1 /* SCTP kernel 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 implementation 8 * 9 * The base lksctp header. 10 * 11 * This SCTP 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 * This SCTP 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_SCTP_DBG_OBJCNT 69 #undef CONFIG_SYSCTL 70 #endif /* TEST_FRAME */ 71 72 #include <linux/types.h> 73 #include <linux/slab.h> 74 #include <linux/in.h> 75 #include <linux/tty.h> 76 #include <linux/proc_fs.h> 77 #include <linux/spinlock.h> 78 #include <linux/jiffies.h> 79 #include <linux/idr.h> 80 81 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 82 #include <net/ipv6.h> 83 #include <net/ip6_route.h> 84 #endif 85 86 #include <asm/uaccess.h> 87 #include <asm/page.h> 88 #include <net/sock.h> 89 #include <net/snmp.h> 90 #include <net/sctp/structs.h> 91 #include <net/sctp/constants.h> 92 93 94 /* Set SCTP_DEBUG flag via config if not already set. */ 95 #ifndef SCTP_DEBUG 96 #ifdef CONFIG_SCTP_DBG_MSG 97 #define SCTP_DEBUG 1 98 #else 99 #define SCTP_DEBUG 0 100 #endif /* CONFIG_SCTP_DBG */ 101 #endif /* SCTP_DEBUG */ 102 103 #ifdef CONFIG_IP_SCTP_MODULE 104 #define SCTP_PROTOSW_FLAG 0 105 #else /* static! */ 106 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 107 #endif 108 109 110 /* Certain internal static functions need to be exported when 111 * compiled into the test frame. 112 */ 113 #ifndef SCTP_STATIC 114 #define SCTP_STATIC static 115 #endif 116 117 /* 118 * Function declarations. 119 */ 120 121 /* 122 * sctp/protocol.c 123 */ 124 extern struct sock *sctp_get_ctl_sock(void); 125 extern void sctp_local_addr_free(struct rcu_head *head); 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/input.c 154 */ 155 int sctp_rcv(struct sk_buff *skb); 156 void sctp_v4_err(struct sk_buff *skb, u32 info); 157 void sctp_hash_established(struct sctp_association *); 158 void sctp_unhash_established(struct sctp_association *); 159 void sctp_hash_endpoint(struct sctp_endpoint *); 160 void sctp_unhash_endpoint(struct sctp_endpoint *); 161 struct sock *sctp_err_lookup(int family, struct sk_buff *, 162 struct sctphdr *, struct sctp_association **, 163 struct sctp_transport **); 164 void sctp_err_finish(struct sock *, struct sctp_association *); 165 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 166 struct sctp_transport *t, __u32 pmtu); 167 void sctp_icmp_proto_unreachable(struct sock *sk, 168 struct sctp_association *asoc, 169 struct sctp_transport *t); 170 void sctp_backlog_migrate(struct sctp_association *assoc, 171 struct sock *oldsk, struct sock *newsk); 172 173 /* 174 * sctp/proc.c 175 */ 176 int sctp_snmp_proc_init(void); 177 void sctp_snmp_proc_exit(void); 178 int sctp_eps_proc_init(void); 179 void sctp_eps_proc_exit(void); 180 int sctp_assocs_proc_init(void); 181 void sctp_assocs_proc_exit(void); 182 183 184 /* 185 * Module global variables 186 */ 187 188 /* 189 * sctp/protocol.c 190 */ 191 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 192 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 193 194 /* 195 * Section: Macros, externs, and inlines 196 */ 197 198 199 #ifdef TEST_FRAME 200 #include <test_frame.h> 201 #else 202 203 /* spin lock wrappers. */ 204 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 205 #define sctp_spin_unlock_irqrestore(lock, flags) \ 206 spin_unlock_irqrestore(lock, flags) 207 #define sctp_local_bh_disable() local_bh_disable() 208 #define sctp_local_bh_enable() local_bh_enable() 209 #define sctp_spin_lock(lock) spin_lock(lock) 210 #define sctp_spin_unlock(lock) spin_unlock(lock) 211 #define sctp_write_lock(lock) write_lock(lock) 212 #define sctp_write_unlock(lock) write_unlock(lock) 213 #define sctp_read_lock(lock) read_lock(lock) 214 #define sctp_read_unlock(lock) read_unlock(lock) 215 216 /* sock lock wrappers. */ 217 #define sctp_lock_sock(sk) lock_sock(sk) 218 #define sctp_release_sock(sk) release_sock(sk) 219 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 220 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 221 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) 222 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) 223 224 /* SCTP SNMP MIB stats handlers */ 225 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 226 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 227 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 228 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 229 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 230 231 #endif /* !TEST_FRAME */ 232 233 /* sctp mib definitions */ 234 enum 235 { 236 SCTP_MIB_NUM = 0, 237 SCTP_MIB_CURRESTAB, /* CurrEstab */ 238 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 239 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 240 SCTP_MIB_ABORTEDS, /* Aborteds */ 241 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 242 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 243 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 244 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 245 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 246 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 247 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 248 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 249 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 250 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 251 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 252 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 253 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 254 SCTP_MIB_T1_INIT_EXPIREDS, 255 SCTP_MIB_T1_COOKIE_EXPIREDS, 256 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 257 SCTP_MIB_T3_RTX_EXPIREDS, 258 SCTP_MIB_T4_RTO_EXPIREDS, 259 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 260 SCTP_MIB_DELAY_SACK_EXPIREDS, 261 SCTP_MIB_AUTOCLOSE_EXPIREDS, 262 SCTP_MIB_T1_RETRANSMITS, 263 SCTP_MIB_T3_RETRANSMITS, 264 SCTP_MIB_PMTUD_RETRANSMITS, 265 SCTP_MIB_FAST_RETRANSMITS, 266 SCTP_MIB_IN_PKT_SOFTIRQ, 267 SCTP_MIB_IN_PKT_BACKLOG, 268 SCTP_MIB_IN_PKT_DISCARDS, 269 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 270 __SCTP_MIB_MAX 271 }; 272 273 #define SCTP_MIB_MAX __SCTP_MIB_MAX 274 struct sctp_mib { 275 unsigned long mibs[SCTP_MIB_MAX]; 276 } __SNMP_MIB_ALIGN__; 277 278 279 /* Print debugging messages. */ 280 #if SCTP_DEBUG 281 extern int sctp_debug_flag; 282 #define SCTP_DEBUG_PRINTK(whatever...) \ 283 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 284 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 285 if (sctp_debug_flag) { \ 286 if (saddr->sa.sa_family == AF_INET6) { \ 287 printk(KERN_DEBUG \ 288 lead NIP6_FMT trail, \ 289 leadparm, \ 290 NIP6(saddr->v6.sin6_addr), \ 291 otherparms); \ 292 } else { \ 293 printk(KERN_DEBUG \ 294 lead NIPQUAD_FMT trail, \ 295 leadparm, \ 296 NIPQUAD(saddr->v4.sin_addr.s_addr), \ 297 otherparms); \ 298 } \ 299 } 300 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 301 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 302 303 #define SCTP_ASSERT(expr, str, func) \ 304 if (!(expr)) { \ 305 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 306 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ 307 func; \ 308 } 309 310 #else /* SCTP_DEBUG */ 311 312 #define SCTP_DEBUG_PRINTK(whatever...) 313 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 314 #define SCTP_ENABLE_DEBUG 315 #define SCTP_DISABLE_DEBUG 316 #define SCTP_ASSERT(expr, str, func) 317 318 #endif /* SCTP_DEBUG */ 319 320 321 /* 322 * Macros for keeping a global reference of object allocations. 323 */ 324 #ifdef CONFIG_SCTP_DBG_OBJCNT 325 326 extern atomic_t sctp_dbg_objcnt_sock; 327 extern atomic_t sctp_dbg_objcnt_ep; 328 extern atomic_t sctp_dbg_objcnt_assoc; 329 extern atomic_t sctp_dbg_objcnt_transport; 330 extern atomic_t sctp_dbg_objcnt_chunk; 331 extern atomic_t sctp_dbg_objcnt_bind_addr; 332 extern atomic_t sctp_dbg_objcnt_bind_bucket; 333 extern atomic_t sctp_dbg_objcnt_addr; 334 extern atomic_t sctp_dbg_objcnt_ssnmap; 335 extern atomic_t sctp_dbg_objcnt_datamsg; 336 extern atomic_t sctp_dbg_objcnt_keys; 337 338 /* Macros to atomically increment/decrement objcnt counters. */ 339 #define SCTP_DBG_OBJCNT_INC(name) \ 340 atomic_inc(&sctp_dbg_objcnt_## name) 341 #define SCTP_DBG_OBJCNT_DEC(name) \ 342 atomic_dec(&sctp_dbg_objcnt_## name) 343 #define SCTP_DBG_OBJCNT(name) \ 344 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 345 346 /* Macro to help create new entries in in the global array of 347 * objcnt counters. 348 */ 349 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 350 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 351 352 void sctp_dbg_objcnt_init(void); 353 void sctp_dbg_objcnt_exit(void); 354 355 #else 356 357 #define SCTP_DBG_OBJCNT_INC(name) 358 #define SCTP_DBG_OBJCNT_DEC(name) 359 360 static inline void sctp_dbg_objcnt_init(void) { return; } 361 static inline void sctp_dbg_objcnt_exit(void) { return; } 362 363 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 364 365 #if defined CONFIG_SYSCTL 366 void sctp_sysctl_register(void); 367 void sctp_sysctl_unregister(void); 368 #else 369 static inline void sctp_sysctl_register(void) { return; } 370 static inline void sctp_sysctl_unregister(void) { return; } 371 #endif 372 373 /* Size of Supported Address Parameter for 'x' address types. */ 374 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 375 376 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 377 378 void sctp_v6_pf_init(void); 379 void sctp_v6_pf_exit(void); 380 int sctp_v6_protosw_init(void); 381 void sctp_v6_protosw_exit(void); 382 int sctp_v6_add_protocol(void); 383 void sctp_v6_del_protocol(void); 384 385 #else /* #ifdef defined(CONFIG_IPV6) */ 386 387 static inline void sctp_v6_pf_init(void) { return; } 388 static inline void sctp_v6_pf_exit(void) { return; } 389 static inline int sctp_v6_protosw_init(void) { return 0; } 390 static inline void sctp_v6_protosw_exit(void) { return; } 391 static inline int sctp_v6_add_protocol(void) { return 0; } 392 static inline void sctp_v6_del_protocol(void) { return; } 393 394 #endif /* #if defined(CONFIG_IPV6) */ 395 396 397 /* Map an association to an assoc_id. */ 398 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 399 { 400 return (asoc?asoc->assoc_id:0); 401 } 402 403 /* Look up the association by its id. */ 404 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 405 406 407 /* A macro to walk a list of skbs. */ 408 #define sctp_skb_for_each(pos, head, tmp) \ 409 for (pos = (head)->next;\ 410 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ 411 pos = tmp) 412 413 414 /* A helper to append an entire skb list (list) to another (head). */ 415 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 416 struct sk_buff_head *head) 417 { 418 unsigned long flags; 419 420 sctp_spin_lock_irqsave(&head->lock, flags); 421 sctp_spin_lock(&list->lock); 422 423 list_splice((struct list_head *)list, (struct list_head *)head->prev); 424 425 head->qlen += list->qlen; 426 list->qlen = 0; 427 428 sctp_spin_unlock(&list->lock); 429 sctp_spin_unlock_irqrestore(&head->lock, flags); 430 } 431 432 /** 433 * sctp_list_dequeue - remove from the head of the queue 434 * @list: list to dequeue from 435 * 436 * Remove the head of the list. The head item is 437 * returned or %NULL if the list is empty. 438 */ 439 440 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 441 { 442 struct list_head *result = NULL; 443 444 if (list->next != list) { 445 result = list->next; 446 list->next = result->next; 447 list->next->prev = list; 448 INIT_LIST_HEAD(result); 449 } 450 return result; 451 } 452 453 /* SCTP version of skb_set_owner_r. We need this one because 454 * of the way we have to do receive buffer accounting on bundled 455 * chunks. 456 */ 457 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 458 { 459 struct sctp_ulpevent *event = sctp_skb2event(skb); 460 461 skb->sk = sk; 462 skb->destructor = sctp_sock_rfree; 463 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 464 /* 465 * This mimics the behavior of skb_set_owner_r 466 */ 467 sk->sk_forward_alloc -= event->rmem_len; 468 } 469 470 /* Tests if the list has one and only one entry. */ 471 static inline int sctp_list_single_entry(struct list_head *head) 472 { 473 return ((head->next != head) && (head->next == head->prev)); 474 } 475 476 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 477 static inline __s32 sctp_jitter(__u32 rto) 478 { 479 static __u32 sctp_rand; 480 __s32 ret; 481 482 /* Avoid divide by zero. */ 483 if (!rto) 484 rto = 1; 485 486 sctp_rand += jiffies; 487 sctp_rand ^= (sctp_rand << 12); 488 sctp_rand ^= (sctp_rand >> 20); 489 490 /* Choose random number from 0 to rto, then move to -50% ~ +50% 491 * of rto. 492 */ 493 ret = sctp_rand % rto - (rto >> 1); 494 return ret; 495 } 496 497 /* Break down data chunks at this point. */ 498 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 499 { 500 int frag = pmtu; 501 502 frag -= sp->pf->af->net_header_len; 503 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 504 505 if (sp->user_frag) 506 frag = min_t(int, frag, sp->user_frag); 507 508 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 509 510 return frag; 511 } 512 513 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc) 514 { 515 516 sctp_assoc_sync_pmtu(asoc); 517 asoc->pmtu_pending = 0; 518 } 519 520 /* Walk through a list of TLV parameters. Don't trust the 521 * individual parameter lengths and instead depend on 522 * the chunk length to indicate when to stop. Make sure 523 * there is room for a param header too. 524 */ 525 #define sctp_walk_params(pos, chunk, member)\ 526 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 527 528 #define _sctp_walk_params(pos, chunk, end, member)\ 529 for (pos.v = chunk->member;\ 530 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 531 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 532 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 533 pos.v += WORD_ROUND(ntohs(pos.p->length))) 534 535 #define sctp_walk_errors(err, chunk_hdr)\ 536 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 537 538 #define _sctp_walk_errors(err, chunk_hdr, end)\ 539 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 540 sizeof(sctp_chunkhdr_t));\ 541 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 542 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 543 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 544 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 545 546 #define sctp_walk_fwdtsn(pos, chunk)\ 547 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 548 549 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 550 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 551 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 552 pos++) 553 554 /* Round an int up to the next multiple of 4. */ 555 #define WORD_ROUND(s) (((s)+3)&~3) 556 557 /* Make a new instance of type. */ 558 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 559 560 /* Compare two timevals. */ 561 #define tv_lt(s, t) \ 562 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 563 564 /* Add tv1 to tv2. */ 565 #define TIMEVAL_ADD(tv1, tv2) \ 566 ({ \ 567 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 568 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 569 \ 570 if (usecs >= 1000000) { \ 571 usecs -= 1000000; \ 572 secs++; \ 573 } \ 574 (tv2).tv_sec = secs; \ 575 (tv2).tv_usec = usecs; \ 576 }) 577 578 /* External references. */ 579 580 extern struct proto sctp_prot; 581 extern struct proto sctpv6_prot; 582 extern struct proc_dir_entry *proc_net_sctp; 583 void sctp_put_port(struct sock *sk); 584 585 extern struct idr sctp_assocs_id; 586 extern spinlock_t sctp_assocs_id_lock; 587 588 /* Static inline functions. */ 589 590 /* Convert from an IP version number to an Address Family symbol. */ 591 static inline int ipver2af(__u8 ipver) 592 { 593 switch (ipver) { 594 case 4: 595 return AF_INET; 596 case 6: 597 return AF_INET6; 598 default: 599 return 0; 600 }; 601 } 602 603 /* Convert from an address parameter type to an address family. */ 604 static inline int param_type2af(__be16 type) 605 { 606 switch (type) { 607 case SCTP_PARAM_IPV4_ADDRESS: 608 return AF_INET; 609 case SCTP_PARAM_IPV6_ADDRESS: 610 return AF_INET6; 611 default: 612 return 0; 613 }; 614 } 615 616 /* Perform some sanity checks. */ 617 static inline int sctp_sanity_check(void) 618 { 619 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 620 sizeof(((struct sk_buff *)0)->cb), 621 "SCTP: ulpevent does not fit in skb!\n", return 0); 622 623 return 1; 624 } 625 626 /* Warning: The following hash functions assume a power of two 'size'. */ 627 /* This is the hash function for the SCTP port hash table. */ 628 static inline int sctp_phashfn(__u16 lport) 629 { 630 return (lport & (sctp_port_hashsize - 1)); 631 } 632 633 /* This is the hash function for the endpoint hash table. */ 634 static inline int sctp_ep_hashfn(__u16 lport) 635 { 636 return (lport & (sctp_ep_hashsize - 1)); 637 } 638 639 /* This is the hash function for the association hash table. */ 640 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 641 { 642 int h = (lport << 16) + rport; 643 h ^= h>>8; 644 return (h & (sctp_assoc_hashsize - 1)); 645 } 646 647 /* This is the hash function for the association hash table. This is 648 * not used yet, but could be used as a better hash function when 649 * we have a vtag. 650 */ 651 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 652 { 653 int h = (lport << 16) + rport; 654 h ^= vtag; 655 return (h & (sctp_assoc_hashsize-1)); 656 } 657 658 #define sctp_for_each_hentry(epb, node, head) \ 659 hlist_for_each_entry(epb, node, head, node) 660 661 /* Is a socket of this style? */ 662 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 663 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 664 { 665 return sctp_sk(sk)->type == style; 666 } 667 668 /* Is the association in this state? */ 669 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 670 static inline int __sctp_state(const struct sctp_association *asoc, 671 sctp_state_t state) 672 { 673 return asoc->state == state; 674 } 675 676 /* Is the socket in this state? */ 677 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 678 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 679 { 680 return sk->sk_state == state; 681 } 682 683 /* Map v4-mapped v6 address back to v4 address */ 684 static inline void sctp_v6_map_v4(union sctp_addr *addr) 685 { 686 addr->v4.sin_family = AF_INET; 687 addr->v4.sin_port = addr->v6.sin6_port; 688 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 689 } 690 691 /* Map v4 address to v4-mapped v6 address */ 692 static inline void sctp_v4_map_v6(union sctp_addr *addr) 693 { 694 addr->v6.sin6_family = AF_INET6; 695 addr->v6.sin6_port = addr->v4.sin_port; 696 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 697 addr->v6.sin6_addr.s6_addr32[0] = 0; 698 addr->v6.sin6_addr.s6_addr32[1] = 0; 699 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 700 } 701 702 #endif /* __net_sctp_h__ */ 703