[libvirt-users] nwfilter and address of network ip address

[Daniel P. Berrange]

On Mon, May 08, 2017 at 11:30:46AM -0400, Nicolas Bock wrote:
> On Mon, May 08, 2017 at 03:35:19PM +0100, Daniel P. Berrange wrote:
> > On Sat, May 06, 2017 at 08:09:49PM -0400, Dan wrote:
> > > On Fri, May 5, 2017 at 4:29 PM, Nicolas Bock <nicolasbock at gmail.com> wrote:
> > > 
> > > > Hi,
> > > >
> > > > I am running a webserver on the libvirt host and would like to add a
> > > > nwfilter such that a VM can access that server. The corresponding iptables
> > > > rule would look like this:
> > > >
> > > > iptables --append INPUT --in-interface virbr0 --destination 192.168.122.1
> > > > --protocol tcp --dport 80 --jump ACCEPT
> > > >
> > > > where the network is using virbr0 and sits at 192.168.122.1. I don't want
> > > > to hardcode the host IP address in the nwfilter so that I can use that
> > > > filter for other networks. Is it possible to reference the host's IP
> > > > address in the filter?
> > 
> > There is a pre-defined parameter for the VM's own IP address:
> > 
> >  http://libvirt.org/formatnwfilter.html#nwfelemsRulesAdvIPAddrDetection
> > 
> > but we don't have anything for the host's IP address. We could fairly
> > easily add it though I reckon - eg provide a HOST_IP parameter.
> 
> Thanks Daniel.

BTW, please don't misinterpret this to mean i'm going to actually implement
this myself. I mostly meant a) file a RFE bug report against libvirt's
upstream bug tracker b)  if you feel motivated to look at it, you could
try writing a patch for libvirt and submit it :-)

Regards,
Daniel
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