/usr/lib/python3/dist-packages/vif_plug_linux_bridge/linux_net.py is in python3-os-vif 1.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 | # 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
from oslo_utils import excutils
from vif_plug_linux_bridge import privsep
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
@privsep.vif_plug.entrypoint
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_privileged(vlan_num, bridge_interface,
mac_address, mtu=mtu)
_ensure_bridge_privileged(bridge, interface, net_attrs)
_ensure_bridge_filtering(bridge, None)
return interface
@lockutils.synchronized('nova-lock_vlan', external=True)
def _ensure_vlan_privileged(vlan_num, bridge_interface, mac_address, mtu):
"""Create a vlan unless it already exists.
This assumes the caller is already annotated to run
with elevated privileges.
"""
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])
# (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])
processutils.execute('ip', 'link', 'set', interface, 'up',
check_exit_code=[0, 2, 254])
if mtu:
# NOTE(vish): set mtu every time to ensure that changes to mtu get
# propogated
_set_device_mtu(interface, mtu)
else:
LOG.debug("MTU not set on %(interface_name)s interface",
{'interface_name': interface})
return interface
@lockutils.synchronized('nova-lock_bridge', external=True)
def ensure_bridge(bridge, interface, net_attrs=None, gateway=True,
filtering=True):
_ensure_bridge_privileged(bridge, interface, net_attrs, gateway, filtering)
if filtering:
_ensure_bridge_filtering(bridge, gateway)
@privsep.vif_plug.entrypoint
def _ensure_bridge_privileged(bridge, interface, net_attrs, gateway,
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)
try:
processutils.execute('brctl', 'addbr', bridge)
except Exception:
with excutils.save_and_reraise_exception() as ectx:
ectx.reraise = not device_exists(bridge)
processutils.execute('brctl', 'setfd', bridge, 0)
# processutils.execute('brctl setageing %s 10' % bridge)
processutils.execute('brctl', 'stp', bridge, 'off')
disv6 = ('/proc/sys/net/ipv6/conf/%s/disable_ipv6' % bridge)
if os.path.exists(disv6):
processutils.execute('tee',
disv6,
process_input='1',
check_exit_code=[0, 1])
# (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')
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)
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)
# 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)
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])
processutils.execute(*_ip_bridge_cmd('add', params,
bridge),
check_exit_code=[0, 2, 254])
for fields in old_routes:
processutils.execute('ip', 'route', 'add', *fields)
def _ensure_bridge_filtering(bridge, gateway):
# This method leaves privsep usage to iptables manager
# Don't forward traffic unless we were told to be a gateway
LOG.debug("Ensuring filtering %s to %s", bridge, 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)))
_IPTABLES_MANAGER.apply()
def configure(iptables_mgr):
"""Configure the iptables manager impl.
:param iptables_mgr: the iptables manager instance
"""
global _IPTABLES_MANAGER
_IPTABLES_MANAGER = iptables_mgr
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