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 __u32 sackfreq; 304 305 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 306 __u32 param_flags; 307 308 struct sctp_initmsg initmsg; 309 struct sctp_rtoinfo rtoinfo; 310 struct sctp_paddrparams paddrparam; 311 struct sctp_event_subscribe subscribe; 312 struct sctp_assocparams assocparams; 313 int user_frag; 314 __u32 autoclose; 315 __u8 nodelay; 316 __u8 disable_fragments; 317 __u8 v4mapped; 318 __u8 frag_interleave; 319 __u32 adaptation_ind; 320 __u32 pd_point; 321 322 atomic_t pd_mode; 323 /* Receive to here while partial delivery is in effect. */ 324 struct sk_buff_head pd_lobby; 325 }; 326 327 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 328 { 329 return (struct sctp_sock *)sk; 330 } 331 332 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 333 { 334 return (struct sock *)sp; 335 } 336 337 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 338 struct sctp6_sock { 339 struct sctp_sock sctp; 340 struct ipv6_pinfo inet6; 341 }; 342 #endif /* CONFIG_IPV6 */ 343 344 345 /* This is our APPLICATION-SPECIFIC state cookie. 346 * THIS IS NOT DICTATED BY THE SPECIFICATION. 347 */ 348 /* These are the parts of an association which we send in the cookie. 349 * Most of these are straight out of: 350 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 351 * 352 */ 353 354 struct sctp_cookie { 355 356 /* My : Tag expected in every inbound packet and sent 357 * Verification: in the INIT or INIT ACK chunk. 358 * Tag : 359 */ 360 __u32 my_vtag; 361 362 /* Peer's : Tag expected in every outbound packet except 363 * Verification: in the INIT chunk. 364 * Tag : 365 */ 366 __u32 peer_vtag; 367 368 /* The rest of these are not from the spec, but really need to 369 * be in the cookie. 370 */ 371 372 /* My Tie Tag : Assist in discovering a restarting association. */ 373 __u32 my_ttag; 374 375 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 376 __u32 peer_ttag; 377 378 /* When does this cookie expire? */ 379 struct timeval expiration; 380 381 /* Number of inbound/outbound streams which are set 382 * and negotiated during the INIT process. 383 */ 384 __u16 sinit_num_ostreams; 385 __u16 sinit_max_instreams; 386 387 /* This is the first sequence number I used. */ 388 __u32 initial_tsn; 389 390 /* This holds the originating address of the INIT packet. */ 391 union sctp_addr peer_addr; 392 393 /* IG Section 2.35.3 394 * Include the source port of the INIT-ACK 395 */ 396 __u16 my_port; 397 398 __u8 prsctp_capable; 399 400 /* Padding for future use */ 401 __u8 padding; 402 403 __u32 adaptation_ind; 404 405 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 406 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 407 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 408 409 /* This is a shim for my peer's INIT packet, followed by 410 * a copy of the raw address list of the association. 411 * The length of the raw address list is saved in the 412 * raw_addr_list_len field, which will be used at the time when 413 * the association TCB is re-constructed from the cookie. 414 */ 415 __u32 raw_addr_list_len; 416 struct sctp_init_chunk peer_init[0]; 417 }; 418 419 420 /* The format of our cookie that we send to our peer. */ 421 struct sctp_signed_cookie { 422 __u8 signature[SCTP_SECRET_SIZE]; 423 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 424 struct sctp_cookie c; 425 } __attribute__((packed)); 426 427 /* This is another convenience type to allocate memory for address 428 * params for the maximum size and pass such structures around 429 * internally. 430 */ 431 union sctp_addr_param { 432 struct sctp_paramhdr p; 433 struct sctp_ipv4addr_param v4; 434 struct sctp_ipv6addr_param v6; 435 }; 436 437 /* A convenience type to allow walking through the various 438 * parameters and avoid casting all over the place. 439 */ 440 union sctp_params { 441 void *v; 442 struct sctp_paramhdr *p; 443 struct sctp_cookie_preserve_param *life; 444 struct sctp_hostname_param *dns; 445 struct sctp_cookie_param *cookie; 446 struct sctp_supported_addrs_param *sat; 447 struct sctp_ipv4addr_param *v4; 448 struct sctp_ipv6addr_param *v6; 449 union sctp_addr_param *addr; 450 struct sctp_adaptation_ind_param *aind; 451 struct sctp_supported_ext_param *ext; 452 struct sctp_random_param *random; 453 struct sctp_chunks_param *chunks; 454 struct sctp_hmac_algo_param *hmac_algo; 455 struct sctp_addip_param *addip; 456 }; 457 458 /* RFC 2960. Section 3.3.5 Heartbeat. 459 * Heartbeat Information: variable length 460 * The Sender-specific Heartbeat Info field should normally include 461 * information about the sender's current time when this HEARTBEAT 462 * chunk is sent and the destination transport address to which this 463 * HEARTBEAT is sent (see Section 8.3). 464 */ 465 typedef struct sctp_sender_hb_info { 466 struct sctp_paramhdr param_hdr; 467 union sctp_addr daddr; 468 unsigned long sent_at; 469 __u64 hb_nonce; 470 } __attribute__((packed)) sctp_sender_hb_info_t; 471 472 /* 473 * RFC 2960 1.3.2 Sequenced Delivery within Streams 474 * 475 * The term "stream" is used in SCTP to refer to a sequence of user 476 * messages that are to be delivered to the upper-layer protocol in 477 * order with respect to other messages within the same stream. This is 478 * in contrast to its usage in TCP, where it refers to a sequence of 479 * bytes (in this document a byte is assumed to be eight bits). 480 * ... 481 * 482 * This is the structure we use to track both our outbound and inbound 483 * SSN, or Stream Sequence Numbers. 484 */ 485 486 struct sctp_stream { 487 __u16 *ssn; 488 unsigned int len; 489 }; 490 491 struct sctp_ssnmap { 492 struct sctp_stream in; 493 struct sctp_stream out; 494 int malloced; 495 }; 496 497 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 498 gfp_t gfp); 499 void sctp_ssnmap_free(struct sctp_ssnmap *map); 500 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 501 502 /* What is the current SSN number for this stream? */ 503 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 504 { 505 return stream->ssn[id]; 506 } 507 508 /* Return the next SSN number for this stream. */ 509 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 510 { 511 return stream->ssn[id]++; 512 } 513 514 /* Skip over this ssn and all below. */ 515 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 516 __u16 ssn) 517 { 518 stream->ssn[id] = ssn+1; 519 } 520 521 /* 522 * Pointers to address related SCTP functions. 523 * (i.e. things that depend on the address family.) 524 */ 525 struct sctp_af { 526 int (*sctp_xmit) (struct sk_buff *skb, 527 struct sctp_transport *, 528 int ipfragok); 529 int (*setsockopt) (struct sock *sk, 530 int level, 531 int optname, 532 char __user *optval, 533 int optlen); 534 int (*getsockopt) (struct sock *sk, 535 int level, 536 int optname, 537 char __user *optval, 538 int __user *optlen); 539 int (*compat_setsockopt) (struct sock *sk, 540 int level, 541 int optname, 542 char __user *optval, 543 int optlen); 544 int (*compat_getsockopt) (struct sock *sk, 545 int level, 546 int optname, 547 char __user *optval, 548 int __user *optlen); 549 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 550 union sctp_addr *daddr, 551 union sctp_addr *saddr); 552 void (*get_saddr) (struct sctp_sock *sk, 553 struct sctp_association *asoc, 554 struct dst_entry *dst, 555 union sctp_addr *daddr, 556 union sctp_addr *saddr); 557 void (*copy_addrlist) (struct list_head *, 558 struct net_device *); 559 void (*dst_saddr) (union sctp_addr *saddr, 560 struct dst_entry *dst, 561 __be16 port); 562 int (*cmp_addr) (const union sctp_addr *addr1, 563 const union sctp_addr *addr2); 564 void (*addr_copy) (union sctp_addr *dst, 565 union sctp_addr *src); 566 void (*from_skb) (union sctp_addr *, 567 struct sk_buff *skb, 568 int saddr); 569 void (*from_sk) (union sctp_addr *, 570 struct sock *sk); 571 void (*to_sk_saddr) (union sctp_addr *, 572 struct sock *sk); 573 void (*to_sk_daddr) (union sctp_addr *, 574 struct sock *sk); 575 void (*from_addr_param) (union sctp_addr *, 576 union sctp_addr_param *, 577 __be16 port, int iif); 578 int (*to_addr_param) (const union sctp_addr *, 579 union sctp_addr_param *); 580 int (*addr_valid) (union sctp_addr *, 581 struct sctp_sock *, 582 const struct sk_buff *); 583 sctp_scope_t (*scope) (union sctp_addr *); 584 void (*inaddr_any) (union sctp_addr *, __be16); 585 int (*is_any) (const union sctp_addr *); 586 int (*available) (union sctp_addr *, 587 struct sctp_sock *); 588 int (*skb_iif) (const struct sk_buff *sk); 589 int (*is_ce) (const struct sk_buff *sk); 590 void (*seq_dump_addr)(struct seq_file *seq, 591 union sctp_addr *addr); 592 void (*ecn_capable)(struct sock *sk); 593 __u16 net_header_len; 594 int sockaddr_len; 595 sa_family_t sa_family; 596 struct list_head list; 597 }; 598 599 struct sctp_af *sctp_get_af_specific(sa_family_t); 600 int sctp_register_af(struct sctp_af *); 601 602 /* Protocol family functions. */ 603 struct sctp_pf { 604 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 605 void (*skb_msgname) (struct sk_buff *, char *, int *); 606 int (*af_supported) (sa_family_t, struct sctp_sock *); 607 int (*cmp_addr) (const union sctp_addr *, 608 const union sctp_addr *, 609 struct sctp_sock *); 610 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 611 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 612 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 613 struct sock *(*create_accept_sk) (struct sock *sk, 614 struct sctp_association *asoc); 615 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 616 struct sctp_af *af; 617 }; 618 619 620 /* Structure to track chunk fragments that have been acked, but peer 621 * fragments of the same message have not. 622 */ 623 struct sctp_datamsg { 624 /* Chunks waiting to be submitted to lower layer. */ 625 struct list_head chunks; 626 /* Chunks that have been transmitted. */ 627 struct list_head track; 628 /* Reference counting. */ 629 atomic_t refcnt; 630 /* When is this message no longer interesting to the peer? */ 631 unsigned long expires_at; 632 /* Did the messenge fail to send? */ 633 int send_error; 634 char send_failed; 635 /* Control whether chunks from this message can be abandoned. */ 636 char can_abandon; 637 }; 638 639 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 640 struct sctp_sndrcvinfo *, 641 struct msghdr *, int len); 642 void sctp_datamsg_put(struct sctp_datamsg *); 643 void sctp_chunk_fail(struct sctp_chunk *, int error); 644 int sctp_chunk_abandoned(struct sctp_chunk *); 645 646 /* RFC2960 1.4 Key Terms 647 * 648 * o Chunk: A unit of information within an SCTP packet, consisting of 649 * a chunk header and chunk-specific content. 650 * 651 * As a matter of convenience, we remember the SCTP common header for 652 * each chunk as well as a few other header pointers... 653 */ 654 struct sctp_chunk { 655 struct list_head list; 656 657 atomic_t refcnt; 658 659 /* This is our link to the per-transport transmitted list. */ 660 struct list_head transmitted_list; 661 662 /* This field is used by chunks that hold fragmented data. 663 * For the first fragment this is the list that holds the rest of 664 * fragments. For the remaining fragments, this is the link to the 665 * frag_list maintained in the first fragment. 666 */ 667 struct list_head frag_list; 668 669 /* This points to the sk_buff containing the actual data. */ 670 struct sk_buff *skb; 671 672 /* These are the SCTP headers by reverse order in a packet. 673 * Note that some of these may happen more than once. In that 674 * case, we point at the "current" one, whatever that means 675 * for that level of header. 676 */ 677 678 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 679 union sctp_params param_hdr; 680 union { 681 __u8 *v; 682 struct sctp_datahdr *data_hdr; 683 struct sctp_inithdr *init_hdr; 684 struct sctp_sackhdr *sack_hdr; 685 struct sctp_heartbeathdr *hb_hdr; 686 struct sctp_sender_hb_info *hbs_hdr; 687 struct sctp_shutdownhdr *shutdown_hdr; 688 struct sctp_signed_cookie *cookie_hdr; 689 struct sctp_ecnehdr *ecne_hdr; 690 struct sctp_cwrhdr *ecn_cwr_hdr; 691 struct sctp_errhdr *err_hdr; 692 struct sctp_addiphdr *addip_hdr; 693 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 694 struct sctp_authhdr *auth_hdr; 695 } subh; 696 697 __u8 *chunk_end; 698 699 struct sctp_chunkhdr *chunk_hdr; 700 struct sctphdr *sctp_hdr; 701 702 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 703 struct sctp_sndrcvinfo sinfo; 704 705 /* Which association does this belong to? */ 706 struct sctp_association *asoc; 707 708 /* What endpoint received this chunk? */ 709 struct sctp_ep_common *rcvr; 710 711 /* We fill this in if we are calculating RTT. */ 712 unsigned long sent_at; 713 714 /* What is the origin IP address for this chunk? */ 715 union sctp_addr source; 716 /* Destination address for this chunk. */ 717 union sctp_addr dest; 718 719 /* For outbound message, track all fragments for SEND_FAILED. */ 720 struct sctp_datamsg *msg; 721 722 /* For an inbound chunk, this tells us where it came from. 723 * For an outbound chunk, it tells us where we'd like it to 724 * go. It is NULL if we have no preference. 725 */ 726 struct sctp_transport *transport; 727 728 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 729 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 730 * spec violates the principle premis that all chunks are processed 731 * in order. 732 */ 733 struct sk_buff *auth_chunk; 734 735 __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ 736 __u8 resent; /* Has this chunk ever been retransmitted. */ 737 __u8 has_tsn; /* Does this chunk have a TSN yet? */ 738 __u8 has_ssn; /* Does this chunk have a SSN yet? */ 739 __u8 singleton; /* Was this the only chunk in the packet? */ 740 __u8 end_of_packet; /* Was this the last chunk in the packet? */ 741 __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ 742 __u8 pdiscard; /* Discard the whole packet now? */ 743 __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ 744 __s8 fast_retransmit; /* Is this chunk fast retransmitted? */ 745 __u8 tsn_missing_report; /* Data chunk missing counter. */ 746 __u8 data_accepted; /* At least 1 chunk in this packet accepted */ 747 __u8 auth; /* IN: was auth'ed | OUT: needs auth */ 748 __u8 has_asconf; /* IN: have seen an asconf before */ 749 }; 750 751 void sctp_chunk_hold(struct sctp_chunk *); 752 void sctp_chunk_put(struct sctp_chunk *); 753 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 754 struct iovec *data); 755 void sctp_chunk_free(struct sctp_chunk *); 756 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 757 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 758 const struct sctp_association *, 759 struct sock *); 760 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 761 union sctp_addr *); 762 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 763 764 enum { 765 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 766 SCTP_ADDR_SRC, /* address can be used as source */ 767 SCTP_ADDR_DEL, /* address about to be deleted */ 768 }; 769 770 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 771 struct sctp_sockaddr_entry { 772 struct list_head list; 773 struct rcu_head rcu; 774 union sctp_addr a; 775 __u8 state; 776 __u8 valid; 777 }; 778 779 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 780 781 /* This structure holds lists of chunks as we are assembling for 782 * transmission. 783 */ 784 struct sctp_packet { 785 /* These are the SCTP header values (host order) for the packet. */ 786 __u16 source_port; 787 __u16 destination_port; 788 __u32 vtag; 789 790 /* This contains the payload chunks. */ 791 struct list_head chunk_list; 792 793 /* This is the overhead of the sctp and ip headers. */ 794 size_t overhead; 795 /* This is the total size of all chunks INCLUDING padding. */ 796 size_t size; 797 798 /* The packet is destined for this transport address. 799 * The function we finally use to pass down to the next lower 800 * layer lives in the transport structure. 801 */ 802 struct sctp_transport *transport; 803 804 /* pointer to the auth chunk for this packet */ 805 struct sctp_chunk *auth; 806 807 /* This packet contains a COOKIE-ECHO chunk. */ 808 __u8 has_cookie_echo; 809 810 /* This packet contains a SACK chunk. */ 811 __u8 has_sack; 812 813 /* This packet contains an AUTH chunk */ 814 __u8 has_auth; 815 816 /* This packet contains at least 1 DATA chunk */ 817 __u8 has_data; 818 819 /* SCTP cannot fragment this packet. So let ip fragment it. */ 820 __u8 ipfragok; 821 822 __u8 malloced; 823 }; 824 825 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 826 struct sctp_transport *, 827 __u16 sport, __u16 dport); 828 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 829 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 830 struct sctp_chunk *, int); 831 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 832 struct sctp_chunk *); 833 int sctp_packet_transmit(struct sctp_packet *); 834 void sctp_packet_free(struct sctp_packet *); 835 836 static inline int sctp_packet_empty(struct sctp_packet *packet) 837 { 838 return (packet->size == packet->overhead); 839 } 840 841 /* This represents a remote transport address. 842 * For local transport addresses, we just use union sctp_addr. 843 * 844 * RFC2960 Section 1.4 Key Terms 845 * 846 * o Transport address: A Transport Address is traditionally defined 847 * by Network Layer address, Transport Layer protocol and Transport 848 * Layer port number. In the case of SCTP running over IP, a 849 * transport address is defined by the combination of an IP address 850 * and an SCTP port number (where SCTP is the Transport protocol). 851 * 852 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 853 * 854 * o The sender keeps a separate congestion control parameter set for 855 * each of the destination addresses it can send to (not each 856 * source-destination pair but for each destination). The parameters 857 * should decay if the address is not used for a long enough time 858 * period. 859 * 860 */ 861 struct sctp_transport { 862 /* A list of transports. */ 863 struct list_head transports; 864 865 /* Reference counting. */ 866 atomic_t refcnt; 867 int dead; 868 869 /* This is the peer's IP address and port. */ 870 union sctp_addr ipaddr; 871 872 /* These are the functions we call to handle LLP stuff. */ 873 struct sctp_af *af_specific; 874 875 /* Which association do we belong to? */ 876 struct sctp_association *asoc; 877 878 /* RFC2960 879 * 880 * 12.3 Per Transport Address Data 881 * 882 * For each destination transport address in the peer's 883 * address list derived from the INIT or INIT ACK chunk, a 884 * number of data elements needs to be maintained including: 885 */ 886 /* RTO : The current retransmission timeout value. */ 887 unsigned long rto; 888 unsigned long last_rto; 889 890 __u32 rtt; /* This is the most recent RTT. */ 891 892 /* RTTVAR : The current RTT variation. */ 893 __u32 rttvar; 894 895 /* SRTT : The current smoothed round trip time. */ 896 __u32 srtt; 897 898 /* RTO-Pending : A flag used to track if one of the DATA 899 * chunks sent to this address is currently being 900 * used to compute a RTT. If this flag is 0, 901 * the next DATA chunk sent to this destination 902 * should be used to compute a RTT and this flag 903 * should be set. Every time the RTT 904 * calculation completes (i.e. the DATA chunk 905 * is SACK'd) clear this flag. 906 */ 907 __u8 rto_pending; 908 909 /* Flag to track the current fast recovery state */ 910 __u8 fast_recovery; 911 912 /* 913 * These are the congestion stats. 914 */ 915 /* cwnd : The current congestion window. */ 916 __u32 cwnd; /* This is the actual cwnd. */ 917 918 /* ssthresh : The current slow start threshold value. */ 919 __u32 ssthresh; 920 921 /* partial : The tracking method for increase of cwnd when in 922 * bytes acked : congestion avoidance mode (see Section 6.2.2) 923 */ 924 __u32 partial_bytes_acked; 925 926 /* Data that has been sent, but not acknowledged. */ 927 __u32 flight_size; 928 929 /* TSN marking the fast recovery exit point */ 930 __u32 fast_recovery_exit; 931 932 /* Destination */ 933 struct dst_entry *dst; 934 /* Source address. */ 935 union sctp_addr saddr; 936 937 /* When was the last time(in jiffies) that a data packet was sent on 938 * this transport? This is used to adjust the cwnd when the transport 939 * becomes inactive. 940 */ 941 unsigned long last_time_used; 942 943 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 944 * the destination address every heartbeat interval. 945 */ 946 unsigned long hbinterval; 947 948 /* SACK delay timeout */ 949 unsigned long sackdelay; 950 __u32 sackfreq; 951 952 /* When was the last time (in jiffies) that we heard from this 953 * transport? We use this to pick new active and retran paths. 954 */ 955 unsigned long last_time_heard; 956 957 /* Last time(in jiffies) when cwnd is reduced due to the congestion 958 * indication based on ECNE chunk. 959 */ 960 unsigned long last_time_ecne_reduced; 961 962 /* This is the max_retrans value for the transport and will 963 * be initialized from the assocs value. This can be changed 964 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 965 */ 966 __u16 pathmaxrxt; 967 968 /* is the Path MTU update pending on this tranport */ 969 __u8 pmtu_pending; 970 971 /* PMTU : The current known path MTU. */ 972 __u32 pathmtu; 973 974 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 975 __u32 param_flags; 976 977 /* The number of times INIT has been sent on this transport. */ 978 int init_sent_count; 979 980 /* state : The current state of this destination, 981 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. 982 */ 983 int state; 984 985 /* These are the error stats for this destination. */ 986 987 /* Error count : The current error count for this destination. */ 988 unsigned short error_count; 989 990 /* Per : A timer used by each destination. 991 * Destination : 992 * Timer : 993 * 994 * [Everywhere else in the text this is called T3-rtx. -ed] 995 */ 996 struct timer_list T3_rtx_timer; 997 998 /* Heartbeat timer is per destination. */ 999 struct timer_list hb_timer; 1000 1001 /* Since we're using per-destination retransmission timers 1002 * (see above), we're also using per-destination "transmitted" 1003 * queues. This probably ought to be a private struct 1004 * accessible only within the outqueue, but it's not, yet. 1005 */ 1006 struct list_head transmitted; 1007 1008 /* We build bundle-able packets for this transport here. */ 1009 struct sctp_packet packet; 1010 1011 /* This is the list of transports that have chunks to send. */ 1012 struct list_head send_ready; 1013 1014 int malloced; /* Is this structure kfree()able? */ 1015 1016 /* State information saved for SFR_CACC algorithm. The key 1017 * idea in SFR_CACC is to maintain state at the sender on a 1018 * per-destination basis when a changeover happens. 1019 * char changeover_active; 1020 * char cycling_changeover; 1021 * __u32 next_tsn_at_change; 1022 * char cacc_saw_newack; 1023 */ 1024 struct { 1025 /* An unsigned integer, which stores the next TSN to be 1026 * used by the sender, at the moment of changeover. 1027 */ 1028 __u32 next_tsn_at_change; 1029 1030 /* A flag which indicates the occurrence of a changeover */ 1031 char changeover_active; 1032 1033 /* A flag which indicates whether the change of primary is 1034 * the first switch to this destination address during an 1035 * active switch. 1036 */ 1037 char cycling_changeover; 1038 1039 /* A temporary flag, which is used during the processing of 1040 * a SACK to estimate the causative TSN(s)'s group. 1041 */ 1042 char cacc_saw_newack; 1043 } cacc; 1044 1045 /* 64-bit random number sent with heartbeat. */ 1046 __u64 hb_nonce; 1047 }; 1048 1049 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1050 gfp_t); 1051 void sctp_transport_set_owner(struct sctp_transport *, 1052 struct sctp_association *); 1053 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1054 struct sctp_sock *); 1055 void sctp_transport_pmtu(struct sctp_transport *); 1056 void sctp_transport_free(struct sctp_transport *); 1057 void sctp_transport_reset_timers(struct sctp_transport *, int); 1058 void sctp_transport_hold(struct sctp_transport *); 1059 void sctp_transport_put(struct sctp_transport *); 1060 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1061 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1062 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1063 unsigned long sctp_transport_timeout(struct sctp_transport *); 1064 void sctp_transport_reset(struct sctp_transport *); 1065 void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1066 1067 1068 /* This is the structure we use to queue packets as they come into 1069 * SCTP. We write packets to it and read chunks from it. 1070 */ 1071 struct sctp_inq { 1072 /* This is actually a queue of sctp_chunk each 1073 * containing a partially decoded packet. 1074 */ 1075 struct list_head in_chunk_list; 1076 /* This is the packet which is currently off the in queue and is 1077 * being worked on through the inbound chunk processing. 1078 */ 1079 struct sctp_chunk *in_progress; 1080 1081 /* This is the delayed task to finish delivering inbound 1082 * messages. 1083 */ 1084 struct work_struct immediate; 1085 1086 int malloced; /* Is this structure kfree()able? */ 1087 }; 1088 1089 void sctp_inq_init(struct sctp_inq *); 1090 void sctp_inq_free(struct sctp_inq *); 1091 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1092 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1093 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1094 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1095 1096 /* This is the structure we use to hold outbound chunks. You push 1097 * chunks in and they automatically pop out the other end as bundled 1098 * packets (it calls (*output_handler)()). 1099 * 1100 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1101 * and 8.2 of the v13 draft. 1102 * 1103 * It handles retransmissions. The connection to the timeout portion 1104 * of the state machine is through sctp_..._timeout() and timeout_handler. 1105 * 1106 * If you feed it SACKs, it will eat them. 1107 * 1108 * If you give it big chunks, it will fragment them. 1109 * 1110 * It assigns TSN's to data chunks. This happens at the last possible 1111 * instant before transmission. 1112 * 1113 * When free()'d, it empties itself out via output_handler(). 1114 */ 1115 struct sctp_outq { 1116 struct sctp_association *asoc; 1117 1118 /* Data pending that has never been transmitted. */ 1119 struct list_head out_chunk_list; 1120 1121 unsigned out_qlen; /* Total length of queued data chunks. */ 1122 1123 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1124 unsigned error; 1125 1126 /* These are control chunks we want to send. */ 1127 struct list_head control_chunk_list; 1128 1129 /* These are chunks that have been sacked but are above the 1130 * CTSN, or cumulative tsn ack point. 1131 */ 1132 struct list_head sacked; 1133 1134 /* Put chunks on this list to schedule them for 1135 * retransmission. 1136 */ 1137 struct list_head retransmit; 1138 1139 /* Put chunks on this list to save them for FWD TSN processing as 1140 * they were abandoned. 1141 */ 1142 struct list_head abandoned; 1143 1144 /* How many unackd bytes do we have in-flight? */ 1145 __u32 outstanding_bytes; 1146 1147 /* Are we doing fast-rtx on this queue */ 1148 char fast_rtx; 1149 1150 /* Corked? */ 1151 char cork; 1152 1153 /* Is this structure empty? */ 1154 char empty; 1155 1156 /* Are we kfree()able? */ 1157 char malloced; 1158 }; 1159 1160 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1161 void sctp_outq_teardown(struct sctp_outq *); 1162 void sctp_outq_free(struct sctp_outq*); 1163 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1164 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1165 int sctp_outq_is_empty(const struct sctp_outq *); 1166 void sctp_outq_restart(struct sctp_outq *); 1167 1168 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1169 sctp_retransmit_reason_t); 1170 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1171 int sctp_outq_uncork(struct sctp_outq *); 1172 /* Uncork and flush an outqueue. */ 1173 static inline void sctp_outq_cork(struct sctp_outq *q) 1174 { 1175 q->cork = 1; 1176 } 1177 1178 /* These bind address data fields common between endpoints and associations */ 1179 struct sctp_bind_addr { 1180 1181 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1182 * 1183 * SCTP Port: The local SCTP port number the endpoint is 1184 * bound to. 1185 */ 1186 __u16 port; 1187 1188 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1189 * 1190 * Address List: The list of IP addresses that this instance 1191 * has bound. This information is passed to one's 1192 * peer(s) in INIT and INIT ACK chunks. 1193 */ 1194 struct list_head address_list; 1195 1196 int malloced; /* Are we kfree()able? */ 1197 }; 1198 1199 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1200 void sctp_bind_addr_free(struct sctp_bind_addr *); 1201 int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1202 const struct sctp_bind_addr *src, 1203 sctp_scope_t scope, gfp_t gfp, 1204 int flags); 1205 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1206 const struct sctp_bind_addr *src, 1207 gfp_t gfp); 1208 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1209 __u8 addr_state, gfp_t gfp); 1210 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1211 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1212 struct sctp_sock *); 1213 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1214 struct sctp_sock *, struct sctp_sock *); 1215 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1216 const union sctp_addr *addr); 1217 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1218 const union sctp_addr *addrs, 1219 int addrcnt, 1220 struct sctp_sock *opt); 1221 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1222 int *addrs_len, 1223 gfp_t gfp); 1224 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1225 __u16 port, gfp_t gfp); 1226 1227 sctp_scope_t sctp_scope(const union sctp_addr *); 1228 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1229 int sctp_is_any(const union sctp_addr *addr); 1230 int sctp_addr_is_valid(const union sctp_addr *addr); 1231 1232 1233 /* What type of endpoint? */ 1234 typedef enum { 1235 SCTP_EP_TYPE_SOCKET, 1236 SCTP_EP_TYPE_ASSOCIATION, 1237 } sctp_endpoint_type_t; 1238 1239 /* 1240 * A common base class to bridge the implmentation view of a 1241 * socket (usually listening) endpoint versus an association's 1242 * local endpoint. 1243 * This common structure is useful for several purposes: 1244 * 1) Common interface for lookup routines. 1245 * a) Subfunctions work for either endpoint or association 1246 * b) Single interface to lookup allows hiding the lookup lock rather 1247 * than acquiring it externally. 1248 * 2) Common interface for the inbound chunk handling/state machine. 1249 * 3) Common object handling routines for reference counting, etc. 1250 * 4) Disentangle association lookup from endpoint lookup, where we 1251 * do not have to find our endpoint to find our association. 1252 * 1253 */ 1254 1255 struct sctp_ep_common { 1256 /* Fields to help us manage our entries in the hash tables. */ 1257 struct hlist_node node; 1258 int hashent; 1259 1260 /* Runtime type information. What kind of endpoint is this? */ 1261 sctp_endpoint_type_t type; 1262 1263 /* Some fields to help us manage this object. 1264 * refcnt - Reference count access to this object. 1265 * dead - Do not attempt to use this object. 1266 * malloced - Do we need to kfree this object? 1267 */ 1268 atomic_t refcnt; 1269 char dead; 1270 char malloced; 1271 1272 /* What socket does this endpoint belong to? */ 1273 struct sock *sk; 1274 1275 /* This is where we receive inbound chunks. */ 1276 struct sctp_inq inqueue; 1277 1278 /* This substructure includes the defining parameters of the 1279 * endpoint: 1280 * bind_addr.port is our shared port number. 1281 * bind_addr.address_list is our set of local IP addresses. 1282 */ 1283 struct sctp_bind_addr bind_addr; 1284 }; 1285 1286 1287 /* RFC Section 1.4 Key Terms 1288 * 1289 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1290 * multi-homed host, an SCTP endpoint is represented to its peers as a 1291 * combination of a set of eligible destination transport addresses to 1292 * which SCTP packets can be sent and a set of eligible source 1293 * transport addresses from which SCTP packets can be received. 1294 * All transport addresses used by an SCTP endpoint must use the 1295 * same port number, but can use multiple IP addresses. A transport 1296 * address used by an SCTP endpoint must not be used by another 1297 * SCTP endpoint. In other words, a transport address is unique 1298 * to an SCTP endpoint. 1299 * 1300 * From an implementation perspective, each socket has one of these. 1301 * A TCP-style socket will have exactly one association on one of 1302 * these. An UDP-style socket will have multiple associations hanging 1303 * off one of these. 1304 */ 1305 1306 struct sctp_endpoint { 1307 /* Common substructure for endpoint and association. */ 1308 struct sctp_ep_common base; 1309 1310 /* Associations: A list of current associations and mappings 1311 * to the data consumers for each association. This 1312 * may be in the form of a hash table or other 1313 * implementation dependent structure. The data 1314 * consumers may be process identification 1315 * information such as file descriptors, named pipe 1316 * pointer, or table pointers dependent on how SCTP 1317 * is implemented. 1318 */ 1319 /* This is really a list of struct sctp_association entries. */ 1320 struct list_head asocs; 1321 1322 /* Secret Key: A secret key used by this endpoint to compute 1323 * the MAC. This SHOULD be a cryptographic quality 1324 * random number with a sufficient length. 1325 * Discussion in [RFC1750] can be helpful in 1326 * selection of the key. 1327 */ 1328 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1329 int current_key; 1330 int last_key; 1331 int key_changed_at; 1332 1333 /* digest: This is a digest of the sctp cookie. This field is 1334 * only used on the receive path when we try to validate 1335 * that the cookie has not been tampered with. We put 1336 * this here so we pre-allocate this once and can re-use 1337 * on every receive. 1338 */ 1339 __u8 *digest; 1340 1341 /* sendbuf acct. policy. */ 1342 __u32 sndbuf_policy; 1343 1344 /* rcvbuf acct. policy. */ 1345 __u32 rcvbuf_policy; 1346 1347 /* SCTP AUTH: array of the HMACs that will be allocated 1348 * we need this per association so that we don't serialize 1349 */ 1350 struct crypto_hash **auth_hmacs; 1351 1352 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1353 struct sctp_hmac_algo_param *auth_hmacs_list; 1354 1355 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1356 struct sctp_chunks_param *auth_chunk_list; 1357 1358 /* SCTP-AUTH: endpoint shared keys */ 1359 struct list_head endpoint_shared_keys; 1360 __u16 active_key_id; 1361 }; 1362 1363 /* Recover the outter endpoint structure. */ 1364 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1365 { 1366 struct sctp_endpoint *ep; 1367 1368 ep = container_of(base, struct sctp_endpoint, base); 1369 return ep; 1370 } 1371 1372 /* These are function signatures for manipulating endpoints. */ 1373 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1374 void sctp_endpoint_free(struct sctp_endpoint *); 1375 void sctp_endpoint_put(struct sctp_endpoint *); 1376 void sctp_endpoint_hold(struct sctp_endpoint *); 1377 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1378 struct sctp_association *sctp_endpoint_lookup_assoc( 1379 const struct sctp_endpoint *ep, 1380 const union sctp_addr *paddr, 1381 struct sctp_transport **); 1382 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1383 const union sctp_addr *); 1384 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1385 const union sctp_addr *); 1386 int sctp_has_association(const union sctp_addr *laddr, 1387 const union sctp_addr *paddr); 1388 1389 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1390 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1391 struct sctp_chunk **err_chunk); 1392 int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1393 const union sctp_addr *peer, 1394 sctp_init_chunk_t *init, gfp_t gfp); 1395 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1396 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1397 1398 struct sctp_inithdr_host { 1399 __u32 init_tag; 1400 __u32 a_rwnd; 1401 __u16 num_outbound_streams; 1402 __u16 num_inbound_streams; 1403 __u32 initial_tsn; 1404 }; 1405 1406 /* RFC2960 1407 * 1408 * 12. Recommended Transmission Control Block (TCB) Parameters 1409 * 1410 * This section details a recommended set of parameters that should 1411 * be contained within the TCB for an implementation. This section is 1412 * for illustrative purposes and should not be deemed as requirements 1413 * on an implementation or as an exhaustive list of all parameters 1414 * inside an SCTP TCB. Each implementation may need its own additional 1415 * parameters for optimization. 1416 */ 1417 1418 1419 /* Here we have information about each individual association. */ 1420 struct sctp_association { 1421 1422 /* A base structure common to endpoint and association. 1423 * In this context, it represents the associations's view 1424 * of the local endpoint of the association. 1425 */ 1426 struct sctp_ep_common base; 1427 1428 /* Associations on the same socket. */ 1429 struct list_head asocs; 1430 1431 /* association id. */ 1432 sctp_assoc_t assoc_id; 1433 1434 /* This is our parent endpoint. */ 1435 struct sctp_endpoint *ep; 1436 1437 /* These are those association elements needed in the cookie. */ 1438 struct sctp_cookie c; 1439 1440 /* This is all information about our peer. */ 1441 struct { 1442 /* rwnd 1443 * 1444 * Peer Rwnd : Current calculated value of the peer's rwnd. 1445 */ 1446 __u32 rwnd; 1447 1448 /* transport_addr_list 1449 * 1450 * Peer : A list of SCTP transport addresses that the 1451 * Transport : peer is bound to. This information is derived 1452 * Address : from the INIT or INIT ACK and is used to 1453 * List : associate an inbound packet with a given 1454 * : association. Normally this information is 1455 * : hashed or keyed for quick lookup and access 1456 * : of the TCB. 1457 * : The list is also initialized with the list 1458 * : of addresses passed with the sctp_connectx() 1459 * : call. 1460 * 1461 * It is a list of SCTP_transport's. 1462 */ 1463 struct list_head transport_addr_list; 1464 1465 /* transport_count 1466 * 1467 * Peer : A count of the number of peer addresses 1468 * Transport : in the Peer Transport Address List. 1469 * Address : 1470 * Count : 1471 */ 1472 __u16 transport_count; 1473 1474 /* port 1475 * The transport layer port number. 1476 */ 1477 __u16 port; 1478 1479 /* primary_path 1480 * 1481 * Primary : This is the current primary destination 1482 * Path : transport address of the peer endpoint. It 1483 * : may also specify a source transport address 1484 * : on this endpoint. 1485 * 1486 * All of these paths live on transport_addr_list. 1487 * 1488 * At the bakeoffs, we discovered that the intent of 1489 * primaryPath is that it only changes when the ULP 1490 * asks to have it changed. We add the activePath to 1491 * designate the connection we are currently using to 1492 * transmit new data and most control chunks. 1493 */ 1494 struct sctp_transport *primary_path; 1495 1496 /* Cache the primary path address here, when we 1497 * need a an address for msg_name. 1498 */ 1499 union sctp_addr primary_addr; 1500 1501 /* active_path 1502 * The path that we are currently using to 1503 * transmit new data and most control chunks. 1504 */ 1505 struct sctp_transport *active_path; 1506 1507 /* retran_path 1508 * 1509 * RFC2960 6.4 Multi-homed SCTP Endpoints 1510 * ... 1511 * Furthermore, when its peer is multi-homed, an 1512 * endpoint SHOULD try to retransmit a chunk to an 1513 * active destination transport address that is 1514 * different from the last destination address to 1515 * which the DATA chunk was sent. 1516 */ 1517 struct sctp_transport *retran_path; 1518 1519 /* Pointer to last transport I have sent on. */ 1520 struct sctp_transport *last_sent_to; 1521 1522 /* This is the last transport I have received DATA on. */ 1523 struct sctp_transport *last_data_from; 1524 1525 /* 1526 * Mapping An array of bits or bytes indicating which out of 1527 * Array order TSN's have been received (relative to the 1528 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1529 * order packets have been received, this array 1530 * will be set to all zero. This structure may be 1531 * in the form of a circular buffer or bit array. 1532 * 1533 * Last Rcvd : This is the last TSN received in 1534 * TSN : sequence. This value is set initially by 1535 * : taking the peer's Initial TSN, received in 1536 * : the INIT or INIT ACK chunk, and subtracting 1537 * : one from it. 1538 * 1539 * Throughout most of the specification this is called the 1540 * "Cumulative TSN ACK Point". In this case, we 1541 * ignore the advice in 12.2 in favour of the term 1542 * used in the bulk of the text. This value is hidden 1543 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1544 */ 1545 struct sctp_tsnmap tsn_map; 1546 __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; 1547 1548 /* Ack State : This flag indicates if the next received 1549 * : packet is to be responded to with a 1550 * : SACK. This is initializedto 0. When a packet 1551 * : is received it is incremented. If this value 1552 * : reaches 2 or more, a SACK is sent and the 1553 * : value is reset to 0. Note: This is used only 1554 * : when no DATA chunks are received out of 1555 * : order. When DATA chunks are out of order, 1556 * : SACK's are not delayed (see Section 6). 1557 */ 1558 __u8 sack_needed; /* Do we need to sack the peer? */ 1559 __u32 sack_cnt; 1560 1561 /* These are capabilities which our peer advertised. */ 1562 __u8 ecn_capable; /* Can peer do ECN? */ 1563 __u8 ipv4_address; /* Peer understands IPv4 addresses? */ 1564 __u8 ipv6_address; /* Peer understands IPv6 addresses? */ 1565 __u8 hostname_address;/* Peer understands DNS addresses? */ 1566 __u8 asconf_capable; /* Does peer support ADDIP? */ 1567 __u8 prsctp_capable; /* Can peer do PR-SCTP? */ 1568 __u8 auth_capable; /* Is peer doing SCTP-AUTH? */ 1569 1570 __u32 adaptation_ind; /* Adaptation Code point. */ 1571 1572 /* This mask is used to disable sending the ASCONF chunk 1573 * with specified parameter to peer. 1574 */ 1575 __be16 addip_disabled_mask; 1576 1577 struct sctp_inithdr_host i; 1578 int cookie_len; 1579 void *cookie; 1580 1581 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1582 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1583 * Initial TSN Value minus 1 1584 */ 1585 __u32 addip_serial; 1586 1587 /* SCTP-AUTH: We need to know pears random number, hmac list 1588 * and authenticated chunk list. All that is part of the 1589 * cookie and these are just pointers to those locations 1590 */ 1591 sctp_random_param_t *peer_random; 1592 sctp_chunks_param_t *peer_chunks; 1593 sctp_hmac_algo_param_t *peer_hmacs; 1594 } peer; 1595 1596 /* State : A state variable indicating what state the 1597 * : association is in, i.e. COOKIE-WAIT, 1598 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1599 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1600 * 1601 * Note: No "CLOSED" state is illustrated since if a 1602 * association is "CLOSED" its TCB SHOULD be removed. 1603 * 1604 * In this implementation we DO have a CLOSED 1605 * state which is used during initiation and shutdown. 1606 * 1607 * State takes values from SCTP_STATE_*. 1608 */ 1609 sctp_state_t state; 1610 1611 /* The cookie life I award for any cookie. */ 1612 struct timeval cookie_life; 1613 1614 /* Overall : The overall association error count. 1615 * Error Count : [Clear this any time I get something.] 1616 */ 1617 int overall_error_count; 1618 1619 /* These are the association's initial, max, and min RTO values. 1620 * These values will be initialized by system defaults, but can 1621 * be modified via the SCTP_RTOINFO socket option. 1622 */ 1623 unsigned long rto_initial; 1624 unsigned long rto_max; 1625 unsigned long rto_min; 1626 1627 /* Maximum number of new data packets that can be sent in a burst. */ 1628 int max_burst; 1629 1630 /* This is the max_retrans value for the association. This value will 1631 * be initialized initialized from system defaults, but can be 1632 * modified by the SCTP_ASSOCINFO socket option. 1633 */ 1634 int max_retrans; 1635 1636 /* Maximum number of times the endpoint will retransmit INIT */ 1637 __u16 max_init_attempts; 1638 1639 /* How many times have we resent an INIT? */ 1640 __u16 init_retries; 1641 1642 /* The largest timeout or RTO value to use in attempting an INIT */ 1643 unsigned long max_init_timeo; 1644 1645 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1646 * the destination address every heartbeat interval. This value 1647 * will be inherited by all new transports. 1648 */ 1649 unsigned long hbinterval; 1650 1651 /* This is the max_retrans value for new transports in the 1652 * association. 1653 */ 1654 __u16 pathmaxrxt; 1655 1656 /* Flag that path mtu update is pending */ 1657 __u8 pmtu_pending; 1658 1659 /* Association : The smallest PMTU discovered for all of the 1660 * PMTU : peer's transport addresses. 1661 */ 1662 __u32 pathmtu; 1663 1664 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1665 __u32 param_flags; 1666 1667 /* SACK delay timeout */ 1668 unsigned long sackdelay; 1669 __u32 sackfreq; 1670 1671 1672 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1673 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1674 1675 /* Transport to which SHUTDOWN chunk was last sent. */ 1676 struct sctp_transport *shutdown_last_sent_to; 1677 1678 /* How many times have we resent a SHUTDOWN */ 1679 int shutdown_retries; 1680 1681 /* Transport to which INIT chunk was last sent. */ 1682 struct sctp_transport *init_last_sent_to; 1683 1684 /* Next TSN : The next TSN number to be assigned to a new 1685 * : DATA chunk. This is sent in the INIT or INIT 1686 * : ACK chunk to the peer and incremented each 1687 * : time a DATA chunk is assigned a TSN 1688 * : (normally just prior to transmit or during 1689 * : fragmentation). 1690 */ 1691 __u32 next_tsn; 1692 1693 /* 1694 * Last Rcvd : This is the last TSN received in sequence. This value 1695 * TSN : is set initially by taking the peer's Initial TSN, 1696 * : received in the INIT or INIT ACK chunk, and 1697 * : subtracting one from it. 1698 * 1699 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1700 */ 1701 1702 __u32 ctsn_ack_point; 1703 1704 /* PR-SCTP Advanced.Peer.Ack.Point */ 1705 __u32 adv_peer_ack_point; 1706 1707 /* Highest TSN that is acknowledged by incoming SACKs. */ 1708 __u32 highest_sacked; 1709 1710 /* The number of unacknowledged data chunks. Reported through 1711 * the SCTP_STATUS sockopt. 1712 */ 1713 __u16 unack_data; 1714 1715 /* The total number of data chunks that we've had to retransmit 1716 * as the result of a T3 timer expiration 1717 */ 1718 __u32 rtx_data_chunks; 1719 1720 /* This is the association's receive buffer space. This value is used 1721 * to set a_rwnd field in an INIT or a SACK chunk. 1722 */ 1723 __u32 rwnd; 1724 1725 /* This is the last advertised value of rwnd over a SACK chunk. */ 1726 __u32 a_rwnd; 1727 1728 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1729 * to slop over a maximum of the association's frag_point. 1730 */ 1731 __u32 rwnd_over; 1732 1733 /* This is the sndbuf size in use for the association. 1734 * This corresponds to the sndbuf size for the association, 1735 * as specified in the sk->sndbuf. 1736 */ 1737 int sndbuf_used; 1738 1739 /* This is the amount of memory that this association has allocated 1740 * in the receive path at any given time. 1741 */ 1742 atomic_t rmem_alloc; 1743 1744 /* This is the wait queue head for send requests waiting on 1745 * the association sndbuf space. 1746 */ 1747 wait_queue_head_t wait; 1748 1749 /* The message size at which SCTP fragmentation will occur. */ 1750 __u32 frag_point; 1751 1752 /* Counter used to count INIT errors. */ 1753 int init_err_counter; 1754 1755 /* Count the number of INIT cycles (for doubling timeout). */ 1756 int init_cycle; 1757 1758 /* Default send parameters. */ 1759 __u16 default_stream; 1760 __u16 default_flags; 1761 __u32 default_ppid; 1762 __u32 default_context; 1763 __u32 default_timetolive; 1764 1765 /* Default receive parameters */ 1766 __u32 default_rcv_context; 1767 1768 /* This tracks outbound ssn for a given stream. */ 1769 struct sctp_ssnmap *ssnmap; 1770 1771 /* All outbound chunks go through this structure. */ 1772 struct sctp_outq outqueue; 1773 1774 /* A smart pipe that will handle reordering and fragmentation, 1775 * as well as handle passing events up to the ULP. 1776 */ 1777 struct sctp_ulpq ulpq; 1778 1779 /* Last TSN that caused an ECNE Chunk to be sent. */ 1780 __u32 last_ecne_tsn; 1781 1782 /* Last TSN that caused a CWR Chunk to be sent. */ 1783 __u32 last_cwr_tsn; 1784 1785 /* How many duplicated TSNs have we seen? */ 1786 int numduptsns; 1787 1788 /* Number of seconds of idle time before an association is closed. 1789 * In the association context, this is really used as a boolean 1790 * since the real timeout is stored in the timeouts array 1791 */ 1792 __u32 autoclose; 1793 1794 /* These are to support 1795 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1796 * and Enforcement of Flow and Message Limits" 1797 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1798 * or "ADDIP" for short. 1799 */ 1800 1801 1802 1803 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1804 * 1805 * R1) One and only one ASCONF Chunk MAY be in transit and 1806 * unacknowledged at any one time. If a sender, after sending 1807 * an ASCONF chunk, decides it needs to transfer another 1808 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1809 * returns from the previous ASCONF Chunk before sending a 1810 * subsequent ASCONF. Note this restriction binds each side, 1811 * so at any time two ASCONF may be in-transit on any given 1812 * association (one sent from each endpoint). 1813 * 1814 * [This is our one-and-only-one ASCONF in flight. If we do 1815 * not have an ASCONF in flight, this is NULL.] 1816 */ 1817 struct sctp_chunk *addip_last_asconf; 1818 1819 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1820 * 1821 * This is needed to implement itmes E1 - E4 of the updated 1822 * spec. Here is the justification: 1823 * 1824 * Since the peer may bundle multiple ASCONF chunks toward us, 1825 * we now need the ability to cache multiple ACKs. The section 1826 * describes in detail how they are cached and cleaned up. 1827 */ 1828 struct list_head asconf_ack_list; 1829 1830 /* These ASCONF chunks are waiting to be sent. 1831 * 1832 * These chunaks can't be pushed to outqueue until receiving 1833 * ASCONF_ACK for the previous ASCONF indicated by 1834 * addip_last_asconf, so as to guarantee that only one ASCONF 1835 * is in flight at any time. 1836 * 1837 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1838 * 1839 * In defining the ASCONF Chunk transfer procedures, it is 1840 * essential that these transfers MUST NOT cause congestion 1841 * within the network. To achieve this, we place these 1842 * restrictions on the transfer of ASCONF Chunks: 1843 * 1844 * R1) One and only one ASCONF Chunk MAY be in transit and 1845 * unacknowledged at any one time. If a sender, after sending 1846 * an ASCONF chunk, decides it needs to transfer another 1847 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1848 * returns from the previous ASCONF Chunk before sending a 1849 * subsequent ASCONF. Note this restriction binds each side, 1850 * so at any time two ASCONF may be in-transit on any given 1851 * association (one sent from each endpoint). 1852 * 1853 * 1854 * [I really think this is EXACTLY the sort of intelligence 1855 * which already resides in sctp_outq. Please move this 1856 * queue and its supporting logic down there. --piggy] 1857 */ 1858 struct list_head addip_chunk_list; 1859 1860 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1861 * 1862 * A2) A serial number should be assigned to the Chunk. The 1863 * serial number SHOULD be a monotonically increasing 1864 * number. The serial number SHOULD be initialized at 1865 * the start of the association to the same value as the 1866 * Initial TSN and every time a new ASCONF chunk is created 1867 * it is incremented by one after assigning the serial number 1868 * to the newly created chunk. 1869 * 1870 * ADDIP 1871 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1872 * 1873 * Serial Number : 32 bits (unsigned integer) 1874 * 1875 * This value represents a Serial Number for the ASCONF 1876 * Chunk. The valid range of Serial Number is from 0 to 1877 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1878 * after reaching 4294967295. 1879 */ 1880 __u32 addip_serial; 1881 1882 /* SCTP AUTH: list of the endpoint shared keys. These 1883 * keys are provided out of band by the user applicaton 1884 * and can't change during the lifetime of the association 1885 */ 1886 struct list_head endpoint_shared_keys; 1887 1888 /* SCTP AUTH: 1889 * The current generated assocaition shared key (secret) 1890 */ 1891 struct sctp_auth_bytes *asoc_shared_key; 1892 1893 /* SCTP AUTH: hmac id of the first peer requested algorithm 1894 * that we support. 1895 */ 1896 __u16 default_hmac_id; 1897 1898 __u16 active_key_id; 1899 1900 /* Need to send an ECNE Chunk? */ 1901 char need_ecne; 1902 1903 /* Is it a temporary association? */ 1904 char temp; 1905 }; 1906 1907 1908 /* An eyecatcher for determining if we are really looking at an 1909 * association data structure. 1910 */ 1911 enum { 1912 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1913 }; 1914 1915 /* Recover the outter association structure. */ 1916 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1917 { 1918 struct sctp_association *asoc; 1919 1920 asoc = container_of(base, struct sctp_association, base); 1921 return asoc; 1922 } 1923 1924 /* These are function signatures for manipulating associations. */ 1925 1926 1927 struct sctp_association * 1928 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1929 sctp_scope_t scope, gfp_t gfp); 1930 void sctp_association_free(struct sctp_association *); 1931 void sctp_association_put(struct sctp_association *); 1932 void sctp_association_hold(struct sctp_association *); 1933 1934 struct sctp_transport *sctp_assoc_choose_init_transport( 1935 struct sctp_association *); 1936 struct sctp_transport *sctp_assoc_choose_shutdown_transport( 1937 struct sctp_association *); 1938 void sctp_assoc_update_retran_path(struct sctp_association *); 1939 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1940 const union sctp_addr *); 1941 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1942 const union sctp_addr *laddr); 1943 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1944 const union sctp_addr *address, 1945 const gfp_t gfp, 1946 const int peer_state); 1947 void sctp_assoc_del_peer(struct sctp_association *asoc, 1948 const union sctp_addr *addr); 1949 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1950 struct sctp_transport *peer); 1951 void sctp_assoc_control_transport(struct sctp_association *, 1952 struct sctp_transport *, 1953 sctp_transport_cmd_t, sctp_sn_error_t); 1954 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1955 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1956 const union sctp_addr *, 1957 const union sctp_addr *); 1958 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1959 void sctp_assoc_update(struct sctp_association *old, 1960 struct sctp_association *new); 1961 1962 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1963 1964 void sctp_assoc_sync_pmtu(struct sctp_association *); 1965 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1966 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1967 void sctp_assoc_set_primary(struct sctp_association *, 1968 struct sctp_transport *); 1969 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1970 struct sctp_transport *); 1971 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1972 gfp_t); 1973 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1974 struct sctp_cookie*, 1975 gfp_t gfp); 1976 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1977 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1978 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1979 const struct sctp_association *asoc, 1980 __be32 serial); 1981 1982 1983 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1984 const union sctp_addr *ss2); 1985 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1986 1987 /* A convenience structure to parse out SCTP specific CMSGs. */ 1988 typedef struct sctp_cmsgs { 1989 struct sctp_initmsg *init; 1990 struct sctp_sndrcvinfo *info; 1991 } sctp_cmsgs_t; 1992 1993 /* Structure for tracking memory objects */ 1994 typedef struct { 1995 char *label; 1996 atomic_t *counter; 1997 } sctp_dbg_objcnt_entry_t; 1998 1999 #endif /* __sctp_structs_h__ */ 2000