samples/bpf: add userspace example for prohibiting sockets
Add examples preventing a process in a cgroup from opening a socket based family, protocol and type. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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