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1da177e4 LT |
1 | /* SCTP kernel reference 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 reference Implementation | |
8 | * | |
9 | * The SCTP reference 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 | * The SCTP reference 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 | ||
68 | /* A convenience structure for handling sockaddr structures. | |
69 | * We should wean ourselves off this. | |
70 | */ | |
71 | union sctp_addr { | |
72 | struct sockaddr_in v4; | |
73 | struct sockaddr_in6 v6; | |
74 | struct sockaddr sa; | |
75 | }; | |
76 | ||
77 | /* Forward declarations for data structures. */ | |
78 | struct sctp_globals; | |
79 | struct sctp_endpoint; | |
80 | struct sctp_association; | |
81 | struct sctp_transport; | |
82 | struct sctp_packet; | |
83 | struct sctp_chunk; | |
84 | struct sctp_inq; | |
85 | struct sctp_outq; | |
86 | struct sctp_bind_addr; | |
87 | struct sctp_ulpq; | |
88 | struct sctp_ep_common; | |
89 | struct sctp_ssnmap; | |
90 | ||
91 | ||
92 | #include <net/sctp/tsnmap.h> | |
93 | #include <net/sctp/ulpevent.h> | |
94 | #include <net/sctp/ulpqueue.h> | |
95 | ||
96 | /* Structures useful for managing bind/connect. */ | |
97 | ||
98 | struct sctp_bind_bucket { | |
99 | unsigned short port; | |
100 | unsigned short fastreuse; | |
101 | struct sctp_bind_bucket *next; | |
102 | struct sctp_bind_bucket **pprev; | |
103 | struct hlist_head owner; | |
104 | }; | |
105 | ||
106 | struct sctp_bind_hashbucket { | |
107 | spinlock_t lock; | |
108 | struct sctp_bind_bucket *chain; | |
109 | }; | |
110 | ||
111 | /* Used for hashing all associations. */ | |
112 | struct sctp_hashbucket { | |
113 | rwlock_t lock; | |
114 | struct sctp_ep_common *chain; | |
115 | } __attribute__((__aligned__(8))); | |
116 | ||
117 | ||
118 | /* The SCTP globals structure. */ | |
119 | extern struct sctp_globals { | |
120 | /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values | |
121 | * | |
122 | * The following protocol parameters are RECOMMENDED: | |
123 | * | |
124 | * RTO.Initial - 3 seconds | |
125 | * RTO.Min - 1 second | |
126 | * RTO.Max - 60 seconds | |
127 | * RTO.Alpha - 1/8 (3 when converted to right shifts.) | |
128 | * RTO.Beta - 1/4 (2 when converted to right shifts.) | |
129 | */ | |
130 | __u32 rto_initial; | |
131 | __u32 rto_min; | |
132 | __u32 rto_max; | |
133 | ||
134 | /* Note: rto_alpha and rto_beta are really defined as inverse | |
135 | * powers of two to facilitate integer operations. | |
136 | */ | |
137 | int rto_alpha; | |
138 | int rto_beta; | |
139 | ||
140 | /* Max.Burst - 4 */ | |
141 | int max_burst; | |
142 | ||
143 | /* Valid.Cookie.Life - 60 seconds */ | |
144 | int valid_cookie_life; | |
145 | ||
146 | /* Whether Cookie Preservative is enabled(1) or not(0) */ | |
147 | int cookie_preserve_enable; | |
148 | ||
149 | /* Association.Max.Retrans - 10 attempts | |
150 | * Path.Max.Retrans - 5 attempts (per destination address) | |
151 | * Max.Init.Retransmits - 8 attempts | |
152 | */ | |
153 | int max_retrans_association; | |
154 | int max_retrans_path; | |
155 | int max_retrans_init; | |
156 | ||
4eb701df NH |
157 | /* |
158 | * Policy for preforming sctp/socket accounting | |
159 | * 0 - do socket level accounting, all assocs share sk_sndbuf | |
160 | * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes | |
161 | */ | |
162 | int sndbuf_policy; | |
163 | ||
049b3ff5 NH |
164 | /* |
165 | * Policy for preforming sctp/socket accounting | |
166 | * 0 - do socket level accounting, all assocs share sk_rcvbuf | |
167 | * 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes | |
168 | */ | |
169 | int rcvbuf_policy; | |
170 | ||
2f85a429 VY |
171 | /* Delayed SACK timeout 200ms default*/ |
172 | int sack_timeout; | |
173 | ||
1da177e4 LT |
174 | /* HB.interval - 30 seconds */ |
175 | int hb_interval; | |
176 | ||
177 | /* The following variables are implementation specific. */ | |
178 | ||
179 | /* Default initialization values to be applied to new associations. */ | |
180 | __u16 max_instreams; | |
181 | __u16 max_outstreams; | |
182 | ||
183 | /* This is a list of groups of functions for each address | |
184 | * family that we support. | |
185 | */ | |
186 | struct list_head address_families; | |
187 | ||
188 | /* This is the hash of all endpoints. */ | |
189 | int ep_hashsize; | |
190 | struct sctp_hashbucket *ep_hashtable; | |
191 | ||
192 | /* This is the hash of all associations. */ | |
193 | int assoc_hashsize; | |
194 | struct sctp_hashbucket *assoc_hashtable; | |
195 | ||
196 | /* This is the sctp port control hash. */ | |
197 | int port_hashsize; | |
198 | int port_rover; | |
199 | spinlock_t port_alloc_lock; /* Protects port_rover. */ | |
200 | struct sctp_bind_hashbucket *port_hashtable; | |
201 | ||
202 | /* This is the global local address list. | |
203 | * We actively maintain this complete list of interfaces on | |
204 | * the system by catching routing events. | |
205 | * | |
206 | * It is a list of sctp_sockaddr_entry. | |
207 | */ | |
208 | struct list_head local_addr_list; | |
209 | spinlock_t local_addr_lock; | |
210 | ||
211 | /* Flag to indicate if addip is enabled. */ | |
212 | int addip_enable; | |
213 | ||
214 | /* Flag to indicate if PR-SCTP is enabled. */ | |
215 | int prsctp_enable; | |
216 | } sctp_globals; | |
217 | ||
218 | #define sctp_rto_initial (sctp_globals.rto_initial) | |
219 | #define sctp_rto_min (sctp_globals.rto_min) | |
220 | #define sctp_rto_max (sctp_globals.rto_max) | |
221 | #define sctp_rto_alpha (sctp_globals.rto_alpha) | |
222 | #define sctp_rto_beta (sctp_globals.rto_beta) | |
223 | #define sctp_max_burst (sctp_globals.max_burst) | |
224 | #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) | |
225 | #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) | |
226 | #define sctp_max_retrans_association (sctp_globals.max_retrans_association) | |
4eb701df | 227 | #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) |
049b3ff5 | 228 | #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) |
1da177e4 LT |
229 | #define sctp_max_retrans_path (sctp_globals.max_retrans_path) |
230 | #define sctp_max_retrans_init (sctp_globals.max_retrans_init) | |
2f85a429 | 231 | #define sctp_sack_timeout (sctp_globals.sack_timeout) |
1da177e4 LT |
232 | #define sctp_hb_interval (sctp_globals.hb_interval) |
233 | #define sctp_max_instreams (sctp_globals.max_instreams) | |
234 | #define sctp_max_outstreams (sctp_globals.max_outstreams) | |
235 | #define sctp_address_families (sctp_globals.address_families) | |
236 | #define sctp_ep_hashsize (sctp_globals.ep_hashsize) | |
237 | #define sctp_ep_hashtable (sctp_globals.ep_hashtable) | |
238 | #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) | |
239 | #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) | |
240 | #define sctp_port_hashsize (sctp_globals.port_hashsize) | |
241 | #define sctp_port_rover (sctp_globals.port_rover) | |
242 | #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) | |
243 | #define sctp_port_hashtable (sctp_globals.port_hashtable) | |
244 | #define sctp_local_addr_list (sctp_globals.local_addr_list) | |
245 | #define sctp_local_addr_lock (sctp_globals.local_addr_lock) | |
246 | #define sctp_addip_enable (sctp_globals.addip_enable) | |
247 | #define sctp_prsctp_enable (sctp_globals.prsctp_enable) | |
248 | ||
249 | /* SCTP Socket type: UDP or TCP style. */ | |
250 | typedef enum { | |
251 | SCTP_SOCKET_UDP = 0, | |
252 | SCTP_SOCKET_UDP_HIGH_BANDWIDTH, | |
253 | SCTP_SOCKET_TCP | |
254 | } sctp_socket_type_t; | |
255 | ||
256 | /* Per socket SCTP information. */ | |
257 | struct sctp_sock { | |
258 | /* inet_sock has to be the first member of sctp_sock */ | |
259 | struct inet_sock inet; | |
260 | /* What kind of a socket is this? */ | |
261 | sctp_socket_type_t type; | |
262 | ||
263 | /* PF_ family specific functions. */ | |
264 | struct sctp_pf *pf; | |
265 | ||
266 | /* Access to HMAC transform. */ | |
267 | struct crypto_tfm *hmac; | |
268 | ||
269 | /* What is our base endpointer? */ | |
270 | struct sctp_endpoint *ep; | |
271 | ||
272 | struct sctp_bind_bucket *bind_hash; | |
273 | /* Various Socket Options. */ | |
274 | __u16 default_stream; | |
275 | __u32 default_ppid; | |
276 | __u16 default_flags; | |
277 | __u32 default_context; | |
278 | __u32 default_timetolive; | |
279 | ||
280 | struct sctp_initmsg initmsg; | |
281 | struct sctp_rtoinfo rtoinfo; | |
282 | struct sctp_paddrparams paddrparam; | |
283 | struct sctp_event_subscribe subscribe; | |
284 | struct sctp_assocparams assocparams; | |
285 | int user_frag; | |
286 | __u32 autoclose; | |
287 | __u8 nodelay; | |
288 | __u8 disable_fragments; | |
289 | __u8 pd_mode; | |
290 | __u8 v4mapped; | |
291 | __u32 adaption_ind; | |
292 | ||
293 | /* Receive to here while partial delivery is in effect. */ | |
294 | struct sk_buff_head pd_lobby; | |
295 | }; | |
296 | ||
297 | static inline struct sctp_sock *sctp_sk(const struct sock *sk) | |
298 | { | |
299 | return (struct sctp_sock *)sk; | |
300 | } | |
301 | ||
302 | static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) | |
303 | { | |
304 | return (struct sock *)sp; | |
305 | } | |
306 | ||
307 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
308 | struct sctp6_sock { | |
309 | struct sctp_sock sctp; | |
310 | struct ipv6_pinfo inet6; | |
311 | }; | |
312 | #endif /* CONFIG_IPV6 */ | |
313 | ||
314 | ||
315 | /* This is our APPLICATION-SPECIFIC state cookie. | |
316 | * THIS IS NOT DICTATED BY THE SPECIFICATION. | |
317 | */ | |
318 | /* These are the parts of an association which we send in the cookie. | |
319 | * Most of these are straight out of: | |
320 | * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) | |
321 | * | |
322 | */ | |
323 | ||
324 | struct sctp_cookie { | |
325 | ||
326 | /* My : Tag expected in every inbound packet and sent | |
327 | * Verification: in the INIT or INIT ACK chunk. | |
328 | * Tag : | |
329 | */ | |
330 | __u32 my_vtag; | |
331 | ||
332 | /* Peer's : Tag expected in every outbound packet except | |
333 | * Verification: in the INIT chunk. | |
334 | * Tag : | |
335 | */ | |
336 | __u32 peer_vtag; | |
337 | ||
338 | /* The rest of these are not from the spec, but really need to | |
339 | * be in the cookie. | |
340 | */ | |
341 | ||
342 | /* My Tie Tag : Assist in discovering a restarting association. */ | |
343 | __u32 my_ttag; | |
344 | ||
345 | /* Peer's Tie Tag: Assist in discovering a restarting association. */ | |
346 | __u32 peer_ttag; | |
347 | ||
348 | /* When does this cookie expire? */ | |
349 | struct timeval expiration; | |
350 | ||
351 | /* Number of inbound/outbound streams which are set | |
352 | * and negotiated during the INIT process. | |
353 | */ | |
354 | __u16 sinit_num_ostreams; | |
355 | __u16 sinit_max_instreams; | |
356 | ||
357 | /* This is the first sequence number I used. */ | |
358 | __u32 initial_tsn; | |
359 | ||
360 | /* This holds the originating address of the INIT packet. */ | |
361 | union sctp_addr peer_addr; | |
362 | ||
363 | /* IG Section 2.35.3 | |
364 | * Include the source port of the INIT-ACK | |
365 | */ | |
366 | __u16 my_port; | |
367 | ||
368 | __u8 prsctp_capable; | |
369 | ||
370 | /* Padding for future use */ | |
371 | __u8 padding; | |
372 | ||
373 | __u32 adaption_ind; | |
374 | ||
375 | ||
376 | /* This is a shim for my peer's INIT packet, followed by | |
377 | * a copy of the raw address list of the association. | |
378 | * The length of the raw address list is saved in the | |
379 | * raw_addr_list_len field, which will be used at the time when | |
380 | * the association TCB is re-constructed from the cookie. | |
381 | */ | |
382 | __u32 raw_addr_list_len; | |
383 | struct sctp_init_chunk peer_init[0]; | |
384 | }; | |
385 | ||
386 | ||
387 | /* The format of our cookie that we send to our peer. */ | |
388 | struct sctp_signed_cookie { | |
389 | __u8 signature[SCTP_SECRET_SIZE]; | |
390 | struct sctp_cookie c; | |
391 | }; | |
392 | ||
393 | /* This is another convenience type to allocate memory for address | |
394 | * params for the maximum size and pass such structures around | |
395 | * internally. | |
396 | */ | |
397 | union sctp_addr_param { | |
398 | struct sctp_ipv4addr_param v4; | |
399 | struct sctp_ipv6addr_param v6; | |
400 | }; | |
401 | ||
402 | /* A convenience type to allow walking through the various | |
403 | * parameters and avoid casting all over the place. | |
404 | */ | |
405 | union sctp_params { | |
406 | void *v; | |
407 | struct sctp_paramhdr *p; | |
408 | struct sctp_cookie_preserve_param *life; | |
409 | struct sctp_hostname_param *dns; | |
410 | struct sctp_cookie_param *cookie; | |
411 | struct sctp_supported_addrs_param *sat; | |
412 | struct sctp_ipv4addr_param *v4; | |
413 | struct sctp_ipv6addr_param *v6; | |
414 | union sctp_addr_param *addr; | |
415 | struct sctp_adaption_ind_param *aind; | |
416 | }; | |
417 | ||
418 | /* RFC 2960. Section 3.3.5 Heartbeat. | |
419 | * Heartbeat Information: variable length | |
420 | * The Sender-specific Heartbeat Info field should normally include | |
421 | * information about the sender's current time when this HEARTBEAT | |
422 | * chunk is sent and the destination transport address to which this | |
423 | * HEARTBEAT is sent (see Section 8.3). | |
424 | */ | |
425 | typedef struct sctp_sender_hb_info { | |
426 | struct sctp_paramhdr param_hdr; | |
427 | union sctp_addr daddr; | |
428 | unsigned long sent_at; | |
429 | } __attribute__((packed)) sctp_sender_hb_info_t; | |
430 | ||
431 | /* | |
432 | * RFC 2960 1.3.2 Sequenced Delivery within Streams | |
433 | * | |
434 | * The term "stream" is used in SCTP to refer to a sequence of user | |
435 | * messages that are to be delivered to the upper-layer protocol in | |
436 | * order with respect to other messages within the same stream. This is | |
437 | * in contrast to its usage in TCP, where it refers to a sequence of | |
438 | * bytes (in this document a byte is assumed to be eight bits). | |
439 | * ... | |
440 | * | |
441 | * This is the structure we use to track both our outbound and inbound | |
442 | * SSN, or Stream Sequence Numbers. | |
443 | */ | |
444 | ||
445 | struct sctp_stream { | |
446 | __u16 *ssn; | |
447 | unsigned int len; | |
448 | }; | |
449 | ||
450 | struct sctp_ssnmap { | |
451 | struct sctp_stream in; | |
452 | struct sctp_stream out; | |
453 | int malloced; | |
454 | }; | |
455 | ||
3182cd84 | 456 | struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, |
dd0fc66f | 457 | gfp_t gfp); |
1da177e4 LT |
458 | void sctp_ssnmap_free(struct sctp_ssnmap *map); |
459 | void sctp_ssnmap_clear(struct sctp_ssnmap *map); | |
460 | ||
461 | /* What is the current SSN number for this stream? */ | |
462 | static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) | |
463 | { | |
464 | return stream->ssn[id]; | |
465 | } | |
466 | ||
467 | /* Return the next SSN number for this stream. */ | |
468 | static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) | |
469 | { | |
470 | return stream->ssn[id]++; | |
471 | } | |
472 | ||
473 | /* Skip over this ssn and all below. */ | |
474 | static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, | |
475 | __u16 ssn) | |
476 | { | |
477 | stream->ssn[id] = ssn+1; | |
478 | } | |
479 | ||
480 | /* | |
481 | * Pointers to address related SCTP functions. | |
482 | * (i.e. things that depend on the address family.) | |
483 | */ | |
484 | struct sctp_af { | |
485 | int (*sctp_xmit) (struct sk_buff *skb, | |
486 | struct sctp_transport *, | |
487 | int ipfragok); | |
488 | int (*setsockopt) (struct sock *sk, | |
489 | int level, | |
490 | int optname, | |
491 | char __user *optval, | |
492 | int optlen); | |
493 | int (*getsockopt) (struct sock *sk, | |
494 | int level, | |
495 | int optname, | |
496 | char __user *optval, | |
497 | int __user *optlen); | |
498 | struct dst_entry *(*get_dst) (struct sctp_association *asoc, | |
499 | union sctp_addr *daddr, | |
500 | union sctp_addr *saddr); | |
501 | void (*get_saddr) (struct sctp_association *asoc, | |
502 | struct dst_entry *dst, | |
503 | union sctp_addr *daddr, | |
504 | union sctp_addr *saddr); | |
505 | void (*copy_addrlist) (struct list_head *, | |
506 | struct net_device *); | |
507 | void (*dst_saddr) (union sctp_addr *saddr, | |
508 | struct dst_entry *dst, | |
509 | unsigned short port); | |
510 | int (*cmp_addr) (const union sctp_addr *addr1, | |
511 | const union sctp_addr *addr2); | |
512 | void (*addr_copy) (union sctp_addr *dst, | |
513 | union sctp_addr *src); | |
514 | void (*from_skb) (union sctp_addr *, | |
515 | struct sk_buff *skb, | |
516 | int saddr); | |
517 | void (*from_sk) (union sctp_addr *, | |
518 | struct sock *sk); | |
519 | void (*to_sk_saddr) (union sctp_addr *, | |
520 | struct sock *sk); | |
521 | void (*to_sk_daddr) (union sctp_addr *, | |
522 | struct sock *sk); | |
523 | void (*from_addr_param) (union sctp_addr *, | |
524 | union sctp_addr_param *, | |
525 | __u16 port, int iif); | |
526 | int (*to_addr_param) (const union sctp_addr *, | |
527 | union sctp_addr_param *); | |
528 | int (*addr_valid) (union sctp_addr *, | |
529 | struct sctp_sock *); | |
530 | sctp_scope_t (*scope) (union sctp_addr *); | |
531 | void (*inaddr_any) (union sctp_addr *, unsigned short); | |
532 | int (*is_any) (const union sctp_addr *); | |
533 | int (*available) (union sctp_addr *, | |
534 | struct sctp_sock *); | |
535 | int (*skb_iif) (const struct sk_buff *sk); | |
536 | int (*is_ce) (const struct sk_buff *sk); | |
537 | void (*seq_dump_addr)(struct seq_file *seq, | |
538 | union sctp_addr *addr); | |
539 | __u16 net_header_len; | |
540 | int sockaddr_len; | |
541 | sa_family_t sa_family; | |
542 | struct list_head list; | |
543 | }; | |
544 | ||
545 | struct sctp_af *sctp_get_af_specific(sa_family_t); | |
546 | int sctp_register_af(struct sctp_af *); | |
547 | ||
548 | /* Protocol family functions. */ | |
549 | struct sctp_pf { | |
550 | void (*event_msgname)(struct sctp_ulpevent *, char *, int *); | |
551 | void (*skb_msgname) (struct sk_buff *, char *, int *); | |
552 | int (*af_supported) (sa_family_t, struct sctp_sock *); | |
553 | int (*cmp_addr) (const union sctp_addr *, | |
554 | const union sctp_addr *, | |
555 | struct sctp_sock *); | |
556 | int (*bind_verify) (struct sctp_sock *, union sctp_addr *); | |
557 | int (*send_verify) (struct sctp_sock *, union sctp_addr *); | |
558 | int (*supported_addrs)(const struct sctp_sock *, __u16 *); | |
559 | struct sock *(*create_accept_sk) (struct sock *sk, | |
560 | struct sctp_association *asoc); | |
561 | void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); | |
562 | struct sctp_af *af; | |
563 | }; | |
564 | ||
565 | ||
566 | /* Structure to track chunk fragments that have been acked, but peer | |
567 | * fragments of the same message have not. | |
568 | */ | |
569 | struct sctp_datamsg { | |
570 | /* Chunks waiting to be submitted to lower layer. */ | |
571 | struct list_head chunks; | |
572 | /* Chunks that have been transmitted. */ | |
573 | struct list_head track; | |
574 | /* Reference counting. */ | |
575 | atomic_t refcnt; | |
576 | /* When is this message no longer interesting to the peer? */ | |
577 | unsigned long expires_at; | |
578 | /* Did the messenge fail to send? */ | |
579 | int send_error; | |
580 | char send_failed; | |
581 | /* Control whether chunks from this message can be abandoned. */ | |
582 | char can_abandon; | |
583 | }; | |
584 | ||
585 | struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, | |
586 | struct sctp_sndrcvinfo *, | |
587 | struct msghdr *, int len); | |
588 | void sctp_datamsg_put(struct sctp_datamsg *); | |
589 | void sctp_datamsg_free(struct sctp_datamsg *); | |
590 | void sctp_datamsg_track(struct sctp_chunk *); | |
591 | void sctp_chunk_fail(struct sctp_chunk *, int error); | |
592 | int sctp_chunk_abandoned(struct sctp_chunk *); | |
593 | ||
1da177e4 LT |
594 | /* RFC2960 1.4 Key Terms |
595 | * | |
596 | * o Chunk: A unit of information within an SCTP packet, consisting of | |
597 | * a chunk header and chunk-specific content. | |
598 | * | |
599 | * As a matter of convenience, we remember the SCTP common header for | |
600 | * each chunk as well as a few other header pointers... | |
601 | */ | |
602 | struct sctp_chunk { | |
79af02c2 DM |
603 | struct list_head list; |
604 | ||
1da177e4 LT |
605 | atomic_t refcnt; |
606 | ||
607 | /* This is our link to the per-transport transmitted list. */ | |
608 | struct list_head transmitted_list; | |
609 | ||
610 | /* This field is used by chunks that hold fragmented data. | |
611 | * For the first fragment this is the list that holds the rest of | |
612 | * fragments. For the remaining fragments, this is the link to the | |
613 | * frag_list maintained in the first fragment. | |
614 | */ | |
615 | struct list_head frag_list; | |
616 | ||
617 | /* This points to the sk_buff containing the actual data. */ | |
618 | struct sk_buff *skb; | |
619 | ||
620 | /* These are the SCTP headers by reverse order in a packet. | |
621 | * Note that some of these may happen more than once. In that | |
622 | * case, we point at the "current" one, whatever that means | |
623 | * for that level of header. | |
624 | */ | |
625 | ||
626 | /* We point this at the FIRST TLV parameter to chunk_hdr. */ | |
627 | union sctp_params param_hdr; | |
628 | union { | |
629 | __u8 *v; | |
630 | struct sctp_datahdr *data_hdr; | |
631 | struct sctp_inithdr *init_hdr; | |
632 | struct sctp_sackhdr *sack_hdr; | |
633 | struct sctp_heartbeathdr *hb_hdr; | |
634 | struct sctp_sender_hb_info *hbs_hdr; | |
635 | struct sctp_shutdownhdr *shutdown_hdr; | |
636 | struct sctp_signed_cookie *cookie_hdr; | |
637 | struct sctp_ecnehdr *ecne_hdr; | |
638 | struct sctp_cwrhdr *ecn_cwr_hdr; | |
639 | struct sctp_errhdr *err_hdr; | |
640 | struct sctp_addiphdr *addip_hdr; | |
641 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; | |
642 | } subh; | |
643 | ||
644 | __u8 *chunk_end; | |
645 | ||
646 | struct sctp_chunkhdr *chunk_hdr; | |
647 | struct sctphdr *sctp_hdr; | |
648 | ||
649 | /* This needs to be recoverable for SCTP_SEND_FAILED events. */ | |
650 | struct sctp_sndrcvinfo sinfo; | |
651 | ||
652 | /* Which association does this belong to? */ | |
653 | struct sctp_association *asoc; | |
654 | ||
655 | /* What endpoint received this chunk? */ | |
656 | struct sctp_ep_common *rcvr; | |
657 | ||
658 | /* We fill this in if we are calculating RTT. */ | |
659 | unsigned long sent_at; | |
660 | ||
661 | /* What is the origin IP address for this chunk? */ | |
662 | union sctp_addr source; | |
663 | /* Destination address for this chunk. */ | |
664 | union sctp_addr dest; | |
665 | ||
666 | /* For outbound message, track all fragments for SEND_FAILED. */ | |
667 | struct sctp_datamsg *msg; | |
668 | ||
669 | /* For an inbound chunk, this tells us where it came from. | |
670 | * For an outbound chunk, it tells us where we'd like it to | |
671 | * go. It is NULL if we have no preference. | |
672 | */ | |
673 | struct sctp_transport *transport; | |
674 | ||
675 | __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ | |
676 | __u8 resent; /* Has this chunk ever been retransmitted. */ | |
677 | __u8 has_tsn; /* Does this chunk have a TSN yet? */ | |
678 | __u8 has_ssn; /* Does this chunk have a SSN yet? */ | |
679 | __u8 singleton; /* Was this the only chunk in the packet? */ | |
680 | __u8 end_of_packet; /* Was this the last chunk in the packet? */ | |
681 | __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ | |
682 | __u8 pdiscard; /* Discard the whole packet now? */ | |
683 | __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ | |
684 | __u8 fast_retransmit; /* Is this chunk fast retransmitted? */ | |
685 | __u8 tsn_missing_report; /* Data chunk missing counter. */ | |
686 | }; | |
687 | ||
688 | void sctp_chunk_hold(struct sctp_chunk *); | |
689 | void sctp_chunk_put(struct sctp_chunk *); | |
690 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, | |
691 | struct iovec *data); | |
692 | void sctp_chunk_free(struct sctp_chunk *); | |
693 | void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); | |
694 | struct sctp_chunk *sctp_chunkify(struct sk_buff *, | |
695 | const struct sctp_association *, | |
696 | struct sock *); | |
697 | void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, | |
698 | union sctp_addr *); | |
699 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); | |
700 | ||
701 | /* This is a structure for holding either an IPv6 or an IPv4 address. */ | |
702 | /* sin_family -- AF_INET or AF_INET6 | |
703 | * sin_port -- ordinary port number | |
704 | * sin_addr -- cast to either (struct in_addr) or (struct in6_addr) | |
705 | */ | |
706 | struct sctp_sockaddr_entry { | |
707 | struct list_head list; | |
708 | union sctp_addr a; | |
709 | }; | |
710 | ||
711 | typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); | |
712 | ||
713 | /* This structure holds lists of chunks as we are assembling for | |
714 | * transmission. | |
715 | */ | |
716 | struct sctp_packet { | |
717 | /* These are the SCTP header values (host order) for the packet. */ | |
718 | __u16 source_port; | |
719 | __u16 destination_port; | |
720 | __u32 vtag; | |
721 | ||
722 | /* This contains the payload chunks. */ | |
79af02c2 | 723 | struct list_head chunk_list; |
1da177e4 LT |
724 | |
725 | /* This is the overhead of the sctp and ip headers. */ | |
726 | size_t overhead; | |
727 | /* This is the total size of all chunks INCLUDING padding. */ | |
728 | size_t size; | |
729 | ||
730 | /* The packet is destined for this transport address. | |
731 | * The function we finally use to pass down to the next lower | |
732 | * layer lives in the transport structure. | |
733 | */ | |
734 | struct sctp_transport *transport; | |
735 | ||
736 | /* This packet contains a COOKIE-ECHO chunk. */ | |
737 | char has_cookie_echo; | |
738 | ||
739 | /* This packet containsa SACK chunk. */ | |
740 | char has_sack; | |
741 | ||
742 | /* SCTP cannot fragment this packet. So let ip fragment it. */ | |
743 | char ipfragok; | |
744 | ||
745 | int malloced; | |
746 | }; | |
747 | ||
748 | struct sctp_packet *sctp_packet_init(struct sctp_packet *, | |
749 | struct sctp_transport *, | |
750 | __u16 sport, __u16 dport); | |
751 | struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); | |
752 | sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, | |
753 | struct sctp_chunk *); | |
754 | sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, | |
755 | struct sctp_chunk *); | |
756 | int sctp_packet_transmit(struct sctp_packet *); | |
757 | void sctp_packet_free(struct sctp_packet *); | |
758 | ||
759 | static inline int sctp_packet_empty(struct sctp_packet *packet) | |
760 | { | |
761 | return (packet->size == packet->overhead); | |
762 | } | |
763 | ||
764 | /* This represents a remote transport address. | |
765 | * For local transport addresses, we just use union sctp_addr. | |
766 | * | |
767 | * RFC2960 Section 1.4 Key Terms | |
768 | * | |
769 | * o Transport address: A Transport Address is traditionally defined | |
770 | * by Network Layer address, Transport Layer protocol and Transport | |
771 | * Layer port number. In the case of SCTP running over IP, a | |
772 | * transport address is defined by the combination of an IP address | |
773 | * and an SCTP port number (where SCTP is the Transport protocol). | |
774 | * | |
775 | * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control | |
776 | * | |
777 | * o The sender keeps a separate congestion control parameter set for | |
778 | * each of the destination addresses it can send to (not each | |
779 | * source-destination pair but for each destination). The parameters | |
780 | * should decay if the address is not used for a long enough time | |
781 | * period. | |
782 | * | |
783 | */ | |
784 | struct sctp_transport { | |
785 | /* A list of transports. */ | |
786 | struct list_head transports; | |
787 | ||
788 | /* Reference counting. */ | |
789 | atomic_t refcnt; | |
790 | int dead; | |
791 | ||
792 | /* This is the peer's IP address and port. */ | |
793 | union sctp_addr ipaddr; | |
794 | ||
795 | /* These are the functions we call to handle LLP stuff. */ | |
796 | struct sctp_af *af_specific; | |
797 | ||
798 | /* Which association do we belong to? */ | |
799 | struct sctp_association *asoc; | |
800 | ||
801 | /* RFC2960 | |
802 | * | |
803 | * 12.3 Per Transport Address Data | |
804 | * | |
805 | * For each destination transport address in the peer's | |
806 | * address list derived from the INIT or INIT ACK chunk, a | |
807 | * number of data elements needs to be maintained including: | |
808 | */ | |
809 | __u32 rtt; /* This is the most recent RTT. */ | |
810 | ||
811 | /* RTO : The current retransmission timeout value. */ | |
812 | __u32 rto; | |
813 | ||
814 | /* RTTVAR : The current RTT variation. */ | |
815 | __u32 rttvar; | |
816 | ||
817 | /* SRTT : The current smoothed round trip time. */ | |
818 | __u32 srtt; | |
819 | ||
820 | /* RTO-Pending : A flag used to track if one of the DATA | |
821 | * chunks sent to this address is currently being | |
822 | * used to compute a RTT. If this flag is 0, | |
823 | * the next DATA chunk sent to this destination | |
824 | * should be used to compute a RTT and this flag | |
825 | * should be set. Every time the RTT | |
826 | * calculation completes (i.e. the DATA chunk | |
827 | * is SACK'd) clear this flag. | |
828 | */ | |
829 | int rto_pending; | |
830 | ||
831 | /* | |
832 | * These are the congestion stats. | |
833 | */ | |
834 | /* cwnd : The current congestion window. */ | |
835 | __u32 cwnd; /* This is the actual cwnd. */ | |
836 | ||
837 | /* ssthresh : The current slow start threshold value. */ | |
838 | __u32 ssthresh; | |
839 | ||
840 | /* partial : The tracking method for increase of cwnd when in | |
841 | * bytes acked : congestion avoidance mode (see Section 6.2.2) | |
842 | */ | |
843 | __u32 partial_bytes_acked; | |
844 | ||
845 | /* Data that has been sent, but not acknowledged. */ | |
846 | __u32 flight_size; | |
847 | ||
848 | /* PMTU : The current known path MTU. */ | |
849 | __u32 pmtu; | |
850 | ||
851 | /* Destination */ | |
852 | struct dst_entry *dst; | |
853 | /* Source address. */ | |
854 | union sctp_addr saddr; | |
855 | ||
856 | /* When was the last time(in jiffies) that a data packet was sent on | |
857 | * this transport? This is used to adjust the cwnd when the transport | |
858 | * becomes inactive. | |
859 | */ | |
860 | unsigned long last_time_used; | |
861 | ||
862 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to | |
863 | * the destination address every heartbeat interval. | |
864 | */ | |
865 | int hb_interval; | |
866 | ||
867 | /* When was the last time (in jiffies) that we heard from this | |
868 | * transport? We use this to pick new active and retran paths. | |
869 | */ | |
870 | unsigned long last_time_heard; | |
871 | ||
872 | /* Last time(in jiffies) when cwnd is reduced due to the congestion | |
873 | * indication based on ECNE chunk. | |
874 | */ | |
875 | unsigned long last_time_ecne_reduced; | |
876 | ||
3f7a87d2 FF |
877 | /* The number of times INIT has been sent on this transport. */ |
878 | int init_sent_count; | |
879 | ||
880 | /* state : The current state of this destination, | |
881 | * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. | |
1da177e4 | 882 | */ |
3f7a87d2 | 883 | int state; |
1da177e4 LT |
884 | |
885 | /* hb_allowed : The current heartbeat state of this destination, | |
886 | * : i.e. ALLOW-HB, NO-HEARTBEAT, etc. | |
887 | */ | |
888 | int hb_allowed; | |
889 | ||
890 | /* These are the error stats for this destination. */ | |
891 | ||
892 | /* Error count : The current error count for this destination. */ | |
893 | unsigned short error_count; | |
894 | ||
895 | /* This is the max_retrans value for the transport and will | |
896 | * be initialized to proto.max_retrans.path. This can be changed | |
897 | * using SCTP_SET_PEER_ADDR_PARAMS socket option. | |
898 | */ | |
899 | int max_retrans; | |
900 | ||
901 | /* Per : A timer used by each destination. | |
902 | * Destination : | |
903 | * Timer : | |
904 | * | |
905 | * [Everywhere else in the text this is called T3-rtx. -ed] | |
906 | */ | |
907 | struct timer_list T3_rtx_timer; | |
908 | ||
909 | /* Heartbeat timer is per destination. */ | |
910 | struct timer_list hb_timer; | |
911 | ||
912 | /* Since we're using per-destination retransmission timers | |
913 | * (see above), we're also using per-destination "transmitted" | |
914 | * queues. This probably ought to be a private struct | |
915 | * accessible only within the outqueue, but it's not, yet. | |
916 | */ | |
917 | struct list_head transmitted; | |
918 | ||
919 | /* We build bundle-able packets for this transport here. */ | |
920 | struct sctp_packet packet; | |
921 | ||
922 | /* This is the list of transports that have chunks to send. */ | |
923 | struct list_head send_ready; | |
924 | ||
925 | int malloced; /* Is this structure kfree()able? */ | |
926 | ||
927 | /* State information saved for SFR_CACC algorithm. The key | |
928 | * idea in SFR_CACC is to maintain state at the sender on a | |
929 | * per-destination basis when a changeover happens. | |
930 | * char changeover_active; | |
931 | * char cycling_changeover; | |
932 | * __u32 next_tsn_at_change; | |
933 | * char cacc_saw_newack; | |
934 | */ | |
935 | struct { | |
936 | /* An unsigned integer, which stores the next TSN to be | |
937 | * used by the sender, at the moment of changeover. | |
938 | */ | |
939 | __u32 next_tsn_at_change; | |
940 | ||
941 | /* A flag which indicates the occurrence of a changeover */ | |
942 | char changeover_active; | |
943 | ||
944 | /* A flag which indicates whether the change of primary is | |
945 | * the first switch to this destination address during an | |
946 | * active switch. | |
947 | */ | |
948 | char cycling_changeover; | |
949 | ||
950 | /* A temporary flag, which is used during the processing of | |
951 | * a SACK to estimate the causative TSN(s)'s group. | |
952 | */ | |
953 | char cacc_saw_newack; | |
954 | } cacc; | |
955 | }; | |
956 | ||
3182cd84 | 957 | struct sctp_transport *sctp_transport_new(const union sctp_addr *, |
dd0fc66f | 958 | gfp_t); |
1da177e4 LT |
959 | void sctp_transport_set_owner(struct sctp_transport *, |
960 | struct sctp_association *); | |
961 | void sctp_transport_route(struct sctp_transport *, union sctp_addr *, | |
962 | struct sctp_sock *); | |
963 | void sctp_transport_pmtu(struct sctp_transport *); | |
964 | void sctp_transport_free(struct sctp_transport *); | |
965 | void sctp_transport_reset_timers(struct sctp_transport *); | |
966 | void sctp_transport_hold(struct sctp_transport *); | |
967 | void sctp_transport_put(struct sctp_transport *); | |
968 | void sctp_transport_update_rto(struct sctp_transport *, __u32); | |
969 | void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); | |
970 | void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); | |
971 | unsigned long sctp_transport_timeout(struct sctp_transport *); | |
972 | ||
973 | ||
974 | /* This is the structure we use to queue packets as they come into | |
975 | * SCTP. We write packets to it and read chunks from it. | |
976 | */ | |
977 | struct sctp_inq { | |
978 | /* This is actually a queue of sctp_chunk each | |
979 | * containing a partially decoded packet. | |
980 | */ | |
79af02c2 | 981 | struct list_head in_chunk_list; |
1da177e4 LT |
982 | /* This is the packet which is currently off the in queue and is |
983 | * being worked on through the inbound chunk processing. | |
984 | */ | |
985 | struct sctp_chunk *in_progress; | |
986 | ||
987 | /* This is the delayed task to finish delivering inbound | |
988 | * messages. | |
989 | */ | |
990 | struct work_struct immediate; | |
991 | ||
992 | int malloced; /* Is this structure kfree()able? */ | |
993 | }; | |
994 | ||
995 | void sctp_inq_init(struct sctp_inq *); | |
996 | void sctp_inq_free(struct sctp_inq *); | |
997 | void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); | |
998 | struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); | |
999 | void sctp_inq_set_th_handler(struct sctp_inq *, void (*)(void *), void *); | |
1000 | ||
1001 | /* This is the structure we use to hold outbound chunks. You push | |
1002 | * chunks in and they automatically pop out the other end as bundled | |
1003 | * packets (it calls (*output_handler)()). | |
1004 | * | |
1005 | * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, | |
1006 | * and 8.2 of the v13 draft. | |
1007 | * | |
1008 | * It handles retransmissions. The connection to the timeout portion | |
1009 | * of the state machine is through sctp_..._timeout() and timeout_handler. | |
1010 | * | |
1011 | * If you feed it SACKs, it will eat them. | |
1012 | * | |
1013 | * If you give it big chunks, it will fragment them. | |
1014 | * | |
1015 | * It assigns TSN's to data chunks. This happens at the last possible | |
1016 | * instant before transmission. | |
1017 | * | |
1018 | * When free()'d, it empties itself out via output_handler(). | |
1019 | */ | |
1020 | struct sctp_outq { | |
1021 | struct sctp_association *asoc; | |
1022 | ||
1023 | /* Data pending that has never been transmitted. */ | |
79af02c2 | 1024 | struct list_head out_chunk_list; |
1da177e4 LT |
1025 | |
1026 | unsigned out_qlen; /* Total length of queued data chunks. */ | |
1027 | ||
1028 | /* Error of send failed, may used in SCTP_SEND_FAILED event. */ | |
1029 | unsigned error; | |
1030 | ||
1031 | /* These are control chunks we want to send. */ | |
79af02c2 | 1032 | struct list_head control_chunk_list; |
1da177e4 LT |
1033 | |
1034 | /* These are chunks that have been sacked but are above the | |
1035 | * CTSN, or cumulative tsn ack point. | |
1036 | */ | |
1037 | struct list_head sacked; | |
1038 | ||
1039 | /* Put chunks on this list to schedule them for | |
1040 | * retransmission. | |
1041 | */ | |
1042 | struct list_head retransmit; | |
1043 | ||
1044 | /* Put chunks on this list to save them for FWD TSN processing as | |
1045 | * they were abandoned. | |
1046 | */ | |
1047 | struct list_head abandoned; | |
1048 | ||
1049 | /* How many unackd bytes do we have in-flight? */ | |
1050 | __u32 outstanding_bytes; | |
1051 | ||
1052 | /* Corked? */ | |
1053 | char cork; | |
1054 | ||
1055 | /* Is this structure empty? */ | |
1056 | char empty; | |
1057 | ||
1058 | /* Are we kfree()able? */ | |
1059 | char malloced; | |
1060 | }; | |
1061 | ||
1062 | void sctp_outq_init(struct sctp_association *, struct sctp_outq *); | |
1063 | void sctp_outq_teardown(struct sctp_outq *); | |
1064 | void sctp_outq_free(struct sctp_outq*); | |
1065 | int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); | |
1066 | int sctp_outq_flush(struct sctp_outq *, int); | |
1067 | int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); | |
1068 | int sctp_outq_is_empty(const struct sctp_outq *); | |
1069 | void sctp_outq_restart(struct sctp_outq *); | |
1070 | ||
1071 | void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, | |
1072 | sctp_retransmit_reason_t); | |
1073 | void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); | |
1074 | int sctp_outq_uncork(struct sctp_outq *); | |
1075 | /* Uncork and flush an outqueue. */ | |
1076 | static inline void sctp_outq_cork(struct sctp_outq *q) | |
1077 | { | |
1078 | q->cork = 1; | |
1079 | } | |
1080 | ||
1081 | /* These bind address data fields common between endpoints and associations */ | |
1082 | struct sctp_bind_addr { | |
1083 | ||
1084 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance | |
1085 | * | |
1086 | * SCTP Port: The local SCTP port number the endpoint is | |
1087 | * bound to. | |
1088 | */ | |
1089 | __u16 port; | |
1090 | ||
1091 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance | |
1092 | * | |
1093 | * Address List: The list of IP addresses that this instance | |
1094 | * has bound. This information is passed to one's | |
1095 | * peer(s) in INIT and INIT ACK chunks. | |
1096 | */ | |
1097 | struct list_head address_list; | |
1098 | ||
1099 | int malloced; /* Are we kfree()able? */ | |
1100 | }; | |
1101 | ||
1102 | void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); | |
1103 | void sctp_bind_addr_free(struct sctp_bind_addr *); | |
1104 | int sctp_bind_addr_copy(struct sctp_bind_addr *dest, | |
1105 | const struct sctp_bind_addr *src, | |
dd0fc66f | 1106 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 1107 | int flags); |
1da177e4 | 1108 | int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, |
dd0fc66f | 1109 | gfp_t gfp); |
1da177e4 LT |
1110 | int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); |
1111 | int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, | |
1112 | struct sctp_sock *); | |
1113 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, | |
1114 | const union sctp_addr *addrs, | |
1115 | int addrcnt, | |
1116 | struct sctp_sock *opt); | |
1117 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 1118 | int *addrs_len, |
dd0fc66f | 1119 | gfp_t gfp); |
1da177e4 | 1120 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, |
dd0fc66f | 1121 | __u16 port, gfp_t gfp); |
1da177e4 LT |
1122 | |
1123 | sctp_scope_t sctp_scope(const union sctp_addr *); | |
1124 | int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); | |
1125 | int sctp_is_any(const union sctp_addr *addr); | |
1126 | int sctp_addr_is_valid(const union sctp_addr *addr); | |
1127 | ||
1128 | ||
1129 | /* What type of endpoint? */ | |
1130 | typedef enum { | |
1131 | SCTP_EP_TYPE_SOCKET, | |
1132 | SCTP_EP_TYPE_ASSOCIATION, | |
1133 | } sctp_endpoint_type_t; | |
1134 | ||
1135 | /* | |
1136 | * A common base class to bridge the implmentation view of a | |
1137 | * socket (usually listening) endpoint versus an association's | |
1138 | * local endpoint. | |
1139 | * This common structure is useful for several purposes: | |
1140 | * 1) Common interface for lookup routines. | |
1141 | * a) Subfunctions work for either endpoint or association | |
1142 | * b) Single interface to lookup allows hiding the lookup lock rather | |
1143 | * than acquiring it externally. | |
1144 | * 2) Common interface for the inbound chunk handling/state machine. | |
1145 | * 3) Common object handling routines for reference counting, etc. | |
1146 | * 4) Disentangle association lookup from endpoint lookup, where we | |
1147 | * do not have to find our endpoint to find our association. | |
1148 | * | |
1149 | */ | |
1150 | ||
1151 | struct sctp_ep_common { | |
1152 | /* Fields to help us manage our entries in the hash tables. */ | |
1153 | struct sctp_ep_common *next; | |
1154 | struct sctp_ep_common **pprev; | |
1155 | int hashent; | |
1156 | ||
1157 | /* Runtime type information. What kind of endpoint is this? */ | |
1158 | sctp_endpoint_type_t type; | |
1159 | ||
1160 | /* Some fields to help us manage this object. | |
1161 | * refcnt - Reference count access to this object. | |
1162 | * dead - Do not attempt to use this object. | |
1163 | * malloced - Do we need to kfree this object? | |
1164 | */ | |
1165 | atomic_t refcnt; | |
1166 | char dead; | |
1167 | char malloced; | |
1168 | ||
1169 | /* What socket does this endpoint belong to? */ | |
1170 | struct sock *sk; | |
1171 | ||
1172 | /* This is where we receive inbound chunks. */ | |
1173 | struct sctp_inq inqueue; | |
1174 | ||
1175 | /* This substructure includes the defining parameters of the | |
1176 | * endpoint: | |
1177 | * bind_addr.port is our shared port number. | |
1178 | * bind_addr.address_list is our set of local IP addresses. | |
1179 | */ | |
1180 | struct sctp_bind_addr bind_addr; | |
1181 | ||
1182 | /* Protection during address list comparisons. */ | |
1183 | rwlock_t addr_lock; | |
1184 | }; | |
1185 | ||
1186 | ||
1187 | /* RFC Section 1.4 Key Terms | |
1188 | * | |
1189 | * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a | |
1190 | * multi-homed host, an SCTP endpoint is represented to its peers as a | |
1191 | * combination of a set of eligible destination transport addresses to | |
1192 | * which SCTP packets can be sent and a set of eligible source | |
1193 | * transport addresses from which SCTP packets can be received. | |
1194 | * All transport addresses used by an SCTP endpoint must use the | |
1195 | * same port number, but can use multiple IP addresses. A transport | |
1196 | * address used by an SCTP endpoint must not be used by another | |
1197 | * SCTP endpoint. In other words, a transport address is unique | |
1198 | * to an SCTP endpoint. | |
1199 | * | |
1200 | * From an implementation perspective, each socket has one of these. | |
1201 | * A TCP-style socket will have exactly one association on one of | |
1202 | * these. An UDP-style socket will have multiple associations hanging | |
1203 | * off one of these. | |
1204 | */ | |
1205 | ||
1206 | struct sctp_endpoint { | |
1207 | /* Common substructure for endpoint and association. */ | |
1208 | struct sctp_ep_common base; | |
1209 | ||
1210 | /* Associations: A list of current associations and mappings | |
1211 | * to the data consumers for each association. This | |
1212 | * may be in the form of a hash table or other | |
1213 | * implementation dependent structure. The data | |
1214 | * consumers may be process identification | |
1215 | * information such as file descriptors, named pipe | |
1216 | * pointer, or table pointers dependent on how SCTP | |
1217 | * is implemented. | |
1218 | */ | |
1219 | /* This is really a list of struct sctp_association entries. */ | |
1220 | struct list_head asocs; | |
1221 | ||
1222 | /* Secret Key: A secret key used by this endpoint to compute | |
1223 | * the MAC. This SHOULD be a cryptographic quality | |
1224 | * random number with a sufficient length. | |
1225 | * Discussion in [RFC1750] can be helpful in | |
1226 | * selection of the key. | |
1227 | */ | |
1228 | __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; | |
1229 | int current_key; | |
1230 | int last_key; | |
1231 | int key_changed_at; | |
1232 | ||
4eb701df NH |
1233 | /* sendbuf acct. policy. */ |
1234 | __u32 sndbuf_policy; | |
049b3ff5 NH |
1235 | |
1236 | /* rcvbuf acct. policy. */ | |
1237 | __u32 rcvbuf_policy; | |
1da177e4 LT |
1238 | }; |
1239 | ||
1240 | /* Recover the outter endpoint structure. */ | |
1241 | static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) | |
1242 | { | |
1243 | struct sctp_endpoint *ep; | |
1244 | ||
1245 | ep = container_of(base, struct sctp_endpoint, base); | |
1246 | return ep; | |
1247 | } | |
1248 | ||
1249 | /* These are function signatures for manipulating endpoints. */ | |
dd0fc66f | 1250 | struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); |
1da177e4 LT |
1251 | void sctp_endpoint_free(struct sctp_endpoint *); |
1252 | void sctp_endpoint_put(struct sctp_endpoint *); | |
1253 | void sctp_endpoint_hold(struct sctp_endpoint *); | |
1254 | void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); | |
1255 | struct sctp_association *sctp_endpoint_lookup_assoc( | |
1256 | const struct sctp_endpoint *ep, | |
1257 | const union sctp_addr *paddr, | |
1258 | struct sctp_transport **); | |
1259 | int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, | |
1260 | const union sctp_addr *); | |
1261 | struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, | |
1262 | const union sctp_addr *); | |
1263 | int sctp_has_association(const union sctp_addr *laddr, | |
1264 | const union sctp_addr *paddr); | |
1265 | ||
1266 | int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, | |
1267 | sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, | |
1268 | struct sctp_chunk **err_chunk); | |
1269 | int sctp_process_init(struct sctp_association *, sctp_cid_t cid, | |
1270 | const union sctp_addr *peer, | |
dd0fc66f | 1271 | sctp_init_chunk_t *init, gfp_t gfp); |
1da177e4 LT |
1272 | __u32 sctp_generate_tag(const struct sctp_endpoint *); |
1273 | __u32 sctp_generate_tsn(const struct sctp_endpoint *); | |
1274 | ||
1275 | ||
1276 | /* RFC2960 | |
1277 | * | |
1278 | * 12. Recommended Transmission Control Block (TCB) Parameters | |
1279 | * | |
1280 | * This section details a recommended set of parameters that should | |
1281 | * be contained within the TCB for an implementation. This section is | |
1282 | * for illustrative purposes and should not be deemed as requirements | |
1283 | * on an implementation or as an exhaustive list of all parameters | |
1284 | * inside an SCTP TCB. Each implementation may need its own additional | |
1285 | * parameters for optimization. | |
1286 | */ | |
1287 | ||
1288 | ||
1289 | /* Here we have information about each individual association. */ | |
1290 | struct sctp_association { | |
1291 | ||
1292 | /* A base structure common to endpoint and association. | |
1293 | * In this context, it represents the associations's view | |
1294 | * of the local endpoint of the association. | |
1295 | */ | |
1296 | struct sctp_ep_common base; | |
1297 | ||
1298 | /* Associations on the same socket. */ | |
1299 | struct list_head asocs; | |
1300 | ||
1301 | /* association id. */ | |
1302 | sctp_assoc_t assoc_id; | |
1303 | ||
1304 | /* This is our parent endpoint. */ | |
1305 | struct sctp_endpoint *ep; | |
1306 | ||
1307 | /* These are those association elements needed in the cookie. */ | |
1308 | struct sctp_cookie c; | |
1309 | ||
1310 | /* This is all information about our peer. */ | |
1311 | struct { | |
1312 | /* rwnd | |
1313 | * | |
1314 | * Peer Rwnd : Current calculated value of the peer's rwnd. | |
1315 | */ | |
1316 | __u32 rwnd; | |
1317 | ||
1318 | /* transport_addr_list | |
1319 | * | |
1320 | * Peer : A list of SCTP transport addresses that the | |
1321 | * Transport : peer is bound to. This information is derived | |
1322 | * Address : from the INIT or INIT ACK and is used to | |
1323 | * List : associate an inbound packet with a given | |
1324 | * : association. Normally this information is | |
1325 | * : hashed or keyed for quick lookup and access | |
1326 | * : of the TCB. | |
3f7a87d2 FF |
1327 | * : The list is also initialized with the list |
1328 | * : of addresses passed with the sctp_connectx() | |
1329 | * : call. | |
1da177e4 LT |
1330 | * |
1331 | * It is a list of SCTP_transport's. | |
1332 | */ | |
1333 | struct list_head transport_addr_list; | |
1334 | ||
3f7a87d2 FF |
1335 | /* transport_count |
1336 | * | |
1337 | * Peer : A count of the number of peer addresses | |
1338 | * Transport : in the Peer Transport Address List. | |
1339 | * Address : | |
1340 | * Count : | |
1341 | */ | |
1342 | __u16 transport_count; | |
1343 | ||
1da177e4 LT |
1344 | /* port |
1345 | * The transport layer port number. | |
1346 | */ | |
1347 | __u16 port; | |
1348 | ||
1349 | /* primary_path | |
1350 | * | |
1351 | * Primary : This is the current primary destination | |
1352 | * Path : transport address of the peer endpoint. It | |
1353 | * : may also specify a source transport address | |
1354 | * : on this endpoint. | |
1355 | * | |
1356 | * All of these paths live on transport_addr_list. | |
1357 | * | |
1358 | * At the bakeoffs, we discovered that the intent of | |
1359 | * primaryPath is that it only changes when the ULP | |
1360 | * asks to have it changed. We add the activePath to | |
1361 | * designate the connection we are currently using to | |
1362 | * transmit new data and most control chunks. | |
1363 | */ | |
1364 | struct sctp_transport *primary_path; | |
1365 | ||
1366 | /* Cache the primary path address here, when we | |
1367 | * need a an address for msg_name. | |
1368 | */ | |
1369 | union sctp_addr primary_addr; | |
1370 | ||
1371 | /* active_path | |
1372 | * The path that we are currently using to | |
1373 | * transmit new data and most control chunks. | |
1374 | */ | |
1375 | struct sctp_transport *active_path; | |
1376 | ||
1377 | /* retran_path | |
1378 | * | |
1379 | * RFC2960 6.4 Multi-homed SCTP Endpoints | |
1380 | * ... | |
1381 | * Furthermore, when its peer is multi-homed, an | |
1382 | * endpoint SHOULD try to retransmit a chunk to an | |
1383 | * active destination transport address that is | |
1384 | * different from the last destination address to | |
1385 | * which the DATA chunk was sent. | |
1386 | */ | |
1387 | struct sctp_transport *retran_path; | |
1388 | ||
1389 | /* Pointer to last transport I have sent on. */ | |
1390 | struct sctp_transport *last_sent_to; | |
1391 | ||
1392 | /* This is the last transport I have received DATA on. */ | |
1393 | struct sctp_transport *last_data_from; | |
1394 | ||
1395 | /* | |
1396 | * Mapping An array of bits or bytes indicating which out of | |
1397 | * Array order TSN's have been received (relative to the | |
1398 | * Last Rcvd TSN). If no gaps exist, i.e. no out of | |
1399 | * order packets have been received, this array | |
1400 | * will be set to all zero. This structure may be | |
1401 | * in the form of a circular buffer or bit array. | |
1402 | * | |
1403 | * Last Rcvd : This is the last TSN received in | |
1404 | * TSN : sequence. This value is set initially by | |
1405 | * : taking the peer's Initial TSN, received in | |
1406 | * : the INIT or INIT ACK chunk, and subtracting | |
1407 | * : one from it. | |
1408 | * | |
1409 | * Throughout most of the specification this is called the | |
1410 | * "Cumulative TSN ACK Point". In this case, we | |
1411 | * ignore the advice in 12.2 in favour of the term | |
1412 | * used in the bulk of the text. This value is hidden | |
1413 | * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). | |
1414 | */ | |
1415 | struct sctp_tsnmap tsn_map; | |
1416 | __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; | |
1417 | ||
1418 | /* Ack State : This flag indicates if the next received | |
1419 | * : packet is to be responded to with a | |
1420 | * : SACK. This is initializedto 0. When a packet | |
1421 | * : is received it is incremented. If this value | |
1422 | * : reaches 2 or more, a SACK is sent and the | |
1423 | * : value is reset to 0. Note: This is used only | |
1424 | * : when no DATA chunks are received out of | |
1425 | * : order. When DATA chunks are out of order, | |
1426 | * : SACK's are not delayed (see Section 6). | |
1427 | */ | |
1428 | __u8 sack_needed; /* Do we need to sack the peer? */ | |
1429 | ||
1430 | /* These are capabilities which our peer advertised. */ | |
1431 | __u8 ecn_capable; /* Can peer do ECN? */ | |
1432 | __u8 ipv4_address; /* Peer understands IPv4 addresses? */ | |
1433 | __u8 ipv6_address; /* Peer understands IPv6 addresses? */ | |
1434 | __u8 hostname_address;/* Peer understands DNS addresses? */ | |
1435 | __u8 asconf_capable; /* Does peer support ADDIP? */ | |
1436 | __u8 prsctp_capable; /* Can peer do PR-SCTP? */ | |
1437 | ||
1438 | __u32 adaption_ind; /* Adaption Code point. */ | |
1439 | ||
1440 | /* This mask is used to disable sending the ASCONF chunk | |
1441 | * with specified parameter to peer. | |
1442 | */ | |
1443 | __u16 addip_disabled_mask; | |
1444 | ||
1445 | struct sctp_inithdr i; | |
1446 | int cookie_len; | |
1447 | void *cookie; | |
1448 | ||
1449 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. | |
1450 | * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the | |
1451 | * Initial TSN Value minus 1 | |
1452 | */ | |
1453 | __u32 addip_serial; | |
1454 | } peer; | |
1455 | ||
1456 | /* State : A state variable indicating what state the | |
1457 | * : association is in, i.e. COOKIE-WAIT, | |
1458 | * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, | |
1459 | * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. | |
1460 | * | |
1461 | * Note: No "CLOSED" state is illustrated since if a | |
1462 | * association is "CLOSED" its TCB SHOULD be removed. | |
1463 | * | |
1464 | * In this implementation we DO have a CLOSED | |
1465 | * state which is used during initiation and shutdown. | |
1466 | * | |
1467 | * State takes values from SCTP_STATE_*. | |
1468 | */ | |
1469 | sctp_state_t state; | |
1470 | ||
1471 | /* The cookie life I award for any cookie. */ | |
1472 | struct timeval cookie_life; | |
1473 | ||
1474 | /* Overall : The overall association error count. | |
1475 | * Error Count : [Clear this any time I get something.] | |
1476 | */ | |
1477 | int overall_error_count; | |
1478 | ||
1479 | /* These are the association's initial, max, and min RTO values. | |
1480 | * These values will be initialized by system defaults, but can | |
1481 | * be modified via the SCTP_RTOINFO socket option. | |
1482 | */ | |
1483 | __u32 rto_initial; | |
1484 | __u32 rto_max; | |
1485 | __u32 rto_min; | |
1486 | ||
1487 | /* Maximum number of new data packets that can be sent in a burst. */ | |
1488 | int max_burst; | |
1489 | ||
1490 | /* This is the max_retrans value for the association. This value will | |
1491 | * be initialized initialized from system defaults, but can be | |
1492 | * modified by the SCTP_ASSOCINFO socket option. | |
1493 | */ | |
1494 | int max_retrans; | |
1495 | ||
1496 | /* Maximum number of times the endpoint will retransmit INIT */ | |
1497 | __u16 max_init_attempts; | |
1498 | ||
1499 | /* How many times have we resent an INIT? */ | |
1500 | __u16 init_retries; | |
1501 | ||
1502 | /* The largest timeout or RTO value to use in attempting an INIT */ | |
1503 | __u16 max_init_timeo; | |
1504 | ||
1505 | int timeouts[SCTP_NUM_TIMEOUT_TYPES]; | |
1506 | struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; | |
1507 | ||
1508 | /* Transport to which SHUTDOWN chunk was last sent. */ | |
1509 | struct sctp_transport *shutdown_last_sent_to; | |
1510 | ||
3f7a87d2 FF |
1511 | /* Transport to which INIT chunk was last sent. */ |
1512 | struct sctp_transport *init_last_sent_to; | |
1513 | ||
1da177e4 LT |
1514 | /* Next TSN : The next TSN number to be assigned to a new |
1515 | * : DATA chunk. This is sent in the INIT or INIT | |
1516 | * : ACK chunk to the peer and incremented each | |
1517 | * : time a DATA chunk is assigned a TSN | |
1518 | * : (normally just prior to transmit or during | |
1519 | * : fragmentation). | |
1520 | */ | |
1521 | __u32 next_tsn; | |
1522 | ||
1523 | /* | |
1524 | * Last Rcvd : This is the last TSN received in sequence. This value | |
1525 | * TSN : is set initially by taking the peer's Initial TSN, | |
1526 | * : received in the INIT or INIT ACK chunk, and | |
1527 | * : subtracting one from it. | |
1528 | * | |
1529 | * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. | |
1530 | */ | |
1531 | ||
1532 | __u32 ctsn_ack_point; | |
1533 | ||
1534 | /* PR-SCTP Advanced.Peer.Ack.Point */ | |
1535 | __u32 adv_peer_ack_point; | |
1536 | ||
1537 | /* Highest TSN that is acknowledged by incoming SACKs. */ | |
1538 | __u32 highest_sacked; | |
1539 | ||
1540 | /* The number of unacknowledged data chunks. Reported through | |
1541 | * the SCTP_STATUS sockopt. | |
1542 | */ | |
1543 | __u16 unack_data; | |
1544 | ||
1545 | /* This is the association's receive buffer space. This value is used | |
1546 | * to set a_rwnd field in an INIT or a SACK chunk. | |
1547 | */ | |
1548 | __u32 rwnd; | |
1549 | ||
1550 | /* This is the last advertised value of rwnd over a SACK chunk. */ | |
1551 | __u32 a_rwnd; | |
1552 | ||
1553 | /* Number of bytes by which the rwnd has slopped. The rwnd is allowed | |
1554 | * to slop over a maximum of the association's frag_point. | |
1555 | */ | |
1556 | __u32 rwnd_over; | |
1557 | ||
1558 | /* This is the sndbuf size in use for the association. | |
1559 | * This corresponds to the sndbuf size for the association, | |
1560 | * as specified in the sk->sndbuf. | |
1561 | */ | |
1562 | int sndbuf_used; | |
1563 | ||
049b3ff5 NH |
1564 | /* This is the amount of memory that this association has allocated |
1565 | * in the receive path at any given time. | |
1566 | */ | |
1567 | atomic_t rmem_alloc; | |
1568 | ||
1da177e4 LT |
1569 | /* This is the wait queue head for send requests waiting on |
1570 | * the association sndbuf space. | |
1571 | */ | |
1572 | wait_queue_head_t wait; | |
1573 | ||
1574 | /* Association : The smallest PMTU discovered for all of the | |
1575 | * PMTU : peer's transport addresses. | |
1576 | */ | |
1577 | __u32 pmtu; | |
1578 | ||
1579 | /* The message size at which SCTP fragmentation will occur. */ | |
1580 | __u32 frag_point; | |
1581 | ||
3f7a87d2 FF |
1582 | /* Counter used to count INIT errors. */ |
1583 | int init_err_counter; | |
1584 | ||
1585 | /* Count the number of INIT cycles (for doubling timeout). */ | |
1586 | int init_cycle; | |
1da177e4 LT |
1587 | |
1588 | /* Default send parameters. */ | |
1589 | __u16 default_stream; | |
1590 | __u16 default_flags; | |
1591 | __u32 default_ppid; | |
1592 | __u32 default_context; | |
1593 | __u32 default_timetolive; | |
1594 | ||
1595 | /* This tracks outbound ssn for a given stream. */ | |
1596 | struct sctp_ssnmap *ssnmap; | |
1597 | ||
1598 | /* All outbound chunks go through this structure. */ | |
1599 | struct sctp_outq outqueue; | |
1600 | ||
1601 | /* A smart pipe that will handle reordering and fragmentation, | |
1602 | * as well as handle passing events up to the ULP. | |
1603 | */ | |
1604 | struct sctp_ulpq ulpq; | |
1605 | ||
1606 | /* Last TSN that caused an ECNE Chunk to be sent. */ | |
1607 | __u32 last_ecne_tsn; | |
1608 | ||
1609 | /* Last TSN that caused a CWR Chunk to be sent. */ | |
1610 | __u32 last_cwr_tsn; | |
1611 | ||
1612 | /* How many duplicated TSNs have we seen? */ | |
1613 | int numduptsns; | |
1614 | ||
1615 | /* Number of seconds of idle time before an association is closed. */ | |
1616 | __u32 autoclose; | |
1617 | ||
1618 | /* These are to support | |
1619 | * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses | |
1620 | * and Enforcement of Flow and Message Limits" | |
1621 | * <draft-ietf-tsvwg-addip-sctp-02.txt> | |
1622 | * or "ADDIP" for short. | |
1623 | */ | |
1624 | ||
1625 | ||
1626 | ||
1627 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
1628 | * | |
1629 | * R1) One and only one ASCONF Chunk MAY be in transit and | |
1630 | * unacknowledged at any one time. If a sender, after sending | |
1631 | * an ASCONF chunk, decides it needs to transfer another | |
1632 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk | |
1633 | * returns from the previous ASCONF Chunk before sending a | |
1634 | * subsequent ASCONF. Note this restriction binds each side, | |
1635 | * so at any time two ASCONF may be in-transit on any given | |
1636 | * association (one sent from each endpoint). | |
1637 | * | |
1638 | * [This is our one-and-only-one ASCONF in flight. If we do | |
1639 | * not have an ASCONF in flight, this is NULL.] | |
1640 | */ | |
1641 | struct sctp_chunk *addip_last_asconf; | |
1642 | ||
1643 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. | |
1644 | * | |
1645 | * IMPLEMENTATION NOTE: As an optimization a receiver may wish | |
1646 | * to save the last ASCONF-ACK for some predetermined period | |
1647 | * of time and instead of re-processing the ASCONF (with the | |
1648 | * same serial number) it may just re-transmit the | |
1649 | * ASCONF-ACK. It may wish to use the arrival of a new serial | |
1650 | * number to discard the previously saved ASCONF-ACK or any | |
1651 | * other means it may choose to expire the saved ASCONF-ACK. | |
1652 | * | |
1653 | * [This is our saved ASCONF-ACK. We invalidate it when a new | |
1654 | * ASCONF serial number arrives.] | |
1655 | */ | |
1656 | struct sctp_chunk *addip_last_asconf_ack; | |
1657 | ||
1658 | /* These ASCONF chunks are waiting to be sent. | |
1659 | * | |
1660 | * These chunaks can't be pushed to outqueue until receiving | |
1661 | * ASCONF_ACK for the previous ASCONF indicated by | |
1662 | * addip_last_asconf, so as to guarantee that only one ASCONF | |
1663 | * is in flight at any time. | |
1664 | * | |
1665 | * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
1666 | * | |
1667 | * In defining the ASCONF Chunk transfer procedures, it is | |
1668 | * essential that these transfers MUST NOT cause congestion | |
1669 | * within the network. To achieve this, we place these | |
1670 | * restrictions on the transfer of ASCONF Chunks: | |
1671 | * | |
1672 | * R1) One and only one ASCONF Chunk MAY be in transit and | |
1673 | * unacknowledged at any one time. If a sender, after sending | |
1674 | * an ASCONF chunk, decides it needs to transfer another | |
1675 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk | |
1676 | * returns from the previous ASCONF Chunk before sending a | |
1677 | * subsequent ASCONF. Note this restriction binds each side, | |
1678 | * so at any time two ASCONF may be in-transit on any given | |
1679 | * association (one sent from each endpoint). | |
1680 | * | |
1681 | * | |
1682 | * [I really think this is EXACTLY the sort of intelligence | |
1683 | * which already resides in sctp_outq. Please move this | |
1684 | * queue and its supporting logic down there. --piggy] | |
1685 | */ | |
79af02c2 | 1686 | struct list_head addip_chunk_list; |
1da177e4 LT |
1687 | |
1688 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
1689 | * | |
1690 | * A2) A serial number should be assigned to the Chunk. The | |
1691 | * serial number SHOULD be a monotonically increasing | |
1692 | * number. The serial number SHOULD be initialized at | |
1693 | * the start of the association to the same value as the | |
1694 | * Initial TSN and every time a new ASCONF chunk is created | |
1695 | * it is incremented by one after assigning the serial number | |
1696 | * to the newly created chunk. | |
1697 | * | |
1698 | * ADDIP | |
1699 | * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) | |
1700 | * | |
1701 | * Serial Number : 32 bits (unsigned integer) | |
1702 | * | |
1703 | * This value represents a Serial Number for the ASCONF | |
1704 | * Chunk. The valid range of Serial Number is from 0 to | |
1705 | * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 | |
1706 | * after reaching 4294967295. | |
1707 | */ | |
1708 | __u32 addip_serial; | |
1709 | ||
1710 | /* Need to send an ECNE Chunk? */ | |
1711 | char need_ecne; | |
1712 | ||
1713 | /* Is it a temporary association? */ | |
1714 | char temp; | |
1715 | }; | |
1716 | ||
1717 | ||
1718 | /* An eyecatcher for determining if we are really looking at an | |
1719 | * association data structure. | |
1720 | */ | |
1721 | enum { | |
1722 | SCTP_ASSOC_EYECATCHER = 0xa550c123, | |
1723 | }; | |
1724 | ||
1725 | /* Recover the outter association structure. */ | |
1726 | static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) | |
1727 | { | |
1728 | struct sctp_association *asoc; | |
1729 | ||
1730 | asoc = container_of(base, struct sctp_association, base); | |
1731 | return asoc; | |
1732 | } | |
1733 | ||
1734 | /* These are function signatures for manipulating associations. */ | |
1735 | ||
1736 | ||
1737 | struct sctp_association * | |
1738 | sctp_association_new(const struct sctp_endpoint *, const struct sock *, | |
dd0fc66f | 1739 | sctp_scope_t scope, gfp_t gfp); |
1da177e4 LT |
1740 | void sctp_association_free(struct sctp_association *); |
1741 | void sctp_association_put(struct sctp_association *); | |
1742 | void sctp_association_hold(struct sctp_association *); | |
1743 | ||
3f7a87d2 FF |
1744 | struct sctp_transport *sctp_assoc_choose_init_transport( |
1745 | struct sctp_association *); | |
1da177e4 LT |
1746 | struct sctp_transport *sctp_assoc_choose_shutdown_transport( |
1747 | struct sctp_association *); | |
1748 | void sctp_assoc_update_retran_path(struct sctp_association *); | |
1749 | struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, | |
1750 | const union sctp_addr *); | |
1751 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, | |
1752 | const union sctp_addr *laddr); | |
1753 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, | |
1754 | const union sctp_addr *address, | |
dd0fc66f | 1755 | const gfp_t gfp, |
3f7a87d2 | 1756 | const int peer_state); |
1da177e4 LT |
1757 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
1758 | const union sctp_addr *addr); | |
3f7a87d2 FF |
1759 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
1760 | struct sctp_transport *peer); | |
1da177e4 LT |
1761 | void sctp_assoc_control_transport(struct sctp_association *, |
1762 | struct sctp_transport *, | |
1763 | sctp_transport_cmd_t, sctp_sn_error_t); | |
1764 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); | |
1765 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, | |
1766 | const union sctp_addr *, | |
1767 | const union sctp_addr *); | |
1768 | void sctp_assoc_migrate(struct sctp_association *, struct sock *); | |
1769 | void sctp_assoc_update(struct sctp_association *old, | |
1770 | struct sctp_association *new); | |
1771 | ||
1772 | __u32 sctp_association_get_next_tsn(struct sctp_association *); | |
1773 | ||
1774 | void sctp_assoc_sync_pmtu(struct sctp_association *); | |
1775 | void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); | |
1776 | void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); | |
1777 | void sctp_assoc_set_primary(struct sctp_association *, | |
1778 | struct sctp_transport *); | |
3182cd84 | 1779 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, |
dd0fc66f | 1780 | gfp_t); |
1da177e4 | 1781 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, |
3182cd84 | 1782 | struct sctp_cookie*, |
dd0fc66f | 1783 | gfp_t gfp); |
1da177e4 LT |
1784 | |
1785 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, | |
1786 | const union sctp_addr *ss2); | |
1787 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); | |
1788 | ||
1789 | /* A convenience structure to parse out SCTP specific CMSGs. */ | |
1790 | typedef struct sctp_cmsgs { | |
1791 | struct sctp_initmsg *init; | |
1792 | struct sctp_sndrcvinfo *info; | |
1793 | } sctp_cmsgs_t; | |
1794 | ||
1795 | /* Structure for tracking memory objects */ | |
1796 | typedef struct { | |
1797 | char *label; | |
1798 | atomic_t *counter; | |
1799 | } sctp_dbg_objcnt_entry_t; | |
1800 | ||
1801 | #endif /* __sctp_structs_h__ */ |