2 # Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at:
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
17 # A daemon to monitor the external_ids columns of the Bridge and
18 # Interface OVSDB tables for changes that require interrogating XAPI.
19 # Its responsibilities include:
21 # - Set the "bridge-id" key in the Bridge table.
22 # - Set the "iface-id" key in the Interface table.
23 # - Set the fail-mode on internal bridges.
33 from ovs.db import error
34 from ovs.db import types
38 import ovs.unixctl.server
40 vlog = ovs.vlog.Vlog("ovs-xapi-sync")
46 def unixctl_exit(conn, unused_argv, unused_aux):
52 def unixctl_flush_cache(conn, unused_argv, unused_aux):
58 # Set up a session to interact with XAPI.
60 # On system start-up, OVS comes up before XAPI, so we can't log into the
61 # session until later. Try to do this on-demand, since we won't
62 # actually do anything interesting until XAPI is up.
65 if session is not None:
69 session = XenAPI.xapi_local()
70 session.xenapi.login_with_password("", "")
71 except XenAPI.Failure, e:
73 vlog.warn("Couldn't login to XAPI (%s)" % e)
79 def get_network_by_bridge(br_name):
80 if not init_session():
81 vlog.warn("Failed to get bridge id %s because"
82 " XAPI session could not be initialized" % br_name)
85 recs = session.xenapi.network.get_all_records_where('field "bridge"="%s"' % br_name)
87 return recs.values()[0]
91 # There are possibilities when multiple xs-network-uuids are set for a bridge.
92 # In cases like that, we should choose the bridge-id whose PIF does not have a
93 # VLAN associated with it.
94 def get_single_bridge_id(bridge_ids, default=None):
95 if not init_session():
96 vlog.warn("Failed to get single bridge id from %s because"
97 "XAPI session could not be initialized" % bridge_ids)
100 for bridge_id in bridge_ids:
102 recs = session.xenapi.network.get_all_records_where(\
103 'field "uuid"="%s"' % bridge_id)
105 pifs = recs.values()[0]['PIFs']
108 rec = session.xenapi.PIF.get_record(pif)
109 if rec['VLAN'] == '-1':
111 except XenAPI.Failure:
112 vlog.warn("Could not find XAPI entry for PIF %s" % pif)
115 except XenAPI.Failure:
116 vlog.warn("Could not find XAPI entry for bridge_id %s" % bridge_id)
121 # By default, the "bridge-id" external id in the Bridge table is the
122 # same as "xs-network-uuids". This may be overridden by defining a
123 # "nicira-bridge-id" key in the "other_config" field of the network
124 # record of XAPI. If nicira-bridge-id is undefined returns default.
125 # On error returns None.
126 def get_bridge_id(br_name, default=None):
127 rec = get_network_by_bridge(br_name)
129 return rec['other_config'].get('nicira-bridge-id', default)
133 # By default, the "iface-id" external id in the Interface table is the
134 # same as "xs-vif-uuid". This may be overridden by defining a
135 # "nicira-iface-id" key in the "other_config" field of the VIF
137 def get_iface_id(if_name, xs_vif_uuid):
138 if not if_name.startswith("vif") and not if_name.startswith("tap"):
139 # Treat whatever was passed into 'xs_vif_uuid' as a default
140 # value for non-VIFs.
143 if not init_session():
144 vlog.warn("Failed to get interface id %s because"
145 " XAPI session could not be initialized" % if_name)
149 vif = session.xenapi.VIF.get_by_uuid(xs_vif_uuid)
150 rec = session.xenapi.VIF.get_record(vif)
151 return rec['other_config'].get('nicira-iface-id', xs_vif_uuid)
152 except XenAPI.Failure:
153 vlog.warn("Could not find XAPI entry for VIF %s" % if_name)
157 # By default, the "vm-id" external id in the Interface table is the
158 # same as "xs-vm-uuid". This may be overridden by defining a
159 # "nicira-vm-id" key in the "other_config" field of the VM
161 def get_vm_id(if_name, xs_vm_uuid):
162 if not if_name.startswith("vif") and not if_name.startswith("tap"):
163 # Treat whatever was passed into 'xs_vm_uuid' as a default
164 # value for non-VIFs.
167 if not init_session():
168 vlog.warn("Failed to get vm id for interface id %s because"
169 " XAPI session could not be initialized" % if_name)
173 vm = session.xenapi.VM.get_by_uuid(xs_vm_uuid)
174 rec = session.xenapi.VM.get_record(vm)
175 return rec['other_config'].get('nicira-vm-id', xs_vm_uuid)
176 except XenAPI.Failure:
177 vlog.warn("Could not find XAPI entry for VIF %s" % if_name)
181 def set_or_delete(d, key, value):
187 if d.get(key) != value:
193 def set_external_id(row, key, value):
194 row.verify("external_ids")
195 external_ids = row.external_ids
196 if set_or_delete(external_ids, key, value):
197 row.external_ids = external_ids
200 # XenServer does not call interface-reconfigure on internal networks,
201 # which is where the fail-mode would normally be set.
202 def update_fail_mode(row):
203 rec = get_network_by_bridge(row.name)
207 fail_mode = rec['other_config'].get('vswitch-controller-fail-mode')
210 pools = session.xenapi.pool.get_all()
212 prec = session.xenapi.pool.get_record(pools[0])
213 fail_mode = prec['other_config'].get(
214 'vswitch-controller-fail-mode')
216 if fail_mode not in ['standalone', 'secure']:
217 fail_mode = 'standalone'
219 row.verify("fail_mode")
220 if row.fail_mode != fail_mode:
221 row.fail_mode = fail_mode
224 def update_in_band_mgmt(row):
225 rec = get_network_by_bridge(row.name)
229 dib = rec['other_config'].get('vswitch-disable-in-band')
231 row.verify("other_config")
232 other_config = row.other_config
233 if dib and dib not in ['true', 'false']:
234 vlog.warn('"%s" isn\'t a valid setting for '
235 "other_config:disable-in-band on %s" % (dib, row.name))
236 elif set_or_delete(other_config, 'disable-in-band', dib):
237 row.other_config = other_config
243 parser = argparse.ArgumentParser()
244 parser.add_argument("database", metavar="DATABASE",
245 help="A socket on which ovsdb-server is listening.")
246 parser.add_argument("--root-prefix", metavar="DIR", default='',
247 help="Use DIR as alternate root directory"
250 ovs.vlog.add_args(parser)
251 ovs.daemon.add_args(parser)
252 args = parser.parse_args()
253 ovs.vlog.handle_args(args)
254 ovs.daemon.handle_args(args)
256 remote = args.database
257 schema_helper = ovs.db.idl.SchemaHelper()
258 schema_helper.register_columns("Bridge", ["name", "external_ids",
259 "other_config", "fail_mode"])
260 schema_helper.register_columns("Interface", ["name", "external_ids"])
261 idl = ovs.db.idl.Idl(remote, schema_helper)
263 ovs.daemon.daemonize()
265 ovs.unixctl.command_register("exit", "", 0, 0, unixctl_exit, None)
266 ovs.unixctl.command_register("flush-cache", "", 0, 0, unixctl_flush_cache,
268 error, unixctl_server = ovs.unixctl.server.UnixctlServer.create(None)
270 ovs.util.ovs_fatal(error, "could not create unixctl server", vlog)
272 # This daemon is usually started before XAPI, but to complete our
273 # tasks, we need it. Wait here until it's up.
274 cookie_file = args.root_prefix + "/var/run/xapi_init_complete.cookie"
275 while not os.path.exists(cookie_file):
278 bridges = {} # Map from bridge name to nicira-bridge-id
279 iface_ids = {} # Map from xs-vif-uuid to iface-id
280 vm_ids = {} # Map from xs-vm-uuid to vm-id
281 seqno = idl.change_seqno # Sequence number when we last processed the db
288 if not flush_cache and seqno == idl.change_seqno:
289 poller = ovs.poller.Poller()
290 unixctl_server.wait(poller)
296 vlog.info("Flushing cache as the result of unixctl.")
301 seqno = idl.change_seqno
303 txn = ovs.db.idl.Transaction(idl)
306 for row in idl.tables["Bridge"].rows.itervalues():
307 if row.name in bridges:
308 nbd = bridges[row.name]
311 update_fail_mode(row)
312 update_in_band_mgmt(row)
313 nbd = get_bridge_id(row.name)
316 if bridge_id is None:
317 bridge_id = row.external_ids.get("xs-network-uuids")
318 if bridge_id and len(bridge_id.split(";")) > 1:
319 bridge_ids = bridge_id.split(";")
320 bridge_id = get_single_bridge_id(bridge_ids, bridge_ids[0])
322 if bridge_id is not None:
323 set_external_id(row, "bridge-id", bridge_id.split(";")[0])
325 new_bridges[row.name] = nbd
326 bridges = new_bridges
329 for row in idl.tables["Interface"].rows.itervalues():
330 iface_by_name[row.name] = row
334 for row in idl.tables["Interface"].rows.itervalues():
335 # Match up paired vif and tap devices.
336 if row.name.startswith("vif"):
338 tap = iface_by_name.get("tap%s" % row.name[3:])
339 elif row.name.startswith("tap"):
341 vif = iface_by_name.get("vif%s" % row.name[3:])
345 # Several tap external-ids need to be copied from the vif.
346 if row == tap and vif:
347 keys = ["attached-mac",
352 set_external_id(row, k, vif.external_ids.get(k))
354 # Map from xs-vif-uuid to iface-id.
356 # (A tap's xs-vif-uuid comes from its vif. That falls out
357 # naturally from the copy loop above.)
358 xvu = row.external_ids.get("xs-vif-uuid")
360 iface_id = (new_iface_ids.get(xvu)
361 or iface_ids.get(xvu)
362 or get_iface_id(row.name, xvu))
363 new_iface_ids[xvu] = iface_id
365 # No xs-vif-uuid therefore no iface-id.
367 set_external_id(row, "iface-id", iface_id)
369 # Map from xs-vm-uuid to vm-id.
370 xvmu = row.external_ids.get("xs-vm-uuid")
372 vm_id = (new_vm_ids.get(xvmu)
374 or get_vm_id(row.name, xvmu))
375 new_vm_ids[xvmu] = vm_id
378 set_external_id(row, "vm-id", vm_id)
380 # When there's a vif and a tap, the tap is active (used for
381 # traffic). When there's just a vif, the vif is active.
383 # A tap on its own shouldn't happen, and we don't know
384 # anything about other kinds of devices, so we don't use
385 # an iface-status for those devices at all.
387 set_external_id(tap, "iface-status", "active")
388 set_external_id(vif, "iface-status", "inactive")
390 set_external_id(vif, "iface-status", "active")
392 set_external_id(row, "iface-status", None)
393 iface_ids = new_iface_ids
396 txn.add_comment("ovs-xapi-sync: Updating records from XAPI")
399 unixctl_server.close()
403 if __name__ == '__main__':
407 # Let system.exit() calls complete normally
410 vlog.exception("traceback")
411 sys.exit(ovs.daemon.RESTART_EXIT_CODE)