tcp/ip stack in user space

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i want to move tcp/ip stack(including routing and
netfilter) to userspace, my goal is to trace all the
instructions involved in a firewall and router since i
don't know how to trace these instructions inside the
kernel. i want to get something like:

incoming ip packets(a file)-->fake ISR-->tcp/ip
stack-->outgoing ip packets( to /dev/null).

my question is: is it possible and relatively easy to
move tcp/ip stack to user space?

thanks for help.

X.Xiao

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• Next message: Alan Cox: "Re: [PATCH] fix ips driver compile problems"
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