/
structs.h
2036 lines (1722 loc) · 64.2 KB
/
structs.h
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
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* SCTP kernel implementation
* (C) Copyright IBM Corp. 2001, 2004
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001 Intel Corp.
*
* This file is part of the SCTP kernel implementation
*
* This SCTP 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.
*
* This SCTP 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 addresses:
* 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:
* Randall Stewart <randall@sctp.chicago.il.us>
* Ken Morneau <kmorneau@cisco.com>
* Qiaobing Xie <qxie1@email.mot.com>
* La Monte H.P. Yarroll <piggy@acm.org>
* Karl Knutson <karl@athena.chicago.il.us>
* Jon Grimm <jgrimm@us.ibm.com>
* Xingang Guo <xingang.guo@intel.com>
* Hui Huang <hui.huang@nokia.com>
* Sridhar Samudrala <sri@us.ibm.com>
* Daisy Chang <daisyc@us.ibm.com>
* Dajiang Zhang <dajiang.zhang@nokia.com>
* Ardelle Fan <ardelle.fan@intel.com>
* Ryan Layer <rmlayer@us.ibm.com>
* Anup Pemmaiah <pemmaiah@cc.usu.edu>
* Kevin Gao <kevin.gao@intel.com>
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
*/
#ifndef __sctp_structs_h__
#define __sctp_structs_h__
#include <linux/time.h> /* We get struct timespec. */
#include <linux/socket.h> /* linux/in.h needs this!! */
#include <linux/in.h> /* We get struct sockaddr_in. */
#include <linux/in6.h> /* We get struct in6_addr */
#include <linux/ipv6.h>
#include <asm/param.h> /* We get MAXHOSTNAMELEN. */
#include <linux/atomic.h> /* This gets us atomic counters. */
#include <linux/skbuff.h> /* We need sk_buff_head. */
#include <linux/workqueue.h> /* We need tq_struct. */
#include <linux/sctp.h> /* We need sctp* header structs. */
#include <net/sctp/auth.h> /* We need auth specific structs */
/* A convenience structure for handling sockaddr structures.
* We should wean ourselves off this.
*/
union sctp_addr {
struct sockaddr_in v4;
struct sockaddr_in6 v6;
struct sockaddr sa;
};
/* Forward declarations for data structures. */
struct sctp_globals;
struct sctp_endpoint;
struct sctp_association;
struct sctp_transport;
struct sctp_packet;
struct sctp_chunk;
struct sctp_inq;
struct sctp_outq;
struct sctp_bind_addr;
struct sctp_ulpq;
struct sctp_ep_common;
struct sctp_ssnmap;
struct crypto_hash;
#include <net/sctp/tsnmap.h>
#include <net/sctp/ulpevent.h>
#include <net/sctp/ulpqueue.h>
/* Structures useful for managing bind/connect. */
struct sctp_bind_bucket {
unsigned short port;
unsigned short fastreuse;
struct hlist_node node;
struct hlist_head owner;
};
struct sctp_bind_hashbucket {
spinlock_t lock;
struct hlist_head chain;
};
/* Used for hashing all associations. */
struct sctp_hashbucket {
rwlock_t lock;
struct hlist_head chain;
} __attribute__((__aligned__(8)));
/* The SCTP globals structure. */
extern struct sctp_globals {
/* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values
*
* The following protocol parameters are RECOMMENDED:
*
* RTO.Initial - 3 seconds
* RTO.Min - 1 second
* RTO.Max - 60 seconds
* RTO.Alpha - 1/8 (3 when converted to right shifts.)
* RTO.Beta - 1/4 (2 when converted to right shifts.)
*/
unsigned int rto_initial;
unsigned int rto_min;
unsigned int rto_max;
/* Note: rto_alpha and rto_beta are really defined as inverse
* powers of two to facilitate integer operations.
*/
int rto_alpha;
int rto_beta;
/* Max.Burst - 4 */
int max_burst;
/* Whether Cookie Preservative is enabled(1) or not(0) */
int cookie_preserve_enable;
/* Valid.Cookie.Life - 60 seconds */
unsigned int valid_cookie_life;
/* Delayed SACK timeout 200ms default*/
unsigned int sack_timeout;
/* HB.interval - 30 seconds */
unsigned int hb_interval;
/* Association.Max.Retrans - 10 attempts
* Path.Max.Retrans - 5 attempts (per destination address)
* Max.Init.Retransmits - 8 attempts
*/
int max_retrans_association;
int max_retrans_path;
int max_retrans_init;
/*
* Policy for preforming sctp/socket accounting
* 0 - do socket level accounting, all assocs share sk_sndbuf
* 1 - do sctp accounting, each asoc may use sk_sndbuf bytes
*/
int sndbuf_policy;
/*
* Policy for preforming sctp/socket accounting
* 0 - do socket level accounting, all assocs share sk_rcvbuf
* 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes
*/
int rcvbuf_policy;
/* The following variables are implementation specific. */
/* Default initialization values to be applied to new associations. */
__u16 max_instreams;
__u16 max_outstreams;
/* This is a list of groups of functions for each address
* family that we support.
*/
struct list_head address_families;
/* This is the hash of all endpoints. */
int ep_hashsize;
struct sctp_hashbucket *ep_hashtable;
/* This is the hash of all associations. */
int assoc_hashsize;
struct sctp_hashbucket *assoc_hashtable;
/* This is the sctp port control hash. */
int port_hashsize;
struct sctp_bind_hashbucket *port_hashtable;
/* This is the global local address list.
* We actively maintain this complete list of addresses on
* the system by catching address add/delete events.
*
* It is a list of sctp_sockaddr_entry.
*/
struct list_head local_addr_list;
int default_auto_asconf;
struct list_head addr_waitq;
struct timer_list addr_wq_timer;
struct list_head auto_asconf_splist;
spinlock_t addr_wq_lock;
/* Lock that protects the local_addr_list writers */
spinlock_t addr_list_lock;
/* Flag to indicate if addip is enabled. */
int addip_enable;
int addip_noauth_enable;
/* Flag to indicate if PR-SCTP is enabled. */
int prsctp_enable;
/* Flag to idicate if SCTP-AUTH is enabled */
int auth_enable;
/*
* Policy to control SCTP IPv4 address scoping
* 0 - Disable IPv4 address scoping
* 1 - Enable IPv4 address scoping
* 2 - Selectively allow only IPv4 private addresses
* 3 - Selectively allow only IPv4 link local address
*/
int ipv4_scope_policy;
/* Flag to indicate whether computing and verifying checksum
* is disabled. */
int checksum_disable;
/* Threshold for rwnd update SACKS. Receive buffer shifted this many
* bits is an indicator of when to send and window update SACK.
*/
int rwnd_update_shift;
/* Threshold for autoclose timeout, in seconds. */
unsigned long max_autoclose;
} sctp_globals;
#define sctp_rto_initial (sctp_globals.rto_initial)
#define sctp_rto_min (sctp_globals.rto_min)
#define sctp_rto_max (sctp_globals.rto_max)
#define sctp_rto_alpha (sctp_globals.rto_alpha)
#define sctp_rto_beta (sctp_globals.rto_beta)
#define sctp_max_burst (sctp_globals.max_burst)
#define sctp_valid_cookie_life (sctp_globals.valid_cookie_life)
#define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable)
#define sctp_max_retrans_association (sctp_globals.max_retrans_association)
#define sctp_sndbuf_policy (sctp_globals.sndbuf_policy)
#define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy)
#define sctp_max_retrans_path (sctp_globals.max_retrans_path)
#define sctp_max_retrans_init (sctp_globals.max_retrans_init)
#define sctp_sack_timeout (sctp_globals.sack_timeout)
#define sctp_hb_interval (sctp_globals.hb_interval)
#define sctp_max_instreams (sctp_globals.max_instreams)
#define sctp_max_outstreams (sctp_globals.max_outstreams)
#define sctp_address_families (sctp_globals.address_families)
#define sctp_ep_hashsize (sctp_globals.ep_hashsize)
#define sctp_ep_hashtable (sctp_globals.ep_hashtable)
#define sctp_assoc_hashsize (sctp_globals.assoc_hashsize)
#define sctp_assoc_hashtable (sctp_globals.assoc_hashtable)
#define sctp_port_hashsize (sctp_globals.port_hashsize)
#define sctp_port_hashtable (sctp_globals.port_hashtable)
#define sctp_local_addr_list (sctp_globals.local_addr_list)
#define sctp_local_addr_lock (sctp_globals.addr_list_lock)
#define sctp_auto_asconf_splist (sctp_globals.auto_asconf_splist)
#define sctp_addr_waitq (sctp_globals.addr_waitq)
#define sctp_addr_wq_timer (sctp_globals.addr_wq_timer)
#define sctp_addr_wq_lock (sctp_globals.addr_wq_lock)
#define sctp_default_auto_asconf (sctp_globals.default_auto_asconf)
#define sctp_scope_policy (sctp_globals.ipv4_scope_policy)
#define sctp_addip_enable (sctp_globals.addip_enable)
#define sctp_addip_noauth (sctp_globals.addip_noauth_enable)
#define sctp_prsctp_enable (sctp_globals.prsctp_enable)
#define sctp_auth_enable (sctp_globals.auth_enable)
#define sctp_checksum_disable (sctp_globals.checksum_disable)
#define sctp_rwnd_upd_shift (sctp_globals.rwnd_update_shift)
#define sctp_max_autoclose (sctp_globals.max_autoclose)
/* SCTP Socket type: UDP or TCP style. */
typedef enum {
SCTP_SOCKET_UDP = 0,
SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
SCTP_SOCKET_TCP
} sctp_socket_type_t;
/* Per socket SCTP information. */
struct sctp_sock {
/* inet_sock has to be the first member of sctp_sock */
struct inet_sock inet;
/* What kind of a socket is this? */
sctp_socket_type_t type;
/* PF_ family specific functions. */
struct sctp_pf *pf;
/* Access to HMAC transform. */
struct crypto_hash *hmac;
/* What is our base endpointer? */
struct sctp_endpoint *ep;
struct sctp_bind_bucket *bind_hash;
/* Various Socket Options. */
__u16 default_stream;
__u32 default_ppid;
__u16 default_flags;
__u32 default_context;
__u32 default_timetolive;
__u32 default_rcv_context;
int max_burst;
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
* the destination address every heartbeat interval. This value
* will be inherited by all new associations.
*/
__u32 hbinterval;
/* This is the max_retrans value for new associations. */
__u16 pathmaxrxt;
/* The initial Path MTU to use for new associations. */
__u32 pathmtu;
/* The default SACK delay timeout for new associations. */
__u32 sackdelay;
__u32 sackfreq;
/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
__u32 param_flags;
struct sctp_initmsg initmsg;
struct sctp_rtoinfo rtoinfo;
struct sctp_paddrparams paddrparam;
struct sctp_event_subscribe subscribe;
struct sctp_assocparams assocparams;
int user_frag;
__u32 autoclose;
__u8 nodelay;
__u8 disable_fragments;
__u8 v4mapped;
__u8 frag_interleave;
__u32 adaptation_ind;
__u32 pd_point;
atomic_t pd_mode;
/* Receive to here while partial delivery is in effect. */
struct sk_buff_head pd_lobby;
struct list_head auto_asconf_list;
int do_auto_asconf;
};
static inline struct sctp_sock *sctp_sk(const struct sock *sk)
{
return (struct sctp_sock *)sk;
}
static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
{
return (struct sock *)sp;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
struct sctp6_sock {
struct sctp_sock sctp;
struct ipv6_pinfo inet6;
};
#endif /* CONFIG_IPV6 */
/* This is our APPLICATION-SPECIFIC state cookie.
* THIS IS NOT DICTATED BY THE SPECIFICATION.
*/
/* These are the parts of an association which we send in the cookie.
* Most of these are straight out of:
* RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
*
*/
struct sctp_cookie {
/* My : Tag expected in every inbound packet and sent
* Verification: in the INIT or INIT ACK chunk.
* Tag :
*/
__u32 my_vtag;
/* Peer's : Tag expected in every outbound packet except
* Verification: in the INIT chunk.
* Tag :
*/
__u32 peer_vtag;
/* The rest of these are not from the spec, but really need to
* be in the cookie.
*/
/* My Tie Tag : Assist in discovering a restarting association. */
__u32 my_ttag;
/* Peer's Tie Tag: Assist in discovering a restarting association. */
__u32 peer_ttag;
/* When does this cookie expire? */
struct timeval expiration;
/* Number of inbound/outbound streams which are set
* and negotiated during the INIT process.
*/
__u16 sinit_num_ostreams;
__u16 sinit_max_instreams;
/* This is the first sequence number I used. */
__u32 initial_tsn;
/* This holds the originating address of the INIT packet. */
union sctp_addr peer_addr;
/* IG Section 2.35.3
* Include the source port of the INIT-ACK
*/
__u16 my_port;
__u8 prsctp_capable;
/* Padding for future use */
__u8 padding;
__u32 adaptation_ind;
__u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH];
__u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
__u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS];
/* This is a shim for my peer's INIT packet, followed by
* a copy of the raw address list of the association.
* The length of the raw address list is saved in the
* raw_addr_list_len field, which will be used at the time when
* the association TCB is re-constructed from the cookie.
*/
__u32 raw_addr_list_len;
struct sctp_init_chunk peer_init[0];
};
/* The format of our cookie that we send to our peer. */
struct sctp_signed_cookie {
__u8 signature[SCTP_SECRET_SIZE];
__u32 __pad; /* force sctp_cookie alignment to 64 bits */
struct sctp_cookie c;
} __packed;
/* This is another convenience type to allocate memory for address
* params for the maximum size and pass such structures around
* internally.
*/
union sctp_addr_param {
struct sctp_paramhdr p;
struct sctp_ipv4addr_param v4;
struct sctp_ipv6addr_param v6;
};
/* A convenience type to allow walking through the various
* parameters and avoid casting all over the place.
*/
union sctp_params {
void *v;
struct sctp_paramhdr *p;
struct sctp_cookie_preserve_param *life;
struct sctp_hostname_param *dns;
struct sctp_cookie_param *cookie;
struct sctp_supported_addrs_param *sat;
struct sctp_ipv4addr_param *v4;
struct sctp_ipv6addr_param *v6;
union sctp_addr_param *addr;
struct sctp_adaptation_ind_param *aind;
struct sctp_supported_ext_param *ext;
struct sctp_random_param *random;
struct sctp_chunks_param *chunks;
struct sctp_hmac_algo_param *hmac_algo;
struct sctp_addip_param *addip;
};
/* RFC 2960. Section 3.3.5 Heartbeat.
* Heartbeat Information: variable length
* The Sender-specific Heartbeat Info field should normally include
* information about the sender's current time when this HEARTBEAT
* chunk is sent and the destination transport address to which this
* HEARTBEAT is sent (see Section 8.3).
*/
typedef struct sctp_sender_hb_info {
struct sctp_paramhdr param_hdr;
union sctp_addr daddr;
unsigned long sent_at;
__u64 hb_nonce;
} __packed sctp_sender_hb_info_t;
/*
* RFC 2960 1.3.2 Sequenced Delivery within Streams
*
* The term "stream" is used in SCTP to refer to a sequence of user
* messages that are to be delivered to the upper-layer protocol in
* order with respect to other messages within the same stream. This is
* in contrast to its usage in TCP, where it refers to a sequence of
* bytes (in this document a byte is assumed to be eight bits).
* ...
*
* This is the structure we use to track both our outbound and inbound
* SSN, or Stream Sequence Numbers.
*/
struct sctp_stream {
__u16 *ssn;
unsigned int len;
};
struct sctp_ssnmap {
struct sctp_stream in;
struct sctp_stream out;
int malloced;
};
struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
gfp_t gfp);
void sctp_ssnmap_free(struct sctp_ssnmap *map);
void sctp_ssnmap_clear(struct sctp_ssnmap *map);
/* What is the current SSN number for this stream? */
static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id)
{
return stream->ssn[id];
}
/* Return the next SSN number for this stream. */
static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id)
{
return stream->ssn[id]++;
}
/* Skip over this ssn and all below. */
static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id,
__u16 ssn)
{
stream->ssn[id] = ssn+1;
}
/*
* Pointers to address related SCTP functions.
* (i.e. things that depend on the address family.)
*/
struct sctp_af {
int (*sctp_xmit) (struct sk_buff *skb,
struct sctp_transport *);
int (*setsockopt) (struct sock *sk,
int level,
int optname,
char __user *optval,
unsigned int optlen);
int (*getsockopt) (struct sock *sk,
int level,
int optname,
char __user *optval,
int __user *optlen);
int (*compat_setsockopt) (struct sock *sk,
int level,
int optname,
char __user *optval,
unsigned int optlen);
int (*compat_getsockopt) (struct sock *sk,
int level,
int optname,
char __user *optval,
int __user *optlen);
void (*get_dst) (struct sctp_transport *t,
union sctp_addr *saddr,
struct flowi *fl,
struct sock *sk);
void (*get_saddr) (struct sctp_sock *sk,
struct sctp_transport *t,
struct flowi *fl);
void (*copy_addrlist) (struct list_head *,
struct net_device *);
int (*cmp_addr) (const union sctp_addr *addr1,
const union sctp_addr *addr2);
void (*addr_copy) (union sctp_addr *dst,
union sctp_addr *src);
void (*from_skb) (union sctp_addr *,
struct sk_buff *skb,
int saddr);
void (*from_sk) (union sctp_addr *,
struct sock *sk);
void (*to_sk_saddr) (union sctp_addr *,
struct sock *sk);
void (*to_sk_daddr) (union sctp_addr *,
struct sock *sk);
void (*from_addr_param) (union sctp_addr *,
union sctp_addr_param *,
__be16 port, int iif);
int (*to_addr_param) (const union sctp_addr *,
union sctp_addr_param *);
int (*addr_valid) (union sctp_addr *,
struct sctp_sock *,
const struct sk_buff *);
sctp_scope_t (*scope) (union sctp_addr *);
void (*inaddr_any) (union sctp_addr *, __be16);
int (*is_any) (const union sctp_addr *);
int (*available) (union sctp_addr *,
struct sctp_sock *);
int (*skb_iif) (const struct sk_buff *sk);
int (*is_ce) (const struct sk_buff *sk);
void (*seq_dump_addr)(struct seq_file *seq,
union sctp_addr *addr);
void (*ecn_capable)(struct sock *sk);
__u16 net_header_len;
int sockaddr_len;
sa_family_t sa_family;
struct list_head list;
};
struct sctp_af *sctp_get_af_specific(sa_family_t);
int sctp_register_af(struct sctp_af *);
/* Protocol family functions. */
struct sctp_pf {
void (*event_msgname)(struct sctp_ulpevent *, char *, int *);
void (*skb_msgname) (struct sk_buff *, char *, int *);
int (*af_supported) (sa_family_t, struct sctp_sock *);
int (*cmp_addr) (const union sctp_addr *,
const union sctp_addr *,
struct sctp_sock *);
int (*bind_verify) (struct sctp_sock *, union sctp_addr *);
int (*send_verify) (struct sctp_sock *, union sctp_addr *);
int (*supported_addrs)(const struct sctp_sock *, __be16 *);
struct sock *(*create_accept_sk) (struct sock *sk,
struct sctp_association *asoc);
void (*addr_v4map) (struct sctp_sock *, union sctp_addr *);
struct sctp_af *af;
};
/* Structure to track chunk fragments that have been acked, but peer
* fragments of the same message have not.
*/
struct sctp_datamsg {
/* Chunks waiting to be submitted to lower layer. */
struct list_head chunks;
/* Reference counting. */
atomic_t refcnt;
/* When is this message no longer interesting to the peer? */
unsigned long expires_at;
/* Did the messenge fail to send? */
int send_error;
u8 send_failed:1,
can_abandon:1, /* can chunks from this message can be abandoned. */
can_delay; /* should this message be Nagle delayed */
};
struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
struct sctp_sndrcvinfo *,
struct msghdr *, int len);
void sctp_datamsg_free(struct sctp_datamsg *);
void sctp_datamsg_put(struct sctp_datamsg *);
void sctp_chunk_fail(struct sctp_chunk *, int error);
int sctp_chunk_abandoned(struct sctp_chunk *);
/* RFC2960 1.4 Key Terms
*
* o Chunk: A unit of information within an SCTP packet, consisting of
* a chunk header and chunk-specific content.
*
* As a matter of convenience, we remember the SCTP common header for
* each chunk as well as a few other header pointers...
*/
struct sctp_chunk {
struct list_head list;
atomic_t refcnt;
/* This is our link to the per-transport transmitted list. */
struct list_head transmitted_list;
/* This field is used by chunks that hold fragmented data.
* For the first fragment this is the list that holds the rest of
* fragments. For the remaining fragments, this is the link to the
* frag_list maintained in the first fragment.
*/
struct list_head frag_list;
/* This points to the sk_buff containing the actual data. */
struct sk_buff *skb;
/* These are the SCTP headers by reverse order in a packet.
* Note that some of these may happen more than once. In that
* case, we point at the "current" one, whatever that means
* for that level of header.
*/
/* We point this at the FIRST TLV parameter to chunk_hdr. */
union sctp_params param_hdr;
union {
__u8 *v;
struct sctp_datahdr *data_hdr;
struct sctp_inithdr *init_hdr;
struct sctp_sackhdr *sack_hdr;
struct sctp_heartbeathdr *hb_hdr;
struct sctp_sender_hb_info *hbs_hdr;
struct sctp_shutdownhdr *shutdown_hdr;
struct sctp_signed_cookie *cookie_hdr;
struct sctp_ecnehdr *ecne_hdr;
struct sctp_cwrhdr *ecn_cwr_hdr;
struct sctp_errhdr *err_hdr;
struct sctp_addiphdr *addip_hdr;
struct sctp_fwdtsn_hdr *fwdtsn_hdr;
struct sctp_authhdr *auth_hdr;
} subh;
__u8 *chunk_end;
struct sctp_chunkhdr *chunk_hdr;
struct sctphdr *sctp_hdr;
/* This needs to be recoverable for SCTP_SEND_FAILED events. */
struct sctp_sndrcvinfo sinfo;
/* Which association does this belong to? */
struct sctp_association *asoc;
/* What endpoint received this chunk? */
struct sctp_ep_common *rcvr;
/* We fill this in if we are calculating RTT. */
unsigned long sent_at;
/* What is the origin IP address for this chunk? */
union sctp_addr source;
/* Destination address for this chunk. */
union sctp_addr dest;
/* For outbound message, track all fragments for SEND_FAILED. */
struct sctp_datamsg *msg;
/* For an inbound chunk, this tells us where it came from.
* For an outbound chunk, it tells us where we'd like it to
* go. It is NULL if we have no preference.
*/
struct sctp_transport *transport;
/* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO
* we need save a pointer to the AUTH chunk, since the SCTP-AUTH
* spec violates the principle premis that all chunks are processed
* in order.
*/
struct sk_buff *auth_chunk;
#define SCTP_CAN_FRTX 0x0
#define SCTP_NEED_FRTX 0x1
#define SCTP_DONT_FRTX 0x2
__u16 rtt_in_progress:1, /* This chunk used for RTT calc? */
has_tsn:1, /* Does this chunk have a TSN yet? */
has_ssn:1, /* Does this chunk have a SSN yet? */
singleton:1, /* Only chunk in the packet? */
end_of_packet:1, /* Last chunk in the packet? */
ecn_ce_done:1, /* Have we processed the ECN CE bit? */
pdiscard:1, /* Discard the whole packet now? */
tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */
data_accepted:1, /* At least 1 chunk accepted */
auth:1, /* IN: was auth'ed | OUT: needs auth */
has_asconf:1, /* IN: have seen an asconf before */
tsn_missing_report:2, /* Data chunk missing counter. */
fast_retransmit:2; /* Is this chunk fast retransmitted? */
};
void sctp_chunk_hold(struct sctp_chunk *);
void sctp_chunk_put(struct sctp_chunk *);
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
struct iovec *data);
void sctp_chunk_free(struct sctp_chunk *);
void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, const void *data);
struct sctp_chunk *sctp_chunkify(struct sk_buff *,
const struct sctp_association *,
struct sock *);
void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *,
union sctp_addr *);
const union sctp_addr *sctp_source(const struct sctp_chunk *chunk);
enum {
SCTP_ADDR_NEW, /* new address added to assoc/ep */
SCTP_ADDR_SRC, /* address can be used as source */
SCTP_ADDR_DEL, /* address about to be deleted */
};
/* This is a structure for holding either an IPv6 or an IPv4 address. */
struct sctp_sockaddr_entry {
struct list_head list;
struct rcu_head rcu;
union sctp_addr a;
__u8 state;
__u8 valid;
};
#define SCTP_ADDRESS_TICK_DELAY 500
typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *);
/* This structure holds lists of chunks as we are assembling for
* transmission.
*/
struct sctp_packet {
/* These are the SCTP header values (host order) for the packet. */
__u16 source_port;
__u16 destination_port;
__u32 vtag;
/* This contains the payload chunks. */
struct list_head chunk_list;
/* This is the overhead of the sctp and ip headers. */
size_t overhead;
/* This is the total size of all chunks INCLUDING padding. */
size_t size;
/* The packet is destined for this transport address.
* The function we finally use to pass down to the next lower
* layer lives in the transport structure.
*/
struct sctp_transport *transport;
/* pointer to the auth chunk for this packet */
struct sctp_chunk *auth;
u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */
has_sack:1, /* This packet contains a SACK chunk. */
has_auth:1, /* This packet contains an AUTH chunk */
has_data:1, /* This packet contains at least 1 DATA chunk */
ipfragok:1, /* So let ip fragment this packet */
malloced:1; /* Is it malloced? */
};
struct sctp_packet *sctp_packet_init(struct sctp_packet *,
struct sctp_transport *,
__u16 sport, __u16 dport);
struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int);
sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *,
struct sctp_chunk *, int);
sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *,
struct sctp_chunk *);
int sctp_packet_transmit(struct sctp_packet *);
void sctp_packet_free(struct sctp_packet *);
static inline int sctp_packet_empty(struct sctp_packet *packet)
{
return packet->size == packet->overhead;
}
/* This represents a remote transport address.
* For local transport addresses, we just use union sctp_addr.
*
* RFC2960 Section 1.4 Key Terms
*
* o Transport address: A Transport Address is traditionally defined
* by Network Layer address, Transport Layer protocol and Transport
* Layer port number. In the case of SCTP running over IP, a
* transport address is defined by the combination of an IP address
* and an SCTP port number (where SCTP is the Transport protocol).
*
* RFC2960 Section 7.1 SCTP Differences from TCP Congestion control
*
* o The sender keeps a separate congestion control parameter set for
* each of the destination addresses it can send to (not each
* source-destination pair but for each destination). The parameters
* should decay if the address is not used for a long enough time
* period.
*
*/
struct sctp_transport {
/* A list of transports. */
struct list_head transports;
/* Reference counting. */
atomic_t refcnt;
__u32 dead:1,
/* RTO-Pending : A flag used to track if one of the DATA
* chunks sent to this address is currently being
* used to compute a RTT. If this flag is 0,
* the next DATA chunk sent to this destination
* should be used to compute a RTT and this flag
* should be set. Every time the RTT
* calculation completes (i.e. the DATA chunk
* is SACK'd) clear this flag.
*/
rto_pending:1,
/*
* hb_sent : a flag that signals that we have a pending
* heartbeat.
*/
hb_sent:1,
/* Is the Path MTU update pending on this tranport */
pmtu_pending:1,
/* Is this structure kfree()able? */
malloced:1;
struct flowi fl;
/* This is the peer's IP address and port. */
union sctp_addr ipaddr;
/* These are the functions we call to handle LLP stuff. */
struct sctp_af *af_specific;
/* Which association do we belong to? */
struct sctp_association *asoc;
/* RFC2960
*
* 12.3 Per Transport Address Data
*
* For each destination transport address in the peer's
* address list derived from the INIT or INIT ACK chunk, a
* number of data elements needs to be maintained including:
*/
/* RTO : The current retransmission timeout value. */
unsigned long rto;
__u32 rtt; /* This is the most recent RTT. */
/* RTTVAR : The current RTT variation. */
__u32 rttvar;
/* SRTT : The current smoothed round trip time. */
__u32 srtt;
/*
* These are the congestion stats.
*/
/* cwnd : The current congestion window. */
__u32 cwnd; /* This is the actual cwnd. */
/* ssthresh : The current slow start threshold value. */
__u32 ssthresh;
/* partial : The tracking method for increase of cwnd when in
* bytes acked : congestion avoidance mode (see Section 6.2.2)
*/
__u32 partial_bytes_acked;
/* Data that has been sent, but not acknowledged. */
__u32 flight_size;
__u32 burst_limited; /* Holds old cwnd when max.burst is applied */
/* Destination */
struct dst_entry *dst;
/* Source address. */
union sctp_addr saddr;
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
* the destination address every heartbeat interval.
*/
unsigned long hbinterval;
/* SACK delay timeout */
unsigned long sackdelay;
__u32 sackfreq;
/* When was the last time (in jiffies) that we heard from this
* transport? We use this to pick new active and retran paths.
*/
unsigned long last_time_heard;
/* Last time(in jiffies) when cwnd is reduced due to the congestion
* indication based on ECNE chunk.
*/
unsigned long last_time_ecne_reduced;
/* This is the max_retrans value for the transport and will
* be initialized from the assocs value. This can be changed
* using SCTP_SET_PEER_ADDR_PARAMS socket option.
*/
__u16 pathmaxrxt;
/* PMTU : The current known path MTU. */
__u32 pathmtu;
/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
__u32 param_flags;
/* The number of times INIT has been sent on this transport. */