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1da177e4 LT |
1 | /* SCTP kernel reference Implementation |
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). | |
11 | * The SCTP reference implementation is free software; | |
12 | * you can redistribute it and/or modify it under the terms of | |
13 | * the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2, or (at your option) | |
15 | * any later version. | |
16 | * | |
17 | * The SCTP reference implementation is distributed in the hope that it | |
18 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
19 | * ************************ | |
20 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
21 | * See the GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with GNU CC; see the file COPYING. If not, write to | |
25 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
26 | * Boston, MA 02111-1307, USA. | |
27 | * | |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
30 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
31 | * | |
32 | * Or submit a bug report through the following website: | |
33 | * http://www.sf.net/projects/lksctp | |
34 | * | |
35 | * Written or modified by: | |
36 | * Jon Grimm <jgrimm@us.ibm.com> | |
37 | * La Monte H.P. Yarroll <piggy@acm.org> | |
38 | * Ardelle Fan <ardelle.fan@intel.com> | |
39 | * Sridhar Samudrala <sri@us.ibm.com> | |
40 | * | |
41 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
42 | * be incorporated into the next SCTP release. | |
43 | */ | |
44 | ||
45 | #include <linux/types.h> | |
46 | #include <linux/skbuff.h> | |
47 | #include <net/sctp/structs.h> | |
48 | #include <net/sctp/sctp.h> | |
49 | #include <net/sctp/sm.h> | |
50 | ||
51 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
52 | struct sctp_association *asoc); | |
53 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event); | |
d7c2c9e3 TF |
54 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event); |
55 | ||
1da177e4 | 56 | |
1da177e4 | 57 | /* Initialize an ULP event from an given skb. */ |
331c4ee7 VY |
58 | SCTP_STATIC void sctp_ulpevent_init(struct sctp_ulpevent *event, |
59 | int msg_flags, | |
60 | unsigned int len) | |
1da177e4 LT |
61 | { |
62 | memset(event, 0, sizeof(struct sctp_ulpevent)); | |
63 | event->msg_flags = msg_flags; | |
331c4ee7 | 64 | event->rmem_len = len; |
1da177e4 LT |
65 | } |
66 | ||
67 | /* Create a new sctp_ulpevent. */ | |
68 | SCTP_STATIC struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags, | |
dd0fc66f | 69 | gfp_t gfp) |
1da177e4 LT |
70 | { |
71 | struct sctp_ulpevent *event; | |
72 | struct sk_buff *skb; | |
73 | ||
74 | skb = alloc_skb(size, gfp); | |
75 | if (!skb) | |
76 | goto fail; | |
77 | ||
78 | event = sctp_skb2event(skb); | |
331c4ee7 | 79 | sctp_ulpevent_init(event, msg_flags, skb->truesize); |
1da177e4 LT |
80 | |
81 | return event; | |
82 | ||
83 | fail: | |
84 | return NULL; | |
85 | } | |
86 | ||
87 | /* Is this a MSG_NOTIFICATION? */ | |
88 | int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event) | |
89 | { | |
90 | return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION); | |
91 | } | |
92 | ||
93 | /* Hold the association in case the msg_name needs read out of | |
94 | * the association. | |
95 | */ | |
96 | static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event, | |
97 | const struct sctp_association *asoc) | |
98 | { | |
99 | struct sk_buff *skb; | |
100 | ||
101 | /* Cast away the const, as we are just wanting to | |
102 | * bump the reference count. | |
103 | */ | |
104 | sctp_association_hold((struct sctp_association *)asoc); | |
105 | skb = sctp_event2skb(event); | |
1da177e4 | 106 | event->asoc = (struct sctp_association *)asoc; |
331c4ee7 VY |
107 | atomic_add(event->rmem_len, &event->asoc->rmem_alloc); |
108 | sctp_skb_set_owner_r(skb, asoc->base.sk); | |
1da177e4 LT |
109 | } |
110 | ||
111 | /* A simple destructor to give up the reference to the association. */ | |
112 | static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) | |
113 | { | |
049b3ff5 | 114 | struct sctp_association *asoc = event->asoc; |
049b3ff5 | 115 | |
331c4ee7 | 116 | atomic_sub(event->rmem_len, &asoc->rmem_alloc); |
049b3ff5 | 117 | sctp_association_put(asoc); |
1da177e4 LT |
118 | } |
119 | ||
120 | /* Create and initialize an SCTP_ASSOC_CHANGE event. | |
121 | * | |
122 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
123 | * | |
124 | * Communication notifications inform the ULP that an SCTP association | |
125 | * has either begun or ended. The identifier for a new association is | |
126 | * provided by this notification. | |
127 | * | |
128 | * Note: There is no field checking here. If a field is unused it will be | |
129 | * zero'd out. | |
130 | */ | |
131 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( | |
132 | const struct sctp_association *asoc, | |
133 | __u16 flags, __u16 state, __u16 error, __u16 outbound, | |
a5a35e76 | 134 | __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp) |
1da177e4 LT |
135 | { |
136 | struct sctp_ulpevent *event; | |
137 | struct sctp_assoc_change *sac; | |
138 | struct sk_buff *skb; | |
139 | ||
a5a35e76 VY |
140 | /* If the lower layer passed in the chunk, it will be |
141 | * an ABORT, so we need to include it in the sac_info. | |
142 | */ | |
143 | if (chunk) { | |
144 | /* sctp_inqu_pop() has allready pulled off the chunk | |
145 | * header. We need to put it back temporarily | |
146 | */ | |
147 | skb_push(chunk->skb, sizeof(sctp_chunkhdr_t)); | |
148 | ||
149 | /* Copy the chunk data to a new skb and reserve enough | |
150 | * head room to use as notification. | |
151 | */ | |
152 | skb = skb_copy_expand(chunk->skb, | |
153 | sizeof(struct sctp_assoc_change), 0, gfp); | |
154 | ||
155 | if (!skb) | |
156 | goto fail; | |
157 | ||
158 | /* put back the chunk header now that we have a copy */ | |
159 | skb_pull(chunk->skb, sizeof(sctp_chunkhdr_t)); | |
160 | ||
161 | /* Embed the event fields inside the cloned skb. */ | |
162 | event = sctp_skb2event(skb); | |
163 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); | |
164 | ||
165 | /* Include the notification structure */ | |
166 | sac = (struct sctp_assoc_change *) | |
167 | skb_push(skb, sizeof(struct sctp_assoc_change)); | |
168 | ||
169 | /* Trim the buffer to the right length. */ | |
170 | skb_trim(skb, sizeof(struct sctp_assoc_change) + | |
171 | ntohs(chunk->chunk_hdr->length)); | |
172 | } else { | |
173 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change), | |
1da177e4 | 174 | MSG_NOTIFICATION, gfp); |
a5a35e76 VY |
175 | if (!event) |
176 | goto fail; | |
177 | ||
178 | skb = sctp_event2skb(event); | |
179 | sac = (struct sctp_assoc_change *) skb_put(skb, | |
180 | sizeof(struct sctp_assoc_change)); | |
181 | } | |
1da177e4 LT |
182 | |
183 | /* Socket Extensions for SCTP | |
184 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
185 | * | |
186 | * sac_type: | |
187 | * It should be SCTP_ASSOC_CHANGE. | |
188 | */ | |
189 | sac->sac_type = SCTP_ASSOC_CHANGE; | |
190 | ||
191 | /* Socket Extensions for SCTP | |
192 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
193 | * | |
194 | * sac_state: 32 bits (signed integer) | |
195 | * This field holds one of a number of values that communicate the | |
196 | * event that happened to the association. | |
197 | */ | |
198 | sac->sac_state = state; | |
199 | ||
200 | /* Socket Extensions for SCTP | |
201 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
202 | * | |
203 | * sac_flags: 16 bits (unsigned integer) | |
204 | * Currently unused. | |
205 | */ | |
206 | sac->sac_flags = 0; | |
207 | ||
208 | /* Socket Extensions for SCTP | |
209 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
210 | * | |
211 | * sac_length: sizeof (__u32) | |
212 | * This field is the total length of the notification data, including | |
213 | * the notification header. | |
214 | */ | |
215 | sac->sac_length = sizeof(struct sctp_assoc_change); | |
216 | ||
217 | /* Socket Extensions for SCTP | |
218 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
219 | * | |
220 | * sac_error: 32 bits (signed integer) | |
221 | * | |
222 | * If the state was reached due to a error condition (e.g. | |
223 | * COMMUNICATION_LOST) any relevant error information is available in | |
224 | * this field. This corresponds to the protocol error codes defined in | |
225 | * [SCTP]. | |
226 | */ | |
227 | sac->sac_error = error; | |
228 | ||
229 | /* Socket Extensions for SCTP | |
230 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
231 | * | |
232 | * sac_outbound_streams: 16 bits (unsigned integer) | |
233 | * sac_inbound_streams: 16 bits (unsigned integer) | |
234 | * | |
235 | * The maximum number of streams allowed in each direction are | |
236 | * available in sac_outbound_streams and sac_inbound streams. | |
237 | */ | |
238 | sac->sac_outbound_streams = outbound; | |
239 | sac->sac_inbound_streams = inbound; | |
240 | ||
241 | /* Socket Extensions for SCTP | |
242 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
243 | * | |
244 | * sac_assoc_id: sizeof (sctp_assoc_t) | |
245 | * | |
246 | * The association id field, holds the identifier for the association. | |
247 | * All notifications for a given association have the same association | |
248 | * identifier. For TCP style socket, this field is ignored. | |
249 | */ | |
250 | sctp_ulpevent_set_owner(event, asoc); | |
251 | sac->sac_assoc_id = sctp_assoc2id(asoc); | |
252 | ||
253 | return event; | |
254 | ||
255 | fail: | |
256 | return NULL; | |
257 | } | |
258 | ||
259 | /* Create and initialize an SCTP_PEER_ADDR_CHANGE event. | |
260 | * | |
261 | * Socket Extensions for SCTP - draft-01 | |
262 | * 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
263 | * | |
264 | * When a destination address on a multi-homed peer encounters a change | |
265 | * an interface details event is sent. | |
266 | */ | |
267 | struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change( | |
268 | const struct sctp_association *asoc, | |
269 | const struct sockaddr_storage *aaddr, | |
dd0fc66f | 270 | int flags, int state, int error, gfp_t gfp) |
1da177e4 LT |
271 | { |
272 | struct sctp_ulpevent *event; | |
273 | struct sctp_paddr_change *spc; | |
274 | struct sk_buff *skb; | |
275 | ||
276 | event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change), | |
277 | MSG_NOTIFICATION, gfp); | |
278 | if (!event) | |
279 | goto fail; | |
280 | ||
281 | skb = sctp_event2skb(event); | |
282 | spc = (struct sctp_paddr_change *) | |
283 | skb_put(skb, sizeof(struct sctp_paddr_change)); | |
284 | ||
285 | /* Sockets API Extensions for SCTP | |
286 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
287 | * | |
288 | * spc_type: | |
289 | * | |
290 | * It should be SCTP_PEER_ADDR_CHANGE. | |
291 | */ | |
292 | spc->spc_type = SCTP_PEER_ADDR_CHANGE; | |
293 | ||
294 | /* Sockets API Extensions for SCTP | |
295 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
296 | * | |
297 | * spc_length: sizeof (__u32) | |
298 | * | |
299 | * This field is the total length of the notification data, including | |
300 | * the notification header. | |
301 | */ | |
302 | spc->spc_length = sizeof(struct sctp_paddr_change); | |
303 | ||
304 | /* Sockets API Extensions for SCTP | |
305 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
306 | * | |
307 | * spc_flags: 16 bits (unsigned integer) | |
308 | * Currently unused. | |
309 | */ | |
310 | spc->spc_flags = 0; | |
311 | ||
312 | /* Sockets API Extensions for SCTP | |
313 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
314 | * | |
315 | * spc_state: 32 bits (signed integer) | |
316 | * | |
317 | * This field holds one of a number of values that communicate the | |
318 | * event that happened to the address. | |
319 | */ | |
320 | spc->spc_state = state; | |
321 | ||
322 | /* Sockets API Extensions for SCTP | |
323 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
324 | * | |
325 | * spc_error: 32 bits (signed integer) | |
326 | * | |
327 | * If the state was reached due to any error condition (e.g. | |
328 | * ADDRESS_UNREACHABLE) any relevant error information is available in | |
329 | * this field. | |
330 | */ | |
331 | spc->spc_error = error; | |
332 | ||
333 | /* Socket Extensions for SCTP | |
334 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
335 | * | |
336 | * spc_assoc_id: sizeof (sctp_assoc_t) | |
337 | * | |
338 | * The association id field, holds the identifier for the association. | |
339 | * All notifications for a given association have the same association | |
340 | * identifier. For TCP style socket, this field is ignored. | |
341 | */ | |
342 | sctp_ulpevent_set_owner(event, asoc); | |
343 | spc->spc_assoc_id = sctp_assoc2id(asoc); | |
344 | ||
345 | /* Sockets API Extensions for SCTP | |
346 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
347 | * | |
348 | * spc_aaddr: sizeof (struct sockaddr_storage) | |
349 | * | |
350 | * The affected address field, holds the remote peer's address that is | |
351 | * encountering the change of state. | |
352 | */ | |
353 | memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage)); | |
354 | ||
355 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
356 | sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map( | |
357 | sctp_sk(asoc->base.sk), | |
358 | (union sctp_addr *)&spc->spc_aaddr); | |
359 | ||
360 | return event; | |
361 | ||
362 | fail: | |
363 | return NULL; | |
364 | } | |
365 | ||
366 | /* Create and initialize an SCTP_REMOTE_ERROR notification. | |
367 | * | |
368 | * Note: This assumes that the chunk->skb->data already points to the | |
369 | * operation error payload. | |
370 | * | |
371 | * Socket Extensions for SCTP - draft-01 | |
372 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
373 | * | |
374 | * A remote peer may send an Operational Error message to its peer. | |
375 | * This message indicates a variety of error conditions on an | |
376 | * association. The entire error TLV as it appears on the wire is | |
377 | * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP | |
378 | * specification [SCTP] and any extensions for a list of possible | |
379 | * error formats. | |
380 | */ | |
381 | struct sctp_ulpevent *sctp_ulpevent_make_remote_error( | |
382 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 383 | __u16 flags, gfp_t gfp) |
1da177e4 LT |
384 | { |
385 | struct sctp_ulpevent *event; | |
386 | struct sctp_remote_error *sre; | |
387 | struct sk_buff *skb; | |
388 | sctp_errhdr_t *ch; | |
9f81bcd9 | 389 | __be16 cause; |
1da177e4 LT |
390 | int elen; |
391 | ||
392 | ch = (sctp_errhdr_t *)(chunk->skb->data); | |
393 | cause = ch->cause; | |
394 | elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t); | |
395 | ||
396 | /* Pull off the ERROR header. */ | |
397 | skb_pull(chunk->skb, sizeof(sctp_errhdr_t)); | |
398 | ||
399 | /* Copy the skb to a new skb with room for us to prepend | |
400 | * notification with. | |
401 | */ | |
402 | skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error), | |
403 | 0, gfp); | |
404 | ||
405 | /* Pull off the rest of the cause TLV from the chunk. */ | |
406 | skb_pull(chunk->skb, elen); | |
407 | if (!skb) | |
408 | goto fail; | |
409 | ||
410 | /* Embed the event fields inside the cloned skb. */ | |
411 | event = sctp_skb2event(skb); | |
331c4ee7 | 412 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 LT |
413 | |
414 | sre = (struct sctp_remote_error *) | |
415 | skb_push(skb, sizeof(struct sctp_remote_error)); | |
416 | ||
417 | /* Trim the buffer to the right length. */ | |
418 | skb_trim(skb, sizeof(struct sctp_remote_error) + elen); | |
419 | ||
420 | /* Socket Extensions for SCTP | |
421 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
422 | * | |
423 | * sre_type: | |
424 | * It should be SCTP_REMOTE_ERROR. | |
425 | */ | |
426 | sre->sre_type = SCTP_REMOTE_ERROR; | |
427 | ||
428 | /* | |
429 | * Socket Extensions for SCTP | |
430 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
431 | * | |
432 | * sre_flags: 16 bits (unsigned integer) | |
433 | * Currently unused. | |
434 | */ | |
435 | sre->sre_flags = 0; | |
436 | ||
437 | /* Socket Extensions for SCTP | |
438 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
439 | * | |
440 | * sre_length: sizeof (__u32) | |
441 | * | |
442 | * This field is the total length of the notification data, | |
443 | * including the notification header. | |
444 | */ | |
445 | sre->sre_length = skb->len; | |
446 | ||
447 | /* Socket Extensions for SCTP | |
448 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
449 | * | |
450 | * sre_error: 16 bits (unsigned integer) | |
451 | * This value represents one of the Operational Error causes defined in | |
452 | * the SCTP specification, in network byte order. | |
453 | */ | |
454 | sre->sre_error = cause; | |
455 | ||
456 | /* Socket Extensions for SCTP | |
457 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
458 | * | |
459 | * sre_assoc_id: sizeof (sctp_assoc_t) | |
460 | * | |
461 | * The association id field, holds the identifier for the association. | |
462 | * All notifications for a given association have the same association | |
463 | * identifier. For TCP style socket, this field is ignored. | |
464 | */ | |
465 | sctp_ulpevent_set_owner(event, asoc); | |
466 | sre->sre_assoc_id = sctp_assoc2id(asoc); | |
467 | ||
468 | return event; | |
469 | ||
470 | fail: | |
471 | return NULL; | |
472 | } | |
473 | ||
474 | /* Create and initialize a SCTP_SEND_FAILED notification. | |
475 | * | |
476 | * Socket Extensions for SCTP - draft-01 | |
477 | * 5.3.1.4 SCTP_SEND_FAILED | |
478 | */ | |
479 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( | |
480 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 481 | __u16 flags, __u32 error, gfp_t gfp) |
1da177e4 LT |
482 | { |
483 | struct sctp_ulpevent *event; | |
484 | struct sctp_send_failed *ssf; | |
485 | struct sk_buff *skb; | |
486 | ||
487 | /* Pull off any padding. */ | |
488 | int len = ntohs(chunk->chunk_hdr->length); | |
489 | ||
490 | /* Make skb with more room so we can prepend notification. */ | |
491 | skb = skb_copy_expand(chunk->skb, | |
492 | sizeof(struct sctp_send_failed), /* headroom */ | |
493 | 0, /* tailroom */ | |
494 | gfp); | |
495 | if (!skb) | |
496 | goto fail; | |
497 | ||
498 | /* Pull off the common chunk header and DATA header. */ | |
499 | skb_pull(skb, sizeof(struct sctp_data_chunk)); | |
500 | len -= sizeof(struct sctp_data_chunk); | |
501 | ||
502 | /* Embed the event fields inside the cloned skb. */ | |
503 | event = sctp_skb2event(skb); | |
331c4ee7 | 504 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 LT |
505 | |
506 | ssf = (struct sctp_send_failed *) | |
507 | skb_push(skb, sizeof(struct sctp_send_failed)); | |
508 | ||
509 | /* Socket Extensions for SCTP | |
510 | * 5.3.1.4 SCTP_SEND_FAILED | |
511 | * | |
512 | * ssf_type: | |
513 | * It should be SCTP_SEND_FAILED. | |
514 | */ | |
515 | ssf->ssf_type = SCTP_SEND_FAILED; | |
516 | ||
517 | /* Socket Extensions for SCTP | |
518 | * 5.3.1.4 SCTP_SEND_FAILED | |
519 | * | |
520 | * ssf_flags: 16 bits (unsigned integer) | |
521 | * The flag value will take one of the following values | |
522 | * | |
523 | * SCTP_DATA_UNSENT - Indicates that the data was never put on | |
524 | * the wire. | |
525 | * | |
526 | * SCTP_DATA_SENT - Indicates that the data was put on the wire. | |
527 | * Note that this does not necessarily mean that the | |
528 | * data was (or was not) successfully delivered. | |
529 | */ | |
530 | ssf->ssf_flags = flags; | |
531 | ||
532 | /* Socket Extensions for SCTP | |
533 | * 5.3.1.4 SCTP_SEND_FAILED | |
534 | * | |
535 | * ssf_length: sizeof (__u32) | |
536 | * This field is the total length of the notification data, including | |
537 | * the notification header. | |
538 | */ | |
539 | ssf->ssf_length = sizeof(struct sctp_send_failed) + len; | |
540 | skb_trim(skb, ssf->ssf_length); | |
541 | ||
542 | /* Socket Extensions for SCTP | |
543 | * 5.3.1.4 SCTP_SEND_FAILED | |
544 | * | |
545 | * ssf_error: 16 bits (unsigned integer) | |
546 | * This value represents the reason why the send failed, and if set, | |
547 | * will be a SCTP protocol error code as defined in [SCTP] section | |
548 | * 3.3.10. | |
549 | */ | |
550 | ssf->ssf_error = error; | |
551 | ||
552 | /* Socket Extensions for SCTP | |
553 | * 5.3.1.4 SCTP_SEND_FAILED | |
554 | * | |
555 | * ssf_info: sizeof (struct sctp_sndrcvinfo) | |
556 | * The original send information associated with the undelivered | |
557 | * message. | |
558 | */ | |
559 | memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); | |
560 | ||
561 | /* Per TSVWG discussion with Randy. Allow the application to | |
562 | * ressemble a fragmented message. | |
563 | */ | |
564 | ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; | |
565 | ||
566 | /* Socket Extensions for SCTP | |
567 | * 5.3.1.4 SCTP_SEND_FAILED | |
568 | * | |
569 | * ssf_assoc_id: sizeof (sctp_assoc_t) | |
570 | * The association id field, sf_assoc_id, holds the identifier for the | |
571 | * association. All notifications for a given association have the | |
572 | * same association identifier. For TCP style socket, this field is | |
573 | * ignored. | |
574 | */ | |
575 | sctp_ulpevent_set_owner(event, asoc); | |
576 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); | |
577 | return event; | |
578 | ||
579 | fail: | |
580 | return NULL; | |
581 | } | |
582 | ||
583 | /* Create and initialize a SCTP_SHUTDOWN_EVENT notification. | |
584 | * | |
585 | * Socket Extensions for SCTP - draft-01 | |
586 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
587 | */ | |
588 | struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( | |
589 | const struct sctp_association *asoc, | |
dd0fc66f | 590 | __u16 flags, gfp_t gfp) |
1da177e4 LT |
591 | { |
592 | struct sctp_ulpevent *event; | |
593 | struct sctp_shutdown_event *sse; | |
594 | struct sk_buff *skb; | |
595 | ||
596 | event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event), | |
597 | MSG_NOTIFICATION, gfp); | |
598 | if (!event) | |
599 | goto fail; | |
600 | ||
601 | skb = sctp_event2skb(event); | |
602 | sse = (struct sctp_shutdown_event *) | |
603 | skb_put(skb, sizeof(struct sctp_shutdown_event)); | |
604 | ||
605 | /* Socket Extensions for SCTP | |
606 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
607 | * | |
608 | * sse_type | |
609 | * It should be SCTP_SHUTDOWN_EVENT | |
610 | */ | |
611 | sse->sse_type = SCTP_SHUTDOWN_EVENT; | |
612 | ||
613 | /* Socket Extensions for SCTP | |
614 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
615 | * | |
616 | * sse_flags: 16 bits (unsigned integer) | |
617 | * Currently unused. | |
618 | */ | |
619 | sse->sse_flags = 0; | |
620 | ||
621 | /* Socket Extensions for SCTP | |
622 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
623 | * | |
624 | * sse_length: sizeof (__u32) | |
625 | * This field is the total length of the notification data, including | |
626 | * the notification header. | |
627 | */ | |
628 | sse->sse_length = sizeof(struct sctp_shutdown_event); | |
629 | ||
630 | /* Socket Extensions for SCTP | |
631 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
632 | * | |
633 | * sse_assoc_id: sizeof (sctp_assoc_t) | |
634 | * The association id field, holds the identifier for the association. | |
635 | * All notifications for a given association have the same association | |
636 | * identifier. For TCP style socket, this field is ignored. | |
637 | */ | |
638 | sctp_ulpevent_set_owner(event, asoc); | |
639 | sse->sse_assoc_id = sctp_assoc2id(asoc); | |
640 | ||
641 | return event; | |
642 | ||
643 | fail: | |
644 | return NULL; | |
645 | } | |
646 | ||
0f3fffd8 | 647 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
1da177e4 LT |
648 | * |
649 | * Socket Extensions for SCTP | |
0f3fffd8 | 650 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
1da177e4 | 651 | */ |
0f3fffd8 | 652 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
dd0fc66f | 653 | const struct sctp_association *asoc, gfp_t gfp) |
1da177e4 LT |
654 | { |
655 | struct sctp_ulpevent *event; | |
0f3fffd8 | 656 | struct sctp_adaptation_event *sai; |
1da177e4 LT |
657 | struct sk_buff *skb; |
658 | ||
0f3fffd8 | 659 | event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event), |
1da177e4 LT |
660 | MSG_NOTIFICATION, gfp); |
661 | if (!event) | |
662 | goto fail; | |
663 | ||
664 | skb = sctp_event2skb(event); | |
0f3fffd8 ISJ |
665 | sai = (struct sctp_adaptation_event *) |
666 | skb_put(skb, sizeof(struct sctp_adaptation_event)); | |
1da177e4 | 667 | |
0f3fffd8 | 668 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
1da177e4 | 669 | sai->sai_flags = 0; |
0f3fffd8 ISJ |
670 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
671 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
672 | sctp_ulpevent_set_owner(event, asoc); |
673 | sai->sai_assoc_id = sctp_assoc2id(asoc); | |
674 | ||
675 | return event; | |
676 | ||
677 | fail: | |
678 | return NULL; | |
679 | } | |
680 | ||
681 | /* A message has been received. Package this message as a notification | |
682 | * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo | |
683 | * even if filtered out later. | |
684 | * | |
685 | * Socket Extensions for SCTP | |
686 | * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) | |
687 | */ | |
688 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, | |
689 | struct sctp_chunk *chunk, | |
dd0fc66f | 690 | gfp_t gfp) |
1da177e4 LT |
691 | { |
692 | struct sctp_ulpevent *event = NULL; | |
693 | struct sk_buff *skb; | |
694 | size_t padding, len; | |
695 | ||
696 | /* Clone the original skb, sharing the data. */ | |
697 | skb = skb_clone(chunk->skb, gfp); | |
698 | if (!skb) | |
699 | goto fail; | |
700 | ||
701 | /* First calculate the padding, so we don't inadvertently | |
702 | * pass up the wrong length to the user. | |
703 | * | |
704 | * RFC 2960 - Section 3.2 Chunk Field Descriptions | |
705 | * | |
706 | * The total length of a chunk(including Type, Length and Value fields) | |
707 | * MUST be a multiple of 4 bytes. If the length of the chunk is not a | |
708 | * multiple of 4 bytes, the sender MUST pad the chunk with all zero | |
709 | * bytes and this padding is not included in the chunk length field. | |
710 | * The sender should never pad with more than 3 bytes. The receiver | |
711 | * MUST ignore the padding bytes. | |
712 | */ | |
713 | len = ntohs(chunk->chunk_hdr->length); | |
714 | padding = WORD_ROUND(len) - len; | |
715 | ||
716 | /* Fixup cloned skb with just this chunks data. */ | |
717 | skb_trim(skb, chunk->chunk_end - padding - skb->data); | |
718 | ||
719 | /* Embed the event fields inside the cloned skb. */ | |
720 | event = sctp_skb2event(skb); | |
721 | ||
331c4ee7 VY |
722 | /* Initialize event with flags 0 and correct length |
723 | * Since this is a clone of the original skb, only account for | |
724 | * the data of this chunk as other chunks will be accounted separately. | |
725 | */ | |
726 | sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff)); | |
1da177e4 LT |
727 | |
728 | sctp_ulpevent_receive_data(event, asoc); | |
729 | ||
730 | event->stream = ntohs(chunk->subh.data_hdr->stream); | |
731 | event->ssn = ntohs(chunk->subh.data_hdr->ssn); | |
732 | event->ppid = chunk->subh.data_hdr->ppid; | |
733 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
eaa5c54d | 734 | event->flags |= SCTP_UNORDERED; |
1da177e4 LT |
735 | event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
736 | } | |
737 | event->tsn = ntohl(chunk->subh.data_hdr->tsn); | |
738 | event->msg_flags |= chunk->chunk_hdr->flags; | |
739 | event->iif = sctp_chunk_iif(chunk); | |
740 | ||
741 | fail: | |
742 | return event; | |
743 | } | |
744 | ||
745 | /* Create a partial delivery related event. | |
746 | * | |
747 | * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT | |
748 | * | |
749 | * When a receiver is engaged in a partial delivery of a | |
750 | * message this notification will be used to indicate | |
751 | * various events. | |
752 | */ | |
753 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( | |
3182cd84 | 754 | const struct sctp_association *asoc, __u32 indication, |
dd0fc66f | 755 | gfp_t gfp) |
1da177e4 LT |
756 | { |
757 | struct sctp_ulpevent *event; | |
758 | struct sctp_pdapi_event *pd; | |
759 | struct sk_buff *skb; | |
760 | ||
761 | event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event), | |
762 | MSG_NOTIFICATION, gfp); | |
763 | if (!event) | |
764 | goto fail; | |
765 | ||
766 | skb = sctp_event2skb(event); | |
767 | pd = (struct sctp_pdapi_event *) | |
768 | skb_put(skb, sizeof(struct sctp_pdapi_event)); | |
769 | ||
770 | /* pdapi_type | |
771 | * It should be SCTP_PARTIAL_DELIVERY_EVENT | |
772 | * | |
773 | * pdapi_flags: 16 bits (unsigned integer) | |
774 | * Currently unused. | |
775 | */ | |
776 | pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; | |
777 | pd->pdapi_flags = 0; | |
778 | ||
779 | /* pdapi_length: 32 bits (unsigned integer) | |
780 | * | |
781 | * This field is the total length of the notification data, including | |
782 | * the notification header. It will generally be sizeof (struct | |
783 | * sctp_pdapi_event). | |
784 | */ | |
785 | pd->pdapi_length = sizeof(struct sctp_pdapi_event); | |
786 | ||
d808ad9a | 787 | /* pdapi_indication: 32 bits (unsigned integer) |
1da177e4 LT |
788 | * |
789 | * This field holds the indication being sent to the application. | |
790 | */ | |
791 | pd->pdapi_indication = indication; | |
792 | ||
793 | /* pdapi_assoc_id: sizeof (sctp_assoc_t) | |
794 | * | |
795 | * The association id field, holds the identifier for the association. | |
796 | */ | |
797 | sctp_ulpevent_set_owner(event, asoc); | |
798 | pd->pdapi_assoc_id = sctp_assoc2id(asoc); | |
799 | ||
800 | return event; | |
801 | fail: | |
802 | return NULL; | |
803 | } | |
804 | ||
805 | /* Return the notification type, assuming this is a notification | |
806 | * event. | |
807 | */ | |
808 | __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) | |
809 | { | |
810 | union sctp_notification *notification; | |
811 | struct sk_buff *skb; | |
812 | ||
813 | skb = sctp_event2skb((struct sctp_ulpevent *)event); | |
814 | notification = (union sctp_notification *) skb->data; | |
815 | return notification->sn_header.sn_type; | |
816 | } | |
817 | ||
818 | /* Copy out the sndrcvinfo into a msghdr. */ | |
819 | void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, | |
820 | struct msghdr *msghdr) | |
821 | { | |
822 | struct sctp_sndrcvinfo sinfo; | |
823 | ||
824 | if (sctp_ulpevent_is_notification(event)) | |
825 | return; | |
826 | ||
827 | /* Sockets API Extensions for SCTP | |
d808ad9a YH |
828 | * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
829 | * | |
830 | * sinfo_stream: 16 bits (unsigned integer) | |
831 | * | |
832 | * For recvmsg() the SCTP stack places the message's stream number in | |
833 | * this value. | |
834 | */ | |
1da177e4 LT |
835 | sinfo.sinfo_stream = event->stream; |
836 | /* sinfo_ssn: 16 bits (unsigned integer) | |
837 | * | |
838 | * For recvmsg() this value contains the stream sequence number that | |
839 | * the remote endpoint placed in the DATA chunk. For fragmented | |
840 | * messages this is the same number for all deliveries of the message | |
841 | * (if more than one recvmsg() is needed to read the message). | |
842 | */ | |
843 | sinfo.sinfo_ssn = event->ssn; | |
844 | /* sinfo_ppid: 32 bits (unsigned integer) | |
845 | * | |
846 | * In recvmsg() this value is | |
847 | * the same information that was passed by the upper layer in the peer | |
848 | * application. Please note that byte order issues are NOT accounted | |
849 | * for and this information is passed opaquely by the SCTP stack from | |
850 | * one end to the other. | |
851 | */ | |
852 | sinfo.sinfo_ppid = event->ppid; | |
853 | /* sinfo_flags: 16 bits (unsigned integer) | |
854 | * | |
855 | * This field may contain any of the following flags and is composed of | |
856 | * a bitwise OR of these values. | |
857 | * | |
858 | * recvmsg() flags: | |
859 | * | |
eaa5c54d | 860 | * SCTP_UNORDERED - This flag is present when the message was sent |
1da177e4 LT |
861 | * non-ordered. |
862 | */ | |
863 | sinfo.sinfo_flags = event->flags; | |
864 | /* sinfo_tsn: 32 bit (unsigned integer) | |
865 | * | |
d808ad9a | 866 | * For the receiving side, this field holds a TSN that was |
1da177e4 LT |
867 | * assigned to one of the SCTP Data Chunks. |
868 | */ | |
869 | sinfo.sinfo_tsn = event->tsn; | |
870 | /* sinfo_cumtsn: 32 bit (unsigned integer) | |
871 | * | |
872 | * This field will hold the current cumulative TSN as | |
873 | * known by the underlying SCTP layer. Note this field is | |
874 | * ignored when sending and only valid for a receive | |
eaa5c54d | 875 | * operation when sinfo_flags are set to SCTP_UNORDERED. |
1da177e4 LT |
876 | */ |
877 | sinfo.sinfo_cumtsn = event->cumtsn; | |
878 | /* sinfo_assoc_id: sizeof (sctp_assoc_t) | |
879 | * | |
880 | * The association handle field, sinfo_assoc_id, holds the identifier | |
881 | * for the association announced in the COMMUNICATION_UP notification. | |
882 | * All notifications for a given association have the same identifier. | |
883 | * Ignored for one-to-one style sockets. | |
884 | */ | |
885 | sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); | |
886 | ||
6ab792f5 ISJ |
887 | /* context value that is set via SCTP_CONTEXT socket option. */ |
888 | sinfo.sinfo_context = event->asoc->default_rcv_context; | |
889 | ||
1da177e4 | 890 | /* These fields are not used while receiving. */ |
1da177e4 LT |
891 | sinfo.sinfo_timetolive = 0; |
892 | ||
893 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, | |
894 | sizeof(struct sctp_sndrcvinfo), (void *)&sinfo); | |
895 | } | |
896 | ||
897 | /* Do accounting for bytes received and hold a reference to the association | |
898 | * for each skb. | |
899 | */ | |
900 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
901 | struct sctp_association *asoc) | |
902 | { | |
903 | struct sk_buff *skb, *frag; | |
904 | ||
905 | skb = sctp_event2skb(event); | |
906 | /* Set the owner and charge rwnd for bytes received. */ | |
907 | sctp_ulpevent_set_owner(event, asoc); | |
908 | sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); | |
909 | ||
910 | if (!skb->data_len) | |
911 | return; | |
912 | ||
913 | /* Note: Not clearing the entire event struct as this is just a | |
914 | * fragment of the real event. However, we still need to do rwnd | |
915 | * accounting. | |
916 | * In general, the skb passed from IP can have only 1 level of | |
d808ad9a | 917 | * fragments. But we allow multiple levels of fragments. |
1da177e4 LT |
918 | */ |
919 | for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { | |
920 | sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); | |
921 | } | |
922 | } | |
923 | ||
924 | /* Do accounting for bytes just read by user and release the references to | |
925 | * the association. | |
d808ad9a | 926 | */ |
1da177e4 LT |
927 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
928 | { | |
929 | struct sk_buff *skb, *frag; | |
d7c2c9e3 | 930 | unsigned int len; |
1da177e4 LT |
931 | |
932 | /* Current stack structures assume that the rcv buffer is | |
933 | * per socket. For UDP style sockets this is not true as | |
934 | * multiple associations may be on a single UDP-style socket. | |
935 | * Use the local private area of the skb to track the owning | |
936 | * association. | |
937 | */ | |
938 | ||
939 | skb = sctp_event2skb(event); | |
d7c2c9e3 TF |
940 | len = skb->len; |
941 | ||
942 | if (!skb->data_len) | |
943 | goto done; | |
944 | ||
945 | /* Don't forget the fragments. */ | |
946 | for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { | |
947 | /* NOTE: skb_shinfos are recursive. Although IP returns | |
948 | * skb's with only 1 level of fragments, SCTP reassembly can | |
949 | * increase the levels. | |
950 | */ | |
951 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); | |
952 | } | |
953 | ||
954 | done: | |
955 | sctp_assoc_rwnd_increase(event->asoc, len); | |
956 | sctp_ulpevent_release_owner(event); | |
957 | } | |
958 | ||
959 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) | |
960 | { | |
961 | struct sk_buff *skb, *frag; | |
962 | ||
963 | skb = sctp_event2skb(event); | |
1da177e4 LT |
964 | |
965 | if (!skb->data_len) | |
966 | goto done; | |
967 | ||
968 | /* Don't forget the fragments. */ | |
969 | for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { | |
970 | /* NOTE: skb_shinfos are recursive. Although IP returns | |
971 | * skb's with only 1 level of fragments, SCTP reassembly can | |
972 | * increase the levels. | |
973 | */ | |
d7c2c9e3 | 974 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
1da177e4 LT |
975 | } |
976 | ||
977 | done: | |
978 | sctp_ulpevent_release_owner(event); | |
979 | } | |
980 | ||
981 | /* Free a ulpevent that has an owner. It includes releasing the reference | |
982 | * to the owner, updating the rwnd in case of a DATA event and freeing the | |
983 | * skb. | |
1da177e4 LT |
984 | */ |
985 | void sctp_ulpevent_free(struct sctp_ulpevent *event) | |
986 | { | |
987 | if (sctp_ulpevent_is_notification(event)) | |
988 | sctp_ulpevent_release_owner(event); | |
989 | else | |
990 | sctp_ulpevent_release_data(event); | |
991 | ||
992 | kfree_skb(sctp_event2skb(event)); | |
993 | } | |
994 | ||
995 | /* Purge the skb lists holding ulpevents. */ | |
996 | void sctp_queue_purge_ulpevents(struct sk_buff_head *list) | |
997 | { | |
998 | struct sk_buff *skb; | |
999 | while ((skb = skb_dequeue(list)) != NULL) | |
1000 | sctp_ulpevent_free(sctp_skb2event(skb)); | |
1001 | } |