This set of patches is the first one for a more efficient, group aware multicast forwarding infrastructure in batman-adv.
This initial set mainly consists of the integration of announcing the location of multicast listeners via the translation table mechanism to be able to find out which batman-adv nodes are actually interested in certain multicast traffic. As well as the signalizing of this announcement capability via a new multicast TVLV. Finally some basic multicast forwarding opitimizations are introduced: If all nodes signalized the MLA capability then link-local IPv6 traffic will be dropped if there is no interested listener or gets forwarded via a batman-adv unicast packet if there is just one node interested in the data. For now, these optimizations only apply if all nodes in the mesh have no bridge interface on top their bat0 interface. However making it possible with bridges, too, and other features are on the roadmap. See the according wiki page for details [1]. [1]: http://www.open-mesh.org/projects/batman-adv/wiki/Multicast-ideas-updated#Roadmap
