netdev - Re: interface information for recvd packet

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Message-ID: <CANX6Dan5bdA-3wSiyAaQmOV6DHArxjknUFpR-s8coA9Yjx2N8A@mail.gmail.com>
Date:	Thu, 1 Sep 2011 15:40:12 -0400
From:	Viral Mehta <viral.vkm@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: interface information for recvd packet

On Tue, Aug 30, 2011 at 11:55 AM, Viral Mehta <viral.vkm@...il.com> wrote:
>
> Hi,
>
> I was trying to implement following thing,
>
> 1. I wanted to know whenever packet received for particular socket, I
> want to know which network interface actually received it ?

My objective is still the same..

> 2. I was looking at net/ipv4/tcp.c and in function tcp_recvmsg(); I am
> trying to get interface name by accessing sk_buff->dev->name

I tried printing address of SKBs, but it gives different address in
NIC driver and tcp.c
My understanding is, struct sk_buff* remains same through out all
layers i.e., NIC driver allocates it after receving frame
and same is passed till TCP layer. But, apparently looks I am wrong
from the prints that I have put.

Can someone shed some light ?

>    However, it gives me (null). I have made sure that in my ethernet
> (NIC) driver, I filled up that information before doing netif_rx().
>
> So, the question is,
> Is this information Trimmed out at some upper layer ??
>

--
Thanks,
Viral Mehta
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