69cbaba4f4
With batman-adv 2022.0 support for directed multicast in bridged setups for routeable multicast addresses was refined - if the Linux kernel is 5.14 or higher. This backports the according changes made to the Linux bridge in 5.14 and kernel exports to 5.10, to allow batman-adv to tap into and use the Linux bridge's Multicast Router Discovery (RFC4286) based multicast router state. Which enables the batman-adv multicast optimizations not only for IPv6 link-local multicast addresses (ffX2::/16) but now also IPv6 routeable multicast addresses (ffXY::/16, with Y > 2) in Gluon. Note that since batman-adv v2019.3 with a Linux < 5.14 multicast routers were initially "guessed" by checking for listeners on ff02::2 (all-routers). Which could potentially overestimate - like in our case: This approach won't work for us, as every Gluon node listens on ff02::2 on the local-node interface due to Gluon's radvd for local IPv6 prefix assignments. Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> |
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