netdev - Re: [PATCH v3 1/4] ipv4: add option to drop unicast encapsulated in L2 multicast

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Message-Id: <20160211.042750.376596563683727607.davem@davemloft.net>
Date:	Thu, 11 Feb 2016 04:27:50 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	johannes@...solutions.net
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org, ja@....bg,
	johannes.berg@...el.com
Subject: Re: [PATCH v3 1/4] ipv4: add option to drop unicast encapsulated
 in L2 multicast

From: Johannes Berg <johannes@...solutions.net>
Date: Thu,  4 Feb 2016 13:31:17 +0100

> From: Johannes Berg <johannes.berg@...el.com>
> 
> In order to solve a problem with 802.11, the so-called hole-196 attack,
> add an option (sysctl) called "drop_unicast_in_l2_multicast" which, if
> enabled, causes the stack to drop IPv4 unicast packets encapsulated in
> link-layer multi- or broadcast frames. Such frames can (as an attack)
> be created by any member of the same wireless network and transmitted
> as valid encrypted frames since the symmetric key for broadcast frames
> is shared between all stations.
> 
> Additionally, enabling this option provides compliance with a SHOULD
> clause of RFC 1122.
> 
> Reviewed-by: Julian Anastasov <ja@....bg>
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>

Applied.