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

[Patrick McHardy <kaber@xxxxxxxxx>]

Julius Volz wrote:
> On Thu, Jun 12, 2008 at 3:38 PM, Patrick McHardy <kaber@xxxxxxxxx> wrote:
> > Julius Volz wrote:
> > > > I wonder if now would be a good time to bite the bullet and design
> > > > a new interface that is extendable.
> > > If we really have to break it once for IPv6 anyways, it seems like a
> > > good opportunity. Depends on how invasive the changes would need to
> > > be, of course...
> > You don't need to break the old interface, just add an additional
> > one.
> Ok, then we will just keep the old one in parallel for some time.
>
> > > You probably already have some ideas on what a better interface would
> > > look like? Especially, how to design it for future backwards
> > > compatibility? And would it still use sockopts or rather one of the
> > > other communication mechanisms?
> > I'd suggest genetlink or nfnetlink.
> 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 git.netfilter.org.

> 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.
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