2005-04-16 22:20:36 +00:00
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/* IP tables module for matching the value of the TTL
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*
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* ipt_ttl.c,v 1.5 2000/11/13 11:16:08 laforge Exp
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*
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* (C) 2000,2001 by Harald Welte <laforge@netfilter.org>
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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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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter_ipv4/ipt_ttl.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("IP tables TTL matching module");
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MODULE_LICENSE("GPL");
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2006-03-21 02:02:56 +00:00
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static int match(const struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out,
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const struct xt_match *match, const void *matchinfo,
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[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
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int offset, unsigned int protoff, int *hotdrop)
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2005-04-16 22:20:36 +00:00
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{
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const struct ipt_ttl_info *info = matchinfo;
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switch (info->mode) {
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case IPT_TTL_EQ:
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return (skb->nh.iph->ttl == info->ttl);
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break;
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case IPT_TTL_NE:
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return (!(skb->nh.iph->ttl == info->ttl));
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break;
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case IPT_TTL_LT:
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return (skb->nh.iph->ttl < info->ttl);
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break;
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case IPT_TTL_GT:
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return (skb->nh.iph->ttl > info->ttl);
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break;
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default:
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printk(KERN_WARNING "ipt_ttl: unknown mode %d\n",
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info->mode);
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return 0;
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}
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return 0;
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}
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static struct ipt_match ttl_match = {
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.name = "ttl",
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2006-03-21 02:01:14 +00:00
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.match = match,
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.matchsize = sizeof(struct ipt_ttl_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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2006-03-29 00:37:06 +00:00
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static int __init ipt_ttl_init(void)
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2005-04-16 22:20:36 +00:00
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{
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return ipt_register_match(&ttl_match);
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}
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2006-03-29 00:37:06 +00:00
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static void __exit ipt_ttl_fini(void)
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2005-04-16 22:20:36 +00:00
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{
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ipt_unregister_match(&ttl_match);
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}
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2006-03-29 00:37:06 +00:00
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module_init(ipt_ttl_init);
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module_exit(ipt_ttl_fini);
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