OpenStack Networking (Neutron)
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# 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
# 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 collections
import inspect
import os
import re
import netaddr
from neutron_lib.api.definitions import availability_zone as az_def
from neutron_lib.api.definitions import external_net
from neutron_lib.api.definitions import extra_dhcp_opt as edo_ext
from neutron_lib.api.definitions import l3
from neutron_lib.api.definitions import port_security as psec
from neutron_lib.api.definitions import portbindings
from neutron_lib.api import validators
from neutron_lib import constants as const
from neutron_lib import context as n_context
from neutron_lib import exceptions as n_exc
from neutron_lib.plugins import directory
from neutron_lib.utils import net as n_utils
from oslo_config import cfg
from oslo_log import log
from oslo_utils import netutils
from oslo_utils import strutils
from ovs.db import idl
from ovsdbapp.backend.ovs_idl import connection
from ovsdbapp.backend.ovs_idl import idlutils
from ovsdbapp import constants as ovsdbapp_const
from neutron._i18n import _
from neutron.common.ovn import constants
from neutron.common.ovn import exceptions as ovn_exc
LOG = log.getLogger(__name__)
DNS_RESOLVER_FILE = "/etc/resolv.conf"
AddrPairsDiff = collections.namedtuple(
'AddrPairsDiff', ['added', 'removed', 'changed'])
PortExtraDHCPValidation = collections.namedtuple(
'PortExtraDHCPValidation', ['failed', 'invalid_ipv4', 'invalid_ipv6'])
def ovn_name(id):
# The name of the OVN entry will be neutron-<UUID>
# This is due to the fact that the OVN application checks if the name
# is a UUID. If so then there will be no matches.
# We prefix the UUID to enable us to use the Neutron UUID when
# updating, deleting etc.
return 'neutron-%s' % id
def ovn_lrouter_port_name(id):
# The name of the OVN lrouter port entry will be lrp-<UUID>
# This is to distinguish with the name of the connected lswitch patch port,
# which is named with neutron port uuid, so that OVS patch ports are
# generated properly. The pairing patch port names will be:
# - patch-lrp-<UUID>-to-<UUID>
# - patch-<UUID>-to-lrp-<UUID>
# lrp stands for Logical Router Port
return constants.LRP_PREFIX + '%s' % id
def ovn_cr_lrouter_port_name(_id):
# The name of the OVN chassisredirect lrouter port entry will be
# cr-lrp-<UUID>
return 'cr-lrp-%s' % _id
def ovn_provnet_port_name(network_id):
# The name of OVN lswitch provider network port entry will be
# provnet-<Network-UUID>. The port is created for network having
# provider:physical_network attribute.
return constants.OVN_PROVNET_PORT_NAME_PREFIX + '%s' % network_id
def ovn_vhu_sockpath(sock_dir, port_id):
# Frame the socket path of a virtio socket
return os.path.join(
# this parameter will become the virtio port name,
# so it should not exceed IFNAMSIZ(16).
(const.VHOST_USER_DEVICE_PREFIX + port_id)[:14])
def ovn_addrset_name(sg_id, ip_version):
# The name of the address set for the given security group id and ip
# version. The format is:
# as-<ip version>-<security group uuid>
# with all '-' replaced with '_'. This replacement is necessary
# because OVN doesn't support '-' in an address set name.
return ('as-%s-%s' % (ip_version, sg_id)).replace('-', '_')
def ovn_pg_addrset_name(sg_id, ip_version):
# The name of the address set for the given security group id modelled as a
# Port Group and ip version. The format is:
# pg-<security group uuid>-<ip version>
# with all '-' replaced with '_'. This replacement is necessary
# because OVN doesn't support '-' in an address set name.
return ('pg-%s-%s' % (sg_id, ip_version)).replace('-', '_')
def ovn_port_group_name(sg_id):
# The name of the port group for the given security group id.
# The format is: pg-<security group uuid>.
return ('pg-%s' % sg_id).replace('-', '_')
def is_network_device_port(port):
return port.get('device_owner', '').startswith(
def _is_dhcp_disabled(dhcp_opt):
return (dhcp_opt['opt_name'] == constants.DHCP_DISABLED_OPT and
dhcp_opt.get('opt_value', '').lower() == 'true')
def validate_port_extra_dhcp_opts(port):
"""Validate port's extra DHCP options.
:param port: A neutron port.
:returns: A PortExtraDHCPValidation object.
invalid = {const.IP_VERSION_4: [], const.IP_VERSION_6: []}
failed = False
for edo in port.get(edo_ext.EXTRADHCPOPTS, []):
ip_version = edo['ip_version']
opt_name = edo['opt_name']
# If DHCP is disabled for this port via this special option,
# always succeed the validation
if _is_dhcp_disabled(edo):
failed = False
if opt_name not in constants.SUPPORTED_DHCP_OPTS_MAPPING[ip_version]:
failed = True
return PortExtraDHCPValidation(
invalid_ipv4=invalid[const.IP_VERSION_4] if failed else [],
invalid_ipv6=invalid[const.IP_VERSION_6] if failed else [])
def get_lsp_dhcp_opts(port, ip_version):
# Get dhcp options from Neutron port, for setting DHCP_Options row
# in OVN.
lsp_dhcp_disabled = False
lsp_dhcp_opts = {}
if is_network_device_port(port):
lsp_dhcp_disabled = True
mapping = constants.SUPPORTED_DHCP_OPTS_MAPPING[ip_version]
for edo in port.get(edo_ext.EXTRADHCPOPTS, []):
if edo['ip_version'] != ip_version:
if _is_dhcp_disabled(edo):
# OVN native DHCP is disabled on this port
lsp_dhcp_disabled = True
# Make sure return value behavior not depends on the order and
# content of the extra DHCP options for the port
if edo['opt_name'] not in mapping:
LOG.warning('The DHCP option %(opt_name)s on port %(port)s '
'is not suppported by OVN, ignoring it',
{'opt_name': edo['opt_name'], 'port': port['id']})
opt = mapping[edo['opt_name']]
lsp_dhcp_opts[opt] = edo['opt_value']
return (lsp_dhcp_disabled, lsp_dhcp_opts)
def is_lsp_trusted(port):
return n_utils.is_port_trusted(port) if port.get('device_owner') else False
def is_lsp_ignored(port):
# Since the floating IP port is not bound to any chassis, packets from vm
# destined to floating IP will be dropped. To overcome this, we do not
# create/update floating IP port in OVN.
return port.get('device_owner') in [const.DEVICE_OWNER_FLOATINGIP]
def get_lsp_security_groups(port, skip_trusted_port=True):
# In other agent link OVS, skipping trusted port is processed in security
# groups RPC. We haven't that step, so we do it here.
return [] if (skip_trusted_port and is_lsp_trusted(port)
) else port.get('security_groups', [])
def is_snat_enabled(router):
return router.get(l3.EXTERNAL_GW_INFO, {}).get('enable_snat', True)
def is_port_security_enabled(port):
return port.get(psec.PORTSECURITY)
def is_security_groups_enabled(port):
return port.get(constants.PORT_SECURITYGROUPS)
def validate_and_get_data_from_binding_profile(port):
if (constants.OVN_PORT_BINDING_PROFILE not in port or
not validators.is_attr_set(
return {}
param_set = {}
param_dict = {}
for param_set in constants.OVN_PORT_BINDING_PROFILE_PARAMS:
param_keys = param_set.keys()
for param_key in param_keys:
param_dict[param_key] = (port[
except KeyError:
if len(param_dict) == 0:
if len(param_dict) != len(param_keys):
msg = _('Invalid binding:profile. %s are all '
'required.') % param_keys
raise n_exc.InvalidInput(error_message=msg)
if (len(port[constants.OVN_PORT_BINDING_PROFILE]) != len(
msg = _('Invalid binding:profile. too many parameters')
raise n_exc.InvalidInput(error_message=msg)
if not param_dict:
return {}
for param_key, param_type in param_set.items():
if param_type is None:
param_value = param_dict[param_key]
if not isinstance(param_value, param_type):
msg = _('Invalid binding:profile. %(key)s %(value)s '
'value invalid type') % {'key': param_key,
'value': param_value}
raise n_exc.InvalidInput(error_message=msg)
# Make sure we can successfully look up the port indicated by
# parent_name. Just let it raise the right exception if there is a
# problem.
if 'parent_name' in param_set:
plugin = directory.get_plugin()
if 'tag' in param_set:
tag = int(param_dict['tag'])
if tag < 0 or tag > 4095:
msg = _('Invalid binding:profile. tag "%s" must be '
'an integer between 0 and 4095, inclusive') % tag
raise n_exc.InvalidInput(error_message=msg)
return param_dict
def is_dhcp_options_ignored(subnet):
# Don't insert DHCP_Options entry for v6 subnet with 'SLAAC' as
# 'ipv6_address_mode', since DHCPv6 shouldn't work for this mode.
return (subnet['ip_version'] == const.IP_VERSION_6 and
subnet.get('ipv6_address_mode') == const.IPV6_SLAAC)
def get_ovn_ipv6_address_mode(address_mode):
return constants.OVN_IPV6_ADDRESS_MODES[address_mode]
def get_revision_number(resource, resource_type):
"""Get the resource's revision number based on its type."""
if resource_type in (constants.TYPE_NETWORKS,
constants.TYPE_FLOATINGIPS, constants.TYPE_SUBNETS):
return resource['revision_number']
raise ovn_exc.UnknownResourceType(resource_type=resource_type)
def remove_macs_from_lsp_addresses(addresses):
"""Remove the mac addreses from the Logical_Switch_Port addresses column.
:param addresses: The list of addresses from the Logical_Switch_Port.
Example: ["80:fa:5b:06:72:b7",
:returns: A list of IP addesses (v4 and v6)
ip_list = []
for addr in addresses:
ip_list.extend([x for x in addr.split() if
(netutils.is_valid_ipv4(x) or
return ip_list
def get_allowed_address_pairs_ip_addresses(port):
"""Return a list of IP addresses from port's allowed_address_pairs.
:param port: A neutron port
:returns: A list of IP addesses (v4 and v6)
return [x['ip_address'] for x in port.get('allowed_address_pairs', [])
if 'ip_address' in x]
def get_allowed_address_pairs_ip_addresses_from_ovn_port(ovn_port):
"""Return a list of IP addresses from ovn port.
Return a list of IP addresses equivalent of Neutron's port
allowed_address_pairs column using the data in the OVN port.
:param ovn_port: A OVN port
:returns: A list of IP addesses (v4 and v6)
addresses = remove_macs_from_lsp_addresses(ovn_port.addresses)
port_security = remove_macs_from_lsp_addresses(ovn_port.port_security)
return [x for x in port_security if x not in addresses]
def get_ovn_port_security_groups(ovn_port, skip_trusted_port=True):
info = {'security_groups': ovn_port.external_ids.get(
constants.OVN_SG_IDS_EXT_ID_KEY, '').split(),
'device_owner': ovn_port.external_ids.get(
return get_lsp_security_groups(info, skip_trusted_port=skip_trusted_port)
def get_ovn_port_addresses(ovn_port):
addresses = remove_macs_from_lsp_addresses(ovn_port.addresses)
port_security = remove_macs_from_lsp_addresses(ovn_port.port_security)
return list(set(addresses + port_security))
def sort_ips_by_version(addresses):
ip_map = {'ip4': [], 'ip6': []}
for addr in addresses:
ip_version = netaddr.IPNetwork(addr).version
ip_map['ip%d' % ip_version].append(addr)
return ip_map
def is_lsp_router_port(port):
return port.get('device_owner') in [const.DEVICE_OWNER_ROUTER_INTF,
def get_lrouter_ext_gw_static_route(ovn_router):
return [route for route in getattr(ovn_router, 'static_routes', []) if
route, 'external_ids', {}).get(
constants.OVN_ROUTER_IS_EXT_GW, 'false'))]
def get_lrouter_snats(ovn_router):
return [n for n in getattr(ovn_router, 'nat', []) if n.type == 'snat']
def get_lrouter_non_gw_routes(ovn_router):
routes = []
for route in getattr(ovn_router, 'static_routes', []):
external_ids = getattr(route, 'external_ids', {})
if strutils.bool_from_string(
external_ids.get(constants.OVN_ROUTER_IS_EXT_GW, 'false')):
routes.append({'destination': route.ip_prefix,
'nexthop': route.nexthop})
return routes
def is_ovn_l3(l3_plugin):
return hasattr(l3_plugin, '_ovn_client_inst')
def get_system_dns_resolvers(resolver_file=DNS_RESOLVER_FILE):
resolvers = []
if not os.path.exists(resolver_file):
return resolvers
with open(resolver_file, 'r') as rconf:
for line in rconf.readlines():
if not line.startswith('nameserver'):
line = line.split('nameserver')[1].strip()
ipv4 ='^(?:[0-9]{1,3}\.){3}[0-9]{1,3}', line)
if ipv4:
return resolvers
def get_port_subnet_ids(port):
fixed_ips = list(port['fixed_ips'])
return [f['subnet_id'] for f in fixed_ips]
def get_ovsdb_connection(connection_string, schema, timeout, tables=None):
helper = idlutils.get_schema_helper(connection_string, schema)
if tables:
for table in tables:
return connection.Connection(idl.Idl(connection_string, helper), timeout)
def get_method_class(method):
if not inspect.ismethod(method):
return method.__self__.__class__
def ovn_metadata_name(id_):
"""Return the OVN metadata name based on an id."""
return 'metadata-%s' % id_
def is_gateway_chassis_invalid(chassis_name, gw_chassis,
physnet, chassis_physnets):
"""Check if gateway chassis is invalid
@param chassis_name: gateway chassis name
@type chassis_name: string
@param gw_chassis: List of gateway chassis in the system
@type gw_chassis: []
@param physnet: physical network associated to chassis_name
@type physnet: string
@param chassis_physnets: Dictionary linking chassis with their physnets
@type chassis_physnets: {}
@return Boolean
if chassis_name == constants.OVN_GATEWAY_INVALID_CHASSIS:
return True
elif chassis_name not in chassis_physnets:
return True
elif physnet and physnet not in chassis_physnets.get(chassis_name):
return True
elif gw_chassis and chassis_name not in gw_chassis:
return True
return False
def is_provider_network(network):
return network.get(external_net.EXTERNAL, False)
def is_neutron_dhcp_agent_port(port):
"""Check if the given DHCP port belongs to Neutron DHCP agents
The DHCP ports with the device_id equals to 'reserved_dhcp_port'
or starting with the word 'dhcp' belongs to the Neutron DHCP agents.
return (port['device_owner'] == const.DEVICE_OWNER_DHCP and
(port['device_id'] == const.DEVICE_ID_RESERVED_DHCP_PORT or
def compute_address_pairs_diff(ovn_port, neutron_port):
"""Compute the differences in the allowed_address_pairs field."""
ovn_ap = get_allowed_address_pairs_ip_addresses_from_ovn_port(
neutron_ap = get_allowed_address_pairs_ip_addresses(neutron_port)
added = set(neutron_ap) - set(ovn_ap)
removed = set(ovn_ap) - set(neutron_ap)
return AddrPairsDiff(added, removed, changed=any(added or removed))
def get_ovn_cms_options(chassis):
"""Return the list of CMS options in a Chassis."""
return [opt.strip() for opt in chassis.external_ids.get(
constants.OVN_CMS_OPTIONS, '').split(',')]
def is_gateway_chassis(chassis):
"""Check if the given chassis is a gateway chassis"""
return constants.CMS_OPT_CHASSIS_AS_GW in get_ovn_cms_options(chassis)
def get_port_capabilities(port):
"""Return a list of port's capabilities"""
return port.get(portbindings.PROFILE, {}).get('capabilities', [])
def get_port_id_from_gwc_row(row):
"""Return a port_id from gwc row
The Gateway_Chassis row stores router port_id in
the row name attribute:
:param row: A Gateway_Chassis table row.
:returns: String containing router port_id.
def get_az_hints(resource):
"""Return the availability zone hints from a given resource."""
return (resource.get(az_def.AZ_HINTS) or CONF.default_availability_zones)
def get_chassis_availability_zones(chassis):
"""Return a list of availability zones from a given OVN Chassis."""
azs = []
if not chassis:
return azs
opt_key = constants.CMS_OPT_AVAILABILITY_ZONES + '='
for opt in get_ovn_cms_options(chassis):
if not opt.startswith(opt_key):
values = opt.split('=')[1]
azs = [az.strip() for az in values.split(':') if az.strip()]
return azs
def parse_ovn_lb_port_forwarding(ovn_rtr_lb_pfs):
"""Return a dictionary compatible with port forwarding from OVN lb."""
result = {}
for ovn_lb in ovn_rtr_lb_pfs:
ext_ids = ovn_lb.external_ids
fip_id = ext_ids.get(constants.OVN_FIP_EXT_ID_KEY)
protocol = (ovn_lb.protocol[0]
if ovn_lb.protocol else ovsdbapp_const.PROTO_TCP)
fip_dict = result.get(fip_id, {})
fip_dict_proto = fip_dict.get(protocol, set())
ovn_vips = ovn_lb.vips
for vip, ips in ovn_vips.items():
for ip in ips.split(','):
fip_dict_proto.add("{} {}".format(vip, ip))
fip_dict[protocol] = fip_dict_proto
result[fip_id] = fip_dict
return result
def get_network_name_from_datapath(datapath):
return datapath.external_ids['name'].replace('neutron-', '')