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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Copyright (c) 2010 Citrix Systems, Inc.
#
# 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.
"""Network-releated utilities for supporting libvirt connection code."""
import netaddr
from nova import flags
FLAGS = flags.FLAGS
flags.DECLARE('injected_network_template', 'nova.virt.disk.api')
Template = None
def _late_load_cheetah():
global Template
if Template is None:
t = __import__('Cheetah.Template', globals(), locals(),
['Template'], -1)
Template = t.Template
def get_net_and_mask(cidr):
net = netaddr.IPNetwork(cidr)
return str(net.ip), str(net.netmask)
def get_net_and_prefixlen(cidr):
net = netaddr.IPNetwork(cidr)
return str(net.ip), str(net._prefixlen)
def get_ip_version(cidr):
net = netaddr.IPNetwork(cidr)
return int(net.version)
def get_injected_network_template(network_info, use_ipv6=FLAGS.use_ipv6,
template=FLAGS.injected_network_template):
"""
return a rendered network template for the given network_info
:param network_info:
:py:meth:`~nova.network.manager.NetworkManager.get_instance_nw_info`
Note: this code actually depends on the legacy network_info, but will
convert the type itself if necessary.
"""
# the code below depends on the legacy 'network_info'
if hasattr(network_info, 'legacy'):
network_info = network_info.legacy()
nets = []
ifc_num = -1
have_injected_networks = False
for (network_ref, mapping) in network_info:
ifc_num += 1
if not network_ref['injected']:
continue
have_injected_networks = True
address = mapping['ips'][0]['ip']
netmask = mapping['ips'][0]['netmask']
address_v6 = None
gateway_v6 = None
netmask_v6 = None
if use_ipv6:
address_v6 = mapping['ip6s'][0]['ip']
netmask_v6 = mapping['ip6s'][0]['netmask']
gateway_v6 = mapping['gateway_v6']
net_info = {'name': 'eth%d' % ifc_num,
'address': address,
'netmask': netmask,
'gateway': mapping['gateway'],
'broadcast': mapping['broadcast'],
'dns': ' '.join(mapping['dns']),
'address_v6': address_v6,
'gateway_v6': gateway_v6,
'netmask_v6': netmask_v6}
nets.append(net_info)
if have_injected_networks is False:
return None
if not template:
return None
_late_load_cheetah()
ifc_template = open(template).read()
return str(Template(ifc_template,
searchList=[{'interfaces': nets,
'use_ipv6': use_ipv6}]))
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