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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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