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# Copyright 2014, Hewlett-Packard Development Company, L.P. 

# 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. 

 

from oslo_config import cfg 

from oslo_log import log as logging 

import oslo_messaging 

from oslo_utils import excutils 

 

from neutron.common import constants as n_const 

from neutron.common import utils as n_utils 

from neutron.i18n import _LE, _LI, _LW 

from neutron.plugins.common import constants as p_const 

from neutron.plugins.ml2.drivers.openvswitch.agent.common import constants 

 

LOG = logging.getLogger(__name__) 

 

cfg.CONF.import_group('AGENT', 'neutron.plugins.ml2.drivers.openvswitch.' 

                      'agent.common.config') 

 

 

# A class to represent a DVR-hosted subnet including vif_ports resident on 

# that subnet 

class LocalDVRSubnetMapping(object): 

    def __init__(self, subnet, csnat_ofport=constants.OFPORT_INVALID): 

        # set of commpute ports on on this dvr subnet 

        self.compute_ports = {} 

        self.subnet = subnet 

        self.csnat_ofport = csnat_ofport 

        self.dvr_owned = False 

 

    def __str__(self): 

        return ("subnet = %s compute_ports = %s csnat_port = %s" 

                " is_dvr_owned = %s" % 

                (self.subnet, self.get_compute_ofports(), 

                 self.get_csnat_ofport(), self.is_dvr_owned())) 

 

    def get_subnet_info(self): 

        return self.subnet 

 

    def set_dvr_owned(self, owned): 

        self.dvr_owned = owned 

 

    def is_dvr_owned(self): 

        return self.dvr_owned 

 

    def add_compute_ofport(self, vif_id, ofport): 

        self.compute_ports[vif_id] = ofport 

 

    def remove_compute_ofport(self, vif_id): 

        self.compute_ports.pop(vif_id, 0) 

 

    def remove_all_compute_ofports(self): 

        self.compute_ports.clear() 

 

    def get_compute_ofports(self): 

        return self.compute_ports 

 

    def set_csnat_ofport(self, ofport): 

        self.csnat_ofport = ofport 

 

    def get_csnat_ofport(self): 

        return self.csnat_ofport 

 

 

class OVSPort(object): 

    def __init__(self, id, ofport, mac, device_owner): 

        self.id = id 

        self.mac = mac 

        self.ofport = ofport 

        self.subnets = set() 

        self.device_owner = device_owner 

 

    def __str__(self): 

        return ("OVSPort: id = %s, ofport = %s, mac = %s, " 

                "device_owner = %s, subnets = %s" % 

                (self.id, self.ofport, self.mac, 

                 self.device_owner, self.subnets)) 

 

    def add_subnet(self, subnet_id): 

        self.subnets.add(subnet_id) 

 

    def remove_subnet(self, subnet_id): 

        self.subnets.remove(subnet_id) 

 

    def remove_all_subnets(self): 

        self.subnets.clear() 

 

    def get_subnets(self): 

        return self.subnets 

 

    def get_device_owner(self): 

        return self.device_owner 

 

    def get_mac(self): 

        return self.mac 

 

    def get_ofport(self): 

        return self.ofport 

 

 

class OVSDVRNeutronAgent(object): 

    ''' 

    Implements OVS-based DVR(Distributed Virtual Router), for overlay networks. 

    ''' 

    # history 

    #   1.0 Initial version 

 

    def __init__(self, context, plugin_rpc, integ_br, tun_br, 

                 bridge_mappings, phys_brs, int_ofports, phys_ofports, 

                 patch_int_ofport=constants.OFPORT_INVALID, 

                 patch_tun_ofport=constants.OFPORT_INVALID, 

                 host=None, enable_tunneling=False, 

                 enable_distributed_routing=False): 

        self.context = context 

        self.plugin_rpc = plugin_rpc 

        self.host = host 

        self.enable_tunneling = enable_tunneling 

        self.enable_distributed_routing = enable_distributed_routing 

        self.bridge_mappings = bridge_mappings 

        self.phys_brs = phys_brs 

        self.int_ofports = int_ofports 

        self.phys_ofports = phys_ofports 

        self.reset_ovs_parameters(integ_br, tun_br, 

                                  patch_int_ofport, patch_tun_ofport) 

        self.reset_dvr_parameters() 

        self.dvr_mac_address = None 

140        if self.enable_distributed_routing: 

            self.get_dvr_mac_address() 

        self.conf = cfg.CONF 

 

    def setup_dvr_flows(self): 

        self.setup_dvr_flows_on_integ_br() 

        self.setup_dvr_flows_on_tun_br() 

        self.setup_dvr_flows_on_phys_br() 

        self.setup_dvr_mac_flows_on_all_brs() 

 

    def reset_ovs_parameters(self, integ_br, tun_br, 

                             patch_int_ofport, patch_tun_ofport): 

        '''Reset the openvswitch parameters''' 

        self.int_br = integ_br 

        self.tun_br = tun_br 

        self.patch_int_ofport = patch_int_ofport 

        self.patch_tun_ofport = patch_tun_ofport 

 

    def reset_dvr_parameters(self): 

        '''Reset the DVR parameters''' 

        self.local_dvr_map = {} 

        self.local_csnat_map = {} 

        self.local_ports = {} 

        self.registered_dvr_macs = set() 

 

    def get_dvr_mac_address(self): 

        try: 

            self.get_dvr_mac_address_with_retry() 

        except oslo_messaging.RemoteError as e: 

            LOG.warning(_LW('L2 agent could not get DVR MAC address at ' 

                            'startup due to RPC error.  It happens when the ' 

                            'server does not support this RPC API.  Detailed ' 

                            'message: %s'), e) 

        except oslo_messaging.MessagingTimeout: 

            LOG.error(_LE('DVR: Failed to obtain a valid local ' 

                          'DVR MAC address - L2 Agent operating ' 

                          'in Non-DVR Mode')) 

 

        if not self.in_distributed_mode(): 

            # switch all traffic using L2 learning 

            # REVISIT(yamamoto): why to install the same flow as 

            # setup_integration_br? 

            self.int_br.install_normal() 

 

    def get_dvr_mac_address_with_retry(self): 

        # Get the local DVR MAC Address from the Neutron Server. 

        # This is the first place where we contact the server on startup 

        # so retry in case it's not ready to respond 

exit        for retry_count in reversed(range(5)): 

            try: 

                details = self.plugin_rpc.get_dvr_mac_address_by_host( 

                    self.context, self.host) 

            except oslo_messaging.MessagingTimeout as e: 

                with excutils.save_and_reraise_exception() as ctx: 

187                    if retry_count > 0: 

                        ctx.reraise = False 

                        LOG.warning(_LW('L2 agent could not get DVR MAC ' 

                                        'address from server. Retrying. ' 

                                        'Detailed message: %s'), e) 

            else: 

                LOG.debug("L2 Agent DVR: Received response for " 

                          "get_dvr_mac_address_by_host() from " 

                          "plugin: %r", details) 

                self.dvr_mac_address = details['mac_address'] 

                return 

 

    def setup_dvr_flows_on_integ_br(self): 

        '''Setup up initial dvr flows into br-int''' 

        if not self.in_distributed_mode(): 

            return 

 

        LOG.info(_LI("L2 Agent operating in DVR Mode with MAC %s"), 

                 self.dvr_mac_address) 

        # Remove existing flows in integration bridge 

214        if self.conf.AGENT.drop_flows_on_start: 

            self.int_br.delete_flows() 

 

        # Add a canary flow to int_br to track OVS restarts 

        self.int_br.setup_canary_table() 

 

        # Insert 'drop' action as the default for Table DVR_TO_SRC_MAC 

        self.int_br.install_drop(table_id=constants.DVR_TO_SRC_MAC, priority=1) 

 

        self.int_br.install_drop(table_id=constants.DVR_TO_SRC_MAC_VLAN, 

                                 priority=1) 

 

        # Insert 'normal' action as the default for Table LOCAL_SWITCHING 

        self.int_br.install_normal(table_id=constants.LOCAL_SWITCHING, 

                                   priority=1) 

 

        for physical_network in self.bridge_mappings: 

            self.int_br.install_drop(table_id=constants.LOCAL_SWITCHING, 

                                     priority=2, 

                                     in_port=self.int_ofports[ 

                                         physical_network]) 

 

    def setup_dvr_flows_on_tun_br(self): 

        '''Setup up initial dvr flows into br-tun''' 

240        if not self.enable_tunneling or not self.in_distributed_mode(): 

            return 

 

        self.tun_br.install_goto(dest_table_id=constants.DVR_PROCESS, 

                                 priority=1, 

                                 in_port=self.patch_int_ofport) 

 

        # table-miss should be sent to learning table 

        self.tun_br.install_goto(table_id=constants.DVR_NOT_LEARN, 

                                 dest_table_id=constants.LEARN_FROM_TUN) 

 

        self.tun_br.install_goto(table_id=constants.DVR_PROCESS, 

                                 dest_table_id=constants.PATCH_LV_TO_TUN) 

 

    def setup_dvr_flows_on_phys_br(self): 

        '''Setup up initial dvr flows into br-phys''' 

256        if not self.in_distributed_mode(): 

            return 

 

        for physical_network in self.bridge_mappings: 

            self.phys_brs[physical_network].install_goto( 

                in_port=self.phys_ofports[physical_network], 

                priority=2, 

                dest_table_id=constants.DVR_PROCESS_VLAN) 

            self.phys_brs[physical_network].install_goto( 

                priority=1, 

                dest_table_id=constants.DVR_NOT_LEARN_VLAN) 

            self.phys_brs[physical_network].install_goto( 

                table_id=constants.DVR_PROCESS_VLAN, 

                priority=0, 

                dest_table_id=constants.LOCAL_VLAN_TRANSLATION) 

            self.phys_brs[physical_network].install_drop( 

                table_id=constants.LOCAL_VLAN_TRANSLATION, 

                in_port=self.phys_ofports[physical_network], 

                priority=2) 

            self.phys_brs[physical_network].install_normal( 

                table_id=constants.DVR_NOT_LEARN_VLAN, 

                priority=1) 

 

    def _add_dvr_mac_for_phys_br(self, physical_network, mac): 

        self.int_br.add_dvr_mac_vlan(mac=mac, 

                                     port=self.int_ofports[physical_network]) 

        phys_br = self.phys_brs[physical_network] 

        phys_br.add_dvr_mac_vlan(mac=mac, 

                                 port=self.phys_ofports[physical_network]) 

 

    def _remove_dvr_mac_for_phys_br(self, physical_network, mac): 

        # REVISIT(yamamoto): match in_port as well? 

        self.int_br.remove_dvr_mac_vlan(mac=mac) 

        phys_br = self.phys_brs[physical_network] 

        # REVISIT(yamamoto): match in_port as well? 

        phys_br.remove_dvr_mac_vlan(mac=mac) 

 

    def _add_dvr_mac_for_tun_br(self, mac): 

        self.int_br.add_dvr_mac_tun(mac=mac, port=self.patch_tun_ofport) 

        self.tun_br.add_dvr_mac_tun(mac=mac, port=self.patch_int_ofport) 

 

    def _remove_dvr_mac_for_tun_br(self, mac): 

        self.int_br.remove_dvr_mac_tun(mac=mac, port=self.patch_tun_ofport) 

        # REVISIT(yamamoto): match in_port as well? 

        self.tun_br.remove_dvr_mac_tun(mac=mac) 

 

    def _add_dvr_mac(self, mac): 

        for physical_network in self.bridge_mappings: 

            self._add_dvr_mac_for_phys_br(physical_network, mac) 

304        if self.enable_tunneling: 

            self._add_dvr_mac_for_tun_br(mac) 

        LOG.debug("Added DVR MAC flow for %s", mac) 

        self.registered_dvr_macs.add(mac) 

 

    def _remove_dvr_mac(self, mac): 

        for physical_network in self.bridge_mappings: 

            self._remove_dvr_mac_for_phys_br(physical_network, mac) 

312        if self.enable_tunneling: 

            self._remove_dvr_mac_for_tun_br(mac) 

        LOG.debug("Removed DVR MAC flow for %s", mac) 

        self.registered_dvr_macs.remove(mac) 

 

    def setup_dvr_mac_flows_on_all_brs(self): 

320        if not self.in_distributed_mode(): 

            LOG.debug("Not in distributed mode, ignoring invocation " 

                      "of get_dvr_mac_address_list() ") 

            return 

        dvr_macs = self.plugin_rpc.get_dvr_mac_address_list(self.context) 

        LOG.debug("L2 Agent DVR: Received these MACs: %r", dvr_macs) 

        for mac in dvr_macs: 

            if mac['mac_address'] == self.dvr_mac_address: 

                continue 

            self._add_dvr_mac(mac['mac_address']) 

 

    def dvr_mac_address_update(self, dvr_macs): 

329        if not self.dvr_mac_address: 

            LOG.debug("Self mac unknown, ignoring this " 

                      "dvr_mac_address_update() ") 

            return 

 

        dvr_host_macs = set() 

        for entry in dvr_macs: 

336            if entry['mac_address'] == self.dvr_mac_address: 

                continue 

            dvr_host_macs.add(entry['mac_address']) 

 

340        if dvr_host_macs == self.registered_dvr_macs: 

            LOG.debug("DVR Mac address already up to date") 

            return 

 

        dvr_macs_added = dvr_host_macs - self.registered_dvr_macs 

        dvr_macs_removed = self.registered_dvr_macs - dvr_host_macs 

 

        for oldmac in dvr_macs_removed: 

            self._remove_dvr_mac(oldmac) 

 

        for newmac in dvr_macs_added: 

            self._add_dvr_mac(newmac) 

 

    def in_distributed_mode(self): 

        return self.dvr_mac_address is not None 

 

    def is_dvr_router_interface(self, device_owner): 

        return device_owner == n_const.DEVICE_OWNER_DVR_INTERFACE 

 

    def process_tunneled_network(self, network_type, lvid, segmentation_id): 

        self.tun_br.provision_local_vlan( 

            network_type=network_type, 

            lvid=lvid, 

            segmentation_id=segmentation_id, 

            distributed=self.in_distributed_mode()) 

 

    def _bind_distributed_router_interface_port(self, port, lvm, 

                                                fixed_ips, device_owner): 

        # since distributed router port must have only one fixed 

        # IP, directly use fixed_ips[0] 

        fixed_ip = fixed_ips[0] 

        subnet_uuid = fixed_ip['subnet_id'] 

        csnat_ofport = constants.OFPORT_INVALID 

        ldm = None 

374        if subnet_uuid in self.local_dvr_map: 

            ldm = self.local_dvr_map[subnet_uuid] 

            csnat_ofport = ldm.get_csnat_ofport() 

            if csnat_ofport == constants.OFPORT_INVALID: 

                LOG.error(_LE("DVR: Duplicate DVR router interface detected " 

                              "for subnet %s"), subnet_uuid) 

                return 

        else: 

            # set up LocalDVRSubnetMapping available for this subnet 

            subnet_info = self.plugin_rpc.get_subnet_for_dvr( 

                self.context, subnet_uuid, fixed_ips=fixed_ips) 

385            if not subnet_info: 

                LOG.error(_LE("DVR: Unable to retrieve subnet information " 

                              "for subnet_id %s"), subnet_uuid) 

                return 

            LOG.debug("get_subnet_for_dvr for subnet %(uuid)s " 

                      "returned with %(info)s", 

                      {"uuid": subnet_uuid, "info": subnet_info}) 

            ldm = LocalDVRSubnetMapping(subnet_info) 

            self.local_dvr_map[subnet_uuid] = ldm 

 

        # DVR takes over 

        ldm.set_dvr_owned(True) 

 

        vlan_to_use = lvm.vlan 

        if lvm.network_type == p_const.TYPE_VLAN: 

            vlan_to_use = lvm.segmentation_id 

 

        subnet_info = ldm.get_subnet_info() 

        ip_version = subnet_info['ip_version'] 

        local_compute_ports = ( 

            self.plugin_rpc.get_ports_on_host_by_subnet( 

                self.context, self.host, subnet_uuid)) 

        LOG.debug("DVR: List of ports received from " 

                  "get_ports_on_host_by_subnet %s", 

                  local_compute_ports) 

        vif_by_id = self.int_br.get_vifs_by_ids( 

            [prt['id'] for prt in local_compute_ports]) 

412        for prt in local_compute_ports: 

            vif = vif_by_id.get(prt['id']) 

            if not vif: 

                continue 

            ldm.add_compute_ofport(vif.vif_id, vif.ofport) 

            if vif.vif_id in self.local_ports: 

                # ensure if a compute port is already on 

                # a different dvr routed subnet 

                # if yes, queue this subnet to that port 

                comp_ovsport = self.local_ports[vif.vif_id] 

                comp_ovsport.add_subnet(subnet_uuid) 

            else: 

                # the compute port is discovered first here that its on 

                # a dvr routed subnet queue this subnet to that port 

                comp_ovsport = OVSPort(vif.vif_id, vif.ofport, 

                                  vif.vif_mac, prt['device_owner']) 

                comp_ovsport.add_subnet(subnet_uuid) 

                self.local_ports[vif.vif_id] = comp_ovsport 

            # create rule for just this vm port 

            self.int_br.install_dvr_to_src_mac( 

                network_type=lvm.network_type, 

                vlan_tag=vlan_to_use, 

                gateway_mac=subnet_info['gateway_mac'], 

                dst_mac=comp_ovsport.get_mac(), 

                dst_port=comp_ovsport.get_ofport()) 

 

        if lvm.network_type == p_const.TYPE_VLAN: 

            # TODO(vivek) remove the IPv6 related flows once SNAT is not 

            # used for IPv6 DVR. 

            br = self.phys_brs[lvm.physical_network] 

        if lvm.network_type in constants.TUNNEL_NETWORK_TYPES: 

            br = self.tun_br 

        # TODO(vivek) remove the IPv6 related flows once SNAT is not 

        # used for IPv6 DVR. 

        if ip_version == 4: 

            br.install_dvr_process_ipv4( 

                vlan_tag=lvm.vlan, gateway_ip=subnet_info['gateway_ip']) 

        else: 

            br.install_dvr_process_ipv6( 

                vlan_tag=lvm.vlan, gateway_mac=subnet_info['gateway_mac']) 

        br.install_dvr_process( 

            vlan_tag=lvm.vlan, vif_mac=port.vif_mac, 

            dvr_mac_address=self.dvr_mac_address) 

 

        # the dvr router interface is itself a port, so capture it 

        # queue this subnet to that port. A subnet appears only once as 

        # a router interface on any given router 

        ovsport = OVSPort(port.vif_id, port.ofport, 

                          port.vif_mac, device_owner) 

        ovsport.add_subnet(subnet_uuid) 

        self.local_ports[port.vif_id] = ovsport 

 

    def _bind_port_on_dvr_subnet(self, port, lvm, fixed_ips, 

                                 device_owner): 

        # Handle new compute port added use-case 

        subnet_uuid = None 

        for ips in fixed_ips: 

469            if ips['subnet_id'] not in self.local_dvr_map: 

                continue 

            subnet_uuid = ips['subnet_id'] 

            ldm = self.local_dvr_map[subnet_uuid] 

475            if not ldm.is_dvr_owned(): 

                # well this is CSNAT stuff, let dvr come in 

                # and do plumbing for this vm later 

                continue 

 

            # This confirms that this compute port belongs 

            # to a dvr hosted subnet. 

            # Accommodate this VM Port into the existing rule in 

            # the integration bridge 

            LOG.debug("DVR: Plumbing compute port %s", port.vif_id) 

            subnet_info = ldm.get_subnet_info() 

            ldm.add_compute_ofport(port.vif_id, port.ofport) 

488            if port.vif_id in self.local_ports: 

                # ensure if a compute port is already on a different 

                # dvr routed subnet 

                # if yes, queue this subnet to that port 

                ovsport = self.local_ports[port.vif_id] 

                ovsport.add_subnet(subnet_uuid) 

            else: 

                # the compute port is discovered first here that its 

                # on a dvr routed subnet, queue this subnet to that port 

                ovsport = OVSPort(port.vif_id, port.ofport, 

                                  port.vif_mac, device_owner) 

                ovsport.add_subnet(subnet_uuid) 

                self.local_ports[port.vif_id] = ovsport 

            vlan_to_use = lvm.vlan 

            if lvm.network_type == p_const.TYPE_VLAN: 

                vlan_to_use = lvm.segmentation_id 

            # create a rule for this vm port 

            self.int_br.install_dvr_to_src_mac( 

                network_type=lvm.network_type, 

                vlan_tag=vlan_to_use, 

                gateway_mac=subnet_info['gateway_mac'], 

                dst_mac=ovsport.get_mac(), 

                dst_port=ovsport.get_ofport()) 

 

    def _bind_centralized_snat_port_on_dvr_subnet(self, port, lvm, 

                                                  fixed_ips, device_owner): 

        # since centralized-SNAT (CSNAT) port must have only one fixed 

        # IP, directly use fixed_ips[0] 

        fixed_ip = fixed_ips[0] 

516        if port.vif_id in self.local_ports: 

            # throw an error if CSNAT port is already on a different 

            # dvr routed subnet 

            ovsport = self.local_ports[port.vif_id] 

            subs = list(ovsport.get_subnets()) 

            if subs[0] == fixed_ip['subnet_id']: 

                return 

            LOG.error(_LE("Centralized-SNAT port %(port)s on subnet " 

                          "%(port_subnet)s already seen on a different " 

                          "subnet %(orig_subnet)s"), { 

                "port": port.vif_id, 

                "port_subnet": fixed_ip['subnet_id'], 

                "orig_subnet": subs[0], 

            }) 

            return 

        subnet_uuid = fixed_ip['subnet_id'] 

        ldm = None 

        subnet_info = None 

539        if subnet_uuid not in self.local_dvr_map: 

            # no csnat ports seen on this subnet - create csnat state 

            # for this subnet 

            subnet_info = self.plugin_rpc.get_subnet_for_dvr( 

                self.context, subnet_uuid, fixed_ips=fixed_ips) 

            ldm = LocalDVRSubnetMapping(subnet_info, port.ofport) 

            self.local_dvr_map[subnet_uuid] = ldm 

        else: 

            ldm = self.local_dvr_map[subnet_uuid] 

            subnet_info = ldm.get_subnet_info() 

            # Store csnat OF Port in the existing DVRSubnetMap 

            ldm.set_csnat_ofport(port.ofport) 

 

        # create ovsPort footprint for csnat port 

        ovsport = OVSPort(port.vif_id, port.ofport, 

                          port.vif_mac, device_owner) 

        ovsport.add_subnet(subnet_uuid) 

        self.local_ports[port.vif_id] = ovsport 

        vlan_to_use = lvm.vlan 

551        if lvm.network_type == p_const.TYPE_VLAN: 

            vlan_to_use = lvm.segmentation_id 

        self.int_br.install_dvr_to_src_mac( 

            network_type=lvm.network_type, 

            vlan_tag=vlan_to_use, 

            gateway_mac=subnet_info['gateway_mac'], 

            dst_mac=ovsport.get_mac(), 

            dst_port=ovsport.get_ofport()) 

 

    def bind_port_to_dvr(self, port, local_vlan_map, 

                         fixed_ips, device_owner): 

        if not self.in_distributed_mode(): 

            return 

 

566        if local_vlan_map.network_type not in (constants.TUNNEL_NETWORK_TYPES 

                                               + [p_const.TYPE_VLAN]): 

            LOG.debug("DVR: Port %s is with network_type %s not supported" 

                      " for dvr plumbing" % (port.vif_id, 

                                             local_vlan_map.network_type)) 

            return 

 

        if device_owner == n_const.DEVICE_OWNER_DVR_INTERFACE: 

            self._bind_distributed_router_interface_port(port, 

                                                         local_vlan_map, 

                                                         fixed_ips, 

                                                         device_owner) 

 

        if device_owner and n_utils.is_dvr_serviced(device_owner): 

            self._bind_port_on_dvr_subnet(port, local_vlan_map, 

                                          fixed_ips, 

                                          device_owner) 

 

        if device_owner == n_const.DEVICE_OWNER_ROUTER_SNAT: 

            self._bind_centralized_snat_port_on_dvr_subnet(port, 

                                                           local_vlan_map, 

                                                           fixed_ips, 

                                                           device_owner) 

 

    def _unbind_distributed_router_interface_port(self, port, lvm): 

        ovsport = self.local_ports[port.vif_id] 

        # removal of distributed router interface 

        subnet_ids = ovsport.get_subnets() 

        subnet_set = set(subnet_ids) 

        network_type = lvm.network_type 

        physical_network = lvm.physical_network 

        vlan_to_use = lvm.vlan 

        if network_type == p_const.TYPE_VLAN: 

            vlan_to_use = lvm.segmentation_id 

        # ensure we process for all the subnets laid on this removed port 

        for sub_uuid in subnet_set: 

601            if sub_uuid not in self.local_dvr_map: 

                continue 

            ldm = self.local_dvr_map[sub_uuid] 

            subnet_info = ldm.get_subnet_info() 

            ip_version = subnet_info['ip_version'] 

            # DVR is no more owner 

            ldm.set_dvr_owned(False) 

            # remove all vm rules for this dvr subnet 

            # clear of compute_ports altogether 

            compute_ports = ldm.get_compute_ofports() 

611            for vif_id in compute_ports: 

                comp_port = self.local_ports[vif_id] 

                self.int_br.delete_dvr_to_src_mac( 

                    network_type=network_type, 

                    vlan_tag=vlan_to_use, dst_mac=comp_port.get_mac()) 

            ldm.remove_all_compute_ofports() 

 

622            if ldm.get_csnat_ofport() == constants.OFPORT_INVALID: 

                # if there is no csnat port for this subnet, remove 

                # this subnet from local_dvr_map, as no dvr (or) csnat 

                # ports available on this agent anymore 

                self.local_dvr_map.pop(sub_uuid, None) 

            if network_type == p_const.TYPE_VLAN: 

                br = self.phys_brs[physical_network] 

            if network_type in constants.TUNNEL_NETWORK_TYPES: 

                br = self.tun_br 

            if ip_version == 4: 

                br.delete_dvr_process_ipv4( 

                    vlan_tag=lvm.vlan, gateway_ip=subnet_info['gateway_ip']) 

            else: 

                br.delete_dvr_process_ipv6( 

                    vlan_tag=lvm.vlan, gateway_mac=subnet_info['gateway_mac']) 

            ovsport.remove_subnet(sub_uuid) 

 

        if lvm.network_type == p_const.TYPE_VLAN: 

            br = self.phys_brs[physical_network] 

        if lvm.network_type in constants.TUNNEL_NETWORK_TYPES: 

            br = self.tun_br 

        br.delete_dvr_process(vlan_tag=lvm.vlan, vif_mac=port.vif_mac) 

 

        # release port state 

        self.local_ports.pop(port.vif_id, None) 

 

    def _unbind_port_on_dvr_subnet(self, port, lvm): 

        ovsport = self.local_ports[port.vif_id] 

        # This confirms that this compute port being removed belonged 

        # to a dvr hosted subnet. 

        LOG.debug("DVR: Removing plumbing for compute port %s", port) 

        subnet_ids = ovsport.get_subnets() 

        # ensure we process for all the subnets laid on this port 

        for sub_uuid in subnet_ids: 

652            if sub_uuid not in self.local_dvr_map: 

                continue 

            ldm = self.local_dvr_map[sub_uuid] 

            ldm.remove_compute_ofport(port.vif_id) 

            vlan_to_use = lvm.vlan 

657            if lvm.network_type == p_const.TYPE_VLAN: 

                vlan_to_use = lvm.segmentation_id 

            # first remove this vm port rule 

            self.int_br.delete_dvr_to_src_mac( 

                network_type=lvm.network_type, 

                vlan_tag=vlan_to_use, dst_mac=ovsport.get_mac()) 

        # release port state 

        self.local_ports.pop(port.vif_id, None) 

 

    def _unbind_centralized_snat_port_on_dvr_subnet(self, port, lvm): 

        ovsport = self.local_ports[port.vif_id] 

        # This confirms that this compute port being removed belonged 

        # to a dvr hosted subnet. 

        LOG.debug("DVR: Removing plumbing for csnat port %s", port) 

        sub_uuid = list(ovsport.get_subnets())[0] 

        # ensure we process for all the subnets laid on this port 

673        if sub_uuid not in self.local_dvr_map: 

            return 

        ldm = self.local_dvr_map[sub_uuid] 

        ldm.set_csnat_ofport(constants.OFPORT_INVALID) 

        vlan_to_use = lvm.vlan 

678        if lvm.network_type == p_const.TYPE_VLAN: 

            vlan_to_use = lvm.segmentation_id 

        # then remove csnat port rule 

        self.int_br.delete_dvr_to_src_mac( 

            network_type=lvm.network_type, 

            vlan_tag=vlan_to_use, dst_mac=ovsport.get_mac()) 

688        if not ldm.is_dvr_owned(): 

            # if not owned by DVR (only used for csnat), remove this 

            # subnet state altogether 

            self.local_dvr_map.pop(sub_uuid, None) 

        # release port state 

        self.local_ports.pop(port.vif_id, None) 

 

    def unbind_port_from_dvr(self, vif_port, local_vlan_map): 

        if not self.in_distributed_mode(): 

            return 

        # Handle port removed use-case 

695        if vif_port and vif_port.vif_id not in self.local_ports: 

            LOG.debug("DVR: Non distributed port, ignoring %s", vif_port) 

            return 

 

        ovsport = self.local_ports[vif_port.vif_id] 

        device_owner = ovsport.get_device_owner() 

 

        if device_owner == n_const.DEVICE_OWNER_DVR_INTERFACE: 

            self._unbind_distributed_router_interface_port(vif_port, 

                                                           local_vlan_map) 

 

        if device_owner and n_utils.is_dvr_serviced(device_owner): 

            self._unbind_port_on_dvr_subnet(vif_port, 

                                            local_vlan_map) 

 

        if device_owner == n_const.DEVICE_OWNER_ROUTER_SNAT: 

            self._unbind_centralized_snat_port_on_dvr_subnet(vif_port, 

                                                             local_vlan_map)