utilities/ovs-ctl.in

   1 #! /bin/sh
   2 # Copyright (C) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
   3 #
   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:
   7 #
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9 #
  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.
  15
  16 case $0 in
  17     */*) dir0=`echo "$0" | sed 's,/[^/]*$,,'` ;;
  18     *) dir0=./ ;;
  19 esac
  20 . "$dir0/ovs-lib" || exit 1
  21
  22 for dir in "$sbindir" "$bindir" /sbin /bin /usr/sbin /usr/bin; do
  23     case :$PATH: in
  24         *:$dir:*) ;;
  25         *) PATH=$PATH:$dir ;;
  26     esac
  27 done
  28
  29 ## ----- ##
  30 ## start ##
  31 ## ----- ##
  32
  33 insert_openvswitch_mod_if_required () {
  34     # If openvswitch is already loaded then we're done.
  35     test -e /sys/module/openvswitch -o -e /sys/module/openvswitch_mod && \
  36      return 0
  37
  38     # Load openvswitch.  If that's successful then we're done.
  39     action "Inserting openvswitch module" modprobe openvswitch && return 0
  40
  41     # If the bridge module is loaded, then that might be blocking
  42     # openvswitch.  Try to unload it, if there are no bridges.
  43     test -e /sys/module/bridge || return 1
  44     bridges=`echo /sys/class/net/*/bridge | sed 's,/sys/class/net/,,g;s,/bridge,,g'`
  45     if test "$bridges" != "*"; then
  46         log_warning_msg "not removing bridge module because bridges exist ($bridges)"
  47         return 1
  48     fi
  49     action "removing bridge module" rmmod bridge || return 1
  50
  51     # Try loading openvswitch again.
  52     action "Inserting openvswitch module" modprobe openvswitch
  53 }
  54
  55 insert_mod_if_required () {
  56     insert_openvswitch_mod_if_required || return 1
  57 }
  58
  59 ovs_vsctl () {
  60     ovs-vsctl --no-wait --timeout=5 "$@"
  61 }
  62
  63 ovsdb_tool () {
  64     ovsdb-tool -vconsole:off "$@"
  65 }
  66
  67 create_db () {
  68     action "Creating empty database $DB_FILE" ovsdb_tool create "$DB_FILE" "$DB_SCHEMA"
  69 }
  70
  71 upgrade_db () {
  72     schemaver=`ovsdb_tool schema-version "$DB_SCHEMA"`
  73     if test ! -e "$DB_FILE"; then
  74         log_warning_msg "$DB_FILE does not exist"
  75         install -d -m 755 -o root -g root `dirname $DB_FILE`
  76         create_db
  77     elif test X"`ovsdb_tool needs-conversion "$DB_FILE" "$DB_SCHEMA"`" != Xno; then
  78         # Back up the old version.
  79         version=`ovsdb_tool db-version "$DB_FILE"`
  80         cksum=`ovsdb_tool db-cksum "$DB_FILE" | awk '{print $1}'`
  81         backup=$DB_FILE.backup$version-$cksum
  82         action "Backing up database to $backup" cp "$DB_FILE" "$backup" || return 1
  83
  84         # Compact database.  This is important if the old schema did not enable
  85         # garbage collection (i.e. if it did not have any tables with "isRoot":
  86         # true) but the new schema does.  In that situation the old database
  87         # may contain a transaction that creates a record followed by a
  88         # transaction that creates the first use of the record.  Replaying that
  89         # series of transactions against the new database schema (as "convert"
  90         # does) would cause the record to be dropped by the first transaction,
  91         # then the second transaction would cause a referential integrity
  92         # failure (for a strong reference).
  93         #
  94         # Errors might occur on an Open vSwitch downgrade if ovsdb-tool doesn't
  95         # understand some feature of the schema used in the OVSDB version that
  96         # we're downgrading from, so we don't give up on error.
  97         action "Compacting database" ovsdb_tool compact "$DB_FILE"
  98
  99         # Upgrade or downgrade schema.
 100         if action "Converting database schema" ovsdb_tool convert "$DB_FILE" "$DB_SCHEMA"; then
 101             :
 102         else
 103             log_warning_msg "Schema conversion failed, using empty database instead"
 104             rm -f "$DB_FILE"
 105             create_db
 106         fi
 107     fi
 108 }
 109
 110 set_system_ids () {
 111     set ovs_vsctl set Open_vSwitch .
 112
 113     OVS_VERSION=`ovs-vswitchd --version | sed 's/.*) //;1q'`
 114     set "$@" ovs-version="$OVS_VERSION"
 115
 116     case $SYSTEM_ID in
 117         random)
 118             id_file=$etcdir/system-id.conf
 119             uuid_file=$etcdir/install_uuid.conf
 120             if test -e "$id_file"; then
 121                 SYSTEM_ID=`cat "$id_file"`
 122             elif test -e "$uuid_file"; then
 123                 # Migrate from old file name.
 124                 . "$uuid_file"
 125                 SYSTEM_ID=$INSTALLATION_UUID
 126                 echo "$SYSTEM_ID" > "$id_file"
 127             elif SYSTEM_ID=`uuidgen`; then
 128                 echo "$SYSTEM_ID" > "$id_file"
 129             else
 130                 log_failure_msg "missing uuidgen, could not generate system ID"
 131             fi
 132             ;;
 133
 134         '')
 135             log_failure_msg "system ID not configured, please use --system-id"
 136             ;;
 137
 138         *)
 139             ;;
 140     esac
 141     set "$@" external-ids:system-id="\"$SYSTEM_ID\""
 142
 143     if test X"$SYSTEM_TYPE" != X; then
 144         set "$@" system-type="\"$SYSTEM_TYPE\""
 145     else
 146         log_failure_msg "no default system type, please use --system-type"
 147     fi
 148
 149     if test X"$SYSTEM_VERSION" != X; then
 150         set "$@" system-version="\"$SYSTEM_VERSION\""
 151     else
 152         log_failure_msg "no default system version, please use --system-version"
 153     fi
 154
 155     action "Configuring Open vSwitch system IDs" "$@" $extra_ids
 156 }
 157
 158 check_force_cores () {
 159     if test X"$FORCE_COREFILES" = Xyes; then
 160         ulimit -Sc 67108864
 161     fi
 162 }
 163
 164 start_ovsdb () {
 165     check_force_cores
 166
 167     if daemon_is_running ovsdb-server; then
 168         log_success_msg "ovsdb-server is already running"
 169     else
 170         # Create initial database or upgrade database schema.
 171         upgrade_db || return 1
 172
 173         # Start ovsdb-server.
 174         set ovsdb-server "$DB_FILE"
 175         for db in $EXTRA_DBS; do
 176             case $db in
 177                 /*) ;;
 178                 *) db=$dbdir/$db ;;
 179             esac
 180
 181             if test ! -f "$db"; then
 182                 log_warning_msg "$db (from \$EXTRA_DBS) does not exist."
 183             elif ovsdb-tool db-version "$db" >/dev/null; then
 184                 set "$@" "$db"
 185             else
 186                 log_warning_msg "$db (from \$EXTRA_DBS) cannot be read as a database (see error message above)"
 187             fi
 188         done
 189         set "$@" -vconsole:emer -vsyslog:err -vfile:info
 190         set "$@" --remote=punix:"$DB_SOCK"
 191         set "$@" --remote=db:Open_vSwitch,Open_vSwitch,manager_options
 192         set "$@" --private-key=db:Open_vSwitch,SSL,private_key
 193         set "$@" --certificate=db:Open_vSwitch,SSL,certificate
 194         set "$@" --bootstrap-ca-cert=db:Open_vSwitch,SSL,ca_cert
 195         start_daemon "$OVSDB_SERVER_PRIORITY" "$OVSDB_SERVER_WRAPPER" "$@" \
 196             || return 1
 197
 198         # Initialize database settings.
 199         ovs_vsctl -- init -- set Open_vSwitch . db-version="$schemaver" \
 200             || return 1
 201         set_system_ids || return 1
 202         if test X"$DELETE_BRIDGES" = Xyes; then
 203             for bridge in `ovs_vsctl list-br`; do
 204         ovs_vsctl del-br $bridge
 205             done
 206         fi
 207     fi
 208 }
 209
 210 start_forwarding () {
 211     check_force_cores
 212
 213     insert_mod_if_required || return 1
 214
 215     if daemon_is_running ovs-vswitchd; then
 216         log_success_msg "ovs-vswitchd is already running"
 217     else
 218         # Increase the limit on the number of open file descriptors.
 219         # On Linux, ovs-vswitchd needs about one file descriptor per
 220         # switch port, so this allows a very large number of switch
 221         # ports.
 222         ulimit -n 5000
 223
 224             # Start ovs-vswitchd.
 225             set ovs-vswitchd unix:"$DB_SOCK"
 226             set "$@" -vconsole:emer -vsyslog:err -vfile:info
 227             if test X"$MLOCKALL" != Xno; then
 228                 set "$@" --mlockall
 229             fi
 230             start_daemon "$OVS_VSWITCHD_PRIORITY" "$OVS_VSWITCHD_WRAPPER" "$@"
 231     fi
 232 }
 233
 234 ## ---- ##
 235 ## stop ##
 236 ## ---- ##
 237
 238 stop_ovsdb () {
 239     stop_daemon ovsdb-server
 240 }
 241
 242 stop_forwarding () {
 243     stop_daemon ovs-vswitchd
 244 }
 245
 246 ## ----------------- ##
 247 ## force-reload-kmod ##
 248 ## ----------------- ##
 249
 250 internal_interfaces () {
 251     # Outputs a list of internal interfaces:
 252     #
 253     #   - There is an internal interface for every bridge, whether it
 254     #     has an Interface record or not and whether the Interface
 255     #     record's 'type' is properly set or not.
 256     #
 257     #   - There is an internal interface for each Interface record whose
 258     #     'type' is 'internal'.
 259     #
 260     # But ignore interfaces that don't really exist.
 261     for d in `(ovs_vsctl --bare \
 262                 -- --columns=name find Interface type=internal \
 263                     -- list-br) | sort -u`
 264     do
 265         if test -e "/sys/class/net/$d"; then
 266                 printf "%s " "$d"
 267             fi
 268     done
 269 }
 270
 271 ovs_save () {
 272     bridges=`ovs_vsctl -- --real list-br`
 273     if [ -n "${bridges}" ] && \
 274         "$datadir/scripts/ovs-save" "$1" ${bridges} > "$2"; then
 275         chmod +x "$2"
 276         return 0
 277     fi
 278     eval $3=""
 279     [ -z "${bridges}" ] && return 0
 280 }
 281
 282 save_ofports_if_required () {
 283     # Save ofports if we are upgrading from a pre-1.10 branch.
 284     case `ovs-appctl version | sed 1q` in
 285         "ovs-vswitchd (Open vSwitch) 1."[0-9].*)
 286             action "Saving ofport values" ovs_save save-ofports \
 287                 "${script_ofports}" script_ofports
 288             ;;
 289         *)
 290             script_ofports=""
 291             ;;
 292     esac
 293 }
 294
 295 save_interfaces () {
 296     "$datadir/scripts/ovs-save" save-interfaces ${ifaces} \
 297         > "${script_interfaces}"
 298 }
 299
 300 restore_ofports () {
 301     [ -n "${script_ofports}" ] && \
 302         action "Restoring ofport values" "${script_ofports}"
 303 }
 304
 305 restore_flows () {
 306     [ -n "${script_flows}" ] && \
 307         action "Restoring saved flows" "${script_flows}"
 308 }
 309
 310 force_reload_kmod () {
 311     ifaces=`internal_interfaces`
 312     action "Detected internal interfaces: $ifaces" true
 313
 314     script_interfaces=`mktemp`
 315     script_flows=`mktemp`
 316     script_ofports=`mktemp`
 317     trap 'rm -f "${script_interfaces}" "${script_flows}" "${script_ofports}"' 0
 318
 319     action "Saving flows" ovs_save save-flows "${script_flows}" script_flows
 320
 321     save_ofports_if_required
 322
 323     # Restart the database first, since a large database may take a
 324     # while to load, and we want to minimize forwarding disruption.
 325     stop_ovsdb
 326     start_ovsdb
 327
 328     # Restore of ofports should happen before vswitchd is restarted.
 329     restore_ofports
 330
 331     stop_forwarding
 332
 333     if action "Saving interface configuration" save_interfaces; then
 334         :
 335     else
 336         log_warning_msg "Failed to save configuration, not replacing kernel module"
 337         start_forwarding
 338         exit 1
 339     fi
 340     chmod +x "$script_interfaces"
 341
 342     for dp in `ovs-dpctl dump-dps`; do
 343         action "Removing datapath: $dp" ovs-dpctl del-dp "$dp"
 344     done
 345
 346     # try both old and new names in case this is post upgrade
 347     if test -e /sys/module/openvswitch_mod; then
 348         action "Removing openvswitch module" rmmod openvswitch_mod
 349     elif test -e /sys/module/openvswitch; then
 350         action "Removing openvswitch module" rmmod openvswitch
 351     fi
 352
 353     start_forwarding
 354
 355     restore_flows
 356
 357     action "Restoring interface configuration" "$script_interfaces"
 358     rc=$?
 359     if test $rc = 0; then
 360         level=debug
 361     else
 362         level=err
 363     fi
 364     log="logger -p daemon.$level -t ovs-save"
 365     $log "force-reload-kmod interface restore script exited with status $rc:"
 366     $log -f "$script_interfaces"
 367
 368     "$datadir/scripts/ovs-check-dead-ifs"
 369 }
 370
 371 ## ------- ##
 372 ## restart ##
 373 ## ------- ##
 374
 375 restart () {
 376     if daemon_is_running ovsdb-server && daemon_is_running ovs-vswitchd; then
 377         script_flows=`mktemp`
 378         trap 'rm -f "${script_flows}"' 0
 379
 380         action "Saving flows" ovs_save save-flows "${script_flows}" \
 381             script_flows
 382     fi
 383
 384     # Restart the database first, since a large database may take a
 385     # while to load, and we want to minimize forwarding disruption.
 386     stop_ovsdb
 387     start_ovsdb
 388
 389     stop_forwarding
 390     start_forwarding
 391
 392     # Restore the saved flows. Do not return error if restore fails.
 393     restore_flows || true
 394 }
 395
 396 ## --------------- ##
 397 ## enable-protocol ##
 398 ## --------------- ##
 399
 400 enable_protocol () {
 401     # Translate the protocol name to a number, because "iptables -n -L" prints
 402     # some protocols by name (despite the -n) and therefore we need to look for
 403     # both forms.
 404     #
 405     # (iptables -S output is more uniform but old iptables doesn't have it.)
 406     protonum=`grep "^$PROTOCOL[         ]" /etc/protocols | awk '{print $2}'`
 407     if expr X"$protonum" : X'[0-9]\{1,\}$' > /dev/null; then :; else
 408         log_failure_msg "unknown protocol $PROTOCOL"
 409         return 1
 410     fi
 411
 412     name=$PROTOCOL
 413     match="(\$2 == \"$PROTOCOL\" || \$2 == $protonum)"
 414     insert="iptables -I INPUT -p $PROTOCOL"
 415     if test X"$DPORT" != X; then
 416         name="$name to port $DPORT"
 417         match="$match && /dpt:$DPORT/"
 418         insert="$insert --dport $DPORT"
 419     fi
 420     if test X"$SPORT" != X; then
 421         name="$name from port $SPORT"
 422         match="$match && /spt:$SPORT/"
 423         insert="$insert --sport $SPORT"
 424     fi
 425     insert="$insert -j ACCEPT"
 426
 427     if (iptables -n -L INPUT) >/dev/null 2>&1; then
 428         if iptables -n -L INPUT | awk "$match { n++ } END { exit n == 0 }"
 429         then
 430             # There's already a rule for this protocol.  Don't override it.
 431             log_success_msg "iptables already has a rule for $name, not explicitly enabling"
 432         else
 433             action "Enabling $name with iptables" $insert
 434         fi
 435     elif (iptables --version) >/dev/null 2>&1; then
 436         action "cannot list iptables rules, not adding a rule for $name"
 437     else
 438         action "iptables binary not installed, not adding a rule for $name"
 439     fi
 440 }
 441
 442 ## ---- ##
 443 ## main ##
 444 ## ---- ##
 445
 446 set_defaults () {
 447     SYSTEM_ID=
 448
 449     DELETE_BRIDGES=no
 450
 451     DAEMON_CWD=/
 452     FORCE_COREFILES=yes
 453     MLOCKALL=yes
 454     OVSDB_SERVER_PRIORITY=-10
 455     OVS_VSWITCHD_PRIORITY=-10
 456     OVSDB_SERVER_WRAPPER=
 457     OVS_VSWITCHD_WRAPPER=
 458
 459     DB_FILE=$dbdir/conf.db
 460     DB_SOCK=$rundir/db.sock
 461     DB_SCHEMA=$datadir/vswitch.ovsschema
 462     EXTRA_DBS=
 463
 464     PROTOCOL=gre
 465     DPORT=
 466     SPORT=
 467
 468     type_file=$etcdir/system-type.conf
 469     version_file=$etcdir/system-version.conf
 470
 471     if test -e "$type_file" ; then
 472         SYSTEM_TYPE=`cat $type_file`
 473         SYSTEM_VERSION=`cat $version_file`
 474     elif (lsb_release --id) >/dev/null 2>&1; then
 475         SYSTEM_TYPE=`lsb_release --id -s`
 476         system_release=`lsb_release --release -s`
 477         system_codename=`lsb_release --codename -s`
 478         SYSTEM_VERSION="${system_release}-${system_codename}"
 479     else
 480         SYSTEM_TYPE=unknown
 481         SYSTEM_VERSION=unknown
 482     fi
 483 }
 484
 485 usage () {
 486     set_defaults
 487     cat <<EOF
 488 $0: controls Open vSwitch daemons
 489 usage: $0 [OPTIONS] COMMAND
 490
 491 This program is intended to be invoked internally by Open vSwitch startup
 492 scripts.  System administrators should not normally invoke it directly.
 493
 494 Commands:
 495   start              start Open vSwitch daemons
 496   stop               stop Open vSwitch daemons
 497   restart            stop and start Open vSwitch daemons
 498   status             check whether Open vSwitch daemons are running
 499   version            print versions of Open vSwitch daemons
 500   load-kmod          insert modules if not already present
 501   force-reload-kmod  save OVS network device state, stop OVS, unload kernel
 502                      module, reload kernel module, start OVS, restore state
 503   enable-protocol    enable protocol specified in options with iptables
 504   help               display this help message
 505
 506 One of the following options is required for "start", "restart" and "force-reload-kmod":
 507   --system-id=UUID   set specific ID to uniquely identify this system
 508   --system-id=random  use a random but persistent UUID to identify this system
 509
 510 Other important options for "start", "restart" and "force-reload-kmod":
 511   --system-type=TYPE  set system type (e.g. "XenServer")
 512   --system-version=VERSION  set system version (e.g. "5.6.100-39265p")
 513   --external-id="key=value"
 514                      add given key-value pair to Open_vSwitch external-ids
 515   --delete-bridges   delete all bridges just before starting ovs-vswitchd
 516
 517 Less important options for "start", "restart" and "force-reload-kmod":
 518   --daemon-cwd=DIR               set working dir for OVS daemons (default: $DAEMON_CWD)
 519   --no-force-corefiles           do not force on core dumps for OVS daemons
 520   --no-mlockall                  do not lock all of ovs-vswitchd into memory
 521   --ovsdb-server-priority=NICE   set ovsdb-server's niceness (default: $OVSDB_SERVER_PRIORITY)
 522   --ovs-vswitchd-priority=NICE   set ovs-vswitchd's niceness (default: $OVS_VSWITCHD_PRIORITY)
 523
 524 Debugging options for "start", "restart" and "force-reload-kmod":
 525   --ovsdb-server-wrapper=WRAPPER
 526   --ovs-vswitchd-wrapper=WRAPPER
 527   --ovs-vswitchd-wrapper=WRAPPER
 528      run specified daemon under WRAPPER (either 'valgrind' or 'strace')
 529
 530 File location options:
 531   --db-file=FILE     database file name (default: $DB_FILE)
 532   --db-sock=SOCKET   JSON-RPC socket name (default: $DB_SOCK)
 533   --db-schema=FILE   database schema file name (default: $DB_SCHEMA)
 534
 535 Options for "enable-protocol":
 536   --protocol=PROTOCOL  protocol to enable with iptables (default: gre)
 537   --sport=PORT       source port to match (for tcp or udp protocol)
 538   --dport=PORT       ddestination port to match (for tcp or udp protocol)
 539
 540 Other options:
 541   -h, --help                  display this help message
 542   -V, --version               display version information
 543
 544 Default directories with "configure" option and environment variable override:
 545   logs: @LOGDIR@ (--with-logdir, OVS_LOGDIR)
 546   pidfiles and sockets: @RUNDIR@ (--with-rundir, OVS_RUNDIR)
 547   conf.db: @DBDIR@ (--with-dbdir, OVS_DBDIR)
 548   system configuration: @sysconfdir@ (--sysconfdir, OVS_SYSCONFDIR)
 549   data files: @pkgdatadir@ (--pkgdatadir, OVS_PKGDATADIR)
 550   user binaries: @bindir@ (--bindir, OVS_BINDIR)
 551   system binaries: @sbindir@ (--sbindir, OVS_SBINDIR)
 552
 553 Please report bugs to bugs@openvswitch.org (see REPORTING-BUGS for details).
 554 EOF
 555
 556     exit 0
 557 }
 558
 559 set_option () {
 560     var=`echo "$option" | tr abcdefghijklmnopqrstuvwxyz- ABCDEFGHIJKLMNOPQRSTUVWXYZ_`
 561     eval set=\${$var+yes}
 562     eval old_value=\$$var
 563     if test X$set = X || \
 564         (test $type = bool && \
 565         test X"$old_value" != Xno && test X"$old_value" != Xyes); then
 566         echo >&2 "$0: unknown option \"$arg\" (use --help for help)"
 567         return
 568     fi
 569     eval $var=\$value
 570 }
 571
 572 daemons () {
 573     echo ovsdb-server ovs-vswitchd
 574 }
 575
 576 set_defaults
 577 extra_ids=
 578 command=
 579 for arg
 580 do
 581     case $arg in
 582         -h | --help)
 583             usage
 584             ;;
 585         -V | --version)
 586             echo "$0 (Open vSwitch) $VERSION"
 587             exit 0
 588             ;;
 589         --external-id=*)
 590             value=`expr X"$arg" : 'X[^=]*=\(.*\)'`
 591             case $value in
 592                 *=*)
 593                     extra_ids="$extra_ids external-ids:$value"
 594                     ;;
 595                 *)
 596                     echo >&2 "$0: --external-id argument not in the form \"key=value\""
 597                     exit 1
 598                     ;;
 599             esac
 600             ;;
 601         --[a-z]*=*)
 602             option=`expr X"$arg" : 'X--\([^=]*\)'`
 603             value=`expr X"$arg" : 'X[^=]*=\(.*\)'`
 604             type=string
 605             set_option
 606             ;;
 607         --no-[a-z]*)
 608             option=`expr X"$arg" : 'X--no-\(.*\)'`
 609             value=no
 610             type=bool
 611             set_option
 612             ;;
 613         --[a-z]*)
 614             option=`expr X"$arg" : 'X--\(.*\)'`
 615             value=yes
 616             type=bool
 617             set_option
 618             ;;
 619         -*)
 620             echo >&2 "$0: unknown option \"$arg\" (use --help for help)"
 621             exit 1
 622             ;;
 623         *)
 624             if test X"$command" = X; then
 625                 command=$arg
 626             else
 627                 echo >&2 "$0: exactly one non-option argument required (use --help for help)"
 628                 exit 1
 629             fi
 630             ;;
 631     esac
 632 done
 633 case $command in
 634     start)
 635         start_ovsdb
 636         start_forwarding
 637         ;;
 638     stop)
 639         stop_forwarding
 640         stop_ovsdb
 641         ;;
 642     restart)
 643         restart
 644         ;;
 645     status)
 646         rc=0
 647         for daemon in `daemons`; do
 648             daemon_status $daemon || rc=$?
 649         done
 650         exit $rc
 651         ;;
 652     version)
 653         for daemon in `daemons`; do
 654             $daemon --version
 655         done
 656         ;;
 657     force-reload-kmod)
 658             force_reload_kmod
 659         ;;
 660     load-kmod)
 661         insert_mod_if_required
 662         ;;
 663     enable-protocol)
 664         enable_protocol
 665         ;;
 666     help)
 667         usage
 668         ;;
 669     '')
 670         echo >&2 "$0: missing command name (use --help for help)"
 671         exit 1
 672         ;;
 673     *)
 674         echo >&2 "$0: unknown command \"$command\" (use --help for help)"
 675         exit 1
 676         ;;
 677 esac