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authorSimon Wunderlich <simon.wunderlich@open-mesh.com>2016-03-12 10:49:33 +0100
committerAntonio Quartulli <a@unstable.cc>2016-05-10 18:26:45 +0800
commitcd9c7bfbbae81bbe75de585ac57b1097e86cf109 (patch)
treea496d3fd3a24cd7b3647535a6a581aabc48f65aa /net/batman-adv/packet.h
parent2cd45a0671d9e37ab20e844fc4c84717a38b7f52 (diff)
batman-adv: add detection for complex bridge loops
There are network setups where the current bridge loop avoidance can't detect bridge loops. The minimal setup affected would consist of two LANs and two separate meshes, connected in a ring like that: A...(mesh1)...B | | (LAN1) (LAN2) | | C...(mesh2)...D Since both the meshes and backbones are separate, the bridge loop avoidance has not enough information to detect and avoid the loop in this case. Even if these scenarios can't be fixed easily, these kind of loops can be detected. This patch implements a periodic check (running every 60 seconds for now) which sends a broadcast frame with a random MAC address on each backbone VLAN. If a broadcast frame with the same MAC address is received shortly after on the mesh, we know that there must be a loop and report that incident as well as throw an uevent to let others handle that problem. Signed-off-by: Simon Wunderlich <simon.wunderlich@open-mesh.com> [sven@narfation.org: fix conflicts with current version] Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <a@unstable.cc>
Diffstat (limited to 'net/batman-adv/packet.h')
-rw-r--r--net/batman-adv/packet.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index 0796dfdfbb60..372128ddb474 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -175,6 +175,7 @@ enum batadv_bla_claimframe {
BATADV_CLAIM_TYPE_UNCLAIM = 0x01,
BATADV_CLAIM_TYPE_ANNOUNCE = 0x02,
BATADV_CLAIM_TYPE_REQUEST = 0x03,
+ BATADV_CLAIM_TYPE_LOOPDETECT = 0x04,
};
/**