netdev - Re: [PATCH RFC 00/24] IPVS: Add first IPv6 support to IPVS

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Message-ID: <f4845fc0808210259n2b4bbd41tb0a93c49592a2029@mail.gmail.com>
Date:	Thu, 21 Aug 2008 11:59:44 +0200
From:	"Julius Volz" <juliusv@...gle.com>
To:	"Simon Horman" <horms@...ge.net.au>
Cc:	netdev@...r.kernel.org, lvs-devel@...r.kernel.org, kaber@...sh.net,
	vbusam@...gle.com, "Sven Wegener" <sven.wegener@...aler.net>
Subject: Re: [PATCH RFC 00/24] IPVS: Add first IPv6 support to IPVS

On Thu, Aug 21, 2008 at 3:17 AM, Simon Horman <horms@...ge.net.au> wrote:
> On Wed, Aug 20, 2008 at 06:15:07PM +0200, Julius Volz wrote:
>> What is not supported with IPv6:
>> - handling fragmentation or other extension headers
>> - FTP application helper (can be loaded, but only operates on v4)
>> - sync daemon (can be started, but only operates on v4)
>
> Other than the packet format of the sync deamon, are there any
> fundamental restrictions here? If we extended the sync daemon,
> could it work? If so, perhaps we could rev the sync deamon protocol
> and fix a few other kinks, like the handling of timeouts and the
> general lack of extendability, at the same time.

There shouldn't be any fundamental restrictions, it's just a piece of
the puzzle that I could easily leave out of the picture for now.

I haven't studied the sync daemon closely yet, but one thing I was
briefly wondering about was whether we should just blow up the
addresses in struct ip_vs_sync_conn to be of type union nf_inet_addr
(probably not acceptable, wasting too much bandwidth for v4 entries)
or how to send differently sized entries based on the IP version in a
clean way. But it sounds like you'd want to redesign a lot of that
anyways? I'm glad to help with anything, I just don't know this code
as well as you or Sven, but I'll study it more. Maybe you can share
some ideas on the extensibility you want to see?

>> Thanks for any comments!
>
> Unfortunately (or fortunately depending on how you look at it),
> I'm going to be away skiing for the next couple of days. Apologies
> for the slow responses that will lead to.

Have fun! And be careful, we need you to come back healthy :)

Julius

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