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|
#!/bin/sh
#
# ip-up.ipv6to4
#
#
# 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/
#
# Version 2002-11-14
#
# Calling parameters:
# $1: interface name
#
# Called (mostly) by /etc/ppp/ip-up.local
# like: /etc/ppp/ip-up.ipv6to4 $1 >>/var/log/ppp-ipv6to4.log 2>&1
#
# Note: this script will *kill* older still existing 6to4 tunnels regardless
# whether they were set before by another device
#
# Uses following information from /etc/sysconfig/network:
# NETWORKING_IPV6=yes|no: controls IPv6 initialization (global setting)
#
# Uses following information from /etc/sysconfig/network-scripts/ifcfg-$1:
# IPV6TO4INIT=yes|no: controls configuration
# IPV6TO4_IPV4ADDR=<IPv4 address>: special local address for 6to4 tunneling (only needed behind a NAT gateway)
# IPV6TO4_RELAY=<IPv4 address>: remote 6to4 relay router address (default: 192.88.99.1)
# IPV6TO4_MTU=<MTU for IPv6>: controls IPv6 MTU for the 6to4 link (optional, default is MTU of interface - 20)
# IPV6TO4_ROUTING="<device>-<suffix>/<prefix length> ...": information to setup local subnetting
# Example: IPV6TO4_ROUTING="eth0-:f101::0/64 eth1-:f102::0/64"
#
# IPV6_CONTROL_RADVD=yes|no: controls radvd triggering
# IPV6_RADVD_PIDFILE=<file>: PID file of radvd for sending signals, default is "/var/run/radvd/radvd.pid"
# IPV6_RADVD_TRIGGER_ACTION=startstop|reload|restart|SIGHUP: how to trigger radvd (optional, default is SIGHUP)
#
# Requirements
# radvd-0.6.2p3 or newer supporting option "Base6to4Interface"
#
if [ -z "$1" ]; then
echo $"Argument 1 is empty but should contain interface name - skip IPv6to4 initialization"
exit 1
fi
# 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" != "$REALDEVICE" ] && exit 0
# Test whether IPv6 should be configured, else stop
[ "$NETWORKING_IPV6" = "yes" ] || exit 0
if [ ! -f /etc/sysconfig/network-scripts/network-functions-ipv6 ]; then
exit 1
fi
. /etc/sysconfig/network-scripts/network-functions-ipv6
# Run basic IPv6 test (and make sure the ipv6 module will be loaded), if not ok, skip IPv6 initialization
ipv6_test || exit 1
# Setup of 6to4, if configured
valid6to4config="yes"
if [ "$IPV6TO4INIT" = "yes" ]; then
if [ -n "$IPV6TO4_IPV4ADDR" ]; then
# Take 6to4-dedicated configured IPv4 address from config file (precedence 1)
ipv4addr="$IPV6TO4_IPV4ADDR"
else
# Get IPv4 address from interface (precedence 2)
ipv4addr="`ipv6_get_ipv4addr_of_device $DEVICE`"
if [ -z "$ipv4addr" ]; then
# Take configured IPv4 address of interface from config file (precedence 3)
ipv4addr="$IPADDR"
fi
fi
if [ -n "$ipv4addr" ]; then
# Test for non-global IPv4 address
if ! ipv6_test_ipv4_addr_global_usable $ipv4addr; then
echo $"Given IPv4 address '$ipv4addr' is not globally usable"
valid6to4config="no"
fi
else
echo $"IPv6to4 configuration needs an IPv4 address on related interface or otherwise specified"
valid6to4config="no"
fi
if [ -z "$IPV6TO4_RELAY" ]; then
IPV6TO4_RELAY="192.88.99.1"
fi
# Check/generate relay address
ipv6to4_relay="`ipv6_create_6to4_relay_address $IPV6TO4_RELAY`"
if [ $? -ne 0 ]; then
valid6to4config="no"
fi
if [ "$valid6to4config" = "yes" ]; then
# Delete routes to local networks
for devsuf in $IPV6TO4_ROUTING; do
dev="`echo $devsuf | awk -F- '{ print $1 }'`"
ipv6_cleanup_routes $dev ::
done
# Cleanup all old data (needed, if "ip-down.ipv6to4" wasn't executed), delete all configured 6to4 address
ipv6_cleanup_6to4_tunnels tun6to4
# Get MTU of master device
ipv4mtu="`ipv6_exec_ip link show dev $DEVICE | grep -w "mtu" | awk '{ print $5 }'`"
if [ -n "$ipv4mtu" ]; then
# IPv6 tunnel MTU is IPv4 MTU minus 20 for IPv4 header
tunnelmtu=$[ $ipv4mtu - 20 ]
fi
if [ -n "$IPV6TO4_MTU" ]; then
if [ $IPV6TO4_MTU -gt $tunnelmtu ]; then
echo $"Warning: configured MTU '$IPV6TO4_MTU' for 6to4 exceeds maximum limit of '$tunnelmtu', ignored"
else
tunnelmtu=$IPV6TO4_MTU
fi
fi
# Setup new data
ipv6_add_6to4_tunnel tun6to4 $ipv4addr "" $tunnelmtu || exit 1
# Add route to for compatible addresses (removed later again)
ipv6_add_route "::/96" "::" tun6to4
# Add default route, if device matches
if [ "$IPV6_DEFAULTDEV" = "tun6to4" ]; then
if [ -n "$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 $gateway tun6to4
done
fi
# Setup additional static IPv6 routes (newer config style)
if [ -f "/etc/sysconfig/network-scripts/route6-tun6to4" ]; then
cat "/etc/sysconfig/network-scripts/route6-tun6to4" | sed 's/#.*//g' | grep -v '^[[:space:]]*$' | while read line; do
if echo "$line" | grep -vq 'via'; then
# Add gateway if missing
line="$line via $ipv6to4_relay"
fi
ipv6_exec_ip -6 route add $line
done
fi
# Cleanup autmatically generated autotunnel (not needed for 6to4)
ipv6_del_route "::/96" "::" tun6to4
ipv6_del_addr_on_device tun6to4 "::$ipv4addr/128"
if [ "$IPV6_CONTROL_RADVD" = "yes" ]; then
# Control running radvd
ipv6_trigger_radvd up "$IPV6_RADVD_TRIGGER_ACTION" $IPV6_RADVD_PIDFILE
if [ -n "$IPV6TO4_ROUTING" ]; then
# Generate 6to4 address
ipv6to4prefix="`ipv6_create_6to4_prefix $ipv4addr`"
if [ -n "$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
fi
fi
fi
|
