--- /dev/null
+/*
+ * drivers/net/veth.c
+ *
+ * Copyright (C) 2007, 2009 OpenVZ http://openvz.org, SWsoft Inc
+ *
+ * Author: Pavel Emelianov <xemul@openvz.org>
+ * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
+ *
+ */
+
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+
+#include <net/dst.h>
+#include <net/xfrm.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 net_device *dev;
+ struct list_head list;
+ struct veth_net_stats *stats;
+ unsigned ip_summed;
+ struct net_device_stats dev_stats;
+};
+
+static LIST_HEAD(veth_list);
+
+/*
+ * 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, ðtool_stats_keys, sizeof(ethtool_stats_keys));
+ break;
+ }
+}
+
+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_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->dev = rcv;
+ 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;
+ 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 = &priv->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 void veth_setup(struct net_device *dev)
+{
+ ether_setup(dev);
+
+ dev->hard_start_xmit = veth_xmit;
+ dev->get_stats = veth_get_stats;
+ dev->open = veth_open;
+ dev->ethtool_ops = &veth_ethtool_ops;
+ dev->features |= NETIF_F_LLTX;
+ dev->init = veth_dev_init;
+ 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->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_newlink(const char *devname, const char *peername)
+{
+ int err;
+ const char *names[2];
+ struct net_device *devs[2];
+ int i;
+
+ names[0] = devname;
+ names[1] = peername;
+ devs[0] = devs[1] = NULL;
+
+ for (i = 0; i < 2; i++) {
+ struct net_device *dev;
+
+ err = -ENOMEM;
+ devs[i] = alloc_netdev(sizeof(struct veth_priv),
+ names[i], veth_setup);
+ if (!devs[i]) {
+ goto err;
+ }
+
+ dev = devs[i];
+
+ if (strchr(dev->name, '%')) {
+ err = dev_alloc_name(dev, dev->name);
+ if (err < 0)
+ goto err;
+ }
+ random_ether_addr(dev->dev_addr);
+
+ err = register_netdevice(dev);
+ if (err < 0)
+ goto err;
+
+ netif_carrier_off(dev);
+ }
+
+ /*
+ * tie the devices together
+ */
+
+ for (i = 0; i < 2; i++) {
+ struct veth_priv *priv = netdev_priv(devs[i]);
+ priv->dev = devs[i];
+ priv->peer = devs[!i];
+ if (!i)
+ list_add(&priv->list, &veth_list);
+ else
+ INIT_LIST_HEAD(&priv->list);
+ }
+ return 0;
+
+err:
+ for (i = 0; i < 2; i++) {
+ if (devs[i]) {
+ if (devs[i]->reg_state != NETREG_UNINITIALIZED)
+ unregister_netdevice(devs[i]);
+ else
+ free_netdev(devs[i]);
+ }
+ }
+ 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;
+
+ if (!list_empty(&priv->list))
+ list_del(&priv->list);
+
+ priv = netdev_priv(peer);
+ if (!list_empty(&priv->list))
+ list_del(&priv->list);
+
+ unregister_netdevice(dev);
+ unregister_netdevice(peer);
+}
+
+/*
+ * sysfs
+ */
+
+/*
+ * "show" function for the veth_pairs attribute.
+ * The class parameter is ignored.
+ */
+static ssize_t veth_show_veth_pairs(struct class *cls, char *buffer)
+{
+ int res = 0;
+ struct veth_priv *priv;
+
+ list_for_each_entry(priv, &veth_list, list) {
+ if (res > (PAGE_SIZE - (IFNAMSIZ * 2 + 1))) {
+ /* not enough space for another interface name */
+ if ((PAGE_SIZE - res) > 10)
+ res = PAGE_SIZE - 10;
+ res += sprintf(buffer + res, "++more++");
+ break;
+ }
+ res += sprintf(buffer + res, "%s,%s ",
+ priv->dev->name, priv->peer->name);
+ }
+ res += sprintf(buffer + res, "\n");
+ res++;
+ return res;
+}
+
+/*
+ * "store" function for the veth_pairs attribute. This is what
+ * creates and deletes veth pairs.
+ *
+ * The class parameter is ignored.
+ *
+ */
+static ssize_t veth_store_veth_pairs(struct class *cls, const char *buffer,
+ size_t count)
+{
+ int c = *buffer++;
+ int retval;
+ printk("1\n");
+ if (c == '+') {
+ char devname[IFNAMSIZ + 1] = "";
+ char peername[IFNAMSIZ + 1] = "";
+ char *comma = strchr(buffer, ',');
+ printk("2\n");
+ if (!comma)
+ goto err_no_cmd;
+ strncat(devname, buffer,
+ min_t(int, sizeof devname, comma - buffer));
+ strncat(peername, comma + 1,
+ min_t(int, sizeof peername, strcspn(comma + 1, "\n")));
+ printk("3 '%s' '%s'\n", devname, peername);
+ if (!dev_valid_name(devname) || !dev_valid_name(peername))
+ goto err_no_cmd;
+ printk("4\n");
+ rtnl_lock();
+ retval = veth_newlink(devname, peername);
+ rtnl_unlock();
+ return retval ? retval : count;
+ } else if (c == '-') {
+ struct net_device *dev;
+
+ rtnl_lock();
+ dev = dev_get_by_name(buffer);
+ if (!dev)
+ retval = -ENODEV;
+ else if (dev->init != veth_dev_init)
+ retval = -EINVAL;
+ else {
+ veth_dellink(dev);
+ retval = count;
+ }
+ rtnl_unlock();
+
+ return retval;
+ }
+
+err_no_cmd:
+ printk(KERN_ERR DRV_NAME ": no command found in veth_pairs. Use +ifname,peername or -ifname.\n");
+ return -EPERM;
+}
+
+/* class attribute for veth_pairs file. This ends up in /sys/class/net */
+static CLASS_ATTR(veth_pairs, S_IWUSR | S_IRUGO,
+ veth_show_veth_pairs, veth_store_veth_pairs);
+
+static struct class *netdev_class;
+
+/*
+ * Initialize sysfs. This sets up the veth_pairs file in
+ * /sys/class/net.
+ */
+int veth_create_sysfs(void)
+{
+ struct net_device *dev = dev_get_by_name("lo");
+ if (!dev)
+ return -ESRCH;
+ netdev_class = dev->class_dev.class;
+ if (!netdev_class)
+ return -ENODEV;
+
+ return class_create_file(netdev_class, &class_attr_veth_pairs);
+}
+
+/*
+ * Remove /sys/class/net/veth_pairs.
+ */
+void veth_destroy_sysfs(void)
+{
+ class_remove_file(netdev_class, &class_attr_veth_pairs);
+}
+
+
+
+/*
+ * init/fini
+ */
+
+static __init int veth_init(void)
+{
+ int retval = veth_create_sysfs();
+ if (retval)
+ return retval;
+ register_netdevice_notifier(&veth_notifier_block);
+ return 0;
+}
+
+static __exit void veth_exit(void)
+{
+ unregister_netdevice_notifier(&veth_notifier_block);
+}
+
+module_init(veth_init);
+module_exit(veth_exit);
+
+MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
+MODULE_LICENSE("GPL v2");
projects / openvswitch / commitdiff