From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: [PATCH 7/7] extensions: libip6t_dst: make inversion work
Date: Thu, 19 Feb 2015 14:37:21 +0100
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Cc: Florian Westphal <fw@strlen.de>, netfilter-devel@vger.kernel.org
To: Jan Engelhardt <jengelh@inai.de>
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Jan Engelhardt <jengelh@inai.de> wrote:
> On Thursday 2015-02-19 14:11, Florian Westphal wrote:
> 
> >The inversion flag wasn't set in the match struct.
> 
> The documentation needs to be updated too.
> 
> It reflected what source code did: not supportting the "!" option at 
> all/silently ignoring it.

Interesting, --help does mention it:
dst match options:
[!] --dst-len length            total length of this header

So, whats the desired action?

Given that the kernel already supports it (on kernel side its
a module alias for hop-by-hop match) I'd vote for just also updating
the man page snippet to mention ! as well, since it seems like artifical
restriction.