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Date:   Mon, 25 Jul 2022 23:39:14 +0200
From:   Florian Westphal <fw@strlen.de>
To:     Erik Skultety <eskultet@redhat.com>
Cc:     netfilter-devel@vger.kernel.org
Subject: Re: [iptables PATCH] iptables: xshared: Ouptut '--' in the opt field
 in ipv6's fake mode
Message-ID: <20220725213914.GC20457@breakpoint.cc>
References: <bb391c763171f0c5511f73e383e1b2e6a53e2014.1658322396.git.eskultet@redhat.com>
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Erik Skultety <eskultet@redhat.com> wrote:
> The fact that the 'opt' table field reports spaces instead of '--' for
> IPv6 as it would have been the case with IPv4 has a bit of an
> unfortunate side effect that it completely confuses the 'jc' JSON
> formatter tool (which has an iptables formatter module).
> Consider:
>     # ip6tables -L test
>     Chain test (0 references)
>     target     prot opt source   destination
>     ACCEPT     all      a:b:c::  anywhere    MAC01:02:03:04:05:06
> 
> Then:
>     # ip6tables -L test | jc --iptables
>     [{"chain":"test",
>       "rules":[
>           {"target":"ACCEPT",
>            "prot":"all",
>            "opt":"a:b:c::",
>            "source":"anywhere",
>            "destination":"MAC01:02:03:04:05:06"
>           }]
>     }]
> 
> which as you can see is wrong simply because whitespaces are considered
> as a column delimiter.

Applied.  I amended the commit message to include a Link to this thread
on lore.kernel.org so in case something else breaks because of this
change.