netfilter: nf_tables: add ARP filtering support
This patch registers the ARP family and he filter chain type for this family. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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@ -10,6 +10,7 @@ struct netns_nftables {
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struct list_head commit_list;
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struct nft_af_info *ipv4;
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struct nft_af_info *ipv6;
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struct nft_af_info *arp;
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struct nft_af_info *bridge;
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u8 gencursor;
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u8 genctr;
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@ -53,6 +53,10 @@ config NFT_CHAIN_NAT_IPV4
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depends on NF_NAT_IPV4 && NFT_NAT
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tristate "IPv4 nf_tables nat chain support"
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config NF_TABLES_ARP
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depends on NF_TABLES
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tristate "ARP nf_tables support"
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config IP_NF_IPTABLES
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tristate "IP tables support (required for filtering/masq/NAT)"
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default m if NETFILTER_ADVANCED=n
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@ -31,6 +31,7 @@ obj-$(CONFIG_NF_TABLES_IPV4) += nf_tables_ipv4.o
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obj-$(CONFIG_NFT_REJECT_IPV4) += nft_reject_ipv4.o
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obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV4) += nft_chain_route_ipv4.o
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obj-$(CONFIG_NFT_CHAIN_NAT_IPV4) += nft_chain_nat_ipv4.o
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obj-$(CONFIG_NF_TABLES_ARP) += nf_tables_arp.o
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# generic IP tables
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obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
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102
net/ipv4/netfilter/nf_tables_arp.c
Normal file
102
net/ipv4/netfilter/nf_tables_arp.c
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@ -0,0 +1,102 @@
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/*
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* Copyright (c) 2008-2010 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2013 Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netfilter_arp.h>
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#include <net/netfilter/nf_tables.h>
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static struct nft_af_info nft_af_arp __read_mostly = {
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.family = NFPROTO_ARP,
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.nhooks = NF_ARP_NUMHOOKS,
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.owner = THIS_MODULE,
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};
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static int nf_tables_arp_init_net(struct net *net)
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{
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net->nft.arp = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
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if (net->nft.arp== NULL)
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return -ENOMEM;
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memcpy(net->nft.arp, &nft_af_arp, sizeof(nft_af_arp));
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if (nft_register_afinfo(net, net->nft.arp) < 0)
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goto err;
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return 0;
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err:
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kfree(net->nft.arp);
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return -ENOMEM;
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}
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static void nf_tables_arp_exit_net(struct net *net)
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{
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nft_unregister_afinfo(net->nft.arp);
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kfree(net->nft.arp);
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}
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static struct pernet_operations nf_tables_arp_net_ops = {
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.init = nf_tables_arp_init_net,
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.exit = nf_tables_arp_exit_net,
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};
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static unsigned int
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nft_do_chain_arp(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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struct nft_pktinfo pkt;
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nft_set_pktinfo(&pkt, ops, skb, in, out);
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return nft_do_chain_pktinfo(&pkt, ops);
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}
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static struct nf_chain_type filter_arp = {
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.family = NFPROTO_ARP,
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.name = "filter",
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.type = NFT_CHAIN_T_DEFAULT,
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.hook_mask = (1 << NF_ARP_IN) |
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(1 << NF_ARP_OUT) |
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(1 << NF_ARP_FORWARD),
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.fn = {
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[NF_ARP_IN] = nft_do_chain_arp,
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[NF_ARP_OUT] = nft_do_chain_arp,
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[NF_ARP_FORWARD] = nft_do_chain_arp,
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},
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};
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static int __init nf_tables_arp_init(void)
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{
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int ret;
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nft_register_chain_type(&filter_arp);
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ret = register_pernet_subsys(&nf_tables_arp_net_ops);
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if (ret < 0)
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nft_unregister_chain_type(&filter_arp);
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return ret;
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}
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static void __exit nf_tables_arp_exit(void)
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{
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unregister_pernet_subsys(&nf_tables_arp_net_ops);
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nft_unregister_chain_type(&filter_arp);
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}
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module_init(nf_tables_arp_init);
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module_exit(nf_tables_arp_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_FAMILY(3); /* NFPROTO_ARP */
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