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 void sctp_backlog_migrate(struct sctp_association *assoc, 179 struct sock *oldsk, struct sock *newsk); 180 181 /* 182 * Section: Macros, externs, and inlines 183 */ 184 185 186 #ifdef TEST_FRAME 187 #include <test_frame.h> 188 #else 189 190 /* spin lock wrappers. */ 191 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 192 #define sctp_spin_unlock_irqrestore(lock, flags) \ 193 spin_unlock_irqrestore(lock, flags) 194 #define sctp_local_bh_disable() local_bh_disable() 195 #define sctp_local_bh_enable() local_bh_enable() 196 #define sctp_spin_lock(lock) spin_lock(lock) 197 #define sctp_spin_unlock(lock) spin_unlock(lock) 198 #define sctp_write_lock(lock) write_lock(lock) 199 #define sctp_write_unlock(lock) write_unlock(lock) 200 #define sctp_read_lock(lock) read_lock(lock) 201 #define sctp_read_unlock(lock) read_unlock(lock) 202 203 /* sock lock wrappers. */ 204 #define sctp_lock_sock(sk) lock_sock(sk) 205 #define sctp_release_sock(sk) release_sock(sk) 206 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 207 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 208 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) 209 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) 210 211 /* SCTP SNMP MIB stats handlers */ 212 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 213 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 214 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 215 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 216 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 217 218 #endif /* !TEST_FRAME */ 219 220 221 /* Print debugging messages. */ 222 #if SCTP_DEBUG 223 extern int sctp_debug_flag; 224 #define SCTP_DEBUG_PRINTK(whatever...) \ 225 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 226 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 227 if (sctp_debug_flag) { \ 228 if (saddr->sa.sa_family == AF_INET6) { \ 229 printk(KERN_DEBUG \ 230 lead NIP6_FMT trail, \ 231 leadparm, \ 232 NIP6(saddr->v6.sin6_addr), \ 233 otherparms); \ 234 } else { \ 235 printk(KERN_DEBUG \ 236 lead NIPQUAD_FMT trail, \ 237 leadparm, \ 238 NIPQUAD(saddr->v4.sin_addr.s_addr), \ 239 otherparms); \ 240 } \ 241 } 242 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 243 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 244 245 #define SCTP_ASSERT(expr, str, func) \ 246 if (!(expr)) { \ 247 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 248 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ 249 func; \ 250 } 251 252 #else /* SCTP_DEBUG */ 253 254 #define SCTP_DEBUG_PRINTK(whatever...) 255 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 256 #define SCTP_ENABLE_DEBUG 257 #define SCTP_DISABLE_DEBUG 258 #define SCTP_ASSERT(expr, str, func) 259 260 #endif /* SCTP_DEBUG */ 261 262 263 /* 264 * Macros for keeping a global reference of object allocations. 265 */ 266 #ifdef CONFIG_SCTP_DBG_OBJCNT 267 268 extern atomic_t sctp_dbg_objcnt_sock; 269 extern atomic_t sctp_dbg_objcnt_ep; 270 extern atomic_t sctp_dbg_objcnt_assoc; 271 extern atomic_t sctp_dbg_objcnt_transport; 272 extern atomic_t sctp_dbg_objcnt_chunk; 273 extern atomic_t sctp_dbg_objcnt_bind_addr; 274 extern atomic_t sctp_dbg_objcnt_bind_bucket; 275 extern atomic_t sctp_dbg_objcnt_addr; 276 extern atomic_t sctp_dbg_objcnt_ssnmap; 277 extern atomic_t sctp_dbg_objcnt_datamsg; 278 279 /* Macros to atomically increment/decrement objcnt counters. */ 280 #define SCTP_DBG_OBJCNT_INC(name) \ 281 atomic_inc(&sctp_dbg_objcnt_## name) 282 #define SCTP_DBG_OBJCNT_DEC(name) \ 283 atomic_dec(&sctp_dbg_objcnt_## name) 284 #define SCTP_DBG_OBJCNT(name) \ 285 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 286 287 /* Macro to help create new entries in in the global array of 288 * objcnt counters. 289 */ 290 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 291 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 292 293 void sctp_dbg_objcnt_init(void); 294 void sctp_dbg_objcnt_exit(void); 295 296 #else 297 298 #define SCTP_DBG_OBJCNT_INC(name) 299 #define SCTP_DBG_OBJCNT_DEC(name) 300 301 static inline void sctp_dbg_objcnt_init(void) { return; } 302 static inline void sctp_dbg_objcnt_exit(void) { return; } 303 304 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 305 306 #if defined CONFIG_SYSCTL 307 void sctp_sysctl_register(void); 308 void sctp_sysctl_unregister(void); 309 #else 310 static inline void sctp_sysctl_register(void) { return; } 311 static inline void sctp_sysctl_unregister(void) { return; } 312 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen, 313 void __user *oldval, size_t __user *oldlenp, 314 void __user *newval, size_t newlen, void **context) { 315 return -ENOSYS; 316 } 317 #endif 318 319 /* Size of Supported Address Parameter for 'x' address types. */ 320 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 321 322 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 323 324 int sctp_v6_init(void); 325 void sctp_v6_exit(void); 326 327 #else /* #ifdef defined(CONFIG_IPV6) */ 328 329 static inline int sctp_v6_init(void) { return 0; } 330 static inline void sctp_v6_exit(void) { return; } 331 332 #endif /* #if defined(CONFIG_IPV6) */ 333 334 /* Some wrappers, in case crypto not available. */ 335 #if defined (CONFIG_CRYPTO_HMAC) 336 #define sctp_crypto_alloc_tfm crypto_alloc_tfm 337 #define sctp_crypto_free_tfm crypto_free_tfm 338 #define sctp_crypto_hmac crypto_hmac 339 #else 340 #define sctp_crypto_alloc_tfm(x...) NULL 341 #define sctp_crypto_free_tfm(x...) 342 #define sctp_crypto_hmac(x...) 343 #endif 344 345 346 /* Map an association to an assoc_id. */ 347 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 348 { 349 return (asoc?asoc->assoc_id:0); 350 } 351 352 /* Look up the association by its id. */ 353 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 354 355 356 /* A macro to walk a list of skbs. */ 357 #define sctp_skb_for_each(pos, head, tmp) \ 358 for (pos = (head)->next;\ 359 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ 360 pos = tmp) 361 362 363 /* A helper to append an entire skb list (list) to another (head). */ 364 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 365 struct sk_buff_head *head) 366 { 367 unsigned long flags; 368 369 sctp_spin_lock_irqsave(&head->lock, flags); 370 sctp_spin_lock(&list->lock); 371 372 list_splice((struct list_head *)list, (struct list_head *)head->prev); 373 374 head->qlen += list->qlen; 375 list->qlen = 0; 376 377 sctp_spin_unlock(&list->lock); 378 sctp_spin_unlock_irqrestore(&head->lock, flags); 379 } 380 381 /** 382 * sctp_list_dequeue - remove from the head of the queue 383 * @list: list to dequeue from 384 * 385 * Remove the head of the list. The head item is 386 * returned or %NULL if the list is empty. 387 */ 388 389 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 390 { 391 struct list_head *result = NULL; 392 393 if (list->next != list) { 394 result = list->next; 395 list->next = result->next; 396 list->next->prev = list; 397 INIT_LIST_HEAD(result); 398 } 399 return result; 400 } 401 402 /* Tests if the list has one and only one entry. */ 403 static inline int sctp_list_single_entry(struct list_head *head) 404 { 405 return ((head->next != head) && (head->next == head->prev)); 406 } 407 408 /* Calculate the size (in bytes) occupied by the data of an iovec. */ 409 static inline size_t get_user_iov_size(struct iovec *iov, int iovlen) 410 { 411 size_t retval = 0; 412 413 for (; iovlen > 0; --iovlen) { 414 retval += iov->iov_len; 415 iov++; 416 } 417 418 return retval; 419 } 420 421 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 422 static inline __s32 sctp_jitter(__u32 rto) 423 { 424 static __u32 sctp_rand; 425 __s32 ret; 426 427 /* Avoid divide by zero. */ 428 if (!rto) 429 rto = 1; 430 431 sctp_rand += jiffies; 432 sctp_rand ^= (sctp_rand << 12); 433 sctp_rand ^= (sctp_rand >> 20); 434 435 /* Choose random number from 0 to rto, then move to -50% ~ +50% 436 * of rto. 437 */ 438 ret = sctp_rand % rto - (rto >> 1); 439 return ret; 440 } 441 442 /* Break down data chunks at this point. */ 443 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 444 { 445 int frag = pmtu; 446 447 frag -= sp->pf->af->net_header_len; 448 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 449 450 if (sp->user_frag) 451 frag = min_t(int, frag, sp->user_frag); 452 453 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 454 455 return frag; 456 } 457 458 /* Walk through a list of TLV parameters. Don't trust the 459 * individual parameter lengths and instead depend on 460 * the chunk length to indicate when to stop. Make sure 461 * there is room for a param header too. 462 */ 463 #define sctp_walk_params(pos, chunk, member)\ 464 _sctp_walk_params((pos), (chunk), WORD_ROUND(ntohs((chunk)->chunk_hdr.length)), member) 465 466 #define _sctp_walk_params(pos, chunk, end, member)\ 467 for (pos.v = chunk->member;\ 468 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 469 pos.v <= (void *)chunk + end - WORD_ROUND(ntohs(pos.p->length)) &&\ 470 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 471 pos.v += WORD_ROUND(ntohs(pos.p->length))) 472 473 #define sctp_walk_errors(err, chunk_hdr)\ 474 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 475 476 #define _sctp_walk_errors(err, chunk_hdr, end)\ 477 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 478 sizeof(sctp_chunkhdr_t));\ 479 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 480 (void *)err <= (void *)chunk_hdr + end - WORD_ROUND(ntohs(err->length)) &&\ 481 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 482 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 483 484 #define sctp_walk_fwdtsn(pos, chunk)\ 485 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 486 487 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 488 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 489 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 490 pos++) 491 492 /* Round an int up to the next multiple of 4. */ 493 #define WORD_ROUND(s) (((s)+3)&~3) 494 495 /* Make a new instance of type. */ 496 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 497 498 /* Compare two timevals. */ 499 #define tv_lt(s, t) \ 500 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 501 502 /* Add tv1 to tv2. */ 503 #define TIMEVAL_ADD(tv1, tv2) \ 504 ({ \ 505 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 506 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 507 \ 508 if (usecs >= 1000000) { \ 509 usecs -= 1000000; \ 510 secs++; \ 511 } \ 512 (tv2).tv_sec = secs; \ 513 (tv2).tv_usec = usecs; \ 514 }) 515 516 /* External references. */ 517 518 extern struct proto sctp_prot; 519 extern struct proto sctpv6_prot; 520 extern struct proc_dir_entry *proc_net_sctp; 521 void sctp_put_port(struct sock *sk); 522 523 extern struct idr sctp_assocs_id; 524 extern spinlock_t sctp_assocs_id_lock; 525 526 /* Static inline functions. */ 527 528 /* Convert from an IP version number to an Address Family symbol. */ 529 static inline int ipver2af(__u8 ipver) 530 { 531 switch (ipver) { 532 case 4: 533 return AF_INET; 534 case 6: 535 return AF_INET6; 536 default: 537 return 0; 538 }; 539 } 540 541 /* Convert from an address parameter type to an address family. */ 542 static inline int param_type2af(__u16 type) 543 { 544 switch (type) { 545 case SCTP_PARAM_IPV4_ADDRESS: 546 return AF_INET; 547 case SCTP_PARAM_IPV6_ADDRESS: 548 return AF_INET6; 549 default: 550 return 0; 551 }; 552 } 553 554 /* Perform some sanity checks. */ 555 static inline int sctp_sanity_check(void) 556 { 557 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 558 sizeof(((struct sk_buff *)0)->cb), 559 "SCTP: ulpevent does not fit in skb!\n", return 0); 560 561 return 1; 562 } 563 564 /* Warning: The following hash functions assume a power of two 'size'. */ 565 /* This is the hash function for the SCTP port hash table. */ 566 static inline int sctp_phashfn(__u16 lport) 567 { 568 return (lport & (sctp_port_hashsize - 1)); 569 } 570 571 /* This is the hash function for the endpoint hash table. */ 572 static inline int sctp_ep_hashfn(__u16 lport) 573 { 574 return (lport & (sctp_ep_hashsize - 1)); 575 } 576 577 /* This is the hash function for the association hash table. */ 578 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 579 { 580 int h = (lport << 16) + rport; 581 h ^= h>>8; 582 return (h & (sctp_assoc_hashsize - 1)); 583 } 584 585 /* This is the hash function for the association hash table. This is 586 * not used yet, but could be used as a better hash function when 587 * we have a vtag. 588 */ 589 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 590 { 591 int h = (lport << 16) + rport; 592 h ^= vtag; 593 return (h & (sctp_assoc_hashsize-1)); 594 } 595 596 /* Is a socket of this style? */ 597 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 598 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 599 { 600 return sctp_sk(sk)->type == style; 601 } 602 603 /* Is the association in this state? */ 604 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 605 static inline int __sctp_state(const struct sctp_association *asoc, 606 sctp_state_t state) 607 { 608 return asoc->state == state; 609 } 610 611 /* Is the socket in this state? */ 612 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 613 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 614 { 615 return sk->sk_state == state; 616 } 617 618 /* Map v4-mapped v6 address back to v4 address */ 619 static inline void sctp_v6_map_v4(union sctp_addr *addr) 620 { 621 addr->v4.sin_family = AF_INET; 622 addr->v4.sin_port = addr->v6.sin6_port; 623 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 624 } 625 626 /* Map v4 address to v4-mapped v6 address */ 627 static inline void sctp_v4_map_v6(union sctp_addr *addr) 628 { 629 addr->v6.sin6_family = AF_INET6; 630 addr->v6.sin6_port = addr->v4.sin_port; 631 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 632 addr->v6.sin6_addr.s6_addr32[0] = 0; 633 addr->v6.sin6_addr.s6_addr32[1] = 0; 634 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 635 } 636 637 #endif /* __net_sctp_h__ */ 638