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Reporting sk_drops to user space was available for UDP sockets using /proc interface. Add this to sock_diag, so that we can have the same information available to ss users, and we'll be able to add sk_drops indications for TCP sockets as well. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>