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ipv4: add option to drop unicast encapsulated in L2 multicast

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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@ssi.bg>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2016-02-04 13:31:17 +01:00
committed by David S. Miller
parent ccad099356
commit 12b74dfadb
4 changed files with 34 additions and 1 deletions
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7
Documentation/networking/ip-sysctl.txt
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@@ -1216,6 +1216,13 @@ promote_secondaries - BOOLEAN
promote a corresponding secondary IP address instead of
removing all the corresponding secondary IP addresses.
drop_unicast_in_l2_multicast - BOOLEAN
Drop any unicast IP packets that are received in link-layer
multicast (or broadcast) frames.
This behavior (for multicast) is actually a SHOULD in RFC
1122, but is disabled by default for compatibility reasons.
Default: off (0)
tag - INTEGER
Allows you to write a number, which can be used as required.