[linux.git] / net / l2tp / l2tp_eth.c

/*
 * L2TPv3 ethernet pseudowire driver
 *
 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/hash.h>
#include <linux/l2tp.h>
#include <linux/in.h>
#include <linux/etherdevice.h>
#include <linux/spinlock.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/inet_common.h>
#include <net/inet_hashtables.h>
#include <net/tcp_states.h>
#include <net/protocol.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>

#include "l2tp_core.h"

/* Default device name. May be overridden by name specified by user */
#define L2TP_ETH_DEV_NAME	"l2tpeth%d"

/* via netdev_priv() */
struct l2tp_eth {
	struct net_device	*dev;
	struct sock		*tunnel_sock;
	struct l2tp_session	*session;
	struct list_head	list;
	atomic_long_t		tx_bytes;
	atomic_long_t		tx_packets;
	atomic_long_t		tx_dropped;
	atomic_long_t		rx_bytes;
	atomic_long_t		rx_packets;
	atomic_long_t		rx_errors;
};

/* via l2tp_session_priv() */
struct l2tp_eth_sess {
	struct net_device	*dev;
};

/* per-net private data for this module */
static unsigned int l2tp_eth_net_id;
struct l2tp_eth_net {
	struct list_head l2tp_eth_dev_list;
	spinlock_t l2tp_eth_lock;
};

static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
{
	return net_generic(net, l2tp_eth_net_id);
}

static struct lock_class_key l2tp_eth_tx_busylock;
static int l2tp_eth_dev_init(struct net_device *dev)
{
	struct l2tp_eth *priv = netdev_priv(dev);

	priv->dev = dev;
	eth_hw_addr_random(dev);
	memset(&dev->broadcast[0], 0xff, 6);
	dev->qdisc_tx_busylock = &l2tp_eth_tx_busylock;
	return 0;
}

static void l2tp_eth_dev_uninit(struct net_device *dev)
{
	struct l2tp_eth *priv = netdev_priv(dev);
	struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));

	spin_lock(&pn->l2tp_eth_lock);
	list_del_init(&priv->list);
	spin_unlock(&pn->l2tp_eth_lock);
	dev_put(dev);
}

static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct l2tp_eth *priv = netdev_priv(dev);
	struct l2tp_session *session = priv->session;
	unsigned int len = skb->len;
	int ret = l2tp_xmit_skb(session, skb, session->hdr_len);

	if (likely(ret == NET_XMIT_SUCCESS)) {
		atomic_long_add(len, &priv->tx_bytes);
		atomic_long_inc(&priv->tx_packets);
	} else {
		atomic_long_inc(&priv->tx_dropped);
	}
	return NETDEV_TX_OK;
}

static struct rtnl_link_stats64 *l2tp_eth_get_stats64(struct net_device *dev,
						      struct rtnl_link_stats64 *stats)
{
	struct l2tp_eth *priv = netdev_priv(dev);

	stats->tx_bytes   = atomic_long_read(&priv->tx_bytes);
	stats->tx_packets = atomic_long_read(&priv->tx_packets);
	stats->tx_dropped = atomic_long_read(&priv->tx_dropped);
	stats->rx_bytes   = atomic_long_read(&priv->rx_bytes);
	stats->rx_packets = atomic_long_read(&priv->rx_packets);
	stats->rx_errors  = atomic_long_read(&priv->rx_errors);
	return stats;
}


static struct net_device_ops l2tp_eth_netdev_ops = {
	.ndo_init		= l2tp_eth_dev_init,
	.ndo_uninit		= l2tp_eth_dev_uninit,
	.ndo_start_xmit		= l2tp_eth_dev_xmit,
	.ndo_get_stats64	= l2tp_eth_get_stats64,
};

static void l2tp_eth_dev_setup(struct net_device *dev)
{
	ether_setup(dev);
	dev->priv_flags		&= ~IFF_TX_SKB_SHARING;
	dev->features		|= NETIF_F_LLTX;
	dev->netdev_ops		= &l2tp_eth_netdev_ops;
	dev->destructor		= free_netdev;
}

static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
{
	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	struct net_device *dev = spriv->dev;
	struct l2tp_eth *priv = netdev_priv(dev);

	if (session->debug & L2TP_MSG_DATA) {
		unsigned int length;

		length = min(32u, skb->len);
		if (!pskb_may_pull(skb, length))
			goto error;

		pr_debug("%s: eth recv\n", session->name);
		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
	}

	if (!pskb_may_pull(skb, ETH_HLEN))
		goto error;

	secpath_reset(skb);

	/* checksums verified by L2TP */
	skb->ip_summed = CHECKSUM_NONE;

	skb_dst_drop(skb);
	nf_reset(skb);

	if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
		atomic_long_inc(&priv->rx_packets);
		atomic_long_add(data_len, &priv->rx_bytes);
	} else {
		atomic_long_inc(&priv->rx_errors);
	}
	return;

error:
	atomic_long_inc(&priv->rx_errors);
	kfree_skb(skb);
}

static void l2tp_eth_delete(struct l2tp_session *session)
{
	struct l2tp_eth_sess *spriv;
	struct net_device *dev;

	if (session) {
		spriv = l2tp_session_priv(session);
		dev = spriv->dev;
		if (dev) {
			unregister_netdev(dev);
			spriv->dev = NULL;
			module_put(THIS_MODULE);
		}
	}
}

#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
static void l2tp_eth_show(struct seq_file *m, void *arg)
{
	struct l2tp_session *session = arg;
	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	struct net_device *dev = spriv->dev;

	seq_printf(m, "   interface %s\n", dev->name);
}
#endif

static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
{
	struct net_device *dev;
	char name[IFNAMSIZ];
	struct l2tp_tunnel *tunnel;
	struct l2tp_session *session;
	struct l2tp_eth *priv;
	struct l2tp_eth_sess *spriv;
	int rc;
	struct l2tp_eth_net *pn;

	tunnel = l2tp_tunnel_find(net, tunnel_id);
	if (!tunnel) {
		rc = -ENODEV;
		goto out;
	}

	session = l2tp_session_find(net, tunnel, session_id);
	if (session) {
		rc = -EEXIST;
		goto out;
	}

	if (cfg->ifname) {
		dev = dev_get_by_name(net, cfg->ifname);
		if (dev) {
			dev_put(dev);
			rc = -EEXIST;
			goto out;
		}
		strlcpy(name, cfg->ifname, IFNAMSIZ);
	} else
		strcpy(name, L2TP_ETH_DEV_NAME);

	session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
				      peer_session_id, cfg);
	if (!session) {
		rc = -ENOMEM;
		goto out;
	}

	dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup);
	if (!dev) {
		rc = -ENOMEM;
		goto out_del_session;
	}

	dev_net_set(dev, net);
	if (session->mtu == 0)
		session->mtu = dev->mtu - session->hdr_len;
	dev->mtu = session->mtu;
	dev->needed_headroom += session->hdr_len;

	priv = netdev_priv(dev);
	priv->dev = dev;
	priv->session = session;
	INIT_LIST_HEAD(&priv->list);

	priv->tunnel_sock = tunnel->sock;
	session->recv_skb = l2tp_eth_dev_recv;
	session->session_close = l2tp_eth_delete;
#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
	session->show = l2tp_eth_show;
#endif

	spriv = l2tp_session_priv(session);
	spriv->dev = dev;

	rc = register_netdev(dev);
	if (rc < 0)
		goto out_del_dev;

	__module_get(THIS_MODULE);
	/* Must be done after register_netdev() */
	strlcpy(session->ifname, dev->name, IFNAMSIZ);

	dev_hold(dev);
	pn = l2tp_eth_pernet(dev_net(dev));
	spin_lock(&pn->l2tp_eth_lock);
	list_add(&priv->list, &pn->l2tp_eth_dev_list);
	spin_unlock(&pn->l2tp_eth_lock);

	return 0;

out_del_dev:
	free_netdev(dev);
	spriv->dev = NULL;
out_del_session:
	l2tp_session_delete(session);
out:
	return rc;
}

static __net_init int l2tp_eth_init_net(struct net *net)
{
	struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);

	INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
	spin_lock_init(&pn->l2tp_eth_lock);

	return 0;
}

static struct pernet_operations l2tp_eth_net_ops = {
	.init = l2tp_eth_init_net,
	.id   = &l2tp_eth_net_id,
	.size = sizeof(struct l2tp_eth_net),
};


static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
	.session_create	= l2tp_eth_create,
	.session_delete	= l2tp_session_delete,
};


static int __init l2tp_eth_init(void)
{
	int err = 0;

	err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
	if (err)
		goto out;

	err = register_pernet_device(&l2tp_eth_net_ops);
	if (err)
		goto out_unreg;

	pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");

	return 0;

out_unreg:
	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
out:
	return err;
}

static void __exit l2tp_eth_exit(void)
{
	unregister_pernet_device(&l2tp_eth_net_ops);
	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
}

module_init(l2tp_eth_init);
module_exit(l2tp_eth_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Chapman <[email protected]>");
MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
MODULE_VERSION("1.0");
Commit	Line	Data
d9e31d17 JC	1	/*
	2	* L2TPv3 ethernet pseudowire driver
	3	*
	4	* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
a4ca44fa JP	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a4ca44fa JP	13
d9e31d17 JC	14	#include <linux/module.h>
	15	#include <linux/skbuff.h>
	16	#include <linux/socket.h>
	17	#include <linux/hash.h>
	18	#include <linux/l2tp.h>
	19	#include <linux/in.h>
	20	#include <linux/etherdevice.h>
	21	#include <linux/spinlock.h>
	22	#include <net/sock.h>
	23	#include <net/ip.h>
	24	#include <net/icmp.h>
	25	#include <net/udp.h>
	26	#include <net/inet_common.h>
	27	#include <net/inet_hashtables.h>
	28	#include <net/tcp_states.h>
	29	#include <net/protocol.h>
	30	#include <net/xfrm.h>
	31	#include <net/net_namespace.h>
	32	#include <net/netns/generic.h>
	33
	34	#include "l2tp_core.h"
	35
	36	/* Default device name. May be overridden by name specified by user */
	37	#define L2TP_ETH_DEV_NAME "l2tpeth%d"
	38
	39	/* via netdev_priv() */
	40	struct l2tp_eth {
	41	struct net_device *dev;
	42	struct sock *tunnel_sock;
	43	struct l2tp_session *session;
	44	struct list_head list;
a2842a1e ED	45	atomic_long_t tx_bytes;
a2842a1e ED	46	atomic_long_t tx_packets;
b8c84307	47	atomic_long_t tx_dropped;
a2842a1e ED	48	atomic_long_t rx_bytes;
	49	atomic_long_t rx_packets;
	50	atomic_long_t rx_errors;
d9e31d17 JC	51	};
	52
	53	/* via l2tp_session_priv() */
	54	struct l2tp_eth_sess {
	55	struct net_device *dev;
	56	};
	57
	58	/* per-net private data for this module */
	59	static unsigned int l2tp_eth_net_id;
	60	struct l2tp_eth_net {
	61	struct list_head l2tp_eth_dev_list;
	62	spinlock_t l2tp_eth_lock;
	63	};
	64
	65	static inline struct l2tp_eth_net l2tp_eth_pernet(struct net net)
	66	{
	67	return net_generic(net, l2tp_eth_net_id);
	68	}
	69
23d3b8bf	70	static struct lock_class_key l2tp_eth_tx_busylock;
d9e31d17 JC	71	static int l2tp_eth_dev_init(struct net_device *dev)
	72	{
	73	struct l2tp_eth *priv = netdev_priv(dev);
	74
	75	priv->dev = dev;
f2cedb63	76	eth_hw_addr_random(dev);
d9e31d17	77	memset(&dev->broadcast[0], 0xff, 6);
23d3b8bf	78	dev->qdisc_tx_busylock = &l2tp_eth_tx_busylock;
d9e31d17 JC	79	return 0;
	80	}
	81
	82	static void l2tp_eth_dev_uninit(struct net_device *dev)
	83	{
	84	struct l2tp_eth *priv = netdev_priv(dev);
	85	struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
	86
	87	spin_lock(&pn->l2tp_eth_lock);
	88	list_del_init(&priv->list);
	89	spin_unlock(&pn->l2tp_eth_lock);
	90	dev_put(dev);
	91	}
	92
	93	static int l2tp_eth_dev_xmit(struct sk_buff skb, struct net_device dev)
	94	{
	95	struct l2tp_eth *priv = netdev_priv(dev);
	96	struct l2tp_session *session = priv->session;
b8c84307 ED	97	unsigned int len = skb->len;
	98	int ret = l2tp_xmit_skb(session, skb, session->hdr_len);
	99
	100	if (likely(ret == NET_XMIT_SUCCESS)) {
	101	atomic_long_add(len, &priv->tx_bytes);
	102	atomic_long_inc(&priv->tx_packets);
	103	} else {
	104	atomic_long_inc(&priv->tx_dropped);
	105	}
aa214de0	106	return NETDEV_TX_OK;
d9e31d17 JC	107	}
d9e31d17 JC	108
a2842a1e ED	109	static struct rtnl_link_stats64 l2tp_eth_get_stats64(struct net_device dev,
	110	struct rtnl_link_stats64 *stats)
	111	{
	112	struct l2tp_eth *priv = netdev_priv(dev);
	113
	114	stats->tx_bytes = atomic_long_read(&priv->tx_bytes);
	115	stats->tx_packets = atomic_long_read(&priv->tx_packets);
b8c84307	116	stats->tx_dropped = atomic_long_read(&priv->tx_dropped);
a2842a1e ED	117	stats->rx_bytes = atomic_long_read(&priv->rx_bytes);
	118	stats->rx_packets = atomic_long_read(&priv->rx_packets);
	119	stats->rx_errors = atomic_long_read(&priv->rx_errors);
	120	return stats;
	121	}
	122
	123
d9e31d17 JC	124	static struct net_device_ops l2tp_eth_netdev_ops = {
	125	.ndo_init = l2tp_eth_dev_init,
	126	.ndo_uninit = l2tp_eth_dev_uninit,
	127	.ndo_start_xmit = l2tp_eth_dev_xmit,
a2842a1e	128	.ndo_get_stats64 = l2tp_eth_get_stats64,
d9e31d17 JC	129	};
	130
	131	static void l2tp_eth_dev_setup(struct net_device *dev)
	132	{
	133	ether_setup(dev);
a2842a1e ED	134	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
a2842a1e ED	135	dev->features \|= NETIF_F_LLTX;
d9e31d17 JC	136	dev->netdev_ops = &l2tp_eth_netdev_ops;
	137	dev->destructor = free_netdev;
	138	}
	139
	140	static void l2tp_eth_dev_recv(struct l2tp_session session, struct sk_buff skb, int data_len)
	141	{
	142	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	143	struct net_device *dev = spriv->dev;
a2842a1e	144	struct l2tp_eth *priv = netdev_priv(dev);
d9e31d17 JC	145
	146	if (session->debug & L2TP_MSG_DATA) {
	147	unsigned int length;
d9e31d17 JC	148
	149	length = min(32u, skb->len);
	150	if (!pskb_may_pull(skb, length))
	151	goto error;
	152
a4ca44fa	153	pr_debug("%s: eth recv\n", session->name);
a2842a1e	154	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
d9e31d17 JC	155	}
d9e31d17 JC	156
c0cc88a7	157	if (!pskb_may_pull(skb, ETH_HLEN))
d9e31d17 JC	158	goto error;
	159
	160	secpath_reset(skb);
	161
	162	/* checksums verified by L2TP */
	163	skb->ip_summed = CHECKSUM_NONE;
	164
	165	skb_dst_drop(skb);
	166	nf_reset(skb);
	167
	168	if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
a2842a1e ED	169	atomic_long_inc(&priv->rx_packets);
	170	atomic_long_add(data_len, &priv->rx_bytes);
	171	} else {
	172	atomic_long_inc(&priv->rx_errors);
	173	}
d9e31d17 JC	174	return;
	175
	176	error:
a2842a1e	177	atomic_long_inc(&priv->rx_errors);
d9e31d17 JC	178	kfree_skb(skb);
	179	}
	180
	181	static void l2tp_eth_delete(struct l2tp_session *session)
	182	{
	183	struct l2tp_eth_sess *spriv;
	184	struct net_device *dev;
	185
	186	if (session) {
	187	spriv = l2tp_session_priv(session);
	188	dev = spriv->dev;
	189	if (dev) {
	190	unregister_netdev(dev);
	191	spriv->dev = NULL;
a06998b8	192	module_put(THIS_MODULE);
d9e31d17 JC	193	}
	194	}
	195	}
	196
f66ef2d0	197	#if defined(CONFIG_L2TP_DEBUGFS) \|\| defined(CONFIG_L2TP_DEBUGFS_MODULE)
0ad66140 JC	198	static void l2tp_eth_show(struct seq_file m, void arg)
	199	{
	200	struct l2tp_session *session = arg;
	201	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	202	struct net_device *dev = spriv->dev;
	203
	204	seq_printf(m, " interface %s\n", dev->name);
	205	}
	206	#endif
	207
d9e31d17 JC	208	static int l2tp_eth_create(struct net net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg cfg)
	209	{
	210	struct net_device *dev;
	211	char name[IFNAMSIZ];
	212	struct l2tp_tunnel *tunnel;
	213	struct l2tp_session *session;
	214	struct l2tp_eth *priv;
	215	struct l2tp_eth_sess *spriv;
	216	int rc;
	217	struct l2tp_eth_net *pn;
	218
	219	tunnel = l2tp_tunnel_find(net, tunnel_id);
	220	if (!tunnel) {
	221	rc = -ENODEV;
	222	goto out;
	223	}
	224
	225	session = l2tp_session_find(net, tunnel, session_id);
	226	if (session) {
	227	rc = -EEXIST;
	228	goto out;
	229	}
	230
	231	if (cfg->ifname) {
	232	dev = dev_get_by_name(net, cfg->ifname);
	233	if (dev) {
	234	dev_put(dev);
	235	rc = -EEXIST;
	236	goto out;
	237	}
	238	strlcpy(name, cfg->ifname, IFNAMSIZ);
	239	} else
	240	strcpy(name, L2TP_ETH_DEV_NAME);
	241
	242	session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
	243	peer_session_id, cfg);
	244	if (!session) {
	245	rc = -ENOMEM;
	246	goto out;
	247	}
	248
	249	dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup);
	250	if (!dev) {
	251	rc = -ENOMEM;
	252	goto out_del_session;
	253	}
	254
	255	dev_net_set(dev, net);
	256	if (session->mtu == 0)
	257	session->mtu = dev->mtu - session->hdr_len;
	258	dev->mtu = session->mtu;
	259	dev->needed_headroom += session->hdr_len;
	260
	261	priv = netdev_priv(dev);
	262	priv->dev = dev;
	263	priv->session = session;
	264	INIT_LIST_HEAD(&priv->list);
	265
	266	priv->tunnel_sock = tunnel->sock;
	267	session->recv_skb = l2tp_eth_dev_recv;
	268	session->session_close = l2tp_eth_delete;
f66ef2d0	269	#if defined(CONFIG_L2TP_DEBUGFS) \|\| defined(CONFIG_L2TP_DEBUGFS_MODULE)
0ad66140 JC	270	session->show = l2tp_eth_show;
0ad66140 JC	271	#endif
d9e31d17 JC	272
	273	spriv = l2tp_session_priv(session);
	274	spriv->dev = dev;
	275
	276	rc = register_netdev(dev);
	277	if (rc < 0)
	278	goto out_del_dev;
	279
a06998b8	280	__module_get(THIS_MODULE);
d9e31d17 JC	281	/* Must be done after register_netdev() */
	282	strlcpy(session->ifname, dev->name, IFNAMSIZ);
	283
	284	dev_hold(dev);
	285	pn = l2tp_eth_pernet(dev_net(dev));
	286	spin_lock(&pn->l2tp_eth_lock);
	287	list_add(&priv->list, &pn->l2tp_eth_dev_list);
	288	spin_unlock(&pn->l2tp_eth_lock);
	289
	290	return 0;
	291
	292	out_del_dev:
	293	free_netdev(dev);
78933636	294	spriv->dev = NULL;
d9e31d17 JC	295	out_del_session:
	296	l2tp_session_delete(session);
	297	out:
	298	return rc;
	299	}
	300
	301	static __net_init int l2tp_eth_init_net(struct net *net)
	302	{
3a737028	303	struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
d9e31d17 JC	304
	305	INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
	306	spin_lock_init(&pn->l2tp_eth_lock);
	307
d9e31d17	308	return 0;
d9e31d17 JC	309	}
d9e31d17 JC	310
8aa525a9	311	static struct pernet_operations l2tp_eth_net_ops = {
d9e31d17	312	.init = l2tp_eth_init_net,
d9e31d17 JC	313	.id = &l2tp_eth_net_id,
	314	.size = sizeof(struct l2tp_eth_net),
	315	};
	316
	317
	318	static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
	319	.session_create = l2tp_eth_create,
	320	.session_delete = l2tp_session_delete,
	321	};
	322
	323
	324	static int __init l2tp_eth_init(void)
	325	{
	326	int err = 0;
	327
	328	err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
	329	if (err)
	330	goto out;
	331
	332	err = register_pernet_device(&l2tp_eth_net_ops);
	333	if (err)
	334	goto out_unreg;
	335
a4ca44fa	336	pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
d9e31d17 JC	337
	338	return 0;
	339
	340	out_unreg:
	341	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	342	out:
	343	return err;
	344	}
	345
	346	static void __exit l2tp_eth_exit(void)
	347	{
	348	unregister_pernet_device(&l2tp_eth_net_ops);
	349	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	350	}
	351
	352	module_init(l2tp_eth_init);
	353	module_exit(l2tp_eth_exit);
	354
	355	MODULE_LICENSE("GPL");
	356	MODULE_AUTHOR("James Chapman <[email protected]>");
	357	MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
	358	MODULE_VERSION("1.0");