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1da177e4 LT |
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); |