PROTOCOL_CO_RECEIVE_NET_BUFFER_LISTS callback function (ndis.h)

The ProtocolCoReceiveNetBufferLists function processes receive indications from underlying drivers.

Note  You must declare the function by using the PROTOCOL_CO_RECEIVE_NET_BUFFER_LISTS type. For more information, see the following Examples section.



void ProtocolCoReceiveNetBufferLists(
  [in] NDIS_HANDLE ProtocolBindingContext,
  [in] NDIS_HANDLE ProtocolVcContext,
  [in] PNET_BUFFER_LIST NetBufferLists,
  [in] ULONG NumberOfNetBufferLists,
  [in] ULONG ReceiveFlags


[in] ProtocolBindingContext

A handle to a context area that the protocol driver allocated to maintain state information for a binding. This handle was passed to NDIS in a previous call to NdisOpenAdapterEx.

[in] ProtocolVcContext

A handle to a protocol driver-allocated context area in which this driver maintains the per-virtual connection (VC) run-time state information. A client or stand-alone call manager supplied this handle either when it called the NdisCoCreateVc function or from its ProtocolCoCreateVc function.

[in] NetBufferLists

A linked list of NET_BUFFER_LIST structures that the underlying driver allocated. Each NET_BUFFER_LIST structure is usually associated with one NET_BUFFER structure.

[in] NumberOfNetBufferLists

The number of NET_BUFFER_LIST structures that are in the linked list of structures that NetBufferLists specifies.

[in] ReceiveFlags

Flags that define attributes for the send operation. The flags can be combined with a bitwise OR operation. To clear all of the flags, set this parameter to zero. ProtocolCoReceiveNetBufferLists supports the following flags:


The current IRQL is DISPATCH_LEVEL. For more information about this flag, see Dispatch IRQL Tracking.


NDIS reclaims ownership of the NET_BUFFER_LIST structures and any attached NET_BUFFER structures immediately after the call to ProtocolCoReceiveNetBufferLists returns.

Return value



The ProtocolCoReceiveNetBufferLists function is required for CoNDIS protocol drivers. NDIS calls ProtocolCoReceiveNetBufferLists after a bound miniport driver calls the NdisMCoIndicateReceiveNetBufferLists function. A call to ProtocolCoReceiveNetBufferLists can also occur as a result of a loopback.

If the NDIS_RECEIVE_FLAGS_RESOURCES flag in the CoReceiveFlags parameter is not set, the protocol driver retains ownership of the NET_BUFFER_LIST structures until it calls the NdisReturnNetBufferLists function. If NDIS sets the NDIS_RECEIVE_FLAGS_RESOURCES flag, the protocol driver cannot retain the NET_BUFFER_LIST structure and associated resources. NDIS_RECEIVE_FLAGS_RESOURCES indicates that an underlying driver has low receive resources. In this case, the ProtocolCoReceiveNetBufferLists function should copy the received data into protocol-allocated storage and return as quickly as possible.

On a multiprocessor system, ProtocolCoReceiveNetBufferLists can run concurrently on more than one processor. In this situation, apply protection (for example, use spin locks) to critical data structures that ProtocolCoReceiveNetBufferLists accesses.

NDIS calls ProtocolCoReceiveNetBufferLists at IRQL<= DISPATCH_LEVEL.


To define a ProtocolCoReceiveNetBufferLists function, you must first provide a function declaration that identifies the type of function you're defining. Windows provides a set of function types for drivers. Declaring a function using the function types helps Code Analysis for Drivers, Static Driver Verifier (SDV), and other verification tools find errors, and it's a requirement for writing drivers for the Windows operating system.

For example, to define a ProtocolCoReceiveNetBufferLists function that is named "MyCoReceiveNetBufferLists", use the PROTOCOL_CO_RECEIVE_NET_BUFFER_LISTS type as shown in this code example:


Then, implement your function as follows:

    NDIS_HANDLE  ProtocolBindingContext,
    NDIS_HANDLE  ProtocolVcContext,
    INPNET_BUFFER_LIST  NetBufferLists,
    ULONG  NumberOfNetBufferLists,
    ULONG  ReceiveFlags

The PROTOCOL_CO_RECEIVE_NET_BUFFER_LISTS function type is defined in the Ndis.h header file. To more accurately identify errors when you run the code analysis tools, be sure to add the Use_decl_annotations annotation to your function definition. The Use_decl_annotations annotation ensures that the annotations that are applied to the PROTOCOL_CO_RECEIVE_NET_BUFFER_LISTS function type in the header file are used. For more information about the requirements for function declarations, see Declaring Functions by Using Function Role Types for NDIS Drivers.

For information about Use_decl_annotations, see Annotating Function Behavior.


Minimum supported client Supported in NDIS 6.0 and later.
Target Platform Windows
Header ndis.h (include Ndis.h)

See also

CoNDIS Protocol Driver Send and Receive Functions