asoc->stream_locked = 1;
12725				asoc->stream_locked_on = srcv->sinfo_stream;
12726				sp->sender_all_done = 0;
12727			}
12728			sctp_snd_sb_alloc(stcb, sp->length);
12729			atomic_add_int(&asoc->stream_queue_cnt, 1);
12730			if (srcv->sinfo_flags & SCTP_UNORDERED) {
12731				SCTP_STAT_INCR(sctps_sends_with_unord);
12732			}
12733			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12734			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12735			SCTP_TCB_SEND_UNLOCK(stcb);
12736		} else {
12737			SCTP_TCB_SEND_LOCK(stcb);
12738			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12739			SCTP_TCB_SEND_UNLOCK(stcb);
12740			if (sp == NULL) {
12741				/* ???? Huh ??? last msg is gone */
12742#ifdef INVARIANTS
12743				panic("Warning: Last msg marked incomplete, yet nothing left?");
12744#else
12745				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12746				strm->last_msg_incomplete = 0;
12747#endif
12748				goto do_a_copy_in;
12749
12750			}
12751		}
12752		while (uio->uio_resid > 0) {
12753			/* How much room do we have? */
12754			struct mbuf *new_tail, *mm;
12755
12756			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12757				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12758			else
12759				max_len = 0;
12760
12761			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12762			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12763			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12764				sndout = 0;
12765				new_tail = NULL;
12766				if (hold_tcblock) {
12767					SCTP_TCB_UNLOCK(stcb);
12768					hold_tcblock = 0;
12769				}
12770				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12771				if ((mm == NULL) || error) {
12772					if (mm) {
12773						sctp_m_freem(mm);
12774					}
12775					goto out;
12776				}
12777				/* Update the mbuf and count */
12778				SCTP_TCB_SEND_LOCK(stcb);
12779				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12780					/*
12781					 * we need to get out. Peer probably
12782					 * aborted.
12783					 */
12784					sctp_m_freem(mm);
12785					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12786						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12787						error = ECONNRESET;
12788					}
12789					SCTP_TCB_SEND_UNLOCK(stcb);
12790					goto out;
12791				}
12792				if (sp->tail_mbuf) {
12793					/* tack it to the end */
12794					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12795					sp->tail_mbuf = new_tail;
12796				} else {
12797					/* A stolen mbuf */
12798					sp->data = mm;
12799					sp->tail_mbuf = new_tail;
12800				}
12801				sctp_snd_sb_alloc(stcb, sndout);
12802				atomic_add_int(&sp->length, sndout);
12803				len += sndout;
12804
12805				/* Did we reach EOR? */
12806				if ((uio->uio_resid == 0) &&
12807				    ((user_marks_eor == 0) ||
12808				    (srcv->sinfo_flags & SCTP_EOF) ||
12809				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12810					sp->msg_is_complete = 1;
12811				} else {
12812					sp->msg_is_complete = 0;
12813				}
12814				SCTP_TCB_SEND_UNLOCK(stcb);
12815			}
12816			if (uio->uio_resid == 0) {
12817				/* got it all? */
12818				continue;
12819			}
12820			/* PR-SCTP? */
12821			if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12822				/*
12823				 * This is ugly but we must assure locking
12824				 * order
12825				 */
12826				if (hold_tcblock == 0) {
12827					SCTP_TCB_LOCK(stcb);
12828					hold_tcblock = 1;
12829				}
12830				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12831				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12832				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12833					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12834				else
12835					max_len = 0;
12836				if (max_len > 0) {
12837					continue;
12838				}
12839				SCTP_TCB_UNLOCK(stcb);
12840				hold_tcblock = 0;
12841			}
12842			/* wait for space now */
12843			if (non_blocking) {
12844				/* Non-blocking io in place out */
12845				goto skip_out_eof;
12846			}
12847			/* What about the INIT, send it maybe */
12848			if (queue_only_for_init) {
12849				if (hold_tcblock == 0) {
12850					SCTP_TCB_LOCK(stcb);
12851					hold_tcblock = 1;
12852				}
12853				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12854					/* a collision took us forward? */
12855					queue_only = 0;
12856				} else {
12857					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12858					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12859					queue_only = 1;
12860				}
12861			}
12862			if ((net->flight_size > net->cwnd) &&
12863			    (asoc->sctp_cmt_on_off == 0)) {
12864				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12865				queue_only = 1;
12866			} else if (asoc->ifp_had_enobuf) {
12867				SCTP_STAT_INCR(sctps_ifnomemqueued);
12868				if (net->flight_size > (2 * net->mtu)) {
12869					queue_only = 1;
12870				}
12871				asoc->ifp_had_enobuf = 0;
12872			}
12873			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12874			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12875			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12876			    (stcb->asoc.total_flight > 0) &&
12877			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12878			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12879
12880				/*-
12881				 * Ok, Nagle is set on and we have data outstanding.
12882				 * Don't send anything and let SACKs drive out the
12883				 * data unless wen have a "full" segment to send.
12884				 */
12885				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12886					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12887				}
12888				SCTP_STAT_INCR(sctps_naglequeued);
12889				nagle_applies = 1;
12890			} else {
12891				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12892					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12893						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12894				}
12895				SCTP_STAT_INCR(sctps_naglesent);
12896				nagle_applies = 0;
12897			}
12898			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12899
12900				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12901				    nagle_applies, un_sent);
12902				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12903				    stcb->asoc.total_flight,
12904				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12905			}
12906			if (queue_only_for_init)
12907				queue_only_for_init = 0;
12908			if ((queue_only == 0) && (nagle_applies == 0)) {
12909				/*-
12910				 * need to start chunk output
12911				 * before blocking.. note that if
12912				 * a lock is already applied, then
12913				 * the input via the net is happening
12914				 * and I don't need to start output :-D
12915				 */
12916				if (hold_tcblock == 0) {
12917					if (SCTP_TCB_TRYLOCK(stcb)) {
12918						hold_tcblock = 1;
12919						sctp_chunk_output(inp,
12920						    stcb,
12921						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12922					}
12923				} else {
12924					sctp_chunk_output(inp,
12925					    stcb,
12926					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12927				}
12928				if (hold_tcblock == 1) {
12929					SCTP_TCB_UNLOCK(stcb);
12930					hold_tcblock = 0;
12931				}
12932			}
12933			SOCKBUF_LOCK(&so->so_snd);
12934			/*-
12935			 * This is a bit strange, but I think it will
12936			 * work. The total_output_queue_size is locked and
12937			 * protected by the TCB_LOCK, which we just released.
12938			 * There is a race that can occur between releasing it
12939			 * above, and me getting the socket lock, where sacks
12940			 * come in but we have not put the SB_WAIT on the
12941			 * so_snd buffer to get the wakeup. After the LOCK
12942			 * is applied the sack_processing will also need to
12943			 * LOCK the so->so_snd to do the actual sowwakeup(). So
12944			 * once we have the socket buffer lock if we recheck the
12945			 * size we KNOW we will get to sleep safely with the
12946			 * wakeup flag in place.
12947			 */
12948			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12949			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12950				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12951					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12952					    asoc, uio->uio_resid);
12953				}
12954				be.error = 0;
12955				stcb->block_entry = &be;
12956				error = sbwait(&so->so_snd);
12957				stcb->block_entry = NULL;
12958
12959				if (error || so->so_error || be.error) {
12960					if (error == 0) {
12961						if (so->so_error)
12962							error = so->so_error;
12963						if (be.error) {
12964							error = be.error;
12965						}
12966					}
12967					SOCKBUF_UNLOCK(&so->so_snd);
12968					goto out_unlocked;
12969				}
12970				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12971					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12972					    asoc, stcb->asoc.total_output_queue_size);
12973				}
12974			}
12975			SOCKBUF_UNLOCK(&so->so_snd);
12976			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12977				goto out_unlocked;
12978			}
12979		}
12980		SCTP_TCB_SEND_LOCK(stcb);
12981		if (sp) {
12982			if (sp->msg_is_complete == 0) {
12983				strm->last_msg_incomplete = 1;
12984				asoc->stream_locked = 1;
12985				asoc->stream_locked_on = srcv->sinfo_stream;
12986			} else {
12987				sp->sender_all_done = 1;
12988				strm->last_msg_incomplete = 0;
12989				asoc->stream_locked = 0;
12990			}
12991		} else {
12992			SCTP_PRINTF("Huh no sp TSNH?\n");
12993			strm->last_msg_incomplete = 0;
12994			asoc->stream_locked = 0;
12995		}
12996		SCTP_TCB_SEND_UNLOCK(stcb);
12997		if (uio->uio_resid == 0) {
12998			got_all_of_the_send = 1;
12999		}
13000	} else {
13001		/* We send in a 0, since we do NOT have any locks */
13002		error = sctp_msg_append(stcb, net, top, srcv, 0);
13003		top = NULL;
13004		if (srcv->sinfo_flags & SCTP_EOF) {
13005			/*
13006			 * This should only happen for Panda for the mbuf
13007			 * send case, which does NOT yet support EEOR mode.
13008			 * Thus, we can just set this flag to do the proper
13009			 * EOF handling.
13010			 */
13011			got_all_of_the_send = 1;
13012		}
13013	}
13014	if (error) {
13015		goto out;
13016	}
13017dataless_eof:
13018	/* EOF thing ? */
13019	if ((srcv->sinfo_flags & SCTP_EOF) &&
13020	    (got_all_of_the_send == 1)) {
13021		int cnt;
13022
13023		SCTP_STAT_INCR(sctps_sends_with_eof);
13024		error = 0;
13025		if (hold_tcblock == 0) {
13026			SCTP_TCB_LOCK(stcb);
13027			hold_tcblock = 1;
13028		}
13029		cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13030		if (TAILQ_EMPTY(&asoc->send_queue) &&
13031		    TAILQ_EMPTY(&asoc->sent_queue) &&
13032		    (cnt == 0)) {
13033			if (asoc->locked_on_sending) {
13034				goto abort_anyway;
13035			}
13036			/* there is nothing queued to send, so I'm done... */
13037			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13038			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13039			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13040				struct sctp_nets *netp;
13041
13042				/* only send SHUTDOWN the first time through */
13043				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13044					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13045				}
13046				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13047				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13048				sctp_stop_timers_for_shutdown(stcb);
13049				if (stcb->asoc.alternate) {
13050					netp = stcb->asoc.alternate;
13051				} else {
13052					netp = stcb->asoc.primary_destination;
13053				}
13054				sctp_send_shutdown(stcb, netp);
13055				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13056				    netp);
13057				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13058				    asoc->primary_destination);
13059			}
13060		} else {
13061			/*-
13062			 * we still got (or just got) data to send, so set
13063			 * SHUTDOWN_PENDING
13064			 */
13065			/*-
13066			 * XXX sockets draft says that SCTP_EOF should be
13067			 * sent with no data.  currently, we will allow user
13068			 * data to be sent first and move to
13069			 * SHUTDOWN-PENDING
13070			 */
13071			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13072			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13073			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13074				if (hold_tcblock == 0) {
13075					SCTP_TCB_LOCK(stcb);
13076					hold_tcblock = 1;
13077				}
13078				if (asoc->locked_on_sending) {
13079					/* Locked to send out the data */
13080					struct sctp_stream_queue_pending *sp;
13081
13082					sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13083					if (sp) {
13084						if ((sp->length == 0) && (sp->msg_is_complete == 0))
13085							asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13086					}
13087				}
13088				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13089				if (TAILQ_EMPTY(&asoc->send_queue) &&
13090				    TAILQ_EMPTY(&asoc->sent_queue) &&
13091				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13092			abort_anyway:
13093					if (free_cnt_applied) {
13094						atomic_add_int(&stcb->asoc.refcnt, -1);
13095						free_cnt_applied = 0;
13096					}
13097					sctp_abort_an_association(stcb->sctp_ep, stcb,
13098					    NULL, SCTP_SO_LOCKED);
13099					/*
13100					 * now relock the stcb so everything
13101					 * is sane
13102					 */
13103					hold_tcblock = 0;
13104					stcb = NULL;
13105					goto out;
13106				}
13107				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13108				    asoc->primary_destination);
13109				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13110			}
13111		}
13112	}
13113skip_out_eof:
13114	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13115		some_on_control = 1;
13116	}
13117	if (queue_only_for_init) {
13118		if (hold_tcblock == 0) {
13119			SCTP_TCB_LOCK(stcb);
13120			hold_tcblock = 1;
13121		}
13122		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13123			/* a collision took us forward? */
13124			queue_only = 0;
13125		} else {
13126			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13127			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13128			queue_only = 1;
13129		}
13130	}
13131	if ((net->flight_size > net->cwnd) &&
13132	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13133		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13134		queue_only = 1;
13135	} else if (asoc->ifp_had_enobuf) {
13136		SCTP_STAT_INCR(sctps_ifnomemqueued);
13137		if (net->flight_size > (2 * net->mtu)) {
13138			queue_only = 1;
13139		}
13140		asoc->ifp_had_enobuf = 0;
13141	}
13142	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13143	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13144	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13145	    (stcb->asoc.total_flight > 0) &&
13146	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13147	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13148		/*-
13149		 * Ok, Nagle is set on and we have data outstanding.
13150		 * Don't send anything and let SACKs drive out the
13151		 * data unless wen have a "full" segment to send.
13152		 */
13153		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13154			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13155		}
13156		SCTP_STAT_INCR(sctps_naglequeued);
13157		nagle_applies = 1;
13158	} else {
13159		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13160			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13161				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13162		}
13163		SCTP_STAT_INCR(sctps_naglesent);
13164		nagle_applies = 0;
13165	}
13166	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13167		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13168		    nagle_applies, un_sent);
13169		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13170		    stcb->asoc.total_flight,
13171		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13172	}
13173	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13174		/* we can attempt to send too. */
13175		if (hold_tcblock == 0) {
13176			/*
13177			 * If there is activity recv'ing sacks no need to
13178			 * send
13179			 */
13180			if (SCTP_TCB_TRYLOCK(stcb)) {
13181				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13182				hold_tcblock = 1;
13183			}
13184		} else {
13185			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13186		}
13187	} else if ((queue_only == 0) &&
13188		    (stcb->asoc.peers_rwnd == 0) &&
13189	    (stcb->asoc.total_flight == 0)) {
13190		/* We get to have a probe outstanding */
13191		if (hold_tcblock == 0) {
13192			hold_tcblock = 1;
13193			SCTP_TCB_LOCK(stcb);
13194		}
13195		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13196	} else if (some_on_control) {
13197		int num_out, reason, frag_point;
13198
13199		/* Here we do control only */
13200		if (hold_tcblock == 0) {
13201			hold_tcblock = 1;
13202			SCTP_TCB_LOCK(stcb);
13203		}
13204		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13205		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13206		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13207	}
13208	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13209	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13210	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13211	    stcb->asoc.total_output_queue_size, error);
13212
13213out:
13214out_unlocked:
13215
13216	if (local_soresv && stcb) {
13217		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13218	}
13219	if (create_lock_applied) {
13220		SCTP_ASOC_CREATE_UNLOCK(inp);
13221	}
13222	if ((stcb) && hold_tcblock) {
13223		SCTP_TCB_UNLOCK(stcb);
13224	}
13225	if (stcb && free_cnt_applied) {
13226		atomic_add_int(&stcb->asoc.refcnt, -1);
13227	}
13228#ifdef INVARIANTS
13229	if (stcb) {
13230		if (mtx_owned(&stcb->tcb_mtx)) {
13231			panic("Leaving with tcb mtx owned?");
13232		}
13233		if (mtx_owned(&stcb->tcb_send_mtx)) {
13234			panic("Leaving with tcb send mtx owned?");
13235		}
13236	}
13237#endif
13238#ifdef INVARIANTS
13239	if (inp) {
13240		sctp_validate_no_locks(inp);
13241	} else {
13242		SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13243	}
13244#endif
13245	if (top) {
13246		sctp_m_freem(top);
13247	}
13248	if (control) {
13249		sctp_m_freem(control);
13250	}
13251	return (error);
13252}
13253
13254
13255/*
13256 * generate an AUTHentication chunk, if required
13257 */
13258struct mbuf *
13259sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13260    struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13261    struct sctp_tcb *stcb, uint8_t chunk)
13262{
13263	struct mbuf *m_auth;
13264	struct sctp_auth_chunk *auth;
13265	int chunk_len;
13266	struct mbuf *cn;
13267
13268	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13269	    (stcb == NULL))
13270		return (m);
13271
13272	/* sysctl disabled auth? */
13273	if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13274		return (m);
13275
13276	/* peer doesn't do auth... */
13277	if (!stcb->asoc.peer_supports_auth) {
13278		return (m);
13279	}
13280	/* does the requested chunk require auth? */
13281	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13282		return (m);
13283	}
13284	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13285	if (m_auth == NULL) {
13286		/* no mbuf's */
13287		return (m);
13288	}
13289	/* reserve some space if this will be the first mbuf */
13290	if (m == NULL)
13291		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13292	/* fill in the AUTH chunk details */
13293	auth = mtod(m_auth, struct sctp_auth_chunk *);
13294	bzero(auth, sizeof(*auth));
13295	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13296	auth->ch.chunk_flags = 0;
13297	chunk_len = sizeof(*auth) +
13298	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13299	auth->ch.chunk_length = htons(chunk_len);
13300	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13301	/* key id and hmac digest will be computed and filled in upon send */
13302
13303	/* save the offset where the auth was inserted into the chain */
13304	*offset = 0;
13305	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13306		*offset += SCTP_BUF_LEN(cn);
13307	}
13308
13309	/* update length and return pointer to the auth chunk */
13310	SCTP_BUF_LEN(m_auth) = chunk_len;
13311	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13312	if (auth_ret != NULL)
13313		*auth_ret = auth;
13314
13315	return (m);
13316}
13317
13318#ifdef INET6
13319int
13320sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13321{
13322	struct nd_prefix *pfx = NULL;
13323	struct nd_pfxrouter *pfxrtr = NULL;
13324	struct sockaddr_in6 gw6;
13325
13326	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13327		return (0);
13328
13329	/* get prefix entry of address */
13330	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13331		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13332			continue;
13333		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13334		    &src6->sin6_addr, &pfx->ndpr_mask))
13335			break;
13336	}
13337	/* no prefix entry in the prefix list */
13338	if (pfx == NULL) {
13339		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13340		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13341		return (0);
13342	}
13343	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13344	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13345
13346	/* search installed gateway from prefix entry */
13347	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13348		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13349		gw6.sin6_family = AF_INET6;
13350		gw6.sin6_len = sizeof(struct sockaddr_in6);
13351		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13352		    sizeof(struct in6_addr));
13353		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13354		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13355		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13356		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13357		if (sctp_cmpaddr((struct sockaddr *)&gw6,
13358		    ro->ro_rt->rt_gateway)) {
13359			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13360			return (1);
13361		}
13362	}
13363	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13364	return (0);
13365}
13366
13367#endif
13368
13369int
13370sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13371{
13372#ifdef INET
13373	struct sockaddr_in *sin, *mask;
13374	struct ifaddr *ifa;
13375	struct in_addr srcnetaddr, gwnetaddr;
13376
13377	if (ro == NULL || ro->ro_rt == NULL ||
13378	    sifa->address.sa.sa_family != AF_INET) {
13379		return (0);
13380	}
13381	ifa = (struct ifaddr *)sifa->ifa;
13382	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13383	sin = (struct sockaddr_in *)&sifa->address.sin;
13384	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13385	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13386	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13387	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13388
13389	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13390	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13391	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13392	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13393	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13394	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13395		return (1);
13396	}
13397#endif
13398	return (0);
13399}
13400