Release 4.12 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 <linux/u64_stats_sync.h>

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


#define DRV_NAME	"veth"

#define DRV_VERSION	"1.0"


struct pcpu_vstats {
	
u64			packets;
	
u64			bytes;
	
struct u64_stats_sync	syncp;
};


struct veth_priv {
	
struct net_device __rcu	*peer;
	
atomic64_t		dropped;
	
unsigned		requested_headroom;
};

/*
 * ethtool interface
 */

static struct {
	
const char string[ETH_GSTRING_LEN];

} ethtool_stats_keys[] = {
	{ "peer_ifindex" },
};



static int veth_get_link_ksettings(struct net_device *dev,
				   struct ethtool_link_ksettings *cmd)
{
	cmd->base.speed		= SPEED_10000;
	cmd->base.duplex	= DUPLEX_FULL;
	cmd->base.port		= PORT_TP;
	cmd->base.autoneg	= AUTONEG_DISABLE;
	return 0;
}

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51
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static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
}

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48
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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;
	}
}

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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;
	}
}

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static void veth_get_ethtool_stats(struct net_device *dev,
		struct ethtool_stats *stats, u64 *data)
{
	struct veth_priv *priv = netdev_priv(dev);
	struct net_device *peer = rtnl_dereference(priv->peer);

	data[0] = peer ? peer->ifindex : 0;
}

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55
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static const struct ethtool_ops veth_ethtool_ops = {
	.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,
	.get_link_ksettings	= veth_get_link_ksettings,
};



static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct veth_priv *priv = netdev_priv(dev);
	struct net_device *rcv;
	int length = skb->len;

	rcu_read_lock();
	rcv = rcu_dereference(priv->peer);
	if (unlikely(!rcv)) {
		kfree_skb(skb);
		goto drop;
	}

	if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
		struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);

		u64_stats_update_begin(&stats->syncp);
		stats->bytes += length;
		stats->packets++;
		u64_stats_update_end(&stats->syncp);
	} else {
drop:
		atomic64_inc(&priv->dropped);
	}
	rcu_read_unlock();
	return NETDEV_TX_OK;
}

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32
22.54%
1
12.50%
Arnd Bergmann
9
6.34%
1
12.50%
Eric W. Biedermann
3
2.11%
1
12.50%
Patrick McHardy
1
0.70%
1
12.50%
Stephen Hemminger
1
0.70%
1
12.50%
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142
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8
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/*
 * general routines
 */



static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
{
	struct veth_priv *priv = netdev_priv(dev);
	int cpu;

	result->packets = 0;
	result->bytes = 0;
	for_each_possible_cpu(cpu) {
		struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
		u64 packets, bytes;
		unsigned int start;

		do {
			start = u64_stats_fetch_begin_irq(&stats->syncp);
			packets = stats->packets;
			bytes = stats->bytes;
		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
		result->packets += packets;
		result->bytes += bytes;
	}
	return atomic64_read(&priv->dropped);
}

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24
18.60%
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12.50%
Stephen Hemminger
6
4.65%
1
12.50%
David S. Miller
4
3.10%
1
12.50%
Eric W. Biedermann
3
2.33%
2
25.00%
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129
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8
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static void veth_get_stats64(struct net_device *dev,
			     struct rtnl_link_stats64 *tot)
{
	struct veth_priv *priv = netdev_priv(dev);
	struct net_device *peer;
	struct pcpu_vstats one;

	tot->tx_dropped = veth_stats_one(&one, dev);
	tot->tx_bytes = one.bytes;
	tot->tx_packets = one.packets;

	rcu_read_lock();
	peer = rcu_dereference(priv->peer);
	if (peer) {
		tot->rx_dropped = veth_stats_one(&one, peer);
		tot->rx_bytes = one.bytes;
		tot->rx_packets = one.packets;
	}
	rcu_read_unlock();
}

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2
1.79%
1
16.67%
Pavel Emelyanov
1
0.89%
1
16.67%
Stephen Hemminger
1
0.89%
1
16.67%
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112
100.00%
6
100.00%

/* fake multicast ability */


static void veth_set_multicast_list(struct net_device *dev)
{
}

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static int veth_open(struct net_device *dev)
{
	struct veth_priv *priv = netdev_priv(dev);
	struct net_device *peer = rtnl_dereference(priv->peer);

	if (!peer)
		return -ENOTCONN;

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

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static int veth_close(struct net_device *dev)
{
	struct veth_priv *priv = netdev_priv(dev);
	struct net_device *peer = rtnl_dereference(priv->peer);

	netif_carrier_off(dev);
	if (peer)
		netif_carrier_off(peer);

	return 0;
}

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50
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2
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static int is_valid_veth_mtu(int mtu)
{
	return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU;
}

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static int veth_dev_init(struct net_device *dev)
{
	dev->vstats = netdev_alloc_pcpu_stats(struct pcpu_vstats);
	if (!dev->vstats)
		return -ENOMEM;
	return 0;
}

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Américo Wang
1
2.86%
1
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35
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static void veth_dev_free(struct net_device *dev)
{
	free_percpu(dev->vstats);
}

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#ifdef CONFIG_NET_POLL_CONTROLLER


static void veth_poll_controller(struct net_device *dev)
{
	/* veth only receives frames when its peer sends one
         * Since it's a synchronous operation, we are guaranteed
         * never to have pending data when we poll for it so
         * there is nothing to do here.
         *
         * We need this though so netpoll recognizes us as an interface that
         * supports polling, which enables bridge devices in virt setups to
         * still use netconsole
         */
}
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#endif	/* CONFIG_NET_POLL_CONTROLLER */



static int veth_get_iflink(const struct net_device *dev)
{
	struct veth_priv *priv = netdev_priv(dev);
	struct net_device *peer;
	int iflink;

	rcu_read_lock();
	peer = rcu_dereference(priv->peer);
	iflink = peer ? peer->ifindex : 0;
	rcu_read_unlock();

	return iflink;
}

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static void veth_set_rx_headroom(struct net_device *dev, int new_hr)
{
	struct veth_priv *peer_priv, *priv = netdev_priv(dev);
	struct net_device *peer;

	if (new_hr < 0)
		new_hr = 0;

	rcu_read_lock();
	peer = rcu_dereference(priv->peer);
	if (unlikely(!peer))
		goto out;

	peer_priv = netdev_priv(peer);
	priv->requested_headroom = new_hr;
	new_hr = max(priv->requested_headroom, peer_priv->requested_headroom);
	dev->needed_headroom = new_hr;
	peer->needed_headroom = new_hr;

out:
	rcu_read_unlock();
}

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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_get_stats64     = veth_get_stats64,
	.ndo_set_rx_mode     = veth_set_multicast_list,
	.ndo_set_mac_address = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= veth_poll_controller,
#endif
	.ndo_get_iflink		= veth_get_iflink,
	.ndo_features_check	= passthru_features_check,
	.ndo_set_rx_headroom	= veth_set_rx_headroom,
};


#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
                       NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \
                       NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \
                       NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
                       NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )



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

	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
	dev->priv_flags |= IFF_NO_QUEUE;
	dev->priv_flags |= IFF_PHONY_HEADROOM;

	dev->netdev_ops = &veth_netdev_ops;
	dev->ethtool_ops = &veth_ethtool_ops;
	dev->features |= NETIF_F_LLTX;
	dev->features |= VETH_FEATURES;
	dev->vlan_features = dev->features &
			     ~(NETIF_F_HW_VLAN_CTAG_TX |
			       NETIF_F_HW_VLAN_STAG_TX |
			       NETIF_F_HW_VLAN_CTAG_RX |
			       NETIF_F_HW_VLAN_STAG_RX);
	dev->needs_free_netdev = true;
	dev->priv_destructor = veth_dev_free;
	dev->max_mtu = ETH_MAX_MTU;

	dev->hw_features = VETH_FEATURES;
	dev->hw_enc_features = VETH_FEATURES;
	dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
}

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13
10.48%
2
12.50%
David Ahern
8
6.45%
1
6.25%
David S. Miller
8
6.45%
2
12.50%
Flavio Leitner
8
6.45%
1
6.25%
Toshiaki Makita
7
5.65%
1
6.25%
Neil Horman
7
5.65%
1
6.25%
Paolo Abeni
6
4.84%
1
6.25%
Jarod Wilson
6
4.84%
1
6.25%
Hannes Frederic Sowa
6
4.84%
1
6.25%
Phil Sutter
6
4.84%
1
6.25%
Michał Mirosław
5
4.03%
1
6.25%
Vlad Yasevich
4
3.23%
1
6.25%
Stephen Hemminger
3
2.42%
1
6.25%
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124
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16
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/*
 * 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;
}

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91
100.00%
2
100.00%


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;
	unsigned char name_assign_type;
	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 = rtnl_nla_parse_ifla(peer_tb,
					  nla_data(nla_peer) + sizeof(struct ifinfomsg),
					  nla_len(nla_peer) - sizeof(struct ifinfomsg),
					  NULL);
		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 (ifmp && tbp[IFLA_IFNAME]) {
		nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
		name_assign_type = NET_NAME_USER;
	} else {
		snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
		name_assign_type = NET_NAME_ENUM;
	}

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

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

	if (!ifmp || !tbp[IFLA_ADDRESS])
		eth_hw_addr_random(peer);

	if (ifmp && (dev->ifindex != 0))
		peer->ifindex = ifmp->ifi_index;

	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)
		eth_hw_addr_random(dev);

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

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

	netif_carrier_off(dev);

	/*
         * tie the deviced together
         */

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

	priv = netdev_priv(peer);
	rcu_assign_pointer(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;
}

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50
10.04%
2
15.38%
Patrick McHardy
39
7.83%
1
7.69%
Jiri Pirko
35
7.03%
2
15.38%
Tom Gundersen
18
3.61%
1
7.69%
Eric Dumazet
8
1.61%
1
7.69%
Serhey Popovych
6
1.20%
1
7.69%
Johannes Berg
2
0.40%
1
7.69%
Hideaki Yoshifuji / 吉藤英明
2
0.40%
1
7.69%
Danny Kukawka
2
0.40%
1
7.69%
Total
498
100.00%
13
100.00%



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 = rtnl_dereference(priv->peer);

	/* Note : dellink() is called from default_device_exit_batch(),
         * before a rcu_synchronize() point. The devices are guaranteed
         * not being freed before one RCU grace period.
         */
	RCU_INIT_POINTER(priv->peer, NULL);
	unregister_netdevice_queue(dev, head);

	if (peer) {
		priv = netdev_priv(peer);
		RCU_INIT_POINTER(priv->peer, NULL);
		unregister_netdevice_queue(peer, head);
	}
}

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38
43.18%
1
20.00%
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88
100.00%
5
100.00%


static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
	[VETH_INFO_PEER]	= { .len = sizeof(struct ifinfomsg) },
};



static struct net *veth_get_link_net(const struct net_device *dev)
{
	struct veth_priv *priv = netdev_priv(dev);
	struct net_device *peer = rtnl_dereference(priv->peer);

	return peer ? dev_net(peer) : dev_net(dev);
}

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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,
	.get_link_net	= veth_get_link_net,
};

/*
 * init/fini
 */



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

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pavel Emelyanov
14
93.33%
1
50.00%
Patrick McHardy
1
6.67%
1
50.00%
Total
15
100.00%
2
100.00%


module_init(veth_init);

module_exit(veth_exit);

MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
MODULE_LICENSE("GPL v2");

MODULE_ALIAS_RTNL_LINK(DRV_NAME);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Pavel Emelyanov
992
45.23%
2
3.23%
Eric Dumazet
443
20.20%
11
17.74%
Eric W. Biedermann
138
6.29%
5
8.06%
Paolo Abeni
122
5.56%
1
1.61%
Nicolas Dichtel
117
5.34%
2
3.23%
Patrick McHardy
41
1.87%
3
4.84%
Stephen Hemminger
41
1.87%
7
11.29%
Jiri Pirko
38
1.73%
2
3.23%
Américo Wang
30
1.37%
2
3.23%
David S. Miller
28
1.28%
2
3.23%
Jeff Garzik
20
0.91%
1
1.61%
Tom Gundersen
18
0.82%
1
1.61%
Thomas Graf
17
0.78%
1
1.61%
Gao Feng
16
0.73%
1
1.61%
Philippe Reynes
16
0.73%
1
1.61%
Rick Jones
16
0.73%
1
1.61%
Toshiaki Makita
12
0.55%
2
3.23%
Jarod Wilson
11
0.50%
1
1.61%
Arnd Bergmann
9
0.41%
1
1.61%
Flavio Leitner
8
0.36%
1
1.61%
David Ahern
8
0.36%
1
1.61%
Neil Horman
7
0.32%
1
1.61%
Hannes Frederic Sowa
6
0.27%
1
1.61%
Phil Sutter
6
0.27%
1
1.61%
Serhey Popovych
6
0.27%
1
1.61%
Michał Mirosław
5
0.23%
1
1.61%
Daniel Lezcano
5
0.23%
1
1.61%
Vlad Yasevich
4
0.18%
1
1.61%
Paul Gortmaker
3
0.14%
1
1.61%
Tejun Heo
3
0.14%
1
1.61%
Danny Kukawka
2
0.09%
1
1.61%
Johannes Berg
2
0.09%
1
1.61%
Hideaki Yoshifuji / 吉藤英明
2
0.09%
1
1.61%
Xin Long
1
0.05%
1
1.61%
Total
2193
100.00%
62
100.00%
Directory: drivers/net

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