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
17 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 *))18 nft_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
31 static 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
nf_tables_arp_init_net(struct net * net)43 static 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;
55 err:
56 kfree(net->nft.arp);
57 return -ENOMEM;
58 }
59
nf_tables_arp_exit_net(struct net * net)60 static void nf_tables_arp_exit_net(struct net *net)
61 {
62 nft_unregister_afinfo(net->nft.arp);
63 kfree(net->nft.arp);
64 }
65
66 static struct pernet_operations nf_tables_arp_net_ops = {
67 .init = nf_tables_arp_init_net,
68 .exit = nf_tables_arp_exit_net,
69 };
70
71 static 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
nf_tables_arp_init(void)81 static 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
nf_tables_arp_exit(void)93 static 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
99 module_init(nf_tables_arp_init);
100 module_exit(nf_tables_arp_exit);
101
102 MODULE_LICENSE("GPL");
103 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
104 MODULE_ALIAS_NFT_FAMILY(3); /* NFPROTO_ARP */
105