Source examples of io-net packet filter module?

The documentation with 6.2 has some example code for writing a nic device driver io-net module. I’d like to write an io-net module that sits above the nic driver level, like a packet filter. Does anyone know where I can find some example source for writing this type of an io-net module at this point in the stack?

You should be able to get the source from one of xtang’s examples.