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#!/usr/bin/env python
#
# bgp_tcp_mss.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2021 by
# Abhinay Ramesh <rabhinay@vmware.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.
#
"""
bgp_tcp_mss.py:
Test if works the following commands:
router bgp 65000
neighbor 192.168.255.2 tcp-mss 500
Need to verify if the tcp-mss value is reflected in the TCP session.
"""
import os
import sys
import json
import time
import pytest
import functools
# add after imports, before defining classes or functions:
pytestmark = [pytest.mark.bgpd]
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
pytestmark = [pytest.mark.bgpd]
class TemplateTopo(Topo):
def build(self, *_args, **_opts):
tgen = get_topogen(self)
for routern in range(1, 3):
tgen.add_router("r{}".format(routern))
switch = tgen.add_switch("s1")
switch.add_link(tgen.gears["r1"])
switch.add_link(tgen.gears["r2"])
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_tcp_mss():
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
router1 = tgen.gears["r1"]
router2 = tgen.gears["r2"]
def _bgp_converge(router):
output = json.loads(router.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json"))
expected = {
"192.168.255.2": {
"bgpState": "Established",
"addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 0}},
}
}
return topotest.json_cmp(output, expected)
def _bgp_conf_tcp_mss(router, as_num, neigh):
router.vtysh_cmd(
"""configure terminal
router bgp {0}
neighbor {1} tcp-mss 500""".format(
as_num, neigh
)
)
def _bgp_clear_session(router):
router.vtysh_cmd("clear bgp *")
def _bgp_check_neighbor_tcp_mss(router, neigh):
output = json.loads(router.vtysh_cmd("show bgp neighbor {} json".format(neigh)))
expected = {
"{}".format(neigh): {"bgpTcpMssConfigured": 500, "bgpTcpMssSynced": 488}
}
return topotest.json_cmp(output, expected)
logger.info("Check if neighbor sessions are up in {}".format(router1.name))
test_func = functools.partial(_bgp_converge, router1)
success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5)
assert result is None, 'Failed to see BGP convergence in "{}"'.format(router1.name)
logger.info("BGP neighbor session is up in {}".format(router1.name))
logger.info(
"Configure tcp-mss 500 on {} and reset the session".format(router1.name)
)
_bgp_conf_tcp_mss(router1, "65000", "192.168.255.2")
_bgp_clear_session(router1)
logger.info(
"Configure tcp-mss 500 on {} and reset the session".format(router2.name)
)
_bgp_conf_tcp_mss(router2, "65001", "192.168.255.1")
_bgp_clear_session(router2)
logger.info(
"Check if neighbor session is up after reset in {}".format(router1.name)
)
test_func = functools.partial(_bgp_converge, router1)
success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5)
assert result is None, 'Failed to see BGP convergence after reset in "{}"'.format(
router1.name
)
logger.info(
"Verify if TCP MSS value is synced with neighbor in {}".format(router1.name)
)
test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router1, "192.168.255.2")
success, result = topotest.run_and_expect(test_func, None, count=3, wait=0.5)
assert (
result is None
), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router1.name)
logger.info("TCP MSS value is synced with neighbor in {}".format(router1.name))
logger.info(
"Verify if TCP MSS value is synced with neighbor in {}".format(router2.name)
)
test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router2, "192.168.255.1")
success, result = topotest.run_and_expect(test_func, None, count=3, wait=0.5)
assert (
result is None
), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router2.name)
logger.info("TCP MSS value is synced with neighbor in {}".format(router2.name))
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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