# Copyright (c) 2013 OpenStack Foundation. # 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. import abc from oslo.config import cfg import six from neutron.common import constants as n_const from neutron.common import log from neutron.openstack.common import log as logging LOG = logging.getLogger(__name__) @six.add_metaclass(abc.ABCMeta) class L2populationRpcCallBackMixin(object): '''General mixin class of L2-population RPC call back. The following methods are called through RPC. add_fdb_entries(), remove_fdb_entries(), update_fdb_entries() The following methods are used in an agent as internal methods. fdb_add(), fdb_remove(), fdb_update() ''' @log.log def add_fdb_entries(self, context, fdb_entries, host=None): if not host or host == cfg.CONF.host: self.fdb_add(context, fdb_entries) @log.log def remove_fdb_entries(self, context, fdb_entries, host=None): if not host or host == cfg.CONF.host: self.fdb_remove(context, fdb_entries) @log.log def update_fdb_entries(self, context, fdb_entries, host=None): if not host or host == cfg.CONF.host: self.fdb_update(context, fdb_entries) @abc.abstractmethod def fdb_add(self, context, fdb_entries): pass @abc.abstractmethod def fdb_remove(self, context, fdb_entries): pass @abc.abstractmethod def fdb_update(self, context, fdb_entries): pass class L2populationRpcCallBackTunnelMixin(L2populationRpcCallBackMixin): '''Mixin class of L2-population call back for Tunnel. The following methods are all used in agents as internal methods. Some of the methods in this class use Local VLAN Mapping, aka lvm. It's a python object with at least the following attributes: ============ ========================================================= Attribute Description ============ ========================================================= vlan An identifier used by the agent to identify a neutron network. network_type A network type found in neutron.plugins.common.constants. ============ ========================================================= NOTE(yamamoto): "Local VLAN" is an OVS-agent term. OVS-agent internally uses 802.1q VLAN tagging to isolate networks. While this class inherited the terms from OVS-agent, it does not assume the specific underlying technologies. E.g. this class is also used by ofagent, where a different mechanism is used. ''' @abc.abstractmethod def add_fdb_flow(self, br, port_info, remote_ip, lvm, ofport): '''Add flow for fdb This method is assumed to be used by method fdb_add_tun. We expect to add a flow entry to send a packet to specified port on bridge. And you may edit some information for local arp response. :param br: represent the bridge on which add_fdb_flow should be applied. :param port_info: list to include mac and ip. [mac, ip] :remote_ip: remote ip address. :param lvm: a local VLAN map of network. :param ofport: a port to add. ''' pass @abc.abstractmethod def del_fdb_flow(self, br, port_info, remote_ip, lvm, ofport): '''Delete flow for fdb This method is assumed to be used by method fdb_remove_tun. We expect to delete a flow entry to send a packet to specified port from bridge. And you may delete some information for local arp response. :param br: represent the bridge on which del_fdb_flow should be applied. :param port_info: a list to contain mac and ip. [mac, ip] :remote_ip: remote ip address. :param lvm: local VLAN map of a network. See add_fdb_flow for more explanation. :param ofport: a port to delete. ''' pass @abc.abstractmethod def setup_tunnel_port(self, br, remote_ip, network_type): '''Setup an added tunnel port. This method is assumed to be used by method fdb_add_tun. We expect to prepare to call add_fdb_flow. It will be mainly adding a port to a bridge. If you need, you may do some preparations for a bridge. :param br: represent the bridge on which setup_tunnel_port should be applied. :param remote_ip: an ip for a port to setup. :param network_type: a type of a network. :returns: an ofport value. value 0 means the port is unavailable. ''' pass @abc.abstractmethod def cleanup_tunnel_port(self, br, tun_ofport, tunnel_type): '''Clean up a deleted tunnel port. This method is assumed to be used by method fdb_remove_tun. We expect to clean up after calling del_fdb_flow. It will be mainly deleting a port from a bridge. If you need, you may do some cleanup for a bridge. :param br: represent the bridge on which cleanup_tunnel_port should be applied. :param tun_ofport: a port value to cleanup. :param tunnel_type: a type of a tunnel. ''' pass @abc.abstractmethod def setup_entry_for_arp_reply(self, br, action, local_vid, mac_address, ip_address): '''Operate the ARP respond information. Update MAC/IPv4 associations, which is typically used by the local ARP responder. For example, OVS-agent sets up flow entries to perform ARP responses. :param br: represent the bridge on which setup_entry_for_arp_reply should be applied. :param action: add/remove flow for arp response information. :param local_vid: id in local VLAN map of network's ARP entry. :param mac_address: MAC string value. :param ip_address: IP string value. ''' pass def get_agent_ports(self, fdb_entries, local_vlan_map): """Generator to yield port info. For each known (i.e found in local_vlan_map) network in fdb_entries, yield (lvm, fdb_entries[network_id]['ports']) pair. :param fdb_entries: l2pop fdb entries :param local_vlan_map: A dict to map network_id to the corresponding lvm entry. """ for network_id, values in fdb_entries.items(): lvm = local_vlan_map.get(network_id) if lvm is None: continue agent_ports = values.get('ports') yield (lvm, agent_ports) @log.log def fdb_add_tun(self, context, br, lvm, agent_ports, ofports): for remote_ip, ports in agent_ports.items(): # Ensure we have a tunnel port with this remote agent ofport = ofports[lvm.network_type].get(remote_ip) if not ofport: ofport = self.setup_tunnel_port(br, remote_ip, lvm.network_type) if ofport == 0: continue for port in ports: self.add_fdb_flow(br, port, remote_ip, lvm, ofport) @log.log def fdb_remove_tun(self, context, br, lvm, agent_ports, ofports): for remote_ip, ports in agent_ports.items(): ofport = ofports[lvm.network_type].get(remote_ip) if not ofport: continue for port in ports: self.del_fdb_flow(br, port, remote_ip, lvm, ofport) if port == n_const.FLOODING_ENTRY: # Check if this tunnel port is still used self.cleanup_tunnel_port(br, ofport, lvm.network_type) @log.log def fdb_update(self, context, fdb_entries): '''Call methods named '_fdb_'. This method assumes that methods '_fdb_' are defined in class. Currently the following actions are available. chg_ip ''' for action, values in fdb_entries.items(): method = '_fdb_' + action if not hasattr(self, method): raise NotImplementedError() getattr(self, method)(context, values) @log.log def fdb_chg_ip_tun(self, context, br, fdb_entries, local_ip, local_vlan_map): '''fdb update when an IP of a port is updated. The ML2 l2-pop mechanism driver sends an fdb update rpc message when an IP of a port is updated. :param context: RPC context. :param br: represent the bridge on which fdb_chg_ip_tun should be applied. :param fdb_entries: fdb dicts that contain all mac/IP information per agent and network. {'net1': {'agent_ip': {'before': [[mac, ip]], 'after': [[mac, ip]] } } 'net2': ... } :param local_ip: local IP address of this agent. :param local_vlan_map: A dict to map network_id to the corresponding lvm entry. ''' for network_id, agent_ports in fdb_entries.items(): lvm = local_vlan_map.get(network_id) if not lvm: continue for agent_ip, state in agent_ports.items(): if agent_ip == local_ip: continue after = state.get('after', []) for mac, ip in after: self.setup_entry_for_arp_reply(br, 'add', lvm.vlan, mac, ip) before = state.get('before', []) for mac, ip in before: self.setup_entry_for_arp_reply(br, 'remove', lvm.vlan, mac, ip)