[Ns-developers] Linking ns-3 with openflow

[Ruben Merz]

Hi Josh,

For ns-3 and Click, I believe we have a similar setup. Click is built as 
a .so file (libnsclick.so) that gets linked to ns-3. You might look into it.

R

On 3/10/11 15:47 , Josh Pelkey wrote:
> Mathieu, these functions are declared and defined outside of ns-3,
> contained in the source of the "openflow-mpls" project. Blake created
> a wscript within this project to build these functions into a library.
> Within ns-3, there is an interface to this openflow-mpls project. It
> includes the openflow.h header from the linked library and uses
> several of those functions there to interface with openflow in ns-3.
> I know there are details missing in this description, but I hope that
> answers your questions ok.
>
> Lalith, I always forget about build/config.log. I'm about to start
> working on this again today and will look there for some ideas.
> Thanks!
>
> --
> Josh
>
> On Thu, Mar 10, 2011 at 5:37 AM, Lalith Suresh<suresh.lalith at gmail.com>  wrote:
>> Hello Josh,
>>
>> On Wed, Mar 9, 2011 at 10:06 PM, Josh Pelkey<jpelkey at gatech.edu>  wrote:
>>> Hi all,
>>>
>>> Blake's ns-3-openflow code links an outside static library called
>>> libopenflow.a to ns-3. Everything seems to build just fine, including
>>> ns-3 files and examples that use openflow specific functions, but at
>>> the very end I get this:
>>>
>>> debug/libns3.so: undefined reference to `set_vlan_pcp'
>>> debug/libns3.so: undefined reference to `set_dl_addr'
>>> debug/libns3.so: undefined reference to `ofp_logdir'
>>> debug/libns3.so: undefined reference to `retrieve_buffer'
>>> debug/libns3.so: undefined reference to `discard_buffer'
>>> debug/libns3.so: undefined reference to `set_tp_port'
>>> debug/libns3.so: undefined reference to `set_mpls_exp'
>>> debug/libns3.so: undefined reference to `strip_vlan'
>>> debug/libns3.so: undefined reference to `set_mpls_label'
>>> debug/libns3.so: undefined reference to `set_vlan_vid'
>>> debug/libns3.so: undefined reference to `set_nw_addr'
>>> debug/libns3.so: undefined reference to `ofp_rundir'
>>> collect2: ld returned 1 exit status
>>>
>>> I thought this might be waf/wscript related, but I just spent hours
>>> doing basically trial and error, and I didn't get any farther. I also
>>> thought it might have to do with the fact that I'm trying to link a
>>> static library, so I tried to build openflow as a shared library, but
>>> then ./waf configure refused to see the library -- even though it was
>>> there. So then I thought that might have to do with the
>>> "conf.check(fragment=...)" within the openflow wscript, but I really
>>> have no idea where to start with that. Obviously, I'm kind of lost
>>> when it comes to this waf/wscript/libraries thing. Does anybody have
>>> any thoughts or suggestions? Below is a link to the wscript used to
>>> link openflow, as well as the wscript which is used outside of ns-3 to
>>> create the static library in the stand-alone openflow source:
>>>
>>> http://code.nsnam.org/bhurd/ns-3-openflow/file/c8e9530fcbdb/src/devices/switch/wscript
>>> <--- This basically follows what ns-3-click did for its wscript
>>> http://code.nsnam.org/bhurd/ns-3-openflow/file/c8e9530fcbdb/src/devices/switch/openflow/wscript
>>
>> What does build/config.log tell you?
>>
>>>
>>> Thanks for any help.
>>>
>>> --
>>> Josh Pelkey
>>>
>>
>>
>>
>> --
>> Lalith Suresh
>> Department of Computer Science and Engineering
>> Instituto Superior Técnico
>> www.lalith.in
>>
>