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/socket.h> /* linux/in.h needs this!! */ 52 #include <linux/in.h> /* We get struct sockaddr_in. */ 53 #include <linux/in6.h> /* We get struct in6_addr */ 54 #include <linux/ipv6.h> 55 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 56 #include <linux/atomic.h> /* This gets us atomic counters. */ 57 #include <linux/skbuff.h> /* We need sk_buff_head. */ 58 #include <linux/workqueue.h> /* We need tq_struct. */ 59 #include <linux/sctp.h> /* We need sctp* header structs. */ 60 #include <net/sctp/auth.h> /* We need auth specific structs */ 61 62 /* A convenience structure for handling sockaddr structures. 63 * We should wean ourselves off this. 64 */ 65 union sctp_addr { 66 struct sockaddr_in v4; 67 struct sockaddr_in6 v6; 68 struct sockaddr sa; 69 }; 70 71 /* Forward declarations for data structures. */ 72 struct sctp_globals; 73 struct sctp_endpoint; 74 struct sctp_association; 75 struct sctp_transport; 76 struct sctp_packet; 77 struct sctp_chunk; 78 struct sctp_inq; 79 struct sctp_outq; 80 struct sctp_bind_addr; 81 struct sctp_ulpq; 82 struct sctp_ep_common; 83 struct sctp_ssnmap; 84 struct crypto_hash; 85 86 87 #include <net/sctp/tsnmap.h> 88 #include <net/sctp/ulpevent.h> 89 #include <net/sctp/ulpqueue.h> 90 91 /* Structures useful for managing bind/connect. */ 92 93 struct sctp_bind_bucket { 94 unsigned short port; 95 unsigned short fastreuse; 96 struct hlist_node node; 97 struct hlist_head owner; 98 struct net *net; 99 }; 100 101 struct sctp_bind_hashbucket { 102 spinlock_t lock; 103 struct hlist_head chain; 104 }; 105 106 /* Used for hashing all associations. */ 107 struct sctp_hashbucket { 108 rwlock_t lock; 109 struct hlist_head chain; 110 } __attribute__((__aligned__(8))); 111 112 113 /* The SCTP globals structure. */ 114 extern struct sctp_globals { 115 /* This is a list of groups of functions for each address 116 * family that we support. 117 */ 118 struct list_head address_families; 119 120 /* This is the hash of all endpoints. */ 121 struct sctp_hashbucket *ep_hashtable; 122 /* This is the hash of all associations. */ 123 struct sctp_hashbucket *assoc_hashtable; 124 /* This is the sctp port control hash. */ 125 struct sctp_bind_hashbucket *port_hashtable; 126 127 /* Sizes of above hashtables. */ 128 int ep_hashsize; 129 int assoc_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_assoc_hashsize (sctp_globals.assoc_hashsize) 147 #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) 148 #define sctp_port_hashsize (sctp_globals.port_hashsize) 149 #define sctp_port_hashtable (sctp_globals.port_hashtable) 150 #define sctp_checksum_disable (sctp_globals.checksum_disable) 151 152 /* SCTP Socket type: UDP or TCP style. */ 153 typedef enum { 154 SCTP_SOCKET_UDP = 0, 155 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 156 SCTP_SOCKET_TCP 157 } sctp_socket_type_t; 158 159 /* Per socket SCTP information. */ 160 struct sctp_sock { 161 /* inet_sock has to be the first member of sctp_sock */ 162 struct inet_sock inet; 163 /* What kind of a socket is this? */ 164 sctp_socket_type_t type; 165 166 /* PF_ family specific functions. */ 167 struct sctp_pf *pf; 168 169 /* Access to HMAC transform. */ 170 struct crypto_hash *hmac; 171 char *sctp_hmac_alg; 172 173 /* What is our base endpointer? */ 174 struct sctp_endpoint *ep; 175 176 struct sctp_bind_bucket *bind_hash; 177 /* Various Socket Options. */ 178 __u16 default_stream; 179 __u32 default_ppid; 180 __u16 default_flags; 181 __u32 default_context; 182 __u32 default_timetolive; 183 __u32 default_rcv_context; 184 int max_burst; 185 186 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 187 * the destination address every heartbeat interval. This value 188 * will be inherited by all new associations. 189 */ 190 __u32 hbinterval; 191 192 /* This is the max_retrans value for new associations. */ 193 __u16 pathmaxrxt; 194 195 /* The initial Path MTU to use for new associations. */ 196 __u32 pathmtu; 197 198 /* The default SACK delay timeout for new associations. */ 199 __u32 sackdelay; 200 __u32 sackfreq; 201 202 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 203 __u32 param_flags; 204 205 struct sctp_initmsg initmsg; 206 struct sctp_rtoinfo rtoinfo; 207 struct sctp_paddrparams paddrparam; 208 struct sctp_event_subscribe subscribe; 209 struct sctp_assocparams assocparams; 210 211 int user_frag; 212 213 __u32 autoclose; 214 __u8 nodelay; 215 __u8 disable_fragments; 216 __u8 v4mapped; 217 __u8 frag_interleave; 218 __u32 adaptation_ind; 219 __u32 pd_point; 220 __u8 recvrcvinfo; 221 __u8 recvnxtinfo; 222 223 atomic_t pd_mode; 224 /* Receive to here while partial delivery is in effect. */ 225 struct sk_buff_head pd_lobby; 226 struct list_head auto_asconf_list; 227 int do_auto_asconf; 228 }; 229 230 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 231 { 232 return (struct sctp_sock *)sk; 233 } 234 235 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 236 { 237 return (struct sock *)sp; 238 } 239 240 #if IS_ENABLED(CONFIG_IPV6) 241 struct sctp6_sock { 242 struct sctp_sock sctp; 243 struct ipv6_pinfo inet6; 244 }; 245 #endif /* CONFIG_IPV6 */ 246 247 248 /* This is our APPLICATION-SPECIFIC state cookie. 249 * THIS IS NOT DICTATED BY THE SPECIFICATION. 250 */ 251 /* These are the parts of an association which we send in the cookie. 252 * Most of these are straight out of: 253 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 254 * 255 */ 256 257 struct sctp_cookie { 258 259 /* My : Tag expected in every inbound packet and sent 260 * Verification: in the INIT or INIT ACK chunk. 261 * Tag : 262 */ 263 __u32 my_vtag; 264 265 /* Peer's : Tag expected in every outbound packet except 266 * Verification: in the INIT chunk. 267 * Tag : 268 */ 269 __u32 peer_vtag; 270 271 /* The rest of these are not from the spec, but really need to 272 * be in the cookie. 273 */ 274 275 /* My Tie Tag : Assist in discovering a restarting association. */ 276 __u32 my_ttag; 277 278 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 279 __u32 peer_ttag; 280 281 /* When does this cookie expire? */ 282 ktime_t expiration; 283 284 /* Number of inbound/outbound streams which are set 285 * and negotiated during the INIT process. 286 */ 287 __u16 sinit_num_ostreams; 288 __u16 sinit_max_instreams; 289 290 /* This is the first sequence number I used. */ 291 __u32 initial_tsn; 292 293 /* This holds the originating address of the INIT packet. */ 294 union sctp_addr peer_addr; 295 296 /* IG Section 2.35.3 297 * Include the source port of the INIT-ACK 298 */ 299 __u16 my_port; 300 301 __u8 prsctp_capable; 302 303 /* Padding for future use */ 304 __u8 padding; 305 306 __u32 adaptation_ind; 307 308 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 309 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 310 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 311 312 /* This is a shim for my peer's INIT packet, followed by 313 * a copy of the raw address list of the association. 314 * The length of the raw address list is saved in the 315 * raw_addr_list_len field, which will be used at the time when 316 * the association TCB is re-constructed from the cookie. 317 */ 318 __u32 raw_addr_list_len; 319 struct sctp_init_chunk peer_init[0]; 320 }; 321 322 323 /* The format of our cookie that we send to our peer. */ 324 struct sctp_signed_cookie { 325 __u8 signature[SCTP_SECRET_SIZE]; 326 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 327 struct sctp_cookie c; 328 } __packed; 329 330 /* This is another convenience type to allocate memory for address 331 * params for the maximum size and pass such structures around 332 * internally. 333 */ 334 union sctp_addr_param { 335 struct sctp_paramhdr p; 336 struct sctp_ipv4addr_param v4; 337 struct sctp_ipv6addr_param v6; 338 }; 339 340 /* A convenience type to allow walking through the various 341 * parameters and avoid casting all over the place. 342 */ 343 union sctp_params { 344 void *v; 345 struct sctp_paramhdr *p; 346 struct sctp_cookie_preserve_param *life; 347 struct sctp_hostname_param *dns; 348 struct sctp_cookie_param *cookie; 349 struct sctp_supported_addrs_param *sat; 350 struct sctp_ipv4addr_param *v4; 351 struct sctp_ipv6addr_param *v6; 352 union sctp_addr_param *addr; 353 struct sctp_adaptation_ind_param *aind; 354 struct sctp_supported_ext_param *ext; 355 struct sctp_random_param *random; 356 struct sctp_chunks_param *chunks; 357 struct sctp_hmac_algo_param *hmac_algo; 358 struct sctp_addip_param *addip; 359 }; 360 361 /* RFC 2960. Section 3.3.5 Heartbeat. 362 * Heartbeat Information: variable length 363 * The Sender-specific Heartbeat Info field should normally include 364 * information about the sender's current time when this HEARTBEAT 365 * chunk is sent and the destination transport address to which this 366 * HEARTBEAT is sent (see Section 8.3). 367 */ 368 typedef struct sctp_sender_hb_info { 369 struct sctp_paramhdr param_hdr; 370 union sctp_addr daddr; 371 unsigned long sent_at; 372 __u64 hb_nonce; 373 } __packed sctp_sender_hb_info_t; 374 375 /* 376 * RFC 2960 1.3.2 Sequenced Delivery within Streams 377 * 378 * The term "stream" is used in SCTP to refer to a sequence of user 379 * messages that are to be delivered to the upper-layer protocol in 380 * order with respect to other messages within the same stream. This is 381 * in contrast to its usage in TCP, where it refers to a sequence of 382 * bytes (in this document a byte is assumed to be eight bits). 383 * ... 384 * 385 * This is the structure we use to track both our outbound and inbound 386 * SSN, or Stream Sequence Numbers. 387 */ 388 389 struct sctp_stream { 390 __u16 *ssn; 391 unsigned int len; 392 }; 393 394 struct sctp_ssnmap { 395 struct sctp_stream in; 396 struct sctp_stream out; 397 }; 398 399 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 400 gfp_t gfp); 401 void sctp_ssnmap_free(struct sctp_ssnmap *map); 402 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 403 404 /* What is the current SSN number for this stream? */ 405 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 406 { 407 return stream->ssn[id]; 408 } 409 410 /* Return the next SSN number for this stream. */ 411 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 412 { 413 return stream->ssn[id]++; 414 } 415 416 /* Skip over this ssn and all below. */ 417 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 418 __u16 ssn) 419 { 420 stream->ssn[id] = ssn+1; 421 } 422 423 /* 424 * Pointers to address related SCTP functions. 425 * (i.e. things that depend on the address family.) 426 */ 427 struct sctp_af { 428 int (*sctp_xmit) (struct sk_buff *skb, 429 struct sctp_transport *); 430 int (*setsockopt) (struct sock *sk, 431 int level, 432 int optname, 433 char __user *optval, 434 unsigned int optlen); 435 int (*getsockopt) (struct sock *sk, 436 int level, 437 int optname, 438 char __user *optval, 439 int __user *optlen); 440 int (*compat_setsockopt) (struct sock *sk, 441 int level, 442 int optname, 443 char __user *optval, 444 unsigned int optlen); 445 int (*compat_getsockopt) (struct sock *sk, 446 int level, 447 int optname, 448 char __user *optval, 449 int __user *optlen); 450 void (*get_dst) (struct sctp_transport *t, 451 union sctp_addr *saddr, 452 struct flowi *fl, 453 struct sock *sk); 454 void (*get_saddr) (struct sctp_sock *sk, 455 struct sctp_transport *t, 456 struct flowi *fl); 457 void (*copy_addrlist) (struct list_head *, 458 struct net_device *); 459 int (*cmp_addr) (const union sctp_addr *addr1, 460 const union sctp_addr *addr2); 461 void (*addr_copy) (union sctp_addr *dst, 462 union sctp_addr *src); 463 void (*from_skb) (union sctp_addr *, 464 struct sk_buff *skb, 465 int saddr); 466 void (*from_sk) (union sctp_addr *, 467 struct sock *sk); 468 void (*from_addr_param) (union sctp_addr *, 469 union sctp_addr_param *, 470 __be16 port, int iif); 471 int (*to_addr_param) (const union sctp_addr *, 472 union sctp_addr_param *); 473 int (*addr_valid) (union sctp_addr *, 474 struct sctp_sock *, 475 const struct sk_buff *); 476 sctp_scope_t (*scope) (union sctp_addr *); 477 void (*inaddr_any) (union sctp_addr *, __be16); 478 int (*is_any) (const union sctp_addr *); 479 int (*available) (union sctp_addr *, 480 struct sctp_sock *); 481 int (*skb_iif) (const struct sk_buff *sk); 482 int (*is_ce) (const struct sk_buff *sk); 483 void (*seq_dump_addr)(struct seq_file *seq, 484 union sctp_addr *addr); 485 void (*ecn_capable)(struct sock *sk); 486 __u16 net_header_len; 487 int sockaddr_len; 488 sa_family_t sa_family; 489 struct list_head list; 490 }; 491 492 struct sctp_af *sctp_get_af_specific(sa_family_t); 493 int sctp_register_af(struct sctp_af *); 494 495 /* Protocol family functions. */ 496 struct sctp_pf { 497 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 498 void (*skb_msgname) (struct sk_buff *, char *, int *); 499 int (*af_supported) (sa_family_t, struct sctp_sock *); 500 int (*cmp_addr) (const union sctp_addr *, 501 const union sctp_addr *, 502 struct sctp_sock *); 503 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 504 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 505 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 506 struct sock *(*create_accept_sk) (struct sock *sk, 507 struct sctp_association *asoc); 508 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 509 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 510 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 511 struct sctp_af *af; 512 }; 513 514 515 /* Structure to track chunk fragments that have been acked, but peer 516 * fragments of the same message have not. 517 */ 518 struct sctp_datamsg { 519 /* Chunks waiting to be submitted to lower layer. */ 520 struct list_head chunks; 521 /* Reference counting. */ 522 atomic_t refcnt; 523 /* When is this message no longer interesting to the peer? */ 524 unsigned long expires_at; 525 /* Did the messenge fail to send? */ 526 int send_error; 527 u8 send_failed:1, 528 can_abandon:1, /* can chunks from this message can be abandoned. */ 529 can_delay; /* should this message be Nagle delayed */ 530 }; 531 532 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 533 struct sctp_sndrcvinfo *, 534 struct iov_iter *); 535 void sctp_datamsg_free(struct sctp_datamsg *); 536 void sctp_datamsg_put(struct sctp_datamsg *); 537 void sctp_chunk_fail(struct sctp_chunk *, int error); 538 int sctp_chunk_abandoned(struct sctp_chunk *); 539 540 /* RFC2960 1.4 Key Terms 541 * 542 * o Chunk: A unit of information within an SCTP packet, consisting of 543 * a chunk header and chunk-specific content. 544 * 545 * As a matter of convenience, we remember the SCTP common header for 546 * each chunk as well as a few other header pointers... 547 */ 548 struct sctp_chunk { 549 struct list_head list; 550 551 atomic_t refcnt; 552 553 /* This is our link to the per-transport transmitted list. */ 554 struct list_head transmitted_list; 555 556 /* This field is used by chunks that hold fragmented data. 557 * For the first fragment this is the list that holds the rest of 558 * fragments. For the remaining fragments, this is the link to the 559 * frag_list maintained in the first fragment. 560 */ 561 struct list_head frag_list; 562 563 /* This points to the sk_buff containing the actual data. */ 564 struct sk_buff *skb; 565 566 /* These are the SCTP headers by reverse order in a packet. 567 * Note that some of these may happen more than once. In that 568 * case, we point at the "current" one, whatever that means 569 * for that level of header. 570 */ 571 572 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 573 union sctp_params param_hdr; 574 union { 575 __u8 *v; 576 struct sctp_datahdr *data_hdr; 577 struct sctp_inithdr *init_hdr; 578 struct sctp_sackhdr *sack_hdr; 579 struct sctp_heartbeathdr *hb_hdr; 580 struct sctp_sender_hb_info *hbs_hdr; 581 struct sctp_shutdownhdr *shutdown_hdr; 582 struct sctp_signed_cookie *cookie_hdr; 583 struct sctp_ecnehdr *ecne_hdr; 584 struct sctp_cwrhdr *ecn_cwr_hdr; 585 struct sctp_errhdr *err_hdr; 586 struct sctp_addiphdr *addip_hdr; 587 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 588 struct sctp_authhdr *auth_hdr; 589 } subh; 590 591 __u8 *chunk_end; 592 593 struct sctp_chunkhdr *chunk_hdr; 594 struct sctphdr *sctp_hdr; 595 596 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 597 struct sctp_sndrcvinfo sinfo; 598 599 /* Which association does this belong to? */ 600 struct sctp_association *asoc; 601 602 /* What endpoint received this chunk? */ 603 struct sctp_ep_common *rcvr; 604 605 /* We fill this in if we are calculating RTT. */ 606 unsigned long sent_at; 607 608 /* What is the origin IP address for this chunk? */ 609 union sctp_addr source; 610 /* Destination address for this chunk. */ 611 union sctp_addr dest; 612 613 /* For outbound message, track all fragments for SEND_FAILED. */ 614 struct sctp_datamsg *msg; 615 616 /* For an inbound chunk, this tells us where it came from. 617 * For an outbound chunk, it tells us where we'd like it to 618 * go. It is NULL if we have no preference. 619 */ 620 struct sctp_transport *transport; 621 622 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 623 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 624 * spec violates the principle premis that all chunks are processed 625 * in order. 626 */ 627 struct sk_buff *auth_chunk; 628 629 #define SCTP_CAN_FRTX 0x0 630 #define SCTP_NEED_FRTX 0x1 631 #define SCTP_DONT_FRTX 0x2 632 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 633 resent:1, /* Has this chunk ever been resent. */ 634 has_tsn:1, /* Does this chunk have a TSN yet? */ 635 has_ssn:1, /* Does this chunk have a SSN yet? */ 636 singleton:1, /* Only chunk in the packet? */ 637 end_of_packet:1, /* Last chunk in the packet? */ 638 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 639 pdiscard:1, /* Discard the whole packet now? */ 640 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 641 data_accepted:1, /* At least 1 chunk accepted */ 642 auth:1, /* IN: was auth'ed | OUT: needs auth */ 643 has_asconf:1, /* IN: have seen an asconf before */ 644 tsn_missing_report:2, /* Data chunk missing counter. */ 645 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 646 }; 647 648 void sctp_chunk_hold(struct sctp_chunk *); 649 void sctp_chunk_put(struct sctp_chunk *); 650 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 651 struct iov_iter *from); 652 void sctp_chunk_free(struct sctp_chunk *); 653 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 654 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 655 const struct sctp_association *, 656 struct sock *); 657 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 658 union sctp_addr *); 659 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 660 661 enum { 662 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 663 SCTP_ADDR_SRC, /* address can be used as source */ 664 SCTP_ADDR_DEL, /* address about to be deleted */ 665 }; 666 667 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 668 struct sctp_sockaddr_entry { 669 struct list_head list; 670 struct rcu_head rcu; 671 union sctp_addr a; 672 __u8 state; 673 __u8 valid; 674 }; 675 676 #define SCTP_ADDRESS_TICK_DELAY 500 677 678 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 679 680 /* This structure holds lists of chunks as we are assembling for 681 * transmission. 682 */ 683 struct sctp_packet { 684 /* These are the SCTP header values (host order) for the packet. */ 685 __u16 source_port; 686 __u16 destination_port; 687 __u32 vtag; 688 689 /* This contains the payload chunks. */ 690 struct list_head chunk_list; 691 692 /* This is the overhead of the sctp and ip headers. */ 693 size_t overhead; 694 /* This is the total size of all chunks INCLUDING padding. */ 695 size_t size; 696 697 /* The packet is destined for this transport address. 698 * The function we finally use to pass down to the next lower 699 * layer lives in the transport structure. 700 */ 701 struct sctp_transport *transport; 702 703 /* pointer to the auth chunk for this packet */ 704 struct sctp_chunk *auth; 705 706 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 707 has_sack:1, /* This packet contains a SACK chunk. */ 708 has_auth:1, /* This packet contains an AUTH chunk */ 709 has_data:1, /* This packet contains at least 1 DATA chunk */ 710 ipfragok:1; /* So let ip fragment this packet */ 711 }; 712 713 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 714 struct sctp_transport *, 715 __u16 sport, __u16 dport); 716 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 717 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 718 struct sctp_chunk *, int); 719 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 720 struct sctp_chunk *); 721 int sctp_packet_transmit(struct sctp_packet *); 722 void sctp_packet_free(struct sctp_packet *); 723 724 static inline int sctp_packet_empty(struct sctp_packet *packet) 725 { 726 return packet->size == packet->overhead; 727 } 728 729 /* This represents a remote transport address. 730 * For local transport addresses, we just use union sctp_addr. 731 * 732 * RFC2960 Section 1.4 Key Terms 733 * 734 * o Transport address: A Transport Address is traditionally defined 735 * by Network Layer address, Transport Layer protocol and Transport 736 * Layer port number. In the case of SCTP running over IP, a 737 * transport address is defined by the combination of an IP address 738 * and an SCTP port number (where SCTP is the Transport protocol). 739 * 740 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 741 * 742 * o The sender keeps a separate congestion control parameter set for 743 * each of the destination addresses it can send to (not each 744 * source-destination pair but for each destination). The parameters 745 * should decay if the address is not used for a long enough time 746 * period. 747 * 748 */ 749 struct sctp_transport { 750 /* A list of transports. */ 751 struct list_head transports; 752 753 /* Reference counting. */ 754 atomic_t refcnt; 755 __u32 dead:1, 756 /* RTO-Pending : A flag used to track if one of the DATA 757 * chunks sent to this address is currently being 758 * used to compute a RTT. If this flag is 0, 759 * the next DATA chunk sent to this destination 760 * should be used to compute a RTT and this flag 761 * should be set. Every time the RTT 762 * calculation completes (i.e. the DATA chunk 763 * is SACK'd) clear this flag. 764 */ 765 rto_pending:1, 766 767 /* 768 * hb_sent : a flag that signals that we have a pending 769 * heartbeat. 770 */ 771 hb_sent:1, 772 773 /* Is the Path MTU update pending on this tranport */ 774 pmtu_pending:1; 775 776 /* Has this transport moved the ctsn since we last sacked */ 777 __u32 sack_generation; 778 u32 dst_cookie; 779 780 struct flowi fl; 781 782 /* This is the peer's IP address and port. */ 783 union sctp_addr ipaddr; 784 785 /* These are the functions we call to handle LLP stuff. */ 786 struct sctp_af *af_specific; 787 788 /* Which association do we belong to? */ 789 struct sctp_association *asoc; 790 791 /* RFC2960 792 * 793 * 12.3 Per Transport Address Data 794 * 795 * For each destination transport address in the peer's 796 * address list derived from the INIT or INIT ACK chunk, a 797 * number of data elements needs to be maintained including: 798 */ 799 /* RTO : The current retransmission timeout value. */ 800 unsigned long rto; 801 802 __u32 rtt; /* This is the most recent RTT. */ 803 804 /* RTTVAR : The current RTT variation. */ 805 __u32 rttvar; 806 807 /* SRTT : The current smoothed round trip time. */ 808 __u32 srtt; 809 810 /* 811 * These are the congestion stats. 812 */ 813 /* cwnd : The current congestion window. */ 814 __u32 cwnd; /* This is the actual cwnd. */ 815 816 /* ssthresh : The current slow start threshold value. */ 817 __u32 ssthresh; 818 819 /* partial : The tracking method for increase of cwnd when in 820 * bytes acked : congestion avoidance mode (see Section 6.2.2) 821 */ 822 __u32 partial_bytes_acked; 823 824 /* Data that has been sent, but not acknowledged. */ 825 __u32 flight_size; 826 827 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 828 829 /* Destination */ 830 struct dst_entry *dst; 831 /* Source address. */ 832 union sctp_addr saddr; 833 834 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 835 * the destination address every heartbeat interval. 836 */ 837 unsigned long hbinterval; 838 839 /* SACK delay timeout */ 840 unsigned long sackdelay; 841 __u32 sackfreq; 842 843 /* When was the last time that we heard from this transport? We use 844 * this to pick new active and retran paths. 845 */ 846 ktime_t last_time_heard; 847 848 /* Last time(in jiffies) when cwnd is reduced due to the congestion 849 * indication based on ECNE chunk. 850 */ 851 unsigned long last_time_ecne_reduced; 852 853 /* This is the max_retrans value for the transport and will 854 * be initialized from the assocs value. This can be changed 855 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 856 */ 857 __u16 pathmaxrxt; 858 859 /* This is the partially failed retrans value for the transport 860 * and will be initialized from the assocs value. This can be changed 861 * using the SCTP_PEER_ADDR_THLDS socket option 862 */ 863 int pf_retrans; 864 /* PMTU : The current known path MTU. */ 865 __u32 pathmtu; 866 867 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 868 __u32 param_flags; 869 870 /* The number of times INIT has been sent on this transport. */ 871 int init_sent_count; 872 873 /* state : The current state of this destination, 874 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 875 */ 876 int state; 877 878 /* These are the error stats for this destination. */ 879 880 /* Error count : The current error count for this destination. */ 881 unsigned short error_count; 882 883 /* Per : A timer used by each destination. 884 * Destination : 885 * Timer : 886 * 887 * [Everywhere else in the text this is called T3-rtx. -ed] 888 */ 889 struct timer_list T3_rtx_timer; 890 891 /* Heartbeat timer is per destination. */ 892 struct timer_list hb_timer; 893 894 /* Timer to handle ICMP proto unreachable envets */ 895 struct timer_list proto_unreach_timer; 896 897 /* Since we're using per-destination retransmission timers 898 * (see above), we're also using per-destination "transmitted" 899 * queues. This probably ought to be a private struct 900 * accessible only within the outqueue, but it's not, yet. 901 */ 902 struct list_head transmitted; 903 904 /* We build bundle-able packets for this transport here. */ 905 struct sctp_packet packet; 906 907 /* This is the list of transports that have chunks to send. */ 908 struct list_head send_ready; 909 910 /* State information saved for SFR_CACC algorithm. The key 911 * idea in SFR_CACC is to maintain state at the sender on a 912 * per-destination basis when a changeover happens. 913 * char changeover_active; 914 * char cycling_changeover; 915 * __u32 next_tsn_at_change; 916 * char cacc_saw_newack; 917 */ 918 struct { 919 /* An unsigned integer, which stores the next TSN to be 920 * used by the sender, at the moment of changeover. 921 */ 922 __u32 next_tsn_at_change; 923 924 /* A flag which indicates the occurrence of a changeover */ 925 char changeover_active; 926 927 /* A flag which indicates whether the change of primary is 928 * the first switch to this destination address during an 929 * active switch. 930 */ 931 char cycling_changeover; 932 933 /* A temporary flag, which is used during the processing of 934 * a SACK to estimate the causative TSN(s)'s group. 935 */ 936 char cacc_saw_newack; 937 } cacc; 938 939 /* 64-bit random number sent with heartbeat. */ 940 __u64 hb_nonce; 941 942 struct rcu_head rcu; 943 }; 944 945 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 946 gfp_t); 947 void sctp_transport_set_owner(struct sctp_transport *, 948 struct sctp_association *); 949 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 950 struct sctp_sock *); 951 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 952 void sctp_transport_free(struct sctp_transport *); 953 void sctp_transport_reset_timers(struct sctp_transport *); 954 void sctp_transport_hold(struct sctp_transport *); 955 void sctp_transport_put(struct sctp_transport *); 956 void sctp_transport_update_rto(struct sctp_transport *, __u32); 957 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 958 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 959 void sctp_transport_burst_limited(struct sctp_transport *); 960 void sctp_transport_burst_reset(struct sctp_transport *); 961 unsigned long sctp_transport_timeout(struct sctp_transport *); 962 void sctp_transport_reset(struct sctp_transport *); 963 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); 964 void sctp_transport_immediate_rtx(struct sctp_transport *); 965 966 967 /* This is the structure we use to queue packets as they come into 968 * SCTP. We write packets to it and read chunks from it. 969 */ 970 struct sctp_inq { 971 /* This is actually a queue of sctp_chunk each 972 * containing a partially decoded packet. 973 */ 974 struct list_head in_chunk_list; 975 /* This is the packet which is currently off the in queue and is 976 * being worked on through the inbound chunk processing. 977 */ 978 struct sctp_chunk *in_progress; 979 980 /* This is the delayed task to finish delivering inbound 981 * messages. 982 */ 983 struct work_struct immediate; 984 }; 985 986 void sctp_inq_init(struct sctp_inq *); 987 void sctp_inq_free(struct sctp_inq *); 988 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 989 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 990 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 991 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 992 993 /* This is the structure we use to hold outbound chunks. You push 994 * chunks in and they automatically pop out the other end as bundled 995 * packets (it calls (*output_handler)()). 996 * 997 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 998 * and 8.2 of the v13 draft. 999 * 1000 * It handles retransmissions. The connection to the timeout portion 1001 * of the state machine is through sctp_..._timeout() and timeout_handler. 1002 * 1003 * If you feed it SACKs, it will eat them. 1004 * 1005 * If you give it big chunks, it will fragment them. 1006 * 1007 * It assigns TSN's to data chunks. This happens at the last possible 1008 * instant before transmission. 1009 * 1010 * When free()'d, it empties itself out via output_handler(). 1011 */ 1012 struct sctp_outq { 1013 struct sctp_association *asoc; 1014 1015 /* Data pending that has never been transmitted. */ 1016 struct list_head out_chunk_list; 1017 1018 unsigned int out_qlen; /* Total length of queued data chunks. */ 1019 1020 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1021 unsigned int error; 1022 1023 /* These are control chunks we want to send. */ 1024 struct list_head control_chunk_list; 1025 1026 /* These are chunks that have been sacked but are above the 1027 * CTSN, or cumulative tsn ack point. 1028 */ 1029 struct list_head sacked; 1030 1031 /* Put chunks on this list to schedule them for 1032 * retransmission. 1033 */ 1034 struct list_head retransmit; 1035 1036 /* Put chunks on this list to save them for FWD TSN processing as 1037 * they were abandoned. 1038 */ 1039 struct list_head abandoned; 1040 1041 /* How many unackd bytes do we have in-flight? */ 1042 __u32 outstanding_bytes; 1043 1044 /* Are we doing fast-rtx on this queue */ 1045 char fast_rtx; 1046 1047 /* Corked? */ 1048 char cork; 1049 }; 1050 1051 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1052 void sctp_outq_teardown(struct sctp_outq *); 1053 void sctp_outq_free(struct sctp_outq*); 1054 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1055 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1056 int sctp_outq_is_empty(const struct sctp_outq *); 1057 void sctp_outq_restart(struct sctp_outq *); 1058 1059 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1060 sctp_retransmit_reason_t); 1061 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1062 int sctp_outq_uncork(struct sctp_outq *); 1063 /* Uncork and flush an outqueue. */ 1064 static inline void sctp_outq_cork(struct sctp_outq *q) 1065 { 1066 q->cork = 1; 1067 } 1068 1069 /* These bind address data fields common between endpoints and associations */ 1070 struct sctp_bind_addr { 1071 1072 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1073 * 1074 * SCTP Port: The local SCTP port number the endpoint is 1075 * bound to. 1076 */ 1077 __u16 port; 1078 1079 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1080 * 1081 * Address List: The list of IP addresses that this instance 1082 * has bound. This information is passed to one's 1083 * peer(s) in INIT and INIT ACK chunks. 1084 */ 1085 struct list_head address_list; 1086 }; 1087 1088 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1089 void sctp_bind_addr_free(struct sctp_bind_addr *); 1090 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1091 const struct sctp_bind_addr *src, 1092 sctp_scope_t scope, gfp_t gfp, 1093 int flags); 1094 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1095 const struct sctp_bind_addr *src, 1096 gfp_t gfp); 1097 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1098 __u8 addr_state, gfp_t gfp); 1099 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1100 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1101 struct sctp_sock *); 1102 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1103 struct sctp_sock *, struct sctp_sock *); 1104 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1105 const union sctp_addr *addr); 1106 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1107 const union sctp_addr *addrs, 1108 int addrcnt, 1109 struct sctp_sock *opt); 1110 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1111 int *addrs_len, 1112 gfp_t gfp); 1113 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1114 __u16 port, gfp_t gfp); 1115 1116 sctp_scope_t sctp_scope(const union sctp_addr *); 1117 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1118 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1119 int sctp_is_ep_boundall(struct sock *sk); 1120 1121 1122 /* What type of endpoint? */ 1123 typedef enum { 1124 SCTP_EP_TYPE_SOCKET, 1125 SCTP_EP_TYPE_ASSOCIATION, 1126 } sctp_endpoint_type_t; 1127 1128 /* 1129 * A common base class to bridge the implmentation view of a 1130 * socket (usually listening) endpoint versus an association's 1131 * local endpoint. 1132 * This common structure is useful for several purposes: 1133 * 1) Common interface for lookup routines. 1134 * a) Subfunctions work for either endpoint or association 1135 * b) Single interface to lookup allows hiding the lookup lock rather 1136 * than acquiring it externally. 1137 * 2) Common interface for the inbound chunk handling/state machine. 1138 * 3) Common object handling routines for reference counting, etc. 1139 * 4) Disentangle association lookup from endpoint lookup, where we 1140 * do not have to find our endpoint to find our association. 1141 * 1142 */ 1143 1144 struct sctp_ep_common { 1145 /* Fields to help us manage our entries in the hash tables. */ 1146 struct hlist_node node; 1147 int hashent; 1148 1149 /* Runtime type information. What kind of endpoint is this? */ 1150 sctp_endpoint_type_t type; 1151 1152 /* Some fields to help us manage this object. 1153 * refcnt - Reference count access to this object. 1154 * dead - Do not attempt to use this object. 1155 */ 1156 atomic_t refcnt; 1157 bool dead; 1158 1159 /* What socket does this endpoint belong to? */ 1160 struct sock *sk; 1161 1162 /* This is where we receive inbound chunks. */ 1163 struct sctp_inq inqueue; 1164 1165 /* This substructure includes the defining parameters of the 1166 * endpoint: 1167 * bind_addr.port is our shared port number. 1168 * bind_addr.address_list is our set of local IP addresses. 1169 */ 1170 struct sctp_bind_addr bind_addr; 1171 }; 1172 1173 1174 /* RFC Section 1.4 Key Terms 1175 * 1176 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1177 * multi-homed host, an SCTP endpoint is represented to its peers as a 1178 * combination of a set of eligible destination transport addresses to 1179 * which SCTP packets can be sent and a set of eligible source 1180 * transport addresses from which SCTP packets can be received. 1181 * All transport addresses used by an SCTP endpoint must use the 1182 * same port number, but can use multiple IP addresses. A transport 1183 * address used by an SCTP endpoint must not be used by another 1184 * SCTP endpoint. In other words, a transport address is unique 1185 * to an SCTP endpoint. 1186 * 1187 * From an implementation perspective, each socket has one of these. 1188 * A TCP-style socket will have exactly one association on one of 1189 * these. An UDP-style socket will have multiple associations hanging 1190 * off one of these. 1191 */ 1192 1193 struct sctp_endpoint { 1194 /* Common substructure for endpoint and association. */ 1195 struct sctp_ep_common base; 1196 1197 /* Associations: A list of current associations and mappings 1198 * to the data consumers for each association. This 1199 * may be in the form of a hash table or other 1200 * implementation dependent structure. The data 1201 * consumers may be process identification 1202 * information such as file descriptors, named pipe 1203 * pointer, or table pointers dependent on how SCTP 1204 * is implemented. 1205 */ 1206 /* This is really a list of struct sctp_association entries. */ 1207 struct list_head asocs; 1208 1209 /* Secret Key: A secret key used by this endpoint to compute 1210 * the MAC. This SHOULD be a cryptographic quality 1211 * random number with a sufficient length. 1212 * Discussion in [RFC1750] can be helpful in 1213 * selection of the key. 1214 */ 1215 __u8 secret_key[SCTP_SECRET_SIZE]; 1216 1217 /* digest: This is a digest of the sctp cookie. This field is 1218 * only used on the receive path when we try to validate 1219 * that the cookie has not been tampered with. We put 1220 * this here so we pre-allocate this once and can re-use 1221 * on every receive. 1222 */ 1223 __u8 *digest; 1224 1225 /* sendbuf acct. policy. */ 1226 __u32 sndbuf_policy; 1227 1228 /* rcvbuf acct. policy. */ 1229 __u32 rcvbuf_policy; 1230 1231 /* SCTP AUTH: array of the HMACs that will be allocated 1232 * we need this per association so that we don't serialize 1233 */ 1234 struct crypto_hash **auth_hmacs; 1235 1236 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1237 struct sctp_hmac_algo_param *auth_hmacs_list; 1238 1239 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1240 struct sctp_chunks_param *auth_chunk_list; 1241 1242 /* SCTP-AUTH: endpoint shared keys */ 1243 struct list_head endpoint_shared_keys; 1244 __u16 active_key_id; 1245 __u8 auth_enable; 1246 }; 1247 1248 /* Recover the outter endpoint structure. */ 1249 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1250 { 1251 struct sctp_endpoint *ep; 1252 1253 ep = container_of(base, struct sctp_endpoint, base); 1254 return ep; 1255 } 1256 1257 /* These are function signatures for manipulating endpoints. */ 1258 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1259 void sctp_endpoint_free(struct sctp_endpoint *); 1260 void sctp_endpoint_put(struct sctp_endpoint *); 1261 void sctp_endpoint_hold(struct sctp_endpoint *); 1262 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1263 struct sctp_association *sctp_endpoint_lookup_assoc( 1264 const struct sctp_endpoint *ep, 1265 const union sctp_addr *paddr, 1266 struct sctp_transport **); 1267 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1268 const union sctp_addr *); 1269 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1270 struct net *, const union sctp_addr *); 1271 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1272 const union sctp_addr *paddr); 1273 1274 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1275 const struct sctp_association *asoc, 1276 sctp_cid_t, sctp_init_chunk_t *peer_init, 1277 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1278 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1279 const union sctp_addr *peer, 1280 sctp_init_chunk_t *init, gfp_t gfp); 1281 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1282 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1283 1284 struct sctp_inithdr_host { 1285 __u32 init_tag; 1286 __u32 a_rwnd; 1287 __u16 num_outbound_streams; 1288 __u16 num_inbound_streams; 1289 __u32 initial_tsn; 1290 }; 1291 1292 /* SCTP_GET_ASSOC_STATS counters */ 1293 struct sctp_priv_assoc_stats { 1294 /* Maximum observed rto in the association during subsequent 1295 * observations. Value is set to 0 if no RTO measurement took place 1296 * The transport where the max_rto was observed is returned in 1297 * obs_rto_ipaddr 1298 */ 1299 struct sockaddr_storage obs_rto_ipaddr; 1300 __u64 max_obs_rto; 1301 /* Total In and Out SACKs received and sent */ 1302 __u64 isacks; 1303 __u64 osacks; 1304 /* Total In and Out packets received and sent */ 1305 __u64 opackets; 1306 __u64 ipackets; 1307 /* Total retransmitted chunks */ 1308 __u64 rtxchunks; 1309 /* TSN received > next expected */ 1310 __u64 outofseqtsns; 1311 /* Duplicate Chunks received */ 1312 __u64 idupchunks; 1313 /* Gap Ack Blocks received */ 1314 __u64 gapcnt; 1315 /* Unordered data chunks sent and received */ 1316 __u64 ouodchunks; 1317 __u64 iuodchunks; 1318 /* Ordered data chunks sent and received */ 1319 __u64 oodchunks; 1320 __u64 iodchunks; 1321 /* Control chunks sent and received */ 1322 __u64 octrlchunks; 1323 __u64 ictrlchunks; 1324 }; 1325 1326 /* RFC2960 1327 * 1328 * 12. Recommended Transmission Control Block (TCB) Parameters 1329 * 1330 * This section details a recommended set of parameters that should 1331 * be contained within the TCB for an implementation. This section is 1332 * for illustrative purposes and should not be deemed as requirements 1333 * on an implementation or as an exhaustive list of all parameters 1334 * inside an SCTP TCB. Each implementation may need its own additional 1335 * parameters for optimization. 1336 */ 1337 1338 1339 /* Here we have information about each individual association. */ 1340 struct sctp_association { 1341 1342 /* A base structure common to endpoint and association. 1343 * In this context, it represents the associations's view 1344 * of the local endpoint of the association. 1345 */ 1346 struct sctp_ep_common base; 1347 1348 /* Associations on the same socket. */ 1349 struct list_head asocs; 1350 1351 /* association id. */ 1352 sctp_assoc_t assoc_id; 1353 1354 /* This is our parent endpoint. */ 1355 struct sctp_endpoint *ep; 1356 1357 /* These are those association elements needed in the cookie. */ 1358 struct sctp_cookie c; 1359 1360 /* This is all information about our peer. */ 1361 struct { 1362 /* transport_addr_list 1363 * 1364 * Peer : A list of SCTP transport addresses that the 1365 * Transport : peer is bound to. This information is derived 1366 * Address : from the INIT or INIT ACK and is used to 1367 * List : associate an inbound packet with a given 1368 * : association. Normally this information is 1369 * : hashed or keyed for quick lookup and access 1370 * : of the TCB. 1371 * : The list is also initialized with the list 1372 * : of addresses passed with the sctp_connectx() 1373 * : call. 1374 * 1375 * It is a list of SCTP_transport's. 1376 */ 1377 struct list_head transport_addr_list; 1378 1379 /* rwnd 1380 * 1381 * Peer Rwnd : Current calculated value of the peer's rwnd. 1382 */ 1383 __u32 rwnd; 1384 1385 /* transport_count 1386 * 1387 * Peer : A count of the number of peer addresses 1388 * Transport : in the Peer Transport Address List. 1389 * Address : 1390 * Count : 1391 */ 1392 __u16 transport_count; 1393 1394 /* port 1395 * The transport layer port number. 1396 */ 1397 __u16 port; 1398 1399 /* primary_path 1400 * 1401 * Primary : This is the current primary destination 1402 * Path : transport address of the peer endpoint. It 1403 * : may also specify a source transport address 1404 * : on this endpoint. 1405 * 1406 * All of these paths live on transport_addr_list. 1407 * 1408 * At the bakeoffs, we discovered that the intent of 1409 * primaryPath is that it only changes when the ULP 1410 * asks to have it changed. We add the activePath to 1411 * designate the connection we are currently using to 1412 * transmit new data and most control chunks. 1413 */ 1414 struct sctp_transport *primary_path; 1415 1416 /* Cache the primary path address here, when we 1417 * need a an address for msg_name. 1418 */ 1419 union sctp_addr primary_addr; 1420 1421 /* active_path 1422 * The path that we are currently using to 1423 * transmit new data and most control chunks. 1424 */ 1425 struct sctp_transport *active_path; 1426 1427 /* retran_path 1428 * 1429 * RFC2960 6.4 Multi-homed SCTP Endpoints 1430 * ... 1431 * Furthermore, when its peer is multi-homed, an 1432 * endpoint SHOULD try to retransmit a chunk to an 1433 * active destination transport address that is 1434 * different from the last destination address to 1435 * which the DATA chunk was sent. 1436 */ 1437 struct sctp_transport *retran_path; 1438 1439 /* Pointer to last transport I have sent on. */ 1440 struct sctp_transport *last_sent_to; 1441 1442 /* This is the last transport I have received DATA on. */ 1443 struct sctp_transport *last_data_from; 1444 1445 /* 1446 * Mapping An array of bits or bytes indicating which out of 1447 * Array order TSN's have been received (relative to the 1448 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1449 * order packets have been received, this array 1450 * will be set to all zero. This structure may be 1451 * in the form of a circular buffer or bit array. 1452 * 1453 * Last Rcvd : This is the last TSN received in 1454 * TSN : sequence. This value is set initially by 1455 * : taking the peer's Initial TSN, received in 1456 * : the INIT or INIT ACK chunk, and subtracting 1457 * : one from it. 1458 * 1459 * Throughout most of the specification this is called the 1460 * "Cumulative TSN ACK Point". In this case, we 1461 * ignore the advice in 12.2 in favour of the term 1462 * used in the bulk of the text. This value is hidden 1463 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1464 */ 1465 struct sctp_tsnmap tsn_map; 1466 1467 /* This mask is used to disable sending the ASCONF chunk 1468 * with specified parameter to peer. 1469 */ 1470 __be16 addip_disabled_mask; 1471 1472 /* These are capabilities which our peer advertised. */ 1473 __u8 ecn_capable:1, /* Can peer do ECN? */ 1474 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1475 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1476 hostname_address:1, /* Peer understands DNS addresses? */ 1477 asconf_capable:1, /* Does peer support ADDIP? */ 1478 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1479 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1480 1481 /* Ack State : This flag indicates if the next received 1482 * : packet is to be responded to with a 1483 * : SACK. This is initializedto 0. When a packet 1484 * : is received it is incremented. If this value 1485 * : reaches 2 or more, a SACK is sent and the 1486 * : value is reset to 0. Note: This is used only 1487 * : when no DATA chunks are received out of 1488 * : order. When DATA chunks are out of order, 1489 * : SACK's are not delayed (see Section 6). 1490 */ 1491 __u8 sack_needed; /* Do we need to sack the peer? */ 1492 __u32 sack_cnt; 1493 __u32 sack_generation; 1494 1495 __u32 adaptation_ind; /* Adaptation Code point. */ 1496 1497 struct sctp_inithdr_host i; 1498 void *cookie; 1499 int cookie_len; 1500 1501 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1502 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1503 * Initial TSN Value minus 1 1504 */ 1505 __u32 addip_serial; 1506 1507 /* SCTP-AUTH: We need to know pears random number, hmac list 1508 * and authenticated chunk list. All that is part of the 1509 * cookie and these are just pointers to those locations 1510 */ 1511 sctp_random_param_t *peer_random; 1512 sctp_chunks_param_t *peer_chunks; 1513 sctp_hmac_algo_param_t *peer_hmacs; 1514 } peer; 1515 1516 /* State : A state variable indicating what state the 1517 * : association is in, i.e. COOKIE-WAIT, 1518 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1519 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1520 * 1521 * Note: No "CLOSED" state is illustrated since if a 1522 * association is "CLOSED" its TCB SHOULD be removed. 1523 * 1524 * In this implementation we DO have a CLOSED 1525 * state which is used during initiation and shutdown. 1526 * 1527 * State takes values from SCTP_STATE_*. 1528 */ 1529 sctp_state_t state; 1530 1531 /* Overall : The overall association error count. 1532 * Error Count : [Clear this any time I get something.] 1533 */ 1534 int overall_error_count; 1535 1536 /* The cookie life I award for any cookie. */ 1537 ktime_t cookie_life; 1538 1539 /* These are the association's initial, max, and min RTO values. 1540 * These values will be initialized by system defaults, but can 1541 * be modified via the SCTP_RTOINFO socket option. 1542 */ 1543 unsigned long rto_initial; 1544 unsigned long rto_max; 1545 unsigned long rto_min; 1546 1547 /* Maximum number of new data packets that can be sent in a burst. */ 1548 int max_burst; 1549 1550 /* This is the max_retrans value for the association. This value will 1551 * be initialized initialized from system defaults, but can be 1552 * modified by the SCTP_ASSOCINFO socket option. 1553 */ 1554 int max_retrans; 1555 1556 /* This is the partially failed retrans value for the transport 1557 * and will be initialized from the assocs value. This can be 1558 * changed using the SCTP_PEER_ADDR_THLDS socket option 1559 */ 1560 int pf_retrans; 1561 1562 /* Maximum number of times the endpoint will retransmit INIT */ 1563 __u16 max_init_attempts; 1564 1565 /* How many times have we resent an INIT? */ 1566 __u16 init_retries; 1567 1568 /* The largest timeout or RTO value to use in attempting an INIT */ 1569 unsigned long max_init_timeo; 1570 1571 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1572 * the destination address every heartbeat interval. This value 1573 * will be inherited by all new transports. 1574 */ 1575 unsigned long hbinterval; 1576 1577 /* This is the max_retrans value for new transports in the 1578 * association. 1579 */ 1580 __u16 pathmaxrxt; 1581 1582 /* Flag that path mtu update is pending */ 1583 __u8 pmtu_pending; 1584 1585 /* Association : The smallest PMTU discovered for all of the 1586 * PMTU : peer's transport addresses. 1587 */ 1588 __u32 pathmtu; 1589 1590 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1591 __u32 param_flags; 1592 1593 __u32 sackfreq; 1594 /* SACK delay timeout */ 1595 unsigned long sackdelay; 1596 1597 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1598 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1599 1600 /* Transport to which SHUTDOWN chunk was last sent. */ 1601 struct sctp_transport *shutdown_last_sent_to; 1602 1603 /* Transport to which INIT chunk was last sent. */ 1604 struct sctp_transport *init_last_sent_to; 1605 1606 /* How many times have we resent a SHUTDOWN */ 1607 int shutdown_retries; 1608 1609 /* Next TSN : The next TSN number to be assigned to a new 1610 * : DATA chunk. This is sent in the INIT or INIT 1611 * : ACK chunk to the peer and incremented each 1612 * : time a DATA chunk is assigned a TSN 1613 * : (normally just prior to transmit or during 1614 * : fragmentation). 1615 */ 1616 __u32 next_tsn; 1617 1618 /* 1619 * Last Rcvd : This is the last TSN received in sequence. This value 1620 * TSN : is set initially by taking the peer's Initial TSN, 1621 * : received in the INIT or INIT ACK chunk, and 1622 * : subtracting one from it. 1623 * 1624 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1625 */ 1626 1627 __u32 ctsn_ack_point; 1628 1629 /* PR-SCTP Advanced.Peer.Ack.Point */ 1630 __u32 adv_peer_ack_point; 1631 1632 /* Highest TSN that is acknowledged by incoming SACKs. */ 1633 __u32 highest_sacked; 1634 1635 /* TSN marking the fast recovery exit point */ 1636 __u32 fast_recovery_exit; 1637 1638 /* Flag to track the current fast recovery state */ 1639 __u8 fast_recovery; 1640 1641 /* The number of unacknowledged data chunks. Reported through 1642 * the SCTP_STATUS sockopt. 1643 */ 1644 __u16 unack_data; 1645 1646 /* The total number of data chunks that we've had to retransmit 1647 * as the result of a T3 timer expiration 1648 */ 1649 __u32 rtx_data_chunks; 1650 1651 /* This is the association's receive buffer space. This value is used 1652 * to set a_rwnd field in an INIT or a SACK chunk. 1653 */ 1654 __u32 rwnd; 1655 1656 /* This is the last advertised value of rwnd over a SACK chunk. */ 1657 __u32 a_rwnd; 1658 1659 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1660 * to slop over a maximum of the association's frag_point. 1661 */ 1662 __u32 rwnd_over; 1663 1664 /* Keeps treack of rwnd pressure. This happens when we have 1665 * a window, but not recevie buffer (i.e small packets). This one 1666 * is releases slowly (1 PMTU at a time ). 1667 */ 1668 __u32 rwnd_press; 1669 1670 /* This is the sndbuf size in use for the association. 1671 * This corresponds to the sndbuf size for the association, 1672 * as specified in the sk->sndbuf. 1673 */ 1674 int sndbuf_used; 1675 1676 /* This is the amount of memory that this association has allocated 1677 * in the receive path at any given time. 1678 */ 1679 atomic_t rmem_alloc; 1680 1681 /* This is the wait queue head for send requests waiting on 1682 * the association sndbuf space. 1683 */ 1684 wait_queue_head_t wait; 1685 1686 /* The message size at which SCTP fragmentation will occur. */ 1687 __u32 frag_point; 1688 __u32 user_frag; 1689 1690 /* Counter used to count INIT errors. */ 1691 int init_err_counter; 1692 1693 /* Count the number of INIT cycles (for doubling timeout). */ 1694 int init_cycle; 1695 1696 /* Default send parameters. */ 1697 __u16 default_stream; 1698 __u16 default_flags; 1699 __u32 default_ppid; 1700 __u32 default_context; 1701 __u32 default_timetolive; 1702 1703 /* Default receive parameters */ 1704 __u32 default_rcv_context; 1705 1706 /* This tracks outbound ssn for a given stream. */ 1707 struct sctp_ssnmap *ssnmap; 1708 1709 /* All outbound chunks go through this structure. */ 1710 struct sctp_outq outqueue; 1711 1712 /* A smart pipe that will handle reordering and fragmentation, 1713 * as well as handle passing events up to the ULP. 1714 */ 1715 struct sctp_ulpq ulpq; 1716 1717 /* Last TSN that caused an ECNE Chunk to be sent. */ 1718 __u32 last_ecne_tsn; 1719 1720 /* Last TSN that caused a CWR Chunk to be sent. */ 1721 __u32 last_cwr_tsn; 1722 1723 /* How many duplicated TSNs have we seen? */ 1724 int numduptsns; 1725 1726 /* These are to support 1727 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1728 * and Enforcement of Flow and Message Limits" 1729 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1730 * or "ADDIP" for short. 1731 */ 1732 1733 1734 1735 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1736 * 1737 * R1) One and only one ASCONF Chunk MAY be in transit and 1738 * unacknowledged at any one time. If a sender, after sending 1739 * an ASCONF chunk, decides it needs to transfer another 1740 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1741 * returns from the previous ASCONF Chunk before sending a 1742 * subsequent ASCONF. Note this restriction binds each side, 1743 * so at any time two ASCONF may be in-transit on any given 1744 * association (one sent from each endpoint). 1745 * 1746 * [This is our one-and-only-one ASCONF in flight. If we do 1747 * not have an ASCONF in flight, this is NULL.] 1748 */ 1749 struct sctp_chunk *addip_last_asconf; 1750 1751 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1752 * 1753 * This is needed to implement itmes E1 - E4 of the updated 1754 * spec. Here is the justification: 1755 * 1756 * Since the peer may bundle multiple ASCONF chunks toward us, 1757 * we now need the ability to cache multiple ACKs. The section 1758 * describes in detail how they are cached and cleaned up. 1759 */ 1760 struct list_head asconf_ack_list; 1761 1762 /* These ASCONF chunks are waiting to be sent. 1763 * 1764 * These chunaks can't be pushed to outqueue until receiving 1765 * ASCONF_ACK for the previous ASCONF indicated by 1766 * addip_last_asconf, so as to guarantee that only one ASCONF 1767 * is in flight at any time. 1768 * 1769 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1770 * 1771 * In defining the ASCONF Chunk transfer procedures, it is 1772 * essential that these transfers MUST NOT cause congestion 1773 * within the network. To achieve this, we place these 1774 * restrictions on the transfer of ASCONF Chunks: 1775 * 1776 * R1) One and only one ASCONF Chunk MAY be in transit and 1777 * unacknowledged at any one time. If a sender, after sending 1778 * an ASCONF chunk, decides it needs to transfer another 1779 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1780 * returns from the previous ASCONF Chunk before sending a 1781 * subsequent ASCONF. Note this restriction binds each side, 1782 * so at any time two ASCONF may be in-transit on any given 1783 * association (one sent from each endpoint). 1784 * 1785 * 1786 * [I really think this is EXACTLY the sort of intelligence 1787 * which already resides in sctp_outq. Please move this 1788 * queue and its supporting logic down there. --piggy] 1789 */ 1790 struct list_head addip_chunk_list; 1791 1792 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1793 * 1794 * A2) A serial number should be assigned to the Chunk. The 1795 * serial number SHOULD be a monotonically increasing 1796 * number. The serial number SHOULD be initialized at 1797 * the start of the association to the same value as the 1798 * Initial TSN and every time a new ASCONF chunk is created 1799 * it is incremented by one after assigning the serial number 1800 * to the newly created chunk. 1801 * 1802 * ADDIP 1803 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1804 * 1805 * Serial Number : 32 bits (unsigned integer) 1806 * 1807 * This value represents a Serial Number for the ASCONF 1808 * Chunk. The valid range of Serial Number is from 0 to 1809 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1810 * after reaching 4294967295. 1811 */ 1812 __u32 addip_serial; 1813 int src_out_of_asoc_ok; 1814 union sctp_addr *asconf_addr_del_pending; 1815 struct sctp_transport *new_transport; 1816 1817 /* SCTP AUTH: list of the endpoint shared keys. These 1818 * keys are provided out of band by the user applicaton 1819 * and can't change during the lifetime of the association 1820 */ 1821 struct list_head endpoint_shared_keys; 1822 1823 /* SCTP AUTH: 1824 * The current generated assocaition shared key (secret) 1825 */ 1826 struct sctp_auth_bytes *asoc_shared_key; 1827 1828 /* SCTP AUTH: hmac id of the first peer requested algorithm 1829 * that we support. 1830 */ 1831 __u16 default_hmac_id; 1832 1833 __u16 active_key_id; 1834 1835 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1836 temp:1; /* Is it a temporary association? */ 1837 1838 struct sctp_priv_assoc_stats stats; 1839 }; 1840 1841 1842 /* An eyecatcher for determining if we are really looking at an 1843 * association data structure. 1844 */ 1845 enum { 1846 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1847 }; 1848 1849 /* Recover the outter association structure. */ 1850 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1851 { 1852 struct sctp_association *asoc; 1853 1854 asoc = container_of(base, struct sctp_association, base); 1855 return asoc; 1856 } 1857 1858 /* These are function signatures for manipulating associations. */ 1859 1860 1861 struct sctp_association * 1862 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1863 sctp_scope_t scope, gfp_t gfp); 1864 void sctp_association_free(struct sctp_association *); 1865 void sctp_association_put(struct sctp_association *); 1866 void sctp_association_hold(struct sctp_association *); 1867 1868 struct sctp_transport *sctp_assoc_choose_alter_transport( 1869 struct sctp_association *, struct sctp_transport *); 1870 void sctp_assoc_update_retran_path(struct sctp_association *); 1871 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1872 const union sctp_addr *); 1873 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1874 const union sctp_addr *laddr); 1875 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1876 const union sctp_addr *address, 1877 const gfp_t gfp, 1878 const int peer_state); 1879 void sctp_assoc_del_peer(struct sctp_association *asoc, 1880 const union sctp_addr *addr); 1881 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1882 struct sctp_transport *peer); 1883 void sctp_assoc_control_transport(struct sctp_association *, 1884 struct sctp_transport *, 1885 sctp_transport_cmd_t, sctp_sn_error_t); 1886 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1887 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1888 struct net *, 1889 const union sctp_addr *, 1890 const union sctp_addr *); 1891 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1892 void sctp_assoc_update(struct sctp_association *old, 1893 struct sctp_association *new); 1894 1895 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1896 1897 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *); 1898 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1899 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1900 void sctp_assoc_set_primary(struct sctp_association *, 1901 struct sctp_transport *); 1902 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1903 struct sctp_transport *); 1904 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1905 sctp_scope_t, gfp_t); 1906 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1907 struct sctp_cookie*, 1908 gfp_t gfp); 1909 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1910 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1911 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1912 const struct sctp_association *asoc, 1913 __be32 serial); 1914 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1915 1916 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1917 const union sctp_addr *ss2); 1918 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1919 1920 /* A convenience structure to parse out SCTP specific CMSGs. */ 1921 typedef struct sctp_cmsgs { 1922 struct sctp_initmsg *init; 1923 struct sctp_sndrcvinfo *srinfo; 1924 struct sctp_sndinfo *sinfo; 1925 } sctp_cmsgs_t; 1926 1927 /* Structure for tracking memory objects */ 1928 typedef struct { 1929 char *label; 1930 atomic_t *counter; 1931 } sctp_dbg_objcnt_entry_t; 1932 1933 #endif /* __sctp_structs_h__ */ 1934