Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 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> |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 18 | #include <linux/random.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/netdevice.h> |
Ingo Molnar | 2ba4cc3 | 2008-05-13 15:37:05 +0200 | [diff] [blame] | 22 | #include <linux/rculist.h> |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 23 | #include <linux/rtnetlink.h> |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 24 | |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 25 | #include <net/netfilter/nf_conntrack.h> |
| 26 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 27 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 28 | #include <net/netfilter/nf_conntrack_helper.h> |
| 29 | #include <net/netfilter/nf_conntrack_core.h> |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 30 | #include <net/netfilter/nf_conntrack_extend.h> |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 31 | |
Patrick McHardy | 58a3c9b | 2008-01-31 04:36:54 -0800 | [diff] [blame] | 32 | static DEFINE_MUTEX(nf_ct_helper_mutex); |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 33 | static struct hlist_head *nf_ct_helper_hash __read_mostly; |
| 34 | static unsigned int nf_ct_helper_hsize __read_mostly; |
| 35 | static unsigned int nf_ct_helper_count __read_mostly; |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 36 | |
| 37 | |
| 38 | /* Stupid hash, but collision free for the default registrations of the |
| 39 | * helpers currently in the kernel. */ |
| 40 | static unsigned int helper_hash(const struct nf_conntrack_tuple *tuple) |
| 41 | { |
| 42 | return (((tuple->src.l3num << 8) | tuple->dst.protonum) ^ |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 43 | (__force __u16)tuple->src.u.all) % nf_ct_helper_hsize; |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 44 | } |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 45 | |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 46 | static struct nf_conntrack_helper * |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 47 | __nf_ct_helper_find(const struct nf_conntrack_tuple *tuple) |
| 48 | { |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 49 | struct nf_conntrack_helper *helper; |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 50 | struct nf_conntrack_tuple_mask mask = { .src.u.all = htons(0xFFFF) }; |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 51 | struct hlist_node *n; |
| 52 | unsigned int h; |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 53 | |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 54 | if (!nf_ct_helper_count) |
| 55 | return NULL; |
| 56 | |
| 57 | h = helper_hash(tuple); |
Patrick McHardy | 58a3c9b | 2008-01-31 04:36:54 -0800 | [diff] [blame] | 58 | hlist_for_each_entry_rcu(helper, n, &nf_ct_helper_hash[h], hnode) { |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 59 | if (nf_ct_tuple_src_mask_cmp(tuple, &helper->tuple, &mask)) |
| 60 | return helper; |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 61 | } |
| 62 | return NULL; |
| 63 | } |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 64 | |
| 65 | struct nf_conntrack_helper * |
Patrick McHardy | 794e687 | 2010-02-03 13:41:29 +0100 | [diff] [blame] | 66 | __nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum) |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 67 | { |
| 68 | struct nf_conntrack_helper *h; |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 69 | struct hlist_node *n; |
| 70 | unsigned int i; |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 71 | |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 72 | for (i = 0; i < nf_ct_helper_hsize; i++) { |
Patrick McHardy | 58a3c9b | 2008-01-31 04:36:54 -0800 | [diff] [blame] | 73 | hlist_for_each_entry_rcu(h, n, &nf_ct_helper_hash[i], hnode) { |
Patrick McHardy | 794e687 | 2010-02-03 13:41:29 +0100 | [diff] [blame] | 74 | if (!strcmp(h->name, name) && |
| 75 | h->tuple.src.l3num == l3num && |
| 76 | h->tuple.dst.protonum == protonum) |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 77 | return h; |
| 78 | } |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 79 | } |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 80 | return NULL; |
| 81 | } |
Patrick McHardy | 794e687 | 2010-02-03 13:41:29 +0100 | [diff] [blame] | 82 | EXPORT_SYMBOL_GPL(__nf_conntrack_helper_find); |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 83 | |
Patrick McHardy | 84f3bb9 | 2010-02-03 17:17:06 +0100 | [diff] [blame] | 84 | struct nf_conntrack_helper * |
| 85 | nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum) |
| 86 | { |
| 87 | struct nf_conntrack_helper *h; |
| 88 | |
| 89 | h = __nf_conntrack_helper_find(name, l3num, protonum); |
| 90 | #ifdef CONFIG_MODULES |
| 91 | if (h == NULL) { |
| 92 | if (request_module("nfct-helper-%s", name) == 0) |
| 93 | h = __nf_conntrack_helper_find(name, l3num, protonum); |
| 94 | } |
| 95 | #endif |
| 96 | if (h != NULL && !try_module_get(h->me)) |
| 97 | h = NULL; |
| 98 | |
| 99 | return h; |
| 100 | } |
| 101 | EXPORT_SYMBOL_GPL(nf_conntrack_helper_try_module_get); |
| 102 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 103 | struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp) |
| 104 | { |
| 105 | struct nf_conn_help *help; |
| 106 | |
| 107 | help = nf_ct_ext_add(ct, NF_CT_EXT_HELPER, gfp); |
| 108 | if (help) |
| 109 | INIT_HLIST_HEAD(&help->expectations); |
| 110 | else |
| 111 | pr_debug("failed to add helper extension area"); |
| 112 | return help; |
| 113 | } |
| 114 | EXPORT_SYMBOL_GPL(nf_ct_helper_ext_add); |
| 115 | |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 116 | int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl, |
| 117 | gfp_t flags) |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 118 | { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 119 | struct nf_conntrack_helper *helper = NULL; |
| 120 | struct nf_conn_help *help; |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 121 | int ret = 0; |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 122 | |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 123 | if (tmpl != NULL) { |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 124 | /* we've got a userspace helper. */ |
| 125 | if (tmpl->status & IPS_USERSPACE_HELPER) { |
| 126 | help = nf_ct_helper_ext_add(ct, flags); |
| 127 | if (help == NULL) { |
| 128 | ret = -ENOMEM; |
| 129 | goto out; |
| 130 | } |
| 131 | rcu_assign_pointer(help->helper, NULL); |
| 132 | __set_bit(IPS_USERSPACE_HELPER_BIT, &ct->status); |
| 133 | ret = 0; |
| 134 | goto out; |
| 135 | } |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 136 | help = nfct_help(tmpl); |
| 137 | if (help != NULL) |
| 138 | helper = help->helper; |
| 139 | } |
| 140 | |
| 141 | help = nfct_help(ct); |
| 142 | if (helper == NULL) |
| 143 | helper = __nf_ct_helper_find(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 144 | if (helper == NULL) { |
| 145 | if (help) |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 146 | RCU_INIT_POINTER(help->helper, NULL); |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 147 | goto out; |
| 148 | } |
| 149 | |
| 150 | if (help == NULL) { |
| 151 | help = nf_ct_helper_ext_add(ct, flags); |
| 152 | if (help == NULL) { |
| 153 | ret = -ENOMEM; |
| 154 | goto out; |
| 155 | } |
| 156 | } else { |
| 157 | memset(&help->help, 0, sizeof(help->help)); |
| 158 | } |
| 159 | |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 160 | RCU_INIT_POINTER(help->helper, helper); |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 161 | out: |
| 162 | return ret; |
| 163 | } |
| 164 | EXPORT_SYMBOL_GPL(__nf_ct_try_assign_helper); |
| 165 | |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 166 | static inline int unhelp(struct nf_conntrack_tuple_hash *i, |
| 167 | const struct nf_conntrack_helper *me) |
| 168 | { |
| 169 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(i); |
| 170 | struct nf_conn_help *help = nfct_help(ct); |
| 171 | |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 172 | if (help && rcu_dereference_protected( |
| 173 | help->helper, |
| 174 | lockdep_is_held(&nf_conntrack_lock) |
| 175 | ) == me) { |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 176 | nf_conntrack_event(IPCT_HELPER, ct); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 177 | RCU_INIT_POINTER(help->helper, NULL); |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 178 | } |
| 179 | return 0; |
| 180 | } |
| 181 | |
Pablo Neira Ayuso | 9858a3a | 2009-06-13 12:28:22 +0200 | [diff] [blame] | 182 | void nf_ct_helper_destroy(struct nf_conn *ct) |
| 183 | { |
| 184 | struct nf_conn_help *help = nfct_help(ct); |
| 185 | struct nf_conntrack_helper *helper; |
| 186 | |
| 187 | if (help) { |
| 188 | rcu_read_lock(); |
| 189 | helper = rcu_dereference(help->helper); |
| 190 | if (helper && helper->destroy) |
| 191 | helper->destroy(ct); |
| 192 | rcu_read_unlock(); |
| 193 | } |
| 194 | } |
| 195 | |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 196 | int nf_conntrack_helper_register(struct nf_conntrack_helper *me) |
| 197 | { |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 198 | unsigned int h = helper_hash(&me->tuple); |
| 199 | |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 200 | BUG_ON(me->expect_policy == NULL); |
| 201 | BUG_ON(me->expect_class_max >= NF_CT_MAX_EXPECT_CLASSES); |
Holger Eitzenberger | af9d32a | 2009-03-25 18:44:01 +0100 | [diff] [blame] | 202 | BUG_ON(strlen(me->name) > NF_CT_HELPER_NAME_LEN - 1); |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 203 | |
Patrick McHardy | 58a3c9b | 2008-01-31 04:36:54 -0800 | [diff] [blame] | 204 | mutex_lock(&nf_ct_helper_mutex); |
| 205 | hlist_add_head_rcu(&me->hnode, &nf_ct_helper_hash[h]); |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 206 | nf_ct_helper_count++; |
Patrick McHardy | 58a3c9b | 2008-01-31 04:36:54 -0800 | [diff] [blame] | 207 | mutex_unlock(&nf_ct_helper_mutex); |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 208 | |
| 209 | return 0; |
| 210 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 211 | EXPORT_SYMBOL_GPL(nf_conntrack_helper_register); |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 212 | |
Alexey Dobriyan | 6804793 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 213 | static void __nf_conntrack_helper_unregister(struct nf_conntrack_helper *me, |
| 214 | struct net *net) |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 215 | { |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 216 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 31f1587 | 2007-07-07 22:35:21 -0700 | [diff] [blame] | 217 | struct nf_conntrack_expect *exp; |
Jan Engelhardt | 58c0fb0 | 2008-04-14 11:15:42 +0200 | [diff] [blame] | 218 | const struct hlist_node *n, *next; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 219 | const struct hlist_nulls_node *nn; |
Patrick McHardy | 31f1587 | 2007-07-07 22:35:21 -0700 | [diff] [blame] | 220 | unsigned int i; |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 221 | |
Alexey Dobriyan | 6804793 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 222 | /* Get rid of expectations */ |
| 223 | for (i = 0; i < nf_ct_expect_hsize; i++) { |
| 224 | hlist_for_each_entry_safe(exp, n, next, |
| 225 | &net->ct.expect_hash[i], hnode) { |
| 226 | struct nf_conn_help *help = nfct_help(exp->master); |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 227 | if ((rcu_dereference_protected( |
| 228 | help->helper, |
| 229 | lockdep_is_held(&nf_conntrack_lock) |
| 230 | ) == me || exp->helper == me) && |
Alexey Dobriyan | 6804793 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 231 | del_timer(&exp->timeout)) { |
| 232 | nf_ct_unlink_expect(exp); |
| 233 | nf_ct_expect_put(exp); |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | /* Get rid of expecteds, set helpers to NULL. */ |
Patrick McHardy | 38fb0af | 2009-04-15 12:45:08 +0200 | [diff] [blame] | 239 | hlist_nulls_for_each_entry(h, nn, &net->ct.unconfirmed, hnnode) |
Alexey Dobriyan | 6804793 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 240 | unhelp(h, me); |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 241 | for (i = 0; i < net->ct.htable_size; i++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 242 | hlist_nulls_for_each_entry(h, nn, &net->ct.hash[i], hnnode) |
Alexey Dobriyan | 6804793 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 243 | unhelp(h, me); |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me) |
| 248 | { |
| 249 | struct net *net; |
| 250 | |
Patrick McHardy | 58a3c9b | 2008-01-31 04:36:54 -0800 | [diff] [blame] | 251 | mutex_lock(&nf_ct_helper_mutex); |
| 252 | hlist_del_rcu(&me->hnode); |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 253 | nf_ct_helper_count--; |
Patrick McHardy | 58a3c9b | 2008-01-31 04:36:54 -0800 | [diff] [blame] | 254 | mutex_unlock(&nf_ct_helper_mutex); |
| 255 | |
| 256 | /* Make sure every nothing is still using the helper unless its a |
| 257 | * connection in the hash. |
| 258 | */ |
| 259 | synchronize_rcu(); |
| 260 | |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 261 | rtnl_lock(); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 262 | spin_lock_bh(&nf_conntrack_lock); |
Alexey Dobriyan | 6804793 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 263 | for_each_net(net) |
| 264 | __nf_conntrack_helper_unregister(me, net); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 265 | spin_unlock_bh(&nf_conntrack_lock); |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 266 | rtnl_unlock(); |
Martin Josefsson | 7e5d03b | 2006-11-29 02:34:59 +0100 | [diff] [blame] | 267 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 268 | EXPORT_SYMBOL_GPL(nf_conntrack_helper_unregister); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 269 | |
Patrick McHardy | 61eb310 | 2007-07-07 22:27:06 -0700 | [diff] [blame] | 270 | static struct nf_ct_ext_type helper_extend __read_mostly = { |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 271 | .len = sizeof(struct nf_conn_help), |
| 272 | .align = __alignof__(struct nf_conn_help), |
| 273 | .id = NF_CT_EXT_HELPER, |
| 274 | }; |
| 275 | |
Al Viro | 8d4bc5b | 2007-07-20 16:15:28 +0100 | [diff] [blame] | 276 | int nf_conntrack_helper_init(void) |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 277 | { |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 278 | int err; |
| 279 | |
| 280 | nf_ct_helper_hsize = 1; /* gets rounded up to use one page */ |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 281 | nf_ct_helper_hash = nf_ct_alloc_hashtable(&nf_ct_helper_hsize, 0); |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 282 | if (!nf_ct_helper_hash) |
| 283 | return -ENOMEM; |
| 284 | |
| 285 | err = nf_ct_extend_register(&helper_extend); |
| 286 | if (err < 0) |
| 287 | goto err1; |
| 288 | |
| 289 | return 0; |
| 290 | |
| 291 | err1: |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 292 | nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize); |
Patrick McHardy | b8a7fe6 | 2007-07-07 22:36:46 -0700 | [diff] [blame] | 293 | return err; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Al Viro | 8d4bc5b | 2007-07-20 16:15:28 +0100 | [diff] [blame] | 296 | void nf_conntrack_helper_fini(void) |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 297 | { |
| 298 | nf_ct_extend_unregister(&helper_extend); |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 299 | nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 300 | } |