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2019-06-27selftests/bpf: add sockopt test that exercises BPF_F_ALLOW_MULTIStanislav Fomichev1-0/+71
sockopt test that verifies chaining behavior. v9: * setsockopt chaining example v7: * rework the test to verify cgroup getsockopt chaining Cc: Andrii Nakryiko <andriin@fb.com> Cc: Martin Lau <kafai@fb.com> Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>