176 lines
7.3 KiB
Python
176 lines
7.3 KiB
Python
# Copyright 2014 Hewlett-Packard Development Company, L.P.
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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 helpers as log_helpers
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from oslo_log import log as logging
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import sqlalchemy as sa
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from sqlalchemy.orm import exc
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from neutron.common import exceptions as n_exc
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from neutron.common import utils
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from neutron.db import model_base
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from neutron.extensions import dvr as ext_dvr
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from neutron.extensions import portbindings
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from neutron.i18n import _LE
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from neutron import manager
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LOG = logging.getLogger(__name__)
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dvr_mac_address_opts = [
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cfg.StrOpt('dvr_base_mac',
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default="fa:16:3f:00:00:00",
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help=_('The base mac address used for unique '
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'DVR instances by Neutron')),
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]
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cfg.CONF.register_opts(dvr_mac_address_opts)
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class DistributedVirtualRouterMacAddress(model_base.BASEV2):
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"""Represents a v2 neutron distributed virtual router mac address."""
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__tablename__ = 'dvr_host_macs'
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host = sa.Column(sa.String(255), primary_key=True, nullable=False)
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mac_address = sa.Column(sa.String(32), nullable=False, unique=True)
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class DVRDbMixin(ext_dvr.DVRMacAddressPluginBase):
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"""Mixin class to add dvr mac address to db_plugin_base_v2."""
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@property
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def plugin(self):
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try:
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if self._plugin is not None:
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return self._plugin
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except AttributeError:
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pass
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self._plugin = manager.NeutronManager.get_plugin()
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return self._plugin
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def _get_dvr_mac_address_by_host(self, context, host):
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try:
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query = context.session.query(DistributedVirtualRouterMacAddress)
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dvrma = query.filter(
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DistributedVirtualRouterMacAddress.host == host).one()
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except exc.NoResultFound:
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raise ext_dvr.DVRMacAddressNotFound(host=host)
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return dvrma
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def _create_dvr_mac_address(self, context, host):
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"""Create DVR mac address for a given host."""
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base_mac = cfg.CONF.dvr_base_mac.split(':')
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max_retries = cfg.CONF.mac_generation_retries
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for attempt in reversed(range(max_retries)):
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try:
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with context.session.begin(subtransactions=True):
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mac_address = utils.get_random_mac(base_mac)
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dvr_mac_binding = DistributedVirtualRouterMacAddress(
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host=host, mac_address=mac_address)
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context.session.add(dvr_mac_binding)
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LOG.debug("Generated DVR mac for host %(host)s "
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"is %(mac_address)s",
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{'host': host, 'mac_address': mac_address})
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dvr_macs = self.get_dvr_mac_address_list(context)
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# TODO(vivek): improve scalability of this fanout by
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# sending a single mac address rather than the entire set
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self.notifier.dvr_mac_address_update(context, dvr_macs)
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return self._make_dvr_mac_address_dict(dvr_mac_binding)
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except db_exc.DBDuplicateEntry:
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LOG.debug("Generated DVR mac %(mac)s exists."
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" Remaining attempts %(attempts_left)s.",
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{'mac': mac_address, 'attempts_left': attempt})
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LOG.error(_LE("MAC generation error after %s attempts"), max_retries)
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raise ext_dvr.MacAddressGenerationFailure(host=host)
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def delete_dvr_mac_address(self, context, host):
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query = context.session.query(DistributedVirtualRouterMacAddress)
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(query.
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filter(DistributedVirtualRouterMacAddress.host == host).
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delete(synchronize_session=False))
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def get_dvr_mac_address_list(self, context):
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with context.session.begin(subtransactions=True):
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return (context.session.
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query(DistributedVirtualRouterMacAddress).all())
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def get_dvr_mac_address_by_host(self, context, host):
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"""Determine the MAC for the DVR port associated to host."""
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if not host:
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return
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try:
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return self._get_dvr_mac_address_by_host(context, host)
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except ext_dvr.DVRMacAddressNotFound:
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return self._create_dvr_mac_address(context, host)
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def _make_dvr_mac_address_dict(self, dvr_mac_entry, fields=None):
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return {'host': dvr_mac_entry['host'],
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'mac_address': dvr_mac_entry['mac_address']}
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@log_helpers.log_method_call
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def get_ports_on_host_by_subnet(self, context, host, subnet):
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"""Returns ports of interest, on a given subnet in the input host
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This method returns ports that need to be serviced by DVR.
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:param context: rpc request context
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:param host: host id to match and extract ports of interest
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:param subnet: subnet id to match and extract ports of interest
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:returns list -- Ports on the given subnet in the input host
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"""
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# FIXME(vivek, salv-orlando): improve this query by adding the
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# capability of filtering by binding:host_id
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ports_by_host = []
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filter = {'fixed_ips': {'subnet_id': [subnet]}}
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ports = self.plugin.get_ports(context, filters=filter)
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LOG.debug("List of Ports on subnet %(subnet)s at host %(host)s "
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"received as %(ports)s",
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{'subnet': subnet, 'host': host, 'ports': ports})
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for port in ports:
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device_owner = port['device_owner']
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if (utils.is_dvr_serviced(device_owner)):
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if port[portbindings.HOST_ID] == host:
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port_dict = self.plugin._make_port_dict(port,
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process_extensions=False)
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ports_by_host.append(port_dict)
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LOG.debug("Returning list of dvr serviced ports on host %(host)s"
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" for subnet %(subnet)s ports %(ports)s",
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{'host': host, 'subnet': subnet,
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'ports': ports_by_host})
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return ports_by_host
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@log_helpers.log_method_call
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def get_subnet_for_dvr(self, context, subnet):
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try:
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subnet_info = self.plugin.get_subnet(context, subnet)
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except n_exc.SubnetNotFound:
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return {}
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else:
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# retrieve the gateway port on this subnet
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filter = {'fixed_ips': {'subnet_id': [subnet],
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'ip_address': [subnet_info['gateway_ip']]}}
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internal_gateway_ports = self.plugin.get_ports(
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context, filters=filter)
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if not internal_gateway_ports:
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LOG.error(_LE("Could not retrieve gateway port "
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"for subnet %s"), subnet_info)
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return {}
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internal_port = internal_gateway_ports[0]
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subnet_info['gateway_mac'] = internal_port['mac_address']
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return subnet_info
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