I am writing a network driver for Windows. I want to do something like the pseudocode below:
Init_interface_link_status = disconnected (Equivalent to DOWN in Linux)
Repeat using delayed workitem:
if (condition is true)
interface_link_status = connected (UP)
break
else
interface_link_status = disconnected (DOWN)
All this happens inside the driver code.
I am using Windows Driver Samples as reference. I have found something that looks promising: https://github.com/microsoft/Windows-driver-samples/blob/master/network/ndis/netvmini/6x/adapter.c#L353
AdapterGeneral.MediaConnectState = HWGetMediaConnectStatus(Adapter);
I can set this MediaConnectSate to MediaConnectStateDisconnected
here and the driver initialises in Disconnected state which is what I want.
But I can't find a way to change this state elsewhere after the driver is initialised.
Found inspiration from a proprietary network driver code. This function turns interface on/off:
VOID NSUChangeAdapterLinkState(
_In_ PMP_ADAPTER Adapter,
_In_ BOOLEAN TurnInterfaceUP)
/*++
Routine Description:
Change Adapter Link's state. This is equivalent to doing ifup/ifdown on Linux.
Arguments:
Adapter - Pointer to our adapter
TurnInterfaceUP - Pass TRUE to turn interface UP, FALSE to turn DOWN
Return Value:
None
--*/
{
NDIS_LINK_STATE LinkState;
NDIS_STATUS_INDICATION StatusIndication;
RtlZeroMemory(&LinkState, sizeof(LinkState));
LinkState.Header.Revision = NDIS_LINK_STATE_REVISION_1;
LinkState.Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
LinkState.Header.Size = NDIS_SIZEOF_LINK_STATE_REVISION_1;
if (TurnInterfaceUP)
{
LinkState.MediaConnectState = MediaConnectStateConnected;
MP_CLEAR_FLAG(Adapter, fMP_DISCONNECTED);
} else
{
LinkState.MediaConnectState = MediaConnectStateDisconnected;
MP_SET_FLAG(Adapter, fMP_DISCONNECTED);
}
LinkState.RcvLinkSpeed = Adapter->ulLinkRecvSpeed;
LinkState.XmitLinkSpeed = Adapter->ulLinkSendSpeed;
LinkState.MediaDuplexState = MediaDuplexStateFull;
RtlZeroMemory(&StatusIndication, sizeof(StatusIndication));
StatusIndication.Header.Type = NDIS_OBJECT_TYPE_STATUS_INDICATION;
StatusIndication.Header.Revision = NDIS_STATUS_INDICATION_REVISION_1;
StatusIndication.Header.Size = NDIS_SIZEOF_STATUS_INDICATION_REVISION_1;
StatusIndication.SourceHandle = Adapter->AdapterHandle;
StatusIndication.StatusCode = NDIS_STATUS_LINK_STATE;
StatusIndication.StatusBuffer = &LinkState;
StatusIndication.StatusBufferSize = sizeof(NDIS_LINK_STATE);
NdisMIndicateStatusEx(Adapter->AdapterHandle, &StatusIndication);
}