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qemu: log error on attempts to set filterref on an OVS-connected interface

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ebtables/iptables processing is skipped for any interface connected to
Open vSwitch (they have their own packet filtering), likewise for
midonet (according to
http://blog.midokura.com/2016/04/midonet-rule-chains), but libvirt
would allow adding a <filterref> to interfaces connected in these
ways, so the user might mistakenly believe they were being protected.

This patch checks for a non-NULL <virtualport> element for an
interface (or its network) and logs an error if <virtualport> and
<filterref> are both present. This could cause some previously working
domains to no longer start, but that's really the whole point of this
patch - to warn people that their filterref isn't protecting them as
they might have thought.

I don't bother checking this during post-parse validation, because
such a check would be incomplete - it's possible that a network would
have a <virtualport> that would be applied to an interface, and you
can't know that until the domain is started.

Resolves: https://bugzilla.redhat.com/1502754
This commit is contained in:
Laine Stump 2017-12-12 16:18:07 -05:00
parent b21163bd11
commit 16a9a28129
1 changed files with 19 additions and 9 deletions
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28
src/qemu/qemu_command.c
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@ -8545,15 +8545,25 @@ qemuBuildInterfaceCommandLine(virQEMUDriverPtr driver,
}
/* and only TAP devices support nwfilter rules */
if (net->filter &&
!(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
actualType == VIR_DOMAIN_NET_TYPE_ETHERNET)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("filterref is not supported for "
"network interfaces of type %s"),
virDomainNetTypeToString(actualType));
return -1;
if (net->filter) {
virNetDevVPortProfilePtr vport = virDomainNetGetActualVirtPortProfile(net);
if (!(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
actualType == VIR_DOMAIN_NET_TYPE_ETHERNET)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("filterref is not supported for "
"network interfaces of type %s"),
virDomainNetTypeToString(actualType));
return -1;
}
if (vport && vport->virtPortType != VIR_NETDEV_VPORT_PROFILE_NONE) {
/* currently none of the defined virtualport types support iptables */
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("filterref is not supported for "
"network interfaces with virtualport type %s"),
virNetDevVPortTypeToString(vport->virtPortType));
return -1;
}
}
if (net->backend.tap &&