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neutron/neutron/tests/functional/agent/test_dhcp_agent.py

400 lines
17 KiB

# Copyright (c) 2015 Red Hat, Inc.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import copy
import os.path
import eventlet
import fixtures
import mock
import netaddr
from neutron_lib import constants as lib_const
from oslo_config import fixture as fixture_config
from oslo_utils import uuidutils
from neutron.agent.common import ovs_lib
from neutron.agent.dhcp import agent
from neutron.agent import dhcp_agent
from neutron.agent.linux import dhcp
from neutron.agent.linux import external_process
from neutron.agent.linux import interface
from neutron.agent.linux import ip_lib
from neutron.agent.linux import utils
from neutron.common import utils as common_utils
from neutron.conf.agent import common as config
from neutron.tests.common import net_helpers
from neutron.tests.functional.agent.linux import helpers
from neutron.tests.functional import base
class DHCPAgentOVSTestFramework(base.BaseSudoTestCase):
_DHCP_PORT_MAC_ADDRESS = netaddr.EUI("24:77:03:7d:00:4c")
_DHCP_PORT_MAC_ADDRESS.dialect = netaddr.mac_unix
_TENANT_PORT_MAC_ADDRESS = netaddr.EUI("24:77:03:7d:00:3a")
_TENANT_PORT_MAC_ADDRESS.dialect = netaddr.mac_unix
_IP_ADDRS = {
4: {'addr': '192.168.10.11',
'cidr': '192.168.10.0/24',
'gateway': '192.168.10.1'},
6: {'addr': '2001:db8:0:1::c0a8:a0b',
'cidr': '2001:db8:0:1::c0a8:a00/120',
'gateway': '2001:db8:0:1::c0a8:a01'}, }
def setUp(self):
super(DHCPAgentOVSTestFramework, self).setUp()
config.setup_logging()
self.conf_fixture = self.useFixture(fixture_config.Config())
self.conf = self.conf_fixture.conf
dhcp_agent.register_options(self.conf)
# NOTE(cbrandily): TempDir fixture creates a folder with 0o700
# permissions but agent dir must be readable by dnsmasq user (nobody)
agent_config_dir = self.useFixture(fixtures.TempDir()).path
self.useFixture(
helpers.RecursivePermDirFixture(agent_config_dir, 0o555))
self.conf.set_override("dhcp_confs", agent_config_dir)
self.conf.set_override(
'interface_driver',
'neutron.agent.linux.interface.OVSInterfaceDriver')
self.conf.set_override('report_interval', 0, 'AGENT')
br_int = self.useFixture(net_helpers.OVSBridgeFixture()).bridge
self.conf.set_override('ovs_integration_bridge', br_int.br_name)
self.mock_plugin_api = mock.patch(
'neutron.agent.dhcp.agent.DhcpPluginApi').start().return_value
mock.patch('neutron.agent.rpc.PluginReportStateAPI').start()
self.agent = agent.DhcpAgentWithStateReport('localhost')
self.ovs_driver = interface.OVSInterfaceDriver(self.conf)
self.conf.set_override('check_child_processes_interval', 1, 'AGENT')
def network_dict_for_dhcp(self, dhcp_enabled=True, ip_version=4,
prefix_override=None):
net_id = uuidutils.generate_uuid()
subnet_dict = self.create_subnet_dict(
net_id, dhcp_enabled, ip_version, prefix_override)
port_dict = self.create_port_dict(
net_id, subnet_dict.id,
mac_address=str(self._DHCP_PORT_MAC_ADDRESS),
ip_version=ip_version)
port_dict.device_id = common_utils.get_dhcp_agent_device_id(
net_id, self.conf.host)
net_dict = self.create_network_dict(
net_id, [subnet_dict], [port_dict])
return net_dict
def create_subnet_dict(self, net_id, dhcp_enabled=True, ip_version=4,
prefix_override=None):
cidr = self._IP_ADDRS[ip_version]['cidr']
if prefix_override is not None:
cidr = '/'.join((cidr.split('/')[0], str(prefix_override)))
sn_dict = dhcp.DictModel({
"id": uuidutils.generate_uuid(),
"network_id": net_id,
"ip_version": ip_version,
"cidr": cidr,
"gateway_ip": (self.
_IP_ADDRS[ip_version]['gateway']),
"enable_dhcp": dhcp_enabled,
"dns_nameservers": [],
"host_routes": [],
"ipv6_ra_mode": None,
"ipv6_address_mode": None})
if ip_version == 6:
sn_dict['ipv6_address_mode'] = lib_const.DHCPV6_STATEFUL
return sn_dict
def create_port_dict(self, network_id, subnet_id, mac_address,
ip_version=4, ip_address=None):
ip_address = (self._IP_ADDRS[ip_version]['addr']
if not ip_address else ip_address)
port_dict = dhcp.DictModel({
"id": uuidutils.generate_uuid(),
"name": "foo",
"mac_address": mac_address,
"network_id": network_id,
"admin_state_up": True,
"device_id": uuidutils.generate_uuid(),
"device_owner": "foo",
"fixed_ips": [{"subnet_id": subnet_id,
"ip_address": ip_address}], })
return port_dict
def create_network_dict(self, net_id, subnets=None, ports=None,
non_local_subnets=None):
subnets = [] if not subnets else subnets
ports = [] if not ports else ports
non_local_subnets = [] if not non_local_subnets else non_local_subnets
net_dict = dhcp.NetModel(d={
"id": net_id,
"subnets": subnets,
"non_local_subnets": non_local_subnets,
"ports": ports,
"admin_state_up": True,
"tenant_id": uuidutils.generate_uuid(), })
return net_dict
def get_interface_name(self, network, port):
device_manager = dhcp.DeviceManager(conf=self.conf, plugin=mock.Mock())
return device_manager.get_interface_name(network, port)
def configure_dhcp_for_network(self, network, dhcp_enabled=True):
self.agent.configure_dhcp_for_network(network)
self.addCleanup(self._cleanup_network, network, dhcp_enabled)
def _cleanup_network(self, network, dhcp_enabled):
self.mock_plugin_api.release_dhcp_port.return_value = None
if dhcp_enabled:
self.agent.call_driver('disable', network)
def assert_dhcp_resources(self, network, dhcp_enabled):
ovs = ovs_lib.BaseOVS()
port = network.ports[0]
iface_name = self.get_interface_name(network, port)
self.assertEqual(dhcp_enabled, ovs.port_exists(iface_name))
self.assert_dhcp_namespace(network.namespace, dhcp_enabled)
self.assert_accept_ra_disabled(network.namespace)
self.assert_dhcp_device(network.namespace, iface_name, dhcp_enabled)
def assert_dhcp_namespace(self, namespace, dhcp_enabled):
ip = ip_lib.IPWrapper()
self.assertEqual(dhcp_enabled, ip.netns.exists(namespace))
def assert_accept_ra_disabled(self, namespace):
actual = ip_lib.IPWrapper(namespace=namespace).netns.execute(
['sysctl', '-b', 'net.ipv6.conf.default.accept_ra'])
self.assertEqual('0', actual)
def assert_dhcp_device(self, namespace, dhcp_iface_name, dhcp_enabled):
dev = ip_lib.IPDevice(dhcp_iface_name, namespace)
self.assertEqual(dhcp_enabled, ip_lib.device_exists(
dhcp_iface_name, namespace))
if dhcp_enabled:
self.assertEqual(self._DHCP_PORT_MAC_ADDRESS, dev.link.address)
def _plug_port_for_dhcp_request(self, network, port):
namespace = network.namespace
vif_name = self.get_interface_name(network.id, port)
self.ovs_driver.plug(network.id, port.id, vif_name, port.mac_address,
self.conf['ovs_integration_bridge'],
namespace=namespace)
def _ip_list_for_vif(self, vif_name, namespace):
ip_device = ip_lib.IPDevice(vif_name, namespace)
return ip_device.addr.list(ip_version=4)
def _get_network_port_for_allocation_test(self):
network = self.network_dict_for_dhcp()
ip_addr = netaddr.IPNetwork(network.subnets[0].cidr)[1]
port = self.create_port_dict(
network.id, network.subnets[0].id,
mac_address=str(self._TENANT_PORT_MAC_ADDRESS),
ip_address=str(ip_addr))
return network, port
def assert_good_allocation_for_port(self, network, port):
vif_name = self.get_interface_name(network.id, port)
self._run_dhclient(vif_name, network)
predicate = lambda: len(
self._ip_list_for_vif(vif_name, network.namespace))
common_utils.wait_until_true(predicate, 10)
ip_list = self._ip_list_for_vif(vif_name, network.namespace)
cidr = ip_list[0].get('cidr')
ip_addr = str(netaddr.IPNetwork(cidr).ip)
self.assertEqual(port.fixed_ips[0].ip_address, ip_addr)
def assert_bad_allocation_for_port(self, network, port):
vif_name = self.get_interface_name(network.id, port)
self._run_dhclient(vif_name, network)
# we need wait some time (10 seconds is enough) and check
# that dhclient not configured ip-address for interface
eventlet.sleep(10)
ip_list = self._ip_list_for_vif(vif_name, network.namespace)
self.assertEqual([], ip_list)
def _run_dhclient(self, vif_name, network):
# NOTE: Before run dhclient we should create resolv.conf file
# in namespace, where we will run dhclient for testing address
# allocation for port, otherwise, dhclient will override
# system /etc/resolv.conf
# By default, folder for dhcp-agent's namespace doesn't exist
# that's why we use AdminDirFixture for create directory
# with admin permissions in /etc/netns/ and touch resolv.conf in it.
etc_dir = '/etc/netns/%s' % network.namespace
self.useFixture(helpers.AdminDirFixture(etc_dir))
cmd = ['touch', os.path.join(etc_dir, 'resolv.conf')]
utils.execute(cmd, run_as_root=True)
dhclient_cmd = ['dhclient', '--no-pid', '-d', '-1', vif_name]
proc = net_helpers.RootHelperProcess(
cmd=dhclient_cmd, namespace=network.namespace)
self.addCleanup(proc.wait)
self.addCleanup(proc.kill)
def _get_metadata_proxy_process(self, network):
return external_process.ProcessManager(
self.conf,
network.id,
network.namespace)
class DHCPAgentOVSTestCase(DHCPAgentOVSTestFramework):
def test_create_subnet_with_dhcp(self):
dhcp_enabled = True
for version in [4, 6]:
network = self.network_dict_for_dhcp(
dhcp_enabled, ip_version=version)
self.configure_dhcp_for_network(network=network,
dhcp_enabled=dhcp_enabled)
self.assert_dhcp_resources(network, dhcp_enabled)
def test_create_subnet_with_non64_ipv6_cidrs(self):
# the agent should not throw exceptions on weird prefixes
dhcp_enabled = True
version = 6
for i in (0, 1, 41, 81, 121, 127, 128):
network = self.network_dict_for_dhcp(
dhcp_enabled, ip_version=version, prefix_override=i)
self.configure_dhcp_for_network(network=network,
dhcp_enabled=dhcp_enabled)
self.assertFalse(self.agent.needs_resync_reasons[network.id],
msg="prefix size of %s triggered resync" % i)
def test_agent_mtu_set_on_interface_driver(self):
network = self.network_dict_for_dhcp()
network["mtu"] = 789
self.configure_dhcp_for_network(network=network)
port = network.ports[0]
iface_name = self.get_interface_name(network, port)
dev = ip_lib.IPDevice(iface_name, network.namespace)
self.assertEqual(789, dev.link.mtu)
def test_good_address_allocation(self):
network, port = self._get_network_port_for_allocation_test()
network.ports.append(port)
self.configure_dhcp_for_network(network=network)
self._plug_port_for_dhcp_request(network, port)
self.assert_good_allocation_for_port(network, port)
def test_bad_address_allocation(self):
network, port = self._get_network_port_for_allocation_test()
network.ports.append(port)
self.configure_dhcp_for_network(network=network)
bad_mac_address = netaddr.EUI(self._TENANT_PORT_MAC_ADDRESS.value + 1)
bad_mac_address.dialect = netaddr.mac_unix
port.mac_address = str(bad_mac_address)
self._plug_port_for_dhcp_request(network, port)
self.assert_bad_allocation_for_port(network, port)
def _spawn_network_metadata_proxy(self):
network = self.network_dict_for_dhcp()
self.conf.set_override('enable_isolated_metadata', True)
self.addCleanup(self.agent.disable_isolated_metadata_proxy, network)
self.configure_dhcp_for_network(network=network)
pm = self._get_metadata_proxy_process(network)
common_utils.wait_until_true(
lambda: pm.active,
timeout=5,
sleep=0.01,
exception=RuntimeError("Metadata proxy didn't spawn"))
return (pm, network)
def test_metadata_proxy_respawned(self):
pm, network = self._spawn_network_metadata_proxy()
old_pid = pm.pid
utils.execute(['kill', '-9', old_pid], run_as_root=True)
common_utils.wait_until_true(
lambda: pm.active and pm.pid != old_pid,
timeout=5,
sleep=0.1,
exception=RuntimeError("Metadata proxy didn't respawn"))
def test_stale_metadata_proxy_killed(self):
pm, network = self._spawn_network_metadata_proxy()
self.conf.set_override('enable_isolated_metadata', False)
self.configure_dhcp_for_network(network=network)
common_utils.wait_until_true(
lambda: not pm.active,
timeout=5,
sleep=0.1,
exception=RuntimeError("Stale metadata proxy didn't get killed"))
def _test_metadata_proxy_spawn_kill_with_subnet_create_delete(self):
network = self.network_dict_for_dhcp(ip_version=6)
self.configure_dhcp_for_network(network=network)
pm = self._get_metadata_proxy_process(network)
# A newly created network with ipv6 subnet will not have metadata proxy
self.assertFalse(pm.active)
new_network = copy.deepcopy(network)
dhcp_enabled_ipv4_subnet = self.create_subnet_dict(network.id)
new_network.subnets.append(dhcp_enabled_ipv4_subnet)
self.mock_plugin_api.get_network_info.return_value = new_network
self.agent.refresh_dhcp_helper(network.id)
# Metadata proxy should be spawned for the newly added subnet
common_utils.wait_until_true(
lambda: pm.active,
timeout=5,
sleep=0.1,
exception=RuntimeError("Metadata proxy didn't spawn"))
self.mock_plugin_api.get_network_info.return_value = network
self.agent.refresh_dhcp_helper(network.id)
# Metadata proxy should be killed because network doesn't need it.
common_utils.wait_until_true(
lambda: not pm.active,
timeout=5,
sleep=0.1,
exception=RuntimeError("Metadata proxy didn't get killed"))
def test_enable_isolated_metadata_for_subnet_create_delete(self):
self.conf.set_override('force_metadata', False)
self.conf.set_override('enable_isolated_metadata', True)
self._test_metadata_proxy_spawn_kill_with_subnet_create_delete()
def test_force_metadata_for_subnet_create_delete(self):
self.conf.set_override('force_metadata', True)
self.conf.set_override('enable_isolated_metadata', False)
self._test_metadata_proxy_spawn_kill_with_subnet_create_delete()
def test_notify_port_ready_after_enable_dhcp(self):
network = self.network_dict_for_dhcp()
dhcp_port = self.create_port_dict(
network.id, network.subnets[0].id,
'24:77:03:7d:00:4d', ip_address='192.168.10.11')
dhcp_port.device_owner = lib_const.DEVICE_OWNER_DHCP
network.ports.append(dhcp_port)
self.agent.start_ready_ports_loop()
self.configure_dhcp_for_network(network)
ports_to_send = {p.id for p in network.ports}
common_utils.wait_until_true(
lambda: self.mock_plugin_api.dhcp_ready_on_ports.called,
timeout=1,
sleep=0.1,
exception=RuntimeError("'dhcp_ready_on_ports' not be called"))
self.mock_plugin_api.dhcp_ready_on_ports.assert_called_with(
ports_to_send)