selftests: forwarding: Test mirroring to deleted device

Tests that the mirroring code catches up with deletion of a mirrored-to
device.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/forwarding/mirror_gre_changes.sh b/tools/testing/selftests/net/forwarding/mirror_gre_changes.sh
index 50ab346..a35fd55 100755 (executable)
--- a/tools/testing/selftests/net/forwarding/mirror_gre_changes.sh
+++ b/tools/testing/selftests/net/forwarding/mirror_gre_changes.sh
@@ -12,6 +12,7 @@ ALL_TESTS="
        test_tun_up
        test_egress_up
        test_remote_ip
+       test_tun_del
 "
 
 NUM_NETIFS=6
@@ -159,6 +160,35 @@ test_span_gre_remote_ip()
        log_test "$what: remote address change ($tcflags)"
 }
 
+test_span_gre_tun_del()
+{
+       local tundev=$1; shift
+       local type=$1; shift
+       local flags=$1; shift
+       local local_ip=$1; shift
+       local remote_ip=$1; shift
+       local what=$1; shift
+
+       RET=0
+
+       mirror_install $swp1 ingress $tundev "matchall $tcflags"
+       quick_test_span_gre_dir $tundev ingress
+       ip link del dev $tundev
+       fail_test_span_gre_dir $tundev ingress
+
+       tunnel_create $tundev $type $local_ip $remote_ip \
+                     ttl 100 tos inherit $flags
+
+       # Recreating the tunnel doesn't reestablish mirroring, so reinstall it
+       # and verify it works for the follow-up tests.
+       mirror_uninstall $swp1 ingress
+       mirror_install $swp1 ingress $tundev "matchall $tcflags"
+       quick_test_span_gre_dir $tundev ingress
+       mirror_uninstall $swp1 ingress
+
+       log_test "$what: tunnel deleted ($tcflags)"
+}
+
 test_ttl()
 {
        test_span_gre_ttl gt4 gretap ip "mirror to gretap"
@@ -183,6 +213,14 @@ test_remote_ip()
        test_span_gre_remote_ip gt6 ip6gretap 2001:db8:2::2 2001:db8:2::4 "mirror to ip6gretap"
 }
 
+test_tun_del()
+{
+       test_span_gre_tun_del gt4 gretap "" \
+                             192.0.2.129 192.0.2.130 "mirror to gretap"
+       test_span_gre_tun_del gt6 ip6gretap allow-localremote \
+                             2001:db8:2::1 2001:db8:2::2 "mirror to ip6gretap"
+}
+
 test_all()
 {
        slow_path_trap_install $swp1 ingress