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_hash; 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_hash *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 __u8 nodelay; 214 __u8 disable_fragments; 215 __u8 v4mapped; 216 __u8 frag_interleave; 217 __u32 adaptation_ind; 218 __u32 pd_point; 219 __u8 recvrcvinfo; 220 __u8 recvnxtinfo; 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_free(struct sctp_datamsg *); 539 void sctp_datamsg_put(struct sctp_datamsg *); 540 void sctp_chunk_fail(struct sctp_chunk *, int error); 541 int sctp_chunk_abandoned(struct sctp_chunk *); 542 543 /* RFC2960 1.4 Key Terms 544 * 545 * o Chunk: A unit of information within an SCTP packet, consisting of 546 * a chunk header and chunk-specific content. 547 * 548 * As a matter of convenience, we remember the SCTP common header for 549 * each chunk as well as a few other header pointers... 550 */ 551 struct sctp_chunk { 552 struct list_head list; 553 554 atomic_t refcnt; 555 556 /* This is our link to the per-transport transmitted list. */ 557 struct list_head transmitted_list; 558 559 /* This field is used by chunks that hold fragmented data. 560 * For the first fragment this is the list that holds the rest of 561 * fragments. For the remaining fragments, this is the link to the 562 * frag_list maintained in the first fragment. 563 */ 564 struct list_head frag_list; 565 566 /* This points to the sk_buff containing the actual data. */ 567 struct sk_buff *skb; 568 569 /* These are the SCTP headers by reverse order in a packet. 570 * Note that some of these may happen more than once. In that 571 * case, we point at the "current" one, whatever that means 572 * for that level of header. 573 */ 574 575 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 576 union sctp_params param_hdr; 577 union { 578 __u8 *v; 579 struct sctp_datahdr *data_hdr; 580 struct sctp_inithdr *init_hdr; 581 struct sctp_sackhdr *sack_hdr; 582 struct sctp_heartbeathdr *hb_hdr; 583 struct sctp_sender_hb_info *hbs_hdr; 584 struct sctp_shutdownhdr *shutdown_hdr; 585 struct sctp_signed_cookie *cookie_hdr; 586 struct sctp_ecnehdr *ecne_hdr; 587 struct sctp_cwrhdr *ecn_cwr_hdr; 588 struct sctp_errhdr *err_hdr; 589 struct sctp_addiphdr *addip_hdr; 590 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 591 struct sctp_authhdr *auth_hdr; 592 } subh; 593 594 __u8 *chunk_end; 595 596 struct sctp_chunkhdr *chunk_hdr; 597 struct sctphdr *sctp_hdr; 598 599 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 600 struct sctp_sndrcvinfo sinfo; 601 602 /* Which association does this belong to? */ 603 struct sctp_association *asoc; 604 605 /* What endpoint received this chunk? */ 606 struct sctp_ep_common *rcvr; 607 608 /* We fill this in if we are calculating RTT. */ 609 unsigned long sent_at; 610 611 /* What is the origin IP address for this chunk? */ 612 union sctp_addr source; 613 /* Destination address for this chunk. */ 614 union sctp_addr dest; 615 616 /* For outbound message, track all fragments for SEND_FAILED. */ 617 struct sctp_datamsg *msg; 618 619 /* For an inbound chunk, this tells us where it came from. 620 * For an outbound chunk, it tells us where we'd like it to 621 * go. It is NULL if we have no preference. 622 */ 623 struct sctp_transport *transport; 624 625 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 626 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 627 * spec violates the principle premis that all chunks are processed 628 * in order. 629 */ 630 struct sk_buff *auth_chunk; 631 632 #define SCTP_CAN_FRTX 0x0 633 #define SCTP_NEED_FRTX 0x1 634 #define SCTP_DONT_FRTX 0x2 635 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 636 resent:1, /* Has this chunk ever been resent. */ 637 has_tsn:1, /* Does this chunk have a TSN yet? */ 638 has_ssn:1, /* Does this chunk have a SSN yet? */ 639 singleton:1, /* Only chunk in the packet? */ 640 end_of_packet:1, /* Last chunk in the packet? */ 641 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 642 pdiscard:1, /* Discard the whole packet now? */ 643 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 644 data_accepted:1, /* At least 1 chunk accepted */ 645 auth:1, /* IN: was auth'ed | OUT: needs auth */ 646 has_asconf:1, /* IN: have seen an asconf before */ 647 tsn_missing_report:2, /* Data chunk missing counter. */ 648 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 649 }; 650 651 void sctp_chunk_hold(struct sctp_chunk *); 652 void sctp_chunk_put(struct sctp_chunk *); 653 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 654 struct iov_iter *from); 655 void sctp_chunk_free(struct sctp_chunk *); 656 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 657 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 658 const struct sctp_association *, 659 struct sock *); 660 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 661 union sctp_addr *); 662 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 663 664 enum { 665 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 666 SCTP_ADDR_SRC, /* address can be used as source */ 667 SCTP_ADDR_DEL, /* address about to be deleted */ 668 }; 669 670 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 671 struct sctp_sockaddr_entry { 672 struct list_head list; 673 struct rcu_head rcu; 674 union sctp_addr a; 675 __u8 state; 676 __u8 valid; 677 }; 678 679 #define SCTP_ADDRESS_TICK_DELAY 500 680 681 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 682 683 /* This structure holds lists of chunks as we are assembling for 684 * transmission. 685 */ 686 struct sctp_packet { 687 /* These are the SCTP header values (host order) for the packet. */ 688 __u16 source_port; 689 __u16 destination_port; 690 __u32 vtag; 691 692 /* This contains the payload chunks. */ 693 struct list_head chunk_list; 694 695 /* This is the overhead of the sctp and ip headers. */ 696 size_t overhead; 697 /* This is the total size of all chunks INCLUDING padding. */ 698 size_t size; 699 700 /* The packet is destined for this transport address. 701 * The function we finally use to pass down to the next lower 702 * layer lives in the transport structure. 703 */ 704 struct sctp_transport *transport; 705 706 /* pointer to the auth chunk for this packet */ 707 struct sctp_chunk *auth; 708 709 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 710 has_sack:1, /* This packet contains a SACK chunk. */ 711 has_auth:1, /* This packet contains an AUTH chunk */ 712 has_data:1, /* This packet contains at least 1 DATA chunk */ 713 ipfragok:1; /* So let ip fragment this packet */ 714 }; 715 716 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 717 struct sctp_transport *, 718 __u16 sport, __u16 dport); 719 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 720 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 721 struct sctp_chunk *, int); 722 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 723 struct sctp_chunk *); 724 int sctp_packet_transmit(struct sctp_packet *); 725 void sctp_packet_free(struct sctp_packet *); 726 727 static inline int sctp_packet_empty(struct sctp_packet *packet) 728 { 729 return packet->size == packet->overhead; 730 } 731 732 /* This represents a remote transport address. 733 * For local transport addresses, we just use union sctp_addr. 734 * 735 * RFC2960 Section 1.4 Key Terms 736 * 737 * o Transport address: A Transport Address is traditionally defined 738 * by Network Layer address, Transport Layer protocol and Transport 739 * Layer port number. In the case of SCTP running over IP, a 740 * transport address is defined by the combination of an IP address 741 * and an SCTP port number (where SCTP is the Transport protocol). 742 * 743 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 744 * 745 * o The sender keeps a separate congestion control parameter set for 746 * each of the destination addresses it can send to (not each 747 * source-destination pair but for each destination). The parameters 748 * should decay if the address is not used for a long enough time 749 * period. 750 * 751 */ 752 struct sctp_transport { 753 /* A list of transports. */ 754 struct list_head transports; 755 struct rhash_head node; 756 757 /* Reference counting. */ 758 atomic_t refcnt; 759 /* RTO-Pending : A flag used to track if one of the DATA 760 * chunks sent to this address is currently being 761 * used to compute a RTT. If this flag is 0, 762 * the next DATA chunk sent to this destination 763 * should be used to compute a RTT and this flag 764 * should be set. Every time the RTT 765 * calculation completes (i.e. the DATA chunk 766 * is SACK'd) clear this flag. 767 */ 768 __u32 rto_pending:1, 769 770 /* 771 * hb_sent : a flag that signals that we have a pending 772 * heartbeat. 773 */ 774 hb_sent:1, 775 776 /* Is the Path MTU update pending on this tranport */ 777 pmtu_pending:1, 778 779 /* Has this transport moved the ctsn since we last sacked */ 780 sack_generation:1; 781 u32 dst_cookie; 782 783 struct flowi fl; 784 785 /* This is the peer's IP address and port. */ 786 union sctp_addr ipaddr; 787 788 /* These are the functions we call to handle LLP stuff. */ 789 struct sctp_af *af_specific; 790 791 /* Which association do we belong to? */ 792 struct sctp_association *asoc; 793 794 /* RFC2960 795 * 796 * 12.3 Per Transport Address Data 797 * 798 * For each destination transport address in the peer's 799 * address list derived from the INIT or INIT ACK chunk, a 800 * number of data elements needs to be maintained including: 801 */ 802 /* RTO : The current retransmission timeout value. */ 803 unsigned long rto; 804 805 __u32 rtt; /* This is the most recent RTT. */ 806 807 /* RTTVAR : The current RTT variation. */ 808 __u32 rttvar; 809 810 /* SRTT : The current smoothed round trip time. */ 811 __u32 srtt; 812 813 /* 814 * These are the congestion stats. 815 */ 816 /* cwnd : The current congestion window. */ 817 __u32 cwnd; /* This is the actual cwnd. */ 818 819 /* ssthresh : The current slow start threshold value. */ 820 __u32 ssthresh; 821 822 /* partial : The tracking method for increase of cwnd when in 823 * bytes acked : congestion avoidance mode (see Section 6.2.2) 824 */ 825 __u32 partial_bytes_acked; 826 827 /* Data that has been sent, but not acknowledged. */ 828 __u32 flight_size; 829 830 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 831 832 /* Destination */ 833 struct dst_entry *dst; 834 /* Source address. */ 835 union sctp_addr saddr; 836 837 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 838 * the destination address every heartbeat interval. 839 */ 840 unsigned long hbinterval; 841 842 /* SACK delay timeout */ 843 unsigned long sackdelay; 844 __u32 sackfreq; 845 846 /* When was the last time that we heard from this transport? We use 847 * this to pick new active and retran paths. 848 */ 849 ktime_t last_time_heard; 850 851 /* Last time(in jiffies) when cwnd is reduced due to the congestion 852 * indication based on ECNE chunk. 853 */ 854 unsigned long last_time_ecne_reduced; 855 856 /* This is the max_retrans value for the transport and will 857 * be initialized from the assocs value. This can be changed 858 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 859 */ 860 __u16 pathmaxrxt; 861 862 /* This is the partially failed retrans value for the transport 863 * and will be initialized from the assocs value. This can be changed 864 * using the SCTP_PEER_ADDR_THLDS socket option 865 */ 866 int pf_retrans; 867 /* PMTU : The current known path MTU. */ 868 __u32 pathmtu; 869 870 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 871 __u32 param_flags; 872 873 /* The number of times INIT has been sent on this transport. */ 874 int init_sent_count; 875 876 /* state : The current state of this destination, 877 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 878 */ 879 int state; 880 881 /* These are the error stats for this destination. */ 882 883 /* Error count : The current error count for this destination. */ 884 unsigned short error_count; 885 886 /* Per : A timer used by each destination. 887 * Destination : 888 * Timer : 889 * 890 * [Everywhere else in the text this is called T3-rtx. -ed] 891 */ 892 struct timer_list T3_rtx_timer; 893 894 /* Heartbeat timer is per destination. */ 895 struct timer_list hb_timer; 896 897 /* Timer to handle ICMP proto unreachable envets */ 898 struct timer_list proto_unreach_timer; 899 900 /* Since we're using per-destination retransmission timers 901 * (see above), we're also using per-destination "transmitted" 902 * queues. This probably ought to be a private struct 903 * accessible only within the outqueue, but it's not, yet. 904 */ 905 struct list_head transmitted; 906 907 /* We build bundle-able packets for this transport here. */ 908 struct sctp_packet packet; 909 910 /* This is the list of transports that have chunks to send. */ 911 struct list_head send_ready; 912 913 /* State information saved for SFR_CACC algorithm. The key 914 * idea in SFR_CACC is to maintain state at the sender on a 915 * per-destination basis when a changeover happens. 916 * char changeover_active; 917 * char cycling_changeover; 918 * __u32 next_tsn_at_change; 919 * char cacc_saw_newack; 920 */ 921 struct { 922 /* An unsigned integer, which stores the next TSN to be 923 * used by the sender, at the moment of changeover. 924 */ 925 __u32 next_tsn_at_change; 926 927 /* A flag which indicates the occurrence of a changeover */ 928 char changeover_active; 929 930 /* A flag which indicates whether the change of primary is 931 * the first switch to this destination address during an 932 * active switch. 933 */ 934 char cycling_changeover; 935 936 /* A temporary flag, which is used during the processing of 937 * a SACK to estimate the causative TSN(s)'s group. 938 */ 939 char cacc_saw_newack; 940 } cacc; 941 942 /* 64-bit random number sent with heartbeat. */ 943 __u64 hb_nonce; 944 945 struct rcu_head rcu; 946 }; 947 948 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 949 gfp_t); 950 void sctp_transport_set_owner(struct sctp_transport *, 951 struct sctp_association *); 952 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 953 struct sctp_sock *); 954 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 955 void sctp_transport_free(struct sctp_transport *); 956 void sctp_transport_reset_timers(struct sctp_transport *); 957 int sctp_transport_hold(struct sctp_transport *); 958 void sctp_transport_put(struct sctp_transport *); 959 void sctp_transport_update_rto(struct sctp_transport *, __u32); 960 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 961 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 962 void sctp_transport_burst_limited(struct sctp_transport *); 963 void sctp_transport_burst_reset(struct sctp_transport *); 964 unsigned long sctp_transport_timeout(struct sctp_transport *); 965 void sctp_transport_reset(struct sctp_transport *); 966 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); 967 void sctp_transport_immediate_rtx(struct sctp_transport *); 968 969 970 /* This is the structure we use to queue packets as they come into 971 * SCTP. We write packets to it and read chunks from it. 972 */ 973 struct sctp_inq { 974 /* This is actually a queue of sctp_chunk each 975 * containing a partially decoded packet. 976 */ 977 struct list_head in_chunk_list; 978 /* This is the packet which is currently off the in queue and is 979 * being worked on through the inbound chunk processing. 980 */ 981 struct sctp_chunk *in_progress; 982 983 /* This is the delayed task to finish delivering inbound 984 * messages. 985 */ 986 struct work_struct immediate; 987 }; 988 989 void sctp_inq_init(struct sctp_inq *); 990 void sctp_inq_free(struct sctp_inq *); 991 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 992 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 993 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 994 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 995 996 /* This is the structure we use to hold outbound chunks. You push 997 * chunks in and they automatically pop out the other end as bundled 998 * packets (it calls (*output_handler)()). 999 * 1000 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1001 * and 8.2 of the v13 draft. 1002 * 1003 * It handles retransmissions. The connection to the timeout portion 1004 * of the state machine is through sctp_..._timeout() and timeout_handler. 1005 * 1006 * If you feed it SACKs, it will eat them. 1007 * 1008 * If you give it big chunks, it will fragment them. 1009 * 1010 * It assigns TSN's to data chunks. This happens at the last possible 1011 * instant before transmission. 1012 * 1013 * When free()'d, it empties itself out via output_handler(). 1014 */ 1015 struct sctp_outq { 1016 struct sctp_association *asoc; 1017 1018 /* Data pending that has never been transmitted. */ 1019 struct list_head out_chunk_list; 1020 1021 unsigned int out_qlen; /* Total length of queued data chunks. */ 1022 1023 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1024 unsigned int error; 1025 1026 /* These are control chunks we want to send. */ 1027 struct list_head control_chunk_list; 1028 1029 /* These are chunks that have been sacked but are above the 1030 * CTSN, or cumulative tsn ack point. 1031 */ 1032 struct list_head sacked; 1033 1034 /* Put chunks on this list to schedule them for 1035 * retransmission. 1036 */ 1037 struct list_head retransmit; 1038 1039 /* Put chunks on this list to save them for FWD TSN processing as 1040 * they were abandoned. 1041 */ 1042 struct list_head abandoned; 1043 1044 /* How many unackd bytes do we have in-flight? */ 1045 __u32 outstanding_bytes; 1046 1047 /* Are we doing fast-rtx on this queue */ 1048 char fast_rtx; 1049 1050 /* Corked? */ 1051 char cork; 1052 }; 1053 1054 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1055 void sctp_outq_teardown(struct sctp_outq *); 1056 void sctp_outq_free(struct sctp_outq*); 1057 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1058 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1059 int sctp_outq_is_empty(const struct sctp_outq *); 1060 void sctp_outq_restart(struct sctp_outq *); 1061 1062 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1063 sctp_retransmit_reason_t); 1064 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1065 int sctp_outq_uncork(struct sctp_outq *); 1066 /* Uncork and flush an outqueue. */ 1067 static inline void sctp_outq_cork(struct sctp_outq *q) 1068 { 1069 q->cork = 1; 1070 } 1071 1072 /* These bind address data fields common between endpoints and associations */ 1073 struct sctp_bind_addr { 1074 1075 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1076 * 1077 * SCTP Port: The local SCTP port number the endpoint is 1078 * bound to. 1079 */ 1080 __u16 port; 1081 1082 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1083 * 1084 * Address List: The list of IP addresses that this instance 1085 * has bound. This information is passed to one's 1086 * peer(s) in INIT and INIT ACK chunks. 1087 */ 1088 struct list_head address_list; 1089 }; 1090 1091 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1092 void sctp_bind_addr_free(struct sctp_bind_addr *); 1093 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1094 const struct sctp_bind_addr *src, 1095 sctp_scope_t scope, gfp_t gfp, 1096 int flags); 1097 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1098 const struct sctp_bind_addr *src, 1099 gfp_t gfp); 1100 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1101 __u8 addr_state, gfp_t gfp); 1102 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1103 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1104 struct sctp_sock *); 1105 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1106 struct sctp_sock *, struct sctp_sock *); 1107 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1108 const union sctp_addr *addr); 1109 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1110 const union sctp_addr *addrs, 1111 int addrcnt, 1112 struct sctp_sock *opt); 1113 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1114 int *addrs_len, 1115 gfp_t gfp); 1116 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1117 __u16 port, gfp_t gfp); 1118 1119 sctp_scope_t sctp_scope(const union sctp_addr *); 1120 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1121 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1122 int sctp_is_ep_boundall(struct sock *sk); 1123 1124 1125 /* What type of endpoint? */ 1126 typedef enum { 1127 SCTP_EP_TYPE_SOCKET, 1128 SCTP_EP_TYPE_ASSOCIATION, 1129 } sctp_endpoint_type_t; 1130 1131 /* 1132 * A common base class to bridge the implmentation view of a 1133 * socket (usually listening) endpoint versus an association's 1134 * local endpoint. 1135 * This common structure is useful for several purposes: 1136 * 1) Common interface for lookup routines. 1137 * a) Subfunctions work for either endpoint or association 1138 * b) Single interface to lookup allows hiding the lookup lock rather 1139 * than acquiring it externally. 1140 * 2) Common interface for the inbound chunk handling/state machine. 1141 * 3) Common object handling routines for reference counting, etc. 1142 * 4) Disentangle association lookup from endpoint lookup, where we 1143 * do not have to find our endpoint to find our association. 1144 * 1145 */ 1146 1147 struct sctp_ep_common { 1148 /* Fields to help us manage our entries in the hash tables. */ 1149 struct hlist_node node; 1150 int hashent; 1151 1152 /* Runtime type information. What kind of endpoint is this? */ 1153 sctp_endpoint_type_t type; 1154 1155 /* Some fields to help us manage this object. 1156 * refcnt - Reference count access to this object. 1157 * dead - Do not attempt to use this object. 1158 */ 1159 atomic_t refcnt; 1160 bool dead; 1161 1162 /* What socket does this endpoint belong to? */ 1163 struct sock *sk; 1164 1165 /* This is where we receive inbound chunks. */ 1166 struct sctp_inq inqueue; 1167 1168 /* This substructure includes the defining parameters of the 1169 * endpoint: 1170 * bind_addr.port is our shared port number. 1171 * bind_addr.address_list is our set of local IP addresses. 1172 */ 1173 struct sctp_bind_addr bind_addr; 1174 }; 1175 1176 1177 /* RFC Section 1.4 Key Terms 1178 * 1179 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1180 * multi-homed host, an SCTP endpoint is represented to its peers as a 1181 * combination of a set of eligible destination transport addresses to 1182 * which SCTP packets can be sent and a set of eligible source 1183 * transport addresses from which SCTP packets can be received. 1184 * All transport addresses used by an SCTP endpoint must use the 1185 * same port number, but can use multiple IP addresses. A transport 1186 * address used by an SCTP endpoint must not be used by another 1187 * SCTP endpoint. In other words, a transport address is unique 1188 * to an SCTP endpoint. 1189 * 1190 * From an implementation perspective, each socket has one of these. 1191 * A TCP-style socket will have exactly one association on one of 1192 * these. An UDP-style socket will have multiple associations hanging 1193 * off one of these. 1194 */ 1195 1196 struct sctp_endpoint { 1197 /* Common substructure for endpoint and association. */ 1198 struct sctp_ep_common base; 1199 1200 /* Associations: A list of current associations and mappings 1201 * to the data consumers for each association. This 1202 * may be in the form of a hash table or other 1203 * implementation dependent structure. The data 1204 * consumers may be process identification 1205 * information such as file descriptors, named pipe 1206 * pointer, or table pointers dependent on how SCTP 1207 * is implemented. 1208 */ 1209 /* This is really a list of struct sctp_association entries. */ 1210 struct list_head asocs; 1211 1212 /* Secret Key: A secret key used by this endpoint to compute 1213 * the MAC. This SHOULD be a cryptographic quality 1214 * random number with a sufficient length. 1215 * Discussion in [RFC1750] can be helpful in 1216 * selection of the key. 1217 */ 1218 __u8 secret_key[SCTP_SECRET_SIZE]; 1219 1220 /* digest: This is a digest of the sctp cookie. This field is 1221 * only used on the receive path when we try to validate 1222 * that the cookie has not been tampered with. We put 1223 * this here so we pre-allocate this once and can re-use 1224 * on every receive. 1225 */ 1226 __u8 *digest; 1227 1228 /* sendbuf acct. policy. */ 1229 __u32 sndbuf_policy; 1230 1231 /* rcvbuf acct. policy. */ 1232 __u32 rcvbuf_policy; 1233 1234 /* SCTP AUTH: array of the HMACs that will be allocated 1235 * we need this per association so that we don't serialize 1236 */ 1237 struct crypto_hash **auth_hmacs; 1238 1239 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1240 struct sctp_hmac_algo_param *auth_hmacs_list; 1241 1242 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1243 struct sctp_chunks_param *auth_chunk_list; 1244 1245 /* SCTP-AUTH: endpoint shared keys */ 1246 struct list_head endpoint_shared_keys; 1247 __u16 active_key_id; 1248 __u8 auth_enable; 1249 }; 1250 1251 /* Recover the outter endpoint structure. */ 1252 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1253 { 1254 struct sctp_endpoint *ep; 1255 1256 ep = container_of(base, struct sctp_endpoint, base); 1257 return ep; 1258 } 1259 1260 /* These are function signatures for manipulating endpoints. */ 1261 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1262 void sctp_endpoint_free(struct sctp_endpoint *); 1263 void sctp_endpoint_put(struct sctp_endpoint *); 1264 void sctp_endpoint_hold(struct sctp_endpoint *); 1265 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1266 struct sctp_association *sctp_endpoint_lookup_assoc( 1267 const struct sctp_endpoint *ep, 1268 const union sctp_addr *paddr, 1269 struct sctp_transport **); 1270 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1271 const union sctp_addr *); 1272 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1273 struct net *, const union sctp_addr *); 1274 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1275 const union sctp_addr *paddr); 1276 1277 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1278 const struct sctp_association *asoc, 1279 sctp_cid_t, sctp_init_chunk_t *peer_init, 1280 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1281 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1282 const union sctp_addr *peer, 1283 sctp_init_chunk_t *init, gfp_t gfp); 1284 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1285 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1286 1287 struct sctp_inithdr_host { 1288 __u32 init_tag; 1289 __u32 a_rwnd; 1290 __u16 num_outbound_streams; 1291 __u16 num_inbound_streams; 1292 __u32 initial_tsn; 1293 }; 1294 1295 /* SCTP_GET_ASSOC_STATS counters */ 1296 struct sctp_priv_assoc_stats { 1297 /* Maximum observed rto in the association during subsequent 1298 * observations. Value is set to 0 if no RTO measurement took place 1299 * The transport where the max_rto was observed is returned in 1300 * obs_rto_ipaddr 1301 */ 1302 struct sockaddr_storage obs_rto_ipaddr; 1303 __u64 max_obs_rto; 1304 /* Total In and Out SACKs received and sent */ 1305 __u64 isacks; 1306 __u64 osacks; 1307 /* Total In and Out packets received and sent */ 1308 __u64 opackets; 1309 __u64 ipackets; 1310 /* Total retransmitted chunks */ 1311 __u64 rtxchunks; 1312 /* TSN received > next expected */ 1313 __u64 outofseqtsns; 1314 /* Duplicate Chunks received */ 1315 __u64 idupchunks; 1316 /* Gap Ack Blocks received */ 1317 __u64 gapcnt; 1318 /* Unordered data chunks sent and received */ 1319 __u64 ouodchunks; 1320 __u64 iuodchunks; 1321 /* Ordered data chunks sent and received */ 1322 __u64 oodchunks; 1323 __u64 iodchunks; 1324 /* Control chunks sent and received */ 1325 __u64 octrlchunks; 1326 __u64 ictrlchunks; 1327 }; 1328 1329 /* RFC2960 1330 * 1331 * 12. Recommended Transmission Control Block (TCB) Parameters 1332 * 1333 * This section details a recommended set of parameters that should 1334 * be contained within the TCB for an implementation. This section is 1335 * for illustrative purposes and should not be deemed as requirements 1336 * on an implementation or as an exhaustive list of all parameters 1337 * inside an SCTP TCB. Each implementation may need its own additional 1338 * parameters for optimization. 1339 */ 1340 1341 1342 /* Here we have information about each individual association. */ 1343 struct sctp_association { 1344 1345 /* A base structure common to endpoint and association. 1346 * In this context, it represents the associations's view 1347 * of the local endpoint of the association. 1348 */ 1349 struct sctp_ep_common base; 1350 1351 /* Associations on the same socket. */ 1352 struct list_head asocs; 1353 1354 /* association id. */ 1355 sctp_assoc_t assoc_id; 1356 1357 /* This is our parent endpoint. */ 1358 struct sctp_endpoint *ep; 1359 1360 /* These are those association elements needed in the cookie. */ 1361 struct sctp_cookie c; 1362 1363 /* This is all information about our peer. */ 1364 struct { 1365 /* transport_addr_list 1366 * 1367 * Peer : A list of SCTP transport addresses that the 1368 * Transport : peer is bound to. This information is derived 1369 * Address : from the INIT or INIT ACK and is used to 1370 * List : associate an inbound packet with a given 1371 * : association. Normally this information is 1372 * : hashed or keyed for quick lookup and access 1373 * : of the TCB. 1374 * : The list is also initialized with the list 1375 * : of addresses passed with the sctp_connectx() 1376 * : call. 1377 * 1378 * It is a list of SCTP_transport's. 1379 */ 1380 struct list_head transport_addr_list; 1381 1382 /* rwnd 1383 * 1384 * Peer Rwnd : Current calculated value of the peer's rwnd. 1385 */ 1386 __u32 rwnd; 1387 1388 /* transport_count 1389 * 1390 * Peer : A count of the number of peer addresses 1391 * Transport : in the Peer Transport Address List. 1392 * Address : 1393 * Count : 1394 */ 1395 __u16 transport_count; 1396 1397 /* port 1398 * The transport layer port number. 1399 */ 1400 __u16 port; 1401 1402 /* primary_path 1403 * 1404 * Primary : This is the current primary destination 1405 * Path : transport address of the peer endpoint. It 1406 * : may also specify a source transport address 1407 * : on this endpoint. 1408 * 1409 * All of these paths live on transport_addr_list. 1410 * 1411 * At the bakeoffs, we discovered that the intent of 1412 * primaryPath is that it only changes when the ULP 1413 * asks to have it changed. We add the activePath to 1414 * designate the connection we are currently using to 1415 * transmit new data and most control chunks. 1416 */ 1417 struct sctp_transport *primary_path; 1418 1419 /* Cache the primary path address here, when we 1420 * need a an address for msg_name. 1421 */ 1422 union sctp_addr primary_addr; 1423 1424 /* active_path 1425 * The path that we are currently using to 1426 * transmit new data and most control chunks. 1427 */ 1428 struct sctp_transport *active_path; 1429 1430 /* retran_path 1431 * 1432 * RFC2960 6.4 Multi-homed SCTP Endpoints 1433 * ... 1434 * Furthermore, when its peer is multi-homed, an 1435 * endpoint SHOULD try to retransmit a chunk to an 1436 * active destination transport address that is 1437 * different from the last destination address to 1438 * which the DATA chunk was sent. 1439 */ 1440 struct sctp_transport *retran_path; 1441 1442 /* Pointer to last transport I have sent on. */ 1443 struct sctp_transport *last_sent_to; 1444 1445 /* This is the last transport I have received DATA on. */ 1446 struct sctp_transport *last_data_from; 1447 1448 /* 1449 * Mapping An array of bits or bytes indicating which out of 1450 * Array order TSN's have been received (relative to the 1451 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1452 * order packets have been received, this array 1453 * will be set to all zero. This structure may be 1454 * in the form of a circular buffer or bit array. 1455 * 1456 * Last Rcvd : This is the last TSN received in 1457 * TSN : sequence. This value is set initially by 1458 * : taking the peer's Initial TSN, received in 1459 * : the INIT or INIT ACK chunk, and subtracting 1460 * : one from it. 1461 * 1462 * Throughout most of the specification this is called the 1463 * "Cumulative TSN ACK Point". In this case, we 1464 * ignore the advice in 12.2 in favour of the term 1465 * used in the bulk of the text. This value is hidden 1466 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1467 */ 1468 struct sctp_tsnmap tsn_map; 1469 1470 /* This mask is used to disable sending the ASCONF chunk 1471 * with specified parameter to peer. 1472 */ 1473 __be16 addip_disabled_mask; 1474 1475 /* These are capabilities which our peer advertised. */ 1476 __u8 ecn_capable:1, /* Can peer do ECN? */ 1477 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1478 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1479 hostname_address:1, /* Peer understands DNS addresses? */ 1480 asconf_capable:1, /* Does peer support ADDIP? */ 1481 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1482 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1483 1484 /* sack_needed : This flag indicates if the next received 1485 * : packet is to be responded to with a 1486 * : SACK. This is initialized to 0. When a packet 1487 * : is received sack_cnt is incremented. If this value 1488 * : reaches 2 or more, a SACK is sent and the 1489 * : value is reset to 0. Note: This is used only 1490 * : when no DATA chunks are received out of 1491 * : order. When DATA chunks are out of order, 1492 * : SACK's are not delayed (see Section 6). 1493 */ 1494 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1495 sack_generation:1, 1496 zero_window_announced:1; 1497 __u32 sack_cnt; 1498 1499 __u32 adaptation_ind; /* Adaptation Code point. */ 1500 1501 struct sctp_inithdr_host i; 1502 void *cookie; 1503 int cookie_len; 1504 1505 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1506 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1507 * Initial TSN Value minus 1 1508 */ 1509 __u32 addip_serial; 1510 1511 /* SCTP-AUTH: We need to know pears random number, hmac list 1512 * and authenticated chunk list. All that is part of the 1513 * cookie and these are just pointers to those locations 1514 */ 1515 sctp_random_param_t *peer_random; 1516 sctp_chunks_param_t *peer_chunks; 1517 sctp_hmac_algo_param_t *peer_hmacs; 1518 } peer; 1519 1520 /* State : A state variable indicating what state the 1521 * : association is in, i.e. COOKIE-WAIT, 1522 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1523 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1524 * 1525 * Note: No "CLOSED" state is illustrated since if a 1526 * association is "CLOSED" its TCB SHOULD be removed. 1527 * 1528 * In this implementation we DO have a CLOSED 1529 * state which is used during initiation and shutdown. 1530 * 1531 * State takes values from SCTP_STATE_*. 1532 */ 1533 sctp_state_t state; 1534 1535 /* Overall : The overall association error count. 1536 * Error Count : [Clear this any time I get something.] 1537 */ 1538 int overall_error_count; 1539 1540 /* The cookie life I award for any cookie. */ 1541 ktime_t cookie_life; 1542 1543 /* These are the association's initial, max, and min RTO values. 1544 * These values will be initialized by system defaults, but can 1545 * be modified via the SCTP_RTOINFO socket option. 1546 */ 1547 unsigned long rto_initial; 1548 unsigned long rto_max; 1549 unsigned long rto_min; 1550 1551 /* Maximum number of new data packets that can be sent in a burst. */ 1552 int max_burst; 1553 1554 /* This is the max_retrans value for the association. This value will 1555 * be initialized initialized from system defaults, but can be 1556 * modified by the SCTP_ASSOCINFO socket option. 1557 */ 1558 int max_retrans; 1559 1560 /* This is the partially failed retrans value for the transport 1561 * and will be initialized from the assocs value. This can be 1562 * changed using the SCTP_PEER_ADDR_THLDS socket option 1563 */ 1564 int pf_retrans; 1565 1566 /* Maximum number of times the endpoint will retransmit INIT */ 1567 __u16 max_init_attempts; 1568 1569 /* How many times have we resent an INIT? */ 1570 __u16 init_retries; 1571 1572 /* The largest timeout or RTO value to use in attempting an INIT */ 1573 unsigned long max_init_timeo; 1574 1575 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1576 * the destination address every heartbeat interval. This value 1577 * will be inherited by all new transports. 1578 */ 1579 unsigned long hbinterval; 1580 1581 /* This is the max_retrans value for new transports in the 1582 * association. 1583 */ 1584 __u16 pathmaxrxt; 1585 1586 /* Flag that path mtu update is pending */ 1587 __u8 pmtu_pending; 1588 1589 /* Association : The smallest PMTU discovered for all of the 1590 * PMTU : peer's transport addresses. 1591 */ 1592 __u32 pathmtu; 1593 1594 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1595 __u32 param_flags; 1596 1597 __u32 sackfreq; 1598 /* SACK delay timeout */ 1599 unsigned long sackdelay; 1600 1601 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1602 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1603 1604 /* Transport to which SHUTDOWN chunk was last sent. */ 1605 struct sctp_transport *shutdown_last_sent_to; 1606 1607 /* Transport to which INIT chunk was last sent. */ 1608 struct sctp_transport *init_last_sent_to; 1609 1610 /* How many times have we resent a SHUTDOWN */ 1611 int shutdown_retries; 1612 1613 /* Next TSN : The next TSN number to be assigned to a new 1614 * : DATA chunk. This is sent in the INIT or INIT 1615 * : ACK chunk to the peer and incremented each 1616 * : time a DATA chunk is assigned a TSN 1617 * : (normally just prior to transmit or during 1618 * : fragmentation). 1619 */ 1620 __u32 next_tsn; 1621 1622 /* 1623 * Last Rcvd : This is the last TSN received in sequence. This value 1624 * TSN : is set initially by taking the peer's Initial TSN, 1625 * : received in the INIT or INIT ACK chunk, and 1626 * : subtracting one from it. 1627 * 1628 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1629 */ 1630 1631 __u32 ctsn_ack_point; 1632 1633 /* PR-SCTP Advanced.Peer.Ack.Point */ 1634 __u32 adv_peer_ack_point; 1635 1636 /* Highest TSN that is acknowledged by incoming SACKs. */ 1637 __u32 highest_sacked; 1638 1639 /* TSN marking the fast recovery exit point */ 1640 __u32 fast_recovery_exit; 1641 1642 /* Flag to track the current fast recovery state */ 1643 __u8 fast_recovery; 1644 1645 /* The number of unacknowledged data chunks. Reported through 1646 * the SCTP_STATUS sockopt. 1647 */ 1648 __u16 unack_data; 1649 1650 /* The total number of data chunks that we've had to retransmit 1651 * as the result of a T3 timer expiration 1652 */ 1653 __u32 rtx_data_chunks; 1654 1655 /* This is the association's receive buffer space. This value is used 1656 * to set a_rwnd field in an INIT or a SACK chunk. 1657 */ 1658 __u32 rwnd; 1659 1660 /* This is the last advertised value of rwnd over a SACK chunk. */ 1661 __u32 a_rwnd; 1662 1663 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1664 * to slop over a maximum of the association's frag_point. 1665 */ 1666 __u32 rwnd_over; 1667 1668 /* Keeps treack of rwnd pressure. This happens when we have 1669 * a window, but not recevie buffer (i.e small packets). This one 1670 * is releases slowly (1 PMTU at a time ). 1671 */ 1672 __u32 rwnd_press; 1673 1674 /* This is the sndbuf size in use for the association. 1675 * This corresponds to the sndbuf size for the association, 1676 * as specified in the sk->sndbuf. 1677 */ 1678 int sndbuf_used; 1679 1680 /* This is the amount of memory that this association has allocated 1681 * in the receive path at any given time. 1682 */ 1683 atomic_t rmem_alloc; 1684 1685 /* This is the wait queue head for send requests waiting on 1686 * the association sndbuf space. 1687 */ 1688 wait_queue_head_t wait; 1689 1690 /* The message size at which SCTP fragmentation will occur. */ 1691 __u32 frag_point; 1692 __u32 user_frag; 1693 1694 /* Counter used to count INIT errors. */ 1695 int init_err_counter; 1696 1697 /* Count the number of INIT cycles (for doubling timeout). */ 1698 int init_cycle; 1699 1700 /* Default send parameters. */ 1701 __u16 default_stream; 1702 __u16 default_flags; 1703 __u32 default_ppid; 1704 __u32 default_context; 1705 __u32 default_timetolive; 1706 1707 /* Default receive parameters */ 1708 __u32 default_rcv_context; 1709 1710 /* This tracks outbound ssn for a given stream. */ 1711 struct sctp_ssnmap *ssnmap; 1712 1713 /* All outbound chunks go through this structure. */ 1714 struct sctp_outq outqueue; 1715 1716 /* A smart pipe that will handle reordering and fragmentation, 1717 * as well as handle passing events up to the ULP. 1718 */ 1719 struct sctp_ulpq ulpq; 1720 1721 /* Last TSN that caused an ECNE Chunk to be sent. */ 1722 __u32 last_ecne_tsn; 1723 1724 /* Last TSN that caused a CWR Chunk to be sent. */ 1725 __u32 last_cwr_tsn; 1726 1727 /* How many duplicated TSNs have we seen? */ 1728 int numduptsns; 1729 1730 /* These are to support 1731 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1732 * and Enforcement of Flow and Message Limits" 1733 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1734 * or "ADDIP" for short. 1735 */ 1736 1737 1738 1739 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1740 * 1741 * R1) One and only one ASCONF Chunk MAY be in transit and 1742 * unacknowledged at any one time. If a sender, after sending 1743 * an ASCONF chunk, decides it needs to transfer another 1744 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1745 * returns from the previous ASCONF Chunk before sending a 1746 * subsequent ASCONF. Note this restriction binds each side, 1747 * so at any time two ASCONF may be in-transit on any given 1748 * association (one sent from each endpoint). 1749 * 1750 * [This is our one-and-only-one ASCONF in flight. If we do 1751 * not have an ASCONF in flight, this is NULL.] 1752 */ 1753 struct sctp_chunk *addip_last_asconf; 1754 1755 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1756 * 1757 * This is needed to implement itmes E1 - E4 of the updated 1758 * spec. Here is the justification: 1759 * 1760 * Since the peer may bundle multiple ASCONF chunks toward us, 1761 * we now need the ability to cache multiple ACKs. The section 1762 * describes in detail how they are cached and cleaned up. 1763 */ 1764 struct list_head asconf_ack_list; 1765 1766 /* These ASCONF chunks are waiting to be sent. 1767 * 1768 * These chunaks can't be pushed to outqueue until receiving 1769 * ASCONF_ACK for the previous ASCONF indicated by 1770 * addip_last_asconf, so as to guarantee that only one ASCONF 1771 * is in flight at any time. 1772 * 1773 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1774 * 1775 * In defining the ASCONF Chunk transfer procedures, it is 1776 * essential that these transfers MUST NOT cause congestion 1777 * within the network. To achieve this, we place these 1778 * restrictions on the transfer of ASCONF Chunks: 1779 * 1780 * R1) One and only one ASCONF Chunk MAY be in transit and 1781 * unacknowledged at any one time. If a sender, after sending 1782 * an ASCONF chunk, decides it needs to transfer another 1783 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1784 * returns from the previous ASCONF Chunk before sending a 1785 * subsequent ASCONF. Note this restriction binds each side, 1786 * so at any time two ASCONF may be in-transit on any given 1787 * association (one sent from each endpoint). 1788 * 1789 * 1790 * [I really think this is EXACTLY the sort of intelligence 1791 * which already resides in sctp_outq. Please move this 1792 * queue and its supporting logic down there. --piggy] 1793 */ 1794 struct list_head addip_chunk_list; 1795 1796 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1797 * 1798 * A2) A serial number should be assigned to the Chunk. The 1799 * serial number SHOULD be a monotonically increasing 1800 * number. The serial number SHOULD be initialized at 1801 * the start of the association to the same value as the 1802 * Initial TSN and every time a new ASCONF chunk is created 1803 * it is incremented by one after assigning the serial number 1804 * to the newly created chunk. 1805 * 1806 * ADDIP 1807 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1808 * 1809 * Serial Number : 32 bits (unsigned integer) 1810 * 1811 * This value represents a Serial Number for the ASCONF 1812 * Chunk. The valid range of Serial Number is from 0 to 1813 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1814 * after reaching 4294967295. 1815 */ 1816 __u32 addip_serial; 1817 int src_out_of_asoc_ok; 1818 union sctp_addr *asconf_addr_del_pending; 1819 struct sctp_transport *new_transport; 1820 1821 /* SCTP AUTH: list of the endpoint shared keys. These 1822 * keys are provided out of band by the user applicaton 1823 * and can't change during the lifetime of the association 1824 */ 1825 struct list_head endpoint_shared_keys; 1826 1827 /* SCTP AUTH: 1828 * The current generated assocaition shared key (secret) 1829 */ 1830 struct sctp_auth_bytes *asoc_shared_key; 1831 1832 /* SCTP AUTH: hmac id of the first peer requested algorithm 1833 * that we support. 1834 */ 1835 __u16 default_hmac_id; 1836 1837 __u16 active_key_id; 1838 1839 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1840 temp:1; /* Is it a temporary association? */ 1841 1842 struct sctp_priv_assoc_stats stats; 1843 }; 1844 1845 1846 /* An eyecatcher for determining if we are really looking at an 1847 * association data structure. 1848 */ 1849 enum { 1850 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1851 }; 1852 1853 /* Recover the outter association structure. */ 1854 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1855 { 1856 struct sctp_association *asoc; 1857 1858 asoc = container_of(base, struct sctp_association, base); 1859 return asoc; 1860 } 1861 1862 /* These are function signatures for manipulating associations. */ 1863 1864 1865 struct sctp_association * 1866 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1867 sctp_scope_t scope, gfp_t gfp); 1868 void sctp_association_free(struct sctp_association *); 1869 void sctp_association_put(struct sctp_association *); 1870 void sctp_association_hold(struct sctp_association *); 1871 1872 struct sctp_transport *sctp_assoc_choose_alter_transport( 1873 struct sctp_association *, struct sctp_transport *); 1874 void sctp_assoc_update_retran_path(struct sctp_association *); 1875 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1876 const union sctp_addr *); 1877 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1878 const union sctp_addr *laddr); 1879 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1880 const union sctp_addr *address, 1881 const gfp_t gfp, 1882 const int peer_state); 1883 void sctp_assoc_del_peer(struct sctp_association *asoc, 1884 const union sctp_addr *addr); 1885 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1886 struct sctp_transport *peer); 1887 void sctp_assoc_control_transport(struct sctp_association *, 1888 struct sctp_transport *, 1889 sctp_transport_cmd_t, sctp_sn_error_t); 1890 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1891 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1892 struct net *, 1893 const union sctp_addr *, 1894 const union sctp_addr *); 1895 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1896 void sctp_assoc_update(struct sctp_association *old, 1897 struct sctp_association *new); 1898 1899 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1900 1901 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *); 1902 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1903 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1904 void sctp_assoc_set_primary(struct sctp_association *, 1905 struct sctp_transport *); 1906 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1907 struct sctp_transport *); 1908 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1909 sctp_scope_t, gfp_t); 1910 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1911 struct sctp_cookie*, 1912 gfp_t gfp); 1913 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1914 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1915 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1916 const struct sctp_association *asoc, 1917 __be32 serial); 1918 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1919 1920 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1921 const union sctp_addr *ss2); 1922 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1923 1924 /* A convenience structure to parse out SCTP specific CMSGs. */ 1925 typedef struct sctp_cmsgs { 1926 struct sctp_initmsg *init; 1927 struct sctp_sndrcvinfo *srinfo; 1928 struct sctp_sndinfo *sinfo; 1929 } sctp_cmsgs_t; 1930 1931 /* Structure for tracking memory objects */ 1932 typedef struct { 1933 char *label; 1934 atomic_t *counter; 1935 } sctp_dbg_objcnt_entry_t; 1936 1937 #endif /* __sctp_structs_h__ */ 1938