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 */ 117extern struct sock *sctp_get_ctl_sock(void); 118extern void sctp_local_addr_free(struct rcu_head *head); 119extern int sctp_copy_local_addr_list(struct sctp_bind_addr *, 120 sctp_scope_t, gfp_t gfp, 121 int flags); 122extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 123extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 124 125/* 126 * sctp/socket.c 127 */ 128int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 129int sctp_inet_listen(struct socket *sock, int backlog); 130void sctp_write_space(struct sock *sk); 131void sctp_data_ready(struct sock *sk, int len); 132unsigned int sctp_poll(struct file *file, struct socket *sock, 133 poll_table *wait); 134void sctp_sock_rfree(struct sk_buff *skb); 135void sctp_copy_sock(struct sock *newsk, struct sock *sk, 136 struct sctp_association *asoc); 137extern struct percpu_counter sctp_sockets_allocated; 138 139/* 140 * sctp/primitive.c 141 */ 142int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); 143int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); 144int sctp_primitive_ABORT(struct sctp_association *, void *arg); 145int sctp_primitive_SEND(struct sctp_association *, void *arg); 146int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); 147int sctp_primitive_ASCONF(struct sctp_association *, void *arg); 148 149/* 150 * sctp/input.c 151 */ 152int sctp_rcv(struct sk_buff *skb); 153void sctp_v4_err(struct sk_buff *skb, u32 info); 154void sctp_hash_established(struct sctp_association *); 155void sctp_unhash_established(struct sctp_association *); 156void sctp_hash_endpoint(struct sctp_endpoint *); 157void sctp_unhash_endpoint(struct sctp_endpoint *); 158struct sock *sctp_err_lookup(int family, struct sk_buff *, 159 struct sctphdr *, struct sctp_association **, 160 struct sctp_transport **); 161void sctp_err_finish(struct sock *, struct sctp_association *); 162void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 163 struct sctp_transport *t, __u32 pmtu); 164void sctp_icmp_proto_unreachable(struct sock *sk, 165 struct sctp_association *asoc, 166 struct sctp_transport *t); 167void sctp_backlog_migrate(struct sctp_association *assoc, 168 struct sock *oldsk, struct sock *newsk); 169 170/* 171 * sctp/proc.c 172 */ 173int sctp_snmp_proc_init(void); 174void sctp_snmp_proc_exit(void); 175int sctp_eps_proc_init(void); 176void sctp_eps_proc_exit(void); 177int sctp_assocs_proc_init(void); 178void sctp_assocs_proc_exit(void); 179int sctp_remaddr_proc_init(void); 180void sctp_remaddr_proc_exit(void); 181 182 183/* 184 * Module global variables 185 */ 186 187 /* 188 * sctp/protocol.c 189 */ 190extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 191extern 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 */ 222DECLARE_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 */ 231enum { 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 270struct sctp_mib { 271 unsigned long mibs[SCTP_MIB_MAX]; 272}; 273 274 275/* Print debugging messages. */ 276#if SCTP_DEBUG 277extern 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 322extern atomic_t sctp_dbg_objcnt_sock; 323extern atomic_t sctp_dbg_objcnt_ep; 324extern atomic_t sctp_dbg_objcnt_assoc; 325extern atomic_t sctp_dbg_objcnt_transport; 326extern atomic_t sctp_dbg_objcnt_chunk; 327extern atomic_t sctp_dbg_objcnt_bind_addr; 328extern atomic_t sctp_dbg_objcnt_bind_bucket; 329extern atomic_t sctp_dbg_objcnt_addr; 330extern atomic_t sctp_dbg_objcnt_ssnmap; 331extern atomic_t sctp_dbg_objcnt_datamsg; 332extern atomic_t sctp_dbg_objcnt_keys; 333 334/* Macros to atomically increment/decrement objcnt counters. */ 335#define SCTP_DBG_OBJCNT_INC(name) \ 336atomic_inc(&sctp_dbg_objcnt_## name) 337#define SCTP_DBG_OBJCNT_DEC(name) \ 338atomic_dec(&sctp_dbg_objcnt_## name) 339#define SCTP_DBG_OBJCNT(name) \ 340atomic_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 348void sctp_dbg_objcnt_init(void); 349void sctp_dbg_objcnt_exit(void); 350 351#else 352 353#define SCTP_DBG_OBJCNT_INC(name) 354#define SCTP_DBG_OBJCNT_DEC(name) 355 356static inline void sctp_dbg_objcnt_init(void) { return; } 357static inline void sctp_dbg_objcnt_exit(void) { return; } 358 359#endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 360 361#if defined CONFIG_SYSCTL 362void sctp_sysctl_register(void); 363void sctp_sysctl_unregister(void); 364#else 365static inline void sctp_sysctl_register(void) { return; } 366static 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 374void sctp_v6_pf_init(void); 375void sctp_v6_pf_exit(void); 376int sctp_v6_protosw_init(void); 377void sctp_v6_protosw_exit(void); 378int sctp_v6_add_protocol(void); 379void sctp_v6_del_protocol(void); 380 381#else /* #ifdef defined(CONFIG_IPV6) */ 382 383static inline void sctp_v6_pf_init(void) { return; } 384static inline void sctp_v6_pf_exit(void) { return; } 385static inline int sctp_v6_protosw_init(void) { return 0; } 386static inline void sctp_v6_protosw_exit(void) { return; } 387static inline int sctp_v6_add_protocol(void) { return 0; } 388static 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. */ 394static 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. */ 400struct 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). */ 408static 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 430static 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 */ 447static 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. */ 462static 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. */ 468static 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. */ 489static 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 505static 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)\ 521for (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)\ 531for (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)\ 542for (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 572extern struct proto sctp_prot; 573extern struct proto sctpv6_prot; 574extern struct proc_dir_entry *proc_net_sctp; 575void sctp_put_port(struct sock *sk); 576 577extern struct idr sctp_assocs_id; 578extern spinlock_t sctp_assocs_id_lock; 579 580/* Static inline functions. */ 581 582/* Convert from an IP version number to an Address Family symbol. */ 583static 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. */ 596static 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. */ 609static 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. */ 620static 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. */ 626static 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. */ 632static 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 */ 643static 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)) 655static 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)) 662static 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)) 670static 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 */ 676static 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 */ 684static 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