i am a final year IT student, doing a project in linux networking...

i want to intercept the packet transmission before it enters TCP by inserting my own module so that my module gets executed whenever a packet is transmitted.In my module i want to display the contents or simply access the packet.My module should also be able to return the packet to the TCP-IP code of the kernel.

In short i just want to interrupt the transmission of a packet through TCP-IP.

If your intent is read-only, then simply use the tcpdump command, or you own code with the interface in permissive mode.

Hey, i didnt understand what do you mean by "own code with the interface in permissive mode"...

But i want to intercept the transmission every time and not just once...

Thus i want to write a module which will check for the packet transmission continuousely... and whenever it will encounter one it will print the packet contents(at the stage before entering the TCP IP code in the kernel).

And i am not able to poll for the packet transmission through the module..i just dont know how to do it(Is it possible to do something like this through a module?), because i dont want to do any changes in the kernel code.

Please help me with this.