type ChildDriver interface {
	// netmsg MAY be modified.
	// devName is like "tap" or "eth0"
	ConfigureNetworkChild(netmsg *common.NetworkMessage) (devName string, err error)
}

type ParentDriver interface {
	// MTU returns MTU
	MTU() int
	// ConfigureNetwork sets up Slirp, updates msg, and returns destructor function.
	ConfigureNetwork(childPID int, stateDir string) (netmsg *common.NetworkMessage, cleanup func() error, err error)
}