| /* |
| * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * Based on Rusty Russell's IPv6 MASQUERADE target. Development of IPv6 |
| * NAT funded by Astaro. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/netdevice.h> |
| #include <linux/ipv6.h> |
| #include <linux/netfilter.h> |
| #include <linux/netfilter_ipv6.h> |
| #include <linux/netfilter/x_tables.h> |
| #include <net/netfilter/nf_nat.h> |
| #include <net/addrconf.h> |
| #include <net/ipv6.h> |
| #include <net/netfilter/ipv6/nf_nat_masquerade.h> |
| |
| static unsigned int |
| masquerade_tg6(struct sk_buff *skb, const struct xt_action_param *par) |
| { |
| return nf_nat_masquerade_ipv6(skb, par->targinfo, xt_out(par)); |
| } |
| |
| static int masquerade_tg6_checkentry(const struct xt_tgchk_param *par) |
| { |
| const struct nf_nat_range2 *range = par->targinfo; |
| |
| if (range->flags & NF_NAT_RANGE_MAP_IPS) |
| return -EINVAL; |
| return nf_ct_netns_get(par->net, par->family); |
| } |
| |
| static void masquerade_tg6_destroy(const struct xt_tgdtor_param *par) |
| { |
| nf_ct_netns_put(par->net, par->family); |
| } |
| |
| static struct xt_target masquerade_tg6_reg __read_mostly = { |
| .name = "MASQUERADE", |
| .family = NFPROTO_IPV6, |
| .checkentry = masquerade_tg6_checkentry, |
| .destroy = masquerade_tg6_destroy, |
| .target = masquerade_tg6, |
| .targetsize = sizeof(struct nf_nat_range), |
| .table = "nat", |
| .hooks = 1 << NF_INET_POST_ROUTING, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init masquerade_tg6_init(void) |
| { |
| int err; |
| |
| err = xt_register_target(&masquerade_tg6_reg); |
| if (err) |
| return err; |
| |
| err = nf_nat_masquerade_ipv6_register_notifier(); |
| if (err) |
| xt_unregister_target(&masquerade_tg6_reg); |
| |
| return err; |
| } |
| static void __exit masquerade_tg6_exit(void) |
| { |
| nf_nat_masquerade_ipv6_unregister_notifier(); |
| xt_unregister_target(&masquerade_tg6_reg); |
| } |
| |
| module_init(masquerade_tg6_init); |
| module_exit(masquerade_tg6_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| MODULE_DESCRIPTION("Xtables: automatic address SNAT"); |