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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux/fpc-iii.git] / net / sctp / stream.c
blob76ea66be0bbee7d3f018676d52c8b95ba06dbcb1
1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * These functions manipulate sctp tsn mapping array.
10 *
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, see
25 * <http://www.gnu.org/licenses/>.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 * lksctp developers <linux-sctp@vger.kernel.org>
30 *
31 * Written or modified by:
32 * Xin Long <lucien.xin@gmail.com>
33 */
34
35 #include <linux/list.h>
36 #include <net/sctp/sctp.h>
37 #include <net/sctp/sm.h>
38 #include <net/sctp/stream_sched.h>
39
40 /* Migrates chunks from stream queues to new stream queues if needed,
41 * but not across associations. Also, removes those chunks to streams
42 * higher than the new max.
43 */
44 static void sctp_stream_outq_migrate(struct sctp_stream *stream,
45 struct sctp_stream *new, __u16 outcnt)
46 {
47 struct sctp_association *asoc;
48 struct sctp_chunk *ch, *temp;
49 struct sctp_outq *outq;
50 int i;
51
52 asoc = container_of(stream, struct sctp_association, stream);
53 outq = &asoc->outqueue;
54
55 list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
56 __u16 sid = sctp_chunk_stream_no(ch);
57
58 if (sid < outcnt)
59 continue;
60
61 sctp_sched_dequeue_common(outq, ch);
62 /* No need to call dequeue_done here because
63 * the chunks are not scheduled by now.
64 */
65
66 /* Mark as failed send. */
67 sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM);
68 if (asoc->peer.prsctp_capable &&
69 SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
70 asoc->sent_cnt_removable--;
71
72 sctp_chunk_free(ch);
73 }
74
75 if (new) {
76 /* Here we actually move the old ext stuff into the new
77 * buffer, because we want to keep it. Then
78 * sctp_stream_update will swap ->out pointers.
79 */
80 for (i = 0; i < outcnt; i++) {
81 kfree(new->out[i].ext);
82 new->out[i].ext = stream->out[i].ext;
83 stream->out[i].ext = NULL;
84 }
85 }
86
87 for (i = outcnt; i < stream->outcnt; i++)
88 kfree(stream->out[i].ext);
89 }
90
91 static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
92 gfp_t gfp)
93 {
94 struct sctp_stream_out *out;
95
96 out = kmalloc_array(outcnt, sizeof(*out), gfp);
97 if (!out)
98 return -ENOMEM;
99
100 if (stream->out) {
101 memcpy(out, stream->out, min(outcnt, stream->outcnt) *
102 sizeof(*out));
103 kfree(stream->out);
104 }
105
106 if (outcnt > stream->outcnt)
107 memset(out + stream->outcnt, 0,
108 (outcnt - stream->outcnt) * sizeof(*out));
109
110 stream->out = out;
111
112 return 0;
113 }
114
115 static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
116 gfp_t gfp)
117 {
118 struct sctp_stream_in *in;
119
120 in = kmalloc_array(incnt, sizeof(*stream->in), gfp);
121
122 if (!in)
123 return -ENOMEM;
124
125 if (stream->in) {
126 memcpy(in, stream->in, min(incnt, stream->incnt) *
127 sizeof(*in));
128 kfree(stream->in);
129 }
130
131 if (incnt > stream->incnt)
132 memset(in + stream->incnt, 0,
133 (incnt - stream->incnt) * sizeof(*in));
134
135 stream->in = in;
136
137 return 0;
138 }
139
140 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
141 gfp_t gfp)
142 {
143 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
144 int i, ret = 0;
145
146 gfp |= __GFP_NOWARN;
147
148 /* Initial stream->out size may be very big, so free it and alloc
149 * a new one with new outcnt to save memory if needed.
150 */
151 if (outcnt == stream->outcnt)
152 goto in;
153
154 /* Filter out chunks queued on streams that won't exist anymore */
155 sched->unsched_all(stream);
156 sctp_stream_outq_migrate(stream, NULL, outcnt);
157 sched->sched_all(stream);
158
159 i = sctp_stream_alloc_out(stream, outcnt, gfp);
160 if (i)
161 return i;
162
163 stream->outcnt = outcnt;
164 for (i = 0; i < stream->outcnt; i++)
165 stream->out[i].state = SCTP_STREAM_OPEN;
166
167 sched->init(stream);
168
169 in:
170 if (!incnt)
171 goto out;
172
173 i = sctp_stream_alloc_in(stream, incnt, gfp);
174 if (i) {
175 ret = -ENOMEM;
176 goto free;
177 }
178
179 stream->incnt = incnt;
180 goto out;
181
182 free:
183 sched->free(stream);
184 kfree(stream->out);
185 stream->out = NULL;
186 out:
187 return ret;
188 }
189
190 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
191 {
192 struct sctp_stream_out_ext *soute;
193
194 soute = kzalloc(sizeof(*soute), GFP_KERNEL);
195 if (!soute)
196 return -ENOMEM;
197 stream->out[sid].ext = soute;
198
199 return sctp_sched_init_sid(stream, sid, GFP_KERNEL);
200 }
201
202 void sctp_stream_free(struct sctp_stream *stream)
203 {
204 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
205 int i;
206
207 sched->free(stream);
208 for (i = 0; i < stream->outcnt; i++)
209 kfree(stream->out[i].ext);
210 kfree(stream->out);
211 kfree(stream->in);
212 }
213
214 void sctp_stream_clear(struct sctp_stream *stream)
215 {
216 int i;
217
218 for (i = 0; i < stream->outcnt; i++)
219 stream->out[i].ssn = 0;
220
221 for (i = 0; i < stream->incnt; i++)
222 stream->in[i].ssn = 0;
223 }
224
225 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
226 {
227 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
228
229 sched->unsched_all(stream);
230 sctp_stream_outq_migrate(stream, new, new->outcnt);
231 sctp_stream_free(stream);
232
233 stream->out = new->out;
234 stream->in = new->in;
235 stream->outcnt = new->outcnt;
236 stream->incnt = new->incnt;
237
238 sched->sched_all(stream);
239
240 new->out = NULL;
241 new->in = NULL;
242 }
243
244 static int sctp_send_reconf(struct sctp_association *asoc,
245 struct sctp_chunk *chunk)
246 {
247 struct net *net = sock_net(asoc->base.sk);
248 int retval = 0;
249
250 retval = sctp_primitive_RECONF(net, asoc, chunk);
251 if (retval)
252 sctp_chunk_free(chunk);
253
254 return retval;
255 }
256
257 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
258 __u16 str_nums, __be16 *str_list)
259 {
260 struct sctp_association *asoc;
261 __u16 i;
262
263 asoc = container_of(stream, struct sctp_association, stream);
264 if (!asoc->outqueue.out_qlen)
265 return true;
266
267 if (!str_nums)
268 return false;
269
270 for (i = 0; i < str_nums; i++) {
271 __u16 sid = ntohs(str_list[i]);
272
273 if (stream->out[sid].ext &&
274 !list_empty(&stream->out[sid].ext->outq))
275 return false;
276 }
277
278 return true;
279 }
280
281 int sctp_send_reset_streams(struct sctp_association *asoc,
282 struct sctp_reset_streams *params)
283 {
284 struct sctp_stream *stream = &asoc->stream;
285 __u16 i, str_nums, *str_list;
286 struct sctp_chunk *chunk;
287 int retval = -EINVAL;
288 __be16 *nstr_list;
289 bool out, in;
290
291 if (!asoc->peer.reconf_capable ||
292 !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
293 retval = -ENOPROTOOPT;
294 goto out;
295 }
296
297 if (asoc->strreset_outstanding) {
298 retval = -EINPROGRESS;
299 goto out;
300 }
301
302 out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
303 in = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
304 if (!out && !in)
305 goto out;
306
307 str_nums = params->srs_number_streams;
308 str_list = params->srs_stream_list;
309 if (str_nums) {
310 int param_len = 0;
311
312 if (out) {
313 for (i = 0; i < str_nums; i++)
314 if (str_list[i] >= stream->outcnt)
315 goto out;
316
317 param_len = str_nums * sizeof(__u16) +
318 sizeof(struct sctp_strreset_outreq);
319 }
320
321 if (in) {
322 for (i = 0; i < str_nums; i++)
323 if (str_list[i] >= stream->incnt)
324 goto out;
325
326 param_len += str_nums * sizeof(__u16) +
327 sizeof(struct sctp_strreset_inreq);
328 }
329
330 if (param_len > SCTP_MAX_CHUNK_LEN -
331 sizeof(struct sctp_reconf_chunk))
332 goto out;
333 }
334
335 nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
336 if (!nstr_list) {
337 retval = -ENOMEM;
338 goto out;
339 }
340
341 for (i = 0; i < str_nums; i++)
342 nstr_list[i] = htons(str_list[i]);
343
344 if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
345 retval = -EAGAIN;
346 goto out;
347 }
348
349 chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
350
351 kfree(nstr_list);
352
353 if (!chunk) {
354 retval = -ENOMEM;
355 goto out;
356 }
357
358 if (out) {
359 if (str_nums)
360 for (i = 0; i < str_nums; i++)
361 stream->out[str_list[i]].state =
362 SCTP_STREAM_CLOSED;
363 else
364 for (i = 0; i < stream->outcnt; i++)
365 stream->out[i].state = SCTP_STREAM_CLOSED;
366 }
367
368 asoc->strreset_chunk = chunk;
369 sctp_chunk_hold(asoc->strreset_chunk);
370
371 retval = sctp_send_reconf(asoc, chunk);
372 if (retval) {
373 sctp_chunk_put(asoc->strreset_chunk);
374 asoc->strreset_chunk = NULL;
375 if (!out)
376 goto out;
377
378 if (str_nums)
379 for (i = 0; i < str_nums; i++)
380 stream->out[str_list[i]].state =
381 SCTP_STREAM_OPEN;
382 else
383 for (i = 0; i < stream->outcnt; i++)
384 stream->out[i].state = SCTP_STREAM_OPEN;
385
386 goto out;
387 }
388
389 asoc->strreset_outstanding = out + in;
390
391 out:
392 return retval;
393 }
394
395 int sctp_send_reset_assoc(struct sctp_association *asoc)
396 {
397 struct sctp_stream *stream = &asoc->stream;
398 struct sctp_chunk *chunk = NULL;
399 int retval;
400 __u16 i;
401
402 if (!asoc->peer.reconf_capable ||
403 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
404 return -ENOPROTOOPT;
405
406 if (asoc->strreset_outstanding)
407 return -EINPROGRESS;
408
409 if (!sctp_outq_is_empty(&asoc->outqueue))
410 return -EAGAIN;
411
412 chunk = sctp_make_strreset_tsnreq(asoc);
413 if (!chunk)
414 return -ENOMEM;
415
416 /* Block further xmit of data until this request is completed */
417 for (i = 0; i < stream->outcnt; i++)
418 stream->out[i].state = SCTP_STREAM_CLOSED;
419
420 asoc->strreset_chunk = chunk;
421 sctp_chunk_hold(asoc->strreset_chunk);
422
423 retval = sctp_send_reconf(asoc, chunk);
424 if (retval) {
425 sctp_chunk_put(asoc->strreset_chunk);
426 asoc->strreset_chunk = NULL;
427
428 for (i = 0; i < stream->outcnt; i++)
429 stream->out[i].state = SCTP_STREAM_OPEN;
430
431 return retval;
432 }
433
434 asoc->strreset_outstanding = 1;
435
436 return 0;
437 }
438
439 int sctp_send_add_streams(struct sctp_association *asoc,
440 struct sctp_add_streams *params)
441 {
442 struct sctp_stream *stream = &asoc->stream;
443 struct sctp_chunk *chunk = NULL;
444 int retval;
445 __u32 outcnt, incnt;
446 __u16 out, in;
447
448 if (!asoc->peer.reconf_capable ||
449 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
450 retval = -ENOPROTOOPT;
451 goto out;
452 }
453
454 if (asoc->strreset_outstanding) {
455 retval = -EINPROGRESS;
456 goto out;
457 }
458
459 out = params->sas_outstrms;
460 in = params->sas_instrms;
461 outcnt = stream->outcnt + out;
462 incnt = stream->incnt + in;
463 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
464 (!out && !in)) {
465 retval = -EINVAL;
466 goto out;
467 }
468
469 if (out) {
470 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
471 if (retval)
472 goto out;
473 }
474
475 chunk = sctp_make_strreset_addstrm(asoc, out, in);
476 if (!chunk) {
477 retval = -ENOMEM;
478 goto out;
479 }
480
481 asoc->strreset_chunk = chunk;
482 sctp_chunk_hold(asoc->strreset_chunk);
483
484 retval = sctp_send_reconf(asoc, chunk);
485 if (retval) {
486 sctp_chunk_put(asoc->strreset_chunk);
487 asoc->strreset_chunk = NULL;
488 goto out;
489 }
490
491 stream->incnt = incnt;
492 stream->outcnt = outcnt;
493
494 asoc->strreset_outstanding = !!out + !!in;
495
496 out:
497 return retval;
498 }
499
500 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
501 struct sctp_association *asoc, __be32 resp_seq,
502 __be16 type)
503 {
504 struct sctp_chunk *chunk = asoc->strreset_chunk;
505 struct sctp_reconf_chunk *hdr;
506 union sctp_params param;
507
508 if (!chunk)
509 return NULL;
510
511 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
512 sctp_walk_params(param, hdr, params) {
513 /* sctp_strreset_tsnreq is actually the basic structure
514 * of all stream reconf params, so it's safe to use it
515 * to access request_seq.
516 */
517 struct sctp_strreset_tsnreq *req = param.v;
518
519 if ((!resp_seq || req->request_seq == resp_seq) &&
520 (!type || type == req->param_hdr.type))
521 return param.v;
522 }
523
524 return NULL;
525 }
526
527 static void sctp_update_strreset_result(struct sctp_association *asoc,
528 __u32 result)
529 {
530 asoc->strreset_result[1] = asoc->strreset_result[0];
531 asoc->strreset_result[0] = result;
532 }
533
534 struct sctp_chunk *sctp_process_strreset_outreq(
535 struct sctp_association *asoc,
536 union sctp_params param,
537 struct sctp_ulpevent **evp)
538 {
539 struct sctp_strreset_outreq *outreq = param.v;
540 struct sctp_stream *stream = &asoc->stream;
541 __u32 result = SCTP_STRRESET_DENIED;
542 __u16 i, nums, flags = 0;
543 __be16 *str_p = NULL;
544 __u32 request_seq;
545
546 request_seq = ntohl(outreq->request_seq);
547
548 if (ntohl(outreq->send_reset_at_tsn) >
549 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
550 result = SCTP_STRRESET_IN_PROGRESS;
551 goto err;
552 }
553
554 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
555 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
556 result = SCTP_STRRESET_ERR_BAD_SEQNO;
557 goto err;
558 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
559 i = asoc->strreset_inseq - request_seq - 1;
560 result = asoc->strreset_result[i];
561 goto err;
562 }
563 asoc->strreset_inseq++;
564
565 /* Check strreset_enable after inseq inc, as sender cannot tell
566 * the peer doesn't enable strreset after receiving response with
567 * result denied, as well as to keep consistent with bsd.
568 */
569 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
570 goto out;
571
572 if (asoc->strreset_chunk) {
573 if (!sctp_chunk_lookup_strreset_param(
574 asoc, outreq->response_seq,
575 SCTP_PARAM_RESET_IN_REQUEST)) {
576 /* same process with outstanding isn't 0 */
577 result = SCTP_STRRESET_ERR_IN_PROGRESS;
578 goto out;
579 }
580
581 asoc->strreset_outstanding--;
582 asoc->strreset_outseq++;
583
584 if (!asoc->strreset_outstanding) {
585 struct sctp_transport *t;
586
587 t = asoc->strreset_chunk->transport;
588 if (del_timer(&t->reconf_timer))
589 sctp_transport_put(t);
590
591 sctp_chunk_put(asoc->strreset_chunk);
592 asoc->strreset_chunk = NULL;
593 }
594
595 flags = SCTP_STREAM_RESET_INCOMING_SSN;
596 }
597
598 nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
599 if (nums) {
600 str_p = outreq->list_of_streams;
601 for (i = 0; i < nums; i++) {
602 if (ntohs(str_p[i]) >= stream->incnt) {
603 result = SCTP_STRRESET_ERR_WRONG_SSN;
604 goto out;
605 }
606 }
607
608 for (i = 0; i < nums; i++)
609 stream->in[ntohs(str_p[i])].ssn = 0;
610 } else {
611 for (i = 0; i < stream->incnt; i++)
612 stream->in[i].ssn = 0;
613 }
614
615 result = SCTP_STRRESET_PERFORMED;
616
617 *evp = sctp_ulpevent_make_stream_reset_event(asoc,
618 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
619 GFP_ATOMIC);
620
621 out:
622 sctp_update_strreset_result(asoc, result);
623 err:
624 return sctp_make_strreset_resp(asoc, result, request_seq);
625 }
626
627 struct sctp_chunk *sctp_process_strreset_inreq(
628 struct sctp_association *asoc,
629 union sctp_params param,
630 struct sctp_ulpevent **evp)
631 {
632 struct sctp_strreset_inreq *inreq = param.v;
633 struct sctp_stream *stream = &asoc->stream;
634 __u32 result = SCTP_STRRESET_DENIED;
635 struct sctp_chunk *chunk = NULL;
636 __u32 request_seq;
637 __u16 i, nums;
638 __be16 *str_p;
639
640 request_seq = ntohl(inreq->request_seq);
641 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
642 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
643 result = SCTP_STRRESET_ERR_BAD_SEQNO;
644 goto err;
645 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
646 i = asoc->strreset_inseq - request_seq - 1;
647 result = asoc->strreset_result[i];
648 if (result == SCTP_STRRESET_PERFORMED)
649 return NULL;
650 goto err;
651 }
652 asoc->strreset_inseq++;
653
654 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
655 goto out;
656
657 if (asoc->strreset_outstanding) {
658 result = SCTP_STRRESET_ERR_IN_PROGRESS;
659 goto out;
660 }
661
662 nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
663 str_p = inreq->list_of_streams;
664 for (i = 0; i < nums; i++) {
665 if (ntohs(str_p[i]) >= stream->outcnt) {
666 result = SCTP_STRRESET_ERR_WRONG_SSN;
667 goto out;
668 }
669 }
670
671 if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
672 result = SCTP_STRRESET_IN_PROGRESS;
673 asoc->strreset_inseq--;
674 goto err;
675 }
676
677 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
678 if (!chunk)
679 goto out;
680
681 if (nums)
682 for (i = 0; i < nums; i++)
683 stream->out[ntohs(str_p[i])].state =
684 SCTP_STREAM_CLOSED;
685 else
686 for (i = 0; i < stream->outcnt; i++)
687 stream->out[i].state = SCTP_STREAM_CLOSED;
688
689 asoc->strreset_chunk = chunk;
690 asoc->strreset_outstanding = 1;
691 sctp_chunk_hold(asoc->strreset_chunk);
692
693 result = SCTP_STRRESET_PERFORMED;
694
695 *evp = sctp_ulpevent_make_stream_reset_event(asoc,
696 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
697
698 out:
699 sctp_update_strreset_result(asoc, result);
700 err:
701 if (!chunk)
702 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
703
704 return chunk;
705 }
706
707 struct sctp_chunk *sctp_process_strreset_tsnreq(
708 struct sctp_association *asoc,
709 union sctp_params param,
710 struct sctp_ulpevent **evp)
711 {
712 __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
713 struct sctp_strreset_tsnreq *tsnreq = param.v;
714 struct sctp_stream *stream = &asoc->stream;
715 __u32 result = SCTP_STRRESET_DENIED;
716 __u32 request_seq;
717 __u16 i;
718
719 request_seq = ntohl(tsnreq->request_seq);
720 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
721 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
722 result = SCTP_STRRESET_ERR_BAD_SEQNO;
723 goto err;
724 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
725 i = asoc->strreset_inseq - request_seq - 1;
726 result = asoc->strreset_result[i];
727 if (result == SCTP_STRRESET_PERFORMED) {
728 next_tsn = asoc->ctsn_ack_point + 1;
729 init_tsn =
730 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
731 }
732 goto err;
733 }
734
735 if (!sctp_outq_is_empty(&asoc->outqueue)) {
736 result = SCTP_STRRESET_IN_PROGRESS;
737 goto err;
738 }
739
740 asoc->strreset_inseq++;
741
742 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
743 goto out;
744
745 if (asoc->strreset_outstanding) {
746 result = SCTP_STRRESET_ERR_IN_PROGRESS;
747 goto out;
748 }
749
750 /* G4: The same processing as though a FWD-TSN chunk (as defined in
751 * [RFC3758]) with all streams affected and a new cumulative TSN
752 * ACK of the Receiver's Next TSN minus 1 were received MUST be
753 * performed.
754 */
755 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
756 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, max_tsn_seen);
757 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
758
759 /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
760 * TSN that the peer should use to send the next DATA chunk. The
761 * value SHOULD be the smallest TSN not acknowledged by the
762 * receiver of the request plus 2^31.
763 */
764 init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
765 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
766 init_tsn, GFP_ATOMIC);
767
768 /* G3: The same processing as though a SACK chunk with no gap report
769 * and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
770 * received MUST be performed.
771 */
772 sctp_outq_free(&asoc->outqueue);
773
774 /* G2: Compute an appropriate value for the local endpoint's next TSN,
775 * i.e., the next TSN assigned by the receiver of the SSN/TSN reset
776 * chunk. The value SHOULD be the highest TSN sent by the receiver
777 * of the request plus 1.
778 */
779 next_tsn = asoc->next_tsn;
780 asoc->ctsn_ack_point = next_tsn - 1;
781 asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
782
783 /* G5: The next expected and outgoing SSNs MUST be reset to 0 for all
784 * incoming and outgoing streams.
785 */
786 for (i = 0; i < stream->outcnt; i++)
787 stream->out[i].ssn = 0;
788 for (i = 0; i < stream->incnt; i++)
789 stream->in[i].ssn = 0;
790
791 result = SCTP_STRRESET_PERFORMED;
792
793 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
794 next_tsn, GFP_ATOMIC);
795
796 out:
797 sctp_update_strreset_result(asoc, result);
798 err:
799 return sctp_make_strreset_tsnresp(asoc, result, request_seq,
800 next_tsn, init_tsn);
801 }
802
803 struct sctp_chunk *sctp_process_strreset_addstrm_out(
804 struct sctp_association *asoc,
805 union sctp_params param,
806 struct sctp_ulpevent **evp)
807 {
808 struct sctp_strreset_addstrm *addstrm = param.v;
809 struct sctp_stream *stream = &asoc->stream;
810 __u32 result = SCTP_STRRESET_DENIED;
811 __u32 request_seq, incnt;
812 __u16 in, i;
813
814 request_seq = ntohl(addstrm->request_seq);
815 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
816 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
817 result = SCTP_STRRESET_ERR_BAD_SEQNO;
818 goto err;
819 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
820 i = asoc->strreset_inseq - request_seq - 1;
821 result = asoc->strreset_result[i];
822 goto err;
823 }
824 asoc->strreset_inseq++;
825
826 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
827 goto out;
828
829 if (asoc->strreset_chunk) {
830 if (!sctp_chunk_lookup_strreset_param(
831 asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
832 /* same process with outstanding isn't 0 */
833 result = SCTP_STRRESET_ERR_IN_PROGRESS;
834 goto out;
835 }
836
837 asoc->strreset_outstanding--;
838 asoc->strreset_outseq++;
839
840 if (!asoc->strreset_outstanding) {
841 struct sctp_transport *t;
842
843 t = asoc->strreset_chunk->transport;
844 if (del_timer(&t->reconf_timer))
845 sctp_transport_put(t);
846
847 sctp_chunk_put(asoc->strreset_chunk);
848 asoc->strreset_chunk = NULL;
849 }
850 }
851
852 in = ntohs(addstrm->number_of_streams);
853 incnt = stream->incnt + in;
854 if (!in || incnt > SCTP_MAX_STREAM)
855 goto out;
856
857 if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
858 goto out;
859
860 stream->incnt = incnt;
861
862 result = SCTP_STRRESET_PERFORMED;
863
864 *evp = sctp_ulpevent_make_stream_change_event(asoc,
865 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
866
867 out:
868 sctp_update_strreset_result(asoc, result);
869 err:
870 return sctp_make_strreset_resp(asoc, result, request_seq);
871 }
872
873 struct sctp_chunk *sctp_process_strreset_addstrm_in(
874 struct sctp_association *asoc,
875 union sctp_params param,
876 struct sctp_ulpevent **evp)
877 {
878 struct sctp_strreset_addstrm *addstrm = param.v;
879 struct sctp_stream *stream = &asoc->stream;
880 __u32 result = SCTP_STRRESET_DENIED;
881 struct sctp_chunk *chunk = NULL;
882 __u32 request_seq, outcnt;
883 __u16 out, i;
884 int ret;
885
886 request_seq = ntohl(addstrm->request_seq);
887 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
888 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
889 result = SCTP_STRRESET_ERR_BAD_SEQNO;
890 goto err;
891 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
892 i = asoc->strreset_inseq - request_seq - 1;
893 result = asoc->strreset_result[i];
894 if (result == SCTP_STRRESET_PERFORMED)
895 return NULL;
896 goto err;
897 }
898 asoc->strreset_inseq++;
899
900 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
901 goto out;
902
903 if (asoc->strreset_outstanding) {
904 result = SCTP_STRRESET_ERR_IN_PROGRESS;
905 goto out;
906 }
907
908 out = ntohs(addstrm->number_of_streams);
909 outcnt = stream->outcnt + out;
910 if (!out || outcnt > SCTP_MAX_STREAM)
911 goto out;
912
913 ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
914 if (ret)
915 goto out;
916
917 chunk = sctp_make_strreset_addstrm(asoc, out, 0);
918 if (!chunk)
919 goto out;
920
921 asoc->strreset_chunk = chunk;
922 asoc->strreset_outstanding = 1;
923 sctp_chunk_hold(asoc->strreset_chunk);
924
925 stream->outcnt = outcnt;
926
927 result = SCTP_STRRESET_PERFORMED;
928
929 *evp = sctp_ulpevent_make_stream_change_event(asoc,
930 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
931
932 out:
933 sctp_update_strreset_result(asoc, result);
934 err:
935 if (!chunk)
936 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
937
938 return chunk;
939 }
940
941 struct sctp_chunk *sctp_process_strreset_resp(
942 struct sctp_association *asoc,
943 union sctp_params param,
944 struct sctp_ulpevent **evp)
945 {
946 struct sctp_stream *stream = &asoc->stream;
947 struct sctp_strreset_resp *resp = param.v;
948 struct sctp_transport *t;
949 __u16 i, nums, flags = 0;
950 struct sctp_paramhdr *req;
951 __u32 result;
952
953 req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
954 if (!req)
955 return NULL;
956
957 result = ntohl(resp->result);
958 if (result != SCTP_STRRESET_PERFORMED) {
959 /* if in progress, do nothing but retransmit */
960 if (result == SCTP_STRRESET_IN_PROGRESS)
961 return NULL;
962 else if (result == SCTP_STRRESET_DENIED)
963 flags = SCTP_STREAM_RESET_DENIED;
964 else
965 flags = SCTP_STREAM_RESET_FAILED;
966 }
967
968 if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
969 struct sctp_strreset_outreq *outreq;
970 __be16 *str_p;
971
972 outreq = (struct sctp_strreset_outreq *)req;
973 str_p = outreq->list_of_streams;
974 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
975 sizeof(__u16);
976
977 if (result == SCTP_STRRESET_PERFORMED) {
978 if (nums) {
979 for (i = 0; i < nums; i++)
980 stream->out[ntohs(str_p[i])].ssn = 0;
981 } else {
982 for (i = 0; i < stream->outcnt; i++)
983 stream->out[i].ssn = 0;
984 }
985
986 flags = SCTP_STREAM_RESET_OUTGOING_SSN;
987 }
988
989 for (i = 0; i < stream->outcnt; i++)
990 stream->out[i].state = SCTP_STREAM_OPEN;
991
992 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
993 nums, str_p, GFP_ATOMIC);
994 } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
995 struct sctp_strreset_inreq *inreq;
996 __be16 *str_p;
997
998 /* if the result is performed, it's impossible for inreq */
999 if (result == SCTP_STRRESET_PERFORMED)
1000 return NULL;
1001
1002 inreq = (struct sctp_strreset_inreq *)req;
1003 str_p = inreq->list_of_streams;
1004 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
1005 sizeof(__u16);
1006
1007 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1008 nums, str_p, GFP_ATOMIC);
1009 } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
1010 struct sctp_strreset_resptsn *resptsn;
1011 __u32 stsn, rtsn;
1012
1013 /* check for resptsn, as sctp_verify_reconf didn't do it*/
1014 if (ntohs(param.p->length) != sizeof(*resptsn))
1015 return NULL;
1016
1017 resptsn = (struct sctp_strreset_resptsn *)resp;
1018 stsn = ntohl(resptsn->senders_next_tsn);
1019 rtsn = ntohl(resptsn->receivers_next_tsn);
1020
1021 if (result == SCTP_STRRESET_PERFORMED) {
1022 __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
1023 &asoc->peer.tsn_map);
1024 LIST_HEAD(temp);
1025
1026 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, mtsn);
1027 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1028
1029 sctp_tsnmap_init(&asoc->peer.tsn_map,
1030 SCTP_TSN_MAP_INITIAL,
1031 stsn, GFP_ATOMIC);
1032
1033 /* Clean up sacked and abandoned queues only. As the
1034 * out_chunk_list may not be empty, splice it to temp,
1035 * then get it back after sctp_outq_free is done.
1036 */
1037 list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1038 sctp_outq_free(&asoc->outqueue);
1039 list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1040
1041 asoc->next_tsn = rtsn;
1042 asoc->ctsn_ack_point = asoc->next_tsn - 1;
1043 asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1044
1045 for (i = 0; i < stream->outcnt; i++)
1046 stream->out[i].ssn = 0;
1047 for (i = 0; i < stream->incnt; i++)
1048 stream->in[i].ssn = 0;
1049 }
1050
1051 for (i = 0; i < stream->outcnt; i++)
1052 stream->out[i].state = SCTP_STREAM_OPEN;
1053
1054 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1055 stsn, rtsn, GFP_ATOMIC);
1056 } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1057 struct sctp_strreset_addstrm *addstrm;
1058 __u16 number;
1059
1060 addstrm = (struct sctp_strreset_addstrm *)req;
1061 nums = ntohs(addstrm->number_of_streams);
1062 number = stream->outcnt - nums;
1063
1064 if (result == SCTP_STRRESET_PERFORMED)
1065 for (i = number; i < stream->outcnt; i++)
1066 stream->out[i].state = SCTP_STREAM_OPEN;
1067 else
1068 stream->outcnt = number;
1069
1070 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1071 0, nums, GFP_ATOMIC);
1072 } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1073 struct sctp_strreset_addstrm *addstrm;
1074
1075 /* if the result is performed, it's impossible for addstrm in
1076 * request.
1077 */
1078 if (result == SCTP_STRRESET_PERFORMED)
1079 return NULL;
1080
1081 addstrm = (struct sctp_strreset_addstrm *)req;
1082 nums = ntohs(addstrm->number_of_streams);
1083
1084 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1085 nums, 0, GFP_ATOMIC);
1086 }
1087
1088 asoc->strreset_outstanding--;
1089 asoc->strreset_outseq++;
1090
1091 /* remove everything for this reconf request */
1092 if (!asoc->strreset_outstanding) {
1093 t = asoc->strreset_chunk->transport;
1094 if (del_timer(&t->reconf_timer))
1095 sctp_transport_put(t);
1096
1097 sctp_chunk_put(asoc->strreset_chunk);
1098 asoc->strreset_chunk = NULL;
1099 }
1100
1101 return NULL;
1102 }
Linux with added FPC-III support