From: Johannes Berg <johannes@sipsolutions.net>
To: Emmanuel Grumbach <egrumbach@gmail.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>
Subject: Re: mac80211 drops packet with old IV after rekeying
Date: Fri, 15 May 2015 20:35:49 +0200 [thread overview]
Message-ID: <1431714949.2117.0.camel@sipsolutions.net> (raw)
In-Reply-To: <CANUX_P0HN5z-c6M_KcnJxT1LBPDP=OC9JnsaPPRf9RcDuw4hug@mail.gmail.com> (sfid-20150515_095254_231754_1FF752D2)
On Fri, 2015-05-15 at 10:52 +0300, Emmanuel Grumbach wrote:
> >> I'd be glad if someone could take a look. If not, I'll have someone
> >> from our team to look at it, but I don't know how long it will take...
> >
> > Without looking too much - it seems to me that this is a fundamental
> > problem with PTK rekeying, in that it re-uses the key index that is
> > intended to avoid this.
>
> In this case, the AP is openWRT. I guess the Key idx is chosen in
> software, so maybe the proper fix would be to have openWRT increment
> the key index when it rekeys?
Neither the spec nor the code allow that.
johannes
next prev parent reply other threads:[~2015-05-15 18:35 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-15 6:48 mac80211 drops packet with old IV after rekeying Emmanuel Grumbach
2015-05-15 7:25 ` Johannes Berg
2015-05-15 7:52 ` Emmanuel Grumbach
2015-05-15 18:35 ` Johannes Berg [this message]
2015-05-16 18:18 ` Emmanuel Grumbach
2015-05-16 19:57 ` Johannes Berg
2015-05-17 16:05 ` Jouni Malinen
2015-05-17 18:23 ` Emmanuel Grumbach
2015-05-17 19:25 ` Johannes Berg
2015-05-17 19:49 ` Emmanuel Grumbach
2015-05-17 20:05 ` Johannes Berg
2015-05-17 20:13 ` Emmanuel Grumbach
2015-05-17 20:22 ` Johannes Berg
2015-05-18 6:14 ` Peer, Ilan
2015-05-18 8:03 ` Janusz Dziedzic
2015-05-18 14:40 ` Ben Greear
2015-05-18 15:02 ` Johannes Berg
2015-05-18 19:34 ` Emmanuel Grumbach
2015-05-18 19:47 ` Alexander Wetzel
2015-05-18 21:55 ` Johannes Berg
2015-05-20 20:55 ` mac80211 drops packet with old IV after rekeying - workaround patch for CCMP Alexander Wetzel
2015-05-21 7:11 ` Johannes Berg
2015-05-17 19:14 ` mac80211 drops packet with old IV after rekeying Johannes Berg
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