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dhcp/dhclient-script

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#!/bin/bash
#
# Copyright (C) 2010-2013 SUSE LINUX Products GmbH / Novell Inc.
# Copyright (C) 2013-2014 SUSE LINUX GmbH
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, see <http://www.gnu.org/licenses/>.
#
# Author: Marius Tomaschewski <mt@suse.de>
#
# /sbin/dhclient-script for openSUSE / SUSE Linux Enterprise Server
# based on the scripts shipped with the ISC DHCP (4.1.1) client.
#
# Note:
# It is used by sysconfig alias netcontrol alias ifup-dhcp,
# but not by the NetworkManager that is using an own script.
#
# Wicked is using an another dhcp client (runtime conflict).
# As sysconfig-network is gone on sles12 and opensuse > 13.1,
# this script is obsolete and unsupported.
#
##
## check mandatory parameters or ignore & exit
##
test "x$reason" = x -o "x$interface" = x && exit 1
#
# source sysconfig functions
#
SYSCONFIG_CFG_DIR="/etc/sysconfig/network"
if test -f "$SYSCONFIG_CFG_DIR/scripts/functions" ; then
. "$SYSCONFIG_CFG_DIR/scripts/functions"
fi
SYSCONFIG_RUN_DIR=${SYSCONFIG_RUN_DIR:-/dev/.sysconfig/network}
#
# Debugging:
# logs entire run of dhclient-script to /var/log/${dhclient}-script.*.log,
# when DHCLIENT_DEBUG/DHCLIENT6_DEBUG are "yes" in sysconfig/network/dhcp
#
eval `grep '^DHCLIENT6\?_DEBUG=' "$SYSCONFIG_CFG_DIR/dhcp" 2>/dev/null`
case $reason in
*6) DEBUG=$DHCLIENT6_DEBUG ; dhclient=dhclient6 ; ipver=6 ;;
*) DEBUG=$DHCLIENT_DEBUG ; dhclient=dhclient ; ipver=4 ;;
esac
if [ "$DEBUG" = yes ]; then
set -a # allexport
(
echo '****************'
echo "$0 $*"
date
echo '----------------'
env
echo '----------------'
) >> /var/log/${dhclient}-script.$interface.log
exec 2>> /var/log/${dhclient}-script.$interface.log
set +a
set -x
fi
network_service_conflicts()
{
local _id=`/usr/bin/systemctl --no-pager -p Id show network.service 2>/dev/null`
case "${_id#Id=}" in
# wicked is using an another dhcp client - dhclient
# is not supported with enabled wicked and disabled.
wicked.service)
logger -t "${0##*/}" -p daemon.error -- \
"dhclient conflicts with enabled ${_id#Id=} and disabled"
return 1
;;
# NetworkManager is using an another script
# [disarmed except maintainer requests it]
#NetworkManager.service)
# logger -t "${0##*/}" -p daemon.error -- \
# "dhclient-script conflicts with enabled ${_id#Id=} script and disabled"
# return 1
#;;
# sysconfig network [gone] were using it, other?
network.service|*)
return 0
;;
esac
}
network_service_conflicts || exit 1
is_ifup_controlled()
{
test -f "$SYSCONFIG_RUN_DIR/if-${interface}"
}
# netconfig makes all "additional" modifications as DNS or NTP
netconfig_modify() {
if test -x /sbin/netconfig -a -n "$interface" ; then
{
echo "INTERFACE='$interface'"
for v in ${!new_*}; do
case $ipver in
6)
case $v in
(new_ip6_address) k='IPADDR' ;;
(new_ip6_prefixlen) k='PREFIXLEN' ;;
(new_dhcp6_client_id) k='DHCP6CID' ;;
(new_dhcp6_server_id) k='DHCP6SID' ;;
(new_dhcp6_domain_search) k='DNSSEARCH' ;;
(new_dhcp6_name_servers) k='DNSSERVERS' ;;
(new_dhcp6_sntp_servers) k='NTPSERVERS' ;;
#(new_dhcp6_nis_domain) k='NISDOMAIN' ;;
#(new_dhcp6_nis_servers) k='NISSERVERS' ;;
(*) k="dhclient6_${v#new_}" ;;
esac
;;
4)
case $v in
(new_ip_address) k='IPADDR' ;;
(new_subnet_mask) k='NETMASK' ;;
(new_network_number) k='NETWORK' ;;
(new_broadcast_address) k='BROADCAST' ;;
(new_interface_mtu) k='MTU' ;;
(new_rfc3442_classless_static_routes_formatted)
k='ROUTES' ;;
# (new_static_routes) k='ROUTES' ;;
(new_routers) k='GATEWAYS' ;;
(new_host_name) k='HOSTNAME' ;;
(new_domain_search) k='DNSSEARCH' ;;
(new_domain_name) k='DNSDOMAIN' ;;
(new_domain_name_servers) k='DNSSERVERS' ;;
(new_ntp_servers) k='NTPSERVERS' ;;
(new_nis_domain) k='NISDOMAIN' ;;
(new_nis_servers) k='NISSERVERS' ;;
(new_root_path) k='ROOTPATH' ;;
(new_dhcp_server_identifier)k='DHCPSID' ;;
(new_lpr_servers) k='LPRSERVER' ;;
(new_log_servers) k='LOGSERVER' ;;
(new_netbios_dd_server) k='NETBIOSDDSERVER' ;;
(new_netbios_name_servers) k='NETBIOSNAMESERVER' ;;
(new_netbios_node_type) k='NETBIOSNODETYPE' ;;
(new_netbios_scope) k='NETBIOSSCOPE' ;;
(*) k="dhclient_${v#new_}" ;;
esac
esac
[ "k${k}" != k ] && echo "${k}='${!v}'"
done
} | /sbin/netconfig modify -s "dhclient$ipver" -i "$interface"
fi
}
netconfig_remove() {
if test -x /sbin/netconfig -a -n "$interface" ; then
/sbin/netconfig remove -s "dhclient$ipver" -i "$interface" </dev/null
fi
}
prefixlen2netmask()
{
test -n "$1" || return 1
local o i n=0 adr=() len=$(($1))
for o in 0 1 2 3; do
adr[$o]=0
for i in 128 64 32 16 8 4 2 1; do
((n++ < len)) && \
((adr[$o] = ${adr[$o]} + $i))
done
done
echo ${adr[0]}.${adr[1]}.${adr[2]}.${adr[3]}
return 0
}
parse_ipv4_classless_routes()
{
local route_regex='^[0-9]{1,3}([ ][0-9]{1,3}){4,}$'
local rfc_routes=() _routes=()
# check whether it is a list of numbers
[[ $* =~ $route_regex ]] && rfc_routes=($*)
for (( i=0; i < ${#rfc_routes[@]}; )) ; do
net_length=${rfc_routes[$i]}
test $net_length -gt 32 && return 1
((i++))
net_octets=$(($net_length / 8 + ($net_length % 8 ? 1 : 0)))
test ${#rfc_routes[@]} -lt $(( $i + $net_octets + 4 )) && \
return 1
net_netmask=$(prefixlen2netmask $net_length)
net_netmask=(${net_netmask//./ })
net_address=(0 0 0 0)
for(( j=0; j < $net_octets; j++, i++)); do
net_address[$j]=$((${rfc_routes[$i]} & ${net_netmask[$j]}))
done
gateway=(0 0 0 0)
for (( j=0; j < 4; j++, i++ )); do
gateway[$j]=${rfc_routes[$i]}
done
old_IFS=$IFS
IFS='.'
_routes+=("${net_address[*]},${net_netmask[*]},${gateway[*]}")
IFS=$old_IFS
done
echo "${_routes[*]}"
return 0
}
set_ipv4_route()
{
local dest=$1 ; shift
local mask=$1 ; shift
local gate=("$@")
local hops args
hops=()
if [ ${#gate[@]} -gt 1 ] ; then
for((g=0; g<${#gate[@]}; g++)) ; do
hops+=(nexthop ${gate[$g]:+via ${gate[$g]}}
dev $interface weight $((g+1)))
done
elif [ ${#gate[@]} -gt 0 ] ; then
hops+=(${gate[$g]:+via ${gate[$g]}} dev $interface)
fi
[ ${#hops[@]} -eq 0 ] && hops=(dev $interface)
args=("$dest${mask:+/$mask}" $metric_arg ${hops[*]})
err=`LC_ALL=C /sbin/ip route replace ${args[*]} 2>&1` && return 0
case $err in
RTNETLINK*answers:*File*exists) ;;
RTNETLINK*answers:*No*such*process)
#
# The gateway seems to be not reachable via local network
# route (implicitly created by ifconfig based on the IP
# and netmask provided by dhcp).
# Check this, set an explicit host route to the gateway
# over the current interface and try again (bnc#266215).
#
retry=0
for router in ${gate[@]} ; do
matches=$(/sbin/ip -f inet -o route list match $router | \
grep -v ^default | grep -c -v "^$" 2>/dev/null)
if [ -n "$matches" -a $(($matches)) -eq 0 ] ; then
LC_ALL=C /sbin/ip route add $router/32 dev $interface || retry=1
fi
done
if [ $retry -eq 0 ] ; then
LC_ALL=C /sbin/ip route replace ${args[*]} && return 0
fi
;;
esac
return 1
}
get_ipv4_default_gw()
{
if [ "x$new_rfc3442_classless_static_routes_formatted" != x ] ; then
local r route=() gw=()
for r in $new_rfc3442_classless_static_routes_formatted ; do
route=(${r//,/ })
case ${route[0]}/${route[1]} in
0.0.0.0/0.0.0.0)
[ "x${route[2]}" = "x0.0.0.0" ] || \
gw+=(${route[2]})
;;
esac
done
echo "${gw[*]}"
elif [ "$new_routers" != x ] ; then
echo "$new_routers"
fi
}
set_ipv4_routes()
{
if [ "x$new_rfc3442_classless_static_routes_formatted" != x ] ; then
local r route=()
# TODO: multiple gw's to one dest as in $new_routers?
for r in $new_rfc3442_classless_static_routes_formatted ; do
route=(${r//,/ })
case ${route[0]}/${route[1]} in
0.0.0.0/0.0.0.0)
[ "x$DHCLIENT_SET_DEFAULT_ROUTE" = xyes ] || continue ;;
esac
set_ipv4_route ${route[*]}
done
elif [ "$new_routers" != x ] ; then
if [ "x$DHCLIENT_SET_DEFAULT_ROUTE" = xyes ] ; then
set_ipv4_route default "" $new_routers
fi
fi
}
set_hostname()
{
rx_host='^[[:alnum:]][[:alnum:]_-]{0,62}$'
if [ "$DHCLIENT_SET_HOSTNAME" = yes ] ; then
new_host_name="${new_host_name%%.*}"
[[ ${new_host_name} =~ ${rx_host} ]] || unset new_host_name
current_hostname=`hostname`
current_hostname="${current_hostname%%.*}"
[[ ${current_hostname} =~ ${rx_host} ]] || unset current_hostname
if [ "x${current_hostname}" = "x" ] || \
[ "x${current_hostname}" = "xlocalhost" ] || \
[ "x${current_hostname}" != "x${new_host_name}" ]; then
if [ "x${new_host_name}" != "x" ]; then
hostname "${new_host_name}"
else
if [ -x /usr/bin/getent ] ; then
if out=`timeout 2s /usr/bin/getent hosts "$new_ip_address" 2>/dev/null` ; then
_hostname="`echo "$out" | sed 's:^.* ::; s:\..*::; s:.*[)]::'`"
[[ ${_hostname} =~ ${rx_host} ]] || unset _hostname
if [ "x${_hostname}" != "x" -a \
"x${_hostname}" != "x${current_hostname}" ]; then
hostname "${_hostname}"
fi
fi
fi
fi
fi
fi
if is_ifup_controlled ; then
# check regardless the DHCLIENT_SET_HOSTNAME setting
# and whether we've set it above or not, because when
# it changed, we've to handle it anyway...
local OLD_HOSTNAME=`read_cached_config_data hostname $interface`
local CUR_HOSTNAME=`hostname 2>/dev/null`
CUR_HOSTNAME="${CUR_HOSTNAME%%.*}"
if [[ ${CUR_HOSTNAME} =~ ${rx_host} ]] && \
[ "x$OLD_HOSTNAME" != "x$CUR_HOSTNAME" ] ; then
write_cached_config_data hostname "$CUR_HOSTNAME" $interface
commit_cached_config_data $interface
# reload syslog so it knows the new hostname
if test -x /usr/bin/systemctl ; then
/usr/bin/systemctl reload syslog.service
fi
fi
fi
}
dhcp6_dad_check()
{
local ifname="$1" word i
local ipaddr="$2"
local noaddr=1 nodad=0 tentative=0 dadfailed=0
test -n "$ifname" -a -n "$ipaddr" || return 1
while read -a word ; do
test "${word[0]}" != "inet6" && continue
noaddr=0
for((i=2; i<${#word[@]}; ++i)) ; do
case ${word[$i]} in
nodad) nodad=1 ;;
tentative) tentative=1 ;;
dadfailed) dadfailed=1 ;;
flags) ((i++))
rx='^[[:xdigit:]]+$'
[[ "${word[$i]}" =~ $rx ]] || continue
hx="0x${word[$i]}"
((hx & 0x02)) && nodad=1
((hx & 0x08)) && dadfailed=1
((hx & 0x40)) && tentative=1
;;
esac
done
((nodad)) && continue
((dadfailed)) && return 3
((tentative)) && return 2
done < <(LC_ALL=C ip -6 addr show dev "${ifname}" to "${ipaddr}" 2>/dev/null)
# on dad failure of dynamic (non-persistent) address,
# the kernel deletes dad failed addresses
# that is, the address is tentative (2) and vanishes
# (4) and is not visible as dadfailed (3).
((noaddr)) && return 4 || return 0
}
dhcp6_dad_wait()
{
local ifname="$1"
local ipaddr="$2"
local -i wsecs=${3:-0}
local -i uwait=25000
local -i loops=$(((wsecs * 1000000) / uwait))
local -i loop=0 ret=0
dhcp6_dad_check "$ifname" "$ipaddr" ; ret=$?
while ((ret == 2 && loop++ < loops)) ; do
sleep 0.25
dhcp6_dad_check "$ifname" "$ipaddr" ; ret=$?
done
return $ret
}
# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
exit_with_hooks() {
exit_status=$1
if [ -f /etc/${dhclient}-exit-hooks ]; then
. /etc/${dhclient}-exit-hooks
fi
# probably should do something with exit status of the local script
exit $exit_status
}
# Invoke the local dhcp client enter hooks, if they exist.
if [ -f /etc/${dhclient}-enter-hooks ]; then
exit_status=0
. /etc/${dhclient}-enter-hooks
# allow the local script to abort processing of this state
# local script must set exit_status variable to nonzero.
if [ $exit_status -ne 0 ]; then
exit $exit_status
fi
fi
case $dhclient in
dhclient)
if is_ifup_controlled ; then
# STARTMODE
eval `grep --no-filename \
'^[[:space:]]*STARTMODE=' \
"$SYSCONFIG_CFG_DIR/ifcfg-${interface}" 2>/dev/null`
tmp_startmode=`read_cached_config_data startmode $INTERFACE`
[ -n "$tmp_startmode" ] && STARTMODE="$tmp_startmode"
# DHCLIENT_SET_HOSTNAME and DHCLIENT_SET_DEFAULT_ROUTE
if grep -qs '^primary=yes' "$SYSCONFIG_RUN_DIR/if-${interface}" 2>/dev/null ;
then
eval `grep --no-filename \
'^[[:space:]]*DHCLIENT_SET_\(HOSTNAME\|DEFAULT_ROUTE\)=' \
"$SYSCONFIG_CFG_DIR/dhcp" \
"$SYSCONFIG_CFG_DIR/ifcfg-${interface}" 2>/dev/null`
else
eval `grep --no-filename \
'^[[:space:]]*DHCLIENT_SET_\(HOSTNAME\|DEFAULT_ROUTE\)=' \
"$SYSCONFIG_CFG_DIR/ifcfg-${interface}" 2>/dev/null`
fi
else
STARTMODE=manual
eval `grep --no-filename \
'^[[:space:]]*DHCLIENT_SET_\(HOSTNAME\|DEFAULT_ROUTE\)=' \
"$SYSCONFIG_CFG_DIR/dhcp" 2>/dev/null`
fi
if [ "x$new_rfc3442_classless_static_routes" != x ] ; then
new_rfc3442_classless_static_routes_formatted=$(
parse_ipv4_classless_routes $new_rfc3442_classless_static_routes
)
else
unset new_rfc3442_classless_static_routes_formatted
fi
if [ x$new_broadcast_address != x ] ; then
new_broadcast_arg="brd $new_broadcast_address"
elif [ "x$new_subnet_mask" != "x255.255.255.255" ] ; then
new_broadcast_arg="brd +"
fi
if [ x$new_interface_mtu != x -a \
$(( $new_interface_mtu )) -le 576 ] ;
then
# 68 is the minimal legal value, but 576 the real life minimum
unset new_interface_mtu
fi
if [ x$IF_METRIC != x ]; then
metric_arg="metric $IF_METRIC"
fi
;;
dhclient6)
if is_ifup_controlled ; then
# STARTMODE
eval `grep --no-filename \
'^[[:space:]]*STARTMODE=' \
"$SYSCONFIG_CFG_DIR/ifcfg-${interface}" 2>/dev/null`
tmp_startmode=`read_cached_config_data startmode $INTERFACE`
[ -n "$tmp_startmode" ] && STARTMODE="$tmp_startmode"
else
STARTMODE=manual
fi
;;
esac
case $reason in
######################################################################
## DHCPv4 #
######################################################################
MEDIUM)
####################################################################
exit_with_hooks 0
;;
PREINIT)
####################################################################
if [ "x$alias_ip_address" != x ]; then
/sbin/ip addr del $alias_ip_address/$alias_subnet_mask dev $interface
fi
if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -4 addr flush dev $interface
fi
/sbin/ip link set $interface up
# We need to give the kernel some time to get the interface up.
sleep 1
exit_with_hooks 0
;;
ARPCHECK|ARPSEND)
####################################################################
exit_with_hooks 0
;;
BOUND|RENEW|REBIND|REBOOT)
####################################################################
if [ x$alias_ip_address != x -a x$alias_ip_address != x$old_ip_address -a \
x$new_ip_address != x$old_ip_address ] ;
then
# Possible new alias. Remove old alias.
/sbin/ip addr del $alias_ip_address/$alias_subnet_mask dev $interface
fi
if [ x$old_ip_address != x -a x$old_ip_address != x$new_ip_address ]; then
# IP address changed. Flush to clear routes and ARP cache.
if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -4 addr flush dev $interface
fi
fi
if [ x$new_interface_mtu != x ] ; then
/sbin/ip link set $interface mtu $new_interface_mtu
fi
if [ x$new_ip_address != x ] && \
[ x$new_ip_address != x$old_ip_address -o \
x$reason = xBOUND -o x$reason = xREBOOT ]; then
/sbin/ip addr add $new_ip_address/${new_subnet_mask:-32} \
${new_broadcast_arg} \
dev $interface
set_ipv4_routes
fi
if [ x$new_ip_address != x$alias_ip_address -a x$alias_ip_address != x \
-a x$new_ip_address != x$old_ip_address ];
then
/sbin/ip addr add $alias_ip_address/$alias_subnet_mask \
dev $interface
fi
netconfig_modify
if [ x$old_ip_address != x -a x$old_ip_address != x$new_ip_address ]; then
if is_ifup_controlled ; then
ifdown $interface -o dhcp
write_cached_config_data dhcp4_state "up" $interface
commit_cached_config_data $interface
fi
else
if is_ifup_controlled ; then
write_cached_config_data dhcp4_state "new" $interface
commit_cached_config_data $interface
fi
fi
set_hostname
if is_ifup_controlled ; then
# execute ifservice and if-up.d scripts
ifup $interface -o dhcp
write_cached_config_data dhcp4_state "complete" $interface
commit_cached_config_data $interface
fi
exit_with_hooks 0
;;
EXPIRE|FAIL|RELEASE|STOP)
####################################################################
if [ x$old_ip_address != x ]; then
if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -4 addr flush dev $interface
fi
fi
if [ x$alias_ip_address != x ]; then
/sbin/ip addr add $alias_ip_address/$alias_subnet_mask \
dev $interface
fi
if is_ifup_controlled ; then
write_cached_config_data dhcp4_state "down" $interface
commit_cached_config_data $interface
fi
netconfig_remove
exit_with_hooks 0
;;
TIMEOUT)
####################################################################
if [ x$alias_ip_address != x ]; then
/sbin/ip addr del $alias_ip_address/$alias_subnet_mask \
dev $interface
fi
if [ x$new_ip_address != x -a x$old_ip_address != x$new_ip_address ];
then
/sbin/ip addr add $new_ip_address/${new_subnet_mask:-32} \
${new_broadcast_arg} \
dev $interface
set -- $(get_ipv4_default_gw)
if [ -n "$1" ] && /usr/sbin/arping -q -c 1 -w 5 -I $interface $1 ;
then
if [ x$new_ip_address != x$alias_ip_address ] && \
[ x$alias_ip_address != x ]; then
/sbin/ip addr add $alias_ip_address/$alias_subnet_arg
fi
set_ipv4_routes
netconfig_modify
set_hostname
if is_ifup_controlled ; then
# execute ifservice and if-up.d scripts
ifup $interface -o dhcp
write_cached_config_data dhcp4_state "complete" $interface
commit_cached_config_data $interface
fi
exit_with_hooks 0
else
if [ x$old_ip_address != x ]; then
if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -4 addr flush dev $interface
fi
fi
if is_ifup_controlled ; then
write_cached_config_data dhcp4_state "down" $interface
commit_cached_config_data $interface
fi
netconfig_remove
exit_with_hooks 1
fi
fi
;;
######################################################################
## DHCPv6 #
######################################################################
PREINIT6)
####################################################################
if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -6 addr flush dev $interface scope global permanent
fi
/sbin/ip link set $interface up
# We need to give the kernel some time to get the interface up.
sleep 1
exit_with_hooks 0
;;
BOUND6|RENEW6|REBIND6|REBOOT6)
####################################################################
if [ x$old_ip6_address != x -a x$old_ip6_address != x$new_ip6_address ];
then
/sbin/ip addr del "$old_ip6_address/$old_ip6_prefixlen" dev $interface
if is_ifup_controlled ; then
write_cached_config_data dhcp6_state "up" $interface
commit_cached_config_data $interface
fi
else
if is_ifup_controlled ; then
write_cached_config_data dhcp6_state "new" $interface
commit_cached_config_data $interface
fi
fi
if [ "x$new_ip6_address" != x -a "x$new_ip6_prefixlen" != x ] ; then
/sbin/ip addr replace "$new_ip6_address/$new_ip6_prefixlen" \
scope global dev $interface \
${new_max_life:+valid_lft $new_max_life} \
${new_preferred_life:+preferred_lft $new_preferred_life} \
|| exit_with_hooks 2
echo >&2 "Checking DAD results for $new_ip6_address"
if ! dhcp6_dad_wait "$interface" "$new_ip6_address/$new_ip6_prefixlen" 5 ; then
/sbin/ip addr del "$new_ip6_address/$new_ip6_prefixlen" dev $interface 2>/dev/null
exit_with_hooks 3
fi
fi
netconfig_modify
if [ x$old_ip6_address != x -a x$old_ip6_address != x$new_ip6_address ];
then
if is_ifup_controlled ; then
/sbin/ifdown $interface -o dhcp
fi
fi
#set_hostname
if is_ifup_controlled ; then
# execute ifservice and if-up.d scripts
/sbin/ifup $interface -o dhcp
write_cached_config_data dhcp6_state "complete" $interface
commit_cached_config_data $interface
fi
exit_with_hooks 0
;;
DEPREF6)
####################################################################
if [ x$cur_ip6_address = x -o x$cur_ip6_prefixlen = x ] ; then
exit_with_hooks 2
fi
/sbin/ip addr change "$cur_ip6_address/$cur_ip6_prefixlen" \
dev $interface scope global preferred_lft 0
exit_with_hooks 0
;;
EXPIRE6|RELEASE6|STOP6)
####################################################################
if [ x$old_ip6_address != x -a x$old_ip6_prefixlen != x ] ; then
/sbin/ip addr del "$old_ip6_address/$old_ip6_prefixlen" \
dev $interface
fi
if is_ifup_controlled ; then
write_cached_config_data dhcp6_state "down" $interface
commit_cached_config_data $interface
fi
netconfig_remove
exit_with_hooks 0
;;
esac
exit_with_hooks 0
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