From: Daniel Danzberger <dan...@dd-wrt.com> Date: Fri, 24 Jun 2016 12:35:18 +0200
> The bridge is falsly dropping ipv6 mulitcast packets if there is: > 1. No ipv6 address assigned on the brigde. > 2. No external mld querier present. > 3. The internal querier enabled. > > When the bridge fails to build mld queries, because it has no > ipv6 address, it slilently returns, but keeps the local querier enabled. > This specific case causes confusing packet loss. > > Ipv6 multicast snooping can only work if: > a) An external querier is present > OR > b) The bridge has an ipv6 address an is capable of sending own queries > > Otherwise it has to forward/flood the ipv6 multicast traffic, > because snooping cannot work. > > This patch fixes the issue by adding a flag to the bridge struct that > indicates that there is currently no ipv6 address assinged to the bridge > and returns a false state for the local querier in > __br_multicast_querier_exists(). > > Special thanks to Linus Lüssing. > > Signed-off-by: Daniel Danzberger <dan...@dd-wrt.com> Applied.
