#!/bin/sh
#
# ifup-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 2002-09-20
#
# $Id: ifup-ipv6,v 1.4 2003/01/13 20:26:29 warly Exp $
#
# Note: if called (like normally) by /etc/sysconfig/network-scripts/ifup
#        exit codes aren't handled by "ifup" 
#
# Uses following information from "/etc/sysconfig/network":
#  NETWORKING_IPV6=yes|no: controls IPv6 initialization (global setting)
#  IPV6_DEFAULTDEV=<device>: controls default route (optional)
#  IPV6_DEFAULTGW=<address>: controls default route (optional)
#
# Uses following information from "/etc/sysconfig/network-scripts/ifcfg-$1":
#  IPV6INIT=yes|no: controls IPv6 configuration for this interface
#  IPV6ADDR=<IPv6 address>[/<prefix length>]: specify primary static IPv6 address
#  IPV6ADDR_SECONDARIES="<IPv6 address>[/<prefix length>] ..." (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
#  IPV6_MTU=<MTU for IPv6>: controls IPv6 MTU for this link (optional)
#
# Optional for 6to4 tunneling (hardwired name of tunnel device is "tun6to4"):
#  IPV6TO4INIT=yes|no: controls 6to4 tunneling setup
#  IPV6TO4_RELAY=<IPv4 address>: IPv4 address of the remote 6to4 relay (default: 192.88.99.1)
#  IPV6TO4_IPV4ADDR=<IPv4 address>: overwrite local IPv4 address (optional)
#  IPV6TO4_ROUTING="<device>-<suffix>/<prefix length> ...": information to setup local subnetting
#    Example: IPV6TO4_ROUTING="eth0-:f101::0/64 eth1-:f102::0/64"
#  IPV6TO4_SECONDARY_SUFFICES="<suffix> ...": setup additional address using suffix
#    Example: IPV6TO4_SECONDARY_SUFFICES="2 0:0:0:3"
#
# Optional for 6to4 tunneling 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 
#


# 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

# Test whether IPv6 configuration is enabled for this interface, else stop
[ "$IPV6INIT" = "yes" ] || 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, module loaded, exit if system is not IPv6-ready
ipv6_test || exit 1

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

# Setup IPv6 address on specified interface
if ! [ -z "$IPV6ADDR" ]; then
	ipv6_add_addr_on_device $DEVICE $IPV6ADDR || exit 1
fi

# Get current global IPv6 forwarding
ipv6_global_forwarding_current="`ipv6_exec_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
		echo $"Global IPv6 forwarding is enabled in configuration, but not currently enabled in kernel"
		echo $"Please restart network with '/sbin/service network restart'"
	fi

	ipv6_local_forwarding=1
	ipv6_local_auto=0
	if [ "$IPV6_ROUTER" = "no" ]; then
		ipv6_local_forwarding=0
	fi
	if [ "$IPV6_AUTOCONF" = "yes" ]; then
		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
		echo $"Global IPv6 forwarding is disabled in configuration, but not currently disabled in kernel"
		echo $"Please restart network with '/sbin/service network restart'"
	fi

	ipv6_local_forwarding=0
	ipv6_local_auto=1
	if [ "$IPV6_AUTOCONF" = "no" ]; then
		ipv6_local_auto=0
	fi
fi
ipv6_exec_sysctl -n -w net.ipv6.conf.$DEVICE.forwarding=$ipv6_local_forwarding >/dev/null
ipv6_exec_sysctl -n -w net.ipv6.conf.$DEVICE.accept_ra=$ipv6_local_auto >/dev/null
ipv6_exec_sysctl -n -w net.ipv6.conf.$DEVICE.accept_redirects=$ipv6_local_auto >/dev/null

# Set IPv6 MTU, if given
if [ ! -z "$IPV6_MTU" ]; then
	ipv6_set_mtu $DEVICE $IPV6_MTU
fi

# Setup additional IPv6 addresses from list, if given
if [ ! -z "$IPV6ADDR_SECONDARIES" ]; then
	for ipv6addr in $IPV6ADDR_SECONDARIES; do
		ipv6_add_addr_on_device $DEVICE $ipv6addr
	done
fi

# Setup default IPv6 route, check are done by function
if [ ! -z "$IPV6_DEFAULTDEV" -o ! -z "$IPV6_DEFAULTGW" ]; then
	ipv6_set_default_route "$IPV6_DEFAULTGW" "$IPV6_DEFAULTDEV" "$DEVICE"
fi

# Setup additional static IPv6 routes on specified interface, if given
if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
	LC_ALL=C grep -w "^$DEVICE" /etc/sysconfig/static-routes-ipv6 | while read device args; do
		ipv6_add_route $args $DEVICE
	done
fi

# Setup of 6to4, if configured
if [ "$IPV6TO4INIT" = "yes" ]; then
	valid6to4config="yes"

	# Test device status of 6to4 tunnel
	ipv6_test_device_status tun6to4
	if [ $? = 0 ]; then
		# device is already up
		echo $"Device 'tun6to4' (from '$DEVICE') is already up, shutdown first"
		exit 1
	fi

	# Get IPv4 address for local 6to4 prefix calculation
	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="$IPADDR"
		fi
        fi
	if [ ! -z "$ipv4addr" ]; then
		if ! ipv6_test_ipv4_addr_global_usable $ipv4addr; then
			echo $"Given IPv4 address '$ipv4addr' is not globally usable"
	                valid6to4config="no"
        	fi
		if [ -z "$IPV6TO4_RELAY" ]; then
			IPV6TO4_RELAY="192.88.99.1"
		fi
	
		# Check/generate relay address
		ipv6to4_relay="`ipv6_create_6to4_relay_address $IPV6TO4_RELAY`"
		if [ $? -ne 0 ]; then
			valid6to4config="no"
		fi
	else
        	echo $"IPv6to4 configuration needs an IPv4 address on related interface or otherwise specified"
		valid6to4config="no"
	fi

	# Setup 6to4 tunnel (hardwired name is "tun6to4"), if config is valid
        if [ "$valid6to4config" = "yes" ]; then
		# Get MTU of master device
		ipv4mtu="`ipv6_exec_ip link show dev $DEVICE | grep -w "mtu" | awk '{ print $5 }'`"
		if [ ! -z "$ipv4mtu" ]; then
			# IPv6 tunnel MTU is IPv4 MTU minus 20 for IPv4 header
			tunnelmtu=$[ $ipv4mtu - 20 ]
		fi

		ipv6_add_6to4_tunnel tun6to4 $ipv4addr "" $tunnelmtu || exit 1

		# Add additional addresses
		if [ ! -z "$IPV6TO4_SECONDARY_SUFFICES" ]; then
			prefix6to4="`ipv6_create_6to4_prefix $ipv4addr`"
			for suffix in $IPV6TO4_SECONDARY_SUFFICES; do
				ipv6addr="$prefix6to4::$suffix/16"
				ipv6_add_addr_on_device tun6to4 $ipv6addr
			done
		fi

		# Add default route, if device matches
		if [ "$IPV6_DEFAULTDEV" = "tun6to4" ]; then
                        if [ ! -z "$IPV6_DEFAULTGW" ]; then
                                echo $"Warning: interface 'tun6to4' does not support 'IPV6_DEFAULTGW', ignored"
                        fi
			ipv6_set_default_route $ipv6to4_relay tun6to4
		fi

		# Add static routes
		if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
			LC_ALL=C grep -w "^tun6to4" /etc/sysconfig/static-routes-ipv6 | while read device network gateway; do
				if [ -z "$network" ]; then
					continue
				fi
				if [ -z "$gateway" ]; then
					gateway="$ipv6to4_relay"
				fi
				ipv6_add_route $network $ipv6to4_relay tun6to4
			done
		fi		

		# Cleanup autmatically generated autotunnel (not needed for 6to4)
		ipv6_del_route "::/96" "::" tun6to4
		ipv6_del_addr_on_device tun6to4 "::$ipv4addr/128"

	        if [ "$IPV6_CONTROL_RADVD" = "yes" ]; then
			# RADVD is in use, so forwarding of IPv6 packets should be enabled, display warning
			if [ $ipv6_global_forwarding_current -ne 1 ]; then
				echo $"Using 6to4 and RADVD IPv6 forwarding usually should be enabled, but it isn't"
			fi

		        if [ ! -z "$IPV6TO4_ROUTING" ]; then
				ipv6to4prefix="`ipv6_create_6to4_prefix $ipv4addr`"
				if [ ! -z "$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 }'`"
						ipv6_add_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

			# Control running radvd
			ipv6_trigger_radvd up "$IPV6_RADVD_TRIGGER_ACTION" $IPV6_RADVD_PIDFILE
		fi
	else
		echo $"6to4 configuration is not valid"
		exit 1
        fi
fi