altibox-6rd.wanup

#!/bin/sh
# Place it in /jffs/etc/config/altibox-6rd.wanup, and then ln -s /jffs/etc/config/altibox-6rd.ipup to it.
# This script is inredible untested, and is currently used mostly as notes...

# The Altibox 6rd gateway.
REMOTE=213.167.115.92

# Your local IP address.
LOCAL="$(ifconfig eth1 | sed -n '/inet /{s/.*addr://;s/ .*//;p}')"
LOCAL_HEX=$(printf '%02X%02X%02X%02X' $(echo $LOCAL | tr '.' ' ') | awk '{print substr($1,1,
1) substr($1,2,4) substr($1,6)}')

# this will only work with prefix length 30
LOCAL_PREFIX=$(printf %X $(echo -n "$(printf %d 0x$LOCAL_HEX) 4 mul p"|dc))

# hacky way to "do" impresise 64-bit math, also only works with prefix length 30
LOCAL_MSB=$(echo -n "16 o 0x$LOCAL_PREFIX 0x2A01079C00000000 add 0x100000000 div p" | dc)
LOCAL_LSB=$(echo -n "16 o 0x$LOCAL_PREFIX 0xffffffff and p" |dc)
V6PREFIX=$(echo -n $LOCAL_MSB$LOCAL_LSB | awk '{print substr($1,1,4) ":" substr($1,5,4) ":" substr($1,9,4) ":" substr($1, 13, 4)}')

# The local address that will wind up assigned to your bridge
V6LOCAL=$V6PREFIX::1/62

# The remote address bound to the sit tunnel to the 6rd gateway
V6REMOTE=$V6PREFIX::2/30

# The name of the tunnel
TUNNEL=altibox-6rd

# The MTU of the tunnel.  It is the PPP MTU - 20 bytes.
MTU=1472

# Make sure we have needed kernel modules
insmod ipv6
insmod sit

# Clean up any leftovers.  This ensures we start with a fresh tunnel whenever the PPP link bounces.
killall radvd
ip -6 addr flush dev br0 scope global
ip -6 addr flush dev $TUNNEL scope global
ip -6 route flush dev br0
ip -6 route flush dev $TUNNEL
ip link set $TUNNEL down
ip tunnel del $TUNNEL

# Create our tunnel.
ip tunnel add $TUNNEL mode sit remote $REMOTE local $LOCAL ttl 64
ip link set $TUNNEL up
ip link set mtu $MTU dev $TUNNEL
ip addr add $V6REMOTE dev $TUNNEL
ip addr add $V6LOCAL dev br0
ip route add ::/0 dev $TUNNEL

# Make sure we forward IPv6 packets
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding

# Create an RADVD config file and start radvd to let everyone on our local network get an auto-assigned IP6 address.
cat >/tmp/radvd.conf <<EOF 
interface br0 {
  AdvLinkMTU $MTU; 
  AdvSendAdvert on;
  prefix $V6PREFIX::/64 { 
    AdvOnLink on; 
    AdvAutonomous on;
    AdvRouterAddr on;
  }; 
};
EOF

radvd -C /tmp/radvd.conf

# Profit.