Remove some unused winkernel arguments/fields/functions

The winkernel proxy was originally created by copying+pasting from the
iptables code, but some iptables-specific things were never removed
(and one function got left behind after its functionality was moved
into the shared proxy code).

cmd/kube-proxy/app/server_windows.go

@@ -111,8 +111,6 @@ func newProxyServer(config *proxyconfigapi.KubeProxyConfiguration, master string
 		proxier, err = winkernel.NewDualStackProxier(
 			config.IPTables.SyncPeriod.Duration,
 			config.IPTables.MinSyncPeriod.Duration,
-			config.IPTables.MasqueradeAll,
-			int(*config.IPTables.MasqueradeBit),
 			config.ClusterCIDR,
 			hostname,
 			nodeIPTuple(config.BindAddress),
@@ -125,8 +123,6 @@ func newProxyServer(config *proxyconfigapi.KubeProxyConfiguration, master string
 		proxier, err = winkernel.NewProxier(
 			config.IPTables.SyncPeriod.Duration,
 			config.IPTables.MinSyncPeriod.Duration,
-			config.IPTables.MasqueradeAll,
-			int(*config.IPTables.MasqueradeBit),
 			config.ClusterCIDR,
 			hostname,
 			nodeIP,

pkg/proxy/winkernel/proxier.go

@@ -33,7 +33,6 @@ import (
 	"github.com/Microsoft/hcsshim/hcn"
 	v1 "k8s.io/api/core/v1"
 	discovery "k8s.io/api/discovery/v1"
-	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/intstr"
 	apiutil "k8s.io/apimachinery/pkg/util/net"
 	"k8s.io/apimachinery/pkg/util/sets"
@@ -41,7 +40,6 @@ import (
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/tools/events"
 	"k8s.io/klog/v2"
-	"k8s.io/kubernetes/pkg/apis/core/v1/helper"
 	kubefeatures "k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/pkg/proxy"
 	"k8s.io/kubernetes/pkg/proxy/apis/config"
@@ -614,21 +612,14 @@ type Proxier struct {
 	initialized          int32
 	syncRunner           *async.BoundedFrequencyRunner // governs calls to syncProxyRules
 	// These are effectively const and do not need the mutex to be held.
-	masqueradeAll  bool
+	clusterCIDR string
-	masqueradeMark string
+	hostname    string
-	clusterCIDR    string
+	nodeIP      net.IP
-	hostname       string
+	recorder    events.EventRecorder
-	nodeIP         net.IP
-	recorder       events.EventRecorder
 
 	serviceHealthServer healthcheck.ServiceHealthServer
 	healthzServer       healthcheck.ProxierHealthUpdater
 
-	// Since converting probabilities (floats) to strings is expensive
-	// and we are using only probabilities in the format of 1/n, we are
-	// precomputing some number of those and cache for future reuse.
-	precomputedProbabilities []string
-
 	hns               HostNetworkService
 	network           hnsNetworkInfo
 	sourceVip         string
@@ -677,8 +668,6 @@ var _ proxy.Provider = &Proxier{}
 func NewProxier(
 	syncPeriod time.Duration,
 	minSyncPeriod time.Duration,
-	masqueradeAll bool,
-	masqueradeBit int,
 	clusterCIDR string,
 	hostname string,
 	nodeIP net.IP,
@@ -687,9 +676,6 @@ func NewProxier(
 	config config.KubeProxyWinkernelConfiguration,
 	healthzPort int,
 ) (*Proxier, error) {
-	masqueradeValue := 1 << uint(masqueradeBit)
-	masqueradeMark := fmt.Sprintf("%#08x/%#08x", masqueradeValue, masqueradeValue)
-
 	if nodeIP == nil {
 		klog.InfoS("Invalid nodeIP, initializing kube-proxy with 127.0.0.1 as nodeIP")
 		nodeIP = netutils.ParseIPSloppy("127.0.0.1")
@@ -783,8 +769,6 @@ func NewProxier(
 		endPointsRefCount:     make(endPointsReferenceCountMap),
 		svcPortMap:            make(proxy.ServicePortMap),
 		endpointsMap:          make(proxy.EndpointsMap),
-		masqueradeAll:         masqueradeAll,
-		masqueradeMark:        masqueradeMark,
 		clusterCIDR:           clusterCIDR,
 		hostname:              hostname,
 		nodeIP:                nodeIP,
@@ -822,8 +806,6 @@ func NewProxier(
 func NewDualStackProxier(
 	syncPeriod time.Duration,
 	minSyncPeriod time.Duration,
-	masqueradeAll bool,
-	masqueradeBit int,
 	clusterCIDR string,
 	hostname string,
 	nodeIP [2]net.IP,
@@ -834,14 +816,14 @@ func NewDualStackProxier(
 ) (proxy.Provider, error) {
 
 	// Create an ipv4 instance of the single-stack proxier
-	ipv4Proxier, err := NewProxier(syncPeriod, minSyncPeriod, masqueradeAll, masqueradeBit,
+	ipv4Proxier, err := NewProxier(syncPeriod, minSyncPeriod,
 		clusterCIDR, hostname, nodeIP[0], recorder, healthzServer, config, healthzPort)
 
 	if err != nil {
 		return nil, fmt.Errorf("unable to create ipv4 proxier: %v, hostname: %s, clusterCIDR : %s, nodeIP:%v", err, hostname, clusterCIDR, nodeIP[0])
 	}
 
-	ipv6Proxier, err := NewProxier(syncPeriod, minSyncPeriod, masqueradeAll, masqueradeBit,
+	ipv6Proxier, err := NewProxier(syncPeriod, minSyncPeriod,
 		clusterCIDR, hostname, nodeIP[1], recorder, healthzServer, config, healthzPort)
 	if err != nil {
 		return nil, fmt.Errorf("unable to create ipv6 proxier: %v, hostname: %s, clusterCIDR : %s, nodeIP:%v", err, hostname, clusterCIDR, nodeIP[1])
@@ -1034,20 +1016,6 @@ func (proxier *Proxier) OnServiceSynced() {
 	proxier.syncProxyRules()
 }
 
-func shouldSkipService(svcName types.NamespacedName, service *v1.Service) bool {
-	// if ClusterIP is "None" or empty, skip proxying
-	if !helper.IsServiceIPSet(service) {
-		klog.V(3).InfoS("Skipping service due to clusterIP", "serviceName", svcName, "clusterIP", service.Spec.ClusterIP)
-		return true
-	}
-	// Even if ClusterIP is set, ServiceTypeExternalName services don't get proxied
-	if service.Spec.Type == v1.ServiceTypeExternalName {
-		klog.V(3).InfoS("Skipping service due to Type=ExternalName", "serviceName", svcName)
-		return true
-	}
-	return false
-}
-
 // OnEndpointSliceAdd is called whenever creation of a new endpoint slice object
 // is observed.
 func (proxier *Proxier) OnEndpointSliceAdd(endpointSlice *discovery.EndpointSlice) {