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 IS_ENABLED(CONFIG_IPV6) 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 int sctp_copy_local_addr_list(struct sctp_bind_addr *, 119 sctp_scope_t, gfp_t gfp, 120 int flags); 121 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 122 extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 123 extern void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *, int); 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 extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 139 140 /* 141 * sctp/primitive.c 142 */ 143 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); 144 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); 145 int sctp_primitive_ABORT(struct sctp_association *, void *arg); 146 int sctp_primitive_SEND(struct sctp_association *, void *arg); 147 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); 148 int sctp_primitive_ASCONF(struct sctp_association *, void *arg); 149 150 /* 151 * sctp/input.c 152 */ 153 int sctp_rcv(struct sk_buff *skb); 154 void sctp_v4_err(struct sk_buff *skb, u32 info); 155 void sctp_hash_established(struct sctp_association *); 156 void sctp_unhash_established(struct sctp_association *); 157 void sctp_hash_endpoint(struct sctp_endpoint *); 158 void sctp_unhash_endpoint(struct sctp_endpoint *); 159 struct sock *sctp_err_lookup(int family, struct sk_buff *, 160 struct sctphdr *, struct sctp_association **, 161 struct sctp_transport **); 162 void sctp_err_finish(struct sock *, struct sctp_association *); 163 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 164 struct sctp_transport *t, __u32 pmtu); 165 void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 166 struct sk_buff *); 167 void sctp_icmp_proto_unreachable(struct sock *sk, 168 struct sctp_association *asoc, 169 struct sctp_transport *t); 170 void sctp_backlog_migrate(struct sctp_association *assoc, 171 struct sock *oldsk, struct sock *newsk); 172 173 /* 174 * sctp/proc.c 175 */ 176 int sctp_snmp_proc_init(void); 177 void sctp_snmp_proc_exit(void); 178 int sctp_eps_proc_init(void); 179 void sctp_eps_proc_exit(void); 180 int sctp_assocs_proc_init(void); 181 void sctp_assocs_proc_exit(void); 182 int sctp_remaddr_proc_init(void); 183 void sctp_remaddr_proc_exit(void); 184 185 186 /* 187 * Module global variables 188 */ 189 190 /* 191 * sctp/protocol.c 192 */ 193 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 194 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 195 196 /* 197 * Section: Macros, externs, and inlines 198 */ 199 200 201 #ifdef TEST_FRAME 202 #include <test_frame.h> 203 #else 204 205 /* spin lock wrappers. */ 206 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 207 #define sctp_spin_unlock_irqrestore(lock, flags) \ 208 spin_unlock_irqrestore(lock, flags) 209 #define sctp_local_bh_disable() local_bh_disable() 210 #define sctp_local_bh_enable() local_bh_enable() 211 #define sctp_spin_lock(lock) spin_lock(lock) 212 #define sctp_spin_unlock(lock) spin_unlock(lock) 213 #define sctp_write_lock(lock) write_lock(lock) 214 #define sctp_write_unlock(lock) write_unlock(lock) 215 #define sctp_read_lock(lock) read_lock(lock) 216 #define sctp_read_unlock(lock) read_unlock(lock) 217 218 /* sock lock wrappers. */ 219 #define sctp_lock_sock(sk) lock_sock(sk) 220 #define sctp_release_sock(sk) release_sock(sk) 221 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 222 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 223 224 /* SCTP SNMP MIB stats handlers */ 225 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 226 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 227 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 228 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 229 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 230 231 #endif /* !TEST_FRAME */ 232 233 /* sctp mib definitions */ 234 enum { 235 SCTP_MIB_NUM = 0, 236 SCTP_MIB_CURRESTAB, /* CurrEstab */ 237 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 238 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 239 SCTP_MIB_ABORTEDS, /* Aborteds */ 240 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 241 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 242 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 243 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 244 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 245 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 246 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 247 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 248 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 249 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 250 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 251 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 252 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 253 SCTP_MIB_T1_INIT_EXPIREDS, 254 SCTP_MIB_T1_COOKIE_EXPIREDS, 255 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 256 SCTP_MIB_T3_RTX_EXPIREDS, 257 SCTP_MIB_T4_RTO_EXPIREDS, 258 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 259 SCTP_MIB_DELAY_SACK_EXPIREDS, 260 SCTP_MIB_AUTOCLOSE_EXPIREDS, 261 SCTP_MIB_T1_RETRANSMITS, 262 SCTP_MIB_T3_RETRANSMITS, 263 SCTP_MIB_PMTUD_RETRANSMITS, 264 SCTP_MIB_FAST_RETRANSMITS, 265 SCTP_MIB_IN_PKT_SOFTIRQ, 266 SCTP_MIB_IN_PKT_BACKLOG, 267 SCTP_MIB_IN_PKT_DISCARDS, 268 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 269 __SCTP_MIB_MAX 270 }; 271 272 #define SCTP_MIB_MAX __SCTP_MIB_MAX 273 struct sctp_mib { 274 unsigned long mibs[SCTP_MIB_MAX]; 275 }; 276 277 278 /* Print debugging messages. */ 279 #if SCTP_DEBUG 280 extern int sctp_debug_flag; 281 #define SCTP_DEBUG_PRINTK(fmt, args...) \ 282 do { \ 283 if (sctp_debug_flag) \ 284 printk(KERN_DEBUG pr_fmt(fmt), ##args); \ 285 } while (0) 286 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \ 287 do { \ 288 if (sctp_debug_flag) \ 289 pr_cont(fmt, ##args); \ 290 } while (0) 291 #define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \ 292 args_lead, addr, args_trail...) \ 293 do { \ 294 const union sctp_addr *_addr = (addr); \ 295 if (sctp_debug_flag) { \ 296 if (_addr->sa.sa_family == AF_INET6) { \ 297 printk(KERN_DEBUG \ 298 pr_fmt(fmt_lead "%pI6" fmt_trail), \ 299 args_lead, \ 300 &_addr->v6.sin6_addr, \ 301 args_trail); \ 302 } else { \ 303 printk(KERN_DEBUG \ 304 pr_fmt(fmt_lead "%pI4" fmt_trail), \ 305 args_lead, \ 306 &_addr->v4.sin_addr.s_addr, \ 307 args_trail); \ 308 } \ 309 } \ 310 } while (0) 311 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 312 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 313 314 #define SCTP_ASSERT(expr, str, func) \ 315 if (!(expr)) { \ 316 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 317 str, (#expr), __FILE__, __func__, __LINE__); \ 318 func; \ 319 } 320 321 #else /* SCTP_DEBUG */ 322 323 #define SCTP_DEBUG_PRINTK(whatever...) 324 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) 325 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 326 #define SCTP_ENABLE_DEBUG 327 #define SCTP_DISABLE_DEBUG 328 #define SCTP_ASSERT(expr, str, func) 329 330 #endif /* SCTP_DEBUG */ 331 332 333 /* 334 * Macros for keeping a global reference of object allocations. 335 */ 336 #ifdef CONFIG_SCTP_DBG_OBJCNT 337 338 extern atomic_t sctp_dbg_objcnt_sock; 339 extern atomic_t sctp_dbg_objcnt_ep; 340 extern atomic_t sctp_dbg_objcnt_assoc; 341 extern atomic_t sctp_dbg_objcnt_transport; 342 extern atomic_t sctp_dbg_objcnt_chunk; 343 extern atomic_t sctp_dbg_objcnt_bind_addr; 344 extern atomic_t sctp_dbg_objcnt_bind_bucket; 345 extern atomic_t sctp_dbg_objcnt_addr; 346 extern atomic_t sctp_dbg_objcnt_ssnmap; 347 extern atomic_t sctp_dbg_objcnt_datamsg; 348 extern atomic_t sctp_dbg_objcnt_keys; 349 350 /* Macros to atomically increment/decrement objcnt counters. */ 351 #define SCTP_DBG_OBJCNT_INC(name) \ 352 atomic_inc(&sctp_dbg_objcnt_## name) 353 #define SCTP_DBG_OBJCNT_DEC(name) \ 354 atomic_dec(&sctp_dbg_objcnt_## name) 355 #define SCTP_DBG_OBJCNT(name) \ 356 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 357 358 /* Macro to help create new entries in in the global array of 359 * objcnt counters. 360 */ 361 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 362 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 363 364 void sctp_dbg_objcnt_init(void); 365 void sctp_dbg_objcnt_exit(void); 366 367 #else 368 369 #define SCTP_DBG_OBJCNT_INC(name) 370 #define SCTP_DBG_OBJCNT_DEC(name) 371 372 static inline void sctp_dbg_objcnt_init(void) { return; } 373 static inline void sctp_dbg_objcnt_exit(void) { return; } 374 375 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 376 377 #if defined CONFIG_SYSCTL 378 void sctp_sysctl_register(void); 379 void sctp_sysctl_unregister(void); 380 #else 381 static inline void sctp_sysctl_register(void) { return; } 382 static inline void sctp_sysctl_unregister(void) { return; } 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 IS_ENABLED(CONFIG_IPV6) 389 390 void sctp_v6_pf_init(void); 391 void sctp_v6_pf_exit(void); 392 int sctp_v6_protosw_init(void); 393 void sctp_v6_protosw_exit(void); 394 int sctp_v6_add_protocol(void); 395 void sctp_v6_del_protocol(void); 396 397 #else /* #ifdef defined(CONFIG_IPV6) */ 398 399 static inline void sctp_v6_pf_init(void) { return; } 400 static inline void sctp_v6_pf_exit(void) { return; } 401 static inline int sctp_v6_protosw_init(void) { return 0; } 402 static inline void sctp_v6_protosw_exit(void) { return; } 403 static inline int sctp_v6_add_protocol(void) { return 0; } 404 static inline void sctp_v6_del_protocol(void) { return; } 405 406 #endif /* #if defined(CONFIG_IPV6) */ 407 408 409 /* Map an association to an assoc_id. */ 410 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 411 { 412 return asoc ? asoc->assoc_id : 0; 413 } 414 415 /* Look up the association by its id. */ 416 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 417 418 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 419 420 /* A macro to walk a list of skbs. */ 421 #define sctp_skb_for_each(pos, head, tmp) \ 422 skb_queue_walk_safe(head, pos, tmp) 423 424 /* A helper to append an entire skb list (list) to another (head). */ 425 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 426 struct sk_buff_head *head) 427 { 428 unsigned long flags; 429 430 sctp_spin_lock_irqsave(&head->lock, flags); 431 sctp_spin_lock(&list->lock); 432 433 skb_queue_splice_tail_init(list, head); 434 435 sctp_spin_unlock(&list->lock); 436 sctp_spin_unlock_irqrestore(&head->lock, flags); 437 } 438 439 /** 440 * sctp_list_dequeue - remove from the head of the queue 441 * @list: list to dequeue from 442 * 443 * Remove the head of the list. The head item is 444 * returned or %NULL if the list is empty. 445 */ 446 447 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 448 { 449 struct list_head *result = NULL; 450 451 if (list->next != list) { 452 result = list->next; 453 list->next = result->next; 454 list->next->prev = list; 455 INIT_LIST_HEAD(result); 456 } 457 return result; 458 } 459 460 /* SCTP version of skb_set_owner_r. We need this one because 461 * of the way we have to do receive buffer accounting on bundled 462 * chunks. 463 */ 464 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 465 { 466 struct sctp_ulpevent *event = sctp_skb2event(skb); 467 468 skb_orphan(skb); 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 skb_set_owner_r 474 */ 475 sk->sk_forward_alloc -= event->rmem_len; 476 } 477 478 /* Tests if the list has one and only one entry. */ 479 static inline int sctp_list_single_entry(struct list_head *head) 480 { 481 return (head->next != head) && (head->next == head->prev); 482 } 483 484 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 485 static inline __s32 sctp_jitter(__u32 rto) 486 { 487 static __u32 sctp_rand; 488 __s32 ret; 489 490 /* Avoid divide by zero. */ 491 if (!rto) 492 rto = 1; 493 494 sctp_rand += jiffies; 495 sctp_rand ^= (sctp_rand << 12); 496 sctp_rand ^= (sctp_rand >> 20); 497 498 /* Choose random number from 0 to rto, then move to -50% ~ +50% 499 * of rto. 500 */ 501 ret = sctp_rand % rto - (rto >> 1); 502 return ret; 503 } 504 505 /* Break down data chunks at this point. */ 506 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 507 { 508 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 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 (asoc->user_frag) 515 frag = min_t(int, frag, asoc->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 sock *sk, struct sctp_association *asoc) 523 { 524 525 sctp_assoc_sync_pmtu(sk, 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 - ntohs(pos.p->length) &&\ 540 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 541 pos.v += WORD_ROUND(ntohs(pos.p->length))) 542 543 #define sctp_walk_errors(err, chunk_hdr)\ 544 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 545 546 #define _sctp_walk_errors(err, chunk_hdr, end)\ 547 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 548 sizeof(sctp_chunkhdr_t));\ 549 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 550 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 551 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 552 553 #define sctp_walk_fwdtsn(pos, chunk)\ 554 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 555 556 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 557 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 558 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 559 pos++) 560 561 /* Round an int up to the next multiple of 4. */ 562 #define WORD_ROUND(s) (((s)+3)&~3) 563 564 /* Make a new instance of type. */ 565 #define t_new(type, flags) (type *)kzalloc(sizeof(type), flags) 566 567 /* Compare two timevals. */ 568 #define tv_lt(s, t) \ 569 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 570 571 /* Add tv1 to tv2. */ 572 #define TIMEVAL_ADD(tv1, tv2) \ 573 ({ \ 574 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 575 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 576 \ 577 if (usecs >= 1000000) { \ 578 usecs -= 1000000; \ 579 secs++; \ 580 } \ 581 (tv2).tv_sec = secs; \ 582 (tv2).tv_usec = usecs; \ 583 }) 584 585 /* External references. */ 586 587 extern struct proto sctp_prot; 588 extern struct proto sctpv6_prot; 589 extern struct proc_dir_entry *proc_net_sctp; 590 void sctp_put_port(struct sock *sk); 591 592 extern struct idr sctp_assocs_id; 593 extern spinlock_t sctp_assocs_id_lock; 594 595 /* Static inline functions. */ 596 597 /* Convert from an IP version number to an Address Family symbol. */ 598 static inline int ipver2af(__u8 ipver) 599 { 600 switch (ipver) { 601 case 4: 602 return AF_INET; 603 case 6: 604 return AF_INET6; 605 default: 606 return 0; 607 } 608 } 609 610 /* Convert from an address parameter type to an address family. */ 611 static inline int param_type2af(__be16 type) 612 { 613 switch (type) { 614 case SCTP_PARAM_IPV4_ADDRESS: 615 return AF_INET; 616 case SCTP_PARAM_IPV6_ADDRESS: 617 return AF_INET6; 618 default: 619 return 0; 620 } 621 } 622 623 /* Perform some sanity checks. */ 624 static inline int sctp_sanity_check(void) 625 { 626 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 627 sizeof(((struct sk_buff *)0)->cb), 628 "SCTP: ulpevent does not fit in skb!\n", return 0); 629 630 return 1; 631 } 632 633 /* Warning: The following hash functions assume a power of two 'size'. */ 634 /* This is the hash function for the SCTP port hash table. */ 635 static inline int sctp_phashfn(__u16 lport) 636 { 637 return lport & (sctp_port_hashsize - 1); 638 } 639 640 /* This is the hash function for the endpoint hash table. */ 641 static inline int sctp_ep_hashfn(__u16 lport) 642 { 643 return lport & (sctp_ep_hashsize - 1); 644 } 645 646 /* This is the hash function for the association hash table. */ 647 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 648 { 649 int h = (lport << 16) + rport; 650 h ^= h>>8; 651 return h & (sctp_assoc_hashsize - 1); 652 } 653 654 /* This is the hash function for the association hash table. This is 655 * not used yet, but could be used as a better hash function when 656 * we have a vtag. 657 */ 658 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 659 { 660 int h = (lport << 16) + rport; 661 h ^= vtag; 662 return h & (sctp_assoc_hashsize - 1); 663 } 664 665 #define sctp_for_each_hentry(epb, node, head) \ 666 hlist_for_each_entry(epb, node, head, node) 667 668 /* Is a socket of this style? */ 669 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 670 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 671 { 672 return sctp_sk(sk)->type == style; 673 } 674 675 /* Is the association in this state? */ 676 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 677 static inline int __sctp_state(const struct sctp_association *asoc, 678 sctp_state_t state) 679 { 680 return asoc->state == state; 681 } 682 683 /* Is the socket in this state? */ 684 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 685 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 686 { 687 return sk->sk_state == state; 688 } 689 690 /* Map v4-mapped v6 address back to v4 address */ 691 static inline void sctp_v6_map_v4(union sctp_addr *addr) 692 { 693 addr->v4.sin_family = AF_INET; 694 addr->v4.sin_port = addr->v6.sin6_port; 695 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 696 } 697 698 /* Map v4 address to v4-mapped v6 address */ 699 static inline void sctp_v4_map_v6(union sctp_addr *addr) 700 { 701 addr->v6.sin6_family = AF_INET6; 702 addr->v6.sin6_port = addr->v4.sin_port; 703 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 704 addr->v6.sin6_addr.s6_addr32[0] = 0; 705 addr->v6.sin6_addr.s6_addr32[1] = 0; 706 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 707 } 708 709 /* The cookie is always 0 since this is how it's used in the 710 * pmtu code. 711 */ 712 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 713 { 714 if (t->dst && !dst_check(t->dst, 0)) { 715 dst_release(t->dst); 716 t->dst = NULL; 717 } 718 719 return t->dst; 720 } 721 722 #endif /* __net_sctp_h__ */ 723