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test_vrf.py
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test_vrf.py
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#!/usr/bin/env python3
#
# Copyright (C) 2020-2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
import os
import unittest
from netifaces import interfaces
from vyos.configsession import ConfigSession
from vyos.configsession import ConfigSessionError
from vyos.util import read_file
from vyos.validate import is_intf_addr_assigned
from vyos.ifconfig import Interface
base_path = ['vrf']
vrfs = ['red', 'green', 'blue', 'foo-bar', 'baz_foo']
class VRFTest(unittest.TestCase):
def setUp(self):
self.session = ConfigSession(os.getpid())
def tearDown(self):
# delete all VRFs
self.session.delete(base_path)
self.session.commit()
for vrf in vrfs:
self.assertNotIn(vrf, interfaces())
def test_vrf_table_id(self):
table = '1000'
for vrf in vrfs:
base = base_path + ['name', vrf]
description = f'VyOS-VRF-{vrf}'
self.session.set(base + ['description', description])
# check validate() - a table ID is mandatory
with self.assertRaises(ConfigSessionError):
self.session.commit()
self.session.set(base + ['table', table])
if vrf == 'green':
self.session.set(base + ['disable'])
table = str(int(table) + 1)
# commit changes
self.session.commit()
# Verify VRF configuration
table = '1000'
iproute2_config = read_file('/etc/iproute2/rt_tables.d/vyos-vrf.conf')
for vrf in vrfs:
description = f'VyOS-VRF-{vrf}'
self.assertTrue(vrf in interfaces())
vrf_if = Interface(vrf)
# validate proper interface description
self.assertEqual(vrf_if.get_alias(), description)
# validate admin up/down state of VRF
state = 'up'
if vrf == 'green':
state = 'down'
self.assertEqual(vrf_if.get_admin_state(), state)
# Test the iproute2 lookup file, syntax is as follows:
#
# # id vrf name comment
# 1000 red # VyOS-VRF-red
# 1001 green # VyOS-VRF-green
# ...
regex = f'{table}\s+{vrf}\s+#\s+{description}'
self.assertTrue(re.findall(regex, iproute2_config))
table = str(int(table) + 1)
def test_vrf_loopback_ips(self):
table = '2000'
for vrf in vrfs:
base = base_path + ['name', vrf]
self.session.set(base + ['table', str(table)])
table = str(int(table) + 1)
# commit changes
self.session.commit()
# Verify VRF configuration
for vrf in vrfs:
self.assertTrue(vrf in interfaces())
self.assertTrue(is_intf_addr_assigned(vrf, '127.0.0.1'))
self.assertTrue(is_intf_addr_assigned(vrf, '::1'))
def test_vrf_table_id_is_unalterable(self):
# Linux Kernel prohibits the change of a VRF table on the fly.
# VRF must be deleted and recreated!
table = '1000'
vrf = vrfs[0]
base = base_path + ['name', vrf]
self.session.set(base + ['table', table])
# commit changes
self.session.commit()
# Check if VRF has been created
self.assertTrue(vrf in interfaces())
table = str(int(table) + 1)
self.session.set(base + ['table', table])
# check validate() - table ID can not be altered!
with self.assertRaises(ConfigSessionError):
self.session.commit()
if __name__ == '__main__':
unittest.main(verbosity=2, failfast=True)

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