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authorNeale Ranns <nranns@cisco.com>2016-11-15 09:46:51 +0000
committerDamjan Marion <dmarion.lists@gmail.com>2016-11-22 21:26:55 +0000
commit177bbdcd8fa4e7621c5bdd3afd8c6e74b603e096 (patch)
treecf234b5bf8d79dac6a43570a903a11de44e26497 /test/test_gre.py
parent7afe9e38269a30682a5e392b0e876e18d1465c31 (diff)
GRE tests and fixes
Change-Id: I234240e9bdd4b69ad64a17b1449ae1e81c0edaca Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'test/test_gre.py')
-rw-r--r--test/test_gre.py700
1 files changed, 700 insertions, 0 deletions
diff --git a/test/test_gre.py b/test/test_gre.py
new file mode 100644
index 00000000000..b5a1e346eca
--- /dev/null
+++ b/test/test_gre.py
@@ -0,0 +1,700 @@
+#!/usr/bin/env python
+
+import unittest
+import socket
+from logging import *
+
+from framework import VppTestCase, VppTestRunner
+from vpp_sub_interface import VppSubInterface, VppDot1QSubint, VppDot1ADSubint
+from vpp_gre_interface import VppGreInterface
+from vpp_ip_route import IpRoute, IpPath
+from vpp_papi_provider import L2_VTR_OP
+
+from scapy.packet import Raw
+from scapy.layers.l2 import Ether, Dot1Q, ARP, GRE
+from scapy.layers.inet import IP, UDP
+from scapy.layers.inet6 import ICMPv6ND_NS, IPv6, UDP
+from scapy.contrib.mpls import MPLS
+from scapy.volatile import RandMAC, RandIP
+
+
+class TestGRE(VppTestCase):
+ """ GRE Test Case """
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestGRE, cls).setUpClass()
+
+ def setUp(self):
+ super(TestGRE, self).setUp()
+
+ # create 2 pg interfaces - set one in a non-default table.
+ self.create_pg_interfaces(range(2))
+
+ self.pg1.set_table_ip4(1)
+ for i in self.pg_interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+
+ def tearDown(self):
+ super(TestGRE, self).tearDown()
+
+ def create_stream_ip4(self, src_if, src_ip, dst_ip):
+ pkts = []
+ for i in range(0, 257):
+ info = self.create_packet_info(src_if.sw_if_index,
+ src_if.sw_if_index)
+ payload = self.info_to_payload(info)
+ p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
+ IP(src=src_ip, dst=dst_ip) /
+ UDP(sport=1234, dport=1234) /
+ Raw(payload))
+ info.data = p.copy()
+ pkts.append(p)
+ return pkts
+
+ def create_tunnel_stream_4o4(self, src_if,
+ tunnel_src, tunnel_dst,
+ src_ip, dst_ip):
+ pkts = []
+ for i in range(0, 257):
+ info = self.create_packet_info(src_if.sw_if_index,
+ src_if.sw_if_index)
+ payload = self.info_to_payload(info)
+ p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
+ IP(src=tunnel_src, dst=tunnel_dst) /
+ GRE() /
+ IP(src=src_ip, dst=dst_ip) /
+ UDP(sport=1234, dport=1234) /
+ Raw(payload))
+ info.data = p.copy()
+ pkts.append(p)
+ return pkts
+
+ def create_tunnel_stream_6o4(self, src_if,
+ tunnel_src, tunnel_dst,
+ src_ip, dst_ip):
+ pkts = []
+ for i in range(0, 257):
+ info = self.create_packet_info(src_if.sw_if_index,
+ src_if.sw_if_index)
+ payload = self.info_to_payload(info)
+ p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
+ IP(src=tunnel_src, dst=tunnel_dst) /
+ GRE() /
+ IPv6(src=src_ip, dst=dst_ip) /
+ UDP(sport=1234, dport=1234) /
+ Raw(payload))
+ info.data = p.copy()
+ pkts.append(p)
+ return pkts
+
+ def create_tunnel_stream_l2o4(self, src_if,
+ tunnel_src, tunnel_dst):
+ pkts = []
+ for i in range(0, 257):
+ info = self.create_packet_info(src_if.sw_if_index,
+ src_if.sw_if_index)
+ payload = self.info_to_payload(info)
+ p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
+ IP(src=tunnel_src, dst=tunnel_dst) /
+ GRE() /
+ Ether(dst=RandMAC('*:*:*:*:*:*'),
+ src=RandMAC('*:*:*:*:*:*')) /
+ IP(src=str(RandIP()), dst=str(RandIP())) /
+ UDP(sport=1234, dport=1234) /
+ Raw(payload))
+ info.data = p.copy()
+ pkts.append(p)
+ return pkts
+
+ def create_tunnel_stream_vlano4(self, src_if,
+ tunnel_src, tunnel_dst, vlan):
+ pkts = []
+ for i in range(0, 257):
+ info = self.create_packet_info(src_if.sw_if_index,
+ src_if.sw_if_index)
+ payload = self.info_to_payload(info)
+ p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
+ IP(src=tunnel_src, dst=tunnel_dst) /
+ GRE() /
+ Ether(dst=RandMAC('*:*:*:*:*:*'),
+ src=RandMAC('*:*:*:*:*:*')) /
+ Dot1Q(vlan=vlan) /
+ IP(src=str(RandIP()), dst=str(RandIP())) /
+ UDP(sport=1234, dport=1234) /
+ Raw(payload))
+ info.data = p.copy()
+ pkts.append(p)
+ return pkts
+
+ def verify_filter(self, capture, sent):
+ if not len(capture) == len(sent):
+ # filter out any IPv6 RAs from the captur
+ for p in capture:
+ if (p.haslayer(ICMPv6ND_RA)):
+ capture.remove(p)
+ return capture
+
+ def verify_tunneled_4o4(self, src_if, capture, sent,
+ tunnel_src, tunnel_dst):
+
+ capture = self.verify_filter(capture, sent)
+ self.assertEqual(len(capture), len(sent))
+
+ for i in range(len(capture)):
+ try:
+ tx = sent[i]
+ rx = capture[i]
+
+ tx_ip = tx[IP]
+ rx_ip = rx[IP]
+
+ self.assertEqual(rx_ip.src, tunnel_src)
+ self.assertEqual(rx_ip.dst, tunnel_dst)
+
+ rx_gre = rx[GRE]
+ rx_ip = rx_gre[IP]
+
+ self.assertEqual(rx_ip.src, tx_ip.src)
+ self.assertEqual(rx_ip.dst, tx_ip.dst)
+ # IP processing post pop has decremented the TTL
+ self.assertEqual(rx_ip.ttl + 1, tx_ip.ttl)
+
+ except:
+ rx.show()
+ tx.show()
+ raise
+
+ def verify_tunneled_l2o4(self, src_if, capture, sent,
+ tunnel_src, tunnel_dst):
+ capture = self.verify_filter(capture, sent)
+ self.assertEqual(len(capture), len(sent))
+
+ for i in range(len(capture)):
+ try:
+ tx = sent[i]
+ rx = capture[i]
+
+ tx_ip = tx[IP]
+ rx_ip = rx[IP]
+
+ self.assertEqual(rx_ip.src, tunnel_src)
+ self.assertEqual(rx_ip.dst, tunnel_dst)
+
+ rx_gre = rx[GRE]
+ rx_l2 = rx_gre[Ether]
+ rx_ip = rx_l2[IP]
+ tx_gre = tx[GRE]
+ tx_l2 = tx_gre[Ether]
+ tx_ip = tx_l2[IP]
+
+ self.assertEqual(rx_ip.src, tx_ip.src)
+ self.assertEqual(rx_ip.dst, tx_ip.dst)
+ # bridged, not L3 forwarded, so no TTL decrement
+ self.assertEqual(rx_ip.ttl, tx_ip.ttl)
+
+ except:
+ rx.show()
+ tx.show()
+ raise
+
+ def verify_tunneled_vlano4(self, src_if, capture, sent,
+ tunnel_src, tunnel_dst, vlan):
+ try:
+ capture = self.verify_filter(capture, sent)
+ self.assertEqual(len(capture), len(sent))
+ except:
+ capture.show()
+ raise
+
+ for i in range(len(capture)):
+ try:
+ tx = sent[i]
+ rx = capture[i]
+
+ tx_ip = tx[IP]
+ rx_ip = rx[IP]
+
+ self.assertEqual(rx_ip.src, tunnel_src)
+ self.assertEqual(rx_ip.dst, tunnel_dst)
+
+ rx_gre = rx[GRE]
+ rx_l2 = rx_gre[Ether]
+ rx_vlan = rx_l2[Dot1Q]
+ rx_ip = rx_l2[IP]
+
+ self.assertEqual(rx_vlan.vlan, vlan)
+
+ tx_gre = tx[GRE]
+ tx_l2 = tx_gre[Ether]
+ tx_ip = tx_l2[IP]
+
+ self.assertEqual(rx_ip.src, tx_ip.src)
+ self.assertEqual(rx_ip.dst, tx_ip.dst)
+ # bridged, not L3 forwarded, so no TTL decrement
+ self.assertEqual(rx_ip.ttl, tx_ip.ttl)
+
+ except:
+ rx.show()
+ tx.show()
+ raise
+
+ def verify_decapped_4o4(self, src_if, capture, sent):
+ capture = self.verify_filter(capture, sent)
+ self.assertEqual(len(capture), len(sent))
+
+ for i in range(len(capture)):
+ try:
+ tx = sent[i]
+ rx = capture[i]
+
+ tx_ip = tx[IP]
+ rx_ip = rx[IP]
+ tx_gre = tx[GRE]
+ tx_ip = tx_gre[IP]
+
+ self.assertEqual(rx_ip.src, tx_ip.src)
+ self.assertEqual(rx_ip.dst, tx_ip.dst)
+ # IP processing post pop has decremented the TTL
+ self.assertEqual(rx_ip.ttl + 1, tx_ip.ttl)
+
+ except:
+ rx.show()
+ tx.show()
+ raise
+
+ def verify_decapped_6o4(self, src_if, capture, sent):
+ capture = self.verify_filter(capture, sent)
+ self.assertEqual(len(capture), len(sent))
+
+ for i in range(len(capture)):
+ try:
+ tx = sent[i]
+ rx = capture[i]
+
+ tx_ip = tx[IP]
+ rx_ip = rx[IPv6]
+ tx_gre = tx[GRE]
+ tx_ip = tx_gre[IPv6]
+
+ self.assertEqual(rx_ip.src, tx_ip.src)
+ self.assertEqual(rx_ip.dst, tx_ip.dst)
+ self.assertEqual(rx_ip.hlim + 1, tx_ip.hlim)
+
+ except:
+ rx.show()
+ tx.show()
+ raise
+
+ def test_gre(self):
+ """ GRE tunnel Tests """
+
+ #
+ # Create an L3 GRE tunnel.
+ # - set it admin up
+ # - assign an IP Addres
+ # - Add a route via the tunnel
+ #
+ gre_if = VppGreInterface(self,
+ self.pg0.local_ip4,
+ "1.1.1.2")
+ gre_if.add_vpp_config()
+
+ #
+ # The double create (create the same tunnel twice) should fail,
+ # and we should still be able to use the original
+ #
+ try:
+ gre_if.add_vpp_config()
+ except Exception:
+ pass
+ else:
+ self.fail("Double GRE tunnel add does not fail")
+
+ gre_if.admin_up()
+ gre_if.config_ip4()
+
+ route_via_tun = IpRoute(self, "4.4.4.4", 32,
+ [IpPath("0.0.0.0", gre_if.sw_if_index)])
+
+ route_via_tun.add_vpp_config()
+
+ #
+ # Send a packet stream that is routed into the tunnel
+ # - they are all dropped since the tunnel's desintation IP
+ # is unresolved - or resolves via the default route - which
+ # which is a drop.
+ #
+ tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "4.4.4.4")
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+
+ try:
+ self.assertEqual(0, len(rx))
+ except:
+ error("GRE packets forwarded without DIP resolved")
+ error(rx.show())
+ raise
+
+ #
+ # Add a route that resolves the tunnel's destination
+ #
+ route_tun_dst = IpRoute(self, "1.1.1.2", 32,
+ [IpPath(self.pg0.remote_ip4, self.pg0.sw_if_index)])
+ route_tun_dst.add_vpp_config()
+
+ #
+ # Send a packet stream that is routed into the tunnel
+ # - packets are GRE encapped
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "4.4.4.4")
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ self.verify_tunneled_4o4(self.pg0, rx, tx,
+ self.pg0.local_ip4, "1.1.1.2")
+
+ #
+ # Send tunneled packets that match the created tunnel and
+ # are decapped and forwarded
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_4o4(self.pg0,
+ "1.1.1.2",
+ self.pg0.local_ip4,
+ self.pg0.local_ip4,
+ self.pg0.remote_ip4)
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ self.verify_decapped_4o4(self.pg0, rx, tx)
+
+ #
+ # Send tunneled packets that do not match the tunnel's src
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_4o4(self.pg0,
+ "1.1.1.3",
+ self.pg0.local_ip4,
+ self.pg0.local_ip4,
+ self.pg0.remote_ip4)
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ try:
+ self.assertEqual(0, len(rx))
+ except:
+ error("GRE packets forwarded despite no SRC address match")
+ error(rx.show())
+ raise
+
+ #
+ # Configure IPv6 on the PG interface so we can route IPv6
+ # packets
+ #
+ self.pg0.config_ip6()
+ self.pg0.resolve_ndp()
+
+ #
+ # Send IPv6 tunnel encapslated packets
+ # - dropped since IPv6 is not enabled on the tunnel
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_6o4(self.pg0,
+ "1.1.1.2",
+ self.pg0.local_ip4,
+ self.pg0.local_ip6,
+ self.pg0.remote_ip6)
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ try:
+ self.assertEqual(0, len(rx))
+ except:
+ error("IPv6 GRE packets forwarded despite IPv6 not enabled on tunnel")
+ error(rx.show())
+ raise
+
+ #
+ # Enable IPv6 on the tunnel
+ #
+ gre_if.config_ip6()
+
+ #
+ # Send IPv6 tunnel encapslated packets
+ # - forwarded since IPv6 is enabled on the tunnel
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_6o4(self.pg0,
+ "1.1.1.2",
+ self.pg0.local_ip4,
+ self.pg0.local_ip6,
+ self.pg0.remote_ip6)
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ self.verify_decapped_6o4(self.pg0, rx, tx)
+
+ #
+ # test case cleanup
+ #
+ route_tun_dst.remove_vpp_config()
+ route_via_tun.remove_vpp_config()
+ gre_if.remove_vpp_config()
+
+ self.pg0.unconfig_ip6()
+
+ def test_gre_vrf(self):
+ """ GRE tunnel VRF Tests """
+
+ #
+ # Create an L3 GRE tunnel whose destination is in the non-default
+ # table. The underlay is thus non-default - the overlay is still
+ # the default.
+ # - set it admin up
+ # - assign an IP Addres
+ #
+ gre_if = VppGreInterface(self, self.pg1.local_ip4,
+ "2.2.2.2",
+ outer_fib_id=1)
+ gre_if.add_vpp_config()
+ gre_if.admin_up()
+ gre_if.config_ip4()
+
+ #
+ # Add a route via the tunnel - in the overlay
+ #
+ route_via_tun = IpRoute(self, "9.9.9.9", 32,
+ [IpPath("0.0.0.0", gre_if.sw_if_index)])
+ route_via_tun.add_vpp_config()
+
+ #
+ # Add a route that resolves the tunnel's destination - in the
+ # underlay table
+ #
+ route_tun_dst = IpRoute(self, "2.2.2.2", 32, table_id=1,
+ paths=[IpPath(self.pg1.remote_ip4,
+ self.pg1.sw_if_index)])
+ route_tun_dst.add_vpp_config()
+
+ #
+ # Send a packet stream that is routed into the tunnel
+ # packets are sent in on pg0 which is in the default table
+ # - packets are GRE encapped
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "9.9.9.9")
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg1.get_capture()
+ self.verify_tunneled_4o4(self.pg1, rx, tx,
+ self.pg1.local_ip4, "2.2.2.2")
+
+ #
+ # Send tunneled packets that match the created tunnel and
+ # are decapped and forwarded. This tests the decap lookup
+ # does not happen in the encap table
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_4o4(self.pg1,
+ "2.2.2.2",
+ self.pg1.local_ip4,
+ self.pg0.local_ip4,
+ self.pg0.remote_ip4)
+ self.pg1.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ self.verify_decapped_4o4(self.pg0, rx, tx)
+
+ #
+ # test case cleanup
+ #
+ route_tun_dst.remove_vpp_config()
+ route_via_tun.remove_vpp_config()
+ gre_if.remove_vpp_config()
+
+ def test_gre_l2(self):
+ """ GRE tunnel L2 Tests """
+
+ #
+ # Add routes to resolve the tunnel destinations
+ #
+ route_tun1_dst = IpRoute(self, "2.2.2.2", 32,
+ [IpPath(self.pg0.remote_ip4,
+ self.pg0.sw_if_index)])
+ route_tun2_dst = IpRoute(self, "2.2.2.3", 32,
+ [IpPath(self.pg0.remote_ip4,
+ self.pg0.sw_if_index)])
+
+ route_tun1_dst.add_vpp_config()
+ route_tun2_dst.add_vpp_config()
+
+ #
+ # Create 2 L2 GRE tunnels and x-connect them
+ #
+ gre_if1 = VppGreInterface(self, self.pg0.local_ip4,
+ "2.2.2.2",
+ is_teb=1)
+ gre_if2 = VppGreInterface(self, self.pg0.local_ip4,
+ "2.2.2.3",
+ is_teb=1)
+ gre_if1.add_vpp_config()
+ gre_if2.add_vpp_config()
+
+ gre_if1.admin_up()
+ gre_if2.admin_up()
+
+ self.vapi.sw_interface_set_l2_xconnect(gre_if1.sw_if_index,
+ gre_if2.sw_if_index,
+ enable=1)
+ self.vapi.sw_interface_set_l2_xconnect(gre_if2.sw_if_index,
+ gre_if1.sw_if_index,
+ enable=1)
+
+ #
+ # Send in tunnel encapped L2. expect out tunnel encapped L2
+ # in both directions
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_l2o4(self.pg0,
+ "2.2.2.2",
+ self.pg0.local_ip4)
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ self.verify_tunneled_l2o4(self.pg0, rx, tx,
+ self.pg0.local_ip4,
+ "2.2.2.3")
+
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_l2o4(self.pg0,
+ "2.2.2.3",
+ self.pg0.local_ip4)
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ self.verify_tunneled_l2o4(self.pg0, rx, tx,
+ self.pg0.local_ip4,
+ "2.2.2.2")
+
+ self.vapi.sw_interface_set_l2_xconnect(gre_if1.sw_if_index,
+ gre_if2.sw_if_index,
+ enable=0)
+ self.vapi.sw_interface_set_l2_xconnect(gre_if2.sw_if_index,
+ gre_if1.sw_if_index,
+ enable=0)
+
+ #
+ # Create a VLAN sub-interfaces on the GRE TEB interfaces
+ # then x-connect them
+ #
+ gre_if_11 = VppDot1QSubint(self, gre_if1, 11)
+ gre_if_12 = VppDot1QSubint(self, gre_if2, 12)
+
+ # gre_if_11.add_vpp_config()
+ # gre_if_12.add_vpp_config()
+
+ gre_if_11.admin_up()
+ gre_if_12.admin_up()
+
+ self.vapi.sw_interface_set_l2_xconnect(gre_if_11.sw_if_index,
+ gre_if_12.sw_if_index,
+ enable=1)
+ self.vapi.sw_interface_set_l2_xconnect(gre_if_12.sw_if_index,
+ gre_if_11.sw_if_index,
+ enable=1)
+
+ #
+ # Configure both to pop thier respective VLAN tags,
+ # so that during the x-coonect they will subsequently push
+ #
+ self.vapi.sw_interface_set_l2_tag_rewrite(gre_if_12.sw_if_index,
+ L2_VTR_OP.L2_POP_1,
+ 12)
+ self.vapi.sw_interface_set_l2_tag_rewrite(gre_if_11.sw_if_index,
+ L2_VTR_OP.L2_POP_1,
+ 11)
+
+ #
+ # Send traffic in both directiond - expect the VLAN tags to
+ # be swapped.
+ #
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_vlano4(self.pg0,
+ "2.2.2.2",
+ self.pg0.local_ip4,
+ 11)
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ self.verify_tunneled_vlano4(self.pg0, rx, tx,
+ self.pg0.local_ip4,
+ "2.2.2.3",
+ 12)
+
+ self.vapi.cli("clear trace")
+ tx = self.create_tunnel_stream_vlano4(self.pg0,
+ "2.2.2.3",
+ self.pg0.local_ip4,
+ 12)
+ self.pg0.add_stream(tx)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg0.get_capture()
+ self.verify_tunneled_vlano4(self.pg0, rx, tx,
+ self.pg0.local_ip4,
+ "2.2.2.2",
+ 11)
+
+ #
+ # Cleanup Test resources
+ #
+ gre_if_11.remove_vpp_config()
+ gre_if_12.remove_vpp_config()
+ gre_if1.remove_vpp_config()
+ gre_if2.remove_vpp_config()
+ route_tun1_dst.add_vpp_config()
+ route_tun2_dst.add_vpp_config()
+
+
+if __name__ == '__main__':
+ unittest.main(testRunner=VppTestRunner)