dhcp client usage

[Per Hallsmark <per hallsmark t2data se>]

Hello,

I'm adding functionality to NM in order to support a broadband module.

The hw module has a cdc-acm interface which I send AT command stuff to and
in the end, a cdc-ether interface is created. So far so god, I use the 
nm_device_set_ip_iface()
in order to specify where the IP traffic should go (at least this is my 
assumption :-) )
so iface is ttyACM0 and ip_iface is mb0 in my case. Next step is to do a 
DHCP
request session on the ip_iface in order to fetch ip, gw and dns's.
Unfortunally though in nm-device.c, the routines that handles dhcp uses 
iface
and not ip_iface so here it fails for the moment.

If I let my cdc-acm interface (which is a bit similar to 
nm-hso-gsm-device.c|h,
but yet not) return ok for ip config, I get the nice antenna icon and 
interface is
believed to be up.
Thereafter I can manually start dhclient on the ethernet interface and 
all is ok.

But howto make NM do this for me? Shouldn't really the dhcp routines in 
nm-device
use the ip_iface instead of iface? (guess this will break stuff a bit 
until it is fixed
by having all interfaces specify ip_iface even though it could be same 
as iface in some places)

Please enlighten me a bit in the NM architecture for the dhcp stuff here :-)

Thanks and best regards,
Per