1/*
2 * Copyright (c) 2008 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/init.h>
13#include <linux/module.h>
14#include <linux/netfilter_bridge.h>
15#include <net/netfilter/nf_tables.h>
16
17static unsigned int
18nft_do_chain_bridge(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_bridge __read_mostly = {
32	.family		= NFPROTO_BRIDGE,
33	.nhooks		= NF_BR_NUMHOOKS,
34	.owner		= THIS_MODULE,
35	.nops		= 1,
36	.hooks		= {
37		[NF_BR_PRE_ROUTING]	= nft_do_chain_bridge,
38		[NF_BR_LOCAL_IN]	= nft_do_chain_bridge,
39		[NF_BR_FORWARD]		= nft_do_chain_bridge,
40		[NF_BR_LOCAL_OUT]	= nft_do_chain_bridge,
41		[NF_BR_POST_ROUTING]	= nft_do_chain_bridge,
42	},
43};
44
45static int nf_tables_bridge_init_net(struct net *net)
46{
47	net->nft.bridge = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
48	if (net->nft.bridge == NULL)
49		return -ENOMEM;
50
51	memcpy(net->nft.bridge, &nft_af_bridge, sizeof(nft_af_bridge));
52
53	if (nft_register_afinfo(net, net->nft.bridge) < 0)
54		goto err;
55
56	return 0;
57err:
58	kfree(net->nft.bridge);
59	return -ENOMEM;
60}
61
62static void nf_tables_bridge_exit_net(struct net *net)
63{
64	nft_unregister_afinfo(net->nft.bridge);
65	kfree(net->nft.bridge);
66}
67
68static struct pernet_operations nf_tables_bridge_net_ops = {
69	.init	= nf_tables_bridge_init_net,
70	.exit	= nf_tables_bridge_exit_net,
71};
72
73static const struct nf_chain_type filter_bridge = {
74	.name		= "filter",
75	.type		= NFT_CHAIN_T_DEFAULT,
76	.family		= NFPROTO_BRIDGE,
77	.owner		= THIS_MODULE,
78	.hook_mask	= (1 << NF_BR_PRE_ROUTING) |
79			  (1 << NF_BR_LOCAL_IN) |
80			  (1 << NF_BR_FORWARD) |
81			  (1 << NF_BR_LOCAL_OUT) |
82			  (1 << NF_BR_POST_ROUTING),
83};
84
85static int __init nf_tables_bridge_init(void)
86{
87	int ret;
88
89	nft_register_chain_type(&filter_bridge);
90	ret = register_pernet_subsys(&nf_tables_bridge_net_ops);
91	if (ret < 0)
92		nft_unregister_chain_type(&filter_bridge);
93
94	return ret;
95}
96
97static void __exit nf_tables_bridge_exit(void)
98{
99	unregister_pernet_subsys(&nf_tables_bridge_net_ops);
100	nft_unregister_chain_type(&filter_bridge);
101}
102
103module_init(nf_tables_bridge_init);
104module_exit(nf_tables_bridge_exit);
105
106MODULE_LICENSE("GPL");
107MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
108MODULE_ALIAS_NFT_FAMILY(AF_BRIDGE);
109