[Click] nsclick promiscuous interface

[Nicolas Letor]

Hello Bart,

It is a rather simple relation ( if I remember it correctly).
By enabling the promiscous mode of an interface, the interface will
install itself as a sniffer in the _tap variable in the MAC layer by
calling the installTap function.

When a packet is received in the MAC layer, the MAC layer will check
if there is a sniffer installed ( the if check on tap_ ) and if it
exists, send the packet to the sniffer (the tapping out). There are a
couple checks to avoid duplicating packets.

So what was the problem? Installing the tap was no problem, but in the
802.3 mac the packets where never send up to the sniffers.  They were
never tapped out.
If you look in the 802.11 mac, you will see that the packets are tapped out.

I hope you understand my explanation ;-)

Greetings,
Nicolas Letor
UA

On 6/3/05, Bart.Jooris <bart.jooris at intec.ugent.be> wrote:
> Hello Nicolas,
> 
> I added your patch and the sniffer works like a charm :)
> I would like to understand the code you added, I actually
> expected some kind of relation to the setpromiscus(promisc)
> in the mac/ll-ext.cc?
> 
> Thanks a lot,
> 
> Bart.
> 
> Nicolas Letor wrote:
> 
> >Hello ,
> >
> >The ns2 802_3 MAC doesnt send any packets to the host sniffers
> >(through to the tap). I fixed it by adding on line 302 of
> >mac/mac-802_3.cc the following:
> >
> ><      /* --- tap out     --- */
> ><      if (tap_ ){
> ><
> ><              if (!tap_filterown_ || ((dst != index_) && (dst != BCAST_ADDR))) {
> ><                      tap_->tap(p);
> ><              }
> ><
> ><      }
> ><      /* --- tap out end --- */
> >
> >Greetz,
> >Nicolas Letor
> >UA
> >
> >On 6/1/05, Bart.Jooris <bart.jooris at intec.ugent.be> wrote:
> >
> >
> >>Hello,
> >>
> >>Based on the information I found from Mike (November 2004 Archive) I added
> >>a sniffer to the simple wired lan example (nsclick tutorial by Michael Neufeld).
> >>
> >>This is the code of my Sniffer.click:
> >>
> >>  // Sniffer
> >>  //
> >>  FromSimDevice(eth0,4096) ->
> >>        ToDump(Sniffer)->
> >>        Discard;
> >>
> >>  Idle->
> >>        ToSimDevice(eth0);
> >>
> >>I inserted this code in the tcl script after the node generator for loop
> >>
> >>  set i 4
> >>
> >>  set node_($i) [$ns_ node]
> >>  $node_($i) add-wired-interface $chan_1_ $netll $netmac \
> >>          $netifq 1 $netphy
> >>*  $node_($i) setpromiscuous 0 1*
> >>  $node_($i) random-motion 0
> >>  $node_($i) topography $wtopo
> >>  $node_($i) nodetrace $tracefd
> >>  [$node_($i) set classifier_] setnodename "node$i­sniffer"
> >>  [$node_($i) entry] loadclick "Sniffer.click"
> >>
> >>
> >>After running the simple wired lan example I opened the
> >>Sniffer file with ethereal. There was only one entry, the arp broadcast :(
> >>
> >>any ideas on this?
> >>
> >>Thnx,
> >>
> >>Bart.
> >>
> >>
> >>
> >>Hello-
> >>You can do promiscuous mode in nsclick, you just have to enable it from
> >>the tcl part of your scripts. For example, to make eth0 go promiscuous:
> >>
> >>$node setpromiscuous 0 1
> >>
> >>-Mike
> >>
> >>
> >>
> >>Nicolas Letor wrote:
> >>
> >>
> >>>/ Hello,
> >>>
> >>>
> >>/>/
> >>/>/ In the nsclick user manual (p11) there is a  simple bridge example
> >>/>/ with the following click script.
> >>/>/ "
> >>/>/ FromSimDevice(eth0, 4096) -> Queue -> ToDump(eth0.txt) -> ToSimDevice(eth1);
> >>/>/ FromSimDevice(eth1, 4096) -> Queue -> ToDump(eth1.txt) -> ToSimDevice(eth0);
> >>/>/ "
> >>/>/
> >>/>/ I tried it out, but it doesn't work because the bridge can only
> >>/>/ forward packets who a broadcast address.  So I thought by enabling
> >>/>/ promiscous mode the bridge example.
> >>/>/
> >>/>/ Unfortunately nsclick's FromSimDevice doesn't support promiscous mode.
> >>/>/  Has anyone an idea to solve this problem of promiscous mode?
> >>/>/
> >>/>/ Thanks,
> >>/>/ Letor Nico/
> >>
> >>--
> >>Bart Jooris
> >>Department of Information Technology (INTEC)
> >>Gaston Crommenlaan 8 bus 201
> >>B-9050 Ledeberg
> >>
> >>Location:
> >>Complex Zuiderpoort - Blok C0 - Bureau 3.13
> >>
> >>
> >>
> >>_______________________________________________
> >>click mailing list
> >>click at amsterdam.lcs.mit.edu
> >>https://amsterdam.lcs.mit.edu/mailman/listinfo/click
> >>
> >>
> >>
> >
> >.
> >
> >
> >
> 
> 
> --
> Bart Jooris
> Department of Information Technology (INTEC)
> Gaston Crommenlaan 8 bus 201
> B-9050 Ledeberg
> 
> Location:
> Complex Zuiderpoort - Blok C0 - Bureau 3.13
> 
> E-mail: Bart.Jooris at intec.UGent.be
> Tel. +32 9 33 14.977
> Fax  +32 9 33 14.899
> Gsm  +32 474 59.53.42
> 
>