]>
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> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/netfilter.h> | |
14 | #include <linux/module.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
d62f9ed4 | 16 | #include <linux/mutex.h> |
8f03dea5 MJ |
17 | #include <linux/vmalloc.h> |
18 | #include <linux/stddef.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/percpu.h> | |
8f03dea5 MJ |
21 | #include <linux/notifier.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/netdevice.h> | |
24 | ||
25 | #include <net/netfilter/nf_conntrack.h> | |
26 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 27 | #include <net/netfilter/nf_conntrack_l4proto.h> |
8f03dea5 MJ |
28 | #include <net/netfilter/nf_conntrack_core.h> |
29 | ||
0906a372 AB |
30 | static struct nf_conntrack_l4proto __rcu **nf_ct_protos[PF_MAX] __read_mostly; |
31 | struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX] __read_mostly; | |
13b18339 | 32 | EXPORT_SYMBOL_GPL(nf_ct_l3protos); |
8f03dea5 | 33 | |
b19caa0c | 34 | static DEFINE_MUTEX(nf_ct_proto_mutex); |
d62f9ed4 | 35 | |
b19caa0c | 36 | #ifdef CONFIG_SYSCTL |
d62f9ed4 | 37 | static int |
2c352f44 G |
38 | nf_ct_register_sysctl(struct net *net, |
39 | struct ctl_table_header **header, | |
40 | const char *path, | |
fa34fff5 | 41 | struct ctl_table *table) |
d62f9ed4 PM |
42 | { |
43 | if (*header == NULL) { | |
2c352f44 | 44 | *header = register_net_sysctl(net, path, table); |
d62f9ed4 PM |
45 | if (*header == NULL) |
46 | return -ENOMEM; | |
47 | } | |
2c352f44 | 48 | |
d62f9ed4 PM |
49 | return 0; |
50 | } | |
51 | ||
52 | static void | |
53 | nf_ct_unregister_sysctl(struct ctl_table_header **header, | |
2c352f44 | 54 | struct ctl_table **table, |
fa34fff5 | 55 | unsigned int users) |
d62f9ed4 | 56 | { |
fa34fff5 | 57 | if (users > 0) |
d62f9ed4 | 58 | return; |
b3fd3ffe | 59 | |
5dd3df10 | 60 | unregister_net_sysctl_table(*header); |
2c352f44 | 61 | kfree(*table); |
d62f9ed4 | 62 | *header = NULL; |
2c352f44 | 63 | *table = NULL; |
d62f9ed4 PM |
64 | } |
65 | #endif | |
66 | ||
605dcad6 MJ |
67 | struct nf_conntrack_l4proto * |
68 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto) | |
8f03dea5 MJ |
69 | { |
70 | if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL)) | |
605dcad6 | 71 | return &nf_conntrack_l4proto_generic; |
8f03dea5 | 72 | |
923f4902 | 73 | return rcu_dereference(nf_ct_protos[l3proto][l4proto]); |
8f03dea5 | 74 | } |
13b18339 | 75 | EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find); |
8f03dea5 MJ |
76 | |
77 | /* this is guaranteed to always return a valid protocol helper, since | |
78 | * it falls back to generic_protocol */ | |
8f03dea5 MJ |
79 | struct nf_conntrack_l3proto * |
80 | nf_ct_l3proto_find_get(u_int16_t l3proto) | |
81 | { | |
82 | struct nf_conntrack_l3proto *p; | |
83 | ||
923f4902 | 84 | rcu_read_lock(); |
8f03dea5 MJ |
85 | p = __nf_ct_l3proto_find(l3proto); |
86 | if (!try_module_get(p->me)) | |
605dcad6 | 87 | p = &nf_conntrack_l3proto_generic; |
923f4902 | 88 | rcu_read_unlock(); |
8f03dea5 MJ |
89 | |
90 | return p; | |
91 | } | |
13b18339 | 92 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get); |
8f03dea5 MJ |
93 | |
94 | void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p) | |
95 | { | |
96 | module_put(p->me); | |
97 | } | |
13b18339 | 98 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_put); |
8f03dea5 MJ |
99 | |
100 | int | |
101 | nf_ct_l3proto_try_module_get(unsigned short l3proto) | |
102 | { | |
103 | int ret; | |
104 | struct nf_conntrack_l3proto *p; | |
105 | ||
106 | retry: p = nf_ct_l3proto_find_get(l3proto); | |
605dcad6 | 107 | if (p == &nf_conntrack_l3proto_generic) { |
8f03dea5 MJ |
108 | ret = request_module("nf_conntrack-%d", l3proto); |
109 | if (!ret) | |
110 | goto retry; | |
111 | ||
112 | return -EPROTOTYPE; | |
113 | } | |
114 | ||
115 | return 0; | |
116 | } | |
13b18339 | 117 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get); |
8f03dea5 MJ |
118 | |
119 | void nf_ct_l3proto_module_put(unsigned short l3proto) | |
120 | { | |
121 | struct nf_conntrack_l3proto *p; | |
122 | ||
3b254c54 PM |
123 | /* rcu_read_lock not necessary since the caller holds a reference, but |
124 | * taken anyways to avoid lockdep warnings in __nf_ct_l3proto_find() | |
125 | */ | |
126 | rcu_read_lock(); | |
8f03dea5 | 127 | p = __nf_ct_l3proto_find(l3proto); |
8f03dea5 | 128 | module_put(p->me); |
3b254c54 | 129 | rcu_read_unlock(); |
8f03dea5 | 130 | } |
13b18339 | 131 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put); |
8f03dea5 | 132 | |
c1ebd7df PNA |
133 | struct nf_conntrack_l4proto * |
134 | nf_ct_l4proto_find_get(u_int16_t l3num, u_int8_t l4num) | |
135 | { | |
136 | struct nf_conntrack_l4proto *p; | |
137 | ||
138 | rcu_read_lock(); | |
139 | p = __nf_ct_l4proto_find(l3num, l4num); | |
140 | if (!try_module_get(p->me)) | |
141 | p = &nf_conntrack_l4proto_generic; | |
142 | rcu_read_unlock(); | |
143 | ||
144 | return p; | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get); | |
147 | ||
148 | void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p) | |
149 | { | |
150 | module_put(p->me); | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_put); | |
153 | ||
8f03dea5 MJ |
154 | static int kill_l3proto(struct nf_conn *i, void *data) |
155 | { | |
5e8fbe2a | 156 | return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto; |
8f03dea5 MJ |
157 | } |
158 | ||
605dcad6 | 159 | static int kill_l4proto(struct nf_conn *i, void *data) |
8f03dea5 | 160 | { |
605dcad6 MJ |
161 | struct nf_conntrack_l4proto *l4proto; |
162 | l4proto = (struct nf_conntrack_l4proto *)data; | |
5e8fbe2a PM |
163 | return nf_ct_protonum(i) == l4proto->l4proto && |
164 | nf_ct_l3num(i) == l4proto->l3proto; | |
8f03dea5 MJ |
165 | } |
166 | ||
524a53e5 G |
167 | static struct nf_ip_net *nf_ct_l3proto_net(struct net *net, |
168 | struct nf_conntrack_l3proto *l3proto) | |
d62f9ed4 | 169 | { |
524a53e5 G |
170 | if (l3proto->l3proto == PF_INET) |
171 | return &net->ct.nf_ct_proto; | |
172 | else | |
173 | return NULL; | |
174 | } | |
d62f9ed4 | 175 | |
524a53e5 G |
176 | static int nf_ct_l3proto_register_sysctl(struct net *net, |
177 | struct nf_conntrack_l3proto *l3proto) | |
178 | { | |
179 | int err = 0; | |
180 | struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto); | |
181 | /* nf_conntrack_l3proto_ipv6 doesn't support sysctl */ | |
182 | if (in == NULL) | |
183 | return 0; | |
184 | ||
185 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
186 | if (in->ctl_table != NULL) { | |
187 | err = nf_ct_register_sysctl(net, | |
188 | &in->ctl_table_header, | |
d62f9ed4 | 189 | l3proto->ctl_table_path, |
fa34fff5 | 190 | in->ctl_table); |
524a53e5 G |
191 | if (err < 0) { |
192 | kfree(in->ctl_table); | |
193 | in->ctl_table = NULL; | |
194 | } | |
d62f9ed4 | 195 | } |
d62f9ed4 PM |
196 | #endif |
197 | return err; | |
198 | } | |
199 | ||
524a53e5 G |
200 | static void nf_ct_l3proto_unregister_sysctl(struct net *net, |
201 | struct nf_conntrack_l3proto *l3proto) | |
d62f9ed4 | 202 | { |
524a53e5 G |
203 | struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto); |
204 | ||
205 | if (in == NULL) | |
206 | return; | |
207 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
208 | if (in->ctl_table_header != NULL) | |
209 | nf_ct_unregister_sysctl(&in->ctl_table_header, | |
210 | &in->ctl_table, | |
fa34fff5 | 211 | 0); |
d62f9ed4 PM |
212 | #endif |
213 | } | |
214 | ||
6330750d | 215 | int nf_ct_l3proto_register(struct nf_conntrack_l3proto *proto) |
8f03dea5 MJ |
216 | { |
217 | int ret = 0; | |
0e60ebe0 | 218 | struct nf_conntrack_l3proto *old; |
8f03dea5 | 219 | |
0661cca9 PM |
220 | if (proto->l3proto >= AF_MAX) |
221 | return -EBUSY; | |
ae5718fb | 222 | |
d0dba725 HE |
223 | if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size) |
224 | return -EINVAL; | |
225 | ||
b19caa0c | 226 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
227 | old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
228 | lockdep_is_held(&nf_ct_proto_mutex)); | |
229 | if (old != &nf_conntrack_l3proto_generic) { | |
8f03dea5 | 230 | ret = -EBUSY; |
ae5718fb | 231 | goto out_unlock; |
8f03dea5 | 232 | } |
d62f9ed4 | 233 | |
d0dba725 HE |
234 | if (proto->nlattr_tuple_size) |
235 | proto->nla_size = 3 * proto->nlattr_tuple_size(); | |
236 | ||
0661cca9 | 237 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); |
8f03dea5 | 238 | |
ae5718fb | 239 | out_unlock: |
b19caa0c | 240 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 241 | return ret; |
524a53e5 | 242 | |
8f03dea5 | 243 | } |
6330750d | 244 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_register); |
8f03dea5 | 245 | |
6330750d | 246 | int nf_ct_l3proto_pernet_register(struct net *net, |
524a53e5 | 247 | struct nf_conntrack_l3proto *proto) |
8f03dea5 | 248 | { |
524a53e5 G |
249 | int ret = 0; |
250 | ||
fa0f61f0 G |
251 | if (proto->init_net) { |
252 | ret = proto->init_net(net); | |
253 | if (ret < 0) | |
254 | return ret; | |
255 | } | |
524a53e5 | 256 | |
6330750d | 257 | return nf_ct_l3proto_register_sysctl(net, proto); |
524a53e5 | 258 | } |
6330750d | 259 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_register); |
678d6675 | 260 | |
6330750d | 261 | void nf_ct_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
524a53e5 | 262 | { |
fe3eb20c | 263 | BUG_ON(proto->l3proto >= AF_MAX); |
ae5718fb | 264 | |
b19caa0c | 265 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
266 | BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
267 | lockdep_is_held(&nf_ct_proto_mutex) | |
268 | ) != proto); | |
923f4902 PM |
269 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
270 | &nf_conntrack_l3proto_generic); | |
b19caa0c | 271 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 272 | |
0661cca9 | 273 | synchronize_rcu(); |
524a53e5 | 274 | } |
6330750d | 275 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister); |
524a53e5 | 276 | |
6330750d | 277 | void nf_ct_l3proto_pernet_unregister(struct net *net, |
524a53e5 G |
278 | struct nf_conntrack_l3proto *proto) |
279 | { | |
524a53e5 | 280 | nf_ct_l3proto_unregister_sysctl(net, proto); |
d62f9ed4 | 281 | |
8f03dea5 | 282 | /* Remove all contrack entries for this protocol */ |
524a53e5 | 283 | nf_ct_iterate_cleanup(net, kill_l3proto, proto); |
8f03dea5 | 284 | } |
6330750d | 285 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_unregister); |
8f03dea5 | 286 | |
2c352f44 G |
287 | static struct nf_proto_net *nf_ct_l4proto_net(struct net *net, |
288 | struct nf_conntrack_l4proto *l4proto) | |
289 | { | |
08911475 PNA |
290 | if (l4proto->get_net_proto) { |
291 | /* statically built-in protocols use static per-net */ | |
292 | return l4proto->get_net_proto(net); | |
293 | } else if (l4proto->net_id) { | |
294 | /* ... and loadable protocols use dynamic per-net */ | |
295 | return net_generic(net, *l4proto->net_id); | |
15f585bd G |
296 | } |
297 | return NULL; | |
2c352f44 G |
298 | } |
299 | ||
300 | static | |
301 | int nf_ct_l4proto_register_sysctl(struct net *net, | |
fa34fff5 | 302 | struct nf_proto_net *pn, |
2c352f44 | 303 | struct nf_conntrack_l4proto *l4proto) |
d62f9ed4 PM |
304 | { |
305 | int err = 0; | |
306 | ||
307 | #ifdef CONFIG_SYSCTL | |
2c352f44 G |
308 | if (pn->ctl_table != NULL) { |
309 | err = nf_ct_register_sysctl(net, | |
310 | &pn->ctl_table_header, | |
f99e8f71 | 311 | "net/netfilter", |
fa34fff5 | 312 | pn->ctl_table); |
2c352f44 G |
313 | if (err < 0) { |
314 | if (!pn->users) { | |
315 | kfree(pn->ctl_table); | |
316 | pn->ctl_table = NULL; | |
317 | } | |
2c352f44 | 318 | } |
d62f9ed4 | 319 | } |
a999e683 | 320 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
2c352f44 | 321 | if (l4proto->l3proto != AF_INET6 && pn->ctl_compat_table != NULL) { |
12c26df3 G |
322 | if (err < 0) { |
323 | nf_ct_kfree_compat_sysctl_table(pn); | |
324 | goto out; | |
325 | } | |
2c352f44 G |
326 | err = nf_ct_register_sysctl(net, |
327 | &pn->ctl_compat_header, | |
f99e8f71 | 328 | "net/ipv4/netfilter", |
fa34fff5 | 329 | pn->ctl_compat_table); |
a999e683 PM |
330 | if (err == 0) |
331 | goto out; | |
2c352f44 | 332 | |
f28997e2 | 333 | nf_ct_kfree_compat_sysctl_table(pn); |
2c352f44 G |
334 | nf_ct_unregister_sysctl(&pn->ctl_table_header, |
335 | &pn->ctl_table, | |
fa34fff5 | 336 | pn->users); |
a999e683 | 337 | } |
a999e683 | 338 | out: |
12c26df3 | 339 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
933a41e7 | 340 | #endif /* CONFIG_SYSCTL */ |
d62f9ed4 PM |
341 | return err; |
342 | } | |
343 | ||
2c352f44 G |
344 | static |
345 | void nf_ct_l4proto_unregister_sysctl(struct net *net, | |
fa34fff5 | 346 | struct nf_proto_net *pn, |
2c352f44 | 347 | struct nf_conntrack_l4proto *l4proto) |
d62f9ed4 PM |
348 | { |
349 | #ifdef CONFIG_SYSCTL | |
2c352f44 G |
350 | if (pn->ctl_table_header != NULL) |
351 | nf_ct_unregister_sysctl(&pn->ctl_table_header, | |
352 | &pn->ctl_table, | |
fa34fff5 | 353 | pn->users); |
2c352f44 | 354 | |
a999e683 | 355 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
2c352f44 G |
356 | if (l4proto->l3proto != AF_INET6 && pn->ctl_compat_header != NULL) |
357 | nf_ct_unregister_sysctl(&pn->ctl_compat_header, | |
358 | &pn->ctl_compat_table, | |
fa34fff5 | 359 | 0); |
a999e683 | 360 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
933a41e7 | 361 | #endif /* CONFIG_SYSCTL */ |
d62f9ed4 PM |
362 | } |
363 | ||
8f03dea5 MJ |
364 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
365 | them. --RR */ | |
c296bb4d | 366 | int nf_ct_l4proto_register(struct nf_conntrack_l4proto *l4proto) |
8f03dea5 MJ |
367 | { |
368 | int ret = 0; | |
369 | ||
0661cca9 PM |
370 | if (l4proto->l3proto >= PF_MAX) |
371 | return -EBUSY; | |
ae5718fb | 372 | |
d0dba725 HE |
373 | if ((l4proto->to_nlattr && !l4proto->nlattr_size) |
374 | || (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size)) | |
375 | return -EINVAL; | |
376 | ||
b19caa0c | 377 | mutex_lock(&nf_ct_proto_mutex); |
c6a1e615 | 378 | if (!nf_ct_protos[l4proto->l3proto]) { |
8f03dea5 | 379 | /* l3proto may be loaded latter. */ |
c5d277d2 | 380 | struct nf_conntrack_l4proto __rcu **proto_array; |
8f03dea5 MJ |
381 | int i; |
382 | ||
c6a1e615 PM |
383 | proto_array = kmalloc(MAX_NF_CT_PROTO * |
384 | sizeof(struct nf_conntrack_l4proto *), | |
385 | GFP_KERNEL); | |
8f03dea5 MJ |
386 | if (proto_array == NULL) { |
387 | ret = -ENOMEM; | |
b19caa0c | 388 | goto out_unlock; |
8f03dea5 | 389 | } |
c6a1e615 | 390 | |
8f03dea5 | 391 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
c5d277d2 | 392 | RCU_INIT_POINTER(proto_array[i], &nf_conntrack_l4proto_generic); |
d817d29d ED |
393 | |
394 | /* Before making proto_array visible to lockless readers, | |
395 | * we must make sure its content is committed to memory. | |
396 | */ | |
397 | smp_wmb(); | |
398 | ||
c6a1e615 | 399 | nf_ct_protos[l4proto->l3proto] = proto_array; |
0e60ebe0 ED |
400 | } else if (rcu_dereference_protected( |
401 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], | |
402 | lockdep_is_held(&nf_ct_proto_mutex) | |
403 | ) != &nf_conntrack_l4proto_generic) { | |
c6a1e615 PM |
404 | ret = -EBUSY; |
405 | goto out_unlock; | |
8f03dea5 MJ |
406 | } |
407 | ||
d0dba725 HE |
408 | l4proto->nla_size = 0; |
409 | if (l4proto->nlattr_size) | |
410 | l4proto->nla_size += l4proto->nlattr_size(); | |
411 | if (l4proto->nlattr_tuple_size) | |
412 | l4proto->nla_size += 3 * l4proto->nlattr_tuple_size(); | |
413 | ||
c6a1e615 PM |
414 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
415 | l4proto); | |
8f03dea5 | 416 | out_unlock: |
b19caa0c | 417 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 MJ |
418 | return ret; |
419 | } | |
c296bb4d | 420 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_register); |
8f03dea5 | 421 | |
c296bb4d | 422 | int nf_ct_l4proto_pernet_register(struct net *net, |
2c352f44 | 423 | struct nf_conntrack_l4proto *l4proto) |
8f03dea5 | 424 | { |
2c352f44 | 425 | int ret = 0; |
fa34fff5 | 426 | struct nf_proto_net *pn = NULL; |
2c352f44 | 427 | |
fa0f61f0 | 428 | if (l4proto->init_net) { |
f1caad27 | 429 | ret = l4proto->init_net(net, l4proto->l3proto); |
fa0f61f0 | 430 | if (ret < 0) |
fa34fff5 | 431 | goto out; |
fa0f61f0 | 432 | } |
678d6675 | 433 | |
fa34fff5 G |
434 | pn = nf_ct_l4proto_net(net, l4proto); |
435 | if (pn == NULL) | |
436 | goto out; | |
437 | ||
438 | ret = nf_ct_l4proto_register_sysctl(net, pn, l4proto); | |
2c352f44 | 439 | if (ret < 0) |
fa34fff5 | 440 | goto out; |
2c352f44 | 441 | |
fa34fff5 G |
442 | pn->users++; |
443 | out: | |
fa0f61f0 | 444 | return ret; |
2c352f44 | 445 | } |
c296bb4d | 446 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register); |
2c352f44 | 447 | |
c296bb4d | 448 | void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) |
2c352f44 | 449 | { |
fe3eb20c | 450 | BUG_ON(l4proto->l3proto >= PF_MAX); |
ae5718fb | 451 | |
b19caa0c | 452 | mutex_lock(&nf_ct_proto_mutex); |
0e60ebe0 ED |
453 | BUG_ON(rcu_dereference_protected( |
454 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], | |
455 | lockdep_is_held(&nf_ct_proto_mutex) | |
456 | ) != l4proto); | |
923f4902 PM |
457 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
458 | &nf_conntrack_l4proto_generic); | |
b19caa0c | 459 | mutex_unlock(&nf_ct_proto_mutex); |
8f03dea5 | 460 | |
0661cca9 | 461 | synchronize_rcu(); |
2c352f44 | 462 | } |
c296bb4d | 463 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister); |
d62f9ed4 | 464 | |
c296bb4d | 465 | void nf_ct_l4proto_pernet_unregister(struct net *net, |
2c352f44 G |
466 | struct nf_conntrack_l4proto *l4proto) |
467 | { | |
fa34fff5 G |
468 | struct nf_proto_net *pn = NULL; |
469 | ||
fa34fff5 G |
470 | pn = nf_ct_l4proto_net(net, l4proto); |
471 | if (pn == NULL) | |
472 | return; | |
473 | ||
474 | pn->users--; | |
475 | nf_ct_l4proto_unregister_sysctl(net, pn, l4proto); | |
476 | ||
8f03dea5 | 477 | /* Remove all contrack entries for this protocol */ |
2c352f44 | 478 | nf_ct_iterate_cleanup(net, kill_l4proto, l4proto); |
8f03dea5 | 479 | } |
c296bb4d | 480 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister); |
ac5357eb | 481 | |
04d87001 | 482 | int nf_conntrack_proto_pernet_init(struct net *net) |
ac5357eb | 483 | { |
ac5357eb | 484 | int err; |
fa34fff5 G |
485 | struct nf_proto_net *pn = nf_ct_l4proto_net(net, |
486 | &nf_conntrack_l4proto_generic); | |
487 | ||
f1caad27 G |
488 | err = nf_conntrack_l4proto_generic.init_net(net, |
489 | nf_conntrack_l4proto_generic.l3proto); | |
15f585bd G |
490 | if (err < 0) |
491 | return err; | |
492 | err = nf_ct_l4proto_register_sysctl(net, | |
fa34fff5 | 493 | pn, |
15f585bd | 494 | &nf_conntrack_l4proto_generic); |
ac5357eb PM |
495 | if (err < 0) |
496 | return err; | |
497 | ||
fa34fff5 | 498 | pn->users++; |
ac5357eb PM |
499 | return 0; |
500 | } | |
501 | ||
04d87001 | 502 | void nf_conntrack_proto_pernet_fini(struct net *net) |
ac5357eb | 503 | { |
fa34fff5 G |
504 | struct nf_proto_net *pn = nf_ct_l4proto_net(net, |
505 | &nf_conntrack_l4proto_generic); | |
506 | ||
507 | pn->users--; | |
15f585bd | 508 | nf_ct_l4proto_unregister_sysctl(net, |
fa34fff5 | 509 | pn, |
15f585bd | 510 | &nf_conntrack_l4proto_generic); |
04d87001 G |
511 | } |
512 | ||
513 | int nf_conntrack_proto_init(void) | |
514 | { | |
515 | unsigned int i; | |
516 | for (i = 0; i < AF_MAX; i++) | |
517 | rcu_assign_pointer(nf_ct_l3protos[i], | |
518 | &nf_conntrack_l3proto_generic); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | void nf_conntrack_proto_fini(void) | |
523 | { | |
524 | unsigned int i; | |
525 | /* free l3proto protocol tables */ | |
526 | for (i = 0; i < PF_MAX; i++) | |
527 | kfree(nf_ct_protos[i]); | |
ac5357eb | 528 | } |