1 /* SCTP kernel reference 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 reference Implementation 8 * 9 * The base lksctp header. 10 * 11 * The SCTP reference 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 * The SCTP reference 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 66 67 #ifdef TEST_FRAME 68 #undef CONFIG_PROC_FS 69 #undef CONFIG_SCTP_DBG_OBJCNT 70 #undef CONFIG_SYSCTL 71 #endif /* TEST_FRAME */ 72 73 #include <linux/types.h> 74 #include <linux/slab.h> 75 #include <linux/in.h> 76 #include <linux/tty.h> 77 #include <linux/proc_fs.h> 78 #include <linux/spinlock.h> 79 #include <linux/jiffies.h> 80 #include <linux/idr.h> 81 82 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 83 #include <net/ipv6.h> 84 #include <net/ip6_route.h> 85 #endif 86 87 #include <asm/uaccess.h> 88 #include <asm/page.h> 89 #include <net/sock.h> 90 #include <net/snmp.h> 91 #include <net/sctp/structs.h> 92 #include <net/sctp/constants.h> 93 94 95 /* Set SCTP_DEBUG flag via config if not already set. */ 96 #ifndef SCTP_DEBUG 97 #ifdef CONFIG_SCTP_DBG_MSG 98 #define SCTP_DEBUG 1 99 #else 100 #define SCTP_DEBUG 0 101 #endif /* CONFIG_SCTP_DBG */ 102 #endif /* SCTP_DEBUG */ 103 104 #ifdef CONFIG_IP_SCTP_MODULE 105 #define SCTP_PROTOSW_FLAG 0 106 #else /* static! */ 107 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 108 #endif 109 110 111 /* Certain internal static functions need to be exported when 112 * compiled into the test frame. 113 */ 114 #ifndef SCTP_STATIC 115 #define SCTP_STATIC static 116 #endif 117 118 /* 119 * Function declarations. 120 */ 121 122 /* 123 * sctp/protocol.c 124 */ 125 extern struct sock *sctp_get_ctl_sock(void); 126 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *, 127 sctp_scope_t, gfp_t gfp, 128 int flags); 129 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 130 extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 131 132 /* 133 * sctp/socket.c 134 */ 135 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 136 int sctp_inet_listen(struct socket *sock, int backlog); 137 void sctp_write_space(struct sock *sk); 138 unsigned int sctp_poll(struct file *file, struct socket *sock, 139 poll_table *wait); 140 141 /* 142 * sctp/primitive.c 143 */ 144 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); 145 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); 146 int sctp_primitive_ABORT(struct sctp_association *, void *arg); 147 int sctp_primitive_SEND(struct sctp_association *, void *arg); 148 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); 149 int sctp_primitive_ASCONF(struct sctp_association *, void *arg); 150 151 /* 152 * sctp/crc32c.c 153 */ 154 __u32 sctp_start_cksum(__u8 *ptr, __u16 count); 155 __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum); 156 __u32 sctp_end_cksum(__u32 cksum); 157 __u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum); 158 159 /* 160 * sctp/input.c 161 */ 162 int sctp_rcv(struct sk_buff *skb); 163 void sctp_v4_err(struct sk_buff *skb, u32 info); 164 void sctp_hash_established(struct sctp_association *); 165 void sctp_unhash_established(struct sctp_association *); 166 void sctp_hash_endpoint(struct sctp_endpoint *); 167 void sctp_unhash_endpoint(struct sctp_endpoint *); 168 struct sock *sctp_err_lookup(int family, struct sk_buff *, 169 struct sctphdr *, struct sctp_association **, 170 struct sctp_transport **); 171 void sctp_err_finish(struct sock *, struct sctp_association *); 172 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 173 struct sctp_transport *t, __u32 pmtu); 174 void sctp_icmp_proto_unreachable(struct sock *sk, 175 struct sctp_association *asoc, 176 struct sctp_transport *t); 177 void sctp_backlog_migrate(struct sctp_association *assoc, 178 struct sock *oldsk, struct sock *newsk); 179 180 /* 181 * Section: Macros, externs, and inlines 182 */ 183 184 185 #ifdef TEST_FRAME 186 #include <test_frame.h> 187 #else 188 189 /* spin lock wrappers. */ 190 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 191 #define sctp_spin_unlock_irqrestore(lock, flags) \ 192 spin_unlock_irqrestore(lock, flags) 193 #define sctp_local_bh_disable() local_bh_disable() 194 #define sctp_local_bh_enable() local_bh_enable() 195 #define sctp_spin_lock(lock) spin_lock(lock) 196 #define sctp_spin_unlock(lock) spin_unlock(lock) 197 #define sctp_write_lock(lock) write_lock(lock) 198 #define sctp_write_unlock(lock) write_unlock(lock) 199 #define sctp_read_lock(lock) read_lock(lock) 200 #define sctp_read_unlock(lock) read_unlock(lock) 201 202 /* sock lock wrappers. */ 203 #define sctp_lock_sock(sk) lock_sock(sk) 204 #define sctp_release_sock(sk) release_sock(sk) 205 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 206 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 207 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) 208 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) 209 210 /* SCTP SNMP MIB stats handlers */ 211 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 212 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 213 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 214 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 215 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 216 217 #endif /* !TEST_FRAME */ 218 219 220 /* Print debugging messages. */ 221 #if SCTP_DEBUG 222 extern int sctp_debug_flag; 223 #define SCTP_DEBUG_PRINTK(whatever...) \ 224 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 225 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 226 if (sctp_debug_flag) { \ 227 if (saddr->sa.sa_family == AF_INET6) { \ 228 printk(KERN_DEBUG \ 229 lead NIP6_FMT trail, \ 230 leadparm, \ 231 NIP6(saddr->v6.sin6_addr), \ 232 otherparms); \ 233 } else { \ 234 printk(KERN_DEBUG \ 235 lead NIPQUAD_FMT trail, \ 236 leadparm, \ 237 NIPQUAD(saddr->v4.sin_addr.s_addr), \ 238 otherparms); \ 239 } \ 240 } 241 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 242 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 243 244 #define SCTP_ASSERT(expr, str, func) \ 245 if (!(expr)) { \ 246 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 247 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ 248 func; \ 249 } 250 251 #else /* SCTP_DEBUG */ 252 253 #define SCTP_DEBUG_PRINTK(whatever...) 254 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 255 #define SCTP_ENABLE_DEBUG 256 #define SCTP_DISABLE_DEBUG 257 #define SCTP_ASSERT(expr, str, func) 258 259 #endif /* SCTP_DEBUG */ 260 261 262 /* 263 * Macros for keeping a global reference of object allocations. 264 */ 265 #ifdef CONFIG_SCTP_DBG_OBJCNT 266 267 extern atomic_t sctp_dbg_objcnt_sock; 268 extern atomic_t sctp_dbg_objcnt_ep; 269 extern atomic_t sctp_dbg_objcnt_assoc; 270 extern atomic_t sctp_dbg_objcnt_transport; 271 extern atomic_t sctp_dbg_objcnt_chunk; 272 extern atomic_t sctp_dbg_objcnt_bind_addr; 273 extern atomic_t sctp_dbg_objcnt_bind_bucket; 274 extern atomic_t sctp_dbg_objcnt_addr; 275 extern atomic_t sctp_dbg_objcnt_ssnmap; 276 extern atomic_t sctp_dbg_objcnt_datamsg; 277 278 /* Macros to atomically increment/decrement objcnt counters. */ 279 #define SCTP_DBG_OBJCNT_INC(name) \ 280 atomic_inc(&sctp_dbg_objcnt_## name) 281 #define SCTP_DBG_OBJCNT_DEC(name) \ 282 atomic_dec(&sctp_dbg_objcnt_## name) 283 #define SCTP_DBG_OBJCNT(name) \ 284 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 285 286 /* Macro to help create new entries in in the global array of 287 * objcnt counters. 288 */ 289 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 290 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 291 292 void sctp_dbg_objcnt_init(void); 293 void sctp_dbg_objcnt_exit(void); 294 295 #else 296 297 #define SCTP_DBG_OBJCNT_INC(name) 298 #define SCTP_DBG_OBJCNT_DEC(name) 299 300 static inline void sctp_dbg_objcnt_init(void) { return; } 301 static inline void sctp_dbg_objcnt_exit(void) { return; } 302 303 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 304 305 #if defined CONFIG_SYSCTL 306 void sctp_sysctl_register(void); 307 void sctp_sysctl_unregister(void); 308 #else 309 static inline void sctp_sysctl_register(void) { return; } 310 static inline void sctp_sysctl_unregister(void) { return; } 311 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen, 312 void __user *oldval, size_t __user *oldlenp, 313 void __user *newval, size_t newlen, void **context) { 314 return -ENOSYS; 315 } 316 #endif 317 318 /* Size of Supported Address Parameter for 'x' address types. */ 319 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 320 321 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 322 323 int sctp_v6_init(void); 324 void sctp_v6_exit(void); 325 326 #else /* #ifdef defined(CONFIG_IPV6) */ 327 328 static inline int sctp_v6_init(void) { return 0; } 329 static inline void sctp_v6_exit(void) { return; } 330 331 #endif /* #if defined(CONFIG_IPV6) */ 332 333 /* Some wrappers, in case crypto not available. */ 334 #if defined (CONFIG_CRYPTO_HMAC) 335 #define sctp_crypto_alloc_tfm crypto_alloc_tfm 336 #define sctp_crypto_free_tfm crypto_free_tfm 337 #define sctp_crypto_hmac crypto_hmac 338 #else 339 #define sctp_crypto_alloc_tfm(x...) NULL 340 #define sctp_crypto_free_tfm(x...) 341 #define sctp_crypto_hmac(x...) 342 #endif 343 344 345 /* Map an association to an assoc_id. */ 346 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 347 { 348 return (asoc?asoc->assoc_id:0); 349 } 350 351 /* Look up the association by its id. */ 352 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 353 354 355 /* A macro to walk a list of skbs. */ 356 #define sctp_skb_for_each(pos, head, tmp) \ 357 for (pos = (head)->next;\ 358 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ 359 pos = tmp) 360 361 362 /* 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 sctp_spin_lock_irqsave(&head->lock, flags); 369 sctp_spin_lock(&list->lock); 370 371 list_splice((struct list_head *)list, (struct list_head *)head->prev); 372 373 head->qlen += list->qlen; 374 list->qlen = 0; 375 376 sctp_spin_unlock(&list->lock); 377 sctp_spin_unlock_irqrestore(&head->lock, flags); 378 } 379 380 /** 381 * sctp_list_dequeue - remove from the head of the queue 382 * @list: list to dequeue from 383 * 384 * Remove the head of the list. The head item is 385 * returned or %NULL if the list is empty. 386 */ 387 388 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 389 { 390 struct list_head *result = NULL; 391 392 if (list->next != list) { 393 result = list->next; 394 list->next = result->next; 395 list->next->prev = list; 396 INIT_LIST_HEAD(result); 397 } 398 return result; 399 } 400 401 /* Tests if the list has one and only one entry. */ 402 static inline int sctp_list_single_entry(struct list_head *head) 403 { 404 return ((head->next != head) && (head->next == head->prev)); 405 } 406 407 /* Calculate the size (in bytes) occupied by the data of an iovec. */ 408 static inline size_t get_user_iov_size(struct iovec *iov, int iovlen) 409 { 410 size_t retval = 0; 411 412 for (; iovlen > 0; --iovlen) { 413 retval += iov->iov_len; 414 iov++; 415 } 416 417 return retval; 418 } 419 420 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 421 static inline __s32 sctp_jitter(__u32 rto) 422 { 423 static __u32 sctp_rand; 424 __s32 ret; 425 426 /* Avoid divide by zero. */ 427 if (!rto) 428 rto = 1; 429 430 sctp_rand += jiffies; 431 sctp_rand ^= (sctp_rand << 12); 432 sctp_rand ^= (sctp_rand >> 20); 433 434 /* Choose random number from 0 to rto, then move to -50% ~ +50% 435 * of rto. 436 */ 437 ret = sctp_rand % rto - (rto >> 1); 438 return ret; 439 } 440 441 /* Break down data chunks at this point. */ 442 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 443 { 444 int frag = pmtu; 445 446 frag -= sp->pf->af->net_header_len; 447 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 448 449 if (sp->user_frag) 450 frag = min_t(int, frag, sp->user_frag); 451 452 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 453 454 return frag; 455 } 456 457 /* Walk through a list of TLV parameters. Don't trust the 458 * individual parameter lengths and instead depend on 459 * the chunk length to indicate when to stop. Make sure 460 * there is room for a param header too. 461 */ 462 #define sctp_walk_params(pos, chunk, member)\ 463 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 464 465 #define _sctp_walk_params(pos, chunk, end, member)\ 466 for (pos.v = chunk->member;\ 467 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 468 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 469 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 470 pos.v += WORD_ROUND(ntohs(pos.p->length))) 471 472 #define sctp_walk_errors(err, chunk_hdr)\ 473 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 474 475 #define _sctp_walk_errors(err, chunk_hdr, end)\ 476 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 477 sizeof(sctp_chunkhdr_t));\ 478 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 479 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 480 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 481 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 482 483 #define sctp_walk_fwdtsn(pos, chunk)\ 484 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 485 486 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 487 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 488 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 489 pos++) 490 491 /* Round an int up to the next multiple of 4. */ 492 #define WORD_ROUND(s) (((s)+3)&~3) 493 494 /* Make a new instance of type. */ 495 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 496 497 /* Compare two timevals. */ 498 #define tv_lt(s, t) \ 499 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 500 501 /* Add tv1 to tv2. */ 502 #define TIMEVAL_ADD(tv1, tv2) \ 503 ({ \ 504 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 505 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 506 \ 507 if (usecs >= 1000000) { \ 508 usecs -= 1000000; \ 509 secs++; \ 510 } \ 511 (tv2).tv_sec = secs; \ 512 (tv2).tv_usec = usecs; \ 513 }) 514 515 /* External references. */ 516 517 extern struct proto sctp_prot; 518 extern struct proto sctpv6_prot; 519 extern struct proc_dir_entry *proc_net_sctp; 520 void sctp_put_port(struct sock *sk); 521 522 extern struct idr sctp_assocs_id; 523 extern spinlock_t sctp_assocs_id_lock; 524 525 /* Static inline functions. */ 526 527 /* Convert from an IP version number to an Address Family symbol. */ 528 static inline int ipver2af(__u8 ipver) 529 { 530 switch (ipver) { 531 case 4: 532 return AF_INET; 533 case 6: 534 return AF_INET6; 535 default: 536 return 0; 537 }; 538 } 539 540 /* Convert from an address parameter type to an address family. */ 541 static inline int param_type2af(__u16 type) 542 { 543 switch (type) { 544 case SCTP_PARAM_IPV4_ADDRESS: 545 return AF_INET; 546 case SCTP_PARAM_IPV6_ADDRESS: 547 return AF_INET6; 548 default: 549 return 0; 550 }; 551 } 552 553 /* Perform some sanity checks. */ 554 static inline int sctp_sanity_check(void) 555 { 556 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 557 sizeof(((struct sk_buff *)0)->cb), 558 "SCTP: ulpevent does not fit in skb!\n", return 0); 559 560 return 1; 561 } 562 563 /* Warning: The following hash functions assume a power of two 'size'. */ 564 /* This is the hash function for the SCTP port hash table. */ 565 static inline int sctp_phashfn(__u16 lport) 566 { 567 return (lport & (sctp_port_hashsize - 1)); 568 } 569 570 /* This is the hash function for the endpoint hash table. */ 571 static inline int sctp_ep_hashfn(__u16 lport) 572 { 573 return (lport & (sctp_ep_hashsize - 1)); 574 } 575 576 /* This is the hash function for the association hash table. */ 577 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 578 { 579 int h = (lport << 16) + rport; 580 h ^= h>>8; 581 return (h & (sctp_assoc_hashsize - 1)); 582 } 583 584 /* This is the hash function for the association hash table. This is 585 * not used yet, but could be used as a better hash function when 586 * we have a vtag. 587 */ 588 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 589 { 590 int h = (lport << 16) + rport; 591 h ^= vtag; 592 return (h & (sctp_assoc_hashsize-1)); 593 } 594 595 /* Is a socket of this style? */ 596 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 597 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 598 { 599 return sctp_sk(sk)->type == style; 600 } 601 602 /* Is the association in this state? */ 603 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 604 static inline int __sctp_state(const struct sctp_association *asoc, 605 sctp_state_t state) 606 { 607 return asoc->state == state; 608 } 609 610 /* Is the socket in this state? */ 611 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 612 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 613 { 614 return sk->sk_state == state; 615 } 616 617 /* Map v4-mapped v6 address back to v4 address */ 618 static inline void sctp_v6_map_v4(union sctp_addr *addr) 619 { 620 addr->v4.sin_family = AF_INET; 621 addr->v4.sin_port = addr->v6.sin6_port; 622 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 623 } 624 625 /* Map v4 address to v4-mapped v6 address */ 626 static inline void sctp_v4_map_v6(union sctp_addr *addr) 627 { 628 addr->v6.sin6_family = AF_INET6; 629 addr->v6.sin6_port = addr->v4.sin_port; 630 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 631 addr->v6.sin6_addr.s6_addr32[0] = 0; 632 addr->v6.sin6_addr.s6_addr32[1] = 0; 633 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 634 } 635 636 #endif /* __net_sctp_h__ */ 637