Re: [libvirt] [PATCH v3 01/36] network: restrict usage of port management APIs

The port allocation APIs are currently called unconditionally for all types of NIC, but (mostly) only do anything for NICs with type=network. The exception is the port allocate API which does some validation even for NICs with type!=network. Relying on this validation is flawed, however, since the network driver may not even be installed. IOW virt drivers must not delegate validation to the network driver for NICs with type != network. This change allows us to report errors when the virtual network driver is not registered.

Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- src/conf/domain_conf.c | 26 ++++++++------ src/libxl/libxl_domain.c | 6 ++-- src/libxl/libxl_driver.c | 9 +++-- src/lxc/lxc_driver.c | 6 ++-- src/lxc/lxc_process.c | 9 +++-- src/network/bridge_driver.c | 72 +++++++++++++++++++------------------ src/qemu/qemu_driver.c | 6 ++-- src/qemu/qemu_hotplug.c | 17 +++++---- src/qemu/qemu_process.c | 9 +++-- 9 files changed, 94 insertions(+), 66 deletions(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 504c24b545..b7bb94b90b 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -30187,13 +30187,11 @@ int virDomainNetAllocateActualDevice(virDomainDefPtr dom, virDomainNetDefPtr iface) { - /* Just silently ignore if network driver isn't present. If something - * has tried to use a NIC with type=network, other code will already - * cause an error. This ensures type=bridge doesn't break when - * network driver is compiled out. - */ - if (!netAllocate) - return 0; + if (!netAllocate) { + virReportError(VIR_ERR_NO_SUPPORT, "%s", + _("Virtual networking driver is not available")); + return -1; + } return netAllocate(dom, iface); } @@ -30223,8 +30221,11 @@ bool virDomainNetBandwidthChangeAllowed(virDomainNetDefPtr iface, virNetDevBandwidthPtr newBandwidth) { - if (!netBandwidthChangeAllowed) - return 0; + if (!netBandwidthChangeAllowed) { + virReportError(VIR_ERR_NO_SUPPORT, "%s", + _("Virtual networking driver is not available")); + return -1; + } return netBandwidthChangeAllowed(iface, newBandwidth); } @@ -30233,8 +30234,11 @@ int virDomainNetBandwidthUpdate(virDomainNetDefPtr iface, virNetDevBandwidthPtr newBandwidth) { - if (!netBandwidthUpdate) - return 0; + if (!netBandwidthUpdate) { + virReportError(VIR_ERR_NO_SUPPORT, "%s", + _("Virtual networking driver is not available")); + return -1; + } return netBandwidthUpdate(iface, newBandwidth); } diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c index 287406d323..e2f1b54210 100644 --- a/src/libxl/libxl_domain.c +++ b/src/libxl/libxl_domain.c @@ -903,7 +903,8 @@ libxlDomainCleanup(libxlDriverPrivatePtr driver, /* cleanup actual device */ virDomainNetRemoveHostdev(vm->def, net); - virDomainNetReleaseActualDevice(vm->def, net); + if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK) + virDomainNetReleaseActualDevice(vm->def, net); } } @@ -1060,7 +1061,8 @@ libxlNetworkPrepareDevices(virDomainDefPtr def) * network's pool of devices, or resolve bridge device name * to the one defined in the network definition. */ - if (virDomainNetAllocateActualDevice(def, net) < 0) + if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK && + virDomainNetAllocateActualDevice(def, net) < 0) return -1; actualType = virDomainNetGetActualType(net); diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c index a9edc8211d..d5cd3fc834 100644 --- a/src/libxl/libxl_driver.c +++ b/src/libxl/libxl_driver.c @@ -3390,7 +3390,8 @@ libxlDomainAttachNetDevice(libxlDriverPrivatePtr driver, * network's pool of devices, or resolve bridge device name * to the one defined in the network definition. */ - if (virDomainNetAllocateActualDevice(vm->def, net) < 0) + if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK && + virDomainNetAllocateActualDevice(vm->def, net) < 0) goto cleanup; actualType = virDomainNetGetActualType(net); @@ -3440,7 +3441,8 @@ libxlDomainAttachNetDevice(libxlDriverPrivatePtr driver, vm->def->nets[vm->def->nnets++] = net; } else { virDomainNetRemoveHostdev(vm->def, net); - virDomainNetReleaseActualDevice(vm->def, net); + if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK) + virDomainNetReleaseActualDevice(vm->def, net); } virObjectUnref(cfg); return ret; @@ -3863,7 +3865,8 @@ libxlDomainDetachNetDevice(libxlDriverPrivatePtr driver, cleanup: libxl_device_nic_dispose(&nic); if (!ret) { - virDomainNetReleaseActualDevice(vm->def, detach); + if (detach->type == VIR_DOMAIN_NET_TYPE_NETWORK) + virDomainNetReleaseActualDevice(vm->def, detach); virDomainNetRemove(vm->def, detachidx); } virObjectUnref(cfg); diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c index e981f8e901..027c4fd990 100644 --- a/src/lxc/lxc_driver.c +++ b/src/lxc/lxc_driver.c @@ -3834,7 +3834,8 @@ lxcDomainAttachDeviceNetLive(virConnectPtr conn, * network's pool of devices, or resolve bridge device name * to the one defined in the network definition. */ - if (virDomainNetAllocateActualDevice(vm->def, net) < 0) + if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK && + virDomainNetAllocateActualDevice(vm->def, net) < 0) return -1; actualType = virDomainNetGetActualType(net); @@ -4388,7 +4389,8 @@ lxcDomainDetachDeviceNetLive(virDomainObjPtr vm, ret = 0; cleanup: if (!ret) { - virDomainNetReleaseActualDevice(vm->def, detach); + if (detach->type == VIR_DOMAIN_NET_TYPE_NETWORK) + virDomainNetReleaseActualDevice(vm->def, detach); virDomainNetRemove(vm->def, detachidx); virDomainNetDefFree(detach); } diff --git a/src/lxc/lxc_process.c b/src/lxc/lxc_process.c index e0729a24bf..7849aaf5b9 100644 --- a/src/lxc/lxc_process.c +++ b/src/lxc/lxc_process.c @@ -224,7 +224,8 @@ static void virLXCProcessCleanup(virLXCDriverPtr driver, iface->ifname)); ignore_value(virNetDevVethDelete(iface->ifname)); } - virDomainNetReleaseActualDevice(vm->def, iface); + if (iface->type == VIR_DOMAIN_NET_TYPE_NETWORK) + virDomainNetReleaseActualDevice(vm->def, iface); } virDomainConfVMNWFilterTeardown(vm); @@ -558,7 +559,8 @@ static int virLXCProcessSetupInterfaces(virConnectPtr conn, if (virLXCProcessValidateInterface(net) < 0) goto cleanup; - if (virDomainNetAllocateActualDevice(def, net) < 0) + if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK && + virDomainNetAllocateActualDevice(def, net) < 0) goto cleanup; type = virDomainNetGetActualType(net); @@ -637,7 +639,8 @@ static int virLXCProcessSetupInterfaces(virConnectPtr conn, ignore_value(virNetDevOpenvswitchRemovePort( virDomainNetGetActualBridgeName(iface), iface->ifname)); - virDomainNetReleaseActualDevice(def, iface); + if (iface->type == VIR_DOMAIN_NET_TYPE_NETWORK) + virDomainNetReleaseActualDevice(def, iface); } } return ret; diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c index 4d4ab0f375..cf37a16c64 100644 --- a/src/network/bridge_driver.c +++ b/src/network/bridge_driver.c @@ -4371,8 +4371,11 @@ networkAllocateActualDevice(virDomainDefPtr dom, size_t i; int ret = -1; - if (iface->type != VIR_DOMAIN_NET_TYPE_NETWORK) - goto validate; + if (iface->type != VIR_DOMAIN_NET_TYPE_NETWORK) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Expected a interface for a virtual network")); + goto error; + } virDomainActualNetDefFree(iface->data.network.actual); iface->data.network.actual = NULL; @@ -4691,7 +4694,6 @@ networkAllocateActualDevice(virDomainDefPtr dom, if (virNetDevVPortProfileCheckComplete(virtport, true) < 0) goto error; - validate: /* make sure that everything now specified for the device is * actually supported on this type of network. NB: network, * netdev, and iface->data.network.actual may all be NULL. @@ -4710,19 +4712,11 @@ networkAllocateActualDevice(virDomainDefPtr dom, (actualType == VIR_DOMAIN_NET_TYPE_BRIDGE && virtport && virtport->virtPortType == VIR_NETDEV_VPORT_PROFILE_OPENVSWITCH))) { - if (netdef) { - virReportError(VIR_ERR_CONFIG_UNSUPPORTED, - _("an interface connecting to network '%s' " - "is requesting a vlan tag, but that is not " - "supported for this type of network"), - netdef->name); - } else { - virReportError(VIR_ERR_CONFIG_UNSUPPORTED, - _("an interface of type '%s' " - "is requesting a vlan tag, but that is not " - "supported for this type of connection"), - virDomainNetTypeToString(iface->type)); - } + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("an interface connecting to network '%s' " + "is requesting a vlan tag, but that is not " + "supported for this type of network"), + netdef->name); goto error; } }

@@ -4738,22 +4732,20 @@ networkAllocateActualDevice(virDomainDefPtr dom, } } - if (netdef) { - netdef->connections++; + netdef->connections++; + if (dev) + dev->connections++; + /* finally we can call the 'plugged' hook script if any */ + if (networkRunHook(obj, dom, iface, + VIR_HOOK_NETWORK_OP_IFACE_PLUGGED, + VIR_HOOK_SUBOP_BEGIN) < 0) { + /* adjust for failure */ + netdef->connections--; if (dev) - dev->connections++; - /* finally we can call the 'plugged' hook script if any */ - if (networkRunHook(obj, dom, iface, - VIR_HOOK_NETWORK_OP_IFACE_PLUGGED, - VIR_HOOK_SUBOP_BEGIN) < 0) { - /* adjust for failure */ - netdef->connections--; - if (dev) - dev->connections--; - goto error; - } - networkLogAllocation(netdef, actualType, dev, iface, true); + dev->connections--; + goto error; } + networkLogAllocation(netdef, actualType, dev, iface, true);