[RTnet-developers] Patch for multicast support for RTnet

[amine <am...@an...>]

hi ,

Here the first realise of patch for multicast support in RTnet , This realise 
support :
* IGMP V2

I have only adapt the NIC drivers for :
*RT_8139too  : Tested
*RT_eepro100  : Not Tested

-HOW TO USE IT ;
     1- Apply the patch to rtnet : (0.8.1 - 0.8.2 - 0.8.3)
     2- Patch the NIC driver 
     3- Execute the autogen.sh scritp to generate a new configure file. (a new    
config option will added "--enable-multicast" )
     4-execute configure   "./configure --with-rtai=<RTAI-DIR> 
--enable-multicast "

Now in your application if you want to receive multicast packets  you must use 
setsockopt  " RT_IP_ADD_MEMBERSHIP " , to stop the reception of multicast 
packet you can use "RT_IP_DROP_MEMBERSHIP"

Don't forget when sending multicast packet to specify the local IP adress,  
don't use INADDR_ANY (Only way I've fount to locate the device) .

for more detail about use of multicast in RTNET please see the sample attached 
to this mail.

I hope if any body can test this patch ,and if you have any idea to improve 
it. 

Im working now on a new realize of this patch , I will  add :
* the possiblity to modify the TLL value( new IOCTL in the socketopt).
* IGMP V1 Support.
* A random response to the query request (IGMP  V1 & V2).



-- 
EL HEDADI Amine
R&D 
phone : 
Email : am...@an...