tree 831a294f3567e407dbe228c94134f3923fefc22d
parent 2cc3b1c174313d34d7a681a07f61c474be2f79b7
author Johannes Berg <johannes.berg@intel.com> 1454589079 +0100
committer chrmhoffmann <chrmhoffmann@gmail.com> 1612815699 +0100

ipv6: add option to drop unicast encapsulated in L2 multicast

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 IPv6 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.

Change-Id: I8a0b45fbd533236fbd785e6e8aa20fb780aa1397
Reviewed-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>