1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * This SCTP implementation is free software; 10 * you can redistribute it and/or modify it under the terms of 11 * the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This SCTP implementation is distributed in the hope that it 16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 17 * ************************ 18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 19 * See the GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with GNU CC; see the file COPYING. If not, write to 23 * the Free Software Foundation, 59 Temple Place - Suite 330, 24 * Boston, MA 02111-1307, USA. 25 * 26 * Please send any bug reports or fixes you make to the 27 * email addresses: 28 * lksctp developers <lksctp-developers@lists.sourceforge.net> 29 * 30 * Or submit a bug report through the following website: 31 * http://www.sf.net/projects/lksctp 32 * 33 * Written or modified by: 34 * Randall Stewart <randall@sctp.chicago.il.us> 35 * Ken Morneau <kmorneau@cisco.com> 36 * Qiaobing Xie <qxie1@email.mot.com> 37 * La Monte H.P. Yarroll <piggy@acm.org> 38 * Karl Knutson <karl@athena.chicago.il.us> 39 * Jon Grimm <jgrimm@us.ibm.com> 40 * Xingang Guo <xingang.guo@intel.com> 41 * Hui Huang <hui.huang@nokia.com> 42 * Sridhar Samudrala <sri@us.ibm.com> 43 * Daisy Chang <daisyc@us.ibm.com> 44 * Dajiang Zhang <dajiang.zhang@nokia.com> 45 * Ardelle Fan <ardelle.fan@intel.com> 46 * Ryan Layer <rmlayer@us.ibm.com> 47 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 48 * Kevin Gao <kevin.gao@intel.com> 49 * 50 * Any bugs reported given to us we will try to fix... any fixes shared will 51 * be incorporated into the next SCTP release. 52 */ 53 54 #ifndef __sctp_structs_h__ 55 #define __sctp_structs_h__ 56 57 #include <linux/time.h> /* We get struct timespec. */ 58 #include <linux/socket.h> /* linux/in.h needs this!! */ 59 #include <linux/in.h> /* We get struct sockaddr_in. */ 60 #include <linux/in6.h> /* We get struct in6_addr */ 61 #include <linux/ipv6.h> 62 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 63 #include <asm/atomic.h> /* This gets us atomic counters. */ 64 #include <linux/skbuff.h> /* We need sk_buff_head. */ 65 #include <linux/workqueue.h> /* We need tq_struct. */ 66 #include <linux/sctp.h> /* We need sctp* header structs. */ 67 #include <net/sctp/auth.h> /* We need auth specific structs */ 68 69 /* A convenience structure for handling sockaddr structures. 70 * We should wean ourselves off this. 71 */ 72 union sctp_addr { 73 struct sockaddr_in v4; 74 struct sockaddr_in6 v6; 75 struct sockaddr sa; 76 }; 77 78 /* Forward declarations for data structures. */ 79 struct sctp_globals; 80 struct sctp_endpoint; 81 struct sctp_association; 82 struct sctp_transport; 83 struct sctp_packet; 84 struct sctp_chunk; 85 struct sctp_inq; 86 struct sctp_outq; 87 struct sctp_bind_addr; 88 struct sctp_ulpq; 89 struct sctp_ep_common; 90 struct sctp_ssnmap; 91 struct crypto_hash; 92 93 94 #include <net/sctp/tsnmap.h> 95 #include <net/sctp/ulpevent.h> 96 #include <net/sctp/ulpqueue.h> 97 98 /* Structures useful for managing bind/connect. */ 99 100 struct sctp_bind_bucket { 101 unsigned short port; 102 unsigned short fastreuse; 103 struct hlist_node node; 104 struct hlist_head owner; 105 }; 106 107 struct sctp_bind_hashbucket { 108 spinlock_t lock; 109 struct hlist_head chain; 110 }; 111 112 /* Used for hashing all associations. */ 113 struct sctp_hashbucket { 114 rwlock_t lock; 115 struct hlist_head chain; 116 } __attribute__((__aligned__(8))); 117 118 119 /* The SCTP globals structure. */ 120 extern struct sctp_globals { 121 /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values 122 * 123 * The following protocol parameters are RECOMMENDED: 124 * 125 * RTO.Initial - 3 seconds 126 * RTO.Min - 1 second 127 * RTO.Max - 60 seconds 128 * RTO.Alpha - 1/8 (3 when converted to right shifts.) 129 * RTO.Beta - 1/4 (2 when converted to right shifts.) 130 */ 131 unsigned int rto_initial; 132 unsigned int rto_min; 133 unsigned int rto_max; 134 135 /* Note: rto_alpha and rto_beta are really defined as inverse 136 * powers of two to facilitate integer operations. 137 */ 138 int rto_alpha; 139 int rto_beta; 140 141 /* Max.Burst - 4 */ 142 int max_burst; 143 144 /* Whether Cookie Preservative is enabled(1) or not(0) */ 145 int cookie_preserve_enable; 146 147 /* Valid.Cookie.Life - 60 seconds */ 148 unsigned int valid_cookie_life; 149 150 /* Delayed SACK timeout 200ms default*/ 151 unsigned int sack_timeout; 152 153 /* HB.interval - 30 seconds */ 154 unsigned int hb_interval; 155 156 /* Association.Max.Retrans - 10 attempts 157 * Path.Max.Retrans - 5 attempts (per destination address) 158 * Max.Init.Retransmits - 8 attempts 159 */ 160 int max_retrans_association; 161 int max_retrans_path; 162 int max_retrans_init; 163 164 /* 165 * Policy for preforming sctp/socket accounting 166 * 0 - do socket level accounting, all assocs share sk_sndbuf 167 * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes 168 */ 169 int sndbuf_policy; 170 171 /* 172 * Policy for preforming sctp/socket accounting 173 * 0 - do socket level accounting, all assocs share sk_rcvbuf 174 * 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes 175 */ 176 int rcvbuf_policy; 177 178 /* The following variables are implementation specific. */ 179 180 /* Default initialization values to be applied to new associations. */ 181 __u16 max_instreams; 182 __u16 max_outstreams; 183 184 /* This is a list of groups of functions for each address 185 * family that we support. 186 */ 187 struct list_head address_families; 188 189 /* This is the hash of all endpoints. */ 190 int ep_hashsize; 191 struct sctp_hashbucket *ep_hashtable; 192 193 /* This is the hash of all associations. */ 194 int assoc_hashsize; 195 struct sctp_hashbucket *assoc_hashtable; 196 197 /* This is the sctp port control hash. */ 198 int port_hashsize; 199 struct sctp_bind_hashbucket *port_hashtable; 200 201 /* This is the global local address list. 202 * We actively maintain this complete list of addresses on 203 * the system by catching address add/delete events. 204 * 205 * It is a list of sctp_sockaddr_entry. 206 */ 207 struct list_head local_addr_list; 208 209 /* Lock that protects the local_addr_list writers */ 210 spinlock_t addr_list_lock; 211 212 /* Flag to indicate if addip is enabled. */ 213 int addip_enable; 214 int addip_noauth_enable; 215 216 /* Flag to indicate if PR-SCTP is enabled. */ 217 int prsctp_enable; 218 219 /* Flag to idicate if SCTP-AUTH is enabled */ 220 int auth_enable; 221 } 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) 232 #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) 233 #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) 234 #define sctp_max_retrans_path (sctp_globals.max_retrans_path) 235 #define sctp_max_retrans_init (sctp_globals.max_retrans_init) 236 #define sctp_sack_timeout (sctp_globals.sack_timeout) 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) 250 #define sctp_local_addr_lock (sctp_globals.addr_list_lock) 251 #define sctp_addip_enable (sctp_globals.addip_enable) 252 #define sctp_addip_noauth (sctp_globals.addip_noauth_enable) 253 #define sctp_prsctp_enable (sctp_globals.prsctp_enable) 254 #define sctp_auth_enable (sctp_globals.auth_enable) 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. */ 274 struct crypto_hash *hmac; 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; 286 __u32 default_rcv_context; 287 int max_burst; 288 289 /* 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 __u32 sackfreq; 304 305 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 306 __u32 param_flags; 307 308 struct sctp_initmsg initmsg; 309 struct sctp_rtoinfo rtoinfo; 310 struct sctp_paddrparams paddrparam; 311 struct sctp_event_subscribe subscribe; 312 struct sctp_assocparams assocparams; 313 int user_frag; 314 __u32 autoclose; 315 __u8 nodelay; 316 __u8 disable_fragments; 317 __u8 v4mapped; 318 __u8 frag_interleave; 319 __u32 adaptation_ind; 320 __u32 pd_point; 321 322 atomic_t pd_mode; 323 /* Receive to here while partial delivery is in effect. */ 324 struct sk_buff_head pd_lobby; 325 }; 326 327 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 328 { 329 return (struct sctp_sock *)sk; 330 } 331 332 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 333 { 334 return (struct sock *)sp; 335 } 336 337 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 338 struct sctp6_sock { 339 struct sctp_sock sctp; 340 struct ipv6_pinfo inet6; 341 }; 342 #endif /* CONFIG_IPV6 */ 343 344 345 /* This is our APPLICATION-SPECIFIC state cookie. 346 * THIS IS NOT DICTATED BY THE SPECIFICATION. 347 */ 348 /* These are the parts of an association which we send in the cookie. 349 * Most of these are straight out of: 350 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 351 * 352 */ 353 354 struct sctp_cookie { 355 356 /* My : Tag expected in every inbound packet and sent 357 * Verification: in the INIT or INIT ACK chunk. 358 * Tag : 359 */ 360 __u32 my_vtag; 361 362 /* Peer's : Tag expected in every outbound packet except 363 * Verification: in the INIT chunk. 364 * Tag : 365 */ 366 __u32 peer_vtag; 367 368 /* The rest of these are not from the spec, but really need to 369 * be in the cookie. 370 */ 371 372 /* My Tie Tag : Assist in discovering a restarting association. */ 373 __u32 my_ttag; 374 375 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 376 __u32 peer_ttag; 377 378 /* When does this cookie expire? */ 379 struct timeval expiration; 380 381 /* Number of inbound/outbound streams which are set 382 * and negotiated during the INIT process. 383 */ 384 __u16 sinit_num_ostreams; 385 __u16 sinit_max_instreams; 386 387 /* This is the first sequence number I used. */ 388 __u32 initial_tsn; 389 390 /* This holds the originating address of the INIT packet. */ 391 union sctp_addr peer_addr; 392 393 /* IG Section 2.35.3 394 * Include the source port of the INIT-ACK 395 */ 396 __u16 my_port; 397 398 __u8 prsctp_capable; 399 400 /* Padding for future use */ 401 __u8 padding; 402 403 __u32 adaptation_ind; 404 405 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 406 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 407 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 408 409 /* This is a shim for my peer's INIT packet, followed by 410 * a copy of the raw address list of the association. 411 * The length of the raw address list is saved in the 412 * raw_addr_list_len field, which will be used at the time when 413 * the association TCB is re-constructed from the cookie. 414 */ 415 __u32 raw_addr_list_len; 416 struct sctp_init_chunk peer_init[0]; 417 }; 418 419 420 /* The format of our cookie that we send to our peer. */ 421 struct sctp_signed_cookie { 422 __u8 signature[SCTP_SECRET_SIZE]; 423 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 424 struct sctp_cookie c; 425 } __attribute__((packed)); 426 427 /* This is another convenience type to allocate memory for address 428 * params for the maximum size and pass such structures around 429 * internally. 430 */ 431 union sctp_addr_param { 432 struct sctp_paramhdr p; 433 struct sctp_ipv4addr_param v4; 434 struct sctp_ipv6addr_param v6; 435 }; 436 437 /* A convenience type to allow walking through the various 438 * parameters and avoid casting all over the place. 439 */ 440 union sctp_params { 441 void *v; 442 struct sctp_paramhdr *p; 443 struct sctp_cookie_preserve_param *life; 444 struct sctp_hostname_param *dns; 445 struct sctp_cookie_param *cookie; 446 struct sctp_supported_addrs_param *sat; 447 struct sctp_ipv4addr_param *v4; 448 struct sctp_ipv6addr_param *v6; 449 union sctp_addr_param *addr; 450 struct sctp_adaptation_ind_param *aind; 451 struct sctp_supported_ext_param *ext; 452 struct sctp_random_param *random; 453 struct sctp_chunks_param *chunks; 454 struct sctp_hmac_algo_param *hmac_algo; 455 struct sctp_addip_param *addip; 456 }; 457 458 /* RFC 2960. Section 3.3.5 Heartbeat. 459 * Heartbeat Information: variable length 460 * The Sender-specific Heartbeat Info field should normally include 461 * information about the sender's current time when this HEARTBEAT 462 * chunk is sent and the destination transport address to which this 463 * HEARTBEAT is sent (see Section 8.3). 464 */ 465 typedef struct sctp_sender_hb_info { 466 struct sctp_paramhdr param_hdr; 467 union sctp_addr daddr; 468 unsigned long sent_at; 469 __u64 hb_nonce; 470 } __attribute__((packed)) sctp_sender_hb_info_t; 471 472 /* 473 * RFC 2960 1.3.2 Sequenced Delivery within Streams 474 * 475 * The term "stream" is used in SCTP to refer to a sequence of user 476 * messages that are to be delivered to the upper-layer protocol in 477 * order with respect to other messages within the same stream. This is 478 * in contrast to its usage in TCP, where it refers to a sequence of 479 * bytes (in this document a byte is assumed to be eight bits). 480 * ... 481 * 482 * This is the structure we use to track both our outbound and inbound 483 * SSN, or Stream Sequence Numbers. 484 */ 485 486 struct sctp_stream { 487 __u16 *ssn; 488 unsigned int len; 489 }; 490 491 struct sctp_ssnmap { 492 struct sctp_stream in; 493 struct sctp_stream out; 494 int malloced; 495 }; 496 497 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 498 gfp_t gfp); 499 void sctp_ssnmap_free(struct sctp_ssnmap *map); 500 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 501 502 /* What is the current SSN number for this stream? */ 503 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 504 { 505 return stream->ssn[id]; 506 } 507 508 /* Return the next SSN number for this stream. */ 509 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 510 { 511 return stream->ssn[id]++; 512 } 513 514 /* Skip over this ssn and all below. */ 515 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 516 __u16 ssn) 517 { 518 stream->ssn[id] = ssn+1; 519 } 520 521 /* 522 * Pointers to address related SCTP functions. 523 * (i.e. things that depend on the address family.) 524 */ 525 struct sctp_af { 526 int (*sctp_xmit) (struct sk_buff *skb, 527 struct sctp_transport *); 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); 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); 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_sock *sk, 552 struct sctp_association *asoc, 553 struct dst_entry *dst, 554 union sctp_addr *daddr, 555 union sctp_addr *saddr); 556 void (*copy_addrlist) (struct list_head *, 557 struct net_device *); 558 void (*dst_saddr) (union sctp_addr *saddr, 559 struct dst_entry *dst, 560 __be16 port); 561 int (*cmp_addr) (const union sctp_addr *addr1, 562 const union sctp_addr *addr2); 563 void (*addr_copy) (union sctp_addr *dst, 564 union sctp_addr *src); 565 void (*from_skb) (union sctp_addr *, 566 struct sk_buff *skb, 567 int saddr); 568 void (*from_sk) (union sctp_addr *, 569 struct sock *sk); 570 void (*to_sk_saddr) (union sctp_addr *, 571 struct sock *sk); 572 void (*to_sk_daddr) (union sctp_addr *, 573 struct sock *sk); 574 void (*from_addr_param) (union sctp_addr *, 575 union sctp_addr_param *, 576 __be16 port, int iif); 577 int (*to_addr_param) (const union sctp_addr *, 578 union sctp_addr_param *); 579 int (*addr_valid) (union sctp_addr *, 580 struct sctp_sock *, 581 const struct sk_buff *); 582 sctp_scope_t (*scope) (union sctp_addr *); 583 void (*inaddr_any) (union sctp_addr *, __be16); 584 int (*is_any) (const union sctp_addr *); 585 int (*available) (union sctp_addr *, 586 struct sctp_sock *); 587 int (*skb_iif) (const struct sk_buff *sk); 588 int (*is_ce) (const struct sk_buff *sk); 589 void (*seq_dump_addr)(struct seq_file *seq, 590 union sctp_addr *addr); 591 void (*ecn_capable)(struct sock *sk); 592 __u16 net_header_len; 593 int sockaddr_len; 594 sa_family_t sa_family; 595 struct list_head list; 596 }; 597 598 struct sctp_af *sctp_get_af_specific(sa_family_t); 599 int sctp_register_af(struct sctp_af *); 600 601 /* Protocol family functions. */ 602 struct sctp_pf { 603 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 604 void (*skb_msgname) (struct sk_buff *, char *, int *); 605 int (*af_supported) (sa_family_t, struct sctp_sock *); 606 int (*cmp_addr) (const union sctp_addr *, 607 const union sctp_addr *, 608 struct sctp_sock *); 609 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 610 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 611 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 612 struct sock *(*create_accept_sk) (struct sock *sk, 613 struct sctp_association *asoc); 614 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 615 struct sctp_af *af; 616 }; 617 618 619 /* Structure to track chunk fragments that have been acked, but peer 620 * fragments of the same message have not. 621 */ 622 struct sctp_datamsg { 623 /* Chunks waiting to be submitted to lower layer. */ 624 struct list_head chunks; 625 /* Chunks that have been transmitted. */ 626 struct list_head track; 627 /* Reference counting. */ 628 atomic_t refcnt; 629 /* When is this message no longer interesting to the peer? */ 630 unsigned long expires_at; 631 /* Did the messenge fail to send? */ 632 int send_error; 633 char send_failed; 634 /* Control whether chunks from this message can be abandoned. */ 635 char can_abandon; 636 }; 637 638 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 639 struct sctp_sndrcvinfo *, 640 struct msghdr *, int len); 641 void sctp_datamsg_put(struct sctp_datamsg *); 642 void sctp_chunk_fail(struct sctp_chunk *, int error); 643 int sctp_chunk_abandoned(struct sctp_chunk *); 644 645 /* 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 { 654 struct list_head list; 655 656 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; 693 struct sctp_authhdr *auth_hdr; 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; 726 727 /* 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; 733 734 __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? */ 743 __s8 fast_retransmit; /* Is this chunk fast retransmitted? */ 744 __u8 tsn_missing_report; /* Data chunk missing counter. */ 745 __u8 data_accepted; /* At least 1 chunk in this packet accepted */ 746 __u8 auth; /* IN: was auth'ed | OUT: needs auth */ 747 __u8 has_asconf; /* IN: have seen an asconf before */ 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); 762 763 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 }; 768 769 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 770 struct sctp_sockaddr_entry { 771 struct list_head list; 772 struct rcu_head rcu; 773 union sctp_addr a; 774 __u8 state; 775 __u8 valid; 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. */ 790 struct list_head chunk_list; 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; 802 803 /* pointer to the auth chunk for this packet */ 804 struct sctp_chunk *auth; 805 806 /* This packet contains a COOKIE-ECHO chunk. */ 807 __u8 has_cookie_echo; 808 809 /* This packet contains a SACK chunk. */ 810 __u8 has_sack; 811 812 /* This packet contains an AUTH chunk */ 813 __u8 has_auth; 814 815 /* This packet contains at least 1 DATA chunk */ 816 __u8 has_data; 817 818 /* SCTP cannot fragment this packet. So let ip fragment it. */ 819 __u8 ipfragok; 820 821 __u8 malloced; 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 *, int); 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 */ 885 /* RTO : The current retransmission timeout value. */ 886 unsigned long rto; 887 unsigned long last_rto; 888 889 __u32 rtt; /* This is the most recent RTT. */ 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 __u8 rto_pending; 907 908 /* Flag to track the current fast recovery state */ 909 __u8 fast_recovery; 910 911 /* 912 * These are the congestion stats. 913 */ 914 /* cwnd : The current congestion window. */ 915 __u32 cwnd; /* This is the actual cwnd. */ 916 917 /* ssthresh : The current slow start threshold value. */ 918 __u32 ssthresh; 919 920 /* partial : The tracking method for increase of cwnd when in 921 * bytes acked : congestion avoidance mode (see Section 6.2.2) 922 */ 923 __u32 partial_bytes_acked; 924 925 /* Data that has been sent, but not acknowledged. */ 926 __u32 flight_size; 927 928 /* TSN marking the fast recovery exit point */ 929 __u32 fast_recovery_exit; 930 931 /* Destination */ 932 struct dst_entry *dst; 933 /* Source address. */ 934 union sctp_addr saddr; 935 936 /* When was the last time(in jiffies) that a data packet was sent on 937 * this transport? This is used to adjust the cwnd when the transport 938 * becomes inactive. 939 */ 940 unsigned long last_time_used; 941 942 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 943 * the destination address every heartbeat interval. 944 */ 945 unsigned long hbinterval; 946 947 /* SACK delay timeout */ 948 unsigned long sackdelay; 949 __u32 sackfreq; 950 951 /* When was the last time (in jiffies) that we heard from this 952 * transport? We use this to pick new active and retran paths. 953 */ 954 unsigned long last_time_heard; 955 956 /* Last time(in jiffies) when cwnd is reduced due to the congestion 957 * indication based on ECNE chunk. 958 */ 959 unsigned long last_time_ecne_reduced; 960 961 /* This is the max_retrans value for the transport and will 962 * be initialized from the assocs value. This can be changed 963 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 964 */ 965 __u16 pathmaxrxt; 966 967 /* is the Path MTU update pending on this tranport */ 968 __u8 pmtu_pending; 969 970 /* PMTU : The current known path MTU. */ 971 __u32 pathmtu; 972 973 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 974 __u32 param_flags; 975 976 /* The number of times INIT has been sent on this transport. */ 977 int init_sent_count; 978 979 /* state : The current state of this destination, 980 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. 981 */ 982 int state; 983 984 /* These are the error stats for this destination. */ 985 986 /* Error count : The current error count for this destination. */ 987 unsigned short error_count; 988 989 /* Per : A timer used by each destination. 990 * Destination : 991 * Timer : 992 * 993 * [Everywhere else in the text this is called T3-rtx. -ed] 994 */ 995 struct timer_list T3_rtx_timer; 996 997 /* Heartbeat timer is per destination. */ 998 struct timer_list hb_timer; 999 1000 /* Since we're using per-destination retransmission timers 1001 * (see above), we're also using per-destination "transmitted" 1002 * queues. This probably ought to be a private struct 1003 * accessible only within the outqueue, but it's not, yet. 1004 */ 1005 struct list_head transmitted; 1006 1007 /* We build bundle-able packets for this transport here. */ 1008 struct sctp_packet packet; 1009 1010 /* This is the list of transports that have chunks to send. */ 1011 struct list_head send_ready; 1012 1013 int malloced; /* Is this structure kfree()able? */ 1014 1015 /* State information saved for SFR_CACC algorithm. The key 1016 * idea in SFR_CACC is to maintain state at the sender on a 1017 * per-destination basis when a changeover happens. 1018 * char changeover_active; 1019 * char cycling_changeover; 1020 * __u32 next_tsn_at_change; 1021 * char cacc_saw_newack; 1022 */ 1023 struct { 1024 /* An unsigned integer, which stores the next TSN to be 1025 * used by the sender, at the moment of changeover. 1026 */ 1027 __u32 next_tsn_at_change; 1028 1029 /* A flag which indicates the occurrence of a changeover */ 1030 char changeover_active; 1031 1032 /* A flag which indicates whether the change of primary is 1033 * the first switch to this destination address during an 1034 * active switch. 1035 */ 1036 char cycling_changeover; 1037 1038 /* A temporary flag, which is used during the processing of 1039 * a SACK to estimate the causative TSN(s)'s group. 1040 */ 1041 char cacc_saw_newack; 1042 } cacc; 1043 1044 /* 64-bit random number sent with heartbeat. */ 1045 __u64 hb_nonce; 1046 }; 1047 1048 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1049 gfp_t); 1050 void sctp_transport_set_owner(struct sctp_transport *, 1051 struct sctp_association *); 1052 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1053 struct sctp_sock *); 1054 void sctp_transport_pmtu(struct sctp_transport *); 1055 void sctp_transport_free(struct sctp_transport *); 1056 void sctp_transport_reset_timers(struct sctp_transport *, int); 1057 void sctp_transport_hold(struct sctp_transport *); 1058 void sctp_transport_put(struct sctp_transport *); 1059 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1060 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1061 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1062 unsigned long sctp_transport_timeout(struct sctp_transport *); 1063 void sctp_transport_reset(struct sctp_transport *); 1064 void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1065 1066 1067 /* This is the structure we use to queue packets as they come into 1068 * SCTP. We write packets to it and read chunks from it. 1069 */ 1070 struct sctp_inq { 1071 /* This is actually a queue of sctp_chunk each 1072 * containing a partially decoded packet. 1073 */ 1074 struct list_head in_chunk_list; 1075 /* This is the packet which is currently off the in queue and is 1076 * being worked on through the inbound chunk processing. 1077 */ 1078 struct sctp_chunk *in_progress; 1079 1080 /* This is the delayed task to finish delivering inbound 1081 * messages. 1082 */ 1083 struct work_struct immediate; 1084 1085 int malloced; /* Is this structure kfree()able? */ 1086 }; 1087 1088 void sctp_inq_init(struct sctp_inq *); 1089 void sctp_inq_free(struct sctp_inq *); 1090 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1091 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1092 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1093 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1094 1095 /* This is the structure we use to hold outbound chunks. You push 1096 * chunks in and they automatically pop out the other end as bundled 1097 * packets (it calls (*output_handler)()). 1098 * 1099 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1100 * and 8.2 of the v13 draft. 1101 * 1102 * It handles retransmissions. The connection to the timeout portion 1103 * of the state machine is through sctp_..._timeout() and timeout_handler. 1104 * 1105 * If you feed it SACKs, it will eat them. 1106 * 1107 * If you give it big chunks, it will fragment them. 1108 * 1109 * It assigns TSN's to data chunks. This happens at the last possible 1110 * instant before transmission. 1111 * 1112 * When free()'d, it empties itself out via output_handler(). 1113 */ 1114 struct sctp_outq { 1115 struct sctp_association *asoc; 1116 1117 /* Data pending that has never been transmitted. */ 1118 struct list_head out_chunk_list; 1119 1120 unsigned out_qlen; /* Total length of queued data chunks. */ 1121 1122 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1123 unsigned error; 1124 1125 /* These are control chunks we want to send. */ 1126 struct list_head control_chunk_list; 1127 1128 /* These are chunks that have been sacked but are above the 1129 * CTSN, or cumulative tsn ack point. 1130 */ 1131 struct list_head sacked; 1132 1133 /* Put chunks on this list to schedule them for 1134 * retransmission. 1135 */ 1136 struct list_head retransmit; 1137 1138 /* Put chunks on this list to save them for FWD TSN processing as 1139 * they were abandoned. 1140 */ 1141 struct list_head abandoned; 1142 1143 /* How many unackd bytes do we have in-flight? */ 1144 __u32 outstanding_bytes; 1145 1146 /* Are we doing fast-rtx on this queue */ 1147 char fast_rtx; 1148 1149 /* Corked? */ 1150 char cork; 1151 1152 /* Is this structure empty? */ 1153 char empty; 1154 1155 /* Are we kfree()able? */ 1156 char malloced; 1157 }; 1158 1159 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1160 void sctp_outq_teardown(struct sctp_outq *); 1161 void sctp_outq_free(struct sctp_outq*); 1162 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1163 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1164 int sctp_outq_is_empty(const struct sctp_outq *); 1165 void sctp_outq_restart(struct sctp_outq *); 1166 1167 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1168 sctp_retransmit_reason_t); 1169 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1170 int sctp_outq_uncork(struct sctp_outq *); 1171 /* Uncork and flush an outqueue. */ 1172 static inline void sctp_outq_cork(struct sctp_outq *q) 1173 { 1174 q->cork = 1; 1175 } 1176 1177 /* These bind address data fields common between endpoints and associations */ 1178 struct sctp_bind_addr { 1179 1180 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1181 * 1182 * SCTP Port: The local SCTP port number the endpoint is 1183 * bound to. 1184 */ 1185 __u16 port; 1186 1187 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1188 * 1189 * Address List: The list of IP addresses that this instance 1190 * has bound. This information is passed to one's 1191 * peer(s) in INIT and INIT ACK chunks. 1192 */ 1193 struct list_head address_list; 1194 1195 int malloced; /* Are we kfree()able? */ 1196 }; 1197 1198 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1199 void sctp_bind_addr_free(struct sctp_bind_addr *); 1200 int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1201 const struct sctp_bind_addr *src, 1202 sctp_scope_t scope, gfp_t gfp, 1203 int flags); 1204 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1205 const struct sctp_bind_addr *src, 1206 gfp_t gfp); 1207 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1208 __u8 addr_state, gfp_t gfp); 1209 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1210 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1211 struct sctp_sock *); 1212 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1213 struct sctp_sock *, struct sctp_sock *); 1214 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1215 const union sctp_addr *addr); 1216 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1217 const union sctp_addr *addrs, 1218 int addrcnt, 1219 struct sctp_sock *opt); 1220 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1221 int *addrs_len, 1222 gfp_t gfp); 1223 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1224 __u16 port, gfp_t gfp); 1225 1226 sctp_scope_t sctp_scope(const union sctp_addr *); 1227 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1228 int sctp_is_any(const union sctp_addr *addr); 1229 int sctp_addr_is_valid(const union sctp_addr *addr); 1230 1231 1232 /* What type of endpoint? */ 1233 typedef enum { 1234 SCTP_EP_TYPE_SOCKET, 1235 SCTP_EP_TYPE_ASSOCIATION, 1236 } sctp_endpoint_type_t; 1237 1238 /* 1239 * A common base class to bridge the implmentation view of a 1240 * socket (usually listening) endpoint versus an association's 1241 * local endpoint. 1242 * This common structure is useful for several purposes: 1243 * 1) Common interface for lookup routines. 1244 * a) Subfunctions work for either endpoint or association 1245 * b) Single interface to lookup allows hiding the lookup lock rather 1246 * than acquiring it externally. 1247 * 2) Common interface for the inbound chunk handling/state machine. 1248 * 3) Common object handling routines for reference counting, etc. 1249 * 4) Disentangle association lookup from endpoint lookup, where we 1250 * do not have to find our endpoint to find our association. 1251 * 1252 */ 1253 1254 struct sctp_ep_common { 1255 /* Fields to help us manage our entries in the hash tables. */ 1256 struct hlist_node node; 1257 int hashent; 1258 1259 /* Runtime type information. What kind of endpoint is this? */ 1260 sctp_endpoint_type_t type; 1261 1262 /* Some fields to help us manage this object. 1263 * refcnt - Reference count access to this object. 1264 * dead - Do not attempt to use this object. 1265 * malloced - Do we need to kfree this object? 1266 */ 1267 atomic_t refcnt; 1268 char dead; 1269 char malloced; 1270 1271 /* What socket does this endpoint belong to? */ 1272 struct sock *sk; 1273 1274 /* This is where we receive inbound chunks. */ 1275 struct sctp_inq inqueue; 1276 1277 /* This substructure includes the defining parameters of the 1278 * endpoint: 1279 * bind_addr.port is our shared port number. 1280 * bind_addr.address_list is our set of local IP addresses. 1281 */ 1282 struct sctp_bind_addr bind_addr; 1283 }; 1284 1285 1286 /* RFC Section 1.4 Key Terms 1287 * 1288 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1289 * multi-homed host, an SCTP endpoint is represented to its peers as a 1290 * combination of a set of eligible destination transport addresses to 1291 * which SCTP packets can be sent and a set of eligible source 1292 * transport addresses from which SCTP packets can be received. 1293 * All transport addresses used by an SCTP endpoint must use the 1294 * same port number, but can use multiple IP addresses. A transport 1295 * address used by an SCTP endpoint must not be used by another 1296 * SCTP endpoint. In other words, a transport address is unique 1297 * to an SCTP endpoint. 1298 * 1299 * From an implementation perspective, each socket has one of these. 1300 * A TCP-style socket will have exactly one association on one of 1301 * these. An UDP-style socket will have multiple associations hanging 1302 * off one of these. 1303 */ 1304 1305 struct sctp_endpoint { 1306 /* Common substructure for endpoint and association. */ 1307 struct sctp_ep_common base; 1308 1309 /* Associations: A list of current associations and mappings 1310 * to the data consumers for each association. This 1311 * may be in the form of a hash table or other 1312 * implementation dependent structure. The data 1313 * consumers may be process identification 1314 * information such as file descriptors, named pipe 1315 * pointer, or table pointers dependent on how SCTP 1316 * is implemented. 1317 */ 1318 /* This is really a list of struct sctp_association entries. */ 1319 struct list_head asocs; 1320 1321 /* Secret Key: A secret key used by this endpoint to compute 1322 * the MAC. This SHOULD be a cryptographic quality 1323 * random number with a sufficient length. 1324 * Discussion in [RFC1750] can be helpful in 1325 * selection of the key. 1326 */ 1327 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1328 int current_key; 1329 int last_key; 1330 int key_changed_at; 1331 1332 /* digest: This is a digest of the sctp cookie. This field is 1333 * only used on the receive path when we try to validate 1334 * that the cookie has not been tampered with. We put 1335 * this here so we pre-allocate this once and can re-use 1336 * on every receive. 1337 */ 1338 __u8 *digest; 1339 1340 /* sendbuf acct. policy. */ 1341 __u32 sndbuf_policy; 1342 1343 /* rcvbuf acct. policy. */ 1344 __u32 rcvbuf_policy; 1345 1346 /* SCTP AUTH: array of the HMACs that will be allocated 1347 * we need this per association so that we don't serialize 1348 */ 1349 struct crypto_hash **auth_hmacs; 1350 1351 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1352 struct sctp_hmac_algo_param *auth_hmacs_list; 1353 1354 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1355 struct sctp_chunks_param *auth_chunk_list; 1356 1357 /* SCTP-AUTH: endpoint shared keys */ 1358 struct list_head endpoint_shared_keys; 1359 __u16 active_key_id; 1360 }; 1361 1362 /* Recover the outter endpoint structure. */ 1363 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1364 { 1365 struct sctp_endpoint *ep; 1366 1367 ep = container_of(base, struct sctp_endpoint, base); 1368 return ep; 1369 } 1370 1371 /* These are function signatures for manipulating endpoints. */ 1372 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1373 void sctp_endpoint_free(struct sctp_endpoint *); 1374 void sctp_endpoint_put(struct sctp_endpoint *); 1375 void sctp_endpoint_hold(struct sctp_endpoint *); 1376 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1377 struct sctp_association *sctp_endpoint_lookup_assoc( 1378 const struct sctp_endpoint *ep, 1379 const union sctp_addr *paddr, 1380 struct sctp_transport **); 1381 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1382 const union sctp_addr *); 1383 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1384 const union sctp_addr *); 1385 int sctp_has_association(const union sctp_addr *laddr, 1386 const union sctp_addr *paddr); 1387 1388 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1389 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1390 struct sctp_chunk **err_chunk); 1391 int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1392 const union sctp_addr *peer, 1393 sctp_init_chunk_t *init, gfp_t gfp); 1394 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1395 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1396 1397 struct sctp_inithdr_host { 1398 __u32 init_tag; 1399 __u32 a_rwnd; 1400 __u16 num_outbound_streams; 1401 __u16 num_inbound_streams; 1402 __u32 initial_tsn; 1403 }; 1404 1405 /* RFC2960 1406 * 1407 * 12. Recommended Transmission Control Block (TCB) Parameters 1408 * 1409 * This section details a recommended set of parameters that should 1410 * be contained within the TCB for an implementation. This section is 1411 * for illustrative purposes and should not be deemed as requirements 1412 * on an implementation or as an exhaustive list of all parameters 1413 * inside an SCTP TCB. Each implementation may need its own additional 1414 * parameters for optimization. 1415 */ 1416 1417 1418 /* Here we have information about each individual association. */ 1419 struct sctp_association { 1420 1421 /* A base structure common to endpoint and association. 1422 * In this context, it represents the associations's view 1423 * of the local endpoint of the association. 1424 */ 1425 struct sctp_ep_common base; 1426 1427 /* Associations on the same socket. */ 1428 struct list_head asocs; 1429 1430 /* association id. */ 1431 sctp_assoc_t assoc_id; 1432 1433 /* This is our parent endpoint. */ 1434 struct sctp_endpoint *ep; 1435 1436 /* These are those association elements needed in the cookie. */ 1437 struct sctp_cookie c; 1438 1439 /* This is all information about our peer. */ 1440 struct { 1441 /* rwnd 1442 * 1443 * Peer Rwnd : Current calculated value of the peer's rwnd. 1444 */ 1445 __u32 rwnd; 1446 1447 /* transport_addr_list 1448 * 1449 * Peer : A list of SCTP transport addresses that the 1450 * Transport : peer is bound to. This information is derived 1451 * Address : from the INIT or INIT ACK and is used to 1452 * List : associate an inbound packet with a given 1453 * : association. Normally this information is 1454 * : hashed or keyed for quick lookup and access 1455 * : of the TCB. 1456 * : The list is also initialized with the list 1457 * : of addresses passed with the sctp_connectx() 1458 * : call. 1459 * 1460 * It is a list of SCTP_transport's. 1461 */ 1462 struct list_head transport_addr_list; 1463 1464 /* transport_count 1465 * 1466 * Peer : A count of the number of peer addresses 1467 * Transport : in the Peer Transport Address List. 1468 * Address : 1469 * Count : 1470 */ 1471 __u16 transport_count; 1472 1473 /* port 1474 * The transport layer port number. 1475 */ 1476 __u16 port; 1477 1478 /* primary_path 1479 * 1480 * Primary : This is the current primary destination 1481 * Path : transport address of the peer endpoint. It 1482 * : may also specify a source transport address 1483 * : on this endpoint. 1484 * 1485 * All of these paths live on transport_addr_list. 1486 * 1487 * At the bakeoffs, we discovered that the intent of 1488 * primaryPath is that it only changes when the ULP 1489 * asks to have it changed. We add the activePath to 1490 * designate the connection we are currently using to 1491 * transmit new data and most control chunks. 1492 */ 1493 struct sctp_transport *primary_path; 1494 1495 /* Cache the primary path address here, when we 1496 * need a an address for msg_name. 1497 */ 1498 union sctp_addr primary_addr; 1499 1500 /* active_path 1501 * The path that we are currently using to 1502 * transmit new data and most control chunks. 1503 */ 1504 struct sctp_transport *active_path; 1505 1506 /* retran_path 1507 * 1508 * RFC2960 6.4 Multi-homed SCTP Endpoints 1509 * ... 1510 * Furthermore, when its peer is multi-homed, an 1511 * endpoint SHOULD try to retransmit a chunk to an 1512 * active destination transport address that is 1513 * different from the last destination address to 1514 * which the DATA chunk was sent. 1515 */ 1516 struct sctp_transport *retran_path; 1517 1518 /* Pointer to last transport I have sent on. */ 1519 struct sctp_transport *last_sent_to; 1520 1521 /* This is the last transport I have received DATA on. */ 1522 struct sctp_transport *last_data_from; 1523 1524 /* 1525 * Mapping An array of bits or bytes indicating which out of 1526 * Array order TSN's have been received (relative to the 1527 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1528 * order packets have been received, this array 1529 * will be set to all zero. This structure may be 1530 * in the form of a circular buffer or bit array. 1531 * 1532 * Last Rcvd : This is the last TSN received in 1533 * TSN : sequence. This value is set initially by 1534 * : taking the peer's Initial TSN, received in 1535 * : the INIT or INIT ACK chunk, and subtracting 1536 * : one from it. 1537 * 1538 * Throughout most of the specification this is called the 1539 * "Cumulative TSN ACK Point". In this case, we 1540 * ignore the advice in 12.2 in favour of the term 1541 * used in the bulk of the text. This value is hidden 1542 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1543 */ 1544 struct sctp_tsnmap tsn_map; 1545 __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; 1546 1547 /* Ack State : This flag indicates if the next received 1548 * : packet is to be responded to with a 1549 * : SACK. This is initializedto 0. When a packet 1550 * : is received it is incremented. If this value 1551 * : reaches 2 or more, a SACK is sent and the 1552 * : value is reset to 0. Note: This is used only 1553 * : when no DATA chunks are received out of 1554 * : order. When DATA chunks are out of order, 1555 * : SACK's are not delayed (see Section 6). 1556 */ 1557 __u8 sack_needed; /* Do we need to sack the peer? */ 1558 __u32 sack_cnt; 1559 1560 /* These are capabilities which our peer advertised. */ 1561 __u8 ecn_capable; /* Can peer do ECN? */ 1562 __u8 ipv4_address; /* Peer understands IPv4 addresses? */ 1563 __u8 ipv6_address; /* Peer understands IPv6 addresses? */ 1564 __u8 hostname_address;/* Peer understands DNS addresses? */ 1565 __u8 asconf_capable; /* Does peer support ADDIP? */ 1566 __u8 prsctp_capable; /* Can peer do PR-SCTP? */ 1567 __u8 auth_capable; /* Is peer doing SCTP-AUTH? */ 1568 1569 __u32 adaptation_ind; /* Adaptation Code point. */ 1570 1571 /* This mask is used to disable sending the ASCONF chunk 1572 * with specified parameter to peer. 1573 */ 1574 __be16 addip_disabled_mask; 1575 1576 struct sctp_inithdr_host i; 1577 int cookie_len; 1578 void *cookie; 1579 1580 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1581 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1582 * Initial TSN Value minus 1 1583 */ 1584 __u32 addip_serial; 1585 1586 /* SCTP-AUTH: We need to know pears random number, hmac list 1587 * and authenticated chunk list. All that is part of the 1588 * cookie and these are just pointers to those locations 1589 */ 1590 sctp_random_param_t *peer_random; 1591 sctp_chunks_param_t *peer_chunks; 1592 sctp_hmac_algo_param_t *peer_hmacs; 1593 } peer; 1594 1595 /* State : A state variable indicating what state the 1596 * : association is in, i.e. COOKIE-WAIT, 1597 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1598 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1599 * 1600 * Note: No "CLOSED" state is illustrated since if a 1601 * association is "CLOSED" its TCB SHOULD be removed. 1602 * 1603 * In this implementation we DO have a CLOSED 1604 * state which is used during initiation and shutdown. 1605 * 1606 * State takes values from SCTP_STATE_*. 1607 */ 1608 sctp_state_t state; 1609 1610 /* The cookie life I award for any cookie. */ 1611 struct timeval cookie_life; 1612 1613 /* Overall : The overall association error count. 1614 * Error Count : [Clear this any time I get something.] 1615 */ 1616 int overall_error_count; 1617 1618 /* These are the association's initial, max, and min RTO values. 1619 * These values will be initialized by system defaults, but can 1620 * be modified via the SCTP_RTOINFO socket option. 1621 */ 1622 unsigned long rto_initial; 1623 unsigned long rto_max; 1624 unsigned long rto_min; 1625 1626 /* Maximum number of new data packets that can be sent in a burst. */ 1627 int max_burst; 1628 1629 /* This is the max_retrans value for the association. This value will 1630 * be initialized initialized from system defaults, but can be 1631 * modified by the SCTP_ASSOCINFO socket option. 1632 */ 1633 int max_retrans; 1634 1635 /* Maximum number of times the endpoint will retransmit INIT */ 1636 __u16 max_init_attempts; 1637 1638 /* How many times have we resent an INIT? */ 1639 __u16 init_retries; 1640 1641 /* The largest timeout or RTO value to use in attempting an INIT */ 1642 unsigned long max_init_timeo; 1643 1644 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1645 * the destination address every heartbeat interval. This value 1646 * will be inherited by all new transports. 1647 */ 1648 unsigned long hbinterval; 1649 1650 /* This is the max_retrans value for new transports in the 1651 * association. 1652 */ 1653 __u16 pathmaxrxt; 1654 1655 /* Flag that path mtu update is pending */ 1656 __u8 pmtu_pending; 1657 1658 /* Association : The smallest PMTU discovered for all of the 1659 * PMTU : peer's transport addresses. 1660 */ 1661 __u32 pathmtu; 1662 1663 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1664 __u32 param_flags; 1665 1666 /* SACK delay timeout */ 1667 unsigned long sackdelay; 1668 __u32 sackfreq; 1669 1670 1671 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1672 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1673 1674 /* Transport to which SHUTDOWN chunk was last sent. */ 1675 struct sctp_transport *shutdown_last_sent_to; 1676 1677 /* How many times have we resent a SHUTDOWN */ 1678 int shutdown_retries; 1679 1680 /* Transport to which INIT chunk was last sent. */ 1681 struct sctp_transport *init_last_sent_to; 1682 1683 /* Next TSN : The next TSN number to be assigned to a new 1684 * : DATA chunk. This is sent in the INIT or INIT 1685 * : ACK chunk to the peer and incremented each 1686 * : time a DATA chunk is assigned a TSN 1687 * : (normally just prior to transmit or during 1688 * : fragmentation). 1689 */ 1690 __u32 next_tsn; 1691 1692 /* 1693 * Last Rcvd : This is the last TSN received in sequence. This value 1694 * TSN : is set initially by taking the peer's Initial TSN, 1695 * : received in the INIT or INIT ACK chunk, and 1696 * : subtracting one from it. 1697 * 1698 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1699 */ 1700 1701 __u32 ctsn_ack_point; 1702 1703 /* PR-SCTP Advanced.Peer.Ack.Point */ 1704 __u32 adv_peer_ack_point; 1705 1706 /* Highest TSN that is acknowledged by incoming SACKs. */ 1707 __u32 highest_sacked; 1708 1709 /* The number of unacknowledged data chunks. Reported through 1710 * the SCTP_STATUS sockopt. 1711 */ 1712 __u16 unack_data; 1713 1714 /* The total number of data chunks that we've had to retransmit 1715 * as the result of a T3 timer expiration 1716 */ 1717 __u32 rtx_data_chunks; 1718 1719 /* This is the association's receive buffer space. This value is used 1720 * to set a_rwnd field in an INIT or a SACK chunk. 1721 */ 1722 __u32 rwnd; 1723 1724 /* This is the last advertised value of rwnd over a SACK chunk. */ 1725 __u32 a_rwnd; 1726 1727 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1728 * to slop over a maximum of the association's frag_point. 1729 */ 1730 __u32 rwnd_over; 1731 1732 /* This is the sndbuf size in use for the association. 1733 * This corresponds to the sndbuf size for the association, 1734 * as specified in the sk->sndbuf. 1735 */ 1736 int sndbuf_used; 1737 1738 /* This is the amount of memory that this association has allocated 1739 * in the receive path at any given time. 1740 */ 1741 atomic_t rmem_alloc; 1742 1743 /* This is the wait queue head for send requests waiting on 1744 * the association sndbuf space. 1745 */ 1746 wait_queue_head_t wait; 1747 1748 /* The message size at which SCTP fragmentation will occur. */ 1749 __u32 frag_point; 1750 1751 /* Counter used to count INIT errors. */ 1752 int init_err_counter; 1753 1754 /* Count the number of INIT cycles (for doubling timeout). */ 1755 int init_cycle; 1756 1757 /* Default send parameters. */ 1758 __u16 default_stream; 1759 __u16 default_flags; 1760 __u32 default_ppid; 1761 __u32 default_context; 1762 __u32 default_timetolive; 1763 1764 /* Default receive parameters */ 1765 __u32 default_rcv_context; 1766 1767 /* This tracks outbound ssn for a given stream. */ 1768 struct sctp_ssnmap *ssnmap; 1769 1770 /* All outbound chunks go through this structure. */ 1771 struct sctp_outq outqueue; 1772 1773 /* A smart pipe that will handle reordering and fragmentation, 1774 * as well as handle passing events up to the ULP. 1775 */ 1776 struct sctp_ulpq ulpq; 1777 1778 /* Last TSN that caused an ECNE Chunk to be sent. */ 1779 __u32 last_ecne_tsn; 1780 1781 /* Last TSN that caused a CWR Chunk to be sent. */ 1782 __u32 last_cwr_tsn; 1783 1784 /* How many duplicated TSNs have we seen? */ 1785 int numduptsns; 1786 1787 /* Number of seconds of idle time before an association is closed. 1788 * In the association context, this is really used as a boolean 1789 * since the real timeout is stored in the timeouts array 1790 */ 1791 __u32 autoclose; 1792 1793 /* These are to support 1794 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1795 * and Enforcement of Flow and Message Limits" 1796 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1797 * or "ADDIP" for short. 1798 */ 1799 1800 1801 1802 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1803 * 1804 * R1) One and only one ASCONF Chunk MAY be in transit and 1805 * unacknowledged at any one time. If a sender, after sending 1806 * an ASCONF chunk, decides it needs to transfer another 1807 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1808 * returns from the previous ASCONF Chunk before sending a 1809 * subsequent ASCONF. Note this restriction binds each side, 1810 * so at any time two ASCONF may be in-transit on any given 1811 * association (one sent from each endpoint). 1812 * 1813 * [This is our one-and-only-one ASCONF in flight. If we do 1814 * not have an ASCONF in flight, this is NULL.] 1815 */ 1816 struct sctp_chunk *addip_last_asconf; 1817 1818 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1819 * 1820 * This is needed to implement itmes E1 - E4 of the updated 1821 * spec. Here is the justification: 1822 * 1823 * Since the peer may bundle multiple ASCONF chunks toward us, 1824 * we now need the ability to cache multiple ACKs. The section 1825 * describes in detail how they are cached and cleaned up. 1826 */ 1827 struct list_head asconf_ack_list; 1828 1829 /* These ASCONF chunks are waiting to be sent. 1830 * 1831 * These chunaks can't be pushed to outqueue until receiving 1832 * ASCONF_ACK for the previous ASCONF indicated by 1833 * addip_last_asconf, so as to guarantee that only one ASCONF 1834 * is in flight at any time. 1835 * 1836 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1837 * 1838 * In defining the ASCONF Chunk transfer procedures, it is 1839 * essential that these transfers MUST NOT cause congestion 1840 * within the network. To achieve this, we place these 1841 * restrictions on the transfer of ASCONF Chunks: 1842 * 1843 * R1) One and only one ASCONF Chunk MAY be in transit and 1844 * unacknowledged at any one time. If a sender, after sending 1845 * an ASCONF chunk, decides it needs to transfer another 1846 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1847 * returns from the previous ASCONF Chunk before sending a 1848 * subsequent ASCONF. Note this restriction binds each side, 1849 * so at any time two ASCONF may be in-transit on any given 1850 * association (one sent from each endpoint). 1851 * 1852 * 1853 * [I really think this is EXACTLY the sort of intelligence 1854 * which already resides in sctp_outq. Please move this 1855 * queue and its supporting logic down there. --piggy] 1856 */ 1857 struct list_head addip_chunk_list; 1858 1859 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1860 * 1861 * A2) A serial number should be assigned to the Chunk. The 1862 * serial number SHOULD be a monotonically increasing 1863 * number. The serial number SHOULD be initialized at 1864 * the start of the association to the same value as the 1865 * Initial TSN and every time a new ASCONF chunk is created 1866 * it is incremented by one after assigning the serial number 1867 * to the newly created chunk. 1868 * 1869 * ADDIP 1870 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1871 * 1872 * Serial Number : 32 bits (unsigned integer) 1873 * 1874 * This value represents a Serial Number for the ASCONF 1875 * Chunk. The valid range of Serial Number is from 0 to 1876 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1877 * after reaching 4294967295. 1878 */ 1879 __u32 addip_serial; 1880 1881 /* SCTP AUTH: list of the endpoint shared keys. These 1882 * keys are provided out of band by the user applicaton 1883 * and can't change during the lifetime of the association 1884 */ 1885 struct list_head endpoint_shared_keys; 1886 1887 /* SCTP AUTH: 1888 * The current generated assocaition shared key (secret) 1889 */ 1890 struct sctp_auth_bytes *asoc_shared_key; 1891 1892 /* SCTP AUTH: hmac id of the first peer requested algorithm 1893 * that we support. 1894 */ 1895 __u16 default_hmac_id; 1896 1897 __u16 active_key_id; 1898 1899 /* Need to send an ECNE Chunk? */ 1900 char need_ecne; 1901 1902 /* Is it a temporary association? */ 1903 char temp; 1904 }; 1905 1906 1907 /* An eyecatcher for determining if we are really looking at an 1908 * association data structure. 1909 */ 1910 enum { 1911 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1912 }; 1913 1914 /* Recover the outter association structure. */ 1915 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1916 { 1917 struct sctp_association *asoc; 1918 1919 asoc = container_of(base, struct sctp_association, base); 1920 return asoc; 1921 } 1922 1923 /* These are function signatures for manipulating associations. */ 1924 1925 1926 struct sctp_association * 1927 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1928 sctp_scope_t scope, gfp_t gfp); 1929 void sctp_association_free(struct sctp_association *); 1930 void sctp_association_put(struct sctp_association *); 1931 void sctp_association_hold(struct sctp_association *); 1932 1933 struct sctp_transport *sctp_assoc_choose_init_transport( 1934 struct sctp_association *); 1935 struct sctp_transport *sctp_assoc_choose_shutdown_transport( 1936 struct sctp_association *); 1937 void sctp_assoc_update_retran_path(struct sctp_association *); 1938 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1939 const union sctp_addr *); 1940 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1941 const union sctp_addr *laddr); 1942 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1943 const union sctp_addr *address, 1944 const gfp_t gfp, 1945 const int peer_state); 1946 void sctp_assoc_del_peer(struct sctp_association *asoc, 1947 const union sctp_addr *addr); 1948 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1949 struct sctp_transport *peer); 1950 void sctp_assoc_control_transport(struct sctp_association *, 1951 struct sctp_transport *, 1952 sctp_transport_cmd_t, sctp_sn_error_t); 1953 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1954 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1955 const union sctp_addr *, 1956 const union sctp_addr *); 1957 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1958 void sctp_assoc_update(struct sctp_association *old, 1959 struct sctp_association *new); 1960 1961 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1962 1963 void sctp_assoc_sync_pmtu(struct sctp_association *); 1964 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1965 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1966 void sctp_assoc_set_primary(struct sctp_association *, 1967 struct sctp_transport *); 1968 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1969 struct sctp_transport *); 1970 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1971 gfp_t); 1972 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1973 struct sctp_cookie*, 1974 gfp_t gfp); 1975 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1976 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1977 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1978 const struct sctp_association *asoc, 1979 __be32 serial); 1980 1981 1982 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1983 const union sctp_addr *ss2); 1984 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1985 1986 /* A convenience structure to parse out SCTP specific CMSGs. */ 1987 typedef struct sctp_cmsgs { 1988 struct sctp_initmsg *init; 1989 struct sctp_sndrcvinfo *info; 1990 } sctp_cmsgs_t; 1991 1992 /* Structure for tracking memory objects */ 1993 typedef struct { 1994 char *label; 1995 atomic_t *counter; 1996 } sctp_dbg_objcnt_entry_t; 1997 1998 #endif /* __sctp_structs_h__ */ 1999