OpenStack Networking (Neutron)
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#
# 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.
#
from neutron_lib.api.definitions import dns as dns_apidef
from neutron_lib.api.definitions import external_net
from neutron_lib.api.definitions import portbindings
from neutron_lib.api.definitions import provider_net as pnet
from neutron_lib.api import extensions as api_extensions
from neutron_lib.callbacks import events
from neutron_lib.callbacks import registry
from neutron_lib.callbacks import resources
from neutron_lib import constants as n_const
from neutron_lib import context as n_context
from neutron_lib import exceptions as n_exc
from neutron_lib.exceptions import availability_zone as az_exc
from neutron_lib.plugins import constants as plugin_constants
from neutron_lib.plugins import directory
from neutron_lib.services import base as service_base
from oslo_log import log
from oslo_utils import excutils
from neutron.common.ovn import constants as ovn_const
from neutron.common.ovn import extensions
from neutron.common.ovn import utils
from neutron.common import utils as common_utils
from neutron.db.availability_zone import router as router_az_db
from neutron.db import dns_db
from neutron.db import extraroute_db
from neutron.db import l3_fip_port_details
from neutron.db import l3_fip_qos
from neutron.db import l3_gwmode_db
from neutron.db.models import l3 as l3_models
from neutron.db import ovn_revision_numbers_db as db_rev
from neutron.extensions import qos_fip as qos_fip_api
from neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb import ovn_client
from neutron.quota import resource_registry
from neutron.scheduler import l3_ovn_scheduler
from neutron.services.ovn_l3 import exceptions as ovn_l3_exc
from neutron.services.portforwarding.drivers.ovn import driver \
as port_forwarding
LOG = log.getLogger(__name__)
@registry.has_registry_receivers
class OVNL3RouterPlugin(service_base.ServicePluginBase,
extraroute_db.ExtraRoute_dbonly_mixin,
l3_gwmode_db.L3_NAT_db_mixin,
dns_db.DNSDbMixin,
l3_fip_port_details.Fip_port_details_db_mixin,
router_az_db.RouterAvailabilityZoneMixin,
l3_fip_qos.FloatingQoSDbMixin):
"""Implementation of the OVN L3 Router Service Plugin.
This class implements a L3 service plugin that provides
router and floatingip resources and manages associated
request/response.
"""
# TODO(mjozefcz): Start consuming it from neutron-lib
# once available.
_supported_extension_aliases = (
extensions.ML2_SUPPORTED_API_EXTENSIONS_OVN_L3)
__filter_validation_support = True
@resource_registry.tracked_resources(router=l3_models.Router,
floatingip=l3_models.FloatingIP)
def __init__(self):
LOG.info("Starting OVNL3RouterPlugin")
super(OVNL3RouterPlugin, self).__init__()
self._plugin_property = None
self._mech = None
self._ovn_client_inst = None
self.scheduler = l3_ovn_scheduler.get_scheduler()
self.port_forwarding = port_forwarding.OVNPortForwarding(self)
self._register_precommit_callbacks()
def _register_precommit_callbacks(self):
registry.subscribe(
self.create_router_precommit, resources.ROUTER,
events.PRECOMMIT_CREATE)
registry.subscribe(
self.create_floatingip_precommit, resources.FLOATING_IP,
events.PRECOMMIT_CREATE)
@staticmethod
def disable_qos_fip_extension_by_extension_drivers(aliases):
qos_service_plugin = directory.get_plugin(plugin_constants.QOS)
qos_aliases = qos_fip_api.FIP_QOS_ALIAS in aliases
if not qos_service_plugin and qos_aliases:
aliases.remove(qos_fip_api.FIP_QOS_ALIAS)
@staticmethod
def disable_dns_extension_by_extension_drivers(aliases):
core_plugin = directory.get_plugin()
if not api_extensions.is_extension_supported(
core_plugin, dns_apidef.ALIAS):
aliases.remove(dns_apidef.ALIAS)
@property
def supported_extension_aliases(self):
if not hasattr(self, '_aliases'):
self._aliases = self._supported_extension_aliases[:]
self.disable_qos_fip_extension_by_extension_drivers(self._aliases)
self.disable_dns_extension_by_extension_drivers(self._aliases)
return self._aliases
@property
def _ovn_client(self):
if self._ovn_client_inst is None:
self._ovn_client_inst = ovn_client.OVNClient(self._ovn,
self._sb_ovn)
return self._ovn_client_inst
@property
def _ovn(self):
return self._plugin_driver.nb_ovn
@property
def _sb_ovn(self):
return self._plugin_driver.sb_ovn
@property
def _plugin(self):
if self._plugin_property is None:
self._plugin_property = directory.get_plugin()
return self._plugin_property
@property
def _plugin_driver(self):
if self._mech is None:
drivers = ('ovn', 'ovn-sync')
for driver in drivers:
try:
self._mech = self._plugin.mechanism_manager.mech_drivers[
driver].obj
break
except KeyError:
pass
else:
raise ovn_l3_exc.MechanismDriverNotFound(
mechanism_drivers=drivers)
return self._mech
def get_plugin_type(self):
return plugin_constants.L3
def get_plugin_description(self):
"""returns string description of the plugin."""
return ("L3 Router Service Plugin for basic L3 forwarding"
" using OVN")
def create_router_precommit(self, resource, event, trigger, context,
router, router_id, router_db):
db_rev.create_initial_revision(
context, router_id, ovn_const.TYPE_ROUTERS,
std_attr_id=router_db.standard_attr.id)
def create_router(self, context, router):
router = super(OVNL3RouterPlugin, self).create_router(context, router)
try:
self._ovn_client.create_router(context, router)
except Exception:
with excutils.save_and_reraise_exception():
# Delete the logical router
LOG.error('Unable to create lrouter for %s', router['id'])
super(OVNL3RouterPlugin, self).delete_router(context,
router['id'])
return router
def update_router(self, context, id, router):
original_router = self.get_router(context, id)
result = super(OVNL3RouterPlugin, self).update_router(context, id,
router)
try:
self._ovn_client.update_router(context, result,
original_router)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception('Unable to update lrouter for %s', id)
revert_router = {'router': original_router}
super(OVNL3RouterPlugin, self).update_router(context, id,
revert_router)
return result
def delete_router(self, context, id):
original_router = self.get_router(context, id)
super(OVNL3RouterPlugin, self).delete_router(context, id)
try:
self._ovn_client.delete_router(context, id)
except Exception:
with excutils.save_and_reraise_exception():
super(OVNL3RouterPlugin, self).create_router(
context, {'router': original_router})
def _add_neutron_router_interface(self, context, router_id,
interface_info, may_exist=False):
try:
router_interface_info = (
super(OVNL3RouterPlugin, self).add_router_interface(
context, router_id, interface_info))
except n_exc.PortInUse:
if not may_exist:
raise
# NOTE(lucasagomes): If the port is already being used it means
# the interface has been created already, let's just fetch it from
# the database. Perhaps the code below should live in Neutron
# itself, a get_router_interface() method in the main class
# would be handy
port = self._plugin.get_port(context, interface_info['port_id'])
subnets = [self._plugin.get_subnet(context, s)
for s in utils.get_port_subnet_ids(port)]
router_interface_info = (
self._make_router_interface_info(
router_id, port['tenant_id'], port['id'],
port['network_id'], subnets[0]['id'],
[subnet['id'] for subnet in subnets]))
return router_interface_info
def add_router_interface(self, context, router_id, interface_info=None):
router_interface_info = self._add_neutron_router_interface(
context, router_id, interface_info)
try:
self._ovn_client.create_router_port(
context, router_id, router_interface_info)
except Exception:
with excutils.save_and_reraise_exception():
super(OVNL3RouterPlugin, self).remove_router_interface(
context, router_id, router_interface_info)
return router_interface_info
def remove_router_interface(self, context, router_id, interface_info):
router_interface_info = (
super(OVNL3RouterPlugin, self).remove_router_interface(
context, router_id, interface_info))
try:
port_id = router_interface_info['port_id']
subnet_ids = router_interface_info.get('subnet_ids')
self._ovn_client.delete_router_port(
context, port_id, router_id=router_id, subnet_ids=subnet_ids)
except Exception:
with excutils.save_and_reraise_exception():
super(OVNL3RouterPlugin, self).add_router_interface(
context, router_id, interface_info)
return router_interface_info
def create_floatingip_precommit(self, resource, event, trigger, context,
floatingip, floatingip_id, floatingip_db):
db_rev.create_initial_revision(
context, floatingip_id, ovn_const.TYPE_FLOATINGIPS,
std_attr_id=floatingip_db.standard_attr.id)
def create_floatingip(self, context, floatingip,
initial_status=n_const.FLOATINGIP_STATUS_DOWN):
fip = super(OVNL3RouterPlugin, self).create_floatingip(
context, floatingip, initial_status)
self._ovn_client.create_floatingip(context, fip)
return fip
def delete_floatingip(self, context, id):
super(OVNL3RouterPlugin, self).delete_floatingip(context, id)
self._ovn_client.delete_floatingip(context, id)
def update_floatingip(self, context, id, floatingip):
fip = super(OVNL3RouterPlugin, self).update_floatingip(context, id,
floatingip)
self._ovn_client.update_floatingip(context, fip)
return fip
def update_floatingip_status(self, context, floatingip_id, status):
fip = super(OVNL3RouterPlugin, self).update_floatingip_status(
context, floatingip_id, status)
self._ovn_client.update_floatingip_status(context, fip)
return fip
def disassociate_floatingips(self, context, port_id, do_notify=True):
fips = self.get_floatingips(common_utils.get_elevated_context(context),
filters={'port_id': [port_id]})
router_ids = super(OVNL3RouterPlugin, self).disassociate_floatingips(
context, port_id, do_notify)
for fip in fips:
router_id = fip.get('router_id')
fixed_ip_address = fip.get('fixed_ip_address')
if router_id and fixed_ip_address:
update_fip = {
'id': fip['id'],
'logical_ip': fixed_ip_address,
'external_ip': fip['floating_ip_address'],
'floating_network_id': fip['floating_network_id']}
try:
self._ovn_client.disassociate_floatingip(update_fip,
router_id)
self.update_floatingip_status(
context, fip['id'], n_const.FLOATINGIP_STATUS_DOWN)
except Exception as e:
LOG.error('Error in disassociating floatingip %(id)s: '
'%(error)s', {'id': fip['id'], 'error': e})
return router_ids
def _get_gateway_port_physnet_mapping(self):
# This function returns all gateway ports with corresponding
# external network's physnet
net_physnet_dict = {}
port_physnet_dict = {}
l3plugin = directory.get_plugin(plugin_constants.L3)
if not l3plugin:
return port_physnet_dict
context = n_context.get_admin_context()
for net in l3plugin._plugin.get_networks(
context, {external_net.EXTERNAL: [True]}):
if net.get(pnet.NETWORK_TYPE) in [n_const.TYPE_FLAT,
n_const.TYPE_VLAN]:
net_physnet_dict[net['id']] = net.get(pnet.PHYSICAL_NETWORK)
for port in l3plugin._plugin.get_ports(context, filters={
'device_owner': [n_const.DEVICE_OWNER_ROUTER_GW]}):
port_physnet_dict[port['id']] = net_physnet_dict.get(
port['network_id'])
return port_physnet_dict
def update_router_gateway_port_bindings(self, router, host):
status = (n_const.PORT_STATUS_ACTIVE if host
else n_const.PORT_STATUS_DOWN)
context = n_context.get_admin_context()
filters = {'device_id': [router],
'device_owner': [n_const.DEVICE_OWNER_ROUTER_GW]}
for port in self._plugin.get_ports(context, filters=filters):
# FIXME(lucasagomes): Ideally here we would use only
# one database transaction for the status and binding the
# host but, even tho update_port_status() receives a "host"
# parameter apparently it doesn't work for ports which the
# device owner is router_gateway. We need to look into it and
# fix the problem in Neutron before updating it here.
if host:
self._plugin.update_port(
context, port['id'],
{'port': {portbindings.HOST_ID: host}})
if port['status'] != status:
self._plugin.update_port_status(context, port['id'], status)
def _get_availability_zones_from_router_port(self, lrp_name):
"""Return the availability zones hints for the router port.
Return a list of availability zones hints associated with the
router that the router port belongs to.
"""
context = n_context.get_admin_context()
if not self._plugin_driver.list_availability_zones(context):
return []
lrp = self._ovn.get_lrouter_port(lrp_name)
router = self.get_router(
context, lrp.external_ids[ovn_const.OVN_ROUTER_NAME_EXT_ID_KEY])
az_hints = utils.get_az_hints(router)
return az_hints
def schedule_unhosted_gateways(self, event_from_chassis=None):
# GW ports and its physnets.
port_physnet_dict = self._get_gateway_port_physnet_mapping()
# Filter out unwanted ports in case of event.
if event_from_chassis:
gw_chassis = self._ovn.get_chassis_gateways(
chassis_name=event_from_chassis)
if not gw_chassis:
return
ports_impacted = []
for gwc in gw_chassis:
try:
ports_impacted.append(utils.get_port_id_from_gwc_row(gwc))
except AttributeError:
# Malformed GWC format.
pass
port_physnet_dict = {
k: v
for k, v in port_physnet_dict.items()
if k in ports_impacted}
if not port_physnet_dict:
return
# All chassis with physnets configured.
chassis_with_physnets = self._sb_ovn.get_chassis_and_physnets()
# All chassis with enable_as_gw_chassis set
all_gw_chassis = self._sb_ovn.get_gateway_chassis_from_cms_options()
unhosted_gateways = self._ovn.get_unhosted_gateways(
port_physnet_dict, chassis_with_physnets,
all_gw_chassis)
for g_name in unhosted_gateways:
physnet = port_physnet_dict.get(g_name[len(ovn_const.LRP_PREFIX):])
# Remove any invalid gateway chassis from the list, otherwise
# we can have a situation where all existing_chassis are invalid
existing_chassis = self._ovn.get_gateway_chassis_binding(g_name)
primary = existing_chassis[0] if existing_chassis else None
existing_chassis = self.scheduler.filter_existing_chassis(
nb_idl=self._ovn, gw_chassis=all_gw_chassis,
physnet=physnet, chassis_physnets=chassis_with_physnets,
existing_chassis=existing_chassis)
az_hints = self._get_availability_zones_from_router_port(g_name)
candidates = self._ovn_client.get_candidates_for_scheduling(
physnet, cms=all_gw_chassis,
chassis_physnets=chassis_with_physnets,
availability_zone_hints=az_hints)
chassis = self.scheduler.select(
self._ovn, self._sb_ovn, g_name, candidates=candidates,
existing_chassis=existing_chassis)
if primary and primary != chassis[0]:
if primary not in chassis:
LOG.debug("Primary gateway chassis %(old)s "
"has been removed from the system. Moving "
"gateway %(gw)s to other chassis %(new)s.",
{'gw': g_name,
'old': primary,
'new': chassis[0]})
else:
LOG.debug("Gateway %s is hosted at %s.", g_name, primary)
# NOTE(mjozefcz): It means scheduler moved primary chassis
# to other gw based on scheduling method. But we don't
# want network flap - so moving actual primary to be on
# the top.
index = chassis.index(primary)
chassis[0], chassis[index] = chassis[index], chassis[0]
# NOTE(dalvarez): Let's commit the changes in separate transactions
# as we will rely on those for scheduling subsequent gateways.
with self._ovn.transaction(check_error=True) as txn:
txn.add(self._ovn.update_lrouter_port(
g_name, gateway_chassis=chassis))
@staticmethod
@registry.receives(resources.SUBNET, [events.AFTER_UPDATE])
def _subnet_update(resource, event, trigger, **kwargs):
l3plugin = directory.get_plugin(plugin_constants.L3)
if not l3plugin:
return
context = kwargs['context']
orig = kwargs['original_subnet']
current = kwargs['subnet']
orig_gw_ip = orig['gateway_ip']
current_gw_ip = current['gateway_ip']
if orig_gw_ip == current_gw_ip:
return
gw_ports = l3plugin._plugin.get_ports(context, filters={
'network_id': [orig['network_id']],
'device_owner': [n_const.DEVICE_OWNER_ROUTER_GW],
'fixed_ips': {'subnet_id': [orig['id']]},
})
router_ids = {port['device_id'] for port in gw_ports}
remove = [{'destination': '0.0.0.0/0', 'nexthop': orig_gw_ip}
] if orig_gw_ip else []
add = [{'destination': '0.0.0.0/0', 'nexthop': current_gw_ip}
] if current_gw_ip else []
with l3plugin._ovn.transaction(check_error=True) as txn:
for router_id in router_ids:
l3plugin._ovn_client.update_router_routes(
context, router_id, add, remove, txn=txn)
@staticmethod
@registry.receives(resources.PORT, [events.AFTER_UPDATE])
def _port_update(resource, event, trigger, **kwargs):
l3plugin = directory.get_plugin(plugin_constants.L3)
if not l3plugin:
return
current = kwargs['port']
if utils.is_lsp_router_port(current):
# We call the update_router port with if_exists, because neutron,
# internally creates the port, and then calls update, which will
# trigger this callback even before we had the chance to create
# the OVN NB DB side
l3plugin._ovn_client.update_router_port(kwargs['context'],
current, if_exists=True)
def get_router_availability_zones(self, router):
lr = self._ovn.get_lrouter(router['id'])
if not lr:
return []
return [az.strip() for az in lr.external_ids.get(
ovn_const.OVN_ROUTER_AZ_HINTS_EXT_ID_KEY, '').split(',')
if az.strip()]
def validate_availability_zones(self, context, resource_type,
availability_zones):
"""Verify that the availability zones exist."""
if not availability_zones or resource_type != 'router':
return
azs = {az['name'] for az in
self._plugin_driver.list_availability_zones(context).values()}
diff = set(availability_zones) - azs
if diff:
raise az_exc.AvailabilityZoneNotFound(
availability_zone=', '.join(diff))