netdev - Hooking on L4 Level with process information

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Date:   Tue, 29 Aug 2017 07:34:51 +0530
From:   Ravish Kumar <ravishk2004@...il.com>
To:     Networking <netdev@...r.kernel.org>
Subject: Hooking on L4 Level with process information

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