204 lines
8.0 KiB
Python
204 lines
8.0 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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# @author: Kyle Mestery, Cisco Systems, Inc.
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from oslo.config import cfg
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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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VXLAN_UDP_PORT = 4789
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MAX_VXLAN_VNI = 16777215
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vxlan_opts = [
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cfg.ListOpt('vni_ranges',
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default=[],
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help=_("Comma-separated list of <vni_min>:<vni_max> tuples "
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"enumerating ranges of VXLAN VNI IDs that are "
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"available for tenant network allocation")),
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cfg.StrOpt('vxlan_group', default=None,
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help=_("Multicast group for VXLAN. If unset, disables VXLAN "
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"multicast mode.")),
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]
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cfg.CONF.register_opts(vxlan_opts, "ml2_type_vxlan")
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class VxlanAllocation(model_base.BASEV2):
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__tablename__ = 'ml2_vxlan_allocations'
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vxlan_vni = 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 VxlanEndpoints(model_base.BASEV2):
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"""Represents tunnel endpoint in RPC mode."""
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__tablename__ = 'ml2_vxlan_endpoints'
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ip_address = sa.Column(sa.String(64), primary_key=True)
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udp_port = sa.Column(sa.Integer, primary_key=True, nullable=False,
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autoincrement=False)
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def __repr__(self):
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return "<VxlanTunnelEndpoint(%s)>" % self.ip_address
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class VxlanTypeDriver(type_tunnel.TunnelTypeDriver):
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def get_type(self):
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return p_const.TYPE_VXLAN
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def initialize(self):
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self.vxlan_vni_ranges = []
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self._parse_tunnel_ranges(
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cfg.CONF.ml2_type_vxlan.vni_ranges,
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self.vxlan_vni_ranges,
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p_const.TYPE_VXLAN
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)
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self._sync_vxlan_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(VxlanAllocation).
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filter_by(vxlan_vni=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 vxlan 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 vxlan tunnel %s outside pool"),
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segmentation_id)
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alloc = VxlanAllocation(vxlan_vni=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(VxlanAllocation).
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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 vxlan tunnel vni %(vxlan_vni)s"),
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{'vxlan_vni': alloc.vxlan_vni})
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alloc.allocated = True
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return {api.NETWORK_TYPE: p_const.TYPE_VXLAN,
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api.PHYSICAL_NETWORK: None,
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api.SEGMENTATION_ID: alloc.vxlan_vni}
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def release_segment(self, session, segment):
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vxlan_vni = 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(VxlanAllocation).
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filter_by(vxlan_vni=vxlan_vni).
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with_lockmode('update').
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one())
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alloc.allocated = False
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for low, high in self.vxlan_vni_ranges:
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if low <= vxlan_vni <= high:
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LOG.debug(_("Releasing vxlan tunnel %s to pool"),
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vxlan_vni)
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break
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else:
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session.delete(alloc)
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LOG.debug(_("Releasing vxlan tunnel %s outside pool"),
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vxlan_vni)
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except sa_exc.NoResultFound:
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LOG.warning(_("vxlan_vni %s not found"), vxlan_vni)
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def _sync_vxlan_allocations(self):
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"""
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Synchronize vxlan_allocations table with configured tunnel ranges.
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"""
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# determine current configured allocatable vnis
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vxlan_vnis = set()
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for tun_min, tun_max in self.vxlan_vni_ranges:
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if tun_max + 1 - tun_min > MAX_VXLAN_VNI:
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LOG.error(_("Skipping unreasonable VXLAN VNI 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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vxlan_vnis |= 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(VxlanAllocation).with_lockmode("update")
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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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vxlan_vnis.remove(alloc.vxlan_vni)
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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.vxlan_vni)
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session.delete(alloc)
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# add missing allocatable tunnels to table
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for vxlan_vni in sorted(vxlan_vnis):
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alloc = VxlanAllocation(vxlan_vni=vxlan_vni)
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session.add(alloc)
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def get_vxlan_allocation(self, session, vxlan_vni):
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with session.begin(subtransactions=True):
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return session.query(VxlanAllocation).filter_by(
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vxlan_vni=vxlan_vni).first()
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def get_endpoints(self):
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"""Get every vxlan endpoints from database."""
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LOG.debug(_("get_vxlan_endpoints() called"))
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session = db_api.get_session()
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with session.begin(subtransactions=True):
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vxlan_endpoints = session.query(VxlanEndpoints)
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return [{'ip_address': vxlan_endpoint.ip_address,
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'udp_port': vxlan_endpoint.udp_port}
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for vxlan_endpoint in vxlan_endpoints]
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def add_endpoint(self, ip, udp_port=VXLAN_UDP_PORT):
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LOG.debug(_("add_vxlan_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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vxlan_endpoint = (session.query(VxlanEndpoints).
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filter_by(ip_address=ip).
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with_lockmode('update').one())
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except sa_exc.NoResultFound:
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vxlan_endpoint = VxlanEndpoints(ip_address=ip,
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udp_port=udp_port)
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session.add(vxlan_endpoint)
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return vxlan_endpoint
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