netdev - Re: [PATCH 00/30] Netfilter/IPVS updates for net-next

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Message-Id: <20180312.160119.1610465393660409111.davem@davemloft.net>
Date:   Mon, 12 Mar 2018 16:01:19 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     nbd@....name
Cc:     pablo@...filter.org, netfilter-devel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 00/30] Netfilter/IPVS updates for net-next

From: Felix Fietkau <nbd@....name>
Date: Mon, 12 Mar 2018 20:30:01 +0100

> It's not dead and useless. In its current state, it has a software fast
> path that significantly improves nftables routing/NAT throughput,
> especially on embedded devices.
> On some devices, I've seen "only" 20% throughput improvement (along with
> CPU usage reduction), on others it's quite a bit lot more. This is
> without any extra drivers or patches aside from what's posted.

I wonder if this software fast path has the exploitability problems that
things like the ipv4 routing cache and the per-cpu flow cache both had.
And the reason for which both were removed.

I don't see how you can avoid this problem.

I'm willing to be shown otherwise :-)