Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 90 | struct crypto_hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | |
| 93 | #include <net/sctp/tsnmap.h> |
| 94 | #include <net/sctp/ulpevent.h> |
| 95 | #include <net/sctp/ulpqueue.h> |
| 96 | |
| 97 | /* Structures useful for managing bind/connect. */ |
| 98 | |
| 99 | struct sctp_bind_bucket { |
| 100 | unsigned short port; |
| 101 | unsigned short fastreuse; |
| 102 | struct sctp_bind_bucket *next; |
| 103 | struct sctp_bind_bucket **pprev; |
| 104 | struct hlist_head owner; |
| 105 | }; |
| 106 | |
| 107 | struct sctp_bind_hashbucket { |
| 108 | spinlock_t lock; |
| 109 | struct sctp_bind_bucket *chain; |
| 110 | }; |
| 111 | |
| 112 | /* Used for hashing all associations. */ |
| 113 | struct sctp_hashbucket { |
| 114 | rwlock_t lock; |
| 115 | struct sctp_ep_common *chain; |
| 116 | } __attribute__((__aligned__(8))); |
| 117 | |
| 118 | |
| 119 | /* The SCTP globals structure. */ |
| 120 | extern struct sctp_globals { |
| 121 | /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values |
| 122 | * |
| 123 | * The following protocol parameters are RECOMMENDED: |
| 124 | * |
| 125 | * RTO.Initial - 3 seconds |
| 126 | * RTO.Min - 1 second |
| 127 | * RTO.Max - 60 seconds |
| 128 | * RTO.Alpha - 1/8 (3 when converted to right shifts.) |
| 129 | * RTO.Beta - 1/4 (2 when converted to right shifts.) |
| 130 | */ |
Vladislav Yasevich | 3fd091e | 2006-08-22 13:29:17 -0700 | [diff] [blame] | 131 | unsigned int rto_initial; |
| 132 | unsigned int rto_min; |
| 133 | unsigned int rto_max; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | /* Whether Cookie Preservative is enabled(1) or not(0) */ |
| 145 | int cookie_preserve_enable; |
| 146 | |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 147 | /* Valid.Cookie.Life - 60 seconds */ |
Vladislav Yasevich | 3fd091e | 2006-08-22 13:29:17 -0700 | [diff] [blame] | 148 | unsigned int valid_cookie_life; |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 149 | |
| 150 | /* Delayed SACK timeout 200ms default*/ |
Vladislav Yasevich | 3fd091e | 2006-08-22 13:29:17 -0700 | [diff] [blame] | 151 | unsigned int sack_timeout; |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 152 | |
| 153 | /* HB.interval - 30 seconds */ |
Vladislav Yasevich | 3fd091e | 2006-08-22 13:29:17 -0700 | [diff] [blame] | 154 | unsigned int hb_interval; |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Neil Horman | 4eb701d | 2005-04-28 12:02:04 -0700 | [diff] [blame] | 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 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | /* The following variables are implementation specific. */ |
| 179 | |
| 180 | /* Default initialization values to be applied to new associations. */ |
| 181 | __u16 max_instreams; |
| 182 | __u16 max_outstreams; |
| 183 | |
| 184 | /* This is a list of groups of functions for each address |
| 185 | * family that we support. |
| 186 | */ |
| 187 | struct list_head address_families; |
| 188 | |
| 189 | /* This is the hash of all endpoints. */ |
| 190 | int ep_hashsize; |
| 191 | struct sctp_hashbucket *ep_hashtable; |
| 192 | |
| 193 | /* This is the hash of all associations. */ |
| 194 | int assoc_hashsize; |
| 195 | struct sctp_hashbucket *assoc_hashtable; |
| 196 | |
| 197 | /* This is the sctp port control hash. */ |
| 198 | int port_hashsize; |
| 199 | int port_rover; |
| 200 | spinlock_t port_alloc_lock; /* Protects port_rover. */ |
| 201 | struct sctp_bind_hashbucket *port_hashtable; |
| 202 | |
| 203 | /* This is the global local address list. |
Sridhar Samudrala | 29c7cf9 | 2006-12-13 16:26:26 -0800 | [diff] [blame] | 204 | * We actively maintain this complete list of addresses on |
| 205 | * the system by catching address add/delete events. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | * |
| 207 | * It is a list of sctp_sockaddr_entry. |
| 208 | */ |
| 209 | struct list_head local_addr_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
| 211 | /* Flag to indicate if addip is enabled. */ |
| 212 | int addip_enable; |
| 213 | |
| 214 | /* Flag to indicate if PR-SCTP is enabled. */ |
| 215 | int prsctp_enable; |
| 216 | } sctp_globals; |
| 217 | |
| 218 | #define sctp_rto_initial (sctp_globals.rto_initial) |
| 219 | #define sctp_rto_min (sctp_globals.rto_min) |
| 220 | #define sctp_rto_max (sctp_globals.rto_max) |
| 221 | #define sctp_rto_alpha (sctp_globals.rto_alpha) |
| 222 | #define sctp_rto_beta (sctp_globals.rto_beta) |
| 223 | #define sctp_max_burst (sctp_globals.max_burst) |
| 224 | #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) |
| 225 | #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) |
| 226 | #define sctp_max_retrans_association (sctp_globals.max_retrans_association) |
Neil Horman | 4eb701d | 2005-04-28 12:02:04 -0700 | [diff] [blame] | 227 | #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 228 | #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | #define sctp_max_retrans_path (sctp_globals.max_retrans_path) |
| 230 | #define sctp_max_retrans_init (sctp_globals.max_retrans_init) |
Vlad Yasevich | 2f85a42 | 2005-06-28 13:24:23 -0700 | [diff] [blame] | 231 | #define sctp_sack_timeout (sctp_globals.sack_timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | #define sctp_hb_interval (sctp_globals.hb_interval) |
| 233 | #define sctp_max_instreams (sctp_globals.max_instreams) |
| 234 | #define sctp_max_outstreams (sctp_globals.max_outstreams) |
| 235 | #define sctp_address_families (sctp_globals.address_families) |
| 236 | #define sctp_ep_hashsize (sctp_globals.ep_hashsize) |
| 237 | #define sctp_ep_hashtable (sctp_globals.ep_hashtable) |
| 238 | #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) |
| 239 | #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) |
| 240 | #define sctp_port_hashsize (sctp_globals.port_hashsize) |
| 241 | #define sctp_port_rover (sctp_globals.port_rover) |
| 242 | #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) |
| 243 | #define sctp_port_hashtable (sctp_globals.port_hashtable) |
| 244 | #define sctp_local_addr_list (sctp_globals.local_addr_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | #define sctp_addip_enable (sctp_globals.addip_enable) |
| 246 | #define sctp_prsctp_enable (sctp_globals.prsctp_enable) |
| 247 | |
| 248 | /* SCTP Socket type: UDP or TCP style. */ |
| 249 | typedef enum { |
| 250 | SCTP_SOCKET_UDP = 0, |
| 251 | SCTP_SOCKET_UDP_HIGH_BANDWIDTH, |
| 252 | SCTP_SOCKET_TCP |
| 253 | } sctp_socket_type_t; |
| 254 | |
| 255 | /* Per socket SCTP information. */ |
| 256 | struct sctp_sock { |
| 257 | /* inet_sock has to be the first member of sctp_sock */ |
| 258 | struct inet_sock inet; |
| 259 | /* What kind of a socket is this? */ |
| 260 | sctp_socket_type_t type; |
| 261 | |
| 262 | /* PF_ family specific functions. */ |
| 263 | struct sctp_pf *pf; |
| 264 | |
| 265 | /* Access to HMAC transform. */ |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 266 | struct crypto_hash *hmac; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | /* What is our base endpointer? */ |
| 269 | struct sctp_endpoint *ep; |
| 270 | |
| 271 | struct sctp_bind_bucket *bind_hash; |
| 272 | /* Various Socket Options. */ |
| 273 | __u16 default_stream; |
| 274 | __u32 default_ppid; |
| 275 | __u16 default_flags; |
| 276 | __u32 default_context; |
| 277 | __u32 default_timetolive; |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame^] | 278 | __u32 default_rcv_context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 280 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
| 281 | * the destination address every heartbeat interval. This value |
| 282 | * will be inherited by all new associations. |
| 283 | */ |
| 284 | __u32 hbinterval; |
| 285 | |
| 286 | /* This is the max_retrans value for new associations. */ |
| 287 | __u16 pathmaxrxt; |
| 288 | |
| 289 | /* The initial Path MTU to use for new associations. */ |
| 290 | __u32 pathmtu; |
| 291 | |
| 292 | /* The default SACK delay timeout for new associations. */ |
| 293 | __u32 sackdelay; |
| 294 | |
| 295 | /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */ |
| 296 | __u32 param_flags; |
| 297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | struct sctp_initmsg initmsg; |
| 299 | struct sctp_rtoinfo rtoinfo; |
| 300 | struct sctp_paddrparams paddrparam; |
| 301 | struct sctp_event_subscribe subscribe; |
| 302 | struct sctp_assocparams assocparams; |
| 303 | int user_frag; |
| 304 | __u32 autoclose; |
| 305 | __u8 nodelay; |
| 306 | __u8 disable_fragments; |
| 307 | __u8 pd_mode; |
| 308 | __u8 v4mapped; |
| 309 | __u32 adaption_ind; |
| 310 | |
| 311 | /* Receive to here while partial delivery is in effect. */ |
| 312 | struct sk_buff_head pd_lobby; |
| 313 | }; |
| 314 | |
| 315 | static inline struct sctp_sock *sctp_sk(const struct sock *sk) |
| 316 | { |
| 317 | return (struct sctp_sock *)sk; |
| 318 | } |
| 319 | |
| 320 | static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) |
| 321 | { |
| 322 | return (struct sock *)sp; |
| 323 | } |
| 324 | |
| 325 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 326 | struct sctp6_sock { |
| 327 | struct sctp_sock sctp; |
| 328 | struct ipv6_pinfo inet6; |
| 329 | }; |
| 330 | #endif /* CONFIG_IPV6 */ |
| 331 | |
| 332 | |
| 333 | /* This is our APPLICATION-SPECIFIC state cookie. |
| 334 | * THIS IS NOT DICTATED BY THE SPECIFICATION. |
| 335 | */ |
| 336 | /* These are the parts of an association which we send in the cookie. |
| 337 | * Most of these are straight out of: |
| 338 | * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) |
| 339 | * |
| 340 | */ |
| 341 | |
| 342 | struct sctp_cookie { |
| 343 | |
| 344 | /* My : Tag expected in every inbound packet and sent |
| 345 | * Verification: in the INIT or INIT ACK chunk. |
| 346 | * Tag : |
| 347 | */ |
| 348 | __u32 my_vtag; |
| 349 | |
| 350 | /* Peer's : Tag expected in every outbound packet except |
| 351 | * Verification: in the INIT chunk. |
| 352 | * Tag : |
| 353 | */ |
| 354 | __u32 peer_vtag; |
| 355 | |
| 356 | /* The rest of these are not from the spec, but really need to |
| 357 | * be in the cookie. |
| 358 | */ |
| 359 | |
| 360 | /* My Tie Tag : Assist in discovering a restarting association. */ |
| 361 | __u32 my_ttag; |
| 362 | |
| 363 | /* Peer's Tie Tag: Assist in discovering a restarting association. */ |
| 364 | __u32 peer_ttag; |
| 365 | |
| 366 | /* When does this cookie expire? */ |
| 367 | struct timeval expiration; |
| 368 | |
| 369 | /* Number of inbound/outbound streams which are set |
| 370 | * and negotiated during the INIT process. |
| 371 | */ |
| 372 | __u16 sinit_num_ostreams; |
| 373 | __u16 sinit_max_instreams; |
| 374 | |
| 375 | /* This is the first sequence number I used. */ |
| 376 | __u32 initial_tsn; |
| 377 | |
| 378 | /* This holds the originating address of the INIT packet. */ |
| 379 | union sctp_addr peer_addr; |
| 380 | |
| 381 | /* IG Section 2.35.3 |
| 382 | * Include the source port of the INIT-ACK |
| 383 | */ |
| 384 | __u16 my_port; |
| 385 | |
| 386 | __u8 prsctp_capable; |
| 387 | |
| 388 | /* Padding for future use */ |
| 389 | __u8 padding; |
| 390 | |
| 391 | __u32 adaption_ind; |
| 392 | |
| 393 | |
| 394 | /* This is a shim for my peer's INIT packet, followed by |
| 395 | * a copy of the raw address list of the association. |
| 396 | * The length of the raw address list is saved in the |
| 397 | * raw_addr_list_len field, which will be used at the time when |
| 398 | * the association TCB is re-constructed from the cookie. |
| 399 | */ |
| 400 | __u32 raw_addr_list_len; |
| 401 | struct sctp_init_chunk peer_init[0]; |
| 402 | }; |
| 403 | |
| 404 | |
| 405 | /* The format of our cookie that we send to our peer. */ |
| 406 | struct sctp_signed_cookie { |
| 407 | __u8 signature[SCTP_SECRET_SIZE]; |
Vlad Yasevich | 9834a2b | 2006-01-17 11:52:12 -0800 | [diff] [blame] | 408 | __u32 __pad; /* force sctp_cookie alignment to 64 bits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | struct sctp_cookie c; |
Vlad Yasevich | 9834a2b | 2006-01-17 11:52:12 -0800 | [diff] [blame] | 410 | } __attribute__((packed)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | /* This is another convenience type to allocate memory for address |
| 413 | * params for the maximum size and pass such structures around |
| 414 | * internally. |
| 415 | */ |
| 416 | union sctp_addr_param { |
| 417 | struct sctp_ipv4addr_param v4; |
| 418 | struct sctp_ipv6addr_param v6; |
| 419 | }; |
| 420 | |
| 421 | /* A convenience type to allow walking through the various |
| 422 | * parameters and avoid casting all over the place. |
| 423 | */ |
| 424 | union sctp_params { |
| 425 | void *v; |
| 426 | struct sctp_paramhdr *p; |
| 427 | struct sctp_cookie_preserve_param *life; |
| 428 | struct sctp_hostname_param *dns; |
| 429 | struct sctp_cookie_param *cookie; |
| 430 | struct sctp_supported_addrs_param *sat; |
| 431 | struct sctp_ipv4addr_param *v4; |
| 432 | struct sctp_ipv6addr_param *v6; |
| 433 | union sctp_addr_param *addr; |
| 434 | struct sctp_adaption_ind_param *aind; |
| 435 | }; |
| 436 | |
| 437 | /* RFC 2960. Section 3.3.5 Heartbeat. |
| 438 | * Heartbeat Information: variable length |
| 439 | * The Sender-specific Heartbeat Info field should normally include |
| 440 | * information about the sender's current time when this HEARTBEAT |
| 441 | * chunk is sent and the destination transport address to which this |
| 442 | * HEARTBEAT is sent (see Section 8.3). |
| 443 | */ |
| 444 | typedef struct sctp_sender_hb_info { |
| 445 | struct sctp_paramhdr param_hdr; |
| 446 | union sctp_addr daddr; |
| 447 | unsigned long sent_at; |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 448 | __u64 hb_nonce; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } __attribute__((packed)) sctp_sender_hb_info_t; |
| 450 | |
| 451 | /* |
| 452 | * RFC 2960 1.3.2 Sequenced Delivery within Streams |
| 453 | * |
| 454 | * The term "stream" is used in SCTP to refer to a sequence of user |
| 455 | * messages that are to be delivered to the upper-layer protocol in |
| 456 | * order with respect to other messages within the same stream. This is |
| 457 | * in contrast to its usage in TCP, where it refers to a sequence of |
| 458 | * bytes (in this document a byte is assumed to be eight bits). |
| 459 | * ... |
| 460 | * |
| 461 | * This is the structure we use to track both our outbound and inbound |
| 462 | * SSN, or Stream Sequence Numbers. |
| 463 | */ |
| 464 | |
| 465 | struct sctp_stream { |
| 466 | __u16 *ssn; |
| 467 | unsigned int len; |
| 468 | }; |
| 469 | |
| 470 | struct sctp_ssnmap { |
| 471 | struct sctp_stream in; |
| 472 | struct sctp_stream out; |
| 473 | int malloced; |
| 474 | }; |
| 475 | |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 476 | struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 477 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | void sctp_ssnmap_free(struct sctp_ssnmap *map); |
| 479 | void sctp_ssnmap_clear(struct sctp_ssnmap *map); |
| 480 | |
| 481 | /* What is the current SSN number for this stream? */ |
| 482 | static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) |
| 483 | { |
| 484 | return stream->ssn[id]; |
| 485 | } |
| 486 | |
| 487 | /* Return the next SSN number for this stream. */ |
| 488 | static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) |
| 489 | { |
| 490 | return stream->ssn[id]++; |
| 491 | } |
| 492 | |
| 493 | /* Skip over this ssn and all below. */ |
| 494 | static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, |
| 495 | __u16 ssn) |
| 496 | { |
| 497 | stream->ssn[id] = ssn+1; |
| 498 | } |
| 499 | |
| 500 | /* |
| 501 | * Pointers to address related SCTP functions. |
| 502 | * (i.e. things that depend on the address family.) |
| 503 | */ |
| 504 | struct sctp_af { |
| 505 | int (*sctp_xmit) (struct sk_buff *skb, |
| 506 | struct sctp_transport *, |
| 507 | int ipfragok); |
| 508 | int (*setsockopt) (struct sock *sk, |
| 509 | int level, |
| 510 | int optname, |
| 511 | char __user *optval, |
| 512 | int optlen); |
| 513 | int (*getsockopt) (struct sock *sk, |
| 514 | int level, |
| 515 | int optname, |
| 516 | char __user *optval, |
| 517 | int __user *optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 518 | int (*compat_setsockopt) (struct sock *sk, |
| 519 | int level, |
| 520 | int optname, |
| 521 | char __user *optval, |
| 522 | int optlen); |
| 523 | int (*compat_getsockopt) (struct sock *sk, |
| 524 | int level, |
| 525 | int optname, |
| 526 | char __user *optval, |
| 527 | int __user *optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | struct dst_entry *(*get_dst) (struct sctp_association *asoc, |
| 529 | union sctp_addr *daddr, |
| 530 | union sctp_addr *saddr); |
| 531 | void (*get_saddr) (struct sctp_association *asoc, |
| 532 | struct dst_entry *dst, |
| 533 | union sctp_addr *daddr, |
| 534 | union sctp_addr *saddr); |
| 535 | void (*copy_addrlist) (struct list_head *, |
| 536 | struct net_device *); |
| 537 | void (*dst_saddr) (union sctp_addr *saddr, |
| 538 | struct dst_entry *dst, |
Al Viro | 854d43a | 2006-11-20 17:06:24 -0800 | [diff] [blame] | 539 | __be16 port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | int (*cmp_addr) (const union sctp_addr *addr1, |
| 541 | const union sctp_addr *addr2); |
| 542 | void (*addr_copy) (union sctp_addr *dst, |
| 543 | union sctp_addr *src); |
| 544 | void (*from_skb) (union sctp_addr *, |
| 545 | struct sk_buff *skb, |
| 546 | int saddr); |
| 547 | void (*from_sk) (union sctp_addr *, |
| 548 | struct sock *sk); |
| 549 | void (*to_sk_saddr) (union sctp_addr *, |
| 550 | struct sock *sk); |
| 551 | void (*to_sk_daddr) (union sctp_addr *, |
| 552 | struct sock *sk); |
| 553 | void (*from_addr_param) (union sctp_addr *, |
| 554 | union sctp_addr_param *, |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 555 | __be16 port, int iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | int (*to_addr_param) (const union sctp_addr *, |
| 557 | union sctp_addr_param *); |
| 558 | int (*addr_valid) (union sctp_addr *, |
Vlad Yasevich | 5636bef | 2006-06-17 22:55:35 -0700 | [diff] [blame] | 559 | struct sctp_sock *, |
| 560 | const struct sk_buff *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | sctp_scope_t (*scope) (union sctp_addr *); |
Al Viro | 6fbfa9f | 2006-11-20 17:24:53 -0800 | [diff] [blame] | 562 | void (*inaddr_any) (union sctp_addr *, __be16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | int (*is_any) (const union sctp_addr *); |
| 564 | int (*available) (union sctp_addr *, |
| 565 | struct sctp_sock *); |
| 566 | int (*skb_iif) (const struct sk_buff *sk); |
| 567 | int (*is_ce) (const struct sk_buff *sk); |
| 568 | void (*seq_dump_addr)(struct seq_file *seq, |
| 569 | union sctp_addr *addr); |
| 570 | __u16 net_header_len; |
| 571 | int sockaddr_len; |
| 572 | sa_family_t sa_family; |
| 573 | struct list_head list; |
| 574 | }; |
| 575 | |
| 576 | struct sctp_af *sctp_get_af_specific(sa_family_t); |
| 577 | int sctp_register_af(struct sctp_af *); |
| 578 | |
| 579 | /* Protocol family functions. */ |
| 580 | struct sctp_pf { |
| 581 | void (*event_msgname)(struct sctp_ulpevent *, char *, int *); |
| 582 | void (*skb_msgname) (struct sk_buff *, char *, int *); |
| 583 | int (*af_supported) (sa_family_t, struct sctp_sock *); |
| 584 | int (*cmp_addr) (const union sctp_addr *, |
| 585 | const union sctp_addr *, |
| 586 | struct sctp_sock *); |
| 587 | int (*bind_verify) (struct sctp_sock *, union sctp_addr *); |
| 588 | int (*send_verify) (struct sctp_sock *, union sctp_addr *); |
Al Viro | 3dbe865 | 2006-11-20 17:25:49 -0800 | [diff] [blame] | 589 | int (*supported_addrs)(const struct sctp_sock *, __be16 *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | struct sock *(*create_accept_sk) (struct sock *sk, |
| 591 | struct sctp_association *asoc); |
| 592 | void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); |
| 593 | struct sctp_af *af; |
| 594 | }; |
| 595 | |
| 596 | |
| 597 | /* Structure to track chunk fragments that have been acked, but peer |
| 598 | * fragments of the same message have not. |
| 599 | */ |
| 600 | struct sctp_datamsg { |
| 601 | /* Chunks waiting to be submitted to lower layer. */ |
| 602 | struct list_head chunks; |
| 603 | /* Chunks that have been transmitted. */ |
| 604 | struct list_head track; |
| 605 | /* Reference counting. */ |
| 606 | atomic_t refcnt; |
| 607 | /* When is this message no longer interesting to the peer? */ |
| 608 | unsigned long expires_at; |
| 609 | /* Did the messenge fail to send? */ |
| 610 | int send_error; |
| 611 | char send_failed; |
| 612 | /* Control whether chunks from this message can be abandoned. */ |
| 613 | char can_abandon; |
| 614 | }; |
| 615 | |
| 616 | struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, |
| 617 | struct sctp_sndrcvinfo *, |
| 618 | struct msghdr *, int len); |
| 619 | void sctp_datamsg_put(struct sctp_datamsg *); |
| 620 | void sctp_datamsg_free(struct sctp_datamsg *); |
| 621 | void sctp_datamsg_track(struct sctp_chunk *); |
| 622 | void sctp_chunk_fail(struct sctp_chunk *, int error); |
| 623 | int sctp_chunk_abandoned(struct sctp_chunk *); |
| 624 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | /* RFC2960 1.4 Key Terms |
| 626 | * |
| 627 | * o Chunk: A unit of information within an SCTP packet, consisting of |
| 628 | * a chunk header and chunk-specific content. |
| 629 | * |
| 630 | * As a matter of convenience, we remember the SCTP common header for |
| 631 | * each chunk as well as a few other header pointers... |
| 632 | */ |
| 633 | struct sctp_chunk { |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 634 | struct list_head list; |
| 635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | atomic_t refcnt; |
| 637 | |
| 638 | /* This is our link to the per-transport transmitted list. */ |
| 639 | struct list_head transmitted_list; |
| 640 | |
| 641 | /* This field is used by chunks that hold fragmented data. |
| 642 | * For the first fragment this is the list that holds the rest of |
| 643 | * fragments. For the remaining fragments, this is the link to the |
| 644 | * frag_list maintained in the first fragment. |
| 645 | */ |
| 646 | struct list_head frag_list; |
| 647 | |
| 648 | /* This points to the sk_buff containing the actual data. */ |
| 649 | struct sk_buff *skb; |
| 650 | |
| 651 | /* These are the SCTP headers by reverse order in a packet. |
| 652 | * Note that some of these may happen more than once. In that |
| 653 | * case, we point at the "current" one, whatever that means |
| 654 | * for that level of header. |
| 655 | */ |
| 656 | |
| 657 | /* We point this at the FIRST TLV parameter to chunk_hdr. */ |
| 658 | union sctp_params param_hdr; |
| 659 | union { |
| 660 | __u8 *v; |
| 661 | struct sctp_datahdr *data_hdr; |
| 662 | struct sctp_inithdr *init_hdr; |
| 663 | struct sctp_sackhdr *sack_hdr; |
| 664 | struct sctp_heartbeathdr *hb_hdr; |
| 665 | struct sctp_sender_hb_info *hbs_hdr; |
| 666 | struct sctp_shutdownhdr *shutdown_hdr; |
| 667 | struct sctp_signed_cookie *cookie_hdr; |
| 668 | struct sctp_ecnehdr *ecne_hdr; |
| 669 | struct sctp_cwrhdr *ecn_cwr_hdr; |
| 670 | struct sctp_errhdr *err_hdr; |
| 671 | struct sctp_addiphdr *addip_hdr; |
| 672 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
| 673 | } subh; |
| 674 | |
| 675 | __u8 *chunk_end; |
| 676 | |
| 677 | struct sctp_chunkhdr *chunk_hdr; |
| 678 | struct sctphdr *sctp_hdr; |
| 679 | |
| 680 | /* This needs to be recoverable for SCTP_SEND_FAILED events. */ |
| 681 | struct sctp_sndrcvinfo sinfo; |
| 682 | |
| 683 | /* Which association does this belong to? */ |
| 684 | struct sctp_association *asoc; |
| 685 | |
| 686 | /* What endpoint received this chunk? */ |
| 687 | struct sctp_ep_common *rcvr; |
| 688 | |
| 689 | /* We fill this in if we are calculating RTT. */ |
| 690 | unsigned long sent_at; |
| 691 | |
| 692 | /* What is the origin IP address for this chunk? */ |
| 693 | union sctp_addr source; |
| 694 | /* Destination address for this chunk. */ |
| 695 | union sctp_addr dest; |
| 696 | |
| 697 | /* For outbound message, track all fragments for SEND_FAILED. */ |
| 698 | struct sctp_datamsg *msg; |
| 699 | |
| 700 | /* For an inbound chunk, this tells us where it came from. |
| 701 | * For an outbound chunk, it tells us where we'd like it to |
| 702 | * go. It is NULL if we have no preference. |
| 703 | */ |
| 704 | struct sctp_transport *transport; |
| 705 | |
| 706 | __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ |
| 707 | __u8 resent; /* Has this chunk ever been retransmitted. */ |
| 708 | __u8 has_tsn; /* Does this chunk have a TSN yet? */ |
| 709 | __u8 has_ssn; /* Does this chunk have a SSN yet? */ |
| 710 | __u8 singleton; /* Was this the only chunk in the packet? */ |
| 711 | __u8 end_of_packet; /* Was this the last chunk in the packet? */ |
| 712 | __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ |
| 713 | __u8 pdiscard; /* Discard the whole packet now? */ |
| 714 | __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ |
Vlad Yasevich | 27852c2 | 2006-02-02 16:57:31 -0800 | [diff] [blame] | 715 | __s8 fast_retransmit; /* Is this chunk fast retransmitted? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | __u8 tsn_missing_report; /* Data chunk missing counter. */ |
Neil Horman | 7c3ceb4f | 2006-05-05 17:02:09 -0700 | [diff] [blame] | 717 | __u8 data_accepted; /* At least 1 chunk in this packet accepted */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | }; |
| 719 | |
| 720 | void sctp_chunk_hold(struct sctp_chunk *); |
| 721 | void sctp_chunk_put(struct sctp_chunk *); |
| 722 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, |
| 723 | struct iovec *data); |
| 724 | void sctp_chunk_free(struct sctp_chunk *); |
| 725 | void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); |
| 726 | struct sctp_chunk *sctp_chunkify(struct sk_buff *, |
| 727 | const struct sctp_association *, |
| 728 | struct sock *); |
| 729 | void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, |
| 730 | union sctp_addr *); |
| 731 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); |
| 732 | |
| 733 | /* This is a structure for holding either an IPv6 or an IPv4 address. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | struct sctp_sockaddr_entry { |
| 735 | struct list_head list; |
| 736 | union sctp_addr a; |
Sridhar Samudrala | dc022a9 | 2006-07-21 14:49:25 -0700 | [diff] [blame] | 737 | __u8 use_as_src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | }; |
| 739 | |
| 740 | typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); |
| 741 | |
| 742 | /* This structure holds lists of chunks as we are assembling for |
| 743 | * transmission. |
| 744 | */ |
| 745 | struct sctp_packet { |
| 746 | /* These are the SCTP header values (host order) for the packet. */ |
| 747 | __u16 source_port; |
| 748 | __u16 destination_port; |
| 749 | __u32 vtag; |
| 750 | |
| 751 | /* This contains the payload chunks. */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 752 | struct list_head chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
| 754 | /* This is the overhead of the sctp and ip headers. */ |
| 755 | size_t overhead; |
| 756 | /* This is the total size of all chunks INCLUDING padding. */ |
| 757 | size_t size; |
| 758 | |
| 759 | /* The packet is destined for this transport address. |
| 760 | * The function we finally use to pass down to the next lower |
| 761 | * layer lives in the transport structure. |
| 762 | */ |
| 763 | struct sctp_transport *transport; |
| 764 | |
| 765 | /* This packet contains a COOKIE-ECHO chunk. */ |
| 766 | char has_cookie_echo; |
| 767 | |
| 768 | /* This packet containsa SACK chunk. */ |
| 769 | char has_sack; |
| 770 | |
| 771 | /* SCTP cannot fragment this packet. So let ip fragment it. */ |
| 772 | char ipfragok; |
| 773 | |
| 774 | int malloced; |
| 775 | }; |
| 776 | |
| 777 | struct sctp_packet *sctp_packet_init(struct sctp_packet *, |
| 778 | struct sctp_transport *, |
| 779 | __u16 sport, __u16 dport); |
| 780 | struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); |
| 781 | sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, |
| 782 | struct sctp_chunk *); |
| 783 | sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, |
| 784 | struct sctp_chunk *); |
| 785 | int sctp_packet_transmit(struct sctp_packet *); |
| 786 | void sctp_packet_free(struct sctp_packet *); |
| 787 | |
| 788 | static inline int sctp_packet_empty(struct sctp_packet *packet) |
| 789 | { |
| 790 | return (packet->size == packet->overhead); |
| 791 | } |
| 792 | |
| 793 | /* This represents a remote transport address. |
| 794 | * For local transport addresses, we just use union sctp_addr. |
| 795 | * |
| 796 | * RFC2960 Section 1.4 Key Terms |
| 797 | * |
| 798 | * o Transport address: A Transport Address is traditionally defined |
| 799 | * by Network Layer address, Transport Layer protocol and Transport |
| 800 | * Layer port number. In the case of SCTP running over IP, a |
| 801 | * transport address is defined by the combination of an IP address |
| 802 | * and an SCTP port number (where SCTP is the Transport protocol). |
| 803 | * |
| 804 | * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control |
| 805 | * |
| 806 | * o The sender keeps a separate congestion control parameter set for |
| 807 | * each of the destination addresses it can send to (not each |
| 808 | * source-destination pair but for each destination). The parameters |
| 809 | * should decay if the address is not used for a long enough time |
| 810 | * period. |
| 811 | * |
| 812 | */ |
| 813 | struct sctp_transport { |
| 814 | /* A list of transports. */ |
| 815 | struct list_head transports; |
| 816 | |
| 817 | /* Reference counting. */ |
| 818 | atomic_t refcnt; |
| 819 | int dead; |
| 820 | |
| 821 | /* This is the peer's IP address and port. */ |
| 822 | union sctp_addr ipaddr; |
| 823 | |
| 824 | /* These are the functions we call to handle LLP stuff. */ |
| 825 | struct sctp_af *af_specific; |
| 826 | |
| 827 | /* Which association do we belong to? */ |
| 828 | struct sctp_association *asoc; |
| 829 | |
| 830 | /* RFC2960 |
| 831 | * |
| 832 | * 12.3 Per Transport Address Data |
| 833 | * |
| 834 | * For each destination transport address in the peer's |
| 835 | * address list derived from the INIT or INIT ACK chunk, a |
| 836 | * number of data elements needs to be maintained including: |
| 837 | */ |
| 838 | __u32 rtt; /* This is the most recent RTT. */ |
| 839 | |
| 840 | /* RTO : The current retransmission timeout value. */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 841 | unsigned long rto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
| 843 | /* RTTVAR : The current RTT variation. */ |
| 844 | __u32 rttvar; |
| 845 | |
| 846 | /* SRTT : The current smoothed round trip time. */ |
| 847 | __u32 srtt; |
| 848 | |
| 849 | /* RTO-Pending : A flag used to track if one of the DATA |
| 850 | * chunks sent to this address is currently being |
| 851 | * used to compute a RTT. If this flag is 0, |
| 852 | * the next DATA chunk sent to this destination |
| 853 | * should be used to compute a RTT and this flag |
| 854 | * should be set. Every time the RTT |
| 855 | * calculation completes (i.e. the DATA chunk |
| 856 | * is SACK'd) clear this flag. |
| 857 | */ |
| 858 | int rto_pending; |
| 859 | |
| 860 | /* |
| 861 | * These are the congestion stats. |
| 862 | */ |
| 863 | /* cwnd : The current congestion window. */ |
| 864 | __u32 cwnd; /* This is the actual cwnd. */ |
| 865 | |
| 866 | /* ssthresh : The current slow start threshold value. */ |
| 867 | __u32 ssthresh; |
| 868 | |
| 869 | /* partial : The tracking method for increase of cwnd when in |
| 870 | * bytes acked : congestion avoidance mode (see Section 6.2.2) |
| 871 | */ |
| 872 | __u32 partial_bytes_acked; |
| 873 | |
| 874 | /* Data that has been sent, but not acknowledged. */ |
| 875 | __u32 flight_size; |
| 876 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | /* Destination */ |
| 878 | struct dst_entry *dst; |
| 879 | /* Source address. */ |
| 880 | union sctp_addr saddr; |
| 881 | |
| 882 | /* When was the last time(in jiffies) that a data packet was sent on |
| 883 | * this transport? This is used to adjust the cwnd when the transport |
| 884 | * becomes inactive. |
| 885 | */ |
| 886 | unsigned long last_time_used; |
| 887 | |
| 888 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
| 889 | * the destination address every heartbeat interval. |
| 890 | */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 891 | unsigned long hbinterval; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 892 | |
| 893 | /* SACK delay timeout */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 894 | unsigned long sackdelay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
| 896 | /* When was the last time (in jiffies) that we heard from this |
| 897 | * transport? We use this to pick new active and retran paths. |
| 898 | */ |
| 899 | unsigned long last_time_heard; |
| 900 | |
| 901 | /* Last time(in jiffies) when cwnd is reduced due to the congestion |
| 902 | * indication based on ECNE chunk. |
| 903 | */ |
| 904 | unsigned long last_time_ecne_reduced; |
| 905 | |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 906 | /* This is the max_retrans value for the transport and will |
| 907 | * be initialized from the assocs value. This can be changed |
| 908 | * using SCTP_SET_PEER_ADDR_PARAMS socket option. |
| 909 | */ |
| 910 | __u16 pathmaxrxt; |
| 911 | |
| 912 | /* PMTU : The current known path MTU. */ |
| 913 | __u32 pathmtu; |
| 914 | |
| 915 | /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */ |
| 916 | __u32 param_flags; |
| 917 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 918 | /* The number of times INIT has been sent on this transport. */ |
| 919 | int init_sent_count; |
| 920 | |
| 921 | /* state : The current state of this destination, |
| 922 | * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | */ |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 924 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | /* These are the error stats for this destination. */ |
| 927 | |
| 928 | /* Error count : The current error count for this destination. */ |
| 929 | unsigned short error_count; |
| 930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | /* Per : A timer used by each destination. |
| 932 | * Destination : |
| 933 | * Timer : |
| 934 | * |
| 935 | * [Everywhere else in the text this is called T3-rtx. -ed] |
| 936 | */ |
| 937 | struct timer_list T3_rtx_timer; |
| 938 | |
| 939 | /* Heartbeat timer is per destination. */ |
| 940 | struct timer_list hb_timer; |
| 941 | |
| 942 | /* Since we're using per-destination retransmission timers |
| 943 | * (see above), we're also using per-destination "transmitted" |
| 944 | * queues. This probably ought to be a private struct |
| 945 | * accessible only within the outqueue, but it's not, yet. |
| 946 | */ |
| 947 | struct list_head transmitted; |
| 948 | |
| 949 | /* We build bundle-able packets for this transport here. */ |
| 950 | struct sctp_packet packet; |
| 951 | |
| 952 | /* This is the list of transports that have chunks to send. */ |
| 953 | struct list_head send_ready; |
| 954 | |
| 955 | int malloced; /* Is this structure kfree()able? */ |
| 956 | |
| 957 | /* State information saved for SFR_CACC algorithm. The key |
| 958 | * idea in SFR_CACC is to maintain state at the sender on a |
| 959 | * per-destination basis when a changeover happens. |
| 960 | * char changeover_active; |
| 961 | * char cycling_changeover; |
| 962 | * __u32 next_tsn_at_change; |
| 963 | * char cacc_saw_newack; |
| 964 | */ |
| 965 | struct { |
| 966 | /* An unsigned integer, which stores the next TSN to be |
| 967 | * used by the sender, at the moment of changeover. |
| 968 | */ |
| 969 | __u32 next_tsn_at_change; |
| 970 | |
| 971 | /* A flag which indicates the occurrence of a changeover */ |
| 972 | char changeover_active; |
| 973 | |
| 974 | /* A flag which indicates whether the change of primary is |
| 975 | * the first switch to this destination address during an |
| 976 | * active switch. |
| 977 | */ |
| 978 | char cycling_changeover; |
| 979 | |
| 980 | /* A temporary flag, which is used during the processing of |
| 981 | * a SACK to estimate the causative TSN(s)'s group. |
| 982 | */ |
| 983 | char cacc_saw_newack; |
| 984 | } cacc; |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 985 | |
| 986 | /* 64-bit random number sent with heartbeat. */ |
| 987 | __u64 hb_nonce; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | }; |
| 989 | |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 990 | struct sctp_transport *sctp_transport_new(const union sctp_addr *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 991 | gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | void sctp_transport_set_owner(struct sctp_transport *, |
| 993 | struct sctp_association *); |
| 994 | void sctp_transport_route(struct sctp_transport *, union sctp_addr *, |
| 995 | struct sctp_sock *); |
| 996 | void sctp_transport_pmtu(struct sctp_transport *); |
| 997 | void sctp_transport_free(struct sctp_transport *); |
| 998 | void sctp_transport_reset_timers(struct sctp_transport *); |
| 999 | void sctp_transport_hold(struct sctp_transport *); |
| 1000 | void sctp_transport_put(struct sctp_transport *); |
| 1001 | void sctp_transport_update_rto(struct sctp_transport *, __u32); |
| 1002 | void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); |
| 1003 | void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); |
| 1004 | unsigned long sctp_transport_timeout(struct sctp_transport *); |
| 1005 | |
| 1006 | |
| 1007 | /* This is the structure we use to queue packets as they come into |
| 1008 | * SCTP. We write packets to it and read chunks from it. |
| 1009 | */ |
| 1010 | struct sctp_inq { |
| 1011 | /* This is actually a queue of sctp_chunk each |
| 1012 | * containing a partially decoded packet. |
| 1013 | */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 1014 | struct list_head in_chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | /* This is the packet which is currently off the in queue and is |
| 1016 | * being worked on through the inbound chunk processing. |
| 1017 | */ |
| 1018 | struct sctp_chunk *in_progress; |
| 1019 | |
| 1020 | /* This is the delayed task to finish delivering inbound |
| 1021 | * messages. |
| 1022 | */ |
| 1023 | struct work_struct immediate; |
| 1024 | |
| 1025 | int malloced; /* Is this structure kfree()able? */ |
| 1026 | }; |
| 1027 | |
| 1028 | void sctp_inq_init(struct sctp_inq *); |
| 1029 | void sctp_inq_free(struct sctp_inq *); |
| 1030 | void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); |
| 1031 | struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1032 | void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
| 1034 | /* This is the structure we use to hold outbound chunks. You push |
| 1035 | * chunks in and they automatically pop out the other end as bundled |
| 1036 | * packets (it calls (*output_handler)()). |
| 1037 | * |
| 1038 | * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, |
| 1039 | * and 8.2 of the v13 draft. |
| 1040 | * |
| 1041 | * It handles retransmissions. The connection to the timeout portion |
| 1042 | * of the state machine is through sctp_..._timeout() and timeout_handler. |
| 1043 | * |
| 1044 | * If you feed it SACKs, it will eat them. |
| 1045 | * |
| 1046 | * If you give it big chunks, it will fragment them. |
| 1047 | * |
| 1048 | * It assigns TSN's to data chunks. This happens at the last possible |
| 1049 | * instant before transmission. |
| 1050 | * |
| 1051 | * When free()'d, it empties itself out via output_handler(). |
| 1052 | */ |
| 1053 | struct sctp_outq { |
| 1054 | struct sctp_association *asoc; |
| 1055 | |
| 1056 | /* Data pending that has never been transmitted. */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 1057 | struct list_head out_chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | |
| 1059 | unsigned out_qlen; /* Total length of queued data chunks. */ |
| 1060 | |
| 1061 | /* Error of send failed, may used in SCTP_SEND_FAILED event. */ |
| 1062 | unsigned error; |
| 1063 | |
| 1064 | /* These are control chunks we want to send. */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 1065 | struct list_head control_chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
| 1067 | /* These are chunks that have been sacked but are above the |
| 1068 | * CTSN, or cumulative tsn ack point. |
| 1069 | */ |
| 1070 | struct list_head sacked; |
| 1071 | |
| 1072 | /* Put chunks on this list to schedule them for |
| 1073 | * retransmission. |
| 1074 | */ |
| 1075 | struct list_head retransmit; |
| 1076 | |
| 1077 | /* Put chunks on this list to save them for FWD TSN processing as |
| 1078 | * they were abandoned. |
| 1079 | */ |
| 1080 | struct list_head abandoned; |
| 1081 | |
| 1082 | /* How many unackd bytes do we have in-flight? */ |
| 1083 | __u32 outstanding_bytes; |
| 1084 | |
| 1085 | /* Corked? */ |
| 1086 | char cork; |
| 1087 | |
| 1088 | /* Is this structure empty? */ |
| 1089 | char empty; |
| 1090 | |
| 1091 | /* Are we kfree()able? */ |
| 1092 | char malloced; |
| 1093 | }; |
| 1094 | |
| 1095 | void sctp_outq_init(struct sctp_association *, struct sctp_outq *); |
| 1096 | void sctp_outq_teardown(struct sctp_outq *); |
| 1097 | void sctp_outq_free(struct sctp_outq*); |
| 1098 | int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); |
| 1099 | int sctp_outq_flush(struct sctp_outq *, int); |
| 1100 | int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); |
| 1101 | int sctp_outq_is_empty(const struct sctp_outq *); |
| 1102 | void sctp_outq_restart(struct sctp_outq *); |
| 1103 | |
| 1104 | void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, |
| 1105 | sctp_retransmit_reason_t); |
| 1106 | void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); |
| 1107 | int sctp_outq_uncork(struct sctp_outq *); |
| 1108 | /* Uncork and flush an outqueue. */ |
| 1109 | static inline void sctp_outq_cork(struct sctp_outq *q) |
| 1110 | { |
| 1111 | q->cork = 1; |
| 1112 | } |
| 1113 | |
| 1114 | /* These bind address data fields common between endpoints and associations */ |
| 1115 | struct sctp_bind_addr { |
| 1116 | |
| 1117 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance |
| 1118 | * |
| 1119 | * SCTP Port: The local SCTP port number the endpoint is |
| 1120 | * bound to. |
| 1121 | */ |
| 1122 | __u16 port; |
| 1123 | |
| 1124 | /* RFC 2960 12.1 Parameters necessary for the SCTP instance |
| 1125 | * |
| 1126 | * Address List: The list of IP addresses that this instance |
| 1127 | * has bound. This information is passed to one's |
| 1128 | * peer(s) in INIT and INIT ACK chunks. |
| 1129 | */ |
| 1130 | struct list_head address_list; |
| 1131 | |
| 1132 | int malloced; /* Are we kfree()able? */ |
| 1133 | }; |
| 1134 | |
| 1135 | void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); |
| 1136 | void sctp_bind_addr_free(struct sctp_bind_addr *); |
| 1137 | int sctp_bind_addr_copy(struct sctp_bind_addr *dest, |
| 1138 | const struct sctp_bind_addr *src, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1139 | sctp_scope_t scope, gfp_t gfp, |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1140 | int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, |
Sridhar Samudrala | dc022a9 | 2006-07-21 14:49:25 -0700 | [diff] [blame] | 1142 | __u8 use_as_src, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); |
| 1144 | int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, |
| 1145 | struct sctp_sock *); |
| 1146 | union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, |
| 1147 | const union sctp_addr *addrs, |
| 1148 | int addrcnt, |
| 1149 | struct sctp_sock *opt); |
| 1150 | union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1151 | int *addrs_len, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1152 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1154 | __u16 port, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
| 1156 | sctp_scope_t sctp_scope(const union sctp_addr *); |
| 1157 | int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); |
| 1158 | int sctp_is_any(const union sctp_addr *addr); |
| 1159 | int sctp_addr_is_valid(const union sctp_addr *addr); |
| 1160 | |
| 1161 | |
| 1162 | /* What type of endpoint? */ |
| 1163 | typedef enum { |
| 1164 | SCTP_EP_TYPE_SOCKET, |
| 1165 | SCTP_EP_TYPE_ASSOCIATION, |
| 1166 | } sctp_endpoint_type_t; |
| 1167 | |
| 1168 | /* |
| 1169 | * A common base class to bridge the implmentation view of a |
| 1170 | * socket (usually listening) endpoint versus an association's |
| 1171 | * local endpoint. |
| 1172 | * This common structure is useful for several purposes: |
| 1173 | * 1) Common interface for lookup routines. |
| 1174 | * a) Subfunctions work for either endpoint or association |
| 1175 | * b) Single interface to lookup allows hiding the lookup lock rather |
| 1176 | * than acquiring it externally. |
| 1177 | * 2) Common interface for the inbound chunk handling/state machine. |
| 1178 | * 3) Common object handling routines for reference counting, etc. |
| 1179 | * 4) Disentangle association lookup from endpoint lookup, where we |
| 1180 | * do not have to find our endpoint to find our association. |
| 1181 | * |
| 1182 | */ |
| 1183 | |
| 1184 | struct sctp_ep_common { |
| 1185 | /* Fields to help us manage our entries in the hash tables. */ |
| 1186 | struct sctp_ep_common *next; |
| 1187 | struct sctp_ep_common **pprev; |
| 1188 | int hashent; |
| 1189 | |
| 1190 | /* Runtime type information. What kind of endpoint is this? */ |
| 1191 | sctp_endpoint_type_t type; |
| 1192 | |
| 1193 | /* Some fields to help us manage this object. |
| 1194 | * refcnt - Reference count access to this object. |
| 1195 | * dead - Do not attempt to use this object. |
| 1196 | * malloced - Do we need to kfree this object? |
| 1197 | */ |
| 1198 | atomic_t refcnt; |
| 1199 | char dead; |
| 1200 | char malloced; |
| 1201 | |
| 1202 | /* What socket does this endpoint belong to? */ |
| 1203 | struct sock *sk; |
| 1204 | |
| 1205 | /* This is where we receive inbound chunks. */ |
| 1206 | struct sctp_inq inqueue; |
| 1207 | |
| 1208 | /* This substructure includes the defining parameters of the |
| 1209 | * endpoint: |
| 1210 | * bind_addr.port is our shared port number. |
| 1211 | * bind_addr.address_list is our set of local IP addresses. |
| 1212 | */ |
| 1213 | struct sctp_bind_addr bind_addr; |
| 1214 | |
| 1215 | /* Protection during address list comparisons. */ |
| 1216 | rwlock_t addr_lock; |
| 1217 | }; |
| 1218 | |
| 1219 | |
| 1220 | /* RFC Section 1.4 Key Terms |
| 1221 | * |
| 1222 | * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a |
| 1223 | * multi-homed host, an SCTP endpoint is represented to its peers as a |
| 1224 | * combination of a set of eligible destination transport addresses to |
| 1225 | * which SCTP packets can be sent and a set of eligible source |
| 1226 | * transport addresses from which SCTP packets can be received. |
| 1227 | * All transport addresses used by an SCTP endpoint must use the |
| 1228 | * same port number, but can use multiple IP addresses. A transport |
| 1229 | * address used by an SCTP endpoint must not be used by another |
| 1230 | * SCTP endpoint. In other words, a transport address is unique |
| 1231 | * to an SCTP endpoint. |
| 1232 | * |
| 1233 | * From an implementation perspective, each socket has one of these. |
| 1234 | * A TCP-style socket will have exactly one association on one of |
| 1235 | * these. An UDP-style socket will have multiple associations hanging |
| 1236 | * off one of these. |
| 1237 | */ |
| 1238 | |
| 1239 | struct sctp_endpoint { |
| 1240 | /* Common substructure for endpoint and association. */ |
| 1241 | struct sctp_ep_common base; |
| 1242 | |
| 1243 | /* Associations: A list of current associations and mappings |
| 1244 | * to the data consumers for each association. This |
| 1245 | * may be in the form of a hash table or other |
| 1246 | * implementation dependent structure. The data |
| 1247 | * consumers may be process identification |
| 1248 | * information such as file descriptors, named pipe |
| 1249 | * pointer, or table pointers dependent on how SCTP |
| 1250 | * is implemented. |
| 1251 | */ |
| 1252 | /* This is really a list of struct sctp_association entries. */ |
| 1253 | struct list_head asocs; |
| 1254 | |
| 1255 | /* Secret Key: A secret key used by this endpoint to compute |
| 1256 | * the MAC. This SHOULD be a cryptographic quality |
| 1257 | * random number with a sufficient length. |
| 1258 | * Discussion in [RFC1750] can be helpful in |
| 1259 | * selection of the key. |
| 1260 | */ |
| 1261 | __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; |
| 1262 | int current_key; |
| 1263 | int last_key; |
| 1264 | int key_changed_at; |
| 1265 | |
Vlad Yasevich | 313e7b4 | 2006-01-17 11:55:57 -0800 | [diff] [blame] | 1266 | /* digest: This is a digest of the sctp cookie. This field is |
| 1267 | * only used on the receive path when we try to validate |
| 1268 | * that the cookie has not been tampered with. We put |
| 1269 | * this here so we pre-allocate this once and can re-use |
| 1270 | * on every receive. |
| 1271 | */ |
Vlad Yasevich | b68dbca | 2006-11-09 16:29:57 -0800 | [diff] [blame] | 1272 | __u8 *digest; |
Vlad Yasevich | 313e7b4 | 2006-01-17 11:55:57 -0800 | [diff] [blame] | 1273 | |
Neil Horman | 4eb701d | 2005-04-28 12:02:04 -0700 | [diff] [blame] | 1274 | /* sendbuf acct. policy. */ |
| 1275 | __u32 sndbuf_policy; |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 1276 | |
| 1277 | /* rcvbuf acct. policy. */ |
| 1278 | __u32 rcvbuf_policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | }; |
| 1280 | |
| 1281 | /* Recover the outter endpoint structure. */ |
| 1282 | static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) |
| 1283 | { |
| 1284 | struct sctp_endpoint *ep; |
| 1285 | |
| 1286 | ep = container_of(base, struct sctp_endpoint, base); |
| 1287 | return ep; |
| 1288 | } |
| 1289 | |
| 1290 | /* These are function signatures for manipulating endpoints. */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1291 | struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | void sctp_endpoint_free(struct sctp_endpoint *); |
| 1293 | void sctp_endpoint_put(struct sctp_endpoint *); |
| 1294 | void sctp_endpoint_hold(struct sctp_endpoint *); |
| 1295 | void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); |
| 1296 | struct sctp_association *sctp_endpoint_lookup_assoc( |
| 1297 | const struct sctp_endpoint *ep, |
| 1298 | const union sctp_addr *paddr, |
| 1299 | struct sctp_transport **); |
| 1300 | int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, |
| 1301 | const union sctp_addr *); |
| 1302 | struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, |
| 1303 | const union sctp_addr *); |
| 1304 | int sctp_has_association(const union sctp_addr *laddr, |
| 1305 | const union sctp_addr *paddr); |
| 1306 | |
| 1307 | int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, |
| 1308 | sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, |
| 1309 | struct sctp_chunk **err_chunk); |
| 1310 | int sctp_process_init(struct sctp_association *, sctp_cid_t cid, |
| 1311 | const union sctp_addr *peer, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1312 | sctp_init_chunk_t *init, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | __u32 sctp_generate_tag(const struct sctp_endpoint *); |
| 1314 | __u32 sctp_generate_tsn(const struct sctp_endpoint *); |
| 1315 | |
Al Viro | e1857ea | 2006-11-20 17:25:32 -0800 | [diff] [blame] | 1316 | struct sctp_inithdr_host { |
| 1317 | __u32 init_tag; |
| 1318 | __u32 a_rwnd; |
| 1319 | __u16 num_outbound_streams; |
| 1320 | __u16 num_inbound_streams; |
| 1321 | __u32 initial_tsn; |
| 1322 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | |
| 1324 | /* RFC2960 |
| 1325 | * |
| 1326 | * 12. Recommended Transmission Control Block (TCB) Parameters |
| 1327 | * |
| 1328 | * This section details a recommended set of parameters that should |
| 1329 | * be contained within the TCB for an implementation. This section is |
| 1330 | * for illustrative purposes and should not be deemed as requirements |
| 1331 | * on an implementation or as an exhaustive list of all parameters |
| 1332 | * inside an SCTP TCB. Each implementation may need its own additional |
| 1333 | * parameters for optimization. |
| 1334 | */ |
| 1335 | |
| 1336 | |
| 1337 | /* Here we have information about each individual association. */ |
| 1338 | struct sctp_association { |
| 1339 | |
| 1340 | /* A base structure common to endpoint and association. |
| 1341 | * In this context, it represents the associations's view |
| 1342 | * of the local endpoint of the association. |
| 1343 | */ |
| 1344 | struct sctp_ep_common base; |
| 1345 | |
| 1346 | /* Associations on the same socket. */ |
| 1347 | struct list_head asocs; |
| 1348 | |
| 1349 | /* association id. */ |
| 1350 | sctp_assoc_t assoc_id; |
| 1351 | |
| 1352 | /* This is our parent endpoint. */ |
| 1353 | struct sctp_endpoint *ep; |
| 1354 | |
| 1355 | /* These are those association elements needed in the cookie. */ |
| 1356 | struct sctp_cookie c; |
| 1357 | |
| 1358 | /* This is all information about our peer. */ |
| 1359 | struct { |
| 1360 | /* rwnd |
| 1361 | * |
| 1362 | * Peer Rwnd : Current calculated value of the peer's rwnd. |
| 1363 | */ |
| 1364 | __u32 rwnd; |
| 1365 | |
| 1366 | /* transport_addr_list |
| 1367 | * |
| 1368 | * Peer : A list of SCTP transport addresses that the |
| 1369 | * Transport : peer is bound to. This information is derived |
| 1370 | * Address : from the INIT or INIT ACK and is used to |
| 1371 | * List : associate an inbound packet with a given |
| 1372 | * : association. Normally this information is |
| 1373 | * : hashed or keyed for quick lookup and access |
| 1374 | * : of the TCB. |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1375 | * : The list is also initialized with the list |
| 1376 | * : of addresses passed with the sctp_connectx() |
| 1377 | * : call. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | * |
| 1379 | * It is a list of SCTP_transport's. |
| 1380 | */ |
| 1381 | struct list_head transport_addr_list; |
| 1382 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1383 | /* transport_count |
| 1384 | * |
| 1385 | * Peer : A count of the number of peer addresses |
| 1386 | * Transport : in the Peer Transport Address List. |
| 1387 | * Address : |
| 1388 | * Count : |
| 1389 | */ |
| 1390 | __u16 transport_count; |
| 1391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | /* port |
| 1393 | * The transport layer port number. |
| 1394 | */ |
| 1395 | __u16 port; |
| 1396 | |
| 1397 | /* primary_path |
| 1398 | * |
| 1399 | * Primary : This is the current primary destination |
| 1400 | * Path : transport address of the peer endpoint. It |
| 1401 | * : may also specify a source transport address |
| 1402 | * : on this endpoint. |
| 1403 | * |
| 1404 | * All of these paths live on transport_addr_list. |
| 1405 | * |
| 1406 | * At the bakeoffs, we discovered that the intent of |
| 1407 | * primaryPath is that it only changes when the ULP |
| 1408 | * asks to have it changed. We add the activePath to |
| 1409 | * designate the connection we are currently using to |
| 1410 | * transmit new data and most control chunks. |
| 1411 | */ |
| 1412 | struct sctp_transport *primary_path; |
| 1413 | |
| 1414 | /* Cache the primary path address here, when we |
| 1415 | * need a an address for msg_name. |
| 1416 | */ |
| 1417 | union sctp_addr primary_addr; |
| 1418 | |
| 1419 | /* active_path |
| 1420 | * The path that we are currently using to |
| 1421 | * transmit new data and most control chunks. |
| 1422 | */ |
| 1423 | struct sctp_transport *active_path; |
| 1424 | |
| 1425 | /* retran_path |
| 1426 | * |
| 1427 | * RFC2960 6.4 Multi-homed SCTP Endpoints |
| 1428 | * ... |
| 1429 | * Furthermore, when its peer is multi-homed, an |
| 1430 | * endpoint SHOULD try to retransmit a chunk to an |
| 1431 | * active destination transport address that is |
| 1432 | * different from the last destination address to |
| 1433 | * which the DATA chunk was sent. |
| 1434 | */ |
| 1435 | struct sctp_transport *retran_path; |
| 1436 | |
| 1437 | /* Pointer to last transport I have sent on. */ |
| 1438 | struct sctp_transport *last_sent_to; |
| 1439 | |
| 1440 | /* This is the last transport I have received DATA on. */ |
| 1441 | struct sctp_transport *last_data_from; |
| 1442 | |
| 1443 | /* |
| 1444 | * Mapping An array of bits or bytes indicating which out of |
| 1445 | * Array order TSN's have been received (relative to the |
| 1446 | * Last Rcvd TSN). If no gaps exist, i.e. no out of |
| 1447 | * order packets have been received, this array |
| 1448 | * will be set to all zero. This structure may be |
| 1449 | * in the form of a circular buffer or bit array. |
| 1450 | * |
| 1451 | * Last Rcvd : This is the last TSN received in |
| 1452 | * TSN : sequence. This value is set initially by |
| 1453 | * : taking the peer's Initial TSN, received in |
| 1454 | * : the INIT or INIT ACK chunk, and subtracting |
| 1455 | * : one from it. |
| 1456 | * |
| 1457 | * Throughout most of the specification this is called the |
| 1458 | * "Cumulative TSN ACK Point". In this case, we |
| 1459 | * ignore the advice in 12.2 in favour of the term |
| 1460 | * used in the bulk of the text. This value is hidden |
| 1461 | * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). |
| 1462 | */ |
| 1463 | struct sctp_tsnmap tsn_map; |
| 1464 | __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; |
| 1465 | |
| 1466 | /* Ack State : This flag indicates if the next received |
| 1467 | * : packet is to be responded to with a |
| 1468 | * : SACK. This is initializedto 0. When a packet |
| 1469 | * : is received it is incremented. If this value |
| 1470 | * : reaches 2 or more, a SACK is sent and the |
| 1471 | * : value is reset to 0. Note: This is used only |
| 1472 | * : when no DATA chunks are received out of |
| 1473 | * : order. When DATA chunks are out of order, |
| 1474 | * : SACK's are not delayed (see Section 6). |
| 1475 | */ |
| 1476 | __u8 sack_needed; /* Do we need to sack the peer? */ |
| 1477 | |
| 1478 | /* These are capabilities which our peer advertised. */ |
| 1479 | __u8 ecn_capable; /* Can peer do ECN? */ |
| 1480 | __u8 ipv4_address; /* Peer understands IPv4 addresses? */ |
| 1481 | __u8 ipv6_address; /* Peer understands IPv6 addresses? */ |
| 1482 | __u8 hostname_address;/* Peer understands DNS addresses? */ |
| 1483 | __u8 asconf_capable; /* Does peer support ADDIP? */ |
| 1484 | __u8 prsctp_capable; /* Can peer do PR-SCTP? */ |
| 1485 | |
| 1486 | __u32 adaption_ind; /* Adaption Code point. */ |
| 1487 | |
| 1488 | /* This mask is used to disable sending the ASCONF chunk |
| 1489 | * with specified parameter to peer. |
| 1490 | */ |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 1491 | __be16 addip_disabled_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | |
Al Viro | e1857ea | 2006-11-20 17:25:32 -0800 | [diff] [blame] | 1493 | struct sctp_inithdr_host i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | int cookie_len; |
| 1495 | void *cookie; |
| 1496 | |
| 1497 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. |
| 1498 | * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the |
| 1499 | * Initial TSN Value minus 1 |
| 1500 | */ |
| 1501 | __u32 addip_serial; |
| 1502 | } peer; |
| 1503 | |
| 1504 | /* State : A state variable indicating what state the |
| 1505 | * : association is in, i.e. COOKIE-WAIT, |
| 1506 | * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, |
| 1507 | * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. |
| 1508 | * |
| 1509 | * Note: No "CLOSED" state is illustrated since if a |
| 1510 | * association is "CLOSED" its TCB SHOULD be removed. |
| 1511 | * |
| 1512 | * In this implementation we DO have a CLOSED |
| 1513 | * state which is used during initiation and shutdown. |
| 1514 | * |
| 1515 | * State takes values from SCTP_STATE_*. |
| 1516 | */ |
| 1517 | sctp_state_t state; |
| 1518 | |
| 1519 | /* The cookie life I award for any cookie. */ |
| 1520 | struct timeval cookie_life; |
| 1521 | |
| 1522 | /* Overall : The overall association error count. |
| 1523 | * Error Count : [Clear this any time I get something.] |
| 1524 | */ |
| 1525 | int overall_error_count; |
| 1526 | |
| 1527 | /* These are the association's initial, max, and min RTO values. |
| 1528 | * These values will be initialized by system defaults, but can |
| 1529 | * be modified via the SCTP_RTOINFO socket option. |
| 1530 | */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1531 | unsigned long rto_initial; |
| 1532 | unsigned long rto_max; |
| 1533 | unsigned long rto_min; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | |
| 1535 | /* Maximum number of new data packets that can be sent in a burst. */ |
| 1536 | int max_burst; |
| 1537 | |
| 1538 | /* This is the max_retrans value for the association. This value will |
| 1539 | * be initialized initialized from system defaults, but can be |
| 1540 | * modified by the SCTP_ASSOCINFO socket option. |
| 1541 | */ |
| 1542 | int max_retrans; |
| 1543 | |
| 1544 | /* Maximum number of times the endpoint will retransmit INIT */ |
| 1545 | __u16 max_init_attempts; |
| 1546 | |
| 1547 | /* How many times have we resent an INIT? */ |
| 1548 | __u16 init_retries; |
| 1549 | |
| 1550 | /* The largest timeout or RTO value to use in attempting an INIT */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1551 | unsigned long max_init_timeo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1553 | /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
| 1554 | * the destination address every heartbeat interval. This value |
| 1555 | * will be inherited by all new transports. |
| 1556 | */ |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1557 | unsigned long hbinterval; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1558 | |
| 1559 | /* This is the max_retrans value for new transports in the |
| 1560 | * association. |
| 1561 | */ |
| 1562 | __u16 pathmaxrxt; |
| 1563 | |
| 1564 | /* Association : The smallest PMTU discovered for all of the |
| 1565 | * PMTU : peer's transport addresses. |
| 1566 | */ |
| 1567 | __u32 pathmtu; |
| 1568 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1569 | /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */ |
| 1570 | __u32 param_flags; |
| 1571 | |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1572 | /* SACK delay timeout */ |
| 1573 | unsigned long sackdelay; |
| 1574 | |
| 1575 | |
| 1576 | unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; |
| 1578 | |
| 1579 | /* Transport to which SHUTDOWN chunk was last sent. */ |
| 1580 | struct sctp_transport *shutdown_last_sent_to; |
| 1581 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1582 | /* Transport to which INIT chunk was last sent. */ |
| 1583 | struct sctp_transport *init_last_sent_to; |
| 1584 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | /* Next TSN : The next TSN number to be assigned to a new |
| 1586 | * : DATA chunk. This is sent in the INIT or INIT |
| 1587 | * : ACK chunk to the peer and incremented each |
| 1588 | * : time a DATA chunk is assigned a TSN |
| 1589 | * : (normally just prior to transmit or during |
| 1590 | * : fragmentation). |
| 1591 | */ |
| 1592 | __u32 next_tsn; |
| 1593 | |
| 1594 | /* |
| 1595 | * Last Rcvd : This is the last TSN received in sequence. This value |
| 1596 | * TSN : is set initially by taking the peer's Initial TSN, |
| 1597 | * : received in the INIT or INIT ACK chunk, and |
| 1598 | * : subtracting one from it. |
| 1599 | * |
| 1600 | * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. |
| 1601 | */ |
| 1602 | |
| 1603 | __u32 ctsn_ack_point; |
| 1604 | |
| 1605 | /* PR-SCTP Advanced.Peer.Ack.Point */ |
| 1606 | __u32 adv_peer_ack_point; |
| 1607 | |
| 1608 | /* Highest TSN that is acknowledged by incoming SACKs. */ |
| 1609 | __u32 highest_sacked; |
| 1610 | |
| 1611 | /* The number of unacknowledged data chunks. Reported through |
| 1612 | * the SCTP_STATUS sockopt. |
| 1613 | */ |
| 1614 | __u16 unack_data; |
| 1615 | |
| 1616 | /* This is the association's receive buffer space. This value is used |
| 1617 | * to set a_rwnd field in an INIT or a SACK chunk. |
| 1618 | */ |
| 1619 | __u32 rwnd; |
| 1620 | |
| 1621 | /* This is the last advertised value of rwnd over a SACK chunk. */ |
| 1622 | __u32 a_rwnd; |
| 1623 | |
| 1624 | /* Number of bytes by which the rwnd has slopped. The rwnd is allowed |
| 1625 | * to slop over a maximum of the association's frag_point. |
| 1626 | */ |
| 1627 | __u32 rwnd_over; |
| 1628 | |
| 1629 | /* This is the sndbuf size in use for the association. |
| 1630 | * This corresponds to the sndbuf size for the association, |
| 1631 | * as specified in the sk->sndbuf. |
| 1632 | */ |
| 1633 | int sndbuf_used; |
| 1634 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 1635 | /* This is the amount of memory that this association has allocated |
| 1636 | * in the receive path at any given time. |
| 1637 | */ |
| 1638 | atomic_t rmem_alloc; |
| 1639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | /* This is the wait queue head for send requests waiting on |
| 1641 | * the association sndbuf space. |
| 1642 | */ |
| 1643 | wait_queue_head_t wait; |
| 1644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | /* The message size at which SCTP fragmentation will occur. */ |
| 1646 | __u32 frag_point; |
| 1647 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1648 | /* Counter used to count INIT errors. */ |
| 1649 | int init_err_counter; |
| 1650 | |
| 1651 | /* Count the number of INIT cycles (for doubling timeout). */ |
| 1652 | int init_cycle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | |
| 1654 | /* Default send parameters. */ |
| 1655 | __u16 default_stream; |
| 1656 | __u16 default_flags; |
| 1657 | __u32 default_ppid; |
| 1658 | __u32 default_context; |
| 1659 | __u32 default_timetolive; |
| 1660 | |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame^] | 1661 | /* Default receive parameters */ |
| 1662 | __u32 default_rcv_context; |
| 1663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | /* This tracks outbound ssn for a given stream. */ |
| 1665 | struct sctp_ssnmap *ssnmap; |
| 1666 | |
| 1667 | /* All outbound chunks go through this structure. */ |
| 1668 | struct sctp_outq outqueue; |
| 1669 | |
| 1670 | /* A smart pipe that will handle reordering and fragmentation, |
| 1671 | * as well as handle passing events up to the ULP. |
| 1672 | */ |
| 1673 | struct sctp_ulpq ulpq; |
| 1674 | |
| 1675 | /* Last TSN that caused an ECNE Chunk to be sent. */ |
| 1676 | __u32 last_ecne_tsn; |
| 1677 | |
| 1678 | /* Last TSN that caused a CWR Chunk to be sent. */ |
| 1679 | __u32 last_cwr_tsn; |
| 1680 | |
| 1681 | /* How many duplicated TSNs have we seen? */ |
| 1682 | int numduptsns; |
| 1683 | |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1684 | /* Number of seconds of idle time before an association is closed. |
| 1685 | * In the association context, this is really used as a boolean |
| 1686 | * since the real timeout is stored in the timeouts array |
| 1687 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | __u32 autoclose; |
| 1689 | |
| 1690 | /* These are to support |
| 1691 | * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses |
| 1692 | * and Enforcement of Flow and Message Limits" |
| 1693 | * <draft-ietf-tsvwg-addip-sctp-02.txt> |
| 1694 | * or "ADDIP" for short. |
| 1695 | */ |
| 1696 | |
| 1697 | |
| 1698 | |
| 1699 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks |
| 1700 | * |
| 1701 | * R1) One and only one ASCONF Chunk MAY be in transit and |
| 1702 | * unacknowledged at any one time. If a sender, after sending |
| 1703 | * an ASCONF chunk, decides it needs to transfer another |
| 1704 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk |
| 1705 | * returns from the previous ASCONF Chunk before sending a |
| 1706 | * subsequent ASCONF. Note this restriction binds each side, |
| 1707 | * so at any time two ASCONF may be in-transit on any given |
| 1708 | * association (one sent from each endpoint). |
| 1709 | * |
| 1710 | * [This is our one-and-only-one ASCONF in flight. If we do |
| 1711 | * not have an ASCONF in flight, this is NULL.] |
| 1712 | */ |
| 1713 | struct sctp_chunk *addip_last_asconf; |
| 1714 | |
| 1715 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. |
| 1716 | * |
| 1717 | * IMPLEMENTATION NOTE: As an optimization a receiver may wish |
| 1718 | * to save the last ASCONF-ACK for some predetermined period |
| 1719 | * of time and instead of re-processing the ASCONF (with the |
| 1720 | * same serial number) it may just re-transmit the |
| 1721 | * ASCONF-ACK. It may wish to use the arrival of a new serial |
| 1722 | * number to discard the previously saved ASCONF-ACK or any |
| 1723 | * other means it may choose to expire the saved ASCONF-ACK. |
| 1724 | * |
| 1725 | * [This is our saved ASCONF-ACK. We invalidate it when a new |
| 1726 | * ASCONF serial number arrives.] |
| 1727 | */ |
| 1728 | struct sctp_chunk *addip_last_asconf_ack; |
| 1729 | |
| 1730 | /* These ASCONF chunks are waiting to be sent. |
| 1731 | * |
| 1732 | * These chunaks can't be pushed to outqueue until receiving |
| 1733 | * ASCONF_ACK for the previous ASCONF indicated by |
| 1734 | * addip_last_asconf, so as to guarantee that only one ASCONF |
| 1735 | * is in flight at any time. |
| 1736 | * |
| 1737 | * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks |
| 1738 | * |
| 1739 | * In defining the ASCONF Chunk transfer procedures, it is |
| 1740 | * essential that these transfers MUST NOT cause congestion |
| 1741 | * within the network. To achieve this, we place these |
| 1742 | * restrictions on the transfer of ASCONF Chunks: |
| 1743 | * |
| 1744 | * R1) One and only one ASCONF Chunk MAY be in transit and |
| 1745 | * unacknowledged at any one time. If a sender, after sending |
| 1746 | * an ASCONF chunk, decides it needs to transfer another |
| 1747 | * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk |
| 1748 | * returns from the previous ASCONF Chunk before sending a |
| 1749 | * subsequent ASCONF. Note this restriction binds each side, |
| 1750 | * so at any time two ASCONF may be in-transit on any given |
| 1751 | * association (one sent from each endpoint). |
| 1752 | * |
| 1753 | * |
| 1754 | * [I really think this is EXACTLY the sort of intelligence |
| 1755 | * which already resides in sctp_outq. Please move this |
| 1756 | * queue and its supporting logic down there. --piggy] |
| 1757 | */ |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 1758 | struct list_head addip_chunk_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
| 1760 | /* ADDIP Section 4.1 ASCONF Chunk Procedures |
| 1761 | * |
| 1762 | * A2) A serial number should be assigned to the Chunk. The |
| 1763 | * serial number SHOULD be a monotonically increasing |
| 1764 | * number. The serial number SHOULD be initialized at |
| 1765 | * the start of the association to the same value as the |
| 1766 | * Initial TSN and every time a new ASCONF chunk is created |
| 1767 | * it is incremented by one after assigning the serial number |
| 1768 | * to the newly created chunk. |
| 1769 | * |
| 1770 | * ADDIP |
| 1771 | * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) |
| 1772 | * |
| 1773 | * Serial Number : 32 bits (unsigned integer) |
| 1774 | * |
| 1775 | * This value represents a Serial Number for the ASCONF |
| 1776 | * Chunk. The valid range of Serial Number is from 0 to |
| 1777 | * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 |
| 1778 | * after reaching 4294967295. |
| 1779 | */ |
| 1780 | __u32 addip_serial; |
| 1781 | |
| 1782 | /* Need to send an ECNE Chunk? */ |
| 1783 | char need_ecne; |
| 1784 | |
| 1785 | /* Is it a temporary association? */ |
| 1786 | char temp; |
| 1787 | }; |
| 1788 | |
| 1789 | |
| 1790 | /* An eyecatcher for determining if we are really looking at an |
| 1791 | * association data structure. |
| 1792 | */ |
| 1793 | enum { |
| 1794 | SCTP_ASSOC_EYECATCHER = 0xa550c123, |
| 1795 | }; |
| 1796 | |
| 1797 | /* Recover the outter association structure. */ |
| 1798 | static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) |
| 1799 | { |
| 1800 | struct sctp_association *asoc; |
| 1801 | |
| 1802 | asoc = container_of(base, struct sctp_association, base); |
| 1803 | return asoc; |
| 1804 | } |
| 1805 | |
| 1806 | /* These are function signatures for manipulating associations. */ |
| 1807 | |
| 1808 | |
| 1809 | struct sctp_association * |
| 1810 | sctp_association_new(const struct sctp_endpoint *, const struct sock *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1811 | sctp_scope_t scope, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | void sctp_association_free(struct sctp_association *); |
| 1813 | void sctp_association_put(struct sctp_association *); |
| 1814 | void sctp_association_hold(struct sctp_association *); |
| 1815 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1816 | struct sctp_transport *sctp_assoc_choose_init_transport( |
| 1817 | struct sctp_association *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | struct sctp_transport *sctp_assoc_choose_shutdown_transport( |
| 1819 | struct sctp_association *); |
| 1820 | void sctp_assoc_update_retran_path(struct sctp_association *); |
| 1821 | struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, |
| 1822 | const union sctp_addr *); |
| 1823 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, |
| 1824 | const union sctp_addr *laddr); |
| 1825 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, |
| 1826 | const union sctp_addr *address, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1827 | const gfp_t gfp, |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1828 | const int peer_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
| 1830 | const union sctp_addr *addr); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1831 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
| 1832 | struct sctp_transport *peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | void sctp_assoc_control_transport(struct sctp_association *, |
| 1834 | struct sctp_transport *, |
| 1835 | sctp_transport_cmd_t, sctp_sn_error_t); |
| 1836 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); |
| 1837 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, |
| 1838 | const union sctp_addr *, |
| 1839 | const union sctp_addr *); |
| 1840 | void sctp_assoc_migrate(struct sctp_association *, struct sock *); |
| 1841 | void sctp_assoc_update(struct sctp_association *old, |
| 1842 | struct sctp_association *new); |
| 1843 | |
| 1844 | __u32 sctp_association_get_next_tsn(struct sctp_association *); |
| 1845 | |
| 1846 | void sctp_assoc_sync_pmtu(struct sctp_association *); |
| 1847 | void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); |
| 1848 | void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); |
| 1849 | void sctp_assoc_set_primary(struct sctp_association *, |
| 1850 | struct sctp_transport *); |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1851 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1852 | gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1854 | struct sctp_cookie*, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1855 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | |
| 1857 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, |
| 1858 | const union sctp_addr *ss2); |
| 1859 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); |
| 1860 | |
| 1861 | /* A convenience structure to parse out SCTP specific CMSGs. */ |
| 1862 | typedef struct sctp_cmsgs { |
| 1863 | struct sctp_initmsg *init; |
| 1864 | struct sctp_sndrcvinfo *info; |
| 1865 | } sctp_cmsgs_t; |
| 1866 | |
| 1867 | /* Structure for tracking memory objects */ |
| 1868 | typedef struct { |
| 1869 | char *label; |
| 1870 | atomic_t *counter; |
| 1871 | } sctp_dbg_objcnt_entry_t; |
| 1872 | |
| 1873 | #endif /* __sctp_structs_h__ */ |