1 /* SCTP kernel reference Implementation
2 * (C) Copyright IBM Corp. 2001, 2003
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 reference Implementation
8 *
9 * The base lksctp header.
10 *
11 * The SCTP reference 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 * The SCTP reference 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
66 #include <linux/config.h>
67
68 #ifdef TEST_FRAME
69 #undef CONFIG_PROC_FS
70 #undef CONFIG_SCTP_DBG_OBJCNT
71 #undef CONFIG_SYSCTL
72 #endif /* TEST_FRAME */
73
74 #include <linux/types.h>
75 #include <linux/slab.h>
76 #include <linux/in.h>
77 #include <linux/tty.h>
78 #include <linux/proc_fs.h>
79 #include <linux/spinlock.h>
80
81 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
82 #include <net/ipv6.h>
83 #include <net/ip6_route.h>
84 #endif
85
86 #include <net/sctp/compat.h>
87 #include <asm/uaccess.h>
88 #include <asm/page.h>
89 #include <net/sock.h>
90 #include <net/snmp.h>
91 #include <net/sctp/structs.h>
92 #include <net/sctp/constants.h>
93
94
95 /* Set SCTP_DEBUG flag via config if not already set. */
96 #ifndef SCTP_DEBUG
97 #ifdef CONFIG_SCTP_DBG_MSG
98 #define SCTP_DEBUG 1
99 #else
100 #define SCTP_DEBUG 0
101 #endif /* CONFIG_SCTP_DBG */
102 #endif /* SCTP_DEBUG */
103
104 #ifdef CONFIG_IP_SCTP_MODULE
105 #define SCTP_PROTOSW_FLAG 0
106 #else /* static! */
107 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
108 #endif
109
110
111 /* Certain internal static functions need to be exported when
112 * compiled into the test frame.
113 */
114 #ifndef SCTP_STATIC
115 #define SCTP_STATIC static
116 #endif
117
118 #define SCTP_MSECS_TO_JIFFIES(msec) \
119 (((msec / 1000) * HZ) + ((msec % 1000) * HZ) / 1000)
120 #define JIFFIES_TO_MSECS(jiff) \
121 (((jiff / HZ) * 1000) + ((jiff % HZ) * 1000) / HZ)
122
123 /*
124 * Function declarations.
125 */
126
127 /*
128 * sctp/protocol.c
129 */
130 extern struct sock *sctp_get_ctl_sock(void);
131 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
132 sctp_scope_t, int gfp, int flags);
133 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
134 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
135
136 /*
137 * sctp/socket.c
138 */
139 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
140 int sctp_inet_listen(struct socket *sock, int backlog);
141 void sctp_write_space(struct sock *sk);
142 unsigned int sctp_poll(struct file *file, struct socket *sock,
143 poll_table *wait);
144
145 /*
146 * sctp/primitive.c
147 */
148 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
149 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
150 int sctp_primitive_ABORT(struct sctp_association *, void *arg);
151 int sctp_primitive_SEND(struct sctp_association *, void *arg);
152 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
153 int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
154
155 /*
156 * sctp/crc32c.c
157 */
158 __u32 sctp_start_cksum(__u8 *ptr, __u16 count);
159 __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum);
160 __u32 sctp_end_cksum(__u32 cksum);
161 __u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum);
162
163 /*
164 * sctp/input.c
165 */
166 int sctp_rcv(struct sk_buff *skb);
167 void sctp_v4_err(struct sk_buff *skb, u32 info);
168 void sctp_hash_established(struct sctp_association *);
169 void sctp_unhash_established(struct sctp_association *);
170 void sctp_hash_endpoint(struct sctp_endpoint *);
171 void sctp_unhash_endpoint(struct sctp_endpoint *);
172 struct sock *sctp_err_lookup(int family, struct sk_buff *,
173 struct sctphdr *, struct sctp_endpoint **,
174 struct sctp_association **,
175 struct sctp_transport **);
176 void sctp_err_finish(struct sock *, struct sctp_endpoint *,
177 struct sctp_association *);
178 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
179 struct sctp_transport *t, __u32 pmtu);
180 void sctp_icmp_proto_unreachable(struct sock *sk,
181 struct sctp_endpoint *ep,
182 struct sctp_association *asoc,
183 struct sctp_transport *t);
184
185 /*
186 * Section: Macros, externs, and inlines
187 */
188
189
190 #ifdef TEST_FRAME
191 #include <test_frame.h>
192 #else
193
194 /* spin lock wrappers. */
195 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
196 #define sctp_spin_unlock_irqrestore(lock, flags) \
197 spin_unlock_irqrestore(lock, flags)
198 #define sctp_local_bh_disable() local_bh_disable()
199 #define sctp_local_bh_enable() local_bh_enable()
200 #define sctp_spin_lock(lock) spin_lock(lock)
201 #define sctp_spin_unlock(lock) spin_unlock(lock)
202 #define sctp_write_lock(lock) write_lock(lock)
203 #define sctp_write_unlock(lock) write_unlock(lock)
204 #define sctp_read_lock(lock) read_lock(lock)
205 #define sctp_read_unlock(lock) read_unlock(lock)
206
207 /* sock lock wrappers. */
208 #define sctp_lock_sock(sk) lock_sock(sk)
209 #define sctp_release_sock(sk) release_sock(sk)
210 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
211 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
212 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk)
213 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk)
214
215 /* SCTP SNMP MIB stats handlers */
216 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
217 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field)
218 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field)
219 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
220 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field)
221
222 /* Determine if this is a valid kernel address. */
sctp_is_valid_kaddr(unsigned long addr)223 static inline int sctp_is_valid_kaddr(unsigned long addr)
224 {
225 struct page *page;
226
227 /* Make sure the address is not in the user address space. */
228 if (addr < PAGE_OFFSET)
229 return 0;
230
231 page = virt_to_page(addr);
232
233 /* Is this page valid? */
234 if (!virt_addr_valid(addr) || PageReserved(page))
235 return 0;
236
237 return 1;
238 }
239
240 #endif /* !TEST_FRAME */
241
242
243 /* Print debugging messages. */
244 #if SCTP_DEBUG
245 extern int sctp_debug_flag;
246 #define SCTP_DEBUG_PRINTK(whatever...) \
247 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
248 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
249 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
250
251 #define SCTP_ASSERT(expr, str, func) \
252 if (!(expr)) { \
253 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
254 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \
255 func; \
256 }
257
258 #else /* SCTP_DEBUG */
259
260 #define SCTP_DEBUG_PRINTK(whatever...)
261 #define SCTP_ENABLE_DEBUG
262 #define SCTP_DISABLE_DEBUG
263 #define SCTP_ASSERT(expr, str, func)
264
265 #endif /* SCTP_DEBUG */
266
267
268 /*
269 * Macros for keeping a global reference of object allocations.
270 */
271 #ifdef CONFIG_SCTP_DBG_OBJCNT
272
273 extern atomic_t sctp_dbg_objcnt_sock;
274 extern atomic_t sctp_dbg_objcnt_ep;
275 extern atomic_t sctp_dbg_objcnt_assoc;
276 extern atomic_t sctp_dbg_objcnt_transport;
277 extern atomic_t sctp_dbg_objcnt_chunk;
278 extern atomic_t sctp_dbg_objcnt_bind_addr;
279 extern atomic_t sctp_dbg_objcnt_addr;
280 extern atomic_t sctp_dbg_objcnt_ssnmap;
281 extern atomic_t sctp_dbg_objcnt_datamsg;
282
283 /* Macros to atomically increment/decrement objcnt counters. */
284 #define SCTP_DBG_OBJCNT_INC(name) \
285 atomic_inc(&sctp_dbg_objcnt_## name)
286 #define SCTP_DBG_OBJCNT_DEC(name) \
287 atomic_dec(&sctp_dbg_objcnt_## name)
288 #define SCTP_DBG_OBJCNT(name) \
289 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
290
291 /* Macro to help create new entries in in the global array of
292 * objcnt counters.
293 */
294 #define SCTP_DBG_OBJCNT_ENTRY(name) \
295 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
296
297 void sctp_dbg_objcnt_init(void);
298 void sctp_dbg_objcnt_exit(void);
299
300 #else
301
302 #define SCTP_DBG_OBJCNT_INC(name)
303 #define SCTP_DBG_OBJCNT_DEC(name)
304
sctp_dbg_objcnt_init(void)305 static inline void sctp_dbg_objcnt_init(void) { return; }
sctp_dbg_objcnt_exit(void)306 static inline void sctp_dbg_objcnt_exit(void) { return; }
307
308 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
309
310 #if defined CONFIG_SYSCTL
311 void sctp_sysctl_register(void);
312 void sctp_sysctl_unregister(void);
313 #else
sctp_sysctl_register(void)314 static inline void sctp_sysctl_register(void) { return; }
sctp_sysctl_unregister(void)315 static inline void sctp_sysctl_unregister(void) { return; }
sctp_sysctl_jiffies_ms(ctl_table * table,int * name,int nlen,void * oldval,size_t * oldlenp,void * newval,size_t newlen,void ** context)316 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int *name, int nlen,
317 void *oldval, size_t *oldlenp, void *newval,
318 size_t newlen, void **context)
319 {
320 return -ENOSYS;
321 }
322 #endif
323
324 /* Size of Supported Address Parameter for 'x' address types. */
325 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
326
327 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
328
329 int sctp_v6_init(void);
330 void sctp_v6_exit(void);
331
332 #else /* #ifdef defined(CONFIG_IPV6) */
333
sctp_v6_init(void)334 static inline int sctp_v6_init(void) { return 0; }
sctp_v6_exit(void)335 static inline void sctp_v6_exit(void) { return; }
336
337 #endif /* #if defined(CONFIG_IPV6) */
338
339 /* Some wrappers, in case crypto not available. */
340 #if defined (CONFIG_CRYPTO_HMAC)
341 #define sctp_crypto_alloc_tfm crypto_alloc_tfm
342 #define sctp_crypto_free_tfm crypto_free_tfm
343 #define sctp_crypto_hmac crypto_hmac
344 #else
345 #define sctp_crypto_alloc_tfm(x...) NULL
346 #define sctp_crypto_free_tfm(x...)
347 #define sctp_crypto_hmac(x...)
348 #endif
349
350
351 /* Map an association to an assoc_id. */
sctp_assoc2id(const struct sctp_association * asoc)352 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
353 {
354 return (sctp_assoc_t) asoc;
355 }
356
357 /* Look up the association by its id. */
358 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
359
360
361 /* A macro to walk a list of skbs. */
362 #define sctp_skb_for_each(pos, head, tmp) \
363 for (pos = (head)->next;\
364 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\
365 pos = tmp)
366
367
368 /* A helper to append an entire skb list (list) to another (head). */
sctp_skb_list_tail(struct sk_buff_head * list,struct sk_buff_head * head)369 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
370 struct sk_buff_head *head)
371 {
372 unsigned long flags;
373
374 sctp_spin_lock_irqsave(&head->lock, flags);
375 sctp_spin_lock(&list->lock);
376
377 list_splice((struct list_head *)list, (struct list_head *)head->prev);
378
379 head->qlen += list->qlen;
380 list->qlen = 0;
381
382 sctp_spin_unlock(&list->lock);
383 sctp_spin_unlock_irqrestore(&head->lock, flags);
384 }
385
386 /**
387 * sctp_list_dequeue - remove from the head of the queue
388 * @list: list to dequeue from
389 *
390 * Remove the head of the list. The head item is
391 * returned or %NULL if the list is empty.
392 */
393
sctp_list_dequeue(struct list_head * list)394 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
395 {
396 struct list_head *result = NULL;
397
398 if (list->next != list) {
399 result = list->next;
400 list->next = result->next;
401 list->next->prev = list;
402 INIT_LIST_HEAD(result);
403 }
404 return result;
405 }
406
407 /* Tests if the list has one and only one entry. */
sctp_list_single_entry(struct list_head * head)408 static inline int sctp_list_single_entry(struct list_head *head)
409 {
410 return ((head->next != head) && (head->next == head->prev));
411 }
412
413 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
sctp_jitter(__u32 rto)414 static inline __s32 sctp_jitter(__u32 rto)
415 {
416 static __u32 sctp_rand;
417 __s32 ret;
418
419 /* Avoid divide by zero. */
420 if (!rto)
421 rto = 1;
422
423 sctp_rand += jiffies;
424 sctp_rand ^= (sctp_rand << 12);
425 sctp_rand ^= (sctp_rand >> 20);
426
427 /* Choose random number from 0 to rto, then move to -50% ~ +50%
428 * of rto.
429 */
430 ret = sctp_rand % rto - (rto >> 1);
431 return ret;
432 }
433
434 /* Break down data chunks at this point. */
sctp_frag_point(const struct sctp_opt * sp,int pmtu)435 static inline int sctp_frag_point(const struct sctp_opt *sp, int pmtu)
436 {
437 int frag = pmtu;
438
439 frag -= sp->pf->af->net_header_len;
440 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
441
442 if (sp->user_frag)
443 frag = min_t(int, frag, sp->user_frag);
444
445 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
446
447 return frag;
448 }
449
450 /* Walk through a list of TLV parameters. Don't trust the
451 * individual parameter lengths and instead depend on
452 * the chunk length to indicate when to stop. Make sure
453 * there is room for a param header too.
454 */
455 #define sctp_walk_params(pos, chunk, member)\
456 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
457
458 #define _sctp_walk_params(pos, chunk, end, member)\
459 for (pos.v = chunk->member;\
460 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\
461 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
462 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
463 pos.v += WORD_ROUND(ntohs(pos.p->length)))
464
465 #define sctp_walk_errors(err, chunk_hdr)\
466 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
467
468 #define _sctp_walk_errors(err, chunk_hdr, end)\
469 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
470 sizeof(sctp_chunkhdr_t));\
471 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\
472 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
473 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
474 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
475
476 #define sctp_walk_fwdtsn(pos, chunk)\
477 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
478
479 #define _sctp_walk_fwdtsn(pos, chunk, end)\
480 for (pos = chunk->subh.fwdtsn_hdr->skip;\
481 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
482 pos++)
483
484 /* Round an int up to the next multiple of 4. */
485 #define WORD_ROUND(s) (((s)+3)&~3)
486
487 /* Make a new instance of type. */
488 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags)
489
490 /* Compare two timevals. */
491 #define tv_lt(s, t) \
492 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
493
494 /* Add tv1 to tv2. */
495 #define TIMEVAL_ADD(tv1, tv2) \
496 ({ \
497 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
498 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
499 \
500 if (usecs >= 1000000) { \
501 usecs -= 1000000; \
502 secs++; \
503 } \
504 (tv2).tv_sec = secs; \
505 (tv2).tv_usec = usecs; \
506 })
507
508 /* External references. */
509
510 extern struct proto sctp_prot;
511 extern struct proc_dir_entry *proc_net_sctp;
512 void sctp_put_port(struct sock *sk);
513
514 /* Static inline functions. */
515
516 /* Convert from an IP version number to an Address Family symbol. */
ipver2af(__u8 ipver)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. */
param_type2af(__u16 type)530 static inline int param_type2af(__u16 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 /* Perform some sanity checks. */
sctp_sanity_check(void)543 static inline int sctp_sanity_check(void)
544 {
545 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
546 sizeof(((struct sk_buff *)0)->cb),
547 "SCTP: ulpevent does not fit in skb!\n", return 0);
548
549 return 1;
550 }
551
552 /* Warning: The following hash functions assume a power of two 'size'. */
553 /* This is the hash function for the SCTP port hash table. */
sctp_phashfn(__u16 lport)554 static inline int sctp_phashfn(__u16 lport)
555 {
556 return (lport & (sctp_port_hashsize - 1));
557 }
558
559 /* This is the hash function for the endpoint hash table. */
sctp_ep_hashfn(__u16 lport)560 static inline int sctp_ep_hashfn(__u16 lport)
561 {
562 return (lport & (sctp_ep_hashsize - 1));
563 }
564
565 /* This is the hash function for the association hash table. */
sctp_assoc_hashfn(__u16 lport,__u16 rport)566 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
567 {
568 int h = (lport << 16) + rport;
569 h ^= h>>8;
570 return (h & (sctp_assoc_hashsize - 1));
571 }
572
573 /* This is the hash function for the association hash table. This is
574 * not used yet, but could be used as a better hash function when
575 * we have a vtag.
576 */
sctp_vtag_hashfn(__u16 lport,__u16 rport,__u32 vtag)577 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
578 {
579 int h = (lport << 16) + rport;
580 h ^= vtag;
581 return (h & (sctp_assoc_hashsize-1));
582 }
583
584 #define sctp_sk(__sk) (&(((struct sock *)__sk)->tp_pinfo.af_sctp))
585 #define sctp_opt2sk(__sp) container_of(__sp, struct sock, tp_pinfo.af_sctp)
586
587 /* Is a socket of this style? */
588 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
__sctp_style(const struct sock * sk,sctp_socket_type_t style)589 int static inline __sctp_style(const struct sock *sk, sctp_socket_type_t style)
590 {
591 return sctp_sk(sk)->type == style;
592 }
593
594 /* Is the association in this state? */
595 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
__sctp_state(const struct sctp_association * asoc,sctp_state_t state)596 int static inline __sctp_state(const struct sctp_association *asoc,
597 sctp_state_t state)
598 {
599 return asoc->state == state;
600 }
601
602 /* Is the socket in this state? */
603 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
__sctp_sstate(const struct sock * sk,sctp_sock_state_t state)604 int static inline __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
605 {
606 return sk->state == state;
607 }
608
609 /* Map v4-mapped v6 address back to v4 address */
sctp_v6_map_v4(union sctp_addr * addr)610 static inline void sctp_v6_map_v4(union sctp_addr *addr)
611 {
612 addr->v4.sin_family = AF_INET;
613 addr->v4.sin_port = addr->v6.sin6_port;
614 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
615 }
616
617 /* Map v4 address to v4-mapped v6 address */
sctp_v4_map_v6(union sctp_addr * addr)618 static inline void sctp_v4_map_v6(union sctp_addr *addr)
619 {
620 addr->v6.sin6_family = AF_INET6;
621 addr->v6.sin6_port = addr->v4.sin_port;
622 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
623 addr->v6.sin6_addr.s6_addr32[0] = 0;
624 addr->v6.sin6_addr.s6_addr32[1] = 0;
625 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
626 }
627
628 #endif /* __net_sctp_h__ */
629