Re: [PATCH] Don't allow Managed DHCPv6 to short-circuit SLAAC

[Tore Anderson <tore fud no>]

* Dan Williams

> On Thu, 2011-08-11 at 00:41 +0200, Tore Anderson wrote:
>> Apologies, the patch appears to break real DHCPv6-only operation, i.e.,
>> when the Autonomous flag is unset for the Prefix Information Option(s)
>> contained in the RA.
>>
>> I will try to figure out how to avoid that and, if I manage to, will
>> post an updated version of the patch. (Do feel free to beat me to it,
>> though - I'm not at all familiar with the NetworkManager source code so
>> I am mostly stumbling around in the dark.)
> 
> Sure, feel free to ask questions.

I think NM needs to differentiate between the case when the RA is
indicating SLAAC should be used (i.e. when it contains a Prefix
Information with Autonomous=1), and when it doesn't. IPv6 addrconf (the
stateless kind) should only be done (and waited for) in the former case.
(Completely independent of DHCPv6 being used or not.)

I was thinking that a possible quick fix would be to set the device's
target state to got-ra if the RA received didn't contain any PIOs with
A=1 (since the got-address state seems to mean «SLAAC completed»), but
I'm stuck at figuring out how to determine if that is the case. From
what I can tell, the RA flags looks identical in both cases. Any
suggestions?

Best regards,
-- 
Tore Anderson