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