code: func ParseProtocol(s string) Protocol {
  	switch strings.ToLower(s) {
  	case "icmp":
  		return ICMP
  	case "udp":
  		return UDP
  	case "tcp":
  		return TCP
  	case "sctp":
  		return SCTP
  	default:
  		return 0
  	}
  }
docs: // ParseProtocol returns the respective Protocol type for the passed string