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 #include <linux/config.h> 67 68 #ifdef TEST_FRAME 69 #undef CONFIG_PROC_FS 70 #undef CONFIG_SCTP_DBG_OBJCNT 71 #undef CONFIG_SYSCTL 72 #endif /* TEST_FRAME */ 73 74 #include <linux/types.h> 75 #include <linux/slab.h> 76 #include <linux/in.h> 77 #include <linux/tty.h> 78 #include <linux/proc_fs.h> 79 #include <linux/spinlock.h> 80 #include <linux/jiffies.h> 81 #include <linux/idr.h> 82 83 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 84 #include <net/ipv6.h> 85 #include <net/ip6_route.h> 86 #endif 87 88 #include <asm/uaccess.h> 89 #include <asm/page.h> 90 #include <net/sock.h> 91 #include <net/snmp.h> 92 #include <net/sctp/structs.h> 93 #include <net/sctp/constants.h> 94 95 96 /* Set SCTP_DEBUG flag via config if not already set. */ 97 #ifndef SCTP_DEBUG 98 #ifdef CONFIG_SCTP_DBG_MSG 99 #define SCTP_DEBUG 1 100 #else 101 #define SCTP_DEBUG 0 102 #endif /* CONFIG_SCTP_DBG */ 103 #endif /* SCTP_DEBUG */ 104 105 #ifdef CONFIG_IP_SCTP_MODULE 106 #define SCTP_PROTOSW_FLAG 0 107 #else /* static! */ 108 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 109 #endif 110 111 112 /* Certain internal static functions need to be exported when 113 * compiled into the test frame. 114 */ 115 #ifndef SCTP_STATIC 116 #define SCTP_STATIC static 117 #endif 118 119 /* 120 * Function declarations. 121 */ 122 123 /* 124 * sctp/protocol.c 125 */ 126 extern struct sock *sctp_get_ctl_sock(void); 127 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *, 128 sctp_scope_t, gfp_t gfp, 129 int flags); 130 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 131 extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 132 133 /* 134 * sctp/socket.c 135 */ 136 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 137 int sctp_inet_listen(struct socket *sock, int backlog); 138 void sctp_write_space(struct sock *sk); 139 unsigned int sctp_poll(struct file *file, struct socket *sock, 140 poll_table *wait); 141 142 /* 143 * sctp/primitive.c 144 */ 145 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); 146 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); 147 int sctp_primitive_ABORT(struct sctp_association *, void *arg); 148 int sctp_primitive_SEND(struct sctp_association *, void *arg); 149 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); 150 int sctp_primitive_ASCONF(struct sctp_association *, void *arg); 151 152 /* 153 * sctp/crc32c.c 154 */ 155 __u32 sctp_start_cksum(__u8 *ptr, __u16 count); 156 __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum); 157 __u32 sctp_end_cksum(__u32 cksum); 158 __u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum); 159 160 /* 161 * sctp/input.c 162 */ 163 int sctp_rcv(struct sk_buff *skb); 164 void sctp_v4_err(struct sk_buff *skb, u32 info); 165 void sctp_hash_established(struct sctp_association *); 166 void sctp_unhash_established(struct sctp_association *); 167 void sctp_hash_endpoint(struct sctp_endpoint *); 168 void sctp_unhash_endpoint(struct sctp_endpoint *); 169 struct sock *sctp_err_lookup(int family, struct sk_buff *, 170 struct sctphdr *, struct sctp_association **, 171 struct sctp_transport **); 172 void sctp_err_finish(struct sock *, struct sctp_association *); 173 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 174 struct sctp_transport *t, __u32 pmtu); 175 void sctp_icmp_proto_unreachable(struct sock *sk, 176 struct sctp_association *asoc, 177 struct sctp_transport *t); 178 179 /* 180 * Section: Macros, externs, and inlines 181 */ 182 183 184 #ifdef TEST_FRAME 185 #include <test_frame.h> 186 #else 187 188 /* spin lock wrappers. */ 189 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 190 #define sctp_spin_unlock_irqrestore(lock, flags) \ 191 spin_unlock_irqrestore(lock, flags) 192 #define sctp_local_bh_disable() local_bh_disable() 193 #define sctp_local_bh_enable() local_bh_enable() 194 #define sctp_spin_lock(lock) spin_lock(lock) 195 #define sctp_spin_unlock(lock) spin_unlock(lock) 196 #define sctp_write_lock(lock) write_lock(lock) 197 #define sctp_write_unlock(lock) write_unlock(lock) 198 #define sctp_read_lock(lock) read_lock(lock) 199 #define sctp_read_unlock(lock) read_unlock(lock) 200 201 /* sock lock wrappers. */ 202 #define sctp_lock_sock(sk) lock_sock(sk) 203 #define sctp_release_sock(sk) release_sock(sk) 204 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 205 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 206 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) 207 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) 208 209 /* SCTP SNMP MIB stats handlers */ 210 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 211 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 212 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 213 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 214 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 215 216 #endif /* !TEST_FRAME */ 217 218 219 /* Print debugging messages. */ 220 #if SCTP_DEBUG 221 extern int sctp_debug_flag; 222 #define SCTP_DEBUG_PRINTK(whatever...) \ 223 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 224 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 225 if (sctp_debug_flag) { \ 226 if (saddr->sa.sa_family == AF_INET6) { \ 227 printk(KERN_DEBUG \ 228 lead "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" trail, \ 229 leadparm, \ 230 NIP6(saddr->v6.sin6_addr), \ 231 otherparms); \ 232 } else { \ 233 printk(KERN_DEBUG \ 234 lead "%u.%u.%u.%u" trail, \ 235 leadparm, \ 236 NIPQUAD(saddr->v4.sin_addr.s_addr), \ 237 otherparms); \ 238 } \ 239 } 240 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 241 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 242 243 #define SCTP_ASSERT(expr, str, func) \ 244 if (!(expr)) { \ 245 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 246 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ 247 func; \ 248 } 249 250 #else /* SCTP_DEBUG */ 251 252 #define SCTP_DEBUG_PRINTK(whatever...) 253 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 254 #define SCTP_ENABLE_DEBUG 255 #define SCTP_DISABLE_DEBUG 256 #define SCTP_ASSERT(expr, str, func) 257 258 #endif /* SCTP_DEBUG */ 259 260 261 /* 262 * Macros for keeping a global reference of object allocations. 263 */ 264 #ifdef CONFIG_SCTP_DBG_OBJCNT 265 266 extern atomic_t sctp_dbg_objcnt_sock; 267 extern atomic_t sctp_dbg_objcnt_ep; 268 extern atomic_t sctp_dbg_objcnt_assoc; 269 extern atomic_t sctp_dbg_objcnt_transport; 270 extern atomic_t sctp_dbg_objcnt_chunk; 271 extern atomic_t sctp_dbg_objcnt_bind_addr; 272 extern atomic_t sctp_dbg_objcnt_bind_bucket; 273 extern atomic_t sctp_dbg_objcnt_addr; 274 extern atomic_t sctp_dbg_objcnt_ssnmap; 275 extern atomic_t sctp_dbg_objcnt_datamsg; 276 277 /* Macros to atomically increment/decrement objcnt counters. */ 278 #define SCTP_DBG_OBJCNT_INC(name) \ 279 atomic_inc(&sctp_dbg_objcnt_## name) 280 #define SCTP_DBG_OBJCNT_DEC(name) \ 281 atomic_dec(&sctp_dbg_objcnt_## name) 282 #define SCTP_DBG_OBJCNT(name) \ 283 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 284 285 /* Macro to help create new entries in in the global array of 286 * objcnt counters. 287 */ 288 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 289 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 290 291 void sctp_dbg_objcnt_init(void); 292 void sctp_dbg_objcnt_exit(void); 293 294 #else 295 296 #define SCTP_DBG_OBJCNT_INC(name) 297 #define SCTP_DBG_OBJCNT_DEC(name) 298 299 static inline void sctp_dbg_objcnt_init(void) { return; } 300 static inline void sctp_dbg_objcnt_exit(void) { return; } 301 302 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 303 304 #if defined CONFIG_SYSCTL 305 void sctp_sysctl_register(void); 306 void sctp_sysctl_unregister(void); 307 #else 308 static inline void sctp_sysctl_register(void) { return; } 309 static inline void sctp_sysctl_unregister(void) { return; } 310 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen, 311 void __user *oldval, size_t __user *oldlenp, 312 void __user *newval, size_t newlen, void **context) { 313 return -ENOSYS; 314 } 315 #endif 316 317 /* Size of Supported Address Parameter for 'x' address types. */ 318 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 319 320 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 321 322 int sctp_v6_init(void); 323 void sctp_v6_exit(void); 324 325 #else /* #ifdef defined(CONFIG_IPV6) */ 326 327 static inline int sctp_v6_init(void) { return 0; } 328 static inline void sctp_v6_exit(void) { return; } 329 330 #endif /* #if defined(CONFIG_IPV6) */ 331 332 /* Some wrappers, in case crypto not available. */ 333 #if defined (CONFIG_CRYPTO_HMAC) 334 #define sctp_crypto_alloc_tfm crypto_alloc_tfm 335 #define sctp_crypto_free_tfm crypto_free_tfm 336 #define sctp_crypto_hmac crypto_hmac 337 #else 338 #define sctp_crypto_alloc_tfm(x...) NULL 339 #define sctp_crypto_free_tfm(x...) 340 #define sctp_crypto_hmac(x...) 341 #endif 342 343 344 /* Map an association to an assoc_id. */ 345 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 346 { 347 return (asoc?asoc->assoc_id:0); 348 } 349 350 /* Look up the association by its id. */ 351 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 352 353 354 /* A macro to walk a list of skbs. */ 355 #define sctp_skb_for_each(pos, head, tmp) \ 356 for (pos = (head)->next;\ 357 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ 358 pos = tmp) 359 360 361 /* A helper to append an entire skb list (list) to another (head). */ 362 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 363 struct sk_buff_head *head) 364 { 365 unsigned long flags; 366 367 sctp_spin_lock_irqsave(&head->lock, flags); 368 sctp_spin_lock(&list->lock); 369 370 list_splice((struct list_head *)list, (struct list_head *)head->prev); 371 372 head->qlen += list->qlen; 373 list->qlen = 0; 374 375 sctp_spin_unlock(&list->lock); 376 sctp_spin_unlock_irqrestore(&head->lock, flags); 377 } 378 379 /** 380 * sctp_list_dequeue - remove from the head of the queue 381 * @list: list to dequeue from 382 * 383 * Remove the head of the list. The head item is 384 * returned or %NULL if the list is empty. 385 */ 386 387 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 388 { 389 struct list_head *result = NULL; 390 391 if (list->next != list) { 392 result = list->next; 393 list->next = result->next; 394 list->next->prev = list; 395 INIT_LIST_HEAD(result); 396 } 397 return result; 398 } 399 400 /* Tests if the list has one and only one entry. */ 401 static inline int sctp_list_single_entry(struct list_head *head) 402 { 403 return ((head->next != head) && (head->next == head->prev)); 404 } 405 406 /* Calculate the size (in bytes) occupied by the data of an iovec. */ 407 static inline size_t get_user_iov_size(struct iovec *iov, int iovlen) 408 { 409 size_t retval = 0; 410 411 for (; iovlen > 0; --iovlen) { 412 retval += iov->iov_len; 413 iov++; 414 } 415 416 return retval; 417 } 418 419 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 420 static inline __s32 sctp_jitter(__u32 rto) 421 { 422 static __u32 sctp_rand; 423 __s32 ret; 424 425 /* Avoid divide by zero. */ 426 if (!rto) 427 rto = 1; 428 429 sctp_rand += jiffies; 430 sctp_rand ^= (sctp_rand << 12); 431 sctp_rand ^= (sctp_rand >> 20); 432 433 /* Choose random number from 0 to rto, then move to -50% ~ +50% 434 * of rto. 435 */ 436 ret = sctp_rand % rto - (rto >> 1); 437 return ret; 438 } 439 440 /* Break down data chunks at this point. */ 441 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 442 { 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 (sp->user_frag) 449 frag = min_t(int, frag, sp->user_frag); 450 451 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 452 453 return frag; 454 } 455 456 /* Walk through a list of TLV parameters. Don't trust the 457 * individual parameter lengths and instead depend on 458 * the chunk length to indicate when to stop. Make sure 459 * there is room for a param header too. 460 */ 461 #define sctp_walk_params(pos, chunk, member)\ 462 _sctp_walk_params((pos), (chunk), WORD_ROUND(ntohs((chunk)->chunk_hdr.length)), member) 463 464 #define _sctp_walk_params(pos, chunk, end, member)\ 465 for (pos.v = chunk->member;\ 466 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 467 pos.v <= (void *)chunk + end - WORD_ROUND(ntohs(pos.p->length)) &&\ 468 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 469 pos.v += WORD_ROUND(ntohs(pos.p->length))) 470 471 #define sctp_walk_errors(err, chunk_hdr)\ 472 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 473 474 #define _sctp_walk_errors(err, chunk_hdr, end)\ 475 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 476 sizeof(sctp_chunkhdr_t));\ 477 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 478 (void *)err <= (void *)chunk_hdr + end - WORD_ROUND(ntohs(err->length)) &&\ 479 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 480 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 481 482 #define sctp_walk_fwdtsn(pos, chunk)\ 483 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 484 485 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 486 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 487 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 488 pos++) 489 490 /* Round an int up to the next multiple of 4. */ 491 #define WORD_ROUND(s) (((s)+3)&~3) 492 493 /* Make a new instance of type. */ 494 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 495 496 /* Compare two timevals. */ 497 #define tv_lt(s, t) \ 498 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 499 500 /* Add tv1 to tv2. */ 501 #define TIMEVAL_ADD(tv1, tv2) \ 502 ({ \ 503 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 504 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 505 \ 506 if (usecs >= 1000000) { \ 507 usecs -= 1000000; \ 508 secs++; \ 509 } \ 510 (tv2).tv_sec = secs; \ 511 (tv2).tv_usec = usecs; \ 512 }) 513 514 /* External references. */ 515 516 extern struct proto sctp_prot; 517 extern struct proto sctpv6_prot; 518 extern struct proc_dir_entry *proc_net_sctp; 519 void sctp_put_port(struct sock *sk); 520 521 extern struct idr sctp_assocs_id; 522 extern spinlock_t sctp_assocs_id_lock; 523 524 /* Static inline functions. */ 525 526 /* Convert from an IP version number to an Address Family symbol. */ 527 static inline int ipver2af(__u8 ipver) 528 { 529 switch (ipver) { 530 case 4: 531 return AF_INET; 532 case 6: 533 return AF_INET6; 534 default: 535 return 0; 536 }; 537 } 538 539 /* Convert from an address parameter type to an address family. */ 540 static inline int param_type2af(__u16 type) 541 { 542 switch (type) { 543 case SCTP_PARAM_IPV4_ADDRESS: 544 return AF_INET; 545 case SCTP_PARAM_IPV6_ADDRESS: 546 return AF_INET6; 547 default: 548 return 0; 549 }; 550 } 551 552 /* Perform some sanity checks. */ 553 static inline int sctp_sanity_check(void) 554 { 555 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 556 sizeof(((struct sk_buff *)0)->cb), 557 "SCTP: ulpevent does not fit in skb!\n", return 0); 558 559 return 1; 560 } 561 562 /* Warning: The following hash functions assume a power of two 'size'. */ 563 /* This is the hash function for the SCTP port hash table. */ 564 static inline int sctp_phashfn(__u16 lport) 565 { 566 return (lport & (sctp_port_hashsize - 1)); 567 } 568 569 /* This is the hash function for the endpoint hash table. */ 570 static inline int sctp_ep_hashfn(__u16 lport) 571 { 572 return (lport & (sctp_ep_hashsize - 1)); 573 } 574 575 /* This is the hash function for the association hash table. */ 576 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 577 { 578 int h = (lport << 16) + rport; 579 h ^= h>>8; 580 return (h & (sctp_assoc_hashsize - 1)); 581 } 582 583 /* This is the hash function for the association hash table. This is 584 * not used yet, but could be used as a better hash function when 585 * we have a vtag. 586 */ 587 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 588 { 589 int h = (lport << 16) + rport; 590 h ^= vtag; 591 return (h & (sctp_assoc_hashsize-1)); 592 } 593 594 /* Is a socket of this style? */ 595 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 596 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 597 { 598 return sctp_sk(sk)->type == style; 599 } 600 601 /* Is the association in this state? */ 602 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 603 static inline int __sctp_state(const struct sctp_association *asoc, 604 sctp_state_t state) 605 { 606 return asoc->state == state; 607 } 608 609 /* Is the socket in this state? */ 610 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 611 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 612 { 613 return sk->sk_state == state; 614 } 615 616 /* Map v4-mapped v6 address back to v4 address */ 617 static inline void sctp_v6_map_v4(union sctp_addr *addr) 618 { 619 addr->v4.sin_family = AF_INET; 620 addr->v4.sin_port = addr->v6.sin6_port; 621 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 622 } 623 624 /* Map v4 address to v4-mapped v6 address */ 625 static inline void sctp_v4_map_v6(union sctp_addr *addr) 626 { 627 addr->v6.sin6_family = AF_INET6; 628 addr->v6.sin6_port = addr->v4.sin_port; 629 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 630 addr->v6.sin6_addr.s6_addr32[0] = 0; 631 addr->v6.sin6_addr.s6_addr32[1] = 0; 632 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 633 } 634 635 #endif /* __net_sctp_h__ */ 636