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

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Message-ID: <f4845fc0806111205j36c912d3vf1b632a3d0777a1c@mail.gmail.com>
Date:	Wed, 11 Jun 2008 21:05:57 +0200
From:	"Julius Volz" <juliusv@...gle.com>
To:	"Patrick McHardy" <kaber@...sh.net>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 00/26] IPVS: Add first IPv6 support to IPVS.

On Wed, Jun 11, 2008 at 8:42 PM, Patrick McHardy <kaber@...sh.net> 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.

Julius

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