[libvirt] [PATCH 5/9] libxl: prevent attaching multiple netdevs with the same MAC
Jim Fehlig
jfehlig at suse.com
Fri Mar 13 17:59:05 UTC 2015
Marek Marczykowski-Górecki wrote:
> It will not be possible to detach such device later. Also improve
> logging in such cases.
>
> Signed-off-by: Marek Marczykowski-Górecki <marmarek at invisiblethingslab.com>
> ---
> src/libxl/libxl_driver.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> Changes in v4:
> - use virDomainHasNet instead of virDomainNetFindIdx
>
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index ce3a99b..1313d2e 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 +2802,13 @@ libxlDomainAttachNetDevice(libxlDriverPrivatePtr driver,
>
> actualType = virDomainNetGetActualType(net);
>
> + if (virDomainHasNet(vm->def, net)) {
> + virReportError(VIR_ERR_OPERATION_FAILED,
> + _("device matching mac address %s already exists"),
>
> + virMacAddrFormat(&net->mac, mac));
I think the error should be VIR_ERR_INVALID_ARG, like you've done in the
last hunk below. I'll change that, and use the same text in both error
reports, before pushing. Otherwise, ACK.
Regards,
Jim
> + 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 +2887,7 @@ 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 +2905,12 @@ libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev)
>
> case VIR_DOMAIN_DEVICE_NET:
> net = dev->data.net;
> + if (virDomainHasNet(vmdef, net)) {
> + 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;
>
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