2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS kernel
4 * FILE: drivers/net/afd/afd/read.c
5 * PURPOSE: Ancillary functions driver
6 * PROGRAMMER: Art Yerkes (ayerkes@speakeasy.net)
10 * Improve buffering code
12 * We're keeping data receiving in one of two states:
13 * A) Some data available in the FCB
14 * FCB->Recv.BytesUsed != FCB->Recv.Content
15 * FCB->ReceiveIrp.InFlightRequest == NULL
16 * AFD_EVENT_RECEIVE set in FCB->PollState
17 * B) No data available in the FCB
18 * FCB->Recv.BytesUsed == FCB->Recv.Content (== 0)
19 * FCB->RecieveIrp.InFlightRequest != NULL
20 * AFD_EVENT_RECEIVED not set in FCB->PollState
21 * So basically we either have data available or a TDI receive
25 #include "tdi_proto.h"
29 static BOOLEAN
CantReadMore( PAFD_FCB FCB
) {
30 UINT BytesAvailable
= FCB
->Recv
.Content
- FCB
->Recv
.BytesUsed
;
32 return !BytesAvailable
&&
33 (FCB
->PollState
& (AFD_EVENT_CLOSE
| AFD_EVENT_DISCONNECT
));
36 static VOID
HandleEOFOnIrp( PAFD_FCB FCB
, NTSTATUS Status
, UINT Information
) {
37 if( Status
== STATUS_SUCCESS
&& Information
== 0 ) {
38 AFD_DbgPrint(MID_TRACE
,("Looks like an EOF\n"));
39 FCB
->PollState
|= AFD_EVENT_DISCONNECT
;
40 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
44 static NTSTATUS
TryToSatisfyRecvRequestFromBuffer( PAFD_FCB FCB
,
45 PAFD_RECV_INFO RecvReq
,
46 PUINT TotalBytesCopied
) {
47 UINT i
, BytesToCopy
= 0,
49 FCB
->Recv
.Content
- FCB
->Recv
.BytesUsed
;
52 *TotalBytesCopied
= 0;
55 AFD_DbgPrint(MID_TRACE
,("Called, BytesAvailable = %d\n",
58 if( CantReadMore(FCB
) ) return STATUS_SUCCESS
;
59 if( !BytesAvailable
) return STATUS_PENDING
;
61 Map
= (PAFD_MAPBUF
)(RecvReq
->BufferArray
+ RecvReq
->BufferCount
);
63 AFD_DbgPrint(MID_TRACE
,("Buffer Count: %d @ %x\n",
65 RecvReq
->BufferArray
));
67 RecvReq
->BufferArray
&&
69 i
< RecvReq
->BufferCount
;
72 MIN( RecvReq
->BufferArray
[i
].len
, BytesAvailable
);
75 Map
[i
].BufferAddress
= MmMapLockedPages( Map
[i
].Mdl
, KernelMode
);
77 AFD_DbgPrint(MID_TRACE
,("Buffer %d: %x:%d\n",
82 RtlCopyMemory( Map
[i
].BufferAddress
,
83 FCB
->Recv
.Window
+ FCB
->Recv
.BytesUsed
,
86 MmUnmapLockedPages( Map
[i
].BufferAddress
, Map
[i
].Mdl
);
88 *TotalBytesCopied
+= BytesToCopy
;
90 if (!(RecvReq
->TdiFlags
& TDI_RECEIVE_PEEK
)) {
91 FCB
->Recv
.BytesUsed
+= BytesToCopy
;
92 BytesAvailable
-= BytesToCopy
;
97 /* If there's nothing left in our buffer start a new request */
98 if( FCB
->Recv
.BytesUsed
== FCB
->Recv
.Content
) {
99 FCB
->Recv
.BytesUsed
= FCB
->Recv
.Content
= 0;
100 FCB
->PollState
&= ~AFD_EVENT_RECEIVE
;
101 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
103 if( !FCB
->ReceiveIrp
.InFlightRequest
) {
104 AFD_DbgPrint(MID_TRACE
,("Replenishing buffer\n"));
106 SocketCalloutEnter( FCB
);
108 Status
= TdiReceive( &FCB
->ReceiveIrp
.InFlightRequest
,
109 FCB
->Connection
.Object
,
113 &FCB
->ReceiveIrp
.Iosb
,
117 SocketCalloutLeave( FCB
);
119 if( Status
== STATUS_SUCCESS
)
120 FCB
->Recv
.Content
= FCB
->ReceiveIrp
.Iosb
.Information
;
121 HandleEOFOnIrp( FCB
, Status
, FCB
->ReceiveIrp
.Iosb
.Information
);
125 return STATUS_SUCCESS
;
128 static NTSTATUS
ReceiveActivity( PAFD_FCB FCB
, PIRP Irp
) {
129 PLIST_ENTRY NextIrpEntry
;
131 PIO_STACK_LOCATION NextIrpSp
;
132 PAFD_RECV_INFO RecvReq
;
133 UINT TotalBytesCopied
= 0, RetBytesCopied
= 0;
134 NTSTATUS Status
= STATUS_SUCCESS
, RetStatus
= STATUS_PENDING
;
136 AFD_DbgPrint(MID_TRACE
,("%x %x\n", FCB
, Irp
));
138 if( CantReadMore( FCB
) ) {
139 /* Success here means that we got an EOF. Complete a pending read
140 * with zero bytes if we haven't yet overread, then kill the others.
142 while( !IsListEmpty( &FCB
->PendingIrpList
[FUNCTION_RECV
] ) ) {
144 RemoveHeadList(&FCB
->PendingIrpList
[FUNCTION_RECV
]);
146 CONTAINING_RECORD(NextIrpEntry
, IRP
, Tail
.Overlay
.ListEntry
);
147 NextIrpSp
= IoGetCurrentIrpStackLocation( NextIrp
);
148 RecvReq
= NextIrpSp
->Parameters
.DeviceIoControl
.Type3InputBuffer
;
150 AFD_DbgPrint(MID_TRACE
,("Completing recv %x (%d)\n", NextIrp
,
152 UnlockBuffers( RecvReq
->BufferArray
,
153 RecvReq
->BufferCount
, FALSE
);
154 Status
= NextIrp
->IoStatus
.Status
=
155 FCB
->Overread
? STATUS_END_OF_FILE
: STATUS_SUCCESS
;
156 NextIrp
->IoStatus
.Information
= 0;
157 if( NextIrp
== Irp
) RetStatus
= Status
;
158 if( NextIrp
->MdlAddress
) UnlockRequest( NextIrp
, IoGetCurrentIrpStackLocation( NextIrp
) );
159 IoCompleteRequest( NextIrp
, IO_NETWORK_INCREMENT
);
160 FCB
->Overread
= TRUE
;
161 //FCB->PollState |= AFD_EVENT_DISCONNECT;
162 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
165 /* Kick the user that receive would be possible now */
166 /* XXX Not implemented yet */
168 AFD_DbgPrint(MID_TRACE
,("FCB %x Receive data waiting %d\n",
169 FCB
, FCB
->Recv
.Content
));
170 /*OskitDumpBuffer( FCB->Recv.Window, FCB->Recv.Content );*/
172 /* Try to clear some requests */
173 while( !IsListEmpty( &FCB
->PendingIrpList
[FUNCTION_RECV
] ) ) {
175 RemoveHeadList(&FCB
->PendingIrpList
[FUNCTION_RECV
]);
177 CONTAINING_RECORD(NextIrpEntry
, IRP
, Tail
.Overlay
.ListEntry
);
178 NextIrpSp
= IoGetCurrentIrpStackLocation( NextIrp
);
179 RecvReq
= NextIrpSp
->Parameters
.DeviceIoControl
.Type3InputBuffer
;
181 AFD_DbgPrint(MID_TRACE
,("RecvReq @ %x\n", RecvReq
));
183 Status
= TryToSatisfyRecvRequestFromBuffer
184 ( FCB
, RecvReq
, &TotalBytesCopied
);
186 if( Status
== STATUS_PENDING
) {
187 AFD_DbgPrint(MID_TRACE
,("Ran out of data for %x\n", NextIrp
));
188 InsertHeadList(&FCB
->PendingIrpList
[FUNCTION_RECV
],
189 &NextIrp
->Tail
.Overlay
.ListEntry
);
192 AFD_DbgPrint(MID_TRACE
,("Completing recv %x (%d)\n", NextIrp
,
194 UnlockBuffers( RecvReq
->BufferArray
,
195 RecvReq
->BufferCount
, FALSE
);
196 NextIrp
->IoStatus
.Status
= Status
;
197 NextIrp
->IoStatus
.Information
= TotalBytesCopied
;
198 if( NextIrp
== Irp
) {
200 RetBytesCopied
= TotalBytesCopied
;
202 if( NextIrp
->MdlAddress
) UnlockRequest( NextIrp
, IoGetCurrentIrpStackLocation( NextIrp
) );
203 IoCompleteRequest( NextIrp
, IO_NETWORK_INCREMENT
);
208 if( FCB
->Recv
.Content
) {
209 FCB
->PollState
|= AFD_EVENT_RECEIVE
;
211 FCB
->PollState
&= ~AFD_EVENT_RECEIVE
;
213 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
215 AFD_DbgPrint(MID_TRACE
,("RetStatus for irp %x is %x\n", Irp
, RetStatus
));
217 /* Sometimes we're called with a NULL Irp */
219 Irp
->IoStatus
.Status
= RetStatus
;
220 Irp
->IoStatus
.Information
= RetBytesCopied
;
226 NTSTATUS NTAPI ReceiveComplete
227 ( PDEVICE_OBJECT DeviceObject
,
230 NTSTATUS Status
= Irp
->IoStatus
.Status
;
231 PAFD_FCB FCB
= (PAFD_FCB
)Context
;
233 AFD_DbgPrint(MID_TRACE
,("Called\n"));
235 ASSERT_IRQL(APC_LEVEL
);
237 if( !SocketAcquireStateLock( FCB
) ) return Status
;
239 FCB
->ReceiveIrp
.InFlightRequest
= NULL
;
242 SocketStateUnlock( FCB
);
243 return STATUS_CANCELLED
;
246 FCB
->Recv
.Content
= Irp
->IoStatus
.Information
;
247 FCB
->Recv
.BytesUsed
= 0;
249 if( FCB
->State
== SOCKET_STATE_CLOSED
) {
250 AFD_DbgPrint(MIN_TRACE
,("!!! CLOSED SOCK GOT A RECEIVE COMPLETE !!!\n"));
251 SocketStateUnlock( FCB
);
252 DestroySocket( FCB
);
253 return STATUS_SUCCESS
;
254 } else if( FCB
->State
== SOCKET_STATE_LISTENING
) {
255 AFD_DbgPrint(MIN_TRACE
,("!!! LISTENER GOT A RECEIVE COMPLETE !!!\n"));
256 SocketStateUnlock( FCB
);
257 return STATUS_INVALID_PARAMETER
;
260 HandleEOFOnIrp( FCB
, Irp
->IoStatus
.Status
, Irp
->IoStatus
.Information
);
262 ReceiveActivity( FCB
, NULL
);
264 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
266 SocketStateUnlock( FCB
);
268 AFD_DbgPrint(MID_TRACE
,("Returned %x\n", Status
));
270 return STATUS_SUCCESS
;
274 AfdConnectedSocketReadData(PDEVICE_OBJECT DeviceObject
, PIRP Irp
,
275 PIO_STACK_LOCATION IrpSp
, BOOLEAN Short
) {
276 NTSTATUS Status
= STATUS_INVALID_PARAMETER
;
277 PFILE_OBJECT FileObject
= IrpSp
->FileObject
;
278 PAFD_FCB FCB
= FileObject
->FsContext
;
279 PAFD_RECV_INFO RecvReq
;
280 UINT TotalBytesCopied
= 0;
282 AFD_DbgPrint(MID_TRACE
,("Called on %x\n", FCB
));
284 if( !SocketAcquireStateLock( FCB
) ) return LostSocket( Irp
);
286 if( FCB
->State
!= SOCKET_STATE_CONNECTED
&&
287 FCB
->State
!= SOCKET_STATE_CONNECTING
) {
288 AFD_DbgPrint(MID_TRACE
,("Called recv on wrong kind of socket (s%x)\n",
290 return UnlockAndMaybeComplete( FCB
, STATUS_INVALID_PARAMETER
,
294 if( FCB
->Flags
& AFD_ENDPOINT_CONNECTIONLESS
)
296 AFD_DbgPrint(MID_TRACE
,("Receive on connection-less sockets not implemented\n"));
297 return UnlockAndMaybeComplete( FCB
, STATUS_NOT_IMPLEMENTED
,
301 FCB
->EventsFired
&= ~AFD_EVENT_RECEIVE
;
302 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
304 if( !(RecvReq
= LockRequest( Irp
, IrpSp
)) )
305 return UnlockAndMaybeComplete( FCB
, STATUS_NO_MEMORY
,
308 AFD_DbgPrint(MID_TRACE
,("Recv flags %x\n", RecvReq
->AfdFlags
));
310 RecvReq
->BufferArray
= LockBuffers( RecvReq
->BufferArray
,
311 RecvReq
->BufferCount
,
315 if( !RecvReq
->BufferArray
) {
316 return UnlockAndMaybeComplete( FCB
, STATUS_ACCESS_VIOLATION
,
320 Irp
->IoStatus
.Status
= STATUS_PENDING
;
321 Irp
->IoStatus
.Information
= 0;
323 InsertTailList( &FCB
->PendingIrpList
[FUNCTION_RECV
],
324 &Irp
->Tail
.Overlay
.ListEntry
);
326 /************ From this point, the IRP is not ours ************/
328 Status
= ReceiveActivity( FCB
, Irp
);
330 if( Status
== STATUS_PENDING
&& RecvReq
->AfdFlags
& AFD_IMMEDIATE
) {
331 AFD_DbgPrint(MID_TRACE
,("Nonblocking\n"));
332 Status
= STATUS_CANT_WAIT
;
333 TotalBytesCopied
= 0;
334 RemoveEntryList( &Irp
->Tail
.Overlay
.ListEntry
);
335 UnlockBuffers( RecvReq
->BufferArray
, RecvReq
->BufferCount
, FALSE
);
336 return UnlockAndMaybeComplete( FCB
, Status
, Irp
,
337 TotalBytesCopied
, NULL
);
338 } else if( Status
== STATUS_PENDING
) {
339 AFD_DbgPrint(MID_TRACE
,("Leaving read irp\n"));
340 IoMarkIrpPending( Irp
);
342 AFD_DbgPrint(MID_TRACE
,("Completed with status %x\n", Status
));
345 SocketStateUnlock( FCB
);
350 static NTSTATUS STDCALL
351 SatisfyPacketRecvRequest( PAFD_FCB FCB
, PIRP Irp
,
352 PAFD_STORED_DATAGRAM DatagramRecv
,
353 PUINT TotalBytesCopied
) {
354 NTSTATUS Status
= STATUS_SUCCESS
;
355 PIO_STACK_LOCATION IrpSp
= IoGetCurrentIrpStackLocation( Irp
);
356 PAFD_RECV_INFO RecvReq
=
357 IrpSp
->Parameters
.DeviceIoControl
.Type3InputBuffer
;
358 UINT BytesToCopy
= 0, BytesAvailable
= DatagramRecv
->Len
, AddrLen
= 0;
361 Map
= (PAFD_MAPBUF
)(RecvReq
->BufferArray
+
362 RecvReq
->BufferCount
+
366 MIN( RecvReq
->BufferArray
[0].len
, BytesAvailable
);
368 AFD_DbgPrint(MID_TRACE
,("BytesToCopy: %d len %d\n", BytesToCopy
,
369 RecvReq
->BufferArray
[0].len
));
372 /* Copy the address */
373 if( Map
[1].Mdl
&& Map
[2].Mdl
) {
374 AFD_DbgPrint(MID_TRACE
,("Checking TAAddressCount\n"));
376 if( DatagramRecv
->Address
->TAAddressCount
!= 1 ) {
379 ("Wierd address count %d\n",
380 DatagramRecv
->Address
->TAAddressCount
));
383 AFD_DbgPrint(MID_TRACE
,("Computing addr len\n"));
385 AddrLen
= MIN(DatagramRecv
->Address
->Address
->AddressLength
+
387 RecvReq
->BufferArray
[1].len
);
389 AFD_DbgPrint(MID_TRACE
,("Copying %d bytes of address\n", AddrLen
));
391 Map
[1].BufferAddress
= MmMapLockedPages( Map
[1].Mdl
, KernelMode
);
393 AFD_DbgPrint(MID_TRACE
,("Done mapping, copying address\n"));
395 RtlCopyMemory( Map
[1].BufferAddress
,
396 &DatagramRecv
->Address
->Address
->AddressType
,
399 MmUnmapLockedPages( Map
[1].BufferAddress
, Map
[1].Mdl
);
401 AFD_DbgPrint(MID_TRACE
,("Copying address len\n"));
403 Map
[2].BufferAddress
= MmMapLockedPages( Map
[2].Mdl
, KernelMode
);
404 *((PINT
)Map
[2].BufferAddress
) = AddrLen
;
405 MmUnmapLockedPages( Map
[2].BufferAddress
, Map
[2].Mdl
);
408 AFD_DbgPrint(MID_TRACE
,("Mapping data buffer pages\n"));
410 Map
[0].BufferAddress
= MmMapLockedPages( Map
[0].Mdl
, KernelMode
);
412 AFD_DbgPrint(MID_TRACE
,("Buffer %d: %x:%d\n",
414 Map
[0].BufferAddress
,
418 ( FCB->Recv.Window + FCB->Recv.BytesUsed, BytesToCopy ); */
420 RtlCopyMemory( Map
[0].BufferAddress
,
421 FCB
->Recv
.Window
+ FCB
->Recv
.BytesUsed
,
424 MmUnmapLockedPages( Map
[0].BufferAddress
, Map
[0].Mdl
);
426 *TotalBytesCopied
= BytesToCopy
;
428 if (!(RecvReq
->TdiFlags
& TDI_RECEIVE_PEEK
)) {
429 FCB
->Recv
.BytesUsed
= 0;
433 Status
= Irp
->IoStatus
.Status
= STATUS_SUCCESS
;
434 Irp
->IoStatus
.Information
= BytesToCopy
;
435 ExFreePool( DatagramRecv
->Address
);
436 ExFreePool( DatagramRecv
);
438 AFD_DbgPrint(MID_TRACE
,("Done\n"));
444 PacketSocketRecvComplete(
445 PDEVICE_OBJECT DeviceObject
,
448 NTSTATUS Status
= STATUS_SUCCESS
;
449 PAFD_FCB FCB
= Context
;
451 PIO_STACK_LOCATION NextIrpSp
;
452 PLIST_ENTRY ListEntry
;
453 PAFD_RECV_INFO RecvReq
;
454 PAFD_STORED_DATAGRAM DatagramRecv
;
455 UINT DGSize
= Irp
->IoStatus
.Information
+ sizeof( AFD_STORED_DATAGRAM
);
457 AFD_DbgPrint(MID_TRACE
,("Called on %x\n", FCB
));
459 if( !SocketAcquireStateLock( FCB
) ) return STATUS_FILE_CLOSED
;
461 FCB
->ReceiveIrp
.InFlightRequest
= NULL
;
464 SocketStateUnlock( FCB
);
465 return STATUS_CANCELLED
;
468 if( FCB
->State
== SOCKET_STATE_CLOSED
) {
469 SocketStateUnlock( FCB
);
470 DestroySocket( FCB
);
471 return STATUS_SUCCESS
;
474 DatagramRecv
= ExAllocatePool( NonPagedPool
, DGSize
);
477 DatagramRecv
->Len
= Irp
->IoStatus
.Information
;
478 RtlCopyMemory( DatagramRecv
->Buffer
, FCB
->Recv
.Window
,
480 AFD_DbgPrint(MID_TRACE
,("Received (A %x)\n",
481 FCB
->AddressFrom
->RemoteAddress
));
482 DatagramRecv
->Address
=
483 TaCopyTransportAddress( FCB
->AddressFrom
->RemoteAddress
);
485 if( !DatagramRecv
->Address
) Status
= STATUS_NO_MEMORY
;
487 } else Status
= STATUS_NO_MEMORY
;
489 if( !NT_SUCCESS( Status
) ) {
490 if( DatagramRecv
) ExFreePool( DatagramRecv
);
491 SocketStateUnlock( FCB
);
494 InsertTailList( &FCB
->DatagramList
, &DatagramRecv
->ListEntry
);
497 /* Satisfy as many requests as we can */
499 while( !IsListEmpty( &FCB
->DatagramList
) &&
500 !IsListEmpty( &FCB
->PendingIrpList
[FUNCTION_RECV
] ) ) {
501 AFD_DbgPrint(MID_TRACE
,("Looping trying to satisfy request\n"));
502 ListEntry
= RemoveHeadList( &FCB
->DatagramList
);
503 DatagramRecv
= CONTAINING_RECORD( ListEntry
, AFD_STORED_DATAGRAM
,
505 ListEntry
= RemoveHeadList( &FCB
->PendingIrpList
[FUNCTION_RECV
] );
506 NextIrp
= CONTAINING_RECORD( ListEntry
, IRP
, Tail
.Overlay
.ListEntry
);
507 NextIrpSp
= IoGetCurrentIrpStackLocation( NextIrp
);
508 RecvReq
= NextIrpSp
->Parameters
.DeviceIoControl
.Type3InputBuffer
;
510 AFD_DbgPrint(MID_TRACE
,("RecvReq: %x, DatagramRecv: %x\n",
511 RecvReq
, DatagramRecv
));
513 if( DatagramRecv
->Len
> RecvReq
->BufferArray
[0].len
&&
514 !(RecvReq
->TdiFlags
& TDI_RECEIVE_PARTIAL
) ) {
515 InsertHeadList( &FCB
->DatagramList
,
516 &DatagramRecv
->ListEntry
);
517 Status
= NextIrp
->IoStatus
.Status
= STATUS_BUFFER_TOO_SMALL
;
518 NextIrp
->IoStatus
.Information
= DatagramRecv
->Len
;
519 UnlockBuffers( RecvReq
->BufferArray
, RecvReq
->BufferCount
, TRUE
);
520 if ( NextIrp
->MdlAddress
) UnlockRequest( NextIrp
, IoGetCurrentIrpStackLocation( NextIrp
) );
521 IoCompleteRequest( NextIrp
, IO_NETWORK_INCREMENT
);
523 AFD_DbgPrint(MID_TRACE
,("Satisfying\n"));
524 Status
= SatisfyPacketRecvRequest
525 ( FCB
, NextIrp
, DatagramRecv
,
526 (PUINT
)&NextIrp
->IoStatus
.Information
);
527 AFD_DbgPrint(MID_TRACE
,("Unlocking\n"));
528 UnlockBuffers( RecvReq
->BufferArray
, RecvReq
->BufferCount
, TRUE
);
529 if ( NextIrp
->MdlAddress
) UnlockRequest( NextIrp
, IoGetCurrentIrpStackLocation( NextIrp
) );
530 AFD_DbgPrint(MID_TRACE
,("Completing\n"));
531 IoCompleteRequest( NextIrp
, IO_NETWORK_INCREMENT
);
535 if( !IsListEmpty( &FCB
->DatagramList
) ) {
536 AFD_DbgPrint(MID_TRACE
,("Signalling\n"));
537 FCB
->PollState
|= AFD_EVENT_RECEIVE
;
539 FCB
->PollState
&= ~AFD_EVENT_RECEIVE
;
541 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
543 if( NT_SUCCESS(Irp
->IoStatus
.Status
) ) {
544 /* Now relaunch the datagram request */
545 SocketCalloutEnter( FCB
);
547 Status
= TdiReceiveDatagram
548 ( &FCB
->ReceiveIrp
.InFlightRequest
,
549 FCB
->AddressFile
.Object
,
554 &FCB
->ReceiveIrp
.Iosb
,
555 PacketSocketRecvComplete
,
558 SocketCalloutLeave( FCB
);
561 SocketStateUnlock( FCB
);
563 return STATUS_SUCCESS
;
567 AfdPacketSocketReadData(PDEVICE_OBJECT DeviceObject
, PIRP Irp
,
568 PIO_STACK_LOCATION IrpSp
) {
569 NTSTATUS Status
= STATUS_SUCCESS
;
570 PFILE_OBJECT FileObject
= IrpSp
->FileObject
;
571 PAFD_FCB FCB
= FileObject
->FsContext
;
572 PAFD_RECV_INFO_UDP RecvReq
;
573 PLIST_ENTRY ListEntry
;
574 PAFD_STORED_DATAGRAM DatagramRecv
;
576 AFD_DbgPrint(MID_TRACE
,("Called on %x\n", FCB
));
578 if( !SocketAcquireStateLock( FCB
) ) return LostSocket( Irp
);
580 FCB
->EventsFired
&= ~AFD_EVENT_RECEIVE
;
582 /* Check that the socket is bound */
583 if( FCB
->State
!= SOCKET_STATE_BOUND
)
584 return UnlockAndMaybeComplete
585 ( FCB
, STATUS_INVALID_PARAMETER
, Irp
, 0, NULL
);
586 if( !(RecvReq
= LockRequest( Irp
, IrpSp
)) )
587 return UnlockAndMaybeComplete
588 ( FCB
, STATUS_NO_MEMORY
, Irp
, 0, NULL
);
590 AFD_DbgPrint(MID_TRACE
,("Recv flags %x\n", RecvReq
->AfdFlags
));
592 RecvReq
->BufferArray
= LockBuffers( RecvReq
->BufferArray
,
593 RecvReq
->BufferCount
,
595 RecvReq
->AddressLength
,
598 if( !RecvReq
->BufferArray
) { /* access violation in userspace */
599 return UnlockAndMaybeComplete
600 ( FCB
, STATUS_ACCESS_VIOLATION
, Irp
, 0, NULL
);
603 if( !IsListEmpty( &FCB
->DatagramList
) ) {
604 ListEntry
= RemoveHeadList( &FCB
->DatagramList
);
605 DatagramRecv
= CONTAINING_RECORD
606 ( ListEntry
, AFD_STORED_DATAGRAM
, ListEntry
);
607 if( DatagramRecv
->Len
> RecvReq
->BufferArray
[0].len
&&
608 !(RecvReq
->TdiFlags
& TDI_RECEIVE_PARTIAL
) ) {
609 InsertHeadList( &FCB
->DatagramList
,
610 &DatagramRecv
->ListEntry
);
611 Status
= Irp
->IoStatus
.Status
= STATUS_BUFFER_TOO_SMALL
;
612 Irp
->IoStatus
.Information
= DatagramRecv
->Len
;
614 if( IsListEmpty( &FCB
->DatagramList
) )
615 FCB
->PollState
&= ~AFD_EVENT_RECEIVE
;
617 FCB
->PollState
|= AFD_EVENT_RECEIVE
;
619 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
621 UnlockBuffers( RecvReq
->BufferArray
, RecvReq
->BufferCount
, TRUE
);
623 return UnlockAndMaybeComplete
624 ( FCB
, Status
, Irp
, Irp
->IoStatus
.Information
, NULL
);
626 Status
= SatisfyPacketRecvRequest
627 ( FCB
, Irp
, DatagramRecv
,
628 (PUINT
)&Irp
->IoStatus
.Information
);
630 if( IsListEmpty( &FCB
->DatagramList
) )
631 FCB
->PollState
&= ~AFD_EVENT_RECEIVE
;
633 FCB
->PollState
|= AFD_EVENT_RECEIVE
;
635 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
637 UnlockBuffers( RecvReq
->BufferArray
, RecvReq
->BufferCount
, TRUE
);
639 return UnlockAndMaybeComplete
640 ( FCB
, Status
, Irp
, Irp
->IoStatus
.Information
, NULL
);
642 } else if( RecvReq
->AfdFlags
& AFD_IMMEDIATE
) {
643 AFD_DbgPrint(MID_TRACE
,("Nonblocking\n"));
644 Status
= STATUS_CANT_WAIT
;
645 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
646 UnlockBuffers( RecvReq
->BufferArray
, RecvReq
->BufferCount
, TRUE
);
647 return UnlockAndMaybeComplete( FCB
, Status
, Irp
, 0, NULL
);
649 PollReeval( FCB
->DeviceExt
, FCB
->FileObject
);
650 return LeaveIrpUntilLater( FCB
, Irp
, FUNCTION_RECV
);