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; 234 235 /* Threshold for rwnd update SACKS. Receive buffer shifted this many 236 * bits is an indicator of when to send and window update SACK. 237 */ 238 int rwnd_update_shift; 239} sctp_globals; 240 241#define sctp_rto_initial (sctp_globals.rto_initial) 242#define sctp_rto_min (sctp_globals.rto_min) 243#define sctp_rto_max (sctp_globals.rto_max) 244#define sctp_rto_alpha (sctp_globals.rto_alpha) 245#define sctp_rto_beta (sctp_globals.rto_beta) 246#define sctp_max_burst (sctp_globals.max_burst) 247#define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) 248#define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) 249#define sctp_max_retrans_association (sctp_globals.max_retrans_association) 250#define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) 251#define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) 252#define sctp_max_retrans_path (sctp_globals.max_retrans_path) 253#define sctp_max_retrans_init (sctp_globals.max_retrans_init) 254#define sctp_sack_timeout (sctp_globals.sack_timeout) 255#define sctp_hb_interval (sctp_globals.hb_interval) 256#define sctp_max_instreams (sctp_globals.max_instreams) 257#define sctp_max_outstreams (sctp_globals.max_outstreams) 258#define sctp_address_families (sctp_globals.address_families) 259#define sctp_ep_hashsize (sctp_globals.ep_hashsize) 260#define sctp_ep_hashtable (sctp_globals.ep_hashtable) 261#define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) 262#define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) 263#define sctp_port_hashsize (sctp_globals.port_hashsize) 264#define sctp_port_rover (sctp_globals.port_rover) 265#define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) 266#define sctp_port_hashtable (sctp_globals.port_hashtable) 267#define sctp_local_addr_list (sctp_globals.local_addr_list) 268#define sctp_local_addr_lock (sctp_globals.addr_list_lock) 269#define sctp_scope_policy (sctp_globals.ipv4_scope_policy) 270#define sctp_addip_enable (sctp_globals.addip_enable) 271#define sctp_addip_noauth (sctp_globals.addip_noauth_enable) 272#define sctp_prsctp_enable (sctp_globals.prsctp_enable) 273#define sctp_auth_enable (sctp_globals.auth_enable) 274#define sctp_checksum_disable (sctp_globals.checksum_disable) 275#define sctp_rwnd_upd_shift (sctp_globals.rwnd_update_shift) 276 277/* SCTP Socket type: UDP or TCP style. */ 278typedef enum { 279 SCTP_SOCKET_UDP = 0, 280 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 281 SCTP_SOCKET_TCP 282} sctp_socket_type_t; 283 284/* Per socket SCTP information. */ 285struct sctp_sock { 286 /* inet_sock has to be the first member of sctp_sock */ 287 struct inet_sock inet; 288 /* What kind of a socket is this? */ 289 sctp_socket_type_t type; 290 291 /* PF_ family specific functions. */ 292 struct sctp_pf *pf; 293 294 /* Access to HMAC transform. */ 295 struct crypto_hash *hmac; 296 297 /* What is our base endpointer? */ 298 struct sctp_endpoint *ep; 299 300 struct sctp_bind_bucket *bind_hash; 301 /* Various Socket Options. */ 302 __u16 default_stream; 303 __u32 default_ppid; 304 __u16 default_flags; 305 __u32 default_context; 306 __u32 default_timetolive; 307 __u32 default_rcv_context; 308 int max_burst; 309 310 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 311 * the destination address every heartbeat interval. This value 312 * will be inherited by all new associations. 313 */ 314 __u32 hbinterval; 315 316 /* This is the max_retrans value for new associations. */ 317 __u16 pathmaxrxt; 318 319 /* The initial Path MTU to use for new associations. */ 320 __u32 pathmtu; 321 322 /* The default SACK delay timeout for new associations. */ 323 __u32 sackdelay; 324 __u32 sackfreq; 325 326 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 327 __u32 param_flags; 328 329 struct sctp_initmsg initmsg; 330 struct sctp_rtoinfo rtoinfo; 331 struct sctp_paddrparams paddrparam; 332 struct sctp_event_subscribe subscribe; 333 struct sctp_assocparams assocparams; 334 int user_frag; 335 __u32 autoclose; 336 __u8 nodelay; 337 __u8 disable_fragments; 338 __u8 v4mapped; 339 __u8 frag_interleave; 340 __u32 adaptation_ind; 341 __u32 pd_point; 342 343 atomic_t pd_mode; 344 /* Receive to here while partial delivery is in effect. */ 345 struct sk_buff_head pd_lobby; 346}; 347 348static inline struct sctp_sock *sctp_sk(const struct sock *sk) 349{ 350 return (struct sctp_sock *)sk; 351} 352 353static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 354{ 355 return (struct sock *)sp; 356} 357 358#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 359struct sctp6_sock { 360 struct sctp_sock sctp; 361 struct ipv6_pinfo inet6; 362}; 363#endif /* CONFIG_IPV6 */ 364 365 366/* This is our APPLICATION-SPECIFIC state cookie. 367 * THIS IS NOT DICTATED BY THE SPECIFICATION. 368 */ 369/* These are the parts of an association which we send in the cookie. 370 * Most of these are straight out of: 371 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 372 * 373 */ 374 375struct sctp_cookie { 376 377 /* My : Tag expected in every inbound packet and sent 378 * Verification: in the INIT or INIT ACK chunk. 379 * Tag : 380 */ 381 __u32 my_vtag; 382 383 /* Peer's : Tag expected in every outbound packet except 384 * Verification: in the INIT chunk. 385 * Tag : 386 */ 387 __u32 peer_vtag; 388 389 /* The rest of these are not from the spec, but really need to 390 * be in the cookie. 391 */ 392 393 /* My Tie Tag : Assist in discovering a restarting association. */ 394 __u32 my_ttag; 395 396 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 397 __u32 peer_ttag; 398 399 /* When does this cookie expire? */ 400 struct timeval expiration; 401 402 /* Number of inbound/outbound streams which are set 403 * and negotiated during the INIT process. 404 */ 405 __u16 sinit_num_ostreams; 406 __u16 sinit_max_instreams; 407 408 /* This is the first sequence number I used. */ 409 __u32 initial_tsn; 410 411 /* This holds the originating address of the INIT packet. */ 412 union sctp_addr peer_addr; 413 414 /* IG Section 2.35.3 415 * Include the source port of the INIT-ACK 416 */ 417 __u16 my_port; 418 419 __u8 prsctp_capable; 420 421 /* Padding for future use */ 422 __u8 padding; 423 424 __u32 adaptation_ind; 425 426 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 427 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 428 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 429 430 /* This is a shim for my peer's INIT packet, followed by 431 * a copy of the raw address list of the association. 432 * The length of the raw address list is saved in the 433 * raw_addr_list_len field, which will be used at the time when 434 * the association TCB is re-constructed from the cookie. 435 */ 436 __u32 raw_addr_list_len; 437 struct sctp_init_chunk peer_init[0]; 438}; 439 440 441/* The format of our cookie that we send to our peer. */ 442struct sctp_signed_cookie { 443 __u8 signature[SCTP_SECRET_SIZE]; 444 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 445 struct sctp_cookie c; 446} __packed; 447 448/* This is another convenience type to allocate memory for address 449 * params for the maximum size and pass such structures around 450 * internally. 451 */ 452union sctp_addr_param { 453 struct sctp_paramhdr p; 454 struct sctp_ipv4addr_param v4; 455 struct sctp_ipv6addr_param v6; 456}; 457 458/* A convenience type to allow walking through the various 459 * parameters and avoid casting all over the place. 460 */ 461union sctp_params { 462 void *v; 463 struct sctp_paramhdr *p; 464 struct sctp_cookie_preserve_param *life; 465 struct sctp_hostname_param *dns; 466 struct sctp_cookie_param *cookie; 467 struct sctp_supported_addrs_param *sat; 468 struct sctp_ipv4addr_param *v4; 469 struct sctp_ipv6addr_param *v6; 470 union sctp_addr_param *addr; 471 struct sctp_adaptation_ind_param *aind; 472 struct sctp_supported_ext_param *ext; 473 struct sctp_random_param *random; 474 struct sctp_chunks_param *chunks; 475 struct sctp_hmac_algo_param *hmac_algo; 476 struct sctp_addip_param *addip; 477}; 478 479/* RFC 2960. Section 3.3.5 Heartbeat. 480 * Heartbeat Information: variable length 481 * The Sender-specific Heartbeat Info field should normally include 482 * information about the sender's current time when this HEARTBEAT 483 * chunk is sent and the destination transport address to which this 484 * HEARTBEAT is sent (see Section 8.3). 485 */ 486typedef struct sctp_sender_hb_info { 487 struct sctp_paramhdr param_hdr; 488 union sctp_addr daddr; 489 unsigned long sent_at; 490 __u64 hb_nonce; 491} __packed sctp_sender_hb_info_t; 492 493/* 494 * RFC 2960 1.3.2 Sequenced Delivery within Streams 495 * 496 * The term "stream" is used in SCTP to refer to a sequence of user 497 * messages that are to be delivered to the upper-layer protocol in 498 * order with respect to other messages within the same stream. This is 499 * in contrast to its usage in TCP, where it refers to a sequence of 500 * bytes (in this document a byte is assumed to be eight bits). 501 * ... 502 * 503 * This is the structure we use to track both our outbound and inbound 504 * SSN, or Stream Sequence Numbers. 505 */ 506 507struct sctp_stream { 508 __u16 *ssn; 509 unsigned int len; 510}; 511 512struct sctp_ssnmap { 513 struct sctp_stream in; 514 struct sctp_stream out; 515 int malloced; 516}; 517 518struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 519 gfp_t gfp); 520void sctp_ssnmap_free(struct sctp_ssnmap *map); 521void sctp_ssnmap_clear(struct sctp_ssnmap *map); 522 523/* What is the current SSN number for this stream? */ 524static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 525{ 526 return stream->ssn[id]; 527} 528 529/* Return the next SSN number for this stream. */ 530static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 531{ 532 return stream->ssn[id]++; 533} 534 535/* Skip over this ssn and all below. */ 536static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 537 __u16 ssn) 538{ 539 stream->ssn[id] = ssn+1; 540} 541 542/* 543 * Pointers to address related SCTP functions. 544 * (i.e. things that depend on the address family.) 545 */ 546struct sctp_af { 547 int (*sctp_xmit) (struct sk_buff *skb, 548 struct sctp_transport *); 549 int (*setsockopt) (struct sock *sk, 550 int level, 551 int optname, 552 char __user *optval, 553 unsigned int optlen); 554 int (*getsockopt) (struct sock *sk, 555 int level, 556 int optname, 557 char __user *optval, 558 int __user *optlen); 559 int (*compat_setsockopt) (struct sock *sk, 560 int level, 561 int optname, 562 char __user *optval, 563 unsigned int optlen); 564 int (*compat_getsockopt) (struct sock *sk, 565 int level, 566 int optname, 567 char __user *optval, 568 int __user *optlen); 569 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 570 union sctp_addr *daddr, 571 union sctp_addr *saddr); 572 void (*get_saddr) (struct sctp_sock *sk, 573 struct sctp_association *asoc, 574 struct dst_entry *dst, 575 union sctp_addr *daddr, 576 union sctp_addr *saddr); 577 void (*copy_addrlist) (struct list_head *, 578 struct net_device *); 579 void (*dst_saddr) (union sctp_addr *saddr, 580 struct dst_entry *dst, 581 __be16 port); 582 int (*cmp_addr) (const union sctp_addr *addr1, 583 const union sctp_addr *addr2); 584 void (*addr_copy) (union sctp_addr *dst, 585 union sctp_addr *src); 586 void (*from_skb) (union sctp_addr *, 587 struct sk_buff *skb, 588 int saddr); 589 void (*from_sk) (union sctp_addr *, 590 struct sock *sk); 591 void (*to_sk_saddr) (union sctp_addr *, 592 struct sock *sk); 593 void (*to_sk_daddr) (union sctp_addr *, 594 struct sock *sk); 595 void (*from_addr_param) (union sctp_addr *, 596 union sctp_addr_param *, 597 __be16 port, int iif); 598 int (*to_addr_param) (const union sctp_addr *, 599 union sctp_addr_param *); 600 int (*addr_valid) (union sctp_addr *, 601 struct sctp_sock *, 602 const struct sk_buff *); 603 sctp_scope_t (*scope) (union sctp_addr *); 604 void (*inaddr_any) (union sctp_addr *, __be16); 605 int (*is_any) (const union sctp_addr *); 606 int (*available) (union sctp_addr *, 607 struct sctp_sock *); 608 int (*skb_iif) (const struct sk_buff *sk); 609 int (*is_ce) (const struct sk_buff *sk); 610 void (*seq_dump_addr)(struct seq_file *seq, 611 union sctp_addr *addr); 612 void (*ecn_capable)(struct sock *sk); 613 __u16 net_header_len; 614 int sockaddr_len; 615 sa_family_t sa_family; 616 struct list_head list; 617}; 618 619struct sctp_af *sctp_get_af_specific(sa_family_t); 620int sctp_register_af(struct sctp_af *); 621 622/* Protocol family functions. */ 623struct sctp_pf { 624 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 625 void (*skb_msgname) (struct sk_buff *, char *, int *); 626 int (*af_supported) (sa_family_t, struct sctp_sock *); 627 int (*cmp_addr) (const union sctp_addr *, 628 const union sctp_addr *, 629 struct sctp_sock *); 630 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 631 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 632 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 633 struct sock *(*create_accept_sk) (struct sock *sk, 634 struct sctp_association *asoc); 635 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 636 struct sctp_af *af; 637}; 638 639 640/* Structure to track chunk fragments that have been acked, but peer 641 * fragments of the same message have not. 642 */ 643struct sctp_datamsg { 644 /* Chunks waiting to be submitted to lower layer. */ 645 struct list_head chunks; 646 /* Reference counting. */ 647 atomic_t refcnt; 648 /* When is this message no longer interesting to the peer? */ 649 unsigned long expires_at; 650 /* Did the messenge fail to send? */ 651 int send_error; 652 u8 send_failed:1, 653 can_abandon:1, /* can chunks from this message can be abandoned. */ 654 can_delay; /* should this message be Nagle delayed */ 655}; 656 657struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 658 struct sctp_sndrcvinfo *, 659 struct msghdr *, int len); 660void sctp_datamsg_free(struct sctp_datamsg *); 661void sctp_datamsg_put(struct sctp_datamsg *); 662void sctp_chunk_fail(struct sctp_chunk *, int error); 663int sctp_chunk_abandoned(struct sctp_chunk *); 664 665/* RFC2960 1.4 Key Terms 666 * 667 * o Chunk: A unit of information within an SCTP packet, consisting of 668 * a chunk header and chunk-specific content. 669 * 670 * As a matter of convenience, we remember the SCTP common header for 671 * each chunk as well as a few other header pointers... 672 */ 673struct sctp_chunk { 674 struct list_head list; 675 676 atomic_t refcnt; 677 678 /* This is our link to the per-transport transmitted list. */ 679 struct list_head transmitted_list; 680 681 /* This field is used by chunks that hold fragmented data. 682 * For the first fragment this is the list that holds the rest of 683 * fragments. For the remaining fragments, this is the link to the 684 * frag_list maintained in the first fragment. 685 */ 686 struct list_head frag_list; 687 688 /* This points to the sk_buff containing the actual data. */ 689 struct sk_buff *skb; 690 691 /* These are the SCTP headers by reverse order in a packet. 692 * Note that some of these may happen more than once. In that 693 * case, we point at the "current" one, whatever that means 694 * for that level of header. 695 */ 696 697 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 698 union sctp_params param_hdr; 699 union { 700 __u8 *v; 701 struct sctp_datahdr *data_hdr; 702 struct sctp_inithdr *init_hdr; 703 struct sctp_sackhdr *sack_hdr; 704 struct sctp_heartbeathdr *hb_hdr; 705 struct sctp_sender_hb_info *hbs_hdr; 706 struct sctp_shutdownhdr *shutdown_hdr; 707 struct sctp_signed_cookie *cookie_hdr; 708 struct sctp_ecnehdr *ecne_hdr; 709 struct sctp_cwrhdr *ecn_cwr_hdr; 710 struct sctp_errhdr *err_hdr; 711 struct sctp_addiphdr *addip_hdr; 712 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 713 struct sctp_authhdr *auth_hdr; 714 } subh; 715 716 __u8 *chunk_end; 717 718 struct sctp_chunkhdr *chunk_hdr; 719 struct sctphdr *sctp_hdr; 720 721 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 722 struct sctp_sndrcvinfo sinfo; 723 724 /* Which association does this belong to? */ 725 struct sctp_association *asoc; 726 727 /* What endpoint received this chunk? */ 728 struct sctp_ep_common *rcvr; 729 730 /* We fill this in if we are calculating RTT. */ 731 unsigned long sent_at; 732 733 /* What is the origin IP address for this chunk? */ 734 union sctp_addr source; 735 /* Destination address for this chunk. */ 736 union sctp_addr dest; 737 738 /* For outbound message, track all fragments for SEND_FAILED. */ 739 struct sctp_datamsg *msg; 740 741 /* For an inbound chunk, this tells us where it came from. 742 * For an outbound chunk, it tells us where we'd like it to 743 * go. It is NULL if we have no preference. 744 */ 745 struct sctp_transport *transport; 746 747 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 748 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 749 * spec violates the principle premis that all chunks are processed 750 * in order. 751 */ 752 struct sk_buff *auth_chunk; 753 754#define SCTP_CAN_FRTX 0x0 755#define SCTP_NEED_FRTX 0x1 756#define SCTP_DONT_FRTX 0x2 757 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 758 has_tsn:1, /* Does this chunk have a TSN yet? */ 759 has_ssn:1, /* Does this chunk have a SSN yet? */ 760 singleton:1, /* Only chunk in the packet? */ 761 end_of_packet:1, /* Last chunk in the packet? */ 762 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 763 pdiscard:1, /* Discard the whole packet now? */ 764 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 765 data_accepted:1, /* At least 1 chunk accepted */ 766 auth:1, /* IN: was auth'ed | OUT: needs auth */ 767 has_asconf:1, /* IN: have seen an asconf before */ 768 tsn_missing_report:2, /* Data chunk missing counter. */ 769 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 770}; 771 772void sctp_chunk_hold(struct sctp_chunk *); 773void sctp_chunk_put(struct sctp_chunk *); 774int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 775 struct iovec *data); 776void sctp_chunk_free(struct sctp_chunk *); 777void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 778void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, const void *data); 779struct sctp_chunk *sctp_chunkify(struct sk_buff *, 780 const struct sctp_association *, 781 struct sock *); 782void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 783 union sctp_addr *); 784const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 785 786enum { 787 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 788 SCTP_ADDR_SRC, /* address can be used as source */ 789 SCTP_ADDR_DEL, /* address about to be deleted */ 790}; 791 792/* This is a structure for holding either an IPv6 or an IPv4 address. */ 793struct sctp_sockaddr_entry { 794 struct list_head list; 795 struct rcu_head rcu; 796 union sctp_addr a; 797 __u8 state; 798 __u8 valid; 799}; 800 801typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 802 803/* This structure holds lists of chunks as we are assembling for 804 * transmission. 805 */ 806struct sctp_packet { 807 /* These are the SCTP header values (host order) for the packet. */ 808 __u16 source_port; 809 __u16 destination_port; 810 __u32 vtag; 811 812 /* This contains the payload chunks. */ 813 struct list_head chunk_list; 814 815 /* This is the overhead of the sctp and ip headers. */ 816 size_t overhead; 817 /* This is the total size of all chunks INCLUDING padding. */ 818 size_t size; 819 820 /* The packet is destined for this transport address. 821 * The function we finally use to pass down to the next lower 822 * layer lives in the transport structure. 823 */ 824 struct sctp_transport *transport; 825 826 /* pointer to the auth chunk for this packet */ 827 struct sctp_chunk *auth; 828 829 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 830 has_sack:1, /* This packet contains a SACK chunk. */ 831 has_auth:1, /* This packet contains an AUTH chunk */ 832 has_data:1, /* This packet contains at least 1 DATA chunk */ 833 ipfragok:1, /* So let ip fragment this packet */ 834 malloced:1; /* Is it malloced? */ 835}; 836 837struct sctp_packet *sctp_packet_init(struct sctp_packet *, 838 struct sctp_transport *, 839 __u16 sport, __u16 dport); 840struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 841sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 842 struct sctp_chunk *, int); 843sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 844 struct sctp_chunk *); 845int sctp_packet_transmit(struct sctp_packet *); 846void sctp_packet_free(struct sctp_packet *); 847 848static inline int sctp_packet_empty(struct sctp_packet *packet) 849{ 850 return (packet->size == packet->overhead); 851} 852 853/* This represents a remote transport address. 854 * For local transport addresses, we just use union sctp_addr. 855 * 856 * RFC2960 Section 1.4 Key Terms 857 * 858 * o Transport address: A Transport Address is traditionally defined 859 * by Network Layer address, Transport Layer protocol and Transport 860 * Layer port number. In the case of SCTP running over IP, a 861 * transport address is defined by the combination of an IP address 862 * and an SCTP port number (where SCTP is the Transport protocol). 863 * 864 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 865 * 866 * o The sender keeps a separate congestion control parameter set for 867 * each of the destination addresses it can send to (not each 868 * source-destination pair but for each destination). The parameters 869 * should decay if the address is not used for a long enough time 870 * period. 871 * 872 */ 873struct sctp_transport { 874 /* A list of transports. */ 875 struct list_head transports; 876 877 /* Reference counting. */ 878 atomic_t refcnt; 879 __u32 dead:1, 880 /* RTO-Pending : A flag used to track if one of the DATA 881 * chunks sent to this address is currently being 882 * used to compute a RTT. If this flag is 0, 883 * the next DATA chunk sent to this destination 884 * should be used to compute a RTT and this flag 885 * should be set. Every time the RTT 886 * calculation completes (i.e. the DATA chunk 887 * is SACK'd) clear this flag. 888 */ 889 rto_pending:1, 890 891 /* 892 * hb_sent : a flag that signals that we have a pending 893 * heartbeat. 894 */ 895 hb_sent:1, 896 897 /* Is the Path MTU update pending on this tranport */ 898 pmtu_pending:1, 899 900 /* Is this structure kfree()able? */ 901 malloced:1; 902 903 904 /* This is the peer's IP address and port. */ 905 union sctp_addr ipaddr; 906 907 /* These are the functions we call to handle LLP stuff. */ 908 struct sctp_af *af_specific; 909 910 /* Which association do we belong to? */ 911 struct sctp_association *asoc; 912 913 /* RFC2960 914 * 915 * 12.3 Per Transport Address Data 916 * 917 * For each destination transport address in the peer's 918 * address list derived from the INIT or INIT ACK chunk, a 919 * number of data elements needs to be maintained including: 920 */ 921 /* RTO : The current retransmission timeout value. */ 922 unsigned long rto; 923 924 __u32 rtt; /* This is the most recent RTT. */ 925 926 /* RTTVAR : The current RTT variation. */ 927 __u32 rttvar; 928 929 /* SRTT : The current smoothed round trip time. */ 930 __u32 srtt; 931 932 /* 933 * These are the congestion stats. 934 */ 935 /* cwnd : The current congestion window. */ 936 __u32 cwnd; /* This is the actual cwnd. */ 937 938 /* ssthresh : The current slow start threshold value. */ 939 __u32 ssthresh; 940 941 /* partial : The tracking method for increase of cwnd when in 942 * bytes acked : congestion avoidance mode (see Section 6.2.2) 943 */ 944 __u32 partial_bytes_acked; 945 946 /* Data that has been sent, but not acknowledged. */ 947 __u32 flight_size; 948 949 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 950 951 /* Destination */ 952 struct dst_entry *dst; 953 /* Source address. */ 954 union sctp_addr saddr; 955 956 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 957 * the destination address every heartbeat interval. 958 */ 959 unsigned long hbinterval; 960 961 /* SACK delay timeout */ 962 unsigned long sackdelay; 963 __u32 sackfreq; 964 965 /* When was the last time (in jiffies) that we heard from this 966 * transport? We use this to pick new active and retran paths. 967 */ 968 unsigned long last_time_heard; 969 970 /* Last time(in jiffies) when cwnd is reduced due to the congestion 971 * indication based on ECNE chunk. 972 */ 973 unsigned long last_time_ecne_reduced; 974 975 /* This is the max_retrans value for the transport and will 976 * be initialized from the assocs value. This can be changed 977 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 978 */ 979 __u16 pathmaxrxt; 980 981 /* PMTU : The current known path MTU. */ 982 __u32 pathmtu; 983 984 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 985 __u32 param_flags; 986 987 /* The number of times INIT has been sent on this transport. */ 988 int init_sent_count; 989 990 /* state : The current state of this destination, 991 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 992 */ 993 int state; 994 995 /* These are the error stats for this destination. */ 996 997 /* Error count : The current error count for this destination. */ 998 unsigned short error_count; 999 1000 /* Per : A timer used by each destination. 1001 * Destination : 1002 * Timer : 1003 * 1004 * [Everywhere else in the text this is called T3-rtx. -ed] 1005 */ 1006 struct timer_list T3_rtx_timer; 1007 1008 /* Heartbeat timer is per destination. */ 1009 struct timer_list hb_timer; 1010 1011 /* Timer to handle ICMP proto unreachable envets */ 1012 struct timer_list proto_unreach_timer; 1013 1014 /* Since we're using per-destination retransmission timers 1015 * (see above), we're also using per-destination "transmitted" 1016 * queues. This probably ought to be a private struct 1017 * accessible only within the outqueue, but it's not, yet. 1018 */ 1019 struct list_head transmitted; 1020 1021 /* We build bundle-able packets for this transport here. */ 1022 struct sctp_packet packet; 1023 1024 /* This is the list of transports that have chunks to send. */ 1025 struct list_head send_ready; 1026 1027 /* State information saved for SFR_CACC algorithm. The key 1028 * idea in SFR_CACC is to maintain state at the sender on a 1029 * per-destination basis when a changeover happens. 1030 * char changeover_active; 1031 * char cycling_changeover; 1032 * __u32 next_tsn_at_change; 1033 * char cacc_saw_newack; 1034 */ 1035 struct { 1036 /* An unsigned integer, which stores the next TSN to be 1037 * used by the sender, at the moment of changeover. 1038 */ 1039 __u32 next_tsn_at_change; 1040 1041 /* A flag which indicates the occurrence of a changeover */ 1042 char changeover_active; 1043 1044 /* A flag which indicates whether the change of primary is 1045 * the first switch to this destination address during an 1046 * active switch. 1047 */ 1048 char cycling_changeover; 1049 1050 /* A temporary flag, which is used during the processing of 1051 * a SACK to estimate the causative TSN(s)'s group. 1052 */ 1053 char cacc_saw_newack; 1054 } cacc; 1055 1056 /* 64-bit random number sent with heartbeat. */ 1057 __u64 hb_nonce; 1058}; 1059 1060struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1061 gfp_t); 1062void sctp_transport_set_owner(struct sctp_transport *, 1063 struct sctp_association *); 1064void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1065 struct sctp_sock *); 1066void sctp_transport_pmtu(struct sctp_transport *); 1067void sctp_transport_free(struct sctp_transport *); 1068void sctp_transport_reset_timers(struct sctp_transport *); 1069void sctp_transport_hold(struct sctp_transport *); 1070void sctp_transport_put(struct sctp_transport *); 1071void sctp_transport_update_rto(struct sctp_transport *, __u32); 1072void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1073void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1074void sctp_transport_burst_limited(struct sctp_transport *); 1075void sctp_transport_burst_reset(struct sctp_transport *); 1076unsigned long sctp_transport_timeout(struct sctp_transport *); 1077void sctp_transport_reset(struct sctp_transport *); 1078void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1079 1080 1081/* This is the structure we use to queue packets as they come into 1082 * SCTP. We write packets to it and read chunks from it. 1083 */ 1084struct sctp_inq { 1085 /* This is actually a queue of sctp_chunk each 1086 * containing a partially decoded packet. 1087 */ 1088 struct list_head in_chunk_list; 1089 /* This is the packet which is currently off the in queue and is 1090 * being worked on through the inbound chunk processing. 1091 */ 1092 struct sctp_chunk *in_progress; 1093 1094 /* This is the delayed task to finish delivering inbound 1095 * messages. 1096 */ 1097 struct work_struct immediate; 1098 1099 int malloced; /* Is this structure kfree()able? */ 1100}; 1101 1102void sctp_inq_init(struct sctp_inq *); 1103void sctp_inq_free(struct sctp_inq *); 1104void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1105struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1106struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1107void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1108 1109/* This is the structure we use to hold outbound chunks. You push 1110 * chunks in and they automatically pop out the other end as bundled 1111 * packets (it calls (*output_handler)()). 1112 * 1113 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1114 * and 8.2 of the v13 draft. 1115 * 1116 * It handles retransmissions. The connection to the timeout portion 1117 * of the state machine is through sctp_..._timeout() and timeout_handler. 1118 * 1119 * If you feed it SACKs, it will eat them. 1120 * 1121 * If you give it big chunks, it will fragment them. 1122 * 1123 * It assigns TSN's to data chunks. This happens at the last possible 1124 * instant before transmission. 1125 * 1126 * When free()'d, it empties itself out via output_handler(). 1127 */ 1128struct sctp_outq { 1129 struct sctp_association *asoc; 1130 1131 /* Data pending that has never been transmitted. */ 1132 struct list_head out_chunk_list; 1133 1134 unsigned out_qlen; /* Total length of queued data chunks. */ 1135 1136 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1137 unsigned error; 1138 1139 /* These are control chunks we want to send. */ 1140 struct list_head control_chunk_list; 1141 1142 /* These are chunks that have been sacked but are above the 1143 * CTSN, or cumulative tsn ack point. 1144 */ 1145 struct list_head sacked; 1146 1147 /* Put chunks on this list to schedule them for 1148 * retransmission. 1149 */ 1150 struct list_head retransmit; 1151 1152 /* Put chunks on this list to save them for FWD TSN processing as 1153 * they were abandoned. 1154 */ 1155 struct list_head abandoned; 1156 1157 /* How many unackd bytes do we have in-flight? */ 1158 __u32 outstanding_bytes; 1159 1160 /* Are we doing fast-rtx on this queue */ 1161 char fast_rtx; 1162 1163 /* Corked? */ 1164 char cork; 1165 1166 /* Is this structure empty? */ 1167 char empty; 1168 1169 /* Are we kfree()able? */ 1170 char malloced; 1171}; 1172 1173void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1174void sctp_outq_teardown(struct sctp_outq *); 1175void sctp_outq_free(struct sctp_outq*); 1176int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1177int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1178int sctp_outq_is_empty(const struct sctp_outq *); 1179void sctp_outq_restart(struct sctp_outq *); 1180 1181void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1182 sctp_retransmit_reason_t); 1183void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1184int sctp_outq_uncork(struct sctp_outq *); 1185/* Uncork and flush an outqueue. */ 1186static inline void sctp_outq_cork(struct sctp_outq *q) 1187{ 1188 q->cork = 1; 1189} 1190 1191/* These bind address data fields common between endpoints and associations */ 1192struct sctp_bind_addr { 1193 1194 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1195 * 1196 * SCTP Port: The local SCTP port number the endpoint is 1197 * bound to. 1198 */ 1199 __u16 port; 1200 1201 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1202 * 1203 * Address List: The list of IP addresses that this instance 1204 * has bound. This information is passed to one's 1205 * peer(s) in INIT and INIT ACK chunks. 1206 */ 1207 struct list_head address_list; 1208 1209 int malloced; /* Are we kfree()able? */ 1210}; 1211 1212void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1213void sctp_bind_addr_free(struct sctp_bind_addr *); 1214int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1215 const struct sctp_bind_addr *src, 1216 sctp_scope_t scope, gfp_t gfp, 1217 int flags); 1218int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1219 const struct sctp_bind_addr *src, 1220 gfp_t gfp); 1221int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1222 __u8 addr_state, gfp_t gfp); 1223int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1224int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1225 struct sctp_sock *); 1226int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1227 struct sctp_sock *, struct sctp_sock *); 1228int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1229 const union sctp_addr *addr); 1230union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1231 const union sctp_addr *addrs, 1232 int addrcnt, 1233 struct sctp_sock *opt); 1234union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1235 int *addrs_len, 1236 gfp_t gfp); 1237int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1238 __u16 port, gfp_t gfp); 1239 1240sctp_scope_t sctp_scope(const union sctp_addr *); 1241int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1242int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1243int sctp_addr_is_valid(const union sctp_addr *addr); 1244 1245 1246/* What type of endpoint? */ 1247typedef enum { 1248 SCTP_EP_TYPE_SOCKET, 1249 SCTP_EP_TYPE_ASSOCIATION, 1250} sctp_endpoint_type_t; 1251 1252/* 1253 * A common base class to bridge the implmentation view of a 1254 * socket (usually listening) endpoint versus an association's 1255 * local endpoint. 1256 * This common structure is useful for several purposes: 1257 * 1) Common interface for lookup routines. 1258 * a) Subfunctions work for either endpoint or association 1259 * b) Single interface to lookup allows hiding the lookup lock rather 1260 * than acquiring it externally. 1261 * 2) Common interface for the inbound chunk handling/state machine. 1262 * 3) Common object handling routines for reference counting, etc. 1263 * 4) Disentangle association lookup from endpoint lookup, where we 1264 * do not have to find our endpoint to find our association. 1265 * 1266 */ 1267 1268struct sctp_ep_common { 1269 /* Fields to help us manage our entries in the hash tables. */ 1270 struct hlist_node node; 1271 int hashent; 1272 1273 /* Runtime type information. What kind of endpoint is this? */ 1274 sctp_endpoint_type_t type; 1275 1276 /* Some fields to help us manage this object. 1277 * refcnt - Reference count access to this object. 1278 * dead - Do not attempt to use this object. 1279 * malloced - Do we need to kfree this object? 1280 */ 1281 atomic_t refcnt; 1282 char dead; 1283 char malloced; 1284 1285 /* What socket does this endpoint belong to? */ 1286 struct sock *sk; 1287 1288 /* This is where we receive inbound chunks. */ 1289 struct sctp_inq inqueue; 1290 1291 /* This substructure includes the defining parameters of the 1292 * endpoint: 1293 * bind_addr.port is our shared port number. 1294 * bind_addr.address_list is our set of local IP addresses. 1295 */ 1296 struct sctp_bind_addr bind_addr; 1297}; 1298 1299 1300/* RFC Section 1.4 Key Terms 1301 * 1302 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1303 * multi-homed host, an SCTP endpoint is represented to its peers as a 1304 * combination of a set of eligible destination transport addresses to 1305 * which SCTP packets can be sent and a set of eligible source 1306 * transport addresses from which SCTP packets can be received. 1307 * All transport addresses used by an SCTP endpoint must use the 1308 * same port number, but can use multiple IP addresses. A transport 1309 * address used by an SCTP endpoint must not be used by another 1310 * SCTP endpoint. In other words, a transport address is unique 1311 * to an SCTP endpoint. 1312 * 1313 * From an implementation perspective, each socket has one of these. 1314 * A TCP-style socket will have exactly one association on one of 1315 * these. An UDP-style socket will have multiple associations hanging 1316 * off one of these. 1317 */ 1318 1319struct sctp_endpoint { 1320 /* Common substructure for endpoint and association. */ 1321 struct sctp_ep_common base; 1322 1323 /* Associations: A list of current associations and mappings 1324 * to the data consumers for each association. This 1325 * may be in the form of a hash table or other 1326 * implementation dependent structure. The data 1327 * consumers may be process identification 1328 * information such as file descriptors, named pipe 1329 * pointer, or table pointers dependent on how SCTP 1330 * is implemented. 1331 */ 1332 /* This is really a list of struct sctp_association entries. */ 1333 struct list_head asocs; 1334 1335 /* Secret Key: A secret key used by this endpoint to compute 1336 * the MAC. This SHOULD be a cryptographic quality 1337 * random number with a sufficient length. 1338 * Discussion in [RFC1750] can be helpful in 1339 * selection of the key. 1340 */ 1341 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1342 int current_key; 1343 int last_key; 1344 int key_changed_at; 1345 1346 /* digest: This is a digest of the sctp cookie. This field is 1347 * only used on the receive path when we try to validate 1348 * that the cookie has not been tampered with. We put 1349 * this here so we pre-allocate this once and can re-use 1350 * on every receive. 1351 */ 1352 __u8 *digest; 1353 1354 /* sendbuf acct. policy. */ 1355 __u32 sndbuf_policy; 1356 1357 /* rcvbuf acct. policy. */ 1358 __u32 rcvbuf_policy; 1359 1360 /* SCTP AUTH: array of the HMACs that will be allocated 1361 * we need this per association so that we don't serialize 1362 */ 1363 struct crypto_hash **auth_hmacs; 1364 1365 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1366 struct sctp_hmac_algo_param *auth_hmacs_list; 1367 1368 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1369 struct sctp_chunks_param *auth_chunk_list; 1370 1371 /* SCTP-AUTH: endpoint shared keys */ 1372 struct list_head endpoint_shared_keys; 1373 __u16 active_key_id; 1374}; 1375 1376/* Recover the outter endpoint structure. */ 1377static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1378{ 1379 struct sctp_endpoint *ep; 1380 1381 ep = container_of(base, struct sctp_endpoint, base); 1382 return ep; 1383} 1384 1385/* These are function signatures for manipulating endpoints. */ 1386struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1387void sctp_endpoint_free(struct sctp_endpoint *); 1388void sctp_endpoint_put(struct sctp_endpoint *); 1389void sctp_endpoint_hold(struct sctp_endpoint *); 1390void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1391struct sctp_association *sctp_endpoint_lookup_assoc( 1392 const struct sctp_endpoint *ep, 1393 const union sctp_addr *paddr, 1394 struct sctp_transport **); 1395int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1396 const union sctp_addr *); 1397struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1398 const union sctp_addr *); 1399int sctp_has_association(const union sctp_addr *laddr, 1400 const union sctp_addr *paddr); 1401 1402int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1403 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1404 struct sctp_chunk **err_chunk); 1405int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1406 const union sctp_addr *peer, 1407 sctp_init_chunk_t *init, gfp_t gfp); 1408__u32 sctp_generate_tag(const struct sctp_endpoint *); 1409__u32 sctp_generate_tsn(const struct sctp_endpoint *); 1410 1411struct sctp_inithdr_host { 1412 __u32 init_tag; 1413 __u32 a_rwnd; 1414 __u16 num_outbound_streams; 1415 __u16 num_inbound_streams; 1416 __u32 initial_tsn; 1417}; 1418 1419/* RFC2960 1420 * 1421 * 12. Recommended Transmission Control Block (TCB) Parameters 1422 * 1423 * This section details a recommended set of parameters that should 1424 * be contained within the TCB for an implementation. This section is 1425 * for illustrative purposes and should not be deemed as requirements 1426 * on an implementation or as an exhaustive list of all parameters 1427 * inside an SCTP TCB. Each implementation may need its own additional 1428 * parameters for optimization. 1429 */ 1430 1431 1432/* Here we have information about each individual association. */ 1433struct sctp_association { 1434 1435 /* A base structure common to endpoint and association. 1436 * In this context, it represents the associations's view 1437 * of the local endpoint of the association. 1438 */ 1439 struct sctp_ep_common base; 1440 1441 /* Associations on the same socket. */ 1442 struct list_head asocs; 1443 1444 /* association id. */ 1445 sctp_assoc_t assoc_id; 1446 1447 /* This is our parent endpoint. */ 1448 struct sctp_endpoint *ep; 1449 1450 /* These are those association elements needed in the cookie. */ 1451 struct sctp_cookie c; 1452 1453 /* This is all information about our peer. */ 1454 struct { 1455 /* rwnd 1456 * 1457 * Peer Rwnd : Current calculated value of the peer's rwnd. 1458 */ 1459 __u32 rwnd; 1460 1461 /* transport_addr_list 1462 * 1463 * Peer : A list of SCTP transport addresses that the 1464 * Transport : peer is bound to. This information is derived 1465 * Address : from the INIT or INIT ACK and is used to 1466 * List : associate an inbound packet with a given 1467 * : association. Normally this information is 1468 * : hashed or keyed for quick lookup and access 1469 * : of the TCB. 1470 * : The list is also initialized with the list 1471 * : of addresses passed with the sctp_connectx() 1472 * : call. 1473 * 1474 * It is a list of SCTP_transport's. 1475 */ 1476 struct list_head transport_addr_list; 1477 1478 /* transport_count 1479 * 1480 * Peer : A count of the number of peer addresses 1481 * Transport : in the Peer Transport Address List. 1482 * Address : 1483 * Count : 1484 */ 1485 __u16 transport_count; 1486 1487 /* port 1488 * The transport layer port number. 1489 */ 1490 __u16 port; 1491 1492 /* primary_path 1493 * 1494 * Primary : This is the current primary destination 1495 * Path : transport address of the peer endpoint. It 1496 * : may also specify a source transport address 1497 * : on this endpoint. 1498 * 1499 * All of these paths live on transport_addr_list. 1500 * 1501 * At the bakeoffs, we discovered that the intent of 1502 * primaryPath is that it only changes when the ULP 1503 * asks to have it changed. We add the activePath to 1504 * designate the connection we are currently using to 1505 * transmit new data and most control chunks. 1506 */ 1507 struct sctp_transport *primary_path; 1508 1509 /* Cache the primary path address here, when we 1510 * need a an address for msg_name. 1511 */ 1512 union sctp_addr primary_addr; 1513 1514 /* active_path 1515 * The path that we are currently using to 1516 * transmit new data and most control chunks. 1517 */ 1518 struct sctp_transport *active_path; 1519 1520 /* retran_path 1521 * 1522 * RFC2960 6.4 Multi-homed SCTP Endpoints 1523 * ... 1524 * Furthermore, when its peer is multi-homed, an 1525 * endpoint SHOULD try to retransmit a chunk to an 1526 * active destination transport address that is 1527 * different from the last destination address to 1528 * which the DATA chunk was sent. 1529 */ 1530 struct sctp_transport *retran_path; 1531 1532 /* Pointer to last transport I have sent on. */ 1533 struct sctp_transport *last_sent_to; 1534 1535 /* This is the last transport I have received DATA on. */ 1536 struct sctp_transport *last_data_from; 1537 1538 /* 1539 * Mapping An array of bits or bytes indicating which out of 1540 * Array order TSN's have been received (relative to the 1541 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1542 * order packets have been received, this array 1543 * will be set to all zero. This structure may be 1544 * in the form of a circular buffer or bit array. 1545 * 1546 * Last Rcvd : This is the last TSN received in 1547 * TSN : sequence. This value is set initially by 1548 * : taking the peer's Initial TSN, received in 1549 * : the INIT or INIT ACK chunk, and subtracting 1550 * : one from it. 1551 * 1552 * Throughout most of the specification this is called the 1553 * "Cumulative TSN ACK Point". In this case, we 1554 * ignore the advice in 12.2 in favour of the term 1555 * used in the bulk of the text. This value is hidden 1556 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1557 */ 1558 struct sctp_tsnmap tsn_map; 1559 1560 /* Ack State : This flag indicates if the next received 1561 * : packet is to be responded to with a 1562 * : SACK. This is initializedto 0. When a packet 1563 * : is received it is incremented. If this value 1564 * : reaches 2 or more, a SACK is sent and the 1565 * : value is reset to 0. Note: This is used only 1566 * : when no DATA chunks are received out of 1567 * : order. When DATA chunks are out of order, 1568 * : SACK's are not delayed (see Section 6). 1569 */ 1570 __u8 sack_needed; /* Do we need to sack the peer? */ 1571 __u32 sack_cnt; 1572 1573 /* These are capabilities which our peer advertised. */ 1574 __u8 ecn_capable:1, /* Can peer do ECN? */ 1575 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1576 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1577 hostname_address:1, /* Peer understands DNS addresses? */ 1578 asconf_capable:1, /* Does peer support ADDIP? */ 1579 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1580 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1581 1582 __u32 adaptation_ind; /* Adaptation Code point. */ 1583 1584 /* This mask is used to disable sending the ASCONF chunk 1585 * with specified parameter to peer. 1586 */ 1587 __be16 addip_disabled_mask; 1588 1589 struct sctp_inithdr_host i; 1590 int cookie_len; 1591 void *cookie; 1592 1593 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1594 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1595 * Initial TSN Value minus 1 1596 */ 1597 __u32 addip_serial; 1598 1599 /* SCTP-AUTH: We need to know pears random number, hmac list 1600 * and authenticated chunk list. All that is part of the 1601 * cookie and these are just pointers to those locations 1602 */ 1603 sctp_random_param_t *peer_random; 1604 sctp_chunks_param_t *peer_chunks; 1605 sctp_hmac_algo_param_t *peer_hmacs; 1606 } peer; 1607 1608 /* State : A state variable indicating what state the 1609 * : association is in, i.e. COOKIE-WAIT, 1610 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1611 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1612 * 1613 * Note: No "CLOSED" state is illustrated since if a 1614 * association is "CLOSED" its TCB SHOULD be removed. 1615 * 1616 * In this implementation we DO have a CLOSED 1617 * state which is used during initiation and shutdown. 1618 * 1619 * State takes values from SCTP_STATE_*. 1620 */ 1621 sctp_state_t state; 1622 1623 /* The cookie life I award for any cookie. */ 1624 struct timeval cookie_life; 1625 1626 /* Overall : The overall association error count. 1627 * Error Count : [Clear this any time I get something.] 1628 */ 1629 int overall_error_count; 1630 1631 /* These are the association's initial, max, and min RTO values. 1632 * These values will be initialized by system defaults, but can 1633 * be modified via the SCTP_RTOINFO socket option. 1634 */ 1635 unsigned long rto_initial; 1636 unsigned long rto_max; 1637 unsigned long rto_min; 1638 1639 /* Maximum number of new data packets that can be sent in a burst. */ 1640 int max_burst; 1641 1642 /* This is the max_retrans value for the association. This value will 1643 * be initialized initialized from system defaults, but can be 1644 * modified by the SCTP_ASSOCINFO socket option. 1645 */ 1646 int max_retrans; 1647 1648 /* Maximum number of times the endpoint will retransmit INIT */ 1649 __u16 max_init_attempts; 1650 1651 /* How many times have we resent an INIT? */ 1652 __u16 init_retries; 1653 1654 /* The largest timeout or RTO value to use in attempting an INIT */ 1655 unsigned long max_init_timeo; 1656 1657 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1658 * the destination address every heartbeat interval. This value 1659 * will be inherited by all new transports. 1660 */ 1661 unsigned long hbinterval; 1662 1663 /* This is the max_retrans value for new transports in the 1664 * association. 1665 */ 1666 __u16 pathmaxrxt; 1667 1668 /* Flag that path mtu update is pending */ 1669 __u8 pmtu_pending; 1670 1671 /* Association : The smallest PMTU discovered for all of the 1672 * PMTU : peer's transport addresses. 1673 */ 1674 __u32 pathmtu; 1675 1676 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1677 __u32 param_flags; 1678 1679 /* SACK delay timeout */ 1680 unsigned long sackdelay; 1681 __u32 sackfreq; 1682 1683 1684 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1685 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1686 1687 /* Transport to which SHUTDOWN chunk was last sent. */ 1688 struct sctp_transport *shutdown_last_sent_to; 1689 1690 /* How many times have we resent a SHUTDOWN */ 1691 int shutdown_retries; 1692 1693 /* Transport to which INIT chunk was last sent. */ 1694 struct sctp_transport *init_last_sent_to; 1695 1696 /* Next TSN : The next TSN number to be assigned to a new 1697 * : DATA chunk. This is sent in the INIT or INIT 1698 * : ACK chunk to the peer and incremented each 1699 * : time a DATA chunk is assigned a TSN 1700 * : (normally just prior to transmit or during 1701 * : fragmentation). 1702 */ 1703 __u32 next_tsn; 1704 1705 /* 1706 * Last Rcvd : This is the last TSN received in sequence. This value 1707 * TSN : is set initially by taking the peer's Initial TSN, 1708 * : received in the INIT or INIT ACK chunk, and 1709 * : subtracting one from it. 1710 * 1711 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1712 */ 1713 1714 __u32 ctsn_ack_point; 1715 1716 /* PR-SCTP Advanced.Peer.Ack.Point */ 1717 __u32 adv_peer_ack_point; 1718 1719 /* Highest TSN that is acknowledged by incoming SACKs. */ 1720 __u32 highest_sacked; 1721 1722 /* TSN marking the fast recovery exit point */ 1723 __u32 fast_recovery_exit; 1724 1725 /* Flag to track the current fast recovery state */ 1726 __u8 fast_recovery; 1727 1728 /* The number of unacknowledged data chunks. Reported through 1729 * the SCTP_STATUS sockopt. 1730 */ 1731 __u16 unack_data; 1732 1733 /* The total number of data chunks that we've had to retransmit 1734 * as the result of a T3 timer expiration 1735 */ 1736 __u32 rtx_data_chunks; 1737 1738 /* This is the association's receive buffer space. This value is used 1739 * to set a_rwnd field in an INIT or a SACK chunk. 1740 */ 1741 __u32 rwnd; 1742 1743 /* This is the last advertised value of rwnd over a SACK chunk. */ 1744 __u32 a_rwnd; 1745 1746 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1747 * to slop over a maximum of the association's frag_point. 1748 */ 1749 __u32 rwnd_over; 1750 1751 /* Keeps treack of rwnd pressure. This happens when we have 1752 * a window, but not recevie buffer (i.e small packets). This one 1753 * is releases slowly (1 PMTU at a time ). 1754 */ 1755 __u32 rwnd_press; 1756 1757 /* This is the sndbuf size in use for the association. 1758 * This corresponds to the sndbuf size for the association, 1759 * as specified in the sk->sndbuf. 1760 */ 1761 int sndbuf_used; 1762 1763 /* This is the amount of memory that this association has allocated 1764 * in the receive path at any given time. 1765 */ 1766 atomic_t rmem_alloc; 1767 1768 /* This is the wait queue head for send requests waiting on 1769 * the association sndbuf space. 1770 */ 1771 wait_queue_head_t wait; 1772 1773 /* The message size at which SCTP fragmentation will occur. */ 1774 __u32 frag_point; 1775 __u32 user_frag; 1776 1777 /* Counter used to count INIT errors. */ 1778 int init_err_counter; 1779 1780 /* Count the number of INIT cycles (for doubling timeout). */ 1781 int init_cycle; 1782 1783 /* Default send parameters. */ 1784 __u16 default_stream; 1785 __u16 default_flags; 1786 __u32 default_ppid; 1787 __u32 default_context; 1788 __u32 default_timetolive; 1789 1790 /* Default receive parameters */ 1791 __u32 default_rcv_context; 1792 1793 /* This tracks outbound ssn for a given stream. */ 1794 struct sctp_ssnmap *ssnmap; 1795 1796 /* All outbound chunks go through this structure. */ 1797 struct sctp_outq outqueue; 1798 1799 /* A smart pipe that will handle reordering and fragmentation, 1800 * as well as handle passing events up to the ULP. 1801 */ 1802 struct sctp_ulpq ulpq; 1803 1804 /* Last TSN that caused an ECNE Chunk to be sent. */ 1805 __u32 last_ecne_tsn; 1806 1807 /* Last TSN that caused a CWR Chunk to be sent. */ 1808 __u32 last_cwr_tsn; 1809 1810 /* How many duplicated TSNs have we seen? */ 1811 int numduptsns; 1812 1813 /* Number of seconds of idle time before an association is closed. 1814 * In the association context, this is really used as a boolean 1815 * since the real timeout is stored in the timeouts array 1816 */ 1817 __u32 autoclose; 1818 1819 /* These are to support 1820 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1821 * and Enforcement of Flow and Message Limits" 1822 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1823 * or "ADDIP" for short. 1824 */ 1825 1826 1827 1828 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1829 * 1830 * R1) One and only one ASCONF Chunk MAY be in transit and 1831 * unacknowledged at any one time. If a sender, after sending 1832 * an ASCONF chunk, decides it needs to transfer another 1833 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1834 * returns from the previous ASCONF Chunk before sending a 1835 * subsequent ASCONF. Note this restriction binds each side, 1836 * so at any time two ASCONF may be in-transit on any given 1837 * association (one sent from each endpoint). 1838 * 1839 * [This is our one-and-only-one ASCONF in flight. If we do 1840 * not have an ASCONF in flight, this is NULL.] 1841 */ 1842 struct sctp_chunk *addip_last_asconf; 1843 1844 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1845 * 1846 * This is needed to implement itmes E1 - E4 of the updated 1847 * spec. Here is the justification: 1848 * 1849 * Since the peer may bundle multiple ASCONF chunks toward us, 1850 * we now need the ability to cache multiple ACKs. The section 1851 * describes in detail how they are cached and cleaned up. 1852 */ 1853 struct list_head asconf_ack_list; 1854 1855 /* These ASCONF chunks are waiting to be sent. 1856 * 1857 * These chunaks can't be pushed to outqueue until receiving 1858 * ASCONF_ACK for the previous ASCONF indicated by 1859 * addip_last_asconf, so as to guarantee that only one ASCONF 1860 * is in flight at any time. 1861 * 1862 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1863 * 1864 * In defining the ASCONF Chunk transfer procedures, it is 1865 * essential that these transfers MUST NOT cause congestion 1866 * within the network. To achieve this, we place these 1867 * restrictions on the transfer of ASCONF Chunks: 1868 * 1869 * R1) One and only one ASCONF Chunk MAY be in transit and 1870 * unacknowledged at any one time. If a sender, after sending 1871 * an ASCONF chunk, decides it needs to transfer another 1872 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1873 * returns from the previous ASCONF Chunk before sending a 1874 * subsequent ASCONF. Note this restriction binds each side, 1875 * so at any time two ASCONF may be in-transit on any given 1876 * association (one sent from each endpoint). 1877 * 1878 * 1879 * [I really think this is EXACTLY the sort of intelligence 1880 * which already resides in sctp_outq. Please move this 1881 * queue and its supporting logic down there. --piggy] 1882 */ 1883 struct list_head addip_chunk_list; 1884 1885 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1886 * 1887 * A2) A serial number should be assigned to the Chunk. The 1888 * serial number SHOULD be a monotonically increasing 1889 * number. The serial number SHOULD be initialized at 1890 * the start of the association to the same value as the 1891 * Initial TSN and every time a new ASCONF chunk is created 1892 * it is incremented by one after assigning the serial number 1893 * to the newly created chunk. 1894 * 1895 * ADDIP 1896 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1897 * 1898 * Serial Number : 32 bits (unsigned integer) 1899 * 1900 * This value represents a Serial Number for the ASCONF 1901 * Chunk. The valid range of Serial Number is from 0 to 1902 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1903 * after reaching 4294967295. 1904 */ 1905 __u32 addip_serial; 1906 1907 /* SCTP AUTH: list of the endpoint shared keys. These 1908 * keys are provided out of band by the user applicaton 1909 * and can't change during the lifetime of the association 1910 */ 1911 struct list_head endpoint_shared_keys; 1912 1913 /* SCTP AUTH: 1914 * The current generated assocaition shared key (secret) 1915 */ 1916 struct sctp_auth_bytes *asoc_shared_key; 1917 1918 /* SCTP AUTH: hmac id of the first peer requested algorithm 1919 * that we support. 1920 */ 1921 __u16 default_hmac_id; 1922 1923 __u16 active_key_id; 1924 1925 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1926 temp:1; /* Is it a temporary association? */ 1927}; 1928 1929 1930/* An eyecatcher for determining if we are really looking at an 1931 * association data structure. 1932 */ 1933enum { 1934 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1935}; 1936 1937/* Recover the outter association structure. */ 1938static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1939{ 1940 struct sctp_association *asoc; 1941 1942 asoc = container_of(base, struct sctp_association, base); 1943 return asoc; 1944} 1945 1946/* These are function signatures for manipulating associations. */ 1947 1948 1949struct sctp_association * 1950sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1951 sctp_scope_t scope, gfp_t gfp); 1952void sctp_association_free(struct sctp_association *); 1953void sctp_association_put(struct sctp_association *); 1954void sctp_association_hold(struct sctp_association *); 1955 1956struct sctp_transport *sctp_assoc_choose_alter_transport( 1957 struct sctp_association *, struct sctp_transport *); 1958void sctp_assoc_update_retran_path(struct sctp_association *); 1959struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1960 const union sctp_addr *); 1961int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1962 const union sctp_addr *laddr); 1963struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1964 const union sctp_addr *address, 1965 const gfp_t gfp, 1966 const int peer_state); 1967void sctp_assoc_del_peer(struct sctp_association *asoc, 1968 const union sctp_addr *addr); 1969void sctp_assoc_rm_peer(struct sctp_association *asoc, 1970 struct sctp_transport *peer); 1971void sctp_assoc_control_transport(struct sctp_association *, 1972 struct sctp_transport *, 1973 sctp_transport_cmd_t, sctp_sn_error_t); 1974struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1975struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1976 const union sctp_addr *, 1977 const union sctp_addr *); 1978void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1979void sctp_assoc_update(struct sctp_association *old, 1980 struct sctp_association *new); 1981 1982__u32 sctp_association_get_next_tsn(struct sctp_association *); 1983 1984void sctp_assoc_sync_pmtu(struct sctp_association *); 1985void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1986void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1987void sctp_assoc_set_primary(struct sctp_association *, 1988 struct sctp_transport *); 1989void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1990 struct sctp_transport *); 1991int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1992 sctp_scope_t, gfp_t); 1993int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1994 struct sctp_cookie*, 1995 gfp_t gfp); 1996int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1997void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1998struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1999 const struct sctp_association *asoc, 2000 __be32 serial); 2001 2002 2003int sctp_cmp_addr_exact(const union sctp_addr *ss1, 2004 const union sctp_addr *ss2); 2005struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2006 2007/* A convenience structure to parse out SCTP specific CMSGs. */ 2008typedef struct sctp_cmsgs { 2009 struct sctp_initmsg *init; 2010 struct sctp_sndrcvinfo *info; 2011} sctp_cmsgs_t; 2012 2013/* Structure for tracking memory objects */ 2014typedef struct { 2015 char *label; 2016 atomic_t *counter; 2017} sctp_dbg_objcnt_entry_t; 2018 2019#endif /* __sctp_structs_h__ */ 2020