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