func configureIface(ifname string, ipn ip.IP4Net, mtu int) error {
iface, err := net.InterfaceByName(ifname)
if err != nil {
log.Error("Failed to lookup interface ", ifname)
return err
}
n := ipn.ToIPNet()
err = netlink.NetworkLinkAddIp(iface, n.IP, n)
if err != nil {
log.Errorf("Failed to add IP address %s to %s: %s", n.IP, ifname, err)
return err
}
err = netlink.NetworkSetMTU(iface, mtu)
if err != nil {
log.Errorf("Failed to set MTU for %s: %v", ifname, err)
return err
}
err = netlink.NetworkLinkUp(iface)
if err != nil {
log.Errorf("Failed to set interface %s to UP state: %s", ifname, err)
return err
}
// explicitly add a route since there might be a route for a subnet already
// installed by Docker and then it won't get auto added
err = netlink.AddRoute(ipn.Network().String(), "", "", ifname)
if err != nil && err != syscall.EEXIST {
log.Errorf("Failed to add route (%s -> %s): %v", ipn.Network().String(), ifname, err)
return err
}
return nil
}
