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 void sctp_data_ready(struct sock *sk, int len); 132 unsigned int sctp_poll(struct file *file, struct socket *sock, 133 poll_table *wait); 134 void sctp_sock_rfree(struct sk_buff *skb); 135 void sctp_copy_sock(struct sock *newsk, struct sock *sk, 136 struct sctp_association *asoc); 137 extern struct percpu_counter sctp_sockets_allocated; 138 139 /* 140 * sctp/primitive.c 141 */ 142 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); 143 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); 144 int sctp_primitive_ABORT(struct sctp_association *, void *arg); 145 int sctp_primitive_SEND(struct sctp_association *, void *arg); 146 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); 147 int sctp_primitive_ASCONF(struct sctp_association *, void *arg); 148 149 /* 150 * sctp/input.c 151 */ 152 int sctp_rcv(struct sk_buff *skb); 153 void sctp_v4_err(struct sk_buff *skb, u32 info); 154 void sctp_hash_established(struct sctp_association *); 155 void sctp_unhash_established(struct sctp_association *); 156 void sctp_hash_endpoint(struct sctp_endpoint *); 157 void sctp_unhash_endpoint(struct sctp_endpoint *); 158 struct sock *sctp_err_lookup(int family, struct sk_buff *, 159 struct sctphdr *, struct sctp_association **, 160 struct sctp_transport **); 161 void sctp_err_finish(struct sock *, struct sctp_association *); 162 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 163 struct sctp_transport *t, __u32 pmtu); 164 void sctp_icmp_proto_unreachable(struct sock *sk, 165 struct sctp_association *asoc, 166 struct sctp_transport *t); 167 void sctp_backlog_migrate(struct sctp_association *assoc, 168 struct sock *oldsk, struct sock *newsk); 169 170 /* 171 * sctp/proc.c 172 */ 173 int sctp_snmp_proc_init(void); 174 void sctp_snmp_proc_exit(void); 175 int sctp_eps_proc_init(void); 176 void sctp_eps_proc_exit(void); 177 int sctp_assocs_proc_init(void); 178 void sctp_assocs_proc_exit(void); 179 int sctp_remaddr_proc_init(void); 180 void sctp_remaddr_proc_exit(void); 181 182 183 /* 184 * Module global variables 185 */ 186 187 /* 188 * sctp/protocol.c 189 */ 190 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 191 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 192 193 /* 194 * Section: Macros, externs, and inlines 195 */ 196 197 198 #ifdef TEST_FRAME 199 #include <test_frame.h> 200 #else 201 202 /* spin lock wrappers. */ 203 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 204 #define sctp_spin_unlock_irqrestore(lock, flags) \ 205 spin_unlock_irqrestore(lock, flags) 206 #define sctp_local_bh_disable() local_bh_disable() 207 #define sctp_local_bh_enable() local_bh_enable() 208 #define sctp_spin_lock(lock) spin_lock(lock) 209 #define sctp_spin_unlock(lock) spin_unlock(lock) 210 #define sctp_write_lock(lock) write_lock(lock) 211 #define sctp_write_unlock(lock) write_unlock(lock) 212 #define sctp_read_lock(lock) read_lock(lock) 213 #define sctp_read_unlock(lock) read_unlock(lock) 214 215 /* sock lock wrappers. */ 216 #define sctp_lock_sock(sk) lock_sock(sk) 217 #define sctp_release_sock(sk) release_sock(sk) 218 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 219 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 220 221 /* SCTP SNMP MIB stats handlers */ 222 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 223 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 224 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 225 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 226 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 227 228 #endif /* !TEST_FRAME */ 229 230 /* sctp mib definitions */ 231 enum { 232 SCTP_MIB_NUM = 0, 233 SCTP_MIB_CURRESTAB, /* CurrEstab */ 234 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 235 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 236 SCTP_MIB_ABORTEDS, /* Aborteds */ 237 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 238 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 239 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 240 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 241 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 242 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 243 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 244 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 245 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 246 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 247 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 248 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 249 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 250 SCTP_MIB_T1_INIT_EXPIREDS, 251 SCTP_MIB_T1_COOKIE_EXPIREDS, 252 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 253 SCTP_MIB_T3_RTX_EXPIREDS, 254 SCTP_MIB_T4_RTO_EXPIREDS, 255 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 256 SCTP_MIB_DELAY_SACK_EXPIREDS, 257 SCTP_MIB_AUTOCLOSE_EXPIREDS, 258 SCTP_MIB_T1_RETRANSMITS, 259 SCTP_MIB_T3_RETRANSMITS, 260 SCTP_MIB_PMTUD_RETRANSMITS, 261 SCTP_MIB_FAST_RETRANSMITS, 262 SCTP_MIB_IN_PKT_SOFTIRQ, 263 SCTP_MIB_IN_PKT_BACKLOG, 264 SCTP_MIB_IN_PKT_DISCARDS, 265 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 266 __SCTP_MIB_MAX 267 }; 268 269 #define SCTP_MIB_MAX __SCTP_MIB_MAX 270 struct sctp_mib { 271 unsigned long mibs[SCTP_MIB_MAX]; 272 }; 273 274 275 /* Print debugging messages. */ 276 #if SCTP_DEBUG 277 extern int sctp_debug_flag; 278 #define SCTP_DEBUG_PRINTK(whatever...) \ 279 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 280 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ 281 if (sctp_debug_flag) { \ 282 if (saddr->sa.sa_family == AF_INET6) { \ 283 printk(KERN_DEBUG \ 284 lead "%pI6" trail, \ 285 leadparm, \ 286 &saddr->v6.sin6_addr, \ 287 otherparms); \ 288 } else { \ 289 printk(KERN_DEBUG \ 290 lead "%pI4" trail, \ 291 leadparm, \ 292 &saddr->v4.sin_addr.s_addr, \ 293 otherparms); \ 294 } \ 295 } 296 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 297 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 298 299 #define SCTP_ASSERT(expr, str, func) \ 300 if (!(expr)) { \ 301 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 302 str, (#expr), __FILE__, __func__, __LINE__); \ 303 func; \ 304 } 305 306 #else /* SCTP_DEBUG */ 307 308 #define SCTP_DEBUG_PRINTK(whatever...) 309 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 310 #define SCTP_ENABLE_DEBUG 311 #define SCTP_DISABLE_DEBUG 312 #define SCTP_ASSERT(expr, str, func) 313 314 #endif /* SCTP_DEBUG */ 315 316 317 /* 318 * Macros for keeping a global reference of object allocations. 319 */ 320 #ifdef CONFIG_SCTP_DBG_OBJCNT 321 322 extern atomic_t sctp_dbg_objcnt_sock; 323 extern atomic_t sctp_dbg_objcnt_ep; 324 extern atomic_t sctp_dbg_objcnt_assoc; 325 extern atomic_t sctp_dbg_objcnt_transport; 326 extern atomic_t sctp_dbg_objcnt_chunk; 327 extern atomic_t sctp_dbg_objcnt_bind_addr; 328 extern atomic_t sctp_dbg_objcnt_bind_bucket; 329 extern atomic_t sctp_dbg_objcnt_addr; 330 extern atomic_t sctp_dbg_objcnt_ssnmap; 331 extern atomic_t sctp_dbg_objcnt_datamsg; 332 extern atomic_t sctp_dbg_objcnt_keys; 333 334 /* Macros to atomically increment/decrement objcnt counters. */ 335 #define SCTP_DBG_OBJCNT_INC(name) \ 336 atomic_inc(&sctp_dbg_objcnt_## name) 337 #define SCTP_DBG_OBJCNT_DEC(name) \ 338 atomic_dec(&sctp_dbg_objcnt_## name) 339 #define SCTP_DBG_OBJCNT(name) \ 340 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 341 342 /* Macro to help create new entries in in the global array of 343 * objcnt counters. 344 */ 345 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 346 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 347 348 void sctp_dbg_objcnt_init(void); 349 void sctp_dbg_objcnt_exit(void); 350 351 #else 352 353 #define SCTP_DBG_OBJCNT_INC(name) 354 #define SCTP_DBG_OBJCNT_DEC(name) 355 356 static inline void sctp_dbg_objcnt_init(void) { return; } 357 static inline void sctp_dbg_objcnt_exit(void) { return; } 358 359 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 360 361 #if defined CONFIG_SYSCTL 362 void sctp_sysctl_register(void); 363 void sctp_sysctl_unregister(void); 364 #else 365 static inline void sctp_sysctl_register(void) { return; } 366 static inline void sctp_sysctl_unregister(void) { return; } 367 #endif 368 369 /* Size of Supported Address Parameter for 'x' address types. */ 370 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 371 372 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 373 374 void sctp_v6_pf_init(void); 375 void sctp_v6_pf_exit(void); 376 int sctp_v6_protosw_init(void); 377 void sctp_v6_protosw_exit(void); 378 int sctp_v6_add_protocol(void); 379 void sctp_v6_del_protocol(void); 380 381 #else /* #ifdef defined(CONFIG_IPV6) */ 382 383 static inline void sctp_v6_pf_init(void) { return; } 384 static inline void sctp_v6_pf_exit(void) { return; } 385 static inline int sctp_v6_protosw_init(void) { return 0; } 386 static inline void sctp_v6_protosw_exit(void) { return; } 387 static inline int sctp_v6_add_protocol(void) { return 0; } 388 static inline void sctp_v6_del_protocol(void) { return; } 389 390 #endif /* #if defined(CONFIG_IPV6) */ 391 392 393 /* Map an association to an assoc_id. */ 394 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 395 { 396 return (asoc?asoc->assoc_id:0); 397 } 398 399 /* Look up the association by its id. */ 400 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 401 402 403 /* A macro to walk a list of skbs. */ 404 #define sctp_skb_for_each(pos, head, tmp) \ 405 skb_queue_walk_safe(head, pos, tmp) 406 407 /* A helper to append an entire skb list (list) to another (head). */ 408 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 409 struct sk_buff_head *head) 410 { 411 unsigned long flags; 412 413 sctp_spin_lock_irqsave(&head->lock, flags); 414 sctp_spin_lock(&list->lock); 415 416 skb_queue_splice_tail_init(list, head); 417 418 sctp_spin_unlock(&list->lock); 419 sctp_spin_unlock_irqrestore(&head->lock, flags); 420 } 421 422 /** 423 * sctp_list_dequeue - remove from the head of the queue 424 * @list: list to dequeue from 425 * 426 * Remove the head of the list. The head item is 427 * returned or %NULL if the list is empty. 428 */ 429 430 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 431 { 432 struct list_head *result = NULL; 433 434 if (list->next != list) { 435 result = list->next; 436 list->next = result->next; 437 list->next->prev = list; 438 INIT_LIST_HEAD(result); 439 } 440 return result; 441 } 442 443 /* SCTP version of skb_set_owner_r. We need this one because 444 * of the way we have to do receive buffer accounting on bundled 445 * chunks. 446 */ 447 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 448 { 449 struct sctp_ulpevent *event = sctp_skb2event(skb); 450 451 skb_orphan(skb); 452 skb->sk = sk; 453 skb->destructor = sctp_sock_rfree; 454 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 455 /* 456 * This mimics the behavior of skb_set_owner_r 457 */ 458 sk->sk_forward_alloc -= event->rmem_len; 459 } 460 461 /* Tests if the list has one and only one entry. */ 462 static inline int sctp_list_single_entry(struct list_head *head) 463 { 464 return ((head->next != head) && (head->next == head->prev)); 465 } 466 467 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 468 static inline __s32 sctp_jitter(__u32 rto) 469 { 470 static __u32 sctp_rand; 471 __s32 ret; 472 473 /* Avoid divide by zero. */ 474 if (!rto) 475 rto = 1; 476 477 sctp_rand += jiffies; 478 sctp_rand ^= (sctp_rand << 12); 479 sctp_rand ^= (sctp_rand >> 20); 480 481 /* Choose random number from 0 to rto, then move to -50% ~ +50% 482 * of rto. 483 */ 484 ret = sctp_rand % rto - (rto >> 1); 485 return ret; 486 } 487 488 /* Break down data chunks at this point. */ 489 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 490 { 491 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 492 int frag = pmtu; 493 494 frag -= sp->pf->af->net_header_len; 495 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 496 497 if (asoc->user_frag) 498 frag = min_t(int, frag, asoc->user_frag); 499 500 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 501 502 return frag; 503 } 504 505 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc) 506 { 507 508 sctp_assoc_sync_pmtu(asoc); 509 asoc->pmtu_pending = 0; 510 } 511 512 /* Walk through a list of TLV parameters. Don't trust the 513 * individual parameter lengths and instead depend on 514 * the chunk length to indicate when to stop. Make sure 515 * there is room for a param header too. 516 */ 517 #define sctp_walk_params(pos, chunk, member)\ 518 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 519 520 #define _sctp_walk_params(pos, chunk, end, member)\ 521 for (pos.v = chunk->member;\ 522 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 523 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 524 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 525 pos.v += WORD_ROUND(ntohs(pos.p->length))) 526 527 #define sctp_walk_errors(err, chunk_hdr)\ 528 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 529 530 #define _sctp_walk_errors(err, chunk_hdr, end)\ 531 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 532 sizeof(sctp_chunkhdr_t));\ 533 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 534 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 535 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 536 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 537 538 #define sctp_walk_fwdtsn(pos, chunk)\ 539 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 540 541 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 542 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 543 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 544 pos++) 545 546 /* Round an int up to the next multiple of 4. */ 547 #define WORD_ROUND(s) (((s)+3)&~3) 548 549 /* Make a new instance of type. */ 550 #define t_new(type, flags) (type *)kzalloc(sizeof(type), flags) 551 552 /* Compare two timevals. */ 553 #define tv_lt(s, t) \ 554 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 555 556 /* Add tv1 to tv2. */ 557 #define TIMEVAL_ADD(tv1, tv2) \ 558 ({ \ 559 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 560 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 561 \ 562 if (usecs >= 1000000) { \ 563 usecs -= 1000000; \ 564 secs++; \ 565 } \ 566 (tv2).tv_sec = secs; \ 567 (tv2).tv_usec = usecs; \ 568 }) 569 570 /* External references. */ 571 572 extern struct proto sctp_prot; 573 extern struct proto sctpv6_prot; 574 extern struct proc_dir_entry *proc_net_sctp; 575 void sctp_put_port(struct sock *sk); 576 577 extern struct idr sctp_assocs_id; 578 extern spinlock_t sctp_assocs_id_lock; 579 580 /* Static inline functions. */ 581 582 /* Convert from an IP version number to an Address Family symbol. */ 583 static inline int ipver2af(__u8 ipver) 584 { 585 switch (ipver) { 586 case 4: 587 return AF_INET; 588 case 6: 589 return AF_INET6; 590 default: 591 return 0; 592 }; 593 } 594 595 /* Convert from an address parameter type to an address family. */ 596 static inline int param_type2af(__be16 type) 597 { 598 switch (type) { 599 case SCTP_PARAM_IPV4_ADDRESS: 600 return AF_INET; 601 case SCTP_PARAM_IPV6_ADDRESS: 602 return AF_INET6; 603 default: 604 return 0; 605 }; 606 } 607 608 /* Perform some sanity checks. */ 609 static inline int sctp_sanity_check(void) 610 { 611 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 612 sizeof(((struct sk_buff *)0)->cb), 613 "SCTP: ulpevent does not fit in skb!\n", return 0); 614 615 return 1; 616 } 617 618 /* Warning: The following hash functions assume a power of two 'size'. */ 619 /* This is the hash function for the SCTP port hash table. */ 620 static inline int sctp_phashfn(__u16 lport) 621 { 622 return (lport & (sctp_port_hashsize - 1)); 623 } 624 625 /* This is the hash function for the endpoint hash table. */ 626 static inline int sctp_ep_hashfn(__u16 lport) 627 { 628 return (lport & (sctp_ep_hashsize - 1)); 629 } 630 631 /* This is the hash function for the association hash table. */ 632 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 633 { 634 int h = (lport << 16) + rport; 635 h ^= h>>8; 636 return (h & (sctp_assoc_hashsize - 1)); 637 } 638 639 /* This is the hash function for the association hash table. This is 640 * not used yet, but could be used as a better hash function when 641 * we have a vtag. 642 */ 643 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 644 { 645 int h = (lport << 16) + rport; 646 h ^= vtag; 647 return (h & (sctp_assoc_hashsize-1)); 648 } 649 650 #define sctp_for_each_hentry(epb, node, head) \ 651 hlist_for_each_entry(epb, node, head, node) 652 653 /* Is a socket of this style? */ 654 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 655 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 656 { 657 return sctp_sk(sk)->type == style; 658 } 659 660 /* Is the association in this state? */ 661 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 662 static inline int __sctp_state(const struct sctp_association *asoc, 663 sctp_state_t state) 664 { 665 return asoc->state == state; 666 } 667 668 /* Is the socket in this state? */ 669 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 670 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 671 { 672 return sk->sk_state == state; 673 } 674 675 /* Map v4-mapped v6 address back to v4 address */ 676 static inline void sctp_v6_map_v4(union sctp_addr *addr) 677 { 678 addr->v4.sin_family = AF_INET; 679 addr->v4.sin_port = addr->v6.sin6_port; 680 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 681 } 682 683 /* Map v4 address to v4-mapped v6 address */ 684 static inline void sctp_v4_map_v6(union sctp_addr *addr) 685 { 686 addr->v6.sin6_family = AF_INET6; 687 addr->v6.sin6_port = addr->v4.sin_port; 688 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 689 addr->v6.sin6_addr.s6_addr32[0] = 0; 690 addr->v6.sin6_addr.s6_addr32[1] = 0; 691 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 692 } 693 694 #endif /* __net_sctp_h__ */ 695