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; 221 222 /* Flag to indicate whether computing and verifying checksum 223 * is disabled. */ 224 int checksum_disable; 225 } sctp_globals; 226 227 #define sctp_rto_initial (sctp_globals.rto_initial) 228 #define sctp_rto_min (sctp_globals.rto_min) 229 #define sctp_rto_max (sctp_globals.rto_max) 230 #define sctp_rto_alpha (sctp_globals.rto_alpha) 231 #define sctp_rto_beta (sctp_globals.rto_beta) 232 #define sctp_max_burst (sctp_globals.max_burst) 233 #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) 234 #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) 235 #define sctp_max_retrans_association (sctp_globals.max_retrans_association) 236 #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) 237 #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) 238 #define sctp_max_retrans_path (sctp_globals.max_retrans_path) 239 #define sctp_max_retrans_init (sctp_globals.max_retrans_init) 240 #define sctp_sack_timeout (sctp_globals.sack_timeout) 241 #define sctp_hb_interval (sctp_globals.hb_interval) 242 #define sctp_max_instreams (sctp_globals.max_instreams) 243 #define sctp_max_outstreams (sctp_globals.max_outstreams) 244 #define sctp_address_families (sctp_globals.address_families) 245 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 246 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 247 #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) 248 #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) 249 #define sctp_port_hashsize (sctp_globals.port_hashsize) 250 #define sctp_port_rover (sctp_globals.port_rover) 251 #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) 252 #define sctp_port_hashtable (sctp_globals.port_hashtable) 253 #define sctp_local_addr_list (sctp_globals.local_addr_list) 254 #define sctp_local_addr_lock (sctp_globals.addr_list_lock) 255 #define sctp_addip_enable (sctp_globals.addip_enable) 256 #define sctp_addip_noauth (sctp_globals.addip_noauth_enable) 257 #define sctp_prsctp_enable (sctp_globals.prsctp_enable) 258 #define sctp_auth_enable (sctp_globals.auth_enable) 259 #define sctp_checksum_disable (sctp_globals.checksum_disable) 260 261 /* SCTP Socket type: UDP or TCP style. */ 262 typedef enum { 263 SCTP_SOCKET_UDP = 0, 264 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 265 SCTP_SOCKET_TCP 266 } sctp_socket_type_t; 267 268 /* Per socket SCTP information. */ 269 struct sctp_sock { 270 /* inet_sock has to be the first member of sctp_sock */ 271 struct inet_sock inet; 272 /* What kind of a socket is this? */ 273 sctp_socket_type_t type; 274 275 /* PF_ family specific functions. */ 276 struct sctp_pf *pf; 277 278 /* Access to HMAC transform. */ 279 struct crypto_hash *hmac; 280 281 /* What is our base endpointer? */ 282 struct sctp_endpoint *ep; 283 284 struct sctp_bind_bucket *bind_hash; 285 /* Various Socket Options. */ 286 __u16 default_stream; 287 __u32 default_ppid; 288 __u16 default_flags; 289 __u32 default_context; 290 __u32 default_timetolive; 291 __u32 default_rcv_context; 292 int max_burst; 293 294 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 295 * the destination address every heartbeat interval. This value 296 * will be inherited by all new associations. 297 */ 298 __u32 hbinterval; 299 300 /* This is the max_retrans value for new associations. */ 301 __u16 pathmaxrxt; 302 303 /* The initial Path MTU to use for new associations. */ 304 __u32 pathmtu; 305 306 /* The default SACK delay timeout for new associations. */ 307 __u32 sackdelay; 308 __u32 sackfreq; 309 310 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 311 __u32 param_flags; 312 313 struct sctp_initmsg initmsg; 314 struct sctp_rtoinfo rtoinfo; 315 struct sctp_paddrparams paddrparam; 316 struct sctp_event_subscribe subscribe; 317 struct sctp_assocparams assocparams; 318 int user_frag; 319 __u32 autoclose; 320 __u8 nodelay; 321 __u8 disable_fragments; 322 __u8 v4mapped; 323 __u8 frag_interleave; 324 __u32 adaptation_ind; 325 __u32 pd_point; 326 327 atomic_t pd_mode; 328 /* Receive to here while partial delivery is in effect. */ 329 struct sk_buff_head pd_lobby; 330 }; 331 332 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 333 { 334 return (struct sctp_sock *)sk; 335 } 336 337 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 338 { 339 return (struct sock *)sp; 340 } 341 342 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 343 struct sctp6_sock { 344 struct sctp_sock sctp; 345 struct ipv6_pinfo inet6; 346 }; 347 #endif /* CONFIG_IPV6 */ 348 349 350 /* This is our APPLICATION-SPECIFIC state cookie. 351 * THIS IS NOT DICTATED BY THE SPECIFICATION. 352 */ 353 /* These are the parts of an association which we send in the cookie. 354 * Most of these are straight out of: 355 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 356 * 357 */ 358 359 struct sctp_cookie { 360 361 /* My : Tag expected in every inbound packet and sent 362 * Verification: in the INIT or INIT ACK chunk. 363 * Tag : 364 */ 365 __u32 my_vtag; 366 367 /* Peer's : Tag expected in every outbound packet except 368 * Verification: in the INIT chunk. 369 * Tag : 370 */ 371 __u32 peer_vtag; 372 373 /* The rest of these are not from the spec, but really need to 374 * be in the cookie. 375 */ 376 377 /* My Tie Tag : Assist in discovering a restarting association. */ 378 __u32 my_ttag; 379 380 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 381 __u32 peer_ttag; 382 383 /* When does this cookie expire? */ 384 struct timeval expiration; 385 386 /* Number of inbound/outbound streams which are set 387 * and negotiated during the INIT process. 388 */ 389 __u16 sinit_num_ostreams; 390 __u16 sinit_max_instreams; 391 392 /* This is the first sequence number I used. */ 393 __u32 initial_tsn; 394 395 /* This holds the originating address of the INIT packet. */ 396 union sctp_addr peer_addr; 397 398 /* IG Section 2.35.3 399 * Include the source port of the INIT-ACK 400 */ 401 __u16 my_port; 402 403 __u8 prsctp_capable; 404 405 /* Padding for future use */ 406 __u8 padding; 407 408 __u32 adaptation_ind; 409 410 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 411 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 412 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 413 414 /* This is a shim for my peer's INIT packet, followed by 415 * a copy of the raw address list of the association. 416 * The length of the raw address list is saved in the 417 * raw_addr_list_len field, which will be used at the time when 418 * the association TCB is re-constructed from the cookie. 419 */ 420 __u32 raw_addr_list_len; 421 struct sctp_init_chunk peer_init[0]; 422 }; 423 424 425 /* The format of our cookie that we send to our peer. */ 426 struct sctp_signed_cookie { 427 __u8 signature[SCTP_SECRET_SIZE]; 428 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 429 struct sctp_cookie c; 430 } __attribute__((packed)); 431 432 /* This is another convenience type to allocate memory for address 433 * params for the maximum size and pass such structures around 434 * internally. 435 */ 436 union sctp_addr_param { 437 struct sctp_paramhdr p; 438 struct sctp_ipv4addr_param v4; 439 struct sctp_ipv6addr_param v6; 440 }; 441 442 /* A convenience type to allow walking through the various 443 * parameters and avoid casting all over the place. 444 */ 445 union sctp_params { 446 void *v; 447 struct sctp_paramhdr *p; 448 struct sctp_cookie_preserve_param *life; 449 struct sctp_hostname_param *dns; 450 struct sctp_cookie_param *cookie; 451 struct sctp_supported_addrs_param *sat; 452 struct sctp_ipv4addr_param *v4; 453 struct sctp_ipv6addr_param *v6; 454 union sctp_addr_param *addr; 455 struct sctp_adaptation_ind_param *aind; 456 struct sctp_supported_ext_param *ext; 457 struct sctp_random_param *random; 458 struct sctp_chunks_param *chunks; 459 struct sctp_hmac_algo_param *hmac_algo; 460 struct sctp_addip_param *addip; 461 }; 462 463 /* RFC 2960. Section 3.3.5 Heartbeat. 464 * Heartbeat Information: variable length 465 * The Sender-specific Heartbeat Info field should normally include 466 * information about the sender's current time when this HEARTBEAT 467 * chunk is sent and the destination transport address to which this 468 * HEARTBEAT is sent (see Section 8.3). 469 */ 470 typedef struct sctp_sender_hb_info { 471 struct sctp_paramhdr param_hdr; 472 union sctp_addr daddr; 473 unsigned long sent_at; 474 __u64 hb_nonce; 475 } __attribute__((packed)) sctp_sender_hb_info_t; 476 477 /* 478 * RFC 2960 1.3.2 Sequenced Delivery within Streams 479 * 480 * The term "stream" is used in SCTP to refer to a sequence of user 481 * messages that are to be delivered to the upper-layer protocol in 482 * order with respect to other messages within the same stream. This is 483 * in contrast to its usage in TCP, where it refers to a sequence of 484 * bytes (in this document a byte is assumed to be eight bits). 485 * ... 486 * 487 * This is the structure we use to track both our outbound and inbound 488 * SSN, or Stream Sequence Numbers. 489 */ 490 491 struct sctp_stream { 492 __u16 *ssn; 493 unsigned int len; 494 }; 495 496 struct sctp_ssnmap { 497 struct sctp_stream in; 498 struct sctp_stream out; 499 int malloced; 500 }; 501 502 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 503 gfp_t gfp); 504 void sctp_ssnmap_free(struct sctp_ssnmap *map); 505 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 506 507 /* What is the current SSN number for this stream? */ 508 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 509 { 510 return stream->ssn[id]; 511 } 512 513 /* Return the next SSN number for this stream. */ 514 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 515 { 516 return stream->ssn[id]++; 517 } 518 519 /* Skip over this ssn and all below. */ 520 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 521 __u16 ssn) 522 { 523 stream->ssn[id] = ssn+1; 524 } 525 526 /* 527 * Pointers to address related SCTP functions. 528 * (i.e. things that depend on the address family.) 529 */ 530 struct sctp_af { 531 int (*sctp_xmit) (struct sk_buff *skb, 532 struct sctp_transport *); 533 int (*setsockopt) (struct sock *sk, 534 int level, 535 int optname, 536 char __user *optval, 537 int optlen); 538 int (*getsockopt) (struct sock *sk, 539 int level, 540 int optname, 541 char __user *optval, 542 int __user *optlen); 543 int (*compat_setsockopt) (struct sock *sk, 544 int level, 545 int optname, 546 char __user *optval, 547 int optlen); 548 int (*compat_getsockopt) (struct sock *sk, 549 int level, 550 int optname, 551 char __user *optval, 552 int __user *optlen); 553 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 554 union sctp_addr *daddr, 555 union sctp_addr *saddr); 556 void (*get_saddr) (struct sctp_sock *sk, 557 struct sctp_association *asoc, 558 struct dst_entry *dst, 559 union sctp_addr *daddr, 560 union sctp_addr *saddr); 561 void (*copy_addrlist) (struct list_head *, 562 struct net_device *); 563 void (*dst_saddr) (union sctp_addr *saddr, 564 struct dst_entry *dst, 565 __be16 port); 566 int (*cmp_addr) (const union sctp_addr *addr1, 567 const union sctp_addr *addr2); 568 void (*addr_copy) (union sctp_addr *dst, 569 union sctp_addr *src); 570 void (*from_skb) (union sctp_addr *, 571 struct sk_buff *skb, 572 int saddr); 573 void (*from_sk) (union sctp_addr *, 574 struct sock *sk); 575 void (*to_sk_saddr) (union sctp_addr *, 576 struct sock *sk); 577 void (*to_sk_daddr) (union sctp_addr *, 578 struct sock *sk); 579 void (*from_addr_param) (union sctp_addr *, 580 union sctp_addr_param *, 581 __be16 port, int iif); 582 int (*to_addr_param) (const union sctp_addr *, 583 union sctp_addr_param *); 584 int (*addr_valid) (union sctp_addr *, 585 struct sctp_sock *, 586 const struct sk_buff *); 587 sctp_scope_t (*scope) (union sctp_addr *); 588 void (*inaddr_any) (union sctp_addr *, __be16); 589 int (*is_any) (const union sctp_addr *); 590 int (*available) (union sctp_addr *, 591 struct sctp_sock *); 592 int (*skb_iif) (const struct sk_buff *sk); 593 int (*is_ce) (const struct sk_buff *sk); 594 void (*seq_dump_addr)(struct seq_file *seq, 595 union sctp_addr *addr); 596 void (*ecn_capable)(struct sock *sk); 597 __u16 net_header_len; 598 int sockaddr_len; 599 sa_family_t sa_family; 600 struct list_head list; 601 }; 602 603 struct sctp_af *sctp_get_af_specific(sa_family_t); 604 int sctp_register_af(struct sctp_af *); 605 606 /* Protocol family functions. */ 607 struct sctp_pf { 608 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 609 void (*skb_msgname) (struct sk_buff *, char *, int *); 610 int (*af_supported) (sa_family_t, struct sctp_sock *); 611 int (*cmp_addr) (const union sctp_addr *, 612 const union sctp_addr *, 613 struct sctp_sock *); 614 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 615 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 616 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 617 struct sock *(*create_accept_sk) (struct sock *sk, 618 struct sctp_association *asoc); 619 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 620 struct sctp_af *af; 621 }; 622 623 624 /* Structure to track chunk fragments that have been acked, but peer 625 * fragments of the same message have not. 626 */ 627 struct sctp_datamsg { 628 /* Chunks waiting to be submitted to lower layer. */ 629 struct list_head chunks; 630 /* Chunks that have been transmitted. */ 631 struct list_head track; 632 /* Reference counting. */ 633 atomic_t refcnt; 634 /* When is this message no longer interesting to the peer? */ 635 unsigned long expires_at; 636 /* Did the messenge fail to send? */ 637 int send_error; 638 char send_failed; 639 /* Control whether chunks from this message can be abandoned. */ 640 char can_abandon; 641 }; 642 643 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 644 struct sctp_sndrcvinfo *, 645 struct msghdr *, int len); 646 void sctp_datamsg_put(struct sctp_datamsg *); 647 void sctp_chunk_fail(struct sctp_chunk *, int error); 648 int sctp_chunk_abandoned(struct sctp_chunk *); 649 650 /* RFC2960 1.4 Key Terms 651 * 652 * o Chunk: A unit of information within an SCTP packet, consisting of 653 * a chunk header and chunk-specific content. 654 * 655 * As a matter of convenience, we remember the SCTP common header for 656 * each chunk as well as a few other header pointers... 657 */ 658 struct sctp_chunk { 659 struct list_head list; 660 661 atomic_t refcnt; 662 663 /* This is our link to the per-transport transmitted list. */ 664 struct list_head transmitted_list; 665 666 /* This field is used by chunks that hold fragmented data. 667 * For the first fragment this is the list that holds the rest of 668 * fragments. For the remaining fragments, this is the link to the 669 * frag_list maintained in the first fragment. 670 */ 671 struct list_head frag_list; 672 673 /* This points to the sk_buff containing the actual data. */ 674 struct sk_buff *skb; 675 676 /* These are the SCTP headers by reverse order in a packet. 677 * Note that some of these may happen more than once. In that 678 * case, we point at the "current" one, whatever that means 679 * for that level of header. 680 */ 681 682 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 683 union sctp_params param_hdr; 684 union { 685 __u8 *v; 686 struct sctp_datahdr *data_hdr; 687 struct sctp_inithdr *init_hdr; 688 struct sctp_sackhdr *sack_hdr; 689 struct sctp_heartbeathdr *hb_hdr; 690 struct sctp_sender_hb_info *hbs_hdr; 691 struct sctp_shutdownhdr *shutdown_hdr; 692 struct sctp_signed_cookie *cookie_hdr; 693 struct sctp_ecnehdr *ecne_hdr; 694 struct sctp_cwrhdr *ecn_cwr_hdr; 695 struct sctp_errhdr *err_hdr; 696 struct sctp_addiphdr *addip_hdr; 697 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 698 struct sctp_authhdr *auth_hdr; 699 } subh; 700 701 __u8 *chunk_end; 702 703 struct sctp_chunkhdr *chunk_hdr; 704 struct sctphdr *sctp_hdr; 705 706 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 707 struct sctp_sndrcvinfo sinfo; 708 709 /* Which association does this belong to? */ 710 struct sctp_association *asoc; 711 712 /* What endpoint received this chunk? */ 713 struct sctp_ep_common *rcvr; 714 715 /* We fill this in if we are calculating RTT. */ 716 unsigned long sent_at; 717 718 /* What is the origin IP address for this chunk? */ 719 union sctp_addr source; 720 /* Destination address for this chunk. */ 721 union sctp_addr dest; 722 723 /* For outbound message, track all fragments for SEND_FAILED. */ 724 struct sctp_datamsg *msg; 725 726 /* For an inbound chunk, this tells us where it came from. 727 * For an outbound chunk, it tells us where we'd like it to 728 * go. It is NULL if we have no preference. 729 */ 730 struct sctp_transport *transport; 731 732 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 733 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 734 * spec violates the principle premis that all chunks are processed 735 * in order. 736 */ 737 struct sk_buff *auth_chunk; 738 739 #define SCTP_CAN_FRTX 0x0 740 #define SCTP_NEED_FRTX 0x1 741 #define SCTP_DONT_FRTX 0x2 742 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 743 resent:1, /* Has this chunk ever been resent. */ 744 has_tsn:1, /* Does this chunk have a TSN yet? */ 745 has_ssn:1, /* Does this chunk have a SSN yet? */ 746 singleton:1, /* Only chunk in the packet? */ 747 end_of_packet:1, /* Last chunk in the packet? */ 748 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 749 pdiscard:1, /* Discard the whole packet now? */ 750 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 751 data_accepted:1, /* At least 1 chunk accepted */ 752 auth:1, /* IN: was auth'ed | OUT: needs auth */ 753 has_asconf:1, /* IN: have seen an asconf before */ 754 tsn_missing_report:2, /* Data chunk missing counter. */ 755 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 756 }; 757 758 void sctp_chunk_hold(struct sctp_chunk *); 759 void sctp_chunk_put(struct sctp_chunk *); 760 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 761 struct iovec *data); 762 void sctp_chunk_free(struct sctp_chunk *); 763 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 764 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 765 const struct sctp_association *, 766 struct sock *); 767 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 768 union sctp_addr *); 769 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 770 771 enum { 772 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 773 SCTP_ADDR_SRC, /* address can be used as source */ 774 SCTP_ADDR_DEL, /* address about to be deleted */ 775 }; 776 777 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 778 struct sctp_sockaddr_entry { 779 struct list_head list; 780 struct rcu_head rcu; 781 union sctp_addr a; 782 __u8 state; 783 __u8 valid; 784 }; 785 786 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 787 788 /* This structure holds lists of chunks as we are assembling for 789 * transmission. 790 */ 791 struct sctp_packet { 792 /* These are the SCTP header values (host order) for the packet. */ 793 __u16 source_port; 794 __u16 destination_port; 795 __u32 vtag; 796 797 /* This contains the payload chunks. */ 798 struct list_head chunk_list; 799 800 /* This is the overhead of the sctp and ip headers. */ 801 size_t overhead; 802 /* This is the total size of all chunks INCLUDING padding. */ 803 size_t size; 804 805 /* The packet is destined for this transport address. 806 * The function we finally use to pass down to the next lower 807 * layer lives in the transport structure. 808 */ 809 struct sctp_transport *transport; 810 811 /* pointer to the auth chunk for this packet */ 812 struct sctp_chunk *auth; 813 814 /* This packet contains a COOKIE-ECHO chunk. */ 815 __u8 has_cookie_echo; 816 817 /* This packet contains a SACK chunk. */ 818 __u8 has_sack; 819 820 /* This packet contains an AUTH chunk */ 821 __u8 has_auth; 822 823 /* This packet contains at least 1 DATA chunk */ 824 __u8 has_data; 825 826 /* SCTP cannot fragment this packet. So let ip fragment it. */ 827 __u8 ipfragok; 828 829 __u8 malloced; 830 }; 831 832 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 833 struct sctp_transport *, 834 __u16 sport, __u16 dport); 835 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 836 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 837 struct sctp_chunk *, int); 838 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 839 struct sctp_chunk *); 840 int sctp_packet_transmit(struct sctp_packet *); 841 void sctp_packet_free(struct sctp_packet *); 842 843 static inline int sctp_packet_empty(struct sctp_packet *packet) 844 { 845 return (packet->size == packet->overhead); 846 } 847 848 /* This represents a remote transport address. 849 * For local transport addresses, we just use union sctp_addr. 850 * 851 * RFC2960 Section 1.4 Key Terms 852 * 853 * o Transport address: A Transport Address is traditionally defined 854 * by Network Layer address, Transport Layer protocol and Transport 855 * Layer port number. In the case of SCTP running over IP, a 856 * transport address is defined by the combination of an IP address 857 * and an SCTP port number (where SCTP is the Transport protocol). 858 * 859 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 860 * 861 * o The sender keeps a separate congestion control parameter set for 862 * each of the destination addresses it can send to (not each 863 * source-destination pair but for each destination). The parameters 864 * should decay if the address is not used for a long enough time 865 * period. 866 * 867 */ 868 struct sctp_transport { 869 /* A list of transports. */ 870 struct list_head transports; 871 872 /* Reference counting. */ 873 atomic_t refcnt; 874 int dead; 875 876 /* This is the peer's IP address and port. */ 877 union sctp_addr ipaddr; 878 879 /* These are the functions we call to handle LLP stuff. */ 880 struct sctp_af *af_specific; 881 882 /* Which association do we belong to? */ 883 struct sctp_association *asoc; 884 885 /* RFC2960 886 * 887 * 12.3 Per Transport Address Data 888 * 889 * For each destination transport address in the peer's 890 * address list derived from the INIT or INIT ACK chunk, a 891 * number of data elements needs to be maintained including: 892 */ 893 /* RTO : The current retransmission timeout value. */ 894 unsigned long rto; 895 unsigned long last_rto; 896 897 __u32 rtt; /* This is the most recent RTT. */ 898 899 /* RTTVAR : The current RTT variation. */ 900 __u32 rttvar; 901 902 /* SRTT : The current smoothed round trip time. */ 903 __u32 srtt; 904 905 /* RTO-Pending : A flag used to track if one of the DATA 906 * chunks sent to this address is currently being 907 * used to compute a RTT. If this flag is 0, 908 * the next DATA chunk sent to this destination 909 * should be used to compute a RTT and this flag 910 * should be set. Every time the RTT 911 * calculation completes (i.e. the DATA chunk 912 * is SACK'd) clear this flag. 913 * hb_sent : a flag that signals that we have a pending heartbeat. 914 */ 915 __u8 rto_pending; 916 __u8 hb_sent; 917 918 /* Flag to track the current fast recovery state */ 919 __u8 fast_recovery; 920 921 /* 922 * These are the congestion stats. 923 */ 924 /* cwnd : The current congestion window. */ 925 __u32 cwnd; /* This is the actual cwnd. */ 926 927 /* ssthresh : The current slow start threshold value. */ 928 __u32 ssthresh; 929 930 /* partial : The tracking method for increase of cwnd when in 931 * bytes acked : congestion avoidance mode (see Section 6.2.2) 932 */ 933 __u32 partial_bytes_acked; 934 935 /* Data that has been sent, but not acknowledged. */ 936 __u32 flight_size; 937 938 /* TSN marking the fast recovery exit point */ 939 __u32 fast_recovery_exit; 940 941 /* Destination */ 942 struct dst_entry *dst; 943 /* Source address. */ 944 union sctp_addr saddr; 945 946 /* When was the last time(in jiffies) that a data packet was sent on 947 * this transport? This is used to adjust the cwnd when the transport 948 * becomes inactive. 949 */ 950 unsigned long last_time_used; 951 952 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 953 * the destination address every heartbeat interval. 954 */ 955 unsigned long hbinterval; 956 957 /* SACK delay timeout */ 958 unsigned long sackdelay; 959 __u32 sackfreq; 960 961 /* When was the last time (in jiffies) that we heard from this 962 * transport? We use this to pick new active and retran paths. 963 */ 964 unsigned long last_time_heard; 965 966 /* Last time(in jiffies) when cwnd is reduced due to the congestion 967 * indication based on ECNE chunk. 968 */ 969 unsigned long last_time_ecne_reduced; 970 971 /* This is the max_retrans value for the transport and will 972 * be initialized from the assocs value. This can be changed 973 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 974 */ 975 __u16 pathmaxrxt; 976 977 /* is the Path MTU update pending on this tranport */ 978 __u8 pmtu_pending; 979 980 /* PMTU : The current known path MTU. */ 981 __u32 pathmtu; 982 983 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 984 __u32 param_flags; 985 986 /* The number of times INIT has been sent on this transport. */ 987 int init_sent_count; 988 989 /* state : The current state of this destination, 990 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. 991 */ 992 int state; 993 994 /* These are the error stats for this destination. */ 995 996 /* Error count : The current error count for this destination. */ 997 unsigned short error_count; 998 999 /* Per : A timer used by each destination. 1000 * Destination : 1001 * Timer : 1002 * 1003 * [Everywhere else in the text this is called T3-rtx. -ed] 1004 */ 1005 struct timer_list T3_rtx_timer; 1006 1007 /* Heartbeat timer is per destination. */ 1008 struct timer_list hb_timer; 1009 1010 /* Since we're using per-destination retransmission timers 1011 * (see above), we're also using per-destination "transmitted" 1012 * queues. This probably ought to be a private struct 1013 * accessible only within the outqueue, but it's not, yet. 1014 */ 1015 struct list_head transmitted; 1016 1017 /* We build bundle-able packets for this transport here. */ 1018 struct sctp_packet packet; 1019 1020 /* This is the list of transports that have chunks to send. */ 1021 struct list_head send_ready; 1022 1023 int malloced; /* Is this structure kfree()able? */ 1024 1025 /* State information saved for SFR_CACC algorithm. The key 1026 * idea in SFR_CACC is to maintain state at the sender on a 1027 * per-destination basis when a changeover happens. 1028 * char changeover_active; 1029 * char cycling_changeover; 1030 * __u32 next_tsn_at_change; 1031 * char cacc_saw_newack; 1032 */ 1033 struct { 1034 /* An unsigned integer, which stores the next TSN to be 1035 * used by the sender, at the moment of changeover. 1036 */ 1037 __u32 next_tsn_at_change; 1038 1039 /* A flag which indicates the occurrence of a changeover */ 1040 char changeover_active; 1041 1042 /* A flag which indicates whether the change of primary is 1043 * the first switch to this destination address during an 1044 * active switch. 1045 */ 1046 char cycling_changeover; 1047 1048 /* A temporary flag, which is used during the processing of 1049 * a SACK to estimate the causative TSN(s)'s group. 1050 */ 1051 char cacc_saw_newack; 1052 } cacc; 1053 1054 /* 64-bit random number sent with heartbeat. */ 1055 __u64 hb_nonce; 1056 }; 1057 1058 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1059 gfp_t); 1060 void sctp_transport_set_owner(struct sctp_transport *, 1061 struct sctp_association *); 1062 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1063 struct sctp_sock *); 1064 void sctp_transport_pmtu(struct sctp_transport *); 1065 void sctp_transport_free(struct sctp_transport *); 1066 void sctp_transport_reset_timers(struct sctp_transport *, int); 1067 void sctp_transport_hold(struct sctp_transport *); 1068 void sctp_transport_put(struct sctp_transport *); 1069 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1070 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1071 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1072 unsigned long sctp_transport_timeout(struct sctp_transport *); 1073 void sctp_transport_reset(struct sctp_transport *); 1074 void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1075 1076 1077 /* This is the structure we use to queue packets as they come into 1078 * SCTP. We write packets to it and read chunks from it. 1079 */ 1080 struct sctp_inq { 1081 /* This is actually a queue of sctp_chunk each 1082 * containing a partially decoded packet. 1083 */ 1084 struct list_head in_chunk_list; 1085 /* This is the packet which is currently off the in queue and is 1086 * being worked on through the inbound chunk processing. 1087 */ 1088 struct sctp_chunk *in_progress; 1089 1090 /* This is the delayed task to finish delivering inbound 1091 * messages. 1092 */ 1093 struct work_struct immediate; 1094 1095 int malloced; /* Is this structure kfree()able? */ 1096 }; 1097 1098 void sctp_inq_init(struct sctp_inq *); 1099 void sctp_inq_free(struct sctp_inq *); 1100 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1101 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1102 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1103 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1104 1105 /* This is the structure we use to hold outbound chunks. You push 1106 * chunks in and they automatically pop out the other end as bundled 1107 * packets (it calls (*output_handler)()). 1108 * 1109 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1110 * and 8.2 of the v13 draft. 1111 * 1112 * It handles retransmissions. The connection to the timeout portion 1113 * of the state machine is through sctp_..._timeout() and timeout_handler. 1114 * 1115 * If you feed it SACKs, it will eat them. 1116 * 1117 * If you give it big chunks, it will fragment them. 1118 * 1119 * It assigns TSN's to data chunks. This happens at the last possible 1120 * instant before transmission. 1121 * 1122 * When free()'d, it empties itself out via output_handler(). 1123 */ 1124 struct sctp_outq { 1125 struct sctp_association *asoc; 1126 1127 /* Data pending that has never been transmitted. */ 1128 struct list_head out_chunk_list; 1129 1130 unsigned out_qlen; /* Total length of queued data chunks. */ 1131 1132 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1133 unsigned error; 1134 1135 /* These are control chunks we want to send. */ 1136 struct list_head control_chunk_list; 1137 1138 /* These are chunks that have been sacked but are above the 1139 * CTSN, or cumulative tsn ack point. 1140 */ 1141 struct list_head sacked; 1142 1143 /* Put chunks on this list to schedule them for 1144 * retransmission. 1145 */ 1146 struct list_head retransmit; 1147 1148 /* Put chunks on this list to save them for FWD TSN processing as 1149 * they were abandoned. 1150 */ 1151 struct list_head abandoned; 1152 1153 /* How many unackd bytes do we have in-flight? */ 1154 __u32 outstanding_bytes; 1155 1156 /* Are we doing fast-rtx on this queue */ 1157 char fast_rtx; 1158 1159 /* Corked? */ 1160 char cork; 1161 1162 /* Is this structure empty? */ 1163 char empty; 1164 1165 /* Are we kfree()able? */ 1166 char malloced; 1167 }; 1168 1169 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1170 void sctp_outq_teardown(struct sctp_outq *); 1171 void sctp_outq_free(struct sctp_outq*); 1172 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1173 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1174 int sctp_outq_is_empty(const struct sctp_outq *); 1175 void sctp_outq_restart(struct sctp_outq *); 1176 1177 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1178 sctp_retransmit_reason_t); 1179 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1180 int sctp_outq_uncork(struct sctp_outq *); 1181 /* Uncork and flush an outqueue. */ 1182 static inline void sctp_outq_cork(struct sctp_outq *q) 1183 { 1184 q->cork = 1; 1185 } 1186 1187 /* These bind address data fields common between endpoints and associations */ 1188 struct sctp_bind_addr { 1189 1190 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1191 * 1192 * SCTP Port: The local SCTP port number the endpoint is 1193 * bound to. 1194 */ 1195 __u16 port; 1196 1197 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1198 * 1199 * Address List: The list of IP addresses that this instance 1200 * has bound. This information is passed to one's 1201 * peer(s) in INIT and INIT ACK chunks. 1202 */ 1203 struct list_head address_list; 1204 1205 int malloced; /* Are we kfree()able? */ 1206 }; 1207 1208 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1209 void sctp_bind_addr_free(struct sctp_bind_addr *); 1210 int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1211 const struct sctp_bind_addr *src, 1212 sctp_scope_t scope, gfp_t gfp, 1213 int flags); 1214 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1215 const struct sctp_bind_addr *src, 1216 gfp_t gfp); 1217 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1218 __u8 addr_state, gfp_t gfp); 1219 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1220 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1221 struct sctp_sock *); 1222 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1223 struct sctp_sock *, struct sctp_sock *); 1224 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1225 const union sctp_addr *addr); 1226 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1227 const union sctp_addr *addrs, 1228 int addrcnt, 1229 struct sctp_sock *opt); 1230 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1231 int *addrs_len, 1232 gfp_t gfp); 1233 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1234 __u16 port, gfp_t gfp); 1235 1236 sctp_scope_t sctp_scope(const union sctp_addr *); 1237 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1238 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1239 int sctp_addr_is_valid(const union sctp_addr *addr); 1240 1241 1242 /* What type of endpoint? */ 1243 typedef enum { 1244 SCTP_EP_TYPE_SOCKET, 1245 SCTP_EP_TYPE_ASSOCIATION, 1246 } sctp_endpoint_type_t; 1247 1248 /* 1249 * A common base class to bridge the implmentation view of a 1250 * socket (usually listening) endpoint versus an association's 1251 * local endpoint. 1252 * This common structure is useful for several purposes: 1253 * 1) Common interface for lookup routines. 1254 * a) Subfunctions work for either endpoint or association 1255 * b) Single interface to lookup allows hiding the lookup lock rather 1256 * than acquiring it externally. 1257 * 2) Common interface for the inbound chunk handling/state machine. 1258 * 3) Common object handling routines for reference counting, etc. 1259 * 4) Disentangle association lookup from endpoint lookup, where we 1260 * do not have to find our endpoint to find our association. 1261 * 1262 */ 1263 1264 struct sctp_ep_common { 1265 /* Fields to help us manage our entries in the hash tables. */ 1266 struct hlist_node node; 1267 int hashent; 1268 1269 /* Runtime type information. What kind of endpoint is this? */ 1270 sctp_endpoint_type_t type; 1271 1272 /* Some fields to help us manage this object. 1273 * refcnt - Reference count access to this object. 1274 * dead - Do not attempt to use this object. 1275 * malloced - Do we need to kfree this object? 1276 */ 1277 atomic_t refcnt; 1278 char dead; 1279 char malloced; 1280 1281 /* What socket does this endpoint belong to? */ 1282 struct sock *sk; 1283 1284 /* This is where we receive inbound chunks. */ 1285 struct sctp_inq inqueue; 1286 1287 /* This substructure includes the defining parameters of the 1288 * endpoint: 1289 * bind_addr.port is our shared port number. 1290 * bind_addr.address_list is our set of local IP addresses. 1291 */ 1292 struct sctp_bind_addr bind_addr; 1293 }; 1294 1295 1296 /* RFC Section 1.4 Key Terms 1297 * 1298 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1299 * multi-homed host, an SCTP endpoint is represented to its peers as a 1300 * combination of a set of eligible destination transport addresses to 1301 * which SCTP packets can be sent and a set of eligible source 1302 * transport addresses from which SCTP packets can be received. 1303 * All transport addresses used by an SCTP endpoint must use the 1304 * same port number, but can use multiple IP addresses. A transport 1305 * address used by an SCTP endpoint must not be used by another 1306 * SCTP endpoint. In other words, a transport address is unique 1307 * to an SCTP endpoint. 1308 * 1309 * From an implementation perspective, each socket has one of these. 1310 * A TCP-style socket will have exactly one association on one of 1311 * these. An UDP-style socket will have multiple associations hanging 1312 * off one of these. 1313 */ 1314 1315 struct sctp_endpoint { 1316 /* Common substructure for endpoint and association. */ 1317 struct sctp_ep_common base; 1318 1319 /* Associations: A list of current associations and mappings 1320 * to the data consumers for each association. This 1321 * may be in the form of a hash table or other 1322 * implementation dependent structure. The data 1323 * consumers may be process identification 1324 * information such as file descriptors, named pipe 1325 * pointer, or table pointers dependent on how SCTP 1326 * is implemented. 1327 */ 1328 /* This is really a list of struct sctp_association entries. */ 1329 struct list_head asocs; 1330 1331 /* Secret Key: A secret key used by this endpoint to compute 1332 * the MAC. This SHOULD be a cryptographic quality 1333 * random number with a sufficient length. 1334 * Discussion in [RFC1750] can be helpful in 1335 * selection of the key. 1336 */ 1337 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1338 int current_key; 1339 int last_key; 1340 int key_changed_at; 1341 1342 /* digest: This is a digest of the sctp cookie. This field is 1343 * only used on the receive path when we try to validate 1344 * that the cookie has not been tampered with. We put 1345 * this here so we pre-allocate this once and can re-use 1346 * on every receive. 1347 */ 1348 __u8 *digest; 1349 1350 /* sendbuf acct. policy. */ 1351 __u32 sndbuf_policy; 1352 1353 /* rcvbuf acct. policy. */ 1354 __u32 rcvbuf_policy; 1355 1356 /* SCTP AUTH: array of the HMACs that will be allocated 1357 * we need this per association so that we don't serialize 1358 */ 1359 struct crypto_hash **auth_hmacs; 1360 1361 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1362 struct sctp_hmac_algo_param *auth_hmacs_list; 1363 1364 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1365 struct sctp_chunks_param *auth_chunk_list; 1366 1367 /* SCTP-AUTH: endpoint shared keys */ 1368 struct list_head endpoint_shared_keys; 1369 __u16 active_key_id; 1370 }; 1371 1372 /* Recover the outter endpoint structure. */ 1373 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1374 { 1375 struct sctp_endpoint *ep; 1376 1377 ep = container_of(base, struct sctp_endpoint, base); 1378 return ep; 1379 } 1380 1381 /* These are function signatures for manipulating endpoints. */ 1382 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1383 void sctp_endpoint_free(struct sctp_endpoint *); 1384 void sctp_endpoint_put(struct sctp_endpoint *); 1385 void sctp_endpoint_hold(struct sctp_endpoint *); 1386 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1387 struct sctp_association *sctp_endpoint_lookup_assoc( 1388 const struct sctp_endpoint *ep, 1389 const union sctp_addr *paddr, 1390 struct sctp_transport **); 1391 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1392 const union sctp_addr *); 1393 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1394 const union sctp_addr *); 1395 int sctp_has_association(const union sctp_addr *laddr, 1396 const union sctp_addr *paddr); 1397 1398 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1399 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1400 struct sctp_chunk **err_chunk); 1401 int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1402 const union sctp_addr *peer, 1403 sctp_init_chunk_t *init, gfp_t gfp); 1404 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1405 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1406 1407 struct sctp_inithdr_host { 1408 __u32 init_tag; 1409 __u32 a_rwnd; 1410 __u16 num_outbound_streams; 1411 __u16 num_inbound_streams; 1412 __u32 initial_tsn; 1413 }; 1414 1415 /* RFC2960 1416 * 1417 * 12. Recommended Transmission Control Block (TCB) Parameters 1418 * 1419 * This section details a recommended set of parameters that should 1420 * be contained within the TCB for an implementation. This section is 1421 * for illustrative purposes and should not be deemed as requirements 1422 * on an implementation or as an exhaustive list of all parameters 1423 * inside an SCTP TCB. Each implementation may need its own additional 1424 * parameters for optimization. 1425 */ 1426 1427 1428 /* Here we have information about each individual association. */ 1429 struct sctp_association { 1430 1431 /* A base structure common to endpoint and association. 1432 * In this context, it represents the associations's view 1433 * of the local endpoint of the association. 1434 */ 1435 struct sctp_ep_common base; 1436 1437 /* Associations on the same socket. */ 1438 struct list_head asocs; 1439 1440 /* association id. */ 1441 sctp_assoc_t assoc_id; 1442 1443 /* This is our parent endpoint. */ 1444 struct sctp_endpoint *ep; 1445 1446 /* These are those association elements needed in the cookie. */ 1447 struct sctp_cookie c; 1448 1449 /* This is all information about our peer. */ 1450 struct { 1451 /* rwnd 1452 * 1453 * Peer Rwnd : Current calculated value of the peer's rwnd. 1454 */ 1455 __u32 rwnd; 1456 1457 /* transport_addr_list 1458 * 1459 * Peer : A list of SCTP transport addresses that the 1460 * Transport : peer is bound to. This information is derived 1461 * Address : from the INIT or INIT ACK and is used to 1462 * List : associate an inbound packet with a given 1463 * : association. Normally this information is 1464 * : hashed or keyed for quick lookup and access 1465 * : of the TCB. 1466 * : The list is also initialized with the list 1467 * : of addresses passed with the sctp_connectx() 1468 * : call. 1469 * 1470 * It is a list of SCTP_transport's. 1471 */ 1472 struct list_head transport_addr_list; 1473 1474 /* transport_count 1475 * 1476 * Peer : A count of the number of peer addresses 1477 * Transport : in the Peer Transport Address List. 1478 * Address : 1479 * Count : 1480 */ 1481 __u16 transport_count; 1482 1483 /* port 1484 * The transport layer port number. 1485 */ 1486 __u16 port; 1487 1488 /* primary_path 1489 * 1490 * Primary : This is the current primary destination 1491 * Path : transport address of the peer endpoint. It 1492 * : may also specify a source transport address 1493 * : on this endpoint. 1494 * 1495 * All of these paths live on transport_addr_list. 1496 * 1497 * At the bakeoffs, we discovered that the intent of 1498 * primaryPath is that it only changes when the ULP 1499 * asks to have it changed. We add the activePath to 1500 * designate the connection we are currently using to 1501 * transmit new data and most control chunks. 1502 */ 1503 struct sctp_transport *primary_path; 1504 1505 /* Cache the primary path address here, when we 1506 * need a an address for msg_name. 1507 */ 1508 union sctp_addr primary_addr; 1509 1510 /* active_path 1511 * The path that we are currently using to 1512 * transmit new data and most control chunks. 1513 */ 1514 struct sctp_transport *active_path; 1515 1516 /* retran_path 1517 * 1518 * RFC2960 6.4 Multi-homed SCTP Endpoints 1519 * ... 1520 * Furthermore, when its peer is multi-homed, an 1521 * endpoint SHOULD try to retransmit a chunk to an 1522 * active destination transport address that is 1523 * different from the last destination address to 1524 * which the DATA chunk was sent. 1525 */ 1526 struct sctp_transport *retran_path; 1527 1528 /* Pointer to last transport I have sent on. */ 1529 struct sctp_transport *last_sent_to; 1530 1531 /* This is the last transport I have received DATA on. */ 1532 struct sctp_transport *last_data_from; 1533 1534 /* 1535 * Mapping An array of bits or bytes indicating which out of 1536 * Array order TSN's have been received (relative to the 1537 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1538 * order packets have been received, this array 1539 * will be set to all zero. This structure may be 1540 * in the form of a circular buffer or bit array. 1541 * 1542 * Last Rcvd : This is the last TSN received in 1543 * TSN : sequence. This value is set initially by 1544 * : taking the peer's Initial TSN, received in 1545 * : the INIT or INIT ACK chunk, and subtracting 1546 * : one from it. 1547 * 1548 * Throughout most of the specification this is called the 1549 * "Cumulative TSN ACK Point". In this case, we 1550 * ignore the advice in 12.2 in favour of the term 1551 * used in the bulk of the text. This value is hidden 1552 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1553 */ 1554 struct sctp_tsnmap tsn_map; 1555 1556 /* Ack State : This flag indicates if the next received 1557 * : packet is to be responded to with a 1558 * : SACK. This is initializedto 0. When a packet 1559 * : is received it is incremented. If this value 1560 * : reaches 2 or more, a SACK is sent and the 1561 * : value is reset to 0. Note: This is used only 1562 * : when no DATA chunks are received out of 1563 * : order. When DATA chunks are out of order, 1564 * : SACK's are not delayed (see Section 6). 1565 */ 1566 __u8 sack_needed; /* Do we need to sack the peer? */ 1567 __u32 sack_cnt; 1568 1569 /* These are capabilities which our peer advertised. */ 1570 __u8 ecn_capable; /* Can peer do ECN? */ 1571 __u8 ipv4_address; /* Peer understands IPv4 addresses? */ 1572 __u8 ipv6_address; /* Peer understands IPv6 addresses? */ 1573 __u8 hostname_address;/* Peer understands DNS addresses? */ 1574 __u8 asconf_capable; /* Does peer support ADDIP? */ 1575 __u8 prsctp_capable; /* Can peer do PR-SCTP? */ 1576 __u8 auth_capable; /* Is peer doing SCTP-AUTH? */ 1577 1578 __u32 adaptation_ind; /* Adaptation Code point. */ 1579 1580 /* This mask is used to disable sending the ASCONF chunk 1581 * with specified parameter to peer. 1582 */ 1583 __be16 addip_disabled_mask; 1584 1585 struct sctp_inithdr_host i; 1586 int cookie_len; 1587 void *cookie; 1588 1589 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1590 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1591 * Initial TSN Value minus 1 1592 */ 1593 __u32 addip_serial; 1594 1595 /* SCTP-AUTH: We need to know pears random number, hmac list 1596 * and authenticated chunk list. All that is part of the 1597 * cookie and these are just pointers to those locations 1598 */ 1599 sctp_random_param_t *peer_random; 1600 sctp_chunks_param_t *peer_chunks; 1601 sctp_hmac_algo_param_t *peer_hmacs; 1602 } peer; 1603 1604 /* State : A state variable indicating what state the 1605 * : association is in, i.e. COOKIE-WAIT, 1606 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1607 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1608 * 1609 * Note: No "CLOSED" state is illustrated since if a 1610 * association is "CLOSED" its TCB SHOULD be removed. 1611 * 1612 * In this implementation we DO have a CLOSED 1613 * state which is used during initiation and shutdown. 1614 * 1615 * State takes values from SCTP_STATE_*. 1616 */ 1617 sctp_state_t state; 1618 1619 /* The cookie life I award for any cookie. */ 1620 struct timeval cookie_life; 1621 1622 /* Overall : The overall association error count. 1623 * Error Count : [Clear this any time I get something.] 1624 */ 1625 int overall_error_count; 1626 1627 /* These are the association's initial, max, and min RTO values. 1628 * These values will be initialized by system defaults, but can 1629 * be modified via the SCTP_RTOINFO socket option. 1630 */ 1631 unsigned long rto_initial; 1632 unsigned long rto_max; 1633 unsigned long rto_min; 1634 1635 /* Maximum number of new data packets that can be sent in a burst. */ 1636 int max_burst; 1637 1638 /* This is the max_retrans value for the association. This value will 1639 * be initialized initialized from system defaults, but can be 1640 * modified by the SCTP_ASSOCINFO socket option. 1641 */ 1642 int max_retrans; 1643 1644 /* Maximum number of times the endpoint will retransmit INIT */ 1645 __u16 max_init_attempts; 1646 1647 /* How many times have we resent an INIT? */ 1648 __u16 init_retries; 1649 1650 /* The largest timeout or RTO value to use in attempting an INIT */ 1651 unsigned long max_init_timeo; 1652 1653 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1654 * the destination address every heartbeat interval. This value 1655 * will be inherited by all new transports. 1656 */ 1657 unsigned long hbinterval; 1658 1659 /* This is the max_retrans value for new transports in the 1660 * association. 1661 */ 1662 __u16 pathmaxrxt; 1663 1664 /* Flag that path mtu update is pending */ 1665 __u8 pmtu_pending; 1666 1667 /* Association : The smallest PMTU discovered for all of the 1668 * PMTU : peer's transport addresses. 1669 */ 1670 __u32 pathmtu; 1671 1672 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1673 __u32 param_flags; 1674 1675 /* SACK delay timeout */ 1676 unsigned long sackdelay; 1677 __u32 sackfreq; 1678 1679 1680 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1681 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1682 1683 /* Transport to which SHUTDOWN chunk was last sent. */ 1684 struct sctp_transport *shutdown_last_sent_to; 1685 1686 /* How many times have we resent a SHUTDOWN */ 1687 int shutdown_retries; 1688 1689 /* Transport to which INIT chunk was last sent. */ 1690 struct sctp_transport *init_last_sent_to; 1691 1692 /* Next TSN : The next TSN number to be assigned to a new 1693 * : DATA chunk. This is sent in the INIT or INIT 1694 * : ACK chunk to the peer and incremented each 1695 * : time a DATA chunk is assigned a TSN 1696 * : (normally just prior to transmit or during 1697 * : fragmentation). 1698 */ 1699 __u32 next_tsn; 1700 1701 /* 1702 * Last Rcvd : This is the last TSN received in sequence. This value 1703 * TSN : is set initially by taking the peer's Initial TSN, 1704 * : received in the INIT or INIT ACK chunk, and 1705 * : subtracting one from it. 1706 * 1707 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1708 */ 1709 1710 __u32 ctsn_ack_point; 1711 1712 /* PR-SCTP Advanced.Peer.Ack.Point */ 1713 __u32 adv_peer_ack_point; 1714 1715 /* Highest TSN that is acknowledged by incoming SACKs. */ 1716 __u32 highest_sacked; 1717 1718 /* The number of unacknowledged data chunks. Reported through 1719 * the SCTP_STATUS sockopt. 1720 */ 1721 __u16 unack_data; 1722 1723 /* The total number of data chunks that we've had to retransmit 1724 * as the result of a T3 timer expiration 1725 */ 1726 __u32 rtx_data_chunks; 1727 1728 /* This is the association's receive buffer space. This value is used 1729 * to set a_rwnd field in an INIT or a SACK chunk. 1730 */ 1731 __u32 rwnd; 1732 1733 /* This is the last advertised value of rwnd over a SACK chunk. */ 1734 __u32 a_rwnd; 1735 1736 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1737 * to slop over a maximum of the association's frag_point. 1738 */ 1739 __u32 rwnd_over; 1740 1741 /* This is the sndbuf size in use for the association. 1742 * This corresponds to the sndbuf size for the association, 1743 * as specified in the sk->sndbuf. 1744 */ 1745 int sndbuf_used; 1746 1747 /* This is the amount of memory that this association has allocated 1748 * in the receive path at any given time. 1749 */ 1750 atomic_t rmem_alloc; 1751 1752 /* This is the wait queue head for send requests waiting on 1753 * the association sndbuf space. 1754 */ 1755 wait_queue_head_t wait; 1756 1757 /* The message size at which SCTP fragmentation will occur. */ 1758 __u32 frag_point; 1759 1760 /* Counter used to count INIT errors. */ 1761 int init_err_counter; 1762 1763 /* Count the number of INIT cycles (for doubling timeout). */ 1764 int init_cycle; 1765 1766 /* Default send parameters. */ 1767 __u16 default_stream; 1768 __u16 default_flags; 1769 __u32 default_ppid; 1770 __u32 default_context; 1771 __u32 default_timetolive; 1772 1773 /* Default receive parameters */ 1774 __u32 default_rcv_context; 1775 1776 /* This tracks outbound ssn for a given stream. */ 1777 struct sctp_ssnmap *ssnmap; 1778 1779 /* All outbound chunks go through this structure. */ 1780 struct sctp_outq outqueue; 1781 1782 /* A smart pipe that will handle reordering and fragmentation, 1783 * as well as handle passing events up to the ULP. 1784 */ 1785 struct sctp_ulpq ulpq; 1786 1787 /* Last TSN that caused an ECNE Chunk to be sent. */ 1788 __u32 last_ecne_tsn; 1789 1790 /* Last TSN that caused a CWR Chunk to be sent. */ 1791 __u32 last_cwr_tsn; 1792 1793 /* How many duplicated TSNs have we seen? */ 1794 int numduptsns; 1795 1796 /* Number of seconds of idle time before an association is closed. 1797 * In the association context, this is really used as a boolean 1798 * since the real timeout is stored in the timeouts array 1799 */ 1800 __u32 autoclose; 1801 1802 /* These are to support 1803 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1804 * and Enforcement of Flow and Message Limits" 1805 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1806 * or "ADDIP" for short. 1807 */ 1808 1809 1810 1811 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1812 * 1813 * R1) One and only one ASCONF Chunk MAY be in transit and 1814 * unacknowledged at any one time. If a sender, after sending 1815 * an ASCONF chunk, decides it needs to transfer another 1816 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1817 * returns from the previous ASCONF Chunk before sending a 1818 * subsequent ASCONF. Note this restriction binds each side, 1819 * so at any time two ASCONF may be in-transit on any given 1820 * association (one sent from each endpoint). 1821 * 1822 * [This is our one-and-only-one ASCONF in flight. If we do 1823 * not have an ASCONF in flight, this is NULL.] 1824 */ 1825 struct sctp_chunk *addip_last_asconf; 1826 1827 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1828 * 1829 * This is needed to implement itmes E1 - E4 of the updated 1830 * spec. Here is the justification: 1831 * 1832 * Since the peer may bundle multiple ASCONF chunks toward us, 1833 * we now need the ability to cache multiple ACKs. The section 1834 * describes in detail how they are cached and cleaned up. 1835 */ 1836 struct list_head asconf_ack_list; 1837 1838 /* These ASCONF chunks are waiting to be sent. 1839 * 1840 * These chunaks can't be pushed to outqueue until receiving 1841 * ASCONF_ACK for the previous ASCONF indicated by 1842 * addip_last_asconf, so as to guarantee that only one ASCONF 1843 * is in flight at any time. 1844 * 1845 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1846 * 1847 * In defining the ASCONF Chunk transfer procedures, it is 1848 * essential that these transfers MUST NOT cause congestion 1849 * within the network. To achieve this, we place these 1850 * restrictions on the transfer of ASCONF Chunks: 1851 * 1852 * R1) One and only one ASCONF Chunk MAY be in transit and 1853 * unacknowledged at any one time. If a sender, after sending 1854 * an ASCONF chunk, decides it needs to transfer another 1855 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1856 * returns from the previous ASCONF Chunk before sending a 1857 * subsequent ASCONF. Note this restriction binds each side, 1858 * so at any time two ASCONF may be in-transit on any given 1859 * association (one sent from each endpoint). 1860 * 1861 * 1862 * [I really think this is EXACTLY the sort of intelligence 1863 * which already resides in sctp_outq. Please move this 1864 * queue and its supporting logic down there. --piggy] 1865 */ 1866 struct list_head addip_chunk_list; 1867 1868 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1869 * 1870 * A2) A serial number should be assigned to the Chunk. The 1871 * serial number SHOULD be a monotonically increasing 1872 * number. The serial number SHOULD be initialized at 1873 * the start of the association to the same value as the 1874 * Initial TSN and every time a new ASCONF chunk is created 1875 * it is incremented by one after assigning the serial number 1876 * to the newly created chunk. 1877 * 1878 * ADDIP 1879 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1880 * 1881 * Serial Number : 32 bits (unsigned integer) 1882 * 1883 * This value represents a Serial Number for the ASCONF 1884 * Chunk. The valid range of Serial Number is from 0 to 1885 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1886 * after reaching 4294967295. 1887 */ 1888 __u32 addip_serial; 1889 1890 /* SCTP AUTH: list of the endpoint shared keys. These 1891 * keys are provided out of band by the user applicaton 1892 * and can't change during the lifetime of the association 1893 */ 1894 struct list_head endpoint_shared_keys; 1895 1896 /* SCTP AUTH: 1897 * The current generated assocaition shared key (secret) 1898 */ 1899 struct sctp_auth_bytes *asoc_shared_key; 1900 1901 /* SCTP AUTH: hmac id of the first peer requested algorithm 1902 * that we support. 1903 */ 1904 __u16 default_hmac_id; 1905 1906 __u16 active_key_id; 1907 1908 /* Need to send an ECNE Chunk? */ 1909 char need_ecne; 1910 1911 /* Is it a temporary association? */ 1912 char temp; 1913 }; 1914 1915 1916 /* An eyecatcher for determining if we are really looking at an 1917 * association data structure. 1918 */ 1919 enum { 1920 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1921 }; 1922 1923 /* Recover the outter association structure. */ 1924 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1925 { 1926 struct sctp_association *asoc; 1927 1928 asoc = container_of(base, struct sctp_association, base); 1929 return asoc; 1930 } 1931 1932 /* These are function signatures for manipulating associations. */ 1933 1934 1935 struct sctp_association * 1936 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1937 sctp_scope_t scope, gfp_t gfp); 1938 void sctp_association_free(struct sctp_association *); 1939 void sctp_association_put(struct sctp_association *); 1940 void sctp_association_hold(struct sctp_association *); 1941 1942 struct sctp_transport *sctp_assoc_choose_init_transport( 1943 struct sctp_association *); 1944 struct sctp_transport *sctp_assoc_choose_shutdown_transport( 1945 struct sctp_association *); 1946 void sctp_assoc_update_retran_path(struct sctp_association *); 1947 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1948 const union sctp_addr *); 1949 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1950 const union sctp_addr *laddr); 1951 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1952 const union sctp_addr *address, 1953 const gfp_t gfp, 1954 const int peer_state); 1955 void sctp_assoc_del_peer(struct sctp_association *asoc, 1956 const union sctp_addr *addr); 1957 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1958 struct sctp_transport *peer); 1959 void sctp_assoc_control_transport(struct sctp_association *, 1960 struct sctp_transport *, 1961 sctp_transport_cmd_t, sctp_sn_error_t); 1962 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1963 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1964 const union sctp_addr *, 1965 const union sctp_addr *); 1966 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1967 void sctp_assoc_update(struct sctp_association *old, 1968 struct sctp_association *new); 1969 1970 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1971 1972 void sctp_assoc_sync_pmtu(struct sctp_association *); 1973 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1974 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1975 void sctp_assoc_set_primary(struct sctp_association *, 1976 struct sctp_transport *); 1977 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1978 struct sctp_transport *); 1979 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1980 gfp_t); 1981 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1982 struct sctp_cookie*, 1983 gfp_t gfp); 1984 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1985 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1986 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1987 const struct sctp_association *asoc, 1988 __be32 serial); 1989 1990 1991 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1992 const union sctp_addr *ss2); 1993 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1994 1995 /* A convenience structure to parse out SCTP specific CMSGs. */ 1996 typedef struct sctp_cmsgs { 1997 struct sctp_initmsg *init; 1998 struct sctp_sndrcvinfo *info; 1999 } sctp_cmsgs_t; 2000 2001 /* Structure for tracking memory objects */ 2002 typedef struct { 2003 char *label; 2004 atomic_t *counter; 2005 } sctp_dbg_objcnt_entry_t; 2006 2007 #endif /* __sctp_structs_h__ */ 2008