Make sure to indicate to tunnel driver that key.tun_id is set,
otherwise gre won't recognize the metadata.
Fixes: d3aa45ce6b94 ("bpf: add helpers to access tunnel metadata") Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>