/* 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/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 mac_match = {	.name		= "mac",	.match		= match,	.matchsize	= sizeof(struct xt_mac_info),	.hooks		= (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) |			  (1 << NF_IP_FORWARD),	.family		= AF_INET,	.me		= THIS_MODULE,};static struct xt_match mac6_match = {	.name		= "mac",	.match		= match,	.matchsize	= sizeof(struct xt_mac_info),	.hooks		= (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) |			  (1 << NF_IP_FORWARD),	.family		= AF_INET6,	.me		= THIS_MODULE,}; static int __init xt_mac_init(void){	int ret;	ret = xt_register_match(&mac_match);	if (ret)		return ret; 	ret = xt_register_match(&mac6_match);	if (ret)		xt_unregister_match(&mac_match); 	return ret;} static void __exit xt_mac_fini(void){	xt_unregister_match(&mac_match);	xt_unregister_match(&mac6_match);} module_init(xt_mac_init);module_exit(xt_mac_fini);