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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
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 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 | 8 | * |
60c778b2 | 9 | * This SCTP implementation is free software; |
1da177e4 LT |
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 | * | |
60c778b2 | 15 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
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. */ | |
1f485649 | 67 | #include <net/sctp/auth.h> /* We need auth specific structs */ |
1da177e4 LT |
68 | |
69 | /* A convenience structure for handling sockaddr structures. | |
70 | * We should wean ourselves off this. | |
71 | */ | |
72 | union sctp_addr { | |
73 | struct sockaddr_in v4; | |
74 | struct sockaddr_in6 v6; | |
75 | struct sockaddr sa; | |
76 | }; | |
77 | ||
78 | /* Forward declarations for data structures. */ | |
79 | struct sctp_globals; | |
80 | struct sctp_endpoint; | |
81 | struct sctp_association; | |
82 | struct sctp_transport; | |
83 | struct sctp_packet; | |
84 | struct sctp_chunk; | |
85 | struct sctp_inq; | |
86 | struct sctp_outq; | |
87 | struct sctp_bind_addr; | |
88 | struct sctp_ulpq; | |
89 | struct sctp_ep_common; | |
90 | struct sctp_ssnmap; | |
1b489e11 | 91 | struct crypto_hash; |
1da177e4 LT |
92 | |
93 | ||
94 | #include <net/sctp/tsnmap.h> | |
95 | #include <net/sctp/ulpevent.h> | |
96 | #include <net/sctp/ulpqueue.h> | |
97 | ||
98 | /* Structures useful for managing bind/connect. */ | |
99 | ||
100 | struct sctp_bind_bucket { | |
101 | unsigned short port; | |
102 | unsigned short fastreuse; | |
d970dbf8 | 103 | struct hlist_node node; |
1da177e4 LT |
104 | struct hlist_head owner; |
105 | }; | |
106 | ||
107 | struct sctp_bind_hashbucket { | |
108 | spinlock_t lock; | |
d970dbf8 | 109 | struct hlist_head chain; |
1da177e4 LT |
110 | }; |
111 | ||
112 | /* Used for hashing all associations. */ | |
113 | struct sctp_hashbucket { | |
114 | rwlock_t lock; | |
d970dbf8 | 115 | struct hlist_head chain; |
1da177e4 LT |
116 | } __attribute__((__aligned__(8))); |
117 | ||
118 | ||
119 | /* The SCTP globals structure. */ | |
120 | extern struct sctp_globals { | |
121 | /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values | |
122 | * | |
123 | * The following protocol parameters are RECOMMENDED: | |
124 | * | |
125 | * RTO.Initial - 3 seconds | |
126 | * RTO.Min - 1 second | |
127 | * RTO.Max - 60 seconds | |
128 | * RTO.Alpha - 1/8 (3 when converted to right shifts.) | |
129 | * RTO.Beta - 1/4 (2 when converted to right shifts.) | |
130 | */ | |
3fd091e7 VY |
131 | unsigned int rto_initial; |
132 | unsigned int rto_min; | |
133 | unsigned int rto_max; | |
1da177e4 LT |
134 | |
135 | /* Note: rto_alpha and rto_beta are really defined as inverse | |
136 | * powers of two to facilitate integer operations. | |
137 | */ | |
138 | int rto_alpha; | |
139 | int rto_beta; | |
140 | ||
141 | /* Max.Burst - 4 */ | |
142 | int max_burst; | |
143 | ||
1da177e4 LT |
144 | /* Whether Cookie Preservative is enabled(1) or not(0) */ |
145 | int cookie_preserve_enable; | |
146 | ||
8116ffad | 147 | /* Valid.Cookie.Life - 60 seconds */ |
3fd091e7 | 148 | unsigned int valid_cookie_life; |
8116ffad VY |
149 | |
150 | /* Delayed SACK timeout 200ms default*/ | |
3fd091e7 | 151 | unsigned int sack_timeout; |
8116ffad VY |
152 | |
153 | /* HB.interval - 30 seconds */ | |
3fd091e7 | 154 | unsigned int hb_interval; |
8116ffad | 155 | |
1da177e4 LT |
156 | /* Association.Max.Retrans - 10 attempts |
157 | * Path.Max.Retrans - 5 attempts (per destination address) | |
158 | * Max.Init.Retransmits - 8 attempts | |
159 | */ | |
160 | int max_retrans_association; | |
161 | int max_retrans_path; | |
162 | int max_retrans_init; | |
163 | ||
4eb701df NH |
164 | /* |
165 | * Policy for preforming sctp/socket accounting | |
166 | * 0 - do socket level accounting, all assocs share sk_sndbuf | |
167 | * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes | |
168 | */ | |
169 | int sndbuf_policy; | |
170 | ||
049b3ff5 NH |
171 | /* |
172 | * Policy for preforming sctp/socket accounting | |
173 | * 0 - do socket level accounting, all assocs share sk_rcvbuf | |
174 | * 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes | |
175 | */ | |
176 | int rcvbuf_policy; | |
177 | ||
1da177e4 LT |
178 | /* The following variables are implementation specific. */ |
179 | ||
180 | /* Default initialization values to be applied to new associations. */ | |
181 | __u16 max_instreams; | |
182 | __u16 max_outstreams; | |
183 | ||
184 | /* This is a list of groups of functions for each address | |
185 | * family that we support. | |
186 | */ | |
187 | struct list_head address_families; | |
188 | ||
189 | /* This is the hash of all endpoints. */ | |
190 | int ep_hashsize; | |
191 | struct sctp_hashbucket *ep_hashtable; | |
192 | ||
193 | /* This is the hash of all associations. */ | |
194 | int assoc_hashsize; | |
195 | struct sctp_hashbucket *assoc_hashtable; | |
196 | ||
197 | /* This is the sctp port control hash. */ | |
198 | int port_hashsize; | |
1da177e4 LT |
199 | struct sctp_bind_hashbucket *port_hashtable; |
200 | ||
201 | /* This is the global local address list. | |
29c7cf96 SS |
202 | * We actively maintain this complete list of addresses on |
203 | * the system by catching address add/delete events. | |
1da177e4 LT |
204 | * |
205 | * It is a list of sctp_sockaddr_entry. | |
206 | */ | |
207 | struct list_head local_addr_list; | |
29303547 VY |
208 | |
209 | /* Lock that protects the local_addr_list writers */ | |
210 | spinlock_t addr_list_lock; | |
1da177e4 LT |
211 | |
212 | /* Flag to indicate if addip is enabled. */ | |
213 | int addip_enable; | |
73d9c4fd | 214 | int addip_noauth_enable; |
1da177e4 LT |
215 | |
216 | /* Flag to indicate if PR-SCTP is enabled. */ | |
217 | int prsctp_enable; | |
1f485649 VY |
218 | |
219 | /* Flag to idicate if SCTP-AUTH is enabled */ | |
220 | int auth_enable; | |
1da177e4 LT |
221 | } sctp_globals; |
222 | ||
223 | #define sctp_rto_initial (sctp_globals.rto_initial) | |
224 | #define sctp_rto_min (sctp_globals.rto_min) | |
225 | #define sctp_rto_max (sctp_globals.rto_max) | |
226 | #define sctp_rto_alpha (sctp_globals.rto_alpha) | |
227 | #define sctp_rto_beta (sctp_globals.rto_beta) | |
228 | #define sctp_max_burst (sctp_globals.max_burst) | |
229 | #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) | |
230 | #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) | |
231 | #define sctp_max_retrans_association (sctp_globals.max_retrans_association) | |
4eb701df | 232 | #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) |
049b3ff5 | 233 | #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) |
1da177e4 LT |
234 | #define sctp_max_retrans_path (sctp_globals.max_retrans_path) |
235 | #define sctp_max_retrans_init (sctp_globals.max_retrans_init) | |
2f85a429 | 236 | #define sctp_sack_timeout (sctp_globals.sack_timeout) |
1da177e4 LT |
237 | #define sctp_hb_interval (sctp_globals.hb_interval) |
238 | #define sctp_max_instreams (sctp_globals.max_instreams) | |
239 | #define sctp_max_outstreams (sctp_globals.max_outstreams) | |
240 | #define sctp_address_families (sctp_globals.address_families) | |
241 | #define sctp_ep_hashsize (sctp_globals.ep_hashsize) | |
242 | #define sctp_ep_hashtable (sctp_globals.ep_hashtable) | |
243 | #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) | |
244 | #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) | |
245 | #define sctp_port_hashsize (sctp_globals.port_hashsize) | |
246 | #define sctp_port_rover (sctp_globals.port_rover) | |
247 | #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) | |
248 | #define sctp_port_hashtable (sctp_globals.port_hashtable) | |
249 | #define sctp_local_addr_list (sctp_globals.local_addr_list) | |
29303547 | 250 | #define sctp_local_addr_lock (sctp_globals.addr_list_lock) |
1da177e4 | 251 | #define sctp_addip_enable (sctp_globals.addip_enable) |
73d9c4fd | 252 | #define sctp_addip_noauth (sctp_globals.addip_noauth_enable) |
1da177e4 | 253 | #define sctp_prsctp_enable (sctp_globals.prsctp_enable) |
1f485649 | 254 | #define sctp_auth_enable (sctp_globals.auth_enable) |
1da177e4 LT |
255 | |
256 | /* SCTP Socket type: UDP or TCP style. */ | |
257 | typedef enum { | |
258 | SCTP_SOCKET_UDP = 0, | |
259 | SCTP_SOCKET_UDP_HIGH_BANDWIDTH, | |
260 | SCTP_SOCKET_TCP | |
261 | } sctp_socket_type_t; | |
262 | ||
263 | /* Per socket SCTP information. */ | |
264 | struct sctp_sock { | |
265 | /* inet_sock has to be the first member of sctp_sock */ | |
266 | struct inet_sock inet; | |
267 | /* What kind of a socket is this? */ | |
268 | sctp_socket_type_t type; | |
269 | ||
270 | /* PF_ family specific functions. */ | |
271 | struct sctp_pf *pf; | |
272 | ||
273 | /* Access to HMAC transform. */ | |
1b489e11 | 274 | struct crypto_hash *hmac; |
1da177e4 LT |
275 | |
276 | /* What is our base endpointer? */ | |
277 | struct sctp_endpoint *ep; | |
278 | ||
279 | struct sctp_bind_bucket *bind_hash; | |
280 | /* Various Socket Options. */ | |
281 | __u16 default_stream; | |
282 | __u32 default_ppid; | |
283 | __u16 default_flags; | |
284 | __u32 default_context; | |
285 | __u32 default_timetolive; | |
6ab792f5 | 286 | __u32 default_rcv_context; |
70331571 | 287 | int max_burst; |
1da177e4 | 288 | |
52ccb8e9 FF |
289 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
290 | * the destination address every heartbeat interval. This value | |
291 | * will be inherited by all new associations. | |
292 | */ | |
293 | __u32 hbinterval; | |
294 | ||
295 | /* This is the max_retrans value for new associations. */ | |
296 | __u16 pathmaxrxt; | |
297 | ||
298 | /* The initial Path MTU to use for new associations. */ | |
299 | __u32 pathmtu; | |
300 | ||
301 | /* The default SACK delay timeout for new associations. */ | |
302 | __u32 sackdelay; | |
303 | ||
f4ab2f72 | 304 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
52ccb8e9 FF |
305 | __u32 param_flags; |
306 | ||
1da177e4 LT |
307 | struct sctp_initmsg initmsg; |
308 | struct sctp_rtoinfo rtoinfo; | |
309 | struct sctp_paddrparams paddrparam; | |
310 | struct sctp_event_subscribe subscribe; | |
311 | struct sctp_assocparams assocparams; | |
312 | int user_frag; | |
313 | __u32 autoclose; | |
314 | __u8 nodelay; | |
315 | __u8 disable_fragments; | |
1da177e4 | 316 | __u8 v4mapped; |
b6e1331f | 317 | __u8 frag_interleave; |
0f3fffd8 | 318 | __u32 adaptation_ind; |
d49d91d7 | 319 | __u32 pd_point; |
1da177e4 | 320 | |
b6e1331f | 321 | atomic_t pd_mode; |
1da177e4 LT |
322 | /* Receive to here while partial delivery is in effect. */ |
323 | struct sk_buff_head pd_lobby; | |
324 | }; | |
325 | ||
326 | static inline struct sctp_sock *sctp_sk(const struct sock *sk) | |
327 | { | |
328 | return (struct sctp_sock *)sk; | |
329 | } | |
330 | ||
331 | static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) | |
332 | { | |
333 | return (struct sock *)sp; | |
334 | } | |
335 | ||
336 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
337 | struct sctp6_sock { | |
338 | struct sctp_sock sctp; | |
339 | struct ipv6_pinfo inet6; | |
340 | }; | |
341 | #endif /* CONFIG_IPV6 */ | |
342 | ||
343 | ||
344 | /* This is our APPLICATION-SPECIFIC state cookie. | |
345 | * THIS IS NOT DICTATED BY THE SPECIFICATION. | |
346 | */ | |
347 | /* These are the parts of an association which we send in the cookie. | |
348 | * Most of these are straight out of: | |
349 | * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) | |
350 | * | |
351 | */ | |
352 | ||
353 | struct sctp_cookie { | |
354 | ||
355 | /* My : Tag expected in every inbound packet and sent | |
356 | * Verification: in the INIT or INIT ACK chunk. | |
357 | * Tag : | |
358 | */ | |
359 | __u32 my_vtag; | |
360 | ||
361 | /* Peer's : Tag expected in every outbound packet except | |
362 | * Verification: in the INIT chunk. | |
363 | * Tag : | |
364 | */ | |
365 | __u32 peer_vtag; | |
366 | ||
367 | /* The rest of these are not from the spec, but really need to | |
368 | * be in the cookie. | |
369 | */ | |
370 | ||
371 | /* My Tie Tag : Assist in discovering a restarting association. */ | |
372 | __u32 my_ttag; | |
373 | ||
374 | /* Peer's Tie Tag: Assist in discovering a restarting association. */ | |
375 | __u32 peer_ttag; | |
376 | ||
377 | /* When does this cookie expire? */ | |
378 | struct timeval expiration; | |
379 | ||
380 | /* Number of inbound/outbound streams which are set | |
381 | * and negotiated during the INIT process. | |
382 | */ | |
383 | __u16 sinit_num_ostreams; | |
384 | __u16 sinit_max_instreams; | |
385 | ||
386 | /* This is the first sequence number I used. */ | |
387 | __u32 initial_tsn; | |
388 | ||
389 | /* This holds the originating address of the INIT packet. */ | |
390 | union sctp_addr peer_addr; | |
391 | ||
392 | /* IG Section 2.35.3 | |
393 | * Include the source port of the INIT-ACK | |
394 | */ | |
395 | __u16 my_port; | |
396 | ||
397 | __u8 prsctp_capable; | |
398 | ||
399 | /* Padding for future use */ | |
400 | __u8 padding; | |
401 | ||
0f3fffd8 | 402 | __u32 adaptation_ind; |
1da177e4 | 403 | |
1f485649 VY |
404 | __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; |
405 | __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; | |
406 | __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; | |
1da177e4 LT |
407 | |
408 | /* This is a shim for my peer's INIT packet, followed by | |
409 | * a copy of the raw address list of the association. | |
410 | * The length of the raw address list is saved in the | |
411 | * raw_addr_list_len field, which will be used at the time when | |
412 | * the association TCB is re-constructed from the cookie. | |
413 | */ | |
414 | __u32 raw_addr_list_len; | |
415 | struct sctp_init_chunk peer_init[0]; | |
416 | }; | |
417 | ||
418 | ||
419 | /* The format of our cookie that we send to our peer. */ | |
420 | struct sctp_signed_cookie { | |
421 | __u8 signature[SCTP_SECRET_SIZE]; | |
9834a2bb | 422 | __u32 __pad; /* force sctp_cookie alignment to 64 bits */ |
1da177e4 | 423 | struct sctp_cookie c; |
9834a2bb | 424 | } __attribute__((packed)); |
1da177e4 LT |
425 | |
426 | /* This is another convenience type to allocate memory for address | |
427 | * params for the maximum size and pass such structures around | |
428 | * internally. | |
429 | */ | |
430 | union sctp_addr_param { | |
6f4c618d | 431 | struct sctp_paramhdr p; |
1da177e4 LT |
432 | struct sctp_ipv4addr_param v4; |
433 | struct sctp_ipv6addr_param v6; | |
434 | }; | |
435 | ||
436 | /* A convenience type to allow walking through the various | |
437 | * parameters and avoid casting all over the place. | |
438 | */ | |
439 | union sctp_params { | |
440 | void *v; | |
441 | struct sctp_paramhdr *p; | |
442 | struct sctp_cookie_preserve_param *life; | |
443 | struct sctp_hostname_param *dns; | |
444 | struct sctp_cookie_param *cookie; | |
445 | struct sctp_supported_addrs_param *sat; | |
446 | struct sctp_ipv4addr_param *v4; | |
447 | struct sctp_ipv6addr_param *v6; | |
448 | union sctp_addr_param *addr; | |
0f3fffd8 | 449 | struct sctp_adaptation_ind_param *aind; |
131a47e3 | 450 | struct sctp_supported_ext_param *ext; |
1f485649 VY |
451 | struct sctp_random_param *random; |
452 | struct sctp_chunks_param *chunks; | |
453 | struct sctp_hmac_algo_param *hmac_algo; | |
d6de3097 | 454 | struct sctp_addip_param *addip; |
1da177e4 LT |
455 | }; |
456 | ||
457 | /* RFC 2960. Section 3.3.5 Heartbeat. | |
458 | * Heartbeat Information: variable length | |
459 | * The Sender-specific Heartbeat Info field should normally include | |
460 | * information about the sender's current time when this HEARTBEAT | |
461 | * chunk is sent and the destination transport address to which this | |
462 | * HEARTBEAT is sent (see Section 8.3). | |
463 | */ | |
464 | typedef struct sctp_sender_hb_info { | |
465 | struct sctp_paramhdr param_hdr; | |
466 | union sctp_addr daddr; | |
467 | unsigned long sent_at; | |
ad8fec17 | 468 | __u64 hb_nonce; |
1da177e4 LT |
469 | } __attribute__((packed)) sctp_sender_hb_info_t; |
470 | ||
471 | /* | |
472 | * RFC 2960 1.3.2 Sequenced Delivery within Streams | |
473 | * | |
474 | * The term "stream" is used in SCTP to refer to a sequence of user | |
475 | * messages that are to be delivered to the upper-layer protocol in | |
476 | * order with respect to other messages within the same stream. This is | |
477 | * in contrast to its usage in TCP, where it refers to a sequence of | |
478 | * bytes (in this document a byte is assumed to be eight bits). | |
479 | * ... | |
480 | * | |
481 | * This is the structure we use to track both our outbound and inbound | |
482 | * SSN, or Stream Sequence Numbers. | |
483 | */ | |
484 | ||
485 | struct sctp_stream { | |
486 | __u16 *ssn; | |
487 | unsigned int len; | |
488 | }; | |
489 | ||
490 | struct sctp_ssnmap { | |
491 | struct sctp_stream in; | |
492 | struct sctp_stream out; | |
493 | int malloced; | |
494 | }; | |
495 | ||
3182cd84 | 496 | struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, |
dd0fc66f | 497 | gfp_t gfp); |
1da177e4 LT |
498 | void sctp_ssnmap_free(struct sctp_ssnmap *map); |
499 | void sctp_ssnmap_clear(struct sctp_ssnmap *map); | |
500 | ||
501 | /* What is the current SSN number for this stream? */ | |
502 | static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) | |
503 | { | |
504 | return stream->ssn[id]; | |
505 | } | |
506 | ||
507 | /* Return the next SSN number for this stream. */ | |
508 | static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) | |
509 | { | |
510 | return stream->ssn[id]++; | |
511 | } | |
512 | ||
513 | /* Skip over this ssn and all below. */ | |
514 | static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, | |
515 | __u16 ssn) | |
516 | { | |
517 | stream->ssn[id] = ssn+1; | |
518 | } | |
519 | ||
520 | /* | |
521 | * Pointers to address related SCTP functions. | |
522 | * (i.e. things that depend on the address family.) | |
523 | */ | |
524 | struct sctp_af { | |
525 | int (*sctp_xmit) (struct sk_buff *skb, | |
526 | struct sctp_transport *, | |
527 | int ipfragok); | |
528 | int (*setsockopt) (struct sock *sk, | |
529 | int level, | |
530 | int optname, | |
531 | char __user *optval, | |
532 | int optlen); | |
533 | int (*getsockopt) (struct sock *sk, | |
534 | int level, | |
535 | int optname, | |
536 | char __user *optval, | |
537 | int __user *optlen); | |
3fdadf7d DM |
538 | int (*compat_setsockopt) (struct sock *sk, |
539 | int level, | |
540 | int optname, | |
541 | char __user *optval, | |
542 | int optlen); | |
543 | int (*compat_getsockopt) (struct sock *sk, | |
544 | int level, | |
545 | int optname, | |
546 | char __user *optval, | |
547 | int __user *optlen); | |
1da177e4 LT |
548 | struct dst_entry *(*get_dst) (struct sctp_association *asoc, |
549 | union sctp_addr *daddr, | |
550 | union sctp_addr *saddr); | |
551 | void (*get_saddr) (struct sctp_association *asoc, | |
552 | struct dst_entry *dst, | |
553 | union sctp_addr *daddr, | |
554 | union sctp_addr *saddr); | |
555 | void (*copy_addrlist) (struct list_head *, | |
556 | struct net_device *); | |
557 | void (*dst_saddr) (union sctp_addr *saddr, | |
558 | struct dst_entry *dst, | |
854d43a4 | 559 | __be16 port); |
1da177e4 LT |
560 | int (*cmp_addr) (const union sctp_addr *addr1, |
561 | const union sctp_addr *addr2); | |
562 | void (*addr_copy) (union sctp_addr *dst, | |
563 | union sctp_addr *src); | |
564 | void (*from_skb) (union sctp_addr *, | |
565 | struct sk_buff *skb, | |
566 | int saddr); | |
567 | void (*from_sk) (union sctp_addr *, | |
568 | struct sock *sk); | |
569 | void (*to_sk_saddr) (union sctp_addr *, | |
570 | struct sock *sk); | |
571 | void (*to_sk_daddr) (union sctp_addr *, | |
572 | struct sock *sk); | |
573 | void (*from_addr_param) (union sctp_addr *, | |
574 | union sctp_addr_param *, | |
dd86d136 | 575 | __be16 port, int iif); |
1da177e4 LT |
576 | int (*to_addr_param) (const union sctp_addr *, |
577 | union sctp_addr_param *); | |
578 | int (*addr_valid) (union sctp_addr *, | |
5636bef7 VY |
579 | struct sctp_sock *, |
580 | const struct sk_buff *); | |
1da177e4 | 581 | sctp_scope_t (*scope) (union sctp_addr *); |
6fbfa9f9 | 582 | void (*inaddr_any) (union sctp_addr *, __be16); |
1da177e4 LT |
583 | int (*is_any) (const union sctp_addr *); |
584 | int (*available) (union sctp_addr *, | |
585 | struct sctp_sock *); | |
586 | int (*skb_iif) (const struct sk_buff *sk); | |
587 | int (*is_ce) (const struct sk_buff *sk); | |
588 | void (*seq_dump_addr)(struct seq_file *seq, | |
589 | union sctp_addr *addr); | |
590 | __u16 net_header_len; | |
591 | int sockaddr_len; | |
592 | sa_family_t sa_family; | |
593 | struct list_head list; | |
594 | }; | |
595 | ||
596 | struct sctp_af *sctp_get_af_specific(sa_family_t); | |
597 | int sctp_register_af(struct sctp_af *); | |
598 | ||
599 | /* Protocol family functions. */ | |
600 | struct sctp_pf { | |
601 | void (*event_msgname)(struct sctp_ulpevent *, char *, int *); | |
602 | void (*skb_msgname) (struct sk_buff *, char *, int *); | |
603 | int (*af_supported) (sa_family_t, struct sctp_sock *); | |
604 | int (*cmp_addr) (const union sctp_addr *, | |
605 | const union sctp_addr *, | |
606 | struct sctp_sock *); | |
607 | int (*bind_verify) (struct sctp_sock *, union sctp_addr *); | |
608 | int (*send_verify) (struct sctp_sock *, union sctp_addr *); | |
3dbe8656 | 609 | int (*supported_addrs)(const struct sctp_sock *, __be16 *); |
1da177e4 LT |
610 | struct sock *(*create_accept_sk) (struct sock *sk, |
611 | struct sctp_association *asoc); | |
612 | void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); | |
613 | struct sctp_af *af; | |
614 | }; | |
615 | ||
616 | ||
617 | /* Structure to track chunk fragments that have been acked, but peer | |
618 | * fragments of the same message have not. | |
619 | */ | |
620 | struct sctp_datamsg { | |
621 | /* Chunks waiting to be submitted to lower layer. */ | |
622 | struct list_head chunks; | |
623 | /* Chunks that have been transmitted. */ | |
624 | struct list_head track; | |
625 | /* Reference counting. */ | |
626 | atomic_t refcnt; | |
627 | /* When is this message no longer interesting to the peer? */ | |
628 | unsigned long expires_at; | |
629 | /* Did the messenge fail to send? */ | |
630 | int send_error; | |
631 | char send_failed; | |
632 | /* Control whether chunks from this message can be abandoned. */ | |
633 | char can_abandon; | |
634 | }; | |
635 | ||
636 | struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, | |
637 | struct sctp_sndrcvinfo *, | |
638 | struct msghdr *, int len); | |
639 | void sctp_datamsg_put(struct sctp_datamsg *); | |
640 | void sctp_datamsg_free(struct sctp_datamsg *); | |
641 | void sctp_datamsg_track(struct sctp_chunk *); | |
642 | void sctp_chunk_fail(struct sctp_chunk *, int error); | |
643 | int sctp_chunk_abandoned(struct sctp_chunk *); | |
644 | ||
1da177e4 LT |
645 | /* RFC2960 1.4 Key Terms |
646 | * | |
647 | * o Chunk: A unit of information within an SCTP packet, consisting of | |
648 | * a chunk header and chunk-specific content. | |
649 | * | |
650 | * As a matter of convenience, we remember the SCTP common header for | |
651 | * each chunk as well as a few other header pointers... | |
652 | */ | |
653 | struct sctp_chunk { | |
79af02c2 DM |
654 | struct list_head list; |
655 | ||
1da177e4 LT |
656 | atomic_t refcnt; |
657 | ||
658 | /* This is our link to the per-transport transmitted list. */ | |
659 | struct list_head transmitted_list; | |
660 | ||
661 | /* This field is used by chunks that hold fragmented data. | |
662 | * For the first fragment this is the list that holds the rest of | |
663 | * fragments. For the remaining fragments, this is the link to the | |
664 | * frag_list maintained in the first fragment. | |
665 | */ | |
666 | struct list_head frag_list; | |
667 | ||
668 | /* This points to the sk_buff containing the actual data. */ | |
669 | struct sk_buff *skb; | |
670 | ||
671 | /* These are the SCTP headers by reverse order in a packet. | |
672 | * Note that some of these may happen more than once. In that | |
673 | * case, we point at the "current" one, whatever that means | |
674 | * for that level of header. | |
675 | */ | |
676 | ||
677 | /* We point this at the FIRST TLV parameter to chunk_hdr. */ | |
678 | union sctp_params param_hdr; | |
679 | union { | |
680 | __u8 *v; | |
681 | struct sctp_datahdr *data_hdr; | |
682 | struct sctp_inithdr *init_hdr; | |
683 | struct sctp_sackhdr *sack_hdr; | |
684 | struct sctp_heartbeathdr *hb_hdr; | |
685 | struct sctp_sender_hb_info *hbs_hdr; | |
686 | struct sctp_shutdownhdr *shutdown_hdr; | |
687 | struct sctp_signed_cookie *cookie_hdr; | |
688 | struct sctp_ecnehdr *ecne_hdr; | |
689 | struct sctp_cwrhdr *ecn_cwr_hdr; | |
690 | struct sctp_errhdr *err_hdr; | |
691 | struct sctp_addiphdr *addip_hdr; | |
692 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; | |
1f485649 | 693 | struct sctp_authhdr *auth_hdr; |
1da177e4 LT |
694 | } subh; |
695 | ||
696 | __u8 *chunk_end; | |
697 | ||
698 | struct sctp_chunkhdr *chunk_hdr; | |
699 | struct sctphdr *sctp_hdr; | |
700 | ||
701 | /* This needs to be recoverable for SCTP_SEND_FAILED events. */ | |
702 | struct sctp_sndrcvinfo sinfo; | |
703 | ||
704 | /* Which association does this belong to? */ | |
705 | struct sctp_association *asoc; | |
706 | ||
707 | /* What endpoint received this chunk? */ | |
708 | struct sctp_ep_common *rcvr; | |
709 | ||
710 | /* We fill this in if we are calculating RTT. */ | |
711 | unsigned long sent_at; | |
712 | ||
713 | /* What is the origin IP address for this chunk? */ | |
714 | union sctp_addr source; | |
715 | /* Destination address for this chunk. */ | |
716 | union sctp_addr dest; | |
717 | ||
718 | /* For outbound message, track all fragments for SEND_FAILED. */ | |
719 | struct sctp_datamsg *msg; | |
720 | ||
721 | /* For an inbound chunk, this tells us where it came from. | |
722 | * For an outbound chunk, it tells us where we'd like it to | |
723 | * go. It is NULL if we have no preference. | |
724 | */ | |
725 | struct sctp_transport *transport; | |
726 | ||
bbd0d598 VY |
727 | /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO |
728 | * we need save a pointer to the AUTH chunk, since the SCTP-AUTH | |
729 | * spec violates the principle premis that all chunks are processed | |
730 | * in order. | |
731 | */ | |
732 | struct sk_buff *auth_chunk; | |
733 | ||
1da177e4 LT |
734 | __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ |
735 | __u8 resent; /* Has this chunk ever been retransmitted. */ | |
736 | __u8 has_tsn; /* Does this chunk have a TSN yet? */ | |
737 | __u8 has_ssn; /* Does this chunk have a SSN yet? */ | |
738 | __u8 singleton; /* Was this the only chunk in the packet? */ | |
739 | __u8 end_of_packet; /* Was this the last chunk in the packet? */ | |
740 | __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ | |
741 | __u8 pdiscard; /* Discard the whole packet now? */ | |
742 | __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ | |
27852c26 | 743 | __s8 fast_retransmit; /* Is this chunk fast retransmitted? */ |
1da177e4 | 744 | __u8 tsn_missing_report; /* Data chunk missing counter. */ |
7c3ceb4f | 745 | __u8 data_accepted; /* At least 1 chunk in this packet accepted */ |
1f485649 | 746 | __u8 auth; /* IN: was auth'ed | OUT: needs auth */ |
a08de64d | 747 | __u8 has_asconf; /* IN: have seen an asconf before */ |
1da177e4 LT |
748 | }; |
749 | ||
750 | void sctp_chunk_hold(struct sctp_chunk *); | |
751 | void sctp_chunk_put(struct sctp_chunk *); | |
752 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, | |
753 | struct iovec *data); | |
754 | void sctp_chunk_free(struct sctp_chunk *); | |
755 | void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); | |
756 | struct sctp_chunk *sctp_chunkify(struct sk_buff *, | |
757 | const struct sctp_association *, | |
758 | struct sock *); | |
759 | void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, | |
760 | union sctp_addr *); | |
761 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); | |
762 | ||
f57d96b2 VY |
763 | enum { |
764 | SCTP_ADDR_NEW, /* new address added to assoc/ep */ | |
765 | SCTP_ADDR_SRC, /* address can be used as source */ | |
766 | SCTP_ADDR_DEL, /* address about to be deleted */ | |
767 | }; | |
768 | ||
1da177e4 | 769 | /* This is a structure for holding either an IPv6 or an IPv4 address. */ |
1da177e4 LT |
770 | struct sctp_sockaddr_entry { |
771 | struct list_head list; | |
29303547 | 772 | struct rcu_head rcu; |
1da177e4 | 773 | union sctp_addr a; |
f57d96b2 | 774 | __u8 state; |
29303547 | 775 | __u8 valid; |
1da177e4 LT |
776 | }; |
777 | ||
778 | typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); | |
779 | ||
780 | /* This structure holds lists of chunks as we are assembling for | |
781 | * transmission. | |
782 | */ | |
783 | struct sctp_packet { | |
784 | /* These are the SCTP header values (host order) for the packet. */ | |
785 | __u16 source_port; | |
786 | __u16 destination_port; | |
787 | __u32 vtag; | |
788 | ||
789 | /* This contains the payload chunks. */ | |
79af02c2 | 790 | struct list_head chunk_list; |
1da177e4 LT |
791 | |
792 | /* This is the overhead of the sctp and ip headers. */ | |
793 | size_t overhead; | |
794 | /* This is the total size of all chunks INCLUDING padding. */ | |
795 | size_t size; | |
796 | ||
797 | /* The packet is destined for this transport address. | |
798 | * The function we finally use to pass down to the next lower | |
799 | * layer lives in the transport structure. | |
800 | */ | |
801 | struct sctp_transport *transport; | |
802 | ||
1f485649 VY |
803 | /* pointer to the auth chunk for this packet */ |
804 | struct sctp_chunk *auth; | |
805 | ||
1da177e4 | 806 | /* This packet contains a COOKIE-ECHO chunk. */ |
1f485649 VY |
807 | __u8 has_cookie_echo; |
808 | ||
809 | /* This packet contains a SACK chunk. */ | |
810 | __u8 has_sack; | |
1da177e4 | 811 | |
1f485649 VY |
812 | /* This packet contains an AUTH chunk */ |
813 | __u8 has_auth; | |
1da177e4 | 814 | |
4cd57c80 VY |
815 | /* This packet contains at least 1 DATA chunk */ |
816 | __u8 has_data; | |
817 | ||
1da177e4 | 818 | /* SCTP cannot fragment this packet. So let ip fragment it. */ |
1f485649 | 819 | __u8 ipfragok; |
1da177e4 | 820 | |
1f485649 | 821 | __u8 malloced; |
1da177e4 LT |
822 | }; |
823 | ||
824 | struct sctp_packet *sctp_packet_init(struct sctp_packet *, | |
825 | struct sctp_transport *, | |
826 | __u16 sport, __u16 dport); | |
827 | struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); | |
828 | sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, | |
829 | struct sctp_chunk *); | |
830 | sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, | |
831 | struct sctp_chunk *); | |
832 | int sctp_packet_transmit(struct sctp_packet *); | |
833 | void sctp_packet_free(struct sctp_packet *); | |
834 | ||
835 | static inline int sctp_packet_empty(struct sctp_packet *packet) | |
836 | { | |
837 | return (packet->size == packet->overhead); | |
838 | } | |
839 | ||
840 | /* This represents a remote transport address. | |
841 | * For local transport addresses, we just use union sctp_addr. | |
842 | * | |
843 | * RFC2960 Section 1.4 Key Terms | |
844 | * | |
845 | * o Transport address: A Transport Address is traditionally defined | |
846 | * by Network Layer address, Transport Layer protocol and Transport | |
847 | * Layer port number. In the case of SCTP running over IP, a | |
848 | * transport address is defined by the combination of an IP address | |
849 | * and an SCTP port number (where SCTP is the Transport protocol). | |
850 | * | |
851 | * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control | |
852 | * | |
853 | * o The sender keeps a separate congestion control parameter set for | |
854 | * each of the destination addresses it can send to (not each | |
855 | * source-destination pair but for each destination). The parameters | |
856 | * should decay if the address is not used for a long enough time | |
857 | * period. | |
858 | * | |
859 | */ | |
860 | struct sctp_transport { | |
861 | /* A list of transports. */ | |
862 | struct list_head transports; | |
863 | ||
864 | /* Reference counting. */ | |
865 | atomic_t refcnt; | |
866 | int dead; | |
867 | ||
868 | /* This is the peer's IP address and port. */ | |
869 | union sctp_addr ipaddr; | |
870 | ||
871 | /* These are the functions we call to handle LLP stuff. */ | |
872 | struct sctp_af *af_specific; | |
873 | ||
874 | /* Which association do we belong to? */ | |
875 | struct sctp_association *asoc; | |
876 | ||
877 | /* RFC2960 | |
878 | * | |
879 | * 12.3 Per Transport Address Data | |
880 | * | |
881 | * For each destination transport address in the peer's | |
882 | * address list derived from the INIT or INIT ACK chunk, a | |
883 | * number of data elements needs to be maintained including: | |
884 | */ | |
1da177e4 | 885 | /* RTO : The current retransmission timeout value. */ |
8116ffad | 886 | unsigned long rto; |
b6157d8e VY |
887 | unsigned long last_rto; |
888 | ||
889 | __u32 rtt; /* This is the most recent RTT. */ | |
1da177e4 LT |
890 | |
891 | /* RTTVAR : The current RTT variation. */ | |
892 | __u32 rttvar; | |
893 | ||
894 | /* SRTT : The current smoothed round trip time. */ | |
895 | __u32 srtt; | |
896 | ||
897 | /* RTO-Pending : A flag used to track if one of the DATA | |
898 | * chunks sent to this address is currently being | |
899 | * used to compute a RTT. If this flag is 0, | |
900 | * the next DATA chunk sent to this destination | |
901 | * should be used to compute a RTT and this flag | |
902 | * should be set. Every time the RTT | |
903 | * calculation completes (i.e. the DATA chunk | |
904 | * is SACK'd) clear this flag. | |
905 | */ | |
906 | int rto_pending; | |
907 | ||
908 | /* | |
909 | * These are the congestion stats. | |
910 | */ | |
911 | /* cwnd : The current congestion window. */ | |
912 | __u32 cwnd; /* This is the actual cwnd. */ | |
913 | ||
914 | /* ssthresh : The current slow start threshold value. */ | |
915 | __u32 ssthresh; | |
916 | ||
917 | /* partial : The tracking method for increase of cwnd when in | |
918 | * bytes acked : congestion avoidance mode (see Section 6.2.2) | |
919 | */ | |
920 | __u32 partial_bytes_acked; | |
921 | ||
922 | /* Data that has been sent, but not acknowledged. */ | |
923 | __u32 flight_size; | |
924 | ||
1da177e4 LT |
925 | /* Destination */ |
926 | struct dst_entry *dst; | |
927 | /* Source address. */ | |
928 | union sctp_addr saddr; | |
929 | ||
930 | /* When was the last time(in jiffies) that a data packet was sent on | |
931 | * this transport? This is used to adjust the cwnd when the transport | |
932 | * becomes inactive. | |
933 | */ | |
934 | unsigned long last_time_used; | |
935 | ||
936 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to | |
937 | * the destination address every heartbeat interval. | |
938 | */ | |
8116ffad | 939 | unsigned long hbinterval; |
52ccb8e9 FF |
940 | |
941 | /* SACK delay timeout */ | |
8116ffad | 942 | unsigned long sackdelay; |
1da177e4 LT |
943 | |
944 | /* When was the last time (in jiffies) that we heard from this | |
945 | * transport? We use this to pick new active and retran paths. | |
946 | */ | |
947 | unsigned long last_time_heard; | |
948 | ||
949 | /* Last time(in jiffies) when cwnd is reduced due to the congestion | |
950 | * indication based on ECNE chunk. | |
951 | */ | |
952 | unsigned long last_time_ecne_reduced; | |
953 | ||
8116ffad VY |
954 | /* This is the max_retrans value for the transport and will |
955 | * be initialized from the assocs value. This can be changed | |
956 | * using SCTP_SET_PEER_ADDR_PARAMS socket option. | |
957 | */ | |
958 | __u16 pathmaxrxt; | |
959 | ||
8a479491 VY |
960 | /* is the Path MTU update pending on this tranport */ |
961 | __u8 pmtu_pending; | |
962 | ||
8116ffad VY |
963 | /* PMTU : The current known path MTU. */ |
964 | __u32 pathmtu; | |
965 | ||
f4ab2f72 | 966 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
8116ffad VY |
967 | __u32 param_flags; |
968 | ||
3f7a87d2 FF |
969 | /* The number of times INIT has been sent on this transport. */ |
970 | int init_sent_count; | |
971 | ||
972 | /* state : The current state of this destination, | |
973 | * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. | |
1da177e4 | 974 | */ |
3f7a87d2 | 975 | int state; |
1da177e4 | 976 | |
1da177e4 LT |
977 | /* These are the error stats for this destination. */ |
978 | ||
979 | /* Error count : The current error count for this destination. */ | |
980 | unsigned short error_count; | |
981 | ||
1da177e4 LT |
982 | /* Per : A timer used by each destination. |
983 | * Destination : | |
984 | * Timer : | |
985 | * | |
986 | * [Everywhere else in the text this is called T3-rtx. -ed] | |
987 | */ | |
988 | struct timer_list T3_rtx_timer; | |
989 | ||
990 | /* Heartbeat timer is per destination. */ | |
991 | struct timer_list hb_timer; | |
992 | ||
993 | /* Since we're using per-destination retransmission timers | |
994 | * (see above), we're also using per-destination "transmitted" | |
995 | * queues. This probably ought to be a private struct | |
996 | * accessible only within the outqueue, but it's not, yet. | |
997 | */ | |
998 | struct list_head transmitted; | |
999 | ||
1000 | /* We build bundle-able packets for this transport here. */ | |
1001 | struct sctp_packet packet; | |
1002 | ||
1003 | /* This is the list of transports that have chunks to send. */ | |
1004 | struct list_head send_ready; | |
1005 | ||
1006 | int malloced; /* Is this structure kfree()able? */ | |
1007 | ||
1008 | /* State information saved for SFR_CACC algorithm. The key | |
1009 | * idea in SFR_CACC is to maintain state at the sender on a | |
1010 | * per-destination basis when a changeover happens. | |
1011 | * char changeover_active; | |
1012 | * char cycling_changeover; | |
1013 | * __u32 next_tsn_at_change; | |
1014 | * char cacc_saw_newack; | |
1015 | */ | |
1016 | struct { | |
1017 | /* An unsigned integer, which stores the next TSN to be | |
1018 | * used by the sender, at the moment of changeover. | |
1019 | */ | |
1020 | __u32 next_tsn_at_change; | |
1021 | ||
1022 | /* A flag which indicates the occurrence of a changeover */ | |
1023 | char changeover_active; | |
1024 | ||
1025 | /* A flag which indicates whether the change of primary is | |
1026 | * the first switch to this destination address during an | |
1027 | * active switch. | |
1028 | */ | |
1029 | char cycling_changeover; | |
1030 | ||
1031 | /* A temporary flag, which is used during the processing of | |
1032 | * a SACK to estimate the causative TSN(s)'s group. | |
1033 | */ | |
1034 | char cacc_saw_newack; | |
1035 | } cacc; | |
ad8fec17 SS |
1036 | |
1037 | /* 64-bit random number sent with heartbeat. */ | |
1038 | __u64 hb_nonce; | |
1da177e4 LT |
1039 | }; |
1040 | ||
3182cd84 | 1041 | struct sctp_transport *sctp_transport_new(const union sctp_addr *, |
dd0fc66f | 1042 | gfp_t); |
1da177e4 LT |
1043 | void sctp_transport_set_owner(struct sctp_transport *, |
1044 | struct sctp_association *); | |
1045 | void sctp_transport_route(struct sctp_transport *, union sctp_addr *, | |
1046 | struct sctp_sock *); | |
1047 | void sctp_transport_pmtu(struct sctp_transport *); | |
1048 | void sctp_transport_free(struct sctp_transport *); | |
1049 | void sctp_transport_reset_timers(struct sctp_transport *); | |
1050 | void sctp_transport_hold(struct sctp_transport *); | |
1051 | void sctp_transport_put(struct sctp_transport *); | |
1052 | void sctp_transport_update_rto(struct sctp_transport *, __u32); | |
1053 | void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); | |
1054 | void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); | |
1055 | unsigned long sctp_transport_timeout(struct sctp_transport *); | |
749bf921 | 1056 | void sctp_transport_reset(struct sctp_transport *); |
c910b47e | 1057 | void sctp_transport_update_pmtu(struct sctp_transport *, u32); |
1da177e4 LT |
1058 | |
1059 | ||
1060 | /* This is the structure we use to queue packets as they come into | |
1061 | * SCTP. We write packets to it and read chunks from it. | |
1062 | */ | |
1063 | struct sctp_inq { | |
1064 | /* This is actually a queue of sctp_chunk each | |
1065 | * containing a partially decoded packet. | |
1066 | */ | |
79af02c2 | 1067 | struct list_head in_chunk_list; |
1da177e4 LT |
1068 | /* This is the packet which is currently off the in queue and is |
1069 | * being worked on through the inbound chunk processing. | |
1070 | */ | |
1071 | struct sctp_chunk *in_progress; | |
1072 | ||
1073 | /* This is the delayed task to finish delivering inbound | |
1074 | * messages. | |
1075 | */ | |
1076 | struct work_struct immediate; | |
1077 | ||
1078 | int malloced; /* Is this structure kfree()able? */ | |
1079 | }; | |
1080 | ||
1081 | void sctp_inq_init(struct sctp_inq *); | |
1082 | void sctp_inq_free(struct sctp_inq *); | |
1083 | void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); | |
1084 | struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); | |
bbd0d598 | 1085 | struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); |
c4028958 | 1086 | void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); |
1da177e4 LT |
1087 | |
1088 | /* This is the structure we use to hold outbound chunks. You push | |
1089 | * chunks in and they automatically pop out the other end as bundled | |
1090 | * packets (it calls (*output_handler)()). | |
1091 | * | |
1092 | * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, | |
1093 | * and 8.2 of the v13 draft. | |
1094 | * | |
1095 | * It handles retransmissions. The connection to the timeout portion | |
1096 | * of the state machine is through sctp_..._timeout() and timeout_handler. | |
1097 | * | |
1098 | * If you feed it SACKs, it will eat them. | |
1099 | * | |
1100 | * If you give it big chunks, it will fragment them. | |
1101 | * | |
1102 | * It assigns TSN's to data chunks. This happens at the last possible | |
1103 | * instant before transmission. | |
1104 | * | |
1105 | * When free()'d, it empties itself out via output_handler(). | |
1106 | */ | |
1107 | struct sctp_outq { | |
1108 | struct sctp_association *asoc; | |
1109 | ||
1110 | /* Data pending that has never been transmitted. */ | |
79af02c2 | 1111 | struct list_head out_chunk_list; |
1da177e4 LT |
1112 | |
1113 | unsigned out_qlen; /* Total length of queued data chunks. */ | |
1114 | ||
1115 | /* Error of send failed, may used in SCTP_SEND_FAILED event. */ | |
1116 | unsigned error; | |
1117 | ||
1118 | /* These are control chunks we want to send. */ | |
79af02c2 | 1119 | struct list_head control_chunk_list; |
1da177e4 LT |
1120 | |
1121 | /* These are chunks that have been sacked but are above the | |
1122 | * CTSN, or cumulative tsn ack point. | |
1123 | */ | |
1124 | struct list_head sacked; | |
1125 | ||
1126 | /* Put chunks on this list to schedule them for | |
1127 | * retransmission. | |
1128 | */ | |
1129 | struct list_head retransmit; | |
1130 | ||
1131 | /* Put chunks on this list to save them for FWD TSN processing as | |
1132 | * they were abandoned. | |
1133 | */ | |
1134 | struct list_head abandoned; | |
1135 | ||
1136 | /* How many unackd bytes do we have in-flight? */ | |
1137 | __u32 outstanding_bytes; | |
1138 | ||
1139 | /* Corked? */ | |
1140 | char cork; | |
1141 | ||
1142 | /* Is this structure empty? */ | |
1143 | char empty; | |
1144 | ||
1145 | /* Are we kfree()able? */ | |
1146 | char malloced; | |
1147 | }; | |
1148 | ||
1149 | void sctp_outq_init(struct sctp_association *, struct sctp_outq *); | |
1150 | void sctp_outq_teardown(struct sctp_outq *); | |
1151 | void sctp_outq_free(struct sctp_outq*); | |
1152 | int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); | |
1153 | int sctp_outq_flush(struct sctp_outq *, int); | |
1154 | int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); | |
1155 | int sctp_outq_is_empty(const struct sctp_outq *); | |
1156 | void sctp_outq_restart(struct sctp_outq *); | |
1157 | ||
1158 | void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, | |
1159 | sctp_retransmit_reason_t); | |
1160 | void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); | |
1161 | int sctp_outq_uncork(struct sctp_outq *); | |
1162 | /* Uncork and flush an outqueue. */ | |
1163 | static inline void sctp_outq_cork(struct sctp_outq *q) | |
1164 | { | |
1165 | q->cork = 1; | |
1166 | } | |
1167 | ||
1168 | /* These bind address data fields common between endpoints and associations */ | |
1169 | struct sctp_bind_addr { | |
1170 | ||
1171 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance | |
1172 | * | |
1173 | * SCTP Port: The local SCTP port number the endpoint is | |
1174 | * bound to. | |
1175 | */ | |
1176 | __u16 port; | |
1177 | ||
1178 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance | |
1179 | * | |
1180 | * Address List: The list of IP addresses that this instance | |
1181 | * has bound. This information is passed to one's | |
1182 | * peer(s) in INIT and INIT ACK chunks. | |
1183 | */ | |
1184 | struct list_head address_list; | |
1185 | ||
1186 | int malloced; /* Are we kfree()able? */ | |
1187 | }; | |
1188 | ||
1189 | void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); | |
1190 | void sctp_bind_addr_free(struct sctp_bind_addr *); | |
1191 | int sctp_bind_addr_copy(struct sctp_bind_addr *dest, | |
1192 | const struct sctp_bind_addr *src, | |
dd0fc66f | 1193 | sctp_scope_t scope, gfp_t gfp, |
3182cd84 | 1194 | int flags); |
8e71a11c VY |
1195 | int sctp_bind_addr_dup(struct sctp_bind_addr *dest, |
1196 | const struct sctp_bind_addr *src, | |
1197 | gfp_t gfp); | |
1da177e4 | 1198 | int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, |
f57d96b2 | 1199 | __u8 addr_state, gfp_t gfp); |
0ed90fb0 | 1200 | int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); |
1da177e4 LT |
1201 | int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, |
1202 | struct sctp_sock *); | |
75205f47 VY |
1203 | int sctp_bind_addr_state(const struct sctp_bind_addr *bp, |
1204 | const union sctp_addr *addr); | |
1da177e4 LT |
1205 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, |
1206 | const union sctp_addr *addrs, | |
1207 | int addrcnt, | |
1208 | struct sctp_sock *opt); | |
1209 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, | |
3182cd84 | 1210 | int *addrs_len, |
dd0fc66f | 1211 | gfp_t gfp); |
1da177e4 | 1212 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, |
dd0fc66f | 1213 | __u16 port, gfp_t gfp); |
1da177e4 LT |
1214 | |
1215 | sctp_scope_t sctp_scope(const union sctp_addr *); | |
1216 | int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); | |
1217 | int sctp_is_any(const union sctp_addr *addr); | |
1218 | int sctp_addr_is_valid(const union sctp_addr *addr); | |
1219 | ||
1220 | ||
1221 | /* What type of endpoint? */ | |
1222 | typedef enum { | |
1223 | SCTP_EP_TYPE_SOCKET, | |
1224 | SCTP_EP_TYPE_ASSOCIATION, | |
1225 | } sctp_endpoint_type_t; | |
1226 | ||
1227 | /* | |
1228 | * A common base class to bridge the implmentation view of a | |
1229 | * socket (usually listening) endpoint versus an association's | |
1230 | * local endpoint. | |
1231 | * This common structure is useful for several purposes: | |
1232 | * 1) Common interface for lookup routines. | |
1233 | * a) Subfunctions work for either endpoint or association | |
1234 | * b) Single interface to lookup allows hiding the lookup lock rather | |
1235 | * than acquiring it externally. | |
1236 | * 2) Common interface for the inbound chunk handling/state machine. | |
1237 | * 3) Common object handling routines for reference counting, etc. | |
1238 | * 4) Disentangle association lookup from endpoint lookup, where we | |
1239 | * do not have to find our endpoint to find our association. | |
1240 | * | |
1241 | */ | |
1242 | ||
1243 | struct sctp_ep_common { | |
1244 | /* Fields to help us manage our entries in the hash tables. */ | |
d970dbf8 | 1245 | struct hlist_node node; |
1da177e4 LT |
1246 | int hashent; |
1247 | ||
1248 | /* Runtime type information. What kind of endpoint is this? */ | |
1249 | sctp_endpoint_type_t type; | |
1250 | ||
1251 | /* Some fields to help us manage this object. | |
1252 | * refcnt - Reference count access to this object. | |
1253 | * dead - Do not attempt to use this object. | |
1254 | * malloced - Do we need to kfree this object? | |
1255 | */ | |
1256 | atomic_t refcnt; | |
1257 | char dead; | |
1258 | char malloced; | |
1259 | ||
1260 | /* What socket does this endpoint belong to? */ | |
1261 | struct sock *sk; | |
1262 | ||
1263 | /* This is where we receive inbound chunks. */ | |
1264 | struct sctp_inq inqueue; | |
1265 | ||
1266 | /* This substructure includes the defining parameters of the | |
1267 | * endpoint: | |
1268 | * bind_addr.port is our shared port number. | |
1269 | * bind_addr.address_list is our set of local IP addresses. | |
1270 | */ | |
1271 | struct sctp_bind_addr bind_addr; | |
1da177e4 LT |
1272 | }; |
1273 | ||
1274 | ||
1275 | /* RFC Section 1.4 Key Terms | |
1276 | * | |
1277 | * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a | |
1278 | * multi-homed host, an SCTP endpoint is represented to its peers as a | |
1279 | * combination of a set of eligible destination transport addresses to | |
1280 | * which SCTP packets can be sent and a set of eligible source | |
1281 | * transport addresses from which SCTP packets can be received. | |
1282 | * All transport addresses used by an SCTP endpoint must use the | |
1283 | * same port number, but can use multiple IP addresses. A transport | |
1284 | * address used by an SCTP endpoint must not be used by another | |
1285 | * SCTP endpoint. In other words, a transport address is unique | |
1286 | * to an SCTP endpoint. | |
1287 | * | |
1288 | * From an implementation perspective, each socket has one of these. | |
1289 | * A TCP-style socket will have exactly one association on one of | |
1290 | * these. An UDP-style socket will have multiple associations hanging | |
1291 | * off one of these. | |
1292 | */ | |
1293 | ||
1294 | struct sctp_endpoint { | |
1295 | /* Common substructure for endpoint and association. */ | |
1296 | struct sctp_ep_common base; | |
1297 | ||
1298 | /* Associations: A list of current associations and mappings | |
1299 | * to the data consumers for each association. This | |
1300 | * may be in the form of a hash table or other | |
1301 | * implementation dependent structure. The data | |
1302 | * consumers may be process identification | |
1303 | * information such as file descriptors, named pipe | |
1304 | * pointer, or table pointers dependent on how SCTP | |
1305 | * is implemented. | |
1306 | */ | |
1307 | /* This is really a list of struct sctp_association entries. */ | |
1308 | struct list_head asocs; | |
1309 | ||
1310 | /* Secret Key: A secret key used by this endpoint to compute | |
1311 | * the MAC. This SHOULD be a cryptographic quality | |
1312 | * random number with a sufficient length. | |
1313 | * Discussion in [RFC1750] can be helpful in | |
1314 | * selection of the key. | |
1315 | */ | |
1316 | __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; | |
1317 | int current_key; | |
1318 | int last_key; | |
1319 | int key_changed_at; | |
1320 | ||
313e7b4d VY |
1321 | /* digest: This is a digest of the sctp cookie. This field is |
1322 | * only used on the receive path when we try to validate | |
1323 | * that the cookie has not been tampered with. We put | |
1324 | * this here so we pre-allocate this once and can re-use | |
1325 | * on every receive. | |
1326 | */ | |
b68dbcab | 1327 | __u8 *digest; |
313e7b4d | 1328 | |
4eb701df NH |
1329 | /* sendbuf acct. policy. */ |
1330 | __u32 sndbuf_policy; | |
049b3ff5 NH |
1331 | |
1332 | /* rcvbuf acct. policy. */ | |
1333 | __u32 rcvbuf_policy; | |
1f485649 VY |
1334 | |
1335 | /* SCTP AUTH: array of the HMACs that will be allocated | |
1336 | * we need this per association so that we don't serialize | |
1337 | */ | |
1338 | struct crypto_hash **auth_hmacs; | |
1339 | ||
1340 | /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ | |
1341 | struct sctp_hmac_algo_param *auth_hmacs_list; | |
1342 | ||
1343 | /* SCTP-AUTH: chunks to authenticate encoded into parameter */ | |
1344 | struct sctp_chunks_param *auth_chunk_list; | |
1345 | ||
1346 | /* SCTP-AUTH: endpoint shared keys */ | |
1347 | struct list_head endpoint_shared_keys; | |
1348 | __u16 active_key_id; | |
1da177e4 LT |
1349 | }; |
1350 | ||
1351 | /* Recover the outter endpoint structure. */ | |
1352 | static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) | |
1353 | { | |
1354 | struct sctp_endpoint *ep; | |
1355 | ||
1356 | ep = container_of(base, struct sctp_endpoint, base); | |
1357 | return ep; | |
1358 | } | |
1359 | ||
1360 | /* These are function signatures for manipulating endpoints. */ | |
dd0fc66f | 1361 | struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); |
1da177e4 LT |
1362 | void sctp_endpoint_free(struct sctp_endpoint *); |
1363 | void sctp_endpoint_put(struct sctp_endpoint *); | |
1364 | void sctp_endpoint_hold(struct sctp_endpoint *); | |
1365 | void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); | |
1366 | struct sctp_association *sctp_endpoint_lookup_assoc( | |
1367 | const struct sctp_endpoint *ep, | |
1368 | const union sctp_addr *paddr, | |
1369 | struct sctp_transport **); | |
1370 | int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, | |
1371 | const union sctp_addr *); | |
1372 | struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, | |
1373 | const union sctp_addr *); | |
1374 | int sctp_has_association(const union sctp_addr *laddr, | |
1375 | const union sctp_addr *paddr); | |
1376 | ||
1377 | int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, | |
1378 | sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, | |
1379 | struct sctp_chunk **err_chunk); | |
1380 | int sctp_process_init(struct sctp_association *, sctp_cid_t cid, | |
1381 | const union sctp_addr *peer, | |
dd0fc66f | 1382 | sctp_init_chunk_t *init, gfp_t gfp); |
1da177e4 LT |
1383 | __u32 sctp_generate_tag(const struct sctp_endpoint *); |
1384 | __u32 sctp_generate_tsn(const struct sctp_endpoint *); | |
1385 | ||
e1857ea2 AV |
1386 | struct sctp_inithdr_host { |
1387 | __u32 init_tag; | |
1388 | __u32 a_rwnd; | |
1389 | __u16 num_outbound_streams; | |
1390 | __u16 num_inbound_streams; | |
1391 | __u32 initial_tsn; | |
1392 | }; | |
1da177e4 LT |
1393 | |
1394 | /* RFC2960 | |
1395 | * | |
1396 | * 12. Recommended Transmission Control Block (TCB) Parameters | |
1397 | * | |
1398 | * This section details a recommended set of parameters that should | |
1399 | * be contained within the TCB for an implementation. This section is | |
1400 | * for illustrative purposes and should not be deemed as requirements | |
1401 | * on an implementation or as an exhaustive list of all parameters | |
1402 | * inside an SCTP TCB. Each implementation may need its own additional | |
1403 | * parameters for optimization. | |
1404 | */ | |
1405 | ||
1406 | ||
1407 | /* Here we have information about each individual association. */ | |
1408 | struct sctp_association { | |
1409 | ||
1410 | /* A base structure common to endpoint and association. | |
1411 | * In this context, it represents the associations's view | |
1412 | * of the local endpoint of the association. | |
1413 | */ | |
1414 | struct sctp_ep_common base; | |
1415 | ||
1416 | /* Associations on the same socket. */ | |
1417 | struct list_head asocs; | |
1418 | ||
1419 | /* association id. */ | |
1420 | sctp_assoc_t assoc_id; | |
1421 | ||
1422 | /* This is our parent endpoint. */ | |
1423 | struct sctp_endpoint *ep; | |
1424 | ||
1425 | /* These are those association elements needed in the cookie. */ | |
1426 | struct sctp_cookie c; | |
1427 | ||
1428 | /* This is all information about our peer. */ | |
1429 | struct { | |
1430 | /* rwnd | |
1431 | * | |
1432 | * Peer Rwnd : Current calculated value of the peer's rwnd. | |
1433 | */ | |
1434 | __u32 rwnd; | |
1435 | ||
1436 | /* transport_addr_list | |
1437 | * | |
1438 | * Peer : A list of SCTP transport addresses that the | |
1439 | * Transport : peer is bound to. This information is derived | |
1440 | * Address : from the INIT or INIT ACK and is used to | |
1441 | * List : associate an inbound packet with a given | |
1442 | * : association. Normally this information is | |
1443 | * : hashed or keyed for quick lookup and access | |
1444 | * : of the TCB. | |
3f7a87d2 FF |
1445 | * : The list is also initialized with the list |
1446 | * : of addresses passed with the sctp_connectx() | |
1447 | * : call. | |
1da177e4 LT |
1448 | * |
1449 | * It is a list of SCTP_transport's. | |
1450 | */ | |
1451 | struct list_head transport_addr_list; | |
1452 | ||
3f7a87d2 FF |
1453 | /* transport_count |
1454 | * | |
1455 | * Peer : A count of the number of peer addresses | |
1456 | * Transport : in the Peer Transport Address List. | |
1457 | * Address : | |
1458 | * Count : | |
1459 | */ | |
1460 | __u16 transport_count; | |
1461 | ||
1da177e4 LT |
1462 | /* port |
1463 | * The transport layer port number. | |
1464 | */ | |
1465 | __u16 port; | |
1466 | ||
1467 | /* primary_path | |
1468 | * | |
1469 | * Primary : This is the current primary destination | |
1470 | * Path : transport address of the peer endpoint. It | |
1471 | * : may also specify a source transport address | |
1472 | * : on this endpoint. | |
1473 | * | |
1474 | * All of these paths live on transport_addr_list. | |
1475 | * | |
1476 | * At the bakeoffs, we discovered that the intent of | |
1477 | * primaryPath is that it only changes when the ULP | |
1478 | * asks to have it changed. We add the activePath to | |
1479 | * designate the connection we are currently using to | |
1480 | * transmit new data and most control chunks. | |
1481 | */ | |
1482 | struct sctp_transport *primary_path; | |
1483 | ||
1484 | /* Cache the primary path address here, when we | |
1485 | * need a an address for msg_name. | |
1486 | */ | |
1487 | union sctp_addr primary_addr; | |
1488 | ||
1489 | /* active_path | |
1490 | * The path that we are currently using to | |
1491 | * transmit new data and most control chunks. | |
1492 | */ | |
1493 | struct sctp_transport *active_path; | |
1494 | ||
1495 | /* retran_path | |
1496 | * | |
1497 | * RFC2960 6.4 Multi-homed SCTP Endpoints | |
1498 | * ... | |
1499 | * Furthermore, when its peer is multi-homed, an | |
1500 | * endpoint SHOULD try to retransmit a chunk to an | |
1501 | * active destination transport address that is | |
1502 | * different from the last destination address to | |
1503 | * which the DATA chunk was sent. | |
1504 | */ | |
1505 | struct sctp_transport *retran_path; | |
1506 | ||
1507 | /* Pointer to last transport I have sent on. */ | |
1508 | struct sctp_transport *last_sent_to; | |
1509 | ||
1510 | /* This is the last transport I have received DATA on. */ | |
1511 | struct sctp_transport *last_data_from; | |
1512 | ||
1513 | /* | |
1514 | * Mapping An array of bits or bytes indicating which out of | |
1515 | * Array order TSN's have been received (relative to the | |
1516 | * Last Rcvd TSN). If no gaps exist, i.e. no out of | |
1517 | * order packets have been received, this array | |
1518 | * will be set to all zero. This structure may be | |
1519 | * in the form of a circular buffer or bit array. | |
1520 | * | |
1521 | * Last Rcvd : This is the last TSN received in | |
1522 | * TSN : sequence. This value is set initially by | |
1523 | * : taking the peer's Initial TSN, received in | |
1524 | * : the INIT or INIT ACK chunk, and subtracting | |
1525 | * : one from it. | |
1526 | * | |
1527 | * Throughout most of the specification this is called the | |
1528 | * "Cumulative TSN ACK Point". In this case, we | |
1529 | * ignore the advice in 12.2 in favour of the term | |
1530 | * used in the bulk of the text. This value is hidden | |
1531 | * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). | |
1532 | */ | |
1533 | struct sctp_tsnmap tsn_map; | |
1534 | __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; | |
1535 | ||
1536 | /* Ack State : This flag indicates if the next received | |
1537 | * : packet is to be responded to with a | |
1538 | * : SACK. This is initializedto 0. When a packet | |
1539 | * : is received it is incremented. If this value | |
1540 | * : reaches 2 or more, a SACK is sent and the | |
1541 | * : value is reset to 0. Note: This is used only | |
1542 | * : when no DATA chunks are received out of | |
1543 | * : order. When DATA chunks are out of order, | |
1544 | * : SACK's are not delayed (see Section 6). | |
1545 | */ | |
1546 | __u8 sack_needed; /* Do we need to sack the peer? */ | |
1547 | ||
1548 | /* These are capabilities which our peer advertised. */ | |
1549 | __u8 ecn_capable; /* Can peer do ECN? */ | |
1550 | __u8 ipv4_address; /* Peer understands IPv4 addresses? */ | |
1551 | __u8 ipv6_address; /* Peer understands IPv6 addresses? */ | |
1552 | __u8 hostname_address;/* Peer understands DNS addresses? */ | |
1553 | __u8 asconf_capable; /* Does peer support ADDIP? */ | |
1554 | __u8 prsctp_capable; /* Can peer do PR-SCTP? */ | |
1f485649 | 1555 | __u8 auth_capable; /* Is peer doing SCTP-AUTH? */ |
1da177e4 | 1556 | |
0f3fffd8 | 1557 | __u32 adaptation_ind; /* Adaptation Code point. */ |
1da177e4 LT |
1558 | |
1559 | /* This mask is used to disable sending the ASCONF chunk | |
1560 | * with specified parameter to peer. | |
1561 | */ | |
dbc16db1 | 1562 | __be16 addip_disabled_mask; |
1da177e4 | 1563 | |
e1857ea2 | 1564 | struct sctp_inithdr_host i; |
1da177e4 LT |
1565 | int cookie_len; |
1566 | void *cookie; | |
1567 | ||
1568 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. | |
1569 | * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the | |
1570 | * Initial TSN Value minus 1 | |
1571 | */ | |
1572 | __u32 addip_serial; | |
1f485649 VY |
1573 | |
1574 | /* SCTP-AUTH: We need to know pears random number, hmac list | |
1575 | * and authenticated chunk list. All that is part of the | |
1576 | * cookie and these are just pointers to those locations | |
1577 | */ | |
1578 | sctp_random_param_t *peer_random; | |
1579 | sctp_chunks_param_t *peer_chunks; | |
1580 | sctp_hmac_algo_param_t *peer_hmacs; | |
1da177e4 LT |
1581 | } peer; |
1582 | ||
1583 | /* State : A state variable indicating what state the | |
1584 | * : association is in, i.e. COOKIE-WAIT, | |
1585 | * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, | |
1586 | * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. | |
1587 | * | |
1588 | * Note: No "CLOSED" state is illustrated since if a | |
1589 | * association is "CLOSED" its TCB SHOULD be removed. | |
1590 | * | |
1591 | * In this implementation we DO have a CLOSED | |
1592 | * state which is used during initiation and shutdown. | |
1593 | * | |
1594 | * State takes values from SCTP_STATE_*. | |
1595 | */ | |
1596 | sctp_state_t state; | |
1597 | ||
1598 | /* The cookie life I award for any cookie. */ | |
1599 | struct timeval cookie_life; | |
1600 | ||
1601 | /* Overall : The overall association error count. | |
1602 | * Error Count : [Clear this any time I get something.] | |
1603 | */ | |
1604 | int overall_error_count; | |
1605 | ||
1606 | /* These are the association's initial, max, and min RTO values. | |
1607 | * These values will be initialized by system defaults, but can | |
1608 | * be modified via the SCTP_RTOINFO socket option. | |
1609 | */ | |
8116ffad VY |
1610 | unsigned long rto_initial; |
1611 | unsigned long rto_max; | |
1612 | unsigned long rto_min; | |
1da177e4 LT |
1613 | |
1614 | /* Maximum number of new data packets that can be sent in a burst. */ | |
1615 | int max_burst; | |
1616 | ||
1617 | /* This is the max_retrans value for the association. This value will | |
1618 | * be initialized initialized from system defaults, but can be | |
1619 | * modified by the SCTP_ASSOCINFO socket option. | |
1620 | */ | |
1621 | int max_retrans; | |
1622 | ||
1623 | /* Maximum number of times the endpoint will retransmit INIT */ | |
1624 | __u16 max_init_attempts; | |
1625 | ||
1626 | /* How many times have we resent an INIT? */ | |
1627 | __u16 init_retries; | |
1628 | ||
1629 | /* The largest timeout or RTO value to use in attempting an INIT */ | |
8116ffad | 1630 | unsigned long max_init_timeo; |
1da177e4 | 1631 | |
52ccb8e9 FF |
1632 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
1633 | * the destination address every heartbeat interval. This value | |
1634 | * will be inherited by all new transports. | |
1635 | */ | |
8116ffad | 1636 | unsigned long hbinterval; |
52ccb8e9 FF |
1637 | |
1638 | /* This is the max_retrans value for new transports in the | |
1639 | * association. | |
1640 | */ | |
1641 | __u16 pathmaxrxt; | |
1642 | ||
8a479491 VY |
1643 | /* Flag that path mtu update is pending */ |
1644 | __u8 pmtu_pending; | |
1645 | ||
52ccb8e9 FF |
1646 | /* Association : The smallest PMTU discovered for all of the |
1647 | * PMTU : peer's transport addresses. | |
1648 | */ | |
1649 | __u32 pathmtu; | |
1650 | ||
f4ab2f72 | 1651 | /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
52ccb8e9 FF |
1652 | __u32 param_flags; |
1653 | ||
8116ffad VY |
1654 | /* SACK delay timeout */ |
1655 | unsigned long sackdelay; | |
1656 | ||
1657 | ||
1658 | unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; | |
1da177e4 LT |
1659 | struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; |
1660 | ||
1661 | /* Transport to which SHUTDOWN chunk was last sent. */ | |
1662 | struct sctp_transport *shutdown_last_sent_to; | |
1663 | ||
3f7a87d2 FF |
1664 | /* Transport to which INIT chunk was last sent. */ |
1665 | struct sctp_transport *init_last_sent_to; | |
1666 | ||
1da177e4 LT |
1667 | /* Next TSN : The next TSN number to be assigned to a new |
1668 | * : DATA chunk. This is sent in the INIT or INIT | |
1669 | * : ACK chunk to the peer and incremented each | |
1670 | * : time a DATA chunk is assigned a TSN | |
1671 | * : (normally just prior to transmit or during | |
1672 | * : fragmentation). | |
1673 | */ | |
1674 | __u32 next_tsn; | |
1675 | ||
1676 | /* | |
1677 | * Last Rcvd : This is the last TSN received in sequence. This value | |
1678 | * TSN : is set initially by taking the peer's Initial TSN, | |
1679 | * : received in the INIT or INIT ACK chunk, and | |
1680 | * : subtracting one from it. | |
1681 | * | |
1682 | * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. | |
1683 | */ | |
1684 | ||
1685 | __u32 ctsn_ack_point; | |
1686 | ||
1687 | /* PR-SCTP Advanced.Peer.Ack.Point */ | |
1688 | __u32 adv_peer_ack_point; | |
1689 | ||
1690 | /* Highest TSN that is acknowledged by incoming SACKs. */ | |
1691 | __u32 highest_sacked; | |
1692 | ||
1693 | /* The number of unacknowledged data chunks. Reported through | |
1694 | * the SCTP_STATUS sockopt. | |
1695 | */ | |
1696 | __u16 unack_data; | |
1697 | ||
1698 | /* This is the association's receive buffer space. This value is used | |
1699 | * to set a_rwnd field in an INIT or a SACK chunk. | |
1700 | */ | |
1701 | __u32 rwnd; | |
1702 | ||
1703 | /* This is the last advertised value of rwnd over a SACK chunk. */ | |
1704 | __u32 a_rwnd; | |
1705 | ||
1706 | /* Number of bytes by which the rwnd has slopped. The rwnd is allowed | |
1707 | * to slop over a maximum of the association's frag_point. | |
1708 | */ | |
1709 | __u32 rwnd_over; | |
1710 | ||
1711 | /* This is the sndbuf size in use for the association. | |
1712 | * This corresponds to the sndbuf size for the association, | |
1713 | * as specified in the sk->sndbuf. | |
1714 | */ | |
1715 | int sndbuf_used; | |
1716 | ||
049b3ff5 NH |
1717 | /* This is the amount of memory that this association has allocated |
1718 | * in the receive path at any given time. | |
1719 | */ | |
1720 | atomic_t rmem_alloc; | |
1721 | ||
1da177e4 LT |
1722 | /* This is the wait queue head for send requests waiting on |
1723 | * the association sndbuf space. | |
1724 | */ | |
1725 | wait_queue_head_t wait; | |
1726 | ||
1da177e4 LT |
1727 | /* The message size at which SCTP fragmentation will occur. */ |
1728 | __u32 frag_point; | |
1729 | ||
3f7a87d2 FF |
1730 | /* Counter used to count INIT errors. */ |
1731 | int init_err_counter; | |
1732 | ||
1733 | /* Count the number of INIT cycles (for doubling timeout). */ | |
1734 | int init_cycle; | |
1da177e4 LT |
1735 | |
1736 | /* Default send parameters. */ | |
1737 | __u16 default_stream; | |
1738 | __u16 default_flags; | |
1739 | __u32 default_ppid; | |
1740 | __u32 default_context; | |
1741 | __u32 default_timetolive; | |
1742 | ||
6ab792f5 ISJ |
1743 | /* Default receive parameters */ |
1744 | __u32 default_rcv_context; | |
1745 | ||
1da177e4 LT |
1746 | /* This tracks outbound ssn for a given stream. */ |
1747 | struct sctp_ssnmap *ssnmap; | |
1748 | ||
1749 | /* All outbound chunks go through this structure. */ | |
1750 | struct sctp_outq outqueue; | |
1751 | ||
1752 | /* A smart pipe that will handle reordering and fragmentation, | |
1753 | * as well as handle passing events up to the ULP. | |
1754 | */ | |
1755 | struct sctp_ulpq ulpq; | |
1756 | ||
1757 | /* Last TSN that caused an ECNE Chunk to be sent. */ | |
1758 | __u32 last_ecne_tsn; | |
1759 | ||
1760 | /* Last TSN that caused a CWR Chunk to be sent. */ | |
1761 | __u32 last_cwr_tsn; | |
1762 | ||
1763 | /* How many duplicated TSNs have we seen? */ | |
1764 | int numduptsns; | |
1765 | ||
8116ffad VY |
1766 | /* Number of seconds of idle time before an association is closed. |
1767 | * In the association context, this is really used as a boolean | |
1768 | * since the real timeout is stored in the timeouts array | |
1769 | */ | |
1da177e4 LT |
1770 | __u32 autoclose; |
1771 | ||
1772 | /* These are to support | |
1773 | * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses | |
1774 | * and Enforcement of Flow and Message Limits" | |
1775 | * <draft-ietf-tsvwg-addip-sctp-02.txt> | |
1776 | * or "ADDIP" for short. | |
1777 | */ | |
1778 | ||
1779 | ||
1780 | ||
1781 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
1782 | * | |
1783 | * R1) One and only one ASCONF Chunk MAY be in transit and | |
1784 | * unacknowledged at any one time. If a sender, after sending | |
1785 | * an ASCONF chunk, decides it needs to transfer another | |
1786 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk | |
1787 | * returns from the previous ASCONF Chunk before sending a | |
1788 | * subsequent ASCONF. Note this restriction binds each side, | |
1789 | * so at any time two ASCONF may be in-transit on any given | |
1790 | * association (one sent from each endpoint). | |
1791 | * | |
1792 | * [This is our one-and-only-one ASCONF in flight. If we do | |
1793 | * not have an ASCONF in flight, this is NULL.] | |
1794 | */ | |
1795 | struct sctp_chunk *addip_last_asconf; | |
1796 | ||
a08de64d | 1797 | /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. |
1da177e4 | 1798 | * |
a08de64d VY |
1799 | * This is needed to implement itmes E1 - E4 of the updated |
1800 | * spec. Here is the justification: | |
1da177e4 | 1801 | * |
a08de64d VY |
1802 | * Since the peer may bundle multiple ASCONF chunks toward us, |
1803 | * we now need the ability to cache multiple ACKs. The section | |
1804 | * describes in detail how they are cached and cleaned up. | |
1da177e4 | 1805 | */ |
a08de64d | 1806 | struct list_head asconf_ack_list; |
1da177e4 LT |
1807 | |
1808 | /* These ASCONF chunks are waiting to be sent. | |
1809 | * | |
1810 | * These chunaks can't be pushed to outqueue until receiving | |
1811 | * ASCONF_ACK for the previous ASCONF indicated by | |
1812 | * addip_last_asconf, so as to guarantee that only one ASCONF | |
1813 | * is in flight at any time. | |
1814 | * | |
1815 | * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
1816 | * | |
1817 | * In defining the ASCONF Chunk transfer procedures, it is | |
1818 | * essential that these transfers MUST NOT cause congestion | |
1819 | * within the network. To achieve this, we place these | |
1820 | * restrictions on the transfer of ASCONF Chunks: | |
1821 | * | |
1822 | * R1) One and only one ASCONF Chunk MAY be in transit and | |
1823 | * unacknowledged at any one time. If a sender, after sending | |
1824 | * an ASCONF chunk, decides it needs to transfer another | |
1825 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk | |
1826 | * returns from the previous ASCONF Chunk before sending a | |
1827 | * subsequent ASCONF. Note this restriction binds each side, | |
1828 | * so at any time two ASCONF may be in-transit on any given | |
1829 | * association (one sent from each endpoint). | |
1830 | * | |
1831 | * | |
1832 | * [I really think this is EXACTLY the sort of intelligence | |
1833 | * which already resides in sctp_outq. Please move this | |
1834 | * queue and its supporting logic down there. --piggy] | |
1835 | */ | |
79af02c2 | 1836 | struct list_head addip_chunk_list; |
1da177e4 LT |
1837 | |
1838 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
1839 | * | |
1840 | * A2) A serial number should be assigned to the Chunk. The | |
1841 | * serial number SHOULD be a monotonically increasing | |
1842 | * number. The serial number SHOULD be initialized at | |
1843 | * the start of the association to the same value as the | |
1844 | * Initial TSN and every time a new ASCONF chunk is created | |
1845 | * it is incremented by one after assigning the serial number | |
1846 | * to the newly created chunk. | |
1847 | * | |
1848 | * ADDIP | |
1849 | * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) | |
1850 | * | |
1851 | * Serial Number : 32 bits (unsigned integer) | |
1852 | * | |
1853 | * This value represents a Serial Number for the ASCONF | |
1854 | * Chunk. The valid range of Serial Number is from 0 to | |
1855 | * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 | |
1856 | * after reaching 4294967295. | |
1857 | */ | |
1858 | __u32 addip_serial; | |
1859 | ||
1f485649 VY |
1860 | /* SCTP AUTH: list of the endpoint shared keys. These |
1861 | * keys are provided out of band by the user applicaton | |
1862 | * and can't change during the lifetime of the association | |
1863 | */ | |
1864 | struct list_head endpoint_shared_keys; | |
1865 | ||
1866 | /* SCTP AUTH: | |
1867 | * The current generated assocaition shared key (secret) | |
1868 | */ | |
1869 | struct sctp_auth_bytes *asoc_shared_key; | |
1870 | ||
1871 | /* SCTP AUTH: hmac id of the first peer requested algorithm | |
1872 | * that we support. | |
1873 | */ | |
1874 | __u16 default_hmac_id; | |
1875 | ||
1876 | __u16 active_key_id; | |
1877 | ||
1da177e4 LT |
1878 | /* Need to send an ECNE Chunk? */ |
1879 | char need_ecne; | |
1880 | ||
1881 | /* Is it a temporary association? */ | |
1882 | char temp; | |
1883 | }; | |
1884 | ||
1885 | ||
1886 | /* An eyecatcher for determining if we are really looking at an | |
1887 | * association data structure. | |
1888 | */ | |
1889 | enum { | |
1890 | SCTP_ASSOC_EYECATCHER = 0xa550c123, | |
1891 | }; | |
1892 | ||
1893 | /* Recover the outter association structure. */ | |
1894 | static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) | |
1895 | { | |
1896 | struct sctp_association *asoc; | |
1897 | ||
1898 | asoc = container_of(base, struct sctp_association, base); | |
1899 | return asoc; | |
1900 | } | |
1901 | ||
1902 | /* These are function signatures for manipulating associations. */ | |
1903 | ||
1904 | ||
1905 | struct sctp_association * | |
1906 | sctp_association_new(const struct sctp_endpoint *, const struct sock *, | |
dd0fc66f | 1907 | sctp_scope_t scope, gfp_t gfp); |
1da177e4 LT |
1908 | void sctp_association_free(struct sctp_association *); |
1909 | void sctp_association_put(struct sctp_association *); | |
1910 | void sctp_association_hold(struct sctp_association *); | |
1911 | ||
3f7a87d2 FF |
1912 | struct sctp_transport *sctp_assoc_choose_init_transport( |
1913 | struct sctp_association *); | |
1da177e4 LT |
1914 | struct sctp_transport *sctp_assoc_choose_shutdown_transport( |
1915 | struct sctp_association *); | |
1916 | void sctp_assoc_update_retran_path(struct sctp_association *); | |
1917 | struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, | |
1918 | const union sctp_addr *); | |
1919 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, | |
1920 | const union sctp_addr *laddr); | |
1921 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, | |
1922 | const union sctp_addr *address, | |
dd0fc66f | 1923 | const gfp_t gfp, |
3f7a87d2 | 1924 | const int peer_state); |
1da177e4 LT |
1925 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
1926 | const union sctp_addr *addr); | |
3f7a87d2 FF |
1927 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
1928 | struct sctp_transport *peer); | |
1da177e4 LT |
1929 | void sctp_assoc_control_transport(struct sctp_association *, |
1930 | struct sctp_transport *, | |
1931 | sctp_transport_cmd_t, sctp_sn_error_t); | |
1932 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); | |
1933 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, | |
1934 | const union sctp_addr *, | |
1935 | const union sctp_addr *); | |
1936 | void sctp_assoc_migrate(struct sctp_association *, struct sock *); | |
1937 | void sctp_assoc_update(struct sctp_association *old, | |
1938 | struct sctp_association *new); | |
1939 | ||
1940 | __u32 sctp_association_get_next_tsn(struct sctp_association *); | |
1941 | ||
1942 | void sctp_assoc_sync_pmtu(struct sctp_association *); | |
1943 | void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); | |
1944 | void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); | |
1945 | void sctp_assoc_set_primary(struct sctp_association *, | |
1946 | struct sctp_transport *); | |
42e30bf3 VY |
1947 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *, |
1948 | struct sctp_transport *); | |
3182cd84 | 1949 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, |
dd0fc66f | 1950 | gfp_t); |
1da177e4 | 1951 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, |
3182cd84 | 1952 | struct sctp_cookie*, |
dd0fc66f | 1953 | gfp_t gfp); |
07d93967 | 1954 | int sctp_assoc_set_id(struct sctp_association *, gfp_t); |
a08de64d VY |
1955 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); |
1956 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( | |
1957 | const struct sctp_association *asoc, | |
1958 | __be32 serial); | |
1959 | ||
1da177e4 LT |
1960 | |
1961 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, | |
1962 | const union sctp_addr *ss2); | |
1963 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); | |
1964 | ||
1965 | /* A convenience structure to parse out SCTP specific CMSGs. */ | |
1966 | typedef struct sctp_cmsgs { | |
1967 | struct sctp_initmsg *init; | |
1968 | struct sctp_sndrcvinfo *info; | |
1969 | } sctp_cmsgs_t; | |
1970 | ||
1971 | /* Structure for tracking memory objects */ | |
1972 | typedef struct { | |
1973 | char *label; | |
1974 | atomic_t *counter; | |
1975 | } sctp_dbg_objcnt_entry_t; | |
1976 | ||
1977 | #endif /* __sctp_structs_h__ */ |