[uml-devel] 802.11 emulation under UML

[uml-devel] 802.11 emulation under UML

[maria maria]

Hi!
I want to make a module based off the net daemon that
has wireless extensions.
The first thing I need to do is to make an uml
wireless daemon that simulates 802.11 protocol
(CSMA/CA: to send RTS, CTS, ACK for each packet, to
run a backoff algorithm 
to realize collision avoidance, etc...).
I would like to know where in the uml switch code is
the best place to do that.
I'm really looking for some help with uml switch
because it is pretty undocumented... I think I need to
add some set from inside uml, but I really don't know
how to do...I'm pretty new to linux.....
Can someone help me?
Thank you in advance!

Maria


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Re: [uml-devel] 802.11 emulation under UML

[Felix Müri]

maria maria wrote:
> Hi!
> I want to make a module based off the net daemon that
> has wireless extensions.
> The first thing I need to do is to make an uml
> wireless daemon that simulates 802.11 protocol
> (CSMA/CA: to send RTS, CTS, ACK for each packet, to
> run a backoff algorithm 
> to realize collision avoidance, etc...).
> I would like to know where in the uml switch code is
> the best place to do that.
> I'm really looking for some help with uml switch
> because it is pretty undocumented...
uml_switch uses the interface for routing ethernet packets which has 
noting to do with device drivers (the standard tun device driver is used).
I wouldn't say, that uml switch is badly documented. The code is 
straight forward and well written (I had to understand it to program my 
replacement uml_switch2 (http://www.uxu.ch/uxu/software/uml_switch2)

I fear, you need to replace the daemon uml-networkadapter with something 
more powerful. By the way, Jeff has some ideas for additional changes in 
the uml-networkadapter that you could implement too ;-)

Regards, Felix

I think I need to
> add some set from inside uml, but I really don't know
> how to do...I'm pretty new to linux.....
> Can someone help me?
> Thank you in advance!
> 
> Maria
> 
> 
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> 
> 
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Re: [uml-devel] 802.11 emulation under UML

[Michael Richardson]

-----BEGIN PGP SIGNED MESSAGE-----


Maria, I have been proposing to write a new network back end for
UML that does full 802.11, including beacons, station attachment, and
flow control.

This would be a "wlanX" equivalent in UML - hostapd being the base
for the top parts, and the uml_switch-replacement + new backend
doing the functions which typically are done by the 802.11 firmware
itself.

uml_switch can't help you.

It isn't a trivial undertaking, and I have been seeking funding
for it. I have two partial funders for this work.

- --
]       ON HUMILITY: to err is human. To moo, bovine.           |  firewalls  [
]   Michael Richardson,    Xelerance Corporation, Ottawa, ON    |net architect[
] mcr@xelerance.com      http://www.sandelman.ottawa.on.ca/mcr/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [
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