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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 Nicira Networks, Inc
# 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.
from nova.network import linux_net
from nova.openstack.common import log as logging
from nova import utils
LOG = logging.getLogger(__name__)
class L3Driver(object):
"""Abstract class that defines a generic L3 API."""
def __init__(self, l3_lib=None):
raise NotImplementedError()
def initialize(self, **kwargs):
"""Set up basic L3 networking functionality."""
raise NotImplementedError()
def initialize_network(self, network):
"""Enable rules for a specific network."""
raise NotImplementedError()
def initialize_gateway(self, network):
"""Set up a gateway on this network."""
raise NotImplementedError()
def remove_gateway(self, network_ref):
"""Remove an existing gateway on this network."""
raise NotImplementedError()
def is_initialized(self):
""":returns: True/False (whether the driver is initialized)."""
raise NotImplementedError()
def add_floating_ip(self, floating_ip, fixed_ip, l3_interface_id,
network=None):
"""Add a floating IP bound to the fixed IP with an optional
l3_interface_id. Some drivers won't care about the
l3_interface_id so just pass None in that case. Network
is also an optional parameter.
"""
raise NotImplementedError()
def remove_floating_ip(self, floating_ip, fixed_ip, l3_interface_id,
network=None):
raise NotImplementedError()
def add_vpn(self, public_ip, port, private_ip):
raise NotImplementedError()
def remove_vpn(self, public_ip, port, private_ip):
raise NotImplementedError()
def clean_conntrack(self, fixed_ip):
raise NotImplementedError()
def teardown(self):
raise NotImplementedError()
class LinuxNetL3(L3Driver):
"""L3 driver that uses linux_net as the backend."""
def __init__(self):
self.initialized = False
def initialize(self, **kwargs):
if self.initialized:
return
LOG.debug("Initializing linux_net L3 driver")
fixed_range = kwargs.get('fixed_range', False)
networks = kwargs.get('networks', None)
if not fixed_range and networks is not None:
for network in networks:
self.initialize_network(network['cidr'])
else:
linux_net.init_host()
linux_net.ensure_metadata_ip()
linux_net.metadata_forward()
self.initialized = True
def is_initialized(self):
return self.initialized
def initialize_network(self, cidr):
linux_net.init_host(cidr)
def initialize_gateway(self, network_ref):
mac_address = utils.generate_mac_address()
dev = linux_net.plug(network_ref, mac_address,
gateway=(network_ref['gateway'] is not None))
linux_net.initialize_gateway_device(dev, network_ref)
def remove_gateway(self, network_ref):
linux_net.unplug(network_ref)
def add_floating_ip(self, floating_ip, fixed_ip, l3_interface_id,
network=None):
linux_net.ensure_floating_forward(floating_ip, fixed_ip,
l3_interface_id, network)
linux_net.bind_floating_ip(floating_ip, l3_interface_id)
def remove_floating_ip(self, floating_ip, fixed_ip, l3_interface_id,
network=None):
linux_net.unbind_floating_ip(floating_ip, l3_interface_id)
linux_net.remove_floating_forward(floating_ip, fixed_ip,
l3_interface_id, network)
def add_vpn(self, public_ip, port, private_ip):
linux_net.ensure_vpn_forward(public_ip, port, private_ip)
def remove_vpn(self, public_ip, port, private_ip):
# Linux net currently doesn't implement any way of removing
# the VPN forwarding rules
pass
def clean_conntrack(self, fixed_ip):
linux_net.clean_conntrack(fixed_ip)
def teardown(self):
pass
class NullL3(L3Driver):
"""The L3 driver that doesn't do anything. This class can be used when
nova-network should not manipulate L3 forwarding at all (e.g., in a Flat
or FlatDHCP scenario).
"""
def __init__(self):
pass
def initialize(self, **kwargs):
pass
def is_initialized(self):
return True
def initialize_network(self, cidr):
pass
def initialize_gateway(self, network_ref):
pass
def remove_gateway(self, network_ref):
pass
def add_floating_ip(self, floating_ip, fixed_ip, l3_interface_id,
network=None):
pass
def remove_floating_ip(self, floating_ip, fixed_ip, l3_interface_id,
network=None):
pass
def add_vpn(self, public_ip, port, private_ip):
pass
def remove_vpn(self, public_ip, port, private_ip):
pass
def clean_conntrack(self, fixed_ip):
pass
def teardown(self):
pass
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