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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# Copyright (c) 2021 by
# Donatas Abraitis <donatas.abraitis@gmail.com>
#
"""
Test if 172.16.255.254/32 tagged with BLACKHOLE community is not
re-advertised downstream outside local AS.
"""
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.common_config import step
pytestmark = [pytest.mark.bgpd]
def build_topo(tgen):
for routern in range(1, 5):
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"])
switch = tgen.add_switch("s3")
switch.add_link(tgen.gears["r2"])
switch.add_link(tgen.gears["r4"])
def setup_module(mod):
tgen = Topogen(build_topo, 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", "noExport"]}}]}
return topotest.json_cmp(output, expected)
def _bgp_no_advertise_ebgp():
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)
def _bgp_no_advertise_ibgp():
output = json.loads(
tgen.gears["r2"].vtysh_cmd(
"show ip bgp neighbor r2-eth2 advertised-routes json"
)
)
expected = {
"advertisedRoutes": {"172.16.255.254/32": {}},
"totalPrefixCounter": 2,
}
return topotest.json_cmp(output, expected)
def _bgp_verify_nexthop_validity():
output = json.loads(tgen.gears["r4"].vtysh_cmd("show bgp nexthop json"))
expected = {
"ipv6": {
"fe80::202:ff:fe00:99": {
"valid": True,
"complete": True,
"igpMetric": 0,
"pathCount": 2,
"nexthops": [{"interfaceName": "r4-eth0"}],
},
}
}
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"])
step("Check if 172.16.255.254/32 is not advertised to eBGP peers")
test_func = functools.partial(_bgp_no_advertise_ebgp)
success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert (
result is None
), 'Advertised blackhole tagged prefix to eBGP peers in "{}"'.format(
tgen.gears["r2"]
)
step("Check if 172.16.255.254/32 is advertised to iBGP peers")
test_func = functools.partial(_bgp_no_advertise_ibgp)
success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert (
result is None
), 'Withdrawn blackhole tagged prefix to iBGP peers in "{}"'.format(
tgen.gears["r2"]
)
step("Verify if the nexthop set via route-map on r4 is marked valid")
test_func = functools.partial(_bgp_verify_nexthop_validity)
success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, 'Nexthops are not valid "{}"'.format(tgen.gears["r4"])
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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