From: Stanislaw Gruszka <sgruszka@redhat.com>
To: Bernd Edlinger <bernd.edlinger@hotmail.de>
Cc: Helmut Schaa <helmut.schaa@googlemail.com>,
Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>,
"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] rt61pci: Work around a firmware bug with shared keys
Date: Wed, 16 Jan 2019 12:21:30 +0100 [thread overview]
Message-ID: <20190116112129.GC5234@redhat.com> (raw)
In-Reply-To: <AM0PR07MB3874E8F6ADD41C4E1BCBE43EE4810@AM0PR07MB3874.eurprd07.prod.outlook.com>
On Tue, Jan 15, 2019 at 02:01:29PM +0000, Bernd Edlinger wrote:
> Apparently the rt2x61 firmware fails temporarily to decode
> broadcast packets if the shared keys are not assigned
> in the "correct" sequence. At the same time unicast
> packets work fine, since they are encrypted with the
> pairwise key.
>
> At least with WPA2 CCMP mode the shared keys are
> set in the following sequence: keyidx=1, 2, 1, 2.
> After a while only keyidx 2 gets decrypted, and
> keyidx 1 is ignored, probably because there is never
> a keyidx 3.
>
> Symptoms are arping -b works for 10 minutes, since
> keyidx=2 is used for broadcast, and then it stops
> working for 10 minutes, because keyidx=1 is used.
> That failure mode repeats forever.
>
> Note, the firmware does not even know which keyidx
> corresponds to which hw_key_idx so the firmware is
> trying to be smarter than the driver, which is bound
> to fail.
>
> As workaround the function rt61pci_config_shared_key
> requests software decryption of the shared keys,
> by returning EOPNOTSUPP. However, pairwise keys are
> still handled by hardware which works just fine.
>
> Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>
next prev parent reply other threads:[~2019-01-16 11:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-15 14:01 [PATCH] rt61pci: Work around a firmware bug with shared keys Bernd Edlinger
2019-01-16 11:21 ` Stanislaw Gruszka [this message]
2019-01-16 16:29 ` Kalle Valo
2019-02-01 12:16 ` [PATCH] rt2x00: " Kalle Valo
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