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b3f644fc 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 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> | |
be6b635c | 22 | #include <net/netfilter/ipv6/nf_nat_masquerade.h> |
b3f644fc PM |
23 | |
24 | static unsigned int | |
25 | masquerade_tg6(struct sk_buff *skb, const struct xt_action_param *par) | |
26 | { | |
613dbd95 | 27 | return nf_nat_masquerade_ipv6(skb, par->targinfo, xt_out(par)); |
b3f644fc PM |
28 | } |
29 | ||
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 | ||
b3f644fc PM |
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 | ||
50 | static int __init masquerade_tg6_init(void) | |
51 | { | |
52 | int err; | |
53 | ||
54 | err = xt_register_target(&masquerade_tg6_reg); | |
be6b635c AB |
55 | if (err == 0) |
56 | nf_nat_masquerade_ipv6_register_notifier(); | |
b3f644fc PM |
57 | |
58 | return err; | |
59 | } | |
60 | static void __exit masquerade_tg6_exit(void) | |
61 | { | |
be6b635c | 62 | nf_nat_masquerade_ipv6_unregister_notifier(); |
b3f644fc PM |
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"); |