Re: [Bridge] [RFC PATCH net-next] bridge: Implement MLD Querier wake-up calls / Android bug workaround

On 2020-08-23 17:42, Linus Lüssing wrote:

On Sun, Aug 16, 2020 at 03:08:13PM -0700, Stephen Hemminger wrote:

quoted

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?

Enabling bridge netfilter comes with a very significant performance
cost, so it's not something that should be done in a default configuration.

- Felix