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#!/usr/bin/env python
# SPDX-License-Identifier: ISC
# Copyright (c) 2021 by
# Donatas Abraitis <donatas.abraitis@gmail.com>
#
"""
Test if AddPath RX direction is not negotiated via AddPath capability.
"""
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.add_link(tgen.gears["r4"])
def setup_module(mod):
tgen = Topogen(build_topo, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
for _, (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_disable_addpath_rx():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
r1 = tgen.gears["r1"]
r2 = tgen.gears["r2"]
step(
"Check if r2 advertised only 2 paths to r1 (despite addpath-tx-all-paths enabled on r2)."
)
def check_bgp_advertised_routes(router):
output = json.loads(
router.vtysh_cmd(
"show bgp ipv4 unicast neighbor 192.168.1.1 advertised-routes json"
)
)
expected = {
"advertisedRoutes": {
"172.16.16.254/32": {
"addrPrefix": "172.16.16.254",
"prefixLen": 32,
},
"192.168.2.0/24": {
"addrPrefix": "192.168.2.0",
"prefixLen": 24,
},
},
"totalPrefixCounter": 2,
}
return topotest.json_cmp(output, expected)
test_func = functools.partial(check_bgp_advertised_routes, r2)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "AddPath TX not working."
step("Check if AddPath RX is disabled on r1 and we receive only 2 paths.")
def check_bgp_disabled_addpath_rx(router):
output = json.loads(router.vtysh_cmd("show bgp neighbor 192.168.1.2 json"))
expected = {
"192.168.1.2": {
"bgpState": "Established",
"neighborCapabilities": {
"addPath": {
"ipv4Unicast": {"txReceived": True, "rxReceived": True}
},
},
"addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 2}},
}
}
return topotest.json_cmp(output, expected)
test_func = functools.partial(check_bgp_disabled_addpath_rx, r1)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
assert result is None, "AddPath RX advertised, but should not."
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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