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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_v4map(
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 *sctp_ulpevent_make_remote_error(
370 const struct sctp_association *asoc, struct sctp_chunk *chunk,
371 __u16 flags, gfp_t gfp)
372{
373 struct sctp_ulpevent *event;
374 struct sctp_remote_error *sre;
375 struct sk_buff *skb;
376 sctp_errhdr_t *ch;
377 __be16 cause;
378 int elen;
379
380 ch = (sctp_errhdr_t *)(chunk->skb->data);
381 cause = ch->cause;
382 elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);
383
384 /* Pull off the ERROR header. */
385 skb_pull(chunk->skb, sizeof(sctp_errhdr_t));
386
387 /* Copy the skb to a new skb with room for us to prepend
388 * notification with.
389 */
390 skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error),
391 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 *)
403 skb_push(skb, sizeof(struct sctp_remote_error));
404
405 /* Trim the buffer to the right length. */
406 skb_trim(skb, sizeof(struct sctp_remote_error) + elen);
407
408 /* Socket Extensions for SCTP
409 * 5.3.1.3 SCTP_REMOTE_ERROR
410 *
411 * sre_type:
412 * It should be SCTP_REMOTE_ERROR.
413 */
414 sre->sre_type = SCTP_REMOTE_ERROR;
415
416 /*
417 * Socket Extensions for SCTP
418 * 5.3.1.3 SCTP_REMOTE_ERROR
419 *
420 * sre_flags: 16 bits (unsigned integer)
421 * Currently unused.
422 */
423 sre->sre_flags = 0;
424
425 /* Socket Extensions for SCTP
426 * 5.3.1.3 SCTP_REMOTE_ERROR
427 *
428 * sre_length: sizeof (__u32)
429 *
430 * This field is the total length of the notification data,
431 * including the notification header.
432 */
433 sre->sre_length = skb->len;
434
435 /* Socket Extensions for SCTP
436 * 5.3.1.3 SCTP_REMOTE_ERROR
437 *
438 * sre_error: 16 bits (unsigned integer)
439 * This value represents one of the Operational Error causes defined in
440 * the SCTP specification, in network byte order.
441 */
442 sre->sre_error = cause;
443
444 /* Socket Extensions for SCTP
445 * 5.3.1.3 SCTP_REMOTE_ERROR
446 *
447 * sre_assoc_id: sizeof (sctp_assoc_t)
448 *
449 * The association id field, holds the identifier for the association.
450 * All notifications for a given association have the same association
451 * identifier. For TCP style socket, this field is ignored.
452 */
453 sctp_ulpevent_set_owner(event, asoc);
454 sre->sre_assoc_id = sctp_assoc2id(asoc);
455
456 return event;
457
458fail:
459 return NULL;
460}
461
462/* Create and initialize a SCTP_SEND_FAILED notification.
463 *
464 * Socket Extensions for SCTP - draft-01
465 * 5.3.1.4 SCTP_SEND_FAILED
466 */
467struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
468 const struct sctp_association *asoc, struct sctp_chunk *chunk,
469 __u16 flags, __u32 error, gfp_t gfp)
470{
471 struct sctp_ulpevent *event;
472 struct sctp_send_failed *ssf;
473 struct sk_buff *skb;
474
475 /* Pull off any padding. */
476 int len = ntohs(chunk->chunk_hdr->length);
477
478 /* Make skb with more room so we can prepend notification. */
479 skb = skb_copy_expand(chunk->skb,
480 sizeof(struct sctp_send_failed), /* headroom */
481 0, /* tailroom */
482 gfp);
483 if (!skb)
484 goto fail;
485
486 /* Pull off the common chunk header and DATA header. */
487 skb_pull(skb, sizeof(struct sctp_data_chunk));
488 len -= sizeof(struct sctp_data_chunk);
489
490 /* Embed the event fields inside the cloned skb. */
491 event = sctp_skb2event(skb);
492 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
493
494 ssf = (struct sctp_send_failed *)
495 skb_push(skb, sizeof(struct sctp_send_failed));
496
497 /* Socket Extensions for SCTP
498 * 5.3.1.4 SCTP_SEND_FAILED
499 *
500 * ssf_type:
501 * It should be SCTP_SEND_FAILED.
502 */
503 ssf->ssf_type = SCTP_SEND_FAILED;
504
505 /* Socket Extensions for SCTP
506 * 5.3.1.4 SCTP_SEND_FAILED
507 *
508 * ssf_flags: 16 bits (unsigned integer)
509 * The flag value will take one of the following values
510 *
511 * SCTP_DATA_UNSENT - Indicates that the data was never put on
512 * the wire.
513 *
514 * SCTP_DATA_SENT - Indicates that the data was put on the wire.
515 * Note that this does not necessarily mean that the
516 * data was (or was not) successfully delivered.
517 */
518 ssf->ssf_flags = flags;
519
520 /* Socket Extensions for SCTP
521 * 5.3.1.4 SCTP_SEND_FAILED
522 *
523 * ssf_length: sizeof (__u32)
524 * This field is the total length of the notification data, including
525 * the notification header.
526 */
527 ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
528 skb_trim(skb, ssf->ssf_length);
529
530 /* Socket Extensions for SCTP
531 * 5.3.1.4 SCTP_SEND_FAILED
532 *
533 * ssf_error: 16 bits (unsigned integer)
534 * This value represents the reason why the send failed, and if set,
535 * will be a SCTP protocol error code as defined in [SCTP] section
536 * 3.3.10.
537 */
538 ssf->ssf_error = error;
539
540 /* Socket Extensions for SCTP
541 * 5.3.1.4 SCTP_SEND_FAILED
542 *
543 * ssf_info: sizeof (struct sctp_sndrcvinfo)
544 * The original send information associated with the undelivered
545 * message.
546 */
547 memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));
548
549 /* Per TSVWG discussion with Randy. Allow the application to
550 * reassemble a fragmented message.
551 */
552 ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;
553
554 /* Socket Extensions for SCTP
555 * 5.3.1.4 SCTP_SEND_FAILED
556 *
557 * ssf_assoc_id: sizeof (sctp_assoc_t)
558 * The association id field, sf_assoc_id, holds the identifier for the
559 * association. All notifications for a given association have the
560 * same association identifier. For TCP style socket, this field is
561 * ignored.
562 */
563 sctp_ulpevent_set_owner(event, asoc);
564 ssf->ssf_assoc_id = sctp_assoc2id(asoc);
565 return event;
566
567fail:
568 return NULL;
569}
570
571/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
572 *
573 * Socket Extensions for SCTP - draft-01
574 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
575 */
576struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
577 const struct sctp_association *asoc,
578 __u16 flags, gfp_t gfp)
579{
580 struct sctp_ulpevent *event;
581 struct sctp_shutdown_event *sse;
582 struct sk_buff *skb;
583
584 event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
585 MSG_NOTIFICATION, gfp);
586 if (!event)
587 goto fail;
588
589 skb = sctp_event2skb(event);
590 sse = (struct sctp_shutdown_event *)
591 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 = (struct sctp_adaptation_event *)
654 skb_put(skb, sizeof(struct sctp_adaptation_event));
655
656 sai->sai_type = SCTP_ADAPTATION_INDICATION;
657 sai->sai_flags = 0;
658 sai->sai_length = sizeof(struct sctp_adaptation_event);
659 sai->sai_adaptation_ind = asoc->peer.adaptation_ind;
660 sctp_ulpevent_set_owner(event, asoc);
661 sai->sai_assoc_id = sctp_assoc2id(asoc);
662
663 return event;
664
665fail:
666 return NULL;
667}
668
669/* A message has been received. Package this message as a notification
670 * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo
671 * even if filtered out later.
672 *
673 * Socket Extensions for SCTP
674 * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
675 */
676struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
677 struct sctp_chunk *chunk,
678 gfp_t gfp)
679{
680 struct sctp_ulpevent *event = NULL;
681 struct sk_buff *skb;
682 size_t padding, len;
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(&asoc->base.sk->sk_rmem_alloc);
694
695 if (rx_count >= asoc->base.sk->sk_rcvbuf) {
696
697 if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
698 (!sk_rmem_schedule(asoc->base.sk, chunk->skb,
699 chunk->skb->truesize)))
700 goto fail;
701 }
702
703 /* Clone the original skb, sharing the data. */
704 skb = skb_clone(chunk->skb, gfp);
705 if (!skb)
706 goto fail;
707
708 /* Now that all memory allocations for this chunk succeeded, we
709 * can mark it as received so the tsn_map is updated correctly.
710 */
711 if (sctp_tsnmap_mark(&asoc->peer.tsn_map,
712 ntohl(chunk->subh.data_hdr->tsn),
713 chunk->transport))
714 goto fail_mark;
715
716 /* First calculate the padding, so we don't inadvertently
717 * pass up the wrong length to the user.
718 *
719 * RFC 2960 - Section 3.2 Chunk Field Descriptions
720 *
721 * The total length of a chunk(including Type, Length and Value fields)
722 * MUST be a multiple of 4 bytes. If the length of the chunk is not a
723 * multiple of 4 bytes, the sender MUST pad the chunk with all zero
724 * bytes and this padding is not included in the chunk length field.
725 * The sender should never pad with more than 3 bytes. The receiver
726 * MUST ignore the padding bytes.
727 */
728 len = ntohs(chunk->chunk_hdr->length);
729 padding = WORD_ROUND(len) - len;
730
731 /* Fixup cloned skb with just this chunks data. */
732 skb_trim(skb, chunk->chunk_end - padding - skb->data);
733
734 /* Embed the event fields inside the cloned skb. */
735 event = sctp_skb2event(skb);
736
737 /* Initialize event with flags 0 and correct length
738 * Since this is a clone of the original skb, only account for
739 * the data of this chunk as other chunks will be accounted separately.
740 */
741 sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
742
743 sctp_ulpevent_receive_data(event, asoc);
744
745 event->stream = ntohs(chunk->subh.data_hdr->stream);
746 event->ssn = ntohs(chunk->subh.data_hdr->ssn);
747 event->ppid = chunk->subh.data_hdr->ppid;
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 event->iif = sctp_chunk_iif(chunk);
755
756 return event;
757
758fail_mark:
759 kfree_skb(skb);
760fail:
761 return NULL;
762}
763
764/* Create a partial delivery related event.
765 *
766 * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
767 *
768 * When a receiver is engaged in a partial delivery of a
769 * message this notification will be used to indicate
770 * various events.
771 */
772struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
773 const struct sctp_association *asoc, __u32 indication,
774 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 = (struct sctp_pdapi_event *)
787 skb_put(skb, sizeof(struct sctp_pdapi_event));
788
789 /* pdapi_type
790 * It should be SCTP_PARTIAL_DELIVERY_EVENT
791 *
792 * pdapi_flags: 16 bits (unsigned integer)
793 * Currently unused.
794 */
795 pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
796 pd->pdapi_flags = 0;
797
798 /* pdapi_length: 32 bits (unsigned integer)
799 *
800 * This field is the total length of the notification data, including
801 * the notification header. It will generally be sizeof (struct
802 * sctp_pdapi_event).
803 */
804 pd->pdapi_length = sizeof(struct sctp_pdapi_event);
805
806 /* pdapi_indication: 32 bits (unsigned integer)
807 *
808 * This field holds the indication being sent to the application.
809 */
810 pd->pdapi_indication = indication;
811
812 /* pdapi_assoc_id: sizeof (sctp_assoc_t)
813 *
814 * The association id field, holds the identifier for the association.
815 */
816 sctp_ulpevent_set_owner(event, asoc);
817 pd->pdapi_assoc_id = sctp_assoc2id(asoc);
818
819 return event;
820fail:
821 return NULL;
822}
823
824struct sctp_ulpevent *sctp_ulpevent_make_authkey(
825 const struct sctp_association *asoc, __u16 key_id,
826 __u32 indication, gfp_t gfp)
827{
828 struct sctp_ulpevent *event;
829 struct sctp_authkey_event *ak;
830 struct sk_buff *skb;
831
832 event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
833 MSG_NOTIFICATION, gfp);
834 if (!event)
835 goto fail;
836
837 skb = sctp_event2skb(event);
838 ak = (struct sctp_authkey_event *)
839 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 = (struct sctp_sender_dry_event *)
878 skb_put(skb, sizeof(struct sctp_sender_dry_event));
879
880 sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
881 sdry->sender_dry_flags = 0;
882 sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
883 sctp_ulpevent_set_owner(event, asoc);
884 sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
885
886 return event;
887}
888
889/* Return the notification type, assuming this is a notification
890 * event.
891 */
892__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
893{
894 union sctp_notification *notification;
895 struct sk_buff *skb;
896
897 skb = sctp_event2skb(event);
898 notification = (union sctp_notification *) skb->data;
899 return notification->sn_header.sn_type;
900}
901
902/* Copy out the sndrcvinfo into a msghdr. */
903void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
904 struct msghdr *msghdr)
905{
906 struct sctp_sndrcvinfo sinfo;
907
908 if (sctp_ulpevent_is_notification(event))
909 return;
910
911 /* Sockets API Extensions for SCTP
912 * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
913 *
914 * sinfo_stream: 16 bits (unsigned integer)
915 *
916 * For recvmsg() the SCTP stack places the message's stream number in
917 * this value.
918 */
919 sinfo.sinfo_stream = event->stream;
920 /* sinfo_ssn: 16 bits (unsigned integer)
921 *
922 * For recvmsg() this value contains the stream sequence number that
923 * the remote endpoint placed in the DATA chunk. For fragmented
924 * messages this is the same number for all deliveries of the message
925 * (if more than one recvmsg() is needed to read the message).
926 */
927 sinfo.sinfo_ssn = event->ssn;
928 /* sinfo_ppid: 32 bits (unsigned integer)
929 *
930 * In recvmsg() this value is
931 * the same information that was passed by the upper layer in the peer
932 * application. Please note that byte order issues are NOT accounted
933 * for and this information is passed opaquely by the SCTP stack from
934 * one end to the other.
935 */
936 sinfo.sinfo_ppid = event->ppid;
937 /* sinfo_flags: 16 bits (unsigned integer)
938 *
939 * This field may contain any of the following flags and is composed of
940 * a bitwise OR of these values.
941 *
942 * recvmsg() flags:
943 *
944 * SCTP_UNORDERED - This flag is present when the message was sent
945 * non-ordered.
946 */
947 sinfo.sinfo_flags = event->flags;
948 /* sinfo_tsn: 32 bit (unsigned integer)
949 *
950 * For the receiving side, this field holds a TSN that was
951 * assigned to one of the SCTP Data Chunks.
952 */
953 sinfo.sinfo_tsn = event->tsn;
954 /* sinfo_cumtsn: 32 bit (unsigned integer)
955 *
956 * This field will hold the current cumulative TSN as
957 * known by the underlying SCTP layer. Note this field is
958 * ignored when sending and only valid for a receive
959 * operation when sinfo_flags are set to SCTP_UNORDERED.
960 */
961 sinfo.sinfo_cumtsn = event->cumtsn;
962 /* sinfo_assoc_id: sizeof (sctp_assoc_t)
963 *
964 * The association handle field, sinfo_assoc_id, holds the identifier
965 * for the association announced in the COMMUNICATION_UP notification.
966 * All notifications for a given association have the same identifier.
967 * Ignored for one-to-one style sockets.
968 */
969 sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
970
971 /* context value that is set via SCTP_CONTEXT socket option. */
972 sinfo.sinfo_context = event->asoc->default_rcv_context;
973
974 /* These fields are not used while receiving. */
975 sinfo.sinfo_timetolive = 0;
976
977 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
978 sizeof(struct sctp_sndrcvinfo), (void *)&sinfo);
979}
980
981/* Do accounting for bytes received and hold a reference to the association
982 * for each skb.
983 */
984static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
985 struct sctp_association *asoc)
986{
987 struct sk_buff *skb, *frag;
988
989 skb = sctp_event2skb(event);
990 /* Set the owner and charge rwnd for bytes received. */
991 sctp_ulpevent_set_owner(event, asoc);
992 sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));
993
994 if (!skb->data_len)
995 return;
996
997 /* Note: Not clearing the entire event struct as this is just a
998 * fragment of the real event. However, we still need to do rwnd
999 * accounting.
1000 * In general, the skb passed from IP can have only 1 level of
1001 * fragments. But we allow multiple levels of fragments.
1002 */
1003 skb_walk_frags(skb, frag)
1004 sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
1005}
1006
1007/* Do accounting for bytes just read by user and release the references to
1008 * the association.
1009 */
1010static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
1011{
1012 struct sk_buff *skb, *frag;
1013 unsigned int len;
1014
1015 /* Current stack structures assume that the rcv buffer is
1016 * per socket. For UDP style sockets this is not true as
1017 * multiple associations may be on a single UDP-style socket.
1018 * Use the local private area of the skb to track the owning
1019 * association.
1020 */
1021
1022 skb = sctp_event2skb(event);
1023 len = skb->len;
1024
1025 if (!skb->data_len)
1026 goto done;
1027
1028 /* Don't forget the fragments. */
1029 skb_walk_frags(skb, frag) {
1030 /* NOTE: skb_shinfos are recursive. Although IP returns
1031 * skb's with only 1 level of fragments, SCTP reassembly can
1032 * increase the levels.
1033 */
1034 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1035 }
1036
1037done:
1038 sctp_assoc_rwnd_increase(event->asoc, len);
1039 sctp_ulpevent_release_owner(event);
1040}
1041
1042static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
1043{
1044 struct sk_buff *skb, *frag;
1045
1046 skb = sctp_event2skb(event);
1047
1048 if (!skb->data_len)
1049 goto done;
1050
1051 /* Don't forget the fragments. */
1052 skb_walk_frags(skb, frag) {
1053 /* NOTE: skb_shinfos are recursive. Although IP returns
1054 * skb's with only 1 level of fragments, SCTP reassembly can
1055 * increase the levels.
1056 */
1057 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1058 }
1059
1060done:
1061 sctp_ulpevent_release_owner(event);
1062}
1063
1064/* Free a ulpevent that has an owner. It includes releasing the reference
1065 * to the owner, updating the rwnd in case of a DATA event and freeing the
1066 * skb.
1067 */
1068void sctp_ulpevent_free(struct sctp_ulpevent *event)
1069{
1070 if (sctp_ulpevent_is_notification(event))
1071 sctp_ulpevent_release_owner(event);
1072 else
1073 sctp_ulpevent_release_data(event);
1074
1075 kfree_skb(sctp_event2skb(event));
1076}
1077
1078/* Purge the skb lists holding ulpevents. */
1079unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list)
1080{
1081 struct sk_buff *skb;
1082 unsigned int data_unread = 0;
1083
1084 while ((skb = skb_dequeue(list)) != NULL) {
1085 struct sctp_ulpevent *event = sctp_skb2event(skb);
1086
1087 if (!sctp_ulpevent_is_notification(event))
1088 data_unread += skb->len;
1089
1090 sctp_ulpevent_free(event);
1091 }
1092
1093 return data_unread;
1094}
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, write to
26 * the Free Software Foundation, 59 Temple Place - Suite 330,
27 * Boston, MA 02111-1307, USA.
28 *
29 * Please send any bug reports or fixes you make to the
30 * email address(es):
31 * lksctp developers <lksctp-developers@lists.sourceforge.net>
32 *
33 * Or submit a bug report through the following website:
34 * http://www.sf.net/projects/lksctp
35 *
36 * Written or modified by:
37 * Jon Grimm <jgrimm@us.ibm.com>
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Ardelle Fan <ardelle.fan@intel.com>
40 * Sridhar Samudrala <sri@us.ibm.com>
41 *
42 * Any bugs reported given to us we will try to fix... any fixes shared will
43 * be incorporated into the next SCTP release.
44 */
45
46#include <linux/slab.h>
47#include <linux/types.h>
48#include <linux/skbuff.h>
49#include <net/sctp/structs.h>
50#include <net/sctp/sctp.h>
51#include <net/sctp/sm.h>
52
53static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
54 struct sctp_association *asoc);
55static void sctp_ulpevent_release_data(struct sctp_ulpevent *event);
56static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event);
57
58
59/* Initialize an ULP event from an given skb. */
60SCTP_STATIC void sctp_ulpevent_init(struct sctp_ulpevent *event,
61 int msg_flags,
62 unsigned int len)
63{
64 memset(event, 0, sizeof(struct sctp_ulpevent));
65 event->msg_flags = msg_flags;
66 event->rmem_len = len;
67}
68
69/* Create a new sctp_ulpevent. */
70SCTP_STATIC struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags,
71 gfp_t gfp)
72{
73 struct sctp_ulpevent *event;
74 struct sk_buff *skb;
75
76 skb = alloc_skb(size, gfp);
77 if (!skb)
78 goto fail;
79
80 event = sctp_skb2event(skb);
81 sctp_ulpevent_init(event, msg_flags, skb->truesize);
82
83 return event;
84
85fail:
86 return NULL;
87}
88
89/* Is this a MSG_NOTIFICATION? */
90int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event)
91{
92 return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION);
93}
94
95/* Hold the association in case the msg_name needs read out of
96 * the association.
97 */
98static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event,
99 const struct sctp_association *asoc)
100{
101 struct sk_buff *skb;
102
103 /* Cast away the const, as we are just wanting to
104 * bump the reference count.
105 */
106 sctp_association_hold((struct sctp_association *)asoc);
107 skb = sctp_event2skb(event);
108 event->asoc = (struct sctp_association *)asoc;
109 atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
110 sctp_skb_set_owner_r(skb, asoc->base.sk);
111}
112
113/* A simple destructor to give up the reference to the association. */
114static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event)
115{
116 struct sctp_association *asoc = event->asoc;
117
118 atomic_sub(event->rmem_len, &asoc->rmem_alloc);
119 sctp_association_put(asoc);
120}
121
122/* Create and initialize an SCTP_ASSOC_CHANGE event.
123 *
124 * 5.3.1.1 SCTP_ASSOC_CHANGE
125 *
126 * Communication notifications inform the ULP that an SCTP association
127 * has either begun or ended. The identifier for a new association is
128 * provided by this notification.
129 *
130 * Note: There is no field checking here. If a field is unused it will be
131 * zero'd out.
132 */
133struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
134 const struct sctp_association *asoc,
135 __u16 flags, __u16 state, __u16 error, __u16 outbound,
136 __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp)
137{
138 struct sctp_ulpevent *event;
139 struct sctp_assoc_change *sac;
140 struct sk_buff *skb;
141
142 /* If the lower layer passed in the chunk, it will be
143 * an ABORT, so we need to include it in the sac_info.
144 */
145 if (chunk) {
146 /* Copy the chunk data to a new skb and reserve enough
147 * head room to use as notification.
148 */
149 skb = skb_copy_expand(chunk->skb,
150 sizeof(struct sctp_assoc_change), 0, gfp);
151
152 if (!skb)
153 goto fail;
154
155 /* Embed the event fields inside the cloned skb. */
156 event = sctp_skb2event(skb);
157 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
158
159 /* Include the notification structure */
160 sac = (struct sctp_assoc_change *)
161 skb_push(skb, sizeof(struct sctp_assoc_change));
162
163 /* Trim the buffer to the right length. */
164 skb_trim(skb, sizeof(struct sctp_assoc_change) +
165 ntohs(chunk->chunk_hdr->length) -
166 sizeof(sctp_chunkhdr_t));
167 } else {
168 event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
169 MSG_NOTIFICATION, gfp);
170 if (!event)
171 goto fail;
172
173 skb = sctp_event2skb(event);
174 sac = (struct sctp_assoc_change *) skb_put(skb,
175 sizeof(struct sctp_assoc_change));
176 }
177
178 /* Socket Extensions for SCTP
179 * 5.3.1.1 SCTP_ASSOC_CHANGE
180 *
181 * sac_type:
182 * It should be SCTP_ASSOC_CHANGE.
183 */
184 sac->sac_type = SCTP_ASSOC_CHANGE;
185
186 /* Socket Extensions for SCTP
187 * 5.3.1.1 SCTP_ASSOC_CHANGE
188 *
189 * sac_state: 32 bits (signed integer)
190 * This field holds one of a number of values that communicate the
191 * event that happened to the association.
192 */
193 sac->sac_state = state;
194
195 /* Socket Extensions for SCTP
196 * 5.3.1.1 SCTP_ASSOC_CHANGE
197 *
198 * sac_flags: 16 bits (unsigned integer)
199 * Currently unused.
200 */
201 sac->sac_flags = 0;
202
203 /* Socket Extensions for SCTP
204 * 5.3.1.1 SCTP_ASSOC_CHANGE
205 *
206 * sac_length: sizeof (__u32)
207 * This field is the total length of the notification data, including
208 * the notification header.
209 */
210 sac->sac_length = skb->len;
211
212 /* Socket Extensions for SCTP
213 * 5.3.1.1 SCTP_ASSOC_CHANGE
214 *
215 * sac_error: 32 bits (signed integer)
216 *
217 * If the state was reached due to a error condition (e.g.
218 * COMMUNICATION_LOST) any relevant error information is available in
219 * this field. This corresponds to the protocol error codes defined in
220 * [SCTP].
221 */
222 sac->sac_error = error;
223
224 /* Socket Extensions for SCTP
225 * 5.3.1.1 SCTP_ASSOC_CHANGE
226 *
227 * sac_outbound_streams: 16 bits (unsigned integer)
228 * sac_inbound_streams: 16 bits (unsigned integer)
229 *
230 * The maximum number of streams allowed in each direction are
231 * available in sac_outbound_streams and sac_inbound streams.
232 */
233 sac->sac_outbound_streams = outbound;
234 sac->sac_inbound_streams = inbound;
235
236 /* Socket Extensions for SCTP
237 * 5.3.1.1 SCTP_ASSOC_CHANGE
238 *
239 * sac_assoc_id: sizeof (sctp_assoc_t)
240 *
241 * The association id field, holds the identifier for the association.
242 * All notifications for a given association have the same association
243 * identifier. For TCP style socket, this field is ignored.
244 */
245 sctp_ulpevent_set_owner(event, asoc);
246 sac->sac_assoc_id = sctp_assoc2id(asoc);
247
248 return event;
249
250fail:
251 return NULL;
252}
253
254/* Create and initialize an SCTP_PEER_ADDR_CHANGE event.
255 *
256 * Socket Extensions for SCTP - draft-01
257 * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
258 *
259 * When a destination address on a multi-homed peer encounters a change
260 * an interface details event is sent.
261 */
262struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
263 const struct sctp_association *asoc,
264 const struct sockaddr_storage *aaddr,
265 int flags, int state, int error, gfp_t gfp)
266{
267 struct sctp_ulpevent *event;
268 struct sctp_paddr_change *spc;
269 struct sk_buff *skb;
270
271 event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change),
272 MSG_NOTIFICATION, gfp);
273 if (!event)
274 goto fail;
275
276 skb = sctp_event2skb(event);
277 spc = (struct sctp_paddr_change *)
278 skb_put(skb, sizeof(struct sctp_paddr_change));
279
280 /* Sockets API Extensions for SCTP
281 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
282 *
283 * spc_type:
284 *
285 * It should be SCTP_PEER_ADDR_CHANGE.
286 */
287 spc->spc_type = SCTP_PEER_ADDR_CHANGE;
288
289 /* Sockets API Extensions for SCTP
290 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
291 *
292 * spc_length: sizeof (__u32)
293 *
294 * This field is the total length of the notification data, including
295 * the notification header.
296 */
297 spc->spc_length = sizeof(struct sctp_paddr_change);
298
299 /* Sockets API Extensions for SCTP
300 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
301 *
302 * spc_flags: 16 bits (unsigned integer)
303 * Currently unused.
304 */
305 spc->spc_flags = 0;
306
307 /* Sockets API Extensions for SCTP
308 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
309 *
310 * spc_state: 32 bits (signed integer)
311 *
312 * This field holds one of a number of values that communicate the
313 * event that happened to the address.
314 */
315 spc->spc_state = state;
316
317 /* Sockets API Extensions for SCTP
318 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
319 *
320 * spc_error: 32 bits (signed integer)
321 *
322 * If the state was reached due to any error condition (e.g.
323 * ADDRESS_UNREACHABLE) any relevant error information is available in
324 * this field.
325 */
326 spc->spc_error = error;
327
328 /* Socket Extensions for SCTP
329 * 5.3.1.1 SCTP_ASSOC_CHANGE
330 *
331 * spc_assoc_id: sizeof (sctp_assoc_t)
332 *
333 * The association id field, holds the identifier for the association.
334 * All notifications for a given association have the same association
335 * identifier. For TCP style socket, this field is ignored.
336 */
337 sctp_ulpevent_set_owner(event, asoc);
338 spc->spc_assoc_id = sctp_assoc2id(asoc);
339
340 /* Sockets API Extensions for SCTP
341 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
342 *
343 * spc_aaddr: sizeof (struct sockaddr_storage)
344 *
345 * The affected address field, holds the remote peer's address that is
346 * encountering the change of state.
347 */
348 memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage));
349
350 /* Map ipv4 address into v4-mapped-on-v6 address. */
351 sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map(
352 sctp_sk(asoc->base.sk),
353 (union sctp_addr *)&spc->spc_aaddr);
354
355 return event;
356
357fail:
358 return NULL;
359}
360
361/* Create and initialize an SCTP_REMOTE_ERROR notification.
362 *
363 * Note: This assumes that the chunk->skb->data already points to the
364 * operation error payload.
365 *
366 * Socket Extensions for SCTP - draft-01
367 * 5.3.1.3 SCTP_REMOTE_ERROR
368 *
369 * A remote peer may send an Operational Error message to its peer.
370 * This message indicates a variety of error conditions on an
371 * association. The entire error TLV as it appears on the wire is
372 * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP
373 * specification [SCTP] and any extensions for a list of possible
374 * error formats.
375 */
376struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
377 const struct sctp_association *asoc, struct sctp_chunk *chunk,
378 __u16 flags, gfp_t gfp)
379{
380 struct sctp_ulpevent *event;
381 struct sctp_remote_error *sre;
382 struct sk_buff *skb;
383 sctp_errhdr_t *ch;
384 __be16 cause;
385 int elen;
386
387 ch = (sctp_errhdr_t *)(chunk->skb->data);
388 cause = ch->cause;
389 elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);
390
391 /* Pull off the ERROR header. */
392 skb_pull(chunk->skb, sizeof(sctp_errhdr_t));
393
394 /* Copy the skb to a new skb with room for us to prepend
395 * notification with.
396 */
397 skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error),
398 0, gfp);
399
400 /* Pull off the rest of the cause TLV from the chunk. */
401 skb_pull(chunk->skb, elen);
402 if (!skb)
403 goto fail;
404
405 /* Embed the event fields inside the cloned skb. */
406 event = sctp_skb2event(skb);
407 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
408
409 sre = (struct sctp_remote_error *)
410 skb_push(skb, sizeof(struct sctp_remote_error));
411
412 /* Trim the buffer to the right length. */
413 skb_trim(skb, sizeof(struct sctp_remote_error) + elen);
414
415 /* Socket Extensions for SCTP
416 * 5.3.1.3 SCTP_REMOTE_ERROR
417 *
418 * sre_type:
419 * It should be SCTP_REMOTE_ERROR.
420 */
421 sre->sre_type = SCTP_REMOTE_ERROR;
422
423 /*
424 * Socket Extensions for SCTP
425 * 5.3.1.3 SCTP_REMOTE_ERROR
426 *
427 * sre_flags: 16 bits (unsigned integer)
428 * Currently unused.
429 */
430 sre->sre_flags = 0;
431
432 /* Socket Extensions for SCTP
433 * 5.3.1.3 SCTP_REMOTE_ERROR
434 *
435 * sre_length: sizeof (__u32)
436 *
437 * This field is the total length of the notification data,
438 * including the notification header.
439 */
440 sre->sre_length = skb->len;
441
442 /* Socket Extensions for SCTP
443 * 5.3.1.3 SCTP_REMOTE_ERROR
444 *
445 * sre_error: 16 bits (unsigned integer)
446 * This value represents one of the Operational Error causes defined in
447 * the SCTP specification, in network byte order.
448 */
449 sre->sre_error = cause;
450
451 /* Socket Extensions for SCTP
452 * 5.3.1.3 SCTP_REMOTE_ERROR
453 *
454 * sre_assoc_id: sizeof (sctp_assoc_t)
455 *
456 * The association id field, holds the identifier for the association.
457 * All notifications for a given association have the same association
458 * identifier. For TCP style socket, this field is ignored.
459 */
460 sctp_ulpevent_set_owner(event, asoc);
461 sre->sre_assoc_id = sctp_assoc2id(asoc);
462
463 return event;
464
465fail:
466 return NULL;
467}
468
469/* Create and initialize a SCTP_SEND_FAILED notification.
470 *
471 * Socket Extensions for SCTP - draft-01
472 * 5.3.1.4 SCTP_SEND_FAILED
473 */
474struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
475 const struct sctp_association *asoc, struct sctp_chunk *chunk,
476 __u16 flags, __u32 error, gfp_t gfp)
477{
478 struct sctp_ulpevent *event;
479 struct sctp_send_failed *ssf;
480 struct sk_buff *skb;
481
482 /* Pull off any padding. */
483 int len = ntohs(chunk->chunk_hdr->length);
484
485 /* Make skb with more room so we can prepend notification. */
486 skb = skb_copy_expand(chunk->skb,
487 sizeof(struct sctp_send_failed), /* headroom */
488 0, /* tailroom */
489 gfp);
490 if (!skb)
491 goto fail;
492
493 /* Pull off the common chunk header and DATA header. */
494 skb_pull(skb, sizeof(struct sctp_data_chunk));
495 len -= sizeof(struct sctp_data_chunk);
496
497 /* Embed the event fields inside the cloned skb. */
498 event = sctp_skb2event(skb);
499 sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
500
501 ssf = (struct sctp_send_failed *)
502 skb_push(skb, sizeof(struct sctp_send_failed));
503
504 /* Socket Extensions for SCTP
505 * 5.3.1.4 SCTP_SEND_FAILED
506 *
507 * ssf_type:
508 * It should be SCTP_SEND_FAILED.
509 */
510 ssf->ssf_type = SCTP_SEND_FAILED;
511
512 /* Socket Extensions for SCTP
513 * 5.3.1.4 SCTP_SEND_FAILED
514 *
515 * ssf_flags: 16 bits (unsigned integer)
516 * The flag value will take one of the following values
517 *
518 * SCTP_DATA_UNSENT - Indicates that the data was never put on
519 * the wire.
520 *
521 * SCTP_DATA_SENT - Indicates that the data was put on the wire.
522 * Note that this does not necessarily mean that the
523 * data was (or was not) successfully delivered.
524 */
525 ssf->ssf_flags = flags;
526
527 /* Socket Extensions for SCTP
528 * 5.3.1.4 SCTP_SEND_FAILED
529 *
530 * ssf_length: sizeof (__u32)
531 * This field is the total length of the notification data, including
532 * the notification header.
533 */
534 ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
535 skb_trim(skb, ssf->ssf_length);
536
537 /* Socket Extensions for SCTP
538 * 5.3.1.4 SCTP_SEND_FAILED
539 *
540 * ssf_error: 16 bits (unsigned integer)
541 * This value represents the reason why the send failed, and if set,
542 * will be a SCTP protocol error code as defined in [SCTP] section
543 * 3.3.10.
544 */
545 ssf->ssf_error = error;
546
547 /* Socket Extensions for SCTP
548 * 5.3.1.4 SCTP_SEND_FAILED
549 *
550 * ssf_info: sizeof (struct sctp_sndrcvinfo)
551 * The original send information associated with the undelivered
552 * message.
553 */
554 memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));
555
556 /* Per TSVWG discussion with Randy. Allow the application to
557 * reassemble a fragmented message.
558 */
559 ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;
560
561 /* Socket Extensions for SCTP
562 * 5.3.1.4 SCTP_SEND_FAILED
563 *
564 * ssf_assoc_id: sizeof (sctp_assoc_t)
565 * The association id field, sf_assoc_id, holds the identifier for the
566 * association. All notifications for a given association have the
567 * same association identifier. For TCP style socket, this field is
568 * ignored.
569 */
570 sctp_ulpevent_set_owner(event, asoc);
571 ssf->ssf_assoc_id = sctp_assoc2id(asoc);
572 return event;
573
574fail:
575 return NULL;
576}
577
578/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
579 *
580 * Socket Extensions for SCTP - draft-01
581 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
582 */
583struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
584 const struct sctp_association *asoc,
585 __u16 flags, gfp_t gfp)
586{
587 struct sctp_ulpevent *event;
588 struct sctp_shutdown_event *sse;
589 struct sk_buff *skb;
590
591 event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
592 MSG_NOTIFICATION, gfp);
593 if (!event)
594 goto fail;
595
596 skb = sctp_event2skb(event);
597 sse = (struct sctp_shutdown_event *)
598 skb_put(skb, sizeof(struct sctp_shutdown_event));
599
600 /* Socket Extensions for SCTP
601 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
602 *
603 * sse_type
604 * It should be SCTP_SHUTDOWN_EVENT
605 */
606 sse->sse_type = SCTP_SHUTDOWN_EVENT;
607
608 /* Socket Extensions for SCTP
609 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
610 *
611 * sse_flags: 16 bits (unsigned integer)
612 * Currently unused.
613 */
614 sse->sse_flags = 0;
615
616 /* Socket Extensions for SCTP
617 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
618 *
619 * sse_length: sizeof (__u32)
620 * This field is the total length of the notification data, including
621 * the notification header.
622 */
623 sse->sse_length = sizeof(struct sctp_shutdown_event);
624
625 /* Socket Extensions for SCTP
626 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
627 *
628 * sse_assoc_id: sizeof (sctp_assoc_t)
629 * The association id field, holds the identifier for the association.
630 * All notifications for a given association have the same association
631 * identifier. For TCP style socket, this field is ignored.
632 */
633 sctp_ulpevent_set_owner(event, asoc);
634 sse->sse_assoc_id = sctp_assoc2id(asoc);
635
636 return event;
637
638fail:
639 return NULL;
640}
641
642/* Create and initialize a SCTP_ADAPTATION_INDICATION notification.
643 *
644 * Socket Extensions for SCTP
645 * 5.3.1.6 SCTP_ADAPTATION_INDICATION
646 */
647struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
648 const struct sctp_association *asoc, gfp_t gfp)
649{
650 struct sctp_ulpevent *event;
651 struct sctp_adaptation_event *sai;
652 struct sk_buff *skb;
653
654 event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event),
655 MSG_NOTIFICATION, gfp);
656 if (!event)
657 goto fail;
658
659 skb = sctp_event2skb(event);
660 sai = (struct sctp_adaptation_event *)
661 skb_put(skb, sizeof(struct sctp_adaptation_event));
662
663 sai->sai_type = SCTP_ADAPTATION_INDICATION;
664 sai->sai_flags = 0;
665 sai->sai_length = sizeof(struct sctp_adaptation_event);
666 sai->sai_adaptation_ind = asoc->peer.adaptation_ind;
667 sctp_ulpevent_set_owner(event, asoc);
668 sai->sai_assoc_id = sctp_assoc2id(asoc);
669
670 return event;
671
672fail:
673 return NULL;
674}
675
676/* A message has been received. Package this message as a notification
677 * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo
678 * even if filtered out later.
679 *
680 * Socket Extensions for SCTP
681 * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
682 */
683struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
684 struct sctp_chunk *chunk,
685 gfp_t gfp)
686{
687 struct sctp_ulpevent *event = NULL;
688 struct sk_buff *skb;
689 size_t padding, len;
690 int rx_count;
691
692 /*
693 * check to see if we need to make space for this
694 * new skb, expand the rcvbuffer if needed, or drop
695 * the frame
696 */
697 if (asoc->ep->rcvbuf_policy)
698 rx_count = atomic_read(&asoc->rmem_alloc);
699 else
700 rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc);
701
702 if (rx_count >= asoc->base.sk->sk_rcvbuf) {
703
704 if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
705 (!sk_rmem_schedule(asoc->base.sk, chunk->skb->truesize)))
706 goto fail;
707 }
708
709 /* Clone the original skb, sharing the data. */
710 skb = skb_clone(chunk->skb, gfp);
711 if (!skb)
712 goto fail;
713
714 /* Now that all memory allocations for this chunk succeeded, we
715 * can mark it as received so the tsn_map is updated correctly.
716 */
717 if (sctp_tsnmap_mark(&asoc->peer.tsn_map,
718 ntohl(chunk->subh.data_hdr->tsn)))
719 goto fail_mark;
720
721 /* First calculate the padding, so we don't inadvertently
722 * pass up the wrong length to the user.
723 *
724 * RFC 2960 - Section 3.2 Chunk Field Descriptions
725 *
726 * The total length of a chunk(including Type, Length and Value fields)
727 * MUST be a multiple of 4 bytes. If the length of the chunk is not a
728 * multiple of 4 bytes, the sender MUST pad the chunk with all zero
729 * bytes and this padding is not included in the chunk length field.
730 * The sender should never pad with more than 3 bytes. The receiver
731 * MUST ignore the padding bytes.
732 */
733 len = ntohs(chunk->chunk_hdr->length);
734 padding = WORD_ROUND(len) - len;
735
736 /* Fixup cloned skb with just this chunks data. */
737 skb_trim(skb, chunk->chunk_end - padding - skb->data);
738
739 /* Embed the event fields inside the cloned skb. */
740 event = sctp_skb2event(skb);
741
742 /* Initialize event with flags 0 and correct length
743 * Since this is a clone of the original skb, only account for
744 * the data of this chunk as other chunks will be accounted separately.
745 */
746 sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
747
748 sctp_ulpevent_receive_data(event, asoc);
749
750 event->stream = ntohs(chunk->subh.data_hdr->stream);
751 event->ssn = ntohs(chunk->subh.data_hdr->ssn);
752 event->ppid = chunk->subh.data_hdr->ppid;
753 if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
754 event->flags |= SCTP_UNORDERED;
755 event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
756 }
757 event->tsn = ntohl(chunk->subh.data_hdr->tsn);
758 event->msg_flags |= chunk->chunk_hdr->flags;
759 event->iif = sctp_chunk_iif(chunk);
760
761 return event;
762
763fail_mark:
764 kfree_skb(skb);
765fail:
766 return NULL;
767}
768
769/* Create a partial delivery related event.
770 *
771 * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
772 *
773 * When a receiver is engaged in a partial delivery of a
774 * message this notification will be used to indicate
775 * various events.
776 */
777struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
778 const struct sctp_association *asoc, __u32 indication,
779 gfp_t gfp)
780{
781 struct sctp_ulpevent *event;
782 struct sctp_pdapi_event *pd;
783 struct sk_buff *skb;
784
785 event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
786 MSG_NOTIFICATION, gfp);
787 if (!event)
788 goto fail;
789
790 skb = sctp_event2skb(event);
791 pd = (struct sctp_pdapi_event *)
792 skb_put(skb, sizeof(struct sctp_pdapi_event));
793
794 /* pdapi_type
795 * It should be SCTP_PARTIAL_DELIVERY_EVENT
796 *
797 * pdapi_flags: 16 bits (unsigned integer)
798 * Currently unused.
799 */
800 pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
801 pd->pdapi_flags = 0;
802
803 /* pdapi_length: 32 bits (unsigned integer)
804 *
805 * This field is the total length of the notification data, including
806 * the notification header. It will generally be sizeof (struct
807 * sctp_pdapi_event).
808 */
809 pd->pdapi_length = sizeof(struct sctp_pdapi_event);
810
811 /* pdapi_indication: 32 bits (unsigned integer)
812 *
813 * This field holds the indication being sent to the application.
814 */
815 pd->pdapi_indication = indication;
816
817 /* pdapi_assoc_id: sizeof (sctp_assoc_t)
818 *
819 * The association id field, holds the identifier for the association.
820 */
821 sctp_ulpevent_set_owner(event, asoc);
822 pd->pdapi_assoc_id = sctp_assoc2id(asoc);
823
824 return event;
825fail:
826 return NULL;
827}
828
829struct sctp_ulpevent *sctp_ulpevent_make_authkey(
830 const struct sctp_association *asoc, __u16 key_id,
831 __u32 indication, gfp_t gfp)
832{
833 struct sctp_ulpevent *event;
834 struct sctp_authkey_event *ak;
835 struct sk_buff *skb;
836
837 event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
838 MSG_NOTIFICATION, gfp);
839 if (!event)
840 goto fail;
841
842 skb = sctp_event2skb(event);
843 ak = (struct sctp_authkey_event *)
844 skb_put(skb, sizeof(struct sctp_authkey_event));
845
846 ak->auth_type = SCTP_AUTHENTICATION_EVENT;
847 ak->auth_flags = 0;
848 ak->auth_length = sizeof(struct sctp_authkey_event);
849
850 ak->auth_keynumber = key_id;
851 ak->auth_altkeynumber = 0;
852 ak->auth_indication = indication;
853
854 /*
855 * The association id field, holds the identifier for the association.
856 */
857 sctp_ulpevent_set_owner(event, asoc);
858 ak->auth_assoc_id = sctp_assoc2id(asoc);
859
860 return event;
861fail:
862 return NULL;
863}
864
865/*
866 * Socket Extensions for SCTP
867 * 6.3.10. SCTP_SENDER_DRY_EVENT
868 */
869struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
870 const struct sctp_association *asoc, gfp_t gfp)
871{
872 struct sctp_ulpevent *event;
873 struct sctp_sender_dry_event *sdry;
874 struct sk_buff *skb;
875
876 event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
877 MSG_NOTIFICATION, gfp);
878 if (!event)
879 return NULL;
880
881 skb = sctp_event2skb(event);
882 sdry = (struct sctp_sender_dry_event *)
883 skb_put(skb, sizeof(struct sctp_sender_dry_event));
884
885 sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
886 sdry->sender_dry_flags = 0;
887 sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
888 sctp_ulpevent_set_owner(event, asoc);
889 sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
890
891 return event;
892}
893
894/* Return the notification type, assuming this is a notification
895 * event.
896 */
897__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
898{
899 union sctp_notification *notification;
900 struct sk_buff *skb;
901
902 skb = sctp_event2skb(event);
903 notification = (union sctp_notification *) skb->data;
904 return notification->sn_header.sn_type;
905}
906
907/* Copy out the sndrcvinfo into a msghdr. */
908void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
909 struct msghdr *msghdr)
910{
911 struct sctp_sndrcvinfo sinfo;
912
913 if (sctp_ulpevent_is_notification(event))
914 return;
915
916 /* Sockets API Extensions for SCTP
917 * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
918 *
919 * sinfo_stream: 16 bits (unsigned integer)
920 *
921 * For recvmsg() the SCTP stack places the message's stream number in
922 * this value.
923 */
924 sinfo.sinfo_stream = event->stream;
925 /* sinfo_ssn: 16 bits (unsigned integer)
926 *
927 * For recvmsg() this value contains the stream sequence number that
928 * the remote endpoint placed in the DATA chunk. For fragmented
929 * messages this is the same number for all deliveries of the message
930 * (if more than one recvmsg() is needed to read the message).
931 */
932 sinfo.sinfo_ssn = event->ssn;
933 /* sinfo_ppid: 32 bits (unsigned integer)
934 *
935 * In recvmsg() this value is
936 * the same information that was passed by the upper layer in the peer
937 * application. Please note that byte order issues are NOT accounted
938 * for and this information is passed opaquely by the SCTP stack from
939 * one end to the other.
940 */
941 sinfo.sinfo_ppid = event->ppid;
942 /* sinfo_flags: 16 bits (unsigned integer)
943 *
944 * This field may contain any of the following flags and is composed of
945 * a bitwise OR of these values.
946 *
947 * recvmsg() flags:
948 *
949 * SCTP_UNORDERED - This flag is present when the message was sent
950 * non-ordered.
951 */
952 sinfo.sinfo_flags = event->flags;
953 /* sinfo_tsn: 32 bit (unsigned integer)
954 *
955 * For the receiving side, this field holds a TSN that was
956 * assigned to one of the SCTP Data Chunks.
957 */
958 sinfo.sinfo_tsn = event->tsn;
959 /* sinfo_cumtsn: 32 bit (unsigned integer)
960 *
961 * This field will hold the current cumulative TSN as
962 * known by the underlying SCTP layer. Note this field is
963 * ignored when sending and only valid for a receive
964 * operation when sinfo_flags are set to SCTP_UNORDERED.
965 */
966 sinfo.sinfo_cumtsn = event->cumtsn;
967 /* sinfo_assoc_id: sizeof (sctp_assoc_t)
968 *
969 * The association handle field, sinfo_assoc_id, holds the identifier
970 * for the association announced in the COMMUNICATION_UP notification.
971 * All notifications for a given association have the same identifier.
972 * Ignored for one-to-one style sockets.
973 */
974 sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
975
976 /* context value that is set via SCTP_CONTEXT socket option. */
977 sinfo.sinfo_context = event->asoc->default_rcv_context;
978
979 /* These fields are not used while receiving. */
980 sinfo.sinfo_timetolive = 0;
981
982 put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
983 sizeof(struct sctp_sndrcvinfo), (void *)&sinfo);
984}
985
986/* Do accounting for bytes received and hold a reference to the association
987 * for each skb.
988 */
989static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
990 struct sctp_association *asoc)
991{
992 struct sk_buff *skb, *frag;
993
994 skb = sctp_event2skb(event);
995 /* Set the owner and charge rwnd for bytes received. */
996 sctp_ulpevent_set_owner(event, asoc);
997 sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));
998
999 if (!skb->data_len)
1000 return;
1001
1002 /* Note: Not clearing the entire event struct as this is just a
1003 * fragment of the real event. However, we still need to do rwnd
1004 * accounting.
1005 * In general, the skb passed from IP can have only 1 level of
1006 * fragments. But we allow multiple levels of fragments.
1007 */
1008 skb_walk_frags(skb, frag)
1009 sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
1010}
1011
1012/* Do accounting for bytes just read by user and release the references to
1013 * the association.
1014 */
1015static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
1016{
1017 struct sk_buff *skb, *frag;
1018 unsigned int len;
1019
1020 /* Current stack structures assume that the rcv buffer is
1021 * per socket. For UDP style sockets this is not true as
1022 * multiple associations may be on a single UDP-style socket.
1023 * Use the local private area of the skb to track the owning
1024 * association.
1025 */
1026
1027 skb = sctp_event2skb(event);
1028 len = skb->len;
1029
1030 if (!skb->data_len)
1031 goto done;
1032
1033 /* Don't forget the fragments. */
1034 skb_walk_frags(skb, frag) {
1035 /* NOTE: skb_shinfos are recursive. Although IP returns
1036 * skb's with only 1 level of fragments, SCTP reassembly can
1037 * increase the levels.
1038 */
1039 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1040 }
1041
1042done:
1043 sctp_assoc_rwnd_increase(event->asoc, len);
1044 sctp_ulpevent_release_owner(event);
1045}
1046
1047static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
1048{
1049 struct sk_buff *skb, *frag;
1050
1051 skb = sctp_event2skb(event);
1052
1053 if (!skb->data_len)
1054 goto done;
1055
1056 /* Don't forget the fragments. */
1057 skb_walk_frags(skb, frag) {
1058 /* NOTE: skb_shinfos are recursive. Although IP returns
1059 * skb's with only 1 level of fragments, SCTP reassembly can
1060 * increase the levels.
1061 */
1062 sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
1063 }
1064
1065done:
1066 sctp_ulpevent_release_owner(event);
1067}
1068
1069/* Free a ulpevent that has an owner. It includes releasing the reference
1070 * to the owner, updating the rwnd in case of a DATA event and freeing the
1071 * skb.
1072 */
1073void sctp_ulpevent_free(struct sctp_ulpevent *event)
1074{
1075 if (sctp_ulpevent_is_notification(event))
1076 sctp_ulpevent_release_owner(event);
1077 else
1078 sctp_ulpevent_release_data(event);
1079
1080 kfree_skb(sctp_event2skb(event));
1081}
1082
1083/* Purge the skb lists holding ulpevents. */
1084unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list)
1085{
1086 struct sk_buff *skb;
1087 unsigned int data_unread = 0;
1088
1089 while ((skb = skb_dequeue(list)) != NULL) {
1090 struct sctp_ulpevent *event = sctp_skb2event(skb);
1091
1092 if (!sctp_ulpevent_is_notification(event))
1093 data_unread += skb->len;
1094
1095 sctp_ulpevent_free(event);
1096 }
1097
1098 return data_unread;
1099}