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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): | |
91705c61 | 30 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 31 | * |
1da177e4 LT |
32 | * Written or modified by: |
33 | * La Monte H.P. Yarroll <piggy@acm.org> | |
34 | * Xingang Guo <xingang.guo@intel.com> | |
35 | * Jon Grimm <jgrimm@us.ibm.com> | |
36 | * Daisy Chang <daisyc@us.ibm.com> | |
37 | * Sridhar Samudrala <sri@us.ibm.com> | |
38 | * Ardelle Fan <ardelle.fan@intel.com> | |
39 | * Ryan Layer <rmlayer@us.ibm.com> | |
40 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
41 | */ |
42 | ||
43 | #ifndef __net_sctp_h__ | |
44 | #define __net_sctp_h__ | |
45 | ||
46 | /* Header Strategy. | |
47 | * Start getting some control over the header file depencies: | |
48 | * includes | |
49 | * constants | |
50 | * structs | |
51 | * prototypes | |
52 | * macros, externs, and inlines | |
53 | * | |
54 | * Move test_frame specific items out of the kernel headers | |
55 | * and into the test frame headers. This is not perfect in any sense | |
56 | * and will continue to evolve. | |
57 | */ | |
58 | ||
1da177e4 LT |
59 | #include <linux/types.h> |
60 | #include <linux/slab.h> | |
61 | #include <linux/in.h> | |
62 | #include <linux/tty.h> | |
63 | #include <linux/proc_fs.h> | |
64 | #include <linux/spinlock.h> | |
65 | #include <linux/jiffies.h> | |
66 | #include <linux/idr.h> | |
67 | ||
dfd56b8b | 68 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
69 | #include <net/ipv6.h> |
70 | #include <net/ip6_route.h> | |
71 | #endif | |
72 | ||
73 | #include <asm/uaccess.h> | |
74 | #include <asm/page.h> | |
75 | #include <net/sock.h> | |
76 | #include <net/snmp.h> | |
77 | #include <net/sctp/structs.h> | |
78 | #include <net/sctp/constants.h> | |
79 | ||
1da177e4 LT |
80 | #ifdef CONFIG_IP_SCTP_MODULE |
81 | #define SCTP_PROTOSW_FLAG 0 | |
82 | #else /* static! */ | |
83 | #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT | |
84 | #endif | |
85 | ||
1da177e4 LT |
86 | /* |
87 | * Function declarations. | |
88 | */ | |
89 | ||
90 | /* | |
91 | * sctp/protocol.c | |
92 | */ | |
4db67e80 | 93 | extern int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, |
dd0fc66f | 94 | sctp_scope_t, gfp_t gfp, |
3182cd84 | 95 | int flags); |
1da177e4 LT |
96 | extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); |
97 | extern int sctp_register_pf(struct sctp_pf *, sa_family_t); | |
4db67e80 | 98 | extern void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); |
1da177e4 LT |
99 | |
100 | /* | |
101 | * sctp/socket.c | |
102 | */ | |
103 | int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); | |
104 | int sctp_inet_listen(struct socket *sock, int backlog); | |
105 | void sctp_write_space(struct sock *sk); | |
561b1733 | 106 | void sctp_data_ready(struct sock *sk, int len); |
1da177e4 LT |
107 | unsigned int sctp_poll(struct file *file, struct socket *sock, |
108 | poll_table *wait); | |
331c4ee7 | 109 | void sctp_sock_rfree(struct sk_buff *skb); |
914e1c8b VY |
110 | void sctp_copy_sock(struct sock *newsk, struct sock *sk, |
111 | struct sctp_association *asoc); | |
1748376b | 112 | extern struct percpu_counter sctp_sockets_allocated; |
9f7d653b | 113 | extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); |
1da177e4 LT |
114 | |
115 | /* | |
116 | * sctp/primitive.c | |
117 | */ | |
55e26eb9 EB |
118 | int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); |
119 | int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); | |
120 | int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); | |
121 | int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); | |
122 | int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); | |
123 | int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); | |
1da177e4 | 124 | |
1da177e4 LT |
125 | /* |
126 | * sctp/input.c | |
127 | */ | |
128 | int sctp_rcv(struct sk_buff *skb); | |
129 | void sctp_v4_err(struct sk_buff *skb, u32 info); | |
130 | void sctp_hash_established(struct sctp_association *); | |
131 | void sctp_unhash_established(struct sctp_association *); | |
132 | void sctp_hash_endpoint(struct sctp_endpoint *); | |
133 | void sctp_unhash_endpoint(struct sctp_endpoint *); | |
4110cc25 | 134 | struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, |
d1ad1ff2 | 135 | struct sctphdr *, struct sctp_association **, |
1da177e4 | 136 | struct sctp_transport **); |
d1ad1ff2 | 137 | void sctp_err_finish(struct sock *, struct sctp_association *); |
1da177e4 LT |
138 | void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, |
139 | struct sctp_transport *t, __u32 pmtu); | |
ec18d9a2 DM |
140 | void sctp_icmp_redirect(struct sock *, struct sctp_transport *, |
141 | struct sk_buff *); | |
1da177e4 | 142 | void sctp_icmp_proto_unreachable(struct sock *sk, |
1da177e4 LT |
143 | struct sctp_association *asoc, |
144 | struct sctp_transport *t); | |
c4d2444e SS |
145 | void sctp_backlog_migrate(struct sctp_association *assoc, |
146 | struct sock *oldsk, struct sock *newsk); | |
1da177e4 | 147 | |
16164366 AB |
148 | /* |
149 | * sctp/proc.c | |
150 | */ | |
13d782f6 EB |
151 | int sctp_snmp_proc_init(struct net *net); |
152 | void sctp_snmp_proc_exit(struct net *net); | |
153 | int sctp_eps_proc_init(struct net *net); | |
154 | void sctp_eps_proc_exit(struct net *net); | |
155 | int sctp_assocs_proc_init(struct net *net); | |
156 | void sctp_assocs_proc_exit(struct net *net); | |
157 | int sctp_remaddr_proc_init(struct net *net); | |
158 | void sctp_remaddr_proc_exit(struct net *net); | |
16164366 AB |
159 | |
160 | ||
0a5fcb9c | 161 | /* |
162 | * Module global variables | |
163 | */ | |
164 | ||
165 | /* | |
166 | * sctp/protocol.c | |
167 | */ | |
168 | extern struct kmem_cache *sctp_chunk_cachep __read_mostly; | |
169 | extern struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
170 | ||
1da177e4 LT |
171 | /* |
172 | * Section: Macros, externs, and inlines | |
173 | */ | |
174 | ||
1da177e4 LT |
175 | /* spin lock wrappers. */ |
176 | #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) | |
177 | #define sctp_spin_unlock_irqrestore(lock, flags) \ | |
178 | spin_unlock_irqrestore(lock, flags) | |
179 | #define sctp_local_bh_disable() local_bh_disable() | |
180 | #define sctp_local_bh_enable() local_bh_enable() | |
181 | #define sctp_spin_lock(lock) spin_lock(lock) | |
182 | #define sctp_spin_unlock(lock) spin_unlock(lock) | |
183 | #define sctp_write_lock(lock) write_lock(lock) | |
184 | #define sctp_write_unlock(lock) write_unlock(lock) | |
185 | #define sctp_read_lock(lock) read_lock(lock) | |
186 | #define sctp_read_unlock(lock) read_unlock(lock) | |
187 | ||
188 | /* sock lock wrappers. */ | |
189 | #define sctp_lock_sock(sk) lock_sock(sk) | |
190 | #define sctp_release_sock(sk) release_sock(sk) | |
191 | #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) | |
192 | #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) | |
1da177e4 LT |
193 | |
194 | /* SCTP SNMP MIB stats handlers */ | |
b01a2407 EB |
195 | #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) |
196 | #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) | |
197 | #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) | |
198 | #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) | |
1da177e4 | 199 | |
ac0b0462 | 200 | /* sctp mib definitions */ |
fd2c3ef7 | 201 | enum { |
ac0b0462 SS |
202 | SCTP_MIB_NUM = 0, |
203 | SCTP_MIB_CURRESTAB, /* CurrEstab */ | |
204 | SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ | |
205 | SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ | |
206 | SCTP_MIB_ABORTEDS, /* Aborteds */ | |
207 | SCTP_MIB_SHUTDOWNS, /* Shutdowns */ | |
208 | SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ | |
209 | SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ | |
210 | SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ | |
211 | SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ | |
212 | SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ | |
213 | SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ | |
214 | SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ | |
215 | SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ | |
216 | SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ | |
217 | SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ | |
218 | SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ | |
219 | SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ | |
220 | SCTP_MIB_T1_INIT_EXPIREDS, | |
221 | SCTP_MIB_T1_COOKIE_EXPIREDS, | |
222 | SCTP_MIB_T2_SHUTDOWN_EXPIREDS, | |
223 | SCTP_MIB_T3_RTX_EXPIREDS, | |
224 | SCTP_MIB_T4_RTO_EXPIREDS, | |
225 | SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, | |
226 | SCTP_MIB_DELAY_SACK_EXPIREDS, | |
227 | SCTP_MIB_AUTOCLOSE_EXPIREDS, | |
b6157d8e | 228 | SCTP_MIB_T1_RETRANSMITS, |
ac0b0462 SS |
229 | SCTP_MIB_T3_RETRANSMITS, |
230 | SCTP_MIB_PMTUD_RETRANSMITS, | |
231 | SCTP_MIB_FAST_RETRANSMITS, | |
232 | SCTP_MIB_IN_PKT_SOFTIRQ, | |
233 | SCTP_MIB_IN_PKT_BACKLOG, | |
234 | SCTP_MIB_IN_PKT_DISCARDS, | |
235 | SCTP_MIB_IN_DATA_CHUNK_DISCARDS, | |
236 | __SCTP_MIB_MAX | |
237 | }; | |
238 | ||
239 | #define SCTP_MIB_MAX __SCTP_MIB_MAX | |
240 | struct sctp_mib { | |
241 | unsigned long mibs[SCTP_MIB_MAX]; | |
ec733b15 | 242 | }; |
ac0b0462 | 243 | |
196d6759 MB |
244 | /* helper function to track stats about max rto and related transport */ |
245 | static inline void sctp_max_rto(struct sctp_association *asoc, | |
246 | struct sctp_transport *trans) | |
247 | { | |
248 | if (asoc->stats.max_obs_rto < (__u64)trans->rto) { | |
249 | asoc->stats.max_obs_rto = trans->rto; | |
250 | memset(&asoc->stats.obs_rto_ipaddr, 0, | |
251 | sizeof(struct sockaddr_storage)); | |
252 | memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, | |
253 | trans->af_specific->sockaddr_len); | |
254 | } | |
255 | } | |
1da177e4 | 256 | |
1da177e4 LT |
257 | /* |
258 | * Macros for keeping a global reference of object allocations. | |
259 | */ | |
260 | #ifdef CONFIG_SCTP_DBG_OBJCNT | |
261 | ||
262 | extern atomic_t sctp_dbg_objcnt_sock; | |
263 | extern atomic_t sctp_dbg_objcnt_ep; | |
264 | extern atomic_t sctp_dbg_objcnt_assoc; | |
265 | extern atomic_t sctp_dbg_objcnt_transport; | |
266 | extern atomic_t sctp_dbg_objcnt_chunk; | |
267 | extern atomic_t sctp_dbg_objcnt_bind_addr; | |
268 | extern atomic_t sctp_dbg_objcnt_bind_bucket; | |
269 | extern atomic_t sctp_dbg_objcnt_addr; | |
270 | extern atomic_t sctp_dbg_objcnt_ssnmap; | |
271 | extern atomic_t sctp_dbg_objcnt_datamsg; | |
1f485649 | 272 | extern atomic_t sctp_dbg_objcnt_keys; |
1da177e4 LT |
273 | |
274 | /* Macros to atomically increment/decrement objcnt counters. */ | |
275 | #define SCTP_DBG_OBJCNT_INC(name) \ | |
276 | atomic_inc(&sctp_dbg_objcnt_## name) | |
277 | #define SCTP_DBG_OBJCNT_DEC(name) \ | |
278 | atomic_dec(&sctp_dbg_objcnt_## name) | |
279 | #define SCTP_DBG_OBJCNT(name) \ | |
280 | atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) | |
281 | ||
282 | /* Macro to help create new entries in in the global array of | |
283 | * objcnt counters. | |
284 | */ | |
285 | #define SCTP_DBG_OBJCNT_ENTRY(name) \ | |
286 | {.label= #name, .counter= &sctp_dbg_objcnt_## name} | |
287 | ||
13d782f6 EB |
288 | void sctp_dbg_objcnt_init(struct net *); |
289 | void sctp_dbg_objcnt_exit(struct net *); | |
1da177e4 LT |
290 | |
291 | #else | |
292 | ||
293 | #define SCTP_DBG_OBJCNT_INC(name) | |
294 | #define SCTP_DBG_OBJCNT_DEC(name) | |
295 | ||
1f07b62f CW |
296 | static inline void sctp_dbg_objcnt_init(struct net *net) { return; } |
297 | static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } | |
1da177e4 LT |
298 | |
299 | #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ | |
300 | ||
301 | #if defined CONFIG_SYSCTL | |
302 | void sctp_sysctl_register(void); | |
303 | void sctp_sysctl_unregister(void); | |
ebb7e95d EB |
304 | int sctp_sysctl_net_register(struct net *net); |
305 | void sctp_sysctl_net_unregister(struct net *net); | |
1da177e4 LT |
306 | #else |
307 | static inline void sctp_sysctl_register(void) { return; } | |
308 | static inline void sctp_sysctl_unregister(void) { return; } | |
ebb7e95d EB |
309 | static inline int sctp_sysctl_net_register(struct net *net) { return 0; } |
310 | static inline void sctp_sysctl_net_unregister(struct net *net) { return; } | |
1da177e4 LT |
311 | #endif |
312 | ||
313 | /* Size of Supported Address Parameter for 'x' address types. */ | |
314 | #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) | |
315 | ||
dfd56b8b | 316 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 317 | |
270637ab VY |
318 | void sctp_v6_pf_init(void); |
319 | void sctp_v6_pf_exit(void); | |
320 | int sctp_v6_protosw_init(void); | |
321 | void sctp_v6_protosw_exit(void); | |
827bf122 SS |
322 | int sctp_v6_add_protocol(void); |
323 | void sctp_v6_del_protocol(void); | |
1da177e4 LT |
324 | |
325 | #else /* #ifdef defined(CONFIG_IPV6) */ | |
326 | ||
1233823b | 327 | static inline void sctp_v6_pf_init(void) { return; } |
270637ab VY |
328 | static inline void sctp_v6_pf_exit(void) { return; } |
329 | static inline int sctp_v6_protosw_init(void) { return 0; } | |
330 | static inline void sctp_v6_protosw_exit(void) { return; } | |
827bf122 SS |
331 | static inline int sctp_v6_add_protocol(void) { return 0; } |
332 | static inline void sctp_v6_del_protocol(void) { return; } | |
1da177e4 LT |
333 | |
334 | #endif /* #if defined(CONFIG_IPV6) */ | |
335 | ||
1da177e4 LT |
336 | |
337 | /* Map an association to an assoc_id. */ | |
338 | static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) | |
339 | { | |
a02cec21 | 340 | return asoc ? asoc->assoc_id : 0; |
1da177e4 LT |
341 | } |
342 | ||
343 | /* Look up the association by its id. */ | |
344 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); | |
345 | ||
0343c554 | 346 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); |
1da177e4 LT |
347 | |
348 | /* A macro to walk a list of skbs. */ | |
349 | #define sctp_skb_for_each(pos, head, tmp) \ | |
3d09274c | 350 | skb_queue_walk_safe(head, pos, tmp) |
1da177e4 LT |
351 | |
352 | /* A helper to append an entire skb list (list) to another (head). */ | |
353 | static inline void sctp_skb_list_tail(struct sk_buff_head *list, | |
354 | struct sk_buff_head *head) | |
355 | { | |
356 | unsigned long flags; | |
357 | ||
358 | sctp_spin_lock_irqsave(&head->lock, flags); | |
359 | sctp_spin_lock(&list->lock); | |
360 | ||
3d09274c | 361 | skb_queue_splice_tail_init(list, head); |
1da177e4 LT |
362 | |
363 | sctp_spin_unlock(&list->lock); | |
364 | sctp_spin_unlock_irqrestore(&head->lock, flags); | |
365 | } | |
366 | ||
367 | /** | |
368 | * sctp_list_dequeue - remove from the head of the queue | |
369 | * @list: list to dequeue from | |
370 | * | |
371 | * Remove the head of the list. The head item is | |
372 | * returned or %NULL if the list is empty. | |
373 | */ | |
374 | ||
375 | static inline struct list_head *sctp_list_dequeue(struct list_head *list) | |
376 | { | |
377 | struct list_head *result = NULL; | |
378 | ||
379 | if (list->next != list) { | |
380 | result = list->next; | |
381 | list->next = result->next; | |
382 | list->next->prev = list; | |
383 | INIT_LIST_HEAD(result); | |
384 | } | |
385 | return result; | |
386 | } | |
387 | ||
331c4ee7 VY |
388 | /* SCTP version of skb_set_owner_r. We need this one because |
389 | * of the way we have to do receive buffer accounting on bundled | |
390 | * chunks. | |
391 | */ | |
392 | static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
393 | { | |
394 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
395 | ||
d55d87fd | 396 | skb_orphan(skb); |
331c4ee7 VY |
397 | skb->sk = sk; |
398 | skb->destructor = sctp_sock_rfree; | |
399 | atomic_add(event->rmem_len, &sk->sk_rmem_alloc); | |
4d93df0a | 400 | /* |
3ab224be | 401 | * This mimics the behavior of skb_set_owner_r |
4d93df0a NH |
402 | */ |
403 | sk->sk_forward_alloc -= event->rmem_len; | |
331c4ee7 VY |
404 | } |
405 | ||
1da177e4 LT |
406 | /* Tests if the list has one and only one entry. */ |
407 | static inline int sctp_list_single_entry(struct list_head *head) | |
408 | { | |
a02cec21 | 409 | return (head->next != head) && (head->next == head->prev); |
1da177e4 LT |
410 | } |
411 | ||
1da177e4 LT |
412 | /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ |
413 | static inline __s32 sctp_jitter(__u32 rto) | |
414 | { | |
415 | static __u32 sctp_rand; | |
416 | __s32 ret; | |
417 | ||
418 | /* Avoid divide by zero. */ | |
419 | if (!rto) | |
420 | rto = 1; | |
421 | ||
422 | sctp_rand += jiffies; | |
423 | sctp_rand ^= (sctp_rand << 12); | |
424 | sctp_rand ^= (sctp_rand >> 20); | |
425 | ||
426 | /* Choose random number from 0 to rto, then move to -50% ~ +50% | |
427 | * of rto. | |
428 | */ | |
429 | ret = sctp_rand % rto - (rto >> 1); | |
430 | return ret; | |
431 | } | |
432 | ||
433 | /* Break down data chunks at this point. */ | |
f68b2e05 | 434 | static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) |
1da177e4 | 435 | { |
f68b2e05 | 436 | struct sctp_sock *sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
437 | int frag = pmtu; |
438 | ||
439 | frag -= sp->pf->af->net_header_len; | |
440 | frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); | |
441 | ||
f68b2e05 VY |
442 | if (asoc->user_frag) |
443 | frag = min_t(int, frag, asoc->user_frag); | |
1da177e4 LT |
444 | |
445 | frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); | |
446 | ||
447 | return frag; | |
448 | } | |
449 | ||
02f3d4ce | 450 | static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) |
8a479491 VY |
451 | { |
452 | ||
02f3d4ce | 453 | sctp_assoc_sync_pmtu(sk, asoc); |
8a479491 VY |
454 | asoc->pmtu_pending = 0; |
455 | } | |
456 | ||
1da177e4 LT |
457 | /* Walk through a list of TLV parameters. Don't trust the |
458 | * individual parameter lengths and instead depend on | |
459 | * the chunk length to indicate when to stop. Make sure | |
460 | * there is room for a param header too. | |
461 | */ | |
462 | #define sctp_walk_params(pos, chunk, member)\ | |
dd2d1c6f | 463 | _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) |
1da177e4 LT |
464 | |
465 | #define _sctp_walk_params(pos, chunk, end, member)\ | |
466 | for (pos.v = chunk->member;\ | |
dd2d1c6f | 467 | pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
1da177e4 LT |
468 | ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ |
469 | pos.v += WORD_ROUND(ntohs(pos.p->length))) | |
470 | ||
471 | #define sctp_walk_errors(err, chunk_hdr)\ | |
472 | _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) | |
473 | ||
474 | #define _sctp_walk_errors(err, chunk_hdr, end)\ | |
475 | for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ | |
476 | sizeof(sctp_chunkhdr_t));\ | |
dd2d1c6f | 477 | (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
1da177e4 LT |
478 | ntohs(err->length) >= sizeof(sctp_errhdr_t); \ |
479 | err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) | |
480 | ||
481 | #define sctp_walk_fwdtsn(pos, chunk)\ | |
482 | _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) | |
483 | ||
484 | #define _sctp_walk_fwdtsn(pos, chunk, end)\ | |
485 | for (pos = chunk->subh.fwdtsn_hdr->skip;\ | |
486 | (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ | |
487 | pos++) | |
488 | ||
489 | /* Round an int up to the next multiple of 4. */ | |
490 | #define WORD_ROUND(s) (((s)+3)&~3) | |
491 | ||
1da177e4 LT |
492 | /* External references. */ |
493 | ||
494 | extern struct proto sctp_prot; | |
495 | extern struct proto sctpv6_prot; | |
1da177e4 LT |
496 | void sctp_put_port(struct sock *sk); |
497 | ||
498 | extern struct idr sctp_assocs_id; | |
499 | extern spinlock_t sctp_assocs_id_lock; | |
500 | ||
501 | /* Static inline functions. */ | |
502 | ||
503 | /* Convert from an IP version number to an Address Family symbol. */ | |
504 | static inline int ipver2af(__u8 ipver) | |
505 | { | |
506 | switch (ipver) { | |
507 | case 4: | |
508 | return AF_INET; | |
509 | case 6: | |
510 | return AF_INET6; | |
511 | default: | |
512 | return 0; | |
e3cc055c | 513 | } |
1da177e4 LT |
514 | } |
515 | ||
516 | /* Convert from an address parameter type to an address family. */ | |
dbc16db1 | 517 | static inline int param_type2af(__be16 type) |
1da177e4 LT |
518 | { |
519 | switch (type) { | |
520 | case SCTP_PARAM_IPV4_ADDRESS: | |
521 | return AF_INET; | |
522 | case SCTP_PARAM_IPV6_ADDRESS: | |
523 | return AF_INET6; | |
524 | default: | |
525 | return 0; | |
e3cc055c | 526 | } |
1da177e4 LT |
527 | } |
528 | ||
1da177e4 LT |
529 | /* Warning: The following hash functions assume a power of two 'size'. */ |
530 | /* This is the hash function for the SCTP port hash table. */ | |
f1f43763 | 531 | static inline int sctp_phashfn(struct net *net, __u16 lport) |
1da177e4 | 532 | { |
f1f43763 | 533 | return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); |
1da177e4 LT |
534 | } |
535 | ||
536 | /* This is the hash function for the endpoint hash table. */ | |
4cdadcbc | 537 | static inline int sctp_ep_hashfn(struct net *net, __u16 lport) |
1da177e4 | 538 | { |
4cdadcbc | 539 | return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); |
1da177e4 LT |
540 | } |
541 | ||
542 | /* This is the hash function for the association hash table. */ | |
4110cc25 | 543 | static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport) |
1da177e4 | 544 | { |
4110cc25 | 545 | int h = (lport << 16) + rport + net_hash_mix(net); |
1da177e4 | 546 | h ^= h>>8; |
a02cec21 | 547 | return h & (sctp_assoc_hashsize - 1); |
1da177e4 LT |
548 | } |
549 | ||
550 | /* This is the hash function for the association hash table. This is | |
551 | * not used yet, but could be used as a better hash function when | |
552 | * we have a vtag. | |
553 | */ | |
554 | static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) | |
555 | { | |
556 | int h = (lport << 16) + rport; | |
557 | h ^= vtag; | |
a02cec21 | 558 | return h & (sctp_assoc_hashsize - 1); |
1da177e4 LT |
559 | } |
560 | ||
b67bfe0d SL |
561 | #define sctp_for_each_hentry(epb, head) \ |
562 | hlist_for_each_entry(epb, head, node) | |
d970dbf8 | 563 | |
1da177e4 LT |
564 | /* Is a socket of this style? */ |
565 | #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) | |
566 | static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) | |
567 | { | |
568 | return sctp_sk(sk)->type == style; | |
569 | } | |
570 | ||
571 | /* Is the association in this state? */ | |
572 | #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) | |
573 | static inline int __sctp_state(const struct sctp_association *asoc, | |
574 | sctp_state_t state) | |
575 | { | |
576 | return asoc->state == state; | |
577 | } | |
578 | ||
579 | /* Is the socket in this state? */ | |
580 | #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) | |
581 | static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) | |
582 | { | |
583 | return sk->sk_state == state; | |
584 | } | |
585 | ||
586 | /* Map v4-mapped v6 address back to v4 address */ | |
587 | static inline void sctp_v6_map_v4(union sctp_addr *addr) | |
588 | { | |
589 | addr->v4.sin_family = AF_INET; | |
590 | addr->v4.sin_port = addr->v6.sin6_port; | |
591 | addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; | |
592 | } | |
593 | ||
594 | /* Map v4 address to v4-mapped v6 address */ | |
595 | static inline void sctp_v4_map_v6(union sctp_addr *addr) | |
596 | { | |
597 | addr->v6.sin6_family = AF_INET6; | |
598 | addr->v6.sin6_port = addr->v4.sin_port; | |
599 | addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; | |
600 | addr->v6.sin6_addr.s6_addr32[0] = 0; | |
601 | addr->v6.sin6_addr.s6_addr32[1] = 0; | |
602 | addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); | |
603 | } | |
604 | ||
e0268868 ND |
605 | /* The cookie is always 0 since this is how it's used in the |
606 | * pmtu code. | |
607 | */ | |
608 | static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) | |
609 | { | |
d27fc782 | 610 | if (t->dst && !dst_check(t->dst, t->dst_cookie)) { |
e0268868 ND |
611 | dst_release(t->dst); |
612 | t->dst = NULL; | |
613 | } | |
614 | ||
615 | return t->dst; | |
616 | } | |
617 | ||
1da177e4 | 618 | #endif /* __net_sctp_h__ */ |