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Laszlo Ersek 51e184e982 bridge driver: don't masquerade local subnet broadcast/multicast packets 
Packets sent by guests on virbrN, *or* by dnsmasq on the same, to
- 255.255.255.255/32 (netmask-independent local network broadcast
  address), or to
- 224.0.0.0/24 (local subnetwork multicast range)
are never forwarded, hence it is not necessary to masquerade them.

In fact we must not masquerade them: translating their source addresses or
source ports (where applicable) may confuse receivers on virbrN.

One example is the DHCP client in OVMF (= UEFI firmware for virtual
machines):

  http://thread.gmane.org/gmane.comp.bios.tianocore.devel/1506/focus=2640

It expects DHCP replies to arrive from remote source port 67. Even though
dnsmasq conforms to that, the destination address (255.255.255.255) and
the source address (eg. 192.168.122.1) in the reply allow the UDP
masquerading rule to match, which rewrites the source port to or above
1024. This prevents the DHCP client in OVMF from accepting the packet.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=709418

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
 		2013-09-25 08:31:50 -04:00
.gnulib@4a5ee89c8a maint: update to latest gnulib 2013-09-24 06:53:07 -06:00
build-aux Add API for calling systemd-machined's DBus API 2013-07-22 13:09:58 +01:00
daemon virConnectGetCPUModelNames: implement the remote protocol 2013-09-23 15:50:35 -06:00
docs docs: Load libvirt_access*.xml from build dir 2013-09-23 14:16:45 +02:00
examples build: only install nwfilter examples when building nwfilter 2013-09-04 13:48:27 -06:00
gnulib build: enforce makefile conditional style 2013-09-04 09:40:20 -06:00
include libvirt: add new public API virConnectGetCPUModelNames 2013-09-23 15:41:50 -06:00
m4 maint: update to latest gnulib 2013-09-24 06:53:07 -06:00
po libxl: Introduce libxl_domain.[ch] 2013-09-03 16:43:20 -06:00
python python: add bindings for virConnectGetCPUModelNames 2013-09-23 16:59:39 -06:00
src bridge driver: don't masquerade local subnet broadcast/multicast packets 2013-09-25 08:31:50 -04:00
tests Fix format specifier for OOM test fprintfs 2013-09-24 16:56:53 +01:00
tools virsh: add function to get the CPU models for an arch 2013-09-23 16:42:10 -06:00
.ctags maint: Make ctags work out of the box 2013-07-18 08:47:21 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore VMware: Make version parsing testable and add tests 2013-09-20 08:23:31 -05:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
AUTHORS.in Add John Ferlan to the committers list 2013-02-05 10:59:32 -05:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
ChangeLog-old docs, comments: minor typo fixes 2013-09-10 17:06:41 -06:00
HACKING docs: mention VIR_TEST_RANGE 2013-08-12 20:44:41 -06:00
Makefile.am build: ensure 'make check' sees up-to-date config.h 2013-09-23 15:18:24 -06:00
Makefile.nonreentrant maint: use LGPL correctly 2013-05-20 14:03:48 -06:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00
autobuild.sh build: make autobuild require rpm build deps 2013-09-16 09:35:05 -06:00
autogen.sh autogen.sh: Correctly detect .git as a file 2013-08-29 13:19:45 +02:00
bootstrap maint: update to latest gnulib 2013-09-24 06:53:07 -06:00
bootstrap.conf maint: avoid bootstrap warning 2013-08-15 16:54:06 -06:00
cfg.mk Add test case for virNetServerClient object identity code 2013-09-24 09:37:26 +01:00
configure.ac Add support for using 3-arg pkcheck syntax for process (CVE-2013-4311) 2013-09-18 15:13:42 +01:00
libvirt.pc.in Add missing 'libvirt_lxc_api' variable in pkg-config file 2013-09-04 14:52:40 +01:00
libvirt.spec.in Add support for using 3-arg pkcheck syntax for process (CVE-2013-4311) 2013-09-18 15:13:42 +01:00
mingw-libvirt.spec.in build: add configure option to disable gnulib tests 2013-08-12 10:02:38 -06:00
run.in run: license as LGPL 2013-02-23 14:03:19 -07:00

README 

         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>