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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 json
import unittest
from base_vyostest_shim import VyOSUnitTestSHIM
from netifaces import interfaces
from vyos.configsession import ConfigSession
from vyos.configsession import ConfigSessionError
from vyos.ifconfig import Interface
from vyos.ifconfig import Section
from vyos.template import is_ipv6
from vyos.util import cmd
from vyos.util import read_file
from vyos.validate import is_intf_addr_assigned
base_path = ['vrf']
vrfs = ['red', 'green', 'blue', 'foo-bar', 'baz_foo']
def get_vrf_ipv4_routes(vrf):
return json.loads(cmd(f'ip -4 -j route show vrf {vrf}'))
def get_vrf_ipv6_routes(vrf):
return json.loads(cmd(f'ip -6 -j route show vrf {vrf}'))
class VRFTest(VyOSUnitTestSHIM.TestCase):
_interfaces = []
@classmethod
def setUpClass(cls):
# we need to filter out VLAN interfaces identified by a dot (.)
# in their name - just in case!
if 'TEST_ETH' in os.environ:
tmp = os.environ['TEST_ETH'].split()
cls._interfaces = tmp
else:
for tmp in Section.interfaces('ethernet'):
if not '.' in tmp:
cls._interfaces.append(tmp)
# call base-classes classmethod
super(cls, cls).setUpClass()
def tearDown(self):
# delete all VRFs
self.cli_delete(base_path)
self.cli_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.cli_set(base + ['description', description])
# check validate() - a table ID is mandatory
with self.assertRaises(ConfigSessionError):
self.cli_commit()
self.cli_set(base + ['table', table])
if vrf == 'green':
self.cli_set(base + ['disable'])
table = str(int(table) + 1)
# commit changes
self.cli_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.cli_set(base + ['table', str(table)])
table = str(int(table) + 1)
# commit changes
self.cli_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_bind_all(self):
table = '2000'
for vrf in vrfs:
base = base_path + ['name', vrf]
self.cli_set(base + ['table', str(table)])
table = str(int(table) + 1)
self.cli_set(base_path + ['bind-to-all'])
# commit changes
self.cli_commit()
# Verify VRF configuration
tmp = read_file('/proc/sys/net/ipv4/tcp_l3mdev_accept')
self.assertIn(tmp, '1')
tmp = read_file('/proc/sys/net/ipv4/udp_l3mdev_accept')
self.assertIn(tmp, '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.cli_set(base + ['table', table])
# commit changes
self.cli_commit()
# Check if VRF has been created
self.assertTrue(vrf in interfaces())
table = str(int(table) + 1)
self.cli_set(base + ['table', table])
# check validate() - table ID can not be altered!
with self.assertRaises(ConfigSessionError):
self.cli_commit()
def test_vrf_assign_interface(self):
vrf = vrfs[0]
table = '5000'
self.cli_set(['vrf', 'name', vrf, 'table', table])
for interface in self._interfaces:
section = Section.section(interface)
self.cli_set(['interfaces', section, interface, 'vrf', vrf])
# commit changes
self.cli_commit()
# Verify & cleanup
for interface in self._interfaces:
# os.readlink resolves to: '../../../../../virtual/net/foovrf'
tmp = os.readlink(f'/sys/class/net/{interface}/master').split('/')[-1]
self.assertEqual(tmp, vrf)
# cleanup
section = Section.section(interface)
self.cli_delete(['interfaces', section, interface, 'vrf'])
def test_vrf_static_routes(self):
routes = {
'10.0.0.0/8' : {
'next_hop' : '192.0.2.2',
'distance' : '200',
'next_hop_vrf' : 'default',
},
'172.16.0.0/12' : {
'next_hop' : '192.0.2.3',
'next_hop_vrf' : 'default',
},
'192.168.0.0/16' : {
'next_hop' : '192.0.2.3',
},
'2001:db8:1000::/48' : {
'next_hop' : '2001:db8::2',
},
}
table = '2000'
for vrf in vrfs:
base = base_path + ['name', vrf]
self.cli_set(base + ['table', str(table)])
# required interface for leaking to default table
self.cli_set(['interfaces', 'ethernet', 'eth0', 'address', '192.0.2.1/24'])
# we also need an interface in "UP" state to install routes
self.cli_set(['interfaces', 'dummy', f'dum{table}', 'vrf', vrf])
self.cli_set(['interfaces', 'dummy', f'dum{table}', 'address', '192.0.2.1/24'])
self.cli_set(['interfaces', 'dummy', f'dum{table}', 'address', '2001:db8::1/64'])
table = str(int(table) + 1)
proto_base = ['protocols', 'vrf', vrf, 'static']
for route, route_config in routes.items():
route_type = 'route'
if is_ipv6(route):
route_type = 'route6'
self.cli_set(proto_base + [route_type, route, 'next-hop', route_config['next_hop']])
if 'distance' in route_config:
self.cli_set(proto_base + [route_type, route, 'next-hop', route_config['next_hop'], 'distance', route_config['distance']])
if 'next_hop_vrf' in route_config:
self.cli_set(proto_base + [route_type, route, 'next-hop', route_config['next_hop'], 'next-hop-vrf', route_config['next_hop_vrf']])
# commit changes
self.cli_commit()
# Verify routes
table = '2000'
for vrf in vrfs:
for route, route_config in routes.items():
if is_ipv6(route):
tmp = get_vrf_ipv6_routes(vrf)
else:
tmp = get_vrf_ipv4_routes(vrf)
found = False
for result in tmp:
if 'dst' in result and result['dst'] == route:
if 'gateway' in result and result['gateway'] == route_config['next_hop']:
found = True
self.assertTrue(found)
# Cleanup
self.cli_delete(['protocols', 'vrf', vrf])
self.cli_delete(['interfaces', 'dummy', f'dum{table}'])
self.cli_delete(['interfaces', 'ethernet', 'eth0', 'address', '192.0.2.1/24'])
table = str(int(table) + 1)
if __name__ == '__main__':
unittest.main(verbosity=2)
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