netdev - Re: Hooking on L4 Level with process information

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Message-ID: <20170828201900.625a10ed@xeon-e3>
Date:   Mon, 28 Aug 2017 20:19:00 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Ravish Kumar <ravishk2004@...il.com>
Cc:     Networking <netdev@...r.kernel.org>
Subject: Re: Hooking on L4 Level with process information

On Tue, 29 Aug 2017 07:34:51 +0530
Ravish Kumar <ravishk2004@...il.com> wrote:

> Hi,
> 
> I want to hook tcp/udp packets on L4 Layer and based on process
> information , content want to deny or allow packets.
> 
> Netfilter provides pre/post Routing hooks but not sure that will be
> right place so thought of asking whether my approach is right.
> Also how i can get process information whether this packet is send by
> this process.
> 
> Thoughts /source code reference would be appreciated.
> 
> Regards,
> Ravish

There is not a 1:1 relationship between sockets/files and processes.