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* Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
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* Author: Pavel Emelianov <xemul@openvz.org>
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* Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/ethtool.h>
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#include <linux/etherdevice.h>
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#include <linux/u64_stats_sync.h>
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#include <linux/veth.h>
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#include <linux/module.h>
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#define DRV_NAME "veth"
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#define DRV_VERSION "1.0"
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#define MIN_MTU 68 /* Min L3 MTU */
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#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
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struct veth_net_stats {
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struct u64_stats_sync syncp;
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struct net_device *peer;
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struct veth_net_stats __percpu *stats;
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const char string[ETH_GSTRING_LEN];
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} ethtool_stats_keys[] = {
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static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
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ethtool_cmd_speed_set(cmd, SPEED_10000);
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cmd->duplex = DUPLEX_FULL;
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cmd->transceiver = XCVR_INTERNAL;
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cmd->autoneg = AUTONEG_DISABLE;
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static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
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strcpy(info->driver, DRV_NAME);
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strcpy(info->version, DRV_VERSION);
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strcpy(info->fw_version, "N/A");
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static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
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memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
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static int veth_get_sset_count(struct net_device *dev, int sset)
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return ARRAY_SIZE(ethtool_stats_keys);
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static void veth_get_ethtool_stats(struct net_device *dev,
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struct ethtool_stats *stats, u64 *data)
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struct veth_priv *priv;
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priv = netdev_priv(dev);
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data[0] = priv->peer->ifindex;
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static const struct ethtool_ops veth_ethtool_ops = {
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.get_settings = veth_get_settings,
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.get_drvinfo = veth_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_strings = veth_get_strings,
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.get_sset_count = veth_get_sset_count,
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.get_ethtool_stats = veth_get_ethtool_stats,
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static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
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struct net_device *rcv = NULL;
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struct veth_priv *priv, *rcv_priv;
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struct veth_net_stats *stats, *rcv_stats;
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priv = netdev_priv(dev);
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rcv_priv = netdev_priv(rcv);
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stats = this_cpu_ptr(priv->stats);
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rcv_stats = this_cpu_ptr(rcv_priv->stats);
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/* don't change ip_summed == CHECKSUM_PARTIAL, as that
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will cause bad checksum on forwarded packets */
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if (skb->ip_summed == CHECKSUM_NONE &&
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rcv->features & NETIF_F_RXCSUM)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
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u64_stats_update_begin(&stats->syncp);
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stats->tx_bytes += length;
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u64_stats_update_end(&stats->syncp);
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u64_stats_update_begin(&rcv_stats->syncp);
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rcv_stats->rx_bytes += length;
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rcv_stats->rx_packets++;
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u64_stats_update_end(&rcv_stats->syncp);
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u64_stats_update_begin(&rcv_stats->syncp);
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rcv_stats->rx_dropped++;
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u64_stats_update_end(&rcv_stats->syncp);
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static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot)
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struct veth_priv *priv = netdev_priv(dev);
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for_each_possible_cpu(cpu) {
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struct veth_net_stats *stats = per_cpu_ptr(priv->stats, cpu);
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u64 rx_packets, rx_bytes, rx_dropped;
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u64 tx_packets, tx_bytes;
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start = u64_stats_fetch_begin_bh(&stats->syncp);
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rx_packets = stats->rx_packets;
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tx_packets = stats->tx_packets;
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rx_bytes = stats->rx_bytes;
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tx_bytes = stats->tx_bytes;
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rx_dropped = stats->rx_dropped;
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} while (u64_stats_fetch_retry_bh(&stats->syncp, start));
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tot->rx_packets += rx_packets;
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tot->tx_packets += tx_packets;
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tot->rx_bytes += rx_bytes;
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tot->tx_bytes += tx_bytes;
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tot->rx_dropped += rx_dropped;
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static int veth_open(struct net_device *dev)
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struct veth_priv *priv;
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priv = netdev_priv(dev);
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if (priv->peer == NULL)
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if (priv->peer->flags & IFF_UP) {
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netif_carrier_on(dev);
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netif_carrier_on(priv->peer);
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static int veth_close(struct net_device *dev)
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struct veth_priv *priv = netdev_priv(dev);
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netif_carrier_off(dev);
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netif_carrier_off(priv->peer);
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static int is_valid_veth_mtu(int new_mtu)
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return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
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static int veth_change_mtu(struct net_device *dev, int new_mtu)
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if (!is_valid_veth_mtu(new_mtu))
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static int veth_dev_init(struct net_device *dev)
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struct veth_net_stats __percpu *stats;
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struct veth_priv *priv;
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stats = alloc_percpu(struct veth_net_stats);
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priv = netdev_priv(dev);
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static void veth_dev_free(struct net_device *dev)
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struct veth_priv *priv;
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priv = netdev_priv(dev);
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free_percpu(priv->stats);
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static const struct net_device_ops veth_netdev_ops = {
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.ndo_init = veth_dev_init,
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.ndo_open = veth_open,
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.ndo_stop = veth_close,
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.ndo_start_xmit = veth_xmit,
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.ndo_change_mtu = veth_change_mtu,
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.ndo_get_stats64 = veth_get_stats64,
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.ndo_set_mac_address = eth_mac_addr,
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static void veth_setup(struct net_device *dev)
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dev->priv_flags &= ~IFF_TX_SKB_SHARING;
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dev->netdev_ops = &veth_netdev_ops;
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dev->ethtool_ops = &veth_ethtool_ops;
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dev->features |= NETIF_F_LLTX;
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dev->destructor = veth_dev_free;
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dev->hw_features = NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
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static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
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return -EADDRNOTAVAIL;
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if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
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static struct rtnl_link_ops veth_link_ops;
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static int veth_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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struct net_device *peer;
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struct veth_priv *priv;
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char ifname[IFNAMSIZ];
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struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
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struct ifinfomsg *ifmp;
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* create and register peer first
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if (data != NULL && data[VETH_INFO_PEER] != NULL) {
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struct nlattr *nla_peer;
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nla_peer = data[VETH_INFO_PEER];
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ifmp = nla_data(nla_peer);
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err = nla_parse(peer_tb, IFLA_MAX,
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nla_data(nla_peer) + sizeof(struct ifinfomsg),
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nla_len(nla_peer) - sizeof(struct ifinfomsg),
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err = veth_validate(peer_tb, NULL);
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if (tbp[IFLA_IFNAME])
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nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
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snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
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net = rtnl_link_get_net(src_net, tbp);
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peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
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return PTR_ERR(peer);
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if (tbp[IFLA_ADDRESS] == NULL)
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random_ether_addr(peer->dev_addr);
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err = register_netdevice(peer);
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goto err_register_peer;
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netif_carrier_off(peer);
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err = rtnl_configure_link(peer, ifmp);
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goto err_configure_peer;
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* note, that since we've registered new device the dev's name
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* should be re-allocated
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if (tb[IFLA_ADDRESS] == NULL)
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random_ether_addr(dev->dev_addr);
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nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
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snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
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if (strchr(dev->name, '%')) {
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err = dev_alloc_name(dev, dev->name);
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err = register_netdevice(dev);
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goto err_register_dev;
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netif_carrier_off(dev);
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* tie the deviced together
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priv = netdev_priv(dev);
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priv = netdev_priv(peer);
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unregister_netdevice(peer);
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static void veth_dellink(struct net_device *dev, struct list_head *head)
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struct veth_priv *priv;
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struct net_device *peer;
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priv = netdev_priv(dev);
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unregister_netdevice_queue(dev, head);
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unregister_netdevice_queue(peer, head);
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static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
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static struct rtnl_link_ops veth_link_ops = {
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.priv_size = sizeof(struct veth_priv),
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.validate = veth_validate,
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.newlink = veth_newlink,
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.dellink = veth_dellink,
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.policy = veth_policy,
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.maxtype = VETH_INFO_MAX,
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static __init int veth_init(void)
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return rtnl_link_register(&veth_link_ops);
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static __exit void veth_exit(void)
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rtnl_link_unregister(&veth_link_ops);
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module_init(veth_init);
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module_exit(veth_exit);
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MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_RTNL_LINK(DRV_NAME);