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, write to 25 * the Free Software Foundation, 59 Temple Place - Suite 330, 26 * Boston, MA 02111-1307, USA. 27 * 28 * Please send any bug reports or fixes you make to the 29 * email address(es): 30 * lksctp developers <linux-sctp@vger.kernel.org> 31 * 32 * Written or modified by: 33 * La Monte H.P. Yarroll <piggy@acm.org> 34 * Xingang Guo <xingang.guo@intel.com> 35 * Jon Grimm <jgrimm@us.ibm.com> 36 * Daisy Chang <daisyc@us.ibm.com> 37 * Sridhar Samudrala <sri@us.ibm.com> 38 * Ardelle Fan <ardelle.fan@intel.com> 39 * Ryan Layer <rmlayer@us.ibm.com> 40 * Kevin Gao <kevin.gao@intel.com> 41 */ 42 43 #ifndef __net_sctp_h__ 44 #define __net_sctp_h__ 45 46 /* Header Strategy. 47 * Start getting some control over the header file depencies: 48 * includes 49 * constants 50 * structs 51 * prototypes 52 * macros, externs, and inlines 53 * 54 * Move test_frame specific items out of the kernel headers 55 * and into the test frame headers. This is not perfect in any sense 56 * and will continue to evolve. 57 */ 58 59 #include <linux/types.h> 60 #include <linux/slab.h> 61 #include <linux/in.h> 62 #include <linux/tty.h> 63 #include <linux/proc_fs.h> 64 #include <linux/spinlock.h> 65 #include <linux/jiffies.h> 66 #include <linux/idr.h> 67 68 #if IS_ENABLED(CONFIG_IPV6) 69 #include <net/ipv6.h> 70 #include <net/ip6_route.h> 71 #endif 72 73 #include <asm/uaccess.h> 74 #include <asm/page.h> 75 #include <net/sock.h> 76 #include <net/snmp.h> 77 #include <net/sctp/structs.h> 78 #include <net/sctp/constants.h> 79 80 #ifdef CONFIG_IP_SCTP_MODULE 81 #define SCTP_PROTOSW_FLAG 0 82 #else /* static! */ 83 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 84 #endif 85 86 /* 87 * Function declarations. 88 */ 89 90 /* 91 * sctp/protocol.c 92 */ 93 extern int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, 94 sctp_scope_t, gfp_t gfp, 95 int flags); 96 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 97 extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 98 extern void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); 99 100 /* 101 * sctp/socket.c 102 */ 103 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 104 int sctp_inet_listen(struct socket *sock, int backlog); 105 void sctp_write_space(struct sock *sk); 106 void sctp_data_ready(struct sock *sk, int len); 107 unsigned int sctp_poll(struct file *file, struct socket *sock, 108 poll_table *wait); 109 void sctp_sock_rfree(struct sk_buff *skb); 110 void sctp_copy_sock(struct sock *newsk, struct sock *sk, 111 struct sctp_association *asoc); 112 extern struct percpu_counter sctp_sockets_allocated; 113 extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 114 115 /* 116 * sctp/primitive.c 117 */ 118 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 119 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 120 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 121 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 122 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 123 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); 124 125 /* 126 * sctp/input.c 127 */ 128 int sctp_rcv(struct sk_buff *skb); 129 void sctp_v4_err(struct sk_buff *skb, u32 info); 130 void sctp_hash_established(struct sctp_association *); 131 void sctp_unhash_established(struct sctp_association *); 132 void sctp_hash_endpoint(struct sctp_endpoint *); 133 void sctp_unhash_endpoint(struct sctp_endpoint *); 134 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, 135 struct sctphdr *, struct sctp_association **, 136 struct sctp_transport **); 137 void sctp_err_finish(struct sock *, struct sctp_association *); 138 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 139 struct sctp_transport *t, __u32 pmtu); 140 void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 141 struct sk_buff *); 142 void sctp_icmp_proto_unreachable(struct sock *sk, 143 struct sctp_association *asoc, 144 struct sctp_transport *t); 145 void sctp_backlog_migrate(struct sctp_association *assoc, 146 struct sock *oldsk, struct sock *newsk); 147 148 /* 149 * sctp/proc.c 150 */ 151 int sctp_snmp_proc_init(struct net *net); 152 void sctp_snmp_proc_exit(struct net *net); 153 int sctp_eps_proc_init(struct net *net); 154 void sctp_eps_proc_exit(struct net *net); 155 int sctp_assocs_proc_init(struct net *net); 156 void sctp_assocs_proc_exit(struct net *net); 157 int sctp_remaddr_proc_init(struct net *net); 158 void sctp_remaddr_proc_exit(struct net *net); 159 160 161 /* 162 * Module global variables 163 */ 164 165 /* 166 * sctp/protocol.c 167 */ 168 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 169 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 170 171 /* 172 * Section: Macros, externs, and inlines 173 */ 174 175 /* spin lock wrappers. */ 176 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 177 #define sctp_spin_unlock_irqrestore(lock, flags) \ 178 spin_unlock_irqrestore(lock, flags) 179 #define sctp_local_bh_disable() local_bh_disable() 180 #define sctp_local_bh_enable() local_bh_enable() 181 #define sctp_spin_lock(lock) spin_lock(lock) 182 #define sctp_spin_unlock(lock) spin_unlock(lock) 183 #define sctp_write_lock(lock) write_lock(lock) 184 #define sctp_write_unlock(lock) write_unlock(lock) 185 #define sctp_read_lock(lock) read_lock(lock) 186 #define sctp_read_unlock(lock) read_unlock(lock) 187 188 /* sock lock wrappers. */ 189 #define sctp_lock_sock(sk) lock_sock(sk) 190 #define sctp_release_sock(sk) release_sock(sk) 191 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 192 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 193 194 /* SCTP SNMP MIB stats handlers */ 195 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 196 #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) 197 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) 198 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 199 200 /* sctp mib definitions */ 201 enum { 202 SCTP_MIB_NUM = 0, 203 SCTP_MIB_CURRESTAB, /* CurrEstab */ 204 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 205 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 206 SCTP_MIB_ABORTEDS, /* Aborteds */ 207 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 208 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 209 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 210 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 211 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 212 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 213 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 214 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 215 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 216 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 217 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 218 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 219 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 220 SCTP_MIB_T1_INIT_EXPIREDS, 221 SCTP_MIB_T1_COOKIE_EXPIREDS, 222 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 223 SCTP_MIB_T3_RTX_EXPIREDS, 224 SCTP_MIB_T4_RTO_EXPIREDS, 225 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 226 SCTP_MIB_DELAY_SACK_EXPIREDS, 227 SCTP_MIB_AUTOCLOSE_EXPIREDS, 228 SCTP_MIB_T1_RETRANSMITS, 229 SCTP_MIB_T3_RETRANSMITS, 230 SCTP_MIB_PMTUD_RETRANSMITS, 231 SCTP_MIB_FAST_RETRANSMITS, 232 SCTP_MIB_IN_PKT_SOFTIRQ, 233 SCTP_MIB_IN_PKT_BACKLOG, 234 SCTP_MIB_IN_PKT_DISCARDS, 235 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 236 __SCTP_MIB_MAX 237 }; 238 239 #define SCTP_MIB_MAX __SCTP_MIB_MAX 240 struct sctp_mib { 241 unsigned long mibs[SCTP_MIB_MAX]; 242 }; 243 244 /* helper function to track stats about max rto and related transport */ 245 static inline void sctp_max_rto(struct sctp_association *asoc, 246 struct sctp_transport *trans) 247 { 248 if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 249 asoc->stats.max_obs_rto = trans->rto; 250 memset(&asoc->stats.obs_rto_ipaddr, 0, 251 sizeof(struct sockaddr_storage)); 252 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 253 trans->af_specific->sockaddr_len); 254 } 255 } 256 257 /* 258 * Macros for keeping a global reference of object allocations. 259 */ 260 #ifdef CONFIG_SCTP_DBG_OBJCNT 261 262 extern atomic_t sctp_dbg_objcnt_sock; 263 extern atomic_t sctp_dbg_objcnt_ep; 264 extern atomic_t sctp_dbg_objcnt_assoc; 265 extern atomic_t sctp_dbg_objcnt_transport; 266 extern atomic_t sctp_dbg_objcnt_chunk; 267 extern atomic_t sctp_dbg_objcnt_bind_addr; 268 extern atomic_t sctp_dbg_objcnt_bind_bucket; 269 extern atomic_t sctp_dbg_objcnt_addr; 270 extern atomic_t sctp_dbg_objcnt_ssnmap; 271 extern atomic_t sctp_dbg_objcnt_datamsg; 272 extern atomic_t sctp_dbg_objcnt_keys; 273 274 /* Macros to atomically increment/decrement objcnt counters. */ 275 #define SCTP_DBG_OBJCNT_INC(name) \ 276 atomic_inc(&sctp_dbg_objcnt_## name) 277 #define SCTP_DBG_OBJCNT_DEC(name) \ 278 atomic_dec(&sctp_dbg_objcnt_## name) 279 #define SCTP_DBG_OBJCNT(name) \ 280 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 281 282 /* Macro to help create new entries in in the global array of 283 * objcnt counters. 284 */ 285 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 286 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 287 288 void sctp_dbg_objcnt_init(struct net *); 289 void sctp_dbg_objcnt_exit(struct net *); 290 291 #else 292 293 #define SCTP_DBG_OBJCNT_INC(name) 294 #define SCTP_DBG_OBJCNT_DEC(name) 295 296 static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 297 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 298 299 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 300 301 #if defined CONFIG_SYSCTL 302 void sctp_sysctl_register(void); 303 void sctp_sysctl_unregister(void); 304 int sctp_sysctl_net_register(struct net *net); 305 void sctp_sysctl_net_unregister(struct net *net); 306 #else 307 static inline void sctp_sysctl_register(void) { return; } 308 static inline void sctp_sysctl_unregister(void) { return; } 309 static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 310 static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 311 #endif 312 313 /* Size of Supported Address Parameter for 'x' address types. */ 314 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 315 316 #if IS_ENABLED(CONFIG_IPV6) 317 318 void sctp_v6_pf_init(void); 319 void sctp_v6_pf_exit(void); 320 int sctp_v6_protosw_init(void); 321 void sctp_v6_protosw_exit(void); 322 int sctp_v6_add_protocol(void); 323 void sctp_v6_del_protocol(void); 324 325 #else /* #ifdef defined(CONFIG_IPV6) */ 326 327 static inline void sctp_v6_pf_init(void) { return; } 328 static inline void sctp_v6_pf_exit(void) { return; } 329 static inline int sctp_v6_protosw_init(void) { return 0; } 330 static inline void sctp_v6_protosw_exit(void) { return; } 331 static inline int sctp_v6_add_protocol(void) { return 0; } 332 static inline void sctp_v6_del_protocol(void) { return; } 333 334 #endif /* #if defined(CONFIG_IPV6) */ 335 336 337 /* Map an association to an assoc_id. */ 338 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 339 { 340 return asoc ? asoc->assoc_id : 0; 341 } 342 343 /* Look up the association by its id. */ 344 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 345 346 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 347 348 /* A macro to walk a list of skbs. */ 349 #define sctp_skb_for_each(pos, head, tmp) \ 350 skb_queue_walk_safe(head, pos, tmp) 351 352 /* A helper to append an entire skb list (list) to another (head). */ 353 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 354 struct sk_buff_head *head) 355 { 356 unsigned long flags; 357 358 sctp_spin_lock_irqsave(&head->lock, flags); 359 sctp_spin_lock(&list->lock); 360 361 skb_queue_splice_tail_init(list, head); 362 363 sctp_spin_unlock(&list->lock); 364 sctp_spin_unlock_irqrestore(&head->lock, flags); 365 } 366 367 /** 368 * sctp_list_dequeue - remove from the head of the queue 369 * @list: list to dequeue from 370 * 371 * Remove the head of the list. The head item is 372 * returned or %NULL if the list is empty. 373 */ 374 375 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 376 { 377 struct list_head *result = NULL; 378 379 if (list->next != list) { 380 result = list->next; 381 list->next = result->next; 382 list->next->prev = list; 383 INIT_LIST_HEAD(result); 384 } 385 return result; 386 } 387 388 /* SCTP version of skb_set_owner_r. We need this one because 389 * of the way we have to do receive buffer accounting on bundled 390 * chunks. 391 */ 392 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 393 { 394 struct sctp_ulpevent *event = sctp_skb2event(skb); 395 396 skb_orphan(skb); 397 skb->sk = sk; 398 skb->destructor = sctp_sock_rfree; 399 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 400 /* 401 * This mimics the behavior of skb_set_owner_r 402 */ 403 sk->sk_forward_alloc -= event->rmem_len; 404 } 405 406 /* Tests if the list has one and only one entry. */ 407 static inline int sctp_list_single_entry(struct list_head *head) 408 { 409 return (head->next != head) && (head->next == head->prev); 410 } 411 412 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 413 static inline __s32 sctp_jitter(__u32 rto) 414 { 415 static __u32 sctp_rand; 416 __s32 ret; 417 418 /* Avoid divide by zero. */ 419 if (!rto) 420 rto = 1; 421 422 sctp_rand += jiffies; 423 sctp_rand ^= (sctp_rand << 12); 424 sctp_rand ^= (sctp_rand >> 20); 425 426 /* Choose random number from 0 to rto, then move to -50% ~ +50% 427 * of rto. 428 */ 429 ret = sctp_rand % rto - (rto >> 1); 430 return ret; 431 } 432 433 /* Break down data chunks at this point. */ 434 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 435 { 436 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 437 int frag = pmtu; 438 439 frag -= sp->pf->af->net_header_len; 440 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 441 442 if (asoc->user_frag) 443 frag = min_t(int, frag, asoc->user_frag); 444 445 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 446 447 return frag; 448 } 449 450 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) 451 { 452 453 sctp_assoc_sync_pmtu(sk, asoc); 454 asoc->pmtu_pending = 0; 455 } 456 457 /* Walk through a list of TLV parameters. Don't trust the 458 * individual parameter lengths and instead depend on 459 * the chunk length to indicate when to stop. Make sure 460 * there is room for a param header too. 461 */ 462 #define sctp_walk_params(pos, chunk, member)\ 463 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 464 465 #define _sctp_walk_params(pos, chunk, end, member)\ 466 for (pos.v = chunk->member;\ 467 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 468 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 469 pos.v += WORD_ROUND(ntohs(pos.p->length))) 470 471 #define sctp_walk_errors(err, chunk_hdr)\ 472 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 473 474 #define _sctp_walk_errors(err, chunk_hdr, end)\ 475 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 476 sizeof(sctp_chunkhdr_t));\ 477 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 478 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 479 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 480 481 #define sctp_walk_fwdtsn(pos, chunk)\ 482 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 483 484 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 485 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 486 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 487 pos++) 488 489 /* Round an int up to the next multiple of 4. */ 490 #define WORD_ROUND(s) (((s)+3)&~3) 491 492 /* External references. */ 493 494 extern struct proto sctp_prot; 495 extern struct proto sctpv6_prot; 496 void sctp_put_port(struct sock *sk); 497 498 extern struct idr sctp_assocs_id; 499 extern spinlock_t sctp_assocs_id_lock; 500 501 /* Static inline functions. */ 502 503 /* Convert from an IP version number to an Address Family symbol. */ 504 static inline int ipver2af(__u8 ipver) 505 { 506 switch (ipver) { 507 case 4: 508 return AF_INET; 509 case 6: 510 return AF_INET6; 511 default: 512 return 0; 513 } 514 } 515 516 /* Convert from an address parameter type to an address family. */ 517 static inline int param_type2af(__be16 type) 518 { 519 switch (type) { 520 case SCTP_PARAM_IPV4_ADDRESS: 521 return AF_INET; 522 case SCTP_PARAM_IPV6_ADDRESS: 523 return AF_INET6; 524 default: 525 return 0; 526 } 527 } 528 529 /* Warning: The following hash functions assume a power of two 'size'. */ 530 /* This is the hash function for the SCTP port hash table. */ 531 static inline int sctp_phashfn(struct net *net, __u16 lport) 532 { 533 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 534 } 535 536 /* This is the hash function for the endpoint hash table. */ 537 static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 538 { 539 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 540 } 541 542 /* This is the hash function for the association hash table. */ 543 static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport) 544 { 545 int h = (lport << 16) + rport + net_hash_mix(net); 546 h ^= h>>8; 547 return h & (sctp_assoc_hashsize - 1); 548 } 549 550 /* This is the hash function for the association hash table. This is 551 * not used yet, but could be used as a better hash function when 552 * we have a vtag. 553 */ 554 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 555 { 556 int h = (lport << 16) + rport; 557 h ^= vtag; 558 return h & (sctp_assoc_hashsize - 1); 559 } 560 561 #define sctp_for_each_hentry(epb, head) \ 562 hlist_for_each_entry(epb, head, node) 563 564 /* Is a socket of this style? */ 565 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 566 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 567 { 568 return sctp_sk(sk)->type == style; 569 } 570 571 /* Is the association in this state? */ 572 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 573 static inline int __sctp_state(const struct sctp_association *asoc, 574 sctp_state_t state) 575 { 576 return asoc->state == state; 577 } 578 579 /* Is the socket in this state? */ 580 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 581 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 582 { 583 return sk->sk_state == state; 584 } 585 586 /* Map v4-mapped v6 address back to v4 address */ 587 static inline void sctp_v6_map_v4(union sctp_addr *addr) 588 { 589 addr->v4.sin_family = AF_INET; 590 addr->v4.sin_port = addr->v6.sin6_port; 591 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 592 } 593 594 /* Map v4 address to v4-mapped v6 address */ 595 static inline void sctp_v4_map_v6(union sctp_addr *addr) 596 { 597 addr->v6.sin6_family = AF_INET6; 598 addr->v6.sin6_port = addr->v4.sin_port; 599 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 600 addr->v6.sin6_addr.s6_addr32[0] = 0; 601 addr->v6.sin6_addr.s6_addr32[1] = 0; 602 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 603 } 604 605 /* The cookie is always 0 since this is how it's used in the 606 * pmtu code. 607 */ 608 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 609 { 610 if (t->dst && !dst_check(t->dst, t->dst_cookie)) { 611 dst_release(t->dst); 612 t->dst = NULL; 613 } 614 615 return t->dst; 616 } 617 618 #endif /* __net_sctp_h__ */ 619