146 lines
5.5 KiB
Python
146 lines
5.5 KiB
Python
# Copyright (c) 2013 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_config import cfg
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from oslo_db import exception as db_exc
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from oslo_log import log
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import six
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import sqlalchemy as sa
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from neutron.common import exceptions as exc
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from neutron.db import model_base
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from neutron.i18n import _LI, _LW
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from neutron.plugins.common import constants as p_const
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from neutron.plugins.ml2 import driver_api as api
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from neutron.plugins.ml2.drivers import helpers
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LOG = log.getLogger(__name__)
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flat_opts = [
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cfg.ListOpt('flat_networks',
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default=[],
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help=_("List of physical_network names with which flat "
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"networks can be created. Use * to allow flat "
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"networks with arbitrary physical_network names."))
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]
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cfg.CONF.register_opts(flat_opts, "ml2_type_flat")
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class FlatAllocation(model_base.BASEV2):
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"""Represent persistent allocation state of a physical network.
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If a record exists for a physical network, then that physical
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network has been allocated as a flat network.
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"""
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__tablename__ = 'ml2_flat_allocations'
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physical_network = sa.Column(sa.String(64), nullable=False,
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primary_key=True)
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class FlatTypeDriver(helpers.BaseTypeDriver):
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"""Manage state for flat networks with ML2.
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The FlatTypeDriver implements the 'flat' network_type. Flat
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network segments provide connectivity between VMs and other
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devices using any connected IEEE 802.1D conformant
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physical_network, without the use of VLAN tags, tunneling, or
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other segmentation mechanisms. Therefore at most one flat network
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segment can exist on each available physical_network.
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"""
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def __init__(self):
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super(FlatTypeDriver, self).__init__()
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self._parse_networks(cfg.CONF.ml2_type_flat.flat_networks)
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def _parse_networks(self, entries):
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self.flat_networks = entries
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if '*' in self.flat_networks:
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LOG.info(_LI("Arbitrary flat physical_network names allowed"))
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self.flat_networks = None
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elif not all(self.flat_networks):
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msg = _("physical network name is empty")
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raise exc.InvalidInput(error_message=msg)
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else:
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LOG.info(_LI("Allowable flat physical_network names: %s"),
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self.flat_networks)
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def get_type(self):
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return p_const.TYPE_FLAT
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def initialize(self):
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LOG.info(_LI("ML2 FlatTypeDriver initialization complete"))
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def is_partial_segment(self, segment):
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return False
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def validate_provider_segment(self, segment):
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physical_network = segment.get(api.PHYSICAL_NETWORK)
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if not physical_network:
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msg = _("physical_network required for flat provider network")
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raise exc.InvalidInput(error_message=msg)
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if self.flat_networks and physical_network not in self.flat_networks:
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msg = (_("physical_network '%s' unknown for flat provider network")
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% physical_network)
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raise exc.InvalidInput(error_message=msg)
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for key, value in six.iteritems(segment):
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if value and key not in [api.NETWORK_TYPE,
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api.PHYSICAL_NETWORK]:
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msg = _("%s prohibited for flat provider network") % key
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raise exc.InvalidInput(error_message=msg)
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def reserve_provider_segment(self, session, segment):
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physical_network = segment[api.PHYSICAL_NETWORK]
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with session.begin(subtransactions=True):
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try:
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LOG.debug("Reserving flat network on physical "
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"network %s", physical_network)
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alloc = FlatAllocation(physical_network=physical_network)
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alloc.save(session)
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except db_exc.DBDuplicateEntry:
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raise exc.FlatNetworkInUse(
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physical_network=physical_network)
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segment[api.MTU] = self.get_mtu(alloc.physical_network)
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return segment
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def allocate_tenant_segment(self, session):
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# Tenant flat networks are not supported.
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return
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def release_segment(self, session, segment):
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physical_network = segment[api.PHYSICAL_NETWORK]
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with session.begin(subtransactions=True):
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count = (session.query(FlatAllocation).
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filter_by(physical_network=physical_network).
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delete())
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if count:
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LOG.debug("Releasing flat network on physical network %s",
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physical_network)
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else:
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LOG.warning(_LW("No flat network found on physical network %s"),
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physical_network)
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def get_mtu(self, physical_network):
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seg_mtu = super(FlatTypeDriver, self).get_mtu()
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mtu = []
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if seg_mtu > 0:
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mtu.append(seg_mtu)
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if physical_network in self.physnet_mtus:
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mtu.append(int(self.physnet_mtus[physical_network]))
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return min(mtu) if mtu else 0
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