/*
* --------------------------------------------------------------------------
* Implements filter driver's FilterDetach function.
* --------------------------------------------------------------------------
*/
_Use_decl_annotations_
VOID
OvsExtDetach(NDIS_HANDLE filterModuleContext)
{
POVS_SWITCH_CONTEXT switchContext = (POVS_SWITCH_CONTEXT)filterModuleContext;
OVS_LOG_TRACE("Enter: filterModuleContext %p", filterModuleContext);
ASSERT(switchContext->dataFlowState == OvsSwitchPaused);
switchContext->controlFlowState = OvsSwitchDetached;
KeMemoryBarrier();
while(switchContext->pendingOidCount > 0) {
NdisMSleep(1000);
}
OvsDeleteSwitch(switchContext);
OvsCleanupIpHelper();
/* This completes the cleanup, and a new attach can be handled now. */
OVS_LOG_TRACE("Exit: OvsDetach Successfully");
}
/*
* --------------------------------------------------------------------------
* Implements filter driver's FilterAttach function.
*
* This function allocates the switch context, and initializes its necessary
* members.
* --------------------------------------------------------------------------
*/
NDIS_STATUS
OvsExtAttach(NDIS_HANDLE ndisFilterHandle,
NDIS_HANDLE filterDriverContext,
PNDIS_FILTER_ATTACH_PARAMETERS attachParameters)
{
NDIS_STATUS status = NDIS_STATUS_FAILURE;
NDIS_FILTER_ATTRIBUTES ovsExtAttributes;
POVS_SWITCH_CONTEXT switchContext = NULL;
UNREFERENCED_PARAMETER(filterDriverContext);
OVS_LOG_TRACE("Enter: ndisFilterHandle %p", ndisFilterHandle);
ASSERT(filterDriverContext == (NDIS_HANDLE)gOvsExtDriverObject);
if (attachParameters->MiniportMediaType != NdisMedium802_3) {
status = NDIS_STATUS_INVALID_PARAMETER;
goto cleanup;
}
if (gOvsExtDriverHandle == NULL) {
OVS_LOG_TRACE("Exit: OVSEXT driver is not loaded.");
ASSERT(FALSE);
goto cleanup;
}
NdisAcquireSpinLock(gOvsCtrlLock);
if (gOvsSwitchContext) {
NdisReleaseSpinLock(gOvsCtrlLock);
OVS_LOG_TRACE("Exit: Failed to create OVS Switch, only one datapath is"
"supported, %p.", gOvsSwitchContext);
goto cleanup;
}
if (gOvsInAttach) {
NdisReleaseSpinLock(gOvsCtrlLock);
/* Just fail the request. */
OVS_LOG_TRACE("Exit: Failed to create OVS Switch, since another attach"
"instance is in attach process.");
goto cleanup;
}
gOvsInAttach = TRUE;
NdisReleaseSpinLock(gOvsCtrlLock);
status = OvsInitIpHelper(ndisFilterHandle);
if (status != STATUS_SUCCESS) {
OVS_LOG_ERROR("Exit: Failed to initialize IP helper.");
goto cleanup;
}
status = OvsCreateSwitch(ndisFilterHandle, &switchContext);
if (status != NDIS_STATUS_SUCCESS) {
OvsCleanupIpHelper();
goto cleanup;
}
ASSERT(switchContext);
/*
* Register the switch context with NDIS so NDIS can pass it back to the
* Filterxxx callback functions as the 'FilterModuleContext' parameter.
*/
RtlZeroMemory(&ovsExtAttributes, sizeof(NDIS_FILTER_ATTRIBUTES));
ovsExtAttributes.Header.Revision = NDIS_FILTER_ATTRIBUTES_REVISION_1;
ovsExtAttributes.Header.Size = sizeof(NDIS_FILTER_ATTRIBUTES);
ovsExtAttributes.Header.Type = NDIS_OBJECT_TYPE_FILTER_ATTRIBUTES;
ovsExtAttributes.Flags = 0;
NDIS_DECLARE_FILTER_MODULE_CONTEXT(OVS_SWITCH_CONTEXT);
status = NdisFSetAttributes(ndisFilterHandle, switchContext, &ovsExtAttributes);
if (status != NDIS_STATUS_SUCCESS) {
OVS_LOG_ERROR("Failed to set attributes.");
OvsCleanupIpHelper();
goto cleanup;
}
/* Setup the state machine. */
switchContext->controlFlowState = OvsSwitchAttached;
switchContext->dataFlowState = OvsSwitchPaused;
gOvsSwitchContext = switchContext;
KeMemoryBarrier();
cleanup:
gOvsInAttach = FALSE;
if (status != NDIS_STATUS_SUCCESS) {
if (switchContext != NULL) {
OvsDeleteSwitch(switchContext);
}
}
OVS_LOG_TRACE("Exit: status %x", status);
return status;
}
