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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. */ | |
344 | sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map( | |
345 | sctp_sk(asoc->base.sk), | |
346 | (union sctp_addr *)&spc->spc_aaddr); | |
347 | ||
348 | return event; | |
349 | ||
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 | */ | |
369 | struct sctp_ulpevent *sctp_ulpevent_make_remote_error( | |
370 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 371 | __u16 flags, gfp_t gfp) |
1da177e4 LT |
372 | { |
373 | struct sctp_ulpevent *event; | |
374 | struct sctp_remote_error *sre; | |
375 | struct sk_buff *skb; | |
376 | sctp_errhdr_t *ch; | |
9f81bcd9 | 377 | __be16 cause; |
1da177e4 LT |
378 | int elen; |
379 | ||
380 | ch = (sctp_errhdr_t *)(chunk->skb->data); | |
381 | cause = ch->cause; | |
382 | elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t); | |
383 | ||
384 | /* Pull off the ERROR header. */ | |
385 | skb_pull(chunk->skb, sizeof(sctp_errhdr_t)); | |
386 | ||
387 | /* Copy the skb to a new skb with room for us to prepend | |
388 | * notification with. | |
389 | */ | |
390 | skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error), | |
391 | 0, gfp); | |
392 | ||
393 | /* Pull off the rest of the cause TLV from the chunk. */ | |
394 | skb_pull(chunk->skb, elen); | |
395 | if (!skb) | |
396 | goto fail; | |
397 | ||
398 | /* Embed the event fields inside the cloned skb. */ | |
399 | event = sctp_skb2event(skb); | |
331c4ee7 | 400 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 LT |
401 | |
402 | sre = (struct sctp_remote_error *) | |
403 | skb_push(skb, sizeof(struct sctp_remote_error)); | |
404 | ||
405 | /* Trim the buffer to the right length. */ | |
406 | skb_trim(skb, sizeof(struct sctp_remote_error) + elen); | |
407 | ||
408 | /* Socket Extensions for SCTP | |
409 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
410 | * | |
411 | * sre_type: | |
412 | * It should be SCTP_REMOTE_ERROR. | |
413 | */ | |
414 | sre->sre_type = SCTP_REMOTE_ERROR; | |
415 | ||
416 | /* | |
417 | * Socket Extensions for SCTP | |
418 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
419 | * | |
420 | * sre_flags: 16 bits (unsigned integer) | |
421 | * Currently unused. | |
422 | */ | |
423 | sre->sre_flags = 0; | |
424 | ||
425 | /* Socket Extensions for SCTP | |
426 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
427 | * | |
428 | * sre_length: sizeof (__u32) | |
429 | * | |
430 | * This field is the total length of the notification data, | |
431 | * including the notification header. | |
432 | */ | |
433 | sre->sre_length = skb->len; | |
434 | ||
435 | /* Socket Extensions for SCTP | |
436 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
437 | * | |
438 | * sre_error: 16 bits (unsigned integer) | |
439 | * This value represents one of the Operational Error causes defined in | |
440 | * the SCTP specification, in network byte order. | |
441 | */ | |
442 | sre->sre_error = cause; | |
443 | ||
444 | /* Socket Extensions for SCTP | |
445 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
446 | * | |
447 | * sre_assoc_id: sizeof (sctp_assoc_t) | |
448 | * | |
449 | * The association id field, holds the identifier for the association. | |
450 | * All notifications for a given association have the same association | |
451 | * identifier. For TCP style socket, this field is ignored. | |
452 | */ | |
453 | sctp_ulpevent_set_owner(event, asoc); | |
454 | sre->sre_assoc_id = sctp_assoc2id(asoc); | |
455 | ||
456 | return event; | |
457 | ||
458 | fail: | |
459 | return NULL; | |
460 | } | |
461 | ||
462 | /* Create and initialize a SCTP_SEND_FAILED notification. | |
463 | * | |
464 | * Socket Extensions for SCTP - draft-01 | |
465 | * 5.3.1.4 SCTP_SEND_FAILED | |
466 | */ | |
467 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( | |
468 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 469 | __u16 flags, __u32 error, gfp_t gfp) |
1da177e4 LT |
470 | { |
471 | struct sctp_ulpevent *event; | |
472 | struct sctp_send_failed *ssf; | |
473 | struct sk_buff *skb; | |
474 | ||
475 | /* Pull off any padding. */ | |
476 | int len = ntohs(chunk->chunk_hdr->length); | |
477 | ||
478 | /* Make skb with more room so we can prepend notification. */ | |
479 | skb = skb_copy_expand(chunk->skb, | |
480 | sizeof(struct sctp_send_failed), /* headroom */ | |
481 | 0, /* tailroom */ | |
482 | gfp); | |
483 | if (!skb) | |
484 | goto fail; | |
485 | ||
486 | /* Pull off the common chunk header and DATA header. */ | |
487 | skb_pull(skb, sizeof(struct sctp_data_chunk)); | |
488 | len -= sizeof(struct sctp_data_chunk); | |
489 | ||
490 | /* Embed the event fields inside the cloned skb. */ | |
491 | event = sctp_skb2event(skb); | |
331c4ee7 | 492 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 LT |
493 | |
494 | ssf = (struct sctp_send_failed *) | |
495 | skb_push(skb, sizeof(struct sctp_send_failed)); | |
496 | ||
497 | /* Socket Extensions for SCTP | |
498 | * 5.3.1.4 SCTP_SEND_FAILED | |
499 | * | |
500 | * ssf_type: | |
501 | * It should be SCTP_SEND_FAILED. | |
502 | */ | |
503 | ssf->ssf_type = SCTP_SEND_FAILED; | |
504 | ||
505 | /* Socket Extensions for SCTP | |
506 | * 5.3.1.4 SCTP_SEND_FAILED | |
507 | * | |
508 | * ssf_flags: 16 bits (unsigned integer) | |
509 | * The flag value will take one of the following values | |
510 | * | |
511 | * SCTP_DATA_UNSENT - Indicates that the data was never put on | |
512 | * the wire. | |
513 | * | |
514 | * SCTP_DATA_SENT - Indicates that the data was put on the wire. | |
515 | * Note that this does not necessarily mean that the | |
516 | * data was (or was not) successfully delivered. | |
517 | */ | |
518 | ssf->ssf_flags = flags; | |
519 | ||
520 | /* Socket Extensions for SCTP | |
521 | * 5.3.1.4 SCTP_SEND_FAILED | |
522 | * | |
523 | * ssf_length: sizeof (__u32) | |
524 | * This field is the total length of the notification data, including | |
525 | * the notification header. | |
526 | */ | |
527 | ssf->ssf_length = sizeof(struct sctp_send_failed) + len; | |
528 | skb_trim(skb, ssf->ssf_length); | |
529 | ||
530 | /* Socket Extensions for SCTP | |
531 | * 5.3.1.4 SCTP_SEND_FAILED | |
532 | * | |
533 | * ssf_error: 16 bits (unsigned integer) | |
534 | * This value represents the reason why the send failed, and if set, | |
535 | * will be a SCTP protocol error code as defined in [SCTP] section | |
536 | * 3.3.10. | |
537 | */ | |
538 | ssf->ssf_error = error; | |
539 | ||
540 | /* Socket Extensions for SCTP | |
541 | * 5.3.1.4 SCTP_SEND_FAILED | |
542 | * | |
543 | * ssf_info: sizeof (struct sctp_sndrcvinfo) | |
544 | * The original send information associated with the undelivered | |
545 | * message. | |
546 | */ | |
547 | memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); | |
548 | ||
549 | /* Per TSVWG discussion with Randy. Allow the application to | |
e9c54999 | 550 | * reassemble a fragmented message. |
1da177e4 LT |
551 | */ |
552 | ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; | |
553 | ||
554 | /* Socket Extensions for SCTP | |
555 | * 5.3.1.4 SCTP_SEND_FAILED | |
556 | * | |
557 | * ssf_assoc_id: sizeof (sctp_assoc_t) | |
558 | * The association id field, sf_assoc_id, holds the identifier for the | |
559 | * association. All notifications for a given association have the | |
560 | * same association identifier. For TCP style socket, this field is | |
561 | * ignored. | |
562 | */ | |
563 | sctp_ulpevent_set_owner(event, asoc); | |
564 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); | |
565 | return event; | |
566 | ||
567 | fail: | |
568 | return NULL; | |
569 | } | |
570 | ||
571 | /* Create and initialize a SCTP_SHUTDOWN_EVENT notification. | |
572 | * | |
573 | * Socket Extensions for SCTP - draft-01 | |
574 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
575 | */ | |
576 | struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( | |
577 | const struct sctp_association *asoc, | |
dd0fc66f | 578 | __u16 flags, gfp_t gfp) |
1da177e4 LT |
579 | { |
580 | struct sctp_ulpevent *event; | |
581 | struct sctp_shutdown_event *sse; | |
582 | struct sk_buff *skb; | |
583 | ||
584 | event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event), | |
585 | MSG_NOTIFICATION, gfp); | |
586 | if (!event) | |
587 | goto fail; | |
588 | ||
589 | skb = sctp_event2skb(event); | |
590 | sse = (struct sctp_shutdown_event *) | |
591 | skb_put(skb, sizeof(struct sctp_shutdown_event)); | |
592 | ||
593 | /* Socket Extensions for SCTP | |
594 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
595 | * | |
596 | * sse_type | |
597 | * It should be SCTP_SHUTDOWN_EVENT | |
598 | */ | |
599 | sse->sse_type = SCTP_SHUTDOWN_EVENT; | |
600 | ||
601 | /* Socket Extensions for SCTP | |
602 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
603 | * | |
604 | * sse_flags: 16 bits (unsigned integer) | |
605 | * Currently unused. | |
606 | */ | |
607 | sse->sse_flags = 0; | |
608 | ||
609 | /* Socket Extensions for SCTP | |
610 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
611 | * | |
612 | * sse_length: sizeof (__u32) | |
613 | * This field is the total length of the notification data, including | |
614 | * the notification header. | |
615 | */ | |
616 | sse->sse_length = sizeof(struct sctp_shutdown_event); | |
617 | ||
618 | /* Socket Extensions for SCTP | |
619 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
620 | * | |
621 | * sse_assoc_id: sizeof (sctp_assoc_t) | |
622 | * The association id field, holds the identifier for the association. | |
623 | * All notifications for a given association have the same association | |
624 | * identifier. For TCP style socket, this field is ignored. | |
625 | */ | |
626 | sctp_ulpevent_set_owner(event, asoc); | |
627 | sse->sse_assoc_id = sctp_assoc2id(asoc); | |
628 | ||
629 | return event; | |
630 | ||
631 | fail: | |
632 | return NULL; | |
633 | } | |
634 | ||
0f3fffd8 | 635 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
1da177e4 LT |
636 | * |
637 | * Socket Extensions for SCTP | |
0f3fffd8 | 638 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
1da177e4 | 639 | */ |
0f3fffd8 | 640 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
dd0fc66f | 641 | const struct sctp_association *asoc, gfp_t gfp) |
1da177e4 LT |
642 | { |
643 | struct sctp_ulpevent *event; | |
0f3fffd8 | 644 | struct sctp_adaptation_event *sai; |
1da177e4 LT |
645 | struct sk_buff *skb; |
646 | ||
0f3fffd8 | 647 | event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event), |
1da177e4 LT |
648 | MSG_NOTIFICATION, gfp); |
649 | if (!event) | |
650 | goto fail; | |
651 | ||
652 | skb = sctp_event2skb(event); | |
0f3fffd8 ISJ |
653 | sai = (struct sctp_adaptation_event *) |
654 | skb_put(skb, sizeof(struct sctp_adaptation_event)); | |
1da177e4 | 655 | |
0f3fffd8 | 656 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
1da177e4 | 657 | sai->sai_flags = 0; |
0f3fffd8 ISJ |
658 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
659 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
660 | sctp_ulpevent_set_owner(event, asoc); |
661 | sai->sai_assoc_id = sctp_assoc2id(asoc); | |
662 | ||
663 | return event; | |
664 | ||
665 | fail: | |
666 | return NULL; | |
667 | } | |
668 | ||
669 | /* A message has been received. Package this message as a notification | |
670 | * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo | |
671 | * even if filtered out later. | |
672 | * | |
673 | * Socket Extensions for SCTP | |
674 | * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) | |
675 | */ | |
676 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, | |
677 | struct sctp_chunk *chunk, | |
dd0fc66f | 678 | gfp_t gfp) |
1da177e4 LT |
679 | { |
680 | struct sctp_ulpevent *event = NULL; | |
681 | struct sk_buff *skb; | |
682 | size_t padding, len; | |
4d93df0a NH |
683 | int rx_count; |
684 | ||
685 | /* | |
686 | * check to see if we need to make space for this | |
687 | * new skb, expand the rcvbuffer if needed, or drop | |
688 | * the frame | |
689 | */ | |
690 | if (asoc->ep->rcvbuf_policy) | |
691 | rx_count = atomic_read(&asoc->rmem_alloc); | |
692 | else | |
693 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); | |
694 | ||
695 | if (rx_count >= asoc->base.sk->sk_rcvbuf) { | |
696 | ||
697 | if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) || | |
c76562b6 MG |
698 | (!sk_rmem_schedule(asoc->base.sk, chunk->skb, |
699 | chunk->skb->truesize))) | |
4d93df0a NH |
700 | goto fail; |
701 | } | |
1da177e4 LT |
702 | |
703 | /* Clone the original skb, sharing the data. */ | |
704 | skb = skb_clone(chunk->skb, gfp); | |
705 | if (!skb) | |
706 | goto fail; | |
707 | ||
3888e9ef VY |
708 | /* Now that all memory allocations for this chunk succeeded, we |
709 | * can mark it as received so the tsn_map is updated correctly. | |
710 | */ | |
8e1ee18c | 711 | if (sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d NH |
712 | ntohl(chunk->subh.data_hdr->tsn), |
713 | chunk->transport)) | |
8e1ee18c | 714 | goto fail_mark; |
3888e9ef | 715 | |
1da177e4 LT |
716 | /* First calculate the padding, so we don't inadvertently |
717 | * pass up the wrong length to the user. | |
718 | * | |
719 | * RFC 2960 - Section 3.2 Chunk Field Descriptions | |
720 | * | |
721 | * The total length of a chunk(including Type, Length and Value fields) | |
722 | * MUST be a multiple of 4 bytes. If the length of the chunk is not a | |
723 | * multiple of 4 bytes, the sender MUST pad the chunk with all zero | |
724 | * bytes and this padding is not included in the chunk length field. | |
725 | * The sender should never pad with more than 3 bytes. The receiver | |
726 | * MUST ignore the padding bytes. | |
727 | */ | |
728 | len = ntohs(chunk->chunk_hdr->length); | |
729 | padding = WORD_ROUND(len) - len; | |
730 | ||
731 | /* Fixup cloned skb with just this chunks data. */ | |
732 | skb_trim(skb, chunk->chunk_end - padding - skb->data); | |
733 | ||
734 | /* Embed the event fields inside the cloned skb. */ | |
735 | event = sctp_skb2event(skb); | |
736 | ||
331c4ee7 VY |
737 | /* Initialize event with flags 0 and correct length |
738 | * Since this is a clone of the original skb, only account for | |
739 | * the data of this chunk as other chunks will be accounted separately. | |
740 | */ | |
741 | sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff)); | |
1da177e4 LT |
742 | |
743 | sctp_ulpevent_receive_data(event, asoc); | |
744 | ||
745 | event->stream = ntohs(chunk->subh.data_hdr->stream); | |
746 | event->ssn = ntohs(chunk->subh.data_hdr->ssn); | |
747 | event->ppid = chunk->subh.data_hdr->ppid; | |
748 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
eaa5c54d | 749 | event->flags |= SCTP_UNORDERED; |
1da177e4 LT |
750 | event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
751 | } | |
752 | event->tsn = ntohl(chunk->subh.data_hdr->tsn); | |
753 | event->msg_flags |= chunk->chunk_hdr->flags; | |
754 | event->iif = sctp_chunk_iif(chunk); | |
755 | ||
1da177e4 | 756 | return event; |
8e1ee18c VY |
757 | |
758 | fail_mark: | |
759 | kfree_skb(skb); | |
760 | fail: | |
761 | return NULL; | |
1da177e4 LT |
762 | } |
763 | ||
764 | /* Create a partial delivery related event. | |
765 | * | |
766 | * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT | |
767 | * | |
768 | * When a receiver is engaged in a partial delivery of a | |
769 | * message this notification will be used to indicate | |
770 | * various events. | |
771 | */ | |
772 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( | |
3182cd84 | 773 | const struct sctp_association *asoc, __u32 indication, |
dd0fc66f | 774 | gfp_t gfp) |
1da177e4 LT |
775 | { |
776 | struct sctp_ulpevent *event; | |
777 | struct sctp_pdapi_event *pd; | |
778 | struct sk_buff *skb; | |
779 | ||
780 | event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event), | |
781 | MSG_NOTIFICATION, gfp); | |
782 | if (!event) | |
783 | goto fail; | |
784 | ||
785 | skb = sctp_event2skb(event); | |
786 | pd = (struct sctp_pdapi_event *) | |
787 | skb_put(skb, sizeof(struct sctp_pdapi_event)); | |
788 | ||
789 | /* pdapi_type | |
790 | * It should be SCTP_PARTIAL_DELIVERY_EVENT | |
791 | * | |
792 | * pdapi_flags: 16 bits (unsigned integer) | |
793 | * Currently unused. | |
794 | */ | |
795 | pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; | |
796 | pd->pdapi_flags = 0; | |
797 | ||
798 | /* pdapi_length: 32 bits (unsigned integer) | |
799 | * | |
800 | * This field is the total length of the notification data, including | |
801 | * the notification header. It will generally be sizeof (struct | |
802 | * sctp_pdapi_event). | |
803 | */ | |
804 | pd->pdapi_length = sizeof(struct sctp_pdapi_event); | |
805 | ||
d808ad9a | 806 | /* pdapi_indication: 32 bits (unsigned integer) |
1da177e4 LT |
807 | * |
808 | * This field holds the indication being sent to the application. | |
809 | */ | |
810 | pd->pdapi_indication = indication; | |
811 | ||
812 | /* pdapi_assoc_id: sizeof (sctp_assoc_t) | |
813 | * | |
814 | * The association id field, holds the identifier for the association. | |
815 | */ | |
816 | sctp_ulpevent_set_owner(event, asoc); | |
817 | pd->pdapi_assoc_id = sctp_assoc2id(asoc); | |
818 | ||
819 | return event; | |
820 | fail: | |
821 | return NULL; | |
822 | } | |
823 | ||
65b07e5d VY |
824 | struct sctp_ulpevent *sctp_ulpevent_make_authkey( |
825 | const struct sctp_association *asoc, __u16 key_id, | |
826 | __u32 indication, gfp_t gfp) | |
827 | { | |
828 | struct sctp_ulpevent *event; | |
829 | struct sctp_authkey_event *ak; | |
830 | struct sk_buff *skb; | |
831 | ||
832 | event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event), | |
833 | MSG_NOTIFICATION, gfp); | |
834 | if (!event) | |
835 | goto fail; | |
836 | ||
837 | skb = sctp_event2skb(event); | |
838 | ak = (struct sctp_authkey_event *) | |
839 | skb_put(skb, sizeof(struct sctp_authkey_event)); | |
840 | ||
ee916fd0 | 841 | ak->auth_type = SCTP_AUTHENTICATION_EVENT; |
65b07e5d VY |
842 | ak->auth_flags = 0; |
843 | ak->auth_length = sizeof(struct sctp_authkey_event); | |
844 | ||
845 | ak->auth_keynumber = key_id; | |
846 | ak->auth_altkeynumber = 0; | |
847 | ak->auth_indication = indication; | |
848 | ||
849 | /* | |
850 | * The association id field, holds the identifier for the association. | |
851 | */ | |
852 | sctp_ulpevent_set_owner(event, asoc); | |
853 | ak->auth_assoc_id = sctp_assoc2id(asoc); | |
854 | ||
855 | return event; | |
856 | fail: | |
857 | return NULL; | |
858 | } | |
859 | ||
e1cdd553 WY |
860 | /* |
861 | * Socket Extensions for SCTP | |
862 | * 6.3.10. SCTP_SENDER_DRY_EVENT | |
863 | */ | |
864 | struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event( | |
865 | const struct sctp_association *asoc, gfp_t gfp) | |
866 | { | |
867 | struct sctp_ulpevent *event; | |
868 | struct sctp_sender_dry_event *sdry; | |
869 | struct sk_buff *skb; | |
870 | ||
871 | event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event), | |
872 | MSG_NOTIFICATION, gfp); | |
873 | if (!event) | |
874 | return NULL; | |
875 | ||
876 | skb = sctp_event2skb(event); | |
877 | sdry = (struct sctp_sender_dry_event *) | |
878 | skb_put(skb, sizeof(struct sctp_sender_dry_event)); | |
879 | ||
880 | sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT; | |
881 | sdry->sender_dry_flags = 0; | |
882 | sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event); | |
883 | sctp_ulpevent_set_owner(event, asoc); | |
884 | sdry->sender_dry_assoc_id = sctp_assoc2id(asoc); | |
885 | ||
886 | return event; | |
887 | } | |
65b07e5d | 888 | |
1da177e4 LT |
889 | /* Return the notification type, assuming this is a notification |
890 | * event. | |
891 | */ | |
892 | __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) | |
893 | { | |
894 | union sctp_notification *notification; | |
895 | struct sk_buff *skb; | |
896 | ||
ab38fb04 | 897 | skb = sctp_event2skb(event); |
1da177e4 LT |
898 | notification = (union sctp_notification *) skb->data; |
899 | return notification->sn_header.sn_type; | |
900 | } | |
901 | ||
902 | /* Copy out the sndrcvinfo into a msghdr. */ | |
903 | void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, | |
904 | struct msghdr *msghdr) | |
905 | { | |
906 | struct sctp_sndrcvinfo sinfo; | |
907 | ||
908 | if (sctp_ulpevent_is_notification(event)) | |
909 | return; | |
910 | ||
911 | /* Sockets API Extensions for SCTP | |
d808ad9a YH |
912 | * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
913 | * | |
914 | * sinfo_stream: 16 bits (unsigned integer) | |
915 | * | |
916 | * For recvmsg() the SCTP stack places the message's stream number in | |
917 | * this value. | |
918 | */ | |
1da177e4 LT |
919 | sinfo.sinfo_stream = event->stream; |
920 | /* sinfo_ssn: 16 bits (unsigned integer) | |
921 | * | |
922 | * For recvmsg() this value contains the stream sequence number that | |
923 | * the remote endpoint placed in the DATA chunk. For fragmented | |
924 | * messages this is the same number for all deliveries of the message | |
925 | * (if more than one recvmsg() is needed to read the message). | |
926 | */ | |
927 | sinfo.sinfo_ssn = event->ssn; | |
928 | /* sinfo_ppid: 32 bits (unsigned integer) | |
929 | * | |
930 | * In recvmsg() this value is | |
931 | * the same information that was passed by the upper layer in the peer | |
932 | * application. Please note that byte order issues are NOT accounted | |
933 | * for and this information is passed opaquely by the SCTP stack from | |
934 | * one end to the other. | |
935 | */ | |
936 | sinfo.sinfo_ppid = event->ppid; | |
937 | /* sinfo_flags: 16 bits (unsigned integer) | |
938 | * | |
939 | * This field may contain any of the following flags and is composed of | |
940 | * a bitwise OR of these values. | |
941 | * | |
942 | * recvmsg() flags: | |
943 | * | |
eaa5c54d | 944 | * SCTP_UNORDERED - This flag is present when the message was sent |
1da177e4 LT |
945 | * non-ordered. |
946 | */ | |
947 | sinfo.sinfo_flags = event->flags; | |
948 | /* sinfo_tsn: 32 bit (unsigned integer) | |
949 | * | |
d808ad9a | 950 | * For the receiving side, this field holds a TSN that was |
1da177e4 LT |
951 | * assigned to one of the SCTP Data Chunks. |
952 | */ | |
953 | sinfo.sinfo_tsn = event->tsn; | |
954 | /* sinfo_cumtsn: 32 bit (unsigned integer) | |
955 | * | |
956 | * This field will hold the current cumulative TSN as | |
957 | * known by the underlying SCTP layer. Note this field is | |
958 | * ignored when sending and only valid for a receive | |
eaa5c54d | 959 | * operation when sinfo_flags are set to SCTP_UNORDERED. |
1da177e4 LT |
960 | */ |
961 | sinfo.sinfo_cumtsn = event->cumtsn; | |
962 | /* sinfo_assoc_id: sizeof (sctp_assoc_t) | |
963 | * | |
964 | * The association handle field, sinfo_assoc_id, holds the identifier | |
965 | * for the association announced in the COMMUNICATION_UP notification. | |
966 | * All notifications for a given association have the same identifier. | |
967 | * Ignored for one-to-one style sockets. | |
968 | */ | |
969 | sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); | |
970 | ||
6ab792f5 ISJ |
971 | /* context value that is set via SCTP_CONTEXT socket option. */ |
972 | sinfo.sinfo_context = event->asoc->default_rcv_context; | |
973 | ||
1da177e4 | 974 | /* These fields are not used while receiving. */ |
1da177e4 LT |
975 | sinfo.sinfo_timetolive = 0; |
976 | ||
977 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, | |
978 | sizeof(struct sctp_sndrcvinfo), (void *)&sinfo); | |
979 | } | |
980 | ||
981 | /* Do accounting for bytes received and hold a reference to the association | |
982 | * for each skb. | |
983 | */ | |
984 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
985 | struct sctp_association *asoc) | |
986 | { | |
987 | struct sk_buff *skb, *frag; | |
988 | ||
989 | skb = sctp_event2skb(event); | |
990 | /* Set the owner and charge rwnd for bytes received. */ | |
991 | sctp_ulpevent_set_owner(event, asoc); | |
ef2820a7 | 992 | sctp_assoc_rwnd_update(asoc, false); |
1da177e4 LT |
993 | |
994 | if (!skb->data_len) | |
995 | return; | |
996 | ||
997 | /* Note: Not clearing the entire event struct as this is just a | |
998 | * fragment of the real event. However, we still need to do rwnd | |
999 | * accounting. | |
1000 | * In general, the skb passed from IP can have only 1 level of | |
d808ad9a | 1001 | * fragments. But we allow multiple levels of fragments. |
1da177e4 | 1002 | */ |
1b003be3 | 1003 | skb_walk_frags(skb, frag) |
1da177e4 | 1004 | sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | /* Do accounting for bytes just read by user and release the references to | |
1008 | * the association. | |
d808ad9a | 1009 | */ |
1da177e4 LT |
1010 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
1011 | { | |
1012 | struct sk_buff *skb, *frag; | |
d7c2c9e3 | 1013 | unsigned int len; |
ef2820a7 | 1014 | struct sctp_association *asoc; |
1da177e4 LT |
1015 | |
1016 | /* Current stack structures assume that the rcv buffer is | |
1017 | * per socket. For UDP style sockets this is not true as | |
1018 | * multiple associations may be on a single UDP-style socket. | |
1019 | * Use the local private area of the skb to track the owning | |
1020 | * association. | |
1021 | */ | |
1022 | ||
1023 | skb = sctp_event2skb(event); | |
d7c2c9e3 TF |
1024 | len = skb->len; |
1025 | ||
1026 | if (!skb->data_len) | |
1027 | goto done; | |
1028 | ||
1029 | /* Don't forget the fragments. */ | |
1b003be3 | 1030 | skb_walk_frags(skb, frag) { |
d7c2c9e3 TF |
1031 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1032 | * skb's with only 1 level of fragments, SCTP reassembly can | |
1033 | * increase the levels. | |
1034 | */ | |
1035 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); | |
1036 | } | |
1037 | ||
1038 | done: | |
ef2820a7 MGP |
1039 | asoc = event->asoc; |
1040 | sctp_association_hold(asoc); | |
d7c2c9e3 | 1041 | sctp_ulpevent_release_owner(event); |
ef2820a7 MGP |
1042 | sctp_assoc_rwnd_update(asoc, true); |
1043 | sctp_association_put(asoc); | |
d7c2c9e3 TF |
1044 | } |
1045 | ||
1046 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) | |
1047 | { | |
1048 | struct sk_buff *skb, *frag; | |
1049 | ||
1050 | skb = sctp_event2skb(event); | |
1da177e4 LT |
1051 | |
1052 | if (!skb->data_len) | |
1053 | goto done; | |
1054 | ||
1055 | /* Don't forget the fragments. */ | |
1b003be3 | 1056 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
1057 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1058 | * skb's with only 1 level of fragments, SCTP reassembly can | |
1059 | * increase the levels. | |
1060 | */ | |
d7c2c9e3 | 1061 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | done: | |
1065 | sctp_ulpevent_release_owner(event); | |
1066 | } | |
1067 | ||
1068 | /* Free a ulpevent that has an owner. It includes releasing the reference | |
1069 | * to the owner, updating the rwnd in case of a DATA event and freeing the | |
1070 | * skb. | |
1da177e4 LT |
1071 | */ |
1072 | void sctp_ulpevent_free(struct sctp_ulpevent *event) | |
1073 | { | |
1074 | if (sctp_ulpevent_is_notification(event)) | |
1075 | sctp_ulpevent_release_owner(event); | |
1076 | else | |
1077 | sctp_ulpevent_release_data(event); | |
1078 | ||
1079 | kfree_skb(sctp_event2skb(event)); | |
1080 | } | |
1081 | ||
1082 | /* Purge the skb lists holding ulpevents. */ | |
cd4fcc70 | 1083 | unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
1da177e4 LT |
1084 | { |
1085 | struct sk_buff *skb; | |
cd4fcc70 TG |
1086 | unsigned int data_unread = 0; |
1087 | ||
1088 | while ((skb = skb_dequeue(list)) != NULL) { | |
1089 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
1090 | ||
1091 | if (!sctp_ulpevent_is_notification(event)) | |
1092 | data_unread += skb->len; | |
1093 | ||
1094 | sctp_ulpevent_free(event); | |
1095 | } | |
1096 | ||
1097 | return data_unread; | |
1da177e4 | 1098 | } |