231 lines
9.6 KiB
Python
231 lines
9.6 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2013 VMware, Inc.
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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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#
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from eventlet import greenthread
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import netaddr
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from oslo.config import cfg
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from neutron.api.rpc.agentnotifiers import dhcp_rpc_agent_api
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from neutron.api.v2 import attributes
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from neutron.common import constants as const
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from neutron.common import exceptions as ntn_exc
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from neutron.common import rpc as n_rpc
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from neutron.db import agents_db
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from neutron.db import db_base_plugin_v2
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from neutron.db import dhcp_rpc_base
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from neutron.db import l3_db
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from neutron.db import models_v2
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from neutron.openstack.common import log as logging
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from neutron.plugins.vmware.api_client import exception as api_exc
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from neutron.plugins.vmware.common import config
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from neutron.plugins.vmware.common import exceptions as nsx_exc
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LOG = logging.getLogger(__name__)
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METADATA_DEFAULT_PREFIX = 30
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METADATA_SUBNET_CIDR = '169.254.169.252/%d' % METADATA_DEFAULT_PREFIX
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METADATA_GATEWAY_IP = '169.254.169.253'
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METADATA_DHCP_ROUTE = '169.254.169.254/32'
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class NSXRpcCallbacks(dhcp_rpc_base.DhcpRpcCallbackMixin):
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RPC_API_VERSION = '1.1'
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def create_rpc_dispatcher(self):
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'''Get the rpc dispatcher for this manager.
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If a manager would like to set an rpc API version, or support more than
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one class as the target of rpc messages, override this method.
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'''
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return n_rpc.PluginRpcDispatcher([self,
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agents_db.AgentExtRpcCallback()])
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def handle_network_dhcp_access(plugin, context, network, action):
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pass
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def handle_port_dhcp_access(plugin, context, port_data, action):
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active_port = (cfg.CONF.NSX.metadata_mode == config.MetadataModes.INDIRECT
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and port_data.get('device_owner') == const.DEVICE_OWNER_DHCP
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and port_data.get('fixed_ips', []))
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if active_port:
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subnet_id = port_data['fixed_ips'][0]['subnet_id']
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subnet = plugin.get_subnet(context, subnet_id)
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_notify_rpc_agent(context, {'subnet': subnet}, 'subnet.update.end')
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def handle_port_metadata_access(plugin, context, port, is_delete=False):
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if (cfg.CONF.NSX.metadata_mode == config.MetadataModes.INDIRECT and
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port.get('device_owner') == const.DEVICE_OWNER_DHCP):
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if port.get('fixed_ips', []) or is_delete:
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fixed_ip = port['fixed_ips'][0]
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query = context.session.query(models_v2.Subnet)
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subnet = query.filter(
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models_v2.Subnet.id == fixed_ip['subnet_id']).one()
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# If subnet does not have a gateway do not create metadata
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# route. This is done via the enable_isolated_metadata
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# option if desired.
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if not subnet.get('gateway_ip'):
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LOG.info(_('Subnet %s does not have a gateway, the metadata '
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'route will not be created'), subnet['id'])
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return
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metadata_routes = [r for r in subnet.routes
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if r['destination'] == METADATA_DHCP_ROUTE]
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if metadata_routes:
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# We should have only a single metadata route at any time
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# because the route logic forbids two routes with the same
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# destination. Update next hop with the provided IP address
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if not is_delete:
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metadata_routes[0].nexthop = fixed_ip['ip_address']
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else:
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context.session.delete(metadata_routes[0])
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else:
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# add the metadata route
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route = models_v2.SubnetRoute(
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subnet_id=subnet.id,
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destination=METADATA_DHCP_ROUTE,
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nexthop=fixed_ip['ip_address'])
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context.session.add(route)
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def handle_router_metadata_access(plugin, context, router_id, interface=None):
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if cfg.CONF.NSX.metadata_mode != config.MetadataModes.DIRECT:
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LOG.debug(_("Metadata access network is disabled"))
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return
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if not cfg.CONF.allow_overlapping_ips:
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LOG.warn(_("Overlapping IPs must be enabled in order to setup "
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"the metadata access network"))
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return
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ctx_elevated = context.elevated()
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device_filter = {'device_id': [router_id],
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'device_owner': [l3_db.DEVICE_OWNER_ROUTER_INTF]}
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# Retrieve ports calling database plugin
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ports = db_base_plugin_v2.NeutronDbPluginV2.get_ports(
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plugin, ctx_elevated, filters=device_filter)
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try:
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if ports:
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if (interface and
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not _find_metadata_port(plugin, ctx_elevated, ports)):
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_create_metadata_access_network(
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plugin, ctx_elevated, router_id)
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elif len(ports) == 1:
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# The only port left might be the metadata port
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_destroy_metadata_access_network(
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plugin, ctx_elevated, router_id, ports)
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else:
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LOG.debug(_("No router interface found for router '%s'. "
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"No metadata access network should be "
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"created or destroyed"), router_id)
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# TODO(salvatore-orlando): A better exception handling in the
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# NSX plugin would allow us to improve error handling here
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except (ntn_exc.NeutronException, nsx_exc.NsxPluginException,
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api_exc.NsxApiException):
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# Any exception here should be regarded as non-fatal
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LOG.exception(_("An error occurred while operating on the "
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"metadata access network for router:'%s'"),
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router_id)
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def _find_metadata_port(plugin, context, ports):
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for port in ports:
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for fixed_ip in port['fixed_ips']:
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cidr = netaddr.IPNetwork(
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plugin.get_subnet(context, fixed_ip['subnet_id'])['cidr'])
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if cidr in netaddr.IPNetwork(METADATA_SUBNET_CIDR):
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return port
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def _create_metadata_access_network(plugin, context, router_id):
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# Add network
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# Network name is likely to be truncated on NSX
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net_data = {'name': 'meta-%s' % router_id,
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'tenant_id': '', # intentionally not set
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'admin_state_up': True,
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'port_security_enabled': False,
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'shared': False,
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'status': const.NET_STATUS_ACTIVE}
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meta_net = plugin.create_network(context,
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{'network': net_data})
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greenthread.sleep(0) # yield
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# From this point on there will be resources to garbage-collect
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# in case of failures
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meta_sub = None
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try:
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# Add subnet
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subnet_data = {'network_id': meta_net['id'],
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'tenant_id': '', # intentionally not set
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'name': 'meta-%s' % router_id,
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'ip_version': 4,
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'shared': False,
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'cidr': METADATA_SUBNET_CIDR,
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'enable_dhcp': True,
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# Ensure default allocation pool is generated
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'allocation_pools': attributes.ATTR_NOT_SPECIFIED,
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'gateway_ip': METADATA_GATEWAY_IP,
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'dns_nameservers': [],
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'host_routes': []}
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meta_sub = plugin.create_subnet(context,
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{'subnet': subnet_data})
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greenthread.sleep(0) # yield
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plugin.add_router_interface(context, router_id,
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{'subnet_id': meta_sub['id']})
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greenthread.sleep(0) # yield
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except (ntn_exc.NeutronException,
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nsx_exc.NsxPluginException,
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api_exc.NsxApiException):
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# It is not necessary to explicitly delete the subnet
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# as it will be removed with the network
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plugin.delete_network(context, meta_net['id'])
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# Tell to start the metadata agent proxy
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_notify_rpc_agent(context, {'network': meta_net}, 'network.create.end')
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def _destroy_metadata_access_network(plugin, context, router_id, ports):
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if not ports:
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return
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meta_port = _find_metadata_port(plugin, context, ports)
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if not meta_port:
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return
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meta_net_id = meta_port['network_id']
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meta_sub_id = meta_port['fixed_ips'][0]['subnet_id']
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plugin.remove_router_interface(
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context, router_id, {'port_id': meta_port['id']})
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greenthread.sleep(0) # yield
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context.session.expunge_all()
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try:
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# Remove network (this will remove the subnet too)
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plugin.delete_network(context, meta_net_id)
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greenthread.sleep(0) # yield
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except (ntn_exc.NeutronException, nsx_exc.NsxPluginException,
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api_exc.NsxApiException):
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# must re-add the router interface
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plugin.add_router_interface(context, router_id,
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{'subnet_id': meta_sub_id})
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# Tell to stop the metadata agent proxy
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_notify_rpc_agent(
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context, {'network': {'id': meta_net_id}}, 'network.delete.end')
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def _notify_rpc_agent(context, payload, event):
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if cfg.CONF.dhcp_agent_notification:
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dhcp_notifier = dhcp_rpc_agent_api.DhcpAgentNotifyAPI()
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dhcp_notifier.notify(context, payload, event)
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