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 /* What is the current MID number for this stream? */ 403 #define sctp_mid_peek(stream, type, sid) \ 404 ((stream)->type[sid].mid) 405 406 /* Return the next MID number for this stream. */ 407 #define sctp_mid_next(stream, type, sid) \ 408 ((stream)->type[sid].mid++) 409 410 /* Skip over this mid and all below. */ 411 #define sctp_mid_skip(stream, type, sid, mid) \ 412 ((stream)->type[sid].mid = mid + 1) 413 414 #define sctp_stream_in(asoc, sid) (&(asoc)->stream.in[sid]) 415 416 /* What is the current MID_uo number for this stream? */ 417 #define sctp_mid_uo_peek(stream, type, sid) \ 418 ((stream)->type[sid].mid_uo) 419 420 /* Return the next MID_uo number for this stream. */ 421 #define sctp_mid_uo_next(stream, type, sid) \ 422 ((stream)->type[sid].mid_uo++) 423 424 /* 425 * Pointers to address related SCTP functions. 426 * (i.e. things that depend on the address family.) 427 */ 428 struct sctp_af { 429 int (*sctp_xmit) (struct sk_buff *skb, 430 struct sctp_transport *); 431 int (*setsockopt) (struct sock *sk, 432 int level, 433 int optname, 434 char __user *optval, 435 unsigned int optlen); 436 int (*getsockopt) (struct sock *sk, 437 int level, 438 int optname, 439 char __user *optval, 440 int __user *optlen); 441 int (*compat_setsockopt) (struct sock *sk, 442 int level, 443 int optname, 444 char __user *optval, 445 unsigned int optlen); 446 int (*compat_getsockopt) (struct sock *sk, 447 int level, 448 int optname, 449 char __user *optval, 450 int __user *optlen); 451 void (*get_dst) (struct sctp_transport *t, 452 union sctp_addr *saddr, 453 struct flowi *fl, 454 struct sock *sk); 455 void (*get_saddr) (struct sctp_sock *sk, 456 struct sctp_transport *t, 457 struct flowi *fl); 458 void (*copy_addrlist) (struct list_head *, 459 struct net_device *); 460 int (*cmp_addr) (const union sctp_addr *addr1, 461 const union sctp_addr *addr2); 462 void (*addr_copy) (union sctp_addr *dst, 463 union sctp_addr *src); 464 void (*from_skb) (union sctp_addr *, 465 struct sk_buff *skb, 466 int saddr); 467 void (*from_sk) (union sctp_addr *, 468 struct sock *sk); 469 void (*from_addr_param) (union sctp_addr *, 470 union sctp_addr_param *, 471 __be16 port, int iif); 472 int (*to_addr_param) (const union sctp_addr *, 473 union sctp_addr_param *); 474 int (*addr_valid) (union sctp_addr *, 475 struct sctp_sock *, 476 const struct sk_buff *); 477 enum sctp_scope (*scope)(union sctp_addr *); 478 void (*inaddr_any) (union sctp_addr *, __be16); 479 int (*is_any) (const union sctp_addr *); 480 int (*available) (union sctp_addr *, 481 struct sctp_sock *); 482 int (*skb_iif) (const struct sk_buff *sk); 483 int (*is_ce) (const struct sk_buff *sk); 484 void (*seq_dump_addr)(struct seq_file *seq, 485 union sctp_addr *addr); 486 void (*ecn_capable)(struct sock *sk); 487 __u16 net_header_len; 488 int sockaddr_len; 489 sa_family_t sa_family; 490 struct list_head list; 491 }; 492 493 struct sctp_af *sctp_get_af_specific(sa_family_t); 494 int sctp_register_af(struct sctp_af *); 495 496 /* Protocol family functions. */ 497 struct sctp_pf { 498 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 499 void (*skb_msgname) (struct sk_buff *, char *, int *); 500 int (*af_supported) (sa_family_t, struct sctp_sock *); 501 int (*cmp_addr) (const union sctp_addr *, 502 const union sctp_addr *, 503 struct sctp_sock *); 504 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 505 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 506 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 507 struct sock *(*create_accept_sk) (struct sock *sk, 508 struct sctp_association *asoc, 509 bool kern); 510 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 511 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 512 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 513 struct sctp_af *af; 514 }; 515 516 517 /* Structure to track chunk fragments that have been acked, but peer 518 * fragments of the same message have not. 519 */ 520 struct sctp_datamsg { 521 /* Chunks waiting to be submitted to lower layer. */ 522 struct list_head chunks; 523 /* Reference counting. */ 524 refcount_t refcnt; 525 /* When is this message no longer interesting to the peer? */ 526 unsigned long expires_at; 527 /* Did the messenge fail to send? */ 528 int send_error; 529 u8 send_failed:1, 530 can_delay:1, /* should this message be Nagle delayed */ 531 abandoned:1; /* should this message be abandoned */ 532 }; 533 534 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 535 struct sctp_sndrcvinfo *, 536 struct iov_iter *); 537 void sctp_datamsg_free(struct sctp_datamsg *); 538 void sctp_datamsg_put(struct sctp_datamsg *); 539 void sctp_chunk_fail(struct sctp_chunk *, int error); 540 int sctp_chunk_abandoned(struct sctp_chunk *); 541 542 /* RFC2960 1.4 Key Terms 543 * 544 * o Chunk: A unit of information within an SCTP packet, consisting of 545 * a chunk header and chunk-specific content. 546 * 547 * As a matter of convenience, we remember the SCTP common header for 548 * each chunk as well as a few other header pointers... 549 */ 550 struct sctp_chunk { 551 struct list_head list; 552 553 refcount_t refcnt; 554 555 /* How many times this chunk have been sent, for prsctp RTX policy */ 556 int sent_count; 557 558 union { 559 /* This is our link to the per-transport transmitted list. */ 560 struct list_head transmitted_list; 561 /* List in specific stream outq */ 562 struct list_head stream_list; 563 }; 564 565 /* This field is used by chunks that hold fragmented data. 566 * For the first fragment this is the list that holds the rest of 567 * fragments. For the remaining fragments, this is the link to the 568 * frag_list maintained in the first fragment. 569 */ 570 struct list_head frag_list; 571 572 /* This points to the sk_buff containing the actual data. */ 573 struct sk_buff *skb; 574 575 /* In case of GSO packets, this will store the head one */ 576 struct sk_buff *head_skb; 577 578 /* These are the SCTP headers by reverse order in a packet. 579 * Note that some of these may happen more than once. In that 580 * case, we point at the "current" one, whatever that means 581 * for that level of header. 582 */ 583 584 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 585 union sctp_params param_hdr; 586 union { 587 __u8 *v; 588 struct sctp_datahdr *data_hdr; 589 struct sctp_inithdr *init_hdr; 590 struct sctp_sackhdr *sack_hdr; 591 struct sctp_heartbeathdr *hb_hdr; 592 struct sctp_sender_hb_info *hbs_hdr; 593 struct sctp_shutdownhdr *shutdown_hdr; 594 struct sctp_signed_cookie *cookie_hdr; 595 struct sctp_ecnehdr *ecne_hdr; 596 struct sctp_cwrhdr *ecn_cwr_hdr; 597 struct sctp_errhdr *err_hdr; 598 struct sctp_addiphdr *addip_hdr; 599 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 600 struct sctp_authhdr *auth_hdr; 601 struct sctp_idatahdr *idata_hdr; 602 struct sctp_ifwdtsn_hdr *ifwdtsn_hdr; 603 } subh; 604 605 __u8 *chunk_end; 606 607 struct sctp_chunkhdr *chunk_hdr; 608 struct sctphdr *sctp_hdr; 609 610 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 611 struct sctp_sndrcvinfo sinfo; 612 613 /* Which association does this belong to? */ 614 struct sctp_association *asoc; 615 616 /* What endpoint received this chunk? */ 617 struct sctp_ep_common *rcvr; 618 619 /* We fill this in if we are calculating RTT. */ 620 unsigned long sent_at; 621 622 /* What is the origin IP address for this chunk? */ 623 union sctp_addr source; 624 /* Destination address for this chunk. */ 625 union sctp_addr dest; 626 627 /* For outbound message, track all fragments for SEND_FAILED. */ 628 struct sctp_datamsg *msg; 629 630 /* For an inbound chunk, this tells us where it came from. 631 * For an outbound chunk, it tells us where we'd like it to 632 * go. It is NULL if we have no preference. 633 */ 634 struct sctp_transport *transport; 635 636 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 637 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 638 * spec violates the principle premis that all chunks are processed 639 * in order. 640 */ 641 struct sk_buff *auth_chunk; 642 643 #define SCTP_CAN_FRTX 0x0 644 #define SCTP_NEED_FRTX 0x1 645 #define SCTP_DONT_FRTX 0x2 646 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 647 has_tsn:1, /* Does this chunk have a TSN yet? */ 648 has_ssn:1, /* Does this chunk have a SSN yet? */ 649 #define has_mid has_ssn 650 singleton:1, /* Only chunk in the packet? */ 651 end_of_packet:1, /* Last chunk in the packet? */ 652 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 653 pdiscard:1, /* Discard the whole packet now? */ 654 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 655 data_accepted:1, /* At least 1 chunk accepted */ 656 auth:1, /* IN: was auth'ed | OUT: needs auth */ 657 has_asconf:1, /* IN: have seen an asconf before */ 658 tsn_missing_report:2, /* Data chunk missing counter. */ 659 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 660 }; 661 662 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 663 void sctp_chunk_hold(struct sctp_chunk *); 664 void sctp_chunk_put(struct sctp_chunk *); 665 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 666 struct iov_iter *from); 667 void sctp_chunk_free(struct sctp_chunk *); 668 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 669 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 670 const struct sctp_association *, 671 struct sock *, gfp_t gfp); 672 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 673 union sctp_addr *); 674 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 675 676 static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) 677 { 678 return ntohs(ch->subh.data_hdr->stream); 679 } 680 681 enum { 682 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 683 SCTP_ADDR_SRC, /* address can be used as source */ 684 SCTP_ADDR_DEL, /* address about to be deleted */ 685 }; 686 687 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 688 struct sctp_sockaddr_entry { 689 struct list_head list; 690 struct rcu_head rcu; 691 union sctp_addr a; 692 __u8 state; 693 __u8 valid; 694 }; 695 696 #define SCTP_ADDRESS_TICK_DELAY 500 697 698 /* This structure holds lists of chunks as we are assembling for 699 * transmission. 700 */ 701 struct sctp_packet { 702 /* These are the SCTP header values (host order) for the packet. */ 703 __u16 source_port; 704 __u16 destination_port; 705 __u32 vtag; 706 707 /* This contains the payload chunks. */ 708 struct list_head chunk_list; 709 710 /* This is the overhead of the sctp and ip headers. */ 711 size_t overhead; 712 /* This is the total size of all chunks INCLUDING padding. */ 713 size_t size; 714 /* This is the maximum size this packet may have */ 715 size_t max_size; 716 717 /* The packet is destined for this transport address. 718 * The function we finally use to pass down to the next lower 719 * layer lives in the transport structure. 720 */ 721 struct sctp_transport *transport; 722 723 /* pointer to the auth chunk for this packet */ 724 struct sctp_chunk *auth; 725 726 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 727 has_sack:1, /* This packet contains a SACK chunk. */ 728 has_auth:1, /* This packet contains an AUTH chunk */ 729 has_data:1, /* This packet contains at least 1 DATA chunk */ 730 ipfragok:1; /* So let ip fragment this packet */ 731 }; 732 733 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 734 __u16 sport, __u16 dport); 735 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 736 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, 737 struct sctp_chunk *chunk, 738 int one_packet, gfp_t gfp); 739 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, 740 struct sctp_chunk *chunk); 741 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 742 void sctp_packet_free(struct sctp_packet *); 743 744 static inline int sctp_packet_empty(struct sctp_packet *packet) 745 { 746 return packet->size == packet->overhead; 747 } 748 749 /* This represents a remote transport address. 750 * For local transport addresses, we just use union sctp_addr. 751 * 752 * RFC2960 Section 1.4 Key Terms 753 * 754 * o Transport address: A Transport Address is traditionally defined 755 * by Network Layer address, Transport Layer protocol and Transport 756 * Layer port number. In the case of SCTP running over IP, a 757 * transport address is defined by the combination of an IP address 758 * and an SCTP port number (where SCTP is the Transport protocol). 759 * 760 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 761 * 762 * o The sender keeps a separate congestion control parameter set for 763 * each of the destination addresses it can send to (not each 764 * source-destination pair but for each destination). The parameters 765 * should decay if the address is not used for a long enough time 766 * period. 767 * 768 */ 769 struct sctp_transport { 770 /* A list of transports. */ 771 struct list_head transports; 772 struct rhlist_head node; 773 774 /* Reference counting. */ 775 refcount_t refcnt; 776 /* RTO-Pending : A flag used to track if one of the DATA 777 * chunks sent to this address is currently being 778 * used to compute a RTT. If this flag is 0, 779 * the next DATA chunk sent to this destination 780 * should be used to compute a RTT and this flag 781 * should be set. Every time the RTT 782 * calculation completes (i.e. the DATA chunk 783 * is SACK'd) clear this flag. 784 */ 785 __u32 rto_pending:1, 786 787 /* 788 * hb_sent : a flag that signals that we have a pending 789 * heartbeat. 790 */ 791 hb_sent:1, 792 793 /* Is the Path MTU update pending on this tranport */ 794 pmtu_pending:1, 795 796 dst_pending_confirm:1, /* need to confirm neighbour */ 797 798 /* Has this transport moved the ctsn since we last sacked */ 799 sack_generation:1; 800 u32 dst_cookie; 801 802 struct flowi fl; 803 804 /* This is the peer's IP address and port. */ 805 union sctp_addr ipaddr; 806 807 /* These are the functions we call to handle LLP stuff. */ 808 struct sctp_af *af_specific; 809 810 /* Which association do we belong to? */ 811 struct sctp_association *asoc; 812 813 /* RFC2960 814 * 815 * 12.3 Per Transport Address Data 816 * 817 * For each destination transport address in the peer's 818 * address list derived from the INIT or INIT ACK chunk, a 819 * number of data elements needs to be maintained including: 820 */ 821 /* RTO : The current retransmission timeout value. */ 822 unsigned long rto; 823 824 __u32 rtt; /* This is the most recent RTT. */ 825 826 /* RTTVAR : The current RTT variation. */ 827 __u32 rttvar; 828 829 /* SRTT : The current smoothed round trip time. */ 830 __u32 srtt; 831 832 /* 833 * These are the congestion stats. 834 */ 835 /* cwnd : The current congestion window. */ 836 __u32 cwnd; /* This is the actual cwnd. */ 837 838 /* ssthresh : The current slow start threshold value. */ 839 __u32 ssthresh; 840 841 /* partial : The tracking method for increase of cwnd when in 842 * bytes acked : congestion avoidance mode (see Section 6.2.2) 843 */ 844 __u32 partial_bytes_acked; 845 846 /* Data that has been sent, but not acknowledged. */ 847 __u32 flight_size; 848 849 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 850 851 /* Destination */ 852 struct dst_entry *dst; 853 /* Source address. */ 854 union sctp_addr saddr; 855 856 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 857 * the destination address every heartbeat interval. 858 */ 859 unsigned long hbinterval; 860 861 /* SACK delay timeout */ 862 unsigned long sackdelay; 863 __u32 sackfreq; 864 865 /* When was the last time that we heard from this transport? We use 866 * this to pick new active and retran paths. 867 */ 868 ktime_t last_time_heard; 869 870 /* When was the last time that we sent a chunk using this 871 * transport? We use this to check for idle transports 872 */ 873 unsigned long last_time_sent; 874 875 /* Last time(in jiffies) when cwnd is reduced due to the congestion 876 * indication based on ECNE chunk. 877 */ 878 unsigned long last_time_ecne_reduced; 879 880 /* This is the max_retrans value for the transport and will 881 * be initialized from the assocs value. This can be changed 882 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 883 */ 884 __u16 pathmaxrxt; 885 886 /* This is the partially failed retrans value for the transport 887 * and will be initialized from the assocs value. This can be changed 888 * using the SCTP_PEER_ADDR_THLDS socket option 889 */ 890 int pf_retrans; 891 /* PMTU : The current known path MTU. */ 892 __u32 pathmtu; 893 894 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 895 __u32 param_flags; 896 897 /* The number of times INIT has been sent on this transport. */ 898 int init_sent_count; 899 900 /* state : The current state of this destination, 901 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 902 */ 903 int state; 904 905 /* These are the error stats for this destination. */ 906 907 /* Error count : The current error count for this destination. */ 908 unsigned short error_count; 909 910 /* Per : A timer used by each destination. 911 * Destination : 912 * Timer : 913 * 914 * [Everywhere else in the text this is called T3-rtx. -ed] 915 */ 916 struct timer_list T3_rtx_timer; 917 918 /* Heartbeat timer is per destination. */ 919 struct timer_list hb_timer; 920 921 /* Timer to handle ICMP proto unreachable envets */ 922 struct timer_list proto_unreach_timer; 923 924 /* Timer to handler reconf chunk rtx */ 925 struct timer_list reconf_timer; 926 927 /* Since we're using per-destination retransmission timers 928 * (see above), we're also using per-destination "transmitted" 929 * queues. This probably ought to be a private struct 930 * accessible only within the outqueue, but it's not, yet. 931 */ 932 struct list_head transmitted; 933 934 /* We build bundle-able packets for this transport here. */ 935 struct sctp_packet packet; 936 937 /* This is the list of transports that have chunks to send. */ 938 struct list_head send_ready; 939 940 /* State information saved for SFR_CACC algorithm. The key 941 * idea in SFR_CACC is to maintain state at the sender on a 942 * per-destination basis when a changeover happens. 943 * char changeover_active; 944 * char cycling_changeover; 945 * __u32 next_tsn_at_change; 946 * char cacc_saw_newack; 947 */ 948 struct { 949 /* An unsigned integer, which stores the next TSN to be 950 * used by the sender, at the moment of changeover. 951 */ 952 __u32 next_tsn_at_change; 953 954 /* A flag which indicates the occurrence of a changeover */ 955 char changeover_active; 956 957 /* A flag which indicates whether the change of primary is 958 * the first switch to this destination address during an 959 * active switch. 960 */ 961 char cycling_changeover; 962 963 /* A temporary flag, which is used during the processing of 964 * a SACK to estimate the causative TSN(s)'s group. 965 */ 966 char cacc_saw_newack; 967 } cacc; 968 969 /* 64-bit random number sent with heartbeat. */ 970 __u64 hb_nonce; 971 972 struct rcu_head rcu; 973 }; 974 975 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 976 gfp_t); 977 void sctp_transport_set_owner(struct sctp_transport *, 978 struct sctp_association *); 979 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 980 struct sctp_sock *); 981 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 982 void sctp_transport_free(struct sctp_transport *); 983 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 984 void sctp_transport_reset_hb_timer(struct sctp_transport *); 985 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 986 int sctp_transport_hold(struct sctp_transport *); 987 void sctp_transport_put(struct sctp_transport *); 988 void sctp_transport_update_rto(struct sctp_transport *, __u32); 989 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 990 void sctp_transport_lower_cwnd(struct sctp_transport *t, 991 enum sctp_lower_cwnd reason); 992 void sctp_transport_burst_limited(struct sctp_transport *); 993 void sctp_transport_burst_reset(struct sctp_transport *); 994 unsigned long sctp_transport_timeout(struct sctp_transport *); 995 void sctp_transport_reset(struct sctp_transport *t); 996 void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); 997 void sctp_transport_immediate_rtx(struct sctp_transport *); 998 void sctp_transport_dst_release(struct sctp_transport *t); 999 void sctp_transport_dst_confirm(struct sctp_transport *t); 1000 1001 1002 /* This is the structure we use to queue packets as they come into 1003 * SCTP. We write packets to it and read chunks from it. 1004 */ 1005 struct sctp_inq { 1006 /* This is actually a queue of sctp_chunk each 1007 * containing a partially decoded packet. 1008 */ 1009 struct list_head in_chunk_list; 1010 /* This is the packet which is currently off the in queue and is 1011 * being worked on through the inbound chunk processing. 1012 */ 1013 struct sctp_chunk *in_progress; 1014 1015 /* This is the delayed task to finish delivering inbound 1016 * messages. 1017 */ 1018 struct work_struct immediate; 1019 }; 1020 1021 void sctp_inq_init(struct sctp_inq *); 1022 void sctp_inq_free(struct sctp_inq *); 1023 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1024 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1025 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1026 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1027 1028 /* This is the structure we use to hold outbound chunks. You push 1029 * chunks in and they automatically pop out the other end as bundled 1030 * packets (it calls (*output_handler)()). 1031 * 1032 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1033 * and 8.2 of the v13 draft. 1034 * 1035 * It handles retransmissions. The connection to the timeout portion 1036 * of the state machine is through sctp_..._timeout() and timeout_handler. 1037 * 1038 * If you feed it SACKs, it will eat them. 1039 * 1040 * If you give it big chunks, it will fragment them. 1041 * 1042 * It assigns TSN's to data chunks. This happens at the last possible 1043 * instant before transmission. 1044 * 1045 * When free()'d, it empties itself out via output_handler(). 1046 */ 1047 struct sctp_outq { 1048 struct sctp_association *asoc; 1049 1050 /* Data pending that has never been transmitted. */ 1051 struct list_head out_chunk_list; 1052 1053 /* Stream scheduler being used */ 1054 struct sctp_sched_ops *sched; 1055 1056 unsigned int out_qlen; /* Total length of queued data chunks. */ 1057 1058 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1059 unsigned int error; 1060 1061 /* These are control chunks we want to send. */ 1062 struct list_head control_chunk_list; 1063 1064 /* These are chunks that have been sacked but are above the 1065 * CTSN, or cumulative tsn ack point. 1066 */ 1067 struct list_head sacked; 1068 1069 /* Put chunks on this list to schedule them for 1070 * retransmission. 1071 */ 1072 struct list_head retransmit; 1073 1074 /* Put chunks on this list to save them for FWD TSN processing as 1075 * they were abandoned. 1076 */ 1077 struct list_head abandoned; 1078 1079 /* How many unackd bytes do we have in-flight? */ 1080 __u32 outstanding_bytes; 1081 1082 /* Are we doing fast-rtx on this queue */ 1083 char fast_rtx; 1084 1085 /* Corked? */ 1086 char cork; 1087 }; 1088 1089 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1090 void sctp_outq_teardown(struct sctp_outq *); 1091 void sctp_outq_free(struct sctp_outq*); 1092 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1093 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1094 int sctp_outq_is_empty(const struct sctp_outq *); 1095 void sctp_outq_restart(struct sctp_outq *); 1096 1097 void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, 1098 enum sctp_retransmit_reason reason); 1099 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1100 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1101 void sctp_prsctp_prune(struct sctp_association *asoc, 1102 struct sctp_sndrcvinfo *sinfo, int msg_len); 1103 /* Uncork and flush an outqueue. */ 1104 static inline void sctp_outq_cork(struct sctp_outq *q) 1105 { 1106 q->cork = 1; 1107 } 1108 1109 /* SCTP skb control block. 1110 * sctp_input_cb is currently used on rx and sock rx queue 1111 */ 1112 struct sctp_input_cb { 1113 union { 1114 struct inet_skb_parm h4; 1115 #if IS_ENABLED(CONFIG_IPV6) 1116 struct inet6_skb_parm h6; 1117 #endif 1118 } header; 1119 struct sctp_chunk *chunk; 1120 struct sctp_af *af; 1121 }; 1122 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1123 1124 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1125 { 1126 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1127 1128 return chunk->head_skb ? : skb; 1129 } 1130 1131 /* These bind address data fields common between endpoints and associations */ 1132 struct sctp_bind_addr { 1133 1134 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1135 * 1136 * SCTP Port: The local SCTP port number the endpoint is 1137 * bound to. 1138 */ 1139 __u16 port; 1140 1141 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1142 * 1143 * Address List: The list of IP addresses that this instance 1144 * has bound. This information is passed to one's 1145 * peer(s) in INIT and INIT ACK chunks. 1146 */ 1147 struct list_head address_list; 1148 }; 1149 1150 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1151 void sctp_bind_addr_free(struct sctp_bind_addr *); 1152 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1153 const struct sctp_bind_addr *src, 1154 enum sctp_scope scope, gfp_t gfp, 1155 int flags); 1156 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1157 const struct sctp_bind_addr *src, 1158 gfp_t gfp); 1159 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1160 int new_size, __u8 addr_state, gfp_t gfp); 1161 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1162 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1163 struct sctp_sock *); 1164 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1165 struct sctp_sock *, struct sctp_sock *); 1166 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1167 const union sctp_addr *addr); 1168 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1169 const union sctp_addr *addrs, 1170 int addrcnt, 1171 struct sctp_sock *opt); 1172 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1173 int *addrs_len, 1174 gfp_t gfp); 1175 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1176 __u16 port, gfp_t gfp); 1177 1178 enum sctp_scope sctp_scope(const union sctp_addr *addr); 1179 int sctp_in_scope(struct net *net, const union sctp_addr *addr, 1180 const enum sctp_scope scope); 1181 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1182 int sctp_is_ep_boundall(struct sock *sk); 1183 1184 1185 /* What type of endpoint? */ 1186 enum sctp_endpoint_type { 1187 SCTP_EP_TYPE_SOCKET, 1188 SCTP_EP_TYPE_ASSOCIATION, 1189 }; 1190 1191 /* 1192 * A common base class to bridge the implmentation view of a 1193 * socket (usually listening) endpoint versus an association's 1194 * local endpoint. 1195 * This common structure is useful for several purposes: 1196 * 1) Common interface for lookup routines. 1197 * a) Subfunctions work for either endpoint or association 1198 * b) Single interface to lookup allows hiding the lookup lock rather 1199 * than acquiring it externally. 1200 * 2) Common interface for the inbound chunk handling/state machine. 1201 * 3) Common object handling routines for reference counting, etc. 1202 * 4) Disentangle association lookup from endpoint lookup, where we 1203 * do not have to find our endpoint to find our association. 1204 * 1205 */ 1206 1207 struct sctp_ep_common { 1208 /* Fields to help us manage our entries in the hash tables. */ 1209 struct hlist_node node; 1210 int hashent; 1211 1212 /* Runtime type information. What kind of endpoint is this? */ 1213 enum sctp_endpoint_type type; 1214 1215 /* Some fields to help us manage this object. 1216 * refcnt - Reference count access to this object. 1217 * dead - Do not attempt to use this object. 1218 */ 1219 refcount_t refcnt; 1220 bool dead; 1221 1222 /* What socket does this endpoint belong to? */ 1223 struct sock *sk; 1224 1225 /* This is where we receive inbound chunks. */ 1226 struct sctp_inq inqueue; 1227 1228 /* This substructure includes the defining parameters of the 1229 * endpoint: 1230 * bind_addr.port is our shared port number. 1231 * bind_addr.address_list is our set of local IP addresses. 1232 */ 1233 struct sctp_bind_addr bind_addr; 1234 }; 1235 1236 1237 /* RFC Section 1.4 Key Terms 1238 * 1239 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1240 * multi-homed host, an SCTP endpoint is represented to its peers as a 1241 * combination of a set of eligible destination transport addresses to 1242 * which SCTP packets can be sent and a set of eligible source 1243 * transport addresses from which SCTP packets can be received. 1244 * All transport addresses used by an SCTP endpoint must use the 1245 * same port number, but can use multiple IP addresses. A transport 1246 * address used by an SCTP endpoint must not be used by another 1247 * SCTP endpoint. In other words, a transport address is unique 1248 * to an SCTP endpoint. 1249 * 1250 * From an implementation perspective, each socket has one of these. 1251 * A TCP-style socket will have exactly one association on one of 1252 * these. An UDP-style socket will have multiple associations hanging 1253 * off one of these. 1254 */ 1255 1256 struct sctp_endpoint { 1257 /* Common substructure for endpoint and association. */ 1258 struct sctp_ep_common base; 1259 1260 /* Associations: A list of current associations and mappings 1261 * to the data consumers for each association. This 1262 * may be in the form of a hash table or other 1263 * implementation dependent structure. The data 1264 * consumers may be process identification 1265 * information such as file descriptors, named pipe 1266 * pointer, or table pointers dependent on how SCTP 1267 * is implemented. 1268 */ 1269 /* This is really a list of struct sctp_association entries. */ 1270 struct list_head asocs; 1271 1272 /* Secret Key: A secret key used by this endpoint to compute 1273 * the MAC. This SHOULD be a cryptographic quality 1274 * random number with a sufficient length. 1275 * Discussion in [RFC1750] can be helpful in 1276 * selection of the key. 1277 */ 1278 __u8 secret_key[SCTP_SECRET_SIZE]; 1279 1280 /* digest: This is a digest of the sctp cookie. This field is 1281 * only used on the receive path when we try to validate 1282 * that the cookie has not been tampered with. We put 1283 * this here so we pre-allocate this once and can re-use 1284 * on every receive. 1285 */ 1286 __u8 *digest; 1287 1288 /* sendbuf acct. policy. */ 1289 __u32 sndbuf_policy; 1290 1291 /* rcvbuf acct. policy. */ 1292 __u32 rcvbuf_policy; 1293 1294 /* SCTP AUTH: array of the HMACs that will be allocated 1295 * we need this per association so that we don't serialize 1296 */ 1297 struct crypto_shash **auth_hmacs; 1298 1299 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1300 struct sctp_hmac_algo_param *auth_hmacs_list; 1301 1302 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1303 struct sctp_chunks_param *auth_chunk_list; 1304 1305 /* SCTP-AUTH: endpoint shared keys */ 1306 struct list_head endpoint_shared_keys; 1307 __u16 active_key_id; 1308 __u8 auth_enable:1, 1309 prsctp_enable:1, 1310 reconf_enable:1; 1311 1312 __u8 strreset_enable; 1313 }; 1314 1315 /* Recover the outter endpoint structure. */ 1316 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1317 { 1318 struct sctp_endpoint *ep; 1319 1320 ep = container_of(base, struct sctp_endpoint, base); 1321 return ep; 1322 } 1323 1324 /* These are function signatures for manipulating endpoints. */ 1325 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1326 void sctp_endpoint_free(struct sctp_endpoint *); 1327 void sctp_endpoint_put(struct sctp_endpoint *); 1328 void sctp_endpoint_hold(struct sctp_endpoint *); 1329 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1330 struct sctp_association *sctp_endpoint_lookup_assoc( 1331 const struct sctp_endpoint *ep, 1332 const union sctp_addr *paddr, 1333 struct sctp_transport **); 1334 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1335 const union sctp_addr *); 1336 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1337 struct net *, const union sctp_addr *); 1338 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1339 const union sctp_addr *paddr); 1340 1341 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1342 const struct sctp_association *asoc, 1343 enum sctp_cid cid, struct sctp_init_chunk *peer_init, 1344 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1345 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1346 const union sctp_addr *peer, 1347 struct sctp_init_chunk *init, gfp_t gfp); 1348 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1349 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1350 1351 struct sctp_inithdr_host { 1352 __u32 init_tag; 1353 __u32 a_rwnd; 1354 __u16 num_outbound_streams; 1355 __u16 num_inbound_streams; 1356 __u32 initial_tsn; 1357 }; 1358 1359 struct sctp_stream_priorities { 1360 /* List of priorities scheduled */ 1361 struct list_head prio_sched; 1362 /* List of streams scheduled */ 1363 struct list_head active; 1364 /* The next stream stream in line */ 1365 struct sctp_stream_out_ext *next; 1366 __u16 prio; 1367 }; 1368 1369 struct sctp_stream_out_ext { 1370 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1371 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1372 struct list_head outq; /* chunks enqueued by this stream */ 1373 union { 1374 struct { 1375 /* Scheduled streams list */ 1376 struct list_head prio_list; 1377 struct sctp_stream_priorities *prio_head; 1378 }; 1379 /* Fields used by RR scheduler */ 1380 struct { 1381 struct list_head rr_list; 1382 }; 1383 }; 1384 }; 1385 1386 struct sctp_stream_out { 1387 union { 1388 __u32 mid; 1389 __u16 ssn; 1390 }; 1391 __u32 mid_uo; 1392 struct sctp_stream_out_ext *ext; 1393 __u8 state; 1394 }; 1395 1396 struct sctp_stream_in { 1397 union { 1398 __u32 mid; 1399 __u16 ssn; 1400 }; 1401 __u32 mid_uo; 1402 __u32 fsn; 1403 __u32 fsn_uo; 1404 char pd_mode; 1405 char pd_mode_uo; 1406 }; 1407 1408 struct sctp_stream { 1409 struct sctp_stream_out *out; 1410 struct sctp_stream_in *in; 1411 __u16 outcnt; 1412 __u16 incnt; 1413 /* Current stream being sent, if any */ 1414 struct sctp_stream_out *out_curr; 1415 union { 1416 /* Fields used by priority scheduler */ 1417 struct { 1418 /* List of priorities scheduled */ 1419 struct list_head prio_list; 1420 }; 1421 /* Fields used by RR scheduler */ 1422 struct { 1423 /* List of streams scheduled */ 1424 struct list_head rr_list; 1425 /* The next stream stream in line */ 1426 struct sctp_stream_out_ext *rr_next; 1427 }; 1428 }; 1429 struct sctp_stream_interleave *si; 1430 }; 1431 1432 #define SCTP_STREAM_CLOSED 0x00 1433 #define SCTP_STREAM_OPEN 0x01 1434 1435 static inline __u16 sctp_datachk_len(const struct sctp_stream *stream) 1436 { 1437 return stream->si->data_chunk_len; 1438 } 1439 1440 static inline __u16 sctp_datahdr_len(const struct sctp_stream *stream) 1441 { 1442 return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr); 1443 } 1444 1445 /* SCTP_GET_ASSOC_STATS counters */ 1446 struct sctp_priv_assoc_stats { 1447 /* Maximum observed rto in the association during subsequent 1448 * observations. Value is set to 0 if no RTO measurement took place 1449 * The transport where the max_rto was observed is returned in 1450 * obs_rto_ipaddr 1451 */ 1452 struct sockaddr_storage obs_rto_ipaddr; 1453 __u64 max_obs_rto; 1454 /* Total In and Out SACKs received and sent */ 1455 __u64 isacks; 1456 __u64 osacks; 1457 /* Total In and Out packets received and sent */ 1458 __u64 opackets; 1459 __u64 ipackets; 1460 /* Total retransmitted chunks */ 1461 __u64 rtxchunks; 1462 /* TSN received > next expected */ 1463 __u64 outofseqtsns; 1464 /* Duplicate Chunks received */ 1465 __u64 idupchunks; 1466 /* Gap Ack Blocks received */ 1467 __u64 gapcnt; 1468 /* Unordered data chunks sent and received */ 1469 __u64 ouodchunks; 1470 __u64 iuodchunks; 1471 /* Ordered data chunks sent and received */ 1472 __u64 oodchunks; 1473 __u64 iodchunks; 1474 /* Control chunks sent and received */ 1475 __u64 octrlchunks; 1476 __u64 ictrlchunks; 1477 }; 1478 1479 /* RFC2960 1480 * 1481 * 12. Recommended Transmission Control Block (TCB) Parameters 1482 * 1483 * This section details a recommended set of parameters that should 1484 * be contained within the TCB for an implementation. This section is 1485 * for illustrative purposes and should not be deemed as requirements 1486 * on an implementation or as an exhaustive list of all parameters 1487 * inside an SCTP TCB. Each implementation may need its own additional 1488 * parameters for optimization. 1489 */ 1490 1491 1492 /* Here we have information about each individual association. */ 1493 struct sctp_association { 1494 1495 /* A base structure common to endpoint and association. 1496 * In this context, it represents the associations's view 1497 * of the local endpoint of the association. 1498 */ 1499 struct sctp_ep_common base; 1500 1501 /* Associations on the same socket. */ 1502 struct list_head asocs; 1503 1504 /* association id. */ 1505 sctp_assoc_t assoc_id; 1506 1507 /* This is our parent endpoint. */ 1508 struct sctp_endpoint *ep; 1509 1510 /* These are those association elements needed in the cookie. */ 1511 struct sctp_cookie c; 1512 1513 /* This is all information about our peer. */ 1514 struct { 1515 /* transport_addr_list 1516 * 1517 * Peer : A list of SCTP transport addresses that the 1518 * Transport : peer is bound to. This information is derived 1519 * Address : from the INIT or INIT ACK and is used to 1520 * List : associate an inbound packet with a given 1521 * : association. Normally this information is 1522 * : hashed or keyed for quick lookup and access 1523 * : of the TCB. 1524 * : The list is also initialized with the list 1525 * : of addresses passed with the sctp_connectx() 1526 * : call. 1527 * 1528 * It is a list of SCTP_transport's. 1529 */ 1530 struct list_head transport_addr_list; 1531 1532 /* rwnd 1533 * 1534 * Peer Rwnd : Current calculated value of the peer's rwnd. 1535 */ 1536 __u32 rwnd; 1537 1538 /* transport_count 1539 * 1540 * Peer : A count of the number of peer addresses 1541 * Transport : in the Peer Transport Address List. 1542 * Address : 1543 * Count : 1544 */ 1545 __u16 transport_count; 1546 1547 /* port 1548 * The transport layer port number. 1549 */ 1550 __u16 port; 1551 1552 /* primary_path 1553 * 1554 * Primary : This is the current primary destination 1555 * Path : transport address of the peer endpoint. It 1556 * : may also specify a source transport address 1557 * : on this endpoint. 1558 * 1559 * All of these paths live on transport_addr_list. 1560 * 1561 * At the bakeoffs, we discovered that the intent of 1562 * primaryPath is that it only changes when the ULP 1563 * asks to have it changed. We add the activePath to 1564 * designate the connection we are currently using to 1565 * transmit new data and most control chunks. 1566 */ 1567 struct sctp_transport *primary_path; 1568 1569 /* Cache the primary path address here, when we 1570 * need a an address for msg_name. 1571 */ 1572 union sctp_addr primary_addr; 1573 1574 /* active_path 1575 * The path that we are currently using to 1576 * transmit new data and most control chunks. 1577 */ 1578 struct sctp_transport *active_path; 1579 1580 /* retran_path 1581 * 1582 * RFC2960 6.4 Multi-homed SCTP Endpoints 1583 * ... 1584 * Furthermore, when its peer is multi-homed, an 1585 * endpoint SHOULD try to retransmit a chunk to an 1586 * active destination transport address that is 1587 * different from the last destination address to 1588 * which the DATA chunk was sent. 1589 */ 1590 struct sctp_transport *retran_path; 1591 1592 /* Pointer to last transport I have sent on. */ 1593 struct sctp_transport *last_sent_to; 1594 1595 /* This is the last transport I have received DATA on. */ 1596 struct sctp_transport *last_data_from; 1597 1598 /* 1599 * Mapping An array of bits or bytes indicating which out of 1600 * Array order TSN's have been received (relative to the 1601 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1602 * order packets have been received, this array 1603 * will be set to all zero. This structure may be 1604 * in the form of a circular buffer or bit array. 1605 * 1606 * Last Rcvd : This is the last TSN received in 1607 * TSN : sequence. This value is set initially by 1608 * : taking the peer's Initial TSN, received in 1609 * : the INIT or INIT ACK chunk, and subtracting 1610 * : one from it. 1611 * 1612 * Throughout most of the specification this is called the 1613 * "Cumulative TSN ACK Point". In this case, we 1614 * ignore the advice in 12.2 in favour of the term 1615 * used in the bulk of the text. This value is hidden 1616 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1617 */ 1618 struct sctp_tsnmap tsn_map; 1619 1620 /* This mask is used to disable sending the ASCONF chunk 1621 * with specified parameter to peer. 1622 */ 1623 __be16 addip_disabled_mask; 1624 1625 /* These are capabilities which our peer advertised. */ 1626 __u8 ecn_capable:1, /* Can peer do ECN? */ 1627 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1628 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1629 hostname_address:1, /* Peer understands DNS addresses? */ 1630 asconf_capable:1, /* Does peer support ADDIP? */ 1631 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1632 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1633 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1634 1635 /* sack_needed : This flag indicates if the next received 1636 * : packet is to be responded to with a 1637 * : SACK. This is initialized to 0. When a packet 1638 * : is received sack_cnt is incremented. If this value 1639 * : reaches 2 or more, a SACK is sent and the 1640 * : value is reset to 0. Note: This is used only 1641 * : when no DATA chunks are received out of 1642 * : order. When DATA chunks are out of order, 1643 * : SACK's are not delayed (see Section 6). 1644 */ 1645 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1646 sack_generation:1, 1647 zero_window_announced:1; 1648 __u32 sack_cnt; 1649 1650 __u32 adaptation_ind; /* Adaptation Code point. */ 1651 1652 struct sctp_inithdr_host i; 1653 void *cookie; 1654 int cookie_len; 1655 1656 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1657 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1658 * Initial TSN Value minus 1 1659 */ 1660 __u32 addip_serial; 1661 1662 /* SCTP-AUTH: We need to know pears random number, hmac list 1663 * and authenticated chunk list. All that is part of the 1664 * cookie and these are just pointers to those locations 1665 */ 1666 struct sctp_random_param *peer_random; 1667 struct sctp_chunks_param *peer_chunks; 1668 struct sctp_hmac_algo_param *peer_hmacs; 1669 } peer; 1670 1671 /* State : A state variable indicating what state the 1672 * : association is in, i.e. COOKIE-WAIT, 1673 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1674 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1675 * 1676 * Note: No "CLOSED" state is illustrated since if a 1677 * association is "CLOSED" its TCB SHOULD be removed. 1678 * 1679 * In this implementation we DO have a CLOSED 1680 * state which is used during initiation and shutdown. 1681 * 1682 * State takes values from SCTP_STATE_*. 1683 */ 1684 enum sctp_state state; 1685 1686 /* Overall : The overall association error count. 1687 * Error Count : [Clear this any time I get something.] 1688 */ 1689 int overall_error_count; 1690 1691 /* The cookie life I award for any cookie. */ 1692 ktime_t cookie_life; 1693 1694 /* These are the association's initial, max, and min RTO values. 1695 * These values will be initialized by system defaults, but can 1696 * be modified via the SCTP_RTOINFO socket option. 1697 */ 1698 unsigned long rto_initial; 1699 unsigned long rto_max; 1700 unsigned long rto_min; 1701 1702 /* Maximum number of new data packets that can be sent in a burst. */ 1703 int max_burst; 1704 1705 /* This is the max_retrans value for the association. This value will 1706 * be initialized initialized from system defaults, but can be 1707 * modified by the SCTP_ASSOCINFO socket option. 1708 */ 1709 int max_retrans; 1710 1711 /* This is the partially failed retrans value for the transport 1712 * and will be initialized from the assocs value. This can be 1713 * changed using the SCTP_PEER_ADDR_THLDS socket option 1714 */ 1715 int pf_retrans; 1716 1717 /* Maximum number of times the endpoint will retransmit INIT */ 1718 __u16 max_init_attempts; 1719 1720 /* How many times have we resent an INIT? */ 1721 __u16 init_retries; 1722 1723 /* The largest timeout or RTO value to use in attempting an INIT */ 1724 unsigned long max_init_timeo; 1725 1726 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1727 * the destination address every heartbeat interval. This value 1728 * will be inherited by all new transports. 1729 */ 1730 unsigned long hbinterval; 1731 1732 /* This is the max_retrans value for new transports in the 1733 * association. 1734 */ 1735 __u16 pathmaxrxt; 1736 1737 /* Flag that path mtu update is pending */ 1738 __u8 pmtu_pending; 1739 1740 /* Association : The smallest PMTU discovered for all of the 1741 * PMTU : peer's transport addresses. 1742 */ 1743 __u32 pathmtu; 1744 1745 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1746 __u32 param_flags; 1747 1748 __u32 sackfreq; 1749 /* SACK delay timeout */ 1750 unsigned long sackdelay; 1751 1752 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1753 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1754 1755 /* Transport to which SHUTDOWN chunk was last sent. */ 1756 struct sctp_transport *shutdown_last_sent_to; 1757 1758 /* Transport to which INIT chunk was last sent. */ 1759 struct sctp_transport *init_last_sent_to; 1760 1761 /* How many times have we resent a SHUTDOWN */ 1762 int shutdown_retries; 1763 1764 /* Next TSN : The next TSN number to be assigned to a new 1765 * : DATA chunk. This is sent in the INIT or INIT 1766 * : ACK chunk to the peer and incremented each 1767 * : time a DATA chunk is assigned a TSN 1768 * : (normally just prior to transmit or during 1769 * : fragmentation). 1770 */ 1771 __u32 next_tsn; 1772 1773 /* 1774 * Last Rcvd : This is the last TSN received in sequence. This value 1775 * TSN : is set initially by taking the peer's Initial TSN, 1776 * : received in the INIT or INIT ACK chunk, and 1777 * : subtracting one from it. 1778 * 1779 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1780 */ 1781 1782 __u32 ctsn_ack_point; 1783 1784 /* PR-SCTP Advanced.Peer.Ack.Point */ 1785 __u32 adv_peer_ack_point; 1786 1787 /* Highest TSN that is acknowledged by incoming SACKs. */ 1788 __u32 highest_sacked; 1789 1790 /* TSN marking the fast recovery exit point */ 1791 __u32 fast_recovery_exit; 1792 1793 /* Flag to track the current fast recovery state */ 1794 __u8 fast_recovery; 1795 1796 /* The number of unacknowledged data chunks. Reported through 1797 * the SCTP_STATUS sockopt. 1798 */ 1799 __u16 unack_data; 1800 1801 /* The total number of data chunks that we've had to retransmit 1802 * as the result of a T3 timer expiration 1803 */ 1804 __u32 rtx_data_chunks; 1805 1806 /* This is the association's receive buffer space. This value is used 1807 * to set a_rwnd field in an INIT or a SACK chunk. 1808 */ 1809 __u32 rwnd; 1810 1811 /* This is the last advertised value of rwnd over a SACK chunk. */ 1812 __u32 a_rwnd; 1813 1814 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1815 * to slop over a maximum of the association's frag_point. 1816 */ 1817 __u32 rwnd_over; 1818 1819 /* Keeps treack of rwnd pressure. This happens when we have 1820 * a window, but not recevie buffer (i.e small packets). This one 1821 * is releases slowly (1 PMTU at a time ). 1822 */ 1823 __u32 rwnd_press; 1824 1825 /* This is the sndbuf size in use for the association. 1826 * This corresponds to the sndbuf size for the association, 1827 * as specified in the sk->sndbuf. 1828 */ 1829 int sndbuf_used; 1830 1831 /* This is the amount of memory that this association has allocated 1832 * in the receive path at any given time. 1833 */ 1834 atomic_t rmem_alloc; 1835 1836 /* This is the wait queue head for send requests waiting on 1837 * the association sndbuf space. 1838 */ 1839 wait_queue_head_t wait; 1840 1841 /* The message size at which SCTP fragmentation will occur. */ 1842 __u32 frag_point; 1843 __u32 user_frag; 1844 1845 /* Counter used to count INIT errors. */ 1846 int init_err_counter; 1847 1848 /* Count the number of INIT cycles (for doubling timeout). */ 1849 int init_cycle; 1850 1851 /* Default send parameters. */ 1852 __u16 default_stream; 1853 __u16 default_flags; 1854 __u32 default_ppid; 1855 __u32 default_context; 1856 __u32 default_timetolive; 1857 1858 /* Default receive parameters */ 1859 __u32 default_rcv_context; 1860 1861 /* Stream arrays */ 1862 struct sctp_stream stream; 1863 1864 /* All outbound chunks go through this structure. */ 1865 struct sctp_outq outqueue; 1866 1867 /* A smart pipe that will handle reordering and fragmentation, 1868 * as well as handle passing events up to the ULP. 1869 */ 1870 struct sctp_ulpq ulpq; 1871 1872 /* Last TSN that caused an ECNE Chunk to be sent. */ 1873 __u32 last_ecne_tsn; 1874 1875 /* Last TSN that caused a CWR Chunk to be sent. */ 1876 __u32 last_cwr_tsn; 1877 1878 /* How many duplicated TSNs have we seen? */ 1879 int numduptsns; 1880 1881 /* These are to support 1882 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1883 * and Enforcement of Flow and Message Limits" 1884 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1885 * or "ADDIP" for short. 1886 */ 1887 1888 1889 1890 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1891 * 1892 * R1) One and only one ASCONF Chunk MAY be in transit and 1893 * unacknowledged at any one time. If a sender, after sending 1894 * an ASCONF chunk, decides it needs to transfer another 1895 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1896 * returns from the previous ASCONF Chunk before sending a 1897 * subsequent ASCONF. Note this restriction binds each side, 1898 * so at any time two ASCONF may be in-transit on any given 1899 * association (one sent from each endpoint). 1900 * 1901 * [This is our one-and-only-one ASCONF in flight. If we do 1902 * not have an ASCONF in flight, this is NULL.] 1903 */ 1904 struct sctp_chunk *addip_last_asconf; 1905 1906 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1907 * 1908 * This is needed to implement itmes E1 - E4 of the updated 1909 * spec. Here is the justification: 1910 * 1911 * Since the peer may bundle multiple ASCONF chunks toward us, 1912 * we now need the ability to cache multiple ACKs. The section 1913 * describes in detail how they are cached and cleaned up. 1914 */ 1915 struct list_head asconf_ack_list; 1916 1917 /* These ASCONF chunks are waiting to be sent. 1918 * 1919 * These chunaks can't be pushed to outqueue until receiving 1920 * ASCONF_ACK for the previous ASCONF indicated by 1921 * addip_last_asconf, so as to guarantee that only one ASCONF 1922 * is in flight at any time. 1923 * 1924 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1925 * 1926 * In defining the ASCONF Chunk transfer procedures, it is 1927 * essential that these transfers MUST NOT cause congestion 1928 * within the network. To achieve this, we place these 1929 * restrictions on the transfer of ASCONF Chunks: 1930 * 1931 * R1) One and only one ASCONF Chunk MAY be in transit and 1932 * unacknowledged at any one time. If a sender, after sending 1933 * an ASCONF chunk, decides it needs to transfer another 1934 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1935 * returns from the previous ASCONF Chunk before sending a 1936 * subsequent ASCONF. Note this restriction binds each side, 1937 * so at any time two ASCONF may be in-transit on any given 1938 * association (one sent from each endpoint). 1939 * 1940 * 1941 * [I really think this is EXACTLY the sort of intelligence 1942 * which already resides in sctp_outq. Please move this 1943 * queue and its supporting logic down there. --piggy] 1944 */ 1945 struct list_head addip_chunk_list; 1946 1947 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1948 * 1949 * A2) A serial number should be assigned to the Chunk. The 1950 * serial number SHOULD be a monotonically increasing 1951 * number. The serial number SHOULD be initialized at 1952 * the start of the association to the same value as the 1953 * Initial TSN and every time a new ASCONF chunk is created 1954 * it is incremented by one after assigning the serial number 1955 * to the newly created chunk. 1956 * 1957 * ADDIP 1958 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1959 * 1960 * Serial Number : 32 bits (unsigned integer) 1961 * 1962 * This value represents a Serial Number for the ASCONF 1963 * Chunk. The valid range of Serial Number is from 0 to 1964 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1965 * after reaching 4294967295. 1966 */ 1967 __u32 addip_serial; 1968 int src_out_of_asoc_ok; 1969 union sctp_addr *asconf_addr_del_pending; 1970 struct sctp_transport *new_transport; 1971 1972 /* SCTP AUTH: list of the endpoint shared keys. These 1973 * keys are provided out of band by the user applicaton 1974 * and can't change during the lifetime of the association 1975 */ 1976 struct list_head endpoint_shared_keys; 1977 1978 /* SCTP AUTH: 1979 * The current generated assocaition shared key (secret) 1980 */ 1981 struct sctp_auth_bytes *asoc_shared_key; 1982 1983 /* SCTP AUTH: hmac id of the first peer requested algorithm 1984 * that we support. 1985 */ 1986 __u16 default_hmac_id; 1987 1988 __u16 active_key_id; 1989 1990 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1991 temp:1, /* Is it a temporary association? */ 1992 force_delay:1, 1993 intl_enable:1, 1994 prsctp_enable:1, 1995 reconf_enable:1; 1996 1997 __u8 strreset_enable; 1998 __u8 strreset_outstanding; /* request param count on the fly */ 1999 2000 __u32 strreset_outseq; /* Update after receiving response */ 2001 __u32 strreset_inseq; /* Update after receiving request */ 2002 __u32 strreset_result[2]; /* save the results of last 2 responses */ 2003 2004 struct sctp_chunk *strreset_chunk; /* save request chunk */ 2005 2006 struct sctp_priv_assoc_stats stats; 2007 2008 int sent_cnt_removable; 2009 2010 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 2011 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 2012 }; 2013 2014 2015 /* An eyecatcher for determining if we are really looking at an 2016 * association data structure. 2017 */ 2018 enum { 2019 SCTP_ASSOC_EYECATCHER = 0xa550c123, 2020 }; 2021 2022 /* Recover the outter association structure. */ 2023 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 2024 { 2025 struct sctp_association *asoc; 2026 2027 asoc = container_of(base, struct sctp_association, base); 2028 return asoc; 2029 } 2030 2031 /* These are function signatures for manipulating associations. */ 2032 2033 2034 struct sctp_association * 2035 sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, 2036 enum sctp_scope scope, gfp_t gfp); 2037 void sctp_association_free(struct sctp_association *); 2038 void sctp_association_put(struct sctp_association *); 2039 void sctp_association_hold(struct sctp_association *); 2040 2041 struct sctp_transport *sctp_assoc_choose_alter_transport( 2042 struct sctp_association *, struct sctp_transport *); 2043 void sctp_assoc_update_retran_path(struct sctp_association *); 2044 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 2045 const union sctp_addr *); 2046 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 2047 const union sctp_addr *laddr); 2048 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 2049 const union sctp_addr *address, 2050 const gfp_t gfp, 2051 const int peer_state); 2052 void sctp_assoc_del_peer(struct sctp_association *asoc, 2053 const union sctp_addr *addr); 2054 void sctp_assoc_rm_peer(struct sctp_association *asoc, 2055 struct sctp_transport *peer); 2056 void sctp_assoc_control_transport(struct sctp_association *asoc, 2057 struct sctp_transport *transport, 2058 enum sctp_transport_cmd command, 2059 sctp_sn_error_t error); 2060 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 2061 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 2062 struct net *, 2063 const union sctp_addr *, 2064 const union sctp_addr *); 2065 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 2066 int sctp_assoc_update(struct sctp_association *old, 2067 struct sctp_association *new); 2068 2069 __u32 sctp_association_get_next_tsn(struct sctp_association *); 2070 2071 void sctp_assoc_sync_pmtu(struct sctp_association *asoc); 2072 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 2073 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 2074 void sctp_assoc_set_primary(struct sctp_association *, 2075 struct sctp_transport *); 2076 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 2077 struct sctp_transport *); 2078 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, 2079 enum sctp_scope scope, gfp_t gfp); 2080 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 2081 struct sctp_cookie*, 2082 gfp_t gfp); 2083 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 2084 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 2085 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 2086 const struct sctp_association *asoc, 2087 __be32 serial); 2088 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 2089 2090 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 2091 const union sctp_addr *ss2); 2092 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2093 2094 /* A convenience structure to parse out SCTP specific CMSGs. */ 2095 struct sctp_cmsgs { 2096 struct sctp_initmsg *init; 2097 struct sctp_sndrcvinfo *srinfo; 2098 struct sctp_sndinfo *sinfo; 2099 }; 2100 2101 /* Structure for tracking memory objects */ 2102 struct sctp_dbg_objcnt_entry { 2103 char *label; 2104 atomic_t *counter; 2105 }; 2106 2107 #endif /* __sctp_structs_h__ */ 2108