[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(void *priv,
				      struct sk_buff *skb,
				      const struct nf_hook_state *state)
{
	struct nft_pktinfo pkt;

	nft_set_pktinfo_ipv4(&pkt, skb, state);

	return nft_do_chain(&pkt, priv);
}

static unsigned int nft_ipv4_output(void *priv,
				    struct sk_buff *skb,
				    const struct nf_hook_state *state)
{
	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(priv, skb, state);
}

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, 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 const struct nf_chain_type filter_ipv4 = {
	.name		= "filter",
	.type		= NFT_CHAIN_T_DEFAULT,
	.family		= NFPROTO_IPV4,
	.owner		= THIS_MODULE,
	.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)
{
	int ret;

	ret = nft_register_chain_type(&filter_ipv4);
	if (ret < 0)
		return ret;

	ret = register_pernet_subsys(&nf_tables_ipv4_net_ops);
	if (ret < 0)
		nft_unregister_chain_type(&filter_ipv4);

	return ret;
}

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
06198b34	21	static unsigned int nft_do_chain_ipv4(void *priv,
3b088c4b	22	struct sk_buff *skb,
238e54c9	23	const struct nf_hook_state *state)
3b088c4b PM	24	{
	25	struct nft_pktinfo pkt;
	26
6aa187f2	27	nft_set_pktinfo_ipv4(&pkt, skb, state);
3b088c4b	28
06198b34	29	return nft_do_chain(&pkt, priv);
3b088c4b PM	30	}
3b088c4b PM	31
06198b34	32	static unsigned int nft_ipv4_output(void *priv,
96518518	33	struct sk_buff *skb,
238e54c9	34	const struct nf_hook_state *state)
96518518 PM	35	{
	36	if (unlikely(skb->len < sizeof(struct iphdr) \|\|
	37	ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
	38	if (net_ratelimit())
	39	pr_info("nf_tables_ipv4: ignoring short SOCK_RAW "
	40	"packet\n");
	41	return NF_ACCEPT;
	42	}
	43
06198b34	44	return nft_do_chain_ipv4(priv, skb, state);
96518518 PM	45	}
96518518 PM	46
1d49144c	47	struct nft_af_info nft_af_ipv4 __read_mostly = {
96518518 PM	48	.family = NFPROTO_IPV4,
	49	.nhooks = NF_INET_NUMHOOKS,
	50	.owner = THIS_MODULE,
115a60b1	51	.nops = 1,
96518518	52	.hooks = {
3b088c4b	53	[NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
96518518	54	[NF_INET_LOCAL_OUT] = nft_ipv4_output,
3b088c4b PM	55	[NF_INET_FORWARD] = nft_do_chain_ipv4,
	56	[NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
	57	[NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
96518518 PM	58	},
96518518 PM	59	};
1d49144c	60	EXPORT_SYMBOL_GPL(nft_af_ipv4);
96518518	61
99633ab2 PNA	62	static int nf_tables_ipv4_init_net(struct net *net)
	63	{
	64	net->nft.ipv4 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
	65	if (net->nft.ipv4 == NULL)
	66	return -ENOMEM;
	67
	68	memcpy(net->nft.ipv4, &nft_af_ipv4, sizeof(nft_af_ipv4));
	69
	70	if (nft_register_afinfo(net, net->nft.ipv4) < 0)
	71	goto err;
	72
	73	return 0;
	74	err:
	75	kfree(net->nft.ipv4);
	76	return -ENOMEM;
	77	}
	78
	79	static void nf_tables_ipv4_exit_net(struct net *net)
	80	{
df05ef87	81	nft_unregister_afinfo(net, net->nft.ipv4);
99633ab2 PNA	82	kfree(net->nft.ipv4);
	83	}
	84
	85	static struct pernet_operations nf_tables_ipv4_net_ops = {
	86	.init = nf_tables_ipv4_init_net,
	87	.exit = nf_tables_ipv4_exit_net,
	88	};
0ca743a5	89
2a37d755	90	static const struct nf_chain_type filter_ipv4 = {
9370761c PNA	91	.name = "filter",
9370761c PNA	92	.type = NFT_CHAIN_T_DEFAULT,
fa2c1de0 PM	93	.family = NFPROTO_IPV4,
fa2c1de0 PM	94	.owner = THIS_MODULE,
9370761c PNA	95	.hook_mask = (1 << NF_INET_LOCAL_IN) \|
	96	(1 << NF_INET_LOCAL_OUT) \|
	97	(1 << NF_INET_FORWARD) \|
	98	(1 << NF_INET_PRE_ROUTING) \|
	99	(1 << NF_INET_POST_ROUTING),
9370761c PNA	100	};
9370761c PNA	101
96518518 PM	102	static int __init nf_tables_ipv4_init(void)
96518518 PM	103	{
cf4dfa85 PNA	104	int ret;
cf4dfa85 PNA	105
23d07508 GF	106	ret = nft_register_chain_type(&filter_ipv4);
	107	if (ret < 0)
	108	return ret;
	109
cf4dfa85 PNA	110	ret = register_pernet_subsys(&nf_tables_ipv4_net_ops);
	111	if (ret < 0)
	112	nft_unregister_chain_type(&filter_ipv4);
	113
	114	return ret;
96518518 PM	115	}
	116
	117	static void __exit nf_tables_ipv4_exit(void)
	118	{
99633ab2	119	unregister_pernet_subsys(&nf_tables_ipv4_net_ops);
9370761c	120	nft_unregister_chain_type(&filter_ipv4);
96518518 PM	121	}
	122
	123	module_init(nf_tables_ipv4_init);
	124	module_exit(nf_tables_ipv4_exit);
	125
	126	MODULE_LICENSE("GPL");
	127	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	128	MODULE_ALIAS_NFT_FAMILY(AF_INET);