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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 | |
25 | * along with GNU CC; see the file COPYING. If not, write to | |
26 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
27 | * Boston, MA 02111-1307, USA. | |
28 | * | |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
91705c61 | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 32 | * |
1da177e4 LT |
33 | * Written or modified by: |
34 | * Jon Grimm <jgrimm@us.ibm.com> | |
35 | * La Monte H.P. Yarroll <piggy@acm.org> | |
36 | * Ardelle Fan <ardelle.fan@intel.com> | |
37 | * Sridhar Samudrala <sri@us.ibm.com> | |
1da177e4 LT |
38 | */ |
39 | ||
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 LT |
41 | #include <linux/types.h> |
42 | #include <linux/skbuff.h> | |
43 | #include <net/sctp/structs.h> | |
44 | #include <net/sctp/sctp.h> | |
45 | #include <net/sctp/sm.h> | |
46 | ||
47 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
48 | struct sctp_association *asoc); | |
49 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event); | |
d7c2c9e3 TF |
50 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event); |
51 | ||
1da177e4 | 52 | |
1da177e4 | 53 | /* Initialize an ULP event from an given skb. */ |
dda91928 DB |
54 | static void sctp_ulpevent_init(struct sctp_ulpevent *event, |
55 | int msg_flags, | |
56 | unsigned int len) | |
1da177e4 LT |
57 | { |
58 | memset(event, 0, sizeof(struct sctp_ulpevent)); | |
59 | event->msg_flags = msg_flags; | |
331c4ee7 | 60 | event->rmem_len = len; |
1da177e4 LT |
61 | } |
62 | ||
63 | /* Create a new sctp_ulpevent. */ | |
dda91928 DB |
64 | static struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags, |
65 | gfp_t gfp) | |
1da177e4 LT |
66 | { |
67 | struct sctp_ulpevent *event; | |
68 | struct sk_buff *skb; | |
69 | ||
70 | skb = alloc_skb(size, gfp); | |
71 | if (!skb) | |
72 | goto fail; | |
73 | ||
74 | event = sctp_skb2event(skb); | |
331c4ee7 | 75 | sctp_ulpevent_init(event, msg_flags, skb->truesize); |
1da177e4 LT |
76 | |
77 | return event; | |
78 | ||
79 | fail: | |
80 | return NULL; | |
81 | } | |
82 | ||
83 | /* Is this a MSG_NOTIFICATION? */ | |
84 | int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event) | |
85 | { | |
86 | return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION); | |
87 | } | |
88 | ||
89 | /* Hold the association in case the msg_name needs read out of | |
90 | * the association. | |
91 | */ | |
92 | static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event, | |
93 | const struct sctp_association *asoc) | |
94 | { | |
95 | 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); | |
1da177e4 | 102 | event->asoc = (struct sctp_association *)asoc; |
331c4ee7 VY |
103 | atomic_add(event->rmem_len, &event->asoc->rmem_alloc); |
104 | sctp_skb_set_owner_r(skb, asoc->base.sk); | |
1da177e4 LT |
105 | } |
106 | ||
107 | /* A simple destructor to give up the reference to the association. */ | |
108 | static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) | |
109 | { | |
049b3ff5 | 110 | struct sctp_association *asoc = event->asoc; |
049b3ff5 | 111 | |
331c4ee7 | 112 | atomic_sub(event->rmem_len, &asoc->rmem_alloc); |
049b3ff5 | 113 | sctp_association_put(asoc); |
1da177e4 LT |
114 | } |
115 | ||
116 | /* Create and initialize an SCTP_ASSOC_CHANGE event. | |
117 | * | |
118 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
119 | * | |
120 | * Communication notifications inform the ULP that an SCTP association | |
121 | * has either begun or ended. The identifier for a new association is | |
122 | * provided by this notification. | |
123 | * | |
124 | * Note: There is no field checking here. If a field is unused it will be | |
125 | * zero'd out. | |
126 | */ | |
127 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( | |
128 | const struct sctp_association *asoc, | |
129 | __u16 flags, __u16 state, __u16 error, __u16 outbound, | |
a5a35e76 | 130 | __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp) |
1da177e4 LT |
131 | { |
132 | struct sctp_ulpevent *event; | |
133 | struct sctp_assoc_change *sac; | |
134 | struct sk_buff *skb; | |
135 | ||
a5a35e76 VY |
136 | /* If the lower layer passed in the chunk, it will be |
137 | * an ABORT, so we need to include it in the sac_info. | |
138 | */ | |
139 | if (chunk) { | |
a5a35e76 VY |
140 | /* Copy the chunk data to a new skb and reserve enough |
141 | * head room to use as notification. | |
142 | */ | |
143 | skb = skb_copy_expand(chunk->skb, | |
144 | sizeof(struct sctp_assoc_change), 0, gfp); | |
145 | ||
146 | if (!skb) | |
147 | goto fail; | |
148 | ||
a5a35e76 VY |
149 | /* Embed the event fields inside the cloned skb. */ |
150 | event = sctp_skb2event(skb); | |
151 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); | |
152 | ||
153 | /* Include the notification structure */ | |
154 | sac = (struct sctp_assoc_change *) | |
155 | skb_push(skb, sizeof(struct sctp_assoc_change)); | |
156 | ||
157 | /* Trim the buffer to the right length. */ | |
158 | skb_trim(skb, sizeof(struct sctp_assoc_change) + | |
ac40e41f VY |
159 | ntohs(chunk->chunk_hdr->length) - |
160 | sizeof(sctp_chunkhdr_t)); | |
a5a35e76 VY |
161 | } else { |
162 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change), | |
1da177e4 | 163 | MSG_NOTIFICATION, gfp); |
a5a35e76 VY |
164 | if (!event) |
165 | goto fail; | |
166 | ||
167 | skb = sctp_event2skb(event); | |
168 | sac = (struct sctp_assoc_change *) skb_put(skb, | |
169 | sizeof(struct sctp_assoc_change)); | |
170 | } | |
1da177e4 LT |
171 | |
172 | /* Socket Extensions for SCTP | |
173 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
174 | * | |
175 | * sac_type: | |
176 | * It should be SCTP_ASSOC_CHANGE. | |
177 | */ | |
178 | sac->sac_type = SCTP_ASSOC_CHANGE; | |
179 | ||
180 | /* Socket Extensions for SCTP | |
181 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
182 | * | |
183 | * sac_state: 32 bits (signed integer) | |
184 | * This field holds one of a number of values that communicate the | |
185 | * event that happened to the association. | |
186 | */ | |
187 | sac->sac_state = state; | |
188 | ||
189 | /* Socket Extensions for SCTP | |
190 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
191 | * | |
192 | * sac_flags: 16 bits (unsigned integer) | |
193 | * Currently unused. | |
194 | */ | |
195 | sac->sac_flags = 0; | |
196 | ||
197 | /* Socket Extensions for SCTP | |
198 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
199 | * | |
200 | * sac_length: sizeof (__u32) | |
201 | * This field is the total length of the notification data, including | |
202 | * the notification header. | |
203 | */ | |
b90a137d | 204 | sac->sac_length = skb->len; |
1da177e4 LT |
205 | |
206 | /* Socket Extensions for SCTP | |
207 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
208 | * | |
209 | * sac_error: 32 bits (signed integer) | |
210 | * | |
211 | * If the state was reached due to a error condition (e.g. | |
212 | * COMMUNICATION_LOST) any relevant error information is available in | |
213 | * this field. This corresponds to the protocol error codes defined in | |
214 | * [SCTP]. | |
215 | */ | |
216 | sac->sac_error = error; | |
217 | ||
218 | /* Socket Extensions for SCTP | |
219 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
220 | * | |
221 | * sac_outbound_streams: 16 bits (unsigned integer) | |
222 | * sac_inbound_streams: 16 bits (unsigned integer) | |
223 | * | |
224 | * The maximum number of streams allowed in each direction are | |
225 | * available in sac_outbound_streams and sac_inbound streams. | |
226 | */ | |
227 | sac->sac_outbound_streams = outbound; | |
228 | sac->sac_inbound_streams = inbound; | |
229 | ||
230 | /* Socket Extensions for SCTP | |
231 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
232 | * | |
233 | * sac_assoc_id: sizeof (sctp_assoc_t) | |
234 | * | |
235 | * The association id field, holds the identifier for the association. | |
236 | * All notifications for a given association have the same association | |
237 | * identifier. For TCP style socket, this field is ignored. | |
238 | */ | |
239 | sctp_ulpevent_set_owner(event, asoc); | |
240 | sac->sac_assoc_id = sctp_assoc2id(asoc); | |
241 | ||
242 | return event; | |
243 | ||
244 | fail: | |
245 | return NULL; | |
246 | } | |
247 | ||
248 | /* Create and initialize an SCTP_PEER_ADDR_CHANGE event. | |
249 | * | |
250 | * Socket Extensions for SCTP - draft-01 | |
251 | * 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
252 | * | |
253 | * When a destination address on a multi-homed peer encounters a change | |
254 | * an interface details event is sent. | |
255 | */ | |
256 | struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change( | |
257 | const struct sctp_association *asoc, | |
258 | const struct sockaddr_storage *aaddr, | |
dd0fc66f | 259 | int flags, int state, int error, gfp_t gfp) |
1da177e4 LT |
260 | { |
261 | struct sctp_ulpevent *event; | |
262 | struct sctp_paddr_change *spc; | |
263 | struct sk_buff *skb; | |
264 | ||
265 | event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change), | |
266 | MSG_NOTIFICATION, gfp); | |
267 | if (!event) | |
268 | goto fail; | |
269 | ||
270 | skb = sctp_event2skb(event); | |
271 | spc = (struct sctp_paddr_change *) | |
272 | skb_put(skb, sizeof(struct sctp_paddr_change)); | |
273 | ||
274 | /* Sockets API Extensions for SCTP | |
275 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
276 | * | |
277 | * spc_type: | |
278 | * | |
279 | * It should be SCTP_PEER_ADDR_CHANGE. | |
280 | */ | |
281 | spc->spc_type = SCTP_PEER_ADDR_CHANGE; | |
282 | ||
283 | /* Sockets API Extensions for SCTP | |
284 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
285 | * | |
286 | * spc_length: sizeof (__u32) | |
287 | * | |
288 | * This field is the total length of the notification data, including | |
289 | * the notification header. | |
290 | */ | |
291 | spc->spc_length = sizeof(struct sctp_paddr_change); | |
292 | ||
293 | /* Sockets API Extensions for SCTP | |
294 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
295 | * | |
296 | * spc_flags: 16 bits (unsigned integer) | |
297 | * Currently unused. | |
298 | */ | |
299 | spc->spc_flags = 0; | |
300 | ||
301 | /* Sockets API Extensions for SCTP | |
302 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
303 | * | |
304 | * spc_state: 32 bits (signed integer) | |
305 | * | |
306 | * This field holds one of a number of values that communicate the | |
307 | * event that happened to the address. | |
308 | */ | |
309 | spc->spc_state = state; | |
310 | ||
311 | /* Sockets API Extensions for SCTP | |
312 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
313 | * | |
314 | * spc_error: 32 bits (signed integer) | |
315 | * | |
316 | * If the state was reached due to any error condition (e.g. | |
317 | * ADDRESS_UNREACHABLE) any relevant error information is available in | |
318 | * this field. | |
319 | */ | |
320 | spc->spc_error = error; | |
321 | ||
322 | /* Socket Extensions for SCTP | |
323 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
324 | * | |
325 | * spc_assoc_id: sizeof (sctp_assoc_t) | |
326 | * | |
327 | * The association id field, holds the identifier for the association. | |
328 | * All notifications for a given association have the same association | |
329 | * identifier. For TCP style socket, this field is ignored. | |
330 | */ | |
331 | sctp_ulpevent_set_owner(event, asoc); | |
332 | spc->spc_assoc_id = sctp_assoc2id(asoc); | |
333 | ||
334 | /* Sockets API Extensions for SCTP | |
335 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
336 | * | |
337 | * spc_aaddr: sizeof (struct sockaddr_storage) | |
338 | * | |
339 | * The affected address field, holds the remote peer's address that is | |
340 | * encountering the change of state. | |
341 | */ | |
342 | memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage)); | |
343 | ||
344 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
345 | sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map( | |
346 | sctp_sk(asoc->base.sk), | |
347 | (union sctp_addr *)&spc->spc_aaddr); | |
348 | ||
349 | return event; | |
350 | ||
351 | fail: | |
352 | return NULL; | |
353 | } | |
354 | ||
355 | /* Create and initialize an SCTP_REMOTE_ERROR notification. | |
356 | * | |
357 | * Note: This assumes that the chunk->skb->data already points to the | |
358 | * operation error payload. | |
359 | * | |
360 | * Socket Extensions for SCTP - draft-01 | |
361 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
362 | * | |
363 | * A remote peer may send an Operational Error message to its peer. | |
364 | * This message indicates a variety of error conditions on an | |
365 | * association. The entire error TLV as it appears on the wire is | |
366 | * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP | |
367 | * specification [SCTP] and any extensions for a list of possible | |
368 | * error formats. | |
369 | */ | |
370 | struct sctp_ulpevent *sctp_ulpevent_make_remote_error( | |
371 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 372 | __u16 flags, 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 | */ | |
391 | skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error), | |
392 | 0, gfp); | |
393 | ||
394 | /* Pull off the rest of the cause TLV from the chunk. */ | |
395 | skb_pull(chunk->skb, elen); | |
396 | if (!skb) | |
397 | goto fail; | |
398 | ||
399 | /* Embed the event fields inside the cloned skb. */ | |
400 | event = sctp_skb2event(skb); | |
331c4ee7 | 401 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 LT |
402 | |
403 | sre = (struct sctp_remote_error *) | |
404 | skb_push(skb, sizeof(struct sctp_remote_error)); | |
405 | ||
406 | /* Trim the buffer to the right length. */ | |
407 | skb_trim(skb, sizeof(struct sctp_remote_error) + elen); | |
408 | ||
409 | /* Socket Extensions for SCTP | |
410 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
411 | * | |
412 | * sre_type: | |
413 | * It should be SCTP_REMOTE_ERROR. | |
414 | */ | |
415 | sre->sre_type = SCTP_REMOTE_ERROR; | |
416 | ||
417 | /* | |
418 | * Socket Extensions for SCTP | |
419 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
420 | * | |
421 | * sre_flags: 16 bits (unsigned integer) | |
422 | * Currently unused. | |
423 | */ | |
424 | sre->sre_flags = 0; | |
425 | ||
426 | /* Socket Extensions for SCTP | |
427 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
428 | * | |
429 | * sre_length: sizeof (__u32) | |
430 | * | |
431 | * This field is the total length of the notification data, | |
432 | * including the notification header. | |
433 | */ | |
434 | sre->sre_length = skb->len; | |
435 | ||
436 | /* Socket Extensions for SCTP | |
437 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
438 | * | |
439 | * sre_error: 16 bits (unsigned integer) | |
440 | * This value represents one of the Operational Error causes defined in | |
441 | * the SCTP specification, in network byte order. | |
442 | */ | |
443 | sre->sre_error = cause; | |
444 | ||
445 | /* Socket Extensions for SCTP | |
446 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
447 | * | |
448 | * sre_assoc_id: sizeof (sctp_assoc_t) | |
449 | * | |
450 | * The association id field, holds the identifier for the association. | |
451 | * All notifications for a given association have the same association | |
452 | * identifier. For TCP style socket, this field is ignored. | |
453 | */ | |
454 | sctp_ulpevent_set_owner(event, asoc); | |
455 | sre->sre_assoc_id = sctp_assoc2id(asoc); | |
456 | ||
457 | return event; | |
458 | ||
459 | fail: | |
460 | return NULL; | |
461 | } | |
462 | ||
463 | /* Create and initialize a SCTP_SEND_FAILED notification. | |
464 | * | |
465 | * Socket Extensions for SCTP - draft-01 | |
466 | * 5.3.1.4 SCTP_SEND_FAILED | |
467 | */ | |
468 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( | |
469 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 470 | __u16 flags, __u32 error, gfp_t gfp) |
1da177e4 LT |
471 | { |
472 | struct sctp_ulpevent *event; | |
473 | struct sctp_send_failed *ssf; | |
474 | struct sk_buff *skb; | |
475 | ||
476 | /* Pull off any padding. */ | |
477 | int len = ntohs(chunk->chunk_hdr->length); | |
478 | ||
479 | /* Make skb with more room so we can prepend notification. */ | |
480 | skb = skb_copy_expand(chunk->skb, | |
481 | sizeof(struct sctp_send_failed), /* headroom */ | |
482 | 0, /* tailroom */ | |
483 | gfp); | |
484 | if (!skb) | |
485 | goto fail; | |
486 | ||
487 | /* Pull off the common chunk header and DATA header. */ | |
488 | skb_pull(skb, sizeof(struct sctp_data_chunk)); | |
489 | len -= sizeof(struct sctp_data_chunk); | |
490 | ||
491 | /* Embed the event fields inside the cloned skb. */ | |
492 | event = sctp_skb2event(skb); | |
331c4ee7 | 493 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 LT |
494 | |
495 | ssf = (struct sctp_send_failed *) | |
496 | skb_push(skb, sizeof(struct sctp_send_failed)); | |
497 | ||
498 | /* Socket Extensions for SCTP | |
499 | * 5.3.1.4 SCTP_SEND_FAILED | |
500 | * | |
501 | * ssf_type: | |
502 | * It should be SCTP_SEND_FAILED. | |
503 | */ | |
504 | ssf->ssf_type = SCTP_SEND_FAILED; | |
505 | ||
506 | /* Socket Extensions for SCTP | |
507 | * 5.3.1.4 SCTP_SEND_FAILED | |
508 | * | |
509 | * ssf_flags: 16 bits (unsigned integer) | |
510 | * The flag value will take one of the following values | |
511 | * | |
512 | * SCTP_DATA_UNSENT - Indicates that the data was never put on | |
513 | * the wire. | |
514 | * | |
515 | * SCTP_DATA_SENT - Indicates that the data was put on the wire. | |
516 | * Note that this does not necessarily mean that the | |
517 | * data was (or was not) successfully delivered. | |
518 | */ | |
519 | ssf->ssf_flags = flags; | |
520 | ||
521 | /* Socket Extensions for SCTP | |
522 | * 5.3.1.4 SCTP_SEND_FAILED | |
523 | * | |
524 | * ssf_length: sizeof (__u32) | |
525 | * This field is the total length of the notification data, including | |
526 | * the notification header. | |
527 | */ | |
528 | ssf->ssf_length = sizeof(struct sctp_send_failed) + len; | |
529 | skb_trim(skb, ssf->ssf_length); | |
530 | ||
531 | /* Socket Extensions for SCTP | |
532 | * 5.3.1.4 SCTP_SEND_FAILED | |
533 | * | |
534 | * ssf_error: 16 bits (unsigned integer) | |
535 | * This value represents the reason why the send failed, and if set, | |
536 | * will be a SCTP protocol error code as defined in [SCTP] section | |
537 | * 3.3.10. | |
538 | */ | |
539 | ssf->ssf_error = error; | |
540 | ||
541 | /* Socket Extensions for SCTP | |
542 | * 5.3.1.4 SCTP_SEND_FAILED | |
543 | * | |
544 | * ssf_info: sizeof (struct sctp_sndrcvinfo) | |
545 | * The original send information associated with the undelivered | |
546 | * message. | |
547 | */ | |
548 | memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); | |
549 | ||
550 | /* Per TSVWG discussion with Randy. Allow the application to | |
e9c54999 | 551 | * reassemble a fragmented message. |
1da177e4 LT |
552 | */ |
553 | ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; | |
554 | ||
555 | /* Socket Extensions for SCTP | |
556 | * 5.3.1.4 SCTP_SEND_FAILED | |
557 | * | |
558 | * ssf_assoc_id: sizeof (sctp_assoc_t) | |
559 | * The association id field, sf_assoc_id, holds the identifier for the | |
560 | * association. All notifications for a given association have the | |
561 | * same association identifier. For TCP style socket, this field is | |
562 | * ignored. | |
563 | */ | |
564 | sctp_ulpevent_set_owner(event, asoc); | |
565 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); | |
566 | return event; | |
567 | ||
568 | fail: | |
569 | return NULL; | |
570 | } | |
571 | ||
572 | /* Create and initialize a SCTP_SHUTDOWN_EVENT notification. | |
573 | * | |
574 | * Socket Extensions for SCTP - draft-01 | |
575 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
576 | */ | |
577 | struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( | |
578 | const struct sctp_association *asoc, | |
dd0fc66f | 579 | __u16 flags, gfp_t gfp) |
1da177e4 LT |
580 | { |
581 | struct sctp_ulpevent *event; | |
582 | struct sctp_shutdown_event *sse; | |
583 | struct sk_buff *skb; | |
584 | ||
585 | event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event), | |
586 | MSG_NOTIFICATION, gfp); | |
587 | if (!event) | |
588 | goto fail; | |
589 | ||
590 | skb = sctp_event2skb(event); | |
591 | sse = (struct sctp_shutdown_event *) | |
592 | skb_put(skb, sizeof(struct sctp_shutdown_event)); | |
593 | ||
594 | /* Socket Extensions for SCTP | |
595 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
596 | * | |
597 | * sse_type | |
598 | * It should be SCTP_SHUTDOWN_EVENT | |
599 | */ | |
600 | sse->sse_type = SCTP_SHUTDOWN_EVENT; | |
601 | ||
602 | /* Socket Extensions for SCTP | |
603 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
604 | * | |
605 | * sse_flags: 16 bits (unsigned integer) | |
606 | * Currently unused. | |
607 | */ | |
608 | sse->sse_flags = 0; | |
609 | ||
610 | /* Socket Extensions for SCTP | |
611 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
612 | * | |
613 | * sse_length: sizeof (__u32) | |
614 | * This field is the total length of the notification data, including | |
615 | * the notification header. | |
616 | */ | |
617 | sse->sse_length = sizeof(struct sctp_shutdown_event); | |
618 | ||
619 | /* Socket Extensions for SCTP | |
620 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
621 | * | |
622 | * sse_assoc_id: sizeof (sctp_assoc_t) | |
623 | * The association id field, holds the identifier for the association. | |
624 | * All notifications for a given association have the same association | |
625 | * identifier. For TCP style socket, this field is ignored. | |
626 | */ | |
627 | sctp_ulpevent_set_owner(event, asoc); | |
628 | sse->sse_assoc_id = sctp_assoc2id(asoc); | |
629 | ||
630 | return event; | |
631 | ||
632 | fail: | |
633 | return NULL; | |
634 | } | |
635 | ||
0f3fffd8 | 636 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
1da177e4 LT |
637 | * |
638 | * Socket Extensions for SCTP | |
0f3fffd8 | 639 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
1da177e4 | 640 | */ |
0f3fffd8 | 641 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
dd0fc66f | 642 | const struct sctp_association *asoc, gfp_t gfp) |
1da177e4 LT |
643 | { |
644 | struct sctp_ulpevent *event; | |
0f3fffd8 | 645 | struct sctp_adaptation_event *sai; |
1da177e4 LT |
646 | struct sk_buff *skb; |
647 | ||
0f3fffd8 | 648 | event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event), |
1da177e4 LT |
649 | MSG_NOTIFICATION, gfp); |
650 | if (!event) | |
651 | goto fail; | |
652 | ||
653 | skb = sctp_event2skb(event); | |
0f3fffd8 ISJ |
654 | sai = (struct sctp_adaptation_event *) |
655 | skb_put(skb, sizeof(struct sctp_adaptation_event)); | |
1da177e4 | 656 | |
0f3fffd8 | 657 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
1da177e4 | 658 | sai->sai_flags = 0; |
0f3fffd8 ISJ |
659 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
660 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
661 | sctp_ulpevent_set_owner(event, asoc); |
662 | sai->sai_assoc_id = sctp_assoc2id(asoc); | |
663 | ||
664 | return event; | |
665 | ||
666 | fail: | |
667 | return NULL; | |
668 | } | |
669 | ||
670 | /* A message has been received. Package this message as a notification | |
671 | * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo | |
672 | * even if filtered out later. | |
673 | * | |
674 | * Socket Extensions for SCTP | |
675 | * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) | |
676 | */ | |
677 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, | |
678 | struct sctp_chunk *chunk, | |
dd0fc66f | 679 | gfp_t gfp) |
1da177e4 LT |
680 | { |
681 | struct sctp_ulpevent *event = NULL; | |
682 | struct sk_buff *skb; | |
683 | size_t padding, len; | |
4d93df0a NH |
684 | int rx_count; |
685 | ||
686 | /* | |
687 | * check to see if we need to make space for this | |
688 | * new skb, expand the rcvbuffer if needed, or drop | |
689 | * the frame | |
690 | */ | |
691 | if (asoc->ep->rcvbuf_policy) | |
692 | rx_count = atomic_read(&asoc->rmem_alloc); | |
693 | else | |
694 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); | |
695 | ||
696 | if (rx_count >= asoc->base.sk->sk_rcvbuf) { | |
697 | ||
698 | if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) || | |
c76562b6 MG |
699 | (!sk_rmem_schedule(asoc->base.sk, chunk->skb, |
700 | chunk->skb->truesize))) | |
4d93df0a NH |
701 | goto fail; |
702 | } | |
1da177e4 LT |
703 | |
704 | /* Clone the original skb, sharing the data. */ | |
705 | skb = skb_clone(chunk->skb, gfp); | |
706 | if (!skb) | |
707 | goto fail; | |
708 | ||
3888e9ef VY |
709 | /* Now that all memory allocations for this chunk succeeded, we |
710 | * can mark it as received so the tsn_map is updated correctly. | |
711 | */ | |
8e1ee18c | 712 | if (sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d NH |
713 | ntohl(chunk->subh.data_hdr->tsn), |
714 | chunk->transport)) | |
8e1ee18c | 715 | goto fail_mark; |
3888e9ef | 716 | |
1da177e4 LT |
717 | /* First calculate the padding, so we don't inadvertently |
718 | * pass up the wrong length to the user. | |
719 | * | |
720 | * RFC 2960 - Section 3.2 Chunk Field Descriptions | |
721 | * | |
722 | * The total length of a chunk(including Type, Length and Value fields) | |
723 | * MUST be a multiple of 4 bytes. If the length of the chunk is not a | |
724 | * multiple of 4 bytes, the sender MUST pad the chunk with all zero | |
725 | * bytes and this padding is not included in the chunk length field. | |
726 | * The sender should never pad with more than 3 bytes. The receiver | |
727 | * MUST ignore the padding bytes. | |
728 | */ | |
729 | len = ntohs(chunk->chunk_hdr->length); | |
730 | padding = WORD_ROUND(len) - len; | |
731 | ||
732 | /* Fixup cloned skb with just this chunks data. */ | |
733 | skb_trim(skb, chunk->chunk_end - padding - skb->data); | |
734 | ||
735 | /* Embed the event fields inside the cloned skb. */ | |
736 | event = sctp_skb2event(skb); | |
737 | ||
331c4ee7 VY |
738 | /* Initialize event with flags 0 and correct length |
739 | * Since this is a clone of the original skb, only account for | |
740 | * the data of this chunk as other chunks will be accounted separately. | |
741 | */ | |
742 | sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff)); | |
1da177e4 LT |
743 | |
744 | sctp_ulpevent_receive_data(event, asoc); | |
745 | ||
746 | event->stream = ntohs(chunk->subh.data_hdr->stream); | |
747 | event->ssn = ntohs(chunk->subh.data_hdr->ssn); | |
748 | event->ppid = chunk->subh.data_hdr->ppid; | |
749 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
eaa5c54d | 750 | event->flags |= SCTP_UNORDERED; |
1da177e4 LT |
751 | event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
752 | } | |
753 | event->tsn = ntohl(chunk->subh.data_hdr->tsn); | |
754 | event->msg_flags |= chunk->chunk_hdr->flags; | |
755 | event->iif = sctp_chunk_iif(chunk); | |
756 | ||
1da177e4 | 757 | return event; |
8e1ee18c VY |
758 | |
759 | fail_mark: | |
760 | kfree_skb(skb); | |
761 | fail: | |
762 | return NULL; | |
1da177e4 LT |
763 | } |
764 | ||
765 | /* Create a partial delivery related event. | |
766 | * | |
767 | * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT | |
768 | * | |
769 | * When a receiver is engaged in a partial delivery of a | |
770 | * message this notification will be used to indicate | |
771 | * various events. | |
772 | */ | |
773 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( | |
3182cd84 | 774 | const struct sctp_association *asoc, __u32 indication, |
dd0fc66f | 775 | gfp_t gfp) |
1da177e4 LT |
776 | { |
777 | struct sctp_ulpevent *event; | |
778 | struct sctp_pdapi_event *pd; | |
779 | struct sk_buff *skb; | |
780 | ||
781 | event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event), | |
782 | MSG_NOTIFICATION, gfp); | |
783 | if (!event) | |
784 | goto fail; | |
785 | ||
786 | skb = sctp_event2skb(event); | |
787 | pd = (struct sctp_pdapi_event *) | |
788 | skb_put(skb, sizeof(struct sctp_pdapi_event)); | |
789 | ||
790 | /* pdapi_type | |
791 | * It should be SCTP_PARTIAL_DELIVERY_EVENT | |
792 | * | |
793 | * pdapi_flags: 16 bits (unsigned integer) | |
794 | * Currently unused. | |
795 | */ | |
796 | pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; | |
797 | pd->pdapi_flags = 0; | |
798 | ||
799 | /* pdapi_length: 32 bits (unsigned integer) | |
800 | * | |
801 | * This field is the total length of the notification data, including | |
802 | * the notification header. It will generally be sizeof (struct | |
803 | * sctp_pdapi_event). | |
804 | */ | |
805 | pd->pdapi_length = sizeof(struct sctp_pdapi_event); | |
806 | ||
d808ad9a | 807 | /* pdapi_indication: 32 bits (unsigned integer) |
1da177e4 LT |
808 | * |
809 | * This field holds the indication being sent to the application. | |
810 | */ | |
811 | pd->pdapi_indication = indication; | |
812 | ||
813 | /* pdapi_assoc_id: sizeof (sctp_assoc_t) | |
814 | * | |
815 | * The association id field, holds the identifier for the association. | |
816 | */ | |
817 | sctp_ulpevent_set_owner(event, asoc); | |
818 | pd->pdapi_assoc_id = sctp_assoc2id(asoc); | |
819 | ||
820 | return event; | |
821 | fail: | |
822 | return NULL; | |
823 | } | |
824 | ||
65b07e5d VY |
825 | struct sctp_ulpevent *sctp_ulpevent_make_authkey( |
826 | const struct sctp_association *asoc, __u16 key_id, | |
827 | __u32 indication, gfp_t gfp) | |
828 | { | |
829 | struct sctp_ulpevent *event; | |
830 | struct sctp_authkey_event *ak; | |
831 | struct sk_buff *skb; | |
832 | ||
833 | event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event), | |
834 | MSG_NOTIFICATION, gfp); | |
835 | if (!event) | |
836 | goto fail; | |
837 | ||
838 | skb = sctp_event2skb(event); | |
839 | ak = (struct sctp_authkey_event *) | |
840 | skb_put(skb, sizeof(struct sctp_authkey_event)); | |
841 | ||
ee916fd0 | 842 | ak->auth_type = SCTP_AUTHENTICATION_EVENT; |
65b07e5d VY |
843 | ak->auth_flags = 0; |
844 | ak->auth_length = sizeof(struct sctp_authkey_event); | |
845 | ||
846 | ak->auth_keynumber = key_id; | |
847 | ak->auth_altkeynumber = 0; | |
848 | ak->auth_indication = indication; | |
849 | ||
850 | /* | |
851 | * The association id field, holds the identifier for the association. | |
852 | */ | |
853 | sctp_ulpevent_set_owner(event, asoc); | |
854 | ak->auth_assoc_id = sctp_assoc2id(asoc); | |
855 | ||
856 | return event; | |
857 | fail: | |
858 | return NULL; | |
859 | } | |
860 | ||
e1cdd553 WY |
861 | /* |
862 | * Socket Extensions for SCTP | |
863 | * 6.3.10. SCTP_SENDER_DRY_EVENT | |
864 | */ | |
865 | struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event( | |
866 | const struct sctp_association *asoc, gfp_t gfp) | |
867 | { | |
868 | struct sctp_ulpevent *event; | |
869 | struct sctp_sender_dry_event *sdry; | |
870 | struct sk_buff *skb; | |
871 | ||
872 | event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event), | |
873 | MSG_NOTIFICATION, gfp); | |
874 | if (!event) | |
875 | return NULL; | |
876 | ||
877 | skb = sctp_event2skb(event); | |
878 | sdry = (struct sctp_sender_dry_event *) | |
879 | skb_put(skb, sizeof(struct sctp_sender_dry_event)); | |
880 | ||
881 | sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT; | |
882 | sdry->sender_dry_flags = 0; | |
883 | sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event); | |
884 | sctp_ulpevent_set_owner(event, asoc); | |
885 | sdry->sender_dry_assoc_id = sctp_assoc2id(asoc); | |
886 | ||
887 | return event; | |
888 | } | |
65b07e5d | 889 | |
1da177e4 LT |
890 | /* Return the notification type, assuming this is a notification |
891 | * event. | |
892 | */ | |
893 | __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) | |
894 | { | |
895 | union sctp_notification *notification; | |
896 | struct sk_buff *skb; | |
897 | ||
ab38fb04 | 898 | skb = sctp_event2skb(event); |
1da177e4 LT |
899 | notification = (union sctp_notification *) skb->data; |
900 | return notification->sn_header.sn_type; | |
901 | } | |
902 | ||
903 | /* Copy out the sndrcvinfo into a msghdr. */ | |
904 | void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, | |
905 | struct msghdr *msghdr) | |
906 | { | |
907 | struct sctp_sndrcvinfo sinfo; | |
908 | ||
909 | if (sctp_ulpevent_is_notification(event)) | |
910 | return; | |
911 | ||
912 | /* Sockets API Extensions for SCTP | |
d808ad9a YH |
913 | * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
914 | * | |
915 | * sinfo_stream: 16 bits (unsigned integer) | |
916 | * | |
917 | * For recvmsg() the SCTP stack places the message's stream number in | |
918 | * this value. | |
919 | */ | |
1da177e4 LT |
920 | sinfo.sinfo_stream = event->stream; |
921 | /* sinfo_ssn: 16 bits (unsigned integer) | |
922 | * | |
923 | * For recvmsg() this value contains the stream sequence number that | |
924 | * the remote endpoint placed in the DATA chunk. For fragmented | |
925 | * messages this is the same number for all deliveries of the message | |
926 | * (if more than one recvmsg() is needed to read the message). | |
927 | */ | |
928 | sinfo.sinfo_ssn = event->ssn; | |
929 | /* sinfo_ppid: 32 bits (unsigned integer) | |
930 | * | |
931 | * In recvmsg() this value is | |
932 | * the same information that was passed by the upper layer in the peer | |
933 | * application. Please note that byte order issues are NOT accounted | |
934 | * for and this information is passed opaquely by the SCTP stack from | |
935 | * one end to the other. | |
936 | */ | |
937 | sinfo.sinfo_ppid = event->ppid; | |
938 | /* sinfo_flags: 16 bits (unsigned integer) | |
939 | * | |
940 | * This field may contain any of the following flags and is composed of | |
941 | * a bitwise OR of these values. | |
942 | * | |
943 | * recvmsg() flags: | |
944 | * | |
eaa5c54d | 945 | * SCTP_UNORDERED - This flag is present when the message was sent |
1da177e4 LT |
946 | * non-ordered. |
947 | */ | |
948 | sinfo.sinfo_flags = event->flags; | |
949 | /* sinfo_tsn: 32 bit (unsigned integer) | |
950 | * | |
d808ad9a | 951 | * For the receiving side, this field holds a TSN that was |
1da177e4 LT |
952 | * assigned to one of the SCTP Data Chunks. |
953 | */ | |
954 | sinfo.sinfo_tsn = event->tsn; | |
955 | /* sinfo_cumtsn: 32 bit (unsigned integer) | |
956 | * | |
957 | * This field will hold the current cumulative TSN as | |
958 | * known by the underlying SCTP layer. Note this field is | |
959 | * ignored when sending and only valid for a receive | |
eaa5c54d | 960 | * operation when sinfo_flags are set to SCTP_UNORDERED. |
1da177e4 LT |
961 | */ |
962 | sinfo.sinfo_cumtsn = event->cumtsn; | |
963 | /* sinfo_assoc_id: sizeof (sctp_assoc_t) | |
964 | * | |
965 | * The association handle field, sinfo_assoc_id, holds the identifier | |
966 | * for the association announced in the COMMUNICATION_UP notification. | |
967 | * All notifications for a given association have the same identifier. | |
968 | * Ignored for one-to-one style sockets. | |
969 | */ | |
970 | sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); | |
971 | ||
6ab792f5 ISJ |
972 | /* context value that is set via SCTP_CONTEXT socket option. */ |
973 | sinfo.sinfo_context = event->asoc->default_rcv_context; | |
974 | ||
1da177e4 | 975 | /* These fields are not used while receiving. */ |
1da177e4 LT |
976 | sinfo.sinfo_timetolive = 0; |
977 | ||
978 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, | |
979 | sizeof(struct sctp_sndrcvinfo), (void *)&sinfo); | |
980 | } | |
981 | ||
982 | /* Do accounting for bytes received and hold a reference to the association | |
983 | * for each skb. | |
984 | */ | |
985 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
986 | struct sctp_association *asoc) | |
987 | { | |
988 | struct sk_buff *skb, *frag; | |
989 | ||
990 | skb = sctp_event2skb(event); | |
991 | /* Set the owner and charge rwnd for bytes received. */ | |
992 | sctp_ulpevent_set_owner(event, asoc); | |
993 | sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); | |
994 | ||
995 | if (!skb->data_len) | |
996 | return; | |
997 | ||
998 | /* Note: Not clearing the entire event struct as this is just a | |
999 | * fragment of the real event. However, we still need to do rwnd | |
1000 | * accounting. | |
1001 | * In general, the skb passed from IP can have only 1 level of | |
d808ad9a | 1002 | * fragments. But we allow multiple levels of fragments. |
1da177e4 | 1003 | */ |
1b003be3 | 1004 | skb_walk_frags(skb, frag) |
1da177e4 | 1005 | sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | /* Do accounting for bytes just read by user and release the references to | |
1009 | * the association. | |
d808ad9a | 1010 | */ |
1da177e4 LT |
1011 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
1012 | { | |
1013 | struct sk_buff *skb, *frag; | |
d7c2c9e3 | 1014 | unsigned int len; |
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: | |
1039 | sctp_assoc_rwnd_increase(event->asoc, len); | |
1040 | sctp_ulpevent_release_owner(event); | |
1041 | } | |
1042 | ||
1043 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) | |
1044 | { | |
1045 | struct sk_buff *skb, *frag; | |
1046 | ||
1047 | skb = sctp_event2skb(event); | |
1da177e4 LT |
1048 | |
1049 | if (!skb->data_len) | |
1050 | goto done; | |
1051 | ||
1052 | /* Don't forget the fragments. */ | |
1b003be3 | 1053 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
1054 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1055 | * skb's with only 1 level of fragments, SCTP reassembly can | |
1056 | * increase the levels. | |
1057 | */ | |
d7c2c9e3 | 1058 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
1da177e4 LT |
1059 | } |
1060 | ||
1061 | done: | |
1062 | sctp_ulpevent_release_owner(event); | |
1063 | } | |
1064 | ||
1065 | /* Free a ulpevent that has an owner. It includes releasing the reference | |
1066 | * to the owner, updating the rwnd in case of a DATA event and freeing the | |
1067 | * skb. | |
1da177e4 LT |
1068 | */ |
1069 | void sctp_ulpevent_free(struct sctp_ulpevent *event) | |
1070 | { | |
1071 | if (sctp_ulpevent_is_notification(event)) | |
1072 | sctp_ulpevent_release_owner(event); | |
1073 | else | |
1074 | sctp_ulpevent_release_data(event); | |
1075 | ||
1076 | kfree_skb(sctp_event2skb(event)); | |
1077 | } | |
1078 | ||
1079 | /* Purge the skb lists holding ulpevents. */ | |
cd4fcc70 | 1080 | unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
1da177e4 LT |
1081 | { |
1082 | struct sk_buff *skb; | |
cd4fcc70 TG |
1083 | unsigned int data_unread = 0; |
1084 | ||
1085 | while ((skb = skb_dequeue(list)) != NULL) { | |
1086 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
1087 | ||
1088 | if (!sctp_ulpevent_is_notification(event)) | |
1089 | data_unread += skb->len; | |
1090 | ||
1091 | sctp_ulpevent_free(event); | |
1092 | } | |
1093 | ||
1094 | return data_unread; | |
1da177e4 | 1095 | } |