netdev - Re: TUN interfaces loopback

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Date:	Sun, 29 Nov 2015 17:40:20 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	Radu Rendec <radu.rendec@...dbit.ro>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: TUN interfaces loopback

On Thu, Nov 26, 2015 at 1:58 AM, Radu Rendec <radu.rendec@...dbit.ro> wrote:
> I tracked down the problem to ip_route_input_slow() in net/ipv4/route.c
> [...]
> The next problem is that packets are seen as "martians" and dropped,
> most probably because of __fib_validate_source() failing due to the
> fact that the input interface is not the expected one.

Have you tried setting this?

accept_local - BOOLEAN
        Accept packets with local source addresses. In combination with
        suitable routing, this can be used to direct packets between two
        local interfaces over the wire and have them accepted properly.
        default FALSE
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