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 /* 120 * sctp/primitive.c 121 */ 122 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 123 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 124 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 125 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 126 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 127 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); 128 129 /* 130 * sctp/input.c 131 */ 132 int sctp_rcv(struct sk_buff *skb); 133 void sctp_v4_err(struct sk_buff *skb, u32 info); 134 void sctp_hash_endpoint(struct sctp_endpoint *); 135 void sctp_unhash_endpoint(struct sctp_endpoint *); 136 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, 137 struct sctphdr *, struct sctp_association **, 138 struct sctp_transport **); 139 void sctp_err_finish(struct sock *, struct sctp_association *); 140 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 141 struct sctp_transport *t, __u32 pmtu); 142 void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 143 struct sk_buff *); 144 void sctp_icmp_proto_unreachable(struct sock *sk, 145 struct sctp_association *asoc, 146 struct sctp_transport *t); 147 void sctp_backlog_migrate(struct sctp_association *assoc, 148 struct sock *oldsk, struct sock *newsk); 149 int sctp_transport_hashtable_init(void); 150 void sctp_transport_hashtable_destroy(void); 151 void sctp_hash_transport(struct sctp_transport *t); 152 void sctp_unhash_transport(struct sctp_transport *t); 153 struct sctp_transport *sctp_addrs_lookup_transport( 154 struct net *net, 155 const union sctp_addr *laddr, 156 const union sctp_addr *paddr); 157 struct sctp_transport *sctp_epaddr_lookup_transport( 158 const struct sctp_endpoint *ep, 159 const union sctp_addr *paddr); 160 161 /* 162 * sctp/proc.c 163 */ 164 int sctp_snmp_proc_init(struct net *net); 165 void sctp_snmp_proc_exit(struct net *net); 166 int sctp_eps_proc_init(struct net *net); 167 void sctp_eps_proc_exit(struct net *net); 168 int sctp_assocs_proc_init(struct net *net); 169 void sctp_assocs_proc_exit(struct net *net); 170 int sctp_remaddr_proc_init(struct net *net); 171 void sctp_remaddr_proc_exit(struct net *net); 172 173 174 /* 175 * Module global variables 176 */ 177 178 /* 179 * sctp/protocol.c 180 */ 181 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 182 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 183 extern long sysctl_sctp_mem[3]; 184 extern int sysctl_sctp_rmem[3]; 185 extern int sysctl_sctp_wmem[3]; 186 187 /* 188 * Section: Macros, externs, and inlines 189 */ 190 191 /* SCTP SNMP MIB stats handlers */ 192 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 193 #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) 194 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) 195 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 196 197 /* sctp mib definitions */ 198 enum { 199 SCTP_MIB_NUM = 0, 200 SCTP_MIB_CURRESTAB, /* CurrEstab */ 201 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 202 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 203 SCTP_MIB_ABORTEDS, /* Aborteds */ 204 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 205 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 206 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 207 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 208 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 209 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 210 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 211 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 212 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 213 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 214 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 215 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 216 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 217 SCTP_MIB_T1_INIT_EXPIREDS, 218 SCTP_MIB_T1_COOKIE_EXPIREDS, 219 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 220 SCTP_MIB_T3_RTX_EXPIREDS, 221 SCTP_MIB_T4_RTO_EXPIREDS, 222 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 223 SCTP_MIB_DELAY_SACK_EXPIREDS, 224 SCTP_MIB_AUTOCLOSE_EXPIREDS, 225 SCTP_MIB_T1_RETRANSMITS, 226 SCTP_MIB_T3_RETRANSMITS, 227 SCTP_MIB_PMTUD_RETRANSMITS, 228 SCTP_MIB_FAST_RETRANSMITS, 229 SCTP_MIB_IN_PKT_SOFTIRQ, 230 SCTP_MIB_IN_PKT_BACKLOG, 231 SCTP_MIB_IN_PKT_DISCARDS, 232 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 233 __SCTP_MIB_MAX 234 }; 235 236 #define SCTP_MIB_MAX __SCTP_MIB_MAX 237 struct sctp_mib { 238 unsigned long mibs[SCTP_MIB_MAX]; 239 }; 240 241 /* helper function to track stats about max rto and related transport */ 242 static inline void sctp_max_rto(struct sctp_association *asoc, 243 struct sctp_transport *trans) 244 { 245 if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 246 asoc->stats.max_obs_rto = trans->rto; 247 memset(&asoc->stats.obs_rto_ipaddr, 0, 248 sizeof(struct sockaddr_storage)); 249 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 250 trans->af_specific->sockaddr_len); 251 } 252 } 253 254 /* 255 * Macros for keeping a global reference of object allocations. 256 */ 257 #ifdef CONFIG_SCTP_DBG_OBJCNT 258 259 extern atomic_t sctp_dbg_objcnt_sock; 260 extern atomic_t sctp_dbg_objcnt_ep; 261 extern atomic_t sctp_dbg_objcnt_assoc; 262 extern atomic_t sctp_dbg_objcnt_transport; 263 extern atomic_t sctp_dbg_objcnt_chunk; 264 extern atomic_t sctp_dbg_objcnt_bind_addr; 265 extern atomic_t sctp_dbg_objcnt_bind_bucket; 266 extern atomic_t sctp_dbg_objcnt_addr; 267 extern atomic_t sctp_dbg_objcnt_ssnmap; 268 extern atomic_t sctp_dbg_objcnt_datamsg; 269 extern atomic_t sctp_dbg_objcnt_keys; 270 271 /* Macros to atomically increment/decrement objcnt counters. */ 272 #define SCTP_DBG_OBJCNT_INC(name) \ 273 atomic_inc(&sctp_dbg_objcnt_## name) 274 #define SCTP_DBG_OBJCNT_DEC(name) \ 275 atomic_dec(&sctp_dbg_objcnt_## name) 276 #define SCTP_DBG_OBJCNT(name) \ 277 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 278 279 /* Macro to help create new entries in in the global array of 280 * objcnt counters. 281 */ 282 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 283 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 284 285 void sctp_dbg_objcnt_init(struct net *); 286 void sctp_dbg_objcnt_exit(struct net *); 287 288 #else 289 290 #define SCTP_DBG_OBJCNT_INC(name) 291 #define SCTP_DBG_OBJCNT_DEC(name) 292 293 static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 294 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 295 296 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 297 298 #if defined CONFIG_SYSCTL 299 void sctp_sysctl_register(void); 300 void sctp_sysctl_unregister(void); 301 int sctp_sysctl_net_register(struct net *net); 302 void sctp_sysctl_net_unregister(struct net *net); 303 #else 304 static inline void sctp_sysctl_register(void) { return; } 305 static inline void sctp_sysctl_unregister(void) { return; } 306 static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 307 static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 308 #endif 309 310 /* Size of Supported Address Parameter for 'x' address types. */ 311 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 312 313 #if IS_ENABLED(CONFIG_IPV6) 314 315 void sctp_v6_pf_init(void); 316 void sctp_v6_pf_exit(void); 317 int sctp_v6_protosw_init(void); 318 void sctp_v6_protosw_exit(void); 319 int sctp_v6_add_protocol(void); 320 void sctp_v6_del_protocol(void); 321 322 #else /* #ifdef defined(CONFIG_IPV6) */ 323 324 static inline void sctp_v6_pf_init(void) { return; } 325 static inline void sctp_v6_pf_exit(void) { return; } 326 static inline int sctp_v6_protosw_init(void) { return 0; } 327 static inline void sctp_v6_protosw_exit(void) { return; } 328 static inline int sctp_v6_add_protocol(void) { return 0; } 329 static inline void sctp_v6_del_protocol(void) { return; } 330 331 #endif /* #if defined(CONFIG_IPV6) */ 332 333 334 /* Map an association to an assoc_id. */ 335 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 336 { 337 return asoc ? asoc->assoc_id : 0; 338 } 339 340 static inline enum sctp_sstat_state 341 sctp_assoc_to_state(const struct sctp_association *asoc) 342 { 343 /* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we 344 * got rid of it in kernel space. Therefore SCTP_CLOSED et al 345 * start at =1 in user space, but actually as =0 in kernel space. 346 * Now that we can not break user space and SCTP_EMPTY is exposed 347 * there, we need to fix it up with an ugly offset not to break 348 * applications. :( 349 */ 350 return asoc->state + 1; 351 } 352 353 /* Look up the association by its id. */ 354 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 355 356 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 357 358 /* A macro to walk a list of skbs. */ 359 #define sctp_skb_for_each(pos, head, tmp) \ 360 skb_queue_walk_safe(head, pos, tmp) 361 362 /* A helper to append an entire skb list (list) to another (head). */ 363 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 364 struct sk_buff_head *head) 365 { 366 unsigned long flags; 367 368 spin_lock_irqsave(&head->lock, flags); 369 spin_lock(&list->lock); 370 371 skb_queue_splice_tail_init(list, head); 372 373 spin_unlock(&list->lock); 374 spin_unlock_irqrestore(&head->lock, flags); 375 } 376 377 /** 378 * sctp_list_dequeue - remove from the head of the queue 379 * @list: list to dequeue from 380 * 381 * Remove the head of the list. The head item is 382 * returned or %NULL if the list is empty. 383 */ 384 385 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 386 { 387 struct list_head *result = NULL; 388 389 if (list->next != list) { 390 result = list->next; 391 list->next = result->next; 392 list->next->prev = list; 393 INIT_LIST_HEAD(result); 394 } 395 return result; 396 } 397 398 /* SCTP version of skb_set_owner_r. We need this one because 399 * of the way we have to do receive buffer accounting on bundled 400 * chunks. 401 */ 402 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 403 { 404 struct sctp_ulpevent *event = sctp_skb2event(skb); 405 406 skb_orphan(skb); 407 skb->sk = sk; 408 skb->destructor = sctp_sock_rfree; 409 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 410 /* 411 * This mimics the behavior of skb_set_owner_r 412 */ 413 sk->sk_forward_alloc -= event->rmem_len; 414 } 415 416 /* Tests if the list has one and only one entry. */ 417 static inline int sctp_list_single_entry(struct list_head *head) 418 { 419 return (head->next != head) && (head->next == head->prev); 420 } 421 422 /* Break down data chunks at this point. */ 423 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 424 { 425 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 426 int frag = pmtu; 427 428 frag -= sp->pf->af->net_header_len; 429 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 430 431 if (asoc->user_frag) 432 frag = min_t(int, frag, asoc->user_frag); 433 434 frag = WORD_TRUNC(min_t(int, frag, SCTP_MAX_CHUNK_LEN)); 435 436 return frag; 437 } 438 439 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) 440 { 441 442 sctp_assoc_sync_pmtu(sk, asoc); 443 asoc->pmtu_pending = 0; 444 } 445 446 static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) 447 { 448 return !list_empty(&chunk->list); 449 } 450 451 /* Walk through a list of TLV parameters. Don't trust the 452 * individual parameter lengths and instead depend on 453 * the chunk length to indicate when to stop. Make sure 454 * there is room for a param header too. 455 */ 456 #define sctp_walk_params(pos, chunk, member)\ 457 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 458 459 #define _sctp_walk_params(pos, chunk, end, member)\ 460 for (pos.v = chunk->member;\ 461 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 462 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 463 pos.v += WORD_ROUND(ntohs(pos.p->length))) 464 465 #define sctp_walk_errors(err, chunk_hdr)\ 466 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 467 468 #define _sctp_walk_errors(err, chunk_hdr, end)\ 469 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 470 sizeof(sctp_chunkhdr_t));\ 471 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 472 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 473 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 474 475 #define sctp_walk_fwdtsn(pos, chunk)\ 476 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 477 478 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 479 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 480 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 481 pos++) 482 483 /* External references. */ 484 485 extern struct proto sctp_prot; 486 extern struct proto sctpv6_prot; 487 void sctp_put_port(struct sock *sk); 488 489 extern struct idr sctp_assocs_id; 490 extern spinlock_t sctp_assocs_id_lock; 491 492 /* Static inline functions. */ 493 494 /* Convert from an IP version number to an Address Family symbol. */ 495 static inline int ipver2af(__u8 ipver) 496 { 497 switch (ipver) { 498 case 4: 499 return AF_INET; 500 case 6: 501 return AF_INET6; 502 default: 503 return 0; 504 } 505 } 506 507 /* Convert from an address parameter type to an address family. */ 508 static inline int param_type2af(__be16 type) 509 { 510 switch (type) { 511 case SCTP_PARAM_IPV4_ADDRESS: 512 return AF_INET; 513 case SCTP_PARAM_IPV6_ADDRESS: 514 return AF_INET6; 515 default: 516 return 0; 517 } 518 } 519 520 /* Warning: The following hash functions assume a power of two 'size'. */ 521 /* This is the hash function for the SCTP port hash table. */ 522 static inline int sctp_phashfn(struct net *net, __u16 lport) 523 { 524 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 525 } 526 527 /* This is the hash function for the endpoint hash table. */ 528 static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 529 { 530 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 531 } 532 533 #define sctp_for_each_hentry(epb, head) \ 534 hlist_for_each_entry(epb, head, node) 535 536 /* Is a socket of this style? */ 537 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 538 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 539 { 540 return sctp_sk(sk)->type == style; 541 } 542 543 /* Is the association in this state? */ 544 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 545 static inline int __sctp_state(const struct sctp_association *asoc, 546 sctp_state_t state) 547 { 548 return asoc->state == state; 549 } 550 551 /* Is the socket in this state? */ 552 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 553 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 554 { 555 return sk->sk_state == state; 556 } 557 558 /* Map v4-mapped v6 address back to v4 address */ 559 static inline void sctp_v6_map_v4(union sctp_addr *addr) 560 { 561 addr->v4.sin_family = AF_INET; 562 addr->v4.sin_port = addr->v6.sin6_port; 563 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 564 } 565 566 /* Map v4 address to v4-mapped v6 address */ 567 static inline void sctp_v4_map_v6(union sctp_addr *addr) 568 { 569 __be16 port; 570 571 port = addr->v4.sin_port; 572 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 573 addr->v6.sin6_port = port; 574 addr->v6.sin6_family = AF_INET6; 575 addr->v6.sin6_flowinfo = 0; 576 addr->v6.sin6_scope_id = 0; 577 addr->v6.sin6_addr.s6_addr32[0] = 0; 578 addr->v6.sin6_addr.s6_addr32[1] = 0; 579 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 580 } 581 582 /* The cookie is always 0 since this is how it's used in the 583 * pmtu code. 584 */ 585 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 586 { 587 if (t->dst && !dst_check(t->dst, t->dst_cookie)) { 588 dst_release(t->dst); 589 t->dst = NULL; 590 } 591 592 return t->dst; 593 } 594 595 #endif /* __net_sctp_h__ */ 596