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 strm_interleave:1, 221 recvrcvinfo:1, 222 recvnxtinfo:1, 223 data_ready_signalled:1; 224 225 atomic_t pd_mode; 226 /* Receive to here while partial delivery is in effect. */ 227 struct sk_buff_head pd_lobby; 228 229 /* These must be the last fields, as they will skipped on copies, 230 * like on accept and peeloff operations 231 */ 232 struct list_head auto_asconf_list; 233 int do_auto_asconf; 234 }; 235 236 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 237 { 238 return (struct sctp_sock *)sk; 239 } 240 241 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 242 { 243 return (struct sock *)sp; 244 } 245 246 #if IS_ENABLED(CONFIG_IPV6) 247 struct sctp6_sock { 248 struct sctp_sock sctp; 249 struct ipv6_pinfo inet6; 250 }; 251 #endif /* CONFIG_IPV6 */ 252 253 254 /* This is our APPLICATION-SPECIFIC state cookie. 255 * THIS IS NOT DICTATED BY THE SPECIFICATION. 256 */ 257 /* These are the parts of an association which we send in the cookie. 258 * Most of these are straight out of: 259 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 260 * 261 */ 262 263 struct sctp_cookie { 264 265 /* My : Tag expected in every inbound packet and sent 266 * Verification: in the INIT or INIT ACK chunk. 267 * Tag : 268 */ 269 __u32 my_vtag; 270 271 /* Peer's : Tag expected in every outbound packet except 272 * Verification: in the INIT chunk. 273 * Tag : 274 */ 275 __u32 peer_vtag; 276 277 /* The rest of these are not from the spec, but really need to 278 * be in the cookie. 279 */ 280 281 /* My Tie Tag : Assist in discovering a restarting association. */ 282 __u32 my_ttag; 283 284 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 285 __u32 peer_ttag; 286 287 /* When does this cookie expire? */ 288 ktime_t expiration; 289 290 /* Number of inbound/outbound streams which are set 291 * and negotiated during the INIT process. 292 */ 293 __u16 sinit_num_ostreams; 294 __u16 sinit_max_instreams; 295 296 /* This is the first sequence number I used. */ 297 __u32 initial_tsn; 298 299 /* This holds the originating address of the INIT packet. */ 300 union sctp_addr peer_addr; 301 302 /* IG Section 2.35.3 303 * Include the source port of the INIT-ACK 304 */ 305 __u16 my_port; 306 307 __u8 prsctp_capable; 308 309 /* Padding for future use */ 310 __u8 padding; 311 312 __u32 adaptation_ind; 313 314 __u8 auth_random[sizeof(struct sctp_paramhdr) + 315 SCTP_AUTH_RANDOM_LENGTH]; 316 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 317 __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; 318 319 /* This is a shim for my peer's INIT packet, followed by 320 * a copy of the raw address list of the association. 321 * The length of the raw address list is saved in the 322 * raw_addr_list_len field, which will be used at the time when 323 * the association TCB is re-constructed from the cookie. 324 */ 325 __u32 raw_addr_list_len; 326 struct sctp_init_chunk peer_init[0]; 327 }; 328 329 330 /* The format of our cookie that we send to our peer. */ 331 struct sctp_signed_cookie { 332 __u8 signature[SCTP_SECRET_SIZE]; 333 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 334 struct sctp_cookie c; 335 } __packed; 336 337 /* This is another convenience type to allocate memory for address 338 * params for the maximum size and pass such structures around 339 * internally. 340 */ 341 union sctp_addr_param { 342 struct sctp_paramhdr p; 343 struct sctp_ipv4addr_param v4; 344 struct sctp_ipv6addr_param v6; 345 }; 346 347 /* A convenience type to allow walking through the various 348 * parameters and avoid casting all over the place. 349 */ 350 union sctp_params { 351 void *v; 352 struct sctp_paramhdr *p; 353 struct sctp_cookie_preserve_param *life; 354 struct sctp_hostname_param *dns; 355 struct sctp_cookie_param *cookie; 356 struct sctp_supported_addrs_param *sat; 357 struct sctp_ipv4addr_param *v4; 358 struct sctp_ipv6addr_param *v6; 359 union sctp_addr_param *addr; 360 struct sctp_adaptation_ind_param *aind; 361 struct sctp_supported_ext_param *ext; 362 struct sctp_random_param *random; 363 struct sctp_chunks_param *chunks; 364 struct sctp_hmac_algo_param *hmac_algo; 365 struct sctp_addip_param *addip; 366 }; 367 368 /* RFC 2960. Section 3.3.5 Heartbeat. 369 * Heartbeat Information: variable length 370 * The Sender-specific Heartbeat Info field should normally include 371 * information about the sender's current time when this HEARTBEAT 372 * chunk is sent and the destination transport address to which this 373 * HEARTBEAT is sent (see Section 8.3). 374 */ 375 struct sctp_sender_hb_info { 376 struct sctp_paramhdr param_hdr; 377 union sctp_addr daddr; 378 unsigned long sent_at; 379 __u64 hb_nonce; 380 }; 381 382 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 383 gfp_t gfp); 384 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid); 385 void sctp_stream_free(struct sctp_stream *stream); 386 void sctp_stream_clear(struct sctp_stream *stream); 387 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); 388 389 /* What is the current SSN number for this stream? */ 390 #define sctp_ssn_peek(stream, type, sid) \ 391 ((stream)->type[sid].ssn) 392 393 /* Return the next SSN number for this stream. */ 394 #define sctp_ssn_next(stream, type, sid) \ 395 ((stream)->type[sid].ssn++) 396 397 /* Skip over this ssn and all below. */ 398 #define sctp_ssn_skip(stream, type, sid, ssn) \ 399 ((stream)->type[sid].ssn = ssn + 1) 400 401 /* 402 * Pointers to address related SCTP functions. 403 * (i.e. things that depend on the address family.) 404 */ 405 struct sctp_af { 406 int (*sctp_xmit) (struct sk_buff *skb, 407 struct sctp_transport *); 408 int (*setsockopt) (struct sock *sk, 409 int level, 410 int optname, 411 char __user *optval, 412 unsigned int optlen); 413 int (*getsockopt) (struct sock *sk, 414 int level, 415 int optname, 416 char __user *optval, 417 int __user *optlen); 418 int (*compat_setsockopt) (struct sock *sk, 419 int level, 420 int optname, 421 char __user *optval, 422 unsigned int optlen); 423 int (*compat_getsockopt) (struct sock *sk, 424 int level, 425 int optname, 426 char __user *optval, 427 int __user *optlen); 428 void (*get_dst) (struct sctp_transport *t, 429 union sctp_addr *saddr, 430 struct flowi *fl, 431 struct sock *sk); 432 void (*get_saddr) (struct sctp_sock *sk, 433 struct sctp_transport *t, 434 struct flowi *fl); 435 void (*copy_addrlist) (struct list_head *, 436 struct net_device *); 437 int (*cmp_addr) (const union sctp_addr *addr1, 438 const union sctp_addr *addr2); 439 void (*addr_copy) (union sctp_addr *dst, 440 union sctp_addr *src); 441 void (*from_skb) (union sctp_addr *, 442 struct sk_buff *skb, 443 int saddr); 444 void (*from_sk) (union sctp_addr *, 445 struct sock *sk); 446 void (*from_addr_param) (union sctp_addr *, 447 union sctp_addr_param *, 448 __be16 port, int iif); 449 int (*to_addr_param) (const union sctp_addr *, 450 union sctp_addr_param *); 451 int (*addr_valid) (union sctp_addr *, 452 struct sctp_sock *, 453 const struct sk_buff *); 454 enum sctp_scope (*scope)(union sctp_addr *); 455 void (*inaddr_any) (union sctp_addr *, __be16); 456 int (*is_any) (const union sctp_addr *); 457 int (*available) (union sctp_addr *, 458 struct sctp_sock *); 459 int (*skb_iif) (const struct sk_buff *sk); 460 int (*is_ce) (const struct sk_buff *sk); 461 void (*seq_dump_addr)(struct seq_file *seq, 462 union sctp_addr *addr); 463 void (*ecn_capable)(struct sock *sk); 464 __u16 net_header_len; 465 int sockaddr_len; 466 sa_family_t sa_family; 467 struct list_head list; 468 }; 469 470 struct sctp_af *sctp_get_af_specific(sa_family_t); 471 int sctp_register_af(struct sctp_af *); 472 473 /* Protocol family functions. */ 474 struct sctp_pf { 475 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 476 void (*skb_msgname) (struct sk_buff *, char *, int *); 477 int (*af_supported) (sa_family_t, struct sctp_sock *); 478 int (*cmp_addr) (const union sctp_addr *, 479 const union sctp_addr *, 480 struct sctp_sock *); 481 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 482 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 483 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 484 struct sock *(*create_accept_sk) (struct sock *sk, 485 struct sctp_association *asoc, 486 bool kern); 487 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 488 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 489 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 490 struct sctp_af *af; 491 }; 492 493 494 /* Structure to track chunk fragments that have been acked, but peer 495 * fragments of the same message have not. 496 */ 497 struct sctp_datamsg { 498 /* Chunks waiting to be submitted to lower layer. */ 499 struct list_head chunks; 500 /* Reference counting. */ 501 refcount_t refcnt; 502 /* When is this message no longer interesting to the peer? */ 503 unsigned long expires_at; 504 /* Did the messenge fail to send? */ 505 int send_error; 506 u8 send_failed:1, 507 can_delay:1, /* should this message be Nagle delayed */ 508 abandoned:1; /* should this message be abandoned */ 509 }; 510 511 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 512 struct sctp_sndrcvinfo *, 513 struct iov_iter *); 514 void sctp_datamsg_free(struct sctp_datamsg *); 515 void sctp_datamsg_put(struct sctp_datamsg *); 516 void sctp_chunk_fail(struct sctp_chunk *, int error); 517 int sctp_chunk_abandoned(struct sctp_chunk *); 518 519 /* RFC2960 1.4 Key Terms 520 * 521 * o Chunk: A unit of information within an SCTP packet, consisting of 522 * a chunk header and chunk-specific content. 523 * 524 * As a matter of convenience, we remember the SCTP common header for 525 * each chunk as well as a few other header pointers... 526 */ 527 struct sctp_chunk { 528 struct list_head list; 529 530 refcount_t refcnt; 531 532 /* How many times this chunk have been sent, for prsctp RTX policy */ 533 int sent_count; 534 535 union { 536 /* This is our link to the per-transport transmitted list. */ 537 struct list_head transmitted_list; 538 /* List in specific stream outq */ 539 struct list_head stream_list; 540 }; 541 542 /* This field is used by chunks that hold fragmented data. 543 * For the first fragment this is the list that holds the rest of 544 * fragments. For the remaining fragments, this is the link to the 545 * frag_list maintained in the first fragment. 546 */ 547 struct list_head frag_list; 548 549 /* This points to the sk_buff containing the actual data. */ 550 struct sk_buff *skb; 551 552 /* In case of GSO packets, this will store the head one */ 553 struct sk_buff *head_skb; 554 555 /* These are the SCTP headers by reverse order in a packet. 556 * Note that some of these may happen more than once. In that 557 * case, we point at the "current" one, whatever that means 558 * for that level of header. 559 */ 560 561 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 562 union sctp_params param_hdr; 563 union { 564 __u8 *v; 565 struct sctp_datahdr *data_hdr; 566 struct sctp_inithdr *init_hdr; 567 struct sctp_sackhdr *sack_hdr; 568 struct sctp_heartbeathdr *hb_hdr; 569 struct sctp_sender_hb_info *hbs_hdr; 570 struct sctp_shutdownhdr *shutdown_hdr; 571 struct sctp_signed_cookie *cookie_hdr; 572 struct sctp_ecnehdr *ecne_hdr; 573 struct sctp_cwrhdr *ecn_cwr_hdr; 574 struct sctp_errhdr *err_hdr; 575 struct sctp_addiphdr *addip_hdr; 576 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 577 struct sctp_authhdr *auth_hdr; 578 struct sctp_idatahdr *idata_hdr; 579 } subh; 580 581 __u8 *chunk_end; 582 583 struct sctp_chunkhdr *chunk_hdr; 584 struct sctphdr *sctp_hdr; 585 586 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 587 struct sctp_sndrcvinfo sinfo; 588 589 /* Which association does this belong to? */ 590 struct sctp_association *asoc; 591 592 /* What endpoint received this chunk? */ 593 struct sctp_ep_common *rcvr; 594 595 /* We fill this in if we are calculating RTT. */ 596 unsigned long sent_at; 597 598 /* What is the origin IP address for this chunk? */ 599 union sctp_addr source; 600 /* Destination address for this chunk. */ 601 union sctp_addr dest; 602 603 /* For outbound message, track all fragments for SEND_FAILED. */ 604 struct sctp_datamsg *msg; 605 606 /* For an inbound chunk, this tells us where it came from. 607 * For an outbound chunk, it tells us where we'd like it to 608 * go. It is NULL if we have no preference. 609 */ 610 struct sctp_transport *transport; 611 612 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 613 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 614 * spec violates the principle premis that all chunks are processed 615 * in order. 616 */ 617 struct sk_buff *auth_chunk; 618 619 #define SCTP_CAN_FRTX 0x0 620 #define SCTP_NEED_FRTX 0x1 621 #define SCTP_DONT_FRTX 0x2 622 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 623 has_tsn:1, /* Does this chunk have a TSN yet? */ 624 has_ssn:1, /* Does this chunk have a SSN yet? */ 625 singleton:1, /* Only chunk in the packet? */ 626 end_of_packet:1, /* Last chunk in the packet? */ 627 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 628 pdiscard:1, /* Discard the whole packet now? */ 629 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 630 data_accepted:1, /* At least 1 chunk accepted */ 631 auth:1, /* IN: was auth'ed | OUT: needs auth */ 632 has_asconf:1, /* IN: have seen an asconf before */ 633 tsn_missing_report:2, /* Data chunk missing counter. */ 634 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 635 }; 636 637 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 638 void sctp_chunk_hold(struct sctp_chunk *); 639 void sctp_chunk_put(struct sctp_chunk *); 640 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 641 struct iov_iter *from); 642 void sctp_chunk_free(struct sctp_chunk *); 643 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 644 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 645 const struct sctp_association *, 646 struct sock *, gfp_t gfp); 647 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 648 union sctp_addr *); 649 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 650 651 static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) 652 { 653 return ntohs(ch->subh.data_hdr->stream); 654 } 655 656 enum { 657 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 658 SCTP_ADDR_SRC, /* address can be used as source */ 659 SCTP_ADDR_DEL, /* address about to be deleted */ 660 }; 661 662 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 663 struct sctp_sockaddr_entry { 664 struct list_head list; 665 struct rcu_head rcu; 666 union sctp_addr a; 667 __u8 state; 668 __u8 valid; 669 }; 670 671 #define SCTP_ADDRESS_TICK_DELAY 500 672 673 /* This structure holds lists of chunks as we are assembling for 674 * transmission. 675 */ 676 struct sctp_packet { 677 /* These are the SCTP header values (host order) for the packet. */ 678 __u16 source_port; 679 __u16 destination_port; 680 __u32 vtag; 681 682 /* This contains the payload chunks. */ 683 struct list_head chunk_list; 684 685 /* This is the overhead of the sctp and ip headers. */ 686 size_t overhead; 687 /* This is the total size of all chunks INCLUDING padding. */ 688 size_t size; 689 /* This is the maximum size this packet may have */ 690 size_t max_size; 691 692 /* The packet is destined for this transport address. 693 * The function we finally use to pass down to the next lower 694 * layer lives in the transport structure. 695 */ 696 struct sctp_transport *transport; 697 698 /* pointer to the auth chunk for this packet */ 699 struct sctp_chunk *auth; 700 701 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 702 has_sack:1, /* This packet contains a SACK chunk. */ 703 has_auth:1, /* This packet contains an AUTH chunk */ 704 has_data:1, /* This packet contains at least 1 DATA chunk */ 705 ipfragok:1; /* So let ip fragment this packet */ 706 }; 707 708 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 709 __u16 sport, __u16 dport); 710 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 711 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, 712 struct sctp_chunk *chunk, 713 int one_packet, gfp_t gfp); 714 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, 715 struct sctp_chunk *chunk); 716 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 717 void sctp_packet_free(struct sctp_packet *); 718 719 static inline int sctp_packet_empty(struct sctp_packet *packet) 720 { 721 return packet->size == packet->overhead; 722 } 723 724 /* This represents a remote transport address. 725 * For local transport addresses, we just use union sctp_addr. 726 * 727 * RFC2960 Section 1.4 Key Terms 728 * 729 * o Transport address: A Transport Address is traditionally defined 730 * by Network Layer address, Transport Layer protocol and Transport 731 * Layer port number. In the case of SCTP running over IP, a 732 * transport address is defined by the combination of an IP address 733 * and an SCTP port number (where SCTP is the Transport protocol). 734 * 735 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 736 * 737 * o The sender keeps a separate congestion control parameter set for 738 * each of the destination addresses it can send to (not each 739 * source-destination pair but for each destination). The parameters 740 * should decay if the address is not used for a long enough time 741 * period. 742 * 743 */ 744 struct sctp_transport { 745 /* A list of transports. */ 746 struct list_head transports; 747 struct rhlist_head node; 748 749 /* Reference counting. */ 750 refcount_t refcnt; 751 /* RTO-Pending : A flag used to track if one of the DATA 752 * chunks sent to this address is currently being 753 * used to compute a RTT. If this flag is 0, 754 * the next DATA chunk sent to this destination 755 * should be used to compute a RTT and this flag 756 * should be set. Every time the RTT 757 * calculation completes (i.e. the DATA chunk 758 * is SACK'd) clear this flag. 759 */ 760 __u32 rto_pending:1, 761 762 /* 763 * hb_sent : a flag that signals that we have a pending 764 * heartbeat. 765 */ 766 hb_sent:1, 767 768 /* Is the Path MTU update pending on this tranport */ 769 pmtu_pending:1, 770 771 dst_pending_confirm:1, /* need to confirm neighbour */ 772 773 /* Has this transport moved the ctsn since we last sacked */ 774 sack_generation:1; 775 u32 dst_cookie; 776 777 struct flowi fl; 778 779 /* This is the peer's IP address and port. */ 780 union sctp_addr ipaddr; 781 782 /* These are the functions we call to handle LLP stuff. */ 783 struct sctp_af *af_specific; 784 785 /* Which association do we belong to? */ 786 struct sctp_association *asoc; 787 788 /* RFC2960 789 * 790 * 12.3 Per Transport Address Data 791 * 792 * For each destination transport address in the peer's 793 * address list derived from the INIT or INIT ACK chunk, a 794 * number of data elements needs to be maintained including: 795 */ 796 /* RTO : The current retransmission timeout value. */ 797 unsigned long rto; 798 799 __u32 rtt; /* This is the most recent RTT. */ 800 801 /* RTTVAR : The current RTT variation. */ 802 __u32 rttvar; 803 804 /* SRTT : The current smoothed round trip time. */ 805 __u32 srtt; 806 807 /* 808 * These are the congestion stats. 809 */ 810 /* cwnd : The current congestion window. */ 811 __u32 cwnd; /* This is the actual cwnd. */ 812 813 /* ssthresh : The current slow start threshold value. */ 814 __u32 ssthresh; 815 816 /* partial : The tracking method for increase of cwnd when in 817 * bytes acked : congestion avoidance mode (see Section 6.2.2) 818 */ 819 __u32 partial_bytes_acked; 820 821 /* Data that has been sent, but not acknowledged. */ 822 __u32 flight_size; 823 824 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 825 826 /* Destination */ 827 struct dst_entry *dst; 828 /* Source address. */ 829 union sctp_addr saddr; 830 831 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 832 * the destination address every heartbeat interval. 833 */ 834 unsigned long hbinterval; 835 836 /* SACK delay timeout */ 837 unsigned long sackdelay; 838 __u32 sackfreq; 839 840 /* When was the last time that we heard from this transport? We use 841 * this to pick new active and retran paths. 842 */ 843 ktime_t last_time_heard; 844 845 /* When was the last time that we sent a chunk using this 846 * transport? We use this to check for idle transports 847 */ 848 unsigned long last_time_sent; 849 850 /* Last time(in jiffies) when cwnd is reduced due to the congestion 851 * indication based on ECNE chunk. 852 */ 853 unsigned long last_time_ecne_reduced; 854 855 /* This is the max_retrans value for the transport and will 856 * be initialized from the assocs value. This can be changed 857 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 858 */ 859 __u16 pathmaxrxt; 860 861 /* This is the partially failed retrans value for the transport 862 * and will be initialized from the assocs value. This can be changed 863 * using the SCTP_PEER_ADDR_THLDS socket option 864 */ 865 int pf_retrans; 866 /* PMTU : The current known path MTU. */ 867 __u32 pathmtu; 868 869 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 870 __u32 param_flags; 871 872 /* The number of times INIT has been sent on this transport. */ 873 int init_sent_count; 874 875 /* state : The current state of this destination, 876 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 877 */ 878 int state; 879 880 /* These are the error stats for this destination. */ 881 882 /* Error count : The current error count for this destination. */ 883 unsigned short error_count; 884 885 /* Per : A timer used by each destination. 886 * Destination : 887 * Timer : 888 * 889 * [Everywhere else in the text this is called T3-rtx. -ed] 890 */ 891 struct timer_list T3_rtx_timer; 892 893 /* Heartbeat timer is per destination. */ 894 struct timer_list hb_timer; 895 896 /* Timer to handle ICMP proto unreachable envets */ 897 struct timer_list proto_unreach_timer; 898 899 /* Timer to handler reconf chunk rtx */ 900 struct timer_list reconf_timer; 901 902 /* Since we're using per-destination retransmission timers 903 * (see above), we're also using per-destination "transmitted" 904 * queues. This probably ought to be a private struct 905 * accessible only within the outqueue, but it's not, yet. 906 */ 907 struct list_head transmitted; 908 909 /* We build bundle-able packets for this transport here. */ 910 struct sctp_packet packet; 911 912 /* This is the list of transports that have chunks to send. */ 913 struct list_head send_ready; 914 915 /* State information saved for SFR_CACC algorithm. The key 916 * idea in SFR_CACC is to maintain state at the sender on a 917 * per-destination basis when a changeover happens. 918 * char changeover_active; 919 * char cycling_changeover; 920 * __u32 next_tsn_at_change; 921 * char cacc_saw_newack; 922 */ 923 struct { 924 /* An unsigned integer, which stores the next TSN to be 925 * used by the sender, at the moment of changeover. 926 */ 927 __u32 next_tsn_at_change; 928 929 /* A flag which indicates the occurrence of a changeover */ 930 char changeover_active; 931 932 /* A flag which indicates whether the change of primary is 933 * the first switch to this destination address during an 934 * active switch. 935 */ 936 char cycling_changeover; 937 938 /* A temporary flag, which is used during the processing of 939 * a SACK to estimate the causative TSN(s)'s group. 940 */ 941 char cacc_saw_newack; 942 } cacc; 943 944 /* 64-bit random number sent with heartbeat. */ 945 __u64 hb_nonce; 946 947 struct rcu_head rcu; 948 }; 949 950 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 951 gfp_t); 952 void sctp_transport_set_owner(struct sctp_transport *, 953 struct sctp_association *); 954 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 955 struct sctp_sock *); 956 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 957 void sctp_transport_free(struct sctp_transport *); 958 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 959 void sctp_transport_reset_hb_timer(struct sctp_transport *); 960 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 961 int sctp_transport_hold(struct sctp_transport *); 962 void sctp_transport_put(struct sctp_transport *); 963 void sctp_transport_update_rto(struct sctp_transport *, __u32); 964 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 965 void sctp_transport_lower_cwnd(struct sctp_transport *t, 966 enum sctp_lower_cwnd reason); 967 void sctp_transport_burst_limited(struct sctp_transport *); 968 void sctp_transport_burst_reset(struct sctp_transport *); 969 unsigned long sctp_transport_timeout(struct sctp_transport *); 970 void sctp_transport_reset(struct sctp_transport *t); 971 void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); 972 void sctp_transport_immediate_rtx(struct sctp_transport *); 973 void sctp_transport_dst_release(struct sctp_transport *t); 974 void sctp_transport_dst_confirm(struct sctp_transport *t); 975 976 977 /* This is the structure we use to queue packets as they come into 978 * SCTP. We write packets to it and read chunks from it. 979 */ 980 struct sctp_inq { 981 /* This is actually a queue of sctp_chunk each 982 * containing a partially decoded packet. 983 */ 984 struct list_head in_chunk_list; 985 /* This is the packet which is currently off the in queue and is 986 * being worked on through the inbound chunk processing. 987 */ 988 struct sctp_chunk *in_progress; 989 990 /* This is the delayed task to finish delivering inbound 991 * messages. 992 */ 993 struct work_struct immediate; 994 }; 995 996 void sctp_inq_init(struct sctp_inq *); 997 void sctp_inq_free(struct sctp_inq *); 998 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 999 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1000 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1001 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1002 1003 /* This is the structure we use to hold outbound chunks. You push 1004 * chunks in and they automatically pop out the other end as bundled 1005 * packets (it calls (*output_handler)()). 1006 * 1007 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1008 * and 8.2 of the v13 draft. 1009 * 1010 * It handles retransmissions. The connection to the timeout portion 1011 * of the state machine is through sctp_..._timeout() and timeout_handler. 1012 * 1013 * If you feed it SACKs, it will eat them. 1014 * 1015 * If you give it big chunks, it will fragment them. 1016 * 1017 * It assigns TSN's to data chunks. This happens at the last possible 1018 * instant before transmission. 1019 * 1020 * When free()'d, it empties itself out via output_handler(). 1021 */ 1022 struct sctp_outq { 1023 struct sctp_association *asoc; 1024 1025 /* Data pending that has never been transmitted. */ 1026 struct list_head out_chunk_list; 1027 1028 /* Stream scheduler being used */ 1029 struct sctp_sched_ops *sched; 1030 1031 unsigned int out_qlen; /* Total length of queued data chunks. */ 1032 1033 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1034 unsigned int error; 1035 1036 /* These are control chunks we want to send. */ 1037 struct list_head control_chunk_list; 1038 1039 /* These are chunks that have been sacked but are above the 1040 * CTSN, or cumulative tsn ack point. 1041 */ 1042 struct list_head sacked; 1043 1044 /* Put chunks on this list to schedule them for 1045 * retransmission. 1046 */ 1047 struct list_head retransmit; 1048 1049 /* Put chunks on this list to save them for FWD TSN processing as 1050 * they were abandoned. 1051 */ 1052 struct list_head abandoned; 1053 1054 /* How many unackd bytes do we have in-flight? */ 1055 __u32 outstanding_bytes; 1056 1057 /* Are we doing fast-rtx on this queue */ 1058 char fast_rtx; 1059 1060 /* Corked? */ 1061 char cork; 1062 }; 1063 1064 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1065 void sctp_outq_teardown(struct sctp_outq *); 1066 void sctp_outq_free(struct sctp_outq*); 1067 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1068 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1069 int sctp_outq_is_empty(const struct sctp_outq *); 1070 void sctp_outq_restart(struct sctp_outq *); 1071 1072 void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, 1073 enum sctp_retransmit_reason reason); 1074 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1075 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1076 void sctp_prsctp_prune(struct sctp_association *asoc, 1077 struct sctp_sndrcvinfo *sinfo, int msg_len); 1078 /* Uncork and flush an outqueue. */ 1079 static inline void sctp_outq_cork(struct sctp_outq *q) 1080 { 1081 q->cork = 1; 1082 } 1083 1084 /* SCTP skb control block. 1085 * sctp_input_cb is currently used on rx and sock rx queue 1086 */ 1087 struct sctp_input_cb { 1088 union { 1089 struct inet_skb_parm h4; 1090 #if IS_ENABLED(CONFIG_IPV6) 1091 struct inet6_skb_parm h6; 1092 #endif 1093 } header; 1094 struct sctp_chunk *chunk; 1095 struct sctp_af *af; 1096 }; 1097 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1098 1099 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1100 { 1101 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1102 1103 return chunk->head_skb ? : skb; 1104 } 1105 1106 /* These bind address data fields common between endpoints and associations */ 1107 struct sctp_bind_addr { 1108 1109 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1110 * 1111 * SCTP Port: The local SCTP port number the endpoint is 1112 * bound to. 1113 */ 1114 __u16 port; 1115 1116 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1117 * 1118 * Address List: The list of IP addresses that this instance 1119 * has bound. This information is passed to one's 1120 * peer(s) in INIT and INIT ACK chunks. 1121 */ 1122 struct list_head address_list; 1123 }; 1124 1125 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1126 void sctp_bind_addr_free(struct sctp_bind_addr *); 1127 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1128 const struct sctp_bind_addr *src, 1129 enum sctp_scope scope, gfp_t gfp, 1130 int flags); 1131 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1132 const struct sctp_bind_addr *src, 1133 gfp_t gfp); 1134 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1135 int new_size, __u8 addr_state, gfp_t gfp); 1136 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1137 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1138 struct sctp_sock *); 1139 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1140 struct sctp_sock *, struct sctp_sock *); 1141 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1142 const union sctp_addr *addr); 1143 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1144 const union sctp_addr *addrs, 1145 int addrcnt, 1146 struct sctp_sock *opt); 1147 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1148 int *addrs_len, 1149 gfp_t gfp); 1150 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1151 __u16 port, gfp_t gfp); 1152 1153 enum sctp_scope sctp_scope(const union sctp_addr *addr); 1154 int sctp_in_scope(struct net *net, const union sctp_addr *addr, 1155 const enum sctp_scope scope); 1156 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1157 int sctp_is_ep_boundall(struct sock *sk); 1158 1159 1160 /* What type of endpoint? */ 1161 enum sctp_endpoint_type { 1162 SCTP_EP_TYPE_SOCKET, 1163 SCTP_EP_TYPE_ASSOCIATION, 1164 }; 1165 1166 /* 1167 * A common base class to bridge the implmentation view of a 1168 * socket (usually listening) endpoint versus an association's 1169 * local endpoint. 1170 * This common structure is useful for several purposes: 1171 * 1) Common interface for lookup routines. 1172 * a) Subfunctions work for either endpoint or association 1173 * b) Single interface to lookup allows hiding the lookup lock rather 1174 * than acquiring it externally. 1175 * 2) Common interface for the inbound chunk handling/state machine. 1176 * 3) Common object handling routines for reference counting, etc. 1177 * 4) Disentangle association lookup from endpoint lookup, where we 1178 * do not have to find our endpoint to find our association. 1179 * 1180 */ 1181 1182 struct sctp_ep_common { 1183 /* Fields to help us manage our entries in the hash tables. */ 1184 struct hlist_node node; 1185 int hashent; 1186 1187 /* Runtime type information. What kind of endpoint is this? */ 1188 enum sctp_endpoint_type type; 1189 1190 /* Some fields to help us manage this object. 1191 * refcnt - Reference count access to this object. 1192 * dead - Do not attempt to use this object. 1193 */ 1194 refcount_t refcnt; 1195 bool dead; 1196 1197 /* What socket does this endpoint belong to? */ 1198 struct sock *sk; 1199 1200 /* This is where we receive inbound chunks. */ 1201 struct sctp_inq inqueue; 1202 1203 /* This substructure includes the defining parameters of the 1204 * endpoint: 1205 * bind_addr.port is our shared port number. 1206 * bind_addr.address_list is our set of local IP addresses. 1207 */ 1208 struct sctp_bind_addr bind_addr; 1209 }; 1210 1211 1212 /* RFC Section 1.4 Key Terms 1213 * 1214 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1215 * multi-homed host, an SCTP endpoint is represented to its peers as a 1216 * combination of a set of eligible destination transport addresses to 1217 * which SCTP packets can be sent and a set of eligible source 1218 * transport addresses from which SCTP packets can be received. 1219 * All transport addresses used by an SCTP endpoint must use the 1220 * same port number, but can use multiple IP addresses. A transport 1221 * address used by an SCTP endpoint must not be used by another 1222 * SCTP endpoint. In other words, a transport address is unique 1223 * to an SCTP endpoint. 1224 * 1225 * From an implementation perspective, each socket has one of these. 1226 * A TCP-style socket will have exactly one association on one of 1227 * these. An UDP-style socket will have multiple associations hanging 1228 * off one of these. 1229 */ 1230 1231 struct sctp_endpoint { 1232 /* Common substructure for endpoint and association. */ 1233 struct sctp_ep_common base; 1234 1235 /* Associations: A list of current associations and mappings 1236 * to the data consumers for each association. This 1237 * may be in the form of a hash table or other 1238 * implementation dependent structure. The data 1239 * consumers may be process identification 1240 * information such as file descriptors, named pipe 1241 * pointer, or table pointers dependent on how SCTP 1242 * is implemented. 1243 */ 1244 /* This is really a list of struct sctp_association entries. */ 1245 struct list_head asocs; 1246 1247 /* Secret Key: A secret key used by this endpoint to compute 1248 * the MAC. This SHOULD be a cryptographic quality 1249 * random number with a sufficient length. 1250 * Discussion in [RFC1750] can be helpful in 1251 * selection of the key. 1252 */ 1253 __u8 secret_key[SCTP_SECRET_SIZE]; 1254 1255 /* digest: This is a digest of the sctp cookie. This field is 1256 * only used on the receive path when we try to validate 1257 * that the cookie has not been tampered with. We put 1258 * this here so we pre-allocate this once and can re-use 1259 * on every receive. 1260 */ 1261 __u8 *digest; 1262 1263 /* sendbuf acct. policy. */ 1264 __u32 sndbuf_policy; 1265 1266 /* rcvbuf acct. policy. */ 1267 __u32 rcvbuf_policy; 1268 1269 /* SCTP AUTH: array of the HMACs that will be allocated 1270 * we need this per association so that we don't serialize 1271 */ 1272 struct crypto_shash **auth_hmacs; 1273 1274 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1275 struct sctp_hmac_algo_param *auth_hmacs_list; 1276 1277 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1278 struct sctp_chunks_param *auth_chunk_list; 1279 1280 /* SCTP-AUTH: endpoint shared keys */ 1281 struct list_head endpoint_shared_keys; 1282 __u16 active_key_id; 1283 __u8 auth_enable:1, 1284 prsctp_enable:1, 1285 reconf_enable:1; 1286 1287 __u8 strreset_enable; 1288 }; 1289 1290 /* Recover the outter endpoint structure. */ 1291 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1292 { 1293 struct sctp_endpoint *ep; 1294 1295 ep = container_of(base, struct sctp_endpoint, base); 1296 return ep; 1297 } 1298 1299 /* These are function signatures for manipulating endpoints. */ 1300 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1301 void sctp_endpoint_free(struct sctp_endpoint *); 1302 void sctp_endpoint_put(struct sctp_endpoint *); 1303 void sctp_endpoint_hold(struct sctp_endpoint *); 1304 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1305 struct sctp_association *sctp_endpoint_lookup_assoc( 1306 const struct sctp_endpoint *ep, 1307 const union sctp_addr *paddr, 1308 struct sctp_transport **); 1309 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1310 const union sctp_addr *); 1311 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1312 struct net *, const union sctp_addr *); 1313 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1314 const union sctp_addr *paddr); 1315 1316 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1317 const struct sctp_association *asoc, 1318 enum sctp_cid cid, struct sctp_init_chunk *peer_init, 1319 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1320 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1321 const union sctp_addr *peer, 1322 struct sctp_init_chunk *init, gfp_t gfp); 1323 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1324 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1325 1326 struct sctp_inithdr_host { 1327 __u32 init_tag; 1328 __u32 a_rwnd; 1329 __u16 num_outbound_streams; 1330 __u16 num_inbound_streams; 1331 __u32 initial_tsn; 1332 }; 1333 1334 struct sctp_stream_priorities { 1335 /* List of priorities scheduled */ 1336 struct list_head prio_sched; 1337 /* List of streams scheduled */ 1338 struct list_head active; 1339 /* The next stream stream in line */ 1340 struct sctp_stream_out_ext *next; 1341 __u16 prio; 1342 }; 1343 1344 struct sctp_stream_out_ext { 1345 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1346 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1347 struct list_head outq; /* chunks enqueued by this stream */ 1348 union { 1349 struct { 1350 /* Scheduled streams list */ 1351 struct list_head prio_list; 1352 struct sctp_stream_priorities *prio_head; 1353 }; 1354 /* Fields used by RR scheduler */ 1355 struct { 1356 struct list_head rr_list; 1357 }; 1358 }; 1359 }; 1360 1361 struct sctp_stream_out { 1362 __u16 ssn; 1363 __u8 state; 1364 struct sctp_stream_out_ext *ext; 1365 }; 1366 1367 struct sctp_stream_in { 1368 __u16 ssn; 1369 }; 1370 1371 struct sctp_stream { 1372 struct sctp_stream_out *out; 1373 struct sctp_stream_in *in; 1374 __u16 outcnt; 1375 __u16 incnt; 1376 /* Current stream being sent, if any */ 1377 struct sctp_stream_out *out_curr; 1378 union { 1379 /* Fields used by priority scheduler */ 1380 struct { 1381 /* List of priorities scheduled */ 1382 struct list_head prio_list; 1383 }; 1384 /* Fields used by RR scheduler */ 1385 struct { 1386 /* List of streams scheduled */ 1387 struct list_head rr_list; 1388 /* The next stream stream in line */ 1389 struct sctp_stream_out_ext *rr_next; 1390 }; 1391 }; 1392 }; 1393 1394 #define SCTP_STREAM_CLOSED 0x00 1395 #define SCTP_STREAM_OPEN 0x01 1396 1397 /* SCTP_GET_ASSOC_STATS counters */ 1398 struct sctp_priv_assoc_stats { 1399 /* Maximum observed rto in the association during subsequent 1400 * observations. Value is set to 0 if no RTO measurement took place 1401 * The transport where the max_rto was observed is returned in 1402 * obs_rto_ipaddr 1403 */ 1404 struct sockaddr_storage obs_rto_ipaddr; 1405 __u64 max_obs_rto; 1406 /* Total In and Out SACKs received and sent */ 1407 __u64 isacks; 1408 __u64 osacks; 1409 /* Total In and Out packets received and sent */ 1410 __u64 opackets; 1411 __u64 ipackets; 1412 /* Total retransmitted chunks */ 1413 __u64 rtxchunks; 1414 /* TSN received > next expected */ 1415 __u64 outofseqtsns; 1416 /* Duplicate Chunks received */ 1417 __u64 idupchunks; 1418 /* Gap Ack Blocks received */ 1419 __u64 gapcnt; 1420 /* Unordered data chunks sent and received */ 1421 __u64 ouodchunks; 1422 __u64 iuodchunks; 1423 /* Ordered data chunks sent and received */ 1424 __u64 oodchunks; 1425 __u64 iodchunks; 1426 /* Control chunks sent and received */ 1427 __u64 octrlchunks; 1428 __u64 ictrlchunks; 1429 }; 1430 1431 /* RFC2960 1432 * 1433 * 12. Recommended Transmission Control Block (TCB) Parameters 1434 * 1435 * This section details a recommended set of parameters that should 1436 * be contained within the TCB for an implementation. This section is 1437 * for illustrative purposes and should not be deemed as requirements 1438 * on an implementation or as an exhaustive list of all parameters 1439 * inside an SCTP TCB. Each implementation may need its own additional 1440 * parameters for optimization. 1441 */ 1442 1443 1444 /* Here we have information about each individual association. */ 1445 struct sctp_association { 1446 1447 /* A base structure common to endpoint and association. 1448 * In this context, it represents the associations's view 1449 * of the local endpoint of the association. 1450 */ 1451 struct sctp_ep_common base; 1452 1453 /* Associations on the same socket. */ 1454 struct list_head asocs; 1455 1456 /* association id. */ 1457 sctp_assoc_t assoc_id; 1458 1459 /* This is our parent endpoint. */ 1460 struct sctp_endpoint *ep; 1461 1462 /* These are those association elements needed in the cookie. */ 1463 struct sctp_cookie c; 1464 1465 /* This is all information about our peer. */ 1466 struct { 1467 /* transport_addr_list 1468 * 1469 * Peer : A list of SCTP transport addresses that the 1470 * Transport : peer is bound to. This information is derived 1471 * Address : from the INIT or INIT ACK and is used to 1472 * List : associate an inbound packet with a given 1473 * : association. Normally this information is 1474 * : hashed or keyed for quick lookup and access 1475 * : of the TCB. 1476 * : The list is also initialized with the list 1477 * : of addresses passed with the sctp_connectx() 1478 * : call. 1479 * 1480 * It is a list of SCTP_transport's. 1481 */ 1482 struct list_head transport_addr_list; 1483 1484 /* rwnd 1485 * 1486 * Peer Rwnd : Current calculated value of the peer's rwnd. 1487 */ 1488 __u32 rwnd; 1489 1490 /* transport_count 1491 * 1492 * Peer : A count of the number of peer addresses 1493 * Transport : in the Peer Transport Address List. 1494 * Address : 1495 * Count : 1496 */ 1497 __u16 transport_count; 1498 1499 /* port 1500 * The transport layer port number. 1501 */ 1502 __u16 port; 1503 1504 /* primary_path 1505 * 1506 * Primary : This is the current primary destination 1507 * Path : transport address of the peer endpoint. It 1508 * : may also specify a source transport address 1509 * : on this endpoint. 1510 * 1511 * All of these paths live on transport_addr_list. 1512 * 1513 * At the bakeoffs, we discovered that the intent of 1514 * primaryPath is that it only changes when the ULP 1515 * asks to have it changed. We add the activePath to 1516 * designate the connection we are currently using to 1517 * transmit new data and most control chunks. 1518 */ 1519 struct sctp_transport *primary_path; 1520 1521 /* Cache the primary path address here, when we 1522 * need a an address for msg_name. 1523 */ 1524 union sctp_addr primary_addr; 1525 1526 /* active_path 1527 * The path that we are currently using to 1528 * transmit new data and most control chunks. 1529 */ 1530 struct sctp_transport *active_path; 1531 1532 /* retran_path 1533 * 1534 * RFC2960 6.4 Multi-homed SCTP Endpoints 1535 * ... 1536 * Furthermore, when its peer is multi-homed, an 1537 * endpoint SHOULD try to retransmit a chunk to an 1538 * active destination transport address that is 1539 * different from the last destination address to 1540 * which the DATA chunk was sent. 1541 */ 1542 struct sctp_transport *retran_path; 1543 1544 /* Pointer to last transport I have sent on. */ 1545 struct sctp_transport *last_sent_to; 1546 1547 /* This is the last transport I have received DATA on. */ 1548 struct sctp_transport *last_data_from; 1549 1550 /* 1551 * Mapping An array of bits or bytes indicating which out of 1552 * Array order TSN's have been received (relative to the 1553 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1554 * order packets have been received, this array 1555 * will be set to all zero. This structure may be 1556 * in the form of a circular buffer or bit array. 1557 * 1558 * Last Rcvd : This is the last TSN received in 1559 * TSN : sequence. This value is set initially by 1560 * : taking the peer's Initial TSN, received in 1561 * : the INIT or INIT ACK chunk, and subtracting 1562 * : one from it. 1563 * 1564 * Throughout most of the specification this is called the 1565 * "Cumulative TSN ACK Point". In this case, we 1566 * ignore the advice in 12.2 in favour of the term 1567 * used in the bulk of the text. This value is hidden 1568 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1569 */ 1570 struct sctp_tsnmap tsn_map; 1571 1572 /* This mask is used to disable sending the ASCONF chunk 1573 * with specified parameter to peer. 1574 */ 1575 __be16 addip_disabled_mask; 1576 1577 /* These are capabilities which our peer advertised. */ 1578 __u8 ecn_capable:1, /* Can peer do ECN? */ 1579 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1580 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1581 hostname_address:1, /* Peer understands DNS addresses? */ 1582 asconf_capable:1, /* Does peer support ADDIP? */ 1583 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1584 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1585 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1586 1587 /* sack_needed : This flag indicates if the next received 1588 * : packet is to be responded to with a 1589 * : SACK. This is initialized to 0. When a packet 1590 * : is received sack_cnt is incremented. If this value 1591 * : reaches 2 or more, a SACK is sent and the 1592 * : value is reset to 0. Note: This is used only 1593 * : when no DATA chunks are received out of 1594 * : order. When DATA chunks are out of order, 1595 * : SACK's are not delayed (see Section 6). 1596 */ 1597 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1598 sack_generation:1, 1599 zero_window_announced:1; 1600 __u32 sack_cnt; 1601 1602 __u32 adaptation_ind; /* Adaptation Code point. */ 1603 1604 struct sctp_inithdr_host i; 1605 void *cookie; 1606 int cookie_len; 1607 1608 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1609 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1610 * Initial TSN Value minus 1 1611 */ 1612 __u32 addip_serial; 1613 1614 /* SCTP-AUTH: We need to know pears random number, hmac list 1615 * and authenticated chunk list. All that is part of the 1616 * cookie and these are just pointers to those locations 1617 */ 1618 struct sctp_random_param *peer_random; 1619 struct sctp_chunks_param *peer_chunks; 1620 struct sctp_hmac_algo_param *peer_hmacs; 1621 } peer; 1622 1623 /* State : A state variable indicating what state the 1624 * : association is in, i.e. COOKIE-WAIT, 1625 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1626 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1627 * 1628 * Note: No "CLOSED" state is illustrated since if a 1629 * association is "CLOSED" its TCB SHOULD be removed. 1630 * 1631 * In this implementation we DO have a CLOSED 1632 * state which is used during initiation and shutdown. 1633 * 1634 * State takes values from SCTP_STATE_*. 1635 */ 1636 enum sctp_state state; 1637 1638 /* Overall : The overall association error count. 1639 * Error Count : [Clear this any time I get something.] 1640 */ 1641 int overall_error_count; 1642 1643 /* The cookie life I award for any cookie. */ 1644 ktime_t cookie_life; 1645 1646 /* These are the association's initial, max, and min RTO values. 1647 * These values will be initialized by system defaults, but can 1648 * be modified via the SCTP_RTOINFO socket option. 1649 */ 1650 unsigned long rto_initial; 1651 unsigned long rto_max; 1652 unsigned long rto_min; 1653 1654 /* Maximum number of new data packets that can be sent in a burst. */ 1655 int max_burst; 1656 1657 /* This is the max_retrans value for the association. This value will 1658 * be initialized initialized from system defaults, but can be 1659 * modified by the SCTP_ASSOCINFO socket option. 1660 */ 1661 int max_retrans; 1662 1663 /* This is the partially failed retrans value for the transport 1664 * and will be initialized from the assocs value. This can be 1665 * changed using the SCTP_PEER_ADDR_THLDS socket option 1666 */ 1667 int pf_retrans; 1668 1669 /* Maximum number of times the endpoint will retransmit INIT */ 1670 __u16 max_init_attempts; 1671 1672 /* How many times have we resent an INIT? */ 1673 __u16 init_retries; 1674 1675 /* The largest timeout or RTO value to use in attempting an INIT */ 1676 unsigned long max_init_timeo; 1677 1678 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1679 * the destination address every heartbeat interval. This value 1680 * will be inherited by all new transports. 1681 */ 1682 unsigned long hbinterval; 1683 1684 /* This is the max_retrans value for new transports in the 1685 * association. 1686 */ 1687 __u16 pathmaxrxt; 1688 1689 /* Flag that path mtu update is pending */ 1690 __u8 pmtu_pending; 1691 1692 /* Association : The smallest PMTU discovered for all of the 1693 * PMTU : peer's transport addresses. 1694 */ 1695 __u32 pathmtu; 1696 1697 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1698 __u32 param_flags; 1699 1700 __u32 sackfreq; 1701 /* SACK delay timeout */ 1702 unsigned long sackdelay; 1703 1704 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1705 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1706 1707 /* Transport to which SHUTDOWN chunk was last sent. */ 1708 struct sctp_transport *shutdown_last_sent_to; 1709 1710 /* Transport to which INIT chunk was last sent. */ 1711 struct sctp_transport *init_last_sent_to; 1712 1713 /* How many times have we resent a SHUTDOWN */ 1714 int shutdown_retries; 1715 1716 /* Next TSN : The next TSN number to be assigned to a new 1717 * : DATA chunk. This is sent in the INIT or INIT 1718 * : ACK chunk to the peer and incremented each 1719 * : time a DATA chunk is assigned a TSN 1720 * : (normally just prior to transmit or during 1721 * : fragmentation). 1722 */ 1723 __u32 next_tsn; 1724 1725 /* 1726 * Last Rcvd : This is the last TSN received in sequence. This value 1727 * TSN : is set initially by taking the peer's Initial TSN, 1728 * : received in the INIT or INIT ACK chunk, and 1729 * : subtracting one from it. 1730 * 1731 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1732 */ 1733 1734 __u32 ctsn_ack_point; 1735 1736 /* PR-SCTP Advanced.Peer.Ack.Point */ 1737 __u32 adv_peer_ack_point; 1738 1739 /* Highest TSN that is acknowledged by incoming SACKs. */ 1740 __u32 highest_sacked; 1741 1742 /* TSN marking the fast recovery exit point */ 1743 __u32 fast_recovery_exit; 1744 1745 /* Flag to track the current fast recovery state */ 1746 __u8 fast_recovery; 1747 1748 /* The number of unacknowledged data chunks. Reported through 1749 * the SCTP_STATUS sockopt. 1750 */ 1751 __u16 unack_data; 1752 1753 /* The total number of data chunks that we've had to retransmit 1754 * as the result of a T3 timer expiration 1755 */ 1756 __u32 rtx_data_chunks; 1757 1758 /* This is the association's receive buffer space. This value is used 1759 * to set a_rwnd field in an INIT or a SACK chunk. 1760 */ 1761 __u32 rwnd; 1762 1763 /* This is the last advertised value of rwnd over a SACK chunk. */ 1764 __u32 a_rwnd; 1765 1766 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1767 * to slop over a maximum of the association's frag_point. 1768 */ 1769 __u32 rwnd_over; 1770 1771 /* Keeps treack of rwnd pressure. This happens when we have 1772 * a window, but not recevie buffer (i.e small packets). This one 1773 * is releases slowly (1 PMTU at a time ). 1774 */ 1775 __u32 rwnd_press; 1776 1777 /* This is the sndbuf size in use for the association. 1778 * This corresponds to the sndbuf size for the association, 1779 * as specified in the sk->sndbuf. 1780 */ 1781 int sndbuf_used; 1782 1783 /* This is the amount of memory that this association has allocated 1784 * in the receive path at any given time. 1785 */ 1786 atomic_t rmem_alloc; 1787 1788 /* This is the wait queue head for send requests waiting on 1789 * the association sndbuf space. 1790 */ 1791 wait_queue_head_t wait; 1792 1793 /* The message size at which SCTP fragmentation will occur. */ 1794 __u32 frag_point; 1795 __u32 user_frag; 1796 1797 /* Counter used to count INIT errors. */ 1798 int init_err_counter; 1799 1800 /* Count the number of INIT cycles (for doubling timeout). */ 1801 int init_cycle; 1802 1803 /* Default send parameters. */ 1804 __u16 default_stream; 1805 __u16 default_flags; 1806 __u32 default_ppid; 1807 __u32 default_context; 1808 __u32 default_timetolive; 1809 1810 /* Default receive parameters */ 1811 __u32 default_rcv_context; 1812 1813 /* Stream arrays */ 1814 struct sctp_stream stream; 1815 1816 /* All outbound chunks go through this structure. */ 1817 struct sctp_outq outqueue; 1818 1819 /* A smart pipe that will handle reordering and fragmentation, 1820 * as well as handle passing events up to the ULP. 1821 */ 1822 struct sctp_ulpq ulpq; 1823 1824 /* Last TSN that caused an ECNE Chunk to be sent. */ 1825 __u32 last_ecne_tsn; 1826 1827 /* Last TSN that caused a CWR Chunk to be sent. */ 1828 __u32 last_cwr_tsn; 1829 1830 /* How many duplicated TSNs have we seen? */ 1831 int numduptsns; 1832 1833 /* These are to support 1834 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1835 * and Enforcement of Flow and Message Limits" 1836 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1837 * or "ADDIP" for short. 1838 */ 1839 1840 1841 1842 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1843 * 1844 * R1) One and only one ASCONF Chunk MAY be in transit and 1845 * unacknowledged at any one time. If a sender, after sending 1846 * an ASCONF chunk, decides it needs to transfer another 1847 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1848 * returns from the previous ASCONF Chunk before sending a 1849 * subsequent ASCONF. Note this restriction binds each side, 1850 * so at any time two ASCONF may be in-transit on any given 1851 * association (one sent from each endpoint). 1852 * 1853 * [This is our one-and-only-one ASCONF in flight. If we do 1854 * not have an ASCONF in flight, this is NULL.] 1855 */ 1856 struct sctp_chunk *addip_last_asconf; 1857 1858 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1859 * 1860 * This is needed to implement itmes E1 - E4 of the updated 1861 * spec. Here is the justification: 1862 * 1863 * Since the peer may bundle multiple ASCONF chunks toward us, 1864 * we now need the ability to cache multiple ACKs. The section 1865 * describes in detail how they are cached and cleaned up. 1866 */ 1867 struct list_head asconf_ack_list; 1868 1869 /* These ASCONF chunks are waiting to be sent. 1870 * 1871 * These chunaks can't be pushed to outqueue until receiving 1872 * ASCONF_ACK for the previous ASCONF indicated by 1873 * addip_last_asconf, so as to guarantee that only one ASCONF 1874 * is in flight at any time. 1875 * 1876 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1877 * 1878 * In defining the ASCONF Chunk transfer procedures, it is 1879 * essential that these transfers MUST NOT cause congestion 1880 * within the network. To achieve this, we place these 1881 * restrictions on the transfer of ASCONF Chunks: 1882 * 1883 * R1) One and only one ASCONF Chunk MAY be in transit and 1884 * unacknowledged at any one time. If a sender, after sending 1885 * an ASCONF chunk, decides it needs to transfer another 1886 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1887 * returns from the previous ASCONF Chunk before sending a 1888 * subsequent ASCONF. Note this restriction binds each side, 1889 * so at any time two ASCONF may be in-transit on any given 1890 * association (one sent from each endpoint). 1891 * 1892 * 1893 * [I really think this is EXACTLY the sort of intelligence 1894 * which already resides in sctp_outq. Please move this 1895 * queue and its supporting logic down there. --piggy] 1896 */ 1897 struct list_head addip_chunk_list; 1898 1899 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1900 * 1901 * A2) A serial number should be assigned to the Chunk. The 1902 * serial number SHOULD be a monotonically increasing 1903 * number. The serial number SHOULD be initialized at 1904 * the start of the association to the same value as the 1905 * Initial TSN and every time a new ASCONF chunk is created 1906 * it is incremented by one after assigning the serial number 1907 * to the newly created chunk. 1908 * 1909 * ADDIP 1910 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1911 * 1912 * Serial Number : 32 bits (unsigned integer) 1913 * 1914 * This value represents a Serial Number for the ASCONF 1915 * Chunk. The valid range of Serial Number is from 0 to 1916 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1917 * after reaching 4294967295. 1918 */ 1919 __u32 addip_serial; 1920 int src_out_of_asoc_ok; 1921 union sctp_addr *asconf_addr_del_pending; 1922 struct sctp_transport *new_transport; 1923 1924 /* SCTP AUTH: list of the endpoint shared keys. These 1925 * keys are provided out of band by the user applicaton 1926 * and can't change during the lifetime of the association 1927 */ 1928 struct list_head endpoint_shared_keys; 1929 1930 /* SCTP AUTH: 1931 * The current generated assocaition shared key (secret) 1932 */ 1933 struct sctp_auth_bytes *asoc_shared_key; 1934 1935 /* SCTP AUTH: hmac id of the first peer requested algorithm 1936 * that we support. 1937 */ 1938 __u16 default_hmac_id; 1939 1940 __u16 active_key_id; 1941 1942 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1943 temp:1, /* Is it a temporary association? */ 1944 force_delay:1, 1945 intl_enable:1, 1946 prsctp_enable:1, 1947 reconf_enable:1; 1948 1949 __u8 strreset_enable; 1950 __u8 strreset_outstanding; /* request param count on the fly */ 1951 1952 __u32 strreset_outseq; /* Update after receiving response */ 1953 __u32 strreset_inseq; /* Update after receiving request */ 1954 __u32 strreset_result[2]; /* save the results of last 2 responses */ 1955 1956 struct sctp_chunk *strreset_chunk; /* save request chunk */ 1957 1958 struct sctp_priv_assoc_stats stats; 1959 1960 int sent_cnt_removable; 1961 1962 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1963 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1964 }; 1965 1966 1967 /* An eyecatcher for determining if we are really looking at an 1968 * association data structure. 1969 */ 1970 enum { 1971 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1972 }; 1973 1974 /* Recover the outter association structure. */ 1975 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1976 { 1977 struct sctp_association *asoc; 1978 1979 asoc = container_of(base, struct sctp_association, base); 1980 return asoc; 1981 } 1982 1983 /* These are function signatures for manipulating associations. */ 1984 1985 1986 struct sctp_association * 1987 sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, 1988 enum sctp_scope scope, gfp_t gfp); 1989 void sctp_association_free(struct sctp_association *); 1990 void sctp_association_put(struct sctp_association *); 1991 void sctp_association_hold(struct sctp_association *); 1992 1993 struct sctp_transport *sctp_assoc_choose_alter_transport( 1994 struct sctp_association *, struct sctp_transport *); 1995 void sctp_assoc_update_retran_path(struct sctp_association *); 1996 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1997 const union sctp_addr *); 1998 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1999 const union sctp_addr *laddr); 2000 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 2001 const union sctp_addr *address, 2002 const gfp_t gfp, 2003 const int peer_state); 2004 void sctp_assoc_del_peer(struct sctp_association *asoc, 2005 const union sctp_addr *addr); 2006 void sctp_assoc_rm_peer(struct sctp_association *asoc, 2007 struct sctp_transport *peer); 2008 void sctp_assoc_control_transport(struct sctp_association *asoc, 2009 struct sctp_transport *transport, 2010 enum sctp_transport_cmd command, 2011 sctp_sn_error_t error); 2012 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 2013 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 2014 struct net *, 2015 const union sctp_addr *, 2016 const union sctp_addr *); 2017 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 2018 int sctp_assoc_update(struct sctp_association *old, 2019 struct sctp_association *new); 2020 2021 __u32 sctp_association_get_next_tsn(struct sctp_association *); 2022 2023 void sctp_assoc_sync_pmtu(struct sctp_association *asoc); 2024 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 2025 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 2026 void sctp_assoc_set_primary(struct sctp_association *, 2027 struct sctp_transport *); 2028 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 2029 struct sctp_transport *); 2030 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, 2031 enum sctp_scope scope, gfp_t gfp); 2032 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 2033 struct sctp_cookie*, 2034 gfp_t gfp); 2035 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 2036 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 2037 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 2038 const struct sctp_association *asoc, 2039 __be32 serial); 2040 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 2041 2042 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 2043 const union sctp_addr *ss2); 2044 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2045 2046 /* A convenience structure to parse out SCTP specific CMSGs. */ 2047 struct sctp_cmsgs { 2048 struct sctp_initmsg *init; 2049 struct sctp_sndrcvinfo *srinfo; 2050 struct sctp_sndinfo *sinfo; 2051 }; 2052 2053 /* Structure for tracking memory objects */ 2054 struct sctp_dbg_objcnt_entry { 2055 char *label; 2056 atomic_t *counter; 2057 }; 2058 2059 #endif /* __sctp_structs_h__ */ 2060