220 lines
9.0 KiB
Python
220 lines
9.0 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 neutron_lib import constants
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from neutron_lib.db import model_base
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from neutron_lib import exceptions as n_exc
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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 import or_
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from sqlalchemy.orm import exc
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from neutron._i18n import _, _LE
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from neutron.callbacks import events
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from neutron.callbacks import registry
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from neutron.callbacks import resources
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from neutron.common import utils
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from neutron.db import api as db_api
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from neutron.db import models_v2
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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 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. The first 3 octets will "
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"remain unchanged. If the 4th octet is not 00, it will "
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"also be used. The others will be randomly generated. "
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"The 'dvr_base_mac' *must* be different from "
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"'base_mac' to avoid mixing them up with MAC's "
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"allocated for tenant ports. A 4 octet example would be "
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"dvr_base_mac = fa:16:3f:4f:00:00. The default is 3 "
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"octet")),
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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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def _delete_mac_associated_with_agent(resource, event, trigger, context, agent,
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**kwargs):
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host = agent['host']
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plugin = manager.NeutronManager.get_plugin()
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if [a for a in plugin.get_agents(context, filters={'host': [host]})
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if a['id'] != agent['id']]:
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# there are still agents on this host, don't mess with the mac entry
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# until they are all deleted.
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return
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try:
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with context.session.begin(subtransactions=True):
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entry = (context.session.query(DistributedVirtualRouterMacAddress).
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filter(DistributedVirtualRouterMacAddress.host == host).
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one())
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context.session.delete(entry)
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except exc.NoResultFound:
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return
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# notify remaining agents so they cleanup flows
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dvr_macs = plugin.get_dvr_mac_address_list(context)
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plugin.notifier.dvr_mac_address_update(context, dvr_macs)
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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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def __new__(cls, *args, **kwargs):
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registry.subscribe(_delete_mac_associated_with_agent,
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resources.AGENT, events.BEFORE_DELETE)
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return super(DVRDbMixin, cls).__new__(cls)
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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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for attempt in reversed(range(db_api.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"),
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db_api.MAX_RETRIES)
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raise ext_dvr.MacAddressGenerationFailure(host=host)
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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 DVR serviced ports 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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filters = {'fixed_ips': {'subnet_id': [subnet]},
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portbindings.HOST_ID: [host]}
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ports_query = self.plugin._get_ports_query(context, filters=filters)
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owner_filter = or_(
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models_v2.Port.device_owner.startswith(
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constants.DEVICE_OWNER_COMPUTE_PREFIX),
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models_v2.Port.device_owner.in_(
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utils.get_other_dvr_serviced_device_owners()))
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ports_query = ports_query.filter(owner_filter)
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ports = [
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self.plugin._make_port_dict(port, process_extensions=False)
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for port in ports_query.all()
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]
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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})
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return ports
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@log_helpers.log_method_call
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def get_subnet_for_dvr(self, context, subnet, fixed_ips=None):
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if fixed_ips:
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subnet_data = fixed_ips[0]['subnet_id']
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else:
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subnet_data = subnet
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try:
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subnet_info = self.plugin.get_subnet(
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context, subnet_data)
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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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if fixed_ips:
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ip_address = fixed_ips[0]['ip_address']
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else:
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ip_address = subnet_info['gateway_ip']
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filter = {'fixed_ips': {'subnet_id': [subnet],
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'ip_address': [ip_address]}}
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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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