[deliverable/linux.git] / net / ipv4 / netfilter / arptable_filter.c

/*
 * Filtering ARP tables module.
 *
 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
 *
 */

#include <linux/module.h>
#include <linux/netfilter_arp/arp_tables.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
MODULE_DESCRIPTION("arptables filter table");

#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT) | \
			   (1 << NF_ARP_FORWARD))

static struct
{
	struct arpt_replace repl;
	struct arpt_standard entries[3];
	struct arpt_error term;
} initial_table __net_initdata = {
	.repl = {
		.name = "filter",
		.valid_hooks = FILTER_VALID_HOOKS,
		.num_entries = 4,
		.size = sizeof(struct arpt_standard) * 3 + sizeof(struct arpt_error),
		.hook_entry = {
			[NF_ARP_IN] = 0,
			[NF_ARP_OUT] = sizeof(struct arpt_standard),
			[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard),
		},
		.underflow = {
			[NF_ARP_IN] = 0,
			[NF_ARP_OUT] = sizeof(struct arpt_standard),
			[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard),
		},
	},
	.entries = {
		ARPT_STANDARD_INIT(NF_ACCEPT),	/* ARP_IN */
		ARPT_STANDARD_INIT(NF_ACCEPT),	/* ARP_OUT */
		ARPT_STANDARD_INIT(NF_ACCEPT),	/* ARP_FORWARD */
	},
	.term = ARPT_ERROR_INIT,
};

static struct xt_table packet_filter = {
	.name		= "filter",
	.valid_hooks	= FILTER_VALID_HOOKS,
	.lock		= __RW_LOCK_UNLOCKED(packet_filter.lock),
	.private	= NULL,
	.me		= THIS_MODULE,
	.af		= NF_ARP,
};

/* The work comes in here from netfilter.c */
static unsigned int arpt_hook(unsigned int hook,
			      struct sk_buff *skb,
			      const struct net_device *in,
			      const struct net_device *out,
			      int (*okfn)(struct sk_buff *))
{
	return arpt_do_table(skb, hook, in, out, init_net.ipv4.arptable_filter);
}

static struct nf_hook_ops arpt_ops[] __read_mostly = {
	{
		.hook		= arpt_hook,
		.owner		= THIS_MODULE,
		.pf		= NF_ARP,
		.hooknum	= NF_ARP_IN,
		.priority	= NF_IP_PRI_FILTER,
	},
	{
		.hook		= arpt_hook,
		.owner		= THIS_MODULE,
		.pf		= NF_ARP,
		.hooknum	= NF_ARP_OUT,
		.priority	= NF_IP_PRI_FILTER,
	},
	{
		.hook		= arpt_hook,
		.owner		= THIS_MODULE,
		.pf		= NF_ARP,
		.hooknum	= NF_ARP_FORWARD,
		.priority	= NF_IP_PRI_FILTER,
	},
};

static int __net_init arptable_filter_net_init(struct net *net)
{
	/* Register table */
	net->ipv4.arptable_filter =
		arpt_register_table(net, &packet_filter, &initial_table.repl);
	if (IS_ERR(net->ipv4.arptable_filter))
		return PTR_ERR(net->ipv4.arptable_filter);
	return 0;
}

static void __net_exit arptable_filter_net_exit(struct net *net)
{
	arpt_unregister_table(net->ipv4.arptable_filter);
}

static struct pernet_operations arptable_filter_net_ops = {
	.init = arptable_filter_net_init,
	.exit = arptable_filter_net_exit,
};

static int __init arptable_filter_init(void)
{
	int ret;

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

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

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

static void __exit arptable_filter_fini(void)
{
	nf_unregister_hooks(arpt_ops, ARRAY_SIZE(arpt_ops));
	unregister_pernet_subsys(&arptable_filter_net_ops);
}

module_init(arptable_filter_init);
module_exit(arptable_filter_fini);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Filtering ARP tables module.
	3	*
	4	* Copyright (C) 2002 David S. Miller (davem@redhat.com)
	5	*
	6	*/
	7
	8	#include <linux/module.h>
	9	#include <linux/netfilter_arp/arp_tables.h>
	10
	11	MODULE_LICENSE("GPL");
	12	MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
	13	MODULE_DESCRIPTION("arptables filter table");
	14
	15	#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) \| (1 << NF_ARP_OUT) \| \
	16	(1 << NF_ARP_FORWARD))
	17
1da177e4 LT	18	static struct
	19	{
	20	struct arpt_replace repl;
	21	struct arpt_standard entries[3];
	22	struct arpt_error term;
9ea0cb26	23	} initial_table __net_initdata = {
3c2ad469 PM	24	.repl = {
	25	.name = "filter",
	26	.valid_hooks = FILTER_VALID_HOOKS,
	27	.num_entries = 4,
	28	.size = sizeof(struct arpt_standard) * 3 + sizeof(struct arpt_error),
	29	.hook_entry = {
	30	[NF_ARP_IN] = 0,
	31	[NF_ARP_OUT] = sizeof(struct arpt_standard),
	32	[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard),
	33	},
	34	.underflow = {
	35	[NF_ARP_IN] = 0,
	36	[NF_ARP_OUT] = sizeof(struct arpt_standard),
	37	[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard),
	38	},
	39	},
	40	.entries = {
	41	ARPT_STANDARD_INIT(NF_ACCEPT), /* ARP_IN */
	42	ARPT_STANDARD_INIT(NF_ACCEPT), /* ARP_OUT */
	43	ARPT_STANDARD_INIT(NF_ACCEPT), /* ARP_FORWARD */
	44	},
	45	.term = ARPT_ERROR_INIT,
1da177e4 LT	46	};
1da177e4 LT	47
4abff077	48	static struct xt_table packet_filter = {
1da177e4 LT	49	.name = "filter",
1da177e4 LT	50	.valid_hooks = FILTER_VALID_HOOKS,
fdccecd0	51	.lock = __RW_LOCK_UNLOCKED(packet_filter.lock),
1da177e4 LT	52	.private = NULL,
1da177e4 LT	53	.me = THIS_MODULE,
2e4e6a17	54	.af = NF_ARP,
1da177e4 LT	55	};
	56
	57	/* The work comes in here from netfilter.c */
	58	static unsigned int arpt_hook(unsigned int hook,
3db05fea	59	struct sk_buff *skb,
1da177e4 LT	60	const struct net_device *in,
	61	const struct net_device *out,
	62	int (okfn)(struct sk_buff ))
	63	{
9ea0cb26	64	return arpt_do_table(skb, hook, in, out, init_net.ipv4.arptable_filter);
1da177e4 LT	65	}
1da177e4 LT	66
1999414a	67	static struct nf_hook_ops arpt_ops[] __read_mostly = {
1da177e4 LT	68	{
	69	.hook = arpt_hook,
	70	.owner = THIS_MODULE,
	71	.pf = NF_ARP,
	72	.hooknum = NF_ARP_IN,
c2f9c683	73	.priority = NF_IP_PRI_FILTER,
1da177e4 LT	74	},
	75	{
	76	.hook = arpt_hook,
	77	.owner = THIS_MODULE,
	78	.pf = NF_ARP,
	79	.hooknum = NF_ARP_OUT,
c2f9c683	80	.priority = NF_IP_PRI_FILTER,
1da177e4 LT	81	},
	82	{
	83	.hook = arpt_hook,
	84	.owner = THIS_MODULE,
	85	.pf = NF_ARP,
	86	.hooknum = NF_ARP_FORWARD,
c2f9c683	87	.priority = NF_IP_PRI_FILTER,
1da177e4 LT	88	},
	89	};
	90
9ea0cb26 AD	91	static int __net_init arptable_filter_net_init(struct net *net)
	92	{
	93	/* Register table */
	94	net->ipv4.arptable_filter =
	95	arpt_register_table(net, &packet_filter, &initial_table.repl);
	96	if (IS_ERR(net->ipv4.arptable_filter))
	97	return PTR_ERR(net->ipv4.arptable_filter);
	98	return 0;
	99	}
	100
	101	static void __net_exit arptable_filter_net_exit(struct net *net)
	102	{
	103	arpt_unregister_table(net->ipv4.arptable_filter);
	104	}
	105
	106	static struct pernet_operations arptable_filter_net_ops = {
	107	.init = arptable_filter_net_init,
	108	.exit = arptable_filter_net_exit,
	109	};
	110
65b4b4e8	111	static int __init arptable_filter_init(void)
1da177e4	112	{
964ddaa1	113	int ret;
1da177e4	114
9ea0cb26 AD	115	ret = register_pernet_subsys(&arptable_filter_net_ops);
	116	if (ret < 0)
	117	return ret;
1da177e4	118
964ddaa1 PM	119	ret = nf_register_hooks(arpt_ops, ARRAY_SIZE(arpt_ops));
	120	if (ret < 0)
	121	goto cleanup_table;
1da177e4 LT	122	return ret;
1da177e4 LT	123
964ddaa1	124	cleanup_table:
9ea0cb26	125	unregister_pernet_subsys(&arptable_filter_net_ops);
1da177e4 LT	126	return ret;
	127	}
	128
65b4b4e8	129	static void __exit arptable_filter_fini(void)
1da177e4	130	{
964ddaa1	131	nf_unregister_hooks(arpt_ops, ARRAY_SIZE(arpt_ops));
9ea0cb26	132	unregister_pernet_subsys(&arptable_filter_net_ops);
1da177e4 LT	133	}
1da177e4 LT	134
65b4b4e8 AM	135	module_init(arptable_filter_init);
65b4b4e8 AM	136	module_exit(arptable_filter_fini);