Validate Service.Spec.publicIPs to be a valid IP that is not a localhost

pkg/util/validation.go

@@ -17,6 +17,7 @@ limitations under the License.
 package util
 
 import (
+	"net"
 	"regexp"
 )
 
@@ -94,3 +95,8 @@ func IsCIdentifier(value string) bool {
 func IsValidPortNum(port int) bool {
 	return 0 < port && port < 65536
 }
+
+// IsValidIP tests that the argument is a valid IPv4 address.
+func IsValidIP(value string) bool {
+	return net.ParseIP(value) != nil && net.ParseIP(value).To4() != nil
+}