This is a request for adoption of the MCS/HT information we've talked
about earlier, based on my second proposal that includes valid bits
within the field.

This proposal adds the following new field:

Bit Number: 19
Structure: u8 known, u8 flags, u8 mcs
Required Alignment: 1

The "mcs" field indicates the MCS rate index as in IEEE_802.11n-2009.

The "known" field indicates which flags are known:

0x01: bandwidth
0x02: MCS index known (in `mcs` part of the field)
0x04: guard interval
0x08: HT format
0x10: FEC type
0x20: a-MPDU status
0x40: a-MPDU beginning/end
0x80: reserved

The `flags` is any combination of the following:
0x03: bandwidth - 0: 20, 1: 40, 2: 20L, 3: 20U
0x04: short GI
0x08: 0: mixed, 1: greenfield
0x10: 0: BCC, 1: LDPC
0x20: a-MPDU status - 0: not part of an a-MPDU, 1: part of a-MPDU
0x40: 0: first frame, 1: last frame
0x80: reserved



Attached is a patch to Linux to generate this information (partially)
and a patch for wireshark to read it -- the wireshark patch is on top of
the refactoring I did in
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4421

johannes