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erspan: return PACKET_REJECT when the appropriate tunnel is not found
If erspan tunnel hasn't been established, we'd better send icmp port unreachable message after receive erspan packets. Fixes: 84e54fe ("gre: introduce native tunnel support for ERSPAN") Cc: William Tu <u9012063@gmail.com> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Acked-by: William Tu <u9012063@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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