netfilter: nf_log: add packet logging for netdev family

Move layer 2 packet logging into nf_log_l2packet() that resides in
nf_log_common.c, so this can be shared by both bridge and netdev
families.

This patch adds the boiler plate code to register the netdev logging
family.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 80 insertions, 0 deletions

diff --git a/net/netfilter/nf_log_netdev.c b/net/netfilter/nf_log_netdev.c
new file mode 100644
index 000000000000..1f645949f3d8
--- /dev/null
+++ b/net/netfilter/nf_log_netdev.c
@@ -0,0 +1,80 @@
+/*
+ * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/route.h>
+
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_log.h>
+
+static void nf_log_netdev_packet(struct net *net, u_int8_t pf,
+				 unsigned int hooknum,
+				 const struct sk_buff *skb,
+				 const struct net_device *in,
+				 const struct net_device *out,
+				 const struct nf_loginfo *loginfo,
+				 const char *prefix)
+{
+	nf_log_l2packet(net, pf, hooknum, skb, in, out, loginfo, prefix);
+}
+
+static struct nf_logger nf_netdev_logger __read_mostly = {
+	.name		= "nf_log_netdev",
+	.type		= NF_LOG_TYPE_LOG,
+	.logfn		= nf_log_netdev_packet,
+	.me		= THIS_MODULE,
+};
+
+static int __net_init nf_log_netdev_net_init(struct net *net)
+{
+	return nf_log_set(net, NFPROTO_NETDEV, &nf_netdev_logger);
+}
+
+static void __net_exit nf_log_netdev_net_exit(struct net *net)
+{
+	nf_log_unset(net, &nf_netdev_logger);
+}
+
+static struct pernet_operations nf_log_netdev_net_ops = {
+	.init = nf_log_netdev_net_init,
+	.exit = nf_log_netdev_net_exit,
+};
+
+static int __init nf_log_netdev_init(void)
+{
+	int ret;
+
+	/* Request to load the real packet loggers. */
+	nf_logger_request_module(NFPROTO_IPV4, NF_LOG_TYPE_LOG);
+	nf_logger_request_module(NFPROTO_IPV6, NF_LOG_TYPE_LOG);
+	nf_logger_request_module(NFPROTO_ARP, NF_LOG_TYPE_LOG);
+
+	ret = register_pernet_subsys(&nf_log_netdev_net_ops);
+	if (ret < 0)
+		return ret;
+
+	nf_log_register(NFPROTO_NETDEV, &nf_netdev_logger);
+	return 0;
+}
+
+static void __exit nf_log_netdev_exit(void)
+{
+	unregister_pernet_subsys(&nf_log_netdev_net_ops);
+	nf_log_unregister(&nf_netdev_logger);
+}
+
+module_init(nf_log_netdev_init);
+module_exit(nf_log_netdev_exit);
+
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_DESCRIPTION("Netfilter netdev packet logging");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NF_LOGGER(5, 0); /* NFPROTO_NETDEV */