If IPv6 is configured in the VM, and it is providing network to others,
apply IPv6 firewall similar to the IPv4 one (including NAT for outgoing
traffix), instead of blocking everything. Also, enable IP forwarding for
IPv6 in such a case.
FixesQubesOS/qubes-issues#718
For a long time the DNS address was the same as default gateway. This is
still the case in R3.x, but using `qubes-gateway` configuration
parameter for it is misleading. It should be up to dom0 to provide DNS
address (whether the value is the same as gateway or not).
FixesQubesOS/qubes-issues#1817
* Check whether sysctl is accessible
* Check whether a key which exists when CONFIG_MODULES=y is not accessible
If true, CONFIG_MODULES=n, so ignore modprobe failure.
If false, fail.
Get rid of underscores in filenames, use dashes instead.
This is first part of cleanup in filenames.
"qubes_rpc" still untouched - will be in separate commit.