#!/bin/sh
#
# network-functions-ipv6
#
# Taken from:
# (P) & (C) 1997-2000 Peter Bieringer <pb@bieringer.de>

# DEBUG_IPV6 & 1 "set -x" mode
# DEBUG_IPV6 & 2 prevents from executing any network configuration
# DEBUG_IPV6 & 4 shows messages in the test section

#DEBUG_IPV6=$[ 65535 - 1 -2  -4]
DEBUG_IPV6=0

# Return values
#  0 = ok
#  1 = error occurs
#  2 = not enabled, i.e. no IPv6 kernel support or switched off by configuration

##### Test for IPv6 capabilites

function test_ipv6()
{
    if [ -z $DEBUG_IPV6 ] ; then DEBUG_IPV6=0; fi

    if ! [ $[ $DEBUG_IPV6 & 4 ] = 0 ] ; then
        echo " Tests for IPv6"    
    fi

    # Test for IPv6 kernel
    if ! [ $[ $DEBUG_IPV6 & 4 ] = 0 ] ; then
        echo -n "  Test kernel for IPv6..."
    fi

    if ! [ -f /proc/net/if_inet6 ]; then
        echo "Do not found IPv6 in kernel, try to load module"
	modprobe ipv6
	
        if ! [ -f /proc/net/if_inet6 ]; then
	    if ! [ $[ $DEBUG_IPV6 & 4 ] = 0 ] ; then
    	        echo "Not compiled for IPv6 - stop!"
    	    else
        	echo "Kernel not compiled for IPv6 - stop!"
    	    fi
    	    return 2
	fi
    else
        if ! [ $[ $DEBUG_IPV6 & 4 ] = 0 ] ; then
            echo " Ok!"
        fi
    fi

    # Test for IPv6 enabled needed binaries
    if ! [ $[ $DEBUG_IPV6 & 4 ] = 0 ] ; then
        echo n "  Test binaries for IPv6 capability..."
    fi

    if ! ifconfig -? 2>&1 | grep -q "(IPv6)"; then
    	echo "'`which ifconfig`' (net-tools) not compiled for IPv6 - stop!"
        return 2
    fi
	
    if ! route -? 2>&1 | grep -q "(IPv6)"; then
    	echo "'`which route`' (net-tools) not compiled for IPv6 - stop!"
	return 2
    fi

    if ! [ $[ $DEBUG_IPV6 & 4 ] = 0 ] ; then
        echo  "  Ok!"
    fi

    # Info about executing
    if [ $[ $DEBUG_IPV6 > 0 ] = 1 ]; then
        echo  "  Executing in DEBUG_IPV6 mode: $DEBUG_IPV6"
    fi
}

##### Static route configuration

# Display usage
function ifup_ipv6_route_usage() {
	echo $"Usage: $0 IPv6-network IPv6-gateway [device]"
}

# set route
function ifup_ipv6_route() {
	networkipv6=$1
	gatewayipv6=$2
	device=$3		# maybe empty

	if [ -z $networkipv6 ]; then
		echo $"Missing option IPv6-network'"
		ifup_ipv6_route_usage
		return 1
	fi

	if [ -z $gatewayipv6 ]; then
		echo $"Missing option 'IPv6-gateway'"
		ifup_ipv6_route_usage
		return 1
	fi

        # Run IPv6 test
	test_ipv6 || return    

	[ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set -x
	
	if [ -z $device ]; then
                route -A inet6 add $networkipv6 gw $gatewayipv6
	else
                route -A inet6 add $networkipv6 gw $gatewayipv6 dev $device
	fi

	[ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set +x
}

# delete route
function ifdown_ipv6_route() {
	networkipv6=$1
	gatewayipv6=$2
	device=$3		# maybe empty

	if [ -z $networkipv6 ]; then
		echo $"Missing option IPv6-network'"
		ifup_ipv6_route_usage
		return 1
	fi

	if [ -z $gatewayipv6 ]; then
		echo $"Missing option 'IPv6-gateway'"
		ifup_ipv6_route_usage
		return 1
	fi

        # Run IPv6 test
	test_ipv6 || return    

	[ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set -x
	
	if [ -z $device ]; then
                route -A inet6 del $networkipv6 gw $gatewayipv6
	else
                route -A inet6 del $networkipv6 gw $gatewayipv6 dev $device
	fi

	[ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set +x
}


##### tunnel configuration

# Display usage
function ifup_ipv6_tunnel_usage() {
	echo $"Usage: $0 interfacename IPv4-tunneladdress IPv6-route"
}

## Configure tunnels up
function ifup_ipv6_tunnel() {
	device=$1
	addressipv4tunnel=$2
	routeipv6=$3

	if [ -z $device ]; then
		echo $"Missing option 'device'"
		ifup_ipv6_tunnel_usage
		return 1
	fi

	if [ -z $addressipv4tunnel ]; then
		echo $"Missing option 'IPv4-tunneladdress'"
		ifup_ipv6_tunnel_usage
		return 1
	fi

	if [ -z $routeipv6 ]; then
		echo $"Missing option 'IPv6-route'"
		ifup_ipv6_tunnel_usage
		return 1
	fi
	
        # Run IPv6 test
	test_ipv6 || return    

        [ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set -x

        # enable IPv6-over-IPv4 tunnels
	if ifconfig sit0 | grep -q "UP "; then
		# already up, do nothing
		true
	else
		# basic tunnel device to up
	        if [ $[ $DEBUG_IPV6 & 2 ] = 0 ] ; then
    			ifconfig sit0 up
		fi
        fi

        if [ $[ $DEBUG_IPV6 & 2 ] = 0 ]; then
                # Set up a tunnel
		route -A inet6 add $routeipv6 gw ::$addressipv4tunnel dev sit0
        fi

        [ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set +x
}	

## Configure tunnels down

function ifdown_ipv6_tunnel() {
	device=$1
	addressipv4tunnel=$2
	routeipv6=$3

	if [ -z $device ]; then
		echo $"Missing option 'device'"
		ifup_ipv6_tunnel_usage
		return 1
	fi

	if [ -z $addressipv4tunnel ]; then
		echo $"Missing option 'IPv4-tunneladdress'"
		ifup_ipv6_tunnel_usage
		return 1
	fi

	if [ -z $routeipv6 ]; then
		echo $"Missing option 'IPv6-route'"
		ifup_ipv6_tunnel_usage
		return 1
	fi

        # Run IPv6 test
	test_ipv6 || return    

        [ $[ $DEBUG_IPV6 & 1 ] = 0 ] ||	set -x

        if [ $[ $DEBUG_IPV6 & 2 ] = 0 ]; then
                # Set up a tunnel
		route -A inet6 del $routeipv6 gw ::$addressipv4tunnel dev sit0
        fi

        # disable IPv6-over-IPv4 tunnels (if no longer a tunnel is up)
	if route -A inet6 -n | grep sit0 | grep -v -q "^::"; then
		# existing routes, do nothing
		true
	else
		# basic tunnel device to down
	        if [ $[ $DEBUG_IPV6 & 2 ] = 0 ] ; then
    			ifconfig sit0 down
		fi
        fi

        [ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set +x
}	

	
##### Interface configuration

# Display usage
function ifup_ipv6_usage() {
	echo $"Usage: $0 interfacename IPv6-address IPv6-prefixlength"
}

## Configure interfaces up
function ifup_ipv6_real() {
	device=$1
	address=$2
	prefixlength=$3

	if [ -z $device ]; then
		echo $"Missing option 'device'"
		ifup_ipv6_usage
		return 1
	fi

	if [ -z $address ]; then
		echo $"Missing option 'IPv6-address'"
		ifup_ipv6_usage
		return 1
	fi

	if [ -z $prefixlength ]; then
		echo $"Missing option 'Prefixlength'"
		ifup_ipv6_usage
		return 1
	fi

    	# Run IPv6 test
	test_ipv6 || return    

	[ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set -x

        if [ $[ $DEBUG_IPV6 & 2 ] = 0 ]; then
              ifconfig $device add $address/$length || return 2
	fi
    
        if [ $[ $DEBUG_IPV6 & 2 ] = 0 ]; then
              route -A inet6 add $address/$prefixlength dev $device || return 2
	fi

        [ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set +x
}


## Configure interfaces down
function ifdown_ipv6_real() {
	device=$1
	address=$2
	prefixlength=$3

	if [ -z $device ]; then
		echo $"Missing option 'device'"
		ifup_ipv6_usage
		return 1
	fi

	if [ -z $address ]; then
		echo $"Missing option 'IPv6-address'"
		ifup_ipv6_usage
		return 1
	fi

	if [ -z $prefixlength ]; then
		echo $"Missing option 'Prefixlength'"
		ifup_ipv6_usage
		return 1
	fi

    	# Run IPv6 test
	test_ipv6 || return    

    	[ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set -x


        if [ $[ $DEBUG_IPV6 & 2 ] = 0 ]; then
              route -A inet6 del $address/$prefixlength dev $device || return 2
	fi
        if [ $[ $DEBUG_IPV6 & 2 ] = 0 ]; then
              ifconfig $device del $address/$length || return 2
	fi
    
    	[ $[ $DEBUG_IPV6 & 1 ] = 0 ] || set +x
}