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 } sctp_globals; 222 223 #define sctp_rto_initial (sctp_globals.rto_initial) 224 #define sctp_rto_min (sctp_globals.rto_min) 225 #define sctp_rto_max (sctp_globals.rto_max) 226 #define sctp_rto_alpha (sctp_globals.rto_alpha) 227 #define sctp_rto_beta (sctp_globals.rto_beta) 228 #define sctp_max_burst (sctp_globals.max_burst) 229 #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) 230 #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) 231 #define sctp_max_retrans_association (sctp_globals.max_retrans_association) 232 #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) 233 #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) 234 #define sctp_max_retrans_path (sctp_globals.max_retrans_path) 235 #define sctp_max_retrans_init (sctp_globals.max_retrans_init) 236 #define sctp_sack_timeout (sctp_globals.sack_timeout) 237 #define sctp_hb_interval (sctp_globals.hb_interval) 238 #define sctp_max_instreams (sctp_globals.max_instreams) 239 #define sctp_max_outstreams (sctp_globals.max_outstreams) 240 #define sctp_address_families (sctp_globals.address_families) 241 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 242 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 243 #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) 244 #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) 245 #define sctp_port_hashsize (sctp_globals.port_hashsize) 246 #define sctp_port_rover (sctp_globals.port_rover) 247 #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) 248 #define sctp_port_hashtable (sctp_globals.port_hashtable) 249 #define sctp_local_addr_list (sctp_globals.local_addr_list) 250 #define sctp_local_addr_lock (sctp_globals.addr_list_lock) 251 #define sctp_addip_enable (sctp_globals.addip_enable) 252 #define sctp_addip_noauth (sctp_globals.addip_noauth_enable) 253 #define sctp_prsctp_enable (sctp_globals.prsctp_enable) 254 #define sctp_auth_enable (sctp_globals.auth_enable) 255 256 /* SCTP Socket type: UDP or TCP style. */ 257 typedef enum { 258 SCTP_SOCKET_UDP = 0, 259 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 260 SCTP_SOCKET_TCP 261 } sctp_socket_type_t; 262 263 /* Per socket SCTP information. */ 264 struct sctp_sock { 265 /* inet_sock has to be the first member of sctp_sock */ 266 struct inet_sock inet; 267 /* What kind of a socket is this? */ 268 sctp_socket_type_t type; 269 270 /* PF_ family specific functions. */ 271 struct sctp_pf *pf; 272 273 /* Access to HMAC transform. */ 274 struct crypto_hash *hmac; 275 276 /* What is our base endpointer? */ 277 struct sctp_endpoint *ep; 278 279 struct sctp_bind_bucket *bind_hash; 280 /* Various Socket Options. */ 281 __u16 default_stream; 282 __u32 default_ppid; 283 __u16 default_flags; 284 __u32 default_context; 285 __u32 default_timetolive; 286 __u32 default_rcv_context; 287 int max_burst; 288 289 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 290 * the destination address every heartbeat interval. This value 291 * will be inherited by all new associations. 292 */ 293 __u32 hbinterval; 294 295 /* This is the max_retrans value for new associations. */ 296 __u16 pathmaxrxt; 297 298 /* The initial Path MTU to use for new associations. */ 299 __u32 pathmtu; 300 301 /* The default SACK delay timeout for new associations. */ 302 __u32 sackdelay; 303 304 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 305 __u32 param_flags; 306 307 struct sctp_initmsg initmsg; 308 struct sctp_rtoinfo rtoinfo; 309 struct sctp_paddrparams paddrparam; 310 struct sctp_event_subscribe subscribe; 311 struct sctp_assocparams assocparams; 312 int user_frag; 313 __u32 autoclose; 314 __u8 nodelay; 315 __u8 disable_fragments; 316 __u8 v4mapped; 317 __u8 frag_interleave; 318 __u32 adaptation_ind; 319 __u32 pd_point; 320 321 atomic_t pd_mode; 322 /* Receive to here while partial delivery is in effect. */ 323 struct sk_buff_head pd_lobby; 324 }; 325 326 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 327 { 328 return (struct sctp_sock *)sk; 329 } 330 331 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 332 { 333 return (struct sock *)sp; 334 } 335 336 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 337 struct sctp6_sock { 338 struct sctp_sock sctp; 339 struct ipv6_pinfo inet6; 340 }; 341 #endif /* CONFIG_IPV6 */ 342 343 344 /* This is our APPLICATION-SPECIFIC state cookie. 345 * THIS IS NOT DICTATED BY THE SPECIFICATION. 346 */ 347 /* These are the parts of an association which we send in the cookie. 348 * Most of these are straight out of: 349 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 350 * 351 */ 352 353 struct sctp_cookie { 354 355 /* My : Tag expected in every inbound packet and sent 356 * Verification: in the INIT or INIT ACK chunk. 357 * Tag : 358 */ 359 __u32 my_vtag; 360 361 /* Peer's : Tag expected in every outbound packet except 362 * Verification: in the INIT chunk. 363 * Tag : 364 */ 365 __u32 peer_vtag; 366 367 /* The rest of these are not from the spec, but really need to 368 * be in the cookie. 369 */ 370 371 /* My Tie Tag : Assist in discovering a restarting association. */ 372 __u32 my_ttag; 373 374 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 375 __u32 peer_ttag; 376 377 /* When does this cookie expire? */ 378 struct timeval expiration; 379 380 /* Number of inbound/outbound streams which are set 381 * and negotiated during the INIT process. 382 */ 383 __u16 sinit_num_ostreams; 384 __u16 sinit_max_instreams; 385 386 /* This is the first sequence number I used. */ 387 __u32 initial_tsn; 388 389 /* This holds the originating address of the INIT packet. */ 390 union sctp_addr peer_addr; 391 392 /* IG Section 2.35.3 393 * Include the source port of the INIT-ACK 394 */ 395 __u16 my_port; 396 397 __u8 prsctp_capable; 398 399 /* Padding for future use */ 400 __u8 padding; 401 402 __u32 adaptation_ind; 403 404 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 405 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 406 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 407 408 /* This is a shim for my peer's INIT packet, followed by 409 * a copy of the raw address list of the association. 410 * The length of the raw address list is saved in the 411 * raw_addr_list_len field, which will be used at the time when 412 * the association TCB is re-constructed from the cookie. 413 */ 414 __u32 raw_addr_list_len; 415 struct sctp_init_chunk peer_init[0]; 416 }; 417 418 419 /* The format of our cookie that we send to our peer. */ 420 struct sctp_signed_cookie { 421 __u8 signature[SCTP_SECRET_SIZE]; 422 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 423 struct sctp_cookie c; 424 } __attribute__((packed)); 425 426 /* This is another convenience type to allocate memory for address 427 * params for the maximum size and pass such structures around 428 * internally. 429 */ 430 union sctp_addr_param { 431 struct sctp_paramhdr p; 432 struct sctp_ipv4addr_param v4; 433 struct sctp_ipv6addr_param v6; 434 }; 435 436 /* A convenience type to allow walking through the various 437 * parameters and avoid casting all over the place. 438 */ 439 union sctp_params { 440 void *v; 441 struct sctp_paramhdr *p; 442 struct sctp_cookie_preserve_param *life; 443 struct sctp_hostname_param *dns; 444 struct sctp_cookie_param *cookie; 445 struct sctp_supported_addrs_param *sat; 446 struct sctp_ipv4addr_param *v4; 447 struct sctp_ipv6addr_param *v6; 448 union sctp_addr_param *addr; 449 struct sctp_adaptation_ind_param *aind; 450 struct sctp_supported_ext_param *ext; 451 struct sctp_random_param *random; 452 struct sctp_chunks_param *chunks; 453 struct sctp_hmac_algo_param *hmac_algo; 454 struct sctp_addip_param *addip; 455 }; 456 457 /* RFC 2960. Section 3.3.5 Heartbeat. 458 * Heartbeat Information: variable length 459 * The Sender-specific Heartbeat Info field should normally include 460 * information about the sender's current time when this HEARTBEAT 461 * chunk is sent and the destination transport address to which this 462 * HEARTBEAT is sent (see Section 8.3). 463 */ 464 typedef struct sctp_sender_hb_info { 465 struct sctp_paramhdr param_hdr; 466 union sctp_addr daddr; 467 unsigned long sent_at; 468 __u64 hb_nonce; 469 } __attribute__((packed)) sctp_sender_hb_info_t; 470 471 /* 472 * RFC 2960 1.3.2 Sequenced Delivery within Streams 473 * 474 * The term "stream" is used in SCTP to refer to a sequence of user 475 * messages that are to be delivered to the upper-layer protocol in 476 * order with respect to other messages within the same stream. This is 477 * in contrast to its usage in TCP, where it refers to a sequence of 478 * bytes (in this document a byte is assumed to be eight bits). 479 * ... 480 * 481 * This is the structure we use to track both our outbound and inbound 482 * SSN, or Stream Sequence Numbers. 483 */ 484 485 struct sctp_stream { 486 __u16 *ssn; 487 unsigned int len; 488 }; 489 490 struct sctp_ssnmap { 491 struct sctp_stream in; 492 struct sctp_stream out; 493 int malloced; 494 }; 495 496 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 497 gfp_t gfp); 498 void sctp_ssnmap_free(struct sctp_ssnmap *map); 499 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 500 501 /* What is the current SSN number for this stream? */ 502 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 503 { 504 return stream->ssn[id]; 505 } 506 507 /* Return the next SSN number for this stream. */ 508 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 509 { 510 return stream->ssn[id]++; 511 } 512 513 /* Skip over this ssn and all below. */ 514 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 515 __u16 ssn) 516 { 517 stream->ssn[id] = ssn+1; 518 } 519 520 /* 521 * Pointers to address related SCTP functions. 522 * (i.e. things that depend on the address family.) 523 */ 524 struct sctp_af { 525 int (*sctp_xmit) (struct sk_buff *skb, 526 struct sctp_transport *, 527 int ipfragok); 528 int (*setsockopt) (struct sock *sk, 529 int level, 530 int optname, 531 char __user *optval, 532 int optlen); 533 int (*getsockopt) (struct sock *sk, 534 int level, 535 int optname, 536 char __user *optval, 537 int __user *optlen); 538 int (*compat_setsockopt) (struct sock *sk, 539 int level, 540 int optname, 541 char __user *optval, 542 int optlen); 543 int (*compat_getsockopt) (struct sock *sk, 544 int level, 545 int optname, 546 char __user *optval, 547 int __user *optlen); 548 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 549 union sctp_addr *daddr, 550 union sctp_addr *saddr); 551 void (*get_saddr) (struct sctp_sock *sk, 552 struct sctp_association *asoc, 553 struct dst_entry *dst, 554 union sctp_addr *daddr, 555 union sctp_addr *saddr); 556 void (*copy_addrlist) (struct list_head *, 557 struct net_device *); 558 void (*dst_saddr) (union sctp_addr *saddr, 559 struct dst_entry *dst, 560 __be16 port); 561 int (*cmp_addr) (const union sctp_addr *addr1, 562 const union sctp_addr *addr2); 563 void (*addr_copy) (union sctp_addr *dst, 564 union sctp_addr *src); 565 void (*from_skb) (union sctp_addr *, 566 struct sk_buff *skb, 567 int saddr); 568 void (*from_sk) (union sctp_addr *, 569 struct sock *sk); 570 void (*to_sk_saddr) (union sctp_addr *, 571 struct sock *sk); 572 void (*to_sk_daddr) (union sctp_addr *, 573 struct sock *sk); 574 void (*from_addr_param) (union sctp_addr *, 575 union sctp_addr_param *, 576 __be16 port, int iif); 577 int (*to_addr_param) (const union sctp_addr *, 578 union sctp_addr_param *); 579 int (*addr_valid) (union sctp_addr *, 580 struct sctp_sock *, 581 const struct sk_buff *); 582 sctp_scope_t (*scope) (union sctp_addr *); 583 void (*inaddr_any) (union sctp_addr *, __be16); 584 int (*is_any) (const union sctp_addr *); 585 int (*available) (union sctp_addr *, 586 struct sctp_sock *); 587 int (*skb_iif) (const struct sk_buff *sk); 588 int (*is_ce) (const struct sk_buff *sk); 589 void (*seq_dump_addr)(struct seq_file *seq, 590 union sctp_addr *addr); 591 void (*ecn_capable)(struct sock *sk); 592 __u16 net_header_len; 593 int sockaddr_len; 594 sa_family_t sa_family; 595 struct list_head list; 596 }; 597 598 struct sctp_af *sctp_get_af_specific(sa_family_t); 599 int sctp_register_af(struct sctp_af *); 600 601 /* Protocol family functions. */ 602 struct sctp_pf { 603 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 604 void (*skb_msgname) (struct sk_buff *, char *, int *); 605 int (*af_supported) (sa_family_t, struct sctp_sock *); 606 int (*cmp_addr) (const union sctp_addr *, 607 const union sctp_addr *, 608 struct sctp_sock *); 609 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 610 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 611 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 612 struct sock *(*create_accept_sk) (struct sock *sk, 613 struct sctp_association *asoc); 614 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 615 struct sctp_af *af; 616 }; 617 618 619 /* Structure to track chunk fragments that have been acked, but peer 620 * fragments of the same message have not. 621 */ 622 struct sctp_datamsg { 623 /* Chunks waiting to be submitted to lower layer. */ 624 struct list_head chunks; 625 /* Chunks that have been transmitted. */ 626 struct list_head track; 627 /* Reference counting. */ 628 atomic_t refcnt; 629 /* When is this message no longer interesting to the peer? */ 630 unsigned long expires_at; 631 /* Did the messenge fail to send? */ 632 int send_error; 633 char send_failed; 634 /* Control whether chunks from this message can be abandoned. */ 635 char can_abandon; 636 }; 637 638 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 639 struct sctp_sndrcvinfo *, 640 struct msghdr *, int len); 641 void sctp_datamsg_put(struct sctp_datamsg *); 642 void sctp_chunk_fail(struct sctp_chunk *, int error); 643 int sctp_chunk_abandoned(struct sctp_chunk *); 644 645 /* RFC2960 1.4 Key Terms 646 * 647 * o Chunk: A unit of information within an SCTP packet, consisting of 648 * a chunk header and chunk-specific content. 649 * 650 * As a matter of convenience, we remember the SCTP common header for 651 * each chunk as well as a few other header pointers... 652 */ 653 struct sctp_chunk { 654 struct list_head list; 655 656 atomic_t refcnt; 657 658 /* This is our link to the per-transport transmitted list. */ 659 struct list_head transmitted_list; 660 661 /* This field is used by chunks that hold fragmented data. 662 * For the first fragment this is the list that holds the rest of 663 * fragments. For the remaining fragments, this is the link to the 664 * frag_list maintained in the first fragment. 665 */ 666 struct list_head frag_list; 667 668 /* This points to the sk_buff containing the actual data. */ 669 struct sk_buff *skb; 670 671 /* These are the SCTP headers by reverse order in a packet. 672 * Note that some of these may happen more than once. In that 673 * case, we point at the "current" one, whatever that means 674 * for that level of header. 675 */ 676 677 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 678 union sctp_params param_hdr; 679 union { 680 __u8 *v; 681 struct sctp_datahdr *data_hdr; 682 struct sctp_inithdr *init_hdr; 683 struct sctp_sackhdr *sack_hdr; 684 struct sctp_heartbeathdr *hb_hdr; 685 struct sctp_sender_hb_info *hbs_hdr; 686 struct sctp_shutdownhdr *shutdown_hdr; 687 struct sctp_signed_cookie *cookie_hdr; 688 struct sctp_ecnehdr *ecne_hdr; 689 struct sctp_cwrhdr *ecn_cwr_hdr; 690 struct sctp_errhdr *err_hdr; 691 struct sctp_addiphdr *addip_hdr; 692 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 693 struct sctp_authhdr *auth_hdr; 694 } subh; 695 696 __u8 *chunk_end; 697 698 struct sctp_chunkhdr *chunk_hdr; 699 struct sctphdr *sctp_hdr; 700 701 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 702 struct sctp_sndrcvinfo sinfo; 703 704 /* Which association does this belong to? */ 705 struct sctp_association *asoc; 706 707 /* What endpoint received this chunk? */ 708 struct sctp_ep_common *rcvr; 709 710 /* We fill this in if we are calculating RTT. */ 711 unsigned long sent_at; 712 713 /* What is the origin IP address for this chunk? */ 714 union sctp_addr source; 715 /* Destination address for this chunk. */ 716 union sctp_addr dest; 717 718 /* For outbound message, track all fragments for SEND_FAILED. */ 719 struct sctp_datamsg *msg; 720 721 /* For an inbound chunk, this tells us where it came from. 722 * For an outbound chunk, it tells us where we'd like it to 723 * go. It is NULL if we have no preference. 724 */ 725 struct sctp_transport *transport; 726 727 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 728 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 729 * spec violates the principle premis that all chunks are processed 730 * in order. 731 */ 732 struct sk_buff *auth_chunk; 733 734 __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ 735 __u8 resent; /* Has this chunk ever been retransmitted. */ 736 __u8 has_tsn; /* Does this chunk have a TSN yet? */ 737 __u8 has_ssn; /* Does this chunk have a SSN yet? */ 738 __u8 singleton; /* Was this the only chunk in the packet? */ 739 __u8 end_of_packet; /* Was this the last chunk in the packet? */ 740 __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ 741 __u8 pdiscard; /* Discard the whole packet now? */ 742 __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ 743 __s8 fast_retransmit; /* Is this chunk fast retransmitted? */ 744 __u8 tsn_missing_report; /* Data chunk missing counter. */ 745 __u8 data_accepted; /* At least 1 chunk in this packet accepted */ 746 __u8 auth; /* IN: was auth'ed | OUT: needs auth */ 747 __u8 has_asconf; /* IN: have seen an asconf before */ 748 }; 749 750 void sctp_chunk_hold(struct sctp_chunk *); 751 void sctp_chunk_put(struct sctp_chunk *); 752 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 753 struct iovec *data); 754 void sctp_chunk_free(struct sctp_chunk *); 755 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 756 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 757 const struct sctp_association *, 758 struct sock *); 759 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 760 union sctp_addr *); 761 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 762 763 enum { 764 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 765 SCTP_ADDR_SRC, /* address can be used as source */ 766 SCTP_ADDR_DEL, /* address about to be deleted */ 767 }; 768 769 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 770 struct sctp_sockaddr_entry { 771 struct list_head list; 772 struct rcu_head rcu; 773 union sctp_addr a; 774 __u8 state; 775 __u8 valid; 776 }; 777 778 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 779 780 /* This structure holds lists of chunks as we are assembling for 781 * transmission. 782 */ 783 struct sctp_packet { 784 /* These are the SCTP header values (host order) for the packet. */ 785 __u16 source_port; 786 __u16 destination_port; 787 __u32 vtag; 788 789 /* This contains the payload chunks. */ 790 struct list_head chunk_list; 791 792 /* This is the overhead of the sctp and ip headers. */ 793 size_t overhead; 794 /* This is the total size of all chunks INCLUDING padding. */ 795 size_t size; 796 797 /* The packet is destined for this transport address. 798 * The function we finally use to pass down to the next lower 799 * layer lives in the transport structure. 800 */ 801 struct sctp_transport *transport; 802 803 /* pointer to the auth chunk for this packet */ 804 struct sctp_chunk *auth; 805 806 /* This packet contains a COOKIE-ECHO chunk. */ 807 __u8 has_cookie_echo; 808 809 /* This packet contains a SACK chunk. */ 810 __u8 has_sack; 811 812 /* This packet contains an AUTH chunk */ 813 __u8 has_auth; 814 815 /* This packet contains at least 1 DATA chunk */ 816 __u8 has_data; 817 818 /* SCTP cannot fragment this packet. So let ip fragment it. */ 819 __u8 ipfragok; 820 821 __u8 malloced; 822 }; 823 824 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 825 struct sctp_transport *, 826 __u16 sport, __u16 dport); 827 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 828 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 829 struct sctp_chunk *); 830 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 831 struct sctp_chunk *); 832 int sctp_packet_transmit(struct sctp_packet *); 833 void sctp_packet_free(struct sctp_packet *); 834 835 static inline int sctp_packet_empty(struct sctp_packet *packet) 836 { 837 return (packet->size == packet->overhead); 838 } 839 840 /* This represents a remote transport address. 841 * For local transport addresses, we just use union sctp_addr. 842 * 843 * RFC2960 Section 1.4 Key Terms 844 * 845 * o Transport address: A Transport Address is traditionally defined 846 * by Network Layer address, Transport Layer protocol and Transport 847 * Layer port number. In the case of SCTP running over IP, a 848 * transport address is defined by the combination of an IP address 849 * and an SCTP port number (where SCTP is the Transport protocol). 850 * 851 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 852 * 853 * o The sender keeps a separate congestion control parameter set for 854 * each of the destination addresses it can send to (not each 855 * source-destination pair but for each destination). The parameters 856 * should decay if the address is not used for a long enough time 857 * period. 858 * 859 */ 860 struct sctp_transport { 861 /* A list of transports. */ 862 struct list_head transports; 863 864 /* Reference counting. */ 865 atomic_t refcnt; 866 int dead; 867 868 /* This is the peer's IP address and port. */ 869 union sctp_addr ipaddr; 870 871 /* These are the functions we call to handle LLP stuff. */ 872 struct sctp_af *af_specific; 873 874 /* Which association do we belong to? */ 875 struct sctp_association *asoc; 876 877 /* RFC2960 878 * 879 * 12.3 Per Transport Address Data 880 * 881 * For each destination transport address in the peer's 882 * address list derived from the INIT or INIT ACK chunk, a 883 * number of data elements needs to be maintained including: 884 */ 885 /* RTO : The current retransmission timeout value. */ 886 unsigned long rto; 887 unsigned long last_rto; 888 889 __u32 rtt; /* This is the most recent RTT. */ 890 891 /* RTTVAR : The current RTT variation. */ 892 __u32 rttvar; 893 894 /* SRTT : The current smoothed round trip time. */ 895 __u32 srtt; 896 897 /* RTO-Pending : A flag used to track if one of the DATA 898 * chunks sent to this address is currently being 899 * used to compute a RTT. If this flag is 0, 900 * the next DATA chunk sent to this destination 901 * should be used to compute a RTT and this flag 902 * should be set. Every time the RTT 903 * calculation completes (i.e. the DATA chunk 904 * is SACK'd) clear this flag. 905 */ 906 __u8 rto_pending; 907 908 /* Flag to track the current fast recovery state */ 909 __u8 fast_recovery; 910 911 /* 912 * These are the congestion stats. 913 */ 914 /* cwnd : The current congestion window. */ 915 __u32 cwnd; /* This is the actual cwnd. */ 916 917 /* ssthresh : The current slow start threshold value. */ 918 __u32 ssthresh; 919 920 /* partial : The tracking method for increase of cwnd when in 921 * bytes acked : congestion avoidance mode (see Section 6.2.2) 922 */ 923 __u32 partial_bytes_acked; 924 925 /* Data that has been sent, but not acknowledged. */ 926 __u32 flight_size; 927 928 /* TSN marking the fast recovery exit point */ 929 __u32 fast_recovery_exit; 930 931 /* Destination */ 932 struct dst_entry *dst; 933 /* Source address. */ 934 union sctp_addr saddr; 935 936 /* When was the last time(in jiffies) that a data packet was sent on 937 * this transport? This is used to adjust the cwnd when the transport 938 * becomes inactive. 939 */ 940 unsigned long last_time_used; 941 942 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 943 * the destination address every heartbeat interval. 944 */ 945 unsigned long hbinterval; 946 947 /* SACK delay timeout */ 948 unsigned long sackdelay; 949 950 /* When was the last time (in jiffies) that we heard from this 951 * transport? We use this to pick new active and retran paths. 952 */ 953 unsigned long last_time_heard; 954 955 /* Last time(in jiffies) when cwnd is reduced due to the congestion 956 * indication based on ECNE chunk. 957 */ 958 unsigned long last_time_ecne_reduced; 959 960 /* This is the max_retrans value for the transport and will 961 * be initialized from the assocs value. This can be changed 962 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 963 */ 964 __u16 pathmaxrxt; 965 966 /* is the Path MTU update pending on this tranport */ 967 __u8 pmtu_pending; 968 969 /* PMTU : The current known path MTU. */ 970 __u32 pathmtu; 971 972 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 973 __u32 param_flags; 974 975 /* The number of times INIT has been sent on this transport. */ 976 int init_sent_count; 977 978 /* state : The current state of this destination, 979 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. 980 */ 981 int state; 982 983 /* These are the error stats for this destination. */ 984 985 /* Error count : The current error count for this destination. */ 986 unsigned short error_count; 987 988 /* Per : A timer used by each destination. 989 * Destination : 990 * Timer : 991 * 992 * [Everywhere else in the text this is called T3-rtx. -ed] 993 */ 994 struct timer_list T3_rtx_timer; 995 996 /* Heartbeat timer is per destination. */ 997 struct timer_list hb_timer; 998 999 /* Since we're using per-destination retransmission timers 1000 * (see above), we're also using per-destination "transmitted" 1001 * queues. This probably ought to be a private struct 1002 * accessible only within the outqueue, but it's not, yet. 1003 */ 1004 struct list_head transmitted; 1005 1006 /* We build bundle-able packets for this transport here. */ 1007 struct sctp_packet packet; 1008 1009 /* This is the list of transports that have chunks to send. */ 1010 struct list_head send_ready; 1011 1012 int malloced; /* Is this structure kfree()able? */ 1013 1014 /* State information saved for SFR_CACC algorithm. The key 1015 * idea in SFR_CACC is to maintain state at the sender on a 1016 * per-destination basis when a changeover happens. 1017 * char changeover_active; 1018 * char cycling_changeover; 1019 * __u32 next_tsn_at_change; 1020 * char cacc_saw_newack; 1021 */ 1022 struct { 1023 /* An unsigned integer, which stores the next TSN to be 1024 * used by the sender, at the moment of changeover. 1025 */ 1026 __u32 next_tsn_at_change; 1027 1028 /* A flag which indicates the occurrence of a changeover */ 1029 char changeover_active; 1030 1031 /* A flag which indicates whether the change of primary is 1032 * the first switch to this destination address during an 1033 * active switch. 1034 */ 1035 char cycling_changeover; 1036 1037 /* A temporary flag, which is used during the processing of 1038 * a SACK to estimate the causative TSN(s)'s group. 1039 */ 1040 char cacc_saw_newack; 1041 } cacc; 1042 1043 /* 64-bit random number sent with heartbeat. */ 1044 __u64 hb_nonce; 1045 }; 1046 1047 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1048 gfp_t); 1049 void sctp_transport_set_owner(struct sctp_transport *, 1050 struct sctp_association *); 1051 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1052 struct sctp_sock *); 1053 void sctp_transport_pmtu(struct sctp_transport *); 1054 void sctp_transport_free(struct sctp_transport *); 1055 void sctp_transport_reset_timers(struct sctp_transport *, int); 1056 void sctp_transport_hold(struct sctp_transport *); 1057 void sctp_transport_put(struct sctp_transport *); 1058 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1059 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1060 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1061 unsigned long sctp_transport_timeout(struct sctp_transport *); 1062 void sctp_transport_reset(struct sctp_transport *); 1063 void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1064 1065 1066 /* This is the structure we use to queue packets as they come into 1067 * SCTP. We write packets to it and read chunks from it. 1068 */ 1069 struct sctp_inq { 1070 /* This is actually a queue of sctp_chunk each 1071 * containing a partially decoded packet. 1072 */ 1073 struct list_head in_chunk_list; 1074 /* This is the packet which is currently off the in queue and is 1075 * being worked on through the inbound chunk processing. 1076 */ 1077 struct sctp_chunk *in_progress; 1078 1079 /* This is the delayed task to finish delivering inbound 1080 * messages. 1081 */ 1082 struct work_struct immediate; 1083 1084 int malloced; /* Is this structure kfree()able? */ 1085 }; 1086 1087 void sctp_inq_init(struct sctp_inq *); 1088 void sctp_inq_free(struct sctp_inq *); 1089 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1090 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1091 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1092 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1093 1094 /* This is the structure we use to hold outbound chunks. You push 1095 * chunks in and they automatically pop out the other end as bundled 1096 * packets (it calls (*output_handler)()). 1097 * 1098 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1099 * and 8.2 of the v13 draft. 1100 * 1101 * It handles retransmissions. The connection to the timeout portion 1102 * of the state machine is through sctp_..._timeout() and timeout_handler. 1103 * 1104 * If you feed it SACKs, it will eat them. 1105 * 1106 * If you give it big chunks, it will fragment them. 1107 * 1108 * It assigns TSN's to data chunks. This happens at the last possible 1109 * instant before transmission. 1110 * 1111 * When free()'d, it empties itself out via output_handler(). 1112 */ 1113 struct sctp_outq { 1114 struct sctp_association *asoc; 1115 1116 /* Data pending that has never been transmitted. */ 1117 struct list_head out_chunk_list; 1118 1119 unsigned out_qlen; /* Total length of queued data chunks. */ 1120 1121 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1122 unsigned error; 1123 1124 /* These are control chunks we want to send. */ 1125 struct list_head control_chunk_list; 1126 1127 /* These are chunks that have been sacked but are above the 1128 * CTSN, or cumulative tsn ack point. 1129 */ 1130 struct list_head sacked; 1131 1132 /* Put chunks on this list to schedule them for 1133 * retransmission. 1134 */ 1135 struct list_head retransmit; 1136 1137 /* Put chunks on this list to save them for FWD TSN processing as 1138 * they were abandoned. 1139 */ 1140 struct list_head abandoned; 1141 1142 /* How many unackd bytes do we have in-flight? */ 1143 __u32 outstanding_bytes; 1144 1145 /* Are we doing fast-rtx on this queue */ 1146 char fast_rtx; 1147 1148 /* Corked? */ 1149 char cork; 1150 1151 /* Is this structure empty? */ 1152 char empty; 1153 1154 /* Are we kfree()able? */ 1155 char malloced; 1156 }; 1157 1158 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1159 void sctp_outq_teardown(struct sctp_outq *); 1160 void sctp_outq_free(struct sctp_outq*); 1161 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1162 int sctp_outq_flush(struct sctp_outq *, int); 1163 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1164 int sctp_outq_is_empty(const struct sctp_outq *); 1165 void sctp_outq_restart(struct sctp_outq *); 1166 1167 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1168 sctp_retransmit_reason_t); 1169 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1170 int sctp_outq_uncork(struct sctp_outq *); 1171 /* Uncork and flush an outqueue. */ 1172 static inline void sctp_outq_cork(struct sctp_outq *q) 1173 { 1174 q->cork = 1; 1175 } 1176 1177 /* These bind address data fields common between endpoints and associations */ 1178 struct sctp_bind_addr { 1179 1180 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1181 * 1182 * SCTP Port: The local SCTP port number the endpoint is 1183 * bound to. 1184 */ 1185 __u16 port; 1186 1187 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1188 * 1189 * Address List: The list of IP addresses that this instance 1190 * has bound. This information is passed to one's 1191 * peer(s) in INIT and INIT ACK chunks. 1192 */ 1193 struct list_head address_list; 1194 1195 int malloced; /* Are we kfree()able? */ 1196 }; 1197 1198 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1199 void sctp_bind_addr_free(struct sctp_bind_addr *); 1200 int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1201 const struct sctp_bind_addr *src, 1202 sctp_scope_t scope, gfp_t gfp, 1203 int flags); 1204 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1205 const struct sctp_bind_addr *src, 1206 gfp_t gfp); 1207 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1208 __u8 addr_state, gfp_t gfp); 1209 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1210 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1211 struct sctp_sock *); 1212 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1213 const union sctp_addr *addr); 1214 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1215 const union sctp_addr *addrs, 1216 int addrcnt, 1217 struct sctp_sock *opt); 1218 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1219 int *addrs_len, 1220 gfp_t gfp); 1221 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1222 __u16 port, gfp_t gfp); 1223 1224 sctp_scope_t sctp_scope(const union sctp_addr *); 1225 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1226 int sctp_is_any(const union sctp_addr *addr); 1227 int sctp_addr_is_valid(const union sctp_addr *addr); 1228 1229 1230 /* What type of endpoint? */ 1231 typedef enum { 1232 SCTP_EP_TYPE_SOCKET, 1233 SCTP_EP_TYPE_ASSOCIATION, 1234 } sctp_endpoint_type_t; 1235 1236 /* 1237 * A common base class to bridge the implmentation view of a 1238 * socket (usually listening) endpoint versus an association's 1239 * local endpoint. 1240 * This common structure is useful for several purposes: 1241 * 1) Common interface for lookup routines. 1242 * a) Subfunctions work for either endpoint or association 1243 * b) Single interface to lookup allows hiding the lookup lock rather 1244 * than acquiring it externally. 1245 * 2) Common interface for the inbound chunk handling/state machine. 1246 * 3) Common object handling routines for reference counting, etc. 1247 * 4) Disentangle association lookup from endpoint lookup, where we 1248 * do not have to find our endpoint to find our association. 1249 * 1250 */ 1251 1252 struct sctp_ep_common { 1253 /* Fields to help us manage our entries in the hash tables. */ 1254 struct hlist_node node; 1255 int hashent; 1256 1257 /* Runtime type information. What kind of endpoint is this? */ 1258 sctp_endpoint_type_t type; 1259 1260 /* Some fields to help us manage this object. 1261 * refcnt - Reference count access to this object. 1262 * dead - Do not attempt to use this object. 1263 * malloced - Do we need to kfree this object? 1264 */ 1265 atomic_t refcnt; 1266 char dead; 1267 char malloced; 1268 1269 /* What socket does this endpoint belong to? */ 1270 struct sock *sk; 1271 1272 /* This is where we receive inbound chunks. */ 1273 struct sctp_inq inqueue; 1274 1275 /* This substructure includes the defining parameters of the 1276 * endpoint: 1277 * bind_addr.port is our shared port number. 1278 * bind_addr.address_list is our set of local IP addresses. 1279 */ 1280 struct sctp_bind_addr bind_addr; 1281 }; 1282 1283 1284 /* RFC Section 1.4 Key Terms 1285 * 1286 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1287 * multi-homed host, an SCTP endpoint is represented to its peers as a 1288 * combination of a set of eligible destination transport addresses to 1289 * which SCTP packets can be sent and a set of eligible source 1290 * transport addresses from which SCTP packets can be received. 1291 * All transport addresses used by an SCTP endpoint must use the 1292 * same port number, but can use multiple IP addresses. A transport 1293 * address used by an SCTP endpoint must not be used by another 1294 * SCTP endpoint. In other words, a transport address is unique 1295 * to an SCTP endpoint. 1296 * 1297 * From an implementation perspective, each socket has one of these. 1298 * A TCP-style socket will have exactly one association on one of 1299 * these. An UDP-style socket will have multiple associations hanging 1300 * off one of these. 1301 */ 1302 1303 struct sctp_endpoint { 1304 /* Common substructure for endpoint and association. */ 1305 struct sctp_ep_common base; 1306 1307 /* Associations: A list of current associations and mappings 1308 * to the data consumers for each association. This 1309 * may be in the form of a hash table or other 1310 * implementation dependent structure. The data 1311 * consumers may be process identification 1312 * information such as file descriptors, named pipe 1313 * pointer, or table pointers dependent on how SCTP 1314 * is implemented. 1315 */ 1316 /* This is really a list of struct sctp_association entries. */ 1317 struct list_head asocs; 1318 1319 /* Secret Key: A secret key used by this endpoint to compute 1320 * the MAC. This SHOULD be a cryptographic quality 1321 * random number with a sufficient length. 1322 * Discussion in [RFC1750] can be helpful in 1323 * selection of the key. 1324 */ 1325 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1326 int current_key; 1327 int last_key; 1328 int key_changed_at; 1329 1330 /* digest: This is a digest of the sctp cookie. This field is 1331 * only used on the receive path when we try to validate 1332 * that the cookie has not been tampered with. We put 1333 * this here so we pre-allocate this once and can re-use 1334 * on every receive. 1335 */ 1336 __u8 *digest; 1337 1338 /* sendbuf acct. policy. */ 1339 __u32 sndbuf_policy; 1340 1341 /* rcvbuf acct. policy. */ 1342 __u32 rcvbuf_policy; 1343 1344 /* SCTP AUTH: array of the HMACs that will be allocated 1345 * we need this per association so that we don't serialize 1346 */ 1347 struct crypto_hash **auth_hmacs; 1348 1349 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1350 struct sctp_hmac_algo_param *auth_hmacs_list; 1351 1352 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1353 struct sctp_chunks_param *auth_chunk_list; 1354 1355 /* SCTP-AUTH: endpoint shared keys */ 1356 struct list_head endpoint_shared_keys; 1357 __u16 active_key_id; 1358 }; 1359 1360 /* Recover the outter endpoint structure. */ 1361 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1362 { 1363 struct sctp_endpoint *ep; 1364 1365 ep = container_of(base, struct sctp_endpoint, base); 1366 return ep; 1367 } 1368 1369 /* These are function signatures for manipulating endpoints. */ 1370 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1371 void sctp_endpoint_free(struct sctp_endpoint *); 1372 void sctp_endpoint_put(struct sctp_endpoint *); 1373 void sctp_endpoint_hold(struct sctp_endpoint *); 1374 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1375 struct sctp_association *sctp_endpoint_lookup_assoc( 1376 const struct sctp_endpoint *ep, 1377 const union sctp_addr *paddr, 1378 struct sctp_transport **); 1379 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1380 const union sctp_addr *); 1381 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1382 const union sctp_addr *); 1383 int sctp_has_association(const union sctp_addr *laddr, 1384 const union sctp_addr *paddr); 1385 1386 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1387 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1388 struct sctp_chunk **err_chunk); 1389 int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1390 const union sctp_addr *peer, 1391 sctp_init_chunk_t *init, gfp_t gfp); 1392 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1393 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1394 1395 struct sctp_inithdr_host { 1396 __u32 init_tag; 1397 __u32 a_rwnd; 1398 __u16 num_outbound_streams; 1399 __u16 num_inbound_streams; 1400 __u32 initial_tsn; 1401 }; 1402 1403 /* RFC2960 1404 * 1405 * 12. Recommended Transmission Control Block (TCB) Parameters 1406 * 1407 * This section details a recommended set of parameters that should 1408 * be contained within the TCB for an implementation. This section is 1409 * for illustrative purposes and should not be deemed as requirements 1410 * on an implementation or as an exhaustive list of all parameters 1411 * inside an SCTP TCB. Each implementation may need its own additional 1412 * parameters for optimization. 1413 */ 1414 1415 1416 /* Here we have information about each individual association. */ 1417 struct sctp_association { 1418 1419 /* A base structure common to endpoint and association. 1420 * In this context, it represents the associations's view 1421 * of the local endpoint of the association. 1422 */ 1423 struct sctp_ep_common base; 1424 1425 /* Associations on the same socket. */ 1426 struct list_head asocs; 1427 1428 /* association id. */ 1429 sctp_assoc_t assoc_id; 1430 1431 /* This is our parent endpoint. */ 1432 struct sctp_endpoint *ep; 1433 1434 /* These are those association elements needed in the cookie. */ 1435 struct sctp_cookie c; 1436 1437 /* This is all information about our peer. */ 1438 struct { 1439 /* rwnd 1440 * 1441 * Peer Rwnd : Current calculated value of the peer's rwnd. 1442 */ 1443 __u32 rwnd; 1444 1445 /* transport_addr_list 1446 * 1447 * Peer : A list of SCTP transport addresses that the 1448 * Transport : peer is bound to. This information is derived 1449 * Address : from the INIT or INIT ACK and is used to 1450 * List : associate an inbound packet with a given 1451 * : association. Normally this information is 1452 * : hashed or keyed for quick lookup and access 1453 * : of the TCB. 1454 * : The list is also initialized with the list 1455 * : of addresses passed with the sctp_connectx() 1456 * : call. 1457 * 1458 * It is a list of SCTP_transport's. 1459 */ 1460 struct list_head transport_addr_list; 1461 1462 /* transport_count 1463 * 1464 * Peer : A count of the number of peer addresses 1465 * Transport : in the Peer Transport Address List. 1466 * Address : 1467 * Count : 1468 */ 1469 __u16 transport_count; 1470 1471 /* port 1472 * The transport layer port number. 1473 */ 1474 __u16 port; 1475 1476 /* primary_path 1477 * 1478 * Primary : This is the current primary destination 1479 * Path : transport address of the peer endpoint. It 1480 * : may also specify a source transport address 1481 * : on this endpoint. 1482 * 1483 * All of these paths live on transport_addr_list. 1484 * 1485 * At the bakeoffs, we discovered that the intent of 1486 * primaryPath is that it only changes when the ULP 1487 * asks to have it changed. We add the activePath to 1488 * designate the connection we are currently using to 1489 * transmit new data and most control chunks. 1490 */ 1491 struct sctp_transport *primary_path; 1492 1493 /* Cache the primary path address here, when we 1494 * need a an address for msg_name. 1495 */ 1496 union sctp_addr primary_addr; 1497 1498 /* active_path 1499 * The path that we are currently using to 1500 * transmit new data and most control chunks. 1501 */ 1502 struct sctp_transport *active_path; 1503 1504 /* retran_path 1505 * 1506 * RFC2960 6.4 Multi-homed SCTP Endpoints 1507 * ... 1508 * Furthermore, when its peer is multi-homed, an 1509 * endpoint SHOULD try to retransmit a chunk to an 1510 * active destination transport address that is 1511 * different from the last destination address to 1512 * which the DATA chunk was sent. 1513 */ 1514 struct sctp_transport *retran_path; 1515 1516 /* Pointer to last transport I have sent on. */ 1517 struct sctp_transport *last_sent_to; 1518 1519 /* This is the last transport I have received DATA on. */ 1520 struct sctp_transport *last_data_from; 1521 1522 /* 1523 * Mapping An array of bits or bytes indicating which out of 1524 * Array order TSN's have been received (relative to the 1525 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1526 * order packets have been received, this array 1527 * will be set to all zero. This structure may be 1528 * in the form of a circular buffer or bit array. 1529 * 1530 * Last Rcvd : This is the last TSN received in 1531 * TSN : sequence. This value is set initially by 1532 * : taking the peer's Initial TSN, received in 1533 * : the INIT or INIT ACK chunk, and subtracting 1534 * : one from it. 1535 * 1536 * Throughout most of the specification this is called the 1537 * "Cumulative TSN ACK Point". In this case, we 1538 * ignore the advice in 12.2 in favour of the term 1539 * used in the bulk of the text. This value is hidden 1540 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1541 */ 1542 struct sctp_tsnmap tsn_map; 1543 __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; 1544 1545 /* Ack State : This flag indicates if the next received 1546 * : packet is to be responded to with a 1547 * : SACK. This is initializedto 0. When a packet 1548 * : is received it is incremented. If this value 1549 * : reaches 2 or more, a SACK is sent and the 1550 * : value is reset to 0. Note: This is used only 1551 * : when no DATA chunks are received out of 1552 * : order. When DATA chunks are out of order, 1553 * : SACK's are not delayed (see Section 6). 1554 */ 1555 __u8 sack_needed; /* Do we need to sack the peer? */ 1556 1557 /* These are capabilities which our peer advertised. */ 1558 __u8 ecn_capable; /* Can peer do ECN? */ 1559 __u8 ipv4_address; /* Peer understands IPv4 addresses? */ 1560 __u8 ipv6_address; /* Peer understands IPv6 addresses? */ 1561 __u8 hostname_address;/* Peer understands DNS addresses? */ 1562 __u8 asconf_capable; /* Does peer support ADDIP? */ 1563 __u8 prsctp_capable; /* Can peer do PR-SCTP? */ 1564 __u8 auth_capable; /* Is peer doing SCTP-AUTH? */ 1565 1566 __u32 adaptation_ind; /* Adaptation Code point. */ 1567 1568 /* This mask is used to disable sending the ASCONF chunk 1569 * with specified parameter to peer. 1570 */ 1571 __be16 addip_disabled_mask; 1572 1573 struct sctp_inithdr_host i; 1574 int cookie_len; 1575 void *cookie; 1576 1577 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1578 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1579 * Initial TSN Value minus 1 1580 */ 1581 __u32 addip_serial; 1582 1583 /* SCTP-AUTH: We need to know pears random number, hmac list 1584 * and authenticated chunk list. All that is part of the 1585 * cookie and these are just pointers to those locations 1586 */ 1587 sctp_random_param_t *peer_random; 1588 sctp_chunks_param_t *peer_chunks; 1589 sctp_hmac_algo_param_t *peer_hmacs; 1590 } peer; 1591 1592 /* State : A state variable indicating what state the 1593 * : association is in, i.e. COOKIE-WAIT, 1594 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1595 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1596 * 1597 * Note: No "CLOSED" state is illustrated since if a 1598 * association is "CLOSED" its TCB SHOULD be removed. 1599 * 1600 * In this implementation we DO have a CLOSED 1601 * state which is used during initiation and shutdown. 1602 * 1603 * State takes values from SCTP_STATE_*. 1604 */ 1605 sctp_state_t state; 1606 1607 /* The cookie life I award for any cookie. */ 1608 struct timeval cookie_life; 1609 1610 /* Overall : The overall association error count. 1611 * Error Count : [Clear this any time I get something.] 1612 */ 1613 int overall_error_count; 1614 1615 /* These are the association's initial, max, and min RTO values. 1616 * These values will be initialized by system defaults, but can 1617 * be modified via the SCTP_RTOINFO socket option. 1618 */ 1619 unsigned long rto_initial; 1620 unsigned long rto_max; 1621 unsigned long rto_min; 1622 1623 /* Maximum number of new data packets that can be sent in a burst. */ 1624 int max_burst; 1625 1626 /* This is the max_retrans value for the association. This value will 1627 * be initialized initialized from system defaults, but can be 1628 * modified by the SCTP_ASSOCINFO socket option. 1629 */ 1630 int max_retrans; 1631 1632 /* Maximum number of times the endpoint will retransmit INIT */ 1633 __u16 max_init_attempts; 1634 1635 /* How many times have we resent an INIT? */ 1636 __u16 init_retries; 1637 1638 /* The largest timeout or RTO value to use in attempting an INIT */ 1639 unsigned long max_init_timeo; 1640 1641 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1642 * the destination address every heartbeat interval. This value 1643 * will be inherited by all new transports. 1644 */ 1645 unsigned long hbinterval; 1646 1647 /* This is the max_retrans value for new transports in the 1648 * association. 1649 */ 1650 __u16 pathmaxrxt; 1651 1652 /* Flag that path mtu update is pending */ 1653 __u8 pmtu_pending; 1654 1655 /* Association : The smallest PMTU discovered for all of the 1656 * PMTU : peer's transport addresses. 1657 */ 1658 __u32 pathmtu; 1659 1660 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1661 __u32 param_flags; 1662 1663 /* SACK delay timeout */ 1664 unsigned long sackdelay; 1665 1666 1667 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1668 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1669 1670 /* Transport to which SHUTDOWN chunk was last sent. */ 1671 struct sctp_transport *shutdown_last_sent_to; 1672 1673 /* How many times have we resent a SHUTDOWN */ 1674 int shutdown_retries; 1675 1676 /* Transport to which INIT chunk was last sent. */ 1677 struct sctp_transport *init_last_sent_to; 1678 1679 /* Next TSN : The next TSN number to be assigned to a new 1680 * : DATA chunk. This is sent in the INIT or INIT 1681 * : ACK chunk to the peer and incremented each 1682 * : time a DATA chunk is assigned a TSN 1683 * : (normally just prior to transmit or during 1684 * : fragmentation). 1685 */ 1686 __u32 next_tsn; 1687 1688 /* 1689 * Last Rcvd : This is the last TSN received in sequence. This value 1690 * TSN : is set initially by taking the peer's Initial TSN, 1691 * : received in the INIT or INIT ACK chunk, and 1692 * : subtracting one from it. 1693 * 1694 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1695 */ 1696 1697 __u32 ctsn_ack_point; 1698 1699 /* PR-SCTP Advanced.Peer.Ack.Point */ 1700 __u32 adv_peer_ack_point; 1701 1702 /* Highest TSN that is acknowledged by incoming SACKs. */ 1703 __u32 highest_sacked; 1704 1705 /* The number of unacknowledged data chunks. Reported through 1706 * the SCTP_STATUS sockopt. 1707 */ 1708 __u16 unack_data; 1709 1710 /* The total number of data chunks that we've had to retransmit 1711 * as the result of a T3 timer expiration 1712 */ 1713 __u32 rtx_data_chunks; 1714 1715 /* This is the association's receive buffer space. This value is used 1716 * to set a_rwnd field in an INIT or a SACK chunk. 1717 */ 1718 __u32 rwnd; 1719 1720 /* This is the last advertised value of rwnd over a SACK chunk. */ 1721 __u32 a_rwnd; 1722 1723 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1724 * to slop over a maximum of the association's frag_point. 1725 */ 1726 __u32 rwnd_over; 1727 1728 /* This is the sndbuf size in use for the association. 1729 * This corresponds to the sndbuf size for the association, 1730 * as specified in the sk->sndbuf. 1731 */ 1732 int sndbuf_used; 1733 1734 /* This is the amount of memory that this association has allocated 1735 * in the receive path at any given time. 1736 */ 1737 atomic_t rmem_alloc; 1738 1739 /* This is the wait queue head for send requests waiting on 1740 * the association sndbuf space. 1741 */ 1742 wait_queue_head_t wait; 1743 1744 /* The message size at which SCTP fragmentation will occur. */ 1745 __u32 frag_point; 1746 1747 /* Counter used to count INIT errors. */ 1748 int init_err_counter; 1749 1750 /* Count the number of INIT cycles (for doubling timeout). */ 1751 int init_cycle; 1752 1753 /* Default send parameters. */ 1754 __u16 default_stream; 1755 __u16 default_flags; 1756 __u32 default_ppid; 1757 __u32 default_context; 1758 __u32 default_timetolive; 1759 1760 /* Default receive parameters */ 1761 __u32 default_rcv_context; 1762 1763 /* This tracks outbound ssn for a given stream. */ 1764 struct sctp_ssnmap *ssnmap; 1765 1766 /* All outbound chunks go through this structure. */ 1767 struct sctp_outq outqueue; 1768 1769 /* A smart pipe that will handle reordering and fragmentation, 1770 * as well as handle passing events up to the ULP. 1771 */ 1772 struct sctp_ulpq ulpq; 1773 1774 /* Last TSN that caused an ECNE Chunk to be sent. */ 1775 __u32 last_ecne_tsn; 1776 1777 /* Last TSN that caused a CWR Chunk to be sent. */ 1778 __u32 last_cwr_tsn; 1779 1780 /* How many duplicated TSNs have we seen? */ 1781 int numduptsns; 1782 1783 /* Number of seconds of idle time before an association is closed. 1784 * In the association context, this is really used as a boolean 1785 * since the real timeout is stored in the timeouts array 1786 */ 1787 __u32 autoclose; 1788 1789 /* These are to support 1790 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1791 * and Enforcement of Flow and Message Limits" 1792 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1793 * or "ADDIP" for short. 1794 */ 1795 1796 1797 1798 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1799 * 1800 * R1) One and only one ASCONF Chunk MAY be in transit and 1801 * unacknowledged at any one time. If a sender, after sending 1802 * an ASCONF chunk, decides it needs to transfer another 1803 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1804 * returns from the previous ASCONF Chunk before sending a 1805 * subsequent ASCONF. Note this restriction binds each side, 1806 * so at any time two ASCONF may be in-transit on any given 1807 * association (one sent from each endpoint). 1808 * 1809 * [This is our one-and-only-one ASCONF in flight. If we do 1810 * not have an ASCONF in flight, this is NULL.] 1811 */ 1812 struct sctp_chunk *addip_last_asconf; 1813 1814 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1815 * 1816 * This is needed to implement itmes E1 - E4 of the updated 1817 * spec. Here is the justification: 1818 * 1819 * Since the peer may bundle multiple ASCONF chunks toward us, 1820 * we now need the ability to cache multiple ACKs. The section 1821 * describes in detail how they are cached and cleaned up. 1822 */ 1823 struct list_head asconf_ack_list; 1824 1825 /* These ASCONF chunks are waiting to be sent. 1826 * 1827 * These chunaks can't be pushed to outqueue until receiving 1828 * ASCONF_ACK for the previous ASCONF indicated by 1829 * addip_last_asconf, so as to guarantee that only one ASCONF 1830 * is in flight at any time. 1831 * 1832 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1833 * 1834 * In defining the ASCONF Chunk transfer procedures, it is 1835 * essential that these transfers MUST NOT cause congestion 1836 * within the network. To achieve this, we place these 1837 * restrictions on the transfer of ASCONF Chunks: 1838 * 1839 * R1) One and only one ASCONF Chunk MAY be in transit and 1840 * unacknowledged at any one time. If a sender, after sending 1841 * an ASCONF chunk, decides it needs to transfer another 1842 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1843 * returns from the previous ASCONF Chunk before sending a 1844 * subsequent ASCONF. Note this restriction binds each side, 1845 * so at any time two ASCONF may be in-transit on any given 1846 * association (one sent from each endpoint). 1847 * 1848 * 1849 * [I really think this is EXACTLY the sort of intelligence 1850 * which already resides in sctp_outq. Please move this 1851 * queue and its supporting logic down there. --piggy] 1852 */ 1853 struct list_head addip_chunk_list; 1854 1855 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1856 * 1857 * A2) A serial number should be assigned to the Chunk. The 1858 * serial number SHOULD be a monotonically increasing 1859 * number. The serial number SHOULD be initialized at 1860 * the start of the association to the same value as the 1861 * Initial TSN and every time a new ASCONF chunk is created 1862 * it is incremented by one after assigning the serial number 1863 * to the newly created chunk. 1864 * 1865 * ADDIP 1866 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1867 * 1868 * Serial Number : 32 bits (unsigned integer) 1869 * 1870 * This value represents a Serial Number for the ASCONF 1871 * Chunk. The valid range of Serial Number is from 0 to 1872 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1873 * after reaching 4294967295. 1874 */ 1875 __u32 addip_serial; 1876 1877 /* SCTP AUTH: list of the endpoint shared keys. These 1878 * keys are provided out of band by the user applicaton 1879 * and can't change during the lifetime of the association 1880 */ 1881 struct list_head endpoint_shared_keys; 1882 1883 /* SCTP AUTH: 1884 * The current generated assocaition shared key (secret) 1885 */ 1886 struct sctp_auth_bytes *asoc_shared_key; 1887 1888 /* SCTP AUTH: hmac id of the first peer requested algorithm 1889 * that we support. 1890 */ 1891 __u16 default_hmac_id; 1892 1893 __u16 active_key_id; 1894 1895 /* Need to send an ECNE Chunk? */ 1896 char need_ecne; 1897 1898 /* Is it a temporary association? */ 1899 char temp; 1900 }; 1901 1902 1903 /* An eyecatcher for determining if we are really looking at an 1904 * association data structure. 1905 */ 1906 enum { 1907 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1908 }; 1909 1910 /* Recover the outter association structure. */ 1911 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1912 { 1913 struct sctp_association *asoc; 1914 1915 asoc = container_of(base, struct sctp_association, base); 1916 return asoc; 1917 } 1918 1919 /* These are function signatures for manipulating associations. */ 1920 1921 1922 struct sctp_association * 1923 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1924 sctp_scope_t scope, gfp_t gfp); 1925 void sctp_association_free(struct sctp_association *); 1926 void sctp_association_put(struct sctp_association *); 1927 void sctp_association_hold(struct sctp_association *); 1928 1929 struct sctp_transport *sctp_assoc_choose_init_transport( 1930 struct sctp_association *); 1931 struct sctp_transport *sctp_assoc_choose_shutdown_transport( 1932 struct sctp_association *); 1933 void sctp_assoc_update_retran_path(struct sctp_association *); 1934 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1935 const union sctp_addr *); 1936 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1937 const union sctp_addr *laddr); 1938 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1939 const union sctp_addr *address, 1940 const gfp_t gfp, 1941 const int peer_state); 1942 void sctp_assoc_del_peer(struct sctp_association *asoc, 1943 const union sctp_addr *addr); 1944 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1945 struct sctp_transport *peer); 1946 void sctp_assoc_control_transport(struct sctp_association *, 1947 struct sctp_transport *, 1948 sctp_transport_cmd_t, sctp_sn_error_t); 1949 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1950 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1951 const union sctp_addr *, 1952 const union sctp_addr *); 1953 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1954 void sctp_assoc_update(struct sctp_association *old, 1955 struct sctp_association *new); 1956 1957 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1958 1959 void sctp_assoc_sync_pmtu(struct sctp_association *); 1960 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1961 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1962 void sctp_assoc_set_primary(struct sctp_association *, 1963 struct sctp_transport *); 1964 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1965 struct sctp_transport *); 1966 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1967 gfp_t); 1968 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1969 struct sctp_cookie*, 1970 gfp_t gfp); 1971 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1972 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1973 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1974 const struct sctp_association *asoc, 1975 __be32 serial); 1976 1977 1978 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1979 const union sctp_addr *ss2); 1980 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1981 1982 /* A convenience structure to parse out SCTP specific CMSGs. */ 1983 typedef struct sctp_cmsgs { 1984 struct sctp_initmsg *init; 1985 struct sctp_sndrcvinfo *info; 1986 } sctp_cmsgs_t; 1987 1988 /* Structure for tracking memory objects */ 1989 typedef struct { 1990 char *label; 1991 atomic_t *counter; 1992 } sctp_dbg_objcnt_entry_t; 1993 1994 #endif /* __sctp_structs_h__ */ 1995