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// SPDX-License-Identifier: GPL-2.0-only
/* Kernel module to match MAC address parameters. */
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/if_arp.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, struct xt_action_param *par)
{
const struct xt_mac_info *info = par->matchinfo;
bool ret;
if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER)
return false;
if (skb_mac_header(skb) < skb->head)
return false;
if (skb_mac_header(skb) + ETH_HLEN > skb->data)
return false;
ret = ether_addr_equal(eth_hdr(skb)->h_source, info->srcaddr);
ret ^= info->invert;
return ret;
}
static struct xt_match mac_mt_reg __read_mostly = {
.name = "mac",
.revision = 0,
.family = NFPROTO_UNSPEC,
.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_match(&mac_mt_reg);
}
static void __exit mac_mt_exit(void)
{
xt_unregister_match(&mac_mt_reg);
}
module_init(mac_mt_init);
module_exit(mac_mt_exit);
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