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

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