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