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