1 /* This kernel module matches connection mark values set by the
2 * CONNMARK target
3 *
4 * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
5 * by Henrik Nordstrom <hno@marasystems.com>
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include <linux/module.h>
23 #include <linux/skbuff.h>
24
25 MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
26 MODULE_DESCRIPTION("IP tables connmark match module");
27 MODULE_LICENSE("GPL");
28
29 #include <linux/netfilter_ipv4/ip_tables.h>
30 #include <linux/netfilter_ipv4/ipt_connmark.h>
31 #include <linux/netfilter_ipv4/ip_conntrack.h>
32
33 static int
34 match(const struct sk_buff *skb,
35 const struct net_device *in,
36 const struct net_device *out,
37 const void *matchinfo,
38 int offset,
39 int *hotdrop)
40 {
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);
44 if (!ct)
45 return 0;
46
47 return ((ct->mark & info->mask) == info->mark) ^ info->invert;
48 }
49
50 static int
51 checkentry(const char *tablename,
52 const struct ipt_ip *ip,
53 void *matchinfo,
54 unsigned int matchsize,
55 unsigned int hook_mask)
56 {
57 if (matchsize != IPT_ALIGN(sizeof(struct ipt_connmark_info)))
58 return 0;
59
60 return 1;
61 }
62
63 static struct ipt_match connmark_match = {
64 .name = "connmark",
65 .match = &match,
66 .checkentry = &checkentry,
67 .me = THIS_MODULE
68 };
69
70 static int __init init(void)
71 {
72 return ipt_register_match(&connmark_match);
73 }
74
75 static void __exit fini(void)
76 {
77 ipt_unregister_match(&connmark_match);
78 }
79
80 module_init(init);
81 module_exit(fini);
82
|
This page was automatically generated by the
LXR engine.
|