netdev - Re: Advice on user space application integration with tc

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Message-ID: <CAM_iQpWnxTuHQfXzxQ6Cg5Ec=D7yJQsvw+3WpnzDuDXAUow7fg@mail.gmail.com>
Date:   Mon, 15 May 2017 13:14:54 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Morgan Yang <morgan.yang1982@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Advice on user space application integration with tc

On Thu, May 11, 2017 at 1:45 PM, Morgan Yang <morgan.yang1982@...il.com> wrote:
> Hi All:
>
> I want to build a solution that leverages the filtering and actions of
> tc in kernel space, but have the ability to hook  to a userspace
> application that can additional packet processing (such as payload
> masking). I'm curious what are the best ways to go about doing that? I
> have been looking into tc-skbmod and tc-pedit, but as good as they
> are, they would require newer kernels. I have also tried using tc to
> mirror filterd packets to a dummy or tap interface, and have the
> userspace application pick up there, but the performance has been
> supar. I'm hoping to have a solution that avoids the extra mirroring.


act pedit exists for a rather long time, I don't think you need a new
kernel to use it, unless of course you have a different definition of
"new kernel". ;)