[linux-block.git] / drivers / net / veth.c

/*
 *  drivers/net/veth.c
 *
 *  Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
 *
 * Author: Pavel Emelianov <xemul@openvz.org>
 * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
 *
 */

#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>

#include <net/dst.h>
#include <net/xfrm.h>
#include <linux/veth.h>

#define DRV_NAME	"veth"
#define DRV_VERSION	"1.0"

struct veth_net_stats {
	unsigned long	rx_packets;
	unsigned long	tx_packets;
	unsigned long	rx_bytes;
	unsigned long	tx_bytes;
	unsigned long	tx_dropped;
};

struct veth_priv {
	struct net_device *peer;
	struct veth_net_stats *stats;
	unsigned ip_summed;
};

/*
 * ethtool interface
 */

static struct {
	const char string[ETH_GSTRING_LEN];
} ethtool_stats_keys[] = {
	{ "peer_ifindex" },
};

static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	cmd->supported		= 0;
	cmd->advertising	= 0;
	cmd->speed		= SPEED_10000;
	cmd->duplex		= DUPLEX_FULL;
	cmd->port		= PORT_TP;
	cmd->phy_address	= 0;
	cmd->transceiver	= XCVR_INTERNAL;
	cmd->autoneg		= AUTONEG_DISABLE;
	cmd->maxtxpkt		= 0;
	cmd->maxrxpkt		= 0;
	return 0;
}

static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strcpy(info->driver, DRV_NAME);
	strcpy(info->version, DRV_VERSION);
	strcpy(info->fw_version, "N/A");
}

static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
{
	switch(stringset) {
	case ETH_SS_STATS:
		memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
		break;
	}
}

static int veth_get_sset_count(struct net_device *dev, int sset)
{
	switch (sset) {
	case ETH_SS_STATS:
		return ARRAY_SIZE(ethtool_stats_keys);
	default:
		return -EOPNOTSUPP;
	}
}

static void veth_get_ethtool_stats(struct net_device *dev,
		struct ethtool_stats *stats, u64 *data)
{
	struct veth_priv *priv;

	priv = netdev_priv(dev);
	data[0] = priv->peer->ifindex;
}

static u32 veth_get_rx_csum(struct net_device *dev)
{
	struct veth_priv *priv;

	priv = netdev_priv(dev);
	return priv->ip_summed == CHECKSUM_UNNECESSARY;
}

static int veth_set_rx_csum(struct net_device *dev, u32 data)
{
	struct veth_priv *priv;

	priv = netdev_priv(dev);
	priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
	return 0;
}

static u32 veth_get_tx_csum(struct net_device *dev)
{
	return (dev->features & NETIF_F_NO_CSUM) != 0;
}

static int veth_set_tx_csum(struct net_device *dev, u32 data)
{
	if (data)
		dev->features |= NETIF_F_NO_CSUM;
	else
		dev->features &= ~NETIF_F_NO_CSUM;
	return 0;
}

static struct ethtool_ops veth_ethtool_ops = {
	.get_settings		= veth_get_settings,
	.get_drvinfo		= veth_get_drvinfo,
	.get_link		= ethtool_op_get_link,
	.get_rx_csum		= veth_get_rx_csum,
	.set_rx_csum		= veth_set_rx_csum,
	.get_tx_csum		= veth_get_tx_csum,
	.set_tx_csum		= veth_set_tx_csum,
	.get_sg			= ethtool_op_get_sg,
	.set_sg			= ethtool_op_set_sg,
	.get_strings		= veth_get_strings,
	.get_sset_count		= veth_get_sset_count,
	.get_ethtool_stats	= veth_get_ethtool_stats,
};

/*
 * xmit
 */

static int veth_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct net_device *rcv = NULL;
	struct veth_priv *priv, *rcv_priv;
	struct veth_net_stats *stats;
	int length, cpu;

	skb_orphan(skb);

	priv = netdev_priv(dev);
	rcv = priv->peer;
	rcv_priv = netdev_priv(rcv);

	cpu = smp_processor_id();
	stats = per_cpu_ptr(priv->stats, cpu);

	if (!(rcv->flags & IFF_UP))
		goto outf;

	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, rcv);
	if (dev->features & NETIF_F_NO_CSUM)
		skb->ip_summed = rcv_priv->ip_summed;

	dst_release(skb->dst);
	skb->dst = NULL;
	skb->mark = 0;
	secpath_reset(skb);
	nf_reset(skb);

	length = skb->len;

	stats->tx_bytes += length;
	stats->tx_packets++;

	stats = per_cpu_ptr(rcv_priv->stats, cpu);
	stats->rx_bytes += length;
	stats->rx_packets++;

	netif_rx(skb);
	return 0;

outf:
	kfree_skb(skb);
	stats->tx_dropped++;
	return 0;
}

/*
 * general routines
 */

static struct net_device_stats *veth_get_stats(struct net_device *dev)
{
	struct veth_priv *priv;
	struct net_device_stats *dev_stats;
	int cpu;
	struct veth_net_stats *stats;

	priv = netdev_priv(dev);
	dev_stats = &dev->stats;

	dev_stats->rx_packets = 0;
	dev_stats->tx_packets = 0;
	dev_stats->rx_bytes = 0;
	dev_stats->tx_bytes = 0;
	dev_stats->tx_dropped = 0;

	for_each_online_cpu(cpu) {
		stats = per_cpu_ptr(priv->stats, cpu);

		dev_stats->rx_packets += stats->rx_packets;
		dev_stats->tx_packets += stats->tx_packets;
		dev_stats->rx_bytes += stats->rx_bytes;
		dev_stats->tx_bytes += stats->tx_bytes;
		dev_stats->tx_dropped += stats->tx_dropped;
	}

	return dev_stats;
}

static int veth_open(struct net_device *dev)
{
	struct veth_priv *priv;

	priv = netdev_priv(dev);
	if (priv->peer == NULL)
		return -ENOTCONN;

	if (priv->peer->flags & IFF_UP) {
		netif_carrier_on(dev);
		netif_carrier_on(priv->peer);
	}
	return 0;
}

static int veth_dev_init(struct net_device *dev)
{
	struct veth_net_stats *stats;
	struct veth_priv *priv;

	stats = alloc_percpu(struct veth_net_stats);
	if (stats == NULL)
		return -ENOMEM;

	priv = netdev_priv(dev);
	priv->stats = stats;
	return 0;
}

static void veth_dev_free(struct net_device *dev)
{
	struct veth_priv *priv;

	priv = netdev_priv(dev);
	free_percpu(priv->stats);
	free_netdev(dev);
}

static const struct net_device_ops veth_netdev_ops = {
	.ndo_init	= veth_dev_init,
	.ndo_open	= veth_open,
	.ndo_start_xmit = veth_xmit,
	.ndo_get_stats	= veth_get_stats,
};

static void veth_setup(struct net_device *dev)
{
	ether_setup(dev);

	dev->netdev_ops = &veth_netdev_ops;
	dev->ethtool_ops = &veth_ethtool_ops;
	dev->features |= NETIF_F_LLTX;
	dev->destructor = veth_dev_free;
}

static void veth_change_state(struct net_device *dev)
{
	struct net_device *peer;
	struct veth_priv *priv;

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

	if (netif_carrier_ok(peer)) {
		if (!netif_carrier_ok(dev))
			netif_carrier_on(dev);
	} else {
		if (netif_carrier_ok(dev))
			netif_carrier_off(dev);
	}
}

static int veth_device_event(struct notifier_block *unused,
			     unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;

	if (dev->netdev_ops->ndo_open != veth_open)
		goto out;

	switch (event) {
	case NETDEV_CHANGE:
		veth_change_state(dev);
		break;
	}
out:
	return NOTIFY_DONE;
}

static struct notifier_block veth_notifier_block __read_mostly = {
	.notifier_call	= veth_device_event,
};

/*
 * netlink interface
 */

static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
{
	if (tb[IFLA_ADDRESS]) {
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
			return -EINVAL;
		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
			return -EADDRNOTAVAIL;
	}
	return 0;
}

static struct rtnl_link_ops veth_link_ops;

static int veth_newlink(struct net_device *dev,
			 struct nlattr *tb[], struct nlattr *data[])
{
	int err;
	struct net_device *peer;
	struct veth_priv *priv;
	char ifname[IFNAMSIZ];
	struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;

	/*
	 * create and register peer first
	 *
	 * struct ifinfomsg is at the head of VETH_INFO_PEER, but we
	 * skip it since no info from it is useful yet
	 */

	if (data != NULL && data[VETH_INFO_PEER] != NULL) {
		struct nlattr *nla_peer;

		nla_peer = data[VETH_INFO_PEER];
		err = nla_parse(peer_tb, IFLA_MAX,
				nla_data(nla_peer) + sizeof(struct ifinfomsg),
				nla_len(nla_peer) - sizeof(struct ifinfomsg),
				ifla_policy);
		if (err < 0)
			return err;

		err = veth_validate(peer_tb, NULL);
		if (err < 0)
			return err;

		tbp = peer_tb;
	} else
		tbp = tb;

	if (tbp[IFLA_IFNAME])
		nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
	else
		snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");

	peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
	if (IS_ERR(peer))
		return PTR_ERR(peer);

	if (tbp[IFLA_ADDRESS] == NULL)
		random_ether_addr(peer->dev_addr);

	err = register_netdevice(peer);
	if (err < 0)
		goto err_register_peer;

	netif_carrier_off(peer);

	/*
	 * register dev last
	 *
	 * note, that since we've registered new device the dev's name
	 * should be re-allocated
	 */

	if (tb[IFLA_ADDRESS] == NULL)
		random_ether_addr(dev->dev_addr);

	if (tb[IFLA_IFNAME])
		nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
	else
		snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");

	if (strchr(dev->name, '%')) {
		err = dev_alloc_name(dev, dev->name);
		if (err < 0)
			goto err_alloc_name;
	}

	err = register_netdevice(dev);
	if (err < 0)
		goto err_register_dev;

	netif_carrier_off(dev);

	/*
	 * tie the deviced together
	 */

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

	priv = netdev_priv(peer);
	priv->peer = dev;
	return 0;

err_register_dev:
	/* nothing to do */
err_alloc_name:
	unregister_netdevice(peer);
	return err;

err_register_peer:
	free_netdev(peer);
	return err;
}

static void veth_dellink(struct net_device *dev)
{
	struct veth_priv *priv;
	struct net_device *peer;

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

	unregister_netdevice(dev);
	unregister_netdevice(peer);
}

static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];

static struct rtnl_link_ops veth_link_ops = {
	.kind		= DRV_NAME,
	.priv_size	= sizeof(struct veth_priv),
	.setup		= veth_setup,
	.validate	= veth_validate,
	.newlink	= veth_newlink,
	.dellink	= veth_dellink,
	.policy		= veth_policy,
	.maxtype	= VETH_INFO_MAX,
};

/*
 * init/fini
 */

static __init int veth_init(void)
{
	register_netdevice_notifier(&veth_notifier_block);
	return rtnl_link_register(&veth_link_ops);
}

static __exit void veth_exit(void)
{
	rtnl_link_unregister(&veth_link_ops);
	unregister_netdevice_notifier(&veth_notifier_block);
}

module_init(veth_init);
module_exit(veth_exit);

MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_RTNL_LINK(DRV_NAME);
Commit	Line	Data
e314dbdc PE	1	/*
	2	* drivers/net/veth.c
	3	*
	4	* Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
	5	*
	6	* Author: Pavel Emelianov <xemul@openvz.org>
	7	* Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
	8	*
	9	*/
	10
e314dbdc PE	11	#include <linux/netdevice.h>
	12	#include <linux/ethtool.h>
	13	#include <linux/etherdevice.h>
	14
	15	#include <net/dst.h>
	16	#include <net/xfrm.h>
ecef969e	17	#include <linux/veth.h>
e314dbdc PE	18
	19	#define DRV_NAME "veth"
	20	#define DRV_VERSION "1.0"
	21
	22	struct veth_net_stats {
	23	unsigned long rx_packets;
	24	unsigned long tx_packets;
	25	unsigned long rx_bytes;
	26	unsigned long tx_bytes;
	27	unsigned long tx_dropped;
	28	};
	29
	30	struct veth_priv {
	31	struct net_device *peer;
e314dbdc PE	32	struct veth_net_stats *stats;
	33	unsigned ip_summed;
	34	};
	35
e314dbdc PE	36	/*
	37	* ethtool interface
	38	*/
	39
	40	static struct {
	41	const char string[ETH_GSTRING_LEN];
	42	} ethtool_stats_keys[] = {
	43	{ "peer_ifindex" },
	44	};
	45
	46	static int veth_get_settings(struct net_device dev, struct ethtool_cmd cmd)
	47	{
	48	cmd->supported = 0;
	49	cmd->advertising = 0;
	50	cmd->speed = SPEED_10000;
	51	cmd->duplex = DUPLEX_FULL;
	52	cmd->port = PORT_TP;
	53	cmd->phy_address = 0;
	54	cmd->transceiver = XCVR_INTERNAL;
	55	cmd->autoneg = AUTONEG_DISABLE;
	56	cmd->maxtxpkt = 0;
	57	cmd->maxrxpkt = 0;
	58	return 0;
	59	}
	60
	61	static void veth_get_drvinfo(struct net_device dev, struct ethtool_drvinfo info)
	62	{
	63	strcpy(info->driver, DRV_NAME);
	64	strcpy(info->version, DRV_VERSION);
	65	strcpy(info->fw_version, "N/A");
	66	}
	67
	68	static void veth_get_strings(struct net_device dev, u32 stringset, u8 buf)
	69	{
	70	switch(stringset) {
	71	case ETH_SS_STATS:
	72	memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
	73	break;
	74	}
	75	}
	76
b9f2c044	77	static int veth_get_sset_count(struct net_device *dev, int sset)
e314dbdc	78	{
b9f2c044 JG	79	switch (sset) {
	80	case ETH_SS_STATS:
	81	return ARRAY_SIZE(ethtool_stats_keys);
	82	default:
	83	return -EOPNOTSUPP;
	84	}
e314dbdc PE	85	}
	86
	87	static void veth_get_ethtool_stats(struct net_device *dev,
	88	struct ethtool_stats stats, u64 data)
	89	{
	90	struct veth_priv *priv;
	91
	92	priv = netdev_priv(dev);
	93	data[0] = priv->peer->ifindex;
	94	}
	95
	96	static u32 veth_get_rx_csum(struct net_device *dev)
	97	{
	98	struct veth_priv *priv;
	99
	100	priv = netdev_priv(dev);
	101	return priv->ip_summed == CHECKSUM_UNNECESSARY;
	102	}
	103
	104	static int veth_set_rx_csum(struct net_device *dev, u32 data)
	105	{
	106	struct veth_priv *priv;
	107
	108	priv = netdev_priv(dev);
	109	priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
	110	return 0;
	111	}
	112
	113	static u32 veth_get_tx_csum(struct net_device *dev)
	114	{
	115	return (dev->features & NETIF_F_NO_CSUM) != 0;
	116	}
	117
	118	static int veth_set_tx_csum(struct net_device *dev, u32 data)
	119	{
	120	if (data)
	121	dev->features \|= NETIF_F_NO_CSUM;
	122	else
	123	dev->features &= ~NETIF_F_NO_CSUM;
	124	return 0;
	125	}
	126
	127	static struct ethtool_ops veth_ethtool_ops = {
	128	.get_settings = veth_get_settings,
	129	.get_drvinfo = veth_get_drvinfo,
	130	.get_link = ethtool_op_get_link,
	131	.get_rx_csum = veth_get_rx_csum,
	132	.set_rx_csum = veth_set_rx_csum,
	133	.get_tx_csum = veth_get_tx_csum,
	134	.set_tx_csum = veth_set_tx_csum,
	135	.get_sg = ethtool_op_get_sg,
	136	.set_sg = ethtool_op_set_sg,
	137	.get_strings = veth_get_strings,
b9f2c044	138	.get_sset_count = veth_get_sset_count,
e314dbdc PE	139	.get_ethtool_stats = veth_get_ethtool_stats,
	140	};
	141
	142	/*
	143	* xmit
	144	*/
	145
	146	static int veth_xmit(struct sk_buff skb, struct net_device dev)
	147	{
	148	struct net_device *rcv = NULL;
	149	struct veth_priv priv, rcv_priv;
	150	struct veth_net_stats *stats;
	151	int length, cpu;
	152
	153	skb_orphan(skb);
	154
	155	priv = netdev_priv(dev);
	156	rcv = priv->peer;
	157	rcv_priv = netdev_priv(rcv);
	158
	159	cpu = smp_processor_id();
	160	stats = per_cpu_ptr(priv->stats, cpu);
	161
	162	if (!(rcv->flags & IFF_UP))
	163	goto outf;
	164
	165	skb->pkt_type = PACKET_HOST;
	166	skb->protocol = eth_type_trans(skb, rcv);
	167	if (dev->features & NETIF_F_NO_CSUM)
	168	skb->ip_summed = rcv_priv->ip_summed;
	169
	170	dst_release(skb->dst);
	171	skb->dst = NULL;
	172	skb->mark = 0;
	173	secpath_reset(skb);
	174	nf_reset(skb);
	175
	176	length = skb->len;
	177
	178	stats->tx_bytes += length;
	179	stats->tx_packets++;
	180
	181	stats = per_cpu_ptr(rcv_priv->stats, cpu);
	182	stats->rx_bytes += length;
	183	stats->rx_packets++;
	184
	185	netif_rx(skb);
	186	return 0;
	187
	188	outf:
	189	kfree_skb(skb);
	190	stats->tx_dropped++;
	191	return 0;
	192	}
	193
	194	/*
	195	* general routines
	196	*/
	197
	198	static struct net_device_stats veth_get_stats(struct net_device dev)
	199	{
	200	struct veth_priv *priv;
	201	struct net_device_stats *dev_stats;
	202	int cpu;
203	struct veth_net_stats *stats;
204
205	priv = netdev_priv(dev);
206	dev_stats = &dev->stats;
207
208	dev_stats->rx_packets = 0;
209	dev_stats->tx_packets = 0;
210	dev_stats->rx_bytes = 0;
211	dev_stats->tx_bytes = 0;
212	dev_stats->tx_dropped = 0;
213
214	for_each_online_cpu(cpu) {
215	stats = per_cpu_ptr(priv->stats, cpu);
216
217	dev_stats->rx_packets += stats->rx_packets;
218	dev_stats->tx_packets += stats->tx_packets;
219	dev_stats->rx_bytes += stats->rx_bytes;
220	dev_stats->tx_bytes += stats->tx_bytes;
221	dev_stats->tx_dropped += stats->tx_dropped;
222	}
223
224	return dev_stats;
225	}
226
227	static int veth_open(struct net_device *dev)
228	{
229	struct veth_priv *priv;
230
231	priv = netdev_priv(dev);
232	if (priv->peer == NULL)
233	return -ENOTCONN;
234
235	if (priv->peer->flags & IFF_UP) {
236	netif_carrier_on(dev);
237	netif_carrier_on(priv->peer);
238	}
239	return 0;
240	}
241
e314dbdc PE	242	static int veth_dev_init(struct net_device *dev)
	243	{
	244	struct veth_net_stats *stats;
	245	struct veth_priv *priv;
	246
	247	stats = alloc_percpu(struct veth_net_stats);
	248	if (stats == NULL)
	249	return -ENOMEM;
	250
	251	priv = netdev_priv(dev);
	252	priv->stats = stats;
	253	return 0;
	254	}
	255
	256	static void veth_dev_free(struct net_device *dev)
	257	{
	258	struct veth_priv *priv;
	259
	260	priv = netdev_priv(dev);
	261	free_percpu(priv->stats);
	262	free_netdev(dev);
	263	}
	264
4456e7bd SH	265	static const struct net_device_ops veth_netdev_ops = {
	266	.ndo_init = veth_dev_init,
	267	.ndo_open = veth_open,
00829823	268	.ndo_start_xmit = veth_xmit,
4456e7bd SH	269	.ndo_get_stats = veth_get_stats,
	270	};
	271
e314dbdc PE	272	static void veth_setup(struct net_device *dev)
	273	{
	274	ether_setup(dev);
	275
4456e7bd	276	dev->netdev_ops = &veth_netdev_ops;
e314dbdc PE	277	dev->ethtool_ops = &veth_ethtool_ops;
e314dbdc PE	278	dev->features \|= NETIF_F_LLTX;
e314dbdc PE	279	dev->destructor = veth_dev_free;
	280	}
	281
c15853f2 DL	282	static void veth_change_state(struct net_device *dev)
	283	{
	284	struct net_device *peer;
	285	struct veth_priv *priv;
	286
	287	priv = netdev_priv(dev);
	288	peer = priv->peer;
	289
	290	if (netif_carrier_ok(peer)) {
	291	if (!netif_carrier_ok(dev))
	292	netif_carrier_on(dev);
	293	} else {
	294	if (netif_carrier_ok(dev))
	295	netif_carrier_off(dev);
	296	}
	297	}
	298
	299	static int veth_device_event(struct notifier_block *unused,
	300	unsigned long event, void *ptr)
	301	{
	302	struct net_device *dev = ptr;
	303
4456e7bd	304	if (dev->netdev_ops->ndo_open != veth_open)
c15853f2 DL	305	goto out;
	306
	307	switch (event) {
	308	case NETDEV_CHANGE:
	309	veth_change_state(dev);
	310	break;
	311	}
	312	out:
	313	return NOTIFY_DONE;
	314	}
	315
	316	static struct notifier_block veth_notifier_block __read_mostly = {
	317	.notifier_call = veth_device_event,
	318	};
	319
e314dbdc PE	320	/*
	321	* netlink interface
	322	*/
	323
	324	static int veth_validate(struct nlattr tb[], struct nlattr data[])
	325	{
	326	if (tb[IFLA_ADDRESS]) {
	327	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	328	return -EINVAL;
	329	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	330	return -EADDRNOTAVAIL;
	331	}
	332	return 0;
	333	}
	334
	335	static struct rtnl_link_ops veth_link_ops;
	336
	337	static int veth_newlink(struct net_device *dev,
	338	struct nlattr tb[], struct nlattr data[])
	339	{
	340	int err;
	341	struct net_device *peer;
	342	struct veth_priv *priv;
	343	char ifname[IFNAMSIZ];
	344	struct nlattr peer_tb[IFLA_MAX + 1], *tbp;
	345
	346	/*
	347	* create and register peer first
	348	*
	349	* struct ifinfomsg is at the head of VETH_INFO_PEER, but we
	350	* skip it since no info from it is useful yet
	351	*/
	352
	353	if (data != NULL && data[VETH_INFO_PEER] != NULL) {
	354	struct nlattr *nla_peer;
	355
	356	nla_peer = data[VETH_INFO_PEER];
	357	err = nla_parse(peer_tb, IFLA_MAX,
	358	nla_data(nla_peer) + sizeof(struct ifinfomsg),
	359	nla_len(nla_peer) - sizeof(struct ifinfomsg),
	360	ifla_policy);
	361	if (err < 0)
	362	return err;
	363
	364	err = veth_validate(peer_tb, NULL);
	365	if (err < 0)
	366	return err;
	367
	368	tbp = peer_tb;
	369	} else
	370	tbp = tb;
	371
	372	if (tbp[IFLA_IFNAME])
	373	nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
	374	else
	375	snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
	376
c346dca1	377	peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
e314dbdc PE	378	if (IS_ERR(peer))
	379	return PTR_ERR(peer);
	380
	381	if (tbp[IFLA_ADDRESS] == NULL)
	382	random_ether_addr(peer->dev_addr);
	383
	384	err = register_netdevice(peer);
	385	if (err < 0)
	386	goto err_register_peer;
	387
	388	netif_carrier_off(peer);
	389
	390	/*
	391	* register dev last
	392	*
	393	* note, that since we've registered new device the dev's name
	394	* should be re-allocated
	395	*/
	396
	397	if (tb[IFLA_ADDRESS] == NULL)
	398	random_ether_addr(dev->dev_addr);
	399
	400	if (tb[IFLA_IFNAME])
	401	nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
	402	else
	403	snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
	404
	405	if (strchr(dev->name, '%')) {
	406	err = dev_alloc_name(dev, dev->name);
	407	if (err < 0)
	408	goto err_alloc_name;
	409	}
	410
	411	err = register_netdevice(dev);
	412	if (err < 0)
	413	goto err_register_dev;
	414
	415	netif_carrier_off(dev);
	416
	417	/*
	418	* tie the deviced together
	419	*/
	420
	421	priv = netdev_priv(dev);
e314dbdc	422	priv->peer = peer;
e314dbdc PE	423
e314dbdc PE	424	priv = netdev_priv(peer);
e314dbdc	425	priv->peer = dev;
e314dbdc PE	426	return 0;
	427
	428	err_register_dev:
	429	/* nothing to do */
	430	err_alloc_name:
	431	unregister_netdevice(peer);
	432	return err;
	433
	434	err_register_peer:
	435	free_netdev(peer);
	436	return err;
	437	}
	438
	439	static void veth_dellink(struct net_device *dev)
	440	{
	441	struct veth_priv *priv;
	442	struct net_device *peer;
	443
	444	priv = netdev_priv(dev);
	445	peer = priv->peer;
	446
e314dbdc PE	447	unregister_netdevice(dev);
	448	unregister_netdevice(peer);
	449	}
	450
	451	static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
	452
	453	static struct rtnl_link_ops veth_link_ops = {
	454	.kind = DRV_NAME,
	455	.priv_size = sizeof(struct veth_priv),
	456	.setup = veth_setup,
	457	.validate = veth_validate,
	458	.newlink = veth_newlink,
	459	.dellink = veth_dellink,
	460	.policy = veth_policy,
	461	.maxtype = VETH_INFO_MAX,
	462	};
	463
	464	/*
	465	* init/fini
	466	*/
	467
	468	static __init int veth_init(void)
	469	{
c15853f2	470	register_netdevice_notifier(&veth_notifier_block);
e314dbdc PE	471	return rtnl_link_register(&veth_link_ops);
	472	}
	473
	474	static __exit void veth_exit(void)
	475	{
68365458	476	rtnl_link_unregister(&veth_link_ops);
c15853f2	477	unregister_netdevice_notifier(&veth_notifier_block);
e314dbdc PE	478	}
	479
	480	module_init(veth_init);
	481	module_exit(veth_exit);
	482
	483	MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
	484	MODULE_LICENSE("GPL v2");
	485	MODULE_ALIAS_RTNL_LINK(DRV_NAME);