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58a317f1 PM |
1 | /* |
2 | * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> | |
3 | * | |
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. | |
7 | * | |
8 | * Based on Rusty Russell's IPv4 NAT code. Development of IPv6 NAT | |
9 | * funded by Astaro. | |
10 | */ | |
11 | ||
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> | |
17 | #include <net/ipv6.h> | |
18 | ||
19 | #include <net/netfilter/nf_nat.h> | |
20 | #include <net/netfilter/nf_nat_core.h> | |
21 | #include <net/netfilter/nf_nat_l3proto.h> | |
22 | ||
23 | static const struct xt_table nf_nat_ipv6_table = { | |
24 | .name = "nat", | |
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), | |
29 | .me = THIS_MODULE, | |
30 | .af = NFPROTO_IPV6, | |
31 | }; | |
32 | ||
2a5538e9 PNA |
33 | static unsigned int ip6table_nat_do_chain(const struct nf_hook_ops *ops, |
34 | struct sk_buff *skb, | |
35 | const struct net_device *in, | |
36 | const struct net_device *out, | |
37 | struct nf_conn *ct) | |
58a317f1 PM |
38 | { |
39 | struct net *net = nf_ct_net(ct); | |
58a317f1 | 40 | |
2a5538e9 | 41 | return ip6t_do_table(skb, ops->hooknum, in, out, net->ipv6.ip6table_nat); |
58a317f1 PM |
42 | } |
43 | ||
2a5538e9 PNA |
44 | static unsigned int ip6table_nat_fn(const struct nf_hook_ops *ops, |
45 | struct sk_buff *skb, | |
46 | const struct net_device *in, | |
47 | const struct net_device *out, | |
48 | int (*okfn)(struct sk_buff *)) | |
58a317f1 | 49 | { |
2a5538e9 | 50 | return nf_nat_ipv6_fn(ops, skb, in, out, ip6table_nat_do_chain); |
58a317f1 PM |
51 | } |
52 | ||
2a5538e9 PNA |
53 | static unsigned int ip6table_nat_in(const struct nf_hook_ops *ops, |
54 | struct sk_buff *skb, | |
55 | const struct net_device *in, | |
56 | const struct net_device *out, | |
57 | int (*okfn)(struct sk_buff *)) | |
58a317f1 | 58 | { |
2a5538e9 | 59 | return nf_nat_ipv6_in(ops, skb, in, out, ip6table_nat_do_chain); |
58a317f1 PM |
60 | } |
61 | ||
2a5538e9 PNA |
62 | static unsigned int ip6table_nat_out(const struct nf_hook_ops *ops, |
63 | struct sk_buff *skb, | |
64 | const struct net_device *in, | |
65 | const struct net_device *out, | |
66 | int (*okfn)(struct sk_buff *)) | |
58a317f1 | 67 | { |
2a5538e9 | 68 | return nf_nat_ipv6_out(ops, skb, in, out, ip6table_nat_do_chain); |
58a317f1 PM |
69 | } |
70 | ||
2a5538e9 PNA |
71 | static unsigned int ip6table_nat_local_fn(const struct nf_hook_ops *ops, |
72 | struct sk_buff *skb, | |
73 | const struct net_device *in, | |
74 | const struct net_device *out, | |
75 | int (*okfn)(struct sk_buff *)) | |
58a317f1 | 76 | { |
2a5538e9 | 77 | return nf_nat_ipv6_local_fn(ops, skb, in, out, ip6table_nat_do_chain); |
58a317f1 PM |
78 | } |
79 | ||
80 | static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = { | |
81 | /* Before packet filtering, change destination */ | |
82 | { | |
2a5538e9 | 83 | .hook = ip6table_nat_in, |
58a317f1 PM |
84 | .owner = THIS_MODULE, |
85 | .pf = NFPROTO_IPV6, | |
86 | .hooknum = NF_INET_PRE_ROUTING, | |
87 | .priority = NF_IP6_PRI_NAT_DST, | |
88 | }, | |
89 | /* After packet filtering, change source */ | |
90 | { | |
2a5538e9 | 91 | .hook = ip6table_nat_out, |
58a317f1 PM |
92 | .owner = THIS_MODULE, |
93 | .pf = NFPROTO_IPV6, | |
94 | .hooknum = NF_INET_POST_ROUTING, | |
95 | .priority = NF_IP6_PRI_NAT_SRC, | |
96 | }, | |
97 | /* Before packet filtering, change destination */ | |
98 | { | |
2a5538e9 | 99 | .hook = ip6table_nat_local_fn, |
58a317f1 PM |
100 | .owner = THIS_MODULE, |
101 | .pf = NFPROTO_IPV6, | |
102 | .hooknum = NF_INET_LOCAL_OUT, | |
103 | .priority = NF_IP6_PRI_NAT_DST, | |
104 | }, | |
105 | /* After packet filtering, change source */ | |
106 | { | |
2a5538e9 | 107 | .hook = ip6table_nat_fn, |
58a317f1 PM |
108 | .owner = THIS_MODULE, |
109 | .pf = NFPROTO_IPV6, | |
110 | .hooknum = NF_INET_LOCAL_IN, | |
111 | .priority = NF_IP6_PRI_NAT_SRC, | |
112 | }, | |
113 | }; | |
114 | ||
115 | static int __net_init ip6table_nat_net_init(struct net *net) | |
116 | { | |
117 | struct ip6t_replace *repl; | |
118 | ||
119 | repl = ip6t_alloc_initial_table(&nf_nat_ipv6_table); | |
120 | if (repl == NULL) | |
121 | return -ENOMEM; | |
122 | net->ipv6.ip6table_nat = ip6t_register_table(net, &nf_nat_ipv6_table, repl); | |
123 | kfree(repl); | |
8c6ffba0 | 124 | return PTR_ERR_OR_ZERO(net->ipv6.ip6table_nat); |
58a317f1 PM |
125 | } |
126 | ||
127 | static void __net_exit ip6table_nat_net_exit(struct net *net) | |
128 | { | |
129 | ip6t_unregister_table(net, net->ipv6.ip6table_nat); | |
130 | } | |
131 | ||
132 | static struct pernet_operations ip6table_nat_net_ops = { | |
133 | .init = ip6table_nat_net_init, | |
134 | .exit = ip6table_nat_net_exit, | |
135 | }; | |
136 | ||
137 | static int __init ip6table_nat_init(void) | |
138 | { | |
139 | int err; | |
140 | ||
141 | err = register_pernet_subsys(&ip6table_nat_net_ops); | |
142 | if (err < 0) | |
143 | goto err1; | |
144 | ||
145 | err = nf_register_hooks(nf_nat_ipv6_ops, ARRAY_SIZE(nf_nat_ipv6_ops)); | |
146 | if (err < 0) | |
147 | goto err2; | |
148 | return 0; | |
149 | ||
150 | err2: | |
151 | unregister_pernet_subsys(&ip6table_nat_net_ops); | |
152 | err1: | |
153 | return err; | |
154 | } | |
155 | ||
156 | static void __exit ip6table_nat_exit(void) | |
157 | { | |
158 | nf_unregister_hooks(nf_nat_ipv6_ops, ARRAY_SIZE(nf_nat_ipv6_ops)); | |
159 | unregister_pernet_subsys(&ip6table_nat_net_ops); | |
160 | } | |
161 | ||
162 | module_init(ip6table_nat_init); | |
163 | module_exit(ip6table_nat_exit); | |
164 | ||
165 | MODULE_LICENSE("GPL"); |