/* Hop Limit matching module *//* (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv> * Based on HW's ttl module * * 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/netfilter_ipv6/ip6t_hl.h>#include <linux/netfilter_ipv6/ip6_tables.h>MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");MODULE_DESCRIPTION("IP tables Hop Limit matching module");MODULE_LICENSE("GPL");static int match(const struct sk_buff *skb, const struct net_device *in,		 const struct net_device *out, const void *matchinfo,		 int offset, const void *hdr, u_int16_t datalen,		 int *hotdrop){	const struct ip6t_hl_info *info = matchinfo;	const struct ipv6hdr *ip6h = skb->nh.ipv6h;	switch (info->mode) {		case IP6T_HL_EQ:			return (ip6h->hop_limit == info->hop_limit);			break;		case IP6T_HL_NE:			return (!(ip6h->hop_limit == info->hop_limit));			break;		case IP6T_HL_LT:			return (ip6h->hop_limit < info->hop_limit);			break;		case IP6T_HL_GT:			return (ip6h->hop_limit > info->hop_limit);			break;		default:			printk(KERN_WARNING "ip6t_hl: unknown mode %d\n", 				info->mode);			return 0;	}	return 0;}static int checkentry(const char *tablename, const struct ip6t_ip6 *ip,		      void *matchinfo, unsigned int matchsize,		      unsigned int hook_mask){	if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_hl_info)))		return 0;	return 1;}static struct ip6t_match hl_match = {	.name		= "hl",	.match		= &match,	.checkentry	= &checkentry,	.me		= THIS_MODULE,};static int __init init(void){	return ip6t_register_match(&hl_match);}static void __exit fini(void){	ip6t_unregister_match(&hl_match);}module_init(init);module_exit(fini);