Radiotap header for S1G captures and associated changes and other definitions

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Hi folks,

This is a second attempt at a RADIOTAP header for S1G captures.

Aaron Lee did the work in creating these definitions. I simply transcribed =
them.

The attached patch defines changes to the Channel field, 0-length-MPDU
field and a new S1G field.

There is also and associated definition for S1G NPD frames, which are
40-bit non-MAC frames transmitted by S1G STAs. I have included the
definition of those in this email, and they are essentially from
802.11ah-2016 with a little bit of helpful framing.

1. Channel field:

3 new values for Mask: 0x0002 for 700 MHz, 0x0004 for 800 MHz and
0x0008 for 900 MHz spectrum channels respectively.

2. 0-length MPDU field:

1 new value: 0x02 in the type value: 2 indicates that an S1G NDP
40-bit frame follows.

Note, this seems weird. Maybe the name of the field needs changing to
non-MAC frame or something.

3. The new S1G frame.

It consists of three 16-bit fields:

U16 known, U16 data1, U16 data2

Known:
0x0001 S1G PPDU format known
0x0002 Response indication known
0x0004 Guard Interval known
0x0008 NSS known
0x0010 Bandwidth known
0x0020 MCS Known
0x0040 Color known
0xFF80 Reserved

Data1:
0x0003: S1G PPDU Format: 0=3DS1G_1M, 1=3DS1G_SHORT, 2=3DS1G_LONG
0x000C: Response indication: 0=3DNO_RESPONSE, 1=3DNDP_RESPONSE,
2=3DNORMAL_RESPONSE, 3=3DLONG_RESPPNSE
0x0010: Reserved
0x0020: Guard interval: 0=3DLong GI, 1=3DShort GI
0x00C0: Number spatial streams: 0=3D1 Spatial stream, 1=3D2, .. 3=3D4 Spati=
al streams
0x0F00: Bandwidth: 0=3D1MHz, 1=3D2MHz, 2=3D4MHz, 3=3D8MHz, 4=3D16MHz, 5-15 =
reserved
0xF000:  MCS (MCS rate index, 0-10, 11-15 reserved)

Data2:
0x000F: Color: 0-7
0xFFF0: Reserved

The S1G NPD format is essentially from section 9.9 of 802.11ah-2016
with some additional syntactic sugar:

It is a 40-bit field.

The first 8 bits distinguishes between Management and Control frames
using the values 0x0F (management) and 0x20 (control).

The last two bits indicates the bandwidth, between 1MHz and 2MHz,

In between, a 1MHz NDP CMAC frame contains 26 used bits and 13 unused
bits. The used bits are defined in section 9.9 of 802.11ah-2016. A
1MHz NDP CMAC frame contains 37 used bits and one unused bit. Again,
the used bits are defined in 802.11ah-2016.

--=20
Regards,
Richard Sharpe
(=E4=BD=95=E4=BB=A5=E8=A7=A3=E6=86=82=EF=BC=9F=E5=94=AF=E6=9C=89=E6=9D=9C=
=E5=BA=B7=E3=80=82--=E6=9B=B9=E6=93=8D)(=E4=BC=A0=E8=AF=B4=E6=9D=9C=E5=BA=
=B7=E6=98=AF=E9=85=92=E7=9A=84=E5=8F=91=E6=98=8E=E8=80=85)

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