#!/bin/bash family=arp for hook in input output do for prioname in raw mangle dstnat security srcnat do $NFT add table $family x $NFT add chain $family x y "{ type filter hook $hook priority $prioname; }" &> /dev/null if (($? == 0)) then echo "E: $prioname should not be a valid priority name for arp family chains." >&2 exit 0 fi done done exit 1