57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
# Copyright 2014 Cloudbase Solutions Srl
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import struct
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from oslo_config import cfg
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from oslo_log import log as oslo_logging
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from cloudbaseinit.osutils import factory as osutils_factory
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from cloudbaseinit.plugins.common import base
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from cloudbaseinit.utils import dhcp
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opts = [
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cfg.BoolOpt('mtu_use_dhcp_config', default=True,
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help='Configures the network interfaces MTU based on the '
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'values provided via DHCP'),
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]
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CONF = cfg.CONF
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CONF.register_opts(opts)
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LOG = oslo_logging.getLogger(__name__)
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class MTUPlugin(base.BasePlugin):
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def execute(self, service, shared_data):
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if CONF.mtu_use_dhcp_config:
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osutils = osutils_factory.get_os_utils()
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dhcp_hosts = osutils.get_dhcp_hosts_in_use()
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for (mac_address, dhcp_host) in dhcp_hosts:
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options_data = dhcp.get_dhcp_options(dhcp_host,
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[dhcp.OPTION_MTU])
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if options_data:
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mtu_option_data = options_data.get(dhcp.OPTION_MTU)
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if mtu_option_data:
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mtu = struct.unpack('!H', mtu_option_data)[0]
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osutils.set_network_adapter_mtu(mac_address, mtu)
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else:
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LOG.debug('Could not obtain the MTU configuration '
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'via DHCP for interface "%s"' % mac_address)
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return base.PLUGIN_EXECUTE_ON_NEXT_BOOT, False
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