selftests: forwarding: Add MAC Authentication Bypass (MAB) test cases

Add four test cases to verify MAB functionality:

* Verify that a locked FDB entry can be generated by the bridge,
  preventing a host from communicating via the bridge. Test that user
  space can clear the "locked" flag by replacing the entry, thereby
  authenticating the host and allowing it to communicate via the bridge.

* Test that an entry cannot roam to a locked port, but that it can roam
  to an unlocked port.

* Test that MAB can only be enabled on a port that is both locked and
  has learning enabled.

* Test that locked FDB entries are flushed from a port when MAB is
  disabled.

Signed-off-by: Hans J. Schultz <netdev@kapio-technology.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 3ffb9d6c0950..1c4f866de7d7 100755
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -137,6 +137,14 @@ check_locked_port_support()
 	fi
 }
 
+check_port_mab_support()
+{
+	if ! bridge -d link show | grep -q "mab"; then
+		echo "SKIP: iproute2 too old; MacAuth feature not supported."
+		return $ksft_skip
+	fi
+}
+
 if [[ "$(id -u)" -ne 0 ]]; then
 	echo "SKIP: need root privileges"
 	exit $ksft_skip