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 extern struct percpu_counter sctp_sockets_allocated; 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/input.c 155 */ 156 int sctp_rcv(struct sk_buff *skb); 157 void sctp_v4_err(struct sk_buff *skb, u32 info); 158 void sctp_hash_established(struct sctp_association *); 159 void sctp_unhash_established(struct sctp_association *); 160 void sctp_hash_endpoint(struct sctp_endpoint *); 161 void sctp_unhash_endpoint(struct sctp_endpoint *); 162 struct sock *sctp_err_lookup(int family, struct sk_buff *, 163 struct sctphdr *, struct sctp_association **, 164 struct sctp_transport **); 165 void sctp_err_finish(struct sock *, struct sctp_association *); 166 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 167 struct sctp_transport *t, __u32 pmtu); 168 void sctp_icmp_proto_unreachable(struct sock *sk, 169 struct sctp_association *asoc, 170 struct sctp_transport *t); 171 void sctp_backlog_migrate(struct sctp_association *assoc, 172 struct sock *oldsk, struct sock *newsk); 173 174 /* 175 * sctp/proc.c 176 */ 177 int sctp_snmp_proc_init(void); 178 void sctp_snmp_proc_exit(void); 179 int sctp_eps_proc_init(void); 180 void sctp_eps_proc_exit(void); 181 int sctp_assocs_proc_init(void); 182 void sctp_assocs_proc_exit(void); 183 int sctp_remaddr_proc_init(void); 184 void sctp_remaddr_proc_exit(void); 185 186 187 /* 188 * Module global variables 189 */ 190 191 /* 192 * sctp/protocol.c 193 */ 194 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 195 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 196 197 /* 198 * Section: Macros, externs, and inlines 199 */ 200 201 202 #ifdef TEST_FRAME 203 #include <test_frame.h> 204 #else 205 206 /* spin lock wrappers. */ 207 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 208 #define sctp_spin_unlock_irqrestore(lock, flags) \ 209 spin_unlock_irqrestore(lock, flags) 210 #define sctp_local_bh_disable() local_bh_disable() 211 #define sctp_local_bh_enable() local_bh_enable() 212 #define sctp_spin_lock(lock) spin_lock(lock) 213 #define sctp_spin_unlock(lock) spin_unlock(lock) 214 #define sctp_write_lock(lock) write_lock(lock) 215 #define sctp_write_unlock(lock) write_unlock(lock) 216 #define sctp_read_lock(lock) read_lock(lock) 217 #define sctp_read_unlock(lock) read_unlock(lock) 218 219 /* sock lock wrappers. */ 220 #define sctp_lock_sock(sk) lock_sock(sk) 221 #define sctp_release_sock(sk) release_sock(sk) 222 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 223 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 224 225 /* SCTP SNMP MIB stats handlers */ 226 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 227 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 228 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 229 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 230 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 231 232 #endif /* !TEST_FRAME */ 233 234 /* sctp mib definitions */ 235 enum 236 { 237 SCTP_MIB_NUM = 0, 238 SCTP_MIB_CURRESTAB, /* CurrEstab */ 239 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 240 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 241 SCTP_MIB_ABORTEDS, /* Aborteds */ 242 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 243 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 244 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 245 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 246 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 247 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 248 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 249 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 250 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 251 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 252 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 253 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 254 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 255 SCTP_MIB_T1_INIT_EXPIREDS, 256 SCTP_MIB_T1_COOKIE_EXPIREDS, 257 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 258 SCTP_MIB_T3_RTX_EXPIREDS, 259 SCTP_MIB_T4_RTO_EXPIREDS, 260 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 261 SCTP_MIB_DELAY_SACK_EXPIREDS, 262 SCTP_MIB_AUTOCLOSE_EXPIREDS, 263 SCTP_MIB_T1_RETRANSMITS, 264 SCTP_MIB_T3_RETRANSMITS, 265 SCTP_MIB_PMTUD_RETRANSMITS, 266 SCTP_MIB_FAST_RETRANSMITS, 267 SCTP_MIB_IN_PKT_SOFTIRQ, 268 SCTP_MIB_IN_PKT_BACKLOG, 269 SCTP_MIB_IN_PKT_DISCARDS, 270 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 271 __SCTP_MIB_MAX 272 }; 273 274 #define SCTP_MIB_MAX __SCTP_MIB_MAX 275 struct sctp_mib { 276 unsigned long mibs[SCTP_MIB_MAX]; 277 } __SNMP_MIB_ALIGN__; 278 279 280 /* Print debugging messages. */ 281 #if SCTP_DEBUG 282 extern int sctp_debug_flag; 283 #define SCTP_DEBUG_PRINTK(whatever...) \ 284 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 285 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 286 if (sctp_debug_flag) { \ 287 if (saddr->sa.sa_family == AF_INET6) { \ 288 printk(KERN_DEBUG \ 289 lead "%pI6" trail, \ 290 leadparm, \ 291 &saddr->v6.sin6_addr, \ 292 otherparms); \ 293 } else { \ 294 printk(KERN_DEBUG \ 295 lead "%pI4" trail, \ 296 leadparm, \ 297 &saddr->v4.sin_addr.s_addr, \ 298 otherparms); \ 299 } \ 300 } 301 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 302 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 303 304 #define SCTP_ASSERT(expr, str, func) \ 305 if (!(expr)) { \ 306 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 307 str, (#expr), __FILE__, __func__, __LINE__); \ 308 func; \ 309 } 310 311 #else /* SCTP_DEBUG */ 312 313 #define SCTP_DEBUG_PRINTK(whatever...) 314 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 315 #define SCTP_ENABLE_DEBUG 316 #define SCTP_DISABLE_DEBUG 317 #define SCTP_ASSERT(expr, str, func) 318 319 #endif /* SCTP_DEBUG */ 320 321 322 /* 323 * Macros for keeping a global reference of object allocations. 324 */ 325 #ifdef CONFIG_SCTP_DBG_OBJCNT 326 327 extern atomic_t sctp_dbg_objcnt_sock; 328 extern atomic_t sctp_dbg_objcnt_ep; 329 extern atomic_t sctp_dbg_objcnt_assoc; 330 extern atomic_t sctp_dbg_objcnt_transport; 331 extern atomic_t sctp_dbg_objcnt_chunk; 332 extern atomic_t sctp_dbg_objcnt_bind_addr; 333 extern atomic_t sctp_dbg_objcnt_bind_bucket; 334 extern atomic_t sctp_dbg_objcnt_addr; 335 extern atomic_t sctp_dbg_objcnt_ssnmap; 336 extern atomic_t sctp_dbg_objcnt_datamsg; 337 extern atomic_t sctp_dbg_objcnt_keys; 338 339 /* Macros to atomically increment/decrement objcnt counters. */ 340 #define SCTP_DBG_OBJCNT_INC(name) \ 341 atomic_inc(&sctp_dbg_objcnt_## name) 342 #define SCTP_DBG_OBJCNT_DEC(name) \ 343 atomic_dec(&sctp_dbg_objcnt_## name) 344 #define SCTP_DBG_OBJCNT(name) \ 345 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 346 347 /* Macro to help create new entries in in the global array of 348 * objcnt counters. 349 */ 350 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 351 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 352 353 void sctp_dbg_objcnt_init(void); 354 void sctp_dbg_objcnt_exit(void); 355 356 #else 357 358 #define SCTP_DBG_OBJCNT_INC(name) 359 #define SCTP_DBG_OBJCNT_DEC(name) 360 361 static inline void sctp_dbg_objcnt_init(void) { return; } 362 static inline void sctp_dbg_objcnt_exit(void) { return; } 363 364 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 365 366 #if defined CONFIG_SYSCTL 367 void sctp_sysctl_register(void); 368 void sctp_sysctl_unregister(void); 369 #else 370 static inline void sctp_sysctl_register(void) { return; } 371 static inline void sctp_sysctl_unregister(void) { return; } 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 void sctp_v6_pf_init(void); 380 void sctp_v6_pf_exit(void); 381 int sctp_v6_protosw_init(void); 382 void sctp_v6_protosw_exit(void); 383 int sctp_v6_add_protocol(void); 384 void sctp_v6_del_protocol(void); 385 386 #else /* #ifdef defined(CONFIG_IPV6) */ 387 388 static inline void sctp_v6_pf_init(void) { return; } 389 static inline void sctp_v6_pf_exit(void) { return; } 390 static inline int sctp_v6_protosw_init(void) { return 0; } 391 static inline void sctp_v6_protosw_exit(void) { return; } 392 static inline int sctp_v6_add_protocol(void) { return 0; } 393 static inline void sctp_v6_del_protocol(void) { return; } 394 395 #endif /* #if defined(CONFIG_IPV6) */ 396 397 398 /* Map an association to an assoc_id. */ 399 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 400 { 401 return (asoc?asoc->assoc_id:0); 402 } 403 404 /* Look up the association by its id. */ 405 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 406 407 408 /* A macro to walk a list of skbs. */ 409 #define sctp_skb_for_each(pos, head, tmp) \ 410 skb_queue_walk_safe(head, pos, tmp) 411 412 /* A helper to append an entire skb list (list) to another (head). */ 413 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 414 struct sk_buff_head *head) 415 { 416 unsigned long flags; 417 418 sctp_spin_lock_irqsave(&head->lock, flags); 419 sctp_spin_lock(&list->lock); 420 421 skb_queue_splice_tail_init(list, head); 422 423 sctp_spin_unlock(&list->lock); 424 sctp_spin_unlock_irqrestore(&head->lock, flags); 425 } 426 427 /** 428 * sctp_list_dequeue - remove from the head of the queue 429 * @list: list to dequeue from 430 * 431 * Remove the head of the list. The head item is 432 * returned or %NULL if the list is empty. 433 */ 434 435 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 436 { 437 struct list_head *result = NULL; 438 439 if (list->next != list) { 440 result = list->next; 441 list->next = result->next; 442 list->next->prev = list; 443 INIT_LIST_HEAD(result); 444 } 445 return result; 446 } 447 448 /* SCTP version of skb_set_owner_r. We need this one because 449 * of the way we have to do receive buffer accounting on bundled 450 * chunks. 451 */ 452 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 453 { 454 struct sctp_ulpevent *event = sctp_skb2event(skb); 455 456 skb->sk = sk; 457 skb->destructor = sctp_sock_rfree; 458 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 459 /* 460 * This mimics the behavior of skb_set_owner_r 461 */ 462 sk->sk_forward_alloc -= event->rmem_len; 463 } 464 465 /* Tests if the list has one and only one entry. */ 466 static inline int sctp_list_single_entry(struct list_head *head) 467 { 468 return ((head->next != head) && (head->next == head->prev)); 469 } 470 471 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 472 static inline __s32 sctp_jitter(__u32 rto) 473 { 474 static __u32 sctp_rand; 475 __s32 ret; 476 477 /* Avoid divide by zero. */ 478 if (!rto) 479 rto = 1; 480 481 sctp_rand += jiffies; 482 sctp_rand ^= (sctp_rand << 12); 483 sctp_rand ^= (sctp_rand >> 20); 484 485 /* Choose random number from 0 to rto, then move to -50% ~ +50% 486 * of rto. 487 */ 488 ret = sctp_rand % rto - (rto >> 1); 489 return ret; 490 } 491 492 /* Break down data chunks at this point. */ 493 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 494 { 495 int frag = pmtu; 496 497 frag -= sp->pf->af->net_header_len; 498 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 499 500 if (sp->user_frag) 501 frag = min_t(int, frag, sp->user_frag); 502 503 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 504 505 return frag; 506 } 507 508 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc) 509 { 510 511 sctp_assoc_sync_pmtu(asoc); 512 asoc->pmtu_pending = 0; 513 } 514 515 /* Walk through a list of TLV parameters. Don't trust the 516 * individual parameter lengths and instead depend on 517 * the chunk length to indicate when to stop. Make sure 518 * there is room for a param header too. 519 */ 520 #define sctp_walk_params(pos, chunk, member)\ 521 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 522 523 #define _sctp_walk_params(pos, chunk, end, member)\ 524 for (pos.v = chunk->member;\ 525 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 526 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 527 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 528 pos.v += WORD_ROUND(ntohs(pos.p->length))) 529 530 #define sctp_walk_errors(err, chunk_hdr)\ 531 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 532 533 #define _sctp_walk_errors(err, chunk_hdr, end)\ 534 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 535 sizeof(sctp_chunkhdr_t));\ 536 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 537 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 538 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 539 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 540 541 #define sctp_walk_fwdtsn(pos, chunk)\ 542 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 543 544 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 545 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 546 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 547 pos++) 548 549 /* Round an int up to the next multiple of 4. */ 550 #define WORD_ROUND(s) (((s)+3)&~3) 551 552 /* Make a new instance of type. */ 553 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 554 555 /* Compare two timevals. */ 556 #define tv_lt(s, t) \ 557 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 558 559 /* Add tv1 to tv2. */ 560 #define TIMEVAL_ADD(tv1, tv2) \ 561 ({ \ 562 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 563 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 564 \ 565 if (usecs >= 1000000) { \ 566 usecs -= 1000000; \ 567 secs++; \ 568 } \ 569 (tv2).tv_sec = secs; \ 570 (tv2).tv_usec = usecs; \ 571 }) 572 573 /* External references. */ 574 575 extern struct proto sctp_prot; 576 extern struct proto sctpv6_prot; 577 extern struct proc_dir_entry *proc_net_sctp; 578 void sctp_put_port(struct sock *sk); 579 580 extern struct idr sctp_assocs_id; 581 extern spinlock_t sctp_assocs_id_lock; 582 583 /* Static inline functions. */ 584 585 /* Convert from an IP version number to an Address Family symbol. */ 586 static inline int ipver2af(__u8 ipver) 587 { 588 switch (ipver) { 589 case 4: 590 return AF_INET; 591 case 6: 592 return AF_INET6; 593 default: 594 return 0; 595 }; 596 } 597 598 /* Convert from an address parameter type to an address family. */ 599 static inline int param_type2af(__be16 type) 600 { 601 switch (type) { 602 case SCTP_PARAM_IPV4_ADDRESS: 603 return AF_INET; 604 case SCTP_PARAM_IPV6_ADDRESS: 605 return AF_INET6; 606 default: 607 return 0; 608 }; 609 } 610 611 /* Perform some sanity checks. */ 612 static inline int sctp_sanity_check(void) 613 { 614 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 615 sizeof(((struct sk_buff *)0)->cb), 616 "SCTP: ulpevent does not fit in skb!\n", return 0); 617 618 return 1; 619 } 620 621 /* Warning: The following hash functions assume a power of two 'size'. */ 622 /* This is the hash function for the SCTP port hash table. */ 623 static inline int sctp_phashfn(__u16 lport) 624 { 625 return (lport & (sctp_port_hashsize - 1)); 626 } 627 628 /* This is the hash function for the endpoint hash table. */ 629 static inline int sctp_ep_hashfn(__u16 lport) 630 { 631 return (lport & (sctp_ep_hashsize - 1)); 632 } 633 634 /* This is the hash function for the association hash table. */ 635 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 636 { 637 int h = (lport << 16) + rport; 638 h ^= h>>8; 639 return (h & (sctp_assoc_hashsize - 1)); 640 } 641 642 /* This is the hash function for the association hash table. This is 643 * not used yet, but could be used as a better hash function when 644 * we have a vtag. 645 */ 646 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 647 { 648 int h = (lport << 16) + rport; 649 h ^= vtag; 650 return (h & (sctp_assoc_hashsize-1)); 651 } 652 653 #define sctp_for_each_hentry(epb, node, head) \ 654 hlist_for_each_entry(epb, node, head, node) 655 656 /* Is a socket of this style? */ 657 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 658 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 659 { 660 return sctp_sk(sk)->type == style; 661 } 662 663 /* Is the association in this state? */ 664 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 665 static inline int __sctp_state(const struct sctp_association *asoc, 666 sctp_state_t state) 667 { 668 return asoc->state == state; 669 } 670 671 /* Is the socket in this state? */ 672 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 673 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 674 { 675 return sk->sk_state == state; 676 } 677 678 /* Map v4-mapped v6 address back to v4 address */ 679 static inline void sctp_v6_map_v4(union sctp_addr *addr) 680 { 681 addr->v4.sin_family = AF_INET; 682 addr->v4.sin_port = addr->v6.sin6_port; 683 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 684 } 685 686 /* Map v4 address to v4-mapped v6 address */ 687 static inline void sctp_v4_map_v6(union sctp_addr *addr) 688 { 689 addr->v6.sin6_family = AF_INET6; 690 addr->v6.sin6_port = addr->v4.sin_port; 691 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 692 addr->v6.sin6_addr.s6_addr32[0] = 0; 693 addr->v6.sin6_addr.s6_addr32[1] = 0; 694 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 695 } 696 697 #endif /* __net_sctp_h__ */ 698