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(const struct nf_hook_ops *ops, struct sk_buff *skb,
40		       const struct nf_hook_state *state)
41{
42	const struct net *net = dev_net(state->in ? state->in : state->out);
43
44	return ip6t_do_table(skb, ops->hooknum, state,
45			     net->ipv6.ip6table_security);
46}
47
48static struct nf_hook_ops *sectbl_ops __read_mostly;
49
50static int __net_init ip6table_security_net_init(struct net *net)
51{
52	struct ip6t_replace *repl;
53
54	repl = ip6t_alloc_initial_table(&security_table);
55	if (repl == NULL)
56		return -ENOMEM;
57	net->ipv6.ip6table_security =
58		ip6t_register_table(net, &security_table, repl);
59	kfree(repl);
60	return PTR_ERR_OR_ZERO(net->ipv6.ip6table_security);
61}
62
63static void __net_exit ip6table_security_net_exit(struct net *net)
64{
65	ip6t_unregister_table(net, net->ipv6.ip6table_security);
66}
67
68static struct pernet_operations ip6table_security_net_ops = {
69	.init = ip6table_security_net_init,
70	.exit = ip6table_security_net_exit,
71};
72
73static int __init ip6table_security_init(void)
74{
75	int ret;
76
77	ret = register_pernet_subsys(&ip6table_security_net_ops);
78	if (ret < 0)
79		return ret;
80
81	sectbl_ops = xt_hook_link(&security_table, ip6table_security_hook);
82	if (IS_ERR(sectbl_ops)) {
83		ret = PTR_ERR(sectbl_ops);
84		goto cleanup_table;
85	}
86
87	return ret;
88
89cleanup_table:
90	unregister_pernet_subsys(&ip6table_security_net_ops);
91	return ret;
92}
93
94static void __exit ip6table_security_fini(void)
95{
96	xt_hook_unlink(&security_table, sectbl_ops);
97	unregister_pernet_subsys(&ip6table_security_net_ops);
98}
99
100module_init(ip6table_security_init);
101module_exit(ip6table_security_fini);
102