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 void sctp_local_addr_free(struct rcu_head *head); 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 void sctp_sock_rfree(struct sk_buff *skb); 142 143 /* 144 * sctp/primitive.c 145 */ 146 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); 147 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); 148 int sctp_primitive_ABORT(struct sctp_association *, void *arg); 149 int sctp_primitive_SEND(struct sctp_association *, void *arg); 150 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); 151 int sctp_primitive_ASCONF(struct sctp_association *, void *arg); 152 153 /* 154 * sctp/crc32c.c 155 */ 156 __u32 sctp_start_cksum(__u8 *ptr, __u16 count); 157 __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum); 158 __u32 sctp_end_cksum(__u32 cksum); 159 __u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum); 160 161 /* 162 * sctp/input.c 163 */ 164 int sctp_rcv(struct sk_buff *skb); 165 void sctp_v4_err(struct sk_buff *skb, u32 info); 166 void sctp_hash_established(struct sctp_association *); 167 void sctp_unhash_established(struct sctp_association *); 168 void sctp_hash_endpoint(struct sctp_endpoint *); 169 void sctp_unhash_endpoint(struct sctp_endpoint *); 170 struct sock *sctp_err_lookup(int family, struct sk_buff *, 171 struct sctphdr *, struct sctp_association **, 172 struct sctp_transport **); 173 void sctp_err_finish(struct sock *, struct sctp_association *); 174 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 175 struct sctp_transport *t, __u32 pmtu); 176 void sctp_icmp_proto_unreachable(struct sock *sk, 177 struct sctp_association *asoc, 178 struct sctp_transport *t); 179 void sctp_backlog_migrate(struct sctp_association *assoc, 180 struct sock *oldsk, struct sock *newsk); 181 182 /* 183 * sctp/proc.c 184 */ 185 int sctp_snmp_proc_init(void); 186 void sctp_snmp_proc_exit(void); 187 int sctp_eps_proc_init(void); 188 void sctp_eps_proc_exit(void); 189 int sctp_assocs_proc_init(void); 190 void sctp_assocs_proc_exit(void); 191 192 193 /* 194 * Module global variables 195 */ 196 197 /* 198 * sctp/protocol.c 199 */ 200 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 201 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 202 203 /* 204 * Section: Macros, externs, and inlines 205 */ 206 207 208 #ifdef TEST_FRAME 209 #include <test_frame.h> 210 #else 211 212 /* spin lock wrappers. */ 213 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 214 #define sctp_spin_unlock_irqrestore(lock, flags) \ 215 spin_unlock_irqrestore(lock, flags) 216 #define sctp_local_bh_disable() local_bh_disable() 217 #define sctp_local_bh_enable() local_bh_enable() 218 #define sctp_spin_lock(lock) spin_lock(lock) 219 #define sctp_spin_unlock(lock) spin_unlock(lock) 220 #define sctp_write_lock(lock) write_lock(lock) 221 #define sctp_write_unlock(lock) write_unlock(lock) 222 #define sctp_read_lock(lock) read_lock(lock) 223 #define sctp_read_unlock(lock) read_unlock(lock) 224 225 /* sock lock wrappers. */ 226 #define sctp_lock_sock(sk) lock_sock(sk) 227 #define sctp_release_sock(sk) release_sock(sk) 228 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 229 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 230 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) 231 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) 232 233 /* SCTP SNMP MIB stats handlers */ 234 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 235 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 236 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 237 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 238 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 239 240 #endif /* !TEST_FRAME */ 241 242 /* sctp mib definitions */ 243 enum 244 { 245 SCTP_MIB_NUM = 0, 246 SCTP_MIB_CURRESTAB, /* CurrEstab */ 247 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 248 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 249 SCTP_MIB_ABORTEDS, /* Aborteds */ 250 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 251 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 252 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 253 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 254 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 255 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 256 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 257 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 258 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 259 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 260 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 261 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 262 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 263 SCTP_MIB_T1_INIT_EXPIREDS, 264 SCTP_MIB_T1_COOKIE_EXPIREDS, 265 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 266 SCTP_MIB_T3_RTX_EXPIREDS, 267 SCTP_MIB_T4_RTO_EXPIREDS, 268 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 269 SCTP_MIB_DELAY_SACK_EXPIREDS, 270 SCTP_MIB_AUTOCLOSE_EXPIREDS, 271 SCTP_MIB_T3_RETRANSMITS, 272 SCTP_MIB_PMTUD_RETRANSMITS, 273 SCTP_MIB_FAST_RETRANSMITS, 274 SCTP_MIB_IN_PKT_SOFTIRQ, 275 SCTP_MIB_IN_PKT_BACKLOG, 276 SCTP_MIB_IN_PKT_DISCARDS, 277 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 278 __SCTP_MIB_MAX 279 }; 280 281 #define SCTP_MIB_MAX __SCTP_MIB_MAX 282 struct sctp_mib { 283 unsigned long mibs[SCTP_MIB_MAX]; 284 } __SNMP_MIB_ALIGN__; 285 286 287 /* Print debugging messages. */ 288 #if SCTP_DEBUG 289 extern int sctp_debug_flag; 290 #define SCTP_DEBUG_PRINTK(whatever...) \ 291 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 292 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 293 if (sctp_debug_flag) { \ 294 if (saddr->sa.sa_family == AF_INET6) { \ 295 printk(KERN_DEBUG \ 296 lead NIP6_FMT trail, \ 297 leadparm, \ 298 NIP6(saddr->v6.sin6_addr), \ 299 otherparms); \ 300 } else { \ 301 printk(KERN_DEBUG \ 302 lead NIPQUAD_FMT trail, \ 303 leadparm, \ 304 NIPQUAD(saddr->v4.sin_addr.s_addr), \ 305 otherparms); \ 306 } \ 307 } 308 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 309 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 310 311 #define SCTP_ASSERT(expr, str, func) \ 312 if (!(expr)) { \ 313 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 314 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ 315 func; \ 316 } 317 318 #else /* SCTP_DEBUG */ 319 320 #define SCTP_DEBUG_PRINTK(whatever...) 321 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 322 #define SCTP_ENABLE_DEBUG 323 #define SCTP_DISABLE_DEBUG 324 #define SCTP_ASSERT(expr, str, func) 325 326 #endif /* SCTP_DEBUG */ 327 328 329 /* 330 * Macros for keeping a global reference of object allocations. 331 */ 332 #ifdef CONFIG_SCTP_DBG_OBJCNT 333 334 extern atomic_t sctp_dbg_objcnt_sock; 335 extern atomic_t sctp_dbg_objcnt_ep; 336 extern atomic_t sctp_dbg_objcnt_assoc; 337 extern atomic_t sctp_dbg_objcnt_transport; 338 extern atomic_t sctp_dbg_objcnt_chunk; 339 extern atomic_t sctp_dbg_objcnt_bind_addr; 340 extern atomic_t sctp_dbg_objcnt_bind_bucket; 341 extern atomic_t sctp_dbg_objcnt_addr; 342 extern atomic_t sctp_dbg_objcnt_ssnmap; 343 extern atomic_t sctp_dbg_objcnt_datamsg; 344 extern atomic_t sctp_dbg_objcnt_keys; 345 346 /* Macros to atomically increment/decrement objcnt counters. */ 347 #define SCTP_DBG_OBJCNT_INC(name) \ 348 atomic_inc(&sctp_dbg_objcnt_## name) 349 #define SCTP_DBG_OBJCNT_DEC(name) \ 350 atomic_dec(&sctp_dbg_objcnt_## name) 351 #define SCTP_DBG_OBJCNT(name) \ 352 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 353 354 /* Macro to help create new entries in in the global array of 355 * objcnt counters. 356 */ 357 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 358 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 359 360 void sctp_dbg_objcnt_init(void); 361 void sctp_dbg_objcnt_exit(void); 362 363 #else 364 365 #define SCTP_DBG_OBJCNT_INC(name) 366 #define SCTP_DBG_OBJCNT_DEC(name) 367 368 static inline void sctp_dbg_objcnt_init(void) { return; } 369 static inline void sctp_dbg_objcnt_exit(void) { return; } 370 371 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 372 373 #if defined CONFIG_SYSCTL 374 void sctp_sysctl_register(void); 375 void sctp_sysctl_unregister(void); 376 #else 377 static inline void sctp_sysctl_register(void) { return; } 378 static inline void sctp_sysctl_unregister(void) { return; } 379 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen, 380 void __user *oldval, size_t __user *oldlenp, 381 void __user *newval, size_t newlen) { 382 return -ENOSYS; 383 } 384 #endif 385 386 /* Size of Supported Address Parameter for 'x' address types. */ 387 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 388 389 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 390 391 int sctp_v6_init(void); 392 void sctp_v6_exit(void); 393 int sctp_v6_add_protocol(void); 394 void sctp_v6_del_protocol(void); 395 396 #else /* #ifdef defined(CONFIG_IPV6) */ 397 398 static inline int sctp_v6_init(void) { return 0; } 399 static inline void sctp_v6_exit(void) { return; } 400 static inline int sctp_v6_add_protocol(void) { return 0; } 401 static inline void sctp_v6_del_protocol(void) { return; } 402 403 #endif /* #if defined(CONFIG_IPV6) */ 404 405 406 /* Map an association to an assoc_id. */ 407 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 408 { 409 return (asoc?asoc->assoc_id:0); 410 } 411 412 /* Look up the association by its id. */ 413 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 414 415 416 /* A macro to walk a list of skbs. */ 417 #define sctp_skb_for_each(pos, head, tmp) \ 418 for (pos = (head)->next;\ 419 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ 420 pos = tmp) 421 422 423 /* A helper to append an entire skb list (list) to another (head). */ 424 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 425 struct sk_buff_head *head) 426 { 427 unsigned long flags; 428 429 sctp_spin_lock_irqsave(&head->lock, flags); 430 sctp_spin_lock(&list->lock); 431 432 list_splice((struct list_head *)list, (struct list_head *)head->prev); 433 434 head->qlen += list->qlen; 435 list->qlen = 0; 436 437 sctp_spin_unlock(&list->lock); 438 sctp_spin_unlock_irqrestore(&head->lock, flags); 439 } 440 441 /** 442 * sctp_list_dequeue - remove from the head of the queue 443 * @list: list to dequeue from 444 * 445 * Remove the head of the list. The head item is 446 * returned or %NULL if the list is empty. 447 */ 448 449 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 450 { 451 struct list_head *result = NULL; 452 453 if (list->next != list) { 454 result = list->next; 455 list->next = result->next; 456 list->next->prev = list; 457 INIT_LIST_HEAD(result); 458 } 459 return result; 460 } 461 462 /* SCTP version of skb_set_owner_r. We need this one because 463 * of the way we have to do receive buffer accounting on bundled 464 * chunks. 465 */ 466 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 467 { 468 struct sctp_ulpevent *event = sctp_skb2event(skb); 469 470 skb->sk = sk; 471 skb->destructor = sctp_sock_rfree; 472 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 473 /* 474 * This mimics the behavior of 475 * sk_stream_set_owner_r 476 */ 477 sk->sk_forward_alloc -= event->rmem_len; 478 } 479 480 /* Tests if the list has one and only one entry. */ 481 static inline int sctp_list_single_entry(struct list_head *head) 482 { 483 return ((head->next != head) && (head->next == head->prev)); 484 } 485 486 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 487 static inline __s32 sctp_jitter(__u32 rto) 488 { 489 static __u32 sctp_rand; 490 __s32 ret; 491 492 /* Avoid divide by zero. */ 493 if (!rto) 494 rto = 1; 495 496 sctp_rand += jiffies; 497 sctp_rand ^= (sctp_rand << 12); 498 sctp_rand ^= (sctp_rand >> 20); 499 500 /* Choose random number from 0 to rto, then move to -50% ~ +50% 501 * of rto. 502 */ 503 ret = sctp_rand % rto - (rto >> 1); 504 return ret; 505 } 506 507 /* Break down data chunks at this point. */ 508 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 509 { 510 int frag = pmtu; 511 512 frag -= sp->pf->af->net_header_len; 513 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 514 515 if (sp->user_frag) 516 frag = min_t(int, frag, sp->user_frag); 517 518 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 519 520 return frag; 521 } 522 523 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc) 524 { 525 526 sctp_assoc_sync_pmtu(asoc); 527 asoc->pmtu_pending = 0; 528 } 529 530 /* Walk through a list of TLV parameters. Don't trust the 531 * individual parameter lengths and instead depend on 532 * the chunk length to indicate when to stop. Make sure 533 * there is room for a param header too. 534 */ 535 #define sctp_walk_params(pos, chunk, member)\ 536 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 537 538 #define _sctp_walk_params(pos, chunk, end, member)\ 539 for (pos.v = chunk->member;\ 540 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 541 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 542 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 543 pos.v += WORD_ROUND(ntohs(pos.p->length))) 544 545 #define sctp_walk_errors(err, chunk_hdr)\ 546 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 547 548 #define _sctp_walk_errors(err, chunk_hdr, end)\ 549 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 550 sizeof(sctp_chunkhdr_t));\ 551 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 552 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 553 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 554 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 555 556 #define sctp_walk_fwdtsn(pos, chunk)\ 557 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 558 559 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 560 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 561 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 562 pos++) 563 564 /* Round an int up to the next multiple of 4. */ 565 #define WORD_ROUND(s) (((s)+3)&~3) 566 567 /* Make a new instance of type. */ 568 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 569 570 /* Compare two timevals. */ 571 #define tv_lt(s, t) \ 572 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 573 574 /* Add tv1 to tv2. */ 575 #define TIMEVAL_ADD(tv1, tv2) \ 576 ({ \ 577 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 578 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 579 \ 580 if (usecs >= 1000000) { \ 581 usecs -= 1000000; \ 582 secs++; \ 583 } \ 584 (tv2).tv_sec = secs; \ 585 (tv2).tv_usec = usecs; \ 586 }) 587 588 /* External references. */ 589 590 extern struct proto sctp_prot; 591 extern struct proto sctpv6_prot; 592 extern struct proc_dir_entry *proc_net_sctp; 593 void sctp_put_port(struct sock *sk); 594 595 extern struct idr sctp_assocs_id; 596 extern spinlock_t sctp_assocs_id_lock; 597 598 /* Static inline functions. */ 599 600 /* Convert from an IP version number to an Address Family symbol. */ 601 static inline int ipver2af(__u8 ipver) 602 { 603 switch (ipver) { 604 case 4: 605 return AF_INET; 606 case 6: 607 return AF_INET6; 608 default: 609 return 0; 610 }; 611 } 612 613 /* Convert from an address parameter type to an address family. */ 614 static inline int param_type2af(__be16 type) 615 { 616 switch (type) { 617 case SCTP_PARAM_IPV4_ADDRESS: 618 return AF_INET; 619 case SCTP_PARAM_IPV6_ADDRESS: 620 return AF_INET6; 621 default: 622 return 0; 623 }; 624 } 625 626 /* Perform some sanity checks. */ 627 static inline int sctp_sanity_check(void) 628 { 629 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 630 sizeof(((struct sk_buff *)0)->cb), 631 "SCTP: ulpevent does not fit in skb!\n", return 0); 632 633 return 1; 634 } 635 636 /* Warning: The following hash functions assume a power of two 'size'. */ 637 /* This is the hash function for the SCTP port hash table. */ 638 static inline int sctp_phashfn(__u16 lport) 639 { 640 return (lport & (sctp_port_hashsize - 1)); 641 } 642 643 /* This is the hash function for the endpoint hash table. */ 644 static inline int sctp_ep_hashfn(__u16 lport) 645 { 646 return (lport & (sctp_ep_hashsize - 1)); 647 } 648 649 /* This is the hash function for the association hash table. */ 650 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 651 { 652 int h = (lport << 16) + rport; 653 h ^= h>>8; 654 return (h & (sctp_assoc_hashsize - 1)); 655 } 656 657 /* This is the hash function for the association hash table. This is 658 * not used yet, but could be used as a better hash function when 659 * we have a vtag. 660 */ 661 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 662 { 663 int h = (lport << 16) + rport; 664 h ^= vtag; 665 return (h & (sctp_assoc_hashsize-1)); 666 } 667 668 /* Is a socket of this style? */ 669 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 670 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 671 { 672 return sctp_sk(sk)->type == style; 673 } 674 675 /* Is the association in this state? */ 676 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 677 static inline int __sctp_state(const struct sctp_association *asoc, 678 sctp_state_t state) 679 { 680 return asoc->state == state; 681 } 682 683 /* Is the socket in this state? */ 684 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 685 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 686 { 687 return sk->sk_state == state; 688 } 689 690 /* Map v4-mapped v6 address back to v4 address */ 691 static inline void sctp_v6_map_v4(union sctp_addr *addr) 692 { 693 addr->v4.sin_family = AF_INET; 694 addr->v4.sin_port = addr->v6.sin6_port; 695 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 696 } 697 698 /* Map v4 address to v4-mapped v6 address */ 699 static inline void sctp_v4_map_v6(union sctp_addr *addr) 700 { 701 addr->v6.sin6_family = AF_INET6; 702 addr->v6.sin6_port = addr->v4.sin_port; 703 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 704 addr->v6.sin6_addr.s6_addr32[0] = 0; 705 addr->v6.sin6_addr.s6_addr32[1] = 0; 706 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 707 } 708 709 #endif /* __net_sctp_h__ */ 710