[linux-2.6-block.git] / net / bridge / netfilter / ebtable_filter.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  ebtable_filter
 *
 *	Authors:
 *	Bart De Schuymer <bdschuym@pandora.be>
 *
 *  April, 2002
 *
 */

#include <linux/netfilter_bridge/ebtables.h>
#include <uapi/linux/netfilter_bridge.h>
#include <linux/module.h>

#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
			    (1 << NF_BR_LOCAL_OUT))

static struct ebt_entries initial_chains[] = {
	{
		.name	= "INPUT",
		.policy	= EBT_ACCEPT,
	},
	{
		.name	= "FORWARD",
		.policy	= EBT_ACCEPT,
	},
	{
		.name	= "OUTPUT",
		.policy	= EBT_ACCEPT,
	},
};

static struct ebt_replace_kernel initial_table = {
	.name		= "filter",
	.valid_hooks	= FILTER_VALID_HOOKS,
	.entries_size	= 3 * sizeof(struct ebt_entries),
	.hook_entry	= {
		[NF_BR_LOCAL_IN]	= &initial_chains[0],
		[NF_BR_FORWARD]		= &initial_chains[1],
		[NF_BR_LOCAL_OUT]	= &initial_chains[2],
	},
	.entries	= (char *)initial_chains,
};

static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
{
	if (valid_hooks & ~FILTER_VALID_HOOKS)
		return -EINVAL;
	return 0;
}

static const struct ebt_table frame_filter = {
	.name		= "filter",
	.table		= &initial_table,
	.valid_hooks	= FILTER_VALID_HOOKS,
	.check		= check,
	.me		= THIS_MODULE,
};

static unsigned int
ebt_in_hook(void *priv, struct sk_buff *skb,
	    const struct nf_hook_state *state)
{
	return ebt_do_table(skb, state, state->net->xt.frame_filter);
}

static unsigned int
ebt_out_hook(void *priv, struct sk_buff *skb,
	     const struct nf_hook_state *state)
{
	return ebt_do_table(skb, state, state->net->xt.frame_filter);
}

static const struct nf_hook_ops ebt_ops_filter[] = {
	{
		.hook		= ebt_in_hook,
		.pf		= NFPROTO_BRIDGE,
		.hooknum	= NF_BR_LOCAL_IN,
		.priority	= NF_BR_PRI_FILTER_BRIDGED,
	},
	{
		.hook		= ebt_in_hook,
		.pf		= NFPROTO_BRIDGE,
		.hooknum	= NF_BR_FORWARD,
		.priority	= NF_BR_PRI_FILTER_BRIDGED,
	},
	{
		.hook		= ebt_out_hook,
		.pf		= NFPROTO_BRIDGE,
		.hooknum	= NF_BR_LOCAL_OUT,
		.priority	= NF_BR_PRI_FILTER_OTHER,
	},
};

static int __net_init frame_filter_net_init(struct net *net)
{
	return ebt_register_table(net, &frame_filter, ebt_ops_filter,
				  &net->xt.frame_filter);
}

static void __net_exit frame_filter_net_exit(struct net *net)
{
	ebt_unregister_table(net, net->xt.frame_filter, ebt_ops_filter);
}

static struct pernet_operations frame_filter_net_ops = {
	.init = frame_filter_net_init,
	.exit = frame_filter_net_exit,
};

static int __init ebtable_filter_init(void)
{
	return register_pernet_subsys(&frame_filter_net_ops);
}

static void __exit ebtable_filter_fini(void)
{
	unregister_pernet_subsys(&frame_filter_net_ops);
}

module_init(ebtable_filter_init);
module_exit(ebtable_filter_fini);
MODULE_LICENSE("GPL");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* ebtable_filter
	4	*
	5	* Authors:
	6	* Bart De Schuymer <bdschuym@pandora.be>
	7	*
	8	* April, 2002
	9	*
	10	*/
	11
	12	#include <linux/netfilter_bridge/ebtables.h>
94276fa8	13	#include <uapi/linux/netfilter_bridge.h>
1da177e4 LT	14	#include <linux/module.h>
	15
	16	#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) \| (1 << NF_BR_FORWARD) \| \
052a4bc4	17	(1 << NF_BR_LOCAL_OUT))
1da177e4	18
97ad8b53	19	static struct ebt_entries initial_chains[] = {
1da177e4 LT	20	{
	21	.name = "INPUT",
	22	.policy = EBT_ACCEPT,
	23	},
	24	{
	25	.name = "FORWARD",
	26	.policy = EBT_ACCEPT,
	27	},
	28	{
	29	.name = "OUTPUT",
	30	.policy = EBT_ACCEPT,
	31	},
	32	};
	33
97ad8b53	34	static struct ebt_replace_kernel initial_table = {
1da177e4 LT	35	.name = "filter",
	36	.valid_hooks = FILTER_VALID_HOOKS,
	37	.entries_size = 3 * sizeof(struct ebt_entries),
	38	.hook_entry = {
	39	[NF_BR_LOCAL_IN] = &initial_chains[0],
	40	[NF_BR_FORWARD] = &initial_chains[1],
	41	[NF_BR_LOCAL_OUT] = &initial_chains[2],
	42	},
	43	.entries = (char *)initial_chains,
	44	};
	45
	46	static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
	47	{
	48	if (valid_hooks & ~FILTER_VALID_HOOKS)
	49	return -EINVAL;
	50	return 0;
	51	}
	52
97ad8b53	53	static const struct ebt_table frame_filter = {
1da177e4 LT	54	.name = "filter",
1da177e4 LT	55	.table = &initial_table,
9d6f229f	56	.valid_hooks = FILTER_VALID_HOOKS,
1da177e4 LT	57	.check = check,
	58	.me = THIS_MODULE,
	59	};
	60
	61	static unsigned int
06198b34	62	ebt_in_hook(void priv, struct sk_buff skb,
238e54c9	63	const struct nf_hook_state *state)
1da177e4	64	{
97b59c3a	65	return ebt_do_table(skb, state, state->net->xt.frame_filter);
4aad1093 AD	66	}
	67
	68	static unsigned int
06198b34	69	ebt_out_hook(void priv, struct sk_buff skb,
238e54c9	70	const struct nf_hook_state *state)
4aad1093	71	{
97b59c3a	72	return ebt_do_table(skb, state, state->net->xt.frame_filter);
1da177e4 LT	73	}
1da177e4 LT	74
591bb278	75	static const struct nf_hook_ops ebt_ops_filter[] = {
1da177e4	76	{
4aad1093	77	.hook = ebt_in_hook,
24c232d8	78	.pf = NFPROTO_BRIDGE,
1da177e4 LT	79	.hooknum = NF_BR_LOCAL_IN,
	80	.priority = NF_BR_PRI_FILTER_BRIDGED,
	81	},
	82	{
4aad1093	83	.hook = ebt_in_hook,
24c232d8	84	.pf = NFPROTO_BRIDGE,
1da177e4 LT	85	.hooknum = NF_BR_FORWARD,
	86	.priority = NF_BR_PRI_FILTER_BRIDGED,
	87	},
	88	{
4aad1093	89	.hook = ebt_out_hook,
24c232d8	90	.pf = NFPROTO_BRIDGE,
1da177e4 LT	91	.hooknum = NF_BR_LOCAL_OUT,
	92	.priority = NF_BR_PRI_FILTER_OTHER,
	93	},
	94	};
	95
4aad1093 AD	96	static int __net_init frame_filter_net_init(struct net *net)
4aad1093 AD	97	{
e6b72ee8 AS	98	return ebt_register_table(net, &frame_filter, ebt_ops_filter,
e6b72ee8 AS	99	&net->xt.frame_filter);
4aad1093 AD	100	}
	101
	102	static void __net_exit frame_filter_net_exit(struct net *net)
	103	{
aee12a0a	104	ebt_unregister_table(net, net->xt.frame_filter, ebt_ops_filter);
4aad1093 AD	105	}
	106
	107	static struct pernet_operations frame_filter_net_ops = {
	108	.init = frame_filter_net_init,
	109	.exit = frame_filter_net_exit,
	110	};
	111
65b4b4e8	112	static int __init ebtable_filter_init(void)
1da177e4	113	{
aee12a0a	114	return register_pernet_subsys(&frame_filter_net_ops);
1da177e4 LT	115	}
1da177e4 LT	116
65b4b4e8	117	static void __exit ebtable_filter_fini(void)
1da177e4	118	{
4aad1093	119	unregister_pernet_subsys(&frame_filter_net_ops);
1da177e4 LT	120	}
1da177e4 LT	121
65b4b4e8 AM	122	module_init(ebtable_filter_init);
65b4b4e8 AM	123	module_exit(ebtable_filter_fini);
1da177e4	124	MODULE_LICENSE("GPL");