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Commit | Line | Data |
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8f03dea5 MJ |
1 | /* L3/L4 protocol support for nf_conntrack. */ |
2 | ||
3 | /* (C) 1999-2001 Paul `Rusty' Russell | |
4 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> | |
5 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> | |
f229f6ce | 6 | * (C) 2006-2012 Patrick McHardy <kaber@trash.net> |
8f03dea5 MJ |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
14 | #include <linux/netfilter.h> | |
15 | #include <linux/module.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
d62f9ed4 | 17 | #include <linux/mutex.h> |
8f03dea5 MJ |
18 | #include <linux/vmalloc.h> |
19 | #include <linux/stddef.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/percpu.h> | |
8f03dea5 MJ |
22 | #include <linux/notifier.h> |
23 | #include <linux/kernel.h> | |
24 | #include <linux/netdevice.h> | |
25 | ||
26 | #include <net/netfilter/nf_conntrack.h> | |
27 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 28 | #include <net/netfilter/nf_conntrack_l4proto.h> |
8f03dea5 MJ |
29 | #include <net/netfilter/nf_conntrack_core.h> |
30 | ||
0906a372 AB |
31 | static struct nf_conntrack_l4proto __rcu **nf_ct_protos[PF_MAX] __read_mostly; |
32 | struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX] __read_mostly; | |
13b18339 | 33 | EXPORT_SYMBOL_GPL(nf_ct_l3protos); |
8f03dea5 | 34 | |
b19caa0c | 35 | static DEFINE_MUTEX(nf_ct_proto_mutex); |
d62f9ed4 | 36 | |
b19caa0c | 37 | #ifdef CONFIG_SYSCTL |
d62f9ed4 | 38 | static int |
2c352f44 G |
39 | nf_ct_register_sysctl(struct net *net, |
40 | struct ctl_table_header **header, | |
41 | const char *path, | |
fa34fff5 | 42 | struct ctl_table *table) |
d62f9ed4 PM |
43 | { |
44 | if (*header == NULL) { | |
2c352f44 | 45 | *header = register_net_sysctl(net, path, table); |
d62f9ed4 PM |
46 | if (*header == NULL) |
47 | return -ENOMEM; | |
48 | } | |
2c352f44 | 49 | |
d62f9ed4 PM |
50 | return 0; |
51 | } | |
52 | ||
53 | static void | |
54 | nf_ct_unregister_sysctl(struct ctl_table_header **header, | |
2c352f44 | 55 | struct ctl_table **table, |
fa34fff5 | 56 | unsigned int users) |
d62f9ed4 | 57 | { |
fa34fff5 | 58 | if (users > 0) |
d62f9ed4 | 59 | return; |
b3fd3ffe | 60 | |
5dd3df10 | 61 | unregister_net_sysctl_table(*header); |
2c352f44 | 62 | kfree(*table); |
d62f9ed4 | 63 | *header = NULL; |
2c352f44 | 64 | *table = NULL; |
d62f9ed4 PM |
65 | } |
66 | #endif | |
67 | ||
605dcad6 MJ |
68 | struct nf_conntrack_l4proto * |
69 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto) | |
8f03dea5 MJ |
70 | { |
71 | if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL)) | |
605dcad6 | 72 | return &nf_conntrack_l4proto_generic; |
8f03dea5 | 73 | |
923f4902 | 74 | return rcu_dereference(nf_ct_protos[l3proto][l4proto]); |
8f03dea5 | 75 | } |
13b18339 | 76 | EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find); |
8f03dea5 MJ |
77 | |
78 | /* this is guaranteed to always return a valid protocol helper, since | |
79 | * it falls back to generic_protocol */ | |
8f03dea5 MJ |
80 | struct nf_conntrack_l3proto * |
81 | nf_ct_l3proto_find_get(u_int16_t l3proto) | |
82 | { | |
83 | struct nf_conntrack_l3proto *p; | |
84 | ||
923f4902 | 85 | rcu_read_lock(); |
8f03dea5 MJ |
86 | p = __nf_ct_l3proto_find(l3proto); |
87 | if (!try_module_get(p->me)) | |
605dcad6 | 88 | p = &nf_conntrack_l3proto_generic; |
923f4902 | 89 | rcu_read_unlock(); |
8f03dea5 MJ |
90 | |
91 | return p; | |
92 | } | |
13b18339 | 93 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get); |
8f03dea5 | 94 | |
8f03dea5 MJ |
95 | int |
96 | nf_ct_l3proto_try_module_get(unsigned short l3proto) | |
97 | { | |
98 | int ret; | |
99 | struct nf_conntrack_l3proto *p; | |
100 | ||
101 | retry: p = nf_ct_l3proto_find_get(l3proto); | |
605dcad6 | 102 | if (p == &nf_conntrack_l3proto_generic) { |
8f03dea5 MJ |
103 | ret = request_module("nf_conntrack-%d", l3proto); |
104 | if (!ret) | |
105 | goto retry; | |
106 | ||
107 | return -EPROTOTYPE; | |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
13b18339 | 112 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get); |
8f03dea5 MJ |
113 | |
114 | void nf_ct_l3proto_module_put(unsigned short l3proto) | |
115 | { | |
116 | struct nf_conntrack_l3proto *p; | |
117 | ||
3b254c54 PM |
118 | /* rcu_read_lock not necessary since the caller holds a reference, but |
119 | * taken anyways to avoid lockdep warnings in __nf_ct_l3proto_find() | |
120 | */ | |
121 | rcu_read_lock(); | |
8f03dea5 | 122 | p = __nf_ct_l3proto_find(l3proto); |
8f03dea5 | 123 | module_put(p->me); |
3b254c54 | 124 | rcu_read_unlock(); |
8f03dea5 | 125 | } |
13b18339 | 126 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put); |
8f03dea5 | 127 | |
ecb2421b FW |
128 | int nf_ct_netns_get(struct net *net, u8 nfproto) |
129 | { | |
0c66dc1e FW |
130 | const struct nf_conntrack_l3proto *l3proto; |
131 | int ret; | |
132 | ||
133 | might_sleep(); | |
134 | ||
135 | ret = nf_ct_l3proto_try_module_get(nfproto); | |
136 | if (ret < 0) | |
137 | return ret; | |
138 | ||
139 | /* we already have a reference, can't fail */ | |
140 | rcu_read_lock(); | |
141 | l3proto = __nf_ct_l3proto_find(nfproto); | |
142 | rcu_read_unlock(); | |
143 | ||
144 | if (!l3proto->net_ns_get) | |
145 | return 0; | |
146 | ||
147 | ret = l3proto->net_ns_get(net); | |
148 | if (ret < 0) | |
149 | nf_ct_l3proto_module_put(nfproto); | |
150 | ||
151 | return ret; | |
ecb2421b FW |
152 | } |
153 | EXPORT_SYMBOL_GPL(nf_ct_netns_get); | |
154 | ||
155 | void nf_ct_netns_put(struct net *net, u8 nfproto) | |
156 | { | |
0c66dc1e FW |
157 | const struct nf_conntrack_l3proto *l3proto; |
158 | ||
159 | might_sleep(); | |
160 | ||
161 | /* same as nf_conntrack_netns_get(), reference assumed */ | |
162 | rcu_read_lock(); | |
163 | l3proto = __nf_ct_l3proto_find(nfproto); | |
164 | rcu_read_unlock(); | |
165 | ||
166 | if (WARN_ON(!l3proto)) | |
167 | return; | |
168 | ||
169 | if (l3proto->net_ns_put) | |
170 | l3proto->net_ns_put(net); | |
171 | ||
ecb2421b FW |
172 | nf_ct_l3proto_module_put(nfproto); |
173 | } | |
174 | EXPORT_SYMBOL_GPL(nf_ct_netns_put); | |
175 | ||
c1ebd7df PNA |
176 | struct nf_conntrack_l4proto * |
177 | nf_ct_l4proto_find_get(u_int16_t l3num, u_int8_t l4num) | |
178 | { | |
179 | struct nf_conntrack_l4proto *p; | |
180 | ||
181 | rcu_read_lock(); | |
182 | p = __nf_ct_l4proto_find(l3num, l4num); | |
183 | if (!try_module_get(p->me)) | |
184 | p = &nf_conntrack_l4proto_generic; | |
185 | rcu_read_unlock(); | |
186 | ||
187 | return p; | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get); | |
190 | ||
191 | void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p) | |
192 | { | |
193 | module_put(p->me); | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_put); | |
196 | ||
8f03dea5 MJ |
197 | static int kill_l3proto(struct nf_conn *i, void *data) |
198 | { | |
5e8fbe2a | 199 | return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto; |
8f03dea5 MJ |
200 | } |
201 | ||
605dcad6 | 202 | static int kill_l4proto(struct nf_conn *i, void *data) |
8f03dea5 | 203 | { |
605dcad6 MJ |
204 | struct nf_conntrack_l4proto *l4proto; |
205 | l4proto = (struct nf_conntrack_l4proto *)data; | |
5e8fbe2a PM |
206 | return nf_ct_protonum(i) == l4proto->l4proto && |
207 | nf_ct_l3num(i) == l4proto->l3proto; | |
8f03dea5 MJ |
208 | } |
209 | ||
6330750d | 210 | int nf_ct_l3proto_register(struct nf_conntrack_l3proto *proto) |
8f03dea5 MJ |
211 | { |
212 | int ret = 0; | |
0e60ebe0 | 213 | struct nf_conntrack_l3proto *old; |
8f03dea5 | 214 | |
0661cca9 PM |
215 | if (proto->l3proto >= AF_MAX) |
216 | return -EBUSY; | |
ae5718fb | 217 | |
d0dba725 HE |
218 | if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size) |
219 | return -EINVAL; | |
220 | ||
b19caa0c | 221 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
222 | old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
223 | lockdep_is_held(&nf_ct_proto_mutex)); | |
224 | if (old != &nf_conntrack_l3proto_generic) { | |
8f03dea5 | 225 | ret = -EBUSY; |
ae5718fb | 226 | goto out_unlock; |
8f03dea5 | 227 | } |
d62f9ed4 | 228 | |
d0dba725 HE |
229 | if (proto->nlattr_tuple_size) |
230 | proto->nla_size = 3 * proto->nlattr_tuple_size(); | |
231 | ||
0661cca9 | 232 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); |
8f03dea5 | 233 | |
ae5718fb | 234 | out_unlock: |
b19caa0c | 235 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 236 | return ret; |
524a53e5 | 237 | |
8f03dea5 | 238 | } |
6330750d | 239 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_register); |
8f03dea5 | 240 | |
481fa373 FW |
241 | #ifdef CONFIG_SYSCTL |
242 | extern unsigned int nf_conntrack_default_on; | |
243 | ||
6330750d | 244 | int nf_ct_l3proto_pernet_register(struct net *net, |
524a53e5 | 245 | struct nf_conntrack_l3proto *proto) |
8f03dea5 | 246 | { |
481fa373 FW |
247 | if (nf_conntrack_default_on == 0) |
248 | return 0; | |
249 | ||
250 | return proto->net_ns_get ? proto->net_ns_get(net) : 0; | |
524a53e5 | 251 | } |
6330750d | 252 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_register); |
481fa373 | 253 | #endif |
678d6675 | 254 | |
6330750d | 255 | void nf_ct_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
524a53e5 | 256 | { |
fe3eb20c | 257 | BUG_ON(proto->l3proto >= AF_MAX); |
ae5718fb | 258 | |
b19caa0c | 259 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
260 | BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
261 | lockdep_is_held(&nf_ct_proto_mutex) | |
262 | ) != proto); | |
923f4902 PM |
263 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
264 | &nf_conntrack_l3proto_generic); | |
b19caa0c | 265 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 266 | |
0661cca9 | 267 | synchronize_rcu(); |
524a53e5 | 268 | } |
6330750d | 269 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister); |
524a53e5 | 270 | |
6330750d | 271 | void nf_ct_l3proto_pernet_unregister(struct net *net, |
524a53e5 G |
272 | struct nf_conntrack_l3proto *proto) |
273 | { | |
481fa373 FW |
274 | /* |
275 | * nf_conntrack_default_on *might* have registered hooks. | |
276 | * ->net_ns_put must cope with more puts() than get(), i.e. | |
277 | * if nf_conntrack_default_on was 0 at time of | |
278 | * nf_ct_l3proto_pernet_register invocation this net_ns_put() | |
279 | * should be a noop. | |
280 | */ | |
281 | if (proto->net_ns_put) | |
282 | proto->net_ns_put(net); | |
283 | ||
8f03dea5 | 284 | /* Remove all contrack entries for this protocol */ |
c655bc68 | 285 | nf_ct_iterate_cleanup(net, kill_l3proto, proto, 0, 0); |
8f03dea5 | 286 | } |
6330750d | 287 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_unregister); |
8f03dea5 | 288 | |
2c352f44 G |
289 | static struct nf_proto_net *nf_ct_l4proto_net(struct net *net, |
290 | struct nf_conntrack_l4proto *l4proto) | |
291 | { | |
08911475 PNA |
292 | if (l4proto->get_net_proto) { |
293 | /* statically built-in protocols use static per-net */ | |
294 | return l4proto->get_net_proto(net); | |
295 | } else if (l4proto->net_id) { | |
296 | /* ... and loadable protocols use dynamic per-net */ | |
297 | return net_generic(net, *l4proto->net_id); | |
15f585bd G |
298 | } |
299 | return NULL; | |
2c352f44 G |
300 | } |
301 | ||
302 | static | |
303 | int nf_ct_l4proto_register_sysctl(struct net *net, | |
fa34fff5 | 304 | struct nf_proto_net *pn, |
2c352f44 | 305 | struct nf_conntrack_l4proto *l4proto) |
d62f9ed4 PM |
306 | { |
307 | int err = 0; | |
308 | ||
309 | #ifdef CONFIG_SYSCTL | |
2c352f44 G |
310 | if (pn->ctl_table != NULL) { |
311 | err = nf_ct_register_sysctl(net, | |
312 | &pn->ctl_table_header, | |
f99e8f71 | 313 | "net/netfilter", |
fa34fff5 | 314 | pn->ctl_table); |
2c352f44 G |
315 | if (err < 0) { |
316 | if (!pn->users) { | |
317 | kfree(pn->ctl_table); | |
318 | pn->ctl_table = NULL; | |
319 | } | |
2c352f44 | 320 | } |
d62f9ed4 | 321 | } |
933a41e7 | 322 | #endif /* CONFIG_SYSCTL */ |
d62f9ed4 PM |
323 | return err; |
324 | } | |
325 | ||
2c352f44 G |
326 | static |
327 | void nf_ct_l4proto_unregister_sysctl(struct net *net, | |
fa34fff5 | 328 | struct nf_proto_net *pn, |
2c352f44 | 329 | struct nf_conntrack_l4proto *l4proto) |
d62f9ed4 PM |
330 | { |
331 | #ifdef CONFIG_SYSCTL | |
2c352f44 G |
332 | if (pn->ctl_table_header != NULL) |
333 | nf_ct_unregister_sysctl(&pn->ctl_table_header, | |
334 | &pn->ctl_table, | |
fa34fff5 | 335 | pn->users); |
933a41e7 | 336 | #endif /* CONFIG_SYSCTL */ |
d62f9ed4 PM |
337 | } |
338 | ||
8f03dea5 MJ |
339 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
340 | them. --RR */ | |
0e54d217 | 341 | int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *l4proto) |
8f03dea5 MJ |
342 | { |
343 | int ret = 0; | |
344 | ||
0661cca9 PM |
345 | if (l4proto->l3proto >= PF_MAX) |
346 | return -EBUSY; | |
ae5718fb | 347 | |
0e54d217 DC |
348 | if ((l4proto->to_nlattr && !l4proto->nlattr_size) || |
349 | (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size)) | |
d0dba725 HE |
350 | return -EINVAL; |
351 | ||
b19caa0c | 352 | mutex_lock(&nf_ct_proto_mutex); |
c6a1e615 | 353 | if (!nf_ct_protos[l4proto->l3proto]) { |
8f03dea5 | 354 | /* l3proto may be loaded latter. */ |
c5d277d2 | 355 | struct nf_conntrack_l4proto __rcu **proto_array; |
8f03dea5 MJ |
356 | int i; |
357 | ||
c6a1e615 PM |
358 | proto_array = kmalloc(MAX_NF_CT_PROTO * |
359 | sizeof(struct nf_conntrack_l4proto *), | |
360 | GFP_KERNEL); | |
8f03dea5 MJ |
361 | if (proto_array == NULL) { |
362 | ret = -ENOMEM; | |
b19caa0c | 363 | goto out_unlock; |
8f03dea5 | 364 | } |
c6a1e615 | 365 | |
8f03dea5 | 366 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
0e54d217 DC |
367 | RCU_INIT_POINTER(proto_array[i], |
368 | &nf_conntrack_l4proto_generic); | |
d817d29d ED |
369 | |
370 | /* Before making proto_array visible to lockless readers, | |
371 | * we must make sure its content is committed to memory. | |
372 | */ | |
373 | smp_wmb(); | |
374 | ||
c6a1e615 | 375 | nf_ct_protos[l4proto->l3proto] = proto_array; |
0e60ebe0 ED |
376 | } else if (rcu_dereference_protected( |
377 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], | |
378 | lockdep_is_held(&nf_ct_proto_mutex) | |
379 | ) != &nf_conntrack_l4proto_generic) { | |
c6a1e615 PM |
380 | ret = -EBUSY; |
381 | goto out_unlock; | |
8f03dea5 MJ |
382 | } |
383 | ||
d0dba725 HE |
384 | l4proto->nla_size = 0; |
385 | if (l4proto->nlattr_size) | |
386 | l4proto->nla_size += l4proto->nlattr_size(); | |
387 | if (l4proto->nlattr_tuple_size) | |
388 | l4proto->nla_size += 3 * l4proto->nlattr_tuple_size(); | |
389 | ||
c6a1e615 PM |
390 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
391 | l4proto); | |
8f03dea5 | 392 | out_unlock: |
b19caa0c | 393 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 MJ |
394 | return ret; |
395 | } | |
0e54d217 | 396 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_register_one); |
8f03dea5 | 397 | |
0e54d217 DC |
398 | int nf_ct_l4proto_pernet_register_one(struct net *net, |
399 | struct nf_conntrack_l4proto *l4proto) | |
8f03dea5 | 400 | { |
2c352f44 | 401 | int ret = 0; |
fa34fff5 | 402 | struct nf_proto_net *pn = NULL; |
2c352f44 | 403 | |
fa0f61f0 | 404 | if (l4proto->init_net) { |
f1caad27 | 405 | ret = l4proto->init_net(net, l4proto->l3proto); |
fa0f61f0 | 406 | if (ret < 0) |
fa34fff5 | 407 | goto out; |
fa0f61f0 | 408 | } |
678d6675 | 409 | |
fa34fff5 G |
410 | pn = nf_ct_l4proto_net(net, l4proto); |
411 | if (pn == NULL) | |
412 | goto out; | |
413 | ||
414 | ret = nf_ct_l4proto_register_sysctl(net, pn, l4proto); | |
2c352f44 | 415 | if (ret < 0) |
fa34fff5 | 416 | goto out; |
2c352f44 | 417 | |
fa34fff5 G |
418 | pn->users++; |
419 | out: | |
fa0f61f0 | 420 | return ret; |
2c352f44 | 421 | } |
0e54d217 | 422 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register_one); |
2c352f44 | 423 | |
0e54d217 | 424 | void nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto) |
2c352f44 | 425 | { |
fe3eb20c | 426 | BUG_ON(l4proto->l3proto >= PF_MAX); |
ae5718fb | 427 | |
b19caa0c | 428 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
429 | BUG_ON(rcu_dereference_protected( |
430 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], | |
431 | lockdep_is_held(&nf_ct_proto_mutex) | |
432 | ) != l4proto); | |
923f4902 PM |
433 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
434 | &nf_conntrack_l4proto_generic); | |
b19caa0c | 435 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 436 | |
0661cca9 | 437 | synchronize_rcu(); |
2c352f44 | 438 | } |
0e54d217 | 439 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister_one); |
d62f9ed4 | 440 | |
0e54d217 DC |
441 | void nf_ct_l4proto_pernet_unregister_one(struct net *net, |
442 | struct nf_conntrack_l4proto *l4proto) | |
2c352f44 | 443 | { |
fa34fff5 G |
444 | struct nf_proto_net *pn = NULL; |
445 | ||
fa34fff5 G |
446 | pn = nf_ct_l4proto_net(net, l4proto); |
447 | if (pn == NULL) | |
448 | return; | |
449 | ||
450 | pn->users--; | |
451 | nf_ct_l4proto_unregister_sysctl(net, pn, l4proto); | |
452 | ||
8f03dea5 | 453 | /* Remove all contrack entries for this protocol */ |
c655bc68 | 454 | nf_ct_iterate_cleanup(net, kill_l4proto, l4proto, 0, 0); |
8f03dea5 | 455 | } |
0e54d217 DC |
456 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister_one); |
457 | ||
458 | int nf_ct_l4proto_register(struct nf_conntrack_l4proto *l4proto[], | |
459 | unsigned int num_proto) | |
460 | { | |
461 | int ret = -EINVAL, ver; | |
462 | unsigned int i; | |
463 | ||
464 | for (i = 0; i < num_proto; i++) { | |
465 | ret = nf_ct_l4proto_register_one(l4proto[i]); | |
466 | if (ret < 0) | |
467 | break; | |
468 | } | |
469 | if (i != num_proto) { | |
470 | ver = l4proto[i]->l3proto == PF_INET6 ? 6 : 4; | |
471 | pr_err("nf_conntrack_ipv%d: can't register %s%d proto.\n", | |
472 | ver, l4proto[i]->name, ver); | |
473 | nf_ct_l4proto_unregister(l4proto, i); | |
474 | } | |
475 | return ret; | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_register); | |
478 | ||
479 | int nf_ct_l4proto_pernet_register(struct net *net, | |
480 | struct nf_conntrack_l4proto *l4proto[], | |
481 | unsigned int num_proto) | |
482 | { | |
483 | int ret = -EINVAL; | |
484 | unsigned int i; | |
485 | ||
486 | for (i = 0; i < num_proto; i++) { | |
487 | ret = nf_ct_l4proto_pernet_register_one(net, l4proto[i]); | |
488 | if (ret < 0) | |
489 | break; | |
490 | } | |
491 | if (i != num_proto) { | |
492 | pr_err("nf_conntrack_%s%d: pernet registration failed\n", | |
493 | l4proto[i]->name, | |
494 | l4proto[i]->l3proto == PF_INET6 ? 6 : 4); | |
495 | nf_ct_l4proto_pernet_unregister(net, l4proto, i); | |
496 | } | |
497 | return ret; | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register); | |
500 | ||
501 | void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *l4proto[], | |
502 | unsigned int num_proto) | |
503 | { | |
504 | while (num_proto-- != 0) | |
505 | nf_ct_l4proto_unregister_one(l4proto[num_proto]); | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister); | |
508 | ||
509 | void nf_ct_l4proto_pernet_unregister(struct net *net, | |
510 | struct nf_conntrack_l4proto *l4proto[], | |
511 | unsigned int num_proto) | |
512 | { | |
513 | while (num_proto-- != 0) | |
514 | nf_ct_l4proto_pernet_unregister_one(net, l4proto[num_proto]); | |
515 | } | |
c296bb4d | 516 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister); |
ac5357eb | 517 | |
04d87001 | 518 | int nf_conntrack_proto_pernet_init(struct net *net) |
ac5357eb | 519 | { |
ac5357eb | 520 | int err; |
fa34fff5 G |
521 | struct nf_proto_net *pn = nf_ct_l4proto_net(net, |
522 | &nf_conntrack_l4proto_generic); | |
523 | ||
f1caad27 G |
524 | err = nf_conntrack_l4proto_generic.init_net(net, |
525 | nf_conntrack_l4proto_generic.l3proto); | |
15f585bd G |
526 | if (err < 0) |
527 | return err; | |
528 | err = nf_ct_l4proto_register_sysctl(net, | |
fa34fff5 | 529 | pn, |
15f585bd | 530 | &nf_conntrack_l4proto_generic); |
ac5357eb PM |
531 | if (err < 0) |
532 | return err; | |
533 | ||
fa34fff5 | 534 | pn->users++; |
ac5357eb PM |
535 | return 0; |
536 | } | |
537 | ||
04d87001 | 538 | void nf_conntrack_proto_pernet_fini(struct net *net) |
ac5357eb | 539 | { |
fa34fff5 G |
540 | struct nf_proto_net *pn = nf_ct_l4proto_net(net, |
541 | &nf_conntrack_l4proto_generic); | |
542 | ||
543 | pn->users--; | |
15f585bd | 544 | nf_ct_l4proto_unregister_sysctl(net, |
fa34fff5 | 545 | pn, |
15f585bd | 546 | &nf_conntrack_l4proto_generic); |
04d87001 G |
547 | } |
548 | ||
549 | int nf_conntrack_proto_init(void) | |
550 | { | |
551 | unsigned int i; | |
552 | for (i = 0; i < AF_MAX; i++) | |
553 | rcu_assign_pointer(nf_ct_l3protos[i], | |
554 | &nf_conntrack_l3proto_generic); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | void nf_conntrack_proto_fini(void) | |
559 | { | |
560 | unsigned int i; | |
561 | /* free l3proto protocol tables */ | |
562 | for (i = 0; i < PF_MAX; i++) | |
563 | kfree(nf_ct_protos[i]); | |
ac5357eb | 564 | } |