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 63 /* A convenience structure for handling sockaddr structures. 64 * We should wean ourselves off this. 65 */ 66 union sctp_addr { 67 struct sockaddr_in v4; 68 struct sockaddr_in6 v6; 69 struct sockaddr sa; 70 }; 71 72 /* Forward declarations for data structures. */ 73 struct sctp_globals; 74 struct sctp_endpoint; 75 struct sctp_association; 76 struct sctp_transport; 77 struct sctp_packet; 78 struct sctp_chunk; 79 struct sctp_inq; 80 struct sctp_outq; 81 struct sctp_bind_addr; 82 struct sctp_ulpq; 83 struct sctp_ep_common; 84 struct sctp_ssnmap; 85 struct crypto_shash; 86 87 88 #include <net/sctp/tsnmap.h> 89 #include <net/sctp/ulpevent.h> 90 #include <net/sctp/ulpqueue.h> 91 92 /* Structures useful for managing bind/connect. */ 93 94 struct sctp_bind_bucket { 95 unsigned short port; 96 unsigned short fastreuse; 97 struct hlist_node node; 98 struct hlist_head owner; 99 struct net *net; 100 }; 101 102 struct sctp_bind_hashbucket { 103 spinlock_t lock; 104 struct hlist_head chain; 105 }; 106 107 /* Used for hashing all associations. */ 108 struct sctp_hashbucket { 109 rwlock_t lock; 110 struct hlist_head chain; 111 } __attribute__((__aligned__(8))); 112 113 114 /* The SCTP globals structure. */ 115 extern struct sctp_globals { 116 /* This is a list of groups of functions for each address 117 * family that we support. 118 */ 119 struct list_head address_families; 120 121 /* This is the hash of all endpoints. */ 122 struct sctp_hashbucket *ep_hashtable; 123 /* This is the sctp port control hash. */ 124 struct sctp_bind_hashbucket *port_hashtable; 125 /* This is the hash of all transports. */ 126 struct rhashtable transport_hashtable; 127 128 /* Sizes of above hashtables. */ 129 int ep_hashsize; 130 int port_hashsize; 131 132 /* Default initialization values to be applied to new associations. */ 133 __u16 max_instreams; 134 __u16 max_outstreams; 135 136 /* Flag to indicate whether computing and verifying checksum 137 * is disabled. */ 138 bool checksum_disable; 139 } sctp_globals; 140 141 #define sctp_max_instreams (sctp_globals.max_instreams) 142 #define sctp_max_outstreams (sctp_globals.max_outstreams) 143 #define sctp_address_families (sctp_globals.address_families) 144 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 145 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 146 #define sctp_port_hashsize (sctp_globals.port_hashsize) 147 #define sctp_port_hashtable (sctp_globals.port_hashtable) 148 #define sctp_transport_hashtable (sctp_globals.transport_hashtable) 149 #define sctp_checksum_disable (sctp_globals.checksum_disable) 150 151 /* SCTP Socket type: UDP or TCP style. */ 152 typedef enum { 153 SCTP_SOCKET_UDP = 0, 154 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 155 SCTP_SOCKET_TCP 156 } sctp_socket_type_t; 157 158 /* Per socket SCTP information. */ 159 struct sctp_sock { 160 /* inet_sock has to be the first member of sctp_sock */ 161 struct inet_sock inet; 162 /* What kind of a socket is this? */ 163 sctp_socket_type_t type; 164 165 /* PF_ family specific functions. */ 166 struct sctp_pf *pf; 167 168 /* Access to HMAC transform. */ 169 struct crypto_shash *hmac; 170 char *sctp_hmac_alg; 171 172 /* What is our base endpointer? */ 173 struct sctp_endpoint *ep; 174 175 struct sctp_bind_bucket *bind_hash; 176 /* Various Socket Options. */ 177 __u16 default_stream; 178 __u32 default_ppid; 179 __u16 default_flags; 180 __u32 default_context; 181 __u32 default_timetolive; 182 __u32 default_rcv_context; 183 int max_burst; 184 185 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 186 * the destination address every heartbeat interval. This value 187 * will be inherited by all new associations. 188 */ 189 __u32 hbinterval; 190 191 /* This is the max_retrans value for new associations. */ 192 __u16 pathmaxrxt; 193 194 /* The initial Path MTU to use for new associations. */ 195 __u32 pathmtu; 196 197 /* The default SACK delay timeout for new associations. */ 198 __u32 sackdelay; 199 __u32 sackfreq; 200 201 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 202 __u32 param_flags; 203 204 struct sctp_initmsg initmsg; 205 struct sctp_rtoinfo rtoinfo; 206 struct sctp_paddrparams paddrparam; 207 struct sctp_event_subscribe subscribe; 208 struct sctp_assocparams assocparams; 209 210 int user_frag; 211 212 __u32 autoclose; 213 __u32 adaptation_ind; 214 __u32 pd_point; 215 __u16 nodelay:1, 216 disable_fragments:1, 217 v4mapped:1, 218 frag_interleave:1, 219 recvrcvinfo:1, 220 recvnxtinfo:1; 221 222 atomic_t pd_mode; 223 /* Receive to here while partial delivery is in effect. */ 224 struct sk_buff_head pd_lobby; 225 226 /* These must be the last fields, as they will skipped on copies, 227 * like on accept and peeloff operations 228 */ 229 struct list_head auto_asconf_list; 230 int do_auto_asconf; 231 }; 232 233 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 234 { 235 return (struct sctp_sock *)sk; 236 } 237 238 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 239 { 240 return (struct sock *)sp; 241 } 242 243 #if IS_ENABLED(CONFIG_IPV6) 244 struct sctp6_sock { 245 struct sctp_sock sctp; 246 struct ipv6_pinfo inet6; 247 }; 248 #endif /* CONFIG_IPV6 */ 249 250 251 /* This is our APPLICATION-SPECIFIC state cookie. 252 * THIS IS NOT DICTATED BY THE SPECIFICATION. 253 */ 254 /* These are the parts of an association which we send in the cookie. 255 * Most of these are straight out of: 256 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 257 * 258 */ 259 260 struct sctp_cookie { 261 262 /* My : Tag expected in every inbound packet and sent 263 * Verification: in the INIT or INIT ACK chunk. 264 * Tag : 265 */ 266 __u32 my_vtag; 267 268 /* Peer's : Tag expected in every outbound packet except 269 * Verification: in the INIT chunk. 270 * Tag : 271 */ 272 __u32 peer_vtag; 273 274 /* The rest of these are not from the spec, but really need to 275 * be in the cookie. 276 */ 277 278 /* My Tie Tag : Assist in discovering a restarting association. */ 279 __u32 my_ttag; 280 281 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 282 __u32 peer_ttag; 283 284 /* When does this cookie expire? */ 285 ktime_t expiration; 286 287 /* Number of inbound/outbound streams which are set 288 * and negotiated during the INIT process. 289 */ 290 __u16 sinit_num_ostreams; 291 __u16 sinit_max_instreams; 292 293 /* This is the first sequence number I used. */ 294 __u32 initial_tsn; 295 296 /* This holds the originating address of the INIT packet. */ 297 union sctp_addr peer_addr; 298 299 /* IG Section 2.35.3 300 * Include the source port of the INIT-ACK 301 */ 302 __u16 my_port; 303 304 __u8 prsctp_capable; 305 306 /* Padding for future use */ 307 __u8 padding; 308 309 __u32 adaptation_ind; 310 311 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 312 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 313 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 314 315 /* This is a shim for my peer's INIT packet, followed by 316 * a copy of the raw address list of the association. 317 * The length of the raw address list is saved in the 318 * raw_addr_list_len field, which will be used at the time when 319 * the association TCB is re-constructed from the cookie. 320 */ 321 __u32 raw_addr_list_len; 322 struct sctp_init_chunk peer_init[0]; 323 }; 324 325 326 /* The format of our cookie that we send to our peer. */ 327 struct sctp_signed_cookie { 328 __u8 signature[SCTP_SECRET_SIZE]; 329 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 330 struct sctp_cookie c; 331 } __packed; 332 333 /* This is another convenience type to allocate memory for address 334 * params for the maximum size and pass such structures around 335 * internally. 336 */ 337 union sctp_addr_param { 338 struct sctp_paramhdr p; 339 struct sctp_ipv4addr_param v4; 340 struct sctp_ipv6addr_param v6; 341 }; 342 343 /* A convenience type to allow walking through the various 344 * parameters and avoid casting all over the place. 345 */ 346 union sctp_params { 347 void *v; 348 struct sctp_paramhdr *p; 349 struct sctp_cookie_preserve_param *life; 350 struct sctp_hostname_param *dns; 351 struct sctp_cookie_param *cookie; 352 struct sctp_supported_addrs_param *sat; 353 struct sctp_ipv4addr_param *v4; 354 struct sctp_ipv6addr_param *v6; 355 union sctp_addr_param *addr; 356 struct sctp_adaptation_ind_param *aind; 357 struct sctp_supported_ext_param *ext; 358 struct sctp_random_param *random; 359 struct sctp_chunks_param *chunks; 360 struct sctp_hmac_algo_param *hmac_algo; 361 struct sctp_addip_param *addip; 362 }; 363 364 /* RFC 2960. Section 3.3.5 Heartbeat. 365 * Heartbeat Information: variable length 366 * The Sender-specific Heartbeat Info field should normally include 367 * information about the sender's current time when this HEARTBEAT 368 * chunk is sent and the destination transport address to which this 369 * HEARTBEAT is sent (see Section 8.3). 370 */ 371 typedef struct sctp_sender_hb_info { 372 struct sctp_paramhdr param_hdr; 373 union sctp_addr daddr; 374 unsigned long sent_at; 375 __u64 hb_nonce; 376 } __packed sctp_sender_hb_info_t; 377 378 /* 379 * RFC 2960 1.3.2 Sequenced Delivery within Streams 380 * 381 * The term "stream" is used in SCTP to refer to a sequence of user 382 * messages that are to be delivered to the upper-layer protocol in 383 * order with respect to other messages within the same stream. This is 384 * in contrast to its usage in TCP, where it refers to a sequence of 385 * bytes (in this document a byte is assumed to be eight bits). 386 * ... 387 * 388 * This is the structure we use to track both our outbound and inbound 389 * SSN, or Stream Sequence Numbers. 390 */ 391 392 struct sctp_stream { 393 __u16 *ssn; 394 unsigned int len; 395 }; 396 397 struct sctp_ssnmap { 398 struct sctp_stream in; 399 struct sctp_stream out; 400 }; 401 402 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 403 gfp_t gfp); 404 void sctp_ssnmap_free(struct sctp_ssnmap *map); 405 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 406 407 /* What is the current SSN number for this stream? */ 408 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 409 { 410 return stream->ssn[id]; 411 } 412 413 /* Return the next SSN number for this stream. */ 414 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 415 { 416 return stream->ssn[id]++; 417 } 418 419 /* Skip over this ssn and all below. */ 420 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 421 __u16 ssn) 422 { 423 stream->ssn[id] = ssn+1; 424 } 425 426 /* 427 * Pointers to address related SCTP functions. 428 * (i.e. things that depend on the address family.) 429 */ 430 struct sctp_af { 431 int (*sctp_xmit) (struct sk_buff *skb, 432 struct sctp_transport *); 433 int (*setsockopt) (struct sock *sk, 434 int level, 435 int optname, 436 char __user *optval, 437 unsigned int optlen); 438 int (*getsockopt) (struct sock *sk, 439 int level, 440 int optname, 441 char __user *optval, 442 int __user *optlen); 443 int (*compat_setsockopt) (struct sock *sk, 444 int level, 445 int optname, 446 char __user *optval, 447 unsigned int optlen); 448 int (*compat_getsockopt) (struct sock *sk, 449 int level, 450 int optname, 451 char __user *optval, 452 int __user *optlen); 453 void (*get_dst) (struct sctp_transport *t, 454 union sctp_addr *saddr, 455 struct flowi *fl, 456 struct sock *sk); 457 void (*get_saddr) (struct sctp_sock *sk, 458 struct sctp_transport *t, 459 struct flowi *fl); 460 void (*copy_addrlist) (struct list_head *, 461 struct net_device *); 462 int (*cmp_addr) (const union sctp_addr *addr1, 463 const union sctp_addr *addr2); 464 void (*addr_copy) (union sctp_addr *dst, 465 union sctp_addr *src); 466 void (*from_skb) (union sctp_addr *, 467 struct sk_buff *skb, 468 int saddr); 469 void (*from_sk) (union sctp_addr *, 470 struct sock *sk); 471 void (*from_addr_param) (union sctp_addr *, 472 union sctp_addr_param *, 473 __be16 port, int iif); 474 int (*to_addr_param) (const union sctp_addr *, 475 union sctp_addr_param *); 476 int (*addr_valid) (union sctp_addr *, 477 struct sctp_sock *, 478 const struct sk_buff *); 479 sctp_scope_t (*scope) (union sctp_addr *); 480 void (*inaddr_any) (union sctp_addr *, __be16); 481 int (*is_any) (const union sctp_addr *); 482 int (*available) (union sctp_addr *, 483 struct sctp_sock *); 484 int (*skb_iif) (const struct sk_buff *sk); 485 int (*is_ce) (const struct sk_buff *sk); 486 void (*seq_dump_addr)(struct seq_file *seq, 487 union sctp_addr *addr); 488 void (*ecn_capable)(struct sock *sk); 489 __u16 net_header_len; 490 int sockaddr_len; 491 sa_family_t sa_family; 492 struct list_head list; 493 }; 494 495 struct sctp_af *sctp_get_af_specific(sa_family_t); 496 int sctp_register_af(struct sctp_af *); 497 498 /* Protocol family functions. */ 499 struct sctp_pf { 500 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 501 void (*skb_msgname) (struct sk_buff *, char *, int *); 502 int (*af_supported) (sa_family_t, struct sctp_sock *); 503 int (*cmp_addr) (const union sctp_addr *, 504 const union sctp_addr *, 505 struct sctp_sock *); 506 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 507 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 508 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 509 struct sock *(*create_accept_sk) (struct sock *sk, 510 struct sctp_association *asoc); 511 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 512 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 513 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 514 struct sctp_af *af; 515 }; 516 517 518 /* Structure to track chunk fragments that have been acked, but peer 519 * fragments of the same message have not. 520 */ 521 struct sctp_datamsg { 522 /* Chunks waiting to be submitted to lower layer. */ 523 struct list_head chunks; 524 /* Reference counting. */ 525 atomic_t refcnt; 526 /* When is this message no longer interesting to the peer? */ 527 unsigned long expires_at; 528 /* Did the messenge fail to send? */ 529 int send_error; 530 u8 send_failed:1, 531 can_abandon:1, /* can chunks from this message can be abandoned. */ 532 can_delay; /* should this message be Nagle delayed */ 533 }; 534 535 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 536 struct sctp_sndrcvinfo *, 537 struct iov_iter *); 538 void sctp_datamsg_put(struct sctp_datamsg *); 539 void sctp_chunk_fail(struct sctp_chunk *, int error); 540 int sctp_chunk_abandoned(struct sctp_chunk *); 541 542 /* RFC2960 1.4 Key Terms 543 * 544 * o Chunk: A unit of information within an SCTP packet, consisting of 545 * a chunk header and chunk-specific content. 546 * 547 * As a matter of convenience, we remember the SCTP common header for 548 * each chunk as well as a few other header pointers... 549 */ 550 struct sctp_chunk { 551 struct list_head list; 552 553 atomic_t refcnt; 554 555 /* This is our link to the per-transport transmitted list. */ 556 struct list_head transmitted_list; 557 558 /* This field is used by chunks that hold fragmented data. 559 * For the first fragment this is the list that holds the rest of 560 * fragments. For the remaining fragments, this is the link to the 561 * frag_list maintained in the first fragment. 562 */ 563 struct list_head frag_list; 564 565 /* This points to the sk_buff containing the actual data. */ 566 struct sk_buff *skb; 567 568 /* These are the SCTP headers by reverse order in a packet. 569 * Note that some of these may happen more than once. In that 570 * case, we point at the "current" one, whatever that means 571 * for that level of header. 572 */ 573 574 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 575 union sctp_params param_hdr; 576 union { 577 __u8 *v; 578 struct sctp_datahdr *data_hdr; 579 struct sctp_inithdr *init_hdr; 580 struct sctp_sackhdr *sack_hdr; 581 struct sctp_heartbeathdr *hb_hdr; 582 struct sctp_sender_hb_info *hbs_hdr; 583 struct sctp_shutdownhdr *shutdown_hdr; 584 struct sctp_signed_cookie *cookie_hdr; 585 struct sctp_ecnehdr *ecne_hdr; 586 struct sctp_cwrhdr *ecn_cwr_hdr; 587 struct sctp_errhdr *err_hdr; 588 struct sctp_addiphdr *addip_hdr; 589 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 590 struct sctp_authhdr *auth_hdr; 591 } subh; 592 593 __u8 *chunk_end; 594 595 struct sctp_chunkhdr *chunk_hdr; 596 struct sctphdr *sctp_hdr; 597 598 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 599 struct sctp_sndrcvinfo sinfo; 600 601 /* Which association does this belong to? */ 602 struct sctp_association *asoc; 603 604 /* What endpoint received this chunk? */ 605 struct sctp_ep_common *rcvr; 606 607 /* We fill this in if we are calculating RTT. */ 608 unsigned long sent_at; 609 610 /* What is the origin IP address for this chunk? */ 611 union sctp_addr source; 612 /* Destination address for this chunk. */ 613 union sctp_addr dest; 614 615 /* For outbound message, track all fragments for SEND_FAILED. */ 616 struct sctp_datamsg *msg; 617 618 /* For an inbound chunk, this tells us where it came from. 619 * For an outbound chunk, it tells us where we'd like it to 620 * go. It is NULL if we have no preference. 621 */ 622 struct sctp_transport *transport; 623 624 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 625 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 626 * spec violates the principle premis that all chunks are processed 627 * in order. 628 */ 629 struct sk_buff *auth_chunk; 630 631 #define SCTP_CAN_FRTX 0x0 632 #define SCTP_NEED_FRTX 0x1 633 #define SCTP_DONT_FRTX 0x2 634 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 635 resent:1, /* Has this chunk ever been resent. */ 636 has_tsn:1, /* Does this chunk have a TSN yet? */ 637 has_ssn:1, /* Does this chunk have a SSN yet? */ 638 singleton:1, /* Only chunk in the packet? */ 639 end_of_packet:1, /* Last chunk in the packet? */ 640 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 641 pdiscard:1, /* Discard the whole packet now? */ 642 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 643 data_accepted:1, /* At least 1 chunk accepted */ 644 auth:1, /* IN: was auth'ed | OUT: needs auth */ 645 has_asconf:1, /* IN: have seen an asconf before */ 646 tsn_missing_report:2, /* Data chunk missing counter. */ 647 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 648 }; 649 650 void sctp_chunk_hold(struct sctp_chunk *); 651 void sctp_chunk_put(struct sctp_chunk *); 652 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 653 struct iov_iter *from); 654 void sctp_chunk_free(struct sctp_chunk *); 655 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 656 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 657 const struct sctp_association *, 658 struct sock *, gfp_t gfp); 659 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 660 union sctp_addr *); 661 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 662 663 enum { 664 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 665 SCTP_ADDR_SRC, /* address can be used as source */ 666 SCTP_ADDR_DEL, /* address about to be deleted */ 667 }; 668 669 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 670 struct sctp_sockaddr_entry { 671 struct list_head list; 672 struct rcu_head rcu; 673 union sctp_addr a; 674 __u8 state; 675 __u8 valid; 676 }; 677 678 #define SCTP_ADDRESS_TICK_DELAY 500 679 680 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 681 682 /* This structure holds lists of chunks as we are assembling for 683 * transmission. 684 */ 685 struct sctp_packet { 686 /* These are the SCTP header values (host order) for the packet. */ 687 __u16 source_port; 688 __u16 destination_port; 689 __u32 vtag; 690 691 /* This contains the payload chunks. */ 692 struct list_head chunk_list; 693 694 /* This is the overhead of the sctp and ip headers. */ 695 size_t overhead; 696 /* This is the total size of all chunks INCLUDING padding. */ 697 size_t size; 698 699 /* The packet is destined for this transport address. 700 * The function we finally use to pass down to the next lower 701 * layer lives in the transport structure. 702 */ 703 struct sctp_transport *transport; 704 705 /* pointer to the auth chunk for this packet */ 706 struct sctp_chunk *auth; 707 708 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 709 has_sack:1, /* This packet contains a SACK chunk. */ 710 has_auth:1, /* This packet contains an AUTH chunk */ 711 has_data:1, /* This packet contains at least 1 DATA chunk */ 712 ipfragok:1; /* So let ip fragment this packet */ 713 }; 714 715 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 716 struct sctp_transport *, 717 __u16 sport, __u16 dport); 718 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 719 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 720 struct sctp_chunk *, int, gfp_t); 721 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 722 struct sctp_chunk *); 723 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 724 void sctp_packet_free(struct sctp_packet *); 725 726 static inline int sctp_packet_empty(struct sctp_packet *packet) 727 { 728 return packet->size == packet->overhead; 729 } 730 731 /* This represents a remote transport address. 732 * For local transport addresses, we just use union sctp_addr. 733 * 734 * RFC2960 Section 1.4 Key Terms 735 * 736 * o Transport address: A Transport Address is traditionally defined 737 * by Network Layer address, Transport Layer protocol and Transport 738 * Layer port number. In the case of SCTP running over IP, a 739 * transport address is defined by the combination of an IP address 740 * and an SCTP port number (where SCTP is the Transport protocol). 741 * 742 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 743 * 744 * o The sender keeps a separate congestion control parameter set for 745 * each of the destination addresses it can send to (not each 746 * source-destination pair but for each destination). The parameters 747 * should decay if the address is not used for a long enough time 748 * period. 749 * 750 */ 751 struct sctp_transport { 752 /* A list of transports. */ 753 struct list_head transports; 754 struct rhash_head node; 755 756 /* Reference counting. */ 757 atomic_t refcnt; 758 /* RTO-Pending : A flag used to track if one of the DATA 759 * chunks sent to this address is currently being 760 * used to compute a RTT. If this flag is 0, 761 * the next DATA chunk sent to this destination 762 * should be used to compute a RTT and this flag 763 * should be set. Every time the RTT 764 * calculation completes (i.e. the DATA chunk 765 * is SACK'd) clear this flag. 766 */ 767 __u32 rto_pending:1, 768 769 /* 770 * hb_sent : a flag that signals that we have a pending 771 * heartbeat. 772 */ 773 hb_sent:1, 774 775 /* Is the Path MTU update pending on this tranport */ 776 pmtu_pending:1, 777 778 /* Has this transport moved the ctsn since we last sacked */ 779 sack_generation:1; 780 u32 dst_cookie; 781 782 struct flowi fl; 783 784 /* This is the peer's IP address and port. */ 785 union sctp_addr ipaddr; 786 787 /* These are the functions we call to handle LLP stuff. */ 788 struct sctp_af *af_specific; 789 790 /* Which association do we belong to? */ 791 struct sctp_association *asoc; 792 793 /* RFC2960 794 * 795 * 12.3 Per Transport Address Data 796 * 797 * For each destination transport address in the peer's 798 * address list derived from the INIT or INIT ACK chunk, a 799 * number of data elements needs to be maintained including: 800 */ 801 /* RTO : The current retransmission timeout value. */ 802 unsigned long rto; 803 804 __u32 rtt; /* This is the most recent RTT. */ 805 806 /* RTTVAR : The current RTT variation. */ 807 __u32 rttvar; 808 809 /* SRTT : The current smoothed round trip time. */ 810 __u32 srtt; 811 812 /* 813 * These are the congestion stats. 814 */ 815 /* cwnd : The current congestion window. */ 816 __u32 cwnd; /* This is the actual cwnd. */ 817 818 /* ssthresh : The current slow start threshold value. */ 819 __u32 ssthresh; 820 821 /* partial : The tracking method for increase of cwnd when in 822 * bytes acked : congestion avoidance mode (see Section 6.2.2) 823 */ 824 __u32 partial_bytes_acked; 825 826 /* Data that has been sent, but not acknowledged. */ 827 __u32 flight_size; 828 829 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 830 831 /* Destination */ 832 struct dst_entry *dst; 833 /* Source address. */ 834 union sctp_addr saddr; 835 836 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 837 * the destination address every heartbeat interval. 838 */ 839 unsigned long hbinterval; 840 841 /* SACK delay timeout */ 842 unsigned long sackdelay; 843 __u32 sackfreq; 844 845 /* When was the last time that we heard from this transport? We use 846 * this to pick new active and retran paths. 847 */ 848 ktime_t last_time_heard; 849 850 /* Last time(in jiffies) when cwnd is reduced due to the congestion 851 * indication based on ECNE chunk. 852 */ 853 unsigned long last_time_ecne_reduced; 854 855 /* This is the max_retrans value for the transport and will 856 * be initialized from the assocs value. This can be changed 857 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 858 */ 859 __u16 pathmaxrxt; 860 861 /* This is the partially failed retrans value for the transport 862 * and will be initialized from the assocs value. This can be changed 863 * using the SCTP_PEER_ADDR_THLDS socket option 864 */ 865 int pf_retrans; 866 /* PMTU : The current known path MTU. */ 867 __u32 pathmtu; 868 869 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 870 __u32 param_flags; 871 872 /* The number of times INIT has been sent on this transport. */ 873 int init_sent_count; 874 875 /* state : The current state of this destination, 876 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 877 */ 878 int state; 879 880 /* These are the error stats for this destination. */ 881 882 /* Error count : The current error count for this destination. */ 883 unsigned short error_count; 884 885 /* Per : A timer used by each destination. 886 * Destination : 887 * Timer : 888 * 889 * [Everywhere else in the text this is called T3-rtx. -ed] 890 */ 891 struct timer_list T3_rtx_timer; 892 893 /* Heartbeat timer is per destination. */ 894 struct timer_list hb_timer; 895 896 /* Timer to handle ICMP proto unreachable envets */ 897 struct timer_list proto_unreach_timer; 898 899 /* Since we're using per-destination retransmission timers 900 * (see above), we're also using per-destination "transmitted" 901 * queues. This probably ought to be a private struct 902 * accessible only within the outqueue, but it's not, yet. 903 */ 904 struct list_head transmitted; 905 906 /* We build bundle-able packets for this transport here. */ 907 struct sctp_packet packet; 908 909 /* This is the list of transports that have chunks to send. */ 910 struct list_head send_ready; 911 912 /* State information saved for SFR_CACC algorithm. The key 913 * idea in SFR_CACC is to maintain state at the sender on a 914 * per-destination basis when a changeover happens. 915 * char changeover_active; 916 * char cycling_changeover; 917 * __u32 next_tsn_at_change; 918 * char cacc_saw_newack; 919 */ 920 struct { 921 /* An unsigned integer, which stores the next TSN to be 922 * used by the sender, at the moment of changeover. 923 */ 924 __u32 next_tsn_at_change; 925 926 /* A flag which indicates the occurrence of a changeover */ 927 char changeover_active; 928 929 /* A flag which indicates whether the change of primary is 930 * the first switch to this destination address during an 931 * active switch. 932 */ 933 char cycling_changeover; 934 935 /* A temporary flag, which is used during the processing of 936 * a SACK to estimate the causative TSN(s)'s group. 937 */ 938 char cacc_saw_newack; 939 } cacc; 940 941 /* 64-bit random number sent with heartbeat. */ 942 __u64 hb_nonce; 943 944 struct rcu_head rcu; 945 }; 946 947 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 948 gfp_t); 949 void sctp_transport_set_owner(struct sctp_transport *, 950 struct sctp_association *); 951 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 952 struct sctp_sock *); 953 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 954 void sctp_transport_free(struct sctp_transport *); 955 void sctp_transport_reset_timers(struct sctp_transport *); 956 int sctp_transport_hold(struct sctp_transport *); 957 void sctp_transport_put(struct sctp_transport *); 958 void sctp_transport_update_rto(struct sctp_transport *, __u32); 959 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 960 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 961 void sctp_transport_burst_limited(struct sctp_transport *); 962 void sctp_transport_burst_reset(struct sctp_transport *); 963 unsigned long sctp_transport_timeout(struct sctp_transport *); 964 void sctp_transport_reset(struct sctp_transport *); 965 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); 966 void sctp_transport_immediate_rtx(struct sctp_transport *); 967 968 969 /* This is the structure we use to queue packets as they come into 970 * SCTP. We write packets to it and read chunks from it. 971 */ 972 struct sctp_inq { 973 /* This is actually a queue of sctp_chunk each 974 * containing a partially decoded packet. 975 */ 976 struct list_head in_chunk_list; 977 /* This is the packet which is currently off the in queue and is 978 * being worked on through the inbound chunk processing. 979 */ 980 struct sctp_chunk *in_progress; 981 982 /* This is the delayed task to finish delivering inbound 983 * messages. 984 */ 985 struct work_struct immediate; 986 }; 987 988 void sctp_inq_init(struct sctp_inq *); 989 void sctp_inq_free(struct sctp_inq *); 990 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 991 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 992 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 993 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 994 995 /* This is the structure we use to hold outbound chunks. You push 996 * chunks in and they automatically pop out the other end as bundled 997 * packets (it calls (*output_handler)()). 998 * 999 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1000 * and 8.2 of the v13 draft. 1001 * 1002 * It handles retransmissions. The connection to the timeout portion 1003 * of the state machine is through sctp_..._timeout() and timeout_handler. 1004 * 1005 * If you feed it SACKs, it will eat them. 1006 * 1007 * If you give it big chunks, it will fragment them. 1008 * 1009 * It assigns TSN's to data chunks. This happens at the last possible 1010 * instant before transmission. 1011 * 1012 * When free()'d, it empties itself out via output_handler(). 1013 */ 1014 struct sctp_outq { 1015 struct sctp_association *asoc; 1016 1017 /* Data pending that has never been transmitted. */ 1018 struct list_head out_chunk_list; 1019 1020 unsigned int out_qlen; /* Total length of queued data chunks. */ 1021 1022 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1023 unsigned int error; 1024 1025 /* These are control chunks we want to send. */ 1026 struct list_head control_chunk_list; 1027 1028 /* These are chunks that have been sacked but are above the 1029 * CTSN, or cumulative tsn ack point. 1030 */ 1031 struct list_head sacked; 1032 1033 /* Put chunks on this list to schedule them for 1034 * retransmission. 1035 */ 1036 struct list_head retransmit; 1037 1038 /* Put chunks on this list to save them for FWD TSN processing as 1039 * they were abandoned. 1040 */ 1041 struct list_head abandoned; 1042 1043 /* How many unackd bytes do we have in-flight? */ 1044 __u32 outstanding_bytes; 1045 1046 /* Are we doing fast-rtx on this queue */ 1047 char fast_rtx; 1048 1049 /* Corked? */ 1050 char cork; 1051 }; 1052 1053 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1054 void sctp_outq_teardown(struct sctp_outq *); 1055 void sctp_outq_free(struct sctp_outq*); 1056 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1057 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1058 int sctp_outq_is_empty(const struct sctp_outq *); 1059 void sctp_outq_restart(struct sctp_outq *); 1060 1061 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1062 sctp_retransmit_reason_t); 1063 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1064 int sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1065 /* Uncork and flush an outqueue. */ 1066 static inline void sctp_outq_cork(struct sctp_outq *q) 1067 { 1068 q->cork = 1; 1069 } 1070 1071 /* These bind address data fields common between endpoints and associations */ 1072 struct sctp_bind_addr { 1073 1074 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1075 * 1076 * SCTP Port: The local SCTP port number the endpoint is 1077 * bound to. 1078 */ 1079 __u16 port; 1080 1081 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1082 * 1083 * Address List: The list of IP addresses that this instance 1084 * has bound. This information is passed to one's 1085 * peer(s) in INIT and INIT ACK chunks. 1086 */ 1087 struct list_head address_list; 1088 }; 1089 1090 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1091 void sctp_bind_addr_free(struct sctp_bind_addr *); 1092 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1093 const struct sctp_bind_addr *src, 1094 sctp_scope_t scope, gfp_t gfp, 1095 int flags); 1096 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1097 const struct sctp_bind_addr *src, 1098 gfp_t gfp); 1099 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1100 int new_size, __u8 addr_state, gfp_t gfp); 1101 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1102 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1103 struct sctp_sock *); 1104 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1105 struct sctp_sock *, struct sctp_sock *); 1106 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1107 const union sctp_addr *addr); 1108 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1109 const union sctp_addr *addrs, 1110 int addrcnt, 1111 struct sctp_sock *opt); 1112 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1113 int *addrs_len, 1114 gfp_t gfp); 1115 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1116 __u16 port, gfp_t gfp); 1117 1118 sctp_scope_t sctp_scope(const union sctp_addr *); 1119 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1120 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1121 int sctp_is_ep_boundall(struct sock *sk); 1122 1123 1124 /* What type of endpoint? */ 1125 typedef enum { 1126 SCTP_EP_TYPE_SOCKET, 1127 SCTP_EP_TYPE_ASSOCIATION, 1128 } sctp_endpoint_type_t; 1129 1130 /* 1131 * A common base class to bridge the implmentation view of a 1132 * socket (usually listening) endpoint versus an association's 1133 * local endpoint. 1134 * This common structure is useful for several purposes: 1135 * 1) Common interface for lookup routines. 1136 * a) Subfunctions work for either endpoint or association 1137 * b) Single interface to lookup allows hiding the lookup lock rather 1138 * than acquiring it externally. 1139 * 2) Common interface for the inbound chunk handling/state machine. 1140 * 3) Common object handling routines for reference counting, etc. 1141 * 4) Disentangle association lookup from endpoint lookup, where we 1142 * do not have to find our endpoint to find our association. 1143 * 1144 */ 1145 1146 struct sctp_ep_common { 1147 /* Fields to help us manage our entries in the hash tables. */ 1148 struct hlist_node node; 1149 int hashent; 1150 1151 /* Runtime type information. What kind of endpoint is this? */ 1152 sctp_endpoint_type_t type; 1153 1154 /* Some fields to help us manage this object. 1155 * refcnt - Reference count access to this object. 1156 * dead - Do not attempt to use this object. 1157 */ 1158 atomic_t refcnt; 1159 bool dead; 1160 1161 /* What socket does this endpoint belong to? */ 1162 struct sock *sk; 1163 1164 /* This is where we receive inbound chunks. */ 1165 struct sctp_inq inqueue; 1166 1167 /* This substructure includes the defining parameters of the 1168 * endpoint: 1169 * bind_addr.port is our shared port number. 1170 * bind_addr.address_list is our set of local IP addresses. 1171 */ 1172 struct sctp_bind_addr bind_addr; 1173 }; 1174 1175 1176 /* RFC Section 1.4 Key Terms 1177 * 1178 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1179 * multi-homed host, an SCTP endpoint is represented to its peers as a 1180 * combination of a set of eligible destination transport addresses to 1181 * which SCTP packets can be sent and a set of eligible source 1182 * transport addresses from which SCTP packets can be received. 1183 * All transport addresses used by an SCTP endpoint must use the 1184 * same port number, but can use multiple IP addresses. A transport 1185 * address used by an SCTP endpoint must not be used by another 1186 * SCTP endpoint. In other words, a transport address is unique 1187 * to an SCTP endpoint. 1188 * 1189 * From an implementation perspective, each socket has one of these. 1190 * A TCP-style socket will have exactly one association on one of 1191 * these. An UDP-style socket will have multiple associations hanging 1192 * off one of these. 1193 */ 1194 1195 struct sctp_endpoint { 1196 /* Common substructure for endpoint and association. */ 1197 struct sctp_ep_common base; 1198 1199 /* Associations: A list of current associations and mappings 1200 * to the data consumers for each association. This 1201 * may be in the form of a hash table or other 1202 * implementation dependent structure. The data 1203 * consumers may be process identification 1204 * information such as file descriptors, named pipe 1205 * pointer, or table pointers dependent on how SCTP 1206 * is implemented. 1207 */ 1208 /* This is really a list of struct sctp_association entries. */ 1209 struct list_head asocs; 1210 1211 /* Secret Key: A secret key used by this endpoint to compute 1212 * the MAC. This SHOULD be a cryptographic quality 1213 * random number with a sufficient length. 1214 * Discussion in [RFC1750] can be helpful in 1215 * selection of the key. 1216 */ 1217 __u8 secret_key[SCTP_SECRET_SIZE]; 1218 1219 /* digest: This is a digest of the sctp cookie. This field is 1220 * only used on the receive path when we try to validate 1221 * that the cookie has not been tampered with. We put 1222 * this here so we pre-allocate this once and can re-use 1223 * on every receive. 1224 */ 1225 __u8 *digest; 1226 1227 /* sendbuf acct. policy. */ 1228 __u32 sndbuf_policy; 1229 1230 /* rcvbuf acct. policy. */ 1231 __u32 rcvbuf_policy; 1232 1233 /* SCTP AUTH: array of the HMACs that will be allocated 1234 * we need this per association so that we don't serialize 1235 */ 1236 struct crypto_shash **auth_hmacs; 1237 1238 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1239 struct sctp_hmac_algo_param *auth_hmacs_list; 1240 1241 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1242 struct sctp_chunks_param *auth_chunk_list; 1243 1244 /* SCTP-AUTH: endpoint shared keys */ 1245 struct list_head endpoint_shared_keys; 1246 __u16 active_key_id; 1247 __u8 auth_enable; 1248 }; 1249 1250 /* Recover the outter endpoint structure. */ 1251 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1252 { 1253 struct sctp_endpoint *ep; 1254 1255 ep = container_of(base, struct sctp_endpoint, base); 1256 return ep; 1257 } 1258 1259 /* These are function signatures for manipulating endpoints. */ 1260 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1261 void sctp_endpoint_free(struct sctp_endpoint *); 1262 void sctp_endpoint_put(struct sctp_endpoint *); 1263 void sctp_endpoint_hold(struct sctp_endpoint *); 1264 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1265 struct sctp_association *sctp_endpoint_lookup_assoc( 1266 const struct sctp_endpoint *ep, 1267 const union sctp_addr *paddr, 1268 struct sctp_transport **); 1269 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1270 const union sctp_addr *); 1271 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1272 struct net *, const union sctp_addr *); 1273 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1274 const union sctp_addr *paddr); 1275 1276 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1277 const struct sctp_association *asoc, 1278 sctp_cid_t, sctp_init_chunk_t *peer_init, 1279 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1280 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1281 const union sctp_addr *peer, 1282 sctp_init_chunk_t *init, gfp_t gfp); 1283 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1284 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1285 1286 struct sctp_inithdr_host { 1287 __u32 init_tag; 1288 __u32 a_rwnd; 1289 __u16 num_outbound_streams; 1290 __u16 num_inbound_streams; 1291 __u32 initial_tsn; 1292 }; 1293 1294 /* SCTP_GET_ASSOC_STATS counters */ 1295 struct sctp_priv_assoc_stats { 1296 /* Maximum observed rto in the association during subsequent 1297 * observations. Value is set to 0 if no RTO measurement took place 1298 * The transport where the max_rto was observed is returned in 1299 * obs_rto_ipaddr 1300 */ 1301 struct sockaddr_storage obs_rto_ipaddr; 1302 __u64 max_obs_rto; 1303 /* Total In and Out SACKs received and sent */ 1304 __u64 isacks; 1305 __u64 osacks; 1306 /* Total In and Out packets received and sent */ 1307 __u64 opackets; 1308 __u64 ipackets; 1309 /* Total retransmitted chunks */ 1310 __u64 rtxchunks; 1311 /* TSN received > next expected */ 1312 __u64 outofseqtsns; 1313 /* Duplicate Chunks received */ 1314 __u64 idupchunks; 1315 /* Gap Ack Blocks received */ 1316 __u64 gapcnt; 1317 /* Unordered data chunks sent and received */ 1318 __u64 ouodchunks; 1319 __u64 iuodchunks; 1320 /* Ordered data chunks sent and received */ 1321 __u64 oodchunks; 1322 __u64 iodchunks; 1323 /* Control chunks sent and received */ 1324 __u64 octrlchunks; 1325 __u64 ictrlchunks; 1326 }; 1327 1328 /* RFC2960 1329 * 1330 * 12. Recommended Transmission Control Block (TCB) Parameters 1331 * 1332 * This section details a recommended set of parameters that should 1333 * be contained within the TCB for an implementation. This section is 1334 * for illustrative purposes and should not be deemed as requirements 1335 * on an implementation or as an exhaustive list of all parameters 1336 * inside an SCTP TCB. Each implementation may need its own additional 1337 * parameters for optimization. 1338 */ 1339 1340 1341 /* Here we have information about each individual association. */ 1342 struct sctp_association { 1343 1344 /* A base structure common to endpoint and association. 1345 * In this context, it represents the associations's view 1346 * of the local endpoint of the association. 1347 */ 1348 struct sctp_ep_common base; 1349 1350 /* Associations on the same socket. */ 1351 struct list_head asocs; 1352 1353 /* association id. */ 1354 sctp_assoc_t assoc_id; 1355 1356 /* This is our parent endpoint. */ 1357 struct sctp_endpoint *ep; 1358 1359 /* These are those association elements needed in the cookie. */ 1360 struct sctp_cookie c; 1361 1362 /* This is all information about our peer. */ 1363 struct { 1364 /* transport_addr_list 1365 * 1366 * Peer : A list of SCTP transport addresses that the 1367 * Transport : peer is bound to. This information is derived 1368 * Address : from the INIT or INIT ACK and is used to 1369 * List : associate an inbound packet with a given 1370 * : association. Normally this information is 1371 * : hashed or keyed for quick lookup and access 1372 * : of the TCB. 1373 * : The list is also initialized with the list 1374 * : of addresses passed with the sctp_connectx() 1375 * : call. 1376 * 1377 * It is a list of SCTP_transport's. 1378 */ 1379 struct list_head transport_addr_list; 1380 1381 /* rwnd 1382 * 1383 * Peer Rwnd : Current calculated value of the peer's rwnd. 1384 */ 1385 __u32 rwnd; 1386 1387 /* transport_count 1388 * 1389 * Peer : A count of the number of peer addresses 1390 * Transport : in the Peer Transport Address List. 1391 * Address : 1392 * Count : 1393 */ 1394 __u16 transport_count; 1395 1396 /* port 1397 * The transport layer port number. 1398 */ 1399 __u16 port; 1400 1401 /* primary_path 1402 * 1403 * Primary : This is the current primary destination 1404 * Path : transport address of the peer endpoint. It 1405 * : may also specify a source transport address 1406 * : on this endpoint. 1407 * 1408 * All of these paths live on transport_addr_list. 1409 * 1410 * At the bakeoffs, we discovered that the intent of 1411 * primaryPath is that it only changes when the ULP 1412 * asks to have it changed. We add the activePath to 1413 * designate the connection we are currently using to 1414 * transmit new data and most control chunks. 1415 */ 1416 struct sctp_transport *primary_path; 1417 1418 /* Cache the primary path address here, when we 1419 * need a an address for msg_name. 1420 */ 1421 union sctp_addr primary_addr; 1422 1423 /* active_path 1424 * The path that we are currently using to 1425 * transmit new data and most control chunks. 1426 */ 1427 struct sctp_transport *active_path; 1428 1429 /* retran_path 1430 * 1431 * RFC2960 6.4 Multi-homed SCTP Endpoints 1432 * ... 1433 * Furthermore, when its peer is multi-homed, an 1434 * endpoint SHOULD try to retransmit a chunk to an 1435 * active destination transport address that is 1436 * different from the last destination address to 1437 * which the DATA chunk was sent. 1438 */ 1439 struct sctp_transport *retran_path; 1440 1441 /* Pointer to last transport I have sent on. */ 1442 struct sctp_transport *last_sent_to; 1443 1444 /* This is the last transport I have received DATA on. */ 1445 struct sctp_transport *last_data_from; 1446 1447 /* 1448 * Mapping An array of bits or bytes indicating which out of 1449 * Array order TSN's have been received (relative to the 1450 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1451 * order packets have been received, this array 1452 * will be set to all zero. This structure may be 1453 * in the form of a circular buffer or bit array. 1454 * 1455 * Last Rcvd : This is the last TSN received in 1456 * TSN : sequence. This value is set initially by 1457 * : taking the peer's Initial TSN, received in 1458 * : the INIT or INIT ACK chunk, and subtracting 1459 * : one from it. 1460 * 1461 * Throughout most of the specification this is called the 1462 * "Cumulative TSN ACK Point". In this case, we 1463 * ignore the advice in 12.2 in favour of the term 1464 * used in the bulk of the text. This value is hidden 1465 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1466 */ 1467 struct sctp_tsnmap tsn_map; 1468 1469 /* This mask is used to disable sending the ASCONF chunk 1470 * with specified parameter to peer. 1471 */ 1472 __be16 addip_disabled_mask; 1473 1474 /* These are capabilities which our peer advertised. */ 1475 __u8 ecn_capable:1, /* Can peer do ECN? */ 1476 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1477 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1478 hostname_address:1, /* Peer understands DNS addresses? */ 1479 asconf_capable:1, /* Does peer support ADDIP? */ 1480 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1481 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1482 1483 /* sack_needed : This flag indicates if the next received 1484 * : packet is to be responded to with a 1485 * : SACK. This is initialized to 0. When a packet 1486 * : is received sack_cnt is incremented. If this value 1487 * : reaches 2 or more, a SACK is sent and the 1488 * : value is reset to 0. Note: This is used only 1489 * : when no DATA chunks are received out of 1490 * : order. When DATA chunks are out of order, 1491 * : SACK's are not delayed (see Section 6). 1492 */ 1493 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1494 sack_generation:1, 1495 zero_window_announced:1; 1496 __u32 sack_cnt; 1497 1498 __u32 adaptation_ind; /* Adaptation Code point. */ 1499 1500 struct sctp_inithdr_host i; 1501 void *cookie; 1502 int cookie_len; 1503 1504 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1505 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1506 * Initial TSN Value minus 1 1507 */ 1508 __u32 addip_serial; 1509 1510 /* SCTP-AUTH: We need to know pears random number, hmac list 1511 * and authenticated chunk list. All that is part of the 1512 * cookie and these are just pointers to those locations 1513 */ 1514 sctp_random_param_t *peer_random; 1515 sctp_chunks_param_t *peer_chunks; 1516 sctp_hmac_algo_param_t *peer_hmacs; 1517 } peer; 1518 1519 /* State : A state variable indicating what state the 1520 * : association is in, i.e. COOKIE-WAIT, 1521 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1522 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1523 * 1524 * Note: No "CLOSED" state is illustrated since if a 1525 * association is "CLOSED" its TCB SHOULD be removed. 1526 * 1527 * In this implementation we DO have a CLOSED 1528 * state which is used during initiation and shutdown. 1529 * 1530 * State takes values from SCTP_STATE_*. 1531 */ 1532 sctp_state_t state; 1533 1534 /* Overall : The overall association error count. 1535 * Error Count : [Clear this any time I get something.] 1536 */ 1537 int overall_error_count; 1538 1539 /* The cookie life I award for any cookie. */ 1540 ktime_t cookie_life; 1541 1542 /* These are the association's initial, max, and min RTO values. 1543 * These values will be initialized by system defaults, but can 1544 * be modified via the SCTP_RTOINFO socket option. 1545 */ 1546 unsigned long rto_initial; 1547 unsigned long rto_max; 1548 unsigned long rto_min; 1549 1550 /* Maximum number of new data packets that can be sent in a burst. */ 1551 int max_burst; 1552 1553 /* This is the max_retrans value for the association. This value will 1554 * be initialized initialized from system defaults, but can be 1555 * modified by the SCTP_ASSOCINFO socket option. 1556 */ 1557 int max_retrans; 1558 1559 /* This is the partially failed retrans value for the transport 1560 * and will be initialized from the assocs value. This can be 1561 * changed using the SCTP_PEER_ADDR_THLDS socket option 1562 */ 1563 int pf_retrans; 1564 1565 /* Maximum number of times the endpoint will retransmit INIT */ 1566 __u16 max_init_attempts; 1567 1568 /* How many times have we resent an INIT? */ 1569 __u16 init_retries; 1570 1571 /* The largest timeout or RTO value to use in attempting an INIT */ 1572 unsigned long max_init_timeo; 1573 1574 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1575 * the destination address every heartbeat interval. This value 1576 * will be inherited by all new transports. 1577 */ 1578 unsigned long hbinterval; 1579 1580 /* This is the max_retrans value for new transports in the 1581 * association. 1582 */ 1583 __u16 pathmaxrxt; 1584 1585 /* Flag that path mtu update is pending */ 1586 __u8 pmtu_pending; 1587 1588 /* Association : The smallest PMTU discovered for all of the 1589 * PMTU : peer's transport addresses. 1590 */ 1591 __u32 pathmtu; 1592 1593 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1594 __u32 param_flags; 1595 1596 __u32 sackfreq; 1597 /* SACK delay timeout */ 1598 unsigned long sackdelay; 1599 1600 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1601 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1602 1603 /* Transport to which SHUTDOWN chunk was last sent. */ 1604 struct sctp_transport *shutdown_last_sent_to; 1605 1606 /* Transport to which INIT chunk was last sent. */ 1607 struct sctp_transport *init_last_sent_to; 1608 1609 /* How many times have we resent a SHUTDOWN */ 1610 int shutdown_retries; 1611 1612 /* Next TSN : The next TSN number to be assigned to a new 1613 * : DATA chunk. This is sent in the INIT or INIT 1614 * : ACK chunk to the peer and incremented each 1615 * : time a DATA chunk is assigned a TSN 1616 * : (normally just prior to transmit or during 1617 * : fragmentation). 1618 */ 1619 __u32 next_tsn; 1620 1621 /* 1622 * Last Rcvd : This is the last TSN received in sequence. This value 1623 * TSN : is set initially by taking the peer's Initial TSN, 1624 * : received in the INIT or INIT ACK chunk, and 1625 * : subtracting one from it. 1626 * 1627 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1628 */ 1629 1630 __u32 ctsn_ack_point; 1631 1632 /* PR-SCTP Advanced.Peer.Ack.Point */ 1633 __u32 adv_peer_ack_point; 1634 1635 /* Highest TSN that is acknowledged by incoming SACKs. */ 1636 __u32 highest_sacked; 1637 1638 /* TSN marking the fast recovery exit point */ 1639 __u32 fast_recovery_exit; 1640 1641 /* Flag to track the current fast recovery state */ 1642 __u8 fast_recovery; 1643 1644 /* The number of unacknowledged data chunks. Reported through 1645 * the SCTP_STATUS sockopt. 1646 */ 1647 __u16 unack_data; 1648 1649 /* The total number of data chunks that we've had to retransmit 1650 * as the result of a T3 timer expiration 1651 */ 1652 __u32 rtx_data_chunks; 1653 1654 /* This is the association's receive buffer space. This value is used 1655 * to set a_rwnd field in an INIT or a SACK chunk. 1656 */ 1657 __u32 rwnd; 1658 1659 /* This is the last advertised value of rwnd over a SACK chunk. */ 1660 __u32 a_rwnd; 1661 1662 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1663 * to slop over a maximum of the association's frag_point. 1664 */ 1665 __u32 rwnd_over; 1666 1667 /* Keeps treack of rwnd pressure. This happens when we have 1668 * a window, but not recevie buffer (i.e small packets). This one 1669 * is releases slowly (1 PMTU at a time ). 1670 */ 1671 __u32 rwnd_press; 1672 1673 /* This is the sndbuf size in use for the association. 1674 * This corresponds to the sndbuf size for the association, 1675 * as specified in the sk->sndbuf. 1676 */ 1677 int sndbuf_used; 1678 1679 /* This is the amount of memory that this association has allocated 1680 * in the receive path at any given time. 1681 */ 1682 atomic_t rmem_alloc; 1683 1684 /* This is the wait queue head for send requests waiting on 1685 * the association sndbuf space. 1686 */ 1687 wait_queue_head_t wait; 1688 1689 /* The message size at which SCTP fragmentation will occur. */ 1690 __u32 frag_point; 1691 __u32 user_frag; 1692 1693 /* Counter used to count INIT errors. */ 1694 int init_err_counter; 1695 1696 /* Count the number of INIT cycles (for doubling timeout). */ 1697 int init_cycle; 1698 1699 /* Default send parameters. */ 1700 __u16 default_stream; 1701 __u16 default_flags; 1702 __u32 default_ppid; 1703 __u32 default_context; 1704 __u32 default_timetolive; 1705 1706 /* Default receive parameters */ 1707 __u32 default_rcv_context; 1708 1709 /* This tracks outbound ssn for a given stream. */ 1710 struct sctp_ssnmap *ssnmap; 1711 1712 /* All outbound chunks go through this structure. */ 1713 struct sctp_outq outqueue; 1714 1715 /* A smart pipe that will handle reordering and fragmentation, 1716 * as well as handle passing events up to the ULP. 1717 */ 1718 struct sctp_ulpq ulpq; 1719 1720 /* Last TSN that caused an ECNE Chunk to be sent. */ 1721 __u32 last_ecne_tsn; 1722 1723 /* Last TSN that caused a CWR Chunk to be sent. */ 1724 __u32 last_cwr_tsn; 1725 1726 /* How many duplicated TSNs have we seen? */ 1727 int numduptsns; 1728 1729 /* These are to support 1730 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1731 * and Enforcement of Flow and Message Limits" 1732 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1733 * or "ADDIP" for short. 1734 */ 1735 1736 1737 1738 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1739 * 1740 * R1) One and only one ASCONF Chunk MAY be in transit and 1741 * unacknowledged at any one time. If a sender, after sending 1742 * an ASCONF chunk, decides it needs to transfer another 1743 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1744 * returns from the previous ASCONF Chunk before sending a 1745 * subsequent ASCONF. Note this restriction binds each side, 1746 * so at any time two ASCONF may be in-transit on any given 1747 * association (one sent from each endpoint). 1748 * 1749 * [This is our one-and-only-one ASCONF in flight. If we do 1750 * not have an ASCONF in flight, this is NULL.] 1751 */ 1752 struct sctp_chunk *addip_last_asconf; 1753 1754 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1755 * 1756 * This is needed to implement itmes E1 - E4 of the updated 1757 * spec. Here is the justification: 1758 * 1759 * Since the peer may bundle multiple ASCONF chunks toward us, 1760 * we now need the ability to cache multiple ACKs. The section 1761 * describes in detail how they are cached and cleaned up. 1762 */ 1763 struct list_head asconf_ack_list; 1764 1765 /* These ASCONF chunks are waiting to be sent. 1766 * 1767 * These chunaks can't be pushed to outqueue until receiving 1768 * ASCONF_ACK for the previous ASCONF indicated by 1769 * addip_last_asconf, so as to guarantee that only one ASCONF 1770 * is in flight at any time. 1771 * 1772 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1773 * 1774 * In defining the ASCONF Chunk transfer procedures, it is 1775 * essential that these transfers MUST NOT cause congestion 1776 * within the network. To achieve this, we place these 1777 * restrictions on the transfer of ASCONF Chunks: 1778 * 1779 * R1) One and only one ASCONF Chunk MAY be in transit and 1780 * unacknowledged at any one time. If a sender, after sending 1781 * an ASCONF chunk, decides it needs to transfer another 1782 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1783 * returns from the previous ASCONF Chunk before sending a 1784 * subsequent ASCONF. Note this restriction binds each side, 1785 * so at any time two ASCONF may be in-transit on any given 1786 * association (one sent from each endpoint). 1787 * 1788 * 1789 * [I really think this is EXACTLY the sort of intelligence 1790 * which already resides in sctp_outq. Please move this 1791 * queue and its supporting logic down there. --piggy] 1792 */ 1793 struct list_head addip_chunk_list; 1794 1795 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1796 * 1797 * A2) A serial number should be assigned to the Chunk. The 1798 * serial number SHOULD be a monotonically increasing 1799 * number. The serial number SHOULD be initialized at 1800 * the start of the association to the same value as the 1801 * Initial TSN and every time a new ASCONF chunk is created 1802 * it is incremented by one after assigning the serial number 1803 * to the newly created chunk. 1804 * 1805 * ADDIP 1806 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1807 * 1808 * Serial Number : 32 bits (unsigned integer) 1809 * 1810 * This value represents a Serial Number for the ASCONF 1811 * Chunk. The valid range of Serial Number is from 0 to 1812 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1813 * after reaching 4294967295. 1814 */ 1815 __u32 addip_serial; 1816 int src_out_of_asoc_ok; 1817 union sctp_addr *asconf_addr_del_pending; 1818 struct sctp_transport *new_transport; 1819 1820 /* SCTP AUTH: list of the endpoint shared keys. These 1821 * keys are provided out of band by the user applicaton 1822 * and can't change during the lifetime of the association 1823 */ 1824 struct list_head endpoint_shared_keys; 1825 1826 /* SCTP AUTH: 1827 * The current generated assocaition shared key (secret) 1828 */ 1829 struct sctp_auth_bytes *asoc_shared_key; 1830 1831 /* SCTP AUTH: hmac id of the first peer requested algorithm 1832 * that we support. 1833 */ 1834 __u16 default_hmac_id; 1835 1836 __u16 active_key_id; 1837 1838 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1839 temp:1; /* Is it a temporary association? */ 1840 1841 struct sctp_priv_assoc_stats stats; 1842 }; 1843 1844 1845 /* An eyecatcher for determining if we are really looking at an 1846 * association data structure. 1847 */ 1848 enum { 1849 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1850 }; 1851 1852 /* Recover the outter association structure. */ 1853 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1854 { 1855 struct sctp_association *asoc; 1856 1857 asoc = container_of(base, struct sctp_association, base); 1858 return asoc; 1859 } 1860 1861 /* These are function signatures for manipulating associations. */ 1862 1863 1864 struct sctp_association * 1865 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1866 sctp_scope_t scope, gfp_t gfp); 1867 void sctp_association_free(struct sctp_association *); 1868 void sctp_association_put(struct sctp_association *); 1869 void sctp_association_hold(struct sctp_association *); 1870 1871 struct sctp_transport *sctp_assoc_choose_alter_transport( 1872 struct sctp_association *, struct sctp_transport *); 1873 void sctp_assoc_update_retran_path(struct sctp_association *); 1874 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1875 const union sctp_addr *); 1876 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1877 const union sctp_addr *laddr); 1878 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1879 const union sctp_addr *address, 1880 const gfp_t gfp, 1881 const int peer_state); 1882 void sctp_assoc_del_peer(struct sctp_association *asoc, 1883 const union sctp_addr *addr); 1884 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1885 struct sctp_transport *peer); 1886 void sctp_assoc_control_transport(struct sctp_association *, 1887 struct sctp_transport *, 1888 sctp_transport_cmd_t, sctp_sn_error_t); 1889 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1890 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1891 struct net *, 1892 const union sctp_addr *, 1893 const union sctp_addr *); 1894 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1895 void sctp_assoc_update(struct sctp_association *old, 1896 struct sctp_association *new); 1897 1898 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1899 1900 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *); 1901 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1902 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1903 void sctp_assoc_set_primary(struct sctp_association *, 1904 struct sctp_transport *); 1905 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1906 struct sctp_transport *); 1907 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1908 sctp_scope_t, gfp_t); 1909 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1910 struct sctp_cookie*, 1911 gfp_t gfp); 1912 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1913 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1914 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1915 const struct sctp_association *asoc, 1916 __be32 serial); 1917 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1918 1919 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1920 const union sctp_addr *ss2); 1921 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1922 1923 /* A convenience structure to parse out SCTP specific CMSGs. */ 1924 typedef struct sctp_cmsgs { 1925 struct sctp_initmsg *init; 1926 struct sctp_sndrcvinfo *srinfo; 1927 struct sctp_sndinfo *sinfo; 1928 } sctp_cmsgs_t; 1929 1930 /* Structure for tracking memory objects */ 1931 typedef struct { 1932 char *label; 1933 atomic_t *counter; 1934 } sctp_dbg_objcnt_entry_t; 1935 1936 #endif /* __sctp_structs_h__ */ 1937