xenserver/etc_xapi.d_plugins_openvswitch-cfg-update

   1 #!/usr/bin/env python
   2 #
   3 # xapi plugin script to update the cache of configuration items in the
   4 # ovs-vswitchd configuration that are managed in the xapi database when
   5 # integrated with Citrix management tools.
   6
   7 # Copyright (C) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
   8 #
   9 # Licensed under the Apache License, Version 2.0 (the "License");
  10 # you may not use this file except in compliance with the License.
  11 # You may obtain a copy of the License at:
  12 #
  13 #     http://www.apache.org/licenses/LICENSE-2.0
  14 #
  15 # Unless required by applicable law or agreed to in writing, software
  16 # distributed under the License is distributed on an "AS IS" BASIS,
  17 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18 # See the License for the specific language governing permissions and
  19 # limitations under the License.
  20
  21 # TBD: - error handling needs to be improved.  Currently this can leave
  22 # TBD:   the system in a bad state if anything goes wrong.
  23
  24 import XenAPIPlugin
  25 import os
  26 import subprocess
  27 import syslog
  28 import re
  29
  30 vsctl = '/usr/bin/ovs-vsctl'
  31 ofctl = '/usr/bin/ovs-ofctl'
  32 cacert_filename = '/etc/openvswitch/vswitchd.cacert'
  33
  34
  35 # Delete the CA certificate, so that we go back to boot-strapping mode
  36 def delete_cacert():
  37     try:
  38         os.remove(cacert_filename)
  39     except OSError:
  40         # Ignore error if file doesn't exist
  41         pass
  42
  43
  44 def update(session, args):
  45     # Refresh bridge network UUIDs in case this host joined or left a pool.
  46     script = '/opt/xensource/libexec/interface-reconfigure'
  47     try:
  48         retval = subprocess.call([script, 'rewrite'])
  49         if retval != 0:
  50             syslog.syslog('%s exited with status %d' % (script, retval))
  51     except OSError, e:
  52         syslog.syslog('%s: failed to execute (%s)' % (script, e.strerror))
  53
  54     pools = session.xenapi.pool.get_all()
  55     # We assume there is only ever one pool...
  56     if len(pools) == 0:
  57         raise XenAPIPlugin.Failure('NO_POOL_FOR_HOST', [])
  58     if len(pools) > 1:
  59         raise XenAPIPlugin.Failure('MORE_THAN_ONE_POOL_FOR_HOST', [])
  60     new_controller = False
  61     pool = session.xenapi.pool.get_record(pools[0])
  62     controller = pool.get('vswitch_controller')
  63     ret_str = ''
  64     currentControllers = vswitchCurrentControllers()
  65
  66     if not controller and currentControllers:
  67         delete_cacert()
  68         try:
  69             emergency_reset(session, None)
  70         except:
  71             pass
  72         removeControllerCfg()
  73         ret_str += 'Successfully removed controller config.  '
  74     elif controller not in currentControllers:
  75         delete_cacert()
  76         try:
  77             emergency_reset(session, None)
  78         except:
  79             pass
  80         setControllerCfg(controller)
  81         new_controller = True
  82         ret_str += 'Successfully set controller to %s.  ' % controller
  83
  84     try:
  85         pool_fail_mode = pool['other_config']['vswitch-controller-fail-mode']
  86     except KeyError, e:
  87         pool_fail_mode = None
  88
  89     bton = {}
  90
  91     for rec in session.xenapi.network.get_all_records().values():
  92         try:
  93             bton[rec['bridge']] = rec
  94         except KeyError:
  95             pass
  96
  97     # If new controller, get management MAC addresses from XAPI now
  98     # in case fail_mode set to secure which may affect XAPI access
  99     mgmt_bridge = None
 100     host_mgmt_mac = None
 101     host_mgmt_device = None
 102     pool_mgmt_macs = {}
 103     if new_controller:
 104         query = 'field "management"="true"'
 105         recs = session.xenapi.PIF.get_all_records_where(query)
 106         for rec in recs.itervalues():
 107             pool_mgmt_macs[rec.get('MAC')] = rec.get('device')
 108
 109     dib_changed = False
 110     fail_mode_changed = False
 111     for bridge in vswitchCfgQuery(['list-br']).split():
 112         network = bton[bridge]
 113         bridge = vswitchCfgQuery(['br-to-parent', bridge])
 114
 115         xapi_dib = network['other_config'].get('vswitch-disable-in-band')
 116         if not xapi_dib:
 117             xapi_dib = ''
 118
 119         ovs_dib = vswitchCfgQuery(['--', '--if-exists', 'get', 'Bridge',
 120                                    bridge,
 121                                    'other_config:disable-in-band']).strip('"')
 122
 123         # Do nothing if setting is invalid, and warn the user.
 124         if xapi_dib not in ['true', 'false', '']:
 125             ret_str += '"' + xapi_dib + '"' + \
 126                 ' is an invalid value for vswitch-disable-in-band on ' + \
 127                 bridge + '  '
 128
 129         # Change bridge disable-in-band option if XAPI and OVS states differ.
 130         elif xapi_dib != ovs_dib:
 131             # 'true' or 'false'
 132             if xapi_dib:
 133                 vswitchCfgMod(['--', 'set', 'Bridge', bridge,
 134                                'other_config:disable-in-band=' + xapi_dib])
 135             # '' or None
 136             else:
 137                 vswitchCfgMod(['--', 'remove', 'Bridge', bridge,
 138                                'other_config', 'disable-in-band'])
 139             dib_changed = True
 140
 141         # Change bridge fail_mode if XAPI state differs from OVS state.
 142         bridge_fail_mode = vswitchCfgQuery(['get', 'Bridge',
 143                                             bridge, 'fail_mode']).strip('[]"')
 144
 145         try:
 146             other_config = bton[bridge]['other_config']
 147             fail_mode = other_config['vswitch-controller-fail-mode']
 148         except KeyError, e:
 149             fail_mode = None
 150
 151         if fail_mode not in ['secure', 'standalone']:
 152             fail_mode = pool_fail_mode
 153
 154         if fail_mode != 'secure':
 155             fail_mode = 'standalone'
 156
 157         if bridge_fail_mode != fail_mode:
 158             vswitchCfgMod(['--', 'set', 'Bridge', bridge,
 159                            'fail_mode=%s' % fail_mode])
 160             fail_mode_changed = True
 161
 162         # Determine local mgmt MAC address if host being added to secure
 163         # pool so we can add default flows to allow management traffic
 164         if new_controller and fail_mode_changed and pool_fail_mode == 'secure':
 165             oc = vswitchCfgQuery(['get', 'Bridge', bridge, 'other-config'])
 166             m = re.match('.*hwaddr="([0-9a-fA-F:].*)".*', oc)
 167             if m and m.group(1) in pool_mgmt_macs.keys():
 168                 mgmt_bridge = bridge
 169                 host_mgmt_mac = m.group(1)
 170                 host_mgmt_device = pool_mgmt_macs[host_mgmt_mac]
 171
 172     if (host_mgmt_mac is not None and mgmt_bridge is not None and
 173             host_mgmt_device is not None):
 174         tp = 'idle_timeout=0,priority=0'
 175         port = vswitchCfgQuery(['get', 'interface', host_mgmt_device,
 176                                 'ofport'])
 177
 178         addFlow(mgmt_bridge, '%s,in_port=%s,arp,nw_proto=1,actions=local' %
 179                 (tp, port))
 180         addFlow(mgmt_bridge, '%s,in_port=local,arp,dl_src=%s,actions=%s' %
 181                 (tp, host_mgmt_mac, port))
 182         addFlow(mgmt_bridge, '%s,in_port=%s,dl_dst=%s,actions=local' %
 183                 (tp, port, host_mgmt_mac))
 184         addFlow(mgmt_bridge, '%s,in_port=local,dl_src=%s,actions=%s' %
 185                 (tp, host_mgmt_mac, port))
 186
 187     if dib_changed:
 188         ret_str += 'Updated in-band management.  '
 189     if fail_mode_changed:
 190         ret_str += 'Updated fail_mode.  '
 191
 192     if ret_str != '':
 193         return ret_str
 194     else:
 195         return 'No change to configuration'
 196
 197
 198 def vswitchCurrentControllers():
 199     controllers = vswitchCfgQuery(['get-manager'])
 200
 201     def parse_controller(controller):
 202         if controller.startswith('ssl:'):
 203             return controller.split(':')[1]
 204
 205         return controller.split(':')[0]
 206
 207     return [parse_controller(controller)
 208             for controller in controllers.split('\n')
 209             if controller]
 210
 211
 212 def removeControllerCfg():
 213     vswitchCfgMod(['--', 'del-manager',
 214                    '--', 'del-ssl'])
 215
 216
 217 def setControllerCfg(controller):
 218     # /etc/xensource/xapi-ssl.pem is mentioned twice below because it
 219     # contains both the private key and the certificate.
 220     vswitchCfgMod(['--', 'del-manager',
 221                    '--', 'del-ssl',
 222                    '--', '--bootstrap', 'set-ssl',
 223                    '/etc/xensource/xapi-ssl.pem',
 224                    '/etc/xensource/xapi-ssl.pem',
 225                    cacert_filename,
 226                    '--', 'set-manager', 'ssl:' + controller + ':6632'])
 227
 228
 229 def vswitchCfgQuery(action_args):
 230     cmd = [vsctl, '-vconsole:off'] + action_args
 231     output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
 232     if len(output) == 0 or output[0] is None:
 233         output = ''
 234     else:
 235         output = output[0].strip()
 236     return output
 237
 238
 239 def vswitchCfgMod(action_args):
 240     cmd = [vsctl, '--timeout=5', '-vconsole:off'] + action_args
 241     exitcode = subprocess.call(cmd)
 242     if exitcode != 0:
 243         raise XenAPIPlugin.Failure('VSWITCH_CONFIG_MOD_FAILURE',
 244                                    [str(exitcode), str(action_args)])
 245
 246
 247 def emergency_reset(session, args):
 248     cmd = [vsctl, '--timeout=5', 'emer-reset']
 249     exitcode = subprocess.call(cmd)
 250     if exitcode != 0:
 251         raise XenAPIPlugin.Failure('VSWITCH_EMER_RESET_FAILURE',
 252                                    [str(exitcode)])
 253
 254     return 'Successfully reset configuration'
 255
 256
 257 def addFlow(switch, flow):
 258     cmd = [ofctl, 'add-flow', switch, flow]
 259     exitcode = subprocess.call(cmd)
 260     if exitcode != 0:
 261         raise XenAPIPlugin.Failure('VSWITCH_ADD_FLOW_FAILURE',
 262                                    [str(exitcode), str(switch), str(flow)])
 263
 264
 265 if __name__ == '__main__':
 266     XenAPIPlugin.dispatch({'update': update,
 267                            'emergency_reset': emergency_reset})