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/* This kernel module matches connection mark values set by the
* CONNMARK target
*
* Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
* by Henrik Nordstrom <hno@marasystems.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/skbuff.h>
MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
MODULE_DESCRIPTION("IP tables connmark match module");
MODULE_LICENSE("GPL");
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_connmark.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
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_connmark_info *info = matchinfo;
enum ip_conntrack_info ctinfo;
struct ip_conntrack *ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
if (!ct)
return 0;
return ((ct->mark & info->mask) == info->mark) ^ info->invert;
}
static int
checkentry(const char *tablename,
const struct ipt_ip *ip,
void *matchinfo,
unsigned int matchsize,
unsigned int hook_mask)
{
if (matchsize != IPT_ALIGN(sizeof(struct ipt_connmark_info)))
return 0;
return 1;
}
static struct ipt_match connmark_match = {
.name = "connmark",
.match = &match,
.checkentry = &checkentry,
.me = THIS_MODULE
};
static int __init init(void)
{
return ipt_register_match(&connmark_match);
}
static void __exit fini(void)
{
ipt_unregister_match(&connmark_match);
}
module_init(init);
module_exit(fini);
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