Re: Thinking about IPv6 and DEPRECATED addresses

On Wednesday 28 February 2007 09:47, Randall Stewart wrote:
All:

I have been deep in the middle of breaking SCTP's dependencies on
looking at ifa structures...

One of the problems I have run in to is that V6 has this
additional set of flags:
ifa6->ia6_flags

And it can have things like:
IN6_IFF_DEPRECATED
IN6_IFF_DETACHED
IN6_IFF_ANYCAST
IN6_IFF_NOTREADY

Now obviously if you have a deprecated or detached address
you probably do not want to use them.. nor do you want to
use a "NOTREADY" since I think that means that DAD has not
finished...

So, I am contemplating adding to rtsock.c the ability to
send these types of events up. I am thinking on adding
this there for two reasons..

a) SCTP already hooks into the routing socket to get
interface changes.
and

b) It may well be a relevant fact that if an address becomes
DETACHED or non-DETACHED (etc) for a routing process
to want to know about..


What do others think? If I am off in the weeds somewhere and
this does not concern the routing socket I could use other
methods .. including isolating the "look at the state" flags
into a special place so that proper locking could be added
when we actually do locking for the ifa's... of course I would
prefer just not to have to look at it :-D

Opinions if this is a good idea or not??

Great idea. I'm also CC-ing Tsuyoshi MOMOSE who is working on importing
MIP6 which will likely be interested in this information (in userland) as
well. AFAIK, the mnd already listens on the rtsock to pick up new
addresses as soon as possible, but not sooner (for which it has to go
through great lengths).

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