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");