Re: [RTnet-developers] multicast support

[Jan K. <ki...@rt...>]

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.
> 

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.

Jan