linux-kernel - Re: [PATCH] netfilter: xt_NFLOG: allow 128 character log prefixes

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Message-ID: <20210727215240.GA25043@salvia>
Date:   Tue, 27 Jul 2021 23:52:40 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Alex Forster <aforster@...udflare.com>
Cc:     Kyle Bowman <kbowman@...udflare.com>,
        kernel-team <kernel-team@...udflare.com>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        linux-kernel@...r.kernel.org,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH] netfilter: xt_NFLOG: allow 128 character log prefixes

On Tue, Jul 27, 2021 at 04:44:42PM -0500, Alex Forster wrote:
> > I'm not refering to nftables, I'm refering to iptables-nft.
> 
> Possibly I'm misunderstanding. Here's a realistic-ish example of a
> rule we might install:
> 
>     iptables -A INPUT -d 11.22.33.44/32 -m bpf --bytecode "43,0 0 0
> 0,48 0 0 0,...sic..." -m statistic --mode random --probability 0.0001
> -j NFLOG --nflog-prefix "drop 10000 c37904a83b344404
> e4ec6050966d4d2f9952745de09d1308"
> 
> Is there a way to install such a rule with an nflog prefix that is >63 chars?

Yes, you can update iptables-nft to use nft_log instead of xt_LOG,
that requires no kernel upgrades and it will work with older kernels.