linux-kernel - Re: [PATCH] wifi: brcmfmac: cfg80211: Use WSEC to set SAE password

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Message-ID: <CAGRGNgW0h_uqHn0rKwGx0L41R+YgzgWPEh83kSKVCeqfCDeOug@mail.gmail.com>
Date: Wed, 20 Dec 2023 01:26:30 +1100
From: Julian Calaby <julian.calaby@...il.com>
To: Arend van Spriel <arend.vanspriel@...adcom.com>, Kalle Valo <kvalo@...nel.org>
Cc: Hector Martin <marcan@...can.st>, Arend van Spriel <aspriel@...il.com>, 
	Franky Lin <franky.lin@...adcom.com>, Hante Meuleman <hante.meuleman@...adcom.com>, 
	Daniel Berlin <dberlin@...rlin.org>, linux-wireless@...r.kernel.org, 
	brcm80211-dev-list.pdl@...adcom.com, SHA-cyfmac-dev-list@...ineon.com, 
	linux-kernel@...r.kernel.org, asahi@...ts.linux.dev
Subject: Re: [PATCH] wifi: brcmfmac: cfg80211: Use WSEC to set SAE password

Hi Arend and Kalle,

On Wed, Dec 20, 2023 at 12:47 AM Arend van Spriel
<arend.vanspriel@...adcom.com> wrote:
>
> On 12/19/2023 12:01 PM, Hector Martin wrote:
> >
> >
> > On 2023/12/19 17:52, Arend Van Spriel wrote:
> >> On December 17, 2023 12:25:23 PM Kalle Valo <kvalo@...nel.org> wrote:
> >>
> >>> Hector Martin <marcan@...can.st> wrote:
> >>>
> >>>> Using the WSEC command instead of sae_password seems to be the supported
> >>>> mechanism on newer firmware, and also how the brcmdhd driver does it.
> >>>>
> >>>> According to user reports [1], the sae_password codepath doesn't actually
> >>>> work on machines with Cypress chips anyway, so no harm in removing it.
> >>>>
> >>>> This makes WPA3 work with iwd, or with wpa_supplicant pending a support
> >>>> patchset [2].
> >>>>
> >>>> [1] https://rachelbythebay.com/w/2023/11/06/wpa3/
> >>>> [2] http://lists.infradead.org/pipermail/hostap/2023-July/041653.html
> >>>>
> >>>> Signed-off-by: Hector Martin <marcan@...can.st>
> >>>> Reviewed-by: Neal Gompa <neal@...pa.dev>
> >>>
> >>> Arend, what do you think?
> >>>
> >>> We recently talked about people testing brcmfmac patches, has anyone else
> >>> tested this?
> >>
> >> Not sure I already replied so maybe I am repeating myself. I would prefer
> >> to keep the Cypress sae_password path as well although it reportedly does
> >> not work. The vendor support in the driver can be used to accommodate for
> >> that. The other option would be to have people with Cypress chipset test
> >> this patch. If that works for both we can consider dropping the
> >> sae_password path.
> >>
> >> Regards,
> >> Arend
> >
> > So, if nobody from Cypress chimes in ever, and nobody cares nor tests
> > Cypress chipsets, are we keeping any and all existing Cypress code-paths
> > as bitrotting code forever and adding gratuitous conditionals every time
> > any functionality needs to change "just in case it breaks Cypress" even
> > though it has been tested compatible on Broadcom chipsets/firmware?
> >
> > Because that's not sustainable long term.
>
> You should look into WEXT just for the fun of it. If it were up to me
> and a bunch of other people that would have been gone decades ago. Maybe
> a bad example if the sae_password is indeed not working, but the Cypress
> chipset is used in RPi3 and RPi4 so there must be a couple of users.

There are reports that WPA3 is broken on the Cypress chipsets the
Raspberry Pis are using and this patch fixes it:
https://rachelbythebay.com/w/2023/11/06/wpa3/

Based on that, it appears that all known users of WPA3 capable
hardware with this driver require this fix.

Thanks,

-- 
Julian Calaby

Email: julian.calaby@...il.com
Profile: http://www.google.com/profiles/julian.calaby/