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From: "Linus Lüssing" <>
To: Stephen Hemminger <>
	Nikolay Aleksandrov <>,
	Roopa Prabhu <>,,,,
	"David S . Miller" <>
Subject: Re: [Bridge] [RFC PATCH net-next] bridge: Implement MLD Querier wake-up calls / Android bug workaround
Date: Sun, 23 Aug 2020 17:42:39 +0200	[thread overview]
Message-ID: <20200823154239.GA2302@otheros> (raw)
In-Reply-To: <20200816150813.0b998607@hermes.lan>

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?

  parent reply	other threads:[~2020-08-23 15:42 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-16 20:24 Linus Lüssing
2020-08-16 22:08 ` [Bridge] " Stephen Hemminger
2020-08-16 22:10   ` David Miller
2020-08-23 15:42   ` Linus Lüssing [this message]
2020-08-23 17:19     ` Stephen Hemminger
2020-08-23 19:49     ` Felix Fietkau
2020-08-17  4:10 ` David Miller
2020-08-17  8:39 ` Bjørn Mork
2020-08-17 13:17   ` [gluon] " Sven Eckelmann
2020-08-17 13:35     ` Bjørn Mork
2020-08-17 14:24     ` Daniel Golle
2020-08-18  0:35 ` [bridge] fdde3c8b90: WARNING:at_net/core/rtnetlink.c:#rtnl_link_register kernel test robot

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