Re: [GNUnet-developers] [Battlemesh] wifibroadcast

[Simon Wunderlich]

On Friday, April 21, 2017 6:45:17 PM CEST Daniel Golle wrote:
> Hi!
> 
> On Fri, Apr 21, 2017 at 04:54:39PM +0200, Benjamin Henrion wrote:
> > Hi,
> > 
> > Just found this project, interesting ideas on using monitor mode:
> > 
> > https://befinitiv.wordpress.com/wifibroadcast-analog-like-transmission-of-> 
> > > live-video-data/
> > 
> > I think in the past I used adhoc inside monitor mode with aircrack-ng
> > if I remember.
> 
> Promissing indeed, because this might draw some attention to the need
> to provide the now missing TX rate control for injection.
> Hence this wifibroadcast project uses patched firmware and/or drivers
> to force transmission at a fixed bitrate -- it'd be much better if
> injection mode had a proper way for the transmitter to drive
> rate-control in software. Other projects (such as GNUnet...) would
> also greatly benefit from that...
> Having more wild groth (and even ugly things like firmware patches)
> does provide a good argument for having support for RADIOTAP_MCS,
> RADIOTAP_VHT, RADIOTAP_XChannel... in mac80211 also for TX injection.
> Previously setting the legacy bitrate (up to 54MBit/s single-stream
> with 20MHz channel width) was supported via the RADIOTAP_RATE header,
> but even that was dropped a long time ago...

Huh? I believe both RADIOTAP_MCS and RADIOTAP_RATE are supported fine, at least 
for ath9k. Not sure about other drivers, but I'm using it extensively on 
ath9k.

http://lxr.free-electrons.com/source/net/mac80211/tx.c#L1925

Cheers,
    Simon

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