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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.

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Ian Wienand d9ee51ef46 network: Only check kernel added routes in virNetDevIPCheckIPv6Forwarding The original motivation for adding virNetDevIPCheckIPv6Forwarding (commit `00d28a78b5`) was that networking routes would disappear when ipv6 forwarding was enabled for an interface. This is a fairly undocumented side-effect of the "accept_ra" sysctl for an interface. 1 means the interface will accept_ra's if not forwarding, 2 means always accept_RAs; but it is not explained that enabling forwarding when accept_ra==1 will also clear any kernel RA assigned routes, very likely breaking your networking. The check to warn about this currently uses netlink to go through all the routes and then look at the accept_ra status of the interfaces. However, it has been noticed that this problem does not affect systems where IPv6 RA configuration is handled in userspace, e.g. via tools such as NetworkManager. In this case, the error message from libvirt is spurious, and modifying the forwarding state will not affect the RA state or disable your networking. If you refer to the function rt6_purge_dflt_routers() in the kernel, we can see that the routes being purged are only those with the kernel's RTF_ADDRCONF flag set; that is, routes added by the kernel's RA handling. Why does it do this? I think this is a Linux implementation decision; it has always been like that and there are some comments suggesting that it is because a router should be statically configured, rather than accepting external configurations. The solution implemented here is to convert the existing check into a walk of /proc/net/ipv6_route (because RTF_ADDRCONF is apparently not exposed in netlink) and look for routes with this flag set. We then check the accept_ra status for the interface, and if enabling forwarding would break things raise an error. This should hopefully avoid "interactive" users, who are likely to be using NetworkManager and the like, having false warnings when enabling IPv6, but retain the error check for users relying on kernel-based IPv6 interface auto-configuration. Signed-off-by: Ian Wienand <iwienand@redhat.com> Reviewed-by: Laine Stump <laine@redhat.com> Reviewed-by: Cedric Bosdonnat <CBosdonnat@suse.com>		2020-09-13 13:35:05 -04:00
.ctags.d	maint: Add support for .ctags.d	2019-05-31 17:54:28 +02:00
.github	github: skip lockdown of old issues/prs	2020-04-07 17:50:54 +01:00
build-aux	remote: introduce virt-ssh-helper binary	2020-09-09 16:46:22 +01:00
ci	Add FreeBSD 11.4 CI job on Cirrus	2020-09-10 13:11:46 +01:00
docs	docs: virsh: Drop duplicate spelling for dompmwakeup	2020-09-12 12:49:32 +02:00
examples	examples: Use GLib event loop impl in events.stp	2020-08-21 11:34:23 +01:00
include	qemu: Allow NBD migration over UNIX socket	2020-09-04 10:20:49 +02:00
po	remote: introduce virt-ssh-helper binary	2020-09-09 16:46:22 +01:00
scripts	libvirt: add stateShutdownPrepare/stateShutdownWait to drivers	2020-09-07 09:33:58 +03:00
src	network: Only check kernel added routes in virNetDevIPCheckIPv6Forwarding	2020-09-13 13:35:05 -04:00
tests	tests: Use glib memory functions in pci_driver_new	2020-09-11 18:19:59 +02:00
tools	virsh: pool-list: options --all and --inactive are mutually exclusive	2020-09-12 12:49:32 +02:00
.color_coded.in	gnulib: delete all gnulib integration	2020-02-07 15:03:54 +00:00
.ctags	ctags: Generate tags for headers, i.e. function prototypes	2018-09-18 14:21:33 +02:00
.dir-locals.el	build: avoid tabs that failed syntax-check	2012-09-06 09:43:46 -06:00
.editorconfig	Add .editorconfig	2019-09-06 12:47:46 +02:00
.gitignore	Ignore clangd-related files and folders	2020-08-03 10:57:47 +02:00
.gitlab-ci.yml	Add FreeBSD 11.4 CI job on Cirrus	2020-09-10 13:11:46 +01:00
.gitmodules	gnulib: delete all gnulib integration	2020-02-07 15:03:54 +00:00
.gitpublish	gitpublish: add a subject prefix	2020-01-16 13:04:11 +00:00
.mailmap	mailmap: Remove some duplicates	2019-06-07 13:18:08 +02:00
.ycm_extra_conf.py.in	gnulib: delete all gnulib integration	2020-02-07 15:03:54 +00:00
AUTHORS.rst.in	AUTHORS: Remove Emacs file variables	2020-09-02 13:20:17 +02:00
config.h	config.h: add a copyright blurb	2020-08-03 13:54:15 +02:00
configmake.h.in	meson: generate configmake.h	2020-08-03 09:26:48 +02:00
CONTRIBUTING.rst	meson: adjust our documentation to mention meson instead of autoconf	2020-08-03 09:27:09 +02:00
COPYING	maint: follow recommended practice for using LGPL	2013-05-20 14:15:21 -06:00
COPYING.LESSER	maint: Remove control characters from LGPL license file	2015-09-25 09:16:24 +02:00
gitdm.config	gitdm: add 'ibm' file	2019-10-18 17:32:52 +02:00
libvirt-admin.pc.in	Add libvirt-admin library	2015-06-16 13:46:20 +02:00
libvirt-lxc.pc.in	Add pkg-config files for libvirt-qemu & libvirt-lxc	2014-06-23 16:17:27 +01:00
libvirt-qemu.pc.in	Add pkg-config files for libvirt-qemu & libvirt-lxc	2014-06-23 16:17:27 +01:00
libvirt.pc.in	Add pkg-config files for libvirt-qemu & libvirt-lxc	2014-06-23 16:17:27 +01:00
libvirt.spec.in	remote: introduce virt-ssh-helper binary	2020-09-09 16:46:22 +01:00
meson_options.txt	qemu: Check for changes in qemu modules directory	2020-09-01 14:22:24 -06:00
meson.build	virnuma: Assume numa_bitmask_isbitset() exists	2020-09-11 13:57:21 +02:00
mingw-libvirt.spec.in	spec: Require Fedora 31	2020-06-17 12:59:08 +02:00
NEWS.rst	Revert "news: qemu: Support TLS for NBD connections for pull mode backup"	2020-09-08 08:05:23 +02:00
README.rst	README: drop Travis CI badge	2020-08-03 15:08:28 +02:00
run.in	Prefer https: everywhere where possible	2020-09-01 21:58:46 +02:00

README.rst

Libvirt API for virtualization

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:

https://libvirt.org

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:

libvirt-users@redhat.com (for user discussions)
libvir-list@redhat.com (for development only)

Further details on contacting the project are available on the website:

https://libvirt.org/contact.html