1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * "security" table for IPv6
4 *
5 * This is for use by Mandatory Access Control (MAC) security models,
6 * which need to be able to manage security policy in separate context
7 * to DAC.
8 *
9 * Based on iptable_mangle.c
10 *
11 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
12 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
13 * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
14 */
15#include <linux/module.h>
16#include <linux/netfilter_ipv6/ip6_tables.h>
17#include <linux/slab.h>
18
19MODULE_LICENSE("GPL");
20MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
21MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
22
23#define SECURITY_VALID_HOOKS	(1 << NF_INET_LOCAL_IN) | \
24				(1 << NF_INET_FORWARD) | \
25				(1 << NF_INET_LOCAL_OUT)
26
27static const struct xt_table security_table = {
28	.name		= "security",
29	.valid_hooks	= SECURITY_VALID_HOOKS,
30	.me		= THIS_MODULE,
31	.af		= NFPROTO_IPV6,
32	.priority	= NF_IP6_PRI_SECURITY,
33};
34
35static struct nf_hook_ops *sectbl_ops __read_mostly;
36
37static int ip6table_security_table_init(struct net *net)
38{
39	struct ip6t_replace *repl;
40	int ret;
41
42	repl = ip6t_alloc_initial_table(&security_table);
43	if (repl == NULL)
44		return -ENOMEM;
45	ret = ip6t_register_table(net, &security_table, repl, sectbl_ops);
46	kfree(repl);
47	return ret;
48}
49
50static void __net_exit ip6table_security_net_pre_exit(struct net *net)
51{
52	ip6t_unregister_table_pre_exit(net, "security");
53}
54
55static void __net_exit ip6table_security_net_exit(struct net *net)
56{
57	ip6t_unregister_table_exit(net, "security");
58}
59
60static struct pernet_operations ip6table_security_net_ops = {
61	.pre_exit = ip6table_security_net_pre_exit,
62	.exit = ip6table_security_net_exit,
63};
64
65static int __init ip6table_security_init(void)
66{
67	int ret = xt_register_template(&security_table,
68				       ip6table_security_table_init);
69
70	if (ret < 0)
71		return ret;
72
73	sectbl_ops = xt_hook_ops_alloc(&security_table, ip6t_do_table);
74	if (IS_ERR(sectbl_ops)) {
75		xt_unregister_template(&security_table);
76		return PTR_ERR(sectbl_ops);
77	}
78
79	ret = register_pernet_subsys(&ip6table_security_net_ops);
80	if (ret < 0) {
81		kfree(sectbl_ops);
82		xt_unregister_template(&security_table);
83		return ret;
84	}
85
86	return ret;
87}
88
89static void __exit ip6table_security_fini(void)
90{
91	unregister_pernet_subsys(&ip6table_security_net_ops);
92	xt_unregister_template(&security_table);
93	kfree(sectbl_ops);
94}
95
96module_init(ip6table_security_init);
97module_exit(ip6table_security_fini);
98