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authorJohannes Berg <johannes.berg@intel.com>2016-02-04 13:31:19 +0100
committerDavid S. Miller <davem@davemloft.net>2016-02-11 04:27:36 -0500
commitabbc30436d39dfed8ebfca338d253f211ac7b094 (patch)
treed7ce58e0300818d2effa7a7bd03bd5667f0d9d36 /include
parent97daf331455077645ae1f13438bebd3d1a2e94ee (diff)
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. 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 'include')
-rw-r--r--include/linux/ipv6.h1
-rw-r--r--include/uapi/linux/ipv6.h1
2 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 402753bccafa..4a4c1ae826cb 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -50,6 +50,7 @@ struct ipv6_devconf {
__s32 mc_forwarding;
#endif
__s32 disable_ipv6;
+ __s32 drop_unicast_in_l2_multicast;
__s32 accept_dad;
__s32 force_tllao;
__s32 ndisc_notify;
diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
index 38b4fef20219..4c413570efe8 100644
--- a/include/uapi/linux/ipv6.h
+++ b/include/uapi/linux/ipv6.h
@@ -174,6 +174,7 @@ enum {
DEVCONF_USE_OIF_ADDRS_ONLY,
DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
+ DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
DEVCONF_MAX
};