RadioTap Archive on lore.kernel.org
 help / color / Atom feed
From: Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
To: Simon Barber <simon-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>,
	David Young <dyoung-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org>
Cc: radiotap-S783fYmB3Ccdnm+yROfE0A@public.gmane.org
Subject: Re: [RFC] capture file timestamping
Date: Thu, 17 Sep 2015 18:51:38 +0200
Message-ID: <1442508698.2821.16.camel@sipsolutions.net> (raw)
In-Reply-To: <55DE4244.9030407-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>

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:
> 
> https://github.com/parc-wifi/wireshark

> 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.

johannes

      parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-25 10:07 Johannes Berg
     [not found] ` <1440497229.2192.28.camel-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
2015-08-25 16:28   ` David Young
     [not found]     ` <20150825162841.GR6823-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org>
2015-08-25 16:46       ` Johannes Berg
     [not found]         ` <1440521168.2192.50.camel-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
2015-08-25 17:47           ` Guy Harris
     [not found]             ` <4E4FE63E-B636-4808-BBFF-6D2CE4EAFB2F-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
2015-08-25 17:55               ` Johannes Berg
2015-08-26 22:48           ` Simon Barber
     [not found]             ` <55DE4244.9030407-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2015-09-17 16:51               ` Johannes Berg [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1442508698.2821.16.camel@sipsolutions.net \
    --to=johannes-cdvu00un1vgdhxzaddlk8q@public.gmane.org \
    --cc=dyoung-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org \
    --cc=radiotap-S783fYmB3Ccdnm+yROfE0A@public.gmane.org \
    --cc=simon-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

RadioTap Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/radiotap/0 radiotap/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 radiotap radiotap/ https://lore.kernel.org/radiotap \
		radiotap@radiotap.org radiotap@archiver.kernel.org
	public-inbox-index radiotap

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.netbsd.radiotap


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git