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# Copyright 2014-2015 Canonical Limited.
#
# 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.
''' Helpers for interacting with OpenvSwitch '''
import subprocess
import os
import six
from charmhelpers.fetch import apt_install
from charmhelpers.core.hookenv import (
log, WARNING, INFO, DEBUG
)
from charmhelpers.core.host import (
service
)
BRIDGE_TEMPLATE = """\
# This veth pair is required when neutron data-port is mapped to an existing linux bridge. lp:1635067
auto {linuxbridge_port}
iface {linuxbridge_port} inet manual
pre-up ip link add name {linuxbridge_port} type veth peer name {ovsbridge_port}
pre-up ip link set {ovsbridge_port} master {bridge}
pre-up ip link set {ovsbridge_port} up
up ip link set {linuxbridge_port} up
down ip link del {linuxbridge_port}
"""
def add_bridge(name, datapath_type=None):
''' Add the named bridge to openvswitch '''
log('Creating bridge {}'.format(name))
cmd = ["ovs-vsctl", "--", "--may-exist", "add-br", name]
if datapath_type is not None:
cmd += ['--', 'set', 'bridge', name,
'datapath_type={}'.format(datapath_type)]
subprocess.check_call(cmd)
def del_bridge(name):
''' Delete the named bridge from openvswitch '''
log('Deleting bridge {}'.format(name))
subprocess.check_call(["ovs-vsctl", "--", "--if-exists", "del-br", name])
def add_bridge_port(name, port, promisc=False):
''' Add a port to the named openvswitch bridge '''
log('Adding port {} to bridge {}'.format(port, name))
subprocess.check_call(["ovs-vsctl", "--", "--may-exist", "add-port",
name, port])
subprocess.check_call(["ip", "link", "set", port, "up"])
if promisc:
subprocess.check_call(["ip", "link", "set", port, "promisc", "on"])
else:
subprocess.check_call(["ip", "link", "set", port, "promisc", "off"])
def del_bridge_port(name, port):
''' Delete a port from the named openvswitch bridge '''
log('Deleting port {} from bridge {}'.format(port, name))
subprocess.check_call(["ovs-vsctl", "--", "--if-exists", "del-port",
name, port])
subprocess.check_call(["ip", "link", "set", port, "down"])
subprocess.check_call(["ip", "link", "set", port, "promisc", "off"])
def add_ovsbridge_linuxbridge(name, bridge):
''' Add linux bridge to the named openvswitch bridge
:param name: Name of ovs bridge to be added to Linux bridge
:param bridge: Name of Linux bridge to be added to ovs bridge
:returns: True if veth is added between ovs bridge and linux bridge,
False otherwise'''
try:
import netifaces
except ImportError:
if six.PY2:
apt_install('python-netifaces', fatal=True)
else:
apt_install('python3-netifaces', fatal=True)
import netifaces
ovsbridge_port = "veth-" + name
linuxbridge_port = "veth-" + bridge
log('Adding linuxbridge {} to ovsbridge {}'.format(bridge, name),
level=INFO)
interfaces = netifaces.interfaces()
for interface in interfaces:
if interface == ovsbridge_port or interface == linuxbridge_port:
log('Interface {} already exists'.format(interface), level=INFO)
return
with open('/etc/network/interfaces.d/{}.cfg'.format(
linuxbridge_port), 'w') as config:
config.write(BRIDGE_TEMPLATE.format(linuxbridge_port=linuxbridge_port,
ovsbridge_port=ovsbridge_port,
bridge=bridge))
subprocess.check_call(["ifup", linuxbridge_port])
add_bridge_port(name, linuxbridge_port)
def is_linuxbridge_interface(port):
''' Check if the interface is a linuxbridge bridge
:param port: Name of an interface to check whether it is a Linux bridge
:returns: True if port is a Linux bridge'''
if os.path.exists('/sys/class/net/' + port + '/bridge'):
log('Interface {} is a Linux bridge'.format(port), level=DEBUG)
return True
else:
log('Interface {} is not a Linux bridge'.format(port), level=DEBUG)
return False
def set_manager(manager):
''' Set the controller for the local openvswitch '''
log('Setting manager for local ovs to {}'.format(manager))
subprocess.check_call(['ovs-vsctl', 'set-manager',
'ssl:{}'.format(manager)])
CERT_PATH = '/etc/openvswitch/ovsclient-cert.pem'
def get_certificate():
''' Read openvswitch certificate from disk '''
if os.path.exists(CERT_PATH):
log('Reading ovs certificate from {}'.format(CERT_PATH))
with open(CERT_PATH, 'r') as cert:
full_cert = cert.read()
begin_marker = "-----BEGIN CERTIFICATE-----"
end_marker = "-----END CERTIFICATE-----"
begin_index = full_cert.find(begin_marker)
end_index = full_cert.rfind(end_marker)
if end_index == -1 or begin_index == -1:
raise RuntimeError("Certificate does not contain valid begin"
" and end markers.")
full_cert = full_cert[begin_index:(end_index + len(end_marker))]
return full_cert
else:
log('Certificate not found', level=WARNING)
return None
def full_restart():
''' Full restart and reload of openvswitch '''
if os.path.exists('/etc/init/openvswitch-force-reload-kmod.conf'):
service('start', 'openvswitch-force-reload-kmod')
else:
service('force-reload-kmod', 'openvswitch-switch')
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