netdev - What is the correct way to install an L2 multicast route into a bridge?

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Message-ID: <20200708090454.zvb6o7jr2woirw3i@skbuf>
Date:   Wed, 8 Jul 2020 12:04:54 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     nikolay@...ulusnetworks.com, roopa@...ulusnetworks.com,
        netdev@...r.kernel.org
Subject: What is the correct way to install an L2 multicast route into a
 bridge?

Hi,

I am confused after reading man/man8/bridge.8. I have a bridge br0 with
4 interfaces (eth0 -> eth3), and I would like to install a rule such
that the non-IP multicast address of 09:00:70:00:00:00 is only forwarded
towards 3 of those ports, instead of being flooded.
The manual says that 'bridge mdb' is only for IP multicast, and implies
that 'bridge fdb append' (NLM_F_APPEND) is only used by vxlan. So, what
is the correct user interface for what I am trying to do?

Thank you,
-Vladimir