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