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