tests: Test if prefix is not re-advertised downstream with blackhole community

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>

8 files changed, 172 insertions, 0 deletions

diff --git a/tests/topotests/bgp_blackhole_community/__init__.py b/tests/topotests/bgp_blackhole_community/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/topotests/bgp_blackhole_community/__init__.py
diff --git a/tests/topotests/bgp_blackhole_community/r1/bgpd.conf b/tests/topotests/bgp_blackhole_community/r1/bgpd.conf
new file mode 100644
index 0000000000..be86bd6b2c
--- /dev/null
+++ b/tests/topotests/bgp_blackhole_community/r1/bgpd.conf
@@ -0,0 +1,13 @@
+!
+router bgp 65001
+  no bgp ebgp-requires-policy
+  neighbor r1-eth0 interface remote-as external
+  address-family ipv4 unicast
+    redistribute connected
+    neighbor r1-eth0 route-map r2 out
+  exit-address-family
+ !
+!
+route-map r2 permit 10
+  set community blackhole
+!
diff --git a/tests/topotests/bgp_blackhole_community/r1/zebra.conf b/tests/topotests/bgp_blackhole_community/r1/zebra.conf
new file mode 100644
index 0000000000..70dc5e516d
--- /dev/null
+++ b/tests/topotests/bgp_blackhole_community/r1/zebra.conf
@@ -0,0 +1,10 @@
+!
+interface lo
+ ip address 172.16.255.254/32
+!
+interface r1-eth0
+ ip address 192.168.0.1/24
+!
+ip forwarding
+!
+
diff --git a/tests/topotests/bgp_blackhole_community/r2/bgpd.conf b/tests/topotests/bgp_blackhole_community/r2/bgpd.conf
new file mode 100644
index 0000000000..a4fb45e1ff
--- /dev/null
+++ b/tests/topotests/bgp_blackhole_community/r2/bgpd.conf
@@ -0,0 +1,6 @@
+!
+router bgp 65002
+  no bgp ebgp-requires-policy
+  neighbor r2-eth0 interface remote-as external
+  neighbor r2-eth1 interface remote-as external
+!
diff --git a/tests/topotests/bgp_blackhole_community/r2/zebra.conf b/tests/topotests/bgp_blackhole_community/r2/zebra.conf
new file mode 100644
index 0000000000..307e5187ca
--- /dev/null
+++ b/tests/topotests/bgp_blackhole_community/r2/zebra.conf
@@ -0,0 +1,9 @@
+!
+interface r2-eth0
+ ip address 192.168.0.2/24
+!
+interface r2-eth1
+ ip address 192.168.1.1/24
+!
+ip forwarding
+!
diff --git a/tests/topotests/bgp_blackhole_community/r3/bgpd.conf b/tests/topotests/bgp_blackhole_community/r3/bgpd.conf
new file mode 100644
index 0000000000..f0635cb8c9
--- /dev/null
+++ b/tests/topotests/bgp_blackhole_community/r3/bgpd.conf
@@ -0,0 +1,5 @@
+!
+router bgp 65003
+  no bgp ebgp-requires-policy
+  neighbor r3-eth0 interface remote-as external
+!
diff --git a/tests/topotests/bgp_blackhole_community/r3/zebra.conf b/tests/topotests/bgp_blackhole_community/r3/zebra.conf
new file mode 100644
index 0000000000..05ab56d6f1
--- /dev/null
+++ b/tests/topotests/bgp_blackhole_community/r3/zebra.conf
@@ -0,0 +1,6 @@
+!
+interface r3-eth0
+ ip address 192.168.1.2/24
+!
+ip forwarding
+!
diff --git a/tests/topotests/bgp_blackhole_community/test_bgp_blackhole_community.py b/tests/topotests/bgp_blackhole_community/test_bgp_blackhole_community.py
new file mode 100644
index 0000000000..b61ad354e2
--- /dev/null
+++ b/tests/topotests/bgp_blackhole_community/test_bgp_blackhole_community.py
@@ -0,0 +1,123 @@
+#!/usr/bin/env python
+
+#
+# Copyright (c) 2021 by
+# Donatas Abraitis <donatas.abraitis@gmail.com>
+#
+# 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 NETDEF 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 if 172.16.255.254/32 tagged with BLACKHOLE community is not
+re-advertised downstream.
+"""
+
+import os
+import sys
+import json
+import pytest
+import functools
+
+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 TemplateTopo(Topo):
+    def build(self, *_args, **_opts):
+        tgen = get_topogen(self)
+
+        for routern in range(1, 4):
+            tgen.add_router("r{}".format(routern))
+
+        switch = tgen.add_switch("s1")
+        switch.add_link(tgen.gears["r1"])
+        switch.add_link(tgen.gears["r2"])
+
+        switch = tgen.add_switch("s2")
+        switch.add_link(tgen.gears["r2"])
+        switch.add_link(tgen.gears["r3"])
+
+
+def setup_module(mod):
+    tgen = Topogen(TemplateTopo, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for i, (rname, router) in enumerate(router_list.items(), 1):
+        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))
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_blackhole_community():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    def _bgp_converge():
+        output = json.loads(
+            tgen.gears["r2"].vtysh_cmd("show ip bgp 172.16.255.254/32 json")
+        )
+        expected = {"paths": [{"community": {"list": ["blackhole", "noAdvertise"]}}]}
+        return topotest.json_cmp(output, expected)
+
+    def _bgp_no_advertise():
+        output = json.loads(
+            tgen.gears["r2"].vtysh_cmd(
+                "show ip bgp neighbor r2-eth1 advertised-routes json"
+            )
+        )
+        expected = {
+            "advertisedRoutes": {},
+            "totalPrefixCounter": 0,
+            "filteredPrefixCounter": 0,
+        }
+
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_converge)
+    success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+
+    assert result is None, 'Failed bgp convergence in "{}"'.format(tgen.gears["r2"])
+
+    test_func = functools.partial(_bgp_no_advertise)
+    success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+
+    assert result is None, 'Advertised blackhole tagged prefix in "{}"'.format(
+        tgen.gears["r2"]
+    )
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))