Re: hostapd tries to send invalid mgmt frames at startup

On Saturday 16 May 2020 12:23:01 Jouni Malinen wrote:
> On Fri, May 15, 2020 at 11:32:55PM +0200, Johannes Berg wrote:
> > On Wed, 2020-05-13 at 11:40 +0200, Pali Rohár wrote:
> > > I have configured hostapd to provide multiple SSIDs at one phy
> > > interface. And on every hostapd startup I see in hostapd logs
> > > following errors:
> > > 
> > > May 13 09:20:30 turris hostapd: nl80211: Frame command failed: ret=-22 (Invalid argument) (freq=0 wait=0)
> > 
> > It's not *really* invalid, at least per spec. It's trying to send a
> > broadcast deauth frame for the new network it's about to start up.
> > 
> > But the kernel doesn't initialize all the context and everything until
> > it actually starts up, so it cannot do that yet and we get this result.
> > 
> > I believe it's been this way for many years, and the only side effect is
> > that print in the log ...
> 
> That's only one of these frames and not the particular one in this log.
> The ones here a Probe Response frames that were attempted to be sent
> during ACS channel survey since the driver managed to deliver Probe
> Request frames to hostapd for processing. I'm not completely sure how
> those frames could have passed the channel number validation check
> against DS parameters when the local configuration is still
> uninitialized (comparison against 0), but anyway, it looks like
> something happened here to allow that or the DS parameters was not used
> on the particular band. Anyway, I was able to reproduce this with
> mac80211_hwsim as well.
> 
> I'll make hostapd drop these Management frames that might be received
> during an ACS (or any other setup step before beaconing is started) to
> get rid of these attempts to send a Probe Response frame too early. I'll
> also move that broadcast Deauthentication frame so that it actually goes
> out with drivers using nl80211.

Thank you for looking at it. Could you send a link to git commit /
patch? I can try it on Turris MOX to check if problem is fixedI can try
it on Turris MOX to check if problem is fixed.

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