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# Copyright (c) 2013 OpenStack Foundation
# 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
# 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 sys
from neutron_lib import constants as p_const
from neutron_lib import context
from neutron_lib.db import api as db_api
from neutron_lib import exceptions as exc
from neutron_lib.plugins import constants as plugin_constants
from neutron_lib.plugins import directory
from neutron_lib.plugins.ml2 import api
from neutron_lib.plugins import utils as plugin_utils
from oslo_config import cfg
from oslo_log import log
from oslo_utils import uuidutils
from six import moves
from neutron._i18n import _
from neutron.conf.plugins.ml2.drivers import driver_type
from neutron.db.models.plugins.ml2 import vlanallocation as vlan_alloc_model
from neutron.objects import network_segment_range as range_obj
from neutron.objects.plugins.ml2 import vlanallocation as vlanalloc
from neutron.plugins.ml2.drivers import helpers
from import plugin as range_plugin
LOG = log.getLogger(__name__)
class VlanTypeDriver(helpers.SegmentTypeDriver):
"""Manage state for VLAN networks with ML2.
The VlanTypeDriver implements the 'vlan' network_type. VLAN
network segments provide connectivity between VMs and other
devices using any connected IEEE 802.1Q conformant
physical_network segmented into virtual networks via IEEE 802.1Q
headers. Up to 4094 VLAN network segments can exist on each
available physical_network.
def __init__(self):
super(VlanTypeDriver, self).__init__(vlanalloc.VlanAllocation)
self.model_segmentation_id = vlan_alloc_model.VlanAllocation.vlan_id
def _populate_new_default_network_segment_ranges(self):
ctx = context.get_admin_context()
for (physical_network, vlan_ranges) in (
for vlan_min, vlan_max in vlan_ranges:
res = {
'id': uuidutils.generate_uuid(),
'name': '',
'default': True,
'shared': True,
'network_type': p_const.TYPE_VLAN,
'physical_network': physical_network,
'minimum': vlan_min,
'maximum': vlan_max}
with db_api.CONTEXT_WRITER.using(ctx):
new_default_range_obj = (
range_obj.NetworkSegmentRange(ctx, **res))
def _delete_expired_default_network_segment_ranges(self):
ctx = context.get_admin_context()
with db_api.CONTEXT_WRITER.using(ctx):
filters = {
'default': True,
'network_type': p_const.TYPE_VLAN,
old_default_range_objs = range_obj.NetworkSegmentRange.get_objects(
ctx, **filters)
for obj in old_default_range_objs:
def _parse_network_vlan_ranges(self):
self.network_vlan_ranges = plugin_utils.parse_network_vlan_ranges(
except Exception:
LOG.exception("Failed to parse network_vlan_ranges. "
"Service terminated!")
sys.exit(1)"Network VLAN ranges: %s", self.network_vlan_ranges)
def _sync_vlan_allocations(self):
ctx = context.get_admin_context()
with db_api.CONTEXT_WRITER.using(ctx):
# get existing allocations for all physical networks
allocations = dict()
allocs = vlanalloc.VlanAllocation.get_objects(ctx)
for alloc in allocs:
if alloc.physical_network not in allocations:
allocations[alloc.physical_network] = list()
# process vlan ranges for each configured physical network
ranges = self.get_network_segment_ranges()
for (physical_network,
vlan_ranges) in ranges.items():
# determine current configured allocatable vlans for
# this physical network
vlan_ids = set()
for vlan_min, vlan_max in vlan_ranges:
vlan_ids |= set(moves.range(vlan_min, vlan_max + 1))
# remove from table unallocated vlans not currently
# allocatable
if physical_network in allocations:
for alloc in allocations[physical_network]:
# see if vlan is allocatable
except KeyError:
# it's not allocatable, so check if its allocated
if not alloc.allocated:
# it's not, so remove it from table
LOG.debug("Removing vlan %(vlan_id)s on "
"physical network "
"%(physical_network)s from pool",
{'vlan_id': alloc.vlan_id,
# This UPDATE WHERE statement blocks anyone
# from concurrently changing the allocation
# values to True while our transaction is
# open so we don't accidentally delete
# allocated segments. If someone has already
# allocated, update_objects will return 0 so we
# don't delete.
if vlanalloc.VlanAllocation.update_objects(
ctx, values={'allocated': False},
allocated=False, vlan_id=alloc.vlan_id,
del allocations[physical_network]
# add missing allocatable vlans to table
for vlan_id in sorted(vlan_ids):
alloc = vlanalloc.VlanAllocation(
vlan_id=vlan_id, allocated=False)
# remove from table unallocated vlans for any unconfigured
# physical networks
for allocs in allocations.values():
for alloc in allocs:
if not alloc.allocated:
LOG.debug("Removing vlan %(vlan_id)s on physical "
"network %(physical_network)s from pool",
{'vlan_id': alloc.vlan_id,
def _get_network_segment_ranges_from_db(self):
ranges = {}
ctx = context.get_admin_context()
with db_api.CONTEXT_READER.using(ctx):
range_objs = (range_obj.NetworkSegmentRange.get_objects(
ctx, network_type=self.get_type()))
for obj in range_objs:
physical_network = obj['physical_network']
if physical_network not in ranges:
ranges[physical_network] = []
return ranges
def get_type(self):
return p_const.TYPE_VLAN
def initialize(self):
if not range_plugin.is_network_segment_range_enabled():
# service plugins are initialized/loaded after the ML2 driver
# initialization. Thus, we base on the information whether
# ``network_segment_range`` service plugin is enabled/defined in
# ``neutron.conf`` to decide whether to skip the first time sync
# allocation during driver initialization, instead of using the
# directory.get_plugin() method - the normal way used elsewhere to
# check if a plugin is loaded.
self._sync_vlan_allocations()"VlanTypeDriver initialization complete")
def initialize_network_segment_range_support(self):
# Override self.network_vlan_ranges with the network segment range
# information from DB and then do a sync_allocations since the
# segment range service plugin has not yet been loaded at this
# initialization time.
self.network_vlan_ranges = self._get_network_segment_ranges_from_db()
def update_network_segment_range_allocations(self):
def get_network_segment_ranges(self):
"""Get the driver network segment ranges.
Queries all VLAN network segment ranges from DB if the
``NETWORK_SEGMENT_RANGE`` service plugin is enabled. Otherwise,
they will be loaded from the host config file - `ml2_conf.ini`.
ranges = self.network_vlan_ranges
if directory.get_plugin(plugin_constants.NETWORK_SEGMENT_RANGE):
ranges = self._get_network_segment_ranges_from_db()
return ranges
def is_partial_segment(self, segment):
return segment.get(api.SEGMENTATION_ID) is None
def validate_provider_segment(self, segment):
physical_network = segment.get(api.PHYSICAL_NETWORK)
segmentation_id = segment.get(api.SEGMENTATION_ID)
ranges = self.get_network_segment_ranges()
if physical_network:
if physical_network not in ranges:
msg = (_("physical_network '%s' unknown "
"for VLAN provider network") % physical_network)
raise exc.InvalidInput(error_message=msg)
if segmentation_id:
if not plugin_utils.is_valid_vlan_tag(segmentation_id):
msg = (_("segmentation_id out of range (%(min)s through "
"%(max)s)") %
{'min': p_const.MIN_VLAN_TAG,
'max': p_const.MAX_VLAN_TAG})
raise exc.InvalidInput(error_message=msg)
if not ranges.get(physical_network):
msg = (_("Physical network %s requires segmentation_id "
"to be specified when creating a provider "
"network") % physical_network)
raise exc.InvalidInput(error_message=msg)
elif segmentation_id:
msg = _("segmentation_id requires physical_network for VLAN "
"provider network")
raise exc.InvalidInput(error_message=msg)
for key, value in segment.items():
if value and key not in [api.NETWORK_TYPE,
msg = _("%s prohibited for VLAN provider network") % key
raise exc.InvalidInput(error_message=msg)
def reserve_provider_segment(self, context, segment, filters=None):
filters = filters or {}
project_id = filters.get('project_id')
filters = {}
physical_network = segment.get(api.PHYSICAL_NETWORK)
if physical_network is not None:
filters['physical_network'] = physical_network
vlan_id = segment.get(api.SEGMENTATION_ID)
if vlan_id is not None:
filters['vlan_id'] = vlan_id
if self.is_partial_segment(segment):
if (directory.get_plugin(
plugin_constants.NETWORK_SEGMENT_RANGE)and project_id):
filters['project_id'] = project_id
alloc = self.allocate_partially_specified_segment(
context, **filters)
if not alloc:
raise exc.NoNetworkAvailable()
alloc = self.allocate_fully_specified_segment(
context, **filters)
if not alloc:
raise exc.VlanIdInUse(**filters)
return {api.NETWORK_TYPE: p_const.TYPE_VLAN,
api.PHYSICAL_NETWORK: alloc.physical_network,
api.SEGMENTATION_ID: alloc.vlan_id,
api.MTU: self.get_mtu(alloc.physical_network)}
def allocate_tenant_segment(self, context, filters=None):
filters = filters or {}
ranges = self.get_network_segment_ranges()
for physnet in ranges:
filters['physical_network'] = physnet
alloc = self.allocate_partially_specified_segment(
context, **filters)
if alloc:
return {api.NETWORK_TYPE: p_const.TYPE_VLAN,
api.PHYSICAL_NETWORK: alloc.physical_network,
api.SEGMENTATION_ID: alloc.vlan_id,
api.MTU: self.get_mtu(alloc.physical_network)}
def release_segment(self, context, segment):
physical_network = segment[api.PHYSICAL_NETWORK]
vlan_id = segment[api.SEGMENTATION_ID]
vlan_ranges = self.get_network_segment_ranges()
ranges = vlan_ranges.get(physical_network, [])
inside = any(lo <= vlan_id <= hi for lo, hi in ranges)
count = False
with db_api.CONTEXT_WRITER.using(context):
alloc = vlanalloc.VlanAllocation.get_object(
context, physical_network=physical_network, vlan_id=vlan_id)
if alloc:
if inside and alloc.allocated:
count = True
alloc.allocated = False
LOG.debug("Releasing vlan %(vlan_id)s on physical "
"network %(physical_network)s to pool",
{'vlan_id': vlan_id,
'physical_network': physical_network})
count = True
LOG.debug("Releasing vlan %(vlan_id)s on physical "
"network %(physical_network)s outside pool",
{'vlan_id': vlan_id,
'physical_network': physical_network})
if not count:
LOG.warning("No vlan_id %(vlan_id)s found on physical "
"network %(physical_network)s",
{'vlan_id': vlan_id,
'physical_network': physical_network})
def get_mtu(self, physical_network):
seg_mtu = super(VlanTypeDriver, self).get_mtu()
mtu = []
if seg_mtu > 0:
if physical_network in self.physnet_mtus:
return min(mtu) if mtu else 0