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Commit | Line | Data |
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1da177e4 LT |
1 | /* Kernel module to match NFMARK values. */ |
2 | ||
3 | /* (C) 1999-2001 Marc Boucher <marc@mbsi.ca> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/skbuff.h> | |
12 | ||
13 | #include <linux/netfilter_ipv4/ipt_mark.h> | |
14 | #include <linux/netfilter_ipv4/ip_tables.h> | |
15 | ||
16 | MODULE_LICENSE("GPL"); | |
17 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); | |
18 | MODULE_DESCRIPTION("iptables mark matching 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, | |
26 | int *hotdrop) | |
27 | { | |
28 | const struct ipt_mark_info *info = matchinfo; | |
29 | ||
30 | return ((skb->nfmark & info->mask) == info->mark) ^ info->invert; | |
31 | } | |
32 | ||
33 | static int | |
34 | checkentry(const char *tablename, | |
35 | const struct ipt_ip *ip, | |
36 | void *matchinfo, | |
37 | unsigned int matchsize, | |
38 | unsigned int hook_mask) | |
39 | { | |
bf3a46aa HW |
40 | struct ipt_mark_info *minfo = (struct ipt_mark_info *) matchinfo; |
41 | ||
1da177e4 LT |
42 | if (matchsize != IPT_ALIGN(sizeof(struct ipt_mark_info))) |
43 | return 0; | |
44 | ||
bf3a46aa HW |
45 | if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) { |
46 | printk(KERN_WARNING "mark: only supports 32bit mark\n"); | |
47 | return 0; | |
48 | } | |
49 | ||
1da177e4 LT |
50 | return 1; |
51 | } | |
52 | ||
53 | static struct ipt_match mark_match = { | |
54 | .name = "mark", | |
55 | .match = &match, | |
56 | .checkentry = &checkentry, | |
57 | .me = THIS_MODULE, | |
58 | }; | |
59 | ||
60 | static int __init init(void) | |
61 | { | |
62 | return ipt_register_match(&mark_match); | |
63 | } | |
64 | ||
65 | static void __exit fini(void) | |
66 | { | |
67 | ipt_unregister_match(&mark_match); | |
68 | } | |
69 | ||
70 | module_init(init); | |
71 | module_exit(fini); |