/* Masquerade. Simple mapping which alters range to a local IP address
(depending on route). */
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
*
* 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/inetdevice.h>
#include <linux/ip.h>
#include <linux/timer.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <net/protocol.h>
#include <net/ip.h>
#include <net/checksum.h>
#include <net/route.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/ipv4/nf_nat_masquerade.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("Xtables: automatic-address SNAT");
/* FIXME: Multiple targets. --RR */
static int masquerade_tg_check(const struct xt_tgchk_param *par)
{
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) {
pr_debug("bad MAP_IPS.\n");
return -EINVAL;
}
if (mr->rangesize != 1) {
pr_debug("bad rangesize %u\n", mr->rangesize);
return -EINVAL;
}
return 0;
}
static unsigned int
masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
struct nf_nat_range range;
const struct nf_nat_ipv4_multi_range_compat *mr;
mr = par->targinfo;
range.flags = mr->range[0].flags;
range.min_proto = mr->range[0].min;
range.max_proto = mr->range[0].max;
return nf_nat_masquerade_ipv4(skb, par->hooknum, &range, par->out);
}
static struct xt_target masquerade_tg_reg __read_mostly = {
.name = "MASQUERADE",
.family = NFPROTO_IPV4,
.target = masquerade_tg,
.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
.table = "nat",
.hooks = 1 << NF_INET_POST_ROUTING,
.checkentry = masquerade_tg_check,
.me = THIS_MODULE,
};
static int __init masquerade_tg_init(void)
{
int ret;
ret = xt_register_target(&masquerade_tg_reg);
if (ret == 0)
nf_nat_masquerade_ipv4_register_notifier();
return ret;
}
static void __exit masquerade_tg_exit(void)
{
xt_unregister_target(&masquerade_tg_reg);
nf_nat_masquerade_ipv4_unregister_notifier();
}
module_init(masquerade_tg_init);
module_exit(masquerade_tg_exit);
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