138 lines
4.5 KiB
Python
138 lines
4.5 KiB
Python
# Copyright 2016 Red Hat, Inc
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# Copyright 2017 Rackspace Australia
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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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"""
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Linux network specific helpers.
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"""
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import os
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from oslo_concurrency import processutils
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from oslo_log import log as logging
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from oslo_utils import excutils
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import nova.privsep.linux_net
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LOG = logging.getLogger(__name__)
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def device_exists(device):
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"""Check if ethernet device exists."""
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return os.path.exists('/sys/class/net/%s' % device)
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def delete_net_dev(dev):
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"""Delete a network device only if it exists."""
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if device_exists(dev):
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try:
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delete_net_dev_escalated(dev)
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LOG.debug("Net device removed: '%s'", dev)
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except processutils.ProcessExecutionError:
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with excutils.save_and_reraise_exception():
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LOG.error("Failed removing net device: '%s'", dev)
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@nova.privsep.sys_admin_pctxt.entrypoint
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def delete_net_dev_escalated(dev):
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processutils.execute('ip', 'link', 'delete', dev,
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check_exit_code=[0, 2, 254])
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@nova.privsep.sys_admin_pctxt.entrypoint
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def set_device_mtu(dev, mtu):
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if mtu:
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processutils.execute('ip', 'link', 'set', dev, 'mtu',
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mtu, check_exit_code=[0, 2, 254])
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@nova.privsep.sys_admin_pctxt.entrypoint
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def set_device_enabled(dev):
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_set_device_enabled_inner(dev)
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def _set_device_enabled_inner(dev):
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processutils.execute('ip', 'link', 'set', dev, 'up',
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check_exit_code=[0, 2, 254])
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@nova.privsep.sys_admin_pctxt.entrypoint
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def set_device_trust(dev, vf_num, trusted):
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_set_device_trust_inner(dev, vf_num, trusted)
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def _set_device_trust_inner(dev, vf_num, trusted):
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processutils.execute('ip', 'link', 'set', dev,
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'vf', vf_num,
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'trust', bool(trusted) and 'on' or 'off',
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check_exit_code=[0, 2, 254])
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@nova.privsep.sys_admin_pctxt.entrypoint
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def set_device_macaddr(dev, mac_addr, port_state=None):
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_set_device_macaddr_inner(dev, mac_addr, port_state=port_state)
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def _set_device_macaddr_inner(dev, mac_addr, port_state=None):
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if port_state:
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processutils.execute('ip', 'link', 'set', dev, 'address', mac_addr,
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port_state, check_exit_code=[0, 2, 254])
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else:
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processutils.execute('ip', 'link', 'set', dev, 'address', mac_addr,
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check_exit_code=[0, 2, 254])
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@nova.privsep.sys_admin_pctxt.entrypoint
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def set_device_macaddr_and_vlan(dev, vf_num, mac_addr, vlan):
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processutils.execute('ip', 'link', 'set', dev,
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'vf', vf_num,
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'mac', mac_addr,
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'vlan', vlan,
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run_as_root=True,
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check_exit_code=[0, 2, 254])
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@nova.privsep.sys_admin_pctxt.entrypoint
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def create_tap_dev(dev, mac_address=None, multiqueue=False):
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if not device_exists(dev):
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try:
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# First, try with 'ip'
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cmd = ('ip', 'tuntap', 'add', dev, 'mode', 'tap')
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if multiqueue:
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cmd = cmd + ('multi_queue', )
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processutils.execute(*cmd, check_exit_code=[0, 2, 254])
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except processutils.ProcessExecutionError:
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if multiqueue:
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LOG.warning(
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'Failed to create a tap device with ip tuntap. '
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'tunctl does not support creation of multi-queue '
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'enabled devices, skipping fallback.')
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raise
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# Second option: tunctl
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processutils.execute('tunctl', '-b', '-t', dev)
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if mac_address:
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_set_device_macaddr_inner(dev, mac_address)
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_set_device_enabled_inner(dev)
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@nova.privsep.sys_admin_pctxt.entrypoint
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def add_vlan(bridge_interface, interface, vlan_num):
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processutils.execute('ip', 'link', 'add', 'link', bridge_interface,
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'name', interface, 'type', 'vlan',
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'id', vlan_num, check_exit_code=[0, 2, 254])
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