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 /* Round an int up to the next multiple of 4. */ 86 #define WORD_ROUND(s) (((s)+3)&~3) 87 /* Truncate to the previous multiple of 4. */ 88 #define WORD_TRUNC(s) ((s)&~3) 89 90 /* 91 * Function declarations. 92 */ 93 94 /* 95 * sctp/protocol.c 96 */ 97 int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, 98 sctp_scope_t, gfp_t gfp, int flags); 99 struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 100 int sctp_register_pf(struct sctp_pf *, sa_family_t); 101 void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); 102 103 /* 104 * sctp/socket.c 105 */ 106 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 107 int sctp_inet_listen(struct socket *sock, int backlog); 108 void sctp_write_space(struct sock *sk); 109 void sctp_data_ready(struct sock *sk); 110 unsigned int sctp_poll(struct file *file, struct socket *sock, 111 poll_table *wait); 112 void sctp_sock_rfree(struct sk_buff *skb); 113 void sctp_copy_sock(struct sock *newsk, struct sock *sk, 114 struct sctp_association *asoc); 115 extern struct percpu_counter sctp_sockets_allocated; 116 int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 117 struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); 118 119 int sctp_transport_walk_start(struct rhashtable_iter *iter); 120 void sctp_transport_walk_stop(struct rhashtable_iter *iter); 121 struct sctp_transport *sctp_transport_get_next(struct net *net, 122 struct rhashtable_iter *iter); 123 struct sctp_transport *sctp_transport_get_idx(struct net *net, 124 struct rhashtable_iter *iter, int pos); 125 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *), 126 struct net *net, 127 const union sctp_addr *laddr, 128 const union sctp_addr *paddr, void *p); 129 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *), 130 struct net *net, int pos, void *p); 131 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p); 132 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc, 133 struct sctp_info *info); 134 135 /* 136 * sctp/primitive.c 137 */ 138 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 139 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 140 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 141 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 142 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 143 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); 144 145 /* 146 * sctp/input.c 147 */ 148 int sctp_rcv(struct sk_buff *skb); 149 void sctp_v4_err(struct sk_buff *skb, u32 info); 150 void sctp_hash_endpoint(struct sctp_endpoint *); 151 void sctp_unhash_endpoint(struct sctp_endpoint *); 152 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, 153 struct sctphdr *, struct sctp_association **, 154 struct sctp_transport **); 155 void sctp_err_finish(struct sock *, struct sctp_association *); 156 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 157 struct sctp_transport *t, __u32 pmtu); 158 void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 159 struct sk_buff *); 160 void sctp_icmp_proto_unreachable(struct sock *sk, 161 struct sctp_association *asoc, 162 struct sctp_transport *t); 163 void sctp_backlog_migrate(struct sctp_association *assoc, 164 struct sock *oldsk, struct sock *newsk); 165 int sctp_transport_hashtable_init(void); 166 void sctp_transport_hashtable_destroy(void); 167 void sctp_hash_transport(struct sctp_transport *t); 168 void sctp_unhash_transport(struct sctp_transport *t); 169 struct sctp_transport *sctp_addrs_lookup_transport( 170 struct net *net, 171 const union sctp_addr *laddr, 172 const union sctp_addr *paddr); 173 struct sctp_transport *sctp_epaddr_lookup_transport( 174 const struct sctp_endpoint *ep, 175 const union sctp_addr *paddr); 176 177 /* 178 * sctp/proc.c 179 */ 180 int sctp_snmp_proc_init(struct net *net); 181 void sctp_snmp_proc_exit(struct net *net); 182 int sctp_eps_proc_init(struct net *net); 183 void sctp_eps_proc_exit(struct net *net); 184 int sctp_assocs_proc_init(struct net *net); 185 void sctp_assocs_proc_exit(struct net *net); 186 int sctp_remaddr_proc_init(struct net *net); 187 void sctp_remaddr_proc_exit(struct net *net); 188 189 190 /* 191 * Module global variables 192 */ 193 194 /* 195 * sctp/protocol.c 196 */ 197 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 198 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 199 extern long sysctl_sctp_mem[3]; 200 extern int sysctl_sctp_rmem[3]; 201 extern int sysctl_sctp_wmem[3]; 202 203 /* 204 * Section: Macros, externs, and inlines 205 */ 206 207 /* SCTP SNMP MIB stats handlers */ 208 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 209 #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) 210 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) 211 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 212 213 /* sctp mib definitions */ 214 enum { 215 SCTP_MIB_NUM = 0, 216 SCTP_MIB_CURRESTAB, /* CurrEstab */ 217 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 218 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 219 SCTP_MIB_ABORTEDS, /* Aborteds */ 220 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 221 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 222 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 223 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 224 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 225 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 226 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 227 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 228 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 229 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 230 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 231 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 232 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 233 SCTP_MIB_T1_INIT_EXPIREDS, 234 SCTP_MIB_T1_COOKIE_EXPIREDS, 235 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 236 SCTP_MIB_T3_RTX_EXPIREDS, 237 SCTP_MIB_T4_RTO_EXPIREDS, 238 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 239 SCTP_MIB_DELAY_SACK_EXPIREDS, 240 SCTP_MIB_AUTOCLOSE_EXPIREDS, 241 SCTP_MIB_T1_RETRANSMITS, 242 SCTP_MIB_T3_RETRANSMITS, 243 SCTP_MIB_PMTUD_RETRANSMITS, 244 SCTP_MIB_FAST_RETRANSMITS, 245 SCTP_MIB_IN_PKT_SOFTIRQ, 246 SCTP_MIB_IN_PKT_BACKLOG, 247 SCTP_MIB_IN_PKT_DISCARDS, 248 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 249 __SCTP_MIB_MAX 250 }; 251 252 #define SCTP_MIB_MAX __SCTP_MIB_MAX 253 struct sctp_mib { 254 unsigned long mibs[SCTP_MIB_MAX]; 255 }; 256 257 /* helper function to track stats about max rto and related transport */ 258 static inline void sctp_max_rto(struct sctp_association *asoc, 259 struct sctp_transport *trans) 260 { 261 if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 262 asoc->stats.max_obs_rto = trans->rto; 263 memset(&asoc->stats.obs_rto_ipaddr, 0, 264 sizeof(struct sockaddr_storage)); 265 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 266 trans->af_specific->sockaddr_len); 267 } 268 } 269 270 /* 271 * Macros for keeping a global reference of object allocations. 272 */ 273 #ifdef CONFIG_SCTP_DBG_OBJCNT 274 275 extern atomic_t sctp_dbg_objcnt_sock; 276 extern atomic_t sctp_dbg_objcnt_ep; 277 extern atomic_t sctp_dbg_objcnt_assoc; 278 extern atomic_t sctp_dbg_objcnt_transport; 279 extern atomic_t sctp_dbg_objcnt_chunk; 280 extern atomic_t sctp_dbg_objcnt_bind_addr; 281 extern atomic_t sctp_dbg_objcnt_bind_bucket; 282 extern atomic_t sctp_dbg_objcnt_addr; 283 extern atomic_t sctp_dbg_objcnt_ssnmap; 284 extern atomic_t sctp_dbg_objcnt_datamsg; 285 extern atomic_t sctp_dbg_objcnt_keys; 286 287 /* Macros to atomically increment/decrement objcnt counters. */ 288 #define SCTP_DBG_OBJCNT_INC(name) \ 289 atomic_inc(&sctp_dbg_objcnt_## name) 290 #define SCTP_DBG_OBJCNT_DEC(name) \ 291 atomic_dec(&sctp_dbg_objcnt_## name) 292 #define SCTP_DBG_OBJCNT(name) \ 293 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 294 295 /* Macro to help create new entries in in the global array of 296 * objcnt counters. 297 */ 298 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 299 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 300 301 void sctp_dbg_objcnt_init(struct net *); 302 void sctp_dbg_objcnt_exit(struct net *); 303 304 #else 305 306 #define SCTP_DBG_OBJCNT_INC(name) 307 #define SCTP_DBG_OBJCNT_DEC(name) 308 309 static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 310 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 311 312 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 313 314 #if defined CONFIG_SYSCTL 315 void sctp_sysctl_register(void); 316 void sctp_sysctl_unregister(void); 317 int sctp_sysctl_net_register(struct net *net); 318 void sctp_sysctl_net_unregister(struct net *net); 319 #else 320 static inline void sctp_sysctl_register(void) { return; } 321 static inline void sctp_sysctl_unregister(void) { return; } 322 static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 323 static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 324 #endif 325 326 /* Size of Supported Address Parameter for 'x' address types. */ 327 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 328 329 #if IS_ENABLED(CONFIG_IPV6) 330 331 void sctp_v6_pf_init(void); 332 void sctp_v6_pf_exit(void); 333 int sctp_v6_protosw_init(void); 334 void sctp_v6_protosw_exit(void); 335 int sctp_v6_add_protocol(void); 336 void sctp_v6_del_protocol(void); 337 338 #else /* #ifdef defined(CONFIG_IPV6) */ 339 340 static inline void sctp_v6_pf_init(void) { return; } 341 static inline void sctp_v6_pf_exit(void) { return; } 342 static inline int sctp_v6_protosw_init(void) { return 0; } 343 static inline void sctp_v6_protosw_exit(void) { return; } 344 static inline int sctp_v6_add_protocol(void) { return 0; } 345 static inline void sctp_v6_del_protocol(void) { return; } 346 347 #endif /* #if defined(CONFIG_IPV6) */ 348 349 350 /* Map an association to an assoc_id. */ 351 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 352 { 353 return asoc ? asoc->assoc_id : 0; 354 } 355 356 static inline enum sctp_sstat_state 357 sctp_assoc_to_state(const struct sctp_association *asoc) 358 { 359 /* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we 360 * got rid of it in kernel space. Therefore SCTP_CLOSED et al 361 * start at =1 in user space, but actually as =0 in kernel space. 362 * Now that we can not break user space and SCTP_EMPTY is exposed 363 * there, we need to fix it up with an ugly offset not to break 364 * applications. :( 365 */ 366 return asoc->state + 1; 367 } 368 369 /* Look up the association by its id. */ 370 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 371 372 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 373 374 /* A macro to walk a list of skbs. */ 375 #define sctp_skb_for_each(pos, head, tmp) \ 376 skb_queue_walk_safe(head, pos, tmp) 377 378 /** 379 * sctp_list_dequeue - remove from the head of the queue 380 * @list: list to dequeue from 381 * 382 * Remove the head of the list. The head item is 383 * returned or %NULL if the list is empty. 384 */ 385 386 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 387 { 388 struct list_head *result = NULL; 389 390 if (!list_empty(list)) { 391 result = list->next; 392 list_del_init(result); 393 } 394 return result; 395 } 396 397 /* SCTP version of skb_set_owner_r. We need this one because 398 * of the way we have to do receive buffer accounting on bundled 399 * chunks. 400 */ 401 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 402 { 403 struct sctp_ulpevent *event = sctp_skb2event(skb); 404 405 skb_orphan(skb); 406 skb->sk = sk; 407 skb->destructor = sctp_sock_rfree; 408 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 409 /* 410 * This mimics the behavior of skb_set_owner_r 411 */ 412 sk->sk_forward_alloc -= event->rmem_len; 413 } 414 415 /* Tests if the list has one and only one entry. */ 416 static inline int sctp_list_single_entry(struct list_head *head) 417 { 418 return (head->next != head) && (head->next == head->prev); 419 } 420 421 /* Break down data chunks at this point. */ 422 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 423 { 424 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 425 int frag = pmtu; 426 427 frag -= sp->pf->af->net_header_len; 428 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 429 430 if (asoc->user_frag) 431 frag = min_t(int, frag, asoc->user_frag); 432 433 frag = WORD_TRUNC(min_t(int, frag, SCTP_MAX_CHUNK_LEN)); 434 435 return frag; 436 } 437 438 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) 439 { 440 441 sctp_assoc_sync_pmtu(sk, asoc); 442 asoc->pmtu_pending = 0; 443 } 444 445 static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) 446 { 447 return !list_empty(&chunk->list); 448 } 449 450 /* Walk through a list of TLV parameters. Don't trust the 451 * individual parameter lengths and instead depend on 452 * the chunk length to indicate when to stop. Make sure 453 * there is room for a param header too. 454 */ 455 #define sctp_walk_params(pos, chunk, member)\ 456 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 457 458 #define _sctp_walk_params(pos, chunk, end, member)\ 459 for (pos.v = chunk->member;\ 460 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 461 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 462 pos.v += WORD_ROUND(ntohs(pos.p->length))) 463 464 #define sctp_walk_errors(err, chunk_hdr)\ 465 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 466 467 #define _sctp_walk_errors(err, chunk_hdr, end)\ 468 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 469 sizeof(sctp_chunkhdr_t));\ 470 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 471 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 472 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 473 474 #define sctp_walk_fwdtsn(pos, chunk)\ 475 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 476 477 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 478 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 479 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 480 pos++) 481 482 /* External references. */ 483 484 extern struct proto sctp_prot; 485 extern struct proto sctpv6_prot; 486 void sctp_put_port(struct sock *sk); 487 488 extern struct idr sctp_assocs_id; 489 extern spinlock_t sctp_assocs_id_lock; 490 491 /* Static inline functions. */ 492 493 /* Convert from an IP version number to an Address Family symbol. */ 494 static inline int ipver2af(__u8 ipver) 495 { 496 switch (ipver) { 497 case 4: 498 return AF_INET; 499 case 6: 500 return AF_INET6; 501 default: 502 return 0; 503 } 504 } 505 506 /* Convert from an address parameter type to an address family. */ 507 static inline int param_type2af(__be16 type) 508 { 509 switch (type) { 510 case SCTP_PARAM_IPV4_ADDRESS: 511 return AF_INET; 512 case SCTP_PARAM_IPV6_ADDRESS: 513 return AF_INET6; 514 default: 515 return 0; 516 } 517 } 518 519 /* Warning: The following hash functions assume a power of two 'size'. */ 520 /* This is the hash function for the SCTP port hash table. */ 521 static inline int sctp_phashfn(struct net *net, __u16 lport) 522 { 523 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 524 } 525 526 /* This is the hash function for the endpoint hash table. */ 527 static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 528 { 529 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 530 } 531 532 #define sctp_for_each_hentry(epb, head) \ 533 hlist_for_each_entry(epb, head, node) 534 535 /* Is a socket of this style? */ 536 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 537 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 538 { 539 return sctp_sk(sk)->type == style; 540 } 541 542 /* Is the association in this state? */ 543 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 544 static inline int __sctp_state(const struct sctp_association *asoc, 545 sctp_state_t state) 546 { 547 return asoc->state == state; 548 } 549 550 /* Is the socket in this state? */ 551 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 552 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 553 { 554 return sk->sk_state == state; 555 } 556 557 /* Map v4-mapped v6 address back to v4 address */ 558 static inline void sctp_v6_map_v4(union sctp_addr *addr) 559 { 560 addr->v4.sin_family = AF_INET; 561 addr->v4.sin_port = addr->v6.sin6_port; 562 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 563 } 564 565 /* Map v4 address to v4-mapped v6 address */ 566 static inline void sctp_v4_map_v6(union sctp_addr *addr) 567 { 568 __be16 port; 569 570 port = addr->v4.sin_port; 571 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 572 addr->v6.sin6_port = port; 573 addr->v6.sin6_family = AF_INET6; 574 addr->v6.sin6_flowinfo = 0; 575 addr->v6.sin6_scope_id = 0; 576 addr->v6.sin6_addr.s6_addr32[0] = 0; 577 addr->v6.sin6_addr.s6_addr32[1] = 0; 578 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 579 } 580 581 /* The cookie is always 0 since this is how it's used in the 582 * pmtu code. 583 */ 584 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 585 { 586 if (t->dst && !dst_check(t->dst, t->dst_cookie)) { 587 dst_release(t->dst); 588 t->dst = NULL; 589 } 590 591 return t->dst; 592 } 593 594 #endif /* __net_sctp_h__ */ 595