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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,
Marcelo Ricardo Leitnerf5d258e2016-07-13 15:08:56 -030054 __u16 msg_flags,
Daniel Borkmanndda91922013-06-17 11:40:05 +020055 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. */
Marcelo Ricardo Leitnerf5d258e2016-07-13 15:08:56 -030063static struct sctp_ulpevent *sctp_ulpevent_new(int size, __u16 msg_flags,
Daniel Borkmanndda91922013-06-17 11:40:05 +020064 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{
Marcelo Ricardo Leitner52253db2016-07-23 00:33:44 -030094 struct sctp_chunk *chunk = event->chunk;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 struct sk_buff *skb;
96
97 /* Cast away the const, as we are just wanting to
98 * bump the reference count.
99 */
100 sctp_association_hold((struct sctp_association *)asoc);
101 skb = sctp_event2skb(event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 event->asoc = (struct sctp_association *)asoc;
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700103 atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
104 sctp_skb_set_owner_r(skb, asoc->base.sk);
Marcelo Ricardo Leitner52253db2016-07-23 00:33:44 -0300105 if (chunk && chunk->head_skb && !chunk->head_skb->sk)
106 chunk->head_skb->sk = asoc->base.sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
109/* A simple destructor to give up the reference to the association. */
110static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event)
111{
Neil Horman049b3ff2005-11-11 16:08:24 -0800112 struct sctp_association *asoc = event->asoc;
Neil Horman049b3ff2005-11-11 16:08:24 -0800113
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700114 atomic_sub(event->rmem_len, &asoc->rmem_alloc);
Neil Horman049b3ff2005-11-11 16:08:24 -0800115 sctp_association_put(asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
118/* Create and initialize an SCTP_ASSOC_CHANGE event.
119 *
120 * 5.3.1.1 SCTP_ASSOC_CHANGE
121 *
122 * Communication notifications inform the ULP that an SCTP association
123 * has either begun or ended. The identifier for a new association is
124 * provided by this notification.
125 *
126 * Note: There is no field checking here. If a field is unused it will be
127 * zero'd out.
128 */
129struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
130 const struct sctp_association *asoc,
131 __u16 flags, __u16 state, __u16 error, __u16 outbound,
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700132 __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
134 struct sctp_ulpevent *event;
135 struct sctp_assoc_change *sac;
136 struct sk_buff *skb;
137
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700138 /* If the lower layer passed in the chunk, it will be
139 * an ABORT, so we need to include it in the sac_info.
140 */
141 if (chunk) {
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700142 /* Copy the chunk data to a new skb and reserve enough
143 * head room to use as notification.
144 */
145 skb = skb_copy_expand(chunk->skb,
146 sizeof(struct sctp_assoc_change), 0, gfp);
147
148 if (!skb)
149 goto fail;
150
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700151 /* Embed the event fields inside the cloned skb. */
152 event = sctp_skb2event(skb);
153 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
154
155 /* Include the notification structure */
156 sac = (struct sctp_assoc_change *)
157 skb_push(skb, sizeof(struct sctp_assoc_change));
158
159 /* Trim the buffer to the right length. */
160 skb_trim(skb, sizeof(struct sctp_assoc_change) +
Vlad Yasevichac40e412007-05-09 13:52:35 -0700161 ntohs(chunk->chunk_hdr->length) -
162 sizeof(sctp_chunkhdr_t));
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700163 } else {
164 event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 MSG_NOTIFICATION, gfp);
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700166 if (!event)
167 goto fail;
168
169 skb = sctp_event2skb(event);
170 sac = (struct sctp_assoc_change *) skb_put(skb,
171 sizeof(struct sctp_assoc_change));
172 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 /* Socket Extensions for SCTP
175 * 5.3.1.1 SCTP_ASSOC_CHANGE
176 *
177 * sac_type:
178 * It should be SCTP_ASSOC_CHANGE.
179 */
180 sac->sac_type = SCTP_ASSOC_CHANGE;
181
182 /* Socket Extensions for SCTP
183 * 5.3.1.1 SCTP_ASSOC_CHANGE
184 *
185 * sac_state: 32 bits (signed integer)
186 * This field holds one of a number of values that communicate the
187 * event that happened to the association.
188 */
189 sac->sac_state = state;
190
191 /* Socket Extensions for SCTP
192 * 5.3.1.1 SCTP_ASSOC_CHANGE
193 *
194 * sac_flags: 16 bits (unsigned integer)
195 * Currently unused.
196 */
197 sac->sac_flags = 0;
198
199 /* Socket Extensions for SCTP
200 * 5.3.1.1 SCTP_ASSOC_CHANGE
201 *
202 * sac_length: sizeof (__u32)
203 * This field is the total length of the notification data, including
204 * the notification header.
205 */
Vlad Yasevichb90a1372008-02-14 10:18:20 -0500206 sac->sac_length = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 /* Socket Extensions for SCTP
209 * 5.3.1.1 SCTP_ASSOC_CHANGE
210 *
211 * sac_error: 32 bits (signed integer)
212 *
213 * If the state was reached due to a error condition (e.g.
214 * COMMUNICATION_LOST) any relevant error information is available in
215 * this field. This corresponds to the protocol error codes defined in
216 * [SCTP].
217 */
218 sac->sac_error = error;
219
220 /* Socket Extensions for SCTP
221 * 5.3.1.1 SCTP_ASSOC_CHANGE
222 *
223 * sac_outbound_streams: 16 bits (unsigned integer)
224 * sac_inbound_streams: 16 bits (unsigned integer)
225 *
226 * The maximum number of streams allowed in each direction are
227 * available in sac_outbound_streams and sac_inbound streams.
228 */
229 sac->sac_outbound_streams = outbound;
230 sac->sac_inbound_streams = inbound;
231
232 /* Socket Extensions for SCTP
233 * 5.3.1.1 SCTP_ASSOC_CHANGE
234 *
235 * sac_assoc_id: sizeof (sctp_assoc_t)
236 *
237 * The association id field, holds the identifier for the association.
238 * All notifications for a given association have the same association
239 * identifier. For TCP style socket, this field is ignored.
240 */
241 sctp_ulpevent_set_owner(event, asoc);
242 sac->sac_assoc_id = sctp_assoc2id(asoc);
243
244 return event;
245
246fail:
247 return NULL;
248}
249
250/* Create and initialize an SCTP_PEER_ADDR_CHANGE event.
251 *
252 * Socket Extensions for SCTP - draft-01
253 * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
254 *
255 * When a destination address on a multi-homed peer encounters a change
256 * an interface details event is sent.
257 */
258struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
259 const struct sctp_association *asoc,
260 const struct sockaddr_storage *aaddr,
Al Virodd0fc662005-10-07 07:46:04 +0100261 int flags, int state, int error, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
263 struct sctp_ulpevent *event;
264 struct sctp_paddr_change *spc;
265 struct sk_buff *skb;
266
267 event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change),
268 MSG_NOTIFICATION, gfp);
269 if (!event)
270 goto fail;
271
272 skb = sctp_event2skb(event);
273 spc = (struct sctp_paddr_change *)
274 skb_put(skb, sizeof(struct sctp_paddr_change));
275
276 /* Sockets API Extensions for SCTP
277 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
278 *
279 * spc_type:
280 *
281 * It should be SCTP_PEER_ADDR_CHANGE.
282 */
283 spc->spc_type = SCTP_PEER_ADDR_CHANGE;
284
285 /* Sockets API Extensions for SCTP
286 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
287 *
288 * spc_length: sizeof (__u32)
289 *
290 * This field is the total length of the notification data, including
291 * the notification header.
292 */
293 spc->spc_length = sizeof(struct sctp_paddr_change);
294
295 /* Sockets API Extensions for SCTP
296 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
297 *
298 * spc_flags: 16 bits (unsigned integer)
299 * Currently unused.
300 */
301 spc->spc_flags = 0;
302
303 /* Sockets API Extensions for SCTP
304 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
305 *
306 * spc_state: 32 bits (signed integer)
307 *
308 * This field holds one of a number of values that communicate the
309 * event that happened to the address.
310 */
311 spc->spc_state = state;
312
313 /* Sockets API Extensions for SCTP
314 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
315 *
316 * spc_error: 32 bits (signed integer)
317 *
318 * If the state was reached due to any error condition (e.g.
319 * ADDRESS_UNREACHABLE) any relevant error information is available in
320 * this field.
321 */
322 spc->spc_error = error;
323
324 /* Socket Extensions for SCTP
325 * 5.3.1.1 SCTP_ASSOC_CHANGE
326 *
327 * spc_assoc_id: sizeof (sctp_assoc_t)
328 *
329 * The association id field, holds the identifier for the association.
330 * All notifications for a given association have the same association
331 * identifier. For TCP style socket, this field is ignored.
332 */
333 sctp_ulpevent_set_owner(event, asoc);
334 spc->spc_assoc_id = sctp_assoc2id(asoc);
335
336 /* Sockets API Extensions for SCTP
337 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
338 *
339 * spc_aaddr: sizeof (struct sockaddr_storage)
340 *
341 * The affected address field, holds the remote peer's address that is
342 * encountering the change of state.
343 */
344 memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage));
345
346 /* Map ipv4 address into v4-mapped-on-v6 address. */
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600347 sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_to_user(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 sctp_sk(asoc->base.sk),
349 (union sctp_addr *)&spc->spc_aaddr);
350
351 return event;
352
353fail:
354 return NULL;
355}
356
357/* Create and initialize an SCTP_REMOTE_ERROR notification.
358 *
359 * Note: This assumes that the chunk->skb->data already points to the
360 * operation error payload.
361 *
362 * Socket Extensions for SCTP - draft-01
363 * 5.3.1.3 SCTP_REMOTE_ERROR
364 *
365 * A remote peer may send an Operational Error message to its peer.
366 * This message indicates a variety of error conditions on an
367 * association. The entire error TLV as it appears on the wire is
368 * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP
369 * specification [SCTP] and any extensions for a list of possible
370 * error formats.
371 */
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200372struct sctp_ulpevent *
373sctp_ulpevent_make_remote_error(const struct sctp_association *asoc,
374 struct sctp_chunk *chunk, __u16 flags,
375 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376{
377 struct sctp_ulpevent *event;
378 struct sctp_remote_error *sre;
379 struct sk_buff *skb;
380 sctp_errhdr_t *ch;
Al Viro9f81bcd2006-11-20 17:26:34 -0800381 __be16 cause;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 int elen;
383
384 ch = (sctp_errhdr_t *)(chunk->skb->data);
385 cause = ch->cause;
386 elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);
387
388 /* Pull off the ERROR header. */
389 skb_pull(chunk->skb, sizeof(sctp_errhdr_t));
390
391 /* Copy the skb to a new skb with room for us to prepend
392 * notification with.
393 */
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200394 skb = skb_copy_expand(chunk->skb, sizeof(*sre), 0, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396 /* Pull off the rest of the cause TLV from the chunk. */
397 skb_pull(chunk->skb, elen);
398 if (!skb)
399 goto fail;
400
401 /* Embed the event fields inside the cloned skb. */
402 event = sctp_skb2event(skb);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700403 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200405 sre = (struct sctp_remote_error *) skb_push(skb, sizeof(*sre));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 /* Trim the buffer to the right length. */
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200408 skb_trim(skb, sizeof(*sre) + elen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200410 /* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */
411 memset(sre, 0, sizeof(*sre));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 sre->sre_type = SCTP_REMOTE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 sre->sre_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 sre->sre_length = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 sre->sre_error = cause;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 sctp_ulpevent_set_owner(event, asoc);
417 sre->sre_assoc_id = sctp_assoc2id(asoc);
418
419 return event;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420fail:
421 return NULL;
422}
423
424/* Create and initialize a SCTP_SEND_FAILED notification.
425 *
426 * Socket Extensions for SCTP - draft-01
427 * 5.3.1.4 SCTP_SEND_FAILED
428 */
429struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
430 const struct sctp_association *asoc, struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100431 __u16 flags, __u32 error, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432{
433 struct sctp_ulpevent *event;
434 struct sctp_send_failed *ssf;
435 struct sk_buff *skb;
436
437 /* Pull off any padding. */
438 int len = ntohs(chunk->chunk_hdr->length);
439
440 /* Make skb with more room so we can prepend notification. */
441 skb = skb_copy_expand(chunk->skb,
442 sizeof(struct sctp_send_failed), /* headroom */
443 0, /* tailroom */
444 gfp);
445 if (!skb)
446 goto fail;
447
448 /* Pull off the common chunk header and DATA header. */
449 skb_pull(skb, sizeof(struct sctp_data_chunk));
450 len -= sizeof(struct sctp_data_chunk);
451
452 /* Embed the event fields inside the cloned skb. */
453 event = sctp_skb2event(skb);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700454 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456 ssf = (struct sctp_send_failed *)
457 skb_push(skb, sizeof(struct sctp_send_failed));
458
459 /* Socket Extensions for SCTP
460 * 5.3.1.4 SCTP_SEND_FAILED
461 *
462 * ssf_type:
463 * It should be SCTP_SEND_FAILED.
464 */
465 ssf->ssf_type = SCTP_SEND_FAILED;
466
467 /* Socket Extensions for SCTP
468 * 5.3.1.4 SCTP_SEND_FAILED
469 *
470 * ssf_flags: 16 bits (unsigned integer)
471 * The flag value will take one of the following values
472 *
473 * SCTP_DATA_UNSENT - Indicates that the data was never put on
474 * the wire.
475 *
476 * SCTP_DATA_SENT - Indicates that the data was put on the wire.
477 * Note that this does not necessarily mean that the
478 * data was (or was not) successfully delivered.
479 */
480 ssf->ssf_flags = flags;
481
482 /* Socket Extensions for SCTP
483 * 5.3.1.4 SCTP_SEND_FAILED
484 *
485 * ssf_length: sizeof (__u32)
486 * This field is the total length of the notification data, including
487 * the notification header.
488 */
489 ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
490 skb_trim(skb, ssf->ssf_length);
491
492 /* Socket Extensions for SCTP
493 * 5.3.1.4 SCTP_SEND_FAILED
494 *
495 * ssf_error: 16 bits (unsigned integer)
496 * This value represents the reason why the send failed, and if set,
497 * will be a SCTP protocol error code as defined in [SCTP] section
498 * 3.3.10.
499 */
500 ssf->ssf_error = error;
501
502 /* Socket Extensions for SCTP
503 * 5.3.1.4 SCTP_SEND_FAILED
504 *
505 * ssf_info: sizeof (struct sctp_sndrcvinfo)
506 * The original send information associated with the undelivered
507 * message.
508 */
509 memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));
510
511 /* Per TSVWG discussion with Randy. Allow the application to
Lucas De Marchie9c54992011-04-26 23:28:26 -0700512 * reassemble a fragmented message.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 */
514 ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;
515
516 /* Socket Extensions for SCTP
517 * 5.3.1.4 SCTP_SEND_FAILED
518 *
519 * ssf_assoc_id: sizeof (sctp_assoc_t)
520 * The association id field, sf_assoc_id, holds the identifier for the
521 * association. All notifications for a given association have the
522 * same association identifier. For TCP style socket, this field is
523 * ignored.
524 */
525 sctp_ulpevent_set_owner(event, asoc);
526 ssf->ssf_assoc_id = sctp_assoc2id(asoc);
527 return event;
528
529fail:
530 return NULL;
531}
532
533/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
534 *
535 * Socket Extensions for SCTP - draft-01
536 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
537 */
538struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
539 const struct sctp_association *asoc,
Al Virodd0fc662005-10-07 07:46:04 +0100540 __u16 flags, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
542 struct sctp_ulpevent *event;
543 struct sctp_shutdown_event *sse;
544 struct sk_buff *skb;
545
546 event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
547 MSG_NOTIFICATION, gfp);
548 if (!event)
549 goto fail;
550
551 skb = sctp_event2skb(event);
552 sse = (struct sctp_shutdown_event *)
553 skb_put(skb, sizeof(struct sctp_shutdown_event));
554
555 /* Socket Extensions for SCTP
556 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
557 *
558 * sse_type
559 * It should be SCTP_SHUTDOWN_EVENT
560 */
561 sse->sse_type = SCTP_SHUTDOWN_EVENT;
562
563 /* Socket Extensions for SCTP
564 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
565 *
566 * sse_flags: 16 bits (unsigned integer)
567 * Currently unused.
568 */
569 sse->sse_flags = 0;
570
571 /* Socket Extensions for SCTP
572 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
573 *
574 * sse_length: sizeof (__u32)
575 * This field is the total length of the notification data, including
576 * the notification header.
577 */
578 sse->sse_length = sizeof(struct sctp_shutdown_event);
579
580 /* Socket Extensions for SCTP
581 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
582 *
583 * sse_assoc_id: sizeof (sctp_assoc_t)
584 * The association id field, holds the identifier for the association.
585 * All notifications for a given association have the same association
586 * identifier. For TCP style socket, this field is ignored.
587 */
588 sctp_ulpevent_set_owner(event, asoc);
589 sse->sse_assoc_id = sctp_assoc2id(asoc);
590
591 return event;
592
593fail:
594 return NULL;
595}
596
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800597/* Create and initialize a SCTP_ADAPTATION_INDICATION notification.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 *
599 * Socket Extensions for SCTP
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800600 * 5.3.1.6 SCTP_ADAPTATION_INDICATION
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 */
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800602struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
Al Virodd0fc662005-10-07 07:46:04 +0100603 const struct sctp_association *asoc, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604{
605 struct sctp_ulpevent *event;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800606 struct sctp_adaptation_event *sai;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 struct sk_buff *skb;
608
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800609 event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 MSG_NOTIFICATION, gfp);
611 if (!event)
612 goto fail;
613
614 skb = sctp_event2skb(event);
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800615 sai = (struct sctp_adaptation_event *)
616 skb_put(skb, sizeof(struct sctp_adaptation_event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800618 sai->sai_type = SCTP_ADAPTATION_INDICATION;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 sai->sai_flags = 0;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -0800620 sai->sai_length = sizeof(struct sctp_adaptation_event);
621 sai->sai_adaptation_ind = asoc->peer.adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 sctp_ulpevent_set_owner(event, asoc);
623 sai->sai_assoc_id = sctp_assoc2id(asoc);
624
625 return event;
626
627fail:
628 return NULL;
629}
630
631/* A message has been received. Package this message as a notification
632 * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo
633 * even if filtered out later.
634 *
635 * Socket Extensions for SCTP
636 * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
637 */
638struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
639 struct sctp_chunk *chunk,
Al Virodd0fc662005-10-07 07:46:04 +0100640 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
642 struct sctp_ulpevent *event = NULL;
643 struct sk_buff *skb;
644 size_t padding, len;
Neil Horman4d93df02007-08-15 16:07:44 -0700645 int rx_count;
646
647 /*
648 * check to see if we need to make space for this
649 * new skb, expand the rcvbuffer if needed, or drop
650 * the frame
651 */
652 if (asoc->ep->rcvbuf_policy)
653 rx_count = atomic_read(&asoc->rmem_alloc);
654 else
655 rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc);
656
657 if (rx_count >= asoc->base.sk->sk_rcvbuf) {
658
659 if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
Mel Gormanc76562b2012-07-31 16:44:41 -0700660 (!sk_rmem_schedule(asoc->base.sk, chunk->skb,
661 chunk->skb->truesize)))
Neil Horman4d93df02007-08-15 16:07:44 -0700662 goto fail;
663 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
665 /* Clone the original skb, sharing the data. */
666 skb = skb_clone(chunk->skb, gfp);
667 if (!skb)
668 goto fail;
669
Vlad Yasevich3888e9e2008-07-08 02:28:39 -0700670 /* Now that all memory allocations for this chunk succeeded, we
671 * can mark it as received so the tsn_map is updated correctly.
672 */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700673 if (sctp_tsnmap_mark(&asoc->peer.tsn_map,
Neil Horman42448542012-06-30 03:04:26 +0000674 ntohl(chunk->subh.data_hdr->tsn),
675 chunk->transport))
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700676 goto fail_mark;
Vlad Yasevich3888e9e2008-07-08 02:28:39 -0700677
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 /* First calculate the padding, so we don't inadvertently
679 * pass up the wrong length to the user.
680 *
681 * RFC 2960 - Section 3.2 Chunk Field Descriptions
682 *
683 * The total length of a chunk(including Type, Length and Value fields)
684 * MUST be a multiple of 4 bytes. If the length of the chunk is not a
685 * multiple of 4 bytes, the sender MUST pad the chunk with all zero
686 * bytes and this padding is not included in the chunk length field.
687 * The sender should never pad with more than 3 bytes. The receiver
688 * MUST ignore the padding bytes.
689 */
690 len = ntohs(chunk->chunk_hdr->length);
691 padding = WORD_ROUND(len) - len;
692
693 /* Fixup cloned skb with just this chunks data. */
694 skb_trim(skb, chunk->chunk_end - padding - skb->data);
695
696 /* Embed the event fields inside the cloned skb. */
697 event = sctp_skb2event(skb);
698
Vlad Yasevich331c4ee2006-10-09 21:34:04 -0700699 /* Initialize event with flags 0 and correct length
700 * Since this is a clone of the original skb, only account for
701 * the data of this chunk as other chunks will be accounted separately.
702 */
703 sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -0300705 /* And hold the chunk as we need it for getting the IP headers
706 * later in recvmsg
707 */
708 sctp_chunk_hold(chunk);
709 event->chunk = chunk;
710
Xin Long1fe323a2016-08-07 14:15:13 +0800711 sctp_ulpevent_receive_data(event, asoc);
712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 event->stream = ntohs(chunk->subh.data_hdr->stream);
714 event->ssn = ntohs(chunk->subh.data_hdr->ssn);
715 event->ppid = chunk->subh.data_hdr->ppid;
716 if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -0700717 event->flags |= SCTP_UNORDERED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
719 }
720 event->tsn = ntohl(chunk->subh.data_hdr->tsn);
721 event->msg_flags |= chunk->chunk_hdr->flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 return event;
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700724
725fail_mark:
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -0300726 sctp_chunk_put(chunk);
Vlad Yasevich8e1ee182008-10-08 14:18:39 -0700727 kfree_skb(skb);
728fail:
729 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730}
731
732/* Create a partial delivery related event.
733 *
734 * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
735 *
736 * When a receiver is engaged in a partial delivery of a
737 * message this notification will be used to indicate
738 * various events.
739 */
740struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700741 const struct sctp_association *asoc, __u32 indication,
Al Virodd0fc662005-10-07 07:46:04 +0100742 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
744 struct sctp_ulpevent *event;
745 struct sctp_pdapi_event *pd;
746 struct sk_buff *skb;
747
748 event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
749 MSG_NOTIFICATION, gfp);
750 if (!event)
751 goto fail;
752
753 skb = sctp_event2skb(event);
754 pd = (struct sctp_pdapi_event *)
755 skb_put(skb, sizeof(struct sctp_pdapi_event));
756
757 /* pdapi_type
758 * It should be SCTP_PARTIAL_DELIVERY_EVENT
759 *
760 * pdapi_flags: 16 bits (unsigned integer)
761 * Currently unused.
762 */
763 pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
764 pd->pdapi_flags = 0;
765
766 /* pdapi_length: 32 bits (unsigned integer)
767 *
768 * This field is the total length of the notification data, including
769 * the notification header. It will generally be sizeof (struct
770 * sctp_pdapi_event).
771 */
772 pd->pdapi_length = sizeof(struct sctp_pdapi_event);
773
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900774 /* pdapi_indication: 32 bits (unsigned integer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 *
776 * This field holds the indication being sent to the application.
777 */
778 pd->pdapi_indication = indication;
779
780 /* pdapi_assoc_id: sizeof (sctp_assoc_t)
781 *
782 * The association id field, holds the identifier for the association.
783 */
784 sctp_ulpevent_set_owner(event, asoc);
785 pd->pdapi_assoc_id = sctp_assoc2id(asoc);
786
787 return event;
788fail:
789 return NULL;
790}
791
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700792struct sctp_ulpevent *sctp_ulpevent_make_authkey(
793 const struct sctp_association *asoc, __u16 key_id,
794 __u32 indication, gfp_t gfp)
795{
796 struct sctp_ulpevent *event;
797 struct sctp_authkey_event *ak;
798 struct sk_buff *skb;
799
800 event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
801 MSG_NOTIFICATION, gfp);
802 if (!event)
803 goto fail;
804
805 skb = sctp_event2skb(event);
806 ak = (struct sctp_authkey_event *)
807 skb_put(skb, sizeof(struct sctp_authkey_event));
808
Wei Yongjunee916fd2011-04-17 17:28:01 +0000809 ak->auth_type = SCTP_AUTHENTICATION_EVENT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700810 ak->auth_flags = 0;
811 ak->auth_length = sizeof(struct sctp_authkey_event);
812
813 ak->auth_keynumber = key_id;
814 ak->auth_altkeynumber = 0;
815 ak->auth_indication = indication;
816
817 /*
818 * The association id field, holds the identifier for the association.
819 */
820 sctp_ulpevent_set_owner(event, asoc);
821 ak->auth_assoc_id = sctp_assoc2id(asoc);
822
823 return event;
824fail:
825 return NULL;
826}
827
Wei Yongjune1cdd552011-04-17 17:29:03 +0000828/*
829 * Socket Extensions for SCTP
830 * 6.3.10. SCTP_SENDER_DRY_EVENT
831 */
832struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
833 const struct sctp_association *asoc, gfp_t gfp)
834{
835 struct sctp_ulpevent *event;
836 struct sctp_sender_dry_event *sdry;
837 struct sk_buff *skb;
838
839 event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
840 MSG_NOTIFICATION, gfp);
841 if (!event)
842 return NULL;
843
844 skb = sctp_event2skb(event);
845 sdry = (struct sctp_sender_dry_event *)
846 skb_put(skb, sizeof(struct sctp_sender_dry_event));
847
848 sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
849 sdry->sender_dry_flags = 0;
850 sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
851 sctp_ulpevent_set_owner(event, asoc);
852 sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
853
854 return event;
855}
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700856
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857/* Return the notification type, assuming this is a notification
858 * event.
859 */
860__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
861{
862 union sctp_notification *notification;
863 struct sk_buff *skb;
864
Vlad Yasevichab38fb02008-04-12 18:40:06 -0700865 skb = sctp_event2skb(event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 notification = (union sctp_notification *) skb->data;
867 return notification->sn_header.sn_type;
868}
869
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200870/* RFC6458, Section 5.3.2. SCTP Header Information Structure
871 * (SCTP_SNDRCV, DEPRECATED)
872 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
874 struct msghdr *msghdr)
875{
876 struct sctp_sndrcvinfo sinfo;
877
878 if (sctp_ulpevent_is_notification(event))
879 return;
880
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200881 memset(&sinfo, 0, sizeof(sinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 sinfo.sinfo_stream = event->stream;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 sinfo.sinfo_ssn = event->ssn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 sinfo.sinfo_ppid = event->ppid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 sinfo.sinfo_flags = event->flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 sinfo.sinfo_tsn = event->tsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 sinfo.sinfo_cumtsn = event->cumtsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200889 /* Context value that is set via SCTP_CONTEXT socket option. */
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -0800890 sinfo.sinfo_context = event->asoc->default_rcv_context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 /* These fields are not used while receiving. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 sinfo.sinfo_timetolive = 0;
893
894 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
Daniel Borkmann8f2e5ae2014-07-12 20:30:35 +0200895 sizeof(sinfo), &sinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896}
897
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +0200898/* RFC6458, Section 5.3.5 SCTP Receive Information Structure
899 * (SCTP_SNDRCV)
900 */
901void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
902 struct msghdr *msghdr)
903{
904 struct sctp_rcvinfo rinfo;
905
906 if (sctp_ulpevent_is_notification(event))
907 return;
908
909 memset(&rinfo, 0, sizeof(struct sctp_rcvinfo));
910 rinfo.rcv_sid = event->stream;
911 rinfo.rcv_ssn = event->ssn;
912 rinfo.rcv_ppid = event->ppid;
913 rinfo.rcv_flags = event->flags;
914 rinfo.rcv_tsn = event->tsn;
915 rinfo.rcv_cumtsn = event->cumtsn;
916 rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc);
917 rinfo.rcv_context = event->asoc->default_rcv_context;
918
919 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO,
920 sizeof(rinfo), &rinfo);
921}
922
Geir Ola Vaagland2347c802014-07-12 20:30:38 +0200923/* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure
924 * (SCTP_NXTINFO)
925 */
926static void __sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
927 struct msghdr *msghdr,
928 const struct sk_buff *skb)
929{
930 struct sctp_nxtinfo nxtinfo;
931
932 memset(&nxtinfo, 0, sizeof(nxtinfo));
933 nxtinfo.nxt_sid = event->stream;
934 nxtinfo.nxt_ppid = event->ppid;
935 nxtinfo.nxt_flags = event->flags;
936 if (sctp_ulpevent_is_notification(event))
937 nxtinfo.nxt_flags |= SCTP_NOTIFICATION;
938 nxtinfo.nxt_length = skb->len;
939 nxtinfo.nxt_assoc_id = sctp_assoc2id(event->asoc);
940
941 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO,
942 sizeof(nxtinfo), &nxtinfo);
943}
944
945void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
946 struct msghdr *msghdr,
947 struct sock *sk)
948{
949 struct sk_buff *skb;
950 int err;
951
952 skb = sctp_skb_recv_datagram(sk, MSG_PEEK, 1, &err);
953 if (skb != NULL) {
954 __sctp_ulpevent_read_nxtinfo(sctp_skb2event(skb),
955 msghdr, skb);
956 /* Just release refcount here. */
957 kfree_skb(skb);
958 }
959}
960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961/* Do accounting for bytes received and hold a reference to the association
962 * for each skb.
963 */
964static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
965 struct sctp_association *asoc)
966{
967 struct sk_buff *skb, *frag;
968
969 skb = sctp_event2skb(event);
970 /* Set the owner and charge rwnd for bytes received. */
971 sctp_ulpevent_set_owner(event, asoc);
Daniel Borkmann362d5202014-04-14 21:45:17 +0200972 sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
974 if (!skb->data_len)
975 return;
976
977 /* Note: Not clearing the entire event struct as this is just a
978 * fragment of the real event. However, we still need to do rwnd
979 * accounting.
980 * In general, the skb passed from IP can have only 1 level of
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900981 * fragments. But we allow multiple levels of fragments.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 */
David S. Miller1b003be2009-06-09 00:22:35 -0700983 skb_walk_frags(skb, frag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985}
986
987/* Do accounting for bytes just read by user and release the references to
988 * the association.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900989 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
991{
992 struct sk_buff *skb, *frag;
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -0700993 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
995 /* Current stack structures assume that the rcv buffer is
996 * per socket. For UDP style sockets this is not true as
997 * multiple associations may be on a single UDP-style socket.
998 * Use the local private area of the skb to track the owning
999 * association.
1000 */
1001
1002 skb = sctp_event2skb(event);
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001003 len = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
1005 if (!skb->data_len)
1006 goto done;
1007
1008 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07001009 skb_walk_frags(skb, frag) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 /* NOTE: skb_shinfos are recursive. Although IP returns
1011 * skb's with only 1 level of fragments, SCTP reassembly can
1012 * increase the levels.
1013 */
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001014 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1015 }
1016
1017done:
Daniel Borkmann362d5202014-04-14 21:45:17 +02001018 sctp_assoc_rwnd_increase(event->asoc, len);
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -03001019 sctp_chunk_put(event->chunk);
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001020 sctp_ulpevent_release_owner(event);
1021}
1022
1023static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
1024{
1025 struct sk_buff *skb, *frag;
1026
1027 skb = sctp_event2skb(event);
1028
1029 if (!skb->data_len)
1030 goto done;
1031
1032 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07001033 skb_walk_frags(skb, frag) {
Tsutomu Fujiid7c2c9e2006-06-17 22:58:28 -07001034 /* NOTE: skb_shinfos are recursive. Although IP returns
1035 * skb's with only 1 level of fragments, SCTP reassembly can
1036 * increase the levels.
1037 */
1038 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 }
1040
1041done:
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -03001042 sctp_chunk_put(event->chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 sctp_ulpevent_release_owner(event);
1044}
1045
1046/* Free a ulpevent that has an owner. It includes releasing the reference
1047 * to the owner, updating the rwnd in case of a DATA event and freeing the
1048 * skb.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 */
1050void sctp_ulpevent_free(struct sctp_ulpevent *event)
1051{
1052 if (sctp_ulpevent_is_notification(event))
1053 sctp_ulpevent_release_owner(event);
1054 else
1055 sctp_ulpevent_release_data(event);
1056
1057 kfree_skb(sctp_event2skb(event));
1058}
1059
1060/* Purge the skb lists holding ulpevents. */
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001061unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062{
1063 struct sk_buff *skb;
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001064 unsigned int data_unread = 0;
1065
1066 while ((skb = skb_dequeue(list)) != NULL) {
1067 struct sctp_ulpevent *event = sctp_skb2event(skb);
1068
1069 if (!sctp_ulpevent_is_notification(event))
1070 data_unread += skb->len;
1071
1072 sctp_ulpevent_free(event);
1073 }
1074
1075 return data_unread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076}