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Currently we allow the creation of 8021q devices on top of ipvlan, but such devices are nonfunctional, as the underlying ipvlan rx_hanlder hook can't match the relevant traffic. Be explicit and forbid the creation of such nonfunctional devices. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>