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authorJohannes Berg <johannes.berg@intel.com>2016-02-04 13:31:17 +0100
committerDavid S. Miller <davem@davemloft.net>2016-02-11 04:27:35 -0500
commit12b74dfadb5a7a23baf4db941dc9fd9d371f249a (patch)
tree40009e4d2e0eb925967d1ffde4f0c3b415f47ee3 /net/ipv4/devinet.c
parentccad0993567812e88617f105c01b04f1528538b6 (diff)
downloadop-kernel-dev-12b74dfadb5a7a23baf4db941dc9fd9d371f249a.zip
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ipv4: 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 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>
Diffstat (limited to 'net/ipv4/devinet.c')
-rw-r--r--net/ipv4/devinet.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index cebd9d3..dbbab28 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -2192,6 +2192,8 @@ static struct devinet_sysctl_table {
"promote_secondaries"),
DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
"route_localnet"),
+ DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
+ "drop_unicast_in_l2_multicast"),
},
};
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