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 */ 72union sctp_addr { 73 struct sockaddr_in v4; 74 struct sockaddr_in6 v6; 75 struct sockaddr sa; 76}; 77 78/* Forward declarations for data structures. */ 79struct sctp_globals; 80struct sctp_endpoint; 81struct sctp_association; 82struct sctp_transport; 83struct sctp_packet; 84struct sctp_chunk; 85struct sctp_inq; 86struct sctp_outq; 87struct sctp_bind_addr; 88struct sctp_ulpq; 89struct sctp_ep_common; 90struct sctp_ssnmap; 91struct 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 100struct sctp_bind_bucket { 101 unsigned short port; 102 unsigned short fastreuse; 103 struct hlist_node node; 104 struct hlist_head owner; 105}; 106 107struct sctp_bind_hashbucket { 108 spinlock_t lock; 109 struct hlist_head chain; 110}; 111 112/* Used for hashing all associations. */ 113struct sctp_hashbucket { 114 rwlock_t lock; 115 struct hlist_head chain; 116} __attribute__((__aligned__(8))); 117 118 119/* The SCTP globals structure. */ 120extern 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 /* 223 * Policy to control SCTP IPv4 address scoping 224 * 0 - Disable IPv4 address scoping 225 * 1 - Enable IPv4 address scoping 226 * 2 - Selectively allow only IPv4 private addresses 227 * 3 - Selectively allow only IPv4 link local address 228 */ 229 int ipv4_scope_policy; 230 231 /* Flag to indicate whether computing and verifying checksum 232 * is disabled. */ 233 int checksum_disable; 234} sctp_globals; 235 236#define sctp_rto_initial (sctp_globals.rto_initial) 237#define sctp_rto_min (sctp_globals.rto_min) 238#define sctp_rto_max (sctp_globals.rto_max) 239#define sctp_rto_alpha (sctp_globals.rto_alpha) 240#define sctp_rto_beta (sctp_globals.rto_beta) 241#define sctp_max_burst (sctp_globals.max_burst) 242#define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) 243#define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) 244#define sctp_max_retrans_association (sctp_globals.max_retrans_association) 245#define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) 246#define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) 247#define sctp_max_retrans_path (sctp_globals.max_retrans_path) 248#define sctp_max_retrans_init (sctp_globals.max_retrans_init) 249#define sctp_sack_timeout (sctp_globals.sack_timeout) 250#define sctp_hb_interval (sctp_globals.hb_interval) 251#define sctp_max_instreams (sctp_globals.max_instreams) 252#define sctp_max_outstreams (sctp_globals.max_outstreams) 253#define sctp_address_families (sctp_globals.address_families) 254#define sctp_ep_hashsize (sctp_globals.ep_hashsize) 255#define sctp_ep_hashtable (sctp_globals.ep_hashtable) 256#define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) 257#define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) 258#define sctp_port_hashsize (sctp_globals.port_hashsize) 259#define sctp_port_rover (sctp_globals.port_rover) 260#define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) 261#define sctp_port_hashtable (sctp_globals.port_hashtable) 262#define sctp_local_addr_list (sctp_globals.local_addr_list) 263#define sctp_local_addr_lock (sctp_globals.addr_list_lock) 264#define sctp_scope_policy (sctp_globals.ipv4_scope_policy) 265#define sctp_addip_enable (sctp_globals.addip_enable) 266#define sctp_addip_noauth (sctp_globals.addip_noauth_enable) 267#define sctp_prsctp_enable (sctp_globals.prsctp_enable) 268#define sctp_auth_enable (sctp_globals.auth_enable) 269#define sctp_checksum_disable (sctp_globals.checksum_disable) 270 271/* SCTP Socket type: UDP or TCP style. */ 272typedef enum { 273 SCTP_SOCKET_UDP = 0, 274 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 275 SCTP_SOCKET_TCP 276} sctp_socket_type_t; 277 278/* Per socket SCTP information. */ 279struct sctp_sock { 280 /* inet_sock has to be the first member of sctp_sock */ 281 struct inet_sock inet; 282 /* What kind of a socket is this? */ 283 sctp_socket_type_t type; 284 285 /* PF_ family specific functions. */ 286 struct sctp_pf *pf; 287 288 /* Access to HMAC transform. */ 289 struct crypto_hash *hmac; 290 291 /* What is our base endpointer? */ 292 struct sctp_endpoint *ep; 293 294 struct sctp_bind_bucket *bind_hash; 295 /* Various Socket Options. */ 296 __u16 default_stream; 297 __u32 default_ppid; 298 __u16 default_flags; 299 __u32 default_context; 300 __u32 default_timetolive; 301 __u32 default_rcv_context; 302 int max_burst; 303 304 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 305 * the destination address every heartbeat interval. This value 306 * will be inherited by all new associations. 307 */ 308 __u32 hbinterval; 309 310 /* This is the max_retrans value for new associations. */ 311 __u16 pathmaxrxt; 312 313 /* The initial Path MTU to use for new associations. */ 314 __u32 pathmtu; 315 316 /* The default SACK delay timeout for new associations. */ 317 __u32 sackdelay; 318 __u32 sackfreq; 319 320 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 321 __u32 param_flags; 322 323 struct sctp_initmsg initmsg; 324 struct sctp_rtoinfo rtoinfo; 325 struct sctp_paddrparams paddrparam; 326 struct sctp_event_subscribe subscribe; 327 struct sctp_assocparams assocparams; 328 int user_frag; 329 __u32 autoclose; 330 __u8 nodelay; 331 __u8 disable_fragments; 332 __u8 v4mapped; 333 __u8 frag_interleave; 334 __u32 adaptation_ind; 335 __u32 pd_point; 336 337 atomic_t pd_mode; 338 /* Receive to here while partial delivery is in effect. */ 339 struct sk_buff_head pd_lobby; 340}; 341 342static inline struct sctp_sock *sctp_sk(const struct sock *sk) 343{ 344 return (struct sctp_sock *)sk; 345} 346 347static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 348{ 349 return (struct sock *)sp; 350} 351 352#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 353struct sctp6_sock { 354 struct sctp_sock sctp; 355 struct ipv6_pinfo inet6; 356}; 357#endif /* CONFIG_IPV6 */ 358 359 360/* This is our APPLICATION-SPECIFIC state cookie. 361 * THIS IS NOT DICTATED BY THE SPECIFICATION. 362 */ 363/* These are the parts of an association which we send in the cookie. 364 * Most of these are straight out of: 365 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 366 * 367 */ 368 369struct sctp_cookie { 370 371 /* My : Tag expected in every inbound packet and sent 372 * Verification: in the INIT or INIT ACK chunk. 373 * Tag : 374 */ 375 __u32 my_vtag; 376 377 /* Peer's : Tag expected in every outbound packet except 378 * Verification: in the INIT chunk. 379 * Tag : 380 */ 381 __u32 peer_vtag; 382 383 /* The rest of these are not from the spec, but really need to 384 * be in the cookie. 385 */ 386 387 /* My Tie Tag : Assist in discovering a restarting association. */ 388 __u32 my_ttag; 389 390 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 391 __u32 peer_ttag; 392 393 /* When does this cookie expire? */ 394 struct timeval expiration; 395 396 /* Number of inbound/outbound streams which are set 397 * and negotiated during the INIT process. 398 */ 399 __u16 sinit_num_ostreams; 400 __u16 sinit_max_instreams; 401 402 /* This is the first sequence number I used. */ 403 __u32 initial_tsn; 404 405 /* This holds the originating address of the INIT packet. */ 406 union sctp_addr peer_addr; 407 408 /* IG Section 2.35.3 409 * Include the source port of the INIT-ACK 410 */ 411 __u16 my_port; 412 413 __u8 prsctp_capable; 414 415 /* Padding for future use */ 416 __u8 padding; 417 418 __u32 adaptation_ind; 419 420 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 421 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 422 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 423 424 /* This is a shim for my peer's INIT packet, followed by 425 * a copy of the raw address list of the association. 426 * The length of the raw address list is saved in the 427 * raw_addr_list_len field, which will be used at the time when 428 * the association TCB is re-constructed from the cookie. 429 */ 430 __u32 raw_addr_list_len; 431 struct sctp_init_chunk peer_init[0]; 432}; 433 434 435/* The format of our cookie that we send to our peer. */ 436struct sctp_signed_cookie { 437 __u8 signature[SCTP_SECRET_SIZE]; 438 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 439 struct sctp_cookie c; 440} __attribute__((packed)); 441 442/* This is another convenience type to allocate memory for address 443 * params for the maximum size and pass such structures around 444 * internally. 445 */ 446union sctp_addr_param { 447 struct sctp_paramhdr p; 448 struct sctp_ipv4addr_param v4; 449 struct sctp_ipv6addr_param v6; 450}; 451 452/* A convenience type to allow walking through the various 453 * parameters and avoid casting all over the place. 454 */ 455union sctp_params { 456 void *v; 457 struct sctp_paramhdr *p; 458 struct sctp_cookie_preserve_param *life; 459 struct sctp_hostname_param *dns; 460 struct sctp_cookie_param *cookie; 461 struct sctp_supported_addrs_param *sat; 462 struct sctp_ipv4addr_param *v4; 463 struct sctp_ipv6addr_param *v6; 464 union sctp_addr_param *addr; 465 struct sctp_adaptation_ind_param *aind; 466 struct sctp_supported_ext_param *ext; 467 struct sctp_random_param *random; 468 struct sctp_chunks_param *chunks; 469 struct sctp_hmac_algo_param *hmac_algo; 470 struct sctp_addip_param *addip; 471}; 472 473/* RFC 2960. Section 3.3.5 Heartbeat. 474 * Heartbeat Information: variable length 475 * The Sender-specific Heartbeat Info field should normally include 476 * information about the sender's current time when this HEARTBEAT 477 * chunk is sent and the destination transport address to which this 478 * HEARTBEAT is sent (see Section 8.3). 479 */ 480typedef struct sctp_sender_hb_info { 481 struct sctp_paramhdr param_hdr; 482 union sctp_addr daddr; 483 unsigned long sent_at; 484 __u64 hb_nonce; 485} __attribute__((packed)) sctp_sender_hb_info_t; 486 487/* 488 * RFC 2960 1.3.2 Sequenced Delivery within Streams 489 * 490 * The term "stream" is used in SCTP to refer to a sequence of user 491 * messages that are to be delivered to the upper-layer protocol in 492 * order with respect to other messages within the same stream. This is 493 * in contrast to its usage in TCP, where it refers to a sequence of 494 * bytes (in this document a byte is assumed to be eight bits). 495 * ... 496 * 497 * This is the structure we use to track both our outbound and inbound 498 * SSN, or Stream Sequence Numbers. 499 */ 500 501struct sctp_stream { 502 __u16 *ssn; 503 unsigned int len; 504}; 505 506struct sctp_ssnmap { 507 struct sctp_stream in; 508 struct sctp_stream out; 509 int malloced; 510}; 511 512struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 513 gfp_t gfp); 514void sctp_ssnmap_free(struct sctp_ssnmap *map); 515void sctp_ssnmap_clear(struct sctp_ssnmap *map); 516 517/* What is the current SSN number for this stream? */ 518static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 519{ 520 return stream->ssn[id]; 521} 522 523/* Return the next SSN number for this stream. */ 524static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 525{ 526 return stream->ssn[id]++; 527} 528 529/* Skip over this ssn and all below. */ 530static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 531 __u16 ssn) 532{ 533 stream->ssn[id] = ssn+1; 534} 535 536/* 537 * Pointers to address related SCTP functions. 538 * (i.e. things that depend on the address family.) 539 */ 540struct sctp_af { 541 int (*sctp_xmit) (struct sk_buff *skb, 542 struct sctp_transport *); 543 int (*setsockopt) (struct sock *sk, 544 int level, 545 int optname, 546 char __user *optval, 547 unsigned int optlen); 548 int (*getsockopt) (struct sock *sk, 549 int level, 550 int optname, 551 char __user *optval, 552 int __user *optlen); 553 int (*compat_setsockopt) (struct sock *sk, 554 int level, 555 int optname, 556 char __user *optval, 557 unsigned int optlen); 558 int (*compat_getsockopt) (struct sock *sk, 559 int level, 560 int optname, 561 char __user *optval, 562 int __user *optlen); 563 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 564 union sctp_addr *daddr, 565 union sctp_addr *saddr); 566 void (*get_saddr) (struct sctp_sock *sk, 567 struct sctp_association *asoc, 568 struct dst_entry *dst, 569 union sctp_addr *daddr, 570 union sctp_addr *saddr); 571 void (*copy_addrlist) (struct list_head *, 572 struct net_device *); 573 void (*dst_saddr) (union sctp_addr *saddr, 574 struct dst_entry *dst, 575 __be16 port); 576 int (*cmp_addr) (const union sctp_addr *addr1, 577 const union sctp_addr *addr2); 578 void (*addr_copy) (union sctp_addr *dst, 579 union sctp_addr *src); 580 void (*from_skb) (union sctp_addr *, 581 struct sk_buff *skb, 582 int saddr); 583 void (*from_sk) (union sctp_addr *, 584 struct sock *sk); 585 void (*to_sk_saddr) (union sctp_addr *, 586 struct sock *sk); 587 void (*to_sk_daddr) (union sctp_addr *, 588 struct sock *sk); 589 void (*from_addr_param) (union sctp_addr *, 590 union sctp_addr_param *, 591 __be16 port, int iif); 592 int (*to_addr_param) (const union sctp_addr *, 593 union sctp_addr_param *); 594 int (*addr_valid) (union sctp_addr *, 595 struct sctp_sock *, 596 const struct sk_buff *); 597 sctp_scope_t (*scope) (union sctp_addr *); 598 void (*inaddr_any) (union sctp_addr *, __be16); 599 int (*is_any) (const union sctp_addr *); 600 int (*available) (union sctp_addr *, 601 struct sctp_sock *); 602 int (*skb_iif) (const struct sk_buff *sk); 603 int (*is_ce) (const struct sk_buff *sk); 604 void (*seq_dump_addr)(struct seq_file *seq, 605 union sctp_addr *addr); 606 void (*ecn_capable)(struct sock *sk); 607 __u16 net_header_len; 608 int sockaddr_len; 609 sa_family_t sa_family; 610 struct list_head list; 611}; 612 613struct sctp_af *sctp_get_af_specific(sa_family_t); 614int sctp_register_af(struct sctp_af *); 615 616/* Protocol family functions. */ 617struct sctp_pf { 618 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 619 void (*skb_msgname) (struct sk_buff *, char *, int *); 620 int (*af_supported) (sa_family_t, struct sctp_sock *); 621 int (*cmp_addr) (const union sctp_addr *, 622 const union sctp_addr *, 623 struct sctp_sock *); 624 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 625 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 626 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 627 struct sock *(*create_accept_sk) (struct sock *sk, 628 struct sctp_association *asoc); 629 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 630 struct sctp_af *af; 631}; 632 633 634/* Structure to track chunk fragments that have been acked, but peer 635 * fragments of the same message have not. 636 */ 637struct sctp_datamsg { 638 /* Chunks waiting to be submitted to lower layer. */ 639 struct list_head chunks; 640 /* Chunks that have been transmitted. */ 641 size_t msg_size; 642 /* Reference counting. */ 643 atomic_t refcnt; 644 /* When is this message no longer interesting to the peer? */ 645 unsigned long expires_at; 646 /* Did the messenge fail to send? */ 647 int send_error; 648 char send_failed; 649 /* Control whether chunks from this message can be abandoned. */ 650 char can_abandon; 651}; 652 653struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 654 struct sctp_sndrcvinfo *, 655 struct msghdr *, int len); 656void sctp_datamsg_free(struct sctp_datamsg *); 657void sctp_datamsg_put(struct sctp_datamsg *); 658void sctp_chunk_fail(struct sctp_chunk *, int error); 659int sctp_chunk_abandoned(struct sctp_chunk *); 660 661/* RFC2960 1.4 Key Terms 662 * 663 * o Chunk: A unit of information within an SCTP packet, consisting of 664 * a chunk header and chunk-specific content. 665 * 666 * As a matter of convenience, we remember the SCTP common header for 667 * each chunk as well as a few other header pointers... 668 */ 669struct sctp_chunk { 670 struct list_head list; 671 672 atomic_t refcnt; 673 674 /* This is our link to the per-transport transmitted list. */ 675 struct list_head transmitted_list; 676 677 /* This field is used by chunks that hold fragmented data. 678 * For the first fragment this is the list that holds the rest of 679 * fragments. For the remaining fragments, this is the link to the 680 * frag_list maintained in the first fragment. 681 */ 682 struct list_head frag_list; 683 684 /* This points to the sk_buff containing the actual data. */ 685 struct sk_buff *skb; 686 687 /* These are the SCTP headers by reverse order in a packet. 688 * Note that some of these may happen more than once. In that 689 * case, we point at the "current" one, whatever that means 690 * for that level of header. 691 */ 692 693 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 694 union sctp_params param_hdr; 695 union { 696 __u8 *v; 697 struct sctp_datahdr *data_hdr; 698 struct sctp_inithdr *init_hdr; 699 struct sctp_sackhdr *sack_hdr; 700 struct sctp_heartbeathdr *hb_hdr; 701 struct sctp_sender_hb_info *hbs_hdr; 702 struct sctp_shutdownhdr *shutdown_hdr; 703 struct sctp_signed_cookie *cookie_hdr; 704 struct sctp_ecnehdr *ecne_hdr; 705 struct sctp_cwrhdr *ecn_cwr_hdr; 706 struct sctp_errhdr *err_hdr; 707 struct sctp_addiphdr *addip_hdr; 708 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 709 struct sctp_authhdr *auth_hdr; 710 } subh; 711 712 __u8 *chunk_end; 713 714 struct sctp_chunkhdr *chunk_hdr; 715 struct sctphdr *sctp_hdr; 716 717 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 718 struct sctp_sndrcvinfo sinfo; 719 720 /* Which association does this belong to? */ 721 struct sctp_association *asoc; 722 723 /* What endpoint received this chunk? */ 724 struct sctp_ep_common *rcvr; 725 726 /* We fill this in if we are calculating RTT. */ 727 unsigned long sent_at; 728 729 /* What is the origin IP address for this chunk? */ 730 union sctp_addr source; 731 /* Destination address for this chunk. */ 732 union sctp_addr dest; 733 734 /* For outbound message, track all fragments for SEND_FAILED. */ 735 struct sctp_datamsg *msg; 736 737 /* For an inbound chunk, this tells us where it came from. 738 * For an outbound chunk, it tells us where we'd like it to 739 * go. It is NULL if we have no preference. 740 */ 741 struct sctp_transport *transport; 742 743 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 744 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 745 * spec violates the principle premis that all chunks are processed 746 * in order. 747 */ 748 struct sk_buff *auth_chunk; 749 750#define SCTP_CAN_FRTX 0x0 751#define SCTP_NEED_FRTX 0x1 752#define SCTP_DONT_FRTX 0x2 753 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 754 resent:1, /* Has this chunk ever been resent. */ 755 has_tsn:1, /* Does this chunk have a TSN yet? */ 756 has_ssn:1, /* Does this chunk have a SSN yet? */ 757 singleton:1, /* Only chunk in the packet? */ 758 end_of_packet:1, /* Last chunk in the packet? */ 759 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 760 pdiscard:1, /* Discard the whole packet now? */ 761 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 762 data_accepted:1, /* At least 1 chunk accepted */ 763 auth:1, /* IN: was auth'ed | OUT: needs auth */ 764 has_asconf:1, /* IN: have seen an asconf before */ 765 tsn_missing_report:2, /* Data chunk missing counter. */ 766 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 767}; 768 769void sctp_chunk_hold(struct sctp_chunk *); 770void sctp_chunk_put(struct sctp_chunk *); 771int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 772 struct iovec *data); 773void sctp_chunk_free(struct sctp_chunk *); 774void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 775struct sctp_chunk *sctp_chunkify(struct sk_buff *, 776 const struct sctp_association *, 777 struct sock *); 778void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 779 union sctp_addr *); 780const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 781 782enum { 783 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 784 SCTP_ADDR_SRC, /* address can be used as source */ 785 SCTP_ADDR_DEL, /* address about to be deleted */ 786}; 787 788/* This is a structure for holding either an IPv6 or an IPv4 address. */ 789struct sctp_sockaddr_entry { 790 struct list_head list; 791 struct rcu_head rcu; 792 union sctp_addr a; 793 __u8 state; 794 __u8 valid; 795}; 796 797typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 798 799/* This structure holds lists of chunks as we are assembling for 800 * transmission. 801 */ 802struct sctp_packet { 803 /* These are the SCTP header values (host order) for the packet. */ 804 __u16 source_port; 805 __u16 destination_port; 806 __u32 vtag; 807 808 /* This contains the payload chunks. */ 809 struct list_head chunk_list; 810 811 /* This is the overhead of the sctp and ip headers. */ 812 size_t overhead; 813 /* This is the total size of all chunks INCLUDING padding. */ 814 size_t size; 815 816 /* The packet is destined for this transport address. 817 * The function we finally use to pass down to the next lower 818 * layer lives in the transport structure. 819 */ 820 struct sctp_transport *transport; 821 822 /* pointer to the auth chunk for this packet */ 823 struct sctp_chunk *auth; 824 825 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 826 has_sack:1, /* This packet contains a SACK chunk. */ 827 has_auth:1, /* This packet contains an AUTH chunk */ 828 has_data:1, /* This packet contains at least 1 DATA chunk */ 829 ipfragok:1, /* So let ip fragment this packet */ 830 malloced:1; /* Is it malloced? */ 831}; 832 833struct sctp_packet *sctp_packet_init(struct sctp_packet *, 834 struct sctp_transport *, 835 __u16 sport, __u16 dport); 836struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 837sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 838 struct sctp_chunk *, int); 839sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 840 struct sctp_chunk *); 841int sctp_packet_transmit(struct sctp_packet *); 842void sctp_packet_free(struct sctp_packet *); 843 844static inline int sctp_packet_empty(struct sctp_packet *packet) 845{ 846 return (packet->size == packet->overhead); 847} 848 849/* This represents a remote transport address. 850 * For local transport addresses, we just use union sctp_addr. 851 * 852 * RFC2960 Section 1.4 Key Terms 853 * 854 * o Transport address: A Transport Address is traditionally defined 855 * by Network Layer address, Transport Layer protocol and Transport 856 * Layer port number. In the case of SCTP running over IP, a 857 * transport address is defined by the combination of an IP address 858 * and an SCTP port number (where SCTP is the Transport protocol). 859 * 860 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 861 * 862 * o The sender keeps a separate congestion control parameter set for 863 * each of the destination addresses it can send to (not each 864 * source-destination pair but for each destination). The parameters 865 * should decay if the address is not used for a long enough time 866 * period. 867 * 868 */ 869struct sctp_transport { 870 /* A list of transports. */ 871 struct list_head transports; 872 873 /* Reference counting. */ 874 atomic_t refcnt; 875 int dead; 876 877 /* This is the peer's IP address and port. */ 878 union sctp_addr ipaddr; 879 880 /* These are the functions we call to handle LLP stuff. */ 881 struct sctp_af *af_specific; 882 883 /* Which association do we belong to? */ 884 struct sctp_association *asoc; 885 886 /* RFC2960 887 * 888 * 12.3 Per Transport Address Data 889 * 890 * For each destination transport address in the peer's 891 * address list derived from the INIT or INIT ACK chunk, a 892 * number of data elements needs to be maintained including: 893 */ 894 /* RTO : The current retransmission timeout value. */ 895 unsigned long 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 1058struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1059 gfp_t); 1060void sctp_transport_set_owner(struct sctp_transport *, 1061 struct sctp_association *); 1062void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1063 struct sctp_sock *); 1064void sctp_transport_pmtu(struct sctp_transport *); 1065void sctp_transport_free(struct sctp_transport *); 1066void sctp_transport_reset_timers(struct sctp_transport *, int); 1067void sctp_transport_hold(struct sctp_transport *); 1068void sctp_transport_put(struct sctp_transport *); 1069void sctp_transport_update_rto(struct sctp_transport *, __u32); 1070void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1071void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1072unsigned long sctp_transport_timeout(struct sctp_transport *); 1073void sctp_transport_reset(struct sctp_transport *); 1074void 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 */ 1080struct 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 1098void sctp_inq_init(struct sctp_inq *); 1099void sctp_inq_free(struct sctp_inq *); 1100void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1101struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1102struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1103void 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 */ 1124struct 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 1169void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1170void sctp_outq_teardown(struct sctp_outq *); 1171void sctp_outq_free(struct sctp_outq*); 1172int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1173int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1174int sctp_outq_is_empty(const struct sctp_outq *); 1175void sctp_outq_restart(struct sctp_outq *); 1176 1177void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1178 sctp_retransmit_reason_t); 1179void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1180int sctp_outq_uncork(struct sctp_outq *); 1181/* Uncork and flush an outqueue. */ 1182static 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 */ 1188struct 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 1208void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1209void sctp_bind_addr_free(struct sctp_bind_addr *); 1210int 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); 1214int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1215 const struct sctp_bind_addr *src, 1216 gfp_t gfp); 1217int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1218 __u8 addr_state, gfp_t gfp); 1219int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1220int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1221 struct sctp_sock *); 1222int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1223 struct sctp_sock *, struct sctp_sock *); 1224int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1225 const union sctp_addr *addr); 1226union 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); 1230union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1231 int *addrs_len, 1232 gfp_t gfp); 1233int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1234 __u16 port, gfp_t gfp); 1235 1236sctp_scope_t sctp_scope(const union sctp_addr *); 1237int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1238int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1239int sctp_addr_is_valid(const union sctp_addr *addr); 1240 1241 1242/* What type of endpoint? */ 1243typedef 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 1264struct 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 1315struct 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. */ 1373static 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. */ 1382struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1383void sctp_endpoint_free(struct sctp_endpoint *); 1384void sctp_endpoint_put(struct sctp_endpoint *); 1385void sctp_endpoint_hold(struct sctp_endpoint *); 1386void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1387struct sctp_association *sctp_endpoint_lookup_assoc( 1388 const struct sctp_endpoint *ep, 1389 const union sctp_addr *paddr, 1390 struct sctp_transport **); 1391int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1392 const union sctp_addr *); 1393struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1394 const union sctp_addr *); 1395int sctp_has_association(const union sctp_addr *laddr, 1396 const union sctp_addr *paddr); 1397 1398int 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); 1401int 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 1407struct 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. */ 1429struct 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:1, /* Can peer do ECN? */ 1571 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1572 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1573 hostname_address:1, /* Peer understands DNS addresses? */ 1574 asconf_capable:1, /* Does peer support ADDIP? */ 1575 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1576 auth_capable:1; /* 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 /* Keeps treack of rwnd pressure. This happens when we have 1742 * a window, but not recevie buffer (i.e small packets). This one 1743 * is releases slowly (1 PMTU at a time ). 1744 */ 1745 __u32 rwnd_press; 1746 1747 /* This is the sndbuf size in use for the association. 1748 * This corresponds to the sndbuf size for the association, 1749 * as specified in the sk->sndbuf. 1750 */ 1751 int sndbuf_used; 1752 1753 /* This is the amount of memory that this association has allocated 1754 * in the receive path at any given time. 1755 */ 1756 atomic_t rmem_alloc; 1757 1758 /* This is the wait queue head for send requests waiting on 1759 * the association sndbuf space. 1760 */ 1761 wait_queue_head_t wait; 1762 1763 /* The message size at which SCTP fragmentation will occur. */ 1764 __u32 frag_point; 1765 __u32 user_frag; 1766 1767 /* Counter used to count INIT errors. */ 1768 int init_err_counter; 1769 1770 /* Count the number of INIT cycles (for doubling timeout). */ 1771 int init_cycle; 1772 1773 /* Default send parameters. */ 1774 __u16 default_stream; 1775 __u16 default_flags; 1776 __u32 default_ppid; 1777 __u32 default_context; 1778 __u32 default_timetolive; 1779 1780 /* Default receive parameters */ 1781 __u32 default_rcv_context; 1782 1783 /* This tracks outbound ssn for a given stream. */ 1784 struct sctp_ssnmap *ssnmap; 1785 1786 /* All outbound chunks go through this structure. */ 1787 struct sctp_outq outqueue; 1788 1789 /* A smart pipe that will handle reordering and fragmentation, 1790 * as well as handle passing events up to the ULP. 1791 */ 1792 struct sctp_ulpq ulpq; 1793 1794 /* Last TSN that caused an ECNE Chunk to be sent. */ 1795 __u32 last_ecne_tsn; 1796 1797 /* Last TSN that caused a CWR Chunk to be sent. */ 1798 __u32 last_cwr_tsn; 1799 1800 /* How many duplicated TSNs have we seen? */ 1801 int numduptsns; 1802 1803 /* Number of seconds of idle time before an association is closed. 1804 * In the association context, this is really used as a boolean 1805 * since the real timeout is stored in the timeouts array 1806 */ 1807 __u32 autoclose; 1808 1809 /* These are to support 1810 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1811 * and Enforcement of Flow and Message Limits" 1812 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1813 * or "ADDIP" for short. 1814 */ 1815 1816 1817 1818 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1819 * 1820 * R1) One and only one ASCONF Chunk MAY be in transit and 1821 * unacknowledged at any one time. If a sender, after sending 1822 * an ASCONF chunk, decides it needs to transfer another 1823 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1824 * returns from the previous ASCONF Chunk before sending a 1825 * subsequent ASCONF. Note this restriction binds each side, 1826 * so at any time two ASCONF may be in-transit on any given 1827 * association (one sent from each endpoint). 1828 * 1829 * [This is our one-and-only-one ASCONF in flight. If we do 1830 * not have an ASCONF in flight, this is NULL.] 1831 */ 1832 struct sctp_chunk *addip_last_asconf; 1833 1834 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1835 * 1836 * This is needed to implement itmes E1 - E4 of the updated 1837 * spec. Here is the justification: 1838 * 1839 * Since the peer may bundle multiple ASCONF chunks toward us, 1840 * we now need the ability to cache multiple ACKs. The section 1841 * describes in detail how they are cached and cleaned up. 1842 */ 1843 struct list_head asconf_ack_list; 1844 1845 /* These ASCONF chunks are waiting to be sent. 1846 * 1847 * These chunaks can't be pushed to outqueue until receiving 1848 * ASCONF_ACK for the previous ASCONF indicated by 1849 * addip_last_asconf, so as to guarantee that only one ASCONF 1850 * is in flight at any time. 1851 * 1852 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1853 * 1854 * In defining the ASCONF Chunk transfer procedures, it is 1855 * essential that these transfers MUST NOT cause congestion 1856 * within the network. To achieve this, we place these 1857 * restrictions on the transfer of ASCONF Chunks: 1858 * 1859 * R1) One and only one ASCONF Chunk MAY be in transit and 1860 * unacknowledged at any one time. If a sender, after sending 1861 * an ASCONF chunk, decides it needs to transfer another 1862 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1863 * returns from the previous ASCONF Chunk before sending a 1864 * subsequent ASCONF. Note this restriction binds each side, 1865 * so at any time two ASCONF may be in-transit on any given 1866 * association (one sent from each endpoint). 1867 * 1868 * 1869 * [I really think this is EXACTLY the sort of intelligence 1870 * which already resides in sctp_outq. Please move this 1871 * queue and its supporting logic down there. --piggy] 1872 */ 1873 struct list_head addip_chunk_list; 1874 1875 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1876 * 1877 * A2) A serial number should be assigned to the Chunk. The 1878 * serial number SHOULD be a monotonically increasing 1879 * number. The serial number SHOULD be initialized at 1880 * the start of the association to the same value as the 1881 * Initial TSN and every time a new ASCONF chunk is created 1882 * it is incremented by one after assigning the serial number 1883 * to the newly created chunk. 1884 * 1885 * ADDIP 1886 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1887 * 1888 * Serial Number : 32 bits (unsigned integer) 1889 * 1890 * This value represents a Serial Number for the ASCONF 1891 * Chunk. The valid range of Serial Number is from 0 to 1892 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1893 * after reaching 4294967295. 1894 */ 1895 __u32 addip_serial; 1896 1897 /* SCTP AUTH: list of the endpoint shared keys. These 1898 * keys are provided out of band by the user applicaton 1899 * and can't change during the lifetime of the association 1900 */ 1901 struct list_head endpoint_shared_keys; 1902 1903 /* SCTP AUTH: 1904 * The current generated assocaition shared key (secret) 1905 */ 1906 struct sctp_auth_bytes *asoc_shared_key; 1907 1908 /* SCTP AUTH: hmac id of the first peer requested algorithm 1909 * that we support. 1910 */ 1911 __u16 default_hmac_id; 1912 1913 __u16 active_key_id; 1914 1915 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1916 temp:1; /* Is it a temporary association? */ 1917}; 1918 1919 1920/* An eyecatcher for determining if we are really looking at an 1921 * association data structure. 1922 */ 1923enum { 1924 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1925}; 1926 1927/* Recover the outter association structure. */ 1928static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1929{ 1930 struct sctp_association *asoc; 1931 1932 asoc = container_of(base, struct sctp_association, base); 1933 return asoc; 1934} 1935 1936/* These are function signatures for manipulating associations. */ 1937 1938 1939struct sctp_association * 1940sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1941 sctp_scope_t scope, gfp_t gfp); 1942void sctp_association_free(struct sctp_association *); 1943void sctp_association_put(struct sctp_association *); 1944void sctp_association_hold(struct sctp_association *); 1945 1946struct sctp_transport *sctp_assoc_choose_alter_transport( 1947 struct sctp_association *, struct sctp_transport *); 1948void sctp_assoc_update_retran_path(struct sctp_association *); 1949struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1950 const union sctp_addr *); 1951int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1952 const union sctp_addr *laddr); 1953struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1954 const union sctp_addr *address, 1955 const gfp_t gfp, 1956 const int peer_state); 1957void sctp_assoc_del_peer(struct sctp_association *asoc, 1958 const union sctp_addr *addr); 1959void sctp_assoc_rm_peer(struct sctp_association *asoc, 1960 struct sctp_transport *peer); 1961void sctp_assoc_control_transport(struct sctp_association *, 1962 struct sctp_transport *, 1963 sctp_transport_cmd_t, sctp_sn_error_t); 1964struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1965struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1966 const union sctp_addr *, 1967 const union sctp_addr *); 1968void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1969void sctp_assoc_update(struct sctp_association *old, 1970 struct sctp_association *new); 1971 1972__u32 sctp_association_get_next_tsn(struct sctp_association *); 1973 1974void sctp_assoc_sync_pmtu(struct sctp_association *); 1975void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1976void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1977void sctp_assoc_set_primary(struct sctp_association *, 1978 struct sctp_transport *); 1979void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1980 struct sctp_transport *); 1981int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1982 sctp_scope_t, gfp_t); 1983int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1984 struct sctp_cookie*, 1985 gfp_t gfp); 1986int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1987void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1988struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1989 const struct sctp_association *asoc, 1990 __be32 serial); 1991 1992 1993int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1994 const union sctp_addr *ss2); 1995struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1996 1997/* A convenience structure to parse out SCTP specific CMSGs. */ 1998typedef struct sctp_cmsgs { 1999 struct sctp_initmsg *init; 2000 struct sctp_sndrcvinfo *info;
2001} sctp_cmsgs_t; 2002 2003/* Structure for tracking memory objects */ 2004typedef struct { 2005 char *label; 2006 atomic_t *counter; 2007} sctp_dbg_objcnt_entry_t; 2008 2009#endif /* __sctp_structs_h__ */ 2010