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-rw-r--r--test/test_gre.py61
1 files changed, 61 insertions, 0 deletions
diff --git a/test/test_gre.py b/test/test_gre.py
index eed3d8b2c6f..dd7b8bc6b8f 100644
--- a/test/test_gre.py
+++ b/test/test_gre.py
@@ -867,6 +867,67 @@ class TestGRE(VppTestCase):
route_tun1_dst.add_vpp_config()
route_tun2_dst.add_vpp_config()
+ def test_gre_loop(self):
+ """ GRE tunnel loop Tests """
+
+ #
+ # Create an L3 GRE tunnel.
+ # - set it admin up
+ # - assign an IP Addres
+ #
+ gre_if = VppGreInterface(self,
+ self.pg0.local_ip4,
+ "1.1.1.2")
+ gre_if.add_vpp_config()
+ gre_if.admin_up()
+ gre_if.config_ip4()
+
+ #
+ # add a route to the tunnel's destination that points
+ # through the tunnel, hence forming a loop in the forwarding
+ # graph
+ #
+ route_dst = VppIpRoute(self, "1.1.1.2", 32,
+ [VppRoutePath("0.0.0.0",
+ gre_if.sw_if_index)])
+ route_dst.add_vpp_config()
+
+ #
+ # packets to the tunnels destination should be dropped
+ #
+ tx = self.create_stream_ip4(self.pg0, "1.1.1.1", "1.1.1.2")
+ self.send_and_assert_no_replies(self.pg2, tx)
+
+ self.logger.info(self.vapi.ppcli("sh adj 7"))
+
+ #
+ # break the loop
+ #
+ route_dst.modify([VppRoutePath(self.pg1.remote_ip4,
+ self.pg1.sw_if_index)])
+ route_dst.add_vpp_config()
+
+ rx = self.send_and_expect(self.pg0, tx, self.pg1)
+
+ #
+ # a good route throught the tunnel to check it restacked
+ #
+ route_via_tun_2 = VppIpRoute(self, "2.2.2.2", 32,
+ [VppRoutePath("0.0.0.0",
+ gre_if.sw_if_index)])
+ route_via_tun_2.add_vpp_config()
+
+ tx = self.create_stream_ip4(self.pg0, "2.2.2.3", "2.2.2.2")
+ rx = self.send_and_expect(self.pg0, tx, self.pg1)
+ self.verify_tunneled_4o4(self.pg1, rx, tx,
+ self.pg0.local_ip4, "1.1.1.2")
+
+ #
+ # cleanup
+ #
+ route_via_tun_2.remove_vpp_config()
+ gre_if.remove_vpp_config()
+
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)