1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * This SCTP implementation is free software; 10 * you can redistribute it and/or modify it under the terms of 11 * the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This SCTP implementation is distributed in the hope that it 16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 17 * ************************ 18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 19 * See the GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with GNU CC; see the file COPYING. If not, write to 23 * the Free Software Foundation, 59 Temple Place - Suite 330, 24 * Boston, MA 02111-1307, USA. 25 * 26 * Please send any bug reports or fixes you make to the 27 * email addresses: 28 * lksctp developers <lksctp-developers@lists.sourceforge.net> 29 * 30 * Or submit a bug report through the following website: 31 * http://www.sf.net/projects/lksctp 32 * 33 * Written or modified by: 34 * Randall Stewart <randall@sctp.chicago.il.us> 35 * Ken Morneau <kmorneau@cisco.com> 36 * Qiaobing Xie <qxie1@email.mot.com> 37 * La Monte H.P. Yarroll <piggy@acm.org> 38 * Karl Knutson <karl@athena.chicago.il.us> 39 * Jon Grimm <jgrimm@us.ibm.com> 40 * Xingang Guo <xingang.guo@intel.com> 41 * Hui Huang <hui.huang@nokia.com> 42 * Sridhar Samudrala <sri@us.ibm.com> 43 * Daisy Chang <daisyc@us.ibm.com> 44 * Dajiang Zhang <dajiang.zhang@nokia.com> 45 * Ardelle Fan <ardelle.fan@intel.com> 46 * Ryan Layer <rmlayer@us.ibm.com> 47 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 48 * Kevin Gao <kevin.gao@intel.com> 49 * 50 * Any bugs reported given to us we will try to fix... any fixes shared will 51 * be incorporated into the next SCTP release. 52 */ 53 54 #ifndef __sctp_structs_h__ 55 #define __sctp_structs_h__ 56 57 #include <linux/time.h> /* We get struct timespec. */ 58 #include <linux/socket.h> /* linux/in.h needs this!! */ 59 #include <linux/in.h> /* We get struct sockaddr_in. */ 60 #include <linux/in6.h> /* We get struct in6_addr */ 61 #include <linux/ipv6.h> 62 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 63 #include <asm/atomic.h> /* This gets us atomic counters. */ 64 #include <linux/skbuff.h> /* We need sk_buff_head. */ 65 #include <linux/workqueue.h> /* We need tq_struct. */ 66 #include <linux/sctp.h> /* We need sctp* header structs. */ 67 #include <net/sctp/auth.h> /* We need auth specific structs */ 68 69 /* A convenience structure for handling sockaddr structures. 70 * We should wean ourselves off this. 71 */ 72 union sctp_addr { 73 struct sockaddr_in v4; 74 struct sockaddr_in6 v6; 75 struct sockaddr sa; 76 }; 77 78 /* Forward declarations for data structures. */ 79 struct sctp_globals; 80 struct sctp_endpoint; 81 struct sctp_association; 82 struct sctp_transport; 83 struct sctp_packet; 84 struct sctp_chunk; 85 struct sctp_inq; 86 struct sctp_outq; 87 struct sctp_bind_addr; 88 struct sctp_ulpq; 89 struct sctp_ep_common; 90 struct sctp_ssnmap; 91 struct crypto_hash; 92 93 94 #include <net/sctp/tsnmap.h> 95 #include <net/sctp/ulpevent.h> 96 #include <net/sctp/ulpqueue.h> 97 98 /* Structures useful for managing bind/connect. */ 99 100 struct sctp_bind_bucket { 101 unsigned short port; 102 unsigned short fastreuse; 103 struct hlist_node node; 104 struct hlist_head owner; 105 }; 106 107 struct sctp_bind_hashbucket { 108 spinlock_t lock; 109 struct hlist_head chain; 110 }; 111 112 /* Used for hashing all associations. */ 113 struct sctp_hashbucket { 114 rwlock_t lock; 115 struct hlist_head chain; 116 } __attribute__((__aligned__(8))); 117 118 119 /* The SCTP globals structure. */ 120 extern struct sctp_globals { 121 /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values 122 * 123 * The following protocol parameters are RECOMMENDED: 124 * 125 * RTO.Initial - 3 seconds 126 * RTO.Min - 1 second 127 * RTO.Max - 60 seconds 128 * RTO.Alpha - 1/8 (3 when converted to right shifts.) 129 * RTO.Beta - 1/4 (2 when converted to right shifts.) 130 */ 131 unsigned int rto_initial; 132 unsigned int rto_min; 133 unsigned int rto_max; 134 135 /* Note: rto_alpha and rto_beta are really defined as inverse 136 * powers of two to facilitate integer operations. 137 */ 138 int rto_alpha; 139 int rto_beta; 140 141 /* Max.Burst - 4 */ 142 int max_burst; 143 144 /* Whether Cookie Preservative is enabled(1) or not(0) */ 145 int cookie_preserve_enable; 146 147 /* Valid.Cookie.Life - 60 seconds */ 148 unsigned int valid_cookie_life; 149 150 /* Delayed SACK timeout 200ms default*/ 151 unsigned int sack_timeout; 152 153 /* HB.interval - 30 seconds */ 154 unsigned int hb_interval; 155 156 /* Association.Max.Retrans - 10 attempts 157 * Path.Max.Retrans - 5 attempts (per destination address) 158 * Max.Init.Retransmits - 8 attempts 159 */ 160 int max_retrans_association; 161 int max_retrans_path; 162 int max_retrans_init; 163 164 /* 165 * Policy for preforming sctp/socket accounting 166 * 0 - do socket level accounting, all assocs share sk_sndbuf 167 * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes 168 */ 169 int sndbuf_policy; 170 171 /* 172 * Policy for preforming sctp/socket accounting 173 * 0 - do socket level accounting, all assocs share sk_rcvbuf 174 * 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes 175 */ 176 int rcvbuf_policy; 177 178 /* The following variables are implementation specific. */ 179 180 /* Default initialization values to be applied to new associations. */ 181 __u16 max_instreams; 182 __u16 max_outstreams; 183 184 /* This is a list of groups of functions for each address 185 * family that we support. 186 */ 187 struct list_head address_families; 188 189 /* This is the hash of all endpoints. */ 190 int ep_hashsize; 191 struct sctp_hashbucket *ep_hashtable; 192 193 /* This is the hash of all associations. */ 194 int assoc_hashsize; 195 struct sctp_hashbucket *assoc_hashtable; 196 197 /* This is the sctp port control hash. */ 198 int port_hashsize; 199 struct sctp_bind_hashbucket *port_hashtable; 200 201 /* This is the global local address list. 202 * We actively maintain this complete list of addresses on 203 * the system by catching address add/delete events. 204 * 205 * It is a list of sctp_sockaddr_entry. 206 */ 207 struct list_head local_addr_list; 208 209 /* Lock that protects the local_addr_list writers */ 210 spinlock_t addr_list_lock; 211 212 /* Flag to indicate if addip is enabled. */ 213 int addip_enable; 214 int addip_noauth_enable; 215 216 /* Flag to indicate if PR-SCTP is enabled. */ 217 int prsctp_enable; 218 219 /* Flag to idicate if SCTP-AUTH is enabled */ 220 int auth_enable; 221 } sctp_globals; 222 223 #define sctp_rto_initial (sctp_globals.rto_initial) 224 #define sctp_rto_min (sctp_globals.rto_min) 225 #define sctp_rto_max (sctp_globals.rto_max) 226 #define sctp_rto_alpha (sctp_globals.rto_alpha) 227 #define sctp_rto_beta (sctp_globals.rto_beta) 228 #define sctp_max_burst (sctp_globals.max_burst) 229 #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) 230 #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) 231 #define sctp_max_retrans_association (sctp_globals.max_retrans_association) 232 #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) 233 #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) 234 #define sctp_max_retrans_path (sctp_globals.max_retrans_path) 235 #define sctp_max_retrans_init (sctp_globals.max_retrans_init) 236 #define sctp_sack_timeout (sctp_globals.sack_timeout) 237 #define sctp_hb_interval (sctp_globals.hb_interval) 238 #define sctp_max_instreams (sctp_globals.max_instreams) 239 #define sctp_max_outstreams (sctp_globals.max_outstreams) 240 #define sctp_address_families (sctp_globals.address_families) 241 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 242 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 243 #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) 244 #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) 245 #define sctp_port_hashsize (sctp_globals.port_hashsize) 246 #define sctp_port_rover (sctp_globals.port_rover) 247 #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) 248 #define sctp_port_hashtable (sctp_globals.port_hashtable) 249 #define sctp_local_addr_list (sctp_globals.local_addr_list) 250 #define sctp_local_addr_lock (sctp_globals.addr_list_lock) 251 #define sctp_addip_enable (sctp_globals.addip_enable) 252 #define sctp_addip_noauth (sctp_globals.addip_noauth_enable) 253 #define sctp_prsctp_enable (sctp_globals.prsctp_enable) 254 #define sctp_auth_enable (sctp_globals.auth_enable) 255 256 /* SCTP Socket type: UDP or TCP style. */ 257 typedef enum { 258 SCTP_SOCKET_UDP = 0, 259 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 260 SCTP_SOCKET_TCP 261 } sctp_socket_type_t; 262 263 /* Per socket SCTP information. */ 264 struct sctp_sock { 265 /* inet_sock has to be the first member of sctp_sock */ 266 struct inet_sock inet; 267 /* What kind of a socket is this? */ 268 sctp_socket_type_t type; 269 270 /* PF_ family specific functions. */ 271 struct sctp_pf *pf; 272 273 /* Access to HMAC transform. */ 274 struct crypto_hash *hmac; 275 276 /* What is our base endpointer? */ 277 struct sctp_endpoint *ep; 278 279 struct sctp_bind_bucket *bind_hash; 280 /* Various Socket Options. */ 281 __u16 default_stream; 282 __u32 default_ppid; 283 __u16 default_flags; 284 __u32 default_context; 285 __u32 default_timetolive; 286 __u32 default_rcv_context; 287 int max_burst; 288 289 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 290 * the destination address every heartbeat interval. This value 291 * will be inherited by all new associations. 292 */ 293 __u32 hbinterval; 294 295 /* This is the max_retrans value for new associations. */ 296 __u16 pathmaxrxt; 297 298 /* The initial Path MTU to use for new associations. */ 299 __u32 pathmtu; 300 301 /* The default SACK delay timeout for new associations. */ 302 __u32 sackdelay; 303 304 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 305 __u32 param_flags; 306 307 struct sctp_initmsg initmsg; 308 struct sctp_rtoinfo rtoinfo; 309 struct sctp_paddrparams paddrparam; 310 struct sctp_event_subscribe subscribe; 311 struct sctp_assocparams assocparams; 312 int user_frag; 313 __u32 autoclose; 314 __u8 nodelay; 315 __u8 disable_fragments; 316 __u8 v4mapped; 317 __u8 frag_interleave; 318 __u32 adaptation_ind; 319 __u32 pd_point; 320 321 atomic_t pd_mode; 322 /* Receive to here while partial delivery is in effect. */ 323 struct sk_buff_head pd_lobby; 324 }; 325 326 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 327 { 328 return (struct sctp_sock *)sk; 329 } 330 331 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 332 { 333 return (struct sock *)sp; 334 } 335 336 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 337 struct sctp6_sock { 338 struct sctp_sock sctp; 339 struct ipv6_pinfo inet6; 340 }; 341 #endif /* CONFIG_IPV6 */ 342 343 344 /* This is our APPLICATION-SPECIFIC state cookie. 345 * THIS IS NOT DICTATED BY THE SPECIFICATION. 346 */ 347 /* These are the parts of an association which we send in the cookie. 348 * Most of these are straight out of: 349 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 350 * 351 */ 352 353 struct sctp_cookie { 354 355 /* My : Tag expected in every inbound packet and sent 356 * Verification: in the INIT or INIT ACK chunk. 357 * Tag : 358 */ 359 __u32 my_vtag; 360 361 /* Peer's : Tag expected in every outbound packet except 362 * Verification: in the INIT chunk. 363 * Tag : 364 */ 365 __u32 peer_vtag; 366 367 /* The rest of these are not from the spec, but really need to 368 * be in the cookie. 369 */ 370 371 /* My Tie Tag : Assist in discovering a restarting association. */ 372 __u32 my_ttag; 373 374 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 375 __u32 peer_ttag; 376 377 /* When does this cookie expire? */ 378 struct timeval expiration; 379 380 /* Number of inbound/outbound streams which are set 381 * and negotiated during the INIT process. 382 */ 383 __u16 sinit_num_ostreams; 384 __u16 sinit_max_instreams; 385 386 /* This is the first sequence number I used. */ 387 __u32 initial_tsn; 388 389 /* This holds the originating address of the INIT packet. */ 390 union sctp_addr peer_addr; 391 392 /* IG Section 2.35.3 393 * Include the source port of the INIT-ACK 394 */ 395 __u16 my_port; 396 397 __u8 prsctp_capable; 398 399 /* Padding for future use */ 400 __u8 padding; 401 402 __u32 adaptation_ind; 403 404 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 405 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 406 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 407 408 /* This is a shim for my peer's INIT packet, followed by 409 * a copy of the raw address list of the association. 410 * The length of the raw address list is saved in the 411 * raw_addr_list_len field, which will be used at the time when 412 * the association TCB is re-constructed from the cookie. 413 */ 414 __u32 raw_addr_list_len; 415 struct sctp_init_chunk peer_init[0]; 416 }; 417 418 419 /* The format of our cookie that we send to our peer. */ 420 struct sctp_signed_cookie { 421 __u8 signature[SCTP_SECRET_SIZE]; 422 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 423 struct sctp_cookie c; 424 } __attribute__((packed)); 425 426 /* This is another convenience type to allocate memory for address 427 * params for the maximum size and pass such structures around 428 * internally. 429 */ 430 union sctp_addr_param { 431 struct sctp_paramhdr p; 432 struct sctp_ipv4addr_param v4; 433 struct sctp_ipv6addr_param v6; 434 }; 435 436 /* A convenience type to allow walking through the various 437 * parameters and avoid casting all over the place. 438 */ 439 union sctp_params { 440 void *v; 441 struct sctp_paramhdr *p; 442 struct sctp_cookie_preserve_param *life; 443 struct sctp_hostname_param *dns; 444 struct sctp_cookie_param *cookie; 445 struct sctp_supported_addrs_param *sat; 446 struct sctp_ipv4addr_param *v4; 447 struct sctp_ipv6addr_param *v6; 448 union sctp_addr_param *addr; 449 struct sctp_adaptation_ind_param *aind; 450 struct sctp_supported_ext_param *ext; 451 struct sctp_random_param *random; 452 struct sctp_chunks_param *chunks; 453 struct sctp_hmac_algo_param *hmac_algo; 454 struct sctp_addip_param *addip; 455 }; 456 457 /* RFC 2960. Section 3.3.5 Heartbeat. 458 * Heartbeat Information: variable length 459 * The Sender-specific Heartbeat Info field should normally include 460 * information about the sender's current time when this HEARTBEAT 461 * chunk is sent and the destination transport address to which this 462 * HEARTBEAT is sent (see Section 8.3). 463 */ 464 typedef struct sctp_sender_hb_info { 465 struct sctp_paramhdr param_hdr; 466 union sctp_addr daddr; 467 unsigned long sent_at; 468 __u64 hb_nonce; 469 } __attribute__((packed)) sctp_sender_hb_info_t; 470 471 /* 472 * RFC 2960 1.3.2 Sequenced Delivery within Streams 473 * 474 * The term "stream" is used in SCTP to refer to a sequence of user 475 * messages that are to be delivered to the upper-layer protocol in 476 * order with respect to other messages within the same stream. This is 477 * in contrast to its usage in TCP, where it refers to a sequence of 478 * bytes (in this document a byte is assumed to be eight bits). 479 * ... 480 * 481 * This is the structure we use to track both our outbound and inbound 482 * SSN, or Stream Sequence Numbers. 483 */ 484 485 struct sctp_stream { 486 __u16 *ssn; 487 unsigned int len; 488 }; 489 490 struct sctp_ssnmap { 491 struct sctp_stream in; 492 struct sctp_stream out; 493 int malloced; 494 }; 495 496 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 497 gfp_t gfp); 498 void sctp_ssnmap_free(struct sctp_ssnmap *map); 499 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 500 501 /* What is the current SSN number for this stream? */ 502 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 503 { 504 return stream->ssn[id]; 505 } 506 507 /* Return the next SSN number for this stream. */ 508 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 509 { 510 return stream->ssn[id]++; 511 } 512 513 /* Skip over this ssn and all below. */ 514 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 515 __u16 ssn) 516 { 517 stream->ssn[id] = ssn+1; 518 } 519 520 /* 521 * Pointers to address related SCTP functions. 522 * (i.e. things that depend on the address family.) 523 */ 524 struct sctp_af { 525 int (*sctp_xmit) (struct sk_buff *skb, 526 struct sctp_transport *, 527 int ipfragok); 528 int (*setsockopt) (struct sock *sk, 529 int level, 530 int optname, 531 char __user *optval, 532 int optlen); 533 int (*getsockopt) (struct sock *sk, 534 int level, 535 int optname, 536 char __user *optval, 537 int __user *optlen); 538 int (*compat_setsockopt) (struct sock *sk, 539 int level, 540 int optname, 541 char __user *optval, 542 int optlen); 543 int (*compat_getsockopt) (struct sock *sk, 544 int level, 545 int optname, 546 char __user *optval, 547 int __user *optlen); 548 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 549 union sctp_addr *daddr, 550 union sctp_addr *saddr); 551 void (*get_saddr) (struct sctp_association *asoc, 552 struct dst_entry *dst, 553 union sctp_addr *daddr, 554 union sctp_addr *saddr); 555 void (*copy_addrlist) (struct list_head *, 556 struct net_device *); 557 void (*dst_saddr) (union sctp_addr *saddr, 558 struct dst_entry *dst, 559 __be16 port); 560 int (*cmp_addr) (const union sctp_addr *addr1, 561 const union sctp_addr *addr2); 562 void (*addr_copy) (union sctp_addr *dst, 563 union sctp_addr *src); 564 void (*from_skb) (union sctp_addr *, 565 struct sk_buff *skb, 566 int saddr); 567 void (*from_sk) (union sctp_addr *, 568 struct sock *sk); 569 void (*to_sk_saddr) (union sctp_addr *, 570 struct sock *sk); 571 void (*to_sk_daddr) (union sctp_addr *, 572 struct sock *sk); 573 void (*from_addr_param) (union sctp_addr *, 574 union sctp_addr_param *, 575 __be16 port, int iif); 576 int (*to_addr_param) (const union sctp_addr *, 577 union sctp_addr_param *); 578 int (*addr_valid) (union sctp_addr *, 579 struct sctp_sock *, 580 const struct sk_buff *); 581 sctp_scope_t (*scope) (union sctp_addr *); 582 void (*inaddr_any) (union sctp_addr *, __be16); 583 int (*is_any) (const union sctp_addr *); 584 int (*available) (union sctp_addr *, 585 struct sctp_sock *); 586 int (*skb_iif) (const struct sk_buff *sk); 587 int (*is_ce) (const struct sk_buff *sk); 588 void (*seq_dump_addr)(struct seq_file *seq, 589 union sctp_addr *addr); 590 __u16 net_header_len; 591 int sockaddr_len; 592 sa_family_t sa_family; 593 struct list_head list; 594 }; 595 596 struct sctp_af *sctp_get_af_specific(sa_family_t); 597 int sctp_register_af(struct sctp_af *); 598 599 /* Protocol family functions. */ 600 struct sctp_pf { 601 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 602 void (*skb_msgname) (struct sk_buff *, char *, int *); 603 int (*af_supported) (sa_family_t, struct sctp_sock *); 604 int (*cmp_addr) (const union sctp_addr *, 605 const union sctp_addr *, 606 struct sctp_sock *); 607 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 608 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 609 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 610 struct sock *(*create_accept_sk) (struct sock *sk, 611 struct sctp_association *asoc); 612 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 613 struct sctp_af *af; 614 }; 615 616 617 /* Structure to track chunk fragments that have been acked, but peer 618 * fragments of the same message have not. 619 */ 620 struct sctp_datamsg { 621 /* Chunks waiting to be submitted to lower layer. */ 622 struct list_head chunks; 623 /* Chunks that have been transmitted. */ 624 struct list_head track; 625 /* Reference counting. */ 626 atomic_t refcnt; 627 /* When is this message no longer interesting to the peer? */ 628 unsigned long expires_at; 629 /* Did the messenge fail to send? */ 630 int send_error; 631 char send_failed; 632 /* Control whether chunks from this message can be abandoned. */ 633 char can_abandon; 634 }; 635 636 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 637 struct sctp_sndrcvinfo *, 638 struct msghdr *, int len); 639 void sctp_datamsg_put(struct sctp_datamsg *); 640 void sctp_chunk_fail(struct sctp_chunk *, int error); 641 int sctp_chunk_abandoned(struct sctp_chunk *); 642 643 /* RFC2960 1.4 Key Terms 644 * 645 * o Chunk: A unit of information within an SCTP packet, consisting of 646 * a chunk header and chunk-specific content. 647 * 648 * As a matter of convenience, we remember the SCTP common header for 649 * each chunk as well as a few other header pointers... 650 */ 651 struct sctp_chunk { 652 struct list_head list; 653 654 atomic_t refcnt; 655 656 /* This is our link to the per-transport transmitted list. */ 657 struct list_head transmitted_list; 658 659 /* This field is used by chunks that hold fragmented data. 660 * For the first fragment this is the list that holds the rest of 661 * fragments. For the remaining fragments, this is the link to the 662 * frag_list maintained in the first fragment. 663 */ 664 struct list_head frag_list; 665 666 /* This points to the sk_buff containing the actual data. */ 667 struct sk_buff *skb; 668 669 /* These are the SCTP headers by reverse order in a packet. 670 * Note that some of these may happen more than once. In that 671 * case, we point at the "current" one, whatever that means 672 * for that level of header. 673 */ 674 675 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 676 union sctp_params param_hdr; 677 union { 678 __u8 *v; 679 struct sctp_datahdr *data_hdr; 680 struct sctp_inithdr *init_hdr; 681 struct sctp_sackhdr *sack_hdr; 682 struct sctp_heartbeathdr *hb_hdr; 683 struct sctp_sender_hb_info *hbs_hdr; 684 struct sctp_shutdownhdr *shutdown_hdr; 685 struct sctp_signed_cookie *cookie_hdr; 686 struct sctp_ecnehdr *ecne_hdr; 687 struct sctp_cwrhdr *ecn_cwr_hdr; 688 struct sctp_errhdr *err_hdr; 689 struct sctp_addiphdr *addip_hdr; 690 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 691 struct sctp_authhdr *auth_hdr; 692 } subh; 693 694 __u8 *chunk_end; 695 696 struct sctp_chunkhdr *chunk_hdr; 697 struct sctphdr *sctp_hdr; 698 699 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 700 struct sctp_sndrcvinfo sinfo; 701 702 /* Which association does this belong to? */ 703 struct sctp_association *asoc; 704 705 /* What endpoint received this chunk? */ 706 struct sctp_ep_common *rcvr; 707 708 /* We fill this in if we are calculating RTT. */ 709 unsigned long sent_at; 710 711 /* What is the origin IP address for this chunk? */ 712 union sctp_addr source; 713 /* Destination address for this chunk. */ 714 union sctp_addr dest; 715 716 /* For outbound message, track all fragments for SEND_FAILED. */ 717 struct sctp_datamsg *msg; 718 719 /* For an inbound chunk, this tells us where it came from. 720 * For an outbound chunk, it tells us where we'd like it to 721 * go. It is NULL if we have no preference. 722 */ 723 struct sctp_transport *transport; 724 725 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 726 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 727 * spec violates the principle premis that all chunks are processed 728 * in order. 729 */ 730 struct sk_buff *auth_chunk; 731 732 __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ 733 __u8 resent; /* Has this chunk ever been retransmitted. */ 734 __u8 has_tsn; /* Does this chunk have a TSN yet? */ 735 __u8 has_ssn; /* Does this chunk have a SSN yet? */ 736 __u8 singleton; /* Was this the only chunk in the packet? */ 737 __u8 end_of_packet; /* Was this the last chunk in the packet? */ 738 __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ 739 __u8 pdiscard; /* Discard the whole packet now? */ 740 __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ 741 __s8 fast_retransmit; /* Is this chunk fast retransmitted? */ 742 __u8 tsn_missing_report; /* Data chunk missing counter. */ 743 __u8 data_accepted; /* At least 1 chunk in this packet accepted */ 744 __u8 auth; /* IN: was auth'ed | OUT: needs auth */ 745 __u8 has_asconf; /* IN: have seen an asconf before */ 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 enum { 762 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 763 SCTP_ADDR_SRC, /* address can be used as source */ 764 SCTP_ADDR_DEL, /* address about to be deleted */ 765 }; 766 767 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 768 struct sctp_sockaddr_entry { 769 struct list_head list; 770 struct rcu_head rcu; 771 union sctp_addr a; 772 __u8 state; 773 __u8 valid; 774 }; 775 776 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 777 778 /* This structure holds lists of chunks as we are assembling for 779 * transmission. 780 */ 781 struct sctp_packet { 782 /* These are the SCTP header values (host order) for the packet. */ 783 __u16 source_port; 784 __u16 destination_port; 785 __u32 vtag; 786 787 /* This contains the payload chunks. */ 788 struct list_head chunk_list; 789 790 /* This is the overhead of the sctp and ip headers. */ 791 size_t overhead; 792 /* This is the total size of all chunks INCLUDING padding. */ 793 size_t size; 794 795 /* The packet is destined for this transport address. 796 * The function we finally use to pass down to the next lower 797 * layer lives in the transport structure. 798 */ 799 struct sctp_transport *transport; 800 801 /* pointer to the auth chunk for this packet */ 802 struct sctp_chunk *auth; 803 804 /* This packet contains a COOKIE-ECHO chunk. */ 805 __u8 has_cookie_echo; 806 807 /* This packet contains a SACK chunk. */ 808 __u8 has_sack; 809 810 /* This packet contains an AUTH chunk */ 811 __u8 has_auth; 812 813 /* This packet contains at least 1 DATA chunk */ 814 __u8 has_data; 815 816 /* SCTP cannot fragment this packet. So let ip fragment it. */ 817 __u8 ipfragok; 818 819 __u8 malloced; 820 }; 821 822 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 823 struct sctp_transport *, 824 __u16 sport, __u16 dport); 825 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 826 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 827 struct sctp_chunk *); 828 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 829 struct sctp_chunk *); 830 int sctp_packet_transmit(struct sctp_packet *); 831 void sctp_packet_free(struct sctp_packet *); 832 833 static inline int sctp_packet_empty(struct sctp_packet *packet) 834 { 835 return (packet->size == packet->overhead); 836 } 837 838 /* This represents a remote transport address. 839 * For local transport addresses, we just use union sctp_addr. 840 * 841 * RFC2960 Section 1.4 Key Terms 842 * 843 * o Transport address: A Transport Address is traditionally defined 844 * by Network Layer address, Transport Layer protocol and Transport 845 * Layer port number. In the case of SCTP running over IP, a 846 * transport address is defined by the combination of an IP address 847 * and an SCTP port number (where SCTP is the Transport protocol). 848 * 849 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 850 * 851 * o The sender keeps a separate congestion control parameter set for 852 * each of the destination addresses it can send to (not each 853 * source-destination pair but for each destination). The parameters 854 * should decay if the address is not used for a long enough time 855 * period. 856 * 857 */ 858 struct sctp_transport { 859 /* A list of transports. */ 860 struct list_head transports; 861 862 /* Reference counting. */ 863 atomic_t refcnt; 864 int dead; 865 866 /* This is the peer's IP address and port. */ 867 union sctp_addr ipaddr; 868 869 /* These are the functions we call to handle LLP stuff. */ 870 struct sctp_af *af_specific; 871 872 /* Which association do we belong to? */ 873 struct sctp_association *asoc; 874 875 /* RFC2960 876 * 877 * 12.3 Per Transport Address Data 878 * 879 * For each destination transport address in the peer's 880 * address list derived from the INIT or INIT ACK chunk, a 881 * number of data elements needs to be maintained including: 882 */ 883 /* RTO : The current retransmission timeout value. */ 884 unsigned long rto; 885 unsigned long last_rto; 886 887 __u32 rtt; /* This is the most recent RTT. */ 888 889 /* RTTVAR : The current RTT variation. */ 890 __u32 rttvar; 891 892 /* SRTT : The current smoothed round trip time. */ 893 __u32 srtt; 894 895 /* RTO-Pending : A flag used to track if one of the DATA 896 * chunks sent to this address is currently being 897 * used to compute a RTT. If this flag is 0, 898 * the next DATA chunk sent to this destination 899 * should be used to compute a RTT and this flag 900 * should be set. Every time the RTT 901 * calculation completes (i.e. the DATA chunk 902 * is SACK'd) clear this flag. 903 */ 904 int rto_pending; 905 906 /* 907 * These are the congestion stats. 908 */ 909 /* cwnd : The current congestion window. */ 910 __u32 cwnd; /* This is the actual cwnd. */ 911 912 /* ssthresh : The current slow start threshold value. */ 913 __u32 ssthresh; 914 915 /* partial : The tracking method for increase of cwnd when in 916 * bytes acked : congestion avoidance mode (see Section 6.2.2) 917 */ 918 __u32 partial_bytes_acked; 919 920 /* Data that has been sent, but not acknowledged. */ 921 __u32 flight_size; 922 923 /* Destination */ 924 struct dst_entry *dst; 925 /* Source address. */ 926 union sctp_addr saddr; 927 928 /* When was the last time(in jiffies) that a data packet was sent on 929 * this transport? This is used to adjust the cwnd when the transport 930 * becomes inactive. 931 */ 932 unsigned long last_time_used; 933 934 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 935 * the destination address every heartbeat interval. 936 */ 937 unsigned long hbinterval; 938 939 /* SACK delay timeout */ 940 unsigned long sackdelay; 941 942 /* When was the last time (in jiffies) that we heard from this 943 * transport? We use this to pick new active and retran paths. 944 */ 945 unsigned long last_time_heard; 946 947 /* Last time(in jiffies) when cwnd is reduced due to the congestion 948 * indication based on ECNE chunk. 949 */ 950 unsigned long last_time_ecne_reduced; 951 952 /* This is the max_retrans value for the transport and will 953 * be initialized from the assocs value. This can be changed 954 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 955 */ 956 __u16 pathmaxrxt; 957 958 /* is the Path MTU update pending on this tranport */ 959 __u8 pmtu_pending; 960 961 /* PMTU : The current known path MTU. */ 962 __u32 pathmtu; 963 964 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 965 __u32 param_flags; 966 967 /* The number of times INIT has been sent on this transport. */ 968 int init_sent_count; 969 970 /* state : The current state of this destination, 971 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. 972 */ 973 int state; 974 975 /* These are the error stats for this destination. */ 976 977 /* Error count : The current error count for this destination. */ 978 unsigned short error_count; 979 980 /* Per : A timer used by each destination. 981 * Destination : 982 * Timer : 983 * 984 * [Everywhere else in the text this is called T3-rtx. -ed] 985 */ 986 struct timer_list T3_rtx_timer; 987 988 /* Heartbeat timer is per destination. */ 989 struct timer_list hb_timer; 990 991 /* Since we're using per-destination retransmission timers 992 * (see above), we're also using per-destination "transmitted" 993 * queues. This probably ought to be a private struct 994 * accessible only within the outqueue, but it's not, yet. 995 */ 996 struct list_head transmitted; 997 998 /* We build bundle-able packets for this transport here. */ 999 struct sctp_packet packet; 1000 1001 /* This is the list of transports that have chunks to send. */ 1002 struct list_head send_ready; 1003 1004 int malloced; /* Is this structure kfree()able? */ 1005 1006 /* State information saved for SFR_CACC algorithm. The key 1007 * idea in SFR_CACC is to maintain state at the sender on a 1008 * per-destination basis when a changeover happens. 1009 * char changeover_active; 1010 * char cycling_changeover; 1011 * __u32 next_tsn_at_change; 1012 * char cacc_saw_newack; 1013 */ 1014 struct { 1015 /* An unsigned integer, which stores the next TSN to be 1016 * used by the sender, at the moment of changeover. 1017 */ 1018 __u32 next_tsn_at_change; 1019 1020 /* A flag which indicates the occurrence of a changeover */ 1021 char changeover_active; 1022 1023 /* A flag which indicates whether the change of primary is 1024 * the first switch to this destination address during an 1025 * active switch. 1026 */ 1027 char cycling_changeover; 1028 1029 /* A temporary flag, which is used during the processing of 1030 * a SACK to estimate the causative TSN(s)'s group. 1031 */ 1032 char cacc_saw_newack; 1033 } cacc; 1034 1035 /* 64-bit random number sent with heartbeat. */ 1036 __u64 hb_nonce; 1037 }; 1038 1039 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1040 gfp_t); 1041 void sctp_transport_set_owner(struct sctp_transport *, 1042 struct sctp_association *); 1043 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1044 struct sctp_sock *); 1045 void sctp_transport_pmtu(struct sctp_transport *); 1046 void sctp_transport_free(struct sctp_transport *); 1047 void sctp_transport_reset_timers(struct sctp_transport *); 1048 void sctp_transport_hold(struct sctp_transport *); 1049 void sctp_transport_put(struct sctp_transport *); 1050 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1051 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1052 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1053 unsigned long sctp_transport_timeout(struct sctp_transport *); 1054 void sctp_transport_reset(struct sctp_transport *); 1055 void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1056 1057 1058 /* This is the structure we use to queue packets as they come into 1059 * SCTP. We write packets to it and read chunks from it. 1060 */ 1061 struct sctp_inq { 1062 /* This is actually a queue of sctp_chunk each 1063 * containing a partially decoded packet. 1064 */ 1065 struct list_head in_chunk_list; 1066 /* This is the packet which is currently off the in queue and is 1067 * being worked on through the inbound chunk processing. 1068 */ 1069 struct sctp_chunk *in_progress; 1070 1071 /* This is the delayed task to finish delivering inbound 1072 * messages. 1073 */ 1074 struct work_struct immediate; 1075 1076 int malloced; /* Is this structure kfree()able? */ 1077 }; 1078 1079 void sctp_inq_init(struct sctp_inq *); 1080 void sctp_inq_free(struct sctp_inq *); 1081 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1082 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1083 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1084 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1085 1086 /* This is the structure we use to hold outbound chunks. You push 1087 * chunks in and they automatically pop out the other end as bundled 1088 * packets (it calls (*output_handler)()). 1089 * 1090 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1091 * and 8.2 of the v13 draft. 1092 * 1093 * It handles retransmissions. The connection to the timeout portion 1094 * of the state machine is through sctp_..._timeout() and timeout_handler. 1095 * 1096 * If you feed it SACKs, it will eat them. 1097 * 1098 * If you give it big chunks, it will fragment them. 1099 * 1100 * It assigns TSN's to data chunks. This happens at the last possible 1101 * instant before transmission. 1102 * 1103 * When free()'d, it empties itself out via output_handler(). 1104 */ 1105 struct sctp_outq { 1106 struct sctp_association *asoc; 1107 1108 /* Data pending that has never been transmitted. */ 1109 struct list_head out_chunk_list; 1110 1111 unsigned out_qlen; /* Total length of queued data chunks. */ 1112 1113 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1114 unsigned error; 1115 1116 /* These are control chunks we want to send. */ 1117 struct list_head control_chunk_list; 1118 1119 /* These are chunks that have been sacked but are above the 1120 * CTSN, or cumulative tsn ack point. 1121 */ 1122 struct list_head sacked; 1123 1124 /* Put chunks on this list to schedule them for 1125 * retransmission. 1126 */ 1127 struct list_head retransmit; 1128 1129 /* Put chunks on this list to save them for FWD TSN processing as 1130 * they were abandoned. 1131 */ 1132 struct list_head abandoned; 1133 1134 /* How many unackd bytes do we have in-flight? */ 1135 __u32 outstanding_bytes; 1136 1137 /* Corked? */ 1138 char cork; 1139 1140 /* Is this structure empty? */ 1141 char empty; 1142 1143 /* Are we kfree()able? */ 1144 char malloced; 1145 }; 1146 1147 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1148 void sctp_outq_teardown(struct sctp_outq *); 1149 void sctp_outq_free(struct sctp_outq*); 1150 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1151 int sctp_outq_flush(struct sctp_outq *, int); 1152 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1153 int sctp_outq_is_empty(const struct sctp_outq *); 1154 void sctp_outq_restart(struct sctp_outq *); 1155 1156 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1157 sctp_retransmit_reason_t); 1158 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1159 int sctp_outq_uncork(struct sctp_outq *); 1160 /* Uncork and flush an outqueue. */ 1161 static inline void sctp_outq_cork(struct sctp_outq *q) 1162 { 1163 q->cork = 1; 1164 } 1165 1166 /* These bind address data fields common between endpoints and associations */ 1167 struct sctp_bind_addr { 1168 1169 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1170 * 1171 * SCTP Port: The local SCTP port number the endpoint is 1172 * bound to. 1173 */ 1174 __u16 port; 1175 1176 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1177 * 1178 * Address List: The list of IP addresses that this instance 1179 * has bound. This information is passed to one's 1180 * peer(s) in INIT and INIT ACK chunks. 1181 */ 1182 struct list_head address_list; 1183 1184 int malloced; /* Are we kfree()able? */ 1185 }; 1186 1187 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1188 void sctp_bind_addr_free(struct sctp_bind_addr *); 1189 int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1190 const struct sctp_bind_addr *src, 1191 sctp_scope_t scope, gfp_t gfp, 1192 int flags); 1193 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1194 const struct sctp_bind_addr *src, 1195 gfp_t gfp); 1196 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1197 __u8 addr_state, gfp_t gfp); 1198 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1199 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1200 struct sctp_sock *); 1201 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1202 const union sctp_addr *addr); 1203 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1204 const union sctp_addr *addrs, 1205 int addrcnt, 1206 struct sctp_sock *opt); 1207 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1208 int *addrs_len, 1209 gfp_t gfp); 1210 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1211 __u16 port, gfp_t gfp); 1212 1213 sctp_scope_t sctp_scope(const union sctp_addr *); 1214 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1215 int sctp_is_any(const union sctp_addr *addr); 1216 int sctp_addr_is_valid(const union sctp_addr *addr); 1217 1218 1219 /* What type of endpoint? */ 1220 typedef enum { 1221 SCTP_EP_TYPE_SOCKET, 1222 SCTP_EP_TYPE_ASSOCIATION, 1223 } sctp_endpoint_type_t; 1224 1225 /* 1226 * A common base class to bridge the implmentation view of a 1227 * socket (usually listening) endpoint versus an association's 1228 * local endpoint. 1229 * This common structure is useful for several purposes: 1230 * 1) Common interface for lookup routines. 1231 * a) Subfunctions work for either endpoint or association 1232 * b) Single interface to lookup allows hiding the lookup lock rather 1233 * than acquiring it externally. 1234 * 2) Common interface for the inbound chunk handling/state machine. 1235 * 3) Common object handling routines for reference counting, etc. 1236 * 4) Disentangle association lookup from endpoint lookup, where we 1237 * do not have to find our endpoint to find our association. 1238 * 1239 */ 1240 1241 struct sctp_ep_common { 1242 /* Fields to help us manage our entries in the hash tables. */ 1243 struct hlist_node node; 1244 int hashent; 1245 1246 /* Runtime type information. What kind of endpoint is this? */ 1247 sctp_endpoint_type_t type; 1248 1249 /* Some fields to help us manage this object. 1250 * refcnt - Reference count access to this object. 1251 * dead - Do not attempt to use this object. 1252 * malloced - Do we need to kfree this object? 1253 */ 1254 atomic_t refcnt; 1255 char dead; 1256 char malloced; 1257 1258 /* What socket does this endpoint belong to? */ 1259 struct sock *sk; 1260 1261 /* This is where we receive inbound chunks. */ 1262 struct sctp_inq inqueue; 1263 1264 /* This substructure includes the defining parameters of the 1265 * endpoint: 1266 * bind_addr.port is our shared port number. 1267 * bind_addr.address_list is our set of local IP addresses. 1268 */ 1269 struct sctp_bind_addr bind_addr; 1270 }; 1271 1272 1273 /* RFC Section 1.4 Key Terms 1274 * 1275 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1276 * multi-homed host, an SCTP endpoint is represented to its peers as a 1277 * combination of a set of eligible destination transport addresses to 1278 * which SCTP packets can be sent and a set of eligible source 1279 * transport addresses from which SCTP packets can be received. 1280 * All transport addresses used by an SCTP endpoint must use the 1281 * same port number, but can use multiple IP addresses. A transport 1282 * address used by an SCTP endpoint must not be used by another 1283 * SCTP endpoint. In other words, a transport address is unique 1284 * to an SCTP endpoint. 1285 * 1286 * From an implementation perspective, each socket has one of these. 1287 * A TCP-style socket will have exactly one association on one of 1288 * these. An UDP-style socket will have multiple associations hanging 1289 * off one of these. 1290 */ 1291 1292 struct sctp_endpoint { 1293 /* Common substructure for endpoint and association. */ 1294 struct sctp_ep_common base; 1295 1296 /* Associations: A list of current associations and mappings 1297 * to the data consumers for each association. This 1298 * may be in the form of a hash table or other 1299 * implementation dependent structure. The data 1300 * consumers may be process identification 1301 * information such as file descriptors, named pipe 1302 * pointer, or table pointers dependent on how SCTP 1303 * is implemented. 1304 */ 1305 /* This is really a list of struct sctp_association entries. */ 1306 struct list_head asocs; 1307 1308 /* Secret Key: A secret key used by this endpoint to compute 1309 * the MAC. This SHOULD be a cryptographic quality 1310 * random number with a sufficient length. 1311 * Discussion in [RFC1750] can be helpful in 1312 * selection of the key. 1313 */ 1314 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1315 int current_key; 1316 int last_key; 1317 int key_changed_at; 1318 1319 /* digest: This is a digest of the sctp cookie. This field is 1320 * only used on the receive path when we try to validate 1321 * that the cookie has not been tampered with. We put 1322 * this here so we pre-allocate this once and can re-use 1323 * on every receive. 1324 */ 1325 __u8 *digest; 1326 1327 /* sendbuf acct. policy. */ 1328 __u32 sndbuf_policy; 1329 1330 /* rcvbuf acct. policy. */ 1331 __u32 rcvbuf_policy; 1332 1333 /* SCTP AUTH: array of the HMACs that will be allocated 1334 * we need this per association so that we don't serialize 1335 */ 1336 struct crypto_hash **auth_hmacs; 1337 1338 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1339 struct sctp_hmac_algo_param *auth_hmacs_list; 1340 1341 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1342 struct sctp_chunks_param *auth_chunk_list; 1343 1344 /* SCTP-AUTH: endpoint shared keys */ 1345 struct list_head endpoint_shared_keys; 1346 __u16 active_key_id; 1347 }; 1348 1349 /* Recover the outter endpoint structure. */ 1350 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1351 { 1352 struct sctp_endpoint *ep; 1353 1354 ep = container_of(base, struct sctp_endpoint, base); 1355 return ep; 1356 } 1357 1358 /* These are function signatures for manipulating endpoints. */ 1359 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1360 void sctp_endpoint_free(struct sctp_endpoint *); 1361 void sctp_endpoint_put(struct sctp_endpoint *); 1362 void sctp_endpoint_hold(struct sctp_endpoint *); 1363 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1364 struct sctp_association *sctp_endpoint_lookup_assoc( 1365 const struct sctp_endpoint *ep, 1366 const union sctp_addr *paddr, 1367 struct sctp_transport **); 1368 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1369 const union sctp_addr *); 1370 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1371 const union sctp_addr *); 1372 int sctp_has_association(const union sctp_addr *laddr, 1373 const union sctp_addr *paddr); 1374 1375 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1376 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1377 struct sctp_chunk **err_chunk); 1378 int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1379 const union sctp_addr *peer, 1380 sctp_init_chunk_t *init, gfp_t gfp); 1381 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1382 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1383 1384 struct sctp_inithdr_host { 1385 __u32 init_tag; 1386 __u32 a_rwnd; 1387 __u16 num_outbound_streams; 1388 __u16 num_inbound_streams; 1389 __u32 initial_tsn; 1390 }; 1391 1392 /* RFC2960 1393 * 1394 * 12. Recommended Transmission Control Block (TCB) Parameters 1395 * 1396 * This section details a recommended set of parameters that should 1397 * be contained within the TCB for an implementation. This section is 1398 * for illustrative purposes and should not be deemed as requirements 1399 * on an implementation or as an exhaustive list of all parameters 1400 * inside an SCTP TCB. Each implementation may need its own additional 1401 * parameters for optimization. 1402 */ 1403 1404 1405 /* Here we have information about each individual association. */ 1406 struct sctp_association { 1407 1408 /* A base structure common to endpoint and association. 1409 * In this context, it represents the associations's view 1410 * of the local endpoint of the association. 1411 */ 1412 struct sctp_ep_common base; 1413 1414 /* Associations on the same socket. */ 1415 struct list_head asocs; 1416 1417 /* association id. */ 1418 sctp_assoc_t assoc_id; 1419 1420 /* This is our parent endpoint. */ 1421 struct sctp_endpoint *ep; 1422 1423 /* These are those association elements needed in the cookie. */ 1424 struct sctp_cookie c; 1425 1426 /* This is all information about our peer. */ 1427 struct { 1428 /* rwnd 1429 * 1430 * Peer Rwnd : Current calculated value of the peer's rwnd. 1431 */ 1432 __u32 rwnd; 1433 1434 /* transport_addr_list 1435 * 1436 * Peer : A list of SCTP transport addresses that the 1437 * Transport : peer is bound to. This information is derived 1438 * Address : from the INIT or INIT ACK and is used to 1439 * List : associate an inbound packet with a given 1440 * : association. Normally this information is 1441 * : hashed or keyed for quick lookup and access 1442 * : of the TCB. 1443 * : The list is also initialized with the list 1444 * : of addresses passed with the sctp_connectx() 1445 * : call. 1446 * 1447 * It is a list of SCTP_transport's. 1448 */ 1449 struct list_head transport_addr_list; 1450 1451 /* transport_count 1452 * 1453 * Peer : A count of the number of peer addresses 1454 * Transport : in the Peer Transport Address List. 1455 * Address : 1456 * Count : 1457 */ 1458 __u16 transport_count; 1459 1460 /* port 1461 * The transport layer port number. 1462 */ 1463 __u16 port; 1464 1465 /* primary_path 1466 * 1467 * Primary : This is the current primary destination 1468 * Path : transport address of the peer endpoint. It 1469 * : may also specify a source transport address 1470 * : on this endpoint. 1471 * 1472 * All of these paths live on transport_addr_list. 1473 * 1474 * At the bakeoffs, we discovered that the intent of 1475 * primaryPath is that it only changes when the ULP 1476 * asks to have it changed. We add the activePath to 1477 * designate the connection we are currently using to 1478 * transmit new data and most control chunks. 1479 */ 1480 struct sctp_transport *primary_path; 1481 1482 /* Cache the primary path address here, when we 1483 * need a an address for msg_name. 1484 */ 1485 union sctp_addr primary_addr; 1486 1487 /* active_path 1488 * The path that we are currently using to 1489 * transmit new data and most control chunks. 1490 */ 1491 struct sctp_transport *active_path; 1492 1493 /* retran_path 1494 * 1495 * RFC2960 6.4 Multi-homed SCTP Endpoints 1496 * ... 1497 * Furthermore, when its peer is multi-homed, an 1498 * endpoint SHOULD try to retransmit a chunk to an 1499 * active destination transport address that is 1500 * different from the last destination address to 1501 * which the DATA chunk was sent. 1502 */ 1503 struct sctp_transport *retran_path; 1504 1505 /* Pointer to last transport I have sent on. */ 1506 struct sctp_transport *last_sent_to; 1507 1508 /* This is the last transport I have received DATA on. */ 1509 struct sctp_transport *last_data_from; 1510 1511 /* 1512 * Mapping An array of bits or bytes indicating which out of 1513 * Array order TSN's have been received (relative to the 1514 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1515 * order packets have been received, this array 1516 * will be set to all zero. This structure may be 1517 * in the form of a circular buffer or bit array. 1518 * 1519 * Last Rcvd : This is the last TSN received in 1520 * TSN : sequence. This value is set initially by 1521 * : taking the peer's Initial TSN, received in 1522 * : the INIT or INIT ACK chunk, and subtracting 1523 * : one from it. 1524 * 1525 * Throughout most of the specification this is called the 1526 * "Cumulative TSN ACK Point". In this case, we 1527 * ignore the advice in 12.2 in favour of the term 1528 * used in the bulk of the text. This value is hidden 1529 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1530 */ 1531 struct sctp_tsnmap tsn_map; 1532 __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; 1533 1534 /* Ack State : This flag indicates if the next received 1535 * : packet is to be responded to with a 1536 * : SACK. This is initializedto 0. When a packet 1537 * : is received it is incremented. If this value 1538 * : reaches 2 or more, a SACK is sent and the 1539 * : value is reset to 0. Note: This is used only 1540 * : when no DATA chunks are received out of 1541 * : order. When DATA chunks are out of order, 1542 * : SACK's are not delayed (see Section 6). 1543 */ 1544 __u8 sack_needed; /* Do we need to sack the peer? */ 1545 1546 /* These are capabilities which our peer advertised. */ 1547 __u8 ecn_capable; /* Can peer do ECN? */ 1548 __u8 ipv4_address; /* Peer understands IPv4 addresses? */ 1549 __u8 ipv6_address; /* Peer understands IPv6 addresses? */ 1550 __u8 hostname_address;/* Peer understands DNS addresses? */ 1551 __u8 asconf_capable; /* Does peer support ADDIP? */ 1552 __u8 prsctp_capable; /* Can peer do PR-SCTP? */ 1553 __u8 auth_capable; /* Is peer doing SCTP-AUTH? */ 1554 1555 __u32 adaptation_ind; /* Adaptation Code point. */ 1556 1557 /* This mask is used to disable sending the ASCONF chunk 1558 * with specified parameter to peer. 1559 */ 1560 __be16 addip_disabled_mask; 1561 1562 struct sctp_inithdr_host i; 1563 int cookie_len; 1564 void *cookie; 1565 1566 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1567 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1568 * Initial TSN Value minus 1 1569 */ 1570 __u32 addip_serial; 1571 1572 /* SCTP-AUTH: We need to know pears random number, hmac list 1573 * and authenticated chunk list. All that is part of the 1574 * cookie and these are just pointers to those locations 1575 */ 1576 sctp_random_param_t *peer_random; 1577 sctp_chunks_param_t *peer_chunks; 1578 sctp_hmac_algo_param_t *peer_hmacs; 1579 } peer; 1580 1581 /* State : A state variable indicating what state the 1582 * : association is in, i.e. COOKIE-WAIT, 1583 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1584 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1585 * 1586 * Note: No "CLOSED" state is illustrated since if a 1587 * association is "CLOSED" its TCB SHOULD be removed. 1588 * 1589 * In this implementation we DO have a CLOSED 1590 * state which is used during initiation and shutdown. 1591 * 1592 * State takes values from SCTP_STATE_*. 1593 */ 1594 sctp_state_t state; 1595 1596 /* The cookie life I award for any cookie. */ 1597 struct timeval cookie_life; 1598 1599 /* Overall : The overall association error count. 1600 * Error Count : [Clear this any time I get something.] 1601 */ 1602 int overall_error_count; 1603 1604 /* These are the association's initial, max, and min RTO values. 1605 * These values will be initialized by system defaults, but can 1606 * be modified via the SCTP_RTOINFO socket option. 1607 */ 1608 unsigned long rto_initial; 1609 unsigned long rto_max; 1610 unsigned long rto_min; 1611 1612 /* Maximum number of new data packets that can be sent in a burst. */ 1613 int max_burst; 1614 1615 /* This is the max_retrans value for the association. This value will 1616 * be initialized initialized from system defaults, but can be 1617 * modified by the SCTP_ASSOCINFO socket option. 1618 */ 1619 int max_retrans; 1620 1621 /* Maximum number of times the endpoint will retransmit INIT */ 1622 __u16 max_init_attempts; 1623 1624 /* How many times have we resent an INIT? */ 1625 __u16 init_retries; 1626 1627 /* The largest timeout or RTO value to use in attempting an INIT */ 1628 unsigned long max_init_timeo; 1629 1630 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1631 * the destination address every heartbeat interval. This value 1632 * will be inherited by all new transports. 1633 */ 1634 unsigned long hbinterval; 1635 1636 /* This is the max_retrans value for new transports in the 1637 * association. 1638 */ 1639 __u16 pathmaxrxt; 1640 1641 /* Flag that path mtu update is pending */ 1642 __u8 pmtu_pending; 1643 1644 /* Association : The smallest PMTU discovered for all of the 1645 * PMTU : peer's transport addresses. 1646 */ 1647 __u32 pathmtu; 1648 1649 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1650 __u32 param_flags; 1651 1652 /* SACK delay timeout */ 1653 unsigned long sackdelay; 1654 1655 1656 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1657 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1658 1659 /* Transport to which SHUTDOWN chunk was last sent. */ 1660 struct sctp_transport *shutdown_last_sent_to; 1661 1662 /* How many times have we resent a SHUTDOWN */ 1663 int shutdown_retries; 1664 1665 /* Transport to which INIT chunk was last sent. */ 1666 struct sctp_transport *init_last_sent_to; 1667 1668 /* Next TSN : The next TSN number to be assigned to a new 1669 * : DATA chunk. This is sent in the INIT or INIT 1670 * : ACK chunk to the peer and incremented each 1671 * : time a DATA chunk is assigned a TSN 1672 * : (normally just prior to transmit or during 1673 * : fragmentation). 1674 */ 1675 __u32 next_tsn; 1676 1677 /* 1678 * Last Rcvd : This is the last TSN received in sequence. This value 1679 * TSN : is set initially by taking the peer's Initial TSN, 1680 * : received in the INIT or INIT ACK chunk, and 1681 * : subtracting one from it. 1682 * 1683 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1684 */ 1685 1686 __u32 ctsn_ack_point; 1687 1688 /* PR-SCTP Advanced.Peer.Ack.Point */ 1689 __u32 adv_peer_ack_point; 1690 1691 /* Highest TSN that is acknowledged by incoming SACKs. */ 1692 __u32 highest_sacked; 1693 1694 /* The number of unacknowledged data chunks. Reported through 1695 * the SCTP_STATUS sockopt. 1696 */ 1697 __u16 unack_data; 1698 1699 /* The total number of data chunks that we've had to retransmit 1700 * as the result of a T3 timer expiration 1701 */ 1702 __u32 rtx_data_chunks; 1703 1704 /* This is the association's receive buffer space. This value is used 1705 * to set a_rwnd field in an INIT or a SACK chunk. 1706 */ 1707 __u32 rwnd; 1708 1709 /* This is the last advertised value of rwnd over a SACK chunk. */ 1710 __u32 a_rwnd; 1711 1712 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1713 * to slop over a maximum of the association's frag_point. 1714 */ 1715 __u32 rwnd_over; 1716 1717 /* This is the sndbuf size in use for the association. 1718 * This corresponds to the sndbuf size for the association, 1719 * as specified in the sk->sndbuf. 1720 */ 1721 int sndbuf_used; 1722 1723 /* This is the amount of memory that this association has allocated 1724 * in the receive path at any given time. 1725 */ 1726 atomic_t rmem_alloc; 1727 1728 /* This is the wait queue head for send requests waiting on 1729 * the association sndbuf space. 1730 */ 1731 wait_queue_head_t wait; 1732 1733 /* The message size at which SCTP fragmentation will occur. */ 1734 __u32 frag_point; 1735 1736 /* Counter used to count INIT errors. */ 1737 int init_err_counter; 1738 1739 /* Count the number of INIT cycles (for doubling timeout). */ 1740 int init_cycle; 1741 1742 /* Default send parameters. */ 1743 __u16 default_stream; 1744 __u16 default_flags; 1745 __u32 default_ppid; 1746 __u32 default_context; 1747 __u32 default_timetolive; 1748 1749 /* Default receive parameters */ 1750 __u32 default_rcv_context; 1751 1752 /* This tracks outbound ssn for a given stream. */ 1753 struct sctp_ssnmap *ssnmap; 1754 1755 /* All outbound chunks go through this structure. */ 1756 struct sctp_outq outqueue; 1757 1758 /* A smart pipe that will handle reordering and fragmentation, 1759 * as well as handle passing events up to the ULP. 1760 */ 1761 struct sctp_ulpq ulpq; 1762 1763 /* Last TSN that caused an ECNE Chunk to be sent. */ 1764 __u32 last_ecne_tsn; 1765 1766 /* Last TSN that caused a CWR Chunk to be sent. */ 1767 __u32 last_cwr_tsn; 1768 1769 /* How many duplicated TSNs have we seen? */ 1770 int numduptsns; 1771 1772 /* Number of seconds of idle time before an association is closed. 1773 * In the association context, this is really used as a boolean 1774 * since the real timeout is stored in the timeouts array 1775 */ 1776 __u32 autoclose; 1777 1778 /* These are to support 1779 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1780 * and Enforcement of Flow and Message Limits" 1781 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1782 * or "ADDIP" for short. 1783 */ 1784 1785 1786 1787 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1788 * 1789 * R1) One and only one ASCONF Chunk MAY be in transit and 1790 * unacknowledged at any one time. If a sender, after sending 1791 * an ASCONF chunk, decides it needs to transfer another 1792 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1793 * returns from the previous ASCONF Chunk before sending a 1794 * subsequent ASCONF. Note this restriction binds each side, 1795 * so at any time two ASCONF may be in-transit on any given 1796 * association (one sent from each endpoint). 1797 * 1798 * [This is our one-and-only-one ASCONF in flight. If we do 1799 * not have an ASCONF in flight, this is NULL.] 1800 */ 1801 struct sctp_chunk *addip_last_asconf; 1802 1803 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1804 * 1805 * This is needed to implement itmes E1 - E4 of the updated 1806 * spec. Here is the justification: 1807 * 1808 * Since the peer may bundle multiple ASCONF chunks toward us, 1809 * we now need the ability to cache multiple ACKs. The section 1810 * describes in detail how they are cached and cleaned up. 1811 */ 1812 struct list_head asconf_ack_list; 1813 1814 /* These ASCONF chunks are waiting to be sent. 1815 * 1816 * These chunaks can't be pushed to outqueue until receiving 1817 * ASCONF_ACK for the previous ASCONF indicated by 1818 * addip_last_asconf, so as to guarantee that only one ASCONF 1819 * is in flight at any time. 1820 * 1821 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1822 * 1823 * In defining the ASCONF Chunk transfer procedures, it is 1824 * essential that these transfers MUST NOT cause congestion 1825 * within the network. To achieve this, we place these 1826 * restrictions on the transfer of ASCONF Chunks: 1827 * 1828 * R1) One and only one ASCONF Chunk MAY be in transit and 1829 * unacknowledged at any one time. If a sender, after sending 1830 * an ASCONF chunk, decides it needs to transfer another 1831 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1832 * returns from the previous ASCONF Chunk before sending a 1833 * subsequent ASCONF. Note this restriction binds each side, 1834 * so at any time two ASCONF may be in-transit on any given 1835 * association (one sent from each endpoint). 1836 * 1837 * 1838 * [I really think this is EXACTLY the sort of intelligence 1839 * which already resides in sctp_outq. Please move this 1840 * queue and its supporting logic down there. --piggy] 1841 */ 1842 struct list_head addip_chunk_list; 1843 1844 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1845 * 1846 * A2) A serial number should be assigned to the Chunk. The 1847 * serial number SHOULD be a monotonically increasing 1848 * number. The serial number SHOULD be initialized at 1849 * the start of the association to the same value as the 1850 * Initial TSN and every time a new ASCONF chunk is created 1851 * it is incremented by one after assigning the serial number 1852 * to the newly created chunk. 1853 * 1854 * ADDIP 1855 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1856 * 1857 * Serial Number : 32 bits (unsigned integer) 1858 * 1859 * This value represents a Serial Number for the ASCONF 1860 * Chunk. The valid range of Serial Number is from 0 to 1861 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1862 * after reaching 4294967295. 1863 */ 1864 __u32 addip_serial; 1865 1866 /* SCTP AUTH: list of the endpoint shared keys. These 1867 * keys are provided out of band by the user applicaton 1868 * and can't change during the lifetime of the association 1869 */ 1870 struct list_head endpoint_shared_keys; 1871 1872 /* SCTP AUTH: 1873 * The current generated assocaition shared key (secret) 1874 */ 1875 struct sctp_auth_bytes *asoc_shared_key; 1876 1877 /* SCTP AUTH: hmac id of the first peer requested algorithm 1878 * that we support. 1879 */ 1880 __u16 default_hmac_id; 1881 1882 __u16 active_key_id; 1883 1884 /* Need to send an ECNE Chunk? */ 1885 char need_ecne; 1886 1887 /* Is it a temporary association? */ 1888 char temp; 1889 }; 1890 1891 1892 /* An eyecatcher for determining if we are really looking at an 1893 * association data structure. 1894 */ 1895 enum { 1896 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1897 }; 1898 1899 /* Recover the outter association structure. */ 1900 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1901 { 1902 struct sctp_association *asoc; 1903 1904 asoc = container_of(base, struct sctp_association, base); 1905 return asoc; 1906 } 1907 1908 /* These are function signatures for manipulating associations. */ 1909 1910 1911 struct sctp_association * 1912 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1913 sctp_scope_t scope, gfp_t gfp); 1914 void sctp_association_free(struct sctp_association *); 1915 void sctp_association_put(struct sctp_association *); 1916 void sctp_association_hold(struct sctp_association *); 1917 1918 struct sctp_transport *sctp_assoc_choose_init_transport( 1919 struct sctp_association *); 1920 struct sctp_transport *sctp_assoc_choose_shutdown_transport( 1921 struct sctp_association *); 1922 void sctp_assoc_update_retran_path(struct sctp_association *); 1923 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1924 const union sctp_addr *); 1925 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1926 const union sctp_addr *laddr); 1927 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1928 const union sctp_addr *address, 1929 const gfp_t gfp, 1930 const int peer_state); 1931 void sctp_assoc_del_peer(struct sctp_association *asoc, 1932 const union sctp_addr *addr); 1933 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1934 struct sctp_transport *peer); 1935 void sctp_assoc_control_transport(struct sctp_association *, 1936 struct sctp_transport *, 1937 sctp_transport_cmd_t, sctp_sn_error_t); 1938 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1939 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1940 const union sctp_addr *, 1941 const union sctp_addr *); 1942 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1943 void sctp_assoc_update(struct sctp_association *old, 1944 struct sctp_association *new); 1945 1946 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1947 1948 void sctp_assoc_sync_pmtu(struct sctp_association *); 1949 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1950 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1951 void sctp_assoc_set_primary(struct sctp_association *, 1952 struct sctp_transport *); 1953 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1954 struct sctp_transport *); 1955 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1956 gfp_t); 1957 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1958 struct sctp_cookie*, 1959 gfp_t gfp); 1960 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1961 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1962 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1963 const struct sctp_association *asoc, 1964 __be32 serial); 1965 1966 1967 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1968 const union sctp_addr *ss2); 1969 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1970 1971 /* A convenience structure to parse out SCTP specific CMSGs. */ 1972 typedef struct sctp_cmsgs { 1973 struct sctp_initmsg *init; 1974 struct sctp_sndrcvinfo *info; 1975 } sctp_cmsgs_t; 1976 1977 /* Structure for tracking memory objects */ 1978 typedef struct { 1979 char *label; 1980 atomic_t *counter; 1981 } sctp_dbg_objcnt_entry_t; 1982 1983 #endif /* __sctp_structs_h__ */ 1984