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 IPv6 MASQUERADE target. Development of IPv6
9 * NAT funded by Astaro.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/netdevice.h>
15 #include <linux/ipv6.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter_ipv6.h>
18 #include <linux/netfilter/x_tables.h>
19 #include <net/netfilter/nf_nat.h>
20 #include <net/addrconf.h>
21 #include <net/ipv6.h>
22 #include <net/netfilter/ipv6/nf_nat_masquerade.h>
23
24 static unsigned int
25 masquerade_tg6(struct sk_buff *skb, const struct xt_action_param *par)
26 {
27 return nf_nat_masquerade_ipv6(skb, par->targinfo, xt_out(par));
28 }
29
30 static int masquerade_tg6_checkentry(const struct xt_tgchk_param *par)
31 {
32 const struct nf_nat_range2 *range = par->targinfo;
33
34 if (range->flags & NF_NAT_RANGE_MAP_IPS)
35 return -EINVAL;
36 return nf_ct_netns_get(par->net, par->family);
37 }
38
39 static void masquerade_tg6_destroy(const struct xt_tgdtor_param *par)
40 {
41 nf_ct_netns_put(par->net, par->family);
42 }
43
44 static struct xt_target masquerade_tg6_reg __read_mostly = {
45 .name = "MASQUERADE",
46 .family = NFPROTO_IPV6,
47 .checkentry = masquerade_tg6_checkentry,
48 .destroy = masquerade_tg6_destroy,
49 .target = masquerade_tg6,
50 .targetsize = sizeof(struct nf_nat_range),
51 .table = "nat",
52 .hooks = 1 << NF_INET_POST_ROUTING,
53 .me = THIS_MODULE,
54 };
55
56 static int __init masquerade_tg6_init(void)
57 {
58 int err;
59
60 err = xt_register_target(&masquerade_tg6_reg);
61 if (err)
62 return err;
63
64 err = nf_nat_masquerade_ipv6_register_notifier();
65 if (err)
66 xt_unregister_target(&masquerade_tg6_reg);
67
68 return err;
69 }
70 static void __exit masquerade_tg6_exit(void)
71 {
72 nf_nat_masquerade_ipv6_unregister_notifier();
73 xt_unregister_target(&masquerade_tg6_reg);
74 }
75
76 module_init(masquerade_tg6_init);
77 module_exit(masquerade_tg6_exit);
78
79 MODULE_LICENSE("GPL");
80 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
81 MODULE_DESCRIPTION("Xtables: automatic address SNAT");
82
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