Updating kube-proxy to support new EndpointSlice address types

This includes IPv4 and IPv6 address types and IPVS dual stack support.
Importantly this ensures that EndpointSlices with a FQDN address type
are not processed by kube-proxy.

pkg/proxy/endpoints_test.go

@@ -1431,6 +1431,9 @@ func TestLastChangeTriggerTime(t *testing.T) {
 }
 
 func TestEndpointSliceUpdate(t *testing.T) {
+	fqdnSlice := generateEndpointSlice("svc1", "ns1", 2, 5, 999, []string{"host1"}, []*int32{utilpointer.Int32Ptr(80), utilpointer.Int32Ptr(443)})
+	fqdnSlice.AddressType = discovery.AddressTypeFQDN
+
 	testCases := map[string]struct {
 		startingSlices        []*discovery.EndpointSlice
 		endpointChangeTracker *EndpointChangeTracker
@@ -1473,6 +1476,18 @@ func TestEndpointSliceUpdate(t *testing.T) {
 			expectedReturnVal:     false,
 			expectedCurrentChange: nil,
 		},
+		// ensure that only valide address types are processed
+		"add an FQDN slice (invalid address type)": {
+			startingSlices: []*discovery.EndpointSlice{
+				generateEndpointSlice("svc1", "ns1", 1, 3, 999, []string{"host1", "host2"}, []*int32{utilpointer.Int32Ptr(80), utilpointer.Int32Ptr(443)}),
+			},
+			endpointChangeTracker: NewEndpointChangeTracker("host1", nil, nil, nil, true),
+			namespacedName:        types.NamespacedName{Name: "svc1", Namespace: "ns1"},
+			paramEndpointSlice:    fqdnSlice,
+			paramRemoveSlice:      false,
+			expectedReturnVal:     false,
+			expectedCurrentChange: nil,
+		},
 		// test additions to existing state
 		"add a slice that overlaps with existing state": {
 			startingSlices: []*discovery.EndpointSlice{