f8a870ac30
Currently, the Cisco VPN drivers use two routers for the proof of concept
solution. A Neutron router provides access to the public and private
subnets, and a Cisco CSR (out-of-band) provides the VPN tunneling.
The end goal is to integrate the Cisco VPN drivers with the Cisco L3
routing plugin being developed (as a separate blueprint), allowing an
in-band CSR to be used as a Neutron router for VPN functionality.
This commit provides an incremental approach to that goal, by modifying
the Cisco VPN drivers to be able to dynamically obtain CSR info from
an INI file, instead of statically reading the INI file at start-up.
A CSR VM can be created out-of-band (or in-band using Nova) and the INI
file can be updated with the router info. Then, the Cisco VPN driver
can use that information (dynamically) to create IPSec connections.
Once the Cisco L3 router plugin is available, the INI file will be
removed, and two calls to the plugin will be used to obtain the needed
router information, for an integrated solution.
The main advantages are:
- Dynamically use the CSR for VPN.
- Less manual intervention and setup.
- Easy migration to final solution.
- No dependency on the Cisco L3 router plugin implementation.
Note 1: The INI unit tests are moved from device driver to service
driver and modified.
Note 2: I added a unit test for deleting IPSec site-to-site connection,
which was missing (pass).
Note 3: For more details on the change, you can view this Google Doc:
http://goo.gl/DXir8c
Change-Id: I307fc79952e3e12a0f77679ac1fc2b314fa63684
Partially-Implements: blueprint cisco-vpnaas-with-cisco-csr-router
223 lines
9.1 KiB
Python
223 lines
9.1 KiB
Python
# Copyright 2014 Cisco Systems, Inc. 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.common import rpc as n_rpc
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from neutron.db.vpn import vpn_db
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from neutron.openstack.common import log as logging
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from neutron.services.vpn.common import topics
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from neutron.services.vpn import service_drivers
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from neutron.services.vpn.service_drivers import (
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cisco_cfg_loader as via_cfg_file)
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from neutron.services.vpn.service_drivers import cisco_csr_db as csr_id_map
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from neutron.services.vpn.service_drivers import cisco_validator
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LOG = logging.getLogger(__name__)
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IPSEC = 'ipsec'
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BASE_IPSEC_VERSION = '1.0'
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LIFETIME_LIMITS = {'IKE Policy': {'min': 60, 'max': 86400},
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'IPSec Policy': {'min': 120, 'max': 2592000}}
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MIN_CSR_MTU = 1500
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MAX_CSR_MTU = 9192
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class CiscoCsrIPsecVpnDriverCallBack(n_rpc.RpcCallback):
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"""Handler for agent to plugin RPC messaging."""
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# history
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# 1.0 Initial version
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RPC_API_VERSION = BASE_IPSEC_VERSION
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def __init__(self, driver):
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super(CiscoCsrIPsecVpnDriverCallBack, self).__init__()
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self.driver = driver
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def create_rpc_dispatcher(self):
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return n_rpc.PluginRpcDispatcher([self])
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def get_vpn_services_using(self, context, router_id):
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query = context.session.query(vpn_db.VPNService)
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query = query.join(vpn_db.IPsecSiteConnection)
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query = query.join(vpn_db.IKEPolicy)
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query = query.join(vpn_db.IPsecPolicy)
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query = query.join(vpn_db.IPsecPeerCidr)
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query = query.filter(vpn_db.VPNService.router_id == router_id)
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return query.all()
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def get_vpn_services_on_host(self, context, host=None):
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"""Returns info on the VPN services on the host."""
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routers = via_cfg_file.get_active_routers_for_host(context, host)
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host_vpn_services = []
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for router in routers:
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vpn_services = self.get_vpn_services_using(context, router['id'])
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for vpn_service in vpn_services:
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host_vpn_services.append(
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self.driver._make_vpnservice_dict(context, vpn_service,
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router))
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return host_vpn_services
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def update_status(self, context, status):
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"""Update status of all vpnservices."""
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plugin = self.driver.service_plugin
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plugin.update_status_by_agent(context, status)
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class CiscoCsrIPsecVpnAgentApi(service_drivers.BaseIPsecVpnAgentApi,
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n_rpc.RpcCallback):
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"""API and handler for Cisco IPSec plugin to agent RPC messaging."""
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RPC_API_VERSION = BASE_IPSEC_VERSION
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def __init__(self, topic, default_version, driver):
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super(CiscoCsrIPsecVpnAgentApi, self).__init__(
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topic, default_version, driver)
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def _agent_notification(self, context, method, router_id,
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version=None, **kwargs):
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"""Notify update for the agent.
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Find the host for the router being notified and then
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dispatches a notification for the VPN device driver.
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"""
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admin_context = context.is_admin and context or context.elevated()
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if not version:
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version = self.RPC_API_VERSION
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host = via_cfg_file.get_host_for_router(admin_context, router_id)
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if not host:
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# NOTE: This is a config error for workaround. At this point we
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# can't set state of resource to error.
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return
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LOG.debug(_('Notify agent at %(topic)s.%(host)s the message '
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'%(method)s %(args)s for router %(router)s'),
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{'topic': self.topic,
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'host': host,
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'method': method,
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'args': kwargs,
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'router': router_id})
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self.cast(context, self.make_msg(method, **kwargs),
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version=version,
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topic='%s.%s' % (self.topic, host))
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class CiscoCsrIPsecVPNDriver(service_drivers.VpnDriver):
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"""Cisco CSR VPN Service Driver class for IPsec."""
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def __init__(self, service_plugin):
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super(CiscoCsrIPsecVPNDriver, self).__init__(
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service_plugin,
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cisco_validator.CiscoCsrVpnValidator(service_plugin))
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self.endpoints = [CiscoCsrIPsecVpnDriverCallBack(self)]
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self.conn = n_rpc.create_connection(new=True)
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self.conn.create_consumer(
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topics.CISCO_IPSEC_DRIVER_TOPIC, self.endpoints, fanout=False)
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self.conn.consume_in_threads()
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self.agent_rpc = CiscoCsrIPsecVpnAgentApi(
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topics.CISCO_IPSEC_AGENT_TOPIC, BASE_IPSEC_VERSION, self)
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@property
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def service_type(self):
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return IPSEC
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def create_ipsec_site_connection(self, context, ipsec_site_connection):
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vpnservice = self.service_plugin._get_vpnservice(
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context, ipsec_site_connection['vpnservice_id'])
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csr_id_map.create_tunnel_mapping(context, ipsec_site_connection)
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self.agent_rpc.vpnservice_updated(context, vpnservice['router_id'],
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reason='ipsec-conn-create')
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def update_ipsec_site_connection(
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self, context, old_ipsec_site_connection, ipsec_site_connection):
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vpnservice = self.service_plugin._get_vpnservice(
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context, ipsec_site_connection['vpnservice_id'])
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self.agent_rpc.vpnservice_updated(
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context, vpnservice['router_id'],
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reason='ipsec-conn-update')
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def delete_ipsec_site_connection(self, context, ipsec_site_connection):
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vpnservice = self.service_plugin._get_vpnservice(
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context, ipsec_site_connection['vpnservice_id'])
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self.agent_rpc.vpnservice_updated(context, vpnservice['router_id'],
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reason='ipsec-conn-delete')
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def create_ikepolicy(self, context, ikepolicy):
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pass
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def delete_ikepolicy(self, context, ikepolicy):
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pass
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def update_ikepolicy(self, context, old_ikepolicy, ikepolicy):
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pass
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def create_ipsecpolicy(self, context, ipsecpolicy):
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pass
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def delete_ipsecpolicy(self, context, ipsecpolicy):
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pass
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def update_ipsecpolicy(self, context, old_ipsec_policy, ipsecpolicy):
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pass
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def create_vpnservice(self, context, vpnservice):
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pass
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def update_vpnservice(self, context, old_vpnservice, vpnservice):
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self.agent_rpc.vpnservice_updated(context, vpnservice['router_id'],
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reason='vpn-service-update')
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def delete_vpnservice(self, context, vpnservice):
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self.agent_rpc.vpnservice_updated(context, vpnservice['router_id'],
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reason='vpn-service-delete')
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def get_cisco_connection_mappings(self, conn_id, context):
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"""Obtain persisted mappings for IDs related to connection."""
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tunnel_id, ike_id, ipsec_id = csr_id_map.get_tunnel_mapping_for(
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conn_id, context.session)
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return {'site_conn_id': u'Tunnel%d' % tunnel_id,
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'ike_policy_id': u'%d' % ike_id,
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'ipsec_policy_id': u'%s' % ipsec_id}
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def _create_tunnel_interface(self, router_info):
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return router_info['tunnel_if']
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def _get_router_info(self, router_info):
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hosting_device = router_info['hosting_device']
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return {'rest_mgmt_ip': hosting_device['management_ip_address'],
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'external_ip': router_info['tunnel_ip'],
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'username': hosting_device['credentials']['username'],
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'password': hosting_device['credentials']['password'],
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'tunnel_if_name': self._create_tunnel_interface(router_info),
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# TODO(pcm): Add protocol_port, if avail from L3 router plugin
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'timeout': 30} # Hard-coded for now
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def _make_vpnservice_dict(self, context, vpnservice, router_info):
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"""Collect all service info, including Cisco info for IPSec conn."""
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vpnservice_dict = dict(vpnservice)
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vpnservice_dict['ipsec_conns'] = []
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vpnservice_dict['subnet'] = dict(vpnservice.subnet)
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vpnservice_dict['router_info'] = self._get_router_info(router_info)
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for ipsec_conn in vpnservice.ipsec_site_connections:
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ipsec_conn_dict = dict(ipsec_conn)
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ipsec_conn_dict['ike_policy'] = dict(ipsec_conn.ikepolicy)
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ipsec_conn_dict['ipsec_policy'] = dict(ipsec_conn.ipsecpolicy)
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ipsec_conn_dict['peer_cidrs'] = [
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peer_cidr.cidr for peer_cidr in ipsec_conn.peer_cidrs]
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ipsec_conn_dict['cisco'] = self.get_cisco_connection_mappings(
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ipsec_conn['id'], context)
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vpnservice_dict['ipsec_conns'].append(ipsec_conn_dict)
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return vpnservice_dict
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