135 lines
5.2 KiB
Python
135 lines
5.2 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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import sqlalchemy as sa
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from quantum.common import exceptions as exc
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from quantum.db import model_base
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from quantum.openstack.common import log
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from quantum.plugins.ml2 import driver_api as api
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LOG = log.getLogger(__name__)
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TYPE_FLAT = 'flat'
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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(api.TypeDriver):
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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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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(_("Arbitrary flat physical_network names allowed"))
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self.flat_networks = None
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else:
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# TODO(rkukura): Validate that each physical_network name
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# is neither empty nor too long.
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LOG.info(_("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 TYPE_FLAT
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def initialize(self):
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LOG.info(_("ML2 FlatTypeDriver initialization complete"))
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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 segment.iteritems():
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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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return segment
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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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alloc = (session.query(FlatAllocation).
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filter_by(physical_network=physical_network).
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with_lockmode('update').
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one())
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raise exc.FlatNetworkInUse(
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physical_network=physical_network)
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except sa.orm.exc.NoResultFound:
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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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session.add(alloc)
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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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try:
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alloc = (session.query(FlatAllocation).
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filter_by(physical_network=physical_network).
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with_lockmode('update').
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one())
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session.delete(alloc)
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LOG.debug(_("Releasing flat network on physical "
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"network %s"), physical_network)
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except sa.orm.exc.NoResultFound:
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LOG.warning(_("No flat network found on physical network %s"),
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physical_network)
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