This is the fifth revision of the basic multicast optimization patches.
It fixes two bugs:
For one thing packets to the IPv6 all-hosts-link-scope multicast address (ff02::1) were optimized, too. However this is the one link local address which we should not never optimize (see RFC4541, section 3 [1]).
For another since commit 87d4a282 ("batman-adv: remove useless find_router look up" the unicast-forwarding of multicast packets was broken and I had only runtime tested the patches based on an older commit (before 87d4a282 such unicast-forwarding was "only" broken if a gateway-server was present).
Also note that rebasing on top of the TT-VLAN patches wasn't trivial: Simply resolving the rebase complaints resulted in subtle runtime bugs. A few lines in the counting methods added to translation-table.c needed changes.
Cheers, Linus
[1]: Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Snooping Switches -> "Packets with the all hosts link-scope address should be forwarded on all ports." https://tools.ietf.org/html/rfc4541