// setupTapDevice creates persistent tap devices
// and returns a newly created netlink.Link structure
func setupTapDevice() (netlink.Link, error) {
ifName, err := tuntap.CreatePersistentIface(tuntap.Tap)
if err != nil {
return nil, fmt.Errorf("tuntap persist %v", err)
}
link, err := netlink.LinkByName(ifName)
if err != nil {
return nil, fmt.Errorf("cannot find link %q: %v", ifName, err)
}
err = netlink.LinkSetUp(link)
if err != nil {
return nil, fmt.Errorf("cannot set link up %q: %v", ifName, err)
}
return link, nil
}
// setupTapDevice creates persistent tap devices
// and returns a newly created netlink.Link structure
func setupTapDevice(podID types.UUID) (netlink.Link, error) {
// network device names are limited to 16 characters
// the suffix %d will be replaced by the kernel with a suitable number
nameTemplate := fmt.Sprintf("rkt-%s-tap%%d", podID.String()[0:4])
ifName, err := tuntap.CreatePersistentIface(nameTemplate, tuntap.Tap)
if err != nil {
return nil, fmt.Errorf("tuntap persist %v", err)
}
link, err := netlink.LinkByName(ifName)
if err != nil {
return nil, fmt.Errorf("cannot find link %q: %v", ifName, err)
}
err = netlink.LinkSetUp(link)
if err != nil {
return nil, fmt.Errorf("cannot set link up %q: %v", ifName, err)
}
return link, nil
}