#!/bin/bash

set -e

$NFT add table ip filter

$NFT add chain ip filter input { type filter hook input priority 0\; }

for ((i=0;i<20;i++)); do

	$NFT add chain ip filter a$i

done

$NFT add rule ip filter input jump a1

for ((i=0;i<10;i++)); do

	$NFT add rule ip filter a$i jump a$((i+1))

done

for ((i=11;i<19;i++)); do

	$NFT add rule ip filter a$i jump a$((i+1))

done

$NFT add rule ip filter a10 jump a11 || exit 0

echo "E: Expected 20th jump to fail due to jump stack exhaustion" 1>&2

exit 1