Re: Setting TX power on a monitoring interface

[Johannes Berg <johannes@sipsolutions.net>]

On Mon, 2017-11-27 at 16:07 +0100, Peter Große wrote:

> > I think if the driver has WANT_MONITOR_VIF, then we can pass that
> > through and let the driver sort it out.
> > 
> > But if not, we probably just have to reject the configuration?
> 
> With passing through you mean calling bss_info_changed on the driver for the
> monitor interface?

I meant to pass the &monitor_sdata.vif pointer instead of the real
monitor interface that's coming through cfg80211. The former is virtual
and has no netdev, but the diver is aware of it.

> Are monitor interfaces allowed to exist when WANT_MONITOR_VIF is not set?

Yes

> I ask, whether I would have to check 
>   sdata->vif.type == NL80211_IFTYPE_MONITOR
> _and_ also
>   ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)

You can check that

	local->monitor_sdata

exists, and use it if yes, and reject if no.

johannes