Commit | Line | Data |
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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 | |
4b2f13a2 JK |
24 | * along with GNU CC; see the file COPYING. If not, see |
25 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
26 | * |
27 | * Please send any bug reports or fixes you make to the | |
28 | * email address(es): | |
91705c61 | 29 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 30 | * |
1da177e4 LT |
31 | * Written or modified by: |
32 | * La Monte H.P. Yarroll <piggy@acm.org> | |
33 | * Xingang Guo <xingang.guo@intel.com> | |
34 | * Jon Grimm <jgrimm@us.ibm.com> | |
35 | * Daisy Chang <daisyc@us.ibm.com> | |
36 | * Sridhar Samudrala <sri@us.ibm.com> | |
37 | * Ardelle Fan <ardelle.fan@intel.com> | |
38 | * Ryan Layer <rmlayer@us.ibm.com> | |
39 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
40 | */ |
41 | ||
42 | #ifndef __net_sctp_h__ | |
43 | #define __net_sctp_h__ | |
44 | ||
45 | /* Header Strategy. | |
46 | * Start getting some control over the header file depencies: | |
47 | * includes | |
48 | * constants | |
49 | * structs | |
50 | * prototypes | |
51 | * macros, externs, and inlines | |
52 | * | |
53 | * Move test_frame specific items out of the kernel headers | |
54 | * and into the test frame headers. This is not perfect in any sense | |
55 | * and will continue to evolve. | |
56 | */ | |
57 | ||
1da177e4 LT |
58 | #include <linux/types.h> |
59 | #include <linux/slab.h> | |
60 | #include <linux/in.h> | |
61 | #include <linux/tty.h> | |
62 | #include <linux/proc_fs.h> | |
63 | #include <linux/spinlock.h> | |
64 | #include <linux/jiffies.h> | |
65 | #include <linux/idr.h> | |
66 | ||
dfd56b8b | 67 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
68 | #include <net/ipv6.h> |
69 | #include <net/ip6_route.h> | |
70 | #endif | |
71 | ||
72 | #include <asm/uaccess.h> | |
73 | #include <asm/page.h> | |
74 | #include <net/sock.h> | |
75 | #include <net/snmp.h> | |
76 | #include <net/sctp/structs.h> | |
77 | #include <net/sctp/constants.h> | |
78 | ||
1da177e4 LT |
79 | #ifdef CONFIG_IP_SCTP_MODULE |
80 | #define SCTP_PROTOSW_FLAG 0 | |
81 | #else /* static! */ | |
82 | #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT | |
83 | #endif | |
84 | ||
1da177e4 LT |
85 | /* |
86 | * Function declarations. | |
87 | */ | |
88 | ||
89 | /* | |
90 | * sctp/protocol.c | |
91 | */ | |
7b584460 JP |
92 | int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, |
93 | sctp_scope_t, gfp_t gfp, int flags); | |
94 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family); | |
95 | int sctp_register_pf(struct sctp_pf *, sa_family_t); | |
96 | void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); | |
1da177e4 LT |
97 | |
98 | /* | |
99 | * sctp/socket.c | |
100 | */ | |
101 | int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); | |
102 | int sctp_inet_listen(struct socket *sock, int backlog); | |
103 | void sctp_write_space(struct sock *sk); | |
676d2369 | 104 | void sctp_data_ready(struct sock *sk); |
1da177e4 LT |
105 | unsigned int sctp_poll(struct file *file, struct socket *sock, |
106 | poll_table *wait); | |
331c4ee7 | 107 | void sctp_sock_rfree(struct sk_buff *skb); |
914e1c8b VY |
108 | void sctp_copy_sock(struct sock *newsk, struct sock *sk, |
109 | struct sctp_association *asoc); | |
1748376b | 110 | extern struct percpu_counter sctp_sockets_allocated; |
7b584460 | 111 | int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); |
2347c80f | 112 | struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); |
1da177e4 LT |
113 | |
114 | /* | |
115 | * sctp/primitive.c | |
116 | */ | |
55e26eb9 EB |
117 | int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); |
118 | int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); | |
119 | int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); | |
120 | int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); | |
121 | int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); | |
122 | int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); | |
1da177e4 | 123 | |
1da177e4 LT |
124 | /* |
125 | * sctp/input.c | |
126 | */ | |
127 | int sctp_rcv(struct sk_buff *skb); | |
128 | void sctp_v4_err(struct sk_buff *skb, u32 info); | |
129 | void sctp_hash_established(struct sctp_association *); | |
130 | void sctp_unhash_established(struct sctp_association *); | |
131 | void sctp_hash_endpoint(struct sctp_endpoint *); | |
132 | void sctp_unhash_endpoint(struct sctp_endpoint *); | |
4110cc25 | 133 | struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, |
d1ad1ff2 | 134 | struct sctphdr *, struct sctp_association **, |
1da177e4 | 135 | struct sctp_transport **); |
d1ad1ff2 | 136 | void sctp_err_finish(struct sock *, struct sctp_association *); |
1da177e4 LT |
137 | void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, |
138 | struct sctp_transport *t, __u32 pmtu); | |
ec18d9a2 DM |
139 | void sctp_icmp_redirect(struct sock *, struct sctp_transport *, |
140 | struct sk_buff *); | |
1da177e4 | 141 | void sctp_icmp_proto_unreachable(struct sock *sk, |
1da177e4 LT |
142 | struct sctp_association *asoc, |
143 | struct sctp_transport *t); | |
c4d2444e SS |
144 | void sctp_backlog_migrate(struct sctp_association *assoc, |
145 | struct sock *oldsk, struct sock *newsk); | |
1da177e4 | 146 | |
16164366 AB |
147 | /* |
148 | * sctp/proc.c | |
149 | */ | |
13d782f6 EB |
150 | int sctp_snmp_proc_init(struct net *net); |
151 | void sctp_snmp_proc_exit(struct net *net); | |
152 | int sctp_eps_proc_init(struct net *net); | |
153 | void sctp_eps_proc_exit(struct net *net); | |
154 | int sctp_assocs_proc_init(struct net *net); | |
155 | void sctp_assocs_proc_exit(struct net *net); | |
156 | int sctp_remaddr_proc_init(struct net *net); | |
157 | void sctp_remaddr_proc_exit(struct net *net); | |
16164366 AB |
158 | |
159 | ||
0a5fcb9c | 160 | /* |
161 | * Module global variables | |
162 | */ | |
163 | ||
164 | /* | |
165 | * sctp/protocol.c | |
166 | */ | |
167 | extern struct kmem_cache *sctp_chunk_cachep __read_mostly; | |
168 | extern struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
169 | ||
1da177e4 LT |
170 | /* |
171 | * Section: Macros, externs, and inlines | |
172 | */ | |
173 | ||
1da177e4 | 174 | /* SCTP SNMP MIB stats handlers */ |
b01a2407 EB |
175 | #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) |
176 | #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) | |
177 | #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) | |
178 | #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) | |
1da177e4 | 179 | |
ac0b0462 | 180 | /* sctp mib definitions */ |
fd2c3ef7 | 181 | enum { |
ac0b0462 SS |
182 | SCTP_MIB_NUM = 0, |
183 | SCTP_MIB_CURRESTAB, /* CurrEstab */ | |
184 | SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ | |
185 | SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ | |
186 | SCTP_MIB_ABORTEDS, /* Aborteds */ | |
187 | SCTP_MIB_SHUTDOWNS, /* Shutdowns */ | |
188 | SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ | |
189 | SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ | |
190 | SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ | |
191 | SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ | |
192 | SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ | |
193 | SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ | |
194 | SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ | |
195 | SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ | |
196 | SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ | |
197 | SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ | |
198 | SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ | |
199 | SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ | |
200 | SCTP_MIB_T1_INIT_EXPIREDS, | |
201 | SCTP_MIB_T1_COOKIE_EXPIREDS, | |
202 | SCTP_MIB_T2_SHUTDOWN_EXPIREDS, | |
203 | SCTP_MIB_T3_RTX_EXPIREDS, | |
204 | SCTP_MIB_T4_RTO_EXPIREDS, | |
205 | SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, | |
206 | SCTP_MIB_DELAY_SACK_EXPIREDS, | |
207 | SCTP_MIB_AUTOCLOSE_EXPIREDS, | |
b6157d8e | 208 | SCTP_MIB_T1_RETRANSMITS, |
ac0b0462 SS |
209 | SCTP_MIB_T3_RETRANSMITS, |
210 | SCTP_MIB_PMTUD_RETRANSMITS, | |
211 | SCTP_MIB_FAST_RETRANSMITS, | |
212 | SCTP_MIB_IN_PKT_SOFTIRQ, | |
213 | SCTP_MIB_IN_PKT_BACKLOG, | |
214 | SCTP_MIB_IN_PKT_DISCARDS, | |
215 | SCTP_MIB_IN_DATA_CHUNK_DISCARDS, | |
216 | __SCTP_MIB_MAX | |
217 | }; | |
218 | ||
219 | #define SCTP_MIB_MAX __SCTP_MIB_MAX | |
220 | struct sctp_mib { | |
221 | unsigned long mibs[SCTP_MIB_MAX]; | |
ec733b15 | 222 | }; |
ac0b0462 | 223 | |
196d6759 MB |
224 | /* helper function to track stats about max rto and related transport */ |
225 | static inline void sctp_max_rto(struct sctp_association *asoc, | |
226 | struct sctp_transport *trans) | |
227 | { | |
228 | if (asoc->stats.max_obs_rto < (__u64)trans->rto) { | |
229 | asoc->stats.max_obs_rto = trans->rto; | |
230 | memset(&asoc->stats.obs_rto_ipaddr, 0, | |
231 | sizeof(struct sockaddr_storage)); | |
232 | memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, | |
233 | trans->af_specific->sockaddr_len); | |
234 | } | |
235 | } | |
1da177e4 | 236 | |
1da177e4 LT |
237 | /* |
238 | * Macros for keeping a global reference of object allocations. | |
239 | */ | |
240 | #ifdef CONFIG_SCTP_DBG_OBJCNT | |
241 | ||
242 | extern atomic_t sctp_dbg_objcnt_sock; | |
243 | extern atomic_t sctp_dbg_objcnt_ep; | |
244 | extern atomic_t sctp_dbg_objcnt_assoc; | |
245 | extern atomic_t sctp_dbg_objcnt_transport; | |
246 | extern atomic_t sctp_dbg_objcnt_chunk; | |
247 | extern atomic_t sctp_dbg_objcnt_bind_addr; | |
248 | extern atomic_t sctp_dbg_objcnt_bind_bucket; | |
249 | extern atomic_t sctp_dbg_objcnt_addr; | |
250 | extern atomic_t sctp_dbg_objcnt_ssnmap; | |
251 | extern atomic_t sctp_dbg_objcnt_datamsg; | |
1f485649 | 252 | extern atomic_t sctp_dbg_objcnt_keys; |
1da177e4 LT |
253 | |
254 | /* Macros to atomically increment/decrement objcnt counters. */ | |
255 | #define SCTP_DBG_OBJCNT_INC(name) \ | |
256 | atomic_inc(&sctp_dbg_objcnt_## name) | |
257 | #define SCTP_DBG_OBJCNT_DEC(name) \ | |
258 | atomic_dec(&sctp_dbg_objcnt_## name) | |
259 | #define SCTP_DBG_OBJCNT(name) \ | |
260 | atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) | |
261 | ||
262 | /* Macro to help create new entries in in the global array of | |
263 | * objcnt counters. | |
264 | */ | |
265 | #define SCTP_DBG_OBJCNT_ENTRY(name) \ | |
266 | {.label= #name, .counter= &sctp_dbg_objcnt_## name} | |
267 | ||
13d782f6 EB |
268 | void sctp_dbg_objcnt_init(struct net *); |
269 | void sctp_dbg_objcnt_exit(struct net *); | |
1da177e4 LT |
270 | |
271 | #else | |
272 | ||
273 | #define SCTP_DBG_OBJCNT_INC(name) | |
274 | #define SCTP_DBG_OBJCNT_DEC(name) | |
275 | ||
1f07b62f CW |
276 | static inline void sctp_dbg_objcnt_init(struct net *net) { return; } |
277 | static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } | |
1da177e4 LT |
278 | |
279 | #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ | |
280 | ||
281 | #if defined CONFIG_SYSCTL | |
282 | void sctp_sysctl_register(void); | |
283 | void sctp_sysctl_unregister(void); | |
ebb7e95d EB |
284 | int sctp_sysctl_net_register(struct net *net); |
285 | void sctp_sysctl_net_unregister(struct net *net); | |
1da177e4 LT |
286 | #else |
287 | static inline void sctp_sysctl_register(void) { return; } | |
288 | static inline void sctp_sysctl_unregister(void) { return; } | |
ebb7e95d EB |
289 | static inline int sctp_sysctl_net_register(struct net *net) { return 0; } |
290 | static inline void sctp_sysctl_net_unregister(struct net *net) { return; } | |
1da177e4 LT |
291 | #endif |
292 | ||
293 | /* Size of Supported Address Parameter for 'x' address types. */ | |
294 | #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) | |
295 | ||
dfd56b8b | 296 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 297 | |
270637ab VY |
298 | void sctp_v6_pf_init(void); |
299 | void sctp_v6_pf_exit(void); | |
300 | int sctp_v6_protosw_init(void); | |
301 | void sctp_v6_protosw_exit(void); | |
827bf122 SS |
302 | int sctp_v6_add_protocol(void); |
303 | void sctp_v6_del_protocol(void); | |
1da177e4 LT |
304 | |
305 | #else /* #ifdef defined(CONFIG_IPV6) */ | |
306 | ||
1233823b | 307 | static inline void sctp_v6_pf_init(void) { return; } |
270637ab VY |
308 | static inline void sctp_v6_pf_exit(void) { return; } |
309 | static inline int sctp_v6_protosw_init(void) { return 0; } | |
310 | static inline void sctp_v6_protosw_exit(void) { return; } | |
827bf122 SS |
311 | static inline int sctp_v6_add_protocol(void) { return 0; } |
312 | static inline void sctp_v6_del_protocol(void) { return; } | |
1da177e4 LT |
313 | |
314 | #endif /* #if defined(CONFIG_IPV6) */ | |
315 | ||
1da177e4 LT |
316 | |
317 | /* Map an association to an assoc_id. */ | |
318 | static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) | |
319 | { | |
a02cec21 | 320 | return asoc ? asoc->assoc_id : 0; |
1da177e4 LT |
321 | } |
322 | ||
323 | /* Look up the association by its id. */ | |
324 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); | |
325 | ||
0343c554 | 326 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); |
1da177e4 LT |
327 | |
328 | /* A macro to walk a list of skbs. */ | |
329 | #define sctp_skb_for_each(pos, head, tmp) \ | |
3d09274c | 330 | skb_queue_walk_safe(head, pos, tmp) |
1da177e4 LT |
331 | |
332 | /* A helper to append an entire skb list (list) to another (head). */ | |
333 | static inline void sctp_skb_list_tail(struct sk_buff_head *list, | |
334 | struct sk_buff_head *head) | |
335 | { | |
336 | unsigned long flags; | |
337 | ||
940287ee | 338 | spin_lock_irqsave(&head->lock, flags); |
3c8e43ba | 339 | spin_lock(&list->lock); |
1da177e4 | 340 | |
3d09274c | 341 | skb_queue_splice_tail_init(list, head); |
1da177e4 | 342 | |
3c8e43ba | 343 | spin_unlock(&list->lock); |
940287ee | 344 | spin_unlock_irqrestore(&head->lock, flags); |
1da177e4 LT |
345 | } |
346 | ||
347 | /** | |
348 | * sctp_list_dequeue - remove from the head of the queue | |
349 | * @list: list to dequeue from | |
350 | * | |
351 | * Remove the head of the list. The head item is | |
352 | * returned or %NULL if the list is empty. | |
353 | */ | |
354 | ||
355 | static inline struct list_head *sctp_list_dequeue(struct list_head *list) | |
356 | { | |
357 | struct list_head *result = NULL; | |
358 | ||
359 | if (list->next != list) { | |
360 | result = list->next; | |
361 | list->next = result->next; | |
362 | list->next->prev = list; | |
363 | INIT_LIST_HEAD(result); | |
364 | } | |
365 | return result; | |
366 | } | |
367 | ||
331c4ee7 VY |
368 | /* SCTP version of skb_set_owner_r. We need this one because |
369 | * of the way we have to do receive buffer accounting on bundled | |
370 | * chunks. | |
371 | */ | |
372 | static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
373 | { | |
374 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
375 | ||
d55d87fd | 376 | skb_orphan(skb); |
331c4ee7 VY |
377 | skb->sk = sk; |
378 | skb->destructor = sctp_sock_rfree; | |
379 | atomic_add(event->rmem_len, &sk->sk_rmem_alloc); | |
4d93df0a | 380 | /* |
3ab224be | 381 | * This mimics the behavior of skb_set_owner_r |
4d93df0a NH |
382 | */ |
383 | sk->sk_forward_alloc -= event->rmem_len; | |
331c4ee7 VY |
384 | } |
385 | ||
1da177e4 LT |
386 | /* Tests if the list has one and only one entry. */ |
387 | static inline int sctp_list_single_entry(struct list_head *head) | |
388 | { | |
a02cec21 | 389 | return (head->next != head) && (head->next == head->prev); |
1da177e4 LT |
390 | } |
391 | ||
1da177e4 | 392 | /* Break down data chunks at this point. */ |
f68b2e05 | 393 | static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) |
1da177e4 | 394 | { |
f68b2e05 | 395 | struct sctp_sock *sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
396 | int frag = pmtu; |
397 | ||
398 | frag -= sp->pf->af->net_header_len; | |
399 | frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); | |
400 | ||
f68b2e05 VY |
401 | if (asoc->user_frag) |
402 | frag = min_t(int, frag, asoc->user_frag); | |
1da177e4 LT |
403 | |
404 | frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); | |
405 | ||
406 | return frag; | |
407 | } | |
408 | ||
02f3d4ce | 409 | static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) |
8a479491 VY |
410 | { |
411 | ||
02f3d4ce | 412 | sctp_assoc_sync_pmtu(sk, asoc); |
8a479491 VY |
413 | asoc->pmtu_pending = 0; |
414 | } | |
415 | ||
1da177e4 LT |
416 | /* Walk through a list of TLV parameters. Don't trust the |
417 | * individual parameter lengths and instead depend on | |
418 | * the chunk length to indicate when to stop. Make sure | |
419 | * there is room for a param header too. | |
420 | */ | |
421 | #define sctp_walk_params(pos, chunk, member)\ | |
dd2d1c6f | 422 | _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) |
1da177e4 LT |
423 | |
424 | #define _sctp_walk_params(pos, chunk, end, member)\ | |
425 | for (pos.v = chunk->member;\ | |
dd2d1c6f | 426 | pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
1da177e4 LT |
427 | ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ |
428 | pos.v += WORD_ROUND(ntohs(pos.p->length))) | |
429 | ||
430 | #define sctp_walk_errors(err, chunk_hdr)\ | |
431 | _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) | |
432 | ||
433 | #define _sctp_walk_errors(err, chunk_hdr, end)\ | |
434 | for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ | |
435 | sizeof(sctp_chunkhdr_t));\ | |
dd2d1c6f | 436 | (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
1da177e4 LT |
437 | ntohs(err->length) >= sizeof(sctp_errhdr_t); \ |
438 | err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) | |
439 | ||
440 | #define sctp_walk_fwdtsn(pos, chunk)\ | |
441 | _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) | |
442 | ||
443 | #define _sctp_walk_fwdtsn(pos, chunk, end)\ | |
444 | for (pos = chunk->subh.fwdtsn_hdr->skip;\ | |
445 | (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ | |
446 | pos++) | |
447 | ||
448 | /* Round an int up to the next multiple of 4. */ | |
449 | #define WORD_ROUND(s) (((s)+3)&~3) | |
450 | ||
1da177e4 LT |
451 | /* External references. */ |
452 | ||
453 | extern struct proto sctp_prot; | |
454 | extern struct proto sctpv6_prot; | |
1da177e4 LT |
455 | void sctp_put_port(struct sock *sk); |
456 | ||
457 | extern struct idr sctp_assocs_id; | |
458 | extern spinlock_t sctp_assocs_id_lock; | |
459 | ||
460 | /* Static inline functions. */ | |
461 | ||
462 | /* Convert from an IP version number to an Address Family symbol. */ | |
463 | static inline int ipver2af(__u8 ipver) | |
464 | { | |
465 | switch (ipver) { | |
466 | case 4: | |
467 | return AF_INET; | |
468 | case 6: | |
469 | return AF_INET6; | |
470 | default: | |
471 | return 0; | |
e3cc055c | 472 | } |
1da177e4 LT |
473 | } |
474 | ||
475 | /* Convert from an address parameter type to an address family. */ | |
dbc16db1 | 476 | static inline int param_type2af(__be16 type) |
1da177e4 LT |
477 | { |
478 | switch (type) { | |
479 | case SCTP_PARAM_IPV4_ADDRESS: | |
480 | return AF_INET; | |
481 | case SCTP_PARAM_IPV6_ADDRESS: | |
482 | return AF_INET6; | |
483 | default: | |
484 | return 0; | |
e3cc055c | 485 | } |
1da177e4 LT |
486 | } |
487 | ||
1da177e4 LT |
488 | /* Warning: The following hash functions assume a power of two 'size'. */ |
489 | /* This is the hash function for the SCTP port hash table. */ | |
f1f43763 | 490 | static inline int sctp_phashfn(struct net *net, __u16 lport) |
1da177e4 | 491 | { |
f1f43763 | 492 | return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); |
1da177e4 LT |
493 | } |
494 | ||
495 | /* This is the hash function for the endpoint hash table. */ | |
4cdadcbc | 496 | static inline int sctp_ep_hashfn(struct net *net, __u16 lport) |
1da177e4 | 497 | { |
4cdadcbc | 498 | return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); |
1da177e4 LT |
499 | } |
500 | ||
501 | /* This is the hash function for the association hash table. */ | |
4110cc25 | 502 | static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport) |
1da177e4 | 503 | { |
4110cc25 | 504 | int h = (lport << 16) + rport + net_hash_mix(net); |
1da177e4 | 505 | h ^= h>>8; |
a02cec21 | 506 | return h & (sctp_assoc_hashsize - 1); |
1da177e4 LT |
507 | } |
508 | ||
509 | /* This is the hash function for the association hash table. This is | |
510 | * not used yet, but could be used as a better hash function when | |
511 | * we have a vtag. | |
512 | */ | |
513 | static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) | |
514 | { | |
515 | int h = (lport << 16) + rport; | |
516 | h ^= vtag; | |
a02cec21 | 517 | return h & (sctp_assoc_hashsize - 1); |
1da177e4 LT |
518 | } |
519 | ||
b67bfe0d SL |
520 | #define sctp_for_each_hentry(epb, head) \ |
521 | hlist_for_each_entry(epb, head, node) | |
d970dbf8 | 522 | |
1da177e4 LT |
523 | /* Is a socket of this style? */ |
524 | #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) | |
525 | static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) | |
526 | { | |
527 | return sctp_sk(sk)->type == style; | |
528 | } | |
529 | ||
530 | /* Is the association in this state? */ | |
531 | #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) | |
532 | static inline int __sctp_state(const struct sctp_association *asoc, | |
533 | sctp_state_t state) | |
534 | { | |
535 | return asoc->state == state; | |
536 | } | |
537 | ||
538 | /* Is the socket in this state? */ | |
539 | #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) | |
540 | static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) | |
541 | { | |
542 | return sk->sk_state == state; | |
543 | } | |
544 | ||
545 | /* Map v4-mapped v6 address back to v4 address */ | |
546 | static inline void sctp_v6_map_v4(union sctp_addr *addr) | |
547 | { | |
548 | addr->v4.sin_family = AF_INET; | |
549 | addr->v4.sin_port = addr->v6.sin6_port; | |
550 | addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; | |
551 | } | |
552 | ||
553 | /* Map v4 address to v4-mapped v6 address */ | |
554 | static inline void sctp_v4_map_v6(union sctp_addr *addr) | |
555 | { | |
556 | addr->v6.sin6_family = AF_INET6; | |
557 | addr->v6.sin6_port = addr->v4.sin_port; | |
558 | addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; | |
559 | addr->v6.sin6_addr.s6_addr32[0] = 0; | |
560 | addr->v6.sin6_addr.s6_addr32[1] = 0; | |
561 | addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); | |
562 | } | |
563 | ||
e0268868 ND |
564 | /* The cookie is always 0 since this is how it's used in the |
565 | * pmtu code. | |
566 | */ | |
567 | static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) | |
568 | { | |
d27fc782 | 569 | if (t->dst && !dst_check(t->dst, t->dst_cookie)) { |
e0268868 ND |
570 | dst_release(t->dst); |
571 | t->dst = NULL; | |
572 | } | |
573 | ||
574 | return t->dst; | |
575 | } | |
576 | ||
1da177e4 | 577 | #endif /* __net_sctp_h__ */ |