Core3 no longer reuse netvm own IP for primary DNS. At the same time,
disable dropping traffic to netvm itself because it breaks DNS (as one
of blocked things). This allows VM to learn real netvm IP, but:
- this mechanism is not intended to avoid detection from already
compromised VM, only about unintentional leaks
- this can be prevented using vif-qubes-nat.sh on the netvm itself (so
it will also have hidden its own IP)
QubesOS/qubes-issues#1143
Since 'script' xenstore entry no longer allows passing arguments
(actually this always was a side effect, not intended behaviour), we
need to pass additional parameters some other way. Natural choice for
Qubes-specific script is to use QubesDB.
And since those parameters are passed some other way, it is no longer
necessary to keep it as separate script.
FixesQubesOS/qubes-issues#1143
Apparently even iptables-restore does not handle concurrent firewall
updates. This is especially a problem in case of HVM, which have two
network interfaces (one through stubom and the other direct) added at
the same time.
The later one is present only in latest iptables version - especially
debian does not have it. But we need to handle "Device or resources
busy" problem somehow.
vif-route-qubes can be called simultaneously, for example in case of:
- multiple domains startup
- HVM startup (two interfaces: one to the target domain, second one to
stubdom)
If that happens, one of calls can fail because of iptables lock.
