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 #include <net/ip.h> /* For inet_skb_parm */ 63 64 /* A convenience structure for handling sockaddr structures. 65 * We should wean ourselves off this. 66 */ 67 union sctp_addr { 68 struct sockaddr_in v4; 69 struct sockaddr_in6 v6; 70 struct sockaddr sa; 71 }; 72 73 /* Forward declarations for data structures. */ 74 struct sctp_globals; 75 struct sctp_endpoint; 76 struct sctp_association; 77 struct sctp_transport; 78 struct sctp_packet; 79 struct sctp_chunk; 80 struct sctp_inq; 81 struct sctp_outq; 82 struct sctp_bind_addr; 83 struct sctp_ulpq; 84 struct sctp_ep_common; 85 struct crypto_shash; 86 struct sctp_stream; 87 88 89 #include <net/sctp/tsnmap.h> 90 #include <net/sctp/ulpevent.h> 91 #include <net/sctp/ulpqueue.h> 92 93 /* Structures useful for managing bind/connect. */ 94 95 struct sctp_bind_bucket { 96 unsigned short port; 97 unsigned short fastreuse; 98 struct hlist_node node; 99 struct hlist_head owner; 100 struct net *net; 101 }; 102 103 struct sctp_bind_hashbucket { 104 spinlock_t lock; 105 struct hlist_head chain; 106 }; 107 108 /* Used for hashing all associations. */ 109 struct sctp_hashbucket { 110 rwlock_t lock; 111 struct hlist_head chain; 112 } __attribute__((__aligned__(8))); 113 114 115 /* The SCTP globals structure. */ 116 extern struct sctp_globals { 117 /* This is a list of groups of functions for each address 118 * family that we support. 119 */ 120 struct list_head address_families; 121 122 /* This is the hash of all endpoints. */ 123 struct sctp_hashbucket *ep_hashtable; 124 /* This is the sctp port control hash. */ 125 struct sctp_bind_hashbucket *port_hashtable; 126 /* This is the hash of all transports. */ 127 struct rhltable transport_hashtable; 128 129 /* Sizes of above hashtables. */ 130 int ep_hashsize; 131 int port_hashsize; 132 133 /* Default initialization values to be applied to new associations. */ 134 __u16 max_instreams; 135 __u16 max_outstreams; 136 137 /* Flag to indicate whether computing and verifying checksum 138 * is disabled. */ 139 bool checksum_disable; 140 } sctp_globals; 141 142 #define sctp_max_instreams (sctp_globals.max_instreams) 143 #define sctp_max_outstreams (sctp_globals.max_outstreams) 144 #define sctp_address_families (sctp_globals.address_families) 145 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 146 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 147 #define sctp_port_hashsize (sctp_globals.port_hashsize) 148 #define sctp_port_hashtable (sctp_globals.port_hashtable) 149 #define sctp_transport_hashtable (sctp_globals.transport_hashtable) 150 #define sctp_checksum_disable (sctp_globals.checksum_disable) 151 152 /* SCTP Socket type: UDP or TCP style. */ 153 typedef enum { 154 SCTP_SOCKET_UDP = 0, 155 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 156 SCTP_SOCKET_TCP 157 } sctp_socket_type_t; 158 159 /* Per socket SCTP information. */ 160 struct sctp_sock { 161 /* inet_sock has to be the first member of sctp_sock */ 162 struct inet_sock inet; 163 /* What kind of a socket is this? */ 164 sctp_socket_type_t type; 165 166 /* PF_ family specific functions. */ 167 struct sctp_pf *pf; 168 169 /* Access to HMAC transform. */ 170 struct crypto_shash *hmac; 171 char *sctp_hmac_alg; 172 173 /* What is our base endpointer? */ 174 struct sctp_endpoint *ep; 175 176 struct sctp_bind_bucket *bind_hash; 177 /* Various Socket Options. */ 178 __u16 default_stream; 179 __u32 default_ppid; 180 __u16 default_flags; 181 __u32 default_context; 182 __u32 default_timetolive; 183 __u32 default_rcv_context; 184 int max_burst; 185 186 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 187 * the destination address every heartbeat interval. This value 188 * will be inherited by all new associations. 189 */ 190 __u32 hbinterval; 191 192 /* This is the max_retrans value for new associations. */ 193 __u16 pathmaxrxt; 194 195 /* The initial Path MTU to use for new associations. */ 196 __u32 pathmtu; 197 198 /* The default SACK delay timeout for new associations. */ 199 __u32 sackdelay; 200 __u32 sackfreq; 201 202 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 203 __u32 param_flags; 204 205 struct sctp_initmsg initmsg; 206 struct sctp_rtoinfo rtoinfo; 207 struct sctp_paddrparams paddrparam; 208 struct sctp_event_subscribe subscribe; 209 struct sctp_assocparams assocparams; 210 211 int user_frag; 212 213 __u32 autoclose; 214 __u32 adaptation_ind; 215 __u32 pd_point; 216 __u16 nodelay:1, 217 disable_fragments:1, 218 v4mapped:1, 219 frag_interleave:1, 220 recvrcvinfo:1, 221 recvnxtinfo:1, 222 data_ready_signalled:1; 223 224 atomic_t pd_mode; 225 /* Receive to here while partial delivery is in effect. */ 226 struct sk_buff_head pd_lobby; 227 228 /* These must be the last fields, as they will skipped on copies, 229 * like on accept and peeloff operations 230 */ 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 ktime_t 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 } sctp_sender_hb_info_t; 379 380 int sctp_stream_new(struct sctp_association *asoc, gfp_t gfp); 381 int sctp_stream_init(struct sctp_association *asoc, gfp_t gfp); 382 void sctp_stream_free(struct sctp_stream *stream); 383 void sctp_stream_clear(struct sctp_stream *stream); 384 385 /* What is the current SSN number for this stream? */ 386 #define sctp_ssn_peek(stream, type, sid) \ 387 ((stream)->type[sid].ssn) 388 389 /* Return the next SSN number for this stream. */ 390 #define sctp_ssn_next(stream, type, sid) \ 391 ((stream)->type[sid].ssn++) 392 393 /* Skip over this ssn and all below. */ 394 #define sctp_ssn_skip(stream, type, sid, ssn) \ 395 ((stream)->type[sid].ssn = ssn + 1) 396 397 /* 398 * Pointers to address related SCTP functions. 399 * (i.e. things that depend on the address family.) 400 */ 401 struct sctp_af { 402 int (*sctp_xmit) (struct sk_buff *skb, 403 struct sctp_transport *); 404 int (*setsockopt) (struct sock *sk, 405 int level, 406 int optname, 407 char __user *optval, 408 unsigned int optlen); 409 int (*getsockopt) (struct sock *sk, 410 int level, 411 int optname, 412 char __user *optval, 413 int __user *optlen); 414 int (*compat_setsockopt) (struct sock *sk, 415 int level, 416 int optname, 417 char __user *optval, 418 unsigned int optlen); 419 int (*compat_getsockopt) (struct sock *sk, 420 int level, 421 int optname, 422 char __user *optval, 423 int __user *optlen); 424 void (*get_dst) (struct sctp_transport *t, 425 union sctp_addr *saddr, 426 struct flowi *fl, 427 struct sock *sk); 428 void (*get_saddr) (struct sctp_sock *sk, 429 struct sctp_transport *t, 430 struct flowi *fl); 431 void (*copy_addrlist) (struct list_head *, 432 struct net_device *); 433 int (*cmp_addr) (const union sctp_addr *addr1, 434 const union sctp_addr *addr2); 435 void (*addr_copy) (union sctp_addr *dst, 436 union sctp_addr *src); 437 void (*from_skb) (union sctp_addr *, 438 struct sk_buff *skb, 439 int saddr); 440 void (*from_sk) (union sctp_addr *, 441 struct sock *sk); 442 void (*from_addr_param) (union sctp_addr *, 443 union sctp_addr_param *, 444 __be16 port, int iif); 445 int (*to_addr_param) (const union sctp_addr *, 446 union sctp_addr_param *); 447 int (*addr_valid) (union sctp_addr *, 448 struct sctp_sock *, 449 const struct sk_buff *); 450 sctp_scope_t (*scope) (union sctp_addr *); 451 void (*inaddr_any) (union sctp_addr *, __be16); 452 int (*is_any) (const union sctp_addr *); 453 int (*available) (union sctp_addr *, 454 struct sctp_sock *); 455 int (*skb_iif) (const struct sk_buff *sk); 456 int (*is_ce) (const struct sk_buff *sk); 457 void (*seq_dump_addr)(struct seq_file *seq, 458 union sctp_addr *addr); 459 void (*ecn_capable)(struct sock *sk); 460 __u16 net_header_len; 461 int sockaddr_len; 462 sa_family_t sa_family; 463 struct list_head list; 464 }; 465 466 struct sctp_af *sctp_get_af_specific(sa_family_t); 467 int sctp_register_af(struct sctp_af *); 468 469 /* Protocol family functions. */ 470 struct sctp_pf { 471 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 472 void (*skb_msgname) (struct sk_buff *, char *, int *); 473 int (*af_supported) (sa_family_t, struct sctp_sock *); 474 int (*cmp_addr) (const union sctp_addr *, 475 const union sctp_addr *, 476 struct sctp_sock *); 477 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 478 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 479 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 480 struct sock *(*create_accept_sk) (struct sock *sk, 481 struct sctp_association *asoc, 482 bool kern); 483 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 484 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 485 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 486 struct sctp_af *af; 487 }; 488 489 490 /* Structure to track chunk fragments that have been acked, but peer 491 * fragments of the same message have not. 492 */ 493 struct sctp_datamsg { 494 /* Chunks waiting to be submitted to lower layer. */ 495 struct list_head chunks; 496 /* Reference counting. */ 497 atomic_t refcnt; 498 /* When is this message no longer interesting to the peer? */ 499 unsigned long expires_at; 500 /* Did the messenge fail to send? */ 501 int send_error; 502 u8 send_failed:1, 503 can_delay; /* should this message be Nagle delayed */ 504 }; 505 506 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 507 struct sctp_sndrcvinfo *, 508 struct iov_iter *); 509 void sctp_datamsg_free(struct sctp_datamsg *); 510 void sctp_datamsg_put(struct sctp_datamsg *); 511 void sctp_chunk_fail(struct sctp_chunk *, int error); 512 int sctp_chunk_abandoned(struct sctp_chunk *); 513 514 /* RFC2960 1.4 Key Terms 515 * 516 * o Chunk: A unit of information within an SCTP packet, consisting of 517 * a chunk header and chunk-specific content. 518 * 519 * As a matter of convenience, we remember the SCTP common header for 520 * each chunk as well as a few other header pointers... 521 */ 522 struct sctp_chunk { 523 struct list_head list; 524 525 atomic_t refcnt; 526 527 /* How many times this chunk have been sent, for prsctp RTX policy */ 528 int sent_count; 529 530 /* This is our link to the per-transport transmitted list. */ 531 struct list_head transmitted_list; 532 533 /* This field is used by chunks that hold fragmented data. 534 * For the first fragment this is the list that holds the rest of 535 * fragments. For the remaining fragments, this is the link to the 536 * frag_list maintained in the first fragment. 537 */ 538 struct list_head frag_list; 539 540 /* This points to the sk_buff containing the actual data. */ 541 struct sk_buff *skb; 542 543 /* In case of GSO packets, this will store the head one */ 544 struct sk_buff *head_skb; 545 546 /* These are the SCTP headers by reverse order in a packet. 547 * Note that some of these may happen more than once. In that 548 * case, we point at the "current" one, whatever that means 549 * for that level of header. 550 */ 551 552 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 553 union sctp_params param_hdr; 554 union { 555 __u8 *v; 556 struct sctp_datahdr *data_hdr; 557 struct sctp_inithdr *init_hdr; 558 struct sctp_sackhdr *sack_hdr; 559 struct sctp_heartbeathdr *hb_hdr; 560 struct sctp_sender_hb_info *hbs_hdr; 561 struct sctp_shutdownhdr *shutdown_hdr; 562 struct sctp_signed_cookie *cookie_hdr; 563 struct sctp_ecnehdr *ecne_hdr; 564 struct sctp_cwrhdr *ecn_cwr_hdr; 565 struct sctp_errhdr *err_hdr; 566 struct sctp_addiphdr *addip_hdr; 567 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 568 struct sctp_authhdr *auth_hdr; 569 } subh; 570 571 __u8 *chunk_end; 572 573 struct sctp_chunkhdr *chunk_hdr; 574 struct sctphdr *sctp_hdr; 575 576 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 577 struct sctp_sndrcvinfo sinfo; 578 579 /* Which association does this belong to? */ 580 struct sctp_association *asoc; 581 582 /* What endpoint received this chunk? */ 583 struct sctp_ep_common *rcvr; 584 585 /* We fill this in if we are calculating RTT. */ 586 unsigned long sent_at; 587 588 /* What is the origin IP address for this chunk? */ 589 union sctp_addr source; 590 /* Destination address for this chunk. */ 591 union sctp_addr dest; 592 593 /* For outbound message, track all fragments for SEND_FAILED. */ 594 struct sctp_datamsg *msg; 595 596 /* For an inbound chunk, this tells us where it came from. 597 * For an outbound chunk, it tells us where we'd like it to 598 * go. It is NULL if we have no preference. 599 */ 600 struct sctp_transport *transport; 601 602 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 603 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 604 * spec violates the principle premis that all chunks are processed 605 * in order. 606 */ 607 struct sk_buff *auth_chunk; 608 609 #define SCTP_CAN_FRTX 0x0 610 #define SCTP_NEED_FRTX 0x1 611 #define SCTP_DONT_FRTX 0x2 612 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 613 has_tsn:1, /* Does this chunk have a TSN yet? */ 614 has_ssn:1, /* Does this chunk have a SSN yet? */ 615 singleton:1, /* Only chunk in the packet? */ 616 end_of_packet:1, /* Last chunk in the packet? */ 617 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 618 pdiscard:1, /* Discard the whole packet now? */ 619 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 620 data_accepted:1, /* At least 1 chunk accepted */ 621 auth:1, /* IN: was auth'ed | OUT: needs auth */ 622 has_asconf:1, /* IN: have seen an asconf before */ 623 tsn_missing_report:2, /* Data chunk missing counter. */ 624 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 625 }; 626 627 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 628 void sctp_chunk_hold(struct sctp_chunk *); 629 void sctp_chunk_put(struct sctp_chunk *); 630 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 631 struct iov_iter *from); 632 void sctp_chunk_free(struct sctp_chunk *); 633 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 634 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 635 const struct sctp_association *, 636 struct sock *, gfp_t gfp); 637 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 638 union sctp_addr *); 639 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 640 641 enum { 642 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 643 SCTP_ADDR_SRC, /* address can be used as source */ 644 SCTP_ADDR_DEL, /* address about to be deleted */ 645 }; 646 647 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 648 struct sctp_sockaddr_entry { 649 struct list_head list; 650 struct rcu_head rcu; 651 union sctp_addr a; 652 __u8 state; 653 __u8 valid; 654 }; 655 656 #define SCTP_ADDRESS_TICK_DELAY 500 657 658 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 659 660 /* This structure holds lists of chunks as we are assembling for 661 * transmission. 662 */ 663 struct sctp_packet { 664 /* These are the SCTP header values (host order) for the packet. */ 665 __u16 source_port; 666 __u16 destination_port; 667 __u32 vtag; 668 669 /* This contains the payload chunks. */ 670 struct list_head chunk_list; 671 672 /* This is the overhead of the sctp and ip headers. */ 673 size_t overhead; 674 /* This is the total size of all chunks INCLUDING padding. */ 675 size_t size; 676 /* This is the maximum size this packet may have */ 677 size_t max_size; 678 679 /* The packet is destined for this transport address. 680 * The function we finally use to pass down to the next lower 681 * layer lives in the transport structure. 682 */ 683 struct sctp_transport *transport; 684 685 /* pointer to the auth chunk for this packet */ 686 struct sctp_chunk *auth; 687 688 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 689 has_sack:1, /* This packet contains a SACK chunk. */ 690 has_auth:1, /* This packet contains an AUTH chunk */ 691 has_data:1, /* This packet contains at least 1 DATA chunk */ 692 ipfragok:1; /* So let ip fragment this packet */ 693 }; 694 695 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 696 __u16 sport, __u16 dport); 697 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 698 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 699 struct sctp_chunk *, int, gfp_t); 700 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 701 struct sctp_chunk *); 702 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 703 void sctp_packet_free(struct sctp_packet *); 704 705 static inline int sctp_packet_empty(struct sctp_packet *packet) 706 { 707 return packet->size == packet->overhead; 708 } 709 710 /* This represents a remote transport address. 711 * For local transport addresses, we just use union sctp_addr. 712 * 713 * RFC2960 Section 1.4 Key Terms 714 * 715 * o Transport address: A Transport Address is traditionally defined 716 * by Network Layer address, Transport Layer protocol and Transport 717 * Layer port number. In the case of SCTP running over IP, a 718 * transport address is defined by the combination of an IP address 719 * and an SCTP port number (where SCTP is the Transport protocol). 720 * 721 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 722 * 723 * o The sender keeps a separate congestion control parameter set for 724 * each of the destination addresses it can send to (not each 725 * source-destination pair but for each destination). The parameters 726 * should decay if the address is not used for a long enough time 727 * period. 728 * 729 */ 730 struct sctp_transport { 731 /* A list of transports. */ 732 struct list_head transports; 733 struct rhlist_head node; 734 735 /* Reference counting. */ 736 atomic_t refcnt; 737 /* RTO-Pending : A flag used to track if one of the DATA 738 * chunks sent to this address is currently being 739 * used to compute a RTT. If this flag is 0, 740 * the next DATA chunk sent to this destination 741 * should be used to compute a RTT and this flag 742 * should be set. Every time the RTT 743 * calculation completes (i.e. the DATA chunk 744 * is SACK'd) clear this flag. 745 */ 746 __u32 rto_pending:1, 747 748 /* 749 * hb_sent : a flag that signals that we have a pending 750 * heartbeat. 751 */ 752 hb_sent:1, 753 754 /* Is the Path MTU update pending on this tranport */ 755 pmtu_pending:1, 756 757 dst_pending_confirm:1, /* need to confirm neighbour */ 758 759 /* Has this transport moved the ctsn since we last sacked */ 760 sack_generation:1; 761 u32 dst_cookie; 762 763 struct flowi fl; 764 765 /* This is the peer's IP address and port. */ 766 union sctp_addr ipaddr; 767 768 /* These are the functions we call to handle LLP stuff. */ 769 struct sctp_af *af_specific; 770 771 /* Which association do we belong to? */ 772 struct sctp_association *asoc; 773 774 /* RFC2960 775 * 776 * 12.3 Per Transport Address Data 777 * 778 * For each destination transport address in the peer's 779 * address list derived from the INIT or INIT ACK chunk, a 780 * number of data elements needs to be maintained including: 781 */ 782 /* RTO : The current retransmission timeout value. */ 783 unsigned long rto; 784 785 __u32 rtt; /* This is the most recent RTT. */ 786 787 /* RTTVAR : The current RTT variation. */ 788 __u32 rttvar; 789 790 /* SRTT : The current smoothed round trip time. */ 791 __u32 srtt; 792 793 /* 794 * These are the congestion stats. 795 */ 796 /* cwnd : The current congestion window. */ 797 __u32 cwnd; /* This is the actual cwnd. */ 798 799 /* ssthresh : The current slow start threshold value. */ 800 __u32 ssthresh; 801 802 /* partial : The tracking method for increase of cwnd when in 803 * bytes acked : congestion avoidance mode (see Section 6.2.2) 804 */ 805 __u32 partial_bytes_acked; 806 807 /* Data that has been sent, but not acknowledged. */ 808 __u32 flight_size; 809 810 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 811 812 /* Destination */ 813 struct dst_entry *dst; 814 /* Source address. */ 815 union sctp_addr saddr; 816 817 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 818 * the destination address every heartbeat interval. 819 */ 820 unsigned long hbinterval; 821 822 /* SACK delay timeout */ 823 unsigned long sackdelay; 824 __u32 sackfreq; 825 826 /* When was the last time that we heard from this transport? We use 827 * this to pick new active and retran paths. 828 */ 829 ktime_t last_time_heard; 830 831 /* When was the last time that we sent a chunk using this 832 * transport? We use this to check for idle transports 833 */ 834 unsigned long last_time_sent; 835 836 /* Last time(in jiffies) when cwnd is reduced due to the congestion 837 * indication based on ECNE chunk. 838 */ 839 unsigned long last_time_ecne_reduced; 840 841 /* This is the max_retrans value for the transport and will 842 * be initialized from the assocs value. This can be changed 843 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 844 */ 845 __u16 pathmaxrxt; 846 847 /* This is the partially failed retrans value for the transport 848 * and will be initialized from the assocs value. This can be changed 849 * using the SCTP_PEER_ADDR_THLDS socket option 850 */ 851 int pf_retrans; 852 /* PMTU : The current known path MTU. */ 853 __u32 pathmtu; 854 855 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 856 __u32 param_flags; 857 858 /* The number of times INIT has been sent on this transport. */ 859 int init_sent_count; 860 861 /* state : The current state of this destination, 862 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 863 */ 864 int state; 865 866 /* These are the error stats for this destination. */ 867 868 /* Error count : The current error count for this destination. */ 869 unsigned short error_count; 870 871 /* Per : A timer used by each destination. 872 * Destination : 873 * Timer : 874 * 875 * [Everywhere else in the text this is called T3-rtx. -ed] 876 */ 877 struct timer_list T3_rtx_timer; 878 879 /* Heartbeat timer is per destination. */ 880 struct timer_list hb_timer; 881 882 /* Timer to handle ICMP proto unreachable envets */ 883 struct timer_list proto_unreach_timer; 884 885 /* Timer to handler reconf chunk rtx */ 886 struct timer_list reconf_timer; 887 888 /* Since we're using per-destination retransmission timers 889 * (see above), we're also using per-destination "transmitted" 890 * queues. This probably ought to be a private struct 891 * accessible only within the outqueue, but it's not, yet. 892 */ 893 struct list_head transmitted; 894 895 /* We build bundle-able packets for this transport here. */ 896 struct sctp_packet packet; 897 898 /* This is the list of transports that have chunks to send. */ 899 struct list_head send_ready; 900 901 /* State information saved for SFR_CACC algorithm. The key 902 * idea in SFR_CACC is to maintain state at the sender on a 903 * per-destination basis when a changeover happens. 904 * char changeover_active; 905 * char cycling_changeover; 906 * __u32 next_tsn_at_change; 907 * char cacc_saw_newack; 908 */ 909 struct { 910 /* An unsigned integer, which stores the next TSN to be 911 * used by the sender, at the moment of changeover. 912 */ 913 __u32 next_tsn_at_change; 914 915 /* A flag which indicates the occurrence of a changeover */ 916 char changeover_active; 917 918 /* A flag which indicates whether the change of primary is 919 * the first switch to this destination address during an 920 * active switch. 921 */ 922 char cycling_changeover; 923 924 /* A temporary flag, which is used during the processing of 925 * a SACK to estimate the causative TSN(s)'s group. 926 */ 927 char cacc_saw_newack; 928 } cacc; 929 930 /* 64-bit random number sent with heartbeat. */ 931 __u64 hb_nonce; 932 933 struct rcu_head rcu; 934 }; 935 936 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 937 gfp_t); 938 void sctp_transport_set_owner(struct sctp_transport *, 939 struct sctp_association *); 940 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 941 struct sctp_sock *); 942 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 943 void sctp_transport_free(struct sctp_transport *); 944 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 945 void sctp_transport_reset_hb_timer(struct sctp_transport *); 946 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 947 int sctp_transport_hold(struct sctp_transport *); 948 void sctp_transport_put(struct sctp_transport *); 949 void sctp_transport_update_rto(struct sctp_transport *, __u32); 950 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 951 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 952 void sctp_transport_burst_limited(struct sctp_transport *); 953 void sctp_transport_burst_reset(struct sctp_transport *); 954 unsigned long sctp_transport_timeout(struct sctp_transport *); 955 void sctp_transport_reset(struct sctp_transport *t); 956 void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); 957 void sctp_transport_immediate_rtx(struct sctp_transport *); 958 void sctp_transport_dst_release(struct sctp_transport *t); 959 void sctp_transport_dst_confirm(struct sctp_transport *t); 960 961 962 /* This is the structure we use to queue packets as they come into 963 * SCTP. We write packets to it and read chunks from it. 964 */ 965 struct sctp_inq { 966 /* This is actually a queue of sctp_chunk each 967 * containing a partially decoded packet. 968 */ 969 struct list_head in_chunk_list; 970 /* This is the packet which is currently off the in queue and is 971 * being worked on through the inbound chunk processing. 972 */ 973 struct sctp_chunk *in_progress; 974 975 /* This is the delayed task to finish delivering inbound 976 * messages. 977 */ 978 struct work_struct immediate; 979 }; 980 981 void sctp_inq_init(struct sctp_inq *); 982 void sctp_inq_free(struct sctp_inq *); 983 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 984 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 985 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 986 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 987 988 /* This is the structure we use to hold outbound chunks. You push 989 * chunks in and they automatically pop out the other end as bundled 990 * packets (it calls (*output_handler)()). 991 * 992 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 993 * and 8.2 of the v13 draft. 994 * 995 * It handles retransmissions. The connection to the timeout portion 996 * of the state machine is through sctp_..._timeout() and timeout_handler. 997 * 998 * If you feed it SACKs, it will eat them. 999 * 1000 * If you give it big chunks, it will fragment them. 1001 * 1002 * It assigns TSN's to data chunks. This happens at the last possible 1003 * instant before transmission. 1004 * 1005 * When free()'d, it empties itself out via output_handler(). 1006 */ 1007 struct sctp_outq { 1008 struct sctp_association *asoc; 1009 1010 /* Data pending that has never been transmitted. */ 1011 struct list_head out_chunk_list; 1012 1013 unsigned int out_qlen; /* Total length of queued data chunks. */ 1014 1015 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1016 unsigned int error; 1017 1018 /* These are control chunks we want to send. */ 1019 struct list_head control_chunk_list; 1020 1021 /* These are chunks that have been sacked but are above the 1022 * CTSN, or cumulative tsn ack point. 1023 */ 1024 struct list_head sacked; 1025 1026 /* Put chunks on this list to schedule them for 1027 * retransmission. 1028 */ 1029 struct list_head retransmit; 1030 1031 /* Put chunks on this list to save them for FWD TSN processing as 1032 * they were abandoned. 1033 */ 1034 struct list_head abandoned; 1035 1036 /* How many unackd bytes do we have in-flight? */ 1037 __u32 outstanding_bytes; 1038 1039 /* Are we doing fast-rtx on this queue */ 1040 char fast_rtx; 1041 1042 /* Corked? */ 1043 char cork; 1044 }; 1045 1046 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1047 void sctp_outq_teardown(struct sctp_outq *); 1048 void sctp_outq_free(struct sctp_outq*); 1049 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1050 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1051 int sctp_outq_is_empty(const struct sctp_outq *); 1052 void sctp_outq_restart(struct sctp_outq *); 1053 1054 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1055 sctp_retransmit_reason_t); 1056 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1057 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1058 void sctp_prsctp_prune(struct sctp_association *asoc, 1059 struct sctp_sndrcvinfo *sinfo, int msg_len); 1060 /* Uncork and flush an outqueue. */ 1061 static inline void sctp_outq_cork(struct sctp_outq *q) 1062 { 1063 q->cork = 1; 1064 } 1065 1066 /* SCTP skb control block. 1067 * sctp_input_cb is currently used on rx and sock rx queue 1068 */ 1069 struct sctp_input_cb { 1070 union { 1071 struct inet_skb_parm h4; 1072 #if IS_ENABLED(CONFIG_IPV6) 1073 struct inet6_skb_parm h6; 1074 #endif 1075 } header; 1076 struct sctp_chunk *chunk; 1077 struct sctp_af *af; 1078 }; 1079 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1080 1081 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1082 { 1083 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1084 1085 return chunk->head_skb ? : skb; 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 1107 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1108 void sctp_bind_addr_free(struct sctp_bind_addr *); 1109 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1110 const struct sctp_bind_addr *src, 1111 sctp_scope_t scope, gfp_t gfp, 1112 int flags); 1113 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1114 const struct sctp_bind_addr *src, 1115 gfp_t gfp); 1116 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1117 int new_size, __u8 addr_state, gfp_t gfp); 1118 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1119 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1120 struct sctp_sock *); 1121 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1122 struct sctp_sock *, struct sctp_sock *); 1123 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1124 const union sctp_addr *addr); 1125 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1126 const union sctp_addr *addrs, 1127 int addrcnt, 1128 struct sctp_sock *opt); 1129 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1130 int *addrs_len, 1131 gfp_t gfp); 1132 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1133 __u16 port, gfp_t gfp); 1134 1135 sctp_scope_t sctp_scope(const union sctp_addr *); 1136 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1137 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1138 int sctp_is_ep_boundall(struct sock *sk); 1139 1140 1141 /* What type of endpoint? */ 1142 typedef enum { 1143 SCTP_EP_TYPE_SOCKET, 1144 SCTP_EP_TYPE_ASSOCIATION, 1145 } sctp_endpoint_type_t; 1146 1147 /* 1148 * A common base class to bridge the implmentation view of a 1149 * socket (usually listening) endpoint versus an association's 1150 * local endpoint. 1151 * This common structure is useful for several purposes: 1152 * 1) Common interface for lookup routines. 1153 * a) Subfunctions work for either endpoint or association 1154 * b) Single interface to lookup allows hiding the lookup lock rather 1155 * than acquiring it externally. 1156 * 2) Common interface for the inbound chunk handling/state machine. 1157 * 3) Common object handling routines for reference counting, etc. 1158 * 4) Disentangle association lookup from endpoint lookup, where we 1159 * do not have to find our endpoint to find our association. 1160 * 1161 */ 1162 1163 struct sctp_ep_common { 1164 /* Fields to help us manage our entries in the hash tables. */ 1165 struct hlist_node node; 1166 int hashent; 1167 1168 /* Runtime type information. What kind of endpoint is this? */ 1169 sctp_endpoint_type_t type; 1170 1171 /* Some fields to help us manage this object. 1172 * refcnt - Reference count access to this object. 1173 * dead - Do not attempt to use this object. 1174 */ 1175 atomic_t refcnt; 1176 bool dead; 1177 1178 /* What socket does this endpoint belong to? */ 1179 struct sock *sk; 1180 1181 /* This is where we receive inbound chunks. */ 1182 struct sctp_inq inqueue; 1183 1184 /* This substructure includes the defining parameters of the 1185 * endpoint: 1186 * bind_addr.port is our shared port number. 1187 * bind_addr.address_list is our set of local IP addresses. 1188 */ 1189 struct sctp_bind_addr bind_addr; 1190 }; 1191 1192 1193 /* RFC Section 1.4 Key Terms 1194 * 1195 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1196 * multi-homed host, an SCTP endpoint is represented to its peers as a 1197 * combination of a set of eligible destination transport addresses to 1198 * which SCTP packets can be sent and a set of eligible source 1199 * transport addresses from which SCTP packets can be received. 1200 * All transport addresses used by an SCTP endpoint must use the 1201 * same port number, but can use multiple IP addresses. A transport 1202 * address used by an SCTP endpoint must not be used by another 1203 * SCTP endpoint. In other words, a transport address is unique 1204 * to an SCTP endpoint. 1205 * 1206 * From an implementation perspective, each socket has one of these. 1207 * A TCP-style socket will have exactly one association on one of 1208 * these. An UDP-style socket will have multiple associations hanging 1209 * off one of these. 1210 */ 1211 1212 struct sctp_endpoint { 1213 /* Common substructure for endpoint and association. */ 1214 struct sctp_ep_common base; 1215 1216 /* Associations: A list of current associations and mappings 1217 * to the data consumers for each association. This 1218 * may be in the form of a hash table or other 1219 * implementation dependent structure. The data 1220 * consumers may be process identification 1221 * information such as file descriptors, named pipe 1222 * pointer, or table pointers dependent on how SCTP 1223 * is implemented. 1224 */ 1225 /* This is really a list of struct sctp_association entries. */ 1226 struct list_head asocs; 1227 1228 /* Secret Key: A secret key used by this endpoint to compute 1229 * the MAC. This SHOULD be a cryptographic quality 1230 * random number with a sufficient length. 1231 * Discussion in [RFC1750] can be helpful in 1232 * selection of the key. 1233 */ 1234 __u8 secret_key[SCTP_SECRET_SIZE]; 1235 1236 /* digest: This is a digest of the sctp cookie. This field is 1237 * only used on the receive path when we try to validate 1238 * that the cookie has not been tampered with. We put 1239 * this here so we pre-allocate this once and can re-use 1240 * on every receive. 1241 */ 1242 __u8 *digest; 1243 1244 /* sendbuf acct. policy. */ 1245 __u32 sndbuf_policy; 1246 1247 /* rcvbuf acct. policy. */ 1248 __u32 rcvbuf_policy; 1249 1250 /* SCTP AUTH: array of the HMACs that will be allocated 1251 * we need this per association so that we don't serialize 1252 */ 1253 struct crypto_shash **auth_hmacs; 1254 1255 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1256 struct sctp_hmac_algo_param *auth_hmacs_list; 1257 1258 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1259 struct sctp_chunks_param *auth_chunk_list; 1260 1261 /* SCTP-AUTH: endpoint shared keys */ 1262 struct list_head endpoint_shared_keys; 1263 __u16 active_key_id; 1264 __u8 auth_enable:1, 1265 prsctp_enable:1, 1266 reconf_enable:1; 1267 1268 __u8 strreset_enable; 1269 }; 1270 1271 /* Recover the outter endpoint structure. */ 1272 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1273 { 1274 struct sctp_endpoint *ep; 1275 1276 ep = container_of(base, struct sctp_endpoint, base); 1277 return ep; 1278 } 1279 1280 /* These are function signatures for manipulating endpoints. */ 1281 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1282 void sctp_endpoint_free(struct sctp_endpoint *); 1283 void sctp_endpoint_put(struct sctp_endpoint *); 1284 void sctp_endpoint_hold(struct sctp_endpoint *); 1285 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1286 struct sctp_association *sctp_endpoint_lookup_assoc( 1287 const struct sctp_endpoint *ep, 1288 const union sctp_addr *paddr, 1289 struct sctp_transport **); 1290 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1291 const union sctp_addr *); 1292 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1293 struct net *, const union sctp_addr *); 1294 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1295 const union sctp_addr *paddr); 1296 1297 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1298 const struct sctp_association *asoc, 1299 sctp_cid_t, sctp_init_chunk_t *peer_init, 1300 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1301 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1302 const union sctp_addr *peer, 1303 sctp_init_chunk_t *init, gfp_t gfp); 1304 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1305 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1306 1307 struct sctp_inithdr_host { 1308 __u32 init_tag; 1309 __u32 a_rwnd; 1310 __u16 num_outbound_streams; 1311 __u16 num_inbound_streams; 1312 __u32 initial_tsn; 1313 }; 1314 1315 struct sctp_stream_out { 1316 __u16 ssn; 1317 __u8 state; 1318 }; 1319 1320 struct sctp_stream_in { 1321 __u16 ssn; 1322 }; 1323 1324 struct sctp_stream { 1325 struct sctp_stream_out *out; 1326 struct sctp_stream_in *in; 1327 __u16 outcnt; 1328 __u16 incnt; 1329 }; 1330 1331 #define SCTP_STREAM_CLOSED 0x00 1332 #define SCTP_STREAM_OPEN 0x01 1333 1334 /* SCTP_GET_ASSOC_STATS counters */ 1335 struct sctp_priv_assoc_stats { 1336 /* Maximum observed rto in the association during subsequent 1337 * observations. Value is set to 0 if no RTO measurement took place 1338 * The transport where the max_rto was observed is returned in 1339 * obs_rto_ipaddr 1340 */ 1341 struct sockaddr_storage obs_rto_ipaddr; 1342 __u64 max_obs_rto; 1343 /* Total In and Out SACKs received and sent */ 1344 __u64 isacks; 1345 __u64 osacks; 1346 /* Total In and Out packets received and sent */ 1347 __u64 opackets; 1348 __u64 ipackets; 1349 /* Total retransmitted chunks */ 1350 __u64 rtxchunks; 1351 /* TSN received > next expected */ 1352 __u64 outofseqtsns; 1353 /* Duplicate Chunks received */ 1354 __u64 idupchunks; 1355 /* Gap Ack Blocks received */ 1356 __u64 gapcnt; 1357 /* Unordered data chunks sent and received */ 1358 __u64 ouodchunks; 1359 __u64 iuodchunks; 1360 /* Ordered data chunks sent and received */ 1361 __u64 oodchunks; 1362 __u64 iodchunks; 1363 /* Control chunks sent and received */ 1364 __u64 octrlchunks; 1365 __u64 ictrlchunks; 1366 }; 1367 1368 /* RFC2960 1369 * 1370 * 12. Recommended Transmission Control Block (TCB) Parameters 1371 * 1372 * This section details a recommended set of parameters that should 1373 * be contained within the TCB for an implementation. This section is 1374 * for illustrative purposes and should not be deemed as requirements 1375 * on an implementation or as an exhaustive list of all parameters 1376 * inside an SCTP TCB. Each implementation may need its own additional 1377 * parameters for optimization. 1378 */ 1379 1380 1381 /* Here we have information about each individual association. */ 1382 struct sctp_association { 1383 1384 /* A base structure common to endpoint and association. 1385 * In this context, it represents the associations's view 1386 * of the local endpoint of the association. 1387 */ 1388 struct sctp_ep_common base; 1389 1390 /* Associations on the same socket. */ 1391 struct list_head asocs; 1392 1393 /* association id. */ 1394 sctp_assoc_t assoc_id; 1395 1396 /* This is our parent endpoint. */ 1397 struct sctp_endpoint *ep; 1398 1399 /* These are those association elements needed in the cookie. */ 1400 struct sctp_cookie c; 1401 1402 /* This is all information about our peer. */ 1403 struct { 1404 /* transport_addr_list 1405 * 1406 * Peer : A list of SCTP transport addresses that the 1407 * Transport : peer is bound to. This information is derived 1408 * Address : from the INIT or INIT ACK and is used to 1409 * List : associate an inbound packet with a given 1410 * : association. Normally this information is 1411 * : hashed or keyed for quick lookup and access 1412 * : of the TCB. 1413 * : The list is also initialized with the list 1414 * : of addresses passed with the sctp_connectx() 1415 * : call. 1416 * 1417 * It is a list of SCTP_transport's. 1418 */ 1419 struct list_head transport_addr_list; 1420 1421 /* rwnd 1422 * 1423 * Peer Rwnd : Current calculated value of the peer's rwnd. 1424 */ 1425 __u32 rwnd; 1426 1427 /* transport_count 1428 * 1429 * Peer : A count of the number of peer addresses 1430 * Transport : in the Peer Transport Address List. 1431 * Address : 1432 * Count : 1433 */ 1434 __u16 transport_count; 1435 1436 /* port 1437 * The transport layer port number. 1438 */ 1439 __u16 port; 1440 1441 /* primary_path 1442 * 1443 * Primary : This is the current primary destination 1444 * Path : transport address of the peer endpoint. It 1445 * : may also specify a source transport address 1446 * : on this endpoint. 1447 * 1448 * All of these paths live on transport_addr_list. 1449 * 1450 * At the bakeoffs, we discovered that the intent of 1451 * primaryPath is that it only changes when the ULP 1452 * asks to have it changed. We add the activePath to 1453 * designate the connection we are currently using to 1454 * transmit new data and most control chunks. 1455 */ 1456 struct sctp_transport *primary_path; 1457 1458 /* Cache the primary path address here, when we 1459 * need a an address for msg_name. 1460 */ 1461 union sctp_addr primary_addr; 1462 1463 /* active_path 1464 * The path that we are currently using to 1465 * transmit new data and most control chunks. 1466 */ 1467 struct sctp_transport *active_path; 1468 1469 /* retran_path 1470 * 1471 * RFC2960 6.4 Multi-homed SCTP Endpoints 1472 * ... 1473 * Furthermore, when its peer is multi-homed, an 1474 * endpoint SHOULD try to retransmit a chunk to an 1475 * active destination transport address that is 1476 * different from the last destination address to 1477 * which the DATA chunk was sent. 1478 */ 1479 struct sctp_transport *retran_path; 1480 1481 /* Pointer to last transport I have sent on. */ 1482 struct sctp_transport *last_sent_to; 1483 1484 /* This is the last transport I have received DATA on. */ 1485 struct sctp_transport *last_data_from; 1486 1487 /* 1488 * Mapping An array of bits or bytes indicating which out of 1489 * Array order TSN's have been received (relative to the 1490 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1491 * order packets have been received, this array 1492 * will be set to all zero. This structure may be 1493 * in the form of a circular buffer or bit array. 1494 * 1495 * Last Rcvd : This is the last TSN received in 1496 * TSN : sequence. This value is set initially by 1497 * : taking the peer's Initial TSN, received in 1498 * : the INIT or INIT ACK chunk, and subtracting 1499 * : one from it. 1500 * 1501 * Throughout most of the specification this is called the 1502 * "Cumulative TSN ACK Point". In this case, we 1503 * ignore the advice in 12.2 in favour of the term 1504 * used in the bulk of the text. This value is hidden 1505 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1506 */ 1507 struct sctp_tsnmap tsn_map; 1508 1509 /* This mask is used to disable sending the ASCONF chunk 1510 * with specified parameter to peer. 1511 */ 1512 __be16 addip_disabled_mask; 1513 1514 /* These are capabilities which our peer advertised. */ 1515 __u8 ecn_capable:1, /* Can peer do ECN? */ 1516 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1517 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1518 hostname_address:1, /* Peer understands DNS addresses? */ 1519 asconf_capable:1, /* Does peer support ADDIP? */ 1520 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1521 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1522 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1523 1524 /* sack_needed : This flag indicates if the next received 1525 * : packet is to be responded to with a 1526 * : SACK. This is initialized to 0. When a packet 1527 * : is received sack_cnt is incremented. If this value 1528 * : reaches 2 or more, a SACK is sent and the 1529 * : value is reset to 0. Note: This is used only 1530 * : when no DATA chunks are received out of 1531 * : order. When DATA chunks are out of order, 1532 * : SACK's are not delayed (see Section 6). 1533 */ 1534 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1535 sack_generation:1, 1536 zero_window_announced:1; 1537 __u32 sack_cnt; 1538 1539 __u32 adaptation_ind; /* Adaptation Code point. */ 1540 1541 struct sctp_inithdr_host i; 1542 void *cookie; 1543 int cookie_len; 1544 1545 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1546 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1547 * Initial TSN Value minus 1 1548 */ 1549 __u32 addip_serial; 1550 1551 /* SCTP-AUTH: We need to know pears random number, hmac list 1552 * and authenticated chunk list. All that is part of the 1553 * cookie and these are just pointers to those locations 1554 */ 1555 sctp_random_param_t *peer_random; 1556 sctp_chunks_param_t *peer_chunks; 1557 sctp_hmac_algo_param_t *peer_hmacs; 1558 } peer; 1559 1560 /* State : A state variable indicating what state the 1561 * : association is in, i.e. COOKIE-WAIT, 1562 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1563 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1564 * 1565 * Note: No "CLOSED" state is illustrated since if a 1566 * association is "CLOSED" its TCB SHOULD be removed. 1567 * 1568 * In this implementation we DO have a CLOSED 1569 * state which is used during initiation and shutdown. 1570 * 1571 * State takes values from SCTP_STATE_*. 1572 */ 1573 sctp_state_t state; 1574 1575 /* Overall : The overall association error count. 1576 * Error Count : [Clear this any time I get something.] 1577 */ 1578 int overall_error_count; 1579 1580 /* The cookie life I award for any cookie. */ 1581 ktime_t cookie_life; 1582 1583 /* These are the association's initial, max, and min RTO values. 1584 * These values will be initialized by system defaults, but can 1585 * be modified via the SCTP_RTOINFO socket option. 1586 */ 1587 unsigned long rto_initial; 1588 unsigned long rto_max; 1589 unsigned long rto_min; 1590 1591 /* Maximum number of new data packets that can be sent in a burst. */ 1592 int max_burst; 1593 1594 /* This is the max_retrans value for the association. This value will 1595 * be initialized initialized from system defaults, but can be 1596 * modified by the SCTP_ASSOCINFO socket option. 1597 */ 1598 int max_retrans; 1599 1600 /* This is the partially failed retrans value for the transport 1601 * and will be initialized from the assocs value. This can be 1602 * changed using the SCTP_PEER_ADDR_THLDS socket option 1603 */ 1604 int pf_retrans; 1605 1606 /* Maximum number of times the endpoint will retransmit INIT */ 1607 __u16 max_init_attempts; 1608 1609 /* How many times have we resent an INIT? */ 1610 __u16 init_retries; 1611 1612 /* The largest timeout or RTO value to use in attempting an INIT */ 1613 unsigned long max_init_timeo; 1614 1615 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1616 * the destination address every heartbeat interval. This value 1617 * will be inherited by all new transports. 1618 */ 1619 unsigned long hbinterval; 1620 1621 /* This is the max_retrans value for new transports in the 1622 * association. 1623 */ 1624 __u16 pathmaxrxt; 1625 1626 /* Flag that path mtu update is pending */ 1627 __u8 pmtu_pending; 1628 1629 /* Association : The smallest PMTU discovered for all of the 1630 * PMTU : peer's transport addresses. 1631 */ 1632 __u32 pathmtu; 1633 1634 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1635 __u32 param_flags; 1636 1637 __u32 sackfreq; 1638 /* SACK delay timeout */ 1639 unsigned long sackdelay; 1640 1641 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1642 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1643 1644 /* Transport to which SHUTDOWN chunk was last sent. */ 1645 struct sctp_transport *shutdown_last_sent_to; 1646 1647 /* Transport to which INIT chunk was last sent. */ 1648 struct sctp_transport *init_last_sent_to; 1649 1650 /* How many times have we resent a SHUTDOWN */ 1651 int shutdown_retries; 1652 1653 /* Next TSN : The next TSN number to be assigned to a new 1654 * : DATA chunk. This is sent in the INIT or INIT 1655 * : ACK chunk to the peer and incremented each 1656 * : time a DATA chunk is assigned a TSN 1657 * : (normally just prior to transmit or during 1658 * : fragmentation). 1659 */ 1660 __u32 next_tsn; 1661 1662 /* 1663 * Last Rcvd : This is the last TSN received in sequence. This value 1664 * TSN : is set initially by taking the peer's Initial TSN, 1665 * : received in the INIT or INIT ACK chunk, and 1666 * : subtracting one from it. 1667 * 1668 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1669 */ 1670 1671 __u32 ctsn_ack_point; 1672 1673 /* PR-SCTP Advanced.Peer.Ack.Point */ 1674 __u32 adv_peer_ack_point; 1675 1676 /* Highest TSN that is acknowledged by incoming SACKs. */ 1677 __u32 highest_sacked; 1678 1679 /* TSN marking the fast recovery exit point */ 1680 __u32 fast_recovery_exit; 1681 1682 /* Flag to track the current fast recovery state */ 1683 __u8 fast_recovery; 1684 1685 /* The number of unacknowledged data chunks. Reported through 1686 * the SCTP_STATUS sockopt. 1687 */ 1688 __u16 unack_data; 1689 1690 /* The total number of data chunks that we've had to retransmit 1691 * as the result of a T3 timer expiration 1692 */ 1693 __u32 rtx_data_chunks; 1694 1695 /* This is the association's receive buffer space. This value is used 1696 * to set a_rwnd field in an INIT or a SACK chunk. 1697 */ 1698 __u32 rwnd; 1699 1700 /* This is the last advertised value of rwnd over a SACK chunk. */ 1701 __u32 a_rwnd; 1702 1703 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1704 * to slop over a maximum of the association's frag_point. 1705 */ 1706 __u32 rwnd_over; 1707 1708 /* Keeps treack of rwnd pressure. This happens when we have 1709 * a window, but not recevie buffer (i.e small packets). This one 1710 * is releases slowly (1 PMTU at a time ). 1711 */ 1712 __u32 rwnd_press; 1713 1714 /* This is the sndbuf size in use for the association. 1715 * This corresponds to the sndbuf size for the association, 1716 * as specified in the sk->sndbuf. 1717 */ 1718 int sndbuf_used; 1719 1720 /* This is the amount of memory that this association has allocated 1721 * in the receive path at any given time. 1722 */ 1723 atomic_t rmem_alloc; 1724 1725 /* This is the wait queue head for send requests waiting on 1726 * the association sndbuf space. 1727 */ 1728 wait_queue_head_t wait; 1729 1730 /* The message size at which SCTP fragmentation will occur. */ 1731 __u32 frag_point; 1732 __u32 user_frag; 1733 1734 /* Counter used to count INIT errors. */ 1735 int init_err_counter; 1736 1737 /* Count the number of INIT cycles (for doubling timeout). */ 1738 int init_cycle; 1739 1740 /* Default send parameters. */ 1741 __u16 default_stream; 1742 __u16 default_flags; 1743 __u32 default_ppid; 1744 __u32 default_context; 1745 __u32 default_timetolive; 1746 1747 /* Default receive parameters */ 1748 __u32 default_rcv_context; 1749 1750 /* Stream arrays */ 1751 struct sctp_stream *stream; 1752 1753 /* All outbound chunks go through this structure. */ 1754 struct sctp_outq outqueue; 1755 1756 /* A smart pipe that will handle reordering and fragmentation, 1757 * as well as handle passing events up to the ULP. 1758 */ 1759 struct sctp_ulpq ulpq; 1760 1761 /* Last TSN that caused an ECNE Chunk to be sent. */ 1762 __u32 last_ecne_tsn; 1763 1764 /* Last TSN that caused a CWR Chunk to be sent. */ 1765 __u32 last_cwr_tsn; 1766 1767 /* How many duplicated TSNs have we seen? */ 1768 int numduptsns; 1769 1770 /* These are to support 1771 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1772 * and Enforcement of Flow and Message Limits" 1773 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1774 * or "ADDIP" for short. 1775 */ 1776 1777 1778 1779 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1780 * 1781 * R1) One and only one ASCONF Chunk MAY be in transit and 1782 * unacknowledged at any one time. If a sender, after sending 1783 * an ASCONF chunk, decides it needs to transfer another 1784 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1785 * returns from the previous ASCONF Chunk before sending a 1786 * subsequent ASCONF. Note this restriction binds each side, 1787 * so at any time two ASCONF may be in-transit on any given 1788 * association (one sent from each endpoint). 1789 * 1790 * [This is our one-and-only-one ASCONF in flight. If we do 1791 * not have an ASCONF in flight, this is NULL.] 1792 */ 1793 struct sctp_chunk *addip_last_asconf; 1794 1795 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1796 * 1797 * This is needed to implement itmes E1 - E4 of the updated 1798 * spec. Here is the justification: 1799 * 1800 * Since the peer may bundle multiple ASCONF chunks toward us, 1801 * we now need the ability to cache multiple ACKs. The section 1802 * describes in detail how they are cached and cleaned up. 1803 */ 1804 struct list_head asconf_ack_list; 1805 1806 /* These ASCONF chunks are waiting to be sent. 1807 * 1808 * These chunaks can't be pushed to outqueue until receiving 1809 * ASCONF_ACK for the previous ASCONF indicated by 1810 * addip_last_asconf, so as to guarantee that only one ASCONF 1811 * is in flight at any time. 1812 * 1813 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1814 * 1815 * In defining the ASCONF Chunk transfer procedures, it is 1816 * essential that these transfers MUST NOT cause congestion 1817 * within the network. To achieve this, we place these 1818 * restrictions on the transfer of ASCONF Chunks: 1819 * 1820 * R1) One and only one ASCONF Chunk MAY be in transit and 1821 * unacknowledged at any one time. If a sender, after sending 1822 * an ASCONF chunk, decides it needs to transfer another 1823 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1824 * returns from the previous ASCONF Chunk before sending a 1825 * subsequent ASCONF. Note this restriction binds each side, 1826 * so at any time two ASCONF may be in-transit on any given 1827 * association (one sent from each endpoint). 1828 * 1829 * 1830 * [I really think this is EXACTLY the sort of intelligence 1831 * which already resides in sctp_outq. Please move this 1832 * queue and its supporting logic down there. --piggy] 1833 */ 1834 struct list_head addip_chunk_list; 1835 1836 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1837 * 1838 * A2) A serial number should be assigned to the Chunk. The 1839 * serial number SHOULD be a monotonically increasing 1840 * number. The serial number SHOULD be initialized at 1841 * the start of the association to the same value as the 1842 * Initial TSN and every time a new ASCONF chunk is created 1843 * it is incremented by one after assigning the serial number 1844 * to the newly created chunk. 1845 * 1846 * ADDIP 1847 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1848 * 1849 * Serial Number : 32 bits (unsigned integer) 1850 * 1851 * This value represents a Serial Number for the ASCONF 1852 * Chunk. The valid range of Serial Number is from 0 to 1853 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1854 * after reaching 4294967295. 1855 */ 1856 __u32 addip_serial; 1857 int src_out_of_asoc_ok; 1858 union sctp_addr *asconf_addr_del_pending; 1859 struct sctp_transport *new_transport; 1860 1861 /* SCTP AUTH: list of the endpoint shared keys. These 1862 * keys are provided out of band by the user applicaton 1863 * and can't change during the lifetime of the association 1864 */ 1865 struct list_head endpoint_shared_keys; 1866 1867 /* SCTP AUTH: 1868 * The current generated assocaition shared key (secret) 1869 */ 1870 struct sctp_auth_bytes *asoc_shared_key; 1871 1872 /* SCTP AUTH: hmac id of the first peer requested algorithm 1873 * that we support. 1874 */ 1875 __u16 default_hmac_id; 1876 1877 __u16 active_key_id; 1878 1879 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1880 temp:1, /* Is it a temporary association? */ 1881 force_delay:1, 1882 prsctp_enable:1, 1883 reconf_enable:1; 1884 1885 __u8 strreset_enable; 1886 __u8 strreset_outstanding; /* request param count on the fly */ 1887 1888 __u32 strreset_outseq; /* Update after receiving response */ 1889 __u32 strreset_inseq; /* Update after receiving request */ 1890 1891 struct sctp_chunk *strreset_chunk; /* save request chunk */ 1892 1893 struct sctp_priv_assoc_stats stats; 1894 1895 int sent_cnt_removable; 1896 1897 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1898 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1899 }; 1900 1901 1902 /* An eyecatcher for determining if we are really looking at an 1903 * association data structure. 1904 */ 1905 enum { 1906 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1907 }; 1908 1909 /* Recover the outter association structure. */ 1910 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1911 { 1912 struct sctp_association *asoc; 1913 1914 asoc = container_of(base, struct sctp_association, base); 1915 return asoc; 1916 } 1917 1918 /* These are function signatures for manipulating associations. */ 1919 1920 1921 struct sctp_association * 1922 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1923 sctp_scope_t scope, gfp_t gfp); 1924 void sctp_association_free(struct sctp_association *); 1925 void sctp_association_put(struct sctp_association *); 1926 void sctp_association_hold(struct sctp_association *); 1927 1928 struct sctp_transport *sctp_assoc_choose_alter_transport( 1929 struct sctp_association *, struct sctp_transport *); 1930 void sctp_assoc_update_retran_path(struct sctp_association *); 1931 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1932 const union sctp_addr *); 1933 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1934 const union sctp_addr *laddr); 1935 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1936 const union sctp_addr *address, 1937 const gfp_t gfp, 1938 const int peer_state); 1939 void sctp_assoc_del_peer(struct sctp_association *asoc, 1940 const union sctp_addr *addr); 1941 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1942 struct sctp_transport *peer); 1943 void sctp_assoc_control_transport(struct sctp_association *, 1944 struct sctp_transport *, 1945 sctp_transport_cmd_t, sctp_sn_error_t); 1946 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1947 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1948 struct net *, 1949 const union sctp_addr *, 1950 const union sctp_addr *); 1951 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1952 void sctp_assoc_update(struct sctp_association *old, 1953 struct sctp_association *new); 1954 1955 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1956 1957 void sctp_assoc_sync_pmtu(struct sctp_association *asoc); 1958 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1959 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1960 void sctp_assoc_set_primary(struct sctp_association *, 1961 struct sctp_transport *); 1962 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1963 struct sctp_transport *); 1964 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1965 sctp_scope_t, gfp_t); 1966 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1967 struct sctp_cookie*, 1968 gfp_t gfp); 1969 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1970 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1971 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1972 const struct sctp_association *asoc, 1973 __be32 serial); 1974 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1975 1976 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1977 const union sctp_addr *ss2); 1978 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1979 1980 /* A convenience structure to parse out SCTP specific CMSGs. */ 1981 typedef struct sctp_cmsgs { 1982 struct sctp_initmsg *init; 1983 struct sctp_sndrcvinfo *srinfo; 1984 struct sctp_sndinfo *sinfo; 1985 } sctp_cmsgs_t; 1986 1987 /* Structure for tracking memory objects */ 1988 typedef struct { 1989 char *label; 1990 atomic_t *counter; 1991 } sctp_dbg_objcnt_entry_t; 1992 1993 #endif /* __sctp_structs_h__ */ 1994