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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. */
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600344 sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_to_user(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 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 */
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200369struct sctp_ulpevent *
370sctp_ulpevent_make_remote_error(const struct sctp_association *asoc,
371 struct sctp_chunk *chunk, __u16 flags,
372 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
374 struct sctp_ulpevent *event;
375 struct sctp_remote_error *sre;
376 struct sk_buff *skb;
377 sctp_errhdr_t *ch;
Al Viro9f81bcd2006-11-20 17:26:34 -0800378 __be16 cause;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 int elen;
380
381 ch = (sctp_errhdr_t *)(chunk->skb->data);
382 cause = ch->cause;
383 elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);
384
385 /* Pull off the ERROR header. */
386 skb_pull(chunk->skb, sizeof(sctp_errhdr_t));
387
388 /* Copy the skb to a new skb with room for us to prepend
389 * notification with.
390 */
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200391 skb = skb_copy_expand(chunk->skb, sizeof(*sre), 0, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
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
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200402 sre = (struct sctp_remote_error *) skb_push(skb, sizeof(*sre));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404 /* Trim the buffer to the right length. */
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200405 skb_trim(skb, sizeof(*sre) + elen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200407 /* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */
408 memset(sre, 0, sizeof(*sre));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 sre->sre_type = SCTP_REMOTE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 sre->sre_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 sre->sre_length = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 sre->sre_error = cause;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 sctp_ulpevent_set_owner(event, asoc);
414 sre->sre_assoc_id = sctp_assoc2id(asoc);
415
416 return event;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417fail:
418 return NULL;
419}
420
421/* Create and initialize a SCTP_SEND_FAILED notification.
422 *
423 * Socket Extensions for SCTP - draft-01
424 * 5.3.1.4 SCTP_SEND_FAILED
425 */
426struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
427 const struct sctp_association *asoc, struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100428 __u16 flags, __u32 error, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
430 struct sctp_ulpevent *event;
431 struct sctp_send_failed *ssf;
432 struct sk_buff *skb;
433
434 /* Pull off any padding. */
435 int len = ntohs(chunk->chunk_hdr->length);
436
437 /* Make skb with more room so we can prepend notification. */
438 skb = skb_copy_expand(chunk->skb,
439 sizeof(struct sctp_send_failed), /* headroom */
440 0, /* tailroom */
441 gfp);
442 if (!skb)
443 goto fail;
444
445 /* Pull off the common chunk header and DATA header. */
446 skb_pull(skb, sizeof(struct sctp_data_chunk));
447 len -= sizeof(struct sctp_data_chunk);
448
449 /* Embed the event fields inside the cloned skb. */
450 event = sctp_skb2event(skb);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700451 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453 ssf = (struct sctp_send_failed *)
454 skb_push(skb, sizeof(struct sctp_send_failed));
455
456 /* Socket Extensions for SCTP
457 * 5.3.1.4 SCTP_SEND_FAILED
458 *
459 * ssf_type:
460 * It should be SCTP_SEND_FAILED.
461 */
462 ssf->ssf_type = SCTP_SEND_FAILED;
463
464 /* Socket Extensions for SCTP
465 * 5.3.1.4 SCTP_SEND_FAILED
466 *
467 * ssf_flags: 16 bits (unsigned integer)
468 * The flag value will take one of the following values
469 *
470 * SCTP_DATA_UNSENT - Indicates that the data was never put on
471 * the wire.
472 *
473 * SCTP_DATA_SENT - Indicates that the data was put on the wire.
474 * Note that this does not necessarily mean that the
475 * data was (or was not) successfully delivered.
476 */
477 ssf->ssf_flags = flags;
478
479 /* Socket Extensions for SCTP
480 * 5.3.1.4 SCTP_SEND_FAILED
481 *
482 * ssf_length: sizeof (__u32)
483 * This field is the total length of the notification data, including
484 * the notification header.
485 */
486 ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
487 skb_trim(skb, ssf->ssf_length);
488
489 /* Socket Extensions for SCTP
490 * 5.3.1.4 SCTP_SEND_FAILED
491 *
492 * ssf_error: 16 bits (unsigned integer)
493 * This value represents the reason why the send failed, and if set,
494 * will be a SCTP protocol error code as defined in [SCTP] section
495 * 3.3.10.
496 */
497 ssf->ssf_error = error;
498
499 /* Socket Extensions for SCTP
500 * 5.3.1.4 SCTP_SEND_FAILED
501 *
502 * ssf_info: sizeof (struct sctp_sndrcvinfo)
503 * The original send information associated with the undelivered
504 * message.
505 */
506 memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));
507
508 /* Per TSVWG discussion with Randy. Allow the application to
Lucas De Marchie9c54992011-04-26 23:28:26 -0700509 * reassemble a fragmented message.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 */
511 ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;
512
513 /* Socket Extensions for SCTP
514 * 5.3.1.4 SCTP_SEND_FAILED
515 *
516 * ssf_assoc_id: sizeof (sctp_assoc_t)
517 * The association id field, sf_assoc_id, holds the identifier for the
518 * association. All notifications for a given association have the
519 * same association identifier. For TCP style socket, this field is
520 * ignored.
521 */
522 sctp_ulpevent_set_owner(event, asoc);
523 ssf->ssf_assoc_id = sctp_assoc2id(asoc);
524 return event;
525
526fail:
527 return NULL;
528}
529
530/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
531 *
532 * Socket Extensions for SCTP - draft-01
533 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
534 */
535struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
536 const struct sctp_association *asoc,
Al Virodd0fc662005-10-07 07:46:04 +0100537 __u16 flags, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
539 struct sctp_ulpevent *event;
540 struct sctp_shutdown_event *sse;
541 struct sk_buff *skb;
542
543 event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
544 MSG_NOTIFICATION, gfp);
545 if (!event)
546 goto fail;
547
548 skb = sctp_event2skb(event);
549 sse = (struct sctp_shutdown_event *)
550 skb_put(skb, sizeof(struct sctp_shutdown_event));
551
552 /* Socket Extensions for SCTP
553 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
554 *
555 * sse_type
556 * It should be SCTP_SHUTDOWN_EVENT
557 */
558 sse->sse_type = SCTP_SHUTDOWN_EVENT;
559
560 /* Socket Extensions for SCTP
561 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
562 *
563 * sse_flags: 16 bits (unsigned integer)
564 * Currently unused.
565 */
566 sse->sse_flags = 0;
567
568 /* Socket Extensions for SCTP
569 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
570 *
571 * sse_length: sizeof (__u32)
572 * This field is the total length of the notification data, including
573 * the notification header.
574 */
575 sse->sse_length = sizeof(struct sctp_shutdown_event);
576
577 /* Socket Extensions for SCTP
578 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
579 *
580 * sse_assoc_id: sizeof (sctp_assoc_t)
581 * The association id field, holds the identifier for the association.
582 * All notifications for a given association have the same association
583 * identifier. For TCP style socket, this field is ignored.
584 */
585 sctp_ulpevent_set_owner(event, asoc);
586 sse->sse_assoc_id = sctp_assoc2id(asoc);
587
588 return event;
589
590fail:
591 return NULL;
592}
593
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800594/* Create and initialize a SCTP_ADAPTATION_INDICATION notification.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 *
596 * Socket Extensions for SCTP
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800597 * 5.3.1.6 SCTP_ADAPTATION_INDICATION
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 */
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800599struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
Al Virodd0fc662005-10-07 07:46:04 +0100600 const struct sctp_association *asoc, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601{
602 struct sctp_ulpevent *event;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800603 struct sctp_adaptation_event *sai;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 struct sk_buff *skb;
605
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800606 event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 MSG_NOTIFICATION, gfp);
608 if (!event)
609 goto fail;
610
611 skb = sctp_event2skb(event);
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800612 sai = (struct sctp_adaptation_event *)
613 skb_put(skb, sizeof(struct sctp_adaptation_event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800615 sai->sai_type = SCTP_ADAPTATION_INDICATION;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 sai->sai_flags = 0;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800617 sai->sai_length = sizeof(struct sctp_adaptation_event);
618 sai->sai_adaptation_ind = asoc->peer.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 sctp_ulpevent_set_owner(event, asoc);
620 sai->sai_assoc_id = sctp_assoc2id(asoc);
621
622 return event;
623
624fail:
625 return NULL;
626}
627
628/* A message has been received. Package this message as a notification
629 * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo
630 * even if filtered out later.
631 *
632 * Socket Extensions for SCTP
633 * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
634 */
635struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
636 struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100637 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
639 struct sctp_ulpevent *event = NULL;
640 struct sk_buff *skb;
641 size_t padding, len;
Neil Horman4d93df02007-08-15 16:07:44 -0700642 int rx_count;
643
644 /*
645 * check to see if we need to make space for this
646 * new skb, expand the rcvbuffer if needed, or drop
647 * the frame
648 */
649 if (asoc->ep->rcvbuf_policy)
650 rx_count = atomic_read(&asoc->rmem_alloc);
651 else
652 rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc);
653
654 if (rx_count >= asoc->base.sk->sk_rcvbuf) {
655
656 if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
Mel Gormanc76562b2012-07-31 16:44:41 -0700657 (!sk_rmem_schedule(asoc->base.sk, chunk->skb,
658 chunk->skb->truesize)))
Neil Horman4d93df02007-08-15 16:07:44 -0700659 goto fail;
660 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
662 /* Clone the original skb, sharing the data. */
663 skb = skb_clone(chunk->skb, gfp);
664 if (!skb)
665 goto fail;
666
Vlad Yasevich3888e9e2008-07-08 02:28:39 -0700667 /* Now that all memory allocations for this chunk succeeded, we
668 * can mark it as received so the tsn_map is updated correctly.
669 */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700670 if (sctp_tsnmap_mark(&asoc->peer.tsn_map,
Neil Horman42448542012-06-30 03:04:26 +0000671 ntohl(chunk->subh.data_hdr->tsn),
672 chunk->transport))
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700673 goto fail_mark;
Vlad Yasevich3888e9e2008-07-08 02:28:39 -0700674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 /* First calculate the padding, so we don't inadvertently
676 * pass up the wrong length to the user.
677 *
678 * RFC 2960 - Section 3.2 Chunk Field Descriptions
679 *
680 * The total length of a chunk(including Type, Length and Value fields)
681 * MUST be a multiple of 4 bytes. If the length of the chunk is not a
682 * multiple of 4 bytes, the sender MUST pad the chunk with all zero
683 * bytes and this padding is not included in the chunk length field.
684 * The sender should never pad with more than 3 bytes. The receiver
685 * MUST ignore the padding bytes.
686 */
687 len = ntohs(chunk->chunk_hdr->length);
688 padding = WORD_ROUND(len) - len;
689
690 /* Fixup cloned skb with just this chunks data. */
691 skb_trim(skb, chunk->chunk_end - padding - skb->data);
692
693 /* Embed the event fields inside the cloned skb. */
694 event = sctp_skb2event(skb);
695
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700696 /* Initialize event with flags 0 and correct length
697 * Since this is a clone of the original skb, only account for
698 * the data of this chunk as other chunks will be accounted separately.
699 */
700 sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702 sctp_ulpevent_receive_data(event, asoc);
703
704 event->stream = ntohs(chunk->subh.data_hdr->stream);
705 event->ssn = ntohs(chunk->subh.data_hdr->ssn);
706 event->ppid = chunk->subh.data_hdr->ppid;
707 if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700708 event->flags |= SCTP_UNORDERED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
710 }
711 event->tsn = ntohl(chunk->subh.data_hdr->tsn);
712 event->msg_flags |= chunk->chunk_hdr->flags;
713 event->iif = sctp_chunk_iif(chunk);
714
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 return event;
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700716
717fail_mark:
718 kfree_skb(skb);
719fail:
720 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721}
722
723/* Create a partial delivery related event.
724 *
725 * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
726 *
727 * When a receiver is engaged in a partial delivery of a
728 * message this notification will be used to indicate
729 * various events.
730 */
731struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700732 const struct sctp_association *asoc, __u32 indication,
Al Virodd0fc662005-10-07 07:46:04 +0100733 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734{
735 struct sctp_ulpevent *event;
736 struct sctp_pdapi_event *pd;
737 struct sk_buff *skb;
738
739 event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
740 MSG_NOTIFICATION, gfp);
741 if (!event)
742 goto fail;
743
744 skb = sctp_event2skb(event);
745 pd = (struct sctp_pdapi_event *)
746 skb_put(skb, sizeof(struct sctp_pdapi_event));
747
748 /* pdapi_type
749 * It should be SCTP_PARTIAL_DELIVERY_EVENT
750 *
751 * pdapi_flags: 16 bits (unsigned integer)
752 * Currently unused.
753 */
754 pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
755 pd->pdapi_flags = 0;
756
757 /* pdapi_length: 32 bits (unsigned integer)
758 *
759 * This field is the total length of the notification data, including
760 * the notification header. It will generally be sizeof (struct
761 * sctp_pdapi_event).
762 */
763 pd->pdapi_length = sizeof(struct sctp_pdapi_event);
764
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900765 /* pdapi_indication: 32 bits (unsigned integer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 *
767 * This field holds the indication being sent to the application.
768 */
769 pd->pdapi_indication = indication;
770
771 /* pdapi_assoc_id: sizeof (sctp_assoc_t)
772 *
773 * The association id field, holds the identifier for the association.
774 */
775 sctp_ulpevent_set_owner(event, asoc);
776 pd->pdapi_assoc_id = sctp_assoc2id(asoc);
777
778 return event;
779fail:
780 return NULL;
781}
782
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700783struct sctp_ulpevent *sctp_ulpevent_make_authkey(
784 const struct sctp_association *asoc, __u16 key_id,
785 __u32 indication, gfp_t gfp)
786{
787 struct sctp_ulpevent *event;
788 struct sctp_authkey_event *ak;
789 struct sk_buff *skb;
790
791 event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
792 MSG_NOTIFICATION, gfp);
793 if (!event)
794 goto fail;
795
796 skb = sctp_event2skb(event);
797 ak = (struct sctp_authkey_event *)
798 skb_put(skb, sizeof(struct sctp_authkey_event));
799
Wei Yongjunee916fd2011-04-17 17:28:01 +0000800 ak->auth_type = SCTP_AUTHENTICATION_EVENT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700801 ak->auth_flags = 0;
802 ak->auth_length = sizeof(struct sctp_authkey_event);
803
804 ak->auth_keynumber = key_id;
805 ak->auth_altkeynumber = 0;
806 ak->auth_indication = indication;
807
808 /*
809 * The association id field, holds the identifier for the association.
810 */
811 sctp_ulpevent_set_owner(event, asoc);
812 ak->auth_assoc_id = sctp_assoc2id(asoc);
813
814 return event;
815fail:
816 return NULL;
817}
818
Wei Yongjune1cdd552011-04-17 17:29:03 +0000819/*
820 * Socket Extensions for SCTP
821 * 6.3.10. SCTP_SENDER_DRY_EVENT
822 */
823struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
824 const struct sctp_association *asoc, gfp_t gfp)
825{
826 struct sctp_ulpevent *event;
827 struct sctp_sender_dry_event *sdry;
828 struct sk_buff *skb;
829
830 event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
831 MSG_NOTIFICATION, gfp);
832 if (!event)
833 return NULL;
834
835 skb = sctp_event2skb(event);
836 sdry = (struct sctp_sender_dry_event *)
837 skb_put(skb, sizeof(struct sctp_sender_dry_event));
838
839 sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
840 sdry->sender_dry_flags = 0;
841 sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
842 sctp_ulpevent_set_owner(event, asoc);
843 sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
844
845 return event;
846}
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700847
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848/* Return the notification type, assuming this is a notification
849 * event.
850 */
851__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
852{
853 union sctp_notification *notification;
854 struct sk_buff *skb;
855
Vlad Yasevichab38fb02008-04-12 18:40:06 -0700856 skb = sctp_event2skb(event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 notification = (union sctp_notification *) skb->data;
858 return notification->sn_header.sn_type;
859}
860
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200861/* RFC6458, Section 5.3.2. SCTP Header Information Structure
862 * (SCTP_SNDRCV, DEPRECATED)
863 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
865 struct msghdr *msghdr)
866{
867 struct sctp_sndrcvinfo sinfo;
868
869 if (sctp_ulpevent_is_notification(event))
870 return;
871
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200872 memset(&sinfo, 0, sizeof(sinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 sinfo.sinfo_stream = event->stream;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 sinfo.sinfo_ssn = event->ssn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 sinfo.sinfo_ppid = event->ppid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 sinfo.sinfo_flags = event->flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 sinfo.sinfo_tsn = event->tsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 sinfo.sinfo_cumtsn = event->cumtsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200880 /* Context value that is set via SCTP_CONTEXT socket option. */
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -0800881 sinfo.sinfo_context = event->asoc->default_rcv_context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 /* These fields are not used while receiving. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 sinfo.sinfo_timetolive = 0;
884
885 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200886 sizeof(sinfo), &sinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +0200889/* RFC6458, Section 5.3.5 SCTP Receive Information Structure
890 * (SCTP_SNDRCV)
891 */
892void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
893 struct msghdr *msghdr)
894{
895 struct sctp_rcvinfo rinfo;
896
897 if (sctp_ulpevent_is_notification(event))
898 return;
899
900 memset(&rinfo, 0, sizeof(struct sctp_rcvinfo));
901 rinfo.rcv_sid = event->stream;
902 rinfo.rcv_ssn = event->ssn;
903 rinfo.rcv_ppid = event->ppid;
904 rinfo.rcv_flags = event->flags;
905 rinfo.rcv_tsn = event->tsn;
906 rinfo.rcv_cumtsn = event->cumtsn;
907 rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc);
908 rinfo.rcv_context = event->asoc->default_rcv_context;
909
910 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO,
911 sizeof(rinfo), &rinfo);
912}
913
Geir Ola Vaagland2347c802014-07-12 20:30:38 +0200914/* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure
915 * (SCTP_NXTINFO)
916 */
917static void __sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
918 struct msghdr *msghdr,
919 const struct sk_buff *skb)
920{
921 struct sctp_nxtinfo nxtinfo;
922
923 memset(&nxtinfo, 0, sizeof(nxtinfo));
924 nxtinfo.nxt_sid = event->stream;
925 nxtinfo.nxt_ppid = event->ppid;
926 nxtinfo.nxt_flags = event->flags;
927 if (sctp_ulpevent_is_notification(event))
928 nxtinfo.nxt_flags |= SCTP_NOTIFICATION;
929 nxtinfo.nxt_length = skb->len;
930 nxtinfo.nxt_assoc_id = sctp_assoc2id(event->asoc);
931
932 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO,
933 sizeof(nxtinfo), &nxtinfo);
934}
935
936void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
937 struct msghdr *msghdr,
938 struct sock *sk)
939{
940 struct sk_buff *skb;
941 int err;
942
943 skb = sctp_skb_recv_datagram(sk, MSG_PEEK, 1, &err);
944 if (skb != NULL) {
945 __sctp_ulpevent_read_nxtinfo(sctp_skb2event(skb),
946 msghdr, skb);
947 /* Just release refcount here. */
948 kfree_skb(skb);
949 }
950}
951
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952/* Do accounting for bytes received and hold a reference to the association
953 * for each skb.
954 */
955static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
956 struct sctp_association *asoc)
957{
958 struct sk_buff *skb, *frag;
959
960 skb = sctp_event2skb(event);
961 /* Set the owner and charge rwnd for bytes received. */
962 sctp_ulpevent_set_owner(event, asoc);
Daniel Borkmann362d5202014-04-14 21:45:17 +0200963 sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
965 if (!skb->data_len)
966 return;
967
968 /* Note: Not clearing the entire event struct as this is just a
969 * fragment of the real event. However, we still need to do rwnd
970 * accounting.
971 * In general, the skb passed from IP can have only 1 level of
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900972 * fragments. But we allow multiple levels of fragments.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 */
David S. Miller1b003be2009-06-09 00:22:35 -0700974 skb_walk_frags(skb, frag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
978/* Do accounting for bytes just read by user and release the references to
979 * the association.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900980 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
982{
983 struct sk_buff *skb, *frag;
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -0700984 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
986 /* Current stack structures assume that the rcv buffer is
987 * per socket. For UDP style sockets this is not true as
988 * multiple associations may be on a single UDP-style socket.
989 * Use the local private area of the skb to track the owning
990 * association.
991 */
992
993 skb = sctp_event2skb(event);
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -0700994 len = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
996 if (!skb->data_len)
997 goto done;
998
999 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07001000 skb_walk_frags(skb, frag) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 /* NOTE: skb_shinfos are recursive. Although IP returns
1002 * skb's with only 1 level of fragments, SCTP reassembly can
1003 * increase the levels.
1004 */
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001005 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1006 }
1007
1008done:
Daniel Borkmann362d5202014-04-14 21:45:17 +02001009 sctp_assoc_rwnd_increase(event->asoc, len);
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001010 sctp_ulpevent_release_owner(event);
1011}
1012
1013static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
1014{
1015 struct sk_buff *skb, *frag;
1016
1017 skb = sctp_event2skb(event);
1018
1019 if (!skb->data_len)
1020 goto done;
1021
1022 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07001023 skb_walk_frags(skb, frag) {
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001024 /* NOTE: skb_shinfos are recursive. Although IP returns
1025 * skb's with only 1 level of fragments, SCTP reassembly can
1026 * increase the levels.
1027 */
1028 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 }
1030
1031done:
1032 sctp_ulpevent_release_owner(event);
1033}
1034
1035/* Free a ulpevent that has an owner. It includes releasing the reference
1036 * to the owner, updating the rwnd in case of a DATA event and freeing the
1037 * skb.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 */
1039void sctp_ulpevent_free(struct sctp_ulpevent *event)
1040{
1041 if (sctp_ulpevent_is_notification(event))
1042 sctp_ulpevent_release_owner(event);
1043 else
1044 sctp_ulpevent_release_data(event);
1045
1046 kfree_skb(sctp_event2skb(event));
1047}
1048
1049/* Purge the skb lists holding ulpevents. */
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001050unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051{
1052 struct sk_buff *skb;
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001053 unsigned int data_unread = 0;
1054
1055 while ((skb = skb_dequeue(list)) != NULL) {
1056 struct sctp_ulpevent *event = sctp_skb2event(skb);
1057
1058 if (!sctp_ulpevent_is_notification(event))
1059 data_unread += skb->len;
1060
1061 sctp_ulpevent_free(event);
1062 }
1063
1064 return data_unread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065}