#!/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