# Copyright (c) 2015 OpenStack Foundation # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. import os from oslo_log import log as logging from neutron.agent.l3 import fip_rule_priority_allocator as frpa from neutron.agent.l3 import link_local_allocator as lla from neutron.agent.l3 import namespaces from neutron.agent.linux import ip_lib from neutron.agent.linux import iptables_manager from neutron.common import utils as common_utils from neutron.ipam import utils as ipam_utils LOG = logging.getLogger(__name__) FIP_NS_PREFIX = 'fip-' FIP_EXT_DEV_PREFIX = 'fg-' FIP_2_ROUTER_DEV_PREFIX = 'fpr-' ROUTER_2_FIP_DEV_PREFIX = namespaces.ROUTER_2_FIP_DEV_PREFIX # Route Table index for FIPs FIP_RT_TBL = 16 FIP_LL_SUBNET = '169.254.64.0/18' # Rule priority range for FIPs FIP_PR_START = 32768 FIP_PR_END = FIP_PR_START + 40000 class FipNamespace(namespaces.Namespace): def __init__(self, ext_net_id, agent_conf, driver, use_ipv6): name = self._get_ns_name(ext_net_id) super(FipNamespace, self).__init__( name, agent_conf, driver, use_ipv6) self._ext_net_id = ext_net_id self.agent_conf = agent_conf self.driver = driver self.use_ipv6 = use_ipv6 self.agent_gateway_port = None self._subscribers = set() path = os.path.join(agent_conf.state_path, 'fip-priorities') self._rule_priorities = frpa.FipRulePriorityAllocator(path, FIP_PR_START, FIP_PR_END) self._iptables_manager = iptables_manager.IptablesManager( namespace=self.get_name(), use_ipv6=self.use_ipv6) path = os.path.join(agent_conf.state_path, 'fip-linklocal-networks') self.local_subnets = lla.LinkLocalAllocator(path, FIP_LL_SUBNET) self.destroyed = False @classmethod def _get_ns_name(cls, ext_net_id): return namespaces.build_ns_name(FIP_NS_PREFIX, ext_net_id) def get_name(self): return self._get_ns_name(self._ext_net_id) def get_ext_device_name(self, port_id): return (FIP_EXT_DEV_PREFIX + port_id)[:self.driver.DEV_NAME_LEN] def get_int_device_name(self, router_id): return (FIP_2_ROUTER_DEV_PREFIX + router_id)[:self.driver.DEV_NAME_LEN] def get_rtr_ext_device_name(self, router_id): return (ROUTER_2_FIP_DEV_PREFIX + router_id)[:self.driver.DEV_NAME_LEN] def has_subscribers(self): return len(self._subscribers) != 0 def subscribe(self, external_net_id): is_first = not self.has_subscribers() self._subscribers.add(external_net_id) return is_first def unsubscribe(self, external_net_id): self._subscribers.discard(external_net_id) return not self.has_subscribers() def allocate_rule_priority(self, floating_ip): return self._rule_priorities.allocate(floating_ip) def deallocate_rule_priority(self, floating_ip): self._rule_priorities.release(floating_ip) def _gateway_added(self, ex_gw_port, interface_name): """Add Floating IP gateway port.""" LOG.debug("add gateway interface(%s)", interface_name) ns_name = self.get_name() self.driver.plug(ex_gw_port['network_id'], ex_gw_port['id'], interface_name, ex_gw_port['mac_address'], bridge=self.agent_conf.external_network_bridge, namespace=ns_name, prefix=FIP_EXT_DEV_PREFIX, mtu=ex_gw_port.get('mtu')) # Remove stale fg devices ip_wrapper = ip_lib.IPWrapper(namespace=ns_name) devices = ip_wrapper.get_devices() for device in devices: name = device.name if name.startswith(FIP_EXT_DEV_PREFIX) and name != interface_name: ext_net_bridge = self.agent_conf.external_network_bridge self.driver.unplug(name, bridge=ext_net_bridge, namespace=ns_name, prefix=FIP_EXT_DEV_PREFIX) ip_cidrs = common_utils.fixed_ip_cidrs(ex_gw_port['fixed_ips']) self.driver.init_l3(interface_name, ip_cidrs, namespace=ns_name, clean_connections=True) self.update_gateway_port(ex_gw_port) cmd = ['sysctl', '-w', 'net.ipv4.conf.%s.proxy_arp=1' % interface_name] ip_wrapper.netns.execute(cmd, check_exit_code=False) def create(self): # TODO(Carl) Get this functionality from mlavelle's namespace baseclass LOG.debug("DVR: add fip namespace: %s", self.name) ip_wrapper_root = ip_lib.IPWrapper() ip_wrapper = ip_wrapper_root.ensure_namespace(self.get_name()) # Somewhere in the 3.19 kernel timeframe ip_nonlocal_bind was # changed to be a per-namespace attribute. To be backwards # compatible we need to try both if at first we fail. try: ip_wrapper.netns.execute(['sysctl', '-w', 'net.ipv4.ip_nonlocal_bind=1'], log_fail_as_error=False, run_as_root=True) except RuntimeError: LOG.debug('DVR: fip namespace (%s) does not support setting ' 'net.ipv4.ip_nonlocal_bind, trying in root namespace', self.name) ip_wrapper_root.netns.execute(['sysctl', '-w', 'net.ipv4.ip_nonlocal_bind=1'], run_as_root=True) ip_wrapper.netns.execute(['sysctl', '-w', 'net.ipv4.ip_forward=1']) if self.use_ipv6: ip_wrapper.netns.execute(['sysctl', '-w', 'net.ipv6.conf.all.forwarding=1']) # no connection tracking needed in fip namespace self._iptables_manager.ipv4['raw'].add_rule('PREROUTING', '-j CT --notrack') self._iptables_manager.apply() def delete(self): self.destroyed = True ip_wrapper = ip_lib.IPWrapper(namespace=self.name) for d in ip_wrapper.get_devices(exclude_loopback=True): if d.name.startswith(FIP_2_ROUTER_DEV_PREFIX): # internal link between IRs and FIP NS ip_wrapper.del_veth(d.name) elif d.name.startswith(FIP_EXT_DEV_PREFIX): # single port from FIP NS to br-ext # TODO(carl) Where does the port get deleted? LOG.debug('DVR: unplug: %s', d.name) ext_net_bridge = self.agent_conf.external_network_bridge self.driver.unplug(d.name, bridge=ext_net_bridge, namespace=self.name, prefix=FIP_EXT_DEV_PREFIX) self.agent_gateway_port = None # TODO(mrsmith): add LOG warn if fip count != 0 LOG.debug('DVR: destroy fip namespace: %s', self.name) super(FipNamespace, self).delete() def create_gateway_port(self, agent_gateway_port): """Create Floating IP gateway port. Request port creation from Plugin then creates Floating IP namespace and adds gateway port. """ self.create() iface_name = self.get_ext_device_name(agent_gateway_port['id']) self._gateway_added(agent_gateway_port, iface_name) def _check_for_gateway_ip_change(self, new_agent_gateway_port): def get_gateway_ips(gateway_port): gw_ips = {} if gateway_port: for subnet in gateway_port.get('subnets', []): gateway_ip = subnet.get('gateway_ip', None) if gateway_ip: ip_version = ip_lib.get_ip_version(gateway_ip) gw_ips[ip_version] = gateway_ip return gw_ips new_gw_ips = get_gateway_ips(new_agent_gateway_port) old_gw_ips = get_gateway_ips(self.agent_gateway_port) return new_gw_ips != old_gw_ips def update_gateway_port(self, agent_gateway_port): gateway_ip_not_changed = self.agent_gateway_port and ( not self._check_for_gateway_ip_change(agent_gateway_port)) self.agent_gateway_port = agent_gateway_port if gateway_ip_not_changed: return ns_name = self.get_name() interface_name = self.get_ext_device_name(agent_gateway_port['id']) for fixed_ip in agent_gateway_port['fixed_ips']: ip_lib.send_ip_addr_adv_notif(ns_name, interface_name, fixed_ip['ip_address'], self.agent_conf) ipd = ip_lib.IPDevice(interface_name, namespace=ns_name) for subnet in agent_gateway_port['subnets']: gw_ip = subnet.get('gateway_ip') if gw_ip: is_gateway_not_in_subnet = not ipam_utils.check_subnet_ip( subnet.get('cidr'), gw_ip) if is_gateway_not_in_subnet: ipd.route.add_route(gw_ip, scope='link') ipd.route.add_gateway(gw_ip) def _add_cidr_to_device(self, device, ip_cidr): if not device.addr.list(to=ip_cidr): device.addr.add(ip_cidr, add_broadcast=False) def create_rtr_2_fip_link(self, ri): """Create interface between router and Floating IP namespace.""" LOG.debug("Create FIP link interfaces for router %s", ri.router_id) rtr_2_fip_name = self.get_rtr_ext_device_name(ri.router_id) fip_2_rtr_name = self.get_int_device_name(ri.router_id) fip_ns_name = self.get_name() # add link local IP to interface if ri.rtr_fip_subnet is None: ri.rtr_fip_subnet = self.local_subnets.allocate(ri.router_id) rtr_2_fip, fip_2_rtr = ri.rtr_fip_subnet.get_pair() rtr_2_fip_dev = ip_lib.IPDevice(rtr_2_fip_name, namespace=ri.ns_name) fip_2_rtr_dev = ip_lib.IPDevice(fip_2_rtr_name, namespace=fip_ns_name) if not rtr_2_fip_dev.exists(): ip_wrapper = ip_lib.IPWrapper(namespace=ri.ns_name) rtr_2_fip_dev, fip_2_rtr_dev = ip_wrapper.add_veth(rtr_2_fip_name, fip_2_rtr_name, fip_ns_name) mtu = (self.agent_conf.network_device_mtu or ri.get_ex_gw_port().get('mtu')) if mtu: rtr_2_fip_dev.link.set_mtu(mtu) fip_2_rtr_dev.link.set_mtu(mtu) rtr_2_fip_dev.link.set_up() fip_2_rtr_dev.link.set_up() self._add_cidr_to_device(rtr_2_fip_dev, str(rtr_2_fip)) self._add_cidr_to_device(fip_2_rtr_dev, str(fip_2_rtr)) # add default route for the link local interface rtr_2_fip_dev.route.add_gateway(str(fip_2_rtr.ip), table=FIP_RT_TBL) def scan_fip_ports(self, ri): # don't scan if not dvr or count is not None if ri.dist_fip_count is not None: return # scan system for any existing fip ports ri.dist_fip_count = 0 rtr_2_fip_interface = self.get_rtr_ext_device_name(ri.router_id) device = ip_lib.IPDevice(rtr_2_fip_interface, namespace=ri.ns_name) if device.exists(): existing_cidrs = [addr['cidr'] for addr in device.addr.list()] fip_cidrs = [c for c in existing_cidrs if common_utils.is_cidr_host(c)] for fip_cidr in fip_cidrs: fip_ip = fip_cidr.split('/')[0] rule_pr = self._rule_priorities.allocate(fip_ip) ri.floating_ips_dict[fip_ip] = rule_pr ri.dist_fip_count = len(fip_cidrs)