1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * This SCTP implementation is free software; 10 * you can redistribute it and/or modify it under the terms of 11 * the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This SCTP implementation is distributed in the hope that it 16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 17 * ************************ 18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 19 * See the GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with GNU CC; see the file COPYING. If not, write to 23 * the Free Software Foundation, 59 Temple Place - Suite 330, 24 * Boston, MA 02111-1307, USA. 25 * 26 * Please send any bug reports or fixes you make to the 27 * email addresses: 28 * lksctp developers <lksctp-developers@lists.sourceforge.net> 29 * 30 * Or submit a bug report through the following website: 31 * http://www.sf.net/projects/lksctp 32 * 33 * Written or modified by: 34 * Randall Stewart <randall@sctp.chicago.il.us> 35 * Ken Morneau <kmorneau@cisco.com> 36 * Qiaobing Xie <qxie1@email.mot.com> 37 * La Monte H.P. Yarroll <piggy@acm.org> 38 * Karl Knutson <karl@athena.chicago.il.us> 39 * Jon Grimm <jgrimm@us.ibm.com> 40 * Xingang Guo <xingang.guo@intel.com> 41 * Hui Huang <hui.huang@nokia.com> 42 * Sridhar Samudrala <sri@us.ibm.com> 43 * Daisy Chang <daisyc@us.ibm.com> 44 * Dajiang Zhang <dajiang.zhang@nokia.com> 45 * Ardelle Fan <ardelle.fan@intel.com> 46 * Ryan Layer <rmlayer@us.ibm.com> 47 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 48 * Kevin Gao <kevin.gao@intel.com> 49 * 50 * Any bugs reported given to us we will try to fix... any fixes shared will 51 * be incorporated into the next SCTP release. 52 */ 53 54 #ifndef __sctp_structs_h__ 55 #define __sctp_structs_h__ 56 57 #include <linux/time.h> /* We get struct timespec. */ 58 #include <linux/socket.h> /* linux/in.h needs this!! */ 59 #include <linux/in.h> /* We get struct sockaddr_in. */ 60 #include <linux/in6.h> /* We get struct in6_addr */ 61 #include <linux/ipv6.h> 62 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 63 #include <asm/atomic.h> /* This gets us atomic counters. */ 64 #include <linux/skbuff.h> /* We need sk_buff_head. */ 65 #include <linux/workqueue.h> /* We need tq_struct. */ 66 #include <linux/sctp.h> /* We need sctp* header structs. */ 67 #include <net/sctp/auth.h> /* We need auth specific structs */ 68 69 /* A convenience structure for handling sockaddr structures. 70 * We should wean ourselves off this. 71 */ 72 union sctp_addr { 73 struct sockaddr_in v4; 74 struct sockaddr_in6 v6; 75 struct sockaddr sa; 76 }; 77 78 /* Forward declarations for data structures. */ 79 struct sctp_globals; 80 struct sctp_endpoint; 81 struct sctp_association; 82 struct sctp_transport; 83 struct sctp_packet; 84 struct sctp_chunk; 85 struct sctp_inq; 86 struct sctp_outq; 87 struct sctp_bind_addr; 88 struct sctp_ulpq; 89 struct sctp_ep_common; 90 struct sctp_ssnmap; 91 struct crypto_hash; 92 93 94 #include <net/sctp/tsnmap.h> 95 #include <net/sctp/ulpevent.h> 96 #include <net/sctp/ulpqueue.h> 97 98 /* Structures useful for managing bind/connect. */ 99 100 struct sctp_bind_bucket { 101 unsigned short port; 102 unsigned short fastreuse; 103 struct hlist_node node; 104 struct hlist_head owner; 105 }; 106 107 struct sctp_bind_hashbucket { 108 spinlock_t lock; 109 struct hlist_head chain; 110 }; 111 112 /* Used for hashing all associations. */ 113 struct sctp_hashbucket { 114 rwlock_t lock; 115 struct hlist_head chain; 116 } __attribute__((__aligned__(8))); 117 118 119 /* The SCTP globals structure. */ 120 extern struct sctp_globals { 121 /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values 122 * 123 * The following protocol parameters are RECOMMENDED: 124 * 125 * RTO.Initial - 3 seconds 126 * RTO.Min - 1 second 127 * RTO.Max - 60 seconds 128 * RTO.Alpha - 1/8 (3 when converted to right shifts.) 129 * RTO.Beta - 1/4 (2 when converted to right shifts.) 130 */ 131 unsigned int rto_initial; 132 unsigned int rto_min; 133 unsigned int rto_max; 134 135 /* Note: rto_alpha and rto_beta are really defined as inverse 136 * powers of two to facilitate integer operations. 137 */ 138 int rto_alpha; 139 int rto_beta; 140 141 /* Max.Burst - 4 */ 142 int max_burst; 143 144 /* Whether Cookie Preservative is enabled(1) or not(0) */ 145 int cookie_preserve_enable; 146 147 /* Valid.Cookie.Life - 60 seconds */ 148 unsigned int valid_cookie_life; 149 150 /* Delayed SACK timeout 200ms default*/ 151 unsigned int sack_timeout; 152 153 /* HB.interval - 30 seconds */ 154 unsigned int hb_interval; 155 156 /* Association.Max.Retrans - 10 attempts 157 * Path.Max.Retrans - 5 attempts (per destination address) 158 * Max.Init.Retransmits - 8 attempts 159 */ 160 int max_retrans_association; 161 int max_retrans_path; 162 int max_retrans_init; 163 164 /* 165 * Policy for preforming sctp/socket accounting 166 * 0 - do socket level accounting, all assocs share sk_sndbuf 167 * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes 168 */ 169 int sndbuf_policy; 170 171 /* 172 * Policy for preforming sctp/socket accounting 173 * 0 - do socket level accounting, all assocs share sk_rcvbuf 174 * 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes 175 */ 176 int rcvbuf_policy; 177 178 /* The following variables are implementation specific. */ 179 180 /* Default initialization values to be applied to new associations. */ 181 __u16 max_instreams; 182 __u16 max_outstreams; 183 184 /* This is a list of groups of functions for each address 185 * family that we support. 186 */ 187 struct list_head address_families; 188 189 /* This is the hash of all endpoints. */ 190 int ep_hashsize; 191 struct sctp_hashbucket *ep_hashtable; 192 193 /* This is the hash of all associations. */ 194 int assoc_hashsize; 195 struct sctp_hashbucket *assoc_hashtable; 196 197 /* This is the sctp port control hash. */ 198 int port_hashsize; 199 struct sctp_bind_hashbucket *port_hashtable; 200 201 /* This is the global local address list. 202 * We actively maintain this complete list of addresses on 203 * the system by catching address add/delete events. 204 * 205 * It is a list of sctp_sockaddr_entry. 206 */ 207 struct list_head local_addr_list; 208 209 /* Lock that protects the local_addr_list writers */ 210 spinlock_t addr_list_lock; 211 212 /* Flag to indicate if addip is enabled. */ 213 int addip_enable; 214 int addip_noauth_enable; 215 216 /* Flag to indicate if PR-SCTP is enabled. */ 217 int prsctp_enable; 218 219 /* Flag to idicate if SCTP-AUTH is enabled */ 220 int auth_enable; 221 222 /* 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. */ 278 typedef 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. */ 285 struct 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 }; 347 348 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 349 { 350 return (struct sctp_sock *)sk; 351 } 352 353 static 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) 359 struct 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 */ 374 375 struct 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. */ 442 struct 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 } __attribute__((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 */ 452 union 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 */ 461 union 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 */ 486 typedef 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 } __attribute__((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 */ 506 507 struct sctp_stream { 508 __u16 *ssn; 509 unsigned int len; 510 }; 511 512 struct sctp_ssnmap { 513 struct sctp_stream in; 514 struct sctp_stream out; 515 int malloced; 516 }; 517 518 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 519 gfp_t gfp); 520 void sctp_ssnmap_free(struct sctp_ssnmap *map); 521 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 522 523 /* What is the current SSN number for this stream? */ 524 static 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. */ 530 static 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. */ 536 static 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 */ 546 struct 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 }; 618 619 struct sctp_af *sctp_get_af_specific(sa_family_t); 620 int sctp_register_af(struct sctp_af *); 621 622 /* Protocol family functions. */ 623 struct 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 */ 643 struct sctp_datamsg { 644 /* Chunks waiting to be submitted to lower layer. */ 645 struct list_head chunks; 646 /* Chunks that have been transmitted. */ 647 size_t msg_size; 648 /* Reference counting. */ 649 atomic_t refcnt; 650 /* When is this message no longer interesting to the peer? */ 651 unsigned long expires_at; 652 /* Did the messenge fail to send? */ 653 int send_error; 654 char send_failed; 655 /* Control whether chunks from this message can be abandoned. */ 656 char can_abandon; 657 }; 658 659 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 660 struct sctp_sndrcvinfo *, 661 struct msghdr *, int len); 662 void sctp_datamsg_free(struct sctp_datamsg *); 663 void sctp_datamsg_put(struct sctp_datamsg *); 664 void sctp_chunk_fail(struct sctp_chunk *, int error); 665 int sctp_chunk_abandoned(struct sctp_chunk *); 666 667 /* RFC2960 1.4 Key Terms 668 * 669 * o Chunk: A unit of information within an SCTP packet, consisting of 670 * a chunk header and chunk-specific content. 671 * 672 * As a matter of convenience, we remember the SCTP common header for 673 * each chunk as well as a few other header pointers... 674 */ 675 struct sctp_chunk { 676 struct list_head list; 677 678 atomic_t refcnt; 679 680 /* This is our link to the per-transport transmitted list. */ 681 struct list_head transmitted_list; 682 683 /* This field is used by chunks that hold fragmented data. 684 * For the first fragment this is the list that holds the rest of 685 * fragments. For the remaining fragments, this is the link to the 686 * frag_list maintained in the first fragment. 687 */ 688 struct list_head frag_list; 689 690 /* This points to the sk_buff containing the actual data. */ 691 struct sk_buff *skb; 692 693 /* These are the SCTP headers by reverse order in a packet. 694 * Note that some of these may happen more than once. In that 695 * case, we point at the "current" one, whatever that means 696 * for that level of header. 697 */ 698 699 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 700 union sctp_params param_hdr; 701 union { 702 __u8 *v; 703 struct sctp_datahdr *data_hdr; 704 struct sctp_inithdr *init_hdr; 705 struct sctp_sackhdr *sack_hdr; 706 struct sctp_heartbeathdr *hb_hdr; 707 struct sctp_sender_hb_info *hbs_hdr; 708 struct sctp_shutdownhdr *shutdown_hdr; 709 struct sctp_signed_cookie *cookie_hdr; 710 struct sctp_ecnehdr *ecne_hdr; 711 struct sctp_cwrhdr *ecn_cwr_hdr; 712 struct sctp_errhdr *err_hdr; 713 struct sctp_addiphdr *addip_hdr; 714 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 715 struct sctp_authhdr *auth_hdr; 716 } subh; 717 718 __u8 *chunk_end; 719 720 struct sctp_chunkhdr *chunk_hdr; 721 struct sctphdr *sctp_hdr; 722 723 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 724 struct sctp_sndrcvinfo sinfo; 725 726 /* Which association does this belong to? */ 727 struct sctp_association *asoc; 728 729 /* What endpoint received this chunk? */ 730 struct sctp_ep_common *rcvr; 731 732 /* We fill this in if we are calculating RTT. */ 733 unsigned long sent_at; 734 735 /* What is the origin IP address for this chunk? */ 736 union sctp_addr source; 737 /* Destination address for this chunk. */ 738 union sctp_addr dest; 739 740 /* For outbound message, track all fragments for SEND_FAILED. */ 741 struct sctp_datamsg *msg; 742 743 /* For an inbound chunk, this tells us where it came from. 744 * For an outbound chunk, it tells us where we'd like it to 745 * go. It is NULL if we have no preference. 746 */ 747 struct sctp_transport *transport; 748 749 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 750 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 751 * spec violates the principle premis that all chunks are processed 752 * in order. 753 */ 754 struct sk_buff *auth_chunk; 755 756 #define SCTP_CAN_FRTX 0x0 757 #define SCTP_NEED_FRTX 0x1 758 #define SCTP_DONT_FRTX 0x2 759 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 760 resent:1, /* Has this chunk ever been resent. */ 761 has_tsn:1, /* Does this chunk have a TSN yet? */ 762 has_ssn:1, /* Does this chunk have a SSN yet? */ 763 singleton:1, /* Only chunk in the packet? */ 764 end_of_packet:1, /* Last chunk in the packet? */ 765 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 766 pdiscard:1, /* Discard the whole packet now? */ 767 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 768 data_accepted:1, /* At least 1 chunk accepted */ 769 auth:1, /* IN: was auth'ed | OUT: needs auth */ 770 has_asconf:1, /* IN: have seen an asconf before */ 771 tsn_missing_report:2, /* Data chunk missing counter. */ 772 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 773 }; 774 775 void sctp_chunk_hold(struct sctp_chunk *); 776 void sctp_chunk_put(struct sctp_chunk *); 777 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 778 struct iovec *data); 779 void sctp_chunk_free(struct sctp_chunk *); 780 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 781 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 782 const struct sctp_association *, 783 struct sock *); 784 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 785 union sctp_addr *); 786 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 787 788 enum { 789 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 790 SCTP_ADDR_SRC, /* address can be used as source */ 791 SCTP_ADDR_DEL, /* address about to be deleted */ 792 }; 793 794 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 795 struct sctp_sockaddr_entry { 796 struct list_head list; 797 struct rcu_head rcu; 798 union sctp_addr a; 799 __u8 state; 800 __u8 valid; 801 }; 802 803 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 804 805 /* This structure holds lists of chunks as we are assembling for 806 * transmission. 807 */ 808 struct sctp_packet { 809 /* These are the SCTP header values (host order) for the packet. */ 810 __u16 source_port; 811 __u16 destination_port; 812 __u32 vtag; 813 814 /* This contains the payload chunks. */ 815 struct list_head chunk_list; 816 817 /* This is the overhead of the sctp and ip headers. */ 818 size_t overhead; 819 /* This is the total size of all chunks INCLUDING padding. */ 820 size_t size; 821 822 /* The packet is destined for this transport address. 823 * The function we finally use to pass down to the next lower 824 * layer lives in the transport structure. 825 */ 826 struct sctp_transport *transport; 827 828 /* pointer to the auth chunk for this packet */ 829 struct sctp_chunk *auth; 830 831 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 832 has_sack:1, /* This packet contains a SACK chunk. */ 833 has_auth:1, /* This packet contains an AUTH chunk */ 834 has_data:1, /* This packet contains at least 1 DATA chunk */ 835 ipfragok:1, /* So let ip fragment this packet */ 836 malloced:1; /* Is it malloced? */ 837 }; 838 839 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 840 struct sctp_transport *, 841 __u16 sport, __u16 dport); 842 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 843 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 844 struct sctp_chunk *, int); 845 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 846 struct sctp_chunk *); 847 int sctp_packet_transmit(struct sctp_packet *); 848 void sctp_packet_free(struct sctp_packet *); 849 850 static inline int sctp_packet_empty(struct sctp_packet *packet) 851 { 852 return (packet->size == packet->overhead); 853 } 854 855 /* This represents a remote transport address. 856 * For local transport addresses, we just use union sctp_addr. 857 * 858 * RFC2960 Section 1.4 Key Terms 859 * 860 * o Transport address: A Transport Address is traditionally defined 861 * by Network Layer address, Transport Layer protocol and Transport 862 * Layer port number. In the case of SCTP running over IP, a 863 * transport address is defined by the combination of an IP address 864 * and an SCTP port number (where SCTP is the Transport protocol). 865 * 866 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 867 * 868 * o The sender keeps a separate congestion control parameter set for 869 * each of the destination addresses it can send to (not each 870 * source-destination pair but for each destination). The parameters 871 * should decay if the address is not used for a long enough time 872 * period. 873 * 874 */ 875 struct sctp_transport { 876 /* A list of transports. */ 877 struct list_head transports; 878 879 /* Reference counting. */ 880 atomic_t refcnt; 881 int dead; 882 883 /* This is the peer's IP address and port. */ 884 union sctp_addr ipaddr; 885 886 /* These are the functions we call to handle LLP stuff. */ 887 struct sctp_af *af_specific; 888 889 /* Which association do we belong to? */ 890 struct sctp_association *asoc; 891 892 /* RFC2960 893 * 894 * 12.3 Per Transport Address Data 895 * 896 * For each destination transport address in the peer's 897 * address list derived from the INIT or INIT ACK chunk, a 898 * number of data elements needs to be maintained including: 899 */ 900 /* RTO : The current retransmission timeout value. */ 901 unsigned long rto; 902 903 __u32 rtt; /* This is the most recent RTT. */ 904 905 /* RTTVAR : The current RTT variation. */ 906 __u32 rttvar; 907 908 /* SRTT : The current smoothed round trip time. */ 909 __u32 srtt; 910 911 /* RTO-Pending : A flag used to track if one of the DATA 912 * chunks sent to this address is currently being 913 * used to compute a RTT. If this flag is 0, 914 * the next DATA chunk sent to this destination 915 * should be used to compute a RTT and this flag 916 * should be set. Every time the RTT 917 * calculation completes (i.e. the DATA chunk 918 * is SACK'd) clear this flag. 919 * hb_sent : a flag that signals that we have a pending heartbeat. 920 */ 921 __u8 rto_pending; 922 __u8 hb_sent; 923 924 /* Flag to track the current fast recovery state */ 925 __u8 fast_recovery; 926 927 /* 928 * These are the congestion stats. 929 */ 930 /* cwnd : The current congestion window. */ 931 __u32 cwnd; /* This is the actual cwnd. */ 932 933 /* ssthresh : The current slow start threshold value. */ 934 __u32 ssthresh; 935 936 /* partial : The tracking method for increase of cwnd when in 937 * bytes acked : congestion avoidance mode (see Section 6.2.2) 938 */ 939 __u32 partial_bytes_acked; 940 941 /* Data that has been sent, but not acknowledged. */ 942 __u32 flight_size; 943 944 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 945 946 /* TSN marking the fast recovery exit point */ 947 __u32 fast_recovery_exit; 948 949 /* Destination */ 950 struct dst_entry *dst; 951 /* Source address. */ 952 union sctp_addr saddr; 953 954 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 955 * the destination address every heartbeat interval. 956 */ 957 unsigned long hbinterval; 958 959 /* SACK delay timeout */ 960 unsigned long sackdelay; 961 __u32 sackfreq; 962 963 /* When was the last time (in jiffies) that we heard from this 964 * transport? We use this to pick new active and retran paths. 965 */ 966 unsigned long last_time_heard; 967 968 /* Last time(in jiffies) when cwnd is reduced due to the congestion 969 * indication based on ECNE chunk. 970 */ 971 unsigned long last_time_ecne_reduced; 972 973 /* This is the max_retrans value for the transport and will 974 * be initialized from the assocs value. This can be changed 975 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 976 */ 977 __u16 pathmaxrxt; 978 979 /* is the Path MTU update pending on this tranport */ 980 __u8 pmtu_pending; 981 982 /* PMTU : The current known path MTU. */ 983 __u32 pathmtu; 984 985 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 986 __u32 param_flags; 987 988 /* The number of times INIT has been sent on this transport. */ 989 int init_sent_count; 990 991 /* state : The current state of this destination, 992 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 993 */ 994 int state; 995 996 /* These are the error stats for this destination. */ 997 998 /* Error count : The current error count for this destination. */ 999 unsigned short error_count; 1000 1001 /* Per : A timer used by each destination. 1002 * Destination : 1003 * Timer : 1004 * 1005 * [Everywhere else in the text this is called T3-rtx. -ed] 1006 */ 1007 struct timer_list T3_rtx_timer; 1008 1009 /* Heartbeat timer is per destination. */ 1010 struct timer_list hb_timer; 1011 1012 /* Since we're using per-destination retransmission timers 1013 * (see above), we're also using per-destination "transmitted" 1014 * queues. This probably ought to be a private struct 1015 * accessible only within the outqueue, but it's not, yet. 1016 */ 1017 struct list_head transmitted; 1018 1019 /* We build bundle-able packets for this transport here. */ 1020 struct sctp_packet packet; 1021 1022 /* This is the list of transports that have chunks to send. */ 1023 struct list_head send_ready; 1024 1025 int malloced; /* Is this structure kfree()able? */ 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 1060 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1061 gfp_t); 1062 void sctp_transport_set_owner(struct sctp_transport *, 1063 struct sctp_association *); 1064 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1065 struct sctp_sock *); 1066 void sctp_transport_pmtu(struct sctp_transport *); 1067 void sctp_transport_free(struct sctp_transport *); 1068 void sctp_transport_reset_timers(struct sctp_transport *, int); 1069 void sctp_transport_hold(struct sctp_transport *); 1070 void sctp_transport_put(struct sctp_transport *); 1071 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1072 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1073 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1074 void sctp_transport_burst_limited(struct sctp_transport *); 1075 void sctp_transport_burst_reset(struct sctp_transport *); 1076 unsigned long sctp_transport_timeout(struct sctp_transport *); 1077 void sctp_transport_reset(struct sctp_transport *); 1078 void 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 */ 1084 struct 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 1102 void sctp_inq_init(struct sctp_inq *); 1103 void sctp_inq_free(struct sctp_inq *); 1104 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1105 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1106 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1107 void 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 */ 1128 struct 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 1173 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1174 void sctp_outq_teardown(struct sctp_outq *); 1175 void sctp_outq_free(struct sctp_outq*); 1176 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1177 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1178 int sctp_outq_is_empty(const struct sctp_outq *); 1179 void sctp_outq_restart(struct sctp_outq *); 1180 1181 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1182 sctp_retransmit_reason_t); 1183 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1184 int sctp_outq_uncork(struct sctp_outq *); 1185 /* Uncork and flush an outqueue. */ 1186 static 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 */ 1192 struct 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 1212 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1213 void sctp_bind_addr_free(struct sctp_bind_addr *); 1214 int 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); 1218 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1219 const struct sctp_bind_addr *src, 1220 gfp_t gfp); 1221 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1222 __u8 addr_state, gfp_t gfp); 1223 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1224 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1225 struct sctp_sock *); 1226 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1227 struct sctp_sock *, struct sctp_sock *); 1228 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1229 const union sctp_addr *addr); 1230 union 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); 1234 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1235 int *addrs_len, 1236 gfp_t gfp); 1237 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1238 __u16 port, gfp_t gfp); 1239 1240 sctp_scope_t sctp_scope(const union sctp_addr *); 1241 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1242 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1243 int sctp_addr_is_valid(const union sctp_addr *addr); 1244 1245 1246 /* What type of endpoint? */ 1247 typedef 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 1268 struct 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 1319 struct 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. */ 1377 static 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. */ 1386 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1387 void sctp_endpoint_free(struct sctp_endpoint *); 1388 void sctp_endpoint_put(struct sctp_endpoint *); 1389 void sctp_endpoint_hold(struct sctp_endpoint *); 1390 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1391 struct sctp_association *sctp_endpoint_lookup_assoc( 1392 const struct sctp_endpoint *ep, 1393 const union sctp_addr *paddr, 1394 struct sctp_transport **); 1395 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1396 const union sctp_addr *); 1397 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1398 const union sctp_addr *); 1399 int sctp_has_association(const union sctp_addr *laddr, 1400 const union sctp_addr *paddr); 1401 1402 int 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); 1405 int 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 1411 struct 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. */ 1433 struct 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 /* The number of unacknowledged data chunks. Reported through 1723 * the SCTP_STATUS sockopt. 1724 */ 1725 __u16 unack_data; 1726 1727 /* The total number of data chunks that we've had to retransmit 1728 * as the result of a T3 timer expiration 1729 */ 1730 __u32 rtx_data_chunks; 1731 1732 /* This is the association's receive buffer space. This value is used 1733 * to set a_rwnd field in an INIT or a SACK chunk. 1734 */ 1735 __u32 rwnd; 1736 1737 /* This is the last advertised value of rwnd over a SACK chunk. */ 1738 __u32 a_rwnd; 1739 1740 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1741 * to slop over a maximum of the association's frag_point. 1742 */ 1743 __u32 rwnd_over; 1744 1745 /* Keeps treack of rwnd pressure. This happens when we have 1746 * a window, but not recevie buffer (i.e small packets). This one 1747 * is releases slowly (1 PMTU at a time ). 1748 */ 1749 __u32 rwnd_press; 1750 1751 /* This is the sndbuf size in use for the association. 1752 * This corresponds to the sndbuf size for the association, 1753 * as specified in the sk->sndbuf. 1754 */ 1755 int sndbuf_used; 1756 1757 /* This is the amount of memory that this association has allocated 1758 * in the receive path at any given time. 1759 */ 1760 atomic_t rmem_alloc; 1761 1762 /* This is the wait queue head for send requests waiting on 1763 * the association sndbuf space. 1764 */ 1765 wait_queue_head_t wait; 1766 1767 /* The message size at which SCTP fragmentation will occur. */ 1768 __u32 frag_point; 1769 __u32 user_frag; 1770 1771 /* Counter used to count INIT errors. */ 1772 int init_err_counter; 1773 1774 /* Count the number of INIT cycles (for doubling timeout). */ 1775 int init_cycle; 1776 1777 /* Default send parameters. */ 1778 __u16 default_stream; 1779 __u16 default_flags; 1780 __u32 default_ppid; 1781 __u32 default_context; 1782 __u32 default_timetolive; 1783 1784 /* Default receive parameters */ 1785 __u32 default_rcv_context; 1786 1787 /* This tracks outbound ssn for a given stream. */ 1788 struct sctp_ssnmap *ssnmap; 1789 1790 /* All outbound chunks go through this structure. */ 1791 struct sctp_outq outqueue; 1792 1793 /* A smart pipe that will handle reordering and fragmentation, 1794 * as well as handle passing events up to the ULP. 1795 */ 1796 struct sctp_ulpq ulpq; 1797 1798 /* Last TSN that caused an ECNE Chunk to be sent. */ 1799 __u32 last_ecne_tsn; 1800 1801 /* Last TSN that caused a CWR Chunk to be sent. */ 1802 __u32 last_cwr_tsn; 1803 1804 /* How many duplicated TSNs have we seen? */ 1805 int numduptsns; 1806 1807 /* Number of seconds of idle time before an association is closed. 1808 * In the association context, this is really used as a boolean 1809 * since the real timeout is stored in the timeouts array 1810 */ 1811 __u32 autoclose; 1812 1813 /* These are to support 1814 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1815 * and Enforcement of Flow and Message Limits" 1816 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1817 * or "ADDIP" for short. 1818 */ 1819 1820 1821 1822 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1823 * 1824 * R1) One and only one ASCONF Chunk MAY be in transit and 1825 * unacknowledged at any one time. If a sender, after sending 1826 * an ASCONF chunk, decides it needs to transfer another 1827 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1828 * returns from the previous ASCONF Chunk before sending a 1829 * subsequent ASCONF. Note this restriction binds each side, 1830 * so at any time two ASCONF may be in-transit on any given 1831 * association (one sent from each endpoint). 1832 * 1833 * [This is our one-and-only-one ASCONF in flight. If we do 1834 * not have an ASCONF in flight, this is NULL.] 1835 */ 1836 struct sctp_chunk *addip_last_asconf; 1837 1838 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1839 * 1840 * This is needed to implement itmes E1 - E4 of the updated 1841 * spec. Here is the justification: 1842 * 1843 * Since the peer may bundle multiple ASCONF chunks toward us, 1844 * we now need the ability to cache multiple ACKs. The section 1845 * describes in detail how they are cached and cleaned up. 1846 */ 1847 struct list_head asconf_ack_list; 1848 1849 /* These ASCONF chunks are waiting to be sent. 1850 * 1851 * These chunaks can't be pushed to outqueue until receiving 1852 * ASCONF_ACK for the previous ASCONF indicated by 1853 * addip_last_asconf, so as to guarantee that only one ASCONF 1854 * is in flight at any time. 1855 * 1856 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1857 * 1858 * In defining the ASCONF Chunk transfer procedures, it is 1859 * essential that these transfers MUST NOT cause congestion 1860 * within the network. To achieve this, we place these 1861 * restrictions on the transfer of ASCONF Chunks: 1862 * 1863 * R1) One and only one ASCONF Chunk MAY be in transit and 1864 * unacknowledged at any one time. If a sender, after sending 1865 * an ASCONF chunk, decides it needs to transfer another 1866 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1867 * returns from the previous ASCONF Chunk before sending a 1868 * subsequent ASCONF. Note this restriction binds each side, 1869 * so at any time two ASCONF may be in-transit on any given 1870 * association (one sent from each endpoint). 1871 * 1872 * 1873 * [I really think this is EXACTLY the sort of intelligence 1874 * which already resides in sctp_outq. Please move this 1875 * queue and its supporting logic down there. --piggy] 1876 */ 1877 struct list_head addip_chunk_list; 1878 1879 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1880 * 1881 * A2) A serial number should be assigned to the Chunk. The 1882 * serial number SHOULD be a monotonically increasing 1883 * number. The serial number SHOULD be initialized at 1884 * the start of the association to the same value as the 1885 * Initial TSN and every time a new ASCONF chunk is created 1886 * it is incremented by one after assigning the serial number 1887 * to the newly created chunk. 1888 * 1889 * ADDIP 1890 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1891 * 1892 * Serial Number : 32 bits (unsigned integer) 1893 * 1894 * This value represents a Serial Number for the ASCONF 1895 * Chunk. The valid range of Serial Number is from 0 to 1896 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1897 * after reaching 4294967295. 1898 */ 1899 __u32 addip_serial; 1900 1901 /* SCTP AUTH: list of the endpoint shared keys. These 1902 * keys are provided out of band by the user applicaton 1903 * and can't change during the lifetime of the association 1904 */ 1905 struct list_head endpoint_shared_keys; 1906 1907 /* SCTP AUTH: 1908 * The current generated assocaition shared key (secret) 1909 */ 1910 struct sctp_auth_bytes *asoc_shared_key; 1911 1912 /* SCTP AUTH: hmac id of the first peer requested algorithm 1913 * that we support. 1914 */ 1915 __u16 default_hmac_id; 1916 1917 __u16 active_key_id; 1918 1919 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1920 temp:1; /* Is it a temporary association? */ 1921 }; 1922 1923 1924 /* An eyecatcher for determining if we are really looking at an 1925 * association data structure. 1926 */ 1927 enum { 1928 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1929 }; 1930 1931 /* Recover the outter association structure. */ 1932 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1933 { 1934 struct sctp_association *asoc; 1935 1936 asoc = container_of(base, struct sctp_association, base); 1937 return asoc; 1938 } 1939 1940 /* These are function signatures for manipulating associations. */ 1941 1942 1943 struct sctp_association * 1944 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1945 sctp_scope_t scope, gfp_t gfp); 1946 void sctp_association_free(struct sctp_association *); 1947 void sctp_association_put(struct sctp_association *); 1948 void sctp_association_hold(struct sctp_association *); 1949 1950 struct sctp_transport *sctp_assoc_choose_alter_transport( 1951 struct sctp_association *, struct sctp_transport *); 1952 void sctp_assoc_update_retran_path(struct sctp_association *); 1953 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1954 const union sctp_addr *); 1955 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1956 const union sctp_addr *laddr); 1957 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1958 const union sctp_addr *address, 1959 const gfp_t gfp, 1960 const int peer_state); 1961 void sctp_assoc_del_peer(struct sctp_association *asoc, 1962 const union sctp_addr *addr); 1963 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1964 struct sctp_transport *peer); 1965 void sctp_assoc_control_transport(struct sctp_association *, 1966 struct sctp_transport *, 1967 sctp_transport_cmd_t, sctp_sn_error_t); 1968 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1969 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1970 const union sctp_addr *, 1971 const union sctp_addr *); 1972 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1973 void sctp_assoc_update(struct sctp_association *old, 1974 struct sctp_association *new); 1975 1976 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1977 1978 void sctp_assoc_sync_pmtu(struct sctp_association *); 1979 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1980 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1981 void sctp_assoc_set_primary(struct sctp_association *, 1982 struct sctp_transport *); 1983 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1984 struct sctp_transport *); 1985 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1986 sctp_scope_t, gfp_t); 1987 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1988 struct sctp_cookie*, 1989 gfp_t gfp); 1990 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1991 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1992 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1993 const struct sctp_association *asoc, 1994 __be32 serial); 1995 1996 1997 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1998 const union sctp_addr *ss2); 1999 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2000 2001 /* A convenience structure to parse out SCTP specific CMSGs. */ 2002 typedef struct sctp_cmsgs { 2003 struct sctp_initmsg *init; 2004 struct sctp_sndrcvinfo *info; 2005 } sctp_cmsgs_t; 2006 2007 /* Structure for tracking memory objects */ 2008 typedef struct { 2009 char *label; 2010 atomic_t *counter; 2011 } sctp_dbg_objcnt_entry_t; 2012 2013 #endif /* __sctp_structs_h__ */ 2014