1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * This SCTP implementation is free software; 10 * you can redistribute it and/or modify it under the terms of 11 * the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This SCTP implementation is distributed in the hope that it 16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 17 * ************************ 18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 19 * See the GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with GNU CC; see the file COPYING. If not, see 23 * <http://www.gnu.org/licenses/>. 24 * 25 * Please send any bug reports or fixes you make to the 26 * email addresses: 27 * lksctp developers <linux-sctp@vger.kernel.org> 28 * 29 * Written or modified by: 30 * Randall Stewart <randall@sctp.chicago.il.us> 31 * Ken Morneau <kmorneau@cisco.com> 32 * Qiaobing Xie <qxie1@email.mot.com> 33 * La Monte H.P. Yarroll <piggy@acm.org> 34 * Karl Knutson <karl@athena.chicago.il.us> 35 * Jon Grimm <jgrimm@us.ibm.com> 36 * Xingang Guo <xingang.guo@intel.com> 37 * Hui Huang <hui.huang@nokia.com> 38 * Sridhar Samudrala <sri@us.ibm.com> 39 * Daisy Chang <daisyc@us.ibm.com> 40 * Dajiang Zhang <dajiang.zhang@nokia.com> 41 * Ardelle Fan <ardelle.fan@intel.com> 42 * Ryan Layer <rmlayer@us.ibm.com> 43 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 44 * Kevin Gao <kevin.gao@intel.com> 45 */ 46 47 #ifndef __sctp_structs_h__ 48 #define __sctp_structs_h__ 49 50 #include <linux/ktime.h> 51 #include <linux/rhashtable.h> 52 #include <linux/socket.h> /* linux/in.h needs this!! */ 53 #include <linux/in.h> /* We get struct sockaddr_in. */ 54 #include <linux/in6.h> /* We get struct in6_addr */ 55 #include <linux/ipv6.h> 56 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 57 #include <linux/atomic.h> /* This gets us atomic counters. */ 58 #include <linux/skbuff.h> /* We need sk_buff_head. */ 59 #include <linux/workqueue.h> /* We need tq_struct. */ 60 #include <linux/sctp.h> /* We need sctp* header structs. */ 61 #include <net/sctp/auth.h> /* We need auth specific structs */ 62 #include <net/ip.h> /* For inet_skb_parm */ 63 64 /* A convenience structure for handling sockaddr structures. 65 * We should wean ourselves off this. 66 */ 67 union sctp_addr { 68 struct sockaddr_in v4; 69 struct sockaddr_in6 v6; 70 struct sockaddr sa; 71 }; 72 73 /* Forward declarations for data structures. */ 74 struct sctp_globals; 75 struct sctp_endpoint; 76 struct sctp_association; 77 struct sctp_transport; 78 struct sctp_packet; 79 struct sctp_chunk; 80 struct sctp_inq; 81 struct sctp_outq; 82 struct sctp_bind_addr; 83 struct sctp_ulpq; 84 struct sctp_ep_common; 85 struct crypto_shash; 86 struct sctp_stream; 87 88 89 #include <net/sctp/tsnmap.h> 90 #include <net/sctp/ulpevent.h> 91 #include <net/sctp/ulpqueue.h> 92 93 /* Structures useful for managing bind/connect. */ 94 95 struct sctp_bind_bucket { 96 unsigned short port; 97 unsigned short fastreuse; 98 struct hlist_node node; 99 struct hlist_head owner; 100 struct net *net; 101 }; 102 103 struct sctp_bind_hashbucket { 104 spinlock_t lock; 105 struct hlist_head chain; 106 }; 107 108 /* Used for hashing all associations. */ 109 struct sctp_hashbucket { 110 rwlock_t lock; 111 struct hlist_head chain; 112 } __attribute__((__aligned__(8))); 113 114 115 /* The SCTP globals structure. */ 116 extern struct sctp_globals { 117 /* This is a list of groups of functions for each address 118 * family that we support. 119 */ 120 struct list_head address_families; 121 122 /* This is the hash of all endpoints. */ 123 struct sctp_hashbucket *ep_hashtable; 124 /* This is the sctp port control hash. */ 125 struct sctp_bind_hashbucket *port_hashtable; 126 /* This is the hash of all transports. */ 127 struct rhltable transport_hashtable; 128 129 /* Sizes of above hashtables. */ 130 int ep_hashsize; 131 int port_hashsize; 132 133 /* Default initialization values to be applied to new associations. */ 134 __u16 max_instreams; 135 __u16 max_outstreams; 136 137 /* Flag to indicate whether computing and verifying checksum 138 * is disabled. */ 139 bool checksum_disable; 140 } sctp_globals; 141 142 #define sctp_max_instreams (sctp_globals.max_instreams) 143 #define sctp_max_outstreams (sctp_globals.max_outstreams) 144 #define sctp_address_families (sctp_globals.address_families) 145 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 146 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 147 #define sctp_port_hashsize (sctp_globals.port_hashsize) 148 #define sctp_port_hashtable (sctp_globals.port_hashtable) 149 #define sctp_transport_hashtable (sctp_globals.transport_hashtable) 150 #define sctp_checksum_disable (sctp_globals.checksum_disable) 151 152 /* SCTP Socket type: UDP or TCP style. */ 153 enum sctp_socket_type { 154 SCTP_SOCKET_UDP = 0, 155 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 156 SCTP_SOCKET_TCP 157 }; 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 enum sctp_socket_type 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(struct sctp_paramhdr) + 314 SCTP_AUTH_RANDOM_LENGTH]; 315 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 316 __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; 317 318 /* This is a shim for my peer's INIT packet, followed by 319 * a copy of the raw address list of the association. 320 * The length of the raw address list is saved in the 321 * raw_addr_list_len field, which will be used at the time when 322 * the association TCB is re-constructed from the cookie. 323 */ 324 __u32 raw_addr_list_len; 325 struct sctp_init_chunk peer_init[0]; 326 }; 327 328 329 /* The format of our cookie that we send to our peer. */ 330 struct sctp_signed_cookie { 331 __u8 signature[SCTP_SECRET_SIZE]; 332 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 333 struct sctp_cookie c; 334 } __packed; 335 336 /* This is another convenience type to allocate memory for address 337 * params for the maximum size and pass such structures around 338 * internally. 339 */ 340 union sctp_addr_param { 341 struct sctp_paramhdr p; 342 struct sctp_ipv4addr_param v4; 343 struct sctp_ipv6addr_param v6; 344 }; 345 346 /* A convenience type to allow walking through the various 347 * parameters and avoid casting all over the place. 348 */ 349 union sctp_params { 350 void *v; 351 struct sctp_paramhdr *p; 352 struct sctp_cookie_preserve_param *life; 353 struct sctp_hostname_param *dns; 354 struct sctp_cookie_param *cookie; 355 struct sctp_supported_addrs_param *sat; 356 struct sctp_ipv4addr_param *v4; 357 struct sctp_ipv6addr_param *v6; 358 union sctp_addr_param *addr; 359 struct sctp_adaptation_ind_param *aind; 360 struct sctp_supported_ext_param *ext; 361 struct sctp_random_param *random; 362 struct sctp_chunks_param *chunks; 363 struct sctp_hmac_algo_param *hmac_algo; 364 struct sctp_addip_param *addip; 365 }; 366 367 /* RFC 2960. Section 3.3.5 Heartbeat. 368 * Heartbeat Information: variable length 369 * The Sender-specific Heartbeat Info field should normally include 370 * information about the sender's current time when this HEARTBEAT 371 * chunk is sent and the destination transport address to which this 372 * HEARTBEAT is sent (see Section 8.3). 373 */ 374 struct sctp_sender_hb_info { 375 struct sctp_paramhdr param_hdr; 376 union sctp_addr daddr; 377 unsigned long sent_at; 378 __u64 hb_nonce; 379 }; 380 381 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 382 gfp_t gfp); 383 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid); 384 void sctp_stream_free(struct sctp_stream *stream); 385 void sctp_stream_clear(struct sctp_stream *stream); 386 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); 387 388 /* What is the current SSN number for this stream? */ 389 #define sctp_ssn_peek(stream, type, sid) \ 390 ((stream)->type[sid].ssn) 391 392 /* Return the next SSN number for this stream. */ 393 #define sctp_ssn_next(stream, type, sid) \ 394 ((stream)->type[sid].ssn++) 395 396 /* Skip over this ssn and all below. */ 397 #define sctp_ssn_skip(stream, type, sid, ssn) \ 398 ((stream)->type[sid].ssn = ssn + 1) 399 400 /* 401 * Pointers to address related SCTP functions. 402 * (i.e. things that depend on the address family.) 403 */ 404 struct sctp_af { 405 int (*sctp_xmit) (struct sk_buff *skb, 406 struct sctp_transport *); 407 int (*setsockopt) (struct sock *sk, 408 int level, 409 int optname, 410 char __user *optval, 411 unsigned int optlen); 412 int (*getsockopt) (struct sock *sk, 413 int level, 414 int optname, 415 char __user *optval, 416 int __user *optlen); 417 int (*compat_setsockopt) (struct sock *sk, 418 int level, 419 int optname, 420 char __user *optval, 421 unsigned int optlen); 422 int (*compat_getsockopt) (struct sock *sk, 423 int level, 424 int optname, 425 char __user *optval, 426 int __user *optlen); 427 void (*get_dst) (struct sctp_transport *t, 428 union sctp_addr *saddr, 429 struct flowi *fl, 430 struct sock *sk); 431 void (*get_saddr) (struct sctp_sock *sk, 432 struct sctp_transport *t, 433 struct flowi *fl); 434 void (*copy_addrlist) (struct list_head *, 435 struct net_device *); 436 int (*cmp_addr) (const union sctp_addr *addr1, 437 const union sctp_addr *addr2); 438 void (*addr_copy) (union sctp_addr *dst, 439 union sctp_addr *src); 440 void (*from_skb) (union sctp_addr *, 441 struct sk_buff *skb, 442 int saddr); 443 void (*from_sk) (union sctp_addr *, 444 struct sock *sk); 445 void (*from_addr_param) (union sctp_addr *, 446 union sctp_addr_param *, 447 __be16 port, int iif); 448 int (*to_addr_param) (const union sctp_addr *, 449 union sctp_addr_param *); 450 int (*addr_valid) (union sctp_addr *, 451 struct sctp_sock *, 452 const struct sk_buff *); 453 enum sctp_scope (*scope)(union sctp_addr *); 454 void (*inaddr_any) (union sctp_addr *, __be16); 455 int (*is_any) (const union sctp_addr *); 456 int (*available) (union sctp_addr *, 457 struct sctp_sock *); 458 int (*skb_iif) (const struct sk_buff *sk); 459 int (*is_ce) (const struct sk_buff *sk); 460 void (*seq_dump_addr)(struct seq_file *seq, 461 union sctp_addr *addr); 462 void (*ecn_capable)(struct sock *sk); 463 __u16 net_header_len; 464 int sockaddr_len; 465 sa_family_t sa_family; 466 struct list_head list; 467 }; 468 469 struct sctp_af *sctp_get_af_specific(sa_family_t); 470 int sctp_register_af(struct sctp_af *); 471 472 /* Protocol family functions. */ 473 struct sctp_pf { 474 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 475 void (*skb_msgname) (struct sk_buff *, char *, int *); 476 int (*af_supported) (sa_family_t, struct sctp_sock *); 477 int (*cmp_addr) (const union sctp_addr *, 478 const union sctp_addr *, 479 struct sctp_sock *); 480 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 481 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 482 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 483 struct sock *(*create_accept_sk) (struct sock *sk, 484 struct sctp_association *asoc, 485 bool kern); 486 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 487 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 488 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 489 struct sctp_af *af; 490 }; 491 492 493 /* Structure to track chunk fragments that have been acked, but peer 494 * fragments of the same message have not. 495 */ 496 struct sctp_datamsg { 497 /* Chunks waiting to be submitted to lower layer. */ 498 struct list_head chunks; 499 /* Reference counting. */ 500 refcount_t refcnt; 501 /* When is this message no longer interesting to the peer? */ 502 unsigned long expires_at; 503 /* Did the messenge fail to send? */ 504 int send_error; 505 u8 send_failed:1, 506 can_delay:1, /* should this message be Nagle delayed */ 507 abandoned:1; /* should this message be abandoned */ 508 }; 509 510 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 511 struct sctp_sndrcvinfo *, 512 struct iov_iter *); 513 void sctp_datamsg_free(struct sctp_datamsg *); 514 void sctp_datamsg_put(struct sctp_datamsg *); 515 void sctp_chunk_fail(struct sctp_chunk *, int error); 516 int sctp_chunk_abandoned(struct sctp_chunk *); 517 518 /* RFC2960 1.4 Key Terms 519 * 520 * o Chunk: A unit of information within an SCTP packet, consisting of 521 * a chunk header and chunk-specific content. 522 * 523 * As a matter of convenience, we remember the SCTP common header for 524 * each chunk as well as a few other header pointers... 525 */ 526 struct sctp_chunk { 527 struct list_head list; 528 529 refcount_t refcnt; 530 531 /* How many times this chunk have been sent, for prsctp RTX policy */ 532 int sent_count; 533 534 union { 535 /* This is our link to the per-transport transmitted list. */ 536 struct list_head transmitted_list; 537 /* List in specific stream outq */ 538 struct list_head stream_list; 539 }; 540 541 /* This field is used by chunks that hold fragmented data. 542 * For the first fragment this is the list that holds the rest of 543 * fragments. For the remaining fragments, this is the link to the 544 * frag_list maintained in the first fragment. 545 */ 546 struct list_head frag_list; 547 548 /* This points to the sk_buff containing the actual data. */ 549 struct sk_buff *skb; 550 551 /* In case of GSO packets, this will store the head one */ 552 struct sk_buff *head_skb; 553 554 /* These are the SCTP headers by reverse order in a packet. 555 * Note that some of these may happen more than once. In that 556 * case, we point at the "current" one, whatever that means 557 * for that level of header. 558 */ 559 560 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 561 union sctp_params param_hdr; 562 union { 563 __u8 *v; 564 struct sctp_datahdr *data_hdr; 565 struct sctp_inithdr *init_hdr; 566 struct sctp_sackhdr *sack_hdr; 567 struct sctp_heartbeathdr *hb_hdr; 568 struct sctp_sender_hb_info *hbs_hdr; 569 struct sctp_shutdownhdr *shutdown_hdr; 570 struct sctp_signed_cookie *cookie_hdr; 571 struct sctp_ecnehdr *ecne_hdr; 572 struct sctp_cwrhdr *ecn_cwr_hdr; 573 struct sctp_errhdr *err_hdr; 574 struct sctp_addiphdr *addip_hdr; 575 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 576 struct sctp_authhdr *auth_hdr; 577 } subh; 578 579 __u8 *chunk_end; 580 581 struct sctp_chunkhdr *chunk_hdr; 582 struct sctphdr *sctp_hdr; 583 584 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 585 struct sctp_sndrcvinfo sinfo; 586 587 /* Which association does this belong to? */ 588 struct sctp_association *asoc; 589 590 /* What endpoint received this chunk? */ 591 struct sctp_ep_common *rcvr; 592 593 /* We fill this in if we are calculating RTT. */ 594 unsigned long sent_at; 595 596 /* What is the origin IP address for this chunk? */ 597 union sctp_addr source; 598 /* Destination address for this chunk. */ 599 union sctp_addr dest; 600 601 /* For outbound message, track all fragments for SEND_FAILED. */ 602 struct sctp_datamsg *msg; 603 604 /* For an inbound chunk, this tells us where it came from. 605 * For an outbound chunk, it tells us where we'd like it to 606 * go. It is NULL if we have no preference. 607 */ 608 struct sctp_transport *transport; 609 610 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 611 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 612 * spec violates the principle premis that all chunks are processed 613 * in order. 614 */ 615 struct sk_buff *auth_chunk; 616 617 #define SCTP_CAN_FRTX 0x0 618 #define SCTP_NEED_FRTX 0x1 619 #define SCTP_DONT_FRTX 0x2 620 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 621 has_tsn:1, /* Does this chunk have a TSN yet? */ 622 has_ssn:1, /* Does this chunk have a SSN yet? */ 623 singleton:1, /* Only chunk in the packet? */ 624 end_of_packet:1, /* Last chunk in the packet? */ 625 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 626 pdiscard:1, /* Discard the whole packet now? */ 627 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 628 data_accepted:1, /* At least 1 chunk accepted */ 629 auth:1, /* IN: was auth'ed | OUT: needs auth */ 630 has_asconf:1, /* IN: have seen an asconf before */ 631 tsn_missing_report:2, /* Data chunk missing counter. */ 632 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 633 }; 634 635 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 636 void sctp_chunk_hold(struct sctp_chunk *); 637 void sctp_chunk_put(struct sctp_chunk *); 638 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 639 struct iov_iter *from); 640 void sctp_chunk_free(struct sctp_chunk *); 641 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 642 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 643 const struct sctp_association *, 644 struct sock *, gfp_t gfp); 645 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 646 union sctp_addr *); 647 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 648 649 static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) 650 { 651 return ntohs(ch->subh.data_hdr->stream); 652 } 653 654 enum { 655 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 656 SCTP_ADDR_SRC, /* address can be used as source */ 657 SCTP_ADDR_DEL, /* address about to be deleted */ 658 }; 659 660 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 661 struct sctp_sockaddr_entry { 662 struct list_head list; 663 struct rcu_head rcu; 664 union sctp_addr a; 665 __u8 state; 666 __u8 valid; 667 }; 668 669 #define SCTP_ADDRESS_TICK_DELAY 500 670 671 /* This structure holds lists of chunks as we are assembling for 672 * transmission. 673 */ 674 struct sctp_packet { 675 /* These are the SCTP header values (host order) for the packet. */ 676 __u16 source_port; 677 __u16 destination_port; 678 __u32 vtag; 679 680 /* This contains the payload chunks. */ 681 struct list_head chunk_list; 682 683 /* This is the overhead of the sctp and ip headers. */ 684 size_t overhead; 685 /* This is the total size of all chunks INCLUDING padding. */ 686 size_t size; 687 /* This is the maximum size this packet may have */ 688 size_t max_size; 689 690 /* The packet is destined for this transport address. 691 * The function we finally use to pass down to the next lower 692 * layer lives in the transport structure. 693 */ 694 struct sctp_transport *transport; 695 696 /* pointer to the auth chunk for this packet */ 697 struct sctp_chunk *auth; 698 699 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 700 has_sack:1, /* This packet contains a SACK chunk. */ 701 has_auth:1, /* This packet contains an AUTH chunk */ 702 has_data:1, /* This packet contains at least 1 DATA chunk */ 703 ipfragok:1; /* So let ip fragment this packet */ 704 }; 705 706 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 707 __u16 sport, __u16 dport); 708 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 709 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, 710 struct sctp_chunk *chunk, 711 int one_packet, gfp_t gfp); 712 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, 713 struct sctp_chunk *chunk); 714 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 715 void sctp_packet_free(struct sctp_packet *); 716 717 static inline int sctp_packet_empty(struct sctp_packet *packet) 718 { 719 return packet->size == packet->overhead; 720 } 721 722 /* This represents a remote transport address. 723 * For local transport addresses, we just use union sctp_addr. 724 * 725 * RFC2960 Section 1.4 Key Terms 726 * 727 * o Transport address: A Transport Address is traditionally defined 728 * by Network Layer address, Transport Layer protocol and Transport 729 * Layer port number. In the case of SCTP running over IP, a 730 * transport address is defined by the combination of an IP address 731 * and an SCTP port number (where SCTP is the Transport protocol). 732 * 733 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 734 * 735 * o The sender keeps a separate congestion control parameter set for 736 * each of the destination addresses it can send to (not each 737 * source-destination pair but for each destination). The parameters 738 * should decay if the address is not used for a long enough time 739 * period. 740 * 741 */ 742 struct sctp_transport { 743 /* A list of transports. */ 744 struct list_head transports; 745 struct rhlist_head node; 746 747 /* Reference counting. */ 748 refcount_t refcnt; 749 /* RTO-Pending : A flag used to track if one of the DATA 750 * chunks sent to this address is currently being 751 * used to compute a RTT. If this flag is 0, 752 * the next DATA chunk sent to this destination 753 * should be used to compute a RTT and this flag 754 * should be set. Every time the RTT 755 * calculation completes (i.e. the DATA chunk 756 * is SACK'd) clear this flag. 757 */ 758 __u32 rto_pending:1, 759 760 /* 761 * hb_sent : a flag that signals that we have a pending 762 * heartbeat. 763 */ 764 hb_sent:1, 765 766 /* Is the Path MTU update pending on this tranport */ 767 pmtu_pending:1, 768 769 dst_pending_confirm:1, /* need to confirm neighbour */ 770 771 /* Has this transport moved the ctsn since we last sacked */ 772 sack_generation:1; 773 u32 dst_cookie; 774 775 struct flowi fl; 776 777 /* This is the peer's IP address and port. */ 778 union sctp_addr ipaddr; 779 780 /* These are the functions we call to handle LLP stuff. */ 781 struct sctp_af *af_specific; 782 783 /* Which association do we belong to? */ 784 struct sctp_association *asoc; 785 786 /* RFC2960 787 * 788 * 12.3 Per Transport Address Data 789 * 790 * For each destination transport address in the peer's 791 * address list derived from the INIT or INIT ACK chunk, a 792 * number of data elements needs to be maintained including: 793 */ 794 /* RTO : The current retransmission timeout value. */ 795 unsigned long rto; 796 797 __u32 rtt; /* This is the most recent RTT. */ 798 799 /* RTTVAR : The current RTT variation. */ 800 __u32 rttvar; 801 802 /* SRTT : The current smoothed round trip time. */ 803 __u32 srtt; 804 805 /* 806 * These are the congestion stats. 807 */ 808 /* cwnd : The current congestion window. */ 809 __u32 cwnd; /* This is the actual cwnd. */ 810 811 /* ssthresh : The current slow start threshold value. */ 812 __u32 ssthresh; 813 814 /* partial : The tracking method for increase of cwnd when in 815 * bytes acked : congestion avoidance mode (see Section 6.2.2) 816 */ 817 __u32 partial_bytes_acked; 818 819 /* Data that has been sent, but not acknowledged. */ 820 __u32 flight_size; 821 822 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 823 824 /* Destination */ 825 struct dst_entry *dst; 826 /* Source address. */ 827 union sctp_addr saddr; 828 829 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 830 * the destination address every heartbeat interval. 831 */ 832 unsigned long hbinterval; 833 834 /* SACK delay timeout */ 835 unsigned long sackdelay; 836 __u32 sackfreq; 837 838 /* When was the last time that we heard from this transport? We use 839 * this to pick new active and retran paths. 840 */ 841 ktime_t last_time_heard; 842 843 /* When was the last time that we sent a chunk using this 844 * transport? We use this to check for idle transports 845 */ 846 unsigned long last_time_sent; 847 848 /* Last time(in jiffies) when cwnd is reduced due to the congestion 849 * indication based on ECNE chunk. 850 */ 851 unsigned long last_time_ecne_reduced; 852 853 /* This is the max_retrans value for the transport and will 854 * be initialized from the assocs value. This can be changed 855 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 856 */ 857 __u16 pathmaxrxt; 858 859 /* This is the partially failed retrans value for the transport 860 * and will be initialized from the assocs value. This can be changed 861 * using the SCTP_PEER_ADDR_THLDS socket option 862 */ 863 int pf_retrans; 864 /* PMTU : The current known path MTU. */ 865 __u32 pathmtu; 866 867 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 868 __u32 param_flags; 869 870 /* The number of times INIT has been sent on this transport. */ 871 int init_sent_count; 872 873 /* state : The current state of this destination, 874 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 875 */ 876 int state; 877 878 /* These are the error stats for this destination. */ 879 880 /* Error count : The current error count for this destination. */ 881 unsigned short error_count; 882 883 /* Per : A timer used by each destination. 884 * Destination : 885 * Timer : 886 * 887 * [Everywhere else in the text this is called T3-rtx. -ed] 888 */ 889 struct timer_list T3_rtx_timer; 890 891 /* Heartbeat timer is per destination. */ 892 struct timer_list hb_timer; 893 894 /* Timer to handle ICMP proto unreachable envets */ 895 struct timer_list proto_unreach_timer; 896 897 /* Timer to handler reconf chunk rtx */ 898 struct timer_list reconf_timer; 899 900 /* Since we're using per-destination retransmission timers 901 * (see above), we're also using per-destination "transmitted" 902 * queues. This probably ought to be a private struct 903 * accessible only within the outqueue, but it's not, yet. 904 */ 905 struct list_head transmitted; 906 907 /* We build bundle-able packets for this transport here. */ 908 struct sctp_packet packet; 909 910 /* This is the list of transports that have chunks to send. */ 911 struct list_head send_ready; 912 913 /* State information saved for SFR_CACC algorithm. The key 914 * idea in SFR_CACC is to maintain state at the sender on a 915 * per-destination basis when a changeover happens. 916 * char changeover_active; 917 * char cycling_changeover; 918 * __u32 next_tsn_at_change; 919 * char cacc_saw_newack; 920 */ 921 struct { 922 /* An unsigned integer, which stores the next TSN to be 923 * used by the sender, at the moment of changeover. 924 */ 925 __u32 next_tsn_at_change; 926 927 /* A flag which indicates the occurrence of a changeover */ 928 char changeover_active; 929 930 /* A flag which indicates whether the change of primary is 931 * the first switch to this destination address during an 932 * active switch. 933 */ 934 char cycling_changeover; 935 936 /* A temporary flag, which is used during the processing of 937 * a SACK to estimate the causative TSN(s)'s group. 938 */ 939 char cacc_saw_newack; 940 } cacc; 941 942 /* 64-bit random number sent with heartbeat. */ 943 __u64 hb_nonce; 944 945 struct rcu_head rcu; 946 }; 947 948 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 949 gfp_t); 950 void sctp_transport_set_owner(struct sctp_transport *, 951 struct sctp_association *); 952 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 953 struct sctp_sock *); 954 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 955 void sctp_transport_free(struct sctp_transport *); 956 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 957 void sctp_transport_reset_hb_timer(struct sctp_transport *); 958 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 959 int sctp_transport_hold(struct sctp_transport *); 960 void sctp_transport_put(struct sctp_transport *); 961 void sctp_transport_update_rto(struct sctp_transport *, __u32); 962 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 963 void sctp_transport_lower_cwnd(struct sctp_transport *t, 964 enum sctp_lower_cwnd reason); 965 void sctp_transport_burst_limited(struct sctp_transport *); 966 void sctp_transport_burst_reset(struct sctp_transport *); 967 unsigned long sctp_transport_timeout(struct sctp_transport *); 968 void sctp_transport_reset(struct sctp_transport *t); 969 void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); 970 void sctp_transport_immediate_rtx(struct sctp_transport *); 971 void sctp_transport_dst_release(struct sctp_transport *t); 972 void sctp_transport_dst_confirm(struct sctp_transport *t); 973 974 975 /* This is the structure we use to queue packets as they come into 976 * SCTP. We write packets to it and read chunks from it. 977 */ 978 struct sctp_inq { 979 /* This is actually a queue of sctp_chunk each 980 * containing a partially decoded packet. 981 */ 982 struct list_head in_chunk_list; 983 /* This is the packet which is currently off the in queue and is 984 * being worked on through the inbound chunk processing. 985 */ 986 struct sctp_chunk *in_progress; 987 988 /* This is the delayed task to finish delivering inbound 989 * messages. 990 */ 991 struct work_struct immediate; 992 }; 993 994 void sctp_inq_init(struct sctp_inq *); 995 void sctp_inq_free(struct sctp_inq *); 996 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 997 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 998 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 999 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1000 1001 /* This is the structure we use to hold outbound chunks. You push 1002 * chunks in and they automatically pop out the other end as bundled 1003 * packets (it calls (*output_handler)()). 1004 * 1005 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1006 * and 8.2 of the v13 draft. 1007 * 1008 * It handles retransmissions. The connection to the timeout portion 1009 * of the state machine is through sctp_..._timeout() and timeout_handler. 1010 * 1011 * If you feed it SACKs, it will eat them. 1012 * 1013 * If you give it big chunks, it will fragment them. 1014 * 1015 * It assigns TSN's to data chunks. This happens at the last possible 1016 * instant before transmission. 1017 * 1018 * When free()'d, it empties itself out via output_handler(). 1019 */ 1020 struct sctp_outq { 1021 struct sctp_association *asoc; 1022 1023 /* Data pending that has never been transmitted. */ 1024 struct list_head out_chunk_list; 1025 1026 /* Stream scheduler being used */ 1027 struct sctp_sched_ops *sched; 1028 1029 unsigned int out_qlen; /* Total length of queued data chunks. */ 1030 1031 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1032 unsigned int error; 1033 1034 /* These are control chunks we want to send. */ 1035 struct list_head control_chunk_list; 1036 1037 /* These are chunks that have been sacked but are above the 1038 * CTSN, or cumulative tsn ack point. 1039 */ 1040 struct list_head sacked; 1041 1042 /* Put chunks on this list to schedule them for 1043 * retransmission. 1044 */ 1045 struct list_head retransmit; 1046 1047 /* Put chunks on this list to save them for FWD TSN processing as 1048 * they were abandoned. 1049 */ 1050 struct list_head abandoned; 1051 1052 /* How many unackd bytes do we have in-flight? */ 1053 __u32 outstanding_bytes; 1054 1055 /* Are we doing fast-rtx on this queue */ 1056 char fast_rtx; 1057 1058 /* Corked? */ 1059 char cork; 1060 }; 1061 1062 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1063 void sctp_outq_teardown(struct sctp_outq *); 1064 void sctp_outq_free(struct sctp_outq*); 1065 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1066 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1067 int sctp_outq_is_empty(const struct sctp_outq *); 1068 void sctp_outq_restart(struct sctp_outq *); 1069 1070 void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, 1071 enum sctp_retransmit_reason reason); 1072 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1073 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1074 void sctp_prsctp_prune(struct sctp_association *asoc, 1075 struct sctp_sndrcvinfo *sinfo, int msg_len); 1076 /* Uncork and flush an outqueue. */ 1077 static inline void sctp_outq_cork(struct sctp_outq *q) 1078 { 1079 q->cork = 1; 1080 } 1081 1082 /* SCTP skb control block. 1083 * sctp_input_cb is currently used on rx and sock rx queue 1084 */ 1085 struct sctp_input_cb { 1086 union { 1087 struct inet_skb_parm h4; 1088 #if IS_ENABLED(CONFIG_IPV6) 1089 struct inet6_skb_parm h6; 1090 #endif 1091 } header; 1092 struct sctp_chunk *chunk; 1093 struct sctp_af *af; 1094 }; 1095 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1096 1097 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1098 { 1099 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1100 1101 return chunk->head_skb ? : skb; 1102 } 1103 1104 /* These bind address data fields common between endpoints and associations */ 1105 struct sctp_bind_addr { 1106 1107 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1108 * 1109 * SCTP Port: The local SCTP port number the endpoint is 1110 * bound to. 1111 */ 1112 __u16 port; 1113 1114 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1115 * 1116 * Address List: The list of IP addresses that this instance 1117 * has bound. This information is passed to one's 1118 * peer(s) in INIT and INIT ACK chunks. 1119 */ 1120 struct list_head address_list; 1121 }; 1122 1123 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1124 void sctp_bind_addr_free(struct sctp_bind_addr *); 1125 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1126 const struct sctp_bind_addr *src, 1127 enum sctp_scope scope, gfp_t gfp, 1128 int flags); 1129 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1130 const struct sctp_bind_addr *src, 1131 gfp_t gfp); 1132 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1133 int new_size, __u8 addr_state, gfp_t gfp); 1134 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1135 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1136 struct sctp_sock *); 1137 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1138 struct sctp_sock *, struct sctp_sock *); 1139 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1140 const union sctp_addr *addr); 1141 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1142 const union sctp_addr *addrs, 1143 int addrcnt, 1144 struct sctp_sock *opt); 1145 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1146 int *addrs_len, 1147 gfp_t gfp); 1148 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1149 __u16 port, gfp_t gfp); 1150 1151 enum sctp_scope sctp_scope(const union sctp_addr *addr); 1152 int sctp_in_scope(struct net *net, const union sctp_addr *addr, 1153 const enum sctp_scope scope); 1154 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1155 int sctp_is_ep_boundall(struct sock *sk); 1156 1157 1158 /* What type of endpoint? */ 1159 enum sctp_endpoint_type { 1160 SCTP_EP_TYPE_SOCKET, 1161 SCTP_EP_TYPE_ASSOCIATION, 1162 }; 1163 1164 /* 1165 * A common base class to bridge the implmentation view of a 1166 * socket (usually listening) endpoint versus an association's 1167 * local endpoint. 1168 * This common structure is useful for several purposes: 1169 * 1) Common interface for lookup routines. 1170 * a) Subfunctions work for either endpoint or association 1171 * b) Single interface to lookup allows hiding the lookup lock rather 1172 * than acquiring it externally. 1173 * 2) Common interface for the inbound chunk handling/state machine. 1174 * 3) Common object handling routines for reference counting, etc. 1175 * 4) Disentangle association lookup from endpoint lookup, where we 1176 * do not have to find our endpoint to find our association. 1177 * 1178 */ 1179 1180 struct sctp_ep_common { 1181 /* Fields to help us manage our entries in the hash tables. */ 1182 struct hlist_node node; 1183 int hashent; 1184 1185 /* Runtime type information. What kind of endpoint is this? */ 1186 enum sctp_endpoint_type type; 1187 1188 /* Some fields to help us manage this object. 1189 * refcnt - Reference count access to this object. 1190 * dead - Do not attempt to use this object. 1191 */ 1192 refcount_t refcnt; 1193 bool dead; 1194 1195 /* What socket does this endpoint belong to? */ 1196 struct sock *sk; 1197 1198 /* This is where we receive inbound chunks. */ 1199 struct sctp_inq inqueue; 1200 1201 /* This substructure includes the defining parameters of the 1202 * endpoint: 1203 * bind_addr.port is our shared port number. 1204 * bind_addr.address_list is our set of local IP addresses. 1205 */ 1206 struct sctp_bind_addr bind_addr; 1207 }; 1208 1209 1210 /* RFC Section 1.4 Key Terms 1211 * 1212 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1213 * multi-homed host, an SCTP endpoint is represented to its peers as a 1214 * combination of a set of eligible destination transport addresses to 1215 * which SCTP packets can be sent and a set of eligible source 1216 * transport addresses from which SCTP packets can be received. 1217 * All transport addresses used by an SCTP endpoint must use the 1218 * same port number, but can use multiple IP addresses. A transport 1219 * address used by an SCTP endpoint must not be used by another 1220 * SCTP endpoint. In other words, a transport address is unique 1221 * to an SCTP endpoint. 1222 * 1223 * From an implementation perspective, each socket has one of these. 1224 * A TCP-style socket will have exactly one association on one of 1225 * these. An UDP-style socket will have multiple associations hanging 1226 * off one of these. 1227 */ 1228 1229 struct sctp_endpoint { 1230 /* Common substructure for endpoint and association. */ 1231 struct sctp_ep_common base; 1232 1233 /* Associations: A list of current associations and mappings 1234 * to the data consumers for each association. This 1235 * may be in the form of a hash table or other 1236 * implementation dependent structure. The data 1237 * consumers may be process identification 1238 * information such as file descriptors, named pipe 1239 * pointer, or table pointers dependent on how SCTP 1240 * is implemented. 1241 */ 1242 /* This is really a list of struct sctp_association entries. */ 1243 struct list_head asocs; 1244 1245 /* Secret Key: A secret key used by this endpoint to compute 1246 * the MAC. This SHOULD be a cryptographic quality 1247 * random number with a sufficient length. 1248 * Discussion in [RFC1750] can be helpful in 1249 * selection of the key. 1250 */ 1251 __u8 secret_key[SCTP_SECRET_SIZE]; 1252 1253 /* digest: This is a digest of the sctp cookie. This field is 1254 * only used on the receive path when we try to validate 1255 * that the cookie has not been tampered with. We put 1256 * this here so we pre-allocate this once and can re-use 1257 * on every receive. 1258 */ 1259 __u8 *digest; 1260 1261 /* sendbuf acct. policy. */ 1262 __u32 sndbuf_policy; 1263 1264 /* rcvbuf acct. policy. */ 1265 __u32 rcvbuf_policy; 1266 1267 /* SCTP AUTH: array of the HMACs that will be allocated 1268 * we need this per association so that we don't serialize 1269 */ 1270 struct crypto_shash **auth_hmacs; 1271 1272 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1273 struct sctp_hmac_algo_param *auth_hmacs_list; 1274 1275 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1276 struct sctp_chunks_param *auth_chunk_list; 1277 1278 /* SCTP-AUTH: endpoint shared keys */ 1279 struct list_head endpoint_shared_keys; 1280 __u16 active_key_id; 1281 __u8 auth_enable:1, 1282 prsctp_enable:1, 1283 reconf_enable:1; 1284 1285 __u8 strreset_enable; 1286 }; 1287 1288 /* Recover the outter endpoint structure. */ 1289 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1290 { 1291 struct sctp_endpoint *ep; 1292 1293 ep = container_of(base, struct sctp_endpoint, base); 1294 return ep; 1295 } 1296 1297 /* These are function signatures for manipulating endpoints. */ 1298 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1299 void sctp_endpoint_free(struct sctp_endpoint *); 1300 void sctp_endpoint_put(struct sctp_endpoint *); 1301 void sctp_endpoint_hold(struct sctp_endpoint *); 1302 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1303 struct sctp_association *sctp_endpoint_lookup_assoc( 1304 const struct sctp_endpoint *ep, 1305 const union sctp_addr *paddr, 1306 struct sctp_transport **); 1307 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1308 const union sctp_addr *); 1309 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1310 struct net *, const union sctp_addr *); 1311 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1312 const union sctp_addr *paddr); 1313 1314 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1315 const struct sctp_association *asoc, 1316 enum sctp_cid cid, struct sctp_init_chunk *peer_init, 1317 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1318 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1319 const union sctp_addr *peer, 1320 struct sctp_init_chunk *init, gfp_t gfp); 1321 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1322 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1323 1324 struct sctp_inithdr_host { 1325 __u32 init_tag; 1326 __u32 a_rwnd; 1327 __u16 num_outbound_streams; 1328 __u16 num_inbound_streams; 1329 __u32 initial_tsn; 1330 }; 1331 1332 struct sctp_stream_priorities { 1333 /* List of priorities scheduled */ 1334 struct list_head prio_sched; 1335 /* List of streams scheduled */ 1336 struct list_head active; 1337 /* The next stream stream in line */ 1338 struct sctp_stream_out_ext *next; 1339 __u16 prio; 1340 }; 1341 1342 struct sctp_stream_out_ext { 1343 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1344 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1345 struct list_head outq; /* chunks enqueued by this stream */ 1346 union { 1347 struct { 1348 /* Scheduled streams list */ 1349 struct list_head prio_list; 1350 struct sctp_stream_priorities *prio_head; 1351 }; 1352 /* Fields used by RR scheduler */ 1353 struct { 1354 struct list_head rr_list; 1355 }; 1356 }; 1357 }; 1358 1359 struct sctp_stream_out { 1360 __u16 ssn; 1361 __u8 state; 1362 struct sctp_stream_out_ext *ext; 1363 }; 1364 1365 struct sctp_stream_in { 1366 __u16 ssn; 1367 }; 1368 1369 struct sctp_stream { 1370 struct sctp_stream_out *out; 1371 struct sctp_stream_in *in; 1372 __u16 outcnt; 1373 __u16 incnt; 1374 /* Current stream being sent, if any */ 1375 struct sctp_stream_out *out_curr; 1376 union { 1377 /* Fields used by priority scheduler */ 1378 struct { 1379 /* List of priorities scheduled */ 1380 struct list_head prio_list; 1381 }; 1382 /* Fields used by RR scheduler */ 1383 struct { 1384 /* List of streams scheduled */ 1385 struct list_head rr_list; 1386 /* The next stream stream in line */ 1387 struct sctp_stream_out_ext *rr_next; 1388 }; 1389 }; 1390 }; 1391 1392 #define SCTP_STREAM_CLOSED 0x00 1393 #define SCTP_STREAM_OPEN 0x01 1394 1395 /* SCTP_GET_ASSOC_STATS counters */ 1396 struct sctp_priv_assoc_stats { 1397 /* Maximum observed rto in the association during subsequent 1398 * observations. Value is set to 0 if no RTO measurement took place 1399 * The transport where the max_rto was observed is returned in 1400 * obs_rto_ipaddr 1401 */ 1402 struct sockaddr_storage obs_rto_ipaddr; 1403 __u64 max_obs_rto; 1404 /* Total In and Out SACKs received and sent */ 1405 __u64 isacks; 1406 __u64 osacks; 1407 /* Total In and Out packets received and sent */ 1408 __u64 opackets; 1409 __u64 ipackets; 1410 /* Total retransmitted chunks */ 1411 __u64 rtxchunks; 1412 /* TSN received > next expected */ 1413 __u64 outofseqtsns; 1414 /* Duplicate Chunks received */ 1415 __u64 idupchunks; 1416 /* Gap Ack Blocks received */ 1417 __u64 gapcnt; 1418 /* Unordered data chunks sent and received */ 1419 __u64 ouodchunks; 1420 __u64 iuodchunks; 1421 /* Ordered data chunks sent and received */ 1422 __u64 oodchunks; 1423 __u64 iodchunks; 1424 /* Control chunks sent and received */ 1425 __u64 octrlchunks; 1426 __u64 ictrlchunks; 1427 }; 1428 1429 /* RFC2960 1430 * 1431 * 12. Recommended Transmission Control Block (TCB) Parameters 1432 * 1433 * This section details a recommended set of parameters that should 1434 * be contained within the TCB for an implementation. This section is 1435 * for illustrative purposes and should not be deemed as requirements 1436 * on an implementation or as an exhaustive list of all parameters 1437 * inside an SCTP TCB. Each implementation may need its own additional 1438 * parameters for optimization. 1439 */ 1440 1441 1442 /* Here we have information about each individual association. */ 1443 struct sctp_association { 1444 1445 /* A base structure common to endpoint and association. 1446 * In this context, it represents the associations's view 1447 * of the local endpoint of the association. 1448 */ 1449 struct sctp_ep_common base; 1450 1451 /* Associations on the same socket. */ 1452 struct list_head asocs; 1453 1454 /* association id. */ 1455 sctp_assoc_t assoc_id; 1456 1457 /* This is our parent endpoint. */ 1458 struct sctp_endpoint *ep; 1459 1460 /* These are those association elements needed in the cookie. */ 1461 struct sctp_cookie c; 1462 1463 /* This is all information about our peer. */ 1464 struct { 1465 /* transport_addr_list 1466 * 1467 * Peer : A list of SCTP transport addresses that the 1468 * Transport : peer is bound to. This information is derived 1469 * Address : from the INIT or INIT ACK and is used to 1470 * List : associate an inbound packet with a given 1471 * : association. Normally this information is 1472 * : hashed or keyed for quick lookup and access 1473 * : of the TCB. 1474 * : The list is also initialized with the list 1475 * : of addresses passed with the sctp_connectx() 1476 * : call. 1477 * 1478 * It is a list of SCTP_transport's. 1479 */ 1480 struct list_head transport_addr_list; 1481 1482 /* rwnd 1483 * 1484 * Peer Rwnd : Current calculated value of the peer's rwnd. 1485 */ 1486 __u32 rwnd; 1487 1488 /* transport_count 1489 * 1490 * Peer : A count of the number of peer addresses 1491 * Transport : in the Peer Transport Address List. 1492 * Address : 1493 * Count : 1494 */ 1495 __u16 transport_count; 1496 1497 /* port 1498 * The transport layer port number. 1499 */ 1500 __u16 port; 1501 1502 /* primary_path 1503 * 1504 * Primary : This is the current primary destination 1505 * Path : transport address of the peer endpoint. It 1506 * : may also specify a source transport address 1507 * : on this endpoint. 1508 * 1509 * All of these paths live on transport_addr_list. 1510 * 1511 * At the bakeoffs, we discovered that the intent of 1512 * primaryPath is that it only changes when the ULP 1513 * asks to have it changed. We add the activePath to 1514 * designate the connection we are currently using to 1515 * transmit new data and most control chunks. 1516 */ 1517 struct sctp_transport *primary_path; 1518 1519 /* Cache the primary path address here, when we 1520 * need a an address for msg_name. 1521 */ 1522 union sctp_addr primary_addr; 1523 1524 /* active_path 1525 * The path that we are currently using to 1526 * transmit new data and most control chunks. 1527 */ 1528 struct sctp_transport *active_path; 1529 1530 /* retran_path 1531 * 1532 * RFC2960 6.4 Multi-homed SCTP Endpoints 1533 * ... 1534 * Furthermore, when its peer is multi-homed, an 1535 * endpoint SHOULD try to retransmit a chunk to an 1536 * active destination transport address that is 1537 * different from the last destination address to 1538 * which the DATA chunk was sent. 1539 */ 1540 struct sctp_transport *retran_path; 1541 1542 /* Pointer to last transport I have sent on. */ 1543 struct sctp_transport *last_sent_to; 1544 1545 /* This is the last transport I have received DATA on. */ 1546 struct sctp_transport *last_data_from; 1547 1548 /* 1549 * Mapping An array of bits or bytes indicating which out of 1550 * Array order TSN's have been received (relative to the 1551 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1552 * order packets have been received, this array 1553 * will be set to all zero. This structure may be 1554 * in the form of a circular buffer or bit array. 1555 * 1556 * Last Rcvd : This is the last TSN received in 1557 * TSN : sequence. This value is set initially by 1558 * : taking the peer's Initial TSN, received in 1559 * : the INIT or INIT ACK chunk, and subtracting 1560 * : one from it. 1561 * 1562 * Throughout most of the specification this is called the 1563 * "Cumulative TSN ACK Point". In this case, we 1564 * ignore the advice in 12.2 in favour of the term 1565 * used in the bulk of the text. This value is hidden 1566 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1567 */ 1568 struct sctp_tsnmap tsn_map; 1569 1570 /* This mask is used to disable sending the ASCONF chunk 1571 * with specified parameter to peer. 1572 */ 1573 __be16 addip_disabled_mask; 1574 1575 /* These are capabilities which our peer advertised. */ 1576 __u8 ecn_capable:1, /* Can peer do ECN? */ 1577 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1578 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1579 hostname_address:1, /* Peer understands DNS addresses? */ 1580 asconf_capable:1, /* Does peer support ADDIP? */ 1581 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1582 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1583 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1584 1585 /* sack_needed : This flag indicates if the next received 1586 * : packet is to be responded to with a 1587 * : SACK. This is initialized to 0. When a packet 1588 * : is received sack_cnt is incremented. If this value 1589 * : reaches 2 or more, a SACK is sent and the 1590 * : value is reset to 0. Note: This is used only 1591 * : when no DATA chunks are received out of 1592 * : order. When DATA chunks are out of order, 1593 * : SACK's are not delayed (see Section 6). 1594 */ 1595 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1596 sack_generation:1, 1597 zero_window_announced:1; 1598 __u32 sack_cnt; 1599 1600 __u32 adaptation_ind; /* Adaptation Code point. */ 1601 1602 struct sctp_inithdr_host i; 1603 void *cookie; 1604 int cookie_len; 1605 1606 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1607 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1608 * Initial TSN Value minus 1 1609 */ 1610 __u32 addip_serial; 1611 1612 /* SCTP-AUTH: We need to know pears random number, hmac list 1613 * and authenticated chunk list. All that is part of the 1614 * cookie and these are just pointers to those locations 1615 */ 1616 struct sctp_random_param *peer_random; 1617 struct sctp_chunks_param *peer_chunks; 1618 struct sctp_hmac_algo_param *peer_hmacs; 1619 } peer; 1620 1621 /* State : A state variable indicating what state the 1622 * : association is in, i.e. COOKIE-WAIT, 1623 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1624 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1625 * 1626 * Note: No "CLOSED" state is illustrated since if a 1627 * association is "CLOSED" its TCB SHOULD be removed. 1628 * 1629 * In this implementation we DO have a CLOSED 1630 * state which is used during initiation and shutdown. 1631 * 1632 * State takes values from SCTP_STATE_*. 1633 */ 1634 enum sctp_state state; 1635 1636 /* Overall : The overall association error count. 1637 * Error Count : [Clear this any time I get something.] 1638 */ 1639 int overall_error_count; 1640 1641 /* The cookie life I award for any cookie. */ 1642 ktime_t cookie_life; 1643 1644 /* These are the association's initial, max, and min RTO values. 1645 * These values will be initialized by system defaults, but can 1646 * be modified via the SCTP_RTOINFO socket option. 1647 */ 1648 unsigned long rto_initial; 1649 unsigned long rto_max; 1650 unsigned long rto_min; 1651 1652 /* Maximum number of new data packets that can be sent in a burst. */ 1653 int max_burst; 1654 1655 /* This is the max_retrans value for the association. This value will 1656 * be initialized initialized from system defaults, but can be 1657 * modified by the SCTP_ASSOCINFO socket option. 1658 */ 1659 int max_retrans; 1660 1661 /* This is the partially failed retrans value for the transport 1662 * and will be initialized from the assocs value. This can be 1663 * changed using the SCTP_PEER_ADDR_THLDS socket option 1664 */ 1665 int pf_retrans; 1666 1667 /* Maximum number of times the endpoint will retransmit INIT */ 1668 __u16 max_init_attempts; 1669 1670 /* How many times have we resent an INIT? */ 1671 __u16 init_retries; 1672 1673 /* The largest timeout or RTO value to use in attempting an INIT */ 1674 unsigned long max_init_timeo; 1675 1676 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1677 * the destination address every heartbeat interval. This value 1678 * will be inherited by all new transports. 1679 */ 1680 unsigned long hbinterval; 1681 1682 /* This is the max_retrans value for new transports in the 1683 * association. 1684 */ 1685 __u16 pathmaxrxt; 1686 1687 /* Flag that path mtu update is pending */ 1688 __u8 pmtu_pending; 1689 1690 /* Association : The smallest PMTU discovered for all of the 1691 * PMTU : peer's transport addresses. 1692 */ 1693 __u32 pathmtu; 1694 1695 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1696 __u32 param_flags; 1697 1698 __u32 sackfreq; 1699 /* SACK delay timeout */ 1700 unsigned long sackdelay; 1701 1702 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1703 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1704 1705 /* Transport to which SHUTDOWN chunk was last sent. */ 1706 struct sctp_transport *shutdown_last_sent_to; 1707 1708 /* Transport to which INIT chunk was last sent. */ 1709 struct sctp_transport *init_last_sent_to; 1710 1711 /* How many times have we resent a SHUTDOWN */ 1712 int shutdown_retries; 1713 1714 /* Next TSN : The next TSN number to be assigned to a new 1715 * : DATA chunk. This is sent in the INIT or INIT 1716 * : ACK chunk to the peer and incremented each 1717 * : time a DATA chunk is assigned a TSN 1718 * : (normally just prior to transmit or during 1719 * : fragmentation). 1720 */ 1721 __u32 next_tsn; 1722 1723 /* 1724 * Last Rcvd : This is the last TSN received in sequence. This value 1725 * TSN : is set initially by taking the peer's Initial TSN, 1726 * : received in the INIT or INIT ACK chunk, and 1727 * : subtracting one from it. 1728 * 1729 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1730 */ 1731 1732 __u32 ctsn_ack_point; 1733 1734 /* PR-SCTP Advanced.Peer.Ack.Point */ 1735 __u32 adv_peer_ack_point; 1736 1737 /* Highest TSN that is acknowledged by incoming SACKs. */ 1738 __u32 highest_sacked; 1739 1740 /* TSN marking the fast recovery exit point */ 1741 __u32 fast_recovery_exit; 1742 1743 /* Flag to track the current fast recovery state */ 1744 __u8 fast_recovery; 1745 1746 /* The number of unacknowledged data chunks. Reported through 1747 * the SCTP_STATUS sockopt. 1748 */ 1749 __u16 unack_data; 1750 1751 /* The total number of data chunks that we've had to retransmit 1752 * as the result of a T3 timer expiration 1753 */ 1754 __u32 rtx_data_chunks; 1755 1756 /* This is the association's receive buffer space. This value is used 1757 * to set a_rwnd field in an INIT or a SACK chunk. 1758 */ 1759 __u32 rwnd; 1760 1761 /* This is the last advertised value of rwnd over a SACK chunk. */ 1762 __u32 a_rwnd; 1763 1764 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1765 * to slop over a maximum of the association's frag_point. 1766 */ 1767 __u32 rwnd_over; 1768 1769 /* Keeps treack of rwnd pressure. This happens when we have 1770 * a window, but not recevie buffer (i.e small packets). This one 1771 * is releases slowly (1 PMTU at a time ). 1772 */ 1773 __u32 rwnd_press; 1774 1775 /* This is the sndbuf size in use for the association. 1776 * This corresponds to the sndbuf size for the association, 1777 * as specified in the sk->sndbuf. 1778 */ 1779 int sndbuf_used; 1780 1781 /* This is the amount of memory that this association has allocated 1782 * in the receive path at any given time. 1783 */ 1784 atomic_t rmem_alloc; 1785 1786 /* This is the wait queue head for send requests waiting on 1787 * the association sndbuf space. 1788 */ 1789 wait_queue_head_t wait; 1790 1791 /* The message size at which SCTP fragmentation will occur. */ 1792 __u32 frag_point; 1793 __u32 user_frag; 1794 1795 /* Counter used to count INIT errors. */ 1796 int init_err_counter; 1797 1798 /* Count the number of INIT cycles (for doubling timeout). */ 1799 int init_cycle; 1800 1801 /* Default send parameters. */ 1802 __u16 default_stream; 1803 __u16 default_flags; 1804 __u32 default_ppid; 1805 __u32 default_context; 1806 __u32 default_timetolive; 1807 1808 /* Default receive parameters */ 1809 __u32 default_rcv_context; 1810 1811 /* Stream arrays */ 1812 struct sctp_stream stream; 1813 1814 /* All outbound chunks go through this structure. */ 1815 struct sctp_outq outqueue; 1816 1817 /* A smart pipe that will handle reordering and fragmentation, 1818 * as well as handle passing events up to the ULP. 1819 */ 1820 struct sctp_ulpq ulpq; 1821 1822 /* Last TSN that caused an ECNE Chunk to be sent. */ 1823 __u32 last_ecne_tsn; 1824 1825 /* Last TSN that caused a CWR Chunk to be sent. */ 1826 __u32 last_cwr_tsn; 1827 1828 /* How many duplicated TSNs have we seen? */ 1829 int numduptsns; 1830 1831 /* These are to support 1832 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1833 * and Enforcement of Flow and Message Limits" 1834 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1835 * or "ADDIP" for short. 1836 */ 1837 1838 1839 1840 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1841 * 1842 * R1) One and only one ASCONF Chunk MAY be in transit and 1843 * unacknowledged at any one time. If a sender, after sending 1844 * an ASCONF chunk, decides it needs to transfer another 1845 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1846 * returns from the previous ASCONF Chunk before sending a 1847 * subsequent ASCONF. Note this restriction binds each side, 1848 * so at any time two ASCONF may be in-transit on any given 1849 * association (one sent from each endpoint). 1850 * 1851 * [This is our one-and-only-one ASCONF in flight. If we do 1852 * not have an ASCONF in flight, this is NULL.] 1853 */ 1854 struct sctp_chunk *addip_last_asconf; 1855 1856 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1857 * 1858 * This is needed to implement itmes E1 - E4 of the updated 1859 * spec. Here is the justification: 1860 * 1861 * Since the peer may bundle multiple ASCONF chunks toward us, 1862 * we now need the ability to cache multiple ACKs. The section 1863 * describes in detail how they are cached and cleaned up. 1864 */ 1865 struct list_head asconf_ack_list; 1866 1867 /* These ASCONF chunks are waiting to be sent. 1868 * 1869 * These chunaks can't be pushed to outqueue until receiving 1870 * ASCONF_ACK for the previous ASCONF indicated by 1871 * addip_last_asconf, so as to guarantee that only one ASCONF 1872 * is in flight at any time. 1873 * 1874 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1875 * 1876 * In defining the ASCONF Chunk transfer procedures, it is 1877 * essential that these transfers MUST NOT cause congestion 1878 * within the network. To achieve this, we place these 1879 * restrictions on the transfer of ASCONF Chunks: 1880 * 1881 * R1) One and only one ASCONF Chunk MAY be in transit and 1882 * unacknowledged at any one time. If a sender, after sending 1883 * an ASCONF chunk, decides it needs to transfer another 1884 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1885 * returns from the previous ASCONF Chunk before sending a 1886 * subsequent ASCONF. Note this restriction binds each side, 1887 * so at any time two ASCONF may be in-transit on any given 1888 * association (one sent from each endpoint). 1889 * 1890 * 1891 * [I really think this is EXACTLY the sort of intelligence 1892 * which already resides in sctp_outq. Please move this 1893 * queue and its supporting logic down there. --piggy] 1894 */ 1895 struct list_head addip_chunk_list; 1896 1897 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1898 * 1899 * A2) A serial number should be assigned to the Chunk. The 1900 * serial number SHOULD be a monotonically increasing 1901 * number. The serial number SHOULD be initialized at 1902 * the start of the association to the same value as the 1903 * Initial TSN and every time a new ASCONF chunk is created 1904 * it is incremented by one after assigning the serial number 1905 * to the newly created chunk. 1906 * 1907 * ADDIP 1908 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1909 * 1910 * Serial Number : 32 bits (unsigned integer) 1911 * 1912 * This value represents a Serial Number for the ASCONF 1913 * Chunk. The valid range of Serial Number is from 0 to 1914 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1915 * after reaching 4294967295. 1916 */ 1917 __u32 addip_serial; 1918 int src_out_of_asoc_ok; 1919 union sctp_addr *asconf_addr_del_pending; 1920 struct sctp_transport *new_transport; 1921 1922 /* SCTP AUTH: list of the endpoint shared keys. These 1923 * keys are provided out of band by the user applicaton 1924 * and can't change during the lifetime of the association 1925 */ 1926 struct list_head endpoint_shared_keys; 1927 1928 /* SCTP AUTH: 1929 * The current generated assocaition shared key (secret) 1930 */ 1931 struct sctp_auth_bytes *asoc_shared_key; 1932 1933 /* SCTP AUTH: hmac id of the first peer requested algorithm 1934 * that we support. 1935 */ 1936 __u16 default_hmac_id; 1937 1938 __u16 active_key_id; 1939 1940 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1941 temp:1, /* Is it a temporary association? */ 1942 force_delay:1, 1943 prsctp_enable:1, 1944 reconf_enable:1; 1945 1946 __u8 strreset_enable; 1947 __u8 strreset_outstanding; /* request param count on the fly */ 1948 1949 __u32 strreset_outseq; /* Update after receiving response */ 1950 __u32 strreset_inseq; /* Update after receiving request */ 1951 __u32 strreset_result[2]; /* save the results of last 2 responses */ 1952 1953 struct sctp_chunk *strreset_chunk; /* save request chunk */ 1954 1955 struct sctp_priv_assoc_stats stats; 1956 1957 int sent_cnt_removable; 1958 1959 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1960 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1961 }; 1962 1963 1964 /* An eyecatcher for determining if we are really looking at an 1965 * association data structure. 1966 */ 1967 enum { 1968 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1969 }; 1970 1971 /* Recover the outter association structure. */ 1972 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1973 { 1974 struct sctp_association *asoc; 1975 1976 asoc = container_of(base, struct sctp_association, base); 1977 return asoc; 1978 } 1979 1980 /* These are function signatures for manipulating associations. */ 1981 1982 1983 struct sctp_association * 1984 sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, 1985 enum sctp_scope scope, gfp_t gfp); 1986 void sctp_association_free(struct sctp_association *); 1987 void sctp_association_put(struct sctp_association *); 1988 void sctp_association_hold(struct sctp_association *); 1989 1990 struct sctp_transport *sctp_assoc_choose_alter_transport( 1991 struct sctp_association *, struct sctp_transport *); 1992 void sctp_assoc_update_retran_path(struct sctp_association *); 1993 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1994 const union sctp_addr *); 1995 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1996 const union sctp_addr *laddr); 1997 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1998 const union sctp_addr *address, 1999 const gfp_t gfp, 2000 const int peer_state); 2001 void sctp_assoc_del_peer(struct sctp_association *asoc, 2002 const union sctp_addr *addr); 2003 void sctp_assoc_rm_peer(struct sctp_association *asoc, 2004 struct sctp_transport *peer); 2005 void sctp_assoc_control_transport(struct sctp_association *asoc, 2006 struct sctp_transport *transport, 2007 enum sctp_transport_cmd command, 2008 sctp_sn_error_t error); 2009 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 2010 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 2011 struct net *, 2012 const union sctp_addr *, 2013 const union sctp_addr *); 2014 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 2015 int sctp_assoc_update(struct sctp_association *old, 2016 struct sctp_association *new); 2017 2018 __u32 sctp_association_get_next_tsn(struct sctp_association *); 2019 2020 void sctp_assoc_sync_pmtu(struct sctp_association *asoc); 2021 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 2022 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 2023 void sctp_assoc_set_primary(struct sctp_association *, 2024 struct sctp_transport *); 2025 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 2026 struct sctp_transport *); 2027 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, 2028 enum sctp_scope scope, gfp_t gfp); 2029 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 2030 struct sctp_cookie*, 2031 gfp_t gfp); 2032 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 2033 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 2034 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 2035 const struct sctp_association *asoc, 2036 __be32 serial); 2037 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 2038 2039 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 2040 const union sctp_addr *ss2); 2041 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2042 2043 /* A convenience structure to parse out SCTP specific CMSGs. */ 2044 struct sctp_cmsgs { 2045 struct sctp_initmsg *init; 2046 struct sctp_sndrcvinfo *srinfo; 2047 struct sctp_sndinfo *sinfo; 2048 }; 2049 2050 /* Structure for tracking memory objects */ 2051 struct sctp_dbg_objcnt_entry { 2052 char *label; 2053 atomic_t *counter; 2054 }; 2055 2056 #endif /* __sctp_structs_h__ */ 2057