[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 <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/udp.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;
	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;
};


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)
{
	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   = (unsigned long) atomic_long_read(&priv->tx_bytes);
	stats->tx_packets = (unsigned long) atomic_long_read(&priv->tx_packets);
	stats->tx_dropped = (unsigned long) atomic_long_read(&priv->tx_dropped);
	stats->rx_bytes   = (unsigned long) atomic_long_read(&priv->rx_bytes);
	stats->rx_packets = (unsigned long) atomic_long_read(&priv->rx_packets);
	stats->rx_errors  = (unsigned long) 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 struct device_type l2tpeth_type = {
	.name = "l2tpeth",
};

static void l2tp_eth_dev_setup(struct net_device *dev)
{
	SET_NETDEV_DEVTYPE(dev, &l2tpeth_type);
	ether_setup(dev);
	dev->priv_flags		&= ~IFF_TX_SKB_SHARING;
	dev->features		|= NETIF_F_LLTX;
	dev->netdev_ops		= &l2tp_eth_netdev_ops;
	dev->needs_free_netdev	= true;
}

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 void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
				struct l2tp_session *session,
				struct net_device *dev)
{
	unsigned int overhead = 0;
	struct dst_entry *dst;
	u32 l3_overhead = 0;

	/* if the encap is UDP, account for UDP header size */
	if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {
		overhead += sizeof(struct udphdr);
		dev->needed_headroom += sizeof(struct udphdr);
	}
	if (session->mtu != 0) {
		dev->mtu = session->mtu;
		dev->needed_headroom += session->hdr_len;
		return;
	}
	lock_sock(tunnel->sock);
	l3_overhead = kernel_sock_ip_overhead(tunnel->sock);
	release_sock(tunnel->sock);
	if (l3_overhead == 0) {
		/* L3 Overhead couldn't be identified, this could be
		 * because tunnel->sock was NULL or the socket's
		 * address family was not IPv4 or IPv6,
		 * dev mtu stays at 1500.
		 */
		return;
	}
	/* Adjust MTU, factor overhead - underlay L3, overlay L2 hdr
	 * UDP overhead, if any, was already factored in above.
	 */
	overhead += session->hdr_len + ETH_HLEN + l3_overhead;

	/* If PMTU discovery was enabled, use discovered MTU on L2TP device */
	dst = sk_dst_get(tunnel->sock);
	if (dst) {
		/* dst_mtu will use PMTU if found, else fallback to intf MTU */
		u32 pmtu = dst_mtu(dst);

		if (pmtu != 0)
			dev->mtu = pmtu;
		dst_release(dst);
	}
	session->mtu = dev->mtu - overhead;
	dev->mtu = session->mtu;
	dev->needed_headroom += session->hdr_len;
}

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

	if (cfg->ifname) {
		strlcpy(name, cfg->ifname, IFNAMSIZ);
		name_assign_type = NET_NAME_USER;
	} else {
		strcpy(name, L2TP_ETH_DEV_NAME);
		name_assign_type = NET_NAME_ENUM;
	}

	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, name_assign_type,
			   l2tp_eth_dev_setup);
	if (!dev) {
		rc = -ENOMEM;
		goto out_del_session;
	}

	dev_net_set(dev, net);
	dev->min_mtu = 0;
	dev->max_mtu = ETH_MAX_MTU;
	l2tp_eth_adjust_mtu(tunnel, session, dev);

	priv = netdev_priv(dev);
	priv->dev = dev;
	priv->session = session;

	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);

	return 0;

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


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 err;

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

	return 0;

err:
	return err;
}

static void __exit l2tp_eth_exit(void)
{
	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");
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>
b784e7eb P	33	#include <linux/ip.h>
	34	#include <linux/ipv6.h>
	35	#include <linux/udp.h>
d9e31d17 JC	36
	37	#include "l2tp_core.h"
	38
	39	/* Default device name. May be overridden by name specified by user */
	40	#define L2TP_ETH_DEV_NAME "l2tpeth%d"
	41
	42	/* via netdev_priv() */
	43	struct l2tp_eth {
	44	struct net_device *dev;
	45	struct sock *tunnel_sock;
	46	struct l2tp_session *session;
a2842a1e ED	47	atomic_long_t tx_bytes;
a2842a1e ED	48	atomic_long_t tx_packets;
b8c84307	49	atomic_long_t tx_dropped;
a2842a1e ED	50	atomic_long_t rx_bytes;
	51	atomic_long_t rx_packets;
	52	atomic_long_t rx_errors;
d9e31d17 JC	53	};
	54
	55	/* via l2tp_session_priv() */
	56	struct l2tp_eth_sess {
	57	struct net_device *dev;
	58	};
	59
d9e31d17 JC	60
	61	static int l2tp_eth_dev_init(struct net_device *dev)
	62	{
	63	struct l2tp_eth *priv = netdev_priv(dev);
	64
	65	priv->dev = dev;
f2cedb63	66	eth_hw_addr_random(dev);
1cea7e2c	67	eth_broadcast_addr(dev->broadcast);
d3fff6c4	68	netdev_lockdep_set_classes(dev);
f9eb8aea	69
d9e31d17 JC	70	return 0;
	71	}
	72
	73	static void l2tp_eth_dev_uninit(struct net_device *dev)
	74	{
d9e31d17 JC	75	dev_put(dev);
	76	}
	77
	78	static int l2tp_eth_dev_xmit(struct sk_buff skb, struct net_device dev)
	79	{
	80	struct l2tp_eth *priv = netdev_priv(dev);
	81	struct l2tp_session *session = priv->session;
b8c84307 ED	82	unsigned int len = skb->len;
	83	int ret = l2tp_xmit_skb(session, skb, session->hdr_len);
	84
a4cd0271	85	if (likely(ret == NET_XMIT_SUCCESS)) {
b8c84307 ED	86	atomic_long_add(len, &priv->tx_bytes);
	87	atomic_long_inc(&priv->tx_packets);
	88	} else {
	89	atomic_long_inc(&priv->tx_dropped);
	90	}
aa214de0	91	return NETDEV_TX_OK;
d9e31d17 JC	92	}
d9e31d17 JC	93
bc1f4470	94	static void l2tp_eth_get_stats64(struct net_device *dev,
bc1f4470	95	struct rtnl_link_stats64 *stats)
a2842a1e ED	96	{
	97	struct l2tp_eth *priv = netdev_priv(dev);
	98
9b3dc0a1 DH	99	stats->tx_bytes = (unsigned long) atomic_long_read(&priv->tx_bytes);
	100	stats->tx_packets = (unsigned long) atomic_long_read(&priv->tx_packets);
	101	stats->tx_dropped = (unsigned long) atomic_long_read(&priv->tx_dropped);
	102	stats->rx_bytes = (unsigned long) atomic_long_read(&priv->rx_bytes);
	103	stats->rx_packets = (unsigned long) atomic_long_read(&priv->rx_packets);
	104	stats->rx_errors = (unsigned long) atomic_long_read(&priv->rx_errors);
	105
a2842a1e ED	106	}
a2842a1e ED	107
eb94737d	108	static const struct net_device_ops l2tp_eth_netdev_ops = {
d9e31d17 JC	109	.ndo_init = l2tp_eth_dev_init,
	110	.ndo_uninit = l2tp_eth_dev_uninit,
	111	.ndo_start_xmit = l2tp_eth_dev_xmit,
a2842a1e	112	.ndo_get_stats64 = l2tp_eth_get_stats64,
fe159122	113	.ndo_set_mac_address = eth_mac_addr,
d9e31d17 JC	114	};
d9e31d17 JC	115
a485c2b8 GN	116	static struct device_type l2tpeth_type = {
	117	.name = "l2tpeth",
	118	};
	119
d9e31d17 JC	120	static void l2tp_eth_dev_setup(struct net_device *dev)
d9e31d17 JC	121	{
a485c2b8	122	SET_NETDEV_DEVTYPE(dev, &l2tpeth_type);
d9e31d17	123	ether_setup(dev);
a2842a1e ED	124	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
a2842a1e ED	125	dev->features \|= NETIF_F_LLTX;
d9e31d17	126	dev->netdev_ops = &l2tp_eth_netdev_ops;
cf124db5	127	dev->needs_free_netdev = true;
d9e31d17 JC	128	}
	129
	130	static void l2tp_eth_dev_recv(struct l2tp_session session, struct sk_buff skb, int data_len)
	131	{
	132	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	133	struct net_device *dev = spriv->dev;
a2842a1e	134	struct l2tp_eth *priv = netdev_priv(dev);
d9e31d17 JC	135
	136	if (session->debug & L2TP_MSG_DATA) {
	137	unsigned int length;
d9e31d17 JC	138
	139	length = min(32u, skb->len);
	140	if (!pskb_may_pull(skb, length))
	141	goto error;
	142
a4ca44fa	143	pr_debug("%s: eth recv\n", session->name);
a2842a1e	144	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
d9e31d17 JC	145	}
d9e31d17 JC	146
c0cc88a7	147	if (!pskb_may_pull(skb, ETH_HLEN))
d9e31d17 JC	148	goto error;
	149
	150	secpath_reset(skb);
	151
	152	/* checksums verified by L2TP */
	153	skb->ip_summed = CHECKSUM_NONE;
	154
	155	skb_dst_drop(skb);
	156	nf_reset(skb);
	157
	158	if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
a2842a1e ED	159	atomic_long_inc(&priv->rx_packets);
	160	atomic_long_add(data_len, &priv->rx_bytes);
	161	} else {
	162	atomic_long_inc(&priv->rx_errors);
	163	}
d9e31d17 JC	164	return;
	165
	166	error:
a2842a1e	167	atomic_long_inc(&priv->rx_errors);
d9e31d17 JC	168	kfree_skb(skb);
	169	}
	170
	171	static void l2tp_eth_delete(struct l2tp_session *session)
	172	{
	173	struct l2tp_eth_sess *spriv;
	174	struct net_device *dev;
	175
	176	if (session) {
	177	spriv = l2tp_session_priv(session);
	178	dev = spriv->dev;
	179	if (dev) {
	180	unregister_netdev(dev);
	181	spriv->dev = NULL;
a06998b8	182	module_put(THIS_MODULE);
d9e31d17 JC	183	}
	184	}
	185	}
	186
9dd79945	187	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	188	static void l2tp_eth_show(struct seq_file m, void arg)
	189	{
	190	struct l2tp_session *session = arg;
	191	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	192	struct net_device *dev = spriv->dev;
	193
	194	seq_printf(m, " interface %s\n", dev->name);
	195	}
	196	#endif
	197
b784e7eb P	198	static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
	199	struct l2tp_session *session,
	200	struct net_device *dev)
	201	{
	202	unsigned int overhead = 0;
	203	struct dst_entry *dst;
	204	u32 l3_overhead = 0;
	205
	206	/* if the encap is UDP, account for UDP header size */
	207	if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {
	208	overhead += sizeof(struct udphdr);
	209	dev->needed_headroom += sizeof(struct udphdr);
	210	}
	211	if (session->mtu != 0) {
	212	dev->mtu = session->mtu;
	213	dev->needed_headroom += session->hdr_len;
	214	return;
	215	}
57240d00	216	lock_sock(tunnel->sock);
b784e7eb	217	l3_overhead = kernel_sock_ip_overhead(tunnel->sock);
57240d00	218	release_sock(tunnel->sock);
b784e7eb P	219	if (l3_overhead == 0) {
	220	/* L3 Overhead couldn't be identified, this could be
	221	* because tunnel->sock was NULL or the socket's
	222	* address family was not IPv4 or IPv6,
	223	* dev mtu stays at 1500.
	224	*/
	225	return;
	226	}
	227	/* Adjust MTU, factor overhead - underlay L3, overlay L2 hdr
	228	* UDP overhead, if any, was already factored in above.
	229	*/
	230	overhead += session->hdr_len + ETH_HLEN + l3_overhead;
	231
	232	/* If PMTU discovery was enabled, use discovered MTU on L2TP device */
	233	dst = sk_dst_get(tunnel->sock);
	234	if (dst) {
	235	/* dst_mtu will use PMTU if found, else fallback to intf MTU */
	236	u32 pmtu = dst_mtu(dst);
	237
	238	if (pmtu != 0)
	239	dev->mtu = pmtu;
	240	dst_release(dst);
	241	}
	242	session->mtu = dev->mtu - overhead;
	243	dev->mtu = session->mtu;
	244	dev->needed_headroom += session->hdr_len;
	245	}
	246
f026bc29 GN	247	static int l2tp_eth_create(struct net net, struct l2tp_tunnel tunnel,
	248	u32 session_id, u32 peer_session_id,
	249	struct l2tp_session_cfg *cfg)
d9e31d17	250	{
c39855fe	251	unsigned char name_assign_type;
d9e31d17 JC	252	struct net_device *dev;
d9e31d17 JC	253	char name[IFNAMSIZ];
d9e31d17 JC	254	struct l2tp_session *session;
	255	struct l2tp_eth *priv;
	256	struct l2tp_eth_sess *spriv;
	257	int rc;
d9e31d17	258
d9e31d17	259	if (cfg->ifname) {
d9e31d17	260	strlcpy(name, cfg->ifname, IFNAMSIZ);
c39855fe GN	261	name_assign_type = NET_NAME_USER;
c39855fe GN	262	} else {
d9e31d17	263	strcpy(name, L2TP_ETH_DEV_NAME);
c39855fe GN	264	name_assign_type = NET_NAME_ENUM;
c39855fe GN	265	}
d9e31d17 JC	266
	267	session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
	268	peer_session_id, cfg);
dbdbc73b GN	269	if (IS_ERR(session)) {
dbdbc73b GN	270	rc = PTR_ERR(session);
d9e31d17 JC	271	goto out;
	272	}
	273
c39855fe	274	dev = alloc_netdev(sizeof(*priv), name, name_assign_type,
c835a677	275	l2tp_eth_dev_setup);
d9e31d17 JC	276	if (!dev) {
	277	rc = -ENOMEM;
	278	goto out_del_session;
	279	}
	280
	281	dev_net_set(dev, net);
8b1efc0f JW	282	dev->min_mtu = 0;
8b1efc0f JW	283	dev->max_mtu = ETH_MAX_MTU;
b784e7eb	284	l2tp_eth_adjust_mtu(tunnel, session, dev);
d9e31d17 JC	285
	286	priv = netdev_priv(dev);
	287	priv->dev = dev;
	288	priv->session = session;
d9e31d17 JC	289
	290	priv->tunnel_sock = tunnel->sock;
	291	session->recv_skb = l2tp_eth_dev_recv;
	292	session->session_close = l2tp_eth_delete;
9dd79945	293	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	294	session->show = l2tp_eth_show;
0ad66140 JC	295	#endif
d9e31d17 JC	296
	297	spriv = l2tp_session_priv(session);
	298	spriv->dev = dev;
	299
	300	rc = register_netdev(dev);
	301	if (rc < 0)
	302	goto out_del_dev;
	303
a06998b8	304	__module_get(THIS_MODULE);
d9e31d17 JC	305	/* Must be done after register_netdev() */
	306	strlcpy(session->ifname, dev->name, IFNAMSIZ);
	307
	308	dev_hold(dev);
d9e31d17 JC	309
	310	return 0;
	311
	312	out_del_dev:
	313	free_netdev(dev);
78933636	314	spriv->dev = NULL;
d9e31d17 JC	315	out_del_session:
	316	l2tp_session_delete(session);
	317	out:
	318	return rc;
	319	}
	320
d9e31d17 JC	321
	322	static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
	323	.session_create = l2tp_eth_create,
	324	.session_delete = l2tp_session_delete,
	325	};
	326
	327
	328	static int __init l2tp_eth_init(void)
	329	{
	330	int err = 0;
	331
	332	err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
	333	if (err)
9f775ead	334	goto err;
d9e31d17	335
a4ca44fa	336	pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
d9e31d17 JC	337
	338	return 0;
	339
9f775ead	340	err:
d9e31d17 JC	341	return err;
	342	}
	343
	344	static void __exit l2tp_eth_exit(void)
	345	{
d9e31d17 JC	346	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	347	}
	348
	349	module_init(l2tp_eth_init);
	350	module_exit(l2tp_eth_exit);
	351
	352	MODULE_LICENSE("GPL");
	353	MODULE_AUTHOR("James Chapman <[email protected]>");
	354	MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
	355	MODULE_VERSION("1.0");
f1f39f91	356	MODULE_ALIAS_L2TP_PWTYPE(5);