2 # Copyright (c) 2009, 2010, 2011 Nicira Networks
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.
26 import logging, logging.handlers
36 from ovs.db import error
37 from ovs.db import types
42 s_log = logging.getLogger("ovs-xapi-sync")
43 vsctl="/usr/bin/ovs-vsctl"
47 # Set up a session to interact with XAPI.
49 # On system start-up, OVS comes up before XAPI, so we can't log into the
50 # session until later. Try to do this on-demand, since we won't
51 # actually do anything interesting until XAPI is up.
54 if session is not None:
58 session = XenAPI.xapi_local()
59 session.xenapi.login_with_password("", "")
62 s_log.warning("Couldn't login to XAPI")
67 def get_network_by_bridge(br_name):
68 if not init_session():
69 s_log.warning("Failed to get bridge id %s because"
70 " XAPI session could not be initialized" % br_name)
73 for n in session.xenapi.network.get_all():
74 rec = session.xenapi.network.get_record(n)
75 if rec['bridge'] == br_name:
80 # By default, the "bridge-id" external id in the Bridge table is the
81 # same as "xs-network-uuids". This may be overridden by defining a
82 # "nicira-bridge-id" key in the "other_config" field of the network
83 # record of XAPI. If nicira-bridge-id is undefined returns default.
84 # On error returns None.
85 def get_bridge_id(br_name, default=None):
86 rec = get_network_by_bridge(br_name)
88 return rec['other_config'].get('nicira-bridge-id', default)
91 # By default, the "iface-id" external id in the Interface table is the
92 # same as "xs-vif-uuid". This may be overridden by defining a
93 # "nicira-iface-id" key in the "other_config" field of the VIF
95 def get_iface_id(if_name, xs_vif_uuid):
96 if not if_name.startswith("vif") and not if_name.startswith("tap"):
97 # Treat whatever was passed into 'xs_vif_uuid' as a default
101 if not init_session():
102 s_log.warning("Failed to get interface id %s because"
103 " XAPI session could not be initialized" % if_name)
107 vif = session.xenapi.VIF.get_by_uuid(xs_vif_uuid)
108 rec = session.xenapi.VIF.get_record(vif)
109 return rec['other_config'].get('nicira-iface-id', xs_vif_uuid)
110 except XenAPI.Failure:
111 s_log.warning("Could not find XAPI entry for VIF %s" % if_name)
114 def call_vsctl(args):
115 cmd = [vsctl, "--timeout=30", "-vANY:console:off"] + args
116 exitcode = subprocess.call(cmd)
118 s_log.warning("Couldn't call ovs-vsctl")
120 def set_or_delete(d, key, value):
126 if d.get(key) != value:
131 def set_external_id(row, key, value):
132 external_ids = row.external_ids
133 if set_or_delete(external_ids, key, value):
134 row.external_ids = external_ids
136 # XenServer does not call interface-reconfigure on internal networks,
137 # which is where the fail-mode would normally be set.
138 def update_fail_mode(row):
139 rec = get_network_by_bridge(row.name)
143 fail_mode = rec['other_config'].get('vswitch-controller-fail-mode')
146 pools = session.xenapi.pool.get_all()
148 prec = session.xenapi.pool.get_record(pools[0])
149 fail_mode = prec['other_config'].get('vswitch-controller-fail-mode')
151 if fail_mode not in ['standalone', 'secure']:
152 fail_mode = 'standalone'
154 if row.fail_mode != fail_mode:
155 row.fail_mode = fail_mode
157 def update_in_band_mgmt(row):
158 rec = get_network_by_bridge(row.name)
162 dib = rec['other_config'].get('vswitch-disable-in-band')
164 other_config = row.other_config
165 if dib and dib not in ['true', 'false']:
166 s_log.warning('"%s" isn\'t a valid setting for '
167 "other_config:disable-in-band on %s" % (dib, row.name))
168 elif set_or_delete(other_config, 'disable-in-band', dib):
169 row.other_config = other_config
171 def update_bridge_id(row):
172 id_ = get_bridge_id(row.name, row.external_ids.get("xs-network-uuids"))
176 set_external_id(row, "bridge-id", id_.split(";")[0])
178 def keep_table_columns(schema, table_name, columns):
179 table = schema.tables.get(table_name)
181 raise error.Error("schema has no %s table" % table_name)
184 for column_name in columns:
185 column = table.columns.get(column_name)
187 raise error.Error("%s table schema lacks %s column"
188 % (table_name, column_name))
189 new_columns[column_name] = column
190 table.columns = new_columns
193 def prune_schema(schema):
195 new_tables["Bridge"] = keep_table_columns(
196 schema, "Bridge", ("name", "external_ids", "other_config",
198 new_tables["Interface"] = keep_table_columns(
199 schema, "Interface", ("name", "external_ids"))
200 schema.tables = new_tables
203 print "usage: %s [OPTIONS] DATABASE" % sys.argv[0]
204 print "where DATABASE is a socket on which ovsdb-server is listening."
206 print "Other options:"
207 print " -h, --help display this help message"
210 def handler(signum, _):
212 if (signum == signal.SIGHUP):
218 l_handler = logging.handlers.RotatingFileHandler(
219 "/var/log/openvswitch/ovs-xapi-sync.log")
220 l_formatter = logging.Formatter('%(filename)s: %(levelname)s: %(message)s')
221 l_handler.setFormatter(l_formatter)
222 s_log.addHandler(l_handler)
223 s_log.setLevel(logging.INFO)
226 options, args = getopt.gnu_getopt(
227 argv[1:], 'h', ['help'] + ovs.daemon.LONG_OPTIONS)
228 except getopt.GetoptError, geo:
229 sys.stderr.write("%s: %s\n" % (ovs.util.PROGRAM_NAME, geo.msg))
232 for key, value in options:
233 if key in ['-h', '--help']:
235 elif not ovs.daemon.parse_opt(key, value):
236 sys.stderr.write("%s: unhandled option %s\n"
237 % (ovs.util.PROGRAM_NAME, key))
241 sys.stderr.write("%s: exactly one nonoption argument is required "
242 "(use --help for help)\n" % ovs.util.PROGRAM_NAME)
246 schema_file = "%s/vswitch.ovsschema" % ovs.dirs.PKGDATADIR
247 schema = ovs.db.schema.DbSchema.from_json(ovs.json.from_file(schema_file))
249 idl = ovs.db.idl.Idl(remote, schema)
251 ovs.daemon.daemonize()
253 # This daemon is usually started before XAPI, but to complete our
254 # tasks, we need it. Wait here until it's up.
255 while not os.path.exists("/var/run/xapi_init_complete.cookie"):
258 signal.signal(signal.SIGHUP, handler)
260 bridges = {} # Map from bridge name to xs_network_uuids
261 interfaces = {} # Map from interface name to
263 if not force_run and not idl.run():
264 poller = ovs.poller.Poller()
270 s_log.info("Forced to re-run as the result of a SIGHUP")
275 txn = ovs.db.idl.Transaction(idl)
278 for row in idl.tables["Bridge"].rows.itervalues():
279 old_xnu = bridges.get(row.name)
280 new_xnu = row.external_ids.get("xs-network-uuids", "")
283 update_fail_mode(row)
284 update_in_band_mgmt(row)
285 if new_xnu != old_xnu:
286 # New bridge or bridge's xs-network-uuids has changed.
287 update_bridge_id(row)
288 new_bridges[row.name] = new_xnu
289 bridges = new_bridges
292 for row in idl.tables["Interface"].rows.itervalues():
293 iface_by_name[row.name] = row
296 for row in idl.tables["Interface"].rows.itervalues():
297 # Match up paired vif and tap devices.
298 if row.name.startswith("vif"):
300 tap = iface_by_name.get("tap%s" % row.name[3:])
301 elif row.name.startswith("tap"):
303 vif = iface_by_name.get("vif%s" % row.name[3:])
307 # Several tap external-ids need to be copied from the vif.
308 if row == tap and vif:
309 keys = ["attached-mac",
314 set_external_id(row, k, vif.external_ids.get(k))
316 # If it's a new interface or its xs-vif-uuid has changed, then
317 # obtain the iface-id from XAPI.
319 # (A tap's xs-vif-uuid comes from its vif. That falls out
320 # naturally from the copy loop above.)
321 new_xvu = row.external_ids.get("xs-vif-uuid", "")
322 old_xvu = interfaces.get(row.name)
323 if old_xvu != new_xvu:
324 iface_id = get_iface_id(row.name, new_xvu)
325 if iface_id and row.external_ids.get("iface-id") != iface_id:
326 set_external_id(row, "iface-id", iface_id)
328 # When there's a vif and a tap, the tap is active (used for
329 # traffic). When there's just a vif, the vif is active.
331 # A tap on its own shouldn't happen, and we don't know
332 # anything about other kinds of devices, so we don't use
333 # an iface-status for those devices at all.
335 set_external_id(tap, "iface-status", "active")
336 set_external_id(vif, "iface-status", "inactive")
338 set_external_id(vif, "iface-status", "active")
340 set_external_id(row, "iface-status", None)
342 new_interfaces[row.name] = new_xvu
343 interfaces = new_interfaces
347 if __name__ == '__main__':
351 # Let system.exit() calls complete normally
354 s_log.exception("traceback")
355 sys.exit(ovs.daemon.RESTART_EXIT_CODE)