OpenStack Networking (Neutron)
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#!/usr/bin/env python
# Copyright 2012 Cisco Systems, Inc.
# 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.
#
#
# Performs per host Linux Bridge configuration for Neutron.
# Based on the structure of the OpenVSwitch agent in the
# Neutron OpenVSwitch Plugin.
import sys
import netaddr
from neutron_lib.agent import topics
from neutron_lib import constants
from neutron_lib import exceptions
from neutron_lib.plugins import utils as plugin_utils
from neutron_lib.utils import helpers
from oslo_config import cfg
from oslo_log import log as logging
import oslo_messaging
from oslo_service import service
from oslo_utils import excutils
from neutron.agent.linux import bridge_lib
from neutron.agent.linux import ip_lib
from neutron.api.rpc.handlers import securitygroups_rpc as sg_rpc
from neutron.common import config as common_config
from neutron.common import profiler as setup_profiler
from neutron.common import utils
from neutron.conf.agent import common as agent_config
from neutron.conf import service as service_conf
from neutron.plugins.ml2.drivers.agent import _agent_manager_base as amb
from neutron.plugins.ml2.drivers.agent import _common_agent as ca
from neutron.plugins.ml2.drivers.agent import config as cagt_config # noqa
from neutron.plugins.ml2.drivers.l2pop.rpc_manager \
import l2population_rpc as l2pop_rpc
from neutron.plugins.ml2.drivers.linuxbridge.agent import arp_protect
from neutron.plugins.ml2.drivers.linuxbridge.agent.common import config # noqa
from neutron.plugins.ml2.drivers.linuxbridge.agent.common \
import constants as lconst
from neutron.plugins.ml2.drivers.linuxbridge.agent.common \
import utils as lb_utils
from neutron.plugins.ml2.drivers.linuxbridge.agent import \
linuxbridge_agent_extension_api as agent_extension_api
from neutron.plugins.ml2.drivers.linuxbridge.agent \
import linuxbridge_capabilities
LOG = logging.getLogger(__name__)
BRIDGE_NAME_PREFIX = "brq"
MAX_VLAN_POSTFIX_LEN = 5
VXLAN_INTERFACE_PREFIX = "vxlan-"
IPTABLES_DRIVERS = [
'iptables',
'iptables_hybrid',
'neutron.agent.linux.iptables_firewall.IptablesFirewallDriver',
'neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver'
]
class LinuxBridgeManager(amb.CommonAgentManagerBase):
def __init__(self, bridge_mappings, interface_mappings):
super(LinuxBridgeManager, self).__init__()
self.bridge_mappings = bridge_mappings
self.interface_mappings = interface_mappings
self.validate_interface_mappings()
self.validate_bridge_mappings()
self.ip = ip_lib.IPWrapper()
self.agent_api = None
# VXLAN related parameters:
self.local_ip = cfg.CONF.VXLAN.local_ip
self.vxlan_mode = lconst.VXLAN_NONE
if cfg.CONF.VXLAN.enable_vxlan:
device = self.get_local_ip_device()
self.validate_vxlan_group_with_local_ip()
self.local_int = device.name
self.check_vxlan_support()
def validate_interface_mappings(self):
for physnet, interface in self.interface_mappings.items():
if not ip_lib.device_exists(interface):
LOG.error("Interface %(intf)s for physical network %(net)s"
" does not exist. Agent terminated!",
{'intf': interface, 'net': physnet})
sys.exit(1)
def validate_bridge_mappings(self):
for physnet, bridge in self.bridge_mappings.items():
if not ip_lib.device_exists(bridge):
LOG.error("Bridge %(brq)s for physical network %(net)s"
" does not exist. Agent terminated!",
{'brq': bridge, 'net': physnet})
sys.exit(1)
def _is_valid_multicast_range(self, mrange):
try:
addr, vxlan_min, vxlan_max = mrange.split(':')
if int(vxlan_min) > int(vxlan_max):
raise ValueError()
try:
local_ver = netaddr.IPAddress(self.local_ip).version
n_addr = netaddr.IPAddress(addr)
if not n_addr.is_multicast() or n_addr.version != local_ver:
raise ValueError()
except netaddr.core.AddrFormatError:
raise ValueError()
except ValueError:
return False
return True
def validate_vxlan_group_with_local_ip(self):
for r in cfg.CONF.VXLAN.multicast_ranges:
if not self._is_valid_multicast_range(r):
LOG.error("Invalid multicast_range %(r)s. Must be in "
"<multicast address>:<vni_min>:<vni_max> format and "
"addresses must be in the same family as local IP "
"%(loc)s.", {'r': r, 'loc': self.local_ip})
sys.exit(1)
if not cfg.CONF.VXLAN.vxlan_group:
return
try:
ip_addr = netaddr.IPAddress(self.local_ip)
# Ensure the configured group address/range is valid and multicast
group_net = netaddr.IPNetwork(cfg.CONF.VXLAN.vxlan_group)
if not group_net.is_multicast():
raise ValueError()
if not ip_addr.version == group_net.version:
raise ValueError()
except (netaddr.core.AddrFormatError, ValueError):
LOG.error("Invalid VXLAN Group: %(group)s, must be an address "
"or network (in CIDR notation) in a multicast "
"range of the same address family as local_ip: "
"%(ip)s",
{'group': cfg.CONF.VXLAN.vxlan_group,
'ip': self.local_ip})
sys.exit(1)
def get_local_ip_device(self):
"""Return the device with local_ip on the host."""
device = self.ip.get_device_by_ip(self.local_ip)
if not device:
LOG.error("Tunneling cannot be enabled without the local_ip "
"bound to an interface on the host. Please "
"configure local_ip %s on the host interface to "
"be used for tunneling and restart the agent.",
self.local_ip)
sys.exit(1)
return device
@staticmethod
def get_bridge_name(network_id):
if not network_id:
LOG.warning("Invalid Network ID, will lead to incorrect "
"bridge name")
bridge_name = BRIDGE_NAME_PREFIX + \
network_id[:lconst.RESOURCE_ID_LENGTH]
return bridge_name
@staticmethod
def get_subinterface_name(physical_interface, vlan_id):
if not vlan_id:
LOG.warning("Invalid VLAN ID, will lead to incorrect "
"subinterface name")
vlan_postfix = '.%s' % vlan_id
# For the vlan subinterface name prefix we use:
# * the physical_interface, if len(physical_interface) +
# len(vlan_postifx) <= 15 for backward compatibility reasons
# Example: physical_interface = eth0
# prefix = eth0.1
# prefix = eth0.1111
#
# * otherwise a unique hash per physical_interface to help debugging
# Example: physical_interface = long_interface
# prefix = longHASHED.1
# prefix = longHASHED.1111
#
# Remark: For some physical_interface values, the used prefix can be
# both, the physical_interface itself or a hash, depending
# on the vlan_postfix length.
# Example: physical_interface = mix_interface
# prefix = mix_interface.1 (backward compatible)
# prefix = mix_iHASHED.1111
if (len(physical_interface) + len(vlan_postfix) >
constants.DEVICE_NAME_MAX_LEN):
physical_interface = plugin_utils.get_interface_name(
physical_interface, max_len=(constants.DEVICE_NAME_MAX_LEN -
MAX_VLAN_POSTFIX_LEN))
return "%s%s" % (physical_interface, vlan_postfix)
@staticmethod
def get_tap_device_name(interface_id):
return lb_utils.get_tap_device_name(interface_id)
@staticmethod
def get_vxlan_device_name(segmentation_id):
if 0 <= int(segmentation_id) <= constants.MAX_VXLAN_VNI:
return VXLAN_INTERFACE_PREFIX + str(segmentation_id)
else:
LOG.warning("Invalid Segmentation ID: %s, will lead to "
"incorrect vxlan device name", segmentation_id)
@staticmethod
def _match_multicast_range(segmentation_id):
for mrange in cfg.CONF.VXLAN.multicast_ranges:
addr, vxlan_min, vxlan_max = mrange.split(':')
if int(vxlan_min) <= segmentation_id <= int(vxlan_max):
return addr
def get_vxlan_group(self, segmentation_id):
mcast_addr = self._match_multicast_range(segmentation_id)
if mcast_addr:
net = netaddr.IPNetwork(mcast_addr)
else:
net = netaddr.IPNetwork(cfg.CONF.VXLAN.vxlan_group)
# Map the segmentation ID to (one of) the group address(es)
return str(net.network +
(int(segmentation_id) & int(net.hostmask)))
def get_deletable_bridges(self):
bridge_list = bridge_lib.get_bridge_names()
bridges = {b for b in bridge_list if b.startswith(BRIDGE_NAME_PREFIX)}
bridges.difference_update(self.bridge_mappings.values())
return bridges
@staticmethod
def get_tap_devices_count(bridge_name):
if_list = bridge_lib.BridgeDevice(bridge_name).get_interfaces()
return len([interface for interface in if_list if
interface.startswith(constants.TAP_DEVICE_PREFIX)])
def ensure_vlan_bridge(self, network_id, phy_bridge_name,
physical_interface, vlan_id):
"""Create a vlan and bridge unless they already exist."""
interface = self.ensure_vlan(physical_interface, vlan_id)
if phy_bridge_name:
return self.ensure_bridge(phy_bridge_name)
else:
bridge_name = self.get_bridge_name(network_id)
if self.ensure_bridge(bridge_name, interface):
return interface
def ensure_vxlan_bridge(self, network_id, segmentation_id, mtu):
"""Create a vxlan and bridge unless they already exist."""
interface = self.ensure_vxlan(segmentation_id, mtu)
if not interface:
LOG.error("Failed creating vxlan interface for "
"%(segmentation_id)s",
{'segmentation_id': segmentation_id})
return
bridge_name = self.get_bridge_name(network_id)
self.ensure_bridge(bridge_name, interface, update_interface=False)
return interface
def get_interface_details(self, interface, ip_version):
device = self.ip.device(interface)
ips = device.addr.list(scope='global',
ip_version=ip_version)
# Update default gateway if necessary
gateway = device.route.get_gateway(scope='global',
ip_version=ip_version)
return ips, gateway
def ensure_flat_bridge(self, network_id, phy_bridge_name,
physical_interface):
"""Create a non-vlan bridge unless it already exists."""
if phy_bridge_name:
return self.ensure_bridge(phy_bridge_name)
else:
bridge_name = self.get_bridge_name(network_id)
if self.ensure_bridge(bridge_name, physical_interface):
return physical_interface
def ensure_local_bridge(self, network_id, phy_bridge_name):
"""Create a local bridge unless it already exists."""
if phy_bridge_name:
bridge_name = phy_bridge_name
else:
bridge_name = self.get_bridge_name(network_id)
return self.ensure_bridge(bridge_name)
def ensure_vlan(self, physical_interface, vlan_id):
"""Create a vlan unless it already exists."""
interface = self.get_subinterface_name(physical_interface, vlan_id)
if not ip_lib.device_exists(interface):
LOG.debug("Creating subinterface %(interface)s for "
"VLAN %(vlan_id)s on interface "
"%(physical_interface)s",
{'interface': interface, 'vlan_id': vlan_id,
'physical_interface': physical_interface})
try:
int_vlan = self.ip.add_vlan(interface, physical_interface,
vlan_id)
except RuntimeError:
with excutils.save_and_reraise_exception() as ctxt:
if ip_lib.vlan_in_use(vlan_id):
ctxt.reraise = False
LOG.error("Unable to create VLAN interface for "
"VLAN ID %s because it is in use by "
"another interface.", vlan_id)
return
int_vlan.disable_ipv6()
int_vlan.link.set_up()
LOG.debug("Done creating subinterface %s", interface)
return interface
def ensure_vxlan(self, segmentation_id, mtu=None):
"""Create a vxlan unless it already exists."""
interface = self.get_vxlan_device_name(segmentation_id)
if not ip_lib.device_exists(interface):
LOG.debug("Creating vxlan interface %(interface)s for "
"VNI %(segmentation_id)s",
{'interface': interface,
'segmentation_id': segmentation_id})
args = {'dev': self.local_int,
'srcport': (cfg.CONF.VXLAN.udp_srcport_min,
cfg.CONF.VXLAN.udp_srcport_max),
'dstport': cfg.CONF.VXLAN.udp_dstport,
'ttl': cfg.CONF.VXLAN.ttl}
if cfg.CONF.VXLAN.tos:
args['tos'] = cfg.CONF.VXLAN.tos
if cfg.CONF.AGENT.dscp or cfg.CONF.AGENT.dscp_inherit:
LOG.warning('The deprecated tos option in group VXLAN '
'is set and takes precedence over dscp and '
'dscp_inherit in group AGENT.')
elif cfg.CONF.AGENT.dscp_inherit:
args['tos'] = 'inherit'
elif cfg.CONF.AGENT.dscp:
args['tos'] = int(cfg.CONF.AGENT.dscp) << 2
if self.vxlan_mode == lconst.VXLAN_MCAST:
args['group'] = self.get_vxlan_group(segmentation_id)
if cfg.CONF.VXLAN.l2_population:
args['proxy'] = cfg.CONF.VXLAN.arp_responder
# L2population should set the local ip address to handle
# a source dev with multiple ip addresses configured.
args['local'] = self.local_ip
try:
int_vxlan = self.ip.add_vxlan(interface, segmentation_id,
**args)
except RuntimeError:
with excutils.save_and_reraise_exception() as ctxt:
# perform this check after an attempt rather than before
# to avoid excessive lookups and a possible race condition.
if ip_lib.vxlan_in_use(segmentation_id):
ctxt.reraise = False
LOG.error("Unable to create VXLAN interface for "
"VNI %s because it is in use by another "
"interface.", segmentation_id)
return None
if mtu:
try:
int_vxlan.link.set_mtu(mtu)
except ip_lib.InvalidArgument:
phys_dev_mtu = ip_lib.get_device_mtu(self.local_int)
LOG.error("Provided MTU value %(mtu)s for VNI "
"%(segmentation_id)s is too high according "
"to physical device %(dev)s MTU=%(phys_mtu)s.",
{'mtu': mtu,
'segmentation_id': segmentation_id,
'dev': self.local_int,
'phys_mtu': phys_dev_mtu})
int_vxlan.link.delete()
return None
int_vxlan.disable_ipv6()
int_vxlan.link.set_up()
LOG.debug("Done creating vxlan interface %s", interface)
return interface
def _update_interface_ip_details(self, destination, source, ips, gateway):
dst_device = self.ip.device(destination)
src_device = self.ip.device(source)
# Append IP's to bridge if necessary
if ips:
for ip in ips:
# If bridge ip address already exists, then don't add
# otherwise will report error
to = utils.cidr_to_ip(ip['cidr'])
if not dst_device.addr.list(to=to):
dst_device.addr.add(cidr=ip['cidr'])
if gateway:
# Ensure that the gateway can be updated by changing the metric
metric = 100
ip_version = utils.get_ip_version(gateway['cidr'])
if gateway['metric'] != ip_lib.IP_ROUTE_METRIC_DEFAULT[ip_version]:
metric = gateway['metric'] - 1
dst_device.route.add_gateway(gateway=gateway['via'],
metric=metric)
src_device.route.delete_gateway(gateway=gateway['via'])
# Remove IP's from interface
if ips:
for ip in ips:
src_device.addr.delete(cidr=ip['cidr'])
def update_interface_ip_details(self, destination, source):
# Returns True if there were IPs or a gateway moved
updated = False
for ip_version in (constants.IP_VERSION_4, constants.IP_VERSION_6):
ips, gateway = self.get_interface_details(source, ip_version)
if ips or gateway:
self._update_interface_ip_details(destination, source, ips,
gateway)
updated = True
return updated
def ensure_bridge(self, bridge_name, interface=None,
update_interface=True):
"""Create a bridge unless it already exists."""
# ensure_device_is_ready instead of device_exists is used here
# because there are cases where the bridge exists but it's not UP,
# for example:
# 1) A greenthread was executing this function and had not yet executed
# "ip link set bridge_name up" before eventlet switched to this
# thread running the same function
# 2) The Nova VIF driver was running concurrently and had just created
# the bridge, but had not yet put it UP
if not ip_lib.ensure_device_is_ready(bridge_name):
LOG.debug("Starting bridge %(bridge_name)s for subinterface "
"%(interface)s",
{'bridge_name': bridge_name, 'interface': interface})
bridge_device = bridge_lib.BridgeDevice.addbr(bridge_name)
if bridge_device.setfd(0):
return
if bridge_device.disable_stp():
return
if bridge_device.link.set_up():
return
LOG.debug("Done starting bridge %(bridge_name)s for "
"subinterface %(interface)s",
{'bridge_name': bridge_name, 'interface': interface})
else:
bridge_device = bridge_lib.BridgeDevice(bridge_name)
if not interface:
return bridge_name
# Update IP info if necessary
if update_interface:
self.update_interface_ip_details(bridge_name, interface)
# Check if the interface is part of the bridge
if not bridge_device.owns_interface(interface):
try:
# Check if the interface is attached to another bridge
bridge = bridge_lib.BridgeDevice.get_interface_bridge(
interface)
if bridge:
bridge.delif(interface)
bridge_device.addif(interface)
except Exception as e:
LOG.error("Unable to add %(interface)s to %(bridge_name)s"
"! Exception: %(e)s",
{'interface': interface, 'bridge_name': bridge_name,
'e': e})
return
return bridge_name
def ensure_physical_in_bridge(self, network_id,
network_type,
physical_network,
segmentation_id,
mtu):
if network_type == constants.TYPE_VXLAN:
if self.vxlan_mode == lconst.VXLAN_NONE:
LOG.error("Unable to add vxlan interface for network %s",
network_id)
return
return self.ensure_vxlan_bridge(network_id, segmentation_id, mtu)
# NOTE(nick-ma-z): Obtain mappings of physical bridge and interfaces
physical_bridge = self.bridge_mappings.get(physical_network)
physical_interface = self.interface_mappings.get(physical_network)
if not physical_bridge and not physical_interface:
LOG.error("No bridge or interface mappings"
" for physical network %s",
physical_network)
return
if network_type == constants.TYPE_FLAT:
return self.ensure_flat_bridge(network_id, physical_bridge,
physical_interface)
elif network_type == constants.TYPE_VLAN:
return self.ensure_vlan_bridge(network_id, physical_bridge,
physical_interface,
segmentation_id)
else:
LOG.error("Unknown network_type %(network_type)s for network "
"%(network_id)s.", {network_type: network_type,
network_id: network_id})
def add_tap_interface(self, network_id, network_type, physical_network,
segmentation_id, tap_device_name, device_owner, mtu):
"""Add tap interface and handle interface missing exceptions."""
try:
return self._add_tap_interface(network_id, network_type,
physical_network, segmentation_id,
tap_device_name, device_owner, mtu)
except Exception:
with excutils.save_and_reraise_exception() as ctx:
if not ip_lib.device_exists(tap_device_name):
# the exception was likely a side effect of the tap device
# being removed during handling so we just return false
# like we would if it didn't exist to begin with.
ctx.reraise = False
return False
def _add_tap_interface(self, network_id,
network_type, physical_network, segmentation_id,
tap_device_name, device_owner, mtu):
"""Add tap interface.
If a VIF has been plugged into a network, this function will
add the corresponding tap device to the relevant bridge.
"""
if not ip_lib.device_exists(tap_device_name):
LOG.debug("Tap device: %s does not exist on "
"this host, skipped", tap_device_name)
return False
bridge_name = self.bridge_mappings.get(physical_network)
if not bridge_name:
bridge_name = self.get_bridge_name(network_id)
if network_type == constants.TYPE_LOCAL:
self.ensure_local_bridge(network_id, bridge_name)
elif not self.ensure_physical_in_bridge(network_id,
network_type,
physical_network,
segmentation_id,
mtu):
return False
if mtu: # <-None with device_details from older neutron servers.
# we ensure the MTU here because libvirt does not set the
# MTU of a bridge it creates and the tap device it creates will
# inherit from the bridge its plugged into, which will be 1500
# at the time. See bug/1684326 for details.
self._set_tap_mtu(tap_device_name, mtu)
# Avoid messing with plugging devices into a bridge that the agent
# does not own
if not device_owner.startswith(constants.DEVICE_OWNER_COMPUTE_PREFIX):
# Check if device needs to be added to bridge
if not bridge_lib.BridgeDevice.get_interface_bridge(
tap_device_name):
data = {'tap_device_name': tap_device_name,
'bridge_name': bridge_name}
LOG.debug("Adding device %(tap_device_name)s to bridge "
"%(bridge_name)s", data)
if bridge_lib.BridgeDevice(bridge_name).addif(tap_device_name):
return False
else:
data = {'tap_device_name': tap_device_name,
'device_owner': device_owner,
'bridge_name': bridge_name}
LOG.debug("Skip adding device %(tap_device_name)s to "
"%(bridge_name)s. It is owned by %(device_owner)s and "
"thus added elsewhere.", data)
return True
@staticmethod
def _set_tap_mtu(tap_device_name, mtu):
ip_lib.IPDevice(tap_device_name).link.set_mtu(mtu)
def plug_interface(self, network_id, network_segment, tap_name,
device_owner):
return self.add_tap_interface(network_id, network_segment.network_type,
network_segment.physical_network,
network_segment.segmentation_id,
tap_name, device_owner,
network_segment.mtu)
def delete_bridge(self, bridge_name):
bridge_device = bridge_lib.BridgeDevice(bridge_name)
if bridge_device.exists():
physical_interfaces = set(self.interface_mappings.values())
interfaces_on_bridge = bridge_device.get_interfaces()
for interface in interfaces_on_bridge:
self.remove_interface(bridge_name, interface)
if interface.startswith(VXLAN_INTERFACE_PREFIX):
self.delete_interface(interface)
else:
# Match the vlan/flat interface in the bridge.
# If the bridge has an IP, it mean that this IP was moved
# from the current interface, which also mean that this
# interface was not created by the agent.
updated = self.update_interface_ip_details(interface,
bridge_name)
if not updated and interface not in physical_interfaces:
self.delete_interface(interface)
try:
LOG.debug("Deleting bridge %s", bridge_name)
if bridge_device.link.set_down():
return
if bridge_device.delbr():
return
LOG.debug("Done deleting bridge %s", bridge_name)
except RuntimeError:
with excutils.save_and_reraise_exception() as ctxt:
if not bridge_device.exists():
# the exception was likely a side effect of the bridge
# being removed by nova during handling,
# so we just return
ctxt.reraise = False
LOG.debug("Cannot delete bridge %s; it does not exist",
bridge_name)
return
else:
LOG.debug("Cannot delete bridge %s; it does not exist",
bridge_name)
@staticmethod
def remove_interface(bridge_name, interface_name):
bridge_device = bridge_lib.BridgeDevice(bridge_name)
if bridge_device.exists():
if not bridge_device.owns_interface(interface_name):
return True
LOG.debug("Removing device %(interface_name)s from bridge "
"%(bridge_name)s",
{'interface_name': interface_name,
'bridge_name': bridge_name})
try:
bridge_device.delif(interface_name)
LOG.debug("Done removing device %(interface_name)s from "
"bridge %(bridge_name)s",
{'interface_name': interface_name,
'bridge_name': bridge_name})
return True
except RuntimeError:
with excutils.save_and_reraise_exception() as ctxt:
if not bridge_device.owns_interface(interface_name):
# the exception was likely a side effect of the tap
# being deleted by some other agent during handling
ctxt.reraise = False
LOG.debug("Cannot remove %(interface_name)s from "
"%(bridge_name)s. It is not on the bridge.",
{'interface_name': interface_name,
'bridge_name': bridge_name})
return False
else:
LOG.debug("Cannot remove device %(interface_name)s bridge "
"%(bridge_name)s does not exist",
{'interface_name': interface_name,
'bridge_name': bridge_name})
return False
def delete_interface(self, interface):
device = self.ip.device(interface)
if device.exists():
LOG.debug("Deleting interface %s",
interface)
device.link.set_down()
device.link.delete()
LOG.debug("Done deleting interface %s", interface)
def get_devices_modified_timestamps(self, devices):
# NOTE(kevinbenton): we aren't returning real timestamps here. We
# are returning interface indexes instead which change when the
# interface is removed/re-added. This works for the direct
# comparison the common agent loop performs with these.
# See bug/1622833 for details.
return {d: bridge_lib.get_interface_ifindex(d) for d in devices}
@staticmethod
def get_all_devices():
devices = set()
for device in bridge_lib.get_bridge_names():
if device.startswith(constants.TAP_DEVICE_PREFIX):
devices.add(device)
return devices
def vxlan_ucast_supported(self):
if not cfg.CONF.VXLAN.l2_population:
return False
if not ip_lib.iproute_arg_supported(
['bridge', 'fdb'], 'append'):
LOG.warning('Option "%(option)s" must be supported by command '
'"%(command)s" to enable %(mode)s mode',
{'option': 'append',
'command': 'bridge fdb',
'mode': 'VXLAN UCAST'})
return False
test_iface = None
for seg_id in range(1, constants.MAX_VXLAN_VNI + 1):
if (ip_lib.device_exists(self.get_vxlan_device_name(seg_id)) or
ip_lib.vxlan_in_use(seg_id)):
continue
test_iface = self.ensure_vxlan(seg_id)
break
else:
LOG.error('No valid Segmentation ID to perform UCAST test.')
return False
try:
bridge_lib.FdbInterface.append(constants.FLOODING_ENTRY[0],
test_iface, '1.1.1.1',
log_fail_as_error=False)
return True
except RuntimeError:
return False
finally:
self.delete_interface(test_iface)
@staticmethod
def vxlan_mcast_supported():
if not cfg.CONF.VXLAN.vxlan_group:
LOG.warning('VXLAN muticast group(s) must be provided in '
'vxlan_group option to enable VXLAN MCAST mode')
return False
if not ip_lib.iproute_arg_supported(
['ip', 'link', 'add', 'type', 'vxlan'],
'proxy'):
LOG.warning('Option "%(option)s" must be supported by command '
'"%(command)s" to enable %(mode)s mode',
{'option': 'proxy',
'command': 'ip link add type vxlan',
'mode': 'VXLAN MCAST'})
return False
return True
def check_vxlan_support(self):
self.vxlan_mode = lconst.VXLAN_NONE
if self.vxlan_ucast_supported():
self.vxlan_mode = lconst.VXLAN_UCAST
elif self.vxlan_mcast_supported():
self.vxlan_mode = lconst.VXLAN_MCAST
else:
raise exceptions.VxlanNetworkUnsupported()
LOG.debug('Using %s VXLAN mode', self.vxlan_mode)
@staticmethod
def fdb_ip_entry_exists(mac, ip, interface):
ip_version = utils.get_ip_version(ip)
entry = ip_lib.dump_neigh_entries(ip_version, interface, dst=ip,
lladdr=mac)
return entry != []
@staticmethod
def fdb_bridge_entry_exists(mac, interface, agent_ip=None):
entries = bridge_lib.FdbInterface.show(interface)
if not agent_ip:
return mac in entries
return (agent_ip in entries and mac in entries)
@staticmethod
def add_fdb_ip_entry(mac, ip, interface):
if cfg.CONF.VXLAN.arp_responder:
ip_lib.add_neigh_entry(ip, mac, interface)
@staticmethod
def remove_fdb_ip_entry(mac, ip, interface):
if cfg.CONF.VXLAN.arp_responder:
ip_lib.delete_neigh_entry(ip, mac, interface)
def add_fdb_entries(self, agent_ip, ports, interface):
for mac, ip in ports:
if mac != constants.FLOODING_ENTRY[0]:
self.add_fdb_ip_entry(mac, ip, interface)
bridge_lib.FdbInterface.replace(mac, interface, agent_ip,
check_exit_code=False)
elif self.vxlan_mode == lconst.VXLAN_UCAST:
if self.fdb_bridge_entry_exists(mac, interface):
bridge_lib.FdbInterface.append(mac, interface, agent_ip,
check_exit_code=False)
else:
bridge_lib.FdbInterface.add(mac, interface, agent_ip,
check_exit_code=False)
def remove_fdb_entries(self, agent_ip, ports, interface):
for mac, ip in ports:
if mac != constants.FLOODING_ENTRY[0]:
self.remove_fdb_ip_entry(mac, ip, interface)
bridge_lib.FdbInterface.delete(mac, interface, agent_ip,
check_exit_code=False)
elif self.vxlan_mode == lconst.VXLAN_UCAST:
bridge_lib.FdbInterface.delete(mac, interface, agent_ip,
check_exit_code=False)
def get_agent_id(self):
if self.bridge_mappings:
mac = ip_lib.get_device_mac(
list(self.bridge_mappings.values())[0])
else:
devices = self.ip.get_devices(True)
for device in devices:
mac = ip_lib.get_device_mac(device.name)
if mac:
break
else:
LOG.error("Unable to obtain MAC address for unique ID. "
"Agent terminated!")
sys.exit(1)
return 'lb%s' % mac.replace(":", "")
def get_agent_configurations(self):
configurations = {'bridge_mappings': self.bridge_mappings,
'interface_mappings': self.interface_mappings
}
if self.vxlan_mode != lconst.VXLAN_NONE:
configurations['tunneling_ip'] = self.local_ip
configurations['tunnel_types'] = [constants.TYPE_VXLAN]
configurations['l2_population'] = cfg.CONF.VXLAN.l2_population
return configurations
def get_rpc_callbacks(self, context, agent, sg_agent):
return LinuxBridgeRpcCallbacks(context, agent, sg_agent)
def get_agent_api(self, **kwargs):
if self.agent_api:
return self.agent_api
sg_agent = kwargs.get("sg_agent")
iptables_manager = self._get_iptables_manager(sg_agent)
self.agent_api = agent_extension_api.LinuxbridgeAgentExtensionAPI(
iptables_manager)
return self.agent_api
@staticmethod
def _get_iptables_manager(sg_agent):
if not sg_agent:
return None
if cfg.CONF.SECURITYGROUP.firewall_driver in IPTABLES_DRIVERS:
return sg_agent.firewall.iptables
def get_rpc_consumers(self):
consumers = [[topics.PORT, topics.UPDATE],
[topics.NETWORK, topics.DELETE],
[topics.NETWORK, topics.UPDATE],
[topics.SECURITY_GROUP, topics.UPDATE],
[topics.PORT_BINDING, topics.DEACTIVATE],
[topics.PORT_BINDING, topics.ACTIVATE]]
if cfg.CONF.VXLAN.l2_population:
consumers.append([topics.L2POPULATION, topics.UPDATE])
return consumers
def ensure_port_admin_state(self, tap_name, admin_state_up):
LOG.debug("Setting admin_state_up to %s for device %s",
admin_state_up, tap_name)
if admin_state_up:
ip_lib.IPDevice(tap_name).link.set_up()
else:
ip_lib.IPDevice(tap_name).link.set_down()
def setup_arp_spoofing_protection(self, device, device_details):
arp_protect.setup_arp_spoofing_protection(device, device_details)
def delete_arp_spoofing_protection(self, devices):
arp_protect.delete_arp_spoofing_protection(devices)
def delete_unreferenced_arp_protection(self, current_devices):
arp_protect.delete_unreferenced_arp_protection(current_devices)
def get_extension_driver_type(self):
return lconst.EXTENSION_DRIVER_TYPE
class LinuxBridgeRpcCallbacks(sg_rpc.SecurityGroupAgentRpcCallbackMixin,
l2pop_rpc.L2populationRpcCallBackMixin,
amb.CommonAgentManagerRpcCallBackBase):
# Set RPC API version to 1.0 by default.
# history
# 1.1 Support Security Group RPC
# 1.3 Added param devices_to_update to security_groups_provider_updated
# 1.4 Added support for network_update
# 1.5 Added binding_activate and binding_deactivate
target = oslo_messaging.Target(version='1.5')
def network_delete(self, context, **kwargs):
LOG.debug("network_delete received")
network_id = kwargs.get('network_id')
# NOTE(nick-ma-z): Don't remove pre-existing user-defined bridges
if network_id in self.network_map:
phynet = self.network_map[network_id].physical_network
if phynet and phynet in self.agent.mgr.bridge_mappings:
LOG.info("Physical network %s is defined in "
"bridge_mappings and cannot be deleted.",
network_id)
return
bridge_name = self.agent.mgr.get_bridge_name(network_id)
LOG.debug("Delete %s", bridge_name)
self.agent.mgr.delete_bridge(bridge_name)
self.network_map.pop(network_id, None)
def port_update(self, context, **kwargs):
port_id = kwargs['port']['id']
device_name = self.agent.mgr.get_tap_device_name(port_id)
# Put the device name in the updated_devices set.
# Do not store port details, as if they're used for processing
# notifications there is no guarantee the notifications are
# processed in the same order as the relevant API requests.
self.updated_devices.add(device_name)
LOG.debug("port_update RPC received for port: %s", port_id)
def binding_deactivate(self, context, **kwargs):
if kwargs.get('host') != cfg.CONF.host:
return
interface_name = self.agent.mgr.get_tap_device_name(
kwargs.get('port_id'))
bridge_name = self.agent.mgr.get_bridge_name(kwargs.get('network_id'))
LOG.debug("Removing device %(interface_name)s from bridge "
"%(bridge_name)s due to binding being de-activated",
{'interface_name': interface_name,
'bridge_name': bridge_name})
self.agent.mgr.remove_interface(bridge_name, interface_name)
def binding_activate(self, context, **kwargs):
if kwargs.get('host') != cfg.CONF.host:
return
# Since the common agent loop treats added and updated the same way,
# just add activated ports to the updated devices list. This way,
# adding binding activation is less disruptive to the existing code
port_id = kwargs.get('port_id')
device_name = self.agent.mgr.get_tap_device_name(port_id)
self.updated_devices.add(device_name)
LOG.debug("Binding activation received for port: %s", port_id)
def network_update(self, context, **kwargs):
network_id = kwargs['network']['id']
LOG.debug("network_update message processed for network "
"%(network_id)s, with ports: %(ports)s",
{'network_id': network_id,
'ports': self.agent.network_ports[network_id]})
for port_data in self.agent.network_ports[network_id]:
self.updated_devices.add(port_data['device'])
def fdb_add(self, context, fdb_entries):
LOG.debug("fdb_add received")
for network_id, values in fdb_entries.items():
segment = self.network_map.get(network_id)
if not segment:
return
if segment.network_type != constants.TYPE_VXLAN:
return
interface = self.agent.mgr.get_vxlan_device_name(
segment.segmentation_id)
agent_ports = values.get('ports')
for agent_ip, ports in agent_ports.items():
if agent_ip == self.agent.mgr.local_ip:
continue
self.agent.mgr.add_fdb_entries(agent_ip,
ports,
interface)
def fdb_remove(self, context, fdb_entries):
LOG.debug("fdb_remove received")
for network_id, values in fdb_entries.items():
segment = self.network_map.get(network_id)
if not segment:
return
if segment.network_type != constants.TYPE_VXLAN:
return
interface = self.agent.mgr.get_vxlan_device_name(
segment.segmentation_id)
agent_ports = values.get('ports')
for agent_ip, ports in agent_ports.items():
if agent_ip == self.agent.mgr.local_ip:
continue
self.agent.mgr.remove_fdb_entries(agent_ip,
ports,
interface)
def _fdb_chg_ip(self, context, fdb_entries):
LOG.debug("update chg_ip received")
for network_id, agent_ports in fdb_entries.items():
segment = self.network_map.get(network_id)
if not segment:
return
if segment.network_type != constants.TYPE_VXLAN:
return
interface = self.agent.mgr.get_vxlan_device_name(
segment.segmentation_id)
for agent_ip, state in agent_ports.items():
if agent_ip == self.agent.mgr.local_ip:
continue
after = state.get('after', [])
for mac, ip in after:
self.agent.mgr.add_fdb_ip_entry(mac, ip, interface)
before = state.get('before', [])
for mac, ip in before:
self.agent.mgr.remove_fdb_ip_entry(mac, ip, interface)
def fdb_update(self, context, fdb_entries):
LOG.debug("fdb_update received")
for action, values in fdb_entries.items():
method = '_fdb_' + action
if not hasattr(self, method):
raise NotImplementedError()
getattr(self, method)(context, values)
def main():
common_config.init(sys.argv[1:])
common_config.setup_logging()
agent_config.setup_privsep()
service_conf.register_service_opts(service_conf.RPC_EXTRA_OPTS, cfg.CONF)
try:
interface_mappings = helpers.parse_mappings(
cfg.CONF.LINUX_BRIDGE.physical_interface_mappings)
except ValueError as e:
LOG.error("Parsing physical_interface_mappings failed: %s. "
"Agent terminated!", e)
sys.exit(1)
LOG.info("Interface mappings: %s", interface_mappings)
try:
bridge_mappings = helpers.parse_mappings(
cfg.CONF.LINUX_BRIDGE.bridge_mappings)
except ValueError as e:
LOG.error("Parsing bridge_mappings failed: %s. "
"Agent terminated!", e)
sys.exit(1)
LOG.info("Bridge mappings: %s", bridge_mappings)
manager = LinuxBridgeManager(bridge_mappings, interface_mappings)
linuxbridge_capabilities.register()
polling_interval = cfg.CONF.AGENT.polling_interval
quitting_rpc_timeout = cfg.CONF.AGENT.quitting_rpc_timeout
agent = ca.CommonAgentLoop(manager, polling_interval, quitting_rpc_timeout,
constants.AGENT_TYPE_LINUXBRIDGE,
constants.AGENT_PROCESS_LINUXBRIDGE)
setup_profiler.setup(constants.AGENT_PROCESS_LINUXBRIDGE, cfg.CONF.host)
LOG.info("Agent initialized successfully, now running... ")
launcher = service.launch(cfg.CONF, agent, restart_method='mutate')
launcher.wait()