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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 | 53 | static void sctp_ulpevent_init(struct sctp_ulpevent *event, |
f5d258e6 | 54 | __u16 msg_flags, |
dda91928 | 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. */ | |
f5d258e6 | 63 | static struct sctp_ulpevent *sctp_ulpevent_new(int size, __u16 msg_flags, |
dda91928 | 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 | { | |
52253db9 | 94 | struct sctp_chunk *chunk = event->chunk; |
1da177e4 LT |
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); | |
52253db9 MRL |
105 | if (chunk && chunk->head_skb && !chunk->head_skb->sk) |
106 | chunk->head_skb->sk = asoc->base.sk; | |
1da177e4 LT |
107 | } |
108 | ||
109 | /* A simple destructor to give up the reference to the association. */ | |
110 | static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) | |
111 | { | |
049b3ff5 | 112 | struct sctp_association *asoc = event->asoc; |
049b3ff5 | 113 | |
331c4ee7 | 114 | atomic_sub(event->rmem_len, &asoc->rmem_alloc); |
049b3ff5 | 115 | sctp_association_put(asoc); |
1da177e4 LT |
116 | } |
117 | ||
118 | /* Create and initialize an SCTP_ASSOC_CHANGE event. | |
119 | * | |
120 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
121 | * | |
122 | * Communication notifications inform the ULP that an SCTP association | |
123 | * has either begun or ended. The identifier for a new association is | |
124 | * provided by this notification. | |
125 | * | |
126 | * Note: There is no field checking here. If a field is unused it will be | |
127 | * zero'd out. | |
128 | */ | |
129 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( | |
130 | const struct sctp_association *asoc, | |
131 | __u16 flags, __u16 state, __u16 error, __u16 outbound, | |
a5a35e76 | 132 | __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp) |
1da177e4 LT |
133 | { |
134 | struct sctp_ulpevent *event; | |
135 | struct sctp_assoc_change *sac; | |
136 | struct sk_buff *skb; | |
137 | ||
a5a35e76 VY |
138 | /* If the lower layer passed in the chunk, it will be |
139 | * an ABORT, so we need to include it in the sac_info. | |
140 | */ | |
141 | if (chunk) { | |
a5a35e76 VY |
142 | /* Copy the chunk data to a new skb and reserve enough |
143 | * head room to use as notification. | |
144 | */ | |
145 | skb = skb_copy_expand(chunk->skb, | |
146 | sizeof(struct sctp_assoc_change), 0, gfp); | |
147 | ||
148 | if (!skb) | |
149 | goto fail; | |
150 | ||
a5a35e76 VY |
151 | /* Embed the event fields inside the cloned skb. */ |
152 | event = sctp_skb2event(skb); | |
153 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); | |
154 | ||
155 | /* Include the notification structure */ | |
d58ff351 | 156 | sac = skb_push(skb, sizeof(struct sctp_assoc_change)); |
a5a35e76 VY |
157 | |
158 | /* Trim the buffer to the right length. */ | |
159 | skb_trim(skb, sizeof(struct sctp_assoc_change) + | |
ac40e41f | 160 | ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 161 | sizeof(struct sctp_chunkhdr)); |
a5a35e76 VY |
162 | } else { |
163 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change), | |
1da177e4 | 164 | MSG_NOTIFICATION, gfp); |
a5a35e76 VY |
165 | if (!event) |
166 | goto fail; | |
167 | ||
168 | skb = sctp_event2skb(event); | |
4df864c1 | 169 | sac = skb_put(skb, sizeof(struct sctp_assoc_change)); |
a5a35e76 | 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); | |
4df864c1 | 271 | spc = skb_put(skb, sizeof(struct sctp_paddr_change)); |
1da177e4 LT |
272 | |
273 | /* Sockets API Extensions for SCTP | |
274 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
275 | * | |
276 | * spc_type: | |
277 | * | |
278 | * It should be SCTP_PEER_ADDR_CHANGE. | |
279 | */ | |
280 | spc->spc_type = SCTP_PEER_ADDR_CHANGE; | |
281 | ||
282 | /* Sockets API Extensions for SCTP | |
283 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
284 | * | |
285 | * spc_length: sizeof (__u32) | |
286 | * | |
287 | * This field is the total length of the notification data, including | |
288 | * the notification header. | |
289 | */ | |
290 | spc->spc_length = sizeof(struct sctp_paddr_change); | |
291 | ||
292 | /* Sockets API Extensions for SCTP | |
293 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
294 | * | |
295 | * spc_flags: 16 bits (unsigned integer) | |
296 | * Currently unused. | |
297 | */ | |
298 | spc->spc_flags = 0; | |
299 | ||
300 | /* Sockets API Extensions for SCTP | |
301 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
302 | * | |
303 | * spc_state: 32 bits (signed integer) | |
304 | * | |
305 | * This field holds one of a number of values that communicate the | |
306 | * event that happened to the address. | |
307 | */ | |
308 | spc->spc_state = state; | |
309 | ||
310 | /* Sockets API Extensions for SCTP | |
311 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
312 | * | |
313 | * spc_error: 32 bits (signed integer) | |
314 | * | |
315 | * If the state was reached due to any error condition (e.g. | |
316 | * ADDRESS_UNREACHABLE) any relevant error information is available in | |
317 | * this field. | |
318 | */ | |
319 | spc->spc_error = error; | |
320 | ||
321 | /* Socket Extensions for SCTP | |
322 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
323 | * | |
324 | * spc_assoc_id: sizeof (sctp_assoc_t) | |
325 | * | |
326 | * The association id field, holds the identifier for the association. | |
327 | * All notifications for a given association have the same association | |
328 | * identifier. For TCP style socket, this field is ignored. | |
329 | */ | |
330 | sctp_ulpevent_set_owner(event, asoc); | |
331 | spc->spc_assoc_id = sctp_assoc2id(asoc); | |
332 | ||
333 | /* Sockets API Extensions for SCTP | |
334 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
335 | * | |
336 | * spc_aaddr: sizeof (struct sockaddr_storage) | |
337 | * | |
338 | * The affected address field, holds the remote peer's address that is | |
339 | * encountering the change of state. | |
340 | */ | |
341 | memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage)); | |
342 | ||
343 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
299ee123 | 344 | sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_to_user( |
1da177e4 LT |
345 | sctp_sk(asoc->base.sk), |
346 | (union sctp_addr *)&spc->spc_aaddr); | |
347 | ||
348 | return event; | |
349 | ||
350 | fail: | |
351 | return NULL; | |
352 | } | |
353 | ||
354 | /* Create and initialize an SCTP_REMOTE_ERROR notification. | |
355 | * | |
356 | * Note: This assumes that the chunk->skb->data already points to the | |
357 | * operation error payload. | |
358 | * | |
359 | * Socket Extensions for SCTP - draft-01 | |
360 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
361 | * | |
362 | * A remote peer may send an Operational Error message to its peer. | |
363 | * This message indicates a variety of error conditions on an | |
364 | * association. The entire error TLV as it appears on the wire is | |
365 | * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP | |
366 | * specification [SCTP] and any extensions for a list of possible | |
367 | * error formats. | |
368 | */ | |
8f2e5ae4 DB |
369 | struct sctp_ulpevent * |
370 | sctp_ulpevent_make_remote_error(const struct sctp_association *asoc, | |
371 | struct sctp_chunk *chunk, __u16 flags, | |
372 | gfp_t gfp) | |
1da177e4 | 373 | { |
1da177e4 | 374 | struct sctp_remote_error *sre; |
d8238d9d XL |
375 | struct sctp_ulpevent *event; |
376 | struct sctp_errhdr *ch; | |
1da177e4 | 377 | struct sk_buff *skb; |
9f81bcd9 | 378 | __be16 cause; |
1da177e4 LT |
379 | int elen; |
380 | ||
d8238d9d | 381 | ch = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4 | 382 | cause = ch->cause; |
d8238d9d | 383 | elen = SCTP_PAD4(ntohs(ch->length)) - sizeof(*ch); |
1da177e4 LT |
384 | |
385 | /* Pull off the ERROR header. */ | |
d8238d9d | 386 | skb_pull(chunk->skb, sizeof(*ch)); |
1da177e4 LT |
387 | |
388 | /* Copy the skb to a new skb with room for us to prepend | |
389 | * notification with. | |
390 | */ | |
8f2e5ae4 | 391 | skb = skb_copy_expand(chunk->skb, sizeof(*sre), 0, gfp); |
1da177e4 LT |
392 | |
393 | /* Pull off the rest of the cause TLV from the chunk. */ | |
394 | skb_pull(chunk->skb, elen); | |
395 | if (!skb) | |
396 | goto fail; | |
397 | ||
398 | /* Embed the event fields inside the cloned skb. */ | |
399 | event = sctp_skb2event(skb); | |
331c4ee7 | 400 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 | 401 | |
d58ff351 | 402 | sre = skb_push(skb, sizeof(*sre)); |
1da177e4 LT |
403 | |
404 | /* Trim the buffer to the right length. */ | |
8f2e5ae4 | 405 | skb_trim(skb, sizeof(*sre) + elen); |
1da177e4 | 406 | |
8f2e5ae4 DB |
407 | /* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */ |
408 | memset(sre, 0, sizeof(*sre)); | |
1da177e4 | 409 | sre->sre_type = SCTP_REMOTE_ERROR; |
1da177e4 | 410 | sre->sre_flags = 0; |
1da177e4 | 411 | sre->sre_length = skb->len; |
1da177e4 | 412 | sre->sre_error = cause; |
1da177e4 LT |
413 | sctp_ulpevent_set_owner(event, asoc); |
414 | sre->sre_assoc_id = sctp_assoc2id(asoc); | |
415 | ||
416 | return event; | |
1da177e4 LT |
417 | fail: |
418 | return NULL; | |
419 | } | |
420 | ||
421 | /* Create and initialize a SCTP_SEND_FAILED notification. | |
422 | * | |
423 | * Socket Extensions for SCTP - draft-01 | |
424 | * 5.3.1.4 SCTP_SEND_FAILED | |
425 | */ | |
426 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( | |
427 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 428 | __u16 flags, __u32 error, gfp_t gfp) |
1da177e4 LT |
429 | { |
430 | struct sctp_ulpevent *event; | |
431 | struct sctp_send_failed *ssf; | |
432 | struct sk_buff *skb; | |
433 | ||
434 | /* Pull off any padding. */ | |
435 | int len = ntohs(chunk->chunk_hdr->length); | |
436 | ||
437 | /* Make skb with more room so we can prepend notification. */ | |
438 | skb = skb_copy_expand(chunk->skb, | |
439 | sizeof(struct sctp_send_failed), /* headroom */ | |
440 | 0, /* tailroom */ | |
441 | gfp); | |
442 | if (!skb) | |
443 | goto fail; | |
444 | ||
445 | /* Pull off the common chunk header and DATA header. */ | |
446 | skb_pull(skb, sizeof(struct sctp_data_chunk)); | |
447 | len -= sizeof(struct sctp_data_chunk); | |
448 | ||
449 | /* Embed the event fields inside the cloned skb. */ | |
450 | event = sctp_skb2event(skb); | |
331c4ee7 | 451 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 | 452 | |
d58ff351 | 453 | ssf = skb_push(skb, sizeof(struct sctp_send_failed)); |
1da177e4 LT |
454 | |
455 | /* Socket Extensions for SCTP | |
456 | * 5.3.1.4 SCTP_SEND_FAILED | |
457 | * | |
458 | * ssf_type: | |
459 | * It should be SCTP_SEND_FAILED. | |
460 | */ | |
461 | ssf->ssf_type = SCTP_SEND_FAILED; | |
462 | ||
463 | /* Socket Extensions for SCTP | |
464 | * 5.3.1.4 SCTP_SEND_FAILED | |
465 | * | |
466 | * ssf_flags: 16 bits (unsigned integer) | |
467 | * The flag value will take one of the following values | |
468 | * | |
469 | * SCTP_DATA_UNSENT - Indicates that the data was never put on | |
470 | * the wire. | |
471 | * | |
472 | * SCTP_DATA_SENT - Indicates that the data was put on the wire. | |
473 | * Note that this does not necessarily mean that the | |
474 | * data was (or was not) successfully delivered. | |
475 | */ | |
476 | ssf->ssf_flags = flags; | |
477 | ||
478 | /* Socket Extensions for SCTP | |
479 | * 5.3.1.4 SCTP_SEND_FAILED | |
480 | * | |
481 | * ssf_length: sizeof (__u32) | |
482 | * This field is the total length of the notification data, including | |
483 | * the notification header. | |
484 | */ | |
485 | ssf->ssf_length = sizeof(struct sctp_send_failed) + len; | |
486 | skb_trim(skb, ssf->ssf_length); | |
487 | ||
488 | /* Socket Extensions for SCTP | |
489 | * 5.3.1.4 SCTP_SEND_FAILED | |
490 | * | |
491 | * ssf_error: 16 bits (unsigned integer) | |
492 | * This value represents the reason why the send failed, and if set, | |
493 | * will be a SCTP protocol error code as defined in [SCTP] section | |
494 | * 3.3.10. | |
495 | */ | |
496 | ssf->ssf_error = error; | |
497 | ||
498 | /* Socket Extensions for SCTP | |
499 | * 5.3.1.4 SCTP_SEND_FAILED | |
500 | * | |
501 | * ssf_info: sizeof (struct sctp_sndrcvinfo) | |
502 | * The original send information associated with the undelivered | |
503 | * message. | |
504 | */ | |
505 | memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); | |
506 | ||
507 | /* Per TSVWG discussion with Randy. Allow the application to | |
e9c54999 | 508 | * reassemble a fragmented message. |
1da177e4 LT |
509 | */ |
510 | ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; | |
511 | ||
512 | /* Socket Extensions for SCTP | |
513 | * 5.3.1.4 SCTP_SEND_FAILED | |
514 | * | |
515 | * ssf_assoc_id: sizeof (sctp_assoc_t) | |
516 | * The association id field, sf_assoc_id, holds the identifier for the | |
517 | * association. All notifications for a given association have the | |
518 | * same association identifier. For TCP style socket, this field is | |
519 | * ignored. | |
520 | */ | |
521 | sctp_ulpevent_set_owner(event, asoc); | |
522 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); | |
523 | return event; | |
524 | ||
525 | fail: | |
526 | return NULL; | |
527 | } | |
528 | ||
529 | /* Create and initialize a SCTP_SHUTDOWN_EVENT notification. | |
530 | * | |
531 | * Socket Extensions for SCTP - draft-01 | |
532 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
533 | */ | |
534 | struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( | |
535 | const struct sctp_association *asoc, | |
dd0fc66f | 536 | __u16 flags, gfp_t gfp) |
1da177e4 LT |
537 | { |
538 | struct sctp_ulpevent *event; | |
539 | struct sctp_shutdown_event *sse; | |
540 | struct sk_buff *skb; | |
541 | ||
542 | event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event), | |
543 | MSG_NOTIFICATION, gfp); | |
544 | if (!event) | |
545 | goto fail; | |
546 | ||
547 | skb = sctp_event2skb(event); | |
4df864c1 | 548 | sse = skb_put(skb, sizeof(struct sctp_shutdown_event)); |
1da177e4 LT |
549 | |
550 | /* Socket Extensions for SCTP | |
551 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
552 | * | |
553 | * sse_type | |
554 | * It should be SCTP_SHUTDOWN_EVENT | |
555 | */ | |
556 | sse->sse_type = SCTP_SHUTDOWN_EVENT; | |
557 | ||
558 | /* Socket Extensions for SCTP | |
559 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
560 | * | |
561 | * sse_flags: 16 bits (unsigned integer) | |
562 | * Currently unused. | |
563 | */ | |
564 | sse->sse_flags = 0; | |
565 | ||
566 | /* Socket Extensions for SCTP | |
567 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
568 | * | |
569 | * sse_length: sizeof (__u32) | |
570 | * This field is the total length of the notification data, including | |
571 | * the notification header. | |
572 | */ | |
573 | sse->sse_length = sizeof(struct sctp_shutdown_event); | |
574 | ||
575 | /* Socket Extensions for SCTP | |
576 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
577 | * | |
578 | * sse_assoc_id: sizeof (sctp_assoc_t) | |
579 | * The association id field, holds the identifier for the association. | |
580 | * All notifications for a given association have the same association | |
581 | * identifier. For TCP style socket, this field is ignored. | |
582 | */ | |
583 | sctp_ulpevent_set_owner(event, asoc); | |
584 | sse->sse_assoc_id = sctp_assoc2id(asoc); | |
585 | ||
586 | return event; | |
587 | ||
588 | fail: | |
589 | return NULL; | |
590 | } | |
591 | ||
0f3fffd8 | 592 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
1da177e4 LT |
593 | * |
594 | * Socket Extensions for SCTP | |
0f3fffd8 | 595 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
1da177e4 | 596 | */ |
0f3fffd8 | 597 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
dd0fc66f | 598 | const struct sctp_association *asoc, gfp_t gfp) |
1da177e4 LT |
599 | { |
600 | struct sctp_ulpevent *event; | |
0f3fffd8 | 601 | struct sctp_adaptation_event *sai; |
1da177e4 LT |
602 | struct sk_buff *skb; |
603 | ||
0f3fffd8 | 604 | event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event), |
1da177e4 LT |
605 | MSG_NOTIFICATION, gfp); |
606 | if (!event) | |
607 | goto fail; | |
608 | ||
609 | skb = sctp_event2skb(event); | |
4df864c1 | 610 | sai = skb_put(skb, sizeof(struct sctp_adaptation_event)); |
1da177e4 | 611 | |
0f3fffd8 | 612 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
1da177e4 | 613 | sai->sai_flags = 0; |
0f3fffd8 ISJ |
614 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
615 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
616 | sctp_ulpevent_set_owner(event, asoc); |
617 | sai->sai_assoc_id = sctp_assoc2id(asoc); | |
618 | ||
619 | return event; | |
620 | ||
621 | fail: | |
622 | return NULL; | |
623 | } | |
624 | ||
625 | /* A message has been received. Package this message as a notification | |
626 | * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo | |
627 | * even if filtered out later. | |
628 | * | |
629 | * Socket Extensions for SCTP | |
630 | * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) | |
631 | */ | |
632 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, | |
633 | struct sctp_chunk *chunk, | |
dd0fc66f | 634 | gfp_t gfp) |
1da177e4 LT |
635 | { |
636 | struct sctp_ulpevent *event = NULL; | |
1bc9dafa XL |
637 | struct sk_buff *skb = chunk->skb; |
638 | struct sock *sk = asoc->base.sk; | |
639 | size_t padding, datalen; | |
4d93df0a NH |
640 | int rx_count; |
641 | ||
642 | /* | |
643 | * check to see if we need to make space for this | |
644 | * new skb, expand the rcvbuffer if needed, or drop | |
645 | * the frame | |
646 | */ | |
647 | if (asoc->ep->rcvbuf_policy) | |
648 | rx_count = atomic_read(&asoc->rmem_alloc); | |
649 | else | |
1bc9dafa | 650 | rx_count = atomic_read(&sk->sk_rmem_alloc); |
4d93df0a | 651 | |
1bc9dafa | 652 | datalen = ntohs(chunk->chunk_hdr->length); |
4d93df0a | 653 | |
1bc9dafa XL |
654 | if (rx_count >= sk->sk_rcvbuf || !sk_rmem_schedule(sk, skb, datalen)) |
655 | goto fail; | |
1da177e4 LT |
656 | |
657 | /* Clone the original skb, sharing the data. */ | |
658 | skb = skb_clone(chunk->skb, gfp); | |
659 | if (!skb) | |
660 | goto fail; | |
661 | ||
3888e9ef VY |
662 | /* Now that all memory allocations for this chunk succeeded, we |
663 | * can mark it as received so the tsn_map is updated correctly. | |
664 | */ | |
8e1ee18c | 665 | if (sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d NH |
666 | ntohl(chunk->subh.data_hdr->tsn), |
667 | chunk->transport)) | |
8e1ee18c | 668 | goto fail_mark; |
3888e9ef | 669 | |
1da177e4 LT |
670 | /* First calculate the padding, so we don't inadvertently |
671 | * pass up the wrong length to the user. | |
672 | * | |
673 | * RFC 2960 - Section 3.2 Chunk Field Descriptions | |
674 | * | |
675 | * The total length of a chunk(including Type, Length and Value fields) | |
676 | * MUST be a multiple of 4 bytes. If the length of the chunk is not a | |
677 | * multiple of 4 bytes, the sender MUST pad the chunk with all zero | |
678 | * bytes and this padding is not included in the chunk length field. | |
679 | * The sender should never pad with more than 3 bytes. The receiver | |
680 | * MUST ignore the padding bytes. | |
681 | */ | |
1bc9dafa | 682 | padding = SCTP_PAD4(datalen) - datalen; |
1da177e4 LT |
683 | |
684 | /* Fixup cloned skb with just this chunks data. */ | |
685 | skb_trim(skb, chunk->chunk_end - padding - skb->data); | |
686 | ||
687 | /* Embed the event fields inside the cloned skb. */ | |
688 | event = sctp_skb2event(skb); | |
689 | ||
331c4ee7 VY |
690 | /* Initialize event with flags 0 and correct length |
691 | * Since this is a clone of the original skb, only account for | |
692 | * the data of this chunk as other chunks will be accounted separately. | |
693 | */ | |
694 | sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff)); | |
1da177e4 | 695 | |
1f45f78f MRL |
696 | /* And hold the chunk as we need it for getting the IP headers |
697 | * later in recvmsg | |
698 | */ | |
699 | sctp_chunk_hold(chunk); | |
700 | event->chunk = chunk; | |
701 | ||
1fe323aa XL |
702 | sctp_ulpevent_receive_data(event, asoc); |
703 | ||
1da177e4 LT |
704 | event->stream = ntohs(chunk->subh.data_hdr->stream); |
705 | event->ssn = ntohs(chunk->subh.data_hdr->ssn); | |
706 | event->ppid = chunk->subh.data_hdr->ppid; | |
707 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
eaa5c54d | 708 | event->flags |= SCTP_UNORDERED; |
1da177e4 LT |
709 | event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
710 | } | |
711 | event->tsn = ntohl(chunk->subh.data_hdr->tsn); | |
712 | event->msg_flags |= chunk->chunk_hdr->flags; | |
1da177e4 | 713 | |
1da177e4 | 714 | return event; |
8e1ee18c VY |
715 | |
716 | fail_mark: | |
717 | kfree_skb(skb); | |
718 | fail: | |
719 | return NULL; | |
1da177e4 LT |
720 | } |
721 | ||
722 | /* Create a partial delivery related event. | |
723 | * | |
724 | * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT | |
725 | * | |
726 | * When a receiver is engaged in a partial delivery of a | |
727 | * message this notification will be used to indicate | |
728 | * various events. | |
729 | */ | |
730 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( | |
3182cd84 | 731 | const struct sctp_association *asoc, __u32 indication, |
dd0fc66f | 732 | gfp_t gfp) |
1da177e4 LT |
733 | { |
734 | struct sctp_ulpevent *event; | |
735 | struct sctp_pdapi_event *pd; | |
736 | struct sk_buff *skb; | |
737 | ||
738 | event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event), | |
739 | MSG_NOTIFICATION, gfp); | |
740 | if (!event) | |
741 | goto fail; | |
742 | ||
743 | skb = sctp_event2skb(event); | |
4df864c1 | 744 | pd = skb_put(skb, sizeof(struct sctp_pdapi_event)); |
1da177e4 LT |
745 | |
746 | /* pdapi_type | |
747 | * It should be SCTP_PARTIAL_DELIVERY_EVENT | |
748 | * | |
749 | * pdapi_flags: 16 bits (unsigned integer) | |
750 | * Currently unused. | |
751 | */ | |
752 | pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; | |
753 | pd->pdapi_flags = 0; | |
754 | ||
755 | /* pdapi_length: 32 bits (unsigned integer) | |
756 | * | |
757 | * This field is the total length of the notification data, including | |
758 | * the notification header. It will generally be sizeof (struct | |
759 | * sctp_pdapi_event). | |
760 | */ | |
761 | pd->pdapi_length = sizeof(struct sctp_pdapi_event); | |
762 | ||
d808ad9a | 763 | /* pdapi_indication: 32 bits (unsigned integer) |
1da177e4 LT |
764 | * |
765 | * This field holds the indication being sent to the application. | |
766 | */ | |
767 | pd->pdapi_indication = indication; | |
768 | ||
769 | /* pdapi_assoc_id: sizeof (sctp_assoc_t) | |
770 | * | |
771 | * The association id field, holds the identifier for the association. | |
772 | */ | |
773 | sctp_ulpevent_set_owner(event, asoc); | |
774 | pd->pdapi_assoc_id = sctp_assoc2id(asoc); | |
775 | ||
776 | return event; | |
777 | fail: | |
778 | return NULL; | |
779 | } | |
780 | ||
65b07e5d VY |
781 | struct sctp_ulpevent *sctp_ulpevent_make_authkey( |
782 | const struct sctp_association *asoc, __u16 key_id, | |
783 | __u32 indication, gfp_t gfp) | |
784 | { | |
785 | struct sctp_ulpevent *event; | |
786 | struct sctp_authkey_event *ak; | |
787 | struct sk_buff *skb; | |
788 | ||
789 | event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event), | |
790 | MSG_NOTIFICATION, gfp); | |
791 | if (!event) | |
792 | goto fail; | |
793 | ||
794 | skb = sctp_event2skb(event); | |
4df864c1 | 795 | ak = skb_put(skb, sizeof(struct sctp_authkey_event)); |
65b07e5d | 796 | |
ee916fd0 | 797 | ak->auth_type = SCTP_AUTHENTICATION_EVENT; |
65b07e5d VY |
798 | ak->auth_flags = 0; |
799 | ak->auth_length = sizeof(struct sctp_authkey_event); | |
800 | ||
801 | ak->auth_keynumber = key_id; | |
802 | ak->auth_altkeynumber = 0; | |
803 | ak->auth_indication = indication; | |
804 | ||
805 | /* | |
806 | * The association id field, holds the identifier for the association. | |
807 | */ | |
808 | sctp_ulpevent_set_owner(event, asoc); | |
809 | ak->auth_assoc_id = sctp_assoc2id(asoc); | |
810 | ||
811 | return event; | |
812 | fail: | |
813 | return NULL; | |
814 | } | |
815 | ||
e1cdd553 WY |
816 | /* |
817 | * Socket Extensions for SCTP | |
818 | * 6.3.10. SCTP_SENDER_DRY_EVENT | |
819 | */ | |
820 | struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event( | |
821 | const struct sctp_association *asoc, gfp_t gfp) | |
822 | { | |
823 | struct sctp_ulpevent *event; | |
824 | struct sctp_sender_dry_event *sdry; | |
825 | struct sk_buff *skb; | |
826 | ||
827 | event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event), | |
828 | MSG_NOTIFICATION, gfp); | |
829 | if (!event) | |
830 | return NULL; | |
831 | ||
832 | skb = sctp_event2skb(event); | |
4df864c1 | 833 | sdry = skb_put(skb, sizeof(struct sctp_sender_dry_event)); |
e1cdd553 WY |
834 | |
835 | sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT; | |
836 | sdry->sender_dry_flags = 0; | |
837 | sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event); | |
838 | sctp_ulpevent_set_owner(event, asoc); | |
839 | sdry->sender_dry_assoc_id = sctp_assoc2id(asoc); | |
840 | ||
841 | return event; | |
842 | } | |
65b07e5d | 843 | |
35ea82d6 XL |
844 | struct sctp_ulpevent *sctp_ulpevent_make_stream_reset_event( |
845 | const struct sctp_association *asoc, __u16 flags, __u16 stream_num, | |
1da4fc97 | 846 | __be16 *stream_list, gfp_t gfp) |
35ea82d6 XL |
847 | { |
848 | struct sctp_stream_reset_event *sreset; | |
849 | struct sctp_ulpevent *event; | |
850 | struct sk_buff *skb; | |
851 | int length, i; | |
852 | ||
853 | length = sizeof(struct sctp_stream_reset_event) + 2 * stream_num; | |
854 | event = sctp_ulpevent_new(length, MSG_NOTIFICATION, gfp); | |
855 | if (!event) | |
856 | return NULL; | |
857 | ||
858 | skb = sctp_event2skb(event); | |
4df864c1 | 859 | sreset = skb_put(skb, length); |
35ea82d6 XL |
860 | |
861 | sreset->strreset_type = SCTP_STREAM_RESET_EVENT; | |
862 | sreset->strreset_flags = flags; | |
863 | sreset->strreset_length = length; | |
864 | sctp_ulpevent_set_owner(event, asoc); | |
865 | sreset->strreset_assoc_id = sctp_assoc2id(asoc); | |
866 | ||
867 | for (i = 0; i < stream_num; i++) | |
868 | sreset->strreset_stream_list[i] = ntohs(stream_list[i]); | |
869 | ||
870 | return event; | |
871 | } | |
872 | ||
c95129d1 XL |
873 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event( |
874 | const struct sctp_association *asoc, __u16 flags, __u32 local_tsn, | |
875 | __u32 remote_tsn, gfp_t gfp) | |
876 | { | |
877 | struct sctp_assoc_reset_event *areset; | |
878 | struct sctp_ulpevent *event; | |
879 | struct sk_buff *skb; | |
880 | ||
881 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_reset_event), | |
882 | MSG_NOTIFICATION, gfp); | |
883 | if (!event) | |
884 | return NULL; | |
885 | ||
886 | skb = sctp_event2skb(event); | |
4df864c1 | 887 | areset = skb_put(skb, sizeof(struct sctp_assoc_reset_event)); |
c95129d1 XL |
888 | |
889 | areset->assocreset_type = SCTP_ASSOC_RESET_EVENT; | |
890 | areset->assocreset_flags = flags; | |
891 | areset->assocreset_length = sizeof(struct sctp_assoc_reset_event); | |
892 | sctp_ulpevent_set_owner(event, asoc); | |
893 | areset->assocreset_assoc_id = sctp_assoc2id(asoc); | |
894 | areset->assocreset_local_tsn = local_tsn; | |
895 | areset->assocreset_remote_tsn = remote_tsn; | |
896 | ||
897 | return event; | |
898 | } | |
899 | ||
b444153f XL |
900 | struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event( |
901 | const struct sctp_association *asoc, __u16 flags, | |
902 | __u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp) | |
903 | { | |
904 | struct sctp_stream_change_event *schange; | |
905 | struct sctp_ulpevent *event; | |
906 | struct sk_buff *skb; | |
907 | ||
908 | event = sctp_ulpevent_new(sizeof(struct sctp_stream_change_event), | |
909 | MSG_NOTIFICATION, gfp); | |
910 | if (!event) | |
911 | return NULL; | |
912 | ||
913 | skb = sctp_event2skb(event); | |
4df864c1 | 914 | schange = skb_put(skb, sizeof(struct sctp_stream_change_event)); |
b444153f XL |
915 | |
916 | schange->strchange_type = SCTP_STREAM_CHANGE_EVENT; | |
917 | schange->strchange_flags = flags; | |
918 | schange->strchange_length = sizeof(struct sctp_stream_change_event); | |
919 | sctp_ulpevent_set_owner(event, asoc); | |
920 | schange->strchange_assoc_id = sctp_assoc2id(asoc); | |
921 | schange->strchange_instrms = strchange_instrms; | |
922 | schange->strchange_outstrms = strchange_outstrms; | |
923 | ||
924 | return event; | |
925 | } | |
926 | ||
1da177e4 LT |
927 | /* Return the notification type, assuming this is a notification |
928 | * event. | |
929 | */ | |
930 | __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) | |
931 | { | |
932 | union sctp_notification *notification; | |
933 | struct sk_buff *skb; | |
934 | ||
ab38fb04 | 935 | skb = sctp_event2skb(event); |
1da177e4 LT |
936 | notification = (union sctp_notification *) skb->data; |
937 | return notification->sn_header.sn_type; | |
938 | } | |
939 | ||
8f2e5ae4 DB |
940 | /* RFC6458, Section 5.3.2. SCTP Header Information Structure |
941 | * (SCTP_SNDRCV, DEPRECATED) | |
942 | */ | |
1da177e4 LT |
943 | void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, |
944 | struct msghdr *msghdr) | |
945 | { | |
946 | struct sctp_sndrcvinfo sinfo; | |
947 | ||
948 | if (sctp_ulpevent_is_notification(event)) | |
949 | return; | |
950 | ||
8f2e5ae4 | 951 | memset(&sinfo, 0, sizeof(sinfo)); |
1da177e4 | 952 | sinfo.sinfo_stream = event->stream; |
1da177e4 | 953 | sinfo.sinfo_ssn = event->ssn; |
1da177e4 | 954 | sinfo.sinfo_ppid = event->ppid; |
1da177e4 | 955 | sinfo.sinfo_flags = event->flags; |
1da177e4 | 956 | sinfo.sinfo_tsn = event->tsn; |
1da177e4 | 957 | sinfo.sinfo_cumtsn = event->cumtsn; |
1da177e4 | 958 | sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); |
8f2e5ae4 | 959 | /* Context value that is set via SCTP_CONTEXT socket option. */ |
6ab792f5 | 960 | sinfo.sinfo_context = event->asoc->default_rcv_context; |
1da177e4 | 961 | /* These fields are not used while receiving. */ |
1da177e4 LT |
962 | sinfo.sinfo_timetolive = 0; |
963 | ||
964 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, | |
8f2e5ae4 | 965 | sizeof(sinfo), &sinfo); |
1da177e4 LT |
966 | } |
967 | ||
0d3a421d GOV |
968 | /* RFC6458, Section 5.3.5 SCTP Receive Information Structure |
969 | * (SCTP_SNDRCV) | |
970 | */ | |
971 | void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event, | |
972 | struct msghdr *msghdr) | |
973 | { | |
974 | struct sctp_rcvinfo rinfo; | |
975 | ||
976 | if (sctp_ulpevent_is_notification(event)) | |
977 | return; | |
978 | ||
979 | memset(&rinfo, 0, sizeof(struct sctp_rcvinfo)); | |
980 | rinfo.rcv_sid = event->stream; | |
981 | rinfo.rcv_ssn = event->ssn; | |
982 | rinfo.rcv_ppid = event->ppid; | |
983 | rinfo.rcv_flags = event->flags; | |
984 | rinfo.rcv_tsn = event->tsn; | |
985 | rinfo.rcv_cumtsn = event->cumtsn; | |
986 | rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc); | |
987 | rinfo.rcv_context = event->asoc->default_rcv_context; | |
988 | ||
989 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO, | |
990 | sizeof(rinfo), &rinfo); | |
991 | } | |
992 | ||
2347c80f GOV |
993 | /* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure |
994 | * (SCTP_NXTINFO) | |
995 | */ | |
996 | static void __sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event, | |
997 | struct msghdr *msghdr, | |
998 | const struct sk_buff *skb) | |
999 | { | |
1000 | struct sctp_nxtinfo nxtinfo; | |
1001 | ||
1002 | memset(&nxtinfo, 0, sizeof(nxtinfo)); | |
1003 | nxtinfo.nxt_sid = event->stream; | |
1004 | nxtinfo.nxt_ppid = event->ppid; | |
1005 | nxtinfo.nxt_flags = event->flags; | |
1006 | if (sctp_ulpevent_is_notification(event)) | |
1007 | nxtinfo.nxt_flags |= SCTP_NOTIFICATION; | |
1008 | nxtinfo.nxt_length = skb->len; | |
1009 | nxtinfo.nxt_assoc_id = sctp_assoc2id(event->asoc); | |
1010 | ||
1011 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO, | |
1012 | sizeof(nxtinfo), &nxtinfo); | |
1013 | } | |
1014 | ||
1015 | void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event, | |
1016 | struct msghdr *msghdr, | |
1017 | struct sock *sk) | |
1018 | { | |
1019 | struct sk_buff *skb; | |
1020 | int err; | |
1021 | ||
1022 | skb = sctp_skb_recv_datagram(sk, MSG_PEEK, 1, &err); | |
1023 | if (skb != NULL) { | |
1024 | __sctp_ulpevent_read_nxtinfo(sctp_skb2event(skb), | |
1025 | msghdr, skb); | |
1026 | /* Just release refcount here. */ | |
1027 | kfree_skb(skb); | |
1028 | } | |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | /* Do accounting for bytes received and hold a reference to the association |
1032 | * for each skb. | |
1033 | */ | |
1034 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
1035 | struct sctp_association *asoc) | |
1036 | { | |
1037 | struct sk_buff *skb, *frag; | |
1038 | ||
1039 | skb = sctp_event2skb(event); | |
1040 | /* Set the owner and charge rwnd for bytes received. */ | |
1041 | sctp_ulpevent_set_owner(event, asoc); | |
362d5204 | 1042 | sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); |
1da177e4 LT |
1043 | |
1044 | if (!skb->data_len) | |
1045 | return; | |
1046 | ||
1047 | /* Note: Not clearing the entire event struct as this is just a | |
1048 | * fragment of the real event. However, we still need to do rwnd | |
1049 | * accounting. | |
1050 | * In general, the skb passed from IP can have only 1 level of | |
d808ad9a | 1051 | * fragments. But we allow multiple levels of fragments. |
1da177e4 | 1052 | */ |
1b003be3 | 1053 | skb_walk_frags(skb, frag) |
1da177e4 | 1054 | sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); |
1da177e4 LT |
1055 | } |
1056 | ||
1057 | /* Do accounting for bytes just read by user and release the references to | |
1058 | * the association. | |
d808ad9a | 1059 | */ |
1da177e4 LT |
1060 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
1061 | { | |
1062 | struct sk_buff *skb, *frag; | |
d7c2c9e3 | 1063 | unsigned int len; |
1da177e4 LT |
1064 | |
1065 | /* Current stack structures assume that the rcv buffer is | |
1066 | * per socket. For UDP style sockets this is not true as | |
1067 | * multiple associations may be on a single UDP-style socket. | |
1068 | * Use the local private area of the skb to track the owning | |
1069 | * association. | |
1070 | */ | |
1071 | ||
1072 | skb = sctp_event2skb(event); | |
d7c2c9e3 TF |
1073 | len = skb->len; |
1074 | ||
1075 | if (!skb->data_len) | |
1076 | goto done; | |
1077 | ||
1078 | /* Don't forget the fragments. */ | |
1b003be3 | 1079 | skb_walk_frags(skb, frag) { |
d7c2c9e3 TF |
1080 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1081 | * skb's with only 1 level of fragments, SCTP reassembly can | |
1082 | * increase the levels. | |
1083 | */ | |
1084 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); | |
1085 | } | |
1086 | ||
1087 | done: | |
362d5204 | 1088 | sctp_assoc_rwnd_increase(event->asoc, len); |
1f45f78f | 1089 | sctp_chunk_put(event->chunk); |
d7c2c9e3 TF |
1090 | sctp_ulpevent_release_owner(event); |
1091 | } | |
1092 | ||
1093 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) | |
1094 | { | |
1095 | struct sk_buff *skb, *frag; | |
1096 | ||
1097 | skb = sctp_event2skb(event); | |
1da177e4 LT |
1098 | |
1099 | if (!skb->data_len) | |
1100 | goto done; | |
1101 | ||
1102 | /* Don't forget the fragments. */ | |
1b003be3 | 1103 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
1104 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1105 | * skb's with only 1 level of fragments, SCTP reassembly can | |
1106 | * increase the levels. | |
1107 | */ | |
d7c2c9e3 | 1108 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
1da177e4 LT |
1109 | } |
1110 | ||
1111 | done: | |
1f45f78f | 1112 | sctp_chunk_put(event->chunk); |
1da177e4 LT |
1113 | sctp_ulpevent_release_owner(event); |
1114 | } | |
1115 | ||
1116 | /* Free a ulpevent that has an owner. It includes releasing the reference | |
1117 | * to the owner, updating the rwnd in case of a DATA event and freeing the | |
1118 | * skb. | |
1da177e4 LT |
1119 | */ |
1120 | void sctp_ulpevent_free(struct sctp_ulpevent *event) | |
1121 | { | |
1122 | if (sctp_ulpevent_is_notification(event)) | |
1123 | sctp_ulpevent_release_owner(event); | |
1124 | else | |
1125 | sctp_ulpevent_release_data(event); | |
1126 | ||
1127 | kfree_skb(sctp_event2skb(event)); | |
1128 | } | |
1129 | ||
1130 | /* Purge the skb lists holding ulpevents. */ | |
cd4fcc70 | 1131 | unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
1da177e4 LT |
1132 | { |
1133 | struct sk_buff *skb; | |
cd4fcc70 TG |
1134 | unsigned int data_unread = 0; |
1135 | ||
1136 | while ((skb = skb_dequeue(list)) != NULL) { | |
1137 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
1138 | ||
1139 | if (!sctp_ulpevent_is_notification(event)) | |
1140 | data_unread += skb->len; | |
1141 | ||
1142 | sctp_ulpevent_free(event); | |
1143 | } | |
1144 | ||
1145 | return data_unread; | |
1da177e4 | 1146 | } |