2df5424361
Fixes bug 1122206 If multiple instances of l3_agent are running on the same host, all qrouter- namespaces will be destroyed as new l3_agents are started. This fix allows for multiple l3_agents to be running on the same host when router_id is set for each agent. Change-Id: I879cdc6faba94900f831232232d67e471c70d778
632 lines
26 KiB
Python
632 lines
26 KiB
Python
"""
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright 2012 Nicira Networks, 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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#
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# @author: Dan Wendlandt, Nicira, Inc
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#
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"""
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import sys
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import eventlet
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from eventlet import semaphore
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import netaddr
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from quantum.agent.common import config
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from quantum.agent.linux import external_process
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from quantum.agent.linux import interface
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from quantum.agent.linux import ip_lib
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from quantum.agent.linux import iptables_manager
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from quantum.agent.linux import utils
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from quantum.common import constants as l3_constants
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from quantum.common import topics
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from quantum import context
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from quantum import manager
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from quantum.openstack.common import cfg
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from quantum.openstack.common import importutils
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from quantum.openstack.common import log as logging
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from quantum.openstack.common import periodic_task
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from quantum.openstack.common.rpc import common as rpc_common
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from quantum.openstack.common.rpc import proxy
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from quantum.openstack.common import service
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from quantum import service as quantum_service
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LOG = logging.getLogger(__name__)
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NS_PREFIX = 'qrouter-'
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INTERNAL_DEV_PREFIX = 'qr-'
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EXTERNAL_DEV_PREFIX = 'qg-'
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class L3PluginApi(proxy.RpcProxy):
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"""Agent side of the l3 agent RPC API.
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API version history:
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1.0 - Initial version.
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"""
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BASE_RPC_API_VERSION = '1.0'
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def __init__(self, topic, host):
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super(L3PluginApi, self).__init__(
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topic=topic, default_version=self.BASE_RPC_API_VERSION)
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self.host = host
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def get_routers(self, context, fullsync=True, router_id=None):
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"""Make a remote process call to retrieve the sync data for routers."""
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router_ids = [router_id] if router_id else None
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return self.call(context,
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self.make_msg('sync_routers', host=self.host,
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fullsync=fullsync,
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router_ids=router_ids),
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topic=self.topic)
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def get_external_network_id(self, context):
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"""Make a remote process call to retrieve the external network id.
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@raise common.RemoteError: with TooManyExternalNetworks
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as exc_type if there are
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more than one external network
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"""
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return self.call(context,
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self.make_msg('get_external_network_id',
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host=self.host),
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topic=self.topic)
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class RouterInfo(object):
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def __init__(self, router_id, root_helper, use_namespaces, router=None):
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self.router_id = router_id
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self.ex_gw_port = None
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self.internal_ports = []
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self.floating_ips = []
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self.root_helper = root_helper
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self.use_namespaces = use_namespaces
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self.router = router
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self.iptables_manager = iptables_manager.IptablesManager(
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root_helper=root_helper,
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#FIXME(danwent): use_ipv6=True,
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namespace=self.ns_name())
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def ns_name(self):
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if self.use_namespaces:
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return NS_PREFIX + self.router_id
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class L3NATAgent(manager.Manager):
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OPTS = [
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cfg.StrOpt('external_network_bridge', default='br-ex',
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help=_("Name of bridge used for external network "
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"traffic.")),
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cfg.StrOpt('interface_driver',
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help=_("The driver used to manage the virtual "
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"interface.")),
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cfg.IntOpt('metadata_port',
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default=9697,
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help=_("TCP Port used by Quantum metadata namespace "
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"proxy.")),
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cfg.IntOpt('send_arp_for_ha',
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default=3,
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help=_("Send this many gratuitous ARPs for HA setup, "
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"set it below or equal to 0 to disable this "
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"feature.")),
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cfg.BoolOpt('use_namespaces', default=True,
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help=_("Allow overlapping IP.")),
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cfg.StrOpt('router_id', default='',
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help=_("If namespaces is disabled, the l3 agent can only"
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" confgure a router that has the matching router "
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"ID.")),
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cfg.BoolOpt('handle_internal_only_routers',
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default=True,
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help=_("Agent should implement routers with no gateway")),
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cfg.StrOpt('gateway_external_network_id', default='',
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help=_("UUID of external network for routers implemented "
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"by the agents.")),
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cfg.StrOpt('l3_agent_manager',
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default='quantum.agent.l3_agent.L3NATAgent',
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help=_("The Quantum L3 Agent manager.")),
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]
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def __init__(self, host, conf=None):
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if conf:
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self.conf = conf
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else:
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self.conf = cfg.CONF
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self.root_helper = config.get_root_helper(self.conf)
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self.router_info = {}
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if not self.conf.interface_driver:
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LOG.error(_('An interface driver must be specified'))
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sys.exit(1)
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try:
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self.driver = importutils.import_object(self.conf.interface_driver,
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self.conf)
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except:
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LOG.exception(_("Error importing interface driver '%s'"),
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self.conf.interface_driver)
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sys.exit(1)
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self.plugin_rpc = L3PluginApi(topics.PLUGIN, host)
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self.fullsync = True
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self.sync_sem = semaphore.Semaphore(1)
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if self.conf.use_namespaces:
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self._destroy_router_namespaces(self.conf.router_id)
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super(L3NATAgent, self).__init__(host=self.conf.host)
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def _destroy_router_namespaces(self, only_router_id=None):
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"""Destroy router namespaces on the host to eliminate all stale
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linux devices, iptables rules, and namespaces.
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If only_router_id is passed, only destroy single namespace, to allow
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for multiple l3 agents on the same host, without stepping on each
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other's toes on init. This only makes sense if router_id is set.
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"""
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root_ip = ip_lib.IPWrapper(self.root_helper)
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for ns in root_ip.get_namespaces(self.root_helper):
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if ns.startswith(NS_PREFIX):
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if only_router_id and not ns.endswith(only_router_id):
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continue
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try:
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self._destroy_router_namespace(ns)
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except:
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LOG.exception(_("Failed deleting namespace '%s'"), ns)
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def _destroy_router_namespace(self, namespace):
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ns_ip = ip_lib.IPWrapper(self.root_helper, namespace=namespace)
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for d in ns_ip.get_devices(exclude_loopback=True):
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if d.name.startswith(INTERNAL_DEV_PREFIX):
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# device is on default bridge
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self.driver.unplug(d.name, namespace=namespace,
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prefix=INTERNAL_DEV_PREFIX)
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elif d.name.startswith(EXTERNAL_DEV_PREFIX):
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self.driver.unplug(d.name,
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bridge=self.conf.external_network_bridge,
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namespace=namespace,
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prefix=EXTERNAL_DEV_PREFIX)
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#(TODO) Address the failure for the deletion of the namespace
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def _create_router_namespace(self, ri):
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ip_wrapper_root = ip_lib.IPWrapper(self.root_helper)
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ip_wrapper = ip_wrapper_root.ensure_namespace(ri.ns_name())
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ip_wrapper.netns.execute(['sysctl', '-w', 'net.ipv4.ip_forward=1'])
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def _fetch_external_net_id(self):
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"""Find UUID of single external network for this agent"""
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if self.conf.gateway_external_network_id:
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return self.conf.gateway_external_network_id
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try:
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return self.plugin_rpc.get_external_network_id(
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context.get_admin_context())
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except rpc_common.RemoteError as e:
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if e.exc_type == 'TooManyExternalNetworks':
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msg = _(
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"The 'gateway_external_network_id' must be configured"
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" if Quantum has more than one external network.")
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raise Exception(msg)
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else:
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raise
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def _router_added(self, router_id, router=None):
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ri = RouterInfo(router_id, self.root_helper,
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self.conf.use_namespaces, router)
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self.router_info[router_id] = ri
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if self.conf.use_namespaces:
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self._create_router_namespace(ri)
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for c, r in self.metadata_filter_rules():
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ri.iptables_manager.ipv4['filter'].add_rule(c, r)
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for c, r in self.metadata_nat_rules():
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ri.iptables_manager.ipv4['nat'].add_rule(c, r)
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ri.iptables_manager.apply()
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self._spawn_metadata_proxy(ri)
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def _router_removed(self, router_id):
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ri = self.router_info[router_id]
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for c, r in self.metadata_filter_rules():
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ri.iptables_manager.ipv4['filter'].remove_rule(c, r)
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for c, r in self.metadata_nat_rules():
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ri.iptables_manager.ipv4['nat'].remove_rule(c, r)
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ri.iptables_manager.apply()
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self._destroy_metadata_proxy(ri)
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del self.router_info[router_id]
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self._destroy_router_namespace(ri.ns_name())
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def _spawn_metadata_proxy(self, router_info):
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def callback(pid_file):
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return ['quantum-ns-metadata-proxy',
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'--pid_file=%s' % pid_file,
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'--router_id=%s' % router_info.router_id,
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'--state_path=%s' % self.conf.state_path]
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pm = external_process.ProcessManager(
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self.conf,
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router_info.router_id,
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self.root_helper,
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router_info.ns_name())
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pm.enable(callback)
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def _destroy_metadata_proxy(self, router_info):
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pm = external_process.ProcessManager(
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self.conf,
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router_info.router_id,
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self.root_helper,
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router_info.ns_name())
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pm.disable()
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def _set_subnet_info(self, port):
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ips = port['fixed_ips']
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if not ips:
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raise Exception(_("Router port %s has no IP address") % port['id'])
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if len(ips) > 1:
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LOG.error(_("Ignoring multiple IPs on router port %s"),
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port['id'])
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prefixlen = netaddr.IPNetwork(port['subnet']['cidr']).prefixlen
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port['ip_cidr'] = "%s/%s" % (ips[0]['ip_address'], prefixlen)
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def process_router(self, ri):
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ex_gw_port = self._get_ex_gw_port(ri)
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internal_ports = ri.router.get(l3_constants.INTERFACE_KEY, [])
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existing_port_ids = set([p['id'] for p in ri.internal_ports])
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current_port_ids = set([p['id'] for p in internal_ports
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if p['admin_state_up']])
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new_ports = [p for p in internal_ports if
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p['id'] in current_port_ids and
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p['id'] not in existing_port_ids]
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old_ports = [p for p in ri.internal_ports if
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p['id'] not in current_port_ids]
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for p in new_ports:
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self._set_subnet_info(p)
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ri.internal_ports.append(p)
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self.internal_network_added(ri, ex_gw_port,
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p['network_id'], p['id'],
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p['ip_cidr'], p['mac_address'])
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for p in old_ports:
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ri.internal_ports.remove(p)
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self.internal_network_removed(ri, ex_gw_port, p['id'],
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p['ip_cidr'])
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internal_cidrs = [p['ip_cidr'] for p in ri.internal_ports]
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if ex_gw_port and not ri.ex_gw_port:
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self._set_subnet_info(ex_gw_port)
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self.external_gateway_added(ri, ex_gw_port, internal_cidrs)
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elif not ex_gw_port and ri.ex_gw_port:
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self.external_gateway_removed(ri, ri.ex_gw_port,
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internal_cidrs)
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if ri.ex_gw_port or ex_gw_port:
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self.process_router_floating_ips(ri, ex_gw_port)
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ri.ex_gw_port = ex_gw_port
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def process_router_floating_ips(self, ri, ex_gw_port):
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floating_ips = ri.router.get(l3_constants.FLOATINGIP_KEY, [])
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existing_floating_ip_ids = set([fip['id'] for fip in ri.floating_ips])
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cur_floating_ip_ids = set([fip['id'] for fip in floating_ips])
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id_to_fip_map = {}
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for fip in floating_ips:
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if fip['port_id']:
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if fip['id'] not in existing_floating_ip_ids:
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ri.floating_ips.append(fip)
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self.floating_ip_added(ri, ex_gw_port,
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fip['floating_ip_address'],
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fip['fixed_ip_address'])
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# store to see if floatingip was remapped
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id_to_fip_map[fip['id']] = fip
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floating_ip_ids_to_remove = (existing_floating_ip_ids -
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cur_floating_ip_ids)
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for fip in ri.floating_ips:
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if fip['id'] in floating_ip_ids_to_remove:
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ri.floating_ips.remove(fip)
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self.floating_ip_removed(ri, ri.ex_gw_port,
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fip['floating_ip_address'],
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fip['fixed_ip_address'])
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else:
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# handle remapping of a floating IP
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new_fip = id_to_fip_map[fip['id']]
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new_fixed_ip = new_fip['fixed_ip_address']
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existing_fixed_ip = fip['fixed_ip_address']
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if (new_fixed_ip and existing_fixed_ip and
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new_fixed_ip != existing_fixed_ip):
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floating_ip = fip['floating_ip_address']
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self.floating_ip_removed(ri, ri.ex_gw_port,
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floating_ip, existing_fixed_ip)
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self.floating_ip_added(ri, ri.ex_gw_port,
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floating_ip, new_fixed_ip)
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ri.floating_ips.remove(fip)
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ri.floating_ips.append(new_fip)
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def _get_ex_gw_port(self, ri):
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return ri.router.get('gw_port')
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def _send_gratuitous_arp_packet(self, ri, interface_name, ip_address):
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if self.conf.send_arp_for_ha > 0:
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arping_cmd = ['arping', '-A', '-U',
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'-I', interface_name,
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'-c', self.conf.send_arp_for_ha,
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ip_address]
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try:
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if self.conf.use_namespaces:
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ip_wrapper = ip_lib.IPWrapper(self.root_helper,
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namespace=ri.ns_name())
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ip_wrapper.netns.execute(arping_cmd, check_exit_code=True)
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else:
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utils.execute(arping_cmd, check_exit_code=True,
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root_helper=self.root_helper)
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except Exception as e:
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LOG.error(_("Failed sending gratuitous ARP: %s"), str(e))
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def get_internal_device_name(self, port_id):
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return (INTERNAL_DEV_PREFIX + port_id)[:self.driver.DEV_NAME_LEN]
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def get_external_device_name(self, port_id):
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return (EXTERNAL_DEV_PREFIX + port_id)[:self.driver.DEV_NAME_LEN]
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def external_gateway_added(self, ri, ex_gw_port, internal_cidrs):
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interface_name = self.get_external_device_name(ex_gw_port['id'])
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ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address']
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if not ip_lib.device_exists(interface_name,
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root_helper=self.root_helper,
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namespace=ri.ns_name()):
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self.driver.plug(ex_gw_port['network_id'],
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ex_gw_port['id'], interface_name,
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ex_gw_port['mac_address'],
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bridge=self.conf.external_network_bridge,
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namespace=ri.ns_name(),
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prefix=EXTERNAL_DEV_PREFIX)
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self.driver.init_l3(interface_name, [ex_gw_port['ip_cidr']],
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namespace=ri.ns_name())
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ip_address = ex_gw_port['ip_cidr'].split('/')[0]
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self._send_gratuitous_arp_packet(ri, interface_name, ip_address)
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gw_ip = ex_gw_port['subnet']['gateway_ip']
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if ex_gw_port['subnet']['gateway_ip']:
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cmd = ['route', 'add', 'default', 'gw', gw_ip]
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if self.conf.use_namespaces:
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ip_wrapper = ip_lib.IPWrapper(self.root_helper,
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namespace=ri.ns_name())
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ip_wrapper.netns.execute(cmd, check_exit_code=False)
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else:
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utils.execute(cmd, check_exit_code=False,
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root_helper=self.root_helper)
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for (c, r) in self.external_gateway_nat_rules(ex_gw_ip,
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internal_cidrs,
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interface_name):
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ri.iptables_manager.ipv4['nat'].add_rule(c, r)
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ri.iptables_manager.apply()
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def external_gateway_removed(self, ri, ex_gw_port, internal_cidrs):
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interface_name = self.get_external_device_name(ex_gw_port['id'])
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if ip_lib.device_exists(interface_name,
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root_helper=self.root_helper,
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namespace=ri.ns_name()):
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self.driver.unplug(interface_name,
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bridge=self.conf.external_network_bridge,
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namespace=ri.ns_name(),
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prefix=EXTERNAL_DEV_PREFIX)
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ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address']
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for c, r in self.external_gateway_nat_rules(ex_gw_ip, internal_cidrs,
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interface_name):
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ri.iptables_manager.ipv4['nat'].remove_rule(c, r)
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ri.iptables_manager.apply()
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def metadata_filter_rules(self):
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rules = []
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rules.append(('INPUT', '-s 0.0.0.0/0 -d 127.0.0.1 '
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'-p tcp -m tcp --dport %s '
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'-j ACCEPT' % self.conf.metadata_port))
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return rules
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def metadata_nat_rules(self):
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rules = []
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rules.append(('PREROUTING', '-s 0.0.0.0/0 -d 169.254.169.254/32 '
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|
'-p tcp -m tcp --dport 80 -j REDIRECT '
|
|
'--to-port %s' % self.conf.metadata_port))
|
|
return rules
|
|
|
|
def external_gateway_nat_rules(self, ex_gw_ip, internal_cidrs,
|
|
interface_name):
|
|
rules = [('POSTROUTING', '! -i %(interface_name)s '
|
|
'! -o %(interface_name)s -m conntrack ! '
|
|
'--ctstate DNAT -j ACCEPT' % locals())]
|
|
for cidr in internal_cidrs:
|
|
rules.extend(self.internal_network_nat_rules(ex_gw_ip, cidr))
|
|
return rules
|
|
|
|
def internal_network_added(self, ri, ex_gw_port, network_id, port_id,
|
|
internal_cidr, mac_address):
|
|
interface_name = self.get_internal_device_name(port_id)
|
|
if not ip_lib.device_exists(interface_name,
|
|
root_helper=self.root_helper,
|
|
namespace=ri.ns_name()):
|
|
self.driver.plug(network_id, port_id, interface_name, mac_address,
|
|
namespace=ri.ns_name(),
|
|
prefix=INTERNAL_DEV_PREFIX)
|
|
|
|
self.driver.init_l3(interface_name, [internal_cidr],
|
|
namespace=ri.ns_name())
|
|
ip_address = internal_cidr.split('/')[0]
|
|
self._send_gratuitous_arp_packet(ri, interface_name, ip_address)
|
|
|
|
if ex_gw_port:
|
|
ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address']
|
|
for c, r in self.internal_network_nat_rules(ex_gw_ip,
|
|
internal_cidr):
|
|
ri.iptables_manager.ipv4['nat'].add_rule(c, r)
|
|
ri.iptables_manager.apply()
|
|
|
|
def internal_network_removed(self, ri, ex_gw_port, port_id, internal_cidr):
|
|
interface_name = self.get_internal_device_name(port_id)
|
|
if ip_lib.device_exists(interface_name,
|
|
root_helper=self.root_helper,
|
|
namespace=ri.ns_name()):
|
|
self.driver.unplug(interface_name, namespace=ri.ns_name(),
|
|
prefix=INTERNAL_DEV_PREFIX)
|
|
|
|
if ex_gw_port:
|
|
ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address']
|
|
for c, r in self.internal_network_nat_rules(ex_gw_ip,
|
|
internal_cidr):
|
|
ri.iptables_manager.ipv4['nat'].remove_rule(c, r)
|
|
ri.iptables_manager.apply()
|
|
|
|
def internal_network_nat_rules(self, ex_gw_ip, internal_cidr):
|
|
rules = [('snat', '-s %s -j SNAT --to-source %s' %
|
|
(internal_cidr, ex_gw_ip))]
|
|
return rules
|
|
|
|
def floating_ip_added(self, ri, ex_gw_port, floating_ip, fixed_ip):
|
|
ip_cidr = str(floating_ip) + '/32'
|
|
interface_name = self.get_external_device_name(ex_gw_port['id'])
|
|
device = ip_lib.IPDevice(interface_name, self.root_helper,
|
|
namespace=ri.ns_name())
|
|
|
|
if ip_cidr not in [addr['cidr'] for addr in device.addr.list()]:
|
|
net = netaddr.IPNetwork(ip_cidr)
|
|
device.addr.add(net.version, ip_cidr, str(net.broadcast))
|
|
self._send_gratuitous_arp_packet(ri, interface_name, floating_ip)
|
|
|
|
for chain, rule in self.floating_forward_rules(floating_ip, fixed_ip):
|
|
ri.iptables_manager.ipv4['nat'].add_rule(chain, rule)
|
|
ri.iptables_manager.apply()
|
|
|
|
def floating_ip_removed(self, ri, ex_gw_port, floating_ip, fixed_ip):
|
|
ip_cidr = str(floating_ip) + '/32'
|
|
net = netaddr.IPNetwork(ip_cidr)
|
|
interface_name = self.get_external_device_name(ex_gw_port['id'])
|
|
|
|
device = ip_lib.IPDevice(interface_name, self.root_helper,
|
|
namespace=ri.ns_name())
|
|
device.addr.delete(net.version, ip_cidr)
|
|
|
|
for chain, rule in self.floating_forward_rules(floating_ip, fixed_ip):
|
|
ri.iptables_manager.ipv4['nat'].remove_rule(chain, rule)
|
|
ri.iptables_manager.apply()
|
|
|
|
def floating_forward_rules(self, floating_ip, fixed_ip):
|
|
return [('PREROUTING', '-d %s -j DNAT --to %s' %
|
|
(floating_ip, fixed_ip)),
|
|
('OUTPUT', '-d %s -j DNAT --to %s' %
|
|
(floating_ip, fixed_ip)),
|
|
('float-snat', '-s %s -j SNAT --to %s' %
|
|
(fixed_ip, floating_ip))]
|
|
|
|
def router_deleted(self, context, router_id):
|
|
"""Deal with router deletion RPC message."""
|
|
with self.sync_sem:
|
|
if router_id in self.router_info:
|
|
try:
|
|
self._router_removed(router_id)
|
|
except Exception:
|
|
msg = _("Failed dealing with router "
|
|
"'%s' deletion RPC message")
|
|
LOG.debug(msg, router_id)
|
|
self.fullsync = True
|
|
|
|
def routers_updated(self, context, routers):
|
|
"""Deal with routers modification and creation RPC message."""
|
|
if not routers:
|
|
return
|
|
with self.sync_sem:
|
|
try:
|
|
self._process_routers(routers)
|
|
except Exception:
|
|
msg = _("Failed dealing with routers update RPC message")
|
|
LOG.debug(msg)
|
|
self.fullsync = True
|
|
|
|
def _process_routers(self, routers):
|
|
if (self.conf.external_network_bridge and
|
|
not ip_lib.device_exists(self.conf.external_network_bridge)):
|
|
LOG.error(_("The external network bridge '%s' does not exist"),
|
|
self.conf.external_network_bridge)
|
|
return
|
|
|
|
target_ex_net_id = self._fetch_external_net_id()
|
|
|
|
for r in routers:
|
|
if not r['admin_state_up']:
|
|
continue
|
|
|
|
# If namespaces are disabled, only process the router associated
|
|
# with the configured agent id.
|
|
if (not self.conf.use_namespaces and
|
|
r['id'] != self.conf.router_id):
|
|
continue
|
|
|
|
ex_net_id = (r['external_gateway_info'] or {}).get('network_id')
|
|
if not ex_net_id and not self.conf.handle_internal_only_routers:
|
|
continue
|
|
|
|
if ex_net_id and ex_net_id != target_ex_net_id:
|
|
continue
|
|
|
|
if r['id'] not in self.router_info:
|
|
self._router_added(r['id'])
|
|
|
|
ri = self.router_info[r['id']]
|
|
ri.router = r
|
|
self.process_router(ri)
|
|
|
|
@periodic_task.periodic_task
|
|
def _sync_routers_task(self, context):
|
|
# we need to sync with router deletion RPC message
|
|
with self.sync_sem:
|
|
if self.fullsync:
|
|
try:
|
|
if not self.conf.use_namespaces:
|
|
router_id = self.conf.router_id
|
|
else:
|
|
router_id = None
|
|
routers = self.plugin_rpc.get_routers(
|
|
context, router_id)
|
|
self.router_info = {}
|
|
self._process_routers(routers)
|
|
self.fullsync = False
|
|
except Exception:
|
|
LOG.exception(_("Failed synchronizing routers"))
|
|
self.fullsync = True
|
|
|
|
def after_start(self):
|
|
LOG.info(_("L3 agent started"))
|
|
|
|
|
|
def main():
|
|
eventlet.monkey_patch()
|
|
conf = cfg.CONF
|
|
conf.register_opts(L3NATAgent.OPTS)
|
|
config.register_root_helper(conf)
|
|
conf.register_opts(interface.OPTS)
|
|
conf.register_opts(external_process.OPTS)
|
|
conf()
|
|
config.setup_logging(conf)
|
|
server = quantum_service.Service.create(binary='quantum-l3-agent',
|
|
topic=topics.L3_AGENT)
|
|
service.launch(server).wait()
|