netdev - Re: [PATCH v2] Set ssid when authenticating

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Message-ID: <5a1d1244c8d3e20408732858442f264d26cc2768.camel@sipsolutions.net>
Date:   Mon, 13 Feb 2023 12:01:43 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Marc Bornand <dev.mbornand@...temb.ch>,
        linux-wireless@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kalle Valo <kvalo@...nel.org>,
        Yohan Prod'homme <kernel@...do.fr>, stable@...r.kernel.org
Subject: Re: [PATCH v2] Set ssid when authenticating

On Mon, 2023-02-13 at 10:55 +0000, Marc Bornand wrote:
> changes since v1:
> - add some informations
> - test it on wireless-2023-01-18 tag
> - no real code change
> 
> When a connexion was established without going through
> NL80211_CMD_CONNECT, the ssid was never set in the wireless_dev struct.
> Now we set it during when an NL80211_CMD_AUTHENTICATE is issued.

This is incorrect, doing an authentication doesn't require doing an
association afterwards, and doesn't necessarily imply any state change
in the kernel.

> alternatives:
> 1. Do the same but during association and not authentication.

Which should probably be done _after_ successful authentication, even in
the CONNECT command case, which currently does it in cfg80211_connect()
but I guess that should move to __cfg80211_connect_result().

> 2. use ieee80211_bss_get_elem in nl80211_send_iface, this would report
>    the right ssid to userspace, but this would not fix the root cause,
>    this alos wa the behavior prior to 7b0a0e3c3a882 when the bug was
>    introduced.

That would be OK too but the reason I changed it there (missing the fact
that it wasn't set) is that we have multiple BSSes with MLO. So it's
hard to get one to do this with.

johannes