netdev - Re: multicasting netlink messages to groups

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Message-Id: <1183719232.3818.109.camel@johannes.berg>
Date:	Fri, 06 Jul 2007 12:53:52 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	netdev <netdev@...r.kernel.org>, jamal <hadi@...erus.ca>,
	Thomas Graf <tgraf@...g.ch>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: multicasting netlink messages to groups > 31 from userspace

On Thu, 2007-07-05 at 15:37 +0200, Patrick McHardy wrote:

> Earlier filtering makes sense, especially for userspace. The other
> part exceeds my wireless knowledge :)

No worries. I'll see if I can come up with a way to do earlier
filtering, but it's not actually required for the functionality. And the
discussion in the wireless realm still isn't over.

> > No actually having that hook means I can do without multicast groups by
> > just publishing that "send configuration requests to pid N" where N is
> > either 0 (in-kernel MLME) or something else (userspace MLME); I just
> > didn't know the hook existed.
> 
> 
> Even better. Publishing that to userspace is going to be racy though.

I could instead have userspace always send message to 0 and just
redirect them to the userspace process if present; will have to look
into it. That wouldn't be racy at least, but I think this race is going
to be the least of your worries (if the userspace MLME just died then
you have to completely re-do all configuration anyway, and if it just
started the same)

> The genetlink stuff defintely makes sense. I'll have a closer look at
> your patches this weekend.

Thanks. I know Zhang Rui will definitely appreciate that too :)

johannes

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