Commit ed683f13 authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: nf_tables: add ARP filtering support 



This patch registers the ARP family and he filter chain type
for this family.

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent b5bc89bf

include/net/netns/nftables.h

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ struct netns_nftables { 
	struct list_head	commit_list;

	struct nft_af_info	*ipv4;

	struct nft_af_info	*ipv6;

	struct nft_af_info	*arp;

	struct nft_af_info	*bridge;

	u8			gencursor;

	u8			genctr;

net/ipv4/netfilter/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -53,6 +53,10 @@ config NFT_CHAIN_NAT_IPV4 
	depends on NF_NAT_IPV4 && NFT_NAT

	tristate "IPv4 nf_tables nat chain support"



config NF_TABLES_ARP

	depends on NF_TABLES

	tristate "ARP nf_tables support"



config IP_NF_IPTABLES

	tristate "IP tables support (required for filtering/masq/NAT)"

	default m if NETFILTER_ADVANCED=n

net/ipv4/netfilter/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ obj-$(CONFIG_NF_TABLES_IPV4) += nf_tables_ipv4.o 
obj-$(CONFIG_NFT_REJECT_IPV4) += nft_reject_ipv4.o

obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV4) += nft_chain_route_ipv4.o

obj-$(CONFIG_NFT_CHAIN_NAT_IPV4) += nft_chain_nat_ipv4.o

obj-$(CONFIG_NF_TABLES_ARP) += nf_tables_arp.o



# generic IP tables 

obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o

net/ipv4/netfilter/nf_tables_arp.c

0 → 100644
+102 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2008-2010 Patrick McHardy <kaber@trash.net>

 * Copyright (c) 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/module.h>

#include <linux/init.h>

#include <linux/netfilter_arp.h>

#include <net/netfilter/nf_tables.h>



static struct nft_af_info nft_af_arp __read_mostly = {

	.family		= NFPROTO_ARP,

	.nhooks		= NF_ARP_NUMHOOKS,

	.owner		= THIS_MODULE,

};



static int nf_tables_arp_init_net(struct net *net)

{

	net->nft.arp = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);

	if (net->nft.arp== NULL)

		return -ENOMEM;



	memcpy(net->nft.arp, &nft_af_arp, sizeof(nft_af_arp));



	if (nft_register_afinfo(net, net->nft.arp) < 0)

		goto err;



	return 0;

err:

	kfree(net->nft.arp);

	return -ENOMEM;

}



static void nf_tables_arp_exit_net(struct net *net)

{

	nft_unregister_afinfo(net->nft.arp);

	kfree(net->nft.arp);

}



static struct pernet_operations nf_tables_arp_net_ops = {

	.init   = nf_tables_arp_init_net,

	.exit   = nf_tables_arp_exit_net,

};



static unsigned int

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



	return nft_do_chain_pktinfo(&pkt, ops);

}



static struct nf_chain_type filter_arp = {

	.family		= NFPROTO_ARP,

	.name		= "filter",

	.type		= NFT_CHAIN_T_DEFAULT,

	.hook_mask	= (1 << NF_ARP_IN) |

			  (1 << NF_ARP_OUT) |

			  (1 << NF_ARP_FORWARD),

	.fn		= {

		[NF_ARP_IN]		= nft_do_chain_arp,

		[NF_ARP_OUT]		= nft_do_chain_arp,

		[NF_ARP_FORWARD]	= nft_do_chain_arp,

	},

};



static int __init nf_tables_arp_init(void)

{

	int ret;



	nft_register_chain_type(&filter_arp);

	ret = register_pernet_subsys(&nf_tables_arp_net_ops);

	if (ret < 0)

		nft_unregister_chain_type(&filter_arp);



	return ret;

}



static void __exit nf_tables_arp_exit(void)

{

	unregister_pernet_subsys(&nf_tables_arp_net_ops);

	nft_unregister_chain_type(&filter_arp);

}



module_init(nf_tables_arp_init);

module_exit(nf_tables_arp_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");

MODULE_ALIAS_NFT_FAMILY(3); /* NFPROTO_ARP */