#!/bin/sh # # network-functions-ipv6 # # Taken from: # (P) & (C) 1997-2001 by Peter Bieringer # # Version: 2001-07-17a # # Extended address detection is enabled, if 'ipv6calc' is installed # Available here: http://www.bieringer.de/linux/IPv6/tools/index.html#ipv6calc # # Return values # 0 = ok # 1 = error occurs # 2 = not enabled, i.e. no IPv6 kernel support or switched off by configuration ##### Test for "ipv6calc" (used for better existing address detection) EXISTS_ipv6calc=no if which ipv6calc >/dev/null 2>&1; then if ipv6calc --if_inet62addr 3ffe04000100f1010000000000000001 40 | grep -q -v '3ffe:400:100:f101::1/64'; then false elif ipv6calc --addr2if_inet6 3ffe:400:100::1/64 | grep -q -v '3ffe0400010000000000000000000001 00 40'; then false else EXISTS_ipv6calc=yes fi else false fi ##### Test for IPv6 capabilites # $1: (optional) testflag: currently supported: "testonly" (do not load a module) test_ipv6() { 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 echo $"Kernel is not compiled with IPv6 support" return 2 fi fi fi if [ ! -d /proc/sys/net/ipv6/conf/ ]; then return 2 fi if ! which ip 2>&1 >/dev/null; then echo $"Utility 'ip' (from the iproute package) doesn't exist or isn't executable - non-NBMA-styled tunneling setup won't work!" return 2 fi return 0 } ##### Get version of this function libary getversion_ipv6_functions() { local version_ipv6_functions="`cat /etc/sysconfig/network-scripts/network-functions-ipv6 | grep "^# Version:" | awk '{ print $3 }' | sed 's/-//g' | sed 's/[A-Za-z]*$//g'`" echo $version_ipv6_functions } ##### Control IPv6 forwarding # Control IPv6 forwarding # $1: control [yes|no|on|off] # $2: network device (if not given, global IPv6 forwarding is set) [OBSOLETE] forwarding_ipv6() { local fw_control=$1 local fw_device=$2 # maybe empty if [ -z "$fw_control" ]; then echo $"Missing parameter 'forwarding control' (arg 1)" return 1 fi if ! [ "$fw_control" = "yes" -o "$fw_control" = "no" -o "$fw_control" = "on" -o "$fw_control" = "off" ]; then echo $"Don't understand forwarding control parameter '$fw_control' (arg 1)" return 1 fi test_ipv6 || return 2 if [ "$fw_control" = "yes" -o "$fw_control" = "on" ]; then local status=1 else local status=0 fi # Global control? (if no device is given) if [ -z "$fw_device" ]; then sysctl -w net.ipv6.conf.all.forwarding=$status >/dev/null fi # Per device control (not implemented in kernel) if [ ! -z "$fw_device" ]; then echo $"IPv6 forwarding per device cannot be controlled via sysctl - use netfilter6 instead!" fi } ##### 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) ifup_ipv6_route() { local networkipv6=$1 local gatewayipv6=$2 local device=$3 # maybe empty if [ -z "$networkipv6" ]; then echo $"Missing parameter 'IPv6-network' (arg 1)" return 1 fi if [ -z "$gatewayipv6" ]; then echo $"Missing parameter 'IPv6-gateway' (arg 2)" return 1 fi test_ipv6 || return 2 testipv6_valid $networkipv6 || return 2 testipv6_valid $gatewayipv6 || return 2 if [ -z "$device" ]; then local output="`LC_ALL=C route -A inet6 add $networkipv6 gw $gatewayipv6 2>&1`" else if [ "$gatewayipv6" = "::" ]; then local output="`LC_ALL=C route -A inet6 add $networkipv6 dev $device 2>&1`" else local output="`LC_ALL=C route -A inet6 add $networkipv6 gw $gatewayipv6 dev $device 2>&1`" fi fi if [ $? -ne 0 ]; then if echo $output | grep -i -q 'SIOCADDRT: File exists'; then true else echo $output return 2 fi fi return 0 } # Delete a 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) ifdown_ipv6_route() { local networkipv6=$1 local gatewayipv6=$2 local device=$3 # maybe empty if [ -z "$networkipv6" ]; then echo $"Missing parameter 'IPv6-network' (arg 1)" return 1 fi if [ -z "$gatewayipv6" ]; then echo $"Missing parameter 'IPv6-gateway' (arg 2)" return 1 fi test_ipv6 || return 2 # Test, whether given IPv6 address is valid testipv6_valid $networkipv6 || return 2 testipv6_valid $gatewayipv6 || return 2 if [ -z "$device" ]; then local output="`LC_ALL=C route -A inet6 del $networkipv6 gw $gatewayipv6 2>&1`" else if [ "$gatewayipv6" = "::" ]; then local output="`LC_ALL=C route -A inet6 del $networkipv6 dev $device 2>&1`" else local output="`LC_ALL=C route -A inet6 del $networkipv6 gw $gatewayipv6 dev $device 2>&1`" fi fi if [ $? -ne 0 ]; then if echo $output | grep -i -q 'SIOCDELRT: No such process'; then true else echo $output return 2 fi fi return 0 } # Delete all static IPv6 routes through a given interface # $1: Interface # $2: Gateway match (optional) ifdown_ipv6_route_all() { local device=$1 local gatewaymatch=$2 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi test_ipv6 || return 2 # Get all IPv6 routes through given interface and remove them LC_ALL=C route -A inet6 -n | grep "$device\W*$" | while read ipv6net nexthop flags metric ref use iface args; do if [ "$iface" = "$device" ]; then if [ ! -z "$gatewaymatch" ]; then # Test if given gateway matches if [ "$gatewaymatch" != "$nexthop" ]; then continue fi fi # Only non addrconf (automatic installed) routes should be removed if echo $flags | grep -v -q "A"; then local output="`LC_ALL=C route -A inet6 del $ipv6net gw $nexthop dev $iface 2>&1`" fi fi done } ##### automatic tunneling configuration ## Configure automatic tunneling up ifup_ipv6_autotunnel() { test_ipv6 || return 2 # enable IPv6-over-IPv4 tunnels if test_interface_status sit0; then true else # bring up basic tunnel device ifconfig sit0 up if ! test_interface_status sit0; then echo $"Tunnel device 'sit0' enabling didn't work - FATAL ERROR!" return 2 fi # Set sysctls proper (regardless "default") sysctl -w net.ipv6.conf.sit0.forwarding=1 >/dev/null sysctl -w net.ipv6.conf.sit0.accept_ra=0 >/dev/null sysctl -w net.ipv6.conf.sit0.accept_redirects=0 >/dev/null fi return 0 } ## Configure automatic tunneling down ifdown_ipv6_autotunnel() { test_ipv6 || return 2 if test_interface_status sit0; then # disable IPv6-over-IPv4 tunnels (if a tunnel is no longer up) if LC_ALL=C route -A inet6 -n | grep "sit0\W*$" | awk '{ print $2 }' | grep -v -q "^::$"; then # still existing routes, skip shutdown of sit0 true elif LC_ALL=C ip addr show dev sit0 | grep inet6 | awk '{ print $2 }' | grep -v -q '^::'; then # still existing IPv6 addresses, skip shutdown of sit0 true else # take down basic tunnel device sysctl -w net.ipv6.conf.sit0.forwarding=0 >/dev/null sysctl -w net.ipv6.conf.sit0.accept_ra=0 >/dev/null sysctl -w net.ipv6.conf.sit0.accept_redirects=0 >/dev/null ifconfig sit0 down if test_interface_status sit0; then echo $"Tunnel device 'sit0' is still up - FATAL ERROR!" return 2 fi fi fi return 0 } ##### static NBMA-styled tunnel configuration ## Configure static tunnels up # $1: Interface (not needed - dummy) # $2: IPv4 address of foreign tunnel # $3: IPv6 route through this tunnel ifup_ipv6_tunnel() { local device=$1 local addressipv4tunnel=$2 local routeipv6=$3 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi if [ -z "$addressipv4tunnel" ]; then echo $"Missing parameter 'IPv4-tunnel address' (arg 2)" return 1 fi if [ -z "$routeipv6" ]; then echo $"Missing parameter 'IPv6-route' (arg 3)" return 1 fi test_ipv6 || return 2 # Test, whether given IPv6 address is valid testipv6_valid $routeipv6 || return 2 # enable general IPv6-over-IPv4 tunneling ifup_ipv6_autotunnel if [ $? -ne 0 ]; then return 2 fi # Set up a tunnel ifup_ipv6_route $routeipv6 ::$addressipv4tunnel sit0 if [ $? -ne 0 ]; then return 2 fi return 0 } ## Configure static tunnels down # $1: Interface (not used - dummy) # $2: IPv4 address of foreign tunnel # $3: IPv6 route through this tunnel ifdown_ipv6_tunnel() { local device=$1 local addressipv4tunnel=$2 local routeipv6=$3 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi if [ -z "$addressipv4tunnel" ]; then echo $"Missing parameter 'IPv4-tunnel address' (arg 2)" return 1 fi if [ -z "$routeipv6" ]; then echo $"Missing parameter 'IPv6-route' (arg 3)" return 1 fi test_ipv6 || return 2 # Delete a NBMA-styled tunnel ifdown_ipv6_route $routeipv6 ::$addressipv4tunnel sit0 if [ $? -ne 0 ]; then return 2 fi # disable IPv6-over-IPv4 tunneling (if this was the last tunnel) ifdown_ipv6_autotunnel } ## Remove all IPv6 tunnels for a given tunnel endpoint # $1: Interface (not used - dummy) # $2: IPv4-tunnel address ifdown_ipv6_tunnel_all() { local idtuall_device=$1 local idtuall_tunnel=$2 if [ -z "$idtuall_device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi if [ -z "$idtuall_tunnel" ]; then echo $"Missing parameter 'IPv4-tunnel address' (arg 2)" return 1 fi test_ipv6 || return 2 # Get all IPv6 routes through given interface and remove them LC_ALL=C route -A inet6 -n | grep "::$idtuall_tunnel" | while read ipv6net nexthop flags metric ref use iface args; do if [ "::$idtuall_tunnel" = "$nexthop" ]; then if echo $flags | grep -v -q "A"; then # Only non addrconf (automatic installed) routes should be removed ifdown_ipv6_tunnel $idtuall_device $idtuall_tunnel $ipv6net fi fi done # disable IPv6-over-IPv4 tunneling (if this was the last tunnel) ifdown_ipv6_autotunnel return 0 } ##### Test, whether an IPv6 address exists on an interface # $1: Device for testing # $2: Address to test (without prefix) # $3: Prefix of address $1 # return values: 1:problem, 10:not exists, 11:exits test_ipv6_address_exists() { local testdevice=$1 local testaddr=$2 local testprefix=$3 if [ -z "$testaddr" ]; then echo $"Missing parameter 'IPv6AddrToTest' (arg 2)" return 1 fi if [ "$EXISTS_ipv6calc" = "yes" ]; then # Using ipv6calc and compare against /proc/net/if_inet6 local convertresult="`ipv6calc --addr2if_inet6 $testaddr/$testprefix`" # Split in address, scope and prefix length local test_addr="`echo $convertresult | awk '{ print $1 }'`" local test_scope="`echo $convertresult | awk '{ print $2 }'`" local test_prefixlength="`echo $convertresult | awk '{ print $3 }'`" if [ -z "$test_prefixlength" ]; then local testresult="`grep "$test_addr .. .. $test_scope .." /proc/net/if_inet6 | grep $testdevice$`" else local testresult="`grep "$test_addr .. $test_prefixlength $test_scope .." /proc/net/if_inet6 | grep $testdevice$`" fi if [ ! -z "$testresult" ]; then return 11 else return 10 fi else # low budget version, only works if given address is in equal form like "ip" displays local testresult="`LC_ALL=C ip addr show dev $testdevice | grep inet6 | awk '{ print $2 }' | grep -i "^$testaddr/$testprefix$"`" if [ ! -z "$testresult" ]; then return 11 else return 10 fi fi } ##### Interface configuration ## Add an IPv6 address for given interface # $1: Interface # $2: IPv6 address ifup_ipv6_real() { local device=$1 local address=$2 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" ifupdown_ipv6_usage return 1 fi if [ -z "$address" ]; then echo $"Missing parameter 'IPv6-address' (arg 2)" ifupdown_ipv6_usage return 1 fi test_ipv6 || return 2 testipv6_valid $address || return 2 if test_interface_status $device; then true else ifconfig $device up if ! test_interface_status $device; then echo $"Device '$device' enabling didn't work - FATAL ERROR!" return 2 fi fi # Extract address parts local prefixlength_implicit="`echo $address | awk -F/ '{ print $2 }'`" local address_implicit="`echo $address | awk -F/ '{ print $1 }'`" # Only add if address does not already exist test_ipv6_address_exists $device $address_implicit $prefixlength_implicit retval=$? if [ $retval -lt 10 ]; then return 2 fi if [ $retval -eq 11 ]; then true else ifconfig $device add $address || return 2 fi return 0 } ## Remove all IPv6 routes and addresses for given interface # cleanup to prevent kernel crashes # $1: Interface ifdown_ipv6_real_all() { local device=$1 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi test_ipv6 || return 2 # Remove all IPv6 routes through this device (but not "lo") if [ "$device" != "lo" ]; then ip -6 route flush dev $device >/dev/null 2>&1 fi # Remove all IPv6 addresses on this interface ip -6 addr flush dev $device >/dev/null 2>&1 return 0 } ## Remove an IPv6 address on given interface # $1: Interface # $2: IPv6 address ifdown_ipv6_real() { local device=$1 local address=$2 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" ifupdown_ipv6_usage return 1 fi if [ -z "$address" ]; then echo $"Missing parameter 'IPv6-address' (arg 2)" ifupdown_ipv6_usage return 1 fi test_ipv6 || return 2 testipv6_valid $address || return 2 # Extract address parts local prefixlength_implicit="`echo $address | awk -F/ '{ print $2 }'`" local address_implicit="`echo $address | awk -F/ '{ print $1 }'`" # Only remove, if address exists and is not link-local (prevents from kernel crashing) test_ipv6_address_exists $device $address_implicit $prefixlength_implicit local retval=$? if [ $retval -lt 10 ]; then return 2 fi if [ $retval -eq 11 ]; then ifconfig $device del $address || return 2 else true fi return 0 } ##### Some address test functions ## Test a given IPv6 address for valid # $1: IPv6 address # Return code =0:valid 1:not valid 2:general problem testipv6_valid() { local testipv6addr_valid=$1 if [ -z "$testipv6addr_valid" ]; then return 2 fi # Extract parts local prefixlength_implicit="`echo $testipv6addr_valid | awk -F/ '{ print $2 }'`" local address_implicit="`echo $testipv6addr_valid | awk -F/ '{ print $1 }'`" if [ "$EXISTS_ipv6calc" = "yes" ]; then if ! ipv6calc --addr2uncompaddr $testipv6addr_valid >/dev/null 2>&1; then echo $"Given IPv6 address '$testipv6addr_valid' is not valid" return 1 fi else # Test for a valid format if ! echo "$address_implicit" | egrep -q '^[a-fA-F0-9:\.]*$'; then echo $"Given IPv6 address '$testipv6addr_valid' is not valid" return 1 fi fi # Test for prefix length if [ -z "$prefixlength_implicit" ]; then if echo "$testipv6addr_valid" | grep "/$"; then # Trailing "/", but no value echo $"Missing 'prefix length' for given address '$testipv6addr_valid'" return 1 else return 0 fi elif [ $prefixlength_implicit -lt 0 -o $prefixlength_implicit -gt 128 ]; then echo $"'prefix length' on given address '$testipv6addr_valid' is out of range (0-128)" return 1 fi return 0 } ## Test a given IPv4 address for not a private but unicast one # $1: IPv4 address # Return code =0:ok 1:private or not unicast 2:general problem testipv4_globalusable() { local testipv4addr_globalusable=$1 if [ -z "$testipv4addr_globalusable" ]; then return 2 fi # Test for a globally usable IPv4 address now # test 0.0.0.0/8 ipcalc --network $testipv4addr_globalusable 255.0.0.0 | grep -q "NETWORK=0\.0\.0\.0" && return 1 # test 10.0.0.0/8 (private) ipcalc --network $testipv4addr_globalusable 255.0.0.0 | grep -q "NETWORK=10\.0\.0\.0" && return 1 # test 127.0.0.0/8 (loopback) ipcalc --network $testipv4addr_globalusable 255.0.0.0 | grep -q "NETWORK=127\.0\.0\.0" && return 1 # test 169.254.0.0/16 (DHCP link local) ipcalc --network $testipv4addr_globalusable 255.255.0.0 | grep -q "NETWORK=169\.254\.0\.0" && return 1 # test 172.16.0.0/12 (private) ipcalc --network $testipv4addr_globalusable 255.240.0.0 | grep -q "NETWORK=172\.16\.0\.0" && return 1 # test 192.168.0.0/16 (private) ipcalc --network $testipv4addr_globalusable 255.255.0.0 | grep -q "NETWORK=192\.168\.0\.0" && return 1 # test 224.0.0.0/3 (multicast and reserved, broadcast) ipcalc --network $testipv4addr_globalusable 224.0.0.0 | grep -q "NETWORK=224\.0\.0\.0" && return 1 return 0 } ## Test a given device for status # $1: device name # Return code =0:UP 1:not UP 2:not exists test_interface_status() { local device=$1 if [ -z "$device" ]; then echo $"Missing parameter 'device'" echo $"Usage: ifdown_ipv6to4_all interfacename" return 1 fi # Test if device exists if ! LC_ALL=C ifconfig $device >/dev/null 2>&1 ; then return 2 fi # Test if device is up if LC_ALL=C ifconfig $device 2>&1 | grep -q "UP "; then return 0 else return 1 fi } ## Build 6to4 prefix # $1: IPv4 address # RetVal: 6to4address # Returncode 0=ok 1=failure 2=general problem create6to4prefix() { local ipv4addr=$1 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 2 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 } ##### 6to4 tunneling setup ## Configure 6to4 tunneling up # $1: Interface (not needed - dummy) # $2: global IPv4 address of local interface # $3: IPv6 suffix for 6to4 prefix (optional, default is "1") # ReturnCodes 0=ok 1=failure 2=general problem ifup_ipv6to4() { local device=$1 # dummy local localipv4=$2 local localipv6to4suffix=$3 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" ifupdown_ipv6to4_usage return 1 fi if [ -z "$localipv4" ]; then echo $"Missing parameter 'local IPv4 address' (arg 2)" ifupdown_ipv6to4_usage return 1 fi test_ipv6 || return 2 # Generate 6to4 address local prefix6to4="`create6to4prefix $localipv4`" if [ $? -ne 0 -o -z "$prefix6to4" ]; then return 2 fi if [ -z "$localipv6to4suffix" ]; then local address6to4="${prefix6to4}::1/16" else local address6to4="${prefix6to4}::${localipv6to4suffix}/16" fi # Enable general IPv6-over-IPv4 tunneling ifup_ipv6_autotunnel ifup_ipv6_real sit0 $address6to4 if [ $? -ne 0 ]; then return 2 fi return 0 } ## Configure all 6to4 tunneling down # $1: Interface (not needed - dummy) # ReturnCodes 0=ok 1=failure 2=general problem ifdown_ipv6to4_all() { local device=$1 # dummy if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi test_ipv6 || return 2 # Get all configured 6to4 addresses and delete them LC_ALL=C ip addr show dev sit0 | grep inet6 | awk '{ print $2 }' | grep "^2002:" | while read ipv6to4addr; do ifdown_ipv6_real sit0 $ipv6to4addr done # Try to disable general IPv6-over-IPv4 tunneling ifdown_ipv6_autotunnel } ## Configure 6to4 tunneling down # $1: Interface (not needed - dummy) # $2: global IPv4 address of local interface # ReturnCodes 0=ok 1=failure 2=general problem ifdown_ipv6to4() { local device=$1 # dummy local localipv4=$2 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi if [ -z "$localipv4" ]; then echo $"Missing parameter 'local IPv4 address' (arg 2)" return 1 fi test_ipv6 || return 2 # generate 6to4 address local prefix6to4="`create6to4prefix $localipv4`" echo $"Generated 6to4 prefix '$prefix6to4' from '$localipv4'" if [ $? -ne 0 -o -z "$prefix6to4" ]; then return 2 fi if [ -z "$localipv6to4suffix" ]; then local address6to4="$prefix6to4::1/16" else local address6to4="${prefix6to4}::${localipv6to4suffix}/16" fi ifdown_ipv6_real sit0 $address6to4 if [ $? -ne 0 ]; then return 2 fi # Try to disable general IPv6-over-IPv4 tunneling ifdown_ipv6_autotunnel if [ $? -ne 0 ]; then return 2 fi return 0 } ##### static tunnel device configuration ## Configure a static tunnel device up # $1: Interface # $2: IPv4 address of foreign tunnel # $3: Local IPv6 address of a P-t-P tunnel (optional) ifup_ipv6_tunneldev() { local device=$1 local addressipv4tunnel=$2 local addressipv6local=$3 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi if [ -z "$addressipv4tunnel" ]; then echo $"Missing parameter 'IPv4-tunnel address' (arg 2)" return 1 fi test_ipv6 || return 2 if ! test_interface_status $device; then local ttldefault="`sysctl 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 (does not catch IPv4 addresses with leading 0's) LC_ALL=C ip tunnel show | grep $addressipv4tunnel | while read dev type tag remote tag local tag ttl rest; do local devnew="`echo $dev | sed 's/:$//g'`" if [ "$remote" = "$addressipv4tunnel" ]; then echo $"Given remote address '$addressipv4tunnel' on tunnel device '$device' is already configured on device '$devnew' - FATAL ERROR!" return 2 fi done if [ $? -ne 0 ]; then return 2 fi ip tunnel add $device mode sit ttl $ttldefault remote $addressipv4tunnel # Test, whether "ip tunnel show" works without error ip tunnel show $device >/dev/null 2>&1 if [ $? -ne 0 ]; then echo $"Tunnel device '$device' creation didn't work - ERROR!" return 2 fi # Test, whether "ip tunnel show" reports valid content if ! ip tunnel show $device | grep -q "remote"; then echo $"Tunnel device '$device' creation didn't work - ERROR!" return 2 fi ifconfig $device up if ! test_interface_status $device; then echo $"Tunnel device '$device' bringing up didn't work - ERROR!" return 2 fi # Set sysctls proper (regardless "default") sysctl -w net.ipv6.conf.$device.forwarding=1 >/dev/null sysctl -w net.ipv6.conf.$device.accept_ra=0 >/dev/null sysctl -w net.ipv6.conf.$device.accept_redirects=0 >/dev/null if [ ! -z "$addressipv6local" ]; then # Setup P-t-P address ifup_ipv6_real $device $addressipv6local if [ $? -ne 0 ]; then return 2 fi fi else false fi return 0 } ## Configure a static tunnel device down # $1: Interface ifdown_ipv6_tunneldev() { local device=$1 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi test_ipv6 || return 2 if test_interface_status $device; then ifdown_ipv6_real_all $device else if [ "$device" != "sit0" ]; then false fi fi if [ "$device" != "sit0" ]; then if ip tunnel | grep -q "^$device:" ; then ip tunnel del $device if test_interface_status $device; then false fi else false fi fi return 0 } ## Set IPv6 MTU for a device # $1: Interface # $2: IPv6 MTU ipv6_set_mtu() { local device=$1 local ipv6_mtu=$2 if [ -z "$device" ]; then echo $"Missing parameter 'device' (arg 1)" return 1 fi if [ -z "$ipv6_mtu" ]; then echo $"Missing parameter 'IPv6 MTU' (arg 2)" return 1 fi # Check range if [ $ipv6_mtu -lt 1280 -o $ipv6_mtu -gt 65535 ]; then echo $"Given IPv6 MTU is out of range" return 1 fi sysctl -w net.ipv6.conf.$device.mtu=$ipv6_mtu >/dev/null }