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

[Johannes Berg]

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

ÂÂÂÂÂÂÂÂÂWhen a host sends a datagram to a link-layer broadcast address,
ÂÂÂÂÂÂÂÂÂthe IP destination address MUST be a legal IP broadcast or IP
ÂÂÂÂÂÂÂÂÂmulticast address.

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

You can probably find other examples too.

johannes