Subject: Re: [PATCH] ipv6: ip6mr: Recalc UDP checksum before forwarding

From: Eric Dumazet <[email-masked]>
Date: Wed, 13 Dec 2017 09:52:44 -0800

On Wed, 2017-12-13 at 22:20 +1100, Brendan McGrath wrote:
> Currently, when forwarding from a Virtual Interface to a Physical
> Interface, ip_summed is set to a value of CHECKSUM_UNNECESSARY and
> the UDP checksum has not been calculated.
> 

This seems a bug then ?
CHECKSUM_UNNECESSARY means checksum has been validated.
Not that we want it being computed later in the stack.

If we force a checksum here, what guarantee do we have packet was not
corrupted before we do this ?