OpenStack Networking (Neutron)
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neutron/neutron/agent/l3/dvr_edge_router.py

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# Copyright (c) 2015 OpenStack Foundation
#
# 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.
from neutron_lib import constants as l3_constants
from oslo_log import log as logging
from neutron._i18n import _LE
from neutron.agent.l3 import dvr_local_router
from neutron.agent.l3 import dvr_snat_ns
from neutron.agent.l3 import router_info as router
from neutron.agent.linux import ip_lib
from neutron.agent.linux import iptables_manager
LOG = logging.getLogger(__name__)
class DvrEdgeRouter(dvr_local_router.DvrLocalRouter):
def __init__(self, agent, host, *args, **kwargs):
super(DvrEdgeRouter, self).__init__(agent, host, *args, **kwargs)
self.snat_namespace = None
self.snat_iptables_manager = None
def external_gateway_added(self, ex_gw_port, interface_name):
super(DvrEdgeRouter, self).external_gateway_added(
ex_gw_port, interface_name)
if self._is_this_snat_host():
self._create_dvr_gateway(ex_gw_port, interface_name)
# NOTE: When a router is created without a gateway the routes get
# added to the router namespace, but if we wanted to populate
# the same routes to the snat namespace after the gateway port
# is added, we need to call routes_updated here.
self.routes_updated([], self.router['routes'])
def external_gateway_updated(self, ex_gw_port, interface_name):
if not self._is_this_snat_host():
# no centralized SNAT gateway for this node/agent
LOG.debug("not hosting snat for router: %s", self.router['id'])
if self.snat_namespace:
LOG.debug("SNAT was rescheduled to host %s. Clearing snat "
"namespace.", self.router.get('gw_port_host'))
return self.external_gateway_removed(
ex_gw_port, interface_name)
return
if not self.snat_namespace:
# SNAT might be rescheduled to this agent; need to process like
# newly created gateway
return self.external_gateway_added(ex_gw_port, interface_name)
else:
self._external_gateway_added(ex_gw_port,
interface_name,
self.snat_namespace.name,
preserve_ips=[])
def _external_gateway_removed(self, ex_gw_port, interface_name):
super(DvrEdgeRouter, self).external_gateway_removed(ex_gw_port,
interface_name)
if not self._is_this_snat_host() and not self.snat_namespace:
# no centralized SNAT gateway for this node/agent
LOG.debug("not hosting snat for router: %s", self.router['id'])
return
self.driver.unplug(interface_name,
bridge=self.agent_conf.external_network_bridge,
namespace=self.snat_namespace.name,
prefix=router.EXTERNAL_DEV_PREFIX)
def external_gateway_removed(self, ex_gw_port, interface_name):
self._external_gateway_removed(ex_gw_port, interface_name)
if self.snat_namespace:
self.snat_namespace.delete()
self.snat_namespace = None
def internal_network_added(self, port):
super(DvrEdgeRouter, self).internal_network_added(port)
# TODO(gsagie) some of this checks are already implemented
# in the base class, think how to avoid re-doing them
if not self._is_this_snat_host():
return
sn_port = self.get_snat_port_for_internal_port(port)
if not sn_port:
return
ns_name = dvr_snat_ns.SnatNamespace.get_snat_ns_name(self.router['id'])
interface_name = self._get_snat_int_device_name(sn_port['id'])
self._internal_network_added(
ns_name,
sn_port['network_id'],
sn_port['id'],
sn_port['fixed_ips'],
sn_port['mac_address'],
interface_name,
dvr_snat_ns.SNAT_INT_DEV_PREFIX,
mtu=sn_port.get('mtu'))
def _dvr_internal_network_removed(self, port):
super(DvrEdgeRouter, self)._dvr_internal_network_removed(port)
if not self.ex_gw_port:
return
sn_port = self.get_snat_port_for_internal_port(port, self.snat_ports)
if not sn_port:
return
if not self._is_this_snat_host():
return
snat_interface = self._get_snat_int_device_name(sn_port['id'])
ns_name = self.snat_namespace.name
prefix = dvr_snat_ns.SNAT_INT_DEV_PREFIX
if ip_lib.device_exists(snat_interface, namespace=ns_name):
self.driver.unplug(snat_interface, namespace=ns_name,
prefix=prefix)
def _plug_snat_port(self, port):
interface_name = self._get_snat_int_device_name(port['id'])
self._internal_network_added(
self.snat_namespace.name, port['network_id'],
port['id'], port['fixed_ips'],
port['mac_address'], interface_name,
dvr_snat_ns.SNAT_INT_DEV_PREFIX,
mtu=port.get('mtu'))
def _create_dvr_gateway(self, ex_gw_port, gw_interface_name):
"""Create SNAT namespace."""
snat_ns = self._create_snat_namespace()
# connect snat_ports to br_int from SNAT namespace
for port in self.get_snat_interfaces():
# create interface_name
self._plug_snat_port(port)
self._external_gateway_added(ex_gw_port, gw_interface_name,
snat_ns.name, preserve_ips=[])
self.snat_iptables_manager = iptables_manager.IptablesManager(
namespace=snat_ns.name,
use_ipv6=self.use_ipv6)
def _create_snat_namespace(self):
# TODO(mlavalle): in the near future, this method should contain the
# code in the L3 agent that creates a gateway for a dvr. The first step
# is to move the creation of the snat namespace here
self.snat_namespace = dvr_snat_ns.SnatNamespace(self.router['id'],
self.agent_conf,
self.driver,
self.use_ipv6)
self.snat_namespace.create()
return self.snat_namespace
def _get_snat_int_device_name(self, port_id):
long_name = dvr_snat_ns.SNAT_INT_DEV_PREFIX + port_id
return long_name[:self.driver.DEV_NAME_LEN]
def _is_this_snat_host(self):
host = self.router.get('gw_port_host')
if not host:
LOG.debug("gw_port_host missing from router: %s",
self.router['id'])
return host == self.host
def _handle_router_snat_rules(self, ex_gw_port, interface_name):
super(DvrEdgeRouter, self)._handle_router_snat_rules(
ex_gw_port, interface_name)
if not self._is_this_snat_host():
return
if not self.get_ex_gw_port():
return
if not self.snat_iptables_manager:
LOG.debug("DVR router: no snat rules to be handled")
return
with self.snat_iptables_manager.defer_apply():
self._empty_snat_chains(self.snat_iptables_manager)
# NOTE: DVR adds the jump to float snat via super class,
# but that is in the router namespace and not snat.
self._add_snat_rules(ex_gw_port, self.snat_iptables_manager,
interface_name)
def update_routing_table(self, operation, route):
if self.get_ex_gw_port() and self._is_this_snat_host():
ns_name = dvr_snat_ns.SnatNamespace.get_snat_ns_name(
self.router['id'])
# NOTE: For now let us apply the static routes both in SNAT
# namespace and Router Namespace, to reduce the complexity.
ip_wrapper = ip_lib.IPWrapper(namespace=ns_name)
if ip_wrapper.netns.exists(ns_name):
super(DvrEdgeRouter, self)._update_routing_table(
operation, route, namespace=ns_name)
else:
LOG.error(_LE("The SNAT namespace %s does not exist for "
"the router."), ns_name)
super(DvrEdgeRouter, self).update_routing_table(operation, route)
def delete(self, agent):
super(DvrEdgeRouter, self).delete(agent)
if self.snat_namespace:
self.snat_namespace.delete()
def process_address_scope(self):
super(DvrEdgeRouter, self).process_address_scope()
if not self._is_this_snat_host():
return
if not self.snat_iptables_manager:
LOG.debug("DVR router: no snat rules to be handled")
return
# Prepare address scope iptables rule for dvr snat interfaces
internal_ports = self.get_snat_interfaces()
ports_scopemark = self._get_port_devicename_scopemark(
internal_ports, self._get_snat_int_device_name)
# Prepare address scope iptables rule for external port
external_port = self.get_ex_gw_port()
if external_port:
external_port_scopemark = self._get_port_devicename_scopemark(
[external_port], self.get_external_device_name)
for ip_version in (l3_constants.IP_VERSION_4,
l3_constants.IP_VERSION_6):
ports_scopemark[ip_version].update(
external_port_scopemark[ip_version])
with self.snat_iptables_manager.defer_apply():
self._add_address_scope_mark(
self.snat_iptables_manager, ports_scopemark)