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
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