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From: Johannes Berg <>
To: Simon Barber <>,
	David Young <>
Subject: Re: [RFC] capture file timestamping
Date: Thu, 17 Sep 2015 18:51:38 +0200
Message-ID: <> (raw)
In-Reply-To: <>

On Wed, 2015-08-26 at 15:48 -0700, Simon Barber wrote:
> This is exactly what I was doing when I ran into the current TSFT 
> field limitations a few years ago. 

Right, I vaguely remembered that, hence the CC :)

> GPL code is here:

> I'm working on getting this updated for 11ac now, so revisiting some 
> of the same issues.

Ah, that's really nice! I really needed something like this the other
day, will check it out.

> The HT and VHT headers in radiotap are incomplete, and would be much 
> nicer if they could just include the signal field from the plcp 
> (perhaps with a mask to indicate parts that are missing). This would 
> be a better approach for 60GHz I think.

Yeah, can't really object to that, even if we might not be able to
provide all the data for all the hardware, and might have to re
-assemble the field from the available parsed data.

As far as our device is concerned we might perhaps be able to include
this data in firmware's monitor mode.

> I'd like to display the L-SIG txop protection on the timeline as 
> well.

Good idea.

As far as the timestamp is concerned though, what would you suggest?

Also, what timestamp would be best for a tool like yours? I'm assuming
ours, which is the signal detection timestamp and inherently vague by
perhaps a dozen microseconds won't really work that well.


      parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-25 10:07 Johannes Berg
     [not found] ` <>
2015-08-25 16:28   ` David Young
     [not found]     ` <>
2015-08-25 16:46       ` Johannes Berg
     [not found]         ` <>
2015-08-25 17:47           ` Guy Harris
     [not found]             ` <4E4FE63E-B636-4808-BBFF-6D2CE4EAFB2F-FrUbXkNCsVf2fBVCVOL8/>
2015-08-25 17:55               ` Johannes Berg
2015-08-26 22:48           ` Simon Barber
     [not found]             ` <>
2015-09-17 16:51               ` Johannes Berg [this message]

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