2 # Copyright (c) 2009, 2010, 2011, 2012, 2013 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.
36 import ovs.unixctl.server
38 vlog = ovs.vlog.Vlog("ovs-xapi-sync")
45 def unixctl_exit(conn, unused_argv, unused_aux):
51 def unixctl_flush_cache(conn, unused_argv, unused_aux):
57 # Set up a session to interact with XAPI.
59 # On system start-up, OVS comes up before XAPI, so we can't log into the
60 # session until later. Try to do this on-demand, since we won't
61 # actually do anything interesting until XAPI is up.
64 if session is not None:
68 session = XenAPI.xapi_local()
69 session.xenapi.login_with_password("", "")
70 except XenAPI.Failure, e:
72 vlog.warn("Couldn't login to XAPI (%s)" % e)
78 def get_network_by_bridge(br_name):
79 if not init_session():
80 vlog.warn("Failed to get bridge id %s because"
81 " XAPI session could not be initialized" % br_name)
84 recs = session.xenapi.network.get_all_records_where('field "bridge"="%s"' % br_name)
86 return recs.values()[0]
90 # There are possibilities when multiple xs-network-uuids are set for a bridge.
91 # In cases like that, we should choose the bridge-id associated with the bridge
93 def get_single_bridge_id(bridge_ids, br_name, default=None):
96 rec = get_network_by_bridge(br_name)
97 if rec and rec['uuid'] in bridge_ids:
100 vlog.warn("Failed to get a single bridge id from Xapi.")
104 # By default, the "bridge-id" external id in the Bridge table is the
105 # same as "xs-network-uuids". This may be overridden by defining a
106 # "nicira-bridge-id" key in the "other_config" field of the network
107 # record of XAPI. If nicira-bridge-id is undefined returns default.
108 # On error returns None.
109 def get_bridge_id(br_name, default=None):
110 rec = get_network_by_bridge(br_name)
112 return rec['other_config'].get('nicira-bridge-id', default)
116 # By default, the "iface-id" external id in the Interface table is the
117 # same as "xs-vif-uuid". This may be overridden by defining a
118 # "nicira-iface-id" key in the "other_config" field of the VIF
120 def get_iface_id(if_name, xs_vif_uuid):
121 if not if_name.startswith("vif") and not if_name.startswith("tap"):
122 # Treat whatever was passed into 'xs_vif_uuid' as a default
123 # value for non-VIFs.
126 if not init_session():
127 vlog.warn("Failed to get interface id %s because"
128 " XAPI session could not be initialized" % if_name)
132 vif = session.xenapi.VIF.get_by_uuid(xs_vif_uuid)
133 rec = session.xenapi.VIF.get_record(vif)
134 return rec['other_config'].get('nicira-iface-id', xs_vif_uuid)
135 except XenAPI.Failure:
136 vlog.warn("Could not find XAPI entry for VIF %s" % if_name)
140 # By default, the "vm-id" external id in the Interface table is the
141 # same as "xs-vm-uuid". This may be overridden by defining a
142 # "nicira-vm-id" key in the "other_config" field of the VM
144 def get_vm_id(if_name, xs_vm_uuid):
145 if not if_name.startswith("vif") and not if_name.startswith("tap"):
146 # Treat whatever was passed into 'xs_vm_uuid' as a default
147 # value for non-VIFs.
150 if not init_session():
151 vlog.warn("Failed to get vm id for interface id %s because"
152 " XAPI session could not be initialized" % if_name)
156 vm = session.xenapi.VM.get_by_uuid(xs_vm_uuid)
157 rec = session.xenapi.VM.get_record(vm)
158 return rec['other_config'].get('nicira-vm-id', xs_vm_uuid)
159 except XenAPI.Failure:
160 vlog.warn("Could not find XAPI entry for VIF %s" % if_name)
164 def set_or_delete(d, key, value):
170 if d.get(key) != value:
176 def set_external_id(row, key, value):
177 row.verify("external_ids")
178 external_ids = row.external_ids
179 if set_or_delete(external_ids, key, value):
180 row.external_ids = external_ids
183 # XenServer does not call interface-reconfigure on internal networks,
184 # which is where the fail-mode would normally be set.
185 def update_fail_mode(row):
186 rec = get_network_by_bridge(row.name)
190 fail_mode = rec['other_config'].get('vswitch-controller-fail-mode')
193 pools = session.xenapi.pool.get_all()
195 prec = session.xenapi.pool.get_record(pools[0])
196 fail_mode = prec['other_config'].get(
197 'vswitch-controller-fail-mode')
199 if fail_mode not in ['standalone', 'secure']:
200 fail_mode = 'standalone'
202 row.verify("fail_mode")
203 if row.fail_mode != fail_mode:
204 row.fail_mode = fail_mode
207 def update_in_band_mgmt(row):
208 rec = get_network_by_bridge(row.name)
212 dib = rec['other_config'].get('vswitch-disable-in-band')
214 row.verify("other_config")
215 other_config = row.other_config
216 if dib and dib not in ['true', 'false']:
217 vlog.warn('"%s" isn\'t a valid setting for '
218 "other_config:disable-in-band on %s" % (dib, row.name))
219 elif set_or_delete(other_config, 'disable-in-band', dib):
220 row.other_config = other_config
224 global flush_cache, xapi_down
226 parser = argparse.ArgumentParser()
227 parser.add_argument("database", metavar="DATABASE",
228 help="A socket on which ovsdb-server is listening.")
229 parser.add_argument("--root-prefix", metavar="DIR", default='',
230 help="Use DIR as alternate root directory"
233 ovs.vlog.add_args(parser)
234 ovs.daemon.add_args(parser)
235 args = parser.parse_args()
236 ovs.vlog.handle_args(args)
237 ovs.daemon.handle_args(args)
239 remote = args.database
240 schema_helper = ovs.db.idl.SchemaHelper()
241 schema_helper.register_columns("Bridge", ["name", "external_ids",
242 "other_config", "fail_mode"])
243 schema_helper.register_columns("Interface", ["name", "external_ids"])
244 idl = ovs.db.idl.Idl(remote, schema_helper)
246 ovs.daemon.daemonize()
248 ovs.unixctl.command_register("exit", "", 0, 0, unixctl_exit, None)
249 ovs.unixctl.command_register("flush-cache", "", 0, 0, unixctl_flush_cache,
251 error, unixctl_server = ovs.unixctl.server.UnixctlServer.create(None)
253 ovs.util.ovs_fatal(error, "could not create unixctl server", vlog)
255 # This daemon is usually started before XAPI, but to complete our
256 # tasks, we need it. Wait here until it's up.
257 cookie_file = args.root_prefix + "/var/run/xapi_init_complete.cookie"
258 while not os.path.exists(cookie_file):
261 bridges = {} # Map from bridge name to nicira-bridge-id
262 iface_ids = {} # Map from xs-vif-uuid to iface-id
263 vm_ids = {} # Map from xs-vm-uuid to vm-id
264 seqno = idl.change_seqno # Sequence number when we last processed the db
271 if not xapi_down and not flush_cache and seqno == idl.change_seqno:
272 poller = ovs.poller.Poller()
273 unixctl_server.wait(poller)
279 vlog.warn("Xapi is probably down. Retry again after a second.")
284 vlog.info("Flushing cache as the result of unixctl.")
289 seqno = idl.change_seqno
291 txn = ovs.db.idl.Transaction(idl)
294 for row in idl.tables["Bridge"].rows.itervalues():
295 bridge_id = bridges.get(row.name)
296 if bridge_id is None:
297 # Configure the new bridge.
298 update_fail_mode(row)
299 update_in_band_mgmt(row)
301 # Get the correct bridge_id, if we can.
302 bridge_id = get_bridge_id(row.name)
303 if bridge_id is None:
304 xs_network_uuids = row.external_ids.get("xs-network-uuids")
306 bridge_ids = xs_network_uuids.split(";")
307 if len(bridge_ids) == 1:
308 bridge_id = bridge_ids[0]
310 bridge_id = get_single_bridge_id(bridge_ids,
312 set_external_id(row, "bridge-id", bridge_id)
314 if bridge_id is not None:
315 new_bridges[row.name] = bridge_id
316 bridges = new_bridges
319 for row in idl.tables["Interface"].rows.itervalues():
320 iface_by_name[row.name] = row
324 for row in idl.tables["Interface"].rows.itervalues():
325 # Match up paired vif and tap devices.
326 if row.name.startswith("vif"):
328 tap = iface_by_name.get("tap%s" % row.name[3:])
329 elif row.name.startswith("tap"):
331 vif = iface_by_name.get("vif%s" % row.name[3:])
335 # Several tap external-ids need to be copied from the vif.
336 if row == tap and vif:
337 keys = ["attached-mac",
342 set_external_id(row, k, vif.external_ids.get(k))
344 # Map from xs-vif-uuid to iface-id.
346 # (A tap's xs-vif-uuid comes from its vif. That falls out
347 # naturally from the copy loop above.)
348 xvu = row.external_ids.get("xs-vif-uuid")
350 iface_id = (new_iface_ids.get(xvu)
351 or iface_ids.get(xvu)
352 or get_iface_id(row.name, xvu))
353 new_iface_ids[xvu] = iface_id
355 # No xs-vif-uuid therefore no iface-id.
357 set_external_id(row, "iface-id", iface_id)
359 # Map from xs-vm-uuid to vm-id.
360 xvmu = row.external_ids.get("xs-vm-uuid")
362 vm_id = (new_vm_ids.get(xvmu)
364 or get_vm_id(row.name, xvmu))
365 new_vm_ids[xvmu] = vm_id
368 set_external_id(row, "vm-id", vm_id)
370 # When there's a vif and a tap, the tap is active (used for
371 # traffic). When there's just a vif, the vif is active.
373 # A tap on its own shouldn't happen, and we don't know
374 # anything about other kinds of devices, so we don't use
375 # an iface-status for those devices at all.
377 set_external_id(tap, "iface-status", "active")
378 set_external_id(vif, "iface-status", "inactive")
380 set_external_id(vif, "iface-status", "active")
382 set_external_id(row, "iface-status", None)
383 iface_ids = new_iface_ids
386 txn.add_comment("ovs-xapi-sync: Updating records from XAPI")
389 unixctl_server.close()
393 if __name__ == '__main__':
397 # Let system.exit() calls complete normally
400 vlog.exception("traceback")
401 sys.exit(ovs.daemon.RESTART_EXIT_CODE)