# Copyright 2014 Arista Networks, Inc. All rights reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. import copy import threading from oslo.config import cfg from neutron.api.rpc.agentnotifiers import l3_rpc_agent_api from neutron.api.rpc.handlers import l3_rpc from neutron.common import constants as q_const from neutron.common import log from neutron.common import rpc as q_rpc from neutron.common import topics from neutron import context as nctx from neutron.db import db_base_plugin_v2 from neutron.db import extraroute_db from neutron.db import l3_agentschedulers_db from neutron.db import l3_gwmode_db from neutron.openstack.common import excutils from neutron.openstack.common import log as logging from neutron.plugins.common import constants from neutron.plugins.ml2.driver_context import NetworkContext # noqa from neutron.plugins.ml2.drivers.arista import arista_l3_driver LOG = logging.getLogger(__name__) class AristaL3ServicePlugin(db_base_plugin_v2.NeutronDbPluginV2, extraroute_db.ExtraRoute_db_mixin, l3_gwmode_db.L3_NAT_db_mixin, l3_agentschedulers_db.L3AgentSchedulerDbMixin): """Implements L3 Router service plugin for Arista hardware. Creates routers in Arista hardware, manages them, adds/deletes interfaces to the routes. """ supported_extension_aliases = ["router", "ext-gw-mode", "extraroute"] def __init__(self, driver=None): self.driver = driver or arista_l3_driver.AristaL3Driver() self.ndb = arista_l3_driver.NeutronNets() self.setup_rpc() self.sync_timeout = cfg.CONF.l3_arista.l3_sync_interval self.sync_lock = threading.Lock() self._synchronization_thread() def setup_rpc(self): # RPC support self.topic = topics.L3PLUGIN self.conn = q_rpc.create_connection(new=True) self.agent_notifiers.update( {q_const.AGENT_TYPE_L3: l3_rpc_agent_api.L3AgentNotifyAPI()}) self.endpoints = [l3_rpc.L3RpcCallback()] self.conn.create_consumer(self.topic, self.endpoints, fanout=False) self.conn.consume_in_threads() def get_plugin_type(self): return constants.L3_ROUTER_NAT def get_plugin_description(self): """Returns string description of the plugin.""" return ("Arista L3 Router Service Plugin for Arista Hardware " "based routing") def _synchronization_thread(self): with self.sync_lock: self.synchronize() self.timer = threading.Timer(self.sync_timeout, self._synchronization_thread) self.timer.start() def stop_synchronization_thread(self): if self.timer: self.timer.cancel() self.timer = None @log.log def create_router(self, context, router): """Create a new router entry in DB, and create it Arista HW.""" tenant_id = self._get_tenant_id_for_create(context, router['router']) # Add router to the DB with context.session.begin(subtransactions=True): new_router = super(AristaL3ServicePlugin, self).create_router( context, router) # create router on the Arista Hw try: self.driver.create_router(context, tenant_id, new_router) return new_router except Exception: with excutils.save_and_reraise_exception(): LOG.error(_("Error creating router on Arista HW " "router=%s ") % new_router) super(AristaL3ServicePlugin, self).delete_router(context, new_router['id']) @log.log def update_router(self, context, router_id, router): """Update an existing router in DB, and update it in Arista HW.""" with context.session.begin(subtransactions=True): # Read existing router record from DB original_router = super(AristaL3ServicePlugin, self).get_router( context, router_id) # Update router DB new_router = super(AristaL3ServicePlugin, self).update_router( context, router_id, router) # Modify router on the Arista Hw try: self.driver.update_router(context, router_id, original_router, new_router) return new_router except Exception: LOG.error(_("Error updating router on Arista HW " "router=%s ") % new_router) @log.log def delete_router(self, context, router_id): """Delete an existing router from Arista HW as well as from the DB.""" router = super(AristaL3ServicePlugin, self).get_router(context, router_id) tenant_id = router['tenant_id'] # Delete router on the Arista Hw try: self.driver.delete_router(context, tenant_id, router_id, router) except Exception as e: LOG.error(_("Error deleting router on Arista HW " "router %(r)s exception=%(e)s") % {'r': router, 'e': e}) with context.session.begin(subtransactions=True): super(AristaL3ServicePlugin, self).delete_router(context, router_id) @log.log def add_router_interface(self, context, router_id, interface_info): """Add a subnet of a network to an existing router.""" new_router = super(AristaL3ServicePlugin, self).add_router_interface( context, router_id, interface_info) # Get network info for the subnet that is being added to the router. # Check if the interface information is by port-id or subnet-id add_by_port, add_by_sub = self._validate_interface_info(interface_info) if add_by_sub: subnet = self.get_subnet(context, interface_info['subnet_id']) elif add_by_port: port = self.get_port(context, interface_info['port_id']) subnet_id = port['fixed_ips'][0]['subnet_id'] subnet = self.get_subnet(context, subnet_id) network_id = subnet['network_id'] # To create SVI's in Arista HW, the segmentation Id is required # for this network. ml2_db = NetworkContext(self, context, {'id': network_id}) seg_id = ml2_db.network_segments[0]['segmentation_id'] # Package all the info needed for Hw programming router = super(AristaL3ServicePlugin, self).get_router(context, router_id) router_info = copy.deepcopy(new_router) router_info['seg_id'] = seg_id router_info['name'] = router['name'] router_info['cidr'] = subnet['cidr'] router_info['gip'] = subnet['gateway_ip'] router_info['ip_version'] = subnet['ip_version'] try: self.driver.add_router_interface(context, router_info) return new_router except Exception: with excutils.save_and_reraise_exception(): LOG.error(_("Error Adding subnet %(subnet)s to " "router %(router_id)s on Arista HW") % {'subnet': subnet, 'router_id': router_id}) super(AristaL3ServicePlugin, self).remove_router_interface( context, router_id, interface_info) @log.log def remove_router_interface(self, context, router_id, interface_info): """Remove a subnet of a network from an existing router.""" new_router = ( super(AristaL3ServicePlugin, self).remove_router_interface( context, router_id, interface_info)) # Get network information of the subnet that is being removed subnet = self.get_subnet(context, new_router['subnet_id']) network_id = subnet['network_id'] # For SVI removal from Arista HW, segmentation ID is needed ml2_db = NetworkContext(self, context, {'id': network_id}) seg_id = ml2_db.network_segments[0]['segmentation_id'] router = super(AristaL3ServicePlugin, self).get_router(context, router_id) router_info = copy.deepcopy(new_router) router_info['seg_id'] = seg_id router_info['name'] = router['name'] try: self.driver.remove_router_interface(context, router_info) return new_router except Exception as exc: LOG.error(_("Error removing interface %(interface)s from " "router %(router_id)s on Arista HW" "Exception =(exc)s") % {'interface': interface_info, 'router_id': router_id, 'exc': exc}) def synchronize(self): """Synchronizes Router DB from Neturon DB with EOS. Walks through the Neturon Db and ensures that all the routers created in Netuton DB match with EOS. After creating appropriate routers, it ensures to add interfaces as well. Uses idempotent properties of EOS configuration, which means same commands can be repeated. """ LOG.info(_('Syncing Neutron Router DB <-> EOS')) ctx = nctx.get_admin_context() routers = super(AristaL3ServicePlugin, self).get_routers(ctx) for r in routers: tenant_id = r['tenant_id'] ports = self.ndb.get_all_ports_for_tenant(tenant_id) try: self.driver.create_router(self, tenant_id, r) except Exception: continue # Figure out which interfaces are added to this router for p in ports: if p['device_id'] == r['id']: net_id = p['network_id'] subnet_id = p['fixed_ips'][0]['subnet_id'] subnet = self.ndb.get_subnet_info(subnet_id) ml2_db = NetworkContext(self, ctx, {'id': net_id}) seg_id = ml2_db.network_segments[0]['segmentation_id'] r['seg_id'] = seg_id r['cidr'] = subnet['cidr'] r['gip'] = subnet['gateway_ip'] r['ip_version'] = subnet['ip_version'] try: self.driver.add_router_interface(self, r) except Exception: LOG.error(_("Error Adding interface %(subnet_id)s to " "router %(router_id)s on Arista HW") % {'subnet_id': subnet_id, 'router_id': r}) def _validate_interface_info(self, interface_info): port_id_specified = interface_info and 'port_id' in interface_info subnet_id_specified = interface_info and 'subnet_id' in interface_info return port_id_specified, subnet_id_specified