#!/bin/bash

set -e

$NFT add table t
$NFT add chain t c1
$NFT add chain t c2
$NFT add map t m {type inet_service : verdict \;}
$NFT add element t m {2 : jump c2}
$NFT add rule t c1 tcp dport vmap @m

# kernel should return ELOOP
$NFT add element t m {1 : jump c1} 2>/dev/null || exit 0
echo "E: accepted endless jump loop in a vmap" >&2
exit 1