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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 *); | |
4110cc25 | 159 | struct sock *sctp_err_lookup(struct net *net, 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); | |
ec18d9a2 DM |
165 | void sctp_icmp_redirect(struct sock *, struct sctp_transport *, |
166 | struct sk_buff *); | |
1da177e4 | 167 | void sctp_icmp_proto_unreachable(struct sock *sk, |
1da177e4 LT |
168 | struct sctp_association *asoc, |
169 | struct sctp_transport *t); | |
c4d2444e SS |
170 | void sctp_backlog_migrate(struct sctp_association *assoc, |
171 | struct sock *oldsk, struct sock *newsk); | |
1da177e4 | 172 | |
16164366 AB |
173 | /* |
174 | * sctp/proc.c | |
175 | */ | |
176 | int sctp_snmp_proc_init(void); | |
177 | void sctp_snmp_proc_exit(void); | |
178 | int sctp_eps_proc_init(void); | |
179 | void sctp_eps_proc_exit(void); | |
180 | int sctp_assocs_proc_init(void); | |
181 | void sctp_assocs_proc_exit(void); | |
20c2c1fd NH |
182 | int sctp_remaddr_proc_init(void); |
183 | void sctp_remaddr_proc_exit(void); | |
16164366 AB |
184 | |
185 | ||
0a5fcb9c | 186 | /* |
187 | * Module global variables | |
188 | */ | |
189 | ||
190 | /* | |
191 | * sctp/protocol.c | |
192 | */ | |
193 | extern struct kmem_cache *sctp_chunk_cachep __read_mostly; | |
194 | extern struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
195 | ||
1da177e4 LT |
196 | /* |
197 | * Section: Macros, externs, and inlines | |
198 | */ | |
199 | ||
200 | ||
201 | #ifdef TEST_FRAME | |
202 | #include <test_frame.h> | |
203 | #else | |
204 | ||
205 | /* spin lock wrappers. */ | |
206 | #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) | |
207 | #define sctp_spin_unlock_irqrestore(lock, flags) \ | |
208 | spin_unlock_irqrestore(lock, flags) | |
209 | #define sctp_local_bh_disable() local_bh_disable() | |
210 | #define sctp_local_bh_enable() local_bh_enable() | |
211 | #define sctp_spin_lock(lock) spin_lock(lock) | |
212 | #define sctp_spin_unlock(lock) spin_unlock(lock) | |
213 | #define sctp_write_lock(lock) write_lock(lock) | |
214 | #define sctp_write_unlock(lock) write_unlock(lock) | |
215 | #define sctp_read_lock(lock) read_lock(lock) | |
216 | #define sctp_read_unlock(lock) read_unlock(lock) | |
217 | ||
218 | /* sock lock wrappers. */ | |
219 | #define sctp_lock_sock(sk) lock_sock(sk) | |
220 | #define sctp_release_sock(sk) release_sock(sk) | |
221 | #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) | |
222 | #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) | |
1da177e4 LT |
223 | |
224 | /* SCTP SNMP MIB stats handlers */ | |
225 | DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); | |
226 | #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) | |
227 | #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) | |
228 | #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) | |
229 | #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) | |
230 | ||
231 | #endif /* !TEST_FRAME */ | |
232 | ||
ac0b0462 | 233 | /* sctp mib definitions */ |
fd2c3ef7 | 234 | enum { |
ac0b0462 SS |
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, | |
b6157d8e | 261 | SCTP_MIB_T1_RETRANSMITS, |
ac0b0462 SS |
262 | SCTP_MIB_T3_RETRANSMITS, |
263 | SCTP_MIB_PMTUD_RETRANSMITS, | |
264 | SCTP_MIB_FAST_RETRANSMITS, | |
265 | SCTP_MIB_IN_PKT_SOFTIRQ, | |
266 | SCTP_MIB_IN_PKT_BACKLOG, | |
267 | SCTP_MIB_IN_PKT_DISCARDS, | |
268 | SCTP_MIB_IN_DATA_CHUNK_DISCARDS, | |
269 | __SCTP_MIB_MAX | |
270 | }; | |
271 | ||
272 | #define SCTP_MIB_MAX __SCTP_MIB_MAX | |
273 | struct sctp_mib { | |
274 | unsigned long mibs[SCTP_MIB_MAX]; | |
ec733b15 | 275 | }; |
ac0b0462 | 276 | |
1da177e4 LT |
277 | |
278 | /* Print debugging messages. */ | |
279 | #if SCTP_DEBUG | |
280 | extern int sctp_debug_flag; | |
145ce502 JP |
281 | #define SCTP_DEBUG_PRINTK(fmt, args...) \ |
282 | do { \ | |
283 | if (sctp_debug_flag) \ | |
284 | printk(KERN_DEBUG pr_fmt(fmt), ##args); \ | |
285 | } while (0) | |
286 | #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \ | |
287 | do { \ | |
288 | if (sctp_debug_flag) \ | |
289 | pr_cont(fmt, ##args); \ | |
290 | } while (0) | |
291 | #define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \ | |
3ced2ddd | 292 | args_lead, addr, args_trail...) \ |
145ce502 | 293 | do { \ |
3ced2ddd | 294 | const union sctp_addr *_addr = (addr); \ |
145ce502 | 295 | if (sctp_debug_flag) { \ |
3ced2ddd | 296 | if (_addr->sa.sa_family == AF_INET6) { \ |
145ce502 JP |
297 | printk(KERN_DEBUG \ |
298 | pr_fmt(fmt_lead "%pI6" fmt_trail), \ | |
299 | args_lead, \ | |
3ced2ddd | 300 | &_addr->v6.sin6_addr, \ |
145ce502 JP |
301 | args_trail); \ |
302 | } else { \ | |
303 | printk(KERN_DEBUG \ | |
304 | pr_fmt(fmt_lead "%pI4" fmt_trail), \ | |
305 | args_lead, \ | |
3ced2ddd | 306 | &_addr->v4.sin_addr.s_addr, \ |
145ce502 JP |
307 | args_trail); \ |
308 | } \ | |
309 | } \ | |
310 | } while (0) | |
1da177e4 LT |
311 | #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } |
312 | #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } | |
313 | ||
314 | #define SCTP_ASSERT(expr, str, func) \ | |
315 | if (!(expr)) { \ | |
316 | SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ | |
d5c003b4 | 317 | str, (#expr), __FILE__, __func__, __LINE__); \ |
1da177e4 LT |
318 | func; \ |
319 | } | |
320 | ||
321 | #else /* SCTP_DEBUG */ | |
322 | ||
323 | #define SCTP_DEBUG_PRINTK(whatever...) | |
145ce502 | 324 | #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) |
3f7a87d2 | 325 | #define SCTP_DEBUG_PRINTK_IPADDR(whatever...) |
1da177e4 LT |
326 | #define SCTP_ENABLE_DEBUG |
327 | #define SCTP_DISABLE_DEBUG | |
65fd28f7 | 328 | #define SCTP_ASSERT(expr, str, func) |
1da177e4 LT |
329 | |
330 | #endif /* SCTP_DEBUG */ | |
331 | ||
332 | ||
333 | /* | |
334 | * Macros for keeping a global reference of object allocations. | |
335 | */ | |
336 | #ifdef CONFIG_SCTP_DBG_OBJCNT | |
337 | ||
338 | extern atomic_t sctp_dbg_objcnt_sock; | |
339 | extern atomic_t sctp_dbg_objcnt_ep; | |
340 | extern atomic_t sctp_dbg_objcnt_assoc; | |
341 | extern atomic_t sctp_dbg_objcnt_transport; | |
342 | extern atomic_t sctp_dbg_objcnt_chunk; | |
343 | extern atomic_t sctp_dbg_objcnt_bind_addr; | |
344 | extern atomic_t sctp_dbg_objcnt_bind_bucket; | |
345 | extern atomic_t sctp_dbg_objcnt_addr; | |
346 | extern atomic_t sctp_dbg_objcnt_ssnmap; | |
347 | extern atomic_t sctp_dbg_objcnt_datamsg; | |
1f485649 | 348 | extern atomic_t sctp_dbg_objcnt_keys; |
1da177e4 LT |
349 | |
350 | /* Macros to atomically increment/decrement objcnt counters. */ | |
351 | #define SCTP_DBG_OBJCNT_INC(name) \ | |
352 | atomic_inc(&sctp_dbg_objcnt_## name) | |
353 | #define SCTP_DBG_OBJCNT_DEC(name) \ | |
354 | atomic_dec(&sctp_dbg_objcnt_## name) | |
355 | #define SCTP_DBG_OBJCNT(name) \ | |
356 | atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) | |
357 | ||
358 | /* Macro to help create new entries in in the global array of | |
359 | * objcnt counters. | |
360 | */ | |
361 | #define SCTP_DBG_OBJCNT_ENTRY(name) \ | |
362 | {.label= #name, .counter= &sctp_dbg_objcnt_## name} | |
363 | ||
364 | void sctp_dbg_objcnt_init(void); | |
365 | void sctp_dbg_objcnt_exit(void); | |
366 | ||
367 | #else | |
368 | ||
369 | #define SCTP_DBG_OBJCNT_INC(name) | |
370 | #define SCTP_DBG_OBJCNT_DEC(name) | |
371 | ||
372 | static inline void sctp_dbg_objcnt_init(void) { return; } | |
373 | static inline void sctp_dbg_objcnt_exit(void) { return; } | |
374 | ||
375 | #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ | |
376 | ||
377 | #if defined CONFIG_SYSCTL | |
378 | void sctp_sysctl_register(void); | |
379 | void sctp_sysctl_unregister(void); | |
380 | #else | |
381 | static inline void sctp_sysctl_register(void) { return; } | |
382 | static inline void sctp_sysctl_unregister(void) { return; } | |
1da177e4 LT |
383 | #endif |
384 | ||
385 | /* Size of Supported Address Parameter for 'x' address types. */ | |
386 | #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) | |
387 | ||
dfd56b8b | 388 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 389 | |
270637ab VY |
390 | void sctp_v6_pf_init(void); |
391 | void sctp_v6_pf_exit(void); | |
392 | int sctp_v6_protosw_init(void); | |
393 | void sctp_v6_protosw_exit(void); | |
827bf122 SS |
394 | int sctp_v6_add_protocol(void); |
395 | void sctp_v6_del_protocol(void); | |
1da177e4 LT |
396 | |
397 | #else /* #ifdef defined(CONFIG_IPV6) */ | |
398 | ||
1233823b | 399 | static inline void sctp_v6_pf_init(void) { return; } |
270637ab VY |
400 | static inline void sctp_v6_pf_exit(void) { return; } |
401 | static inline int sctp_v6_protosw_init(void) { return 0; } | |
402 | static inline void sctp_v6_protosw_exit(void) { return; } | |
827bf122 SS |
403 | static inline int sctp_v6_add_protocol(void) { return 0; } |
404 | static inline void sctp_v6_del_protocol(void) { return; } | |
1da177e4 LT |
405 | |
406 | #endif /* #if defined(CONFIG_IPV6) */ | |
407 | ||
1da177e4 LT |
408 | |
409 | /* Map an association to an assoc_id. */ | |
410 | static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) | |
411 | { | |
a02cec21 | 412 | return asoc ? asoc->assoc_id : 0; |
1da177e4 LT |
413 | } |
414 | ||
415 | /* Look up the association by its id. */ | |
416 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); | |
417 | ||
0343c554 | 418 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); |
1da177e4 LT |
419 | |
420 | /* A macro to walk a list of skbs. */ | |
421 | #define sctp_skb_for_each(pos, head, tmp) \ | |
3d09274c | 422 | skb_queue_walk_safe(head, pos, tmp) |
1da177e4 LT |
423 | |
424 | /* A helper to append an entire skb list (list) to another (head). */ | |
425 | static inline void sctp_skb_list_tail(struct sk_buff_head *list, | |
426 | struct sk_buff_head *head) | |
427 | { | |
428 | unsigned long flags; | |
429 | ||
430 | sctp_spin_lock_irqsave(&head->lock, flags); | |
431 | sctp_spin_lock(&list->lock); | |
432 | ||
3d09274c | 433 | skb_queue_splice_tail_init(list, head); |
1da177e4 LT |
434 | |
435 | sctp_spin_unlock(&list->lock); | |
436 | sctp_spin_unlock_irqrestore(&head->lock, flags); | |
437 | } | |
438 | ||
439 | /** | |
440 | * sctp_list_dequeue - remove from the head of the queue | |
441 | * @list: list to dequeue from | |
442 | * | |
443 | * Remove the head of the list. The head item is | |
444 | * returned or %NULL if the list is empty. | |
445 | */ | |
446 | ||
447 | static inline struct list_head *sctp_list_dequeue(struct list_head *list) | |
448 | { | |
449 | struct list_head *result = NULL; | |
450 | ||
451 | if (list->next != list) { | |
452 | result = list->next; | |
453 | list->next = result->next; | |
454 | list->next->prev = list; | |
455 | INIT_LIST_HEAD(result); | |
456 | } | |
457 | return result; | |
458 | } | |
459 | ||
331c4ee7 VY |
460 | /* SCTP version of skb_set_owner_r. We need this one because |
461 | * of the way we have to do receive buffer accounting on bundled | |
462 | * chunks. | |
463 | */ | |
464 | static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
465 | { | |
466 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
467 | ||
d55d87fd | 468 | skb_orphan(skb); |
331c4ee7 VY |
469 | skb->sk = sk; |
470 | skb->destructor = sctp_sock_rfree; | |
471 | atomic_add(event->rmem_len, &sk->sk_rmem_alloc); | |
4d93df0a | 472 | /* |
3ab224be | 473 | * This mimics the behavior of skb_set_owner_r |
4d93df0a NH |
474 | */ |
475 | sk->sk_forward_alloc -= event->rmem_len; | |
331c4ee7 VY |
476 | } |
477 | ||
1da177e4 LT |
478 | /* Tests if the list has one and only one entry. */ |
479 | static inline int sctp_list_single_entry(struct list_head *head) | |
480 | { | |
a02cec21 | 481 | return (head->next != head) && (head->next == head->prev); |
1da177e4 LT |
482 | } |
483 | ||
1da177e4 LT |
484 | /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ |
485 | static inline __s32 sctp_jitter(__u32 rto) | |
486 | { | |
487 | static __u32 sctp_rand; | |
488 | __s32 ret; | |
489 | ||
490 | /* Avoid divide by zero. */ | |
491 | if (!rto) | |
492 | rto = 1; | |
493 | ||
494 | sctp_rand += jiffies; | |
495 | sctp_rand ^= (sctp_rand << 12); | |
496 | sctp_rand ^= (sctp_rand >> 20); | |
497 | ||
498 | /* Choose random number from 0 to rto, then move to -50% ~ +50% | |
499 | * of rto. | |
500 | */ | |
501 | ret = sctp_rand % rto - (rto >> 1); | |
502 | return ret; | |
503 | } | |
504 | ||
505 | /* Break down data chunks at this point. */ | |
f68b2e05 | 506 | static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) |
1da177e4 | 507 | { |
f68b2e05 | 508 | struct sctp_sock *sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
509 | int frag = pmtu; |
510 | ||
511 | frag -= sp->pf->af->net_header_len; | |
512 | frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); | |
513 | ||
f68b2e05 VY |
514 | if (asoc->user_frag) |
515 | frag = min_t(int, frag, asoc->user_frag); | |
1da177e4 LT |
516 | |
517 | frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); | |
518 | ||
519 | return frag; | |
520 | } | |
521 | ||
02f3d4ce | 522 | static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) |
8a479491 VY |
523 | { |
524 | ||
02f3d4ce | 525 | sctp_assoc_sync_pmtu(sk, asoc); |
8a479491 VY |
526 | asoc->pmtu_pending = 0; |
527 | } | |
528 | ||
1da177e4 LT |
529 | /* Walk through a list of TLV parameters. Don't trust the |
530 | * individual parameter lengths and instead depend on | |
531 | * the chunk length to indicate when to stop. Make sure | |
532 | * there is room for a param header too. | |
533 | */ | |
534 | #define sctp_walk_params(pos, chunk, member)\ | |
dd2d1c6f | 535 | _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) |
1da177e4 LT |
536 | |
537 | #define _sctp_walk_params(pos, chunk, end, member)\ | |
538 | for (pos.v = chunk->member;\ | |
dd2d1c6f | 539 | pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
1da177e4 LT |
540 | ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ |
541 | pos.v += WORD_ROUND(ntohs(pos.p->length))) | |
542 | ||
543 | #define sctp_walk_errors(err, chunk_hdr)\ | |
544 | _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) | |
545 | ||
546 | #define _sctp_walk_errors(err, chunk_hdr, end)\ | |
547 | for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ | |
548 | sizeof(sctp_chunkhdr_t));\ | |
dd2d1c6f | 549 | (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
1da177e4 LT |
550 | ntohs(err->length) >= sizeof(sctp_errhdr_t); \ |
551 | err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) | |
552 | ||
553 | #define sctp_walk_fwdtsn(pos, chunk)\ | |
554 | _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) | |
555 | ||
556 | #define _sctp_walk_fwdtsn(pos, chunk, end)\ | |
557 | for (pos = chunk->subh.fwdtsn_hdr->skip;\ | |
558 | (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ | |
559 | pos++) | |
560 | ||
561 | /* Round an int up to the next multiple of 4. */ | |
562 | #define WORD_ROUND(s) (((s)+3)&~3) | |
563 | ||
564 | /* Make a new instance of type. */ | |
b2cf9b6b | 565 | #define t_new(type, flags) (type *)kzalloc(sizeof(type), flags) |
1da177e4 LT |
566 | |
567 | /* Compare two timevals. */ | |
568 | #define tv_lt(s, t) \ | |
569 | (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) | |
570 | ||
571 | /* Add tv1 to tv2. */ | |
572 | #define TIMEVAL_ADD(tv1, tv2) \ | |
573 | ({ \ | |
574 | suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ | |
575 | time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ | |
576 | \ | |
577 | if (usecs >= 1000000) { \ | |
578 | usecs -= 1000000; \ | |
579 | secs++; \ | |
580 | } \ | |
581 | (tv2).tv_sec = secs; \ | |
582 | (tv2).tv_usec = usecs; \ | |
583 | }) | |
584 | ||
585 | /* External references. */ | |
586 | ||
587 | extern struct proto sctp_prot; | |
588 | extern struct proto sctpv6_prot; | |
589 | extern struct proc_dir_entry *proc_net_sctp; | |
590 | void sctp_put_port(struct sock *sk); | |
591 | ||
592 | extern struct idr sctp_assocs_id; | |
593 | extern spinlock_t sctp_assocs_id_lock; | |
594 | ||
595 | /* Static inline functions. */ | |
596 | ||
597 | /* Convert from an IP version number to an Address Family symbol. */ | |
598 | static inline int ipver2af(__u8 ipver) | |
599 | { | |
600 | switch (ipver) { | |
601 | case 4: | |
602 | return AF_INET; | |
603 | case 6: | |
604 | return AF_INET6; | |
605 | default: | |
606 | return 0; | |
e3cc055c | 607 | } |
1da177e4 LT |
608 | } |
609 | ||
610 | /* Convert from an address parameter type to an address family. */ | |
dbc16db1 | 611 | static inline int param_type2af(__be16 type) |
1da177e4 LT |
612 | { |
613 | switch (type) { | |
614 | case SCTP_PARAM_IPV4_ADDRESS: | |
615 | return AF_INET; | |
616 | case SCTP_PARAM_IPV6_ADDRESS: | |
617 | return AF_INET6; | |
618 | default: | |
619 | return 0; | |
e3cc055c | 620 | } |
1da177e4 LT |
621 | } |
622 | ||
623 | /* Perform some sanity checks. */ | |
624 | static inline int sctp_sanity_check(void) | |
625 | { | |
626 | SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= | |
627 | sizeof(((struct sk_buff *)0)->cb), | |
628 | "SCTP: ulpevent does not fit in skb!\n", return 0); | |
629 | ||
630 | return 1; | |
631 | } | |
632 | ||
633 | /* Warning: The following hash functions assume a power of two 'size'. */ | |
634 | /* This is the hash function for the SCTP port hash table. */ | |
f1f43763 | 635 | static inline int sctp_phashfn(struct net *net, __u16 lport) |
1da177e4 | 636 | { |
f1f43763 | 637 | return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); |
1da177e4 LT |
638 | } |
639 | ||
640 | /* This is the hash function for the endpoint hash table. */ | |
4cdadcbc | 641 | static inline int sctp_ep_hashfn(struct net *net, __u16 lport) |
1da177e4 | 642 | { |
4cdadcbc | 643 | return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); |
1da177e4 LT |
644 | } |
645 | ||
646 | /* This is the hash function for the association hash table. */ | |
4110cc25 | 647 | static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport) |
1da177e4 | 648 | { |
4110cc25 | 649 | int h = (lport << 16) + rport + net_hash_mix(net); |
1da177e4 | 650 | h ^= h>>8; |
a02cec21 | 651 | return h & (sctp_assoc_hashsize - 1); |
1da177e4 LT |
652 | } |
653 | ||
654 | /* This is the hash function for the association hash table. This is | |
655 | * not used yet, but could be used as a better hash function when | |
656 | * we have a vtag. | |
657 | */ | |
658 | static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) | |
659 | { | |
660 | int h = (lport << 16) + rport; | |
661 | h ^= vtag; | |
a02cec21 | 662 | return h & (sctp_assoc_hashsize - 1); |
1da177e4 LT |
663 | } |
664 | ||
d970dbf8 VY |
665 | #define sctp_for_each_hentry(epb, node, head) \ |
666 | hlist_for_each_entry(epb, node, head, node) | |
667 | ||
1da177e4 LT |
668 | /* Is a socket of this style? */ |
669 | #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) | |
670 | static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) | |
671 | { | |
672 | return sctp_sk(sk)->type == style; | |
673 | } | |
674 | ||
675 | /* Is the association in this state? */ | |
676 | #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) | |
677 | static inline int __sctp_state(const struct sctp_association *asoc, | |
678 | sctp_state_t state) | |
679 | { | |
680 | return asoc->state == state; | |
681 | } | |
682 | ||
683 | /* Is the socket in this state? */ | |
684 | #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) | |
685 | static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) | |
686 | { | |
687 | return sk->sk_state == state; | |
688 | } | |
689 | ||
690 | /* Map v4-mapped v6 address back to v4 address */ | |
691 | static inline void sctp_v6_map_v4(union sctp_addr *addr) | |
692 | { | |
693 | addr->v4.sin_family = AF_INET; | |
694 | addr->v4.sin_port = addr->v6.sin6_port; | |
695 | addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; | |
696 | } | |
697 | ||
698 | /* Map v4 address to v4-mapped v6 address */ | |
699 | static inline void sctp_v4_map_v6(union sctp_addr *addr) | |
700 | { | |
701 | addr->v6.sin6_family = AF_INET6; | |
702 | addr->v6.sin6_port = addr->v4.sin_port; | |
703 | addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; | |
704 | addr->v6.sin6_addr.s6_addr32[0] = 0; | |
705 | addr->v6.sin6_addr.s6_addr32[1] = 0; | |
706 | addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); | |
707 | } | |
708 | ||
e0268868 ND |
709 | /* The cookie is always 0 since this is how it's used in the |
710 | * pmtu code. | |
711 | */ | |
712 | static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) | |
713 | { | |
714 | if (t->dst && !dst_check(t->dst, 0)) { | |
715 | dst_release(t->dst); | |
716 | t->dst = NULL; | |
717 | } | |
718 | ||
719 | return t->dst; | |
720 | } | |
721 | ||
1da177e4 | 722 | #endif /* __net_sctp_h__ */ |