/* (C) 1999-2001 Michal Ludvig <michal@logix.cz> * * 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/if_packet.h>#include <linux/netfilter_ipv4/ipt_pkttype.h>#include <linux/netfilter_ipv4/ip_tables.h>MODULE_LICENSE("GPL");MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");MODULE_DESCRIPTION("IP tables match to match on linklayer packet type");static int match(const struct sk_buff *skb,      const struct net_device *in,      const struct net_device *out,      const void *matchinfo,      int offset,      int *hotdrop){    const struct ipt_pkttype_info *info = matchinfo;    return (skb->pkt_type == info->pkttype) ^ info->invert;}static int checkentry(const char *tablename,		   const struct ipt_ip *ip,		   void *matchinfo,		   unsigned int matchsize,		   unsigned int hook_mask){/*	if (hook_mask	    & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN)		| (1 << NF_IP_FORWARD))) {		printk("ipt_pkttype: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");		return 0;	}*/	if (matchsize != IPT_ALIGN(sizeof(struct ipt_pkttype_info)))		return 0;	return 1;}static struct ipt_match pkttype_match = {	.name		= "pkttype",	.match		= &match,	.checkentry	= &checkentry,	.me		= THIS_MODULE,};static int __init init(void){	return ipt_register_match(&pkttype_match);}static void __exit fini(void){	ipt_unregister_match(&pkttype_match);}module_init(init);module_exit(fini);