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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 | |
c1ebd7df PNA |
128 | struct nf_conntrack_l4proto * |
129 | nf_ct_l4proto_find_get(u_int16_t l3num, u_int8_t l4num) | |
130 | { | |
131 | struct nf_conntrack_l4proto *p; | |
132 | ||
133 | rcu_read_lock(); | |
134 | p = __nf_ct_l4proto_find(l3num, l4num); | |
135 | if (!try_module_get(p->me)) | |
136 | p = &nf_conntrack_l4proto_generic; | |
137 | rcu_read_unlock(); | |
138 | ||
139 | return p; | |
140 | } | |
141 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get); | |
142 | ||
143 | void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p) | |
144 | { | |
145 | module_put(p->me); | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_put); | |
148 | ||
8f03dea5 MJ |
149 | static int kill_l3proto(struct nf_conn *i, void *data) |
150 | { | |
5e8fbe2a | 151 | return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto; |
8f03dea5 MJ |
152 | } |
153 | ||
605dcad6 | 154 | static int kill_l4proto(struct nf_conn *i, void *data) |
8f03dea5 | 155 | { |
605dcad6 MJ |
156 | struct nf_conntrack_l4proto *l4proto; |
157 | l4proto = (struct nf_conntrack_l4proto *)data; | |
5e8fbe2a PM |
158 | return nf_ct_protonum(i) == l4proto->l4proto && |
159 | nf_ct_l3num(i) == l4proto->l3proto; | |
8f03dea5 MJ |
160 | } |
161 | ||
6330750d | 162 | int nf_ct_l3proto_register(struct nf_conntrack_l3proto *proto) |
8f03dea5 MJ |
163 | { |
164 | int ret = 0; | |
0e60ebe0 | 165 | struct nf_conntrack_l3proto *old; |
8f03dea5 | 166 | |
0661cca9 PM |
167 | if (proto->l3proto >= AF_MAX) |
168 | return -EBUSY; | |
ae5718fb | 169 | |
d0dba725 HE |
170 | if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size) |
171 | return -EINVAL; | |
172 | ||
b19caa0c | 173 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
174 | old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
175 | lockdep_is_held(&nf_ct_proto_mutex)); | |
176 | if (old != &nf_conntrack_l3proto_generic) { | |
8f03dea5 | 177 | ret = -EBUSY; |
ae5718fb | 178 | goto out_unlock; |
8f03dea5 | 179 | } |
d62f9ed4 | 180 | |
d0dba725 HE |
181 | if (proto->nlattr_tuple_size) |
182 | proto->nla_size = 3 * proto->nlattr_tuple_size(); | |
183 | ||
0661cca9 | 184 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); |
8f03dea5 | 185 | |
ae5718fb | 186 | out_unlock: |
b19caa0c | 187 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 188 | return ret; |
524a53e5 | 189 | |
8f03dea5 | 190 | } |
6330750d | 191 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_register); |
8f03dea5 | 192 | |
6330750d | 193 | int nf_ct_l3proto_pernet_register(struct net *net, |
524a53e5 | 194 | struct nf_conntrack_l3proto *proto) |
8f03dea5 | 195 | { |
adf05168 | 196 | return 0; |
524a53e5 | 197 | } |
6330750d | 198 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_register); |
678d6675 | 199 | |
6330750d | 200 | void nf_ct_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
524a53e5 | 201 | { |
fe3eb20c | 202 | BUG_ON(proto->l3proto >= AF_MAX); |
ae5718fb | 203 | |
b19caa0c | 204 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
205 | BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
206 | lockdep_is_held(&nf_ct_proto_mutex) | |
207 | ) != proto); | |
923f4902 PM |
208 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
209 | &nf_conntrack_l3proto_generic); | |
b19caa0c | 210 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 211 | |
0661cca9 | 212 | synchronize_rcu(); |
524a53e5 | 213 | } |
6330750d | 214 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister); |
524a53e5 | 215 | |
6330750d | 216 | void nf_ct_l3proto_pernet_unregister(struct net *net, |
524a53e5 G |
217 | struct nf_conntrack_l3proto *proto) |
218 | { | |
8f03dea5 | 219 | /* Remove all contrack entries for this protocol */ |
c655bc68 | 220 | nf_ct_iterate_cleanup(net, kill_l3proto, proto, 0, 0); |
8f03dea5 | 221 | } |
6330750d | 222 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_unregister); |
8f03dea5 | 223 | |
2c352f44 G |
224 | static struct nf_proto_net *nf_ct_l4proto_net(struct net *net, |
225 | struct nf_conntrack_l4proto *l4proto) | |
226 | { | |
08911475 PNA |
227 | if (l4proto->get_net_proto) { |
228 | /* statically built-in protocols use static per-net */ | |
229 | return l4proto->get_net_proto(net); | |
230 | } else if (l4proto->net_id) { | |
231 | /* ... and loadable protocols use dynamic per-net */ | |
232 | return net_generic(net, *l4proto->net_id); | |
15f585bd G |
233 | } |
234 | return NULL; | |
2c352f44 G |
235 | } |
236 | ||
237 | static | |
238 | int nf_ct_l4proto_register_sysctl(struct net *net, | |
fa34fff5 | 239 | struct nf_proto_net *pn, |
2c352f44 | 240 | struct nf_conntrack_l4proto *l4proto) |
d62f9ed4 PM |
241 | { |
242 | int err = 0; | |
243 | ||
244 | #ifdef CONFIG_SYSCTL | |
2c352f44 G |
245 | if (pn->ctl_table != NULL) { |
246 | err = nf_ct_register_sysctl(net, | |
247 | &pn->ctl_table_header, | |
f99e8f71 | 248 | "net/netfilter", |
fa34fff5 | 249 | pn->ctl_table); |
2c352f44 G |
250 | if (err < 0) { |
251 | if (!pn->users) { | |
252 | kfree(pn->ctl_table); | |
253 | pn->ctl_table = NULL; | |
254 | } | |
2c352f44 | 255 | } |
d62f9ed4 | 256 | } |
933a41e7 | 257 | #endif /* CONFIG_SYSCTL */ |
d62f9ed4 PM |
258 | return err; |
259 | } | |
260 | ||
2c352f44 G |
261 | static |
262 | void nf_ct_l4proto_unregister_sysctl(struct net *net, | |
fa34fff5 | 263 | struct nf_proto_net *pn, |
2c352f44 | 264 | struct nf_conntrack_l4proto *l4proto) |
d62f9ed4 PM |
265 | { |
266 | #ifdef CONFIG_SYSCTL | |
2c352f44 G |
267 | if (pn->ctl_table_header != NULL) |
268 | nf_ct_unregister_sysctl(&pn->ctl_table_header, | |
269 | &pn->ctl_table, | |
fa34fff5 | 270 | pn->users); |
933a41e7 | 271 | #endif /* CONFIG_SYSCTL */ |
d62f9ed4 PM |
272 | } |
273 | ||
8f03dea5 MJ |
274 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
275 | them. --RR */ | |
0e54d217 | 276 | int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *l4proto) |
8f03dea5 MJ |
277 | { |
278 | int ret = 0; | |
279 | ||
0661cca9 PM |
280 | if (l4proto->l3proto >= PF_MAX) |
281 | return -EBUSY; | |
ae5718fb | 282 | |
0e54d217 DC |
283 | if ((l4proto->to_nlattr && !l4proto->nlattr_size) || |
284 | (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size)) | |
d0dba725 HE |
285 | return -EINVAL; |
286 | ||
b19caa0c | 287 | mutex_lock(&nf_ct_proto_mutex); |
c6a1e615 | 288 | if (!nf_ct_protos[l4proto->l3proto]) { |
8f03dea5 | 289 | /* l3proto may be loaded latter. */ |
c5d277d2 | 290 | struct nf_conntrack_l4proto __rcu **proto_array; |
8f03dea5 MJ |
291 | int i; |
292 | ||
c6a1e615 PM |
293 | proto_array = kmalloc(MAX_NF_CT_PROTO * |
294 | sizeof(struct nf_conntrack_l4proto *), | |
295 | GFP_KERNEL); | |
8f03dea5 MJ |
296 | if (proto_array == NULL) { |
297 | ret = -ENOMEM; | |
b19caa0c | 298 | goto out_unlock; |
8f03dea5 | 299 | } |
c6a1e615 | 300 | |
8f03dea5 | 301 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
0e54d217 DC |
302 | RCU_INIT_POINTER(proto_array[i], |
303 | &nf_conntrack_l4proto_generic); | |
d817d29d ED |
304 | |
305 | /* Before making proto_array visible to lockless readers, | |
306 | * we must make sure its content is committed to memory. | |
307 | */ | |
308 | smp_wmb(); | |
309 | ||
c6a1e615 | 310 | nf_ct_protos[l4proto->l3proto] = proto_array; |
0e60ebe0 ED |
311 | } else if (rcu_dereference_protected( |
312 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], | |
313 | lockdep_is_held(&nf_ct_proto_mutex) | |
314 | ) != &nf_conntrack_l4proto_generic) { | |
c6a1e615 PM |
315 | ret = -EBUSY; |
316 | goto out_unlock; | |
8f03dea5 MJ |
317 | } |
318 | ||
d0dba725 HE |
319 | l4proto->nla_size = 0; |
320 | if (l4proto->nlattr_size) | |
321 | l4proto->nla_size += l4proto->nlattr_size(); | |
322 | if (l4proto->nlattr_tuple_size) | |
323 | l4proto->nla_size += 3 * l4proto->nlattr_tuple_size(); | |
324 | ||
c6a1e615 PM |
325 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
326 | l4proto); | |
8f03dea5 | 327 | out_unlock: |
b19caa0c | 328 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 MJ |
329 | return ret; |
330 | } | |
0e54d217 | 331 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_register_one); |
8f03dea5 | 332 | |
0e54d217 DC |
333 | int nf_ct_l4proto_pernet_register_one(struct net *net, |
334 | struct nf_conntrack_l4proto *l4proto) | |
8f03dea5 | 335 | { |
2c352f44 | 336 | int ret = 0; |
fa34fff5 | 337 | struct nf_proto_net *pn = NULL; |
2c352f44 | 338 | |
fa0f61f0 | 339 | if (l4proto->init_net) { |
f1caad27 | 340 | ret = l4proto->init_net(net, l4proto->l3proto); |
fa0f61f0 | 341 | if (ret < 0) |
fa34fff5 | 342 | goto out; |
fa0f61f0 | 343 | } |
678d6675 | 344 | |
fa34fff5 G |
345 | pn = nf_ct_l4proto_net(net, l4proto); |
346 | if (pn == NULL) | |
347 | goto out; | |
348 | ||
349 | ret = nf_ct_l4proto_register_sysctl(net, pn, l4proto); | |
2c352f44 | 350 | if (ret < 0) |
fa34fff5 | 351 | goto out; |
2c352f44 | 352 | |
fa34fff5 G |
353 | pn->users++; |
354 | out: | |
fa0f61f0 | 355 | return ret; |
2c352f44 | 356 | } |
0e54d217 | 357 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register_one); |
2c352f44 | 358 | |
0e54d217 | 359 | void nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto) |
2c352f44 | 360 | { |
fe3eb20c | 361 | BUG_ON(l4proto->l3proto >= PF_MAX); |
ae5718fb | 362 | |
b19caa0c | 363 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
364 | BUG_ON(rcu_dereference_protected( |
365 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], | |
366 | lockdep_is_held(&nf_ct_proto_mutex) | |
367 | ) != l4proto); | |
923f4902 PM |
368 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
369 | &nf_conntrack_l4proto_generic); | |
b19caa0c | 370 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 371 | |
0661cca9 | 372 | synchronize_rcu(); |
2c352f44 | 373 | } |
0e54d217 | 374 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister_one); |
d62f9ed4 | 375 | |
0e54d217 DC |
376 | void nf_ct_l4proto_pernet_unregister_one(struct net *net, |
377 | struct nf_conntrack_l4proto *l4proto) | |
2c352f44 | 378 | { |
fa34fff5 G |
379 | struct nf_proto_net *pn = NULL; |
380 | ||
fa34fff5 G |
381 | pn = nf_ct_l4proto_net(net, l4proto); |
382 | if (pn == NULL) | |
383 | return; | |
384 | ||
385 | pn->users--; | |
386 | nf_ct_l4proto_unregister_sysctl(net, pn, l4proto); | |
387 | ||
8f03dea5 | 388 | /* Remove all contrack entries for this protocol */ |
c655bc68 | 389 | nf_ct_iterate_cleanup(net, kill_l4proto, l4proto, 0, 0); |
8f03dea5 | 390 | } |
0e54d217 DC |
391 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister_one); |
392 | ||
393 | int nf_ct_l4proto_register(struct nf_conntrack_l4proto *l4proto[], | |
394 | unsigned int num_proto) | |
395 | { | |
396 | int ret = -EINVAL, ver; | |
397 | unsigned int i; | |
398 | ||
399 | for (i = 0; i < num_proto; i++) { | |
400 | ret = nf_ct_l4proto_register_one(l4proto[i]); | |
401 | if (ret < 0) | |
402 | break; | |
403 | } | |
404 | if (i != num_proto) { | |
405 | ver = l4proto[i]->l3proto == PF_INET6 ? 6 : 4; | |
406 | pr_err("nf_conntrack_ipv%d: can't register %s%d proto.\n", | |
407 | ver, l4proto[i]->name, ver); | |
408 | nf_ct_l4proto_unregister(l4proto, i); | |
409 | } | |
410 | return ret; | |
411 | } | |
412 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_register); | |
413 | ||
414 | int nf_ct_l4proto_pernet_register(struct net *net, | |
415 | struct nf_conntrack_l4proto *l4proto[], | |
416 | unsigned int num_proto) | |
417 | { | |
418 | int ret = -EINVAL; | |
419 | unsigned int i; | |
420 | ||
421 | for (i = 0; i < num_proto; i++) { | |
422 | ret = nf_ct_l4proto_pernet_register_one(net, l4proto[i]); | |
423 | if (ret < 0) | |
424 | break; | |
425 | } | |
426 | if (i != num_proto) { | |
427 | pr_err("nf_conntrack_%s%d: pernet registration failed\n", | |
428 | l4proto[i]->name, | |
429 | l4proto[i]->l3proto == PF_INET6 ? 6 : 4); | |
430 | nf_ct_l4proto_pernet_unregister(net, l4proto, i); | |
431 | } | |
432 | return ret; | |
433 | } | |
434 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register); | |
435 | ||
436 | void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *l4proto[], | |
437 | unsigned int num_proto) | |
438 | { | |
439 | while (num_proto-- != 0) | |
440 | nf_ct_l4proto_unregister_one(l4proto[num_proto]); | |
441 | } | |
442 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister); | |
443 | ||
444 | void nf_ct_l4proto_pernet_unregister(struct net *net, | |
445 | struct nf_conntrack_l4proto *l4proto[], | |
446 | unsigned int num_proto) | |
447 | { | |
448 | while (num_proto-- != 0) | |
449 | nf_ct_l4proto_pernet_unregister_one(net, l4proto[num_proto]); | |
450 | } | |
c296bb4d | 451 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister); |
ac5357eb | 452 | |
04d87001 | 453 | int nf_conntrack_proto_pernet_init(struct net *net) |
ac5357eb | 454 | { |
ac5357eb | 455 | int err; |
fa34fff5 G |
456 | struct nf_proto_net *pn = nf_ct_l4proto_net(net, |
457 | &nf_conntrack_l4proto_generic); | |
458 | ||
f1caad27 G |
459 | err = nf_conntrack_l4proto_generic.init_net(net, |
460 | nf_conntrack_l4proto_generic.l3proto); | |
15f585bd G |
461 | if (err < 0) |
462 | return err; | |
463 | err = nf_ct_l4proto_register_sysctl(net, | |
fa34fff5 | 464 | pn, |
15f585bd | 465 | &nf_conntrack_l4proto_generic); |
ac5357eb PM |
466 | if (err < 0) |
467 | return err; | |
468 | ||
fa34fff5 | 469 | pn->users++; |
ac5357eb PM |
470 | return 0; |
471 | } | |
472 | ||
04d87001 | 473 | void nf_conntrack_proto_pernet_fini(struct net *net) |
ac5357eb | 474 | { |
fa34fff5 G |
475 | struct nf_proto_net *pn = nf_ct_l4proto_net(net, |
476 | &nf_conntrack_l4proto_generic); | |
477 | ||
478 | pn->users--; | |
15f585bd | 479 | nf_ct_l4proto_unregister_sysctl(net, |
fa34fff5 | 480 | pn, |
15f585bd | 481 | &nf_conntrack_l4proto_generic); |
04d87001 G |
482 | } |
483 | ||
484 | int nf_conntrack_proto_init(void) | |
485 | { | |
486 | unsigned int i; | |
487 | for (i = 0; i < AF_MAX; i++) | |
488 | rcu_assign_pointer(nf_ct_l3protos[i], | |
489 | &nf_conntrack_l3proto_generic); | |
490 | return 0; | |
491 | } | |
492 | ||
493 | void nf_conntrack_proto_fini(void) | |
494 | { | |
495 | unsigned int i; | |
496 | /* free l3proto protocol tables */ | |
497 | for (i = 0; i < PF_MAX; i++) | |
498 | kfree(nf_ct_protos[i]); | |
ac5357eb | 499 | } |