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 #include <linux/types.h>
66 #include <linux/slab.h>
67 #include <linux/in.h>
68 #include <linux/tty.h>
69 #include <linux/proc_fs.h>
70 #include <linux/spinlock.h>
71 #include <linux/jiffies.h>
72 #include <linux/idr.h>
73
74 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
75 #include <net/ipv6.h>
76 #include <net/ip6_route.h>
77 #endif
78
79 #include <asm/uaccess.h>
80 #include <asm/page.h>
81 #include <net/sock.h>
82 #include <net/snmp.h>
83 #include <net/sctp/structs.h>
84 #include <net/sctp/constants.h>
85
86
87 /* Set SCTP_DEBUG flag via config if not already set. */
88 #ifndef SCTP_DEBUG
89 #ifdef CONFIG_SCTP_DBG_MSG
90 #define SCTP_DEBUG 1
91 #else
92 #define SCTP_DEBUG 0
93 #endif /* CONFIG_SCTP_DBG */
94 #endif /* SCTP_DEBUG */
95
96 #ifdef CONFIG_IP_SCTP_MODULE
97 #define SCTP_PROTOSW_FLAG 0
98 #else /* static! */
99 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
100 #endif
101
102
103 /* Certain internal static functions need to be exported when
104 * compiled into the test frame.
105 */
106 #ifndef SCTP_STATIC
107 #define SCTP_STATIC static
108 #endif
109
110 /*
111 * Function declarations.
112 */
113
114 /*
115 * sctp/protocol.c
116 */
117 extern struct sock *sctp_get_ctl_sock(void);
118 extern void sctp_local_addr_free(struct rcu_head *head);
119 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
120 sctp_scope_t, gfp_t gfp,
121 int flags);
122 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
123 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
124
125 /*
126 * sctp/socket.c
127 */
128 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
129 int sctp_inet_listen(struct socket *sock, int backlog);
130 void sctp_write_space(struct sock *sk);
131 void sctp_data_ready(struct sock *sk, int len);
132 unsigned int sctp_poll(struct file *file, struct socket *sock,
133 poll_table *wait);
134 void sctp_sock_rfree(struct sk_buff *skb);
135 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
136 struct sctp_association *asoc);
137 extern struct percpu_counter sctp_sockets_allocated;
138
139 /*
140 * sctp/primitive.c
141 */
142 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
143 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
144 int sctp_primitive_ABORT(struct sctp_association *, void *arg);
145 int sctp_primitive_SEND(struct sctp_association *, void *arg);
146 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
147 int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
148
149 /*
150 * sctp/input.c
151 */
152 int sctp_rcv(struct sk_buff *skb);
153 void sctp_v4_err(struct sk_buff *skb, u32 info);
154 void sctp_hash_established(struct sctp_association *);
155 void sctp_unhash_established(struct sctp_association *);
156 void sctp_hash_endpoint(struct sctp_endpoint *);
157 void sctp_unhash_endpoint(struct sctp_endpoint *);
158 struct sock *sctp_err_lookup(int family, struct sk_buff *,
159 struct sctphdr *, struct sctp_association **,
160 struct sctp_transport **);
161 void sctp_err_finish(struct sock *, struct sctp_association *);
162 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
163 struct sctp_transport *t, __u32 pmtu);
164 void sctp_icmp_proto_unreachable(struct sock *sk,
165 struct sctp_association *asoc,
166 struct sctp_transport *t);
167 void sctp_backlog_migrate(struct sctp_association *assoc,
168 struct sock *oldsk, struct sock *newsk);
169
170 /*
171 * sctp/proc.c
172 */
173 int sctp_snmp_proc_init(void);
174 void sctp_snmp_proc_exit(void);
175 int sctp_eps_proc_init(void);
176 void sctp_eps_proc_exit(void);
177 int sctp_assocs_proc_init(void);
178 void sctp_assocs_proc_exit(void);
179 int sctp_remaddr_proc_init(void);
180 void sctp_remaddr_proc_exit(void);
181
182
183 /*
184 * Module global variables
185 */
186
187 /*
188 * sctp/protocol.c
189 */
190 extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
191 extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
192
193 /*
194 * Section: Macros, externs, and inlines
195 */
196
197
198 #ifdef TEST_FRAME
199 #include <test_frame.h>
200 #else
201
202 /* spin lock wrappers. */
203 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
204 #define sctp_spin_unlock_irqrestore(lock, flags) \
205 spin_unlock_irqrestore(lock, flags)
206 #define sctp_local_bh_disable() local_bh_disable()
207 #define sctp_local_bh_enable() local_bh_enable()
208 #define sctp_spin_lock(lock) spin_lock(lock)
209 #define sctp_spin_unlock(lock) spin_unlock(lock)
210 #define sctp_write_lock(lock) write_lock(lock)
211 #define sctp_write_unlock(lock) write_unlock(lock)
212 #define sctp_read_lock(lock) read_lock(lock)
213 #define sctp_read_unlock(lock) read_unlock(lock)
214
215 /* sock lock wrappers. */
216 #define sctp_lock_sock(sk) lock_sock(sk)
217 #define sctp_release_sock(sk) release_sock(sk)
218 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
219 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
220
221 /* SCTP SNMP MIB stats handlers */
222 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
223 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field)
224 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field)
225 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
226 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field)
227
228 #endif /* !TEST_FRAME */
229
230 /* sctp mib definitions */
231 enum {
232 SCTP_MIB_NUM = 0,
233 SCTP_MIB_CURRESTAB, /* CurrEstab */
234 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
235 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
236 SCTP_MIB_ABORTEDS, /* Aborteds */
237 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
238 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
239 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
240 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
241 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
242 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
243 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
244 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
245 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
246 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
247 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
248 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
249 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
250 SCTP_MIB_T1_INIT_EXPIREDS,
251 SCTP_MIB_T1_COOKIE_EXPIREDS,
252 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
253 SCTP_MIB_T3_RTX_EXPIREDS,
254 SCTP_MIB_T4_RTO_EXPIREDS,
255 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
256 SCTP_MIB_DELAY_SACK_EXPIREDS,
257 SCTP_MIB_AUTOCLOSE_EXPIREDS,
258 SCTP_MIB_T1_RETRANSMITS,
259 SCTP_MIB_T3_RETRANSMITS,
260 SCTP_MIB_PMTUD_RETRANSMITS,
261 SCTP_MIB_FAST_RETRANSMITS,
262 SCTP_MIB_IN_PKT_SOFTIRQ,
263 SCTP_MIB_IN_PKT_BACKLOG,
264 SCTP_MIB_IN_PKT_DISCARDS,
265 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
266 __SCTP_MIB_MAX
267 };
268
269 #define SCTP_MIB_MAX __SCTP_MIB_MAX
270 struct sctp_mib {
271 unsigned long mibs[SCTP_MIB_MAX];
272 };
273
274
275 /* Print debugging messages. */
276 #if SCTP_DEBUG
277 extern int sctp_debug_flag;
278 #define SCTP_DEBUG_PRINTK(fmt, args...) \
279 do { \
280 if (sctp_debug_flag) \
281 printk(KERN_DEBUG pr_fmt(fmt), ##args); \
282 } while (0)
283 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \
284 do { \
285 if (sctp_debug_flag) \
286 pr_cont(fmt, ##args); \
287 } while (0)
288 #define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \
289 args_lead, saddr, args_trail...) \
290 do { \
291 if (sctp_debug_flag) { \
292 if (saddr->sa.sa_family == AF_INET6) { \
293 printk(KERN_DEBUG \
294 pr_fmt(fmt_lead "%pI6" fmt_trail), \
295 args_lead, \
296 &saddr->v6.sin6_addr, \
297 args_trail); \
298 } else { \
299 printk(KERN_DEBUG \
300 pr_fmt(fmt_lead "%pI4" fmt_trail), \
301 args_lead, \
302 &saddr->v4.sin_addr.s_addr, \
303 args_trail); \
304 } \
305 } \
306 } while (0)
307 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
308 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
309
310 #define SCTP_ASSERT(expr, str, func) \
311 if (!(expr)) { \
312 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
313 str, (#expr), __FILE__, __func__, __LINE__); \
314 func; \
315 }
316
317 #else /* SCTP_DEBUG */
318
319 #define SCTP_DEBUG_PRINTK(whatever...)
320 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
321 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
322 #define SCTP_ENABLE_DEBUG
323 #define SCTP_DISABLE_DEBUG
324 #define SCTP_ASSERT(expr, str, func)
325
326 #endif /* SCTP_DEBUG */
327
328
329 /*
330 * Macros for keeping a global reference of object allocations.
331 */
332 #ifdef CONFIG_SCTP_DBG_OBJCNT
333
334 extern atomic_t sctp_dbg_objcnt_sock;
335 extern atomic_t sctp_dbg_objcnt_ep;
336 extern atomic_t sctp_dbg_objcnt_assoc;
337 extern atomic_t sctp_dbg_objcnt_transport;
338 extern atomic_t sctp_dbg_objcnt_chunk;
339 extern atomic_t sctp_dbg_objcnt_bind_addr;
340 extern atomic_t sctp_dbg_objcnt_bind_bucket;
341 extern atomic_t sctp_dbg_objcnt_addr;
342 extern atomic_t sctp_dbg_objcnt_ssnmap;
343 extern atomic_t sctp_dbg_objcnt_datamsg;
344 extern atomic_t sctp_dbg_objcnt_keys;
345
346 /* Macros to atomically increment/decrement objcnt counters. */
347 #define SCTP_DBG_OBJCNT_INC(name) \
348 atomic_inc(&sctp_dbg_objcnt_## name)
349 #define SCTP_DBG_OBJCNT_DEC(name) \
350 atomic_dec(&sctp_dbg_objcnt_## name)
351 #define SCTP_DBG_OBJCNT(name) \
352 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
353
354 /* Macro to help create new entries in in the global array of
355 * objcnt counters.
356 */
357 #define SCTP_DBG_OBJCNT_ENTRY(name) \
358 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
359
360 void sctp_dbg_objcnt_init(void);
361 void sctp_dbg_objcnt_exit(void);
362
363 #else
364
365 #define SCTP_DBG_OBJCNT_INC(name)
366 #define SCTP_DBG_OBJCNT_DEC(name)
367
sctp_dbg_objcnt_init(void)368 static inline void sctp_dbg_objcnt_init(void) { return; }
sctp_dbg_objcnt_exit(void)369 static inline void sctp_dbg_objcnt_exit(void) { return; }
370
371 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
372
373 #if defined CONFIG_SYSCTL
374 void sctp_sysctl_register(void);
375 void sctp_sysctl_unregister(void);
376 #else
sctp_sysctl_register(void)377 static inline void sctp_sysctl_register(void) { return; }
sctp_sysctl_unregister(void)378 static inline void sctp_sysctl_unregister(void) { return; }
379 #endif
380
381 /* Size of Supported Address Parameter for 'x' address types. */
382 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
383
384 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
385
386 void sctp_v6_pf_init(void);
387 void sctp_v6_pf_exit(void);
388 int sctp_v6_protosw_init(void);
389 void sctp_v6_protosw_exit(void);
390 int sctp_v6_add_protocol(void);
391 void sctp_v6_del_protocol(void);
392
393 #else /* #ifdef defined(CONFIG_IPV6) */
394
sctp_v6_pf_init(void)395 static inline void sctp_v6_pf_init(void) { return; }
sctp_v6_pf_exit(void)396 static inline void sctp_v6_pf_exit(void) { return; }
sctp_v6_protosw_init(void)397 static inline int sctp_v6_protosw_init(void) { return 0; }
sctp_v6_protosw_exit(void)398 static inline void sctp_v6_protosw_exit(void) { return; }
sctp_v6_add_protocol(void)399 static inline int sctp_v6_add_protocol(void) { return 0; }
sctp_v6_del_protocol(void)400 static inline void sctp_v6_del_protocol(void) { return; }
401
402 #endif /* #if defined(CONFIG_IPV6) */
403
404
405 /* Map an association to an assoc_id. */
sctp_assoc2id(const struct sctp_association * asoc)406 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
407 {
408 return asoc ? asoc->assoc_id : 0;
409 }
410
411 /* Look up the association by its id. */
412 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
413
414
415 /* A macro to walk a list of skbs. */
416 #define sctp_skb_for_each(pos, head, tmp) \
417 skb_queue_walk_safe(head, pos, tmp)
418
419 /* 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)420 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
421 struct sk_buff_head *head)
422 {
423 unsigned long flags;
424
425 sctp_spin_lock_irqsave(&head->lock, flags);
426 sctp_spin_lock(&list->lock);
427
428 skb_queue_splice_tail_init(list, head);
429
430 sctp_spin_unlock(&list->lock);
431 sctp_spin_unlock_irqrestore(&head->lock, flags);
432 }
433
434 /**
435 * sctp_list_dequeue - remove from the head of the queue
436 * @list: list to dequeue from
437 *
438 * Remove the head of the list. The head item is
439 * returned or %NULL if the list is empty.
440 */
441
sctp_list_dequeue(struct list_head * list)442 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
443 {
444 struct list_head *result = NULL;
445
446 if (list->next != list) {
447 result = list->next;
448 list->next = result->next;
449 list->next->prev = list;
450 INIT_LIST_HEAD(result);
451 }
452 return result;
453 }
454
455 /* SCTP version of skb_set_owner_r. We need this one because
456 * of the way we have to do receive buffer accounting on bundled
457 * chunks.
458 */
sctp_skb_set_owner_r(struct sk_buff * skb,struct sock * sk)459 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
460 {
461 struct sctp_ulpevent *event = sctp_skb2event(skb);
462
463 skb_orphan(skb);
464 skb->sk = sk;
465 skb->destructor = sctp_sock_rfree;
466 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
467 /*
468 * This mimics the behavior of skb_set_owner_r
469 */
470 sk->sk_forward_alloc -= event->rmem_len;
471 }
472
473 /* Tests if the list has one and only one entry. */
sctp_list_single_entry(struct list_head * head)474 static inline int sctp_list_single_entry(struct list_head *head)
475 {
476 return (head->next != head) && (head->next == head->prev);
477 }
478
479 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
sctp_jitter(__u32 rto)480 static inline __s32 sctp_jitter(__u32 rto)
481 {
482 static __u32 sctp_rand;
483 __s32 ret;
484
485 /* Avoid divide by zero. */
486 if (!rto)
487 rto = 1;
488
489 sctp_rand += jiffies;
490 sctp_rand ^= (sctp_rand << 12);
491 sctp_rand ^= (sctp_rand >> 20);
492
493 /* Choose random number from 0 to rto, then move to -50% ~ +50%
494 * of rto.
495 */
496 ret = sctp_rand % rto - (rto >> 1);
497 return ret;
498 }
499
500 /* Break down data chunks at this point. */
sctp_frag_point(const struct sctp_association * asoc,int pmtu)501 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
502 {
503 struct sctp_sock *sp = sctp_sk(asoc->base.sk);
504 int frag = pmtu;
505
506 frag -= sp->pf->af->net_header_len;
507 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
508
509 if (asoc->user_frag)
510 frag = min_t(int, frag, asoc->user_frag);
511
512 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
513
514 return frag;
515 }
516
sctp_assoc_pending_pmtu(struct sctp_association * asoc)517 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc)
518 {
519
520 sctp_assoc_sync_pmtu(asoc);
521 asoc->pmtu_pending = 0;
522 }
523
524 /* Walk through a list of TLV parameters. Don't trust the
525 * individual parameter lengths and instead depend on
526 * the chunk length to indicate when to stop. Make sure
527 * there is room for a param header too.
528 */
529 #define sctp_walk_params(pos, chunk, member)\
530 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
531
532 #define _sctp_walk_params(pos, chunk, end, member)\
533 for (pos.v = chunk->member;\
534 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\
535 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
536 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
537 pos.v += WORD_ROUND(ntohs(pos.p->length)))
538
539 #define sctp_walk_errors(err, chunk_hdr)\
540 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
541
542 #define _sctp_walk_errors(err, chunk_hdr, end)\
543 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
544 sizeof(sctp_chunkhdr_t));\
545 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\
546 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
547 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
548 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
549
550 #define sctp_walk_fwdtsn(pos, chunk)\
551 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
552
553 #define _sctp_walk_fwdtsn(pos, chunk, end)\
554 for (pos = chunk->subh.fwdtsn_hdr->skip;\
555 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
556 pos++)
557
558 /* Round an int up to the next multiple of 4. */
559 #define WORD_ROUND(s) (((s)+3)&~3)
560
561 /* Make a new instance of type. */
562 #define t_new(type, flags) (type *)kzalloc(sizeof(type), flags)
563
564 /* Compare two timevals. */
565 #define tv_lt(s, t) \
566 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
567
568 /* Add tv1 to tv2. */
569 #define TIMEVAL_ADD(tv1, tv2) \
570 ({ \
571 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
572 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
573 \
574 if (usecs >= 1000000) { \
575 usecs -= 1000000; \
576 secs++; \
577 } \
578 (tv2).tv_sec = secs; \
579 (tv2).tv_usec = usecs; \
580 })
581
582 /* External references. */
583
584 extern struct proto sctp_prot;
585 extern struct proto sctpv6_prot;
586 extern struct proc_dir_entry *proc_net_sctp;
587 void sctp_put_port(struct sock *sk);
588
589 extern struct idr sctp_assocs_id;
590 extern spinlock_t sctp_assocs_id_lock;
591
592 /* Static inline functions. */
593
594 /* Convert from an IP version number to an Address Family symbol. */
ipver2af(__u8 ipver)595 static inline int ipver2af(__u8 ipver)
596 {
597 switch (ipver) {
598 case 4:
599 return AF_INET;
600 case 6:
601 return AF_INET6;
602 default:
603 return 0;
604 };
605 }
606
607 /* Convert from an address parameter type to an address family. */
param_type2af(__be16 type)608 static inline int param_type2af(__be16 type)
609 {
610 switch (type) {
611 case SCTP_PARAM_IPV4_ADDRESS:
612 return AF_INET;
613 case SCTP_PARAM_IPV6_ADDRESS:
614 return AF_INET6;
615 default:
616 return 0;
617 };
618 }
619
620 /* Perform some sanity checks. */
sctp_sanity_check(void)621 static inline int sctp_sanity_check(void)
622 {
623 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
624 sizeof(((struct sk_buff *)0)->cb),
625 "SCTP: ulpevent does not fit in skb!\n", return 0);
626
627 return 1;
628 }
629
630 /* Warning: The following hash functions assume a power of two 'size'. */
631 /* This is the hash function for the SCTP port hash table. */
sctp_phashfn(__u16 lport)632 static inline int sctp_phashfn(__u16 lport)
633 {
634 return lport & (sctp_port_hashsize - 1);
635 }
636
637 /* This is the hash function for the endpoint hash table. */
sctp_ep_hashfn(__u16 lport)638 static inline int sctp_ep_hashfn(__u16 lport)
639 {
640 return lport & (sctp_ep_hashsize - 1);
641 }
642
643 /* This is the hash function for the association hash table. */
sctp_assoc_hashfn(__u16 lport,__u16 rport)644 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
645 {
646 int h = (lport << 16) + rport;
647 h ^= h>>8;
648 return h & (sctp_assoc_hashsize - 1);
649 }
650
651 /* This is the hash function for the association hash table. This is
652 * not used yet, but could be used as a better hash function when
653 * we have a vtag.
654 */
sctp_vtag_hashfn(__u16 lport,__u16 rport,__u32 vtag)655 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
656 {
657 int h = (lport << 16) + rport;
658 h ^= vtag;
659 return h & (sctp_assoc_hashsize - 1);
660 }
661
662 #define sctp_for_each_hentry(epb, node, head) \
663 hlist_for_each_entry(epb, node, head, node)
664
665 /* Is a socket of this style? */
666 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
__sctp_style(const struct sock * sk,sctp_socket_type_t style)667 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
668 {
669 return sctp_sk(sk)->type == style;
670 }
671
672 /* Is the association in this state? */
673 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
__sctp_state(const struct sctp_association * asoc,sctp_state_t state)674 static inline int __sctp_state(const struct sctp_association *asoc,
675 sctp_state_t state)
676 {
677 return asoc->state == state;
678 }
679
680 /* Is the socket in this state? */
681 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
__sctp_sstate(const struct sock * sk,sctp_sock_state_t state)682 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
683 {
684 return sk->sk_state == state;
685 }
686
687 /* Map v4-mapped v6 address back to v4 address */
sctp_v6_map_v4(union sctp_addr * addr)688 static inline void sctp_v6_map_v4(union sctp_addr *addr)
689 {
690 addr->v4.sin_family = AF_INET;
691 addr->v4.sin_port = addr->v6.sin6_port;
692 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
693 }
694
695 /* Map v4 address to v4-mapped v6 address */
sctp_v4_map_v6(union sctp_addr * addr)696 static inline void sctp_v4_map_v6(union sctp_addr *addr)
697 {
698 addr->v6.sin6_family = AF_INET6;
699 addr->v6.sin6_port = addr->v4.sin_port;
700 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
701 addr->v6.sin6_addr.s6_addr32[0] = 0;
702 addr->v6.sin6_addr.s6_addr32[1] = 0;
703 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
704 }
705
706 #endif /* __net_sctp_h__ */
707