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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (C) 2011 Midokura KK
# Copyright (C) 2011 Nicira, Inc
# Copyright 2011 OpenStack LLC.
# 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.
"""VIF drivers for libvirt."""
from nova import flags
from nova import log as logging
from nova.network import linux_net
from nova.virt.libvirt import netutils
from nova import utils
from nova.virt.vif import VIFDriver
LOG = logging.getLogger('nova.virt.libvirt.vif')
FLAGS = flags.FLAGS
flags.DEFINE_string('libvirt_ovs_bridge', 'br-int',
'Name of Integration Bridge used by Open vSwitch')
class LibvirtBridgeDriver(VIFDriver):
"""VIF driver for Linux bridge."""
def _get_configurations(self, network, mapping):
"""Get a dictionary of VIF configurations for bridge type."""
# Assume that the gateway also acts as the dhcp server.
gateway6 = mapping.get('gateway6')
mac_id = mapping['mac'].replace(':', '')
if FLAGS.allow_project_net_traffic:
template = "<parameter name=\"%s\"value=\"%s\" />\n"
net, mask = netutils.get_net_and_mask(network['cidr'])
values = [("PROJNET", net), ("PROJMASK", mask)]
if FLAGS.use_ipv6:
net_v6, prefixlen_v6 = netutils.get_net_and_prefixlen(
network['cidr_v6'])
values.extend([("PROJNETV6", net_v6),
("PROJMASKV6", prefixlen_v6)])
extra_params = "".join([template % value for value in values])
else:
extra_params = "\n"
result = {
'id': mac_id,
'bridge_name': network['bridge'],
'mac_address': mapping['mac'],
'ip_address': mapping['ips'][0]['ip'],
'dhcp_server': mapping['dhcp_server'],
'extra_params': extra_params,
}
if gateway6:
result['gateway6'] = gateway6 + "/128"
return result
def plug(self, instance, network, mapping):
"""Ensure that the bridge exists, and add VIF to it."""
if (not network.get('multi_host') and
mapping.get('should_create_bridge')):
if mapping.get('should_create_vlan'):
LOG.debug(_('Ensuring vlan %(vlan)s and bridge %(bridge)s'),
{'vlan': network['vlan'],
'bridge': network['bridge']})
linux_net.ensure_vlan_bridge(network['vlan'],
network['bridge'],
network['bridge_interface'])
else:
LOG.debug(_("Ensuring bridge %s"), network['bridge'])
linux_net.ensure_bridge(network['bridge'],
network['bridge_interface'])
return self._get_configurations(network, mapping)
def unplug(self, instance, network, mapping):
"""No manual unplugging required."""
pass
class LibvirtOpenVswitchDriver(VIFDriver):
"""VIF driver for Open vSwitch."""
def plug(self, instance, network, mapping):
vif_id = str(instance['id']) + "-" + str(network['id'])
dev = "tap-%s" % vif_id
iface_id = "nova-" + vif_id
if not linux_net._device_exists(dev):
utils.execute('sudo', 'ip', 'tuntap', 'add', dev, 'mode', 'tap')
utils.execute('sudo', 'ip', 'link', 'set', dev, 'up')
utils.execute('sudo', 'ovs-vsctl', '--', '--may-exist', 'add-port',
FLAGS.libvirt_ovs_bridge, dev,
'--', 'set', 'Interface', dev,
"external-ids:iface-id=%s" % iface_id,
'--', 'set', 'Interface', dev,
"external-ids:iface-status=active",
'--', 'set', 'Interface', dev,
"external-ids:attached-mac=%s" % mapping['mac'])
result = {
'script': '',
'name': dev,
'mac_address': mapping['mac']}
return result
def unplug(self, instance, network, mapping):
"""Unplug the VIF from the network by deleting the port from
the bridge."""
vif_id = str(instance['id']) + "-" + str(network['id'])
dev = "tap-%s" % vif_id
try:
utils.execute('sudo', 'ovs-vsctl', 'del-port',
network['bridge'], dev)
utils.execute('sudo', 'ip', 'link', 'delete', dev)
except:
LOG.warning(_("Failed while unplugging vif of instance '%s'"),
instance['name'])
raise
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