netdev - Re: [PATCH net-next] bridge: multicast to unicast

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Message-ID: <1483949149.17582.1.camel@sipsolutions.net>
Date:   Mon, 09 Jan 2017 09:05:49 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Linus Lüssing <linus.luessing@...3.blue>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org, Felix Fietkau <nbd@....name>,
        Michael Braun <michael-dev@...i-braun.de>
Subject: Re: [PATCH net-next] bridge: multicast to unicast

On Sat, 2017-01-07 at 16:15 +0100, Linus Lüssing wrote:

> Actually, I do not quite understand that remark in the mac80211
> multicast-to-unicast patch. IP should not care about the ethernet
> header?

But it does, for example RFC 1122 states:

         When a host sends a datagram to a link-layer broadcast address,
         the IP destination address MUST be a legal IP broadcast or IP
         multicast address.

         A host SHOULD silently discard a datagram that is received via
         a link-layer broadcast (see Section 2.4) but does not specify
         an IP multicast or broadcast destination address.

You can probably find other examples too.

johannes