protected bool AllIaPrefixesOnLink(DhcpV6IaPdOption dhcpIaPdOption, DhcpLink clientLink)
{
bool onLink = true;
// assume all IPs are on link
if ((dhcpIaPdOption != null))
{
List <DhcpV6IaPrefixOption> iaPrefixOpts = dhcpIaPdOption.GetIaPrefixOptions();
if ((iaPrefixOpts != null))
{
foreach (DhcpV6IaPrefixOption iaPrefixOpt in iaPrefixOpts)
{
if (this.clientLink.GetSubnet().GetSubnetAddress().IsIPv6LinkLocal)
{
// if the Link address is link-local, then check if the
// address is within one of the pools configured for this
// local Link, which automatically makes this server
// "authoritative" (in ISC parlance) for this local net
v6PrefixPool p = DhcpServerConfiguration.FindPrefixPool(this.clientLink.GetLink(), iaPrefixOpt.GetInetAddress());
if ((p == null))
{
log.Info(("No local prefix pool found for requested IA_PD: "
+ (iaPrefixOpt.GetInetAddress().ToString() + " - considered to be off link")));
iaPrefixOpt.SetPreferredLifetime(0);
iaPrefixOpt.SetValidLifetime(0);
onLink = false;
}
}
else if (!this.clientLink.GetSubnet().Contains(iaPrefixOpt.GetInetAddress()))
{
log.Info(("Setting zero(0) lifetimes for off link prefix: " + iaPrefixOpt.GetInetAddress().ToString()));
iaPrefixOpt.SetPreferredLifetime(0);
iaPrefixOpt.SetValidLifetime(0);
onLink = false;
}
}
}
}
return(onLink);
}