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1 | /* |
2 | * xt_mark - Netfilter module to match NFMARK value |
3 | * |
4 | * (C) 1999-2001 Marc Boucher <marc@mbsi.ca> |
5 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
6 | * Jan Engelhardt <jengelh@medozas.de> |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU General Public License version 2 as |
10 | * published by the Free Software Foundation. |
11 | */ |
12 | |
13 | #include <linux/module.h> |
14 | #include <linux/skbuff.h> |
15 | |
16 | #include <linux/netfilter/xt_mark.h> |
17 | #include <linux/netfilter/x_tables.h> |
18 | |
19 | MODULE_LICENSE("GPL"); |
20 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
21 | MODULE_DESCRIPTION("Xtables: packet mark operations"); |
22 | MODULE_ALIAS("ipt_mark"); |
23 | MODULE_ALIAS("ip6t_mark"); |
24 | MODULE_ALIAS("ipt_MARK"); |
25 | MODULE_ALIAS("ip6t_MARK"); |
26 | |
27 | static unsigned int |
28 | mark_tg(struct sk_buff *skb, const struct xt_action_param *par) |
29 | { |
30 | const struct xt_mark_tginfo2 *info = par->targinfo; |
31 | |
32 | skb->mark = (skb->mark & ~info->mask) ^ info->mark; |
33 | return XT_CONTINUE; |
34 | } |
35 | |
36 | static bool |
37 | mark_mt(const struct sk_buff *skb, struct xt_action_param *par) |
38 | { |
39 | const struct xt_mark_mtinfo1 *info = par->matchinfo; |
40 | |
41 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; |
42 | } |
43 | |
44 | static struct xt_target mark_tg_reg __read_mostly = { |
45 | .name = "MARK", |
46 | .revision = 2, |
47 | .family = NFPROTO_UNSPEC, |
48 | .target = mark_tg, |
49 | .targetsize = sizeof(struct xt_mark_tginfo2), |
50 | .me = THIS_MODULE, |
51 | }; |
52 | |
53 | static struct xt_match mark_mt_reg __read_mostly = { |
54 | .name = "mark", |
55 | .revision = 1, |
56 | .family = NFPROTO_UNSPEC, |
57 | .match = mark_mt, |
58 | .matchsize = sizeof(struct xt_mark_mtinfo1), |
59 | .me = THIS_MODULE, |
60 | }; |
61 | |
62 | static int __init mark_mt_init(void) |
63 | { |
64 | int ret; |
65 | |
66 | ret = xt_register_target(&mark_tg_reg); |
67 | if (ret < 0) |
68 | return ret; |
69 | ret = xt_register_match(&mark_mt_reg); |
70 | if (ret < 0) { |
71 | xt_unregister_target(&mark_tg_reg); |
72 | return ret; |
73 | } |
74 | return 0; |
75 | } |
76 | |
77 | static void __exit mark_mt_exit(void) |
78 | { |
79 | xt_unregister_match(&mark_mt_reg); |
80 | xt_unregister_target(&mark_tg_reg); |
81 | } |
82 | |
83 | module_init(mark_mt_init); |
84 | module_exit(mark_mt_exit); |
85 |
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