Ragnar Lonn wrote:
Julian Elischer wrote:
Ragnar Lonn wrote:
Hello all,
Does anyone know if virtual network stack support (as implemented at
http://www.tel.fer.hr/zec/vimage/) is on the roadmap for future FreeBSD releases?
that depends on who you are talking to :-)
the problems are not with the concept of virtual network stacks
but with how you make them virtual and still support loadable modules and protocols.
It is theoretically possible but it requires that there be an infrastructure to allow
loadble modules to link into and out of exisiting virtual worlds.
What Marco did is very good but it is limited to those modules that are compiled in in
that manner.
I would like to do it but the scope just keeps growing when you look into what it
would require.
Especially in 5.x/6.x where the emphasis has been in making more and more of
the system loadable.
Ok, here is a dumb question!
Would it be possible to have multiple network stack support available as a kernel
compile option that, if enabled, disabled other functionality that conflicted with it?
I would guess that few people need to have multiple network stacks on their
systems and that those who do might be able to accept the loss of other
functionality to get this feature.
/Ragnar
It would be pretty hard, though you MIGHT be able to do funny linker tricks.
the way that teh virtual stacks is done is that all the global variables etc. that the netwirk stacks
use are moved into one big structure. then places that access those variables are changed to
read them from the structure instance that is currently active.
interfaces and process structures have a pointer to one of these structures (indirectly),
so that is how th e correct one to use is looked up.
It works well but it's not vaery extensible because you would have to keep changing the
structure when you added or deleted modules.. (
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