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) 2001-2003 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * The base lksctp header. 10 * 11 * This SCTP implementation is free software; 12 * you can redistribute it and/or modify it under the terms of 13 * the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This SCTP implementation is distributed in the hope that it 18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 19 * ************************ 20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 21 * See the GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with GNU CC; see the file COPYING. If not, see 25 * <http://www.gnu.org/licenses/>. 26 * 27 * Please send any bug reports or fixes you make to the 28 * email address(es): 29 * lksctp developers <linux-sctp@vger.kernel.org> 30 * 31 * Written or modified by: 32 * La Monte H.P. Yarroll <piggy@acm.org> 33 * Xingang Guo <xingang.guo@intel.com> 34 * Jon Grimm <jgrimm@us.ibm.com> 35 * Daisy Chang <daisyc@us.ibm.com> 36 * Sridhar Samudrala <sri@us.ibm.com> 37 * Ardelle Fan <ardelle.fan@intel.com> 38 * Ryan Layer <rmlayer@us.ibm.com> 39 * Kevin Gao <kevin.gao@intel.com> 40 */ 41 42 #ifndef __net_sctp_h__ 43 #define __net_sctp_h__ 44 45 /* Header Strategy. 46 * Start getting some control over the header file depencies: 47 * includes 48 * constants 49 * structs 50 * prototypes 51 * macros, externs, and inlines 52 * 53 * Move test_frame specific items out of the kernel headers 54 * and into the test frame headers. This is not perfect in any sense 55 * and will continue to evolve. 56 */ 57 58 #include <linux/types.h> 59 #include <linux/slab.h> 60 #include <linux/in.h> 61 #include <linux/tty.h> 62 #include <linux/proc_fs.h> 63 #include <linux/spinlock.h> 64 #include <linux/jiffies.h> 65 #include <linux/idr.h> 66 67 #if IS_ENABLED(CONFIG_IPV6) 68 #include <net/ipv6.h> 69 #include <net/ip6_route.h> 70 #endif 71 72 #include <asm/uaccess.h> 73 #include <asm/page.h> 74 #include <net/sock.h> 75 #include <net/snmp.h> 76 #include <net/sctp/structs.h> 77 #include <net/sctp/constants.h> 78 79 #ifdef CONFIG_IP_SCTP_MODULE 80 #define SCTP_PROTOSW_FLAG 0 81 #else /* static! */ 82 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 83 #endif 84 85 /* 86 * Function declarations. 87 */ 88 89 /* 90 * sctp/protocol.c 91 */ 92 int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, 93 sctp_scope_t, gfp_t gfp, int flags); 94 struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 95 int sctp_register_pf(struct sctp_pf *, sa_family_t); 96 void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); 97 98 /* 99 * sctp/socket.c 100 */ 101 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 102 int sctp_inet_listen(struct socket *sock, int backlog); 103 void sctp_write_space(struct sock *sk); 104 void sctp_data_ready(struct sock *sk, int len); 105 unsigned int sctp_poll(struct file *file, struct socket *sock, 106 poll_table *wait); 107 void sctp_sock_rfree(struct sk_buff *skb); 108 void sctp_copy_sock(struct sock *newsk, struct sock *sk, 109 struct sctp_association *asoc); 110 extern struct percpu_counter sctp_sockets_allocated; 111 int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 112 113 /* 114 * sctp/primitive.c 115 */ 116 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 117 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 118 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 119 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 120 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 121 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); 122 123 /* 124 * sctp/input.c 125 */ 126 int sctp_rcv(struct sk_buff *skb); 127 void sctp_v4_err(struct sk_buff *skb, u32 info); 128 void sctp_hash_established(struct sctp_association *); 129 void sctp_unhash_established(struct sctp_association *); 130 void sctp_hash_endpoint(struct sctp_endpoint *); 131 void sctp_unhash_endpoint(struct sctp_endpoint *); 132 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, 133 struct sctphdr *, struct sctp_association **, 134 struct sctp_transport **); 135 void sctp_err_finish(struct sock *, struct sctp_association *); 136 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 137 struct sctp_transport *t, __u32 pmtu); 138 void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 139 struct sk_buff *); 140 void sctp_icmp_proto_unreachable(struct sock *sk, 141 struct sctp_association *asoc, 142 struct sctp_transport *t); 143 void sctp_backlog_migrate(struct sctp_association *assoc, 144 struct sock *oldsk, struct sock *newsk); 145 146 /* 147 * sctp/proc.c 148 */ 149 int sctp_snmp_proc_init(struct net *net); 150 void sctp_snmp_proc_exit(struct net *net); 151 int sctp_eps_proc_init(struct net *net); 152 void sctp_eps_proc_exit(struct net *net); 153 int sctp_assocs_proc_init(struct net *net); 154 void sctp_assocs_proc_exit(struct net *net); 155 int sctp_remaddr_proc_init(struct net *net); 156 void sctp_remaddr_proc_exit(struct net *net); 157 158 159 /* 160 * Module global variables 161 */ 162 163 /* 164 * sctp/protocol.c 165 */ 166 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 167 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 168 169 /* 170 * Section: Macros, externs, and inlines 171 */ 172 173 /* spin lock wrappers. */ 174 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 175 #define sctp_spin_unlock_irqrestore(lock, flags) \ 176 spin_unlock_irqrestore(lock, flags) 177 #define sctp_local_bh_disable() local_bh_disable() 178 #define sctp_local_bh_enable() local_bh_enable() 179 #define sctp_spin_lock(lock) spin_lock(lock) 180 #define sctp_spin_unlock(lock) spin_unlock(lock) 181 #define sctp_write_lock(lock) write_lock(lock) 182 #define sctp_write_unlock(lock) write_unlock(lock) 183 #define sctp_read_lock(lock) read_lock(lock) 184 #define sctp_read_unlock(lock) read_unlock(lock) 185 186 /* sock lock wrappers. */ 187 #define sctp_lock_sock(sk) lock_sock(sk) 188 #define sctp_release_sock(sk) release_sock(sk) 189 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 190 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 191 192 /* SCTP SNMP MIB stats handlers */ 193 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 194 #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) 195 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) 196 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 197 198 /* sctp mib definitions */ 199 enum { 200 SCTP_MIB_NUM = 0, 201 SCTP_MIB_CURRESTAB, /* CurrEstab */ 202 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 203 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 204 SCTP_MIB_ABORTEDS, /* Aborteds */ 205 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 206 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 207 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 208 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 209 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 210 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 211 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 212 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 213 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 214 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 215 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 216 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 217 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 218 SCTP_MIB_T1_INIT_EXPIREDS, 219 SCTP_MIB_T1_COOKIE_EXPIREDS, 220 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 221 SCTP_MIB_T3_RTX_EXPIREDS, 222 SCTP_MIB_T4_RTO_EXPIREDS, 223 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 224 SCTP_MIB_DELAY_SACK_EXPIREDS, 225 SCTP_MIB_AUTOCLOSE_EXPIREDS, 226 SCTP_MIB_T1_RETRANSMITS, 227 SCTP_MIB_T3_RETRANSMITS, 228 SCTP_MIB_PMTUD_RETRANSMITS, 229 SCTP_MIB_FAST_RETRANSMITS, 230 SCTP_MIB_IN_PKT_SOFTIRQ, 231 SCTP_MIB_IN_PKT_BACKLOG, 232 SCTP_MIB_IN_PKT_DISCARDS, 233 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 234 __SCTP_MIB_MAX 235 }; 236 237 #define SCTP_MIB_MAX __SCTP_MIB_MAX 238 struct sctp_mib { 239 unsigned long mibs[SCTP_MIB_MAX]; 240 }; 241 242 /* helper function to track stats about max rto and related transport */ 243 static inline void sctp_max_rto(struct sctp_association *asoc, 244 struct sctp_transport *trans) 245 { 246 if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 247 asoc->stats.max_obs_rto = trans->rto; 248 memset(&asoc->stats.obs_rto_ipaddr, 0, 249 sizeof(struct sockaddr_storage)); 250 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 251 trans->af_specific->sockaddr_len); 252 } 253 } 254 255 /* 256 * Macros for keeping a global reference of object allocations. 257 */ 258 #ifdef CONFIG_SCTP_DBG_OBJCNT 259 260 extern atomic_t sctp_dbg_objcnt_sock; 261 extern atomic_t sctp_dbg_objcnt_ep; 262 extern atomic_t sctp_dbg_objcnt_assoc; 263 extern atomic_t sctp_dbg_objcnt_transport; 264 extern atomic_t sctp_dbg_objcnt_chunk; 265 extern atomic_t sctp_dbg_objcnt_bind_addr; 266 extern atomic_t sctp_dbg_objcnt_bind_bucket; 267 extern atomic_t sctp_dbg_objcnt_addr; 268 extern atomic_t sctp_dbg_objcnt_ssnmap; 269 extern atomic_t sctp_dbg_objcnt_datamsg; 270 extern atomic_t sctp_dbg_objcnt_keys; 271 272 /* Macros to atomically increment/decrement objcnt counters. */ 273 #define SCTP_DBG_OBJCNT_INC(name) \ 274 atomic_inc(&sctp_dbg_objcnt_## name) 275 #define SCTP_DBG_OBJCNT_DEC(name) \ 276 atomic_dec(&sctp_dbg_objcnt_## name) 277 #define SCTP_DBG_OBJCNT(name) \ 278 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 279 280 /* Macro to help create new entries in in the global array of 281 * objcnt counters. 282 */ 283 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 284 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 285 286 void sctp_dbg_objcnt_init(struct net *); 287 void sctp_dbg_objcnt_exit(struct net *); 288 289 #else 290 291 #define SCTP_DBG_OBJCNT_INC(name) 292 #define SCTP_DBG_OBJCNT_DEC(name) 293 294 static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 295 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 296 297 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 298 299 #if defined CONFIG_SYSCTL 300 void sctp_sysctl_register(void); 301 void sctp_sysctl_unregister(void); 302 int sctp_sysctl_net_register(struct net *net); 303 void sctp_sysctl_net_unregister(struct net *net); 304 #else 305 static inline void sctp_sysctl_register(void) { return; } 306 static inline void sctp_sysctl_unregister(void) { return; } 307 static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 308 static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 309 #endif 310 311 /* Size of Supported Address Parameter for 'x' address types. */ 312 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 313 314 #if IS_ENABLED(CONFIG_IPV6) 315 316 void sctp_v6_pf_init(void); 317 void sctp_v6_pf_exit(void); 318 int sctp_v6_protosw_init(void); 319 void sctp_v6_protosw_exit(void); 320 int sctp_v6_add_protocol(void); 321 void sctp_v6_del_protocol(void); 322 323 #else /* #ifdef defined(CONFIG_IPV6) */ 324 325 static inline void sctp_v6_pf_init(void) { return; } 326 static inline void sctp_v6_pf_exit(void) { return; } 327 static inline int sctp_v6_protosw_init(void) { return 0; } 328 static inline void sctp_v6_protosw_exit(void) { return; } 329 static inline int sctp_v6_add_protocol(void) { return 0; } 330 static inline void sctp_v6_del_protocol(void) { return; } 331 332 #endif /* #if defined(CONFIG_IPV6) */ 333 334 335 /* Map an association to an assoc_id. */ 336 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 337 { 338 return asoc ? asoc->assoc_id : 0; 339 } 340 341 /* Look up the association by its id. */ 342 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 343 344 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 345 346 /* A macro to walk a list of skbs. */ 347 #define sctp_skb_for_each(pos, head, tmp) \ 348 skb_queue_walk_safe(head, pos, tmp) 349 350 /* A helper to append an entire skb list (list) to another (head). */ 351 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 352 struct sk_buff_head *head) 353 { 354 unsigned long flags; 355 356 sctp_spin_lock_irqsave(&head->lock, flags); 357 sctp_spin_lock(&list->lock); 358 359 skb_queue_splice_tail_init(list, head); 360 361 sctp_spin_unlock(&list->lock); 362 sctp_spin_unlock_irqrestore(&head->lock, flags); 363 } 364 365 /** 366 * sctp_list_dequeue - remove from the head of the queue 367 * @list: list to dequeue from 368 * 369 * Remove the head of the list. The head item is 370 * returned or %NULL if the list is empty. 371 */ 372 373 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 374 { 375 struct list_head *result = NULL; 376 377 if (list->next != list) { 378 result = list->next; 379 list->next = result->next; 380 list->next->prev = list; 381 INIT_LIST_HEAD(result); 382 } 383 return result; 384 } 385 386 /* SCTP version of skb_set_owner_r. We need this one because 387 * of the way we have to do receive buffer accounting on bundled 388 * chunks. 389 */ 390 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 391 { 392 struct sctp_ulpevent *event = sctp_skb2event(skb); 393 394 skb_orphan(skb); 395 skb->sk = sk; 396 skb->destructor = sctp_sock_rfree; 397 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 398 /* 399 * This mimics the behavior of skb_set_owner_r 400 */ 401 sk->sk_forward_alloc -= event->rmem_len; 402 } 403 404 /* Tests if the list has one and only one entry. */ 405 static inline int sctp_list_single_entry(struct list_head *head) 406 { 407 return (head->next != head) && (head->next == head->prev); 408 } 409 410 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 411 static inline __s32 sctp_jitter(__u32 rto) 412 { 413 static __u32 sctp_rand; 414 __s32 ret; 415 416 /* Avoid divide by zero. */ 417 if (!rto) 418 rto = 1; 419 420 sctp_rand += jiffies; 421 sctp_rand ^= (sctp_rand << 12); 422 sctp_rand ^= (sctp_rand >> 20); 423 424 /* Choose random number from 0 to rto, then move to -50% ~ +50% 425 * of rto. 426 */ 427 ret = sctp_rand % rto - (rto >> 1); 428 return ret; 429 } 430 431 /* Break down data chunks at this point. */ 432 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 433 { 434 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 435 int frag = pmtu; 436 437 frag -= sp->pf->af->net_header_len; 438 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 439 440 if (asoc->user_frag) 441 frag = min_t(int, frag, asoc->user_frag); 442 443 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 444 445 return frag; 446 } 447 448 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) 449 { 450 451 sctp_assoc_sync_pmtu(sk, asoc); 452 asoc->pmtu_pending = 0; 453 } 454 455 /* Walk through a list of TLV parameters. Don't trust the 456 * individual parameter lengths and instead depend on 457 * the chunk length to indicate when to stop. Make sure 458 * there is room for a param header too. 459 */ 460 #define sctp_walk_params(pos, chunk, member)\ 461 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 462 463 #define _sctp_walk_params(pos, chunk, end, member)\ 464 for (pos.v = chunk->member;\ 465 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 466 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 467 pos.v += WORD_ROUND(ntohs(pos.p->length))) 468 469 #define sctp_walk_errors(err, chunk_hdr)\ 470 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 471 472 #define _sctp_walk_errors(err, chunk_hdr, end)\ 473 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 474 sizeof(sctp_chunkhdr_t));\ 475 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 476 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 477 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 478 479 #define sctp_walk_fwdtsn(pos, chunk)\ 480 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 481 482 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 483 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 484 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 485 pos++) 486 487 /* Round an int up to the next multiple of 4. */ 488 #define WORD_ROUND(s) (((s)+3)&~3) 489 490 /* External references. */ 491 492 extern struct proto sctp_prot; 493 extern struct proto sctpv6_prot; 494 void sctp_put_port(struct sock *sk); 495 496 extern struct idr sctp_assocs_id; 497 extern spinlock_t sctp_assocs_id_lock; 498 499 /* Static inline functions. */ 500 501 /* Convert from an IP version number to an Address Family symbol. */ 502 static inline int ipver2af(__u8 ipver) 503 { 504 switch (ipver) { 505 case 4: 506 return AF_INET; 507 case 6: 508 return AF_INET6; 509 default: 510 return 0; 511 } 512 } 513 514 /* Convert from an address parameter type to an address family. */ 515 static inline int param_type2af(__be16 type) 516 { 517 switch (type) { 518 case SCTP_PARAM_IPV4_ADDRESS: 519 return AF_INET; 520 case SCTP_PARAM_IPV6_ADDRESS: 521 return AF_INET6; 522 default: 523 return 0; 524 } 525 } 526 527 /* Warning: The following hash functions assume a power of two 'size'. */ 528 /* This is the hash function for the SCTP port hash table. */ 529 static inline int sctp_phashfn(struct net *net, __u16 lport) 530 { 531 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 532 } 533 534 /* This is the hash function for the endpoint hash table. */ 535 static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 536 { 537 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 538 } 539 540 /* This is the hash function for the association hash table. */ 541 static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport) 542 { 543 int h = (lport << 16) + rport + net_hash_mix(net); 544 h ^= h>>8; 545 return h & (sctp_assoc_hashsize - 1); 546 } 547 548 /* This is the hash function for the association hash table. This is 549 * not used yet, but could be used as a better hash function when 550 * we have a vtag. 551 */ 552 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 553 { 554 int h = (lport << 16) + rport; 555 h ^= vtag; 556 return h & (sctp_assoc_hashsize - 1); 557 } 558 559 #define sctp_for_each_hentry(epb, head) \ 560 hlist_for_each_entry(epb, head, node) 561 562 /* Is a socket of this style? */ 563 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 564 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 565 { 566 return sctp_sk(sk)->type == style; 567 } 568 569 /* Is the association in this state? */ 570 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 571 static inline int __sctp_state(const struct sctp_association *asoc, 572 sctp_state_t state) 573 { 574 return asoc->state == state; 575 } 576 577 /* Is the socket in this state? */ 578 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 579 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 580 { 581 return sk->sk_state == state; 582 } 583 584 /* Map v4-mapped v6 address back to v4 address */ 585 static inline void sctp_v6_map_v4(union sctp_addr *addr) 586 { 587 addr->v4.sin_family = AF_INET; 588 addr->v4.sin_port = addr->v6.sin6_port; 589 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 590 } 591 592 /* Map v4 address to v4-mapped v6 address */ 593 static inline void sctp_v4_map_v6(union sctp_addr *addr) 594 { 595 addr->v6.sin6_family = AF_INET6; 596 addr->v6.sin6_port = addr->v4.sin_port; 597 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 598 addr->v6.sin6_addr.s6_addr32[0] = 0; 599 addr->v6.sin6_addr.s6_addr32[1] = 0; 600 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 601 } 602 603 /* The cookie is always 0 since this is how it's used in the 604 * pmtu code. 605 */ 606 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 607 { 608 if (t->dst && !dst_check(t->dst, t->dst_cookie)) { 609 dst_release(t->dst); 610 t->dst = NULL; 611 } 612 613 return t->dst; 614 } 615 616 #endif /* __net_sctp_h__ */ 617