Playing with Network Stack

Greetings,

I hoping someone here can help point me in the right direction. I had an
idea for project, but I lack some of the know how. I was wonder if it might
be possible to have a kernel module or an application that can inspect
and mangle a packet before it gets routed? I don't want to just sniff the
traffic. I want to be able to look at the packet and then hand it back to
the network stack for processing. If so is there some reading or example
code I could look at?


Thanks in advance,

-James
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