678 lines
25 KiB
Python
678 lines
25 KiB
Python
# Copyright 2011 VMware, Inc.
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# All Rights Reserved.
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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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import collections
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import itertools
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import operator
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from oslo_config import cfg
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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 retrying
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import six
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import uuid
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from neutron.agent.common import utils
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from neutron.agent.linux import ip_lib
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from neutron.agent.ovsdb import api as ovsdb
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from neutron.common import exceptions
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from neutron.i18n import _LE, _LI, _LW
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from neutron.plugins.common import constants as p_const
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from neutron.plugins.ml2.drivers.openvswitch.agent.common \
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import constants
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# Default timeout for ovs-vsctl command
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DEFAULT_OVS_VSCTL_TIMEOUT = 10
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# Special return value for an invalid OVS ofport
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INVALID_OFPORT = -1
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UNASSIGNED_OFPORT = []
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# OVS bridge fail modes
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FAILMODE_SECURE = 'secure'
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FAILMODE_STANDALONE = 'standalone'
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OPTS = [
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cfg.IntOpt('ovs_vsctl_timeout',
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default=DEFAULT_OVS_VSCTL_TIMEOUT,
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help=_('Timeout in seconds for ovs-vsctl commands. '
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'If the timeout expires, ovs commands will fail with '
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'ALARMCLOCK error.')),
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]
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cfg.CONF.register_opts(OPTS)
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LOG = logging.getLogger(__name__)
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OVS_DEFAULT_CAPS = {
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'datapath_types': [],
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'iface_types': [],
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}
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def _ofport_result_pending(result):
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"""Return True if ovs-vsctl indicates the result is still pending."""
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# ovs-vsctl can return '[]' for an ofport that has not yet been assigned
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try:
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int(result)
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return False
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except (ValueError, TypeError):
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return True
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def _ofport_retry(fn):
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"""Decorator for retrying when OVS has yet to assign an ofport.
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The instance's vsctl_timeout is used as the max waiting time. This relies
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on the fact that instance methods receive self as the first argument.
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"""
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@six.wraps(fn)
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def wrapped(*args, **kwargs):
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self = args[0]
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new_fn = retrying.retry(
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retry_on_result=_ofport_result_pending,
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stop_max_delay=self.vsctl_timeout * 1000,
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wait_exponential_multiplier=10,
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wait_exponential_max=1000,
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retry_on_exception=lambda _: False)(fn)
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return new_fn(*args, **kwargs)
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return wrapped
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class VifPort(object):
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def __init__(self, port_name, ofport, vif_id, vif_mac, switch):
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self.port_name = port_name
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self.ofport = ofport
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self.vif_id = vif_id
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self.vif_mac = vif_mac
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self.switch = switch
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def __str__(self):
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return ("iface-id=" + self.vif_id + ", vif_mac=" +
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self.vif_mac + ", port_name=" + self.port_name +
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", ofport=" + str(self.ofport) + ", bridge_name=" +
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self.switch.br_name)
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class BaseOVS(object):
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def __init__(self):
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self.vsctl_timeout = cfg.CONF.ovs_vsctl_timeout
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self.ovsdb = ovsdb.API.get(self)
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def add_bridge(self, bridge_name,
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datapath_type=constants.OVS_DATAPATH_SYSTEM):
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self.ovsdb.add_br(bridge_name,
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datapath_type).execute()
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br = OVSBridge(bridge_name)
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# Don't return until vswitchd sets up the internal port
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br.get_port_ofport(bridge_name)
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return br
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def delete_bridge(self, bridge_name):
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self.ovsdb.del_br(bridge_name).execute()
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def bridge_exists(self, bridge_name):
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return self.ovsdb.br_exists(bridge_name).execute()
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def port_exists(self, port_name):
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cmd = self.ovsdb.db_get('Port', port_name, 'name')
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return bool(cmd.execute(check_error=False, log_errors=False))
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def get_bridge_for_iface(self, iface):
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return self.ovsdb.iface_to_br(iface).execute()
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def get_bridges(self):
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return self.ovsdb.list_br().execute(check_error=True)
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def get_bridge_external_bridge_id(self, bridge):
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return self.ovsdb.br_get_external_id(bridge, 'bridge-id').execute()
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def set_db_attribute(self, table_name, record, column, value,
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check_error=False, log_errors=True):
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self.ovsdb.db_set(table_name, record, (column, value)).execute(
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check_error=check_error, log_errors=log_errors)
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def clear_db_attribute(self, table_name, record, column):
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self.ovsdb.db_clear(table_name, record, column).execute()
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def db_get_val(self, table, record, column, check_error=False,
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log_errors=True):
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return self.ovsdb.db_get(table, record, column).execute(
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check_error=check_error, log_errors=log_errors)
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@property
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def config(self):
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"""A dict containing the only row from the root Open_vSwitch table
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This row contains several columns describing the Open vSwitch install
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and the system on which it is installed. Useful keys include:
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datapath_types: a list of supported datapath types
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iface_types: a list of supported interface types
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ovs_version: the OVS version
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"""
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return self.ovsdb.db_list("Open_vSwitch").execute()[0]
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@property
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def capabilities(self):
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_cfg = self.config
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return {k: _cfg.get(k, OVS_DEFAULT_CAPS[k]) for k in OVS_DEFAULT_CAPS}
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class OVSBridge(BaseOVS):
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def __init__(self, br_name, datapath_type=constants.OVS_DATAPATH_SYSTEM):
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super(OVSBridge, self).__init__()
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self.br_name = br_name
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self.datapath_type = datapath_type
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self.agent_uuid_stamp = 0
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def set_agent_uuid_stamp(self, val):
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self.agent_uuid_stamp = val
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def set_controller(self, controllers):
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self.ovsdb.set_controller(self.br_name,
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controllers).execute(check_error=True)
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def del_controller(self):
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self.ovsdb.del_controller(self.br_name).execute(check_error=True)
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def get_controller(self):
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return self.ovsdb.get_controller(self.br_name).execute(
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check_error=True)
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def _set_bridge_fail_mode(self, mode):
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self.ovsdb.set_fail_mode(self.br_name, mode).execute(check_error=True)
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def set_secure_mode(self):
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self._set_bridge_fail_mode(FAILMODE_SECURE)
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def set_standalone_mode(self):
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self._set_bridge_fail_mode(FAILMODE_STANDALONE)
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def set_protocols(self, protocols):
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self.set_db_attribute('Bridge', self.br_name, 'protocols', protocols,
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check_error=True)
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def create(self, secure_mode=False):
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with self.ovsdb.transaction() as txn:
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txn.add(
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self.ovsdb.add_br(self.br_name,
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datapath_type=self.datapath_type))
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if secure_mode:
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txn.add(self.ovsdb.set_fail_mode(self.br_name,
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FAILMODE_SECURE))
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# Don't return until vswitchd sets up the internal port
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self.get_port_ofport(self.br_name)
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def destroy(self):
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self.delete_bridge(self.br_name)
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def add_port(self, port_name, *interface_attr_tuples):
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with self.ovsdb.transaction() as txn:
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txn.add(self.ovsdb.add_port(self.br_name, port_name))
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if interface_attr_tuples:
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txn.add(self.ovsdb.db_set('Interface', port_name,
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*interface_attr_tuples))
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return self.get_port_ofport(port_name)
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def replace_port(self, port_name, *interface_attr_tuples):
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"""Replace existing port or create it, and configure port interface."""
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with self.ovsdb.transaction() as txn:
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txn.add(self.ovsdb.del_port(port_name))
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txn.add(self.ovsdb.add_port(self.br_name, port_name,
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may_exist=False))
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if interface_attr_tuples:
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txn.add(self.ovsdb.db_set('Interface', port_name,
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*interface_attr_tuples))
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# Don't return until the port has been assigned by vswitchd
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self.get_port_ofport(port_name)
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def delete_port(self, port_name):
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self.ovsdb.del_port(port_name, self.br_name).execute()
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def run_ofctl(self, cmd, args, process_input=None):
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full_args = ["ovs-ofctl", cmd, self.br_name] + args
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try:
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return utils.execute(full_args, run_as_root=True,
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process_input=process_input)
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except Exception as e:
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LOG.error(_LE("Unable to execute %(cmd)s. Exception: "
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"%(exception)s"),
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{'cmd': full_args, 'exception': e})
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def count_flows(self):
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flow_list = self.run_ofctl("dump-flows", []).split("\n")[1:]
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return len(flow_list) - 1
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def remove_all_flows(self):
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self.run_ofctl("del-flows", [])
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@_ofport_retry
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def _get_port_ofport(self, port_name):
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return self.db_get_val("Interface", port_name, "ofport")
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def get_port_ofport(self, port_name):
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"""Get the port's assigned ofport, retrying if not yet assigned."""
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ofport = INVALID_OFPORT
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try:
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ofport = self._get_port_ofport(port_name)
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except retrying.RetryError:
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LOG.exception(_LE("Timed out retrieving ofport on port %s."),
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port_name)
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return ofport
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def get_datapath_id(self):
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return self.db_get_val('Bridge',
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self.br_name, 'datapath_id')
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def do_action_flows(self, action, kwargs_list):
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if action != 'del':
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for kw in kwargs_list:
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if 'cookie' not in kw:
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kw['cookie'] = self.agent_uuid_stamp
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flow_strs = [_build_flow_expr_str(kw, action) for kw in kwargs_list]
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self.run_ofctl('%s-flows' % action, ['-'], '\n'.join(flow_strs))
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def add_flow(self, **kwargs):
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self.do_action_flows('add', [kwargs])
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def mod_flow(self, **kwargs):
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self.do_action_flows('mod', [kwargs])
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def delete_flows(self, **kwargs):
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self.do_action_flows('del', [kwargs])
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def dump_flows_for_table(self, table):
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retval = None
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flow_str = "table=%s" % table
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flows = self.run_ofctl("dump-flows", [flow_str])
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if flows:
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retval = '\n'.join(item for item in flows.splitlines()
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if 'NXST' not in item)
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return retval
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def dump_all_flows(self):
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return [f for f in self.run_ofctl("dump-flows", []).splitlines()
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if 'NXST' not in f]
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def deferred(self, **kwargs):
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return DeferredOVSBridge(self, **kwargs)
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def add_tunnel_port(self, port_name, remote_ip, local_ip,
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tunnel_type=p_const.TYPE_GRE,
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vxlan_udp_port=p_const.VXLAN_UDP_PORT,
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dont_fragment=True,
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tunnel_csum=False):
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attrs = [('type', tunnel_type)]
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# TODO(twilson) This is an OrderedDict solely to make a test happy
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options = collections.OrderedDict()
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vxlan_uses_custom_udp_port = (
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tunnel_type == p_const.TYPE_VXLAN and
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vxlan_udp_port != p_const.VXLAN_UDP_PORT
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)
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if vxlan_uses_custom_udp_port:
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options['dst_port'] = vxlan_udp_port
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options['df_default'] = str(dont_fragment).lower()
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options['remote_ip'] = remote_ip
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options['local_ip'] = local_ip
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options['in_key'] = 'flow'
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options['out_key'] = 'flow'
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if tunnel_csum:
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options['csum'] = str(tunnel_csum).lower()
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attrs.append(('options', options))
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return self.add_port(port_name, *attrs)
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def add_patch_port(self, local_name, remote_name):
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attrs = [('type', 'patch'),
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('options', {'peer': remote_name})]
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return self.add_port(local_name, *attrs)
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def get_iface_name_list(self):
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# get the interface name list for this bridge
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return self.ovsdb.list_ifaces(self.br_name).execute(check_error=True)
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def get_port_name_list(self):
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# get the port name list for this bridge
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return self.ovsdb.list_ports(self.br_name).execute(check_error=True)
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def get_port_stats(self, port_name):
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return self.db_get_val("Interface", port_name, "statistics")
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def get_xapi_iface_id(self, xs_vif_uuid):
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args = ["xe", "vif-param-get", "param-name=other-config",
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"param-key=nicira-iface-id", "uuid=%s" % xs_vif_uuid]
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try:
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return utils.execute(args, run_as_root=True).strip()
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except Exception as e:
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with excutils.save_and_reraise_exception():
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LOG.error(_LE("Unable to execute %(cmd)s. "
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"Exception: %(exception)s"),
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{'cmd': args, 'exception': e})
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def get_ports_attributes(self, table, columns=None, ports=None,
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check_error=True, log_errors=True,
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if_exists=False):
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port_names = ports or self.get_port_name_list()
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if not port_names:
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return []
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return (self.ovsdb.db_list(table, port_names, columns=columns,
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if_exists=if_exists).
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execute(check_error=check_error, log_errors=log_errors))
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# returns a VIF object for each VIF port
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def get_vif_ports(self):
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edge_ports = []
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port_info = self.get_ports_attributes(
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'Interface', columns=['name', 'external_ids', 'ofport'],
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if_exists=True)
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for port in port_info:
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name = port['name']
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external_ids = port['external_ids']
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ofport = port['ofport']
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if "iface-id" in external_ids and "attached-mac" in external_ids:
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p = VifPort(name, ofport, external_ids["iface-id"],
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external_ids["attached-mac"], self)
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edge_ports.append(p)
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elif ("xs-vif-uuid" in external_ids and
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"attached-mac" in external_ids):
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# if this is a xenserver and iface-id is not automatically
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# synced to OVS from XAPI, we grab it from XAPI directly
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iface_id = self.get_xapi_iface_id(external_ids["xs-vif-uuid"])
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p = VifPort(name, ofport, iface_id,
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external_ids["attached-mac"], self)
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edge_ports.append(p)
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return edge_ports
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def get_vif_port_to_ofport_map(self):
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results = self.get_ports_attributes(
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'Interface', columns=['name', 'external_ids', 'ofport'],
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if_exists=True)
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port_map = {}
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for r in results:
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# fall back to basic interface name
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key = self.portid_from_external_ids(r['external_ids']) or r['name']
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try:
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port_map[key] = int(r['ofport'])
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except TypeError:
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# port doesn't yet have an ofport entry so we ignore it
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pass
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return port_map
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def get_vif_port_set(self):
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edge_ports = set()
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results = self.get_ports_attributes(
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'Interface', columns=['name', 'external_ids', 'ofport'],
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if_exists=True)
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for result in results:
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if result['ofport'] == UNASSIGNED_OFPORT:
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LOG.warn(_LW("Found not yet ready openvswitch port: %s"),
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result['name'])
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elif result['ofport'] == INVALID_OFPORT:
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LOG.warn(_LW("Found failed openvswitch port: %s"),
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result['name'])
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elif 'attached-mac' in result['external_ids']:
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port_id = self.portid_from_external_ids(result['external_ids'])
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if port_id:
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edge_ports.add(port_id)
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return edge_ports
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def portid_from_external_ids(self, external_ids):
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if 'iface-id' in external_ids:
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return external_ids['iface-id']
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if 'xs-vif-uuid' in external_ids:
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iface_id = self.get_xapi_iface_id(
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external_ids['xs-vif-uuid'])
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return iface_id
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def get_port_tag_dict(self):
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"""Get a dict of port names and associated vlan tags.
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e.g. the returned dict is of the following form::
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{u'int-br-eth2': [],
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u'patch-tun': [],
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u'qr-76d9e6b6-21': 1,
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u'tapce5318ff-78': 1,
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u'tape1400310-e6': 1}
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The TAG ID is only available in the "Port" table and is not available
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in the "Interface" table queried by the get_vif_port_set() method.
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"""
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results = self.get_ports_attributes(
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'Port', columns=['name', 'tag'], if_exists=True)
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return {p['name']: p['tag'] for p in results}
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def get_vifs_by_ids(self, port_ids):
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interface_info = self.get_ports_attributes(
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"Interface", columns=["name", "external_ids", "ofport"],
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if_exists=True)
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by_id = {x['external_ids'].get('iface-id'): x for x in interface_info}
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result = {}
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for port_id in port_ids:
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result[port_id] = None
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if port_id not in by_id:
|
|
LOG.info(_LI("Port %(port_id)s not present in bridge "
|
|
"%(br_name)s"),
|
|
{'port_id': port_id, 'br_name': self.br_name})
|
|
continue
|
|
pinfo = by_id[port_id]
|
|
if not self._check_ofport(port_id, pinfo):
|
|
continue
|
|
mac = pinfo['external_ids'].get('attached-mac')
|
|
result[port_id] = VifPort(pinfo['name'], pinfo['ofport'],
|
|
port_id, mac, self)
|
|
return result
|
|
|
|
@staticmethod
|
|
def _check_ofport(port_id, port_info):
|
|
if port_info['ofport'] in [UNASSIGNED_OFPORT, INVALID_OFPORT]:
|
|
LOG.warn(_LW("ofport: %(ofport)s for VIF: %(vif)s is not a"
|
|
" positive integer"),
|
|
{'ofport': port_info['ofport'], 'vif': port_id})
|
|
return False
|
|
return True
|
|
|
|
def get_vif_port_by_id(self, port_id):
|
|
ports = self.ovsdb.db_find(
|
|
'Interface', ('external_ids', '=', {'iface-id': port_id}),
|
|
('external_ids', '!=', {'attached-mac': ''}),
|
|
columns=['external_ids', 'name', 'ofport']).execute()
|
|
for port in ports:
|
|
if self.br_name != self.get_bridge_for_iface(port['name']):
|
|
continue
|
|
if not self._check_ofport(port_id, port):
|
|
continue
|
|
mac = port['external_ids'].get('attached-mac')
|
|
return VifPort(port['name'], port['ofport'], port_id, mac, self)
|
|
LOG.info(_LI("Port %(port_id)s not present in bridge %(br_name)s"),
|
|
{'port_id': port_id, 'br_name': self.br_name})
|
|
|
|
def delete_ports(self, all_ports=False):
|
|
if all_ports:
|
|
port_names = self.get_port_name_list()
|
|
else:
|
|
port_names = (port.port_name for port in self.get_vif_ports())
|
|
|
|
for port_name in port_names:
|
|
self.delete_port(port_name)
|
|
|
|
def get_local_port_mac(self):
|
|
"""Retrieve the mac of the bridge's local port."""
|
|
address = ip_lib.IPDevice(self.br_name).link.address
|
|
if address:
|
|
return address
|
|
else:
|
|
msg = _('Unable to determine mac address for %s') % self.br_name
|
|
raise Exception(msg)
|
|
|
|
def set_controllers_connection_mode(self, connection_mode):
|
|
"""Set bridge controllers connection mode.
|
|
|
|
:param connection_mode: "out-of-band" or "in-band"
|
|
"""
|
|
attr = [('connection_mode', connection_mode)]
|
|
controllers = self.db_get_val('Bridge', self.br_name, 'controller')
|
|
controllers = [controllers] if isinstance(
|
|
controllers, uuid.UUID) else controllers
|
|
with self.ovsdb.transaction(check_error=True) as txn:
|
|
for controller_uuid in controllers:
|
|
txn.add(self.ovsdb.db_set('Controller',
|
|
controller_uuid, *attr))
|
|
|
|
def _set_egress_bw_limit_for_port(self, port_name, max_kbps,
|
|
max_burst_kbps):
|
|
with self.ovsdb.transaction(check_error=True) as txn:
|
|
txn.add(self.ovsdb.db_set('Interface', port_name,
|
|
('ingress_policing_rate', max_kbps)))
|
|
txn.add(self.ovsdb.db_set('Interface', port_name,
|
|
('ingress_policing_burst',
|
|
max_burst_kbps)))
|
|
|
|
def create_egress_bw_limit_for_port(self, port_name, max_kbps,
|
|
max_burst_kbps):
|
|
self._set_egress_bw_limit_for_port(
|
|
port_name, max_kbps, max_burst_kbps)
|
|
|
|
def get_egress_bw_limit_for_port(self, port_name):
|
|
|
|
max_kbps = self.db_get_val('Interface', port_name,
|
|
'ingress_policing_rate')
|
|
max_burst_kbps = self.db_get_val('Interface', port_name,
|
|
'ingress_policing_burst')
|
|
|
|
max_kbps = max_kbps or None
|
|
max_burst_kbps = max_burst_kbps or None
|
|
|
|
return max_kbps, max_burst_kbps
|
|
|
|
def delete_egress_bw_limit_for_port(self, port_name):
|
|
self._set_egress_bw_limit_for_port(
|
|
port_name, 0, 0)
|
|
|
|
def __enter__(self):
|
|
self.create()
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, exc_tb):
|
|
self.destroy()
|
|
|
|
|
|
class DeferredOVSBridge(object):
|
|
'''Deferred OVSBridge.
|
|
|
|
This class wraps add_flow, mod_flow and delete_flows calls to an OVSBridge
|
|
and defers their application until apply_flows call in order to perform
|
|
bulk calls. It wraps also ALLOWED_PASSTHROUGHS calls to avoid mixing
|
|
OVSBridge and DeferredOVSBridge uses.
|
|
This class can be used as a context, in such case apply_flows is called on
|
|
__exit__ except if an exception is raised.
|
|
This class is not thread-safe, that's why for every use a new instance
|
|
must be implemented.
|
|
'''
|
|
ALLOWED_PASSTHROUGHS = 'add_port', 'add_tunnel_port', 'delete_port'
|
|
|
|
def __init__(self, br, full_ordered=False,
|
|
order=('add', 'mod', 'del')):
|
|
'''Constructor.
|
|
|
|
:param br: wrapped bridge
|
|
:param full_ordered: Optional, disable flow reordering (slower)
|
|
:param order: Optional, define in which order flow are applied
|
|
'''
|
|
|
|
self.br = br
|
|
self.full_ordered = full_ordered
|
|
self.order = order
|
|
if not self.full_ordered:
|
|
self.weights = dict((y, x) for x, y in enumerate(self.order))
|
|
self.action_flow_tuples = []
|
|
|
|
def __getattr__(self, name):
|
|
if name in self.ALLOWED_PASSTHROUGHS:
|
|
return getattr(self.br, name)
|
|
raise AttributeError(name)
|
|
|
|
def add_flow(self, **kwargs):
|
|
self.action_flow_tuples.append(('add', kwargs))
|
|
|
|
def mod_flow(self, **kwargs):
|
|
self.action_flow_tuples.append(('mod', kwargs))
|
|
|
|
def delete_flows(self, **kwargs):
|
|
self.action_flow_tuples.append(('del', kwargs))
|
|
|
|
def apply_flows(self):
|
|
action_flow_tuples = self.action_flow_tuples
|
|
self.action_flow_tuples = []
|
|
if not action_flow_tuples:
|
|
return
|
|
|
|
if not self.full_ordered:
|
|
action_flow_tuples.sort(key=lambda af: self.weights[af[0]])
|
|
|
|
grouped = itertools.groupby(action_flow_tuples,
|
|
key=operator.itemgetter(0))
|
|
itemgetter_1 = operator.itemgetter(1)
|
|
for action, action_flow_list in grouped:
|
|
flows = list(map(itemgetter_1, action_flow_list))
|
|
self.br.do_action_flows(action, flows)
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, traceback):
|
|
if exc_type is None:
|
|
self.apply_flows()
|
|
else:
|
|
LOG.exception(_LE("OVS flows could not be applied on bridge %s"),
|
|
self.br.br_name)
|
|
|
|
|
|
def _build_flow_expr_str(flow_dict, cmd):
|
|
flow_expr_arr = []
|
|
actions = None
|
|
|
|
if cmd == 'add':
|
|
flow_expr_arr.append("hard_timeout=%s" %
|
|
flow_dict.pop('hard_timeout', '0'))
|
|
flow_expr_arr.append("idle_timeout=%s" %
|
|
flow_dict.pop('idle_timeout', '0'))
|
|
flow_expr_arr.append("priority=%s" %
|
|
flow_dict.pop('priority', '1'))
|
|
elif 'priority' in flow_dict:
|
|
msg = _("Cannot match priority on flow deletion or modification")
|
|
raise exceptions.InvalidInput(error_message=msg)
|
|
|
|
if cmd != 'del':
|
|
if "actions" not in flow_dict:
|
|
msg = _("Must specify one or more actions on flow addition"
|
|
" or modification")
|
|
raise exceptions.InvalidInput(error_message=msg)
|
|
actions = "actions=%s" % flow_dict.pop('actions')
|
|
|
|
for key, value in six.iteritems(flow_dict):
|
|
if key == 'proto':
|
|
flow_expr_arr.append(value)
|
|
else:
|
|
flow_expr_arr.append("%s=%s" % (key, str(value)))
|
|
|
|
if actions:
|
|
flow_expr_arr.append(actions)
|
|
|
|
return ','.join(flow_expr_arr)
|