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

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Message-ID: <CAF=yD-K9TjhuATs2ERNsgbnDitXTBuV3yirGnwYZ26dOvo0hFA@mail.gmail.com>
Date:   Thu, 7 Nov 2019 13:59:23 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Jiri Benc <jbenc@...hat.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, Nov 7, 2019 at 12:31 PM Jiri Benc <jbenc@...hat.com> wrote:
>
> 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.

This still needs only one socket, right? Just fall back to inet if
ipv6 is disabled.