I am creating a port of a Win32 NDIS intermediate driver. The main
task I am currently working on is bytes reservation. Consider the
following task - I need to reserve some bytes in every packet - even
when it's filled up to MTU so I can insert additional special bytes
from the driver. In Windows I do so by changing MTU for all upper
layer drivers so they see driver MTU minus let's say 28 bytes which I
grab for myself. I need to solve the same task on Mac, however I see
that there is no special means to switch MTU per-layer but only
globally. However still I need somehow to force all upper NKE's and
stack to believe that MTU is 28 bytes less but network card driver
itself should treat such packets as O.K.
I will dig into the kernel but may be there is a known way to do so.
Thanks in advance. Just in case NKE I am working on is an interface
filter - I need to work on packets after fragmentation and I need to
access link layer info.
Best regards,
Stauff__
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