5888af0815
While most of the vendor plugins will be in separate repositories, the os-vif library will include the Linux bridge plugin as one of the reference implementations. Change-Id: If53e1e987991a9695ff4390bb9a52d7a80c0e2ee
196 lines
8.4 KiB
Python
196 lines
8.4 KiB
Python
# Derived from nova/network/linux_net.py
|
|
#
|
|
# Copyright (c) 2011 X.commerce, a business unit of eBay Inc.
|
|
# Copyright 2010 United States Government as represented by the
|
|
# Administrator of the National Aeronautics and Space Administration.
|
|
# 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.
|
|
|
|
"""Implements vlans, bridges, and iptables rules using linux utilities."""
|
|
|
|
import os
|
|
|
|
from oslo_concurrency import lockutils
|
|
from oslo_concurrency import processutils
|
|
from oslo_log import log as logging
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
_IPTABLES_MANAGER = None
|
|
|
|
|
|
def device_exists(device):
|
|
"""Check if ethernet device exists."""
|
|
return os.path.exists('/sys/class/net/%s' % device)
|
|
|
|
|
|
def _set_device_mtu(dev, mtu):
|
|
"""Set the device MTU."""
|
|
processutils.execute('ip', 'link', 'set', dev, 'mtu', mtu,
|
|
check_exit_code=[0, 2, 254])
|
|
|
|
|
|
def _ip_bridge_cmd(action, params, device):
|
|
"""Build commands to add/del ips to bridges/devices."""
|
|
cmd = ['ip', 'addr', action]
|
|
cmd.extend(params)
|
|
cmd.extend(['dev', device])
|
|
return cmd
|
|
|
|
|
|
def ensure_vlan_bridge(vlan_num, bridge, bridge_interface,
|
|
net_attrs=None, mac_address=None,
|
|
mtu=None):
|
|
"""Create a vlan and bridge unless they already exist."""
|
|
interface = ensure_vlan(vlan_num, bridge_interface, mac_address, mtu=mtu)
|
|
ensure_bridge(bridge, interface, net_attrs)
|
|
return interface
|
|
|
|
|
|
@lockutils.synchronized('nova-lock_vlan', external=True)
|
|
def ensure_vlan(vlan_num, bridge_interface, mac_address=None, mtu=None):
|
|
"""Create a vlan unless it already exists."""
|
|
interface = 'vlan%s' % vlan_num
|
|
if not device_exists(interface):
|
|
LOG.debug('Starting VLAN interface %s', interface)
|
|
processutils.execute('ip', 'link', 'add', 'link',
|
|
bridge_interface, 'name', interface, 'type',
|
|
'vlan', 'id', vlan_num,
|
|
check_exit_code=[0, 2, 254],
|
|
run_as_root=True)
|
|
# (danwent) the bridge will inherit this address, so we want to
|
|
# make sure it is the value set from the NetworkManager
|
|
if mac_address:
|
|
processutils.execute('ip', 'link', 'set', interface,
|
|
'address', mac_address,
|
|
check_exit_code=[0, 2, 254],
|
|
run_as_root=True)
|
|
processutils.execute('ip', 'link', 'set', interface, 'up',
|
|
check_exit_code=[0, 2, 254],
|
|
run_as_root=True)
|
|
# NOTE(vish): set mtu every time to ensure that changes to mtu get
|
|
# propogated
|
|
_set_device_mtu(interface, mtu)
|
|
return interface
|
|
|
|
|
|
@lockutils.synchronized('nova-lock_bridge', external=True)
|
|
def ensure_bridge(bridge, interface, net_attrs=None, gateway=True,
|
|
filtering=True):
|
|
"""Create a bridge unless it already exists.
|
|
|
|
:param interface: the interface to create the bridge on.
|
|
:param net_attrs: dictionary with attributes used to create bridge.
|
|
:param gateway: whether or not the bridge is a gateway.
|
|
:param filtering: whether or not to create filters on the bridge.
|
|
|
|
If net_attrs is set, it will add the net_attrs['gateway'] to the bridge
|
|
using net_attrs['broadcast'] and net_attrs['cidr']. It will also add
|
|
the ip_v6 address specified in net_attrs['cidr_v6'] if use_ipv6 is set.
|
|
|
|
The code will attempt to move any ips that already exist on the
|
|
interface onto the bridge and reset the default gateway if necessary.
|
|
|
|
"""
|
|
if not device_exists(bridge):
|
|
LOG.debug('Starting Bridge %s', bridge)
|
|
processutils.execute('brctl', 'addbr', bridge,
|
|
run_as_root=True)
|
|
processutils.execute('brctl', 'setfd', bridge, 0,
|
|
run_as_root=True)
|
|
# processutils.execute('brctl setageing %s 10' % bridge,
|
|
# run_as_root=True)
|
|
processutils.execute('brctl', 'stp', bridge, 'off',
|
|
run_as_root=True)
|
|
# (danwent) bridge device MAC address can't be set directly.
|
|
# instead it inherits the MAC address of the first device on the
|
|
# bridge, which will either be the vlan interface, or a
|
|
# physical NIC.
|
|
processutils.execute('ip', 'link', 'set', bridge, 'up',
|
|
run_as_root=True)
|
|
|
|
if interface:
|
|
LOG.debug('Adding interface %(interface)s to bridge %(bridge)s',
|
|
{'interface': interface, 'bridge': bridge})
|
|
out, err = processutils.execute('brctl', 'addif', bridge,
|
|
interface, check_exit_code=False,
|
|
run_as_root=True)
|
|
if (err and err != "device %s is already a member of a bridge; "
|
|
"can't enslave it to bridge %s.\n" % (interface, bridge)):
|
|
msg = _('Failed to add interface: %s') % err
|
|
raise Exception(msg)
|
|
|
|
out, err = processutils.execute('ip', 'link', 'set',
|
|
interface, 'up', check_exit_code=False,
|
|
run_as_root=True)
|
|
|
|
# NOTE(vish): This will break if there is already an ip on the
|
|
# interface, so we move any ips to the bridge
|
|
# NOTE(danms): We also need to copy routes to the bridge so as
|
|
# not to break existing connectivity on the interface
|
|
old_routes = []
|
|
out, err = processutils.execute('ip', 'route', 'show', 'dev',
|
|
interface)
|
|
for line in out.split('\n'):
|
|
fields = line.split()
|
|
if fields and 'via' in fields:
|
|
old_routes.append(fields)
|
|
processutils.execute('ip', 'route', 'del', *fields,
|
|
run_as_root=True)
|
|
out, err = processutils.execute('ip', 'addr', 'show', 'dev', interface,
|
|
'scope', 'global')
|
|
for line in out.split('\n'):
|
|
fields = line.split()
|
|
if fields and fields[0] == 'inet':
|
|
if fields[-2] in ('secondary', 'dynamic', ):
|
|
params = fields[1:-2]
|
|
else:
|
|
params = fields[1:-1]
|
|
processutils.execute(*_ip_bridge_cmd('del', params,
|
|
fields[-1]),
|
|
check_exit_code=[0, 2, 254],
|
|
run_as_root=True)
|
|
processutils.execute(*_ip_bridge_cmd('add', params,
|
|
bridge),
|
|
check_exit_code=[0, 2, 254],
|
|
run_as_root=True)
|
|
for fields in old_routes:
|
|
processutils.execute('ip', 'route', 'add', *fields,
|
|
run_as_root=True)
|
|
|
|
if filtering:
|
|
# Don't forward traffic unless we were told to be a gateway
|
|
global _IPTABLES_MANAGER
|
|
ipv4_filter = _IPTABLES_MANAGER.ipv4['filter']
|
|
if gateway:
|
|
for rule in _IPTABLES_MANAGER.get_gateway_rules(bridge):
|
|
ipv4_filter.add_rule(*rule)
|
|
else:
|
|
ipv4_filter.add_rule('FORWARD',
|
|
('--in-interface %s -j %s'
|
|
% (bridge,
|
|
_IPTABLES_MANAGER.iptables_drop_action)))
|
|
ipv4_filter.add_rule('FORWARD',
|
|
('--out-interface %s -j %s'
|
|
% (bridge,
|
|
_IPTABLES_MANAGER.iptables_drop_action)))
|
|
|
|
|
|
def configure(iptables_mgr):
|
|
"""Configure the iptables manager impl.
|
|
|
|
:param iptables_mgr: the iptables manager instance
|
|
"""
|
|
global _IPTABLES_MANAGER
|
|
_IPTABLES_MANAGER = iptables_mgr
|