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#!/bin/sh
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#
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# ip-down.ipv6to4
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#
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#
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# Taken from:
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# (P) & (C) 2000-2005 by Peter Bieringer <pb@bieringer.de>
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#
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# You will find more information on the initscripts-ipv6 homepage at
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# http://www.deepspace6.net/projects/initscripts-ipv6.html
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#
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# Version 2005-09-22
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#
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# Calling parameters:
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# $1: interface name
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#
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# Called (mostly) by /etc/ppp/ip-down.local
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# like: /etc/ppp/ip-down.ipv6to4 $1 >>/var/log/ppp-ipv6to4.log 2>&1
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#
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# Note: this script will *check* whether the existing 6to4 tunnel
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# was set before by using "ip-up.ipv6to4" comparing IPv4 address
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# of device with the generated 6to4 prefix
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#
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# Uses following information from /etc/sysconfig/network-scripts/ifcfg-$1:
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# IPV6TO4INIT=yes|no: controls configuration
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# IPV6TO4_ROUTING="<device>-<suffix>/<prefix length> ...": information to setup additional interfaces
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#
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# IPV6_CONTROL_RADVD=yes|no: controls radvd triggering
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# IPV6_RADVD_PIDFILE=<file>: PID file of radvd for sending signals, default is "/var/run/radvd/radvd.pid"
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# IPV6_RADVD_TRIGGER_ACTION=startstop|reload|restart|SIGHUP: how to trigger radvd (optional, default is SIGHUP)
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#
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if [ -z "$1" ]; then
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echo $"Argument 1 is empty but should contain interface name - skip IPv6to4 initialization"
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exit 1
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fi
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# Get global network configuration
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. /etc/sysconfig/network
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# Source IPv4 helper functions
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cd /etc/sysconfig/network-scripts
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. ./network-functions
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CONFIG=$1
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[ -f "$CONFIG" ] || CONFIG=ifcfg-$CONFIG
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source_config
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# IPv6 don't need aliases anymore, config is skipped
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REALDEVICE=${DEVICE%%:*}
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[ "$DEVICE" != "$REALDEVICE" ] && exit 0
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if [ ! -f /etc/sysconfig/network-scripts/network-functions-ipv6 ]; then
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exit 1
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fi
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. /etc/sysconfig/network-scripts/network-functions-ipv6
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# Run basic IPv6 test, if not ok, skip IPv6 initialization
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ipv6_test testonly || exit 0
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# Test status of ppp device
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ipv6_test_device_status $DEVICE
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if [ $? != 0 -a $? != 11 ]; then
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# device doesn't exist or other problem occurs
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exit 1
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fi
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# Test status of tun6to4 device
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ipv6_test_device_status tun6to4
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if [ $? = 0 -o $? = 11 ]; then
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# Device exists
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valid6to4config="yes"
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# Get IPv4 address from interface
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ipv4addr="$(ipv6_get_ipv4addr_of_device $DEVICE)"
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if [ -z "$ipv4addr" ]; then
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# Has no IPv4 address
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valid6to4config="no"
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fi
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# Get local IPv4 address of dedicated tunnel
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ipv4addr6to4local="$(ipv6_get_ipv4addr_of_tunnel tun6to4 local)"
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# IPv6to4 not enabled on this interface?
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if [ $IPV6TO4INIT != "yes" ]; then
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# Check against configured 6to4 tunnel to see if this interface was regardless used before
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if [ "$ipv4addr" != "$ipv4addr6to4local" ]; then
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# IPv4 address of interface does't match local tunnel address, interface was not used for current 6to4 setup
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valid6to4config="no"
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fi
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fi
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fi
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if [ "$valid6to4config" = "yes" ]; then
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if [ "$IPV6_CONTROL_RADVD" = "yes" ]; then
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# Control running radvd
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ipv6_trigger_radvd down "$IPV6_RADVD_TRIGGER_ACTION" $IPV6_RADVD_PIDFILE
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fi
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if [ -n "$IPV6TO4_ROUTING" ]; then
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# Delete routes to local networks
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for devsuf in $IPV6TO4_ROUTING; do
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dev="${devsuf%%-*}"
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ipv6_cleanup_6to4_device $dev
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done
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fi
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# Delete all configured 6to4 address
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ipv6_cleanup_6to4_tunnels tun6to4
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fi
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