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 int user_frag; 211 __u32 autoclose; 212 __u8 nodelay; 213 __u8 disable_fragments; 214 __u8 v4mapped; 215 __u8 frag_interleave; 216 __u32 adaptation_ind; 217 __u32 pd_point; 218 219 atomic_t pd_mode; 220 /* Receive to here while partial delivery is in effect. */ 221 struct sk_buff_head pd_lobby; 222 struct list_head auto_asconf_list; 223 int do_auto_asconf; 224 }; 225 226 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 227 { 228 return (struct sctp_sock *)sk; 229 } 230 231 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 232 { 233 return (struct sock *)sp; 234 } 235 236 #if IS_ENABLED(CONFIG_IPV6) 237 struct sctp6_sock { 238 struct sctp_sock sctp; 239 struct ipv6_pinfo inet6; 240 }; 241 #endif /* CONFIG_IPV6 */ 242 243 244 /* This is our APPLICATION-SPECIFIC state cookie. 245 * THIS IS NOT DICTATED BY THE SPECIFICATION. 246 */ 247 /* These are the parts of an association which we send in the cookie. 248 * Most of these are straight out of: 249 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 250 * 251 */ 252 253 struct sctp_cookie { 254 255 /* My : Tag expected in every inbound packet and sent 256 * Verification: in the INIT or INIT ACK chunk. 257 * Tag : 258 */ 259 __u32 my_vtag; 260 261 /* Peer's : Tag expected in every outbound packet except 262 * Verification: in the INIT chunk. 263 * Tag : 264 */ 265 __u32 peer_vtag; 266 267 /* The rest of these are not from the spec, but really need to 268 * be in the cookie. 269 */ 270 271 /* My Tie Tag : Assist in discovering a restarting association. */ 272 __u32 my_ttag; 273 274 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 275 __u32 peer_ttag; 276 277 /* When does this cookie expire? */ 278 ktime_t expiration; 279 280 /* Number of inbound/outbound streams which are set 281 * and negotiated during the INIT process. 282 */ 283 __u16 sinit_num_ostreams; 284 __u16 sinit_max_instreams; 285 286 /* This is the first sequence number I used. */ 287 __u32 initial_tsn; 288 289 /* This holds the originating address of the INIT packet. */ 290 union sctp_addr peer_addr; 291 292 /* IG Section 2.35.3 293 * Include the source port of the INIT-ACK 294 */ 295 __u16 my_port; 296 297 __u8 prsctp_capable; 298 299 /* Padding for future use */ 300 __u8 padding; 301 302 __u32 adaptation_ind; 303 304 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 305 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 306 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 307 308 /* This is a shim for my peer's INIT packet, followed by 309 * a copy of the raw address list of the association. 310 * The length of the raw address list is saved in the 311 * raw_addr_list_len field, which will be used at the time when 312 * the association TCB is re-constructed from the cookie. 313 */ 314 __u32 raw_addr_list_len; 315 struct sctp_init_chunk peer_init[0]; 316 }; 317 318 319 /* The format of our cookie that we send to our peer. */ 320 struct sctp_signed_cookie { 321 __u8 signature[SCTP_SECRET_SIZE]; 322 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 323 struct sctp_cookie c; 324 } __packed; 325 326 /* This is another convenience type to allocate memory for address 327 * params for the maximum size and pass such structures around 328 * internally. 329 */ 330 union sctp_addr_param { 331 struct sctp_paramhdr p; 332 struct sctp_ipv4addr_param v4; 333 struct sctp_ipv6addr_param v6; 334 }; 335 336 /* A convenience type to allow walking through the various 337 * parameters and avoid casting all over the place. 338 */ 339 union sctp_params { 340 void *v; 341 struct sctp_paramhdr *p; 342 struct sctp_cookie_preserve_param *life; 343 struct sctp_hostname_param *dns; 344 struct sctp_cookie_param *cookie; 345 struct sctp_supported_addrs_param *sat; 346 struct sctp_ipv4addr_param *v4; 347 struct sctp_ipv6addr_param *v6; 348 union sctp_addr_param *addr; 349 struct sctp_adaptation_ind_param *aind; 350 struct sctp_supported_ext_param *ext; 351 struct sctp_random_param *random; 352 struct sctp_chunks_param *chunks; 353 struct sctp_hmac_algo_param *hmac_algo; 354 struct sctp_addip_param *addip; 355 }; 356 357 /* RFC 2960. Section 3.3.5 Heartbeat. 358 * Heartbeat Information: variable length 359 * The Sender-specific Heartbeat Info field should normally include 360 * information about the sender's current time when this HEARTBEAT 361 * chunk is sent and the destination transport address to which this 362 * HEARTBEAT is sent (see Section 8.3). 363 */ 364 typedef struct sctp_sender_hb_info { 365 struct sctp_paramhdr param_hdr; 366 union sctp_addr daddr; 367 unsigned long sent_at; 368 __u64 hb_nonce; 369 } __packed sctp_sender_hb_info_t; 370 371 /* 372 * RFC 2960 1.3.2 Sequenced Delivery within Streams 373 * 374 * The term "stream" is used in SCTP to refer to a sequence of user 375 * messages that are to be delivered to the upper-layer protocol in 376 * order with respect to other messages within the same stream. This is 377 * in contrast to its usage in TCP, where it refers to a sequence of 378 * bytes (in this document a byte is assumed to be eight bits). 379 * ... 380 * 381 * This is the structure we use to track both our outbound and inbound 382 * SSN, or Stream Sequence Numbers. 383 */ 384 385 struct sctp_stream { 386 __u16 *ssn; 387 unsigned int len; 388 }; 389 390 struct sctp_ssnmap { 391 struct sctp_stream in; 392 struct sctp_stream out; 393 }; 394 395 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 396 gfp_t gfp); 397 void sctp_ssnmap_free(struct sctp_ssnmap *map); 398 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 399 400 /* What is the current SSN number for this stream? */ 401 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 402 { 403 return stream->ssn[id]; 404 } 405 406 /* Return the next SSN number for this stream. */ 407 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 408 { 409 return stream->ssn[id]++; 410 } 411 412 /* Skip over this ssn and all below. */ 413 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 414 __u16 ssn) 415 { 416 stream->ssn[id] = ssn+1; 417 } 418 419 /* 420 * Pointers to address related SCTP functions. 421 * (i.e. things that depend on the address family.) 422 */ 423 struct sctp_af { 424 int (*sctp_xmit) (struct sk_buff *skb, 425 struct sctp_transport *); 426 int (*setsockopt) (struct sock *sk, 427 int level, 428 int optname, 429 char __user *optval, 430 unsigned int optlen); 431 int (*getsockopt) (struct sock *sk, 432 int level, 433 int optname, 434 char __user *optval, 435 int __user *optlen); 436 int (*compat_setsockopt) (struct sock *sk, 437 int level, 438 int optname, 439 char __user *optval, 440 unsigned int optlen); 441 int (*compat_getsockopt) (struct sock *sk, 442 int level, 443 int optname, 444 char __user *optval, 445 int __user *optlen); 446 void (*get_dst) (struct sctp_transport *t, 447 union sctp_addr *saddr, 448 struct flowi *fl, 449 struct sock *sk); 450 void (*get_saddr) (struct sctp_sock *sk, 451 struct sctp_transport *t, 452 struct flowi *fl); 453 void (*copy_addrlist) (struct list_head *, 454 struct net_device *); 455 int (*cmp_addr) (const union sctp_addr *addr1, 456 const union sctp_addr *addr2); 457 void (*addr_copy) (union sctp_addr *dst, 458 union sctp_addr *src); 459 void (*from_skb) (union sctp_addr *, 460 struct sk_buff *skb, 461 int saddr); 462 void (*from_sk) (union sctp_addr *, 463 struct sock *sk); 464 void (*to_sk_saddr) (union sctp_addr *, 465 struct sock *sk); 466 void (*to_sk_daddr) (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 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 509 struct sctp_af *af; 510 }; 511 512 513 /* Structure to track chunk fragments that have been acked, but peer 514 * fragments of the same message have not. 515 */ 516 struct sctp_datamsg { 517 /* Chunks waiting to be submitted to lower layer. */ 518 struct list_head chunks; 519 /* Reference counting. */ 520 atomic_t refcnt; 521 /* When is this message no longer interesting to the peer? */ 522 unsigned long expires_at; 523 /* Did the messenge fail to send? */ 524 int send_error; 525 u8 send_failed:1, 526 can_abandon:1, /* can chunks from this message can be abandoned. */ 527 can_delay; /* should this message be Nagle delayed */ 528 }; 529 530 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 531 struct sctp_sndrcvinfo *, 532 struct msghdr *, int len); 533 void sctp_datamsg_free(struct sctp_datamsg *); 534 void sctp_datamsg_put(struct sctp_datamsg *); 535 void sctp_chunk_fail(struct sctp_chunk *, int error); 536 int sctp_chunk_abandoned(struct sctp_chunk *); 537 538 /* RFC2960 1.4 Key Terms 539 * 540 * o Chunk: A unit of information within an SCTP packet, consisting of 541 * a chunk header and chunk-specific content. 542 * 543 * As a matter of convenience, we remember the SCTP common header for 544 * each chunk as well as a few other header pointers... 545 */ 546 struct sctp_chunk { 547 struct list_head list; 548 549 atomic_t refcnt; 550 551 /* This is our link to the per-transport transmitted list. */ 552 struct list_head transmitted_list; 553 554 /* This field is used by chunks that hold fragmented data. 555 * For the first fragment this is the list that holds the rest of 556 * fragments. For the remaining fragments, this is the link to the 557 * frag_list maintained in the first fragment. 558 */ 559 struct list_head frag_list; 560 561 /* This points to the sk_buff containing the actual data. */ 562 struct sk_buff *skb; 563 564 /* These are the SCTP headers by reverse order in a packet. 565 * Note that some of these may happen more than once. In that 566 * case, we point at the "current" one, whatever that means 567 * for that level of header. 568 */ 569 570 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 571 union sctp_params param_hdr; 572 union { 573 __u8 *v; 574 struct sctp_datahdr *data_hdr; 575 struct sctp_inithdr *init_hdr; 576 struct sctp_sackhdr *sack_hdr; 577 struct sctp_heartbeathdr *hb_hdr; 578 struct sctp_sender_hb_info *hbs_hdr; 579 struct sctp_shutdownhdr *shutdown_hdr; 580 struct sctp_signed_cookie *cookie_hdr; 581 struct sctp_ecnehdr *ecne_hdr; 582 struct sctp_cwrhdr *ecn_cwr_hdr; 583 struct sctp_errhdr *err_hdr; 584 struct sctp_addiphdr *addip_hdr; 585 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 586 struct sctp_authhdr *auth_hdr; 587 } subh; 588 589 __u8 *chunk_end; 590 591 struct sctp_chunkhdr *chunk_hdr; 592 struct sctphdr *sctp_hdr; 593 594 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 595 struct sctp_sndrcvinfo sinfo; 596 597 /* Which association does this belong to? */ 598 struct sctp_association *asoc; 599 600 /* What endpoint received this chunk? */ 601 struct sctp_ep_common *rcvr; 602 603 /* We fill this in if we are calculating RTT. */ 604 unsigned long sent_at; 605 606 /* What is the origin IP address for this chunk? */ 607 union sctp_addr source; 608 /* Destination address for this chunk. */ 609 union sctp_addr dest; 610 611 /* For outbound message, track all fragments for SEND_FAILED. */ 612 struct sctp_datamsg *msg; 613 614 /* For an inbound chunk, this tells us where it came from. 615 * For an outbound chunk, it tells us where we'd like it to 616 * go. It is NULL if we have no preference. 617 */ 618 struct sctp_transport *transport; 619 620 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 621 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 622 * spec violates the principle premis that all chunks are processed 623 * in order. 624 */ 625 struct sk_buff *auth_chunk; 626 627 #define SCTP_CAN_FRTX 0x0 628 #define SCTP_NEED_FRTX 0x1 629 #define SCTP_DONT_FRTX 0x2 630 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 631 resent:1, /* Has this chunk ever been resent. */ 632 has_tsn:1, /* Does this chunk have a TSN yet? */ 633 has_ssn:1, /* Does this chunk have a SSN yet? */ 634 singleton:1, /* Only chunk in the packet? */ 635 end_of_packet:1, /* Last chunk in the packet? */ 636 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 637 pdiscard:1, /* Discard the whole packet now? */ 638 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 639 data_accepted:1, /* At least 1 chunk accepted */ 640 auth:1, /* IN: was auth'ed | OUT: needs auth */ 641 has_asconf:1, /* IN: have seen an asconf before */ 642 tsn_missing_report:2, /* Data chunk missing counter. */ 643 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 644 }; 645 646 void sctp_chunk_hold(struct sctp_chunk *); 647 void sctp_chunk_put(struct sctp_chunk *); 648 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 649 struct iovec *data); 650 void sctp_chunk_free(struct sctp_chunk *); 651 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 652 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 653 const struct sctp_association *, 654 struct sock *); 655 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 656 union sctp_addr *); 657 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 658 659 enum { 660 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 661 SCTP_ADDR_SRC, /* address can be used as source */ 662 SCTP_ADDR_DEL, /* address about to be deleted */ 663 }; 664 665 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 666 struct sctp_sockaddr_entry { 667 struct list_head list; 668 struct rcu_head rcu; 669 union sctp_addr a; 670 __u8 state; 671 __u8 valid; 672 }; 673 674 #define SCTP_ADDRESS_TICK_DELAY 500 675 676 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 677 678 /* This structure holds lists of chunks as we are assembling for 679 * transmission. 680 */ 681 struct sctp_packet { 682 /* These are the SCTP header values (host order) for the packet. */ 683 __u16 source_port; 684 __u16 destination_port; 685 __u32 vtag; 686 687 /* This contains the payload chunks. */ 688 struct list_head chunk_list; 689 690 /* This is the overhead of the sctp and ip headers. */ 691 size_t overhead; 692 /* This is the total size of all chunks INCLUDING padding. */ 693 size_t size; 694 695 /* The packet is destined for this transport address. 696 * The function we finally use to pass down to the next lower 697 * layer lives in the transport structure. 698 */ 699 struct sctp_transport *transport; 700 701 /* pointer to the auth chunk for this packet */ 702 struct sctp_chunk *auth; 703 704 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 705 has_sack:1, /* This packet contains a SACK chunk. */ 706 has_auth:1, /* This packet contains an AUTH chunk */ 707 has_data:1, /* This packet contains at least 1 DATA chunk */ 708 ipfragok:1; /* So let ip fragment this packet */ 709 }; 710 711 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 712 struct sctp_transport *, 713 __u16 sport, __u16 dport); 714 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 715 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 716 struct sctp_chunk *, int); 717 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 718 struct sctp_chunk *); 719 int sctp_packet_transmit(struct sctp_packet *); 720 void sctp_packet_free(struct sctp_packet *); 721 722 static inline int sctp_packet_empty(struct sctp_packet *packet) 723 { 724 return packet->size == packet->overhead; 725 } 726 727 /* This represents a remote transport address. 728 * For local transport addresses, we just use union sctp_addr. 729 * 730 * RFC2960 Section 1.4 Key Terms 731 * 732 * o Transport address: A Transport Address is traditionally defined 733 * by Network Layer address, Transport Layer protocol and Transport 734 * Layer port number. In the case of SCTP running over IP, a 735 * transport address is defined by the combination of an IP address 736 * and an SCTP port number (where SCTP is the Transport protocol). 737 * 738 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 739 * 740 * o The sender keeps a separate congestion control parameter set for 741 * each of the destination addresses it can send to (not each 742 * source-destination pair but for each destination). The parameters 743 * should decay if the address is not used for a long enough time 744 * period. 745 * 746 */ 747 struct sctp_transport { 748 /* A list of transports. */ 749 struct list_head transports; 750 751 /* Reference counting. */ 752 atomic_t refcnt; 753 __u32 dead:1, 754 /* RTO-Pending : A flag used to track if one of the DATA 755 * chunks sent to this address is currently being 756 * used to compute a RTT. If this flag is 0, 757 * the next DATA chunk sent to this destination 758 * should be used to compute a RTT and this flag 759 * should be set. Every time the RTT 760 * calculation completes (i.e. the DATA chunk 761 * is SACK'd) clear this flag. 762 */ 763 rto_pending:1, 764 765 /* 766 * hb_sent : a flag that signals that we have a pending 767 * heartbeat. 768 */ 769 hb_sent:1, 770 771 /* Is the Path MTU update pending on this tranport */ 772 pmtu_pending:1; 773 774 /* Has this transport moved the ctsn since we last sacked */ 775 __u32 sack_generation; 776 u32 dst_cookie; 777 778 struct flowi fl; 779 780 /* This is the peer's IP address and port. */ 781 union sctp_addr ipaddr; 782 783 /* These are the functions we call to handle LLP stuff. */ 784 struct sctp_af *af_specific; 785 786 /* Which association do we belong to? */ 787 struct sctp_association *asoc; 788 789 /* RFC2960 790 * 791 * 12.3 Per Transport Address Data 792 * 793 * For each destination transport address in the peer's 794 * address list derived from the INIT or INIT ACK chunk, a 795 * number of data elements needs to be maintained including: 796 */ 797 /* RTO : The current retransmission timeout value. */ 798 unsigned long rto; 799 800 __u32 rtt; /* This is the most recent RTT. */ 801 802 /* RTTVAR : The current RTT variation. */ 803 __u32 rttvar; 804 805 /* SRTT : The current smoothed round trip time. */ 806 __u32 srtt; 807 808 /* 809 * These are the congestion stats. 810 */ 811 /* cwnd : The current congestion window. */ 812 __u32 cwnd; /* This is the actual cwnd. */ 813 814 /* ssthresh : The current slow start threshold value. */ 815 __u32 ssthresh; 816 817 /* partial : The tracking method for increase of cwnd when in 818 * bytes acked : congestion avoidance mode (see Section 6.2.2) 819 */ 820 __u32 partial_bytes_acked; 821 822 /* Data that has been sent, but not acknowledged. */ 823 __u32 flight_size; 824 825 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 826 827 /* Destination */ 828 struct dst_entry *dst; 829 /* Source address. */ 830 union sctp_addr saddr; 831 832 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 833 * the destination address every heartbeat interval. 834 */ 835 unsigned long hbinterval; 836 837 /* SACK delay timeout */ 838 unsigned long sackdelay; 839 __u32 sackfreq; 840 841 /* When was the last time that we heard from this transport? We use 842 * this to pick new active and retran paths. 843 */ 844 ktime_t last_time_heard; 845 846 /* Last time(in jiffies) when cwnd is reduced due to the congestion 847 * indication based on ECNE chunk. 848 */ 849 unsigned long last_time_ecne_reduced; 850 851 /* This is the max_retrans value for the transport and will 852 * be initialized from the assocs value. This can be changed 853 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 854 */ 855 __u16 pathmaxrxt; 856 857 /* This is the partially failed retrans value for the transport 858 * and will be initialized from the assocs value. This can be changed 859 * using the SCTP_PEER_ADDR_THLDS socket option 860 */ 861 int pf_retrans; 862 /* PMTU : The current known path MTU. */ 863 __u32 pathmtu; 864 865 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 866 __u32 param_flags; 867 868 /* The number of times INIT has been sent on this transport. */ 869 int init_sent_count; 870 871 /* state : The current state of this destination, 872 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 873 */ 874 int state; 875 876 /* These are the error stats for this destination. */ 877 878 /* Error count : The current error count for this destination. */ 879 unsigned short error_count; 880 881 /* Per : A timer used by each destination. 882 * Destination : 883 * Timer : 884 * 885 * [Everywhere else in the text this is called T3-rtx. -ed] 886 */ 887 struct timer_list T3_rtx_timer; 888 889 /* Heartbeat timer is per destination. */ 890 struct timer_list hb_timer; 891 892 /* Timer to handle ICMP proto unreachable envets */ 893 struct timer_list proto_unreach_timer; 894 895 /* Since we're using per-destination retransmission timers 896 * (see above), we're also using per-destination "transmitted" 897 * queues. This probably ought to be a private struct 898 * accessible only within the outqueue, but it's not, yet. 899 */ 900 struct list_head transmitted; 901 902 /* We build bundle-able packets for this transport here. */ 903 struct sctp_packet packet; 904 905 /* This is the list of transports that have chunks to send. */ 906 struct list_head send_ready; 907 908 /* State information saved for SFR_CACC algorithm. The key 909 * idea in SFR_CACC is to maintain state at the sender on a 910 * per-destination basis when a changeover happens. 911 * char changeover_active; 912 * char cycling_changeover; 913 * __u32 next_tsn_at_change; 914 * char cacc_saw_newack; 915 */ 916 struct { 917 /* An unsigned integer, which stores the next TSN to be 918 * used by the sender, at the moment of changeover. 919 */ 920 __u32 next_tsn_at_change; 921 922 /* A flag which indicates the occurrence of a changeover */ 923 char changeover_active; 924 925 /* A flag which indicates whether the change of primary is 926 * the first switch to this destination address during an 927 * active switch. 928 */ 929 char cycling_changeover; 930 931 /* A temporary flag, which is used during the processing of 932 * a SACK to estimate the causative TSN(s)'s group. 933 */ 934 char cacc_saw_newack; 935 } cacc; 936 937 /* 64-bit random number sent with heartbeat. */ 938 __u64 hb_nonce; 939 940 struct rcu_head rcu; 941 }; 942 943 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 944 gfp_t); 945 void sctp_transport_set_owner(struct sctp_transport *, 946 struct sctp_association *); 947 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 948 struct sctp_sock *); 949 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 950 void sctp_transport_free(struct sctp_transport *); 951 void sctp_transport_reset_timers(struct sctp_transport *); 952 void sctp_transport_hold(struct sctp_transport *); 953 void sctp_transport_put(struct sctp_transport *); 954 void sctp_transport_update_rto(struct sctp_transport *, __u32); 955 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 956 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 957 void sctp_transport_burst_limited(struct sctp_transport *); 958 void sctp_transport_burst_reset(struct sctp_transport *); 959 unsigned long sctp_transport_timeout(struct sctp_transport *); 960 void sctp_transport_reset(struct sctp_transport *); 961 void sctp_transport_update_pmtu(struct sock *, struct sctp_transport *, u32); 962 void sctp_transport_immediate_rtx(struct sctp_transport *); 963 964 965 /* This is the structure we use to queue packets as they come into 966 * SCTP. We write packets to it and read chunks from it. 967 */ 968 struct sctp_inq { 969 /* This is actually a queue of sctp_chunk each 970 * containing a partially decoded packet. 971 */ 972 struct list_head in_chunk_list; 973 /* This is the packet which is currently off the in queue and is 974 * being worked on through the inbound chunk processing. 975 */ 976 struct sctp_chunk *in_progress; 977 978 /* This is the delayed task to finish delivering inbound 979 * messages. 980 */ 981 struct work_struct immediate; 982 }; 983 984 void sctp_inq_init(struct sctp_inq *); 985 void sctp_inq_free(struct sctp_inq *); 986 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 987 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 988 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 989 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 990 991 /* This is the structure we use to hold outbound chunks. You push 992 * chunks in and they automatically pop out the other end as bundled 993 * packets (it calls (*output_handler)()). 994 * 995 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 996 * and 8.2 of the v13 draft. 997 * 998 * It handles retransmissions. The connection to the timeout portion 999 * of the state machine is through sctp_..._timeout() and timeout_handler. 1000 * 1001 * If you feed it SACKs, it will eat them. 1002 * 1003 * If you give it big chunks, it will fragment them. 1004 * 1005 * It assigns TSN's to data chunks. This happens at the last possible 1006 * instant before transmission. 1007 * 1008 * When free()'d, it empties itself out via output_handler(). 1009 */ 1010 struct sctp_outq { 1011 struct sctp_association *asoc; 1012 1013 /* Data pending that has never been transmitted. */ 1014 struct list_head out_chunk_list; 1015 1016 unsigned int out_qlen; /* Total length of queued data chunks. */ 1017 1018 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1019 unsigned int error; 1020 1021 /* These are control chunks we want to send. */ 1022 struct list_head control_chunk_list; 1023 1024 /* These are chunks that have been sacked but are above the 1025 * CTSN, or cumulative tsn ack point. 1026 */ 1027 struct list_head sacked; 1028 1029 /* Put chunks on this list to schedule them for 1030 * retransmission. 1031 */ 1032 struct list_head retransmit; 1033 1034 /* Put chunks on this list to save them for FWD TSN processing as 1035 * they were abandoned. 1036 */ 1037 struct list_head abandoned; 1038 1039 /* How many unackd bytes do we have in-flight? */ 1040 __u32 outstanding_bytes; 1041 1042 /* Are we doing fast-rtx on this queue */ 1043 char fast_rtx; 1044 1045 /* Corked? */ 1046 char cork; 1047 }; 1048 1049 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1050 void sctp_outq_teardown(struct sctp_outq *); 1051 void sctp_outq_free(struct sctp_outq*); 1052 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1053 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1054 int sctp_outq_is_empty(const struct sctp_outq *); 1055 void sctp_outq_restart(struct sctp_outq *); 1056 1057 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1058 sctp_retransmit_reason_t); 1059 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1060 int sctp_outq_uncork(struct sctp_outq *); 1061 /* Uncork and flush an outqueue. */ 1062 static inline void sctp_outq_cork(struct sctp_outq *q) 1063 { 1064 q->cork = 1; 1065 } 1066 1067 /* These bind address data fields common between endpoints and associations */ 1068 struct sctp_bind_addr { 1069 1070 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1071 * 1072 * SCTP Port: The local SCTP port number the endpoint is 1073 * bound to. 1074 */ 1075 __u16 port; 1076 1077 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1078 * 1079 * Address List: The list of IP addresses that this instance 1080 * has bound. This information is passed to one's 1081 * peer(s) in INIT and INIT ACK chunks. 1082 */ 1083 struct list_head address_list; 1084 }; 1085 1086 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1087 void sctp_bind_addr_free(struct sctp_bind_addr *); 1088 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1089 const struct sctp_bind_addr *src, 1090 sctp_scope_t scope, gfp_t gfp, 1091 int flags); 1092 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1093 const struct sctp_bind_addr *src, 1094 gfp_t gfp); 1095 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1096 __u8 addr_state, gfp_t gfp); 1097 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1098 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1099 struct sctp_sock *); 1100 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1101 struct sctp_sock *, struct sctp_sock *); 1102 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1103 const union sctp_addr *addr); 1104 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1105 const union sctp_addr *addrs, 1106 int addrcnt, 1107 struct sctp_sock *opt); 1108 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1109 int *addrs_len, 1110 gfp_t gfp); 1111 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1112 __u16 port, gfp_t gfp); 1113 1114 sctp_scope_t sctp_scope(const union sctp_addr *); 1115 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1116 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1117 int sctp_addr_is_valid(const union sctp_addr *addr); 1118 int sctp_is_ep_boundall(struct sock *sk); 1119 1120 1121 /* What type of endpoint? */ 1122 typedef enum { 1123 SCTP_EP_TYPE_SOCKET, 1124 SCTP_EP_TYPE_ASSOCIATION, 1125 } sctp_endpoint_type_t; 1126 1127 /* 1128 * A common base class to bridge the implmentation view of a 1129 * socket (usually listening) endpoint versus an association's 1130 * local endpoint. 1131 * This common structure is useful for several purposes: 1132 * 1) Common interface for lookup routines. 1133 * a) Subfunctions work for either endpoint or association 1134 * b) Single interface to lookup allows hiding the lookup lock rather 1135 * than acquiring it externally. 1136 * 2) Common interface for the inbound chunk handling/state machine. 1137 * 3) Common object handling routines for reference counting, etc. 1138 * 4) Disentangle association lookup from endpoint lookup, where we 1139 * do not have to find our endpoint to find our association. 1140 * 1141 */ 1142 1143 struct sctp_ep_common { 1144 /* Fields to help us manage our entries in the hash tables. */ 1145 struct hlist_node node; 1146 int hashent; 1147 1148 /* Runtime type information. What kind of endpoint is this? */ 1149 sctp_endpoint_type_t type; 1150 1151 /* Some fields to help us manage this object. 1152 * refcnt - Reference count access to this object. 1153 * dead - Do not attempt to use this object. 1154 */ 1155 atomic_t refcnt; 1156 bool dead; 1157 1158 /* What socket does this endpoint belong to? */ 1159 struct sock *sk; 1160 1161 /* This is where we receive inbound chunks. */ 1162 struct sctp_inq inqueue; 1163 1164 /* This substructure includes the defining parameters of the 1165 * endpoint: 1166 * bind_addr.port is our shared port number. 1167 * bind_addr.address_list is our set of local IP addresses. 1168 */ 1169 struct sctp_bind_addr bind_addr; 1170 }; 1171 1172 1173 /* RFC Section 1.4 Key Terms 1174 * 1175 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1176 * multi-homed host, an SCTP endpoint is represented to its peers as a 1177 * combination of a set of eligible destination transport addresses to 1178 * which SCTP packets can be sent and a set of eligible source 1179 * transport addresses from which SCTP packets can be received. 1180 * All transport addresses used by an SCTP endpoint must use the 1181 * same port number, but can use multiple IP addresses. A transport 1182 * address used by an SCTP endpoint must not be used by another 1183 * SCTP endpoint. In other words, a transport address is unique 1184 * to an SCTP endpoint. 1185 * 1186 * From an implementation perspective, each socket has one of these. 1187 * A TCP-style socket will have exactly one association on one of 1188 * these. An UDP-style socket will have multiple associations hanging 1189 * off one of these. 1190 */ 1191 1192 struct sctp_endpoint { 1193 /* Common substructure for endpoint and association. */ 1194 struct sctp_ep_common base; 1195 1196 /* Associations: A list of current associations and mappings 1197 * to the data consumers for each association. This 1198 * may be in the form of a hash table or other 1199 * implementation dependent structure. The data 1200 * consumers may be process identification 1201 * information such as file descriptors, named pipe 1202 * pointer, or table pointers dependent on how SCTP 1203 * is implemented. 1204 */ 1205 /* This is really a list of struct sctp_association entries. */ 1206 struct list_head asocs; 1207 1208 /* Secret Key: A secret key used by this endpoint to compute 1209 * the MAC. This SHOULD be a cryptographic quality 1210 * random number with a sufficient length. 1211 * Discussion in [RFC1750] can be helpful in 1212 * selection of the key. 1213 */ 1214 __u8 secret_key[SCTP_SECRET_SIZE]; 1215 1216 /* digest: This is a digest of the sctp cookie. This field is 1217 * only used on the receive path when we try to validate 1218 * that the cookie has not been tampered with. We put 1219 * this here so we pre-allocate this once and can re-use 1220 * on every receive. 1221 */ 1222 __u8 *digest; 1223 1224 /* sendbuf acct. policy. */ 1225 __u32 sndbuf_policy; 1226 1227 /* rcvbuf acct. policy. */ 1228 __u32 rcvbuf_policy; 1229 1230 /* SCTP AUTH: array of the HMACs that will be allocated 1231 * we need this per association so that we don't serialize 1232 */ 1233 struct crypto_hash **auth_hmacs; 1234 1235 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1236 struct sctp_hmac_algo_param *auth_hmacs_list; 1237 1238 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1239 struct sctp_chunks_param *auth_chunk_list; 1240 1241 /* SCTP-AUTH: endpoint shared keys */ 1242 struct list_head endpoint_shared_keys; 1243 __u16 active_key_id; 1244 __u8 auth_enable; 1245 }; 1246 1247 /* Recover the outter endpoint structure. */ 1248 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1249 { 1250 struct sctp_endpoint *ep; 1251 1252 ep = container_of(base, struct sctp_endpoint, base); 1253 return ep; 1254 } 1255 1256 /* These are function signatures for manipulating endpoints. */ 1257 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1258 void sctp_endpoint_free(struct sctp_endpoint *); 1259 void sctp_endpoint_put(struct sctp_endpoint *); 1260 void sctp_endpoint_hold(struct sctp_endpoint *); 1261 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1262 struct sctp_association *sctp_endpoint_lookup_assoc( 1263 const struct sctp_endpoint *ep, 1264 const union sctp_addr *paddr, 1265 struct sctp_transport **); 1266 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1267 const union sctp_addr *); 1268 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1269 struct net *, const union sctp_addr *); 1270 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1271 const union sctp_addr *paddr); 1272 1273 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1274 const struct sctp_association *asoc, 1275 sctp_cid_t, sctp_init_chunk_t *peer_init, 1276 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1277 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1278 const union sctp_addr *peer, 1279 sctp_init_chunk_t *init, gfp_t gfp); 1280 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1281 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1282 1283 struct sctp_inithdr_host { 1284 __u32 init_tag; 1285 __u32 a_rwnd; 1286 __u16 num_outbound_streams; 1287 __u16 num_inbound_streams; 1288 __u32 initial_tsn; 1289 }; 1290 1291 /* SCTP_GET_ASSOC_STATS counters */ 1292 struct sctp_priv_assoc_stats { 1293 /* Maximum observed rto in the association during subsequent 1294 * observations. Value is set to 0 if no RTO measurement took place 1295 * The transport where the max_rto was observed is returned in 1296 * obs_rto_ipaddr 1297 */ 1298 struct sockaddr_storage obs_rto_ipaddr; 1299 __u64 max_obs_rto; 1300 /* Total In and Out SACKs received and sent */ 1301 __u64 isacks; 1302 __u64 osacks; 1303 /* Total In and Out packets received and sent */ 1304 __u64 opackets; 1305 __u64 ipackets; 1306 /* Total retransmitted chunks */ 1307 __u64 rtxchunks; 1308 /* TSN received > next expected */ 1309 __u64 outofseqtsns; 1310 /* Duplicate Chunks received */ 1311 __u64 idupchunks; 1312 /* Gap Ack Blocks received */ 1313 __u64 gapcnt; 1314 /* Unordered data chunks sent and received */ 1315 __u64 ouodchunks; 1316 __u64 iuodchunks; 1317 /* Ordered data chunks sent and received */ 1318 __u64 oodchunks; 1319 __u64 iodchunks; 1320 /* Control chunks sent and received */ 1321 __u64 octrlchunks; 1322 __u64 ictrlchunks; 1323 }; 1324 1325 /* RFC2960 1326 * 1327 * 12. Recommended Transmission Control Block (TCB) Parameters 1328 * 1329 * This section details a recommended set of parameters that should 1330 * be contained within the TCB for an implementation. This section is 1331 * for illustrative purposes and should not be deemed as requirements 1332 * on an implementation or as an exhaustive list of all parameters 1333 * inside an SCTP TCB. Each implementation may need its own additional 1334 * parameters for optimization. 1335 */ 1336 1337 1338 /* Here we have information about each individual association. */ 1339 struct sctp_association { 1340 1341 /* A base structure common to endpoint and association. 1342 * In this context, it represents the associations's view 1343 * of the local endpoint of the association. 1344 */ 1345 struct sctp_ep_common base; 1346 1347 /* Associations on the same socket. */ 1348 struct list_head asocs; 1349 1350 /* association id. */ 1351 sctp_assoc_t assoc_id; 1352 1353 /* This is our parent endpoint. */ 1354 struct sctp_endpoint *ep; 1355 1356 /* These are those association elements needed in the cookie. */ 1357 struct sctp_cookie c; 1358 1359 /* This is all information about our peer. */ 1360 struct { 1361 /* transport_addr_list 1362 * 1363 * Peer : A list of SCTP transport addresses that the 1364 * Transport : peer is bound to. This information is derived 1365 * Address : from the INIT or INIT ACK and is used to 1366 * List : associate an inbound packet with a given 1367 * : association. Normally this information is 1368 * : hashed or keyed for quick lookup and access 1369 * : of the TCB. 1370 * : The list is also initialized with the list 1371 * : of addresses passed with the sctp_connectx() 1372 * : call. 1373 * 1374 * It is a list of SCTP_transport's. 1375 */ 1376 struct list_head transport_addr_list; 1377 1378 /* rwnd 1379 * 1380 * Peer Rwnd : Current calculated value of the peer's rwnd. 1381 */ 1382 __u32 rwnd; 1383 1384 /* transport_count 1385 * 1386 * Peer : A count of the number of peer addresses 1387 * Transport : in the Peer Transport Address List. 1388 * Address : 1389 * Count : 1390 */ 1391 __u16 transport_count; 1392 1393 /* port 1394 * The transport layer port number. 1395 */ 1396 __u16 port; 1397 1398 /* primary_path 1399 * 1400 * Primary : This is the current primary destination 1401 * Path : transport address of the peer endpoint. It 1402 * : may also specify a source transport address 1403 * : on this endpoint. 1404 * 1405 * All of these paths live on transport_addr_list. 1406 * 1407 * At the bakeoffs, we discovered that the intent of 1408 * primaryPath is that it only changes when the ULP 1409 * asks to have it changed. We add the activePath to 1410 * designate the connection we are currently using to 1411 * transmit new data and most control chunks. 1412 */ 1413 struct sctp_transport *primary_path; 1414 1415 /* Cache the primary path address here, when we 1416 * need a an address for msg_name. 1417 */ 1418 union sctp_addr primary_addr; 1419 1420 /* active_path 1421 * The path that we are currently using to 1422 * transmit new data and most control chunks. 1423 */ 1424 struct sctp_transport *active_path; 1425 1426 /* retran_path 1427 * 1428 * RFC2960 6.4 Multi-homed SCTP Endpoints 1429 * ... 1430 * Furthermore, when its peer is multi-homed, an 1431 * endpoint SHOULD try to retransmit a chunk to an 1432 * active destination transport address that is 1433 * different from the last destination address to 1434 * which the DATA chunk was sent. 1435 */ 1436 struct sctp_transport *retran_path; 1437 1438 /* Pointer to last transport I have sent on. */ 1439 struct sctp_transport *last_sent_to; 1440 1441 /* This is the last transport I have received DATA on. */ 1442 struct sctp_transport *last_data_from; 1443 1444 /* 1445 * Mapping An array of bits or bytes indicating which out of 1446 * Array order TSN's have been received (relative to the 1447 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1448 * order packets have been received, this array 1449 * will be set to all zero. This structure may be 1450 * in the form of a circular buffer or bit array. 1451 * 1452 * Last Rcvd : This is the last TSN received in 1453 * TSN : sequence. This value is set initially by 1454 * : taking the peer's Initial TSN, received in 1455 * : the INIT or INIT ACK chunk, and subtracting 1456 * : one from it. 1457 * 1458 * Throughout most of the specification this is called the 1459 * "Cumulative TSN ACK Point". In this case, we 1460 * ignore the advice in 12.2 in favour of the term 1461 * used in the bulk of the text. This value is hidden 1462 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1463 */ 1464 struct sctp_tsnmap tsn_map; 1465 1466 /* This mask is used to disable sending the ASCONF chunk 1467 * with specified parameter to peer. 1468 */ 1469 __be16 addip_disabled_mask; 1470 1471 /* These are capabilities which our peer advertised. */ 1472 __u8 ecn_capable:1, /* Can peer do ECN? */ 1473 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1474 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1475 hostname_address:1, /* Peer understands DNS addresses? */ 1476 asconf_capable:1, /* Does peer support ADDIP? */ 1477 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1478 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1479 1480 /* Ack State : This flag indicates if the next received 1481 * : packet is to be responded to with a 1482 * : SACK. This is initializedto 0. When a packet 1483 * : is received it is incremented. If this value 1484 * : reaches 2 or more, a SACK is sent and the 1485 * : value is reset to 0. Note: This is used only 1486 * : when no DATA chunks are received out of 1487 * : order. When DATA chunks are out of order, 1488 * : SACK's are not delayed (see Section 6). 1489 */ 1490 __u8 sack_needed; /* Do we need to sack the peer? */ 1491 __u32 sack_cnt; 1492 __u32 sack_generation; 1493 1494 __u32 adaptation_ind; /* Adaptation Code point. */ 1495 1496 struct sctp_inithdr_host i; 1497 void *cookie; 1498 int cookie_len; 1499 1500 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1501 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1502 * Initial TSN Value minus 1 1503 */ 1504 __u32 addip_serial; 1505 1506 /* SCTP-AUTH: We need to know pears random number, hmac list 1507 * and authenticated chunk list. All that is part of the 1508 * cookie and these are just pointers to those locations 1509 */ 1510 sctp_random_param_t *peer_random; 1511 sctp_chunks_param_t *peer_chunks; 1512 sctp_hmac_algo_param_t *peer_hmacs; 1513 } peer; 1514 1515 /* State : A state variable indicating what state the 1516 * : association is in, i.e. COOKIE-WAIT, 1517 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1518 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1519 * 1520 * Note: No "CLOSED" state is illustrated since if a 1521 * association is "CLOSED" its TCB SHOULD be removed. 1522 * 1523 * In this implementation we DO have a CLOSED 1524 * state which is used during initiation and shutdown. 1525 * 1526 * State takes values from SCTP_STATE_*. 1527 */ 1528 sctp_state_t state; 1529 1530 /* Overall : The overall association error count. 1531 * Error Count : [Clear this any time I get something.] 1532 */ 1533 int overall_error_count; 1534 1535 /* The cookie life I award for any cookie. */ 1536 ktime_t cookie_life; 1537 1538 /* These are the association's initial, max, and min RTO values. 1539 * These values will be initialized by system defaults, but can 1540 * be modified via the SCTP_RTOINFO socket option. 1541 */ 1542 unsigned long rto_initial; 1543 unsigned long rto_max; 1544 unsigned long rto_min; 1545 1546 /* Maximum number of new data packets that can be sent in a burst. */ 1547 int max_burst; 1548 1549 /* This is the max_retrans value for the association. This value will 1550 * be initialized initialized from system defaults, but can be 1551 * modified by the SCTP_ASSOCINFO socket option. 1552 */ 1553 int max_retrans; 1554 1555 /* This is the partially failed retrans value for the transport 1556 * and will be initialized from the assocs value. This can be 1557 * changed using the SCTP_PEER_ADDR_THLDS socket option 1558 */ 1559 int pf_retrans; 1560 1561 /* Maximum number of times the endpoint will retransmit INIT */ 1562 __u16 max_init_attempts; 1563 1564 /* How many times have we resent an INIT? */ 1565 __u16 init_retries; 1566 1567 /* The largest timeout or RTO value to use in attempting an INIT */ 1568 unsigned long max_init_timeo; 1569 1570 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1571 * the destination address every heartbeat interval. This value 1572 * will be inherited by all new transports. 1573 */ 1574 unsigned long hbinterval; 1575 1576 /* This is the max_retrans value for new transports in the 1577 * association. 1578 */ 1579 __u16 pathmaxrxt; 1580 1581 /* Flag that path mtu update is pending */ 1582 __u8 pmtu_pending; 1583 1584 /* Association : The smallest PMTU discovered for all of the 1585 * PMTU : peer's transport addresses. 1586 */ 1587 __u32 pathmtu; 1588 1589 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1590 __u32 param_flags; 1591 1592 __u32 sackfreq; 1593 /* SACK delay timeout */ 1594 unsigned long sackdelay; 1595 1596 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1597 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1598 1599 /* Transport to which SHUTDOWN chunk was last sent. */ 1600 struct sctp_transport *shutdown_last_sent_to; 1601 1602 /* Transport to which INIT chunk was last sent. */ 1603 struct sctp_transport *init_last_sent_to; 1604 1605 /* How many times have we resent a SHUTDOWN */ 1606 int shutdown_retries; 1607 1608 /* Next TSN : The next TSN number to be assigned to a new 1609 * : DATA chunk. This is sent in the INIT or INIT 1610 * : ACK chunk to the peer and incremented each 1611 * : time a DATA chunk is assigned a TSN 1612 * : (normally just prior to transmit or during 1613 * : fragmentation). 1614 */ 1615 __u32 next_tsn; 1616 1617 /* 1618 * Last Rcvd : This is the last TSN received in sequence. This value 1619 * TSN : is set initially by taking the peer's Initial TSN, 1620 * : received in the INIT or INIT ACK chunk, and 1621 * : subtracting one from it. 1622 * 1623 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1624 */ 1625 1626 __u32 ctsn_ack_point; 1627 1628 /* PR-SCTP Advanced.Peer.Ack.Point */ 1629 __u32 adv_peer_ack_point; 1630 1631 /* Highest TSN that is acknowledged by incoming SACKs. */ 1632 __u32 highest_sacked; 1633 1634 /* TSN marking the fast recovery exit point */ 1635 __u32 fast_recovery_exit; 1636 1637 /* Flag to track the current fast recovery state */ 1638 __u8 fast_recovery; 1639 1640 /* The number of unacknowledged data chunks. Reported through 1641 * the SCTP_STATUS sockopt. 1642 */ 1643 __u16 unack_data; 1644 1645 /* The total number of data chunks that we've had to retransmit 1646 * as the result of a T3 timer expiration 1647 */ 1648 __u32 rtx_data_chunks; 1649 1650 /* This is the association's receive buffer space. This value is used 1651 * to set a_rwnd field in an INIT or a SACK chunk. 1652 */ 1653 __u32 rwnd; 1654 1655 /* This is the last advertised value of rwnd over a SACK chunk. */ 1656 __u32 a_rwnd; 1657 1658 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1659 * to slop over a maximum of the association's frag_point. 1660 */ 1661 __u32 rwnd_over; 1662 1663 /* Keeps treack of rwnd pressure. This happens when we have 1664 * a window, but not recevie buffer (i.e small packets). This one 1665 * is releases slowly (1 PMTU at a time ). 1666 */ 1667 __u32 rwnd_press; 1668 1669 /* This is the sndbuf size in use for the association. 1670 * This corresponds to the sndbuf size for the association, 1671 * as specified in the sk->sndbuf. 1672 */ 1673 int sndbuf_used; 1674 1675 /* This is the amount of memory that this association has allocated 1676 * in the receive path at any given time. 1677 */ 1678 atomic_t rmem_alloc; 1679 1680 /* This is the wait queue head for send requests waiting on 1681 * the association sndbuf space. 1682 */ 1683 wait_queue_head_t wait; 1684 1685 /* The message size at which SCTP fragmentation will occur. */ 1686 __u32 frag_point; 1687 __u32 user_frag; 1688 1689 /* Counter used to count INIT errors. */ 1690 int init_err_counter; 1691 1692 /* Count the number of INIT cycles (for doubling timeout). */ 1693 int init_cycle; 1694 1695 /* Default send parameters. */ 1696 __u16 default_stream; 1697 __u16 default_flags; 1698 __u32 default_ppid; 1699 __u32 default_context; 1700 __u32 default_timetolive; 1701 1702 /* Default receive parameters */ 1703 __u32 default_rcv_context; 1704 1705 /* This tracks outbound ssn for a given stream. */ 1706 struct sctp_ssnmap *ssnmap; 1707 1708 /* All outbound chunks go through this structure. */ 1709 struct sctp_outq outqueue; 1710 1711 /* A smart pipe that will handle reordering and fragmentation, 1712 * as well as handle passing events up to the ULP. 1713 */ 1714 struct sctp_ulpq ulpq; 1715 1716 /* Last TSN that caused an ECNE Chunk to be sent. */ 1717 __u32 last_ecne_tsn; 1718 1719 /* Last TSN that caused a CWR Chunk to be sent. */ 1720 __u32 last_cwr_tsn; 1721 1722 /* How many duplicated TSNs have we seen? */ 1723 int numduptsns; 1724 1725 /* These are to support 1726 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1727 * and Enforcement of Flow and Message Limits" 1728 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1729 * or "ADDIP" for short. 1730 */ 1731 1732 1733 1734 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1735 * 1736 * R1) One and only one ASCONF Chunk MAY be in transit and 1737 * unacknowledged at any one time. If a sender, after sending 1738 * an ASCONF chunk, decides it needs to transfer another 1739 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1740 * returns from the previous ASCONF Chunk before sending a 1741 * subsequent ASCONF. Note this restriction binds each side, 1742 * so at any time two ASCONF may be in-transit on any given 1743 * association (one sent from each endpoint). 1744 * 1745 * [This is our one-and-only-one ASCONF in flight. If we do 1746 * not have an ASCONF in flight, this is NULL.] 1747 */ 1748 struct sctp_chunk *addip_last_asconf; 1749 1750 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1751 * 1752 * This is needed to implement itmes E1 - E4 of the updated 1753 * spec. Here is the justification: 1754 * 1755 * Since the peer may bundle multiple ASCONF chunks toward us, 1756 * we now need the ability to cache multiple ACKs. The section 1757 * describes in detail how they are cached and cleaned up. 1758 */ 1759 struct list_head asconf_ack_list; 1760 1761 /* These ASCONF chunks are waiting to be sent. 1762 * 1763 * These chunaks can't be pushed to outqueue until receiving 1764 * ASCONF_ACK for the previous ASCONF indicated by 1765 * addip_last_asconf, so as to guarantee that only one ASCONF 1766 * is in flight at any time. 1767 * 1768 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1769 * 1770 * In defining the ASCONF Chunk transfer procedures, it is 1771 * essential that these transfers MUST NOT cause congestion 1772 * within the network. To achieve this, we place these 1773 * restrictions on the transfer of ASCONF Chunks: 1774 * 1775 * R1) One and only one ASCONF Chunk MAY be in transit and 1776 * unacknowledged at any one time. If a sender, after sending 1777 * an ASCONF chunk, decides it needs to transfer another 1778 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1779 * returns from the previous ASCONF Chunk before sending a 1780 * subsequent ASCONF. Note this restriction binds each side, 1781 * so at any time two ASCONF may be in-transit on any given 1782 * association (one sent from each endpoint). 1783 * 1784 * 1785 * [I really think this is EXACTLY the sort of intelligence 1786 * which already resides in sctp_outq. Please move this 1787 * queue and its supporting logic down there. --piggy] 1788 */ 1789 struct list_head addip_chunk_list; 1790 1791 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1792 * 1793 * A2) A serial number should be assigned to the Chunk. The 1794 * serial number SHOULD be a monotonically increasing 1795 * number. The serial number SHOULD be initialized at 1796 * the start of the association to the same value as the 1797 * Initial TSN and every time a new ASCONF chunk is created 1798 * it is incremented by one after assigning the serial number 1799 * to the newly created chunk. 1800 * 1801 * ADDIP 1802 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1803 * 1804 * Serial Number : 32 bits (unsigned integer) 1805 * 1806 * This value represents a Serial Number for the ASCONF 1807 * Chunk. The valid range of Serial Number is from 0 to 1808 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1809 * after reaching 4294967295. 1810 */ 1811 __u32 addip_serial; 1812 int src_out_of_asoc_ok; 1813 union sctp_addr *asconf_addr_del_pending; 1814 struct sctp_transport *new_transport; 1815 1816 /* SCTP AUTH: list of the endpoint shared keys. These 1817 * keys are provided out of band by the user applicaton 1818 * and can't change during the lifetime of the association 1819 */ 1820 struct list_head endpoint_shared_keys; 1821 1822 /* SCTP AUTH: 1823 * The current generated assocaition shared key (secret) 1824 */ 1825 struct sctp_auth_bytes *asoc_shared_key; 1826 1827 /* SCTP AUTH: hmac id of the first peer requested algorithm 1828 * that we support. 1829 */ 1830 __u16 default_hmac_id; 1831 1832 __u16 active_key_id; 1833 1834 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1835 temp:1; /* Is it a temporary association? */ 1836 1837 struct sctp_priv_assoc_stats stats; 1838 }; 1839 1840 1841 /* An eyecatcher for determining if we are really looking at an 1842 * association data structure. 1843 */ 1844 enum { 1845 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1846 }; 1847 1848 /* Recover the outter association structure. */ 1849 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1850 { 1851 struct sctp_association *asoc; 1852 1853 asoc = container_of(base, struct sctp_association, base); 1854 return asoc; 1855 } 1856 1857 /* These are function signatures for manipulating associations. */ 1858 1859 1860 struct sctp_association * 1861 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1862 sctp_scope_t scope, gfp_t gfp); 1863 void sctp_association_free(struct sctp_association *); 1864 void sctp_association_put(struct sctp_association *); 1865 void sctp_association_hold(struct sctp_association *); 1866 1867 struct sctp_transport *sctp_assoc_choose_alter_transport( 1868 struct sctp_association *, struct sctp_transport *); 1869 void sctp_assoc_update_retran_path(struct sctp_association *); 1870 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1871 const union sctp_addr *); 1872 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1873 const union sctp_addr *laddr); 1874 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1875 const union sctp_addr *address, 1876 const gfp_t gfp, 1877 const int peer_state); 1878 void sctp_assoc_del_peer(struct sctp_association *asoc, 1879 const union sctp_addr *addr); 1880 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1881 struct sctp_transport *peer); 1882 void sctp_assoc_control_transport(struct sctp_association *, 1883 struct sctp_transport *, 1884 sctp_transport_cmd_t, sctp_sn_error_t); 1885 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1886 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1887 struct net *, 1888 const union sctp_addr *, 1889 const union sctp_addr *); 1890 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1891 void sctp_assoc_update(struct sctp_association *old, 1892 struct sctp_association *new); 1893 1894 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1895 1896 void sctp_assoc_sync_pmtu(struct sock *, struct sctp_association *); 1897 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1898 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1899 void sctp_assoc_set_primary(struct sctp_association *, 1900 struct sctp_transport *); 1901 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1902 struct sctp_transport *); 1903 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1904 sctp_scope_t, gfp_t); 1905 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1906 struct sctp_cookie*, 1907 gfp_t gfp); 1908 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1909 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1910 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1911 const struct sctp_association *asoc, 1912 __be32 serial); 1913 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1914 1915 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1916 const union sctp_addr *ss2); 1917 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1918 1919 /* A convenience structure to parse out SCTP specific CMSGs. */ 1920 typedef struct sctp_cmsgs { 1921 struct sctp_initmsg *init; 1922 struct sctp_sndrcvinfo *info; 1923 } sctp_cmsgs_t; 1924 1925 /* Structure for tracking memory objects */ 1926 typedef struct { 1927 char *label; 1928 atomic_t *counter; 1929 } sctp_dbg_objcnt_entry_t; 1930 1931 #endif /* __sctp_structs_h__ */ 1932