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
24static unsigned int
25masquerade_tg6(struct sk_buff *skb, const struct xt_action_param *par)
26{
27	return nf_nat_masquerade_ipv6(skb, par->targinfo, par->out);
28}
29
30static int masquerade_tg6_checkentry(const struct xt_tgchk_param *par)
31{
32	const struct nf_nat_range *range = par->targinfo;
33
34	if (range->flags & NF_NAT_RANGE_MAP_IPS)
35		return -EINVAL;
36	return 0;
37}
38
39static struct xt_target masquerade_tg6_reg __read_mostly = {
40	.name		= "MASQUERADE",
41	.family		= NFPROTO_IPV6,
42	.checkentry	= masquerade_tg6_checkentry,
43	.target		= masquerade_tg6,
44	.targetsize	= sizeof(struct nf_nat_range),
45	.table		= "nat",
46	.hooks		= 1 << NF_INET_POST_ROUTING,
47	.me		= THIS_MODULE,
48};
49
50static int __init masquerade_tg6_init(void)
51{
52	int err;
53
54	err = xt_register_target(&masquerade_tg6_reg);
55	if (err == 0)
56		nf_nat_masquerade_ipv6_register_notifier();
57
58	return err;
59}
60static void __exit masquerade_tg6_exit(void)
61{
62	nf_nat_masquerade_ipv6_unregister_notifier();
63	xt_unregister_target(&masquerade_tg6_reg);
64}
65
66module_init(masquerade_tg6_init);
67module_exit(masquerade_tg6_exit);
68
69MODULE_LICENSE("GPL");
70MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
71MODULE_DESCRIPTION("Xtables: automatic address SNAT");
72