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 int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, 118 sctp_scope_t, gfp_t gfp, 119 int flags); 120 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 121 extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 122 extern void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); 123 124 /* 125 * sctp/socket.c 126 */ 127 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 128 int sctp_inet_listen(struct socket *sock, int backlog); 129 void sctp_write_space(struct sock *sk); 130 void sctp_data_ready(struct sock *sk, int len); 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 extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 138 139 /* 140 * sctp/primitive.c 141 */ 142 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 143 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 144 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 145 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 146 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 147 int sctp_primitive_ASCONF(struct net *, 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(struct net *net, 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_redirect(struct sock *, struct sctp_transport *, 165 struct sk_buff *); 166 void sctp_icmp_proto_unreachable(struct sock *sk, 167 struct sctp_association *asoc, 168 struct sctp_transport *t); 169 void sctp_backlog_migrate(struct sctp_association *assoc, 170 struct sock *oldsk, struct sock *newsk); 171 172 /* 173 * sctp/proc.c 174 */ 175 int sctp_snmp_proc_init(struct net *net); 176 void sctp_snmp_proc_exit(struct net *net); 177 int sctp_eps_proc_init(struct net *net); 178 void sctp_eps_proc_exit(struct net *net); 179 int sctp_assocs_proc_init(struct net *net); 180 void sctp_assocs_proc_exit(struct net *net); 181 int sctp_remaddr_proc_init(struct net *net); 182 void sctp_remaddr_proc_exit(struct net *net); 183 184 185 /* 186 * Module global variables 187 */ 188 189 /* 190 * sctp/protocol.c 191 */ 192 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 193 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 194 195 /* 196 * Section: Macros, externs, and inlines 197 */ 198 199 200 #ifdef TEST_FRAME 201 #include <test_frame.h> 202 #else 203 204 /* spin lock wrappers. */ 205 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 206 #define sctp_spin_unlock_irqrestore(lock, flags) \ 207 spin_unlock_irqrestore(lock, flags) 208 #define sctp_local_bh_disable() local_bh_disable() 209 #define sctp_local_bh_enable() local_bh_enable() 210 #define sctp_spin_lock(lock) spin_lock(lock) 211 #define sctp_spin_unlock(lock) spin_unlock(lock) 212 #define sctp_write_lock(lock) write_lock(lock) 213 #define sctp_write_unlock(lock) write_unlock(lock) 214 #define sctp_read_lock(lock) read_lock(lock) 215 #define sctp_read_unlock(lock) read_unlock(lock) 216 217 /* sock lock wrappers. */ 218 #define sctp_lock_sock(sk) lock_sock(sk) 219 #define sctp_release_sock(sk) release_sock(sk) 220 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 221 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 222 223 /* SCTP SNMP MIB stats handlers */ 224 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 225 #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) 226 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) 227 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 228 229 #endif /* !TEST_FRAME */ 230 231 /* sctp mib definitions */ 232 enum { 233 SCTP_MIB_NUM = 0, 234 SCTP_MIB_CURRESTAB, /* CurrEstab */ 235 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 236 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 237 SCTP_MIB_ABORTEDS, /* Aborteds */ 238 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 239 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 240 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 241 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 242 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 243 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 244 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 245 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 246 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 247 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 248 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 249 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 250 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 251 SCTP_MIB_T1_INIT_EXPIREDS, 252 SCTP_MIB_T1_COOKIE_EXPIREDS, 253 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 254 SCTP_MIB_T3_RTX_EXPIREDS, 255 SCTP_MIB_T4_RTO_EXPIREDS, 256 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 257 SCTP_MIB_DELAY_SACK_EXPIREDS, 258 SCTP_MIB_AUTOCLOSE_EXPIREDS, 259 SCTP_MIB_T1_RETRANSMITS, 260 SCTP_MIB_T3_RETRANSMITS, 261 SCTP_MIB_PMTUD_RETRANSMITS, 262 SCTP_MIB_FAST_RETRANSMITS, 263 SCTP_MIB_IN_PKT_SOFTIRQ, 264 SCTP_MIB_IN_PKT_BACKLOG, 265 SCTP_MIB_IN_PKT_DISCARDS, 266 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 267 __SCTP_MIB_MAX 268 }; 269 270 #define SCTP_MIB_MAX __SCTP_MIB_MAX 271 struct sctp_mib { 272 unsigned long mibs[SCTP_MIB_MAX]; 273 }; 274 275 /* helper function to track stats about max rto and related transport */ 276 static inline void sctp_max_rto(struct sctp_association *asoc, 277 struct sctp_transport *trans) 278 { 279 if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 280 asoc->stats.max_obs_rto = trans->rto; 281 memset(&asoc->stats.obs_rto_ipaddr, 0, 282 sizeof(struct sockaddr_storage)); 283 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 284 trans->af_specific->sockaddr_len); 285 } 286 } 287 288 /* Print debugging messages. */ 289 #if SCTP_DEBUG 290 extern int sctp_debug_flag; 291 #define SCTP_DEBUG_PRINTK(fmt, args...) \ 292 do { \ 293 if (sctp_debug_flag) \ 294 printk(KERN_DEBUG pr_fmt(fmt), ##args); \ 295 } while (0) 296 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \ 297 do { \ 298 if (sctp_debug_flag) \ 299 pr_cont(fmt, ##args); \ 300 } while (0) 301 #define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \ 302 args_lead, addr, args_trail...) \ 303 do { \ 304 const union sctp_addr *_addr = (addr); \ 305 if (sctp_debug_flag) { \ 306 if (_addr->sa.sa_family == AF_INET6) { \ 307 printk(KERN_DEBUG \ 308 pr_fmt(fmt_lead "%pI6" fmt_trail), \ 309 args_lead, \ 310 &_addr->v6.sin6_addr, \ 311 args_trail); \ 312 } else { \ 313 printk(KERN_DEBUG \ 314 pr_fmt(fmt_lead "%pI4" fmt_trail), \ 315 args_lead, \ 316 &_addr->v4.sin_addr.s_addr, \ 317 args_trail); \ 318 } \ 319 } \ 320 } while (0) 321 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 322 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 323 324 #define SCTP_ASSERT(expr, str, func) \ 325 if (!(expr)) { \ 326 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 327 str, (#expr), __FILE__, __func__, __LINE__); \ 328 func; \ 329 } 330 331 #else /* SCTP_DEBUG */ 332 333 #define SCTP_DEBUG_PRINTK(whatever...) 334 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) 335 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) 336 #define SCTP_ENABLE_DEBUG 337 #define SCTP_DISABLE_DEBUG 338 #define SCTP_ASSERT(expr, str, func) 339 340 #endif /* SCTP_DEBUG */ 341 342 343 /* 344 * Macros for keeping a global reference of object allocations. 345 */ 346 #ifdef CONFIG_SCTP_DBG_OBJCNT 347 348 extern atomic_t sctp_dbg_objcnt_sock; 349 extern atomic_t sctp_dbg_objcnt_ep; 350 extern atomic_t sctp_dbg_objcnt_assoc; 351 extern atomic_t sctp_dbg_objcnt_transport; 352 extern atomic_t sctp_dbg_objcnt_chunk; 353 extern atomic_t sctp_dbg_objcnt_bind_addr; 354 extern atomic_t sctp_dbg_objcnt_bind_bucket; 355 extern atomic_t sctp_dbg_objcnt_addr; 356 extern atomic_t sctp_dbg_objcnt_ssnmap; 357 extern atomic_t sctp_dbg_objcnt_datamsg; 358 extern atomic_t sctp_dbg_objcnt_keys; 359 360 /* Macros to atomically increment/decrement objcnt counters. */ 361 #define SCTP_DBG_OBJCNT_INC(name) \ 362 atomic_inc(&sctp_dbg_objcnt_## name) 363 #define SCTP_DBG_OBJCNT_DEC(name) \ 364 atomic_dec(&sctp_dbg_objcnt_## name) 365 #define SCTP_DBG_OBJCNT(name) \ 366 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 367 368 /* Macro to help create new entries in in the global array of 369 * objcnt counters. 370 */ 371 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 372 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 373 374 void sctp_dbg_objcnt_init(struct net *); 375 void sctp_dbg_objcnt_exit(struct net *); 376 377 #else 378 379 #define SCTP_DBG_OBJCNT_INC(name) 380 #define SCTP_DBG_OBJCNT_DEC(name) 381 382 static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 383 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 384 385 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 386 387 #if defined CONFIG_SYSCTL 388 void sctp_sysctl_register(void); 389 void sctp_sysctl_unregister(void); 390 int sctp_sysctl_net_register(struct net *net); 391 void sctp_sysctl_net_unregister(struct net *net); 392 #else 393 static inline void sctp_sysctl_register(void) { return; } 394 static inline void sctp_sysctl_unregister(void) { return; } 395 static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 396 static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 397 #endif 398 399 /* Size of Supported Address Parameter for 'x' address types. */ 400 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 401 402 #if IS_ENABLED(CONFIG_IPV6) 403 404 void sctp_v6_pf_init(void); 405 void sctp_v6_pf_exit(void); 406 int sctp_v6_protosw_init(void); 407 void sctp_v6_protosw_exit(void); 408 int sctp_v6_add_protocol(void); 409 void sctp_v6_del_protocol(void); 410 411 #else /* #ifdef defined(CONFIG_IPV6) */ 412 413 static inline void sctp_v6_pf_init(void) { return; } 414 static inline void sctp_v6_pf_exit(void) { return; } 415 static inline int sctp_v6_protosw_init(void) { return 0; } 416 static inline void sctp_v6_protosw_exit(void) { return; } 417 static inline int sctp_v6_add_protocol(void) { return 0; } 418 static inline void sctp_v6_del_protocol(void) { return; } 419 420 #endif /* #if defined(CONFIG_IPV6) */ 421 422 423 /* Map an association to an assoc_id. */ 424 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 425 { 426 return asoc ? asoc->assoc_id : 0; 427 } 428 429 /* Look up the association by its id. */ 430 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 431 432 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 433 434 /* A macro to walk a list of skbs. */ 435 #define sctp_skb_for_each(pos, head, tmp) \ 436 skb_queue_walk_safe(head, pos, tmp) 437 438 /* A helper to append an entire skb list (list) to another (head). */ 439 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 440 struct sk_buff_head *head) 441 { 442 unsigned long flags; 443 444 sctp_spin_lock_irqsave(&head->lock, flags); 445 sctp_spin_lock(&list->lock); 446 447 skb_queue_splice_tail_init(list, head); 448 449 sctp_spin_unlock(&list->lock); 450 sctp_spin_unlock_irqrestore(&head->lock, flags); 451 } 452 453 /** 454 * sctp_list_dequeue - remove from the head of the queue 455 * @list: list to dequeue from 456 * 457 * Remove the head of the list. The head item is 458 * returned or %NULL if the list is empty. 459 */ 460 461 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 462 { 463 struct list_head *result = NULL; 464 465 if (list->next != list) { 466 result = list->next; 467 list->next = result->next; 468 list->next->prev = list; 469 INIT_LIST_HEAD(result); 470 } 471 return result; 472 } 473 474 /* SCTP version of skb_set_owner_r. We need this one because 475 * of the way we have to do receive buffer accounting on bundled 476 * chunks. 477 */ 478 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 479 { 480 struct sctp_ulpevent *event = sctp_skb2event(skb); 481 482 skb_orphan(skb); 483 skb->sk = sk; 484 skb->destructor = sctp_sock_rfree; 485 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 486 /* 487 * This mimics the behavior of skb_set_owner_r 488 */ 489 sk->sk_forward_alloc -= event->rmem_len; 490 } 491 492 /* Tests if the list has one and only one entry. */ 493 static inline int sctp_list_single_entry(struct list_head *head) 494 { 495 return (head->next != head) && (head->next == head->prev); 496 } 497 498 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 499 static inline __s32 sctp_jitter(__u32 rto) 500 { 501 static __u32 sctp_rand; 502 __s32 ret; 503 504 /* Avoid divide by zero. */ 505 if (!rto) 506 rto = 1; 507 508 sctp_rand += jiffies; 509 sctp_rand ^= (sctp_rand << 12); 510 sctp_rand ^= (sctp_rand >> 20); 511 512 /* Choose random number from 0 to rto, then move to -50% ~ +50% 513 * of rto. 514 */ 515 ret = sctp_rand % rto - (rto >> 1); 516 return ret; 517 } 518 519 /* Break down data chunks at this point. */ 520 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 521 { 522 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 523 int frag = pmtu; 524 525 frag -= sp->pf->af->net_header_len; 526 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 527 528 if (asoc->user_frag) 529 frag = min_t(int, frag, asoc->user_frag); 530 531 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 532 533 return frag; 534 } 535 536 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) 537 { 538 539 sctp_assoc_sync_pmtu(sk, asoc); 540 asoc->pmtu_pending = 0; 541 } 542 543 /* Walk through a list of TLV parameters. Don't trust the 544 * individual parameter lengths and instead depend on 545 * the chunk length to indicate when to stop. Make sure 546 * there is room for a param header too. 547 */ 548 #define sctp_walk_params(pos, chunk, member)\ 549 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 550 551 #define _sctp_walk_params(pos, chunk, end, member)\ 552 for (pos.v = chunk->member;\ 553 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 554 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 555 pos.v += WORD_ROUND(ntohs(pos.p->length))) 556 557 #define sctp_walk_errors(err, chunk_hdr)\ 558 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 559 560 #define _sctp_walk_errors(err, chunk_hdr, end)\ 561 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 562 sizeof(sctp_chunkhdr_t));\ 563 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 564 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 565 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 566 567 #define sctp_walk_fwdtsn(pos, chunk)\ 568 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 569 570 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 571 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 572 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 573 pos++) 574 575 /* Round an int up to the next multiple of 4. */ 576 #define WORD_ROUND(s) (((s)+3)&~3) 577 578 /* Make a new instance of type. */ 579 #define t_new(type, flags) (type *)kzalloc(sizeof(type), flags) 580 581 /* Compare two timevals. */ 582 #define tv_lt(s, t) \ 583 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 584 585 /* Add tv1 to tv2. */ 586 #define TIMEVAL_ADD(tv1, tv2) \ 587 ({ \ 588 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 589 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 590 \ 591 if (usecs >= 1000000) { \ 592 usecs -= 1000000; \ 593 secs++; \ 594 } \ 595 (tv2).tv_sec = secs; \ 596 (tv2).tv_usec = usecs; \ 597 }) 598 599 /* External references. */ 600 601 extern struct proto sctp_prot; 602 extern struct proto sctpv6_prot; 603 void sctp_put_port(struct sock *sk); 604 605 extern struct idr sctp_assocs_id; 606 extern spinlock_t sctp_assocs_id_lock; 607 608 /* Static inline functions. */ 609 610 /* Convert from an IP version number to an Address Family symbol. */ 611 static inline int ipver2af(__u8 ipver) 612 { 613 switch (ipver) { 614 case 4: 615 return AF_INET; 616 case 6: 617 return AF_INET6; 618 default: 619 return 0; 620 } 621 } 622 623 /* Convert from an address parameter type to an address family. */ 624 static inline int param_type2af(__be16 type) 625 { 626 switch (type) { 627 case SCTP_PARAM_IPV4_ADDRESS: 628 return AF_INET; 629 case SCTP_PARAM_IPV6_ADDRESS: 630 return AF_INET6; 631 default: 632 return 0; 633 } 634 } 635 636 /* Perform some sanity checks. */ 637 static inline int sctp_sanity_check(void) 638 { 639 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 640 sizeof(((struct sk_buff *)0)->cb), 641 "SCTP: ulpevent does not fit in skb!\n", return 0); 642 643 return 1; 644 } 645 646 /* Warning: The following hash functions assume a power of two 'size'. */ 647 /* This is the hash function for the SCTP port hash table. */ 648 static inline int sctp_phashfn(struct net *net, __u16 lport) 649 { 650 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 651 } 652 653 /* This is the hash function for the endpoint hash table. */ 654 static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 655 { 656 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 657 } 658 659 /* This is the hash function for the association hash table. */ 660 static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport) 661 { 662 int h = (lport << 16) + rport + net_hash_mix(net); 663 h ^= h>>8; 664 return h & (sctp_assoc_hashsize - 1); 665 } 666 667 /* This is the hash function for the association hash table. This is 668 * not used yet, but could be used as a better hash function when 669 * we have a vtag. 670 */ 671 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 672 { 673 int h = (lport << 16) + rport; 674 h ^= vtag; 675 return h & (sctp_assoc_hashsize - 1); 676 } 677 678 #define sctp_for_each_hentry(epb, node, head) \ 679 hlist_for_each_entry(epb, node, head, node) 680 681 /* Is a socket of this style? */ 682 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 683 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 684 { 685 return sctp_sk(sk)->type == style; 686 } 687 688 /* Is the association in this state? */ 689 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 690 static inline int __sctp_state(const struct sctp_association *asoc, 691 sctp_state_t state) 692 { 693 return asoc->state == state; 694 } 695 696 /* Is the socket in this state? */ 697 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 698 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 699 { 700 return sk->sk_state == state; 701 } 702 703 /* Map v4-mapped v6 address back to v4 address */ 704 static inline void sctp_v6_map_v4(union sctp_addr *addr) 705 { 706 addr->v4.sin_family = AF_INET; 707 addr->v4.sin_port = addr->v6.sin6_port; 708 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 709 } 710 711 /* Map v4 address to v4-mapped v6 address */ 712 static inline void sctp_v4_map_v6(union sctp_addr *addr) 713 { 714 addr->v6.sin6_family = AF_INET6; 715 addr->v6.sin6_port = addr->v4.sin_port; 716 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 717 addr->v6.sin6_addr.s6_addr32[0] = 0; 718 addr->v6.sin6_addr.s6_addr32[1] = 0; 719 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 720 } 721 722 /* The cookie is always 0 since this is how it's used in the 723 * pmtu code. 724 */ 725 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 726 { 727 if (t->dst && !dst_check(t->dst, 0)) { 728 dst_release(t->dst); 729 t->dst = NULL; 730 } 731 732 return t->dst; 733 } 734 735 #endif /* __net_sctp_h__ */ 736