1 /* SCTP kernel reference 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 reference Implementation 8 * 9 * The SCTP reference 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 * The SCTP reference 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 }; 455 456 /* RFC 2960. Section 3.3.5 Heartbeat. 457 * Heartbeat Information: variable length 458 * The Sender-specific Heartbeat Info field should normally include 459 * information about the sender's current time when this HEARTBEAT 460 * chunk is sent and the destination transport address to which this 461 * HEARTBEAT is sent (see Section 8.3). 462 */ 463 typedef struct sctp_sender_hb_info { 464 struct sctp_paramhdr param_hdr; 465 union sctp_addr daddr; 466 unsigned long sent_at; 467 __u64 hb_nonce; 468 } __attribute__((packed)) sctp_sender_hb_info_t; 469 470 /* 471 * RFC 2960 1.3.2 Sequenced Delivery within Streams 472 * 473 * The term "stream" is used in SCTP to refer to a sequence of user 474 * messages that are to be delivered to the upper-layer protocol in 475 * order with respect to other messages within the same stream. This is 476 * in contrast to its usage in TCP, where it refers to a sequence of 477 * bytes (in this document a byte is assumed to be eight bits). 478 * ... 479 * 480 * This is the structure we use to track both our outbound and inbound 481 * SSN, or Stream Sequence Numbers. 482 */ 483 484 struct sctp_stream { 485 __u16 *ssn; 486 unsigned int len; 487 }; 488 489 struct sctp_ssnmap { 490 struct sctp_stream in; 491 struct sctp_stream out; 492 int malloced; 493 }; 494 495 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 496 gfp_t gfp); 497 void sctp_ssnmap_free(struct sctp_ssnmap *map); 498 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 499 500 /* What is the current SSN number for this stream? */ 501 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 502 { 503 return stream->ssn[id]; 504 } 505 506 /* Return the next SSN number for this stream. */ 507 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 508 { 509 return stream->ssn[id]++; 510 } 511 512 /* Skip over this ssn and all below. */ 513 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 514 __u16 ssn) 515 { 516 stream->ssn[id] = ssn+1; 517 } 518 519 /* 520 * Pointers to address related SCTP functions. 521 * (i.e. things that depend on the address family.) 522 */ 523 struct sctp_af { 524 int (*sctp_xmit) (struct sk_buff *skb, 525 struct sctp_transport *, 526 int ipfragok); 527 int (*setsockopt) (struct sock *sk, 528 int level, 529 int optname, 530 char __user *optval, 531 int optlen); 532 int (*getsockopt) (struct sock *sk, 533 int level, 534 int optname, 535 char __user *optval, 536 int __user *optlen); 537 int (*compat_setsockopt) (struct sock *sk, 538 int level, 539 int optname, 540 char __user *optval, 541 int optlen); 542 int (*compat_getsockopt) (struct sock *sk, 543 int level, 544 int optname, 545 char __user *optval, 546 int __user *optlen); 547 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 548 union sctp_addr *daddr, 549 union sctp_addr *saddr); 550 void (*get_saddr) (struct sctp_association *asoc, 551 struct dst_entry *dst, 552 union sctp_addr *daddr, 553 union sctp_addr *saddr); 554 void (*copy_addrlist) (struct list_head *, 555 struct net_device *); 556 void (*dst_saddr) (union sctp_addr *saddr, 557 struct dst_entry *dst, 558 __be16 port); 559 int (*cmp_addr) (const union sctp_addr *addr1, 560 const union sctp_addr *addr2); 561 void (*addr_copy) (union sctp_addr *dst, 562 union sctp_addr *src); 563 void (*from_skb) (union sctp_addr *, 564 struct sk_buff *skb, 565 int saddr); 566 void (*from_sk) (union sctp_addr *, 567 struct sock *sk); 568 void (*to_sk_saddr) (union sctp_addr *, 569 struct sock *sk); 570 void (*to_sk_daddr) (union sctp_addr *, 571 struct sock *sk); 572 void (*from_addr_param) (union sctp_addr *, 573 union sctp_addr_param *, 574 __be16 port, int iif); 575 int (*to_addr_param) (const union sctp_addr *, 576 union sctp_addr_param *); 577 int (*addr_valid) (union sctp_addr *, 578 struct sctp_sock *, 579 const struct sk_buff *); 580 sctp_scope_t (*scope) (union sctp_addr *); 581 void (*inaddr_any) (union sctp_addr *, __be16); 582 int (*is_any) (const union sctp_addr *); 583 int (*available) (union sctp_addr *, 584 struct sctp_sock *); 585 int (*skb_iif) (const struct sk_buff *sk); 586 int (*is_ce) (const struct sk_buff *sk); 587 void (*seq_dump_addr)(struct seq_file *seq, 588 union sctp_addr *addr); 589 __u16 net_header_len; 590 int sockaddr_len; 591 sa_family_t sa_family; 592 struct list_head list; 593 }; 594 595 struct sctp_af *sctp_get_af_specific(sa_family_t); 596 int sctp_register_af(struct sctp_af *); 597 598 /* Protocol family functions. */ 599 struct sctp_pf { 600 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 601 void (*skb_msgname) (struct sk_buff *, char *, int *); 602 int (*af_supported) (sa_family_t, struct sctp_sock *); 603 int (*cmp_addr) (const union sctp_addr *, 604 const union sctp_addr *, 605 struct sctp_sock *); 606 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 607 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 608 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 609 struct sock *(*create_accept_sk) (struct sock *sk, 610 struct sctp_association *asoc); 611 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 612 struct sctp_af *af; 613 }; 614 615 616 /* Structure to track chunk fragments that have been acked, but peer 617 * fragments of the same message have not. 618 */ 619 struct sctp_datamsg { 620 /* Chunks waiting to be submitted to lower layer. */ 621 struct list_head chunks; 622 /* Chunks that have been transmitted. */ 623 struct list_head track; 624 /* Reference counting. */ 625 atomic_t refcnt; 626 /* When is this message no longer interesting to the peer? */ 627 unsigned long expires_at; 628 /* Did the messenge fail to send? */ 629 int send_error; 630 char send_failed; 631 /* Control whether chunks from this message can be abandoned. */ 632 char can_abandon; 633 }; 634 635 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 636 struct sctp_sndrcvinfo *, 637 struct msghdr *, int len); 638 void sctp_datamsg_put(struct sctp_datamsg *); 639 void sctp_datamsg_free(struct sctp_datamsg *); 640 void sctp_datamsg_track(struct sctp_chunk *); 641 void sctp_chunk_fail(struct sctp_chunk *, int error); 642 int sctp_chunk_abandoned(struct sctp_chunk *); 643 644 /* RFC2960 1.4 Key Terms 645 * 646 * o Chunk: A unit of information within an SCTP packet, consisting of 647 * a chunk header and chunk-specific content. 648 * 649 * As a matter of convenience, we remember the SCTP common header for 650 * each chunk as well as a few other header pointers... 651 */ 652 struct sctp_chunk { 653 struct list_head list; 654 655 atomic_t refcnt; 656 657 /* This is our link to the per-transport transmitted list. */ 658 struct list_head transmitted_list; 659 660 /* This field is used by chunks that hold fragmented data. 661 * For the first fragment this is the list that holds the rest of 662 * fragments. For the remaining fragments, this is the link to the 663 * frag_list maintained in the first fragment. 664 */ 665 struct list_head frag_list; 666 667 /* This points to the sk_buff containing the actual data. */ 668 struct sk_buff *skb; 669 670 /* These are the SCTP headers by reverse order in a packet. 671 * Note that some of these may happen more than once. In that 672 * case, we point at the "current" one, whatever that means 673 * for that level of header. 674 */ 675 676 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 677 union sctp_params param_hdr; 678 union { 679 __u8 *v; 680 struct sctp_datahdr *data_hdr; 681 struct sctp_inithdr *init_hdr; 682 struct sctp_sackhdr *sack_hdr; 683 struct sctp_heartbeathdr *hb_hdr; 684 struct sctp_sender_hb_info *hbs_hdr; 685 struct sctp_shutdownhdr *shutdown_hdr; 686 struct sctp_signed_cookie *cookie_hdr; 687 struct sctp_ecnehdr *ecne_hdr; 688 struct sctp_cwrhdr *ecn_cwr_hdr; 689 struct sctp_errhdr *err_hdr; 690 struct sctp_addiphdr *addip_hdr; 691 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 692 struct sctp_authhdr *auth_hdr; 693 } subh; 694 695 __u8 *chunk_end; 696 697 struct sctp_chunkhdr *chunk_hdr; 698 struct sctphdr *sctp_hdr; 699 700 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 701 struct sctp_sndrcvinfo sinfo; 702 703 /* Which association does this belong to? */ 704 struct sctp_association *asoc; 705 706 /* What endpoint received this chunk? */ 707 struct sctp_ep_common *rcvr; 708 709 /* We fill this in if we are calculating RTT. */ 710 unsigned long sent_at; 711 712 /* What is the origin IP address for this chunk? */ 713 union sctp_addr source; 714 /* Destination address for this chunk. */ 715 union sctp_addr dest; 716 717 /* For outbound message, track all fragments for SEND_FAILED. */ 718 struct sctp_datamsg *msg; 719 720 /* For an inbound chunk, this tells us where it came from. 721 * For an outbound chunk, it tells us where we'd like it to 722 * go. It is NULL if we have no preference. 723 */ 724 struct sctp_transport *transport; 725 726 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 727 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 728 * spec violates the principle premis that all chunks are processed 729 * in order. 730 */ 731 struct sk_buff *auth_chunk; 732 733 __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ 734 __u8 resent; /* Has this chunk ever been retransmitted. */ 735 __u8 has_tsn; /* Does this chunk have a TSN yet? */ 736 __u8 has_ssn; /* Does this chunk have a SSN yet? */ 737 __u8 singleton; /* Was this the only chunk in the packet? */ 738 __u8 end_of_packet; /* Was this the last chunk in the packet? */ 739 __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ 740 __u8 pdiscard; /* Discard the whole packet now? */ 741 __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ 742 __s8 fast_retransmit; /* Is this chunk fast retransmitted? */ 743 __u8 tsn_missing_report; /* Data chunk missing counter. */ 744 __u8 data_accepted; /* At least 1 chunk in this packet accepted */ 745 __u8 auth; /* IN: was auth'ed | OUT: needs auth */ 746 }; 747 748 void sctp_chunk_hold(struct sctp_chunk *); 749 void sctp_chunk_put(struct sctp_chunk *); 750 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 751 struct iovec *data); 752 void sctp_chunk_free(struct sctp_chunk *); 753 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 754 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 755 const struct sctp_association *, 756 struct sock *); 757 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 758 union sctp_addr *); 759 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 760 761 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 762 struct sctp_sockaddr_entry { 763 struct list_head list; 764 struct rcu_head rcu; 765 union sctp_addr a; 766 __u8 use_as_src; 767 __u8 valid; 768 }; 769 770 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 771 772 /* This structure holds lists of chunks as we are assembling for 773 * transmission. 774 */ 775 struct sctp_packet { 776 /* These are the SCTP header values (host order) for the packet. */ 777 __u16 source_port; 778 __u16 destination_port; 779 __u32 vtag; 780 781 /* This contains the payload chunks. */ 782 struct list_head chunk_list; 783 784 /* This is the overhead of the sctp and ip headers. */ 785 size_t overhead; 786 /* This is the total size of all chunks INCLUDING padding. */ 787 size_t size; 788 789 /* The packet is destined for this transport address. 790 * The function we finally use to pass down to the next lower 791 * layer lives in the transport structure. 792 */ 793 struct sctp_transport *transport; 794 795 /* pointer to the auth chunk for this packet */ 796 struct sctp_chunk *auth; 797 798 /* This packet contains a COOKIE-ECHO chunk. */ 799 __u8 has_cookie_echo; 800 801 /* This packet contains a SACK chunk. */ 802 __u8 has_sack; 803 804 /* This packet contains an AUTH chunk */ 805 __u8 has_auth; 806 807 /* This packet contains at least 1 DATA chunk */ 808 __u8 has_data; 809 810 /* SCTP cannot fragment this packet. So let ip fragment it. */ 811 __u8 ipfragok; 812 813 __u8 malloced; 814 }; 815 816 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 817 struct sctp_transport *, 818 __u16 sport, __u16 dport); 819 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 820 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 821 struct sctp_chunk *); 822 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 823 struct sctp_chunk *); 824 int sctp_packet_transmit(struct sctp_packet *); 825 void sctp_packet_free(struct sctp_packet *); 826 827 static inline int sctp_packet_empty(struct sctp_packet *packet) 828 { 829 return (packet->size == packet->overhead); 830 } 831 832 /* This represents a remote transport address. 833 * For local transport addresses, we just use union sctp_addr. 834 * 835 * RFC2960 Section 1.4 Key Terms 836 * 837 * o Transport address: A Transport Address is traditionally defined 838 * by Network Layer address, Transport Layer protocol and Transport 839 * Layer port number. In the case of SCTP running over IP, a 840 * transport address is defined by the combination of an IP address 841 * and an SCTP port number (where SCTP is the Transport protocol). 842 * 843 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 844 * 845 * o The sender keeps a separate congestion control parameter set for 846 * each of the destination addresses it can send to (not each 847 * source-destination pair but for each destination). The parameters 848 * should decay if the address is not used for a long enough time 849 * period. 850 * 851 */ 852 struct sctp_transport { 853 /* A list of transports. */ 854 struct list_head transports; 855 856 /* Reference counting. */ 857 atomic_t refcnt; 858 int dead; 859 860 /* This is the peer's IP address and port. */ 861 union sctp_addr ipaddr; 862 863 /* These are the functions we call to handle LLP stuff. */ 864 struct sctp_af *af_specific; 865 866 /* Which association do we belong to? */ 867 struct sctp_association *asoc; 868 869 /* RFC2960 870 * 871 * 12.3 Per Transport Address Data 872 * 873 * For each destination transport address in the peer's 874 * address list derived from the INIT or INIT ACK chunk, a 875 * number of data elements needs to be maintained including: 876 */ 877 /* RTO : The current retransmission timeout value. */ 878 unsigned long rto; 879 unsigned long last_rto; 880 881 __u32 rtt; /* This is the most recent RTT. */ 882 883 /* RTTVAR : The current RTT variation. */ 884 __u32 rttvar; 885 886 /* SRTT : The current smoothed round trip time. */ 887 __u32 srtt; 888 889 /* RTO-Pending : A flag used to track if one of the DATA 890 * chunks sent to this address is currently being 891 * used to compute a RTT. If this flag is 0, 892 * the next DATA chunk sent to this destination 893 * should be used to compute a RTT and this flag 894 * should be set. Every time the RTT 895 * calculation completes (i.e. the DATA chunk 896 * is SACK'd) clear this flag. 897 */ 898 int rto_pending; 899 900 /* 901 * These are the congestion stats. 902 */ 903 /* cwnd : The current congestion window. */ 904 __u32 cwnd; /* This is the actual cwnd. */ 905 906 /* ssthresh : The current slow start threshold value. */ 907 __u32 ssthresh; 908 909 /* partial : The tracking method for increase of cwnd when in 910 * bytes acked : congestion avoidance mode (see Section 6.2.2) 911 */ 912 __u32 partial_bytes_acked; 913 914 /* Data that has been sent, but not acknowledged. */ 915 __u32 flight_size; 916 917 /* Destination */ 918 struct dst_entry *dst; 919 /* Source address. */ 920 union sctp_addr saddr; 921 922 /* When was the last time(in jiffies) that a data packet was sent on 923 * this transport? This is used to adjust the cwnd when the transport 924 * becomes inactive. 925 */ 926 unsigned long last_time_used; 927 928 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 929 * the destination address every heartbeat interval. 930 */ 931 unsigned long hbinterval; 932 933 /* SACK delay timeout */ 934 unsigned long sackdelay; 935 936 /* When was the last time (in jiffies) that we heard from this 937 * transport? We use this to pick new active and retran paths. 938 */ 939 unsigned long last_time_heard; 940 941 /* Last time(in jiffies) when cwnd is reduced due to the congestion 942 * indication based on ECNE chunk. 943 */ 944 unsigned long last_time_ecne_reduced; 945 946 /* This is the max_retrans value for the transport and will 947 * be initialized from the assocs value. This can be changed 948 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 949 */ 950 __u16 pathmaxrxt; 951 952 /* is the Path MTU update pending on this tranport */ 953 __u8 pmtu_pending; 954 955 /* PMTU : The current known path MTU. */ 956 __u32 pathmtu; 957 958 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 959 __u32 param_flags; 960 961 /* The number of times INIT has been sent on this transport. */ 962 int init_sent_count; 963 964 /* state : The current state of this destination, 965 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. 966 */ 967 int state; 968 969 /* These are the error stats for this destination. */ 970 971 /* Error count : The current error count for this destination. */ 972 unsigned short error_count; 973 974 /* Per : A timer used by each destination. 975 * Destination : 976 * Timer : 977 * 978 * [Everywhere else in the text this is called T3-rtx. -ed] 979 */ 980 struct timer_list T3_rtx_timer; 981 982 /* Heartbeat timer is per destination. */ 983 struct timer_list hb_timer; 984 985 /* Since we're using per-destination retransmission timers 986 * (see above), we're also using per-destination "transmitted" 987 * queues. This probably ought to be a private struct 988 * accessible only within the outqueue, but it's not, yet. 989 */ 990 struct list_head transmitted; 991 992 /* We build bundle-able packets for this transport here. */ 993 struct sctp_packet packet; 994 995 /* This is the list of transports that have chunks to send. */ 996 struct list_head send_ready; 997 998 int malloced; /* Is this structure kfree()able? */ 999 1000 /* State information saved for SFR_CACC algorithm. The key 1001 * idea in SFR_CACC is to maintain state at the sender on a 1002 * per-destination basis when a changeover happens. 1003 * char changeover_active; 1004 * char cycling_changeover; 1005 * __u32 next_tsn_at_change; 1006 * char cacc_saw_newack; 1007 */ 1008 struct { 1009 /* An unsigned integer, which stores the next TSN to be 1010 * used by the sender, at the moment of changeover. 1011 */ 1012 __u32 next_tsn_at_change; 1013 1014 /* A flag which indicates the occurrence of a changeover */ 1015 char changeover_active; 1016 1017 /* A flag which indicates whether the change of primary is 1018 * the first switch to this destination address during an 1019 * active switch. 1020 */ 1021 char cycling_changeover; 1022 1023 /* A temporary flag, which is used during the processing of 1024 * a SACK to estimate the causative TSN(s)'s group. 1025 */ 1026 char cacc_saw_newack; 1027 } cacc; 1028 1029 /* 64-bit random number sent with heartbeat. */ 1030 __u64 hb_nonce; 1031 }; 1032 1033 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1034 gfp_t); 1035 void sctp_transport_set_owner(struct sctp_transport *, 1036 struct sctp_association *); 1037 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1038 struct sctp_sock *); 1039 void sctp_transport_pmtu(struct sctp_transport *); 1040 void sctp_transport_free(struct sctp_transport *); 1041 void sctp_transport_reset_timers(struct sctp_transport *); 1042 void sctp_transport_hold(struct sctp_transport *); 1043 void sctp_transport_put(struct sctp_transport *); 1044 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1045 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1046 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1047 unsigned long sctp_transport_timeout(struct sctp_transport *); 1048 void sctp_transport_reset(struct sctp_transport *); 1049 void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1050 1051 1052 /* This is the structure we use to queue packets as they come into 1053 * SCTP. We write packets to it and read chunks from it. 1054 */ 1055 struct sctp_inq { 1056 /* This is actually a queue of sctp_chunk each 1057 * containing a partially decoded packet. 1058 */ 1059 struct list_head in_chunk_list; 1060 /* This is the packet which is currently off the in queue and is 1061 * being worked on through the inbound chunk processing. 1062 */ 1063 struct sctp_chunk *in_progress; 1064 1065 /* This is the delayed task to finish delivering inbound 1066 * messages. 1067 */ 1068 struct work_struct immediate; 1069 1070 int malloced; /* Is this structure kfree()able? */ 1071 }; 1072 1073 void sctp_inq_init(struct sctp_inq *); 1074 void sctp_inq_free(struct sctp_inq *); 1075 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1076 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1077 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1078 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1079 1080 /* This is the structure we use to hold outbound chunks. You push 1081 * chunks in and they automatically pop out the other end as bundled 1082 * packets (it calls (*output_handler)()). 1083 * 1084 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1085 * and 8.2 of the v13 draft. 1086 * 1087 * It handles retransmissions. The connection to the timeout portion 1088 * of the state machine is through sctp_..._timeout() and timeout_handler. 1089 * 1090 * If you feed it SACKs, it will eat them. 1091 * 1092 * If you give it big chunks, it will fragment them. 1093 * 1094 * It assigns TSN's to data chunks. This happens at the last possible 1095 * instant before transmission. 1096 * 1097 * When free()'d, it empties itself out via output_handler(). 1098 */ 1099 struct sctp_outq { 1100 struct sctp_association *asoc; 1101 1102 /* Data pending that has never been transmitted. */ 1103 struct list_head out_chunk_list; 1104 1105 unsigned out_qlen; /* Total length of queued data chunks. */ 1106 1107 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1108 unsigned error; 1109 1110 /* These are control chunks we want to send. */ 1111 struct list_head control_chunk_list; 1112 1113 /* These are chunks that have been sacked but are above the 1114 * CTSN, or cumulative tsn ack point. 1115 */ 1116 struct list_head sacked; 1117 1118 /* Put chunks on this list to schedule them for 1119 * retransmission. 1120 */ 1121 struct list_head retransmit; 1122 1123 /* Put chunks on this list to save them for FWD TSN processing as 1124 * they were abandoned. 1125 */ 1126 struct list_head abandoned; 1127 1128 /* How many unackd bytes do we have in-flight? */ 1129 __u32 outstanding_bytes; 1130 1131 /* Corked? */ 1132 char cork; 1133 1134 /* Is this structure empty? */ 1135 char empty; 1136 1137 /* Are we kfree()able? */ 1138 char malloced; 1139 }; 1140 1141 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1142 void sctp_outq_teardown(struct sctp_outq *); 1143 void sctp_outq_free(struct sctp_outq*); 1144 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1145 int sctp_outq_flush(struct sctp_outq *, int); 1146 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1147 int sctp_outq_is_empty(const struct sctp_outq *); 1148 void sctp_outq_restart(struct sctp_outq *); 1149 1150 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1151 sctp_retransmit_reason_t); 1152 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1153 int sctp_outq_uncork(struct sctp_outq *); 1154 /* Uncork and flush an outqueue. */ 1155 static inline void sctp_outq_cork(struct sctp_outq *q) 1156 { 1157 q->cork = 1; 1158 } 1159 1160 /* These bind address data fields common between endpoints and associations */ 1161 struct sctp_bind_addr { 1162 1163 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1164 * 1165 * SCTP Port: The local SCTP port number the endpoint is 1166 * bound to. 1167 */ 1168 __u16 port; 1169 1170 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1171 * 1172 * Address List: The list of IP addresses that this instance 1173 * has bound. This information is passed to one's 1174 * peer(s) in INIT and INIT ACK chunks. 1175 */ 1176 struct list_head address_list; 1177 1178 int malloced; /* Are we kfree()able? */ 1179 }; 1180 1181 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1182 void sctp_bind_addr_free(struct sctp_bind_addr *); 1183 int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1184 const struct sctp_bind_addr *src, 1185 sctp_scope_t scope, gfp_t gfp, 1186 int flags); 1187 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1188 const struct sctp_bind_addr *src, 1189 gfp_t gfp); 1190 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1191 __u8 use_as_src, gfp_t gfp); 1192 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1193 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1194 struct sctp_sock *); 1195 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1196 const union sctp_addr *addrs, 1197 int addrcnt, 1198 struct sctp_sock *opt); 1199 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1200 int *addrs_len, 1201 gfp_t gfp); 1202 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1203 __u16 port, gfp_t gfp); 1204 1205 sctp_scope_t sctp_scope(const union sctp_addr *); 1206 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1207 int sctp_is_any(const union sctp_addr *addr); 1208 int sctp_addr_is_valid(const union sctp_addr *addr); 1209 1210 1211 /* What type of endpoint? */ 1212 typedef enum { 1213 SCTP_EP_TYPE_SOCKET, 1214 SCTP_EP_TYPE_ASSOCIATION, 1215 } sctp_endpoint_type_t; 1216 1217 /* 1218 * A common base class to bridge the implmentation view of a 1219 * socket (usually listening) endpoint versus an association's 1220 * local endpoint. 1221 * This common structure is useful for several purposes: 1222 * 1) Common interface for lookup routines. 1223 * a) Subfunctions work for either endpoint or association 1224 * b) Single interface to lookup allows hiding the lookup lock rather 1225 * than acquiring it externally. 1226 * 2) Common interface for the inbound chunk handling/state machine. 1227 * 3) Common object handling routines for reference counting, etc. 1228 * 4) Disentangle association lookup from endpoint lookup, where we 1229 * do not have to find our endpoint to find our association. 1230 * 1231 */ 1232 1233 struct sctp_ep_common { 1234 /* Fields to help us manage our entries in the hash tables. */ 1235 struct hlist_node node; 1236 int hashent; 1237 1238 /* Runtime type information. What kind of endpoint is this? */ 1239 sctp_endpoint_type_t type; 1240 1241 /* Some fields to help us manage this object. 1242 * refcnt - Reference count access to this object. 1243 * dead - Do not attempt to use this object. 1244 * malloced - Do we need to kfree this object? 1245 */ 1246 atomic_t refcnt; 1247 char dead; 1248 char malloced; 1249 1250 /* What socket does this endpoint belong to? */ 1251 struct sock *sk; 1252 1253 /* This is where we receive inbound chunks. */ 1254 struct sctp_inq inqueue; 1255 1256 /* This substructure includes the defining parameters of the 1257 * endpoint: 1258 * bind_addr.port is our shared port number. 1259 * bind_addr.address_list is our set of local IP addresses. 1260 */ 1261 struct sctp_bind_addr bind_addr; 1262 }; 1263 1264 1265 /* RFC Section 1.4 Key Terms 1266 * 1267 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1268 * multi-homed host, an SCTP endpoint is represented to its peers as a 1269 * combination of a set of eligible destination transport addresses to 1270 * which SCTP packets can be sent and a set of eligible source 1271 * transport addresses from which SCTP packets can be received. 1272 * All transport addresses used by an SCTP endpoint must use the 1273 * same port number, but can use multiple IP addresses. A transport 1274 * address used by an SCTP endpoint must not be used by another 1275 * SCTP endpoint. In other words, a transport address is unique 1276 * to an SCTP endpoint. 1277 * 1278 * From an implementation perspective, each socket has one of these. 1279 * A TCP-style socket will have exactly one association on one of 1280 * these. An UDP-style socket will have multiple associations hanging 1281 * off one of these. 1282 */ 1283 1284 struct sctp_endpoint { 1285 /* Common substructure for endpoint and association. */ 1286 struct sctp_ep_common base; 1287 1288 /* Associations: A list of current associations and mappings 1289 * to the data consumers for each association. This 1290 * may be in the form of a hash table or other 1291 * implementation dependent structure. The data 1292 * consumers may be process identification 1293 * information such as file descriptors, named pipe 1294 * pointer, or table pointers dependent on how SCTP 1295 * is implemented. 1296 */ 1297 /* This is really a list of struct sctp_association entries. */ 1298 struct list_head asocs; 1299 1300 /* Secret Key: A secret key used by this endpoint to compute 1301 * the MAC. This SHOULD be a cryptographic quality 1302 * random number with a sufficient length. 1303 * Discussion in [RFC1750] can be helpful in 1304 * selection of the key. 1305 */ 1306 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1307 int current_key; 1308 int last_key; 1309 int key_changed_at; 1310 1311 /* digest: This is a digest of the sctp cookie. This field is 1312 * only used on the receive path when we try to validate 1313 * that the cookie has not been tampered with. We put 1314 * this here so we pre-allocate this once and can re-use 1315 * on every receive. 1316 */ 1317 __u8 *digest; 1318 1319 /* sendbuf acct. policy. */ 1320 __u32 sndbuf_policy; 1321 1322 /* rcvbuf acct. policy. */ 1323 __u32 rcvbuf_policy; 1324 1325 /* SCTP AUTH: array of the HMACs that will be allocated 1326 * we need this per association so that we don't serialize 1327 */ 1328 struct crypto_hash **auth_hmacs; 1329 1330 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1331 struct sctp_hmac_algo_param *auth_hmacs_list; 1332 1333 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1334 struct sctp_chunks_param *auth_chunk_list; 1335 1336 /* SCTP-AUTH: endpoint shared keys */ 1337 struct list_head endpoint_shared_keys; 1338 __u16 active_key_id; 1339 }; 1340 1341 /* Recover the outter endpoint structure. */ 1342 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1343 { 1344 struct sctp_endpoint *ep; 1345 1346 ep = container_of(base, struct sctp_endpoint, base); 1347 return ep; 1348 } 1349 1350 /* These are function signatures for manipulating endpoints. */ 1351 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1352 void sctp_endpoint_free(struct sctp_endpoint *); 1353 void sctp_endpoint_put(struct sctp_endpoint *); 1354 void sctp_endpoint_hold(struct sctp_endpoint *); 1355 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1356 struct sctp_association *sctp_endpoint_lookup_assoc( 1357 const struct sctp_endpoint *ep, 1358 const union sctp_addr *paddr, 1359 struct sctp_transport **); 1360 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1361 const union sctp_addr *); 1362 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1363 const union sctp_addr *); 1364 int sctp_has_association(const union sctp_addr *laddr, 1365 const union sctp_addr *paddr); 1366 1367 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1368 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1369 struct sctp_chunk **err_chunk); 1370 int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1371 const union sctp_addr *peer, 1372 sctp_init_chunk_t *init, gfp_t gfp); 1373 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1374 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1375 1376 struct sctp_inithdr_host { 1377 __u32 init_tag; 1378 __u32 a_rwnd; 1379 __u16 num_outbound_streams; 1380 __u16 num_inbound_streams; 1381 __u32 initial_tsn; 1382 }; 1383 1384 /* RFC2960 1385 * 1386 * 12. Recommended Transmission Control Block (TCB) Parameters 1387 * 1388 * This section details a recommended set of parameters that should 1389 * be contained within the TCB for an implementation. This section is 1390 * for illustrative purposes and should not be deemed as requirements 1391 * on an implementation or as an exhaustive list of all parameters 1392 * inside an SCTP TCB. Each implementation may need its own additional 1393 * parameters for optimization. 1394 */ 1395 1396 1397 /* Here we have information about each individual association. */ 1398 struct sctp_association { 1399 1400 /* A base structure common to endpoint and association. 1401 * In this context, it represents the associations's view 1402 * of the local endpoint of the association. 1403 */ 1404 struct sctp_ep_common base; 1405 1406 /* Associations on the same socket. */ 1407 struct list_head asocs; 1408 1409 /* association id. */ 1410 sctp_assoc_t assoc_id; 1411 1412 /* This is our parent endpoint. */ 1413 struct sctp_endpoint *ep; 1414 1415 /* These are those association elements needed in the cookie. */ 1416 struct sctp_cookie c; 1417 1418 /* This is all information about our peer. */ 1419 struct { 1420 /* rwnd 1421 * 1422 * Peer Rwnd : Current calculated value of the peer's rwnd. 1423 */ 1424 __u32 rwnd; 1425 1426 /* transport_addr_list 1427 * 1428 * Peer : A list of SCTP transport addresses that the 1429 * Transport : peer is bound to. This information is derived 1430 * Address : from the INIT or INIT ACK and is used to 1431 * List : associate an inbound packet with a given 1432 * : association. Normally this information is 1433 * : hashed or keyed for quick lookup and access 1434 * : of the TCB. 1435 * : The list is also initialized with the list 1436 * : of addresses passed with the sctp_connectx() 1437 * : call. 1438 * 1439 * It is a list of SCTP_transport's. 1440 */ 1441 struct list_head transport_addr_list; 1442 1443 /* transport_count 1444 * 1445 * Peer : A count of the number of peer addresses 1446 * Transport : in the Peer Transport Address List. 1447 * Address : 1448 * Count : 1449 */ 1450 __u16 transport_count; 1451 1452 /* port 1453 * The transport layer port number. 1454 */ 1455 __u16 port; 1456 1457 /* primary_path 1458 * 1459 * Primary : This is the current primary destination 1460 * Path : transport address of the peer endpoint. It 1461 * : may also specify a source transport address 1462 * : on this endpoint. 1463 * 1464 * All of these paths live on transport_addr_list. 1465 * 1466 * At the bakeoffs, we discovered that the intent of 1467 * primaryPath is that it only changes when the ULP 1468 * asks to have it changed. We add the activePath to 1469 * designate the connection we are currently using to 1470 * transmit new data and most control chunks. 1471 */ 1472 struct sctp_transport *primary_path; 1473 1474 /* Cache the primary path address here, when we 1475 * need a an address for msg_name. 1476 */ 1477 union sctp_addr primary_addr; 1478 1479 /* active_path 1480 * The path that we are currently using to 1481 * transmit new data and most control chunks. 1482 */ 1483 struct sctp_transport *active_path; 1484 1485 /* retran_path 1486 * 1487 * RFC2960 6.4 Multi-homed SCTP Endpoints 1488 * ... 1489 * Furthermore, when its peer is multi-homed, an 1490 * endpoint SHOULD try to retransmit a chunk to an 1491 * active destination transport address that is 1492 * different from the last destination address to 1493 * which the DATA chunk was sent. 1494 */ 1495 struct sctp_transport *retran_path; 1496 1497 /* Pointer to last transport I have sent on. */ 1498 struct sctp_transport *last_sent_to; 1499 1500 /* This is the last transport I have received DATA on. */ 1501 struct sctp_transport *last_data_from; 1502 1503 /* 1504 * Mapping An array of bits or bytes indicating which out of 1505 * Array order TSN's have been received (relative to the 1506 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1507 * order packets have been received, this array 1508 * will be set to all zero. This structure may be 1509 * in the form of a circular buffer or bit array. 1510 * 1511 * Last Rcvd : This is the last TSN received in 1512 * TSN : sequence. This value is set initially by 1513 * : taking the peer's Initial TSN, received in 1514 * : the INIT or INIT ACK chunk, and subtracting 1515 * : one from it. 1516 * 1517 * Throughout most of the specification this is called the 1518 * "Cumulative TSN ACK Point". In this case, we 1519 * ignore the advice in 12.2 in favour of the term 1520 * used in the bulk of the text. This value is hidden 1521 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1522 */ 1523 struct sctp_tsnmap tsn_map; 1524 __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; 1525 1526 /* Ack State : This flag indicates if the next received 1527 * : packet is to be responded to with a 1528 * : SACK. This is initializedto 0. When a packet 1529 * : is received it is incremented. If this value 1530 * : reaches 2 or more, a SACK is sent and the 1531 * : value is reset to 0. Note: This is used only 1532 * : when no DATA chunks are received out of 1533 * : order. When DATA chunks are out of order, 1534 * : SACK's are not delayed (see Section 6). 1535 */ 1536 __u8 sack_needed; /* Do we need to sack the peer? */ 1537 1538 /* These are capabilities which our peer advertised. */ 1539 __u8 ecn_capable; /* Can peer do ECN? */ 1540 __u8 ipv4_address; /* Peer understands IPv4 addresses? */ 1541 __u8 ipv6_address; /* Peer understands IPv6 addresses? */ 1542 __u8 hostname_address;/* Peer understands DNS addresses? */ 1543 __u8 asconf_capable; /* Does peer support ADDIP? */ 1544 __u8 prsctp_capable; /* Can peer do PR-SCTP? */ 1545 __u8 auth_capable; /* Is peer doing SCTP-AUTH? */ 1546 1547 __u32 adaptation_ind; /* Adaptation Code point. */ 1548 1549 /* This mask is used to disable sending the ASCONF chunk 1550 * with specified parameter to peer. 1551 */ 1552 __be16 addip_disabled_mask; 1553 1554 struct sctp_inithdr_host i; 1555 int cookie_len; 1556 void *cookie; 1557 1558 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1559 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1560 * Initial TSN Value minus 1 1561 */ 1562 __u32 addip_serial; 1563 1564 /* SCTP-AUTH: We need to know pears random number, hmac list 1565 * and authenticated chunk list. All that is part of the 1566 * cookie and these are just pointers to those locations 1567 */ 1568 sctp_random_param_t *peer_random; 1569 sctp_chunks_param_t *peer_chunks; 1570 sctp_hmac_algo_param_t *peer_hmacs; 1571 } peer; 1572 1573 /* State : A state variable indicating what state the 1574 * : association is in, i.e. COOKIE-WAIT, 1575 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1576 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1577 * 1578 * Note: No "CLOSED" state is illustrated since if a 1579 * association is "CLOSED" its TCB SHOULD be removed. 1580 * 1581 * In this implementation we DO have a CLOSED 1582 * state which is used during initiation and shutdown. 1583 * 1584 * State takes values from SCTP_STATE_*. 1585 */ 1586 sctp_state_t state; 1587 1588 /* The cookie life I award for any cookie. */ 1589 struct timeval cookie_life; 1590 1591 /* Overall : The overall association error count. 1592 * Error Count : [Clear this any time I get something.] 1593 */ 1594 int overall_error_count; 1595 1596 /* These are the association's initial, max, and min RTO values. 1597 * These values will be initialized by system defaults, but can 1598 * be modified via the SCTP_RTOINFO socket option. 1599 */ 1600 unsigned long rto_initial; 1601 unsigned long rto_max; 1602 unsigned long rto_min; 1603 1604 /* Maximum number of new data packets that can be sent in a burst. */ 1605 int max_burst; 1606 1607 /* This is the max_retrans value for the association. This value will 1608 * be initialized initialized from system defaults, but can be 1609 * modified by the SCTP_ASSOCINFO socket option. 1610 */ 1611 int max_retrans; 1612 1613 /* Maximum number of times the endpoint will retransmit INIT */ 1614 __u16 max_init_attempts; 1615 1616 /* How many times have we resent an INIT? */ 1617 __u16 init_retries; 1618 1619 /* The largest timeout or RTO value to use in attempting an INIT */ 1620 unsigned long max_init_timeo; 1621 1622 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1623 * the destination address every heartbeat interval. This value 1624 * will be inherited by all new transports. 1625 */ 1626 unsigned long hbinterval; 1627 1628 /* This is the max_retrans value for new transports in the 1629 * association. 1630 */ 1631 __u16 pathmaxrxt; 1632 1633 /* Flag that path mtu update is pending */ 1634 __u8 pmtu_pending; 1635 1636 /* Association : The smallest PMTU discovered for all of the 1637 * PMTU : peer's transport addresses. 1638 */ 1639 __u32 pathmtu; 1640 1641 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1642 __u32 param_flags; 1643 1644 /* SACK delay timeout */ 1645 unsigned long sackdelay; 1646 1647 1648 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1649 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1650 1651 /* Transport to which SHUTDOWN chunk was last sent. */ 1652 struct sctp_transport *shutdown_last_sent_to; 1653 1654 /* Transport to which INIT chunk was last sent. */ 1655 struct sctp_transport *init_last_sent_to; 1656 1657 /* Next TSN : The next TSN number to be assigned to a new 1658 * : DATA chunk. This is sent in the INIT or INIT 1659 * : ACK chunk to the peer and incremented each 1660 * : time a DATA chunk is assigned a TSN 1661 * : (normally just prior to transmit or during 1662 * : fragmentation). 1663 */ 1664 __u32 next_tsn; 1665 1666 /* 1667 * Last Rcvd : This is the last TSN received in sequence. This value 1668 * TSN : is set initially by taking the peer's Initial TSN, 1669 * : received in the INIT or INIT ACK chunk, and 1670 * : subtracting one from it. 1671 * 1672 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1673 */ 1674 1675 __u32 ctsn_ack_point; 1676 1677 /* PR-SCTP Advanced.Peer.Ack.Point */ 1678 __u32 adv_peer_ack_point; 1679 1680 /* Highest TSN that is acknowledged by incoming SACKs. */ 1681 __u32 highest_sacked; 1682 1683 /* The number of unacknowledged data chunks. Reported through 1684 * the SCTP_STATUS sockopt. 1685 */ 1686 __u16 unack_data; 1687 1688 /* This is the association's receive buffer space. This value is used 1689 * to set a_rwnd field in an INIT or a SACK chunk. 1690 */ 1691 __u32 rwnd; 1692 1693 /* This is the last advertised value of rwnd over a SACK chunk. */ 1694 __u32 a_rwnd; 1695 1696 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1697 * to slop over a maximum of the association's frag_point. 1698 */ 1699 __u32 rwnd_over; 1700 1701 /* This is the sndbuf size in use for the association. 1702 * This corresponds to the sndbuf size for the association, 1703 * as specified in the sk->sndbuf. 1704 */ 1705 int sndbuf_used; 1706 1707 /* This is the amount of memory that this association has allocated 1708 * in the receive path at any given time. 1709 */ 1710 atomic_t rmem_alloc; 1711 1712 /* This is the wait queue head for send requests waiting on 1713 * the association sndbuf space. 1714 */ 1715 wait_queue_head_t wait; 1716 1717 /* The message size at which SCTP fragmentation will occur. */ 1718 __u32 frag_point; 1719 1720 /* Counter used to count INIT errors. */ 1721 int init_err_counter; 1722 1723 /* Count the number of INIT cycles (for doubling timeout). */ 1724 int init_cycle; 1725 1726 /* Default send parameters. */ 1727 __u16 default_stream; 1728 __u16 default_flags; 1729 __u32 default_ppid; 1730 __u32 default_context; 1731 __u32 default_timetolive; 1732 1733 /* Default receive parameters */ 1734 __u32 default_rcv_context; 1735 1736 /* This tracks outbound ssn for a given stream. */ 1737 struct sctp_ssnmap *ssnmap; 1738 1739 /* All outbound chunks go through this structure. */ 1740 struct sctp_outq outqueue; 1741 1742 /* A smart pipe that will handle reordering and fragmentation, 1743 * as well as handle passing events up to the ULP. 1744 */ 1745 struct sctp_ulpq ulpq; 1746 1747 /* Last TSN that caused an ECNE Chunk to be sent. */ 1748 __u32 last_ecne_tsn; 1749 1750 /* Last TSN that caused a CWR Chunk to be sent. */ 1751 __u32 last_cwr_tsn; 1752 1753 /* How many duplicated TSNs have we seen? */ 1754 int numduptsns; 1755 1756 /* Number of seconds of idle time before an association is closed. 1757 * In the association context, this is really used as a boolean 1758 * since the real timeout is stored in the timeouts array 1759 */ 1760 __u32 autoclose; 1761 1762 /* These are to support 1763 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1764 * and Enforcement of Flow and Message Limits" 1765 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1766 * or "ADDIP" for short. 1767 */ 1768 1769 1770 1771 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1772 * 1773 * R1) One and only one ASCONF Chunk MAY be in transit and 1774 * unacknowledged at any one time. If a sender, after sending 1775 * an ASCONF chunk, decides it needs to transfer another 1776 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1777 * returns from the previous ASCONF Chunk before sending a 1778 * subsequent ASCONF. Note this restriction binds each side, 1779 * so at any time two ASCONF may be in-transit on any given 1780 * association (one sent from each endpoint). 1781 * 1782 * [This is our one-and-only-one ASCONF in flight. If we do 1783 * not have an ASCONF in flight, this is NULL.] 1784 */ 1785 struct sctp_chunk *addip_last_asconf; 1786 1787 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1788 * 1789 * IMPLEMENTATION NOTE: As an optimization a receiver may wish 1790 * to save the last ASCONF-ACK for some predetermined period 1791 * of time and instead of re-processing the ASCONF (with the 1792 * same serial number) it may just re-transmit the 1793 * ASCONF-ACK. It may wish to use the arrival of a new serial 1794 * number to discard the previously saved ASCONF-ACK or any 1795 * other means it may choose to expire the saved ASCONF-ACK. 1796 * 1797 * [This is our saved ASCONF-ACK. We invalidate it when a new 1798 * ASCONF serial number arrives.] 1799 */ 1800 struct sctp_chunk *addip_last_asconf_ack; 1801 1802 /* These ASCONF chunks are waiting to be sent. 1803 * 1804 * These chunaks can't be pushed to outqueue until receiving 1805 * ASCONF_ACK for the previous ASCONF indicated by 1806 * addip_last_asconf, so as to guarantee that only one ASCONF 1807 * is in flight at any time. 1808 * 1809 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1810 * 1811 * In defining the ASCONF Chunk transfer procedures, it is 1812 * essential that these transfers MUST NOT cause congestion 1813 * within the network. To achieve this, we place these 1814 * restrictions on the transfer of ASCONF Chunks: 1815 * 1816 * R1) One and only one ASCONF Chunk MAY be in transit and 1817 * unacknowledged at any one time. If a sender, after sending 1818 * an ASCONF chunk, decides it needs to transfer another 1819 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1820 * returns from the previous ASCONF Chunk before sending a 1821 * subsequent ASCONF. Note this restriction binds each side, 1822 * so at any time two ASCONF may be in-transit on any given 1823 * association (one sent from each endpoint). 1824 * 1825 * 1826 * [I really think this is EXACTLY the sort of intelligence 1827 * which already resides in sctp_outq. Please move this 1828 * queue and its supporting logic down there. --piggy] 1829 */ 1830 struct list_head addip_chunk_list; 1831 1832 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1833 * 1834 * A2) A serial number should be assigned to the Chunk. The 1835 * serial number SHOULD be a monotonically increasing 1836 * number. The serial number SHOULD be initialized at 1837 * the start of the association to the same value as the 1838 * Initial TSN and every time a new ASCONF chunk is created 1839 * it is incremented by one after assigning the serial number 1840 * to the newly created chunk. 1841 * 1842 * ADDIP 1843 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1844 * 1845 * Serial Number : 32 bits (unsigned integer) 1846 * 1847 * This value represents a Serial Number for the ASCONF 1848 * Chunk. The valid range of Serial Number is from 0 to 1849 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1850 * after reaching 4294967295. 1851 */ 1852 __u32 addip_serial; 1853 1854 /* SCTP AUTH: list of the endpoint shared keys. These 1855 * keys are provided out of band by the user applicaton 1856 * and can't change during the lifetime of the association 1857 */ 1858 struct list_head endpoint_shared_keys; 1859 1860 /* SCTP AUTH: 1861 * The current generated assocaition shared key (secret) 1862 */ 1863 struct sctp_auth_bytes *asoc_shared_key; 1864 1865 /* SCTP AUTH: hmac id of the first peer requested algorithm 1866 * that we support. 1867 */ 1868 __u16 default_hmac_id; 1869 1870 __u16 active_key_id; 1871 1872 /* Need to send an ECNE Chunk? */ 1873 char need_ecne; 1874 1875 /* Is it a temporary association? */ 1876 char temp; 1877 }; 1878 1879 1880 /* An eyecatcher for determining if we are really looking at an 1881 * association data structure. 1882 */ 1883 enum { 1884 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1885 }; 1886 1887 /* Recover the outter association structure. */ 1888 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1889 { 1890 struct sctp_association *asoc; 1891 1892 asoc = container_of(base, struct sctp_association, base); 1893 return asoc; 1894 } 1895 1896 /* These are function signatures for manipulating associations. */ 1897 1898 1899 struct sctp_association * 1900 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1901 sctp_scope_t scope, gfp_t gfp); 1902 void sctp_association_free(struct sctp_association *); 1903 void sctp_association_put(struct sctp_association *); 1904 void sctp_association_hold(struct sctp_association *); 1905 1906 struct sctp_transport *sctp_assoc_choose_init_transport( 1907 struct sctp_association *); 1908 struct sctp_transport *sctp_assoc_choose_shutdown_transport( 1909 struct sctp_association *); 1910 void sctp_assoc_update_retran_path(struct sctp_association *); 1911 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1912 const union sctp_addr *); 1913 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1914 const union sctp_addr *laddr); 1915 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1916 const union sctp_addr *address, 1917 const gfp_t gfp, 1918 const int peer_state); 1919 void sctp_assoc_del_peer(struct sctp_association *asoc, 1920 const union sctp_addr *addr); 1921 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1922 struct sctp_transport *peer); 1923 void sctp_assoc_control_transport(struct sctp_association *, 1924 struct sctp_transport *, 1925 sctp_transport_cmd_t, sctp_sn_error_t); 1926 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1927 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1928 const union sctp_addr *, 1929 const union sctp_addr *); 1930 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1931 void sctp_assoc_update(struct sctp_association *old, 1932 struct sctp_association *new); 1933 1934 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1935 1936 void sctp_assoc_sync_pmtu(struct sctp_association *); 1937 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1938 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1939 void sctp_assoc_set_primary(struct sctp_association *, 1940 struct sctp_transport *); 1941 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1942 gfp_t); 1943 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1944 struct sctp_cookie*, 1945 gfp_t gfp); 1946 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1947 1948 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1949 const union sctp_addr *ss2); 1950 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1951 1952 /* A convenience structure to parse out SCTP specific CMSGs. */ 1953 typedef struct sctp_cmsgs { 1954 struct sctp_initmsg *init; 1955 struct sctp_sndrcvinfo *info; 1956 } sctp_cmsgs_t; 1957 1958 /* Structure for tracking memory objects */ 1959 typedef struct { 1960 char *label; 1961 atomic_t *counter; 1962 } sctp_dbg_objcnt_entry_t; 1963 1964 #endif /* __sctp_structs_h__ */ 1965