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

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>

diff --git a/tools/testing/selftests/net/icmp_redirect.sh b/tools/testing/selftests/net/icmp_redirect.sh
index 3a111ac..ecbf57f 100755 (executable)
--- a/tools/testing/selftests/net/icmp_redirect.sh
+++ b/tools/testing/selftests/net/icmp_redirect.sh
@@ -313,9 +313,10 @@ 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}"