Hello! I'm new to the list, and what I've found in the list archives regarding packet injection is somewhat lacking in detail. What I want to do: I want to write a tool that sends and receives packets within the kernel context. It's generates traffic on one interface and receives the result of some blackbox modification to it on another interface. So I need both packet filtering / netfilter like capabilities and packet injection capabilities. While the way to go for the receiving end of the application is pretty straightforward, my question is: How to inject packets inside the kernel? One idea was to create the packets externally, store them in kernel RAM, and use netfilter hooks to inject them. The injection would be done by a linux kernel module or rather by a periodic tasklet registered by that module. Can you comment whether this is a feasible approach? Or could you come up with a better one, that fulfills the requirement of being in-kernel? Thanks and with kind regards, Oliver Korpilla
