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

[Pablo Neira Ayuso]

On Tue, Jul 27, 2021 at 03:06:05PM -0500, Alex Forster wrote:
> (And again, this time as plain-text...)
> 
> > Why do you need to make the two consistent? iptables NFLOG prefix
> > length is a subset of nftables log action, this is sufficient for the
> > iptables-nft layer. I might be missing the use-case on your side,
> > could you please elaborate?
> 
> We use the nflog prefix space to attach various bits of metadata to
> iptables and nftables rules that are dynamically generated and
> installed on our edge. 63 printable chars is a bit too tight to fit
> everything that we need, so we're running this patch internally and
> are looking to upstream it.

It should be possible to update iptables-nft to use nft_log from
userspace (instead of xt_LOG) which removes this limitation, there is
no need for a kernel upgrade.