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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
16MODULE_LICENSE("GPL");
17MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
18MODULE_DESCRIPTION("Xtables: packet mark operations");
19MODULE_ALIAS("ipt_mark");
20MODULE_ALIAS("ip6t_mark");
21MODULE_ALIAS("ipt_MARK");
22MODULE_ALIAS("ip6t_MARK");
23MODULE_ALIAS("arpt_MARK");
24
25static unsigned int
26mark_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
34static bool
35mark_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
42static 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) || IS_ENABLED(CONFIG_NFT_COMPAT_ARP)
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
73static 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
82static 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
97static 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
103module_init(mark_mt_init);
104module_exit(mark_mt_exit);