aboutsummaryrefslogtreecommitdiffstats
path: root/net/sctp/ulpevent.c
blob: ee236784a6bb91ea8bbf3787b776aabf65971ae9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
/* SCTP kernel reference Implementation
 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001 Intel Corp.
 * Copyright (c) 2001 Nokia, Inc.
 * Copyright (c) 2001 La Monte H.P. Yarroll
 *
 * These functions manipulate an sctp event.   The struct ulpevent is used
 * to carry notifications and data to the ULP (sockets).
 * The SCTP reference implementation is free software;
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * The SCTP reference implementation is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
 *
 * Or submit a bug report through the following website:
 *    http://www.sf.net/projects/lksctp
 *
 * Written or modified by:
 *    Jon Grimm             <jgrimm@us.ibm.com>
 *    La Monte H.P. Yarroll <piggy@acm.org>
 *    Ardelle Fan	    <ardelle.fan@intel.com>
 *    Sridhar Samudrala     <sri@us.ibm.com>
 *
 * Any bugs reported given to us we will try to fix... any fixes shared will
 * be incorporated into the next SCTP release.
 */

#include <linux/types.h>
#include <linux/skbuff.h>
#include <net/sctp/structs.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>

static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
				       struct sctp_association *asoc);
static void sctp_ulpevent_release_data(struct sctp_ulpevent *event);
static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event);


/* Initialize an ULP event from an given skb.  */
SCTP_STATIC void sctp_ulpevent_init(struct sctp_ulpevent *event, int msg_flags)
{
	memset(event, 0, sizeof(struct sctp_ulpevent));
	event->msg_flags = msg_flags;
}

/* Create a new sctp_ulpevent.  */
SCTP_STATIC struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags,
						    gfp_t gfp)
{
	struct sctp_ulpevent *event;
	struct sk_buff *skb;

	skb = alloc_skb(size, gfp);
	if (!skb)
		goto fail;

	event = sctp_skb2event(skb);
	sctp_ulpevent_init(event, msg_flags);

	return event;

fail:
	return NULL;
}

/* Is this a MSG_NOTIFICATION?  */
int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event)
{
	return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION);
}

/* Hold the association in case the msg_name needs read out of
 * the association.
 */
static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event,
					   const struct sctp_association *asoc)
{
	struct sk_buff *skb;

	/* Cast away the const, as we are just wanting to
	 * bump the reference count.
	 */
	sctp_association_hold((struct sctp_association *)asoc);
	skb = sctp_event2skb(event);
	event->asoc = (struct sctp_association *)asoc;
	atomic_add(skb->truesize, &event->asoc->rmem_alloc);
	skb_set_owner_r(skb, asoc->base.sk);
}

/* A simple destructor to give up the reference to the association. */
static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event)
{
	struct sctp_association *asoc = event->asoc;
	struct sk_buff *skb = sctp_event2skb(event);

	atomic_sub(skb->truesize, &asoc->rmem_alloc);
	sctp_association_put(asoc);
}

/* Create and initialize an SCTP_ASSOC_CHANGE event.
 *
 * 5.3.1.1 SCTP_ASSOC_CHANGE
 *
 * Communication notifications inform the ULP that an SCTP association
 * has either begun or ended. The identifier for a new association is
 * provided by this notification.
 *
 * Note: There is no field checking here.  If a field is unused it will be
 * zero'd out.
 */
struct sctp_ulpevent  *sctp_ulpevent_make_assoc_change(
	const struct sctp_association *asoc,
	__u16 flags, __u16 state, __u16 error, __u16 outbound,
	__u16 inbound, gfp_t gfp)
{
	struct sctp_ulpevent *event;
	struct sctp_assoc_change *sac;
	struct sk_buff *skb;

	event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
				  MSG_NOTIFICATION, gfp);
	if (!event)
		goto fail;
	skb = sctp_event2skb(event);
	sac = (struct sctp_assoc_change *)
		skb_put(skb, sizeof(struct sctp_assoc_change));

	/* Socket Extensions for SCTP
	 * 5.3.1.1 SCTP_ASSOC_CHANGE
	 *
	 * sac_type:
	 * It should be SCTP_ASSOC_CHANGE.
	 */
	sac->sac_type = SCTP_ASSOC_CHANGE;

	/* Socket Extensions for SCTP
	 * 5.3.1.1 SCTP_ASSOC_CHANGE
	 *
	 * sac_state: 32 bits (signed integer)
	 * This field holds one of a number of values that communicate the
	 * event that happened to the association.
	 */
	sac->sac_state = state;

	/* Socket Extensions for SCTP
	 * 5.3.1.1 SCTP_ASSOC_CHANGE
	 *
	 * sac_flags: 16 bits (unsigned integer)
	 * Currently unused.
	 */
	sac->sac_flags = 0;

	/* Socket Extensions for SCTP
	 * 5.3.1.1 SCTP_ASSOC_CHANGE
	 *
	 * sac_length: sizeof (__u32)
	 * This field is the total length of the notification data, including
	 * the notification header.
	 */
	sac->sac_length = sizeof(struct sctp_assoc_change);

	/* Socket Extensions for SCTP
	 * 5.3.1.1 SCTP_ASSOC_CHANGE
	 *
	 * sac_error:  32 bits (signed integer)
	 *
	 * If the state was reached due to a error condition (e.g.
	 * COMMUNICATION_LOST) any relevant error information is available in
	 * this field. This corresponds to the protocol error codes defined in
	 * [SCTP].
	 */
	sac->sac_error = error;

	/* Socket Extensions for SCTP
	 * 5.3.1.1 SCTP_ASSOC_CHANGE
	 *
	 * sac_outbound_streams:  16 bits (unsigned integer)
	 * sac_inbound_streams:  16 bits (unsigned integer)
	 *
	 * The maximum number of streams allowed in each direction are
	 * available in sac_outbound_streams and sac_inbound streams.
	 */
	sac->sac_outbound_streams = outbound;
	sac->sac_inbound_streams = inbound;

	/* Socket Extensions for SCTP
	 * 5.3.1.1 SCTP_ASSOC_CHANGE
	 *
	 * sac_assoc_id: sizeof (sctp_assoc_t)
	 *
	 * The association id field, holds the identifier for the association.
	 * All notifications for a given association have the same association
	 * identifier.  For TCP style socket, this field is ignored.
	 */
	sctp_ulpevent_set_owner(event, asoc);
	sac->sac_assoc_id = sctp_assoc2id(asoc);

	return event;

fail:
	return NULL;
}

/* Create and initialize an SCTP_PEER_ADDR_CHANGE event.
 *
 * Socket Extensions for SCTP - draft-01
 * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
 *
 * When a destination address on a multi-homed peer encounters a change
 * an interface details event is sent.
 */
struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
	const struct sctp_association *asoc,
	const struct sockaddr_storage *aaddr,
	int flags, int state, int error, gfp_t gfp)
{
	struct sctp_ulpevent *event;
	struct sctp_paddr_change  *spc;
	struct sk_buff *skb;

	event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change),
				  MSG_NOTIFICATION, gfp);
	if (!event)
		goto fail;

	skb = sctp_event2skb(event);
	spc = (struct sctp_paddr_change *)
		skb_put(skb, sizeof(struct sctp_paddr_change));

	/* Sockets API Extensions for SCTP
	 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
	 *
	 * spc_type:
	 *
	 *    It should be SCTP_PEER_ADDR_CHANGE.
	 */
	spc->spc_type = SCTP_PEER_ADDR_CHANGE;

	/* Sockets API Extensions for SCTP
	 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
	 *
	 * spc_length: sizeof (__u32)
	 *
	 * This field is the total length of the notification data, including
	 * the notification header.
	 */
	spc->spc_length = sizeof(struct sctp_paddr_change);

	/* Sockets API Extensions for SCTP
	 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
	 *
	 * spc_flags: 16 bits (unsigned integer)
	 * Currently unused.
	 */
	spc->spc_flags = 0;

	/* Sockets API Extensions for SCTP
	 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
	 *
	 * spc_state:  32 bits (signed integer)
	 *
	 * This field holds one of a number of values that communicate the
	 * event that happened to the address.
	 */
	spc->spc_state = state;

	/* Sockets API Extensions for SCTP
	 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
	 *
	 * spc_error:  32 bits (signed integer)
	 *
	 * If the state was reached due to any error condition (e.g.
	 * ADDRESS_UNREACHABLE) any relevant error information is available in
	 * this field.
	 */
	spc->spc_error = error;

	/* Socket Extensions for SCTP
	 * 5.3.1.1 SCTP_ASSOC_CHANGE
	 *
	 * spc_assoc_id: sizeof (sctp_assoc_t)
	 *
	 * The association id field, holds the identifier for the association.
	 * All notifications for a given association have the same association
	 * identifier.  For TCP style socket, this field is ignored.
	 */
	sctp_ulpevent_set_owner(event, asoc);
	spc->spc_assoc_id = sctp_assoc2id(asoc);

	/* Sockets API Extensions for SCTP
	 * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
	 *
	 * spc_aaddr: sizeof (struct sockaddr_storage)
	 *
	 * The affected address field, holds the remote peer's address that is
	 * encountering the change of state.
	 */
	memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage));

	/* Map ipv4 address into v4-mapped-on-v6 address.  */
	sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map(
					sctp_sk(asoc->base.sk),
					(union sctp_addr *)&spc->spc_aaddr);

	return event;

fail:
	return NULL;
}

/* Create and initialize an SCTP_REMOTE_ERROR notification.
 *
 * Note: This assumes that the chunk->skb->data already points to the
 * operation error payload.
 *
 * Socket Extensions for SCTP - draft-01
 * 5.3.1.3 SCTP_REMOTE_ERROR
 *
 * A remote peer may send an Operational Error message to its peer.
 * This message indicates a variety of error conditions on an
 * association. The entire error TLV as it appears on the wire is
 * included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
 * specification [SCTP] and any extensions for a list of possible
 * error formats.
 */
struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
	const struct sctp_association *asoc, struct sctp_chunk *chunk,
	__u16 flags, gfp_t gfp)
{
	struct sctp_ulpevent *event;
	struct sctp_remote_error *sre;
	struct sk_buff *skb;
	sctp_errhdr_t *ch;
	__u16 cause;
	int elen;

	ch = (sctp_errhdr_t *)(chunk->skb->data);
	cause = ch->cause;
	elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);

	/* Pull off the ERROR header.  */
	skb_pull(chunk->skb, sizeof(sctp_errhdr_t));

	/* Copy the skb to a new skb with room for us to prepend
	 * notification with.
	 */
	skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error),
			      0, gfp);

	/* Pull off the rest of the cause TLV from the chunk.  */
	skb_pull(chunk->skb, elen);
	if (!skb)
		goto fail;

	/* Embed the event fields inside the cloned skb.  */
	event = sctp_skb2event(skb);
	sctp_ulpevent_init(event, MSG_NOTIFICATION);

	sre = (struct sctp_remote_error *)
		skb_push(skb, sizeof(struct sctp_remote_error));

	/* Trim the buffer to the right length.  */
	skb_trim(skb, sizeof(struct sctp_remote_error) + elen);

	/* Socket Extensions for SCTP
	 * 5.3.1.3 SCTP_REMOTE_ERROR
	 *
	 * sre_type:
	 *   It should be SCTP_REMOTE_ERROR.
	 */
	sre->sre_type = SCTP_REMOTE_ERROR;

	/*
	 * Socket Extensions for SCTP
	 * 5.3.1.3 SCTP_REMOTE_ERROR
	 *
	 * sre_flags: 16 bits (unsigned integer)
	 *   Currently unused.
	 */
	sre->sre_flags = 0;

	/* Socket Extensions for SCTP
	 * 5.3.1.3 SCTP_REMOTE_ERROR
	 *
	 * sre_length: sizeof (__u32)
	 *
	 * This field is the total length of the notification data,
	 * including the notification header.
	 */
	sre->sre_length = skb->len;

	/* Socket Extensions for SCTP
	 * 5.3.1.3 SCTP_REMOTE_ERROR
	 *
	 * sre_error: 16 bits (unsigned integer)
	 * This value represents one of the Operational Error causes defined in
	 * the SCTP specification, in network byte order.
	 */
	sre->sre_error = cause;

	/* Socket Extensions for SCTP
	 * 5.3.1.3 SCTP_REMOTE_ERROR
	 *
	 * sre_assoc_id: sizeof (sctp_assoc_t)
	 *
	 * The association id field, holds the identifier for the association.
	 * All notifications for a given association have the same association
	 * identifier.  For TCP style socket, this field is ignored.
	 */
	sctp_ulpevent_set_owner(event, asoc);
	sre->sre_assoc_id = sctp_assoc2id(asoc);

	return event;

fail:
	return NULL;
}

/* Create and initialize a SCTP_SEND_FAILED notification.
 *
 * Socket Extensions for SCTP - draft-01
 * 5.3.1.4 SCTP_SEND_FAILED
 */
struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
	const struct sctp_association *asoc, struct sctp_chunk *chunk,
	__u16 flags, __u32 error, gfp_t gfp)
{
	struct sctp_ulpevent *event;
	struct sctp_send_failed *ssf;
	struct sk_buff *skb;

	/* Pull off any padding. */
	int len = ntohs(chunk->chunk_hdr->length);

	/* Make skb with more room so we can prepend notification.  */
	skb = skb_copy_expand(chunk->skb,
			      sizeof(struct sctp_send_failed), /* headroom */
			      0,                               /* tailroom */
			      gfp);
	if (!skb)
		goto fail;

	/* Pull off the common chunk header and DATA header.  */
	skb_pull(skb, sizeof(struct sctp_data_chunk));
	len -= sizeof(struct sctp_data_chunk);

	/* Embed the event fields inside the cloned skb.  */
	event = sctp_skb2event(skb);
	sctp_ulpevent_init(event, MSG_NOTIFICATION);

	ssf = (struct sctp_send_failed *)
		skb_push(skb, sizeof(struct sctp_send_failed));

	/* Socket Extensions for SCTP
	 * 5.3.1.4 SCTP_SEND_FAILED
	 *
	 * ssf_type:
	 * It should be SCTP_SEND_FAILED.
	 */
	ssf->ssf_type = SCTP_SEND_FAILED;

	/* Socket Extensions for SCTP
	 * 5.3.1.4 SCTP_SEND_FAILED
	 *
	 * ssf_flags: 16 bits (unsigned integer)
	 * The flag value will take one of the following values
	 *
	 * SCTP_DATA_UNSENT - Indicates that the data was never put on
	 *                    the wire.
	 *
	 * SCTP_DATA_SENT   - Indicates that the data was put on the wire.
	 *                    Note that this does not necessarily mean that the
	 *                    data was (or was not) successfully delivered.
	 */
	ssf->ssf_flags = flags;

	/* Socket Extensions for SCTP
	 * 5.3.1.4 SCTP_SEND_FAILED
	 *
	 * ssf_length: sizeof (__u32)
	 * This field is the total length of the notification data, including
	 * the notification header.
	 */
	ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
	skb_trim(skb, ssf->ssf_length);

	/* Socket Extensions for SCTP
	 * 5.3.1.4 SCTP_SEND_FAILED
	 *
	 * ssf_error: 16 bits (unsigned integer)
	 * This value represents the reason why the send failed, and if set,
	 * will be a SCTP protocol error code as defined in [SCTP] section
	 * 3.3.10.
	 */
	ssf->ssf_error = error;

	/* Socket Extensions for SCTP
	 * 5.3.1.4 SCTP_SEND_FAILED
	 *
	 * ssf_info: sizeof (struct sctp_sndrcvinfo)
	 * The original send information associated with the undelivered
	 * message.
	 */
	memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));

	/* Per TSVWG discussion with Randy. Allow the application to
	 * ressemble a fragmented message.
	 */
	ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;

	/* Socket Extensions for SCTP
	 * 5.3.1.4 SCTP_SEND_FAILED
	 *
	 * ssf_assoc_id: sizeof (sctp_assoc_t)
	 * The association id field, sf_assoc_id, holds the identifier for the
	 * association.  All notifications for a given association have the
	 * same association identifier.  For TCP style socket, this field is
	 * ignored.
	 */
	sctp_ulpevent_set_owner(event, asoc);
	ssf->ssf_assoc_id = sctp_assoc2id(asoc);
	return event;

fail:
	return NULL;
}

/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
 *
 * Socket Extensions for SCTP - draft-01
 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
 */
struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
	const struct sctp_association *asoc,
	__u16 flags, gfp_t gfp)
{
	struct sctp_ulpevent *event;
	struct sctp_shutdown_event *sse;
	struct sk_buff *skb;

	event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
				  MSG_NOTIFICATION, gfp);
	if (!event)
		goto fail;

	skb = sctp_event2skb(event);
	sse = (struct sctp_shutdown_event *)
		skb_put(skb, sizeof(struct sctp_shutdown_event));

	/* Socket Extensions for SCTP
	 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
	 *
	 * sse_type
	 * It should be SCTP_SHUTDOWN_EVENT
	 */
	sse->sse_type = SCTP_SHUTDOWN_EVENT;

	/* Socket Extensions for SCTP
	 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
	 *
	 * sse_flags: 16 bits (unsigned integer)
	 * Currently unused.
	 */
	sse->sse_flags = 0;

	/* Socket Extensions for SCTP
	 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
	 *
	 * sse_length: sizeof (__u32)
	 * This field is the total length of the notification data, including
	 * the notification header.
	 */
	sse->sse_length = sizeof(struct sctp_shutdown_event);

	/* Socket Extensions for SCTP
	 * 5.3.1.5 SCTP_SHUTDOWN_EVENT
	 *
	 * sse_assoc_id: sizeof (sctp_assoc_t)
	 * The association id field, holds the identifier for the association.
	 * All notifications for a given association have the same association
	 * identifier.  For TCP style socket, this field is ignored.
	 */
	sctp_ulpevent_set_owner(event, asoc);
	sse->sse_assoc_id = sctp_assoc2id(asoc);

	return event;

fail:
	return NULL;
}

/* Create and initialize a SCTP_ADAPTION_INDICATION notification.
 *
 * Socket Extensions for SCTP
 * 5.3.1.6 SCTP_ADAPTION_INDICATION
 */
struct sctp_ulpevent *sctp_ulpevent_make_adaption_indication(
	const struct sctp_association *asoc, gfp_t gfp)
{
	struct sctp_ulpevent *event;
	struct sctp_adaption_event *sai;
	struct sk_buff *skb;

	event = sctp_ulpevent_new(sizeof(struct sctp_adaption_event),
				  MSG_NOTIFICATION, gfp);
	if (!event)
		goto fail;

	skb = sctp_event2skb(event);
	sai = (struct sctp_adaption_event *)
		skb_put(skb, sizeof(struct sctp_adaption_event));

	sai->sai_type = SCTP_ADAPTION_INDICATION;
	sai->sai_flags = 0;
	sai->sai_length = sizeof(struct sctp_adaption_event);
	sai->sai_adaption_ind = asoc->peer.adaption_ind;
	sctp_ulpevent_set_owner(event, asoc);
	sai->sai_assoc_id = sctp_assoc2id(asoc);

	return event;

fail:
	return NULL;
}

/* A message has been received.  Package this message as a notification
 * to pass it to the upper layers.  Go ahead and calculate the sndrcvinfo
 * even if filtered out later.
 *
 * Socket Extensions for SCTP
 * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
 */
struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
						struct sctp_chunk *chunk,
						gfp_t gfp)
{
	struct sctp_ulpevent *event = NULL;
	struct sk_buff *skb;
	size_t padding, len;

	/* Clone the original skb, sharing the data.  */
	skb = skb_clone(chunk->skb, gfp);
	if (!skb)
		goto fail;

	/* First calculate the padding, so we don't inadvertently
	 * pass up the wrong length to the user.
	 *
	 * RFC 2960 - Section 3.2  Chunk Field Descriptions
	 *
	 * The total length of a chunk(including Type, Length and Value fields)
	 * MUST be a multiple of 4 bytes.  If the length of the chunk is not a
	 * multiple of 4 bytes, the sender MUST pad the chunk with all zero
	 * bytes and this padding is not included in the chunk length field.
	 * The sender should never pad with more than 3 bytes.  The receiver
	 * MUST ignore the padding bytes.
	 */
	len = ntohs(chunk->chunk_hdr->length);
	padding = WORD_ROUND(len) - len;

	/* Fixup cloned skb with just this chunks data.  */
	skb_trim(skb, chunk->chunk_end - padding - skb->data);

	/* Embed the event fields inside the cloned skb.  */
	event = sctp_skb2event(skb);

	/* Initialize event with flags 0.  */
	sctp_ulpevent_init(event, 0);

	sctp_ulpevent_receive_data(event, asoc);

	event->stream = ntohs(chunk->subh.data_hdr->stream);
	event->ssn = ntohs(chunk->subh.data_hdr->ssn);
	event->ppid = chunk->subh.data_hdr->ppid;
	if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
		event->flags |= SCTP_UNORDERED;
		event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
	}
	event->tsn = ntohl(chunk->subh.data_hdr->tsn);
	event->msg_flags |= chunk->chunk_hdr->flags;
	event->iif = sctp_chunk_iif(chunk);

fail:
	return event;
}

/* Create a partial delivery related event.
 *
 * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
 *
 *   When a receiver is engaged in a partial delivery of a
 *   message this notification will be used to indicate
 *   various events.
 */
struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
	const struct sctp_association *asoc, __u32 indication,
	gfp_t gfp)
{
	struct sctp_ulpevent *event;
	struct sctp_pdapi_event *pd;
	struct sk_buff *skb;

	event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
				  MSG_NOTIFICATION, gfp);
	if (!event)
		goto fail;

	skb = sctp_event2skb(event);
	pd = (struct sctp_pdapi_event *)
		skb_put(skb, sizeof(struct sctp_pdapi_event));

	/* pdapi_type
	 *   It should be SCTP_PARTIAL_DELIVERY_EVENT
	 *
	 * pdapi_flags: 16 bits (unsigned integer)
	 *   Currently unused.
	 */
	pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
	pd->pdapi_flags = 0;

	/* pdapi_length: 32 bits (unsigned integer)
	 *
	 * This field is the total length of the notification data, including
	 * the notification header.  It will generally be sizeof (struct
	 * sctp_pdapi_event).
	 */
	pd->pdapi_length = sizeof(struct sctp_pdapi_event);

        /*  pdapi_indication: 32 bits (unsigned integer)
	 *
	 * This field holds the indication being sent to the application.
	 */
	pd->pdapi_indication = indication;

	/*  pdapi_assoc_id: sizeof (sctp_assoc_t)
	 *
	 * The association id field, holds the identifier for the association.
	 */
	sctp_ulpevent_set_owner(event, asoc);
	pd->pdapi_assoc_id = sctp_assoc2id(asoc);

	return event;
fail:
	return NULL;
}

/* Return the notification type, assuming this is a notification
 * event.
 */
__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
{
	union sctp_notification *notification;
	struct sk_buff *skb;

	skb = sctp_event2skb((struct sctp_ulpevent *)event);
	notification = (union sctp_notification *) skb->data;
	return notification->sn_header.sn_type;
}

/* Copy out the sndrcvinfo into a msghdr.  */
void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
				   struct msghdr *msghdr)
{
	struct sctp_sndrcvinfo sinfo;

	if (sctp_ulpevent_is_notification(event))
		return;

	/* Sockets API Extensions for SCTP
 	 * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
 	 *
 	 * sinfo_stream: 16 bits (unsigned integer)
 	 *
 	 * For recvmsg() the SCTP stack places the message's stream number in
 	 * this value.
 	*/
	sinfo.sinfo_stream = event->stream;
	/* sinfo_ssn: 16 bits (unsigned integer)
	 *
	 * For recvmsg() this value contains the stream sequence number that
	 * the remote endpoint placed in the DATA chunk.  For fragmented
	 * messages this is the same number for all deliveries of the message
	 * (if more than one recvmsg() is needed to read the message).
	 */
	sinfo.sinfo_ssn = event->ssn;
	/* sinfo_ppid: 32 bits (unsigned integer)
	 *
	 * In recvmsg() this value is
	 * the same information that was passed by the upper layer in the peer
	 * application.  Please note that byte order issues are NOT accounted
	 * for and this information is passed opaquely by the SCTP stack from
	 * one end to the other.
	 */
	sinfo.sinfo_ppid = event->ppid;
	/* sinfo_flags: 16 bits (unsigned integer)
	 *
	 * This field may contain any of the following flags and is composed of
	 * a bitwise OR of these values.
	 *
	 * recvmsg() flags:
	 *
	 * SCTP_UNORDERED - This flag is present when the message was sent
	 *                 non-ordered.
	 */
	sinfo.sinfo_flags = event->flags;
	/* sinfo_tsn: 32 bit (unsigned integer)
	 *
	 * For the receiving side, this field holds a TSN that was 
	 * assigned to one of the SCTP Data Chunks.
	 */
	sinfo.sinfo_tsn = event->tsn;
	/* sinfo_cumtsn: 32 bit (unsigned integer)
	 *
	 * This field will hold the current cumulative TSN as
	 * known by the underlying SCTP layer.  Note this field is
	 * ignored when sending and only valid for a receive
	 * operation when sinfo_flags are set to SCTP_UNORDERED.
	 */
	sinfo.sinfo_cumtsn = event->cumtsn;
	/* sinfo_assoc_id: sizeof (sctp_assoc_t)
	 *
	 * The association handle field, sinfo_assoc_id, holds the identifier
	 * for the association announced in the COMMUNICATION_UP notification.
	 * All notifications for a given association have the same identifier.
	 * Ignored for one-to-one style sockets.
	 */
	sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);

	/* These fields are not used while receiving. */
	sinfo.sinfo_context = 0;
	sinfo.sinfo_timetolive = 0;

	put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
		 sizeof(struct sctp_sndrcvinfo), (void *)&sinfo);
}

/* Do accounting for bytes received and hold a reference to the association
 * for each skb.
 */
static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
				       struct sctp_association *asoc)
{
	struct sk_buff *skb, *frag;

	skb = sctp_event2skb(event);
	/* Set the owner and charge rwnd for bytes received.  */
	sctp_ulpevent_set_owner(event, asoc);
	sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));

	if (!skb->data_len)
		return;

	/* Note:  Not clearing the entire event struct as this is just a
	 * fragment of the real event.  However, we still need to do rwnd
	 * accounting.
	 * In general, the skb passed from IP can have only 1 level of
	 * fragments. But we allow multiple levels of fragments. 
	 */
	for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
		sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
	}
}

/* Do accounting for bytes just read by user and release the references to
 * the association.
 */ 
static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
{
	struct sk_buff *skb, *frag;
	unsigned int	len;

	/* Current stack structures assume that the rcv buffer is
	 * per socket.   For UDP style sockets this is not true as
	 * multiple associations may be on a single UDP-style socket.
	 * Use the local private area of the skb to track the owning
	 * association.
	 */

	skb = sctp_event2skb(event);
	len = skb->len;

	if (!skb->data_len)
		goto done;

	/* Don't forget the fragments. */
	for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
		/* NOTE:  skb_shinfos are recursive. Although IP returns
		 * skb's with only 1 level of fragments, SCTP reassembly can
		 * increase the levels.
		 */
		sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
	}

done:
	sctp_assoc_rwnd_increase(event->asoc, len);
	sctp_ulpevent_release_owner(event);
}

static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
{
	struct sk_buff *skb, *frag;

	skb = sctp_event2skb(event);

	if (!skb->data_len)
		goto done;

	/* Don't forget the fragments. */
	for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
		/* NOTE:  skb_shinfos are recursive. Although IP returns
		 * skb's with only 1 level of fragments, SCTP reassembly can
		 * increase the levels.
		 */
		sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
	}

done:
	sctp_ulpevent_release_owner(event);
}

/* Free a ulpevent that has an owner.  It includes releasing the reference
 * to the owner, updating the rwnd in case of a DATA event and freeing the
 * skb.
 */
void sctp_ulpevent_free(struct sctp_ulpevent *event)
{
	if (sctp_ulpevent_is_notification(event))
		sctp_ulpevent_release_owner(event);
	else
		sctp_ulpevent_release_data(event);

	kfree_skb(sctp_event2skb(event));
}

/* Purge the skb lists holding ulpevents. */
void sctp_queue_purge_ulpevents(struct sk_buff_head *list)
{
	struct sk_buff *skb;
	while ((skb = skb_dequeue(list)) != NULL)
		sctp_ulpevent_free(sctp_skb2event(skb));
}