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, unsigned int __nocast 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_endpoint **, 171 struct sctp_association **, 172 struct sctp_transport **); 173 void sctp_err_finish(struct sock *, struct sctp_endpoint *, 174 struct sctp_association *); 175 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 176 struct sctp_transport *t, __u32 pmtu); 177 void sctp_icmp_proto_unreachable(struct sock *sk, 178 struct sctp_endpoint *ep, 179 struct sctp_association *asoc, 180 struct sctp_transport *t); 181 182 /* 183 * Section: Macros, externs, and inlines 184 */ 185 186 187 #ifdef TEST_FRAME 188 #include <test_frame.h> 189 #else 190 191 /* spin lock wrappers. */ 192 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 193 #define sctp_spin_unlock_irqrestore(lock, flags) \ 194 spin_unlock_irqrestore(lock, flags) 195 #define sctp_local_bh_disable() local_bh_disable() 196 #define sctp_local_bh_enable() local_bh_enable() 197 #define sctp_spin_lock(lock) spin_lock(lock) 198 #define sctp_spin_unlock(lock) spin_unlock(lock) 199 #define sctp_write_lock(lock) write_lock(lock) 200 #define sctp_write_unlock(lock) write_unlock(lock) 201 #define sctp_read_lock(lock) read_lock(lock) 202 #define sctp_read_unlock(lock) read_unlock(lock) 203 204 /* sock lock wrappers. */ 205 #define sctp_lock_sock(sk) lock_sock(sk) 206 #define sctp_release_sock(sk) release_sock(sk) 207 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 208 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 209 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) 210 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) 211 212 /* SCTP SNMP MIB stats handlers */ 213 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 214 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 215 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 216 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 217 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 218 219 #endif /* !TEST_FRAME */ 220 221 222 /* Print debugging messages. */ 223 #if SCTP_DEBUG 224 extern int sctp_debug_flag; 225 #define SCTP_DEBUG_PRINTK(whatever...) \ 226 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 227 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 228 if (sctp_debug_flag) { \ 229 if (saddr->sa.sa_family == AF_INET6) { \ 230 printk(KERN_DEBUG \ 231 lead "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" trail, \ 232 leadparm, \ 233 NIP6(saddr->v6.sin6_addr), \ 234 otherparms); \ 235 } else { \ 236 printk(KERN_DEBUG \ 237 lead "%u.%u.%u.%u" trail, \ 238 leadparm, \ 239 NIPQUAD(saddr->v4.sin_addr.s_addr), \ 240 otherparms); \ 241 } \ 242 } 243 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 244 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 245 246 #define SCTP_ASSERT(expr, str, func) \ 247 if (!(expr)) { \ 248 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 249 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ 250 func; \ 251 } 252 253 #else /* SCTP_DEBUG */ 254 255 #define SCTP_DEBUG_PRINTK(whatever...) 256 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 257 #define SCTP_ENABLE_DEBUG 258 #define SCTP_DISABLE_DEBUG 259 #define SCTP_ASSERT(expr, str, func) 260 261 #endif /* SCTP_DEBUG */ 262 263 264 /* 265 * Macros for keeping a global reference of object allocations. 266 */ 267 #ifdef CONFIG_SCTP_DBG_OBJCNT 268 269 extern atomic_t sctp_dbg_objcnt_sock; 270 extern atomic_t sctp_dbg_objcnt_ep; 271 extern atomic_t sctp_dbg_objcnt_assoc; 272 extern atomic_t sctp_dbg_objcnt_transport; 273 extern atomic_t sctp_dbg_objcnt_chunk; 274 extern atomic_t sctp_dbg_objcnt_bind_addr; 275 extern atomic_t sctp_dbg_objcnt_bind_bucket; 276 extern atomic_t sctp_dbg_objcnt_addr; 277 extern atomic_t sctp_dbg_objcnt_ssnmap; 278 extern atomic_t sctp_dbg_objcnt_datamsg; 279 280 /* Macros to atomically increment/decrement objcnt counters. */ 281 #define SCTP_DBG_OBJCNT_INC(name) \ 282 atomic_inc(&sctp_dbg_objcnt_## name) 283 #define SCTP_DBG_OBJCNT_DEC(name) \ 284 atomic_dec(&sctp_dbg_objcnt_## name) 285 #define SCTP_DBG_OBJCNT(name) \ 286 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 287 288 /* Macro to help create new entries in in the global array of 289 * objcnt counters. 290 */ 291 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 292 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 293 294 void sctp_dbg_objcnt_init(void); 295 void sctp_dbg_objcnt_exit(void); 296 297 #else 298 299 #define SCTP_DBG_OBJCNT_INC(name) 300 #define SCTP_DBG_OBJCNT_DEC(name) 301 302 static inline void sctp_dbg_objcnt_init(void) { return; } 303 static inline void sctp_dbg_objcnt_exit(void) { return; } 304 305 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 306 307 #if defined CONFIG_SYSCTL 308 void sctp_sysctl_register(void); 309 void sctp_sysctl_unregister(void); 310 #else 311 static inline void sctp_sysctl_register(void) { return; } 312 static inline void sctp_sysctl_unregister(void) { return; } 313 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen, 314 void __user *oldval, size_t __user *oldlenp, 315 void __user *newval, size_t newlen, void **context) { 316 return -ENOSYS; 317 } 318 #endif 319 320 /* Size of Supported Address Parameter for 'x' address types. */ 321 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 322 323 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 324 325 int sctp_v6_init(void); 326 void sctp_v6_exit(void); 327 328 #else /* #ifdef defined(CONFIG_IPV6) */ 329 330 static inline int sctp_v6_init(void) { return 0; } 331 static inline void sctp_v6_exit(void) { return; } 332 333 #endif /* #if defined(CONFIG_IPV6) */ 334 335 /* Some wrappers, in case crypto not available. */ 336 #if defined (CONFIG_CRYPTO_HMAC) 337 #define sctp_crypto_alloc_tfm crypto_alloc_tfm 338 #define sctp_crypto_free_tfm crypto_free_tfm 339 #define sctp_crypto_hmac crypto_hmac 340 #else 341 #define sctp_crypto_alloc_tfm(x...) NULL 342 #define sctp_crypto_free_tfm(x...) 343 #define sctp_crypto_hmac(x...) 344 #endif 345 346 347 /* Map an association to an assoc_id. */ 348 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 349 { 350 return (asoc?asoc->assoc_id:0); 351 } 352 353 /* Look up the association by its id. */ 354 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 355 356 357 /* A macro to walk a list of skbs. */ 358 #define sctp_skb_for_each(pos, head, tmp) \ 359 for (pos = (head)->next;\ 360 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ 361 pos = tmp) 362 363 364 /* A helper to append an entire skb list (list) to another (head). */ 365 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 366 struct sk_buff_head *head) 367 { 368 unsigned long flags; 369 370 sctp_spin_lock_irqsave(&head->lock, flags); 371 sctp_spin_lock(&list->lock); 372 373 list_splice((struct list_head *)list, (struct list_head *)head->prev); 374 375 head->qlen += list->qlen; 376 list->qlen = 0; 377 378 sctp_spin_unlock(&list->lock); 379 sctp_spin_unlock_irqrestore(&head->lock, flags); 380 } 381 382 /** 383 * sctp_list_dequeue - remove from the head of the queue 384 * @list: list to dequeue from 385 * 386 * Remove the head of the list. The head item is 387 * returned or %NULL if the list is empty. 388 */ 389 390 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 391 { 392 struct list_head *result = NULL; 393 394 if (list->next != list) { 395 result = list->next; 396 list->next = result->next; 397 list->next->prev = list; 398 INIT_LIST_HEAD(result); 399 } 400 return result; 401 } 402 403 /* Tests if the list has one and only one entry. */ 404 static inline int sctp_list_single_entry(struct list_head *head) 405 { 406 return ((head->next != head) && (head->next == head->prev)); 407 } 408 409 /* Calculate the size (in bytes) occupied by the data of an iovec. */ 410 static inline size_t get_user_iov_size(struct iovec *iov, int iovlen) 411 { 412 size_t retval = 0; 413 414 for (; iovlen > 0; --iovlen) { 415 retval += iov->iov_len; 416 iov++; 417 } 418 419 return retval; 420 } 421 422 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 423 static inline __s32 sctp_jitter(__u32 rto) 424 { 425 static __u32 sctp_rand; 426 __s32 ret; 427 428 /* Avoid divide by zero. */ 429 if (!rto) 430 rto = 1; 431 432 sctp_rand += jiffies; 433 sctp_rand ^= (sctp_rand << 12); 434 sctp_rand ^= (sctp_rand >> 20); 435 436 /* Choose random number from 0 to rto, then move to -50% ~ +50% 437 * of rto. 438 */ 439 ret = sctp_rand % rto - (rto >> 1); 440 return ret; 441 } 442 443 /* Break down data chunks at this point. */ 444 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 445 { 446 int frag = pmtu; 447 448 frag -= sp->pf->af->net_header_len; 449 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 450 451 if (sp->user_frag) 452 frag = min_t(int, frag, sp->user_frag); 453 454 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 455 456 return frag; 457 } 458 459 /* Walk through a list of TLV parameters. Don't trust the 460 * individual parameter lengths and instead depend on 461 * the chunk length to indicate when to stop. Make sure 462 * there is room for a param header too. 463 */ 464 #define sctp_walk_params(pos, chunk, member)\ 465 _sctp_walk_params((pos), (chunk), WORD_ROUND(ntohs((chunk)->chunk_hdr.length)), member) 466 467 #define _sctp_walk_params(pos, chunk, end, member)\ 468 for (pos.v = chunk->member;\ 469 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 470 pos.v <= (void *)chunk + end - WORD_ROUND(ntohs(pos.p->length)) &&\ 471 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 472 pos.v += WORD_ROUND(ntohs(pos.p->length))) 473 474 #define sctp_walk_errors(err, chunk_hdr)\ 475 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 476 477 #define _sctp_walk_errors(err, chunk_hdr, end)\ 478 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 479 sizeof(sctp_chunkhdr_t));\ 480 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 481 (void *)err <= (void *)chunk_hdr + end - WORD_ROUND(ntohs(err->length)) &&\ 482 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 483 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 484 485 #define sctp_walk_fwdtsn(pos, chunk)\ 486 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 487 488 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 489 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 490 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 491 pos++) 492 493 /* Round an int up to the next multiple of 4. */ 494 #define WORD_ROUND(s) (((s)+3)&~3) 495 496 /* Make a new instance of type. */ 497 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 498 499 /* Compare two timevals. */ 500 #define tv_lt(s, t) \ 501 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 502 503 /* Add tv1 to tv2. */ 504 #define TIMEVAL_ADD(tv1, tv2) \ 505 ({ \ 506 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 507 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 508 \ 509 if (usecs >= 1000000) { \ 510 usecs -= 1000000; \ 511 secs++; \ 512 } \ 513 (tv2).tv_sec = secs; \ 514 (tv2).tv_usec = usecs; \ 515 }) 516 517 /* External references. */ 518 519 extern struct proto sctp_prot; 520 extern struct proto sctpv6_prot; 521 extern struct proc_dir_entry *proc_net_sctp; 522 void sctp_put_port(struct sock *sk); 523 524 extern struct idr sctp_assocs_id; 525 extern spinlock_t sctp_assocs_id_lock; 526 527 /* Static inline functions. */ 528 529 /* Convert from an IP version number to an Address Family symbol. */ 530 static inline int ipver2af(__u8 ipver) 531 { 532 switch (ipver) { 533 case 4: 534 return AF_INET; 535 case 6: 536 return AF_INET6; 537 default: 538 return 0; 539 }; 540 } 541 542 /* Convert from an address parameter type to an address family. */ 543 static inline int param_type2af(__u16 type) 544 { 545 switch (type) { 546 case SCTP_PARAM_IPV4_ADDRESS: 547 return AF_INET; 548 case SCTP_PARAM_IPV6_ADDRESS: 549 return AF_INET6; 550 default: 551 return 0; 552 }; 553 } 554 555 /* Perform some sanity checks. */ 556 static inline int sctp_sanity_check(void) 557 { 558 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 559 sizeof(((struct sk_buff *)0)->cb), 560 "SCTP: ulpevent does not fit in skb!\n", return 0); 561 562 return 1; 563 } 564 565 /* Warning: The following hash functions assume a power of two 'size'. */ 566 /* This is the hash function for the SCTP port hash table. */ 567 static inline int sctp_phashfn(__u16 lport) 568 { 569 return (lport & (sctp_port_hashsize - 1)); 570 } 571 572 /* This is the hash function for the endpoint hash table. */ 573 static inline int sctp_ep_hashfn(__u16 lport) 574 { 575 return (lport & (sctp_ep_hashsize - 1)); 576 } 577 578 /* This is the hash function for the association hash table. */ 579 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 580 { 581 int h = (lport << 16) + rport; 582 h ^= h>>8; 583 return (h & (sctp_assoc_hashsize - 1)); 584 } 585 586 /* This is the hash function for the association hash table. This is 587 * not used yet, but could be used as a better hash function when 588 * we have a vtag. 589 */ 590 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 591 { 592 int h = (lport << 16) + rport; 593 h ^= vtag; 594 return (h & (sctp_assoc_hashsize-1)); 595 } 596 597 /* Is a socket of this style? */ 598 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 599 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 600 { 601 return sctp_sk(sk)->type == style; 602 } 603 604 /* Is the association in this state? */ 605 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 606 static inline int __sctp_state(const struct sctp_association *asoc, 607 sctp_state_t state) 608 { 609 return asoc->state == state; 610 } 611 612 /* Is the socket in this state? */ 613 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 614 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 615 { 616 return sk->sk_state == state; 617 } 618 619 /* Map v4-mapped v6 address back to v4 address */ 620 static inline void sctp_v6_map_v4(union sctp_addr *addr) 621 { 622 addr->v4.sin_family = AF_INET; 623 addr->v4.sin_port = addr->v6.sin6_port; 624 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 625 } 626 627 /* Map v4 address to v4-mapped v6 address */ 628 static inline void sctp_v4_map_v6(union sctp_addr *addr) 629 { 630 addr->v6.sin6_family = AF_INET6; 631 addr->v6.sin6_port = addr->v4.sin_port; 632 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 633 addr->v6.sin6_addr.s6_addr32[0] = 0; 634 addr->v6.sin6_addr.s6_addr32[1] = 0; 635 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 636 } 637 638 #endif /* __net_sctp_h__ */ 639