1/*
2 * Copyright (c) 2008-2010 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2013 Pablo Neira Ayuso <pablo@netfilter.org>
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/module.h>
13#include <linux/init.h>
14#include <linux/netfilter_arp.h>
15#include <net/netfilter/nf_tables.h>
16
17static unsigned int
18nft_do_chain_arp(const struct nf_hook_ops *ops,
19		  struct sk_buff *skb,
20		  const struct net_device *in,
21		  const struct net_device *out,
22		  int (*okfn)(struct sk_buff *))
23{
24	struct nft_pktinfo pkt;
25
26	nft_set_pktinfo(&pkt, ops, skb, in, out);
27
28	return nft_do_chain(&pkt, ops);
29}
30
31static struct nft_af_info nft_af_arp __read_mostly = {
32	.family		= NFPROTO_ARP,
33	.nhooks		= NF_ARP_NUMHOOKS,
34	.owner		= THIS_MODULE,
35	.nops		= 1,
36	.hooks		= {
37		[NF_ARP_IN]		= nft_do_chain_arp,
38		[NF_ARP_OUT]		= nft_do_chain_arp,
39		[NF_ARP_FORWARD]	= nft_do_chain_arp,
40	},
41};
42
43static int nf_tables_arp_init_net(struct net *net)
44{
45	net->nft.arp = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
46	if (net->nft.arp== NULL)
47		return -ENOMEM;
48
49	memcpy(net->nft.arp, &nft_af_arp, sizeof(nft_af_arp));
50
51	if (nft_register_afinfo(net, net->nft.arp) < 0)
52		goto err;
53
54	return 0;
55err:
56	kfree(net->nft.arp);
57	return -ENOMEM;
58}
59
60static void nf_tables_arp_exit_net(struct net *net)
61{
62	nft_unregister_afinfo(net->nft.arp);
63	kfree(net->nft.arp);
64}
65
66static struct pernet_operations nf_tables_arp_net_ops = {
67	.init   = nf_tables_arp_init_net,
68	.exit   = nf_tables_arp_exit_net,
69};
70
71static const struct nf_chain_type filter_arp = {
72	.name		= "filter",
73	.type		= NFT_CHAIN_T_DEFAULT,
74	.family		= NFPROTO_ARP,
75	.owner		= THIS_MODULE,
76	.hook_mask	= (1 << NF_ARP_IN) |
77			  (1 << NF_ARP_OUT) |
78			  (1 << NF_ARP_FORWARD),
79};
80
81static int __init nf_tables_arp_init(void)
82{
83	int ret;
84
85	nft_register_chain_type(&filter_arp);
86	ret = register_pernet_subsys(&nf_tables_arp_net_ops);
87	if (ret < 0)
88		nft_unregister_chain_type(&filter_arp);
89
90	return ret;
91}
92
93static void __exit nf_tables_arp_exit(void)
94{
95	unregister_pernet_subsys(&nf_tables_arp_net_ops);
96	nft_unregister_chain_type(&filter_arp);
97}
98
99module_init(nf_tables_arp_init);
100module_exit(nf_tables_arp_exit);
101
102MODULE_LICENSE("GPL");
103MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
104MODULE_ALIAS_NFT_FAMILY(3); /* NFPROTO_ARP */
105