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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 | ||
7c0f6ba6 | 72 | #include <linux/uaccess.h> |
1da177e4 LT |
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 | ||
3822a5ff | 85 | /* Round an int up to the next multiple of 4. */ |
e2f036a9 | 86 | #define SCTP_PAD4(s) (((s)+3)&~3) |
3822a5ff | 87 | /* Truncate to the previous multiple of 4. */ |
e2f036a9 | 88 | #define SCTP_TRUNC4(s) ((s)&~3) |
3822a5ff | 89 | |
1da177e4 LT |
90 | /* |
91 | * Function declarations. | |
92 | */ | |
93 | ||
94 | /* | |
95 | * sctp/protocol.c | |
96 | */ | |
7b584460 JP |
97 | int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, |
98 | sctp_scope_t, gfp_t gfp, int flags); | |
99 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family); | |
100 | int sctp_register_pf(struct sctp_pf *, sa_family_t); | |
101 | void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); | |
1da177e4 LT |
102 | |
103 | /* | |
104 | * sctp/socket.c | |
105 | */ | |
106 | int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); | |
107 | int sctp_inet_listen(struct socket *sock, int backlog); | |
108 | void sctp_write_space(struct sock *sk); | |
676d2369 | 109 | void sctp_data_ready(struct sock *sk); |
1da177e4 LT |
110 | unsigned int sctp_poll(struct file *file, struct socket *sock, |
111 | poll_table *wait); | |
331c4ee7 | 112 | void sctp_sock_rfree(struct sk_buff *skb); |
914e1c8b VY |
113 | void sctp_copy_sock(struct sock *newsk, struct sock *sk, |
114 | struct sctp_association *asoc); | |
1748376b | 115 | extern struct percpu_counter sctp_sockets_allocated; |
7b584460 | 116 | int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); |
2347c80f | 117 | struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); |
1da177e4 | 118 | |
626d16f5 XL |
119 | int sctp_transport_walk_start(struct rhashtable_iter *iter); |
120 | void sctp_transport_walk_stop(struct rhashtable_iter *iter); | |
121 | struct sctp_transport *sctp_transport_get_next(struct net *net, | |
122 | struct rhashtable_iter *iter); | |
123 | struct sctp_transport *sctp_transport_get_idx(struct net *net, | |
124 | struct rhashtable_iter *iter, int pos); | |
125 | int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *), | |
126 | struct net *net, | |
127 | const union sctp_addr *laddr, | |
128 | const union sctp_addr *paddr, void *p); | |
129 | int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *), | |
130 | struct net *net, int pos, void *p); | |
131 | int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p); | |
52c52a61 XL |
132 | int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc, |
133 | struct sctp_info *info); | |
134 | ||
1da177e4 LT |
135 | /* |
136 | * sctp/primitive.c | |
137 | */ | |
55e26eb9 EB |
138 | int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); |
139 | int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); | |
140 | int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); | |
141 | int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); | |
142 | int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); | |
143 | int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); | |
7a090b04 XL |
144 | int sctp_primitive_RECONF(struct net *net, struct sctp_association *asoc, |
145 | void *arg); | |
1da177e4 | 146 | |
1da177e4 LT |
147 | /* |
148 | * sctp/input.c | |
149 | */ | |
150 | int sctp_rcv(struct sk_buff *skb); | |
151 | void sctp_v4_err(struct sk_buff *skb, u32 info); | |
1da177e4 LT |
152 | void sctp_hash_endpoint(struct sctp_endpoint *); |
153 | void sctp_unhash_endpoint(struct sctp_endpoint *); | |
4110cc25 | 154 | struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, |
d1ad1ff2 | 155 | struct sctphdr *, struct sctp_association **, |
1da177e4 | 156 | struct sctp_transport **); |
dae399d7 | 157 | void sctp_err_finish(struct sock *, struct sctp_transport *); |
1da177e4 LT |
158 | void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, |
159 | struct sctp_transport *t, __u32 pmtu); | |
ec18d9a2 DM |
160 | void sctp_icmp_redirect(struct sock *, struct sctp_transport *, |
161 | struct sk_buff *); | |
1da177e4 | 162 | void sctp_icmp_proto_unreachable(struct sock *sk, |
1da177e4 LT |
163 | struct sctp_association *asoc, |
164 | struct sctp_transport *t); | |
c4d2444e SS |
165 | void sctp_backlog_migrate(struct sctp_association *assoc, |
166 | struct sock *oldsk, struct sock *newsk); | |
d6c0256a XL |
167 | int sctp_transport_hashtable_init(void); |
168 | void sctp_transport_hashtable_destroy(void); | |
7fda702f | 169 | int sctp_hash_transport(struct sctp_transport *t); |
d6c0256a XL |
170 | void sctp_unhash_transport(struct sctp_transport *t); |
171 | struct sctp_transport *sctp_addrs_lookup_transport( | |
172 | struct net *net, | |
173 | const union sctp_addr *laddr, | |
174 | const union sctp_addr *paddr); | |
175 | struct sctp_transport *sctp_epaddr_lookup_transport( | |
176 | const struct sctp_endpoint *ep, | |
177 | const union sctp_addr *paddr); | |
1da177e4 | 178 | |
16164366 AB |
179 | /* |
180 | * sctp/proc.c | |
181 | */ | |
13d782f6 EB |
182 | int sctp_snmp_proc_init(struct net *net); |
183 | void sctp_snmp_proc_exit(struct net *net); | |
184 | int sctp_eps_proc_init(struct net *net); | |
185 | void sctp_eps_proc_exit(struct net *net); | |
186 | int sctp_assocs_proc_init(struct net *net); | |
187 | void sctp_assocs_proc_exit(struct net *net); | |
188 | int sctp_remaddr_proc_init(struct net *net); | |
189 | void sctp_remaddr_proc_exit(struct net *net); | |
16164366 | 190 | |
90017acc MRL |
191 | /* |
192 | * sctp/offload.c | |
193 | */ | |
194 | int sctp_offload_init(void); | |
16164366 | 195 | |
7f9d68ac XL |
196 | /* |
197 | * sctp/stream.c | |
198 | */ | |
199 | int sctp_send_reset_streams(struct sctp_association *asoc, | |
200 | struct sctp_reset_streams *params); | |
201 | ||
0a5fcb9c | 202 | /* |
203 | * Module global variables | |
204 | */ | |
205 | ||
206 | /* | |
207 | * sctp/protocol.c | |
208 | */ | |
209 | extern struct kmem_cache *sctp_chunk_cachep __read_mostly; | |
210 | extern struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
7e3ea6d5 YX |
211 | extern long sysctl_sctp_mem[3]; |
212 | extern int sysctl_sctp_rmem[3]; | |
213 | extern int sysctl_sctp_wmem[3]; | |
0a5fcb9c | 214 | |
1da177e4 LT |
215 | /* |
216 | * Section: Macros, externs, and inlines | |
217 | */ | |
218 | ||
1da177e4 | 219 | /* SCTP SNMP MIB stats handlers */ |
13415e46 ED |
220 | #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) |
221 | #define __SCTP_INC_STATS(net, field) __SNMP_INC_STATS((net)->sctp.sctp_statistics, field) | |
222 | #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) | |
1da177e4 | 223 | |
ac0b0462 | 224 | /* sctp mib definitions */ |
fd2c3ef7 | 225 | enum { |
ac0b0462 SS |
226 | SCTP_MIB_NUM = 0, |
227 | SCTP_MIB_CURRESTAB, /* CurrEstab */ | |
228 | SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ | |
229 | SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ | |
230 | SCTP_MIB_ABORTEDS, /* Aborteds */ | |
231 | SCTP_MIB_SHUTDOWNS, /* Shutdowns */ | |
232 | SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ | |
233 | SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ | |
234 | SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ | |
235 | SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ | |
236 | SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ | |
237 | SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ | |
238 | SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ | |
239 | SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ | |
240 | SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ | |
241 | SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ | |
242 | SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ | |
243 | SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ | |
244 | SCTP_MIB_T1_INIT_EXPIREDS, | |
245 | SCTP_MIB_T1_COOKIE_EXPIREDS, | |
246 | SCTP_MIB_T2_SHUTDOWN_EXPIREDS, | |
247 | SCTP_MIB_T3_RTX_EXPIREDS, | |
248 | SCTP_MIB_T4_RTO_EXPIREDS, | |
249 | SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, | |
250 | SCTP_MIB_DELAY_SACK_EXPIREDS, | |
251 | SCTP_MIB_AUTOCLOSE_EXPIREDS, | |
b6157d8e | 252 | SCTP_MIB_T1_RETRANSMITS, |
ac0b0462 SS |
253 | SCTP_MIB_T3_RETRANSMITS, |
254 | SCTP_MIB_PMTUD_RETRANSMITS, | |
255 | SCTP_MIB_FAST_RETRANSMITS, | |
256 | SCTP_MIB_IN_PKT_SOFTIRQ, | |
257 | SCTP_MIB_IN_PKT_BACKLOG, | |
258 | SCTP_MIB_IN_PKT_DISCARDS, | |
259 | SCTP_MIB_IN_DATA_CHUNK_DISCARDS, | |
260 | __SCTP_MIB_MAX | |
261 | }; | |
262 | ||
263 | #define SCTP_MIB_MAX __SCTP_MIB_MAX | |
264 | struct sctp_mib { | |
265 | unsigned long mibs[SCTP_MIB_MAX]; | |
ec733b15 | 266 | }; |
ac0b0462 | 267 | |
196d6759 MB |
268 | /* helper function to track stats about max rto and related transport */ |
269 | static inline void sctp_max_rto(struct sctp_association *asoc, | |
270 | struct sctp_transport *trans) | |
271 | { | |
272 | if (asoc->stats.max_obs_rto < (__u64)trans->rto) { | |
273 | asoc->stats.max_obs_rto = trans->rto; | |
274 | memset(&asoc->stats.obs_rto_ipaddr, 0, | |
275 | sizeof(struct sockaddr_storage)); | |
276 | memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, | |
277 | trans->af_specific->sockaddr_len); | |
278 | } | |
279 | } | |
1da177e4 | 280 | |
1da177e4 LT |
281 | /* |
282 | * Macros for keeping a global reference of object allocations. | |
283 | */ | |
284 | #ifdef CONFIG_SCTP_DBG_OBJCNT | |
285 | ||
286 | extern atomic_t sctp_dbg_objcnt_sock; | |
287 | extern atomic_t sctp_dbg_objcnt_ep; | |
288 | extern atomic_t sctp_dbg_objcnt_assoc; | |
289 | extern atomic_t sctp_dbg_objcnt_transport; | |
290 | extern atomic_t sctp_dbg_objcnt_chunk; | |
291 | extern atomic_t sctp_dbg_objcnt_bind_addr; | |
292 | extern atomic_t sctp_dbg_objcnt_bind_bucket; | |
293 | extern atomic_t sctp_dbg_objcnt_addr; | |
1da177e4 | 294 | extern atomic_t sctp_dbg_objcnt_datamsg; |
1f485649 | 295 | extern atomic_t sctp_dbg_objcnt_keys; |
1da177e4 LT |
296 | |
297 | /* Macros to atomically increment/decrement objcnt counters. */ | |
298 | #define SCTP_DBG_OBJCNT_INC(name) \ | |
299 | atomic_inc(&sctp_dbg_objcnt_## name) | |
300 | #define SCTP_DBG_OBJCNT_DEC(name) \ | |
301 | atomic_dec(&sctp_dbg_objcnt_## name) | |
302 | #define SCTP_DBG_OBJCNT(name) \ | |
303 | atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) | |
304 | ||
305 | /* Macro to help create new entries in in the global array of | |
306 | * objcnt counters. | |
307 | */ | |
308 | #define SCTP_DBG_OBJCNT_ENTRY(name) \ | |
309 | {.label= #name, .counter= &sctp_dbg_objcnt_## name} | |
310 | ||
13d782f6 EB |
311 | void sctp_dbg_objcnt_init(struct net *); |
312 | void sctp_dbg_objcnt_exit(struct net *); | |
1da177e4 LT |
313 | |
314 | #else | |
315 | ||
316 | #define SCTP_DBG_OBJCNT_INC(name) | |
317 | #define SCTP_DBG_OBJCNT_DEC(name) | |
318 | ||
1f07b62f CW |
319 | static inline void sctp_dbg_objcnt_init(struct net *net) { return; } |
320 | static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } | |
1da177e4 LT |
321 | |
322 | #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ | |
323 | ||
324 | #if defined CONFIG_SYSCTL | |
325 | void sctp_sysctl_register(void); | |
326 | void sctp_sysctl_unregister(void); | |
ebb7e95d EB |
327 | int sctp_sysctl_net_register(struct net *net); |
328 | void sctp_sysctl_net_unregister(struct net *net); | |
1da177e4 LT |
329 | #else |
330 | static inline void sctp_sysctl_register(void) { return; } | |
331 | static inline void sctp_sysctl_unregister(void) { return; } | |
ebb7e95d EB |
332 | static inline int sctp_sysctl_net_register(struct net *net) { return 0; } |
333 | static inline void sctp_sysctl_net_unregister(struct net *net) { return; } | |
1da177e4 LT |
334 | #endif |
335 | ||
336 | /* Size of Supported Address Parameter for 'x' address types. */ | |
337 | #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) | |
338 | ||
dfd56b8b | 339 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 340 | |
270637ab VY |
341 | void sctp_v6_pf_init(void); |
342 | void sctp_v6_pf_exit(void); | |
343 | int sctp_v6_protosw_init(void); | |
344 | void sctp_v6_protosw_exit(void); | |
827bf122 SS |
345 | int sctp_v6_add_protocol(void); |
346 | void sctp_v6_del_protocol(void); | |
1da177e4 LT |
347 | |
348 | #else /* #ifdef defined(CONFIG_IPV6) */ | |
349 | ||
1233823b | 350 | static inline void sctp_v6_pf_init(void) { return; } |
270637ab VY |
351 | static inline void sctp_v6_pf_exit(void) { return; } |
352 | static inline int sctp_v6_protosw_init(void) { return 0; } | |
353 | static inline void sctp_v6_protosw_exit(void) { return; } | |
827bf122 SS |
354 | static inline int sctp_v6_add_protocol(void) { return 0; } |
355 | static inline void sctp_v6_del_protocol(void) { return; } | |
1da177e4 LT |
356 | |
357 | #endif /* #if defined(CONFIG_IPV6) */ | |
358 | ||
1da177e4 LT |
359 | |
360 | /* Map an association to an assoc_id. */ | |
361 | static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) | |
362 | { | |
a02cec21 | 363 | return asoc ? asoc->assoc_id : 0; |
1da177e4 LT |
364 | } |
365 | ||
38ab1fa9 DB |
366 | static inline enum sctp_sstat_state |
367 | sctp_assoc_to_state(const struct sctp_association *asoc) | |
368 | { | |
369 | /* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we | |
370 | * got rid of it in kernel space. Therefore SCTP_CLOSED et al | |
371 | * start at =1 in user space, but actually as =0 in kernel space. | |
372 | * Now that we can not break user space and SCTP_EMPTY is exposed | |
373 | * there, we need to fix it up with an ugly offset not to break | |
374 | * applications. :( | |
375 | */ | |
376 | return asoc->state + 1; | |
377 | } | |
378 | ||
1da177e4 LT |
379 | /* Look up the association by its id. */ |
380 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); | |
381 | ||
0343c554 | 382 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); |
1da177e4 LT |
383 | |
384 | /* A macro to walk a list of skbs. */ | |
385 | #define sctp_skb_for_each(pos, head, tmp) \ | |
3d09274c | 386 | skb_queue_walk_safe(head, pos, tmp) |
1da177e4 | 387 | |
1da177e4 LT |
388 | /** |
389 | * sctp_list_dequeue - remove from the head of the queue | |
390 | * @list: list to dequeue from | |
391 | * | |
392 | * Remove the head of the list. The head item is | |
393 | * returned or %NULL if the list is empty. | |
394 | */ | |
395 | ||
396 | static inline struct list_head *sctp_list_dequeue(struct list_head *list) | |
397 | { | |
398 | struct list_head *result = NULL; | |
399 | ||
eb8e9771 | 400 | if (!list_empty(list)) { |
1da177e4 | 401 | result = list->next; |
eb8e9771 | 402 | list_del_init(result); |
1da177e4 LT |
403 | } |
404 | return result; | |
405 | } | |
406 | ||
331c4ee7 VY |
407 | /* SCTP version of skb_set_owner_r. We need this one because |
408 | * of the way we have to do receive buffer accounting on bundled | |
409 | * chunks. | |
410 | */ | |
411 | static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
412 | { | |
413 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
414 | ||
d55d87fd | 415 | skb_orphan(skb); |
331c4ee7 VY |
416 | skb->sk = sk; |
417 | skb->destructor = sctp_sock_rfree; | |
418 | atomic_add(event->rmem_len, &sk->sk_rmem_alloc); | |
4d93df0a | 419 | /* |
3ab224be | 420 | * This mimics the behavior of skb_set_owner_r |
4d93df0a NH |
421 | */ |
422 | sk->sk_forward_alloc -= event->rmem_len; | |
331c4ee7 VY |
423 | } |
424 | ||
1da177e4 LT |
425 | /* Tests if the list has one and only one entry. */ |
426 | static inline int sctp_list_single_entry(struct list_head *head) | |
427 | { | |
a02cec21 | 428 | return (head->next != head) && (head->next == head->prev); |
1da177e4 LT |
429 | } |
430 | ||
1da177e4 | 431 | /* Break down data chunks at this point. */ |
f68b2e05 | 432 | static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) |
1da177e4 | 433 | { |
f68b2e05 | 434 | struct sctp_sock *sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
435 | int frag = pmtu; |
436 | ||
437 | frag -= sp->pf->af->net_header_len; | |
438 | frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); | |
439 | ||
f68b2e05 VY |
440 | if (asoc->user_frag) |
441 | frag = min_t(int, frag, asoc->user_frag); | |
1da177e4 | 442 | |
e2f036a9 | 443 | frag = SCTP_TRUNC4(min_t(int, frag, SCTP_MAX_CHUNK_LEN)); |
1da177e4 LT |
444 | |
445 | return frag; | |
446 | } | |
447 | ||
02f3d4ce | 448 | static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) |
8a479491 VY |
449 | { |
450 | ||
02f3d4ce | 451 | sctp_assoc_sync_pmtu(sk, asoc); |
8a479491 VY |
452 | asoc->pmtu_pending = 0; |
453 | } | |
454 | ||
b69040d8 DB |
455 | static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) |
456 | { | |
457 | return !list_empty(&chunk->list); | |
458 | } | |
459 | ||
1da177e4 LT |
460 | /* Walk through a list of TLV parameters. Don't trust the |
461 | * individual parameter lengths and instead depend on | |
462 | * the chunk length to indicate when to stop. Make sure | |
463 | * there is room for a param header too. | |
464 | */ | |
465 | #define sctp_walk_params(pos, chunk, member)\ | |
dd2d1c6f | 466 | _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) |
1da177e4 LT |
467 | |
468 | #define _sctp_walk_params(pos, chunk, end, member)\ | |
469 | for (pos.v = chunk->member;\ | |
dd2d1c6f | 470 | pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
1da177e4 | 471 | ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ |
e2f036a9 | 472 | pos.v += SCTP_PAD4(ntohs(pos.p->length))) |
1da177e4 LT |
473 | |
474 | #define sctp_walk_errors(err, chunk_hdr)\ | |
475 | _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) | |
476 | ||
477 | #define _sctp_walk_errors(err, chunk_hdr, end)\ | |
478 | for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ | |
479 | sizeof(sctp_chunkhdr_t));\ | |
dd2d1c6f | 480 | (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
1da177e4 | 481 | ntohs(err->length) >= sizeof(sctp_errhdr_t); \ |
e2f036a9 | 482 | err = (sctp_errhdr_t *)((void *)err + SCTP_PAD4(ntohs(err->length)))) |
1da177e4 LT |
483 | |
484 | #define sctp_walk_fwdtsn(pos, chunk)\ | |
485 | _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) | |
486 | ||
487 | #define _sctp_walk_fwdtsn(pos, chunk, end)\ | |
488 | for (pos = chunk->subh.fwdtsn_hdr->skip;\ | |
489 | (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ | |
490 | pos++) | |
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 | ||
b67bfe0d SL |
542 | #define sctp_for_each_hentry(epb, head) \ |
543 | hlist_for_each_entry(epb, head, node) | |
d970dbf8 | 544 | |
1da177e4 LT |
545 | /* Is a socket of this style? */ |
546 | #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) | |
547 | static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) | |
548 | { | |
549 | return sctp_sk(sk)->type == style; | |
550 | } | |
551 | ||
552 | /* Is the association in this state? */ | |
553 | #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) | |
554 | static inline int __sctp_state(const struct sctp_association *asoc, | |
555 | sctp_state_t state) | |
556 | { | |
557 | return asoc->state == state; | |
558 | } | |
559 | ||
560 | /* Is the socket in this state? */ | |
561 | #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) | |
562 | static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) | |
563 | { | |
564 | return sk->sk_state == state; | |
565 | } | |
566 | ||
567 | /* Map v4-mapped v6 address back to v4 address */ | |
568 | static inline void sctp_v6_map_v4(union sctp_addr *addr) | |
569 | { | |
570 | addr->v4.sin_family = AF_INET; | |
571 | addr->v4.sin_port = addr->v6.sin6_port; | |
572 | addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; | |
573 | } | |
574 | ||
575 | /* Map v4 address to v4-mapped v6 address */ | |
576 | static inline void sctp_v4_map_v6(union sctp_addr *addr) | |
577 | { | |
9302d7bb JG |
578 | __be16 port; |
579 | ||
580 | port = addr->v4.sin_port; | |
581 | addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; | |
582 | addr->v6.sin6_port = port; | |
1da177e4 | 583 | addr->v6.sin6_family = AF_INET6; |
299ee123 JG |
584 | addr->v6.sin6_flowinfo = 0; |
585 | addr->v6.sin6_scope_id = 0; | |
1da177e4 LT |
586 | addr->v6.sin6_addr.s6_addr32[0] = 0; |
587 | addr->v6.sin6_addr.s6_addr32[1] = 0; | |
588 | addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); | |
589 | } | |
590 | ||
e0268868 ND |
591 | /* The cookie is always 0 since this is how it's used in the |
592 | * pmtu code. | |
593 | */ | |
594 | static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) | |
595 | { | |
d27fc782 | 596 | if (t->dst && !dst_check(t->dst, t->dst_cookie)) { |
e0268868 ND |
597 | dst_release(t->dst); |
598 | t->dst = NULL; | |
599 | } | |
600 | ||
601 | return t->dst; | |
602 | } | |
603 | ||
1da177e4 | 604 | #endif /* __net_sctp_h__ */ |