Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Kernel module to match TOS values. */ |
2 | ||
3 | /* (C) 1999-2001 Paul `Rusty' Russell | |
4 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/skbuff.h> | |
13 | ||
14 | #include <linux/netfilter_ipv4/ipt_tos.h> | |
15 | #include <linux/netfilter_ipv4/ip_tables.h> | |
16 | ||
17 | MODULE_LICENSE("GPL"); | |
18 | MODULE_DESCRIPTION("iptables TOS match module"); | |
19 | ||
20 | static int | |
21 | match(const struct sk_buff *skb, | |
22 | const struct net_device *in, | |
23 | const struct net_device *out, | |
24 | const void *matchinfo, | |
25 | int offset, | |
2e4e6a17 | 26 | unsigned int protoff, |
1da177e4 LT |
27 | int *hotdrop) |
28 | { | |
29 | const struct ipt_tos_info *info = matchinfo; | |
30 | ||
31 | return (skb->nh.iph->tos == info->tos) ^ info->invert; | |
32 | } | |
33 | ||
34 | static int | |
35 | checkentry(const char *tablename, | |
2e4e6a17 | 36 | const void *ip, |
1da177e4 LT |
37 | void *matchinfo, |
38 | unsigned int matchsize, | |
39 | unsigned int hook_mask) | |
40 | { | |
41 | if (matchsize != IPT_ALIGN(sizeof(struct ipt_tos_info))) | |
42 | return 0; | |
43 | ||
44 | return 1; | |
45 | } | |
46 | ||
47 | static struct ipt_match tos_match = { | |
48 | .name = "tos", | |
49 | .match = &match, | |
50 | .checkentry = &checkentry, | |
51 | .me = THIS_MODULE, | |
52 | }; | |
53 | ||
54 | static int __init init(void) | |
55 | { | |
56 | return ipt_register_match(&tos_match); | |
57 | } | |
58 | ||
59 | static void __exit fini(void) | |
60 | { | |
61 | ipt_unregister_match(&tos_match); | |
62 | } | |
63 | ||
64 | module_init(init); | |
65 | module_exit(fini); |