netdev - Re: [PATCH net-next 1/2] UDP tunnel encapsulation module for tunnelling different protocols like MPLS,IP,NSH etc.

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Date:   Thu, 7 Nov 2019 18:31:36 +0100
From:   Jiri Benc <jbenc@...hat.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Martin Varghese <martinvarghesenokia@...il.com>,
        Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>, scott.drennan@...ia.com,
        martin.varghese@...ia.com
Subject: Re: [PATCH net-next 1/2] UDP tunnel encapsulation module for
 tunnelling different protocols like MPLS,IP,NSH etc.

On Thu, 7 Nov 2019 11:35:07 -0500, Willem de Bruijn wrote:
> If the bareudp device binds to a specific port on all local addresses,
> which I think it's doing judging from what it passes to udp_sock_create
> (but I may very well be missing something), then in6addr_any alone will
> suffice to receive both v6 and v4 packets.

This will not work when IPv6 is disabled, either by the kernel config
or administratively. We do need to have two sockets.

 Jiri