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 <lksctp-developers@lists.sourceforge.net> 31 * 32 * Or submit a bug report through the following website: 33 * http://www.sf.net/projects/lksctp 34 * 35 * Written or modified by: 36 * La Monte H.P. Yarroll <piggy@acm.org> 37 * Xingang Guo <xingang.guo@intel.com> 38 * Jon Grimm <jgrimm@us.ibm.com> 39 * Daisy Chang <daisyc@us.ibm.com> 40 * Sridhar Samudrala <sri@us.ibm.com> 41 * Ardelle Fan <ardelle.fan@intel.com> 42 * Ryan Layer <rmlayer@us.ibm.com> 43 * Kevin Gao <kevin.gao@intel.com> 44 * 45 * Any bugs reported given to us we will try to fix... any fixes shared will 46 * be incorporated into the next SCTP release. 47 */ 48 49 #ifndef __net_sctp_h__ 50 #define __net_sctp_h__ 51 52 /* Header Strategy. 53 * Start getting some control over the header file depencies: 54 * includes 55 * constants 56 * structs 57 * prototypes 58 * macros, externs, and inlines 59 * 60 * Move test_frame specific items out of the kernel headers 61 * and into the test frame headers. This is not perfect in any sense 62 * and will continue to evolve. 63 */ 64 65 #include <linux/types.h> 66 #include <linux/slab.h> 67 #include <linux/in.h> 68 #include <linux/tty.h> 69 #include <linux/proc_fs.h> 70 #include <linux/spinlock.h> 71 #include <linux/jiffies.h> 72 #include <linux/idr.h> 73 74 #if IS_ENABLED(CONFIG_IPV6) 75 #include <net/ipv6.h> 76 #include <net/ip6_route.h> 77 #endif 78 79 #include <asm/uaccess.h> 80 #include <asm/page.h> 81 #include <net/sock.h> 82 #include <net/snmp.h> 83 #include <net/sctp/structs.h> 84 #include <net/sctp/constants.h> 85 86 #ifdef CONFIG_IP_SCTP_MODULE 87 #define SCTP_PROTOSW_FLAG 0 88 #else /* static! */ 89 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 90 #endif 91 92 /* 93 * Function declarations. 94 */ 95 96 /* 97 * sctp/protocol.c 98 */ 99 extern int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, 100 sctp_scope_t, gfp_t gfp, 101 int flags); 102 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 103 extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 104 extern void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); 105 106 /* 107 * sctp/socket.c 108 */ 109 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 110 int sctp_inet_listen(struct socket *sock, int backlog); 111 void sctp_write_space(struct sock *sk); 112 void sctp_data_ready(struct sock *sk, int len); 113 unsigned int sctp_poll(struct file *file, struct socket *sock, 114 poll_table *wait); 115 void sctp_sock_rfree(struct sk_buff *skb); 116 void sctp_copy_sock(struct sock *newsk, struct sock *sk, 117 struct sctp_association *asoc); 118 extern struct percpu_counter sctp_sockets_allocated; 119 extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 120 121 /* 122 * sctp/primitive.c 123 */ 124 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 125 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 126 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 127 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 128 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 129 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); 130 131 /* 132 * sctp/input.c 133 */ 134 int sctp_rcv(struct sk_buff *skb); 135 void sctp_v4_err(struct sk_buff *skb, u32 info); 136 void sctp_hash_established(struct sctp_association *); 137 void sctp_unhash_established(struct sctp_association *); 138 void sctp_hash_endpoint(struct sctp_endpoint *); 139 void sctp_unhash_endpoint(struct sctp_endpoint *); 140 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, 141 struct sctphdr *, struct sctp_association **, 142 struct sctp_transport **); 143 void sctp_err_finish(struct sock *, struct sctp_association *); 144 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 145 struct sctp_transport *t, __u32 pmtu); 146 void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 147 struct sk_buff *); 148 void sctp_icmp_proto_unreachable(struct sock *sk, 149 struct sctp_association *asoc, 150 struct sctp_transport *t); 151 void sctp_backlog_migrate(struct sctp_association *assoc, 152 struct sock *oldsk, struct sock *newsk); 153 154 /* 155 * sctp/proc.c 156 */ 157 int sctp_snmp_proc_init(struct net *net); 158 void sctp_snmp_proc_exit(struct net *net); 159 int sctp_eps_proc_init(struct net *net); 160 void sctp_eps_proc_exit(struct net *net); 161 int sctp_assocs_proc_init(struct net *net); 162 void sctp_assocs_proc_exit(struct net *net); 163 int sctp_remaddr_proc_init(struct net *net); 164 void sctp_remaddr_proc_exit(struct net *net); 165 166 167 /* 168 * Module global variables 169 */ 170 171 /* 172 * sctp/protocol.c 173 */ 174 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 175 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 176 177 /* 178 * Section: Macros, externs, and inlines 179 */ 180 181 /* spin lock wrappers. */ 182 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 183 #define sctp_spin_unlock_irqrestore(lock, flags) \ 184 spin_unlock_irqrestore(lock, flags) 185 #define sctp_local_bh_disable() local_bh_disable() 186 #define sctp_local_bh_enable() local_bh_enable() 187 #define sctp_spin_lock(lock) spin_lock(lock) 188 #define sctp_spin_unlock(lock) spin_unlock(lock) 189 #define sctp_write_lock(lock) write_lock(lock) 190 #define sctp_write_unlock(lock) write_unlock(lock) 191 #define sctp_read_lock(lock) read_lock(lock) 192 #define sctp_read_unlock(lock) read_unlock(lock) 193 194 /* sock lock wrappers. */ 195 #define sctp_lock_sock(sk) lock_sock(sk) 196 #define sctp_release_sock(sk) release_sock(sk) 197 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 198 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 199 200 /* SCTP SNMP MIB stats handlers */ 201 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 202 #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) 203 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) 204 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 205 206 /* sctp mib definitions */ 207 enum { 208 SCTP_MIB_NUM = 0, 209 SCTP_MIB_CURRESTAB, /* CurrEstab */ 210 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 211 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 212 SCTP_MIB_ABORTEDS, /* Aborteds */ 213 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 214 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 215 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 216 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 217 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 218 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 219 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 220 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 221 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 222 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 223 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 224 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 225 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 226 SCTP_MIB_T1_INIT_EXPIREDS, 227 SCTP_MIB_T1_COOKIE_EXPIREDS, 228 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 229 SCTP_MIB_T3_RTX_EXPIREDS, 230 SCTP_MIB_T4_RTO_EXPIREDS, 231 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 232 SCTP_MIB_DELAY_SACK_EXPIREDS, 233 SCTP_MIB_AUTOCLOSE_EXPIREDS, 234 SCTP_MIB_T1_RETRANSMITS, 235 SCTP_MIB_T3_RETRANSMITS, 236 SCTP_MIB_PMTUD_RETRANSMITS, 237 SCTP_MIB_FAST_RETRANSMITS, 238 SCTP_MIB_IN_PKT_SOFTIRQ, 239 SCTP_MIB_IN_PKT_BACKLOG, 240 SCTP_MIB_IN_PKT_DISCARDS, 241 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 242 __SCTP_MIB_MAX 243 }; 244 245 #define SCTP_MIB_MAX __SCTP_MIB_MAX 246 struct sctp_mib { 247 unsigned long mibs[SCTP_MIB_MAX]; 248 }; 249 250 /* helper function to track stats about max rto and related transport */ 251 static inline void sctp_max_rto(struct sctp_association *asoc, 252 struct sctp_transport *trans) 253 { 254 if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 255 asoc->stats.max_obs_rto = trans->rto; 256 memset(&asoc->stats.obs_rto_ipaddr, 0, 257 sizeof(struct sockaddr_storage)); 258 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 259 trans->af_specific->sockaddr_len); 260 } 261 } 262 263 /* 264 * Macros for keeping a global reference of object allocations. 265 */ 266 #ifdef CONFIG_SCTP_DBG_OBJCNT 267 268 extern atomic_t sctp_dbg_objcnt_sock; 269 extern atomic_t sctp_dbg_objcnt_ep; 270 extern atomic_t sctp_dbg_objcnt_assoc; 271 extern atomic_t sctp_dbg_objcnt_transport; 272 extern atomic_t sctp_dbg_objcnt_chunk; 273 extern atomic_t sctp_dbg_objcnt_bind_addr; 274 extern atomic_t sctp_dbg_objcnt_bind_bucket; 275 extern atomic_t sctp_dbg_objcnt_addr; 276 extern atomic_t sctp_dbg_objcnt_ssnmap; 277 extern atomic_t sctp_dbg_objcnt_datamsg; 278 extern atomic_t sctp_dbg_objcnt_keys; 279 280 /* Macros to atomically increment/decrement objcnt counters. */ 281 #define SCTP_DBG_OBJCNT_INC(name) \ 282 atomic_inc(&sctp_dbg_objcnt_## name) 283 #define SCTP_DBG_OBJCNT_DEC(name) \ 284 atomic_dec(&sctp_dbg_objcnt_## name) 285 #define SCTP_DBG_OBJCNT(name) \ 286 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 287 288 /* Macro to help create new entries in in the global array of 289 * objcnt counters. 290 */ 291 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 292 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 293 294 void sctp_dbg_objcnt_init(struct net *); 295 void sctp_dbg_objcnt_exit(struct net *); 296 297 #else 298 299 #define SCTP_DBG_OBJCNT_INC(name) 300 #define SCTP_DBG_OBJCNT_DEC(name) 301 302 static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 303 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 304 305 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 306 307 #if defined CONFIG_SYSCTL 308 void sctp_sysctl_register(void); 309 void sctp_sysctl_unregister(void); 310 int sctp_sysctl_net_register(struct net *net); 311 void sctp_sysctl_net_unregister(struct net *net); 312 #else 313 static inline void sctp_sysctl_register(void) { return; } 314 static inline void sctp_sysctl_unregister(void) { return; } 315 static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 316 static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 317 #endif 318 319 /* Size of Supported Address Parameter for 'x' address types. */ 320 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 321 322 #if IS_ENABLED(CONFIG_IPV6) 323 324 void sctp_v6_pf_init(void); 325 void sctp_v6_pf_exit(void); 326 int sctp_v6_protosw_init(void); 327 void sctp_v6_protosw_exit(void); 328 int sctp_v6_add_protocol(void); 329 void sctp_v6_del_protocol(void); 330 331 #else /* #ifdef defined(CONFIG_IPV6) */ 332 333 static inline void sctp_v6_pf_init(void) { return; } 334 static inline void sctp_v6_pf_exit(void) { return; } 335 static inline int sctp_v6_protosw_init(void) { return 0; } 336 static inline void sctp_v6_protosw_exit(void) { return; } 337 static inline int sctp_v6_add_protocol(void) { return 0; } 338 static inline void sctp_v6_del_protocol(void) { return; } 339 340 #endif /* #if defined(CONFIG_IPV6) */ 341 342 343 /* Map an association to an assoc_id. */ 344 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 345 { 346 return asoc ? asoc->assoc_id : 0; 347 } 348 349 /* Look up the association by its id. */ 350 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 351 352 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 353 354 /* A macro to walk a list of skbs. */ 355 #define sctp_skb_for_each(pos, head, tmp) \ 356 skb_queue_walk_safe(head, pos, tmp) 357 358 /* A helper to append an entire skb list (list) to another (head). */ 359 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 360 struct sk_buff_head *head) 361 { 362 unsigned long flags; 363 364 sctp_spin_lock_irqsave(&head->lock, flags); 365 sctp_spin_lock(&list->lock); 366 367 skb_queue_splice_tail_init(list, head); 368 369 sctp_spin_unlock(&list->lock); 370 sctp_spin_unlock_irqrestore(&head->lock, flags); 371 } 372 373 /** 374 * sctp_list_dequeue - remove from the head of the queue 375 * @list: list to dequeue from 376 * 377 * Remove the head of the list. The head item is 378 * returned or %NULL if the list is empty. 379 */ 380 381 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 382 { 383 struct list_head *result = NULL; 384 385 if (list->next != list) { 386 result = list->next; 387 list->next = result->next; 388 list->next->prev = list; 389 INIT_LIST_HEAD(result); 390 } 391 return result; 392 } 393 394 /* SCTP version of skb_set_owner_r. We need this one because 395 * of the way we have to do receive buffer accounting on bundled 396 * chunks. 397 */ 398 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 399 { 400 struct sctp_ulpevent *event = sctp_skb2event(skb); 401 402 skb_orphan(skb); 403 skb->sk = sk; 404 skb->destructor = sctp_sock_rfree; 405 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 406 /* 407 * This mimics the behavior of skb_set_owner_r 408 */ 409 sk->sk_forward_alloc -= event->rmem_len; 410 } 411 412 /* Tests if the list has one and only one entry. */ 413 static inline int sctp_list_single_entry(struct list_head *head) 414 { 415 return (head->next != head) && (head->next == head->prev); 416 } 417 418 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 419 static inline __s32 sctp_jitter(__u32 rto) 420 { 421 static __u32 sctp_rand; 422 __s32 ret; 423 424 /* Avoid divide by zero. */ 425 if (!rto) 426 rto = 1; 427 428 sctp_rand += jiffies; 429 sctp_rand ^= (sctp_rand << 12); 430 sctp_rand ^= (sctp_rand >> 20); 431 432 /* Choose random number from 0 to rto, then move to -50% ~ +50% 433 * of rto. 434 */ 435 ret = sctp_rand % rto - (rto >> 1); 436 return ret; 437 } 438 439 /* Break down data chunks at this point. */ 440 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 441 { 442 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 443 int frag = pmtu; 444 445 frag -= sp->pf->af->net_header_len; 446 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 447 448 if (asoc->user_frag) 449 frag = min_t(int, frag, asoc->user_frag); 450 451 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 452 453 return frag; 454 } 455 456 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) 457 { 458 459 sctp_assoc_sync_pmtu(sk, asoc); 460 asoc->pmtu_pending = 0; 461 } 462 463 /* Walk through a list of TLV parameters. Don't trust the 464 * individual parameter lengths and instead depend on 465 * the chunk length to indicate when to stop. Make sure 466 * there is room for a param header too. 467 */ 468 #define sctp_walk_params(pos, chunk, member)\ 469 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 470 471 #define _sctp_walk_params(pos, chunk, end, member)\ 472 for (pos.v = chunk->member;\ 473 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 474 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 475 pos.v += WORD_ROUND(ntohs(pos.p->length))) 476 477 #define sctp_walk_errors(err, chunk_hdr)\ 478 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 479 480 #define _sctp_walk_errors(err, chunk_hdr, end)\ 481 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 482 sizeof(sctp_chunkhdr_t));\ 483 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 484 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 485 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 486 487 #define sctp_walk_fwdtsn(pos, chunk)\ 488 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 489 490 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 491 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 492 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 493 pos++) 494 495 /* Round an int up to the next multiple of 4. */ 496 #define WORD_ROUND(s) (((s)+3)&~3) 497 498 /* External references. */ 499 500 extern struct proto sctp_prot; 501 extern struct proto sctpv6_prot; 502 void sctp_put_port(struct sock *sk); 503 504 extern struct idr sctp_assocs_id; 505 extern spinlock_t sctp_assocs_id_lock; 506 507 /* Static inline functions. */ 508 509 /* Convert from an IP version number to an Address Family symbol. */ 510 static inline int ipver2af(__u8 ipver) 511 { 512 switch (ipver) { 513 case 4: 514 return AF_INET; 515 case 6: 516 return AF_INET6; 517 default: 518 return 0; 519 } 520 } 521 522 /* Convert from an address parameter type to an address family. */ 523 static inline int param_type2af(__be16 type) 524 { 525 switch (type) { 526 case SCTP_PARAM_IPV4_ADDRESS: 527 return AF_INET; 528 case SCTP_PARAM_IPV6_ADDRESS: 529 return AF_INET6; 530 default: 531 return 0; 532 } 533 } 534 535 /* Warning: The following hash functions assume a power of two 'size'. */ 536 /* This is the hash function for the SCTP port hash table. */ 537 static inline int sctp_phashfn(struct net *net, __u16 lport) 538 { 539 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 540 } 541 542 /* This is the hash function for the endpoint hash table. */ 543 static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 544 { 545 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 546 } 547 548 /* This is the hash function for the association hash table. */ 549 static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport) 550 { 551 int h = (lport << 16) + rport + net_hash_mix(net); 552 h ^= h>>8; 553 return h & (sctp_assoc_hashsize - 1); 554 } 555 556 /* This is the hash function for the association hash table. This is 557 * not used yet, but could be used as a better hash function when 558 * we have a vtag. 559 */ 560 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 561 { 562 int h = (lport << 16) + rport; 563 h ^= vtag; 564 return h & (sctp_assoc_hashsize - 1); 565 } 566 567 #define sctp_for_each_hentry(epb, head) \ 568 hlist_for_each_entry(epb, head, node) 569 570 /* Is a socket of this style? */ 571 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 572 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 573 { 574 return sctp_sk(sk)->type == style; 575 } 576 577 /* Is the association in this state? */ 578 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 579 static inline int __sctp_state(const struct sctp_association *asoc, 580 sctp_state_t state) 581 { 582 return asoc->state == state; 583 } 584 585 /* Is the socket in this state? */ 586 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 587 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 588 { 589 return sk->sk_state == state; 590 } 591 592 /* Map v4-mapped v6 address back to v4 address */ 593 static inline void sctp_v6_map_v4(union sctp_addr *addr) 594 { 595 addr->v4.sin_family = AF_INET; 596 addr->v4.sin_port = addr->v6.sin6_port; 597 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 598 } 599 600 /* Map v4 address to v4-mapped v6 address */ 601 static inline void sctp_v4_map_v6(union sctp_addr *addr) 602 { 603 addr->v6.sin6_family = AF_INET6; 604 addr->v6.sin6_port = addr->v4.sin_port; 605 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 606 addr->v6.sin6_addr.s6_addr32[0] = 0; 607 addr->v6.sin6_addr.s6_addr32[1] = 0; 608 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 609 } 610 611 /* The cookie is always 0 since this is how it's used in the 612 * pmtu code. 613 */ 614 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 615 { 616 if (t->dst && !dst_check(t->dst, 0)) { 617 dst_release(t->dst); 618 t->dst = NULL; 619 } 620 621 return t->dst; 622 } 623 624 #endif /* __net_sctp_h__ */ 625