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1da177e4 LT |
1 | /* SCTP kernel reference 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 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 | ||
1da177e4 LT |
66 | |
67 | #ifdef TEST_FRAME | |
68 | #undef CONFIG_PROC_FS | |
69 | #undef CONFIG_SCTP_DBG_OBJCNT | |
70 | #undef CONFIG_SYSCTL | |
71 | #endif /* TEST_FRAME */ | |
72 | ||
73 | #include <linux/types.h> | |
74 | #include <linux/slab.h> | |
75 | #include <linux/in.h> | |
76 | #include <linux/tty.h> | |
77 | #include <linux/proc_fs.h> | |
78 | #include <linux/spinlock.h> | |
79 | #include <linux/jiffies.h> | |
80 | #include <linux/idr.h> | |
81 | ||
82 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
83 | #include <net/ipv6.h> | |
84 | #include <net/ip6_route.h> | |
85 | #endif | |
86 | ||
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 | /* | |
119 | * Function declarations. | |
120 | */ | |
121 | ||
122 | /* | |
123 | * sctp/protocol.c | |
124 | */ | |
125 | extern struct sock *sctp_get_ctl_sock(void); | |
126 | extern int sctp_copy_local_addr_list(struct sctp_bind_addr *, | |
dd0fc66f | 127 | sctp_scope_t, gfp_t gfp, |
3182cd84 | 128 | int flags); |
1da177e4 LT |
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); | |
16164366 AB |
131 | int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
132 | void *ptr); | |
1da177e4 LT |
133 | |
134 | /* | |
135 | * sctp/socket.c | |
136 | */ | |
137 | int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); | |
138 | int sctp_inet_listen(struct socket *sock, int backlog); | |
139 | void sctp_write_space(struct sock *sk); | |
140 | unsigned int sctp_poll(struct file *file, struct socket *sock, | |
141 | poll_table *wait); | |
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/crc32c.c | |
155 | */ | |
156 | __u32 sctp_start_cksum(__u8 *ptr, __u16 count); | |
157 | __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum); | |
158 | __u32 sctp_end_cksum(__u32 cksum); | |
159 | __u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum); | |
160 | ||
161 | /* | |
162 | * sctp/input.c | |
163 | */ | |
164 | int sctp_rcv(struct sk_buff *skb); | |
165 | void sctp_v4_err(struct sk_buff *skb, u32 info); | |
166 | void sctp_hash_established(struct sctp_association *); | |
167 | void sctp_unhash_established(struct sctp_association *); | |
168 | void sctp_hash_endpoint(struct sctp_endpoint *); | |
169 | void sctp_unhash_endpoint(struct sctp_endpoint *); | |
170 | struct sock *sctp_err_lookup(int family, struct sk_buff *, | |
d1ad1ff2 | 171 | struct sctphdr *, struct sctp_association **, |
1da177e4 | 172 | struct sctp_transport **); |
d1ad1ff2 | 173 | void sctp_err_finish(struct sock *, struct sctp_association *); |
1da177e4 LT |
174 | void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, |
175 | struct sctp_transport *t, __u32 pmtu); | |
176 | void sctp_icmp_proto_unreachable(struct sock *sk, | |
1da177e4 LT |
177 | struct sctp_association *asoc, |
178 | struct sctp_transport *t); | |
c4d2444e SS |
179 | void sctp_backlog_migrate(struct sctp_association *assoc, |
180 | struct sock *oldsk, struct sock *newsk); | |
1da177e4 | 181 | |
16164366 AB |
182 | /* |
183 | * sctp/proc.c | |
184 | */ | |
185 | int sctp_snmp_proc_init(void); | |
186 | void sctp_snmp_proc_exit(void); | |
187 | int sctp_eps_proc_init(void); | |
188 | void sctp_eps_proc_exit(void); | |
189 | int sctp_assocs_proc_init(void); | |
190 | void sctp_assocs_proc_exit(void); | |
191 | ||
192 | ||
1da177e4 LT |
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 | #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) | |
221 | #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) | |
222 | ||
223 | /* SCTP SNMP MIB stats handlers */ | |
224 | DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); | |
225 | #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) | |
226 | #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) | |
227 | #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) | |
228 | #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) | |
229 | ||
230 | #endif /* !TEST_FRAME */ | |
231 | ||
ac0b0462 SS |
232 | /* sctp mib definitions */ |
233 | enum | |
234 | { | |
235 | SCTP_MIB_NUM = 0, | |
236 | SCTP_MIB_CURRESTAB, /* CurrEstab */ | |
237 | SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ | |
238 | SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ | |
239 | SCTP_MIB_ABORTEDS, /* Aborteds */ | |
240 | SCTP_MIB_SHUTDOWNS, /* Shutdowns */ | |
241 | SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ | |
242 | SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ | |
243 | SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ | |
244 | SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ | |
245 | SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ | |
246 | SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ | |
247 | SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ | |
248 | SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ | |
249 | SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ | |
250 | SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ | |
251 | SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ | |
252 | SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ | |
253 | SCTP_MIB_T1_INIT_EXPIREDS, | |
254 | SCTP_MIB_T1_COOKIE_EXPIREDS, | |
255 | SCTP_MIB_T2_SHUTDOWN_EXPIREDS, | |
256 | SCTP_MIB_T3_RTX_EXPIREDS, | |
257 | SCTP_MIB_T4_RTO_EXPIREDS, | |
258 | SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, | |
259 | SCTP_MIB_DELAY_SACK_EXPIREDS, | |
260 | SCTP_MIB_AUTOCLOSE_EXPIREDS, | |
261 | SCTP_MIB_T3_RETRANSMITS, | |
262 | SCTP_MIB_PMTUD_RETRANSMITS, | |
263 | SCTP_MIB_FAST_RETRANSMITS, | |
264 | SCTP_MIB_IN_PKT_SOFTIRQ, | |
265 | SCTP_MIB_IN_PKT_BACKLOG, | |
266 | SCTP_MIB_IN_PKT_DISCARDS, | |
267 | SCTP_MIB_IN_DATA_CHUNK_DISCARDS, | |
268 | __SCTP_MIB_MAX | |
269 | }; | |
270 | ||
271 | #define SCTP_MIB_MAX __SCTP_MIB_MAX | |
272 | struct sctp_mib { | |
273 | unsigned long mibs[SCTP_MIB_MAX]; | |
274 | } __SNMP_MIB_ALIGN__; | |
275 | ||
1da177e4 LT |
276 | |
277 | /* Print debugging messages. */ | |
278 | #if SCTP_DEBUG | |
279 | extern int sctp_debug_flag; | |
280 | #define SCTP_DEBUG_PRINTK(whatever...) \ | |
281 | ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) | |
3f7a87d2 FF |
282 | #define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \ |
283 | if (sctp_debug_flag) { \ | |
284 | if (saddr->sa.sa_family == AF_INET6) { \ | |
285 | printk(KERN_DEBUG \ | |
46b86a2d | 286 | lead NIP6_FMT trail, \ |
3f7a87d2 FF |
287 | leadparm, \ |
288 | NIP6(saddr->v6.sin6_addr), \ | |
289 | otherparms); \ | |
290 | } else { \ | |
291 | printk(KERN_DEBUG \ | |
46b86a2d | 292 | lead NIPQUAD_FMT trail, \ |
3f7a87d2 FF |
293 | leadparm, \ |
294 | NIPQUAD(saddr->v4.sin_addr.s_addr), \ | |
295 | otherparms); \ | |
296 | } \ | |
297 | } | |
1da177e4 LT |
298 | #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } |
299 | #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } | |
300 | ||
301 | #define SCTP_ASSERT(expr, str, func) \ | |
302 | if (!(expr)) { \ | |
303 | SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ | |
304 | str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ | |
305 | func; \ | |
306 | } | |
307 | ||
308 | #else /* SCTP_DEBUG */ | |
309 | ||
310 | #define SCTP_DEBUG_PRINTK(whatever...) | |
3f7a87d2 | 311 | #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) |
1da177e4 LT |
312 | #define SCTP_ENABLE_DEBUG |
313 | #define SCTP_DISABLE_DEBUG | |
65fd28f7 | 314 | #define SCTP_ASSERT(expr, str, func) |
1da177e4 LT |
315 | |
316 | #endif /* SCTP_DEBUG */ | |
317 | ||
318 | ||
319 | /* | |
320 | * Macros for keeping a global reference of object allocations. | |
321 | */ | |
322 | #ifdef CONFIG_SCTP_DBG_OBJCNT | |
323 | ||
324 | extern atomic_t sctp_dbg_objcnt_sock; | |
325 | extern atomic_t sctp_dbg_objcnt_ep; | |
326 | extern atomic_t sctp_dbg_objcnt_assoc; | |
327 | extern atomic_t sctp_dbg_objcnt_transport; | |
328 | extern atomic_t sctp_dbg_objcnt_chunk; | |
329 | extern atomic_t sctp_dbg_objcnt_bind_addr; | |
330 | extern atomic_t sctp_dbg_objcnt_bind_bucket; | |
331 | extern atomic_t sctp_dbg_objcnt_addr; | |
332 | extern atomic_t sctp_dbg_objcnt_ssnmap; | |
333 | extern atomic_t sctp_dbg_objcnt_datamsg; | |
334 | ||
335 | /* Macros to atomically increment/decrement objcnt counters. */ | |
336 | #define SCTP_DBG_OBJCNT_INC(name) \ | |
337 | atomic_inc(&sctp_dbg_objcnt_## name) | |
338 | #define SCTP_DBG_OBJCNT_DEC(name) \ | |
339 | atomic_dec(&sctp_dbg_objcnt_## name) | |
340 | #define SCTP_DBG_OBJCNT(name) \ | |
341 | atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) | |
342 | ||
343 | /* Macro to help create new entries in in the global array of | |
344 | * objcnt counters. | |
345 | */ | |
346 | #define SCTP_DBG_OBJCNT_ENTRY(name) \ | |
347 | {.label= #name, .counter= &sctp_dbg_objcnt_## name} | |
348 | ||
349 | void sctp_dbg_objcnt_init(void); | |
350 | void sctp_dbg_objcnt_exit(void); | |
351 | ||
352 | #else | |
353 | ||
354 | #define SCTP_DBG_OBJCNT_INC(name) | |
355 | #define SCTP_DBG_OBJCNT_DEC(name) | |
356 | ||
357 | static inline void sctp_dbg_objcnt_init(void) { return; } | |
358 | static inline void sctp_dbg_objcnt_exit(void) { return; } | |
359 | ||
360 | #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ | |
361 | ||
362 | #if defined CONFIG_SYSCTL | |
363 | void sctp_sysctl_register(void); | |
364 | void sctp_sysctl_unregister(void); | |
365 | #else | |
366 | static inline void sctp_sysctl_register(void) { return; } | |
367 | static inline void sctp_sysctl_unregister(void) { return; } | |
368 | static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen, | |
369 | void __user *oldval, size_t __user *oldlenp, | |
370 | void __user *newval, size_t newlen, void **context) { | |
371 | return -ENOSYS; | |
372 | } | |
373 | #endif | |
374 | ||
375 | /* Size of Supported Address Parameter for 'x' address types. */ | |
376 | #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) | |
377 | ||
378 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
379 | ||
380 | int sctp_v6_init(void); | |
381 | void sctp_v6_exit(void); | |
382 | ||
383 | #else /* #ifdef defined(CONFIG_IPV6) */ | |
384 | ||
385 | static inline int sctp_v6_init(void) { return 0; } | |
386 | static inline void sctp_v6_exit(void) { return; } | |
387 | ||
388 | #endif /* #if defined(CONFIG_IPV6) */ | |
389 | ||
1da177e4 LT |
390 | |
391 | /* Map an association to an assoc_id. */ | |
392 | static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) | |
393 | { | |
394 | return (asoc?asoc->assoc_id:0); | |
395 | } | |
396 | ||
397 | /* Look up the association by its id. */ | |
398 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); | |
399 | ||
400 | ||
401 | /* A macro to walk a list of skbs. */ | |
402 | #define sctp_skb_for_each(pos, head, tmp) \ | |
403 | for (pos = (head)->next;\ | |
404 | tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ | |
405 | pos = tmp) | |
406 | ||
407 | ||
408 | /* A helper to append an entire skb list (list) to another (head). */ | |
409 | static inline void sctp_skb_list_tail(struct sk_buff_head *list, | |
410 | struct sk_buff_head *head) | |
411 | { | |
412 | unsigned long flags; | |
413 | ||
414 | sctp_spin_lock_irqsave(&head->lock, flags); | |
415 | sctp_spin_lock(&list->lock); | |
416 | ||
417 | list_splice((struct list_head *)list, (struct list_head *)head->prev); | |
418 | ||
419 | head->qlen += list->qlen; | |
420 | list->qlen = 0; | |
421 | ||
422 | sctp_spin_unlock(&list->lock); | |
423 | sctp_spin_unlock_irqrestore(&head->lock, flags); | |
424 | } | |
425 | ||
426 | /** | |
427 | * sctp_list_dequeue - remove from the head of the queue | |
428 | * @list: list to dequeue from | |
429 | * | |
430 | * Remove the head of the list. The head item is | |
431 | * returned or %NULL if the list is empty. | |
432 | */ | |
433 | ||
434 | static inline struct list_head *sctp_list_dequeue(struct list_head *list) | |
435 | { | |
436 | struct list_head *result = NULL; | |
437 | ||
438 | if (list->next != list) { | |
439 | result = list->next; | |
440 | list->next = result->next; | |
441 | list->next->prev = list; | |
442 | INIT_LIST_HEAD(result); | |
443 | } | |
444 | return result; | |
445 | } | |
446 | ||
447 | /* Tests if the list has one and only one entry. */ | |
448 | static inline int sctp_list_single_entry(struct list_head *head) | |
449 | { | |
450 | return ((head->next != head) && (head->next == head->prev)); | |
451 | } | |
452 | ||
1da177e4 LT |
453 | /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ |
454 | static inline __s32 sctp_jitter(__u32 rto) | |
455 | { | |
456 | static __u32 sctp_rand; | |
457 | __s32 ret; | |
458 | ||
459 | /* Avoid divide by zero. */ | |
460 | if (!rto) | |
461 | rto = 1; | |
462 | ||
463 | sctp_rand += jiffies; | |
464 | sctp_rand ^= (sctp_rand << 12); | |
465 | sctp_rand ^= (sctp_rand >> 20); | |
466 | ||
467 | /* Choose random number from 0 to rto, then move to -50% ~ +50% | |
468 | * of rto. | |
469 | */ | |
470 | ret = sctp_rand % rto - (rto >> 1); | |
471 | return ret; | |
472 | } | |
473 | ||
474 | /* Break down data chunks at this point. */ | |
475 | static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) | |
476 | { | |
477 | int frag = pmtu; | |
478 | ||
479 | frag -= sp->pf->af->net_header_len; | |
480 | frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); | |
481 | ||
482 | if (sp->user_frag) | |
483 | frag = min_t(int, frag, sp->user_frag); | |
484 | ||
485 | frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); | |
486 | ||
487 | return frag; | |
488 | } | |
489 | ||
490 | /* Walk through a list of TLV parameters. Don't trust the | |
491 | * individual parameter lengths and instead depend on | |
492 | * the chunk length to indicate when to stop. Make sure | |
493 | * there is room for a param header too. | |
494 | */ | |
495 | #define sctp_walk_params(pos, chunk, member)\ | |
dd2d1c6f | 496 | _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) |
1da177e4 LT |
497 | |
498 | #define _sctp_walk_params(pos, chunk, end, member)\ | |
499 | for (pos.v = chunk->member;\ | |
500 | pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ | |
dd2d1c6f | 501 | pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
1da177e4 LT |
502 | ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ |
503 | pos.v += WORD_ROUND(ntohs(pos.p->length))) | |
504 | ||
505 | #define sctp_walk_errors(err, chunk_hdr)\ | |
506 | _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) | |
507 | ||
508 | #define _sctp_walk_errors(err, chunk_hdr, end)\ | |
509 | for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ | |
510 | sizeof(sctp_chunkhdr_t));\ | |
511 | (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ | |
dd2d1c6f | 512 | (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
1da177e4 LT |
513 | ntohs(err->length) >= sizeof(sctp_errhdr_t); \ |
514 | err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) | |
515 | ||
516 | #define sctp_walk_fwdtsn(pos, chunk)\ | |
517 | _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) | |
518 | ||
519 | #define _sctp_walk_fwdtsn(pos, chunk, end)\ | |
520 | for (pos = chunk->subh.fwdtsn_hdr->skip;\ | |
521 | (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ | |
522 | pos++) | |
523 | ||
524 | /* Round an int up to the next multiple of 4. */ | |
525 | #define WORD_ROUND(s) (((s)+3)&~3) | |
526 | ||
527 | /* Make a new instance of type. */ | |
528 | #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) | |
529 | ||
530 | /* Compare two timevals. */ | |
531 | #define tv_lt(s, t) \ | |
532 | (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) | |
533 | ||
534 | /* Add tv1 to tv2. */ | |
535 | #define TIMEVAL_ADD(tv1, tv2) \ | |
536 | ({ \ | |
537 | suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ | |
538 | time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ | |
539 | \ | |
540 | if (usecs >= 1000000) { \ | |
541 | usecs -= 1000000; \ | |
542 | secs++; \ | |
543 | } \ | |
544 | (tv2).tv_sec = secs; \ | |
545 | (tv2).tv_usec = usecs; \ | |
546 | }) | |
547 | ||
548 | /* External references. */ | |
549 | ||
550 | extern struct proto sctp_prot; | |
551 | extern struct proto sctpv6_prot; | |
552 | extern struct proc_dir_entry *proc_net_sctp; | |
553 | void sctp_put_port(struct sock *sk); | |
554 | ||
555 | extern struct idr sctp_assocs_id; | |
556 | extern spinlock_t sctp_assocs_id_lock; | |
557 | ||
558 | /* Static inline functions. */ | |
559 | ||
560 | /* Convert from an IP version number to an Address Family symbol. */ | |
561 | static inline int ipver2af(__u8 ipver) | |
562 | { | |
563 | switch (ipver) { | |
564 | case 4: | |
565 | return AF_INET; | |
566 | case 6: | |
567 | return AF_INET6; | |
568 | default: | |
569 | return 0; | |
570 | }; | |
571 | } | |
572 | ||
573 | /* Convert from an address parameter type to an address family. */ | |
574 | static inline int param_type2af(__u16 type) | |
575 | { | |
576 | switch (type) { | |
577 | case SCTP_PARAM_IPV4_ADDRESS: | |
578 | return AF_INET; | |
579 | case SCTP_PARAM_IPV6_ADDRESS: | |
580 | return AF_INET6; | |
581 | default: | |
582 | return 0; | |
583 | }; | |
584 | } | |
585 | ||
586 | /* Perform some sanity checks. */ | |
587 | static inline int sctp_sanity_check(void) | |
588 | { | |
589 | SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= | |
590 | sizeof(((struct sk_buff *)0)->cb), | |
591 | "SCTP: ulpevent does not fit in skb!\n", return 0); | |
592 | ||
593 | return 1; | |
594 | } | |
595 | ||
596 | /* Warning: The following hash functions assume a power of two 'size'. */ | |
597 | /* This is the hash function for the SCTP port hash table. */ | |
598 | static inline int sctp_phashfn(__u16 lport) | |
599 | { | |
600 | return (lport & (sctp_port_hashsize - 1)); | |
601 | } | |
602 | ||
603 | /* This is the hash function for the endpoint hash table. */ | |
604 | static inline int sctp_ep_hashfn(__u16 lport) | |
605 | { | |
606 | return (lport & (sctp_ep_hashsize - 1)); | |
607 | } | |
608 | ||
609 | /* This is the hash function for the association hash table. */ | |
610 | static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) | |
611 | { | |
612 | int h = (lport << 16) + rport; | |
613 | h ^= h>>8; | |
614 | return (h & (sctp_assoc_hashsize - 1)); | |
615 | } | |
616 | ||
617 | /* This is the hash function for the association hash table. This is | |
618 | * not used yet, but could be used as a better hash function when | |
619 | * we have a vtag. | |
620 | */ | |
621 | static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) | |
622 | { | |
623 | int h = (lport << 16) + rport; | |
624 | h ^= vtag; | |
625 | return (h & (sctp_assoc_hashsize-1)); | |
626 | } | |
627 | ||
628 | /* Is a socket of this style? */ | |
629 | #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) | |
630 | static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) | |
631 | { | |
632 | return sctp_sk(sk)->type == style; | |
633 | } | |
634 | ||
635 | /* Is the association in this state? */ | |
636 | #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) | |
637 | static inline int __sctp_state(const struct sctp_association *asoc, | |
638 | sctp_state_t state) | |
639 | { | |
640 | return asoc->state == state; | |
641 | } | |
642 | ||
643 | /* Is the socket in this state? */ | |
644 | #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) | |
645 | static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) | |
646 | { | |
647 | return sk->sk_state == state; | |
648 | } | |
649 | ||
650 | /* Map v4-mapped v6 address back to v4 address */ | |
651 | static inline void sctp_v6_map_v4(union sctp_addr *addr) | |
652 | { | |
653 | addr->v4.sin_family = AF_INET; | |
654 | addr->v4.sin_port = addr->v6.sin6_port; | |
655 | addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; | |
656 | } | |
657 | ||
658 | /* Map v4 address to v4-mapped v6 address */ | |
659 | static inline void sctp_v4_map_v6(union sctp_addr *addr) | |
660 | { | |
661 | addr->v6.sin6_family = AF_INET6; | |
662 | addr->v6.sin6_port = addr->v4.sin_port; | |
663 | addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; | |
664 | addr->v6.sin6_addr.s6_addr32[0] = 0; | |
665 | addr->v6.sin6_addr.s6_addr32[1] = 0; | |
666 | addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); | |
667 | } | |
668 | ||
669 | #endif /* __net_sctp_h__ */ |