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 const struct xt_table nf_nat_ipv6_table = {
25 .valid_hooks = (1 << NF_INET_PRE_ROUTING) |
26 (1 << NF_INET_POST_ROUTING) |
27 (1 << NF_INET_LOCAL_OUT) |
28 (1 << NF_INET_LOCAL_IN),
33 static unsigned int ip6table_nat_do_chain(const struct nf_hook_ops *ops,
35 const struct nf_hook_state *state,
38 struct net *net = nf_ct_net(ct);
40 return ip6t_do_table(skb, ops->hooknum, state, net->ipv6.ip6table_nat);
43 static unsigned int ip6table_nat_fn(const struct nf_hook_ops *ops,
45 const struct nf_hook_state *state)
47 return nf_nat_ipv6_fn(ops, skb, state, ip6table_nat_do_chain);
50 static unsigned int ip6table_nat_in(const struct nf_hook_ops *ops,
52 const struct nf_hook_state *state)
54 return nf_nat_ipv6_in(ops, skb, state, ip6table_nat_do_chain);
57 static unsigned int ip6table_nat_out(const struct nf_hook_ops *ops,
59 const struct nf_hook_state *state)
61 return nf_nat_ipv6_out(ops, skb, state, ip6table_nat_do_chain);
64 static unsigned int ip6table_nat_local_fn(const struct nf_hook_ops *ops,
66 const struct nf_hook_state *state)
68 return nf_nat_ipv6_local_fn(ops, skb, state, ip6table_nat_do_chain);
71 static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = {
72 /* Before packet filtering, change destination */
74 .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,
85 .hooknum = NF_INET_POST_ROUTING,
86 .priority = NF_IP6_PRI_NAT_SRC,
88 /* Before packet filtering, change destination */
90 .hook = ip6table_nat_local_fn,
93 .hooknum = NF_INET_LOCAL_OUT,
94 .priority = NF_IP6_PRI_NAT_DST,
96 /* After packet filtering, change source */
98 .hook = ip6table_nat_fn,
101 .hooknum = NF_INET_LOCAL_IN,
102 .priority = NF_IP6_PRI_NAT_SRC,
106 static int __net_init ip6table_nat_net_init(struct net *net)
108 struct ip6t_replace *repl;
110 repl = ip6t_alloc_initial_table(&nf_nat_ipv6_table);
113 net->ipv6.ip6table_nat = ip6t_register_table(net, &nf_nat_ipv6_table, repl);
115 return PTR_ERR_OR_ZERO(net->ipv6.ip6table_nat);
118 static void __net_exit ip6table_nat_net_exit(struct net *net)
120 ip6t_unregister_table(net, net->ipv6.ip6table_nat);
123 static struct pernet_operations ip6table_nat_net_ops = {
124 .init = ip6table_nat_net_init,
125 .exit = ip6table_nat_net_exit,
128 static int __init ip6table_nat_init(void)
132 err = register_pernet_subsys(&ip6table_nat_net_ops);
136 err = nf_register_hooks(nf_nat_ipv6_ops, ARRAY_SIZE(nf_nat_ipv6_ops));
142 unregister_pernet_subsys(&ip6table_nat_net_ops);
147 static void __exit ip6table_nat_exit(void)
149 nf_unregister_hooks(nf_nat_ipv6_ops, ARRAY_SIZE(nf_nat_ipv6_ops));
150 unregister_pernet_subsys(&ip6table_nat_net_ops);
153 module_init(ip6table_nat_init);
154 module_exit(ip6table_nat_exit);
156 MODULE_LICENSE("GPL");