A Sample of using socket cookie and uid for traffic monitoring

Add a sample program to demostrate the possible usage of
get_socket_cookie and get_socket_uid helper function. The program will
store bytes and packets counting of in/out traffic monitored by iptables
and store the stats in a bpf map in per socket base. The owner uid of
the socket will be stored as part of the data entry. A shell script for
running the program is also included.

Acked-by: Alexei Starovoitov <[email protected]>
Acked-by: Willem de Bruijn <[email protected]>
Signed-off-by: Chenbo Feng <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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