Commit | Line | Data |
---|---|---|
7e5d03bb MJ |
1 | /* Helper handling for netfilter. */ |
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> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/stddef.h> | |
7e5d03bb MJ |
18 | #include <linux/random.h> |
19 | #include <linux/err.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/netdevice.h> | |
2ba4cc31 | 22 | #include <linux/rculist.h> |
efb9a8c2 | 23 | #include <linux/rtnetlink.h> |
7e5d03bb | 24 | |
7e5d03bb MJ |
25 | #include <net/netfilter/nf_conntrack.h> |
26 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
605dcad6 | 27 | #include <net/netfilter/nf_conntrack_l4proto.h> |
7e5d03bb MJ |
28 | #include <net/netfilter/nf_conntrack_helper.h> |
29 | #include <net/netfilter/nf_conntrack_core.h> | |
ceceae1b | 30 | #include <net/netfilter/nf_conntrack_extend.h> |
b20ab9cc | 31 | #include <net/netfilter/nf_log.h> |
7e5d03bb | 32 | |
58a3c9bb | 33 | static DEFINE_MUTEX(nf_ct_helper_mutex); |
12f7a505 PNA |
34 | struct hlist_head *nf_ct_helper_hash __read_mostly; |
35 | EXPORT_SYMBOL_GPL(nf_ct_helper_hash); | |
36 | unsigned int nf_ct_helper_hsize __read_mostly; | |
37 | EXPORT_SYMBOL_GPL(nf_ct_helper_hsize); | |
b8a7fe6c | 38 | static unsigned int nf_ct_helper_count __read_mostly; |
b8a7fe6c | 39 | |
a9006892 EL |
40 | static bool nf_ct_auto_assign_helper __read_mostly = true; |
41 | module_param_named(nf_conntrack_helper, nf_ct_auto_assign_helper, bool, 0644); | |
42 | MODULE_PARM_DESC(nf_conntrack_helper, | |
43 | "Enable automatic conntrack helper assignment (default 1)"); | |
44 | ||
45 | #ifdef CONFIG_SYSCTL | |
46 | static struct ctl_table helper_sysctl_table[] = { | |
47 | { | |
48 | .procname = "nf_conntrack_helper", | |
49 | .data = &init_net.ct.sysctl_auto_assign_helper, | |
50 | .maxlen = sizeof(unsigned int), | |
51 | .mode = 0644, | |
52 | .proc_handler = proc_dointvec, | |
53 | }, | |
54 | {} | |
55 | }; | |
56 | ||
57 | static int nf_conntrack_helper_init_sysctl(struct net *net) | |
58 | { | |
59 | struct ctl_table *table; | |
60 | ||
61 | table = kmemdup(helper_sysctl_table, sizeof(helper_sysctl_table), | |
62 | GFP_KERNEL); | |
63 | if (!table) | |
64 | goto out; | |
65 | ||
66 | table[0].data = &net->ct.sysctl_auto_assign_helper; | |
67 | ||
464dc801 EB |
68 | /* Don't export sysctls to unprivileged users */ |
69 | if (net->user_ns != &init_user_ns) | |
70 | table[0].procname = NULL; | |
71 | ||
a9006892 EL |
72 | net->ct.helper_sysctl_header = |
73 | register_net_sysctl(net, "net/netfilter", table); | |
74 | ||
75 | if (!net->ct.helper_sysctl_header) { | |
76 | pr_err("nf_conntrack_helper: can't register to sysctl.\n"); | |
77 | goto out_register; | |
78 | } | |
79 | return 0; | |
80 | ||
81 | out_register: | |
82 | kfree(table); | |
83 | out: | |
84 | return -ENOMEM; | |
85 | } | |
86 | ||
87 | static void nf_conntrack_helper_fini_sysctl(struct net *net) | |
88 | { | |
89 | struct ctl_table *table; | |
90 | ||
91 | table = net->ct.helper_sysctl_header->ctl_table_arg; | |
92 | unregister_net_sysctl_table(net->ct.helper_sysctl_header); | |
93 | kfree(table); | |
94 | } | |
95 | #else | |
96 | static int nf_conntrack_helper_init_sysctl(struct net *net) | |
97 | { | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static void nf_conntrack_helper_fini_sysctl(struct net *net) | |
102 | { | |
103 | } | |
104 | #endif /* CONFIG_SYSCTL */ | |
b8a7fe6c PM |
105 | |
106 | /* Stupid hash, but collision free for the default registrations of the | |
107 | * helpers currently in the kernel. */ | |
108 | static unsigned int helper_hash(const struct nf_conntrack_tuple *tuple) | |
109 | { | |
110 | return (((tuple->src.l3num << 8) | tuple->dst.protonum) ^ | |
a34c4589 | 111 | (__force __u16)tuple->src.u.all) % nf_ct_helper_hsize; |
b8a7fe6c | 112 | } |
7e5d03bb | 113 | |
226c0c0e | 114 | static struct nf_conntrack_helper * |
7e5d03bb MJ |
115 | __nf_ct_helper_find(const struct nf_conntrack_tuple *tuple) |
116 | { | |
b8a7fe6c | 117 | struct nf_conntrack_helper *helper; |
d4156e8c | 118 | struct nf_conntrack_tuple_mask mask = { .src.u.all = htons(0xFFFF) }; |
b8a7fe6c | 119 | unsigned int h; |
7e5d03bb | 120 | |
b8a7fe6c PM |
121 | if (!nf_ct_helper_count) |
122 | return NULL; | |
123 | ||
124 | h = helper_hash(tuple); | |
b67bfe0d | 125 | hlist_for_each_entry_rcu(helper, &nf_ct_helper_hash[h], hnode) { |
b8a7fe6c PM |
126 | if (nf_ct_tuple_src_mask_cmp(tuple, &helper->tuple, &mask)) |
127 | return helper; | |
7e5d03bb MJ |
128 | } |
129 | return NULL; | |
130 | } | |
7e5d03bb MJ |
131 | |
132 | struct nf_conntrack_helper * | |
794e6871 | 133 | __nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum) |
7e5d03bb MJ |
134 | { |
135 | struct nf_conntrack_helper *h; | |
b8a7fe6c | 136 | unsigned int i; |
7e5d03bb | 137 | |
b8a7fe6c | 138 | for (i = 0; i < nf_ct_helper_hsize; i++) { |
b67bfe0d | 139 | hlist_for_each_entry_rcu(h, &nf_ct_helper_hash[i], hnode) { |
794e6871 PM |
140 | if (!strcmp(h->name, name) && |
141 | h->tuple.src.l3num == l3num && | |
142 | h->tuple.dst.protonum == protonum) | |
b8a7fe6c PM |
143 | return h; |
144 | } | |
7e5d03bb | 145 | } |
7e5d03bb MJ |
146 | return NULL; |
147 | } | |
794e6871 | 148 | EXPORT_SYMBOL_GPL(__nf_conntrack_helper_find); |
7e5d03bb | 149 | |
84f3bb9a PM |
150 | struct nf_conntrack_helper * |
151 | nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum) | |
152 | { | |
153 | struct nf_conntrack_helper *h; | |
154 | ||
155 | h = __nf_conntrack_helper_find(name, l3num, protonum); | |
156 | #ifdef CONFIG_MODULES | |
157 | if (h == NULL) { | |
158 | if (request_module("nfct-helper-%s", name) == 0) | |
159 | h = __nf_conntrack_helper_find(name, l3num, protonum); | |
160 | } | |
161 | #endif | |
162 | if (h != NULL && !try_module_get(h->me)) | |
163 | h = NULL; | |
164 | ||
165 | return h; | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(nf_conntrack_helper_try_module_get); | |
168 | ||
1afc5679 PNA |
169 | struct nf_conn_help * |
170 | nf_ct_helper_ext_add(struct nf_conn *ct, | |
171 | struct nf_conntrack_helper *helper, gfp_t gfp) | |
b560580a PM |
172 | { |
173 | struct nf_conn_help *help; | |
174 | ||
1afc5679 PNA |
175 | help = nf_ct_ext_add_length(ct, NF_CT_EXT_HELPER, |
176 | helper->data_len, gfp); | |
b560580a PM |
177 | if (help) |
178 | INIT_HLIST_HEAD(&help->expectations); | |
179 | else | |
180 | pr_debug("failed to add helper extension area"); | |
181 | return help; | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(nf_ct_helper_ext_add); | |
184 | ||
b2a15a60 PM |
185 | int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl, |
186 | gfp_t flags) | |
226c0c0e | 187 | { |
b2a15a60 PM |
188 | struct nf_conntrack_helper *helper = NULL; |
189 | struct nf_conn_help *help; | |
a9006892 | 190 | struct net *net = nf_ct_net(ct); |
226c0c0e | 191 | int ret = 0; |
226c0c0e | 192 | |
6714cf54 PNA |
193 | /* We already got a helper explicitly attached. The function |
194 | * nf_conntrack_alter_reply - in case NAT is in use - asks for looking | |
195 | * the helper up again. Since now the user is in full control of | |
196 | * making consistent helper configurations, skip this automatic | |
197 | * re-lookup, otherwise we'll lose the helper. | |
198 | */ | |
199 | if (test_bit(IPS_HELPER_BIT, &ct->status)) | |
200 | return 0; | |
201 | ||
b2a15a60 PM |
202 | if (tmpl != NULL) { |
203 | help = nfct_help(tmpl); | |
6714cf54 | 204 | if (help != NULL) { |
b2a15a60 | 205 | helper = help->helper; |
6714cf54 PNA |
206 | set_bit(IPS_HELPER_BIT, &ct->status); |
207 | } | |
b2a15a60 PM |
208 | } |
209 | ||
210 | help = nfct_help(ct); | |
a9006892 | 211 | if (net->ct.sysctl_auto_assign_helper && helper == NULL) { |
b2a15a60 | 212 | helper = __nf_ct_helper_find(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
a9006892 EL |
213 | if (unlikely(!net->ct.auto_assign_helper_warned && helper)) { |
214 | pr_info("nf_conntrack: automatic helper " | |
215 | "assignment is deprecated and it will " | |
216 | "be removed soon. Use the iptables CT target " | |
217 | "to attach helpers instead.\n"); | |
218 | net->ct.auto_assign_helper_warned = true; | |
219 | } | |
220 | } | |
221 | ||
226c0c0e PNA |
222 | if (helper == NULL) { |
223 | if (help) | |
a9b3cd7f | 224 | RCU_INIT_POINTER(help->helper, NULL); |
226c0c0e PNA |
225 | goto out; |
226 | } | |
227 | ||
228 | if (help == NULL) { | |
1afc5679 | 229 | help = nf_ct_helper_ext_add(ct, helper, flags); |
226c0c0e PNA |
230 | if (help == NULL) { |
231 | ret = -ENOMEM; | |
232 | goto out; | |
233 | } | |
234 | } else { | |
32f53760 PNA |
235 | /* We only allow helper re-assignment of the same sort since |
236 | * we cannot reallocate the helper extension area. | |
237 | */ | |
6e2f0aa8 FW |
238 | struct nf_conntrack_helper *tmp = rcu_dereference(help->helper); |
239 | ||
240 | if (tmp && tmp->help != helper->help) { | |
32f53760 PNA |
241 | RCU_INIT_POINTER(help->helper, NULL); |
242 | goto out; | |
243 | } | |
226c0c0e PNA |
244 | } |
245 | ||
cf778b00 | 246 | rcu_assign_pointer(help->helper, helper); |
226c0c0e PNA |
247 | out: |
248 | return ret; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(__nf_ct_try_assign_helper); | |
251 | ||
7e5d03bb MJ |
252 | static inline int unhelp(struct nf_conntrack_tuple_hash *i, |
253 | const struct nf_conntrack_helper *me) | |
254 | { | |
255 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i); | |
256 | struct nf_conn_help *help = nfct_help(ct); | |
257 | ||
c5d277d2 ED |
258 | if (help && rcu_dereference_protected( |
259 | help->helper, | |
260 | lockdep_is_held(&nf_conntrack_lock) | |
261 | ) == me) { | |
7e5d03bb | 262 | nf_conntrack_event(IPCT_HELPER, ct); |
a9b3cd7f | 263 | RCU_INIT_POINTER(help->helper, NULL); |
7e5d03bb MJ |
264 | } |
265 | return 0; | |
266 | } | |
267 | ||
9858a3ae PNA |
268 | void nf_ct_helper_destroy(struct nf_conn *ct) |
269 | { | |
270 | struct nf_conn_help *help = nfct_help(ct); | |
271 | struct nf_conntrack_helper *helper; | |
272 | ||
273 | if (help) { | |
274 | rcu_read_lock(); | |
275 | helper = rcu_dereference(help->helper); | |
276 | if (helper && helper->destroy) | |
277 | helper->destroy(ct); | |
278 | rcu_read_unlock(); | |
279 | } | |
280 | } | |
281 | ||
544d5c7d PNA |
282 | static LIST_HEAD(nf_ct_helper_expectfn_list); |
283 | ||
284 | void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n) | |
285 | { | |
286 | spin_lock_bh(&nf_conntrack_lock); | |
287 | list_add_rcu(&n->head, &nf_ct_helper_expectfn_list); | |
288 | spin_unlock_bh(&nf_conntrack_lock); | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(nf_ct_helper_expectfn_register); | |
291 | ||
292 | void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n) | |
293 | { | |
294 | spin_lock_bh(&nf_conntrack_lock); | |
295 | list_del_rcu(&n->head); | |
296 | spin_unlock_bh(&nf_conntrack_lock); | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(nf_ct_helper_expectfn_unregister); | |
299 | ||
300 | struct nf_ct_helper_expectfn * | |
301 | nf_ct_helper_expectfn_find_by_name(const char *name) | |
302 | { | |
303 | struct nf_ct_helper_expectfn *cur; | |
304 | bool found = false; | |
305 | ||
306 | rcu_read_lock(); | |
307 | list_for_each_entry_rcu(cur, &nf_ct_helper_expectfn_list, head) { | |
308 | if (!strcmp(cur->name, name)) { | |
309 | found = true; | |
310 | break; | |
311 | } | |
312 | } | |
313 | rcu_read_unlock(); | |
314 | return found ? cur : NULL; | |
315 | } | |
316 | EXPORT_SYMBOL_GPL(nf_ct_helper_expectfn_find_by_name); | |
317 | ||
318 | struct nf_ct_helper_expectfn * | |
319 | nf_ct_helper_expectfn_find_by_symbol(const void *symbol) | |
320 | { | |
321 | struct nf_ct_helper_expectfn *cur; | |
322 | bool found = false; | |
323 | ||
324 | rcu_read_lock(); | |
325 | list_for_each_entry_rcu(cur, &nf_ct_helper_expectfn_list, head) { | |
326 | if (cur->expectfn == symbol) { | |
327 | found = true; | |
328 | break; | |
329 | } | |
330 | } | |
331 | rcu_read_unlock(); | |
332 | return found ? cur : NULL; | |
333 | } | |
334 | EXPORT_SYMBOL_GPL(nf_ct_helper_expectfn_find_by_symbol); | |
335 | ||
b20ab9cc PNA |
336 | __printf(3, 4) |
337 | void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct, | |
338 | const char *fmt, ...) | |
339 | { | |
340 | const struct nf_conn_help *help; | |
341 | const struct nf_conntrack_helper *helper; | |
f9caed59 JP |
342 | struct va_format vaf; |
343 | va_list args; | |
344 | ||
345 | va_start(args, fmt); | |
346 | ||
347 | vaf.fmt = fmt; | |
348 | vaf.va = &args; | |
b20ab9cc PNA |
349 | |
350 | /* Called from the helper function, this call never fails */ | |
351 | help = nfct_help(ct); | |
352 | ||
353 | /* rcu_read_lock()ed by nf_hook_slow */ | |
354 | helper = rcu_dereference(help->helper); | |
355 | ||
356 | nf_log_packet(nf_ct_l3num(ct), 0, skb, NULL, NULL, NULL, | |
f9caed59 JP |
357 | "nf_ct_%s: dropping packet: %pV ", helper->name, &vaf); |
358 | ||
359 | va_end(args); | |
b20ab9cc PNA |
360 | } |
361 | EXPORT_SYMBOL_GPL(nf_ct_helper_log); | |
362 | ||
7e5d03bb MJ |
363 | int nf_conntrack_helper_register(struct nf_conntrack_helper *me) |
364 | { | |
12f7a505 PNA |
365 | int ret = 0; |
366 | struct nf_conntrack_helper *cur; | |
b8a7fe6c PM |
367 | unsigned int h = helper_hash(&me->tuple); |
368 | ||
6002f266 PM |
369 | BUG_ON(me->expect_policy == NULL); |
370 | BUG_ON(me->expect_class_max >= NF_CT_MAX_EXPECT_CLASSES); | |
af9d32ad | 371 | BUG_ON(strlen(me->name) > NF_CT_HELPER_NAME_LEN - 1); |
7e5d03bb | 372 | |
58a3c9bb | 373 | mutex_lock(&nf_ct_helper_mutex); |
b67bfe0d | 374 | hlist_for_each_entry(cur, &nf_ct_helper_hash[h], hnode) { |
12f7a505 PNA |
375 | if (strncmp(cur->name, me->name, NF_CT_HELPER_NAME_LEN) == 0 && |
376 | cur->tuple.src.l3num == me->tuple.src.l3num && | |
377 | cur->tuple.dst.protonum == me->tuple.dst.protonum) { | |
378 | ret = -EEXIST; | |
379 | goto out; | |
380 | } | |
381 | } | |
58a3c9bb | 382 | hlist_add_head_rcu(&me->hnode, &nf_ct_helper_hash[h]); |
b8a7fe6c | 383 | nf_ct_helper_count++; |
12f7a505 | 384 | out: |
58a3c9bb | 385 | mutex_unlock(&nf_ct_helper_mutex); |
12f7a505 | 386 | return ret; |
7e5d03bb | 387 | } |
13b18339 | 388 | EXPORT_SYMBOL_GPL(nf_conntrack_helper_register); |
7e5d03bb | 389 | |
68047937 AD |
390 | static void __nf_conntrack_helper_unregister(struct nf_conntrack_helper *me, |
391 | struct net *net) | |
7e5d03bb | 392 | { |
7e5d03bb | 393 | struct nf_conntrack_tuple_hash *h; |
31f15875 | 394 | struct nf_conntrack_expect *exp; |
b67bfe0d | 395 | const struct hlist_node *next; |
ea781f19 | 396 | const struct hlist_nulls_node *nn; |
31f15875 | 397 | unsigned int i; |
7e5d03bb | 398 | |
7e5d03bb | 399 | /* Get rid of expectations */ |
31f15875 | 400 | for (i = 0; i < nf_ct_expect_hsize; i++) { |
b67bfe0d | 401 | hlist_for_each_entry_safe(exp, next, |
68047937 | 402 | &net->ct.expect_hash[i], hnode) { |
31f15875 | 403 | struct nf_conn_help *help = nfct_help(exp->master); |
c5d277d2 ED |
404 | if ((rcu_dereference_protected( |
405 | help->helper, | |
406 | lockdep_is_held(&nf_conntrack_lock) | |
407 | ) == me || exp->helper == me) && | |
31f15875 PM |
408 | del_timer(&exp->timeout)) { |
409 | nf_ct_unlink_expect(exp); | |
410 | nf_ct_expect_put(exp); | |
411 | } | |
7e5d03bb MJ |
412 | } |
413 | } | |
414 | ||
415 | /* Get rid of expecteds, set helpers to NULL. */ | |
38fb0afc | 416 | hlist_nulls_for_each_entry(h, nn, &net->ct.unconfirmed, hnnode) |
7e5d03bb | 417 | unhelp(h, me); |
d696c7bd | 418 | for (i = 0; i < net->ct.htable_size; i++) { |
ea781f19 | 419 | hlist_nulls_for_each_entry(h, nn, &net->ct.hash[i], hnnode) |
7e5d03bb MJ |
420 | unhelp(h, me); |
421 | } | |
68047937 AD |
422 | } |
423 | ||
424 | void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me) | |
425 | { | |
426 | struct net *net; | |
427 | ||
428 | mutex_lock(&nf_ct_helper_mutex); | |
429 | hlist_del_rcu(&me->hnode); | |
430 | nf_ct_helper_count--; | |
431 | mutex_unlock(&nf_ct_helper_mutex); | |
432 | ||
433 | /* Make sure every nothing is still using the helper unless its a | |
434 | * connection in the hash. | |
435 | */ | |
436 | synchronize_rcu(); | |
437 | ||
efb9a8c2 | 438 | rtnl_lock(); |
68047937 AD |
439 | spin_lock_bh(&nf_conntrack_lock); |
440 | for_each_net(net) | |
441 | __nf_conntrack_helper_unregister(me, net); | |
f8ba1aff | 442 | spin_unlock_bh(&nf_conntrack_lock); |
efb9a8c2 | 443 | rtnl_unlock(); |
7e5d03bb | 444 | } |
13b18339 | 445 | EXPORT_SYMBOL_GPL(nf_conntrack_helper_unregister); |
ceceae1b | 446 | |
61eb3107 | 447 | static struct nf_ct_ext_type helper_extend __read_mostly = { |
ceceae1b YK |
448 | .len = sizeof(struct nf_conn_help), |
449 | .align = __alignof__(struct nf_conn_help), | |
450 | .id = NF_CT_EXT_HELPER, | |
451 | }; | |
452 | ||
5e615b22 | 453 | int nf_conntrack_helper_pernet_init(struct net *net) |
ceceae1b | 454 | { |
a9006892 EL |
455 | net->ct.auto_assign_helper_warned = false; |
456 | net->ct.sysctl_auto_assign_helper = nf_ct_auto_assign_helper; | |
5e615b22 G |
457 | return nf_conntrack_helper_init_sysctl(net); |
458 | } | |
b8a7fe6c | 459 | |
5e615b22 G |
460 | void nf_conntrack_helper_pernet_fini(struct net *net) |
461 | { | |
462 | nf_conntrack_helper_fini_sysctl(net); | |
463 | } | |
a9006892 | 464 | |
5e615b22 G |
465 | int nf_conntrack_helper_init(void) |
466 | { | |
467 | int ret; | |
468 | nf_ct_helper_hsize = 1; /* gets rounded up to use one page */ | |
469 | nf_ct_helper_hash = | |
470 | nf_ct_alloc_hashtable(&nf_ct_helper_hsize, 0); | |
471 | if (!nf_ct_helper_hash) | |
472 | return -ENOMEM; | |
473 | ||
474 | ret = nf_ct_extend_register(&helper_extend); | |
475 | if (ret < 0) { | |
476 | pr_err("nf_ct_helper: Unable to register helper extension.\n"); | |
477 | goto out_extend; | |
a9006892 EL |
478 | } |
479 | ||
b8a7fe6c | 480 | return 0; |
5e615b22 | 481 | out_extend: |
d862a662 | 482 | nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize); |
5e615b22 | 483 | return ret; |
ceceae1b YK |
484 | } |
485 | ||
5e615b22 | 486 | void nf_conntrack_helper_fini(void) |
ceceae1b | 487 | { |
5e615b22 G |
488 | nf_ct_extend_unregister(&helper_extend); |
489 | nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize); | |
ceceae1b | 490 | } |