#!/bin/sh
#
# init.ipv6-global
#
#
# Taken from: init.ipv6-global
# (P) & (C) 2001-2002 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
#
# Calling parameters:
#  $1: action (currently supported: start|stop|showsysctl)
#  $2: position for start|stop (currently supported: pre|post)
#
# Called by hooks from /etc/[rc.d/]init.d/network
#
# Uses following information from /etc/sysconfig/network:
#  NETWORKING_IPV6=yes|no: controls global IPv6 initialization (default: no)
#  IPV6FORWARDING=yes|no: controls global IPv6 forwarding (default: no)
#  IPV6_AUTOCONF=yes|no: controls global automatic IPv6 configuration
#   (default: yes if IPV6FORWARDING=no, no if IPV6FORWARDING=yes)
#  IPV6_AUTOTUNNEL=yes|no: controls automatic IPv6 tunneling (default: no)
#  IPV6_DEFAULTGW=<ipv6address[%interface]> [optional]
#  IPV6_DEFAULTDEV=<interface> [optional]
#



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

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

# Get action and hook position
ACTION="$1"
POSITION="$2"

# 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


# Initialize IPv6, depending on caller option
case $ACTION in
    start)
	case $POSITION in 
	    pre)
		# IPv6 test, module loaded, exit if system is not IPv6-ready
		ipv6_test || exit 1


		if [ "$IPV6FORWARDING" = "yes" ]; then
			ipv6_global_forwarding=1
			ipv6_global_auto=0
		else
			ipv6_global_forwarding=0
			if [ "$IPV6_AUTOCONF" = "no" ]; then
				ipv6_global_auto=0
			else
				ipv6_global_auto=1
			fi
		fi

		# Reset IPv6 sysctl switches for "all", "default" and still existing devices
		sysctl -a | grep "^net\.ipv6\.conf\." | awk -F. '{ print $4 }' | sort | uniq | while read interface; do
			# Host/Router behaviour for the interface
			ipv6_exec_sysctl -w net.ipv6.conf.$interface.forwarding=$ipv6_global_forwarding >/dev/null

			# Autoconfiguration and redirect handling for Hosts
			ipv6_exec_sysctl -w net.ipv6.conf.$interface.accept_ra=$ipv6_global_auto >/dev/null
			ipv6_exec_sysctl -w net.ipv6.conf.$interface.accept_redirects=$ipv6_global_auto >/dev/null
		done
		;;

	    post)
		# IPv6 test, module loaded, exit if system is not IPv6-ready
		ipv6_test || exit 1


		if [ "$IPV6_AUTOTUNNEL" = "yes" ]; then
			ipv6_enable_autotunnel
			# autotunnel interface doesn't require a MTU setup
		fi

		## Add some routes which should never appear on the wire
		# Unreachable IPv4-only addresses, normally blocked by source address selection
		ipv6_exec_ip route add unreach  ::ffff:0.0.0.0/96
		# Unreachable IPv4-mapped addresses
		ipv6_exec_ip route add unreach  ::0.0.0.0/96
		# Unreachable 6to4: IPv4 multicast, reserved, limited broadcast
		ipv6_exec_ip route add unreach  2002:e000::/19
		# Unreachable 6to4: IPv4 loopback
		ipv6_exec_ip route add unreach  2002:7f00::/24
		# Unreachable 6to4: IPv4 private (RFC 1918)
		ipv6_exec_ip route add unreach  2002:0a00::/24
		ipv6_exec_ip route add unreach  2002:ac10::/28
		ipv6_exec_ip route add unreach  2002:c0a8::/32
		# Unreachable 6to4: IPv4 private (APIPA / DHCP link-local)
		ipv6_exec_ip route add unreach  2002:a9fe::/32
		# Unreachable IPv6: 6bone test addresses
		ipv6_exec_ip route add unreach  3ffe:ffff::/32

		# Set default route for autotunnel, if specified
		if [ "$IPV6_DEFAULTDEV" = "sit0" -a "$IPV6_AUTOTUNNEL" = "yes" ]; then
			if [ ! -z "$IPV6_DEFAULTGW" ]; then
				ipv6_set_default_route $IPV6_DEFAULTGW $IPV6_DEFAULTDEV sit0
			elif [ ! -z "$IPV6_DEFAULTDEV" ]; then
				ipv6_set_default_route "" $IPV6_DEFAULTDEV sit0
			fi
		fi
		;;

	    *)
		echo "Usage: $0 $1 {pre|post}"
		;;

	esac
	;;

    stop)
	case $POSITION in 
	    pre)
		# IPv6 test, no module loaded, exit if system is not IPv6-ready
		ipv6_test testonly || exit 0


		;;

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


		sysctl -a | grep "^net\.ipv6\.conf\." | awk -F. '{ print $4 }' | sort | uniq | while read interface; do
			# Assume Host behaviour
			ipv6_exec_sysctl -w net.ipv6.conf.$interface.forwarding=0 >/dev/null  

			# Disable autoconfiguration and redirects
			ipv6_exec_sysctl -w net.ipv6.conf.$interface.accept_ra=0 >/dev/null  
			ipv6_exec_sysctl -w net.ipv6.conf.$interface.accept_redirects=0 >/dev/null  
		done

		# Cleanup still existing tunnel devices
		ipv6_cleanup_tunnel_devices

		# Shut down generic tunnel interface now
		ipv6_exec_ifconfig sit0 down
		;;

	    *)
		echo "Usage: $0 $1 {pre|post}"
		;;

	esac	
	;;

    restart|reload)
	# do nothing, will be handled by main script
	;;

    showsysctl)
	# Run only basic tests, no module is loaded, if not ok, skip IPv6 initialization
	ipv6_test testonly || exit 0

	# Show sysctl switches 
	sysctl -a | grep "^net\.ipv6\.conf\.default\." | awk -F. '{ print $5 }' | awk -F= '{ print $1 }' | sed 's/ //g' | while read switch; do
		sysctl -a | grep "^net\.ipv6\.conf\." | awk -F. '{ print $4 }' | sort | uniq | while read interface; do
			sysctl net.ipv6.conf.$interface.$switch
		done
		echo
	done
	;;

    *)
	echo $"Usage: $0 {start|stop|reload|restart|showsysctl}"
	exit 1
	;;	

esac