From: David Ahern <dsah...@gmail.com>

[ Upstream commit 0360894a05ed52be268e3c4d40b2df9d94975fa6 ]

Some distributions (e.g., debian buster) do not install ping6. Re-use
the hook in pmtu.sh to detect this and fallback to ping.

Fixes: a0e11da78f48 ("fib_tests: Add tests for metrics on routes")
Signed-off-by: David Ahern <dsah...@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 tools/testing/selftests/net/fib_tests.sh |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/net/fib_tests.sh
+++ b/tools/testing/selftests/net/fib_tests.sh
@@ -17,6 +17,8 @@ PAUSE=no
 IP="ip -netns ns1"
 NS_EXEC="ip netns exec ns1"
 
+which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
+
 log_test()
 {
        local rc=$1
@@ -1100,7 +1102,7 @@ ipv6_route_metrics_test()
        log_test $rc 0 "Multipath route with mtu metric"
 
        $IP -6 ro add 2001:db8:104::/64 via 2001:db8:101::2 mtu 1300
-       run_cmd "ip netns exec ns1 ping6 -w1 -c1 -s 1500 2001:db8:104::1"
+       run_cmd "ip netns exec ns1 ${ping6} -w1 -c1 -s 1500 2001:db8:104::1"
        log_test $? 0 "Using route with mtu metric"
 
        run_cmd "$IP -6 ro add 2001:db8:114::/64 via  2001:db8:101::2  congctl 
lock foo"


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