OpenStack Networking (Neutron)
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# Copyright 2014 Cisco Systems, 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 netaddr
from netaddr import core as net_exc
from neutron.common import exceptions
from neutron.common import rpc as n_rpc
from neutron.openstack.common import excutils
from neutron.openstack.common import log as logging
from neutron.openstack.common import rpc
from neutron.plugins.common import constants
from neutron.services.vpn.common import topics
from neutron.services.vpn import service_drivers
from neutron.services.vpn.service_drivers import cisco_csr_db as csr_id_map
LOG = logging.getLogger(__name__)
IPSEC = 'ipsec'
BASE_IPSEC_VERSION = '1.0'
LIFETIME_LIMITS = {'IKE Policy': {'min': 60, 'max': 86400},
'IPSec Policy': {'min': 120, 'max': 2592000}}
MIN_CSR_MTU = 1500
MAX_CSR_MTU = 9192
class CsrValidationFailure(exceptions.BadRequest):
message = _("Cisco CSR does not support %(resource)s attribute %(key)s "
"with value '%(value)s'")
class CsrUnsupportedError(exceptions.NeutronException):
message = _("Cisco CSR does not currently support %(capability)s")
class CiscoCsrIPsecVpnDriverCallBack(object):
"""Handler for agent to plugin RPC messaging."""
# history
# 1.0 Initial version
RPC_API_VERSION = BASE_IPSEC_VERSION
def __init__(self, driver):
self.driver = driver
def create_rpc_dispatcher(self):
return n_rpc.PluginRpcDispatcher([self])
def get_vpn_services_on_host(self, context, host=None):
"""Retuns info on the vpnservices on the host."""
plugin = self.driver.service_plugin
vpnservices = plugin._get_agent_hosting_vpn_services(
context, host)
return [self.driver._make_vpnservice_dict(vpnservice, context)
for vpnservice in vpnservices]
def update_status(self, context, status):
"""Update status of all vpnservices."""
plugin = self.driver.service_plugin
plugin.update_status_by_agent(context, status)
class CiscoCsrIPsecVpnAgentApi(service_drivers.BaseIPsecVpnAgentApi):
"""API and handler for Cisco IPSec plugin to agent RPC messaging."""
RPC_API_VERSION = BASE_IPSEC_VERSION
def __init__(self, topic, default_version):
super(CiscoCsrIPsecVpnAgentApi, self).__init__(
topics.CISCO_IPSEC_AGENT_TOPIC, topic, default_version)
class CiscoCsrIPsecVPNDriver(service_drivers.VpnDriver):
"""Cisco CSR VPN Service Driver class for IPsec."""
def __init__(self, service_plugin):
super(CiscoCsrIPsecVPNDriver, self).__init__(service_plugin)
self.callbacks = CiscoCsrIPsecVpnDriverCallBack(self)
self.conn = rpc.create_connection(new=True)
self.conn.create_consumer(
topics.CISCO_IPSEC_DRIVER_TOPIC,
self.callbacks.create_rpc_dispatcher(),
fanout=False)
self.conn.consume_in_thread()
self.agent_rpc = CiscoCsrIPsecVpnAgentApi(
topics.CISCO_IPSEC_AGENT_TOPIC, BASE_IPSEC_VERSION)
@property
def service_type(self):
return IPSEC
def validate_lifetime(self, for_policy, policy_info):
"""Ensure lifetime in secs and value is supported, based on policy."""
units = policy_info['lifetime']['units']
if units != 'seconds':
raise CsrValidationFailure(resource=for_policy,
key='lifetime:units',
value=units)
value = policy_info['lifetime']['value']
if (value < LIFETIME_LIMITS[for_policy]['min'] or
value > LIFETIME_LIMITS[for_policy]['max']):
raise CsrValidationFailure(resource=for_policy,
key='lifetime:value',
value=value)
def validate_ike_version(self, policy_info):
"""Ensure IKE policy is v1 for current REST API."""
version = policy_info['ike_version']
if version != 'v1':
raise CsrValidationFailure(resource='IKE Policy',
key='ike_version',
value=version)
def validate_mtu(self, conn_info):
"""Ensure the MTU value is supported."""
mtu = conn_info['mtu']
if mtu < MIN_CSR_MTU or mtu > MAX_CSR_MTU:
raise CsrValidationFailure(resource='IPSec Connection',
key='mtu',
value=mtu)
def validate_public_ip_present(self, vpn_service):
"""Ensure there is one gateway IP specified for the router used."""
gw_port = vpn_service.router.gw_port
if not gw_port or len(gw_port.fixed_ips) != 1:
raise CsrValidationFailure(resource='IPSec Connection',
key='router:gw_port:ip_address',
value='missing')
def validate_peer_id(self, ipsec_conn):
"""Ensure that an IP address is specified for peer ID."""
# TODO(pcm) Should we check peer_address too?
peer_id = ipsec_conn['peer_id']
try:
netaddr.IPAddress(peer_id)
except net_exc.AddrFormatError:
raise CsrValidationFailure(resource='IPSec Connection',
key='peer_id', value=peer_id)
def validate_ipsec_connection(self, context, ipsec_conn, vpn_service):
"""Validate attributes w.r.t. Cisco CSR capabilities."""
ike_policy = self.service_plugin.get_ikepolicy(
context, ipsec_conn['ikepolicy_id'])
ipsec_policy = self.service_plugin.get_ipsecpolicy(
context, ipsec_conn['ipsecpolicy_id'])
self.validate_lifetime('IKE Policy', ike_policy)
self.validate_lifetime('IPSec Policy', ipsec_policy)
self.validate_ike_version(ike_policy)
self.validate_mtu(ipsec_conn)
self.validate_public_ip_present(vpn_service)
self.validate_peer_id(ipsec_conn)
LOG.debug(_("IPSec connection %s validated for Cisco CSR"),
ipsec_conn['id'])
def create_ipsec_site_connection(self, context, ipsec_site_connection):
vpnservice = self.service_plugin._get_vpnservice(
context, ipsec_site_connection['vpnservice_id'])
try:
self.validate_ipsec_connection(context, ipsec_site_connection,
vpnservice)
except CsrValidationFailure:
with excutils.save_and_reraise_exception():
self.service_plugin.update_ipsec_site_conn_status(
context, ipsec_site_connection['id'], constants.ERROR)
csr_id_map.create_tunnel_mapping(context, ipsec_site_connection)
self.agent_rpc.vpnservice_updated(context, vpnservice['router_id'])
def update_ipsec_site_connection(
self, context, old_ipsec_site_connection, ipsec_site_connection):
capability = _("update of IPSec connections. You can delete and "
"re-add, as a workaround.")
raise CsrUnsupportedError(capability=capability)
def delete_ipsec_site_connection(self, context, ipsec_site_connection):
vpnservice = self.service_plugin._get_vpnservice(
context, ipsec_site_connection['vpnservice_id'])
self.agent_rpc.vpnservice_updated(context, vpnservice['router_id'])
def create_ikepolicy(self, context, ikepolicy):
pass
def delete_ikepolicy(self, context, ikepolicy):
pass
def update_ikepolicy(self, context, old_ikepolicy, ikepolicy):
pass
def create_ipsecpolicy(self, context, ipsecpolicy):
pass
def delete_ipsecpolicy(self, context, ipsecpolicy):
pass
def update_ipsecpolicy(self, context, old_ipsec_policy, ipsecpolicy):
pass
def create_vpnservice(self, context, vpnservice):
pass
def update_vpnservice(self, context, old_vpnservice, vpnservice):
self.agent_rpc.vpnservice_updated(context, vpnservice['router_id'])
def delete_vpnservice(self, context, vpnservice):
self.agent_rpc.vpnservice_updated(context, vpnservice['router_id'])
def get_cisco_connection_mappings(self, conn_id, context):
"""Obtain persisted mappings for IDs related to connection."""
tunnel_id, ike_id, ipsec_id = csr_id_map.get_tunnel_mapping_for(
conn_id, context.session)
return {'site_conn_id': u'Tunnel%d' % tunnel_id,
'ike_policy_id': u'%d' % ike_id,
'ipsec_policy_id': u'%s' % ipsec_id}
def _make_vpnservice_dict(self, vpnservice, context):
"""Collect all info on service, including Cisco info per IPSec conn."""
vpnservice_dict = dict(vpnservice)
vpnservice_dict['ipsec_conns'] = []
vpnservice_dict['subnet'] = dict(
vpnservice.subnet)
vpnservice_dict['external_ip'] = vpnservice.router.gw_port[
'fixed_ips'][0]['ip_address']
for ipsec_conn in vpnservice.ipsec_site_connections:
ipsec_conn_dict = dict(ipsec_conn)
ipsec_conn_dict['ike_policy'] = dict(ipsec_conn.ikepolicy)
ipsec_conn_dict['ipsec_policy'] = dict(ipsec_conn.ipsecpolicy)
ipsec_conn_dict['peer_cidrs'] = [
peer_cidr.cidr for peer_cidr in ipsec_conn.peer_cidrs]
ipsec_conn_dict['cisco'] = self.get_cisco_connection_mappings(
ipsec_conn['id'], context)
vpnservice_dict['ipsec_conns'].append(ipsec_conn_dict)
return vpnservice_dict