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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
31static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
32 struct sctp_association *asoc);
33static void sctp_ulpevent_release_data(struct sctp_ulpevent *event);
34static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event);
35
36
37/* Initialize an ULP event from an given skb. */
38static 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. */
48static 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, gfp);
55 if (!skb)
56 goto fail;
57
58 event = sctp_skb2event(skb);
59 sctp_ulpevent_init(event, msg_flags, skb->truesize);
60
61 return event;
62
63fail:
64 return NULL;
65}
66
67/* Is this a MSG_NOTIFICATION? */
68int 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 */
76static 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(event);
87 event->asoc = (struct sctp_association *)asoc;
88 atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
89 sctp_skb_set_owner_r(skb, 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. */
95static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event)
96{
97 struct sctp_association *asoc = event->asoc;
98
99 atomic_sub(event->rmem_len, &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 */
114struct 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(chunk->skb,
131 sizeof(struct sctp_assoc_change), 0, 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, skb->truesize);
139
140 /* Include the notification structure */
141 sac = skb_push(skb, sizeof(struct sctp_assoc_change));
142
143 /* Trim the buffer to the right length. */
144 skb_trim(skb, sizeof(struct sctp_assoc_change) +
145 ntohs(chunk->chunk_hdr->length) -
146 sizeof(struct sctp_chunkhdr));
147 } else {
148 event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
149 MSG_NOTIFICATION, gfp);
150 if (!event)
151 goto fail;
152
153 skb = sctp_event2skb(event);
154 sac = skb_put(skb, 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
229fail:
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 */
241static 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(sizeof(struct sctp_paddr_change),
251 MSG_NOTIFICATION, gfp);
252 if (!event)
253 goto fail;
254
255 skb = sctp_event2skb(event);
256 spc = skb_put(skb, 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(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
335fail:
336 return NULL;
337}
338
339void 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, &addr, 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 */
373struct sctp_ulpevent *
374sctp_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(chunk->skb, 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(chunk->skb, sizeof(*sre), 0, gfp);
396
397 /* Pull off the rest of the cause TLV from the chunk. */
398 skb_pull(chunk->skb, 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, skb->truesize);
405
406 sre = skb_push(skb, sizeof(*sre));
407
408 /* Trim the buffer to the right length. */
409 skb_trim(skb, 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;
421fail:
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 */
430struct 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(chunk->skb,
443 sizeof(struct sctp_send_failed), /* headroom */
444 0, /* tailroom */
445 gfp);
446 if (!skb)
447 goto fail;
448
449 /* Pull off the common chunk header and DATA header. */
450 skb_pull(skb, sctp_datachk_len(&asoc->stream));
451 len -= sctp_datachk_len(&asoc->stream);
452
453 /* Embed the event fields inside the cloned skb. */
454 event = sctp_skb2event(skb);
455 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
456
457 ssf = skb_push(skb, 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, 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
529fail:
530 return NULL;
531}
532
533struct 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(chunk->skb, sizeof(*ssf), 0, gfp);
543 if (!skb)
544 return NULL;
545
546 len = ntohs(chunk->chunk_hdr->length);
547 len -= sctp_datachk_len(&asoc->stream);
548
549 skb_pull(skb, sctp_datachk_len(&asoc->stream));
550 event = sctp_skb2event(skb);
551 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
552
553 ssf = skb_push(skb, 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, 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 */
577struct 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(sizeof(struct sctp_shutdown_event),
586 MSG_NOTIFICATION, gfp);
587 if (!event)
588 goto fail;
589
590 skb = sctp_event2skb(event);
591 sse = skb_put(skb, sizeof(struct sctp_shutdown_event));
592
593 /* Socket Extensions for SCTP
594 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
595 *
596 * sse_type
597 * It should be SCTP_SHUTDOWN_EVENT
598 */
599 sse->sse_type = SCTP_SHUTDOWN_EVENT;
600
601 /* Socket Extensions for SCTP
602 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
603 *
604 * sse_flags: 16 bits (unsigned integer)
605 * Currently unused.
606 */
607 sse->sse_flags = 0;
608
609 /* Socket Extensions for SCTP
610 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
611 *
612 * sse_length: sizeof (__u32)
613 * This field is the total length of the notification data, including
614 * the notification header.
615 */
616 sse->sse_length = sizeof(struct sctp_shutdown_event);
617
618 /* Socket Extensions for SCTP
619 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
620 *
621 * sse_assoc_id: sizeof (sctp_assoc_t)
622 * The association id field, holds the identifier for the association.
623 * All notifications for a given association have the same association
624 * identifier. For TCP style socket, this field is ignored.
625 */
626 sctp_ulpevent_set_owner(event, asoc);
627 sse->sse_assoc_id = sctp_assoc2id(asoc);
628
629 return event;
630
631fail:
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 */
640struct 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(sizeof(struct sctp_adaptation_event),
648 MSG_NOTIFICATION, gfp);
649 if (!event)
650 goto fail;
651
652 skb = sctp_event2skb(event);
653 sai = skb_put(skb, 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
664fail:
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 */
675struct 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(&asoc->rmem_alloc);
692 else
693 rx_count = atomic_read(&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, datalen))
698 goto fail;
699
700 /* Clone the original skb, sharing the data. */
701 skb = skb_clone(chunk->skb, 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 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, 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, 0, 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(&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
757fail_mark:
758 kfree_skb(skb);
759fail:
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 */
771struct 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(sizeof(struct sctp_pdapi_event),
781 MSG_NOTIFICATION, gfp);
782 if (!event)
783 goto fail;
784
785 skb = sctp_event2skb(event);
786 pd = skb_put(skb, 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;
821fail:
822 return NULL;
823}
824
825struct sctp_ulpevent *sctp_ulpevent_make_authkey(
826 const struct sctp_association *asoc, __u16 key_id,
827 __u32 indication, gfp_t gfp)
828{
829 struct sctp_ulpevent *event;
830 struct sctp_authkey_event *ak;
831 struct sk_buff *skb;
832
833 event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
834 MSG_NOTIFICATION, gfp);
835 if (!event)
836 goto fail;
837
838 skb = sctp_event2skb(event);
839 ak = skb_put(skb, 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;
856fail:
857 return NULL;
858}
859
860/*
861 * Socket Extensions for SCTP
862 * 6.3.10. SCTP_SENDER_DRY_EVENT
863 */
864struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
865 const struct sctp_association *asoc, gfp_t gfp)
866{
867 struct sctp_ulpevent *event;
868 struct sctp_sender_dry_event *sdry;
869 struct sk_buff *skb;
870
871 event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
872 MSG_NOTIFICATION, gfp);
873 if (!event)
874 return NULL;
875
876 skb = sctp_event2skb(event);
877 sdry = skb_put(skb, 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
888struct 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(length, MSG_NOTIFICATION, gfp);
899 if (!event)
900 return NULL;
901
902 skb = sctp_event2skb(event);
903 sreset = skb_put(skb, 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
917struct 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(sizeof(struct sctp_assoc_reset_event),
926 MSG_NOTIFICATION, gfp);
927 if (!event)
928 return NULL;
929
930 skb = sctp_event2skb(event);
931 areset = skb_put(skb, 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
944struct 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(sizeof(struct sctp_stream_change_event),
953 MSG_NOTIFICATION, gfp);
954 if (!event)
955 return NULL;
956
957 skb = sctp_event2skb(event);
958 schange = skb_put(skb, 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(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 */
987void 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(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 sizeof(sinfo), &sinfo);
1010}
1011
1012/* RFC6458, Section 5.3.5 SCTP Receive Information Structure
1013 * (SCTP_SNDRCV)
1014 */
1015void 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(event->asoc);
1031 rinfo.rcv_context = event->asoc->default_rcv_context;
1032
1033 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO,
1034 sizeof(rinfo), &rinfo);
1035}
1036
1037/* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure
1038 * (SCTP_NXTINFO)
1039 */
1040static 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(event->asoc);
1054
1055 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO,
1056 sizeof(nxtinfo), &nxtinfo);
1057}
1058
1059void 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(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 */
1078static 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(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(sctp_skb2event(frag), asoc);
1099}
1100
1101/* Do accounting for bytes just read by user and release the references to
1102 * the association.
1103 */
1104static 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(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(sctp_skb2event(frag));
1129 }
1130
1131done:
1132 sctp_assoc_rwnd_increase(event->asoc, len);
1133 sctp_chunk_put(event->chunk);
1134 sctp_ulpevent_release_owner(event);
1135}
1136
1137static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
1138{
1139 struct sk_buff *skb, *frag;
1140
1141 skb = sctp_event2skb(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(sctp_skb2event(frag));
1153 }
1154
1155done:
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 */
1164void 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(sctp_event2skb(event));
1172}
1173
1174/* Purge the skb lists holding ulpevents. */
1175unsigned 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}
1/* SCTP kernel 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 *
12 * This SCTP implementation is free software;
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 *
18 * This SCTP implementation is distributed in the hope that it
19 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20 * ************************
21 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 * See the GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with GNU CC; see the file COPYING. If not, see
26 * <http://www.gnu.org/licenses/>.
27 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
30 * lksctp developers <linux-sctp@vger.kernel.org>
31 *
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>
37 */
38
39#include <linux/slab.h>
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
46static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
47 struct sctp_association *asoc);
48static void sctp_ulpevent_release_data(struct sctp_ulpevent *event);
49static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event);
50
51
52/* Initialize an ULP event from an given skb. */
53static void sctp_ulpevent_init(struct sctp_ulpevent *event,
54 int msg_flags,
55 unsigned int len)
56{
57 memset(event, 0, sizeof(struct sctp_ulpevent));
58 event->msg_flags = msg_flags;
59 event->rmem_len = len;
60}
61
62/* Create a new sctp_ulpevent. */
63static struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags,
64 gfp_t gfp)
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);
74 sctp_ulpevent_init(event, msg_flags, skb->truesize);
75
76 return event;
77
78fail:
79 return NULL;
80}
81
82/* Is this a MSG_NOTIFICATION? */
83int 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 */
91static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event,
92 const struct sctp_association *asoc)
93{
94 struct sk_buff *skb;
95
96 /* Cast away the const, as we are just wanting to
97 * bump the reference count.
98 */
99 sctp_association_hold((struct sctp_association *)asoc);
100 skb = sctp_event2skb(event);
101 event->asoc = (struct sctp_association *)asoc;
102 atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
103 sctp_skb_set_owner_r(skb, asoc->base.sk);
104}
105
106/* A simple destructor to give up the reference to the association. */
107static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event)
108{
109 struct sctp_association *asoc = event->asoc;
110
111 atomic_sub(event->rmem_len, &asoc->rmem_alloc);
112 sctp_association_put(asoc);
113}
114
115/* Create and initialize an SCTP_ASSOC_CHANGE event.
116 *
117 * 5.3.1.1 SCTP_ASSOC_CHANGE
118 *
119 * Communication notifications inform the ULP that an SCTP association
120 * has either begun or ended. The identifier for a new association is
121 * provided by this notification.
122 *
123 * Note: There is no field checking here. If a field is unused it will be
124 * zero'd out.
125 */
126struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
127 const struct sctp_association *asoc,
128 __u16 flags, __u16 state, __u16 error, __u16 outbound,
129 __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp)
130{
131 struct sctp_ulpevent *event;
132 struct sctp_assoc_change *sac;
133 struct sk_buff *skb;
134
135 /* If the lower layer passed in the chunk, it will be
136 * an ABORT, so we need to include it in the sac_info.
137 */
138 if (chunk) {
139 /* Copy the chunk data to a new skb and reserve enough
140 * head room to use as notification.
141 */
142 skb = skb_copy_expand(chunk->skb,
143 sizeof(struct sctp_assoc_change), 0, gfp);
144
145 if (!skb)
146 goto fail;
147
148 /* Embed the event fields inside the cloned skb. */
149 event = sctp_skb2event(skb);
150 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
151
152 /* Include the notification structure */
153 sac = (struct sctp_assoc_change *)
154 skb_push(skb, sizeof(struct sctp_assoc_change));
155
156 /* Trim the buffer to the right length. */
157 skb_trim(skb, sizeof(struct sctp_assoc_change) +
158 ntohs(chunk->chunk_hdr->length) -
159 sizeof(sctp_chunkhdr_t));
160 } else {
161 event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
162 MSG_NOTIFICATION, gfp);
163 if (!event)
164 goto fail;
165
166 skb = sctp_event2skb(event);
167 sac = (struct sctp_assoc_change *) skb_put(skb,
168 sizeof(struct sctp_assoc_change));
169 }
170
171 /* Socket Extensions for SCTP
172 * 5.3.1.1 SCTP_ASSOC_CHANGE
173 *
174 * sac_type:
175 * It should be SCTP_ASSOC_CHANGE.
176 */
177 sac->sac_type = SCTP_ASSOC_CHANGE;
178
179 /* Socket Extensions for SCTP
180 * 5.3.1.1 SCTP_ASSOC_CHANGE
181 *
182 * sac_state: 32 bits (signed integer)
183 * This field holds one of a number of values that communicate the
184 * event that happened to the association.
185 */
186 sac->sac_state = state;
187
188 /* Socket Extensions for SCTP
189 * 5.3.1.1 SCTP_ASSOC_CHANGE
190 *
191 * sac_flags: 16 bits (unsigned integer)
192 * Currently unused.
193 */
194 sac->sac_flags = 0;
195
196 /* Socket Extensions for SCTP
197 * 5.3.1.1 SCTP_ASSOC_CHANGE
198 *
199 * sac_length: sizeof (__u32)
200 * This field is the total length of the notification data, including
201 * the notification header.
202 */
203 sac->sac_length = skb->len;
204
205 /* Socket Extensions for SCTP
206 * 5.3.1.1 SCTP_ASSOC_CHANGE
207 *
208 * sac_error: 32 bits (signed integer)
209 *
210 * If the state was reached due to a error condition (e.g.
211 * COMMUNICATION_LOST) any relevant error information is available in
212 * this field. This corresponds to the protocol error codes defined in
213 * [SCTP].
214 */
215 sac->sac_error = error;
216
217 /* Socket Extensions for SCTP
218 * 5.3.1.1 SCTP_ASSOC_CHANGE
219 *
220 * sac_outbound_streams: 16 bits (unsigned integer)
221 * sac_inbound_streams: 16 bits (unsigned integer)
222 *
223 * The maximum number of streams allowed in each direction are
224 * available in sac_outbound_streams and sac_inbound streams.
225 */
226 sac->sac_outbound_streams = outbound;
227 sac->sac_inbound_streams = inbound;
228
229 /* Socket Extensions for SCTP
230 * 5.3.1.1 SCTP_ASSOC_CHANGE
231 *
232 * sac_assoc_id: sizeof (sctp_assoc_t)
233 *
234 * The association id field, holds the identifier for the association.
235 * All notifications for a given association have the same association
236 * identifier. For TCP style socket, this field is ignored.
237 */
238 sctp_ulpevent_set_owner(event, asoc);
239 sac->sac_assoc_id = sctp_assoc2id(asoc);
240
241 return event;
242
243fail:
244 return NULL;
245}
246
247/* Create and initialize an SCTP_PEER_ADDR_CHANGE event.
248 *
249 * Socket Extensions for SCTP - draft-01
250 * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
251 *
252 * When a destination address on a multi-homed peer encounters a change
253 * an interface details event is sent.
254 */
255struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
256 const struct sctp_association *asoc,
257 const struct sockaddr_storage *aaddr,
258 int flags, int state, int error, gfp_t gfp)
259{
260 struct sctp_ulpevent *event;
261 struct sctp_paddr_change *spc;
262 struct sk_buff *skb;
263
264 event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change),
265 MSG_NOTIFICATION, gfp);
266 if (!event)
267 goto fail;
268
269 skb = sctp_event2skb(event);
270 spc = (struct sctp_paddr_change *)
271 skb_put(skb, sizeof(struct sctp_paddr_change));
272
273 /* Sockets API Extensions for SCTP
274 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
275 *
276 * spc_type:
277 *
278 * It should be SCTP_PEER_ADDR_CHANGE.
279 */
280 spc->spc_type = SCTP_PEER_ADDR_CHANGE;
281
282 /* Sockets API Extensions for SCTP
283 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
284 *
285 * spc_length: sizeof (__u32)
286 *
287 * This field is the total length of the notification data, including
288 * the notification header.
289 */
290 spc->spc_length = sizeof(struct sctp_paddr_change);
291
292 /* Sockets API Extensions for SCTP
293 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
294 *
295 * spc_flags: 16 bits (unsigned integer)
296 * Currently unused.
297 */
298 spc->spc_flags = 0;
299
300 /* Sockets API Extensions for SCTP
301 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
302 *
303 * spc_state: 32 bits (signed integer)
304 *
305 * This field holds one of a number of values that communicate the
306 * event that happened to the address.
307 */
308 spc->spc_state = state;
309
310 /* Sockets API Extensions for SCTP
311 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
312 *
313 * spc_error: 32 bits (signed integer)
314 *
315 * If the state was reached due to any error condition (e.g.
316 * ADDRESS_UNREACHABLE) any relevant error information is available in
317 * this field.
318 */
319 spc->spc_error = error;
320
321 /* Socket Extensions for SCTP
322 * 5.3.1.1 SCTP_ASSOC_CHANGE
323 *
324 * spc_assoc_id: sizeof (sctp_assoc_t)
325 *
326 * The association id field, holds the identifier for the association.
327 * All notifications for a given association have the same association
328 * identifier. For TCP style socket, this field is ignored.
329 */
330 sctp_ulpevent_set_owner(event, asoc);
331 spc->spc_assoc_id = sctp_assoc2id(asoc);
332
333 /* Sockets API Extensions for SCTP
334 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
335 *
336 * spc_aaddr: sizeof (struct sockaddr_storage)
337 *
338 * The affected address field, holds the remote peer's address that is
339 * encountering the change of state.
340 */
341 memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage));
342
343 /* Map ipv4 address into v4-mapped-on-v6 address. */
344 sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_to_user(
345 sctp_sk(asoc->base.sk),
346 (union sctp_addr *)&spc->spc_aaddr);
347
348 return event;
349
350fail:
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 */
369struct sctp_ulpevent *
370sctp_ulpevent_make_remote_error(const struct sctp_association *asoc,
371 struct sctp_chunk *chunk, __u16 flags,
372 gfp_t gfp)
373{
374 struct sctp_ulpevent *event;
375 struct sctp_remote_error *sre;
376 struct sk_buff *skb;
377 sctp_errhdr_t *ch;
378 __be16 cause;
379 int elen;
380
381 ch = (sctp_errhdr_t *)(chunk->skb->data);
382 cause = ch->cause;
383 elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);
384
385 /* Pull off the ERROR header. */
386 skb_pull(chunk->skb, sizeof(sctp_errhdr_t));
387
388 /* Copy the skb to a new skb with room for us to prepend
389 * notification with.
390 */
391 skb = skb_copy_expand(chunk->skb, sizeof(*sre), 0, gfp);
392
393 /* Pull off the rest of the cause TLV from the chunk. */
394 skb_pull(chunk->skb, elen);
395 if (!skb)
396 goto fail;
397
398 /* Embed the event fields inside the cloned skb. */
399 event = sctp_skb2event(skb);
400 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
401
402 sre = (struct sctp_remote_error *) skb_push(skb, sizeof(*sre));
403
404 /* Trim the buffer to the right length. */
405 skb_trim(skb, sizeof(*sre) + elen);
406
407 /* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */
408 memset(sre, 0, sizeof(*sre));
409 sre->sre_type = SCTP_REMOTE_ERROR;
410 sre->sre_flags = 0;
411 sre->sre_length = skb->len;
412 sre->sre_error = cause;
413 sctp_ulpevent_set_owner(event, asoc);
414 sre->sre_assoc_id = sctp_assoc2id(asoc);
415
416 return event;
417fail:
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 */
426struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
427 const struct sctp_association *asoc, struct sctp_chunk *chunk,
428 __u16 flags, __u32 error, gfp_t gfp)
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);
451 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
452
453 ssf = (struct sctp_send_failed *)
454 skb_push(skb, sizeof(struct sctp_send_failed));
455
456 /* Socket Extensions for SCTP
457 * 5.3.1.4 SCTP_SEND_FAILED
458 *
459 * ssf_type:
460 * It should be SCTP_SEND_FAILED.
461 */
462 ssf->ssf_type = SCTP_SEND_FAILED;
463
464 /* Socket Extensions for SCTP
465 * 5.3.1.4 SCTP_SEND_FAILED
466 *
467 * ssf_flags: 16 bits (unsigned integer)
468 * The flag value will take one of the following values
469 *
470 * SCTP_DATA_UNSENT - Indicates that the data was never put on
471 * the wire.
472 *
473 * SCTP_DATA_SENT - Indicates that the data was put on the wire.
474 * Note that this does not necessarily mean that the
475 * data was (or was not) successfully delivered.
476 */
477 ssf->ssf_flags = flags;
478
479 /* Socket Extensions for SCTP
480 * 5.3.1.4 SCTP_SEND_FAILED
481 *
482 * ssf_length: sizeof (__u32)
483 * This field is the total length of the notification data, including
484 * the notification header.
485 */
486 ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
487 skb_trim(skb, ssf->ssf_length);
488
489 /* Socket Extensions for SCTP
490 * 5.3.1.4 SCTP_SEND_FAILED
491 *
492 * ssf_error: 16 bits (unsigned integer)
493 * This value represents the reason why the send failed, and if set,
494 * will be a SCTP protocol error code as defined in [SCTP] section
495 * 3.3.10.
496 */
497 ssf->ssf_error = error;
498
499 /* Socket Extensions for SCTP
500 * 5.3.1.4 SCTP_SEND_FAILED
501 *
502 * ssf_info: sizeof (struct sctp_sndrcvinfo)
503 * The original send information associated with the undelivered
504 * message.
505 */
506 memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));
507
508 /* Per TSVWG discussion with Randy. Allow the application to
509 * reassemble a fragmented message.
510 */
511 ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;
512
513 /* Socket Extensions for SCTP
514 * 5.3.1.4 SCTP_SEND_FAILED
515 *
516 * ssf_assoc_id: sizeof (sctp_assoc_t)
517 * The association id field, sf_assoc_id, holds the identifier for the
518 * association. All notifications for a given association have the
519 * same association identifier. For TCP style socket, this field is
520 * ignored.
521 */
522 sctp_ulpevent_set_owner(event, asoc);
523 ssf->ssf_assoc_id = sctp_assoc2id(asoc);
524 return event;
525
526fail:
527 return NULL;
528}
529
530/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
531 *
532 * Socket Extensions for SCTP - draft-01
533 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
534 */
535struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
536 const struct sctp_association *asoc,
537 __u16 flags, gfp_t gfp)
538{
539 struct sctp_ulpevent *event;
540 struct sctp_shutdown_event *sse;
541 struct sk_buff *skb;
542
543 event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
544 MSG_NOTIFICATION, gfp);
545 if (!event)
546 goto fail;
547
548 skb = sctp_event2skb(event);
549 sse = (struct sctp_shutdown_event *)
550 skb_put(skb, sizeof(struct sctp_shutdown_event));
551
552 /* Socket Extensions for SCTP
553 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
554 *
555 * sse_type
556 * It should be SCTP_SHUTDOWN_EVENT
557 */
558 sse->sse_type = SCTP_SHUTDOWN_EVENT;
559
560 /* Socket Extensions for SCTP
561 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
562 *
563 * sse_flags: 16 bits (unsigned integer)
564 * Currently unused.
565 */
566 sse->sse_flags = 0;
567
568 /* Socket Extensions for SCTP
569 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
570 *
571 * sse_length: sizeof (__u32)
572 * This field is the total length of the notification data, including
573 * the notification header.
574 */
575 sse->sse_length = sizeof(struct sctp_shutdown_event);
576
577 /* Socket Extensions for SCTP
578 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
579 *
580 * sse_assoc_id: sizeof (sctp_assoc_t)
581 * The association id field, holds the identifier for the association.
582 * All notifications for a given association have the same association
583 * identifier. For TCP style socket, this field is ignored.
584 */
585 sctp_ulpevent_set_owner(event, asoc);
586 sse->sse_assoc_id = sctp_assoc2id(asoc);
587
588 return event;
589
590fail:
591 return NULL;
592}
593
594/* Create and initialize a SCTP_ADAPTATION_INDICATION notification.
595 *
596 * Socket Extensions for SCTP
597 * 5.3.1.6 SCTP_ADAPTATION_INDICATION
598 */
599struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
600 const struct sctp_association *asoc, gfp_t gfp)
601{
602 struct sctp_ulpevent *event;
603 struct sctp_adaptation_event *sai;
604 struct sk_buff *skb;
605
606 event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event),
607 MSG_NOTIFICATION, gfp);
608 if (!event)
609 goto fail;
610
611 skb = sctp_event2skb(event);
612 sai = (struct sctp_adaptation_event *)
613 skb_put(skb, sizeof(struct sctp_adaptation_event));
614
615 sai->sai_type = SCTP_ADAPTATION_INDICATION;
616 sai->sai_flags = 0;
617 sai->sai_length = sizeof(struct sctp_adaptation_event);
618 sai->sai_adaptation_ind = asoc->peer.adaptation_ind;
619 sctp_ulpevent_set_owner(event, asoc);
620 sai->sai_assoc_id = sctp_assoc2id(asoc);
621
622 return event;
623
624fail:
625 return NULL;
626}
627
628/* A message has been received. Package this message as a notification
629 * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo
630 * even if filtered out later.
631 *
632 * Socket Extensions for SCTP
633 * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
634 */
635struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
636 struct sctp_chunk *chunk,
637 gfp_t gfp)
638{
639 struct sctp_ulpevent *event = NULL;
640 struct sk_buff *skb;
641 size_t padding, len;
642 int rx_count;
643
644 /*
645 * check to see if we need to make space for this
646 * new skb, expand the rcvbuffer if needed, or drop
647 * the frame
648 */
649 if (asoc->ep->rcvbuf_policy)
650 rx_count = atomic_read(&asoc->rmem_alloc);
651 else
652 rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc);
653
654 if (rx_count >= asoc->base.sk->sk_rcvbuf) {
655
656 if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
657 (!sk_rmem_schedule(asoc->base.sk, chunk->skb,
658 chunk->skb->truesize)))
659 goto fail;
660 }
661
662 /* Clone the original skb, sharing the data. */
663 skb = skb_clone(chunk->skb, gfp);
664 if (!skb)
665 goto fail;
666
667 /* Now that all memory allocations for this chunk succeeded, we
668 * can mark it as received so the tsn_map is updated correctly.
669 */
670 if (sctp_tsnmap_mark(&asoc->peer.tsn_map,
671 ntohl(chunk->subh.data_hdr->tsn),
672 chunk->transport))
673 goto fail_mark;
674
675 /* First calculate the padding, so we don't inadvertently
676 * pass up the wrong length to the user.
677 *
678 * RFC 2960 - Section 3.2 Chunk Field Descriptions
679 *
680 * The total length of a chunk(including Type, Length and Value fields)
681 * MUST be a multiple of 4 bytes. If the length of the chunk is not a
682 * multiple of 4 bytes, the sender MUST pad the chunk with all zero
683 * bytes and this padding is not included in the chunk length field.
684 * The sender should never pad with more than 3 bytes. The receiver
685 * MUST ignore the padding bytes.
686 */
687 len = ntohs(chunk->chunk_hdr->length);
688 padding = WORD_ROUND(len) - len;
689
690 /* Fixup cloned skb with just this chunks data. */
691 skb_trim(skb, chunk->chunk_end - padding - skb->data);
692
693 /* Embed the event fields inside the cloned skb. */
694 event = sctp_skb2event(skb);
695
696 /* Initialize event with flags 0 and correct length
697 * Since this is a clone of the original skb, only account for
698 * the data of this chunk as other chunks will be accounted separately.
699 */
700 sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
701
702 sctp_ulpevent_receive_data(event, asoc);
703
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) {
708 event->flags |= SCTP_UNORDERED;
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;
713 event->iif = sctp_chunk_iif(chunk);
714
715 return event;
716
717fail_mark:
718 kfree_skb(skb);
719fail:
720 return NULL;
721}
722
723/* Create a partial delivery related event.
724 *
725 * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
726 *
727 * When a receiver is engaged in a partial delivery of a
728 * message this notification will be used to indicate
729 * various events.
730 */
731struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
732 const struct sctp_association *asoc, __u32 indication,
733 gfp_t gfp)
734{
735 struct sctp_ulpevent *event;
736 struct sctp_pdapi_event *pd;
737 struct sk_buff *skb;
738
739 event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
740 MSG_NOTIFICATION, gfp);
741 if (!event)
742 goto fail;
743
744 skb = sctp_event2skb(event);
745 pd = (struct sctp_pdapi_event *)
746 skb_put(skb, sizeof(struct sctp_pdapi_event));
747
748 /* pdapi_type
749 * It should be SCTP_PARTIAL_DELIVERY_EVENT
750 *
751 * pdapi_flags: 16 bits (unsigned integer)
752 * Currently unused.
753 */
754 pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
755 pd->pdapi_flags = 0;
756
757 /* pdapi_length: 32 bits (unsigned integer)
758 *
759 * This field is the total length of the notification data, including
760 * the notification header. It will generally be sizeof (struct
761 * sctp_pdapi_event).
762 */
763 pd->pdapi_length = sizeof(struct sctp_pdapi_event);
764
765 /* pdapi_indication: 32 bits (unsigned integer)
766 *
767 * This field holds the indication being sent to the application.
768 */
769 pd->pdapi_indication = indication;
770
771 /* pdapi_assoc_id: sizeof (sctp_assoc_t)
772 *
773 * The association id field, holds the identifier for the association.
774 */
775 sctp_ulpevent_set_owner(event, asoc);
776 pd->pdapi_assoc_id = sctp_assoc2id(asoc);
777
778 return event;
779fail:
780 return NULL;
781}
782
783struct sctp_ulpevent *sctp_ulpevent_make_authkey(
784 const struct sctp_association *asoc, __u16 key_id,
785 __u32 indication, gfp_t gfp)
786{
787 struct sctp_ulpevent *event;
788 struct sctp_authkey_event *ak;
789 struct sk_buff *skb;
790
791 event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
792 MSG_NOTIFICATION, gfp);
793 if (!event)
794 goto fail;
795
796 skb = sctp_event2skb(event);
797 ak = (struct sctp_authkey_event *)
798 skb_put(skb, sizeof(struct sctp_authkey_event));
799
800 ak->auth_type = SCTP_AUTHENTICATION_EVENT;
801 ak->auth_flags = 0;
802 ak->auth_length = sizeof(struct sctp_authkey_event);
803
804 ak->auth_keynumber = key_id;
805 ak->auth_altkeynumber = 0;
806 ak->auth_indication = indication;
807
808 /*
809 * The association id field, holds the identifier for the association.
810 */
811 sctp_ulpevent_set_owner(event, asoc);
812 ak->auth_assoc_id = sctp_assoc2id(asoc);
813
814 return event;
815fail:
816 return NULL;
817}
818
819/*
820 * Socket Extensions for SCTP
821 * 6.3.10. SCTP_SENDER_DRY_EVENT
822 */
823struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
824 const struct sctp_association *asoc, gfp_t gfp)
825{
826 struct sctp_ulpevent *event;
827 struct sctp_sender_dry_event *sdry;
828 struct sk_buff *skb;
829
830 event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
831 MSG_NOTIFICATION, gfp);
832 if (!event)
833 return NULL;
834
835 skb = sctp_event2skb(event);
836 sdry = (struct sctp_sender_dry_event *)
837 skb_put(skb, sizeof(struct sctp_sender_dry_event));
838
839 sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
840 sdry->sender_dry_flags = 0;
841 sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
842 sctp_ulpevent_set_owner(event, asoc);
843 sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
844
845 return event;
846}
847
848/* Return the notification type, assuming this is a notification
849 * event.
850 */
851__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
852{
853 union sctp_notification *notification;
854 struct sk_buff *skb;
855
856 skb = sctp_event2skb(event);
857 notification = (union sctp_notification *) skb->data;
858 return notification->sn_header.sn_type;
859}
860
861/* RFC6458, Section 5.3.2. SCTP Header Information Structure
862 * (SCTP_SNDRCV, DEPRECATED)
863 */
864void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
865 struct msghdr *msghdr)
866{
867 struct sctp_sndrcvinfo sinfo;
868
869 if (sctp_ulpevent_is_notification(event))
870 return;
871
872 memset(&sinfo, 0, sizeof(sinfo));
873 sinfo.sinfo_stream = event->stream;
874 sinfo.sinfo_ssn = event->ssn;
875 sinfo.sinfo_ppid = event->ppid;
876 sinfo.sinfo_flags = event->flags;
877 sinfo.sinfo_tsn = event->tsn;
878 sinfo.sinfo_cumtsn = event->cumtsn;
879 sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
880 /* Context value that is set via SCTP_CONTEXT socket option. */
881 sinfo.sinfo_context = event->asoc->default_rcv_context;
882 /* These fields are not used while receiving. */
883 sinfo.sinfo_timetolive = 0;
884
885 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
886 sizeof(sinfo), &sinfo);
887}
888
889/* RFC6458, Section 5.3.5 SCTP Receive Information Structure
890 * (SCTP_SNDRCV)
891 */
892void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
893 struct msghdr *msghdr)
894{
895 struct sctp_rcvinfo rinfo;
896
897 if (sctp_ulpevent_is_notification(event))
898 return;
899
900 memset(&rinfo, 0, sizeof(struct sctp_rcvinfo));
901 rinfo.rcv_sid = event->stream;
902 rinfo.rcv_ssn = event->ssn;
903 rinfo.rcv_ppid = event->ppid;
904 rinfo.rcv_flags = event->flags;
905 rinfo.rcv_tsn = event->tsn;
906 rinfo.rcv_cumtsn = event->cumtsn;
907 rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc);
908 rinfo.rcv_context = event->asoc->default_rcv_context;
909
910 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO,
911 sizeof(rinfo), &rinfo);
912}
913
914/* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure
915 * (SCTP_NXTINFO)
916 */
917static void __sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
918 struct msghdr *msghdr,
919 const struct sk_buff *skb)
920{
921 struct sctp_nxtinfo nxtinfo;
922
923 memset(&nxtinfo, 0, sizeof(nxtinfo));
924 nxtinfo.nxt_sid = event->stream;
925 nxtinfo.nxt_ppid = event->ppid;
926 nxtinfo.nxt_flags = event->flags;
927 if (sctp_ulpevent_is_notification(event))
928 nxtinfo.nxt_flags |= SCTP_NOTIFICATION;
929 nxtinfo.nxt_length = skb->len;
930 nxtinfo.nxt_assoc_id = sctp_assoc2id(event->asoc);
931
932 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO,
933 sizeof(nxtinfo), &nxtinfo);
934}
935
936void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
937 struct msghdr *msghdr,
938 struct sock *sk)
939{
940 struct sk_buff *skb;
941 int err;
942
943 skb = sctp_skb_recv_datagram(sk, MSG_PEEK, 1, &err);
944 if (skb != NULL) {
945 __sctp_ulpevent_read_nxtinfo(sctp_skb2event(skb),
946 msghdr, skb);
947 /* Just release refcount here. */
948 kfree_skb(skb);
949 }
950}
951
952/* Do accounting for bytes received and hold a reference to the association
953 * for each skb.
954 */
955static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
956 struct sctp_association *asoc)
957{
958 struct sk_buff *skb, *frag;
959
960 skb = sctp_event2skb(event);
961 /* Set the owner and charge rwnd for bytes received. */
962 sctp_ulpevent_set_owner(event, asoc);
963 sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));
964
965 if (!skb->data_len)
966 return;
967
968 /* Note: Not clearing the entire event struct as this is just a
969 * fragment of the real event. However, we still need to do rwnd
970 * accounting.
971 * In general, the skb passed from IP can have only 1 level of
972 * fragments. But we allow multiple levels of fragments.
973 */
974 skb_walk_frags(skb, frag)
975 sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
976}
977
978/* Do accounting for bytes just read by user and release the references to
979 * the association.
980 */
981static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
982{
983 struct sk_buff *skb, *frag;
984 unsigned int len;
985
986 /* Current stack structures assume that the rcv buffer is
987 * per socket. For UDP style sockets this is not true as
988 * multiple associations may be on a single UDP-style socket.
989 * Use the local private area of the skb to track the owning
990 * association.
991 */
992
993 skb = sctp_event2skb(event);
994 len = skb->len;
995
996 if (!skb->data_len)
997 goto done;
998
999 /* Don't forget the fragments. */
1000 skb_walk_frags(skb, frag) {
1001 /* NOTE: skb_shinfos are recursive. Although IP returns
1002 * skb's with only 1 level of fragments, SCTP reassembly can
1003 * increase the levels.
1004 */
1005 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1006 }
1007
1008done:
1009 sctp_assoc_rwnd_increase(event->asoc, len);
1010 sctp_ulpevent_release_owner(event);
1011}
1012
1013static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
1014{
1015 struct sk_buff *skb, *frag;
1016
1017 skb = sctp_event2skb(event);
1018
1019 if (!skb->data_len)
1020 goto done;
1021
1022 /* Don't forget the fragments. */
1023 skb_walk_frags(skb, frag) {
1024 /* NOTE: skb_shinfos are recursive. Although IP returns
1025 * skb's with only 1 level of fragments, SCTP reassembly can
1026 * increase the levels.
1027 */
1028 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1029 }
1030
1031done:
1032 sctp_ulpevent_release_owner(event);
1033}
1034
1035/* Free a ulpevent that has an owner. It includes releasing the reference
1036 * to the owner, updating the rwnd in case of a DATA event and freeing the
1037 * skb.
1038 */
1039void sctp_ulpevent_free(struct sctp_ulpevent *event)
1040{
1041 if (sctp_ulpevent_is_notification(event))
1042 sctp_ulpevent_release_owner(event);
1043 else
1044 sctp_ulpevent_release_data(event);
1045
1046 kfree_skb(sctp_event2skb(event));
1047}
1048
1049/* Purge the skb lists holding ulpevents. */
1050unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list)
1051{
1052 struct sk_buff *skb;
1053 unsigned int data_unread = 0;
1054
1055 while ((skb = skb_dequeue(list)) != NULL) {
1056 struct sctp_ulpevent *event = sctp_skb2event(skb);
1057
1058 if (!sctp_ulpevent_is_notification(event))
1059 data_unread += skb->len;
1060
1061 sctp_ulpevent_free(event);
1062 }
1063
1064 return data_unread;
1065}