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