source: projects/initscripts/tags/initscripts-8.91.3/ppp/ip-down.ipv6to4 @ 1108

#!/bin/sh
#
# ip-down.ipv6to4
#
#
# Taken from:
# (P) & (C) 2000-2005 by Peter Bieringer <pb@bieringer.de>
#
#  You will find more information on the initscripts-ipv6 homepage at
#   http://www.deepspace6.net/projects/initscripts-ipv6.html
#
# Version 2005-09-22
#
# Calling parameters:
#  $1: interface name
#
# Called (mostly) by /etc/ppp/ip-down.local
#  like: /etc/ppp/ip-down.ipv6to4 $1 >>/var/log/ppp-ipv6to4.log 2>&1
#
# Note: this script will *check* whether the existing 6to4 tunnel
#        was set before by using "ip-up.ipv6to4" comparing IPv4 address
#        of device with the generated 6to4 prefix
#
# Uses following information from /etc/sysconfig/network-scripts/ifcfg-$1:
#  IPV6TO4INIT=yes|no: controls configuration
#  IPV6TO4_ROUTING="<device>-<suffix>/<prefix length> ...": information to setup additional interfaces
#
#  IPV6_CONTROL_RADVD=yes|no: controls radvd triggering
#  IPV6_RADVD_PIDFILE=<file>: PID file of radvd for sending signals, default is "/var/run/radvd/radvd.pid"
#  IPV6_RADVD_TRIGGER_ACTION=startstop|reload|restart|SIGHUP: how to trigger radvd (optional, default is SIGHUP)
#


if [ -z "$1" ]; then
        echo $"Argument 1 is empty but should contain interface name - skip IPv6to4 initialization"
        exit 1
fi

# Get global network configuration
. /etc/sysconfig/network

# Source IPv4 helper functions
cd /etc/sysconfig/network-scripts
. ./network-functions

CONFIG=$1
[ -f "$CONFIG" ] || CONFIG=ifcfg-$CONFIG
source_config

# IPv6 don't need aliases anymore, config is skipped
REALDEVICE=`echo ${DEVICE} | sed 's/:.*//g'`
[ "$DEVICE" != "$REALDEVICE" ] && exit 0

if [ ! -f /etc/sysconfig/network-scripts/network-functions-ipv6 ]; then
        exit 1
fi

. /etc/sysconfig/network-scripts/network-functions-ipv6


# Run basic IPv6 test, if not ok, skip IPv6 initialization
ipv6_test testonly || exit 0

# Test status of ppp device
ipv6_test_device_status $DEVICE
if [ $? != 0 -a $? != 11 ]; then
        # device doesn't exist or other problem occurs
        exit 1
fi

# Test status of tun6to4 device
ipv6_test_device_status tun6to4
if [ $? = 0 -o $? = 11 ]; then
        # Device exists
        valid6to4config="yes"

        # Get IPv4 address from interface
        ipv4addr="`ipv6_get_ipv4addr_of_device $DEVICE`"
        if [ -z "$ipv4addr" ]; then
                # Has no IPv4 address
                valid6to4config="no"
        fi

        # Get local IPv4 address of dedicated tunnel
        ipv4addr6to4local="`ipv6_get_ipv4addr_of_tunnel tun6to4 local`"

        # IPv6to4 not enabled on this interface?
        if [ $IPV6TO4INIT != "yes" ]; then
                # Check against configured 6to4 tunnel to see if this interface was regardless used before
                if [ "$ipv4addr" != "$ipv4addr6to4local" ]; then
                        # IPv4 address of interface does't match local tunnel address, interface was not used for current 6to4 setup
                        valid6to4config="no"
                fi
        fi

fi

if [ "$valid6to4config" = "yes" ]; then
        if [ "$IPV6_CONTROL_RADVD" = "yes" ]; then
                # Control running radvd
                ipv6_trigger_radvd down "$IPV6_RADVD_TRIGGER_ACTION" $IPV6_RADVD_PIDFILE
        fi

        if [ -n "$IPV6TO4_ROUTING" ]; then
                # Delete routes to local networks
                for devsuf in $IPV6TO4_ROUTING; do
                        dev="`echo $devsuf | awk -F- '{ print $1 }'`"
                        ipv6_cleanup_6to4_device $dev
                done
        fi

        # Delete all configured 6to4 address
        ipv6_cleanup_6to4_tunnels tun6to4
fi