selftests: icmp_redirect: IPv6 PMTU info should be cleared after redirect

[ Upstream commit 0e02bf5de46ae30074a2e1a8194a422a84482a1a ]

After redirecting, it's already a new path. So the old PMTU info should
be cleared. The IPv6 test "mtu exception plus redirect" should only
has redirect info without old PMTU.

The IPv4 test can not be changed because of legacy.

Fixes: ec8105352869 ("selftests: Add redirect tests")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/testing/selftests/net/icmp_redirect.sh b/tools/testing/selftests/net/icmp_redirect.sh
index bfcabee5015528ff54eaae28c88c3f1a0ea2d5bc..104a7a5f13b1ea883832639de48aac0c3863d05a 100755 (executable)
--- a/tools/testing/selftests/net/icmp_redirect.sh
+++ b/tools/testing/selftests/net/icmp_redirect.sh
@@ -309,9 +309,10 @@ check_exception()
        fi
        log_test $? 0 "IPv4: ${desc}"
 
-       if [ "$with_redirect" = "yes" ]; then
+       # No PMTU info for test "redirect" and "mtu exception plus redirect"
+       if [ "$with_redirect" = "yes" ] && [ "$desc" != "redirect exception plus mtu" ]; then
                ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \
-               grep -q "${H2_N2_IP6} .*via ${R2_LLADDR} dev br0.*${mtu}"
+               grep -v "mtu" | grep -q "${H2_N2_IP6} .*via ${R2_LLADDR} dev br0"
        elif [ -n "${mtu}" ]; then
                ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \
                grep -q "${mtu}"