[Click] The architecture of click

[Yongheng Qi]

Dear everyone:

The Click project is the base of our project,  the test source is running in
linux userlevel, In the final product, I want to click run in the linux
kernel.

I read some does about the click kernel mode, and try it. but some quesiton
I can't understand:

why FromDevice can  both running kernel mode and userlevel mode?

In the userlevel, I can use the KernelTun element, in the kernel mode, which
element can replace the kernelTun element?

Thanks very much.



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