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