[linux-2.6-block.git] / net / ipv6 / netfilter / ip6table_security.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * "security" table for IPv6
 *
 * This is for use by Mandatory Access Control (MAC) security models,
 * which need to be able to manage security policy in separate context
 * to DAC.
 *
 * Based on iptable_mangle.c
 *
 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
 * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
 */
#include <linux/module.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/slab.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
MODULE_DESCRIPTION("ip6tables security table, for MAC rules");

#define SECURITY_VALID_HOOKS	(1 << NF_INET_LOCAL_IN) | \
				(1 << NF_INET_FORWARD) | \
				(1 << NF_INET_LOCAL_OUT)

static int __net_init ip6table_security_table_init(struct net *net);

static const struct xt_table security_table = {
	.name		= "security",
	.valid_hooks	= SECURITY_VALID_HOOKS,
	.me		= THIS_MODULE,
	.af		= NFPROTO_IPV6,
	.priority	= NF_IP6_PRI_SECURITY,
	.table_init     = ip6table_security_table_init,
};

static unsigned int
ip6table_security_hook(void *priv, struct sk_buff *skb,
		       const struct nf_hook_state *state)
{
	return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security);
}

static struct nf_hook_ops *sectbl_ops __read_mostly;

static int __net_init ip6table_security_table_init(struct net *net)
{
	struct ip6t_replace *repl;
	int ret;

	if (net->ipv6.ip6table_security)
		return 0;

	repl = ip6t_alloc_initial_table(&security_table);
	if (repl == NULL)
		return -ENOMEM;
	ret = ip6t_register_table(net, &security_table, repl, sectbl_ops,
				  &net->ipv6.ip6table_security);
	kfree(repl);
	return ret;
}

static void __net_exit ip6table_security_net_exit(struct net *net)
{
	if (!net->ipv6.ip6table_security)
		return;
	ip6t_unregister_table(net, net->ipv6.ip6table_security, sectbl_ops);
	net->ipv6.ip6table_security = NULL;
}

static struct pernet_operations ip6table_security_net_ops = {
	.exit = ip6table_security_net_exit,
};

static int __init ip6table_security_init(void)
{
	int ret;

	sectbl_ops = xt_hook_ops_alloc(&security_table, ip6table_security_hook);
	if (IS_ERR(sectbl_ops))
		return PTR_ERR(sectbl_ops);

	ret = register_pernet_subsys(&ip6table_security_net_ops);
	if (ret < 0) {
		kfree(sectbl_ops);
		return ret;
	}

	ret = ip6table_security_table_init(&init_net);
	if (ret) {
		unregister_pernet_subsys(&ip6table_security_net_ops);
		kfree(sectbl_ops);
	}
	return ret;
}

static void __exit ip6table_security_fini(void)
{
	unregister_pernet_subsys(&ip6table_security_net_ops);
	kfree(sectbl_ops);
}

module_init(ip6table_security_init);
module_exit(ip6table_security_fini);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
17e6e59f JM	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>
17e6e59f JM	14	*/
	15	#include <linux/module.h>
	16	#include <linux/netfilter_ipv6/ip6_tables.h>
5a0e3ad6	17	#include <linux/slab.h>
17e6e59f JM	18
	19	MODULE_LICENSE("GPL");
	20	MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
	21	MODULE_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
b9e69e12 FW	27	static int __net_init ip6table_security_table_init(struct net *net);
b9e69e12 FW	28
35aad0ff	29	static const struct xt_table security_table = {
17e6e59f JM	30	.name = "security",
17e6e59f JM	31	.valid_hooks = SECURITY_VALID_HOOKS,
17e6e59f	32	.me = THIS_MODULE,
f88e6a8a	33	.af = NFPROTO_IPV6,
2b95efe7	34	.priority = NF_IP6_PRI_SECURITY,
b9e69e12	35	.table_init = ip6table_security_table_init,
17e6e59f JM	36	};
	37
	38	static unsigned int
06198b34	39	ip6table_security_hook(void priv, struct sk_buff skb,
238e54c9	40	const struct nf_hook_state *state)
17e6e59f	41	{
6cb8ff3f	42	return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security);
17e6e59f JM	43	}
17e6e59f JM	44
2b95efe7	45	static struct nf_hook_ops *sectbl_ops __read_mostly;
17e6e59f	46
b9e69e12	47	static int __net_init ip6table_security_table_init(struct net *net)
17e6e59f	48	{
e3eaa991	49	struct ip6t_replace *repl;
a67dd266	50	int ret;
17e6e59f	51
b9e69e12 FW	52	if (net->ipv6.ip6table_security)
	53	return 0;
	54
e3eaa991 JE	55	repl = ip6t_alloc_initial_table(&security_table);
	56	if (repl == NULL)
	57	return -ENOMEM;
a67dd266 FW	58	ret = ip6t_register_table(net, &security_table, repl, sectbl_ops,
a67dd266 FW	59	&net->ipv6.ip6table_security);
e3eaa991	60	kfree(repl);
a67dd266	61	return ret;
17e6e59f JM	62	}
	63
	64	static void __net_exit ip6table_security_net_exit(struct net *net)
	65	{
b9e69e12 FW	66	if (!net->ipv6.ip6table_security)
b9e69e12 FW	67	return;
a67dd266	68	ip6t_unregister_table(net, net->ipv6.ip6table_security, sectbl_ops);
b9e69e12	69	net->ipv6.ip6table_security = NULL;
17e6e59f JM	70	}
	71
	72	static struct pernet_operations ip6table_security_net_ops = {
17e6e59f JM	73	.exit = ip6table_security_net_exit,
	74	};
	75
	76	static int __init ip6table_security_init(void)
	77	{
	78	int ret;
	79
b9e69e12 FW	80	sectbl_ops = xt_hook_ops_alloc(&security_table, ip6table_security_hook);
	81	if (IS_ERR(sectbl_ops))
	82	return PTR_ERR(sectbl_ops);
	83
17e6e59f	84	ret = register_pernet_subsys(&ip6table_security_net_ops);
b9e69e12 FW	85	if (ret < 0) {
b9e69e12 FW	86	kfree(sectbl_ops);
17e6e59f	87	return ret;
2b95efe7	88	}
17e6e59f	89
b9e69e12 FW	90	ret = ip6table_security_table_init(&init_net);
	91	if (ret) {
	92	unregister_pernet_subsys(&ip6table_security_net_ops);
	93	kfree(sectbl_ops);
	94	}
17e6e59f JM	95	return ret;
	96	}
	97
	98	static void __exit ip6table_security_fini(void)
	99	{
17e6e59f	100	unregister_pernet_subsys(&ip6table_security_net_ops);
b9e69e12	101	kfree(sectbl_ops);
17e6e59f JM	102	}
	103
	104	module_init(ip6table_security_init);
	105	module_exit(ip6table_security_fini);