1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *	xt_mark - Netfilter module to match NFMARK value
4  *
5  *	(C) 1999-2001 Marc Boucher <marc@mbsi.ca>
6  *	Copyright © CC Computer Consultants GmbH, 2007 - 2008
7  *	Jan Engelhardt <jengelh@medozas.de>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/skbuff.h>
12 
13 #include <linux/netfilter/xt_mark.h>
14 #include <linux/netfilter/x_tables.h>
15 
16 MODULE_LICENSE("GPL");
17 MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
18 MODULE_DESCRIPTION("Xtables: packet mark operations");
19 MODULE_ALIAS("ipt_mark");
20 MODULE_ALIAS("ip6t_mark");
21 MODULE_ALIAS("ipt_MARK");
22 MODULE_ALIAS("ip6t_MARK");
23 MODULE_ALIAS("arpt_MARK");
24 
25 static unsigned int
mark_tg(struct sk_buff * skb,const struct xt_action_param * par)26 mark_tg(struct sk_buff *skb, const struct xt_action_param *par)
27 {
28 	const struct xt_mark_tginfo2 *info = par->targinfo;
29 
30 	skb->mark = (skb->mark & ~info->mask) ^ info->mark;
31 	return XT_CONTINUE;
32 }
33 
34 static bool
mark_mt(const struct sk_buff * skb,struct xt_action_param * par)35 mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
36 {
37 	const struct xt_mark_mtinfo1 *info = par->matchinfo;
38 
39 	return ((skb->mark & info->mask) == info->mark) ^ info->invert;
40 }
41 
42 static struct xt_target mark_tg_reg __read_mostly = {
43 	.name           = "MARK",
44 	.revision       = 2,
45 	.family         = NFPROTO_UNSPEC,
46 	.target         = mark_tg,
47 	.targetsize     = sizeof(struct xt_mark_tginfo2),
48 	.me             = THIS_MODULE,
49 };
50 
51 static struct xt_match mark_mt_reg __read_mostly = {
52 	.name           = "mark",
53 	.revision       = 1,
54 	.family         = NFPROTO_UNSPEC,
55 	.match          = mark_mt,
56 	.matchsize      = sizeof(struct xt_mark_mtinfo1),
57 	.me             = THIS_MODULE,
58 };
59 
mark_mt_init(void)60 static int __init mark_mt_init(void)
61 {
62 	int ret;
63 
64 	ret = xt_register_target(&mark_tg_reg);
65 	if (ret < 0)
66 		return ret;
67 	ret = xt_register_match(&mark_mt_reg);
68 	if (ret < 0) {
69 		xt_unregister_target(&mark_tg_reg);
70 		return ret;
71 	}
72 	return 0;
73 }
74 
mark_mt_exit(void)75 static void __exit mark_mt_exit(void)
76 {
77 	xt_unregister_match(&mark_mt_reg);
78 	xt_unregister_target(&mark_tg_reg);
79 }
80 
81 module_init(mark_mt_init);
82 module_exit(mark_mt_exit);
83