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/* Kernel module to match MAC address parameters. */
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 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.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/etherdevice.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter/xt_mac.h>
#include <linux/netfilter/x_tables.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("Xtables: MAC address match");
MODULE_ALIAS("ipt_mac");
MODULE_ALIAS("ip6t_mac");
static bool
mac_mt(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, const struct xt_match *match,
const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop)
{
const struct xt_mac_info *info = matchinfo;
/* Is mac pointer valid? */
return skb_mac_header(skb) >= skb->head &&
skb_mac_header(skb) + ETH_HLEN <= skb->data
/* If so, compare... */
&& ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
^ info->invert);
}
static struct xt_match mac_mt_reg[] __read_mostly = {
{
.name = "mac",
.family = AF_INET,
.match = mac_mt,
.matchsize = sizeof(struct xt_mac_info),
.hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_FORWARD),
.me = THIS_MODULE,
},
{
.name = "mac",
.family = AF_INET6,
.match = mac_mt,
.matchsize = sizeof(struct xt_mac_info),
.hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_FORWARD),
.me = THIS_MODULE,
},
};
static int __init mac_mt_init(void)
{
return xt_register_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
}
static void __exit mac_mt_exit(void)
{
xt_unregister_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
}
module_init(mac_mt_init);
module_exit(mac_mt_exit);
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