topotests: Add a basic route leak vrf test

A recent commit broke this functionality, so add a very basic
route leak vrf test.

router bgp 99 vrf DONNA
  address-family ipv4 uni
    redistribute connected
    import vrf EVA
router bgp 99 vrf EVA
  address-family ipv4 uni
    redistribute connected
    import vrf DONNA

Routes should be leaked between the two vrf's.  Ensure that it does.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

tests/topotests/bgp-vrf-route-leak-basic/r1/bgpd.conf

@@ -0,0 +1,14 @@
+hostname r1
+
+router bgp 99 vrf DONNA
+  address-family ipv4 unicast
+    redistribute connected
+    import vrf EVA
+  !
+!
+router bgp 99 vrf EVA
+  address-family ipv4 unicast
+    redistribute connected
+    import vrf DONNA
+  !
+!

tests/topotests/bgp-vrf-route-leak-basic/r1/zebra.conf

@@ -0,0 +1,18 @@
+hostname r1
+
+int dummy1
+  ip address 10.0.0.1/24
+  no shut
+!
+int dummy2
+  ip address 10.0.1.1/24
+  no shut
+!
+int dummy3
+  ip address 10.0.2.1/24
+  no shut
+!
+int dummy4
+  ip address 10.0.3.1/24
+  no shut
+!

tests/topotests/bgp-vrf-route-leak-basic/setup_vrfs

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+ip link add DONNA type vrf table 1001
+ip link add EVA type vrf table 1002
+
+ip link add dummy1 type dummy
+ip link add dummy2 type dummy
+ip link add dummy3 type dummy
+ip link add dummy4 type dummy
+
+ip link set dummy1 master DONNA
+ip link set dummy2 master EVA
+ip link set dummy3 master DONNA
+ip link set dummy4 master EVA
+
+

tests/topotests/bgp-vrf-route-leak-basic/test_bgp.py

@@ -0,0 +1,132 @@
+#!/usr/bin/env python
+
+#
+# test_bgp.py
+#
+# Copyright (c) 2018 Cumulus Networks, Inc.
+#                    Donald Sharp
+#
+# Permission to use, copy, modify, and/or distribute this software
+# for any purpose with or without fee is hereby granted, provided
+# that the above copyright notice and this permission notice appear
+# in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND Cumulus Networks DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+#
+
+"""
+test_bgp.py: Test basic vrf route leaking
+"""
+
+import json
+import os
+import sys
+import pytest
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, '../'))
+
+# pylint: disable=C0413
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+from lib.topolog import logger
+
+from mininet.topo import Topo
+
+
+class BGPVRFTopo(Topo):
+    def build(self, *_args, **_opts):
+        "Build function"
+        tgen = get_topogen(self)
+
+        for routern in range(1, 2):
+            tgen.add_router('r{}'.format(routern))
+
+def setup_module(mod):
+    "Sets up the pytest environment"
+    tgen = Topogen(BGPVRFTopo, mod.__name__)
+    tgen.start_topology()
+
+    # For all registered routers, load the zebra configuration file
+    for rname, router in tgen.routers().iteritems():
+        router.run("/bin/bash {}/setup_vrfs".format(CWD))
+        router.load_config(
+            TopoRouter.RD_ZEBRA,
+            os.path.join(CWD, '{}/zebra.conf'.format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_BGP,
+            os.path.join(CWD, '{}/bgpd.conf'.format(rname))
+        )
+
+    # After loading the configurations, this function loads configured daemons.
+    tgen.start_router()
+    #tgen.mininet_cli()
+
+def teardown_module(mod):
+    "Teardown the pytest environment"
+    tgen = get_topogen()
+
+    # This function tears down the whole topology.
+    tgen.stop_topology()
+
+def test_vrf_route_leak():
+    logger.info("Ensure that routes are leaked back and forth")
+    tgen = get_topogen()
+    # Don't run this test if we have any failure.
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears['r1']
+
+    donna = r1.vtysh_cmd("show ip route vrf DONNA json", isjson=True)
+    route0 = donna["10.0.0.0/24"][0]
+    assert route0['protocol'] == "connected"
+    route1 = donna["10.0.1.0/24"][0]
+    assert route1['protocol'] == "bgp"
+    assert route1['selected'] == True
+    nhop = route1['nexthops'][0]
+    assert nhop['fib'] == True
+    route2 = donna["10.0.2.0/24"][0]
+    assert route2['protocol'] == "connected"
+    route3 = donna["10.0.3.0/24"][0]
+    assert route3['protocol'] == "bgp"
+    assert route3['selected'] == True
+    nhop = route3['nexthops'][0]
+    assert nhop['fib'] == True
+    eva = r1.vtysh_cmd("show ip route vrf EVA json", isjson=True)
+    route0 = eva["10.0.0.0/24"][0]
+    assert route0['protocol'] == "bgp"
+    assert route0['selected'] == True
+    nhop = route0['nexthops'][0]
+    assert nhop['fib'] == True
+    route1 = eva["10.0.1.0/24"][0]
+    assert route1['protocol'] == "connected"
+    route2 = eva["10.0.2.0/24"][0]
+    assert route2['protocol'] == "bgp"
+    assert route2['selected'] == True
+    nhop = route2['nexthops'][0]
+    assert nhop['fib'] == True
+    route3 = eva["10.0.3.0/24"][0]
+    assert route3['protocol'] == "connected"
+    #tgen.mininet_cli()
+
+def test_memory_leak():
+    "Run the memory leak test and report results."
+    tgen = get_topogen()
+    if not tgen.is_memleak_enabled():
+        pytest.skip('Memory leak test/report is disabled')
+
+    tgen.report_memory_leaks()
+
+
+if __name__ == '__main__':
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))