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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
masquerade_tg6(struct sk_buff * skb,const struct xt_action_param * par)25 masquerade_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 
masquerade_tg6_checkentry(const struct xt_tgchk_param * par)30 static 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 
39 static 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 
masquerade_tg6_init(void)50 static 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 }
masquerade_tg6_exit(void)60 static void __exit masquerade_tg6_exit(void)
61 {
62 	nf_nat_masquerade_ipv6_unregister_notifier();
63 	xt_unregister_target(&masquerade_tg6_reg);
64 }
65 
66 module_init(masquerade_tg6_init);
67 module_exit(masquerade_tg6_exit);
68 
69 MODULE_LICENSE("GPL");
70 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
71 MODULE_DESCRIPTION("Xtables: automatic address SNAT");
72