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From: Johannes Berg <johannes@sipsolutions.net>
Date: Fri, 06 Jan 2017 14:54:01 +0100
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Subject: Re: [Bridge] [PATCH net-next] bridge: multicast to unicast
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To: Felix Fietkau <nbd@nbd.name>, Linus =?ISO-8859-1?Q?L=FCssing?= <linus.luessing@c0d3.blue>, netdev@vger.kernel.org
Cc: bridge@lists.linux-foundation.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, "David S . Miller" <davem@davemloft.net>, Michael Braun <michael-dev@fami-braun.de>


> The bridge layer can use IGMP snooping to ensure that the multicast
> stream is only transmitted to clients that are actually a member of
> the group. Can the mac80211 feature do the same?

No, it'll convert the packet for all clients that are behind that
netdev. But that's an argument for dropping the mac80211 feature, which
hasn't been merged upstream yet, no?

johannes