[mirror_ubuntu-bionic-kernel.git] / net / netfilter / xt_mac.c

/* 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("iptables mac matching module");
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);
Commit	Line	Data
1da177e4 LT	1	/* Kernel module to match MAC address parameters. */
	2
	3	/* (C) 1999-2001 Paul `Rusty' Russell
	4	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/skbuff.h>
	13	#include <linux/if_ether.h>
d3f4a687	14	#include <linux/etherdevice.h>
1da177e4	15
2e4e6a17	16	#include <linux/netfilter_ipv4.h>
891350c9	17	#include <linux/netfilter_ipv6.h>
2e4e6a17 HW	18	#include <linux/netfilter/xt_mac.h>
2e4e6a17 HW	19	#include <linux/netfilter/x_tables.h>
1da177e4 LT	20
	21	MODULE_LICENSE("GPL");
	22	MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
	23	MODULE_DESCRIPTION("iptables mac matching module");
2e4e6a17 HW	24	MODULE_ALIAS("ipt_mac");
2e4e6a17 HW	25	MODULE_ALIAS("ip6t_mac");
1da177e4	26
1d93a9cb	27	static bool
d3c5ee6d JE	28	mac_mt(const struct sk_buff skb, const struct net_device in,
	29	const struct net_device out, const struct xt_match match,
	30	const void matchinfo, int offset, unsigned int protoff, bool hotdrop)
1da177e4	31	{
2e4e6a17	32	const struct xt_mac_info *info = matchinfo;
1da177e4 LT	33
1da177e4 LT	34	/* Is mac pointer valid? */
7c4e36bc JE	35	return skb_mac_header(skb) >= skb->head &&
	36	skb_mac_header(skb) + ETH_HLEN <= skb->data
	37	/* If so, compare... */
	38	&& ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
	39	^ info->invert);
1da177e4 LT	40	}
1da177e4 LT	41
d3c5ee6d	42	static struct xt_match mac_mt_reg[] __read_mostly = {
4470bbc7 PM	43	{
	44	.name = "mac",
	45	.family = AF_INET,
d3c5ee6d	46	.match = mac_mt,
4470bbc7	47	.matchsize = sizeof(struct xt_mac_info),
6e23ae2a PM	48	.hooks = (1 << NF_INET_PRE_ROUTING) \|
	49	(1 << NF_INET_LOCAL_IN) \|
	50	(1 << NF_INET_FORWARD),
4470bbc7 PM	51	.me = THIS_MODULE,
	52	},
	53	{
	54	.name = "mac",
	55	.family = AF_INET6,
d3c5ee6d	56	.match = mac_mt,
4470bbc7	57	.matchsize = sizeof(struct xt_mac_info),
6e23ae2a PM	58	.hooks = (1 << NF_INET_PRE_ROUTING) \|
	59	(1 << NF_INET_LOCAL_IN) \|
	60	(1 << NF_INET_FORWARD),
4470bbc7 PM	61	.me = THIS_MODULE,
4470bbc7 PM	62	},
1da177e4 LT	63	};
1da177e4 LT	64
d3c5ee6d	65	static int __init mac_mt_init(void)
1da177e4	66	{
d3c5ee6d	67	return xt_register_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
1da177e4 LT	68	}
1da177e4 LT	69
d3c5ee6d	70	static void __exit mac_mt_exit(void)
1da177e4	71	{
d3c5ee6d	72	xt_unregister_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
1da177e4 LT	73	}
1da177e4 LT	74
d3c5ee6d JE	75	module_init(mac_mt_init);
d3c5ee6d JE	76	module_exit(mac_mt_exit);