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batman-adv: Modified forwarding behaviour for multicast packets

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With this patch a multicast packet is not always simply flooded anymore,
the behaviour for the following cases is changed to reduce
unnecessary overhead:

If all nodes within the horizon of a certain node have signalized
multicast listener announcement capability then an IPv6 multicast packet
with a destination of IPv6 link-local scope (excluding ff02::1) coming
from the upstream of this node...

* ...is dropped if there is no according multicast listener in the
  translation table,
* ...is forwarded via unicast if there is a single node with interested
  multicast listeners
* ...and otherwise still gets flooded.

Signed-off-by: Linus Lüssing <[email protected]>
Signed-off-by: Marek Lindner <[email protected]>
Signed-off-by: Antonio Quartulli <[email protected]>
This commit is contained in:
Linus Lüssing 2014-02-15 17:47:52 +01:00 • committed by Antonio Quartulli
commit 1d8ab8d3c1
10 changed files with 275 additions and 26 deletions
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9
Documentation/ABI/testing/sysfs-class-net-mesh
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@ -76,6 +76,15 @@ Description:
is used to classify clients as "isolated" by the
Extended Isolation feature.
What: /sys/class/net/<mesh_iface>/mesh/multicast_mode
Date: Feb 2014
Contact: Linus Lüssing <[email protected]>
Description:
Indicates whether multicast optimizations are enabled
or disabled. If set to zero then all nodes in the
mesh are going to use classic flooding for any
multicast packet with no optimizations.
What: /sys/class/net/<mesh_iface>/mesh/network_coding
Date: Nov 2012
Contact: Martin Hundeboll <[email protected]>