From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: [RFC PATCH 1/1 libnetfilter_conntrack] zero value handling of
 mark and zone
Date: Thu, 12 Jun 2014 13:59:25 +0200
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To: Ken-ichirou MATSUZAWA <chamaken@gmail.com>
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Ken-ichirou MATSUZAWA <chamaken@gmail.com> wrote:
>  Hello, thank you for taking your time.
> 
> 2014-06-12 18:48 GMT+09:00 Florian Westphal <fw@strlen.de>:
> > ct1 and ct2 zones would then always be equal except if
> > both have ATTR_ZONE set and the zones are different.
> 
> I think it reasonable too, but attr holds old value if it was unset.

Yes, but nfct_get_attr_u* return 0 if attribute bit is unset.

So I think this should work.