1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * This SCTP implementation is free software; 10 * you can redistribute it and/or modify it under the terms of 11 * the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This SCTP implementation is distributed in the hope that it 16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 17 * ************************ 18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 19 * See the GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with GNU CC; see the file COPYING. If not, write to 23 * the Free Software Foundation, 59 Temple Place - Suite 330, 24 * Boston, MA 02111-1307, USA. 25 * 26 * Please send any bug reports or fixes you make to the 27 * email addresses: 28 * lksctp developers <lksctp-developers@lists.sourceforge.net> 29 * 30 * Or submit a bug report through the following website: 31 * http://www.sf.net/projects/lksctp 32 * 33 * Written or modified by: 34 * Randall Stewart <randall@sctp.chicago.il.us> 35 * Ken Morneau <kmorneau@cisco.com> 36 * Qiaobing Xie <qxie1@email.mot.com> 37 * La Monte H.P. Yarroll <piggy@acm.org> 38 * Karl Knutson <karl@athena.chicago.il.us> 39 * Jon Grimm <jgrimm@us.ibm.com> 40 * Xingang Guo <xingang.guo@intel.com> 41 * Hui Huang <hui.huang@nokia.com> 42 * Sridhar Samudrala <sri@us.ibm.com> 43 * Daisy Chang <daisyc@us.ibm.com> 44 * Dajiang Zhang <dajiang.zhang@nokia.com> 45 * Ardelle Fan <ardelle.fan@intel.com> 46 * Ryan Layer <rmlayer@us.ibm.com> 47 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 48 * Kevin Gao <kevin.gao@intel.com> 49 * 50 * Any bugs reported given to us we will try to fix... any fixes shared will 51 * be incorporated into the next SCTP release. 52 */ 53 54 #ifndef __sctp_structs_h__ 55 #define __sctp_structs_h__ 56 57 #include <linux/time.h> /* We get struct timespec. */ 58 #include <linux/socket.h> /* linux/in.h needs this!! */ 59 #include <linux/in.h> /* We get struct sockaddr_in. */ 60 #include <linux/in6.h> /* We get struct in6_addr */ 61 #include <linux/ipv6.h> 62 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 63 #include <asm/atomic.h> /* This gets us atomic counters. */ 64 #include <linux/skbuff.h> /* We need sk_buff_head. */ 65 #include <linux/workqueue.h> /* We need tq_struct. */ 66 #include <linux/sctp.h> /* We need sctp* header structs. */ 67 #include <net/sctp/auth.h> /* We need auth specific structs */ 68 69 /* A convenience structure for handling sockaddr structures. 70 * We should wean ourselves off this. 71 */ 72 union sctp_addr { 73 struct sockaddr_in v4; 74 struct sockaddr_in6 v6; 75 struct sockaddr sa; 76 }; 77 78 /* Forward declarations for data structures. */ 79 struct sctp_globals; 80 struct sctp_endpoint; 81 struct sctp_association; 82 struct sctp_transport; 83 struct sctp_packet; 84 struct sctp_chunk; 85 struct sctp_inq; 86 struct sctp_outq; 87 struct sctp_bind_addr; 88 struct sctp_ulpq; 89 struct sctp_ep_common; 90 struct sctp_ssnmap; 91 struct crypto_hash; 92 93 94 #include <net/sctp/tsnmap.h> 95 #include <net/sctp/ulpevent.h> 96 #include <net/sctp/ulpqueue.h> 97 98 /* Structures useful for managing bind/connect. */ 99 100 struct sctp_bind_bucket { 101 unsigned short port; 102 unsigned short fastreuse; 103 struct hlist_node node; 104 struct hlist_head owner; 105 }; 106 107 struct sctp_bind_hashbucket { 108 spinlock_t lock; 109 struct hlist_head chain; 110 }; 111 112 /* Used for hashing all associations. */ 113 struct sctp_hashbucket { 114 rwlock_t lock; 115 struct hlist_head chain; 116 } __attribute__((__aligned__(8))); 117 118 119 /* The SCTP globals structure. */ 120 extern struct sctp_globals { 121 /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values 122 * 123 * The following protocol parameters are RECOMMENDED: 124 * 125 * RTO.Initial - 3 seconds 126 * RTO.Min - 1 second 127 * RTO.Max - 60 seconds 128 * RTO.Alpha - 1/8 (3 when converted to right shifts.) 129 * RTO.Beta - 1/4 (2 when converted to right shifts.) 130 */ 131 unsigned int rto_initial; 132 unsigned int rto_min; 133 unsigned int rto_max; 134 135 /* Note: rto_alpha and rto_beta are really defined as inverse 136 * powers of two to facilitate integer operations. 137 */ 138 int rto_alpha; 139 int rto_beta; 140 141 /* Max.Burst - 4 */ 142 int max_burst; 143 144 /* Whether Cookie Preservative is enabled(1) or not(0) */ 145 int cookie_preserve_enable; 146 147 /* Valid.Cookie.Life - 60 seconds */ 148 unsigned int valid_cookie_life; 149 150 /* Delayed SACK timeout 200ms default*/ 151 unsigned int sack_timeout; 152 153 /* HB.interval - 30 seconds */ 154 unsigned int hb_interval; 155 156 /* Association.Max.Retrans - 10 attempts 157 * Path.Max.Retrans - 5 attempts (per destination address) 158 * Max.Init.Retransmits - 8 attempts 159 */ 160 int max_retrans_association; 161 int max_retrans_path; 162 int max_retrans_init; 163 164 /* 165 * Policy for preforming sctp/socket accounting 166 * 0 - do socket level accounting, all assocs share sk_sndbuf 167 * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes 168 */ 169 int sndbuf_policy; 170 171 /* 172 * Policy for preforming sctp/socket accounting 173 * 0 - do socket level accounting, all assocs share sk_rcvbuf 174 * 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes 175 */ 176 int rcvbuf_policy; 177 178 /* The following variables are implementation specific. */ 179 180 /* Default initialization values to be applied to new associations. */ 181 __u16 max_instreams; 182 __u16 max_outstreams; 183 184 /* This is a list of groups of functions for each address 185 * family that we support. 186 */ 187 struct list_head address_families; 188 189 /* This is the hash of all endpoints. */ 190 int ep_hashsize; 191 struct sctp_hashbucket *ep_hashtable; 192 193 /* This is the hash of all associations. */ 194 int assoc_hashsize; 195 struct sctp_hashbucket *assoc_hashtable; 196 197 /* This is the sctp port control hash. */ 198 int port_hashsize; 199 struct sctp_bind_hashbucket *port_hashtable; 200 201 /* This is the global local address list. 202 * We actively maintain this complete list of addresses on 203 * the system by catching address add/delete events. 204 * 205 * It is a list of sctp_sockaddr_entry. 206 */ 207 struct list_head local_addr_list; 208 209 /* Lock that protects the local_addr_list writers */ 210 spinlock_t addr_list_lock; 211 212 /* Flag to indicate if addip is enabled. */ 213 int addip_enable; 214 int addip_noauth_enable; 215 216 /* Flag to indicate if PR-SCTP is enabled. */ 217 int prsctp_enable; 218 219 /* Flag to idicate if SCTP-AUTH is enabled */ 220 int auth_enable; 221 222 /* 223 * Policy to control SCTP IPv4 address scoping 224 * 0 - Disable IPv4 address scoping 225 * 1 - Enable IPv4 address scoping 226 * 2 - Selectively allow only IPv4 private addresses 227 * 3 - Selectively allow only IPv4 link local address 228 */ 229 int ipv4_scope_policy; 230 231 /* Flag to indicate whether computing and verifying checksum 232 * is disabled. */ 233 int checksum_disable; 234 235 /* Threshold for rwnd update SACKS. Receive buffer shifted this many 236 * bits is an indicator of when to send and window update SACK. 237 */ 238 int rwnd_update_shift; 239 } sctp_globals; 240 241 #define sctp_rto_initial (sctp_globals.rto_initial) 242 #define sctp_rto_min (sctp_globals.rto_min) 243 #define sctp_rto_max (sctp_globals.rto_max) 244 #define sctp_rto_alpha (sctp_globals.rto_alpha) 245 #define sctp_rto_beta (sctp_globals.rto_beta) 246 #define sctp_max_burst (sctp_globals.max_burst) 247 #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) 248 #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) 249 #define sctp_max_retrans_association (sctp_globals.max_retrans_association) 250 #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) 251 #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) 252 #define sctp_max_retrans_path (sctp_globals.max_retrans_path) 253 #define sctp_max_retrans_init (sctp_globals.max_retrans_init) 254 #define sctp_sack_timeout (sctp_globals.sack_timeout) 255 #define sctp_hb_interval (sctp_globals.hb_interval) 256 #define sctp_max_instreams (sctp_globals.max_instreams) 257 #define sctp_max_outstreams (sctp_globals.max_outstreams) 258 #define sctp_address_families (sctp_globals.address_families) 259 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 260 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 261 #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) 262 #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) 263 #define sctp_port_hashsize (sctp_globals.port_hashsize) 264 #define sctp_port_rover (sctp_globals.port_rover) 265 #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) 266 #define sctp_port_hashtable (sctp_globals.port_hashtable) 267 #define sctp_local_addr_list (sctp_globals.local_addr_list) 268 #define sctp_local_addr_lock (sctp_globals.addr_list_lock) 269 #define sctp_scope_policy (sctp_globals.ipv4_scope_policy) 270 #define sctp_addip_enable (sctp_globals.addip_enable) 271 #define sctp_addip_noauth (sctp_globals.addip_noauth_enable) 272 #define sctp_prsctp_enable (sctp_globals.prsctp_enable) 273 #define sctp_auth_enable (sctp_globals.auth_enable) 274 #define sctp_checksum_disable (sctp_globals.checksum_disable) 275 #define sctp_rwnd_upd_shift (sctp_globals.rwnd_update_shift) 276 277 /* SCTP Socket type: UDP or TCP style. */ 278 typedef enum { 279 SCTP_SOCKET_UDP = 0, 280 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 281 SCTP_SOCKET_TCP 282 } sctp_socket_type_t; 283 284 /* Per socket SCTP information. */ 285 struct sctp_sock { 286 /* inet_sock has to be the first member of sctp_sock */ 287 struct inet_sock inet; 288 /* What kind of a socket is this? */ 289 sctp_socket_type_t type; 290 291 /* PF_ family specific functions. */ 292 struct sctp_pf *pf; 293 294 /* Access to HMAC transform. */ 295 struct crypto_hash *hmac; 296 297 /* What is our base endpointer? */ 298 struct sctp_endpoint *ep; 299 300 struct sctp_bind_bucket *bind_hash; 301 /* Various Socket Options. */ 302 __u16 default_stream; 303 __u32 default_ppid; 304 __u16 default_flags; 305 __u32 default_context; 306 __u32 default_timetolive; 307 __u32 default_rcv_context; 308 int max_burst; 309 310 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 311 * the destination address every heartbeat interval. This value 312 * will be inherited by all new associations. 313 */ 314 __u32 hbinterval; 315 316 /* This is the max_retrans value for new associations. */ 317 __u16 pathmaxrxt; 318 319 /* The initial Path MTU to use for new associations. */ 320 __u32 pathmtu; 321 322 /* The default SACK delay timeout for new associations. */ 323 __u32 sackdelay; 324 __u32 sackfreq; 325 326 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 327 __u32 param_flags; 328 329 struct sctp_initmsg initmsg; 330 struct sctp_rtoinfo rtoinfo; 331 struct sctp_paddrparams paddrparam; 332 struct sctp_event_subscribe subscribe; 333 struct sctp_assocparams assocparams; 334 int user_frag; 335 __u32 autoclose; 336 __u8 nodelay; 337 __u8 disable_fragments; 338 __u8 v4mapped; 339 __u8 frag_interleave; 340 __u32 adaptation_ind; 341 __u32 pd_point; 342 343 atomic_t pd_mode; 344 /* Receive to here while partial delivery is in effect. */ 345 struct sk_buff_head pd_lobby; 346 }; 347 348 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 349 { 350 return (struct sctp_sock *)sk; 351 } 352 353 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 354 { 355 return (struct sock *)sp; 356 } 357 358 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 359 struct sctp6_sock { 360 struct sctp_sock sctp; 361 struct ipv6_pinfo inet6; 362 }; 363 #endif /* CONFIG_IPV6 */ 364 365 366 /* This is our APPLICATION-SPECIFIC state cookie. 367 * THIS IS NOT DICTATED BY THE SPECIFICATION. 368 */ 369 /* These are the parts of an association which we send in the cookie. 370 * Most of these are straight out of: 371 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 372 * 373 */ 374 375 struct sctp_cookie { 376 377 /* My : Tag expected in every inbound packet and sent 378 * Verification: in the INIT or INIT ACK chunk. 379 * Tag : 380 */ 381 __u32 my_vtag; 382 383 /* Peer's : Tag expected in every outbound packet except 384 * Verification: in the INIT chunk. 385 * Tag : 386 */ 387 __u32 peer_vtag; 388 389 /* The rest of these are not from the spec, but really need to 390 * be in the cookie. 391 */ 392 393 /* My Tie Tag : Assist in discovering a restarting association. */ 394 __u32 my_ttag; 395 396 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 397 __u32 peer_ttag; 398 399 /* When does this cookie expire? */ 400 struct timeval expiration; 401 402 /* Number of inbound/outbound streams which are set 403 * and negotiated during the INIT process. 404 */ 405 __u16 sinit_num_ostreams; 406 __u16 sinit_max_instreams; 407 408 /* This is the first sequence number I used. */ 409 __u32 initial_tsn; 410 411 /* This holds the originating address of the INIT packet. */ 412 union sctp_addr peer_addr; 413 414 /* IG Section 2.35.3 415 * Include the source port of the INIT-ACK 416 */ 417 __u16 my_port; 418 419 __u8 prsctp_capable; 420 421 /* Padding for future use */ 422 __u8 padding; 423 424 __u32 adaptation_ind; 425 426 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 427 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 428 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 429 430 /* This is a shim for my peer's INIT packet, followed by 431 * a copy of the raw address list of the association. 432 * The length of the raw address list is saved in the 433 * raw_addr_list_len field, which will be used at the time when 434 * the association TCB is re-constructed from the cookie. 435 */ 436 __u32 raw_addr_list_len; 437 struct sctp_init_chunk peer_init[0]; 438 }; 439 440 441 /* The format of our cookie that we send to our peer. */ 442 struct sctp_signed_cookie { 443 __u8 signature[SCTP_SECRET_SIZE]; 444 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 445 struct sctp_cookie c; 446 } __attribute__((packed)); 447 448 /* This is another convenience type to allocate memory for address 449 * params for the maximum size and pass such structures around 450 * internally. 451 */ 452 union sctp_addr_param { 453 struct sctp_paramhdr p; 454 struct sctp_ipv4addr_param v4; 455 struct sctp_ipv6addr_param v6; 456 }; 457 458 /* A convenience type to allow walking through the various 459 * parameters and avoid casting all over the place. 460 */ 461 union sctp_params { 462 void *v; 463 struct sctp_paramhdr *p; 464 struct sctp_cookie_preserve_param *life; 465 struct sctp_hostname_param *dns; 466 struct sctp_cookie_param *cookie; 467 struct sctp_supported_addrs_param *sat; 468 struct sctp_ipv4addr_param *v4; 469 struct sctp_ipv6addr_param *v6; 470 union sctp_addr_param *addr; 471 struct sctp_adaptation_ind_param *aind; 472 struct sctp_supported_ext_param *ext; 473 struct sctp_random_param *random; 474 struct sctp_chunks_param *chunks; 475 struct sctp_hmac_algo_param *hmac_algo; 476 struct sctp_addip_param *addip; 477 }; 478 479 /* RFC 2960. Section 3.3.5 Heartbeat. 480 * Heartbeat Information: variable length 481 * The Sender-specific Heartbeat Info field should normally include 482 * information about the sender's current time when this HEARTBEAT 483 * chunk is sent and the destination transport address to which this 484 * HEARTBEAT is sent (see Section 8.3). 485 */ 486 typedef struct sctp_sender_hb_info { 487 struct sctp_paramhdr param_hdr; 488 union sctp_addr daddr; 489 unsigned long sent_at; 490 __u64 hb_nonce; 491 } __attribute__((packed)) sctp_sender_hb_info_t; 492 493 /* 494 * RFC 2960 1.3.2 Sequenced Delivery within Streams 495 * 496 * The term "stream" is used in SCTP to refer to a sequence of user 497 * messages that are to be delivered to the upper-layer protocol in 498 * order with respect to other messages within the same stream. This is 499 * in contrast to its usage in TCP, where it refers to a sequence of 500 * bytes (in this document a byte is assumed to be eight bits). 501 * ... 502 * 503 * This is the structure we use to track both our outbound and inbound 504 * SSN, or Stream Sequence Numbers. 505 */ 506 507 struct sctp_stream { 508 __u16 *ssn; 509 unsigned int len; 510 }; 511 512 struct sctp_ssnmap { 513 struct sctp_stream in; 514 struct sctp_stream out; 515 int malloced; 516 }; 517 518 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 519 gfp_t gfp); 520 void sctp_ssnmap_free(struct sctp_ssnmap *map); 521 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 522 523 /* What is the current SSN number for this stream? */ 524 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 525 { 526 return stream->ssn[id]; 527 } 528 529 /* Return the next SSN number for this stream. */ 530 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 531 { 532 return stream->ssn[id]++; 533 } 534 535 /* Skip over this ssn and all below. */ 536 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 537 __u16 ssn) 538 { 539 stream->ssn[id] = ssn+1; 540 } 541 542 /* 543 * Pointers to address related SCTP functions. 544 * (i.e. things that depend on the address family.) 545 */ 546 struct sctp_af { 547 int (*sctp_xmit) (struct sk_buff *skb, 548 struct sctp_transport *); 549 int (*setsockopt) (struct sock *sk, 550 int level, 551 int optname, 552 char __user *optval, 553 unsigned int optlen); 554 int (*getsockopt) (struct sock *sk, 555 int level, 556 int optname, 557 char __user *optval, 558 int __user *optlen); 559 int (*compat_setsockopt) (struct sock *sk, 560 int level, 561 int optname, 562 char __user *optval, 563 unsigned int optlen); 564 int (*compat_getsockopt) (struct sock *sk, 565 int level, 566 int optname, 567 char __user *optval, 568 int __user *optlen); 569 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 570 union sctp_addr *daddr, 571 union sctp_addr *saddr); 572 void (*get_saddr) (struct sctp_sock *sk, 573 struct sctp_association *asoc, 574 struct dst_entry *dst, 575 union sctp_addr *daddr, 576 union sctp_addr *saddr); 577 void (*copy_addrlist) (struct list_head *, 578 struct net_device *); 579 void (*dst_saddr) (union sctp_addr *saddr, 580 struct dst_entry *dst, 581 __be16 port); 582 int (*cmp_addr) (const union sctp_addr *addr1, 583 const union sctp_addr *addr2); 584 void (*addr_copy) (union sctp_addr *dst, 585 union sctp_addr *src); 586 void (*from_skb) (union sctp_addr *, 587 struct sk_buff *skb, 588 int saddr); 589 void (*from_sk) (union sctp_addr *, 590 struct sock *sk); 591 void (*to_sk_saddr) (union sctp_addr *, 592 struct sock *sk); 593 void (*to_sk_daddr) (union sctp_addr *, 594 struct sock *sk); 595 void (*from_addr_param) (union sctp_addr *, 596 union sctp_addr_param *, 597 __be16 port, int iif); 598 int (*to_addr_param) (const union sctp_addr *, 599 union sctp_addr_param *); 600 int (*addr_valid) (union sctp_addr *, 601 struct sctp_sock *, 602 const struct sk_buff *); 603 sctp_scope_t (*scope) (union sctp_addr *); 604 void (*inaddr_any) (union sctp_addr *, __be16); 605 int (*is_any) (const union sctp_addr *); 606 int (*available) (union sctp_addr *, 607 struct sctp_sock *); 608 int (*skb_iif) (const struct sk_buff *sk); 609 int (*is_ce) (const struct sk_buff *sk); 610 void (*seq_dump_addr)(struct seq_file *seq, 611 union sctp_addr *addr); 612 void (*ecn_capable)(struct sock *sk); 613 __u16 net_header_len; 614 int sockaddr_len; 615 sa_family_t sa_family; 616 struct list_head list; 617 }; 618 619 struct sctp_af *sctp_get_af_specific(sa_family_t); 620 int sctp_register_af(struct sctp_af *); 621 622 /* Protocol family functions. */ 623 struct sctp_pf { 624 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 625 void (*skb_msgname) (struct sk_buff *, char *, int *); 626 int (*af_supported) (sa_family_t, struct sctp_sock *); 627 int (*cmp_addr) (const union sctp_addr *, 628 const union sctp_addr *, 629 struct sctp_sock *); 630 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 631 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 632 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 633 struct sock *(*create_accept_sk) (struct sock *sk, 634 struct sctp_association *asoc); 635 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 636 struct sctp_af *af; 637 }; 638 639 640 /* Structure to track chunk fragments that have been acked, but peer 641 * fragments of the same message have not. 642 */ 643 struct sctp_datamsg { 644 /* Chunks waiting to be submitted to lower layer. */ 645 struct list_head chunks; 646 /* Chunks that have been transmitted. */ 647 size_t msg_size; 648 /* Reference counting. */ 649 atomic_t refcnt; 650 /* When is this message no longer interesting to the peer? */ 651 unsigned long expires_at; 652 /* Did the messenge fail to send? */ 653 int send_error; 654 char send_failed; 655 /* Control whether chunks from this message can be abandoned. */ 656 char can_abandon; 657 }; 658 659 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 660 struct sctp_sndrcvinfo *, 661 struct msghdr *, int len); 662 void sctp_datamsg_free(struct sctp_datamsg *); 663 void sctp_datamsg_put(struct sctp_datamsg *); 664 void sctp_chunk_fail(struct sctp_chunk *, int error); 665 int sctp_chunk_abandoned(struct sctp_chunk *); 666 667 /* RFC2960 1.4 Key Terms 668 * 669 * o Chunk: A unit of information within an SCTP packet, consisting of 670 * a chunk header and chunk-specific content. 671 * 672 * As a matter of convenience, we remember the SCTP common header for 673 * each chunk as well as a few other header pointers... 674 */ 675 struct sctp_chunk { 676 struct list_head list; 677 678 atomic_t refcnt; 679 680 /* This is our link to the per-transport transmitted list. */ 681 struct list_head transmitted_list; 682 683 /* This field is used by chunks that hold fragmented data. 684 * For the first fragment this is the list that holds the rest of 685 * fragments. For the remaining fragments, this is the link to the 686 * frag_list maintained in the first fragment. 687 */ 688 struct list_head frag_list; 689 690 /* This points to the sk_buff containing the actual data. */ 691 struct sk_buff *skb; 692 693 /* These are the SCTP headers by reverse order in a packet. 694 * Note that some of these may happen more than once. In that 695 * case, we point at the "current" one, whatever that means 696 * for that level of header. 697 */ 698 699 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 700 union sctp_params param_hdr; 701 union { 702 __u8 *v; 703 struct sctp_datahdr *data_hdr; 704 struct sctp_inithdr *init_hdr; 705 struct sctp_sackhdr *sack_hdr; 706 struct sctp_heartbeathdr *hb_hdr; 707 struct sctp_sender_hb_info *hbs_hdr; 708 struct sctp_shutdownhdr *shutdown_hdr; 709 struct sctp_signed_cookie *cookie_hdr; 710 struct sctp_ecnehdr *ecne_hdr; 711 struct sctp_cwrhdr *ecn_cwr_hdr; 712 struct sctp_errhdr *err_hdr; 713 struct sctp_addiphdr *addip_hdr; 714 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 715 struct sctp_authhdr *auth_hdr; 716 } subh; 717 718 __u8 *chunk_end; 719 720 struct sctp_chunkhdr *chunk_hdr; 721 struct sctphdr *sctp_hdr; 722 723 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 724 struct sctp_sndrcvinfo sinfo; 725 726 /* Which association does this belong to? */ 727 struct sctp_association *asoc; 728 729 /* What endpoint received this chunk? */ 730 struct sctp_ep_common *rcvr; 731 732 /* We fill this in if we are calculating RTT. */ 733 unsigned long sent_at; 734 735 /* What is the origin IP address for this chunk? */ 736 union sctp_addr source; 737 /* Destination address for this chunk. */ 738 union sctp_addr dest; 739 740 /* For outbound message, track all fragments for SEND_FAILED. */ 741 struct sctp_datamsg *msg; 742 743 /* For an inbound chunk, this tells us where it came from. 744 * For an outbound chunk, it tells us where we'd like it to 745 * go. It is NULL if we have no preference. 746 */ 747 struct sctp_transport *transport; 748 749 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 750 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 751 * spec violates the principle premis that all chunks are processed 752 * in order. 753 */ 754 struct sk_buff *auth_chunk; 755 756 #define SCTP_CAN_FRTX 0x0 757 #define SCTP_NEED_FRTX 0x1 758 #define SCTP_DONT_FRTX 0x2 759 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 760 resent:1, /* Has this chunk ever been resent. */ 761 has_tsn:1, /* Does this chunk have a TSN yet? */ 762 has_ssn:1, /* Does this chunk have a SSN yet? */ 763 singleton:1, /* Only chunk in the packet? */ 764 end_of_packet:1, /* Last chunk in the packet? */ 765 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 766 pdiscard:1, /* Discard the whole packet now? */ 767 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 768 data_accepted:1, /* At least 1 chunk accepted */ 769 auth:1, /* IN: was auth'ed | OUT: needs auth */ 770 has_asconf:1, /* IN: have seen an asconf before */ 771 tsn_missing_report:2, /* Data chunk missing counter. */ 772 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 773 }; 774 775 void sctp_chunk_hold(struct sctp_chunk *); 776 void sctp_chunk_put(struct sctp_chunk *); 777 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 778 struct iovec *data); 779 void sctp_chunk_free(struct sctp_chunk *); 780 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 781 void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, const void *data); 782 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 783 const struct sctp_association *, 784 struct sock *); 785 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 786 union sctp_addr *); 787 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 788 789 enum { 790 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 791 SCTP_ADDR_SRC, /* address can be used as source */ 792 SCTP_ADDR_DEL, /* address about to be deleted */ 793 }; 794 795 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 796 struct sctp_sockaddr_entry { 797 struct list_head list; 798 struct rcu_head rcu; 799 union sctp_addr a; 800 __u8 state; 801 __u8 valid; 802 }; 803 804 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 805 806 /* This structure holds lists of chunks as we are assembling for 807 * transmission. 808 */ 809 struct sctp_packet { 810 /* These are the SCTP header values (host order) for the packet. */ 811 __u16 source_port; 812 __u16 destination_port; 813 __u32 vtag; 814 815 /* This contains the payload chunks. */ 816 struct list_head chunk_list; 817 818 /* This is the overhead of the sctp and ip headers. */ 819 size_t overhead; 820 /* This is the total size of all chunks INCLUDING padding. */ 821 size_t size; 822 823 /* The packet is destined for this transport address. 824 * The function we finally use to pass down to the next lower 825 * layer lives in the transport structure. 826 */ 827 struct sctp_transport *transport; 828 829 /* pointer to the auth chunk for this packet */ 830 struct sctp_chunk *auth; 831 832 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 833 has_sack:1, /* This packet contains a SACK chunk. */ 834 has_auth:1, /* This packet contains an AUTH chunk */ 835 has_data:1, /* This packet contains at least 1 DATA chunk */ 836 ipfragok:1, /* So let ip fragment this packet */ 837 malloced:1; /* Is it malloced? */ 838 }; 839 840 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 841 struct sctp_transport *, 842 __u16 sport, __u16 dport); 843 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 844 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 845 struct sctp_chunk *, int); 846 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 847 struct sctp_chunk *); 848 int sctp_packet_transmit(struct sctp_packet *); 849 void sctp_packet_free(struct sctp_packet *); 850 851 static inline int sctp_packet_empty(struct sctp_packet *packet) 852 { 853 return (packet->size == packet->overhead); 854 } 855 856 /* This represents a remote transport address. 857 * For local transport addresses, we just use union sctp_addr. 858 * 859 * RFC2960 Section 1.4 Key Terms 860 * 861 * o Transport address: A Transport Address is traditionally defined 862 * by Network Layer address, Transport Layer protocol and Transport 863 * Layer port number. In the case of SCTP running over IP, a 864 * transport address is defined by the combination of an IP address 865 * and an SCTP port number (where SCTP is the Transport protocol). 866 * 867 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 868 * 869 * o The sender keeps a separate congestion control parameter set for 870 * each of the destination addresses it can send to (not each 871 * source-destination pair but for each destination). The parameters 872 * should decay if the address is not used for a long enough time 873 * period. 874 * 875 */ 876 struct sctp_transport { 877 /* A list of transports. */ 878 struct list_head transports; 879 880 /* Reference counting. */ 881 atomic_t refcnt; 882 int dead; 883 884 /* This is the peer's IP address and port. */ 885 union sctp_addr ipaddr; 886 887 /* These are the functions we call to handle LLP stuff. */ 888 struct sctp_af *af_specific; 889 890 /* Which association do we belong to? */ 891 struct sctp_association *asoc; 892 893 /* RFC2960 894 * 895 * 12.3 Per Transport Address Data 896 * 897 * For each destination transport address in the peer's 898 * address list derived from the INIT or INIT ACK chunk, a 899 * number of data elements needs to be maintained including: 900 */ 901 /* RTO : The current retransmission timeout value. */ 902 unsigned long rto; 903 904 __u32 rtt; /* This is the most recent RTT. */ 905 906 /* RTTVAR : The current RTT variation. */ 907 __u32 rttvar; 908 909 /* SRTT : The current smoothed round trip time. */ 910 __u32 srtt; 911 912 /* RTO-Pending : A flag used to track if one of the DATA 913 * chunks sent to this address is currently being 914 * used to compute a RTT. If this flag is 0, 915 * the next DATA chunk sent to this destination 916 * should be used to compute a RTT and this flag 917 * should be set. Every time the RTT 918 * calculation completes (i.e. the DATA chunk 919 * is SACK'd) clear this flag. 920 * hb_sent : a flag that signals that we have a pending heartbeat. 921 */ 922 __u8 rto_pending; 923 __u8 hb_sent; 924 925 /* Flag to track the current fast recovery state */ 926 __u8 fast_recovery; 927 928 /* 929 * These are the congestion stats. 930 */ 931 /* cwnd : The current congestion window. */ 932 __u32 cwnd; /* This is the actual cwnd. */ 933 934 /* ssthresh : The current slow start threshold value. */ 935 __u32 ssthresh; 936 937 /* partial : The tracking method for increase of cwnd when in 938 * bytes acked : congestion avoidance mode (see Section 6.2.2) 939 */ 940 __u32 partial_bytes_acked; 941 942 /* Data that has been sent, but not acknowledged. */ 943 __u32 flight_size; 944 945 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 946 947 /* TSN marking the fast recovery exit point */ 948 __u32 fast_recovery_exit; 949 950 /* Destination */ 951 struct dst_entry *dst; 952 /* Source address. */ 953 union sctp_addr saddr; 954 955 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 956 * the destination address every heartbeat interval. 957 */ 958 unsigned long hbinterval; 959 960 /* SACK delay timeout */ 961 unsigned long sackdelay; 962 __u32 sackfreq; 963 964 /* When was the last time (in jiffies) that we heard from this 965 * transport? We use this to pick new active and retran paths. 966 */ 967 unsigned long last_time_heard; 968 969 /* Last time(in jiffies) when cwnd is reduced due to the congestion 970 * indication based on ECNE chunk. 971 */ 972 unsigned long last_time_ecne_reduced; 973 974 /* This is the max_retrans value for the transport and will 975 * be initialized from the assocs value. This can be changed 976 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 977 */ 978 __u16 pathmaxrxt; 979 980 /* is the Path MTU update pending on this tranport */ 981 __u8 pmtu_pending; 982 983 /* PMTU : The current known path MTU. */ 984 __u32 pathmtu; 985 986 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 987 __u32 param_flags; 988 989 /* The number of times INIT has been sent on this transport. */ 990 int init_sent_count; 991 992 /* state : The current state of this destination, 993 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 994 */ 995 int state; 996 997 /* These are the error stats for this destination. */ 998 999 /* Error count : The current error count for this destination. */ 1000 unsigned short error_count; 1001 1002 /* Per : A timer used by each destination. 1003 * Destination : 1004 * Timer : 1005 * 1006 * [Everywhere else in the text this is called T3-rtx. -ed] 1007 */ 1008 struct timer_list T3_rtx_timer; 1009 1010 /* Heartbeat timer is per destination. */ 1011 struct timer_list hb_timer; 1012 1013 /* Timer to handle ICMP proto unreachable envets */ 1014 struct timer_list proto_unreach_timer; 1015 1016 /* Since we're using per-destination retransmission timers 1017 * (see above), we're also using per-destination "transmitted" 1018 * queues. This probably ought to be a private struct 1019 * accessible only within the outqueue, but it's not, yet. 1020 */ 1021 struct list_head transmitted; 1022 1023 /* We build bundle-able packets for this transport here. */ 1024 struct sctp_packet packet; 1025 1026 /* This is the list of transports that have chunks to send. */ 1027 struct list_head send_ready; 1028 1029 int malloced; /* Is this structure kfree()able? */ 1030 1031 /* State information saved for SFR_CACC algorithm. The key 1032 * idea in SFR_CACC is to maintain state at the sender on a 1033 * per-destination basis when a changeover happens. 1034 * char changeover_active; 1035 * char cycling_changeover; 1036 * __u32 next_tsn_at_change; 1037 * char cacc_saw_newack; 1038 */ 1039 struct { 1040 /* An unsigned integer, which stores the next TSN to be 1041 * used by the sender, at the moment of changeover. 1042 */ 1043 __u32 next_tsn_at_change; 1044 1045 /* A flag which indicates the occurrence of a changeover */ 1046 char changeover_active; 1047 1048 /* A flag which indicates whether the change of primary is 1049 * the first switch to this destination address during an 1050 * active switch. 1051 */ 1052 char cycling_changeover; 1053 1054 /* A temporary flag, which is used during the processing of 1055 * a SACK to estimate the causative TSN(s)'s group. 1056 */ 1057 char cacc_saw_newack; 1058 } cacc; 1059 1060 /* 64-bit random number sent with heartbeat. */ 1061 __u64 hb_nonce; 1062 }; 1063 1064 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1065 gfp_t); 1066 void sctp_transport_set_owner(struct sctp_transport *, 1067 struct sctp_association *); 1068 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1069 struct sctp_sock *); 1070 void sctp_transport_pmtu(struct sctp_transport *); 1071 void sctp_transport_free(struct sctp_transport *); 1072 void sctp_transport_reset_timers(struct sctp_transport *, int); 1073 void sctp_transport_hold(struct sctp_transport *); 1074 void sctp_transport_put(struct sctp_transport *); 1075 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1076 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1077 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1078 void sctp_transport_burst_limited(struct sctp_transport *); 1079 void sctp_transport_burst_reset(struct sctp_transport *); 1080 unsigned long sctp_transport_timeout(struct sctp_transport *); 1081 void sctp_transport_reset(struct sctp_transport *); 1082 void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1083 1084 1085 /* This is the structure we use to queue packets as they come into 1086 * SCTP. We write packets to it and read chunks from it. 1087 */ 1088 struct sctp_inq { 1089 /* This is actually a queue of sctp_chunk each 1090 * containing a partially decoded packet. 1091 */ 1092 struct list_head in_chunk_list; 1093 /* This is the packet which is currently off the in queue and is 1094 * being worked on through the inbound chunk processing. 1095 */ 1096 struct sctp_chunk *in_progress; 1097 1098 /* This is the delayed task to finish delivering inbound 1099 * messages. 1100 */ 1101 struct work_struct immediate; 1102 1103 int malloced; /* Is this structure kfree()able? */ 1104 }; 1105 1106 void sctp_inq_init(struct sctp_inq *); 1107 void sctp_inq_free(struct sctp_inq *); 1108 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1109 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1110 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1111 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1112 1113 /* This is the structure we use to hold outbound chunks. You push 1114 * chunks in and they automatically pop out the other end as bundled 1115 * packets (it calls (*output_handler)()). 1116 * 1117 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1118 * and 8.2 of the v13 draft. 1119 * 1120 * It handles retransmissions. The connection to the timeout portion 1121 * of the state machine is through sctp_..._timeout() and timeout_handler. 1122 * 1123 * If you feed it SACKs, it will eat them. 1124 * 1125 * If you give it big chunks, it will fragment them. 1126 * 1127 * It assigns TSN's to data chunks. This happens at the last possible 1128 * instant before transmission. 1129 * 1130 * When free()'d, it empties itself out via output_handler(). 1131 */ 1132 struct sctp_outq { 1133 struct sctp_association *asoc; 1134 1135 /* Data pending that has never been transmitted. */ 1136 struct list_head out_chunk_list; 1137 1138 unsigned out_qlen; /* Total length of queued data chunks. */ 1139 1140 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1141 unsigned error; 1142 1143 /* These are control chunks we want to send. */ 1144 struct list_head control_chunk_list; 1145 1146 /* These are chunks that have been sacked but are above the 1147 * CTSN, or cumulative tsn ack point. 1148 */ 1149 struct list_head sacked; 1150 1151 /* Put chunks on this list to schedule them for 1152 * retransmission. 1153 */ 1154 struct list_head retransmit; 1155 1156 /* Put chunks on this list to save them for FWD TSN processing as 1157 * they were abandoned. 1158 */ 1159 struct list_head abandoned; 1160 1161 /* How many unackd bytes do we have in-flight? */ 1162 __u32 outstanding_bytes; 1163 1164 /* Are we doing fast-rtx on this queue */ 1165 char fast_rtx; 1166 1167 /* Corked? */ 1168 char cork; 1169 1170 /* Is this structure empty? */ 1171 char empty; 1172 1173 /* Are we kfree()able? */ 1174 char malloced; 1175 }; 1176 1177 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1178 void sctp_outq_teardown(struct sctp_outq *); 1179 void sctp_outq_free(struct sctp_outq*); 1180 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1181 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1182 int sctp_outq_is_empty(const struct sctp_outq *); 1183 void sctp_outq_restart(struct sctp_outq *); 1184 1185 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1186 sctp_retransmit_reason_t); 1187 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1188 int sctp_outq_uncork(struct sctp_outq *); 1189 /* Uncork and flush an outqueue. */ 1190 static inline void sctp_outq_cork(struct sctp_outq *q) 1191 { 1192 q->cork = 1; 1193 } 1194 1195 /* These bind address data fields common between endpoints and associations */ 1196 struct sctp_bind_addr { 1197 1198 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1199 * 1200 * SCTP Port: The local SCTP port number the endpoint is 1201 * bound to. 1202 */ 1203 __u16 port; 1204 1205 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1206 * 1207 * Address List: The list of IP addresses that this instance 1208 * has bound. This information is passed to one's 1209 * peer(s) in INIT and INIT ACK chunks. 1210 */ 1211 struct list_head address_list; 1212 1213 int malloced; /* Are we kfree()able? */ 1214 }; 1215 1216 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1217 void sctp_bind_addr_free(struct sctp_bind_addr *); 1218 int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1219 const struct sctp_bind_addr *src, 1220 sctp_scope_t scope, gfp_t gfp, 1221 int flags); 1222 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1223 const struct sctp_bind_addr *src, 1224 gfp_t gfp); 1225 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1226 __u8 addr_state, gfp_t gfp); 1227 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1228 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1229 struct sctp_sock *); 1230 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1231 struct sctp_sock *, struct sctp_sock *); 1232 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1233 const union sctp_addr *addr); 1234 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1235 const union sctp_addr *addrs, 1236 int addrcnt, 1237 struct sctp_sock *opt); 1238 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1239 int *addrs_len, 1240 gfp_t gfp); 1241 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1242 __u16 port, gfp_t gfp); 1243 1244 sctp_scope_t sctp_scope(const union sctp_addr *); 1245 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1246 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1247 int sctp_addr_is_valid(const union sctp_addr *addr); 1248 1249 1250 /* What type of endpoint? */ 1251 typedef enum { 1252 SCTP_EP_TYPE_SOCKET, 1253 SCTP_EP_TYPE_ASSOCIATION, 1254 } sctp_endpoint_type_t; 1255 1256 /* 1257 * A common base class to bridge the implmentation view of a 1258 * socket (usually listening) endpoint versus an association's 1259 * local endpoint. 1260 * This common structure is useful for several purposes: 1261 * 1) Common interface for lookup routines. 1262 * a) Subfunctions work for either endpoint or association 1263 * b) Single interface to lookup allows hiding the lookup lock rather 1264 * than acquiring it externally. 1265 * 2) Common interface for the inbound chunk handling/state machine. 1266 * 3) Common object handling routines for reference counting, etc. 1267 * 4) Disentangle association lookup from endpoint lookup, where we 1268 * do not have to find our endpoint to find our association. 1269 * 1270 */ 1271 1272 struct sctp_ep_common { 1273 /* Fields to help us manage our entries in the hash tables. */ 1274 struct hlist_node node; 1275 int hashent; 1276 1277 /* Runtime type information. What kind of endpoint is this? */ 1278 sctp_endpoint_type_t type; 1279 1280 /* Some fields to help us manage this object. 1281 * refcnt - Reference count access to this object. 1282 * dead - Do not attempt to use this object. 1283 * malloced - Do we need to kfree this object? 1284 */ 1285 atomic_t refcnt; 1286 char dead; 1287 char malloced; 1288 1289 /* What socket does this endpoint belong to? */ 1290 struct sock *sk; 1291 1292 /* This is where we receive inbound chunks. */ 1293 struct sctp_inq inqueue; 1294 1295 /* This substructure includes the defining parameters of the 1296 * endpoint: 1297 * bind_addr.port is our shared port number. 1298 * bind_addr.address_list is our set of local IP addresses. 1299 */ 1300 struct sctp_bind_addr bind_addr; 1301 }; 1302 1303 1304 /* RFC Section 1.4 Key Terms 1305 * 1306 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1307 * multi-homed host, an SCTP endpoint is represented to its peers as a 1308 * combination of a set of eligible destination transport addresses to 1309 * which SCTP packets can be sent and a set of eligible source 1310 * transport addresses from which SCTP packets can be received. 1311 * All transport addresses used by an SCTP endpoint must use the 1312 * same port number, but can use multiple IP addresses. A transport 1313 * address used by an SCTP endpoint must not be used by another 1314 * SCTP endpoint. In other words, a transport address is unique 1315 * to an SCTP endpoint. 1316 * 1317 * From an implementation perspective, each socket has one of these. 1318 * A TCP-style socket will have exactly one association on one of 1319 * these. An UDP-style socket will have multiple associations hanging 1320 * off one of these. 1321 */ 1322 1323 struct sctp_endpoint { 1324 /* Common substructure for endpoint and association. */ 1325 struct sctp_ep_common base; 1326 1327 /* Associations: A list of current associations and mappings 1328 * to the data consumers for each association. This 1329 * may be in the form of a hash table or other 1330 * implementation dependent structure. The data 1331 * consumers may be process identification 1332 * information such as file descriptors, named pipe 1333 * pointer, or table pointers dependent on how SCTP 1334 * is implemented. 1335 */ 1336 /* This is really a list of struct sctp_association entries. */ 1337 struct list_head asocs; 1338 1339 /* Secret Key: A secret key used by this endpoint to compute 1340 * the MAC. This SHOULD be a cryptographic quality 1341 * random number with a sufficient length. 1342 * Discussion in [RFC1750] can be helpful in 1343 * selection of the key. 1344 */ 1345 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1346 int current_key; 1347 int last_key; 1348 int key_changed_at; 1349 1350 /* digest: This is a digest of the sctp cookie. This field is 1351 * only used on the receive path when we try to validate 1352 * that the cookie has not been tampered with. We put 1353 * this here so we pre-allocate this once and can re-use 1354 * on every receive. 1355 */ 1356 __u8 *digest; 1357 1358 /* sendbuf acct. policy. */ 1359 __u32 sndbuf_policy; 1360 1361 /* rcvbuf acct. policy. */ 1362 __u32 rcvbuf_policy; 1363 1364 /* SCTP AUTH: array of the HMACs that will be allocated 1365 * we need this per association so that we don't serialize 1366 */ 1367 struct crypto_hash **auth_hmacs; 1368 1369 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1370 struct sctp_hmac_algo_param *auth_hmacs_list; 1371 1372 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1373 struct sctp_chunks_param *auth_chunk_list; 1374 1375 /* SCTP-AUTH: endpoint shared keys */ 1376 struct list_head endpoint_shared_keys; 1377 __u16 active_key_id; 1378 }; 1379 1380 /* Recover the outter endpoint structure. */ 1381 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1382 { 1383 struct sctp_endpoint *ep; 1384 1385 ep = container_of(base, struct sctp_endpoint, base); 1386 return ep; 1387 } 1388 1389 /* These are function signatures for manipulating endpoints. */ 1390 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1391 void sctp_endpoint_free(struct sctp_endpoint *); 1392 void sctp_endpoint_put(struct sctp_endpoint *); 1393 void sctp_endpoint_hold(struct sctp_endpoint *); 1394 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1395 struct sctp_association *sctp_endpoint_lookup_assoc( 1396 const struct sctp_endpoint *ep, 1397 const union sctp_addr *paddr, 1398 struct sctp_transport **); 1399 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1400 const union sctp_addr *); 1401 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1402 const union sctp_addr *); 1403 int sctp_has_association(const union sctp_addr *laddr, 1404 const union sctp_addr *paddr); 1405 1406 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1407 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1408 struct sctp_chunk **err_chunk); 1409 int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1410 const union sctp_addr *peer, 1411 sctp_init_chunk_t *init, gfp_t gfp); 1412 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1413 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1414 1415 struct sctp_inithdr_host { 1416 __u32 init_tag; 1417 __u32 a_rwnd; 1418 __u16 num_outbound_streams; 1419 __u16 num_inbound_streams; 1420 __u32 initial_tsn; 1421 }; 1422 1423 /* RFC2960 1424 * 1425 * 12. Recommended Transmission Control Block (TCB) Parameters 1426 * 1427 * This section details a recommended set of parameters that should 1428 * be contained within the TCB for an implementation. This section is 1429 * for illustrative purposes and should not be deemed as requirements 1430 * on an implementation or as an exhaustive list of all parameters 1431 * inside an SCTP TCB. Each implementation may need its own additional 1432 * parameters for optimization. 1433 */ 1434 1435 1436 /* Here we have information about each individual association. */ 1437 struct sctp_association { 1438 1439 /* A base structure common to endpoint and association. 1440 * In this context, it represents the associations's view 1441 * of the local endpoint of the association. 1442 */ 1443 struct sctp_ep_common base; 1444 1445 /* Associations on the same socket. */ 1446 struct list_head asocs; 1447 1448 /* association id. */ 1449 sctp_assoc_t assoc_id; 1450 1451 /* This is our parent endpoint. */ 1452 struct sctp_endpoint *ep; 1453 1454 /* These are those association elements needed in the cookie. */ 1455 struct sctp_cookie c; 1456 1457 /* This is all information about our peer. */ 1458 struct { 1459 /* rwnd 1460 * 1461 * Peer Rwnd : Current calculated value of the peer's rwnd. 1462 */ 1463 __u32 rwnd; 1464 1465 /* transport_addr_list 1466 * 1467 * Peer : A list of SCTP transport addresses that the 1468 * Transport : peer is bound to. This information is derived 1469 * Address : from the INIT or INIT ACK and is used to 1470 * List : associate an inbound packet with a given 1471 * : association. Normally this information is 1472 * : hashed or keyed for quick lookup and access 1473 * : of the TCB. 1474 * : The list is also initialized with the list 1475 * : of addresses passed with the sctp_connectx() 1476 * : call. 1477 * 1478 * It is a list of SCTP_transport's. 1479 */ 1480 struct list_head transport_addr_list; 1481 1482 /* transport_count 1483 * 1484 * Peer : A count of the number of peer addresses 1485 * Transport : in the Peer Transport Address List. 1486 * Address : 1487 * Count : 1488 */ 1489 __u16 transport_count; 1490 1491 /* port 1492 * The transport layer port number. 1493 */ 1494 __u16 port; 1495 1496 /* primary_path 1497 * 1498 * Primary : This is the current primary destination 1499 * Path : transport address of the peer endpoint. It 1500 * : may also specify a source transport address 1501 * : on this endpoint. 1502 * 1503 * All of these paths live on transport_addr_list. 1504 * 1505 * At the bakeoffs, we discovered that the intent of 1506 * primaryPath is that it only changes when the ULP 1507 * asks to have it changed. We add the activePath to 1508 * designate the connection we are currently using to 1509 * transmit new data and most control chunks. 1510 */ 1511 struct sctp_transport *primary_path; 1512 1513 /* Cache the primary path address here, when we 1514 * need a an address for msg_name. 1515 */ 1516 union sctp_addr primary_addr; 1517 1518 /* active_path 1519 * The path that we are currently using to 1520 * transmit new data and most control chunks. 1521 */ 1522 struct sctp_transport *active_path; 1523 1524 /* retran_path 1525 * 1526 * RFC2960 6.4 Multi-homed SCTP Endpoints 1527 * ... 1528 * Furthermore, when its peer is multi-homed, an 1529 * endpoint SHOULD try to retransmit a chunk to an 1530 * active destination transport address that is 1531 * different from the last destination address to 1532 * which the DATA chunk was sent. 1533 */ 1534 struct sctp_transport *retran_path; 1535 1536 /* Pointer to last transport I have sent on. */ 1537 struct sctp_transport *last_sent_to; 1538 1539 /* This is the last transport I have received DATA on. */ 1540 struct sctp_transport *last_data_from; 1541 1542 /* 1543 * Mapping An array of bits or bytes indicating which out of 1544 * Array order TSN's have been received (relative to the 1545 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1546 * order packets have been received, this array 1547 * will be set to all zero. This structure may be 1548 * in the form of a circular buffer or bit array. 1549 * 1550 * Last Rcvd : This is the last TSN received in 1551 * TSN : sequence. This value is set initially by 1552 * : taking the peer's Initial TSN, received in 1553 * : the INIT or INIT ACK chunk, and subtracting 1554 * : one from it. 1555 * 1556 * Throughout most of the specification this is called the 1557 * "Cumulative TSN ACK Point". In this case, we 1558 * ignore the advice in 12.2 in favour of the term 1559 * used in the bulk of the text. This value is hidden 1560 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1561 */ 1562 struct sctp_tsnmap tsn_map; 1563 1564 /* Ack State : This flag indicates if the next received 1565 * : packet is to be responded to with a 1566 * : SACK. This is initializedto 0. When a packet 1567 * : is received it is incremented. If this value 1568 * : reaches 2 or more, a SACK is sent and the 1569 * : value is reset to 0. Note: This is used only 1570 * : when no DATA chunks are received out of 1571 * : order. When DATA chunks are out of order, 1572 * : SACK's are not delayed (see Section 6). 1573 */ 1574 __u8 sack_needed; /* Do we need to sack the peer? */ 1575 __u32 sack_cnt; 1576 1577 /* These are capabilities which our peer advertised. */ 1578 __u8 ecn_capable:1, /* Can peer do ECN? */ 1579 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1580 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1581 hostname_address:1, /* Peer understands DNS addresses? */ 1582 asconf_capable:1, /* Does peer support ADDIP? */ 1583 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1584 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1585 1586 __u32 adaptation_ind; /* Adaptation Code point. */ 1587 1588 /* This mask is used to disable sending the ASCONF chunk 1589 * with specified parameter to peer. 1590 */ 1591 __be16 addip_disabled_mask; 1592 1593 struct sctp_inithdr_host i; 1594 int cookie_len; 1595 void *cookie; 1596 1597 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1598 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1599 * Initial TSN Value minus 1 1600 */ 1601 __u32 addip_serial; 1602 1603 /* SCTP-AUTH: We need to know pears random number, hmac list 1604 * and authenticated chunk list. All that is part of the 1605 * cookie and these are just pointers to those locations 1606 */ 1607 sctp_random_param_t *peer_random; 1608 sctp_chunks_param_t *peer_chunks; 1609 sctp_hmac_algo_param_t *peer_hmacs; 1610 } peer; 1611 1612 /* State : A state variable indicating what state the 1613 * : association is in, i.e. COOKIE-WAIT, 1614 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1615 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1616 * 1617 * Note: No "CLOSED" state is illustrated since if a 1618 * association is "CLOSED" its TCB SHOULD be removed. 1619 * 1620 * In this implementation we DO have a CLOSED 1621 * state which is used during initiation and shutdown. 1622 * 1623 * State takes values from SCTP_STATE_*. 1624 */ 1625 sctp_state_t state; 1626 1627 /* The cookie life I award for any cookie. */ 1628 struct timeval cookie_life; 1629 1630 /* Overall : The overall association error count. 1631 * Error Count : [Clear this any time I get something.] 1632 */ 1633 int overall_error_count; 1634 1635 /* These are the association's initial, max, and min RTO values. 1636 * These values will be initialized by system defaults, but can 1637 * be modified via the SCTP_RTOINFO socket option. 1638 */ 1639 unsigned long rto_initial; 1640 unsigned long rto_max; 1641 unsigned long rto_min; 1642 1643 /* Maximum number of new data packets that can be sent in a burst. */ 1644 int max_burst; 1645 1646 /* This is the max_retrans value for the association. This value will 1647 * be initialized initialized from system defaults, but can be 1648 * modified by the SCTP_ASSOCINFO socket option. 1649 */ 1650 int max_retrans; 1651 1652 /* Maximum number of times the endpoint will retransmit INIT */ 1653 __u16 max_init_attempts; 1654 1655 /* How many times have we resent an INIT? */ 1656 __u16 init_retries; 1657 1658 /* The largest timeout or RTO value to use in attempting an INIT */ 1659 unsigned long max_init_timeo; 1660 1661 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1662 * the destination address every heartbeat interval. This value 1663 * will be inherited by all new transports. 1664 */ 1665 unsigned long hbinterval; 1666 1667 /* This is the max_retrans value for new transports in the 1668 * association. 1669 */ 1670 __u16 pathmaxrxt; 1671 1672 /* Flag that path mtu update is pending */ 1673 __u8 pmtu_pending; 1674 1675 /* Association : The smallest PMTU discovered for all of the 1676 * PMTU : peer's transport addresses. 1677 */ 1678 __u32 pathmtu; 1679 1680 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1681 __u32 param_flags; 1682 1683 /* SACK delay timeout */ 1684 unsigned long sackdelay; 1685 __u32 sackfreq; 1686 1687 1688 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1689 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1690 1691 /* Transport to which SHUTDOWN chunk was last sent. */ 1692 struct sctp_transport *shutdown_last_sent_to; 1693 1694 /* How many times have we resent a SHUTDOWN */ 1695 int shutdown_retries; 1696 1697 /* Transport to which INIT chunk was last sent. */ 1698 struct sctp_transport *init_last_sent_to; 1699 1700 /* Next TSN : The next TSN number to be assigned to a new 1701 * : DATA chunk. This is sent in the INIT or INIT 1702 * : ACK chunk to the peer and incremented each 1703 * : time a DATA chunk is assigned a TSN 1704 * : (normally just prior to transmit or during 1705 * : fragmentation). 1706 */ 1707 __u32 next_tsn; 1708 1709 /* 1710 * Last Rcvd : This is the last TSN received in sequence. This value 1711 * TSN : is set initially by taking the peer's Initial TSN, 1712 * : received in the INIT or INIT ACK chunk, and 1713 * : subtracting one from it. 1714 * 1715 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1716 */ 1717 1718 __u32 ctsn_ack_point; 1719 1720 /* PR-SCTP Advanced.Peer.Ack.Point */ 1721 __u32 adv_peer_ack_point; 1722 1723 /* Highest TSN that is acknowledged by incoming SACKs. */ 1724 __u32 highest_sacked; 1725 1726 /* The number of unacknowledged data chunks. Reported through 1727 * the SCTP_STATUS sockopt. 1728 */ 1729 __u16 unack_data; 1730 1731 /* The total number of data chunks that we've had to retransmit 1732 * as the result of a T3 timer expiration 1733 */ 1734 __u32 rtx_data_chunks; 1735 1736 /* This is the association's receive buffer space. This value is used 1737 * to set a_rwnd field in an INIT or a SACK chunk. 1738 */ 1739 __u32 rwnd; 1740 1741 /* This is the last advertised value of rwnd over a SACK chunk. */ 1742 __u32 a_rwnd; 1743 1744 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1745 * to slop over a maximum of the association's frag_point. 1746 */ 1747 __u32 rwnd_over; 1748 1749 /* Keeps treack of rwnd pressure. This happens when we have 1750 * a window, but not recevie buffer (i.e small packets). This one 1751 * is releases slowly (1 PMTU at a time ). 1752 */ 1753 __u32 rwnd_press; 1754 1755 /* This is the sndbuf size in use for the association. 1756 * This corresponds to the sndbuf size for the association, 1757 * as specified in the sk->sndbuf. 1758 */ 1759 int sndbuf_used; 1760 1761 /* This is the amount of memory that this association has allocated 1762 * in the receive path at any given time. 1763 */ 1764 atomic_t rmem_alloc; 1765 1766 /* This is the wait queue head for send requests waiting on 1767 * the association sndbuf space. 1768 */ 1769 wait_queue_head_t wait; 1770 1771 /* The message size at which SCTP fragmentation will occur. */ 1772 __u32 frag_point; 1773 __u32 user_frag; 1774 1775 /* Counter used to count INIT errors. */ 1776 int init_err_counter; 1777 1778 /* Count the number of INIT cycles (for doubling timeout). */ 1779 int init_cycle; 1780 1781 /* Default send parameters. */ 1782 __u16 default_stream; 1783 __u16 default_flags; 1784 __u32 default_ppid; 1785 __u32 default_context; 1786 __u32 default_timetolive; 1787 1788 /* Default receive parameters */ 1789 __u32 default_rcv_context; 1790 1791 /* This tracks outbound ssn for a given stream. */ 1792 struct sctp_ssnmap *ssnmap; 1793 1794 /* All outbound chunks go through this structure. */ 1795 struct sctp_outq outqueue; 1796 1797 /* A smart pipe that will handle reordering and fragmentation, 1798 * as well as handle passing events up to the ULP. 1799 */ 1800 struct sctp_ulpq ulpq; 1801 1802 /* Last TSN that caused an ECNE Chunk to be sent. */ 1803 __u32 last_ecne_tsn; 1804 1805 /* Last TSN that caused a CWR Chunk to be sent. */ 1806 __u32 last_cwr_tsn; 1807 1808 /* How many duplicated TSNs have we seen? */ 1809 int numduptsns; 1810 1811 /* Number of seconds of idle time before an association is closed. 1812 * In the association context, this is really used as a boolean 1813 * since the real timeout is stored in the timeouts array 1814 */ 1815 __u32 autoclose; 1816 1817 /* These are to support 1818 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1819 * and Enforcement of Flow and Message Limits" 1820 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1821 * or "ADDIP" for short. 1822 */ 1823 1824 1825 1826 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1827 * 1828 * R1) One and only one ASCONF Chunk MAY be in transit and 1829 * unacknowledged at any one time. If a sender, after sending 1830 * an ASCONF chunk, decides it needs to transfer another 1831 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1832 * returns from the previous ASCONF Chunk before sending a 1833 * subsequent ASCONF. Note this restriction binds each side, 1834 * so at any time two ASCONF may be in-transit on any given 1835 * association (one sent from each endpoint). 1836 * 1837 * [This is our one-and-only-one ASCONF in flight. If we do 1838 * not have an ASCONF in flight, this is NULL.] 1839 */ 1840 struct sctp_chunk *addip_last_asconf; 1841 1842 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1843 * 1844 * This is needed to implement itmes E1 - E4 of the updated 1845 * spec. Here is the justification: 1846 * 1847 * Since the peer may bundle multiple ASCONF chunks toward us, 1848 * we now need the ability to cache multiple ACKs. The section 1849 * describes in detail how they are cached and cleaned up. 1850 */ 1851 struct list_head asconf_ack_list; 1852 1853 /* These ASCONF chunks are waiting to be sent. 1854 * 1855 * These chunaks can't be pushed to outqueue until receiving 1856 * ASCONF_ACK for the previous ASCONF indicated by 1857 * addip_last_asconf, so as to guarantee that only one ASCONF 1858 * is in flight at any time. 1859 * 1860 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1861 * 1862 * In defining the ASCONF Chunk transfer procedures, it is 1863 * essential that these transfers MUST NOT cause congestion 1864 * within the network. To achieve this, we place these 1865 * restrictions on the transfer of ASCONF Chunks: 1866 * 1867 * R1) One and only one ASCONF Chunk MAY be in transit and 1868 * unacknowledged at any one time. If a sender, after sending 1869 * an ASCONF chunk, decides it needs to transfer another 1870 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1871 * returns from the previous ASCONF Chunk before sending a 1872 * subsequent ASCONF. Note this restriction binds each side, 1873 * so at any time two ASCONF may be in-transit on any given 1874 * association (one sent from each endpoint). 1875 * 1876 * 1877 * [I really think this is EXACTLY the sort of intelligence 1878 * which already resides in sctp_outq. Please move this 1879 * queue and its supporting logic down there. --piggy] 1880 */ 1881 struct list_head addip_chunk_list; 1882 1883 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1884 * 1885 * A2) A serial number should be assigned to the Chunk. The 1886 * serial number SHOULD be a monotonically increasing 1887 * number. The serial number SHOULD be initialized at 1888 * the start of the association to the same value as the 1889 * Initial TSN and every time a new ASCONF chunk is created 1890 * it is incremented by one after assigning the serial number 1891 * to the newly created chunk. 1892 * 1893 * ADDIP 1894 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1895 * 1896 * Serial Number : 32 bits (unsigned integer) 1897 * 1898 * This value represents a Serial Number for the ASCONF 1899 * Chunk. The valid range of Serial Number is from 0 to 1900 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1901 * after reaching 4294967295. 1902 */ 1903 __u32 addip_serial; 1904 1905 /* SCTP AUTH: list of the endpoint shared keys. These 1906 * keys are provided out of band by the user applicaton 1907 * and can't change during the lifetime of the association 1908 */ 1909 struct list_head endpoint_shared_keys; 1910 1911 /* SCTP AUTH: 1912 * The current generated assocaition shared key (secret) 1913 */ 1914 struct sctp_auth_bytes *asoc_shared_key; 1915 1916 /* SCTP AUTH: hmac id of the first peer requested algorithm 1917 * that we support. 1918 */ 1919 __u16 default_hmac_id; 1920 1921 __u16 active_key_id; 1922 1923 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1924 temp:1; /* Is it a temporary association? */ 1925 }; 1926 1927 1928 /* An eyecatcher for determining if we are really looking at an 1929 * association data structure. 1930 */ 1931 enum { 1932 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1933 }; 1934 1935 /* Recover the outter association structure. */ 1936 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1937 { 1938 struct sctp_association *asoc; 1939 1940 asoc = container_of(base, struct sctp_association, base); 1941 return asoc; 1942 } 1943 1944 /* These are function signatures for manipulating associations. */ 1945 1946 1947 struct sctp_association * 1948 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1949 sctp_scope_t scope, gfp_t gfp); 1950 void sctp_association_free(struct sctp_association *); 1951 void sctp_association_put(struct sctp_association *); 1952 void sctp_association_hold(struct sctp_association *); 1953 1954 struct sctp_transport *sctp_assoc_choose_alter_transport( 1955 struct sctp_association *, struct sctp_transport *); 1956 void sctp_assoc_update_retran_path(struct sctp_association *); 1957 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1958 const union sctp_addr *); 1959 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1960 const union sctp_addr *laddr); 1961 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1962 const union sctp_addr *address, 1963 const gfp_t gfp, 1964 const int peer_state); 1965 void sctp_assoc_del_peer(struct sctp_association *asoc, 1966 const union sctp_addr *addr); 1967 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1968 struct sctp_transport *peer); 1969 void sctp_assoc_control_transport(struct sctp_association *, 1970 struct sctp_transport *, 1971 sctp_transport_cmd_t, sctp_sn_error_t); 1972 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1973 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1974 const union sctp_addr *, 1975 const union sctp_addr *); 1976 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1977 void sctp_assoc_update(struct sctp_association *old, 1978 struct sctp_association *new); 1979 1980 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1981 1982 void sctp_assoc_sync_pmtu(struct sctp_association *); 1983 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1984 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1985 void sctp_assoc_set_primary(struct sctp_association *, 1986 struct sctp_transport *); 1987 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1988 struct sctp_transport *); 1989 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1990 sctp_scope_t, gfp_t); 1991 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1992 struct sctp_cookie*, 1993 gfp_t gfp); 1994 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1995 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1996 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1997 const struct sctp_association *asoc, 1998 __be32 serial); 1999 2000 2001 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 2002 const union sctp_addr *ss2); 2003 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2004 2005 /* A convenience structure to parse out SCTP specific CMSGs. */ 2006 typedef struct sctp_cmsgs { 2007 struct sctp_initmsg *init; 2008 struct sctp_sndrcvinfo *info; 2009 } sctp_cmsgs_t; 2010 2011 /* Structure for tracking memory objects */ 2012 typedef struct { 2013 char *label; 2014 atomic_t *counter; 2015 } sctp_dbg_objcnt_entry_t; 2016 2017 #endif /* __sctp_structs_h__ */ 2018