[PATCH 5.15 805/917] selftests/bpf/xdp_redirect_multi: Use arping to accurate the arp number

[Greg Kroah-Hartman]

From: Hangbin Liu <liuhangbin@xxxxxxxxx>

[ Upstream commit f53ea9dbf78d42a10e2392b5c59362ccc224fd1d ]

The arp request number triggered by ping none exist address is not accurate,
which may lead the test false negative/positive. Change to use arping to
accurate the arp number. Also do not use grep pattern match for dot.

Fixes: d23292476297 ("selftests/bpf: Add xdp_redirect_multi test")
Suggested-by: Jiri Benc <jbenc@xxxxxxxxxx>
Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20211027033553.962413-3-liuhangbin@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 tools/testing/selftests/bpf/test_xdp_redirect_multi.sh | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_xdp_redirect_multi.sh b/tools/testing/selftests/bpf/test_xdp_redirect_multi.sh
index b20b96ba72ef0..c2a933caa32d4 100755
--- a/tools/testing/selftests/bpf/test_xdp_redirect_multi.sh
+++ b/tools/testing/selftests/bpf/test_xdp_redirect_multi.sh
@@ -127,7 +127,7 @@ do_ping_tests()
 	ip netns exec ns3 tcpdump -i veth0 -nn -l -e &> ${LOG_DIR}/ns1-3_${mode}.log &
 	sleep 0.5
 	# ARP test
-	ip netns exec ns1 ping 192.0.2.254 -i 0.1 -c 4 &> /dev/null
+	ip netns exec ns1 arping -q -c 2 -I veth0 192.0.2.254
 	# IPv4 test
 	ip netns exec ns1 ping 192.0.2.253 -i 0.1 -c 4 &> /dev/null
 	# IPv6 test
@@ -136,13 +136,13 @@ do_ping_tests()
 	pkill -9 tcpdump
 
 	# All netns should receive the redirect arp requests
-	[ $(grep -c "who-has 192.0.2.254" ${LOG_DIR}/ns1-1_${mode}.log) -gt 4 ] && \
+	[ $(grep -cF "who-has 192.0.2.254" ${LOG_DIR}/ns1-1_${mode}.log) -eq 4 ] && \
 		test_pass "$mode arp(F_BROADCAST) ns1-1" || \
 		test_fail "$mode arp(F_BROADCAST) ns1-1"
-	[ $(grep -c "who-has 192.0.2.254" ${LOG_DIR}/ns1-2_${mode}.log) -le 4 ] && \
+	[ $(grep -cF "who-has 192.0.2.254" ${LOG_DIR}/ns1-2_${mode}.log) -eq 2 ] && \
 		test_pass "$mode arp(F_BROADCAST) ns1-2" || \
 		test_fail "$mode arp(F_BROADCAST) ns1-2"
-	[ $(grep -c "who-has 192.0.2.254" ${LOG_DIR}/ns1-3_${mode}.log) -le 4 ] && \
+	[ $(grep -cF "who-has 192.0.2.254" ${LOG_DIR}/ns1-3_${mode}.log) -eq 2 ] && \
 		test_pass "$mode arp(F_BROADCAST) ns1-3" || \
 		test_fail "$mode arp(F_BROADCAST) ns1-3"
 
-- 
2.33.0