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, see 23 * <http://www.gnu.org/licenses/>. 24 * 25 * Please send any bug reports or fixes you make to the 26 * email addresses: 27 * lksctp developers <linux-sctp@vger.kernel.org> 28 * 29 * Written or modified by: 30 * Randall Stewart <randall@sctp.chicago.il.us> 31 * Ken Morneau <kmorneau@cisco.com> 32 * Qiaobing Xie <qxie1@email.mot.com> 33 * La Monte H.P. Yarroll <piggy@acm.org> 34 * Karl Knutson <karl@athena.chicago.il.us> 35 * Jon Grimm <jgrimm@us.ibm.com> 36 * Xingang Guo <xingang.guo@intel.com> 37 * Hui Huang <hui.huang@nokia.com> 38 * Sridhar Samudrala <sri@us.ibm.com> 39 * Daisy Chang <daisyc@us.ibm.com> 40 * Dajiang Zhang <dajiang.zhang@nokia.com> 41 * Ardelle Fan <ardelle.fan@intel.com> 42 * Ryan Layer <rmlayer@us.ibm.com> 43 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 44 * Kevin Gao <kevin.gao@intel.com> 45 */ 46 47 #ifndef __sctp_structs_h__ 48 #define __sctp_structs_h__ 49 50 #include <linux/ktime.h> 51 #include <linux/rhashtable.h> 52 #include <linux/socket.h> /* linux/in.h needs this!! */ 53 #include <linux/in.h> /* We get struct sockaddr_in. */ 54 #include <linux/in6.h> /* We get struct in6_addr */ 55 #include <linux/ipv6.h> 56 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 57 #include <linux/atomic.h> /* This gets us atomic counters. */ 58 #include <linux/skbuff.h> /* We need sk_buff_head. */ 59 #include <linux/workqueue.h> /* We need tq_struct. */ 60 #include <linux/sctp.h> /* We need sctp* header structs. */ 61 #include <net/sctp/auth.h> /* We need auth specific structs */ 62 63 /* A convenience structure for handling sockaddr structures. 64 * We should wean ourselves off this. 65 */ 66 union sctp_addr { 67 struct sockaddr_in v4; 68 struct sockaddr_in6 v6; 69 struct sockaddr sa; 70 }; 71 72 /* Forward declarations for data structures. */ 73 struct sctp_globals; 74 struct sctp_endpoint; 75 struct sctp_association; 76 struct sctp_transport; 77 struct sctp_packet; 78 struct sctp_chunk; 79 struct sctp_inq; 80 struct sctp_outq; 81 struct sctp_bind_addr; 82 struct sctp_ulpq; 83 struct sctp_ep_common; 84 struct sctp_ssnmap; 85 struct crypto_shash; 86 87 88 #include <net/sctp/tsnmap.h> 89 #include <net/sctp/ulpevent.h> 90 #include <net/sctp/ulpqueue.h> 91 92 /* Structures useful for managing bind/connect. */ 93 94 struct sctp_bind_bucket { 95 unsigned short port; 96 unsigned short fastreuse; 97 struct hlist_node node; 98 struct hlist_head owner; 99 struct net *net; 100 }; 101 102 struct sctp_bind_hashbucket { 103 spinlock_t lock; 104 struct hlist_head chain; 105 }; 106 107 /* Used for hashing all associations. */ 108 struct sctp_hashbucket { 109 rwlock_t lock; 110 struct hlist_head chain; 111 } __attribute__((__aligned__(8))); 112 113 114 /* The SCTP globals structure. */ 115 extern struct sctp_globals { 116 /* This is a list of groups of functions for each address 117 * family that we support. 118 */ 119 struct list_head address_families; 120 121 /* This is the hash of all endpoints. */ 122 struct sctp_hashbucket *ep_hashtable; 123 /* This is the sctp port control hash. */ 124 struct sctp_bind_hashbucket *port_hashtable; 125 /* This is the hash of all transports. */ 126 struct rhashtable transport_hashtable; 127 128 /* Sizes of above hashtables. */ 129 int ep_hashsize; 130 int port_hashsize; 131 132 /* Default initialization values to be applied to new associations. */ 133 __u16 max_instreams; 134 __u16 max_outstreams; 135 136 /* Flag to indicate whether computing and verifying checksum 137 * is disabled. */ 138 bool checksum_disable; 139 } sctp_globals; 140 141 #define sctp_max_instreams (sctp_globals.max_instreams) 142 #define sctp_max_outstreams (sctp_globals.max_outstreams) 143 #define sctp_address_families (sctp_globals.address_families) 144 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 145 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 146 #define sctp_port_hashsize (sctp_globals.port_hashsize) 147 #define sctp_port_hashtable (sctp_globals.port_hashtable) 148 #define sctp_transport_hashtable (sctp_globals.transport_hashtable) 149 #define sctp_checksum_disable (sctp_globals.checksum_disable) 150 151 /* SCTP Socket type: UDP or TCP style. */ 152 typedef enum { 153 SCTP_SOCKET_UDP = 0, 154 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 155 SCTP_SOCKET_TCP 156 } sctp_socket_type_t; 157 158 /* Per socket SCTP information. */ 159 struct sctp_sock { 160 /* inet_sock has to be the first member of sctp_sock */ 161 struct inet_sock inet; 162 /* What kind of a socket is this? */ 163 sctp_socket_type_t type; 164 165 /* PF_ family specific functions. */ 166 struct sctp_pf *pf; 167 168 /* Access to HMAC transform. */ 169 struct crypto_shash *hmac; 170 char *sctp_hmac_alg; 171 172 /* What is our base endpointer? */ 173 struct sctp_endpoint *ep; 174 175 struct sctp_bind_bucket *bind_hash; 176 /* Various Socket Options. */ 177 __u16 default_stream; 178 __u32 default_ppid; 179 __u16 default_flags; 180 __u32 default_context; 181 __u32 default_timetolive; 182 __u32 default_rcv_context; 183 int max_burst; 184 185 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 186 * the destination address every heartbeat interval. This value 187 * will be inherited by all new associations. 188 */ 189 __u32 hbinterval; 190 191 /* This is the max_retrans value for new associations. */ 192 __u16 pathmaxrxt; 193 194 /* The initial Path MTU to use for new associations. */ 195 __u32 pathmtu; 196 197 /* The default SACK delay timeout for new associations. */ 198 __u32 sackdelay; 199 __u32 sackfreq; 200 201 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 202 __u32 param_flags; 203 204 struct sctp_initmsg initmsg; 205 struct sctp_rtoinfo rtoinfo; 206 struct sctp_paddrparams paddrparam; 207 struct sctp_event_subscribe subscribe; 208 struct sctp_assocparams assocparams; 209 210 int user_frag; 211 212 __u32 autoclose; 213 __u32 adaptation_ind; 214 __u32 pd_point; 215 __u16 nodelay:1, 216 disable_fragments:1, 217 v4mapped:1, 218 frag_interleave:1, 219 recvrcvinfo:1, 220 recvnxtinfo:1, 221 data_ready_signalled:1; 222 223 atomic_t pd_mode; 224 /* Receive to here while partial delivery is in effect. */ 225 struct sk_buff_head pd_lobby; 226 227 /* These must be the last fields, as they will skipped on copies, 228 * like on accept and peeloff operations 229 */ 230 struct list_head auto_asconf_list; 231 int do_auto_asconf; 232 }; 233 234 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 235 { 236 return (struct sctp_sock *)sk; 237 } 238 239 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 240 { 241 return (struct sock *)sp; 242 } 243 244 #if IS_ENABLED(CONFIG_IPV6) 245 struct sctp6_sock { 246 struct sctp_sock sctp; 247 struct ipv6_pinfo inet6; 248 }; 249 #endif /* CONFIG_IPV6 */ 250 251 252 /* This is our APPLICATION-SPECIFIC state cookie. 253 * THIS IS NOT DICTATED BY THE SPECIFICATION. 254 */ 255 /* These are the parts of an association which we send in the cookie. 256 * Most of these are straight out of: 257 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 258 * 259 */ 260 261 struct sctp_cookie { 262 263 /* My : Tag expected in every inbound packet and sent 264 * Verification: in the INIT or INIT ACK chunk. 265 * Tag : 266 */ 267 __u32 my_vtag; 268 269 /* Peer's : Tag expected in every outbound packet except 270 * Verification: in the INIT chunk. 271 * Tag : 272 */ 273 __u32 peer_vtag; 274 275 /* The rest of these are not from the spec, but really need to 276 * be in the cookie. 277 */ 278 279 /* My Tie Tag : Assist in discovering a restarting association. */ 280 __u32 my_ttag; 281 282 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 283 __u32 peer_ttag; 284 285 /* When does this cookie expire? */ 286 ktime_t expiration; 287 288 /* Number of inbound/outbound streams which are set 289 * and negotiated during the INIT process. 290 */ 291 __u16 sinit_num_ostreams; 292 __u16 sinit_max_instreams; 293 294 /* This is the first sequence number I used. */ 295 __u32 initial_tsn; 296 297 /* This holds the originating address of the INIT packet. */ 298 union sctp_addr peer_addr; 299 300 /* IG Section 2.35.3 301 * Include the source port of the INIT-ACK 302 */ 303 __u16 my_port; 304 305 __u8 prsctp_capable; 306 307 /* Padding for future use */ 308 __u8 padding; 309 310 __u32 adaptation_ind; 311 312 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 313 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 314 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 315 316 /* This is a shim for my peer's INIT packet, followed by 317 * a copy of the raw address list of the association. 318 * The length of the raw address list is saved in the 319 * raw_addr_list_len field, which will be used at the time when 320 * the association TCB is re-constructed from the cookie. 321 */ 322 __u32 raw_addr_list_len; 323 struct sctp_init_chunk peer_init[0]; 324 }; 325 326 327 /* The format of our cookie that we send to our peer. */ 328 struct sctp_signed_cookie { 329 __u8 signature[SCTP_SECRET_SIZE]; 330 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 331 struct sctp_cookie c; 332 } __packed; 333 334 /* This is another convenience type to allocate memory for address 335 * params for the maximum size and pass such structures around 336 * internally. 337 */ 338 union sctp_addr_param { 339 struct sctp_paramhdr p; 340 struct sctp_ipv4addr_param v4; 341 struct sctp_ipv6addr_param v6; 342 }; 343 344 /* A convenience type to allow walking through the various 345 * parameters and avoid casting all over the place. 346 */ 347 union sctp_params { 348 void *v; 349 struct sctp_paramhdr *p; 350 struct sctp_cookie_preserve_param *life; 351 struct sctp_hostname_param *dns; 352 struct sctp_cookie_param *cookie; 353 struct sctp_supported_addrs_param *sat; 354 struct sctp_ipv4addr_param *v4; 355 struct sctp_ipv6addr_param *v6; 356 union sctp_addr_param *addr; 357 struct sctp_adaptation_ind_param *aind; 358 struct sctp_supported_ext_param *ext; 359 struct sctp_random_param *random; 360 struct sctp_chunks_param *chunks; 361 struct sctp_hmac_algo_param *hmac_algo; 362 struct sctp_addip_param *addip; 363 }; 364 365 /* RFC 2960. Section 3.3.5 Heartbeat. 366 * Heartbeat Information: variable length 367 * The Sender-specific Heartbeat Info field should normally include 368 * information about the sender's current time when this HEARTBEAT 369 * chunk is sent and the destination transport address to which this 370 * HEARTBEAT is sent (see Section 8.3). 371 */ 372 typedef struct sctp_sender_hb_info { 373 struct sctp_paramhdr param_hdr; 374 union sctp_addr daddr; 375 unsigned long sent_at; 376 __u64 hb_nonce; 377 } __packed sctp_sender_hb_info_t; 378 379 /* 380 * RFC 2960 1.3.2 Sequenced Delivery within Streams 381 * 382 * The term "stream" is used in SCTP to refer to a sequence of user 383 * messages that are to be delivered to the upper-layer protocol in 384 * order with respect to other messages within the same stream. This is 385 * in contrast to its usage in TCP, where it refers to a sequence of 386 * bytes (in this document a byte is assumed to be eight bits). 387 * ... 388 * 389 * This is the structure we use to track both our outbound and inbound 390 * SSN, or Stream Sequence Numbers. 391 */ 392 393 struct sctp_stream { 394 __u16 *ssn; 395 unsigned int len; 396 }; 397 398 struct sctp_ssnmap { 399 struct sctp_stream in; 400 struct sctp_stream out; 401 }; 402 403 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 404 gfp_t gfp); 405 void sctp_ssnmap_free(struct sctp_ssnmap *map); 406 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 407 408 /* What is the current SSN number for this stream? */ 409 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 410 { 411 return stream->ssn[id]; 412 } 413 414 /* Return the next SSN number for this stream. */ 415 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 416 { 417 return stream->ssn[id]++; 418 } 419 420 /* Skip over this ssn and all below. */ 421 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 422 __u16 ssn) 423 { 424 stream->ssn[id] = ssn+1; 425 } 426 427 /* 428 * Pointers to address related SCTP functions. 429 * (i.e. things that depend on the address family.) 430 */ 431 struct sctp_af { 432 int (*sctp_xmit) (struct sk_buff *skb, 433 struct sctp_transport *); 434 int (*setsockopt) (struct sock *sk, 435 int level, 436 int optname, 437 char __user *optval, 438 unsigned int optlen); 439 int (*getsockopt) (struct sock *sk, 440 int level, 441 int optname, 442 char __user *optval, 443 int __user *optlen); 444 int (*compat_setsockopt) (struct sock *sk, 445 int level, 446 int optname, 447 char __user *optval, 448 unsigned int optlen); 449 int (*compat_getsockopt) (struct sock *sk, 450 int level, 451 int optname, 452 char __user *optval, 453 int __user *optlen); 454 void (*get_dst) (struct sctp_transport *t, 455 union sctp_addr *saddr, 456 struct flowi *fl, 457 struct sock *sk); 458 void (*get_saddr) (struct sctp_sock *sk, 459 struct sctp_transport *t, 460 struct flowi *fl); 461 void (*copy_addrlist) (struct list_head *, 462 struct net_device *); 463 int (*cmp_addr) (const union sctp_addr *addr1, 464 const union sctp_addr *addr2); 465 void (*addr_copy) (union sctp_addr *dst, 466 union sctp_addr *src); 467 void (*from_skb) (union sctp_addr *, 468 struct sk_buff *skb, 469 int saddr); 470 void (*from_sk) (union sctp_addr *, 471 struct sock *sk); 472 void (*from_addr_param) (union sctp_addr *, 473 union sctp_addr_param *, 474 __be16 port, int iif); 475 int (*to_addr_param) (const union sctp_addr *, 476 union sctp_addr_param *); 477 int (*addr_valid) (union sctp_addr *, 478 struct sctp_sock *, 479 const struct sk_buff *); 480 sctp_scope_t (*scope) (union sctp_addr *); 481 void (*inaddr_any) (union sctp_addr *, __be16); 482 int (*is_any) (const union sctp_addr *); 483 int (*available) (union sctp_addr *, 484 struct sctp_sock *); 485 int (*skb_iif) (const struct sk_buff *sk); 486 int (*is_ce) (const struct sk_buff *sk); 487 void (*seq_dump_addr)(struct seq_file *seq, 488 union sctp_addr *addr); 489 void (*ecn_capable)(struct sock *sk); 490 __u16 net_header_len; 491 int sockaddr_len; 492 sa_family_t sa_family; 493 struct list_head list; 494 }; 495 496 struct sctp_af *sctp_get_af_specific(sa_family_t); 497 int sctp_register_af(struct sctp_af *); 498 499 /* Protocol family functions. */ 500 struct sctp_pf { 501 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 502 void (*skb_msgname) (struct sk_buff *, char *, int *); 503 int (*af_supported) (sa_family_t, struct sctp_sock *); 504 int (*cmp_addr) (const union sctp_addr *, 505 const union sctp_addr *, 506 struct sctp_sock *); 507 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 508 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 509 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 510 struct sock *(*create_accept_sk) (struct sock *sk, 511 struct sctp_association *asoc); 512 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 513 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 514 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 515 struct sctp_af *af; 516 }; 517 518 519 /* Structure to track chunk fragments that have been acked, but peer 520 * fragments of the same message have not. 521 */ 522 struct sctp_datamsg { 523 /* Chunks waiting to be submitted to lower layer. */ 524 struct list_head chunks; 525 /* Reference counting. */ 526 atomic_t refcnt; 527 /* When is this message no longer interesting to the peer? */ 528 unsigned long expires_at; 529 /* Did the messenge fail to send? */ 530 int send_error; 531 u8 send_failed:1, 532 can_abandon:1, /* can chunks from this message can be abandoned. */ 533 can_delay; /* should this message be Nagle delayed */ 534 }; 535 536 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 537 struct sctp_sndrcvinfo *, 538 struct iov_iter *); 539 void sctp_datamsg_put(struct sctp_datamsg *); 540 void sctp_chunk_fail(struct sctp_chunk *, int error); 541 int sctp_chunk_abandoned(struct sctp_chunk *); 542 543 /* RFC2960 1.4 Key Terms 544 * 545 * o Chunk: A unit of information within an SCTP packet, consisting of 546 * a chunk header and chunk-specific content. 547 * 548 * As a matter of convenience, we remember the SCTP common header for 549 * each chunk as well as a few other header pointers... 550 */ 551 struct sctp_chunk { 552 struct list_head list; 553 554 atomic_t refcnt; 555 556 /* This is our link to the per-transport transmitted list. */ 557 struct list_head transmitted_list; 558 559 /* This field is used by chunks that hold fragmented data. 560 * For the first fragment this is the list that holds the rest of 561 * fragments. For the remaining fragments, this is the link to the 562 * frag_list maintained in the first fragment. 563 */ 564 struct list_head frag_list; 565 566 /* This points to the sk_buff containing the actual data. */ 567 struct sk_buff *skb; 568 569 /* In case of GSO packets, this will store the head one */ 570 struct sk_buff *head_skb; 571 572 /* These are the SCTP headers by reverse order in a packet. 573 * Note that some of these may happen more than once. In that 574 * case, we point at the "current" one, whatever that means 575 * for that level of header. 576 */ 577 578 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 579 union sctp_params param_hdr; 580 union { 581 __u8 *v; 582 struct sctp_datahdr *data_hdr; 583 struct sctp_inithdr *init_hdr; 584 struct sctp_sackhdr *sack_hdr; 585 struct sctp_heartbeathdr *hb_hdr; 586 struct sctp_sender_hb_info *hbs_hdr; 587 struct sctp_shutdownhdr *shutdown_hdr; 588 struct sctp_signed_cookie *cookie_hdr; 589 struct sctp_ecnehdr *ecne_hdr; 590 struct sctp_cwrhdr *ecn_cwr_hdr; 591 struct sctp_errhdr *err_hdr; 592 struct sctp_addiphdr *addip_hdr; 593 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 594 struct sctp_authhdr *auth_hdr; 595 } subh; 596 597 __u8 *chunk_end; 598 599 struct sctp_chunkhdr *chunk_hdr; 600 struct sctphdr *sctp_hdr; 601 602 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 603 struct sctp_sndrcvinfo sinfo; 604 605 /* Which association does this belong to? */ 606 struct sctp_association *asoc; 607 608 /* What endpoint received this chunk? */ 609 struct sctp_ep_common *rcvr; 610 611 /* We fill this in if we are calculating RTT. */ 612 unsigned long sent_at; 613 614 /* What is the origin IP address for this chunk? */ 615 union sctp_addr source; 616 /* Destination address for this chunk. */ 617 union sctp_addr dest; 618 619 /* For outbound message, track all fragments for SEND_FAILED. */ 620 struct sctp_datamsg *msg; 621 622 /* For an inbound chunk, this tells us where it came from. 623 * For an outbound chunk, it tells us where we'd like it to 624 * go. It is NULL if we have no preference. 625 */ 626 struct sctp_transport *transport; 627 628 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 629 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 630 * spec violates the principle premis that all chunks are processed 631 * in order. 632 */ 633 struct sk_buff *auth_chunk; 634 635 #define SCTP_CAN_FRTX 0x0 636 #define SCTP_NEED_FRTX 0x1 637 #define SCTP_DONT_FRTX 0x2 638 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 639 resent:1, /* Has this chunk ever been resent. */ 640 has_tsn:1, /* Does this chunk have a TSN yet? */ 641 has_ssn:1, /* Does this chunk have a SSN yet? */ 642 singleton:1, /* Only chunk in the packet? */ 643 end_of_packet:1, /* Last chunk in the packet? */ 644 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 645 pdiscard:1, /* Discard the whole packet now? */ 646 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 647 data_accepted:1, /* At least 1 chunk accepted */ 648 auth:1, /* IN: was auth'ed | OUT: needs auth */ 649 has_asconf:1, /* IN: have seen an asconf before */ 650 tsn_missing_report:2, /* Data chunk missing counter. */ 651 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 652 }; 653 654 void sctp_chunk_hold(struct sctp_chunk *); 655 void sctp_chunk_put(struct sctp_chunk *); 656 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 657 struct iov_iter *from); 658 void sctp_chunk_free(struct sctp_chunk *); 659 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 660 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 661 const struct sctp_association *, 662 struct sock *, gfp_t gfp); 663 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 664 union sctp_addr *); 665 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 666 667 enum { 668 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 669 SCTP_ADDR_SRC, /* address can be used as source */ 670 SCTP_ADDR_DEL, /* address about to be deleted */ 671 }; 672 673 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 674 struct sctp_sockaddr_entry { 675 struct list_head list; 676 struct rcu_head rcu; 677 union sctp_addr a; 678 __u8 state; 679 __u8 valid; 680 }; 681 682 #define SCTP_ADDRESS_TICK_DELAY 500 683 684 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 685 686 /* This structure holds lists of chunks as we are assembling for 687 * transmission. 688 */ 689 struct sctp_packet { 690 /* These are the SCTP header values (host order) for the packet. */ 691 __u16 source_port; 692 __u16 destination_port; 693 __u32 vtag; 694 695 /* This contains the payload chunks. */ 696 struct list_head chunk_list; 697 698 /* This is the overhead of the sctp and ip headers. */ 699 size_t overhead; 700 /* This is the total size of all chunks INCLUDING padding. */ 701 size_t size; 702 /* This is the maximum size this packet may have */ 703 size_t max_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 }; 720 721 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 722 struct sctp_transport *, 723 __u16 sport, __u16 dport); 724 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 725 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 726 struct sctp_chunk *, int, gfp_t); 727 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 728 struct sctp_chunk *); 729 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 730 void sctp_packet_free(struct sctp_packet *); 731 732 static inline int sctp_packet_empty(struct sctp_packet *packet) 733 { 734 return packet->size == packet->overhead; 735 } 736 737 /* This represents a remote transport address. 738 * For local transport addresses, we just use union sctp_addr. 739 * 740 * RFC2960 Section 1.4 Key Terms 741 * 742 * o Transport address: A Transport Address is traditionally defined 743 * by Network Layer address, Transport Layer protocol and Transport 744 * Layer port number. In the case of SCTP running over IP, a 745 * transport address is defined by the combination of an IP address 746 * and an SCTP port number (where SCTP is the Transport protocol). 747 * 748 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 749 * 750 * o The sender keeps a separate congestion control parameter set for 751 * each of the destination addresses it can send to (not each 752 * source-destination pair but for each destination). The parameters 753 * should decay if the address is not used for a long enough time 754 * period. 755 * 756 */ 757 struct sctp_transport { 758 /* A list of transports. */ 759 struct list_head transports; 760 struct rhash_head node; 761 762 /* Reference counting. */ 763 atomic_t refcnt; 764 /* RTO-Pending : A flag used to track if one of the DATA 765 * chunks sent to this address is currently being 766 * used to compute a RTT. If this flag is 0, 767 * the next DATA chunk sent to this destination 768 * should be used to compute a RTT and this flag 769 * should be set. Every time the RTT 770 * calculation completes (i.e. the DATA chunk 771 * is SACK'd) clear this flag. 772 */ 773 __u32 rto_pending:1, 774 775 /* 776 * hb_sent : a flag that signals that we have a pending 777 * heartbeat. 778 */ 779 hb_sent:1, 780 781 /* Is the Path MTU update pending on this tranport */ 782 pmtu_pending:1, 783 784 /* Has this transport moved the ctsn since we last sacked */ 785 sack_generation:1; 786 u32 dst_cookie; 787 788 struct flowi fl; 789 790 /* This is the peer's IP address and port. */ 791 union sctp_addr ipaddr; 792 793 /* These are the functions we call to handle LLP stuff. */ 794 struct sctp_af *af_specific; 795 796 /* Which association do we belong to? */ 797 struct sctp_association *asoc; 798 799 /* RFC2960 800 * 801 * 12.3 Per Transport Address Data 802 * 803 * For each destination transport address in the peer's 804 * address list derived from the INIT or INIT ACK chunk, a 805 * number of data elements needs to be maintained including: 806 */ 807 /* RTO : The current retransmission timeout value. */ 808 unsigned long rto; 809 810 __u32 rtt; /* This is the most recent RTT. */ 811 812 /* RTTVAR : The current RTT variation. */ 813 __u32 rttvar; 814 815 /* SRTT : The current smoothed round trip time. */ 816 __u32 srtt; 817 818 /* 819 * These are the congestion stats. 820 */ 821 /* cwnd : The current congestion window. */ 822 __u32 cwnd; /* This is the actual cwnd. */ 823 824 /* ssthresh : The current slow start threshold value. */ 825 __u32 ssthresh; 826 827 /* partial : The tracking method for increase of cwnd when in 828 * bytes acked : congestion avoidance mode (see Section 6.2.2) 829 */ 830 __u32 partial_bytes_acked; 831 832 /* Data that has been sent, but not acknowledged. */ 833 __u32 flight_size; 834 835 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 836 837 /* Destination */ 838 struct dst_entry *dst; 839 /* Source address. */ 840 union sctp_addr saddr; 841 842 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 843 * the destination address every heartbeat interval. 844 */ 845 unsigned long hbinterval; 846 847 /* SACK delay timeout */ 848 unsigned long sackdelay; 849 __u32 sackfreq; 850 851 /* When was the last time that we heard from this transport? We use 852 * this to pick new active and retran paths. 853 */ 854 ktime_t last_time_heard; 855 856 /* When was the last time that we sent a chunk using this 857 * transport? We use this to check for idle transports 858 */ 859 unsigned long last_time_sent; 860 861 /* Last time(in jiffies) when cwnd is reduced due to the congestion 862 * indication based on ECNE chunk. 863 */ 864 unsigned long last_time_ecne_reduced; 865 866 /* This is the max_retrans value for the transport and will 867 * be initialized from the assocs value. This can be changed 868 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 869 */ 870 __u16 pathmaxrxt; 871 872 /* This is the partially failed retrans value for the transport 873 * and will be initialized from the assocs value. This can be changed 874 * using the SCTP_PEER_ADDR_THLDS socket option 875 */ 876 int pf_retrans; 877 /* PMTU : The current known path MTU. */ 878 __u32 pathmtu; 879 880 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 881 __u32 param_flags; 882 883 /* The number of times INIT has been sent on this transport. */ 884 int init_sent_count; 885 886 /* state : The current state of this destination, 887 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 888 */ 889 int state; 890 891 /* These are the error stats for this destination. */ 892 893 /* Error count : The current error count for this destination. */ 894 unsigned short error_count; 895 896 /* Per : A timer used by each destination. 897 * Destination : 898 * Timer : 899 * 900 * [Everywhere else in the text this is called T3-rtx. -ed] 901 */ 902 struct timer_list T3_rtx_timer; 903 904 /* Heartbeat timer is per destination. */ 905 struct timer_list hb_timer; 906 907 /* Timer to handle ICMP proto unreachable envets */ 908 struct timer_list proto_unreach_timer; 909 910 /* Since we're using per-destination retransmission timers 911 * (see above), we're also using per-destination "transmitted" 912 * queues. This probably ought to be a private struct 913 * accessible only within the outqueue, but it's not, yet. 914 */ 915 struct list_head transmitted; 916 917 /* We build bundle-able packets for this transport here. */ 918 struct sctp_packet packet; 919 920 /* This is the list of transports that have chunks to send. */ 921 struct list_head send_ready; 922 923 /* State information saved for SFR_CACC algorithm. The key 924 * idea in SFR_CACC is to maintain state at the sender on a 925 * per-destination basis when a changeover happens. 926 * char changeover_active; 927 * char cycling_changeover; 928 * __u32 next_tsn_at_change; 929 * char cacc_saw_newack; 930 */ 931 struct { 932 /* An unsigned integer, which stores the next TSN to be 933 * used by the sender, at the moment of changeover. 934 */ 935 __u32 next_tsn_at_change; 936 937 /* A flag which indicates the occurrence of a changeover */ 938 char changeover_active; 939 940 /* A flag which indicates whether the change of primary is 941 * the first switch to this destination address during an 942 * active switch. 943 */ 944 char cycling_changeover; 945 946 /* A temporary flag, which is used during the processing of 947 * a SACK to estimate the causative TSN(s)'s group. 948 */ 949 char cacc_saw_newack; 950 } cacc; 951 952 /* 64-bit random number sent with heartbeat. */ 953 __u64 hb_nonce; 954 955 struct rcu_head rcu; 956 }; 957 958 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 959 gfp_t); 960 void sctp_transport_set_owner(struct sctp_transport *, 961 struct sctp_association *); 962 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 963 struct sctp_sock *); 964 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 965 void sctp_transport_free(struct sctp_transport *); 966 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 967 void sctp_transport_reset_hb_timer(struct sctp_transport *); 968 int sctp_transport_hold(struct sctp_transport *); 969 void sctp_transport_put(struct sctp_transport *); 970 void sctp_transport_update_rto(struct sctp_transport *, __u32); 971 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 972 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 973 void sctp_transport_burst_limited(struct sctp_transport *); 974 void sctp_transport_burst_reset(struct sctp_transport *); 975 unsigned long sctp_transport_timeout(struct sctp_transport *); 976 void sctp_transport_reset(struct sctp_transport *); 977 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); 978 void sctp_transport_immediate_rtx(struct sctp_transport *); 979 980 981 /* This is the structure we use to queue packets as they come into 982 * SCTP. We write packets to it and read chunks from it. 983 */ 984 struct sctp_inq { 985 /* This is actually a queue of sctp_chunk each 986 * containing a partially decoded packet. 987 */ 988 struct list_head in_chunk_list; 989 /* This is the packet which is currently off the in queue and is 990 * being worked on through the inbound chunk processing. 991 */ 992 struct sctp_chunk *in_progress; 993 994 /* This is the delayed task to finish delivering inbound 995 * messages. 996 */ 997 struct work_struct immediate; 998 }; 999 1000 void sctp_inq_init(struct sctp_inq *); 1001 void sctp_inq_free(struct sctp_inq *); 1002 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1003 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1004 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1005 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1006 1007 /* This is the structure we use to hold outbound chunks. You push 1008 * chunks in and they automatically pop out the other end as bundled 1009 * packets (it calls (*output_handler)()). 1010 * 1011 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1012 * and 8.2 of the v13 draft. 1013 * 1014 * It handles retransmissions. The connection to the timeout portion 1015 * of the state machine is through sctp_..._timeout() and timeout_handler. 1016 * 1017 * If you feed it SACKs, it will eat them. 1018 * 1019 * If you give it big chunks, it will fragment them. 1020 * 1021 * It assigns TSN's to data chunks. This happens at the last possible 1022 * instant before transmission. 1023 * 1024 * When free()'d, it empties itself out via output_handler(). 1025 */ 1026 struct sctp_outq { 1027 struct sctp_association *asoc; 1028 1029 /* Data pending that has never been transmitted. */ 1030 struct list_head out_chunk_list; 1031 1032 unsigned int out_qlen; /* Total length of queued data chunks. */ 1033 1034 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1035 unsigned int error; 1036 1037 /* These are control chunks we want to send. */ 1038 struct list_head control_chunk_list; 1039 1040 /* These are chunks that have been sacked but are above the 1041 * CTSN, or cumulative tsn ack point. 1042 */ 1043 struct list_head sacked; 1044 1045 /* Put chunks on this list to schedule them for 1046 * retransmission. 1047 */ 1048 struct list_head retransmit; 1049 1050 /* Put chunks on this list to save them for FWD TSN processing as 1051 * they were abandoned. 1052 */ 1053 struct list_head abandoned; 1054 1055 /* How many unackd bytes do we have in-flight? */ 1056 __u32 outstanding_bytes; 1057 1058 /* Are we doing fast-rtx on this queue */ 1059 char fast_rtx; 1060 1061 /* Corked? */ 1062 char cork; 1063 }; 1064 1065 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1066 void sctp_outq_teardown(struct sctp_outq *); 1067 void sctp_outq_free(struct sctp_outq*); 1068 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1069 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1070 int sctp_outq_is_empty(const struct sctp_outq *); 1071 void sctp_outq_restart(struct sctp_outq *); 1072 1073 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1074 sctp_retransmit_reason_t); 1075 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1076 int sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1077 /* Uncork and flush an outqueue. */ 1078 static inline void sctp_outq_cork(struct sctp_outq *q) 1079 { 1080 q->cork = 1; 1081 } 1082 1083 /* These bind address data fields common between endpoints and associations */ 1084 struct sctp_bind_addr { 1085 1086 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1087 * 1088 * SCTP Port: The local SCTP port number the endpoint is 1089 * bound to. 1090 */ 1091 __u16 port; 1092 1093 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1094 * 1095 * Address List: The list of IP addresses that this instance 1096 * has bound. This information is passed to one's 1097 * peer(s) in INIT and INIT ACK chunks. 1098 */ 1099 struct list_head address_list; 1100 }; 1101 1102 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1103 void sctp_bind_addr_free(struct sctp_bind_addr *); 1104 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1105 const struct sctp_bind_addr *src, 1106 sctp_scope_t scope, gfp_t gfp, 1107 int flags); 1108 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1109 const struct sctp_bind_addr *src, 1110 gfp_t gfp); 1111 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1112 int new_size, __u8 addr_state, gfp_t gfp); 1113 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1114 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1115 struct sctp_sock *); 1116 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1117 struct sctp_sock *, struct sctp_sock *); 1118 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1119 const union sctp_addr *addr); 1120 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1121 const union sctp_addr *addrs, 1122 int addrcnt, 1123 struct sctp_sock *opt); 1124 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1125 int *addrs_len, 1126 gfp_t gfp); 1127 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1128 __u16 port, gfp_t gfp); 1129 1130 sctp_scope_t sctp_scope(const union sctp_addr *); 1131 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1132 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1133 int sctp_is_ep_boundall(struct sock *sk); 1134 1135 1136 /* What type of endpoint? */ 1137 typedef enum { 1138 SCTP_EP_TYPE_SOCKET, 1139 SCTP_EP_TYPE_ASSOCIATION, 1140 } sctp_endpoint_type_t; 1141 1142 /* 1143 * A common base class to bridge the implmentation view of a 1144 * socket (usually listening) endpoint versus an association's 1145 * local endpoint. 1146 * This common structure is useful for several purposes: 1147 * 1) Common interface for lookup routines. 1148 * a) Subfunctions work for either endpoint or association 1149 * b) Single interface to lookup allows hiding the lookup lock rather 1150 * than acquiring it externally. 1151 * 2) Common interface for the inbound chunk handling/state machine. 1152 * 3) Common object handling routines for reference counting, etc. 1153 * 4) Disentangle association lookup from endpoint lookup, where we 1154 * do not have to find our endpoint to find our association. 1155 * 1156 */ 1157 1158 struct sctp_ep_common { 1159 /* Fields to help us manage our entries in the hash tables. */ 1160 struct hlist_node node; 1161 int hashent; 1162 1163 /* Runtime type information. What kind of endpoint is this? */ 1164 sctp_endpoint_type_t type; 1165 1166 /* Some fields to help us manage this object. 1167 * refcnt - Reference count access to this object. 1168 * dead - Do not attempt to use this object. 1169 */ 1170 atomic_t refcnt; 1171 bool dead; 1172 1173 /* What socket does this endpoint belong to? */ 1174 struct sock *sk; 1175 1176 /* This is where we receive inbound chunks. */ 1177 struct sctp_inq inqueue; 1178 1179 /* This substructure includes the defining parameters of the 1180 * endpoint: 1181 * bind_addr.port is our shared port number. 1182 * bind_addr.address_list is our set of local IP addresses. 1183 */ 1184 struct sctp_bind_addr bind_addr; 1185 }; 1186 1187 1188 /* RFC Section 1.4 Key Terms 1189 * 1190 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1191 * multi-homed host, an SCTP endpoint is represented to its peers as a 1192 * combination of a set of eligible destination transport addresses to 1193 * which SCTP packets can be sent and a set of eligible source 1194 * transport addresses from which SCTP packets can be received. 1195 * All transport addresses used by an SCTP endpoint must use the 1196 * same port number, but can use multiple IP addresses. A transport 1197 * address used by an SCTP endpoint must not be used by another 1198 * SCTP endpoint. In other words, a transport address is unique 1199 * to an SCTP endpoint. 1200 * 1201 * From an implementation perspective, each socket has one of these. 1202 * A TCP-style socket will have exactly one association on one of 1203 * these. An UDP-style socket will have multiple associations hanging 1204 * off one of these. 1205 */ 1206 1207 struct sctp_endpoint { 1208 /* Common substructure for endpoint and association. */ 1209 struct sctp_ep_common base; 1210 1211 /* Associations: A list of current associations and mappings 1212 * to the data consumers for each association. This 1213 * may be in the form of a hash table or other 1214 * implementation dependent structure. The data 1215 * consumers may be process identification 1216 * information such as file descriptors, named pipe 1217 * pointer, or table pointers dependent on how SCTP 1218 * is implemented. 1219 */ 1220 /* This is really a list of struct sctp_association entries. */ 1221 struct list_head asocs; 1222 1223 /* Secret Key: A secret key used by this endpoint to compute 1224 * the MAC. This SHOULD be a cryptographic quality 1225 * random number with a sufficient length. 1226 * Discussion in [RFC1750] can be helpful in 1227 * selection of the key. 1228 */ 1229 __u8 secret_key[SCTP_SECRET_SIZE]; 1230 1231 /* digest: This is a digest of the sctp cookie. This field is 1232 * only used on the receive path when we try to validate 1233 * that the cookie has not been tampered with. We put 1234 * this here so we pre-allocate this once and can re-use 1235 * on every receive. 1236 */ 1237 __u8 *digest; 1238 1239 /* sendbuf acct. policy. */ 1240 __u32 sndbuf_policy; 1241 1242 /* rcvbuf acct. policy. */ 1243 __u32 rcvbuf_policy; 1244 1245 /* SCTP AUTH: array of the HMACs that will be allocated 1246 * we need this per association so that we don't serialize 1247 */ 1248 struct crypto_shash **auth_hmacs; 1249 1250 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1251 struct sctp_hmac_algo_param *auth_hmacs_list; 1252 1253 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1254 struct sctp_chunks_param *auth_chunk_list; 1255 1256 /* SCTP-AUTH: endpoint shared keys */ 1257 struct list_head endpoint_shared_keys; 1258 __u16 active_key_id; 1259 __u8 auth_enable; 1260 }; 1261 1262 /* Recover the outter endpoint structure. */ 1263 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1264 { 1265 struct sctp_endpoint *ep; 1266 1267 ep = container_of(base, struct sctp_endpoint, base); 1268 return ep; 1269 } 1270 1271 /* These are function signatures for manipulating endpoints. */ 1272 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1273 void sctp_endpoint_free(struct sctp_endpoint *); 1274 void sctp_endpoint_put(struct sctp_endpoint *); 1275 void sctp_endpoint_hold(struct sctp_endpoint *); 1276 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1277 struct sctp_association *sctp_endpoint_lookup_assoc( 1278 const struct sctp_endpoint *ep, 1279 const union sctp_addr *paddr, 1280 struct sctp_transport **); 1281 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1282 const union sctp_addr *); 1283 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1284 struct net *, const union sctp_addr *); 1285 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1286 const union sctp_addr *paddr); 1287 1288 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1289 const struct sctp_association *asoc, 1290 sctp_cid_t, sctp_init_chunk_t *peer_init, 1291 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1292 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1293 const union sctp_addr *peer, 1294 sctp_init_chunk_t *init, gfp_t gfp); 1295 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1296 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1297 1298 struct sctp_inithdr_host { 1299 __u32 init_tag; 1300 __u32 a_rwnd; 1301 __u16 num_outbound_streams; 1302 __u16 num_inbound_streams; 1303 __u32 initial_tsn; 1304 }; 1305 1306 /* SCTP_GET_ASSOC_STATS counters */ 1307 struct sctp_priv_assoc_stats { 1308 /* Maximum observed rto in the association during subsequent 1309 * observations. Value is set to 0 if no RTO measurement took place 1310 * The transport where the max_rto was observed is returned in 1311 * obs_rto_ipaddr 1312 */ 1313 struct sockaddr_storage obs_rto_ipaddr; 1314 __u64 max_obs_rto; 1315 /* Total In and Out SACKs received and sent */ 1316 __u64 isacks; 1317 __u64 osacks; 1318 /* Total In and Out packets received and sent */ 1319 __u64 opackets; 1320 __u64 ipackets; 1321 /* Total retransmitted chunks */ 1322 __u64 rtxchunks; 1323 /* TSN received > next expected */ 1324 __u64 outofseqtsns; 1325 /* Duplicate Chunks received */ 1326 __u64 idupchunks; 1327 /* Gap Ack Blocks received */ 1328 __u64 gapcnt; 1329 /* Unordered data chunks sent and received */ 1330 __u64 ouodchunks; 1331 __u64 iuodchunks; 1332 /* Ordered data chunks sent and received */ 1333 __u64 oodchunks; 1334 __u64 iodchunks; 1335 /* Control chunks sent and received */ 1336 __u64 octrlchunks; 1337 __u64 ictrlchunks; 1338 }; 1339 1340 /* RFC2960 1341 * 1342 * 12. Recommended Transmission Control Block (TCB) Parameters 1343 * 1344 * This section details a recommended set of parameters that should 1345 * be contained within the TCB for an implementation. This section is 1346 * for illustrative purposes and should not be deemed as requirements 1347 * on an implementation or as an exhaustive list of all parameters 1348 * inside an SCTP TCB. Each implementation may need its own additional 1349 * parameters for optimization. 1350 */ 1351 1352 1353 /* Here we have information about each individual association. */ 1354 struct sctp_association { 1355 1356 /* A base structure common to endpoint and association. 1357 * In this context, it represents the associations's view 1358 * of the local endpoint of the association. 1359 */ 1360 struct sctp_ep_common base; 1361 1362 /* Associations on the same socket. */ 1363 struct list_head asocs; 1364 1365 /* association id. */ 1366 sctp_assoc_t assoc_id; 1367 1368 /* This is our parent endpoint. */ 1369 struct sctp_endpoint *ep; 1370 1371 /* These are those association elements needed in the cookie. */ 1372 struct sctp_cookie c; 1373 1374 /* This is all information about our peer. */ 1375 struct { 1376 /* transport_addr_list 1377 * 1378 * Peer : A list of SCTP transport addresses that the 1379 * Transport : peer is bound to. This information is derived 1380 * Address : from the INIT or INIT ACK and is used to 1381 * List : associate an inbound packet with a given 1382 * : association. Normally this information is 1383 * : hashed or keyed for quick lookup and access 1384 * : of the TCB. 1385 * : The list is also initialized with the list 1386 * : of addresses passed with the sctp_connectx() 1387 * : call. 1388 * 1389 * It is a list of SCTP_transport's. 1390 */ 1391 struct list_head transport_addr_list; 1392 1393 /* rwnd 1394 * 1395 * Peer Rwnd : Current calculated value of the peer's rwnd. 1396 */ 1397 __u32 rwnd; 1398 1399 /* transport_count 1400 * 1401 * Peer : A count of the number of peer addresses 1402 * Transport : in the Peer Transport Address List. 1403 * Address : 1404 * Count : 1405 */ 1406 __u16 transport_count; 1407 1408 /* port 1409 * The transport layer port number. 1410 */ 1411 __u16 port; 1412 1413 /* primary_path 1414 * 1415 * Primary : This is the current primary destination 1416 * Path : transport address of the peer endpoint. It 1417 * : may also specify a source transport address 1418 * : on this endpoint. 1419 * 1420 * All of these paths live on transport_addr_list. 1421 * 1422 * At the bakeoffs, we discovered that the intent of 1423 * primaryPath is that it only changes when the ULP 1424 * asks to have it changed. We add the activePath to 1425 * designate the connection we are currently using to 1426 * transmit new data and most control chunks. 1427 */ 1428 struct sctp_transport *primary_path; 1429 1430 /* Cache the primary path address here, when we 1431 * need a an address for msg_name. 1432 */ 1433 union sctp_addr primary_addr; 1434 1435 /* active_path 1436 * The path that we are currently using to 1437 * transmit new data and most control chunks. 1438 */ 1439 struct sctp_transport *active_path; 1440 1441 /* retran_path 1442 * 1443 * RFC2960 6.4 Multi-homed SCTP Endpoints 1444 * ... 1445 * Furthermore, when its peer is multi-homed, an 1446 * endpoint SHOULD try to retransmit a chunk to an 1447 * active destination transport address that is 1448 * different from the last destination address to 1449 * which the DATA chunk was sent. 1450 */ 1451 struct sctp_transport *retran_path; 1452 1453 /* Pointer to last transport I have sent on. */ 1454 struct sctp_transport *last_sent_to; 1455 1456 /* This is the last transport I have received DATA on. */ 1457 struct sctp_transport *last_data_from; 1458 1459 /* 1460 * Mapping An array of bits or bytes indicating which out of 1461 * Array order TSN's have been received (relative to the 1462 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1463 * order packets have been received, this array 1464 * will be set to all zero. This structure may be 1465 * in the form of a circular buffer or bit array. 1466 * 1467 * Last Rcvd : This is the last TSN received in 1468 * TSN : sequence. This value is set initially by 1469 * : taking the peer's Initial TSN, received in 1470 * : the INIT or INIT ACK chunk, and subtracting 1471 * : one from it. 1472 * 1473 * Throughout most of the specification this is called the 1474 * "Cumulative TSN ACK Point". In this case, we 1475 * ignore the advice in 12.2 in favour of the term 1476 * used in the bulk of the text. This value is hidden 1477 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1478 */ 1479 struct sctp_tsnmap tsn_map; 1480 1481 /* This mask is used to disable sending the ASCONF chunk 1482 * with specified parameter to peer. 1483 */ 1484 __be16 addip_disabled_mask; 1485 1486 /* These are capabilities which our peer advertised. */ 1487 __u8 ecn_capable:1, /* Can peer do ECN? */ 1488 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1489 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1490 hostname_address:1, /* Peer understands DNS addresses? */ 1491 asconf_capable:1, /* Does peer support ADDIP? */ 1492 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1493 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1494 1495 /* sack_needed : This flag indicates if the next received 1496 * : packet is to be responded to with a 1497 * : SACK. This is initialized to 0. When a packet 1498 * : is received sack_cnt is incremented. If this value 1499 * : reaches 2 or more, a SACK is sent and the 1500 * : value is reset to 0. Note: This is used only 1501 * : when no DATA chunks are received out of 1502 * : order. When DATA chunks are out of order, 1503 * : SACK's are not delayed (see Section 6). 1504 */ 1505 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1506 sack_generation:1, 1507 zero_window_announced:1; 1508 __u32 sack_cnt; 1509 1510 __u32 adaptation_ind; /* Adaptation Code point. */ 1511 1512 struct sctp_inithdr_host i; 1513 void *cookie; 1514 int cookie_len; 1515 1516 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1517 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1518 * Initial TSN Value minus 1 1519 */ 1520 __u32 addip_serial; 1521 1522 /* SCTP-AUTH: We need to know pears random number, hmac list 1523 * and authenticated chunk list. All that is part of the 1524 * cookie and these are just pointers to those locations 1525 */ 1526 sctp_random_param_t *peer_random; 1527 sctp_chunks_param_t *peer_chunks; 1528 sctp_hmac_algo_param_t *peer_hmacs; 1529 } peer; 1530 1531 /* State : A state variable indicating what state the 1532 * : association is in, i.e. COOKIE-WAIT, 1533 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1534 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1535 * 1536 * Note: No "CLOSED" state is illustrated since if a 1537 * association is "CLOSED" its TCB SHOULD be removed. 1538 * 1539 * In this implementation we DO have a CLOSED 1540 * state which is used during initiation and shutdown. 1541 * 1542 * State takes values from SCTP_STATE_*. 1543 */ 1544 sctp_state_t state; 1545 1546 /* Overall : The overall association error count. 1547 * Error Count : [Clear this any time I get something.] 1548 */ 1549 int overall_error_count; 1550 1551 /* The cookie life I award for any cookie. */ 1552 ktime_t cookie_life; 1553 1554 /* These are the association's initial, max, and min RTO values. 1555 * These values will be initialized by system defaults, but can 1556 * be modified via the SCTP_RTOINFO socket option. 1557 */ 1558 unsigned long rto_initial; 1559 unsigned long rto_max; 1560 unsigned long rto_min; 1561 1562 /* Maximum number of new data packets that can be sent in a burst. */ 1563 int max_burst; 1564 1565 /* This is the max_retrans value for the association. This value will 1566 * be initialized initialized from system defaults, but can be 1567 * modified by the SCTP_ASSOCINFO socket option. 1568 */ 1569 int max_retrans; 1570 1571 /* This is the partially failed retrans value for the transport 1572 * and will be initialized from the assocs value. This can be 1573 * changed using the SCTP_PEER_ADDR_THLDS socket option 1574 */ 1575 int pf_retrans; 1576 1577 /* Maximum number of times the endpoint will retransmit INIT */ 1578 __u16 max_init_attempts; 1579 1580 /* How many times have we resent an INIT? */ 1581 __u16 init_retries; 1582 1583 /* The largest timeout or RTO value to use in attempting an INIT */ 1584 unsigned long max_init_timeo; 1585 1586 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1587 * the destination address every heartbeat interval. This value 1588 * will be inherited by all new transports. 1589 */ 1590 unsigned long hbinterval; 1591 1592 /* This is the max_retrans value for new transports in the 1593 * association. 1594 */ 1595 __u16 pathmaxrxt; 1596 1597 /* Flag that path mtu update is pending */ 1598 __u8 pmtu_pending; 1599 1600 /* Association : The smallest PMTU discovered for all of the 1601 * PMTU : peer's transport addresses. 1602 */ 1603 __u32 pathmtu; 1604 1605 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1606 __u32 param_flags; 1607 1608 __u32 sackfreq; 1609 /* SACK delay timeout */ 1610 unsigned long sackdelay; 1611 1612 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1613 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1614 1615 /* Transport to which SHUTDOWN chunk was last sent. */ 1616 struct sctp_transport *shutdown_last_sent_to; 1617 1618 /* Transport to which INIT chunk was last sent. */ 1619 struct sctp_transport *init_last_sent_to; 1620 1621 /* How many times have we resent a SHUTDOWN */ 1622 int shutdown_retries; 1623 1624 /* Next TSN : The next TSN number to be assigned to a new 1625 * : DATA chunk. This is sent in the INIT or INIT 1626 * : ACK chunk to the peer and incremented each 1627 * : time a DATA chunk is assigned a TSN 1628 * : (normally just prior to transmit or during 1629 * : fragmentation). 1630 */ 1631 __u32 next_tsn; 1632 1633 /* 1634 * Last Rcvd : This is the last TSN received in sequence. This value 1635 * TSN : is set initially by taking the peer's Initial TSN, 1636 * : received in the INIT or INIT ACK chunk, and 1637 * : subtracting one from it. 1638 * 1639 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1640 */ 1641 1642 __u32 ctsn_ack_point; 1643 1644 /* PR-SCTP Advanced.Peer.Ack.Point */ 1645 __u32 adv_peer_ack_point; 1646 1647 /* Highest TSN that is acknowledged by incoming SACKs. */ 1648 __u32 highest_sacked; 1649 1650 /* TSN marking the fast recovery exit point */ 1651 __u32 fast_recovery_exit; 1652 1653 /* Flag to track the current fast recovery state */ 1654 __u8 fast_recovery; 1655 1656 /* The number of unacknowledged data chunks. Reported through 1657 * the SCTP_STATUS sockopt. 1658 */ 1659 __u16 unack_data; 1660 1661 /* The total number of data chunks that we've had to retransmit 1662 * as the result of a T3 timer expiration 1663 */ 1664 __u32 rtx_data_chunks; 1665 1666 /* This is the association's receive buffer space. This value is used 1667 * to set a_rwnd field in an INIT or a SACK chunk. 1668 */ 1669 __u32 rwnd; 1670 1671 /* This is the last advertised value of rwnd over a SACK chunk. */ 1672 __u32 a_rwnd; 1673 1674 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1675 * to slop over a maximum of the association's frag_point. 1676 */ 1677 __u32 rwnd_over; 1678 1679 /* Keeps treack of rwnd pressure. This happens when we have 1680 * a window, but not recevie buffer (i.e small packets). This one 1681 * is releases slowly (1 PMTU at a time ). 1682 */ 1683 __u32 rwnd_press; 1684 1685 /* This is the sndbuf size in use for the association. 1686 * This corresponds to the sndbuf size for the association, 1687 * as specified in the sk->sndbuf. 1688 */ 1689 int sndbuf_used; 1690 1691 /* This is the amount of memory that this association has allocated 1692 * in the receive path at any given time. 1693 */ 1694 atomic_t rmem_alloc; 1695 1696 /* This is the wait queue head for send requests waiting on 1697 * the association sndbuf space. 1698 */ 1699 wait_queue_head_t wait; 1700 1701 /* The message size at which SCTP fragmentation will occur. */ 1702 __u32 frag_point; 1703 __u32 user_frag; 1704 1705 /* Counter used to count INIT errors. */ 1706 int init_err_counter; 1707 1708 /* Count the number of INIT cycles (for doubling timeout). */ 1709 int init_cycle; 1710 1711 /* Default send parameters. */ 1712 __u16 default_stream; 1713 __u16 default_flags; 1714 __u32 default_ppid; 1715 __u32 default_context; 1716 __u32 default_timetolive; 1717 1718 /* Default receive parameters */ 1719 __u32 default_rcv_context; 1720 1721 /* This tracks outbound ssn for a given stream. */ 1722 struct sctp_ssnmap *ssnmap; 1723 1724 /* All outbound chunks go through this structure. */ 1725 struct sctp_outq outqueue; 1726 1727 /* A smart pipe that will handle reordering and fragmentation, 1728 * as well as handle passing events up to the ULP. 1729 */ 1730 struct sctp_ulpq ulpq; 1731 1732 /* Last TSN that caused an ECNE Chunk to be sent. */ 1733 __u32 last_ecne_tsn; 1734 1735 /* Last TSN that caused a CWR Chunk to be sent. */ 1736 __u32 last_cwr_tsn; 1737 1738 /* How many duplicated TSNs have we seen? */ 1739 int numduptsns; 1740 1741 /* These are to support 1742 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1743 * and Enforcement of Flow and Message Limits" 1744 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1745 * or "ADDIP" for short. 1746 */ 1747 1748 1749 1750 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1751 * 1752 * R1) One and only one ASCONF Chunk MAY be in transit and 1753 * unacknowledged at any one time. If a sender, after sending 1754 * an ASCONF chunk, decides it needs to transfer another 1755 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1756 * returns from the previous ASCONF Chunk before sending a 1757 * subsequent ASCONF. Note this restriction binds each side, 1758 * so at any time two ASCONF may be in-transit on any given 1759 * association (one sent from each endpoint). 1760 * 1761 * [This is our one-and-only-one ASCONF in flight. If we do 1762 * not have an ASCONF in flight, this is NULL.] 1763 */ 1764 struct sctp_chunk *addip_last_asconf; 1765 1766 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1767 * 1768 * This is needed to implement itmes E1 - E4 of the updated 1769 * spec. Here is the justification: 1770 * 1771 * Since the peer may bundle multiple ASCONF chunks toward us, 1772 * we now need the ability to cache multiple ACKs. The section 1773 * describes in detail how they are cached and cleaned up. 1774 */ 1775 struct list_head asconf_ack_list; 1776 1777 /* These ASCONF chunks are waiting to be sent. 1778 * 1779 * These chunaks can't be pushed to outqueue until receiving 1780 * ASCONF_ACK for the previous ASCONF indicated by 1781 * addip_last_asconf, so as to guarantee that only one ASCONF 1782 * is in flight at any time. 1783 * 1784 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1785 * 1786 * In defining the ASCONF Chunk transfer procedures, it is 1787 * essential that these transfers MUST NOT cause congestion 1788 * within the network. To achieve this, we place these 1789 * restrictions on the transfer of ASCONF Chunks: 1790 * 1791 * R1) One and only one ASCONF Chunk MAY be in transit and 1792 * unacknowledged at any one time. If a sender, after sending 1793 * an ASCONF chunk, decides it needs to transfer another 1794 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1795 * returns from the previous ASCONF Chunk before sending a 1796 * subsequent ASCONF. Note this restriction binds each side, 1797 * so at any time two ASCONF may be in-transit on any given 1798 * association (one sent from each endpoint). 1799 * 1800 * 1801 * [I really think this is EXACTLY the sort of intelligence 1802 * which already resides in sctp_outq. Please move this 1803 * queue and its supporting logic down there. --piggy] 1804 */ 1805 struct list_head addip_chunk_list; 1806 1807 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1808 * 1809 * A2) A serial number should be assigned to the Chunk. The 1810 * serial number SHOULD be a monotonically increasing 1811 * number. The serial number SHOULD be initialized at 1812 * the start of the association to the same value as the 1813 * Initial TSN and every time a new ASCONF chunk is created 1814 * it is incremented by one after assigning the serial number 1815 * to the newly created chunk. 1816 * 1817 * ADDIP 1818 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1819 * 1820 * Serial Number : 32 bits (unsigned integer) 1821 * 1822 * This value represents a Serial Number for the ASCONF 1823 * Chunk. The valid range of Serial Number is from 0 to 1824 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1825 * after reaching 4294967295. 1826 */ 1827 __u32 addip_serial; 1828 int src_out_of_asoc_ok; 1829 union sctp_addr *asconf_addr_del_pending; 1830 struct sctp_transport *new_transport; 1831 1832 /* SCTP AUTH: list of the endpoint shared keys. These 1833 * keys are provided out of band by the user applicaton 1834 * and can't change during the lifetime of the association 1835 */ 1836 struct list_head endpoint_shared_keys; 1837 1838 /* SCTP AUTH: 1839 * The current generated assocaition shared key (secret) 1840 */ 1841 struct sctp_auth_bytes *asoc_shared_key; 1842 1843 /* SCTP AUTH: hmac id of the first peer requested algorithm 1844 * that we support. 1845 */ 1846 __u16 default_hmac_id; 1847 1848 __u16 active_key_id; 1849 1850 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1851 temp:1; /* Is it a temporary association? */ 1852 1853 struct sctp_priv_assoc_stats stats; 1854 }; 1855 1856 1857 /* An eyecatcher for determining if we are really looking at an 1858 * association data structure. 1859 */ 1860 enum { 1861 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1862 }; 1863 1864 /* Recover the outter association structure. */ 1865 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1866 { 1867 struct sctp_association *asoc; 1868 1869 asoc = container_of(base, struct sctp_association, base); 1870 return asoc; 1871 } 1872 1873 /* These are function signatures for manipulating associations. */ 1874 1875 1876 struct sctp_association * 1877 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1878 sctp_scope_t scope, gfp_t gfp); 1879 void sctp_association_free(struct sctp_association *); 1880 void sctp_association_put(struct sctp_association *); 1881 void sctp_association_hold(struct sctp_association *); 1882 1883 struct sctp_transport *sctp_assoc_choose_alter_transport( 1884 struct sctp_association *, struct sctp_transport *); 1885 void sctp_assoc_update_retran_path(struct sctp_association *); 1886 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1887 const union sctp_addr *); 1888 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1889 const union sctp_addr *laddr); 1890 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1891 const union sctp_addr *address, 1892 const gfp_t gfp, 1893 const int peer_state); 1894 void sctp_assoc_del_peer(struct sctp_association *asoc, 1895 const union sctp_addr *addr); 1896 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1897 struct sctp_transport *peer); 1898 void sctp_assoc_control_transport(struct sctp_association *, 1899 struct sctp_transport *, 1900 sctp_transport_cmd_t, sctp_sn_error_t); 1901 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1902 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1903 struct net *, 1904 const union sctp_addr *, 1905 const union sctp_addr *); 1906 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1907 void sctp_assoc_update(struct sctp_association *old, 1908 struct sctp_association *new); 1909 1910 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1911 1912 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *); 1913 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1914 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1915 void sctp_assoc_set_primary(struct sctp_association *, 1916 struct sctp_transport *); 1917 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1918 struct sctp_transport *); 1919 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1920 sctp_scope_t, gfp_t); 1921 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1922 struct sctp_cookie*, 1923 gfp_t gfp); 1924 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1925 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1926 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1927 const struct sctp_association *asoc, 1928 __be32 serial); 1929 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1930 1931 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1932 const union sctp_addr *ss2); 1933 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1934 1935 /* A convenience structure to parse out SCTP specific CMSGs. */ 1936 typedef struct sctp_cmsgs { 1937 struct sctp_initmsg *init; 1938 struct sctp_sndrcvinfo *srinfo; 1939 struct sctp_sndinfo *sinfo; 1940 } sctp_cmsgs_t; 1941 1942 /* Structure for tracking memory objects */ 1943 typedef struct { 1944 char *label; 1945 atomic_t *counter; 1946 } sctp_dbg_objcnt_entry_t; 1947 1948 #endif /* __sctp_structs_h__ */ 1949