#!/bin/bash

set -e

tmpfile=$(mktemp)
if [ ! -w $tmpfile ] ; then
        echo "Failed to create tmp file" >&2
        exit 0
fi

trap "rm -rf $tmpfile" EXIT # cleanup if aborted

RULESET="add table x
add chain x y
add rule x y jump y"

echo "$RULESET" > $tmpfile
# kernel must return ELOOP
$NFT -f $tmpfile 2>/dev/null
echo "E: allowing jump to chain loop"