/* 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 intmatch(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,      int *hotdrop){    const struct xt_mac_info *info = matchinfo;     /* Is mac pointer valid? */    return (skb->mac.raw >= skb->head	    && (skb->mac.raw + ETH_HLEN) <= skb->data	    /* If so, compare... */	    && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))		^ info->invert));} static struct xt_match xt_mac_match[] = {	{		.name		= "mac",		.family		= AF_INET,		.match		= match,		.matchsize	= sizeof(struct xt_mac_info),		.hooks		= (1 << NF_IP_PRE_ROUTING) |				  (1 << NF_IP_LOCAL_IN) |				  (1 << NF_IP_FORWARD),		.me		= THIS_MODULE,	},	{		.name		= "mac",		.family		= AF_INET6,		.match		= match,		.matchsize	= sizeof(struct xt_mac_info),		.hooks		= (1 << NF_IP6_PRE_ROUTING) |				  (1 << NF_IP6_LOCAL_IN) |				  (1 << NF_IP6_FORWARD),		.me		= THIS_MODULE,	},}; static int __init xt_mac_init(void){	return xt_register_matches(xt_mac_match, ARRAY_SIZE(xt_mac_match));} static void __exit xt_mac_fini(void){	xt_unregister_matches(xt_mac_match, ARRAY_SIZE(xt_mac_match));} module_init(xt_mac_init);module_exit(xt_mac_fini);