xenserver/opt_xensource_libexec_InterfaceReconfigureVswitch.py

   1 # Copyright (c) 2008,2009 Citrix Systems, Inc.
   2 # Copyright (c) 2009,2010 Nicira Networks.
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU Lesser General Public License as published
   6 # by the Free Software Foundation; version 2.1 only. with the special
   7 # exception on linking described in file LICENSE.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Lesser General Public License for more details.
  13 #
  14 from InterfaceReconfigure import *
  15 import re
  16
  17 #
  18 # Bare Network Devices -- network devices without IP configuration
  19 #
  20
  21 def netdev_down(netdev):
  22     """Bring down a bare network device"""
  23     if not netdev_exists(netdev):
  24         log("netdev: down: device %s does not exist, ignoring" % netdev)
  25         return
  26     run_command(["/sbin/ifconfig", netdev, 'down'])
  27
  28 def netdev_up(netdev, mtu=None):
  29     """Bring up a bare network device"""
  30     if not netdev_exists(netdev):
  31         raise Error("netdev: up: device %s does not exist" % netdev)
  32
  33     if mtu:
  34         mtu = ["mtu", mtu]
  35     else:
  36         mtu = []
  37
  38     run_command(["/sbin/ifconfig", netdev, 'up'] + mtu)
  39
  40 #
  41 # PIF miscellanea
  42 #
  43
  44 def pif_currently_in_use(pif):
  45     """Determine if a PIF is currently in use.
  46
  47     A PIF is determined to be currently in use if
  48     - PIF.currently-attached is true
  49     - Any bond master is currently attached
  50     - Any VLAN master is currently attached
  51     """
  52     rec = db().get_pif_record(pif)
  53     if rec['currently_attached']:
  54         log("configure_datapath: %s is currently attached" % (pif_netdev_name(pif)))
  55         return True
  56     for b in pif_get_bond_masters(pif):
  57         if pif_currently_in_use(b):
  58             log("configure_datapath: %s is in use by BOND master %s" % (pif_netdev_name(pif),pif_netdev_name(b)))
  59             return True
  60     for v in pif_get_vlan_masters(pif):
  61         if pif_currently_in_use(v):
  62             log("configure_datapath: %s is in use by VLAN master %s" % (pif_netdev_name(pif),pif_netdev_name(v)))
  63             return True
  64     return False
  65
  66 #
  67 # Datapath Configuration
  68 #
  69
  70 def pif_datapath(pif):
  71     """Return the datapath PIF associated with PIF.
  72 A non-VLAN PIF is its own datapath PIF, except that a bridgeless PIF has
  73 no datapath PIF at all.
  74 A VLAN PIF's datapath PIF is its VLAN slave's datapath PIF.
  75 """
  76     if pif_is_vlan(pif):
  77         return pif_datapath(pif_get_vlan_slave(pif))
  78
  79     pifrec = db().get_pif_record(pif)
  80     nwrec = db().get_network_record(pifrec['network'])
  81     if not nwrec['bridge']:
  82         return None
  83     else:
  84         return pif
  85
  86 def datapath_get_physical_pifs(pif):
  87     """Return the PIFs for the physical network device(s) associated with a datapath PIF.
  88 For a bond master PIF, these are the bond slave PIFs.
  89 For a non-VLAN, non-bond master PIF, the PIF is its own physical device PIF.
  90
  91 A VLAN PIF cannot be a datapath PIF.
  92 """
  93     if pif_is_vlan(pif):
  94         # Seems like overkill...
  95         raise Error("get-physical-pifs should not get passed a VLAN")
  96     elif pif_is_bond(pif):
  97         return pif_get_bond_slaves(pif)
  98     else:
  99         return [pif]
 100
 101 def datapath_deconfigure_physical(netdev):
 102     return ['--', '--with-iface', '--if-exists', 'del-port', netdev]
 103
 104 def vsctl_escape(s):
 105     if s.isalnum():
 106         return s
 107
 108     def escape(match):
 109         c = match.group(0)
 110         if c == '\0':
 111             raise Error("strings may not contain null bytes")
 112         elif c == '\\':
 113             return r'\\'
 114         elif c == '\n':
 115             return r'\n'
 116         elif c == '\r':
 117             return r'\r'
 118         elif c == '\t':
 119             return r'\t'
 120         elif c == '\b':
 121             return r'\b'
 122         elif c == '\a':
 123             return r'\a'
 124         else:
 125             return r'\x%02x' % ord(c)
 126     return '"' + re.sub(r'["\\\000-\037]', escape, s) + '"'
 127
 128 def datapath_configure_bond(pif,slaves):
 129     bridge = pif_bridge_name(pif)
 130     pifrec = db().get_pif_record(pif)
 131     interface = pif_netdev_name(pif)
 132
 133     argv = ['--', '--fake-iface', 'add-bond', bridge, interface]
 134     for slave in slaves:
 135         argv += [pif_netdev_name(slave)]
 136
 137     # Bonding options.
 138     bond_options = {
 139         "mode":   "balance-slb",
 140         "miimon": "100",
 141         "downdelay": "200",
 142         "updelay": "31000",
 143         "use_carrier": "1",
 144         }
 145     # override defaults with values from other-config whose keys
 146     # being with "bond-"
 147     oc = pifrec['other_config']
 148     overrides = filter(lambda (key,val):
 149                            key.startswith("bond-"), oc.items())
 150     overrides = map(lambda (key,val): (key[5:], val), overrides)
 151     bond_options.update(overrides)
 152
 153     argv += ['--', 'set', 'Port', interface]
 154     if pifrec['MAC'] != "":
 155         argv += ['MAC=%s' % vsctl_escape(pifrec['MAC'])]
 156     for (name,val) in bond_options.items():
 157         if name in ['updelay', 'downdelay']:
 158             # updelay and downdelay have dedicated schema columns.
 159             # The value must be a nonnegative integer.
 160             try:
 161                 value = int(val)
 162                 if value < 0:
 163                     raise ValueError
 164
 165                 argv += ['bond_%s=%d' % (name, value)]
 166             except ValueError:
 167                 log("bridge %s has invalid %s '%s'" % (bridge, name, value))
 168         else:
 169             # Pass other bond options into other_config.
 170             argv += ["other-config:%s=%s" % (vsctl_escape("bond-%s" % name),
 171                                              vsctl_escape(val))]
 172     return argv
 173
 174 def datapath_deconfigure_bond(netdev):
 175     return ['--', '--with-iface', '--if-exists', 'del-port', netdev]
 176
 177 def datapath_deconfigure_ipdev(interface):
 178     return ['--', '--with-iface', '--if-exists', 'del-port', interface]
 179
 180 def datapath_modify_config(commands):
 181     #log("modifying configuration:")
 182     #for c in commands:
 183     #    log("  %s" % c)
 184
 185     rc = run_command(['/usr/bin/ovs-vsctl'] + ['--timeout=20']
 186                      + [c for c in commands if not c.startswith('#')])
 187     if not rc:
 188         raise Error("Failed to modify vswitch configuration")
 189     return True
 190
 191 #
 192 # Toplevel Datapath Configuration.
 193 #
 194
 195 def configure_datapath(pif):
 196     """Bring up the configuration for 'pif', which must not be a VLAN PIF, by:
 197     - Tearing down other PIFs that use the same physical devices as 'pif'.
 198     - Ensuring that 'pif' itself is set up.
 199     - *Not* tearing down any PIFs that are stacked on top of 'pif' (i.e. VLANs
 200       on top of 'pif'.
 201
 202     Returns a tuple containing
 203     - A list containing the necessary vsctl command line arguments
 204     - A list of additional devices which should be brought up after
 205       the configuration is applied.
 206     """
 207
 208     vsctl_argv = []
 209     extra_up_ports = []
 210
 211     assert not pif_is_vlan(pif)
 212     bridge = pif_bridge_name(pif)
 213
 214     physical_devices = datapath_get_physical_pifs(pif)
 215
 216     vsctl_argv += ['## configuring datapath %s' % bridge]
 217
 218     # Determine additional devices to deconfigure.
 219     #
 220     # Given all physical devices which are part of this PIF we need to
 221     # consider:
 222     # - any additional bond which a physical device is part of.
 223     # - any additional physical devices which are part of an additional bond.
 224     #
 225     # Any of these which are not currently in use should be brought
 226     # down and deconfigured.
 227     extra_down_bonds = []
 228     extra_down_ports = []
 229     for p in physical_devices:
 230         for bond in pif_get_bond_masters(p):
 231             if bond == pif:
 232                 log("configure_datapath: leaving bond %s up" % pif_netdev_name(bond))
 233                 continue
 234             if bond in extra_down_bonds:
 235                 continue
 236             if db().get_pif_record(bond)['currently_attached']:
 237                 log("configure_datapath: implicitly tearing down currently-attached bond %s" % pif_netdev_name(bond))
 238
 239             extra_down_bonds += [bond]
 240
 241             for s in pif_get_bond_slaves(bond):
 242                 if s in physical_devices:
 243                     continue
 244                 if s in extra_down_ports:
 245                     continue
 246                 if pif_currently_in_use(s):
 247                     continue
 248                 extra_down_ports += [s]
 249
 250     log("configure_datapath: bridge      - %s" % bridge)
 251     log("configure_datapath: physical    - %s" % [pif_netdev_name(p) for p in physical_devices])
 252     log("configure_datapath: extra ports - %s" % [pif_netdev_name(p) for p in extra_down_ports])
 253     log("configure_datapath: extra bonds - %s" % [pif_netdev_name(p) for p in extra_down_bonds])
 254
 255     # Need to fully deconfigure any bridge which any of the:
 256     # - physical devices
 257     # - bond devices
 258     # - sibling devices
 259     # refers to
 260     for brpif in physical_devices + extra_down_ports + extra_down_bonds:
 261         if brpif == pif:
 262             continue
 263         b = pif_bridge_name(brpif)
 264         #ifdown(b)
 265         # XXX
 266         netdev_down(b)
 267         vsctl_argv += ['# remove bridge %s' % b]
 268         vsctl_argv += ['--', '--if-exists', 'del-br', b]
 269
 270     for n in extra_down_ports:
 271         dev = pif_netdev_name(n)
 272         vsctl_argv += ['# deconfigure sibling physical device %s' % dev]
 273         vsctl_argv += datapath_deconfigure_physical(dev)
 274         netdev_down(dev)
 275
 276     for n in extra_down_bonds:
 277         dev = pif_netdev_name(n)
 278         vsctl_argv += ['# deconfigure bond device %s' % dev]
 279         vsctl_argv += datapath_deconfigure_bond(dev)
 280         netdev_down(dev)
 281
 282     for p in physical_devices:
 283         dev = pif_netdev_name(p)
 284         vsctl_argv += ['# deconfigure physical port %s' % dev]
 285         vsctl_argv += datapath_deconfigure_physical(dev)
 286
 287     vsctl_argv += ['--', '--may-exist', 'add-br', bridge]
 288
 289     if len(physical_devices) > 1:
 290         vsctl_argv += ['# deconfigure bond %s' % pif_netdev_name(pif)]
 291         vsctl_argv += datapath_deconfigure_bond(pif_netdev_name(pif))
 292         vsctl_argv += ['# configure bond %s' % pif_netdev_name(pif)]
 293         vsctl_argv += datapath_configure_bond(pif, physical_devices)
 294         extra_up_ports += [pif_netdev_name(pif)]
 295     else:
 296         iface = pif_netdev_name(physical_devices[0])
 297         vsctl_argv += ['# add physical device %s' % iface]
 298         vsctl_argv += ['--', '--may-exist', 'add-port', bridge, iface]
 299
 300     vsctl_argv += set_br_external_ids(pif)
 301     vsctl_argv += ['## done configuring datapath %s' % bridge]
 302
 303     return vsctl_argv,extra_up_ports
 304
 305 def deconfigure_bridge(pif):
 306     vsctl_argv = []
 307
 308     bridge = pif_bridge_name(pif)
 309
 310     log("deconfigure_bridge: bridge           - %s" % bridge)
 311
 312     vsctl_argv += ['# deconfigure bridge %s' % bridge]
 313     vsctl_argv += ['--', '--if-exists', 'del-br', bridge]
 314
 315     return vsctl_argv
 316
 317 def set_br_external_ids(pif):
 318     pifrec = db().get_pif_record(pif)
 319     dp = pif_datapath(pif)
 320     dprec = db().get_pif_record(dp)
 321
 322     xs_network_uuids = []
 323     for nwpif in db().get_pifs_by_device(pifrec['device']):
 324         rec = db().get_pif_record(nwpif)
 325
 326         # When state is read from dbcache PIF.currently_attached
 327         # is always assumed to be false... Err on the side of
 328         # listing even detached networks for the time being.
 329         #if nwpif != pif and not rec['currently_attached']:
 330         #    log("Network PIF %s not currently attached (%s)" % (rec['uuid'],pifrec['uuid']))
 331         #    continue
 332         nwrec = db().get_network_record(rec['network'])
 333         xs_network_uuids += [nwrec['uuid']]
 334
 335     vsctl_argv = []
 336     vsctl_argv += ['# configure network-uuids']
 337     vsctl_argv += ['--', 'br-set-external-id', pif_bridge_name(pif),
 338             'network-uuids', ';'.join(xs_network_uuids)]
 339
 340     vsctl_argv += ['# configure MAC']
 341     vsctl_argv += ['--', 'set', 'Interface', pif_ipdev_name(pif),
 342                    'MAC=%s' % vsctl_escape(dprec['MAC'])]
 343
 344     return vsctl_argv
 345
 346 #
 347 #
 348 #
 349
 350 class DatapathVswitch(Datapath):
 351     def __init__(self, pif):
 352         Datapath.__init__(self, pif)
 353         self._dp = pif_datapath(pif)
 354         self._ipdev = pif_ipdev_name(pif)
 355
 356         if pif_is_vlan(pif) and not self._dp:
 357             raise Error("Unbridged VLAN devices not implemented yet")
 358
 359         log("Configured for Vswitch datapath")
 360
 361     def configure_ipdev(self, cfg):
 362         cfg.write("TYPE=Ethernet\n")
 363
 364     def preconfigure(self, parent):
 365         vsctl_argv = []
 366         extra_ports = []
 367
 368         pifrec = db().get_pif_record(self._pif)
 369         dprec = db().get_pif_record(self._dp)
 370
 371         ipdev = self._ipdev
 372         c,e = configure_datapath(self._dp)
 373         bridge = pif_bridge_name(self._pif)
 374         vsctl_argv += c
 375         extra_ports += e
 376
 377         if pif_is_vlan(self._pif):
 378             # XXX this is only needed on XS5.5, because XAPI misguidedly
 379             # creates the fake bridge (via bridge ioctl) before it calls us.
 380             vsctl_argv += ['--', '--if-exists', 'del-br', bridge]
 381
 382             # configure_datapath() set up the underlying datapath bridge.
 383             # Stack a VLAN bridge on top of it.
 384             vsctl_argv += ['--', '--may-exist', 'add-br',
 385                            bridge, pif_bridge_name(self._dp), pifrec['VLAN']]
 386
 387             vsctl_argv += set_br_external_ids(self._pif)
 388
 389         if ipdev != bridge:
 390             vsctl_argv += ["# deconfigure ipdev %s" % ipdev]
 391             vsctl_argv += datapath_deconfigure_ipdev(ipdev)
 392             vsctl_argv += ["# reconfigure ipdev %s" % ipdev]
 393             vsctl_argv += ['--', 'add-port', bridge, ipdev]
 394
 395         self._vsctl_argv = vsctl_argv
 396         self._extra_ports = extra_ports
 397
 398     def bring_down_existing(self):
 399         pass
 400
 401     def configure(self):
 402         # Bring up physical devices. ovs-vswitchd initially enables or
 403         # disables bond slaves based on whether carrier is detected
 404         # when they are added, and a network device that is down
 405         # always reports "no carrier".
 406         physical_devices = datapath_get_physical_pifs(self._dp)
 407
 408         for p in physical_devices:
 409             prec = db().get_pif_record(p)
 410             oc = prec['other_config']
 411
 412             dev = pif_netdev_name(p)
 413
 414             mtu = mtu_setting(prec['network'], "PIF", oc)
 415
 416             netdev_up(dev, mtu)
 417
 418             settings, offload = ethtool_settings(oc)
 419             if len(settings):
 420                 run_command(['/sbin/ethtool', '-s', dev] + settings)
 421             if len(offload):
 422                 run_command(['/sbin/ethtool', '-K', dev] + offload)
 423
 424         datapath_modify_config(self._vsctl_argv)
 425
 426     def post(self):
 427         for p in self._extra_ports:
 428             log("action_up: bring up %s" % p)
 429             netdev_up(p)
 430
 431     def bring_down(self):
 432         vsctl_argv = []
 433
 434         dp = self._dp
 435         ipdev = self._ipdev
 436
 437         bridge = pif_bridge_name(dp)
 438
 439         #nw = db().get_pif_record(self._pif)['network']
 440         #nwrec = db().get_network_record(nw)
 441         #vsctl_argv += ['# deconfigure network-uuids']
 442         #vsctl_argv += ['--del-entry=bridge.%s.network-uuids=%s' % (bridge,nwrec['uuid'])]
 443
 444         log("deconfigure ipdev %s on %s" % (ipdev,bridge))
 445         vsctl_argv += ["# deconfigure ipdev %s" % ipdev]
 446         vsctl_argv += datapath_deconfigure_ipdev(ipdev)
 447
 448         if pif_is_vlan(self._pif):
 449             # Delete the VLAN bridge.
 450             vsctl_argv += deconfigure_bridge(self._pif)
 451
 452             # If the VLAN's slave is attached, leave datapath setup.
 453             slave = pif_get_vlan_slave(self._pif)
 454             if db().get_pif_record(slave)['currently_attached']:
 455                 log("action_down: vlan slave is currently attached")
 456                 dp = None
 457
 458             # If the VLAN's slave has other VLANs that are attached, leave datapath setup.
 459             for master in pif_get_vlan_masters(slave):
 460                 if master != self._pif and db().get_pif_record(master)['currently_attached']:
 461                     log("action_down: vlan slave has other master: %s" % pif_netdev_name(master))
 462                     dp = None
 463
 464             # Otherwise, take down the datapath too (fall through)
 465             if dp:
 466                 log("action_down: no more masters, bring down slave %s" % bridge)
 467         else:
 468             # Stop here if this PIF has attached VLAN masters.
 469             masters = [db().get_pif_record(m)['VLAN'] for m in pif_get_vlan_masters(self._pif) if db().get_pif_record(m)['currently_attached']]
 470             if len(masters) > 0:
 471                 log("Leaving datapath %s up due to currently attached VLAN masters %s" % (bridge, masters))
 472                 dp = None
 473
 474         if dp:
 475             vsctl_argv += deconfigure_bridge(dp)
 476
 477             physical_devices = [pif_netdev_name(p) for p in datapath_get_physical_pifs(dp)]
 478
 479             log("action_down: bring down physical devices - %s" % physical_devices)
 480
 481             for p in physical_devices:
 482                 netdev_down(p)
 483
 484         datapath_modify_config(vsctl_argv)