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 87 88 #include <net/sctp/tsnmap.h> 89 #include <net/sctp/ulpevent.h> 90 #include <net/sctp/ulpqueue.h> 91 92 /* Structures useful for managing bind/connect. */ 93 94 struct sctp_bind_bucket { 95 unsigned short port; 96 unsigned short fastreuse; 97 struct hlist_node node; 98 struct hlist_head owner; 99 struct net *net; 100 }; 101 102 struct sctp_bind_hashbucket { 103 spinlock_t lock; 104 struct hlist_head chain; 105 }; 106 107 /* Used for hashing all associations. */ 108 struct sctp_hashbucket { 109 rwlock_t lock; 110 struct hlist_head chain; 111 } __attribute__((__aligned__(8))); 112 113 114 /* The SCTP globals structure. */ 115 extern struct sctp_globals { 116 /* This is a list of groups of functions for each address 117 * family that we support. 118 */ 119 struct list_head address_families; 120 121 /* This is the hash of all endpoints. */ 122 struct sctp_hashbucket *ep_hashtable; 123 /* This is the sctp port control hash. */ 124 struct sctp_bind_hashbucket *port_hashtable; 125 /* This is the hash of all transports. */ 126 struct rhltable transport_hashtable; 127 128 /* Sizes of above hashtables. */ 129 int ep_hashsize; 130 int port_hashsize; 131 132 /* Default initialization values to be applied to new associations. */ 133 __u16 max_instreams; 134 __u16 max_outstreams; 135 136 /* Flag to indicate whether computing and verifying checksum 137 * is disabled. */ 138 bool checksum_disable; 139 } sctp_globals; 140 141 #define sctp_max_instreams (sctp_globals.max_instreams) 142 #define sctp_max_outstreams (sctp_globals.max_outstreams) 143 #define sctp_address_families (sctp_globals.address_families) 144 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 145 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 146 #define sctp_port_hashsize (sctp_globals.port_hashsize) 147 #define sctp_port_hashtable (sctp_globals.port_hashtable) 148 #define sctp_transport_hashtable (sctp_globals.transport_hashtable) 149 #define sctp_checksum_disable (sctp_globals.checksum_disable) 150 151 /* SCTP Socket type: UDP or TCP style. */ 152 typedef enum { 153 SCTP_SOCKET_UDP = 0, 154 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 155 SCTP_SOCKET_TCP 156 } sctp_socket_type_t; 157 158 /* Per socket SCTP information. */ 159 struct sctp_sock { 160 /* inet_sock has to be the first member of sctp_sock */ 161 struct inet_sock inet; 162 /* What kind of a socket is this? */ 163 sctp_socket_type_t type; 164 165 /* PF_ family specific functions. */ 166 struct sctp_pf *pf; 167 168 /* Access to HMAC transform. */ 169 struct crypto_shash *hmac; 170 char *sctp_hmac_alg; 171 172 /* What is our base endpointer? */ 173 struct sctp_endpoint *ep; 174 175 struct sctp_bind_bucket *bind_hash; 176 /* Various Socket Options. */ 177 __u16 default_stream; 178 __u32 default_ppid; 179 __u16 default_flags; 180 __u32 default_context; 181 __u32 default_timetolive; 182 __u32 default_rcv_context; 183 int max_burst; 184 185 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 186 * the destination address every heartbeat interval. This value 187 * will be inherited by all new associations. 188 */ 189 __u32 hbinterval; 190 191 /* This is the max_retrans value for new associations. */ 192 __u16 pathmaxrxt; 193 194 /* The initial Path MTU to use for new associations. */ 195 __u32 pathmtu; 196 197 /* The default SACK delay timeout for new associations. */ 198 __u32 sackdelay; 199 __u32 sackfreq; 200 201 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 202 __u32 param_flags; 203 204 struct sctp_initmsg initmsg; 205 struct sctp_rtoinfo rtoinfo; 206 struct sctp_paddrparams paddrparam; 207 struct sctp_event_subscribe subscribe; 208 struct sctp_assocparams assocparams; 209 210 int user_frag; 211 212 __u32 autoclose; 213 __u32 adaptation_ind; 214 __u32 pd_point; 215 __u16 nodelay:1, 216 disable_fragments:1, 217 v4mapped:1, 218 frag_interleave:1, 219 recvrcvinfo:1, 220 recvnxtinfo:1, 221 data_ready_signalled:1; 222 223 atomic_t pd_mode; 224 /* Receive to here while partial delivery is in effect. */ 225 struct sk_buff_head pd_lobby; 226 227 /* These must be the last fields, as they will skipped on copies, 228 * like on accept and peeloff operations 229 */ 230 struct list_head auto_asconf_list; 231 int do_auto_asconf; 232 }; 233 234 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 235 { 236 return (struct sctp_sock *)sk; 237 } 238 239 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 240 { 241 return (struct sock *)sp; 242 } 243 244 #if IS_ENABLED(CONFIG_IPV6) 245 struct sctp6_sock { 246 struct sctp_sock sctp; 247 struct ipv6_pinfo inet6; 248 }; 249 #endif /* CONFIG_IPV6 */ 250 251 252 /* This is our APPLICATION-SPECIFIC state cookie. 253 * THIS IS NOT DICTATED BY THE SPECIFICATION. 254 */ 255 /* These are the parts of an association which we send in the cookie. 256 * Most of these are straight out of: 257 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 258 * 259 */ 260 261 struct sctp_cookie { 262 263 /* My : Tag expected in every inbound packet and sent 264 * Verification: in the INIT or INIT ACK chunk. 265 * Tag : 266 */ 267 __u32 my_vtag; 268 269 /* Peer's : Tag expected in every outbound packet except 270 * Verification: in the INIT chunk. 271 * Tag : 272 */ 273 __u32 peer_vtag; 274 275 /* The rest of these are not from the spec, but really need to 276 * be in the cookie. 277 */ 278 279 /* My Tie Tag : Assist in discovering a restarting association. */ 280 __u32 my_ttag; 281 282 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 283 __u32 peer_ttag; 284 285 /* When does this cookie expire? */ 286 ktime_t expiration; 287 288 /* Number of inbound/outbound streams which are set 289 * and negotiated during the INIT process. 290 */ 291 __u16 sinit_num_ostreams; 292 __u16 sinit_max_instreams; 293 294 /* This is the first sequence number I used. */ 295 __u32 initial_tsn; 296 297 /* This holds the originating address of the INIT packet. */ 298 union sctp_addr peer_addr; 299 300 /* IG Section 2.35.3 301 * Include the source port of the INIT-ACK 302 */ 303 __u16 my_port; 304 305 __u8 prsctp_capable; 306 307 /* Padding for future use */ 308 __u8 padding; 309 310 __u32 adaptation_ind; 311 312 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 313 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 314 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 315 316 /* This is a shim for my peer's INIT packet, followed by 317 * a copy of the raw address list of the association. 318 * The length of the raw address list is saved in the 319 * raw_addr_list_len field, which will be used at the time when 320 * the association TCB is re-constructed from the cookie. 321 */ 322 __u32 raw_addr_list_len; 323 struct sctp_init_chunk peer_init[0]; 324 }; 325 326 327 /* The format of our cookie that we send to our peer. */ 328 struct sctp_signed_cookie { 329 __u8 signature[SCTP_SECRET_SIZE]; 330 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 331 struct sctp_cookie c; 332 } __packed; 333 334 /* This is another convenience type to allocate memory for address 335 * params for the maximum size and pass such structures around 336 * internally. 337 */ 338 union sctp_addr_param { 339 struct sctp_paramhdr p; 340 struct sctp_ipv4addr_param v4; 341 struct sctp_ipv6addr_param v6; 342 }; 343 344 /* A convenience type to allow walking through the various 345 * parameters and avoid casting all over the place. 346 */ 347 union sctp_params { 348 void *v; 349 struct sctp_paramhdr *p; 350 struct sctp_cookie_preserve_param *life; 351 struct sctp_hostname_param *dns; 352 struct sctp_cookie_param *cookie; 353 struct sctp_supported_addrs_param *sat; 354 struct sctp_ipv4addr_param *v4; 355 struct sctp_ipv6addr_param *v6; 356 union sctp_addr_param *addr; 357 struct sctp_adaptation_ind_param *aind; 358 struct sctp_supported_ext_param *ext; 359 struct sctp_random_param *random; 360 struct sctp_chunks_param *chunks; 361 struct sctp_hmac_algo_param *hmac_algo; 362 struct sctp_addip_param *addip; 363 }; 364 365 /* RFC 2960. Section 3.3.5 Heartbeat. 366 * Heartbeat Information: variable length 367 * The Sender-specific Heartbeat Info field should normally include 368 * information about the sender's current time when this HEARTBEAT 369 * chunk is sent and the destination transport address to which this 370 * HEARTBEAT is sent (see Section 8.3). 371 */ 372 typedef struct sctp_sender_hb_info { 373 struct sctp_paramhdr param_hdr; 374 union sctp_addr daddr; 375 unsigned long sent_at; 376 __u64 hb_nonce; 377 } sctp_sender_hb_info_t; 378 379 struct sctp_stream *sctp_stream_new(__u16 incnt, __u16 outcnt, gfp_t gfp); 380 void sctp_stream_free(struct sctp_stream *stream); 381 void sctp_stream_clear(struct sctp_stream *stream); 382 383 /* What is the current SSN number for this stream? */ 384 #define sctp_ssn_peek(stream, type, sid) \ 385 ((stream)->type[sid].ssn) 386 387 /* Return the next SSN number for this stream. */ 388 #define sctp_ssn_next(stream, type, sid) \ 389 ((stream)->type[sid].ssn++) 390 391 /* Skip over this ssn and all below. */ 392 #define sctp_ssn_skip(stream, type, sid, ssn) \ 393 ((stream)->type[sid].ssn = ssn + 1) 394 395 /* 396 * Pointers to address related SCTP functions. 397 * (i.e. things that depend on the address family.) 398 */ 399 struct sctp_af { 400 int (*sctp_xmit) (struct sk_buff *skb, 401 struct sctp_transport *); 402 int (*setsockopt) (struct sock *sk, 403 int level, 404 int optname, 405 char __user *optval, 406 unsigned int optlen); 407 int (*getsockopt) (struct sock *sk, 408 int level, 409 int optname, 410 char __user *optval, 411 int __user *optlen); 412 int (*compat_setsockopt) (struct sock *sk, 413 int level, 414 int optname, 415 char __user *optval, 416 unsigned int optlen); 417 int (*compat_getsockopt) (struct sock *sk, 418 int level, 419 int optname, 420 char __user *optval, 421 int __user *optlen); 422 void (*get_dst) (struct sctp_transport *t, 423 union sctp_addr *saddr, 424 struct flowi *fl, 425 struct sock *sk); 426 void (*get_saddr) (struct sctp_sock *sk, 427 struct sctp_transport *t, 428 struct flowi *fl); 429 void (*copy_addrlist) (struct list_head *, 430 struct net_device *); 431 int (*cmp_addr) (const union sctp_addr *addr1, 432 const union sctp_addr *addr2); 433 void (*addr_copy) (union sctp_addr *dst, 434 union sctp_addr *src); 435 void (*from_skb) (union sctp_addr *, 436 struct sk_buff *skb, 437 int saddr); 438 void (*from_sk) (union sctp_addr *, 439 struct sock *sk); 440 void (*from_addr_param) (union sctp_addr *, 441 union sctp_addr_param *, 442 __be16 port, int iif); 443 int (*to_addr_param) (const union sctp_addr *, 444 union sctp_addr_param *); 445 int (*addr_valid) (union sctp_addr *, 446 struct sctp_sock *, 447 const struct sk_buff *); 448 sctp_scope_t (*scope) (union sctp_addr *); 449 void (*inaddr_any) (union sctp_addr *, __be16); 450 int (*is_any) (const union sctp_addr *); 451 int (*available) (union sctp_addr *, 452 struct sctp_sock *); 453 int (*skb_iif) (const struct sk_buff *sk); 454 int (*is_ce) (const struct sk_buff *sk); 455 void (*seq_dump_addr)(struct seq_file *seq, 456 union sctp_addr *addr); 457 void (*ecn_capable)(struct sock *sk); 458 __u16 net_header_len; 459 int sockaddr_len; 460 sa_family_t sa_family; 461 struct list_head list; 462 }; 463 464 struct sctp_af *sctp_get_af_specific(sa_family_t); 465 int sctp_register_af(struct sctp_af *); 466 467 /* Protocol family functions. */ 468 struct sctp_pf { 469 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 470 void (*skb_msgname) (struct sk_buff *, char *, int *); 471 int (*af_supported) (sa_family_t, struct sctp_sock *); 472 int (*cmp_addr) (const union sctp_addr *, 473 const union sctp_addr *, 474 struct sctp_sock *); 475 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 476 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 477 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 478 struct sock *(*create_accept_sk) (struct sock *sk, 479 struct sctp_association *asoc); 480 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 481 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 482 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 483 struct sctp_af *af; 484 }; 485 486 487 /* Structure to track chunk fragments that have been acked, but peer 488 * fragments of the same message have not. 489 */ 490 struct sctp_datamsg { 491 /* Chunks waiting to be submitted to lower layer. */ 492 struct list_head chunks; 493 /* Reference counting. */ 494 atomic_t refcnt; 495 /* When is this message no longer interesting to the peer? */ 496 unsigned long expires_at; 497 /* Did the messenge fail to send? */ 498 int send_error; 499 u8 send_failed:1, 500 force_delay:1, 501 can_delay; /* should this message be Nagle delayed */ 502 }; 503 504 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 505 struct sctp_sndrcvinfo *, 506 struct iov_iter *); 507 void sctp_datamsg_free(struct sctp_datamsg *); 508 void sctp_datamsg_put(struct sctp_datamsg *); 509 void sctp_chunk_fail(struct sctp_chunk *, int error); 510 int sctp_chunk_abandoned(struct sctp_chunk *); 511 512 /* RFC2960 1.4 Key Terms 513 * 514 * o Chunk: A unit of information within an SCTP packet, consisting of 515 * a chunk header and chunk-specific content. 516 * 517 * As a matter of convenience, we remember the SCTP common header for 518 * each chunk as well as a few other header pointers... 519 */ 520 struct sctp_chunk { 521 struct list_head list; 522 523 atomic_t refcnt; 524 525 /* How many times this chunk have been sent, for prsctp RTX policy */ 526 int sent_count; 527 528 /* This is our link to the per-transport transmitted list. */ 529 struct list_head transmitted_list; 530 531 /* This field is used by chunks that hold fragmented data. 532 * For the first fragment this is the list that holds the rest of 533 * fragments. For the remaining fragments, this is the link to the 534 * frag_list maintained in the first fragment. 535 */ 536 struct list_head frag_list; 537 538 /* This points to the sk_buff containing the actual data. */ 539 struct sk_buff *skb; 540 541 /* In case of GSO packets, this will store the head one */ 542 struct sk_buff *head_skb; 543 544 /* These are the SCTP headers by reverse order in a packet. 545 * Note that some of these may happen more than once. In that 546 * case, we point at the "current" one, whatever that means 547 * for that level of header. 548 */ 549 550 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 551 union sctp_params param_hdr; 552 union { 553 __u8 *v; 554 struct sctp_datahdr *data_hdr; 555 struct sctp_inithdr *init_hdr; 556 struct sctp_sackhdr *sack_hdr; 557 struct sctp_heartbeathdr *hb_hdr; 558 struct sctp_sender_hb_info *hbs_hdr; 559 struct sctp_shutdownhdr *shutdown_hdr; 560 struct sctp_signed_cookie *cookie_hdr; 561 struct sctp_ecnehdr *ecne_hdr; 562 struct sctp_cwrhdr *ecn_cwr_hdr; 563 struct sctp_errhdr *err_hdr; 564 struct sctp_addiphdr *addip_hdr; 565 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 566 struct sctp_authhdr *auth_hdr; 567 } subh; 568 569 __u8 *chunk_end; 570 571 struct sctp_chunkhdr *chunk_hdr; 572 struct sctphdr *sctp_hdr; 573 574 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 575 struct sctp_sndrcvinfo sinfo; 576 577 /* Which association does this belong to? */ 578 struct sctp_association *asoc; 579 580 /* What endpoint received this chunk? */ 581 struct sctp_ep_common *rcvr; 582 583 /* We fill this in if we are calculating RTT. */ 584 unsigned long sent_at; 585 586 /* What is the origin IP address for this chunk? */ 587 union sctp_addr source; 588 /* Destination address for this chunk. */ 589 union sctp_addr dest; 590 591 /* For outbound message, track all fragments for SEND_FAILED. */ 592 struct sctp_datamsg *msg; 593 594 /* For an inbound chunk, this tells us where it came from. 595 * For an outbound chunk, it tells us where we'd like it to 596 * go. It is NULL if we have no preference. 597 */ 598 struct sctp_transport *transport; 599 600 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 601 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 602 * spec violates the principle premis that all chunks are processed 603 * in order. 604 */ 605 struct sk_buff *auth_chunk; 606 607 #define SCTP_CAN_FRTX 0x0 608 #define SCTP_NEED_FRTX 0x1 609 #define SCTP_DONT_FRTX 0x2 610 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 611 has_tsn:1, /* Does this chunk have a TSN yet? */ 612 has_ssn:1, /* Does this chunk have a SSN yet? */ 613 singleton:1, /* Only chunk in the packet? */ 614 end_of_packet:1, /* Last chunk in the packet? */ 615 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 616 pdiscard:1, /* Discard the whole packet now? */ 617 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 618 data_accepted:1, /* At least 1 chunk accepted */ 619 auth:1, /* IN: was auth'ed | OUT: needs auth */ 620 has_asconf:1, /* IN: have seen an asconf before */ 621 tsn_missing_report:2, /* Data chunk missing counter. */ 622 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 623 }; 624 625 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 626 void sctp_chunk_hold(struct sctp_chunk *); 627 void sctp_chunk_put(struct sctp_chunk *); 628 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 629 struct iov_iter *from); 630 void sctp_chunk_free(struct sctp_chunk *); 631 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 632 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 633 const struct sctp_association *, 634 struct sock *, gfp_t gfp); 635 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 636 union sctp_addr *); 637 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 638 639 enum { 640 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 641 SCTP_ADDR_SRC, /* address can be used as source */ 642 SCTP_ADDR_DEL, /* address about to be deleted */ 643 }; 644 645 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 646 struct sctp_sockaddr_entry { 647 struct list_head list; 648 struct rcu_head rcu; 649 union sctp_addr a; 650 __u8 state; 651 __u8 valid; 652 }; 653 654 #define SCTP_ADDRESS_TICK_DELAY 500 655 656 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 657 658 /* This structure holds lists of chunks as we are assembling for 659 * transmission. 660 */ 661 struct sctp_packet { 662 /* These are the SCTP header values (host order) for the packet. */ 663 __u16 source_port; 664 __u16 destination_port; 665 __u32 vtag; 666 667 /* This contains the payload chunks. */ 668 struct list_head chunk_list; 669 670 /* This is the overhead of the sctp and ip headers. */ 671 size_t overhead; 672 /* This is the total size of all chunks INCLUDING padding. */ 673 size_t size; 674 /* This is the maximum size this packet may have */ 675 size_t max_size; 676 677 /* The packet is destined for this transport address. 678 * The function we finally use to pass down to the next lower 679 * layer lives in the transport structure. 680 */ 681 struct sctp_transport *transport; 682 683 /* pointer to the auth chunk for this packet */ 684 struct sctp_chunk *auth; 685 686 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 687 has_sack:1, /* This packet contains a SACK chunk. */ 688 has_auth:1, /* This packet contains an AUTH chunk */ 689 has_data:1, /* This packet contains at least 1 DATA chunk */ 690 ipfragok:1; /* So let ip fragment this packet */ 691 }; 692 693 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 694 __u16 sport, __u16 dport); 695 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 696 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 697 struct sctp_chunk *, int, gfp_t); 698 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 699 struct sctp_chunk *); 700 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 701 void sctp_packet_free(struct sctp_packet *); 702 703 static inline int sctp_packet_empty(struct sctp_packet *packet) 704 { 705 return packet->size == packet->overhead; 706 } 707 708 /* This represents a remote transport address. 709 * For local transport addresses, we just use union sctp_addr. 710 * 711 * RFC2960 Section 1.4 Key Terms 712 * 713 * o Transport address: A Transport Address is traditionally defined 714 * by Network Layer address, Transport Layer protocol and Transport 715 * Layer port number. In the case of SCTP running over IP, a 716 * transport address is defined by the combination of an IP address 717 * and an SCTP port number (where SCTP is the Transport protocol). 718 * 719 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 720 * 721 * o The sender keeps a separate congestion control parameter set for 722 * each of the destination addresses it can send to (not each 723 * source-destination pair but for each destination). The parameters 724 * should decay if the address is not used for a long enough time 725 * period. 726 * 727 */ 728 struct sctp_transport { 729 /* A list of transports. */ 730 struct list_head transports; 731 struct rhlist_head node; 732 733 /* Reference counting. */ 734 atomic_t refcnt; 735 /* RTO-Pending : A flag used to track if one of the DATA 736 * chunks sent to this address is currently being 737 * used to compute a RTT. If this flag is 0, 738 * the next DATA chunk sent to this destination 739 * should be used to compute a RTT and this flag 740 * should be set. Every time the RTT 741 * calculation completes (i.e. the DATA chunk 742 * is SACK'd) clear this flag. 743 */ 744 __u32 rto_pending:1, 745 746 /* 747 * hb_sent : a flag that signals that we have a pending 748 * heartbeat. 749 */ 750 hb_sent:1, 751 752 /* Is the Path MTU update pending on this tranport */ 753 pmtu_pending:1, 754 755 /* Has this transport moved the ctsn since we last sacked */ 756 sack_generation:1; 757 u32 dst_cookie; 758 759 struct flowi fl; 760 761 /* This is the peer's IP address and port. */ 762 union sctp_addr ipaddr; 763 764 /* These are the functions we call to handle LLP stuff. */ 765 struct sctp_af *af_specific; 766 767 /* Which association do we belong to? */ 768 struct sctp_association *asoc; 769 770 /* RFC2960 771 * 772 * 12.3 Per Transport Address Data 773 * 774 * For each destination transport address in the peer's 775 * address list derived from the INIT or INIT ACK chunk, a 776 * number of data elements needs to be maintained including: 777 */ 778 /* RTO : The current retransmission timeout value. */ 779 unsigned long rto; 780 781 __u32 rtt; /* This is the most recent RTT. */ 782 783 /* RTTVAR : The current RTT variation. */ 784 __u32 rttvar; 785 786 /* SRTT : The current smoothed round trip time. */ 787 __u32 srtt; 788 789 /* 790 * These are the congestion stats. 791 */ 792 /* cwnd : The current congestion window. */ 793 __u32 cwnd; /* This is the actual cwnd. */ 794 795 /* ssthresh : The current slow start threshold value. */ 796 __u32 ssthresh; 797 798 /* partial : The tracking method for increase of cwnd when in 799 * bytes acked : congestion avoidance mode (see Section 6.2.2) 800 */ 801 __u32 partial_bytes_acked; 802 803 /* Data that has been sent, but not acknowledged. */ 804 __u32 flight_size; 805 806 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 807 808 __u32 dst_pending_confirm; /* need to confirm neighbour */ 809 810 /* Destination */ 811 struct dst_entry *dst; 812 /* Source address. */ 813 union sctp_addr saddr; 814 815 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 816 * the destination address every heartbeat interval. 817 */ 818 unsigned long hbinterval; 819 820 /* SACK delay timeout */ 821 unsigned long sackdelay; 822 __u32 sackfreq; 823 824 /* When was the last time that we heard from this transport? We use 825 * this to pick new active and retran paths. 826 */ 827 ktime_t last_time_heard; 828 829 /* When was the last time that we sent a chunk using this 830 * transport? We use this to check for idle transports 831 */ 832 unsigned long last_time_sent; 833 834 /* Last time(in jiffies) when cwnd is reduced due to the congestion 835 * indication based on ECNE chunk. 836 */ 837 unsigned long last_time_ecne_reduced; 838 839 /* This is the max_retrans value for the transport and will 840 * be initialized from the assocs value. This can be changed 841 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 842 */ 843 __u16 pathmaxrxt; 844 845 /* This is the partially failed retrans value for the transport 846 * and will be initialized from the assocs value. This can be changed 847 * using the SCTP_PEER_ADDR_THLDS socket option 848 */ 849 int pf_retrans; 850 /* PMTU : The current known path MTU. */ 851 __u32 pathmtu; 852 853 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 854 __u32 param_flags; 855 856 /* The number of times INIT has been sent on this transport. */ 857 int init_sent_count; 858 859 /* state : The current state of this destination, 860 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 861 */ 862 int state; 863 864 /* These are the error stats for this destination. */ 865 866 /* Error count : The current error count for this destination. */ 867 unsigned short error_count; 868 869 /* Per : A timer used by each destination. 870 * Destination : 871 * Timer : 872 * 873 * [Everywhere else in the text this is called T3-rtx. -ed] 874 */ 875 struct timer_list T3_rtx_timer; 876 877 /* Heartbeat timer is per destination. */ 878 struct timer_list hb_timer; 879 880 /* Timer to handle ICMP proto unreachable envets */ 881 struct timer_list proto_unreach_timer; 882 883 /* Timer to handler reconf chunk rtx */ 884 struct timer_list reconf_timer; 885 886 /* Since we're using per-destination retransmission timers 887 * (see above), we're also using per-destination "transmitted" 888 * queues. This probably ought to be a private struct 889 * accessible only within the outqueue, but it's not, yet. 890 */ 891 struct list_head transmitted; 892 893 /* We build bundle-able packets for this transport here. */ 894 struct sctp_packet packet; 895 896 /* This is the list of transports that have chunks to send. */ 897 struct list_head send_ready; 898 899 /* State information saved for SFR_CACC algorithm. The key 900 * idea in SFR_CACC is to maintain state at the sender on a 901 * per-destination basis when a changeover happens. 902 * char changeover_active; 903 * char cycling_changeover; 904 * __u32 next_tsn_at_change; 905 * char cacc_saw_newack; 906 */ 907 struct { 908 /* An unsigned integer, which stores the next TSN to be 909 * used by the sender, at the moment of changeover. 910 */ 911 __u32 next_tsn_at_change; 912 913 /* A flag which indicates the occurrence of a changeover */ 914 char changeover_active; 915 916 /* A flag which indicates whether the change of primary is 917 * the first switch to this destination address during an 918 * active switch. 919 */ 920 char cycling_changeover; 921 922 /* A temporary flag, which is used during the processing of 923 * a SACK to estimate the causative TSN(s)'s group. 924 */ 925 char cacc_saw_newack; 926 } cacc; 927 928 /* 64-bit random number sent with heartbeat. */ 929 __u64 hb_nonce; 930 931 struct rcu_head rcu; 932 }; 933 934 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 935 gfp_t); 936 void sctp_transport_set_owner(struct sctp_transport *, 937 struct sctp_association *); 938 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 939 struct sctp_sock *); 940 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 941 void sctp_transport_free(struct sctp_transport *); 942 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 943 void sctp_transport_reset_hb_timer(struct sctp_transport *); 944 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 945 int sctp_transport_hold(struct sctp_transport *); 946 void sctp_transport_put(struct sctp_transport *); 947 void sctp_transport_update_rto(struct sctp_transport *, __u32); 948 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 949 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 950 void sctp_transport_burst_limited(struct sctp_transport *); 951 void sctp_transport_burst_reset(struct sctp_transport *); 952 unsigned long sctp_transport_timeout(struct sctp_transport *); 953 void sctp_transport_reset(struct sctp_transport *); 954 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); 955 void sctp_transport_immediate_rtx(struct sctp_transport *); 956 void sctp_transport_dst_release(struct sctp_transport *t); 957 void sctp_transport_dst_confirm(struct sctp_transport *t); 958 959 960 /* This is the structure we use to queue packets as they come into 961 * SCTP. We write packets to it and read chunks from it. 962 */ 963 struct sctp_inq { 964 /* This is actually a queue of sctp_chunk each 965 * containing a partially decoded packet. 966 */ 967 struct list_head in_chunk_list; 968 /* This is the packet which is currently off the in queue and is 969 * being worked on through the inbound chunk processing. 970 */ 971 struct sctp_chunk *in_progress; 972 973 /* This is the delayed task to finish delivering inbound 974 * messages. 975 */ 976 struct work_struct immediate; 977 }; 978 979 void sctp_inq_init(struct sctp_inq *); 980 void sctp_inq_free(struct sctp_inq *); 981 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 982 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 983 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 984 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 985 986 /* This is the structure we use to hold outbound chunks. You push 987 * chunks in and they automatically pop out the other end as bundled 988 * packets (it calls (*output_handler)()). 989 * 990 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 991 * and 8.2 of the v13 draft. 992 * 993 * It handles retransmissions. The connection to the timeout portion 994 * of the state machine is through sctp_..._timeout() and timeout_handler. 995 * 996 * If you feed it SACKs, it will eat them. 997 * 998 * If you give it big chunks, it will fragment them. 999 * 1000 * It assigns TSN's to data chunks. This happens at the last possible 1001 * instant before transmission. 1002 * 1003 * When free()'d, it empties itself out via output_handler(). 1004 */ 1005 struct sctp_outq { 1006 struct sctp_association *asoc; 1007 1008 /* Data pending that has never been transmitted. */ 1009 struct list_head out_chunk_list; 1010 1011 unsigned int out_qlen; /* Total length of queued data chunks. */ 1012 1013 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1014 unsigned int error; 1015 1016 /* These are control chunks we want to send. */ 1017 struct list_head control_chunk_list; 1018 1019 /* These are chunks that have been sacked but are above the 1020 * CTSN, or cumulative tsn ack point. 1021 */ 1022 struct list_head sacked; 1023 1024 /* Put chunks on this list to schedule them for 1025 * retransmission. 1026 */ 1027 struct list_head retransmit; 1028 1029 /* Put chunks on this list to save them for FWD TSN processing as 1030 * they were abandoned. 1031 */ 1032 struct list_head abandoned; 1033 1034 /* How many unackd bytes do we have in-flight? */ 1035 __u32 outstanding_bytes; 1036 1037 /* Are we doing fast-rtx on this queue */ 1038 char fast_rtx; 1039 1040 /* Corked? */ 1041 char cork; 1042 }; 1043 1044 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1045 void sctp_outq_teardown(struct sctp_outq *); 1046 void sctp_outq_free(struct sctp_outq*); 1047 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1048 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1049 int sctp_outq_is_empty(const struct sctp_outq *); 1050 void sctp_outq_restart(struct sctp_outq *); 1051 1052 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1053 sctp_retransmit_reason_t); 1054 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1055 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1056 void sctp_prsctp_prune(struct sctp_association *asoc, 1057 struct sctp_sndrcvinfo *sinfo, int msg_len); 1058 /* Uncork and flush an outqueue. */ 1059 static inline void sctp_outq_cork(struct sctp_outq *q) 1060 { 1061 q->cork = 1; 1062 } 1063 1064 /* SCTP skb control block. 1065 * sctp_input_cb is currently used on rx and sock rx queue 1066 */ 1067 struct sctp_input_cb { 1068 union { 1069 struct inet_skb_parm h4; 1070 #if IS_ENABLED(CONFIG_IPV6) 1071 struct inet6_skb_parm h6; 1072 #endif 1073 } header; 1074 struct sctp_chunk *chunk; 1075 struct sctp_af *af; 1076 }; 1077 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1078 1079 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1080 { 1081 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1082 1083 return chunk->head_skb ? : skb; 1084 } 1085 1086 /* These bind address data fields common between endpoints and associations */ 1087 struct sctp_bind_addr { 1088 1089 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1090 * 1091 * SCTP Port: The local SCTP port number the endpoint is 1092 * bound to. 1093 */ 1094 __u16 port; 1095 1096 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1097 * 1098 * Address List: The list of IP addresses that this instance 1099 * has bound. This information is passed to one's 1100 * peer(s) in INIT and INIT ACK chunks. 1101 */ 1102 struct list_head address_list; 1103 }; 1104 1105 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1106 void sctp_bind_addr_free(struct sctp_bind_addr *); 1107 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1108 const struct sctp_bind_addr *src, 1109 sctp_scope_t scope, gfp_t gfp, 1110 int flags); 1111 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1112 const struct sctp_bind_addr *src, 1113 gfp_t gfp); 1114 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1115 int new_size, __u8 addr_state, gfp_t gfp); 1116 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1117 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1118 struct sctp_sock *); 1119 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1120 struct sctp_sock *, struct sctp_sock *); 1121 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1122 const union sctp_addr *addr); 1123 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1124 const union sctp_addr *addrs, 1125 int addrcnt, 1126 struct sctp_sock *opt); 1127 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1128 int *addrs_len, 1129 gfp_t gfp); 1130 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1131 __u16 port, gfp_t gfp); 1132 1133 sctp_scope_t sctp_scope(const union sctp_addr *); 1134 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1135 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1136 int sctp_is_ep_boundall(struct sock *sk); 1137 1138 1139 /* What type of endpoint? */ 1140 typedef enum { 1141 SCTP_EP_TYPE_SOCKET, 1142 SCTP_EP_TYPE_ASSOCIATION, 1143 } sctp_endpoint_type_t; 1144 1145 /* 1146 * A common base class to bridge the implmentation view of a 1147 * socket (usually listening) endpoint versus an association's 1148 * local endpoint. 1149 * This common structure is useful for several purposes: 1150 * 1) Common interface for lookup routines. 1151 * a) Subfunctions work for either endpoint or association 1152 * b) Single interface to lookup allows hiding the lookup lock rather 1153 * than acquiring it externally. 1154 * 2) Common interface for the inbound chunk handling/state machine. 1155 * 3) Common object handling routines for reference counting, etc. 1156 * 4) Disentangle association lookup from endpoint lookup, where we 1157 * do not have to find our endpoint to find our association. 1158 * 1159 */ 1160 1161 struct sctp_ep_common { 1162 /* Fields to help us manage our entries in the hash tables. */ 1163 struct hlist_node node; 1164 int hashent; 1165 1166 /* Runtime type information. What kind of endpoint is this? */ 1167 sctp_endpoint_type_t type; 1168 1169 /* Some fields to help us manage this object. 1170 * refcnt - Reference count access to this object. 1171 * dead - Do not attempt to use this object. 1172 */ 1173 atomic_t refcnt; 1174 bool dead; 1175 1176 /* What socket does this endpoint belong to? */ 1177 struct sock *sk; 1178 1179 /* This is where we receive inbound chunks. */ 1180 struct sctp_inq inqueue; 1181 1182 /* This substructure includes the defining parameters of the 1183 * endpoint: 1184 * bind_addr.port is our shared port number. 1185 * bind_addr.address_list is our set of local IP addresses. 1186 */ 1187 struct sctp_bind_addr bind_addr; 1188 }; 1189 1190 1191 /* RFC Section 1.4 Key Terms 1192 * 1193 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1194 * multi-homed host, an SCTP endpoint is represented to its peers as a 1195 * combination of a set of eligible destination transport addresses to 1196 * which SCTP packets can be sent and a set of eligible source 1197 * transport addresses from which SCTP packets can be received. 1198 * All transport addresses used by an SCTP endpoint must use the 1199 * same port number, but can use multiple IP addresses. A transport 1200 * address used by an SCTP endpoint must not be used by another 1201 * SCTP endpoint. In other words, a transport address is unique 1202 * to an SCTP endpoint. 1203 * 1204 * From an implementation perspective, each socket has one of these. 1205 * A TCP-style socket will have exactly one association on one of 1206 * these. An UDP-style socket will have multiple associations hanging 1207 * off one of these. 1208 */ 1209 1210 struct sctp_endpoint { 1211 /* Common substructure for endpoint and association. */ 1212 struct sctp_ep_common base; 1213 1214 /* Associations: A list of current associations and mappings 1215 * to the data consumers for each association. This 1216 * may be in the form of a hash table or other 1217 * implementation dependent structure. The data 1218 * consumers may be process identification 1219 * information such as file descriptors, named pipe 1220 * pointer, or table pointers dependent on how SCTP 1221 * is implemented. 1222 */ 1223 /* This is really a list of struct sctp_association entries. */ 1224 struct list_head asocs; 1225 1226 /* Secret Key: A secret key used by this endpoint to compute 1227 * the MAC. This SHOULD be a cryptographic quality 1228 * random number with a sufficient length. 1229 * Discussion in [RFC1750] can be helpful in 1230 * selection of the key. 1231 */ 1232 __u8 secret_key[SCTP_SECRET_SIZE]; 1233 1234 /* digest: This is a digest of the sctp cookie. This field is 1235 * only used on the receive path when we try to validate 1236 * that the cookie has not been tampered with. We put 1237 * this here so we pre-allocate this once and can re-use 1238 * on every receive. 1239 */ 1240 __u8 *digest; 1241 1242 /* sendbuf acct. policy. */ 1243 __u32 sndbuf_policy; 1244 1245 /* rcvbuf acct. policy. */ 1246 __u32 rcvbuf_policy; 1247 1248 /* SCTP AUTH: array of the HMACs that will be allocated 1249 * we need this per association so that we don't serialize 1250 */ 1251 struct crypto_shash **auth_hmacs; 1252 1253 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1254 struct sctp_hmac_algo_param *auth_hmacs_list; 1255 1256 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1257 struct sctp_chunks_param *auth_chunk_list; 1258 1259 /* SCTP-AUTH: endpoint shared keys */ 1260 struct list_head endpoint_shared_keys; 1261 __u16 active_key_id; 1262 __u8 auth_enable:1, 1263 prsctp_enable:1, 1264 reconf_enable:1; 1265 1266 __u8 strreset_enable; 1267 }; 1268 1269 /* Recover the outter endpoint structure. */ 1270 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1271 { 1272 struct sctp_endpoint *ep; 1273 1274 ep = container_of(base, struct sctp_endpoint, base); 1275 return ep; 1276 } 1277 1278 /* These are function signatures for manipulating endpoints. */ 1279 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1280 void sctp_endpoint_free(struct sctp_endpoint *); 1281 void sctp_endpoint_put(struct sctp_endpoint *); 1282 void sctp_endpoint_hold(struct sctp_endpoint *); 1283 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1284 struct sctp_association *sctp_endpoint_lookup_assoc( 1285 const struct sctp_endpoint *ep, 1286 const union sctp_addr *paddr, 1287 struct sctp_transport **); 1288 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1289 const union sctp_addr *); 1290 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1291 struct net *, const union sctp_addr *); 1292 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1293 const union sctp_addr *paddr); 1294 1295 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1296 const struct sctp_association *asoc, 1297 sctp_cid_t, sctp_init_chunk_t *peer_init, 1298 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1299 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1300 const union sctp_addr *peer, 1301 sctp_init_chunk_t *init, gfp_t gfp); 1302 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1303 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1304 1305 struct sctp_inithdr_host { 1306 __u32 init_tag; 1307 __u32 a_rwnd; 1308 __u16 num_outbound_streams; 1309 __u16 num_inbound_streams; 1310 __u32 initial_tsn; 1311 }; 1312 1313 struct sctp_stream_out { 1314 __u16 ssn; 1315 __u8 state; 1316 }; 1317 1318 struct sctp_stream_in { 1319 __u16 ssn; 1320 }; 1321 1322 struct sctp_stream { 1323 struct sctp_stream_out *out; 1324 struct sctp_stream_in *in; 1325 __u16 outcnt; 1326 __u16 incnt; 1327 }; 1328 1329 #define SCTP_STREAM_CLOSED 0x00 1330 #define SCTP_STREAM_OPEN 0x01 1331 1332 /* SCTP_GET_ASSOC_STATS counters */ 1333 struct sctp_priv_assoc_stats { 1334 /* Maximum observed rto in the association during subsequent 1335 * observations. Value is set to 0 if no RTO measurement took place 1336 * The transport where the max_rto was observed is returned in 1337 * obs_rto_ipaddr 1338 */ 1339 struct sockaddr_storage obs_rto_ipaddr; 1340 __u64 max_obs_rto; 1341 /* Total In and Out SACKs received and sent */ 1342 __u64 isacks; 1343 __u64 osacks; 1344 /* Total In and Out packets received and sent */ 1345 __u64 opackets; 1346 __u64 ipackets; 1347 /* Total retransmitted chunks */ 1348 __u64 rtxchunks; 1349 /* TSN received > next expected */ 1350 __u64 outofseqtsns; 1351 /* Duplicate Chunks received */ 1352 __u64 idupchunks; 1353 /* Gap Ack Blocks received */ 1354 __u64 gapcnt; 1355 /* Unordered data chunks sent and received */ 1356 __u64 ouodchunks; 1357 __u64 iuodchunks; 1358 /* Ordered data chunks sent and received */ 1359 __u64 oodchunks; 1360 __u64 iodchunks; 1361 /* Control chunks sent and received */ 1362 __u64 octrlchunks; 1363 __u64 ictrlchunks; 1364 }; 1365 1366 /* RFC2960 1367 * 1368 * 12. Recommended Transmission Control Block (TCB) Parameters 1369 * 1370 * This section details a recommended set of parameters that should 1371 * be contained within the TCB for an implementation. This section is 1372 * for illustrative purposes and should not be deemed as requirements 1373 * on an implementation or as an exhaustive list of all parameters 1374 * inside an SCTP TCB. Each implementation may need its own additional 1375 * parameters for optimization. 1376 */ 1377 1378 1379 /* Here we have information about each individual association. */ 1380 struct sctp_association { 1381 1382 /* A base structure common to endpoint and association. 1383 * In this context, it represents the associations's view 1384 * of the local endpoint of the association. 1385 */ 1386 struct sctp_ep_common base; 1387 1388 /* Associations on the same socket. */ 1389 struct list_head asocs; 1390 1391 /* association id. */ 1392 sctp_assoc_t assoc_id; 1393 1394 /* This is our parent endpoint. */ 1395 struct sctp_endpoint *ep; 1396 1397 /* These are those association elements needed in the cookie. */ 1398 struct sctp_cookie c; 1399 1400 /* This is all information about our peer. */ 1401 struct { 1402 /* transport_addr_list 1403 * 1404 * Peer : A list of SCTP transport addresses that the 1405 * Transport : peer is bound to. This information is derived 1406 * Address : from the INIT or INIT ACK and is used to 1407 * List : associate an inbound packet with a given 1408 * : association. Normally this information is 1409 * : hashed or keyed for quick lookup and access 1410 * : of the TCB. 1411 * : The list is also initialized with the list 1412 * : of addresses passed with the sctp_connectx() 1413 * : call. 1414 * 1415 * It is a list of SCTP_transport's. 1416 */ 1417 struct list_head transport_addr_list; 1418 1419 /* rwnd 1420 * 1421 * Peer Rwnd : Current calculated value of the peer's rwnd. 1422 */ 1423 __u32 rwnd; 1424 1425 /* transport_count 1426 * 1427 * Peer : A count of the number of peer addresses 1428 * Transport : in the Peer Transport Address List. 1429 * Address : 1430 * Count : 1431 */ 1432 __u16 transport_count; 1433 1434 /* port 1435 * The transport layer port number. 1436 */ 1437 __u16 port; 1438 1439 /* primary_path 1440 * 1441 * Primary : This is the current primary destination 1442 * Path : transport address of the peer endpoint. It 1443 * : may also specify a source transport address 1444 * : on this endpoint. 1445 * 1446 * All of these paths live on transport_addr_list. 1447 * 1448 * At the bakeoffs, we discovered that the intent of 1449 * primaryPath is that it only changes when the ULP 1450 * asks to have it changed. We add the activePath to 1451 * designate the connection we are currently using to 1452 * transmit new data and most control chunks. 1453 */ 1454 struct sctp_transport *primary_path; 1455 1456 /* Cache the primary path address here, when we 1457 * need a an address for msg_name. 1458 */ 1459 union sctp_addr primary_addr; 1460 1461 /* active_path 1462 * The path that we are currently using to 1463 * transmit new data and most control chunks. 1464 */ 1465 struct sctp_transport *active_path; 1466 1467 /* retran_path 1468 * 1469 * RFC2960 6.4 Multi-homed SCTP Endpoints 1470 * ... 1471 * Furthermore, when its peer is multi-homed, an 1472 * endpoint SHOULD try to retransmit a chunk to an 1473 * active destination transport address that is 1474 * different from the last destination address to 1475 * which the DATA chunk was sent. 1476 */ 1477 struct sctp_transport *retran_path; 1478 1479 /* Pointer to last transport I have sent on. */ 1480 struct sctp_transport *last_sent_to; 1481 1482 /* This is the last transport I have received DATA on. */ 1483 struct sctp_transport *last_data_from; 1484 1485 /* 1486 * Mapping An array of bits or bytes indicating which out of 1487 * Array order TSN's have been received (relative to the 1488 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1489 * order packets have been received, this array 1490 * will be set to all zero. This structure may be 1491 * in the form of a circular buffer or bit array. 1492 * 1493 * Last Rcvd : This is the last TSN received in 1494 * TSN : sequence. This value is set initially by 1495 * : taking the peer's Initial TSN, received in 1496 * : the INIT or INIT ACK chunk, and subtracting 1497 * : one from it. 1498 * 1499 * Throughout most of the specification this is called the 1500 * "Cumulative TSN ACK Point". In this case, we 1501 * ignore the advice in 12.2 in favour of the term 1502 * used in the bulk of the text. This value is hidden 1503 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1504 */ 1505 struct sctp_tsnmap tsn_map; 1506 1507 /* This mask is used to disable sending the ASCONF chunk 1508 * with specified parameter to peer. 1509 */ 1510 __be16 addip_disabled_mask; 1511 1512 /* These are capabilities which our peer advertised. */ 1513 __u8 ecn_capable:1, /* Can peer do ECN? */ 1514 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1515 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1516 hostname_address:1, /* Peer understands DNS addresses? */ 1517 asconf_capable:1, /* Does peer support ADDIP? */ 1518 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1519 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1520 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1521 1522 /* sack_needed : This flag indicates if the next received 1523 * : packet is to be responded to with a 1524 * : SACK. This is initialized to 0. When a packet 1525 * : is received sack_cnt is incremented. If this value 1526 * : reaches 2 or more, a SACK is sent and the 1527 * : value is reset to 0. Note: This is used only 1528 * : when no DATA chunks are received out of 1529 * : order. When DATA chunks are out of order, 1530 * : SACK's are not delayed (see Section 6). 1531 */ 1532 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1533 sack_generation:1, 1534 zero_window_announced:1; 1535 __u32 sack_cnt; 1536 1537 __u32 adaptation_ind; /* Adaptation Code point. */ 1538 1539 struct sctp_inithdr_host i; 1540 void *cookie; 1541 int cookie_len; 1542 1543 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1544 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1545 * Initial TSN Value minus 1 1546 */ 1547 __u32 addip_serial; 1548 1549 /* SCTP-AUTH: We need to know pears random number, hmac list 1550 * and authenticated chunk list. All that is part of the 1551 * cookie and these are just pointers to those locations 1552 */ 1553 sctp_random_param_t *peer_random; 1554 sctp_chunks_param_t *peer_chunks; 1555 sctp_hmac_algo_param_t *peer_hmacs; 1556 } peer; 1557 1558 /* State : A state variable indicating what state the 1559 * : association is in, i.e. COOKIE-WAIT, 1560 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1561 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1562 * 1563 * Note: No "CLOSED" state is illustrated since if a 1564 * association is "CLOSED" its TCB SHOULD be removed. 1565 * 1566 * In this implementation we DO have a CLOSED 1567 * state which is used during initiation and shutdown. 1568 * 1569 * State takes values from SCTP_STATE_*. 1570 */ 1571 sctp_state_t state; 1572 1573 /* Overall : The overall association error count. 1574 * Error Count : [Clear this any time I get something.] 1575 */ 1576 int overall_error_count; 1577 1578 /* The cookie life I award for any cookie. */ 1579 ktime_t cookie_life; 1580 1581 /* These are the association's initial, max, and min RTO values. 1582 * These values will be initialized by system defaults, but can 1583 * be modified via the SCTP_RTOINFO socket option. 1584 */ 1585 unsigned long rto_initial; 1586 unsigned long rto_max; 1587 unsigned long rto_min; 1588 1589 /* Maximum number of new data packets that can be sent in a burst. */ 1590 int max_burst; 1591 1592 /* This is the max_retrans value for the association. This value will 1593 * be initialized initialized from system defaults, but can be 1594 * modified by the SCTP_ASSOCINFO socket option. 1595 */ 1596 int max_retrans; 1597 1598 /* This is the partially failed retrans value for the transport 1599 * and will be initialized from the assocs value. This can be 1600 * changed using the SCTP_PEER_ADDR_THLDS socket option 1601 */ 1602 int pf_retrans; 1603 1604 /* Maximum number of times the endpoint will retransmit INIT */ 1605 __u16 max_init_attempts; 1606 1607 /* How many times have we resent an INIT? */ 1608 __u16 init_retries; 1609 1610 /* The largest timeout or RTO value to use in attempting an INIT */ 1611 unsigned long max_init_timeo; 1612 1613 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1614 * the destination address every heartbeat interval. This value 1615 * will be inherited by all new transports. 1616 */ 1617 unsigned long hbinterval; 1618 1619 /* This is the max_retrans value for new transports in the 1620 * association. 1621 */ 1622 __u16 pathmaxrxt; 1623 1624 /* Flag that path mtu update is pending */ 1625 __u8 pmtu_pending; 1626 1627 /* Association : The smallest PMTU discovered for all of the 1628 * PMTU : peer's transport addresses. 1629 */ 1630 __u32 pathmtu; 1631 1632 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1633 __u32 param_flags; 1634 1635 __u32 sackfreq; 1636 /* SACK delay timeout */ 1637 unsigned long sackdelay; 1638 1639 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1640 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1641 1642 /* Transport to which SHUTDOWN chunk was last sent. */ 1643 struct sctp_transport *shutdown_last_sent_to; 1644 1645 /* Transport to which INIT chunk was last sent. */ 1646 struct sctp_transport *init_last_sent_to; 1647 1648 /* How many times have we resent a SHUTDOWN */ 1649 int shutdown_retries; 1650 1651 /* Next TSN : The next TSN number to be assigned to a new 1652 * : DATA chunk. This is sent in the INIT or INIT 1653 * : ACK chunk to the peer and incremented each 1654 * : time a DATA chunk is assigned a TSN 1655 * : (normally just prior to transmit or during 1656 * : fragmentation). 1657 */ 1658 __u32 next_tsn; 1659 1660 /* 1661 * Last Rcvd : This is the last TSN received in sequence. This value 1662 * TSN : is set initially by taking the peer's Initial TSN, 1663 * : received in the INIT or INIT ACK chunk, and 1664 * : subtracting one from it. 1665 * 1666 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1667 */ 1668 1669 __u32 ctsn_ack_point; 1670 1671 /* PR-SCTP Advanced.Peer.Ack.Point */ 1672 __u32 adv_peer_ack_point; 1673 1674 /* Highest TSN that is acknowledged by incoming SACKs. */ 1675 __u32 highest_sacked; 1676 1677 /* TSN marking the fast recovery exit point */ 1678 __u32 fast_recovery_exit; 1679 1680 /* Flag to track the current fast recovery state */ 1681 __u8 fast_recovery; 1682 1683 /* The number of unacknowledged data chunks. Reported through 1684 * the SCTP_STATUS sockopt. 1685 */ 1686 __u16 unack_data; 1687 1688 /* The total number of data chunks that we've had to retransmit 1689 * as the result of a T3 timer expiration 1690 */ 1691 __u32 rtx_data_chunks; 1692 1693 /* This is the association's receive buffer space. This value is used 1694 * to set a_rwnd field in an INIT or a SACK chunk. 1695 */ 1696 __u32 rwnd; 1697 1698 /* This is the last advertised value of rwnd over a SACK chunk. */ 1699 __u32 a_rwnd; 1700 1701 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1702 * to slop over a maximum of the association's frag_point. 1703 */ 1704 __u32 rwnd_over; 1705 1706 /* Keeps treack of rwnd pressure. This happens when we have 1707 * a window, but not recevie buffer (i.e small packets). This one 1708 * is releases slowly (1 PMTU at a time ). 1709 */ 1710 __u32 rwnd_press; 1711 1712 /* This is the sndbuf size in use for the association. 1713 * This corresponds to the sndbuf size for the association, 1714 * as specified in the sk->sndbuf. 1715 */ 1716 int sndbuf_used; 1717 1718 /* This is the amount of memory that this association has allocated 1719 * in the receive path at any given time. 1720 */ 1721 atomic_t rmem_alloc; 1722 1723 /* This is the wait queue head for send requests waiting on 1724 * the association sndbuf space. 1725 */ 1726 wait_queue_head_t wait; 1727 1728 /* The message size at which SCTP fragmentation will occur. */ 1729 __u32 frag_point; 1730 __u32 user_frag; 1731 1732 /* Counter used to count INIT errors. */ 1733 int init_err_counter; 1734 1735 /* Count the number of INIT cycles (for doubling timeout). */ 1736 int init_cycle; 1737 1738 /* Default send parameters. */ 1739 __u16 default_stream; 1740 __u16 default_flags; 1741 __u32 default_ppid; 1742 __u32 default_context; 1743 __u32 default_timetolive; 1744 1745 /* Default receive parameters */ 1746 __u32 default_rcv_context; 1747 1748 /* Stream arrays */ 1749 struct sctp_stream *stream; 1750 1751 /* All outbound chunks go through this structure. */ 1752 struct sctp_outq outqueue; 1753 1754 /* A smart pipe that will handle reordering and fragmentation, 1755 * as well as handle passing events up to the ULP. 1756 */ 1757 struct sctp_ulpq ulpq; 1758 1759 /* Last TSN that caused an ECNE Chunk to be sent. */ 1760 __u32 last_ecne_tsn; 1761 1762 /* Last TSN that caused a CWR Chunk to be sent. */ 1763 __u32 last_cwr_tsn; 1764 1765 /* How many duplicated TSNs have we seen? */ 1766 int numduptsns; 1767 1768 /* These are to support 1769 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1770 * and Enforcement of Flow and Message Limits" 1771 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1772 * or "ADDIP" for short. 1773 */ 1774 1775 1776 1777 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1778 * 1779 * R1) One and only one ASCONF Chunk MAY be in transit and 1780 * unacknowledged at any one time. If a sender, after sending 1781 * an ASCONF chunk, decides it needs to transfer another 1782 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1783 * returns from the previous ASCONF Chunk before sending a 1784 * subsequent ASCONF. Note this restriction binds each side, 1785 * so at any time two ASCONF may be in-transit on any given 1786 * association (one sent from each endpoint). 1787 * 1788 * [This is our one-and-only-one ASCONF in flight. If we do 1789 * not have an ASCONF in flight, this is NULL.] 1790 */ 1791 struct sctp_chunk *addip_last_asconf; 1792 1793 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1794 * 1795 * This is needed to implement itmes E1 - E4 of the updated 1796 * spec. Here is the justification: 1797 * 1798 * Since the peer may bundle multiple ASCONF chunks toward us, 1799 * we now need the ability to cache multiple ACKs. The section 1800 * describes in detail how they are cached and cleaned up. 1801 */ 1802 struct list_head asconf_ack_list; 1803 1804 /* These ASCONF chunks are waiting to be sent. 1805 * 1806 * These chunaks can't be pushed to outqueue until receiving 1807 * ASCONF_ACK for the previous ASCONF indicated by 1808 * addip_last_asconf, so as to guarantee that only one ASCONF 1809 * is in flight at any time. 1810 * 1811 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1812 * 1813 * In defining the ASCONF Chunk transfer procedures, it is 1814 * essential that these transfers MUST NOT cause congestion 1815 * within the network. To achieve this, we place these 1816 * restrictions on the transfer of ASCONF Chunks: 1817 * 1818 * R1) One and only one ASCONF Chunk MAY be in transit and 1819 * unacknowledged at any one time. If a sender, after sending 1820 * an ASCONF chunk, decides it needs to transfer another 1821 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1822 * returns from the previous ASCONF Chunk before sending a 1823 * subsequent ASCONF. Note this restriction binds each side, 1824 * so at any time two ASCONF may be in-transit on any given 1825 * association (one sent from each endpoint). 1826 * 1827 * 1828 * [I really think this is EXACTLY the sort of intelligence 1829 * which already resides in sctp_outq. Please move this 1830 * queue and its supporting logic down there. --piggy] 1831 */ 1832 struct list_head addip_chunk_list; 1833 1834 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1835 * 1836 * A2) A serial number should be assigned to the Chunk. The 1837 * serial number SHOULD be a monotonically increasing 1838 * number. The serial number SHOULD be initialized at 1839 * the start of the association to the same value as the 1840 * Initial TSN and every time a new ASCONF chunk is created 1841 * it is incremented by one after assigning the serial number 1842 * to the newly created chunk. 1843 * 1844 * ADDIP 1845 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1846 * 1847 * Serial Number : 32 bits (unsigned integer) 1848 * 1849 * This value represents a Serial Number for the ASCONF 1850 * Chunk. The valid range of Serial Number is from 0 to 1851 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1852 * after reaching 4294967295. 1853 */ 1854 __u32 addip_serial; 1855 int src_out_of_asoc_ok; 1856 union sctp_addr *asconf_addr_del_pending; 1857 struct sctp_transport *new_transport; 1858 1859 /* SCTP AUTH: list of the endpoint shared keys. These 1860 * keys are provided out of band by the user applicaton 1861 * and can't change during the lifetime of the association 1862 */ 1863 struct list_head endpoint_shared_keys; 1864 1865 /* SCTP AUTH: 1866 * The current generated assocaition shared key (secret) 1867 */ 1868 struct sctp_auth_bytes *asoc_shared_key; 1869 1870 /* SCTP AUTH: hmac id of the first peer requested algorithm 1871 * that we support. 1872 */ 1873 __u16 default_hmac_id; 1874 1875 __u16 active_key_id; 1876 1877 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1878 temp:1, /* Is it a temporary association? */ 1879 prsctp_enable:1, 1880 reconf_enable:1; 1881 1882 __u8 strreset_enable; 1883 __u8 strreset_outstanding; /* request param count on the fly */ 1884 1885 __u32 strreset_outseq; /* Update after receiving response */ 1886 __u32 strreset_inseq; /* Update after receiving request */ 1887 1888 struct sctp_chunk *strreset_chunk; /* save request chunk */ 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