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 #include <linux/types.h> 66 #include <linux/slab.h> 67 #include <linux/in.h> 68 #include <linux/tty.h> 69 #include <linux/proc_fs.h> 70 #include <linux/spinlock.h> 71 #include <linux/jiffies.h> 72 #include <linux/idr.h> 73 74 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 75 #include <net/ipv6.h> 76 #include <net/ip6_route.h> 77 #endif 78 79 #include <asm/uaccess.h> 80 #include <asm/page.h> 81 #include <net/sock.h> 82 #include <net/snmp.h> 83 #include <net/sctp/structs.h> 84 #include <net/sctp/constants.h> 85 86 87 /* Set SCTP_DEBUG flag via config if not already set. */ 88 #ifndef SCTP_DEBUG 89 #ifdef CONFIG_SCTP_DBG_MSG 90 #define SCTP_DEBUG 1 91 #else 92 #define SCTP_DEBUG 0 93 #endif /* CONFIG_SCTP_DBG */ 94 #endif /* SCTP_DEBUG */ 95 96 #ifdef CONFIG_IP_SCTP_MODULE 97 #define SCTP_PROTOSW_FLAG 0 98 #else /* static! */ 99 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 100 #endif 101 102 103 /* Certain internal static functions need to be exported when 104 * compiled into the test frame. 105 */ 106 #ifndef SCTP_STATIC 107 #define SCTP_STATIC static 108 #endif 109 110 /* 111 * Function declarations. 112 */ 113 114 /* 115 * sctp/protocol.c 116 */ 117 extern struct sock *sctp_get_ctl_sock(void); 118 extern void sctp_local_addr_free(struct rcu_head *head); 119 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *, 120 sctp_scope_t, gfp_t gfp, 121 int flags); 122 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 123 extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 124 125 /* 126 * sctp/socket.c 127 */ 128 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 129 int sctp_inet_listen(struct socket *sock, int backlog); 130 void sctp_write_space(struct sock *sk); 131 unsigned int sctp_poll(struct file *file, struct socket *sock, 132 poll_table *wait); 133 void sctp_sock_rfree(struct sk_buff *skb); 134 void sctp_copy_sock(struct sock *newsk, struct sock *sk, 135 struct sctp_association *asoc); 136 extern struct percpu_counter sctp_sockets_allocated; 137 138 /* 139 * sctp/primitive.c 140 */ 141 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); 142 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); 143 int sctp_primitive_ABORT(struct sctp_association *, void *arg); 144 int sctp_primitive_SEND(struct sctp_association *, void *arg); 145 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); 146 int sctp_primitive_ASCONF(struct sctp_association *, void *arg); 147 148 /* 149 * sctp/input.c 150 */ 151 int sctp_rcv(struct sk_buff *skb); 152 void sctp_v4_err(struct sk_buff *skb, u32 info); 153 void sctp_hash_established(struct sctp_association *); 154 void sctp_unhash_established(struct sctp_association *); 155 void sctp_hash_endpoint(struct sctp_endpoint *); 156 void sctp_unhash_endpoint(struct sctp_endpoint *); 157 struct sock *sctp_err_lookup(int family, struct sk_buff *, 158 struct sctphdr *, struct sctp_association **, 159 struct sctp_transport **); 160 void sctp_err_finish(struct sock *, struct sctp_association *); 161 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 162 struct sctp_transport *t, __u32 pmtu); 163 void sctp_icmp_proto_unreachable(struct sock *sk, 164 struct sctp_association *asoc, 165 struct sctp_transport *t); 166 void sctp_backlog_migrate(struct sctp_association *assoc, 167 struct sock *oldsk, struct sock *newsk); 168 169 /* 170 * sctp/proc.c 171 */ 172 int sctp_snmp_proc_init(void); 173 void sctp_snmp_proc_exit(void); 174 int sctp_eps_proc_init(void); 175 void sctp_eps_proc_exit(void); 176 int sctp_assocs_proc_init(void); 177 void sctp_assocs_proc_exit(void); 178 int sctp_remaddr_proc_init(void); 179 void sctp_remaddr_proc_exit(void); 180 181 182 /* 183 * Module global variables 184 */ 185 186 /* 187 * sctp/protocol.c 188 */ 189 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 190 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 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) 219 220 /* SCTP SNMP MIB stats handlers */ 221 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 222 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 223 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 224 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 225 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 226 227 #endif /* !TEST_FRAME */ 228 229 /* sctp mib definitions */ 230 enum { 231 SCTP_MIB_NUM = 0, 232 SCTP_MIB_CURRESTAB, /* CurrEstab */ 233 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 234 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 235 SCTP_MIB_ABORTEDS, /* Aborteds */ 236 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 237 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 238 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 239 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 240 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 241 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 242 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 243 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 244 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 245 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 246 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 247 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 248 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 249 SCTP_MIB_T1_INIT_EXPIREDS, 250 SCTP_MIB_T1_COOKIE_EXPIREDS, 251 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 252 SCTP_MIB_T3_RTX_EXPIREDS, 253 SCTP_MIB_T4_RTO_EXPIREDS, 254 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 255 SCTP_MIB_DELAY_SACK_EXPIREDS, 256 SCTP_MIB_AUTOCLOSE_EXPIREDS, 257 SCTP_MIB_T1_RETRANSMITS, 258 SCTP_MIB_T3_RETRANSMITS, 259 SCTP_MIB_PMTUD_RETRANSMITS, 260 SCTP_MIB_FAST_RETRANSMITS, 261 SCTP_MIB_IN_PKT_SOFTIRQ, 262 SCTP_MIB_IN_PKT_BACKLOG, 263 SCTP_MIB_IN_PKT_DISCARDS, 264 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 265 __SCTP_MIB_MAX 266 }; 267 268 #define SCTP_MIB_MAX __SCTP_MIB_MAX 269 struct sctp_mib { 270 unsigned long mibs[SCTP_MIB_MAX]; 271 } __SNMP_MIB_ALIGN__; 272 273 274 /* Print debugging messages. */ 275 #if SCTP_DEBUG 276 extern int sctp_debug_flag; 277 #define SCTP_DEBUG_PRINTK(whatever...) \ 278 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 279 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 280 if (sctp_debug_flag) { \ 281 if (saddr->sa.sa_family == AF_INET6) { \ 282 printk(KERN_DEBUG \ 283 lead "%pI6" trail, \ 284 leadparm, \ 285 &saddr->v6.sin6_addr, \ 286 otherparms); \ 287 } else { \ 288 printk(KERN_DEBUG \ 289 lead "%pI4" trail, \ 290 leadparm, \ 291 &saddr->v4.sin_addr.s_addr, \ 292 otherparms); \ 293 } \ 294 } 295 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 296 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 297 298 #define SCTP_ASSERT(expr, str, func) \ 299 if (!(expr)) { \ 300 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 301 str, (#expr), __FILE__, __func__, __LINE__); \ 302 func; \ 303 } 304 305 #else /* SCTP_DEBUG */ 306 307 #define SCTP_DEBUG_PRINTK(whatever...) 308 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 309 #define SCTP_ENABLE_DEBUG 310 #define SCTP_DISABLE_DEBUG 311 #define SCTP_ASSERT(expr, str, func) 312 313 #endif /* SCTP_DEBUG */ 314 315 316 /* 317 * Macros for keeping a global reference of object allocations. 318 */ 319 #ifdef CONFIG_SCTP_DBG_OBJCNT 320 321 extern atomic_t sctp_dbg_objcnt_sock; 322 extern atomic_t sctp_dbg_objcnt_ep; 323 extern atomic_t sctp_dbg_objcnt_assoc; 324 extern atomic_t sctp_dbg_objcnt_transport; 325 extern atomic_t sctp_dbg_objcnt_chunk; 326 extern atomic_t sctp_dbg_objcnt_bind_addr; 327 extern atomic_t sctp_dbg_objcnt_bind_bucket; 328 extern atomic_t sctp_dbg_objcnt_addr; 329 extern atomic_t sctp_dbg_objcnt_ssnmap; 330 extern atomic_t sctp_dbg_objcnt_datamsg; 331 extern atomic_t sctp_dbg_objcnt_keys; 332 333 /* Macros to atomically increment/decrement objcnt counters. */ 334 #define SCTP_DBG_OBJCNT_INC(name) \ 335 atomic_inc(&sctp_dbg_objcnt_## name) 336 #define SCTP_DBG_OBJCNT_DEC(name) \ 337 atomic_dec(&sctp_dbg_objcnt_## name) 338 #define SCTP_DBG_OBJCNT(name) \ 339 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 340 341 /* Macro to help create new entries in in the global array of 342 * objcnt counters. 343 */ 344 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 345 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 346 347 void sctp_dbg_objcnt_init(void); 348 void sctp_dbg_objcnt_exit(void); 349 350 #else 351 352 #define SCTP_DBG_OBJCNT_INC(name) 353 #define SCTP_DBG_OBJCNT_DEC(name) 354 355 static inline void sctp_dbg_objcnt_init(void) { return; } 356 static inline void sctp_dbg_objcnt_exit(void) { return; } 357 358 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 359 360 #if defined CONFIG_SYSCTL 361 void sctp_sysctl_register(void); 362 void sctp_sysctl_unregister(void); 363 #else 364 static inline void sctp_sysctl_register(void) { return; } 365 static inline void sctp_sysctl_unregister(void) { return; } 366 #endif 367 368 /* Size of Supported Address Parameter for 'x' address types. */ 369 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 370 371 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 372 373 void sctp_v6_pf_init(void); 374 void sctp_v6_pf_exit(void); 375 int sctp_v6_protosw_init(void); 376 void sctp_v6_protosw_exit(void); 377 int sctp_v6_add_protocol(void); 378 void sctp_v6_del_protocol(void); 379 380 #else /* #ifdef defined(CONFIG_IPV6) */ 381 382 static inline void sctp_v6_pf_init(void) { return; } 383 static inline void sctp_v6_pf_exit(void) { return; } 384 static inline int sctp_v6_protosw_init(void) { return 0; } 385 static inline void sctp_v6_protosw_exit(void) { return; } 386 static inline int sctp_v6_add_protocol(void) { return 0; } 387 static inline void sctp_v6_del_protocol(void) { return; } 388 389 #endif /* #if defined(CONFIG_IPV6) */ 390 391 392 /* Map an association to an assoc_id. */ 393 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 394 { 395 return (asoc?asoc->assoc_id:0); 396 } 397 398 /* Look up the association by its id. */ 399 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 400 401 402 /* A macro to walk a list of skbs. */ 403 #define sctp_skb_for_each(pos, head, tmp) \ 404 skb_queue_walk_safe(head, pos, tmp) 405 406 /* A helper to append an entire skb list (list) to another (head). */ 407 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 408 struct sk_buff_head *head) 409 { 410 unsigned long flags; 411 412 sctp_spin_lock_irqsave(&head->lock, flags); 413 sctp_spin_lock(&list->lock); 414 415 skb_queue_splice_tail_init(list, head); 416 417 sctp_spin_unlock(&list->lock); 418 sctp_spin_unlock_irqrestore(&head->lock, flags); 419 } 420 421 /** 422 * sctp_list_dequeue - remove from the head of the queue 423 * @list: list to dequeue from 424 * 425 * Remove the head of the list. The head item is 426 * returned or %NULL if the list is empty. 427 */ 428 429 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 430 { 431 struct list_head *result = NULL; 432 433 if (list->next != list) { 434 result = list->next; 435 list->next = result->next; 436 list->next->prev = list; 437 INIT_LIST_HEAD(result); 438 } 439 return result; 440 } 441 442 /* SCTP version of skb_set_owner_r. We need this one because 443 * of the way we have to do receive buffer accounting on bundled 444 * chunks. 445 */ 446 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 447 { 448 struct sctp_ulpevent *event = sctp_skb2event(skb); 449 450 skb_orphan(skb); 451 skb->sk = sk; 452 skb->destructor = sctp_sock_rfree; 453 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 454 /* 455 * This mimics the behavior of skb_set_owner_r 456 */ 457 sk->sk_forward_alloc -= event->rmem_len; 458 } 459 460 /* Tests if the list has one and only one entry. */ 461 static inline int sctp_list_single_entry(struct list_head *head) 462 { 463 return ((head->next != head) && (head->next == head->prev)); 464 } 465 466 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 467 static inline __s32 sctp_jitter(__u32 rto) 468 { 469 static __u32 sctp_rand; 470 __s32 ret; 471 472 /* Avoid divide by zero. */ 473 if (!rto) 474 rto = 1; 475 476 sctp_rand += jiffies; 477 sctp_rand ^= (sctp_rand << 12); 478 sctp_rand ^= (sctp_rand >> 20); 479 480 /* Choose random number from 0 to rto, then move to -50% ~ +50% 481 * of rto. 482 */ 483 ret = sctp_rand % rto - (rto >> 1); 484 return ret; 485 } 486 487 /* Break down data chunks at this point. */ 488 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 489 { 490 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 491 int frag = pmtu; 492 493 frag -= sp->pf->af->net_header_len; 494 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 495 496 if (asoc->user_frag) 497 frag = min_t(int, frag, asoc->user_frag); 498 499 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 500 501 return frag; 502 } 503 504 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc) 505 { 506 507 sctp_assoc_sync_pmtu(asoc); 508 asoc->pmtu_pending = 0; 509 } 510 511 /* Walk through a list of TLV parameters. Don't trust the 512 * individual parameter lengths and instead depend on 513 * the chunk length to indicate when to stop. Make sure 514 * there is room for a param header too. 515 */ 516 #define sctp_walk_params(pos, chunk, member)\ 517 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 518 519 #define _sctp_walk_params(pos, chunk, end, member)\ 520 for (pos.v = chunk->member;\ 521 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 522 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 523 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 524 pos.v += WORD_ROUND(ntohs(pos.p->length))) 525 526 #define sctp_walk_errors(err, chunk_hdr)\ 527 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 528 529 #define _sctp_walk_errors(err, chunk_hdr, end)\ 530 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 531 sizeof(sctp_chunkhdr_t));\ 532 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 533 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 534 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 535 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 536 537 #define sctp_walk_fwdtsn(pos, chunk)\ 538 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 539 540 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 541 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 542 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 543 pos++) 544 545 /* Round an int up to the next multiple of 4. */ 546 #define WORD_ROUND(s) (((s)+3)&~3) 547 548 /* Make a new instance of type. */ 549 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 550 551 /* Compare two timevals. */ 552 #define tv_lt(s, t) \ 553 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 554 555 /* Add tv1 to tv2. */ 556 #define TIMEVAL_ADD(tv1, tv2) \ 557 ({ \ 558 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 559 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 560 \ 561 if (usecs >= 1000000) { \ 562 usecs -= 1000000; \ 563 secs++; \ 564 } \ 565 (tv2).tv_sec = secs; \ 566 (tv2).tv_usec = usecs; \ 567 }) 568 569 /* External references. */ 570 571 extern struct proto sctp_prot; 572 extern struct proto sctpv6_prot; 573 extern struct proc_dir_entry *proc_net_sctp; 574 void sctp_put_port(struct sock *sk); 575 576 extern struct idr sctp_assocs_id; 577 extern spinlock_t sctp_assocs_id_lock; 578 579 /* Static inline functions. */ 580 581 /* Convert from an IP version number to an Address Family symbol. */ 582 static inline int ipver2af(__u8 ipver) 583 { 584 switch (ipver) { 585 case 4: 586 return AF_INET; 587 case 6: 588 return AF_INET6; 589 default: 590 return 0; 591 }; 592 } 593 594 /* Convert from an address parameter type to an address family. */ 595 static inline int param_type2af(__be16 type) 596 { 597 switch (type) { 598 case SCTP_PARAM_IPV4_ADDRESS: 599 return AF_INET; 600 case SCTP_PARAM_IPV6_ADDRESS: 601 return AF_INET6; 602 default: 603 return 0; 604 }; 605 } 606 607 /* Perform some sanity checks. */ 608 static inline int sctp_sanity_check(void) 609 { 610 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 611 sizeof(((struct sk_buff *)0)->cb), 612 "SCTP: ulpevent does not fit in skb!\n", return 0); 613 614 return 1; 615 } 616 617 /* Warning: The following hash functions assume a power of two 'size'. */ 618 /* This is the hash function for the SCTP port hash table. */ 619 static inline int sctp_phashfn(__u16 lport) 620 { 621 return (lport & (sctp_port_hashsize - 1)); 622 } 623 624 /* This is the hash function for the endpoint hash table. */ 625 static inline int sctp_ep_hashfn(__u16 lport) 626 { 627 return (lport & (sctp_ep_hashsize - 1)); 628 } 629 630 /* This is the hash function for the association hash table. */ 631 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 632 { 633 int h = (lport << 16) + rport; 634 h ^= h>>8; 635 return (h & (sctp_assoc_hashsize - 1)); 636 } 637 638 /* This is the hash function for the association hash table. This is 639 * not used yet, but could be used as a better hash function when 640 * we have a vtag. 641 */ 642 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 643 { 644 int h = (lport << 16) + rport; 645 h ^= vtag; 646 return (h & (sctp_assoc_hashsize-1)); 647 } 648 649 #define sctp_for_each_hentry(epb, node, head) \ 650 hlist_for_each_entry(epb, node, head, node) 651 652 /* Is a socket of this style? */ 653 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 654 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 655 { 656 return sctp_sk(sk)->type == style; 657 } 658 659 /* Is the association in this state? */ 660 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 661 static inline int __sctp_state(const struct sctp_association *asoc, 662 sctp_state_t state) 663 { 664 return asoc->state == state; 665 } 666 667 /* Is the socket in this state? */ 668 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 669 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 670 { 671 return sk->sk_state == state; 672 } 673 674 /* Map v4-mapped v6 address back to v4 address */ 675 static inline void sctp_v6_map_v4(union sctp_addr *addr) 676 { 677 addr->v4.sin_family = AF_INET; 678 addr->v4.sin_port = addr->v6.sin6_port; 679 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 680 } 681 682 /* Map v4 address to v4-mapped v6 address */ 683 static inline void sctp_v4_map_v6(union sctp_addr *addr) 684 { 685 addr->v6.sin6_family = AF_INET6; 686 addr->v6.sin6_port = addr->v4.sin_port; 687 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 688 addr->v6.sin6_addr.s6_addr32[0] = 0; 689 addr->v6.sin6_addr.s6_addr32[1] = 0; 690 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 691 } 692 693 #endif /* __net_sctp_h__ */ 694