# Copyright 2014 # The Cloudscaling Group, Inc. # # 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 collections import copy import netaddr from novaclient import exceptions as nova_exception from ec2api.api import clients from ec2api.api import common from ec2api.api import ec2utils from ec2api.db import api as db_api from ec2api import exception from ec2api.i18n import _ Validator = common.Validator def create_route_table(context, vpc_id): vpc = ec2utils.get_db_item(context, vpc_id) route_table = _create_route_table(context, vpc) return {'routeTable': _format_route_table(context, route_table, is_main=False)} def create_route(context, route_table_id, destination_cidr_block, gateway_id=None, instance_id=None, network_interface_id=None, vpc_peering_connection_id=None): return _set_route(context, route_table_id, destination_cidr_block, gateway_id, instance_id, network_interface_id, vpc_peering_connection_id, False) def replace_route(context, route_table_id, destination_cidr_block, gateway_id=None, instance_id=None, network_interface_id=None, vpc_peering_connection_id=None): return _set_route(context, route_table_id, destination_cidr_block, gateway_id, instance_id, network_interface_id, vpc_peering_connection_id, True) def delete_route(context, route_table_id, destination_cidr_block): route_table = ec2utils.get_db_item(context, route_table_id) for route_index, route in enumerate(route_table['routes']): if route['destination_cidr_block'] != destination_cidr_block: continue if route.get('gateway_id', 0) is None: msg = _('cannot remove local route %(destination_cidr_block)s ' 'in route table %(route_table_id)s') msg = msg % {'route_table_id': route_table_id, 'destination_cidr_block': destination_cidr_block} raise exception.InvalidParameterValue(msg) break else: raise exception.InvalidRouteNotFound( route_table_id=route_table_id, destination_cidr_block=destination_cidr_block) rollback_route_table_state = copy.deepcopy(route_table) del route_table['routes'][route_index] with common.OnCrashCleaner() as cleaner: db_api.update_item(context, route_table) cleaner.addCleanup(db_api.update_item, context, rollback_route_table_state) _update_routes_in_associated_subnets(context, route_table, cleaner, rollback_route_table_state) return True def associate_route_table(context, route_table_id, subnet_id): route_table = ec2utils.get_db_item(context, route_table_id) subnet = ec2utils.get_db_item(context, subnet_id) if route_table['vpc_id'] != subnet['vpc_id']: msg = _('Route table %(rtb_id)s and subnet %(subnet_id)s belong to ' 'different networks') msg = msg % {'rtb_id': route_table_id, 'subnet_id': subnet_id} raise exception.InvalidParameterValue(msg) if 'route_table_id' in subnet: msg = _('The specified association for route table %(rtb_id)s ' 'conflicts with an existing association') msg = msg % {'rtb_id': route_table_id} raise exception.ResourceAlreadyAssociated(msg) vpc = db_api.get_item_by_id(context, subnet['vpc_id']) main_route_table = db_api.get_item_by_id(context, vpc['route_table_id']) with common.OnCrashCleaner() as cleaner: _associate_subnet_item(context, subnet, route_table['id']) cleaner.addCleanup(_disassociate_subnet_item, context, subnet) _update_subnet_host_routes( context, subnet, route_table, cleaner=cleaner, rollback_route_table_object=main_route_table) return {'associationId': ec2utils.change_ec2_id_kind(subnet['id'], 'rtbassoc')} def replace_route_table_association(context, association_id, route_table_id): route_table = ec2utils.get_db_item(context, route_table_id) if route_table['vpc_id'] == ec2utils.change_ec2_id_kind(association_id, 'vpc'): vpc = db_api.get_item_by_id( context, ec2utils.change_ec2_id_kind(association_id, 'vpc')) if vpc is None: raise exception.InvalidAssociationIDNotFound( id=association_id) rollabck_route_table_object = db_api.get_item_by_id( context, vpc['route_table_id']) with common.OnCrashCleaner() as cleaner: _associate_vpc_item(context, vpc, route_table['id']) cleaner.addCleanup(_associate_vpc_item, context, vpc, rollabck_route_table_object['id']) # NOTE(ft): this can cause unnecessary update of subnets, which are # associated with the route table _update_routes_in_associated_subnets( context, route_table, cleaner, rollabck_route_table_object, is_main=True) else: subnet = db_api.get_item_by_id( context, ec2utils.change_ec2_id_kind(association_id, 'subnet')) if subnet is None or 'route_table_id' not in subnet: raise exception.InvalidAssociationIDNotFound( id=association_id) if subnet['vpc_id'] != route_table['vpc_id']: msg = _('Route table association %(rtbassoc_id)s and route table ' '%(rtb_id)s belong to different networks') msg = msg % {'rtbassoc_id': association_id, 'rtb_id': route_table_id} raise exception.InvalidParameterValue(msg) rollabck_route_table_object = db_api.get_item_by_id( context, subnet['route_table_id']) with common.OnCrashCleaner() as cleaner: _associate_subnet_item(context, subnet, route_table['id']) cleaner.addCleanup(_associate_subnet_item, context, subnet, rollabck_route_table_object['id']) _update_subnet_host_routes( context, subnet, route_table, cleaner=cleaner, rollback_route_table_object=rollabck_route_table_object) return {'newAssociationId': association_id} def disassociate_route_table(context, association_id): subnet = db_api.get_item_by_id( context, ec2utils.change_ec2_id_kind(association_id, 'subnet')) if not subnet: vpc = db_api.get_item_by_id( context, ec2utils.change_ec2_id_kind(association_id, 'vpc')) if vpc is None: raise exception.InvalidAssociationIDNotFound( id=association_id) msg = _('Cannot disassociate the main route table association ' '%(rtbassoc_id)s') % {'rtbassoc_id': association_id} raise exception.InvalidParameterValue(msg) if 'route_table_id' not in subnet: raise exception.InvalidAssociationIDNotFound( id=association_id) rollback_route_table_object = db_api.get_item_by_id( context, subnet['route_table_id']) vpc = db_api.get_item_by_id(context, subnet['vpc_id']) main_route_table = db_api.get_item_by_id(context, vpc['route_table_id']) with common.OnCrashCleaner() as cleaner: _disassociate_subnet_item(context, subnet) cleaner.addCleanup(_associate_subnet_item, context, subnet, rollback_route_table_object['id']) _update_subnet_host_routes( context, subnet, main_route_table, cleaner=cleaner, rollback_route_table_object=rollback_route_table_object) return True def delete_route_table(context, route_table_id): route_table = ec2utils.get_db_item(context, route_table_id) vpc = db_api.get_item_by_id(context, route_table['vpc_id']) _delete_route_table(context, route_table['id'], vpc) return True class RouteTableDescriber(common.TaggableItemsDescriber, common.NonOpenstackItemsDescriber): KIND = 'rtb' FILTER_MAP = {'association.route-table-association-id': ( ['associationSet', 'routeTableAssociationId']), 'association.route-table-id': ['associationSet', 'routeTableId'], 'association.subnet-id': ['associationSet', 'subnetId'], 'association.main': ['associationSet', 'main'], 'route-table-id': 'routeTableId', 'route.destination-cidr-block': ['routeSet', 'destinationCidrBlock'], 'route.gateway-id': ['routeSet', 'gatewayId'], 'route.instance-id': ['routeSet', 'instanceId'], 'route.origin': ['routeSet', 'origin'], 'route.state': ['routeSet', 'state'], 'vpc-id': 'vpcId'} def format(self, route_table): return _format_route_table( self.context, route_table, associated_subnet_ids=self.associations[route_table['id']], is_main=(self.vpcs[route_table['vpc_id']]['route_table_id'] == route_table['id']), gateways=self.gateways, network_interfaces=self.network_interfaces) def get_db_items(self): associations = collections.defaultdict(list) for subnet in db_api.get_items(self.context, 'subnet'): if 'route_table_id' in subnet: associations[subnet['route_table_id']].append(subnet['id']) self.associations = associations vpcs = db_api.get_items(self.context, 'vpc') self.vpcs = {vpc['id']: vpc for vpc in vpcs} gateways = db_api.get_items(self.context, 'igw') self.gateways = {igw['id']: igw for igw in gateways} # TODO(ft): scan route tables to get only used instances and # network interfaces to reduce DB and Nova throughput network_interfaces = db_api.get_items(self.context, 'eni') self.network_interfaces = {eni['id']: eni for eni in network_interfaces} return super(RouteTableDescriber, self).get_db_items() def describe_route_tables(context, route_table_id=None, filter=None): formatted_route_tables = RouteTableDescriber().describe( context, ids=route_table_id, filter=filter) return {'routeTableSet': formatted_route_tables} def _create_route_table(context, vpc): route_table = {'vpc_id': vpc['id'], 'routes': [{'destination_cidr_block': vpc['cidr_block'], 'gateway_id': None}]} route_table = db_api.add_item(context, 'rtb', route_table) return route_table def _delete_route_table(context, route_table_id, vpc=None, cleaner=None): def get_associated_subnets(): return [s for s in db_api.get_items(context, 'subnet') if s.get('route_table_id') == route_table_id] if (vpc and route_table_id == vpc['route_table_id'] or len(get_associated_subnets()) > 0): msg = _("The routeTable '%(rtb_id)s' has dependencies and cannot " "be deleted.") % {'rtb_id': route_table_id} raise exception.DependencyViolation(msg) if cleaner: route_table = db_api.get_item_by_id(context, route_table_id) db_api.delete_item(context, route_table_id) if cleaner and route_table: cleaner.addCleanup(db_api.restore_item, context, 'rtb', route_table) def _set_route(context, route_table_id, destination_cidr_block, gateway_id, instance_id, network_interface_id, vpc_peering_connection_id, do_replace): route_table = ec2utils.get_db_item(context, route_table_id) vpc = db_api.get_item_by_id(context, route_table['vpc_id']) vpc_ipnet = netaddr.IPNetwork(vpc['cidr_block']) route_ipnet = netaddr.IPNetwork(destination_cidr_block) if route_ipnet in vpc_ipnet: msg = _('Cannot create a more specific route for ' '%(destination_cidr_block)s than local route ' '%(vpc_cidr_block)s in route table %(rtb_id)s') msg = msg % {'rtb_id': route_table_id, 'destination_cidr_block': destination_cidr_block, 'vpc_cidr_block': vpc['cidr_block']} raise exception.InvalidParameterValue(msg) obj_param_count = len([p for p in (gateway_id, network_interface_id, instance_id, vpc_peering_connection_id) if p is not None]) if obj_param_count != 1: msg = _('The request must contain exactly one of gatewayId, ' 'networkInterfaceId, vpcPeeringConnectionId or instanceId') if obj_param_count == 0: raise exception.MissingParameter(msg) else: raise exception.InvalidParameterCombination(msg) rollabck_route_table_state = copy.deepcopy(route_table) if do_replace: route_count = len(route_table['routes']) route_table['routes'] = [ r for r in route_table['routes'] if r['destination_cidr_block'] != destination_cidr_block] if route_count == len(route_table['routes']): msg = _("There is no route defined for " "'%(destination_cidr_block)s' in the route table. " "Use CreateRoute instead.") msg = msg % {'destination_cidr_block': destination_cidr_block} raise exception.InvalidParameterValue(msg) if gateway_id: gateway = ec2utils.get_db_item(context, gateway_id) if gateway.get('vpc_id') != route_table['vpc_id']: msg = _('Route table %(rtb_id)s and network gateway %(igw_id)s ' 'belong to different networks') msg = msg % {'rtb_id': route_table_id, 'igw_id': gateway_id} raise exception.InvalidParameterValue(msg) route = {'gateway_id': gateway['id']} elif network_interface_id: network_interface = ec2utils.get_db_item(context, network_interface_id) if network_interface['vpc_id'] != route_table['vpc_id']: msg = _('Route table %(rtb_id)s and interface %(eni_id)s ' 'belong to different networks') msg = msg % {'rtb_id': route_table_id, 'eni_id': network_interface_id} raise exception.InvalidParameterValue(msg) route = {'network_interface_id': network_interface['id']} elif instance_id: # TODO(ft): implement search in DB layer network_interfaces = [eni for eni in db_api.get_items(context, 'eni') if eni.get('instance_id') == instance_id] if len(network_interfaces) == 0: msg = _("Invalid value '%(i_id)s' for instance ID. " "Instance is not in a VPC.") msg = msg % {'i_id': instance_id} raise exception.InvalidParameterValue(msg) elif len(network_interfaces) > 1: raise exception.InvalidInstanceId(instance_id=instance_id) network_interface = network_interfaces[0] if network_interface['vpc_id'] != route_table['vpc_id']: msg = _('Route table %(rtb_id)s and interface %(eni_id)s ' 'belong to different networks') msg = msg % {'rtb_id': route_table_id, 'eni_id': network_interface['id']} raise exception.InvalidParameterValue(msg) route = {'network_interface_id': network_interface['id']} else: raise exception.InvalidRequest('Parameter VpcPeeringConnectionId is ' 'not supported by this implementation') route['destination_cidr_block'] = destination_cidr_block if do_replace: idempotent_call = False else: old_route = next((r for r in route_table['routes'] if r['destination_cidr_block'] == destination_cidr_block), None) idempotent_call = old_route == route if old_route and not idempotent_call: raise exception.RouteAlreadyExists( destination_cidr_block=destination_cidr_block) if not idempotent_call: route_table['routes'].append(route) with common.OnCrashCleaner() as cleaner: db_api.update_item(context, route_table) cleaner.addCleanup(db_api.update_item, context, rollabck_route_table_state) _update_routes_in_associated_subnets(context, route_table, cleaner, rollabck_route_table_state) return True def _format_route_table(context, route_table, is_main=False, associated_subnet_ids=[], gateways={}, network_interfaces={}): vpc_id = route_table['vpc_id'] ec2_route_table = {'routeTableId': route_table['id'], 'vpcId': vpc_id, 'routeSet': [], # NOTE(ft): AWS returns empty tag set for a route table # if no tag exists 'tagSet': []} # TODO(ft): refactor to get Nova instances outside of this function nova = clients.nova(context) for route in route_table['routes']: origin = ('CreateRouteTable' if route.get('gateway_id', 0) is None else 'CreateRoute') ec2_route = {'destinationCidrBlock': route['destination_cidr_block'], 'origin': origin} if 'gateway_id' in route: gateway_id = route['gateway_id'] if gateway_id is None: state = 'active' ec2_gateway_id = 'local' else: gateway = gateways.get(gateway_id) state = ('active' if gateway and gateway.get('vpc_id') == vpc_id else 'blackhole') ec2_gateway_id = gateway_id ec2_route.update({'gatewayId': ec2_gateway_id, 'state': state}) else: network_interface_id = route['network_interface_id'] network_interface = network_interfaces.get(network_interface_id) instance_id = (network_interface.get('instance_id') if network_interface else None) state = 'blackhole' if instance_id: instance = db_api.get_item_by_id(context, instance_id) if instance: try: os_instance = nova.servers.get(instance['os_id']) if os_instance and os_instance.status == 'ACTIVE': state = 'active' except nova_exception.NotFound: pass ec2_route.update({'instanceId': instance_id, 'instanceOwnerId': context.project_id}) ec2_route.update({'networkInterfaceId': network_interface_id, 'state': state}) ec2_route_table['routeSet'].append(ec2_route) associations = [] if is_main: associations.append({ 'routeTableAssociationId': ec2utils.change_ec2_id_kind(vpc_id, 'rtbassoc'), 'routeTableId': route_table['id'], 'main': True}) for subnet_id in associated_subnet_ids: associations.append({ 'routeTableAssociationId': ec2utils.change_ec2_id_kind(subnet_id, 'rtbassoc'), 'routeTableId': route_table['id'], 'subnetId': subnet_id, 'main': False}) if associations: ec2_route_table['associationSet'] = associations return ec2_route_table def _update_routes_in_associated_subnets(context, route_table, cleaner, rollabck_route_table_object, is_main=None): if is_main is None: vpc = db_api.get_item_by_id(context, route_table['vpc_id']) is_main = vpc['route_table_id'] == route_table['id'] if is_main: appropriate_rtb_ids = (route_table['id'], None) else: appropriate_rtb_ids = (route_table['id'],) router_objects = _get_router_objects(context, route_table) neutron = clients.neutron(context) for subnet in db_api.get_items(context, 'subnet'): if (subnet['vpc_id'] == route_table['vpc_id'] and subnet.get('route_table_id') in appropriate_rtb_ids): _update_subnet_host_routes( context, subnet, route_table, cleaner=cleaner, rollback_route_table_object=rollabck_route_table_object, router_objects=router_objects, neutron=neutron) def _update_subnet_host_routes(context, subnet, route_table, cleaner=None, rollback_route_table_object=None, router_objects=None, neutron=None): neutron = neutron or clients.neutron(context) os_subnet = neutron.show_subnet(subnet['os_id'])['subnet'] gateway_ip = str(netaddr.IPAddress( netaddr.IPNetwork(os_subnet['cidr']).first + 1)) host_routes = _get_subnet_host_routes(context, route_table, gateway_ip, router_objects) neutron.update_subnet(subnet['os_id'], {'subnet': {'host_routes': host_routes}}) if cleaner and rollback_route_table_object: cleaner.addCleanup(_update_subnet_host_routes, context, subnet, rollback_route_table_object) def _get_router_objects(context, route_table): return dict((route['gateway_id'], db_api.get_item_by_id(context, route['gateway_id'])) if route.get('gateway_id') else (route['network_interface_id'], db_api.get_item_by_id(context, route['network_interface_id'])) for route in route_table['routes'] if route.get('gateway_id') or 'network_interface_id' in route) def _get_subnet_host_routes(context, route_table, gateway_ip, router_objects=None): def get_nexthop(route): if 'gateway_id' in route: gateway_id = route['gateway_id'] if gateway_id: gateway = (router_objects[route['gateway_id']] if router_objects else db_api.get_item_by_id(context, gateway_id)) if (not gateway or gateway.get('vpc_id') != route_table['vpc_id']): return '127.0.0.1' return gateway_ip network_interface = ( router_objects[route['network_interface_id']] if router_objects else db_api.get_item_by_id(context, route['network_interface_id'])) if not network_interface: return '127.0.0.1' return network_interface['private_ip_address'] host_routes = [{'destination': route['destination_cidr_block'], 'nexthop': get_nexthop(route)} for route in route_table['routes']] if not any(r['destination'] == '0.0.0.0/0' for r in host_routes): host_routes.append({'destination': '0.0.0.0/0', 'nexthop': '127.0.0.1'}) return host_routes def _associate_subnet_item(context, subnet, route_table_id): subnet['route_table_id'] = route_table_id db_api.update_item(context, subnet) def _disassociate_subnet_item(context, subnet): subnet.pop('route_table_id') db_api.update_item(context, subnet) def _associate_vpc_item(context, vpc, route_table_id): vpc['route_table_id'] = route_table_id db_api.update_item(context, vpc)