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# 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.
# Copyright 2013 IBM Corp.
#
# 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-related utilities for supporting libvirt connection code."""
import os
import jinja2
import netaddr
from oslo.config import cfg
from nova.network import model
from nova import paths
CONF = cfg.CONF
netutils_opts = [
cfg.StrOpt('injected_network_template',
default=paths.basedir_def('nova/virt/interfaces.template'),
help='Template file for injected network'),
]
CONF.register_opts(netutils_opts)
CONF.import_opt('use_ipv6', 'nova.netconf')
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_first_network(network, version):
# Using a generator expression with a next() call for the first element
# of a list since we don't want to evaluate the whole list as we can
# have a lot of subnets
try:
return (i for i in network['subnets']
if i['version'] == version).next()
except StopIteration:
pass
def get_injected_network_template(network_info, use_ipv6=None, template=None,
libvirt_virt_type=None):
"""Returns a rendered network template for the given network_info.
:param network_info:
:py:meth:`~nova.network.manager.NetworkManager.get_instance_nw_info`
:param use_ipv6: If False, do not return IPv6 template information
even if an IPv6 subnet is present in network_info.
:param template: Path to the interfaces template file.
:param libvirt_virt_type: The Libvirt `virt_type`, will be `None` for
other hypervisors..
"""
if use_ipv6 is None:
use_ipv6 = CONF.use_ipv6
if not template:
template = CONF.injected_network_template
if not (network_info and template):
return
nets = []
ifc_num = -1
ipv6_is_available = False
for vif in network_info:
if not vif['network'] or not vif['network']['subnets']:
continue
network = vif['network']
# NOTE(bnemec): The template only supports a single subnet per
# interface and I'm not sure how/if that can be fixed, so this
# code only takes the first subnet of the appropriate type.
subnet_v4 = _get_first_network(network, 4)
subnet_v6 = _get_first_network(network, 6)
ifc_num += 1
if not network.get_meta('injected'):
continue
address = None
netmask = None
gateway = ''
broadcast = None
dns = None
if subnet_v4:
if subnet_v4.get_meta('dhcp_server') is not None:
continue
if subnet_v4['ips']:
ip = subnet_v4['ips'][0]
address = ip['address']
netmask = model.get_netmask(ip, subnet_v4)
if subnet_v4['gateway']:
gateway = subnet_v4['gateway']['address']
broadcast = str(subnet_v4.as_netaddr().broadcast)
dns = ' '.join([i['address'] for i in subnet_v4['dns']])
address_v6 = None
gateway_v6 = ''
netmask_v6 = None
dns_v6 = None
have_ipv6 = (use_ipv6 and subnet_v6)
if have_ipv6:
if subnet_v6.get_meta('dhcp_server') is not None:
continue
if subnet_v6['ips']:
ipv6_is_available = True
ip_v6 = subnet_v6['ips'][0]
address_v6 = ip_v6['address']
netmask_v6 = model.get_netmask(ip_v6, subnet_v6)
if subnet_v6['gateway']:
gateway_v6 = subnet_v6['gateway']['address']
dns_v6 = ' '.join([i['address'] for i in subnet_v6['dns']])
net_info = {'name': 'eth%d' % ifc_num,
'address': address,
'netmask': netmask,
'gateway': gateway,
'broadcast': broadcast,
'dns': dns,
'address_v6': address_v6,
'gateway_v6': gateway_v6,
'netmask_v6': netmask_v6,
'dns_v6': dns_v6,
}
nets.append(net_info)
if not nets:
return
tmpl_path, tmpl_file = os.path.split(CONF.injected_network_template)
env = jinja2.Environment(loader=jinja2.FileSystemLoader(tmpl_path),
trim_blocks=True)
template = env.get_template(tmpl_file)
return template.render({'interfaces': nets,
'use_ipv6': ipv6_is_available,
'libvirt_virt_type': libvirt_virt_type})
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