1/*
2 * (C) 2014 by Pablo Neira Ayuso <pablo@netfilter.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/module.h>
10#include <linux/spinlock.h>
11#include <linux/skbuff.h>
12#include <linux/if_bridge.h>
13#include <linux/ip.h>
14#include <net/route.h>
15
16#include <linux/netfilter.h>
17#include <net/netfilter/nf_log.h>
18
19static void nf_log_bridge_packet(struct net *net, u_int8_t pf,
20				 unsigned int hooknum,
21				 const struct sk_buff *skb,
22				 const struct net_device *in,
23				 const struct net_device *out,
24				 const struct nf_loginfo *loginfo,
25				 const char *prefix)
26{
27	switch (eth_hdr(skb)->h_proto) {
28	case htons(ETH_P_IP):
29		nf_log_packet(net, NFPROTO_IPV4, hooknum, skb, in, out,
30			      loginfo, "%s", prefix);
31		break;
32	case htons(ETH_P_IPV6):
33		nf_log_packet(net, NFPROTO_IPV6, hooknum, skb, in, out,
34			      loginfo, "%s", prefix);
35		break;
36	case htons(ETH_P_ARP):
37	case htons(ETH_P_RARP):
38		nf_log_packet(net, NFPROTO_ARP, hooknum, skb, in, out,
39			      loginfo, "%s", prefix);
40		break;
41	}
42}
43
44static struct nf_logger nf_bridge_logger __read_mostly = {
45	.name		= "nf_log_bridge",
46	.type		= NF_LOG_TYPE_LOG,
47	.logfn		= nf_log_bridge_packet,
48	.me		= THIS_MODULE,
49};
50
51static int __net_init nf_log_bridge_net_init(struct net *net)
52{
53	nf_log_set(net, NFPROTO_BRIDGE, &nf_bridge_logger);
54	return 0;
55}
56
57static void __net_exit nf_log_bridge_net_exit(struct net *net)
58{
59	nf_log_unset(net, &nf_bridge_logger);
60}
61
62static struct pernet_operations nf_log_bridge_net_ops = {
63	.init = nf_log_bridge_net_init,
64	.exit = nf_log_bridge_net_exit,
65};
66
67static int __init nf_log_bridge_init(void)
68{
69	int ret;
70
71	/* Request to load the real packet loggers. */
72	nf_logger_request_module(NFPROTO_IPV4, NF_LOG_TYPE_LOG);
73	nf_logger_request_module(NFPROTO_IPV6, NF_LOG_TYPE_LOG);
74	nf_logger_request_module(NFPROTO_ARP, NF_LOG_TYPE_LOG);
75
76	ret = register_pernet_subsys(&nf_log_bridge_net_ops);
77	if (ret < 0)
78		return ret;
79
80	nf_log_register(NFPROTO_BRIDGE, &nf_bridge_logger);
81	return 0;
82}
83
84static void __exit nf_log_bridge_exit(void)
85{
86	unregister_pernet_subsys(&nf_log_bridge_net_ops);
87	nf_log_unregister(&nf_bridge_logger);
88}
89
90module_init(nf_log_bridge_init);
91module_exit(nf_log_bridge_exit);
92
93MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
94MODULE_DESCRIPTION("Netfilter bridge packet logging");
95MODULE_LICENSE("GPL");
96MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 0);
97