[deliverable/linux.git] / net / ipv6 / netfilter / ip6table_security.c

/*
 * "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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/netfilter_ipv6/ip6_tables.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 const struct
{
	struct ip6t_replace repl;
	struct ip6t_standard entries[3];
	struct ip6t_error term;
} initial_table __net_initdata = {
	.repl = {
		.name = "security",
		.valid_hooks = SECURITY_VALID_HOOKS,
		.num_entries = 4,
		.size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
		.hook_entry = {
			[NF_INET_LOCAL_IN] 	= 0,
			[NF_INET_FORWARD] 	= sizeof(struct ip6t_standard),
			[NF_INET_LOCAL_OUT] 	= sizeof(struct ip6t_standard) * 2,
		},
		.underflow = {
			[NF_INET_LOCAL_IN] 	= 0,
			[NF_INET_FORWARD] 	= sizeof(struct ip6t_standard),
			[NF_INET_LOCAL_OUT] 	= sizeof(struct ip6t_standard) * 2,
		},
	},
	.entries = {
		IP6T_STANDARD_INIT(NF_ACCEPT),	/* LOCAL_IN */
		IP6T_STANDARD_INIT(NF_ACCEPT),	/* FORWARD */
		IP6T_STANDARD_INIT(NF_ACCEPT),	/* LOCAL_OUT */
	},
	.term = IP6T_ERROR_INIT,		/* ERROR */
};

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

static unsigned int
ip6t_local_in_hook(unsigned int hook,
		   struct sk_buff *skb,
		   const struct net_device *in,
		   const struct net_device *out,
		   int (*okfn)(struct sk_buff *))
{
	return ip6t_do_table(skb, hook, in, out,
			     dev_net(in)->ipv6.ip6table_security);
}

static unsigned int
ip6t_forward_hook(unsigned int hook,
		  struct sk_buff *skb,
		  const struct net_device *in,
		  const struct net_device *out,
		  int (*okfn)(struct sk_buff *))
{
	return ip6t_do_table(skb, hook, in, out,
			     dev_net(in)->ipv6.ip6table_security);
}

static unsigned int
ip6t_local_out_hook(unsigned int hook,
		    struct sk_buff *skb,
		    const struct net_device *in,
		    const struct net_device *out,
		    int (*okfn)(struct sk_buff *))
{
	/* TBD: handle short packets via raw socket */
	return ip6t_do_table(skb, hook, in, out,
			     dev_net(out)->ipv6.ip6table_security);
}

static struct nf_hook_ops ip6t_ops[] __read_mostly = {
	{
		.hook		= ip6t_local_in_hook,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_IPV6,
		.hooknum	= NF_INET_LOCAL_IN,
		.priority	= NF_IP6_PRI_SECURITY,
	},
	{
		.hook		= ip6t_forward_hook,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_IPV6,
		.hooknum	= NF_INET_FORWARD,
		.priority	= NF_IP6_PRI_SECURITY,
	},
	{
		.hook		= ip6t_local_out_hook,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_IPV6,
		.hooknum	= NF_INET_LOCAL_OUT,
		.priority	= NF_IP6_PRI_SECURITY,
	},
};

static int __net_init ip6table_security_net_init(struct net *net)
{
	net->ipv6.ip6table_security =
		ip6t_register_table(net, &security_table, &initial_table.repl);

	if (IS_ERR(net->ipv6.ip6table_security))
		return PTR_ERR(net->ipv6.ip6table_security);

	return 0;
}

static void __net_exit ip6table_security_net_exit(struct net *net)
{
	ip6t_unregister_table(net->ipv6.ip6table_security);
}

static struct pernet_operations ip6table_security_net_ops = {
	.init = ip6table_security_net_init,
	.exit = ip6table_security_net_exit,
};

static int __init ip6table_security_init(void)
{
	int ret;

	ret = register_pernet_subsys(&ip6table_security_net_ops);
	if (ret < 0)
		return ret;

	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
	if (ret < 0)
		goto cleanup_table;

	return ret;

cleanup_table:
	unregister_pernet_subsys(&ip6table_security_net_ops);
	return ret;
}

static void __exit ip6table_security_fini(void)
{
	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
	unregister_pernet_subsys(&ip6table_security_net_ops);
}

module_init(ip6table_security_init);
module_exit(ip6table_security_fini);
Commit	Line	Data
17e6e59f JM	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
	21	MODULE_LICENSE("GPL");
	22	MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
	23	MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
	24
	25	#define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) \| \
	26	(1 << NF_INET_FORWARD) \| \
	27	(1 << NF_INET_LOCAL_OUT)
	28
35aad0ff	29	static const struct
17e6e59f JM	30	{
	31	struct ip6t_replace repl;
	32	struct ip6t_standard entries[3];
	33	struct ip6t_error term;
f858b486	34	} initial_table __net_initdata = {
17e6e59f JM	35	.repl = {
	36	.name = "security",
	37	.valid_hooks = SECURITY_VALID_HOOKS,
	38	.num_entries = 4,
	39	.size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
	40	.hook_entry = {
	41	[NF_INET_LOCAL_IN] = 0,
	42	[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
	43	[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2,
	44	},
	45	.underflow = {
	46	[NF_INET_LOCAL_IN] = 0,
	47	[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
	48	[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2,
	49	},
	50	},
	51	.entries = {
	52	IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
	53	IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
	54	IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
	55	},
	56	.term = IP6T_ERROR_INIT, /* ERROR */
	57	};
	58
35aad0ff	59	static const struct xt_table security_table = {
17e6e59f JM	60	.name = "security",
17e6e59f JM	61	.valid_hooks = SECURITY_VALID_HOOKS,
17e6e59f	62	.me = THIS_MODULE,
f88e6a8a	63	.af = NFPROTO_IPV6,
17e6e59f JM	64	};
	65
	66	static unsigned int
	67	ip6t_local_in_hook(unsigned int hook,
	68	struct sk_buff *skb,
	69	const struct net_device *in,
	70	const struct net_device *out,
	71	int (okfn)(struct sk_buff ))
	72	{
	73	return ip6t_do_table(skb, hook, in, out,
48dc7865	74	dev_net(in)->ipv6.ip6table_security);
17e6e59f JM	75	}
	76
	77	static unsigned int
	78	ip6t_forward_hook(unsigned int hook,
	79	struct sk_buff *skb,
	80	const struct net_device *in,
	81	const struct net_device *out,
	82	int (okfn)(struct sk_buff ))
	83	{
	84	return ip6t_do_table(skb, hook, in, out,
48dc7865	85	dev_net(in)->ipv6.ip6table_security);
17e6e59f JM	86	}
	87
	88	static unsigned int
	89	ip6t_local_out_hook(unsigned int hook,
	90	struct sk_buff *skb,
	91	const struct net_device *in,
	92	const struct net_device *out,
	93	int (okfn)(struct sk_buff ))
	94	{
	95	/* TBD: handle short packets via raw socket */
	96	return ip6t_do_table(skb, hook, in, out,
48dc7865	97	dev_net(out)->ipv6.ip6table_security);
17e6e59f JM	98	}
	99
	100	static struct nf_hook_ops ip6t_ops[] __read_mostly = {
	101	{
	102	.hook = ip6t_local_in_hook,
	103	.owner = THIS_MODULE,
24c232d8	104	.pf = NFPROTO_IPV6,
17e6e59f JM	105	.hooknum = NF_INET_LOCAL_IN,
	106	.priority = NF_IP6_PRI_SECURITY,
	107	},
	108	{
	109	.hook = ip6t_forward_hook,
	110	.owner = THIS_MODULE,
24c232d8	111	.pf = NFPROTO_IPV6,
17e6e59f JM	112	.hooknum = NF_INET_FORWARD,
	113	.priority = NF_IP6_PRI_SECURITY,
	114	},
	115	{
	116	.hook = ip6t_local_out_hook,
	117	.owner = THIS_MODULE,
24c232d8	118	.pf = NFPROTO_IPV6,
17e6e59f JM	119	.hooknum = NF_INET_LOCAL_OUT,
	120	.priority = NF_IP6_PRI_SECURITY,
	121	},
	122	};
	123
	124	static int __net_init ip6table_security_net_init(struct net *net)
	125	{
	126	net->ipv6.ip6table_security =
	127	ip6t_register_table(net, &security_table, &initial_table.repl);
	128
	129	if (IS_ERR(net->ipv6.ip6table_security))
	130	return PTR_ERR(net->ipv6.ip6table_security);
	131
	132	return 0;
	133	}
	134
	135	static void __net_exit ip6table_security_net_exit(struct net *net)
	136	{
	137	ip6t_unregister_table(net->ipv6.ip6table_security);
	138	}
	139
	140	static struct pernet_operations ip6table_security_net_ops = {
	141	.init = ip6table_security_net_init,
	142	.exit = ip6table_security_net_exit,
	143	};
	144
	145	static int __init ip6table_security_init(void)
	146	{
	147	int ret;
	148
	149	ret = register_pernet_subsys(&ip6table_security_net_ops);
	150	if (ret < 0)
	151	return ret;
	152
	153	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
	154	if (ret < 0)
	155	goto cleanup_table;
	156
	157	return ret;
	158
	159	cleanup_table:
	160	unregister_pernet_subsys(&ip6table_security_net_ops);
	161	return ret;
	162	}
	163
	164	static void __exit ip6table_security_fini(void)
	165	{
	166	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
	167	unregister_pernet_subsys(&ip6table_security_net_ops);
	168	}
	169
	170	module_init(ip6table_security_init);
	171	module_exit(ip6table_security_fini);