diff options
Diffstat (limited to 'drivers/net/veth.c')
| -rw-r--r-- | drivers/net/veth.c | 482 |
1 files changed, 482 insertions, 0 deletions
diff --git a/drivers/net/veth.c b/drivers/net/veth.c new file mode 100644 index 00000000000..fdd1e034569 --- /dev/null +++ b/drivers/net/veth.c @@ -0,0 +1,482 @@ +/* + * 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_sset_count(struct net_device *dev, int sset) +{ + switch (sset) { + case ETH_SS_STATS: + return ARRAY_SIZE(ethtool_stats_keys); + default: + return -EOPNOTSUPP; + } +} + +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_sset_count = veth_get_sset_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(dev->nd_net, 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); |