Subversion Repositories configs

# network-functions-ipv6

#

# Taken from: network-functions-ipv6

# (P) & (C) 1997-2005 by Peter Bieringer <pb@bieringer.de>

#

#  You will find more information on the initscripts-ipv6 homepage at

#   http://www.deepspace6.net/projects/initscripts-ipv6.html

#

# Version: 2006-08-03

#

#

##### Logging function

#  $1: <message> : message string

#  $2: [stdout|stderr].[err|warn[ing]|inf[o]|notice] : log level with optional channel, default is "stdout.notice"

#      [syslog.[facility.].err|warn[ing]|inf[o]|notice : syslog channel, default is "syslog.user.notice"

#  $3: <function name> : name of function which calls this log function, can be empty using ""

# return code: 0=ok 1=argument error  3=major problem

ipv6_log() {

	local message="$1"

	local level="$2"

	local name="$3"

	if [ -z "$message" ]; then

		echo $"ERROR: [ipv6_log] Missing 'message' (arg 1)" >/dev/stderr

		return 1

	fi

	if [ -z "$level" ]; then

		local level="stdout.notice"

	fi

	# Map loglevel now

	local fn=1

	local fnawk="print \$$fn"

	local t="$(echo $level | awk -F. "{ $fnawk }")"

	# Check channel, if given

	case $t in

	    'stdout'|'stderr'|'syslog')

		local channel="$t"

		local fn=$(($fn + 1))

		;;

	    *)

		local channel="stdout"

		;;

	esac

	# Check syslog facilty, if given

	if [ "$channel" = "syslog" ]; then

		local fnawk="print \$$fn"

		local t="$(echo $level | awk -F. "{ $fnawk }")"

		case $t in

		    'local0'|'local1'|'local2'|'local3'|'local4'|'local5'|'local6'|'local7'|'daemon')

			local facility="$t"

			local fn=$(($fn + 1))

			;;

		    *)

			local facility="user"

			;;

		esac

	fi

	local fnawk="print \$$fn"

	local t="$(echo $level | awk -F. "{ $fnawk }")"

	# Map priority

	[ "$t" = "inf"      ] && local t="info"

	[ "$t" = "deb"      ] && local t="debug"

	[ "$t" = "warning"  ] && local t="warn"

	[ "$t" = "error"    ] && local t="err"

	[ "$t" = "critical" ] && local t="crit"

	# Check priority, if given

	case $t in

	    'info'|'debug'|'notice'|'warn'|'err'|'crit')

			local priority="$t"

			local fn=$(($fn + 1))

			;;

		    *)

			local priority="notice"

			;;

	esac

	local fnawk="print \$$fn"

	local t="$(echo $level | awk -F. "{ $fnawk }")"

	if [ -n "$t" ]; then

		echo $"ERROR: [ipv6_log] Loglevel isn't valid '$level' (arg 2)" >/dev/stderr

		return 1

	fi

	# Generate function text

	if [ -z "$name" ]; then

		local txt_name=""

	else

		local txt_name="[$name]"

	fi

	# Log message

	case $channel in

	    'stdout'|'stderr')

		# Generate level text

		case $priority in

		    'debug')

			local txt_level=$"DEBUG    "

			;;

		    'err')

			local txt_level=$"ERROR    "

			;;

		    'warn')

			local txt_level=$"WARN     "

			;;

		    'crit')

			local txt_level=$"CRITICAL "

			;;

		    'info')

			local txt_level=$"INFO     "

			;;

		    'notice')

			local txt_level=$"NOTICE   "

			;;

		esac

		[ -n "$txt_name" ] && local txt_name="$txt_name "

		if [ "$channel" = "stderr" ]; then

			echo "$txt_level: ${txt_name}${message}" >/dev/stderr

		elif [ "$channel" = "stdout" ]; then

			echo "$txt_level: ${txt_name}${message}"

		fi

		;;

	    'syslog')

		# note: logger resides in /usr/bin, but not used by default

		if ! [ -x /usr/bin/logger ]; then

			echo $"ERROR: [ipv6_log] Syslog is chosen, but binary 'logger' doesn't exist or isn't executable" >/dev/stderr

			return 3

		fi

		if [ -z "$txt_name" ]; then

			/usr/bin/logger -p $facility.$priority $message

		else

			/usr/bin/logger -p $facility.$priority -t "$txt_name" "$message"

		fi

		;;

	    *)

		echo $"ERROR: [ipv6_log] Cannot log to channel '$channel'" >/dev/stderr

		return 3

		;;

	esac

	return 0

}

###### Beginning of main code here, always executed on "source|. network-functions-ipv6"

###### End of main code here

##### Test for IPv6 capabilites

# $1: (optional) testflag: currently supported: "testonly" (do not load a module)

# return code: 0=ok 2=IPv6 test fails

ipv6_test() {

	local fn="ipv6_test"

	local testflag=$1

	if ! [ -f /proc/net/if_inet6 ]; then

		if [ "$testflag" = "testonly" ]; then

			return 2

		else

			modprobe ipv6

			if ! [ -f /proc/net/if_inet6 ]; then

				#	ipv6_log $"Kernel is not compiled with IPv6 support" crit $fn

				return 2

			fi

		fi

	fi

	if ! [ -d /proc/sys/net/ipv6/conf/ ]; then

		return 2

	fi

	return 0

}

##### Static IPv6 route configuration

# Set static IPv6 route

#  $1: <IPv6 network> : to route

#  $2: <IPv6 gateway> : over which $1 should be routed (if "::", gw will be skipped)

#  $3: [<Interface>] : (optional)

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem adding route

ipv6_add_route() {

	local fn="ipv6_add_route"

	local networkipv6=$1

	local gatewayipv6=$2

	local device=$3		# maybe empty

	if [ -z "$networkipv6" ]; then

		ipv6_log $"Missing parameter 'IPv6-network' (arg 1)" err $fn

		return 1

	fi

	if [ -z "$gatewayipv6" ]; then

		ipv6_log $"Missing parameter 'IPv6-gateway' (arg 2)" err $fn

		return 1

	fi

	ipv6_test || return 2

	ipv6_test_ipv6_addr_valid $networkipv6 || return 2

	ipv6_test_ipv6_addr_valid $gatewayipv6 || return 2

	if [ -z "$device" ]; then

		local returntxt="$(/sbin/ip -6 route add $networkipv6 via $gatewayipv6 metric 1 2>&1)"

	else

		if [ "$gatewayipv6" = "::" ]; then

			local returntxt="$(/sbin/ip -6 route add $networkipv6 dev $device metric 1 2>&1)"

		else

			local returntxt="$(/sbin/ip -6 route add $networkipv6 via $gatewayipv6 dev $device metric 1 2>&1)"

		fi

	fi

	if [ -n "$returntxt" ]; then

		if echo $returntxt | LC_ALL=C grep -q "File exists"; then

			# Netlink: "File exists"

			true

		elif echo $returntxt | LC_ALL=C grep -q "No route to host"; then

			# Netlink: "No route to host"

			ipv6_log $"'No route to host' adding route '$networkipv6' via gateway '$gatewayipv6' through device '$device'" warn $fn

			return 3

		else

			ipv6_log $"Unknown error" warn $fn

			return 3

		fi

	fi

	return 0

}

##### automatic tunneling configuration

## Configure automatic tunneling up

# return code: 0=ok 2=IPv6 test fails 3=major problem

ipv6_enable_autotunnel() {

	local fn="ipv6_enable_autotunnel"

	ipv6_test || return 2

	# enable IPv6-over-IPv4 tunnels

	if ipv6_test_device_status sit0; then

		true

	else

		# bring up basic tunnel device

		/sbin/ip link set sit0 up

			if ! ipv6_test_device_status sit0; then

				ipv6_log $"Tunnel device 'sit0' enabling didn't work" err $fn

				return 3

			fi

		# Set sysctls proper (regardless "default")

		/sbin/sysctl -e -w net.ipv6.conf.sit0.forwarding=1 >/dev/null 2>&1

		/sbin/sysctl -e -w net.ipv6.conf.sit0.accept_ra=0 >/dev/null 2>&1

		/sbin/sysctl -e -w net.ipv6.conf.sit0.accept_redirects=0 >/dev/null 2>&1

	fi

	return 0

}

##### Interface configuration

## Add an IPv6 address for given interface

#  $1: <Interface>

#  $2: <IPv6 address[/prefix]>

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_add_addr_on_device() {

	local fn="ipv6_add_addr_on_device"

	local device=$1

	local address=$2

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	if [ -z "$address" ]; then

		ipv6_log $"Missing parameter 'IPv6-address' (arg 2)" err $fn

		return 1

	fi

	ipv6_test || return 2

	ipv6_test_ipv6_addr_valid $address || return 1

	ipv6_test_device_status $device

	local result=$?

	if [ "$result" = "0" ]; then

		true

	elif [ "$result" != "11" ]; then

		ipv6_log $"Device '$device' doesn't exist" err $fn

		return 3

	else

		/sbin/ip link set $device up

			if ! ipv6_test_device_status $device; then

				ipv6_log $"Device '$device' enabling didn't work" err $fn

				return 3

			fi

	fi

	# Extract address parts

	local prefixlength_implicit="$(echo $address | awk -F/ '{ print $2 }')"

	local address_implicit="$(echo $address | awk -F/ '{ print $1 }')"

	# Check prefix length and using '64' as default

	if [ -z "$prefixlength_implicit" ]; then

		local prefixlength_implicit="64"

		local address="$address_implicit/$prefixlength_implicit"

	fi

	/sbin/ip -6 addr replace $address dev $device

	local result=$?

	if [ $result -eq 2 ]; then

		return 0

	elif [ $result -ne 0 ]; then

		ipv6_log $"Cannot add IPv6 address '$address' on dev '$device'" err $fn

		return 3

	fi

	return 0

}

## Remove all IPv6 routes and addresses on given interface (cleanup to prevent kernel crashes)

#  $1: <Interface>

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_cleanup_device() {

	local fn="ipv6_cleanup_device"

	local device=$1

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	ipv6_test testonly || return 2

	# Remove all IPv6 routes through this device (but not "lo")

	if [ "$device" != "lo" ]; then

		/sbin/ip -6 route flush dev $device scope global >/dev/null 2>&1

		/sbin/ip -6 route flush dev $device scope site   >/dev/null 2>&1

	fi

	# Remove all IPv6 addresses on this interface

	/sbin/ip -6 addr flush dev $device scope global >/dev/null 2>&1

	/sbin/ip -6 addr flush dev $device scope site   >/dev/null 2>&1

	return 0

}

## Remove all IPv6 6to4 related routes and addresses on given interface

#  $1: <Interface>

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_cleanup_6to4_device() {

	local fn="ipv6_cleanup_6to4_device"

	local device=$1

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	ipv6_test testonly || return 2

	# Cleanup 6to4 addresses on this device

	/sbin/ip -6 addr show dev $dev scope global permanent | LC_ALL=C grep -w inet6 | awk '{ print $2}' | LC_ALL=C grep "^2002:" | while read addr; do

		/sbin/ip -6 addr del ${addr} dev ${dev}

	done

	# Get all IPv6 routes through given interface related to 6to4 and remove them

	/sbin/ip -6 route show dev $device | LC_ALL=C grep "^2002:" | while read ipv6net dummy; do

		/sbin/ip -6 route del $ipv6net dev $device

	done

	return 0

}

##### Some address test functions

## Test a given IPv6 address for validity

#  $1: <IPv6 address>

# return code: 0=ok 1=not valid

ipv6_test_ipv6_addr_valid() {

	ipcalc -cs6 $1

}

## Test a given IPv4 address for validity

#  $1: <IPv4 address>

# return code: 0=ok 1=not valid

ipv6_test_ipv4_addr_valid() {

	ipcalc -cs4 $1

}

## Test a given IPv4 address for not a private but unicast one

#  $1: <IPv4 address>

# return code: 0=ok 1=argument error 10=private or not unicast

ipv6_test_ipv4_addr_global_usable() {

	local fn="ipv6_test_ipv4_addr_global_usable"

	local testipv4addr_globalusable=$1

	if [ -z "$testipv4addr_globalusable" ]; then

		return 1

	fi

	# Test for a globally usable IPv4 address now

		# test 0.0.0.0/8

		/bin/ipcalc --network $testipv4addr_globalusable 255.0.0.0   | LC_ALL=C grep -q "NETWORK=0\.0\.0\.0"     && return 10

		# test 10.0.0.0/8     (RFC 1918 / private)

		/bin/ipcalc --network $testipv4addr_globalusable 255.0.0.0   | LC_ALL=C grep -q "NETWORK=10\.0\.0\.0"    && return 10

		# test 127.0.0.0/8    (loopback)

		/bin/ipcalc --network $testipv4addr_globalusable 255.0.0.0   | LC_ALL=C grep -q "NETWORK=127\.0\.0\.0"   && return 10

		# test 169.254.0.0/16 (APIPA / DHCP link local)

		/bin/ipcalc --network $testipv4addr_globalusable 255.255.0.0 | LC_ALL=C grep -q "NETWORK=169\.254\.0\.0" && return 10

		# test 172.16.0.0/12  (RFC 1918 / private)

		/bin/ipcalc --network $testipv4addr_globalusable 255.240.0.0 | LC_ALL=C grep -q "NETWORK=172\.16\.0\.0"  && return 10

		# test 192.168.0.0/16 (RFC 1918 / private)

		/bin/ipcalc --network $testipv4addr_globalusable 255.255.0.0 | LC_ALL=C grep -q "NETWORK=192\.168\.0\.0" && return 10

		# test 224.0.0.0/3    (multicast and reserved, broadcast)

		/bin/ipcalc --network $testipv4addr_globalusable 224.0.0.0   | LC_ALL=C grep -q "NETWORK=224\.0\.0\.0"   && return 10

	return 0

}

## Test a given device for status

#  $1: <Interface>

# return code: 0=ok 1=argument error 10=not exists 11=down

ipv6_test_device_status() {

	local fn="ipv6_test_device_status"

	local device=$1

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	# Test if device exists

	if [ ! -d "/sys/class/net/${device}" ]; then

		# not exists

		return 10

	fi

	# Test if device is up

	if /sbin/ip link show dev $device 2>/dev/null | LC_ALL=C grep -q "UP"; then

		# up

		return 0

	else

		# down

		return 11

	fi

}

## Create 6to4 prefix

#  $1: <IPv4 address>

# stdout: <6to4address>

# return code: 0=ok 1=argument error

ipv6_create_6to4_prefix() {

	local fn="ipv6_create_6to4_prefix"

	local ipv4addr=$1

	if [ -z "$ipv4addr" ]; then

		ipv6_log $"Missing parameter 'IPv4 address' (arg 1)" stderr.err $fn

	fi

	local major1="$(echo $ipv4addr | awk -F. '{ print $1 }')"

	local minor1="$(echo $ipv4addr | awk -F. '{ print $2 }')"

	local major2="$(echo $ipv4addr | awk -F. '{ print $3 }')"

	local minor2="$(echo $ipv4addr | awk -F. '{ print $4 }')"

	if [ -z "$major1" -o -z "$minor1" -o -z "$major2" -o -z "$minor2" ]; then

		return 1

	fi

	if [ $major1 -eq 0 ]; then

		local block1="$(printf "%x" $minor1)"

	else

		local block1="$(printf "%x%02x" $major1 $minor1)"

	fi

	if [ $major2 -eq 0 ]; then

		local block2="$(printf "%x" $minor2)"

	else

		local block2="$(printf "%x%02x" $major2 $minor2)"

	fi

	local prefix6to4="2002:$block1:$block2"

	echo "$prefix6to4"

	return 0

}

## Check and create 6to4 tunnel relay address

#  $1: <IPv4 address|IPv6to4 address>

# stdout: <tunnel relay address>

# return code: 0=ok 1=argument error

ipv6_create_6to4_relay_address() {

	local fn="ipv6_create_6to4_relay_address"

	local addr=$1

	if [ -z "$addr" ]; then

		ipv6_log $"Missing parameter 'address' (arg 1)" stderr.err $fn

		return 1

	fi

	# Check

	if ipv6_test_ipv4_addr_valid $addr ; then

		# ok, a IPv4 one

		if ipv6_test_ipv4_addr_global_usable $addr; then

			# IPv4 globally usable

			local ipv6to4_relay="::$addr"

		else

			ipv6_log $"Given address '$addr' is not a global IPv4 one (arg 1)" stderr.err $fn

			return 1

		fi

	else

		ipv6_log $"Given address '$addr' is not a valid IPv4 one (arg 1)" stderr.err $fn

		return 1

	fi

	echo "$ipv6to4_relay"

	return 0

}

##### 6to4 tunneling setup

## Configure 6to4 tunneling up

#  $1: <Interface> : only "tun6to4" is supported

#  $2: <IPv4 address> : global IPv4 address of interface (will be used to generate 6to4 prefix)

#  $3: [<IPv6 suffix>] : for 6to4 prefix (optional, default is "::1")

#  $4: [<MTU>] : MTU of tunnel device (optional, default is automatic)

#  $5: [<IPv4 address>] : local IPv4 address of tunnel interface (required in case of 6to4 behind NAT)

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_add_6to4_tunnel() {

	local fn="ipv6_add_6to4_tunnel"

	local device=$1

	local globalipv4=$2

	local globalipv6to4suffix=$3

	local mtu=$4

	local localipv4=$5

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	if [ -z "$globalipv4" ]; then

		ipv6_log $"Missing parameter 'global IPv4 address' (arg 2)" err $fn

		return 1

	fi

	# Check device

	if [ "$device" != "tun6to4" ]; then

		ipv6_log $"Given device '$device' is not supported (arg 1)" err $fn

		return 1

	fi

	# Copy global IPv4 address to local if last one is not given

	if [ -z "$localipv4" ]; then

		localipv4="$globalipv4"

	fi

	ipv6_test || return 2

	# Generate 6to4 address

	local prefix6to4="$(ipv6_create_6to4_prefix $globalipv4)"

	if [ $? -ne 0 -o -z "$prefix6to4" ]; then

		return 3

	fi

	if [ -z "$globalipv6to4suffix" ]; then

		local address6to4="${prefix6to4}::1/16"

	else

		local address6to4="${prefix6to4}::${globalipv6to4suffix}/16"

	fi

		ipv6_add_tunnel_device tun6to4 0.0.0.0 $address6to4 $localipv4

		if [ $? -ne 0 ]; then

			local retval=3

		else

			local retval=0

		fi

		# Add unspecific unreachable route for local 6to4 address space

		/sbin/ip route add unreach ${prefix6to4}::/48

	# Set MTU, if given

	if [ -n "$mtu" ]; then

		ipv6_set_mtu $device $mtu

	fi

	return $retval

}

## Configure all 6to4 tunneling down

#  $1: <Interface> : only "tun6to4" is supported

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_cleanup_6to4_tunnels() {

	local fn="ipv6_cleanup_6to4_tunnels"

	local device=$1

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	# Check device

	if [ "$device" != "tun6to4" ]; then

		ipv6_log $"Given device '$device' is not supported (arg 1)" err $fn

		return 1

	fi

	ipv6_test testonly || return 2

		ipv6_del_tunnel_device tun6to4

		# Remove all unspecific unreachable routes for local 6to4 address space

		/sbin/ip -6 route | LC_ALL=C grep "^unreachable 2002:" | LC_ALL=C grep "/48 dev lo" | while read token net rest; do

			/sbin/ip route del unreach $net

		done

	return 0

}

## Configure 6to4 tunneling down

#  $1: <Interface> : only "tun6to4" is supported

#  $2: <IPv4 address> : global address of local interface

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_del_6to4_tunnel() {

	local fn="ipv6_del_6to4_tunnel"

	local device=$1

	local localipv4=$2

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	if [ -z "$localipv4" ]; then

		ipv6_log $"Missing parameter 'local IPv4 address' (arg 2)" err $fn

		return 1

	fi

	# Check device

	if [ "$device" != "tun6to4" ]; then

		ipv6_log $"Given device '$device' is not supported (arg 1)" err $fn

		return 1

	fi

	ipv6_test || return 2

		ipv6_del_tunnel_device tun6to4

		local retval=$?

		# Remove unspecific unreachable route for local 6to4 address space

		/sbin/ip route del unreach ${prefix6to4}::/48

	return $retval

}

## Configure a static tunnel device up

#  $1: <Interface>

#  $2: <IPv4 address> : of foreign tunnel

#  $3: [<IPv6 address>] : local one of a P-t-P tunnel (optional)

#  $4: [<IPv4 address>] : local one of tunnel (optional)

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_add_tunnel_device() {

	local fn="ipv6_add_tunnel_device"

	local device=$1

	local addressipv4tunnel=$2

	local addressipv6local=$3

	local addressipv4tunnellocal=$4

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	if [ -z "$addressipv4tunnel" ]; then

		ipv6_log $"Missing parameter 'IPv4-tunnel address' (arg 2)" err $fn

		return 1

	fi

	if [ -z "$addressipv4tunnellocal" ]; then

		local addressipv4tunnellocal="any"

	fi

	ipv6_test || return 2

	if ! ipv6_test_device_status $device; then

		local ttldefault="$(/sbin/sysctl -e net.ipv4.ip_default_ttl | awk '{ print $3 }')"

		if [ -z "$ttldefault" ]; then

			local ttldefault=64

		fi

		# Test whether remote IPv4 address was already applied to another tunnel

		if [ "$addressipv4tunnel" != "0.0.0.0" -a "$addressipv4tunnel" != "any" ]; then

			/sbin/ip tunnel show remote $addressipv4tunnel 2>/dev/null | LC_ALL=C grep -w "ipv6/ip" | while IFS=":" read devnew rest; do

				if [ "$devnew" != "$device" ]; then

					ipv6_log $"Given remote address '$addressipv4tunnel' on tunnel device '$device' is already configured on device '$devnew'" err $fn

					return 3

				fi

			done

		fi

		/sbin/ip tunnel add $device mode sit ttl $ttldefault remote $addressipv4tunnel local $addressipv4tunnellocal

		if [ $? -ne 0 ]; then

			return 3

		fi

		# Test, whether "ip tunnel show" reports valid content

		if ! /sbin/ip tunnel show $device 2>/dev/null | LC_ALL=C grep -q -w "remote"; then

			ipv6_log $"Tunnel device '$device' creation didn't work" err $fn

			return 3

		fi

		/sbin/ip link set $device up

		if ! ipv6_test_device_status $device; then

			ipv6_log $"Tunnel device '$device' bringing up didn't work" err $fn

			return 3

		fi

		# Set sysctls proper (regardless "default")

		/sbin/sysctl -e -w net.ipv6.conf.$SYSCTLDEVICE.forwarding=1 >/dev/null 2>&1

		/sbin/sysctl -e -w net.ipv6.conf.$SYSCTLDEVICE.accept_ra=0 >/dev/null 2>&1

		/sbin/sysctl -e -w net.ipv6.conf.$SYSCTLDEVICE.accept_redirects=0 >/dev/null 2>&1

		if [ -n "$addressipv6local" ]; then

			# Setup P-t-P address

			ipv6_add_addr_on_device $device $addressipv6local

			if [ $? -ne 0 ]; then

				return 3

			fi

		fi

	else

		false

	fi

	return 0

}

## Configure a static tunnel device down

#  $1: <Interface>

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_del_tunnel_device() {

	local fn="ipv6_del_tunnel_device"

	local device=$1

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	ipv6_test testonly || return 2

	if ipv6_test_device_status $device; then

		ipv6_cleanup_device $device

	else

		if [ "$device" != "sit0" ]; then

			false

		fi

	fi

	if [ "$device" != "sit0" ]; then

		if /sbin/ip tunnel show $device 2>/dev/null | LC_ALL=C grep -q -w "ipv6/ip"; then

			/sbin/ip tunnel del $device

				if ipv6_test_device_status $device; then

					return 3

				fi

		else

			false

		fi

	fi

	return 0

}

## Cleanup all dedicated tunnel devices

ipv6_cleanup_tunnel_devices() {

	local fn="ipv6_cleanup_tunnel_devices"

	ipv6_test testonly || return 2

	# Find still existing tunnel devices and shutdown and delete them

	/sbin/ip tunnel show | LC_ALL=C grep -w "ipv6/ip" | awk -F: '{ print $1 }' | while read device; do

		ipv6_del_tunnel_device $device

	done

	return 0

}

## Get address of a dedicated tunnel

#  $1: <Interface>

#  $2: local|remote : local or remote address

# stdout: <IPv4 address> if available

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_get_ipv4addr_of_tunnel() {

	local fn="ipv6_get_local_ipv4_of_tunnel"

	local device=$1

	local selection=$2

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" stderr.err $fn

		return 1

	fi

	if [ -z "$selection" ]; then

		ipv6_log $"Missing parameter 'selection' (arg 2)" stderr.err $fn

		return 1

	fi

	if [ "$selection" != "local" -a "$selection" != "remote" ]; then

		ipv6_log $"Unsupported selection '$selection' specified (arg 2)" stderr.err $fn

		return 1

	fi

	ipv6_test testonly || return 2

	ipv6_test_device_status $device

	if [ $? != 0 -a $? != 11 ]; then

		# Device doesn't exist

		return 3

	fi

	# Device exists, retrieve address

	if [ "$selection" = "local" ]; then

		local tunnel_local_ipv4addr="$(/sbin/ip tunnel show $device | awk '{ print $6 }')"

	elif [ "$selection" = "remote" ]; then

		local tunnel_local_ipv4addr="$(/sbin/ip tunnel show $device | awk '{ print $4 }')"

	fi

	if [ $? != 0 ]; then

		return 3

	fi

	if [ "$tunnel_local_ipv4addr" = "any" ]; then

		local tunnel_local_ipv4addr="0.0.0.0"

	fi

	echo "$tunnel_local_ipv4addr"

	return 0

}

## Get IPv4 address of a device

#  $1: <Interface>

# stdout: <IPv4 address> if available

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem (more than one IPv4 address applied)

ipv6_get_ipv4addr_of_device() {

	local fn="ipv6_get_ipv4addr_of_device"

	local device=$1

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" stderr.err $fn

		return 1

	fi

	ipv6_test_device_status $device

	if [ $? != 0 -a $? != 11 ]; then

		# Device doesn't exist

		return 3

	fi

	# Device exists, retrieve the first address only

	local ipv4addr="$(/sbin/ip -o -4 addr show dev $device | awk '{ print $4 }' | awk -F/ '{ print $1; exit }')"

	if [ $? != 0 ]; then

		return 3

	fi

	if [ "$ipv4addr" = "any" ]; then

		local ipv4addr="0.0.0.0"

	fi

	echo "$ipv4addr"

	return 0

}

## Set IPv6 MTU for a device

#  $1: <Interface>

#  $2: <IPv6 MTU>

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_set_mtu() {

	local fn="ipv6_set_mtu"

	local device=$1

	local ipv6_mtu=$2

	if [ -z "$device" ]; then

		ipv6_log $"Missing parameter 'device' (arg 1)" err $fn

		return 1

	fi

	if [ -z "$ipv6_mtu" ]; then

		ipv6_log $"Missing parameter 'IPv6 MTU' (arg 2)" err $fn

		return 1

	fi

	# Check range

	if [ $ipv6_mtu -lt 1280 -o $ipv6_mtu -gt 65535 ]; then

		ipv6_log $"Given IPv6 MTU '$ipv6_mtu' is out of range" err $fn

		return 1

	fi

	ipv6_test testonly || return 2

	# Set value

	/sbin/ip link set dev $device mtu $ipv6_mtu

	return 0

}

## Set a default route

#  $1: <IPv6 address> : gateway, can also contain scope suffix (device name), cause a warning if not matching with $2 (but will have precedence)

#  $2: <gateway device>: gateway device (optional in case of $1 is a global address or $1 contains scope suffix)

#  $3: <check device>: (optional) device to check scope and gateway device against (setup is skipped, if not matching)

# return code: 0=ok 1=argument error 2=IPv6 test fails 3=major problem

ipv6_set_default_route() {

	local fn="ipv6_set_default_route"

	local address=$1

	local device=$2

	local device_check=$3

	ipv6_test testonly || return 2

	# Map the unspecified address to nothing

	if [ "$address" = "::" ]; then

		local address=""

	fi

	if [ -n "$address" ]; then

		local addressgw=$(echo $address | awk -F% '{ print $1 }')

		local device_scope=$(echo $address | awk -F% '{ print $2 }')

		if [ -z "$addressgw" ]; then

			ipv6_log $"Given IPv6 default gateway '$address' is not in proper format" err $fn

			return 3

		fi

		# Scope device has precedence

		if [ -n "$device_scope" -a -n "$device" -a "$device_scope" != "$device" ]; then

			ipv6_log $"Given IPv6 default gateway '$address' has scope '$device_scope' defined, given default gateway device '$device' will be not used" inf $fn

			local device=""

		fi

		# Link local addresses require a device

		if echo $addressgw | LC_ALL=C grep -qi "^fe80:"; then

			if [ -z "$device_scope" ]; then

				if [ -z "$device" ]; then

					ipv6_log $"Given IPv6 default gateway '$address' is link-local, but no scope or gateway device is specified" err $fn

					return 3

				fi

			fi

		fi

		# Check whether the route belongs to the specific given interface

		if [ -n "$device_check" ]; then