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_rtoinfo rtoinfo; 207 struct sctp_paddrparams paddrparam; 208 struct sctp_assocparams assocparams; 209 210 /* 211 * These two structures must be grouped together for the usercopy 212 * whitelist region. 213 */ 214 struct sctp_event_subscribe subscribe; 215 struct sctp_initmsg initmsg; 216 217 int user_frag; 218 219 __u32 autoclose; 220 __u32 adaptation_ind; 221 __u32 pd_point; 222 __u16 nodelay:1, 223 disable_fragments:1, 224 v4mapped:1, 225 frag_interleave:1, 226 strm_interleave:1, 227 recvrcvinfo:1, 228 recvnxtinfo:1, 229 data_ready_signalled:1; 230 231 atomic_t pd_mode; 232 /* Receive to here while partial delivery is in effect. */ 233 struct sk_buff_head pd_lobby; 234 235 /* These must be the last fields, as they will skipped on copies, 236 * like on accept and peeloff operations 237 */ 238 struct list_head auto_asconf_list; 239 int do_auto_asconf; 240 }; 241 242 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 243 { 244 return (struct sctp_sock *)sk; 245 } 246 247 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 248 { 249 return (struct sock *)sp; 250 } 251 252 #if IS_ENABLED(CONFIG_IPV6) 253 struct sctp6_sock { 254 struct sctp_sock sctp; 255 struct ipv6_pinfo inet6; 256 }; 257 #endif /* CONFIG_IPV6 */ 258 259 260 /* This is our APPLICATION-SPECIFIC state cookie. 261 * THIS IS NOT DICTATED BY THE SPECIFICATION. 262 */ 263 /* These are the parts of an association which we send in the cookie. 264 * Most of these are straight out of: 265 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 266 * 267 */ 268 269 struct sctp_cookie { 270 271 /* My : Tag expected in every inbound packet and sent 272 * Verification: in the INIT or INIT ACK chunk. 273 * Tag : 274 */ 275 __u32 my_vtag; 276 277 /* Peer's : Tag expected in every outbound packet except 278 * Verification: in the INIT chunk. 279 * Tag : 280 */ 281 __u32 peer_vtag; 282 283 /* The rest of these are not from the spec, but really need to 284 * be in the cookie. 285 */ 286 287 /* My Tie Tag : Assist in discovering a restarting association. */ 288 __u32 my_ttag; 289 290 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 291 __u32 peer_ttag; 292 293 /* When does this cookie expire? */ 294 ktime_t expiration; 295 296 /* Number of inbound/outbound streams which are set 297 * and negotiated during the INIT process. 298 */ 299 __u16 sinit_num_ostreams; 300 __u16 sinit_max_instreams; 301 302 /* This is the first sequence number I used. */ 303 __u32 initial_tsn; 304 305 /* This holds the originating address of the INIT packet. */ 306 union sctp_addr peer_addr; 307 308 /* IG Section 2.35.3 309 * Include the source port of the INIT-ACK 310 */ 311 __u16 my_port; 312 313 __u8 prsctp_capable; 314 315 /* Padding for future use */ 316 __u8 padding; 317 318 __u32 adaptation_ind; 319 320 __u8 auth_random[sizeof(struct sctp_paramhdr) + 321 SCTP_AUTH_RANDOM_LENGTH]; 322 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 323 __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; 324 325 /* This is a shim for my peer's INIT packet, followed by 326 * a copy of the raw address list of the association. 327 * The length of the raw address list is saved in the 328 * raw_addr_list_len field, which will be used at the time when 329 * the association TCB is re-constructed from the cookie. 330 */ 331 __u32 raw_addr_list_len; 332 struct sctp_init_chunk peer_init[0]; 333 }; 334 335 336 /* The format of our cookie that we send to our peer. */ 337 struct sctp_signed_cookie { 338 __u8 signature[SCTP_SECRET_SIZE]; 339 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 340 struct sctp_cookie c; 341 } __packed; 342 343 /* This is another convenience type to allocate memory for address 344 * params for the maximum size and pass such structures around 345 * internally. 346 */ 347 union sctp_addr_param { 348 struct sctp_paramhdr p; 349 struct sctp_ipv4addr_param v4; 350 struct sctp_ipv6addr_param v6; 351 }; 352 353 /* A convenience type to allow walking through the various 354 * parameters and avoid casting all over the place. 355 */ 356 union sctp_params { 357 void *v; 358 struct sctp_paramhdr *p; 359 struct sctp_cookie_preserve_param *life; 360 struct sctp_hostname_param *dns; 361 struct sctp_cookie_param *cookie; 362 struct sctp_supported_addrs_param *sat; 363 struct sctp_ipv4addr_param *v4; 364 struct sctp_ipv6addr_param *v6; 365 union sctp_addr_param *addr; 366 struct sctp_adaptation_ind_param *aind; 367 struct sctp_supported_ext_param *ext; 368 struct sctp_random_param *random; 369 struct sctp_chunks_param *chunks; 370 struct sctp_hmac_algo_param *hmac_algo; 371 struct sctp_addip_param *addip; 372 }; 373 374 /* RFC 2960. Section 3.3.5 Heartbeat. 375 * Heartbeat Information: variable length 376 * The Sender-specific Heartbeat Info field should normally include 377 * information about the sender's current time when this HEARTBEAT 378 * chunk is sent and the destination transport address to which this 379 * HEARTBEAT is sent (see Section 8.3). 380 */ 381 struct sctp_sender_hb_info { 382 struct sctp_paramhdr param_hdr; 383 union sctp_addr daddr; 384 unsigned long sent_at; 385 __u64 hb_nonce; 386 }; 387 388 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 389 gfp_t gfp); 390 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid); 391 void sctp_stream_free(struct sctp_stream *stream); 392 void sctp_stream_clear(struct sctp_stream *stream); 393 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); 394 395 /* What is the current SSN number for this stream? */ 396 #define sctp_ssn_peek(stream, type, sid) \ 397 ((stream)->type[sid].ssn) 398 399 /* Return the next SSN number for this stream. */ 400 #define sctp_ssn_next(stream, type, sid) \ 401 ((stream)->type[sid].ssn++) 402 403 /* Skip over this ssn and all below. */ 404 #define sctp_ssn_skip(stream, type, sid, ssn) \ 405 ((stream)->type[sid].ssn = ssn + 1) 406 407 /* What is the current MID number for this stream? */ 408 #define sctp_mid_peek(stream, type, sid) \ 409 ((stream)->type[sid].mid) 410 411 /* Return the next MID number for this stream. */ 412 #define sctp_mid_next(stream, type, sid) \ 413 ((stream)->type[sid].mid++) 414 415 /* Skip over this mid and all below. */ 416 #define sctp_mid_skip(stream, type, sid, mid) \ 417 ((stream)->type[sid].mid = mid + 1) 418 419 #define sctp_stream_in(asoc, sid) (&(asoc)->stream.in[sid]) 420 421 /* What is the current MID_uo number for this stream? */ 422 #define sctp_mid_uo_peek(stream, type, sid) \ 423 ((stream)->type[sid].mid_uo) 424 425 /* Return the next MID_uo number for this stream. */ 426 #define sctp_mid_uo_next(stream, type, sid) \ 427 ((stream)->type[sid].mid_uo++) 428 429 /* 430 * Pointers to address related SCTP functions. 431 * (i.e. things that depend on the address family.) 432 */ 433 struct sctp_af { 434 int (*sctp_xmit) (struct sk_buff *skb, 435 struct sctp_transport *); 436 int (*setsockopt) (struct sock *sk, 437 int level, 438 int optname, 439 char __user *optval, 440 unsigned int optlen); 441 int (*getsockopt) (struct sock *sk, 442 int level, 443 int optname, 444 char __user *optval, 445 int __user *optlen); 446 int (*compat_setsockopt) (struct sock *sk, 447 int level, 448 int optname, 449 char __user *optval, 450 unsigned int optlen); 451 int (*compat_getsockopt) (struct sock *sk, 452 int level, 453 int optname, 454 char __user *optval, 455 int __user *optlen); 456 void (*get_dst) (struct sctp_transport *t, 457 union sctp_addr *saddr, 458 struct flowi *fl, 459 struct sock *sk); 460 void (*get_saddr) (struct sctp_sock *sk, 461 struct sctp_transport *t, 462 struct flowi *fl); 463 void (*copy_addrlist) (struct list_head *, 464 struct net_device *); 465 int (*cmp_addr) (const union sctp_addr *addr1, 466 const union sctp_addr *addr2); 467 void (*addr_copy) (union sctp_addr *dst, 468 union sctp_addr *src); 469 void (*from_skb) (union sctp_addr *, 470 struct sk_buff *skb, 471 int saddr); 472 void (*from_sk) (union sctp_addr *, 473 struct sock *sk); 474 void (*from_addr_param) (union sctp_addr *, 475 union sctp_addr_param *, 476 __be16 port, int iif); 477 int (*to_addr_param) (const union sctp_addr *, 478 union sctp_addr_param *); 479 int (*addr_valid) (union sctp_addr *, 480 struct sctp_sock *, 481 const struct sk_buff *); 482 enum sctp_scope (*scope)(union sctp_addr *); 483 void (*inaddr_any) (union sctp_addr *, __be16); 484 int (*is_any) (const union sctp_addr *); 485 int (*available) (union sctp_addr *, 486 struct sctp_sock *); 487 int (*skb_iif) (const struct sk_buff *sk); 488 int (*is_ce) (const struct sk_buff *sk); 489 void (*seq_dump_addr)(struct seq_file *seq, 490 union sctp_addr *addr); 491 void (*ecn_capable)(struct sock *sk); 492 __u16 net_header_len; 493 int sockaddr_len; 494 sa_family_t sa_family; 495 struct list_head list; 496 }; 497 498 struct sctp_af *sctp_get_af_specific(sa_family_t); 499 int sctp_register_af(struct sctp_af *); 500 501 /* Protocol family functions. */ 502 struct sctp_pf { 503 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 504 void (*skb_msgname) (struct sk_buff *, char *, int *); 505 int (*af_supported) (sa_family_t, struct sctp_sock *); 506 int (*cmp_addr) (const union sctp_addr *, 507 const union sctp_addr *, 508 struct sctp_sock *); 509 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 510 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 511 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 512 struct sock *(*create_accept_sk) (struct sock *sk, 513 struct sctp_association *asoc, 514 bool kern); 515 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 516 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 517 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 518 struct sctp_af *af; 519 }; 520 521 522 /* Structure to track chunk fragments that have been acked, but peer 523 * fragments of the same message have not. 524 */ 525 struct sctp_datamsg { 526 /* Chunks waiting to be submitted to lower layer. */ 527 struct list_head chunks; 528 /* Reference counting. */ 529 refcount_t refcnt; 530 /* When is this message no longer interesting to the peer? */ 531 unsigned long expires_at; 532 /* Did the messenge fail to send? */ 533 int send_error; 534 u8 send_failed:1, 535 can_delay:1, /* should this message be Nagle delayed */ 536 abandoned:1; /* should this message be abandoned */ 537 }; 538 539 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 540 struct sctp_sndrcvinfo *, 541 struct iov_iter *); 542 void sctp_datamsg_free(struct sctp_datamsg *); 543 void sctp_datamsg_put(struct sctp_datamsg *); 544 void sctp_chunk_fail(struct sctp_chunk *, int error); 545 int sctp_chunk_abandoned(struct sctp_chunk *); 546 547 /* RFC2960 1.4 Key Terms 548 * 549 * o Chunk: A unit of information within an SCTP packet, consisting of 550 * a chunk header and chunk-specific content. 551 * 552 * As a matter of convenience, we remember the SCTP common header for 553 * each chunk as well as a few other header pointers... 554 */ 555 struct sctp_chunk { 556 struct list_head list; 557 558 refcount_t refcnt; 559 560 /* How many times this chunk have been sent, for prsctp RTX policy */ 561 int sent_count; 562 563 union { 564 /* This is our link to the per-transport transmitted list. */ 565 struct list_head transmitted_list; 566 /* List in specific stream outq */ 567 struct list_head stream_list; 568 }; 569 570 /* This field is used by chunks that hold fragmented data. 571 * For the first fragment this is the list that holds the rest of 572 * fragments. For the remaining fragments, this is the link to the 573 * frag_list maintained in the first fragment. 574 */ 575 struct list_head frag_list; 576 577 /* This points to the sk_buff containing the actual data. */ 578 struct sk_buff *skb; 579 580 /* In case of GSO packets, this will store the head one */ 581 struct sk_buff *head_skb; 582 583 /* These are the SCTP headers by reverse order in a packet. 584 * Note that some of these may happen more than once. In that 585 * case, we point at the "current" one, whatever that means 586 * for that level of header. 587 */ 588 589 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 590 union sctp_params param_hdr; 591 union { 592 __u8 *v; 593 struct sctp_datahdr *data_hdr; 594 struct sctp_inithdr *init_hdr; 595 struct sctp_sackhdr *sack_hdr; 596 struct sctp_heartbeathdr *hb_hdr; 597 struct sctp_sender_hb_info *hbs_hdr; 598 struct sctp_shutdownhdr *shutdown_hdr; 599 struct sctp_signed_cookie *cookie_hdr; 600 struct sctp_ecnehdr *ecne_hdr; 601 struct sctp_cwrhdr *ecn_cwr_hdr; 602 struct sctp_errhdr *err_hdr; 603 struct sctp_addiphdr *addip_hdr; 604 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 605 struct sctp_authhdr *auth_hdr; 606 struct sctp_idatahdr *idata_hdr; 607 struct sctp_ifwdtsn_hdr *ifwdtsn_hdr; 608 } subh; 609 610 __u8 *chunk_end; 611 612 struct sctp_chunkhdr *chunk_hdr; 613 struct sctphdr *sctp_hdr; 614 615 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 616 struct sctp_sndrcvinfo sinfo; 617 618 /* Which association does this belong to? */ 619 struct sctp_association *asoc; 620 621 /* What endpoint received this chunk? */ 622 struct sctp_ep_common *rcvr; 623 624 /* We fill this in if we are calculating RTT. */ 625 unsigned long sent_at; 626 627 /* What is the origin IP address for this chunk? */ 628 union sctp_addr source; 629 /* Destination address for this chunk. */ 630 union sctp_addr dest; 631 632 /* For outbound message, track all fragments for SEND_FAILED. */ 633 struct sctp_datamsg *msg; 634 635 /* For an inbound chunk, this tells us where it came from. 636 * For an outbound chunk, it tells us where we'd like it to 637 * go. It is NULL if we have no preference. 638 */ 639 struct sctp_transport *transport; 640 641 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 642 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 643 * spec violates the principle premis that all chunks are processed 644 * in order. 645 */ 646 struct sk_buff *auth_chunk; 647 648 #define SCTP_CAN_FRTX 0x0 649 #define SCTP_NEED_FRTX 0x1 650 #define SCTP_DONT_FRTX 0x2 651 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 652 has_tsn:1, /* Does this chunk have a TSN yet? */ 653 has_ssn:1, /* Does this chunk have a SSN yet? */ 654 #define has_mid has_ssn 655 singleton:1, /* Only chunk in the packet? */ 656 end_of_packet:1, /* Last chunk in the packet? */ 657 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 658 pdiscard:1, /* Discard the whole packet now? */ 659 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 660 data_accepted:1, /* At least 1 chunk accepted */ 661 auth:1, /* IN: was auth'ed | OUT: needs auth */ 662 has_asconf:1, /* IN: have seen an asconf before */ 663 tsn_missing_report:2, /* Data chunk missing counter. */ 664 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 665 }; 666 667 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 668 void sctp_chunk_hold(struct sctp_chunk *); 669 void sctp_chunk_put(struct sctp_chunk *); 670 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 671 struct iov_iter *from); 672 void sctp_chunk_free(struct sctp_chunk *); 673 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 674 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 675 const struct sctp_association *, 676 struct sock *, gfp_t gfp); 677 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 678 union sctp_addr *); 679 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 680 681 static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) 682 { 683 return ntohs(ch->subh.data_hdr->stream); 684 } 685 686 enum { 687 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 688 SCTP_ADDR_SRC, /* address can be used as source */ 689 SCTP_ADDR_DEL, /* address about to be deleted */ 690 }; 691 692 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 693 struct sctp_sockaddr_entry { 694 struct list_head list; 695 struct rcu_head rcu; 696 union sctp_addr a; 697 __u8 state; 698 __u8 valid; 699 }; 700 701 #define SCTP_ADDRESS_TICK_DELAY 500 702 703 /* This structure holds lists of chunks as we are assembling for 704 * transmission. 705 */ 706 struct sctp_packet { 707 /* These are the SCTP header values (host order) for the packet. */ 708 __u16 source_port; 709 __u16 destination_port; 710 __u32 vtag; 711 712 /* This contains the payload chunks. */ 713 struct list_head chunk_list; 714 715 /* This is the overhead of the sctp and ip headers. */ 716 size_t overhead; 717 /* This is the total size of all chunks INCLUDING padding. */ 718 size_t size; 719 /* This is the maximum size this packet may have */ 720 size_t max_size; 721 722 /* The packet is destined for this transport address. 723 * The function we finally use to pass down to the next lower 724 * layer lives in the transport structure. 725 */ 726 struct sctp_transport *transport; 727 728 /* pointer to the auth chunk for this packet */ 729 struct sctp_chunk *auth; 730 731 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 732 has_sack:1, /* This packet contains a SACK chunk. */ 733 has_auth:1, /* This packet contains an AUTH chunk */ 734 has_data:1, /* This packet contains at least 1 DATA chunk */ 735 ipfragok:1; /* So let ip fragment this packet */ 736 }; 737 738 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 739 __u16 sport, __u16 dport); 740 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 741 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, 742 struct sctp_chunk *chunk, 743 int one_packet, gfp_t gfp); 744 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, 745 struct sctp_chunk *chunk); 746 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 747 void sctp_packet_free(struct sctp_packet *); 748 749 static inline int sctp_packet_empty(struct sctp_packet *packet) 750 { 751 return packet->size == packet->overhead; 752 } 753 754 /* This represents a remote transport address. 755 * For local transport addresses, we just use union sctp_addr. 756 * 757 * RFC2960 Section 1.4 Key Terms 758 * 759 * o Transport address: A Transport Address is traditionally defined 760 * by Network Layer address, Transport Layer protocol and Transport 761 * Layer port number. In the case of SCTP running over IP, a 762 * transport address is defined by the combination of an IP address 763 * and an SCTP port number (where SCTP is the Transport protocol). 764 * 765 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 766 * 767 * o The sender keeps a separate congestion control parameter set for 768 * each of the destination addresses it can send to (not each 769 * source-destination pair but for each destination). The parameters 770 * should decay if the address is not used for a long enough time 771 * period. 772 * 773 */ 774 struct sctp_transport { 775 /* A list of transports. */ 776 struct list_head transports; 777 struct rhlist_head node; 778 779 /* Reference counting. */ 780 refcount_t refcnt; 781 /* RTO-Pending : A flag used to track if one of the DATA 782 * chunks sent to this address is currently being 783 * used to compute a RTT. If this flag is 0, 784 * the next DATA chunk sent to this destination 785 * should be used to compute a RTT and this flag 786 * should be set. Every time the RTT 787 * calculation completes (i.e. the DATA chunk 788 * is SACK'd) clear this flag. 789 */ 790 __u32 rto_pending:1, 791 792 /* 793 * hb_sent : a flag that signals that we have a pending 794 * heartbeat. 795 */ 796 hb_sent:1, 797 798 /* Is the Path MTU update pending on this tranport */ 799 pmtu_pending:1, 800 801 dst_pending_confirm:1, /* need to confirm neighbour */ 802 803 /* Has this transport moved the ctsn since we last sacked */ 804 sack_generation:1; 805 u32 dst_cookie; 806 807 struct flowi fl; 808 809 /* This is the peer's IP address and port. */ 810 union sctp_addr ipaddr; 811 812 /* These are the functions we call to handle LLP stuff. */ 813 struct sctp_af *af_specific; 814 815 /* Which association do we belong to? */ 816 struct sctp_association *asoc; 817 818 /* RFC2960 819 * 820 * 12.3 Per Transport Address Data 821 * 822 * For each destination transport address in the peer's 823 * address list derived from the INIT or INIT ACK chunk, a 824 * number of data elements needs to be maintained including: 825 */ 826 /* RTO : The current retransmission timeout value. */ 827 unsigned long rto; 828 829 __u32 rtt; /* This is the most recent RTT. */ 830 831 /* RTTVAR : The current RTT variation. */ 832 __u32 rttvar; 833 834 /* SRTT : The current smoothed round trip time. */ 835 __u32 srtt; 836 837 /* 838 * These are the congestion stats. 839 */ 840 /* cwnd : The current congestion window. */ 841 __u32 cwnd; /* This is the actual cwnd. */ 842 843 /* ssthresh : The current slow start threshold value. */ 844 __u32 ssthresh; 845 846 /* partial : The tracking method for increase of cwnd when in 847 * bytes acked : congestion avoidance mode (see Section 6.2.2) 848 */ 849 __u32 partial_bytes_acked; 850 851 /* Data that has been sent, but not acknowledged. */ 852 __u32 flight_size; 853 854 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 855 856 /* Destination */ 857 struct dst_entry *dst; 858 /* Source address. */ 859 union sctp_addr saddr; 860 861 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 862 * the destination address every heartbeat interval. 863 */ 864 unsigned long hbinterval; 865 866 /* SACK delay timeout */ 867 unsigned long sackdelay; 868 __u32 sackfreq; 869 870 /* When was the last time that we heard from this transport? We use 871 * this to pick new active and retran paths. 872 */ 873 ktime_t last_time_heard; 874 875 /* When was the last time that we sent a chunk using this 876 * transport? We use this to check for idle transports 877 */ 878 unsigned long last_time_sent; 879 880 /* Last time(in jiffies) when cwnd is reduced due to the congestion 881 * indication based on ECNE chunk. 882 */ 883 unsigned long last_time_ecne_reduced; 884 885 /* This is the max_retrans value for the transport and will 886 * be initialized from the assocs value. This can be changed 887 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 888 */ 889 __u16 pathmaxrxt; 890 891 /* This is the partially failed retrans value for the transport 892 * and will be initialized from the assocs value. This can be changed 893 * using the SCTP_PEER_ADDR_THLDS socket option 894 */ 895 int pf_retrans; 896 /* PMTU : The current known path MTU. */ 897 __u32 pathmtu; 898 899 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 900 __u32 param_flags; 901 902 /* The number of times INIT has been sent on this transport. */ 903 int init_sent_count; 904 905 /* state : The current state of this destination, 906 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 907 */ 908 int state; 909 910 /* These are the error stats for this destination. */ 911 912 /* Error count : The current error count for this destination. */ 913 unsigned short error_count; 914 915 /* Per : A timer used by each destination. 916 * Destination : 917 * Timer : 918 * 919 * [Everywhere else in the text this is called T3-rtx. -ed] 920 */ 921 struct timer_list T3_rtx_timer; 922 923 /* Heartbeat timer is per destination. */ 924 struct timer_list hb_timer; 925 926 /* Timer to handle ICMP proto unreachable envets */ 927 struct timer_list proto_unreach_timer; 928 929 /* Timer to handler reconf chunk rtx */ 930 struct timer_list reconf_timer; 931 932 /* Since we're using per-destination retransmission timers 933 * (see above), we're also using per-destination "transmitted" 934 * queues. This probably ought to be a private struct 935 * accessible only within the outqueue, but it's not, yet. 936 */ 937 struct list_head transmitted; 938 939 /* We build bundle-able packets for this transport here. */ 940 struct sctp_packet packet; 941 942 /* This is the list of transports that have chunks to send. */ 943 struct list_head send_ready; 944 945 /* State information saved for SFR_CACC algorithm. The key 946 * idea in SFR_CACC is to maintain state at the sender on a 947 * per-destination basis when a changeover happens. 948 * char changeover_active; 949 * char cycling_changeover; 950 * __u32 next_tsn_at_change; 951 * char cacc_saw_newack; 952 */ 953 struct { 954 /* An unsigned integer, which stores the next TSN to be 955 * used by the sender, at the moment of changeover. 956 */ 957 __u32 next_tsn_at_change; 958 959 /* A flag which indicates the occurrence of a changeover */ 960 char changeover_active; 961 962 /* A flag which indicates whether the change of primary is 963 * the first switch to this destination address during an 964 * active switch. 965 */ 966 char cycling_changeover; 967 968 /* A temporary flag, which is used during the processing of 969 * a SACK to estimate the causative TSN(s)'s group. 970 */ 971 char cacc_saw_newack; 972 } cacc; 973 974 /* 64-bit random number sent with heartbeat. */ 975 __u64 hb_nonce; 976 977 struct rcu_head rcu; 978 }; 979 980 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 981 gfp_t); 982 void sctp_transport_set_owner(struct sctp_transport *, 983 struct sctp_association *); 984 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 985 struct sctp_sock *); 986 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 987 void sctp_transport_free(struct sctp_transport *); 988 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 989 void sctp_transport_reset_hb_timer(struct sctp_transport *); 990 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 991 int sctp_transport_hold(struct sctp_transport *); 992 void sctp_transport_put(struct sctp_transport *); 993 void sctp_transport_update_rto(struct sctp_transport *, __u32); 994 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 995 void sctp_transport_lower_cwnd(struct sctp_transport *t, 996 enum sctp_lower_cwnd reason); 997 void sctp_transport_burst_limited(struct sctp_transport *); 998 void sctp_transport_burst_reset(struct sctp_transport *); 999 unsigned long sctp_transport_timeout(struct sctp_transport *); 1000 void sctp_transport_reset(struct sctp_transport *t); 1001 bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); 1002 void sctp_transport_immediate_rtx(struct sctp_transport *); 1003 void sctp_transport_dst_release(struct sctp_transport *t); 1004 void sctp_transport_dst_confirm(struct sctp_transport *t); 1005 1006 1007 /* This is the structure we use to queue packets as they come into 1008 * SCTP. We write packets to it and read chunks from it. 1009 */ 1010 struct sctp_inq { 1011 /* This is actually a queue of sctp_chunk each 1012 * containing a partially decoded packet. 1013 */ 1014 struct list_head in_chunk_list; 1015 /* This is the packet which is currently off the in queue and is 1016 * being worked on through the inbound chunk processing. 1017 */ 1018 struct sctp_chunk *in_progress; 1019 1020 /* This is the delayed task to finish delivering inbound 1021 * messages. 1022 */ 1023 struct work_struct immediate; 1024 }; 1025 1026 void sctp_inq_init(struct sctp_inq *); 1027 void sctp_inq_free(struct sctp_inq *); 1028 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1029 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1030 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1031 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1032 1033 /* This is the structure we use to hold outbound chunks. You push 1034 * chunks in and they automatically pop out the other end as bundled 1035 * packets (it calls (*output_handler)()). 1036 * 1037 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1038 * and 8.2 of the v13 draft. 1039 * 1040 * It handles retransmissions. The connection to the timeout portion 1041 * of the state machine is through sctp_..._timeout() and timeout_handler. 1042 * 1043 * If you feed it SACKs, it will eat them. 1044 * 1045 * If you give it big chunks, it will fragment them. 1046 * 1047 * It assigns TSN's to data chunks. This happens at the last possible 1048 * instant before transmission. 1049 * 1050 * When free()'d, it empties itself out via output_handler(). 1051 */ 1052 struct sctp_outq { 1053 struct sctp_association *asoc; 1054 1055 /* Data pending that has never been transmitted. */ 1056 struct list_head out_chunk_list; 1057 1058 /* Stream scheduler being used */ 1059 struct sctp_sched_ops *sched; 1060 1061 unsigned int out_qlen; /* Total length of queued data chunks. */ 1062 1063 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1064 unsigned int error; 1065 1066 /* These are control chunks we want to send. */ 1067 struct list_head control_chunk_list; 1068 1069 /* These are chunks that have been sacked but are above the 1070 * CTSN, or cumulative tsn ack point. 1071 */ 1072 struct list_head sacked; 1073 1074 /* Put chunks on this list to schedule them for 1075 * retransmission. 1076 */ 1077 struct list_head retransmit; 1078 1079 /* Put chunks on this list to save them for FWD TSN processing as 1080 * they were abandoned. 1081 */ 1082 struct list_head abandoned; 1083 1084 /* How many unackd bytes do we have in-flight? */ 1085 __u32 outstanding_bytes; 1086 1087 /* Are we doing fast-rtx on this queue */ 1088 char fast_rtx; 1089 1090 /* Corked? */ 1091 char cork; 1092 }; 1093 1094 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1095 void sctp_outq_teardown(struct sctp_outq *); 1096 void sctp_outq_free(struct sctp_outq*); 1097 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1098 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1099 int sctp_outq_is_empty(const struct sctp_outq *); 1100 void sctp_outq_restart(struct sctp_outq *); 1101 1102 void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, 1103 enum sctp_retransmit_reason reason); 1104 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1105 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1106 void sctp_prsctp_prune(struct sctp_association *asoc, 1107 struct sctp_sndrcvinfo *sinfo, int msg_len); 1108 void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 sack_ctsn); 1109 /* Uncork and flush an outqueue. */ 1110 static inline void sctp_outq_cork(struct sctp_outq *q) 1111 { 1112 q->cork = 1; 1113 } 1114 1115 /* SCTP skb control block. 1116 * sctp_input_cb is currently used on rx and sock rx queue 1117 */ 1118 struct sctp_input_cb { 1119 union { 1120 struct inet_skb_parm h4; 1121 #if IS_ENABLED(CONFIG_IPV6) 1122 struct inet6_skb_parm h6; 1123 #endif 1124 } header; 1125 struct sctp_chunk *chunk; 1126 struct sctp_af *af; 1127 }; 1128 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1129 1130 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1131 { 1132 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1133 1134 return chunk->head_skb ? : skb; 1135 } 1136 1137 /* These bind address data fields common between endpoints and associations */ 1138 struct sctp_bind_addr { 1139 1140 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1141 * 1142 * SCTP Port: The local SCTP port number the endpoint is 1143 * bound to. 1144 */ 1145 __u16 port; 1146 1147 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1148 * 1149 * Address List: The list of IP addresses that this instance 1150 * has bound. This information is passed to one's 1151 * peer(s) in INIT and INIT ACK chunks. 1152 */ 1153 struct list_head address_list; 1154 }; 1155 1156 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1157 void sctp_bind_addr_free(struct sctp_bind_addr *); 1158 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1159 const struct sctp_bind_addr *src, 1160 enum sctp_scope scope, gfp_t gfp, 1161 int flags); 1162 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1163 const struct sctp_bind_addr *src, 1164 gfp_t gfp); 1165 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1166 int new_size, __u8 addr_state, gfp_t gfp); 1167 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1168 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1169 struct sctp_sock *); 1170 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1171 struct sctp_sock *, struct sctp_sock *); 1172 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1173 const union sctp_addr *addr); 1174 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1175 const union sctp_addr *addrs, 1176 int addrcnt, 1177 struct sctp_sock *opt); 1178 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1179 int *addrs_len, 1180 gfp_t gfp); 1181 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1182 __u16 port, gfp_t gfp); 1183 1184 enum sctp_scope sctp_scope(const union sctp_addr *addr); 1185 int sctp_in_scope(struct net *net, const union sctp_addr *addr, 1186 const enum sctp_scope scope); 1187 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1188 int sctp_is_ep_boundall(struct sock *sk); 1189 1190 1191 /* What type of endpoint? */ 1192 enum sctp_endpoint_type { 1193 SCTP_EP_TYPE_SOCKET, 1194 SCTP_EP_TYPE_ASSOCIATION, 1195 }; 1196 1197 /* 1198 * A common base class to bridge the implmentation view of a 1199 * socket (usually listening) endpoint versus an association's 1200 * local endpoint. 1201 * This common structure is useful for several purposes: 1202 * 1) Common interface for lookup routines. 1203 * a) Subfunctions work for either endpoint or association 1204 * b) Single interface to lookup allows hiding the lookup lock rather 1205 * than acquiring it externally. 1206 * 2) Common interface for the inbound chunk handling/state machine. 1207 * 3) Common object handling routines for reference counting, etc. 1208 * 4) Disentangle association lookup from endpoint lookup, where we 1209 * do not have to find our endpoint to find our association. 1210 * 1211 */ 1212 1213 struct sctp_ep_common { 1214 /* Fields to help us manage our entries in the hash tables. */ 1215 struct hlist_node node; 1216 int hashent; 1217 1218 /* Runtime type information. What kind of endpoint is this? */ 1219 enum sctp_endpoint_type type; 1220 1221 /* Some fields to help us manage this object. 1222 * refcnt - Reference count access to this object. 1223 * dead - Do not attempt to use this object. 1224 */ 1225 refcount_t refcnt; 1226 bool dead; 1227 1228 /* What socket does this endpoint belong to? */ 1229 struct sock *sk; 1230 1231 /* This is where we receive inbound chunks. */ 1232 struct sctp_inq inqueue; 1233 1234 /* This substructure includes the defining parameters of the 1235 * endpoint: 1236 * bind_addr.port is our shared port number. 1237 * bind_addr.address_list is our set of local IP addresses. 1238 */ 1239 struct sctp_bind_addr bind_addr; 1240 }; 1241 1242 1243 /* RFC Section 1.4 Key Terms 1244 * 1245 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1246 * multi-homed host, an SCTP endpoint is represented to its peers as a 1247 * combination of a set of eligible destination transport addresses to 1248 * which SCTP packets can be sent and a set of eligible source 1249 * transport addresses from which SCTP packets can be received. 1250 * All transport addresses used by an SCTP endpoint must use the 1251 * same port number, but can use multiple IP addresses. A transport 1252 * address used by an SCTP endpoint must not be used by another 1253 * SCTP endpoint. In other words, a transport address is unique 1254 * to an SCTP endpoint. 1255 * 1256 * From an implementation perspective, each socket has one of these. 1257 * A TCP-style socket will have exactly one association on one of 1258 * these. An UDP-style socket will have multiple associations hanging 1259 * off one of these. 1260 */ 1261 1262 struct sctp_endpoint { 1263 /* Common substructure for endpoint and association. */ 1264 struct sctp_ep_common base; 1265 1266 /* Associations: A list of current associations and mappings 1267 * to the data consumers for each association. This 1268 * may be in the form of a hash table or other 1269 * implementation dependent structure. The data 1270 * consumers may be process identification 1271 * information such as file descriptors, named pipe 1272 * pointer, or table pointers dependent on how SCTP 1273 * is implemented. 1274 */ 1275 /* This is really a list of struct sctp_association entries. */ 1276 struct list_head asocs; 1277 1278 /* Secret Key: A secret key used by this endpoint to compute 1279 * the MAC. This SHOULD be a cryptographic quality 1280 * random number with a sufficient length. 1281 * Discussion in [RFC1750] can be helpful in 1282 * selection of the key. 1283 */ 1284 __u8 secret_key[SCTP_SECRET_SIZE]; 1285 1286 /* digest: This is a digest of the sctp cookie. This field is 1287 * only used on the receive path when we try to validate 1288 * that the cookie has not been tampered with. We put 1289 * this here so we pre-allocate this once and can re-use 1290 * on every receive. 1291 */ 1292 __u8 *digest; 1293 1294 /* sendbuf acct. policy. */ 1295 __u32 sndbuf_policy; 1296 1297 /* rcvbuf acct. policy. */ 1298 __u32 rcvbuf_policy; 1299 1300 /* SCTP AUTH: array of the HMACs that will be allocated 1301 * we need this per association so that we don't serialize 1302 */ 1303 struct crypto_shash **auth_hmacs; 1304 1305 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1306 struct sctp_hmac_algo_param *auth_hmacs_list; 1307 1308 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1309 struct sctp_chunks_param *auth_chunk_list; 1310 1311 /* SCTP-AUTH: endpoint shared keys */ 1312 struct list_head endpoint_shared_keys; 1313 __u16 active_key_id; 1314 __u8 auth_enable:1, 1315 prsctp_enable:1, 1316 reconf_enable:1; 1317 1318 __u8 strreset_enable; 1319 }; 1320 1321 /* Recover the outter endpoint structure. */ 1322 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1323 { 1324 struct sctp_endpoint *ep; 1325 1326 ep = container_of(base, struct sctp_endpoint, base); 1327 return ep; 1328 } 1329 1330 /* These are function signatures for manipulating endpoints. */ 1331 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1332 void sctp_endpoint_free(struct sctp_endpoint *); 1333 void sctp_endpoint_put(struct sctp_endpoint *); 1334 void sctp_endpoint_hold(struct sctp_endpoint *); 1335 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1336 struct sctp_association *sctp_endpoint_lookup_assoc( 1337 const struct sctp_endpoint *ep, 1338 const union sctp_addr *paddr, 1339 struct sctp_transport **); 1340 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1341 const union sctp_addr *); 1342 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1343 struct net *, const union sctp_addr *); 1344 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1345 const union sctp_addr *paddr); 1346 1347 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1348 const struct sctp_association *asoc, 1349 enum sctp_cid cid, struct sctp_init_chunk *peer_init, 1350 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1351 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1352 const union sctp_addr *peer, 1353 struct sctp_init_chunk *init, gfp_t gfp); 1354 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1355 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1356 1357 struct sctp_inithdr_host { 1358 __u32 init_tag; 1359 __u32 a_rwnd; 1360 __u16 num_outbound_streams; 1361 __u16 num_inbound_streams; 1362 __u32 initial_tsn; 1363 }; 1364 1365 struct sctp_stream_priorities { 1366 /* List of priorities scheduled */ 1367 struct list_head prio_sched; 1368 /* List of streams scheduled */ 1369 struct list_head active; 1370 /* The next stream stream in line */ 1371 struct sctp_stream_out_ext *next; 1372 __u16 prio; 1373 }; 1374 1375 struct sctp_stream_out_ext { 1376 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1377 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1378 struct list_head outq; /* chunks enqueued by this stream */ 1379 union { 1380 struct { 1381 /* Scheduled streams list */ 1382 struct list_head prio_list; 1383 struct sctp_stream_priorities *prio_head; 1384 }; 1385 /* Fields used by RR scheduler */ 1386 struct { 1387 struct list_head rr_list; 1388 }; 1389 }; 1390 }; 1391 1392 struct sctp_stream_out { 1393 union { 1394 __u32 mid; 1395 __u16 ssn; 1396 }; 1397 __u32 mid_uo; 1398 struct sctp_stream_out_ext *ext; 1399 __u8 state; 1400 }; 1401 1402 struct sctp_stream_in { 1403 union { 1404 __u32 mid; 1405 __u16 ssn; 1406 }; 1407 __u32 mid_uo; 1408 __u32 fsn; 1409 __u32 fsn_uo; 1410 char pd_mode; 1411 char pd_mode_uo; 1412 }; 1413 1414 struct sctp_stream { 1415 struct sctp_stream_out *out; 1416 struct sctp_stream_in *in; 1417 __u16 outcnt; 1418 __u16 incnt; 1419 /* Current stream being sent, if any */ 1420 struct sctp_stream_out *out_curr; 1421 union { 1422 /* Fields used by priority scheduler */ 1423 struct { 1424 /* List of priorities scheduled */ 1425 struct list_head prio_list; 1426 }; 1427 /* Fields used by RR scheduler */ 1428 struct { 1429 /* List of streams scheduled */ 1430 struct list_head rr_list; 1431 /* The next stream stream in line */ 1432 struct sctp_stream_out_ext *rr_next; 1433 }; 1434 }; 1435 struct sctp_stream_interleave *si; 1436 }; 1437 1438 #define SCTP_STREAM_CLOSED 0x00 1439 #define SCTP_STREAM_OPEN 0x01 1440 1441 static inline __u16 sctp_datachk_len(const struct sctp_stream *stream) 1442 { 1443 return stream->si->data_chunk_len; 1444 } 1445 1446 static inline __u16 sctp_datahdr_len(const struct sctp_stream *stream) 1447 { 1448 return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr); 1449 } 1450 1451 static inline __u16 sctp_ftsnchk_len(const struct sctp_stream *stream) 1452 { 1453 return stream->si->ftsn_chunk_len; 1454 } 1455 1456 static inline __u16 sctp_ftsnhdr_len(const struct sctp_stream *stream) 1457 { 1458 return stream->si->ftsn_chunk_len - sizeof(struct sctp_chunkhdr); 1459 } 1460 1461 /* SCTP_GET_ASSOC_STATS counters */ 1462 struct sctp_priv_assoc_stats { 1463 /* Maximum observed rto in the association during subsequent 1464 * observations. Value is set to 0 if no RTO measurement took place 1465 * The transport where the max_rto was observed is returned in 1466 * obs_rto_ipaddr 1467 */ 1468 struct sockaddr_storage obs_rto_ipaddr; 1469 __u64 max_obs_rto; 1470 /* Total In and Out SACKs received and sent */ 1471 __u64 isacks; 1472 __u64 osacks; 1473 /* Total In and Out packets received and sent */ 1474 __u64 opackets; 1475 __u64 ipackets; 1476 /* Total retransmitted chunks */ 1477 __u64 rtxchunks; 1478 /* TSN received > next expected */ 1479 __u64 outofseqtsns; 1480 /* Duplicate Chunks received */ 1481 __u64 idupchunks; 1482 /* Gap Ack Blocks received */ 1483 __u64 gapcnt; 1484 /* Unordered data chunks sent and received */ 1485 __u64 ouodchunks; 1486 __u64 iuodchunks; 1487 /* Ordered data chunks sent and received */ 1488 __u64 oodchunks; 1489 __u64 iodchunks; 1490 /* Control chunks sent and received */ 1491 __u64 octrlchunks; 1492 __u64 ictrlchunks; 1493 }; 1494 1495 /* RFC2960 1496 * 1497 * 12. Recommended Transmission Control Block (TCB) Parameters 1498 * 1499 * This section details a recommended set of parameters that should 1500 * be contained within the TCB for an implementation. This section is 1501 * for illustrative purposes and should not be deemed as requirements 1502 * on an implementation or as an exhaustive list of all parameters 1503 * inside an SCTP TCB. Each implementation may need its own additional 1504 * parameters for optimization. 1505 */ 1506 1507 1508 /* Here we have information about each individual association. */ 1509 struct sctp_association { 1510 1511 /* A base structure common to endpoint and association. 1512 * In this context, it represents the associations's view 1513 * of the local endpoint of the association. 1514 */ 1515 struct sctp_ep_common base; 1516 1517 /* Associations on the same socket. */ 1518 struct list_head asocs; 1519 1520 /* association id. */ 1521 sctp_assoc_t assoc_id; 1522 1523 /* This is our parent endpoint. */ 1524 struct sctp_endpoint *ep; 1525 1526 /* These are those association elements needed in the cookie. */ 1527 struct sctp_cookie c; 1528 1529 /* This is all information about our peer. */ 1530 struct { 1531 /* transport_addr_list 1532 * 1533 * Peer : A list of SCTP transport addresses that the 1534 * Transport : peer is bound to. This information is derived 1535 * Address : from the INIT or INIT ACK and is used to 1536 * List : associate an inbound packet with a given 1537 * : association. Normally this information is 1538 * : hashed or keyed for quick lookup and access 1539 * : of the TCB. 1540 * : The list is also initialized with the list 1541 * : of addresses passed with the sctp_connectx() 1542 * : call. 1543 * 1544 * It is a list of SCTP_transport's. 1545 */ 1546 struct list_head transport_addr_list; 1547 1548 /* rwnd 1549 * 1550 * Peer Rwnd : Current calculated value of the peer's rwnd. 1551 */ 1552 __u32 rwnd; 1553 1554 /* transport_count 1555 * 1556 * Peer : A count of the number of peer addresses 1557 * Transport : in the Peer Transport Address List. 1558 * Address : 1559 * Count : 1560 */ 1561 __u16 transport_count; 1562 1563 /* port 1564 * The transport layer port number. 1565 */ 1566 __u16 port; 1567 1568 /* primary_path 1569 * 1570 * Primary : This is the current primary destination 1571 * Path : transport address of the peer endpoint. It 1572 * : may also specify a source transport address 1573 * : on this endpoint. 1574 * 1575 * All of these paths live on transport_addr_list. 1576 * 1577 * At the bakeoffs, we discovered that the intent of 1578 * primaryPath is that it only changes when the ULP 1579 * asks to have it changed. We add the activePath to 1580 * designate the connection we are currently using to 1581 * transmit new data and most control chunks. 1582 */ 1583 struct sctp_transport *primary_path; 1584 1585 /* Cache the primary path address here, when we 1586 * need a an address for msg_name. 1587 */ 1588 union sctp_addr primary_addr; 1589 1590 /* active_path 1591 * The path that we are currently using to 1592 * transmit new data and most control chunks. 1593 */ 1594 struct sctp_transport *active_path; 1595 1596 /* retran_path 1597 * 1598 * RFC2960 6.4 Multi-homed SCTP Endpoints 1599 * ... 1600 * Furthermore, when its peer is multi-homed, an 1601 * endpoint SHOULD try to retransmit a chunk to an 1602 * active destination transport address that is 1603 * different from the last destination address to 1604 * which the DATA chunk was sent. 1605 */ 1606 struct sctp_transport *retran_path; 1607 1608 /* Pointer to last transport I have sent on. */ 1609 struct sctp_transport *last_sent_to; 1610 1611 /* This is the last transport I have received DATA on. */ 1612 struct sctp_transport *last_data_from; 1613 1614 /* 1615 * Mapping An array of bits or bytes indicating which out of 1616 * Array order TSN's have been received (relative to the 1617 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1618 * order packets have been received, this array 1619 * will be set to all zero. This structure may be 1620 * in the form of a circular buffer or bit array. 1621 * 1622 * Last Rcvd : This is the last TSN received in 1623 * TSN : sequence. This value is set initially by 1624 * : taking the peer's Initial TSN, received in 1625 * : the INIT or INIT ACK chunk, and subtracting 1626 * : one from it. 1627 * 1628 * Throughout most of the specification this is called the 1629 * "Cumulative TSN ACK Point". In this case, we 1630 * ignore the advice in 12.2 in favour of the term 1631 * used in the bulk of the text. This value is hidden 1632 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1633 */ 1634 struct sctp_tsnmap tsn_map; 1635 1636 /* This mask is used to disable sending the ASCONF chunk 1637 * with specified parameter to peer. 1638 */ 1639 __be16 addip_disabled_mask; 1640 1641 /* These are capabilities which our peer advertised. */ 1642 __u8 ecn_capable:1, /* Can peer do ECN? */ 1643 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1644 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1645 hostname_address:1, /* Peer understands DNS addresses? */ 1646 asconf_capable:1, /* Does peer support ADDIP? */ 1647 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1648 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1649 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1650 1651 /* sack_needed : This flag indicates if the next received 1652 * : packet is to be responded to with a 1653 * : SACK. This is initialized to 0. When a packet 1654 * : is received sack_cnt is incremented. If this value 1655 * : reaches 2 or more, a SACK is sent and the 1656 * : value is reset to 0. Note: This is used only 1657 * : when no DATA chunks are received out of 1658 * : order. When DATA chunks are out of order, 1659 * : SACK's are not delayed (see Section 6). 1660 */ 1661 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1662 sack_generation:1, 1663 zero_window_announced:1; 1664 __u32 sack_cnt; 1665 1666 __u32 adaptation_ind; /* Adaptation Code point. */ 1667 1668 struct sctp_inithdr_host i; 1669 void *cookie; 1670 int cookie_len; 1671 1672 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1673 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1674 * Initial TSN Value minus 1 1675 */ 1676 __u32 addip_serial; 1677 1678 /* SCTP-AUTH: We need to know pears random number, hmac list 1679 * and authenticated chunk list. All that is part of the 1680 * cookie and these are just pointers to those locations 1681 */ 1682 struct sctp_random_param *peer_random; 1683 struct sctp_chunks_param *peer_chunks; 1684 struct sctp_hmac_algo_param *peer_hmacs; 1685 } peer; 1686 1687 /* State : A state variable indicating what state the 1688 * : association is in, i.e. COOKIE-WAIT, 1689 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1690 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1691 * 1692 * Note: No "CLOSED" state is illustrated since if a 1693 * association is "CLOSED" its TCB SHOULD be removed. 1694 * 1695 * In this implementation we DO have a CLOSED 1696 * state which is used during initiation and shutdown. 1697 * 1698 * State takes values from SCTP_STATE_*. 1699 */ 1700 enum sctp_state state; 1701 1702 /* Overall : The overall association error count. 1703 * Error Count : [Clear this any time I get something.] 1704 */ 1705 int overall_error_count; 1706 1707 /* The cookie life I award for any cookie. */ 1708 ktime_t cookie_life; 1709 1710 /* These are the association's initial, max, and min RTO values. 1711 * These values will be initialized by system defaults, but can 1712 * be modified via the SCTP_RTOINFO socket option. 1713 */ 1714 unsigned long rto_initial; 1715 unsigned long rto_max; 1716 unsigned long rto_min; 1717 1718 /* Maximum number of new data packets that can be sent in a burst. */ 1719 int max_burst; 1720 1721 /* This is the max_retrans value for the association. This value will 1722 * be initialized initialized from system defaults, but can be 1723 * modified by the SCTP_ASSOCINFO socket option. 1724 */ 1725 int max_retrans; 1726 1727 /* This is the partially failed retrans value for the transport 1728 * and will be initialized from the assocs value. This can be 1729 * changed using the SCTP_PEER_ADDR_THLDS socket option 1730 */ 1731 int pf_retrans; 1732 1733 /* Maximum number of times the endpoint will retransmit INIT */ 1734 __u16 max_init_attempts; 1735 1736 /* How many times have we resent an INIT? */ 1737 __u16 init_retries; 1738 1739 /* The largest timeout or RTO value to use in attempting an INIT */ 1740 unsigned long max_init_timeo; 1741 1742 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1743 * the destination address every heartbeat interval. This value 1744 * will be inherited by all new transports. 1745 */ 1746 unsigned long hbinterval; 1747 1748 /* This is the max_retrans value for new transports in the 1749 * association. 1750 */ 1751 __u16 pathmaxrxt; 1752 1753 /* Flag that path mtu update is pending */ 1754 __u8 pmtu_pending; 1755 1756 /* Association : The smallest PMTU discovered for all of the 1757 * PMTU : peer's transport addresses. 1758 */ 1759 __u32 pathmtu; 1760 1761 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1762 __u32 param_flags; 1763 1764 __u32 sackfreq; 1765 /* SACK delay timeout */ 1766 unsigned long sackdelay; 1767 1768 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1769 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1770 1771 /* Transport to which SHUTDOWN chunk was last sent. */ 1772 struct sctp_transport *shutdown_last_sent_to; 1773 1774 /* Transport to which INIT chunk was last sent. */ 1775 struct sctp_transport *init_last_sent_to; 1776 1777 /* How many times have we resent a SHUTDOWN */ 1778 int shutdown_retries; 1779 1780 /* Next TSN : The next TSN number to be assigned to a new 1781 * : DATA chunk. This is sent in the INIT or INIT 1782 * : ACK chunk to the peer and incremented each 1783 * : time a DATA chunk is assigned a TSN 1784 * : (normally just prior to transmit or during 1785 * : fragmentation). 1786 */ 1787 __u32 next_tsn; 1788 1789 /* 1790 * Last Rcvd : This is the last TSN received in sequence. This value 1791 * TSN : is set initially by taking the peer's Initial TSN, 1792 * : received in the INIT or INIT ACK chunk, and 1793 * : subtracting one from it. 1794 * 1795 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1796 */ 1797 1798 __u32 ctsn_ack_point; 1799 1800 /* PR-SCTP Advanced.Peer.Ack.Point */ 1801 __u32 adv_peer_ack_point; 1802 1803 /* Highest TSN that is acknowledged by incoming SACKs. */ 1804 __u32 highest_sacked; 1805 1806 /* TSN marking the fast recovery exit point */ 1807 __u32 fast_recovery_exit; 1808 1809 /* Flag to track the current fast recovery state */ 1810 __u8 fast_recovery; 1811 1812 /* The number of unacknowledged data chunks. Reported through 1813 * the SCTP_STATUS sockopt. 1814 */ 1815 __u16 unack_data; 1816 1817 /* The total number of data chunks that we've had to retransmit 1818 * as the result of a T3 timer expiration 1819 */ 1820 __u32 rtx_data_chunks; 1821 1822 /* This is the association's receive buffer space. This value is used 1823 * to set a_rwnd field in an INIT or a SACK chunk. 1824 */ 1825 __u32 rwnd; 1826 1827 /* This is the last advertised value of rwnd over a SACK chunk. */ 1828 __u32 a_rwnd; 1829 1830 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1831 * to slop over a maximum of the association's frag_point. 1832 */ 1833 __u32 rwnd_over; 1834 1835 /* Keeps treack of rwnd pressure. This happens when we have 1836 * a window, but not recevie buffer (i.e small packets). This one 1837 * is releases slowly (1 PMTU at a time ). 1838 */ 1839 __u32 rwnd_press; 1840 1841 /* This is the sndbuf size in use for the association. 1842 * This corresponds to the sndbuf size for the association, 1843 * as specified in the sk->sndbuf. 1844 */ 1845 int sndbuf_used; 1846 1847 /* This is the amount of memory that this association has allocated 1848 * in the receive path at any given time. 1849 */ 1850 atomic_t rmem_alloc; 1851 1852 /* This is the wait queue head for send requests waiting on 1853 * the association sndbuf space. 1854 */ 1855 wait_queue_head_t wait; 1856 1857 /* The message size at which SCTP fragmentation will occur. */ 1858 __u32 frag_point; 1859 __u32 user_frag; 1860 1861 /* Counter used to count INIT errors. */ 1862 int init_err_counter; 1863 1864 /* Count the number of INIT cycles (for doubling timeout). */ 1865 int init_cycle; 1866 1867 /* Default send parameters. */ 1868 __u16 default_stream; 1869 __u16 default_flags; 1870 __u32 default_ppid; 1871 __u32 default_context; 1872 __u32 default_timetolive; 1873 1874 /* Default receive parameters */ 1875 __u32 default_rcv_context; 1876 1877 /* Stream arrays */ 1878 struct sctp_stream stream; 1879 1880 /* All outbound chunks go through this structure. */ 1881 struct sctp_outq outqueue; 1882 1883 /* A smart pipe that will handle reordering and fragmentation, 1884 * as well as handle passing events up to the ULP. 1885 */ 1886 struct sctp_ulpq ulpq; 1887 1888 /* Last TSN that caused an ECNE Chunk to be sent. */ 1889 __u32 last_ecne_tsn; 1890 1891 /* Last TSN that caused a CWR Chunk to be sent. */ 1892 __u32 last_cwr_tsn; 1893 1894 /* How many duplicated TSNs have we seen? */ 1895 int numduptsns; 1896 1897 /* These are to support 1898 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1899 * and Enforcement of Flow and Message Limits" 1900 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1901 * or "ADDIP" for short. 1902 */ 1903 1904 1905 1906 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1907 * 1908 * R1) One and only one ASCONF Chunk MAY be in transit and 1909 * unacknowledged at any one time. If a sender, after sending 1910 * an ASCONF chunk, decides it needs to transfer another 1911 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1912 * returns from the previous ASCONF Chunk before sending a 1913 * subsequent ASCONF. Note this restriction binds each side, 1914 * so at any time two ASCONF may be in-transit on any given 1915 * association (one sent from each endpoint). 1916 * 1917 * [This is our one-and-only-one ASCONF in flight. If we do 1918 * not have an ASCONF in flight, this is NULL.] 1919 */ 1920 struct sctp_chunk *addip_last_asconf; 1921 1922 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1923 * 1924 * This is needed to implement itmes E1 - E4 of the updated 1925 * spec. Here is the justification: 1926 * 1927 * Since the peer may bundle multiple ASCONF chunks toward us, 1928 * we now need the ability to cache multiple ACKs. The section 1929 * describes in detail how they are cached and cleaned up. 1930 */ 1931 struct list_head asconf_ack_list; 1932 1933 /* These ASCONF chunks are waiting to be sent. 1934 * 1935 * These chunaks can't be pushed to outqueue until receiving 1936 * ASCONF_ACK for the previous ASCONF indicated by 1937 * addip_last_asconf, so as to guarantee that only one ASCONF 1938 * is in flight at any time. 1939 * 1940 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1941 * 1942 * In defining the ASCONF Chunk transfer procedures, it is 1943 * essential that these transfers MUST NOT cause congestion 1944 * within the network. To achieve this, we place these 1945 * restrictions on the transfer of ASCONF Chunks: 1946 * 1947 * R1) One and only one ASCONF Chunk MAY be in transit and 1948 * unacknowledged at any one time. If a sender, after sending 1949 * an ASCONF chunk, decides it needs to transfer another 1950 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1951 * returns from the previous ASCONF Chunk before sending a 1952 * subsequent ASCONF. Note this restriction binds each side, 1953 * so at any time two ASCONF may be in-transit on any given 1954 * association (one sent from each endpoint). 1955 * 1956 * 1957 * [I really think this is EXACTLY the sort of intelligence 1958 * which already resides in sctp_outq. Please move this 1959 * queue and its supporting logic down there. --piggy] 1960 */ 1961 struct list_head addip_chunk_list; 1962 1963 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1964 * 1965 * A2) A serial number should be assigned to the Chunk. The 1966 * serial number SHOULD be a monotonically increasing 1967 * number. The serial number SHOULD be initialized at 1968 * the start of the association to the same value as the 1969 * Initial TSN and every time a new ASCONF chunk is created 1970 * it is incremented by one after assigning the serial number 1971 * to the newly created chunk. 1972 * 1973 * ADDIP 1974 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1975 * 1976 * Serial Number : 32 bits (unsigned integer) 1977 * 1978 * This value represents a Serial Number for the ASCONF 1979 * Chunk. The valid range of Serial Number is from 0 to 1980 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1981 * after reaching 4294967295. 1982 */ 1983 __u32 addip_serial; 1984 int src_out_of_asoc_ok; 1985 union sctp_addr *asconf_addr_del_pending; 1986 struct sctp_transport *new_transport; 1987 1988 /* SCTP AUTH: list of the endpoint shared keys. These 1989 * keys are provided out of band by the user applicaton 1990 * and can't change during the lifetime of the association 1991 */ 1992 struct list_head endpoint_shared_keys; 1993 1994 /* SCTP AUTH: 1995 * The current generated assocaition shared key (secret) 1996 */ 1997 struct sctp_auth_bytes *asoc_shared_key; 1998 1999 /* SCTP AUTH: hmac id of the first peer requested algorithm 2000 * that we support. 2001 */ 2002 __u16 default_hmac_id; 2003 2004 __u16 active_key_id; 2005 2006 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 2007 temp:1, /* Is it a temporary association? */ 2008 force_delay:1, 2009 intl_enable:1, 2010 prsctp_enable:1, 2011 reconf_enable:1; 2012 2013 __u8 strreset_enable; 2014 __u8 strreset_outstanding; /* request param count on the fly */ 2015 2016 __u32 strreset_outseq; /* Update after receiving response */ 2017 __u32 strreset_inseq; /* Update after receiving request */ 2018 __u32 strreset_result[2]; /* save the results of last 2 responses */ 2019 2020 struct sctp_chunk *strreset_chunk; /* save request chunk */ 2021 2022 struct sctp_priv_assoc_stats stats; 2023 2024 int sent_cnt_removable; 2025 2026 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 2027 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 2028 }; 2029 2030 2031 /* An eyecatcher for determining if we are really looking at an 2032 * association data structure. 2033 */ 2034 enum { 2035 SCTP_ASSOC_EYECATCHER = 0xa550c123, 2036 }; 2037 2038 /* Recover the outter association structure. */ 2039 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 2040 { 2041 struct sctp_association *asoc; 2042 2043 asoc = container_of(base, struct sctp_association, base); 2044 return asoc; 2045 } 2046 2047 /* These are function signatures for manipulating associations. */ 2048 2049 2050 struct sctp_association * 2051 sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, 2052 enum sctp_scope scope, gfp_t gfp); 2053 void sctp_association_free(struct sctp_association *); 2054 void sctp_association_put(struct sctp_association *); 2055 void sctp_association_hold(struct sctp_association *); 2056 2057 struct sctp_transport *sctp_assoc_choose_alter_transport( 2058 struct sctp_association *, struct sctp_transport *); 2059 void sctp_assoc_update_retran_path(struct sctp_association *); 2060 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 2061 const union sctp_addr *); 2062 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 2063 const union sctp_addr *laddr); 2064 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 2065 const union sctp_addr *address, 2066 const gfp_t gfp, 2067 const int peer_state); 2068 void sctp_assoc_del_peer(struct sctp_association *asoc, 2069 const union sctp_addr *addr); 2070 void sctp_assoc_rm_peer(struct sctp_association *asoc, 2071 struct sctp_transport *peer); 2072 void sctp_assoc_control_transport(struct sctp_association *asoc, 2073 struct sctp_transport *transport, 2074 enum sctp_transport_cmd command, 2075 sctp_sn_error_t error); 2076 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 2077 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 2078 struct net *, 2079 const union sctp_addr *, 2080 const union sctp_addr *); 2081 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 2082 int sctp_assoc_update(struct sctp_association *old, 2083 struct sctp_association *new); 2084 2085 __u32 sctp_association_get_next_tsn(struct sctp_association *); 2086 2087 void sctp_assoc_sync_pmtu(struct sctp_association *asoc); 2088 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 2089 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 2090 void sctp_assoc_set_primary(struct sctp_association *, 2091 struct sctp_transport *); 2092 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 2093 struct sctp_transport *); 2094 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, 2095 enum sctp_scope scope, gfp_t gfp); 2096 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 2097 struct sctp_cookie*, 2098 gfp_t gfp); 2099 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 2100 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 2101 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 2102 const struct sctp_association *asoc, 2103 __be32 serial); 2104 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 2105 2106 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 2107 const union sctp_addr *ss2); 2108 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2109 2110 /* A convenience structure to parse out SCTP specific CMSGs. */ 2111 struct sctp_cmsgs { 2112 struct sctp_initmsg *init; 2113 struct sctp_sndrcvinfo *srinfo; 2114 struct sctp_sndinfo *sinfo; 2115 }; 2116 2117 /* Structure for tracking memory objects */ 2118 struct sctp_dbg_objcnt_entry { 2119 char *label; 2120 atomic_t *counter; 2121 }; 2122 2123 #endif /* __sctp_structs_h__ */ 2124