code: func validateProtocol(protocol string) bool {
  	if protocol == ProtocolTCP || protocol == ProtocolUDP || protocol == ProtocolSCTP {
  		return true
  	}
  	klog.Errorf("Invalid entry's protocol: %s, supported protocols are [%s, %s, %s]", protocol, ProtocolTCP, ProtocolUDP, ProtocolSCTP)
  	return false
  }
docs: // checks if given protocol is supported in entry