Wireshark-dev: Re: [Wireshark-dev] Patch: Prepare for some cleanups of 802.11ad
From: Richard Sharpe <[email protected]>
Date: Sat, 22 Aug 2015 17:08:24 -0700
On Sat, Aug 22, 2015 at 4:57 PM, Guy Harris <[email protected]> wrote:
>
> On Aug 22, 2015, at 2:30 PM, Guy Harris <[email protected]> wrote:
>
>> So software that reads radiotap captures and that cares about 11ad information needs to have a workaround wherein frames lacking a DMG field (which means "all frames", currently, as there isn't yet a DMG field) and having a channel frequency in the 11ad range have an 11ad PHY and, if they have MCS or VHT fields, ignore all items in those fields that don't apply to 11ad and *perhaps* interpret the MCS value in the MCS field as if it were an 11ad MCS value rather than an 11n MCS value.
>
> Note that Channel's presence bit index is 3, XChannel's is 18, MCS's is 19, and VHT's is 21, so by the time you see an MCS or VHT field you would already have the channel frequency (if it's present) and thus, if you see an MCS or VHT field, you would already know whether you have an 11ad frame and can process it appropriately.

I agree.

What I would like to do is take this a step at a time. I will update
the change to include the prototype DMG/802.11ad structure addition to
the phdr structure.

Once that is in for review I can come up with a patch to assemble that
information correctly and we can review it on the mailing list.

-- 
Regards,
Richard Sharpe
(何以解憂?唯有杜康。--曹操)