100 lines
4.2 KiB
Python
100 lines
4.2 KiB
Python
# Copyright (C) 2014,2015 VA Linux Systems Japan K.K.
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# Copyright (C) 2014,2015 YAMAMOTO Takashi <yamamoto at valinux co jp>
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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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from oslo_log import log as logging
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from oslo_utils import excutils
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from neutron.agent.common import ovs_lib
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from neutron.plugins.ml2.drivers.openvswitch.agent.common import constants \
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as ovs_consts
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from neutron.plugins.ml2.drivers.openvswitch.agent.openflow \
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import br_cookie
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from neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native \
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import ofswitch
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LOG = logging.getLogger(__name__)
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class OVSAgentBridge(ofswitch.OpenFlowSwitchMixin,
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br_cookie.OVSBridgeCookieMixin, ovs_lib.OVSBridge):
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"""Common code for bridges used by OVS agent"""
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_cached_dpid = None
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def _get_dp(self):
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"""Get (dp, ofp, ofpp) tuple for the switch.
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A convenient method for openflow message composers.
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"""
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while True:
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if self._cached_dpid is None:
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dpid = self.get_datapath_id()
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LOG.info("Bridge %(br_name)s has datapath-ID %(dpid)s",
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{"br_name": self.br_name, "dpid": dpid})
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if dpid is None:
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raise RuntimeError("Unknown datapath id.")
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self._cached_dpid = int(dpid, 16)
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try:
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dp = self._get_dp_by_dpid(self._cached_dpid)
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return dp, dp.ofproto, dp.ofproto_parser
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except RuntimeError:
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with excutils.save_and_reraise_exception() as ctx:
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# Retry if dpid has been changed.
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# NOTE(yamamoto): Open vSwitch change its dpid on
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# some events.
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# REVISIT(yamamoto): Consider to set dpid statically.
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new_dpid = int(self.get_datapath_id(), 16)
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if new_dpid != self._cached_dpid:
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LOG.info("Bridge %(br_name)s changed its "
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"datapath-ID from %(old)x to %(new)x", {
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"br_name": self.br_name,
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"old": self._cached_dpid,
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"new": new_dpid,
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})
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ctx.reraise = False
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self._cached_dpid = new_dpid
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def setup_controllers(self, conf):
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controllers = [
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"tcp:%(address)s:%(port)s" % {
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"address": conf.OVS.of_listen_address,
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"port": conf.OVS.of_listen_port,
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}
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]
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self.add_protocols(ovs_consts.OPENFLOW13)
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self.set_controller(controllers)
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# NOTE(ivc): Force "out-of-band" controller connection mode (see
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# "In-Band Control" [1]).
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#
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# By default openvswitch uses "in-band" controller connection mode
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# which adds hidden OpenFlow rules (only visible by issuing ovs-appctl
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# bridge/dump-flows <br>) and leads to a network loop on br-tun. As of
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# now the OF controller is hosted locally with OVS which fits the
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# "out-of-band" mode. If the remote OF controller is ever to be
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# supported by openvswitch agent in the future, "In-Band Control" [1]
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# should be taken into consideration for physical bridge only, but
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# br-int and br-tun must be configured with the "out-of-band"
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# controller connection mode.
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#
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# [1] https://github.com/openvswitch/ovs/blob/master/DESIGN.md
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self.set_controllers_connection_mode("out-of-band")
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self.set_controllers_inactivity_probe(conf.OVS.of_inactivity_probe)
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def drop_port(self, in_port):
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self.install_drop(priority=2, in_port=in_port)
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