Tom Judge wrote:
Thanks for the response. I have a quick grep of the src tree to find
an example of this being used and only found the following from
wpa_supplicant and I have a few questions:
* I am presuming that this will do what I want, am I correct?
Yes, it will attempt to add the given link layer multicast group to the
ifnet's underlying device driver.
* If I was only ever to add the address to an interface an never
delete it would this cause any problems? I.e. when lldpd ends, or is
restarted and tries to add the address again?
SIOCADDMULTI is very low level, no resource tracking is performed; I
changed its semantics to only allow one userland opener so that
in-kernel refcounting would work, as there is no per-process or
per-client resource tracking -- so it's a really good idea to clean up
after it.
* Alternatively is there a way to query the filter to ask what
addresses it is currently programmed for?
Nope, there is no userland or kernel API for that unless you hack up the
driver.
cheers
BMS
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