inner_protocol was added to struct sk_buff in
0d89d2035fe063461a5ddb609b2c12e7fb006e44 ("MPLS: Add limited GSO support"),
which is scheduled to be included in v3.11.
That patch did not update __copy_skb_header to copy the inner_protocol.
Signed-off-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
        new->transport_header   = old->transport_header;
        new->network_header     = old->network_header;
        new->mac_header         = old->mac_header;
+       new->inner_protocol     = old->inner_protocol;
        new->inner_transport_header = old->inner_transport_header;
        new->inner_network_header = old->inner_network_header;
        new->inner_mac_header = old->inner_mac_header;