Robert Watson wrote:
On Fri, 23 Jun 2006, Johnny Choque wrote:
I'm interested in programming a virtual network device driver -Linux
concept- on a FreeBSD box. The idea behind of this sort of interface
is the following:
"From the kernel's point of view, a network interface is a software
object that can process outgoing packets, and the actual transmission
mechanism remains hidden inside the interface driver. Even though
most interfaces are associated to physical devices (or, for the
loopback interface, to a software-only data loop), it is possible to
design network interface drivers that rely on other interfaces to
perform actual packet transmission. The idea of a ``virtual''
interface can be useful to implement special-purpose processing on
data packets while avoiding to hack with the network subsystem of the
kernel."
I know that is not too complicated to program this sort of
functionality in linux but I would like to do it over freebsd, has
anybody some idea on how could I start doing it? I've been searching
in the freebsd handbook but I haven't found anything really relevant.
tap(4) and tun(4) describe pseudo-devices you can use to instantiate
ethernet and tunnel interfaces from user space. Programs attach to
pseudo-devices, and using read/write operations on the pseudo-device,
can receive and generate packets on the network interface. In kernel,
the ifnet(9) API is used to implement network interfaces -- nothing in
the API requires that the under-side of a network interface be
hardware. In fact, a great many network types without underlying
hardware have been implemented, including the loopback interface,
encapsulation interfaces, and the tap/tun interface
drivers.
there is also gif(4) as well
and if that is not enough the netgraph system gives you a toolkit to
make your own kernel based
virtual network interfaces.
(ng_iface, ng_ether, ng_eiface (and others))
Robert N M Watson
Computer Laboratory
University of Cambridge
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