--- /dev/null
+/*
+ * 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/list.h>
+#include <linux/netdevice.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/veth.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;
+};
+
+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 int veth_get_stats_count(struct net_device *dev)
+{
+ return ARRAY_SIZE(ethtool_stats_keys);
+}
+
+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_stats_count = veth_get_stats_count,
+ .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->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;
+ skb->mark = 0;
+ 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 = &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_close(struct net_device *dev)
+{
+ struct veth_priv *priv;
+
+ if (netif_carrier_ok(dev)) {
+ priv = netdev_priv(dev);
+ netif_carrier_off(dev);
+ netif_carrier_off(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->stop = veth_close;
+ dev->ethtool_ops = &veth_ethtool_ops;
+ dev->features |= NETIF_F_LLTX;
+ dev->init = veth_dev_init;
+ dev->destructor = veth_dev_free;
+}
+
+/*
+ * 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;
+ }
+ return 0;
+}
+
+static struct rtnl_link_ops veth_link_ops;
+
+static int veth_newlink(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;
+
+ /*
+ * create and register peer first
+ *
+ * struct ifinfomsg is at the head of VETH_INFO_PEER, but we
+ * skip it since no info from it is useful yet
+ */
+
+ if (data != NULL && data[VETH_INFO_PEER] != NULL) {
+ struct nlattr *nla_peer;
+
+ nla_peer = data[VETH_INFO_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
+ tbp = tb;
+
+ if (tbp[IFLA_IFNAME])
+ nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
+ else
+ snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
+
+ peer = rtnl_create_link(ifname, &veth_link_ops, tbp);
+ if (IS_ERR(peer))
+ return PTR_ERR(peer);
+
+ if (tbp[IFLA_ADDRESS] == NULL)
+ random_ether_addr(peer->dev_addr);
+
+ err = register_netdevice(peer);
+ if (err < 0)
+ goto err_register_peer;
+
+ netif_carrier_off(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);
+
+ if (tb[IFLA_IFNAME])
+ nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
+ else
+ snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
+
+ if (strchr(dev->name, '%')) {
+ err = dev_alloc_name(dev, dev->name);
+ if (err < 0)
+ goto err_alloc_name;
+ }
+
+ err = register_netdevice(dev);
+ if (err < 0)
+ goto err_register_dev;
+
+ netif_carrier_off(dev);
+
+ /*
+ * tie the deviced together
+ */
+
+ priv = netdev_priv(dev);
+ priv->dev = dev;
+ priv->peer = peer;
+ list_add(&priv->list, &veth_list);
+
+ priv = netdev_priv(peer);
+ priv->dev = peer;
+ priv->peer = dev;
+ INIT_LIST_HEAD(&priv->list);
+ return 0;
+
+err_register_dev:
+ /* nothing to do */
+err_alloc_name:
+ unregister_netdevice(peer);
+ return err;
+
+err_register_peer:
+ free_netdev(peer);
+ 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);
+}
+
+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)
+{
+ struct veth_priv *priv, *next;
+
+ rtnl_lock();
+ /*
+ * cannot trust __rtnl_link_unregister() to unregister all
+ * devices, as each ->dellink call will remove two devices
+ * from the list at once.
+ */
+ list_for_each_entry_safe(priv, next, &veth_list, list)
+ veth_dellink(priv->dev);
+
+ __rtnl_link_unregister(&veth_link_ops);
+ rtnl_unlock();
+}
+
+module_init(veth_init);
+module_exit(veth_exit);
+
+MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_RTNL_LINK(DRV_NAME);
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff