2005-04-16 22:20:36 +00:00
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/* Hop Limit matching module */
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/* (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv>
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* Based on HW's ttl module
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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2007-02-07 23:11:19 +00:00
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#include <linux/ipv6.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter_ipv6/ip6t_hl.h>
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2007-02-07 23:11:19 +00:00
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#include <linux/netfilter/x_tables.h>
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2005-04-16 22:20:36 +00:00
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MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");
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2008-01-15 07:42:28 +00:00
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MODULE_DESCRIPTION("Xtables: IPv6 Hop Limit field match");
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2005-04-16 22:20:36 +00:00
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MODULE_LICENSE("GPL");
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2007-12-05 07:24:03 +00:00
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static bool
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hl_mt6(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop)
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2005-04-16 22:20:36 +00:00
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{
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const struct ip6t_hl_info *info = matchinfo;
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2007-04-26 00:54:47 +00:00
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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2005-04-16 22:20:36 +00:00
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switch (info->mode) {
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case IP6T_HL_EQ:
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2007-07-08 05:19:08 +00:00
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return ip6h->hop_limit == info->hop_limit;
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2005-04-16 22:20:36 +00:00
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break;
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case IP6T_HL_NE:
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2007-07-08 05:19:08 +00:00
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return ip6h->hop_limit != info->hop_limit;
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2005-04-16 22:20:36 +00:00
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break;
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case IP6T_HL_LT:
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2007-07-08 05:19:08 +00:00
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return ip6h->hop_limit < info->hop_limit;
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2005-04-16 22:20:36 +00:00
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break;
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case IP6T_HL_GT:
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2007-07-08 05:19:08 +00:00
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return ip6h->hop_limit > info->hop_limit;
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2005-04-16 22:20:36 +00:00
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break;
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default:
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2007-02-09 14:24:49 +00:00
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printk(KERN_WARNING "ip6t_hl: unknown mode %d\n",
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2005-04-16 22:20:36 +00:00
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info->mode);
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2007-07-08 05:15:35 +00:00
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return false;
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2005-04-16 22:20:36 +00:00
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}
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2007-07-08 05:15:35 +00:00
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return false;
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2005-04-16 22:20:36 +00:00
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}
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2007-12-05 07:24:03 +00:00
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static struct xt_match hl_mt6_reg __read_mostly = {
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2005-04-16 22:20:36 +00:00
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.name = "hl",
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2007-02-07 23:11:19 +00:00
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.family = AF_INET6,
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2007-12-05 07:24:03 +00:00
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.match = hl_mt6,
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2006-03-21 02:01:43 +00:00
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.matchsize = sizeof(struct ip6t_hl_info),
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2005-04-16 22:20:36 +00:00
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.me = THIS_MODULE,
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};
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2007-12-05 07:24:03 +00:00
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static int __init hl_mt6_init(void)
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2005-04-16 22:20:36 +00:00
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{
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2007-12-05 07:24:03 +00:00
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return xt_register_match(&hl_mt6_reg);
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2005-04-16 22:20:36 +00:00
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}
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2007-12-05 07:24:03 +00:00
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static void __exit hl_mt6_exit(void)
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2005-04-16 22:20:36 +00:00
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{
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2007-12-05 07:24:03 +00:00
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xt_unregister_match(&hl_mt6_reg);
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2005-04-16 22:20:36 +00:00
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}
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2007-12-05 07:24:03 +00:00
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module_init(hl_mt6_init);
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module_exit(hl_mt6_exit);
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