I have tried extending IOUserNetworkEthernet and calling RegisterEthernetInterface. This works perfectly for one ethernet interface, though the driver crashes when RegisterEthernetInterface is called a second time (doesn't return an error code). I have tried registering with separate queues.
Another approach was extending IOUserClient instead, and calling IOService::Create to create child IOUserNetworkEthernet instances. Everything about this approach works (the children appear within ioreg). However, once I call RegisterEthernetInterface on just one of the children, macOS crashes.
How would I go about creating a dext with multiple ethernet interfaces? Have I been approaching it the right way?
Thanks,
Jake
