[libvirt] [PATCH] network: verify proper address family in updates to <host> and <range>

Ján Tomko jtomko at redhat.com
Thu Jan 22 08:47:59 UTC 2015

On 01/19/2015 11:04 PM, Laine Stump wrote:
> By specifying parentIndex in a call to virNetworkUpdate(), it was
> possible to direct libvirt to add a dhcp range or static host of a
> non-matching address family to the <dhcp> element of an <ip>. For
> example, given:
>  <ip address='' netmask=''/>
>  <ip family='ipv6' address='2001:db6:ca3:45::1' prefix='64'/>
> you could provide a static host entry with an IPv4 address, and
> specify that it be added to the 2nd <ip> element (index 1):
>   virsh net-update default add ip-dhcp-host --parent-index 1 \
>   '<host mac="52:54:00:00:00:01" ip=""/>'
> This would be happily added with no error (and no concern of any
> possible future consequences).
> This patch checks that any dhcp range or host element being added to a
> network ip's <dhcp> subelement has addresses of the same family as the
> ip element they are being added to.
> This problem was noticed when looking at the reproduction case for
> https://bugzilla.redhat.com/show_bug.cgi?id=1182486 (but is not a
> solution to that bug).
> ---
>  src/conf/network_conf.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)


Although it would be nicer if we could also find the correct <dhcp> element
matching the address when --parent-index is not specified. With the ipv4
<dhcp> section first I get an error trying to add an ipv6 host:

virsh net-update default add-first ip-dhcp-host ipv6.xml
error: Failed to update network default
error: Requested operation is not valid: the address family of a host entry IP
must match the address family of the dhcp element's parent


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