Take a look at NetworkExtension filter packet providers (
NEFilterPacketHandlercallback is given both the interface (via the
interfaceparameter) and the link-level header (at the start of the buffer pointed to be
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
Thanks a lot, eskimo.