[PATCH] selftests/bpf: Fix bpf_nf selftest failure

[Saket Kumar Bhaskar]

For systems with missing iptables-legacy tool, this selftest fails.

Add check to find if iptables-legacy tool is available and skip the
test if the tool is missing.

Fixes: de9c8d848d90 ("selftests/bpf: S/iptables/iptables-legacy/ in the bpf_nf 
and xdp_synproxy test")
Signed-off-by: Saket Kumar Bhaskar <sk...@linux.ibm.com>
---
 tools/testing/selftests/bpf/prog_tests/bpf_nf.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_nf.c 
b/tools/testing/selftests/bpf/prog_tests/bpf_nf.c
index dbd13f8e42a7..dd6512fa652b 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_nf.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_nf.c
@@ -63,6 +63,12 @@ static void test_bpf_nf_ct(int mode)
                .repeat = 1,
        );
 
+       if (SYS_NOFAIL("iptables-legacy --version")) {
+               fprintf(stdout, "Missing required iptables-legacy tool\n");
+               test__skip();
+               return;
+       }
+
        skel = test_bpf_nf__open_and_load();
        if (!ASSERT_OK_PTR(skel, "test_bpf_nf__open_and_load"))
                return;
-- 
2.43.5