2 * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Based on Rusty Russell's IPv4 NAT code. Development of IPv6 NAT
12 #include <linux/module.h>
13 #include <linux/netfilter.h>
14 #include <linux/netfilter_ipv6.h>
15 #include <linux/netfilter_ipv6/ip6_tables.h>
16 #include <linux/ipv6.h>
19 #include <net/netfilter/nf_nat.h>
20 #include <net/netfilter/nf_nat_core.h>
21 #include <net/netfilter/nf_nat_l3proto.h>
23 static int __net_init ip6table_nat_table_init(struct net *net);
25 static const struct xt_table nf_nat_ipv6_table = {
27 .valid_hooks = (1 << NF_INET_PRE_ROUTING) |
28 (1 << NF_INET_POST_ROUTING) |
29 (1 << NF_INET_LOCAL_OUT) |
30 (1 << NF_INET_LOCAL_IN),
33 .table_init = ip6table_nat_table_init,
36 static unsigned int ip6table_nat_do_chain(void *priv,
38 const struct nf_hook_state *state,
41 return ip6t_do_table(skb, state, state->net->ipv6.ip6table_nat);
44 static unsigned int ip6table_nat_fn(void *priv,
46 const struct nf_hook_state *state)
48 return nf_nat_ipv6_fn(priv, skb, state, ip6table_nat_do_chain);
51 static unsigned int ip6table_nat_in(void *priv,
53 const struct nf_hook_state *state)
55 return nf_nat_ipv6_in(priv, skb, state, ip6table_nat_do_chain);
58 static unsigned int ip6table_nat_out(void *priv,
60 const struct nf_hook_state *state)
62 return nf_nat_ipv6_out(priv, skb, state, ip6table_nat_do_chain);
65 static unsigned int ip6table_nat_local_fn(void *priv,
67 const struct nf_hook_state *state)
69 return nf_nat_ipv6_local_fn(priv, skb, state, ip6table_nat_do_chain);
72 static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = {
73 /* Before packet filtering, change destination */
75 .hook = ip6table_nat_in,
77 .hooknum = NF_INET_PRE_ROUTING,
78 .priority = NF_IP6_PRI_NAT_DST,
80 /* After packet filtering, change source */
82 .hook = ip6table_nat_out,
84 .hooknum = NF_INET_POST_ROUTING,
85 .priority = NF_IP6_PRI_NAT_SRC,
87 /* Before packet filtering, change destination */
89 .hook = ip6table_nat_local_fn,
91 .hooknum = NF_INET_LOCAL_OUT,
92 .priority = NF_IP6_PRI_NAT_DST,
94 /* After packet filtering, change source */
96 .hook = ip6table_nat_fn,
98 .hooknum = NF_INET_LOCAL_IN,
99 .priority = NF_IP6_PRI_NAT_SRC,
103 static int __net_init ip6table_nat_table_init(struct net *net)
105 struct ip6t_replace *repl;
108 if (net->ipv6.ip6table_nat)
111 repl = ip6t_alloc_initial_table(&nf_nat_ipv6_table);
114 ret = ip6t_register_table(net, &nf_nat_ipv6_table, repl,
115 nf_nat_ipv6_ops, &net->ipv6.ip6table_nat);
120 static void __net_exit ip6table_nat_net_exit(struct net *net)
122 if (!net->ipv6.ip6table_nat)
124 ip6t_unregister_table(net, net->ipv6.ip6table_nat, nf_nat_ipv6_ops);
125 net->ipv6.ip6table_nat = NULL;
128 static struct pernet_operations ip6table_nat_net_ops = {
129 .exit = ip6table_nat_net_exit,
132 static int __init ip6table_nat_init(void)
134 int ret = register_pernet_subsys(&ip6table_nat_net_ops);
139 ret = ip6table_nat_table_init(&init_net);
141 unregister_pernet_subsys(&ip6table_nat_net_ops);
145 static void __exit ip6table_nat_exit(void)
147 unregister_pernet_subsys(&ip6table_nat_net_ops);
150 module_init(ip6table_nat_init);
151 module_exit(ip6table_nat_exit);
153 MODULE_LICENSE("GPL");