LKM in 2.6 w/o the kernel source to intercept the IP packet and process in kernel sp
 

I am trying to create a kernel module to intercept the packet processing code to add some application specific details to the packet at kernel space. I looked at ip_local_delivery_finish in ip_input.c which delivers the packet to the other higher level protocols which I will be using. But with the kernel source code i could able to add a hook in the method and call the LKM.

But I would like to know if i can call ip_local_delivery_finish in my module after processing my application specific stuff ? Is this even possible without the kernel source ?

Thanks
K