#!/bin/sh
#
# ifdown-ipv6
#
#
# Taken from:
# (P) & (C) 2000-2002 by Peter Bieringer <pb@bieringer.de>
#
#  You will find more information in the IPv6-HowTo for Linux at
#   http://www.bieringer.de/linux/IPv6/
#
# RHL integration assistance by Pekka Savola <pekkas@netcore.fi>
#
# Version 2002-01-25
#
# Note: if called as (like normally) by /etc/sysconfig/network-scripts/ifdown
#        exit codes aren't handled by "ifdown"
#
# Uses following information from /etc/sysconfig/network:
#  NETWORKING_IPV6=yes|no: controls IPv6 initialization (global setting)
#
# Uses following information from /etc/sysconfig/network-scripts/ifcfg-$1:
#  DEVICE=<device>
#  IPV6INIT=yes|no: controls IPv6 configuration for this interface
#
# Optional for 6to4 tunneling:
#  IPV6TO4_RELAY=<IPv4 address>: IPv4 address of the remote 6to4 relay [default: 192.88.99.1]
#  IPV6TO4_ROUTING="<device>-<suffix>/<prefix length> ...": information to setup local subnetting
#
# Optional for 6to4 tunneling links to trigger radvd:
#  IPV6_CONTROL_RADVD=yes|no: controls radvd triggering [optional]
#  IPV6_RADVD_PIDFILE=<file>: PID file of radvd for sending signals, default is "/var/run/radvd/radvd.pid" [optional]
#  IPV6_RADVD_TRIGGER_ACTION=startstop|reload|restart|SIGHUP: how to trigger radvd [optional, default is SIGHUP]
#
#  Required version of radvd to use 6to4 prefix recalculation
#   0.6.2p3 or newer supporting option "Base6to4Interface"
#  Required version of radvd to use dynamic ppp links
#   0.7.0 + fixes or newer
#


. /etc/sysconfig/network 

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

# Test whether IPv6 should be configured, else stop
[ "${NETWORKING_IPV6}" = "yes" ] || exit 0

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

# Source IPv6 helper functions
. /etc/sysconfig/network-scripts/network-functions-ipv6


# IPv6 test, no module loaded, exit if system is not IPv6-ready
ipv6_test testonly || exit 0

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

# Switch some sysctls to secure mode
ipv6_exec_sysctl -w net.ipv6.conf.$DEVICE.forwarding=0 >/dev/null
ipv6_exec_sysctl -w net.ipv6.conf.$DEVICE.accept_ra=0 >/dev/null
ipv6_exec_sysctl -w net.ipv6.conf.$DEVICE.accept_redirects=0 >/dev/null

# Shutdown of 6to4, if configured
valid6to4config="yes"
if [ -z "$IPV6TO4_RELAY" ]; then
	IPV6TO4_RELAY="192.88.99.1"
fi

# Get IPv4 address from interface
if [ ! -z "$IPV6TO4_IPV4ADDR" ]; then
	# Take special configured from config file (precedence 1)
	ipv4addr="$IPV6TO4_IPV4ADDR"
else
	# Get IPv4 address from interface first (has precedence 2)
	ipv4addr="`ipv6_get_ipv4addr_of_device $DEVICE`"
	if [ -z "$ipv4addr" ]; then
		# Take configured from config file (precedence 3)
		ipv4addr="$IPADDR"
	fi
fi

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

# Check against configured 6to4 tunnel to see if this interface was 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

# Shutdown of 6to4, if configured
if [ "$valid6to4config" = "yes" ]; then
	if [ ! -z "$IPV6TO4_ROUTING" ]; then
		# Delete routes to local networks
		for devsuf in $IPV6TO4_ROUTING; do
			dev="`echo $devsuf | awk -F- '{ print $1 }'`"
			ipv6_cleanup_routes $dev ::
		done
	fi

	# Delete all configured 6to4 address
	ipv6_cleanup_6to4_tunnels tun6to4 

	# Control running radvd
	ipv6_trigger_radvd down "$IPV6_RADVD_TRIGGER_ACTION" $IPV6_RADVD_PIDFILE
fi

# Delete all current configured IPv6 addresses on this interface 
ipv6_cleanup_device $DEVICE