[libvirt] [PATCH] Add V6LOCAL parameter to nwfilter rules.

[Daniel P. Berrange]

On Wed, Apr 02, 2014 at 03:40:14PM -0400, Brian Rak wrote:
> @@ -163,6 +164,28 @@ virNWFilterVarHashmapAddStdValues(virNWFilterHashTablePtr table,
>                             "%s", _("Could not add variable 'MAC' to hashmap"));
>              return -1;
>          }
> +
> +        virMacAddr parsedMac;
> +        if (virMacAddrParse(macaddr, &parsedMac) == 0)
> +        {
> +            parsedMac.addr[0] ^= 2;
> +
> +            char euiMacAddr[26];
> +            snprintf(euiMacAddr, sizeof(euiMacAddr), "fe80::%x%x:%xff:fe%x:%x%x", parsedMac.addr[0], parsedMac.addr[1], parsedMac.addr[2],
> +                parsedMac.addr[3], parsedMac.addr[4], parsedMac.addr[5]);

Unfortunately this IPv6 addressing scheme isn't portable. Windows Vista
will create link local addresses which are completely random, not based
on the MAC address.

  http://technet.microsoft.com/en-us/magazine/2007.08.cableguy.aspx

I wonder if there's a way todo something more clever for IPv6 to learn
the addresses, we as do for IPv4 address learning, or snoop route
advertisment traffic as we do for DHCP


Regards,
Daniel
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