OpenStack Networking (Neutron)
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neutron/neutron/agent/linux/ra.py

122 lines
3.8 KiB

# Copyright 2014 OpenStack Foundation
# 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.
import netaddr
from oslo.config import cfg
import six
from neutron.agent.linux import external_process
from neutron.agent.linux import utils
from neutron.common import constants
from neutron.openstack.common import log as logging
LOG = logging.getLogger(__name__)
OPTS = [
cfg.StrOpt('ra_confs',
default='$state_path/ra',
help=_('Location to store IPv6 RA config files')),
]
cfg.CONF.register_opts(OPTS)
prefix_fmt = """interface %s
{
AdvSendAdvert on;
MinRtrAdvInterval 3;
MaxRtrAdvInterval 10;
prefix %s
{
AdvOnLink on;
AdvAutonomous on;
};
};
"""
default_fmt = """interface %s
{
AdvSendAdvert on;
MinRtrAdvInterval 3;
MaxRtrAdvInterval 10;
};
"""
def _is_slaac(ra_mode):
return (ra_mode == constants.IPV6_SLAAC or
ra_mode == constants.DHCPV6_STATELESS)
def _generate_radvd_conf(router_id, router_ports, dev_name_helper):
radvd_conf = utils.get_conf_file_name(cfg.CONF.ra_confs,
router_id,
'radvd.conf',
True)
buf = six.StringIO()
for p in router_ports:
if netaddr.IPNetwork(p['subnet']['cidr']).version == 6:
interface_name = dev_name_helper(p['id'])
if _is_slaac(p['subnet']['ipv6_ra_mode']):
conf_str = prefix_fmt % (interface_name,
p['subnet']['cidr'])
else:
conf_str = default_fmt % interface_name
buf.write('%s' % conf_str)
utils.replace_file(radvd_conf, buf.getvalue())
return radvd_conf
def _spawn_radvd(router_id, radvd_conf, router_ns, root_helper):
def callback(pid_file):
radvd_cmd = ['radvd',
'-C', '%s' % radvd_conf,
'-p', '%s' % pid_file]
return radvd_cmd
radvd = external_process.ProcessManager(cfg.CONF,
router_id,
root_helper,
router_ns,
'radvd')
radvd.enable(callback, True)
LOG.debug("radvd enabled for router %s", router_id)
def enable_ipv6_ra(router_id, router_ns, router_ports,
dev_name_helper, root_helper):
for p in router_ports:
if netaddr.IPNetwork(p['subnet']['cidr']).version == 6:
break
else:
# Kill the daemon if it's running
disable_ipv6_ra(router_id, router_ns, root_helper)
return
LOG.debug("Enable IPv6 RA for router %s", router_id)
radvd_conf = _generate_radvd_conf(router_id, router_ports, dev_name_helper)
_spawn_radvd(router_id, radvd_conf, router_ns, root_helper)
def disable_ipv6_ra(router_id, router_ns, root_helper):
radvd = external_process.ProcessManager(cfg.CONF,
router_id,
root_helper,
router_ns,
'radvd')
radvd.disable()
utils.remove_conf_files(cfg.CONF.ra_confs, router_id)
LOG.debug("radvd disabled for router %s", router_id)