Re: [PATCH 00/26] IPVS: Add first IPv6 support to IPVS.

To: Julius Volz <juliusv@xxxxxxxxxx>
Subject: Re: [PATCH 00/26] IPVS: Add first IPv6 support to IPVS.
Cc: Patrick McHardy <kaber@xxxxxxxxx>, Vince Busam <vbusam@xxxxxxxxxx>, Ben Greear <greearb@xxxxxxxxxxxxxxx>, lvs-devel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Fri, 13 Jun 2008 16:26:23 +1000
On Thu, Jun 12, 2008 at 09:33:27PM +0200, Julius Volz wrote:
> On Thu, Jun 12, 2008, Patrick McHardy <kaber@xxxxxxxxx> wrote:
> > Julius Volz wrote:
> >> Ah, that's what I thought... Are there any simple kernel examples with
> >> userspace counterparts to look at? I know iproute2 uses netlink, but
> >> it seems like a rather complicated example.
> >
> > For nfnetlink: net/netfilter/nf_conntrack_netlink.c and
> > libnfnetlink_conntrack from
> Thanks!
> >> Genetlink seems especially nice, although I couldn't find a general
> >> explanation of it other than in git history.
> >
> > I don't have an example for genetlink, but I guess you should
> > find some in libnl. In this case I guess both would be fine
> > since ipvs is only loosely tied to the rest of netfilter.
> Ok, my first impression is that genetlink is aimed at being simple to
> use (and has a nice howto).
> So we'll work on a genetlink interface and some of the other v6 patch
> issues and then post again in a while. Thanks for the feedback!
> Horms: ping if you're interested or have some good ideas for this.

Julius: pong

The main two problems that I see in the existing interface are
a) lack of extendibility (which is why we are here) and;
b) non-idempotent actions, especially adding and deleting
   real servers, which mean that user-space programs that
   manipulate ipvsadm have have extra (racy) logic.
   (ok, perhaps that is more a pet peeve than a problem).

I don't really have any concrete ideas about what a better
interface would look like. But I am more than happy to hash our ideas.


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