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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# test_bfd_vrf_topo1.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2018 by
# Network Device Education Foundation, Inc. ("NetDEF")
# Copyright (c) 2019 by 6WIND
#
"""
test_bfd_vrf_topo1.py: Test the FRR BFD daemon.
"""
import os
import sys
import json
from functools import partial
import pytest
# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
# Import topogen and topotest helpers
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.topolog import logger
# Required to instantiate the topology builder class.
pytestmark = [pytest.mark.bfdd, pytest.mark.bgpd]
def build_topo(tgen):
# Create 4 routers
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):
"Sets up the pytest environment"
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
# check for zebra capability
for rname, router in router_list.items():
if router.check_capability(TopoRouter.RD_ZEBRA, "--vrfwnetns") == False:
return pytest.skip(
"Skipping BFD Topo1 VRF NETNS feature. VRF NETNS backend not available on FRR"
)
if os.system("ip netns list") != 0:
return pytest.skip(
"Skipping BFD Topo1 VRF NETNS Test. NETNS not available on System"
)
logger.info("Testing with VRF Namespace support")
for rname, router in router_list.items():
# create VRF rx-bfd-cust1 and link rx-eth0 to rx-bfd-cust1
ns = "{}-bfd-cust1".format(rname)
router.net.add_netns(ns)
router.net.set_intf_netns(rname + "-eth0", ns, up=True)
if rname == "r2":
router.net.set_intf_netns(rname + "-eth1", ns, up=True)
router.net.set_intf_netns(rname + "-eth2", ns, up=True)
for rname, router in router_list.items():
router.load_config(
TopoRouter.RD_ZEBRA,
os.path.join(CWD, "{}/zebra.conf".format(rname)),
"--vrfwnetns",
)
router.load_config(
TopoRouter.RD_BFD, os.path.join(CWD, "{}/bfdd.conf".format(rname))
)
router.load_config(
TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
)
# Initialize all routers.
tgen.start_router()
def teardown_module(_mod):
"Teardown the pytest environment"
tgen = get_topogen()
# Move interfaces out of vrf namespace and delete the namespace
router_list = tgen.routers()
for rname, router in router_list.items():
if rname == "r2":
router.net.reset_intf_netns(rname + "-eth2")
router.net.reset_intf_netns(rname + "-eth1")
router.net.reset_intf_netns(rname + "-eth0")
router.net.delete_netns("{}-bfd-cust1".format(rname))
tgen.stop_topology()
def test_bfd_connection():
"Assert that the BFD peers can find themselves."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for bfd peers to go up")
for router in tgen.routers().values():
json_file = "{}/{}/peers.json".format(CWD, router.name)
expected = json.loads(open(json_file).read())
test_func = partial(
topotest.router_json_cmp, router, "show bfd peers json", expected
)
_, result = topotest.run_and_expect(test_func, None, count=16, wait=1)
assertmsg = '"{}" JSON output mismatches'.format(router.name)
assert result is None, assertmsg
def test_bgp_convergence():
"Assert that BGP is converging."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for bgp peers to go up")
for router in tgen.routers().values():
ref_file = "{}/{}/bgp_summary.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
test_func = partial(
topotest.router_json_cmp,
router,
"show ip bgp vrf {}-bfd-cust1 summary json".format(router.name),
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=125, wait=1.0)
assertmsg = "{}: bgp did not converge".format(router.name)
assert res is None, assertmsg
def test_bgp_fast_convergence():
"Assert that BGP is converging before setting a link down."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for bgp peers converge")
for router in tgen.routers().values():
ref_file = "{}/{}/bgp_prefixes.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
test_func = partial(
topotest.router_json_cmp,
router,
"show ip bgp vrf {}-bfd-cust1 json".format(router.name),
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=40, wait=1)
assertmsg = "{}: bgp did not converge".format(router.name)
assert res is None, assertmsg
def test_bfd_fast_convergence():
"""
Assert that BFD notices the link down after simulating network
failure.
"""
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
# Disable r2-eth0 link
router2 = tgen.gears["r2"]
topotest.interface_set_status(
router2, "r2-eth0", ifaceaction=False, vrf_name="r2-bfd-cust1"
)
# Wait the minimum time we can before checking that BGP/BFD
# converged.
logger.info("waiting for BFD converge")
# Check that BGP converged quickly.
for router in tgen.routers().values():
json_file = "{}/{}/peers.json".format(CWD, router.name)
expected = json.loads(open(json_file).read())
# Load the same file as previous test, but expect R1 to be down.
if router.name == "r1":
for peer in expected:
if peer["peer"] == "192.168.0.2":
peer["status"] = "down"
else:
for peer in expected:
if peer["peer"] == "192.168.0.1":
peer["status"] = "down"
test_func = partial(
topotest.router_json_cmp, router, "show bfd peers json", expected
)
_, res = topotest.run_and_expect(test_func, None, count=40, wait=1)
assertmsg = '"{}" JSON output mismatches'.format(router.name)
assert res is None, assertmsg
def test_bgp_fast_reconvergence():
"Assert that BGP is converging after setting a link down."
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
logger.info("waiting for BGP re convergence")
# Check that BGP converged quickly.
for router in tgen.routers().values():
ref_file = "{}/{}/bgp_prefixes.json".format(CWD, router.name)
expected = json.loads(open(ref_file).read())
# Load the same file as previous test, but set networks to None
# to test absence.
if router.name == "r1":
expected["routes"]["10.254.254.2/32"] = None
expected["routes"]["10.254.254.3/32"] = None
expected["routes"]["10.254.254.4/32"] = None
else:
expected["routes"]["10.254.254.1/32"] = None
test_func = partial(
topotest.router_json_cmp,
router,
"show ip bgp vrf {}-bfd-cust1 json".format(router.name),
expected,
)
_, res = topotest.run_and_expect(test_func, None, count=16, wait=1)
assertmsg = "{}: bgp did not converge".format(router.name)
assert res is None, assertmsg
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))
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