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 sctp_ssnmap; 86 struct crypto_shash; 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 rhashtable 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 } __packed sctp_sender_hb_info_t; 379 380 /* 381 * RFC 2960 1.3.2 Sequenced Delivery within Streams 382 * 383 * The term "stream" is used in SCTP to refer to a sequence of user 384 * messages that are to be delivered to the upper-layer protocol in 385 * order with respect to other messages within the same stream. This is 386 * in contrast to its usage in TCP, where it refers to a sequence of 387 * bytes (in this document a byte is assumed to be eight bits). 388 * ... 389 * 390 * This is the structure we use to track both our outbound and inbound 391 * SSN, or Stream Sequence Numbers. 392 */ 393 394 struct sctp_stream { 395 __u16 *ssn; 396 unsigned int len; 397 }; 398 399 struct sctp_ssnmap { 400 struct sctp_stream in; 401 struct sctp_stream out; 402 }; 403 404 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 405 gfp_t gfp); 406 void sctp_ssnmap_free(struct sctp_ssnmap *map); 407 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 408 409 /* What is the current SSN number for this stream? */ 410 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 411 { 412 return stream->ssn[id]; 413 } 414 415 /* Return the next SSN number for this stream. */ 416 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 417 { 418 return stream->ssn[id]++; 419 } 420 421 /* Skip over this ssn and all below. */ 422 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 423 __u16 ssn) 424 { 425 stream->ssn[id] = ssn+1; 426 } 427 428 /* 429 * Pointers to address related SCTP functions. 430 * (i.e. things that depend on the address family.) 431 */ 432 struct sctp_af { 433 int (*sctp_xmit) (struct sk_buff *skb, 434 struct sctp_transport *); 435 int (*setsockopt) (struct sock *sk, 436 int level, 437 int optname, 438 char __user *optval, 439 unsigned int optlen); 440 int (*getsockopt) (struct sock *sk, 441 int level, 442 int optname, 443 char __user *optval, 444 int __user *optlen); 445 int (*compat_setsockopt) (struct sock *sk, 446 int level, 447 int optname, 448 char __user *optval, 449 unsigned int optlen); 450 int (*compat_getsockopt) (struct sock *sk, 451 int level, 452 int optname, 453 char __user *optval, 454 int __user *optlen); 455 void (*get_dst) (struct sctp_transport *t, 456 union sctp_addr *saddr, 457 struct flowi *fl, 458 struct sock *sk); 459 void (*get_saddr) (struct sctp_sock *sk, 460 struct sctp_transport *t, 461 struct flowi *fl); 462 void (*copy_addrlist) (struct list_head *, 463 struct net_device *); 464 int (*cmp_addr) (const union sctp_addr *addr1, 465 const union sctp_addr *addr2); 466 void (*addr_copy) (union sctp_addr *dst, 467 union sctp_addr *src); 468 void (*from_skb) (union sctp_addr *, 469 struct sk_buff *skb, 470 int saddr); 471 void (*from_sk) (union sctp_addr *, 472 struct sock *sk); 473 void (*from_addr_param) (union sctp_addr *, 474 union sctp_addr_param *, 475 __be16 port, int iif); 476 int (*to_addr_param) (const union sctp_addr *, 477 union sctp_addr_param *); 478 int (*addr_valid) (union sctp_addr *, 479 struct sctp_sock *, 480 const struct sk_buff *); 481 sctp_scope_t (*scope) (union sctp_addr *); 482 void (*inaddr_any) (union sctp_addr *, __be16); 483 int (*is_any) (const union sctp_addr *); 484 int (*available) (union sctp_addr *, 485 struct sctp_sock *); 486 int (*skb_iif) (const struct sk_buff *sk); 487 int (*is_ce) (const struct sk_buff *sk); 488 void (*seq_dump_addr)(struct seq_file *seq, 489 union sctp_addr *addr); 490 void (*ecn_capable)(struct sock *sk); 491 __u16 net_header_len; 492 int sockaddr_len; 493 sa_family_t sa_family; 494 struct list_head list; 495 }; 496 497 struct sctp_af *sctp_get_af_specific(sa_family_t); 498 int sctp_register_af(struct sctp_af *); 499 500 /* Protocol family functions. */ 501 struct sctp_pf { 502 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 503 void (*skb_msgname) (struct sk_buff *, char *, int *); 504 int (*af_supported) (sa_family_t, struct sctp_sock *); 505 int (*cmp_addr) (const union sctp_addr *, 506 const union sctp_addr *, 507 struct sctp_sock *); 508 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 509 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 510 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 511 struct sock *(*create_accept_sk) (struct sock *sk, 512 struct sctp_association *asoc); 513 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 514 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 515 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 516 struct sctp_af *af; 517 }; 518 519 520 /* Structure to track chunk fragments that have been acked, but peer 521 * fragments of the same message have not. 522 */ 523 struct sctp_datamsg { 524 /* Chunks waiting to be submitted to lower layer. */ 525 struct list_head chunks; 526 /* Reference counting. */ 527 atomic_t refcnt; 528 /* When is this message no longer interesting to the peer? */ 529 unsigned long expires_at; 530 /* Did the messenge fail to send? */ 531 int send_error; 532 u8 send_failed:1, 533 can_abandon:1, /* can chunks from this message can be abandoned. */ 534 can_delay; /* should this message be Nagle delayed */ 535 }; 536 537 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 538 struct sctp_sndrcvinfo *, 539 struct iov_iter *); 540 void sctp_datamsg_put(struct sctp_datamsg *); 541 void sctp_chunk_fail(struct sctp_chunk *, int error); 542 int sctp_chunk_abandoned(struct sctp_chunk *); 543 544 /* RFC2960 1.4 Key Terms 545 * 546 * o Chunk: A unit of information within an SCTP packet, consisting of 547 * a chunk header and chunk-specific content. 548 * 549 * As a matter of convenience, we remember the SCTP common header for 550 * each chunk as well as a few other header pointers... 551 */ 552 struct sctp_chunk { 553 struct list_head list; 554 555 atomic_t refcnt; 556 557 /* This is our link to the per-transport transmitted list. */ 558 struct list_head transmitted_list; 559 560 /* This field is used by chunks that hold fragmented data. 561 * For the first fragment this is the list that holds the rest of 562 * fragments. For the remaining fragments, this is the link to the 563 * frag_list maintained in the first fragment. 564 */ 565 struct list_head frag_list; 566 567 /* This points to the sk_buff containing the actual data. */ 568 struct sk_buff *skb; 569 570 /* In case of GSO packets, this will store the head one */ 571 struct sk_buff *head_skb; 572 573 /* These are the SCTP headers by reverse order in a packet. 574 * Note that some of these may happen more than once. In that 575 * case, we point at the "current" one, whatever that means 576 * for that level of header. 577 */ 578 579 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 580 union sctp_params param_hdr; 581 union { 582 __u8 *v; 583 struct sctp_datahdr *data_hdr; 584 struct sctp_inithdr *init_hdr; 585 struct sctp_sackhdr *sack_hdr; 586 struct sctp_heartbeathdr *hb_hdr; 587 struct sctp_sender_hb_info *hbs_hdr; 588 struct sctp_shutdownhdr *shutdown_hdr; 589 struct sctp_signed_cookie *cookie_hdr; 590 struct sctp_ecnehdr *ecne_hdr; 591 struct sctp_cwrhdr *ecn_cwr_hdr; 592 struct sctp_errhdr *err_hdr; 593 struct sctp_addiphdr *addip_hdr; 594 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 595 struct sctp_authhdr *auth_hdr; 596 } subh; 597 598 __u8 *chunk_end; 599 600 struct sctp_chunkhdr *chunk_hdr; 601 struct sctphdr *sctp_hdr; 602 603 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 604 struct sctp_sndrcvinfo sinfo; 605 606 /* We use this field to record param for prsctp policies, 607 * for TTL policy, it is the time_to_drop of this chunk, 608 * for RTX policy, it is the max_sent_count of this chunk, 609 * for PRIO policy, it is the priority of this chunk. 610 */ 611 unsigned long prsctp_param; 612 613 /* How many times this chunk have been sent, for prsctp RTX policy */ 614 int sent_count; 615 616 /* Which association does this belong to? */ 617 struct sctp_association *asoc; 618 619 /* What endpoint received this chunk? */ 620 struct sctp_ep_common *rcvr; 621 622 /* We fill this in if we are calculating RTT. */ 623 unsigned long sent_at; 624 625 /* What is the origin IP address for this chunk? */ 626 union sctp_addr source; 627 /* Destination address for this chunk. */ 628 union sctp_addr dest; 629 630 /* For outbound message, track all fragments for SEND_FAILED. */ 631 struct sctp_datamsg *msg; 632 633 /* For an inbound chunk, this tells us where it came from. 634 * For an outbound chunk, it tells us where we'd like it to 635 * go. It is NULL if we have no preference. 636 */ 637 struct sctp_transport *transport; 638 639 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 640 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 641 * spec violates the principle premis that all chunks are processed 642 * in order. 643 */ 644 struct sk_buff *auth_chunk; 645 646 #define SCTP_CAN_FRTX 0x0 647 #define SCTP_NEED_FRTX 0x1 648 #define SCTP_DONT_FRTX 0x2 649 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 650 resent:1, /* Has this chunk ever been resent. */ 651 has_tsn:1, /* Does this chunk have a TSN yet? */ 652 has_ssn:1, /* Does this chunk have a SSN yet? */ 653 singleton:1, /* Only chunk in the packet? */ 654 end_of_packet:1, /* Last chunk in the packet? */ 655 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 656 pdiscard:1, /* Discard the whole packet now? */ 657 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 658 data_accepted:1, /* At least 1 chunk accepted */ 659 auth:1, /* IN: was auth'ed | OUT: needs auth */ 660 has_asconf:1, /* IN: have seen an asconf before */ 661 tsn_missing_report:2, /* Data chunk missing counter. */ 662 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 663 }; 664 665 void sctp_chunk_hold(struct sctp_chunk *); 666 void sctp_chunk_put(struct sctp_chunk *); 667 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 668 struct iov_iter *from); 669 void sctp_chunk_free(struct sctp_chunk *); 670 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 671 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 672 const struct sctp_association *, 673 struct sock *, gfp_t gfp); 674 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 675 union sctp_addr *); 676 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 677 678 enum { 679 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 680 SCTP_ADDR_SRC, /* address can be used as source */ 681 SCTP_ADDR_DEL, /* address about to be deleted */ 682 }; 683 684 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 685 struct sctp_sockaddr_entry { 686 struct list_head list; 687 struct rcu_head rcu; 688 union sctp_addr a; 689 __u8 state; 690 __u8 valid; 691 }; 692 693 #define SCTP_ADDRESS_TICK_DELAY 500 694 695 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 696 697 /* This structure holds lists of chunks as we are assembling for 698 * transmission. 699 */ 700 struct sctp_packet { 701 /* These are the SCTP header values (host order) for the packet. */ 702 __u16 source_port; 703 __u16 destination_port; 704 __u32 vtag; 705 706 /* This contains the payload chunks. */ 707 struct list_head chunk_list; 708 709 /* This is the overhead of the sctp and ip headers. */ 710 size_t overhead; 711 /* This is the total size of all chunks INCLUDING padding. */ 712 size_t size; 713 /* This is the maximum size this packet may have */ 714 size_t max_size; 715 716 /* The packet is destined for this transport address. 717 * The function we finally use to pass down to the next lower 718 * layer lives in the transport structure. 719 */ 720 struct sctp_transport *transport; 721 722 /* pointer to the auth chunk for this packet */ 723 struct sctp_chunk *auth; 724 725 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 726 has_sack:1, /* This packet contains a SACK chunk. */ 727 has_auth:1, /* This packet contains an AUTH chunk */ 728 has_data:1, /* This packet contains at least 1 DATA chunk */ 729 ipfragok:1; /* So let ip fragment this packet */ 730 }; 731 732 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 733 struct sctp_transport *, 734 __u16 sport, __u16 dport); 735 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 736 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 737 struct sctp_chunk *, int, gfp_t); 738 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 739 struct sctp_chunk *); 740 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 741 void sctp_packet_free(struct sctp_packet *); 742 743 static inline int sctp_packet_empty(struct sctp_packet *packet) 744 { 745 return packet->size == packet->overhead; 746 } 747 748 /* This represents a remote transport address. 749 * For local transport addresses, we just use union sctp_addr. 750 * 751 * RFC2960 Section 1.4 Key Terms 752 * 753 * o Transport address: A Transport Address is traditionally defined 754 * by Network Layer address, Transport Layer protocol and Transport 755 * Layer port number. In the case of SCTP running over IP, a 756 * transport address is defined by the combination of an IP address 757 * and an SCTP port number (where SCTP is the Transport protocol). 758 * 759 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 760 * 761 * o The sender keeps a separate congestion control parameter set for 762 * each of the destination addresses it can send to (not each 763 * source-destination pair but for each destination). The parameters 764 * should decay if the address is not used for a long enough time 765 * period. 766 * 767 */ 768 struct sctp_transport { 769 /* A list of transports. */ 770 struct list_head transports; 771 struct rhash_head node; 772 773 /* Reference counting. */ 774 atomic_t refcnt; 775 /* RTO-Pending : A flag used to track if one of the DATA 776 * chunks sent to this address is currently being 777 * used to compute a RTT. If this flag is 0, 778 * the next DATA chunk sent to this destination 779 * should be used to compute a RTT and this flag 780 * should be set. Every time the RTT 781 * calculation completes (i.e. the DATA chunk 782 * is SACK'd) clear this flag. 783 */ 784 __u32 rto_pending:1, 785 786 /* 787 * hb_sent : a flag that signals that we have a pending 788 * heartbeat. 789 */ 790 hb_sent:1, 791 792 /* Is the Path MTU update pending on this tranport */ 793 pmtu_pending:1, 794 795 /* Has this transport moved the ctsn since we last sacked */ 796 sack_generation:1; 797 u32 dst_cookie; 798 799 struct flowi fl; 800 801 /* This is the peer's IP address and port. */ 802 union sctp_addr ipaddr; 803 804 /* These are the functions we call to handle LLP stuff. */ 805 struct sctp_af *af_specific; 806 807 /* Which association do we belong to? */ 808 struct sctp_association *asoc; 809 810 /* RFC2960 811 * 812 * 12.3 Per Transport Address Data 813 * 814 * For each destination transport address in the peer's 815 * address list derived from the INIT or INIT ACK chunk, a 816 * number of data elements needs to be maintained including: 817 */ 818 /* RTO : The current retransmission timeout value. */ 819 unsigned long rto; 820 821 __u32 rtt; /* This is the most recent RTT. */ 822 823 /* RTTVAR : The current RTT variation. */ 824 __u32 rttvar; 825 826 /* SRTT : The current smoothed round trip time. */ 827 __u32 srtt; 828 829 /* 830 * These are the congestion stats. 831 */ 832 /* cwnd : The current congestion window. */ 833 __u32 cwnd; /* This is the actual cwnd. */ 834 835 /* ssthresh : The current slow start threshold value. */ 836 __u32 ssthresh; 837 838 /* partial : The tracking method for increase of cwnd when in 839 * bytes acked : congestion avoidance mode (see Section 6.2.2) 840 */ 841 __u32 partial_bytes_acked; 842 843 /* Data that has been sent, but not acknowledged. */ 844 __u32 flight_size; 845 846 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 847 848 /* Destination */ 849 struct dst_entry *dst; 850 /* Source address. */ 851 union sctp_addr saddr; 852 853 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 854 * the destination address every heartbeat interval. 855 */ 856 unsigned long hbinterval; 857 858 /* SACK delay timeout */ 859 unsigned long sackdelay; 860 __u32 sackfreq; 861 862 /* When was the last time that we heard from this transport? We use 863 * this to pick new active and retran paths. 864 */ 865 ktime_t last_time_heard; 866 867 /* When was the last time that we sent a chunk using this 868 * transport? We use this to check for idle transports 869 */ 870 unsigned long last_time_sent; 871 872 /* Last time(in jiffies) when cwnd is reduced due to the congestion 873 * indication based on ECNE chunk. 874 */ 875 unsigned long last_time_ecne_reduced; 876 877 /* This is the max_retrans value for the transport and will 878 * be initialized from the assocs value. This can be changed 879 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 880 */ 881 __u16 pathmaxrxt; 882 883 /* This is the partially failed retrans value for the transport 884 * and will be initialized from the assocs value. This can be changed 885 * using the SCTP_PEER_ADDR_THLDS socket option 886 */ 887 int pf_retrans; 888 /* PMTU : The current known path MTU. */ 889 __u32 pathmtu; 890 891 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 892 __u32 param_flags; 893 894 /* The number of times INIT has been sent on this transport. */ 895 int init_sent_count; 896 897 /* state : The current state of this destination, 898 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 899 */ 900 int state; 901 902 /* These are the error stats for this destination. */ 903 904 /* Error count : The current error count for this destination. */ 905 unsigned short error_count; 906 907 /* Per : A timer used by each destination. 908 * Destination : 909 * Timer : 910 * 911 * [Everywhere else in the text this is called T3-rtx. -ed] 912 */ 913 struct timer_list T3_rtx_timer; 914 915 /* Heartbeat timer is per destination. */ 916 struct timer_list hb_timer; 917 918 /* Timer to handle ICMP proto unreachable envets */ 919 struct timer_list proto_unreach_timer; 920 921 /* Since we're using per-destination retransmission timers 922 * (see above), we're also using per-destination "transmitted" 923 * queues. This probably ought to be a private struct 924 * accessible only within the outqueue, but it's not, yet. 925 */ 926 struct list_head transmitted; 927 928 /* We build bundle-able packets for this transport here. */ 929 struct sctp_packet packet; 930 931 /* This is the list of transports that have chunks to send. */ 932 struct list_head send_ready; 933 934 /* State information saved for SFR_CACC algorithm. The key 935 * idea in SFR_CACC is to maintain state at the sender on a 936 * per-destination basis when a changeover happens. 937 * char changeover_active; 938 * char cycling_changeover; 939 * __u32 next_tsn_at_change; 940 * char cacc_saw_newack; 941 */ 942 struct { 943 /* An unsigned integer, which stores the next TSN to be 944 * used by the sender, at the moment of changeover. 945 */ 946 __u32 next_tsn_at_change; 947 948 /* A flag which indicates the occurrence of a changeover */ 949 char changeover_active; 950 951 /* A flag which indicates whether the change of primary is 952 * the first switch to this destination address during an 953 * active switch. 954 */ 955 char cycling_changeover; 956 957 /* A temporary flag, which is used during the processing of 958 * a SACK to estimate the causative TSN(s)'s group. 959 */ 960 char cacc_saw_newack; 961 } cacc; 962 963 /* 64-bit random number sent with heartbeat. */ 964 __u64 hb_nonce; 965 966 struct rcu_head rcu; 967 }; 968 969 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 970 gfp_t); 971 void sctp_transport_set_owner(struct sctp_transport *, 972 struct sctp_association *); 973 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 974 struct sctp_sock *); 975 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 976 void sctp_transport_free(struct sctp_transport *); 977 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 978 void sctp_transport_reset_hb_timer(struct sctp_transport *); 979 int sctp_transport_hold(struct sctp_transport *); 980 void sctp_transport_put(struct sctp_transport *); 981 void sctp_transport_update_rto(struct sctp_transport *, __u32); 982 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 983 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 984 void sctp_transport_burst_limited(struct sctp_transport *); 985 void sctp_transport_burst_reset(struct sctp_transport *); 986 unsigned long sctp_transport_timeout(struct sctp_transport *); 987 void sctp_transport_reset(struct sctp_transport *); 988 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); 989 void sctp_transport_immediate_rtx(struct sctp_transport *); 990 991 992 /* This is the structure we use to queue packets as they come into 993 * SCTP. We write packets to it and read chunks from it. 994 */ 995 struct sctp_inq { 996 /* This is actually a queue of sctp_chunk each 997 * containing a partially decoded packet. 998 */ 999 struct list_head in_chunk_list; 1000 /* This is the packet which is currently off the in queue and is 1001 * being worked on through the inbound chunk processing. 1002 */ 1003 struct sctp_chunk *in_progress; 1004 1005 /* This is the delayed task to finish delivering inbound 1006 * messages. 1007 */ 1008 struct work_struct immediate; 1009 }; 1010 1011 void sctp_inq_init(struct sctp_inq *); 1012 void sctp_inq_free(struct sctp_inq *); 1013 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1014 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1015 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1016 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1017 1018 /* This is the structure we use to hold outbound chunks. You push 1019 * chunks in and they automatically pop out the other end as bundled 1020 * packets (it calls (*output_handler)()). 1021 * 1022 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1023 * and 8.2 of the v13 draft. 1024 * 1025 * It handles retransmissions. The connection to the timeout portion 1026 * of the state machine is through sctp_..._timeout() and timeout_handler. 1027 * 1028 * If you feed it SACKs, it will eat them. 1029 * 1030 * If you give it big chunks, it will fragment them. 1031 * 1032 * It assigns TSN's to data chunks. This happens at the last possible 1033 * instant before transmission. 1034 * 1035 * When free()'d, it empties itself out via output_handler(). 1036 */ 1037 struct sctp_outq { 1038 struct sctp_association *asoc; 1039 1040 /* Data pending that has never been transmitted. */ 1041 struct list_head out_chunk_list; 1042 1043 unsigned int out_qlen; /* Total length of queued data chunks. */ 1044 1045 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1046 unsigned int error; 1047 1048 /* These are control chunks we want to send. */ 1049 struct list_head control_chunk_list; 1050 1051 /* These are chunks that have been sacked but are above the 1052 * CTSN, or cumulative tsn ack point. 1053 */ 1054 struct list_head sacked; 1055 1056 /* Put chunks on this list to schedule them for 1057 * retransmission. 1058 */ 1059 struct list_head retransmit; 1060 1061 /* Put chunks on this list to save them for FWD TSN processing as 1062 * they were abandoned. 1063 */ 1064 struct list_head abandoned; 1065 1066 /* How many unackd bytes do we have in-flight? */ 1067 __u32 outstanding_bytes; 1068 1069 /* Are we doing fast-rtx on this queue */ 1070 char fast_rtx; 1071 1072 /* Corked? */ 1073 char cork; 1074 }; 1075 1076 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1077 void sctp_outq_teardown(struct sctp_outq *); 1078 void sctp_outq_free(struct sctp_outq*); 1079 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1080 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1081 int sctp_outq_is_empty(const struct sctp_outq *); 1082 void sctp_outq_restart(struct sctp_outq *); 1083 1084 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1085 sctp_retransmit_reason_t); 1086 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1087 int sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1088 void sctp_prsctp_prune(struct sctp_association *asoc, 1089 struct sctp_sndrcvinfo *sinfo, int msg_len); 1090 /* Uncork and flush an outqueue. */ 1091 static inline void sctp_outq_cork(struct sctp_outq *q) 1092 { 1093 q->cork = 1; 1094 } 1095 1096 /* SCTP skb control block. 1097 * sctp_input_cb is currently used on rx and sock rx queue 1098 */ 1099 struct sctp_input_cb { 1100 union { 1101 struct inet_skb_parm h4; 1102 #if IS_ENABLED(CONFIG_IPV6) 1103 struct inet6_skb_parm h6; 1104 #endif 1105 } header; 1106 struct sctp_chunk *chunk; 1107 struct sctp_af *af; 1108 }; 1109 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1110 1111 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1112 { 1113 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1114 1115 return chunk->head_skb ? : skb; 1116 } 1117 1118 /* These bind address data fields common between endpoints and associations */ 1119 struct sctp_bind_addr { 1120 1121 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1122 * 1123 * SCTP Port: The local SCTP port number the endpoint is 1124 * bound to. 1125 */ 1126 __u16 port; 1127 1128 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1129 * 1130 * Address List: The list of IP addresses that this instance 1131 * has bound. This information is passed to one's 1132 * peer(s) in INIT and INIT ACK chunks. 1133 */ 1134 struct list_head address_list; 1135 }; 1136 1137 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1138 void sctp_bind_addr_free(struct sctp_bind_addr *); 1139 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1140 const struct sctp_bind_addr *src, 1141 sctp_scope_t scope, gfp_t gfp, 1142 int flags); 1143 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1144 const struct sctp_bind_addr *src, 1145 gfp_t gfp); 1146 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1147 int new_size, __u8 addr_state, gfp_t gfp); 1148 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1149 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1150 struct sctp_sock *); 1151 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1152 struct sctp_sock *, struct sctp_sock *); 1153 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1154 const union sctp_addr *addr); 1155 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1156 const union sctp_addr *addrs, 1157 int addrcnt, 1158 struct sctp_sock *opt); 1159 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1160 int *addrs_len, 1161 gfp_t gfp); 1162 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1163 __u16 port, gfp_t gfp); 1164 1165 sctp_scope_t sctp_scope(const union sctp_addr *); 1166 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1167 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1168 int sctp_is_ep_boundall(struct sock *sk); 1169 1170 1171 /* What type of endpoint? */ 1172 typedef enum { 1173 SCTP_EP_TYPE_SOCKET, 1174 SCTP_EP_TYPE_ASSOCIATION, 1175 } sctp_endpoint_type_t; 1176 1177 /* 1178 * A common base class to bridge the implmentation view of a 1179 * socket (usually listening) endpoint versus an association's 1180 * local endpoint. 1181 * This common structure is useful for several purposes: 1182 * 1) Common interface for lookup routines. 1183 * a) Subfunctions work for either endpoint or association 1184 * b) Single interface to lookup allows hiding the lookup lock rather 1185 * than acquiring it externally. 1186 * 2) Common interface for the inbound chunk handling/state machine. 1187 * 3) Common object handling routines for reference counting, etc. 1188 * 4) Disentangle association lookup from endpoint lookup, where we 1189 * do not have to find our endpoint to find our association. 1190 * 1191 */ 1192 1193 struct sctp_ep_common { 1194 /* Fields to help us manage our entries in the hash tables. */ 1195 struct hlist_node node; 1196 int hashent; 1197 1198 /* Runtime type information. What kind of endpoint is this? */ 1199 sctp_endpoint_type_t type; 1200 1201 /* Some fields to help us manage this object. 1202 * refcnt - Reference count access to this object. 1203 * dead - Do not attempt to use this object. 1204 */ 1205 atomic_t refcnt; 1206 bool dead; 1207 1208 /* What socket does this endpoint belong to? */ 1209 struct sock *sk; 1210 1211 /* This is where we receive inbound chunks. */ 1212 struct sctp_inq inqueue; 1213 1214 /* This substructure includes the defining parameters of the 1215 * endpoint: 1216 * bind_addr.port is our shared port number. 1217 * bind_addr.address_list is our set of local IP addresses. 1218 */ 1219 struct sctp_bind_addr bind_addr; 1220 }; 1221 1222 1223 /* RFC Section 1.4 Key Terms 1224 * 1225 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1226 * multi-homed host, an SCTP endpoint is represented to its peers as a 1227 * combination of a set of eligible destination transport addresses to 1228 * which SCTP packets can be sent and a set of eligible source 1229 * transport addresses from which SCTP packets can be received. 1230 * All transport addresses used by an SCTP endpoint must use the 1231 * same port number, but can use multiple IP addresses. A transport 1232 * address used by an SCTP endpoint must not be used by another 1233 * SCTP endpoint. In other words, a transport address is unique 1234 * to an SCTP endpoint. 1235 * 1236 * From an implementation perspective, each socket has one of these. 1237 * A TCP-style socket will have exactly one association on one of 1238 * these. An UDP-style socket will have multiple associations hanging 1239 * off one of these. 1240 */ 1241 1242 struct sctp_endpoint { 1243 /* Common substructure for endpoint and association. */ 1244 struct sctp_ep_common base; 1245 1246 /* Associations: A list of current associations and mappings 1247 * to the data consumers for each association. This 1248 * may be in the form of a hash table or other 1249 * implementation dependent structure. The data 1250 * consumers may be process identification 1251 * information such as file descriptors, named pipe 1252 * pointer, or table pointers dependent on how SCTP 1253 * is implemented. 1254 */ 1255 /* This is really a list of struct sctp_association entries. */ 1256 struct list_head asocs; 1257 1258 /* Secret Key: A secret key used by this endpoint to compute 1259 * the MAC. This SHOULD be a cryptographic quality 1260 * random number with a sufficient length. 1261 * Discussion in [RFC1750] can be helpful in 1262 * selection of the key. 1263 */ 1264 __u8 secret_key[SCTP_SECRET_SIZE]; 1265 1266 /* digest: This is a digest of the sctp cookie. This field is 1267 * only used on the receive path when we try to validate 1268 * that the cookie has not been tampered with. We put 1269 * this here so we pre-allocate this once and can re-use 1270 * on every receive. 1271 */ 1272 __u8 *digest; 1273 1274 /* sendbuf acct. policy. */ 1275 __u32 sndbuf_policy; 1276 1277 /* rcvbuf acct. policy. */ 1278 __u32 rcvbuf_policy; 1279 1280 /* SCTP AUTH: array of the HMACs that will be allocated 1281 * we need this per association so that we don't serialize 1282 */ 1283 struct crypto_shash **auth_hmacs; 1284 1285 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1286 struct sctp_hmac_algo_param *auth_hmacs_list; 1287 1288 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1289 struct sctp_chunks_param *auth_chunk_list; 1290 1291 /* SCTP-AUTH: endpoint shared keys */ 1292 struct list_head endpoint_shared_keys; 1293 __u16 active_key_id; 1294 __u8 auth_enable:1, 1295 prsctp_enable:1; 1296 }; 1297 1298 /* Recover the outter endpoint structure. */ 1299 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1300 { 1301 struct sctp_endpoint *ep; 1302 1303 ep = container_of(base, struct sctp_endpoint, base); 1304 return ep; 1305 } 1306 1307 /* These are function signatures for manipulating endpoints. */ 1308 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1309 void sctp_endpoint_free(struct sctp_endpoint *); 1310 void sctp_endpoint_put(struct sctp_endpoint *); 1311 void sctp_endpoint_hold(struct sctp_endpoint *); 1312 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1313 struct sctp_association *sctp_endpoint_lookup_assoc( 1314 const struct sctp_endpoint *ep, 1315 const union sctp_addr *paddr, 1316 struct sctp_transport **); 1317 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1318 const union sctp_addr *); 1319 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1320 struct net *, const union sctp_addr *); 1321 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1322 const union sctp_addr *paddr); 1323 1324 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1325 const struct sctp_association *asoc, 1326 sctp_cid_t, sctp_init_chunk_t *peer_init, 1327 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1328 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1329 const union sctp_addr *peer, 1330 sctp_init_chunk_t *init, gfp_t gfp); 1331 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1332 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1333 1334 struct sctp_inithdr_host { 1335 __u32 init_tag; 1336 __u32 a_rwnd; 1337 __u16 num_outbound_streams; 1338 __u16 num_inbound_streams; 1339 __u32 initial_tsn; 1340 }; 1341 1342 /* SCTP_GET_ASSOC_STATS counters */ 1343 struct sctp_priv_assoc_stats { 1344 /* Maximum observed rto in the association during subsequent 1345 * observations. Value is set to 0 if no RTO measurement took place 1346 * The transport where the max_rto was observed is returned in 1347 * obs_rto_ipaddr 1348 */ 1349 struct sockaddr_storage obs_rto_ipaddr; 1350 __u64 max_obs_rto; 1351 /* Total In and Out SACKs received and sent */ 1352 __u64 isacks; 1353 __u64 osacks; 1354 /* Total In and Out packets received and sent */ 1355 __u64 opackets; 1356 __u64 ipackets; 1357 /* Total retransmitted chunks */ 1358 __u64 rtxchunks; 1359 /* TSN received > next expected */ 1360 __u64 outofseqtsns; 1361 /* Duplicate Chunks received */ 1362 __u64 idupchunks; 1363 /* Gap Ack Blocks received */ 1364 __u64 gapcnt; 1365 /* Unordered data chunks sent and received */ 1366 __u64 ouodchunks; 1367 __u64 iuodchunks; 1368 /* Ordered data chunks sent and received */ 1369 __u64 oodchunks; 1370 __u64 iodchunks; 1371 /* Control chunks sent and received */ 1372 __u64 octrlchunks; 1373 __u64 ictrlchunks; 1374 }; 1375 1376 /* RFC2960 1377 * 1378 * 12. Recommended Transmission Control Block (TCB) Parameters 1379 * 1380 * This section details a recommended set of parameters that should 1381 * be contained within the TCB for an implementation. This section is 1382 * for illustrative purposes and should not be deemed as requirements 1383 * on an implementation or as an exhaustive list of all parameters 1384 * inside an SCTP TCB. Each implementation may need its own additional 1385 * parameters for optimization. 1386 */ 1387 1388 1389 /* Here we have information about each individual association. */ 1390 struct sctp_association { 1391 1392 /* A base structure common to endpoint and association. 1393 * In this context, it represents the associations's view 1394 * of the local endpoint of the association. 1395 */ 1396 struct sctp_ep_common base; 1397 1398 /* Associations on the same socket. */ 1399 struct list_head asocs; 1400 1401 /* association id. */ 1402 sctp_assoc_t assoc_id; 1403 1404 /* This is our parent endpoint. */ 1405 struct sctp_endpoint *ep; 1406 1407 /* These are those association elements needed in the cookie. */ 1408 struct sctp_cookie c; 1409 1410 /* This is all information about our peer. */ 1411 struct { 1412 /* transport_addr_list 1413 * 1414 * Peer : A list of SCTP transport addresses that the 1415 * Transport : peer is bound to. This information is derived 1416 * Address : from the INIT or INIT ACK and is used to 1417 * List : associate an inbound packet with a given 1418 * : association. Normally this information is 1419 * : hashed or keyed for quick lookup and access 1420 * : of the TCB. 1421 * : The list is also initialized with the list 1422 * : of addresses passed with the sctp_connectx() 1423 * : call. 1424 * 1425 * It is a list of SCTP_transport's. 1426 */ 1427 struct list_head transport_addr_list; 1428 1429 /* rwnd 1430 * 1431 * Peer Rwnd : Current calculated value of the peer's rwnd. 1432 */ 1433 __u32 rwnd; 1434 1435 /* transport_count 1436 * 1437 * Peer : A count of the number of peer addresses 1438 * Transport : in the Peer Transport Address List. 1439 * Address : 1440 * Count : 1441 */ 1442 __u16 transport_count; 1443 1444 /* port 1445 * The transport layer port number. 1446 */ 1447 __u16 port; 1448 1449 /* primary_path 1450 * 1451 * Primary : This is the current primary destination 1452 * Path : transport address of the peer endpoint. It 1453 * : may also specify a source transport address 1454 * : on this endpoint. 1455 * 1456 * All of these paths live on transport_addr_list. 1457 * 1458 * At the bakeoffs, we discovered that the intent of 1459 * primaryPath is that it only changes when the ULP 1460 * asks to have it changed. We add the activePath to 1461 * designate the connection we are currently using to 1462 * transmit new data and most control chunks. 1463 */ 1464 struct sctp_transport *primary_path; 1465 1466 /* Cache the primary path address here, when we 1467 * need a an address for msg_name. 1468 */ 1469 union sctp_addr primary_addr; 1470 1471 /* active_path 1472 * The path that we are currently using to 1473 * transmit new data and most control chunks. 1474 */ 1475 struct sctp_transport *active_path; 1476 1477 /* retran_path 1478 * 1479 * RFC2960 6.4 Multi-homed SCTP Endpoints 1480 * ... 1481 * Furthermore, when its peer is multi-homed, an 1482 * endpoint SHOULD try to retransmit a chunk to an 1483 * active destination transport address that is 1484 * different from the last destination address to 1485 * which the DATA chunk was sent. 1486 */ 1487 struct sctp_transport *retran_path; 1488 1489 /* Pointer to last transport I have sent on. */ 1490 struct sctp_transport *last_sent_to; 1491 1492 /* This is the last transport I have received DATA on. */ 1493 struct sctp_transport *last_data_from; 1494 1495 /* 1496 * Mapping An array of bits or bytes indicating which out of 1497 * Array order TSN's have been received (relative to the 1498 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1499 * order packets have been received, this array 1500 * will be set to all zero. This structure may be 1501 * in the form of a circular buffer or bit array. 1502 * 1503 * Last Rcvd : This is the last TSN received in 1504 * TSN : sequence. This value is set initially by 1505 * : taking the peer's Initial TSN, received in 1506 * : the INIT or INIT ACK chunk, and subtracting 1507 * : one from it. 1508 * 1509 * Throughout most of the specification this is called the 1510 * "Cumulative TSN ACK Point". In this case, we 1511 * ignore the advice in 12.2 in favour of the term 1512 * used in the bulk of the text. This value is hidden 1513 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1514 */ 1515 struct sctp_tsnmap tsn_map; 1516 1517 /* This mask is used to disable sending the ASCONF chunk 1518 * with specified parameter to peer. 1519 */ 1520 __be16 addip_disabled_mask; 1521 1522 /* These are capabilities which our peer advertised. */ 1523 __u8 ecn_capable:1, /* Can peer do ECN? */ 1524 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1525 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1526 hostname_address:1, /* Peer understands DNS addresses? */ 1527 asconf_capable:1, /* Does peer support ADDIP? */ 1528 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1529 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1530 1531 /* sack_needed : This flag indicates if the next received 1532 * : packet is to be responded to with a 1533 * : SACK. This is initialized to 0. When a packet 1534 * : is received sack_cnt is incremented. If this value 1535 * : reaches 2 or more, a SACK is sent and the 1536 * : value is reset to 0. Note: This is used only 1537 * : when no DATA chunks are received out of 1538 * : order. When DATA chunks are out of order, 1539 * : SACK's are not delayed (see Section 6). 1540 */ 1541 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1542 sack_generation:1, 1543 zero_window_announced:1; 1544 __u32 sack_cnt; 1545 1546 __u32 adaptation_ind; /* Adaptation Code point. */ 1547 1548 struct sctp_inithdr_host i; 1549 void *cookie; 1550 int cookie_len; 1551 1552 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1553 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1554 * Initial TSN Value minus 1 1555 */ 1556 __u32 addip_serial; 1557 1558 /* SCTP-AUTH: We need to know pears random number, hmac list 1559 * and authenticated chunk list. All that is part of the 1560 * cookie and these are just pointers to those locations 1561 */ 1562 sctp_random_param_t *peer_random; 1563 sctp_chunks_param_t *peer_chunks; 1564 sctp_hmac_algo_param_t *peer_hmacs; 1565 } peer; 1566 1567 /* State : A state variable indicating what state the 1568 * : association is in, i.e. COOKIE-WAIT, 1569 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1570 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1571 * 1572 * Note: No "CLOSED" state is illustrated since if a 1573 * association is "CLOSED" its TCB SHOULD be removed. 1574 * 1575 * In this implementation we DO have a CLOSED 1576 * state which is used during initiation and shutdown. 1577 * 1578 * State takes values from SCTP_STATE_*. 1579 */ 1580 sctp_state_t state; 1581 1582 /* Overall : The overall association error count. 1583 * Error Count : [Clear this any time I get something.] 1584 */ 1585 int overall_error_count; 1586 1587 /* The cookie life I award for any cookie. */ 1588 ktime_t cookie_life; 1589 1590 /* These are the association's initial, max, and min RTO values. 1591 * These values will be initialized by system defaults, but can 1592 * be modified via the SCTP_RTOINFO socket option. 1593 */ 1594 unsigned long rto_initial; 1595 unsigned long rto_max; 1596 unsigned long rto_min; 1597 1598 /* Maximum number of new data packets that can be sent in a burst. */ 1599 int max_burst; 1600 1601 /* This is the max_retrans value for the association. This value will 1602 * be initialized initialized from system defaults, but can be 1603 * modified by the SCTP_ASSOCINFO socket option. 1604 */ 1605 int max_retrans; 1606 1607 /* This is the partially failed retrans value for the transport 1608 * and will be initialized from the assocs value. This can be 1609 * changed using the SCTP_PEER_ADDR_THLDS socket option 1610 */ 1611 int pf_retrans; 1612 1613 /* Maximum number of times the endpoint will retransmit INIT */ 1614 __u16 max_init_attempts; 1615 1616 /* How many times have we resent an INIT? */ 1617 __u16 init_retries; 1618 1619 /* The largest timeout or RTO value to use in attempting an INIT */ 1620 unsigned long max_init_timeo; 1621 1622 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1623 * the destination address every heartbeat interval. This value 1624 * will be inherited by all new transports. 1625 */ 1626 unsigned long hbinterval; 1627 1628 /* This is the max_retrans value for new transports in the 1629 * association. 1630 */ 1631 __u16 pathmaxrxt; 1632 1633 /* Flag that path mtu update is pending */ 1634 __u8 pmtu_pending; 1635 1636 /* Association : The smallest PMTU discovered for all of the 1637 * PMTU : peer's transport addresses. 1638 */ 1639 __u32 pathmtu; 1640 1641 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1642 __u32 param_flags; 1643 1644 __u32 sackfreq; 1645 /* SACK delay timeout */ 1646 unsigned long sackdelay; 1647 1648 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1649 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1650 1651 /* Transport to which SHUTDOWN chunk was last sent. */ 1652 struct sctp_transport *shutdown_last_sent_to; 1653 1654 /* Transport to which INIT chunk was last sent. */ 1655 struct sctp_transport *init_last_sent_to; 1656 1657 /* How many times have we resent a SHUTDOWN */ 1658 int shutdown_retries; 1659 1660 /* Next TSN : The next TSN number to be assigned to a new 1661 * : DATA chunk. This is sent in the INIT or INIT 1662 * : ACK chunk to the peer and incremented each 1663 * : time a DATA chunk is assigned a TSN 1664 * : (normally just prior to transmit or during 1665 * : fragmentation). 1666 */ 1667 __u32 next_tsn; 1668 1669 /* 1670 * Last Rcvd : This is the last TSN received in sequence. This value 1671 * TSN : is set initially by taking the peer's Initial TSN, 1672 * : received in the INIT or INIT ACK chunk, and 1673 * : subtracting one from it. 1674 * 1675 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1676 */ 1677 1678 __u32 ctsn_ack_point; 1679 1680 /* PR-SCTP Advanced.Peer.Ack.Point */ 1681 __u32 adv_peer_ack_point; 1682 1683 /* Highest TSN that is acknowledged by incoming SACKs. */ 1684 __u32 highest_sacked; 1685 1686 /* TSN marking the fast recovery exit point */ 1687 __u32 fast_recovery_exit; 1688 1689 /* Flag to track the current fast recovery state */ 1690 __u8 fast_recovery; 1691 1692 /* The number of unacknowledged data chunks. Reported through 1693 * the SCTP_STATUS sockopt. 1694 */ 1695 __u16 unack_data; 1696 1697 /* The total number of data chunks that we've had to retransmit 1698 * as the result of a T3 timer expiration 1699 */ 1700 __u32 rtx_data_chunks; 1701 1702 /* This is the association's receive buffer space. This value is used 1703 * to set a_rwnd field in an INIT or a SACK chunk. 1704 */ 1705 __u32 rwnd; 1706 1707 /* This is the last advertised value of rwnd over a SACK chunk. */ 1708 __u32 a_rwnd; 1709 1710 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1711 * to slop over a maximum of the association's frag_point. 1712 */ 1713 __u32 rwnd_over; 1714 1715 /* Keeps treack of rwnd pressure. This happens when we have 1716 * a window, but not recevie buffer (i.e small packets). This one 1717 * is releases slowly (1 PMTU at a time ). 1718 */ 1719 __u32 rwnd_press; 1720 1721 /* This is the sndbuf size in use for the association. 1722 * This corresponds to the sndbuf size for the association, 1723 * as specified in the sk->sndbuf. 1724 */ 1725 int sndbuf_used; 1726 1727 /* This is the amount of memory that this association has allocated 1728 * in the receive path at any given time. 1729 */ 1730 atomic_t rmem_alloc; 1731 1732 /* This is the wait queue head for send requests waiting on 1733 * the association sndbuf space. 1734 */ 1735 wait_queue_head_t wait; 1736 1737 /* The message size at which SCTP fragmentation will occur. */ 1738 __u32 frag_point; 1739 __u32 user_frag; 1740 1741 /* Counter used to count INIT errors. */ 1742 int init_err_counter; 1743 1744 /* Count the number of INIT cycles (for doubling timeout). */ 1745 int init_cycle; 1746 1747 /* Default send parameters. */ 1748 __u16 default_stream; 1749 __u16 default_flags; 1750 __u32 default_ppid; 1751 __u32 default_context; 1752 __u32 default_timetolive; 1753 1754 /* Default receive parameters */ 1755 __u32 default_rcv_context; 1756 1757 /* This tracks outbound ssn for a given stream. */ 1758 struct sctp_ssnmap *ssnmap; 1759 1760 /* All outbound chunks go through this structure. */ 1761 struct sctp_outq outqueue; 1762 1763 /* A smart pipe that will handle reordering and fragmentation, 1764 * as well as handle passing events up to the ULP. 1765 */ 1766 struct sctp_ulpq ulpq; 1767 1768 /* Last TSN that caused an ECNE Chunk to be sent. */ 1769 __u32 last_ecne_tsn; 1770 1771 /* Last TSN that caused a CWR Chunk to be sent. */ 1772 __u32 last_cwr_tsn; 1773 1774 /* How many duplicated TSNs have we seen? */ 1775 int numduptsns; 1776 1777 /* These are to support 1778 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1779 * and Enforcement of Flow and Message Limits" 1780 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1781 * or "ADDIP" for short. 1782 */ 1783 1784 1785 1786 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1787 * 1788 * R1) One and only one ASCONF Chunk MAY be in transit and 1789 * unacknowledged at any one time. If a sender, after sending 1790 * an ASCONF chunk, decides it needs to transfer another 1791 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1792 * returns from the previous ASCONF Chunk before sending a 1793 * subsequent ASCONF. Note this restriction binds each side, 1794 * so at any time two ASCONF may be in-transit on any given 1795 * association (one sent from each endpoint). 1796 * 1797 * [This is our one-and-only-one ASCONF in flight. If we do 1798 * not have an ASCONF in flight, this is NULL.] 1799 */ 1800 struct sctp_chunk *addip_last_asconf; 1801 1802 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1803 * 1804 * This is needed to implement itmes E1 - E4 of the updated 1805 * spec. Here is the justification: 1806 * 1807 * Since the peer may bundle multiple ASCONF chunks toward us, 1808 * we now need the ability to cache multiple ACKs. The section 1809 * describes in detail how they are cached and cleaned up. 1810 */ 1811 struct list_head asconf_ack_list; 1812 1813 /* These ASCONF chunks are waiting to be sent. 1814 * 1815 * These chunaks can't be pushed to outqueue until receiving 1816 * ASCONF_ACK for the previous ASCONF indicated by 1817 * addip_last_asconf, so as to guarantee that only one ASCONF 1818 * is in flight at any time. 1819 * 1820 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1821 * 1822 * In defining the ASCONF Chunk transfer procedures, it is 1823 * essential that these transfers MUST NOT cause congestion 1824 * within the network. To achieve this, we place these 1825 * restrictions on the transfer of ASCONF Chunks: 1826 * 1827 * R1) One and only one ASCONF Chunk MAY be in transit and 1828 * unacknowledged at any one time. If a sender, after sending 1829 * an ASCONF chunk, decides it needs to transfer another 1830 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1831 * returns from the previous ASCONF Chunk before sending a 1832 * subsequent ASCONF. Note this restriction binds each side, 1833 * so at any time two ASCONF may be in-transit on any given 1834 * association (one sent from each endpoint). 1835 * 1836 * 1837 * [I really think this is EXACTLY the sort of intelligence 1838 * which already resides in sctp_outq. Please move this 1839 * queue and its supporting logic down there. --piggy] 1840 */ 1841 struct list_head addip_chunk_list; 1842 1843 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1844 * 1845 * A2) A serial number should be assigned to the Chunk. The 1846 * serial number SHOULD be a monotonically increasing 1847 * number. The serial number SHOULD be initialized at 1848 * the start of the association to the same value as the 1849 * Initial TSN and every time a new ASCONF chunk is created 1850 * it is incremented by one after assigning the serial number 1851 * to the newly created chunk. 1852 * 1853 * ADDIP 1854 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1855 * 1856 * Serial Number : 32 bits (unsigned integer) 1857 * 1858 * This value represents a Serial Number for the ASCONF 1859 * Chunk. The valid range of Serial Number is from 0 to 1860 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1861 * after reaching 4294967295. 1862 */ 1863 __u32 addip_serial; 1864 int src_out_of_asoc_ok; 1865 union sctp_addr *asconf_addr_del_pending; 1866 struct sctp_transport *new_transport; 1867 1868 /* SCTP AUTH: list of the endpoint shared keys. These 1869 * keys are provided out of band by the user applicaton 1870 * and can't change during the lifetime of the association 1871 */ 1872 struct list_head endpoint_shared_keys; 1873 1874 /* SCTP AUTH: 1875 * The current generated assocaition shared key (secret) 1876 */ 1877 struct sctp_auth_bytes *asoc_shared_key; 1878 1879 /* SCTP AUTH: hmac id of the first peer requested algorithm 1880 * that we support. 1881 */ 1882 __u16 default_hmac_id; 1883 1884 __u16 active_key_id; 1885 1886 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1887 temp:1, /* Is it a temporary association? */ 1888 prsctp_enable:1; 1889 1890 struct sctp_priv_assoc_stats stats; 1891 1892 int sent_cnt_removable; 1893 1894 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1895 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1896 }; 1897 1898 1899 /* An eyecatcher for determining if we are really looking at an 1900 * association data structure. 1901 */ 1902 enum { 1903 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1904 }; 1905 1906 /* Recover the outter association structure. */ 1907 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1908 { 1909 struct sctp_association *asoc; 1910 1911 asoc = container_of(base, struct sctp_association, base); 1912 return asoc; 1913 } 1914 1915 /* These are function signatures for manipulating associations. */ 1916 1917 1918 struct sctp_association * 1919 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1920 sctp_scope_t scope, gfp_t gfp); 1921 void sctp_association_free(struct sctp_association *); 1922 void sctp_association_put(struct sctp_association *); 1923 void sctp_association_hold(struct sctp_association *); 1924 1925 struct sctp_transport *sctp_assoc_choose_alter_transport( 1926 struct sctp_association *, struct sctp_transport *); 1927 void sctp_assoc_update_retran_path(struct sctp_association *); 1928 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1929 const union sctp_addr *); 1930 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1931 const union sctp_addr *laddr); 1932 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1933 const union sctp_addr *address, 1934 const gfp_t gfp, 1935 const int peer_state); 1936 void sctp_assoc_del_peer(struct sctp_association *asoc, 1937 const union sctp_addr *addr); 1938 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1939 struct sctp_transport *peer); 1940 void sctp_assoc_control_transport(struct sctp_association *, 1941 struct sctp_transport *, 1942 sctp_transport_cmd_t, sctp_sn_error_t); 1943 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1944 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1945 struct net *, 1946 const union sctp_addr *, 1947 const union sctp_addr *); 1948 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1949 void sctp_assoc_update(struct sctp_association *old, 1950 struct sctp_association *new); 1951 1952 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1953 1954 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *); 1955 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1956 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1957 void sctp_assoc_set_primary(struct sctp_association *, 1958 struct sctp_transport *); 1959 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1960 struct sctp_transport *); 1961 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1962 sctp_scope_t, gfp_t); 1963 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1964 struct sctp_cookie*, 1965 gfp_t gfp); 1966 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1967 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1968 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1969 const struct sctp_association *asoc, 1970 __be32 serial); 1971 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1972 1973 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1974 const union sctp_addr *ss2); 1975 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1976 1977 /* A convenience structure to parse out SCTP specific CMSGs. */ 1978 typedef struct sctp_cmsgs { 1979 struct sctp_initmsg *init; 1980 struct sctp_sndrcvinfo *srinfo; 1981 struct sctp_sndinfo *sinfo; 1982 } sctp_cmsgs_t; 1983 1984 /* Structure for tracking memory objects */ 1985 typedef struct { 1986 char *label; 1987 atomic_t *counter; 1988 } sctp_dbg_objcnt_entry_t; 1989 1990 #endif /* __sctp_structs_h__ */ 1991