191 lines
7.3 KiB
Python
191 lines
7.3 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 six.moves import xrange
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import sqlalchemy as sa
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from sqlalchemy.orm import exc as sa_exc
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from neutron.common import exceptions as exc
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from neutron.db import api as db_api
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from neutron.db import model_base
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from neutron.openstack.common import log
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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 type_tunnel
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LOG = log.getLogger(__name__)
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gre_opts = [
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cfg.ListOpt('tunnel_id_ranges',
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default=[],
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help=_("Comma-separated list of <tun_min>:<tun_max> tuples "
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"enumerating ranges of GRE tunnel IDs that are "
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"available for tenant network allocation"))
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]
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cfg.CONF.register_opts(gre_opts, "ml2_type_gre")
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class GreAllocation(model_base.BASEV2):
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__tablename__ = 'ml2_gre_allocations'
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gre_id = sa.Column(sa.Integer, nullable=False, primary_key=True,
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autoincrement=False)
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allocated = sa.Column(sa.Boolean, nullable=False, default=False)
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class GreEndpoints(model_base.BASEV2):
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"""Represents tunnel endpoint in RPC mode."""
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__tablename__ = 'ml2_gre_endpoints'
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ip_address = sa.Column(sa.String(64), primary_key=True)
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def __repr__(self):
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return "<GreTunnelEndpoint(%s)>" % self.ip_address
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class GreTypeDriver(type_tunnel.TunnelTypeDriver):
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def get_type(self):
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return p_const.TYPE_GRE
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def initialize(self):
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self.gre_id_ranges = []
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self._parse_tunnel_ranges(
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cfg.CONF.ml2_type_gre.tunnel_id_ranges,
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self.gre_id_ranges,
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p_const.TYPE_GRE
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)
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self._sync_gre_allocations()
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def reserve_provider_segment(self, session, segment):
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segmentation_id = segment.get(api.SEGMENTATION_ID)
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with session.begin(subtransactions=True):
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try:
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alloc = (session.query(GreAllocation).
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filter_by(gre_id=segmentation_id).
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with_lockmode('update').
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one())
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if alloc.allocated:
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raise exc.TunnelIdInUse(tunnel_id=segmentation_id)
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LOG.debug(_("Reserving specific gre tunnel %s from pool"),
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segmentation_id)
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alloc.allocated = True
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except sa_exc.NoResultFound:
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LOG.debug(_("Reserving specific gre tunnel %s outside pool"),
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segmentation_id)
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alloc = GreAllocation(gre_id=segmentation_id)
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alloc.allocated = True
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session.add(alloc)
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def allocate_tenant_segment(self, session):
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with session.begin(subtransactions=True):
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alloc = (session.query(GreAllocation).
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filter_by(allocated=False).
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with_lockmode('update').
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first())
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if alloc:
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LOG.debug(_("Allocating gre tunnel id %(gre_id)s"),
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{'gre_id': alloc.gre_id})
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alloc.allocated = True
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return {api.NETWORK_TYPE: p_const.TYPE_GRE,
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api.PHYSICAL_NETWORK: None,
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api.SEGMENTATION_ID: alloc.gre_id}
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def release_segment(self, session, segment):
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gre_id = segment[api.SEGMENTATION_ID]
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with session.begin(subtransactions=True):
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try:
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alloc = (session.query(GreAllocation).
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filter_by(gre_id=gre_id).
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with_lockmode('update').
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one())
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alloc.allocated = False
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for lo, hi in self.gre_id_ranges:
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if lo <= gre_id <= hi:
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LOG.debug(_("Releasing gre tunnel %s to pool"),
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gre_id)
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break
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else:
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session.delete(alloc)
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LOG.debug(_("Releasing gre tunnel %s outside pool"),
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gre_id)
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except sa_exc.NoResultFound:
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LOG.warning(_("gre_id %s not found"), gre_id)
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def _sync_gre_allocations(self):
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"""Synchronize gre_allocations table with configured tunnel ranges."""
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# determine current configured allocatable gres
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gre_ids = set()
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for gre_id_range in self.gre_id_ranges:
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tun_min, tun_max = gre_id_range
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if tun_max + 1 - tun_min > 1000000:
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LOG.error(_("Skipping unreasonable gre ID range "
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"%(tun_min)s:%(tun_max)s"),
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{'tun_min': tun_min, 'tun_max': tun_max})
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else:
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gre_ids |= set(xrange(tun_min, tun_max + 1))
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session = db_api.get_session()
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with session.begin(subtransactions=True):
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# remove from table unallocated tunnels not currently allocatable
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allocs = (session.query(GreAllocation).all())
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for alloc in allocs:
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try:
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# see if tunnel is allocatable
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gre_ids.remove(alloc.gre_id)
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except KeyError:
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# it's not allocatable, so check if its allocated
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if not alloc.allocated:
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# it's not, so remove it from table
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LOG.debug(_("Removing tunnel %s from pool"),
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alloc.gre_id)
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session.delete(alloc)
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# add missing allocatable tunnels to table
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for gre_id in sorted(gre_ids):
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alloc = GreAllocation(gre_id=gre_id)
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session.add(alloc)
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def get_gre_allocation(self, session, gre_id):
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return session.query(GreAllocation).filter_by(gre_id=gre_id).first()
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def get_endpoints(self):
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"""Get every gre endpoints from database."""
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LOG.debug(_("get_gre_endpoints() called"))
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session = db_api.get_session()
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with session.begin(subtransactions=True):
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gre_endpoints = session.query(GreEndpoints)
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return [{'ip_address': gre_endpoint.ip_address}
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for gre_endpoint in gre_endpoints]
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def add_endpoint(self, ip):
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LOG.debug(_("add_gre_endpoint() called for ip %s"), ip)
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session = db_api.get_session()
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with session.begin(subtransactions=True):
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try:
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gre_endpoint = (session.query(GreEndpoints).
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filter_by(ip_address=ip).one())
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LOG.warning(_("Gre endpoint with ip %s already exists"), ip)
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except sa_exc.NoResultFound:
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gre_endpoint = GreEndpoints(ip_address=ip)
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session.add(gre_endpoint)
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return gre_endpoint
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