1/*
2 * "security" table for IPv6
3 *
4 * This is for use by Mandatory Access Control (MAC) security models,
5 * which need to be able to manage security policy in separate context
6 * to DAC.
7 *
8 * Based on iptable_mangle.c
9 *
10 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
11 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
12 * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18#include <linux/module.h>
19#include <linux/netfilter_ipv6/ip6_tables.h>
20#include <linux/slab.h>
21
22MODULE_LICENSE("GPL");
23MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
24MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
25
26#define SECURITY_VALID_HOOKS	(1 << NF_INET_LOCAL_IN) | \
27				(1 << NF_INET_FORWARD) | \
28				(1 << NF_INET_LOCAL_OUT)
29
30static const struct xt_table security_table = {
31	.name		= "security",
32	.valid_hooks	= SECURITY_VALID_HOOKS,
33	.me		= THIS_MODULE,
34	.af		= NFPROTO_IPV6,
35	.priority	= NF_IP6_PRI_SECURITY,
36};
37
38static unsigned int
39ip6table_security_hook(void *priv, struct sk_buff *skb,
40		       const struct nf_hook_state *state)
41{
42	return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security);
43}
44
45static struct nf_hook_ops *sectbl_ops __read_mostly;
46
47static int __net_init ip6table_security_net_init(struct net *net)
48{
49	struct ip6t_replace *repl;
50
51	repl = ip6t_alloc_initial_table(&security_table);
52	if (repl == NULL)
53		return -ENOMEM;
54	net->ipv6.ip6table_security =
55		ip6t_register_table(net, &security_table, repl);
56	kfree(repl);
57	return PTR_ERR_OR_ZERO(net->ipv6.ip6table_security);
58}
59
60static void __net_exit ip6table_security_net_exit(struct net *net)
61{
62	ip6t_unregister_table(net, net->ipv6.ip6table_security);
63}
64
65static struct pernet_operations ip6table_security_net_ops = {
66	.init = ip6table_security_net_init,
67	.exit = ip6table_security_net_exit,
68};
69
70static int __init ip6table_security_init(void)
71{
72	int ret;
73
74	ret = register_pernet_subsys(&ip6table_security_net_ops);
75	if (ret < 0)
76		return ret;
77
78	sectbl_ops = xt_hook_link(&security_table, ip6table_security_hook);
79	if (IS_ERR(sectbl_ops)) {
80		ret = PTR_ERR(sectbl_ops);
81		goto cleanup_table;
82	}
83
84	return ret;
85
86cleanup_table:
87	unregister_pernet_subsys(&ip6table_security_net_ops);
88	return ret;
89}
90
91static void __exit ip6table_security_fini(void)
92{
93	xt_hook_unlink(&security_table, sectbl_ops);
94	unregister_pernet_subsys(&ip6table_security_net_ops);
95}
96
97module_init(ip6table_security_init);
98module_exit(ip6table_security_fini);
99