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# Copyright 2015-2017 Intel Corporation.
#
# 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.
"""VSwitch controller for Physical to Physical deployment
"""
import logging
import netaddr
from core.vswitch_controller import IVswitchController
from conf import settings
_FLOW_TEMPLATE = {
'idle_timeout': '0'
}
_PROTO_TCP = 6
_PROTO_UDP = 17
class VswitchControllerP2P(IVswitchController):
"""VSwitch controller for P2P deployment scenario.
Attributes:
_vswitch_class: The vSwitch class to be used.
_vswitch: The vSwitch object controlled by this controller
_deployment_scenario: A string describing the scenario to set-up in the
constructor.
"""
def __init__(self, vswitch_class, traffic):
"""Initializes up the prerequisites for the P2P deployment scenario.
:vswitch_class: the vSwitch class to be used.
"""
self._logger = logging.getLogger(__name__)
self._vswitch_class = vswitch_class
self._vswitch = vswitch_class()
self._deployment_scenario = "P2P"
self._logger.debug('Creation using ' + str(self._vswitch_class))
self._traffic = traffic.copy()
def setup(self):
"""Sets up the switch for p2p.
"""
self._logger.debug('Setup using ' + str(self._vswitch_class))
try:
self._vswitch.start()
bridge = settings.getValue('VSWITCH_BRIDGE_NAME')
self._vswitch.add_switch(bridge)
(_, _) = self._vswitch.add_phy_port(bridge)
(_, _) = self._vswitch.add_phy_port(bridge)
self._vswitch.del_flow(bridge)
# table#0 - flows designed to force 5 & 13 tuple matches go here
flow = {'table':'0', 'priority':'1', 'actions': ['goto_table:1']}
self._vswitch.add_flow(bridge, flow)
# table#1 - flows to route packets between ports goes here. The
# chosen port is communicated to subsequent tables by setting the
# metadata value to the egress port number
# configure flows according to the TC definition
flow_template = _FLOW_TEMPLATE.copy()
if self._traffic['flow_type'] == 'IP':
flow_template.update({'dl_type':'0x0800', 'nw_src':self._traffic['l3']['srcip'],
'nw_dst':self._traffic['l3']['dstip']})
flow = flow_template.copy()
flow.update({'table':'1', 'priority':'1', 'in_port':'1',
'actions': ['write_actions(output:2)', 'write_metadata:0x2',
'goto_table:2']})
self.process_flow_template(bridge, flow)
flow = flow_template.copy()
flow.update({'table':'1', 'priority':'1', 'in_port':'2',
'actions': ['write_actions(output:1)', 'write_metadata:0x1',
'goto_table:2']})
self.process_flow_template(bridge, flow)
# Frame modification table. Frame modification flow rules are
# isolated in this table so that they can be turned on or off
# without affecting the routing or tuple-matching flow rules.
flow = {'table':'2', 'priority':'1', 'actions': ['goto_table:3']}
self._vswitch.add_flow(bridge, flow)
# Egress table
# (TODO) Billy O'Mahony - the drop action here actually required in
# order to egress the packet. This is the subject of a thread on
# ovs-discuss 2015-06-30.
flow = {'table':'3', 'priority':'1', 'actions': ['drop']}
self._vswitch.add_flow(bridge, flow)
except:
self._vswitch.stop()
raise
def stop(self):
"""Tears down the switch created in setup().
"""
self._logger.debug('Stop using ' + str(self._vswitch_class))
self._vswitch.stop()
def __enter__(self):
self.setup()
def __exit__(self, type_, value, traceback):
self.stop()
def get_vswitch(self):
"""See IVswitchController for description
"""
return self._vswitch
def get_ports_info(self):
"""See IVswitchController for description
"""
self._logger.debug('get_ports_info using ' + str(self._vswitch_class))
return self._vswitch.get_ports(settings.getValue('VSWITCH_BRIDGE_NAME'))
def dump_vswitch_flows(self):
"""See IVswitchController for description
"""
self._vswitch.dump_flows(settings.getValue('VSWITCH_BRIDGE_NAME'))
def process_flow_template(self, bridge, flow_template):
"""Method adds flows into the vswitch based on given flow template
and configuration of multistream feature.
"""
if ('pre_installed_flows' in self._traffic and
self._traffic['pre_installed_flows'].lower() == 'yes' and
'multistream' in self._traffic and self._traffic['multistream'] > 0 and
'stream_type' in self._traffic):
# multistream feature is enabled and flows should be inserted into OVS
# so generate flows based on template and multistream configuration
if self._traffic['stream_type'] == 'L2':
# iterate through destimation MAC address
dst_mac_value = netaddr.EUI(self._traffic['l2']['dstmac']).value
for i in range(self._traffic['multistream']):
tmp_mac = netaddr.EUI(dst_mac_value + i)
tmp_mac.dialect = netaddr.mac_unix_expanded
flow_template.update({'dl_dst':tmp_mac})
# optimize flow insertion by usage of cache
self._vswitch.add_flow(bridge, flow_template, cache='on')
elif self._traffic['stream_type'] == 'L3':
# iterate through destimation IP address
dst_ip_value = netaddr.IPAddress(self._traffic['l3']['dstip']).value
for i in range(self._traffic['multistream']):
tmp_ip = netaddr.IPAddress(dst_ip_value + i)
flow_template.update({'dl_type':'0x0800', 'nw_dst':tmp_ip})
# optimize flow insertion by usage of cache
self._vswitch.add_flow(bridge, flow_template, cache='on')
elif self._traffic['stream_type'] == 'L4':
# read transport protocol from configuration and iterate through its destination port
proto = _PROTO_TCP if self._traffic['l3']['proto'].lower() == 'tcp' else _PROTO_UDP
for i in range(self._traffic['multistream']):
flow_template.update({'dl_type':'0x0800', 'nw_proto':proto, 'tp_dst':i})
# optimize flow insertion by usage of cache
self._vswitch.add_flow(bridge, flow_template, cache='on')
else:
self._logger.error('Stream type is set to uknown value %s', self._traffic['stream_type'])
# insert cached flows into the OVS
self._vswitch.add_flow(bridge, [], cache='flush')
else:
self._vswitch.add_flow(bridge, flow_template)
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