552 lines
20 KiB
Python
552 lines
20 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 OpenStack LLC
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# 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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import os
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import socket
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import uuid
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import eventlet
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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 dhcp
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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 import rpc as agent_rpc
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from quantum.common import exceptions
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from quantum.common import topics
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from quantum import context
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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 jsonutils
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from quantum.openstack.common import log as logging
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from quantum.openstack.common.rpc import proxy
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from quantum.openstack.common import uuidutils
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LOG = logging.getLogger(__name__)
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NS_PREFIX = 'qdhcp-'
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class DhcpAgent(object):
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OPTS = [
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cfg.StrOpt('root_helper', default='sudo'),
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cfg.IntOpt('resync_interval', default=30),
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cfg.StrOpt('dhcp_driver',
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default='quantum.agent.linux.dhcp.Dnsmasq',
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help=_("The driver used to manage the DHCP server.")),
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cfg.BoolOpt('use_namespaces', default=True,
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help=_("Allow overlapping IP."))
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]
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def __init__(self, conf):
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self.needs_resync = False
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self.conf = conf
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self.cache = NetworkCache()
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self.dhcp_driver_cls = importutils.import_class(conf.dhcp_driver)
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ctx = context.get_admin_context_without_session()
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self.plugin_rpc = DhcpPluginApi(topics.PLUGIN, ctx)
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self.device_manager = DeviceManager(self.conf, self.plugin_rpc)
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self.notifications = agent_rpc.NotificationDispatcher()
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self.lease_relay = DhcpLeaseRelay(self.update_lease)
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def run(self):
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"""Activate the DHCP agent."""
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self.sync_state()
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self.periodic_resync()
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self.lease_relay.start()
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self.notifications.run_dispatch(self)
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def call_driver(self, action, network):
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"""Invoke an action on a DHCP driver instance."""
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if self.conf.use_namespaces:
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namespace = NS_PREFIX + network.id
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else:
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namespace = None
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try:
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# the Driver expects something that is duck typed similar to
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# the base models.
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driver = self.dhcp_driver_cls(self.conf,
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network,
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self.conf.root_helper,
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self.device_manager,
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namespace)
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getattr(driver, action)()
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return True
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except Exception, e:
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self.needs_resync = True
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LOG.exception(_('Unable to %s dhcp.'), action)
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def update_lease(self, network_id, ip_address, time_remaining):
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try:
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self.plugin_rpc.update_lease_expiration(network_id, ip_address,
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time_remaining)
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except:
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self.needs_resync = True
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LOG.exception(_('Unable to update lease'))
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def sync_state(self):
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"""Sync the local DHCP state with Quantum."""
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LOG.info(_('Synchronizing state'))
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known_networks = set(self.cache.get_network_ids())
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try:
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active_networks = set(self.plugin_rpc.get_active_networks())
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for deleted_id in known_networks - active_networks:
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self.disable_dhcp_helper(deleted_id)
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for network_id in active_networks:
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self.refresh_dhcp_helper(network_id)
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except:
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self.needs_resync = True
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LOG.exception(_('Unable to sync network state.'))
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def _periodic_resync_helper(self):
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"""Resync the dhcp state at the configured interval."""
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while True:
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eventlet.sleep(self.conf.resync_interval)
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if self.needs_resync:
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self.needs_resync = False
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self.sync_state()
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def periodic_resync(self):
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"""Spawn a thread to periodically resync the dhcp state."""
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eventlet.spawn(self._periodic_resync_helper)
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def enable_dhcp_helper(self, network_id):
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"""Enable DHCP for a network that meets enabling criteria."""
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try:
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network = self.plugin_rpc.get_network_info(network_id)
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except:
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self.needs_resync = True
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LOG.exception(_('Network %s RPC info call failed.'), network_id)
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return
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if not network.admin_state_up:
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return
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for subnet in network.subnets:
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if subnet.enable_dhcp:
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if self.call_driver('enable', network):
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self.cache.put(network)
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break
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def disable_dhcp_helper(self, network_id):
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"""Disable DHCP for a network known to the agent."""
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network = self.cache.get_network_by_id(network_id)
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if network:
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if self.call_driver('disable', network):
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self.cache.remove(network)
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def refresh_dhcp_helper(self, network_id):
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"""Refresh or disable DHCP for a network depending on the current state
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of the network.
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"""
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old_network = self.cache.get_network_by_id(network_id)
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if not old_network:
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# DHCP current not running for network.
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return self.enable_dhcp_helper(network_id)
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try:
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network = self.plugin_rpc.get_network_info(network_id)
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except:
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self.needs_resync = True
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LOG.exception(_('Network %s RPC info call failed.'), network_id)
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return
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old_cidrs = set(s.cidr for s in old_network.subnets if s.enable_dhcp)
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new_cidrs = set(s.cidr for s in network.subnets if s.enable_dhcp)
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if new_cidrs and old_cidrs == new_cidrs:
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self.call_driver('reload_allocations', network)
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self.cache.put(network)
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elif new_cidrs:
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if self.call_driver('restart', network):
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self.cache.put(network)
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else:
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self.disable_dhcp_helper(network.id)
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def network_create_end(self, payload):
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"""Handle the network.create.end notification event."""
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network_id = payload['network']['id']
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self.enable_dhcp_helper(network_id)
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def network_update_end(self, payload):
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"""Handle the network.update.end notification event."""
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network_id = payload['network']['id']
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if payload['network']['admin_state_up']:
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self.enable_dhcp_helper(network_id)
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else:
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self.disable_dhcp_helper(network_id)
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def network_delete_end(self, payload):
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"""Handle the network.delete.end notification event."""
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self.disable_dhcp_helper(payload['network_id'])
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def subnet_update_end(self, payload):
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"""Handle the subnet.update.end notification event."""
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network_id = payload['subnet']['network_id']
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self.refresh_dhcp_helper(network_id)
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# Use the update handler for the subnet create event.
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subnet_create_end = subnet_update_end
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def subnet_delete_end(self, payload):
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"""Handle the subnet.delete.end notification event."""
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subnet_id = payload['subnet_id']
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network = self.cache.get_network_by_subnet_id(subnet_id)
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if network:
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self.refresh_dhcp_helper(network.id)
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def port_update_end(self, payload):
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"""Handle the port.update.end notification event."""
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port = DictModel(payload['port'])
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network = self.cache.get_network_by_id(port.network_id)
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if network:
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self.cache.put_port(port)
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self.call_driver('reload_allocations', network)
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# Use the update handler for the port create event.
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port_create_end = port_update_end
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def port_delete_end(self, payload):
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"""Handle the port.delete.end notification event."""
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port = self.cache.get_port_by_id(payload['port_id'])
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if port:
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network = self.cache.get_network_by_id(port.network_id)
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self.cache.remove_port(port)
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self.call_driver('reload_allocations', network)
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class DhcpPluginApi(proxy.RpcProxy):
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"""Agent side of the dhcp 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, context):
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super(DhcpPluginApi, self).__init__(
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topic=topic, default_version=self.BASE_RPC_API_VERSION)
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self.context = context
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self.host = socket.gethostname()
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def get_active_networks(self):
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"""Make a remote process call to retrieve the active networks."""
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return self.call(self.context,
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self.make_msg('get_active_networks', host=self.host),
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topic=self.topic)
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def get_network_info(self, network_id):
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"""Make a remote process call to retrieve network info."""
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return DictModel(self.call(self.context,
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self.make_msg('get_network_info',
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network_id=network_id,
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host=self.host),
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topic=self.topic))
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def get_dhcp_port(self, network_id, device_id):
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"""Make a remote process call to create the dhcp port."""
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return DictModel(self.call(self.context,
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self.make_msg('get_dhcp_port',
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network_id=network_id,
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device_id=device_id,
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host=self.host),
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topic=self.topic))
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def release_dhcp_port(self, network_id, device_id):
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"""Make a remote process call to release the dhcp port."""
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return self.call(self.context,
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self.make_msg('release_dhcp_port',
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network_id=network_id,
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device_id=device_id,
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host=self.host),
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topic=self.topic)
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def release_port_fixed_ip(self, network_id, device_id, subnet_id):
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"""Make a remote process call to release a fixed_ip on the port."""
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return self.call(self.context,
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self.make_msg('release_port_fixed_ip',
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network_id=network_id,
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subnet_id=subnet_id,
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device_id=device_id,
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host=self.host),
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topic=self.topic)
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def update_lease_expiration(self, network_id, ip_address, lease_remaining):
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"""Make a remote process call to update the ip lease expiration."""
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self.cast(self.context,
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self.make_msg('update_lease_expiration',
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network_id=network_id,
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ip_address=ip_address,
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lease_remaining=lease_remaining,
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host=self.host),
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topic=self.topic)
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class NetworkCache(object):
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"""Agent cache of the current network state."""
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def __init__(self):
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self.cache = {}
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self.subnet_lookup = {}
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self.port_lookup = {}
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def get_network_ids(self):
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return self.cache.keys()
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def get_network_by_id(self, network_id):
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return self.cache.get(network_id)
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def get_network_by_subnet_id(self, subnet_id):
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return self.cache.get(self.subnet_lookup.get(subnet_id))
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def get_network_by_port_id(self, port_id):
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return self.cache.get(self.port_lookup.get(port_id))
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def put(self, network):
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if network.id in self.cache:
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self.remove(self.cache[network.id])
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self.cache[network.id] = network
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for subnet in network.subnets:
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self.subnet_lookup[subnet.id] = network.id
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for port in network.ports:
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self.port_lookup[port.id] = network.id
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def remove(self, network):
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del self.cache[network.id]
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for subnet in network.subnets:
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del self.subnet_lookup[subnet.id]
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for port in network.ports:
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del self.port_lookup[port.id]
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def put_port(self, port):
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network = self.get_network_by_id(port.network_id)
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for index in range(len(network.ports)):
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if network.ports[index].id == port.id:
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network.ports[index] = port
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break
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else:
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network.ports.append(port)
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self.port_lookup[port.id] = network.id
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def remove_port(self, port):
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network = self.get_network_by_port_id(port.id)
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for index in range(len(network.ports)):
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if network.ports[index] == port:
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del network.ports[index]
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del self.port_lookup[port.id]
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break
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def get_port_by_id(self, port_id):
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network = self.get_network_by_port_id(port_id)
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if network:
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for port in network.ports:
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if port.id == port_id:
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return port
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class DeviceManager(object):
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OPTS = [
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cfg.StrOpt('admin_user'),
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cfg.StrOpt('admin_password'),
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cfg.StrOpt('admin_tenant_name'),
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cfg.StrOpt('auth_url'),
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cfg.StrOpt('auth_strategy', default='keystone',
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help=_("The type of authentication to use")),
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cfg.StrOpt('auth_region'),
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cfg.StrOpt('interface_driver',
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help=_("The driver used to manage the virtual interface."))
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]
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def __init__(self, conf, plugin):
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self.conf = conf
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self.plugin = plugin
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if not conf.interface_driver:
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LOG.error(_('You must specify an interface driver'))
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self.driver = importutils.import_object(conf.interface_driver, conf)
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def get_interface_name(self, network, port=None):
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"""Return interface(device) name for use by the DHCP process."""
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if not port:
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device_id = self.get_device_id(network)
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port = self.plugin.get_dhcp_port(network.id, device_id)
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return self.driver.get_device_name(port)
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def get_device_id(self, network):
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"""Return a unique DHCP device ID for this host on the network."""
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# There could be more than one dhcp server per network, so create
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# a device id that combines host and network ids
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host_uuid = uuid.uuid5(uuid.NAMESPACE_DNS, socket.gethostname())
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return 'dhcp%s-%s' % (host_uuid, network.id)
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def setup(self, network, reuse_existing=False):
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"""Create and initialize a device for network's DHCP on this host."""
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device_id = self.get_device_id(network)
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port = self.plugin.get_dhcp_port(network.id, device_id)
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interface_name = self.get_interface_name(network, port)
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if self.conf.use_namespaces:
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namespace = NS_PREFIX + network.id
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else:
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namespace = None
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if ip_lib.device_exists(interface_name,
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self.conf.root_helper,
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namespace):
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if not reuse_existing:
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raise exceptions.PreexistingDeviceFailure(
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dev_name=interface_name)
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LOG.debug(_('Reusing existing device: %s.'), interface_name)
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else:
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self.driver.plug(network.id,
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port.id,
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interface_name,
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port.mac_address,
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namespace=namespace)
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ip_cidrs = []
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for fixed_ip in port.fixed_ips:
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subnet = fixed_ip.subnet
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net = netaddr.IPNetwork(subnet.cidr)
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ip_cidr = '%s/%s' % (fixed_ip.ip_address, net.prefixlen)
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ip_cidrs.append(ip_cidr)
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self.driver.init_l3(interface_name, ip_cidrs,
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namespace=namespace)
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# ensure that the dhcp interface is first in the list
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if namespace is None:
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device = ip_lib.IPDevice(interface_name, self.conf.root_helper)
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device.route.pullup_route(interface_name)
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return interface_name
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def destroy(self, network, device_name):
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"""Destroy the device used for the network's DHCP on this host."""
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if self.conf.use_namespaces:
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namespace = NS_PREFIX + network.id
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else:
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namespace = None
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self.driver.unplug(device_name, namespace=namespace)
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self.plugin.release_dhcp_port(network.id,
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self.get_device_id(network))
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class DictModel(object):
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"""Convert dict into an object that provides attribute access to values."""
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def __init__(self, d):
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for key, value in d.iteritems():
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if isinstance(value, list):
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value = [DictModel(item) if isinstance(item, dict) else item
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for item in value]
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elif isinstance(value, dict):
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value = DictModel(value)
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setattr(self, key, value)
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class DhcpLeaseRelay(object):
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"""UNIX domain socket server for processing lease updates.
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Network namespace isolation prevents the DHCP process from notifying
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Quantum directly. This class works around the limitation by using the
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domain socket to pass the information. This class handles message.
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receiving and then calls the callback method.
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"""
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OPTS = [
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cfg.StrOpt('dhcp_lease_relay_socket',
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default='$state_path/dhcp/lease_relay',
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help=_('Location to DHCP lease relay UNIX domain socket'))
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]
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def __init__(self, lease_update_callback):
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self.callback = lease_update_callback
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dirname = os.path.dirname(cfg.CONF.dhcp_lease_relay_socket)
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if os.path.isdir(dirname):
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try:
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os.unlink(cfg.CONF.dhcp_lease_relay_socket)
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except OSError:
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if os.path.exists(cfg.CONF.dhcp_lease_relay_socket):
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raise
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else:
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os.makedirs(dirname, 0755)
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def _handler(self, client_sock, client_addr):
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"""Handle incoming lease relay stream connection.
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This method will only read the first 1024 bytes and then close the
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connection. The limit exists to limit the impact of misbehaving
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clients.
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"""
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|
try:
|
|
msg = client_sock.recv(1024)
|
|
data = jsonutils.loads(msg)
|
|
client_sock.close()
|
|
|
|
network_id = data['network_id']
|
|
if not uuidutils.is_uuid_like(network_id):
|
|
raise ValueError(_("Network ID %s is not a valid UUID") %
|
|
network_id)
|
|
ip_address = str(netaddr.IPAddress(data['ip_address']))
|
|
lease_remaining = int(data['lease_remaining'])
|
|
self.callback(network_id, ip_address, lease_remaining)
|
|
except ValueError, e:
|
|
LOG.warn(_('Unable to parse lease relay msg to dict.'))
|
|
LOG.warn(_('Exception value: %s'), e)
|
|
LOG.warn(_('Message representation: %s'), repr(msg))
|
|
except Exception, e:
|
|
LOG.exception(_('Unable update lease. Exception'))
|
|
|
|
def start(self):
|
|
"""Spawn a green thread to run the lease relay unix socket server."""
|
|
listener = eventlet.listen(cfg.CONF.dhcp_lease_relay_socket,
|
|
family=socket.AF_UNIX)
|
|
eventlet.spawn(eventlet.serve, listener, self._handler)
|
|
|
|
|
|
def main():
|
|
eventlet.monkey_patch()
|
|
cfg.CONF.register_opts(DhcpAgent.OPTS)
|
|
cfg.CONF.register_opts(DeviceManager.OPTS)
|
|
cfg.CONF.register_opts(DhcpLeaseRelay.OPTS)
|
|
cfg.CONF.register_opts(dhcp.OPTS)
|
|
cfg.CONF.register_opts(interface.OPTS)
|
|
cfg.CONF(project='quantum')
|
|
config.setup_logging(cfg.CONF)
|
|
|
|
mgr = DhcpAgent(cfg.CONF)
|
|
mgr.run()
|