Commit | Line | Data |
---|---|---|
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 | ||
524a53e5 G |
162 | static struct nf_ip_net *nf_ct_l3proto_net(struct net *net, |
163 | struct nf_conntrack_l3proto *l3proto) | |
d62f9ed4 | 164 | { |
524a53e5 G |
165 | if (l3proto->l3proto == PF_INET) |
166 | return &net->ct.nf_ct_proto; | |
167 | else | |
168 | return NULL; | |
169 | } | |
d62f9ed4 | 170 | |
524a53e5 G |
171 | static int nf_ct_l3proto_register_sysctl(struct net *net, |
172 | struct nf_conntrack_l3proto *l3proto) | |
173 | { | |
174 | int err = 0; | |
175 | struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto); | |
176 | /* nf_conntrack_l3proto_ipv6 doesn't support sysctl */ | |
177 | if (in == NULL) | |
178 | return 0; | |
179 | ||
180 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
181 | if (in->ctl_table != NULL) { | |
182 | err = nf_ct_register_sysctl(net, | |
183 | &in->ctl_table_header, | |
d62f9ed4 | 184 | l3proto->ctl_table_path, |
fa34fff5 | 185 | in->ctl_table); |
524a53e5 G |
186 | if (err < 0) { |
187 | kfree(in->ctl_table); | |
188 | in->ctl_table = NULL; | |
189 | } | |
d62f9ed4 | 190 | } |
d62f9ed4 PM |
191 | #endif |
192 | return err; | |
193 | } | |
194 | ||
524a53e5 G |
195 | static void nf_ct_l3proto_unregister_sysctl(struct net *net, |
196 | struct nf_conntrack_l3proto *l3proto) | |
d62f9ed4 | 197 | { |
524a53e5 G |
198 | struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto); |
199 | ||
200 | if (in == NULL) | |
201 | return; | |
202 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
203 | if (in->ctl_table_header != NULL) | |
204 | nf_ct_unregister_sysctl(&in->ctl_table_header, | |
205 | &in->ctl_table, | |
fa34fff5 | 206 | 0); |
d62f9ed4 PM |
207 | #endif |
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 | |
6330750d | 241 | int nf_ct_l3proto_pernet_register(struct net *net, |
524a53e5 | 242 | struct nf_conntrack_l3proto *proto) |
8f03dea5 | 243 | { |
524a53e5 G |
244 | int ret = 0; |
245 | ||
fa0f61f0 G |
246 | if (proto->init_net) { |
247 | ret = proto->init_net(net); | |
248 | if (ret < 0) | |
249 | return ret; | |
250 | } | |
524a53e5 | 251 | |
6330750d | 252 | return nf_ct_l3proto_register_sysctl(net, proto); |
524a53e5 | 253 | } |
6330750d | 254 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_register); |
678d6675 | 255 | |
6330750d | 256 | void nf_ct_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
524a53e5 | 257 | { |
fe3eb20c | 258 | BUG_ON(proto->l3proto >= AF_MAX); |
ae5718fb | 259 | |
b19caa0c | 260 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
261 | BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
262 | lockdep_is_held(&nf_ct_proto_mutex) | |
263 | ) != proto); | |
923f4902 PM |
264 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
265 | &nf_conntrack_l3proto_generic); | |
b19caa0c | 266 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 267 | |
0661cca9 | 268 | synchronize_rcu(); |
524a53e5 | 269 | } |
6330750d | 270 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister); |
524a53e5 | 271 | |
6330750d | 272 | void nf_ct_l3proto_pernet_unregister(struct net *net, |
524a53e5 G |
273 | struct nf_conntrack_l3proto *proto) |
274 | { | |
524a53e5 | 275 | nf_ct_l3proto_unregister_sysctl(net, proto); |
d62f9ed4 | 276 | |
8f03dea5 | 277 | /* Remove all contrack entries for this protocol */ |
c655bc68 | 278 | nf_ct_iterate_cleanup(net, kill_l3proto, proto, 0, 0); |
8f03dea5 | 279 | } |
6330750d | 280 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_unregister); |
8f03dea5 | 281 | |
2c352f44 G |
282 | static struct nf_proto_net *nf_ct_l4proto_net(struct net *net, |
283 | struct nf_conntrack_l4proto *l4proto) | |
284 | { | |
08911475 PNA |
285 | if (l4proto->get_net_proto) { |
286 | /* statically built-in protocols use static per-net */ | |
287 | return l4proto->get_net_proto(net); | |
288 | } else if (l4proto->net_id) { | |
289 | /* ... and loadable protocols use dynamic per-net */ | |
290 | return net_generic(net, *l4proto->net_id); | |
15f585bd G |
291 | } |
292 | return NULL; | |
2c352f44 G |
293 | } |
294 | ||
295 | static | |
296 | int nf_ct_l4proto_register_sysctl(struct net *net, | |
fa34fff5 | 297 | struct nf_proto_net *pn, |
2c352f44 | 298 | struct nf_conntrack_l4proto *l4proto) |
d62f9ed4 PM |
299 | { |
300 | int err = 0; | |
301 | ||
302 | #ifdef CONFIG_SYSCTL | |
2c352f44 G |
303 | if (pn->ctl_table != NULL) { |
304 | err = nf_ct_register_sysctl(net, | |
305 | &pn->ctl_table_header, | |
f99e8f71 | 306 | "net/netfilter", |
fa34fff5 | 307 | pn->ctl_table); |
2c352f44 G |
308 | if (err < 0) { |
309 | if (!pn->users) { | |
310 | kfree(pn->ctl_table); | |
311 | pn->ctl_table = NULL; | |
312 | } | |
2c352f44 | 313 | } |
d62f9ed4 | 314 | } |
a999e683 | 315 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
2c352f44 | 316 | if (l4proto->l3proto != AF_INET6 && pn->ctl_compat_table != NULL) { |
12c26df3 G |
317 | if (err < 0) { |
318 | nf_ct_kfree_compat_sysctl_table(pn); | |
319 | goto out; | |
320 | } | |
2c352f44 G |
321 | err = nf_ct_register_sysctl(net, |
322 | &pn->ctl_compat_header, | |
f99e8f71 | 323 | "net/ipv4/netfilter", |
fa34fff5 | 324 | pn->ctl_compat_table); |
a999e683 PM |
325 | if (err == 0) |
326 | goto out; | |
2c352f44 | 327 | |
f28997e2 | 328 | nf_ct_kfree_compat_sysctl_table(pn); |
2c352f44 G |
329 | nf_ct_unregister_sysctl(&pn->ctl_table_header, |
330 | &pn->ctl_table, | |
fa34fff5 | 331 | pn->users); |
a999e683 | 332 | } |
a999e683 | 333 | out: |
12c26df3 | 334 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
933a41e7 | 335 | #endif /* CONFIG_SYSCTL */ |
d62f9ed4 PM |
336 | return err; |
337 | } | |
338 | ||
2c352f44 G |
339 | static |
340 | void nf_ct_l4proto_unregister_sysctl(struct net *net, | |
fa34fff5 | 341 | struct nf_proto_net *pn, |
2c352f44 | 342 | struct nf_conntrack_l4proto *l4proto) |
d62f9ed4 PM |
343 | { |
344 | #ifdef CONFIG_SYSCTL | |
2c352f44 G |
345 | if (pn->ctl_table_header != NULL) |
346 | nf_ct_unregister_sysctl(&pn->ctl_table_header, | |
347 | &pn->ctl_table, | |
fa34fff5 | 348 | pn->users); |
2c352f44 | 349 | |
a999e683 | 350 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
2c352f44 G |
351 | if (l4proto->l3proto != AF_INET6 && pn->ctl_compat_header != NULL) |
352 | nf_ct_unregister_sysctl(&pn->ctl_compat_header, | |
353 | &pn->ctl_compat_table, | |
fa34fff5 | 354 | 0); |
a999e683 | 355 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
933a41e7 | 356 | #endif /* CONFIG_SYSCTL */ |
d62f9ed4 PM |
357 | } |
358 | ||
8f03dea5 MJ |
359 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
360 | them. --RR */ | |
c296bb4d | 361 | int nf_ct_l4proto_register(struct nf_conntrack_l4proto *l4proto) |
8f03dea5 MJ |
362 | { |
363 | int ret = 0; | |
364 | ||
0661cca9 PM |
365 | if (l4proto->l3proto >= PF_MAX) |
366 | return -EBUSY; | |
ae5718fb | 367 | |
d0dba725 HE |
368 | if ((l4proto->to_nlattr && !l4proto->nlattr_size) |
369 | || (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size)) | |
370 | return -EINVAL; | |
371 | ||
b19caa0c | 372 | mutex_lock(&nf_ct_proto_mutex); |
c6a1e615 | 373 | if (!nf_ct_protos[l4proto->l3proto]) { |
8f03dea5 | 374 | /* l3proto may be loaded latter. */ |
c5d277d2 | 375 | struct nf_conntrack_l4proto __rcu **proto_array; |
8f03dea5 MJ |
376 | int i; |
377 | ||
c6a1e615 PM |
378 | proto_array = kmalloc(MAX_NF_CT_PROTO * |
379 | sizeof(struct nf_conntrack_l4proto *), | |
380 | GFP_KERNEL); | |
8f03dea5 MJ |
381 | if (proto_array == NULL) { |
382 | ret = -ENOMEM; | |
b19caa0c | 383 | goto out_unlock; |
8f03dea5 | 384 | } |
c6a1e615 | 385 | |
8f03dea5 | 386 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
c5d277d2 | 387 | RCU_INIT_POINTER(proto_array[i], &nf_conntrack_l4proto_generic); |
d817d29d ED |
388 | |
389 | /* Before making proto_array visible to lockless readers, | |
390 | * we must make sure its content is committed to memory. | |
391 | */ | |
392 | smp_wmb(); | |
393 | ||
c6a1e615 | 394 | nf_ct_protos[l4proto->l3proto] = proto_array; |
0e60ebe0 ED |
395 | } else if (rcu_dereference_protected( |
396 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], | |
397 | lockdep_is_held(&nf_ct_proto_mutex) | |
398 | ) != &nf_conntrack_l4proto_generic) { | |
c6a1e615 PM |
399 | ret = -EBUSY; |
400 | goto out_unlock; | |
8f03dea5 MJ |
401 | } |
402 | ||
d0dba725 HE |
403 | l4proto->nla_size = 0; |
404 | if (l4proto->nlattr_size) | |
405 | l4proto->nla_size += l4proto->nlattr_size(); | |
406 | if (l4proto->nlattr_tuple_size) | |
407 | l4proto->nla_size += 3 * l4proto->nlattr_tuple_size(); | |
408 | ||
c6a1e615 PM |
409 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
410 | l4proto); | |
8f03dea5 | 411 | out_unlock: |
b19caa0c | 412 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 MJ |
413 | return ret; |
414 | } | |
c296bb4d | 415 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_register); |
8f03dea5 | 416 | |
c296bb4d | 417 | int nf_ct_l4proto_pernet_register(struct net *net, |
2c352f44 | 418 | struct nf_conntrack_l4proto *l4proto) |
8f03dea5 | 419 | { |
2c352f44 | 420 | int ret = 0; |
fa34fff5 | 421 | struct nf_proto_net *pn = NULL; |
2c352f44 | 422 | |
fa0f61f0 | 423 | if (l4proto->init_net) { |
f1caad27 | 424 | ret = l4proto->init_net(net, l4proto->l3proto); |
fa0f61f0 | 425 | if (ret < 0) |
fa34fff5 | 426 | goto out; |
fa0f61f0 | 427 | } |
678d6675 | 428 | |
fa34fff5 G |
429 | pn = nf_ct_l4proto_net(net, l4proto); |
430 | if (pn == NULL) | |
431 | goto out; | |
432 | ||
433 | ret = nf_ct_l4proto_register_sysctl(net, pn, l4proto); | |
2c352f44 | 434 | if (ret < 0) |
fa34fff5 | 435 | goto out; |
2c352f44 | 436 | |
fa34fff5 G |
437 | pn->users++; |
438 | out: | |
fa0f61f0 | 439 | return ret; |
2c352f44 | 440 | } |
c296bb4d | 441 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register); |
2c352f44 | 442 | |
c296bb4d | 443 | void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) |
2c352f44 | 444 | { |
fe3eb20c | 445 | BUG_ON(l4proto->l3proto >= PF_MAX); |
ae5718fb | 446 | |
b19caa0c | 447 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
448 | BUG_ON(rcu_dereference_protected( |
449 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], | |
450 | lockdep_is_held(&nf_ct_proto_mutex) | |
451 | ) != l4proto); | |
923f4902 PM |
452 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
453 | &nf_conntrack_l4proto_generic); | |
b19caa0c | 454 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 455 | |
0661cca9 | 456 | synchronize_rcu(); |
2c352f44 | 457 | } |
c296bb4d | 458 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister); |
d62f9ed4 | 459 | |
c296bb4d | 460 | void nf_ct_l4proto_pernet_unregister(struct net *net, |
2c352f44 G |
461 | struct nf_conntrack_l4proto *l4proto) |
462 | { | |
fa34fff5 G |
463 | struct nf_proto_net *pn = NULL; |
464 | ||
fa34fff5 G |
465 | pn = nf_ct_l4proto_net(net, l4proto); |
466 | if (pn == NULL) | |
467 | return; | |
468 | ||
469 | pn->users--; | |
470 | nf_ct_l4proto_unregister_sysctl(net, pn, l4proto); | |
471 | ||
8f03dea5 | 472 | /* Remove all contrack entries for this protocol */ |
c655bc68 | 473 | nf_ct_iterate_cleanup(net, kill_l4proto, l4proto, 0, 0); |
8f03dea5 | 474 | } |
c296bb4d | 475 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister); |
ac5357eb | 476 | |
04d87001 | 477 | int nf_conntrack_proto_pernet_init(struct net *net) |
ac5357eb | 478 | { |
ac5357eb | 479 | int err; |
fa34fff5 G |
480 | struct nf_proto_net *pn = nf_ct_l4proto_net(net, |
481 | &nf_conntrack_l4proto_generic); | |
482 | ||
f1caad27 G |
483 | err = nf_conntrack_l4proto_generic.init_net(net, |
484 | nf_conntrack_l4proto_generic.l3proto); | |
15f585bd G |
485 | if (err < 0) |
486 | return err; | |
487 | err = nf_ct_l4proto_register_sysctl(net, | |
fa34fff5 | 488 | pn, |
15f585bd | 489 | &nf_conntrack_l4proto_generic); |
ac5357eb PM |
490 | if (err < 0) |
491 | return err; | |
492 | ||
fa34fff5 | 493 | pn->users++; |
ac5357eb PM |
494 | return 0; |
495 | } | |
496 | ||
04d87001 | 497 | void nf_conntrack_proto_pernet_fini(struct net *net) |
ac5357eb | 498 | { |
fa34fff5 G |
499 | struct nf_proto_net *pn = nf_ct_l4proto_net(net, |
500 | &nf_conntrack_l4proto_generic); | |
501 | ||
502 | pn->users--; | |
15f585bd | 503 | nf_ct_l4proto_unregister_sysctl(net, |
fa34fff5 | 504 | pn, |
15f585bd | 505 | &nf_conntrack_l4proto_generic); |
04d87001 G |
506 | } |
507 | ||
508 | int nf_conntrack_proto_init(void) | |
509 | { | |
510 | unsigned int i; | |
511 | for (i = 0; i < AF_MAX; i++) | |
512 | rcu_assign_pointer(nf_ct_l3protos[i], | |
513 | &nf_conntrack_l3proto_generic); | |
514 | return 0; | |
515 | } | |
516 | ||
517 | void nf_conntrack_proto_fini(void) | |
518 | { | |
519 | unsigned int i; | |
520 | /* free l3proto protocol tables */ | |
521 | for (i = 0; i < PF_MAX; i++) | |
522 | kfree(nf_ct_protos[i]); | |
ac5357eb | 523 | } |