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Date:   Tue, 28 Jul 2020 17:31:03 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH v2 net] bareudp: forbid mixing IP and MPLS in
 multiproto mode

From: Guillaume Nault <>
Date: Sat, 25 Jul 2020 15:06:47 +0200

> In multiproto mode, bareudp_xmit() accepts sending multicast MPLS and
> IPv6 packets regardless of the bareudp ethertype. In practice, this
> let an IP tunnel send multicast MPLS packets, or an MPLS tunnel send
> IPv6 packets.
> We need to restrict the test further, so that the multiproto mode only
> enables
>   * IPv6 for IPv4 tunnels,
>   * or multicast MPLS for unicast MPLS tunnels.
> To improve clarity, the protocol validation is moved to its own
> function, where each logical test has its own condition.
> v2: s/ntohs/htons/
> Fixes: 4b5f67232d95 ("net: Special handling for IP & MPLS.")
> Signed-off-by: Guillaume Nault <>

Applied and queued up for -stable, thanks.

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