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#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2011 OpenStack LLC.
# 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.
"""
This script is used to configure base openvswitch flows for XenServer hosts.
"""
import os
import sys
from novalib import execute, execute_get_output
def main(command, phys_dev_name, bridge_name):
ovs_ofctl = lambda *rule: execute('/usr/bin/ovs-ofctl', *rule)
# always clear all flows first
ovs_ofctl('del-flows', bridge_name)
if command in ('online', 'reset'):
pnic_ofport = execute_get_output('/usr/bin/ovs-vsctl', 'get',
'Interface', phys_dev_name, 'ofport')
# these flows are lower priority than all VM-specific flows.
# allow all traffic from the physical NIC, as it is trusted (i.e.,
# from a filtered vif, or from the physical infrastructure)
ovs_ofctl('add-flow', bridge_name,
"priority=2,in_port=%s,actions=normal" % pnic_ofport)
# default drop
ovs_ofctl('add-flow', bridge_name, 'priority=1,actions=drop')
if __name__ == "__main__":
if len(sys.argv) != 4 or sys.argv[1] not in ('online', 'offline', 'reset'):
print sys.argv
script_name = os.path.basename(sys.argv[0])
print "This script configures base ovs flows."
print "usage: %s [online|offline|reset] phys-dev-name bridge-name" \
% script_name
print " ex: %s online eth0 xenbr0" % script_name
sys.exit(1)
else:
command, phys_dev_name, bridge_name = sys.argv[1:4]
main(command, phys_dev_name, bridge_name)
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