Move some global variables in more appropriate places.
Move some global variables in more appropriate places.

Add XXX comments to mark places which need to be taken care of
if we want to remove this part of the kernel from Giant.

Add a comment on a potential performance problem with ip_forward()

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase