197 lines
8.0 KiB
Python
197 lines
8.0 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron_lib import constants as n_const
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from os_ken.ofproto import ether
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from oslo_log import log
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from dragonflow.controller.apps import l3_base
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from dragonflow.controller.common import constants as const
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from dragonflow.controller import df_base_app
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LOG = log.getLogger(__name__)
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class L3ProactiveApp(df_base_app.DFlowApp, l3_base.L3AppMixin):
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def packet_in_handler(self, event):
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"""Handle packets sent to the controller from OVS """
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msg = event.msg
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self.router_function_packet_in_handler(msg)
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def _add_subnet_send_to_route(self, match, local_network_id, router_port):
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"""
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Add routing flows. i.e. for packets that are routed with this router
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(identified by parameter match), from the given network
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(local_network_id) and the router interface (router_port), transmit
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the packet to the next step in the pipeline. (Update network ID and
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L2 header).
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:param match: The match object for the packet
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:type match: OFPMatch
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:param local_network_id: The destination network ID
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:type local_network_id: Integer
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:param router_port: The router's egress router interface
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:type router_port: RouterInterface
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"""
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self._add_subnet_send_to_proactive_routing(match, local_network_id,
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router_port.mac)
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def _add_subnet_send_to_proactive_routing(self, match, dst_network_id,
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dst_router_port_mac):
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"""
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Add routing flows. i.e. for packets that are routed with this router
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(identified by parameter match), from the given network
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(local_network_id) and the router interface (router_port), transmit
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the packet to the next step in the pipeline. (Update network ID and
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L2 header).
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:param match: The match object for the packet
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:type match: OFPMatch
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:param dst_network_id: The destination network ID
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:type dst_network_id: Integer
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:param dst_router_port_mac: The router's egress router interface's MAC
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:type dst_router_port_mac: IPAddress.EUI (or representation)
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"""
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parser = self.parser
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ofproto = self.ofproto
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actions = []
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actions.append(parser.OFPActionDecNwTtl())
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actions.append(parser.OFPActionSetField(metadata=dst_network_id))
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actions.append(parser.OFPActionSetField(eth_src=dst_router_port_mac))
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action_inst = parser.OFPInstructionActions(
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ofproto.OFPIT_APPLY_ACTIONS, actions)
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goto_inst = parser.OFPInstructionGotoTable(
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const.L3_PROACTIVE_LOOKUP_TABLE)
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inst = [action_inst, goto_inst]
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self.mod_flow(
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inst=inst,
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table_id=const.L3_LOOKUP_TABLE,
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priority=const.PRIORITY_MEDIUM,
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match=match)
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def _add_port(self, lport):
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"""Add port which is not a router interface."""
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super(L3ProactiveApp, self)._add_port(lport)
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dst_mac = lport.mac
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network_key = lport.lswitch.unique_key
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port_key = lport.unique_key
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for dst_ip in lport.ips:
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self._add_forward_to_port_flow(dst_ip, dst_mac,
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network_key, port_key)
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for address_pair in lport.allowed_address_pairs:
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self._add_forward_to_port_flow(
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address_pair.ip_address,
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address_pair.mac_address,
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network_key,
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port_key,
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)
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def _add_forward_to_port_flow(self, dst_ip, dst_mac, network_id, port_key,
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priority=const.PRIORITY_HIGH):
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"""
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Add flows to update the packets L2 header and metadata (reg7/output
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register) for the given port, and forward the packet.
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Match by its IP and network.
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:param dst_ip: The IP of the port
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:type dst_ip: netaddr.IPAddress (or representation)
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:param dst_mac: The MAC of the port
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:type dst_mac: netaddr.EUI (or representation)
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:param network_id: The unique key of the network
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:type network_id: Integer
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:param port_key: The unique key of the port
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:type port_id: Integer
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:param priority: The priority of the flow
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:type priority: Integer
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"""
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parser = self.parser
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ofproto = self.ofproto
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if dst_ip.version == n_const.IP_VERSION_4:
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match = parser.OFPMatch(eth_type=ether.ETH_TYPE_IP,
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metadata=network_id,
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ipv4_dst=dst_ip)
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else:
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match = parser.OFPMatch(eth_type=ether.ETH_TYPE_IPV6,
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metadata=network_id,
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ipv6_dst=dst_ip)
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actions = []
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actions.append(parser.OFPActionSetField(eth_dst=dst_mac))
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actions.append(parser.OFPActionSetField(reg7=port_key))
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action_inst = parser.OFPInstructionActions(
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ofproto.OFPIT_APPLY_ACTIONS, actions)
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goto_inst = parser.OFPInstructionGotoTable(const.EGRESS_TABLE)
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inst = [action_inst, goto_inst]
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self.mod_flow(
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inst=inst,
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table_id=const.L3_PROACTIVE_LOOKUP_TABLE,
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priority=const.PRIORITY_HIGH,
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match=match)
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def _remove_port(self, lport):
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"""Remove port which is not a router interface."""
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super(L3ProactiveApp, self)._remove_port(lport)
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network_key = lport.lswitch.unique_key
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for dst_ip in lport.ips:
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self._remove_forward_to_port_flow(dst_ip, network_key)
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for address_pair in lport.allowed_address_pairs:
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self._remove_forward_to_port_flow(address_pair.ip_address,
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network_key)
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def _remove_forward_to_port_flow(self, dst_ip, network_id,
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priority=const.PRIORITY_HIGH):
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"""
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Remove the flows (added in #_add_forward_to_port_flow) which update
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the packets L2 header and metadata for a given port and forwards the
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packet.
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:param dst_ip: The IP of the port
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:type dst_ip: netaddr.IPAddress (or representation)
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:param network_id: The unique key of the network
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:type network_id: Integer
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:param priority: The priority of the flow
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:type priority: Integer
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"""
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parser = self.parser
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ofproto = self.ofproto
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if dst_ip.version == n_const.IP_VERSION_4:
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match = parser.OFPMatch(eth_type=ether.ETH_TYPE_IP,
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metadata=network_id,
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ipv4_dst=dst_ip)
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else:
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match = parser.OFPMatch(eth_type=ether.ETH_TYPE_IPV6,
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metadata=network_id,
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ipv6_dst=dst_ip)
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self.mod_flow(
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table_id=const.L3_PROACTIVE_LOOKUP_TABLE,
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command=ofproto.OFPFC_DELETE,
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priority=const.PRIORITY_HIGH,
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match=match)
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def _update_port(self, lport, orig_lport):
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"""Update port which is not a router interface."""
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if (
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set(lport.ips) != set(orig_lport.ips) or
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lport.mac != orig_lport.mac or
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lport.allowed_address_pairs != orig_lport.allowed_address_pairs
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):
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self._remove_port(orig_lport)
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self._add_port(lport)
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