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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001 Intel Corp. | |
6 | * 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). | |
60c778b2 VY |
11 | * |
12 | * This SCTP implementation is free software; | |
1da177e4 LT |
13 | * 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 | * | |
60c778b2 | 18 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
19 | * 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 | |
4b2f13a2 JK |
25 | * along with GNU CC; see the file COPYING. If not, see |
26 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
27 | * |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
91705c61 | 30 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 31 | * |
1da177e4 LT |
32 | * 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> | |
1da177e4 LT |
37 | */ |
38 | ||
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | #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 | ||
46 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
47 | struct sctp_association *asoc); | |
48 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event); | |
d7c2c9e3 TF |
49 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event); |
50 | ||
1da177e4 | 51 | |
1da177e4 | 52 | /* Initialize an ULP event from an given skb. */ |
dda91928 DB |
53 | static void sctp_ulpevent_init(struct sctp_ulpevent *event, |
54 | int msg_flags, | |
55 | unsigned int len) | |
1da177e4 LT |
56 | { |
57 | memset(event, 0, sizeof(struct sctp_ulpevent)); | |
58 | event->msg_flags = msg_flags; | |
331c4ee7 | 59 | event->rmem_len = len; |
1da177e4 LT |
60 | } |
61 | ||
62 | /* Create a new sctp_ulpevent. */ | |
dda91928 DB |
63 | static struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags, |
64 | gfp_t gfp) | |
1da177e4 LT |
65 | { |
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); | |
331c4ee7 | 74 | sctp_ulpevent_init(event, msg_flags, skb->truesize); |
1da177e4 LT |
75 | |
76 | return event; | |
77 | ||
78 | fail: | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | /* Is this a MSG_NOTIFICATION? */ | |
83 | int 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 | */ | |
91 | static 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); | |
1da177e4 | 101 | event->asoc = (struct sctp_association *)asoc; |
331c4ee7 VY |
102 | atomic_add(event->rmem_len, &event->asoc->rmem_alloc); |
103 | sctp_skb_set_owner_r(skb, asoc->base.sk); | |
1da177e4 LT |
104 | } |
105 | ||
106 | /* A simple destructor to give up the reference to the association. */ | |
107 | static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) | |
108 | { | |
049b3ff5 | 109 | struct sctp_association *asoc = event->asoc; |
049b3ff5 | 110 | |
331c4ee7 | 111 | atomic_sub(event->rmem_len, &asoc->rmem_alloc); |
049b3ff5 | 112 | sctp_association_put(asoc); |
1da177e4 LT |
113 | } |
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 | */ | |
126 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( | |
127 | const struct sctp_association *asoc, | |
128 | __u16 flags, __u16 state, __u16 error, __u16 outbound, | |
a5a35e76 | 129 | __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp) |
1da177e4 LT |
130 | { |
131 | struct sctp_ulpevent *event; | |
132 | struct sctp_assoc_change *sac; | |
133 | struct sk_buff *skb; | |
134 | ||
a5a35e76 VY |
135 | /* 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) { | |
a5a35e76 VY |
139 | /* 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 | ||
a5a35e76 VY |
148 | /* 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) + | |
ac40e41f VY |
158 | ntohs(chunk->chunk_hdr->length) - |
159 | sizeof(sctp_chunkhdr_t)); | |
a5a35e76 VY |
160 | } else { |
161 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change), | |
1da177e4 | 162 | MSG_NOTIFICATION, gfp); |
a5a35e76 VY |
163 | 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 | } | |
1da177e4 LT |
170 | |
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 | */ | |
b90a137d | 203 | sac->sac_length = skb->len; |
1da177e4 LT |
204 | |
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 | ||
243 | fail: | |
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 | */ | |
255 | struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change( | |
256 | const struct sctp_association *asoc, | |
257 | const struct sockaddr_storage *aaddr, | |
dd0fc66f | 258 | int flags, int state, int error, gfp_t gfp) |
1da177e4 LT |
259 | { |
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. */ | |
299ee123 | 344 | sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_to_user( |
1da177e4 LT |
345 | sctp_sk(asoc->base.sk), |
346 | (union sctp_addr *)&spc->spc_aaddr); | |
347 | ||
348 | return event; | |
349 | ||
350 | fail: | |
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 | */ | |
8f2e5ae4 DB |
369 | struct sctp_ulpevent * |
370 | sctp_ulpevent_make_remote_error(const struct sctp_association *asoc, | |
371 | struct sctp_chunk *chunk, __u16 flags, | |
372 | gfp_t gfp) | |
1da177e4 LT |
373 | { |
374 | struct sctp_ulpevent *event; | |
375 | struct sctp_remote_error *sre; | |
376 | struct sk_buff *skb; | |
377 | sctp_errhdr_t *ch; | |
9f81bcd9 | 378 | __be16 cause; |
1da177e4 LT |
379 | 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 | */ | |
8f2e5ae4 | 391 | skb = skb_copy_expand(chunk->skb, sizeof(*sre), 0, gfp); |
1da177e4 LT |
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); | |
331c4ee7 | 400 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 | 401 | |
8f2e5ae4 | 402 | sre = (struct sctp_remote_error *) skb_push(skb, sizeof(*sre)); |
1da177e4 LT |
403 | |
404 | /* Trim the buffer to the right length. */ | |
8f2e5ae4 | 405 | skb_trim(skb, sizeof(*sre) + elen); |
1da177e4 | 406 | |
8f2e5ae4 DB |
407 | /* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */ |
408 | memset(sre, 0, sizeof(*sre)); | |
1da177e4 | 409 | sre->sre_type = SCTP_REMOTE_ERROR; |
1da177e4 | 410 | sre->sre_flags = 0; |
1da177e4 | 411 | sre->sre_length = skb->len; |
1da177e4 | 412 | sre->sre_error = cause; |
1da177e4 LT |
413 | sctp_ulpevent_set_owner(event, asoc); |
414 | sre->sre_assoc_id = sctp_assoc2id(asoc); | |
415 | ||
416 | return event; | |
1da177e4 LT |
417 | fail: |
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 | */ | |
426 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( | |
427 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 428 | __u16 flags, __u32 error, gfp_t gfp) |
1da177e4 LT |
429 | { |
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); | |
331c4ee7 | 451 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 LT |
452 | |
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 | |
e9c54999 | 509 | * reassemble a fragmented message. |
1da177e4 LT |
510 | */ |
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 | ||
526 | fail: | |
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 | */ | |
535 | struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( | |
536 | const struct sctp_association *asoc, | |
dd0fc66f | 537 | __u16 flags, gfp_t gfp) |
1da177e4 LT |
538 | { |
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 | ||
590 | fail: | |
591 | return NULL; | |
592 | } | |
593 | ||
0f3fffd8 | 594 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
1da177e4 LT |
595 | * |
596 | * Socket Extensions for SCTP | |
0f3fffd8 | 597 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
1da177e4 | 598 | */ |
0f3fffd8 | 599 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
dd0fc66f | 600 | const struct sctp_association *asoc, gfp_t gfp) |
1da177e4 LT |
601 | { |
602 | struct sctp_ulpevent *event; | |
0f3fffd8 | 603 | struct sctp_adaptation_event *sai; |
1da177e4 LT |
604 | struct sk_buff *skb; |
605 | ||
0f3fffd8 | 606 | event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event), |
1da177e4 LT |
607 | MSG_NOTIFICATION, gfp); |
608 | if (!event) | |
609 | goto fail; | |
610 | ||
611 | skb = sctp_event2skb(event); | |
0f3fffd8 ISJ |
612 | sai = (struct sctp_adaptation_event *) |
613 | skb_put(skb, sizeof(struct sctp_adaptation_event)); | |
1da177e4 | 614 | |
0f3fffd8 | 615 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
1da177e4 | 616 | sai->sai_flags = 0; |
0f3fffd8 ISJ |
617 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
618 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
619 | sctp_ulpevent_set_owner(event, asoc); |
620 | sai->sai_assoc_id = sctp_assoc2id(asoc); | |
621 | ||
622 | return event; | |
623 | ||
624 | fail: | |
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 | */ | |
635 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, | |
636 | struct sctp_chunk *chunk, | |
dd0fc66f | 637 | gfp_t gfp) |
1da177e4 LT |
638 | { |
639 | struct sctp_ulpevent *event = NULL; | |
640 | struct sk_buff *skb; | |
641 | size_t padding, len; | |
4d93df0a NH |
642 | 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) || | |
c76562b6 MG |
657 | (!sk_rmem_schedule(asoc->base.sk, chunk->skb, |
658 | chunk->skb->truesize))) | |
4d93df0a NH |
659 | goto fail; |
660 | } | |
1da177e4 LT |
661 | |
662 | /* Clone the original skb, sharing the data. */ | |
663 | skb = skb_clone(chunk->skb, gfp); | |
664 | if (!skb) | |
665 | goto fail; | |
666 | ||
3888e9ef VY |
667 | /* Now that all memory allocations for this chunk succeeded, we |
668 | * can mark it as received so the tsn_map is updated correctly. | |
669 | */ | |
8e1ee18c | 670 | if (sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d NH |
671 | ntohl(chunk->subh.data_hdr->tsn), |
672 | chunk->transport)) | |
8e1ee18c | 673 | goto fail_mark; |
3888e9ef | 674 | |
1da177e4 LT |
675 | /* 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 | ||
331c4ee7 VY |
696 | /* 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)); | |
1da177e4 LT |
701 | |
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) { | |
eaa5c54d | 708 | event->flags |= SCTP_UNORDERED; |
1da177e4 LT |
709 | 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 | ||
1da177e4 | 715 | return event; |
8e1ee18c VY |
716 | |
717 | fail_mark: | |
718 | kfree_skb(skb); | |
719 | fail: | |
720 | return NULL; | |
1da177e4 LT |
721 | } |
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 | */ | |
731 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( | |
3182cd84 | 732 | const struct sctp_association *asoc, __u32 indication, |
dd0fc66f | 733 | gfp_t gfp) |
1da177e4 LT |
734 | { |
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 | ||
d808ad9a | 765 | /* pdapi_indication: 32 bits (unsigned integer) |
1da177e4 LT |
766 | * |
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; | |
779 | fail: | |
780 | return NULL; | |
781 | } | |
782 | ||
65b07e5d VY |
783 | struct 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 | ||
ee916fd0 | 800 | ak->auth_type = SCTP_AUTHENTICATION_EVENT; |
65b07e5d VY |
801 | 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; | |
815 | fail: | |
816 | return NULL; | |
817 | } | |
818 | ||
e1cdd553 WY |
819 | /* |
820 | * Socket Extensions for SCTP | |
821 | * 6.3.10. SCTP_SENDER_DRY_EVENT | |
822 | */ | |
823 | struct 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 | } | |
65b07e5d | 847 | |
1da177e4 LT |
848 | /* 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 | ||
ab38fb04 | 856 | skb = sctp_event2skb(event); |
1da177e4 LT |
857 | notification = (union sctp_notification *) skb->data; |
858 | return notification->sn_header.sn_type; | |
859 | } | |
860 | ||
8f2e5ae4 DB |
861 | /* RFC6458, Section 5.3.2. SCTP Header Information Structure |
862 | * (SCTP_SNDRCV, DEPRECATED) | |
863 | */ | |
1da177e4 LT |
864 | void 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 | ||
8f2e5ae4 | 872 | memset(&sinfo, 0, sizeof(sinfo)); |
1da177e4 | 873 | sinfo.sinfo_stream = event->stream; |
1da177e4 | 874 | sinfo.sinfo_ssn = event->ssn; |
1da177e4 | 875 | sinfo.sinfo_ppid = event->ppid; |
1da177e4 | 876 | sinfo.sinfo_flags = event->flags; |
1da177e4 | 877 | sinfo.sinfo_tsn = event->tsn; |
1da177e4 | 878 | sinfo.sinfo_cumtsn = event->cumtsn; |
1da177e4 | 879 | sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); |
8f2e5ae4 | 880 | /* Context value that is set via SCTP_CONTEXT socket option. */ |
6ab792f5 | 881 | sinfo.sinfo_context = event->asoc->default_rcv_context; |
1da177e4 | 882 | /* These fields are not used while receiving. */ |
1da177e4 LT |
883 | sinfo.sinfo_timetolive = 0; |
884 | ||
885 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, | |
8f2e5ae4 | 886 | sizeof(sinfo), &sinfo); |
1da177e4 LT |
887 | } |
888 | ||
0d3a421d GOV |
889 | /* RFC6458, Section 5.3.5 SCTP Receive Information Structure |
890 | * (SCTP_SNDRCV) | |
891 | */ | |
892 | void 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 | ||
2347c80f GOV |
914 | /* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure |
915 | * (SCTP_NXTINFO) | |
916 | */ | |
917 | static 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 | ||
936 | void 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 | ||
1da177e4 LT |
952 | /* Do accounting for bytes received and hold a reference to the association |
953 | * for each skb. | |
954 | */ | |
955 | static 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); | |
362d5204 | 963 | sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); |
1da177e4 LT |
964 | |
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 | |
d808ad9a | 972 | * fragments. But we allow multiple levels of fragments. |
1da177e4 | 973 | */ |
1b003be3 | 974 | skb_walk_frags(skb, frag) |
1da177e4 | 975 | sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); |
1da177e4 LT |
976 | } |
977 | ||
978 | /* Do accounting for bytes just read by user and release the references to | |
979 | * the association. | |
d808ad9a | 980 | */ |
1da177e4 LT |
981 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
982 | { | |
983 | struct sk_buff *skb, *frag; | |
d7c2c9e3 | 984 | unsigned int len; |
1da177e4 LT |
985 | |
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); | |
d7c2c9e3 TF |
994 | len = skb->len; |
995 | ||
996 | if (!skb->data_len) | |
997 | goto done; | |
998 | ||
999 | /* Don't forget the fragments. */ | |
1b003be3 | 1000 | skb_walk_frags(skb, frag) { |
d7c2c9e3 TF |
1001 | /* 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 | */ | |
1005 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); | |
1006 | } | |
1007 | ||
1008 | done: | |
362d5204 | 1009 | sctp_assoc_rwnd_increase(event->asoc, len); |
d7c2c9e3 TF |
1010 | sctp_ulpevent_release_owner(event); |
1011 | } | |
1012 | ||
1013 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) | |
1014 | { | |
1015 | struct sk_buff *skb, *frag; | |
1016 | ||
1017 | skb = sctp_event2skb(event); | |
1da177e4 LT |
1018 | |
1019 | if (!skb->data_len) | |
1020 | goto done; | |
1021 | ||
1022 | /* Don't forget the fragments. */ | |
1b003be3 | 1023 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
1024 | /* 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 | */ | |
d7c2c9e3 | 1028 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
1da177e4 LT |
1029 | } |
1030 | ||
1031 | done: | |
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. | |
1da177e4 LT |
1038 | */ |
1039 | void 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. */ | |
cd4fcc70 | 1050 | unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
1da177e4 LT |
1051 | { |
1052 | struct sk_buff *skb; | |
cd4fcc70 TG |
1053 | 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; | |
1da177e4 | 1065 | } |