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

[Patrick McHardy <kaber@xxxxxxxxx>]

Julius Volz wrote:
> On Wed, Jun 11, 2008 at 9:10 PM, Patrick McHardy <kaber@xxxxxxxxx> wrote:
>   
> > Julius Volz wrote:
> >     
> > > 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.
> >     
> It is clearly laid out to be able to be changed over time, hence the
> ipvsadm version check... 
The usual way is to add new members at the end. The history shows no
changes at all to these structs though.

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