From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=NQ4I=2P=vger.kernel.org=netfilter-devel-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no
	autolearn_force=no version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id C934AC2D0DA
	for <netfilter-devel@archiver.kernel.org>; Wed, 25 Dec 2019 17:50:25 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [209.132.180.67])
	by mail.kernel.org (Postfix) with ESMTP id 9D6F32072A
	for <netfilter-devel@archiver.kernel.org>; Wed, 25 Dec 2019 17:50:25 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1726399AbfLYRuZ (ORCPT
        <rfc822;netfilter-devel@archiver.kernel.org>);
        Wed, 25 Dec 2019 12:50:25 -0500
Received: from Chamillionaire.breakpoint.cc ([193.142.43.52]:60984 "EHLO
        Chamillionaire.breakpoint.cc" rhost-flags-OK-OK-OK-OK)
        by vger.kernel.org with ESMTP id S1726353AbfLYRuZ (ORCPT
        <rfc822;netfilter-devel@vger.kernel.org>);
        Wed, 25 Dec 2019 12:50:25 -0500
Received: from fw by Chamillionaire.breakpoint.cc with local (Exim 4.92)
        (envelope-from <fw@strlen.de>)
        id 1ikAnf-0001au-Mc; Wed, 25 Dec 2019 18:50:23 +0100
Date:   Wed, 25 Dec 2019 18:50:23 +0100
From:   Florian Westphal <fw@strlen.de>
To:     netfilter-devel@vger.kernel.org, florz@florz.de
Subject: Re: [nftables] bug: rejects single-element intervals as supposedly
 empty
Message-ID: <20191225175023.GG795@breakpoint.cc>
References: <20191225154106.x6mmx3m6hi7ksrao@florz.florz.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20191225154106.x6mmx3m6hi7ksrao@florz.florz.de>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: netfilter-devel-owner@vger.kernel.org
Precedence: bulk
List-ID: <netfilter-devel.vger.kernel.org>
X-Mailing-List: netfilter-devel@vger.kernel.org

Florian Zumbiehl <florz@florz.de> wrote:
> I stumbled upon this bug in the Debian buster backports version of nftables
> (0.9.2-1~bpo10+1), the git commit log doesn't look like this has been fixed
> since, so here it is:
> 
> | # nft add rule foo bar udp dport 1-1
> | Error: Range has zero or negative size
> | add rule foo bar udp dport 1-1

I'd guess this is intentional and nft assumes user
meant something else such as 1-2 or 1-11.

We could autotranslate this to "dport 1" but I'm not sure its right.