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