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: lvs-devel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx
From: Patrick McHardy <kaber@xxxxxxxxx>
Date: Wed, 11 Jun 2008 21:10:54 +0200
Julius Volz wrote:
On Wed, Jun 11, 2008 at 8:42 PM, Patrick McHardy <kaber@xxxxxxxxx> wrote:
Julius Volz wrote:
Another question I was unsure about: is the breaking of the
userspace-to-kernel interface even acceptable at all? I think the code
would get ugly (and have even more duplication) if you wanted to keep
the backwards compatibility. And you have to compile ipvsadm for your
kernel version anyways.
Usually its not acceptable. Why do you have compile ipvsadm
for specific kernel versions?

ipvsadm uses get/set-sockopts on a raw socket to pass commands and
structs (as defined in include/net/ip_vs.h) to the kernel. So the
passed structs have to match exactly between userspace and kernel. The
kernel ip_vs.h also includes a version number that is used to verify
that ipvsadm matches your kernel version.

So they define an ABI, which means they must not be changed in
incompabtible ways. The question is whether they are actually
changed in incomaptible ways.

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