[PATCH RFC] wpa_s: use proper channel to send SAE AUTH frames

Jouni Malinen j at w1.fi
Sun Apr 14 02:46:17 PDT 2019


On Wed, Apr 10, 2019 at 03:00:16PM +0000, Sergey Matyukevich wrote:
> SAE connection fails if CSA occured during any previous connection
> since the start of current wpa_supplicant runtime.
> 
> The root cause is as follows. If STA channel changes due to CSA,
> then bss->freq is updated in mlme_event_ch_switch. However this
> value is not cleared between connections. So later it will be
> used during SAE AUTH frame exchange.

I'd guess this is referring to use of SAE authentication offload or some
other special case since I don't see how bss->freq would have an impact
of SAE authentication when using NL80211_CMD_AUTHENTICATE.

> By the way, it looks like cleaning up bss->freq field would be a better
> option. But so far I could not figure out a good place for this kind of
> cleanup. Any suggestions are welcome.

Yeah, I think I'll rather do that and also update bss->freq in station
mode after association. Setting drv->first_bss->freq to 0 in
nl80211_mark_disconnect() is likely going to handle most, if not all,
the needed cases. If that does not fix this for your case, please share
a wpa_supplicant debug log showing the exact sequence in which bss->freq
ends up getting used to select incorrect channel for SAE authentication
frames.

-- 
Jouni Malinen                                            PGP id EFC895FA



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