491 lines
10 KiB
C
491 lines
10 KiB
C
/*
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* drivers/net/veth.c
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*
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* Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
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*
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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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*
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*/
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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 <net/dst.h>
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#include <net/xfrm.h>
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#include <linux/veth.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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#define MTU_PAD (ETH_HLEN + 4) /* Max difference between L2 and L3 size MTU */
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struct veth_net_stats {
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unsigned long rx_packets;
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unsigned long tx_packets;
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unsigned long rx_bytes;
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unsigned long tx_bytes;
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unsigned long tx_dropped;
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unsigned long rx_dropped;
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};
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struct veth_priv {
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struct net_device *peer;
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struct veth_net_stats __percpu *stats;
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unsigned ip_summed;
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};
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/*
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* ethtool interface
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*/
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static struct {
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const char string[ETH_GSTRING_LEN];
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} ethtool_stats_keys[] = {
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{ "peer_ifindex" },
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};
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static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
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{
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cmd->supported = 0;
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cmd->advertising = 0;
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cmd->speed = SPEED_10000;
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cmd->duplex = DUPLEX_FULL;
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cmd->port = PORT_TP;
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cmd->phy_address = 0;
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cmd->transceiver = XCVR_INTERNAL;
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cmd->autoneg = AUTONEG_DISABLE;
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cmd->maxtxpkt = 0;
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cmd->maxrxpkt = 0;
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return 0;
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}
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static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
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{
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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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}
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static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
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{
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switch(stringset) {
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case ETH_SS_STATS:
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memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
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break;
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}
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}
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static int veth_get_sset_count(struct net_device *dev, int sset)
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{
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switch (sset) {
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case ETH_SS_STATS:
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return ARRAY_SIZE(ethtool_stats_keys);
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default:
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return -EOPNOTSUPP;
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}
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}
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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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{
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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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}
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static u32 veth_get_rx_csum(struct net_device *dev)
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{
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struct veth_priv *priv;
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priv = netdev_priv(dev);
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return priv->ip_summed == CHECKSUM_UNNECESSARY;
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}
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static int veth_set_rx_csum(struct net_device *dev, u32 data)
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{
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struct veth_priv *priv;
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priv = netdev_priv(dev);
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priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
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return 0;
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}
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static u32 veth_get_tx_csum(struct net_device *dev)
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{
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return (dev->features & NETIF_F_NO_CSUM) != 0;
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}
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static int veth_set_tx_csum(struct net_device *dev, u32 data)
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{
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if (data)
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dev->features |= NETIF_F_NO_CSUM;
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else
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dev->features &= ~NETIF_F_NO_CSUM;
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return 0;
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}
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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_rx_csum = veth_get_rx_csum,
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.set_rx_csum = veth_set_rx_csum,
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.get_tx_csum = veth_get_tx_csum,
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.set_tx_csum = veth_set_tx_csum,
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.get_sg = ethtool_op_get_sg,
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.set_sg = ethtool_op_set_sg,
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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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};
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/*
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* xmit
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*/
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static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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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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int length;
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priv = netdev_priv(dev);
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rcv = priv->peer;
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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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if (!(rcv->flags & IFF_UP))
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goto tx_drop;
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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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skb->ip_summed = rcv_priv->ip_summed;
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length = skb->len + ETH_HLEN;
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if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
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goto rx_drop;
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stats->tx_bytes += length;
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stats->tx_packets++;
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rcv_stats->rx_bytes += length;
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rcv_stats->rx_packets++;
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return NETDEV_TX_OK;
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tx_drop:
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kfree_skb(skb);
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stats->tx_dropped++;
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return NETDEV_TX_OK;
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rx_drop:
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rcv_stats->rx_dropped++;
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return NETDEV_TX_OK;
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}
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/*
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* general routines
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*/
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static struct net_device_stats *veth_get_stats(struct net_device *dev)
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{
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struct veth_priv *priv;
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int cpu;
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struct veth_net_stats *stats, total = {0};
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priv = netdev_priv(dev);
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for_each_possible_cpu(cpu) {
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stats = per_cpu_ptr(priv->stats, cpu);
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total.rx_packets += stats->rx_packets;
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total.tx_packets += stats->tx_packets;
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total.rx_bytes += stats->rx_bytes;
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total.tx_bytes += stats->tx_bytes;
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total.tx_dropped += stats->tx_dropped;
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total.rx_dropped += stats->rx_dropped;
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}
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dev->stats.rx_packets = total.rx_packets;
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dev->stats.tx_packets = total.tx_packets;
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dev->stats.rx_bytes = total.rx_bytes;
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dev->stats.tx_bytes = total.tx_bytes;
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dev->stats.tx_dropped = total.tx_dropped;
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dev->stats.rx_dropped = total.rx_dropped;
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return &dev->stats;
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}
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static int veth_open(struct net_device *dev)
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{
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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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return -ENOTCONN;
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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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}
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return 0;
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}
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static int veth_close(struct net_device *dev)
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{
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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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return 0;
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}
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static int is_valid_veth_mtu(int new_mtu)
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{
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return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
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}
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static int veth_change_mtu(struct net_device *dev, int new_mtu)
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{
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if (!is_valid_veth_mtu(new_mtu))
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return -EINVAL;
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dev->mtu = new_mtu;
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return 0;
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}
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static int veth_dev_init(struct net_device *dev)
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{
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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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if (stats == NULL)
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return -ENOMEM;
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priv = netdev_priv(dev);
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priv->stats = stats;
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return 0;
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}
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static void veth_dev_free(struct net_device *dev)
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{
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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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free_netdev(dev);
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}
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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_stats = veth_get_stats,
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.ndo_set_mac_address = eth_mac_addr,
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};
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static void veth_setup(struct net_device *dev)
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{
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ether_setup(dev);
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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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}
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/*
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* netlink interface
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*/
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static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
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return -EINVAL;
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
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return -EADDRNOTAVAIL;
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}
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if (tb[IFLA_MTU]) {
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if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
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return -EINVAL;
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}
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return 0;
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}
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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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{
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int err;
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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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struct net *net;
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/*
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* create and register peer first
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*/
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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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ifla_policy);
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if (err < 0)
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return err;
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err = veth_validate(peer_tb, NULL);
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if (err < 0)
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return err;
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tbp = peer_tb;
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} else {
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ifmp = NULL;
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tbp = tb;
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}
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if (tbp[IFLA_IFNAME])
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nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
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else
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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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if (IS_ERR(net))
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return PTR_ERR(net);
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peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
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if (IS_ERR(peer)) {
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put_net(net);
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return PTR_ERR(peer);
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}
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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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put_net(net);
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net = NULL;
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if (err < 0)
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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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if (err < 0)
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goto err_configure_peer;
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/*
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* register dev last
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*
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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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*/
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if (tb[IFLA_ADDRESS] == NULL)
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random_ether_addr(dev->dev_addr);
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if (tb[IFLA_IFNAME])
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nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
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else
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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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if (err < 0)
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goto err_alloc_name;
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}
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err = register_netdevice(dev);
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if (err < 0)
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goto err_register_dev;
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netif_carrier_off(dev);
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/*
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* tie the deviced together
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*/
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priv = netdev_priv(dev);
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priv->peer = peer;
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priv = netdev_priv(peer);
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priv->peer = dev;
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return 0;
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err_register_dev:
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/* nothing to do */
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err_alloc_name:
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err_configure_peer:
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unregister_netdevice(peer);
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return err;
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err_register_peer:
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free_netdev(peer);
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return err;
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}
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static void veth_dellink(struct net_device *dev, struct list_head *head)
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{
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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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peer = priv->peer;
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unregister_netdevice_queue(dev, head);
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unregister_netdevice_queue(peer, head);
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}
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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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.kind = DRV_NAME,
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.priv_size = sizeof(struct veth_priv),
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.setup = veth_setup,
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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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};
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/*
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* init/fini
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*/
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static __init int veth_init(void)
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{
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return rtnl_link_register(&veth_link_ops);
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}
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static __exit void veth_exit(void)
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{
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rtnl_link_unregister(&veth_link_ops);
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}
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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);
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