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 } __packed 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 can_delay; /* should this message be Nagle delayed */ 501 }; 502 503 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 504 struct sctp_sndrcvinfo *, 505 struct iov_iter *); 506 void sctp_datamsg_free(struct sctp_datamsg *); 507 void sctp_datamsg_put(struct sctp_datamsg *); 508 void sctp_chunk_fail(struct sctp_chunk *, int error); 509 int sctp_chunk_abandoned(struct sctp_chunk *); 510 511 /* RFC2960 1.4 Key Terms 512 * 513 * o Chunk: A unit of information within an SCTP packet, consisting of 514 * a chunk header and chunk-specific content. 515 * 516 * As a matter of convenience, we remember the SCTP common header for 517 * each chunk as well as a few other header pointers... 518 */ 519 struct sctp_chunk { 520 struct list_head list; 521 522 atomic_t refcnt; 523 524 /* How many times this chunk have been sent, for prsctp RTX policy */ 525 int sent_count; 526 527 /* This is our link to the per-transport transmitted list. */ 528 struct list_head transmitted_list; 529 530 /* This field is used by chunks that hold fragmented data. 531 * For the first fragment this is the list that holds the rest of 532 * fragments. For the remaining fragments, this is the link to the 533 * frag_list maintained in the first fragment. 534 */ 535 struct list_head frag_list; 536 537 /* This points to the sk_buff containing the actual data. */ 538 struct sk_buff *skb; 539 540 /* In case of GSO packets, this will store the head one */ 541 struct sk_buff *head_skb; 542 543 /* These are the SCTP headers by reverse order in a packet. 544 * Note that some of these may happen more than once. In that 545 * case, we point at the "current" one, whatever that means 546 * for that level of header. 547 */ 548 549 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 550 union sctp_params param_hdr; 551 union { 552 __u8 *v; 553 struct sctp_datahdr *data_hdr; 554 struct sctp_inithdr *init_hdr; 555 struct sctp_sackhdr *sack_hdr; 556 struct sctp_heartbeathdr *hb_hdr; 557 struct sctp_sender_hb_info *hbs_hdr; 558 struct sctp_shutdownhdr *shutdown_hdr; 559 struct sctp_signed_cookie *cookie_hdr; 560 struct sctp_ecnehdr *ecne_hdr; 561 struct sctp_cwrhdr *ecn_cwr_hdr; 562 struct sctp_errhdr *err_hdr; 563 struct sctp_addiphdr *addip_hdr; 564 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 565 struct sctp_authhdr *auth_hdr; 566 } subh; 567 568 __u8 *chunk_end; 569 570 struct sctp_chunkhdr *chunk_hdr; 571 struct sctphdr *sctp_hdr; 572 573 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 574 struct sctp_sndrcvinfo sinfo; 575 576 /* Which association does this belong to? */ 577 struct sctp_association *asoc; 578 579 /* What endpoint received this chunk? */ 580 struct sctp_ep_common *rcvr; 581 582 /* We fill this in if we are calculating RTT. */ 583 unsigned long sent_at; 584 585 /* What is the origin IP address for this chunk? */ 586 union sctp_addr source; 587 /* Destination address for this chunk. */ 588 union sctp_addr dest; 589 590 /* For outbound message, track all fragments for SEND_FAILED. */ 591 struct sctp_datamsg *msg; 592 593 /* For an inbound chunk, this tells us where it came from. 594 * For an outbound chunk, it tells us where we'd like it to 595 * go. It is NULL if we have no preference. 596 */ 597 struct sctp_transport *transport; 598 599 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 600 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 601 * spec violates the principle premis that all chunks are processed 602 * in order. 603 */ 604 struct sk_buff *auth_chunk; 605 606 #define SCTP_CAN_FRTX 0x0 607 #define SCTP_NEED_FRTX 0x1 608 #define SCTP_DONT_FRTX 0x2 609 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 610 has_tsn:1, /* Does this chunk have a TSN yet? */ 611 has_ssn:1, /* Does this chunk have a SSN yet? */ 612 singleton:1, /* Only chunk in the packet? */ 613 end_of_packet:1, /* Last chunk in the packet? */ 614 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 615 pdiscard:1, /* Discard the whole packet now? */ 616 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 617 data_accepted:1, /* At least 1 chunk accepted */ 618 auth:1, /* IN: was auth'ed | OUT: needs auth */ 619 has_asconf:1, /* IN: have seen an asconf before */ 620 tsn_missing_report:2, /* Data chunk missing counter. */ 621 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 622 }; 623 624 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 625 void sctp_chunk_hold(struct sctp_chunk *); 626 void sctp_chunk_put(struct sctp_chunk *); 627 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 628 struct iov_iter *from); 629 void sctp_chunk_free(struct sctp_chunk *); 630 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 631 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 632 const struct sctp_association *, 633 struct sock *, gfp_t gfp); 634 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 635 union sctp_addr *); 636 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 637 638 enum { 639 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 640 SCTP_ADDR_SRC, /* address can be used as source */ 641 SCTP_ADDR_DEL, /* address about to be deleted */ 642 }; 643 644 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 645 struct sctp_sockaddr_entry { 646 struct list_head list; 647 struct rcu_head rcu; 648 union sctp_addr a; 649 __u8 state; 650 __u8 valid; 651 }; 652 653 #define SCTP_ADDRESS_TICK_DELAY 500 654 655 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 656 657 /* This structure holds lists of chunks as we are assembling for 658 * transmission. 659 */ 660 struct sctp_packet { 661 /* These are the SCTP header values (host order) for the packet. */ 662 __u16 source_port; 663 __u16 destination_port; 664 __u32 vtag; 665 666 /* This contains the payload chunks. */ 667 struct list_head chunk_list; 668 669 /* This is the overhead of the sctp and ip headers. */ 670 size_t overhead; 671 /* This is the total size of all chunks INCLUDING padding. */ 672 size_t size; 673 /* This is the maximum size this packet may have */ 674 size_t max_size; 675 676 /* The packet is destined for this transport address. 677 * The function we finally use to pass down to the next lower 678 * layer lives in the transport structure. 679 */ 680 struct sctp_transport *transport; 681 682 /* pointer to the auth chunk for this packet */ 683 struct sctp_chunk *auth; 684 685 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 686 has_sack:1, /* This packet contains a SACK chunk. */ 687 has_auth:1, /* This packet contains an AUTH chunk */ 688 has_data:1, /* This packet contains at least 1 DATA chunk */ 689 ipfragok:1; /* So let ip fragment this packet */ 690 }; 691 692 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 693 __u16 sport, __u16 dport); 694 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 695 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 696 struct sctp_chunk *, int, gfp_t); 697 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 698 struct sctp_chunk *); 699 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 700 void sctp_packet_free(struct sctp_packet *); 701 702 static inline int sctp_packet_empty(struct sctp_packet *packet) 703 { 704 return packet->size == packet->overhead; 705 } 706 707 /* This represents a remote transport address. 708 * For local transport addresses, we just use union sctp_addr. 709 * 710 * RFC2960 Section 1.4 Key Terms 711 * 712 * o Transport address: A Transport Address is traditionally defined 713 * by Network Layer address, Transport Layer protocol and Transport 714 * Layer port number. In the case of SCTP running over IP, a 715 * transport address is defined by the combination of an IP address 716 * and an SCTP port number (where SCTP is the Transport protocol). 717 * 718 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 719 * 720 * o The sender keeps a separate congestion control parameter set for 721 * each of the destination addresses it can send to (not each 722 * source-destination pair but for each destination). The parameters 723 * should decay if the address is not used for a long enough time 724 * period. 725 * 726 */ 727 struct sctp_transport { 728 /* A list of transports. */ 729 struct list_head transports; 730 struct rhlist_head node; 731 732 /* Reference counting. */ 733 atomic_t refcnt; 734 /* RTO-Pending : A flag used to track if one of the DATA 735 * chunks sent to this address is currently being 736 * used to compute a RTT. If this flag is 0, 737 * the next DATA chunk sent to this destination 738 * should be used to compute a RTT and this flag 739 * should be set. Every time the RTT 740 * calculation completes (i.e. the DATA chunk 741 * is SACK'd) clear this flag. 742 */ 743 __u32 rto_pending:1, 744 745 /* 746 * hb_sent : a flag that signals that we have a pending 747 * heartbeat. 748 */ 749 hb_sent:1, 750 751 /* Is the Path MTU update pending on this tranport */ 752 pmtu_pending:1, 753 754 /* Has this transport moved the ctsn since we last sacked */ 755 sack_generation:1; 756 u32 dst_cookie; 757 758 struct flowi fl; 759 760 /* This is the peer's IP address and port. */ 761 union sctp_addr ipaddr; 762 763 /* These are the functions we call to handle LLP stuff. */ 764 struct sctp_af *af_specific; 765 766 /* Which association do we belong to? */ 767 struct sctp_association *asoc; 768 769 /* RFC2960 770 * 771 * 12.3 Per Transport Address Data 772 * 773 * For each destination transport address in the peer's 774 * address list derived from the INIT or INIT ACK chunk, a 775 * number of data elements needs to be maintained including: 776 */ 777 /* RTO : The current retransmission timeout value. */ 778 unsigned long rto; 779 780 __u32 rtt; /* This is the most recent RTT. */ 781 782 /* RTTVAR : The current RTT variation. */ 783 __u32 rttvar; 784 785 /* SRTT : The current smoothed round trip time. */ 786 __u32 srtt; 787 788 /* 789 * These are the congestion stats. 790 */ 791 /* cwnd : The current congestion window. */ 792 __u32 cwnd; /* This is the actual cwnd. */ 793 794 /* ssthresh : The current slow start threshold value. */ 795 __u32 ssthresh; 796 797 /* partial : The tracking method for increase of cwnd when in 798 * bytes acked : congestion avoidance mode (see Section 6.2.2) 799 */ 800 __u32 partial_bytes_acked; 801 802 /* Data that has been sent, but not acknowledged. */ 803 __u32 flight_size; 804 805 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 806 807 /* Destination */ 808 struct dst_entry *dst; 809 /* Source address. */ 810 union sctp_addr saddr; 811 812 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 813 * the destination address every heartbeat interval. 814 */ 815 unsigned long hbinterval; 816 817 /* SACK delay timeout */ 818 unsigned long sackdelay; 819 __u32 sackfreq; 820 821 /* When was the last time that we heard from this transport? We use 822 * this to pick new active and retran paths. 823 */ 824 ktime_t last_time_heard; 825 826 /* When was the last time that we sent a chunk using this 827 * transport? We use this to check for idle transports 828 */ 829 unsigned long last_time_sent; 830 831 /* Last time(in jiffies) when cwnd is reduced due to the congestion 832 * indication based on ECNE chunk. 833 */ 834 unsigned long last_time_ecne_reduced; 835 836 /* This is the max_retrans value for the transport and will 837 * be initialized from the assocs value. This can be changed 838 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 839 */ 840 __u16 pathmaxrxt; 841 842 /* This is the partially failed retrans value for the transport 843 * and will be initialized from the assocs value. This can be changed 844 * using the SCTP_PEER_ADDR_THLDS socket option 845 */ 846 int pf_retrans; 847 /* PMTU : The current known path MTU. */ 848 __u32 pathmtu; 849 850 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 851 __u32 param_flags; 852 853 /* The number of times INIT has been sent on this transport. */ 854 int init_sent_count; 855 856 /* state : The current state of this destination, 857 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 858 */ 859 int state; 860 861 /* These are the error stats for this destination. */ 862 863 /* Error count : The current error count for this destination. */ 864 unsigned short error_count; 865 866 /* Per : A timer used by each destination. 867 * Destination : 868 * Timer : 869 * 870 * [Everywhere else in the text this is called T3-rtx. -ed] 871 */ 872 struct timer_list T3_rtx_timer; 873 874 /* Heartbeat timer is per destination. */ 875 struct timer_list hb_timer; 876 877 /* Timer to handle ICMP proto unreachable envets */ 878 struct timer_list proto_unreach_timer; 879 880 /* Since we're using per-destination retransmission timers 881 * (see above), we're also using per-destination "transmitted" 882 * queues. This probably ought to be a private struct 883 * accessible only within the outqueue, but it's not, yet. 884 */ 885 struct list_head transmitted; 886 887 /* We build bundle-able packets for this transport here. */ 888 struct sctp_packet packet; 889 890 /* This is the list of transports that have chunks to send. */ 891 struct list_head send_ready; 892 893 /* State information saved for SFR_CACC algorithm. The key 894 * idea in SFR_CACC is to maintain state at the sender on a 895 * per-destination basis when a changeover happens. 896 * char changeover_active; 897 * char cycling_changeover; 898 * __u32 next_tsn_at_change; 899 * char cacc_saw_newack; 900 */ 901 struct { 902 /* An unsigned integer, which stores the next TSN to be 903 * used by the sender, at the moment of changeover. 904 */ 905 __u32 next_tsn_at_change; 906 907 /* A flag which indicates the occurrence of a changeover */ 908 char changeover_active; 909 910 /* A flag which indicates whether the change of primary is 911 * the first switch to this destination address during an 912 * active switch. 913 */ 914 char cycling_changeover; 915 916 /* A temporary flag, which is used during the processing of 917 * a SACK to estimate the causative TSN(s)'s group. 918 */ 919 char cacc_saw_newack; 920 } cacc; 921 922 /* 64-bit random number sent with heartbeat. */ 923 __u64 hb_nonce; 924 925 struct rcu_head rcu; 926 }; 927 928 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 929 gfp_t); 930 void sctp_transport_set_owner(struct sctp_transport *, 931 struct sctp_association *); 932 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 933 struct sctp_sock *); 934 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 935 void sctp_transport_free(struct sctp_transport *); 936 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 937 void sctp_transport_reset_hb_timer(struct sctp_transport *); 938 int sctp_transport_hold(struct sctp_transport *); 939 void sctp_transport_put(struct sctp_transport *); 940 void sctp_transport_update_rto(struct sctp_transport *, __u32); 941 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 942 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 943 void sctp_transport_burst_limited(struct sctp_transport *); 944 void sctp_transport_burst_reset(struct sctp_transport *); 945 unsigned long sctp_transport_timeout(struct sctp_transport *); 946 void sctp_transport_reset(struct sctp_transport *); 947 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); 948 void sctp_transport_immediate_rtx(struct sctp_transport *); 949 950 951 /* This is the structure we use to queue packets as they come into 952 * SCTP. We write packets to it and read chunks from it. 953 */ 954 struct sctp_inq { 955 /* This is actually a queue of sctp_chunk each 956 * containing a partially decoded packet. 957 */ 958 struct list_head in_chunk_list; 959 /* This is the packet which is currently off the in queue and is 960 * being worked on through the inbound chunk processing. 961 */ 962 struct sctp_chunk *in_progress; 963 964 /* This is the delayed task to finish delivering inbound 965 * messages. 966 */ 967 struct work_struct immediate; 968 }; 969 970 void sctp_inq_init(struct sctp_inq *); 971 void sctp_inq_free(struct sctp_inq *); 972 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 973 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 974 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 975 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 976 977 /* This is the structure we use to hold outbound chunks. You push 978 * chunks in and they automatically pop out the other end as bundled 979 * packets (it calls (*output_handler)()). 980 * 981 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 982 * and 8.2 of the v13 draft. 983 * 984 * It handles retransmissions. The connection to the timeout portion 985 * of the state machine is through sctp_..._timeout() and timeout_handler. 986 * 987 * If you feed it SACKs, it will eat them. 988 * 989 * If you give it big chunks, it will fragment them. 990 * 991 * It assigns TSN's to data chunks. This happens at the last possible 992 * instant before transmission. 993 * 994 * When free()'d, it empties itself out via output_handler(). 995 */ 996 struct sctp_outq { 997 struct sctp_association *asoc; 998 999 /* Data pending that has never been transmitted. */ 1000 struct list_head out_chunk_list; 1001 1002 unsigned int out_qlen; /* Total length of queued data chunks. */ 1003 1004 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1005 unsigned int error; 1006 1007 /* These are control chunks we want to send. */ 1008 struct list_head control_chunk_list; 1009 1010 /* These are chunks that have been sacked but are above the 1011 * CTSN, or cumulative tsn ack point. 1012 */ 1013 struct list_head sacked; 1014 1015 /* Put chunks on this list to schedule them for 1016 * retransmission. 1017 */ 1018 struct list_head retransmit; 1019 1020 /* Put chunks on this list to save them for FWD TSN processing as 1021 * they were abandoned. 1022 */ 1023 struct list_head abandoned; 1024 1025 /* How many unackd bytes do we have in-flight? */ 1026 __u32 outstanding_bytes; 1027 1028 /* Are we doing fast-rtx on this queue */ 1029 char fast_rtx; 1030 1031 /* Corked? */ 1032 char cork; 1033 }; 1034 1035 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1036 void sctp_outq_teardown(struct sctp_outq *); 1037 void sctp_outq_free(struct sctp_outq*); 1038 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1039 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1040 int sctp_outq_is_empty(const struct sctp_outq *); 1041 void sctp_outq_restart(struct sctp_outq *); 1042 1043 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1044 sctp_retransmit_reason_t); 1045 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1046 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1047 void sctp_prsctp_prune(struct sctp_association *asoc, 1048 struct sctp_sndrcvinfo *sinfo, int msg_len); 1049 /* Uncork and flush an outqueue. */ 1050 static inline void sctp_outq_cork(struct sctp_outq *q) 1051 { 1052 q->cork = 1; 1053 } 1054 1055 /* SCTP skb control block. 1056 * sctp_input_cb is currently used on rx and sock rx queue 1057 */ 1058 struct sctp_input_cb { 1059 union { 1060 struct inet_skb_parm h4; 1061 #if IS_ENABLED(CONFIG_IPV6) 1062 struct inet6_skb_parm h6; 1063 #endif 1064 } header; 1065 struct sctp_chunk *chunk; 1066 struct sctp_af *af; 1067 }; 1068 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1069 1070 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1071 { 1072 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1073 1074 return chunk->head_skb ? : skb; 1075 } 1076 1077 /* These bind address data fields common between endpoints and associations */ 1078 struct sctp_bind_addr { 1079 1080 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1081 * 1082 * SCTP Port: The local SCTP port number the endpoint is 1083 * bound to. 1084 */ 1085 __u16 port; 1086 1087 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1088 * 1089 * Address List: The list of IP addresses that this instance 1090 * has bound. This information is passed to one's 1091 * peer(s) in INIT and INIT ACK chunks. 1092 */ 1093 struct list_head address_list; 1094 }; 1095 1096 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1097 void sctp_bind_addr_free(struct sctp_bind_addr *); 1098 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1099 const struct sctp_bind_addr *src, 1100 sctp_scope_t scope, gfp_t gfp, 1101 int flags); 1102 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1103 const struct sctp_bind_addr *src, 1104 gfp_t gfp); 1105 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1106 int new_size, __u8 addr_state, gfp_t gfp); 1107 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1108 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1109 struct sctp_sock *); 1110 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1111 struct sctp_sock *, struct sctp_sock *); 1112 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1113 const union sctp_addr *addr); 1114 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1115 const union sctp_addr *addrs, 1116 int addrcnt, 1117 struct sctp_sock *opt); 1118 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1119 int *addrs_len, 1120 gfp_t gfp); 1121 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1122 __u16 port, gfp_t gfp); 1123 1124 sctp_scope_t sctp_scope(const union sctp_addr *); 1125 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1126 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1127 int sctp_is_ep_boundall(struct sock *sk); 1128 1129 1130 /* What type of endpoint? */ 1131 typedef enum { 1132 SCTP_EP_TYPE_SOCKET, 1133 SCTP_EP_TYPE_ASSOCIATION, 1134 } sctp_endpoint_type_t; 1135 1136 /* 1137 * A common base class to bridge the implmentation view of a 1138 * socket (usually listening) endpoint versus an association's 1139 * local endpoint. 1140 * This common structure is useful for several purposes: 1141 * 1) Common interface for lookup routines. 1142 * a) Subfunctions work for either endpoint or association 1143 * b) Single interface to lookup allows hiding the lookup lock rather 1144 * than acquiring it externally. 1145 * 2) Common interface for the inbound chunk handling/state machine. 1146 * 3) Common object handling routines for reference counting, etc. 1147 * 4) Disentangle association lookup from endpoint lookup, where we 1148 * do not have to find our endpoint to find our association. 1149 * 1150 */ 1151 1152 struct sctp_ep_common { 1153 /* Fields to help us manage our entries in the hash tables. */ 1154 struct hlist_node node; 1155 int hashent; 1156 1157 /* Runtime type information. What kind of endpoint is this? */ 1158 sctp_endpoint_type_t type; 1159 1160 /* Some fields to help us manage this object. 1161 * refcnt - Reference count access to this object. 1162 * dead - Do not attempt to use this object. 1163 */ 1164 atomic_t refcnt; 1165 bool dead; 1166 1167 /* What socket does this endpoint belong to? */ 1168 struct sock *sk; 1169 1170 /* This is where we receive inbound chunks. */ 1171 struct sctp_inq inqueue; 1172 1173 /* This substructure includes the defining parameters of the 1174 * endpoint: 1175 * bind_addr.port is our shared port number. 1176 * bind_addr.address_list is our set of local IP addresses. 1177 */ 1178 struct sctp_bind_addr bind_addr; 1179 }; 1180 1181 1182 /* RFC Section 1.4 Key Terms 1183 * 1184 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1185 * multi-homed host, an SCTP endpoint is represented to its peers as a 1186 * combination of a set of eligible destination transport addresses to 1187 * which SCTP packets can be sent and a set of eligible source 1188 * transport addresses from which SCTP packets can be received. 1189 * All transport addresses used by an SCTP endpoint must use the 1190 * same port number, but can use multiple IP addresses. A transport 1191 * address used by an SCTP endpoint must not be used by another 1192 * SCTP endpoint. In other words, a transport address is unique 1193 * to an SCTP endpoint. 1194 * 1195 * From an implementation perspective, each socket has one of these. 1196 * A TCP-style socket will have exactly one association on one of 1197 * these. An UDP-style socket will have multiple associations hanging 1198 * off one of these. 1199 */ 1200 1201 struct sctp_endpoint { 1202 /* Common substructure for endpoint and association. */ 1203 struct sctp_ep_common base; 1204 1205 /* Associations: A list of current associations and mappings 1206 * to the data consumers for each association. This 1207 * may be in the form of a hash table or other 1208 * implementation dependent structure. The data 1209 * consumers may be process identification 1210 * information such as file descriptors, named pipe 1211 * pointer, or table pointers dependent on how SCTP 1212 * is implemented. 1213 */ 1214 /* This is really a list of struct sctp_association entries. */ 1215 struct list_head asocs; 1216 1217 /* Secret Key: A secret key used by this endpoint to compute 1218 * the MAC. This SHOULD be a cryptographic quality 1219 * random number with a sufficient length. 1220 * Discussion in [RFC1750] can be helpful in 1221 * selection of the key. 1222 */ 1223 __u8 secret_key[SCTP_SECRET_SIZE]; 1224 1225 /* digest: This is a digest of the sctp cookie. This field is 1226 * only used on the receive path when we try to validate 1227 * that the cookie has not been tampered with. We put 1228 * this here so we pre-allocate this once and can re-use 1229 * on every receive. 1230 */ 1231 __u8 *digest; 1232 1233 /* sendbuf acct. policy. */ 1234 __u32 sndbuf_policy; 1235 1236 /* rcvbuf acct. policy. */ 1237 __u32 rcvbuf_policy; 1238 1239 /* SCTP AUTH: array of the HMACs that will be allocated 1240 * we need this per association so that we don't serialize 1241 */ 1242 struct crypto_shash **auth_hmacs; 1243 1244 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1245 struct sctp_hmac_algo_param *auth_hmacs_list; 1246 1247 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1248 struct sctp_chunks_param *auth_chunk_list; 1249 1250 /* SCTP-AUTH: endpoint shared keys */ 1251 struct list_head endpoint_shared_keys; 1252 __u16 active_key_id; 1253 __u8 auth_enable:1, 1254 prsctp_enable:1; 1255 }; 1256 1257 /* Recover the outter endpoint structure. */ 1258 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1259 { 1260 struct sctp_endpoint *ep; 1261 1262 ep = container_of(base, struct sctp_endpoint, base); 1263 return ep; 1264 } 1265 1266 /* These are function signatures for manipulating endpoints. */ 1267 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1268 void sctp_endpoint_free(struct sctp_endpoint *); 1269 void sctp_endpoint_put(struct sctp_endpoint *); 1270 void sctp_endpoint_hold(struct sctp_endpoint *); 1271 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1272 struct sctp_association *sctp_endpoint_lookup_assoc( 1273 const struct sctp_endpoint *ep, 1274 const union sctp_addr *paddr, 1275 struct sctp_transport **); 1276 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1277 const union sctp_addr *); 1278 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1279 struct net *, const union sctp_addr *); 1280 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1281 const union sctp_addr *paddr); 1282 1283 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1284 const struct sctp_association *asoc, 1285 sctp_cid_t, sctp_init_chunk_t *peer_init, 1286 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1287 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1288 const union sctp_addr *peer, 1289 sctp_init_chunk_t *init, gfp_t gfp); 1290 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1291 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1292 1293 struct sctp_inithdr_host { 1294 __u32 init_tag; 1295 __u32 a_rwnd; 1296 __u16 num_outbound_streams; 1297 __u16 num_inbound_streams; 1298 __u32 initial_tsn; 1299 }; 1300 1301 struct sctp_stream_out { 1302 __u16 ssn; 1303 __u8 state; 1304 }; 1305 1306 struct sctp_stream_in { 1307 __u16 ssn; 1308 }; 1309 1310 struct sctp_stream { 1311 struct sctp_stream_out *out; 1312 struct sctp_stream_in *in; 1313 __u16 outcnt; 1314 __u16 incnt; 1315 }; 1316 1317 #define SCTP_STREAM_CLOSED 0x00 1318 #define SCTP_STREAM_OPEN 0x01 1319 1320 /* SCTP_GET_ASSOC_STATS counters */ 1321 struct sctp_priv_assoc_stats { 1322 /* Maximum observed rto in the association during subsequent 1323 * observations. Value is set to 0 if no RTO measurement took place 1324 * The transport where the max_rto was observed is returned in 1325 * obs_rto_ipaddr 1326 */ 1327 struct sockaddr_storage obs_rto_ipaddr; 1328 __u64 max_obs_rto; 1329 /* Total In and Out SACKs received and sent */ 1330 __u64 isacks; 1331 __u64 osacks; 1332 /* Total In and Out packets received and sent */ 1333 __u64 opackets; 1334 __u64 ipackets; 1335 /* Total retransmitted chunks */ 1336 __u64 rtxchunks; 1337 /* TSN received > next expected */ 1338 __u64 outofseqtsns; 1339 /* Duplicate Chunks received */ 1340 __u64 idupchunks; 1341 /* Gap Ack Blocks received */ 1342 __u64 gapcnt; 1343 /* Unordered data chunks sent and received */ 1344 __u64 ouodchunks; 1345 __u64 iuodchunks; 1346 /* Ordered data chunks sent and received */ 1347 __u64 oodchunks; 1348 __u64 iodchunks; 1349 /* Control chunks sent and received */ 1350 __u64 octrlchunks; 1351 __u64 ictrlchunks; 1352 }; 1353 1354 /* RFC2960 1355 * 1356 * 12. Recommended Transmission Control Block (TCB) Parameters 1357 * 1358 * This section details a recommended set of parameters that should 1359 * be contained within the TCB for an implementation. This section is 1360 * for illustrative purposes and should not be deemed as requirements 1361 * on an implementation or as an exhaustive list of all parameters 1362 * inside an SCTP TCB. Each implementation may need its own additional 1363 * parameters for optimization. 1364 */ 1365 1366 1367 /* Here we have information about each individual association. */ 1368 struct sctp_association { 1369 1370 /* A base structure common to endpoint and association. 1371 * In this context, it represents the associations's view 1372 * of the local endpoint of the association. 1373 */ 1374 struct sctp_ep_common base; 1375 1376 /* Associations on the same socket. */ 1377 struct list_head asocs; 1378 1379 /* association id. */ 1380 sctp_assoc_t assoc_id; 1381 1382 /* This is our parent endpoint. */ 1383 struct sctp_endpoint *ep; 1384 1385 /* These are those association elements needed in the cookie. */ 1386 struct sctp_cookie c; 1387 1388 /* This is all information about our peer. */ 1389 struct { 1390 /* transport_addr_list 1391 * 1392 * Peer : A list of SCTP transport addresses that the 1393 * Transport : peer is bound to. This information is derived 1394 * Address : from the INIT or INIT ACK and is used to 1395 * List : associate an inbound packet with a given 1396 * : association. Normally this information is 1397 * : hashed or keyed for quick lookup and access 1398 * : of the TCB. 1399 * : The list is also initialized with the list 1400 * : of addresses passed with the sctp_connectx() 1401 * : call. 1402 * 1403 * It is a list of SCTP_transport's. 1404 */ 1405 struct list_head transport_addr_list; 1406 1407 /* rwnd 1408 * 1409 * Peer Rwnd : Current calculated value of the peer's rwnd. 1410 */ 1411 __u32 rwnd; 1412 1413 /* transport_count 1414 * 1415 * Peer : A count of the number of peer addresses 1416 * Transport : in the Peer Transport Address List. 1417 * Address : 1418 * Count : 1419 */ 1420 __u16 transport_count; 1421 1422 /* port 1423 * The transport layer port number. 1424 */ 1425 __u16 port; 1426 1427 /* primary_path 1428 * 1429 * Primary : This is the current primary destination 1430 * Path : transport address of the peer endpoint. It 1431 * : may also specify a source transport address 1432 * : on this endpoint. 1433 * 1434 * All of these paths live on transport_addr_list. 1435 * 1436 * At the bakeoffs, we discovered that the intent of 1437 * primaryPath is that it only changes when the ULP 1438 * asks to have it changed. We add the activePath to 1439 * designate the connection we are currently using to 1440 * transmit new data and most control chunks. 1441 */ 1442 struct sctp_transport *primary_path; 1443 1444 /* Cache the primary path address here, when we 1445 * need a an address for msg_name. 1446 */ 1447 union sctp_addr primary_addr; 1448 1449 /* active_path 1450 * The path that we are currently using to 1451 * transmit new data and most control chunks. 1452 */ 1453 struct sctp_transport *active_path; 1454 1455 /* retran_path 1456 * 1457 * RFC2960 6.4 Multi-homed SCTP Endpoints 1458 * ... 1459 * Furthermore, when its peer is multi-homed, an 1460 * endpoint SHOULD try to retransmit a chunk to an 1461 * active destination transport address that is 1462 * different from the last destination address to 1463 * which the DATA chunk was sent. 1464 */ 1465 struct sctp_transport *retran_path; 1466 1467 /* Pointer to last transport I have sent on. */ 1468 struct sctp_transport *last_sent_to; 1469 1470 /* This is the last transport I have received DATA on. */ 1471 struct sctp_transport *last_data_from; 1472 1473 /* 1474 * Mapping An array of bits or bytes indicating which out of 1475 * Array order TSN's have been received (relative to the 1476 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1477 * order packets have been received, this array 1478 * will be set to all zero. This structure may be 1479 * in the form of a circular buffer or bit array. 1480 * 1481 * Last Rcvd : This is the last TSN received in 1482 * TSN : sequence. This value is set initially by 1483 * : taking the peer's Initial TSN, received in 1484 * : the INIT or INIT ACK chunk, and subtracting 1485 * : one from it. 1486 * 1487 * Throughout most of the specification this is called the 1488 * "Cumulative TSN ACK Point". In this case, we 1489 * ignore the advice in 12.2 in favour of the term 1490 * used in the bulk of the text. This value is hidden 1491 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1492 */ 1493 struct sctp_tsnmap tsn_map; 1494 1495 /* This mask is used to disable sending the ASCONF chunk 1496 * with specified parameter to peer. 1497 */ 1498 __be16 addip_disabled_mask; 1499 1500 /* These are capabilities which our peer advertised. */ 1501 __u8 ecn_capable:1, /* Can peer do ECN? */ 1502 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1503 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1504 hostname_address:1, /* Peer understands DNS addresses? */ 1505 asconf_capable:1, /* Does peer support ADDIP? */ 1506 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1507 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1508 1509 /* sack_needed : This flag indicates if the next received 1510 * : packet is to be responded to with a 1511 * : SACK. This is initialized to 0. When a packet 1512 * : is received sack_cnt is incremented. If this value 1513 * : reaches 2 or more, a SACK is sent and the 1514 * : value is reset to 0. Note: This is used only 1515 * : when no DATA chunks are received out of 1516 * : order. When DATA chunks are out of order, 1517 * : SACK's are not delayed (see Section 6). 1518 */ 1519 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1520 sack_generation:1, 1521 zero_window_announced:1; 1522 __u32 sack_cnt; 1523 1524 __u32 adaptation_ind; /* Adaptation Code point. */ 1525 1526 struct sctp_inithdr_host i; 1527 void *cookie; 1528 int cookie_len; 1529 1530 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1531 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1532 * Initial TSN Value minus 1 1533 */ 1534 __u32 addip_serial; 1535 1536 /* SCTP-AUTH: We need to know pears random number, hmac list 1537 * and authenticated chunk list. All that is part of the 1538 * cookie and these are just pointers to those locations 1539 */ 1540 sctp_random_param_t *peer_random; 1541 sctp_chunks_param_t *peer_chunks; 1542 sctp_hmac_algo_param_t *peer_hmacs; 1543 } peer; 1544 1545 /* State : A state variable indicating what state the 1546 * : association is in, i.e. COOKIE-WAIT, 1547 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1548 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1549 * 1550 * Note: No "CLOSED" state is illustrated since if a 1551 * association is "CLOSED" its TCB SHOULD be removed. 1552 * 1553 * In this implementation we DO have a CLOSED 1554 * state which is used during initiation and shutdown. 1555 * 1556 * State takes values from SCTP_STATE_*. 1557 */ 1558 sctp_state_t state; 1559 1560 /* Overall : The overall association error count. 1561 * Error Count : [Clear this any time I get something.] 1562 */ 1563 int overall_error_count; 1564 1565 /* The cookie life I award for any cookie. */ 1566 ktime_t cookie_life; 1567 1568 /* These are the association's initial, max, and min RTO values. 1569 * These values will be initialized by system defaults, but can 1570 * be modified via the SCTP_RTOINFO socket option. 1571 */ 1572 unsigned long rto_initial; 1573 unsigned long rto_max; 1574 unsigned long rto_min; 1575 1576 /* Maximum number of new data packets that can be sent in a burst. */ 1577 int max_burst; 1578 1579 /* This is the max_retrans value for the association. This value will 1580 * be initialized initialized from system defaults, but can be 1581 * modified by the SCTP_ASSOCINFO socket option. 1582 */ 1583 int max_retrans; 1584 1585 /* This is the partially failed retrans value for the transport 1586 * and will be initialized from the assocs value. This can be 1587 * changed using the SCTP_PEER_ADDR_THLDS socket option 1588 */ 1589 int pf_retrans; 1590 1591 /* Maximum number of times the endpoint will retransmit INIT */ 1592 __u16 max_init_attempts; 1593 1594 /* How many times have we resent an INIT? */ 1595 __u16 init_retries; 1596 1597 /* The largest timeout or RTO value to use in attempting an INIT */ 1598 unsigned long max_init_timeo; 1599 1600 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1601 * the destination address every heartbeat interval. This value 1602 * will be inherited by all new transports. 1603 */ 1604 unsigned long hbinterval; 1605 1606 /* This is the max_retrans value for new transports in the 1607 * association. 1608 */ 1609 __u16 pathmaxrxt; 1610 1611 /* Flag that path mtu update is pending */ 1612 __u8 pmtu_pending; 1613 1614 /* Association : The smallest PMTU discovered for all of the 1615 * PMTU : peer's transport addresses. 1616 */ 1617 __u32 pathmtu; 1618 1619 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1620 __u32 param_flags; 1621 1622 __u32 sackfreq; 1623 /* SACK delay timeout */ 1624 unsigned long sackdelay; 1625 1626 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1627 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1628 1629 /* Transport to which SHUTDOWN chunk was last sent. */ 1630 struct sctp_transport *shutdown_last_sent_to; 1631 1632 /* Transport to which INIT chunk was last sent. */ 1633 struct sctp_transport *init_last_sent_to; 1634 1635 /* How many times have we resent a SHUTDOWN */ 1636 int shutdown_retries; 1637 1638 /* Next TSN : The next TSN number to be assigned to a new 1639 * : DATA chunk. This is sent in the INIT or INIT 1640 * : ACK chunk to the peer and incremented each 1641 * : time a DATA chunk is assigned a TSN 1642 * : (normally just prior to transmit or during 1643 * : fragmentation). 1644 */ 1645 __u32 next_tsn; 1646 1647 /* 1648 * Last Rcvd : This is the last TSN received in sequence. This value 1649 * TSN : is set initially by taking the peer's Initial TSN, 1650 * : received in the INIT or INIT ACK chunk, and 1651 * : subtracting one from it. 1652 * 1653 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1654 */ 1655 1656 __u32 ctsn_ack_point; 1657 1658 /* PR-SCTP Advanced.Peer.Ack.Point */ 1659 __u32 adv_peer_ack_point; 1660 1661 /* Highest TSN that is acknowledged by incoming SACKs. */ 1662 __u32 highest_sacked; 1663 1664 /* TSN marking the fast recovery exit point */ 1665 __u32 fast_recovery_exit; 1666 1667 /* Flag to track the current fast recovery state */ 1668 __u8 fast_recovery; 1669 1670 /* The number of unacknowledged data chunks. Reported through 1671 * the SCTP_STATUS sockopt. 1672 */ 1673 __u16 unack_data; 1674 1675 /* The total number of data chunks that we've had to retransmit 1676 * as the result of a T3 timer expiration 1677 */ 1678 __u32 rtx_data_chunks; 1679 1680 /* This is the association's receive buffer space. This value is used 1681 * to set a_rwnd field in an INIT or a SACK chunk. 1682 */ 1683 __u32 rwnd; 1684 1685 /* This is the last advertised value of rwnd over a SACK chunk. */ 1686 __u32 a_rwnd; 1687 1688 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1689 * to slop over a maximum of the association's frag_point. 1690 */ 1691 __u32 rwnd_over; 1692 1693 /* Keeps treack of rwnd pressure. This happens when we have 1694 * a window, but not recevie buffer (i.e small packets). This one 1695 * is releases slowly (1 PMTU at a time ). 1696 */ 1697 __u32 rwnd_press; 1698 1699 /* This is the sndbuf size in use for the association. 1700 * This corresponds to the sndbuf size for the association, 1701 * as specified in the sk->sndbuf. 1702 */ 1703 int sndbuf_used; 1704 1705 /* This is the amount of memory that this association has allocated 1706 * in the receive path at any given time. 1707 */ 1708 atomic_t rmem_alloc; 1709 1710 /* This is the wait queue head for send requests waiting on 1711 * the association sndbuf space. 1712 */ 1713 wait_queue_head_t wait; 1714 1715 /* The message size at which SCTP fragmentation will occur. */ 1716 __u32 frag_point; 1717 __u32 user_frag; 1718 1719 /* Counter used to count INIT errors. */ 1720 int init_err_counter; 1721 1722 /* Count the number of INIT cycles (for doubling timeout). */ 1723 int init_cycle; 1724 1725 /* Default send parameters. */ 1726 __u16 default_stream; 1727 __u16 default_flags; 1728 __u32 default_ppid; 1729 __u32 default_context; 1730 __u32 default_timetolive; 1731 1732 /* Default receive parameters */ 1733 __u32 default_rcv_context; 1734 1735 /* Stream arrays */ 1736 struct sctp_stream *stream; 1737 1738 /* All outbound chunks go through this structure. */ 1739 struct sctp_outq outqueue; 1740 1741 /* A smart pipe that will handle reordering and fragmentation, 1742 * as well as handle passing events up to the ULP. 1743 */ 1744 struct sctp_ulpq ulpq; 1745 1746 /* Last TSN that caused an ECNE Chunk to be sent. */ 1747 __u32 last_ecne_tsn; 1748 1749 /* Last TSN that caused a CWR Chunk to be sent. */ 1750 __u32 last_cwr_tsn; 1751 1752 /* How many duplicated TSNs have we seen? */ 1753 int numduptsns; 1754 1755 /* These are to support 1756 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1757 * and Enforcement of Flow and Message Limits" 1758 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1759 * or "ADDIP" for short. 1760 */ 1761 1762 1763 1764 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1765 * 1766 * R1) One and only one ASCONF Chunk MAY be in transit and 1767 * unacknowledged at any one time. If a sender, after sending 1768 * an ASCONF chunk, decides it needs to transfer another 1769 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1770 * returns from the previous ASCONF Chunk before sending a 1771 * subsequent ASCONF. Note this restriction binds each side, 1772 * so at any time two ASCONF may be in-transit on any given 1773 * association (one sent from each endpoint). 1774 * 1775 * [This is our one-and-only-one ASCONF in flight. If we do 1776 * not have an ASCONF in flight, this is NULL.] 1777 */ 1778 struct sctp_chunk *addip_last_asconf; 1779 1780 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1781 * 1782 * This is needed to implement itmes E1 - E4 of the updated 1783 * spec. Here is the justification: 1784 * 1785 * Since the peer may bundle multiple ASCONF chunks toward us, 1786 * we now need the ability to cache multiple ACKs. The section 1787 * describes in detail how they are cached and cleaned up. 1788 */ 1789 struct list_head asconf_ack_list; 1790 1791 /* These ASCONF chunks are waiting to be sent. 1792 * 1793 * These chunaks can't be pushed to outqueue until receiving 1794 * ASCONF_ACK for the previous ASCONF indicated by 1795 * addip_last_asconf, so as to guarantee that only one ASCONF 1796 * is in flight at any time. 1797 * 1798 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1799 * 1800 * In defining the ASCONF Chunk transfer procedures, it is 1801 * essential that these transfers MUST NOT cause congestion 1802 * within the network. To achieve this, we place these 1803 * restrictions on the transfer of ASCONF Chunks: 1804 * 1805 * R1) One and only one ASCONF Chunk MAY be in transit and 1806 * unacknowledged at any one time. If a sender, after sending 1807 * an ASCONF chunk, decides it needs to transfer another 1808 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1809 * returns from the previous ASCONF Chunk before sending a 1810 * subsequent ASCONF. Note this restriction binds each side, 1811 * so at any time two ASCONF may be in-transit on any given 1812 * association (one sent from each endpoint). 1813 * 1814 * 1815 * [I really think this is EXACTLY the sort of intelligence 1816 * which already resides in sctp_outq. Please move this 1817 * queue and its supporting logic down there. --piggy] 1818 */ 1819 struct list_head addip_chunk_list; 1820 1821 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1822 * 1823 * A2) A serial number should be assigned to the Chunk. The 1824 * serial number SHOULD be a monotonically increasing 1825 * number. The serial number SHOULD be initialized at 1826 * the start of the association to the same value as the 1827 * Initial TSN and every time a new ASCONF chunk is created 1828 * it is incremented by one after assigning the serial number 1829 * to the newly created chunk. 1830 * 1831 * ADDIP 1832 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1833 * 1834 * Serial Number : 32 bits (unsigned integer) 1835 * 1836 * This value represents a Serial Number for the ASCONF 1837 * Chunk. The valid range of Serial Number is from 0 to 1838 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1839 * after reaching 4294967295. 1840 */ 1841 __u32 addip_serial; 1842 int src_out_of_asoc_ok; 1843 union sctp_addr *asconf_addr_del_pending; 1844 struct sctp_transport *new_transport; 1845 1846 /* SCTP AUTH: list of the endpoint shared keys. These 1847 * keys are provided out of band by the user applicaton 1848 * and can't change during the lifetime of the association 1849 */ 1850 struct list_head endpoint_shared_keys; 1851 1852 /* SCTP AUTH: 1853 * The current generated assocaition shared key (secret) 1854 */ 1855 struct sctp_auth_bytes *asoc_shared_key; 1856 1857 /* SCTP AUTH: hmac id of the first peer requested algorithm 1858 * that we support. 1859 */ 1860 __u16 default_hmac_id; 1861 1862 __u16 active_key_id; 1863 1864 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1865 temp:1, /* Is it a temporary association? */ 1866 prsctp_enable:1; 1867 1868 __u32 strreset_outseq; /* Update after receiving response */ 1869 __u32 strreset_inseq; /* Update after receiving request */ 1870 1871 struct sctp_priv_assoc_stats stats; 1872 1873 int sent_cnt_removable; 1874 1875 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1876 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1877 }; 1878 1879 1880 /* An eyecatcher for determining if we are really looking at an 1881 * association data structure. 1882 */ 1883 enum { 1884 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1885 }; 1886 1887 /* Recover the outter association structure. */ 1888 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1889 { 1890 struct sctp_association *asoc; 1891 1892 asoc = container_of(base, struct sctp_association, base); 1893 return asoc; 1894 } 1895 1896 /* These are function signatures for manipulating associations. */ 1897 1898 1899 struct sctp_association * 1900 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1901 sctp_scope_t scope, gfp_t gfp); 1902 void sctp_association_free(struct sctp_association *); 1903 void sctp_association_put(struct sctp_association *); 1904 void sctp_association_hold(struct sctp_association *); 1905 1906 struct sctp_transport *sctp_assoc_choose_alter_transport( 1907 struct sctp_association *, struct sctp_transport *); 1908 void sctp_assoc_update_retran_path(struct sctp_association *); 1909 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1910 const union sctp_addr *); 1911 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1912 const union sctp_addr *laddr); 1913 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1914 const union sctp_addr *address, 1915 const gfp_t gfp, 1916 const int peer_state); 1917 void sctp_assoc_del_peer(struct sctp_association *asoc, 1918 const union sctp_addr *addr); 1919 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1920 struct sctp_transport *peer); 1921 void sctp_assoc_control_transport(struct sctp_association *, 1922 struct sctp_transport *, 1923 sctp_transport_cmd_t, sctp_sn_error_t); 1924 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1925 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1926 struct net *, 1927 const union sctp_addr *, 1928 const union sctp_addr *); 1929 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1930 void sctp_assoc_update(struct sctp_association *old, 1931 struct sctp_association *new); 1932 1933 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1934 1935 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *); 1936 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1937 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1938 void sctp_assoc_set_primary(struct sctp_association *, 1939 struct sctp_transport *); 1940 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1941 struct sctp_transport *); 1942 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1943 sctp_scope_t, gfp_t); 1944 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1945 struct sctp_cookie*, 1946 gfp_t gfp); 1947 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1948 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1949 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1950 const struct sctp_association *asoc, 1951 __be32 serial); 1952 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1953 1954 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1955 const union sctp_addr *ss2); 1956 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1957 1958 /* A convenience structure to parse out SCTP specific CMSGs. */ 1959 typedef struct sctp_cmsgs { 1960 struct sctp_initmsg *init; 1961 struct sctp_sndrcvinfo *srinfo; 1962 struct sctp_sndinfo *sinfo; 1963 } sctp_cmsgs_t; 1964 1965 /* Structure for tracking memory objects */ 1966 typedef struct { 1967 char *label; 1968 atomic_t *counter; 1969 } sctp_dbg_objcnt_entry_t; 1970 1971 #endif /* __sctp_structs_h__ */ 1972