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 Nicira Networks, 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 XenAPI
  26 import os
  27 import subprocess
  28 import syslog
  29 import re
  30
  31 vsctl="/usr/bin/ovs-vsctl"
  32 ofctl="/usr/bin/ovs-ofctl"
  33 cacert_filename="/etc/openvswitch/vswitchd.cacert"
  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 def update(session, args):
  44     # Refresh bridge network UUIDs in case this host joined or left a pool.
  45     script = "/opt/xensource/libexec/interface-reconfigure"
  46     try:
  47         retval = subprocess.call([script, "rewrite"])
  48         if retval != 0:
  49             syslog.syslog("%s exited with status %d" % (script, retval))
  50     except OSError, e:
  51         syslog.syslog("%s: failed to execute (%s)" % (script, e.strerror))
  52
  53     pools = session.xenapi.pool.get_all()
  54     # We assume there is only ever one pool...
  55     if len(pools) == 0:
  56         raise XenAPIPlugin.Failure("NO_POOL_FOR_HOST", [])
  57     if len(pools) > 1:
  58         raise XenAPIPlugin.Failure("MORE_THAN_ONE_POOL_FOR_HOST", [])
  59     new_controller = False
  60     pool = session.xenapi.pool.get_record(pools[0])
  61     controller = pool.get("vswitch_controller", "")
  62     ret_str = ""
  63     currentController = vswitchCurrentController()
  64     if controller == "" and currentController != "":
  65         delete_cacert()
  66         try:
  67             emergency_reset(session, None)
  68         except:
  69             pass
  70         removeControllerCfg()
  71         ret_str += "Successfully removed controller config.  "
  72     elif controller != currentController:
  73         delete_cacert()
  74         try:
  75             emergency_reset(session, None)
  76         except:
  77             pass
  78         setControllerCfg(controller)
  79         new_controller = True
  80         ret_str += "Successfully set controller to %s.  " % controller
  81
  82     try:
  83         pool_fail_mode = pool["other_config"]["vswitch-controller-fail-mode"]
  84     except KeyError, e:
  85         pool_fail_mode = None
  86
  87     bton = {}
  88
  89     for rec in session.xenapi.network.get_all_records().values():
  90         try:
  91             bton[rec['bridge']] = rec
  92         except KeyError:
  93             pass
  94
  95     # If new controller, get management MAC addresses from XAPI now
  96     # in case fail_mode set to secure which may affect XAPI access
  97     mgmt_bridge = None
  98     host_mgmt_mac = None
  99     host_mgmt_device = None
 100     pool_mgmt_macs = {}
 101     if new_controller:
 102         recs = session.xenapi.PIF.get_all_records_where('field "management"="true"')
 103         for rec in recs.itervalues():
 104             pool_mgmt_macs[rec.get('MAC')] = rec.get('device')
 105
 106     dib_changed = False
 107     fail_mode_changed = False
 108     for bridge in vswitchCfgQuery(['list-br']).split():
 109         network = bton[bridge]
 110         bridge = vswitchCfgQuery(['br-to-parent', bridge])
 111
 112         xapi_dib = network['other_config'].get('vswitch-disable-in-band')
 113         if not xapi_dib:
 114             xapi_dib = ''
 115
 116         ovs_dib = vswitchCfgQuery(['--', '--if-exists', 'get', 'Bridge',
 117                                    bridge,
 118                                    'other_config:disable-in-band']).strip('"')
 119
 120         # Do nothing if setting is invalid, and warn the user.
 121         if xapi_dib not in ['true', 'false', '']:
 122             ret_str += '"' + xapi_dib + '"' + \
 123                 ' is an invalid value for vswitch-disable-in-band on ' + \
 124                 bridge + '  '
 125
 126         # Change bridge disable-in-band option if XAPI and OVS states differ.
 127         elif xapi_dib != ovs_dib:
 128             # 'true' or 'false'
 129             if xapi_dib:
 130                 vswitchCfgMod(['--', 'set', 'Bridge', bridge,
 131                                'other_config:disable-in-band=' + xapi_dib])
 132             # '' or None
 133             else:
 134                 vswitchCfgMod(['--', 'remove', 'Bridge', bridge,
 135                                'other_config', 'disable-in-band'])
 136             dib_changed = True
 137
 138         # Change bridge fail_mode if XAPI state differs from OVS state.
 139         bridge_fail_mode = vswitchCfgQuery(["get", "Bridge",
 140             bridge, "fail_mode"]).strip('[]"')
 141
 142         try:
 143             fail_mode = bton[bridge]["other_config"]["vswitch-controller-fail-mode"]
 144         except KeyError, e:
 145             fail_mode = None
 146
 147         if fail_mode not in ['secure', 'standalone']:
 148             fail_mode = pool_fail_mode
 149
 150         if fail_mode != 'secure':
 151             fail_mode = 'standalone'
 152
 153         if bridge_fail_mode != fail_mode:
 154             vswitchCfgMod(['--', 'set', 'Bridge', bridge,
 155                 "fail_mode=%s" % fail_mode])
 156             fail_mode_changed = True
 157
 158         # Determine local mgmt MAC address if host being added to secure
 159         # pool so we can add default flows to allow management traffic
 160         if new_controller and fail_mode_changed and pool_fail_mode == "secure":
 161             oc = vswitchCfgQuery(["get", "Bridge", bridge, "other-config"])
 162             m = re.match('.*hwaddr="([0-9a-fA-F:].*)".*', oc)
 163             if m and m.group(1) in pool_mgmt_macs.keys():
 164                 mgmt_bridge = bridge
 165                 host_mgmt_mac = m.group(1)
 166                 host_mgmt_device = pool_mgmt_macs[host_mgmt_mac]
 167
 168     if host_mgmt_mac is not None and mgmt_bridge is not None and \
 169         host_mgmt_device is not None:
 170         tp = "idle_timeout=0,priority=0"
 171         port = vswitchCfgQuery(["get", "interface", host_mgmt_device, "ofport"])
 172         addFlow(mgmt_bridge, "%s,in_port=%s,arp,nw_proto=1,actions=local" % \
 173             (tp, port))
 174         addFlow(mgmt_bridge, "%s,in_port=local,arp,dl_src=%s,actions=%s" % \
 175             (tp, host_mgmt_mac, port))
 176         addFlow(mgmt_bridge, "%s,in_port=%s,dl_dst=%s,actions=local" % \
 177             (tp, port, host_mgmt_mac))
 178         addFlow(mgmt_bridge, "%s,in_port=local,dl_src=%s,actions=%s" % \
 179             (tp, host_mgmt_mac, port))
 180
 181     if dib_changed:
 182         ret_str += "Updated in-band management.  "
 183     if fail_mode_changed:
 184         ret_str += "Updated fail_mode.  "
 185
 186     if ret_str != '':
 187         return ret_str
 188     else:
 189         return "No change to configuration"
 190
 191 def vswitchCurrentController():
 192     controller = vswitchCfgQuery(["get-manager"])
 193     if controller == "":
 194         return controller
 195     if len(controller) < 4 or controller[0:4] != "ssl:":
 196         return controller
 197     else:
 198         return controller.split(':')[1]
 199
 200 def removeControllerCfg():
 201     vswitchCfgMod(["--", "del-manager",
 202                    "--", "del-ssl"])
 203
 204 def setControllerCfg(controller):
 205     # /etc/xensource/xapi-ssl.pem is mentioned twice below because it
 206     # contains both the private key and the certificate.
 207     vswitchCfgMod(["--", "del-manager",
 208                    "--", "del-ssl",
 209                    "--", "--bootstrap", "set-ssl",
 210                    "/etc/xensource/xapi-ssl.pem",
 211                    "/etc/xensource/xapi-ssl.pem",
 212                    cacert_filename,
 213                    "--", "set-manager", 'ssl:' + controller + ':6632'])
 214
 215 def vswitchCfgQuery(action_args):
 216     cmd = [vsctl, "--timeout=5", "-vANY:console:off"] + action_args
 217     output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
 218     if len(output) == 0 or output[0] == None:
 219         output = ""
 220     else:
 221         output = output[0].strip()
 222     return output
 223
 224 def vswitchCfgMod(action_args):
 225     cmd = [vsctl, "--timeout=5", "-vANY:console:off"] + action_args
 226     exitcode = subprocess.call(cmd)
 227     if exitcode != 0:
 228         raise XenAPIPlugin.Failure("VSWITCH_CONFIG_MOD_FAILURE",
 229                                    [ str(exitcode) , str(action_args) ])
 230
 231 def emergency_reset(session, args):
 232     cmd = [vsctl, "--timeout=5", "emer-reset"]
 233     exitcode = subprocess.call(cmd)
 234     if exitcode != 0:
 235         raise XenAPIPlugin.Failure("VSWITCH_EMER_RESET_FAILURE",
 236                                    [ str(exitcode) ])
 237
 238     return "Successfully reset configuration"
 239
 240 def addFlow(switch, flow):
 241     cmd = [ofctl, "add-flow", switch, flow]
 242     exitcode = subprocess.call(cmd)
 243     if exitcode != 0:
 244         raise XenAPIPlugin.Failure("VSWITCH_ADD_FLOW_FAILURE",
 245                                    [ str(exitcode) , str(switch), str(flow) ])
 246
 247 if __name__ == "__main__":
 248     XenAPIPlugin.dispatch({"update": update,
 249                            "emergency_reset": emergency_reset})