linux/drivers/net/veth.c
Eric W. Biederman 81adee47df net: Support specifying the network namespace upon device creation.
There is no good reason to not support userspace specifying the
network namespace during device creation, and it makes it easier
to create a network device and pass it to a child network namespace
with a well known name.

We have to be careful to ensure that the target network namespace
for the new device exists through the life of the call.  To keep
that logic clear I have factored out the network namespace grabbing
logic into rtnl_link_get_net.

In addtion we need to continue to pass the source network namespace
to the rtnl_link_ops.newlink method so that we can find the base
device source network namespace.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
2009-11-08 00:53:51 -08:00

498 lines
10 KiB
C

/*
* 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/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <net/dst.h>
#include <net/xfrm.h>
#include <linux/veth.h>
#define DRV_NAME "veth"
#define DRV_VERSION "1.0"
#define MIN_MTU 68 /* Min L3 MTU */
#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
#define MTU_PAD (ETH_HLEN + 4) /* Max difference between L2 and L3 size MTU */
struct veth_net_stats {
unsigned long rx_packets;
unsigned long tx_packets;
unsigned long rx_bytes;
unsigned long tx_bytes;
unsigned long tx_dropped;
unsigned long rx_dropped;
};
struct veth_priv {
struct net_device *peer;
struct veth_net_stats *stats;
unsigned ip_summed;
};
/*
* 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, &ethtool_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 const 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 netdev_tx_t 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, *rcv_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);
rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu);
if (!(rcv->flags & IFF_UP))
goto tx_drop;
if (skb->len > (rcv->mtu + MTU_PAD))
goto rx_drop;
skb->tstamp.tv64 = 0;
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;
skb->mark = 0;
secpath_reset(skb);
nf_reset(skb);
length = skb->len;
stats->tx_bytes += length;
stats->tx_packets++;
rcv_stats->rx_bytes += length;
rcv_stats->rx_packets++;
netif_rx(skb);
return NETDEV_TX_OK;
tx_drop:
kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
rx_drop:
kfree_skb(skb);
rcv_stats->rx_dropped++;
return NETDEV_TX_OK;
}
/*
* 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;
dev_stats->rx_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;
dev_stats->rx_dropped += stats->rx_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 = netdev_priv(dev);
netif_carrier_off(dev);
netif_carrier_off(priv->peer);
return 0;
}
static int is_valid_veth_mtu(int new_mtu)
{
return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU);
}
static int veth_change_mtu(struct net_device *dev, int new_mtu)
{
if (!is_valid_veth_mtu(new_mtu))
return -EINVAL;
dev->mtu = new_mtu;
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 const struct net_device_ops veth_netdev_ops = {
.ndo_init = veth_dev_init,
.ndo_open = veth_open,
.ndo_stop = veth_close,
.ndo_start_xmit = veth_xmit,
.ndo_change_mtu = veth_change_mtu,
.ndo_get_stats = veth_get_stats,
.ndo_set_mac_address = eth_mac_addr,
};
static void veth_setup(struct net_device *dev)
{
ether_setup(dev);
dev->netdev_ops = &veth_netdev_ops;
dev->ethtool_ops = &veth_ethtool_ops;
dev->features |= NETIF_F_LLTX;
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;
}
if (tb[IFLA_MTU]) {
if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
return -EINVAL;
}
return 0;
}
static struct rtnl_link_ops veth_link_ops;
static int veth_newlink(struct net *src_net, 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;
struct net *net;
/*
* 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");
net = rtnl_link_get_net(src_net, tbp);
if (IS_ERR(net))
return PTR_ERR(net);
peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
if (IS_ERR(peer)) {
put_net(net);
return PTR_ERR(peer);
}
if (tbp[IFLA_ADDRESS] == NULL)
random_ether_addr(peer->dev_addr);
err = register_netdevice(peer);
put_net(net);
net = NULL;
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->peer = peer;
priv = netdev_priv(peer);
priv->peer = dev;
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 list_head *head)
{
struct veth_priv *priv;
struct net_device *peer;
priv = netdev_priv(dev);
peer = priv->peer;
unregister_netdevice_queue(dev, head);
unregister_netdevice_queue(peer, head);
}
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)
{
rtnl_link_unregister(&veth_link_ops);
}
module_init(veth_init);
module_exit(veth_exit);
MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_RTNL_LINK(DRV_NAME);