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

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Date:   Mon, 17 Aug 2020 10:39:00 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     Linus Lüssing <linus.luessing@...3.blue>
Cc:     netdev@...r.kernel.org,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        bridge@...ts.linux-foundation.org, gluon@...beck.freifunk.net,
        openwrt-devel@...ts.openwrt.org,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [RFC PATCH net-next] bridge: Implement MLD Querier wake-up calls / Android bug workaround

Linus Lüssing <linus.luessing@...3.blue> writes:

> Currently there are mobile devices (e.g. Android) which are not able
> to receive and respond to MLD Queries reliably because the Wifi driver
> filters a lot of ICMPv6 when the device is asleep - including
> MLD. This in turn breaks IPv6 communication when MLD Snooping is
> enabled. However there is one ICMPv6 type which is allowed to pass and
> which can be used to wake up the mobile device: ICMPv6 Echo Requests.

This is not a bug.  They are deliberately breaking IPv6 because they
consider this a feature.  You should not try to work around such issues.
It is a fight you cannot win.  Any workaround will only encourage them
to come up with new ways to break IPv6.


Bjørn