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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
#
# test_bgp_explicitnull.py
#
# Part of NetDEF Topology Tests
#
# Copyright 2023 by 6WIND S.A.
#
"""
test_bgp_lu_explicitnull.py: Test BGP LU label allocation
"""
import os
import sys
import json
import functools
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
pytestmark = [pytest.mark.bgpd]
# Basic scenario for BGP-LU. Nodes are directly connected.
# The 192.168.2.2/32 prefix is advertised from r2 to r1
# The explicit-null label should be used
# The 192.168.2.1/32 prefix is advertised from r1 to r2
# The explicit-null label should be used
# Traffic from 192.168.2.1 to 192.168.2.2 should use explicit-null label
#
# AS65500 BGP-LU AS65501
# +-----+ +-----+
# | |.1 .2| |
# | 1 +----------------+ 2 + 192.168.0.2/32
# | | 192.0.2.0/24 | |
# +-----+ +-----+
def build_topo(tgen):
"Build function"
# Create routers
tgen.add_router("r1")
tgen.add_router("r2")
# r1-r2
switch = tgen.add_switch("s1")
switch.add_link(tgen.gears["r1"])
switch.add_link(tgen.gears["r2"])
# r1
switch = tgen.add_switch("s2")
switch.add_link(tgen.gears["r1"])
# r2
switch = tgen.add_switch("s3")
switch.add_link(tgen.gears["r2"])
def setup_module(mod):
"Sets up the pytest environment"
# This function initiates the topology build with Topogen...
tgen = Topogen(build_topo, mod.__name__)
# Skip if no mpls support
if not tgen.hasmpls:
logger.info("MPLS is not available, skipping test")
pytest.skip("MPLS is not available, skipping")
return
# ... and here it calls Mininet initialization functions.
tgen.start_topology()
# This is a sample of configuration loading.
router_list = tgen.routers()
# Enable mpls input for routers, so we can ping
sval = "net.mpls.conf.{}.input"
topotest.sysctl_assure(router_list["r2"], sval.format("r2-eth0"), 1)
topotest.sysctl_assure(router_list["r1"], sval.format("r1-eth0"), 1)
# For all registred routers, load the zebra configuration file
for rname, router in router_list.items():
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()
def teardown_module(mod):
"Teardown the pytest environment"
tgen = get_topogen()
# This function tears down the whole topology.
tgen.stop_topology()
def check_show_ip_label_prefix_found(router, ipversion, prefix, label):
output = json.loads(
router.vtysh_cmd("show {} route {} json".format(ipversion, prefix))
)
expected = {
prefix: [
{"prefix": prefix, "nexthops": [{"fib": True, "labels": [int(label)]}]}
]
}
return topotest.json_cmp(output, expected)
def test_converge_bgplu():
"Wait for protocol convergence"
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
# tgen.mininet_cli();
r1 = tgen.gears["r1"]
r2 = tgen.gears["r2"]
# Check r1 gets prefix 192.168.2.2/32
test_func = functools.partial(
check_show_ip_label_prefix_found,
tgen.gears["r1"],
"ip",
"192.168.2.2/32",
"0",
)
success, _ = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
assert success, "r1, prefix 192.168.2.2/32 from r2 not present"
# Check r2 gets prefix 192.168.2.1/32
test_func = functools.partial(
check_show_ip_label_prefix_found,
tgen.gears["r2"],
"ip",
"192.168.2.1/32",
"0",
)
success, _ = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
assert success, "r2, prefix 192.168.2.1/32 from r1 not present"
def test_traffic_connectivity():
"Wait for protocol convergence"
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
def _check_ping(name, dest_addr, src_addr):
tgen = get_topogen()
output = tgen.gears[name].run(
"ping {} -c 1 -w 1 -I {}".format(dest_addr, src_addr)
)
logger.info(output)
if " 0% packet loss" not in output:
return True
logger.info("r1, check ping 192.168.2.2 from 192.168.2.1 is OK")
tgen = get_topogen()
func = functools.partial(_check_ping, "r1", "192.168.2.2", "192.168.2.1")
# tgen.mininet_cli()
_, result = topotest.run_and_expect(func, None, count=10, wait=0.5)
assert result is None, "r1, ping to 192.168.2.2 from 192.168.2.1 fails"
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))
|
