Communication driver framework ?

[Brooks Davis]

On Thu, Jul 15, 2004 at 05:15:58PM +0100, Sifalakis, Manolis wrote:
> Hello all,
> 
> I am new to the list as well as "under the FreeBSD-hood" and this is my 
> first posting so pls forgive me if this has been asked 1000 times before 
> (I did not manage to find it in the archive).
> 
> We re planning to implement a programmable router framework for FreeBSD, 
> and basically we need to have a piece of code between the NIC driver(s) 
> and the protocol stack to pull out and push (back) in the forwarding 
> path network packets (and possibly do some low level routing among the 
> NIC interfaces there).
> 
> As a result I would like to ask if there is a communications driver 
> framework similar to NDIS -bleah- (in M$ Win) or STREAMS (in the -early- 
> ATT unix flavors), in FreeBSD. It would be significantly more efficient 
> and portable if we did not have to hard code in the kernel our 
> "intermediate" driver.

Netgraph can almost certaintly do what you want.  You'd probably
build a module that attached the per nic-module.  You might have to
implement per interface nodes if you need particular pseudo devices to
be supported, but that's not hard.

Here is a somewhat old article on netgraph:

http://www.daemonnews.org/200003/netgraph.html

The code for most netgraph modules lives under sys/netgraph.

-- Brooks

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