Hello ,

I need to create a new ICMP type of packet to suite my project need. But i am unable to find the existing packet formats in Linux source where i can add my new type. Does any one know how to add that?

I'm not sure what your trying to do. You want to add your custom icmp between two machines? Make icmp2 , the next general protocol in fact

General tip:
I use cscope for browsing the kernel, you should install it, its very small and pretty effective
then in /usr/src/linux (kernel source tree or whereever it is):
cscope -R, it will make a crossreference of the kernel
then you can make a search ("find this text string")

for example:
ICMP_ECHO
This is the simplest ICMP (its payload is exactly what was received)
You should have a line
You should also have a look at ICMP_ECHO_REPLY for the response.
Go on this line, hit enter, and look how it is done. Exit csope with CtrlD
Make your own, rebuild your kernel (you can't have tcp/ip as a module). Try

Hope its what you want to do.

Thanx for the information. But i am kind looking for somthing different. I have to use ICMP packet in my modules to get things work. I will be installing my patch to every machine under test. So u can say icmp2. But for that i need the existing implementation of the ICMP packets structure. So referring that i can add my code there. Reply...