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

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Date:   Mon, 15 May 2017 13:39:27 -0700
From:   Morgan Yang <morgan.yang1982@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Advice on user space application integration with tc

I tried on both stock CentOS 7.3 and Ubuntu 16.04 and tc-skbmod was
not support (I built tc from the latest versions of iproute2). For
tc-pedit, examples from man tc-pedit such as "pedit ex munge" were not
supported, but "pedit munge offset" is.

On Mon, May 15, 2017 at 1:14 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> 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". ;)