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The filter engine calls the vSwitchRuntimeStateRestoreNotifyFn (FWPS_VSWITCH_RUNTIME_STATE_RESTORE_CALLBACK0) callout function to notify a callout driver about virtual switch run-time state restore events.
Note FWPS_VSWITCH_RUNTIME_STATE_RESTORE_CALLBACK0 is a specific version of FWPS_VSWITCH_RUNTIME_STATE_RESTORE_CALLBACK. See WFP Version-Independent Names and Targeting Specific Versions of Windows for more information.
Syntax
FWPS_VSWITCH_RUNTIME_STATE_RESTORE_CALLBACK0 FwpsVswitchRuntimeStateRestoreCallback0;
NTSTATUS FwpsVswitchRuntimeStateRestoreCallback0(
[in, optional] void *notifyContext,
[in] void *completionContext,
[in] FWPS_VSWITCH_EVENT_TYPE eventType,
[in] const NDIS_SWITCH_PARAMETERS *vSwitch,
[in] NDIS_SWITCH_PORT_ID portId,
void *runtimeState,
[in] SIZE_T runtimeStateLength
)
{...}
Parameters
[in, optional] notifyContext
A pointer to a context provided by the callout driver. The driver passed this pointer to the notifyContext parameter of the FwpsvSwitchEventsSubscribe0 function. This parameter is optional and can be NULL.
[in] completionContext
A pointer to a completion context provided by the callout driver. This parameter is optional and can be NULL.
[in] eventType
The type of virtual switch event specified as one of the FWPS_VSWITCH_EVENT_TYPE enumeration values. For more information, see Remarks.
[in] vSwitch
A pointer to an NDIS_SWITCH_PARAMETERS structure that contains information about a virtual switch.
Note The information in the NDIS_SWITCH_PARAMETERS structure reflects the initial state of the virtual switch, not necessarily its current state. In particular, the NumSwitchPorts and IsActive members might still have their initial value of zero, unless a virtual switch PnP event has been triggered. Current state information can be found in the other parameters to this callback function.
[in] portId
The source switch port identifier.
runtimeState
The location of the run-time state output result buffer.
[in] runtimeStateLength
The length, in bytes, of the run-time state information in the run-time state buffer.
Return value
A callout's
FWPS_VSWITCH_RUNTIME_STATE_RESTORE_CALLBACK0 function returns one of the following NTSTATUS codes.
| Return code | Description |
|---|---|
|
The callout driver accepts the notification from the filter engine. |
|
The operation is pending and will be completed later. The callout driver will call the FwpsvSwitchNotifyComplete0 function to complete the pending operation. |
|
An error occurred. |
Remarks
A callout driver registers a vSwitchRuntimeStateRestoreNotifyFn function by calling the FwpsvSwitchEventsSubscribe0 function.
See the vSwitchRuntimeStateSaveNotifyFn (FWPS_VSWITCH_RUNTIME_STATE_SAVE_CALLBACK0) function for information about saving the run-time state.
Each saved data segment will be restored with an OID_SWITCH_NIC_RESTORE OID sent through the virtual switch extension stacks on the target system or on the local system during a restore operation. WFP will dispatch the data to the correct callout through vSwitchRuntimeStateRestoreNotifyFn after matching with a registered provider GUID. In this case, the eventType parameter of vSwitchRuntimeStateRestoreNotifyFn is set to FWPS_VSWITCH_EVENT_RUNTIME_STATE_RESTORE.
A callout can return STATUS_PENDING from vSwitchRuntimeStateRestoreNotifyFn. In this case, WFP will return STATUS_PENDING in the FilterOidRequest handler and will complete it at a later time. The callout driver will call the FwpsvSwitchNotifyComplete0 function to complete the pending operation.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 8. |
| Target Platform | Windows |
| Header | fwpsk.h (include Fwpsk.h) |
| IRQL | <= DISPATCH_LEVEL |
See also
Callout Driver Callout Functions