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TOMOYO Linux Cross Reference
Linux/include/net/sctp/sctp.h

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  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 <asm/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 /*
 86  * Function declarations.
 87  */
 88 
 89 /*
 90  * sctp/protocol.c
 91  */
 92 int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *,
 93                               sctp_scope_t, gfp_t gfp, int flags);
 94 struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
 95 int sctp_register_pf(struct sctp_pf *, sa_family_t);
 96 void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int);
 97 
 98 /*
 99  * sctp/socket.c
100  */
101 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
102 int sctp_inet_listen(struct socket *sock, int backlog);
103 void sctp_write_space(struct sock *sk);
104 void sctp_data_ready(struct sock *sk);
105 unsigned int sctp_poll(struct file *file, struct socket *sock,
106                 poll_table *wait);
107 void sctp_sock_rfree(struct sk_buff *skb);
108 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
109                     struct sctp_association *asoc);
110 extern struct percpu_counter sctp_sockets_allocated;
111 int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
112 
113 /*
114  * sctp/primitive.c
115  */
116 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg);
117 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg);
118 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg);
119 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg);
120 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg);
121 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg);
122 
123 /*
124  * sctp/input.c
125  */
126 int sctp_rcv(struct sk_buff *skb);
127 void sctp_v4_err(struct sk_buff *skb, u32 info);
128 void sctp_hash_established(struct sctp_association *);
129 void sctp_unhash_established(struct sctp_association *);
130 void sctp_hash_endpoint(struct sctp_endpoint *);
131 void sctp_unhash_endpoint(struct sctp_endpoint *);
132 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
133                              struct sctphdr *, struct sctp_association **,
134                              struct sctp_transport **);
135 void sctp_err_finish(struct sock *, struct sctp_association *);
136 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
137                            struct sctp_transport *t, __u32 pmtu);
138 void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
139                         struct sk_buff *);
140 void sctp_icmp_proto_unreachable(struct sock *sk,
141                                  struct sctp_association *asoc,
142                                  struct sctp_transport *t);
143 void sctp_backlog_migrate(struct sctp_association *assoc,
144                           struct sock *oldsk, struct sock *newsk);
145 
146 /*
147  * sctp/proc.c
148  */
149 int sctp_snmp_proc_init(struct net *net);
150 void sctp_snmp_proc_exit(struct net *net);
151 int sctp_eps_proc_init(struct net *net);
152 void sctp_eps_proc_exit(struct net *net);
153 int sctp_assocs_proc_init(struct net *net);
154 void sctp_assocs_proc_exit(struct net *net);
155 int sctp_remaddr_proc_init(struct net *net);
156 void sctp_remaddr_proc_exit(struct net *net);
157 
158 
159 /*
160  * Module global variables
161  */
162 
163  /*
164   * sctp/protocol.c
165   */
166 extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
167 extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
168 
169 /*
170  *  Section:  Macros, externs, and inlines
171  */
172 
173 /* SCTP SNMP MIB stats handlers */
174 #define SCTP_INC_STATS(net, field)      SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
175 #define SCTP_INC_STATS_BH(net, field)   SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field)
176 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field)
177 #define SCTP_DEC_STATS(net, field)      SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
178 
179 /* sctp mib definitions */
180 enum {
181         SCTP_MIB_NUM = 0,
182         SCTP_MIB_CURRESTAB,                     /* CurrEstab */
183         SCTP_MIB_ACTIVEESTABS,                  /* ActiveEstabs */
184         SCTP_MIB_PASSIVEESTABS,                 /* PassiveEstabs */
185         SCTP_MIB_ABORTEDS,                      /* Aborteds */
186         SCTP_MIB_SHUTDOWNS,                     /* Shutdowns */
187         SCTP_MIB_OUTOFBLUES,                    /* OutOfBlues */
188         SCTP_MIB_CHECKSUMERRORS,                /* ChecksumErrors */
189         SCTP_MIB_OUTCTRLCHUNKS,                 /* OutCtrlChunks */
190         SCTP_MIB_OUTORDERCHUNKS,                /* OutOrderChunks */
191         SCTP_MIB_OUTUNORDERCHUNKS,              /* OutUnorderChunks */
192         SCTP_MIB_INCTRLCHUNKS,                  /* InCtrlChunks */
193         SCTP_MIB_INORDERCHUNKS,                 /* InOrderChunks */
194         SCTP_MIB_INUNORDERCHUNKS,               /* InUnorderChunks */
195         SCTP_MIB_FRAGUSRMSGS,                   /* FragUsrMsgs */
196         SCTP_MIB_REASMUSRMSGS,                  /* ReasmUsrMsgs */
197         SCTP_MIB_OUTSCTPPACKS,                  /* OutSCTPPacks */
198         SCTP_MIB_INSCTPPACKS,                   /* InSCTPPacks */
199         SCTP_MIB_T1_INIT_EXPIREDS,
200         SCTP_MIB_T1_COOKIE_EXPIREDS,
201         SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
202         SCTP_MIB_T3_RTX_EXPIREDS,
203         SCTP_MIB_T4_RTO_EXPIREDS,
204         SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
205         SCTP_MIB_DELAY_SACK_EXPIREDS,
206         SCTP_MIB_AUTOCLOSE_EXPIREDS,
207         SCTP_MIB_T1_RETRANSMITS,
208         SCTP_MIB_T3_RETRANSMITS,
209         SCTP_MIB_PMTUD_RETRANSMITS,
210         SCTP_MIB_FAST_RETRANSMITS,
211         SCTP_MIB_IN_PKT_SOFTIRQ,
212         SCTP_MIB_IN_PKT_BACKLOG,
213         SCTP_MIB_IN_PKT_DISCARDS,
214         SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
215         __SCTP_MIB_MAX
216 };
217 
218 #define SCTP_MIB_MAX    __SCTP_MIB_MAX
219 struct sctp_mib {
220         unsigned long   mibs[SCTP_MIB_MAX];
221 };
222 
223 /* helper function to track stats about max rto and related transport */
224 static inline void sctp_max_rto(struct sctp_association *asoc,
225                                 struct sctp_transport *trans)
226 {
227         if (asoc->stats.max_obs_rto < (__u64)trans->rto) {
228                 asoc->stats.max_obs_rto = trans->rto;
229                 memset(&asoc->stats.obs_rto_ipaddr, 0,
230                         sizeof(struct sockaddr_storage));
231                 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr,
232                         trans->af_specific->sockaddr_len);
233         }
234 }
235 
236 /*
237  * Macros for keeping a global reference of object allocations.
238  */
239 #ifdef CONFIG_SCTP_DBG_OBJCNT
240 
241 extern atomic_t sctp_dbg_objcnt_sock;
242 extern atomic_t sctp_dbg_objcnt_ep;
243 extern atomic_t sctp_dbg_objcnt_assoc;
244 extern atomic_t sctp_dbg_objcnt_transport;
245 extern atomic_t sctp_dbg_objcnt_chunk;
246 extern atomic_t sctp_dbg_objcnt_bind_addr;
247 extern atomic_t sctp_dbg_objcnt_bind_bucket;
248 extern atomic_t sctp_dbg_objcnt_addr;
249 extern atomic_t sctp_dbg_objcnt_ssnmap;
250 extern atomic_t sctp_dbg_objcnt_datamsg;
251 extern atomic_t sctp_dbg_objcnt_keys;
252 
253 /* Macros to atomically increment/decrement objcnt counters.  */
254 #define SCTP_DBG_OBJCNT_INC(name) \
255 atomic_inc(&sctp_dbg_objcnt_## name)
256 #define SCTP_DBG_OBJCNT_DEC(name) \
257 atomic_dec(&sctp_dbg_objcnt_## name)
258 #define SCTP_DBG_OBJCNT(name) \
259 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
260 
261 /* Macro to help create new entries in in the global array of
262  * objcnt counters.
263  */
264 #define SCTP_DBG_OBJCNT_ENTRY(name) \
265 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
266 
267 void sctp_dbg_objcnt_init(struct net *);
268 void sctp_dbg_objcnt_exit(struct net *);
269 
270 #else
271 
272 #define SCTP_DBG_OBJCNT_INC(name)
273 #define SCTP_DBG_OBJCNT_DEC(name)
274 
275 static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
276 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; }
277 
278 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
279 
280 #if defined CONFIG_SYSCTL
281 void sctp_sysctl_register(void);
282 void sctp_sysctl_unregister(void);
283 int sctp_sysctl_net_register(struct net *net);
284 void sctp_sysctl_net_unregister(struct net *net);
285 #else
286 static inline void sctp_sysctl_register(void) { return; }
287 static inline void sctp_sysctl_unregister(void) { return; }
288 static inline int sctp_sysctl_net_register(struct net *net) { return 0; }
289 static inline void sctp_sysctl_net_unregister(struct net *net) { return; }
290 #endif
291 
292 /* Size of Supported Address Parameter for 'x' address types. */
293 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
294 
295 #if IS_ENABLED(CONFIG_IPV6)
296 
297 void sctp_v6_pf_init(void);
298 void sctp_v6_pf_exit(void);
299 int sctp_v6_protosw_init(void);
300 void sctp_v6_protosw_exit(void);
301 int sctp_v6_add_protocol(void);
302 void sctp_v6_del_protocol(void);
303 
304 #else /* #ifdef defined(CONFIG_IPV6) */
305 
306 static inline void sctp_v6_pf_init(void) { return; }
307 static inline void sctp_v6_pf_exit(void) { return; }
308 static inline int sctp_v6_protosw_init(void) { return 0; }
309 static inline void sctp_v6_protosw_exit(void) { return; }
310 static inline int sctp_v6_add_protocol(void) { return 0; }
311 static inline void sctp_v6_del_protocol(void) { return; }
312 
313 #endif /* #if defined(CONFIG_IPV6) */
314 
315 
316 /* Map an association to an assoc_id. */
317 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
318 {
319         return asoc ? asoc->assoc_id : 0;
320 }
321 
322 /* Look up the association by its id.  */
323 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
324 
325 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
326 
327 /* A macro to walk a list of skbs.  */
328 #define sctp_skb_for_each(pos, head, tmp) \
329         skb_queue_walk_safe(head, pos, tmp)
330 
331 /* A helper to append an entire skb list (list) to another (head). */
332 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
333                                       struct sk_buff_head *head)
334 {
335         unsigned long flags;
336 
337         spin_lock_irqsave(&head->lock, flags);
338         spin_lock(&list->lock);
339 
340         skb_queue_splice_tail_init(list, head);
341 
342         spin_unlock(&list->lock);
343         spin_unlock_irqrestore(&head->lock, flags);
344 }
345 
346 /**
347  *      sctp_list_dequeue - remove from the head of the queue
348  *      @list: list to dequeue from
349  *
350  *      Remove the head of the list. The head item is
351  *      returned or %NULL if the list is empty.
352  */
353 
354 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
355 {
356         struct list_head *result = NULL;
357 
358         if (list->next != list) {
359                 result = list->next;
360                 list->next = result->next;
361                 list->next->prev = list;
362                 INIT_LIST_HEAD(result);
363         }
364         return result;
365 }
366 
367 /* SCTP version of skb_set_owner_r.  We need this one because
368  * of the way we have to do receive buffer accounting on bundled
369  * chunks.
370  */
371 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
372 {
373         struct sctp_ulpevent *event = sctp_skb2event(skb);
374 
375         skb_orphan(skb);
376         skb->sk = sk;
377         skb->destructor = sctp_sock_rfree;
378         atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
379         /*
380          * This mimics the behavior of skb_set_owner_r
381          */
382         sk->sk_forward_alloc -= event->rmem_len;
383 }
384 
385 /* Tests if the list has one and only one entry. */
386 static inline int sctp_list_single_entry(struct list_head *head)
387 {
388         return (head->next != head) && (head->next == head->prev);
389 }
390 
391 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
392 static inline __s32 sctp_jitter(__u32 rto)
393 {
394         static __u32 sctp_rand;
395         __s32 ret;
396 
397         /* Avoid divide by zero. */
398         if (!rto)
399                 rto = 1;
400 
401         sctp_rand += jiffies;
402         sctp_rand ^= (sctp_rand << 12);
403         sctp_rand ^= (sctp_rand >> 20);
404 
405         /* Choose random number from 0 to rto, then move to -50% ~ +50%
406          * of rto.
407          */
408         ret = sctp_rand % rto - (rto >> 1);
409         return ret;
410 }
411 
412 /* Break down data chunks at this point.  */
413 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
414 {
415         struct sctp_sock *sp = sctp_sk(asoc->base.sk);
416         int frag = pmtu;
417 
418         frag -= sp->pf->af->net_header_len;
419         frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
420 
421         if (asoc->user_frag)
422                 frag = min_t(int, frag, asoc->user_frag);
423 
424         frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
425 
426         return frag;
427 }
428 
429 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc)
430 {
431 
432         sctp_assoc_sync_pmtu(sk, asoc);
433         asoc->pmtu_pending = 0;
434 }
435 
436 static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk)
437 {
438         return !list_empty(&chunk->list);
439 }
440 
441 /* Walk through a list of TLV parameters.  Don't trust the
442  * individual parameter lengths and instead depend on
443  * the chunk length to indicate when to stop.  Make sure
444  * there is room for a param header too.
445  */
446 #define sctp_walk_params(pos, chunk, member)\
447 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
448 
449 #define _sctp_walk_params(pos, chunk, end, member)\
450 for (pos.v = chunk->member;\
451      (pos.v + offsetof(struct sctp_paramhdr, length) + sizeof(pos.p->length) <=\
452       (void *)chunk + end) &&\
453      pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
454      ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
455      pos.v += WORD_ROUND(ntohs(pos.p->length)))
456 
457 #define sctp_walk_errors(err, chunk_hdr)\
458 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
459 
460 #define _sctp_walk_errors(err, chunk_hdr, end)\
461 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
462             sizeof(sctp_chunkhdr_t));\
463      ((void *)err + offsetof(sctp_errhdr_t, length) + sizeof(err->length) <=\
464       (void *)chunk_hdr + end) &&\
465      (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
466      ntohs(err->length) >= sizeof(sctp_errhdr_t); \
467      err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
468 
469 #define sctp_walk_fwdtsn(pos, chunk)\
470 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
471 
472 #define _sctp_walk_fwdtsn(pos, chunk, end)\
473 for (pos = chunk->subh.fwdtsn_hdr->skip;\
474      (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
475      pos++)
476 
477 /* Round an int up to the next multiple of 4.  */
478 #define WORD_ROUND(s) (((s)+3)&~3)
479 
480 /* External references. */
481 
482 extern struct proto sctp_prot;
483 extern struct proto sctpv6_prot;
484 void sctp_put_port(struct sock *sk);
485 
486 extern struct idr sctp_assocs_id;
487 extern spinlock_t sctp_assocs_id_lock;
488 
489 /* Static inline functions. */
490 
491 /* Convert from an IP version number to an Address Family symbol.  */
492 static inline int ipver2af(__u8 ipver)
493 {
494         switch (ipver) {
495         case 4:
496                 return  AF_INET;
497         case 6:
498                 return AF_INET6;
499         default:
500                 return 0;
501         }
502 }
503 
504 /* Convert from an address parameter type to an address family.  */
505 static inline int param_type2af(__be16 type)
506 {
507         switch (type) {
508         case SCTP_PARAM_IPV4_ADDRESS:
509                 return  AF_INET;
510         case SCTP_PARAM_IPV6_ADDRESS:
511                 return AF_INET6;
512         default:
513                 return 0;
514         }
515 }
516 
517 /* Warning: The following hash functions assume a power of two 'size'. */
518 /* This is the hash function for the SCTP port hash table. */
519 static inline int sctp_phashfn(struct net *net, __u16 lport)
520 {
521         return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
522 }
523 
524 /* This is the hash function for the endpoint hash table. */
525 static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
526 {
527         return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
528 }
529 
530 /* This is the hash function for the association hash table. */
531 static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport)
532 {
533         int h = (lport << 16) + rport + net_hash_mix(net);
534         h ^= h>>8;
535         return h & (sctp_assoc_hashsize - 1);
536 }
537 
538 /* This is the hash function for the association hash table.  This is
539  * not used yet, but could be used as a better hash function when
540  * we have a vtag.
541  */
542 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
543 {
544         int h = (lport << 16) + rport;
545         h ^= vtag;
546         return h & (sctp_assoc_hashsize - 1);
547 }
548 
549 #define sctp_for_each_hentry(epb, head) \
550         hlist_for_each_entry(epb, head, node)
551 
552 /* Is a socket of this style? */
553 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
554 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
555 {
556         return sctp_sk(sk)->type == style;
557 }
558 
559 /* Is the association in this state? */
560 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
561 static inline int __sctp_state(const struct sctp_association *asoc,
562                                sctp_state_t state)
563 {
564         return asoc->state == state;
565 }
566 
567 /* Is the socket in this state? */
568 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
569 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
570 {
571         return sk->sk_state == state;
572 }
573 
574 /* Map v4-mapped v6 address back to v4 address */
575 static inline void sctp_v6_map_v4(union sctp_addr *addr)
576 {
577         addr->v4.sin_family = AF_INET;
578         addr->v4.sin_port = addr->v6.sin6_port;
579         addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
580 }
581 
582 /* Map v4 address to v4-mapped v6 address */
583 static inline void sctp_v4_map_v6(union sctp_addr *addr)
584 {
585         __be16 port;
586 
587         port = addr->v4.sin_port;
588         addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
589         addr->v6.sin6_port = port;
590         addr->v6.sin6_family = AF_INET6;
591         addr->v6.sin6_flowinfo = 0;
592         addr->v6.sin6_scope_id = 0;
593         addr->v6.sin6_addr.s6_addr32[0] = 0;
594         addr->v6.sin6_addr.s6_addr32[1] = 0;
595         addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
596 }
597 
598 /* The cookie is always 0 since this is how it's used in the
599  * pmtu code.
600  */
601 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
602 {
603         if (t->dst && !dst_check(t->dst, t->dst_cookie)) {
604                 dst_release(t->dst);
605                 t->dst = NULL;
606         }
607 
608         return t->dst;
609 }
610 
611 #endif /* __net_sctp_h__ */
612 

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