2014-09-08 13:45:00 +02:00
|
|
|
/*
|
|
|
|
* Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
|
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/netlink.h>
|
|
|
|
#include <linux/netfilter.h>
|
|
|
|
#include <linux/netfilter/nf_tables.h>
|
|
|
|
#include <net/netfilter/nf_tables.h>
|
|
|
|
#include <net/netfilter/nft_masq.h>
|
|
|
|
#include <net/netfilter/ipv4/nf_nat_masquerade.h>
|
|
|
|
|
|
|
|
static void nft_masq_ipv4_eval(const struct nft_expr *expr,
|
|
|
|
struct nft_data data[NFT_REG_MAX + 1],
|
|
|
|
const struct nft_pktinfo *pkt)
|
|
|
|
{
|
|
|
|
struct nft_masq *priv = nft_expr_priv(expr);
|
|
|
|
struct nf_nat_range range;
|
|
|
|
unsigned int verdict;
|
|
|
|
|
|
|
|
range.flags = priv->flags;
|
|
|
|
|
|
|
|
verdict = nf_nat_masquerade_ipv4(pkt->skb, pkt->ops->hooknum,
|
|
|
|
&range, pkt->out);
|
|
|
|
|
|
|
|
data[NFT_REG_VERDICT].verdict = verdict;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nft_expr_type nft_masq_ipv4_type;
|
|
|
|
static const struct nft_expr_ops nft_masq_ipv4_ops = {
|
|
|
|
.type = &nft_masq_ipv4_type,
|
|
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
|
|
|
|
.eval = nft_masq_ipv4_eval,
|
2014-10-03 14:13:36 +02:00
|
|
|
.init = nft_masq_init,
|
2014-09-08 13:45:00 +02:00
|
|
|
.dump = nft_masq_dump,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct nft_expr_type nft_masq_ipv4_type __read_mostly = {
|
|
|
|
.family = NFPROTO_IPV4,
|
|
|
|
.name = "masq",
|
|
|
|
.ops = &nft_masq_ipv4_ops,
|
|
|
|
.policy = nft_masq_policy,
|
|
|
|
.maxattr = NFTA_MASQ_MAX,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init nft_masq_ipv4_module_init(void)
|
|
|
|
{
|
2014-10-03 14:13:36 +02:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = nft_register_expr(&nft_masq_ipv4_type);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
nf_nat_masquerade_ipv4_register_notifier();
|
|
|
|
|
|
|
|
return ret;
|
2014-09-08 13:45:00 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit nft_masq_ipv4_module_exit(void)
|
|
|
|
{
|
|
|
|
nft_unregister_expr(&nft_masq_ipv4_type);
|
2014-10-03 14:13:36 +02:00
|
|
|
nf_nat_masquerade_ipv4_unregister_notifier();
|
2014-09-08 13:45:00 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(nft_masq_ipv4_module_init);
|
|
|
|
module_exit(nft_masq_ipv4_module_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
|
|
|
|
MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "masq");
|