[deliverable/linux.git] / net / ipv4 / netfilter / nf_tables_ipv4.c

/*
 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@netfilter.org>
 *
 * 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.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_tables.h>
#include <net/net_namespace.h>
#include <net/ip.h>
#include <net/netfilter/nf_tables_ipv4.h>

static unsigned int nft_do_chain_ipv4(const struct nf_hook_ops *ops,
				      struct sk_buff *skb,
				      const struct net_device *in,
				      const struct net_device *out,
				      int (*okfn)(struct sk_buff *))
{
	struct nft_pktinfo pkt;

	nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);

	return nft_do_chain_pktinfo(&pkt, ops);
}

static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
				    struct sk_buff *skb,
				    const struct net_device *in,
				    const struct net_device *out,
				    int (*okfn)(struct sk_buff *))
{
	if (unlikely(skb->len < sizeof(struct iphdr) ||
		     ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
		if (net_ratelimit())
			pr_info("nf_tables_ipv4: ignoring short SOCK_RAW "
				"packet\n");
		return NF_ACCEPT;
	}

	return nft_do_chain_ipv4(ops, skb, in, out, okfn);
}

struct nft_af_info nft_af_ipv4 __read_mostly = {
	.family		= NFPROTO_IPV4,
	.nhooks		= NF_INET_NUMHOOKS,
	.owner		= THIS_MODULE,
	.nops		= 1,
	.hooks		= {
		[NF_INET_LOCAL_IN]	= nft_do_chain_ipv4,
		[NF_INET_LOCAL_OUT]	= nft_ipv4_output,
		[NF_INET_FORWARD]	= nft_do_chain_ipv4,
		[NF_INET_PRE_ROUTING]	= nft_do_chain_ipv4,
		[NF_INET_POST_ROUTING]	= nft_do_chain_ipv4,
	},
};
EXPORT_SYMBOL_GPL(nft_af_ipv4);

static int nf_tables_ipv4_init_net(struct net *net)
{
	net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
	if (net->nft.ipv4 == NULL)
		return -ENOMEM;

	memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4));

	if (nft_register_afinfo(net, net->nft.ipv4) < 0)
		goto err;

	return 0;
err:
	kfree(net->nft.ipv4);
	return -ENOMEM;
}

static void nf_tables_ipv4_exit_net(struct net *net)
{
	nft_unregister_afinfo(net->nft.ipv4);
	kfree(net->nft.ipv4);
}

static struct pernet_operations nf_tables_ipv4_net_ops = {
	.init	= nf_tables_ipv4_init_net,
	.exit	= nf_tables_ipv4_exit_net,
};

static struct nf_chain_type filter_ipv4 = {
	.family		= NFPROTO_IPV4,
	.name		= "filter",
	.type		= NFT_CHAIN_T_DEFAULT,
	.hook_mask	= (1 << NF_INET_LOCAL_IN) |
			  (1 << NF_INET_LOCAL_OUT) |
			  (1 << NF_INET_FORWARD) |
			  (1 << NF_INET_PRE_ROUTING) |
			  (1 << NF_INET_POST_ROUTING),
};

static int __init nf_tables_ipv4_init(void)
{
	nft_register_chain_type(&filter_ipv4);
	return register_pernet_subsys(&nf_tables_ipv4_net_ops);
}

static void __exit nf_tables_ipv4_exit(void)
{
	unregister_pernet_subsys(&nf_tables_ipv4_net_ops);
	nft_unregister_chain_type(&filter_ipv4);
}

module_init(nf_tables_ipv4_init);
module_exit(nf_tables_ipv4_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_FAMILY(AF_INET);
Commit	Line	Data
96518518 PM	1	/*
96518518 PM	2	* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
9370761c	3	* Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@netfilter.org>
96518518 PM	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	10	*/
	11
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/ip.h>
	15	#include <linux/netfilter_ipv4.h>
	16	#include <net/netfilter/nf_tables.h>
99633ab2	17	#include <net/net_namespace.h>
96518518	18	#include <net/ip.h>
0ca743a5	19	#include <net/netfilter/nf_tables_ipv4.h>
96518518	20
3b088c4b PM	21	static unsigned int nft_do_chain_ipv4(const struct nf_hook_ops *ops,
	22	struct sk_buff *skb,
	23	const struct net_device *in,
	24	const struct net_device *out,
	25	int (okfn)(struct sk_buff ))
	26	{
	27	struct nft_pktinfo pkt;
	28
	29	nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
	30
	31	return nft_do_chain_pktinfo(&pkt, ops);
	32	}
	33
96518518 PM	34	static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
	35	struct sk_buff *skb,
	36	const struct net_device *in,
	37	const struct net_device *out,
	38	int (okfn)(struct sk_buff ))
	39	{
	40	if (unlikely(skb->len < sizeof(struct iphdr) \|\|
	41	ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
	42	if (net_ratelimit())
	43	pr_info("nf_tables_ipv4: ignoring short SOCK_RAW "
	44	"packet\n");
	45	return NF_ACCEPT;
	46	}
	47
3b088c4b	48	return nft_do_chain_ipv4(ops, skb, in, out, okfn);
96518518 PM	49	}
96518518 PM	50
1d49144c	51	struct nft_af_info nft_af_ipv4 __read_mostly = {
96518518 PM	52	.family = NFPROTO_IPV4,
	53	.nhooks = NF_INET_NUMHOOKS,
	54	.owner = THIS_MODULE,
115a60b1	55	.nops = 1,
96518518	56	.hooks = {
3b088c4b	57	[NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
96518518	58	[NF_INET_LOCAL_OUT] = nft_ipv4_output,
3b088c4b PM	59	[NF_INET_FORWARD] = nft_do_chain_ipv4,
	60	[NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
	61	[NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
96518518 PM	62	},
96518518 PM	63	};
1d49144c	64	EXPORT_SYMBOL_GPL(nft_af_ipv4);
96518518	65
99633ab2 PNA	66	static int nf_tables_ipv4_init_net(struct net *net)
	67	{
	68	net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
	69	if (net->nft.ipv4 == NULL)
	70	return -ENOMEM;
	71
	72	memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4));
	73
	74	if (nft_register_afinfo(net, net->nft.ipv4) < 0)
	75	goto err;
	76
	77	return 0;
	78	err:
	79	kfree(net->nft.ipv4);
	80	return -ENOMEM;
	81	}
	82
	83	static void nf_tables_ipv4_exit_net(struct net *net)
	84	{
	85	nft_unregister_afinfo(net->nft.ipv4);
	86	kfree(net->nft.ipv4);
	87	}
	88
	89	static struct pernet_operations nf_tables_ipv4_net_ops = {
	90	.init = nf_tables_ipv4_init_net,
	91	.exit = nf_tables_ipv4_exit_net,
	92	};
0ca743a5	93
9370761c PNA	94	static struct nf_chain_type filter_ipv4 = {
	95	.family = NFPROTO_IPV4,
	96	.name = "filter",
	97	.type = NFT_CHAIN_T_DEFAULT,
	98	.hook_mask = (1 << NF_INET_LOCAL_IN) \|
	99	(1 << NF_INET_LOCAL_OUT) \|
	100	(1 << NF_INET_FORWARD) \|
	101	(1 << NF_INET_PRE_ROUTING) \|
	102	(1 << NF_INET_POST_ROUTING),
9370761c PNA	103	};
9370761c PNA	104
96518518 PM	105	static int __init nf_tables_ipv4_init(void)
96518518 PM	106	{
9370761c	107	nft_register_chain_type(&filter_ipv4);
99633ab2	108	return register_pernet_subsys(&nf_tables_ipv4_net_ops);
96518518 PM	109	}
	110
	111	static void __exit nf_tables_ipv4_exit(void)
	112	{
99633ab2	113	unregister_pernet_subsys(&nf_tables_ipv4_net_ops);
9370761c	114	nft_unregister_chain_type(&filter_ipv4);
96518518 PM	115	}
	116
	117	module_init(nf_tables_ipv4_init);
	118	module_exit(nf_tables_ipv4_exit);
	119
	120	MODULE_LICENSE("GPL");
	121	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	122	MODULE_ALIAS_NFT_FAMILY(AF_INET);