Messages in this thread | | | Date | Sat, 07 May 2005 18:17:34 -0400 | From | "J. Scott Kasten" <> | Subject | Re: sending ICMP messages in kernel module |
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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-
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