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 void sctp_sock_rfree(struct sk_buff *skb); 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 * sctp/proc.c 183 */ 184 int sctp_snmp_proc_init(void); 185 void sctp_snmp_proc_exit(void); 186 int sctp_eps_proc_init(void); 187 void sctp_eps_proc_exit(void); 188 int sctp_assocs_proc_init(void); 189 void sctp_assocs_proc_exit(void); 190 191 192 /* 193 * Section: Macros, externs, and inlines 194 */ 195 196 197 #ifdef TEST_FRAME 198 #include <test_frame.h> 199 #else 200 201 /* spin lock wrappers. */ 202 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 203 #define sctp_spin_unlock_irqrestore(lock, flags) \ 204 spin_unlock_irqrestore(lock, flags) 205 #define sctp_local_bh_disable() local_bh_disable() 206 #define sctp_local_bh_enable() local_bh_enable() 207 #define sctp_spin_lock(lock) spin_lock(lock) 208 #define sctp_spin_unlock(lock) spin_unlock(lock) 209 #define sctp_write_lock(lock) write_lock(lock) 210 #define sctp_write_unlock(lock) write_unlock(lock) 211 #define sctp_read_lock(lock) read_lock(lock) 212 #define sctp_read_unlock(lock) read_unlock(lock) 213 214 /* sock lock wrappers. */ 215 #define sctp_lock_sock(sk) lock_sock(sk) 216 #define sctp_release_sock(sk) release_sock(sk) 217 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 218 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 219 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) 220 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) 221 222 /* SCTP SNMP MIB stats handlers */ 223 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 224 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 225 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 226 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 227 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 228 229 #endif /* !TEST_FRAME */ 230 231 /* sctp mib definitions */ 232 enum 233 { 234 SCTP_MIB_NUM = 0, 235 SCTP_MIB_CURRESTAB, /* CurrEstab */ 236 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 237 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 238 SCTP_MIB_ABORTEDS, /* Aborteds */ 239 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 240 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 241 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 242 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 243 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 244 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 245 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 246 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 247 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 248 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 249 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 250 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 251 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 252 SCTP_MIB_T1_INIT_EXPIREDS, 253 SCTP_MIB_T1_COOKIE_EXPIREDS, 254 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 255 SCTP_MIB_T3_RTX_EXPIREDS, 256 SCTP_MIB_T4_RTO_EXPIREDS, 257 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 258 SCTP_MIB_DELAY_SACK_EXPIREDS, 259 SCTP_MIB_AUTOCLOSE_EXPIREDS, 260 SCTP_MIB_T3_RETRANSMITS, 261 SCTP_MIB_PMTUD_RETRANSMITS, 262 SCTP_MIB_FAST_RETRANSMITS, 263 SCTP_MIB_IN_PKT_SOFTIRQ, 264 SCTP_MIB_IN_PKT_BACKLOG, 265 SCTP_MIB_IN_PKT_DISCARDS, 266 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 267 __SCTP_MIB_MAX 268 }; 269 270 #define SCTP_MIB_MAX __SCTP_MIB_MAX 271 struct sctp_mib { 272 unsigned long mibs[SCTP_MIB_MAX]; 273 } __SNMP_MIB_ALIGN__; 274 275 276 /* Print debugging messages. */ 277 #if SCTP_DEBUG 278 extern int sctp_debug_flag; 279 #define SCTP_DEBUG_PRINTK(whatever...) \ 280 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 281 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 282 if (sctp_debug_flag) { \ 283 if (saddr->sa.sa_family == AF_INET6) { \ 284 printk(KERN_DEBUG \ 285 lead NIP6_FMT trail, \ 286 leadparm, \ 287 NIP6(saddr->v6.sin6_addr), \ 288 otherparms); \ 289 } else { \ 290 printk(KERN_DEBUG \ 291 lead NIPQUAD_FMT trail, \ 292 leadparm, \ 293 NIPQUAD(saddr->v4.sin_addr.s_addr), \ 294 otherparms); \ 295 } \ 296 } 297 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 298 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 299 300 #define SCTP_ASSERT(expr, str, func) \ 301 if (!(expr)) { \ 302 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 303 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ 304 func; \ 305 } 306 307 #else /* SCTP_DEBUG */ 308 309 #define SCTP_DEBUG_PRINTK(whatever...) 310 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 311 #define SCTP_ENABLE_DEBUG 312 #define SCTP_DISABLE_DEBUG 313 #define SCTP_ASSERT(expr, str, func) 314 315 #endif /* SCTP_DEBUG */ 316 317 318 /* 319 * Macros for keeping a global reference of object allocations. 320 */ 321 #ifdef CONFIG_SCTP_DBG_OBJCNT 322 323 extern atomic_t sctp_dbg_objcnt_sock; 324 extern atomic_t sctp_dbg_objcnt_ep; 325 extern atomic_t sctp_dbg_objcnt_assoc; 326 extern atomic_t sctp_dbg_objcnt_transport; 327 extern atomic_t sctp_dbg_objcnt_chunk; 328 extern atomic_t sctp_dbg_objcnt_bind_addr; 329 extern atomic_t sctp_dbg_objcnt_bind_bucket; 330 extern atomic_t sctp_dbg_objcnt_addr; 331 extern atomic_t sctp_dbg_objcnt_ssnmap; 332 extern atomic_t sctp_dbg_objcnt_datamsg; 333 334 /* Macros to atomically increment/decrement objcnt counters. */ 335 #define SCTP_DBG_OBJCNT_INC(name) \ 336 atomic_inc(&sctp_dbg_objcnt_## name) 337 #define SCTP_DBG_OBJCNT_DEC(name) \ 338 atomic_dec(&sctp_dbg_objcnt_## name) 339 #define SCTP_DBG_OBJCNT(name) \ 340 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 341 342 /* Macro to help create new entries in in the global array of 343 * objcnt counters. 344 */ 345 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 346 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 347 348 void sctp_dbg_objcnt_init(void); 349 void sctp_dbg_objcnt_exit(void); 350 351 #else 352 353 #define SCTP_DBG_OBJCNT_INC(name) 354 #define SCTP_DBG_OBJCNT_DEC(name) 355 356 static inline void sctp_dbg_objcnt_init(void) { return; } 357 static inline void sctp_dbg_objcnt_exit(void) { return; } 358 359 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 360 361 #if defined CONFIG_SYSCTL 362 void sctp_sysctl_register(void); 363 void sctp_sysctl_unregister(void); 364 #else 365 static inline void sctp_sysctl_register(void) { return; } 366 static inline void sctp_sysctl_unregister(void) { return; } 367 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen, 368 void __user *oldval, size_t __user *oldlenp, 369 void __user *newval, size_t newlen) { 370 return -ENOSYS; 371 } 372 #endif 373 374 /* Size of Supported Address Parameter for 'x' address types. */ 375 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 376 377 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 378 379 int sctp_v6_init(void); 380 void sctp_v6_exit(void); 381 382 #else /* #ifdef defined(CONFIG_IPV6) */ 383 384 static inline int sctp_v6_init(void) { return 0; } 385 static inline void sctp_v6_exit(void) { return; } 386 387 #endif /* #if defined(CONFIG_IPV6) */ 388 389 390 /* Map an association to an assoc_id. */ 391 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 392 { 393 return (asoc?asoc->assoc_id:0); 394 } 395 396 /* Look up the association by its id. */ 397 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 398 399 400 /* A macro to walk a list of skbs. */ 401 #define sctp_skb_for_each(pos, head, tmp) \ 402 for (pos = (head)->next;\ 403 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ 404 pos = tmp) 405 406 407 /* A helper to append an entire skb list (list) to another (head). */ 408 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 409 struct sk_buff_head *head) 410 { 411 unsigned long flags; 412 413 sctp_spin_lock_irqsave(&head->lock, flags); 414 sctp_spin_lock(&list->lock); 415 416 list_splice((struct list_head *)list, (struct list_head *)head->prev); 417 418 head->qlen += list->qlen; 419 list->qlen = 0; 420 421 sctp_spin_unlock(&list->lock); 422 sctp_spin_unlock_irqrestore(&head->lock, flags); 423 } 424 425 /** 426 * sctp_list_dequeue - remove from the head of the queue 427 * @list: list to dequeue from 428 * 429 * Remove the head of the list. The head item is 430 * returned or %NULL if the list is empty. 431 */ 432 433 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 434 { 435 struct list_head *result = NULL; 436 437 if (list->next != list) { 438 result = list->next; 439 list->next = result->next; 440 list->next->prev = list; 441 INIT_LIST_HEAD(result); 442 } 443 return result; 444 } 445 446 /* SCTP version of skb_set_owner_r. We need this one because 447 * of the way we have to do receive buffer accounting on bundled 448 * chunks. 449 */ 450 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 451 { 452 struct sctp_ulpevent *event = sctp_skb2event(skb); 453 454 skb->sk = sk; 455 skb->destructor = sctp_sock_rfree; 456 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 457 } 458 459 /* Tests if the list has one and only one entry. */ 460 static inline int sctp_list_single_entry(struct list_head *head) 461 { 462 return ((head->next != head) && (head->next == head->prev)); 463 } 464 465 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 466 static inline __s32 sctp_jitter(__u32 rto) 467 { 468 static __u32 sctp_rand; 469 __s32 ret; 470 471 /* Avoid divide by zero. */ 472 if (!rto) 473 rto = 1; 474 475 sctp_rand += jiffies; 476 sctp_rand ^= (sctp_rand << 12); 477 sctp_rand ^= (sctp_rand >> 20); 478 479 /* Choose random number from 0 to rto, then move to -50% ~ +50% 480 * of rto. 481 */ 482 ret = sctp_rand % rto - (rto >> 1); 483 return ret; 484 } 485 486 /* Break down data chunks at this point. */ 487 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 488 { 489 int frag = pmtu; 490 491 frag -= sp->pf->af->net_header_len; 492 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 493 494 if (sp->user_frag) 495 frag = min_t(int, frag, sp->user_frag); 496 497 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 498 499 return frag; 500 } 501 502 /* Walk through a list of TLV parameters. Don't trust the 503 * individual parameter lengths and instead depend on 504 * the chunk length to indicate when to stop. Make sure 505 * there is room for a param header too. 506 */ 507 #define sctp_walk_params(pos, chunk, member)\ 508 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 509 510 #define _sctp_walk_params(pos, chunk, end, member)\ 511 for (pos.v = chunk->member;\ 512 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 513 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 514 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 515 pos.v += WORD_ROUND(ntohs(pos.p->length))) 516 517 #define sctp_walk_errors(err, chunk_hdr)\ 518 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 519 520 #define _sctp_walk_errors(err, chunk_hdr, end)\ 521 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 522 sizeof(sctp_chunkhdr_t));\ 523 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 524 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 525 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 526 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 527 528 #define sctp_walk_fwdtsn(pos, chunk)\ 529 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 530 531 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 532 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 533 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 534 pos++) 535 536 /* Round an int up to the next multiple of 4. */ 537 #define WORD_ROUND(s) (((s)+3)&~3) 538 539 /* Make a new instance of type. */ 540 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 541 542 /* Compare two timevals. */ 543 #define tv_lt(s, t) \ 544 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 545 546 /* Add tv1 to tv2. */ 547 #define TIMEVAL_ADD(tv1, tv2) \ 548 ({ \ 549 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 550 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 551 \ 552 if (usecs >= 1000000) { \ 553 usecs -= 1000000; \ 554 secs++; \ 555 } \ 556 (tv2).tv_sec = secs; \ 557 (tv2).tv_usec = usecs; \ 558 }) 559 560 /* External references. */ 561 562 extern struct proto sctp_prot; 563 extern struct proto sctpv6_prot; 564 extern struct proc_dir_entry *proc_net_sctp; 565 void sctp_put_port(struct sock *sk); 566 567 extern struct idr sctp_assocs_id; 568 extern spinlock_t sctp_assocs_id_lock; 569 570 /* Static inline functions. */ 571 572 /* Convert from an IP version number to an Address Family symbol. */ 573 static inline int ipver2af(__u8 ipver) 574 { 575 switch (ipver) { 576 case 4: 577 return AF_INET; 578 case 6: 579 return AF_INET6; 580 default: 581 return 0; 582 }; 583 } 584 585 /* Convert from an address parameter type to an address family. */ 586 static inline int param_type2af(__be16 type) 587 { 588 switch (type) { 589 case SCTP_PARAM_IPV4_ADDRESS: 590 return AF_INET; 591 case SCTP_PARAM_IPV6_ADDRESS: 592 return AF_INET6; 593 default: 594 return 0; 595 }; 596 } 597 598 /* Perform some sanity checks. */ 599 static inline int sctp_sanity_check(void) 600 { 601 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 602 sizeof(((struct sk_buff *)0)->cb), 603 "SCTP: ulpevent does not fit in skb!\n", return 0); 604 605 return 1; 606 } 607 608 /* Warning: The following hash functions assume a power of two 'size'. */ 609 /* This is the hash function for the SCTP port hash table. */ 610 static inline int sctp_phashfn(__u16 lport) 611 { 612 return (lport & (sctp_port_hashsize - 1)); 613 } 614 615 /* This is the hash function for the endpoint hash table. */ 616 static inline int sctp_ep_hashfn(__u16 lport) 617 { 618 return (lport & (sctp_ep_hashsize - 1)); 619 } 620 621 /* This is the hash function for the association hash table. */ 622 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 623 { 624 int h = (lport << 16) + rport; 625 h ^= h>>8; 626 return (h & (sctp_assoc_hashsize - 1)); 627 } 628 629 /* This is the hash function for the association hash table. This is 630 * not used yet, but could be used as a better hash function when 631 * we have a vtag. 632 */ 633 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 634 { 635 int h = (lport << 16) + rport; 636 h ^= vtag; 637 return (h & (sctp_assoc_hashsize-1)); 638 } 639 640 /* Is a socket of this style? */ 641 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 642 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 643 { 644 return sctp_sk(sk)->type == style; 645 } 646 647 /* Is the association in this state? */ 648 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 649 static inline int __sctp_state(const struct sctp_association *asoc, 650 sctp_state_t state) 651 { 652 return asoc->state == state; 653 } 654 655 /* Is the socket in this state? */ 656 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 657 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 658 { 659 return sk->sk_state == state; 660 } 661 662 /* Map v4-mapped v6 address back to v4 address */ 663 static inline void sctp_v6_map_v4(union sctp_addr *addr) 664 { 665 addr->v4.sin_family = AF_INET; 666 addr->v4.sin_port = addr->v6.sin6_port; 667 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 668 } 669 670 /* Map v4 address to v4-mapped v6 address */ 671 static inline void sctp_v4_map_v6(union sctp_addr *addr) 672 { 673 addr->v6.sin6_family = AF_INET6; 674 addr->v6.sin6_port = addr->v4.sin_port; 675 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 676 addr->v6.sin6_addr.s6_addr32[0] = 0; 677 addr->v6.sin6_addr.s6_addr32[1] = 0; 678 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 679 } 680 681 #endif /* __net_sctp_h__ */ 682