netdev - Re: [PATCH] macvlan: transmit multicast as unicast in source mode

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Message-Id: <20150323.165046.44048598018869192.davem@davemloft.net>
Date:	Mon, 23 Mar 2015 16:50:46 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	michael-dev@...i-braun.de
Cc:	netdev@...r.kernel.org, projekt-wlan@....tu-ilmenau.de
Subject: Re: [PATCH] macvlan: transmit multicast as unicast in source mode

From: Michael Braun <michael-dev@...i-braun.de>
Date: Sun, 22 Mar 2015 13:29:49 +0100

> When having multiple remote mac addresses assigned to different macvlan
> source devices created on top of the same other netdev, multicast packets
> send on one interface will be also received by the remote machines
> asssigned to the other macvlan device.
> 
> This is because multicast packets are transmitted as layer-2 multicast.
> Thought, not all protocols need their multicast packets to be transmitted
> as layer-2 multicast, esp. ARP, IPv4 and IPv6. Most importantly, IPv6
> router advertisments will be processed even if received as layer-2 unicast.
> 
> So this patch adds support for replicating multicast packets and sending
> them out as unicast by changing the destination mac address.
> This fixes IPv6 autoconf addresses and routes on the remote stations
> assigned to different macvlan devices.
> 
> There are two new flags: UNICAST and UNICAST_ALL. The first only rewrites
> ARP, IPv4 and IPv6 (and their 802.1Q tagged variant), the latter rewrites
> all multicast packets.
> 
> Signed-off-by: Michael Braun <michael-dev@...i-braun.de>

I want someone who understands macvlans better to review this before
I apply it.

Thanks.
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