func SetHairpinMode(name string, enabled bool) error {
iface, err := net.InterfaceByName(name)
if err != nil {
return err
}
return netlink.SetHairpinMode(iface, enabled)
}
// attach a container network interface to an external network
func (v *veth) attach(n *configs.Network) (err error) {
bridge, err := net.InterfaceByName(n.Bridge)
if err != nil {
return err
}
host, err := net.InterfaceByName(n.HostInterfaceName)
if err != nil {
return err
}
if err := netlink.AddToBridge(host, bridge); err != nil {
return err
}
if err := netlink.NetworkSetMTU(host, n.Mtu); err != nil {
return err
}
if n.HairpinMode {
if err := netlink.SetHairpinMode(host, true); err != nil {
return err
}
}
if err := netlink.NetworkLinkUp(host); err != nil {
return err
}
return nil
}
func (v *veth) create(n *network, nspid int) (err error) {
tmpName, err := v.generateTempPeerName()
if err != nil {
return err
}
n.TempVethPeerName = tmpName
defer func() {
if err != nil {
netlink.NetworkLinkDel(n.HostInterfaceName)
netlink.NetworkLinkDel(n.TempVethPeerName)
}
}()
if n.Bridge == "" {
return fmt.Errorf("bridge is not specified")
}
bridge, err := net.InterfaceByName(n.Bridge)
if err != nil {
return err
}
if err := netlink.NetworkCreateVethPair(n.HostInterfaceName, n.TempVethPeerName, n.TxQueueLen); err != nil {
return err
}
host, err := net.InterfaceByName(n.HostInterfaceName)
if err != nil {
return err
}
if err := netlink.AddToBridge(host, bridge); err != nil {
return err
}
if err := netlink.NetworkSetMTU(host, n.Mtu); err != nil {
return err
}
if n.HairpinMode {
if err := netlink.SetHairpinMode(host, true); err != nil {
return err
}
}
if err := netlink.NetworkLinkUp(host); err != nil {
return err
}
child, err := net.InterfaceByName(n.TempVethPeerName)
if err != nil {
return err
}
return netlink.NetworkSetNsPid(child, nspid)
}