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  	{
44  		.name           = "MARK",
45  		.revision       = 2,
46  		.family         = NFPROTO_IPV4,
47  		.target         = mark_tg,
48  		.targetsize     = sizeof(struct xt_mark_tginfo2),
49  		.me             = THIS_MODULE,
50  	},
51  #if IS_ENABLED(CONFIG_IP_NF_ARPTABLES)
52  	{
53  		.name           = "MARK",
54  		.revision       = 2,
55  		.family         = NFPROTO_ARP,
56  		.target         = mark_tg,
57  		.targetsize     = sizeof(struct xt_mark_tginfo2),
58  		.me             = THIS_MODULE,
59  	},
60  #endif
61  #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
62  	{
63  		.name           = "MARK",
64  		.revision       = 2,
65  		.family         = NFPROTO_IPV6,
66  		.target         = mark_tg,
67  		.targetsize     = sizeof(struct xt_mark_tginfo2),
68  		.me             = THIS_MODULE,
69  	},
70  #endif
71  };
72  
73  static struct xt_match mark_mt_reg __read_mostly = {
74  	.name           = "mark",
75  	.revision       = 1,
76  	.family         = NFPROTO_UNSPEC,
77  	.match          = mark_mt,
78  	.matchsize      = sizeof(struct xt_mark_mtinfo1),
79  	.me             = THIS_MODULE,
80  };
81  
mark_mt_init(void)82  static int __init mark_mt_init(void)
83  {
84  	int ret;
85  
86  	ret = xt_register_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
87  	if (ret < 0)
88  		return ret;
89  	ret = xt_register_match(&mark_mt_reg);
90  	if (ret < 0) {
91  		xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
92  		return ret;
93  	}
94  	return 0;
95  }
96  
mark_mt_exit(void)97  static void __exit mark_mt_exit(void)
98  {
99  	xt_unregister_match(&mark_mt_reg);
100  	xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
101  }
102  
103  module_init(mark_mt_init);
104  module_exit(mark_mt_exit);
105