Re: [RTnet-developers] multicast support

[Amine El h. <am...@an...>]

Hi jan;

> What about  rt_ip_route_output()? Doesn't it exactly do what you need? It
> fills a dest_route structure which then contains a pointer to the output
> rtdev. Take a look at rt_udp_sendmsg() for a usage example.
That's ok,   rt_ip_route_output() give a pointer to the output rtdev , but 
only in the case when we add the multicast adress to route table :
# rtroute add 239.0.0.2 01:00:5e:00:00:01 dev rteth0 , that work well,
But in the case of multicat, we can calculate the mac address  from the IP 
address  without using routing table.
So i have added a conditions test before the call of the 
"rt_ip_route_output()" in udp_sendmsg function
if the dist address is multicast  i calculate the mac adresse and i locate the 
rtdev by the local address (saddr).

So nowday Im able to recive and send mulicast packets with rtnet .Im testing 
it now and i will send you  a first realise of my patch soon.
PS : i have only enabled the multicast support for the two NICs ,8139too et 
e100.


Amine

> Hi Amine,
>
> sorry for the late reply.
>
> >>What are you actually planning? Likely there is a different way to
> >>achieve it
> >
> > TO send an IGMP request to join a multicast goup ,the only information i
> > had is the rt_socket ,and i need to send directly the igmp packet without
> > passing by the ip level , that mean to use directly the xmit_start
> > function ,to use it i need rtnet_device pointer. you see the problem i
> > had ?
> > So I have resolved the problem by adding a new function in "rtdev.c", its
> > role is to get rtnet_device by local_ip  adress.it work well. The only
> > constrain that we must specify the local ip adress when using multicast.
>



>
> Jan
>
>
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