ip6_tunnel: fix ip6 tunnel lookup in collect_md mode
In collect_md mode, if the tun dev is down, it still can call __ip6_tnl_rcv to receive on packets, and the rx statistics increase improperly. When the md tunnel is down, it's not neccessary to increase RX drops for the tunnel device, packets would be recieved on fallback tunnel, and the RX drops on fallback device will be increased as expected. Fixes: 8d79266b ("ip6_tunnel: add collect_md mode to IPv6 tunnels") Cc: Alexei Starovoitov <ast@fb.com> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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