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OpenStack Study: mech_linuxbridge.py

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# 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.

from neutron.common import constants

from neutron.extensions import portbindings

from neutron.openstack.common import log

from neutron.plugins.ml2 import driver_api as api

from neutron.plugins.ml2.drivers import mech_agent

LOG = log.getLogger(__name__)

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class LinuxbridgeMechanismDriver(mech_agent.SimpleAgentMechanismDriverBase):

"""Attach to networks using linuxbridge L2 agent.

The LinuxbridgeMechanismDriver integrates the ml2 plugin with the

linuxbridge L2 agent. Port binding with this driver requires the

linuxbridge agent to be running on the port's host, and that agent

to have connectivity to at least one segment of the port's

network.

"""

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def __init__(self):

super(LinuxbridgeMechanismDriver, self).__init__(

constants.AGENT_TYPE_LINUXBRIDGE,

portbindings.VIF_TYPE_BRIDGE,

{portbindings.CAP_PORT_FILTER: True})

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def check_segment_for_agent(self, segment, agent):

mappings = agent['configurations'].get('interface_mappings', {})

tunnel_types = agent['configurations'].get('tunnel_types', [])

LOG.debug(_("Checking segment: %(segment)s "

"for mappings: %(mappings)s "

"with tunnel_types: %(tunnel_types)s"),

{'segment': segment, 'mappings': mappings,

'tunnel_types': tunnel_types})

network_type = segment[api.NETWORK_TYPE]

if network_type == 'local':

return True

elif network_type in tunnel_types:

return True

elif network_type in ['flat', 'vlan']:

return segment[api.PHYSICAL_NETWORK] in mappings

else:

return False