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#!/bin/sh
#
# network-functions-ipv6
#
# Taken from:
# (P) & (C) 1997-2001 by Peter Bieringer <pb@bieringer.de>
#
# Version: 2001-02-05
#
# Filter tags (for stripping, empty lines following if all is stripped)
# 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()
{
# Test for IPv6 enabled kernel
if ! [ -f /proc/net/if_inet6 ]; then
echo "Did not find IPv6 in kernel, trying to load module"
modprobe ipv6
if ! [ -f /proc/net/if_inet6 ]; then
echo "Kernel not compiled for IPv6 - stop!"
return 2
fi
fi
# Test for IPv6 enabled needed binaries
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
return 0
}
##### Control IPv6 forwarding
# Display usage
function forwarding_ipv6_usage() {
echo "Usage: $0 yes|no [device]"
}
# Control IPv6 forwarding
# $1: control [yes|no|on|off]
# $2: network device (if not given, global IPv6 forwarding is set)
function forwarding_ipv6() {
control=$1
device=$2 # maybe empty
if [ -z $control ]; then
echo "Missing option forwarding control'"
forwarding_ipv6_usage
return 1
fi
if ! [ "$control" = "yes" -o "$control" = "no" -o "$control" = "on" -o "$control" = "off" ]; then
echo "Don't understand forwarding control option '$control'"
forwarding_ipv6_usage
return 1
fi
# Device "lo" need no IPv6 configuration
if [ "$device" = "lo" ]; then
return 0;
fi
# Run IPv6 test
test_ipv6 || return
if [ "$control" = "yes" -o "$control" = "on" ]; then
status=1
else
status=0
fi
# Global control? (if no device is given)
if [ -z $device ]; then
if [ -f /proc/sys/net/ipv6/conf/all/forwarding ]; then
echo "$status" > /proc/sys/net/ipv6/conf/all/forwarding
fi
fi
# Per device control
if [ ! -z $device ]; then
if [ -f /proc/sys/net/ipv6/conf/$device/forwarding ]; then
echo "$string IPv6 forwarding for device '$device'"
echo "$status" > /proc/sys/net/ipv6/conf/$device/forwarding
fi
fi
}
##### Static IPv6 route configuration
# Display usage
function ifupdown_ipv6_route_usage() {
echo $"Usage: $0 IPv6-network IPv6-gateway [device]"
}
# Set static IPv6 route
# $1: IPv6 network to route
# $2: IPv6 gateway over which $1 should be routed
# $3: Interface (optional)
function ifup_ipv6_route() {
networkipv6=$1
gatewayipv6=$2
device=$3 # maybe empty
if [ -z $networkipv6 ]; then
echo $"Missing option 'IPv6-network'"
ifupdown_ipv6_route_usage
return 1
fi
if [ -z $gatewayipv6 ]; then
echo "Missing option 'IPv6-gateway'"
ifupdown_ipv6_route_usage
return 1
fi
# Device "lo" need no IPv6 configuration
if [ "$device" = "lo" ]; then
return 0;
fi
# Run IPv6 test
test_ipv6 || return
if [ -z $device ]; then
route -A inet6 add $networkipv6 gw $gatewayipv6
else
route -A inet6 add $networkipv6 gw $gatewayipv6 dev $device
fi
}
# Delete static IPv6 route
# $1: IPv6 network to route
# $2: IPv6 gateway over which $1 should be routed
# $3: Interface (optional)
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 $"Missing option 'IPv6-gateway'"
ifup_ipv6_route_usage
return 1
fi
# Device "lo" need no IPv6 configuration
if [ "$device" = "lo" ]; then
return 0;
fi
# Run IPv6 test
test_ipv6 || return
if [ -z $device ]; then
echo "Delete IPv6 route '$networkipv6' gateway '$gatewayipv6'"
route -A inet6 del $networkipv6 gw $gatewayipv6
else
route -A inet6 del $networkipv6 gw $gatewayipv6 dev $device
fi
}
##### automatic tunneling configuration
## Configure automatic tunneling up
function ifup_ipv6_autotunnel() {
# Run IPv6 test
test_ipv6 || return
# enable IPv6-over-IPv4 tunnels
if ifconfig sit0 | grep -q "UP "; then
# already up, do nothing
true
else
# basic tunnel device to up
ifconfig sit0 up
# Switch on forwarding
forwarding_ipv6 on sit0
fi
}
## Configure automatic tunneling down
function ifdown_ipv6_autotunnel() {
# Run IPv6 test
test_ipv6 || return
# disable IPv6-over-IPv4 tunnels (if a tunnel is no longer up)
if route -A inet6 -n | grep sit0 | grep -v -q "^::"; then
# existing routes, do nothing
true
else
# basic tunnel device to down
echo "Bring down basic tunnel device 'sit0'"
# Switch off forwarding
forwarding_ipv6 off sit0
ifconfig sit0 down
fi
}
##### static tunneling configuration
function ifupdown_ipv6_tunnel_usage() {
echo "Usage: $0 interfacename IPv4-tunneladdress IPv6-route"
}
## Configure static tunnels up
# $1: Interface (not needed - dummy)
# $2: IPv4 address of foreign tunnel
# $3: IPv6 route through this tunnel
function ifup_ipv6_tunnel() {
device=$1
addressipv4tunnel=$2
routeipv6=$3
if [ -z $device ]; then
echo "Missing option 'device'"
ifupdown_ipv6_tunnel_usage
return 1
fi
if [ -z $addressipv4tunnel ]; then
echo "Missing option 'IPv4-tunneladdress'"
ifupdown_ipv6_tunnel_usage
return 1
fi
if [ -z $routeipv6 ]; then
echo "Missing option 'IPv6-route'"
ifupdown_ipv6_tunnel_usage
return 1
fi
# Run IPv6 test
test_ipv6 || return
# enable general IPv6-over-IPv4 tunneling
ifup_ipv6_autotunnel
# Set up a tunnel
route -A inet6 add $routeipv6 gw ::$addressipv4tunnel dev sit0
}
## Configure static tunnels down
# $1: Interface (not used - dummy)
# $2: IPv4 address of foreign tunnel
# $3: IPv6 route through this tunnel
function ifdown_ipv6_tunnel() {
device=$1
addressipv4tunnel=$2
routeipv6=$3
if [ -z $device ]; then
echo "Missing option 'device'"
ifupdown_ipv6_tunnel_usage
return 1
fi
if [ -z $addressipv4tunnel ]; then
echo "Missing option 'IPv4-tunneladdress'"
ifupdown_ipv6_tunnel_usage
return 1
fi
if [ -z $routeipv6 ]; then
echo "Missing option 'IPv6-route'"
ifupdown_ipv6_tunnel_usage
return 1
fi
# Run IPv6 test
test_ipv6 || return
# Set up a tunnel
route -A inet6 del $routeipv6 gw ::$addressipv4tunnel dev sit0
# disable IPv6-over-IPv4 tunneling (if no longer a tunnel is up)
ifdown_ipv6_autotunnel
}
##### Interface configuration
function ifupdown_ipv6_usage() {
echo "Usage: $0 interfacename IPv6-address [IPv6-prefixlength]"
}
## Add an IPv6 address for given interface
# $1: Interface
# $2: IPv6 address
# $3: IPv6 prefix length (optional)
function ifup_ipv6_real() {
device=$1
address=$2
prefixlength=$3
if [ -z $device ]; then
echo "Missing option 'device'"
ifupdown_ipv6_usage
return 1
fi
# Device "lo" need no IPv6 configuration
if [ "$device" = "lo" ]; then
return 0;
fi
if [ -z $address ]; then
echo "Missing option 'IPv6-address'"
ifupdown_ipv6_usage
return 1
fi
# Test status of interface
if ifconfig $device | grep -q "UP "; then
# Interface is up
true
else
# no IPv4 for this interface, interface is still down, do up ...
ifconfig $device up
fi
# Extract address parts
prefixlength_implicit="`echo $address | awk -F/ '{ print $2 }'`"
address_implicit="`echo $address | awk -F/ '{ print $1 }'`"
# Overwrite optional given one
if [ ! -z $prefixlength_implicit ]; then
prefixlength=$prefixlength_implicit
elif [ -z $prefixlength ]; then
prefixlength=128
fi
# Build IPv6 address
address="$address_implicit/$prefixlength"
# Run IPv6 test
test_ipv6 || return
# Only add, if address do not already exist
address_configured="`ifconfig $device | grep "inet6 addr:" | grep "$address" | awk '{ print $3 }'`"
address_configured_type="`ifconfig $device | grep "inet6 addr:" | grep "$address" | awk '{ print $4 }'`"
if [ "$address_configured" = "$address" ]; then
true
else
ifconfig $device add $address || return 2
fi
# route -A inet6 add $address/$prefixlength dev $device || return 2
}
## Remove all IPv6 routes and addresses for given interface
# cleanup to prevent kernel crashes
# $1: Interface
function ifdown_ipv6_real_all() {
device=$1
if [ -z $device ]; then
echo "Missing option 'device'"
echo "Usage: ifdown_ipv6_real_all interfacename"
return 1
fi
# Get all IPv6 routes through given interface and remove them
route -A inet6 | grep $device | while read ipv6net nexthop flags metric ref use iface args; do
if [ "$device" = "$iface" ]; then
if echo $flags | grep -v -q "A"; then
# Only non addrconf (automatic installed) routes should be removed
ifdown_ipv6_route $ipv6net $nexthop $iface
fi
fi
done
# Get all IPv6 addresses assigned to given interface and remove them
ifconfig $device | grep "inet6 addr:" | awk '{ print $3 }' | while read ipv6addr args; do
ifdown_ipv6_real $device $ipv6addr
done
}
## Remove an IPv6 address on given interface
# $1: Interface
# $2: IPv6 address
# $3: IPv6 prefix length (optional)
function ifdown_ipv6_real() {
device=$1
address=$2
prefixlength=$3
if [ -z $device ]; then
echo "Missing option 'device'"
ifupdown_ipv6_usage
return 1
fi
# Device "lo" need no IPv6 configuration
if [ "$device" = "lo" ]; then
return 0;
fi
if [ -z $address ]; then
echo "Missing option 'IPv6-address'"
ifupdown_ipv6_usage
return 1
fi
# Extract address parts
prefixlength_implicit="`echo $address | awk -F/ '{ print $2 }'`"
address_implicit="`echo $address | awk -F/ '{ print $1 }'`"
# Overwrite optional given one
if [ ! -z $prefixlength_implicit ]; then
prefixlength=$prefixlength_implicit
elif [ -z $prefixlength ]; then
prefixlength=128
fi
# Build IPv6 address
address="$address_implicit/$prefixlength"
# Run IPv6 test
test_ipv6 || return
#
# route -A inet6 del $address/$prefixlength dev $device || return 2
# Only remove, if address exists and is not link-local (prevents from kernel crashing)
address_configured="`ifconfig $device | grep "inet6 addr:" | grep "$address" | awk '{ print $3 }'`"
address_configured_type="`ifconfig $device | grep "inet6 addr:" | grep "$address" | awk '{ print $4 }'`"
if [ ! -z "$address_configured" ]; then
if [ "$address_configured_type" = "Scope:Link" ]; then
true
else
ifconfig $device del $address || return 2
fi
else
true
fi
}
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