96a208295040 ("ip6_vti: use IS_REACHABLE to avoid some compile errors")
a8757147905e ("ip6_vti: not register vti_ipv6_handler twice")
2ab110cbb0c0 ("ip6_vti: support IP6IP tunnel processing")
08622869ed3f ("ip6_vti: support IP6IP6 tunnel processing with .cb_handler")