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