netdev - Re: Hooking on L4 Level with process information

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Message-ID: <CAEDnJm+_15jKc25WqYH62PGuyfNLjcCqv5CHc0HpYdsS-U7Mfw@mail.gmail.com>
Date:   Tue, 29 Aug 2017 09:06:37 +0530
From:   Ravish Kumar <ravishk2004@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Networking <netdev@...r.kernel.org>
Subject: Re: Hooking on L4 Level with process information

Not convinced with this .

A process open a socket and that socket is associated with that
particular process unless it shares the file descriptors.
Can you explain why it is not related , at a time a socket will be
opened by a particular process.

On Tue, Aug 29, 2017 at 8:49 AM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> 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.