[mirror_ubuntu-bionic-kernel.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 int l2tp_eth_dev_init(struct net_device *dev)
{
	struct l2tp_eth *priv = netdev_priv(dev);

	priv->dev = dev;
	eth_hw_addr_random(dev);
	eth_broadcast_addr(dev->broadcast);
	netdev_lockdep_set_classes(dev);

	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 void 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);
}

static const 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,
	.ndo_set_mac_address	= eth_mac_addr,
};

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 IS_ENABLED(CONFIG_L2TP_DEBUGFS)
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;
	}

	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 (IS_ERR(session)) {
		rc = PTR_ERR(session);
		goto out;
	}

	dev = alloc_netdev(sizeof(*priv), name, NET_NAME_UNKNOWN,
			   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;
	dev->min_mtu = 0;
	dev->max_mtu = ETH_MAX_MTU;

	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 IS_ENABLED(CONFIG_L2TP_DEBUGFS)
	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 <jchapman@katalix.com>");
MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
MODULE_VERSION("1.0");
MODULE_ALIAS_L2TP_PWTYPE(5);
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
	70	static int l2tp_eth_dev_init(struct net_device *dev)
	71	{
	72	struct l2tp_eth *priv = netdev_priv(dev);
	73
	74	priv->dev = dev;
f2cedb63	75	eth_hw_addr_random(dev);
1cea7e2c	76	eth_broadcast_addr(dev->broadcast);
d3fff6c4	77	netdev_lockdep_set_classes(dev);
f9eb8aea	78
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
a4cd0271	100	if (likely(ret == NET_XMIT_SUCCESS)) {
b8c84307 ED	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
bc1f4470	109	static void l2tp_eth_get_stats64(struct net_device *dev,
bc1f4470	110	struct rtnl_link_stats64 *stats)
a2842a1e ED	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);
a2842a1e ED	120	}
a2842a1e ED	121
eb94737d	122	static const struct net_device_ops l2tp_eth_netdev_ops = {
d9e31d17 JC	123	.ndo_init = l2tp_eth_dev_init,
	124	.ndo_uninit = l2tp_eth_dev_uninit,
	125	.ndo_start_xmit = l2tp_eth_dev_xmit,
a2842a1e	126	.ndo_get_stats64 = l2tp_eth_get_stats64,
fe159122	127	.ndo_set_mac_address = eth_mac_addr,
d9e31d17 JC	128	};
	129
	130	static void l2tp_eth_dev_setup(struct net_device *dev)
	131	{
	132	ether_setup(dev);
a2842a1e ED	133	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
a2842a1e ED	134	dev->features \|= NETIF_F_LLTX;
d9e31d17 JC	135	dev->netdev_ops = &l2tp_eth_netdev_ops;
	136	dev->destructor = free_netdev;
	137	}
	138
	139	static void l2tp_eth_dev_recv(struct l2tp_session session, struct sk_buff skb, int data_len)
	140	{
	141	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	142	struct net_device *dev = spriv->dev;
a2842a1e	143	struct l2tp_eth *priv = netdev_priv(dev);
d9e31d17 JC	144
	145	if (session->debug & L2TP_MSG_DATA) {
	146	unsigned int length;
d9e31d17 JC	147
	148	length = min(32u, skb->len);
	149	if (!pskb_may_pull(skb, length))
	150	goto error;
	151
a4ca44fa	152	pr_debug("%s: eth recv\n", session->name);
a2842a1e	153	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
d9e31d17 JC	154	}
d9e31d17 JC	155
c0cc88a7	156	if (!pskb_may_pull(skb, ETH_HLEN))
d9e31d17 JC	157	goto error;
	158
	159	secpath_reset(skb);
	160
	161	/* checksums verified by L2TP */
	162	skb->ip_summed = CHECKSUM_NONE;
	163
	164	skb_dst_drop(skb);
	165	nf_reset(skb);
	166
	167	if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
a2842a1e ED	168	atomic_long_inc(&priv->rx_packets);
	169	atomic_long_add(data_len, &priv->rx_bytes);
	170	} else {
	171	atomic_long_inc(&priv->rx_errors);
	172	}
d9e31d17 JC	173	return;
	174
	175	error:
a2842a1e	176	atomic_long_inc(&priv->rx_errors);
d9e31d17 JC	177	kfree_skb(skb);
	178	}
	179
	180	static void l2tp_eth_delete(struct l2tp_session *session)
	181	{
	182	struct l2tp_eth_sess *spriv;
	183	struct net_device *dev;
	184
	185	if (session) {
	186	spriv = l2tp_session_priv(session);
	187	dev = spriv->dev;
	188	if (dev) {
	189	unregister_netdev(dev);
	190	spriv->dev = NULL;
a06998b8	191	module_put(THIS_MODULE);
d9e31d17 JC	192	}
	193	}
	194	}
	195
9dd79945	196	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	197	static void l2tp_eth_show(struct seq_file m, void arg)
	198	{
	199	struct l2tp_session *session = arg;
	200	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	201	struct net_device *dev = spriv->dev;
	202
	203	seq_printf(m, " interface %s\n", dev->name);
	204	}
	205	#endif
	206
d9e31d17 JC	207	static int l2tp_eth_create(struct net net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg cfg)
	208	{
	209	struct net_device *dev;
	210	char name[IFNAMSIZ];
	211	struct l2tp_tunnel *tunnel;
	212	struct l2tp_session *session;
	213	struct l2tp_eth *priv;
	214	struct l2tp_eth_sess *spriv;
	215	int rc;
	216	struct l2tp_eth_net *pn;
	217
	218	tunnel = l2tp_tunnel_find(net, tunnel_id);
	219	if (!tunnel) {
	220	rc = -ENODEV;
	221	goto out;
	222	}
	223
d9e31d17 JC	224	if (cfg->ifname) {
	225	dev = dev_get_by_name(net, cfg->ifname);
	226	if (dev) {
	227	dev_put(dev);
	228	rc = -EEXIST;
	229	goto out;
	230	}
	231	strlcpy(name, cfg->ifname, IFNAMSIZ);
	232	} else
	233	strcpy(name, L2TP_ETH_DEV_NAME);
	234
	235	session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
	236	peer_session_id, cfg);
dbdbc73b GN	237	if (IS_ERR(session)) {
dbdbc73b GN	238	rc = PTR_ERR(session);
d9e31d17 JC	239	goto out;
	240	}
	241
c835a677 TG	242	dev = alloc_netdev(sizeof(*priv), name, NET_NAME_UNKNOWN,
c835a677 TG	243	l2tp_eth_dev_setup);
d9e31d17 JC	244	if (!dev) {
	245	rc = -ENOMEM;
	246	goto out_del_session;
	247	}
	248
	249	dev_net_set(dev, net);
	250	if (session->mtu == 0)
	251	session->mtu = dev->mtu - session->hdr_len;
	252	dev->mtu = session->mtu;
	253	dev->needed_headroom += session->hdr_len;
8b1efc0f JW	254	dev->min_mtu = 0;
8b1efc0f JW	255	dev->max_mtu = ETH_MAX_MTU;
d9e31d17 JC	256
	257	priv = netdev_priv(dev);
	258	priv->dev = dev;
	259	priv->session = session;
	260	INIT_LIST_HEAD(&priv->list);
	261
	262	priv->tunnel_sock = tunnel->sock;
	263	session->recv_skb = l2tp_eth_dev_recv;
	264	session->session_close = l2tp_eth_delete;
9dd79945	265	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	266	session->show = l2tp_eth_show;
0ad66140 JC	267	#endif
d9e31d17 JC	268
	269	spriv = l2tp_session_priv(session);
	270	spriv->dev = dev;
	271
	272	rc = register_netdev(dev);
	273	if (rc < 0)
	274	goto out_del_dev;
	275
a06998b8	276	__module_get(THIS_MODULE);
d9e31d17 JC	277	/* Must be done after register_netdev() */
	278	strlcpy(session->ifname, dev->name, IFNAMSIZ);
	279
	280	dev_hold(dev);
	281	pn = l2tp_eth_pernet(dev_net(dev));
	282	spin_lock(&pn->l2tp_eth_lock);
	283	list_add(&priv->list, &pn->l2tp_eth_dev_list);
	284	spin_unlock(&pn->l2tp_eth_lock);
	285
	286	return 0;
	287
	288	out_del_dev:
	289	free_netdev(dev);
78933636	290	spriv->dev = NULL;
d9e31d17 JC	291	out_del_session:
	292	l2tp_session_delete(session);
	293	out:
	294	return rc;
	295	}
	296
	297	static __net_init int l2tp_eth_init_net(struct net *net)
	298	{
3a737028	299	struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
d9e31d17 JC	300
	301	INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
	302	spin_lock_init(&pn->l2tp_eth_lock);
	303
d9e31d17	304	return 0;
d9e31d17 JC	305	}
d9e31d17 JC	306
8aa525a9	307	static struct pernet_operations l2tp_eth_net_ops = {
d9e31d17	308	.init = l2tp_eth_init_net,
d9e31d17 JC	309	.id = &l2tp_eth_net_id,
	310	.size = sizeof(struct l2tp_eth_net),
	311	};
	312
	313
	314	static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
	315	.session_create = l2tp_eth_create,
	316	.session_delete = l2tp_session_delete,
	317	};
	318
	319
	320	static int __init l2tp_eth_init(void)
	321	{
	322	int err = 0;
	323
	324	err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
	325	if (err)
	326	goto out;
	327
	328	err = register_pernet_device(&l2tp_eth_net_ops);
	329	if (err)
	330	goto out_unreg;
	331
a4ca44fa	332	pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
d9e31d17 JC	333
	334	return 0;
	335
	336	out_unreg:
	337	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	338	out:
	339	return err;
	340	}
	341
	342	static void __exit l2tp_eth_exit(void)
	343	{
	344	unregister_pernet_device(&l2tp_eth_net_ops);
	345	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	346	}
	347
	348	module_init(l2tp_eth_init);
	349	module_exit(l2tp_eth_exit);
	350
	351	MODULE_LICENSE("GPL");
	352	MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
	353	MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
	354	MODULE_VERSION("1.0");
f1f39f91	355	MODULE_ALIAS_L2TP_PWTYPE(5);