From: Florian Westphal <fw@strlen.de>
To: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com>
Cc: netfilter-devel@vger.kernel.org, pablo@netfilter.org, fw@strlen.de
Subject: Re: [iptables PATCH v2 2/2] extensions: libxt_conntrack: print xlate status as set
Date: Tue, 30 Mar 2021 19:39:00 +0200 [thread overview]
Message-ID: <20210330173900.GB17285@breakpoint.cc> (raw)
In-Reply-To: <20210330141524.747259-2-alexander.mikhalitsyn@virtuozzo.com>
Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com> wrote:
> status_xlate_print function prints statusmask
> without { ... } around. But if ctstatus condition is
> negative, then we have to use { ... } after "!=" operator in nft
Not really.
> Reproducer:
> $ iptables -A INPUT -d 127.0.0.1/32 -p tcp -m conntrack ! --ctstatus expected,assured -j DROP
> $ nft list ruleset
> ...
> meta l4proto tcp ip daddr 127.0.0.1 ct status != expected,assured counter packets 0 bytes 0 drop
> ...
Yes, nft can't parse that.
But ct status { expect, assured } is NOT The same as 'ct status expect,assured'.
expect, assured etc. are all bit flags, so when negating this needs to be something
like 'ct status & (expected|assured) == 0'. (ct is neither expected nor assured).
next prev parent reply other threads:[~2021-03-30 17:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-30 14:15 [iptables PATCH v2 1/2] extensions: libxt_conntrack: print xlate state as set Alexander Mikhalitsyn
2021-03-30 14:15 ` [iptables PATCH v2 2/2] extensions: libxt_conntrack: print xlate status " Alexander Mikhalitsyn
2021-03-30 17:39 ` Florian Westphal [this message]
2021-03-30 18:05 ` Alexander Mikhalitsyn
2021-03-30 18:21 ` Florian Westphal
2021-03-31 10:31 ` Alexander Mikhalitsyn
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