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