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, see 25 * <http://www.gnu.org/licenses/>. 26 * 27 * Please send any bug reports or fixes you make to the 28 * email address(es): 29 * lksctp developers <linux-sctp@vger.kernel.org> 30 * 31 * Written or modified by: 32 * La Monte H.P. Yarroll <piggy@acm.org> 33 * Xingang Guo <xingang.guo@intel.com> 34 * Jon Grimm <jgrimm@us.ibm.com> 35 * Daisy Chang <daisyc@us.ibm.com> 36 * Sridhar Samudrala <sri@us.ibm.com> 37 * Ardelle Fan <ardelle.fan@intel.com> 38 * Ryan Layer <rmlayer@us.ibm.com> 39 * Kevin Gao <kevin.gao@intel.com> 40 */ 41 42 #ifndef __net_sctp_h__ 43 #define __net_sctp_h__ 44 45 /* Header Strategy. 46 * Start getting some control over the header file depencies: 47 * includes 48 * constants 49 * structs 50 * prototypes 51 * macros, externs, and inlines 52 * 53 * Move test_frame specific items out of the kernel headers 54 * and into the test frame headers. This is not perfect in any sense 55 * and will continue to evolve. 56 */ 57 58 #include <linux/types.h> 59 #include <linux/slab.h> 60 #include <linux/in.h> 61 #include <linux/tty.h> 62 #include <linux/proc_fs.h> 63 #include <linux/spinlock.h> 64 #include <linux/jiffies.h> 65 #include <linux/idr.h> 66 67 #if IS_ENABLED(CONFIG_IPV6) 68 #include <net/ipv6.h> 69 #include <net/ip6_route.h> 70 #endif 71 72 #include <linux/uaccess.h> 73 #include <asm/page.h> 74 #include <net/sock.h> 75 #include <net/snmp.h> 76 #include <net/sctp/structs.h> 77 #include <net/sctp/constants.h> 78 79 #ifdef CONFIG_IP_SCTP_MODULE 80 #define SCTP_PROTOSW_FLAG 0 81 #else /* static! */ 82 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 83 #endif 84 85 /* Round an int up to the next multiple of 4. */ 86 #define SCTP_PAD4(s) (((s)+3)&~3) 87 /* Truncate to the previous multiple of 4. */ 88 #define SCTP_TRUNC4(s) ((s)&~3) 89 90 /* 91 * Function declarations. 92 */ 93 94 /* 95 * sctp/protocol.c 96 */ 97 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *addr, 98 enum sctp_scope, gfp_t gfp, int flags); 99 struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 100 int sctp_register_pf(struct sctp_pf *, sa_family_t); 101 void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); 102 103 /* 104 * sctp/socket.c 105 */ 106 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 107 int sctp_inet_listen(struct socket *sock, int backlog); 108 void sctp_write_space(struct sock *sk); 109 void sctp_data_ready(struct sock *sk); 110 __poll_t sctp_poll(struct file *file, struct socket *sock, 111 poll_table *wait); 112 void sctp_sock_rfree(struct sk_buff *skb); 113 void sctp_copy_sock(struct sock *newsk, struct sock *sk, 114 struct sctp_association *asoc); 115 extern struct percpu_counter sctp_sockets_allocated; 116 int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 117 struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); 118 119 void sctp_transport_walk_start(struct rhashtable_iter *iter); 120 void sctp_transport_walk_stop(struct rhashtable_iter *iter); 121 struct sctp_transport *sctp_transport_get_next(struct net *net, 122 struct rhashtable_iter *iter); 123 struct sctp_transport *sctp_transport_get_idx(struct net *net, 124 struct rhashtable_iter *iter, int pos); 125 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *), 126 struct net *net, 127 const union sctp_addr *laddr, 128 const union sctp_addr *paddr, void *p); 129 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *), 130 int (*cb_done)(struct sctp_transport *, void *), 131 struct net *net, int *pos, void *p); 132 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p); 133 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc, 134 struct sctp_info *info); 135 136 /* 137 * sctp/primitive.c 138 */ 139 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 140 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 141 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 142 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 143 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 144 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); 145 int sctp_primitive_RECONF(struct net *net, struct sctp_association *asoc, 146 void *arg); 147 148 /* 149 * sctp/input.c 150 */ 151 int sctp_rcv(struct sk_buff *skb); 152 void sctp_v4_err(struct sk_buff *skb, u32 info); 153 void sctp_hash_endpoint(struct sctp_endpoint *); 154 void sctp_unhash_endpoint(struct sctp_endpoint *); 155 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, 156 struct sctphdr *, struct sctp_association **, 157 struct sctp_transport **); 158 void sctp_err_finish(struct sock *, struct sctp_transport *); 159 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 160 struct sctp_transport *t, __u32 pmtu); 161 void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 162 struct sk_buff *); 163 void sctp_icmp_proto_unreachable(struct sock *sk, 164 struct sctp_association *asoc, 165 struct sctp_transport *t); 166 void sctp_backlog_migrate(struct sctp_association *assoc, 167 struct sock *oldsk, struct sock *newsk); 168 int sctp_transport_hashtable_init(void); 169 void sctp_transport_hashtable_destroy(void); 170 int sctp_hash_transport(struct sctp_transport *t); 171 void sctp_unhash_transport(struct sctp_transport *t); 172 struct sctp_transport *sctp_addrs_lookup_transport( 173 struct net *net, 174 const union sctp_addr *laddr, 175 const union sctp_addr *paddr); 176 struct sctp_transport *sctp_epaddr_lookup_transport( 177 const struct sctp_endpoint *ep, 178 const union sctp_addr *paddr); 179 180 /* 181 * sctp/proc.c 182 */ 183 int sctp_snmp_proc_init(struct net *net); 184 void sctp_snmp_proc_exit(struct net *net); 185 int sctp_eps_proc_init(struct net *net); 186 void sctp_eps_proc_exit(struct net *net); 187 int sctp_assocs_proc_init(struct net *net); 188 void sctp_assocs_proc_exit(struct net *net); 189 int sctp_remaddr_proc_init(struct net *net); 190 void sctp_remaddr_proc_exit(struct net *net); 191 192 /* 193 * sctp/offload.c 194 */ 195 int sctp_offload_init(void); 196 197 /* 198 * sctp/stream_sched.c 199 */ 200 void sctp_sched_ops_init(void); 201 202 /* 203 * sctp/stream.c 204 */ 205 int sctp_send_reset_streams(struct sctp_association *asoc, 206 struct sctp_reset_streams *params); 207 int sctp_send_reset_assoc(struct sctp_association *asoc); 208 int sctp_send_add_streams(struct sctp_association *asoc, 209 struct sctp_add_streams *params); 210 211 /* 212 * Module global variables 213 */ 214 215 /* 216 * sctp/protocol.c 217 */ 218 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 219 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 220 extern long sysctl_sctp_mem[3]; 221 extern int sysctl_sctp_rmem[3]; 222 extern int sysctl_sctp_wmem[3]; 223 224 /* 225 * Section: Macros, externs, and inlines 226 */ 227 228 /* SCTP SNMP MIB stats handlers */ 229 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 230 #define __SCTP_INC_STATS(net, field) __SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 231 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 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 /* helper function to track stats about max rto and related transport */ 278 static inline void sctp_max_rto(struct sctp_association *asoc, 279 struct sctp_transport *trans) 280 { 281 if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 282 asoc->stats.max_obs_rto = trans->rto; 283 memset(&asoc->stats.obs_rto_ipaddr, 0, 284 sizeof(struct sockaddr_storage)); 285 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 286 trans->af_specific->sockaddr_len); 287 } 288 } 289 290 /* 291 * Macros for keeping a global reference of object allocations. 292 */ 293 #ifdef CONFIG_SCTP_DBG_OBJCNT 294 295 extern atomic_t sctp_dbg_objcnt_sock; 296 extern atomic_t sctp_dbg_objcnt_ep; 297 extern atomic_t sctp_dbg_objcnt_assoc; 298 extern atomic_t sctp_dbg_objcnt_transport; 299 extern atomic_t sctp_dbg_objcnt_chunk; 300 extern atomic_t sctp_dbg_objcnt_bind_addr; 301 extern atomic_t sctp_dbg_objcnt_bind_bucket; 302 extern atomic_t sctp_dbg_objcnt_addr; 303 extern atomic_t sctp_dbg_objcnt_datamsg; 304 extern atomic_t sctp_dbg_objcnt_keys; 305 306 /* Macros to atomically increment/decrement objcnt counters. */ 307 #define SCTP_DBG_OBJCNT_INC(name) \ 308 atomic_inc(&sctp_dbg_objcnt_## name) 309 #define SCTP_DBG_OBJCNT_DEC(name) \ 310 atomic_dec(&sctp_dbg_objcnt_## name) 311 #define SCTP_DBG_OBJCNT(name) \ 312 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 313 314 /* Macro to help create new entries in in the global array of 315 * objcnt counters. 316 */ 317 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 318 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 319 320 void sctp_dbg_objcnt_init(struct net *); 321 void sctp_dbg_objcnt_exit(struct net *); 322 323 #else 324 325 #define SCTP_DBG_OBJCNT_INC(name) 326 #define SCTP_DBG_OBJCNT_DEC(name) 327 328 static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 329 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 330 331 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 332 333 #if defined CONFIG_SYSCTL 334 void sctp_sysctl_register(void); 335 void sctp_sysctl_unregister(void); 336 int sctp_sysctl_net_register(struct net *net); 337 void sctp_sysctl_net_unregister(struct net *net); 338 #else 339 static inline void sctp_sysctl_register(void) { return; } 340 static inline void sctp_sysctl_unregister(void) { return; } 341 static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 342 static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 343 #endif 344 345 /* Size of Supported Address Parameter for 'x' address types. */ 346 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 347 348 #if IS_ENABLED(CONFIG_IPV6) 349 350 void sctp_v6_pf_init(void); 351 void sctp_v6_pf_exit(void); 352 int sctp_v6_protosw_init(void); 353 void sctp_v6_protosw_exit(void); 354 int sctp_v6_add_protocol(void); 355 void sctp_v6_del_protocol(void); 356 357 #else /* #ifdef defined(CONFIG_IPV6) */ 358 359 static inline void sctp_v6_pf_init(void) { return; } 360 static inline void sctp_v6_pf_exit(void) { return; } 361 static inline int sctp_v6_protosw_init(void) { return 0; } 362 static inline void sctp_v6_protosw_exit(void) { return; } 363 static inline int sctp_v6_add_protocol(void) { return 0; } 364 static inline void sctp_v6_del_protocol(void) { return; } 365 366 #endif /* #if defined(CONFIG_IPV6) */ 367 368 369 /* Map an association to an assoc_id. */ 370 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 371 { 372 return asoc ? asoc->assoc_id : 0; 373 } 374 375 static inline enum sctp_sstat_state 376 sctp_assoc_to_state(const struct sctp_association *asoc) 377 { 378 /* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we 379 * got rid of it in kernel space. Therefore SCTP_CLOSED et al 380 * start at =1 in user space, but actually as =0 in kernel space. 381 * Now that we can not break user space and SCTP_EMPTY is exposed 382 * there, we need to fix it up with an ugly offset not to break 383 * applications. :( 384 */ 385 return asoc->state + 1; 386 } 387 388 /* Look up the association by its id. */ 389 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 390 391 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 392 393 /* A macro to walk a list of skbs. */ 394 #define sctp_skb_for_each(pos, head, tmp) \ 395 skb_queue_walk_safe(head, pos, tmp) 396 397 /** 398 * sctp_list_dequeue - remove from the head of the queue 399 * @list: list to dequeue from 400 * 401 * Remove the head of the list. The head item is 402 * returned or %NULL if the list is empty. 403 */ 404 405 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 406 { 407 struct list_head *result = NULL; 408 409 if (!list_empty(list)) { 410 result = list->next; 411 list_del_init(result); 412 } 413 return result; 414 } 415 416 /* SCTP version of skb_set_owner_r. We need this one because 417 * of the way we have to do receive buffer accounting on bundled 418 * chunks. 419 */ 420 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 421 { 422 struct sctp_ulpevent *event = sctp_skb2event(skb); 423 424 skb_orphan(skb); 425 skb->sk = sk; 426 skb->destructor = sctp_sock_rfree; 427 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 428 /* 429 * This mimics the behavior of skb_set_owner_r 430 */ 431 sk->sk_forward_alloc -= event->rmem_len; 432 } 433 434 /* Tests if the list has one and only one entry. */ 435 static inline int sctp_list_single_entry(struct list_head *head) 436 { 437 return (head->next != head) && (head->next == head->prev); 438 } 439 440 /* Break down data chunks at this point. */ 441 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 442 { 443 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 444 int frag = pmtu; 445 446 frag -= sp->pf->af->net_header_len; 447 frag -= sizeof(struct sctphdr) + sctp_datachk_len(&asoc->stream); 448 449 if (asoc->user_frag) 450 frag = min_t(int, frag, asoc->user_frag); 451 452 frag = SCTP_TRUNC4(min_t(int, frag, SCTP_MAX_CHUNK_LEN - 453 sctp_datachk_len(&asoc->stream))); 454 455 return frag; 456 } 457 458 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc) 459 { 460 sctp_assoc_sync_pmtu(asoc); 461 asoc->pmtu_pending = 0; 462 } 463 464 static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) 465 { 466 return !list_empty(&chunk->list); 467 } 468 469 /* Walk through a list of TLV parameters. Don't trust the 470 * individual parameter lengths and instead depend on 471 * the chunk length to indicate when to stop. Make sure 472 * there is room for a param header too. 473 */ 474 #define sctp_walk_params(pos, chunk, member)\ 475 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 476 477 #define _sctp_walk_params(pos, chunk, end, member)\ 478 for (pos.v = chunk->member;\ 479 (pos.v + offsetof(struct sctp_paramhdr, length) + sizeof(pos.p->length) <=\ 480 (void *)chunk + end) &&\ 481 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 482 ntohs(pos.p->length) >= sizeof(struct sctp_paramhdr);\ 483 pos.v += SCTP_PAD4(ntohs(pos.p->length))) 484 485 #define sctp_walk_errors(err, chunk_hdr)\ 486 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 487 488 #define _sctp_walk_errors(err, chunk_hdr, end)\ 489 for (err = (struct sctp_errhdr *)((void *)chunk_hdr + \ 490 sizeof(struct sctp_chunkhdr));\ 491 ((void *)err + offsetof(struct sctp_errhdr, length) + sizeof(err->length) <=\ 492 (void *)chunk_hdr + end) &&\ 493 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 494 ntohs(err->length) >= sizeof(struct sctp_errhdr); \ 495 err = (struct sctp_errhdr *)((void *)err + SCTP_PAD4(ntohs(err->length)))) 496 497 #define sctp_walk_fwdtsn(pos, chunk)\ 498 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 499 500 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 501 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 502 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 503 pos++) 504 505 /* External references. */ 506 507 extern struct proto sctp_prot; 508 extern struct proto sctpv6_prot; 509 void sctp_put_port(struct sock *sk); 510 511 extern struct idr sctp_assocs_id; 512 extern spinlock_t sctp_assocs_id_lock; 513 514 /* Static inline functions. */ 515 516 /* Convert from an IP version number to an Address Family symbol. */ 517 static inline int ipver2af(__u8 ipver) 518 { 519 switch (ipver) { 520 case 4: 521 return AF_INET; 522 case 6: 523 return AF_INET6; 524 default: 525 return 0; 526 } 527 } 528 529 /* Convert from an address parameter type to an address family. */ 530 static inline int param_type2af(__be16 type) 531 { 532 switch (type) { 533 case SCTP_PARAM_IPV4_ADDRESS: 534 return AF_INET; 535 case SCTP_PARAM_IPV6_ADDRESS: 536 return AF_INET6; 537 default: 538 return 0; 539 } 540 } 541 542 /* Warning: The following hash functions assume a power of two 'size'. */ 543 /* This is the hash function for the SCTP port hash table. */ 544 static inline int sctp_phashfn(struct net *net, __u16 lport) 545 { 546 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 547 } 548 549 /* This is the hash function for the endpoint hash table. */ 550 static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 551 { 552 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 553 } 554 555 #define sctp_for_each_hentry(epb, head) \ 556 hlist_for_each_entry(epb, head, node) 557 558 /* Is a socket of this style? */ 559 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 560 static inline int __sctp_style(const struct sock *sk, 561 enum sctp_socket_type style) 562 { 563 return sctp_sk(sk)->type == style; 564 } 565 566 /* Is the association in this state? */ 567 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 568 static inline int __sctp_state(const struct sctp_association *asoc, 569 enum sctp_state state) 570 { 571 return asoc->state == state; 572 } 573 574 /* Is the socket in this state? */ 575 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 576 static inline int __sctp_sstate(const struct sock *sk, 577 enum sctp_sock_state state) 578 { 579 return sk->sk_state == state; 580 } 581 582 /* Map v4-mapped v6 address back to v4 address */ 583 static inline void sctp_v6_map_v4(union sctp_addr *addr) 584 { 585 addr->v4.sin_family = AF_INET; 586 addr->v4.sin_port = addr->v6.sin6_port; 587 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 588 } 589 590 /* Map v4 address to v4-mapped v6 address */ 591 static inline void sctp_v4_map_v6(union sctp_addr *addr) 592 { 593 __be16 port; 594 595 port = addr->v4.sin_port; 596 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 597 addr->v6.sin6_port = port; 598 addr->v6.sin6_family = AF_INET6; 599 addr->v6.sin6_flowinfo = 0; 600 addr->v6.sin6_scope_id = 0; 601 addr->v6.sin6_addr.s6_addr32[0] = 0; 602 addr->v6.sin6_addr.s6_addr32[1] = 0; 603 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 604 } 605 606 /* The cookie is always 0 since this is how it's used in the 607 * pmtu code. 608 */ 609 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 610 { 611 if (t->dst && !dst_check(t->dst, t->dst_cookie)) 612 sctp_transport_dst_release(t); 613 614 return t->dst; 615 } 616 617 static inline bool sctp_transport_pmtu_check(struct sctp_transport *t) 618 { 619 __u32 pmtu = max_t(size_t, SCTP_TRUNC4(dst_mtu(t->dst)), 620 SCTP_DEFAULT_MINSEGMENT); 621 622 if (t->pathmtu == pmtu) 623 return true; 624 625 t->pathmtu = pmtu; 626 627 return false; 628 } 629 630 #endif /* __net_sctp_h__ */ 631