afbd1bb89e
The iptables backend (which was used as the model for the nftables backend) used the same "filter" and "nat" tables used by other services on the system (e.g. firewalld or any other host firewall management application), so it was possible that one of those other services would be blocking DNS, DHCP, or TFTP from guests to the host; we added our own rules at the beginning of the chain to allow this traffic no matter if someone else rejected it later. But with nftables, each service uses their own table, and all traffic must be acepted by all tables no matter what - it's not possible for us to just insert a higher priority/earlier rule that will override some reject rule put in by, e.g., firewalld. Instead the firewalld (or other) table must be setup by that service to allow the traffic. That, along with the fact that our table is already "accept by default", makes it possible to eliminate the individual accept rules for DHCP, DNS, and TFTP. And once those rules are eliminated, there is no longer any need for the guest_to_host or host_to_guest tables. Signed-off-by: Laine Stump <laine@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Libvirt API for virtualization
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.
Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.
Further information about the libvirt project can be found on the website:
License
The libvirt C API is distributed under the terms of GNU Lesser General Public License, version 2.1 (or later). Some parts of the code that are not part of the C library may have the more restrictive GNU General Public License, version 2.0 (or later). See the files COPYING.LESSER and COPYING for full license terms & conditions.
Installation
Instructions on building and installing libvirt can be found on the website:
https://libvirt.org/compiling.html
Contributing
The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:
https://libvirt.org/contribute.html
Contact
The libvirt project has two primary mailing lists:
- users@lists.libvirt.org (for user discussions)
- devel@lists.libvirt.org (for development only)
Further details on contacting the project are available on the website: