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
66
67 #ifdef TEST_FRAME
68 #undef CONFIG_SCTP_DBG_OBJCNT
69 #undef CONFIG_SYSCTL
70 #endif /* TEST_FRAME */
71
72 #include <linux/types.h>
73 #include <linux/slab.h>
74 #include <linux/in.h>
75 #include <linux/tty.h>
76 #include <linux/proc_fs.h>
77 #include <linux/spinlock.h>
78 #include <linux/jiffies.h>
79 #include <linux/idr.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 <asm/uaccess.h>
87 #include <asm/page.h>
88 #include <net/sock.h>
89 #include <net/snmp.h>
90 #include <net/sctp/structs.h>
91 #include <net/sctp/constants.h>
92
93
94 /* Set SCTP_DEBUG flag via config if not already set. */
95 #ifndef SCTP_DEBUG
96 #ifdef CONFIG_SCTP_DBG_MSG
97 #define SCTP_DEBUG 1
98 #else
99 #define SCTP_DEBUG 0
100 #endif /* CONFIG_SCTP_DBG */
101 #endif /* SCTP_DEBUG */
102
103 #ifdef CONFIG_IP_SCTP_MODULE
104 #define SCTP_PROTOSW_FLAG 0
105 #else /* static! */
106 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
107 #endif
108
109
110 /* Certain internal static functions need to be exported when
111 * compiled into the test frame.
112 */
113 #ifndef SCTP_STATIC
114 #define SCTP_STATIC static
115 #endif
116
117 /*
118 * Function declarations.
119 */
120
121 /*
122 * sctp/protocol.c
123 */
124 extern struct sock *sctp_get_ctl_sock(void);
125 extern void sctp_local_addr_free(struct rcu_head *head);
126 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
127 sctp_scope_t, gfp_t gfp,
128 int flags);
129 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
130 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
131
132 /*
133 * sctp/socket.c
134 */
135 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
136 int sctp_inet_listen(struct socket *sock, int backlog);
137 void sctp_write_space(struct sock *sk);
138 unsigned int sctp_poll(struct file *file, struct socket *sock,
139 poll_table *wait);
140 void sctp_sock_rfree(struct sk_buff *skb);
141 extern struct percpu_counter sctp_sockets_allocated;
142
143 /*
144 * sctp/primitive.c
145 */
146 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
147 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
148 int sctp_primitive_ABORT(struct sctp_association *, void *arg);
149 int sctp_primitive_SEND(struct sctp_association *, void *arg);
150 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
151 int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
152
153 /*
154 * sctp/input.c
155 */
156 int sctp_rcv(struct sk_buff *skb);
157 void sctp_v4_err(struct sk_buff *skb, u32 info);
158 void sctp_hash_established(struct sctp_association *);
159 void sctp_unhash_established(struct sctp_association *);
160 void sctp_hash_endpoint(struct sctp_endpoint *);
161 void sctp_unhash_endpoint(struct sctp_endpoint *);
162 struct sock *sctp_err_lookup(int family, struct sk_buff *,
163 struct sctphdr *, struct sctp_association **,
164 struct sctp_transport **);
165 void sctp_err_finish(struct sock *, struct sctp_association *);
166 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
167 struct sctp_transport *t, __u32 pmtu);
168 void sctp_icmp_proto_unreachable(struct sock *sk,
169 struct sctp_association *asoc,
170 struct sctp_transport *t);
171 void sctp_backlog_migrate(struct sctp_association *assoc,
172 struct sock *oldsk, struct sock *newsk);
173
174 /*
175 * sctp/proc.c
176 */
177 int sctp_snmp_proc_init(void);
178 void sctp_snmp_proc_exit(void);
179 int sctp_eps_proc_init(void);
180 void sctp_eps_proc_exit(void);
181 int sctp_assocs_proc_init(void);
182 void sctp_assocs_proc_exit(void);
183 int sctp_remaddr_proc_init(void);
184 void sctp_remaddr_proc_exit(void);
185
186
187 /*
188 * Module global variables
189 */
190
191 /*
192 * sctp/protocol.c
193 */
194 extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
195 extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
196
197 /*
198 * Section: Macros, externs, and inlines
199 */
200
201
202 #ifdef TEST_FRAME
203 #include <test_frame.h>
204 #else
205
206 /* spin lock wrappers. */
207 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
208 #define sctp_spin_unlock_irqrestore(lock, flags) \
209 spin_unlock_irqrestore(lock, flags)
210 #define sctp_local_bh_disable() local_bh_disable()
211 #define sctp_local_bh_enable() local_bh_enable()
212 #define sctp_spin_lock(lock) spin_lock(lock)
213 #define sctp_spin_unlock(lock) spin_unlock(lock)
214 #define sctp_write_lock(lock) write_lock(lock)
215 #define sctp_write_unlock(lock) write_unlock(lock)
216 #define sctp_read_lock(lock) read_lock(lock)
217 #define sctp_read_unlock(lock) read_unlock(lock)
218
219 /* sock lock wrappers. */
220 #define sctp_lock_sock(sk) lock_sock(sk)
221 #define sctp_release_sock(sk) release_sock(sk)
222 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
223 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
224
225 /* SCTP SNMP MIB stats handlers */
226 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
227 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field)
228 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field)
229 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
230 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field)
231
232 #endif /* !TEST_FRAME */
233
234 /* sctp mib definitions */
235 enum
236 {
237 SCTP_MIB_NUM = 0,
238 SCTP_MIB_CURRESTAB, /* CurrEstab */
239 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
240 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
241 SCTP_MIB_ABORTEDS, /* Aborteds */
242 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
243 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
244 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
245 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
246 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
247 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
248 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
249 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
250 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
251 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
252 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
253 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
254 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
255 SCTP_MIB_T1_INIT_EXPIREDS,
256 SCTP_MIB_T1_COOKIE_EXPIREDS,
257 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
258 SCTP_MIB_T3_RTX_EXPIREDS,
259 SCTP_MIB_T4_RTO_EXPIREDS,
260 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
261 SCTP_MIB_DELAY_SACK_EXPIREDS,
262 SCTP_MIB_AUTOCLOSE_EXPIREDS,
263 SCTP_MIB_T1_RETRANSMITS,
264 SCTP_MIB_T3_RETRANSMITS,
265 SCTP_MIB_PMTUD_RETRANSMITS,
266 SCTP_MIB_FAST_RETRANSMITS,
267 SCTP_MIB_IN_PKT_SOFTIRQ,
268 SCTP_MIB_IN_PKT_BACKLOG,
269 SCTP_MIB_IN_PKT_DISCARDS,
270 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
271 __SCTP_MIB_MAX
272 };
273
274 #define SCTP_MIB_MAX __SCTP_MIB_MAX
275 struct sctp_mib {
276 unsigned long mibs[SCTP_MIB_MAX];
277 } __SNMP_MIB_ALIGN__;
278
279
280 /* Print debugging messages. */
281 #if SCTP_DEBUG
282 extern int sctp_debug_flag;
283 #define SCTP_DEBUG_PRINTK(whatever...) \
284 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
285 #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \
286 if (sctp_debug_flag) { \
287 if (saddr->sa.sa_family == AF_INET6) { \
288 printk(KERN_DEBUG \
289 lead "%pI6" trail, \
290 leadparm, \
291 &saddr->v6.sin6_addr, \
292 otherparms); \
293 } else { \
294 printk(KERN_DEBUG \
295 lead "%pI4" trail, \
296 leadparm, \
297 &saddr->v4.sin_addr.s_addr, \
298 otherparms); \
299 } \
300 }
301 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
302 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
303
304 #define SCTP_ASSERT(expr, str, func) \
305 if (!(expr)) { \
306 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
307 str, (#expr), __FILE__, __func__, __LINE__); \
308 func; \
309 }
310
311 #else /* SCTP_DEBUG */
312
313 #define SCTP_DEBUG_PRINTK(whatever...)
314 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
315 #define SCTP_ENABLE_DEBUG
316 #define SCTP_DISABLE_DEBUG
317 #define SCTP_ASSERT(expr, str, func)
318
319 #endif /* SCTP_DEBUG */
320
321
322 /*
323 * Macros for keeping a global reference of object allocations.
324 */
325 #ifdef CONFIG_SCTP_DBG_OBJCNT
326
327 extern atomic_t sctp_dbg_objcnt_sock;
328 extern atomic_t sctp_dbg_objcnt_ep;
329 extern atomic_t sctp_dbg_objcnt_assoc;
330 extern atomic_t sctp_dbg_objcnt_transport;
331 extern atomic_t sctp_dbg_objcnt_chunk;
332 extern atomic_t sctp_dbg_objcnt_bind_addr;
333 extern atomic_t sctp_dbg_objcnt_bind_bucket;
334 extern atomic_t sctp_dbg_objcnt_addr;
335 extern atomic_t sctp_dbg_objcnt_ssnmap;
336 extern atomic_t sctp_dbg_objcnt_datamsg;
337 extern atomic_t sctp_dbg_objcnt_keys;
338
339 /* Macros to atomically increment/decrement objcnt counters. */
340 #define SCTP_DBG_OBJCNT_INC(name) \
341 atomic_inc(&sctp_dbg_objcnt_## name)
342 #define SCTP_DBG_OBJCNT_DEC(name) \
343 atomic_dec(&sctp_dbg_objcnt_## name)
344 #define SCTP_DBG_OBJCNT(name) \
345 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
346
347 /* Macro to help create new entries in in the global array of
348 * objcnt counters.
349 */
350 #define SCTP_DBG_OBJCNT_ENTRY(name) \
351 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
352
353 void sctp_dbg_objcnt_init(void);
354 void sctp_dbg_objcnt_exit(void);
355
356 #else
357
358 #define SCTP_DBG_OBJCNT_INC(name)
359 #define SCTP_DBG_OBJCNT_DEC(name)
360
sctp_dbg_objcnt_init(void)361 static inline void sctp_dbg_objcnt_init(void) { return; }
sctp_dbg_objcnt_exit(void)362 static inline void sctp_dbg_objcnt_exit(void) { return; }
363
364 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
365
366 #if defined CONFIG_SYSCTL
367 void sctp_sysctl_register(void);
368 void sctp_sysctl_unregister(void);
369 #else
sctp_sysctl_register(void)370 static inline void sctp_sysctl_register(void) { return; }
sctp_sysctl_unregister(void)371 static inline void sctp_sysctl_unregister(void) { return; }
372 #endif
373
374 /* Size of Supported Address Parameter for 'x' address types. */
375 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
376
377 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
378
379 void sctp_v6_pf_init(void);
380 void sctp_v6_pf_exit(void);
381 int sctp_v6_protosw_init(void);
382 void sctp_v6_protosw_exit(void);
383 int sctp_v6_add_protocol(void);
384 void sctp_v6_del_protocol(void);
385
386 #else /* #ifdef defined(CONFIG_IPV6) */
387
sctp_v6_pf_init(void)388 static inline void sctp_v6_pf_init(void) { return; }
sctp_v6_pf_exit(void)389 static inline void sctp_v6_pf_exit(void) { return; }
sctp_v6_protosw_init(void)390 static inline int sctp_v6_protosw_init(void) { return 0; }
sctp_v6_protosw_exit(void)391 static inline void sctp_v6_protosw_exit(void) { return; }
sctp_v6_add_protocol(void)392 static inline int sctp_v6_add_protocol(void) { return 0; }
sctp_v6_del_protocol(void)393 static inline void sctp_v6_del_protocol(void) { return; }
394
395 #endif /* #if defined(CONFIG_IPV6) */
396
397
398 /* Map an association to an assoc_id. */
sctp_assoc2id(const struct sctp_association * asoc)399 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
400 {
401 return (asoc?asoc->assoc_id:0);
402 }
403
404 /* Look up the association by its id. */
405 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
406
407
408 /* A macro to walk a list of skbs. */
409 #define sctp_skb_for_each(pos, head, tmp) \
410 skb_queue_walk_safe(head, pos, tmp)
411
412 /* 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)413 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
414 struct sk_buff_head *head)
415 {
416 unsigned long flags;
417
418 sctp_spin_lock_irqsave(&head->lock, flags);
419 sctp_spin_lock(&list->lock);
420
421 skb_queue_splice_tail_init(list, head);
422
423 sctp_spin_unlock(&list->lock);
424 sctp_spin_unlock_irqrestore(&head->lock, flags);
425 }
426
427 /**
428 * sctp_list_dequeue - remove from the head of the queue
429 * @list: list to dequeue from
430 *
431 * Remove the head of the list. The head item is
432 * returned or %NULL if the list is empty.
433 */
434
sctp_list_dequeue(struct list_head * list)435 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
436 {
437 struct list_head *result = NULL;
438
439 if (list->next != list) {
440 result = list->next;
441 list->next = result->next;
442 list->next->prev = list;
443 INIT_LIST_HEAD(result);
444 }
445 return result;
446 }
447
448 /* SCTP version of skb_set_owner_r. We need this one because
449 * of the way we have to do receive buffer accounting on bundled
450 * chunks.
451 */
sctp_skb_set_owner_r(struct sk_buff * skb,struct sock * sk)452 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
453 {
454 struct sctp_ulpevent *event = sctp_skb2event(skb);
455
456 skb->sk = sk;
457 skb->destructor = sctp_sock_rfree;
458 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
459 /*
460 * This mimics the behavior of skb_set_owner_r
461 */
462 sk->sk_forward_alloc -= event->rmem_len;
463 }
464
465 /* Tests if the list has one and only one entry. */
sctp_list_single_entry(struct list_head * head)466 static inline int sctp_list_single_entry(struct list_head *head)
467 {
468 return ((head->next != head) && (head->next == head->prev));
469 }
470
471 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
sctp_jitter(__u32 rto)472 static inline __s32 sctp_jitter(__u32 rto)
473 {
474 static __u32 sctp_rand;
475 __s32 ret;
476
477 /* Avoid divide by zero. */
478 if (!rto)
479 rto = 1;
480
481 sctp_rand += jiffies;
482 sctp_rand ^= (sctp_rand << 12);
483 sctp_rand ^= (sctp_rand >> 20);
484
485 /* Choose random number from 0 to rto, then move to -50% ~ +50%
486 * of rto.
487 */
488 ret = sctp_rand % rto - (rto >> 1);
489 return ret;
490 }
491
492 /* Break down data chunks at this point. */
sctp_frag_point(const struct sctp_sock * sp,int pmtu)493 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu)
494 {
495 int frag = pmtu;
496
497 frag -= sp->pf->af->net_header_len;
498 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
499
500 if (sp->user_frag)
501 frag = min_t(int, frag, sp->user_frag);
502
503 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
504
505 return frag;
506 }
507
sctp_assoc_pending_pmtu(struct sctp_association * asoc)508 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc)
509 {
510
511 sctp_assoc_sync_pmtu(asoc);
512 asoc->pmtu_pending = 0;
513 }
514
515 /* Walk through a list of TLV parameters. Don't trust the
516 * individual parameter lengths and instead depend on
517 * the chunk length to indicate when to stop. Make sure
518 * there is room for a param header too.
519 */
520 #define sctp_walk_params(pos, chunk, member)\
521 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
522
523 #define _sctp_walk_params(pos, chunk, end, member)\
524 for (pos.v = chunk->member;\
525 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\
526 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
527 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
528 pos.v += WORD_ROUND(ntohs(pos.p->length)))
529
530 #define sctp_walk_errors(err, chunk_hdr)\
531 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
532
533 #define _sctp_walk_errors(err, chunk_hdr, end)\
534 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
535 sizeof(sctp_chunkhdr_t));\
536 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\
537 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
538 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
539 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
540
541 #define sctp_walk_fwdtsn(pos, chunk)\
542 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
543
544 #define _sctp_walk_fwdtsn(pos, chunk, end)\
545 for (pos = chunk->subh.fwdtsn_hdr->skip;\
546 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
547 pos++)
548
549 /* Round an int up to the next multiple of 4. */
550 #define WORD_ROUND(s) (((s)+3)&~3)
551
552 /* Make a new instance of type. */
553 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags)
554
555 /* Compare two timevals. */
556 #define tv_lt(s, t) \
557 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
558
559 /* Add tv1 to tv2. */
560 #define TIMEVAL_ADD(tv1, tv2) \
561 ({ \
562 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
563 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
564 \
565 if (usecs >= 1000000) { \
566 usecs -= 1000000; \
567 secs++; \
568 } \
569 (tv2).tv_sec = secs; \
570 (tv2).tv_usec = usecs; \
571 })
572
573 /* External references. */
574
575 extern struct proto sctp_prot;
576 extern struct proto sctpv6_prot;
577 extern struct proc_dir_entry *proc_net_sctp;
578 void sctp_put_port(struct sock *sk);
579
580 extern struct idr sctp_assocs_id;
581 extern spinlock_t sctp_assocs_id_lock;
582
583 /* Static inline functions. */
584
585 /* Convert from an IP version number to an Address Family symbol. */
ipver2af(__u8 ipver)586 static inline int ipver2af(__u8 ipver)
587 {
588 switch (ipver) {
589 case 4:
590 return AF_INET;
591 case 6:
592 return AF_INET6;
593 default:
594 return 0;
595 };
596 }
597
598 /* Convert from an address parameter type to an address family. */
param_type2af(__be16 type)599 static inline int param_type2af(__be16 type)
600 {
601 switch (type) {
602 case SCTP_PARAM_IPV4_ADDRESS:
603 return AF_INET;
604 case SCTP_PARAM_IPV6_ADDRESS:
605 return AF_INET6;
606 default:
607 return 0;
608 };
609 }
610
611 /* Perform some sanity checks. */
sctp_sanity_check(void)612 static inline int sctp_sanity_check(void)
613 {
614 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
615 sizeof(((struct sk_buff *)0)->cb),
616 "SCTP: ulpevent does not fit in skb!\n", return 0);
617
618 return 1;
619 }
620
621 /* Warning: The following hash functions assume a power of two 'size'. */
622 /* This is the hash function for the SCTP port hash table. */
sctp_phashfn(__u16 lport)623 static inline int sctp_phashfn(__u16 lport)
624 {
625 return (lport & (sctp_port_hashsize - 1));
626 }
627
628 /* This is the hash function for the endpoint hash table. */
sctp_ep_hashfn(__u16 lport)629 static inline int sctp_ep_hashfn(__u16 lport)
630 {
631 return (lport & (sctp_ep_hashsize - 1));
632 }
633
634 /* This is the hash function for the association hash table. */
sctp_assoc_hashfn(__u16 lport,__u16 rport)635 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
636 {
637 int h = (lport << 16) + rport;
638 h ^= h>>8;
639 return (h & (sctp_assoc_hashsize - 1));
640 }
641
642 /* This is the hash function for the association hash table. This is
643 * not used yet, but could be used as a better hash function when
644 * we have a vtag.
645 */
sctp_vtag_hashfn(__u16 lport,__u16 rport,__u32 vtag)646 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
647 {
648 int h = (lport << 16) + rport;
649 h ^= vtag;
650 return (h & (sctp_assoc_hashsize-1));
651 }
652
653 #define sctp_for_each_hentry(epb, node, head) \
654 hlist_for_each_entry(epb, node, head, node)
655
656 /* Is a socket of this style? */
657 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
__sctp_style(const struct sock * sk,sctp_socket_type_t style)658 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
659 {
660 return sctp_sk(sk)->type == style;
661 }
662
663 /* Is the association in this state? */
664 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
__sctp_state(const struct sctp_association * asoc,sctp_state_t state)665 static inline int __sctp_state(const struct sctp_association *asoc,
666 sctp_state_t state)
667 {
668 return asoc->state == state;
669 }
670
671 /* Is the socket in this state? */
672 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
__sctp_sstate(const struct sock * sk,sctp_sock_state_t state)673 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
674 {
675 return sk->sk_state == state;
676 }
677
678 /* Map v4-mapped v6 address back to v4 address */
sctp_v6_map_v4(union sctp_addr * addr)679 static inline void sctp_v6_map_v4(union sctp_addr *addr)
680 {
681 addr->v4.sin_family = AF_INET;
682 addr->v4.sin_port = addr->v6.sin6_port;
683 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
684 }
685
686 /* Map v4 address to v4-mapped v6 address */
sctp_v4_map_v6(union sctp_addr * addr)687 static inline void sctp_v4_map_v6(union sctp_addr *addr)
688 {
689 addr->v6.sin6_family = AF_INET6;
690 addr->v6.sin6_port = addr->v4.sin_port;
691 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
692 addr->v6.sin6_addr.s6_addr32[0] = 0;
693 addr->v6.sin6_addr.s6_addr32[1] = 0;
694 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
695 }
696
697 #endif /* __net_sctp_h__ */
698