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 net_device
*in
,
36 const struct net_device
*out
,
39 struct net
*net
= nf_ct_net(ct
);
41 return ip6t_do_table(skb
, ops
->hooknum
, in
, out
, net
->ipv6
.ip6table_nat
);
44 static unsigned int ip6table_nat_fn(const struct nf_hook_ops
*ops
,
46 const struct net_device
*in
,
47 const struct net_device
*out
,
48 int (*okfn
)(struct sk_buff
*))
50 return nf_nat_ipv6_fn(ops
, skb
, in
, out
, ip6table_nat_do_chain
);
53 static unsigned int ip6table_nat_in(const struct nf_hook_ops
*ops
,
55 const struct net_device
*in
,
56 const struct net_device
*out
,
57 int (*okfn
)(struct sk_buff
*))
59 return nf_nat_ipv6_in(ops
, skb
, in
, out
, ip6table_nat_do_chain
);
62 static unsigned int ip6table_nat_out(const struct nf_hook_ops
*ops
,
64 const struct net_device
*in
,
65 const struct net_device
*out
,
66 int (*okfn
)(struct sk_buff
*))
68 return nf_nat_ipv6_out(ops
, skb
, in
, out
, ip6table_nat_do_chain
);
71 static unsigned int ip6table_nat_local_fn(const struct nf_hook_ops
*ops
,
73 const struct net_device
*in
,
74 const struct net_device
*out
,
75 int (*okfn
)(struct sk_buff
*))
77 return nf_nat_ipv6_local_fn(ops
, skb
, in
, out
, ip6table_nat_do_chain
);
80 static struct nf_hook_ops nf_nat_ipv6_ops
[] __read_mostly
= {
81 /* Before packet filtering, change destination */
83 .hook
= ip6table_nat_in
,
86 .hooknum
= NF_INET_PRE_ROUTING
,
87 .priority
= NF_IP6_PRI_NAT_DST
,
89 /* After packet filtering, change source */
91 .hook
= ip6table_nat_out
,
94 .hooknum
= NF_INET_POST_ROUTING
,
95 .priority
= NF_IP6_PRI_NAT_SRC
,
97 /* Before packet filtering, change destination */
99 .hook
= ip6table_nat_local_fn
,
100 .owner
= THIS_MODULE
,
102 .hooknum
= NF_INET_LOCAL_OUT
,
103 .priority
= NF_IP6_PRI_NAT_DST
,
105 /* After packet filtering, change source */
107 .hook
= ip6table_nat_fn
,
108 .owner
= THIS_MODULE
,
110 .hooknum
= NF_INET_LOCAL_IN
,
111 .priority
= NF_IP6_PRI_NAT_SRC
,
115 static int __net_init
ip6table_nat_net_init(struct net
*net
)
117 struct ip6t_replace
*repl
;
119 repl
= ip6t_alloc_initial_table(&nf_nat_ipv6_table
);
122 net
->ipv6
.ip6table_nat
= ip6t_register_table(net
, &nf_nat_ipv6_table
, repl
);
124 return PTR_ERR_OR_ZERO(net
->ipv6
.ip6table_nat
);
127 static void __net_exit
ip6table_nat_net_exit(struct net
*net
)
129 ip6t_unregister_table(net
, net
->ipv6
.ip6table_nat
);
132 static struct pernet_operations ip6table_nat_net_ops
= {
133 .init
= ip6table_nat_net_init
,
134 .exit
= ip6table_nat_net_exit
,
137 static int __init
ip6table_nat_init(void)
141 err
= register_pernet_subsys(&ip6table_nat_net_ops
);
145 err
= nf_register_hooks(nf_nat_ipv6_ops
, ARRAY_SIZE(nf_nat_ipv6_ops
));
151 unregister_pernet_subsys(&ip6table_nat_net_ops
);
156 static void __exit
ip6table_nat_exit(void)
158 nf_unregister_hooks(nf_nat_ipv6_ops
, ARRAY_SIZE(nf_nat_ipv6_ops
));
159 unregister_pernet_subsys(&ip6table_nat_net_ops
);
162 module_init(ip6table_nat_init
);
163 module_exit(ip6table_nat_exit
);
165 MODULE_LICENSE("GPL");