[linux-block.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;
	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 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->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 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, u32 tunnel_id, 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_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) {
		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;
	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>
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;
	47	struct list_head list;
a2842a1e ED	48	atomic_long_t tx_bytes;
a2842a1e ED	49	atomic_long_t tx_packets;
b8c84307	50	atomic_long_t tx_dropped;
a2842a1e ED	51	atomic_long_t rx_bytes;
	52	atomic_long_t rx_packets;
	53	atomic_long_t rx_errors;
d9e31d17 JC	54	};
	55
	56	/* via l2tp_session_priv() */
	57	struct l2tp_eth_sess {
	58	struct net_device *dev;
	59	};
	60
	61	/* per-net private data for this module */
	62	static unsigned int l2tp_eth_net_id;
	63	struct l2tp_eth_net {
	64	struct list_head l2tp_eth_dev_list;
	65	spinlock_t l2tp_eth_lock;
	66	};
	67
	68	static inline struct l2tp_eth_net l2tp_eth_pernet(struct net net)
	69	{
	70	return net_generic(net, l2tp_eth_net_id);
	71	}
	72
	73	static int l2tp_eth_dev_init(struct net_device *dev)
	74	{
	75	struct l2tp_eth *priv = netdev_priv(dev);
	76
	77	priv->dev = dev;
f2cedb63	78	eth_hw_addr_random(dev);
1cea7e2c	79	eth_broadcast_addr(dev->broadcast);
d3fff6c4	80	netdev_lockdep_set_classes(dev);
f9eb8aea	81
d9e31d17 JC	82	return 0;
	83	}
	84
	85	static void l2tp_eth_dev_uninit(struct net_device *dev)
	86	{
	87	struct l2tp_eth *priv = netdev_priv(dev);
	88	struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
	89
	90	spin_lock(&pn->l2tp_eth_lock);
	91	list_del_init(&priv->list);
	92	spin_unlock(&pn->l2tp_eth_lock);
	93	dev_put(dev);
	94	}
	95
	96	static int l2tp_eth_dev_xmit(struct sk_buff skb, struct net_device dev)
	97	{
	98	struct l2tp_eth *priv = netdev_priv(dev);
	99	struct l2tp_session *session = priv->session;
b8c84307 ED	100	unsigned int len = skb->len;
	101	int ret = l2tp_xmit_skb(session, skb, session->hdr_len);
	102
a4cd0271	103	if (likely(ret == NET_XMIT_SUCCESS)) {
b8c84307 ED	104	atomic_long_add(len, &priv->tx_bytes);
	105	atomic_long_inc(&priv->tx_packets);
	106	} else {
	107	atomic_long_inc(&priv->tx_dropped);
	108	}
aa214de0	109	return NETDEV_TX_OK;
d9e31d17 JC	110	}
d9e31d17 JC	111
bc1f4470	112	static void l2tp_eth_get_stats64(struct net_device *dev,
bc1f4470	113	struct rtnl_link_stats64 *stats)
a2842a1e ED	114	{
	115	struct l2tp_eth *priv = netdev_priv(dev);
	116
	117	stats->tx_bytes = atomic_long_read(&priv->tx_bytes);
	118	stats->tx_packets = atomic_long_read(&priv->tx_packets);
b8c84307	119	stats->tx_dropped = atomic_long_read(&priv->tx_dropped);
a2842a1e ED	120	stats->rx_bytes = atomic_long_read(&priv->rx_bytes);
	121	stats->rx_packets = atomic_long_read(&priv->rx_packets);
	122	stats->rx_errors = atomic_long_read(&priv->rx_errors);
a2842a1e ED	123	}
a2842a1e ED	124
eb94737d	125	static const struct net_device_ops l2tp_eth_netdev_ops = {
d9e31d17 JC	126	.ndo_init = l2tp_eth_dev_init,
	127	.ndo_uninit = l2tp_eth_dev_uninit,
	128	.ndo_start_xmit = l2tp_eth_dev_xmit,
a2842a1e	129	.ndo_get_stats64 = l2tp_eth_get_stats64,
fe159122	130	.ndo_set_mac_address = eth_mac_addr,
d9e31d17 JC	131	};
d9e31d17 JC	132
a485c2b8 GN	133	static struct device_type l2tpeth_type = {
	134	.name = "l2tpeth",
	135	};
	136
d9e31d17 JC	137	static void l2tp_eth_dev_setup(struct net_device *dev)
d9e31d17 JC	138	{
a485c2b8	139	SET_NETDEV_DEVTYPE(dev, &l2tpeth_type);
d9e31d17	140	ether_setup(dev);
a2842a1e ED	141	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
a2842a1e ED	142	dev->features \|= NETIF_F_LLTX;
d9e31d17 JC	143	dev->netdev_ops = &l2tp_eth_netdev_ops;
	144	dev->destructor = free_netdev;
	145	}
	146
	147	static void l2tp_eth_dev_recv(struct l2tp_session session, struct sk_buff skb, int data_len)
	148	{
	149	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	150	struct net_device *dev = spriv->dev;
a2842a1e	151	struct l2tp_eth *priv = netdev_priv(dev);
d9e31d17 JC	152
	153	if (session->debug & L2TP_MSG_DATA) {
	154	unsigned int length;
d9e31d17 JC	155
	156	length = min(32u, skb->len);
	157	if (!pskb_may_pull(skb, length))
	158	goto error;
	159
a4ca44fa	160	pr_debug("%s: eth recv\n", session->name);
a2842a1e	161	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
d9e31d17 JC	162	}
d9e31d17 JC	163
c0cc88a7	164	if (!pskb_may_pull(skb, ETH_HLEN))
d9e31d17 JC	165	goto error;
	166
	167	secpath_reset(skb);
	168
	169	/* checksums verified by L2TP */
	170	skb->ip_summed = CHECKSUM_NONE;
	171
	172	skb_dst_drop(skb);
	173	nf_reset(skb);
	174
	175	if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
a2842a1e ED	176	atomic_long_inc(&priv->rx_packets);
	177	atomic_long_add(data_len, &priv->rx_bytes);
	178	} else {
	179	atomic_long_inc(&priv->rx_errors);
	180	}
d9e31d17 JC	181	return;
	182
	183	error:
a2842a1e	184	atomic_long_inc(&priv->rx_errors);
d9e31d17 JC	185	kfree_skb(skb);
	186	}
	187
	188	static void l2tp_eth_delete(struct l2tp_session *session)
	189	{
	190	struct l2tp_eth_sess *spriv;
	191	struct net_device *dev;
	192
	193	if (session) {
	194	spriv = l2tp_session_priv(session);
	195	dev = spriv->dev;
	196	if (dev) {
	197	unregister_netdev(dev);
	198	spriv->dev = NULL;
a06998b8	199	module_put(THIS_MODULE);
d9e31d17 JC	200	}
	201	}
	202	}
	203
9dd79945	204	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	205	static void l2tp_eth_show(struct seq_file m, void arg)
	206	{
	207	struct l2tp_session *session = arg;
	208	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	209	struct net_device *dev = spriv->dev;
	210
	211	seq_printf(m, " interface %s\n", dev->name);
	212	}
	213	#endif
	214
b784e7eb P	215	static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
	216	struct l2tp_session *session,
	217	struct net_device *dev)
	218	{
	219	unsigned int overhead = 0;
	220	struct dst_entry *dst;
	221	u32 l3_overhead = 0;
	222
	223	/* if the encap is UDP, account for UDP header size */
	224	if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {
	225	overhead += sizeof(struct udphdr);
	226	dev->needed_headroom += sizeof(struct udphdr);
	227	}
	228	if (session->mtu != 0) {
	229	dev->mtu = session->mtu;
	230	dev->needed_headroom += session->hdr_len;
	231	return;
	232	}
57240d00	233	lock_sock(tunnel->sock);
b784e7eb	234	l3_overhead = kernel_sock_ip_overhead(tunnel->sock);
57240d00	235	release_sock(tunnel->sock);
b784e7eb P	236	if (l3_overhead == 0) {
	237	/* L3 Overhead couldn't be identified, this could be
	238	* because tunnel->sock was NULL or the socket's
	239	* address family was not IPv4 or IPv6,
	240	* dev mtu stays at 1500.
	241	*/
	242	return;
	243	}
	244	/* Adjust MTU, factor overhead - underlay L3, overlay L2 hdr
	245	* UDP overhead, if any, was already factored in above.
	246	*/
	247	overhead += session->hdr_len + ETH_HLEN + l3_overhead;
	248
	249	/* If PMTU discovery was enabled, use discovered MTU on L2TP device */
	250	dst = sk_dst_get(tunnel->sock);
	251	if (dst) {
	252	/* dst_mtu will use PMTU if found, else fallback to intf MTU */
	253	u32 pmtu = dst_mtu(dst);
	254
	255	if (pmtu != 0)
	256	dev->mtu = pmtu;
	257	dst_release(dst);
	258	}
	259	session->mtu = dev->mtu - overhead;
	260	dev->mtu = session->mtu;
	261	dev->needed_headroom += session->hdr_len;
	262	}
	263
d9e31d17 JC	264	static int l2tp_eth_create(struct net net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg cfg)
d9e31d17 JC	265	{
c39855fe	266	unsigned char name_assign_type;
d9e31d17 JC	267	struct net_device *dev;
	268	char name[IFNAMSIZ];
	269	struct l2tp_tunnel *tunnel;
	270	struct l2tp_session *session;
	271	struct l2tp_eth *priv;
	272	struct l2tp_eth_sess *spriv;
	273	int rc;
	274	struct l2tp_eth_net *pn;
	275
	276	tunnel = l2tp_tunnel_find(net, tunnel_id);
	277	if (!tunnel) {
	278	rc = -ENODEV;
	279	goto out;
	280	}
	281
d9e31d17	282	if (cfg->ifname) {
d9e31d17	283	strlcpy(name, cfg->ifname, IFNAMSIZ);
c39855fe GN	284	name_assign_type = NET_NAME_USER;
c39855fe GN	285	} else {
d9e31d17	286	strcpy(name, L2TP_ETH_DEV_NAME);
c39855fe GN	287	name_assign_type = NET_NAME_ENUM;
c39855fe GN	288	}
d9e31d17 JC	289
	290	session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
	291	peer_session_id, cfg);
dbdbc73b GN	292	if (IS_ERR(session)) {
dbdbc73b GN	293	rc = PTR_ERR(session);
d9e31d17 JC	294	goto out;
	295	}
	296
c39855fe	297	dev = alloc_netdev(sizeof(*priv), name, name_assign_type,
c835a677	298	l2tp_eth_dev_setup);
d9e31d17 JC	299	if (!dev) {
	300	rc = -ENOMEM;
	301	goto out_del_session;
	302	}
	303
	304	dev_net_set(dev, net);
8b1efc0f JW	305	dev->min_mtu = 0;
8b1efc0f JW	306	dev->max_mtu = ETH_MAX_MTU;
b784e7eb	307	l2tp_eth_adjust_mtu(tunnel, session, dev);
d9e31d17 JC	308
	309	priv = netdev_priv(dev);
	310	priv->dev = dev;
	311	priv->session = session;
	312	INIT_LIST_HEAD(&priv->list);
	313
	314	priv->tunnel_sock = tunnel->sock;
	315	session->recv_skb = l2tp_eth_dev_recv;
	316	session->session_close = l2tp_eth_delete;
9dd79945	317	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	318	session->show = l2tp_eth_show;
0ad66140 JC	319	#endif
d9e31d17 JC	320
	321	spriv = l2tp_session_priv(session);
	322	spriv->dev = dev;
	323
	324	rc = register_netdev(dev);
	325	if (rc < 0)
	326	goto out_del_dev;
	327
a06998b8	328	__module_get(THIS_MODULE);
d9e31d17 JC	329	/* Must be done after register_netdev() */
	330	strlcpy(session->ifname, dev->name, IFNAMSIZ);
	331
	332	dev_hold(dev);
	333	pn = l2tp_eth_pernet(dev_net(dev));
	334	spin_lock(&pn->l2tp_eth_lock);
	335	list_add(&priv->list, &pn->l2tp_eth_dev_list);
	336	spin_unlock(&pn->l2tp_eth_lock);
	337
	338	return 0;
	339
	340	out_del_dev:
	341	free_netdev(dev);
78933636	342	spriv->dev = NULL;
d9e31d17 JC	343	out_del_session:
	344	l2tp_session_delete(session);
	345	out:
	346	return rc;
	347	}
	348
	349	static __net_init int l2tp_eth_init_net(struct net *net)
	350	{
3a737028	351	struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
d9e31d17 JC	352
	353	INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
	354	spin_lock_init(&pn->l2tp_eth_lock);
	355
d9e31d17	356	return 0;
d9e31d17 JC	357	}
d9e31d17 JC	358
8aa525a9	359	static struct pernet_operations l2tp_eth_net_ops = {
d9e31d17	360	.init = l2tp_eth_init_net,
d9e31d17 JC	361	.id = &l2tp_eth_net_id,
	362	.size = sizeof(struct l2tp_eth_net),
	363	};
	364
	365
	366	static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
	367	.session_create = l2tp_eth_create,
	368	.session_delete = l2tp_session_delete,
	369	};
	370
	371
	372	static int __init l2tp_eth_init(void)
	373	{
	374	int err = 0;
	375
	376	err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
	377	if (err)
	378	goto out;
	379
	380	err = register_pernet_device(&l2tp_eth_net_ops);
	381	if (err)
	382	goto out_unreg;
	383
a4ca44fa	384	pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
d9e31d17 JC	385
	386	return 0;
	387
	388	out_unreg:
	389	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	390	out:
	391	return err;
	392	}
	393
	394	static void __exit l2tp_eth_exit(void)
	395	{
	396	unregister_pernet_device(&l2tp_eth_net_ops);
	397	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	398	}
	399
	400	module_init(l2tp_eth_init);
	401	module_exit(l2tp_eth_exit);
	402
	403	MODULE_LICENSE("GPL");
	404	MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
	405	MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
	406	MODULE_VERSION("1.0");
f1f39f91	407	MODULE_ALIAS_L2TP_PWTYPE(5);