1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* SCTP kernel implementation |
3 | * (C) Copyright IBM Corp. 2001, 2004 |
4 | * Copyright (c) 1999-2000 Cisco, Inc. |
5 | * Copyright (c) 1999-2001 Motorola, Inc. |
6 | * Copyright (c) 2001 Intel Corp. |
7 | * Copyright (c) 2001 Nokia, Inc. |
8 | * Copyright (c) 2001 La Monte H.P. Yarroll |
9 | * |
10 | * These functions manipulate an sctp event. The struct ulpevent is used |
11 | * to carry notifications and data to the ULP (sockets). |
12 | * |
13 | * Please send any bug reports or fixes you make to the |
14 | * email address(es): |
15 | * lksctp developers <linux-sctp@vger.kernel.org> |
16 | * |
17 | * Written or modified by: |
18 | * Jon Grimm <jgrimm@us.ibm.com> |
19 | * La Monte H.P. Yarroll <piggy@acm.org> |
20 | * Ardelle Fan <ardelle.fan@intel.com> |
21 | * Sridhar Samudrala <sri@us.ibm.com> |
22 | */ |
23 | |
24 | #include <linux/slab.h> |
25 | #include <linux/types.h> |
26 | #include <linux/skbuff.h> |
27 | #include <net/sctp/structs.h> |
28 | #include <net/sctp/sctp.h> |
29 | #include <net/sctp/sm.h> |
30 | |
31 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, |
32 | struct sctp_association *asoc); |
33 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event); |
34 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event); |
35 | |
36 | |
37 | /* Initialize an ULP event from an given skb. */ |
38 | static void sctp_ulpevent_init(struct sctp_ulpevent *event, |
39 | __u16 msg_flags, |
40 | unsigned int len) |
41 | { |
42 | memset(event, 0, sizeof(struct sctp_ulpevent)); |
43 | event->msg_flags = msg_flags; |
44 | event->rmem_len = len; |
45 | } |
46 | |
47 | /* Create a new sctp_ulpevent. */ |
48 | static struct sctp_ulpevent *sctp_ulpevent_new(int size, __u16 msg_flags, |
49 | gfp_t gfp) |
50 | { |
51 | struct sctp_ulpevent *event; |
52 | struct sk_buff *skb; |
53 | |
54 | skb = alloc_skb(size, priority: gfp); |
55 | if (!skb) |
56 | goto fail; |
57 | |
58 | event = sctp_skb2event(skb); |
59 | sctp_ulpevent_init(event, msg_flags, len: skb->truesize); |
60 | |
61 | return event; |
62 | |
63 | fail: |
64 | return NULL; |
65 | } |
66 | |
67 | /* Is this a MSG_NOTIFICATION? */ |
68 | int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event) |
69 | { |
70 | return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION); |
71 | } |
72 | |
73 | /* Hold the association in case the msg_name needs read out of |
74 | * the association. |
75 | */ |
76 | static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event, |
77 | const struct sctp_association *asoc) |
78 | { |
79 | struct sctp_chunk *chunk = event->chunk; |
80 | struct sk_buff *skb; |
81 | |
82 | /* Cast away the const, as we are just wanting to |
83 | * bump the reference count. |
84 | */ |
85 | sctp_association_hold((struct sctp_association *)asoc); |
86 | skb = sctp_event2skb(ev: event); |
87 | event->asoc = (struct sctp_association *)asoc; |
88 | atomic_add(i: event->rmem_len, v: &event->asoc->rmem_alloc); |
89 | sctp_skb_set_owner_r(skb, sk: asoc->base.sk); |
90 | if (chunk && chunk->head_skb && !chunk->head_skb->sk) |
91 | chunk->head_skb->sk = asoc->base.sk; |
92 | } |
93 | |
94 | /* A simple destructor to give up the reference to the association. */ |
95 | static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) |
96 | { |
97 | struct sctp_association *asoc = event->asoc; |
98 | |
99 | atomic_sub(i: event->rmem_len, v: &asoc->rmem_alloc); |
100 | sctp_association_put(asoc); |
101 | } |
102 | |
103 | /* Create and initialize an SCTP_ASSOC_CHANGE event. |
104 | * |
105 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
106 | * |
107 | * Communication notifications inform the ULP that an SCTP association |
108 | * has either begun or ended. The identifier for a new association is |
109 | * provided by this notification. |
110 | * |
111 | * Note: There is no field checking here. If a field is unused it will be |
112 | * zero'd out. |
113 | */ |
114 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( |
115 | const struct sctp_association *asoc, |
116 | __u16 flags, __u16 state, __u16 error, __u16 outbound, |
117 | __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp) |
118 | { |
119 | struct sctp_ulpevent *event; |
120 | struct sctp_assoc_change *sac; |
121 | struct sk_buff *skb; |
122 | |
123 | /* If the lower layer passed in the chunk, it will be |
124 | * an ABORT, so we need to include it in the sac_info. |
125 | */ |
126 | if (chunk) { |
127 | /* Copy the chunk data to a new skb and reserve enough |
128 | * head room to use as notification. |
129 | */ |
130 | skb = skb_copy_expand(skb: chunk->skb, |
131 | newheadroom: sizeof(struct sctp_assoc_change), newtailroom: 0, priority: gfp); |
132 | |
133 | if (!skb) |
134 | goto fail; |
135 | |
136 | /* Embed the event fields inside the cloned skb. */ |
137 | event = sctp_skb2event(skb); |
138 | sctp_ulpevent_init(event, MSG_NOTIFICATION, len: skb->truesize); |
139 | |
140 | /* Include the notification structure */ |
141 | sac = skb_push(skb, len: sizeof(struct sctp_assoc_change)); |
142 | |
143 | /* Trim the buffer to the right length. */ |
144 | skb_trim(skb, len: sizeof(struct sctp_assoc_change) + |
145 | ntohs(chunk->chunk_hdr->length) - |
146 | sizeof(struct sctp_chunkhdr)); |
147 | } else { |
148 | event = sctp_ulpevent_new(size: sizeof(struct sctp_assoc_change), |
149 | MSG_NOTIFICATION, gfp); |
150 | if (!event) |
151 | goto fail; |
152 | |
153 | skb = sctp_event2skb(ev: event); |
154 | sac = skb_put(skb, len: sizeof(struct sctp_assoc_change)); |
155 | } |
156 | |
157 | /* Socket Extensions for SCTP |
158 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
159 | * |
160 | * sac_type: |
161 | * It should be SCTP_ASSOC_CHANGE. |
162 | */ |
163 | sac->sac_type = SCTP_ASSOC_CHANGE; |
164 | |
165 | /* Socket Extensions for SCTP |
166 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
167 | * |
168 | * sac_state: 32 bits (signed integer) |
169 | * This field holds one of a number of values that communicate the |
170 | * event that happened to the association. |
171 | */ |
172 | sac->sac_state = state; |
173 | |
174 | /* Socket Extensions for SCTP |
175 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
176 | * |
177 | * sac_flags: 16 bits (unsigned integer) |
178 | * Currently unused. |
179 | */ |
180 | sac->sac_flags = 0; |
181 | |
182 | /* Socket Extensions for SCTP |
183 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
184 | * |
185 | * sac_length: sizeof (__u32) |
186 | * This field is the total length of the notification data, including |
187 | * the notification header. |
188 | */ |
189 | sac->sac_length = skb->len; |
190 | |
191 | /* Socket Extensions for SCTP |
192 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
193 | * |
194 | * sac_error: 32 bits (signed integer) |
195 | * |
196 | * If the state was reached due to a error condition (e.g. |
197 | * COMMUNICATION_LOST) any relevant error information is available in |
198 | * this field. This corresponds to the protocol error codes defined in |
199 | * [SCTP]. |
200 | */ |
201 | sac->sac_error = error; |
202 | |
203 | /* Socket Extensions for SCTP |
204 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
205 | * |
206 | * sac_outbound_streams: 16 bits (unsigned integer) |
207 | * sac_inbound_streams: 16 bits (unsigned integer) |
208 | * |
209 | * The maximum number of streams allowed in each direction are |
210 | * available in sac_outbound_streams and sac_inbound streams. |
211 | */ |
212 | sac->sac_outbound_streams = outbound; |
213 | sac->sac_inbound_streams = inbound; |
214 | |
215 | /* Socket Extensions for SCTP |
216 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
217 | * |
218 | * sac_assoc_id: sizeof (sctp_assoc_t) |
219 | * |
220 | * The association id field, holds the identifier for the association. |
221 | * All notifications for a given association have the same association |
222 | * identifier. For TCP style socket, this field is ignored. |
223 | */ |
224 | sctp_ulpevent_set_owner(event, asoc); |
225 | sac->sac_assoc_id = sctp_assoc2id(asoc); |
226 | |
227 | return event; |
228 | |
229 | fail: |
230 | return NULL; |
231 | } |
232 | |
233 | /* Create and initialize an SCTP_PEER_ADDR_CHANGE event. |
234 | * |
235 | * Socket Extensions for SCTP - draft-01 |
236 | * 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
237 | * |
238 | * When a destination address on a multi-homed peer encounters a change |
239 | * an interface details event is sent. |
240 | */ |
241 | static struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change( |
242 | const struct sctp_association *asoc, |
243 | const struct sockaddr_storage *aaddr, |
244 | int flags, int state, int error, gfp_t gfp) |
245 | { |
246 | struct sctp_ulpevent *event; |
247 | struct sctp_paddr_change *spc; |
248 | struct sk_buff *skb; |
249 | |
250 | event = sctp_ulpevent_new(size: sizeof(struct sctp_paddr_change), |
251 | MSG_NOTIFICATION, gfp); |
252 | if (!event) |
253 | goto fail; |
254 | |
255 | skb = sctp_event2skb(ev: event); |
256 | spc = skb_put(skb, len: sizeof(struct sctp_paddr_change)); |
257 | |
258 | /* Sockets API Extensions for SCTP |
259 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
260 | * |
261 | * spc_type: |
262 | * |
263 | * It should be SCTP_PEER_ADDR_CHANGE. |
264 | */ |
265 | spc->spc_type = SCTP_PEER_ADDR_CHANGE; |
266 | |
267 | /* Sockets API Extensions for SCTP |
268 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
269 | * |
270 | * spc_length: sizeof (__u32) |
271 | * |
272 | * This field is the total length of the notification data, including |
273 | * the notification header. |
274 | */ |
275 | spc->spc_length = sizeof(struct sctp_paddr_change); |
276 | |
277 | /* Sockets API Extensions for SCTP |
278 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
279 | * |
280 | * spc_flags: 16 bits (unsigned integer) |
281 | * Currently unused. |
282 | */ |
283 | spc->spc_flags = 0; |
284 | |
285 | /* Sockets API Extensions for SCTP |
286 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
287 | * |
288 | * spc_state: 32 bits (signed integer) |
289 | * |
290 | * This field holds one of a number of values that communicate the |
291 | * event that happened to the address. |
292 | */ |
293 | spc->spc_state = state; |
294 | |
295 | /* Sockets API Extensions for SCTP |
296 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
297 | * |
298 | * spc_error: 32 bits (signed integer) |
299 | * |
300 | * If the state was reached due to any error condition (e.g. |
301 | * ADDRESS_UNREACHABLE) any relevant error information is available in |
302 | * this field. |
303 | */ |
304 | spc->spc_error = error; |
305 | |
306 | /* Socket Extensions for SCTP |
307 | * 5.3.1.1 SCTP_ASSOC_CHANGE |
308 | * |
309 | * spc_assoc_id: sizeof (sctp_assoc_t) |
310 | * |
311 | * The association id field, holds the identifier for the association. |
312 | * All notifications for a given association have the same association |
313 | * identifier. For TCP style socket, this field is ignored. |
314 | */ |
315 | sctp_ulpevent_set_owner(event, asoc); |
316 | spc->spc_assoc_id = sctp_assoc2id(asoc); |
317 | |
318 | /* Sockets API Extensions for SCTP |
319 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
320 | * |
321 | * spc_aaddr: sizeof (struct sockaddr_storage) |
322 | * |
323 | * The affected address field, holds the remote peer's address that is |
324 | * encountering the change of state. |
325 | */ |
326 | memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage)); |
327 | |
328 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
329 | sctp_get_pf_specific(family: asoc->base.sk->sk_family)->addr_to_user( |
330 | sctp_sk(asoc->base.sk), |
331 | (union sctp_addr *)&spc->spc_aaddr); |
332 | |
333 | return event; |
334 | |
335 | fail: |
336 | return NULL; |
337 | } |
338 | |
339 | void sctp_ulpevent_notify_peer_addr_change(struct sctp_transport *transport, |
340 | int state, int error) |
341 | { |
342 | struct sctp_association *asoc = transport->asoc; |
343 | struct sockaddr_storage addr; |
344 | struct sctp_ulpevent *event; |
345 | |
346 | if (asoc->state < SCTP_STATE_ESTABLISHED) |
347 | return; |
348 | |
349 | memset(&addr, 0, sizeof(struct sockaddr_storage)); |
350 | memcpy(&addr, &transport->ipaddr, transport->af_specific->sockaddr_len); |
351 | |
352 | event = sctp_ulpevent_make_peer_addr_change(asoc, aaddr: &addr, flags: 0, state, |
353 | error, GFP_ATOMIC); |
354 | if (event) |
355 | asoc->stream.si->enqueue_event(&asoc->ulpq, event); |
356 | } |
357 | |
358 | /* Create and initialize an SCTP_REMOTE_ERROR notification. |
359 | * |
360 | * Note: This assumes that the chunk->skb->data already points to the |
361 | * operation error payload. |
362 | * |
363 | * Socket Extensions for SCTP - draft-01 |
364 | * 5.3.1.3 SCTP_REMOTE_ERROR |
365 | * |
366 | * A remote peer may send an Operational Error message to its peer. |
367 | * This message indicates a variety of error conditions on an |
368 | * association. The entire error TLV as it appears on the wire is |
369 | * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP |
370 | * specification [SCTP] and any extensions for a list of possible |
371 | * error formats. |
372 | */ |
373 | struct sctp_ulpevent * |
374 | sctp_ulpevent_make_remote_error(const struct sctp_association *asoc, |
375 | struct sctp_chunk *chunk, __u16 flags, |
376 | gfp_t gfp) |
377 | { |
378 | struct sctp_remote_error *sre; |
379 | struct sctp_ulpevent *event; |
380 | struct sctp_errhdr *ch; |
381 | struct sk_buff *skb; |
382 | __be16 cause; |
383 | int elen; |
384 | |
385 | ch = (struct sctp_errhdr *)(chunk->skb->data); |
386 | cause = ch->cause; |
387 | elen = SCTP_PAD4(ntohs(ch->length)) - sizeof(*ch); |
388 | |
389 | /* Pull off the ERROR header. */ |
390 | skb_pull(skb: chunk->skb, len: sizeof(*ch)); |
391 | |
392 | /* Copy the skb to a new skb with room for us to prepend |
393 | * notification with. |
394 | */ |
395 | skb = skb_copy_expand(skb: chunk->skb, newheadroom: sizeof(*sre), newtailroom: 0, priority: gfp); |
396 | |
397 | /* Pull off the rest of the cause TLV from the chunk. */ |
398 | skb_pull(skb: chunk->skb, len: elen); |
399 | if (!skb) |
400 | goto fail; |
401 | |
402 | /* Embed the event fields inside the cloned skb. */ |
403 | event = sctp_skb2event(skb); |
404 | sctp_ulpevent_init(event, MSG_NOTIFICATION, len: skb->truesize); |
405 | |
406 | sre = skb_push(skb, len: sizeof(*sre)); |
407 | |
408 | /* Trim the buffer to the right length. */ |
409 | skb_trim(skb, len: sizeof(*sre) + elen); |
410 | |
411 | /* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */ |
412 | memset(sre, 0, sizeof(*sre)); |
413 | sre->sre_type = SCTP_REMOTE_ERROR; |
414 | sre->sre_flags = 0; |
415 | sre->sre_length = skb->len; |
416 | sre->sre_error = cause; |
417 | sctp_ulpevent_set_owner(event, asoc); |
418 | sre->sre_assoc_id = sctp_assoc2id(asoc); |
419 | |
420 | return event; |
421 | fail: |
422 | return NULL; |
423 | } |
424 | |
425 | /* Create and initialize a SCTP_SEND_FAILED notification. |
426 | * |
427 | * Socket Extensions for SCTP - draft-01 |
428 | * 5.3.1.4 SCTP_SEND_FAILED |
429 | */ |
430 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( |
431 | const struct sctp_association *asoc, struct sctp_chunk *chunk, |
432 | __u16 flags, __u32 error, gfp_t gfp) |
433 | { |
434 | struct sctp_ulpevent *event; |
435 | struct sctp_send_failed *ssf; |
436 | struct sk_buff *skb; |
437 | |
438 | /* Pull off any padding. */ |
439 | int len = ntohs(chunk->chunk_hdr->length); |
440 | |
441 | /* Make skb with more room so we can prepend notification. */ |
442 | skb = skb_copy_expand(skb: chunk->skb, |
443 | newheadroom: sizeof(struct sctp_send_failed), /* headroom */ |
444 | newtailroom: 0, /* tailroom */ |
445 | priority: gfp); |
446 | if (!skb) |
447 | goto fail; |
448 | |
449 | /* Pull off the common chunk header and DATA header. */ |
450 | skb_pull(skb, len: sctp_datachk_len(stream: &asoc->stream)); |
451 | len -= sctp_datachk_len(stream: &asoc->stream); |
452 | |
453 | /* Embed the event fields inside the cloned skb. */ |
454 | event = sctp_skb2event(skb); |
455 | sctp_ulpevent_init(event, MSG_NOTIFICATION, len: skb->truesize); |
456 | |
457 | ssf = skb_push(skb, len: sizeof(struct sctp_send_failed)); |
458 | |
459 | /* Socket Extensions for SCTP |
460 | * 5.3.1.4 SCTP_SEND_FAILED |
461 | * |
462 | * ssf_type: |
463 | * It should be SCTP_SEND_FAILED. |
464 | */ |
465 | ssf->ssf_type = SCTP_SEND_FAILED; |
466 | |
467 | /* Socket Extensions for SCTP |
468 | * 5.3.1.4 SCTP_SEND_FAILED |
469 | * |
470 | * ssf_flags: 16 bits (unsigned integer) |
471 | * The flag value will take one of the following values |
472 | * |
473 | * SCTP_DATA_UNSENT - Indicates that the data was never put on |
474 | * the wire. |
475 | * |
476 | * SCTP_DATA_SENT - Indicates that the data was put on the wire. |
477 | * Note that this does not necessarily mean that the |
478 | * data was (or was not) successfully delivered. |
479 | */ |
480 | ssf->ssf_flags = flags; |
481 | |
482 | /* Socket Extensions for SCTP |
483 | * 5.3.1.4 SCTP_SEND_FAILED |
484 | * |
485 | * ssf_length: sizeof (__u32) |
486 | * This field is the total length of the notification data, including |
487 | * the notification header. |
488 | */ |
489 | ssf->ssf_length = sizeof(struct sctp_send_failed) + len; |
490 | skb_trim(skb, len: ssf->ssf_length); |
491 | |
492 | /* Socket Extensions for SCTP |
493 | * 5.3.1.4 SCTP_SEND_FAILED |
494 | * |
495 | * ssf_error: 16 bits (unsigned integer) |
496 | * This value represents the reason why the send failed, and if set, |
497 | * will be a SCTP protocol error code as defined in [SCTP] section |
498 | * 3.3.10. |
499 | */ |
500 | ssf->ssf_error = error; |
501 | |
502 | /* Socket Extensions for SCTP |
503 | * 5.3.1.4 SCTP_SEND_FAILED |
504 | * |
505 | * ssf_info: sizeof (struct sctp_sndrcvinfo) |
506 | * The original send information associated with the undelivered |
507 | * message. |
508 | */ |
509 | memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); |
510 | |
511 | /* Per TSVWG discussion with Randy. Allow the application to |
512 | * reassemble a fragmented message. |
513 | */ |
514 | ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; |
515 | |
516 | /* Socket Extensions for SCTP |
517 | * 5.3.1.4 SCTP_SEND_FAILED |
518 | * |
519 | * ssf_assoc_id: sizeof (sctp_assoc_t) |
520 | * The association id field, sf_assoc_id, holds the identifier for the |
521 | * association. All notifications for a given association have the |
522 | * same association identifier. For TCP style socket, this field is |
523 | * ignored. |
524 | */ |
525 | sctp_ulpevent_set_owner(event, asoc); |
526 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); |
527 | return event; |
528 | |
529 | fail: |
530 | return NULL; |
531 | } |
532 | |
533 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed_event( |
534 | const struct sctp_association *asoc, struct sctp_chunk *chunk, |
535 | __u16 flags, __u32 error, gfp_t gfp) |
536 | { |
537 | struct sctp_send_failed_event *ssf; |
538 | struct sctp_ulpevent *event; |
539 | struct sk_buff *skb; |
540 | int len; |
541 | |
542 | skb = skb_copy_expand(skb: chunk->skb, newheadroom: sizeof(*ssf), newtailroom: 0, priority: gfp); |
543 | if (!skb) |
544 | return NULL; |
545 | |
546 | len = ntohs(chunk->chunk_hdr->length); |
547 | len -= sctp_datachk_len(stream: &asoc->stream); |
548 | |
549 | skb_pull(skb, len: sctp_datachk_len(stream: &asoc->stream)); |
550 | event = sctp_skb2event(skb); |
551 | sctp_ulpevent_init(event, MSG_NOTIFICATION, len: skb->truesize); |
552 | |
553 | ssf = skb_push(skb, len: sizeof(*ssf)); |
554 | ssf->ssf_type = SCTP_SEND_FAILED_EVENT; |
555 | ssf->ssf_flags = flags; |
556 | ssf->ssf_length = sizeof(*ssf) + len; |
557 | skb_trim(skb, len: ssf->ssf_length); |
558 | ssf->ssf_error = error; |
559 | |
560 | ssf->ssfe_info.snd_sid = chunk->sinfo.sinfo_stream; |
561 | ssf->ssfe_info.snd_ppid = chunk->sinfo.sinfo_ppid; |
562 | ssf->ssfe_info.snd_context = chunk->sinfo.sinfo_context; |
563 | ssf->ssfe_info.snd_assoc_id = chunk->sinfo.sinfo_assoc_id; |
564 | ssf->ssfe_info.snd_flags = chunk->chunk_hdr->flags; |
565 | |
566 | sctp_ulpevent_set_owner(event, asoc); |
567 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); |
568 | |
569 | return event; |
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, |
579 | __u16 flags, gfp_t gfp) |
580 | { |
581 | struct sctp_ulpevent *event; |
582 | struct sctp_shutdown_event *sse; |
583 | struct sk_buff *skb; |
584 | |
585 | event = sctp_ulpevent_new(size: sizeof(struct sctp_shutdown_event), |
586 | MSG_NOTIFICATION, gfp); |
587 | if (!event) |
588 | goto fail; |
589 | |
590 | skb = sctp_event2skb(ev: event); |
591 | sse = skb_put(skb, len: sizeof(struct sctp_shutdown_event)); |
592 | |
593 | /* Socket Extensions for SCTP |
594 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
595 | * |
596 | * sse_type |
597 | * It should be SCTP_SHUTDOWN_EVENT |
598 | */ |
599 | sse->sse_type = SCTP_SHUTDOWN_EVENT; |
600 | |
601 | /* Socket Extensions for SCTP |
602 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
603 | * |
604 | * sse_flags: 16 bits (unsigned integer) |
605 | * Currently unused. |
606 | */ |
607 | sse->sse_flags = 0; |
608 | |
609 | /* Socket Extensions for SCTP |
610 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
611 | * |
612 | * sse_length: sizeof (__u32) |
613 | * This field is the total length of the notification data, including |
614 | * the notification header. |
615 | */ |
616 | sse->sse_length = sizeof(struct sctp_shutdown_event); |
617 | |
618 | /* Socket Extensions for SCTP |
619 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
620 | * |
621 | * sse_assoc_id: sizeof (sctp_assoc_t) |
622 | * The association id field, holds the identifier for the association. |
623 | * All notifications for a given association have the same association |
624 | * identifier. For TCP style socket, this field is ignored. |
625 | */ |
626 | sctp_ulpevent_set_owner(event, asoc); |
627 | sse->sse_assoc_id = sctp_assoc2id(asoc); |
628 | |
629 | return event; |
630 | |
631 | fail: |
632 | return NULL; |
633 | } |
634 | |
635 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
636 | * |
637 | * Socket Extensions for SCTP |
638 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
639 | */ |
640 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
641 | const struct sctp_association *asoc, gfp_t gfp) |
642 | { |
643 | struct sctp_ulpevent *event; |
644 | struct sctp_adaptation_event *sai; |
645 | struct sk_buff *skb; |
646 | |
647 | event = sctp_ulpevent_new(size: sizeof(struct sctp_adaptation_event), |
648 | MSG_NOTIFICATION, gfp); |
649 | if (!event) |
650 | goto fail; |
651 | |
652 | skb = sctp_event2skb(ev: event); |
653 | sai = skb_put(skb, len: sizeof(struct sctp_adaptation_event)); |
654 | |
655 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
656 | sai->sai_flags = 0; |
657 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
658 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; |
659 | sctp_ulpevent_set_owner(event, asoc); |
660 | sai->sai_assoc_id = sctp_assoc2id(asoc); |
661 | |
662 | return event; |
663 | |
664 | fail: |
665 | return NULL; |
666 | } |
667 | |
668 | /* A message has been received. Package this message as a notification |
669 | * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo |
670 | * even if filtered out later. |
671 | * |
672 | * Socket Extensions for SCTP |
673 | * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
674 | */ |
675 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, |
676 | struct sctp_chunk *chunk, |
677 | gfp_t gfp) |
678 | { |
679 | struct sctp_ulpevent *event = NULL; |
680 | struct sk_buff *skb = chunk->skb; |
681 | struct sock *sk = asoc->base.sk; |
682 | size_t padding, datalen; |
683 | int rx_count; |
684 | |
685 | /* |
686 | * check to see if we need to make space for this |
687 | * new skb, expand the rcvbuffer if needed, or drop |
688 | * the frame |
689 | */ |
690 | if (asoc->ep->rcvbuf_policy) |
691 | rx_count = atomic_read(v: &asoc->rmem_alloc); |
692 | else |
693 | rx_count = atomic_read(v: &sk->sk_rmem_alloc); |
694 | |
695 | datalen = ntohs(chunk->chunk_hdr->length); |
696 | |
697 | if (rx_count >= sk->sk_rcvbuf || !sk_rmem_schedule(sk, skb, size: datalen)) |
698 | goto fail; |
699 | |
700 | /* Clone the original skb, sharing the data. */ |
701 | skb = skb_clone(skb: chunk->skb, priority: gfp); |
702 | if (!skb) |
703 | goto fail; |
704 | |
705 | /* Now that all memory allocations for this chunk succeeded, we |
706 | * can mark it as received so the tsn_map is updated correctly. |
707 | */ |
708 | if (sctp_tsnmap_mark(&asoc->peer.tsn_map, |
709 | ntohl(chunk->subh.data_hdr->tsn), |
710 | trans: chunk->transport)) |
711 | goto fail_mark; |
712 | |
713 | /* First calculate the padding, so we don't inadvertently |
714 | * pass up the wrong length to the user. |
715 | * |
716 | * RFC 2960 - Section 3.2 Chunk Field Descriptions |
717 | * |
718 | * The total length of a chunk(including Type, Length and Value fields) |
719 | * MUST be a multiple of 4 bytes. If the length of the chunk is not a |
720 | * multiple of 4 bytes, the sender MUST pad the chunk with all zero |
721 | * bytes and this padding is not included in the chunk length field. |
722 | * The sender should never pad with more than 3 bytes. The receiver |
723 | * MUST ignore the padding bytes. |
724 | */ |
725 | padding = SCTP_PAD4(datalen) - datalen; |
726 | |
727 | /* Fixup cloned skb with just this chunks data. */ |
728 | skb_trim(skb, len: chunk->chunk_end - padding - skb->data); |
729 | |
730 | /* Embed the event fields inside the cloned skb. */ |
731 | event = sctp_skb2event(skb); |
732 | |
733 | /* Initialize event with flags 0 and correct length |
734 | * Since this is a clone of the original skb, only account for |
735 | * the data of this chunk as other chunks will be accounted separately. |
736 | */ |
737 | sctp_ulpevent_init(event, msg_flags: 0, len: skb->len + sizeof(struct sk_buff)); |
738 | |
739 | /* And hold the chunk as we need it for getting the IP headers |
740 | * later in recvmsg |
741 | */ |
742 | sctp_chunk_hold(chunk); |
743 | event->chunk = chunk; |
744 | |
745 | sctp_ulpevent_receive_data(event, asoc); |
746 | |
747 | event->stream = ntohs(chunk->subh.data_hdr->stream); |
748 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
749 | event->flags |= SCTP_UNORDERED; |
750 | event->cumtsn = sctp_tsnmap_get_ctsn(map: &asoc->peer.tsn_map); |
751 | } |
752 | event->tsn = ntohl(chunk->subh.data_hdr->tsn); |
753 | event->msg_flags |= chunk->chunk_hdr->flags; |
754 | |
755 | return event; |
756 | |
757 | fail_mark: |
758 | kfree_skb(skb); |
759 | fail: |
760 | return NULL; |
761 | } |
762 | |
763 | /* Create a partial delivery related event. |
764 | * |
765 | * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT |
766 | * |
767 | * When a receiver is engaged in a partial delivery of a |
768 | * message this notification will be used to indicate |
769 | * various events. |
770 | */ |
771 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( |
772 | const struct sctp_association *asoc, |
773 | __u32 indication, __u32 sid, __u32 seq, |
774 | __u32 flags, gfp_t gfp) |
775 | { |
776 | struct sctp_ulpevent *event; |
777 | struct sctp_pdapi_event *pd; |
778 | struct sk_buff *skb; |
779 | |
780 | event = sctp_ulpevent_new(size: sizeof(struct sctp_pdapi_event), |
781 | MSG_NOTIFICATION, gfp); |
782 | if (!event) |
783 | goto fail; |
784 | |
785 | skb = sctp_event2skb(ev: event); |
786 | pd = skb_put(skb, len: sizeof(struct sctp_pdapi_event)); |
787 | |
788 | /* pdapi_type |
789 | * It should be SCTP_PARTIAL_DELIVERY_EVENT |
790 | * |
791 | * pdapi_flags: 16 bits (unsigned integer) |
792 | * Currently unused. |
793 | */ |
794 | pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; |
795 | pd->pdapi_flags = flags; |
796 | pd->pdapi_stream = sid; |
797 | pd->pdapi_seq = seq; |
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 | |
807 | /* pdapi_indication: 32 bits (unsigned integer) |
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 | |
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(size: sizeof(struct sctp_authkey_event), |
834 | MSG_NOTIFICATION, gfp); |
835 | if (!event) |
836 | goto fail; |
837 | |
838 | skb = sctp_event2skb(ev: event); |
839 | ak = skb_put(skb, len: sizeof(struct sctp_authkey_event)); |
840 | |
841 | ak->auth_type = SCTP_AUTHENTICATION_EVENT; |
842 | ak->auth_flags = 0; |
843 | ak->auth_length = sizeof(struct sctp_authkey_event); |
844 | |
845 | ak->auth_keynumber = key_id; |
846 | ak->auth_altkeynumber = 0; |
847 | ak->auth_indication = indication; |
848 | |
849 | /* |
850 | * The association id field, holds the identifier for the association. |
851 | */ |
852 | sctp_ulpevent_set_owner(event, asoc); |
853 | ak->auth_assoc_id = sctp_assoc2id(asoc); |
854 | |
855 | return event; |
856 | fail: |
857 | return NULL; |
858 | } |
859 | |
860 | /* |
861 | * Socket Extensions for SCTP |
862 | * 6.3.10. SCTP_SENDER_DRY_EVENT |
863 | */ |
864 | struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event( |
865 | const struct sctp_association *asoc, gfp_t gfp) |
866 | { |
867 | struct sctp_ulpevent *event; |
868 | struct sctp_sender_dry_event *sdry; |
869 | struct sk_buff *skb; |
870 | |
871 | event = sctp_ulpevent_new(size: sizeof(struct sctp_sender_dry_event), |
872 | MSG_NOTIFICATION, gfp); |
873 | if (!event) |
874 | return NULL; |
875 | |
876 | skb = sctp_event2skb(ev: event); |
877 | sdry = skb_put(skb, len: sizeof(struct sctp_sender_dry_event)); |
878 | |
879 | sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT; |
880 | sdry->sender_dry_flags = 0; |
881 | sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event); |
882 | sctp_ulpevent_set_owner(event, asoc); |
883 | sdry->sender_dry_assoc_id = sctp_assoc2id(asoc); |
884 | |
885 | return event; |
886 | } |
887 | |
888 | struct sctp_ulpevent *sctp_ulpevent_make_stream_reset_event( |
889 | const struct sctp_association *asoc, __u16 flags, __u16 stream_num, |
890 | __be16 *stream_list, gfp_t gfp) |
891 | { |
892 | struct sctp_stream_reset_event *sreset; |
893 | struct sctp_ulpevent *event; |
894 | struct sk_buff *skb; |
895 | int length, i; |
896 | |
897 | length = sizeof(struct sctp_stream_reset_event) + 2 * stream_num; |
898 | event = sctp_ulpevent_new(size: length, MSG_NOTIFICATION, gfp); |
899 | if (!event) |
900 | return NULL; |
901 | |
902 | skb = sctp_event2skb(ev: event); |
903 | sreset = skb_put(skb, len: length); |
904 | |
905 | sreset->strreset_type = SCTP_STREAM_RESET_EVENT; |
906 | sreset->strreset_flags = flags; |
907 | sreset->strreset_length = length; |
908 | sctp_ulpevent_set_owner(event, asoc); |
909 | sreset->strreset_assoc_id = sctp_assoc2id(asoc); |
910 | |
911 | for (i = 0; i < stream_num; i++) |
912 | sreset->strreset_stream_list[i] = ntohs(stream_list[i]); |
913 | |
914 | return event; |
915 | } |
916 | |
917 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event( |
918 | const struct sctp_association *asoc, __u16 flags, __u32 local_tsn, |
919 | __u32 remote_tsn, gfp_t gfp) |
920 | { |
921 | struct sctp_assoc_reset_event *areset; |
922 | struct sctp_ulpevent *event; |
923 | struct sk_buff *skb; |
924 | |
925 | event = sctp_ulpevent_new(size: sizeof(struct sctp_assoc_reset_event), |
926 | MSG_NOTIFICATION, gfp); |
927 | if (!event) |
928 | return NULL; |
929 | |
930 | skb = sctp_event2skb(ev: event); |
931 | areset = skb_put(skb, len: sizeof(struct sctp_assoc_reset_event)); |
932 | |
933 | areset->assocreset_type = SCTP_ASSOC_RESET_EVENT; |
934 | areset->assocreset_flags = flags; |
935 | areset->assocreset_length = sizeof(struct sctp_assoc_reset_event); |
936 | sctp_ulpevent_set_owner(event, asoc); |
937 | areset->assocreset_assoc_id = sctp_assoc2id(asoc); |
938 | areset->assocreset_local_tsn = local_tsn; |
939 | areset->assocreset_remote_tsn = remote_tsn; |
940 | |
941 | return event; |
942 | } |
943 | |
944 | struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event( |
945 | const struct sctp_association *asoc, __u16 flags, |
946 | __u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp) |
947 | { |
948 | struct sctp_stream_change_event *schange; |
949 | struct sctp_ulpevent *event; |
950 | struct sk_buff *skb; |
951 | |
952 | event = sctp_ulpevent_new(size: sizeof(struct sctp_stream_change_event), |
953 | MSG_NOTIFICATION, gfp); |
954 | if (!event) |
955 | return NULL; |
956 | |
957 | skb = sctp_event2skb(ev: event); |
958 | schange = skb_put(skb, len: sizeof(struct sctp_stream_change_event)); |
959 | |
960 | schange->strchange_type = SCTP_STREAM_CHANGE_EVENT; |
961 | schange->strchange_flags = flags; |
962 | schange->strchange_length = sizeof(struct sctp_stream_change_event); |
963 | sctp_ulpevent_set_owner(event, asoc); |
964 | schange->strchange_assoc_id = sctp_assoc2id(asoc); |
965 | schange->strchange_instrms = strchange_instrms; |
966 | schange->strchange_outstrms = strchange_outstrms; |
967 | |
968 | return event; |
969 | } |
970 | |
971 | /* Return the notification type, assuming this is a notification |
972 | * event. |
973 | */ |
974 | __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) |
975 | { |
976 | union sctp_notification *notification; |
977 | struct sk_buff *skb; |
978 | |
979 | skb = sctp_event2skb(ev: event); |
980 | notification = (union sctp_notification *) skb->data; |
981 | return notification->sn_header.sn_type; |
982 | } |
983 | |
984 | /* RFC6458, Section 5.3.2. SCTP Header Information Structure |
985 | * (SCTP_SNDRCV, DEPRECATED) |
986 | */ |
987 | void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, |
988 | struct msghdr *msghdr) |
989 | { |
990 | struct sctp_sndrcvinfo sinfo; |
991 | |
992 | if (sctp_ulpevent_is_notification(event)) |
993 | return; |
994 | |
995 | memset(&sinfo, 0, sizeof(sinfo)); |
996 | sinfo.sinfo_stream = event->stream; |
997 | sinfo.sinfo_ssn = event->ssn; |
998 | sinfo.sinfo_ppid = event->ppid; |
999 | sinfo.sinfo_flags = event->flags; |
1000 | sinfo.sinfo_tsn = event->tsn; |
1001 | sinfo.sinfo_cumtsn = event->cumtsn; |
1002 | sinfo.sinfo_assoc_id = sctp_assoc2id(asoc: event->asoc); |
1003 | /* Context value that is set via SCTP_CONTEXT socket option. */ |
1004 | sinfo.sinfo_context = event->asoc->default_rcv_context; |
1005 | /* These fields are not used while receiving. */ |
1006 | sinfo.sinfo_timetolive = 0; |
1007 | |
1008 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, |
1009 | len: sizeof(sinfo), data: &sinfo); |
1010 | } |
1011 | |
1012 | /* RFC6458, Section 5.3.5 SCTP Receive Information Structure |
1013 | * (SCTP_SNDRCV) |
1014 | */ |
1015 | void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event, |
1016 | struct msghdr *msghdr) |
1017 | { |
1018 | struct sctp_rcvinfo rinfo; |
1019 | |
1020 | if (sctp_ulpevent_is_notification(event)) |
1021 | return; |
1022 | |
1023 | memset(&rinfo, 0, sizeof(struct sctp_rcvinfo)); |
1024 | rinfo.rcv_sid = event->stream; |
1025 | rinfo.rcv_ssn = event->ssn; |
1026 | rinfo.rcv_ppid = event->ppid; |
1027 | rinfo.rcv_flags = event->flags; |
1028 | rinfo.rcv_tsn = event->tsn; |
1029 | rinfo.rcv_cumtsn = event->cumtsn; |
1030 | rinfo.rcv_assoc_id = sctp_assoc2id(asoc: event->asoc); |
1031 | rinfo.rcv_context = event->asoc->default_rcv_context; |
1032 | |
1033 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO, |
1034 | len: sizeof(rinfo), data: &rinfo); |
1035 | } |
1036 | |
1037 | /* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure |
1038 | * (SCTP_NXTINFO) |
1039 | */ |
1040 | static void __sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event, |
1041 | struct msghdr *msghdr, |
1042 | const struct sk_buff *skb) |
1043 | { |
1044 | struct sctp_nxtinfo nxtinfo; |
1045 | |
1046 | memset(&nxtinfo, 0, sizeof(nxtinfo)); |
1047 | nxtinfo.nxt_sid = event->stream; |
1048 | nxtinfo.nxt_ppid = event->ppid; |
1049 | nxtinfo.nxt_flags = event->flags; |
1050 | if (sctp_ulpevent_is_notification(event)) |
1051 | nxtinfo.nxt_flags |= SCTP_NOTIFICATION; |
1052 | nxtinfo.nxt_length = skb->len; |
1053 | nxtinfo.nxt_assoc_id = sctp_assoc2id(asoc: event->asoc); |
1054 | |
1055 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO, |
1056 | len: sizeof(nxtinfo), data: &nxtinfo); |
1057 | } |
1058 | |
1059 | void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event, |
1060 | struct msghdr *msghdr, |
1061 | struct sock *sk) |
1062 | { |
1063 | struct sk_buff *skb; |
1064 | int err; |
1065 | |
1066 | skb = sctp_skb_recv_datagram(sk, MSG_PEEK | MSG_DONTWAIT, &err); |
1067 | if (skb != NULL) { |
1068 | __sctp_ulpevent_read_nxtinfo(event: sctp_skb2event(skb), |
1069 | msghdr, skb); |
1070 | /* Just release refcount here. */ |
1071 | kfree_skb(skb); |
1072 | } |
1073 | } |
1074 | |
1075 | /* Do accounting for bytes received and hold a reference to the association |
1076 | * for each skb. |
1077 | */ |
1078 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, |
1079 | struct sctp_association *asoc) |
1080 | { |
1081 | struct sk_buff *skb, *frag; |
1082 | |
1083 | skb = sctp_event2skb(ev: event); |
1084 | /* Set the owner and charge rwnd for bytes received. */ |
1085 | sctp_ulpevent_set_owner(event, asoc); |
1086 | sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); |
1087 | |
1088 | if (!skb->data_len) |
1089 | return; |
1090 | |
1091 | /* Note: Not clearing the entire event struct as this is just a |
1092 | * fragment of the real event. However, we still need to do rwnd |
1093 | * accounting. |
1094 | * In general, the skb passed from IP can have only 1 level of |
1095 | * fragments. But we allow multiple levels of fragments. |
1096 | */ |
1097 | skb_walk_frags(skb, frag) |
1098 | sctp_ulpevent_receive_data(event: sctp_skb2event(skb: frag), asoc); |
1099 | } |
1100 | |
1101 | /* Do accounting for bytes just read by user and release the references to |
1102 | * the association. |
1103 | */ |
1104 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
1105 | { |
1106 | struct sk_buff *skb, *frag; |
1107 | unsigned int len; |
1108 | |
1109 | /* Current stack structures assume that the rcv buffer is |
1110 | * per socket. For UDP style sockets this is not true as |
1111 | * multiple associations may be on a single UDP-style socket. |
1112 | * Use the local private area of the skb to track the owning |
1113 | * association. |
1114 | */ |
1115 | |
1116 | skb = sctp_event2skb(ev: event); |
1117 | len = skb->len; |
1118 | |
1119 | if (!skb->data_len) |
1120 | goto done; |
1121 | |
1122 | /* Don't forget the fragments. */ |
1123 | skb_walk_frags(skb, frag) { |
1124 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1125 | * skb's with only 1 level of fragments, SCTP reassembly can |
1126 | * increase the levels. |
1127 | */ |
1128 | sctp_ulpevent_release_frag_data(event: sctp_skb2event(skb: frag)); |
1129 | } |
1130 | |
1131 | done: |
1132 | sctp_assoc_rwnd_increase(event->asoc, len); |
1133 | sctp_chunk_put(event->chunk); |
1134 | sctp_ulpevent_release_owner(event); |
1135 | } |
1136 | |
1137 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) |
1138 | { |
1139 | struct sk_buff *skb, *frag; |
1140 | |
1141 | skb = sctp_event2skb(ev: event); |
1142 | |
1143 | if (!skb->data_len) |
1144 | goto done; |
1145 | |
1146 | /* Don't forget the fragments. */ |
1147 | skb_walk_frags(skb, frag) { |
1148 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1149 | * skb's with only 1 level of fragments, SCTP reassembly can |
1150 | * increase the levels. |
1151 | */ |
1152 | sctp_ulpevent_release_frag_data(event: sctp_skb2event(skb: frag)); |
1153 | } |
1154 | |
1155 | done: |
1156 | sctp_chunk_put(event->chunk); |
1157 | sctp_ulpevent_release_owner(event); |
1158 | } |
1159 | |
1160 | /* Free a ulpevent that has an owner. It includes releasing the reference |
1161 | * to the owner, updating the rwnd in case of a DATA event and freeing the |
1162 | * skb. |
1163 | */ |
1164 | void sctp_ulpevent_free(struct sctp_ulpevent *event) |
1165 | { |
1166 | if (sctp_ulpevent_is_notification(event)) |
1167 | sctp_ulpevent_release_owner(event); |
1168 | else |
1169 | sctp_ulpevent_release_data(event); |
1170 | |
1171 | kfree_skb(skb: sctp_event2skb(ev: event)); |
1172 | } |
1173 | |
1174 | /* Purge the skb lists holding ulpevents. */ |
1175 | unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
1176 | { |
1177 | struct sk_buff *skb; |
1178 | unsigned int data_unread = 0; |
1179 | |
1180 | while ((skb = skb_dequeue(list)) != NULL) { |
1181 | struct sctp_ulpevent *event = sctp_skb2event(skb); |
1182 | |
1183 | if (!sctp_ulpevent_is_notification(event)) |
1184 | data_unread += skb->len; |
1185 | |
1186 | sctp_ulpevent_free(event); |
1187 | } |
1188 | |
1189 | return data_unread; |
1190 | } |
1191 | |