package conntypes type ConnectionProtocol uint8 func (c ConnectionProtocol) String() string { switch c { case ConnectionProtocolAny: return "any" case ConnectionProtocolIPv4: return "ipv4" } return "ipv6" } const ( ConnectionProtocolIPv4 ConnectionProtocol = 1 ConnectionProtocolIPv6 = ConnectionProtocolIPv4 << 1 ConnectionProtocolAny = ConnectionProtocolIPv4 | ConnectionProtocolIPv6 )