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 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * This SCTP implementation is free software;
10 * you can redistribute it and/or modify it under the terms of
11 * the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
13 * any later version.
14 *
15 * This SCTP implementation is distributed in the hope that it
16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
17 * ************************
18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 * See the GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with GNU CC; see the file COPYING. If not, write to
23 * the Free Software Foundation, 59 Temple Place - Suite 330,
24 * Boston, MA 02111-1307, USA.
25 *
26 * Please send any bug reports or fixes you make to the
27 * email addresses:
28 * lksctp developers <lksctp-developers@lists.sourceforge.net>
29 *
30 * Or submit a bug report through the following website:
31 * http://www.sf.net/projects/lksctp
32 *
33 * Written or modified by:
34 * Randall Stewart <randall@sctp.chicago.il.us>
35 * Ken Morneau <kmorneau@cisco.com>
36 * Qiaobing Xie <qxie1@email.mot.com>
37 * La Monte H.P. Yarroll <piggy@acm.org>
38 * Karl Knutson <karl@athena.chicago.il.us>
39 * Jon Grimm <jgrimm@us.ibm.com>
40 * Xingang Guo <xingang.guo@intel.com>
41 * Hui Huang <hui.huang@nokia.com>
42 * Sridhar Samudrala <sri@us.ibm.com>
43 * Daisy Chang <daisyc@us.ibm.com>
44 * Dajiang Zhang <dajiang.zhang@nokia.com>
45 * Ardelle Fan <ardelle.fan@intel.com>
46 * Ryan Layer <rmlayer@us.ibm.com>
47 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
48 * Kevin Gao <kevin.gao@intel.com>
49 *
50 * Any bugs reported given to us we will try to fix... any fixes shared will
51 * be incorporated into the next SCTP release.
52 */
53
54 #ifndef __sctp_structs_h__
55 #define __sctp_structs_h__
56
57 #include <linux/time.h> /* We get struct timespec. */
58 #include <linux/socket.h> /* linux/in.h needs this!! */
59 #include <linux/in.h> /* We get struct sockaddr_in. */
60 #include <linux/in6.h> /* We get struct in6_addr */
61 #include <linux/ipv6.h>
62 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */
63 #include <asm/atomic.h> /* This gets us atomic counters. */
64 #include <linux/skbuff.h> /* We need sk_buff_head. */
65 #include <linux/workqueue.h> /* We need tq_struct. */
66 #include <linux/sctp.h> /* We need sctp* header structs. */
67 #include <net/sctp/auth.h> /* We need auth specific structs */
68
69 /* A convenience structure for handling sockaddr structures.
70 * We should wean ourselves off this.
71 */
72 union sctp_addr {
73 struct sockaddr_in v4;
74 struct sockaddr_in6 v6;
75 struct sockaddr sa;
76 };
77
78 /* Forward declarations for data structures. */
79 struct sctp_globals;
80 struct sctp_endpoint;
81 struct sctp_association;
82 struct sctp_transport;
83 struct sctp_packet;
84 struct sctp_chunk;
85 struct sctp_inq;
86 struct sctp_outq;
87 struct sctp_bind_addr;
88 struct sctp_ulpq;
89 struct sctp_ep_common;
90 struct sctp_ssnmap;
91 struct crypto_hash;
92
93
94 #include <net/sctp/tsnmap.h>
95 #include <net/sctp/ulpevent.h>
96 #include <net/sctp/ulpqueue.h>
97
98 /* Structures useful for managing bind/connect. */
99
100 struct sctp_bind_bucket {
101 unsigned short port;
102 unsigned short fastreuse;
103 struct hlist_node node;
104 struct hlist_head owner;
105 };
106
107 struct sctp_bind_hashbucket {
108 spinlock_t lock;
109 struct hlist_head chain;
110 };
111
112 /* Used for hashing all associations. */
113 struct sctp_hashbucket {
114 rwlock_t lock;
115 struct hlist_head chain;
116 } __attribute__((__aligned__(8)));
117
118
119 /* The SCTP globals structure. */
120 extern struct sctp_globals {
121 /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values
122 *
123 * The following protocol parameters are RECOMMENDED:
124 *
125 * RTO.Initial - 3 seconds
126 * RTO.Min - 1 second
127 * RTO.Max - 60 seconds
128 * RTO.Alpha - 1/8 (3 when converted to right shifts.)
129 * RTO.Beta - 1/4 (2 when converted to right shifts.)
130 */
131 unsigned int rto_initial;
132 unsigned int rto_min;
133 unsigned int rto_max;
134
135 /* Note: rto_alpha and rto_beta are really defined as inverse
136 * powers of two to facilitate integer operations.
137 */
138 int rto_alpha;
139 int rto_beta;
140
141 /* Max.Burst - 4 */
142 int max_burst;
143
144 /* Whether Cookie Preservative is enabled(1) or not(0) */
145 int cookie_preserve_enable;
146
147 /* Valid.Cookie.Life - 60 seconds */
148 unsigned int valid_cookie_life;
149
150 /* Delayed SACK timeout 200ms default*/
151 unsigned int sack_timeout;
152
153 /* HB.interval - 30 seconds */
154 unsigned int hb_interval;
155
156 /* Association.Max.Retrans - 10 attempts
157 * Path.Max.Retrans - 5 attempts (per destination address)
158 * Max.Init.Retransmits - 8 attempts
159 */
160 int max_retrans_association;
161 int max_retrans_path;
162 int max_retrans_init;
163
164 /*
165 * Policy for preforming sctp/socket accounting
166 * 0 - do socket level accounting, all assocs share sk_sndbuf
167 * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes
168 */
169 int sndbuf_policy;
170
171 /*
172 * Policy for preforming sctp/socket accounting
173 * 0 - do socket level accounting, all assocs share sk_rcvbuf
174 * 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes
175 */
176 int rcvbuf_policy;
177
178 /* The following variables are implementation specific. */
179
180 /* Default initialization values to be applied to new associations. */
181 __u16 max_instreams;
182 __u16 max_outstreams;
183
184 /* This is a list of groups of functions for each address
185 * family that we support.
186 */
187 struct list_head address_families;
188
189 /* This is the hash of all endpoints. */
190 int ep_hashsize;
191 struct sctp_hashbucket *ep_hashtable;
192
193 /* This is the hash of all associations. */
194 int assoc_hashsize;
195 struct sctp_hashbucket *assoc_hashtable;
196
197 /* This is the sctp port control hash. */
198 int port_hashsize;
199 struct sctp_bind_hashbucket *port_hashtable;
200
201 /* This is the global local address list.
202 * We actively maintain this complete list of addresses on
203 * the system by catching address add/delete events.
204 *
205 * It is a list of sctp_sockaddr_entry.
206 */
207 struct list_head local_addr_list;
208
209 /* Lock that protects the local_addr_list writers */
210 spinlock_t addr_list_lock;
211
212 /* Flag to indicate if addip is enabled. */
213 int addip_enable;
214 int addip_noauth_enable;
215
216 /* Flag to indicate if PR-SCTP is enabled. */
217 int prsctp_enable;
218
219 /* Flag to idicate if SCTP-AUTH is enabled */
220 int auth_enable;
221
222 /*
223 * Policy to control SCTP IPv4 address scoping
224 * 0 - Disable IPv4 address scoping
225 * 1 - Enable IPv4 address scoping
226 * 2 - Selectively allow only IPv4 private addresses
227 * 3 - Selectively allow only IPv4 link local address
228 */
229 int ipv4_scope_policy;
230
231 /* Flag to indicate whether computing and verifying checksum
232 * is disabled. */
233 int checksum_disable;
234
235 /* Threshold for rwnd update SACKS. Receive buffer shifted this many
236 * bits is an indicator of when to send and window update SACK.
237 */
238 int rwnd_update_shift;
239 } sctp_globals;
240
241 #define sctp_rto_initial (sctp_globals.rto_initial)
242 #define sctp_rto_min (sctp_globals.rto_min)
243 #define sctp_rto_max (sctp_globals.rto_max)
244 #define sctp_rto_alpha (sctp_globals.rto_alpha)
245 #define sctp_rto_beta (sctp_globals.rto_beta)
246 #define sctp_max_burst (sctp_globals.max_burst)
247 #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life)
248 #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable)
249 #define sctp_max_retrans_association (sctp_globals.max_retrans_association)
250 #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy)
251 #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy)
252 #define sctp_max_retrans_path (sctp_globals.max_retrans_path)
253 #define sctp_max_retrans_init (sctp_globals.max_retrans_init)
254 #define sctp_sack_timeout (sctp_globals.sack_timeout)
255 #define sctp_hb_interval (sctp_globals.hb_interval)
256 #define sctp_max_instreams (sctp_globals.max_instreams)
257 #define sctp_max_outstreams (sctp_globals.max_outstreams)
258 #define sctp_address_families (sctp_globals.address_families)
259 #define sctp_ep_hashsize (sctp_globals.ep_hashsize)
260 #define sctp_ep_hashtable (sctp_globals.ep_hashtable)
261 #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize)
262 #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable)
263 #define sctp_port_hashsize (sctp_globals.port_hashsize)
264 #define sctp_port_hashtable (sctp_globals.port_hashtable)
265 #define sctp_local_addr_list (sctp_globals.local_addr_list)
266 #define sctp_local_addr_lock (sctp_globals.addr_list_lock)
267 #define sctp_scope_policy (sctp_globals.ipv4_scope_policy)
268 #define sctp_addip_enable (sctp_globals.addip_enable)
269 #define sctp_addip_noauth (sctp_globals.addip_noauth_enable)
270 #define sctp_prsctp_enable (sctp_globals.prsctp_enable)
271 #define sctp_auth_enable (sctp_globals.auth_enable)
272 #define sctp_checksum_disable (sctp_globals.checksum_disable)
273 #define sctp_rwnd_upd_shift (sctp_globals.rwnd_update_shift)
274
275 /* SCTP Socket type: UDP or TCP style. */
276 typedef enum {
277 SCTP_SOCKET_UDP = 0,
278 SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
279 SCTP_SOCKET_TCP
280 } sctp_socket_type_t;
281
282 /* Per socket SCTP information. */
283 struct sctp_sock {
284 /* inet_sock has to be the first member of sctp_sock */
285 struct inet_sock inet;
286 /* What kind of a socket is this? */
287 sctp_socket_type_t type;
288
289 /* PF_ family specific functions. */
290 struct sctp_pf *pf;
291
292 /* Access to HMAC transform. */
293 struct crypto_hash *hmac;
294
295 /* What is our base endpointer? */
296 struct sctp_endpoint *ep;
297
298 struct sctp_bind_bucket *bind_hash;
299 /* Various Socket Options. */
300 __u16 default_stream;
301 __u32 default_ppid;
302 __u16 default_flags;
303 __u32 default_context;
304 __u32 default_timetolive;
305 __u32 default_rcv_context;
306 int max_burst;
307
308 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
309 * the destination address every heartbeat interval. This value
310 * will be inherited by all new associations.
311 */
312 __u32 hbinterval;
313
314 /* This is the max_retrans value for new associations. */
315 __u16 pathmaxrxt;
316
317 /* The initial Path MTU to use for new associations. */
318 __u32 pathmtu;
319
320 /* The default SACK delay timeout for new associations. */
321 __u32 sackdelay;
322 __u32 sackfreq;
323
324 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
325 __u32 param_flags;
326
327 struct sctp_initmsg initmsg;
328 struct sctp_rtoinfo rtoinfo;
329 struct sctp_paddrparams paddrparam;
330 struct sctp_event_subscribe subscribe;
331 struct sctp_assocparams assocparams;
332 int user_frag;
333 __u32 autoclose;
334 __u8 nodelay;
335 __u8 disable_fragments;
336 __u8 v4mapped;
337 __u8 frag_interleave;
338 __u32 adaptation_ind;
339 __u32 pd_point;
340
341 atomic_t pd_mode;
342 /* Receive to here while partial delivery is in effect. */
343 struct sk_buff_head pd_lobby;
344 };
345
sctp_sk(const struct sock * sk)346 static inline struct sctp_sock *sctp_sk(const struct sock *sk)
347 {
348 return (struct sctp_sock *)sk;
349 }
350
sctp_opt2sk(const struct sctp_sock * sp)351 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
352 {
353 return (struct sock *)sp;
354 }
355
356 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
357 struct sctp6_sock {
358 struct sctp_sock sctp;
359 struct ipv6_pinfo inet6;
360 };
361 #endif /* CONFIG_IPV6 */
362
363
364 /* This is our APPLICATION-SPECIFIC state cookie.
365 * THIS IS NOT DICTATED BY THE SPECIFICATION.
366 */
367 /* These are the parts of an association which we send in the cookie.
368 * Most of these are straight out of:
369 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
370 *
371 */
372
373 struct sctp_cookie {
374
375 /* My : Tag expected in every inbound packet and sent
376 * Verification: in the INIT or INIT ACK chunk.
377 * Tag :
378 */
379 __u32 my_vtag;
380
381 /* Peer's : Tag expected in every outbound packet except
382 * Verification: in the INIT chunk.
383 * Tag :
384 */
385 __u32 peer_vtag;
386
387 /* The rest of these are not from the spec, but really need to
388 * be in the cookie.
389 */
390
391 /* My Tie Tag : Assist in discovering a restarting association. */
392 __u32 my_ttag;
393
394 /* Peer's Tie Tag: Assist in discovering a restarting association. */
395 __u32 peer_ttag;
396
397 /* When does this cookie expire? */
398 struct timeval expiration;
399
400 /* Number of inbound/outbound streams which are set
401 * and negotiated during the INIT process.
402 */
403 __u16 sinit_num_ostreams;
404 __u16 sinit_max_instreams;
405
406 /* This is the first sequence number I used. */
407 __u32 initial_tsn;
408
409 /* This holds the originating address of the INIT packet. */
410 union sctp_addr peer_addr;
411
412 /* IG Section 2.35.3
413 * Include the source port of the INIT-ACK
414 */
415 __u16 my_port;
416
417 __u8 prsctp_capable;
418
419 /* Padding for future use */
420 __u8 padding;
421
422 __u32 adaptation_ind;
423
424 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH];
425 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
426 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS];
427
428 /* This is a shim for my peer's INIT packet, followed by
429 * a copy of the raw address list of the association.
430 * The length of the raw address list is saved in the
431 * raw_addr_list_len field, which will be used at the time when
432 * the association TCB is re-constructed from the cookie.
433 */
434 __u32 raw_addr_list_len;
435 struct sctp_init_chunk peer_init[0];
436 };
437
438
439 /* The format of our cookie that we send to our peer. */
440 struct sctp_signed_cookie {
441 __u8 signature[SCTP_SECRET_SIZE];
442 __u32 __pad; /* force sctp_cookie alignment to 64 bits */
443 struct sctp_cookie c;
444 } __packed;
445
446 /* This is another convenience type to allocate memory for address
447 * params for the maximum size and pass such structures around
448 * internally.
449 */
450 union sctp_addr_param {
451 struct sctp_paramhdr p;
452 struct sctp_ipv4addr_param v4;
453 struct sctp_ipv6addr_param v6;
454 };
455
456 /* A convenience type to allow walking through the various
457 * parameters and avoid casting all over the place.
458 */
459 union sctp_params {
460 void *v;
461 struct sctp_paramhdr *p;
462 struct sctp_cookie_preserve_param *life;
463 struct sctp_hostname_param *dns;
464 struct sctp_cookie_param *cookie;
465 struct sctp_supported_addrs_param *sat;
466 struct sctp_ipv4addr_param *v4;
467 struct sctp_ipv6addr_param *v6;
468 union sctp_addr_param *addr;
469 struct sctp_adaptation_ind_param *aind;
470 struct sctp_supported_ext_param *ext;
471 struct sctp_random_param *random;
472 struct sctp_chunks_param *chunks;
473 struct sctp_hmac_algo_param *hmac_algo;
474 struct sctp_addip_param *addip;
475 };
476
477 /* RFC 2960. Section 3.3.5 Heartbeat.
478 * Heartbeat Information: variable length
479 * The Sender-specific Heartbeat Info field should normally include
480 * information about the sender's current time when this HEARTBEAT
481 * chunk is sent and the destination transport address to which this
482 * HEARTBEAT is sent (see Section 8.3).
483 */
484 typedef struct sctp_sender_hb_info {
485 struct sctp_paramhdr param_hdr;
486 union sctp_addr daddr;
487 unsigned long sent_at;
488 __u64 hb_nonce;
489 } __packed sctp_sender_hb_info_t;
490
491 /*
492 * RFC 2960 1.3.2 Sequenced Delivery within Streams
493 *
494 * The term "stream" is used in SCTP to refer to a sequence of user
495 * messages that are to be delivered to the upper-layer protocol in
496 * order with respect to other messages within the same stream. This is
497 * in contrast to its usage in TCP, where it refers to a sequence of
498 * bytes (in this document a byte is assumed to be eight bits).
499 * ...
500 *
501 * This is the structure we use to track both our outbound and inbound
502 * SSN, or Stream Sequence Numbers.
503 */
504
505 struct sctp_stream {
506 __u16 *ssn;
507 unsigned int len;
508 };
509
510 struct sctp_ssnmap {
511 struct sctp_stream in;
512 struct sctp_stream out;
513 int malloced;
514 };
515
516 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
517 gfp_t gfp);
518 void sctp_ssnmap_free(struct sctp_ssnmap *map);
519 void sctp_ssnmap_clear(struct sctp_ssnmap *map);
520
521 /* What is the current SSN number for this stream? */
sctp_ssn_peek(struct sctp_stream * stream,__u16 id)522 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id)
523 {
524 return stream->ssn[id];
525 }
526
527 /* Return the next SSN number for this stream. */
sctp_ssn_next(struct sctp_stream * stream,__u16 id)528 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id)
529 {
530 return stream->ssn[id]++;
531 }
532
533 /* Skip over this ssn and all below. */
sctp_ssn_skip(struct sctp_stream * stream,__u16 id,__u16 ssn)534 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id,
535 __u16 ssn)
536 {
537 stream->ssn[id] = ssn+1;
538 }
539
540 /*
541 * Pointers to address related SCTP functions.
542 * (i.e. things that depend on the address family.)
543 */
544 struct sctp_af {
545 int (*sctp_xmit) (struct sk_buff *skb,
546 struct sctp_transport *);
547 int (*setsockopt) (struct sock *sk,
548 int level,
549 int optname,
550 char __user *optval,
551 unsigned int optlen);
552 int (*getsockopt) (struct sock *sk,
553 int level,
554 int optname,
555 char __user *optval,
556 int __user *optlen);
557 int (*compat_setsockopt) (struct sock *sk,
558 int level,
559 int optname,
560 char __user *optval,
561 unsigned int optlen);
562 int (*compat_getsockopt) (struct sock *sk,
563 int level,
564 int optname,
565 char __user *optval,
566 int __user *optlen);
567 struct dst_entry *(*get_dst) (struct sctp_association *asoc,
568 union sctp_addr *daddr,
569 union sctp_addr *saddr);
570 void (*get_saddr) (struct sctp_sock *sk,
571 struct sctp_association *asoc,
572 struct dst_entry *dst,
573 union sctp_addr *daddr,
574 union sctp_addr *saddr);
575 void (*copy_addrlist) (struct list_head *,
576 struct net_device *);
577 void (*dst_saddr) (union sctp_addr *saddr,
578 struct dst_entry *dst,
579 __be16 port);
580 int (*cmp_addr) (const union sctp_addr *addr1,
581 const union sctp_addr *addr2);
582 void (*addr_copy) (union sctp_addr *dst,
583 union sctp_addr *src);
584 void (*from_skb) (union sctp_addr *,
585 struct sk_buff *skb,
586 int saddr);
587 void (*from_sk) (union sctp_addr *,
588 struct sock *sk);
589 void (*to_sk_saddr) (union sctp_addr *,
590 struct sock *sk);
591 void (*to_sk_daddr) (union sctp_addr *,
592 struct sock *sk);
593 void (*from_addr_param) (union sctp_addr *,
594 union sctp_addr_param *,
595 __be16 port, int iif);
596 int (*to_addr_param) (const union sctp_addr *,
597 union sctp_addr_param *);
598 int (*addr_valid) (union sctp_addr *,
599 struct sctp_sock *,
600 const struct sk_buff *);
601 sctp_scope_t (*scope) (union sctp_addr *);
602 void (*inaddr_any) (union sctp_addr *, __be16);
603 int (*is_any) (const union sctp_addr *);
604 int (*available) (union sctp_addr *,
605 struct sctp_sock *);
606 int (*skb_iif) (const struct sk_buff *sk);
607 int (*is_ce) (const struct sk_buff *sk);
608 void (*seq_dump_addr)(struct seq_file *seq,
609 union sctp_addr *addr);
610 void (*ecn_capable)(struct sock *sk);
611 __u16 net_header_len;
612 int sockaddr_len;
613 sa_family_t sa_family;
614 struct list_head list;
615 };
616
617 struct sctp_af *sctp_get_af_specific(sa_family_t);
618 int sctp_register_af(struct sctp_af *);
619
620 /* Protocol family functions. */
621 struct sctp_pf {
622 void (*event_msgname)(struct sctp_ulpevent *, char *, int *);
623 void (*skb_msgname) (struct sk_buff *, char *, int *);
624 int (*af_supported) (sa_family_t, struct sctp_sock *);
625 int (*cmp_addr) (const union sctp_addr *,
626 const union sctp_addr *,
627 struct sctp_sock *);
628 int (*bind_verify) (struct sctp_sock *, union sctp_addr *);
629 int (*send_verify) (struct sctp_sock *, union sctp_addr *);
630 int (*supported_addrs)(const struct sctp_sock *, __be16 *);
631 struct sock *(*create_accept_sk) (struct sock *sk,
632 struct sctp_association *asoc);
633 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *);
634 struct sctp_af *af;
635 };
636
637
638 /* Structure to track chunk fragments that have been acked, but peer
639 * fragments of the same message have not.
640 */
641 struct sctp_datamsg {
642 /* Chunks waiting to be submitted to lower layer. */
643 struct list_head chunks;
644 /* Reference counting. */
645 atomic_t refcnt;
646 /* When is this message no longer interesting to the peer? */
647 unsigned long expires_at;
648 /* Did the messenge fail to send? */
649 int send_error;
650 u8 send_failed:1,
651 can_abandon:1, /* can chunks from this message can be abandoned. */
652 can_delay; /* should this message be Nagle delayed */
653 };
654
655 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
656 struct sctp_sndrcvinfo *,
657 struct msghdr *, int len);
658 void sctp_datamsg_free(struct sctp_datamsg *);
659 void sctp_datamsg_put(struct sctp_datamsg *);
660 void sctp_chunk_fail(struct sctp_chunk *, int error);
661 int sctp_chunk_abandoned(struct sctp_chunk *);
662
663 /* RFC2960 1.4 Key Terms
664 *
665 * o Chunk: A unit of information within an SCTP packet, consisting of
666 * a chunk header and chunk-specific content.
667 *
668 * As a matter of convenience, we remember the SCTP common header for
669 * each chunk as well as a few other header pointers...
670 */
671 struct sctp_chunk {
672 struct list_head list;
673
674 atomic_t refcnt;
675
676 /* This is our link to the per-transport transmitted list. */
677 struct list_head transmitted_list;
678
679 /* This field is used by chunks that hold fragmented data.
680 * For the first fragment this is the list that holds the rest of
681 * fragments. For the remaining fragments, this is the link to the
682 * frag_list maintained in the first fragment.
683 */
684 struct list_head frag_list;
685
686 /* This points to the sk_buff containing the actual data. */
687 struct sk_buff *skb;
688
689 /* These are the SCTP headers by reverse order in a packet.
690 * Note that some of these may happen more than once. In that
691 * case, we point at the "current" one, whatever that means
692 * for that level of header.
693 */
694
695 /* We point this at the FIRST TLV parameter to chunk_hdr. */
696 union sctp_params param_hdr;
697 union {
698 __u8 *v;
699 struct sctp_datahdr *data_hdr;
700 struct sctp_inithdr *init_hdr;
701 struct sctp_sackhdr *sack_hdr;
702 struct sctp_heartbeathdr *hb_hdr;
703 struct sctp_sender_hb_info *hbs_hdr;
704 struct sctp_shutdownhdr *shutdown_hdr;
705 struct sctp_signed_cookie *cookie_hdr;
706 struct sctp_ecnehdr *ecne_hdr;
707 struct sctp_cwrhdr *ecn_cwr_hdr;
708 struct sctp_errhdr *err_hdr;
709 struct sctp_addiphdr *addip_hdr;
710 struct sctp_fwdtsn_hdr *fwdtsn_hdr;
711 struct sctp_authhdr *auth_hdr;
712 } subh;
713
714 __u8 *chunk_end;
715
716 struct sctp_chunkhdr *chunk_hdr;
717 struct sctphdr *sctp_hdr;
718
719 /* This needs to be recoverable for SCTP_SEND_FAILED events. */
720 struct sctp_sndrcvinfo sinfo;
721
722 /* Which association does this belong to? */
723 struct sctp_association *asoc;
724
725 /* What endpoint received this chunk? */
726 struct sctp_ep_common *rcvr;
727
728 /* We fill this in if we are calculating RTT. */
729 unsigned long sent_at;
730
731 /* What is the origin IP address for this chunk? */
732 union sctp_addr source;
733 /* Destination address for this chunk. */
734 union sctp_addr dest;
735
736 /* For outbound message, track all fragments for SEND_FAILED. */
737 struct sctp_datamsg *msg;
738
739 /* For an inbound chunk, this tells us where it came from.
740 * For an outbound chunk, it tells us where we'd like it to
741 * go. It is NULL if we have no preference.
742 */
743 struct sctp_transport *transport;
744
745 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO
746 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
747 * spec violates the principle premis that all chunks are processed
748 * in order.
749 */
750 struct sk_buff *auth_chunk;
751
752 #define SCTP_CAN_FRTX 0x0
753 #define SCTP_NEED_FRTX 0x1
754 #define SCTP_DONT_FRTX 0x2
755 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */
756 has_tsn:1, /* Does this chunk have a TSN yet? */
757 has_ssn:1, /* Does this chunk have a SSN yet? */
758 singleton:1, /* Only chunk in the packet? */
759 end_of_packet:1, /* Last chunk in the packet? */
760 ecn_ce_done:1, /* Have we processed the ECN CE bit? */
761 pdiscard:1, /* Discard the whole packet now? */
762 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */
763 data_accepted:1, /* At least 1 chunk accepted */
764 auth:1, /* IN: was auth'ed | OUT: needs auth */
765 has_asconf:1, /* IN: have seen an asconf before */
766 tsn_missing_report:2, /* Data chunk missing counter. */
767 fast_retransmit:2; /* Is this chunk fast retransmitted? */
768 };
769
770 void sctp_chunk_hold(struct sctp_chunk *);
771 void sctp_chunk_put(struct sctp_chunk *);
772 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
773 struct iovec *data);
774 void sctp_chunk_free(struct sctp_chunk *);
775 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
776 void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, const void *data);
777 struct sctp_chunk *sctp_chunkify(struct sk_buff *,
778 const struct sctp_association *,
779 struct sock *);
780 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *,
781 union sctp_addr *);
782 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk);
783
784 enum {
785 SCTP_ADDR_NEW, /* new address added to assoc/ep */
786 SCTP_ADDR_SRC, /* address can be used as source */
787 SCTP_ADDR_DEL, /* address about to be deleted */
788 };
789
790 /* This is a structure for holding either an IPv6 or an IPv4 address. */
791 struct sctp_sockaddr_entry {
792 struct list_head list;
793 struct rcu_head rcu;
794 union sctp_addr a;
795 __u8 state;
796 __u8 valid;
797 };
798
799 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *);
800
801 /* This structure holds lists of chunks as we are assembling for
802 * transmission.
803 */
804 struct sctp_packet {
805 /* These are the SCTP header values (host order) for the packet. */
806 __u16 source_port;
807 __u16 destination_port;
808 __u32 vtag;
809
810 /* This contains the payload chunks. */
811 struct list_head chunk_list;
812
813 /* This is the overhead of the sctp and ip headers. */
814 size_t overhead;
815 /* This is the total size of all chunks INCLUDING padding. */
816 size_t size;
817
818 /* The packet is destined for this transport address.
819 * The function we finally use to pass down to the next lower
820 * layer lives in the transport structure.
821 */
822 struct sctp_transport *transport;
823
824 /* pointer to the auth chunk for this packet */
825 struct sctp_chunk *auth;
826
827 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */
828 has_sack:1, /* This packet contains a SACK chunk. */
829 has_auth:1, /* This packet contains an AUTH chunk */
830 has_data:1, /* This packet contains at least 1 DATA chunk */
831 ipfragok:1, /* So let ip fragment this packet */
832 malloced:1; /* Is it malloced? */
833 };
834
835 struct sctp_packet *sctp_packet_init(struct sctp_packet *,
836 struct sctp_transport *,
837 __u16 sport, __u16 dport);
838 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int);
839 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *,
840 struct sctp_chunk *, int);
841 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *,
842 struct sctp_chunk *);
843 int sctp_packet_transmit(struct sctp_packet *);
844 void sctp_packet_free(struct sctp_packet *);
845
sctp_packet_empty(struct sctp_packet * packet)846 static inline int sctp_packet_empty(struct sctp_packet *packet)
847 {
848 return packet->size == packet->overhead;
849 }
850
851 /* This represents a remote transport address.
852 * For local transport addresses, we just use union sctp_addr.
853 *
854 * RFC2960 Section 1.4 Key Terms
855 *
856 * o Transport address: A Transport Address is traditionally defined
857 * by Network Layer address, Transport Layer protocol and Transport
858 * Layer port number. In the case of SCTP running over IP, a
859 * transport address is defined by the combination of an IP address
860 * and an SCTP port number (where SCTP is the Transport protocol).
861 *
862 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control
863 *
864 * o The sender keeps a separate congestion control parameter set for
865 * each of the destination addresses it can send to (not each
866 * source-destination pair but for each destination). The parameters
867 * should decay if the address is not used for a long enough time
868 * period.
869 *
870 */
871 struct sctp_transport {
872 /* A list of transports. */
873 struct list_head transports;
874
875 /* Reference counting. */
876 atomic_t refcnt;
877 __u32 dead:1,
878 /* RTO-Pending : A flag used to track if one of the DATA
879 * chunks sent to this address is currently being
880 * used to compute a RTT. If this flag is 0,
881 * the next DATA chunk sent to this destination
882 * should be used to compute a RTT and this flag
883 * should be set. Every time the RTT
884 * calculation completes (i.e. the DATA chunk
885 * is SACK'd) clear this flag.
886 */
887 rto_pending:1,
888
889 /*
890 * hb_sent : a flag that signals that we have a pending
891 * heartbeat.
892 */
893 hb_sent:1,
894
895 /* Is the Path MTU update pending on this tranport */
896 pmtu_pending:1,
897
898 /* Is this structure kfree()able? */
899 malloced:1;
900
901
902 /* This is the peer's IP address and port. */
903 union sctp_addr ipaddr;
904
905 /* These are the functions we call to handle LLP stuff. */
906 struct sctp_af *af_specific;
907
908 /* Which association do we belong to? */
909 struct sctp_association *asoc;
910
911 /* RFC2960
912 *
913 * 12.3 Per Transport Address Data
914 *
915 * For each destination transport address in the peer's
916 * address list derived from the INIT or INIT ACK chunk, a
917 * number of data elements needs to be maintained including:
918 */
919 /* RTO : The current retransmission timeout value. */
920 unsigned long rto;
921
922 __u32 rtt; /* This is the most recent RTT. */
923
924 /* RTTVAR : The current RTT variation. */
925 __u32 rttvar;
926
927 /* SRTT : The current smoothed round trip time. */
928 __u32 srtt;
929
930 /*
931 * These are the congestion stats.
932 */
933 /* cwnd : The current congestion window. */
934 __u32 cwnd; /* This is the actual cwnd. */
935
936 /* ssthresh : The current slow start threshold value. */
937 __u32 ssthresh;
938
939 /* partial : The tracking method for increase of cwnd when in
940 * bytes acked : congestion avoidance mode (see Section 6.2.2)
941 */
942 __u32 partial_bytes_acked;
943
944 /* Data that has been sent, but not acknowledged. */
945 __u32 flight_size;
946
947 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */
948
949 /* Destination */
950 struct dst_entry *dst;
951 /* Source address. */
952 union sctp_addr saddr;
953
954 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
955 * the destination address every heartbeat interval.
956 */
957 unsigned long hbinterval;
958
959 /* SACK delay timeout */
960 unsigned long sackdelay;
961 __u32 sackfreq;
962
963 /* When was the last time (in jiffies) that we heard from this
964 * transport? We use this to pick new active and retran paths.
965 */
966 unsigned long last_time_heard;
967
968 /* Last time(in jiffies) when cwnd is reduced due to the congestion
969 * indication based on ECNE chunk.
970 */
971 unsigned long last_time_ecne_reduced;
972
973 /* This is the max_retrans value for the transport and will
974 * be initialized from the assocs value. This can be changed
975 * using SCTP_SET_PEER_ADDR_PARAMS socket option.
976 */
977 __u16 pathmaxrxt;
978
979 /* PMTU : The current known path MTU. */
980 __u32 pathmtu;
981
982 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
983 __u32 param_flags;
984
985 /* The number of times INIT has been sent on this transport. */
986 int init_sent_count;
987
988 /* state : The current state of this destination,
989 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN.
990 */
991 int state;
992
993 /* These are the error stats for this destination. */
994
995 /* Error count : The current error count for this destination. */
996 unsigned short error_count;
997
998 /* Per : A timer used by each destination.
999 * Destination :
1000 * Timer :
1001 *
1002 * [Everywhere else in the text this is called T3-rtx. -ed]
1003 */
1004 struct timer_list T3_rtx_timer;
1005
1006 /* Heartbeat timer is per destination. */
1007 struct timer_list hb_timer;
1008
1009 /* Timer to handle ICMP proto unreachable envets */
1010 struct timer_list proto_unreach_timer;
1011
1012 /* Since we're using per-destination retransmission timers
1013 * (see above), we're also using per-destination "transmitted"
1014 * queues. This probably ought to be a private struct
1015 * accessible only within the outqueue, but it's not, yet.
1016 */
1017 struct list_head transmitted;
1018
1019 /* We build bundle-able packets for this transport here. */
1020 struct sctp_packet packet;
1021
1022 /* This is the list of transports that have chunks to send. */
1023 struct list_head send_ready;
1024
1025 /* State information saved for SFR_CACC algorithm. The key
1026 * idea in SFR_CACC is to maintain state at the sender on a
1027 * per-destination basis when a changeover happens.
1028 * char changeover_active;
1029 * char cycling_changeover;
1030 * __u32 next_tsn_at_change;
1031 * char cacc_saw_newack;
1032 */
1033 struct {
1034 /* An unsigned integer, which stores the next TSN to be
1035 * used by the sender, at the moment of changeover.
1036 */
1037 __u32 next_tsn_at_change;
1038
1039 /* A flag which indicates the occurrence of a changeover */
1040 char changeover_active;
1041
1042 /* A flag which indicates whether the change of primary is
1043 * the first switch to this destination address during an
1044 * active switch.
1045 */
1046 char cycling_changeover;
1047
1048 /* A temporary flag, which is used during the processing of
1049 * a SACK to estimate the causative TSN(s)'s group.
1050 */
1051 char cacc_saw_newack;
1052 } cacc;
1053
1054 /* 64-bit random number sent with heartbeat. */
1055 __u64 hb_nonce;
1056 };
1057
1058 struct sctp_transport *sctp_transport_new(const union sctp_addr *,
1059 gfp_t);
1060 void sctp_transport_set_owner(struct sctp_transport *,
1061 struct sctp_association *);
1062 void sctp_transport_route(struct sctp_transport *, union sctp_addr *,
1063 struct sctp_sock *);
1064 void sctp_transport_pmtu(struct sctp_transport *);
1065 void sctp_transport_free(struct sctp_transport *);
1066 void sctp_transport_reset_timers(struct sctp_transport *);
1067 void sctp_transport_hold(struct sctp_transport *);
1068 void sctp_transport_put(struct sctp_transport *);
1069 void sctp_transport_update_rto(struct sctp_transport *, __u32);
1070 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
1071 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
1072 void sctp_transport_burst_limited(struct sctp_transport *);
1073 void sctp_transport_burst_reset(struct sctp_transport *);
1074 unsigned long sctp_transport_timeout(struct sctp_transport *);
1075 void sctp_transport_reset(struct sctp_transport *);
1076 void sctp_transport_update_pmtu(struct sctp_transport *, u32);
1077
1078
1079 /* This is the structure we use to queue packets as they come into
1080 * SCTP. We write packets to it and read chunks from it.
1081 */
1082 struct sctp_inq {
1083 /* This is actually a queue of sctp_chunk each
1084 * containing a partially decoded packet.
1085 */
1086 struct list_head in_chunk_list;
1087 /* This is the packet which is currently off the in queue and is
1088 * being worked on through the inbound chunk processing.
1089 */
1090 struct sctp_chunk *in_progress;
1091
1092 /* This is the delayed task to finish delivering inbound
1093 * messages.
1094 */
1095 struct work_struct immediate;
1096
1097 int malloced; /* Is this structure kfree()able? */
1098 };
1099
1100 void sctp_inq_init(struct sctp_inq *);
1101 void sctp_inq_free(struct sctp_inq *);
1102 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet);
1103 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *);
1104 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *);
1105 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t);
1106
1107 /* This is the structure we use to hold outbound chunks. You push
1108 * chunks in and they automatically pop out the other end as bundled
1109 * packets (it calls (*output_handler)()).
1110 *
1111 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1,
1112 * and 8.2 of the v13 draft.
1113 *
1114 * It handles retransmissions. The connection to the timeout portion
1115 * of the state machine is through sctp_..._timeout() and timeout_handler.
1116 *
1117 * If you feed it SACKs, it will eat them.
1118 *
1119 * If you give it big chunks, it will fragment them.
1120 *
1121 * It assigns TSN's to data chunks. This happens at the last possible
1122 * instant before transmission.
1123 *
1124 * When free()'d, it empties itself out via output_handler().
1125 */
1126 struct sctp_outq {
1127 struct sctp_association *asoc;
1128
1129 /* Data pending that has never been transmitted. */
1130 struct list_head out_chunk_list;
1131
1132 unsigned out_qlen; /* Total length of queued data chunks. */
1133
1134 /* Error of send failed, may used in SCTP_SEND_FAILED event. */
1135 unsigned error;
1136
1137 /* These are control chunks we want to send. */
1138 struct list_head control_chunk_list;
1139
1140 /* These are chunks that have been sacked but are above the
1141 * CTSN, or cumulative tsn ack point.
1142 */
1143 struct list_head sacked;
1144
1145 /* Put chunks on this list to schedule them for
1146 * retransmission.
1147 */
1148 struct list_head retransmit;
1149
1150 /* Put chunks on this list to save them for FWD TSN processing as
1151 * they were abandoned.
1152 */
1153 struct list_head abandoned;
1154
1155 /* How many unackd bytes do we have in-flight? */
1156 __u32 outstanding_bytes;
1157
1158 /* Are we doing fast-rtx on this queue */
1159 char fast_rtx;
1160
1161 /* Corked? */
1162 char cork;
1163
1164 /* Is this structure empty? */
1165 char empty;
1166
1167 /* Are we kfree()able? */
1168 char malloced;
1169 };
1170
1171 void sctp_outq_init(struct sctp_association *, struct sctp_outq *);
1172 void sctp_outq_teardown(struct sctp_outq *);
1173 void sctp_outq_free(struct sctp_outq*);
1174 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk);
1175 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *);
1176 int sctp_outq_is_empty(const struct sctp_outq *);
1177 void sctp_outq_restart(struct sctp_outq *);
1178
1179 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *,
1180 sctp_retransmit_reason_t);
1181 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8);
1182 int sctp_outq_uncork(struct sctp_outq *);
1183 /* Uncork and flush an outqueue. */
sctp_outq_cork(struct sctp_outq * q)1184 static inline void sctp_outq_cork(struct sctp_outq *q)
1185 {
1186 q->cork = 1;
1187 }
1188
1189 /* These bind address data fields common between endpoints and associations */
1190 struct sctp_bind_addr {
1191
1192 /* RFC 2960 12.1 Parameters necessary for the SCTP instance
1193 *
1194 * SCTP Port: The local SCTP port number the endpoint is
1195 * bound to.
1196 */
1197 __u16 port;
1198
1199 /* RFC 2960 12.1 Parameters necessary for the SCTP instance
1200 *
1201 * Address List: The list of IP addresses that this instance
1202 * has bound. This information is passed to one's
1203 * peer(s) in INIT and INIT ACK chunks.
1204 */
1205 struct list_head address_list;
1206
1207 int malloced; /* Are we kfree()able? */
1208 };
1209
1210 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port);
1211 void sctp_bind_addr_free(struct sctp_bind_addr *);
1212 int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
1213 const struct sctp_bind_addr *src,
1214 sctp_scope_t scope, gfp_t gfp,
1215 int flags);
1216 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
1217 const struct sctp_bind_addr *src,
1218 gfp_t gfp);
1219 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
1220 __u8 addr_state, gfp_t gfp);
1221 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
1222 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
1223 struct sctp_sock *);
1224 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *,
1225 struct sctp_sock *, struct sctp_sock *);
1226 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
1227 const union sctp_addr *addr);
1228 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
1229 const union sctp_addr *addrs,
1230 int addrcnt,
1231 struct sctp_sock *opt);
1232 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
1233 int *addrs_len,
1234 gfp_t gfp);
1235 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len,
1236 __u16 port, gfp_t gfp);
1237
1238 sctp_scope_t sctp_scope(const union sctp_addr *);
1239 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope);
1240 int sctp_is_any(struct sock *sk, const union sctp_addr *addr);
1241 int sctp_addr_is_valid(const union sctp_addr *addr);
1242
1243
1244 /* What type of endpoint? */
1245 typedef enum {
1246 SCTP_EP_TYPE_SOCKET,
1247 SCTP_EP_TYPE_ASSOCIATION,
1248 } sctp_endpoint_type_t;
1249
1250 /*
1251 * A common base class to bridge the implmentation view of a
1252 * socket (usually listening) endpoint versus an association's
1253 * local endpoint.
1254 * This common structure is useful for several purposes:
1255 * 1) Common interface for lookup routines.
1256 * a) Subfunctions work for either endpoint or association
1257 * b) Single interface to lookup allows hiding the lookup lock rather
1258 * than acquiring it externally.
1259 * 2) Common interface for the inbound chunk handling/state machine.
1260 * 3) Common object handling routines for reference counting, etc.
1261 * 4) Disentangle association lookup from endpoint lookup, where we
1262 * do not have to find our endpoint to find our association.
1263 *
1264 */
1265
1266 struct sctp_ep_common {
1267 /* Fields to help us manage our entries in the hash tables. */
1268 struct hlist_node node;
1269 int hashent;
1270
1271 /* Runtime type information. What kind of endpoint is this? */
1272 sctp_endpoint_type_t type;
1273
1274 /* Some fields to help us manage this object.
1275 * refcnt - Reference count access to this object.
1276 * dead - Do not attempt to use this object.
1277 * malloced - Do we need to kfree this object?
1278 */
1279 atomic_t refcnt;
1280 char dead;
1281 char malloced;
1282
1283 /* What socket does this endpoint belong to? */
1284 struct sock *sk;
1285
1286 /* This is where we receive inbound chunks. */
1287 struct sctp_inq inqueue;
1288
1289 /* This substructure includes the defining parameters of the
1290 * endpoint:
1291 * bind_addr.port is our shared port number.
1292 * bind_addr.address_list is our set of local IP addresses.
1293 */
1294 struct sctp_bind_addr bind_addr;
1295 };
1296
1297
1298 /* RFC Section 1.4 Key Terms
1299 *
1300 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a
1301 * multi-homed host, an SCTP endpoint is represented to its peers as a
1302 * combination of a set of eligible destination transport addresses to
1303 * which SCTP packets can be sent and a set of eligible source
1304 * transport addresses from which SCTP packets can be received.
1305 * All transport addresses used by an SCTP endpoint must use the
1306 * same port number, but can use multiple IP addresses. A transport
1307 * address used by an SCTP endpoint must not be used by another
1308 * SCTP endpoint. In other words, a transport address is unique
1309 * to an SCTP endpoint.
1310 *
1311 * From an implementation perspective, each socket has one of these.
1312 * A TCP-style socket will have exactly one association on one of
1313 * these. An UDP-style socket will have multiple associations hanging
1314 * off one of these.
1315 */
1316
1317 struct sctp_endpoint {
1318 /* Common substructure for endpoint and association. */
1319 struct sctp_ep_common base;
1320
1321 /* Associations: A list of current associations and mappings
1322 * to the data consumers for each association. This
1323 * may be in the form of a hash table or other
1324 * implementation dependent structure. The data
1325 * consumers may be process identification
1326 * information such as file descriptors, named pipe
1327 * pointer, or table pointers dependent on how SCTP
1328 * is implemented.
1329 */
1330 /* This is really a list of struct sctp_association entries. */
1331 struct list_head asocs;
1332
1333 /* Secret Key: A secret key used by this endpoint to compute
1334 * the MAC. This SHOULD be a cryptographic quality
1335 * random number with a sufficient length.
1336 * Discussion in [RFC1750] can be helpful in
1337 * selection of the key.
1338 */
1339 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE];
1340 int current_key;
1341 int last_key;
1342 int key_changed_at;
1343
1344 /* digest: This is a digest of the sctp cookie. This field is
1345 * only used on the receive path when we try to validate
1346 * that the cookie has not been tampered with. We put
1347 * this here so we pre-allocate this once and can re-use
1348 * on every receive.
1349 */
1350 __u8 *digest;
1351
1352 /* sendbuf acct. policy. */
1353 __u32 sndbuf_policy;
1354
1355 /* rcvbuf acct. policy. */
1356 __u32 rcvbuf_policy;
1357
1358 /* SCTP AUTH: array of the HMACs that will be allocated
1359 * we need this per association so that we don't serialize
1360 */
1361 struct crypto_hash **auth_hmacs;
1362
1363 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
1364 struct sctp_hmac_algo_param *auth_hmacs_list;
1365
1366 /* SCTP-AUTH: chunks to authenticate encoded into parameter */
1367 struct sctp_chunks_param *auth_chunk_list;
1368
1369 /* SCTP-AUTH: endpoint shared keys */
1370 struct list_head endpoint_shared_keys;
1371 __u16 active_key_id;
1372 };
1373
1374 /* Recover the outter endpoint structure. */
sctp_ep(struct sctp_ep_common * base)1375 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base)
1376 {
1377 struct sctp_endpoint *ep;
1378
1379 ep = container_of(base, struct sctp_endpoint, base);
1380 return ep;
1381 }
1382
1383 /* These are function signatures for manipulating endpoints. */
1384 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t);
1385 void sctp_endpoint_free(struct sctp_endpoint *);
1386 void sctp_endpoint_put(struct sctp_endpoint *);
1387 void sctp_endpoint_hold(struct sctp_endpoint *);
1388 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *);
1389 struct sctp_association *sctp_endpoint_lookup_assoc(
1390 const struct sctp_endpoint *ep,
1391 const union sctp_addr *paddr,
1392 struct sctp_transport **);
1393 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *,
1394 const union sctp_addr *);
1395 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
1396 const union sctp_addr *);
1397 int sctp_has_association(const union sctp_addr *laddr,
1398 const union sctp_addr *paddr);
1399
1400 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t,
1401 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk,
1402 struct sctp_chunk **err_chunk);
1403 int sctp_process_init(struct sctp_association *, sctp_cid_t cid,
1404 const union sctp_addr *peer,
1405 sctp_init_chunk_t *init, gfp_t gfp);
1406 __u32 sctp_generate_tag(const struct sctp_endpoint *);
1407 __u32 sctp_generate_tsn(const struct sctp_endpoint *);
1408
1409 struct sctp_inithdr_host {
1410 __u32 init_tag;
1411 __u32 a_rwnd;
1412 __u16 num_outbound_streams;
1413 __u16 num_inbound_streams;
1414 __u32 initial_tsn;
1415 };
1416
1417 /* RFC2960
1418 *
1419 * 12. Recommended Transmission Control Block (TCB) Parameters
1420 *
1421 * This section details a recommended set of parameters that should
1422 * be contained within the TCB for an implementation. This section is
1423 * for illustrative purposes and should not be deemed as requirements
1424 * on an implementation or as an exhaustive list of all parameters
1425 * inside an SCTP TCB. Each implementation may need its own additional
1426 * parameters for optimization.
1427 */
1428
1429
1430 /* Here we have information about each individual association. */
1431 struct sctp_association {
1432
1433 /* A base structure common to endpoint and association.
1434 * In this context, it represents the associations's view
1435 * of the local endpoint of the association.
1436 */
1437 struct sctp_ep_common base;
1438
1439 /* Associations on the same socket. */
1440 struct list_head asocs;
1441
1442 /* association id. */
1443 sctp_assoc_t assoc_id;
1444
1445 /* This is our parent endpoint. */
1446 struct sctp_endpoint *ep;
1447
1448 /* These are those association elements needed in the cookie. */
1449 struct sctp_cookie c;
1450
1451 /* This is all information about our peer. */
1452 struct {
1453 /* rwnd
1454 *
1455 * Peer Rwnd : Current calculated value of the peer's rwnd.
1456 */
1457 __u32 rwnd;
1458
1459 /* transport_addr_list
1460 *
1461 * Peer : A list of SCTP transport addresses that the
1462 * Transport : peer is bound to. This information is derived
1463 * Address : from the INIT or INIT ACK and is used to
1464 * List : associate an inbound packet with a given
1465 * : association. Normally this information is
1466 * : hashed or keyed for quick lookup and access
1467 * : of the TCB.
1468 * : The list is also initialized with the list
1469 * : of addresses passed with the sctp_connectx()
1470 * : call.
1471 *
1472 * It is a list of SCTP_transport's.
1473 */
1474 struct list_head transport_addr_list;
1475
1476 /* transport_count
1477 *
1478 * Peer : A count of the number of peer addresses
1479 * Transport : in the Peer Transport Address List.
1480 * Address :
1481 * Count :
1482 */
1483 __u16 transport_count;
1484
1485 /* port
1486 * The transport layer port number.
1487 */
1488 __u16 port;
1489
1490 /* primary_path
1491 *
1492 * Primary : This is the current primary destination
1493 * Path : transport address of the peer endpoint. It
1494 * : may also specify a source transport address
1495 * : on this endpoint.
1496 *
1497 * All of these paths live on transport_addr_list.
1498 *
1499 * At the bakeoffs, we discovered that the intent of
1500 * primaryPath is that it only changes when the ULP
1501 * asks to have it changed. We add the activePath to
1502 * designate the connection we are currently using to
1503 * transmit new data and most control chunks.
1504 */
1505 struct sctp_transport *primary_path;
1506
1507 /* Cache the primary path address here, when we
1508 * need a an address for msg_name.
1509 */
1510 union sctp_addr primary_addr;
1511
1512 /* active_path
1513 * The path that we are currently using to
1514 * transmit new data and most control chunks.
1515 */
1516 struct sctp_transport *active_path;
1517
1518 /* retran_path
1519 *
1520 * RFC2960 6.4 Multi-homed SCTP Endpoints
1521 * ...
1522 * Furthermore, when its peer is multi-homed, an
1523 * endpoint SHOULD try to retransmit a chunk to an
1524 * active destination transport address that is
1525 * different from the last destination address to
1526 * which the DATA chunk was sent.
1527 */
1528 struct sctp_transport *retran_path;
1529
1530 /* Pointer to last transport I have sent on. */
1531 struct sctp_transport *last_sent_to;
1532
1533 /* This is the last transport I have received DATA on. */
1534 struct sctp_transport *last_data_from;
1535
1536 /*
1537 * Mapping An array of bits or bytes indicating which out of
1538 * Array order TSN's have been received (relative to the
1539 * Last Rcvd TSN). If no gaps exist, i.e. no out of
1540 * order packets have been received, this array
1541 * will be set to all zero. This structure may be
1542 * in the form of a circular buffer or bit array.
1543 *
1544 * Last Rcvd : This is the last TSN received in
1545 * TSN : sequence. This value is set initially by
1546 * : taking the peer's Initial TSN, received in
1547 * : the INIT or INIT ACK chunk, and subtracting
1548 * : one from it.
1549 *
1550 * Throughout most of the specification this is called the
1551 * "Cumulative TSN ACK Point". In this case, we
1552 * ignore the advice in 12.2 in favour of the term
1553 * used in the bulk of the text. This value is hidden
1554 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn().
1555 */
1556 struct sctp_tsnmap tsn_map;
1557
1558 /* Ack State : This flag indicates if the next received
1559 * : packet is to be responded to with a
1560 * : SACK. This is initializedto 0. When a packet
1561 * : is received it is incremented. If this value
1562 * : reaches 2 or more, a SACK is sent and the
1563 * : value is reset to 0. Note: This is used only
1564 * : when no DATA chunks are received out of
1565 * : order. When DATA chunks are out of order,
1566 * : SACK's are not delayed (see Section 6).
1567 */
1568 __u8 sack_needed; /* Do we need to sack the peer? */
1569 __u32 sack_cnt;
1570
1571 /* These are capabilities which our peer advertised. */
1572 __u8 ecn_capable:1, /* Can peer do ECN? */
1573 ipv4_address:1, /* Peer understands IPv4 addresses? */
1574 ipv6_address:1, /* Peer understands IPv6 addresses? */
1575 hostname_address:1, /* Peer understands DNS addresses? */
1576 asconf_capable:1, /* Does peer support ADDIP? */
1577 prsctp_capable:1, /* Can peer do PR-SCTP? */
1578 auth_capable:1; /* Is peer doing SCTP-AUTH? */
1579
1580 __u32 adaptation_ind; /* Adaptation Code point. */
1581
1582 /* This mask is used to disable sending the ASCONF chunk
1583 * with specified parameter to peer.
1584 */
1585 __be16 addip_disabled_mask;
1586
1587 struct sctp_inithdr_host i;
1588 int cookie_len;
1589 void *cookie;
1590
1591 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk.
1592 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the
1593 * Initial TSN Value minus 1
1594 */
1595 __u32 addip_serial;
1596
1597 /* SCTP-AUTH: We need to know pears random number, hmac list
1598 * and authenticated chunk list. All that is part of the
1599 * cookie and these are just pointers to those locations
1600 */
1601 sctp_random_param_t *peer_random;
1602 sctp_chunks_param_t *peer_chunks;
1603 sctp_hmac_algo_param_t *peer_hmacs;
1604 } peer;
1605
1606 /* State : A state variable indicating what state the
1607 * : association is in, i.e. COOKIE-WAIT,
1608 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING,
1609 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT.
1610 *
1611 * Note: No "CLOSED" state is illustrated since if a
1612 * association is "CLOSED" its TCB SHOULD be removed.
1613 *
1614 * In this implementation we DO have a CLOSED
1615 * state which is used during initiation and shutdown.
1616 *
1617 * State takes values from SCTP_STATE_*.
1618 */
1619 sctp_state_t state;
1620
1621 /* The cookie life I award for any cookie. */
1622 struct timeval cookie_life;
1623
1624 /* Overall : The overall association error count.
1625 * Error Count : [Clear this any time I get something.]
1626 */
1627 int overall_error_count;
1628
1629 /* These are the association's initial, max, and min RTO values.
1630 * These values will be initialized by system defaults, but can
1631 * be modified via the SCTP_RTOINFO socket option.
1632 */
1633 unsigned long rto_initial;
1634 unsigned long rto_max;
1635 unsigned long rto_min;
1636
1637 /* Maximum number of new data packets that can be sent in a burst. */
1638 int max_burst;
1639
1640 /* This is the max_retrans value for the association. This value will
1641 * be initialized initialized from system defaults, but can be
1642 * modified by the SCTP_ASSOCINFO socket option.
1643 */
1644 int max_retrans;
1645
1646 /* Maximum number of times the endpoint will retransmit INIT */
1647 __u16 max_init_attempts;
1648
1649 /* How many times have we resent an INIT? */
1650 __u16 init_retries;
1651
1652 /* The largest timeout or RTO value to use in attempting an INIT */
1653 unsigned long max_init_timeo;
1654
1655 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
1656 * the destination address every heartbeat interval. This value
1657 * will be inherited by all new transports.
1658 */
1659 unsigned long hbinterval;
1660
1661 /* This is the max_retrans value for new transports in the
1662 * association.
1663 */
1664 __u16 pathmaxrxt;
1665
1666 /* Flag that path mtu update is pending */
1667 __u8 pmtu_pending;
1668
1669 /* Association : The smallest PMTU discovered for all of the
1670 * PMTU : peer's transport addresses.
1671 */
1672 __u32 pathmtu;
1673
1674 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
1675 __u32 param_flags;
1676
1677 /* SACK delay timeout */
1678 unsigned long sackdelay;
1679 __u32 sackfreq;
1680
1681
1682 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES];
1683 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES];
1684
1685 /* Transport to which SHUTDOWN chunk was last sent. */
1686 struct sctp_transport *shutdown_last_sent_to;
1687
1688 /* How many times have we resent a SHUTDOWN */
1689 int shutdown_retries;
1690
1691 /* Transport to which INIT chunk was last sent. */
1692 struct sctp_transport *init_last_sent_to;
1693
1694 /* Next TSN : The next TSN number to be assigned to a new
1695 * : DATA chunk. This is sent in the INIT or INIT
1696 * : ACK chunk to the peer and incremented each
1697 * : time a DATA chunk is assigned a TSN
1698 * : (normally just prior to transmit or during
1699 * : fragmentation).
1700 */
1701 __u32 next_tsn;
1702
1703 /*
1704 * Last Rcvd : This is the last TSN received in sequence. This value
1705 * TSN : is set initially by taking the peer's Initial TSN,
1706 * : received in the INIT or INIT ACK chunk, and
1707 * : subtracting one from it.
1708 *
1709 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point.
1710 */
1711
1712 __u32 ctsn_ack_point;
1713
1714 /* PR-SCTP Advanced.Peer.Ack.Point */
1715 __u32 adv_peer_ack_point;
1716
1717 /* Highest TSN that is acknowledged by incoming SACKs. */
1718 __u32 highest_sacked;
1719
1720 /* TSN marking the fast recovery exit point */
1721 __u32 fast_recovery_exit;
1722
1723 /* Flag to track the current fast recovery state */
1724 __u8 fast_recovery;
1725
1726 /* The number of unacknowledged data chunks. Reported through
1727 * the SCTP_STATUS sockopt.
1728 */
1729 __u16 unack_data;
1730
1731 /* The total number of data chunks that we've had to retransmit
1732 * as the result of a T3 timer expiration
1733 */
1734 __u32 rtx_data_chunks;
1735
1736 /* This is the association's receive buffer space. This value is used
1737 * to set a_rwnd field in an INIT or a SACK chunk.
1738 */
1739 __u32 rwnd;
1740
1741 /* This is the last advertised value of rwnd over a SACK chunk. */
1742 __u32 a_rwnd;
1743
1744 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed
1745 * to slop over a maximum of the association's frag_point.
1746 */
1747 __u32 rwnd_over;
1748
1749 /* Keeps treack of rwnd pressure. This happens when we have
1750 * a window, but not recevie buffer (i.e small packets). This one
1751 * is releases slowly (1 PMTU at a time ).
1752 */
1753 __u32 rwnd_press;
1754
1755 /* This is the sndbuf size in use for the association.
1756 * This corresponds to the sndbuf size for the association,
1757 * as specified in the sk->sndbuf.
1758 */
1759 int sndbuf_used;
1760
1761 /* This is the amount of memory that this association has allocated
1762 * in the receive path at any given time.
1763 */
1764 atomic_t rmem_alloc;
1765
1766 /* This is the wait queue head for send requests waiting on
1767 * the association sndbuf space.
1768 */
1769 wait_queue_head_t wait;
1770
1771 /* The message size at which SCTP fragmentation will occur. */
1772 __u32 frag_point;
1773 __u32 user_frag;
1774
1775 /* Counter used to count INIT errors. */
1776 int init_err_counter;
1777
1778 /* Count the number of INIT cycles (for doubling timeout). */
1779 int init_cycle;
1780
1781 /* Default send parameters. */
1782 __u16 default_stream;
1783 __u16 default_flags;
1784 __u32 default_ppid;
1785 __u32 default_context;
1786 __u32 default_timetolive;
1787
1788 /* Default receive parameters */
1789 __u32 default_rcv_context;
1790
1791 /* This tracks outbound ssn for a given stream. */
1792 struct sctp_ssnmap *ssnmap;
1793
1794 /* All outbound chunks go through this structure. */
1795 struct sctp_outq outqueue;
1796
1797 /* A smart pipe that will handle reordering and fragmentation,
1798 * as well as handle passing events up to the ULP.
1799 */
1800 struct sctp_ulpq ulpq;
1801
1802 /* Last TSN that caused an ECNE Chunk to be sent. */
1803 __u32 last_ecne_tsn;
1804
1805 /* Last TSN that caused a CWR Chunk to be sent. */
1806 __u32 last_cwr_tsn;
1807
1808 /* How many duplicated TSNs have we seen? */
1809 int numduptsns;
1810
1811 /* Number of seconds of idle time before an association is closed.
1812 * In the association context, this is really used as a boolean
1813 * since the real timeout is stored in the timeouts array
1814 */
1815 __u32 autoclose;
1816
1817 /* These are to support
1818 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses
1819 * and Enforcement of Flow and Message Limits"
1820 * <draft-ietf-tsvwg-addip-sctp-02.txt>
1821 * or "ADDIP" for short.
1822 */
1823
1824
1825
1826 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
1827 *
1828 * R1) One and only one ASCONF Chunk MAY be in transit and
1829 * unacknowledged at any one time. If a sender, after sending
1830 * an ASCONF chunk, decides it needs to transfer another
1831 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1832 * returns from the previous ASCONF Chunk before sending a
1833 * subsequent ASCONF. Note this restriction binds each side,
1834 * so at any time two ASCONF may be in-transit on any given
1835 * association (one sent from each endpoint).
1836 *
1837 * [This is our one-and-only-one ASCONF in flight. If we do
1838 * not have an ASCONF in flight, this is NULL.]
1839 */
1840 struct sctp_chunk *addip_last_asconf;
1841
1842 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk.
1843 *
1844 * This is needed to implement itmes E1 - E4 of the updated
1845 * spec. Here is the justification:
1846 *
1847 * Since the peer may bundle multiple ASCONF chunks toward us,
1848 * we now need the ability to cache multiple ACKs. The section
1849 * describes in detail how they are cached and cleaned up.
1850 */
1851 struct list_head asconf_ack_list;
1852
1853 /* These ASCONF chunks are waiting to be sent.
1854 *
1855 * These chunaks can't be pushed to outqueue until receiving
1856 * ASCONF_ACK for the previous ASCONF indicated by
1857 * addip_last_asconf, so as to guarantee that only one ASCONF
1858 * is in flight at any time.
1859 *
1860 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
1861 *
1862 * In defining the ASCONF Chunk transfer procedures, it is
1863 * essential that these transfers MUST NOT cause congestion
1864 * within the network. To achieve this, we place these
1865 * restrictions on the transfer of ASCONF Chunks:
1866 *
1867 * R1) One and only one ASCONF Chunk MAY be in transit and
1868 * unacknowledged at any one time. If a sender, after sending
1869 * an ASCONF chunk, decides it needs to transfer another
1870 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1871 * returns from the previous ASCONF Chunk before sending a
1872 * subsequent ASCONF. Note this restriction binds each side,
1873 * so at any time two ASCONF may be in-transit on any given
1874 * association (one sent from each endpoint).
1875 *
1876 *
1877 * [I really think this is EXACTLY the sort of intelligence
1878 * which already resides in sctp_outq. Please move this
1879 * queue and its supporting logic down there. --piggy]
1880 */
1881 struct list_head addip_chunk_list;
1882
1883 /* ADDIP Section 4.1 ASCONF Chunk Procedures
1884 *
1885 * A2) A serial number should be assigned to the Chunk. The
1886 * serial number SHOULD be a monotonically increasing
1887 * number. The serial number SHOULD be initialized at
1888 * the start of the association to the same value as the
1889 * Initial TSN and every time a new ASCONF chunk is created
1890 * it is incremented by one after assigning the serial number
1891 * to the newly created chunk.
1892 *
1893 * ADDIP
1894 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF)
1895 *
1896 * Serial Number : 32 bits (unsigned integer)
1897 *
1898 * This value represents a Serial Number for the ASCONF
1899 * Chunk. The valid range of Serial Number is from 0 to
1900 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0
1901 * after reaching 4294967295.
1902 */
1903 __u32 addip_serial;
1904
1905 /* SCTP AUTH: list of the endpoint shared keys. These
1906 * keys are provided out of band by the user applicaton
1907 * and can't change during the lifetime of the association
1908 */
1909 struct list_head endpoint_shared_keys;
1910
1911 /* SCTP AUTH:
1912 * The current generated assocaition shared key (secret)
1913 */
1914 struct sctp_auth_bytes *asoc_shared_key;
1915
1916 /* SCTP AUTH: hmac id of the first peer requested algorithm
1917 * that we support.
1918 */
1919 __u16 default_hmac_id;
1920
1921 __u16 active_key_id;
1922
1923 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */
1924 temp:1; /* Is it a temporary association? */
1925 };
1926
1927
1928 /* An eyecatcher for determining if we are really looking at an
1929 * association data structure.
1930 */
1931 enum {
1932 SCTP_ASSOC_EYECATCHER = 0xa550c123,
1933 };
1934
1935 /* Recover the outter association structure. */
sctp_assoc(struct sctp_ep_common * base)1936 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base)
1937 {
1938 struct sctp_association *asoc;
1939
1940 asoc = container_of(base, struct sctp_association, base);
1941 return asoc;
1942 }
1943
1944 /* These are function signatures for manipulating associations. */
1945
1946
1947 struct sctp_association *
1948 sctp_association_new(const struct sctp_endpoint *, const struct sock *,
1949 sctp_scope_t scope, gfp_t gfp);
1950 void sctp_association_free(struct sctp_association *);
1951 void sctp_association_put(struct sctp_association *);
1952 void sctp_association_hold(struct sctp_association *);
1953
1954 struct sctp_transport *sctp_assoc_choose_alter_transport(
1955 struct sctp_association *, struct sctp_transport *);
1956 void sctp_assoc_update_retran_path(struct sctp_association *);
1957 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *,
1958 const union sctp_addr *);
1959 int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
1960 const union sctp_addr *laddr);
1961 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *,
1962 const union sctp_addr *address,
1963 const gfp_t gfp,
1964 const int peer_state);
1965 void sctp_assoc_del_peer(struct sctp_association *asoc,
1966 const union sctp_addr *addr);
1967 void sctp_assoc_rm_peer(struct sctp_association *asoc,
1968 struct sctp_transport *peer);
1969 void sctp_assoc_control_transport(struct sctp_association *,
1970 struct sctp_transport *,
1971 sctp_transport_cmd_t, sctp_sn_error_t);
1972 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32);
1973 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *,
1974 const union sctp_addr *,
1975 const union sctp_addr *);
1976 void sctp_assoc_migrate(struct sctp_association *, struct sock *);
1977 void sctp_assoc_update(struct sctp_association *old,
1978 struct sctp_association *new);
1979
1980 __u32 sctp_association_get_next_tsn(struct sctp_association *);
1981
1982 void sctp_assoc_sync_pmtu(struct sctp_association *);
1983 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned);
1984 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned);
1985 void sctp_assoc_set_primary(struct sctp_association *,
1986 struct sctp_transport *);
1987 void sctp_assoc_del_nonprimary_peers(struct sctp_association *,
1988 struct sctp_transport *);
1989 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *,
1990 sctp_scope_t, gfp_t);
1991 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
1992 struct sctp_cookie*,
1993 gfp_t gfp);
1994 int sctp_assoc_set_id(struct sctp_association *, gfp_t);
1995 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc);
1996 struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
1997 const struct sctp_association *asoc,
1998 __be32 serial);
1999
2000
2001 int sctp_cmp_addr_exact(const union sctp_addr *ss1,
2002 const union sctp_addr *ss2);
2003 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc);
2004
2005 /* A convenience structure to parse out SCTP specific CMSGs. */
2006 typedef struct sctp_cmsgs {
2007 struct sctp_initmsg *init;
2008 struct sctp_sndrcvinfo *info;
2009 } sctp_cmsgs_t;
2010
2011 /* Structure for tracking memory objects */
2012 typedef struct {
2013 char *label;
2014 atomic_t *counter;
2015 } sctp_dbg_objcnt_entry_t;
2016
2017 #endif /* __sctp_structs_h__ */
2018