Class RadioTapTLV

scapy/layers/dot11.py:267–300

# This is still unimplemented in Wireshark
# https://www.radiotap.org/fields/TLV.html
class RadioTapTLV(Packet):
    fields_desc = [
        LEShortEnumField("type", 0, _rt_present),
        LEShortField("length", None),
        ConditionalField(
            OUIField("oui", 0),
            lambda pkt: pkt.type == 30  # VendorNS
        ),
        ConditionalField(
            ByteField("subtype", 0),
            lambda pkt: pkt.type == 30
        ),
        ConditionalField(
            LEShortField("presence_type", 0),
            lambda pkt: pkt.type == 30
        ),
        ConditionalField(
            LEShortField("reserved", 0),
            lambda pkt: pkt.type == 30
        ),
        StrLenField("data", b"",
                    length_from=lambda pkt: pkt.length),
        StrLenField("pad", None, length_from=lambda pkt: -pkt.length % 4)
    ]

    def post_build(self, pkt, pay):
        if self.length is None:
            pkt = pkt[:2] + struct.pack("<H", len(self.data)) + pkt[4:]
        if self.pad is None:
            pkt += b"\x00" * (-len(self.data) % 4)
        return pkt + pay

    def extract_padding(self, s):
        return "", s


# RADIOTAP