1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * This SCTP implementation is free software; 10 * you can redistribute it and/or modify it under the terms of 11 * the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This SCTP implementation is distributed in the hope that it 16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 17 * ************************ 18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 19 * See the GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with GNU CC; see the file COPYING. If not, see 23 * <http://www.gnu.org/licenses/>. 24 * 25 * Please send any bug reports or fixes you make to the 26 * email addresses: 27 * lksctp developers <linux-sctp@vger.kernel.org> 28 * 29 * Written or modified by: 30 * Randall Stewart <randall@sctp.chicago.il.us> 31 * Ken Morneau <kmorneau@cisco.com> 32 * Qiaobing Xie <qxie1@email.mot.com> 33 * La Monte H.P. Yarroll <piggy@acm.org> 34 * Karl Knutson <karl@athena.chicago.il.us> 35 * Jon Grimm <jgrimm@us.ibm.com> 36 * Xingang Guo <xingang.guo@intel.com> 37 * Hui Huang <hui.huang@nokia.com> 38 * Sridhar Samudrala <sri@us.ibm.com> 39 * Daisy Chang <daisyc@us.ibm.com> 40 * Dajiang Zhang <dajiang.zhang@nokia.com> 41 * Ardelle Fan <ardelle.fan@intel.com> 42 * Ryan Layer <rmlayer@us.ibm.com> 43 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 44 * Kevin Gao <kevin.gao@intel.com> 45 */ 46 47 #ifndef __sctp_structs_h__ 48 #define __sctp_structs_h__ 49 50 #include <linux/ktime.h> 51 #include <linux/rhashtable.h> 52 #include <linux/socket.h> /* linux/in.h needs this!! */ 53 #include <linux/in.h> /* We get struct sockaddr_in. */ 54 #include <linux/in6.h> /* We get struct in6_addr */ 55 #include <linux/ipv6.h> 56 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 57 #include <linux/atomic.h> /* This gets us atomic counters. */ 58 #include <linux/skbuff.h> /* We need sk_buff_head. */ 59 #include <linux/workqueue.h> /* We need tq_struct. */ 60 #include <linux/sctp.h> /* We need sctp* header structs. */ 61 #include <net/sctp/auth.h> /* We need auth specific structs */ 62 #include <net/ip.h> /* For inet_skb_parm */ 63 64 /* A convenience structure for handling sockaddr structures. 65 * We should wean ourselves off this. 66 */ 67 union sctp_addr { 68 struct sockaddr_in v4; 69 struct sockaddr_in6 v6; 70 struct sockaddr sa; 71 }; 72 73 /* Forward declarations for data structures. */ 74 struct sctp_globals; 75 struct sctp_endpoint; 76 struct sctp_association; 77 struct sctp_transport; 78 struct sctp_packet; 79 struct sctp_chunk; 80 struct sctp_inq; 81 struct sctp_outq; 82 struct sctp_bind_addr; 83 struct sctp_ulpq; 84 struct sctp_ep_common; 85 struct crypto_shash; 86 struct sctp_stream; 87 88 89 #include <net/sctp/tsnmap.h> 90 #include <net/sctp/ulpevent.h> 91 #include <net/sctp/ulpqueue.h> 92 93 /* Structures useful for managing bind/connect. */ 94 95 struct sctp_bind_bucket { 96 unsigned short port; 97 unsigned short fastreuse; 98 struct hlist_node node; 99 struct hlist_head owner; 100 struct net *net; 101 }; 102 103 struct sctp_bind_hashbucket { 104 spinlock_t lock; 105 struct hlist_head chain; 106 }; 107 108 /* Used for hashing all associations. */ 109 struct sctp_hashbucket { 110 rwlock_t lock; 111 struct hlist_head chain; 112 } __attribute__((__aligned__(8))); 113 114 115 /* The SCTP globals structure. */ 116 extern struct sctp_globals { 117 /* This is a list of groups of functions for each address 118 * family that we support. 119 */ 120 struct list_head address_families; 121 122 /* This is the hash of all endpoints. */ 123 struct sctp_hashbucket *ep_hashtable; 124 /* This is the sctp port control hash. */ 125 struct sctp_bind_hashbucket *port_hashtable; 126 /* This is the hash of all transports. */ 127 struct rhltable transport_hashtable; 128 129 /* Sizes of above hashtables. */ 130 int ep_hashsize; 131 int port_hashsize; 132 133 /* Default initialization values to be applied to new associations. */ 134 __u16 max_instreams; 135 __u16 max_outstreams; 136 137 /* Flag to indicate whether computing and verifying checksum 138 * is disabled. */ 139 bool checksum_disable; 140 } sctp_globals; 141 142 #define sctp_max_instreams (sctp_globals.max_instreams) 143 #define sctp_max_outstreams (sctp_globals.max_outstreams) 144 #define sctp_address_families (sctp_globals.address_families) 145 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 146 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 147 #define sctp_port_hashsize (sctp_globals.port_hashsize) 148 #define sctp_port_hashtable (sctp_globals.port_hashtable) 149 #define sctp_transport_hashtable (sctp_globals.transport_hashtable) 150 #define sctp_checksum_disable (sctp_globals.checksum_disable) 151 152 /* SCTP Socket type: UDP or TCP style. */ 153 enum sctp_socket_type { 154 SCTP_SOCKET_UDP = 0, 155 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 156 SCTP_SOCKET_TCP 157 }; 158 159 /* Per socket SCTP information. */ 160 struct sctp_sock { 161 /* inet_sock has to be the first member of sctp_sock */ 162 struct inet_sock inet; 163 /* What kind of a socket is this? */ 164 enum sctp_socket_type type; 165 166 /* PF_ family specific functions. */ 167 struct sctp_pf *pf; 168 169 /* Access to HMAC transform. */ 170 struct crypto_shash *hmac; 171 char *sctp_hmac_alg; 172 173 /* What is our base endpointer? */ 174 struct sctp_endpoint *ep; 175 176 struct sctp_bind_bucket *bind_hash; 177 /* Various Socket Options. */ 178 __u16 default_stream; 179 __u32 default_ppid; 180 __u16 default_flags; 181 __u32 default_context; 182 __u32 default_timetolive; 183 __u32 default_rcv_context; 184 int max_burst; 185 186 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 187 * the destination address every heartbeat interval. This value 188 * will be inherited by all new associations. 189 */ 190 __u32 hbinterval; 191 192 /* This is the max_retrans value for new associations. */ 193 __u16 pathmaxrxt; 194 195 /* The initial Path MTU to use for new associations. */ 196 __u32 pathmtu; 197 198 /* The default SACK delay timeout for new associations. */ 199 __u32 sackdelay; 200 __u32 sackfreq; 201 202 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 203 __u32 param_flags; 204 205 struct sctp_rtoinfo rtoinfo; 206 struct sctp_paddrparams paddrparam; 207 struct sctp_assocparams assocparams; 208 209 /* 210 * These two structures must be grouped together for the usercopy 211 * whitelist region. 212 */ 213 struct sctp_event_subscribe subscribe; 214 struct sctp_initmsg initmsg; 215 216 int user_frag; 217 218 __u32 autoclose; 219 __u32 adaptation_ind; 220 __u32 pd_point; 221 __u16 nodelay:1, 222 disable_fragments:1, 223 v4mapped:1, 224 frag_interleave:1, 225 recvrcvinfo:1, 226 recvnxtinfo:1, 227 data_ready_signalled:1; 228 229 atomic_t pd_mode; 230 /* Receive to here while partial delivery is in effect. */ 231 struct sk_buff_head pd_lobby; 232 233 /* These must be the last fields, as they will skipped on copies, 234 * like on accept and peeloff operations 235 */ 236 struct list_head auto_asconf_list; 237 int do_auto_asconf; 238 }; 239 240 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 241 { 242 return (struct sctp_sock *)sk; 243 } 244 245 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 246 { 247 return (struct sock *)sp; 248 } 249 250 #if IS_ENABLED(CONFIG_IPV6) 251 struct sctp6_sock { 252 struct sctp_sock sctp; 253 struct ipv6_pinfo inet6; 254 }; 255 #endif /* CONFIG_IPV6 */ 256 257 258 /* This is our APPLICATION-SPECIFIC state cookie. 259 * THIS IS NOT DICTATED BY THE SPECIFICATION. 260 */ 261 /* These are the parts of an association which we send in the cookie. 262 * Most of these are straight out of: 263 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 264 * 265 */ 266 267 struct sctp_cookie { 268 269 /* My : Tag expected in every inbound packet and sent 270 * Verification: in the INIT or INIT ACK chunk. 271 * Tag : 272 */ 273 __u32 my_vtag; 274 275 /* Peer's : Tag expected in every outbound packet except 276 * Verification: in the INIT chunk. 277 * Tag : 278 */ 279 __u32 peer_vtag; 280 281 /* The rest of these are not from the spec, but really need to 282 * be in the cookie. 283 */ 284 285 /* My Tie Tag : Assist in discovering a restarting association. */ 286 __u32 my_ttag; 287 288 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 289 __u32 peer_ttag; 290 291 /* When does this cookie expire? */ 292 ktime_t expiration; 293 294 /* Number of inbound/outbound streams which are set 295 * and negotiated during the INIT process. 296 */ 297 __u16 sinit_num_ostreams; 298 __u16 sinit_max_instreams; 299 300 /* This is the first sequence number I used. */ 301 __u32 initial_tsn; 302 303 /* This holds the originating address of the INIT packet. */ 304 union sctp_addr peer_addr; 305 306 /* IG Section 2.35.3 307 * Include the source port of the INIT-ACK 308 */ 309 __u16 my_port; 310 311 __u8 prsctp_capable; 312 313 /* Padding for future use */ 314 __u8 padding; 315 316 __u32 adaptation_ind; 317 318 __u8 auth_random[sizeof(struct sctp_paramhdr) + 319 SCTP_AUTH_RANDOM_LENGTH]; 320 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 321 __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; 322 323 /* This is a shim for my peer's INIT packet, followed by 324 * a copy of the raw address list of the association. 325 * The length of the raw address list is saved in the 326 * raw_addr_list_len field, which will be used at the time when 327 * the association TCB is re-constructed from the cookie. 328 */ 329 __u32 raw_addr_list_len; 330 struct sctp_init_chunk peer_init[0]; 331 }; 332 333 334 /* The format of our cookie that we send to our peer. */ 335 struct sctp_signed_cookie { 336 __u8 signature[SCTP_SECRET_SIZE]; 337 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 338 struct sctp_cookie c; 339 } __packed; 340 341 /* This is another convenience type to allocate memory for address 342 * params for the maximum size and pass such structures around 343 * internally. 344 */ 345 union sctp_addr_param { 346 struct sctp_paramhdr p; 347 struct sctp_ipv4addr_param v4; 348 struct sctp_ipv6addr_param v6; 349 }; 350 351 /* A convenience type to allow walking through the various 352 * parameters and avoid casting all over the place. 353 */ 354 union sctp_params { 355 void *v; 356 struct sctp_paramhdr *p; 357 struct sctp_cookie_preserve_param *life; 358 struct sctp_hostname_param *dns; 359 struct sctp_cookie_param *cookie; 360 struct sctp_supported_addrs_param *sat; 361 struct sctp_ipv4addr_param *v4; 362 struct sctp_ipv6addr_param *v6; 363 union sctp_addr_param *addr; 364 struct sctp_adaptation_ind_param *aind; 365 struct sctp_supported_ext_param *ext; 366 struct sctp_random_param *random; 367 struct sctp_chunks_param *chunks; 368 struct sctp_hmac_algo_param *hmac_algo; 369 struct sctp_addip_param *addip; 370 }; 371 372 /* RFC 2960. Section 3.3.5 Heartbeat. 373 * Heartbeat Information: variable length 374 * The Sender-specific Heartbeat Info field should normally include 375 * information about the sender's current time when this HEARTBEAT 376 * chunk is sent and the destination transport address to which this 377 * HEARTBEAT is sent (see Section 8.3). 378 */ 379 struct sctp_sender_hb_info { 380 struct sctp_paramhdr param_hdr; 381 union sctp_addr daddr; 382 unsigned long sent_at; 383 __u64 hb_nonce; 384 }; 385 386 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 387 gfp_t gfp); 388 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid); 389 void sctp_stream_free(struct sctp_stream *stream); 390 void sctp_stream_clear(struct sctp_stream *stream); 391 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); 392 393 /* What is the current SSN number for this stream? */ 394 #define sctp_ssn_peek(stream, type, sid) \ 395 ((stream)->type[sid].ssn) 396 397 /* Return the next SSN number for this stream. */ 398 #define sctp_ssn_next(stream, type, sid) \ 399 ((stream)->type[sid].ssn++) 400 401 /* Skip over this ssn and all below. */ 402 #define sctp_ssn_skip(stream, type, sid, ssn) \ 403 ((stream)->type[sid].ssn = ssn + 1) 404 405 /* 406 * Pointers to address related SCTP functions. 407 * (i.e. things that depend on the address family.) 408 */ 409 struct sctp_af { 410 int (*sctp_xmit) (struct sk_buff *skb, 411 struct sctp_transport *); 412 int (*setsockopt) (struct sock *sk, 413 int level, 414 int optname, 415 char __user *optval, 416 unsigned int optlen); 417 int (*getsockopt) (struct sock *sk, 418 int level, 419 int optname, 420 char __user *optval, 421 int __user *optlen); 422 int (*compat_setsockopt) (struct sock *sk, 423 int level, 424 int optname, 425 char __user *optval, 426 unsigned int optlen); 427 int (*compat_getsockopt) (struct sock *sk, 428 int level, 429 int optname, 430 char __user *optval, 431 int __user *optlen); 432 void (*get_dst) (struct sctp_transport *t, 433 union sctp_addr *saddr, 434 struct flowi *fl, 435 struct sock *sk); 436 void (*get_saddr) (struct sctp_sock *sk, 437 struct sctp_transport *t, 438 struct flowi *fl); 439 void (*copy_addrlist) (struct list_head *, 440 struct net_device *); 441 int (*cmp_addr) (const union sctp_addr *addr1, 442 const union sctp_addr *addr2); 443 void (*addr_copy) (union sctp_addr *dst, 444 union sctp_addr *src); 445 void (*from_skb) (union sctp_addr *, 446 struct sk_buff *skb, 447 int saddr); 448 void (*from_sk) (union sctp_addr *, 449 struct sock *sk); 450 void (*from_addr_param) (union sctp_addr *, 451 union sctp_addr_param *, 452 __be16 port, int iif); 453 int (*to_addr_param) (const union sctp_addr *, 454 union sctp_addr_param *); 455 int (*addr_valid) (union sctp_addr *, 456 struct sctp_sock *, 457 const struct sk_buff *); 458 enum sctp_scope (*scope)(union sctp_addr *); 459 void (*inaddr_any) (union sctp_addr *, __be16); 460 int (*is_any) (const union sctp_addr *); 461 int (*available) (union sctp_addr *, 462 struct sctp_sock *); 463 int (*skb_iif) (const struct sk_buff *sk); 464 int (*is_ce) (const struct sk_buff *sk); 465 void (*seq_dump_addr)(struct seq_file *seq, 466 union sctp_addr *addr); 467 void (*ecn_capable)(struct sock *sk); 468 __u16 net_header_len; 469 int sockaddr_len; 470 sa_family_t sa_family; 471 struct list_head list; 472 }; 473 474 struct sctp_af *sctp_get_af_specific(sa_family_t); 475 int sctp_register_af(struct sctp_af *); 476 477 /* Protocol family functions. */ 478 struct sctp_pf { 479 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 480 void (*skb_msgname) (struct sk_buff *, char *, int *); 481 int (*af_supported) (sa_family_t, struct sctp_sock *); 482 int (*cmp_addr) (const union sctp_addr *, 483 const union sctp_addr *, 484 struct sctp_sock *); 485 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 486 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 487 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 488 struct sock *(*create_accept_sk) (struct sock *sk, 489 struct sctp_association *asoc, 490 bool kern); 491 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 492 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 493 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 494 struct sctp_af *af; 495 }; 496 497 498 /* Structure to track chunk fragments that have been acked, but peer 499 * fragments of the same message have not. 500 */ 501 struct sctp_datamsg { 502 /* Chunks waiting to be submitted to lower layer. */ 503 struct list_head chunks; 504 /* Reference counting. */ 505 refcount_t refcnt; 506 /* When is this message no longer interesting to the peer? */ 507 unsigned long expires_at; 508 /* Did the messenge fail to send? */ 509 int send_error; 510 u8 send_failed:1, 511 can_delay; /* should this message be Nagle delayed */ 512 }; 513 514 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 515 struct sctp_sndrcvinfo *, 516 struct iov_iter *); 517 void sctp_datamsg_free(struct sctp_datamsg *); 518 void sctp_datamsg_put(struct sctp_datamsg *); 519 void sctp_chunk_fail(struct sctp_chunk *, int error); 520 int sctp_chunk_abandoned(struct sctp_chunk *); 521 522 /* RFC2960 1.4 Key Terms 523 * 524 * o Chunk: A unit of information within an SCTP packet, consisting of 525 * a chunk header and chunk-specific content. 526 * 527 * As a matter of convenience, we remember the SCTP common header for 528 * each chunk as well as a few other header pointers... 529 */ 530 struct sctp_chunk { 531 struct list_head list; 532 533 refcount_t refcnt; 534 535 /* How many times this chunk have been sent, for prsctp RTX policy */ 536 int sent_count; 537 538 union { 539 /* This is our link to the per-transport transmitted list. */ 540 struct list_head transmitted_list; 541 /* List in specific stream outq */ 542 struct list_head stream_list; 543 }; 544 545 /* This field is used by chunks that hold fragmented data. 546 * For the first fragment this is the list that holds the rest of 547 * fragments. For the remaining fragments, this is the link to the 548 * frag_list maintained in the first fragment. 549 */ 550 struct list_head frag_list; 551 552 /* This points to the sk_buff containing the actual data. */ 553 struct sk_buff *skb; 554 555 /* In case of GSO packets, this will store the head one */ 556 struct sk_buff *head_skb; 557 558 /* These are the SCTP headers by reverse order in a packet. 559 * Note that some of these may happen more than once. In that 560 * case, we point at the "current" one, whatever that means 561 * for that level of header. 562 */ 563 564 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 565 union sctp_params param_hdr; 566 union { 567 __u8 *v; 568 struct sctp_datahdr *data_hdr; 569 struct sctp_inithdr *init_hdr; 570 struct sctp_sackhdr *sack_hdr; 571 struct sctp_heartbeathdr *hb_hdr; 572 struct sctp_sender_hb_info *hbs_hdr; 573 struct sctp_shutdownhdr *shutdown_hdr; 574 struct sctp_signed_cookie *cookie_hdr; 575 struct sctp_ecnehdr *ecne_hdr; 576 struct sctp_cwrhdr *ecn_cwr_hdr; 577 struct sctp_errhdr *err_hdr; 578 struct sctp_addiphdr *addip_hdr; 579 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 580 struct sctp_authhdr *auth_hdr; 581 } subh; 582 583 __u8 *chunk_end; 584 585 struct sctp_chunkhdr *chunk_hdr; 586 struct sctphdr *sctp_hdr; 587 588 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 589 struct sctp_sndrcvinfo sinfo; 590 591 /* Which association does this belong to? */ 592 struct sctp_association *asoc; 593 594 /* What endpoint received this chunk? */ 595 struct sctp_ep_common *rcvr; 596 597 /* We fill this in if we are calculating RTT. */ 598 unsigned long sent_at; 599 600 /* What is the origin IP address for this chunk? */ 601 union sctp_addr source; 602 /* Destination address for this chunk. */ 603 union sctp_addr dest; 604 605 /* For outbound message, track all fragments for SEND_FAILED. */ 606 struct sctp_datamsg *msg; 607 608 /* For an inbound chunk, this tells us where it came from. 609 * For an outbound chunk, it tells us where we'd like it to 610 * go. It is NULL if we have no preference. 611 */ 612 struct sctp_transport *transport; 613 614 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 615 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 616 * spec violates the principle premis that all chunks are processed 617 * in order. 618 */ 619 struct sk_buff *auth_chunk; 620 621 #define SCTP_CAN_FRTX 0x0 622 #define SCTP_NEED_FRTX 0x1 623 #define SCTP_DONT_FRTX 0x2 624 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 625 has_tsn:1, /* Does this chunk have a TSN yet? */ 626 has_ssn:1, /* Does this chunk have a SSN yet? */ 627 singleton:1, /* Only chunk in the packet? */ 628 end_of_packet:1, /* Last chunk in the packet? */ 629 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 630 pdiscard:1, /* Discard the whole packet now? */ 631 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 632 data_accepted:1, /* At least 1 chunk accepted */ 633 auth:1, /* IN: was auth'ed | OUT: needs auth */ 634 has_asconf:1, /* IN: have seen an asconf before */ 635 tsn_missing_report:2, /* Data chunk missing counter. */ 636 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 637 }; 638 639 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 640 void sctp_chunk_hold(struct sctp_chunk *); 641 void sctp_chunk_put(struct sctp_chunk *); 642 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 643 struct iov_iter *from); 644 void sctp_chunk_free(struct sctp_chunk *); 645 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 646 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 647 const struct sctp_association *, 648 struct sock *, gfp_t gfp); 649 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 650 union sctp_addr *); 651 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 652 653 static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) 654 { 655 return ntohs(ch->subh.data_hdr->stream); 656 } 657 658 enum { 659 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 660 SCTP_ADDR_SRC, /* address can be used as source */ 661 SCTP_ADDR_DEL, /* address about to be deleted */ 662 }; 663 664 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 665 struct sctp_sockaddr_entry { 666 struct list_head list; 667 struct rcu_head rcu; 668 union sctp_addr a; 669 __u8 state; 670 __u8 valid; 671 }; 672 673 #define SCTP_ADDRESS_TICK_DELAY 500 674 675 /* This structure holds lists of chunks as we are assembling for 676 * transmission. 677 */ 678 struct sctp_packet { 679 /* These are the SCTP header values (host order) for the packet. */ 680 __u16 source_port; 681 __u16 destination_port; 682 __u32 vtag; 683 684 /* This contains the payload chunks. */ 685 struct list_head chunk_list; 686 687 /* This is the overhead of the sctp and ip headers. */ 688 size_t overhead; 689 /* This is the total size of all chunks INCLUDING padding. */ 690 size_t size; 691 /* This is the maximum size this packet may have */ 692 size_t max_size; 693 694 /* The packet is destined for this transport address. 695 * The function we finally use to pass down to the next lower 696 * layer lives in the transport structure. 697 */ 698 struct sctp_transport *transport; 699 700 /* pointer to the auth chunk for this packet */ 701 struct sctp_chunk *auth; 702 703 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 704 has_sack:1, /* This packet contains a SACK chunk. */ 705 has_auth:1, /* This packet contains an AUTH chunk */ 706 has_data:1, /* This packet contains at least 1 DATA chunk */ 707 ipfragok:1; /* So let ip fragment this packet */ 708 }; 709 710 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 711 __u16 sport, __u16 dport); 712 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 713 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, 714 struct sctp_chunk *chunk, 715 int one_packet, gfp_t gfp); 716 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, 717 struct sctp_chunk *chunk); 718 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 719 void sctp_packet_free(struct sctp_packet *); 720 721 static inline int sctp_packet_empty(struct sctp_packet *packet) 722 { 723 return packet->size == packet->overhead; 724 } 725 726 /* This represents a remote transport address. 727 * For local transport addresses, we just use union sctp_addr. 728 * 729 * RFC2960 Section 1.4 Key Terms 730 * 731 * o Transport address: A Transport Address is traditionally defined 732 * by Network Layer address, Transport Layer protocol and Transport 733 * Layer port number. In the case of SCTP running over IP, a 734 * transport address is defined by the combination of an IP address 735 * and an SCTP port number (where SCTP is the Transport protocol). 736 * 737 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 738 * 739 * o The sender keeps a separate congestion control parameter set for 740 * each of the destination addresses it can send to (not each 741 * source-destination pair but for each destination). The parameters 742 * should decay if the address is not used for a long enough time 743 * period. 744 * 745 */ 746 struct sctp_transport { 747 /* A list of transports. */ 748 struct list_head transports; 749 struct rhlist_head node; 750 751 /* Reference counting. */ 752 refcount_t refcnt; 753 /* RTO-Pending : A flag used to track if one of the DATA 754 * chunks sent to this address is currently being 755 * used to compute a RTT. If this flag is 0, 756 * the next DATA chunk sent to this destination 757 * should be used to compute a RTT and this flag 758 * should be set. Every time the RTT 759 * calculation completes (i.e. the DATA chunk 760 * is SACK'd) clear this flag. 761 */ 762 __u32 rto_pending:1, 763 764 /* 765 * hb_sent : a flag that signals that we have a pending 766 * heartbeat. 767 */ 768 hb_sent:1, 769 770 /* Is the Path MTU update pending on this tranport */ 771 pmtu_pending:1, 772 773 dst_pending_confirm:1, /* need to confirm neighbour */ 774 775 /* Has this transport moved the ctsn since we last sacked */ 776 sack_generation:1; 777 u32 dst_cookie; 778 779 struct flowi fl; 780 781 /* This is the peer's IP address and port. */ 782 union sctp_addr ipaddr; 783 784 /* These are the functions we call to handle LLP stuff. */ 785 struct sctp_af *af_specific; 786 787 /* Which association do we belong to? */ 788 struct sctp_association *asoc; 789 790 /* RFC2960 791 * 792 * 12.3 Per Transport Address Data 793 * 794 * For each destination transport address in the peer's 795 * address list derived from the INIT or INIT ACK chunk, a 796 * number of data elements needs to be maintained including: 797 */ 798 /* RTO : The current retransmission timeout value. */ 799 unsigned long rto; 800 801 __u32 rtt; /* This is the most recent RTT. */ 802 803 /* RTTVAR : The current RTT variation. */ 804 __u32 rttvar; 805 806 /* SRTT : The current smoothed round trip time. */ 807 __u32 srtt; 808 809 /* 810 * These are the congestion stats. 811 */ 812 /* cwnd : The current congestion window. */ 813 __u32 cwnd; /* This is the actual cwnd. */ 814 815 /* ssthresh : The current slow start threshold value. */ 816 __u32 ssthresh; 817 818 /* partial : The tracking method for increase of cwnd when in 819 * bytes acked : congestion avoidance mode (see Section 6.2.2) 820 */ 821 __u32 partial_bytes_acked; 822 823 /* Data that has been sent, but not acknowledged. */ 824 __u32 flight_size; 825 826 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 827 828 /* Destination */ 829 struct dst_entry *dst; 830 /* Source address. */ 831 union sctp_addr saddr; 832 833 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 834 * the destination address every heartbeat interval. 835 */ 836 unsigned long hbinterval; 837 838 /* SACK delay timeout */ 839 unsigned long sackdelay; 840 __u32 sackfreq; 841 842 /* When was the last time that we heard from this transport? We use 843 * this to pick new active and retran paths. 844 */ 845 ktime_t last_time_heard; 846 847 /* When was the last time that we sent a chunk using this 848 * transport? We use this to check for idle transports 849 */ 850 unsigned long last_time_sent; 851 852 /* Last time(in jiffies) when cwnd is reduced due to the congestion 853 * indication based on ECNE chunk. 854 */ 855 unsigned long last_time_ecne_reduced; 856 857 /* This is the max_retrans value for the transport and will 858 * be initialized from the assocs value. This can be changed 859 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 860 */ 861 __u16 pathmaxrxt; 862 863 /* This is the partially failed retrans value for the transport 864 * and will be initialized from the assocs value. This can be changed 865 * using the SCTP_PEER_ADDR_THLDS socket option 866 */ 867 int pf_retrans; 868 /* PMTU : The current known path MTU. */ 869 __u32 pathmtu; 870 871 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 872 __u32 param_flags; 873 874 /* The number of times INIT has been sent on this transport. */ 875 int init_sent_count; 876 877 /* state : The current state of this destination, 878 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 879 */ 880 int state; 881 882 /* These are the error stats for this destination. */ 883 884 /* Error count : The current error count for this destination. */ 885 unsigned short error_count; 886 887 /* Per : A timer used by each destination. 888 * Destination : 889 * Timer : 890 * 891 * [Everywhere else in the text this is called T3-rtx. -ed] 892 */ 893 struct timer_list T3_rtx_timer; 894 895 /* Heartbeat timer is per destination. */ 896 struct timer_list hb_timer; 897 898 /* Timer to handle ICMP proto unreachable envets */ 899 struct timer_list proto_unreach_timer; 900 901 /* Timer to handler reconf chunk rtx */ 902 struct timer_list reconf_timer; 903 904 /* Since we're using per-destination retransmission timers 905 * (see above), we're also using per-destination "transmitted" 906 * queues. This probably ought to be a private struct 907 * accessible only within the outqueue, but it's not, yet. 908 */ 909 struct list_head transmitted; 910 911 /* We build bundle-able packets for this transport here. */ 912 struct sctp_packet packet; 913 914 /* This is the list of transports that have chunks to send. */ 915 struct list_head send_ready; 916 917 /* State information saved for SFR_CACC algorithm. The key 918 * idea in SFR_CACC is to maintain state at the sender on a 919 * per-destination basis when a changeover happens. 920 * char changeover_active; 921 * char cycling_changeover; 922 * __u32 next_tsn_at_change; 923 * char cacc_saw_newack; 924 */ 925 struct { 926 /* An unsigned integer, which stores the next TSN to be 927 * used by the sender, at the moment of changeover. 928 */ 929 __u32 next_tsn_at_change; 930 931 /* A flag which indicates the occurrence of a changeover */ 932 char changeover_active; 933 934 /* A flag which indicates whether the change of primary is 935 * the first switch to this destination address during an 936 * active switch. 937 */ 938 char cycling_changeover; 939 940 /* A temporary flag, which is used during the processing of 941 * a SACK to estimate the causative TSN(s)'s group. 942 */ 943 char cacc_saw_newack; 944 } cacc; 945 946 /* 64-bit random number sent with heartbeat. */ 947 __u64 hb_nonce; 948 949 struct rcu_head rcu; 950 }; 951 952 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 953 gfp_t); 954 void sctp_transport_set_owner(struct sctp_transport *, 955 struct sctp_association *); 956 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 957 struct sctp_sock *); 958 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 959 void sctp_transport_free(struct sctp_transport *); 960 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 961 void sctp_transport_reset_hb_timer(struct sctp_transport *); 962 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 963 int sctp_transport_hold(struct sctp_transport *); 964 void sctp_transport_put(struct sctp_transport *); 965 void sctp_transport_update_rto(struct sctp_transport *, __u32); 966 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 967 void sctp_transport_lower_cwnd(struct sctp_transport *t, 968 enum sctp_lower_cwnd reason); 969 void sctp_transport_burst_limited(struct sctp_transport *); 970 void sctp_transport_burst_reset(struct sctp_transport *); 971 unsigned long sctp_transport_timeout(struct sctp_transport *); 972 void sctp_transport_reset(struct sctp_transport *t); 973 void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); 974 void sctp_transport_immediate_rtx(struct sctp_transport *); 975 void sctp_transport_dst_release(struct sctp_transport *t); 976 void sctp_transport_dst_confirm(struct sctp_transport *t); 977 978 979 /* This is the structure we use to queue packets as they come into 980 * SCTP. We write packets to it and read chunks from it. 981 */ 982 struct sctp_inq { 983 /* This is actually a queue of sctp_chunk each 984 * containing a partially decoded packet. 985 */ 986 struct list_head in_chunk_list; 987 /* This is the packet which is currently off the in queue and is 988 * being worked on through the inbound chunk processing. 989 */ 990 struct sctp_chunk *in_progress; 991 992 /* This is the delayed task to finish delivering inbound 993 * messages. 994 */ 995 struct work_struct immediate; 996 }; 997 998 void sctp_inq_init(struct sctp_inq *); 999 void sctp_inq_free(struct sctp_inq *); 1000 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1001 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1002 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1003 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1004 1005 /* This is the structure we use to hold outbound chunks. You push 1006 * chunks in and they automatically pop out the other end as bundled 1007 * packets (it calls (*output_handler)()). 1008 * 1009 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1010 * and 8.2 of the v13 draft. 1011 * 1012 * It handles retransmissions. The connection to the timeout portion 1013 * of the state machine is through sctp_..._timeout() and timeout_handler. 1014 * 1015 * If you feed it SACKs, it will eat them. 1016 * 1017 * If you give it big chunks, it will fragment them. 1018 * 1019 * It assigns TSN's to data chunks. This happens at the last possible 1020 * instant before transmission. 1021 * 1022 * When free()'d, it empties itself out via output_handler(). 1023 */ 1024 struct sctp_outq { 1025 struct sctp_association *asoc; 1026 1027 /* Data pending that has never been transmitted. */ 1028 struct list_head out_chunk_list; 1029 1030 /* Stream scheduler being used */ 1031 struct sctp_sched_ops *sched; 1032 1033 unsigned int out_qlen; /* Total length of queued data chunks. */ 1034 1035 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1036 unsigned int error; 1037 1038 /* These are control chunks we want to send. */ 1039 struct list_head control_chunk_list; 1040 1041 /* These are chunks that have been sacked but are above the 1042 * CTSN, or cumulative tsn ack point. 1043 */ 1044 struct list_head sacked; 1045 1046 /* Put chunks on this list to schedule them for 1047 * retransmission. 1048 */ 1049 struct list_head retransmit; 1050 1051 /* Put chunks on this list to save them for FWD TSN processing as 1052 * they were abandoned. 1053 */ 1054 struct list_head abandoned; 1055 1056 /* How many unackd bytes do we have in-flight? */ 1057 __u32 outstanding_bytes; 1058 1059 /* Are we doing fast-rtx on this queue */ 1060 char fast_rtx; 1061 1062 /* Corked? */ 1063 char cork; 1064 }; 1065 1066 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1067 void sctp_outq_teardown(struct sctp_outq *); 1068 void sctp_outq_free(struct sctp_outq*); 1069 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1070 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1071 int sctp_outq_is_empty(const struct sctp_outq *); 1072 void sctp_outq_restart(struct sctp_outq *); 1073 1074 void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, 1075 enum sctp_retransmit_reason reason); 1076 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1077 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1078 void sctp_prsctp_prune(struct sctp_association *asoc, 1079 struct sctp_sndrcvinfo *sinfo, int msg_len); 1080 /* Uncork and flush an outqueue. */ 1081 static inline void sctp_outq_cork(struct sctp_outq *q) 1082 { 1083 q->cork = 1; 1084 } 1085 1086 /* SCTP skb control block. 1087 * sctp_input_cb is currently used on rx and sock rx queue 1088 */ 1089 struct sctp_input_cb { 1090 union { 1091 struct inet_skb_parm h4; 1092 #if IS_ENABLED(CONFIG_IPV6) 1093 struct inet6_skb_parm h6; 1094 #endif 1095 } header; 1096 struct sctp_chunk *chunk; 1097 struct sctp_af *af; 1098 }; 1099 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1100 1101 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1102 { 1103 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1104 1105 return chunk->head_skb ? : skb; 1106 } 1107 1108 /* These bind address data fields common between endpoints and associations */ 1109 struct sctp_bind_addr { 1110 1111 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1112 * 1113 * SCTP Port: The local SCTP port number the endpoint is 1114 * bound to. 1115 */ 1116 __u16 port; 1117 1118 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1119 * 1120 * Address List: The list of IP addresses that this instance 1121 * has bound. This information is passed to one's 1122 * peer(s) in INIT and INIT ACK chunks. 1123 */ 1124 struct list_head address_list; 1125 }; 1126 1127 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1128 void sctp_bind_addr_free(struct sctp_bind_addr *); 1129 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1130 const struct sctp_bind_addr *src, 1131 enum sctp_scope scope, gfp_t gfp, 1132 int flags); 1133 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1134 const struct sctp_bind_addr *src, 1135 gfp_t gfp); 1136 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1137 int new_size, __u8 addr_state, gfp_t gfp); 1138 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1139 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1140 struct sctp_sock *); 1141 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1142 struct sctp_sock *, struct sctp_sock *); 1143 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1144 const union sctp_addr *addr); 1145 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1146 const union sctp_addr *addrs, 1147 int addrcnt, 1148 struct sctp_sock *opt); 1149 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1150 int *addrs_len, 1151 gfp_t gfp); 1152 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1153 __u16 port, gfp_t gfp); 1154 1155 enum sctp_scope sctp_scope(const union sctp_addr *addr); 1156 int sctp_in_scope(struct net *net, const union sctp_addr *addr, 1157 const enum sctp_scope scope); 1158 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1159 int sctp_is_ep_boundall(struct sock *sk); 1160 1161 1162 /* What type of endpoint? */ 1163 enum sctp_endpoint_type { 1164 SCTP_EP_TYPE_SOCKET, 1165 SCTP_EP_TYPE_ASSOCIATION, 1166 }; 1167 1168 /* 1169 * A common base class to bridge the implmentation view of a 1170 * socket (usually listening) endpoint versus an association's 1171 * local endpoint. 1172 * This common structure is useful for several purposes: 1173 * 1) Common interface for lookup routines. 1174 * a) Subfunctions work for either endpoint or association 1175 * b) Single interface to lookup allows hiding the lookup lock rather 1176 * than acquiring it externally. 1177 * 2) Common interface for the inbound chunk handling/state machine. 1178 * 3) Common object handling routines for reference counting, etc. 1179 * 4) Disentangle association lookup from endpoint lookup, where we 1180 * do not have to find our endpoint to find our association. 1181 * 1182 */ 1183 1184 struct sctp_ep_common { 1185 /* Fields to help us manage our entries in the hash tables. */ 1186 struct hlist_node node; 1187 int hashent; 1188 1189 /* Runtime type information. What kind of endpoint is this? */ 1190 enum sctp_endpoint_type type; 1191 1192 /* Some fields to help us manage this object. 1193 * refcnt - Reference count access to this object. 1194 * dead - Do not attempt to use this object. 1195 */ 1196 refcount_t refcnt; 1197 bool dead; 1198 1199 /* What socket does this endpoint belong to? */ 1200 struct sock *sk; 1201 1202 /* This is where we receive inbound chunks. */ 1203 struct sctp_inq inqueue; 1204 1205 /* This substructure includes the defining parameters of the 1206 * endpoint: 1207 * bind_addr.port is our shared port number. 1208 * bind_addr.address_list is our set of local IP addresses. 1209 */ 1210 struct sctp_bind_addr bind_addr; 1211 }; 1212 1213 1214 /* RFC Section 1.4 Key Terms 1215 * 1216 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1217 * multi-homed host, an SCTP endpoint is represented to its peers as a 1218 * combination of a set of eligible destination transport addresses to 1219 * which SCTP packets can be sent and a set of eligible source 1220 * transport addresses from which SCTP packets can be received. 1221 * All transport addresses used by an SCTP endpoint must use the 1222 * same port number, but can use multiple IP addresses. A transport 1223 * address used by an SCTP endpoint must not be used by another 1224 * SCTP endpoint. In other words, a transport address is unique 1225 * to an SCTP endpoint. 1226 * 1227 * From an implementation perspective, each socket has one of these. 1228 * A TCP-style socket will have exactly one association on one of 1229 * these. An UDP-style socket will have multiple associations hanging 1230 * off one of these. 1231 */ 1232 1233 struct sctp_endpoint { 1234 /* Common substructure for endpoint and association. */ 1235 struct sctp_ep_common base; 1236 1237 /* Associations: A list of current associations and mappings 1238 * to the data consumers for each association. This 1239 * may be in the form of a hash table or other 1240 * implementation dependent structure. The data 1241 * consumers may be process identification 1242 * information such as file descriptors, named pipe 1243 * pointer, or table pointers dependent on how SCTP 1244 * is implemented. 1245 */ 1246 /* This is really a list of struct sctp_association entries. */ 1247 struct list_head asocs; 1248 1249 /* Secret Key: A secret key used by this endpoint to compute 1250 * the MAC. This SHOULD be a cryptographic quality 1251 * random number with a sufficient length. 1252 * Discussion in [RFC1750] can be helpful in 1253 * selection of the key. 1254 */ 1255 __u8 secret_key[SCTP_SECRET_SIZE]; 1256 1257 /* digest: This is a digest of the sctp cookie. This field is 1258 * only used on the receive path when we try to validate 1259 * that the cookie has not been tampered with. We put 1260 * this here so we pre-allocate this once and can re-use 1261 * on every receive. 1262 */ 1263 __u8 *digest; 1264 1265 /* sendbuf acct. policy. */ 1266 __u32 sndbuf_policy; 1267 1268 /* rcvbuf acct. policy. */ 1269 __u32 rcvbuf_policy; 1270 1271 /* SCTP AUTH: array of the HMACs that will be allocated 1272 * we need this per association so that we don't serialize 1273 */ 1274 struct crypto_shash **auth_hmacs; 1275 1276 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1277 struct sctp_hmac_algo_param *auth_hmacs_list; 1278 1279 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1280 struct sctp_chunks_param *auth_chunk_list; 1281 1282 /* SCTP-AUTH: endpoint shared keys */ 1283 struct list_head endpoint_shared_keys; 1284 __u16 active_key_id; 1285 __u8 auth_enable:1, 1286 prsctp_enable:1, 1287 reconf_enable:1; 1288 1289 __u8 strreset_enable; 1290 }; 1291 1292 /* Recover the outter endpoint structure. */ 1293 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1294 { 1295 struct sctp_endpoint *ep; 1296 1297 ep = container_of(base, struct sctp_endpoint, base); 1298 return ep; 1299 } 1300 1301 /* These are function signatures for manipulating endpoints. */ 1302 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1303 void sctp_endpoint_free(struct sctp_endpoint *); 1304 void sctp_endpoint_put(struct sctp_endpoint *); 1305 void sctp_endpoint_hold(struct sctp_endpoint *); 1306 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1307 struct sctp_association *sctp_endpoint_lookup_assoc( 1308 const struct sctp_endpoint *ep, 1309 const union sctp_addr *paddr, 1310 struct sctp_transport **); 1311 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1312 const union sctp_addr *); 1313 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1314 struct net *, const union sctp_addr *); 1315 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1316 const union sctp_addr *paddr); 1317 1318 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1319 const struct sctp_association *asoc, 1320 enum sctp_cid cid, struct sctp_init_chunk *peer_init, 1321 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1322 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1323 const union sctp_addr *peer, 1324 struct sctp_init_chunk *init, gfp_t gfp); 1325 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1326 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1327 1328 struct sctp_inithdr_host { 1329 __u32 init_tag; 1330 __u32 a_rwnd; 1331 __u16 num_outbound_streams; 1332 __u16 num_inbound_streams; 1333 __u32 initial_tsn; 1334 }; 1335 1336 struct sctp_stream_priorities { 1337 /* List of priorities scheduled */ 1338 struct list_head prio_sched; 1339 /* List of streams scheduled */ 1340 struct list_head active; 1341 /* The next stream stream in line */ 1342 struct sctp_stream_out_ext *next; 1343 __u16 prio; 1344 }; 1345 1346 struct sctp_stream_out_ext { 1347 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1348 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1349 struct list_head outq; /* chunks enqueued by this stream */ 1350 union { 1351 struct { 1352 /* Scheduled streams list */ 1353 struct list_head prio_list; 1354 struct sctp_stream_priorities *prio_head; 1355 }; 1356 /* Fields used by RR scheduler */ 1357 struct { 1358 struct list_head rr_list; 1359 }; 1360 }; 1361 }; 1362 1363 struct sctp_stream_out { 1364 __u16 ssn; 1365 __u8 state; 1366 struct sctp_stream_out_ext *ext; 1367 }; 1368 1369 struct sctp_stream_in { 1370 __u16 ssn; 1371 }; 1372 1373 struct sctp_stream { 1374 struct sctp_stream_out *out; 1375 struct sctp_stream_in *in; 1376 __u16 outcnt; 1377 __u16 incnt; 1378 /* Current stream being sent, if any */ 1379 struct sctp_stream_out *out_curr; 1380 union { 1381 /* Fields used by priority scheduler */ 1382 struct { 1383 /* List of priorities scheduled */ 1384 struct list_head prio_list; 1385 }; 1386 /* Fields used by RR scheduler */ 1387 struct { 1388 /* List of streams scheduled */ 1389 struct list_head rr_list; 1390 /* The next stream stream in line */ 1391 struct sctp_stream_out_ext *rr_next; 1392 }; 1393 }; 1394 }; 1395 1396 #define SCTP_STREAM_CLOSED 0x00 1397 #define SCTP_STREAM_OPEN 0x01 1398 1399 /* SCTP_GET_ASSOC_STATS counters */ 1400 struct sctp_priv_assoc_stats { 1401 /* Maximum observed rto in the association during subsequent 1402 * observations. Value is set to 0 if no RTO measurement took place 1403 * The transport where the max_rto was observed is returned in 1404 * obs_rto_ipaddr 1405 */ 1406 struct sockaddr_storage obs_rto_ipaddr; 1407 __u64 max_obs_rto; 1408 /* Total In and Out SACKs received and sent */ 1409 __u64 isacks; 1410 __u64 osacks; 1411 /* Total In and Out packets received and sent */ 1412 __u64 opackets; 1413 __u64 ipackets; 1414 /* Total retransmitted chunks */ 1415 __u64 rtxchunks; 1416 /* TSN received > next expected */ 1417 __u64 outofseqtsns; 1418 /* Duplicate Chunks received */ 1419 __u64 idupchunks; 1420 /* Gap Ack Blocks received */ 1421 __u64 gapcnt; 1422 /* Unordered data chunks sent and received */ 1423 __u64 ouodchunks; 1424 __u64 iuodchunks; 1425 /* Ordered data chunks sent and received */ 1426 __u64 oodchunks; 1427 __u64 iodchunks; 1428 /* Control chunks sent and received */ 1429 __u64 octrlchunks; 1430 __u64 ictrlchunks; 1431 }; 1432 1433 /* RFC2960 1434 * 1435 * 12. Recommended Transmission Control Block (TCB) Parameters 1436 * 1437 * This section details a recommended set of parameters that should 1438 * be contained within the TCB for an implementation. This section is 1439 * for illustrative purposes and should not be deemed as requirements 1440 * on an implementation or as an exhaustive list of all parameters 1441 * inside an SCTP TCB. Each implementation may need its own additional 1442 * parameters for optimization. 1443 */ 1444 1445 1446 /* Here we have information about each individual association. */ 1447 struct sctp_association { 1448 1449 /* A base structure common to endpoint and association. 1450 * In this context, it represents the associations's view 1451 * of the local endpoint of the association. 1452 */ 1453 struct sctp_ep_common base; 1454 1455 /* Associations on the same socket. */ 1456 struct list_head asocs; 1457 1458 /* association id. */ 1459 sctp_assoc_t assoc_id; 1460 1461 /* This is our parent endpoint. */ 1462 struct sctp_endpoint *ep; 1463 1464 /* These are those association elements needed in the cookie. */ 1465 struct sctp_cookie c; 1466 1467 /* This is all information about our peer. */ 1468 struct { 1469 /* transport_addr_list 1470 * 1471 * Peer : A list of SCTP transport addresses that the 1472 * Transport : peer is bound to. This information is derived 1473 * Address : from the INIT or INIT ACK and is used to 1474 * List : associate an inbound packet with a given 1475 * : association. Normally this information is 1476 * : hashed or keyed for quick lookup and access 1477 * : of the TCB. 1478 * : The list is also initialized with the list 1479 * : of addresses passed with the sctp_connectx() 1480 * : call. 1481 * 1482 * It is a list of SCTP_transport's. 1483 */ 1484 struct list_head transport_addr_list; 1485 1486 /* rwnd 1487 * 1488 * Peer Rwnd : Current calculated value of the peer's rwnd. 1489 */ 1490 __u32 rwnd; 1491 1492 /* transport_count 1493 * 1494 * Peer : A count of the number of peer addresses 1495 * Transport : in the Peer Transport Address List. 1496 * Address : 1497 * Count : 1498 */ 1499 __u16 transport_count; 1500 1501 /* port 1502 * The transport layer port number. 1503 */ 1504 __u16 port; 1505 1506 /* primary_path 1507 * 1508 * Primary : This is the current primary destination 1509 * Path : transport address of the peer endpoint. It 1510 * : may also specify a source transport address 1511 * : on this endpoint. 1512 * 1513 * All of these paths live on transport_addr_list. 1514 * 1515 * At the bakeoffs, we discovered that the intent of 1516 * primaryPath is that it only changes when the ULP 1517 * asks to have it changed. We add the activePath to 1518 * designate the connection we are currently using to 1519 * transmit new data and most control chunks. 1520 */ 1521 struct sctp_transport *primary_path; 1522 1523 /* Cache the primary path address here, when we 1524 * need a an address for msg_name. 1525 */ 1526 union sctp_addr primary_addr; 1527 1528 /* active_path 1529 * The path that we are currently using to 1530 * transmit new data and most control chunks. 1531 */ 1532 struct sctp_transport *active_path; 1533 1534 /* retran_path 1535 * 1536 * RFC2960 6.4 Multi-homed SCTP Endpoints 1537 * ... 1538 * Furthermore, when its peer is multi-homed, an 1539 * endpoint SHOULD try to retransmit a chunk to an 1540 * active destination transport address that is 1541 * different from the last destination address to 1542 * which the DATA chunk was sent. 1543 */ 1544 struct sctp_transport *retran_path; 1545 1546 /* Pointer to last transport I have sent on. */ 1547 struct sctp_transport *last_sent_to; 1548 1549 /* This is the last transport I have received DATA on. */ 1550 struct sctp_transport *last_data_from; 1551 1552 /* 1553 * Mapping An array of bits or bytes indicating which out of 1554 * Array order TSN's have been received (relative to the 1555 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1556 * order packets have been received, this array 1557 * will be set to all zero. This structure may be 1558 * in the form of a circular buffer or bit array. 1559 * 1560 * Last Rcvd : This is the last TSN received in 1561 * TSN : sequence. This value is set initially by 1562 * : taking the peer's Initial TSN, received in 1563 * : the INIT or INIT ACK chunk, and subtracting 1564 * : one from it. 1565 * 1566 * Throughout most of the specification this is called the 1567 * "Cumulative TSN ACK Point". In this case, we 1568 * ignore the advice in 12.2 in favour of the term 1569 * used in the bulk of the text. This value is hidden 1570 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1571 */ 1572 struct sctp_tsnmap tsn_map; 1573 1574 /* This mask is used to disable sending the ASCONF chunk 1575 * with specified parameter to peer. 1576 */ 1577 __be16 addip_disabled_mask; 1578 1579 /* These are capabilities which our peer advertised. */ 1580 __u8 ecn_capable:1, /* Can peer do ECN? */ 1581 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1582 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1583 hostname_address:1, /* Peer understands DNS addresses? */ 1584 asconf_capable:1, /* Does peer support ADDIP? */ 1585 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1586 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1587 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1588 1589 /* sack_needed : This flag indicates if the next received 1590 * : packet is to be responded to with a 1591 * : SACK. This is initialized to 0. When a packet 1592 * : is received sack_cnt is incremented. If this value 1593 * : reaches 2 or more, a SACK is sent and the 1594 * : value is reset to 0. Note: This is used only 1595 * : when no DATA chunks are received out of 1596 * : order. When DATA chunks are out of order, 1597 * : SACK's are not delayed (see Section 6). 1598 */ 1599 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1600 sack_generation:1, 1601 zero_window_announced:1; 1602 __u32 sack_cnt; 1603 1604 __u32 adaptation_ind; /* Adaptation Code point. */ 1605 1606 struct sctp_inithdr_host i; 1607 void *cookie; 1608 int cookie_len; 1609 1610 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1611 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1612 * Initial TSN Value minus 1 1613 */ 1614 __u32 addip_serial; 1615 1616 /* SCTP-AUTH: We need to know pears random number, hmac list 1617 * and authenticated chunk list. All that is part of the 1618 * cookie and these are just pointers to those locations 1619 */ 1620 struct sctp_random_param *peer_random; 1621 struct sctp_chunks_param *peer_chunks; 1622 struct sctp_hmac_algo_param *peer_hmacs; 1623 } peer; 1624 1625 /* State : A state variable indicating what state the 1626 * : association is in, i.e. COOKIE-WAIT, 1627 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1628 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1629 * 1630 * Note: No "CLOSED" state is illustrated since if a 1631 * association is "CLOSED" its TCB SHOULD be removed. 1632 * 1633 * In this implementation we DO have a CLOSED 1634 * state which is used during initiation and shutdown. 1635 * 1636 * State takes values from SCTP_STATE_*. 1637 */ 1638 enum sctp_state state; 1639 1640 /* Overall : The overall association error count. 1641 * Error Count : [Clear this any time I get something.] 1642 */ 1643 int overall_error_count; 1644 1645 /* The cookie life I award for any cookie. */ 1646 ktime_t cookie_life; 1647 1648 /* These are the association's initial, max, and min RTO values. 1649 * These values will be initialized by system defaults, but can 1650 * be modified via the SCTP_RTOINFO socket option. 1651 */ 1652 unsigned long rto_initial; 1653 unsigned long rto_max; 1654 unsigned long rto_min; 1655 1656 /* Maximum number of new data packets that can be sent in a burst. */ 1657 int max_burst; 1658 1659 /* This is the max_retrans value for the association. This value will 1660 * be initialized initialized from system defaults, but can be 1661 * modified by the SCTP_ASSOCINFO socket option. 1662 */ 1663 int max_retrans; 1664 1665 /* This is the partially failed retrans value for the transport 1666 * and will be initialized from the assocs value. This can be 1667 * changed using the SCTP_PEER_ADDR_THLDS socket option 1668 */ 1669 int pf_retrans; 1670 1671 /* Maximum number of times the endpoint will retransmit INIT */ 1672 __u16 max_init_attempts; 1673 1674 /* How many times have we resent an INIT? */ 1675 __u16 init_retries; 1676 1677 /* The largest timeout or RTO value to use in attempting an INIT */ 1678 unsigned long max_init_timeo; 1679 1680 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1681 * the destination address every heartbeat interval. This value 1682 * will be inherited by all new transports. 1683 */ 1684 unsigned long hbinterval; 1685 1686 /* This is the max_retrans value for new transports in the 1687 * association. 1688 */ 1689 __u16 pathmaxrxt; 1690 1691 /* Flag that path mtu update is pending */ 1692 __u8 pmtu_pending; 1693 1694 /* Association : The smallest PMTU discovered for all of the 1695 * PMTU : peer's transport addresses. 1696 */ 1697 __u32 pathmtu; 1698 1699 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1700 __u32 param_flags; 1701 1702 __u32 sackfreq; 1703 /* SACK delay timeout */ 1704 unsigned long sackdelay; 1705 1706 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1707 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1708 1709 /* Transport to which SHUTDOWN chunk was last sent. */ 1710 struct sctp_transport *shutdown_last_sent_to; 1711 1712 /* Transport to which INIT chunk was last sent. */ 1713 struct sctp_transport *init_last_sent_to; 1714 1715 /* How many times have we resent a SHUTDOWN */ 1716 int shutdown_retries; 1717 1718 /* Next TSN : The next TSN number to be assigned to a new 1719 * : DATA chunk. This is sent in the INIT or INIT 1720 * : ACK chunk to the peer and incremented each 1721 * : time a DATA chunk is assigned a TSN 1722 * : (normally just prior to transmit or during 1723 * : fragmentation). 1724 */ 1725 __u32 next_tsn; 1726 1727 /* 1728 * Last Rcvd : This is the last TSN received in sequence. This value 1729 * TSN : is set initially by taking the peer's Initial TSN, 1730 * : received in the INIT or INIT ACK chunk, and 1731 * : subtracting one from it. 1732 * 1733 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1734 */ 1735 1736 __u32 ctsn_ack_point; 1737 1738 /* PR-SCTP Advanced.Peer.Ack.Point */ 1739 __u32 adv_peer_ack_point; 1740 1741 /* Highest TSN that is acknowledged by incoming SACKs. */ 1742 __u32 highest_sacked; 1743 1744 /* TSN marking the fast recovery exit point */ 1745 __u32 fast_recovery_exit; 1746 1747 /* Flag to track the current fast recovery state */ 1748 __u8 fast_recovery; 1749 1750 /* The number of unacknowledged data chunks. Reported through 1751 * the SCTP_STATUS sockopt. 1752 */ 1753 __u16 unack_data; 1754 1755 /* The total number of data chunks that we've had to retransmit 1756 * as the result of a T3 timer expiration 1757 */ 1758 __u32 rtx_data_chunks; 1759 1760 /* This is the association's receive buffer space. This value is used 1761 * to set a_rwnd field in an INIT or a SACK chunk. 1762 */ 1763 __u32 rwnd; 1764 1765 /* This is the last advertised value of rwnd over a SACK chunk. */ 1766 __u32 a_rwnd; 1767 1768 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1769 * to slop over a maximum of the association's frag_point. 1770 */ 1771 __u32 rwnd_over; 1772 1773 /* Keeps treack of rwnd pressure. This happens when we have 1774 * a window, but not recevie buffer (i.e small packets). This one 1775 * is releases slowly (1 PMTU at a time ). 1776 */ 1777 __u32 rwnd_press; 1778 1779 /* This is the sndbuf size in use for the association. 1780 * This corresponds to the sndbuf size for the association, 1781 * as specified in the sk->sndbuf. 1782 */ 1783 int sndbuf_used; 1784 1785 /* This is the amount of memory that this association has allocated 1786 * in the receive path at any given time. 1787 */ 1788 atomic_t rmem_alloc; 1789 1790 /* This is the wait queue head for send requests waiting on 1791 * the association sndbuf space. 1792 */ 1793 wait_queue_head_t wait; 1794 1795 /* The message size at which SCTP fragmentation will occur. */ 1796 __u32 frag_point; 1797 __u32 user_frag; 1798 1799 /* Counter used to count INIT errors. */ 1800 int init_err_counter; 1801 1802 /* Count the number of INIT cycles (for doubling timeout). */ 1803 int init_cycle; 1804 1805 /* Default send parameters. */ 1806 __u16 default_stream; 1807 __u16 default_flags; 1808 __u32 default_ppid; 1809 __u32 default_context; 1810 __u32 default_timetolive; 1811 1812 /* Default receive parameters */ 1813 __u32 default_rcv_context; 1814 1815 /* Stream arrays */ 1816 struct sctp_stream stream; 1817 1818 /* All outbound chunks go through this structure. */ 1819 struct sctp_outq outqueue; 1820 1821 /* A smart pipe that will handle reordering and fragmentation, 1822 * as well as handle passing events up to the ULP. 1823 */ 1824 struct sctp_ulpq ulpq; 1825 1826 /* Last TSN that caused an ECNE Chunk to be sent. */ 1827 __u32 last_ecne_tsn; 1828 1829 /* Last TSN that caused a CWR Chunk to be sent. */ 1830 __u32 last_cwr_tsn; 1831 1832 /* How many duplicated TSNs have we seen? */ 1833 int numduptsns; 1834 1835 /* These are to support 1836 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1837 * and Enforcement of Flow and Message Limits" 1838 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1839 * or "ADDIP" for short. 1840 */ 1841 1842 1843 1844 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1845 * 1846 * R1) One and only one ASCONF Chunk MAY be in transit and 1847 * unacknowledged at any one time. If a sender, after sending 1848 * an ASCONF chunk, decides it needs to transfer another 1849 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1850 * returns from the previous ASCONF Chunk before sending a 1851 * subsequent ASCONF. Note this restriction binds each side, 1852 * so at any time two ASCONF may be in-transit on any given 1853 * association (one sent from each endpoint). 1854 * 1855 * [This is our one-and-only-one ASCONF in flight. If we do 1856 * not have an ASCONF in flight, this is NULL.] 1857 */ 1858 struct sctp_chunk *addip_last_asconf; 1859 1860 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1861 * 1862 * This is needed to implement itmes E1 - E4 of the updated 1863 * spec. Here is the justification: 1864 * 1865 * Since the peer may bundle multiple ASCONF chunks toward us, 1866 * we now need the ability to cache multiple ACKs. The section 1867 * describes in detail how they are cached and cleaned up. 1868 */ 1869 struct list_head asconf_ack_list; 1870 1871 /* These ASCONF chunks are waiting to be sent. 1872 * 1873 * These chunaks can't be pushed to outqueue until receiving 1874 * ASCONF_ACK for the previous ASCONF indicated by 1875 * addip_last_asconf, so as to guarantee that only one ASCONF 1876 * is in flight at any time. 1877 * 1878 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1879 * 1880 * In defining the ASCONF Chunk transfer procedures, it is 1881 * essential that these transfers MUST NOT cause congestion 1882 * within the network. To achieve this, we place these 1883 * restrictions on the transfer of ASCONF Chunks: 1884 * 1885 * R1) One and only one ASCONF Chunk MAY be in transit and 1886 * unacknowledged at any one time. If a sender, after sending 1887 * an ASCONF chunk, decides it needs to transfer another 1888 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1889 * returns from the previous ASCONF Chunk before sending a 1890 * subsequent ASCONF. Note this restriction binds each side, 1891 * so at any time two ASCONF may be in-transit on any given 1892 * association (one sent from each endpoint). 1893 * 1894 * 1895 * [I really think this is EXACTLY the sort of intelligence 1896 * which already resides in sctp_outq. Please move this 1897 * queue and its supporting logic down there. --piggy] 1898 */ 1899 struct list_head addip_chunk_list; 1900 1901 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1902 * 1903 * A2) A serial number should be assigned to the Chunk. The 1904 * serial number SHOULD be a monotonically increasing 1905 * number. The serial number SHOULD be initialized at 1906 * the start of the association to the same value as the 1907 * Initial TSN and every time a new ASCONF chunk is created 1908 * it is incremented by one after assigning the serial number 1909 * to the newly created chunk. 1910 * 1911 * ADDIP 1912 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1913 * 1914 * Serial Number : 32 bits (unsigned integer) 1915 * 1916 * This value represents a Serial Number for the ASCONF 1917 * Chunk. The valid range of Serial Number is from 0 to 1918 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1919 * after reaching 4294967295. 1920 */ 1921 __u32 addip_serial; 1922 int src_out_of_asoc_ok; 1923 union sctp_addr *asconf_addr_del_pending; 1924 struct sctp_transport *new_transport; 1925 1926 /* SCTP AUTH: list of the endpoint shared keys. These 1927 * keys are provided out of band by the user applicaton 1928 * and can't change during the lifetime of the association 1929 */ 1930 struct list_head endpoint_shared_keys; 1931 1932 /* SCTP AUTH: 1933 * The current generated assocaition shared key (secret) 1934 */ 1935 struct sctp_auth_bytes *asoc_shared_key; 1936 1937 /* SCTP AUTH: hmac id of the first peer requested algorithm 1938 * that we support. 1939 */ 1940 __u16 default_hmac_id; 1941 1942 __u16 active_key_id; 1943 1944 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1945 temp:1, /* Is it a temporary association? */ 1946 force_delay:1, 1947 prsctp_enable:1, 1948 reconf_enable:1; 1949 1950 __u8 strreset_enable; 1951 __u8 strreset_outstanding; /* request param count on the fly */ 1952 1953 __u32 strreset_outseq; /* Update after receiving response */ 1954 __u32 strreset_inseq; /* Update after receiving request */ 1955 __u32 strreset_result[2]; /* save the results of last 2 responses */ 1956 1957 struct sctp_chunk *strreset_chunk; /* save request chunk */ 1958 1959 struct sctp_priv_assoc_stats stats; 1960 1961 int sent_cnt_removable; 1962 1963 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1964 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1965 }; 1966 1967 1968 /* An eyecatcher for determining if we are really looking at an 1969 * association data structure. 1970 */ 1971 enum { 1972 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1973 }; 1974 1975 /* Recover the outter association structure. */ 1976 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1977 { 1978 struct sctp_association *asoc; 1979 1980 asoc = container_of(base, struct sctp_association, base); 1981 return asoc; 1982 } 1983 1984 /* These are function signatures for manipulating associations. */ 1985 1986 1987 struct sctp_association * 1988 sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, 1989 enum sctp_scope scope, gfp_t gfp); 1990 void sctp_association_free(struct sctp_association *); 1991 void sctp_association_put(struct sctp_association *); 1992 void sctp_association_hold(struct sctp_association *); 1993 1994 struct sctp_transport *sctp_assoc_choose_alter_transport( 1995 struct sctp_association *, struct sctp_transport *); 1996 void sctp_assoc_update_retran_path(struct sctp_association *); 1997 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1998 const union sctp_addr *); 1999 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 2000 const union sctp_addr *laddr); 2001 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 2002 const union sctp_addr *address, 2003 const gfp_t gfp, 2004 const int peer_state); 2005 void sctp_assoc_del_peer(struct sctp_association *asoc, 2006 const union sctp_addr *addr); 2007 void sctp_assoc_rm_peer(struct sctp_association *asoc, 2008 struct sctp_transport *peer); 2009 void sctp_assoc_control_transport(struct sctp_association *asoc, 2010 struct sctp_transport *transport, 2011 enum sctp_transport_cmd command, 2012 sctp_sn_error_t error); 2013 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 2014 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 2015 struct net *, 2016 const union sctp_addr *, 2017 const union sctp_addr *); 2018 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 2019 int sctp_assoc_update(struct sctp_association *old, 2020 struct sctp_association *new); 2021 2022 __u32 sctp_association_get_next_tsn(struct sctp_association *); 2023 2024 void sctp_assoc_sync_pmtu(struct sctp_association *asoc); 2025 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 2026 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 2027 void sctp_assoc_set_primary(struct sctp_association *, 2028 struct sctp_transport *); 2029 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 2030 struct sctp_transport *); 2031 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, 2032 enum sctp_scope scope, gfp_t gfp); 2033 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 2034 struct sctp_cookie*, 2035 gfp_t gfp); 2036 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 2037 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 2038 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 2039 const struct sctp_association *asoc, 2040 __be32 serial); 2041 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 2042 2043 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 2044 const union sctp_addr *ss2); 2045 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 2046 2047 /* A convenience structure to parse out SCTP specific CMSGs. */ 2048 struct sctp_cmsgs { 2049 struct sctp_initmsg *init; 2050 struct sctp_sndrcvinfo *srinfo; 2051 struct sctp_sndinfo *sinfo; 2052 }; 2053 2054 /* Structure for tracking memory objects */ 2055 struct sctp_dbg_objcnt_entry { 2056 char *label; 2057 atomic_t *counter; 2058 }; 2059 2060 #endif /* __sctp_structs_h__ */ 2061