[libvirt] [PATCH 07/10] libxl: prevent attaching multiple netdevs with the same MAC
It will not be possible to detach such device later. Also improve
logging in such cases.
Signed-off-by: Marek Marczykowski-Górecki <marmarek(a)invisiblethingslab.com>
---
src/libxl/libxl_driver.c | 41 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 39 insertions(+), 2 deletions(-)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index ce3a99b..005cc96 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -2787,6 +2787,7 @@ libxlDomainAttachNetDevice(libxlDriverPrivatePtr driver,
int actualType;
libxl_device_nic nic;
int ret = -1;
+ char mac[VIR_MAC_STRING_BUFLEN];
/* preallocate new slot for device */
if (VIR_REALLOC_N(vm->def->nets, vm->def->nnets + 1) < 0)
@@ -2801,6 +2802,14 @@ libxlDomainAttachNetDevice(libxlDriverPrivatePtr driver,
actualType = virDomainNetGetActualType(net);
+ /* -2 means "multiple matches" so then fail also */
+ if (virDomainNetFindIdx(vm->def, net) != -1) {
+ virReportError(VIR_ERR_OPERATION_FAILED,
+ _("device matching mac address %s already exists"),
+ virMacAddrFormat(&net->mac, mac));
+ return -1;
+ }
+
if (actualType == VIR_DOMAIN_NET_TYPE_HOSTDEV) {
/* This is really a "smart hostdev", so it should be attached
* as a hostdev (the hostdev code will reach over into the
@@ -2879,6 +2888,7 @@ libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef,
virDomainDeviceDefPtr dev)
virDomainHostdevDefPtr hostdev;
virDomainHostdevDefPtr found;
virDomainHostdevSubsysPCIPtr pcisrc;
+ char mac[VIR_MAC_STRING_BUFLEN];
switch (dev->type) {
case VIR_DOMAIN_DEVICE_DISK:
@@ -2896,6 +2906,12 @@ libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef,
virDomainDeviceDefPtr dev)
case VIR_DOMAIN_DEVICE_NET:
net = dev->data.net;
+ if (virDomainNetFindIdx(vmdef, net) >= 0) {
+ virReportError(VIR_ERR_INVALID_ARG,
+ _("network device with mac %s already
exists."),
+ virMacAddrFormat(&net->mac, mac));
+ return -1;
+ }
if (virDomainNetInsert(vmdef, net))
return -1;
dev->data.net = NULL;
@@ -3060,8 +3076,18 @@ libxlDomainDetachNetDevice(libxlDriverPrivatePtr driver,
char mac[VIR_MAC_STRING_BUFLEN];
int ret = -1;
- if ((detachidx = virDomainNetFindIdx(vm->def, net)) < 0)
+ if ((detachidx = virDomainNetFindIdx(vm->def, net)) < 0) {
+ if (detachidx == -2) {
+ virReportError(VIR_ERR_OPERATION_FAILED,
+ _("multiple devices matching mac address %s found"),
+ virMacAddrFormat(&net->mac, mac));
+ } else {
+ virReportError(VIR_ERR_OPERATION_FAILED,
+ _("network device %s not found"),
+ virMacAddrFormat(&net->mac, mac));
+ }
return -1;
+ }
detach = vm->def->nets[detachidx];
@@ -3136,6 +3162,7 @@ libxlDomainDetachDeviceConfig(virDomainDefPtr vmdef,
virDomainDeviceDefPtr dev)
virDomainHostdevDefPtr hostdev, det_hostdev;
virDomainNetDefPtr net;
int idx;
+ char mac[VIR_MAC_STRING_BUFLEN];
switch (dev->type) {
case VIR_DOMAIN_DEVICE_DISK:
@@ -3150,8 +3177,18 @@ libxlDomainDetachDeviceConfig(virDomainDefPtr vmdef,
virDomainDeviceDefPtr dev)
case VIR_DOMAIN_DEVICE_NET:
net = dev->data.net;
- if ((idx = virDomainNetFindIdx(vmdef, net)) < 0)
+ if ((idx = virDomainNetFindIdx(vmdef, net)) < 0) {
+ if (idx == -2) {
+ virReportError(VIR_ERR_OPERATION_FAILED,
+ _("multiple devices matching mac address %s
found"),
+ virMacAddrFormat(&dev->data.net->mac, mac));
+ } else {
+ virReportError(VIR_ERR_OPERATION_FAILED,
+ _("network device %s not found"),
+ virMacAddrFormat(&dev->data.net->mac, mac));
+ }
return -1;
+ }
/* this is guaranteed to succeed */
virDomainNetDefFree(virDomainNetRemove(vmdef, idx));
--
1.8.3.1