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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
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 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
8 | * |
9 | * The base lksctp header. | |
10 | * | |
60c778b2 | 11 | * This SCTP implementation is free software; |
1da177e4 LT |
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 | * | |
60c778b2 | 17 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
dfd56b8b | 74 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
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 int sctp_copy_local_addr_list(struct sctp_bind_addr *, | |
dd0fc66f | 119 | sctp_scope_t, gfp_t gfp, |
3182cd84 | 120 | int flags); |
1da177e4 LT |
121 | extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); |
122 | extern int sctp_register_pf(struct sctp_pf *, sa_family_t); | |
9f7d653b | 123 | extern void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *, int); |
1da177e4 LT |
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); | |
561b1733 | 131 | void sctp_data_ready(struct sock *sk, int len); |
1da177e4 LT |
132 | unsigned int sctp_poll(struct file *file, struct socket *sock, |
133 | poll_table *wait); | |
331c4ee7 | 134 | void sctp_sock_rfree(struct sk_buff *skb); |
914e1c8b VY |
135 | void sctp_copy_sock(struct sock *newsk, struct sock *sk, |
136 | struct sctp_association *asoc); | |
1748376b | 137 | extern struct percpu_counter sctp_sockets_allocated; |
9f7d653b | 138 | extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); |
1da177e4 LT |
139 | |
140 | /* | |
141 | * sctp/primitive.c | |
142 | */ | |
143 | int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); | |
144 | int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); | |
145 | int sctp_primitive_ABORT(struct sctp_association *, void *arg); | |
146 | int sctp_primitive_SEND(struct sctp_association *, void *arg); | |
147 | int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); | |
148 | int sctp_primitive_ASCONF(struct sctp_association *, void *arg); | |
149 | ||
1da177e4 LT |
150 | /* |
151 | * sctp/input.c | |
152 | */ | |
153 | int sctp_rcv(struct sk_buff *skb); | |
154 | void sctp_v4_err(struct sk_buff *skb, u32 info); | |
155 | void sctp_hash_established(struct sctp_association *); | |
156 | void sctp_unhash_established(struct sctp_association *); | |
157 | void sctp_hash_endpoint(struct sctp_endpoint *); | |
158 | void sctp_unhash_endpoint(struct sctp_endpoint *); | |
159 | struct sock *sctp_err_lookup(int family, struct sk_buff *, | |
d1ad1ff2 | 160 | struct sctphdr *, struct sctp_association **, |
1da177e4 | 161 | struct sctp_transport **); |
d1ad1ff2 | 162 | void sctp_err_finish(struct sock *, struct sctp_association *); |
1da177e4 LT |
163 | void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, |
164 | struct sctp_transport *t, __u32 pmtu); | |
165 | void sctp_icmp_proto_unreachable(struct sock *sk, | |
1da177e4 LT |
166 | struct sctp_association *asoc, |
167 | struct sctp_transport *t); | |
c4d2444e SS |
168 | void sctp_backlog_migrate(struct sctp_association *assoc, |
169 | struct sock *oldsk, struct sock *newsk); | |
1da177e4 | 170 | |
16164366 AB |
171 | /* |
172 | * sctp/proc.c | |
173 | */ | |
174 | int sctp_snmp_proc_init(void); | |
175 | void sctp_snmp_proc_exit(void); | |
176 | int sctp_eps_proc_init(void); | |
177 | void sctp_eps_proc_exit(void); | |
178 | int sctp_assocs_proc_init(void); | |
179 | void sctp_assocs_proc_exit(void); | |
20c2c1fd NH |
180 | int sctp_remaddr_proc_init(void); |
181 | void sctp_remaddr_proc_exit(void); | |
16164366 AB |
182 | |
183 | ||
0a5fcb9c | 184 | /* |
185 | * Module global variables | |
186 | */ | |
187 | ||
188 | /* | |
189 | * sctp/protocol.c | |
190 | */ | |
191 | extern struct kmem_cache *sctp_chunk_cachep __read_mostly; | |
192 | extern struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
193 | ||
1da177e4 LT |
194 | /* |
195 | * Section: Macros, externs, and inlines | |
196 | */ | |
197 | ||
198 | ||
199 | #ifdef TEST_FRAME | |
200 | #include <test_frame.h> | |
201 | #else | |
202 | ||
203 | /* spin lock wrappers. */ | |
204 | #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) | |
205 | #define sctp_spin_unlock_irqrestore(lock, flags) \ | |
206 | spin_unlock_irqrestore(lock, flags) | |
207 | #define sctp_local_bh_disable() local_bh_disable() | |
208 | #define sctp_local_bh_enable() local_bh_enable() | |
209 | #define sctp_spin_lock(lock) spin_lock(lock) | |
210 | #define sctp_spin_unlock(lock) spin_unlock(lock) | |
211 | #define sctp_write_lock(lock) write_lock(lock) | |
212 | #define sctp_write_unlock(lock) write_unlock(lock) | |
213 | #define sctp_read_lock(lock) read_lock(lock) | |
214 | #define sctp_read_unlock(lock) read_unlock(lock) | |
215 | ||
216 | /* sock lock wrappers. */ | |
217 | #define sctp_lock_sock(sk) lock_sock(sk) | |
218 | #define sctp_release_sock(sk) release_sock(sk) | |
219 | #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) | |
220 | #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) | |
1da177e4 LT |
221 | |
222 | /* SCTP SNMP MIB stats handlers */ | |
223 | DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); | |
224 | #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) | |
225 | #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) | |
226 | #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) | |
227 | #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) | |
228 | ||
229 | #endif /* !TEST_FRAME */ | |
230 | ||
ac0b0462 | 231 | /* sctp mib definitions */ |
fd2c3ef7 | 232 | enum { |
ac0b0462 SS |
233 | SCTP_MIB_NUM = 0, |
234 | SCTP_MIB_CURRESTAB, /* CurrEstab */ | |
235 | SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ | |
236 | SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ | |
237 | SCTP_MIB_ABORTEDS, /* Aborteds */ | |
238 | SCTP_MIB_SHUTDOWNS, /* Shutdowns */ | |
239 | SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ | |
240 | SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ | |
241 | SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ | |
242 | SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ | |
243 | SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ | |
244 | SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ | |
245 | SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ | |
246 | SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ | |
247 | SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ | |
248 | SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ | |
249 | SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ | |
250 | SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ | |
251 | SCTP_MIB_T1_INIT_EXPIREDS, | |
252 | SCTP_MIB_T1_COOKIE_EXPIREDS, | |
253 | SCTP_MIB_T2_SHUTDOWN_EXPIREDS, | |
254 | SCTP_MIB_T3_RTX_EXPIREDS, | |
255 | SCTP_MIB_T4_RTO_EXPIREDS, | |
256 | SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, | |
257 | SCTP_MIB_DELAY_SACK_EXPIREDS, | |
258 | SCTP_MIB_AUTOCLOSE_EXPIREDS, | |
b6157d8e | 259 | SCTP_MIB_T1_RETRANSMITS, |
ac0b0462 SS |
260 | SCTP_MIB_T3_RETRANSMITS, |
261 | SCTP_MIB_PMTUD_RETRANSMITS, | |
262 | SCTP_MIB_FAST_RETRANSMITS, | |
263 | SCTP_MIB_IN_PKT_SOFTIRQ, | |
264 | SCTP_MIB_IN_PKT_BACKLOG, | |
265 | SCTP_MIB_IN_PKT_DISCARDS, | |
266 | SCTP_MIB_IN_DATA_CHUNK_DISCARDS, | |
267 | __SCTP_MIB_MAX | |
268 | }; | |
269 | ||
270 | #define SCTP_MIB_MAX __SCTP_MIB_MAX | |
271 | struct sctp_mib { | |
272 | unsigned long mibs[SCTP_MIB_MAX]; | |
ec733b15 | 273 | }; |
ac0b0462 | 274 | |
1da177e4 LT |
275 | |
276 | /* Print debugging messages. */ | |
277 | #if SCTP_DEBUG | |
278 | extern int sctp_debug_flag; | |
145ce502 JP |
279 | #define SCTP_DEBUG_PRINTK(fmt, args...) \ |
280 | do { \ | |
281 | if (sctp_debug_flag) \ | |
282 | printk(KERN_DEBUG pr_fmt(fmt), ##args); \ | |
283 | } while (0) | |
284 | #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \ | |
285 | do { \ | |
286 | if (sctp_debug_flag) \ | |
287 | pr_cont(fmt, ##args); \ | |
288 | } while (0) | |
289 | #define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \ | |
3ced2ddd | 290 | args_lead, addr, args_trail...) \ |
145ce502 | 291 | do { \ |
3ced2ddd | 292 | const union sctp_addr *_addr = (addr); \ |
145ce502 | 293 | if (sctp_debug_flag) { \ |
3ced2ddd | 294 | if (_addr->sa.sa_family == AF_INET6) { \ |
145ce502 JP |
295 | printk(KERN_DEBUG \ |
296 | pr_fmt(fmt_lead "%pI6" fmt_trail), \ | |
297 | args_lead, \ | |
3ced2ddd | 298 | &_addr->v6.sin6_addr, \ |
145ce502 JP |
299 | args_trail); \ |
300 | } else { \ | |
301 | printk(KERN_DEBUG \ | |
302 | pr_fmt(fmt_lead "%pI4" fmt_trail), \ | |
303 | args_lead, \ | |
3ced2ddd | 304 | &_addr->v4.sin_addr.s_addr, \ |
145ce502 JP |
305 | args_trail); \ |
306 | } \ | |
307 | } \ | |
308 | } while (0) | |
1da177e4 LT |
309 | #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } |
310 | #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } | |
311 | ||
312 | #define SCTP_ASSERT(expr, str, func) \ | |
313 | if (!(expr)) { \ | |
314 | SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ | |
d5c003b4 | 315 | str, (#expr), __FILE__, __func__, __LINE__); \ |
1da177e4 LT |
316 | func; \ |
317 | } | |
318 | ||
319 | #else /* SCTP_DEBUG */ | |
320 | ||
321 | #define SCTP_DEBUG_PRINTK(whatever...) | |
145ce502 | 322 | #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) |
3f7a87d2 | 323 | #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) |
1da177e4 LT |
324 | #define SCTP_ENABLE_DEBUG |
325 | #define SCTP_DISABLE_DEBUG | |
65fd28f7 | 326 | #define SCTP_ASSERT(expr, str, func) |
1da177e4 LT |
327 | |
328 | #endif /* SCTP_DEBUG */ | |
329 | ||
330 | ||
331 | /* | |
332 | * Macros for keeping a global reference of object allocations. | |
333 | */ | |
334 | #ifdef CONFIG_SCTP_DBG_OBJCNT | |
335 | ||
336 | extern atomic_t sctp_dbg_objcnt_sock; | |
337 | extern atomic_t sctp_dbg_objcnt_ep; | |
338 | extern atomic_t sctp_dbg_objcnt_assoc; | |
339 | extern atomic_t sctp_dbg_objcnt_transport; | |
340 | extern atomic_t sctp_dbg_objcnt_chunk; | |
341 | extern atomic_t sctp_dbg_objcnt_bind_addr; | |
342 | extern atomic_t sctp_dbg_objcnt_bind_bucket; | |
343 | extern atomic_t sctp_dbg_objcnt_addr; | |
344 | extern atomic_t sctp_dbg_objcnt_ssnmap; | |
345 | extern atomic_t sctp_dbg_objcnt_datamsg; | |
1f485649 | 346 | extern atomic_t sctp_dbg_objcnt_keys; |
1da177e4 LT |
347 | |
348 | /* Macros to atomically increment/decrement objcnt counters. */ | |
349 | #define SCTP_DBG_OBJCNT_INC(name) \ | |
350 | atomic_inc(&sctp_dbg_objcnt_## name) | |
351 | #define SCTP_DBG_OBJCNT_DEC(name) \ | |
352 | atomic_dec(&sctp_dbg_objcnt_## name) | |
353 | #define SCTP_DBG_OBJCNT(name) \ | |
354 | atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) | |
355 | ||
356 | /* Macro to help create new entries in in the global array of | |
357 | * objcnt counters. | |
358 | */ | |
359 | #define SCTP_DBG_OBJCNT_ENTRY(name) \ | |
360 | {.label= #name, .counter= &sctp_dbg_objcnt_## name} | |
361 | ||
362 | void sctp_dbg_objcnt_init(void); | |
363 | void sctp_dbg_objcnt_exit(void); | |
364 | ||
365 | #else | |
366 | ||
367 | #define SCTP_DBG_OBJCNT_INC(name) | |
368 | #define SCTP_DBG_OBJCNT_DEC(name) | |
369 | ||
370 | static inline void sctp_dbg_objcnt_init(void) { return; } | |
371 | static inline void sctp_dbg_objcnt_exit(void) { return; } | |
372 | ||
373 | #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ | |
374 | ||
375 | #if defined CONFIG_SYSCTL | |
376 | void sctp_sysctl_register(void); | |
377 | void sctp_sysctl_unregister(void); | |
378 | #else | |
379 | static inline void sctp_sysctl_register(void) { return; } | |
380 | static inline void sctp_sysctl_unregister(void) { return; } | |
1da177e4 LT |
381 | #endif |
382 | ||
383 | /* Size of Supported Address Parameter for 'x' address types. */ | |
384 | #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) | |
385 | ||
dfd56b8b | 386 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 387 | |
270637ab VY |
388 | void sctp_v6_pf_init(void); |
389 | void sctp_v6_pf_exit(void); | |
390 | int sctp_v6_protosw_init(void); | |
391 | void sctp_v6_protosw_exit(void); | |
827bf122 SS |
392 | int sctp_v6_add_protocol(void); |
393 | void sctp_v6_del_protocol(void); | |
1da177e4 LT |
394 | |
395 | #else /* #ifdef defined(CONFIG_IPV6) */ | |
396 | ||
1233823b | 397 | static inline void sctp_v6_pf_init(void) { return; } |
270637ab VY |
398 | static inline void sctp_v6_pf_exit(void) { return; } |
399 | static inline int sctp_v6_protosw_init(void) { return 0; } | |
400 | static inline void sctp_v6_protosw_exit(void) { return; } | |
827bf122 SS |
401 | static inline int sctp_v6_add_protocol(void) { return 0; } |
402 | static inline void sctp_v6_del_protocol(void) { return; } | |
1da177e4 LT |
403 | |
404 | #endif /* #if defined(CONFIG_IPV6) */ | |
405 | ||
1da177e4 LT |
406 | |
407 | /* Map an association to an assoc_id. */ | |
408 | static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) | |
409 | { | |
a02cec21 | 410 | return asoc ? asoc->assoc_id : 0; |
1da177e4 LT |
411 | } |
412 | ||
413 | /* Look up the association by its id. */ | |
414 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); | |
415 | ||
416 | ||
417 | /* A macro to walk a list of skbs. */ | |
418 | #define sctp_skb_for_each(pos, head, tmp) \ | |
3d09274c | 419 | skb_queue_walk_safe(head, pos, tmp) |
1da177e4 LT |
420 | |
421 | /* A helper to append an entire skb list (list) to another (head). */ | |
422 | static inline void sctp_skb_list_tail(struct sk_buff_head *list, | |
423 | struct sk_buff_head *head) | |
424 | { | |
425 | unsigned long flags; | |
426 | ||
427 | sctp_spin_lock_irqsave(&head->lock, flags); | |
428 | sctp_spin_lock(&list->lock); | |
429 | ||
3d09274c | 430 | skb_queue_splice_tail_init(list, head); |
1da177e4 LT |
431 | |
432 | sctp_spin_unlock(&list->lock); | |
433 | sctp_spin_unlock_irqrestore(&head->lock, flags); | |
434 | } | |
435 | ||
436 | /** | |
437 | * sctp_list_dequeue - remove from the head of the queue | |
438 | * @list: list to dequeue from | |
439 | * | |
440 | * Remove the head of the list. The head item is | |
441 | * returned or %NULL if the list is empty. | |
442 | */ | |
443 | ||
444 | static inline struct list_head *sctp_list_dequeue(struct list_head *list) | |
445 | { | |
446 | struct list_head *result = NULL; | |
447 | ||
448 | if (list->next != list) { | |
449 | result = list->next; | |
450 | list->next = result->next; | |
451 | list->next->prev = list; | |
452 | INIT_LIST_HEAD(result); | |
453 | } | |
454 | return result; | |
455 | } | |
456 | ||
331c4ee7 VY |
457 | /* SCTP version of skb_set_owner_r. We need this one because |
458 | * of the way we have to do receive buffer accounting on bundled | |
459 | * chunks. | |
460 | */ | |
461 | static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
462 | { | |
463 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
464 | ||
d55d87fd | 465 | skb_orphan(skb); |
331c4ee7 VY |
466 | skb->sk = sk; |
467 | skb->destructor = sctp_sock_rfree; | |
468 | atomic_add(event->rmem_len, &sk->sk_rmem_alloc); | |
4d93df0a | 469 | /* |
3ab224be | 470 | * This mimics the behavior of skb_set_owner_r |
4d93df0a NH |
471 | */ |
472 | sk->sk_forward_alloc -= event->rmem_len; | |
331c4ee7 VY |
473 | } |
474 | ||
1da177e4 LT |
475 | /* Tests if the list has one and only one entry. */ |
476 | static inline int sctp_list_single_entry(struct list_head *head) | |
477 | { | |
a02cec21 | 478 | return (head->next != head) && (head->next == head->prev); |
1da177e4 LT |
479 | } |
480 | ||
1da177e4 LT |
481 | /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ |
482 | static inline __s32 sctp_jitter(__u32 rto) | |
483 | { | |
484 | static __u32 sctp_rand; | |
485 | __s32 ret; | |
486 | ||
487 | /* Avoid divide by zero. */ | |
488 | if (!rto) | |
489 | rto = 1; | |
490 | ||
491 | sctp_rand += jiffies; | |
492 | sctp_rand ^= (sctp_rand << 12); | |
493 | sctp_rand ^= (sctp_rand >> 20); | |
494 | ||
495 | /* Choose random number from 0 to rto, then move to -50% ~ +50% | |
496 | * of rto. | |
497 | */ | |
498 | ret = sctp_rand % rto - (rto >> 1); | |
499 | return ret; | |
500 | } | |
501 | ||
502 | /* Break down data chunks at this point. */ | |
f68b2e05 | 503 | static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) |
1da177e4 | 504 | { |
f68b2e05 | 505 | struct sctp_sock *sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
506 | int frag = pmtu; |
507 | ||
508 | frag -= sp->pf->af->net_header_len; | |
509 | frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); | |
510 | ||
f68b2e05 VY |
511 | if (asoc->user_frag) |
512 | frag = min_t(int, frag, asoc->user_frag); | |
1da177e4 LT |
513 | |
514 | frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); | |
515 | ||
516 | return frag; | |
517 | } | |
518 | ||
8a479491 VY |
519 | static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc) |
520 | { | |
521 | ||
522 | sctp_assoc_sync_pmtu(asoc); | |
523 | asoc->pmtu_pending = 0; | |
524 | } | |
525 | ||
1da177e4 LT |
526 | /* Walk through a list of TLV parameters. Don't trust the |
527 | * individual parameter lengths and instead depend on | |
528 | * the chunk length to indicate when to stop. Make sure | |
529 | * there is room for a param header too. | |
530 | */ | |
531 | #define sctp_walk_params(pos, chunk, member)\ | |
dd2d1c6f | 532 | _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) |
1da177e4 LT |
533 | |
534 | #define _sctp_walk_params(pos, chunk, end, member)\ | |
535 | for (pos.v = chunk->member;\ | |
dd2d1c6f | 536 | pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
1da177e4 LT |
537 | ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ |
538 | pos.v += WORD_ROUND(ntohs(pos.p->length))) | |
539 | ||
540 | #define sctp_walk_errors(err, chunk_hdr)\ | |
541 | _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) | |
542 | ||
543 | #define _sctp_walk_errors(err, chunk_hdr, end)\ | |
544 | for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ | |
545 | sizeof(sctp_chunkhdr_t));\ | |
dd2d1c6f | 546 | (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
1da177e4 LT |
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. */ | |
b2cf9b6b | 562 | #define t_new(type, flags) (type *)kzalloc(sizeof(type), flags) |
1da177e4 LT |
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. */ | |
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; | |
e3cc055c | 604 | } |
1da177e4 LT |
605 | } |
606 | ||
607 | /* Convert from an address parameter type to an address family. */ | |
dbc16db1 | 608 | static inline int param_type2af(__be16 type) |
1da177e4 LT |
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; | |
e3cc055c | 617 | } |
1da177e4 LT |
618 | } |
619 | ||
620 | /* Perform some sanity checks. */ | |
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. */ | |
632 | static inline int sctp_phashfn(__u16 lport) | |
633 | { | |
a02cec21 | 634 | return lport & (sctp_port_hashsize - 1); |
1da177e4 LT |
635 | } |
636 | ||
637 | /* This is the hash function for the endpoint hash table. */ | |
638 | static inline int sctp_ep_hashfn(__u16 lport) | |
639 | { | |
a02cec21 | 640 | return lport & (sctp_ep_hashsize - 1); |
1da177e4 LT |
641 | } |
642 | ||
643 | /* This is the hash function for the association hash table. */ | |
644 | static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) | |
645 | { | |
646 | int h = (lport << 16) + rport; | |
647 | h ^= h>>8; | |
a02cec21 | 648 | return h & (sctp_assoc_hashsize - 1); |
1da177e4 LT |
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 | */ | |
655 | static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) | |
656 | { | |
657 | int h = (lport << 16) + rport; | |
658 | h ^= vtag; | |
a02cec21 | 659 | return h & (sctp_assoc_hashsize - 1); |
1da177e4 LT |
660 | } |
661 | ||
d970dbf8 VY |
662 | #define sctp_for_each_hentry(epb, node, head) \ |
663 | hlist_for_each_entry(epb, node, head, node) | |
664 | ||
1da177e4 LT |
665 | /* Is a socket of this style? */ |
666 | #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##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)) | |
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)) | |
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 */ | |
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 */ | |
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__ */ |