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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (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 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 *
9 * These functions manipulate an sctp event. The struct ulpevent is used
10 * to carry notifications and data to the ULP (sockets).
Vlad Yasevich60c778b2008-01-11 09:57:09 -050011 *
12 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * you can redistribute it and/or modify it under the terms of
14 * the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
16 * any later version.
17 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050018 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20 * ************************
21 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 * See the GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
Jeff Kirsher4b2f13a2013-12-06 06:28:48 -080025 * along with GNU CC; see the file COPYING. If not, see
26 * <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020030 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 * Written or modified by:
33 * Jon Grimm <jgrimm@us.ibm.com>
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Ardelle Fan <ardelle.fan@intel.com>
36 * Sridhar Samudrala <sri@us.ibm.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 */
38
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/types.h>
41#include <linux/skbuff.h>
42#include <net/sctp/structs.h>
43#include <net/sctp/sctp.h>
44#include <net/sctp/sm.h>
45
46static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
47 struct sctp_association *asoc);
48static void sctp_ulpevent_release_data(struct sctp_ulpevent *event);
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -070049static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event);
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052/* Initialize an ULP event from an given skb. */
Daniel Borkmanndda91922013-06-17 11:40:05 +020053static void sctp_ulpevent_init(struct sctp_ulpevent *event,
54 int msg_flags,
55 unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
57 memset(event, 0, sizeof(struct sctp_ulpevent));
58 event->msg_flags = msg_flags;
Vlad Yasevich331c4ee2006-10-09 21:34:04 -070059 event->rmem_len = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060}
61
62/* Create a new sctp_ulpevent. */
Daniel Borkmanndda91922013-06-17 11:40:05 +020063static struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags,
64 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
66 struct sctp_ulpevent *event;
67 struct sk_buff *skb;
68
69 skb = alloc_skb(size, gfp);
70 if (!skb)
71 goto fail;
72
73 event = sctp_skb2event(skb);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -070074 sctp_ulpevent_init(event, msg_flags, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76 return event;
77
78fail:
79 return NULL;
80}
81
82/* Is this a MSG_NOTIFICATION? */
83int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event)
84{
85 return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION);
86}
87
88/* Hold the association in case the msg_name needs read out of
89 * the association.
90 */
91static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event,
92 const struct sctp_association *asoc)
93{
94 struct sk_buff *skb;
95
96 /* Cast away the const, as we are just wanting to
97 * bump the reference count.
98 */
99 sctp_association_hold((struct sctp_association *)asoc);
100 skb = sctp_event2skb(event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 event->asoc = (struct sctp_association *)asoc;
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700102 atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
103 sctp_skb_set_owner_r(skb, asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
106/* A simple destructor to give up the reference to the association. */
107static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event)
108{
Neil Horman049b3ff2005-11-11 16:08:24 -0800109 struct sctp_association *asoc = event->asoc;
Neil Horman049b3ff2005-11-11 16:08:24 -0800110
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700111 atomic_sub(event->rmem_len, &asoc->rmem_alloc);
Neil Horman049b3ff2005-11-11 16:08:24 -0800112 sctp_association_put(asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
115/* Create and initialize an SCTP_ASSOC_CHANGE event.
116 *
117 * 5.3.1.1 SCTP_ASSOC_CHANGE
118 *
119 * Communication notifications inform the ULP that an SCTP association
120 * has either begun or ended. The identifier for a new association is
121 * provided by this notification.
122 *
123 * Note: There is no field checking here. If a field is unused it will be
124 * zero'd out.
125 */
126struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
127 const struct sctp_association *asoc,
128 __u16 flags, __u16 state, __u16 error, __u16 outbound,
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700129 __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
131 struct sctp_ulpevent *event;
132 struct sctp_assoc_change *sac;
133 struct sk_buff *skb;
134
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700135 /* If the lower layer passed in the chunk, it will be
136 * an ABORT, so we need to include it in the sac_info.
137 */
138 if (chunk) {
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700139 /* Copy the chunk data to a new skb and reserve enough
140 * head room to use as notification.
141 */
142 skb = skb_copy_expand(chunk->skb,
143 sizeof(struct sctp_assoc_change), 0, gfp);
144
145 if (!skb)
146 goto fail;
147
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700148 /* Embed the event fields inside the cloned skb. */
149 event = sctp_skb2event(skb);
150 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
151
152 /* Include the notification structure */
153 sac = (struct sctp_assoc_change *)
154 skb_push(skb, sizeof(struct sctp_assoc_change));
155
156 /* Trim the buffer to the right length. */
157 skb_trim(skb, sizeof(struct sctp_assoc_change) +
Vlad Yasevichac40e412007-05-09 13:52:35 -0700158 ntohs(chunk->chunk_hdr->length) -
159 sizeof(sctp_chunkhdr_t));
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700160 } else {
161 event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 MSG_NOTIFICATION, gfp);
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700163 if (!event)
164 goto fail;
165
166 skb = sctp_event2skb(event);
167 sac = (struct sctp_assoc_change *) skb_put(skb,
168 sizeof(struct sctp_assoc_change));
169 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 /* Socket Extensions for SCTP
172 * 5.3.1.1 SCTP_ASSOC_CHANGE
173 *
174 * sac_type:
175 * It should be SCTP_ASSOC_CHANGE.
176 */
177 sac->sac_type = SCTP_ASSOC_CHANGE;
178
179 /* Socket Extensions for SCTP
180 * 5.3.1.1 SCTP_ASSOC_CHANGE
181 *
182 * sac_state: 32 bits (signed integer)
183 * This field holds one of a number of values that communicate the
184 * event that happened to the association.
185 */
186 sac->sac_state = state;
187
188 /* Socket Extensions for SCTP
189 * 5.3.1.1 SCTP_ASSOC_CHANGE
190 *
191 * sac_flags: 16 bits (unsigned integer)
192 * Currently unused.
193 */
194 sac->sac_flags = 0;
195
196 /* Socket Extensions for SCTP
197 * 5.3.1.1 SCTP_ASSOC_CHANGE
198 *
199 * sac_length: sizeof (__u32)
200 * This field is the total length of the notification data, including
201 * the notification header.
202 */
Vlad Yasevichb90a1372008-02-14 10:18:20 -0500203 sac->sac_length = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 /* Socket Extensions for SCTP
206 * 5.3.1.1 SCTP_ASSOC_CHANGE
207 *
208 * sac_error: 32 bits (signed integer)
209 *
210 * If the state was reached due to a error condition (e.g.
211 * COMMUNICATION_LOST) any relevant error information is available in
212 * this field. This corresponds to the protocol error codes defined in
213 * [SCTP].
214 */
215 sac->sac_error = error;
216
217 /* Socket Extensions for SCTP
218 * 5.3.1.1 SCTP_ASSOC_CHANGE
219 *
220 * sac_outbound_streams: 16 bits (unsigned integer)
221 * sac_inbound_streams: 16 bits (unsigned integer)
222 *
223 * The maximum number of streams allowed in each direction are
224 * available in sac_outbound_streams and sac_inbound streams.
225 */
226 sac->sac_outbound_streams = outbound;
227 sac->sac_inbound_streams = inbound;
228
229 /* Socket Extensions for SCTP
230 * 5.3.1.1 SCTP_ASSOC_CHANGE
231 *
232 * sac_assoc_id: sizeof (sctp_assoc_t)
233 *
234 * The association id field, holds the identifier for the association.
235 * All notifications for a given association have the same association
236 * identifier. For TCP style socket, this field is ignored.
237 */
238 sctp_ulpevent_set_owner(event, asoc);
239 sac->sac_assoc_id = sctp_assoc2id(asoc);
240
241 return event;
242
243fail:
244 return NULL;
245}
246
247/* Create and initialize an SCTP_PEER_ADDR_CHANGE event.
248 *
249 * Socket Extensions for SCTP - draft-01
250 * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
251 *
252 * When a destination address on a multi-homed peer encounters a change
253 * an interface details event is sent.
254 */
255struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
256 const struct sctp_association *asoc,
257 const struct sockaddr_storage *aaddr,
Al Virodd0fc662005-10-07 07:46:04 +0100258 int flags, int state, int error, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259{
260 struct sctp_ulpevent *event;
261 struct sctp_paddr_change *spc;
262 struct sk_buff *skb;
263
264 event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change),
265 MSG_NOTIFICATION, gfp);
266 if (!event)
267 goto fail;
268
269 skb = sctp_event2skb(event);
270 spc = (struct sctp_paddr_change *)
271 skb_put(skb, sizeof(struct sctp_paddr_change));
272
273 /* Sockets API Extensions for SCTP
274 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
275 *
276 * spc_type:
277 *
278 * It should be SCTP_PEER_ADDR_CHANGE.
279 */
280 spc->spc_type = SCTP_PEER_ADDR_CHANGE;
281
282 /* Sockets API Extensions for SCTP
283 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
284 *
285 * spc_length: sizeof (__u32)
286 *
287 * This field is the total length of the notification data, including
288 * the notification header.
289 */
290 spc->spc_length = sizeof(struct sctp_paddr_change);
291
292 /* Sockets API Extensions for SCTP
293 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
294 *
295 * spc_flags: 16 bits (unsigned integer)
296 * Currently unused.
297 */
298 spc->spc_flags = 0;
299
300 /* Sockets API Extensions for SCTP
301 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
302 *
303 * spc_state: 32 bits (signed integer)
304 *
305 * This field holds one of a number of values that communicate the
306 * event that happened to the address.
307 */
308 spc->spc_state = state;
309
310 /* Sockets API Extensions for SCTP
311 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
312 *
313 * spc_error: 32 bits (signed integer)
314 *
315 * If the state was reached due to any error condition (e.g.
316 * ADDRESS_UNREACHABLE) any relevant error information is available in
317 * this field.
318 */
319 spc->spc_error = error;
320
321 /* Socket Extensions for SCTP
322 * 5.3.1.1 SCTP_ASSOC_CHANGE
323 *
324 * spc_assoc_id: sizeof (sctp_assoc_t)
325 *
326 * The association id field, holds the identifier for the association.
327 * All notifications for a given association have the same association
328 * identifier. For TCP style socket, this field is ignored.
329 */
330 sctp_ulpevent_set_owner(event, asoc);
331 spc->spc_assoc_id = sctp_assoc2id(asoc);
332
333 /* Sockets API Extensions for SCTP
334 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
335 *
336 * spc_aaddr: sizeof (struct sockaddr_storage)
337 *
338 * The affected address field, holds the remote peer's address that is
339 * encountering the change of state.
340 */
341 memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage));
342
343 /* Map ipv4 address into v4-mapped-on-v6 address. */
344 sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map(
345 sctp_sk(asoc->base.sk),
346 (union sctp_addr *)&spc->spc_aaddr);
347
348 return event;
349
350fail:
351 return NULL;
352}
353
354/* Create and initialize an SCTP_REMOTE_ERROR notification.
355 *
356 * Note: This assumes that the chunk->skb->data already points to the
357 * operation error payload.
358 *
359 * Socket Extensions for SCTP - draft-01
360 * 5.3.1.3 SCTP_REMOTE_ERROR
361 *
362 * A remote peer may send an Operational Error message to its peer.
363 * This message indicates a variety of error conditions on an
364 * association. The entire error TLV as it appears on the wire is
365 * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP
366 * specification [SCTP] and any extensions for a list of possible
367 * error formats.
368 */
369struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
370 const struct sctp_association *asoc, struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100371 __u16 flags, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
373 struct sctp_ulpevent *event;
374 struct sctp_remote_error *sre;
375 struct sk_buff *skb;
376 sctp_errhdr_t *ch;
Al Viro9f81bcd2006-11-20 17:26:34 -0800377 __be16 cause;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 int elen;
379
380 ch = (sctp_errhdr_t *)(chunk->skb->data);
381 cause = ch->cause;
382 elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);
383
384 /* Pull off the ERROR header. */
385 skb_pull(chunk->skb, sizeof(sctp_errhdr_t));
386
387 /* Copy the skb to a new skb with room for us to prepend
388 * notification with.
389 */
390 skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error),
391 0, gfp);
392
393 /* Pull off the rest of the cause TLV from the chunk. */
394 skb_pull(chunk->skb, elen);
395 if (!skb)
396 goto fail;
397
398 /* Embed the event fields inside the cloned skb. */
399 event = sctp_skb2event(skb);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700400 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 sre = (struct sctp_remote_error *)
403 skb_push(skb, sizeof(struct sctp_remote_error));
404
405 /* Trim the buffer to the right length. */
406 skb_trim(skb, sizeof(struct sctp_remote_error) + elen);
407
408 /* Socket Extensions for SCTP
409 * 5.3.1.3 SCTP_REMOTE_ERROR
410 *
411 * sre_type:
412 * It should be SCTP_REMOTE_ERROR.
413 */
414 sre->sre_type = SCTP_REMOTE_ERROR;
415
416 /*
417 * Socket Extensions for SCTP
418 * 5.3.1.3 SCTP_REMOTE_ERROR
419 *
420 * sre_flags: 16 bits (unsigned integer)
421 * Currently unused.
422 */
423 sre->sre_flags = 0;
424
425 /* Socket Extensions for SCTP
426 * 5.3.1.3 SCTP_REMOTE_ERROR
427 *
428 * sre_length: sizeof (__u32)
429 *
430 * This field is the total length of the notification data,
431 * including the notification header.
432 */
433 sre->sre_length = skb->len;
434
435 /* Socket Extensions for SCTP
436 * 5.3.1.3 SCTP_REMOTE_ERROR
437 *
438 * sre_error: 16 bits (unsigned integer)
439 * This value represents one of the Operational Error causes defined in
440 * the SCTP specification, in network byte order.
441 */
442 sre->sre_error = cause;
443
444 /* Socket Extensions for SCTP
445 * 5.3.1.3 SCTP_REMOTE_ERROR
446 *
447 * sre_assoc_id: sizeof (sctp_assoc_t)
448 *
449 * The association id field, holds the identifier for the association.
450 * All notifications for a given association have the same association
451 * identifier. For TCP style socket, this field is ignored.
452 */
453 sctp_ulpevent_set_owner(event, asoc);
454 sre->sre_assoc_id = sctp_assoc2id(asoc);
455
456 return event;
457
458fail:
459 return NULL;
460}
461
462/* Create and initialize a SCTP_SEND_FAILED notification.
463 *
464 * Socket Extensions for SCTP - draft-01
465 * 5.3.1.4 SCTP_SEND_FAILED
466 */
467struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
468 const struct sctp_association *asoc, struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100469 __u16 flags, __u32 error, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
471 struct sctp_ulpevent *event;
472 struct sctp_send_failed *ssf;
473 struct sk_buff *skb;
474
475 /* Pull off any padding. */
476 int len = ntohs(chunk->chunk_hdr->length);
477
478 /* Make skb with more room so we can prepend notification. */
479 skb = skb_copy_expand(chunk->skb,
480 sizeof(struct sctp_send_failed), /* headroom */
481 0, /* tailroom */
482 gfp);
483 if (!skb)
484 goto fail;
485
486 /* Pull off the common chunk header and DATA header. */
487 skb_pull(skb, sizeof(struct sctp_data_chunk));
488 len -= sizeof(struct sctp_data_chunk);
489
490 /* Embed the event fields inside the cloned skb. */
491 event = sctp_skb2event(skb);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700492 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 ssf = (struct sctp_send_failed *)
495 skb_push(skb, sizeof(struct sctp_send_failed));
496
497 /* Socket Extensions for SCTP
498 * 5.3.1.4 SCTP_SEND_FAILED
499 *
500 * ssf_type:
501 * It should be SCTP_SEND_FAILED.
502 */
503 ssf->ssf_type = SCTP_SEND_FAILED;
504
505 /* Socket Extensions for SCTP
506 * 5.3.1.4 SCTP_SEND_FAILED
507 *
508 * ssf_flags: 16 bits (unsigned integer)
509 * The flag value will take one of the following values
510 *
511 * SCTP_DATA_UNSENT - Indicates that the data was never put on
512 * the wire.
513 *
514 * SCTP_DATA_SENT - Indicates that the data was put on the wire.
515 * Note that this does not necessarily mean that the
516 * data was (or was not) successfully delivered.
517 */
518 ssf->ssf_flags = flags;
519
520 /* Socket Extensions for SCTP
521 * 5.3.1.4 SCTP_SEND_FAILED
522 *
523 * ssf_length: sizeof (__u32)
524 * This field is the total length of the notification data, including
525 * the notification header.
526 */
527 ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
528 skb_trim(skb, ssf->ssf_length);
529
530 /* Socket Extensions for SCTP
531 * 5.3.1.4 SCTP_SEND_FAILED
532 *
533 * ssf_error: 16 bits (unsigned integer)
534 * This value represents the reason why the send failed, and if set,
535 * will be a SCTP protocol error code as defined in [SCTP] section
536 * 3.3.10.
537 */
538 ssf->ssf_error = error;
539
540 /* Socket Extensions for SCTP
541 * 5.3.1.4 SCTP_SEND_FAILED
542 *
543 * ssf_info: sizeof (struct sctp_sndrcvinfo)
544 * The original send information associated with the undelivered
545 * message.
546 */
547 memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));
548
549 /* Per TSVWG discussion with Randy. Allow the application to
Lucas De Marchie9c54992011-04-26 23:28:26 -0700550 * reassemble a fragmented message.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 */
552 ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;
553
554 /* Socket Extensions for SCTP
555 * 5.3.1.4 SCTP_SEND_FAILED
556 *
557 * ssf_assoc_id: sizeof (sctp_assoc_t)
558 * The association id field, sf_assoc_id, holds the identifier for the
559 * association. All notifications for a given association have the
560 * same association identifier. For TCP style socket, this field is
561 * ignored.
562 */
563 sctp_ulpevent_set_owner(event, asoc);
564 ssf->ssf_assoc_id = sctp_assoc2id(asoc);
565 return event;
566
567fail:
568 return NULL;
569}
570
571/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
572 *
573 * Socket Extensions for SCTP - draft-01
574 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
575 */
576struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
577 const struct sctp_association *asoc,
Al Virodd0fc662005-10-07 07:46:04 +0100578 __u16 flags, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
580 struct sctp_ulpevent *event;
581 struct sctp_shutdown_event *sse;
582 struct sk_buff *skb;
583
584 event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
585 MSG_NOTIFICATION, gfp);
586 if (!event)
587 goto fail;
588
589 skb = sctp_event2skb(event);
590 sse = (struct sctp_shutdown_event *)
591 skb_put(skb, sizeof(struct sctp_shutdown_event));
592
593 /* Socket Extensions for SCTP
594 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
595 *
596 * sse_type
597 * It should be SCTP_SHUTDOWN_EVENT
598 */
599 sse->sse_type = SCTP_SHUTDOWN_EVENT;
600
601 /* Socket Extensions for SCTP
602 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
603 *
604 * sse_flags: 16 bits (unsigned integer)
605 * Currently unused.
606 */
607 sse->sse_flags = 0;
608
609 /* Socket Extensions for SCTP
610 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
611 *
612 * sse_length: sizeof (__u32)
613 * This field is the total length of the notification data, including
614 * the notification header.
615 */
616 sse->sse_length = sizeof(struct sctp_shutdown_event);
617
618 /* Socket Extensions for SCTP
619 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
620 *
621 * sse_assoc_id: sizeof (sctp_assoc_t)
622 * The association id field, holds the identifier for the association.
623 * All notifications for a given association have the same association
624 * identifier. For TCP style socket, this field is ignored.
625 */
626 sctp_ulpevent_set_owner(event, asoc);
627 sse->sse_assoc_id = sctp_assoc2id(asoc);
628
629 return event;
630
631fail:
632 return NULL;
633}
634
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800635/* Create and initialize a SCTP_ADAPTATION_INDICATION notification.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 *
637 * Socket Extensions for SCTP
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800638 * 5.3.1.6 SCTP_ADAPTATION_INDICATION
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 */
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800640struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
Al Virodd0fc662005-10-07 07:46:04 +0100641 const struct sctp_association *asoc, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642{
643 struct sctp_ulpevent *event;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800644 struct sctp_adaptation_event *sai;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 struct sk_buff *skb;
646
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800647 event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 MSG_NOTIFICATION, gfp);
649 if (!event)
650 goto fail;
651
652 skb = sctp_event2skb(event);
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800653 sai = (struct sctp_adaptation_event *)
654 skb_put(skb, sizeof(struct sctp_adaptation_event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800656 sai->sai_type = SCTP_ADAPTATION_INDICATION;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 sai->sai_flags = 0;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800658 sai->sai_length = sizeof(struct sctp_adaptation_event);
659 sai->sai_adaptation_ind = asoc->peer.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 sctp_ulpevent_set_owner(event, asoc);
661 sai->sai_assoc_id = sctp_assoc2id(asoc);
662
663 return event;
664
665fail:
666 return NULL;
667}
668
669/* A message has been received. Package this message as a notification
670 * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo
671 * even if filtered out later.
672 *
673 * Socket Extensions for SCTP
674 * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
675 */
676struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
677 struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100678 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
680 struct sctp_ulpevent *event = NULL;
681 struct sk_buff *skb;
682 size_t padding, len;
Neil Horman4d93df02007-08-15 16:07:44 -0700683 int rx_count;
684
685 /*
686 * check to see if we need to make space for this
687 * new skb, expand the rcvbuffer if needed, or drop
688 * the frame
689 */
690 if (asoc->ep->rcvbuf_policy)
691 rx_count = atomic_read(&asoc->rmem_alloc);
692 else
693 rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc);
694
695 if (rx_count >= asoc->base.sk->sk_rcvbuf) {
696
697 if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
Mel Gormanc76562b2012-07-31 16:44:41 -0700698 (!sk_rmem_schedule(asoc->base.sk, chunk->skb,
699 chunk->skb->truesize)))
Neil Horman4d93df02007-08-15 16:07:44 -0700700 goto fail;
701 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 /* Clone the original skb, sharing the data. */
704 skb = skb_clone(chunk->skb, gfp);
705 if (!skb)
706 goto fail;
707
Vlad Yasevich3888e9e2008-07-08 02:28:39 -0700708 /* Now that all memory allocations for this chunk succeeded, we
709 * can mark it as received so the tsn_map is updated correctly.
710 */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700711 if (sctp_tsnmap_mark(&asoc->peer.tsn_map,
Neil Horman42448542012-06-30 03:04:26 +0000712 ntohl(chunk->subh.data_hdr->tsn),
713 chunk->transport))
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700714 goto fail_mark;
Vlad Yasevich3888e9e2008-07-08 02:28:39 -0700715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 /* First calculate the padding, so we don't inadvertently
717 * pass up the wrong length to the user.
718 *
719 * RFC 2960 - Section 3.2 Chunk Field Descriptions
720 *
721 * The total length of a chunk(including Type, Length and Value fields)
722 * MUST be a multiple of 4 bytes. If the length of the chunk is not a
723 * multiple of 4 bytes, the sender MUST pad the chunk with all zero
724 * bytes and this padding is not included in the chunk length field.
725 * The sender should never pad with more than 3 bytes. The receiver
726 * MUST ignore the padding bytes.
727 */
728 len = ntohs(chunk->chunk_hdr->length);
729 padding = WORD_ROUND(len) - len;
730
731 /* Fixup cloned skb with just this chunks data. */
732 skb_trim(skb, chunk->chunk_end - padding - skb->data);
733
734 /* Embed the event fields inside the cloned skb. */
735 event = sctp_skb2event(skb);
736
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700737 /* Initialize event with flags 0 and correct length
738 * Since this is a clone of the original skb, only account for
739 * the data of this chunk as other chunks will be accounted separately.
740 */
741 sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
743 sctp_ulpevent_receive_data(event, asoc);
744
745 event->stream = ntohs(chunk->subh.data_hdr->stream);
746 event->ssn = ntohs(chunk->subh.data_hdr->ssn);
747 event->ppid = chunk->subh.data_hdr->ppid;
748 if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700749 event->flags |= SCTP_UNORDERED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
751 }
752 event->tsn = ntohl(chunk->subh.data_hdr->tsn);
753 event->msg_flags |= chunk->chunk_hdr->flags;
754 event->iif = sctp_chunk_iif(chunk);
755
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 return event;
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700757
758fail_mark:
759 kfree_skb(skb);
760fail:
761 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762}
763
764/* Create a partial delivery related event.
765 *
766 * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
767 *
768 * When a receiver is engaged in a partial delivery of a
769 * message this notification will be used to indicate
770 * various events.
771 */
772struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700773 const struct sctp_association *asoc, __u32 indication,
Al Virodd0fc662005-10-07 07:46:04 +0100774 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775{
776 struct sctp_ulpevent *event;
777 struct sctp_pdapi_event *pd;
778 struct sk_buff *skb;
779
780 event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
781 MSG_NOTIFICATION, gfp);
782 if (!event)
783 goto fail;
784
785 skb = sctp_event2skb(event);
786 pd = (struct sctp_pdapi_event *)
787 skb_put(skb, sizeof(struct sctp_pdapi_event));
788
789 /* pdapi_type
790 * It should be SCTP_PARTIAL_DELIVERY_EVENT
791 *
792 * pdapi_flags: 16 bits (unsigned integer)
793 * Currently unused.
794 */
795 pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
796 pd->pdapi_flags = 0;
797
798 /* pdapi_length: 32 bits (unsigned integer)
799 *
800 * This field is the total length of the notification data, including
801 * the notification header. It will generally be sizeof (struct
802 * sctp_pdapi_event).
803 */
804 pd->pdapi_length = sizeof(struct sctp_pdapi_event);
805
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900806 /* pdapi_indication: 32 bits (unsigned integer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 *
808 * This field holds the indication being sent to the application.
809 */
810 pd->pdapi_indication = indication;
811
812 /* pdapi_assoc_id: sizeof (sctp_assoc_t)
813 *
814 * The association id field, holds the identifier for the association.
815 */
816 sctp_ulpevent_set_owner(event, asoc);
817 pd->pdapi_assoc_id = sctp_assoc2id(asoc);
818
819 return event;
820fail:
821 return NULL;
822}
823
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700824struct sctp_ulpevent *sctp_ulpevent_make_authkey(
825 const struct sctp_association *asoc, __u16 key_id,
826 __u32 indication, gfp_t gfp)
827{
828 struct sctp_ulpevent *event;
829 struct sctp_authkey_event *ak;
830 struct sk_buff *skb;
831
832 event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
833 MSG_NOTIFICATION, gfp);
834 if (!event)
835 goto fail;
836
837 skb = sctp_event2skb(event);
838 ak = (struct sctp_authkey_event *)
839 skb_put(skb, sizeof(struct sctp_authkey_event));
840
Wei Yongjunee916fd2011-04-17 17:28:01 +0000841 ak->auth_type = SCTP_AUTHENTICATION_EVENT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700842 ak->auth_flags = 0;
843 ak->auth_length = sizeof(struct sctp_authkey_event);
844
845 ak->auth_keynumber = key_id;
846 ak->auth_altkeynumber = 0;
847 ak->auth_indication = indication;
848
849 /*
850 * The association id field, holds the identifier for the association.
851 */
852 sctp_ulpevent_set_owner(event, asoc);
853 ak->auth_assoc_id = sctp_assoc2id(asoc);
854
855 return event;
856fail:
857 return NULL;
858}
859
Wei Yongjune1cdd552011-04-17 17:29:03 +0000860/*
861 * Socket Extensions for SCTP
862 * 6.3.10. SCTP_SENDER_DRY_EVENT
863 */
864struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
865 const struct sctp_association *asoc, gfp_t gfp)
866{
867 struct sctp_ulpevent *event;
868 struct sctp_sender_dry_event *sdry;
869 struct sk_buff *skb;
870
871 event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
872 MSG_NOTIFICATION, gfp);
873 if (!event)
874 return NULL;
875
876 skb = sctp_event2skb(event);
877 sdry = (struct sctp_sender_dry_event *)
878 skb_put(skb, sizeof(struct sctp_sender_dry_event));
879
880 sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
881 sdry->sender_dry_flags = 0;
882 sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
883 sctp_ulpevent_set_owner(event, asoc);
884 sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
885
886 return event;
887}
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700888
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889/* Return the notification type, assuming this is a notification
890 * event.
891 */
892__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
893{
894 union sctp_notification *notification;
895 struct sk_buff *skb;
896
Vlad Yasevichab38fb02008-04-12 18:40:06 -0700897 skb = sctp_event2skb(event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 notification = (union sctp_notification *) skb->data;
899 return notification->sn_header.sn_type;
900}
901
902/* Copy out the sndrcvinfo into a msghdr. */
903void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
904 struct msghdr *msghdr)
905{
906 struct sctp_sndrcvinfo sinfo;
907
908 if (sctp_ulpevent_is_notification(event))
909 return;
910
911 /* Sockets API Extensions for SCTP
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900912 * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
913 *
914 * sinfo_stream: 16 bits (unsigned integer)
915 *
916 * For recvmsg() the SCTP stack places the message's stream number in
917 * this value.
918 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 sinfo.sinfo_stream = event->stream;
920 /* sinfo_ssn: 16 bits (unsigned integer)
921 *
922 * For recvmsg() this value contains the stream sequence number that
923 * the remote endpoint placed in the DATA chunk. For fragmented
924 * messages this is the same number for all deliveries of the message
925 * (if more than one recvmsg() is needed to read the message).
926 */
927 sinfo.sinfo_ssn = event->ssn;
928 /* sinfo_ppid: 32 bits (unsigned integer)
929 *
930 * In recvmsg() this value is
931 * the same information that was passed by the upper layer in the peer
932 * application. Please note that byte order issues are NOT accounted
933 * for and this information is passed opaquely by the SCTP stack from
934 * one end to the other.
935 */
936 sinfo.sinfo_ppid = event->ppid;
937 /* sinfo_flags: 16 bits (unsigned integer)
938 *
939 * This field may contain any of the following flags and is composed of
940 * a bitwise OR of these values.
941 *
942 * recvmsg() flags:
943 *
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700944 * SCTP_UNORDERED - This flag is present when the message was sent
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 * non-ordered.
946 */
947 sinfo.sinfo_flags = event->flags;
948 /* sinfo_tsn: 32 bit (unsigned integer)
949 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900950 * For the receiving side, this field holds a TSN that was
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 * assigned to one of the SCTP Data Chunks.
952 */
953 sinfo.sinfo_tsn = event->tsn;
954 /* sinfo_cumtsn: 32 bit (unsigned integer)
955 *
956 * This field will hold the current cumulative TSN as
957 * known by the underlying SCTP layer. Note this field is
958 * ignored when sending and only valid for a receive
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700959 * operation when sinfo_flags are set to SCTP_UNORDERED.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 */
961 sinfo.sinfo_cumtsn = event->cumtsn;
962 /* sinfo_assoc_id: sizeof (sctp_assoc_t)
963 *
964 * The association handle field, sinfo_assoc_id, holds the identifier
965 * for the association announced in the COMMUNICATION_UP notification.
966 * All notifications for a given association have the same identifier.
967 * Ignored for one-to-one style sockets.
968 */
969 sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
970
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -0800971 /* context value that is set via SCTP_CONTEXT socket option. */
972 sinfo.sinfo_context = event->asoc->default_rcv_context;
973
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 /* These fields are not used while receiving. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 sinfo.sinfo_timetolive = 0;
976
977 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
978 sizeof(struct sctp_sndrcvinfo), (void *)&sinfo);
979}
980
981/* Do accounting for bytes received and hold a reference to the association
982 * for each skb.
983 */
984static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
985 struct sctp_association *asoc)
986{
987 struct sk_buff *skb, *frag;
988
989 skb = sctp_event2skb(event);
990 /* Set the owner and charge rwnd for bytes received. */
991 sctp_ulpevent_set_owner(event, asoc);
Daniel Borkmann362d5202014-04-14 21:45:17 +0200992 sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993
994 if (!skb->data_len)
995 return;
996
997 /* Note: Not clearing the entire event struct as this is just a
998 * fragment of the real event. However, we still need to do rwnd
999 * accounting.
1000 * In general, the skb passed from IP can have only 1 level of
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001001 * fragments. But we allow multiple levels of fragments.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 */
David S. Miller1b003be2009-06-09 00:22:35 -07001003 skb_walk_frags(skb, frag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005}
1006
1007/* Do accounting for bytes just read by user and release the references to
1008 * the association.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001009 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
1011{
1012 struct sk_buff *skb, *frag;
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001013 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
1015 /* Current stack structures assume that the rcv buffer is
1016 * per socket. For UDP style sockets this is not true as
1017 * multiple associations may be on a single UDP-style socket.
1018 * Use the local private area of the skb to track the owning
1019 * association.
1020 */
1021
1022 skb = sctp_event2skb(event);
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001023 len = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
1025 if (!skb->data_len)
1026 goto done;
1027
1028 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07001029 skb_walk_frags(skb, frag) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 /* NOTE: skb_shinfos are recursive. Although IP returns
1031 * skb's with only 1 level of fragments, SCTP reassembly can
1032 * increase the levels.
1033 */
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001034 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1035 }
1036
1037done:
Daniel Borkmann362d5202014-04-14 21:45:17 +02001038 sctp_assoc_rwnd_increase(event->asoc, len);
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001039 sctp_ulpevent_release_owner(event);
1040}
1041
1042static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
1043{
1044 struct sk_buff *skb, *frag;
1045
1046 skb = sctp_event2skb(event);
1047
1048 if (!skb->data_len)
1049 goto done;
1050
1051 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07001052 skb_walk_frags(skb, frag) {
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001053 /* NOTE: skb_shinfos are recursive. Although IP returns
1054 * skb's with only 1 level of fragments, SCTP reassembly can
1055 * increase the levels.
1056 */
1057 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 }
1059
1060done:
1061 sctp_ulpevent_release_owner(event);
1062}
1063
1064/* Free a ulpevent that has an owner. It includes releasing the reference
1065 * to the owner, updating the rwnd in case of a DATA event and freeing the
1066 * skb.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 */
1068void sctp_ulpevent_free(struct sctp_ulpevent *event)
1069{
1070 if (sctp_ulpevent_is_notification(event))
1071 sctp_ulpevent_release_owner(event);
1072 else
1073 sctp_ulpevent_release_data(event);
1074
1075 kfree_skb(sctp_event2skb(event));
1076}
1077
1078/* Purge the skb lists holding ulpevents. */
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001079unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080{
1081 struct sk_buff *skb;
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001082 unsigned int data_unread = 0;
1083
1084 while ((skb = skb_dequeue(list)) != NULL) {
1085 struct sctp_ulpevent *event = sctp_skb2event(skb);
1086
1087 if (!sctp_ulpevent_is_notification(event))
1088 data_unread += skb->len;
1089
1090 sctp_ulpevent_free(event);
1091 }
1092
1093 return data_unread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094}