type HostPortManager interface {
    // Add implements port mappings.
    // id should be a unique identifier for a pod, e.g. podSandboxID.
    // podPortMapping is the associated port mapping information for the pod.
    // natInterfaceName is the interface that localhost used to talk to the given pod.
    Add(id string, podPortMapping *PodPortMapping, natInterfaceName string) error
    // Remove cleans up matching port mappings
    // Remove must be able to clean up port mappings without pod IP
    Remove(id string, podPortMapping *PodPortMapping) error
}

type HostportSyncer interface {
    // SyncHostports gathers all hostports on node and setup iptables rules to enable them.
    // On each invocation existing ports are synced and stale rules are deleted.
    SyncHostports(natInterfaceName string, activePodPortMappings []*PodPortMapping) error
    // OpenPodHostportsAndSync opens hostports for a new PodPortMapping, gathers all hostports on
    // node, sets up iptables rules enable them. On each invocation existing ports are synced and stale rules are deleted.
    // 'newPortMapping' must also be present in 'activePodPortMappings'.
    OpenPodHostportsAndSync(newPortMapping *PodPortMapping, natInterfaceName string, activePodPortMappings []*PodPortMapping) error
}

type PodPortMapping struct {
    Namespace    string
    Name         string
    PortMappings []*PortMapping
    HostNetwork  bool
    IP           net.IP
}

type PortMapping struct {
    Name          string
    HostPort      int32
    ContainerPort int32
    Protocol      v1.Protocol
    HostIP        string
}