YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1 | /* netfilter.c: look after the filters for various protocols. |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 2 | * Heavily influenced by the old firewall.c by David Bonn and Alan Cox. |
| 3 | * |
| 4 | * Thanks to Rob `CmdrTaco' Malda for not influencing this code in any |
| 5 | * way. |
| 6 | * |
| 7 | * Rusty Russell (C)2000 -- This code is GPL. |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 8 | * Patrick McHardy (c) 2006-2012 |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 9 | */ |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 10 | #include <linux/kernel.h> |
| 11 | #include <linux/netfilter.h> |
| 12 | #include <net/protocol.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/wait.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/if.h> |
| 19 | #include <linux/netdevice.h> |
Florian Westphal | 5676864 | 2014-11-13 10:04:16 +0100 | [diff] [blame] | 20 | #include <linux/netfilter_ipv6.h> |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 21 | #include <linux/inetdevice.h> |
| 22 | #include <linux/proc_fs.h> |
Patrick McHardy | d486dd1 | 2007-02-12 11:09:55 -0800 | [diff] [blame] | 23 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 25 | #include <net/net_namespace.h> |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 26 | #include <net/sock.h> |
| 27 | |
| 28 | #include "nf_internals.h" |
| 29 | |
Patrick McHardy | d486dd1 | 2007-02-12 11:09:55 -0800 | [diff] [blame] | 30 | static DEFINE_MUTEX(afinfo_mutex); |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 31 | |
Arnd Bergmann | 0906a37 | 2010-03-09 20:59:15 +0100 | [diff] [blame] | 32 | const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO] __read_mostly; |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 33 | EXPORT_SYMBOL(nf_afinfo); |
Florian Westphal | 2a7851b | 2013-05-17 03:56:10 +0000 | [diff] [blame] | 34 | const struct nf_ipv6_ops __rcu *nf_ipv6_ops __read_mostly; |
| 35 | EXPORT_SYMBOL_GPL(nf_ipv6_ops); |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 36 | |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 37 | int nf_register_afinfo(const struct nf_afinfo *afinfo) |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 38 | { |
Pablo Neira Ayuso | 7926dbf | 2014-07-31 20:38:46 +0200 | [diff] [blame] | 39 | mutex_lock(&afinfo_mutex); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 40 | RCU_INIT_POINTER(nf_afinfo[afinfo->family], afinfo); |
Patrick McHardy | d486dd1 | 2007-02-12 11:09:55 -0800 | [diff] [blame] | 41 | mutex_unlock(&afinfo_mutex); |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 42 | return 0; |
| 43 | } |
| 44 | EXPORT_SYMBOL_GPL(nf_register_afinfo); |
| 45 | |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 46 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo) |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 47 | { |
Patrick McHardy | d486dd1 | 2007-02-12 11:09:55 -0800 | [diff] [blame] | 48 | mutex_lock(&afinfo_mutex); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 49 | RCU_INIT_POINTER(nf_afinfo[afinfo->family], NULL); |
Patrick McHardy | d486dd1 | 2007-02-12 11:09:55 -0800 | [diff] [blame] | 50 | mutex_unlock(&afinfo_mutex); |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 51 | synchronize_rcu(); |
| 52 | } |
| 53 | EXPORT_SYMBOL_GPL(nf_unregister_afinfo); |
| 54 | |
Jan Engelhardt | 7e9c6ee | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 55 | struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS] __read_mostly; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 56 | EXPORT_SYMBOL(nf_hooks); |
Eric Dumazet | a2d7ec5 | 2011-11-18 17:32:46 +0000 | [diff] [blame] | 57 | |
Zhouyi Zhou | d1c85c2 | 2014-08-22 10:40:15 +0800 | [diff] [blame] | 58 | #ifdef HAVE_JUMP_LABEL |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 59 | struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
Eric Dumazet | a2d7ec5 | 2011-11-18 17:32:46 +0000 | [diff] [blame] | 60 | EXPORT_SYMBOL(nf_hooks_needed); |
| 61 | #endif |
| 62 | |
Patrick McHardy | fd706d6 | 2007-02-12 11:10:14 -0800 | [diff] [blame] | 63 | static DEFINE_MUTEX(nf_hook_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 64 | |
| 65 | int nf_register_hook(struct nf_hook_ops *reg) |
| 66 | { |
Pablo Neira | e687ad6 | 2015-05-13 18:19:38 +0200 | [diff] [blame] | 67 | struct list_head *nf_hook_list; |
Li Zefan | 4c61097 | 2007-12-04 23:22:26 -0800 | [diff] [blame] | 68 | struct nf_hook_ops *elem; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 69 | |
Pablo Neira Ayuso | 7926dbf | 2014-07-31 20:38:46 +0200 | [diff] [blame] | 70 | mutex_lock(&nf_hook_mutex); |
Pablo Neira | e687ad6 | 2015-05-13 18:19:38 +0200 | [diff] [blame] | 71 | switch (reg->pf) { |
| 72 | case NFPROTO_NETDEV: |
| 73 | #ifdef CONFIG_NETFILTER_INGRESS |
| 74 | if (reg->hooknum == NF_NETDEV_INGRESS) { |
| 75 | BUG_ON(reg->dev == NULL); |
| 76 | nf_hook_list = ®->dev->nf_hooks_ingress; |
| 77 | net_inc_ingress_queue(); |
| 78 | break; |
| 79 | } |
| 80 | #endif |
| 81 | /* Fall through. */ |
| 82 | default: |
| 83 | nf_hook_list = &nf_hooks[reg->pf][reg->hooknum]; |
| 84 | break; |
| 85 | } |
| 86 | |
| 87 | list_for_each_entry(elem, nf_hook_list, list) { |
Li Zefan | 4c61097 | 2007-12-04 23:22:26 -0800 | [diff] [blame] | 88 | if (reg->priority < elem->priority) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 89 | break; |
| 90 | } |
Li Zefan | 4c61097 | 2007-12-04 23:22:26 -0800 | [diff] [blame] | 91 | list_add_rcu(®->list, elem->list.prev); |
Patrick McHardy | fd706d6 | 2007-02-12 11:10:14 -0800 | [diff] [blame] | 92 | mutex_unlock(&nf_hook_mutex); |
Zhouyi Zhou | d1c85c2 | 2014-08-22 10:40:15 +0800 | [diff] [blame] | 93 | #ifdef HAVE_JUMP_LABEL |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 94 | static_key_slow_inc(&nf_hooks_needed[reg->pf][reg->hooknum]); |
Eric Dumazet | a2d7ec5 | 2011-11-18 17:32:46 +0000 | [diff] [blame] | 95 | #endif |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 96 | return 0; |
| 97 | } |
| 98 | EXPORT_SYMBOL(nf_register_hook); |
| 99 | |
| 100 | void nf_unregister_hook(struct nf_hook_ops *reg) |
| 101 | { |
Patrick McHardy | fd706d6 | 2007-02-12 11:10:14 -0800 | [diff] [blame] | 102 | mutex_lock(&nf_hook_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 103 | list_del_rcu(®->list); |
Patrick McHardy | fd706d6 | 2007-02-12 11:10:14 -0800 | [diff] [blame] | 104 | mutex_unlock(&nf_hook_mutex); |
Pablo Neira | e687ad6 | 2015-05-13 18:19:38 +0200 | [diff] [blame] | 105 | switch (reg->pf) { |
| 106 | case NFPROTO_NETDEV: |
| 107 | #ifdef CONFIG_NETFILTER_INGRESS |
| 108 | if (reg->hooknum == NF_NETDEV_INGRESS) { |
| 109 | net_dec_ingress_queue(); |
| 110 | break; |
| 111 | } |
| 112 | break; |
| 113 | #endif |
| 114 | default: |
| 115 | break; |
| 116 | } |
Zhouyi Zhou | d1c85c2 | 2014-08-22 10:40:15 +0800 | [diff] [blame] | 117 | #ifdef HAVE_JUMP_LABEL |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 118 | static_key_slow_dec(&nf_hooks_needed[reg->pf][reg->hooknum]); |
Eric Dumazet | a2d7ec5 | 2011-11-18 17:32:46 +0000 | [diff] [blame] | 119 | #endif |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 120 | synchronize_net(); |
| 121 | } |
| 122 | EXPORT_SYMBOL(nf_unregister_hook); |
| 123 | |
Patrick McHardy | 972d1cb | 2006-04-06 14:09:12 -0700 | [diff] [blame] | 124 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n) |
| 125 | { |
| 126 | unsigned int i; |
| 127 | int err = 0; |
| 128 | |
| 129 | for (i = 0; i < n; i++) { |
| 130 | err = nf_register_hook(®[i]); |
| 131 | if (err) |
| 132 | goto err; |
| 133 | } |
| 134 | return err; |
| 135 | |
| 136 | err: |
| 137 | if (i > 0) |
| 138 | nf_unregister_hooks(reg, i); |
| 139 | return err; |
| 140 | } |
| 141 | EXPORT_SYMBOL(nf_register_hooks); |
| 142 | |
| 143 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n) |
| 144 | { |
Changli Gao | f68c530 | 2010-10-04 22:24:12 +0200 | [diff] [blame] | 145 | while (n-- > 0) |
| 146 | nf_unregister_hook(®[n]); |
Patrick McHardy | 972d1cb | 2006-04-06 14:09:12 -0700 | [diff] [blame] | 147 | } |
| 148 | EXPORT_SYMBOL(nf_unregister_hooks); |
| 149 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 150 | unsigned int nf_iterate(struct list_head *head, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 151 | struct sk_buff *skb, |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 152 | struct nf_hook_state *state, |
| 153 | struct nf_hook_ops **elemp) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 154 | { |
| 155 | unsigned int verdict; |
| 156 | |
| 157 | /* |
| 158 | * The caller must not block between calls to this |
| 159 | * function because of risk of continuing from deleted element. |
| 160 | */ |
Michael Wang | 2a6decf | 2012-08-22 19:59:57 +0000 | [diff] [blame] | 161 | list_for_each_entry_continue_rcu((*elemp), head, list) { |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 162 | if (state->thresh > (*elemp)->priority) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 163 | continue; |
| 164 | |
| 165 | /* Optimization: we don't need to hold module |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 166 | reference here, since function can't sleep. --RR */ |
Patrick McHardy | de9963f | 2011-02-14 17:35:07 +0100 | [diff] [blame] | 167 | repeat: |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 168 | verdict = (*elemp)->hook(*elemp, skb, state); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 169 | if (verdict != NF_ACCEPT) { |
| 170 | #ifdef CONFIG_NETFILTER_DEBUG |
| 171 | if (unlikely((verdict & NF_VERDICT_MASK) |
| 172 | > NF_MAX_VERDICT)) { |
| 173 | NFDEBUG("Evil return from %p(%u).\n", |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 174 | (*elemp)->hook, state->hook); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 175 | continue; |
| 176 | } |
| 177 | #endif |
Michael Wang | 2a6decf | 2012-08-22 19:59:57 +0000 | [diff] [blame] | 178 | if (verdict != NF_REPEAT) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 179 | return verdict; |
Patrick McHardy | de9963f | 2011-02-14 17:35:07 +0100 | [diff] [blame] | 180 | goto repeat; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 181 | } |
| 182 | } |
| 183 | return NF_ACCEPT; |
| 184 | } |
| 185 | |
| 186 | |
| 187 | /* Returns 1 if okfn() needs to be executed by the caller, |
| 188 | * -EPERM for NF_DROP, 0 otherwise. */ |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 189 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 190 | { |
Michael Wang | 2a6decf | 2012-08-22 19:59:57 +0000 | [diff] [blame] | 191 | struct nf_hook_ops *elem; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 192 | unsigned int verdict; |
| 193 | int ret = 0; |
| 194 | |
| 195 | /* We may already have this, but read-locks nest anyway */ |
| 196 | rcu_read_lock(); |
| 197 | |
Pablo Neira | f719148 | 2015-05-13 18:19:35 +0200 | [diff] [blame] | 198 | elem = list_entry_rcu(state->hook_list, struct nf_hook_ops, list); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 199 | next_hook: |
Pablo Neira | f719148 | 2015-05-13 18:19:35 +0200 | [diff] [blame] | 200 | verdict = nf_iterate(state->hook_list, skb, state, &elem); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 201 | if (verdict == NF_ACCEPT || verdict == NF_STOP) { |
| 202 | ret = 1; |
Eric Paris | da68365 | 2010-11-16 11:52:38 +0000 | [diff] [blame] | 203 | } else if ((verdict & NF_VERDICT_MASK) == NF_DROP) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 204 | kfree_skb(skb); |
Florian Westphal | f615df7 | 2011-01-18 15:52:14 +0100 | [diff] [blame] | 205 | ret = NF_DROP_GETERR(verdict); |
Eric Paris | da68365 | 2010-11-16 11:52:38 +0000 | [diff] [blame] | 206 | if (ret == 0) |
| 207 | ret = -EPERM; |
Patrick McHardy | f9c6399 | 2007-12-05 01:27:46 -0800 | [diff] [blame] | 208 | } else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) { |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 209 | int err = nf_queue(skb, elem, state, |
| 210 | verdict >> NF_VERDICT_QBITS); |
Florian Westphal | 563e123 | 2011-10-31 12:20:16 +0100 | [diff] [blame] | 211 | if (err < 0) { |
| 212 | if (err == -ECANCELED) |
Florian Westphal | 06cdb63 | 2011-01-18 15:28:38 +0100 | [diff] [blame] | 213 | goto next_hook; |
Florian Westphal | 563e123 | 2011-10-31 12:20:16 +0100 | [diff] [blame] | 214 | if (err == -ESRCH && |
Florian Westphal | 94b27cc | 2011-01-18 16:08:30 +0100 | [diff] [blame] | 215 | (verdict & NF_VERDICT_FLAG_QUEUE_BYPASS)) |
| 216 | goto next_hook; |
Florian Westphal | 06cdb63 | 2011-01-18 15:28:38 +0100 | [diff] [blame] | 217 | kfree_skb(skb); |
| 218 | } |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 219 | } |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 220 | rcu_read_unlock(); |
| 221 | return ret; |
| 222 | } |
| 223 | EXPORT_SYMBOL(nf_hook_slow); |
| 224 | |
| 225 | |
Herbert Xu | 37d4187 | 2007-10-14 00:39:18 -0700 | [diff] [blame] | 226 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 227 | { |
Herbert Xu | 37d4187 | 2007-10-14 00:39:18 -0700 | [diff] [blame] | 228 | if (writable_len > skb->len) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 229 | return 0; |
| 230 | |
| 231 | /* Not exclusive use of packet? Must copy. */ |
Herbert Xu | 37d4187 | 2007-10-14 00:39:18 -0700 | [diff] [blame] | 232 | if (!skb_cloned(skb)) { |
| 233 | if (writable_len <= skb_headlen(skb)) |
| 234 | return 1; |
| 235 | } else if (skb_clone_writable(skb, writable_len)) |
| 236 | return 1; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 237 | |
Herbert Xu | 37d4187 | 2007-10-14 00:39:18 -0700 | [diff] [blame] | 238 | if (writable_len <= skb_headlen(skb)) |
| 239 | writable_len = 0; |
| 240 | else |
| 241 | writable_len -= skb_headlen(skb); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 242 | |
Herbert Xu | 37d4187 | 2007-10-14 00:39:18 -0700 | [diff] [blame] | 243 | return !!__pskb_pull_tail(skb, writable_len); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 244 | } |
| 245 | EXPORT_SYMBOL(skb_make_writable); |
| 246 | |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 247 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 248 | /* This does not belong here, but locally generated errors need it if connection |
| 249 | tracking in use: without this, connection may not be in hash table, and hence |
| 250 | manufactured ICMP or RST packets will not be associated with it. */ |
Patrick McHardy | 312a0c16 | 2013-07-28 22:54:08 +0200 | [diff] [blame] | 251 | void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) |
| 252 | __rcu __read_mostly; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 253 | EXPORT_SYMBOL(ip_ct_attach); |
| 254 | |
Patrick McHardy | 312a0c16 | 2013-07-28 22:54:08 +0200 | [diff] [blame] | 255 | void nf_ct_attach(struct sk_buff *new, const struct sk_buff *skb) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 256 | { |
Patrick McHardy | 312a0c16 | 2013-07-28 22:54:08 +0200 | [diff] [blame] | 257 | void (*attach)(struct sk_buff *, const struct sk_buff *); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 258 | |
Patrick McHardy | c3a47ab | 2007-02-12 11:09:19 -0800 | [diff] [blame] | 259 | if (skb->nfct) { |
| 260 | rcu_read_lock(); |
| 261 | attach = rcu_dereference(ip_ct_attach); |
| 262 | if (attach) |
| 263 | attach(new, skb); |
| 264 | rcu_read_unlock(); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 265 | } |
| 266 | } |
| 267 | EXPORT_SYMBOL(nf_ct_attach); |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 268 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 269 | void (*nf_ct_destroy)(struct nf_conntrack *) __rcu __read_mostly; |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 270 | EXPORT_SYMBOL(nf_ct_destroy); |
| 271 | |
| 272 | void nf_conntrack_destroy(struct nf_conntrack *nfct) |
| 273 | { |
| 274 | void (*destroy)(struct nf_conntrack *); |
| 275 | |
| 276 | rcu_read_lock(); |
| 277 | destroy = rcu_dereference(nf_ct_destroy); |
| 278 | BUG_ON(destroy == NULL); |
| 279 | destroy(nfct); |
| 280 | rcu_read_unlock(); |
| 281 | } |
| 282 | EXPORT_SYMBOL(nf_conntrack_destroy); |
Pablo Neira Ayuso | 9cb0176 | 2012-06-07 12:13:39 +0200 | [diff] [blame] | 283 | |
Pablo Neira Ayuso | 5a05fae | 2012-06-20 20:50:31 +0200 | [diff] [blame] | 284 | struct nfq_ct_hook __rcu *nfq_ct_hook __read_mostly; |
Pablo Neira Ayuso | 9cb0176 | 2012-06-07 12:13:39 +0200 | [diff] [blame] | 285 | EXPORT_SYMBOL_GPL(nfq_ct_hook); |
| 286 | |
Pablo Neira Ayuso | d584a61 | 2012-06-20 20:52:31 +0200 | [diff] [blame] | 287 | struct nfq_ct_nat_hook __rcu *nfq_ct_nat_hook __read_mostly; |
| 288 | EXPORT_SYMBOL_GPL(nfq_ct_nat_hook); |
| 289 | |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 290 | #endif /* CONFIG_NF_CONNTRACK */ |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 291 | |
Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 292 | #ifdef CONFIG_NF_NAT_NEEDED |
| 293 | void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
| 294 | EXPORT_SYMBOL(nf_nat_decode_session_hook); |
| 295 | #endif |
| 296 | |
Gao feng | f3c1a44 | 2013-03-24 23:50:39 +0000 | [diff] [blame] | 297 | static int __net_init netfilter_net_init(struct net *net) |
| 298 | { |
| 299 | #ifdef CONFIG_PROC_FS |
| 300 | net->nf.proc_netfilter = proc_net_mkdir(net, "netfilter", |
| 301 | net->proc_net); |
Pablo Neira Ayuso | 12202fa | 2013-04-05 19:40:10 +0200 | [diff] [blame] | 302 | if (!net->nf.proc_netfilter) { |
| 303 | if (!net_eq(net, &init_net)) |
| 304 | pr_err("cannot create netfilter proc entry"); |
| 305 | |
Gao feng | f3c1a44 | 2013-03-24 23:50:39 +0000 | [diff] [blame] | 306 | return -ENOMEM; |
| 307 | } |
| 308 | #endif |
| 309 | return 0; |
| 310 | } |
| 311 | |
| 312 | static void __net_exit netfilter_net_exit(struct net *net) |
| 313 | { |
| 314 | remove_proc_entry("netfilter", net->proc_net); |
| 315 | } |
| 316 | |
| 317 | static struct pernet_operations netfilter_net_ops = { |
| 318 | .init = netfilter_net_init, |
| 319 | .exit = netfilter_net_exit, |
| 320 | }; |
| 321 | |
Pablo Neira Ayuso | 6d11cfd | 2013-05-22 22:42:36 +0000 | [diff] [blame] | 322 | int __init netfilter_init(void) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 323 | { |
Pablo Neira Ayuso | 6d11cfd | 2013-05-22 22:42:36 +0000 | [diff] [blame] | 324 | int i, h, ret; |
| 325 | |
Jan Engelhardt | 7e9c6ee | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 326 | for (i = 0; i < ARRAY_SIZE(nf_hooks); i++) { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 327 | for (h = 0; h < NF_MAX_HOOKS; h++) |
| 328 | INIT_LIST_HEAD(&nf_hooks[i][h]); |
| 329 | } |
| 330 | |
Pablo Neira Ayuso | 6d11cfd | 2013-05-22 22:42:36 +0000 | [diff] [blame] | 331 | ret = register_pernet_subsys(&netfilter_net_ops); |
| 332 | if (ret < 0) |
| 333 | goto err; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 334 | |
Pablo Neira Ayuso | 6d11cfd | 2013-05-22 22:42:36 +0000 | [diff] [blame] | 335 | ret = netfilter_log_init(); |
| 336 | if (ret < 0) |
| 337 | goto err_pernet; |
| 338 | |
| 339 | return 0; |
| 340 | err_pernet: |
| 341 | unregister_pernet_subsys(&netfilter_net_ops); |
| 342 | err: |
| 343 | return ret; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 344 | } |