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 MODULE_ALIAS("arpt_MARK");
27
28 static unsigned int
mark_tg(struct sk_buff * skb,const struct xt_action_param * par)29 mark_tg(struct sk_buff *skb, const struct xt_action_param *par)
30 {
31 const struct xt_mark_tginfo2 *info = par->targinfo;
32
33 skb->mark = (skb->mark & ~info->mask) ^ info->mark;
34 return XT_CONTINUE;
35 }
36
37 static bool
mark_mt(const struct sk_buff * skb,struct xt_action_param * par)38 mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
39 {
40 const struct xt_mark_mtinfo1 *info = par->matchinfo;
41
42 return ((skb->mark & info->mask) == info->mark) ^ info->invert;
43 }
44
45 static struct xt_target mark_tg_reg __read_mostly = {
46 .name = "MARK",
47 .revision = 2,
48 .family = NFPROTO_UNSPEC,
49 .target = mark_tg,
50 .targetsize = sizeof(struct xt_mark_tginfo2),
51 .me = THIS_MODULE,
52 };
53
54 static struct xt_match mark_mt_reg __read_mostly = {
55 .name = "mark",
56 .revision = 1,
57 .family = NFPROTO_UNSPEC,
58 .match = mark_mt,
59 .matchsize = sizeof(struct xt_mark_mtinfo1),
60 .me = THIS_MODULE,
61 };
62
mark_mt_init(void)63 static int __init mark_mt_init(void)
64 {
65 int ret;
66
67 ret = xt_register_target(&mark_tg_reg);
68 if (ret < 0)
69 return ret;
70 ret = xt_register_match(&mark_mt_reg);
71 if (ret < 0) {
72 xt_unregister_target(&mark_tg_reg);
73 return ret;
74 }
75 return 0;
76 }
77
mark_mt_exit(void)78 static void __exit mark_mt_exit(void)
79 {
80 xt_unregister_match(&mark_mt_reg);
81 xt_unregister_target(&mark_tg_reg);
82 }
83
84 module_init(mark_mt_init);
85 module_exit(mark_mt_exit);
86
