[mirror_ubuntu-artful-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 <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   = (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, 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
9b3dc0a1 DH	117	stats->tx_bytes = (unsigned long) atomic_long_read(&priv->tx_bytes);
	118	stats->tx_packets = (unsigned long) atomic_long_read(&priv->tx_packets);
	119	stats->tx_dropped = (unsigned long) atomic_long_read(&priv->tx_dropped);
	120	stats->rx_bytes = (unsigned long) atomic_long_read(&priv->rx_bytes);
	121	stats->rx_packets = (unsigned long) atomic_long_read(&priv->rx_packets);
	122	stats->rx_errors = (unsigned long) atomic_long_read(&priv->rx_errors);
	123
a2842a1e ED	124	}
a2842a1e ED	125
eb94737d	126	static const struct net_device_ops l2tp_eth_netdev_ops = {
d9e31d17 JC	127	.ndo_init = l2tp_eth_dev_init,
	128	.ndo_uninit = l2tp_eth_dev_uninit,
	129	.ndo_start_xmit = l2tp_eth_dev_xmit,
a2842a1e	130	.ndo_get_stats64 = l2tp_eth_get_stats64,
fe159122	131	.ndo_set_mac_address = eth_mac_addr,
d9e31d17 JC	132	};
d9e31d17 JC	133
a485c2b8 GN	134	static struct device_type l2tpeth_type = {
	135	.name = "l2tpeth",
	136	};
	137
d9e31d17 JC	138	static void l2tp_eth_dev_setup(struct net_device *dev)
d9e31d17 JC	139	{
a485c2b8	140	SET_NETDEV_DEVTYPE(dev, &l2tpeth_type);
d9e31d17	141	ether_setup(dev);
a2842a1e ED	142	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
a2842a1e ED	143	dev->features \|= NETIF_F_LLTX;
d9e31d17	144	dev->netdev_ops = &l2tp_eth_netdev_ops;
cf124db5	145	dev->needs_free_netdev = true;
d9e31d17 JC	146	}
	147
	148	static void l2tp_eth_dev_recv(struct l2tp_session session, struct sk_buff skb, int data_len)
	149	{
	150	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	151	struct net_device *dev = spriv->dev;
a2842a1e	152	struct l2tp_eth *priv = netdev_priv(dev);
d9e31d17 JC	153
	154	if (session->debug & L2TP_MSG_DATA) {
	155	unsigned int length;
d9e31d17 JC	156
	157	length = min(32u, skb->len);
	158	if (!pskb_may_pull(skb, length))
	159	goto error;
	160
a4ca44fa	161	pr_debug("%s: eth recv\n", session->name);
a2842a1e	162	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
d9e31d17 JC	163	}
d9e31d17 JC	164
c0cc88a7	165	if (!pskb_may_pull(skb, ETH_HLEN))
d9e31d17 JC	166	goto error;
	167
	168	secpath_reset(skb);
	169
	170	/* checksums verified by L2TP */
	171	skb->ip_summed = CHECKSUM_NONE;
	172
	173	skb_dst_drop(skb);
	174	nf_reset(skb);
	175
	176	if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
a2842a1e ED	177	atomic_long_inc(&priv->rx_packets);
	178	atomic_long_add(data_len, &priv->rx_bytes);
	179	} else {
	180	atomic_long_inc(&priv->rx_errors);
	181	}
d9e31d17 JC	182	return;
	183
	184	error:
a2842a1e	185	atomic_long_inc(&priv->rx_errors);
d9e31d17 JC	186	kfree_skb(skb);
	187	}
	188
	189	static void l2tp_eth_delete(struct l2tp_session *session)
	190	{
	191	struct l2tp_eth_sess *spriv;
	192	struct net_device *dev;
	193
	194	if (session) {
	195	spriv = l2tp_session_priv(session);
	196	dev = spriv->dev;
	197	if (dev) {
	198	unregister_netdev(dev);
	199	spriv->dev = NULL;
a06998b8	200	module_put(THIS_MODULE);
d9e31d17 JC	201	}
	202	}
	203	}
	204
9dd79945	205	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	206	static void l2tp_eth_show(struct seq_file m, void arg)
	207	{
	208	struct l2tp_session *session = arg;
	209	struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
	210	struct net_device *dev = spriv->dev;
	211
	212	seq_printf(m, " interface %s\n", dev->name);
	213	}
	214	#endif
	215
b784e7eb P	216	static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
	217	struct l2tp_session *session,
	218	struct net_device *dev)
	219	{
	220	unsigned int overhead = 0;
	221	struct dst_entry *dst;
	222	u32 l3_overhead = 0;
	223
	224	/* if the encap is UDP, account for UDP header size */
	225	if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {
	226	overhead += sizeof(struct udphdr);
	227	dev->needed_headroom += sizeof(struct udphdr);
	228	}
	229	if (session->mtu != 0) {
	230	dev->mtu = session->mtu;
	231	dev->needed_headroom += session->hdr_len;
	232	return;
	233	}
57240d00	234	lock_sock(tunnel->sock);
b784e7eb	235	l3_overhead = kernel_sock_ip_overhead(tunnel->sock);
57240d00	236	release_sock(tunnel->sock);
b784e7eb P	237	if (l3_overhead == 0) {
	238	/* L3 Overhead couldn't be identified, this could be
	239	* because tunnel->sock was NULL or the socket's
	240	* address family was not IPv4 or IPv6,
	241	* dev mtu stays at 1500.
	242	*/
	243	return;
	244	}
	245	/* Adjust MTU, factor overhead - underlay L3, overlay L2 hdr
	246	* UDP overhead, if any, was already factored in above.
	247	*/
	248	overhead += session->hdr_len + ETH_HLEN + l3_overhead;
	249
	250	/* If PMTU discovery was enabled, use discovered MTU on L2TP device */
	251	dst = sk_dst_get(tunnel->sock);
	252	if (dst) {
	253	/* dst_mtu will use PMTU if found, else fallback to intf MTU */
	254	u32 pmtu = dst_mtu(dst);
	255
	256	if (pmtu != 0)
	257	dev->mtu = pmtu;
	258	dst_release(dst);
	259	}
	260	session->mtu = dev->mtu - overhead;
	261	dev->mtu = session->mtu;
	262	dev->needed_headroom += session->hdr_len;
	263	}
	264
d9e31d17 JC	265	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	266	{
c39855fe	267	unsigned char name_assign_type;
d9e31d17 JC	268	struct net_device *dev;
	269	char name[IFNAMSIZ];
	270	struct l2tp_tunnel *tunnel;
	271	struct l2tp_session *session;
	272	struct l2tp_eth *priv;
	273	struct l2tp_eth_sess *spriv;
	274	int rc;
	275	struct l2tp_eth_net *pn;
	276
	277	tunnel = l2tp_tunnel_find(net, tunnel_id);
	278	if (!tunnel) {
	279	rc = -ENODEV;
	280	goto out;
	281	}
	282
d9e31d17	283	if (cfg->ifname) {
d9e31d17	284	strlcpy(name, cfg->ifname, IFNAMSIZ);
c39855fe GN	285	name_assign_type = NET_NAME_USER;
c39855fe GN	286	} else {
d9e31d17	287	strcpy(name, L2TP_ETH_DEV_NAME);
c39855fe GN	288	name_assign_type = NET_NAME_ENUM;
c39855fe GN	289	}
d9e31d17 JC	290
	291	session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
	292	peer_session_id, cfg);
dbdbc73b GN	293	if (IS_ERR(session)) {
dbdbc73b GN	294	rc = PTR_ERR(session);
d9e31d17 JC	295	goto out;
	296	}
	297
c39855fe	298	dev = alloc_netdev(sizeof(*priv), name, name_assign_type,
c835a677	299	l2tp_eth_dev_setup);
d9e31d17 JC	300	if (!dev) {
	301	rc = -ENOMEM;
	302	goto out_del_session;
	303	}
	304
	305	dev_net_set(dev, net);
8b1efc0f JW	306	dev->min_mtu = 0;
8b1efc0f JW	307	dev->max_mtu = ETH_MAX_MTU;
b784e7eb	308	l2tp_eth_adjust_mtu(tunnel, session, dev);
d9e31d17 JC	309
	310	priv = netdev_priv(dev);
	311	priv->dev = dev;
	312	priv->session = session;
	313	INIT_LIST_HEAD(&priv->list);
	314
	315	priv->tunnel_sock = tunnel->sock;
	316	session->recv_skb = l2tp_eth_dev_recv;
	317	session->session_close = l2tp_eth_delete;
9dd79945	318	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	319	session->show = l2tp_eth_show;
0ad66140 JC	320	#endif
d9e31d17 JC	321
	322	spriv = l2tp_session_priv(session);
	323	spriv->dev = dev;
	324
	325	rc = register_netdev(dev);
	326	if (rc < 0)
	327	goto out_del_dev;
	328
a06998b8	329	__module_get(THIS_MODULE);
d9e31d17 JC	330	/* Must be done after register_netdev() */
	331	strlcpy(session->ifname, dev->name, IFNAMSIZ);
	332
	333	dev_hold(dev);
	334	pn = l2tp_eth_pernet(dev_net(dev));
	335	spin_lock(&pn->l2tp_eth_lock);
	336	list_add(&priv->list, &pn->l2tp_eth_dev_list);
	337	spin_unlock(&pn->l2tp_eth_lock);
	338
	339	return 0;
	340
	341	out_del_dev:
	342	free_netdev(dev);
78933636	343	spriv->dev = NULL;
d9e31d17 JC	344	out_del_session:
	345	l2tp_session_delete(session);
	346	out:
	347	return rc;
	348	}
	349
	350	static __net_init int l2tp_eth_init_net(struct net *net)
	351	{
3a737028	352	struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
d9e31d17 JC	353
	354	INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
	355	spin_lock_init(&pn->l2tp_eth_lock);
	356
d9e31d17	357	return 0;
d9e31d17 JC	358	}
d9e31d17 JC	359
8aa525a9	360	static struct pernet_operations l2tp_eth_net_ops = {
d9e31d17	361	.init = l2tp_eth_init_net,
d9e31d17 JC	362	.id = &l2tp_eth_net_id,
	363	.size = sizeof(struct l2tp_eth_net),
	364	};
	365
	366
	367	static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
	368	.session_create = l2tp_eth_create,
	369	.session_delete = l2tp_session_delete,
	370	};
	371
	372
	373	static int __init l2tp_eth_init(void)
	374	{
	375	int err = 0;
	376
	377	err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
	378	if (err)
	379	goto out;
	380
	381	err = register_pernet_device(&l2tp_eth_net_ops);
	382	if (err)
	383	goto out_unreg;
	384
a4ca44fa	385	pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
d9e31d17 JC	386
	387	return 0;
	388
	389	out_unreg:
	390	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	391	out:
	392	return err;
	393	}
	394
	395	static void __exit l2tp_eth_exit(void)
	396	{
	397	unregister_pernet_device(&l2tp_eth_net_ops);
	398	l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
	399	}
	400
	401	module_init(l2tp_eth_init);
	402	module_exit(l2tp_eth_exit);
	403
	404	MODULE_LICENSE("GPL");
	405	MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
	406	MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
	407	MODULE_VERSION("1.0");
f1f39f91	408	MODULE_ALIAS_L2TP_PWTYPE(5);