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Annotation of ntddk/src/network/tdi/send.c, revision 1.1

1.1     ! root        1: /*++
        !             2: 
        !             3: Copyright (c) 1989-1993  Microsoft Corporation
        !             4: 
        !             5: Module Name:
        !             6: 
        !             7:     send.c
        !             8: 
        !             9: Abstract:
        !            10: 
        !            11:     This module contains code which performs the following TDI services:
        !            12: 
        !            13:         o   TdiSend
        !            14:         o   TdiSendDatagram
        !            15: 
        !            16: Environment:
        !            17: 
        !            18:     Kernel mode
        !            19: 
        !            20: Revision History:
        !            21: 
        !            22: --*/
        !            23: 
        !            24: #include "st.h"
        !            25: 
        !            26: 
        !            27: NTSTATUS
        !            28: StTdiSend(
        !            29:     IN PIRP Irp
        !            30:     )
        !            31: 
        !            32: /*++
        !            33: 
        !            34: Routine Description:
        !            35: 
        !            36:     This routine performs the TdiSend request for the transport provider.
        !            37: 
        !            38: Arguments:
        !            39: 
        !            40:     Irp - Pointer to the I/O Request Packet for this request.
        !            41: 
        !            42: Return Value:
        !            43: 
        !            44:     NTSTATUS - status of operation.
        !            45: 
        !            46: --*/
        !            47: 
        !            48: {
        !            49:     KIRQL oldirql, cancelirql;
        !            50:     NTSTATUS status;
        !            51:     PTP_CONNECTION connection;
        !            52:     PMDL SendBuffer;
        !            53:     ULONG SendBufferLength;
        !            54:     PIO_STACK_LOCATION irpSp;
        !            55:     PTDI_REQUEST_KERNEL_SEND parameters;
        !            56:     PIRP TempIrp;
        !            57: 
        !            58:     //
        !            59:     // Determine which connection this send belongs on.
        !            60:     //
        !            61: 
        !            62:     irpSp = IoGetCurrentIrpStackLocation (Irp);
        !            63:     connection  = irpSp->FileObject->FsContext;
        !            64: 
        !            65:     //
        !            66:     // Check that this is really a connection.
        !            67:     //
        !            68: 
        !            69:     if ((connection->Size != sizeof (TP_CONNECTION)) ||
        !            70:         (connection->Type != ST_CONNECTION_SIGNATURE)) {
        !            71:         return STATUS_INVALID_CONNECTION;
        !            72:     }
        !            73: 
        !            74:     //
        !            75:     // Now map the data in to SVA space.
        !            76:     //
        !            77: 
        !            78:     parameters = (PTDI_REQUEST_KERNEL_SEND)(&irpSp->Parameters);
        !            79:     SendBuffer = Irp->MdlAddress;
        !            80:     SendBufferLength = parameters->SendLength;
        !            81: 
        !            82:     //
        !            83:     // Interpret send options.
        !            84:     //
        !            85: 
        !            86:     //
        !            87:     // Now we have a reference on the connection object.  Queue up this
        !            88:     // send to the connection object.
        !            89:     //
        !            90: 
        !            91: 
        !            92:     // This reference is removed by TdiDestroyRequest
        !            93: 
        !            94:     StReferenceConnection("TdiSend", connection);
        !            95: 
        !            96:     IRP_CONNECTION(irpSp) = connection;
        !            97:     IRP_REFCOUNT(irpSp) = 1;
        !            98: 
        !            99:     IoAcquireCancelSpinLock(&cancelirql);
        !           100:     ACQUIRE_SPIN_LOCK (&connection->SpinLock,&oldirql);
        !           101: 
        !           102:     if ((connection->Flags & CONNECTION_FLAGS_STOPPING) != 0) {
        !           103:         RELEASE_SPIN_LOCK (&connection->SpinLock,oldirql);
        !           104:         IoReleaseCancelSpinLock(cancelirql);
        !           105:         StCompleteSendIrp(
        !           106:             Irp,
        !           107:             connection->Status,
        !           108:             0);
        !           109:         status = STATUS_PENDING;
        !           110:     } else {
        !           111: 
        !           112:         StReferenceConnection ("Verify Temp Use", connection);
        !           113: 
        !           114:         //
        !           115:         // Insert onto the send queue, and make the IRP
        !           116:         // cancellable.
        !           117:         //
        !           118: 
        !           119:         InsertTailList (&connection->SendQueue,&Irp->Tail.Overlay.ListEntry);
        !           120: 
        !           121: 
        !           122:         //
        !           123:         // If this IRP has been cancelled, then call the
        !           124:         // cancel routine.
        !           125:         //
        !           126: 
        !           127:         if (Irp->Cancel) {
        !           128:             RELEASE_SPIN_LOCK (&connection->SpinLock,oldirql);
        !           129:             Irp->CancelIrql = cancelirql;
        !           130:             StCancelSend((PDEVICE_OBJECT)(connection->Provider), Irp);
        !           131:             StDereferenceConnection ("IRP cancelled", connection);   // release lookup hold.
        !           132:             return STATUS_PENDING;
        !           133:         }
        !           134: 
        !           135:         Irp->CancelRoutine = StCancelSend;
        !           136: 
        !           137:         //
        !           138:         // If this connection is waiting for an EOR to appear because a non-EOR
        !           139:         // send failed at some point in the past, fail this send. Clear the
        !           140:         // flag that causes this if this request has the EOR set.
        !           141:         //
        !           142:         // BUGBUG: Should the FailSend status be clearer here?
        !           143:         //
        !           144: 
        !           145:         if ((connection->Flags & CONNECTION_FLAGS_FAILING_TO_EOR) != 0) {
        !           146: 
        !           147:             RELEASE_SPIN_LOCK (&connection->SpinLock,oldirql);
        !           148:             IoReleaseCancelSpinLock(cancelirql);
        !           149: 
        !           150:             //
        !           151:             // BUGBUG: Should we save status from real failure?
        !           152:             //
        !           153: 
        !           154:             FailSend (connection, STATUS_LINK_FAILED, TRUE);
        !           155: 
        !           156:             if ( (parameters->SendFlags & TDI_SEND_PARTIAL) == 0) {
        !           157:                 connection->Flags &= ~CONNECTION_FLAGS_FAILING_TO_EOR;
        !           158:             }
        !           159: 
        !           160:             StDereferenceConnection ("Failing to EOR", connection);   // release lookup hold.
        !           161:             return STATUS_PENDING;
        !           162:         }
        !           163: 
        !           164: 
        !           165:         //
        !           166:         // If the send state is either IDLE or W_EOR, then we should
        !           167:         // begin packetizing this send.  Otherwise, some other event
        !           168:         // will cause it to be packetized.
        !           169:         //
        !           170: 
        !           171:         //
        !           172:         // NOTE: If we call StartPacketizingConnection, we make
        !           173:         // sure that it is the last operation we do on this
        !           174:         // connection. This allows us to "hand off" the reference
        !           175:         // we have to that function, which converts it into
        !           176:         // a reference for being on the packetize queue.
        !           177:         //
        !           178: 
        !           179:         switch (connection->SendState) {
        !           180: 
        !           181:         case CONNECTION_SENDSTATE_IDLE:
        !           182: 
        !           183:             InitializeSend (connection);   // sets state to PACKETIZE
        !           184: 
        !           185:             //
        !           186:             // If we can, packetize right now.
        !           187:             //
        !           188: 
        !           189:             if ((!(connection->Flags & CONNECTION_FLAGS_PACKETIZE)) &&
        !           190:                 (!(connection->Flags & CONNECTION_FLAGS_STOPPING))) {
        !           191: 
        !           192:                 connection->Flags |= CONNECTION_FLAGS_PACKETIZE;
        !           193: 
        !           194:                 RELEASE_SPIN_LOCK (&connection->SpinLock, oldirql);
        !           195:                 IoReleaseCancelSpinLock(cancelirql);
        !           196: 
        !           197:                 PacketizeSend (connection);
        !           198: 
        !           199:             } else {
        !           200: 
        !           201:                 RELEASE_SPIN_LOCK (&connection->SpinLock, oldirql);
        !           202:                 IoReleaseCancelSpinLock(cancelirql);
        !           203: 
        !           204:                 StDereferenceConnection ("Stopping or already packetizing", connection);   // release lookup hold.
        !           205: 
        !           206:             }
        !           207: 
        !           208:             break;
        !           209: 
        !           210:         case CONNECTION_SENDSTATE_W_EOR:
        !           211:             connection->SendState = CONNECTION_SENDSTATE_PACKETIZE;
        !           212: 
        !           213:             //
        !           214:             // Adjust the send variables on the connection so that
        !           215:             // they correctly point to this new send.  We can't call
        !           216:             // InitializeSend to do that, because we need to keep
        !           217:             // track of the other outstanding sends on this connection
        !           218:             // which have been sent but are a part of this message.
        !           219:             //
        !           220: 
        !           221:             TempIrp = CONTAINING_RECORD(
        !           222:                 connection->SendQueue.Flink,
        !           223:                 IRP,
        !           224:                 Tail.Overlay.ListEntry);
        !           225: 
        !           226:             connection->sp.CurrentSendIrp = TempIrp;
        !           227:             connection->sp.CurrentSendMdl = TempIrp->MdlAddress;
        !           228:             connection->sp.SendByteOffset = 0;
        !           229:             connection->CurrentSendLength +=
        !           230:                 IRP_SEND_LENGTH(IoGetCurrentIrpStackLocation(TempIrp));
        !           231: 
        !           232:             StartPacketizingConnection (connection, TRUE, oldirql, cancelirql);
        !           233:             break;
        !           234: 
        !           235:         default:
        !           236: 
        !           237:             //
        !           238:             // The connection is in another state (such as
        !           239:             // W_ACK or W_LINK), we just need to make sure
        !           240:             // to call InitializeSend if the new one is
        !           241:             // the first one on the list.
        !           242:             //
        !           243: 
        !           244:             //
        !           245:             // BUGBUG: Currently InitializeSend sets SendState,
        !           246:             // we should fix this.
        !           247:             //
        !           248: 
        !           249:             if (connection->SendQueue.Flink == &Irp->Tail.Overlay.ListEntry) {
        !           250:                 ULONG SavedSendState;
        !           251:                 SavedSendState = connection->SendState;
        !           252:                 InitializeSend (connection);
        !           253:                 connection->SendState = SavedSendState;
        !           254:             }
        !           255:             RELEASE_SPIN_LOCK (&connection->SpinLock, oldirql);
        !           256:             IoReleaseCancelSpinLock(cancelirql);
        !           257: 
        !           258:             StDereferenceConnection("temp TdiSend", connection);
        !           259: 
        !           260:         }
        !           261: 
        !           262:     }
        !           263: 
        !           264:     status = STATUS_PENDING;
        !           265: 
        !           266: 
        !           267:     return status;
        !           268: } /* TdiSend */
        !           269: 
        !           270: 
        !           271: NTSTATUS
        !           272: StTdiSendDatagram(
        !           273:     IN PIRP Irp
        !           274:     )
        !           275: 
        !           276: /*++
        !           277: 
        !           278: Routine Description:
        !           279: 
        !           280:     This routine performs the TdiSendDatagram request for the transport
        !           281:     provider.
        !           282: 
        !           283: Arguments:
        !           284: 
        !           285:     Irp - Pointer to the I/O Request Packet for this request.
        !           286: 
        !           287: Return Value:
        !           288: 
        !           289:     NTSTATUS - status of operation.
        !           290: 
        !           291: --*/
        !           292: 
        !           293: {
        !           294:     NTSTATUS status;
        !           295:     KIRQL oldirql;
        !           296:     PTP_REQUEST tpRequest;
        !           297:     PTP_ADDRESS_FILE addressFile;
        !           298:     PTP_ADDRESS address;
        !           299:     PMDL SendBuffer;
        !           300:     ULONG SendBufferLength;
        !           301:     PIO_STACK_LOCATION irpSp;
        !           302:     PTDI_REQUEST_KERNEL_SENDDG parameters;
        !           303:     LARGE_INTEGER timeout = {0,0};
        !           304:     UINT MaxUserData;
        !           305: 
        !           306:     irpSp = IoGetCurrentIrpStackLocation (Irp);
        !           307:     addressFile  = irpSp->FileObject->FsContext;
        !           308: 
        !           309:     status = StVerifyAddressObject (addressFile);
        !           310:     if (!NT_SUCCESS (status)) {
        !           311:         return status;
        !           312:     }
        !           313: 
        !           314:     address = addressFile->Address;
        !           315:     parameters = (PTDI_REQUEST_KERNEL_SENDDG)(&irpSp->Parameters);
        !           316:     SendBuffer = Irp->MdlAddress;
        !           317:     SendBufferLength = parameters->SendLength;
        !           318: 
        !           319:     //
        !           320:     // Check that the length is short enough.
        !           321:     //
        !           322: 
        !           323:     MacReturnMaxDataSize(
        !           324:         &address->Provider->MacInfo,
        !           325:         NULL,
        !           326:         0,
        !           327:         address->Provider->MaxSendPacketSize,
        !           328:         &MaxUserData);
        !           329: 
        !           330:     if (SendBufferLength >
        !           331:         (MaxUserData - sizeof(ST_HEADER))) {
        !           332: 
        !           333:         return STATUS_INVALID_PARAMETER;
        !           334: 
        !           335:     }
        !           336: 
        !           337:     //
        !           338:     // We need a request object to keep track of this TDI request.
        !           339:     // Attach this request to the address object.
        !           340:     //
        !           341: 
        !           342:     status = StCreateRequest (
        !           343:                  Irp,                           // IRP for this request.
        !           344:                  address,                       // context.
        !           345:                  REQUEST_FLAGS_ADDRESS,         // partial flags.
        !           346:                  SendBuffer,                    // the data to be sent.
        !           347:                  SendBufferLength,              // length of the data.
        !           348:                  timeout,
        !           349:                  &tpRequest);
        !           350: 
        !           351:     if (!NT_SUCCESS (status)) {
        !           352:         StDereferenceAddress ("no send request", address);
        !           353:         return status;                          // if we couldn't queue the request.
        !           354:     }
        !           355: 
        !           356:     StReferenceAddress ("Send datagram", address);
        !           357:     tpRequest->Owner = AddressType;
        !           358: 
        !           359:     ACQUIRE_SPIN_LOCK (&address->SpinLock,&oldirql);
        !           360: 
        !           361:     if ((address->Flags & ADDRESS_FLAGS_STOPPING) != 0) {
        !           362:         RELEASE_SPIN_LOCK (&address->SpinLock,oldirql);
        !           363:         StCompleteRequest (tpRequest, STATUS_NETWORK_NAME_DELETED, 0);
        !           364:         return STATUS_PENDING;
        !           365:     } else {
        !           366:         InsertTailList (
        !           367:             &address->SendDatagramQueue,
        !           368:             &tpRequest->Linkage);
        !           369:         RELEASE_SPIN_LOCK (&address->SpinLock,oldirql);
        !           370:     }
        !           371: 
        !           372:     //
        !           373:     // The request is queued.  Ship the next request at the head of the queue,
        !           374:     // provided the completion handler is not active.  We serialize this so
        !           375:     // that only one MDL and ST datagram header needs to be statically
        !           376:     // allocated for reuse by all send datagram requests.
        !           377:     //
        !           378: 
        !           379:     (VOID)StSendDatagramsOnAddress (address);
        !           380: 
        !           381:     StDereferenceAddress("tmp send datagram", address);
        !           382: 
        !           383:     return STATUS_PENDING;
        !           384: 
        !           385: } /* StTdiSendDatagram */

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