457 lines
20 KiB
Python
457 lines
20 KiB
Python
# Copyright (C) 2014,2015 VA Linux Systems Japan K.K.
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# Copyright (C) 2014,2015 YAMAMOTO Takashi <yamamoto at valinux co jp>
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# All Rights Reserved.
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#
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# 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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"""
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* references
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** OVS agent https://wiki.openstack.org/wiki/Ovs-flow-logic
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"""
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import netaddr
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from neutron_lib import constants as lib_consts
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from os_ken.lib.packet import ether_types
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from os_ken.lib.packet import icmpv6
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from os_ken.lib.packet import in_proto
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from oslo_log import log as logging
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from neutron.plugins.ml2.drivers.openvswitch.agent.common import constants
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from neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native \
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import br_dvr_process
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from neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native \
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import ovs_bridge
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LOG = logging.getLogger(__name__)
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# TODO(liuyulong): move to neutron-lib.
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IPV4_NETWORK_BROADCAST = "255.255.255.255"
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# All_DHCP_Relay_Agents_and_Servers
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# [RFC8415] https://datatracker.ietf.org/doc/html/rfc8415
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IPV6_All_DHCP_RELAY_AGENYS_AND_SERVERS = "ff02::1:2"
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class OVSIntegrationBridge(ovs_bridge.OVSAgentBridge,
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br_dvr_process.OVSDVRInterfaceMixin):
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"""openvswitch agent br-int specific logic."""
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of_tables = constants.INT_BR_ALL_TABLES
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def setup_default_table(self, enable_openflow_dhcp=False,
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enable_dhcpv6=False):
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self.setup_canary_table()
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self.install_goto(dest_table_id=constants.TRANSIENT_TABLE)
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self.install_normal(table_id=constants.TRANSIENT_TABLE, priority=3)
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self.init_dhcp(enable_openflow_dhcp=enable_openflow_dhcp,
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enable_dhcpv6=enable_dhcpv6)
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self.install_drop(table_id=constants.ARP_SPOOF_TABLE)
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self.install_drop(table_id=constants.LOCAL_SWITCHING,
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priority=constants.OPENFLOW_MAX_PRIORITY,
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vlan_vid=constants.DEAD_VLAN_TAG)
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# When openflow firewall is not enabled, we use this table to
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# deal with all egress flow.
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self.install_normal(table_id=constants.TRANSIENT_EGRESS_TABLE,
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priority=3)
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def init_dhcp(self, enable_openflow_dhcp=False, enable_dhcpv6=False):
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if not enable_openflow_dhcp:
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return
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# DHCP IPv4
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self.install_goto(dest_table_id=constants.DHCP_IPV4_TABLE,
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table_id=constants.TRANSIENT_TABLE,
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priority=101,
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eth_type=ether_types.ETH_TYPE_IP,
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ip_proto=in_proto.IPPROTO_UDP,
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ipv4_dst=IPV4_NETWORK_BROADCAST,
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udp_src=lib_consts.DHCP_CLIENT_PORT,
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udp_dst=lib_consts.DHCP_RESPONSE_PORT)
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self.install_drop(table_id=constants.DHCP_IPV4_TABLE)
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if not enable_dhcpv6:
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return
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# DHCP IPv6
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self.install_goto(dest_table_id=constants.DHCP_IPV6_TABLE,
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table_id=constants.TRANSIENT_TABLE,
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priority=101,
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eth_type=ether_types.ETH_TYPE_IPV6,
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ip_proto=in_proto.IPPROTO_UDP,
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ipv6_dst=IPV6_All_DHCP_RELAY_AGENYS_AND_SERVERS,
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udp_src=lib_consts.DHCPV6_CLIENT_PORT,
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udp_dst=lib_consts.DHCPV6_RESPONSE_PORT)
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self.install_drop(table_id=constants.DHCP_IPV6_TABLE)
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def add_dhcp_ipv4_flow(self, port_id, ofport, port_mac):
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(_dp, ofp, ofpp) = self._get_dp()
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match = ofpp.OFPMatch(eth_type=ether_types.ETH_TYPE_IP,
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ip_proto=in_proto.IPPROTO_UDP,
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in_port=ofport,
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eth_src=port_mac,
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udp_src=68,
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udp_dst=67)
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actions = [
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ofpp.OFPActionOutput(ofp.OFPP_CONTROLLER, 0),
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]
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instructions = [
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ofpp.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions),
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]
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self.install_instructions(table_id=constants.DHCP_IPV4_TABLE,
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priority=100,
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instructions=instructions,
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match=match)
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def add_dhcp_ipv6_flow(self, port_id, ofport, port_mac):
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(_dp, ofp, ofpp) = self._get_dp()
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match = ofpp.OFPMatch(eth_type=ether_types.ETH_TYPE_IPV6,
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ip_proto=in_proto.IPPROTO_UDP,
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in_port=ofport,
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eth_src=port_mac,
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udp_src=546,
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udp_dst=547)
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actions = [
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ofpp.OFPActionOutput(ofp.OFPP_CONTROLLER, 0),
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]
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instructions = [
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ofpp.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions),
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]
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self.install_instructions(table_id=constants.DHCP_IPV6_TABLE,
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priority=100,
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instructions=instructions,
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match=match)
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def del_dhcp_flow(self, ofport, port_mac):
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self.uninstall_flows(table_id=constants.DHCP_IPV4_TABLE,
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eth_type=ether_types.ETH_TYPE_IP,
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ip_proto=in_proto.IPPROTO_UDP,
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in_port=ofport,
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eth_src=port_mac,
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udp_src=68,
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udp_dst=67)
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self.uninstall_flows(table_id=constants.DHCP_IPV6_TABLE,
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eth_type=ether_types.ETH_TYPE_IPV6,
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ip_proto=in_proto.IPPROTO_UDP,
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in_port=ofport,
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eth_src=port_mac,
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udp_src=546,
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udp_dst=547)
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def setup_canary_table(self):
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self.install_drop(constants.CANARY_TABLE)
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def check_canary_table(self):
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try:
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flows = self.dump_flows(constants.CANARY_TABLE)
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except RuntimeError:
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LOG.exception("Failed to communicate with the switch")
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return constants.OVS_DEAD
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return constants.OVS_NORMAL if flows else constants.OVS_RESTARTED
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@staticmethod
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def _local_vlan_match(_ofp, ofpp, port, vlan_vid):
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return ofpp.OFPMatch(in_port=port, vlan_vid=vlan_vid)
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def provision_local_vlan(self, port, lvid, segmentation_id):
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(_dp, ofp, ofpp) = self._get_dp()
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if segmentation_id is None:
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vlan_vid = ofp.OFPVID_NONE
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actions = [ofpp.OFPActionPushVlan()]
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else:
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vlan_vid = segmentation_id | ofp.OFPVID_PRESENT
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actions = []
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match = self._local_vlan_match(ofp, ofpp, port, vlan_vid)
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actions += [
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ofpp.OFPActionSetField(vlan_vid=lvid | ofp.OFPVID_PRESENT),
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]
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instructions = [
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ofpp.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions),
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ofpp.OFPInstructionGotoTable(table_id=constants.TRANSIENT_TABLE),
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]
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self.install_instructions(
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instructions=instructions,
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priority=3,
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match=match,
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)
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def reclaim_local_vlan(self, port, segmentation_id):
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(_dp, ofp, ofpp) = self._get_dp()
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if segmentation_id is None:
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vlan_vid = ofp.OFPVID_NONE
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else:
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vlan_vid = segmentation_id | ofp.OFPVID_PRESENT
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match = self._local_vlan_match(ofp, ofpp, port, vlan_vid)
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self.uninstall_flows(match=match)
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@staticmethod
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def _arp_dvr_dst_mac_match(ofp, ofpp, vlan, dvr_mac):
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# If eth_dst is equal to the dvr mac of this host, then
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# flag it as matched.
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if not vlan:
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return ofpp.OFPMatch(vlan_vid=ofp.OFPVID_NONE, eth_dst=dvr_mac)
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return ofpp.OFPMatch(vlan_vid=vlan | ofp.OFPVID_PRESENT,
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eth_dst=dvr_mac)
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@staticmethod
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def _dvr_dst_mac_table_id(network_type):
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if network_type in constants.DVR_PHYSICAL_NETWORK_TYPES:
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return constants.ARP_DVR_MAC_TO_DST_MAC_PHYSICAL
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else:
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return constants.ARP_DVR_MAC_TO_DST_MAC
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def install_dvr_dst_mac_for_arp(self, network_type,
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vlan_tag, gateway_mac, dvr_mac, rtr_port):
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table_id = self._dvr_dst_mac_table_id(network_type)
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# Match the destination MAC with the DVR MAC
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(_dp, ofp, ofpp) = self._get_dp()
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match = self._arp_dvr_dst_mac_match(ofp, ofpp, vlan_tag, dvr_mac)
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# Incoming packet will come with destination MAC of DVR host MAC from
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# the ARP Responder. The Source MAC in this case will have the source
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# MAC of the port MAC that responded from the ARP responder.
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# So just remove the DVR host MAC from the 'eth_dst' and replace it
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# with the gateway-mac. The packet should end up in the right the table
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# for the packet to reach the router interface.
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actions = [
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ofpp.OFPActionSetField(eth_dst=gateway_mac),
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ofpp.OFPActionPopVlan(),
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ofpp.OFPActionOutput(rtr_port, 0)
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]
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self.install_apply_actions(table_id=table_id,
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priority=5,
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match=match,
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actions=actions)
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@staticmethod
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def _dvr_to_src_mac_match(ofp, ofpp, vlan_tag, dst_mac):
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if not vlan_tag:
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# When the network is flat type, the vlan_tag will be None.
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return ofpp.OFPMatch(vlan_vid=ofp.OFPVID_NONE, eth_dst=dst_mac)
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return ofpp.OFPMatch(vlan_vid=vlan_tag | ofp.OFPVID_PRESENT,
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eth_dst=dst_mac)
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@staticmethod
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def _dvr_to_src_mac_table_id(network_type):
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if network_type in constants.DVR_PHYSICAL_NETWORK_TYPES:
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return constants.DVR_TO_SRC_MAC_PHYSICAL
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else:
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return constants.DVR_TO_SRC_MAC
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def install_dvr_to_src_mac(self, network_type,
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vlan_tag, gateway_mac, dst_mac, dst_port):
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table_id = self._dvr_to_src_mac_table_id(network_type)
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(_dp, ofp, ofpp) = self._get_dp()
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match = self._dvr_to_src_mac_match(ofp, ofpp,
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vlan_tag=vlan_tag, dst_mac=dst_mac)
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actions = [
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ofpp.OFPActionSetField(eth_src=gateway_mac),
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]
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instructions = [
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ofpp.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions),
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ofpp.OFPInstructionGotoTable(table_id=constants.TRANSIENT_TABLE),
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]
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self.install_instructions(table_id=table_id,
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priority=20,
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match=match,
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instructions=instructions)
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actions = []
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if vlan_tag:
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actions.append(ofpp.OFPActionPopVlan())
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actions.append(ofpp.OFPActionOutput(dst_port, 0))
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self.install_apply_actions(table_id=constants.TRANSIENT_TABLE,
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priority=20,
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match=match,
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actions=actions)
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def delete_dvr_to_src_mac(self, network_type, vlan_tag, dst_mac):
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table_id = self._dvr_to_src_mac_table_id(network_type)
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(_dp, ofp, ofpp) = self._get_dp()
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match = self._dvr_to_src_mac_match(ofp, ofpp,
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vlan_tag=vlan_tag, dst_mac=dst_mac)
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for table in (table_id, constants.TRANSIENT_TABLE):
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self.uninstall_flows(
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strict=True, priority=20, table_id=table, match=match)
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def add_dvr_mac_physical(self, mac, port):
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self.install_goto(table_id=constants.LOCAL_SWITCHING,
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priority=4,
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in_port=port,
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eth_src=mac,
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dest_table_id=constants.DVR_TO_SRC_MAC_PHYSICAL)
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def remove_dvr_mac_vlan(self, mac):
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# REVISIT(yamamoto): match in_port as well?
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self.uninstall_flows(table_id=constants.LOCAL_SWITCHING,
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eth_src=mac)
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def add_dvr_mac_tun(self, mac, port):
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self.install_goto(table_id=constants.LOCAL_SWITCHING,
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priority=2,
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in_port=port,
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eth_src=mac,
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dest_table_id=constants.DVR_TO_SRC_MAC)
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def remove_dvr_mac_tun(self, mac, port):
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self.uninstall_flows(table_id=constants.LOCAL_SWITCHING,
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in_port=port, eth_src=mac)
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def delete_dvr_dst_mac_for_arp(self, network_type,
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vlan_tag, gateway_mac, dvr_mac, rtr_port):
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table_id = self._dvr_to_src_mac_table_id(network_type)
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(_dp, ofp, ofpp) = self._get_dp()
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match = self._arp_dvr_dst_mac_match(ofp, ofpp, vlan_tag, dvr_mac)
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self.uninstall_flows(
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strict=True, priority=5, table_id=table_id, match=match)
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def add_dvr_gateway_mac_arp_vlan(self, mac, port):
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self.install_goto(
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table_id=constants.LOCAL_SWITCHING,
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priority=5,
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in_port=port,
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eth_dst=mac,
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dest_table_id=constants.ARP_DVR_MAC_TO_DST_MAC_PHYSICAL)
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def remove_dvr_gateway_mac_arp_vlan(self, mac, port):
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self.uninstall_flows(table_id=constants.LOCAL_SWITCHING,
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eth_dst=mac)
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def add_dvr_gateway_mac_arp_tun(self, mac, port):
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self.install_goto(table_id=constants.LOCAL_SWITCHING,
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priority=5,
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in_port=port,
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eth_dst=mac,
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dest_table_id=constants.ARP_DVR_MAC_TO_DST_MAC)
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def remove_dvr_gateway_mac_arp_tun(self, mac, port):
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self.uninstall_flows(table_id=constants.LOCAL_SWITCHING,
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eth_dst=mac)
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@staticmethod
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def _arp_reply_match(ofp, ofpp, port):
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return ofpp.OFPMatch(in_port=port,
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eth_type=ether_types.ETH_TYPE_ARP)
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@staticmethod
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def _icmpv6_reply_match(ofp, ofpp, port):
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return ofpp.OFPMatch(in_port=port,
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eth_type=ether_types.ETH_TYPE_IPV6,
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ip_proto=in_proto.IPPROTO_ICMPV6,
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icmpv6_type=icmpv6.ND_NEIGHBOR_ADVERT)
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def install_icmpv6_na_spoofing_protection(self, port, ip_addresses):
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# Allow neighbor advertisements as long as they match addresses
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# that actually belong to the port.
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for ip in ip_addresses:
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masked_ip = self._cidr_to_os_ken(ip)
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self.install_goto(
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table_id=constants.ARP_SPOOF_TABLE, priority=2,
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eth_type=ether_types.ETH_TYPE_IPV6,
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ip_proto=in_proto.IPPROTO_ICMPV6,
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icmpv6_type=icmpv6.ND_NEIGHBOR_ADVERT,
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ipv6_nd_target=masked_ip, in_port=port,
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dest_table_id=constants.TRANSIENT_TABLE)
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# Now that the rules are ready, direct icmpv6 neighbor advertisement
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# traffic from the port into the anti-spoof table.
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(_dp, ofp, ofpp) = self._get_dp()
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match = self._icmpv6_reply_match(ofp, ofpp, port=port)
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self.install_goto(table_id=constants.LOCAL_SWITCHING,
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priority=10,
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match=match,
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dest_table_id=constants.ARP_SPOOF_TABLE)
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def set_allowed_macs_for_port(self, port, mac_addresses=None,
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allow_all=False):
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if allow_all:
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self.uninstall_flows(table_id=constants.LOCAL_SWITCHING,
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in_port=port)
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self.uninstall_flows(table_id=constants.MAC_SPOOF_TABLE,
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in_port=port)
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return
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mac_addresses = mac_addresses or []
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for address in mac_addresses:
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self.install_goto(
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table_id=constants.MAC_SPOOF_TABLE, priority=2,
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eth_src=address, in_port=port,
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dest_table_id=constants.TRANSIENT_TABLE)
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# normalize so we can see if macs are the same
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mac_addresses = {netaddr.EUI(mac) for mac in mac_addresses}
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flows = self.dump_flows(constants.MAC_SPOOF_TABLE)
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for flow in flows:
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matches = dict(flow.match.items())
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if matches.get('in_port') != port:
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continue
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if not matches.get('eth_src'):
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continue
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flow_mac = matches['eth_src']
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if netaddr.EUI(flow_mac) not in mac_addresses:
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self.uninstall_flows(table_id=constants.MAC_SPOOF_TABLE,
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in_port=port, eth_src=flow_mac)
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self.install_goto(table_id=constants.LOCAL_SWITCHING,
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priority=9, in_port=port,
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dest_table_id=constants.MAC_SPOOF_TABLE)
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def install_arp_spoofing_protection(self, port, ip_addresses):
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# allow ARP replies as long as they match addresses that actually
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# belong to the port.
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for ip in ip_addresses:
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masked_ip = self._cidr_to_os_ken(ip)
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self.install_goto(table_id=constants.ARP_SPOOF_TABLE,
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priority=2,
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eth_type=ether_types.ETH_TYPE_ARP,
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arp_spa=masked_ip,
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in_port=port,
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dest_table_id=constants.MAC_SPOOF_TABLE)
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# Now that the rules are ready, direct ARP traffic from the port into
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# the anti-spoof table.
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# This strategy fails gracefully because OVS versions that can't match
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# on ARP headers will just process traffic normally.
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(_dp, ofp, ofpp) = self._get_dp()
|
|
match = self._arp_reply_match(ofp, ofpp, port=port)
|
|
self.install_goto(table_id=constants.LOCAL_SWITCHING,
|
|
priority=10,
|
|
match=match,
|
|
dest_table_id=constants.ARP_SPOOF_TABLE)
|
|
|
|
def delete_arp_spoofing_protection(self, port):
|
|
(_dp, ofp, ofpp) = self._get_dp()
|
|
match = self._arp_reply_match(ofp, ofpp, port=port)
|
|
self.uninstall_flows(table_id=constants.LOCAL_SWITCHING,
|
|
match=match)
|
|
match = self._icmpv6_reply_match(ofp, ofpp, port=port)
|
|
self.uninstall_flows(table_id=constants.LOCAL_SWITCHING,
|
|
match=match)
|
|
self.delete_arp_spoofing_allow_rules(port)
|
|
|
|
def delete_arp_spoofing_allow_rules(self, port):
|
|
self.uninstall_flows(table_id=constants.ARP_SPOOF_TABLE,
|
|
in_port=port)
|
|
|
|
def install_dscp_marking_rule(self, port, dscp_mark):
|
|
# reg2 is a metadata field that does not alter packets.
|
|
# By loading a value into this field and checking if the value is
|
|
# altered it allows the packet to be resubmitted and go through
|
|
# the flow table again to be identified by other flows.
|
|
(dp, ofp, ofpp) = self._get_dp()
|
|
actions = [ofpp.OFPActionSetField(reg2=1),
|
|
ofpp.OFPActionSetField(ip_dscp=dscp_mark),
|
|
ofpp.NXActionResubmit(in_port=port)]
|
|
instructions = [
|
|
ofpp.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions),
|
|
]
|
|
self.install_instructions(instructions, table_id=0,
|
|
priority=65535, in_port=port, reg2=0,
|
|
eth_type=0x0800)
|
|
self.install_instructions(instructions, table_id=0,
|
|
priority=65535, in_port=port, reg2=0,
|
|
eth_type=0x86DD)
|