[mirror_ubuntu-artful-kernel.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/slab.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"

#define MIN_MTU 68		/* Min L3 MTU */
#define MAX_MTU 65535		/* Max L3 MTU (arbitrary) */
#define MTU_PAD (ETH_HLEN + 4)  /* Max difference between L2 and L3 size MTU */

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

struct veth_priv {
	struct net_device *peer;
	struct veth_net_stats __percpu *stats;
};

/*
 * 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 const struct ethtool_ops veth_ethtool_ops = {
	.get_settings		= veth_get_settings,
	.get_drvinfo		= veth_get_drvinfo,
	.get_link		= ethtool_op_get_link,
	.get_strings		= veth_get_strings,
	.get_sset_count		= veth_get_sset_count,
	.get_ethtool_stats	= veth_get_ethtool_stats,
};

/*
 * xmit
 */

static netdev_tx_t 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, *rcv_stats;
	int length;

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

	stats = this_cpu_ptr(priv->stats);
	rcv_stats = this_cpu_ptr(rcv_priv->stats);

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

	/* don't change ip_summed == CHECKSUM_PARTIAL, as that
	   will cause bad checksum on forwarded packets */
	if (skb->ip_summed == CHECKSUM_NONE &&
	    rcv->features & NETIF_F_RXCSUM)
		skb->ip_summed = CHECKSUM_UNNECESSARY;

	length = skb->len;
	if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
		goto rx_drop;

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

	rcv_stats->rx_bytes += length;
	rcv_stats->rx_packets++;

	return NETDEV_TX_OK;

tx_drop:
	kfree_skb(skb);
	stats->tx_dropped++;
	return NETDEV_TX_OK;

rx_drop:
	rcv_stats->rx_dropped++;
	return NETDEV_TX_OK;
}

/*
 * general routines
 */

static struct net_device_stats *veth_get_stats(struct net_device *dev)
{
	struct veth_priv *priv;
	int cpu;
	struct veth_net_stats *stats, total = {0};

	priv = netdev_priv(dev);

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

		total.rx_packets += stats->rx_packets;
		total.tx_packets += stats->tx_packets;
		total.rx_bytes   += stats->rx_bytes;
		total.tx_bytes   += stats->tx_bytes;
		total.tx_dropped += stats->tx_dropped;
		total.rx_dropped += stats->rx_dropped;
	}
	dev->stats.rx_packets = total.rx_packets;
	dev->stats.tx_packets = total.tx_packets;
	dev->stats.rx_bytes   = total.rx_bytes;
	dev->stats.tx_bytes   = total.tx_bytes;
	dev->stats.tx_dropped = total.tx_dropped;
	dev->stats.rx_dropped = total.rx_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_close(struct net_device *dev)
{
	struct veth_priv *priv = netdev_priv(dev);

	netif_carrier_off(dev);
	netif_carrier_off(priv->peer);

	return 0;
}

static int is_valid_veth_mtu(int new_mtu)
{
	return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
}

static int veth_change_mtu(struct net_device *dev, int new_mtu)
{
	if (!is_valid_veth_mtu(new_mtu))
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}

static int veth_dev_init(struct net_device *dev)
{
	struct veth_net_stats __percpu *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_stop            = veth_close,
	.ndo_start_xmit      = veth_xmit,
	.ndo_change_mtu      = veth_change_mtu,
	.ndo_get_stats       = veth_get_stats,
	.ndo_set_mac_address = eth_mac_addr,
};

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;

	dev->hw_features = NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
}

/*
 * 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;
	}
	if (tb[IFLA_MTU]) {
		if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
			return -EINVAL;
	}
	return 0;
}

static struct rtnl_link_ops veth_link_ops;

static int veth_newlink(struct net *src_net, 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;
	struct ifinfomsg *ifmp;
	struct net *net;

	/*
	 * create and register peer first
	 */
	if (data != NULL && data[VETH_INFO_PEER] != NULL) {
		struct nlattr *nla_peer;

		nla_peer = data[VETH_INFO_PEER];
		ifmp = nla_data(nla_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 {
		ifmp = NULL;
		tbp = tb;
	}

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

	net = rtnl_link_get_net(src_net, tbp);
	if (IS_ERR(net))
		return PTR_ERR(net);

	peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
	if (IS_ERR(peer)) {
		put_net(net);
		return PTR_ERR(peer);
	}

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

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

	netif_carrier_off(peer);

	err = rtnl_configure_link(peer, ifmp);
	if (err < 0)
		goto err_configure_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);

	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_configure_peer:
	unregister_netdevice(peer);
	return err;

err_register_peer:
	free_netdev(peer);
	return err;
}

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

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

	unregister_netdevice_queue(dev, head);
	unregister_netdevice_queue(peer, head);
}

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)
{
	return rtnl_link_register(&veth_link_ops);
}

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

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	11	#include <linux/netdevice.h>
5a0e3ad6	12	#include <linux/slab.h>
e314dbdc PE	13	#include <linux/ethtool.h>
	14	#include <linux/etherdevice.h>
	15
	16	#include <net/dst.h>
	17	#include <net/xfrm.h>
ecef969e	18	#include <linux/veth.h>
e314dbdc PE	19
	20	#define DRV_NAME "veth"
	21	#define DRV_VERSION "1.0"
	22
38d40815 EB	23	#define MIN_MTU 68 /* Min L3 MTU */
	24	#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
	25	#define MTU_PAD (ETH_HLEN + 4) /* Max difference between L2 and L3 size MTU */
	26
e314dbdc PE	27	struct veth_net_stats {
	28	unsigned long rx_packets;
	29	unsigned long tx_packets;
	30	unsigned long rx_bytes;
	31	unsigned long tx_bytes;
	32	unsigned long tx_dropped;
38d40815	33	unsigned long rx_dropped;
e314dbdc PE	34	};
	35
	36	struct veth_priv {
	37	struct net_device *peer;
47d74275	38	struct veth_net_stats __percpu *stats;
e314dbdc PE	39	};
e314dbdc PE	40
e314dbdc PE	41	/*
	42	* ethtool interface
	43	*/
	44
	45	static struct {
	46	const char string[ETH_GSTRING_LEN];
	47	} ethtool_stats_keys[] = {
	48	{ "peer_ifindex" },
	49	};
	50
	51	static int veth_get_settings(struct net_device dev, struct ethtool_cmd cmd)
	52	{
	53	cmd->supported = 0;
	54	cmd->advertising = 0;
	55	cmd->speed = SPEED_10000;
	56	cmd->duplex = DUPLEX_FULL;
	57	cmd->port = PORT_TP;
	58	cmd->phy_address = 0;
	59	cmd->transceiver = XCVR_INTERNAL;
	60	cmd->autoneg = AUTONEG_DISABLE;
	61	cmd->maxtxpkt = 0;
	62	cmd->maxrxpkt = 0;
	63	return 0;
	64	}
	65
	66	static void veth_get_drvinfo(struct net_device dev, struct ethtool_drvinfo info)
	67	{
	68	strcpy(info->driver, DRV_NAME);
	69	strcpy(info->version, DRV_VERSION);
	70	strcpy(info->fw_version, "N/A");
	71	}
	72
	73	static void veth_get_strings(struct net_device dev, u32 stringset, u8 buf)
	74	{
	75	switch(stringset) {
	76	case ETH_SS_STATS:
	77	memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
	78	break;
	79	}
	80	}
	81
b9f2c044	82	static int veth_get_sset_count(struct net_device *dev, int sset)
e314dbdc	83	{
b9f2c044 JG	84	switch (sset) {
	85	case ETH_SS_STATS:
	86	return ARRAY_SIZE(ethtool_stats_keys);
	87	default:
	88	return -EOPNOTSUPP;
	89	}
e314dbdc PE	90	}
	91
	92	static void veth_get_ethtool_stats(struct net_device *dev,
	93	struct ethtool_stats stats, u64 data)
	94	{
	95	struct veth_priv *priv;
	96
	97	priv = netdev_priv(dev);
	98	data[0] = priv->peer->ifindex;
	99	}
	100
0fc0b732	101	static const struct ethtool_ops veth_ethtool_ops = {
e314dbdc PE	102	.get_settings = veth_get_settings,
	103	.get_drvinfo = veth_get_drvinfo,
	104	.get_link = ethtool_op_get_link,
e314dbdc	105	.get_strings = veth_get_strings,
b9f2c044	106	.get_sset_count = veth_get_sset_count,
e314dbdc PE	107	.get_ethtool_stats = veth_get_ethtool_stats,
	108	};
	109
	110	/*
	111	* xmit
	112	*/
	113
424efe9c	114	static netdev_tx_t veth_xmit(struct sk_buff skb, struct net_device dev)
e314dbdc PE	115	{
	116	struct net_device *rcv = NULL;
	117	struct veth_priv priv, rcv_priv;
38d40815	118	struct veth_net_stats stats, rcv_stats;
e7dcaa47	119	int length;
e314dbdc	120
e314dbdc PE	121	priv = netdev_priv(dev);
	122	rcv = priv->peer;
	123	rcv_priv = netdev_priv(rcv);
	124
e7dcaa47 CL	125	stats = this_cpu_ptr(priv->stats);
e7dcaa47 CL	126	rcv_stats = this_cpu_ptr(rcv_priv->stats);
e314dbdc PE	127
e314dbdc PE	128	if (!(rcv->flags & IFF_UP))
38d40815 EB	129	goto tx_drop;
38d40815 EB	130
0b796750 MM	131	/* don't change ip_summed == CHECKSUM_PARTIAL, as that
0b796750 MM	132	will cause bad checksum on forwarded packets */
a2c725fa MM	133	if (skb->ip_summed == CHECKSUM_NONE &&
	134	rcv->features & NETIF_F_RXCSUM)
	135	skb->ip_summed = CHECKSUM_UNNECESSARY;
e314dbdc	136
675071a2	137	length = skb->len;
44540960 AB	138	if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
44540960 AB	139	goto rx_drop;
e314dbdc PE	140
	141	stats->tx_bytes += length;
	142	stats->tx_packets++;
	143
38d40815 EB	144	rcv_stats->rx_bytes += length;
38d40815 EB	145	rcv_stats->rx_packets++;
e314dbdc	146
6ed10654	147	return NETDEV_TX_OK;
e314dbdc	148
38d40815	149	tx_drop:
e314dbdc PE	150	kfree_skb(skb);
e314dbdc PE	151	stats->tx_dropped++;
6ed10654	152	return NETDEV_TX_OK;
38d40815 EB	153
38d40815 EB	154	rx_drop:
38d40815	155	rcv_stats->rx_dropped++;
6ed10654	156	return NETDEV_TX_OK;
e314dbdc PE	157	}
	158
	159	/*
	160	* general routines
	161	*/
	162
	163	static struct net_device_stats veth_get_stats(struct net_device dev)
	164	{
11687a10	165	struct veth_priv *priv;
11687a10	166	int cpu;
2b1c8b0f	167	struct veth_net_stats *stats, total = {0};
e314dbdc	168
11687a10	169	priv = netdev_priv(dev);
e314dbdc	170
2b1c8b0f	171	for_each_possible_cpu(cpu) {
11687a10	172	stats = per_cpu_ptr(priv->stats, cpu);
e314dbdc	173
2b1c8b0f ED	174	total.rx_packets += stats->rx_packets;
	175	total.tx_packets += stats->tx_packets;
	176	total.rx_bytes += stats->rx_bytes;
	177	total.tx_bytes += stats->tx_bytes;
	178	total.tx_dropped += stats->tx_dropped;
	179	total.rx_dropped += stats->rx_dropped;
11687a10	180	}
2b1c8b0f ED	181	dev->stats.rx_packets = total.rx_packets;
	182	dev->stats.tx_packets = total.tx_packets;
	183	dev->stats.rx_bytes = total.rx_bytes;
	184	dev->stats.tx_bytes = total.tx_bytes;
	185	dev->stats.tx_dropped = total.tx_dropped;
	186	dev->stats.rx_dropped = total.rx_dropped;
	187
	188	return &dev->stats;
e314dbdc PE	189	}
	190
	191	static int veth_open(struct net_device *dev)
	192	{
	193	struct veth_priv *priv;
	194
	195	priv = netdev_priv(dev);
	196	if (priv->peer == NULL)
	197	return -ENOTCONN;
	198
	199	if (priv->peer->flags & IFF_UP) {
	200	netif_carrier_on(dev);
	201	netif_carrier_on(priv->peer);
	202	}
	203	return 0;
	204	}
	205
2cf48a10 EB	206	static int veth_close(struct net_device *dev)
	207	{
	208	struct veth_priv *priv = netdev_priv(dev);
	209
	210	netif_carrier_off(dev);
	211	netif_carrier_off(priv->peer);
	212
	213	return 0;
	214	}
	215
38d40815 EB	216	static int is_valid_veth_mtu(int new_mtu)
38d40815 EB	217	{
807540ba	218	return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
38d40815 EB	219	}
	220
	221	static int veth_change_mtu(struct net_device *dev, int new_mtu)
	222	{
	223	if (!is_valid_veth_mtu(new_mtu))
	224	return -EINVAL;
	225	dev->mtu = new_mtu;
	226	return 0;
	227	}
	228
e314dbdc PE	229	static int veth_dev_init(struct net_device *dev)
e314dbdc PE	230	{
47d74275	231	struct veth_net_stats __percpu *stats;
e314dbdc PE	232	struct veth_priv *priv;
	233
	234	stats = alloc_percpu(struct veth_net_stats);
	235	if (stats == NULL)
	236	return -ENOMEM;
	237
	238	priv = netdev_priv(dev);
	239	priv->stats = stats;
	240	return 0;
	241	}
	242
11687a10 DM	243	static void veth_dev_free(struct net_device *dev)
	244	{
	245	struct veth_priv *priv;
	246
	247	priv = netdev_priv(dev);
	248	free_percpu(priv->stats);
	249	free_netdev(dev);
	250	}
	251
4456e7bd	252	static const struct net_device_ops veth_netdev_ops = {
ee923623 DL	253	.ndo_init = veth_dev_init,
ee923623 DL	254	.ndo_open = veth_open,
2cf48a10	255	.ndo_stop = veth_close,
ee923623	256	.ndo_start_xmit = veth_xmit,
38d40815	257	.ndo_change_mtu = veth_change_mtu,
ee923623 DL	258	.ndo_get_stats = veth_get_stats,
ee923623 DL	259	.ndo_set_mac_address = eth_mac_addr,
4456e7bd SH	260	};
4456e7bd SH	261
e314dbdc PE	262	static void veth_setup(struct net_device *dev)
	263	{
	264	ether_setup(dev);
	265
4456e7bd	266	dev->netdev_ops = &veth_netdev_ops;
e314dbdc PE	267	dev->ethtool_ops = &veth_ethtool_ops;
e314dbdc PE	268	dev->features \|= NETIF_F_LLTX;
11687a10	269	dev->destructor = veth_dev_free;
a2c725fa MM	270
a2c725fa MM	271	dev->hw_features = NETIF_F_NO_CSUM \| NETIF_F_SG \| NETIF_F_RXCSUM;
e314dbdc PE	272	}
	273
	274	/*
	275	* netlink interface
	276	*/
	277
	278	static int veth_validate(struct nlattr tb[], struct nlattr data[])
	279	{
	280	if (tb[IFLA_ADDRESS]) {
	281	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	282	return -EINVAL;
	283	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	284	return -EADDRNOTAVAIL;
	285	}
38d40815 EB	286	if (tb[IFLA_MTU]) {
	287	if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
	288	return -EINVAL;
	289	}
e314dbdc PE	290	return 0;
	291	}
	292
	293	static struct rtnl_link_ops veth_link_ops;
	294
81adee47	295	static int veth_newlink(struct net src_net, struct net_device dev,
e314dbdc PE	296	struct nlattr tb[], struct nlattr data[])
	297	{
	298	int err;
	299	struct net_device *peer;
	300	struct veth_priv *priv;
	301	char ifname[IFNAMSIZ];
	302	struct nlattr peer_tb[IFLA_MAX + 1], *tbp;
3729d502	303	struct ifinfomsg *ifmp;
81adee47	304	struct net *net;
e314dbdc PE	305
	306	/*
	307	* create and register peer first
e314dbdc	308	*/
e314dbdc PE	309	if (data != NULL && data[VETH_INFO_PEER] != NULL) {
	310	struct nlattr *nla_peer;
	311
	312	nla_peer = data[VETH_INFO_PEER];
3729d502	313	ifmp = nla_data(nla_peer);
e314dbdc PE	314	err = nla_parse(peer_tb, IFLA_MAX,
	315	nla_data(nla_peer) + sizeof(struct ifinfomsg),
	316	nla_len(nla_peer) - sizeof(struct ifinfomsg),
	317	ifla_policy);
	318	if (err < 0)
	319	return err;
	320
	321	err = veth_validate(peer_tb, NULL);
	322	if (err < 0)
	323	return err;
	324
	325	tbp = peer_tb;
3729d502 PM	326	} else {
3729d502 PM	327	ifmp = NULL;
e314dbdc	328	tbp = tb;
3729d502	329	}
e314dbdc PE	330
	331	if (tbp[IFLA_IFNAME])
	332	nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
	333	else
	334	snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
	335
81adee47 EB	336	net = rtnl_link_get_net(src_net, tbp);
	337	if (IS_ERR(net))
	338	return PTR_ERR(net);
	339
	340	peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
	341	if (IS_ERR(peer)) {
	342	put_net(net);
e314dbdc	343	return PTR_ERR(peer);
81adee47	344	}
e314dbdc PE	345
	346	if (tbp[IFLA_ADDRESS] == NULL)
	347	random_ether_addr(peer->dev_addr);
	348
	349	err = register_netdevice(peer);
81adee47 EB	350	put_net(net);
81adee47 EB	351	net = NULL;
e314dbdc PE	352	if (err < 0)
	353	goto err_register_peer;
	354
	355	netif_carrier_off(peer);
	356
3729d502 PM	357	err = rtnl_configure_link(peer, ifmp);
	358	if (err < 0)
	359	goto err_configure_peer;
	360
e314dbdc PE	361	/*
	362	* register dev last
	363	*
	364	* note, that since we've registered new device the dev's name
	365	* should be re-allocated
	366	*/
	367
	368	if (tb[IFLA_ADDRESS] == NULL)
	369	random_ether_addr(dev->dev_addr);
	370
e314dbdc PE	371	err = register_netdevice(dev);
	372	if (err < 0)
	373	goto err_register_dev;
	374
	375	netif_carrier_off(dev);
	376
	377	/*
	378	* tie the deviced together
	379	*/
	380
	381	priv = netdev_priv(dev);
e314dbdc	382	priv->peer = peer;
e314dbdc PE	383
e314dbdc PE	384	priv = netdev_priv(peer);
e314dbdc	385	priv->peer = dev;
e314dbdc PE	386	return 0;
	387
	388	err_register_dev:
	389	/* nothing to do */
3729d502	390	err_configure_peer:
e314dbdc PE	391	unregister_netdevice(peer);
	392	return err;
	393
	394	err_register_peer:
	395	free_netdev(peer);
	396	return err;
	397	}
	398
23289a37	399	static void veth_dellink(struct net_device dev, struct list_head head)
e314dbdc PE	400	{
	401	struct veth_priv *priv;
	402	struct net_device *peer;
	403
	404	priv = netdev_priv(dev);
	405	peer = priv->peer;
	406
24540535 ED	407	unregister_netdevice_queue(dev, head);
24540535 ED	408	unregister_netdevice_queue(peer, head);
e314dbdc PE	409	}
	410
	411	static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
	412
	413	static struct rtnl_link_ops veth_link_ops = {
	414	.kind = DRV_NAME,
	415	.priv_size = sizeof(struct veth_priv),
	416	.setup = veth_setup,
	417	.validate = veth_validate,
	418	.newlink = veth_newlink,
	419	.dellink = veth_dellink,
	420	.policy = veth_policy,
	421	.maxtype = VETH_INFO_MAX,
	422	};
	423
	424	/*
	425	* init/fini
	426	*/
	427
	428	static __init int veth_init(void)
	429	{
	430	return rtnl_link_register(&veth_link_ops);
	431	}
	432
	433	static __exit void veth_exit(void)
	434	{
68365458	435	rtnl_link_unregister(&veth_link_ops);
e314dbdc PE	436	}
	437
	438	module_init(veth_init);
	439	module_exit(veth_exit);
	440
	441	MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
	442	MODULE_LICENSE("GPL v2");
	443	MODULE_ALIAS_RTNL_LINK(DRV_NAME);