Example network protocol implementation

[Vishal Patil]

Would like to thank you all folks. These conversations are really good way
of learning things...Also it is good to know different perspectives for
solving the same problem....

On 12/10/06, Julian Elischer <julian at elischer.org> wrote:
>
> Özkan KIRIK wrote:
> > I think netgraph subsystem provides this infrastructure for implementing
> > new protocols.
> >
> > according to netgraph (4) man page:
> >
> >    The aim of *netgraph* is to supplement rather than replace the
> existing
> >     kernel networking infrastructure.    It provides:
> >
> >     *·*     A flexible way of combining protocol and link level drivers.
> >     *·*     A modular way to implement new protocols.
> >     *·*     A common framework for kernel entities to inter-communicate.
> >     *·*     A reasonably fast, kernel-based implementation.
> >
> > There are many examples and applications at this address:
> > http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netgraph/
>
> also look it up in the daemon news archives at:
> http://ezine.daemonnews.org/200003/netgraph.html
>
> a little out of date but the basic ideas are still right.
>
>
> >
> >
> > you implementation may be "ng_iscsi" :)
>
> I thought of this but the trick is to do with the locking..
> You would need to get a transfer of control from the
> netgraph locking domain to the geom or scsi universe's locking domain.
>
> There are all the components needed if you consider using the ksocket
> netgraph node to open a TCP socket within the kernel, and you could hook
> that to a scsi device netgraph node almost directly if you wrote it,
> but the hardest part will be to create a method of crossing that locking
> divide.
>
> Still it's possibly worth looking at. Of course the method suggested by
> Warner is also very valid and may be about the same amount of work.
>
>
> >
> > I hope this helps,
> >
> > Özkan KIRIK
> > EnderUNIX SDT @ Turkey
> > Software Developer
> >
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