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xen-devel
Re: [Xen-devel] [PATCH]: xl: use libuuid to generate random UUID's
On Thu, 5 Aug 2010, Vincent Hanquez wrote:
> On 05/08/10 03:19, Ian Pratt wrote:
> >> Link to libuuid in xl et al and bring in the header file. Use libuuid to
> >> generate UUID's which are actually UU and not merely pseudo-random :)
> >>
> >> As a side-effect I have also used libuuid to generate more random MAC
> >> addresses rather than keeping the old code and simply xoring getpid() in
> >> to the PRNG seed.
> >
> > The MAC generation scheme in xend was awful -- it might be a good idea to
> > take this opportunity to fix things in libxl.
> >
> > The best approach is to generate locally administered MAC addresses hence
> > giving us 46 bits of freedom rather than XenSource registered OUI addresses
> > which have just 24 bits -- collisions will be *much* less likely. Further,
> > it's best not to generate random addresses every time, but to derive the
> > MAC address from a good hash of the VM UUID and the NIC number so that they
> > are deterministic.
>
> Adding some details here...
>
> In general it would be a good idea to recopy already *existing* schemes
> (unless it can be proven to be the wrong thing to do) already available
> in XCP and XCI into libxl, instead of reinventing new square wheels like
> here. (although this square wheel is in xl not in libxl actually)
>
> The MAC generation, as the one Ian mentioned, is already available in
> the XCI toolstack and in the XCP toolstack (the code there is a bit more
> scattered so i'ld recommend reading the XCI one).
>
since you seem to know exactly where the code is, would you like to
submit a patch for that? ;)
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