On Sun, Aug 16, 2020 at 03:08:13PM -0700, Stephen Hemminger wrote: > Rather than adding yet another feature to the bridge, could this hack be done by > having a BPF hook? or netfilter module? Hi Stephen, Thanks for the constructive feedback and suggestions! The netfilter approach sounds tempting. However as far as I know OpenWrt's firewall has no easy layer 2 netfilter integration yet. So it has default layer 3 netfilter rules, but not for layer 2. Ideally I'd want to work towards a solution where things "just work as expected" when a user enables "IGMP Snooping" in the UI. I could hack the netfilter rules into netifd, the OpenWrt network manager, when it configures the bridge. But not sure if the OpenWrt maintainers would like that... Any preferences from the OpenWrt maintainers side? Regards, Linus PS: With BPF I don't have that much experience yet. I would need to write a daemon which would parse the MLD packets and would fetch the FDB via netlink, right? If so, sounds like that would need way more than 300 lines of code. And that would need to be maintained within OpenWrt, right?
