From: Jakub Sitnicki <j...@redhat.com>
Date: Fri, 13 Jan 2017 10:12:20 +0100
> With ip6gre we have a tunnel header which also makes the tunnel MTU
> smaller. We need to reserve room for it. Previously we were using up
> space reserved for the Tunnel Encapsulation Limit option
> header (RFC 2473).
>
> Also, after commit b05229f44228 ("gre6: Cleanup GREv6 transmit path,
> call common GRE functions") our contract with the caller has
> changed. Now we check if the packet length exceeds the tunnel MTU after
> the tunnel header has been pushed, unlike before.
>
> This is reflected in the check where we look at the packet length minus
> the size of the tunnel header, which is already accounted for in tunnel
> MTU.
>
> Fixes: b05229f44228 ("gre6: Cleanup GREv6 transmit path, call common GRE
> functions")
> Signed-off-by: Jakub Sitnicki <j...@redhat.com>
Applied and queued up for -stable, thanks.
