1 /* This kernel module matches connection mark values set by the
4 * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
5 * by Henrik Nordstrom <hno@marasystems.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/module.h>
23 #include <linux/skbuff.h>
25 MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
26 MODULE_DESCRIPTION("IP tables connmark match module");
27 MODULE_LICENSE("GPL");
29 #include <linux/netfilter_ipv4/ip_tables.h>
30 #include <linux/netfilter_ipv4/ipt_connmark.h>
31 #include <linux/netfilter_ipv4/ip_conntrack.h>
34 match(const struct sk_buff *skb,
35 const struct net_device *in,
36 const struct net_device *out,
37 const void *matchinfo,
41 const struct ipt_connmark_info *info = matchinfo;
42 enum ip_conntrack_info ctinfo;
43 struct ip_conntrack *ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
47 return ((ct->mark & info->mask) == info->mark) ^ info->invert;
51 checkentry(const char *tablename,
52 const struct ipt_ip *ip,
54 unsigned int matchsize,
55 unsigned int hook_mask)
57 struct ipt_connmark_info *cm =
58 (struct ipt_connmark_info *)matchinfo;
59 if (matchsize != IPT_ALIGN(sizeof(struct ipt_connmark_info)))
62 if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) {
63 printk(KERN_WARNING "connmark: only support 32bit mark\n");
70 static struct ipt_match connmark_match = {
73 .checkentry = &checkentry,
77 static int __init init(void)
79 return ipt_register_match(&connmark_match);
82 static void __exit fini(void)
84 ipt_unregister_match(&connmark_match);