etc/network.subr

   1 #
   2 # Copyright (c) 2003 The FreeBSD Project. All rights reserved.
   3 #
   4 # Redistribution and use in source and binary forms, with or without
   5 # modification, are permitted provided that the following conditions
   6 # are met:
   7 # 1. Redistributions of source code must retain the above copyright
   8 #    notice, this list of conditions and the following disclaimer.
   9 # 2. Redistributions in binary form must reproduce the above copyright
  10 #    notice, this list of conditions and the following disclaimer in the
  11 #    documentation and/or other materials provided with the distribution.
  12 #
  13 # THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  14 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16 # ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  17 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23 # SUCH DAMAGE.
  24 #
  25 # $FreeBSD: src/etc/network.subr,v 1.163 2005/06/30 04:52:47 brooks Exp $
  26 # $DragonFly: src/etc/network.subr,v 1.6 2008/02/04 19:03:06 swildner Exp $
  27 #
  28
  29 #
  30 # Subroutines commonly used from network startup scripts.
  31 # Requires that rc.conf be loaded first.
  32 #
  33
  34 # ifconfig_up if
  35 #       Evaluate ifconfig(8) arguments for interface $if and
  36 #       run ifconfig(8) with those arguments. It returns 0 if
  37 #       arguments were found and executed or 1 if the interface
  38 #       had no arguments.  Pseudo arguments DHCP and WPA are handled
  39 #       here.
  40 #
  41 ifconfig_up()
  42 {
  43         _cfg=1
  44
  45         ifconfig_args=`ifconfig_getargs $1`
  46         if [ -n "${ifconfig_args}" ]; then
  47                 ifconfig $1 ${ifconfig_args}
  48                 _cfg=0
  49         fi
  50
  51         if wpaif $1; then
  52                 /etc/rc.d/wpa_supplicant start $1
  53                 _cfg=0          # XXX: not sure this should count
  54         fi
  55
  56         if dhcpif $1; then
  57                 /etc/rc.d/dhclient start $1
  58                 _cfg=0
  59         fi
  60
  61         return $_cfg
  62 }
  63
  64 # ifconfig_down if
  65 #       Remove all inet entries from the $if interface. It returns
  66 #       0 if inet entries were found and removed. It returns 1 if
  67 #       no entries were found or they could not be removed.
  68 #
  69 ifconfig_down()
  70 {
  71         [ -z "$1" ] && return 1
  72         _ifs="^"
  73         _cfg=1
  74
  75         inetList="`ifconfig $1 | grep 'inet ' | tr "\n" "$_ifs"`"
  76
  77         oldifs="$IFS"
  78         IFS="$_ifs"
  79         for _inet in $inetList ; do
  80                 # get rid of extraneous line
  81                 [ -z "$_inet" ] && break
  82
  83                 _inet=`expr "$_inet" : '.*\(inet \([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}\).*'`
  84
  85                 IFS="$oldifs"
  86                 ifconfig $1 ${_inet} delete
  87                 IFS="$_ifs"
  88                 _cfg=0
  89         done
  90         IFS="$oldifs"
  91
  92         if wpaif $1; then
  93                 /etc/rc.d/wpa_supplicant stop $1
  94         fi
  95
  96         if dhcpif $1; then
  97                 /etc/rc.d/dhclient stop $1
  98                 _cfg=0
  99         fi
 100
 101         return $_cfg
 102 }
 103
 104 # _ifconfig_getargs if
 105 #       Echos the arguments for the supplied interface to stdout.
 106 #       returns 1 if empty.  In general, ifconfig_getargs should be used
 107 #       outside this file.
 108 _ifconfig_getargs()
 109 {
 110         _ifn=$1
 111         if [ -z "$_ifn" ]; then
 112                 return 1
 113         fi
 114
 115         eval _args=\$ifconfig_$1
 116         if [ -z "$_args" -a -n "${pccard_ifconfig}" ]; then
 117                 for _if in ${removable_interfaces} ; do
 118                         if [ "$_if" = "$_ifn" ] ; then
 119                                 _args=${pccard_ifconfig}
 120                                 break
 121                         fi
 122                 done
 123         fi
 124
 125         echo $_args
 126 }
 127
 128 # ifconfig_getargs if
 129 #       Takes the result from _ifconfig_getargs and removes pseudo
 130 #       args such as DHCP and WPA.
 131 ifconfig_getargs()
 132 {
 133         _tmpargs=`_ifconfig_getargs $1`
 134         if [ $? -eq 1 ]; then
 135                 return 1
 136         fi
 137         _args=
 138
 139         is_optarg=no
 140         for _arg in $_tmpargs; do
 141                 if [ "$is_optarg" = "no" ]; then
 142                         case $_arg in
 143                         [Dd][Hh][Cc][Pp])
 144                                 ;;
 145                         [Ww][Pp][Aa])
 146                                 ;;
 147                         *)
 148                                 _args="$_args $_arg"
 149                                 case $_arg in
 150                                 authmode)
 151                                         is_optarg=yes
 152                                         ;;
 153                                 esac
 154                                 ;;
 155                         esac
 156                 else
 157                         _args="$_args $_arg"
 158                         is_optarg=no
 159                 fi
 160         done
 161
 162         echo $_args
 163 }
 164
 165 # dhcpif if
 166 #       Returns 0 if the interface is a DHCP interface and 1 otherwise.
 167 dhcpif()
 168 {
 169         _tmpargs=`_ifconfig_getargs $1`
 170         for _arg in $_tmpargs; do
 171                 case $_arg in
 172                 [Dd][Hh][Cc][Pp])
 173                         return 0
 174                         ;;
 175                 esac
 176         done
 177         return 1
 178 }
 179
 180 # wpaif if
 181 #       Returns 0 if the interface is a WPA interface and 1 otherwise.
 182 wpaif()
 183 {
 184         _tmpargs=`_ifconfig_getargs $1`
 185         is_optarg=no
 186         for _arg in $_tmpargs; do
 187                 if [ "$is_optarg" = "no" ]; then
 188                         case $_arg in
 189                         [Ww][Pp][Aa])
 190                                 return 0
 191                                 ;;
 192                         authmode)
 193                                 is_optarg=yes
 194                                 ;;
 195                         esac
 196                 else
 197                         is_optarg=no
 198                 fi
 199         done
 200         return 1
 201 }
 202
 203 # ifalias_up if
 204 #       Configure aliases for network interface $if.
 205 #       It returns 0 if at least one alias was configured or
 206 #       1 if there were none.
 207 #
 208 ifalias_up()
 209 {
 210         _ret=1
 211         alias=0
 212         while : ; do
 213                 eval ifconfig_args=\$ifconfig_$1_alias${alias}
 214                 if [ -n "${ifconfig_args}" ]; then
 215                         ifconfig $1 ${ifconfig_args} alias
 216                         alias=$((${alias} + 1))
 217                         _ret=0
 218                 else
 219                         break
 220                 fi
 221         done
 222         return $_ret
 223 }
 224
 225 #ifalias_down if
 226 #       Remove aliases for network interface $if.
 227 #       It returns 0 if at least one alias was removed or
 228 #       1 if there were none.
 229 #
 230 ifalias_down()
 231 {
 232         _ret=1
 233         alias=0
 234         while : ; do
 235                 eval ifconfig_args=\$ifconfig_$1_alias${alias}
 236                 if [ -n "${ifconfig_args}" ]; then
 237                         ifconfig $1 ${ifconfig_args} -alias
 238                         alias=$((${alias} + 1))
 239                         _ret=0
 240                 else
 241                         break
 242                 fi
 243         done
 244         return $_ret
 245 }
 246
 247 # ifscript_up if
 248 #       Evaluate a startup script for the $if interface.
 249 #       It returns 0 if a script was found and processed or
 250 #       1 if no script was found.
 251 #
 252 ifscript_up()
 253 {
 254         if [ -r /etc/start_if.$1 ]; then
 255                 . /etc/start_if.$1
 256                 return 0
 257         fi
 258         return 1
 259 }
 260
 261 # ifscript_down if
 262 #       Evaluate a shutdown script for the $if interface.
 263 #       It returns 0 if a script was found and processed or
 264 #       1 if no script was found.
 265 #
 266 ifscript_down()
 267 {
 268         if [ -r /etc/stop_if.$1 ]; then
 269                 . /etc/stop_if.$1
 270                 return 0
 271         fi
 272         return 1
 273 }
 274
 275 # Create cloneable interfaces.
 276 #
 277 clone_up()
 278 {
 279         _prefix=
 280         _list=
 281         for ifn in ${cloned_interfaces}; do
 282                 ifconfig ${ifn} create
 283                 if [ $? -eq 0 ]; then
 284                         _list="${_list}${_prefix}${ifn}"
 285                         [ -z "$_prefix" ] && _prefix=' '
 286                 fi
 287         done
 288         debug "Cloned: ${_list}"
 289 }
 290
 291 # Destroy cloned interfaces. Destroyed interfaces are echoed
 292 # to standard output.
 293 #
 294 clone_down()
 295 {
 296         _prefix=
 297         _list=
 298         for ifn in ${cloned_interfaces}; do
 299                 ifconfig ${ifn} destroy
 300                 if [ $? -eq 0 ]; then
 301                         _list="${_list}${_prefix}${ifn}"
 302                         [ -z "$_prefix" ] && _prefix=' '
 303                 fi
 304         done
 305         debug "Destroyed clones: ${_list}"
 306 }
 307
 308 gif_up() {
 309         case ${gif_interfaces} in
 310         [Nn][Oo] | '')
 311                 ;;
 312         *)
 313                 for i in ${gif_interfaces}; do
 314                         eval peers=\$gifconfig_$i
 315                         case ${peers} in
 316                         '')
 317                                 continue
 318                                 ;;
 319                         *)
 320                                 ifconfig $i create >/dev/null 2>&1
 321                                 ifconfig $i tunnel ${peers}
 322                                 ifconfig $i up
 323                                 ;;
 324                         esac
 325                 done
 326                 ;;
 327         esac
 328 }
 329
 330 #
 331 # ipx_up ifn
 332 # Configure any IPX addresses for interface $ifn. Returns 0 if IPX
 333 # arguments were found and configured; returns 1 otherwise.
 334 #
 335 ipx_up()
 336 {
 337         ifn="$1"
 338         eval ifconfig_args=\$ifconfig_${ifn}_ipx
 339         if [ -n "${ifconfig_args}" ]; then
 340                 ifconfig ${ifn} ${ifconfig_args}
 341                 return 0
 342         fi
 343         return 1
 344 }
 345
 346 # ipx_down ifn
 347 #       Remove IPX addresses for interface $ifn. Returns 0 if IPX
 348 #       addresses were found and unconfigured. It returns 1, otherwise.
 349 #
 350 ipx_down()
 351 {
 352         [ -z "$1" ] && return 1
 353         _ifs="^"
 354         _ret=1
 355
 356         ipxList="`ifconfig $1 | grep 'ipx ' | tr "\n" "$_ifs"`"
 357
 358         oldifs="$IFS"
 359         IFS="$_ifs"
 360         for _ipx in $ipxList ; do
 361                 # get rid of extraneous line
 362                 [ -z "$_ipx" ] && break
 363
 364                 _ipx=`expr "$_ipx" : '.*\(ipx [0-9a-h]\{1,8\}H*\.[0-9a-h]\{1,12\}\).*'`
 365
 366                 IFS="$oldifs"
 367                 ifconfig $1 ${_ipx} delete
 368                 IFS="$_ifs"
 369                 _ret=0
 370         done
 371         IFS="$oldifs"
 372
 373         return $_ret
 374 }
 375
 376 # ifnet_rename
 377 #       Rename all requested interfaces.
 378 #
 379 ifnet_rename()
 380 {
 381
 382         _ifn_list="`ifconfig -l`"
 383         [ -z "$_ifn_list" ] && return 0
 384         for _if in ${_ifn_list} ; do
 385                 eval _ifname=\$ifconfig_${_if}_name
 386                 if [ ! -z "$_ifname" ]; then
 387                         ifconfig $_if name $_ifname
 388                 fi
 389         done
 390         return 0
 391 }
 392
 393 #
 394 # list_net_interfaces type
 395 #       List all network interfaces. The type of interface returned
 396 #       can be controlled by the type argument. The type
 397 #       argument can be any of the following:
 398 #               nodhcp - all interfaces, excluding DHCP configured interfaces
 399 #               dhcp   - list only DHCP configured interfaces
 400 #       If no argument is specified all network interfaces are output.
 401 #       Note that the list will include cloned interfaces if applicable.
 402 #       Cloned interfaces must already exist to have a chance to appear
 403 #       in the list if ${network_interfaces} is set to `auto'.
 404 #
 405 list_net_interfaces()
 406 {
 407         type=$1
 408
 409         # Get a list of ALL the interfaces.  NOTE: cloned interfaces
 410         # have already been configured so they should show up in the
 411         # ifconfig -l output.
 412         #
 413         case ${network_interfaces} in
 414         [Aa][Uu][Tt][Oo])
 415                 _tmplist="`ifconfig -l`"
 416                 ;;
 417         *)
 418                 _tmplist="${network_interfaces} ${cloned_interfaces}"
 419                 ;;
 420         esac
 421
 422         if [ -z "$type" ]; then
 423                 echo $_tmplist
 424                 return 0
 425         fi
 426
 427         # Separate out dhcp and non-dhcp interfaces
 428         #
 429         _aprefix=
 430         _bprefix=
 431         for _if in ${_tmplist} ; do
 432                 eval _ifarg="\$ifconfig_${_if}"
 433                 case "$_ifarg" in
 434                 [Dd][Hh][Cc][Pp])
 435                         _dhcplist="${_dhcplist}${_aprefix}${_if}"
 436                         [ -z "$_aprefix" ] && _aprefix=' '
 437                         ;;
 438                 ''|*)
 439                         _nodhcplist="${_nodhcplist}${_bprefix}${_if}"
 440                         [ -z "$_bprefix" ] && _bprefix=' '
 441                         ;;
 442                 esac
 443         done
 444
 445         case "$type" in
 446         nodhcp)
 447                 echo $_nodhcplist
 448                 ;;
 449         dhcp)
 450                 echo $_dhcplist
 451                 ;;
 452         esac
 453         return 0
 454 }
 455
 456 hexdigit()
 457 {
 458         if [ $1 -lt 10 ]; then
 459                 echo $1
 460         else
 461                 case $1 in
 462                 10)     echo a ;;
 463                 11)     echo b ;;
 464                 12)     echo c ;;
 465                 13)     echo d ;;
 466                 14)     echo e ;;
 467                 15)     echo f ;;
 468                 esac
 469         fi
 470 }
 471
 472 hexprint()
 473 {
 474         val=$1
 475         str=''
 476
 477         dig=`hexdigit $((${val} & 15))`
 478         str=${dig}${str}
 479         val=$((${val} >> 4))
 480         while [ ${val} -gt 0 ]; do
 481                 dig=`hexdigit $((${val} & 15))`
 482                 str=${dig}${str}
 483                 val=$((${val} >> 4))
 484         done
 485
 486         echo ${str}
 487 }
 488
 489 # Setup the interfaces for IPv6
 490 network6_interface_setup()
 491 {
 492         interfaces=$*
 493         rtsol_interfaces=''
 494         case ${ipv6_gateway_enable} in
 495         [Yy][Ee][Ss])
 496                 rtsol_available=no
 497                 ;;
 498         *)
 499                 rtsol_available=yes
 500                 ;;
 501         esac
 502         for i in $interfaces; do
 503                 rtsol_interface=yes
 504                 eval prefix=\$ipv6_prefix_$i
 505                 if [ -n "${prefix}" ]; then
 506                         rtsol_available=no
 507                         rtsol_interface=no
 508                         laddr=`network6_getladdr $i`
 509                         hostid=`expr "${laddr}" : 'fe80::\(.*\)%\(.*\)'`
 510                         for j in ${prefix}; do
 511                                 address=$j\:${hostid}
 512                                 ifconfig $i inet6 ${address} prefixlen 64 alias
 513
 514                                 case ${ipv6_gateway_enable} in
 515                                 [Yy][Ee][Ss])
 516                                         # subnet-router anycast address
 517                                         # (rfc2373)
 518                                         ifconfig $i inet6 $j:: prefixlen 64 \
 519                                                 alias anycast
 520                                         ;;
 521                                 esac
 522                         done
 523                 fi
 524                 eval ipv6_ifconfig=\$ipv6_ifconfig_$i
 525                 if [ -n "${ipv6_ifconfig}" ]; then
 526                         rtsol_available=no
 527                         rtsol_interface=no
 528                         ifconfig $i inet6 ${ipv6_ifconfig} alias
 529                 fi
 530
 531                 if [ ${rtsol_available} = yes -a ${rtsol_interface} = yes ]
 532                 then
 533                         case ${i} in
 534                         lo0|gif[0-9]*|stf[0-9]*|faith[0-9]*|lp[0-9]*|sl[0-9]*|tun[0-9]*)
 535                                 ;;
 536                         *)
 537                                 rtsol_interfaces="${rtsol_interfaces} ${i}"
 538                                 ;;
 539                         esac
 540                 else
 541                         ifconfig $i inet6
 542                 fi
 543         done
 544
 545         if [ ${rtsol_available} = yes -a -n "${rtsol_interfaces}" ]; then
 546                 # Act as endhost - automatically configured.
 547                 # You can configure only single interface, as
 548                 # specification assumes that autoconfigured host has
 549                 # single interface only.
 550                 sysctl net.inet6.ip6.accept_rtadv=1
 551                 set ${rtsol_interfaces}
 552                 ifconfig $1 up
 553                 rtsol $1
 554         fi
 555
 556         for i in $interfaces; do
 557                 alias=0
 558                 while : ; do
 559                         eval ipv6_ifconfig=\$ipv6_ifconfig_${i}_alias${alias}
 560                         if [ -z "${ipv6_ifconfig}" ]; then
 561                                 break;
 562                         fi
 563                         ifconfig $i inet6 ${ipv6_ifconfig} alias
 564                         alias=$((${alias} + 1))
 565                 done
 566         done
 567 }
 568
 569 # Setup IPv6 to IPv4 mapping
 570 network6_stf_setup()
 571 {
 572         case ${stf_interface_ipv4addr} in
 573         [Nn][Oo] | '')
 574                 ;;
 575         *)
 576                 # assign IPv6 addr and interface route for 6to4 interface
 577                 stf_prefixlen=$((16+${stf_interface_ipv4plen:-0}))
 578                 OIFS="$IFS"
 579                 IFS=".$IFS"
 580                 set ${stf_interface_ipv4addr}
 581                 IFS="$OIFS"
 582                 hexfrag1=`hexprint $(($1*256 + $2))`
 583                 hexfrag2=`hexprint $(($3*256 + $4))`
 584                 ipv4_in_hexformat="${hexfrag1}:${hexfrag2}"
 585                 case ${stf_interface_ipv6_ifid} in
 586                 [Aa][Uu][Tt][Oo] | '')
 587                         for i in ${ipv6_network_interfaces}; do
 588                                 laddr=`network6_getladdr ${i}`
 589                                 case ${laddr} in
 590                                 '')
 591                                         ;;
 592                                 *)
 593                                         break
 594                                         ;;
 595                                 esac
 596                         done
 597                         stf_interface_ipv6_ifid=`expr "${laddr}" : \
 598                                                       'fe80::\(.*\)%\(.*\)'`
 599                         case ${stf_interface_ipv6_ifid} in
 600                         '')
 601                                 stf_interface_ipv6_ifid=0:0:0:1
 602                                 ;;
 603                         esac
 604                         ;;
 605                 esac
 606                 ifconfig stf0 create >/dev/null 2>&1
 607                 ifconfig stf0 inet6 2002:${ipv4_in_hexformat}:${stf_interface_ipv6_slaid:-0}:${stf_interface_ipv6_ifid} \
 608                         prefixlen ${stf_prefixlen}
 609                 # disallow packets to malicious 6to4 prefix
 610                 route add -inet6 2002:e000:: -prefixlen 20 ::1 -reject
 611                 route add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject
 612                 route add -inet6 2002:0000:: -prefixlen 24 ::1 -reject
 613                 route add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject
 614                 ;;
 615         esac
 616 }
 617
 618 # Setup static routes
 619 network6_static_routes_setup()
 620 {
 621         # Set up any static routes.
 622         case ${ipv6_defaultrouter} in
 623         [Nn][Oo] | '')
 624                 ;;
 625         *)
 626                 ipv6_static_routes="default ${ipv6_static_routes}"
 627                 ipv6_route_default="default ${ipv6_defaultrouter}"
 628                 ;;
 629         esac
 630         case ${ipv6_static_routes} in
 631         [Nn][Oo] | '')
 632                 ;;
 633         *)
 634                 for i in ${ipv6_static_routes}; do
 635                         eval ipv6_route_args=\$ipv6_route_${i}
 636                         route add -inet6 ${ipv6_route_args}
 637                 done
 638                 ;;
 639         esac
 640 }
 641
 642 # Setup faith
 643 network6_faith_setup()
 644 {
 645         case ${ipv6_faith_prefix} in
 646         [Nn][Oo] | '')
 647                 ;;
 648         *)
 649                 sysctl net.inet6.ip6.keepfaith=1
 650                 ifconfig faith0 create >/dev/null 2>&1
 651                 ifconfig faith0 up
 652                 for prefix in ${ipv6_faith_prefix}; do
 653                         prefixlen=`expr "${prefix}" : ".*/\(.*\)"`
 654                         case ${prefixlen} in
 655                         '')
 656                                 prefixlen=96
 657                                 ;;
 658                         *)
 659                                 prefix=`expr "${prefix}" : \
 660                                              "\(.*\)/${prefixlen}"`
 661                                 ;;
 662                         esac
 663                         route add -inet6 ${prefix} -prefixlen ${prefixlen} ::1
 664                         route change -inet6 ${prefix} -prefixlen ${prefixlen} \
 665                                 -ifp faith0
 666                 done
 667                 ;;
 668         esac
 669 }
 670
 671 # Install the "default interface" to kernel, which will be used
 672 # as the default route when there's no router.
 673 network6_default_interface_setup()
 674 {
 675         # Choose IPv6 default interface if it is not clearly specified.
 676         case ${ipv6_default_interface} in
 677         '')
 678                 for i in ${ipv6_network_interfaces}; do
 679                         case $i in
 680                         lo0|faith[0-9]*)
 681                                 continue
 682                                 ;;
 683                         esac
 684                         laddr=`network6_getladdr $i exclude_tentative`
 685                         case ${laddr} in
 686                         '')
 687                                 ;;
 688                         *)
 689                                 ipv6_default_interface=$i
 690                                 break
 691                                 ;;
 692                         esac
 693                 done
 694                 ;;
 695         esac
 696
 697         # Disallow unicast packets without outgoing scope identifiers,
 698         # or route such packets to a "default" interface, if it is specified.
 699         route add -inet6 fe80:: -prefixlen 10 ::1 -reject
 700         case ${ipv6_default_interface} in
 701         [Nn][Oo] | '')
 702                 route add -inet6 ff02:: -prefixlen 16 ::1 -reject
 703                 ;;
 704         *)
 705                 laddr=`network6_getladdr ${ipv6_default_interface}`
 706                 route add -inet6 ff02:: ${laddr} -prefixlen 16 -interface \
 707                         -cloning
 708
 709                 # Disable installing the default interface with the
 710                 # case net.inet6.ip6.forwarding=0 and
 711                 # net.inet6.ip6.accept_rtadv=0, due to avoid conflict
 712                 # between the default router list and the manual
 713                 # configured default route.
 714                 case ${ipv6_gateway_enable} in
 715                 [Yy][Ee][Ss])
 716                         ;;
 717                 *)
 718                         if [ `sysctl -n net.inet6.ip6.accept_rtadv` -eq 1 ]
 719                         then
 720                                 ndp -I ${ipv6_default_interface}
 721                         fi
 722                         ;;
 723                 esac
 724                 ;;
 725         esac
 726 }
 727
 728 network6_getladdr()
 729 {
 730         ifconfig $1 2>/dev/null | while read proto addr rest; do
 731                 case ${proto} in
 732                 inet6)
 733                         case ${addr} in
 734                         fe80::*)
 735                                 if [ -z "$2" ]; then
 736                                         echo ${addr}
 737                                         return
 738                                 fi
 739                                 case ${rest} in
 740                                 *tentative*)
 741                                         continue
 742                                         ;;
 743                                 *)
 744                                         echo ${addr}
 745                                         return
 746                                 esac
 747                         esac
 748                 esac
 749         done
 750 }