""" # 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 sys import eventlet from eventlet import semaphore import netaddr from quantum.agent.common import config from quantum.agent.linux import external_process from quantum.agent.linux import interface from quantum.agent.linux import ip_lib from quantum.agent.linux import iptables_manager from quantum.agent.linux import utils from quantum.common import constants as l3_constants from quantum.common import topics from quantum import context from quantum import manager from quantum.openstack.common import cfg from quantum.openstack.common import importutils from quantum.openstack.common import log as logging from quantum.openstack.common import periodic_task from quantum.openstack.common.rpc import common as rpc_common from quantum.openstack.common.rpc import proxy from quantum.openstack.common import service from quantum import service as quantum_service LOG = logging.getLogger(__name__) NS_PREFIX = 'qrouter-' INTERNAL_DEV_PREFIX = 'qr-' EXTERNAL_DEV_PREFIX = 'qg-' 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, fullsync=True, router_id=None): """Make a remote process call to retrieve the sync data for routers.""" router_ids = [router_id] if router_id else None return self.call(context, self.make_msg('sync_routers', host=self.host, fullsync=fullsync, 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=None): self.router_id = router_id self.ex_gw_port = None self.internal_ports = [] self.floating_ips = [] self.root_helper = root_helper self.use_namespaces = use_namespaces self.router = router self.iptables_manager = iptables_manager.IptablesManager( root_helper=root_helper, #FIXME(danwent): use_ipv6=True, namespace=self.ns_name()) def ns_name(self): if self.use_namespaces: return NS_PREFIX + self.router_id class L3NATAgent(manager.Manager): 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 Quantum metadata namespace " "proxy.")), cfg.IntOpt('send_arp_for_ha', default=3, help=_("Send this many gratuitous ARPs for HA setup, " "set it below or equal to 0 to disable this " "feature.")), 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" " confgure 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.StrOpt('l3_agent_manager', default='quantum.agent.l3_agent.L3NATAgent', help=_("The Quantum L3 Agent manager.")), ] 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 = {} if not self.conf.interface_driver: LOG.error(_('An interface driver must be specified')) sys.exit(1) try: self.driver = importutils.import_object(self.conf.interface_driver, self.conf) except: LOG.exception(_("Error importing interface driver '%s'"), self.conf.interface_driver) sys.exit(1) self.plugin_rpc = L3PluginApi(topics.PLUGIN, host) self.fullsync = True self.sync_sem = semaphore.Semaphore(1) if self.conf.use_namespaces: self._destroy_all_router_namespaces() super(L3NATAgent, self).__init__(host=self.conf.host) def _destroy_all_router_namespaces(self): """Destroy all router namespaces on the host to eliminate all stale linux devices, iptables rules, and namespaces. """ root_ip = ip_lib.IPWrapper(self.root_helper) for ns in root_ip.get_namespaces(self.root_helper): if ns.startswith(NS_PREFIX): try: self._destroy_router_namespace(ns) except: 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) #(TODO) Address the failure for the deletion of the 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 try: return self.plugin_rpc.get_external_network_id( context.get_admin_context()) except rpc_common.RemoteError as e: if e.exc_type == 'TooManyExternalNetworks': msg = _( "The 'gateway_external_network_id' must be configured" " if Quantum has more than one external network.") raise Exception(msg) else: raise def _router_added(self, router_id, router=None): 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() self._spawn_metadata_proxy(ri) def _router_removed(self, router_id): ri = self.router_info[router_id] 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() self._destroy_metadata_proxy(ri) del self.router_info[router_id] self._destroy_router_namespace(ri.ns_name()) def _spawn_metadata_proxy(self, router_info): def callback(pid_file): return ['quantum-ns-metadata-proxy', '--pid_file=%s' % pid_file, '--router_id=%s' % router_info.router_id, '--state_path=%s' % self.conf.state_path] pm = external_process.ProcessManager( self.conf, router_info.router_id, self.root_helper, router_info.ns_name()) pm.enable(callback) def _destroy_metadata_proxy(self, router_info): pm = external_process.ProcessManager( self.conf, router_info.router_id, self.root_helper, router_info.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): 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) ri.internal_ports.append(p) self.internal_network_added(ri, ex_gw_port, p['network_id'], p['id'], p['ip_cidr'], p['mac_address']) for p in old_ports: ri.internal_ports.remove(p) self.internal_network_removed(ri, ex_gw_port, p['id'], p['ip_cidr']) internal_cidrs = [p['ip_cidr'] for p in ri.internal_ports] 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, internal_cidrs) elif not ex_gw_port and ri.ex_gw_port: self.external_gateway_removed(ri, ri.ex_gw_port, internal_cidrs) if ri.ex_gw_port or ex_gw_port: self.process_router_floating_ips(ri, ex_gw_port) ri.ex_gw_port = ex_gw_port def process_router_floating_ips(self, ri, ex_gw_port): floating_ips = ri.router.get(l3_constants.FLOATINGIP_KEY, []) existing_floating_ip_ids = set([fip['id'] for fip in ri.floating_ips]) cur_floating_ip_ids = set([fip['id'] for fip in floating_ips]) id_to_fip_map = {} for fip in floating_ips: if fip['port_id']: if fip['id'] not in existing_floating_ip_ids: ri.floating_ips.append(fip) self.floating_ip_added(ri, ex_gw_port, fip['floating_ip_address'], fip['fixed_ip_address']) # store to see if floatingip was remapped id_to_fip_map[fip['id']] = fip floating_ip_ids_to_remove = (existing_floating_ip_ids - cur_floating_ip_ids) for fip in ri.floating_ips: if fip['id'] in floating_ip_ids_to_remove: ri.floating_ips.remove(fip) self.floating_ip_removed(ri, ri.ex_gw_port, fip['floating_ip_address'], fip['fixed_ip_address']) else: # handle remapping of a floating IP new_fip = id_to_fip_map[fip['id']] new_fixed_ip = new_fip['fixed_ip_address'] existing_fixed_ip = fip['fixed_ip_address'] if (new_fixed_ip and existing_fixed_ip and new_fixed_ip != existing_fixed_ip): floating_ip = fip['floating_ip_address'] self.floating_ip_removed(ri, ri.ex_gw_port, floating_ip, existing_fixed_ip) self.floating_ip_added(ri, ri.ex_gw_port, floating_ip, new_fixed_ip) ri.floating_ips.remove(fip) ri.floating_ips.append(new_fip) def _get_ex_gw_port(self, ri): return ri.router.get('gw_port') def _send_gratuitous_arp_packet(self, ri, interface_name, ip_address): if self.conf.send_arp_for_ha > 0: arping_cmd = ['arping', '-A', '-U', '-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 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, internal_cidrs): interface_name = self.get_external_device_name(ex_gw_port['id']) ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address'] 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) self.driver.init_l3(interface_name, [ex_gw_port['ip_cidr']], namespace=ri.ns_name()) 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) for (c, r) in self.external_gateway_nat_rules(ex_gw_ip, internal_cidrs, interface_name): ri.iptables_manager.ipv4['nat'].add_rule(c, r) ri.iptables_manager.apply() def external_gateway_removed(self, ri, ex_gw_port, internal_cidrs): interface_name = self.get_external_device_name(ex_gw_port['id']) 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) ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address'] for c, r in self.external_gateway_nat_rules(ex_gw_ip, internal_cidrs, interface_name): ri.iptables_manager.ipv4['nat'].remove_rule(c, r) ri.iptables_manager.apply() def metadata_filter_rules(self): rules = [] 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 = [] 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' % 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()