kubernetes/pkg/controlplane/controller/defaultservicecidr/default_servicecidr_controller.go

const controllerName …

const DefaultServiceCIDRName …

// NewController returns a new *Controller that generates the default ServiceCIDR
// from the `--service-cluster-ip-range` flag and recreates it if necessary,
// but doesn't update it if is different.
// It follows the same logic that the kubernetes.default Service.
func NewController(
	primaryRange net.IPNet,
	secondaryRange net.IPNet,
	client clientset.Interface,
) *Controller { … }

type Controller …

// Start will not return until the default ServiceCIDR exists or stopCh is closed.
func (c *Controller) Start(ctx context.Context) { … }

func (c *Controller) sync() error { … }

func (c *Controller) syncStatus(serviceCIDR *networkingapiv1beta1.ServiceCIDR) { … }