From: "J. Scott Kasten" <jscottkasten@yahoo.com>
To: rajat swarup <rajats@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: sending ICMP messages in kernel module
Date: Sat, 07 May 2005 18:17:34 -0400 [thread overview]
Message-ID: <427D3E7E.2020405@yahoo.com> (raw)
In-Reply-To: <7d04ec5605050622006f3ad56c@mail.gmail.com>
rajat swarup wrote:
>Hi,
>I have placed a netfilter hook in which I grab the packets in the
>pre-routing stage.
>I need to send ICMP messages in response to certain messages in this hook.
>I looked at alloc_skb(), skb_reserve() and skb_put() functions but it
>is still not clear to me as to how to construct the packets using
>these methods.
>Since I am getting the packets in the Pre-routing stage should I
>explicitly construct the MAC header, IP header & data & ICMP message?
>Also, I'll need to calculate the checksum to be transmitted in the
>ICMP packet...which method could I use to do that?
>
>
Hello,
I had a similar problem once. In the icmp.c file, look at how the ping
echo reply works. That is as close to a tutorial as you will find in
the code. I think you might find it strait forward from there.
-Scott-
next prev parent reply other threads:[~2005-05-07 22:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-07 5:00 rajat swarup
2005-05-07 22:17 ` J. Scott Kasten [this message]
2005-05-07 23:39 ` rajat swarup
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