#!/bin/sh
#
# ifup-ipv6
#
#
# Taken from:
# (P) & (C) 2000-2001 by Peter Bieringer <pb@bieringer.de>
#
# RHL integration assistance by Pekka Savola <pekkas@netcore.fi>
#
# Version 2001-05-22d
#
# 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":
#  IPV6INIT=yes|no: controls IPv6 configuration for this interface
#  IPV6ADDR=<ipv6address>/<prefixlength>: specify primary static IPv6 address here
#  IPV6ADDR_SECONDARIES="<list of ipv6 addresses>" [optional]
#  IPV6_ROUTER=yes|no: controls IPv6 autoconfiguration (no: multi-homed interface without routing)
#  IPV6_AUTOCONF=yes|no: controls IPv6 autoconfiguration
#   defaults:
#    IPV6FORWARDING=yes: IPV6_AUTOCONF=no, IPV6_ROUTER=yes
#    IPV6FORWARDING=no: IPV6_AUTOCONF=yes
#
# Optional for 6to4 tunneling:
#  IPV6TO4INIT=yes|no: controls 6to4 tunneling setup
#  IPV6TO4_RELAY=<ipv4address>: IPv4 address of the remote 6to4 relay
#  IPV6TO4_IPV4ADDR=<ipv6address>: overwrite local IPv4 address [optional]
#  IPV6TO4_ROUTING="eth0-:f101::0/64 eth1-:f102::0/64": information to setup local subnetting
#  IPV6TO4_CONTROL_RADVD=yes|no: controls radvd triggering [optional]
#  IPV6TO4_RADVD_PIDFILE=file: PID file of radvd for sending signals, default is "/var/run/radvd/radvd.pid" [optional]
#
#  Requirements for 6to4 if using radvd:
#   radvd-0.6.2p3 or newer supporting option "Base6to4Interface"
#


# 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  

# Test if IPv6 configuration is enabled
if [ ! "$IPV6INIT" = "yes" ]; then
	# not enabled, stop here
	exit 0
fi                                                  

# Test if IPv6 is up
if [ ! "${NETWORKING_IPV6}" = "yes" ]; then
	# Global IPv6 switch not enabled, end now
	exit 0
fi

if [ ! -f /etc/sysconfig/network-scripts/network-functions-ipv6 ]; then
	# IPv6 setup isn't well
	exit 1
fi

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

# IPv6 test, module loaded, exit if system is not IPv6-ready
test_ipv6 || exit 1

		
# Setup IPv6 address on specified interface
if ! [ -z "$IPV6ADDR" ]; then
	ifup_ipv6_real $DEVICE $IPV6ADDR
fi

# Get current global IPv6 forwarding
ipv6_global_forwarding_current="`sysctl -n net.ipv6.conf.all.forwarding`"

# Set some proc switches depending on defines
if [ "$IPV6FORWARDING" = "yes" ]; then
	# Global forwarding should be enabled

	# Check, if global IPv6 forwarding was already set by global script
	if [ $ipv6_global_forwarding_current -ne 1 ]; then
		# Forwarding enabled, but not set, display warning
		echo $"Global IPv6 forwarding is enabled in configuration, but not currently enabled in kernel"
		echo $"Please restart network with '/etc/rc.d/init.d/network restart'"
	fi

	ipv6_local_forwarding=1
	ipv6_local_auto=0
	if [ "$IPV6_ROUTER" = "no" ]; then
		# Interface should not act as a Router
		ipv6_local_forwarding=0
	fi
	if [ "$IPV6_AUTOCONF" = "yes" ]; then
		# Interface should be autoconfigured
		ipv6_local_auto=1
	fi
else
	# Global forwarding should be disabled

	# Check, if global IPv6 forwarding was already set by global script
	if [ $ipv6_global_forwarding_current -ne 0 ]; then
		# Forwarding disabled, but not set, display warning
		echo $"Global IPv6 forwarding is disabled in configuration, but not currently disabled in kernel"
		echo $"Please restart network with '/etc/rc.d/init.d/network restart'"
	fi

	ipv6_local_forwarding=0
	ipv6_local_auto=1
	if [ "$IPV6_AUTOCONF" = "no" ]; then
		# Interface should not be autoconfigured
		ipv6_local_auto=0
	fi
fi
sysctl -w net.ipv6.conf.$DEVICE.forwarding=$ipv6_local_forwarding >/dev/null
sysctl -w net.ipv6.conf.$DEVICE.accept_ra=$ipv6_local_auto >/dev/null
sysctl -w net.ipv6.conf.$DEVICE.accept_redirects=$ipv6_local_auto >/dev/null

# Setup additional IPv6 addresses from list
if [ ! -z "$IPV6ADDR_SECONDARIES" ]; then
	for ipv6addr in $IPV6ADDR_SECONDARIES; do
		ifup_ipv6_real $DEVICE $ipv6addr
	done
fi

# Setup additional static IPv6 routes on specified interface
if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
	grep "^$DEVICE\W" /etc/sysconfig/static-routes-ipv6 | while read device args; do
		if [ "$device" = "$DEVICE" ]; then
			ifup_ipv6_route $args $DEVICE
		fi
	done
fi

# Setup of 6to4, if configured
if [ "$IPV6TO4INIT" = "yes" ]; then
	valid6to4config="yes"
	if [ ! -z "$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="`LC_ALL=C ifconfig $DEVICE |grep "inet addr:" | tr : " " | awk '{ print $3 }'`"
		if [ -z "$ipv4addr" ]; then
			# Take configured from config file (precedence 3)
			ipv4addr="$IPADDR"
		fi
        fi
	if [ ! -z "$ipv4addr" ]; then
		# Test for non-global IPv4 address 
		if ! testipv4_globalusable $ipv4addr; then
			echo $"Given IPv4 address $ipv4addr is not a globally usable one, 6to4 configuration is not valid!"
	                valid6to4config="no"
        	fi
		if [ -z "$IPV6TO4_RELAY" ]; then
			echo $"IPv6to4 configuration needs an IPv6to4 relay address, 6to4 configuration is not valid!"
			valid6to4config="no"
		fi
		if [ "$valid6to4config" = "yes" ]; then
			if ! testipv4_globalusable $IPV6TO4_RELAY; then
				echo $"Given IPv4 address of relay is not a globally usable one, 6to4 configuration is not valid!"
				valid6to4config="no"
			fi
		fi
	else
        	echo $"IPv6to4 configuration needs an IPv4 address on related interface or extra specified, 6to4 configuration is not valid!"
		valid6to4config="no"
	fi
        if [ "$valid6to4config" = "yes" ]; then
		ifup_ipv6to4 $DEVICE $ipv4addr
		if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
			grep "^sit0" /etc/sysconfig/static-routes-ipv6 | while read device args; do
				if [ "$device" = "sit0" ]; then
					ifup_ipv6_route $args ::$IPV6TO4_RELAY sit0
				fi
			done
		fi

	        if [ "$IPV6TO4_CONTROL_RADVD" = "yes" ]; then
			# RADVD is in use, so forwarding of IPv6 packets should be enabled
			if [ $ipv6_global_forwarding_current -ne 1 ]; then
				# Forwarding not set, display warning
				echo $"Using 6to4 and RADVD IPv6 forwarding usually should be enabled, but it isn't!"
			fi

			if [ -z "$IPV6TO4_RADVD_PIDFILE" ]; then
				# Take default
				IPV6TO4_RADVD_PIDFILE="/var/run/radvd/radvd.pid"
			fi

			# Send SIGHUP to radvd
			if [ -f "$IPV6TO4_RADVD_PIDFILE" ]; then
				pid="`cat $IPV6TO4_RADVD_PIDFILE`"
				if [ ! -z "$pid" ]; then
					echo $"Trigger RADVD for IPv6to4 prefix recalculation"	
					kill -HUP $pid
				else
					false
				fi
			fi
		        if [ ! -z "$IPV6TO4_ROUTING" ]; then
				# Generate 6to4 address
				ipv6to4prefix="`create6to4prefix $ipv4addr`"
				if [ ! -z "$ipv6to4prefix" ]; then
					# Add route to local networks
					for devsuf in $IPV6TO4_ROUTING; do
						dev="`echo $devsuf | awk -F- '{ print $1 }'`"
						suf="`echo $devsuf | awk -F- '{ print $2 }'`"
						ifup_ipv6_route ${ipv6to4prefix}$suf :: $dev
					done
				else
					echo $"Error occured while calculating the IPv6to4 prefix"
				fi
			else
				echo $"RADVD control enabled, but config is not complete!"
			fi
		fi
        fi
fi