x/vmware-nsx
Code Issues Proposed changes
5ae3e72c1f
vmware-nsx/neutron/agent/l3_agent.py
Salvatore Orlando 8f0943a550 Configure floating IPs addresses after NAT rules 
Change the behaviour of the L3 agent in order to set the IP addresses
for the floating IPs on the external gateway interface after the
relevant NAT rules have been applied.
This will avoid a transitory period in which the floating IP exists
and is reachable but it not yet wired to the actual target.

Partial-Bug: #1265505

Change-Id: Ib382fde021868bab2185f2fa5bdee86559148ba7
2014-02-05 12:49:02 -05:00

895 lines
38 KiB
Python
Raw Blame History

# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# Copyright 2012 Nicira Networks, 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.
#
# @author: Dan Wendlandt, Nicira, Inc
#
import eventlet
import netaddr
from oslo.config import cfg
from neutron.agent.common import config
from neutron.agent.linux import external_process
from neutron.agent.linux import interface
from neutron.agent.linux import ip_lib
from neutron.agent.linux import iptables_manager
from neutron.agent.linux import ovs_lib # noqa
from neutron.agent.linux import utils
from neutron.agent import rpc as agent_rpc
from neutron.common import constants as l3_constants
from neutron.common import legacy
from neutron.common import topics
from neutron.common import utils as common_utils
from neutron import context
from neutron import manager
from neutron.openstack.common import importutils
from neutron.openstack.common import lockutils
from neutron.openstack.common import log as logging
from neutron.openstack.common import loopingcall
from neutron.openstack.common import periodic_task
from neutron.openstack.common.rpc import common as rpc_common
from neutron.openstack.common.rpc import proxy
from neutron.openstack.common import service
from neutron import service as neutron_service
from neutron.services.firewall.agents.l3reference import firewall_l3_agent
LOG = logging.getLogger(__name__)
NS_PREFIX = 'qrouter-'
INTERNAL_DEV_PREFIX = 'qr-'
EXTERNAL_DEV_PREFIX = 'qg-'
RPC_LOOP_INTERVAL = 1
FLOATING_IP_CIDR_SUFFIX = '/32'
class L3PluginApi(proxy.RpcProxy):
"""Agent side of the l3 agent RPC API.
API version history:
1.0 - Initial version.
"""
BASE_RPC_API_VERSION = '1.0'
def __init__(self, topic, host):
super(L3PluginApi, self).__init__(
topic=topic, default_version=self.BASE_RPC_API_VERSION)
self.host = host
def get_routers(self, context, router_ids=None):
"""Make a remote process call to retrieve the sync data for routers."""
return self.call(context,
self.make_msg('sync_routers', host=self.host,
router_ids=router_ids),
topic=self.topic)
def get_external_network_id(self, context):
"""Make a remote process call to retrieve the external network id.
@raise common.RemoteError: with TooManyExternalNetworks
as exc_type if there are
more than one external network
"""
return self.call(context,
self.make_msg('get_external_network_id',
host=self.host),
topic=self.topic)
class RouterInfo(object):
def __init__(self, router_id, root_helper, use_namespaces, router):
self.router_id = router_id
self.ex_gw_port = None
self._snat_enabled = None
self._snat_action = None
self.internal_ports = []
self.root_helper = root_helper
self.use_namespaces = use_namespaces
# Invoke the setter for establishing initial SNAT action
self.router = router
self.iptables_manager = iptables_manager.IptablesManager(
root_helper=root_helper,
#FIXME(danwent): use_ipv6=True,
namespace=self.ns_name())
self.routes = []
@property
def router(self):
return self._router
@router.setter
def router(self, value):
self._router = value
if not self._router:
return
# enable_snat by default if it wasn't specified by plugin
self._snat_enabled = self._router.get('enable_snat', True)
# Set a SNAT action for the router
if self._router.get('gw_port'):
self._snat_action = ('add_rules' if self._snat_enabled
else 'remove_rules')
elif self.ex_gw_port:
# Gateway port was removed, remove rules
self._snat_action = 'remove_rules'
def ns_name(self):
if self.use_namespaces:
return NS_PREFIX + self.router_id
def perform_snat_action(self, snat_callback, *args):
# Process SNAT rules for attached subnets
if self._snat_action:
snat_callback(self, self._router.get('gw_port'),
*args, action=self._snat_action)
self._snat_action = None
class L3NATAgent(firewall_l3_agent.FWaaSL3AgentRpcCallback, manager.Manager):
"""Manager for L3NatAgent
API version history:
1.0 initial Version
1.1 changed the type of the routers parameter
to the routers_updated method.
It was previously a list of routers in dict format.
It is now a list of router IDs only.
Per rpc versioning rules, it is backwards compatible.
"""
RPC_API_VERSION = '1.1'
OPTS = [
cfg.StrOpt('external_network_bridge', default='br-ex',
help=_("Name of bridge used for external network "
"traffic.")),
cfg.StrOpt('interface_driver',
help=_("The driver used to manage the virtual "
"interface.")),
cfg.IntOpt('metadata_port',
default=9697,
help=_("TCP Port used by Neutron metadata namespace "
"proxy.")),
cfg.IntOpt('send_arp_for_ha',
default=0,
help=_("Send this many gratuitous ARPs for HA setup, if "
"less than or equal to 0, the feature is disabled")),
cfg.BoolOpt('use_namespaces', default=True,
help=_("Allow overlapping IP.")),
cfg.StrOpt('router_id', default='',
help=_("If namespaces is disabled, the l3 agent can only"
" configure a router that has the matching router "
"ID.")),
cfg.BoolOpt('handle_internal_only_routers',
default=True,
help=_("Agent should implement routers with no gateway")),
cfg.StrOpt('gateway_external_network_id', default='',
help=_("UUID of external network for routers implemented "
"by the agents.")),
cfg.BoolOpt('enable_metadata_proxy', default=True,
help=_("Allow running metadata proxy.")),
cfg.BoolOpt('router_delete_namespaces', default=False,
help=_("Delete namespace after removing a router.")),
cfg.StrOpt('metadata_proxy_socket',
default='$state_path/metadata_proxy',
help=_('Location of Metadata Proxy UNIX domain '
'socket')),
]
def __init__(self, host, conf=None):
if conf:
self.conf = conf
else:
self.conf = cfg.CONF
self.root_helper = config.get_root_helper(self.conf)
self.router_info = {}
self._check_config_params()
try:
self.driver = importutils.import_object(
self.conf.interface_driver,
self.conf
)
except Exception:
msg = _("Error importing interface driver "
"'%s'") % self.conf.interface_driver
LOG.error(msg)
raise SystemExit(msg)
self.context = context.get_admin_context_without_session()
self.plugin_rpc = L3PluginApi(topics.L3PLUGIN, host)
self.fullsync = True
self.updated_routers = set()
self.removed_routers = set()
self.sync_progress = False
if self.conf.use_namespaces:
self._destroy_router_namespaces(self.conf.router_id)
self.rpc_loop = loopingcall.FixedIntervalLoopingCall(
self._rpc_loop)
self.rpc_loop.start(interval=RPC_LOOP_INTERVAL)
super(L3NATAgent, self).__init__(conf=self.conf)
def _check_config_params(self):
"""Check items in configuration files.
Check for required and invalid configuration items.
The actual values are not verified for correctness.
"""
if not self.conf.interface_driver:
msg = _('An interface driver must be specified')
LOG.error(msg)
raise SystemExit(msg)
if not self.conf.use_namespaces and not self.conf.router_id:
msg = _('Router id is required if not using namespaces.')
LOG.error(msg)
raise SystemExit(msg)
def _destroy_router_namespaces(self, only_router_id=None):
"""Destroy router namespaces on the host to eliminate all stale
linux devices, iptables rules, and namespaces.
If only_router_id is passed, only destroy single namespace, to allow
for multiple l3 agents on the same host, without stepping on each
other's toes on init. This only makes sense if only_router_id is set.
"""
root_ip = ip_lib.IPWrapper(self.root_helper)
for ns in root_ip.get_namespaces(self.root_helper):
if ns.startswith(NS_PREFIX):
router_id = ns[len(NS_PREFIX):]
if only_router_id and not only_router_id == router_id:
continue
if self.conf.enable_metadata_proxy:
self._destroy_metadata_proxy(router_id, ns)
try:
self._destroy_router_namespace(ns)
except Exception:
LOG.exception(_("Failed deleting namespace '%s'"), ns)
def _destroy_router_namespace(self, namespace):
ns_ip = ip_lib.IPWrapper(self.root_helper, namespace=namespace)
for d in ns_ip.get_devices(exclude_loopback=True):
if d.name.startswith(INTERNAL_DEV_PREFIX):
# device is on default bridge
self.driver.unplug(d.name, namespace=namespace,
prefix=INTERNAL_DEV_PREFIX)
elif d.name.startswith(EXTERNAL_DEV_PREFIX):
self.driver.unplug(d.name,
bridge=self.conf.external_network_bridge,
namespace=namespace,
prefix=EXTERNAL_DEV_PREFIX)
if self.conf.router_delete_namespaces:
try:
ns_ip.netns.delete(namespace)
except RuntimeError:
msg = _('Failed trying to delete namespace: %s')
LOG.exception(msg % namespace)
def _create_router_namespace(self, ri):
ip_wrapper_root = ip_lib.IPWrapper(self.root_helper)
ip_wrapper = ip_wrapper_root.ensure_namespace(ri.ns_name())
ip_wrapper.netns.execute(['sysctl', '-w', 'net.ipv4.ip_forward=1'])
def _fetch_external_net_id(self):
"""Find UUID of single external network for this agent."""
if self.conf.gateway_external_network_id:
return self.conf.gateway_external_network_id
# L3 agent doesn't use external_network_bridge to handle external
# networks, so bridge_mappings with provider networks will be used
# and the L3 agent is able to handle any external networks.
if not self.conf.external_network_bridge:
return
try:
return self.plugin_rpc.get_external_network_id(self.context)
except rpc_common.RemoteError as e:
if e.exc_type == 'TooManyExternalNetworks':
msg = _(
"The 'gateway_external_network_id' option must be "
"configured for this agent as Neutron has more than "
"one external network.")
raise Exception(msg)
else:
raise
def _router_added(self, router_id, router):
ri = RouterInfo(router_id, self.root_helper,
self.conf.use_namespaces, router)
self.router_info[router_id] = ri
if self.conf.use_namespaces:
self._create_router_namespace(ri)
for c, r in self.metadata_filter_rules():
ri.iptables_manager.ipv4['filter'].add_rule(c, r)
for c, r in self.metadata_nat_rules():
ri.iptables_manager.ipv4['nat'].add_rule(c, r)
ri.iptables_manager.apply()
super(L3NATAgent, self).process_router_add(ri)
if self.conf.enable_metadata_proxy:
self._spawn_metadata_proxy(ri.router_id, ri.ns_name())
def _router_removed(self, router_id):
ri = self.router_info.get(router_id)
if ri is None:
LOG.warn(_("Info for router %s were not found. "
"Skipping router removal"), router_id)
return
ri.router['gw_port'] = None
ri.router[l3_constants.INTERFACE_KEY] = []
ri.router[l3_constants.FLOATINGIP_KEY] = []
self.process_router(ri)
for c, r in self.metadata_filter_rules():
ri.iptables_manager.ipv4['filter'].remove_rule(c, r)
for c, r in self.metadata_nat_rules():
ri.iptables_manager.ipv4['nat'].remove_rule(c, r)
ri.iptables_manager.apply()
if self.conf.enable_metadata_proxy:
self._destroy_metadata_proxy(ri.router_id, ri.ns_name())
del self.router_info[router_id]
self._destroy_router_namespace(ri.ns_name())
def _spawn_metadata_proxy(self, router_id, ns_name):
def callback(pid_file):
metadata_proxy_socket = cfg.CONF.metadata_proxy_socket
proxy_cmd = ['neutron-ns-metadata-proxy',
'--pid_file=%s' % pid_file,
'--metadata_proxy_socket=%s' % metadata_proxy_socket,
'--router_id=%s' % router_id,
'--state_path=%s' % self.conf.state_path,
'--metadata_port=%s' % self.conf.metadata_port]
proxy_cmd.extend(config.get_log_args(
cfg.CONF, 'neutron-ns-metadata-proxy-%s.log' %
router_id))
return proxy_cmd
pm = external_process.ProcessManager(
self.conf,
router_id,
self.root_helper,
ns_name)
pm.enable(callback)
def _destroy_metadata_proxy(self, router_id, ns_name):
pm = external_process.ProcessManager(
self.conf,
router_id,
self.root_helper,
ns_name)
pm.disable()
def _set_subnet_info(self, port):
ips = port['fixed_ips']
if not ips:
raise Exception(_("Router port %s has no IP address") % port['id'])
if len(ips) > 1:
LOG.error(_("Ignoring multiple IPs on router port %s"),
port['id'])
prefixlen = netaddr.IPNetwork(port['subnet']['cidr']).prefixlen
port['ip_cidr'] = "%s/%s" % (ips[0]['ip_address'], prefixlen)
def process_router(self, ri):
ri.iptables_manager.defer_apply_on()
ex_gw_port = self._get_ex_gw_port(ri)
internal_ports = ri.router.get(l3_constants.INTERFACE_KEY, [])
existing_port_ids = set([p['id'] for p in ri.internal_ports])
current_port_ids = set([p['id'] for p in internal_ports
if p['admin_state_up']])
new_ports = [p for p in internal_ports if
p['id'] in current_port_ids and
p['id'] not in existing_port_ids]
old_ports = [p for p in ri.internal_ports if
p['id'] not in current_port_ids]
for p in new_ports:
self._set_subnet_info(p)
self.internal_network_added(ri, p['network_id'], p['id'],
p['ip_cidr'], p['mac_address'])
ri.internal_ports.append(p)
for p in old_ports:
self.internal_network_removed(ri, p['id'], p['ip_cidr'])
ri.internal_ports.remove(p)
internal_cidrs = [p['ip_cidr'] for p in ri.internal_ports]
# TODO(salv-orlando): RouterInfo would be a better place for
# this logic too
ex_gw_port_id = (ex_gw_port and ex_gw_port['id'] or
ri.ex_gw_port and ri.ex_gw_port['id'])
interface_name = None
if ex_gw_port_id:
interface_name = self.get_external_device_name(ex_gw_port_id)
if ex_gw_port and not ri.ex_gw_port:
self._set_subnet_info(ex_gw_port)
self.external_gateway_added(ri, ex_gw_port,
interface_name, internal_cidrs)
elif not ex_gw_port and ri.ex_gw_port:
self.external_gateway_removed(ri, ri.ex_gw_port,
interface_name, internal_cidrs)
# Process SNAT rules for external gateway
ri.perform_snat_action(self._handle_router_snat_rules,
internal_cidrs, interface_name)
# Process SNAT/DNAT rules for floating IPs
if ex_gw_port:
self.process_router_floating_ip_nat_rules(ri)
ri.ex_gw_port = ex_gw_port
ri.enable_snat = ri.router.get('enable_snat')
self.routes_updated(ri)
ri.iptables_manager.defer_apply_off()
# Once NAT rules for floating IPs are safely in place
# configure their addresses on the external gateway port
if ex_gw_port:
self.process_router_floating_ip_addresses(ri, ex_gw_port)
def _handle_router_snat_rules(self, ri, ex_gw_port, internal_cidrs,
interface_name, action):
# Remove all the rules
# This is safe because if use_namespaces is set as False
# then the agent can only configure one router, otherwise
# each router's SNAT rules will be in their own namespace
ri.iptables_manager.ipv4['nat'].empty_chain('POSTROUTING')
ri.iptables_manager.ipv4['nat'].empty_chain('snat')
# Add back the jump to float-snat
ri.iptables_manager.ipv4['nat'].add_rule('snat', '-j $float-snat')
# And add them back if the action if add_rules
if action == 'add_rules' and ex_gw_port:
# ex_gw_port should not be None in this case
ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address']
for rule in self.external_gateway_nat_rules(ex_gw_ip,
internal_cidrs,
interface_name):
ri.iptables_manager.ipv4['nat'].add_rule(*rule)
ri.iptables_manager.apply()
def process_router_floating_ip_nat_rules(self, ri):
"""Configure NAT rules for the router's floating IPs.
Configures iptables rules for the floating ips of the given router
"""
# Clear out all iptables rules for floating ips
ri.iptables_manager.ipv4['nat'].clear_rules_by_tag('floating_ip')
# Loop once to ensure that floating ips are configured.
for fip in ri.router.get(l3_constants.FLOATINGIP_KEY, []):
# Rebuild iptables rules for the floating ip.
fixed = fip['fixed_ip_address']
fip_ip = fip['floating_ip_address']
for chain, rule in self.floating_forward_rules(fip_ip, fixed):
ri.iptables_manager.ipv4['nat'].add_rule(chain, rule,
tag='floating_ip')
ri.iptables_manager.apply()
def process_router_floating_ip_addresses(self, ri, ex_gw_port):
"""Configure IP addresses on router's external gateway interface.
Ensures addresses for existing floating IPs and cleans up
those that should not longer be configured.
"""
interface_name = self.get_external_device_name(ex_gw_port['id'])
device = ip_lib.IPDevice(interface_name, self.root_helper,
namespace=ri.ns_name())
existing_cidrs = set([addr['cidr'] for addr in device.addr.list()])
new_cidrs = set()
# Loop once to ensure that floating ips are configured.
for fip in ri.router.get(l3_constants.FLOATINGIP_KEY, []):
fip_ip = fip['floating_ip_address']
ip_cidr = str(fip_ip) + FLOATING_IP_CIDR_SUFFIX
new_cidrs.add(ip_cidr)
if ip_cidr not in existing_cidrs:
net = netaddr.IPNetwork(ip_cidr)
device.addr.add(net.version, ip_cidr, str(net.broadcast))
self._send_gratuitous_arp_packet(ri, interface_name, fip_ip)
# Clean up addresses that no longer belong on the gateway interface.
for ip_cidr in existing_cidrs - new_cidrs:
if ip_cidr.endswith(FLOATING_IP_CIDR_SUFFIX):
net = netaddr.IPNetwork(ip_cidr)
device.addr.delete(net.version, ip_cidr)
def _get_ex_gw_port(self, ri):
return ri.router.get('gw_port')
def _arping(self, ri, interface_name, ip_address):
arping_cmd = ['arping', '-A',
'-I', interface_name,
'-c', self.conf.send_arp_for_ha,
ip_address]
try:
if self.conf.use_namespaces:
ip_wrapper = ip_lib.IPWrapper(self.root_helper,
namespace=ri.ns_name())
ip_wrapper.netns.execute(arping_cmd, check_exit_code=True)
else:
utils.execute(arping_cmd, check_exit_code=True,
root_helper=self.root_helper)
except Exception as e:
LOG.error(_("Failed sending gratuitous ARP: %s"), str(e))
def _send_gratuitous_arp_packet(self, ri, interface_name, ip_address):
if self.conf.send_arp_for_ha > 0:
eventlet.spawn_n(self._arping, ri, interface_name, ip_address)
def get_internal_device_name(self, port_id):
return (INTERNAL_DEV_PREFIX + port_id)[:self.driver.DEV_NAME_LEN]
def get_external_device_name(self, port_id):
return (EXTERNAL_DEV_PREFIX + port_id)[:self.driver.DEV_NAME_LEN]
def external_gateway_added(self, ri, ex_gw_port,
interface_name, internal_cidrs):
if not ip_lib.device_exists(interface_name,
root_helper=self.root_helper,
namespace=ri.ns_name()):
self.driver.plug(ex_gw_port['network_id'],
ex_gw_port['id'], interface_name,
ex_gw_port['mac_address'],
bridge=self.conf.external_network_bridge,
namespace=ri.ns_name(),
prefix=EXTERNAL_DEV_PREFIX)
# Compute a list of addresses this router is supposed to have.
# This avoids unnecessarily removing those addresses and
# causing a momentarily network outage.
floating_ips = ri.router.get(l3_constants.FLOATINGIP_KEY, [])
preserve_ips = [ip['floating_ip_address'] + FLOATING_IP_CIDR_SUFFIX
for ip in floating_ips]
self.driver.init_l3(interface_name, [ex_gw_port['ip_cidr']],
namespace=ri.ns_name(),
preserve_ips=preserve_ips)
ip_address = ex_gw_port['ip_cidr'].split('/')[0]
self._send_gratuitous_arp_packet(ri, interface_name, ip_address)
gw_ip = ex_gw_port['subnet']['gateway_ip']
if ex_gw_port['subnet']['gateway_ip']:
cmd = ['route', 'add', 'default', 'gw', gw_ip]
if self.conf.use_namespaces:
ip_wrapper = ip_lib.IPWrapper(self.root_helper,
namespace=ri.ns_name())
ip_wrapper.netns.execute(cmd, check_exit_code=False)
else:
utils.execute(cmd, check_exit_code=False,
root_helper=self.root_helper)
def external_gateway_removed(self, ri, ex_gw_port,
interface_name, internal_cidrs):
if ip_lib.device_exists(interface_name,
root_helper=self.root_helper,
namespace=ri.ns_name()):
self.driver.unplug(interface_name,
bridge=self.conf.external_network_bridge,
namespace=ri.ns_name(),
prefix=EXTERNAL_DEV_PREFIX)
def metadata_filter_rules(self):
rules = []
if self.conf.enable_metadata_proxy:
rules.append(('INPUT', '-s 0.0.0.0/0 -d 127.0.0.1 '
'-p tcp -m tcp --dport %s '
'-j ACCEPT' % self.conf.metadata_port))
return rules
def metadata_nat_rules(self):
rules = []
if self.conf.enable_metadata_proxy:
rules.append(('PREROUTING', '-s 0.0.0.0/0 -d 169.254.169.254/32 '
'-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' %
{'interface_name': interface_name})]
for cidr in internal_cidrs:
rules.extend(self.internal_network_nat_rules(ex_gw_ip, cidr))
return rules
def internal_network_added(self, ri, 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)
def internal_network_removed(self, ri, 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)
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_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."""
LOG.debug(_('Got router deleted notification for %s'), router_id)
self.removed_routers.add(router_id)
def routers_updated(self, context, routers):
"""Deal with routers modification and creation RPC message."""
LOG.debug(_('Got routers updated notification :%s'), routers)
if routers:
# This is needed for backward compatibility
if isinstance(routers[0], dict):
routers = [router['id'] for router in routers]
self.updated_routers.update(routers)
def router_removed_from_agent(self, context, payload):
LOG.debug(_('Got router removed from agent :%r'), payload)
self.removed_routers.add(payload['router_id'])
def router_added_to_agent(self, context, payload):
LOG.debug(_('Got router added to agent :%r'), payload)
self.routers_updated(context, payload)
def _process_routers(self, routers, all_routers=False):
pool = eventlet.GreenPool()
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()
# if routers are all the routers we have (They are from router sync on
# starting or when error occurs during running), we seek the
# routers which should be removed.
# If routers are from server side notification, we seek them
# from subset of incoming routers and ones we have now.
if all_routers:
prev_router_ids = set(self.router_info)
else:
prev_router_ids = set(self.router_info) & set(
[router['id'] for router in routers])
cur_router_ids = set()
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 (target_ex_net_id and ex_net_id and
ex_net_id != target_ex_net_id):
continue
cur_router_ids.add(r['id'])
if r['id'] not in self.router_info:
self._router_added(r['id'], r)
ri = self.router_info[r['id']]
ri.router = r
pool.spawn_n(self.process_router, ri)
# identify and remove routers that no longer exist
for router_id in prev_router_ids - cur_router_ids:
pool.spawn_n(self._router_removed, router_id)
pool.waitall()
@lockutils.synchronized('l3-agent', 'neutron-')
def _rpc_loop(self):
# _rpc_loop and _sync_routers_task will not be
# executed in the same time because of lock.
# so we can clear the value of updated_routers
# and removed_routers
try:
LOG.debug(_("Starting RPC loop for %d updated routers"),
len(self.updated_routers))
if self.updated_routers:
router_ids = list(self.updated_routers)
self.updated_routers.clear()
routers = self.plugin_rpc.get_routers(
self.context, router_ids)
self._process_routers(routers)
self._process_router_delete()
LOG.debug(_("RPC loop successfully completed"))
except Exception:
LOG.exception(_("Failed synchronizing routers"))
self.fullsync = True
def _process_router_delete(self):
current_removed_routers = list(self.removed_routers)
for router_id in current_removed_routers:
self._router_removed(router_id)
self.removed_routers.remove(router_id)
def _router_ids(self):
if not self.conf.use_namespaces:
return [self.conf.router_id]
@periodic_task.periodic_task
@lockutils.synchronized('l3-agent', 'neutron-')
def _sync_routers_task(self, context):
if self.services_sync:
super(L3NATAgent, self).process_services_sync(context)
LOG.debug(_("Starting _sync_routers_task - fullsync:%s"),
self.fullsync)
if not self.fullsync:
return
try:
router_ids = self._router_ids()
self.updated_routers.clear()
self.removed_routers.clear()
routers = self.plugin_rpc.get_routers(
context, router_ids)
LOG.debug(_('Processing :%r'), routers)
self._process_routers(routers, all_routers=True)
self.fullsync = False
LOG.debug(_("_sync_routers_task successfully completed"))
except Exception:
LOG.exception(_("Failed synchronizing routers"))
self.fullsync = True
def after_start(self):
LOG.info(_("L3 agent started"))
def _update_routing_table(self, ri, operation, route):
cmd = ['ip', 'route', operation, 'to', route['destination'],
'via', route['nexthop']]
#TODO(nati) move this code to iplib
if self.conf.use_namespaces:
ip_wrapper = ip_lib.IPWrapper(self.conf.root_helper,
namespace=ri.ns_name())
ip_wrapper.netns.execute(cmd, check_exit_code=False)
else:
utils.execute(cmd, check_exit_code=False,
root_helper=self.conf.root_helper)
def routes_updated(self, ri):
new_routes = ri.router['routes']
old_routes = ri.routes
adds, removes = common_utils.diff_list_of_dict(old_routes,
new_routes)
for route in adds:
LOG.debug(_("Added route entry is '%s'"), route)
# remove replaced route from deleted route
for del_route in removes:
if route['destination'] == del_route['destination']:
removes.remove(del_route)
#replace success even if there is no existing route
self._update_routing_table(ri, 'replace', route)
for route in removes:
LOG.debug(_("Removed route entry is '%s'"), route)
self._update_routing_table(ri, 'delete', route)
ri.routes = new_routes
class L3NATAgentWithStateReport(L3NATAgent):
def __init__(self, host, conf=None):
super(L3NATAgentWithStateReport, self).__init__(host=host, conf=conf)
self.state_rpc = agent_rpc.PluginReportStateAPI(topics.PLUGIN)
self.agent_state = {
'binary': 'neutron-l3-agent',
'host': host,
'topic': topics.L3_AGENT,
'configurations': {
'use_namespaces': self.conf.use_namespaces,
'router_id': self.conf.router_id,
'handle_internal_only_routers':
self.conf.handle_internal_only_routers,
'gateway_external_network_id':
self.conf.gateway_external_network_id,
'interface_driver': self.conf.interface_driver},
'start_flag': True,
'agent_type': l3_constants.AGENT_TYPE_L3}
report_interval = cfg.CONF.AGENT.report_interval
self.use_call = True
if report_interval:
self.heartbeat = loopingcall.FixedIntervalLoopingCall(
self._report_state)
self.heartbeat.start(interval=report_interval)
def _report_state(self):
LOG.debug(_("Report state task started"))
num_ex_gw_ports = 0
num_interfaces = 0
num_floating_ips = 0
router_infos = self.router_info.values()
num_routers = len(router_infos)
for ri in router_infos:
ex_gw_port = self._get_ex_gw_port(ri)
if ex_gw_port:
num_ex_gw_ports += 1
num_interfaces += len(ri.router.get(l3_constants.INTERFACE_KEY,
[]))
num_floating_ips += len(ri.router.get(l3_constants.FLOATINGIP_KEY,
[]))
configurations = self.agent_state['configurations']
configurations['routers'] = num_routers
configurations['ex_gw_ports'] = num_ex_gw_ports
configurations['interfaces'] = num_interfaces
configurations['floating_ips'] = num_floating_ips
try:
self.state_rpc.report_state(self.context, self.agent_state,
self.use_call)
self.agent_state.pop('start_flag', None)
self.use_call = False
LOG.debug(_("Report state task successfully completed"))
except AttributeError:
# This means the server does not support report_state
LOG.warn(_("Neutron server does not support state report."
" State report for this agent will be disabled."))
self.heartbeat.stop()
return
except Exception:
LOG.exception(_("Failed reporting state!"))
def agent_updated(self, context, payload):
"""Handle the agent_updated notification event."""
self.fullsync = True
LOG.info(_("agent_updated by server side %s!"), payload)
def main(manager='neutron.agent.l3_agent.L3NATAgentWithStateReport'):
eventlet.monkey_patch()
conf = cfg.CONF
conf.register_opts(L3NATAgent.OPTS)
config.register_agent_state_opts_helper(conf)
config.register_root_helper(conf)
conf.register_opts(interface.OPTS)
conf.register_opts(external_process.OPTS)
conf(project='neutron')
config.setup_logging(conf)
legacy.modernize_quantum_config(conf)
server = neutron_service.Service.create(
binary='neutron-l3-agent',
topic=topics.L3_AGENT,
report_interval=cfg.CONF.AGENT.report_interval,
manager=manager)
service.launch(server).wait()
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