NDProxy and prefix translation service

ndproxy.sh

#!/bin/sh

SRC_IF=$1
SRC_PREFIX=$2
DST_IF=$3
DST_PREFIX=$4
DST_IF_IP=$(ifconfig $DST_IF | grep $4 | awk '{print $2}')

# インターフェイスの ND Proxy を有効にする
sysctl net.ipv6.conf.$1.proxy_ndp=1 &> /dev/null

while true; do
    PROXIED=$(ip -6 neigh show proxy dev $SRC_IF | grep $2 | awk '{print $1}' | sort)
    CANDIDATE=$(ip -6 neigh show dev $DST_IF | grep $4 | awk '{print $1}' | sed "s/$4/$2/g" | sort)
    MAC_ADDR=$(ip -6 neigh show dev $DST_IF | awk '{print $3}' | uniq | sort)

    # ND を定期的に送って強制的に ULA を解決する
    for mac in $MAC_ADDR; do
        LL=$(ip -6 neigh show dev $DST_IF | grep fe80: | awk '{print $1}')
        for ll in $LL; do
            ndisc6 -s $DST_IF_IP $ll $DST_IF &> /dev/null
        done
    done

    touch /tmp/ndproxy_src_ip
    for proxy in $PROXIED; do
        echo $proxy >> /tmp/ndproxy_src_ip
    done

    touch /tmp/ndproxy_dst_ip
    for candidate in $CANDIDATE; do
        echo $candidate >> /tmp/ndproxy_dst_ip
    done

    diff --old-line-format='' --unchanged-line-format='' --new-line-format='%L' /tmp/ndproxy_src_ip /tmp/ndproxy_dst_ip | xargs -i sh -c "echo New address added: {} && ip -6 neigh add proxy {} dev $SRC_IF"
    diff --old-line-format='%L' --unchanged-line-format='' --new-line-format='' /tmp/ndproxy_src_ip /tmp/ndproxy_dst_ip | xargs -i sh -c "echo Staled address deleted: {} && ip -6 neigh del proxy {} dev $SRC_IF"
    rm /tmp/ndproxy_*

    sleep 3
done