This patch causes the proper attribute flags to be set,
in the case that IPv6 UDP checksums are disabled, so that
userspace ie. `ip l2tp show tunnel` knows about it.
Signed-off-by: NAsbjoern Sloth Toennesen <asbjorn@asbjorn.st>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>