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 #include <net/sctp/stream_interleave.h> 93 94 /* Structures useful for managing bind/connect. */ 95 96 struct sctp_bind_bucket { 97 unsigned short port; 98 unsigned short fastreuse; 99 struct hlist_node node; 100 struct hlist_head owner; 101 struct net *net; 102 }; 103 104 struct sctp_bind_hashbucket { 105 spinlock_t lock; 106 struct hlist_head chain; 107 }; 108 109 /* Used for hashing all associations. */ 110 struct sctp_hashbucket { 111 rwlock_t lock; 112 struct hlist_head chain; 113 } __attribute__((__aligned__(8))); 114 115 116 /* The SCTP globals structure. */ 117 extern struct sctp_globals { 118 /* This is a list of groups of functions for each address 119 * family that we support. 120 */ 121 struct list_head address_families; 122 123 /* This is the hash of all endpoints. */ 124 struct sctp_hashbucket *ep_hashtable; 125 /* This is the sctp port control hash. */ 126 struct sctp_bind_hashbucket *port_hashtable; 127 /* This is the hash of all transports. */ 128 struct rhltable transport_hashtable; 129 130 /* Sizes of above hashtables. */ 131 int ep_hashsize; 132 int port_hashsize; 133 134 /* Default initialization values to be applied to new associations. */ 135 __u16 max_instreams; 136 __u16 max_outstreams; 137 138 /* Flag to indicate whether computing and verifying checksum 139 * is disabled. */ 140 bool checksum_disable; 141 } sctp_globals; 142 143 #define sctp_max_instreams (sctp_globals.max_instreams) 144 #define sctp_max_outstreams (sctp_globals.max_outstreams) 145 #define sctp_address_families (sctp_globals.address_families) 146 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 147 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 148 #define sctp_port_hashsize (sctp_globals.port_hashsize) 149 #define sctp_port_hashtable (sctp_globals.port_hashtable) 150 #define sctp_transport_hashtable (sctp_globals.transport_hashtable) 151 #define sctp_checksum_disable (sctp_globals.checksum_disable) 152 153 /* SCTP Socket type: UDP or TCP style. */ 154 enum sctp_socket_type { 155 SCTP_SOCKET_UDP = 0, 156 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 157 SCTP_SOCKET_TCP 158 }; 159 160 /* Per socket SCTP information. */ 161 struct sctp_sock { 162 /* inet_sock has to be the first member of sctp_sock */ 163 struct inet_sock inet; 164 /* What kind of a socket is this? */ 165 enum sctp_socket_type type; 166 167 /* PF_ family specific functions. */ 168 struct sctp_pf *pf; 169 170 /* Access to HMAC transform. */ 171 struct crypto_shash *hmac; 172 char *sctp_hmac_alg; 173 174 /* What is our base endpointer? */ 175 struct sctp_endpoint *ep; 176 177 struct sctp_bind_bucket *bind_hash; 178 /* Various Socket Options. */ 179 __u16 default_stream; 180 __u32 default_ppid; 181 __u16 default_flags; 182 __u32 default_context; 183 __u32 default_timetolive; 184 __u32 default_rcv_context; 185 int max_burst; 186 187 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 188 * the destination address every heartbeat interval. This value 189 * will be inherited by all new associations. 190 */ 191 __u32 hbinterval; 192 193 /* This is the max_retrans value for new associations. */ 194 __u16 pathmaxrxt; 195 196 /* The initial Path MTU to use for new associations. */ 197 __u32 pathmtu; 198 199 /* The default SACK delay timeout for new associations. */ 200 __u32 sackdelay; 201 __u32 sackfreq; 202 203 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 204 __u32 param_flags; 205 206 struct sctp_initmsg initmsg; 207 struct sctp_rtoinfo rtoinfo; 208 struct sctp_paddrparams paddrparam; 209 struct sctp_event_subscribe subscribe; 210 struct sctp_assocparams assocparams; 211 212 int user_frag; 213 214 __u32 autoclose; 215 __u32 adaptation_ind; 216 __u32 pd_point; 217 __u16 nodelay:1, 218 disable_fragments:1, 219 v4mapped:1, 220 frag_interleave:1, 221 strm_interleave:1, 222 recvrcvinfo:1, 223 recvnxtinfo:1, 224 data_ready_signalled:1; 225 226 atomic_t pd_mode; 227 /* Receive to here while partial delivery is in effect. */ 228 struct sk_buff_head pd_lobby; 229 230 /* These must be the last fields, as they will skipped on copies, 231 * like on accept and peeloff operations 232 */ 233 struct list_head auto_asconf_list; 234 int do_auto_asconf; 235 }; 236 237 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 238 { 239 return (struct sctp_sock *)sk; 240 } 241 242 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 243 { 244 return (struct sock *)sp; 245 } 246 247 #if IS_ENABLED(CONFIG_IPV6) 248 struct sctp6_sock { 249 struct sctp_sock sctp; 250 struct ipv6_pinfo inet6; 251 }; 252 #endif /* CONFIG_IPV6 */ 253 254 255 /* This is our APPLICATION-SPECIFIC state cookie. 256 * THIS IS NOT DICTATED BY THE SPECIFICATION. 257 */ 258 /* These are the parts of an association which we send in the cookie. 259 * Most of these are straight out of: 260 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 261 * 262 */ 263 264 struct sctp_cookie { 265 266 /* My : Tag expected in every inbound packet and sent 267 * Verification: in the INIT or INIT ACK chunk. 268 * Tag : 269 */ 270 __u32 my_vtag; 271 272 /* Peer's : Tag expected in every outbound packet except 273 * Verification: in the INIT chunk. 274 * Tag : 275 */ 276 __u32 peer_vtag; 277 278 /* The rest of these are not from the spec, but really need to 279 * be in the cookie. 280 */ 281 282 /* My Tie Tag : Assist in discovering a restarting association. */ 283 __u32 my_ttag; 284 285 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 286 __u32 peer_ttag; 287 288 /* When does this cookie expire? */ 289 ktime_t expiration; 290 291 /* Number of inbound/outbound streams which are set 292 * and negotiated during the INIT process. 293 */ 294 __u16 sinit_num_ostreams; 295 __u16 sinit_max_instreams; 296 297 /* This is the first sequence number I used. */ 298 __u32 initial_tsn; 299 300 /* This holds the originating address of the INIT packet. */ 301 union sctp_addr peer_addr; 302 303 /* IG Section 2.35.3 304 * Include the source port of the INIT-ACK 305 */ 306 __u16 my_port; 307 308 __u8 prsctp_capable; 309 310 /* Padding for future use */ 311 __u8 padding; 312 313 __u32 adaptation_ind; 314 315 __u8 auth_random[sizeof(struct sctp_paramhdr) + 316 SCTP_AUTH_RANDOM_LENGTH]; 317 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 318 __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; 319 320 /* This is a shim for my peer's INIT packet, followed by 321 * a copy of the raw address list of the association. 322 * The length of the raw address list is saved in the 323 * raw_addr_list_len field, which will be used at the time when 324 * the association TCB is re-constructed from the cookie. 325 */ 326 __u32 raw_addr_list_len; 327 struct sctp_init_chunk peer_init[0]; 328 }; 329 330 331 /* The format of our cookie that we send to our peer. */ 332 struct sctp_signed_cookie { 333 __u8 signature[SCTP_SECRET_SIZE]; 334 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 335 struct sctp_cookie c; 336 } __packed; 337 338 /* This is another convenience type to allocate memory for address 339 * params for the maximum size and pass such structures around 340 * internally. 341 */ 342 union sctp_addr_param { 343 struct sctp_paramhdr p; 344 struct sctp_ipv4addr_param v4; 345 struct sctp_ipv6addr_param v6; 346 }; 347 348 /* A convenience type to allow walking through the various 349 * parameters and avoid casting all over the place. 350 */ 351 union sctp_params { 352 void *v; 353 struct sctp_paramhdr *p; 354 struct sctp_cookie_preserve_param *life; 355 struct sctp_hostname_param *dns; 356 struct sctp_cookie_param *cookie; 357 struct sctp_supported_addrs_param *sat; 358 struct sctp_ipv4addr_param *v4; 359 struct sctp_ipv6addr_param *v6; 360 union sctp_addr_param *addr; 361 struct sctp_adaptation_ind_param *aind; 362 struct sctp_supported_ext_param *ext; 363 struct sctp_random_param *random; 364 struct sctp_chunks_param *chunks; 365 struct sctp_hmac_algo_param *hmac_algo; 366 struct sctp_addip_param *addip; 367 }; 368 369 /* RFC 2960. Section 3.3.5 Heartbeat. 370 * Heartbeat Information: variable length 371 * The Sender-specific Heartbeat Info field should normally include 372 * information about the sender's current time when this HEARTBEAT 373 * chunk is sent and the destination transport address to which this 374 * HEARTBEAT is sent (see Section 8.3). 375 */ 376 struct sctp_sender_hb_info { 377 struct sctp_paramhdr param_hdr; 378 union sctp_addr daddr; 379 unsigned long sent_at; 380 __u64 hb_nonce; 381 }; 382 383 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 384 gfp_t gfp); 385 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid); 386 void sctp_stream_free(struct sctp_stream *stream); 387 void sctp_stream_clear(struct sctp_stream *stream); 388 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); 389 390 /* What is the current SSN number for this stream? */ 391 #define sctp_ssn_peek(stream, type, sid) \ 392 ((stream)->type[sid].ssn) 393 394 /* Return the next SSN number for this stream. */ 395 #define sctp_ssn_next(stream, type, sid) \ 396 ((stream)->type[sid].ssn++) 397 398 /* Skip over this ssn and all below. */ 399 #define sctp_ssn_skip(stream, type, sid, ssn) \ 400 ((stream)->type[sid].ssn = ssn + 1) 401 402 /* 403 * Pointers to address related SCTP functions. 404 * (i.e. things that depend on the address family.) 405 */ 406 struct sctp_af { 407 int (*sctp_xmit) (struct sk_buff *skb, 408 struct sctp_transport *); 409 int (*setsockopt) (struct sock *sk, 410 int level, 411 int optname, 412 char __user *optval, 413 unsigned int optlen); 414 int (*getsockopt) (struct sock *sk, 415 int level, 416 int optname, 417 char __user *optval, 418 int __user *optlen); 419 int (*compat_setsockopt) (struct sock *sk, 420 int level, 421 int optname, 422 char __user *optval, 423 unsigned int optlen); 424 int (*compat_getsockopt) (struct sock *sk, 425 int level, 426 int optname, 427 char __user *optval, 428 int __user *optlen); 429 void (*get_dst) (struct sctp_transport *t, 430 union sctp_addr *saddr, 431 struct flowi *fl, 432 struct sock *sk); 433 void (*get_saddr) (struct sctp_sock *sk, 434 struct sctp_transport *t, 435 struct flowi *fl); 436 void (*copy_addrlist) (struct list_head *, 437 struct net_device *); 438 int (*cmp_addr) (const union sctp_addr *addr1, 439 const union sctp_addr *addr2); 440 void (*addr_copy) (union sctp_addr *dst, 441 union sctp_addr *src); 442 void (*from_skb) (union sctp_addr *, 443 struct sk_buff *skb, 444 int saddr); 445 void (*from_sk) (union sctp_addr *, 446 struct sock *sk); 447 void (*from_addr_param) (union sctp_addr *, 448 union sctp_addr_param *, 449 __be16 port, int iif); 450 int (*to_addr_param) (const union sctp_addr *, 451 union sctp_addr_param *); 452 int (*addr_valid) (union sctp_addr *, 453 struct sctp_sock *, 454 const struct sk_buff *); 455 enum sctp_scope (*scope)(union sctp_addr *); 456 void (*inaddr_any) (union sctp_addr *, __be16); 457 int (*is_any) (const union sctp_addr *); 458 int (*available) (union sctp_addr *, 459 struct sctp_sock *); 460 int (*skb_iif) (const struct sk_buff *sk); 461 int (*is_ce) (const struct sk_buff *sk); 462 void (*seq_dump_addr)(struct seq_file *seq, 463 union sctp_addr *addr); 464 void (*ecn_capable)(struct sock *sk); 465 __u16 net_header_len; 466 int sockaddr_len; 467 sa_family_t sa_family; 468 struct list_head list; 469 }; 470 471 struct sctp_af *sctp_get_af_specific(sa_family_t); 472 int sctp_register_af(struct sctp_af *); 473 474 /* Protocol family functions. */ 475 struct sctp_pf { 476 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 477 void (*skb_msgname) (struct sk_buff *, char *, int *); 478 int (*af_supported) (sa_family_t, struct sctp_sock *); 479 int (*cmp_addr) (const union sctp_addr *, 480 const union sctp_addr *, 481 struct sctp_sock *); 482 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 483 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 484 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 485 struct sock *(*create_accept_sk) (struct sock *sk, 486 struct sctp_association *asoc, 487 bool kern); 488 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 489 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 490 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 491 struct sctp_af *af; 492 }; 493 494 495 /* Structure to track chunk fragments that have been acked, but peer 496 * fragments of the same message have not. 497 */ 498 struct sctp_datamsg { 499 /* Chunks waiting to be submitted to lower layer. */ 500 struct list_head chunks; 501 /* Reference counting. */ 502 refcount_t refcnt; 503 /* When is this message no longer interesting to the peer? */ 504 unsigned long expires_at; 505 /* Did the messenge fail to send? */ 506 int send_error; 507 u8 send_failed:1, 508 can_delay:1, /* should this message be Nagle delayed */ 509 abandoned:1; /* should this message be abandoned */ 510 }; 511 512 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 513 struct sctp_sndrcvinfo *, 514 struct iov_iter *); 515 void sctp_datamsg_free(struct sctp_datamsg *); 516 void sctp_datamsg_put(struct sctp_datamsg *); 517 void sctp_chunk_fail(struct sctp_chunk *, int error); 518 int sctp_chunk_abandoned(struct sctp_chunk *); 519 520 /* RFC2960 1.4 Key Terms 521 * 522 * o Chunk: A unit of information within an SCTP packet, consisting of 523 * a chunk header and chunk-specific content. 524 * 525 * As a matter of convenience, we remember the SCTP common header for 526 * each chunk as well as a few other header pointers... 527 */ 528 struct sctp_chunk { 529 struct list_head list; 530 531 refcount_t refcnt; 532 533 /* How many times this chunk have been sent, for prsctp RTX policy */ 534 int sent_count; 535 536 union { 537 /* This is our link to the per-transport transmitted list. */ 538 struct list_head transmitted_list; 539 /* List in specific stream outq */ 540 struct list_head stream_list; 541 }; 542 543 /* This field is used by chunks that hold fragmented data. 544 * For the first fragment this is the list that holds the rest of 545 * fragments. For the remaining fragments, this is the link to the 546 * frag_list maintained in the first fragment. 547 */ 548 struct list_head frag_list; 549 550 /* This points to the sk_buff containing the actual data. */ 551 struct sk_buff *skb; 552 553 /* In case of GSO packets, this will store the head one */ 554 struct sk_buff *head_skb; 555 556 /* These are the SCTP headers by reverse order in a packet. 557 * Note that some of these may happen more than once. In that 558 * case, we point at the "current" one, whatever that means 559 * for that level of header. 560 */ 561 562 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 563 union sctp_params param_hdr; 564 union { 565 __u8 *v; 566 struct sctp_datahdr *data_hdr; 567 struct sctp_inithdr *init_hdr; 568 struct sctp_sackhdr *sack_hdr; 569 struct sctp_heartbeathdr *hb_hdr; 570 struct sctp_sender_hb_info *hbs_hdr; 571 struct sctp_shutdownhdr *shutdown_hdr; 572 struct sctp_signed_cookie *cookie_hdr; 573 struct sctp_ecnehdr *ecne_hdr; 574 struct sctp_cwrhdr *ecn_cwr_hdr; 575 struct sctp_errhdr *err_hdr; 576 struct sctp_addiphdr *addip_hdr; 577 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 578 struct sctp_authhdr *auth_hdr; 579 struct sctp_idatahdr *idata_hdr; 580 } subh; 581 582 __u8 *chunk_end; 583 584 struct sctp_chunkhdr *chunk_hdr; 585 struct sctphdr *sctp_hdr; 586 587 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 588 struct sctp_sndrcvinfo sinfo; 589 590 /* Which association does this belong to? */ 591 struct sctp_association *asoc; 592 593 /* What endpoint received this chunk? */ 594 struct sctp_ep_common *rcvr; 595 596 /* We fill this in if we are calculating RTT. */ 597 unsigned long sent_at; 598 599 /* What is the origin IP address for this chunk? */ 600 union sctp_addr source; 601 /* Destination address for this chunk. */ 602 union sctp_addr dest; 603 604 /* For outbound message, track all fragments for SEND_FAILED. */ 605 struct sctp_datamsg *msg; 606 607 /* For an inbound chunk, this tells us where it came from. 608 * For an outbound chunk, it tells us where we'd like it to 609 * go. It is NULL if we have no preference. 610 */ 611 struct sctp_transport *transport; 612 613 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 614 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 615 * spec violates the principle premis that all chunks are processed 616 * in order. 617 */ 618 struct sk_buff *auth_chunk; 619 620 #define SCTP_CAN_FRTX 0x0 621 #define SCTP_NEED_FRTX 0x1 622 #define SCTP_DONT_FRTX 0x2 623 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 624 has_tsn:1, /* Does this chunk have a TSN yet? */ 625 has_ssn:1, /* Does this chunk have a SSN yet? */ 626 singleton:1, /* Only chunk in the packet? */ 627 end_of_packet:1, /* Last chunk in the packet? */ 628 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 629 pdiscard:1, /* Discard the whole packet now? */ 630 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 631 data_accepted:1, /* At least 1 chunk accepted */ 632 auth:1, /* IN: was auth'ed | OUT: needs auth */ 633 has_asconf:1, /* IN: have seen an asconf before */ 634 tsn_missing_report:2, /* Data chunk missing counter. */ 635 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 636 }; 637 638 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 639 void sctp_chunk_hold(struct sctp_chunk *); 640 void sctp_chunk_put(struct sctp_chunk *); 641 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 642 struct iov_iter *from); 643 void sctp_chunk_free(struct sctp_chunk *); 644 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 645 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 646 const struct sctp_association *, 647 struct sock *, gfp_t gfp); 648 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 649 union sctp_addr *); 650 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 651 652 static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) 653 { 654 return ntohs(ch->subh.data_hdr->stream); 655 } 656 657 enum { 658 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 659 SCTP_ADDR_SRC, /* address can be used as source */ 660 SCTP_ADDR_DEL, /* address about to be deleted */ 661 }; 662 663 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 664 struct sctp_sockaddr_entry { 665 struct list_head list; 666 struct rcu_head rcu; 667 union sctp_addr a; 668 __u8 state; 669 __u8 valid; 670 }; 671 672 #define SCTP_ADDRESS_TICK_DELAY 500 673 674 /* This structure holds lists of chunks as we are assembling for 675 * transmission. 676 */ 677 struct sctp_packet { 678 /* These are the SCTP header values (host order) for the packet. */ 679 __u16 source_port; 680 __u16 destination_port; 681 __u32 vtag; 682 683 /* This contains the payload chunks. */ 684 struct list_head chunk_list; 685 686 /* This is the overhead of the sctp and ip headers. */ 687 size_t overhead; 688 /* This is the total size of all chunks INCLUDING padding. */ 689 size_t size; 690 /* This is the maximum size this packet may have */ 691 size_t max_size; 692 693 /* The packet is destined for this transport address. 694 * The function we finally use to pass down to the next lower 695 * layer lives in the transport structure. 696 */ 697 struct sctp_transport *transport; 698 699 /* pointer to the auth chunk for this packet */ 700 struct sctp_chunk *auth; 701 702 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 703 has_sack:1, /* This packet contains a SACK chunk. */ 704 has_auth:1, /* This packet contains an AUTH chunk */ 705 has_data:1, /* This packet contains at least 1 DATA chunk */ 706 ipfragok:1; /* So let ip fragment this packet */ 707 }; 708 709 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 710 __u16 sport, __u16 dport); 711 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 712 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, 713 struct sctp_chunk *chunk, 714 int one_packet, gfp_t gfp); 715 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, 716 struct sctp_chunk *chunk); 717 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 718 void sctp_packet_free(struct sctp_packet *); 719 720 static inline int sctp_packet_empty(struct sctp_packet *packet) 721 { 722 return packet->size == packet->overhead; 723 } 724 725 /* This represents a remote transport address. 726 * For local transport addresses, we just use union sctp_addr. 727 * 728 * RFC2960 Section 1.4 Key Terms 729 * 730 * o Transport address: A Transport Address is traditionally defined 731 * by Network Layer address, Transport Layer protocol and Transport 732 * Layer port number. In the case of SCTP running over IP, a 733 * transport address is defined by the combination of an IP address 734 * and an SCTP port number (where SCTP is the Transport protocol). 735 * 736 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 737 * 738 * o The sender keeps a separate congestion control parameter set for 739 * each of the destination addresses it can send to (not each 740 * source-destination pair but for each destination). The parameters 741 * should decay if the address is not used for a long enough time 742 * period. 743 * 744 */ 745 struct sctp_transport { 746 /* A list of transports. */ 747 struct list_head transports; 748 struct rhlist_head node; 749 750 /* Reference counting. */ 751 refcount_t refcnt; 752 /* RTO-Pending : A flag used to track if one of the DATA 753 * chunks sent to this address is currently being 754 * used to compute a RTT. If this flag is 0, 755 * the next DATA chunk sent to this destination 756 * should be used to compute a RTT and this flag 757 * should be set. Every time the RTT 758 * calculation completes (i.e. the DATA chunk 759 * is SACK'd) clear this flag. 760 */ 761 __u32 rto_pending:1, 762 763 /* 764 * hb_sent : a flag that signals that we have a pending 765 * heartbeat. 766 */ 767 hb_sent:1, 768 769 /* Is the Path MTU update pending on this tranport */ 770 pmtu_pending:1, 771 772 dst_pending_confirm:1, /* need to confirm neighbour */ 773 774 /* Has this transport moved the ctsn since we last sacked */ 775 sack_generation:1; 776 u32 dst_cookie; 777 778 struct flowi fl; 779 780 /* This is the peer's IP address and port. */ 781 union sctp_addr ipaddr; 782 783 /* These are the functions we call to handle LLP stuff. */ 784 struct sctp_af *af_specific; 785 786 /* Which association do we belong to? */ 787 struct sctp_association *asoc; 788 789 /* RFC2960 790 * 791 * 12.3 Per Transport Address Data 792 * 793 * For each destination transport address in the peer's 794 * address list derived from the INIT or INIT ACK chunk, a 795 * number of data elements needs to be maintained including: 796 */ 797 /* RTO : The current retransmission timeout value. */ 798 unsigned long rto; 799 800 __u32 rtt; /* This is the most recent RTT. */ 801 802 /* RTTVAR : The current RTT variation. */ 803 __u32 rttvar; 804 805 /* SRTT : The current smoothed round trip time. */ 806 __u32 srtt; 807 808 /* 809 * These are the congestion stats. 810 */ 811 /* cwnd : The current congestion window. */ 812 __u32 cwnd; /* This is the actual cwnd. */ 813 814 /* ssthresh : The current slow start threshold value. */ 815 __u32 ssthresh; 816 817 /* partial : The tracking method for increase of cwnd when in 818 * bytes acked : congestion avoidance mode (see Section 6.2.2) 819 */ 820 __u32 partial_bytes_acked; 821 822 /* Data that has been sent, but not acknowledged. */ 823 __u32 flight_size; 824 825 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 826 827 /* Destination */ 828 struct dst_entry *dst; 829 /* Source address. */ 830 union sctp_addr saddr; 831 832 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 833 * the destination address every heartbeat interval. 834 */ 835 unsigned long hbinterval; 836 837 /* SACK delay timeout */ 838 unsigned long sackdelay; 839 __u32 sackfreq; 840 841 /* When was the last time that we heard from this transport? We use 842 * this to pick new active and retran paths. 843 */ 844 ktime_t last_time_heard; 845 846 /* When was the last time that we sent a chunk using this 847 * transport? We use this to check for idle transports 848 */ 849 unsigned long last_time_sent; 850 851 /* Last time(in jiffies) when cwnd is reduced due to the congestion 852 * indication based on ECNE chunk. 853 */ 854 unsigned long last_time_ecne_reduced; 855 856 /* This is the max_retrans value for the transport and will 857 * be initialized from the assocs value. This can be changed 858 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 859 */ 860 __u16 pathmaxrxt; 861 862 /* This is the partially failed retrans value for the transport 863 * and will be initialized from the assocs value. This can be changed 864 * using the SCTP_PEER_ADDR_THLDS socket option 865 */ 866 int pf_retrans; 867 /* PMTU : The current known path MTU. */ 868 __u32 pathmtu; 869 870 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 871 __u32 param_flags; 872 873 /* The number of times INIT has been sent on this transport. */ 874 int init_sent_count; 875 876 /* state : The current state of this destination, 877 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 878 */ 879 int state; 880 881 /* These are the error stats for this destination. */ 882 883 /* Error count : The current error count for this destination. */ 884 unsigned short error_count; 885 886 /* Per : A timer used by each destination. 887 * Destination : 888 * Timer : 889 * 890 * [Everywhere else in the text this is called T3-rtx. -ed] 891 */ 892 struct timer_list T3_rtx_timer; 893 894 /* Heartbeat timer is per destination. */ 895 struct timer_list hb_timer; 896 897 /* Timer to handle ICMP proto unreachable envets */ 898 struct timer_list proto_unreach_timer; 899 900 /* Timer to handler reconf chunk rtx */ 901 struct timer_list reconf_timer; 902 903 /* Since we're using per-destination retransmission timers 904 * (see above), we're also using per-destination "transmitted" 905 * queues. This probably ought to be a private struct 906 * accessible only within the outqueue, but it's not, yet. 907 */ 908 struct list_head transmitted; 909 910 /* We build bundle-able packets for this transport here. */ 911 struct sctp_packet packet; 912 913 /* This is the list of transports that have chunks to send. */ 914 struct list_head send_ready; 915 916 /* State information saved for SFR_CACC algorithm. The key 917 * idea in SFR_CACC is to maintain state at the sender on a 918 * per-destination basis when a changeover happens. 919 * char changeover_active; 920 * char cycling_changeover; 921 * __u32 next_tsn_at_change; 922 * char cacc_saw_newack; 923 */ 924 struct { 925 /* An unsigned integer, which stores the next TSN to be 926 * used by the sender, at the moment of changeover. 927 */ 928 __u32 next_tsn_at_change; 929 930 /* A flag which indicates the occurrence of a changeover */ 931 char changeover_active; 932 933 /* A flag which indicates whether the change of primary is 934 * the first switch to this destination address during an 935 * active switch. 936 */ 937 char cycling_changeover; 938 939 /* A temporary flag, which is used during the processing of 940 * a SACK to estimate the causative TSN(s)'s group. 941 */ 942 char cacc_saw_newack; 943 } cacc; 944 945 /* 64-bit random number sent with heartbeat. */ 946 __u64 hb_nonce; 947 948 struct rcu_head rcu; 949 }; 950 951 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 952 gfp_t); 953 void sctp_transport_set_owner(struct sctp_transport *, 954 struct sctp_association *); 955 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 956 struct sctp_sock *); 957 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 958 void sctp_transport_free(struct sctp_transport *); 959 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 960 void sctp_transport_reset_hb_timer(struct sctp_transport *); 961 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 962 int sctp_transport_hold(struct sctp_transport *); 963 void sctp_transport_put(struct sctp_transport *); 964 void sctp_transport_update_rto(struct sctp_transport *, __u32); 965 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 966 void sctp_transport_lower_cwnd(struct sctp_transport *t, 967 enum sctp_lower_cwnd reason); 968 void sctp_transport_burst_limited(struct sctp_transport *); 969 void sctp_transport_burst_reset(struct sctp_transport *); 970 unsigned long sctp_transport_timeout(struct sctp_transport *); 971 void sctp_transport_reset(struct sctp_transport *t); 972 void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); 973 void sctp_transport_immediate_rtx(struct sctp_transport *); 974 void sctp_transport_dst_release(struct sctp_transport *t); 975 void sctp_transport_dst_confirm(struct sctp_transport *t); 976 977 978 /* This is the structure we use to queue packets as they come into 979 * SCTP. We write packets to it and read chunks from it. 980 */ 981 struct sctp_inq { 982 /* This is actually a queue of sctp_chunk each 983 * containing a partially decoded packet. 984 */ 985 struct list_head in_chunk_list; 986 /* This is the packet which is currently off the in queue and is 987 * being worked on through the inbound chunk processing. 988 */ 989 struct sctp_chunk *in_progress; 990 991 /* This is the delayed task to finish delivering inbound 992 * messages. 993 */ 994 struct work_struct immediate; 995 }; 996 997 void sctp_inq_init(struct sctp_inq *); 998 void sctp_inq_free(struct sctp_inq *); 999 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1000 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1001 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1002 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1003 1004 /* This is the structure we use to hold outbound chunks. You push 1005 * chunks in and they automatically pop out the other end as bundled 1006 * packets (it calls (*output_handler)()). 1007 * 1008 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1009 * and 8.2 of the v13 draft. 1010 * 1011 * It handles retransmissions. The connection to the timeout portion 1012 * of the state machine is through sctp_..._timeout() and timeout_handler. 1013 * 1014 * If you feed it SACKs, it will eat them. 1015 * 1016 * If you give it big chunks, it will fragment them. 1017 * 1018 * It assigns TSN's to data chunks. This happens at the last possible 1019 * instant before transmission. 1020 * 1021 * When free()'d, it empties itself out via output_handler(). 1022 */ 1023 struct sctp_outq { 1024 struct sctp_association *asoc; 1025 1026 /* Data pending that has never been transmitted. */ 1027 struct list_head out_chunk_list; 1028 1029 /* Stream scheduler being used */ 1030 struct sctp_sched_ops *sched; 1031 1032 unsigned int out_qlen; /* Total length of queued data chunks. */ 1033 1034 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1035 unsigned int error; 1036 1037 /* These are control chunks we want to send. */ 1038 struct list_head control_chunk_list; 1039 1040 /* These are chunks that have been sacked but are above the 1041 * CTSN, or cumulative tsn ack point. 1042 */ 1043 struct list_head sacked; 1044 1045 /* Put chunks on this list to schedule them for 1046 * retransmission. 1047 */ 1048 struct list_head retransmit; 1049 1050 /* Put chunks on this list to save them for FWD TSN processing as 1051 * they were abandoned. 1052 */ 1053 struct list_head abandoned; 1054 1055 /* How many unackd bytes do we have in-flight? */ 1056 __u32 outstanding_bytes; 1057 1058 /* Are we doing fast-rtx on this queue */ 1059 char fast_rtx; 1060 1061 /* Corked? */ 1062 char cork; 1063 }; 1064 1065 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1066 void sctp_outq_teardown(struct sctp_outq *); 1067 void sctp_outq_free(struct sctp_outq*); 1068 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1069 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1070 int sctp_outq_is_empty(const struct sctp_outq *); 1071 void sctp_outq_restart(struct sctp_outq *); 1072 1073 void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, 1074 enum sctp_retransmit_reason reason); 1075 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1076 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1077 void sctp_prsctp_prune(struct sctp_association *asoc, 1078 struct sctp_sndrcvinfo *sinfo, int msg_len); 1079 /* Uncork and flush an outqueue. */ 1080 static inline void sctp_outq_cork(struct sctp_outq *q) 1081 { 1082 q->cork = 1; 1083 } 1084 1085 /* SCTP skb control block. 1086 * sctp_input_cb is currently used on rx and sock rx queue 1087 */ 1088 struct sctp_input_cb { 1089 union { 1090 struct inet_skb_parm h4; 1091 #if IS_ENABLED(CONFIG_IPV6) 1092 struct inet6_skb_parm h6; 1093 #endif 1094 } header; 1095 struct sctp_chunk *chunk; 1096 struct sctp_af *af; 1097 }; 1098 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1099 1100 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1101 { 1102 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1103 1104 return chunk->head_skb ? : skb; 1105 } 1106 1107 /* These bind address data fields common between endpoints and associations */ 1108 struct sctp_bind_addr { 1109 1110 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1111 * 1112 * SCTP Port: The local SCTP port number the endpoint is 1113 * bound to. 1114 */ 1115 __u16 port; 1116 1117 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1118 * 1119 * Address List: The list of IP addresses that this instance 1120 * has bound. This information is passed to one's 1121 * peer(s) in INIT and INIT ACK chunks. 1122 */ 1123 struct list_head address_list; 1124 }; 1125 1126 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1127 void sctp_bind_addr_free(struct sctp_bind_addr *); 1128 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1129 const struct sctp_bind_addr *src, 1130 enum sctp_scope scope, gfp_t gfp, 1131 int flags); 1132 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1133 const struct sctp_bind_addr *src, 1134 gfp_t gfp); 1135 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1136 int new_size, __u8 addr_state, gfp_t gfp); 1137 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1138 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1139 struct sctp_sock *); 1140 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1141 struct sctp_sock *, struct sctp_sock *); 1142 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1143 const union sctp_addr *addr); 1144 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1145 const union sctp_addr *addrs, 1146 int addrcnt, 1147 struct sctp_sock *opt); 1148 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1149 int *addrs_len, 1150 gfp_t gfp); 1151 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1152 __u16 port, gfp_t gfp); 1153 1154 enum sctp_scope sctp_scope(const union sctp_addr *addr); 1155 int sctp_in_scope(struct net *net, const union sctp_addr *addr, 1156 const enum sctp_scope scope); 1157 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1158 int sctp_is_ep_boundall(struct sock *sk); 1159 1160 1161 /* What type of endpoint? */ 1162 enum sctp_endpoint_type { 1163 SCTP_EP_TYPE_SOCKET, 1164 SCTP_EP_TYPE_ASSOCIATION, 1165 }; 1166 1167 /* 1168 * A common base class to bridge the implmentation view of a 1169 * socket (usually listening) endpoint versus an association's 1170 * local endpoint. 1171 * This common structure is useful for several purposes: 1172 * 1) Common interface for lookup routines. 1173 * a) Subfunctions work for either endpoint or association 1174 * b) Single interface to lookup allows hiding the lookup lock rather 1175 * than acquiring it externally. 1176 * 2) Common interface for the inbound chunk handling/state machine. 1177 * 3) Common object handling routines for reference counting, etc. 1178 * 4) Disentangle association lookup from endpoint lookup, where we 1179 * do not have to find our endpoint to find our association. 1180 * 1181 */ 1182 1183 struct sctp_ep_common { 1184 /* Fields to help us manage our entries in the hash tables. */ 1185 struct hlist_node node; 1186 int hashent; 1187 1188 /* Runtime type information. What kind of endpoint is this? */ 1189 enum sctp_endpoint_type type; 1190 1191 /* Some fields to help us manage this object. 1192 * refcnt - Reference count access to this object. 1193 * dead - Do not attempt to use this object. 1194 */ 1195 refcount_t refcnt; 1196 bool dead; 1197 1198 /* What socket does this endpoint belong to? */ 1199 struct sock *sk; 1200 1201 /* This is where we receive inbound chunks. */ 1202 struct sctp_inq inqueue; 1203 1204 /* This substructure includes the defining parameters of the 1205 * endpoint: 1206 * bind_addr.port is our shared port number. 1207 * bind_addr.address_list is our set of local IP addresses. 1208 */ 1209 struct sctp_bind_addr bind_addr; 1210 }; 1211 1212 1213 /* RFC Section 1.4 Key Terms 1214 * 1215 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1216 * multi-homed host, an SCTP endpoint is represented to its peers as a 1217 * combination of a set of eligible destination transport addresses to 1218 * which SCTP packets can be sent and a set of eligible source 1219 * transport addresses from which SCTP packets can be received. 1220 * All transport addresses used by an SCTP endpoint must use the 1221 * same port number, but can use multiple IP addresses. A transport 1222 * address used by an SCTP endpoint must not be used by another 1223 * SCTP endpoint. In other words, a transport address is unique 1224 * to an SCTP endpoint. 1225 * 1226 * From an implementation perspective, each socket has one of these. 1227 * A TCP-style socket will have exactly one association on one of 1228 * these. An UDP-style socket will have multiple associations hanging 1229 * off one of these. 1230 */ 1231 1232 struct sctp_endpoint { 1233 /* Common substructure for endpoint and association. */ 1234 struct sctp_ep_common base; 1235 1236 /* Associations: A list of current associations and mappings 1237 * to the data consumers for each association. This 1238 * may be in the form of a hash table or other 1239 * implementation dependent structure. The data 1240 * consumers may be process identification 1241 * information such as file descriptors, named pipe 1242 * pointer, or table pointers dependent on how SCTP 1243 * is implemented. 1244 */ 1245 /* This is really a list of struct sctp_association entries. */ 1246 struct list_head asocs; 1247 1248 /* Secret Key: A secret key used by this endpoint to compute 1249 * the MAC. This SHOULD be a cryptographic quality 1250 * random number with a sufficient length. 1251 * Discussion in [RFC1750] can be helpful in 1252 * selection of the key. 1253 */ 1254 __u8 secret_key[SCTP_SECRET_SIZE]; 1255 1256 /* digest: This is a digest of the sctp cookie. This field is 1257 * only used on the receive path when we try to validate 1258 * that the cookie has not been tampered with. We put 1259 * this here so we pre-allocate this once and can re-use 1260 * on every receive. 1261 */ 1262 __u8 *digest; 1263 1264 /* sendbuf acct. policy. */ 1265 __u32 sndbuf_policy; 1266 1267 /* rcvbuf acct. policy. */ 1268 __u32 rcvbuf_policy; 1269 1270 /* SCTP AUTH: array of the HMACs that will be allocated 1271 * we need this per association so that we don't serialize 1272 */ 1273 struct crypto_shash **auth_hmacs; 1274 1275 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1276 struct sctp_hmac_algo_param *auth_hmacs_list; 1277 1278 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1279 struct sctp_chunks_param *auth_chunk_list; 1280 1281 /* SCTP-AUTH: endpoint shared keys */ 1282 struct list_head endpoint_shared_keys; 1283 __u16 active_key_id; 1284 __u8 auth_enable:1, 1285 prsctp_enable:1, 1286 reconf_enable:1; 1287 1288 __u8 strreset_enable; 1289 }; 1290 1291 /* Recover the outter endpoint structure. */ 1292 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1293 { 1294 struct sctp_endpoint *ep; 1295 1296 ep = container_of(base, struct sctp_endpoint, base); 1297 return ep; 1298 } 1299 1300 /* These are function signatures for manipulating endpoints. */ 1301 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1302 void sctp_endpoint_free(struct sctp_endpoint *); 1303 void sctp_endpoint_put(struct sctp_endpoint *); 1304 void sctp_endpoint_hold(struct sctp_endpoint *); 1305 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1306 struct sctp_association *sctp_endpoint_lookup_assoc( 1307 const struct sctp_endpoint *ep, 1308 const union sctp_addr *paddr, 1309 struct sctp_transport **); 1310 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1311 const union sctp_addr *); 1312 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1313 struct net *, const union sctp_addr *); 1314 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1315 const union sctp_addr *paddr); 1316 1317 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1318 const struct sctp_association *asoc, 1319 enum sctp_cid cid, struct sctp_init_chunk *peer_init, 1320 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1321 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1322 const union sctp_addr *peer, 1323 struct sctp_init_chunk *init, gfp_t gfp); 1324 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1325 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1326 1327 struct sctp_inithdr_host { 1328 __u32 init_tag; 1329 __u32 a_rwnd; 1330 __u16 num_outbound_streams; 1331 __u16 num_inbound_streams; 1332 __u32 initial_tsn; 1333 }; 1334 1335 struct sctp_stream_priorities { 1336 /* List of priorities scheduled */ 1337 struct list_head prio_sched; 1338 /* List of streams scheduled */ 1339 struct list_head active; 1340 /* The next stream stream in line */ 1341 struct sctp_stream_out_ext *next; 1342 __u16 prio; 1343 }; 1344 1345 struct sctp_stream_out_ext { 1346 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1347 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1348 struct list_head outq; /* chunks enqueued by this stream */ 1349 union { 1350 struct { 1351 /* Scheduled streams list */ 1352 struct list_head prio_list; 1353 struct sctp_stream_priorities *prio_head; 1354 }; 1355 /* Fields used by RR scheduler */ 1356 struct { 1357 struct list_head rr_list; 1358 }; 1359 }; 1360 }; 1361 1362 struct sctp_stream_out { 1363 __u16 ssn; 1364 __u8 state; 1365 struct sctp_stream_out_ext *ext; 1366 }; 1367 1368 struct sctp_stream_in { 1369 __u16 ssn; 1370 }; 1371 1372 struct sctp_stream { 1373 struct sctp_stream_out *out; 1374 struct sctp_stream_in *in; 1375 __u16 outcnt; 1376 __u16 incnt; 1377 /* Current stream being sent, if any */ 1378 struct sctp_stream_out *out_curr; 1379 union { 1380 /* Fields used by priority scheduler */ 1381 struct { 1382 /* List of priorities scheduled */ 1383 struct list_head prio_list; 1384 }; 1385 /* Fields used by RR scheduler */ 1386 struct { 1387 /* List of streams scheduled */ 1388 struct list_head rr_list; 1389 /* The next stream stream in line */ 1390 struct sctp_stream_out_ext *rr_next; 1391 }; 1392 }; 1393 struct sctp_stream_interleave *si; 1394 }; 1395 1396 #define SCTP_STREAM_CLOSED 0x00 1397 #define SCTP_STREAM_OPEN 0x01 1398 1399 static inline __u16 sctp_datachk_len(const struct sctp_stream *stream) 1400 { 1401 return stream->si->data_chunk_len; 1402 } 1403 1404 static inline __u16 sctp_datahdr_len(const struct sctp_stream *stream) 1405 { 1406 return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr); 1407 } 1408 1409 /* SCTP_GET_ASSOC_STATS counters */ 1410 struct sctp_priv_assoc_stats { 1411 /* Maximum observed rto in the association during subsequent 1412 * observations. Value is set to 0 if no RTO measurement took place 1413 * The transport where the max_rto was observed is returned in 1414 * obs_rto_ipaddr 1415 */ 1416 struct sockaddr_storage obs_rto_ipaddr; 1417 __u64 max_obs_rto; 1418 /* Total In and Out SACKs received and sent */ 1419 __u64 isacks; 1420 __u64 osacks; 1421 /* Total In and Out packets received and sent */ 1422 __u64 opackets; 1423 __u64 ipackets; 1424 /* Total retransmitted chunks */ 1425 __u64 rtxchunks; 1426 /* TSN received > next expected */ 1427 __u64 outofseqtsns; 1428 /* Duplicate Chunks received */ 1429 __u64 idupchunks; 1430 /* Gap Ack Blocks received */ 1431 __u64 gapcnt; 1432 /* Unordered data chunks sent and received */ 1433 __u64 ouodchunks; 1434 __u64 iuodchunks; 1435 /* Ordered data chunks sent and received */ 1436 __u64 oodchunks; 1437 __u64 iodchunks; 1438 /* Control chunks sent and received */ 1439 __u64 octrlchunks; 1440 __u64 ictrlchunks; 1441 }; 1442 1443 /* RFC2960 1444 * 1445 * 12. Recommended Transmission Control Block (TCB) Parameters 1446 * 1447 * This section details a recommended set of parameters that should 1448 * be contained within the TCB for an implementation. This section is 1449 * for illustrative purposes and should not be deemed as requirements 1450 * on an implementation or as an exhaustive list of all parameters 1451 * inside an SCTP TCB. Each implementation may need its own additional 1452 * parameters for optimization. 1453 */ 1454 1455 1456 /* Here we have information about each individual association. */ 1457 struct sctp_association { 1458 1459 /* A base structure common to endpoint and association. 1460 * In this context, it represents the associations's view 1461 * of the local endpoint of the association. 1462 */ 1463 struct sctp_ep_common base; 1464 1465 /* Associations on the same socket. */ 1466 struct list_head asocs; 1467 1468 /* association id. */ 1469 sctp_assoc_t assoc_id; 1470 1471 /* This is our parent endpoint. */ 1472 struct sctp_endpoint *ep; 1473 1474 /* These are those association elements needed in the cookie. */ 1475 struct sctp_cookie c; 1476 1477 /* This is all information about our peer. */ 1478 struct { 1479 /* transport_addr_list 1480 * 1481 * Peer : A list of SCTP transport addresses that the 1482 * Transport : peer is bound to. This information is derived 1483 * Address : from the INIT or INIT ACK and is used to 1484 * List : associate an inbound packet with a given 1485 * : association. Normally this information is 1486 * : hashed or keyed for quick lookup and access 1487 * : of the TCB. 1488 * : The list is also initialized with the list 1489 * : of addresses passed with the sctp_connectx() 1490 * : call. 1491 * 1492 * It is a list of SCTP_transport's. 1493 */ 1494 struct list_head transport_addr_list; 1495 1496 /* rwnd 1497 * 1498 * Peer Rwnd : Current calculated value of the peer's rwnd. 1499 */ 1500 __u32 rwnd; 1501 1502 /* transport_count 1503 * 1504 * Peer : A count of the number of peer addresses 1505 * Transport : in the Peer Transport Address List. 1506 * Address : 1507 * Count : 1508 */ 1509 __u16 transport_count; 1510 1511 /* port 1512 * The transport layer port number. 1513 */ 1514 __u16 port; 1515 1516 /* primary_path 1517 * 1518 * Primary : This is the current primary destination 1519 * Path : transport address of the peer endpoint. It 1520 * : may also specify a source transport address 1521 * : on this endpoint. 1522 * 1523 * All of these paths live on transport_addr_list. 1524 * 1525 * At the bakeoffs, we discovered that the intent of 1526 * primaryPath is that it only changes when the ULP 1527 * asks to have it changed. We add the activePath to 1528 * designate the connection we are currently using to 1529 * transmit new data and most control chunks. 1530 */ 1531 struct sctp_transport *primary_path; 1532 1533 /* Cache the primary path address here, when we 1534 * need a an address for msg_name. 1535 */ 1536 union sctp_addr primary_addr; 1537 1538 /* active_path 1539 * The path that we are currently using to 1540 * transmit new data and most control chunks. 1541 */ 1542 struct sctp_transport *active_path; 1543 1544 /* retran_path 1545 * 1546 * RFC2960 6.4 Multi-homed SCTP Endpoints 1547 * ... 1548 * Furthermore, when its peer is multi-homed, an 1549 * endpoint SHOULD try to retransmit a chunk to an 1550 * active destination transport address that is 1551 * different from the last destination address to 1552 * which the DATA chunk was sent. 1553 */ 1554 struct sctp_transport *retran_path; 1555 1556 /* Pointer to last transport I have sent on. */ 1557 struct sctp_transport *last_sent_to; 1558 1559 /* This is the last transport I have received DATA on. */ 1560 struct sctp_transport *last_data_from; 1561 1562 /* 1563 * Mapping An array of bits or bytes indicating which out of 1564 * Array order TSN's have been received (relative to the 1565 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1566 * order packets have been received, this array 1567 * will be set to all zero. This structure may be 1568 * in the form of a circular buffer or bit array. 1569 * 1570 * Last Rcvd : This is the last TSN received in 1571 * TSN : sequence. This value is set initially by 1572 * : taking the peer's Initial TSN, received in 1573 * : the INIT or INIT ACK chunk, and subtracting 1574 * : one from it. 1575 * 1576 * Throughout most of the specification this is called the 1577 * "Cumulative TSN ACK Point". In this case, we 1578 * ignore the advice in 12.2 in favour of the term 1579 * used in the bulk of the text. This value is hidden 1580 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1581 */ 1582 struct sctp_tsnmap tsn_map; 1583 1584 /* This mask is used to disable sending the ASCONF chunk 1585 * with specified parameter to peer. 1586 */ 1587 __be16 addip_disabled_mask; 1588 1589 /* These are capabilities which our peer advertised. */ 1590 __u8 ecn_capable:1, /* Can peer do ECN? */ 1591 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1592 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1593 hostname_address:1, /* Peer understands DNS addresses? */ 1594 asconf_capable:1, /* Does peer support ADDIP? */ 1595 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1596 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1597 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1598 1599 /* sack_needed : This flag indicates if the next received 1600 * : packet is to be responded to with a 1601 * : SACK. This is initialized to 0. When a packet 1602 * : is received sack_cnt is incremented. If this value 1603 * : reaches 2 or more, a SACK is sent and the 1604 * : value is reset to 0. Note: This is used only 1605 * : when no DATA chunks are received out of 1606 * : order. When DATA chunks are out of order, 1607 * : SACK's are not delayed (see Section 6). 1608 */ 1609 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1610 sack_generation:1, 1611 zero_window_announced:1; 1612 __u32 sack_cnt; 1613 1614 __u32 adaptation_ind; /* Adaptation Code point. */ 1615 1616 struct sctp_inithdr_host i; 1617 void *cookie; 1618 int cookie_len; 1619 1620 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1621 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1622 * Initial TSN Value minus 1 1623 */ 1624 __u32 addip_serial; 1625 1626 /* SCTP-AUTH: We need to know pears random number, hmac list 1627 * and authenticated chunk list. All that is part of the 1628 * cookie and these are just pointers to those locations 1629 */ 1630 struct sctp_random_param *peer_random; 1631 struct sctp_chunks_param *peer_chunks; 1632 struct sctp_hmac_algo_param *peer_hmacs; 1633 } peer; 1634 1635 /* State : A state variable indicating what state the 1636 * : association is in, i.e. COOKIE-WAIT, 1637 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1638 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1639 * 1640 * Note: No "CLOSED" state is illustrated since if a 1641 * association is "CLOSED" its TCB SHOULD be removed. 1642 * 1643 * In this implementation we DO have a CLOSED 1644 * state which is used during initiation and shutdown. 1645 * 1646 * State takes values from SCTP_STATE_*. 1647 */ 1648 enum sctp_state state; 1649 1650 /* Overall : The overall association error count. 1651 * Error Count : [Clear this any time I get something.] 1652 */ 1653 int overall_error_count; 1654 1655 /* The cookie life I award for any cookie. */ 1656 ktime_t cookie_life; 1657 1658 /* These are the association's initial, max, and min RTO values. 1659 * These values will be initialized by system defaults, but can 1660 * be modified via the SCTP_RTOINFO socket option. 1661 */ 1662 unsigned long rto_initial; 1663 unsigned long rto_max; 1664 unsigned long rto_min; 1665 1666 /* Maximum number of new data packets that can be sent in a burst. */ 1667 int max_burst; 1668 1669 /* This is the max_retrans value for the association. This value will 1670 * be initialized initialized from system defaults, but can be 1671 * modified by the SCTP_ASSOCINFO socket option. 1672 */ 1673 int max_retrans; 1674 1675 /* This is the partially failed retrans value for the transport 1676 * and will be initialized from the assocs value. This can be 1677 * changed using the SCTP_PEER_ADDR_THLDS socket option 1678 */ 1679 int pf_retrans; 1680 1681 /* Maximum number of times the endpoint will retransmit INIT */ 1682 __u16 max_init_attempts; 1683 1684 /* How many times have we resent an INIT? */ 1685 __u16 init_retries; 1686 1687 /* The largest timeout or RTO value to use in attempting an INIT */ 1688 unsigned long max_init_timeo; 1689 1690 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1691 * the destination address every heartbeat interval. This value 1692 * will be inherited by all new transports. 1693 */ 1694 unsigned long hbinterval; 1695 1696 /* This is the max_retrans value for new transports in the 1697 * association. 1698 */ 1699 __u16 pathmaxrxt; 1700 1701 /* Flag that path mtu update is pending */ 1702 __u8 pmtu_pending; 1703 1704 /* Association : The smallest PMTU discovered for all of the 1705 * PMTU : peer's transport addresses. 1706 */ 1707 __u32 pathmtu; 1708 1709 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1710 __u32 param_flags; 1711 1712 __u32 sackfreq; 1713 /* SACK delay timeout */ 1714 unsigned long sackdelay; 1715 1716 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1717 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1718 1719 /* Transport to which SHUTDOWN chunk was last sent. */ 1720 struct sctp_transport *shutdown_last_sent_to; 1721 1722 /* Transport to which INIT chunk was last sent. */ 1723 struct sctp_transport *init_last_sent_to; 1724 1725 /* How many times have we resent a SHUTDOWN */ 1726 int shutdown_retries; 1727 1728 /* Next TSN : The next TSN number to be assigned to a new 1729 * : DATA chunk. This is sent in the INIT or INIT 1730 * : ACK chunk to the peer and incremented each 1731 * : time a DATA chunk is assigned a TSN 1732 * : (normally just prior to transmit or during 1733 * : fragmentation). 1734 */ 1735 __u32 next_tsn; 1736 1737 /* 1738 * Last Rcvd : This is the last TSN received in sequence. This value 1739 * TSN : is set initially by taking the peer's Initial TSN, 1740 * : received in the INIT or INIT ACK chunk, and 1741 * : subtracting one from it. 1742 * 1743 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1744 */ 1745 1746 __u32 ctsn_ack_point; 1747 1748 /* PR-SCTP Advanced.Peer.Ack.Point */ 1749 __u32 adv_peer_ack_point; 1750 1751 /* Highest TSN that is acknowledged by incoming SACKs. */ 1752 __u32 highest_sacked; 1753 1754 /* TSN marking the fast recovery exit point */ 1755 __u32 fast_recovery_exit; 1756 1757 /* Flag to track the current fast recovery state */ 1758 __u8 fast_recovery; 1759 1760 /* The number of unacknowledged data chunks. Reported through 1761 * the SCTP_STATUS sockopt. 1762 */ 1763 __u16 unack_data; 1764 1765 /* The total number of data chunks that we've had to retransmit 1766 * as the result of a T3 timer expiration 1767 */ 1768 __u32 rtx_data_chunks; 1769 1770 /* This is the association's receive buffer space. This value is used 1771 * to set a_rwnd field in an INIT or a SACK chunk. 1772 */ 1773 __u32 rwnd; 1774 1775 /* This is the last advertised value of rwnd over a SACK chunk. */ 1776 __u32 a_rwnd; 1777 1778 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1779 * to slop over a maximum of the association's frag_point. 1780 */ 1781 __u32 rwnd_over; 1782 1783 /* Keeps treack of rwnd pressure. This happens when we have 1784 * a window, but not recevie buffer (i.e small packets). This one 1785 * is releases slowly (1 PMTU at a time ). 1786 */ 1787 __u32 rwnd_press; 1788 1789 /* This is the sndbuf size in use for the association. 1790 * This corresponds to the sndbuf size for the association, 1791 * as specified in the sk->sndbuf. 1792 */ 1793 int sndbuf_used; 1794 1795 /* This is the amount of memory that this association has allocated 1796 * in the receive path at any given time. 1797 */ 1798 atomic_t rmem_alloc; 1799 1800 /* This is the wait queue head for send requests waiting on 1801 * the association sndbuf space. 1802 */ 1803 wait_queue_head_t wait; 1804 1805 /* The message size at which SCTP fragmentation will occur. */ 1806 __u32 frag_point; 1807 __u32 user_frag; 1808 1809 /* Counter used to count INIT errors. */ 1810 int init_err_counter; 1811 1812 /* Count the number of INIT cycles (for doubling timeout). */ 1813 int init_cycle; 1814 1815 /* Default send parameters. */ 1816 __u16 default_stream; 1817 __u16 default_flags; 1818 __u32 default_ppid; 1819 __u32 default_context; 1820 __u32 default_timetolive; 1821 1822 /* Default receive parameters */ 1823 __u32 default_rcv_context; 1824 1825 /* Stream arrays */ 1826 struct sctp_stream stream; 1827 1828 /* All outbound chunks go through this structure. */ 1829 struct sctp_outq outqueue; 1830 1831 /* A smart pipe that will handle reordering and fragmentation, 1832 * as well as handle passing events up to the ULP. 1833 */ 1834 struct sctp_ulpq ulpq; 1835 1836 /* Last TSN that caused an ECNE Chunk to be sent. */ 1837 __u32 last_ecne_tsn; 1838 1839 /* Last TSN that caused a CWR Chunk to be sent. */ 1840 __u32 last_cwr_tsn; 1841 1842 /* How many duplicated TSNs have we seen? */ 1843 int numduptsns; 1844 1845 /* These are to support 1846 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1847 * and Enforcement of Flow and Message Limits" 1848 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1849 * or "ADDIP" for short. 1850 */ 1851 1852 1853 1854 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1855 * 1856 * R1) One and only one ASCONF Chunk MAY be in transit and 1857 * unacknowledged at any one time. If a sender, after sending 1858 * an ASCONF chunk, decides it needs to transfer another 1859 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1860 * returns from the previous ASCONF Chunk before sending a 1861 * subsequent ASCONF. Note this restriction binds each side, 1862 * so at any time two ASCONF may be in-transit on any given 1863 * association (one sent from each endpoint). 1864 * 1865 * [This is our one-and-only-one ASCONF in flight. If we do 1866 * not have an ASCONF in flight, this is NULL.] 1867 */ 1868 struct sctp_chunk *addip_last_asconf; 1869 1870 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1871 * 1872 * This is needed to implement itmes E1 - E4 of the updated 1873 * spec. Here is the justification: 1874 * 1875 * Since the peer may bundle multiple ASCONF chunks toward us, 1876 * we now need the ability to cache multiple ACKs. The section 1877 * describes in detail how they are cached and cleaned up. 1878 */ 1879 struct list_head asconf_ack_list; 1880 1881 /* These ASCONF chunks are waiting to be sent. 1882 * 1883 * These chunaks can't be pushed to outqueue until receiving 1884 * ASCONF_ACK for the previous ASCONF indicated by 1885 * addip_last_asconf, so as to guarantee that only one ASCONF 1886 * is in flight at any time. 1887 * 1888 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1889 * 1890 * In defining the ASCONF Chunk transfer procedures, it is 1891 * essential that these transfers MUST NOT cause congestion 1892 * within the network. To achieve this, we place these 1893 * restrictions on the transfer of ASCONF Chunks: 1894 * 1895 * R1) One and only one ASCONF Chunk MAY be in transit and 1896 * unacknowledged at any one time. If a sender, after sending 1897 * an ASCONF chunk, decides it needs to transfer another 1898 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1899 * returns from the previous ASCONF Chunk before sending a 1900 * subsequent ASCONF. Note this restriction binds each side, 1901 * so at any time two ASCONF may be in-transit on any given 1902 * association (one sent from each endpoint). 1903 * 1904 * 1905 * [I really think this is EXACTLY the sort of intelligence 1906 * which already resides in sctp_outq. Please move this 1907 * queue and its supporting logic down there. --piggy] 1908 */ 1909 struct list_head addip_chunk_list; 1910 1911 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1912 * 1913 * A2) A serial number should be assigned to the Chunk. The 1914 * serial number SHOULD be a monotonically increasing 1915 * number. The serial number SHOULD be initialized at 1916 * the start of the association to the same value as the 1917 * Initial TSN and every time a new ASCONF chunk is created 1918 * it is incremented by one after assigning the serial number 1919 * to the newly created chunk. 1920 * 1921 * ADDIP 1922 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1923 * 1924 * Serial Number : 32 bits (unsigned integer) 1925 * 1926 * This value represents a Serial Number for the ASCONF 1927 * Chunk. The valid range of Serial Number is from 0 to 1928 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1929 * after reaching 4294967295. 1930 */ 1931 __u32 addip_serial; 1932 int src_out_of_asoc_ok; 1933 union sctp_addr *asconf_addr_del_pending; 1934 struct sctp_transport *new_transport; 1935 1936 /* SCTP AUTH: list of the endpoint shared keys. These 1937 * keys are provided out of band by the user applicaton 1938 * and can't change during the lifetime of the association 1939 */ 1940 struct list_head endpoint_shared_keys; 1941 1942 /* SCTP AUTH: 1943 * The current generated assocaition shared key (secret) 1944 */ 1945 struct sctp_auth_bytes *asoc_shared_key; 1946 1947 /* SCTP AUTH: hmac id of the first peer requested algorithm 1948 * that we support. 1949 */ 1950 __u16 default_hmac_id; 1951 1952 __u16 active_key_id; 1953 1954 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1955 temp:1, /* Is it a temporary association? */ 1956 force_delay:1, 1957 intl_enable:1, 1958 prsctp_enable:1, 1959 reconf_enable:1; 1960 1961 __u8 strreset_enable; 1962 __u8 strreset_outstanding; /* request param count on the fly */ 1963 1964 __u32 strreset_outseq; /* Update after receiving response */ 1965 __u32 strreset_inseq; /* Update after receiving request */ 1966 __u32 strreset_result[2]; /* save the results of last 2 responses */ 1967 1968 struct sctp_chunk *strreset_chunk; /* save request chunk */ 1969 1970 struct sctp_priv_assoc_stats stats; 1971 1972 int sent_cnt_removable; 1973 1974 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1975 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1976 }; 1977 1978 1979 /* An eyecatcher for determining if we are really looking at an 1980 * association data structure. 1981 */ 1982 enum { 1983 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1984 }; 1985 1986 /* Recover the outter association structure. */ 1987 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1988 { 1989 struct sctp_association *asoc; 1990 1991 asoc = container_of(base, struct sctp_association, base); 1992 return asoc; 1993 } 1994 1995 /* These are function signatures for manipulating associations. */ 1996 1997 1998 struct sctp_association * 1999 sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, 2000 enum sctp_scope scope, gfp_t gfp); 2001 void sctp_association_free(struct sctp_association *); 2002 void sctp_association_put(struct sctp_association *); 2003 void sctp_association_hold(struct sctp_association *); 2004 2005 struct sctp_transport *sctp_assoc_choose_alter_transport( 2006 struct sctp_association *, struct sctp_transport *); 2007 void sctp_assoc_update_retran_path(struct sctp_association *); 2008 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 2009 const union sctp_addr *); 2010 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 2011 const union sctp_addr *laddr); 2012 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 2013 const union sctp_addr *address, 2014 const gfp_t gfp, 2015 const int peer_state); 2016 void sctp_assoc_del_peer(struct sctp_association *asoc, 2017 const union sctp_addr *addr); 2018 void sctp_assoc_rm_peer(struct sctp_association *asoc, 2019 struct sctp_transport *peer); 2020 void sctp_assoc_control_transport(struct sctp_association *asoc, 2021 struct sctp_transport *transport, 2022 enum sctp_transport_cmd command, 2023 sctp_sn_error_t error); 2024 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 2025 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 2026 struct net *, 2027 const union sctp_addr *, 2028 const union sctp_addr *); 2029 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 2030 int sctp_assoc_update(struct sctp_association *old, 2031 struct sctp_association *new); 2032 2033 __u32 sctp_association_get_next_tsn(struct sctp_association *); 2034 2035 void sctp_assoc_sync_pmtu(struct sctp_association *asoc); 2036 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 2037 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 2038 void sctp_assoc_set_primary(struct sctp_association *, 2039 struct sctp_transport *); 2040 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 2041 struct sctp_transport *); 2042 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, 2043 enum sctp_scope scope, gfp_t gfp); 2044 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 2045 struct sctp_cookie*, 2046 gfp_t gfp); 2047 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 2048 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 2049 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 2050 const struct sctp_association *asoc, 2051 __be32 serial); 2052 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 2053 2054 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 2055 const union sctp_addr *ss2); 2056 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2057 2058 /* A convenience structure to parse out SCTP specific CMSGs. */ 2059 struct sctp_cmsgs { 2060 struct sctp_initmsg *init; 2061 struct sctp_sndrcvinfo *srinfo; 2062 struct sctp_sndinfo *sinfo; 2063 }; 2064 2065 /* Structure for tracking memory objects */ 2066 struct sctp_dbg_objcnt_entry { 2067 char *label; 2068 atomic_t *counter; 2069 }; 2070 2071 #endif /* __sctp_structs_h__ */ 2072