99-ifup-wan.sh

#!/bin/sh

INTERNAL_IPV6_ADDRESS_RANGE=2001:db8::/64
TARGET_INTERFACE=wan
REAL_INTERFACE=pppoe-$TARGET_INTERFACE

if [ "${INTERFACE}" = "$TARGET_INTERFACE" ]; then
    case "${ACTION}" in
    ifup|ifupdate)
        ip route del default dev $REAL_INTERFACE proto static metric 0
        sh -x /usr/sbin/nptv6.sh $REAL_INTERFACE $INTERNAL_IPV6_ADDRESS_RANGE connect
        ip -6 ro ad default dev $REAL_INTERFACE proto static metric 512 pref medium
    ;;
    ifdown)
        sh -x /usr/sbin/nptv6.sh $REAL_INTERFACE $INTERNAL_IPV6_ADDRESS_RANGE
    ;;
    *) ;;
    esac
fi

nptv6.sh

#!/bin/sh

INTERFACE=$1
TARGET_IP_RANGE=$2
OPERATION=$3


function show_help {
    echo 'Usage: nptv6.sh Interface LAN_IPv6_Range [Operation]'
    echo 'Example:   nptv6.sh pppoe-wan fd00::/64'
    echo '           nptv6.sh pppoe-wan fd00::/64 connect'
    echo 'Operation only have one option: connect.'
    echo '   If Operation is connect, this script will find IP'
    echo '   address for user define interface. Only the first IP'
    echo '   of this interface will be used.'
}

if [ ! $INTERFACE ]
then
    show_help
    exit 1
fi
if [ ! $TARGET_IP_RANGE ]
then
    show_help
    exit 1
fi

touch /tmp/nptv6-$INTERFACE
LAST_IP=`cat /tmp/nptv6-$INTERFACE`

if [ "$LAST_IP" != "" ]
then
    echo Remove history iptables rule
    ip6tables -t nat -D POSTROUTING -o $INTERFACE -j NETMAP \
        --to $LAST_IP -s $TARGET_IP_RANGE
    ip6tables -t nat -D PREROUTING -i $INTERFACE -j NETMAP \
        -d $LAST_IP --to $TARGET_IP_RANGE
    echo '' > /tmp/nptv6-$INTERFACE
fi

if [ $OPERATION == "connect" ]
then
    CURRENT_IP=`ip address show dev $INTERFACE to ::/0 scope global | grep inet | sed 's/.*inet6 \([a-f0-9:]*\/\d*\).*/\1/g'`
    echo Current IP is: $CURRENT_IP
    echo $CURRENT_IP > /tmp/nptv6-$INTERFACE
    ip6tables -t nat -A POSTROUTING -o $INTERFACE -j NETMAP \
        --to $CURRENT_IP -s $TARGET_IP_RANGE
    ip6tables -t nat -A PREROUTING -i $INTERFACE -j NETMAP \
        -d $CURRENT_IP --to $TARGET_IP_RANGE
fi

OpenWRT-19.07-NPTv6-scripts.md

OpenWRT-19.07-NPTv6-scripts

LICENSE

WTFPL