summaryrefslogtreecommitdiff
path: root/NetworkPkg/TcpDxe/TcpDriver.c
blob: 37e53af4b89d8b15a8375f9bd2189fbe4ffceb0d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
/** @file
  The driver binding and service binding protocol for the TCP driver.

  Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>

  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "TcpMain.h"

UINT16                        mTcp4RandomPort;
UINT16                        mTcp6RandomPort;

TCP_HEARTBEAT_TIMER           mTcpTimer = {
  NULL,
  0
};

EFI_TCP4_PROTOCOL             gTcp4ProtocolTemplate = {
  Tcp4GetModeData,
  Tcp4Configure,
  Tcp4Routes,
  Tcp4Connect,
  Tcp4Accept,
  Tcp4Transmit,
  Tcp4Receive,
  Tcp4Close,
  Tcp4Cancel,
  Tcp4Poll
};

EFI_TCP6_PROTOCOL             gTcp6ProtocolTemplate = {
  Tcp6GetModeData,
  Tcp6Configure,
  Tcp6Connect,
  Tcp6Accept,
  Tcp6Transmit,
  Tcp6Receive,
  Tcp6Close,
  Tcp6Cancel,
  Tcp6Poll
};

SOCK_INIT_DATA                mTcpDefaultSockData = {
  SockStream,
  SO_CLOSED,
  NULL,
  TCP_BACKLOG,
  TCP_SND_BUF_SIZE,
  TCP_RCV_BUF_SIZE,
  IP_VERSION_4,
  NULL,
  TcpCreateSocketCallback,
  TcpDestroySocketCallback,
  NULL,
  NULL,
  0,
  TcpDispatcher,
  NULL,
};

EFI_DRIVER_BINDING_PROTOCOL   gTcpDriverBinding = {
  TcpDriverBindingSupported,
  TcpDriverBindingStart,
  TcpDriverBindingStop,
  0xa,
  NULL,
  NULL
};

EFI_SERVICE_BINDING_PROTOCOL  gTcpServiceBinding = {
  TcpServiceBindingCreateChild,
  TcpServiceBindingDestroyChild
};


/**
  Create and start the heartbeat timer for the TCP driver.

  @retval EFI_SUCCESS            The timer was successfully created and started.
  @retval other                  The timer was not created.

**/
EFI_STATUS
TcpCreateTimer (
  VOID
  )
{
  EFI_STATUS  Status;

  Status = EFI_SUCCESS;

  if (mTcpTimer.RefCnt == 0) {

    Status = gBS->CreateEvent (
                    EVT_TIMER | EVT_NOTIFY_SIGNAL,
                    TPL_NOTIFY,
                    TcpTicking,
                    NULL,
                    &mTcpTimer.TimerEvent
                    );
    if (!EFI_ERROR (Status)) {

      Status = gBS->SetTimer (
                      mTcpTimer.TimerEvent,
                      TimerPeriodic,
                      (UINT64) (TICKS_PER_SECOND / TCP_TICK_HZ)
                      );
    }
  }

  if (!EFI_ERROR (Status)) {

    mTcpTimer.RefCnt++;
  }

  return Status;
}

/**
  Stop and destroy the heartbeat timer for TCP driver.

**/
VOID
TcpDestroyTimer (
  VOID
  )
{
  ASSERT (mTcpTimer.RefCnt > 0);

  mTcpTimer.RefCnt--;

  if (mTcpTimer.RefCnt > 0) {
    return;
  }

  gBS->SetTimer (mTcpTimer.TimerEvent, TimerCancel, 0);
  gBS->CloseEvent (mTcpTimer.TimerEvent);
  mTcpTimer.TimerEvent = NULL;
}

/**
  The entry point for Tcp driver, which is used to install Tcp driver on the ImageHandle.

  @param[in]  ImageHandle   The firmware allocated handle for this driver image.
  @param[in]  SystemTable   Pointer to the EFI system table.

  @retval EFI_SUCCESS   The driver loaded.
  @retval other         The driver did not load.

**/
EFI_STATUS
EFIAPI
TcpDriverEntryPoint (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
  UINT32      Seed;

  //
  // Install the TCP Driver Binding Protocol
  //
  Status = EfiLibInstallDriverBindingComponentName2 (
             ImageHandle,
             SystemTable,
             &gTcpDriverBinding,
             ImageHandle,
             &gTcpComponentName,
             &gTcpComponentName2
             );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Initialize ISS and random port.
  //
  Seed            = NetRandomInitSeed ();
  mTcpGlobalIss   = NET_RANDOM (Seed) % mTcpGlobalIss;
  mTcp4RandomPort = (UINT16) (TCP_PORT_KNOWN + (NET_RANDOM (Seed) % TCP_PORT_KNOWN));
  mTcp6RandomPort = mTcp4RandomPort;

  return EFI_SUCCESS;
}

/**
  Create a new TCP4 or TCP6 driver service binding protocol

  @param[in]  Controller         Controller handle of device to bind driver to.
  @param[in]  ImageHandle        The TCP driver's image handle.
  @param[in]  IpVersion          IP_VERSION_4 or IP_VERSION_6.

  @retval EFI_OUT_OF_RESOURCES   Failed to allocate some resources.
  @retval EFI_SUCCESS            A new IP6 service binding private was created.

**/
EFI_STATUS
TcpCreateService (
  IN EFI_HANDLE  Controller,
  IN EFI_HANDLE  Image,
  IN UINT8       IpVersion
  )
{
  EFI_STATUS         Status;
  EFI_GUID           *IpServiceBindingGuid;
  EFI_GUID           *TcpServiceBindingGuid;
  TCP_SERVICE_DATA   *TcpServiceData;
  IP_IO_OPEN_DATA    OpenData;

  if (IpVersion == IP_VERSION_4) {
    IpServiceBindingGuid  = &gEfiIp4ServiceBindingProtocolGuid;
    TcpServiceBindingGuid = &gEfiTcp4ServiceBindingProtocolGuid;
  } else {
    IpServiceBindingGuid  = &gEfiIp6ServiceBindingProtocolGuid;
    TcpServiceBindingGuid = &gEfiTcp6ServiceBindingProtocolGuid;
  }

  Status = gBS->OpenProtocol (
                  Controller,
                  TcpServiceBindingGuid,
                  NULL,
                  Image,
                  Controller,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );
  if (!EFI_ERROR (Status)) {
    return EFI_ALREADY_STARTED;
  }

  Status = gBS->OpenProtocol (
                  Controller,
                  IpServiceBindingGuid,
                  NULL,
                  Image,
                  Controller,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return EFI_UNSUPPORTED;
  }

  //
  // Create the TCP service data.
  //
  TcpServiceData = AllocateZeroPool (sizeof (TCP_SERVICE_DATA));
  if (TcpServiceData == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  TcpServiceData->Signature            = TCP_DRIVER_SIGNATURE;
  TcpServiceData->ControllerHandle     = Controller;
  TcpServiceData->DriverBindingHandle  = Image;
  TcpServiceData->IpVersion            = IpVersion;
  CopyMem (
    &TcpServiceData->ServiceBinding,
    &gTcpServiceBinding,
    sizeof (EFI_SERVICE_BINDING_PROTOCOL)
    );

  TcpServiceData->IpIo = IpIoCreate (Image, Controller, IpVersion);
  if (TcpServiceData->IpIo == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto ON_ERROR;
  }


  InitializeListHead (&TcpServiceData->SocketList);
  ZeroMem (&OpenData, sizeof (IP_IO_OPEN_DATA));

  if (IpVersion == IP_VERSION_4) {
    CopyMem (
      &OpenData.IpConfigData.Ip4CfgData,
      &mIp4IoDefaultIpConfigData,
      sizeof (EFI_IP4_CONFIG_DATA)
      );
    OpenData.IpConfigData.Ip4CfgData.DefaultProtocol = EFI_IP_PROTO_TCP;
  } else {
    CopyMem (
      &OpenData.IpConfigData.Ip6CfgData,
      &mIp6IoDefaultIpConfigData,
      sizeof (EFI_IP6_CONFIG_DATA)
      );
    OpenData.IpConfigData.Ip6CfgData.DefaultProtocol = EFI_IP_PROTO_TCP;
  }

  OpenData.PktRcvdNotify  = TcpRxCallback;
  Status                  = IpIoOpen (TcpServiceData->IpIo, &OpenData);
  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  Status = TcpCreateTimer ();
  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  Status = gBS->InstallMultipleProtocolInterfaces (
                  &Controller,
                  TcpServiceBindingGuid,
                  &TcpServiceData->ServiceBinding,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    TcpDestroyTimer ();

    goto ON_ERROR;
  }

  TcpSetVariableData (TcpServiceData);

  return EFI_SUCCESS;

ON_ERROR:

  if (TcpServiceData->IpIo != NULL) {
    IpIoDestroy (TcpServiceData->IpIo);
  }

  FreePool (TcpServiceData);

  return Status;
}

/**
  Destroy a TCP6 or TCP4 service binding instance. It will release all
  the resources allocated by the instance.

  @param[in]  Controller         Controller handle of device to bind driver to.
  @param[in]  ImageHandle        The TCP driver's image handle.
  @param[in]  NumberOfChildren    Number of Handles in ChildHandleBuffer. If number
                                 of children is zero stop the entire bus driver.
  @param[in]  IpVersion          IP_VERSION_4 or IP_VERSION_6

  @retval EFI_SUCCESS            The resources used by the instance were cleaned up.
  @retval Others                 Failed to clean up some of the resources.

**/
EFI_STATUS
TcpDestroyService (
  IN EFI_HANDLE  Controller,
  IN EFI_HANDLE  ImageHandle,
  IN UINTN       NumberOfChildren,
  IN UINT8       IpVersion
  )
{
  EFI_HANDLE                    NicHandle;
  EFI_GUID                      *IpProtocolGuid;
  EFI_GUID                      *ServiceBindingGuid;
  EFI_SERVICE_BINDING_PROTOCOL  *ServiceBinding;
  TCP_SERVICE_DATA              *TcpServiceData;
  EFI_STATUS                    Status;
  SOCKET                        *Sock;

  ASSERT ((IpVersion == IP_VERSION_4) || (IpVersion == IP_VERSION_6));

  if (IpVersion == IP_VERSION_4) {
    IpProtocolGuid     = &gEfiIp4ProtocolGuid;
    ServiceBindingGuid = &gEfiTcp4ServiceBindingProtocolGuid;
  } else {
    IpProtocolGuid     = &gEfiIp6ProtocolGuid;
    ServiceBindingGuid = &gEfiTcp6ServiceBindingProtocolGuid;
  }

  NicHandle = NetLibGetNicHandle (Controller, IpProtocolGuid);
  if (NicHandle == NULL) {
    return EFI_NOT_FOUND;
  }

  Status = gBS->OpenProtocol (
                  NicHandle,
                  ServiceBindingGuid,
                  (VOID **) &ServiceBinding,
                  ImageHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return EFI_DEVICE_ERROR;
  }

  TcpServiceData = TCP_SERVICE_FROM_THIS (ServiceBinding);

  if (NumberOfChildren == 0) {
    //
    // Uninstall TCP servicebinding protocol
    //
    gBS->UninstallMultipleProtocolInterfaces (
           NicHandle,
           ServiceBindingGuid,
           ServiceBinding,
           NULL
           );

    //
    // Destroy the IpIO consumed by TCP driver
    //
    IpIoDestroy (TcpServiceData->IpIo);

    //
    // Destroy the heartbeat timer.
    //
    TcpDestroyTimer ();

    //
    // Clear the variable.
    //
    TcpClearVariableData (TcpServiceData);

    //
    // Release the TCP service data
    //
    FreePool (TcpServiceData);
  } else {

    while (!IsListEmpty (&TcpServiceData->SocketList)) {
      Sock = NET_LIST_HEAD (&TcpServiceData->SocketList, SOCKET, Link);

      ServiceBinding->DestroyChild (ServiceBinding, Sock->SockHandle);
    }
  }

  return EFI_SUCCESS;
}

/**
  Test to see if this driver supports ControllerHandle.

  @param[in]  This                Protocol instance pointer.
  @param[in]  ControllerHandle    Handle of device to test.
  @param[in]  RemainingDevicePath Optional parameter use to pick a specific
                                  child device to start.

  @retval EFI_SUCCESS             This driver supports this device.
  @retval EFI_ALREADY_STARTED     This driver is already running on this device.
  @retval other                   This driver does not support this device.

**/
EFI_STATUS
EFIAPI
TcpDriverBindingSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   ControllerHandle,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL
  )
{
  EFI_STATUS  Status;
  BOOLEAN     IsTcp4Started;

  //
  // Test for the Tcp4ServiceBinding Protocol
  //
  Status = gBS->OpenProtocol (
                  ControllerHandle,
                  &gEfiTcp4ServiceBindingProtocolGuid,
                  NULL,
                  This->DriverBindingHandle,
                  ControllerHandle,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    //
    // Test for the Ip4ServiceBinding Protocol
    //
    Status = gBS->OpenProtocol (
                    ControllerHandle,
                    &gEfiIp4ServiceBindingProtocolGuid,
                    NULL,
                    This->DriverBindingHandle,
                    ControllerHandle,
                    EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                    );
    if (!EFI_ERROR (Status)) {
      return EFI_SUCCESS;
    }

    IsTcp4Started = FALSE;
  } else {
    IsTcp4Started = TRUE;
  }

  //
  // Check the Tcp6ServiceBinding Protocol
  //
  Status = gBS->OpenProtocol (
                  ControllerHandle,
                  &gEfiTcp6ServiceBindingProtocolGuid,
                  NULL,
                  This->DriverBindingHandle,
                  ControllerHandle,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    //
    // Test for the Ip6ServiceBinding Protocol
    //
    Status = gBS->OpenProtocol (
                    ControllerHandle,
                    &gEfiIp6ServiceBindingProtocolGuid,
                    NULL,
                    This->DriverBindingHandle,
                    ControllerHandle,
                    EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                    );
    if (!EFI_ERROR (Status)) {
      return EFI_SUCCESS;
    }
  } else if (IsTcp4Started) {
    return EFI_ALREADY_STARTED;
  }

  return EFI_UNSUPPORTED;
}

/**
  Start this driver on ControllerHandle.

  @param[in]  This                   Protocol instance pointer.
  @param[in]  ControllerHandle       Handle of device to bind driver to.
  @param[in]  RemainingDevicePath    Optional parameter use to pick a specific child
                                     device to start.

  @retval EFI_SUCCESS            The driver is added to ControllerHandle.
  @retval EFI_OUT_OF_RESOURCES   There are not enough resources to start the
                                 driver.
  @retval other                  The driver cannot be added to ControllerHandle.

**/
EFI_STATUS
EFIAPI
TcpDriverBindingStart (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   ControllerHandle,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL
  )
{
  EFI_STATUS  Tcp4Status;
  EFI_STATUS  Tcp6Status;

  Tcp4Status = TcpCreateService (ControllerHandle, This->DriverBindingHandle, IP_VERSION_4);
  if ((Tcp4Status == EFI_ALREADY_STARTED) || (Tcp4Status == EFI_UNSUPPORTED)) {
    Tcp4Status = EFI_SUCCESS;
  }

  Tcp6Status = TcpCreateService (ControllerHandle, This->DriverBindingHandle, IP_VERSION_6);
  if ((Tcp6Status == EFI_ALREADY_STARTED) || (Tcp6Status == EFI_UNSUPPORTED)) {
    Tcp6Status = EFI_SUCCESS;
  }

  if (!EFI_ERROR (Tcp4Status) || !EFI_ERROR (Tcp6Status)) {
    return EFI_SUCCESS;
  } else if (EFI_ERROR (Tcp4Status)) {
    return Tcp4Status;
  } else {
    return Tcp6Status;
  }
}

/**
  Stop this driver on ControllerHandle.

  @param[in]  This              A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
  @param[in]  ControllerHandle  A handle to the device being stopped. The handle must
                                support a bus specific I/O protocol for the driver
                                to use to stop the device.
  @param[in]  NumberOfChildren  The number of child device handles in ChildHandleBuffer.
  @param[in]  ChildHandleBuffer An array of child handles to be freed. May be NULL
                                if NumberOfChildren is 0.

  @retval EFI_SUCCESS           The device was stopped.
  @retval EFI_DEVICE_ERROR      The device could not be stopped due to a device error.

**/
EFI_STATUS
EFIAPI
TcpDriverBindingStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN  EFI_HANDLE                   ControllerHandle,
  IN  UINTN                        NumberOfChildren,
  IN  EFI_HANDLE                   *ChildHandleBuffer OPTIONAL
  )
{
  EFI_STATUS  Tcp4Status;
  EFI_STATUS  Tcp6Status;

  Tcp4Status = TcpDestroyService (
                 ControllerHandle,
                 This->DriverBindingHandle,
                 NumberOfChildren,
                 IP_VERSION_4
                 );

  Tcp6Status = TcpDestroyService (
                 ControllerHandle,
                 This->DriverBindingHandle,
                 NumberOfChildren,
                 IP_VERSION_6
                 );

  if (EFI_ERROR (Tcp4Status) && EFI_ERROR (Tcp6Status)) {
    return EFI_DEVICE_ERROR;
  } else {
    return EFI_SUCCESS;
  }
}

/**
  The Callback funtion called after the TCP socket was created.

  @param[in]  This            Pointer to the socket just created
  @param[in]  Context         Context of the socket

  @retval EFI_SUCCESS         This protocol installed successfully.
  @retval other               An error occured.

**/
EFI_STATUS
TcpCreateSocketCallback (
  IN SOCKET  *This,
  IN VOID    *Context
  )
{
  EFI_STATUS        Status;
  TCP_SERVICE_DATA  *TcpServiceData;
  EFI_GUID          *IpProtocolGuid;
  VOID              *Ip;

  if (This->IpVersion == IP_VERSION_4) {
    IpProtocolGuid = &gEfiIp4ProtocolGuid;
  } else {
    IpProtocolGuid = &gEfiIp6ProtocolGuid;
  }

  TcpServiceData = ((TCP_PROTO_DATA *) This->ProtoReserved)->TcpService;

  //
  // Open the default IP protocol of IP_IO BY_DRIVER.
  //
  Status = gBS->OpenProtocol (
                  TcpServiceData->IpIo->ChildHandle,
                  IpProtocolGuid,
                  &Ip,
                  TcpServiceData->DriverBindingHandle,
                  This->SockHandle,
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Open the device path on the handle where service binding resides on.
  //
  Status = gBS->OpenProtocol (
                  TcpServiceData->ControllerHandle,
                  &gEfiDevicePathProtocolGuid,
                  (VOID **) &This->ParentDevicePath,
                  TcpServiceData->DriverBindingHandle,
                  This->SockHandle,
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                  );
  if (EFI_ERROR (Status)) {
    gBS->CloseProtocol (
           TcpServiceData->IpIo->ChildHandle,
           IpProtocolGuid,
           TcpServiceData->DriverBindingHandle,
           This->SockHandle
           );
  } else {
    //
    // Insert this socket into the SocketList.
    //
    InsertTailList (&TcpServiceData->SocketList, &This->Link);
  }

  return Status;
}

/**
  The callback function called before the TCP socket was to be destroyed.

  @param[in]  This                   The TCP socket to be destroyed.
  @param[in]  Context                The context of the socket.

**/
VOID
TcpDestroySocketCallback (
  IN SOCKET  *This,
  IN VOID    *Context
  )
{
  TCP_SERVICE_DATA  *TcpServiceData;
  EFI_GUID          *IpProtocolGuid;

  if (This->IpVersion == IP_VERSION_4) {
    IpProtocolGuid = &gEfiIp4ProtocolGuid;
  } else {
    IpProtocolGuid = &gEfiIp6ProtocolGuid;
  }

  TcpServiceData = ((TCP_PROTO_DATA *) This->ProtoReserved)->TcpService;

  //
  // Remove this node from the list.
  //
  RemoveEntryList (&This->Link);

  //
  // Close the device path protocol
  //
  gBS->CloseProtocol (
         TcpServiceData->ControllerHandle,
         &gEfiDevicePathProtocolGuid,
         TcpServiceData->DriverBindingHandle,
         This->SockHandle
         );

  //
  // Close the IP protocol.
  //
  gBS->CloseProtocol (
         TcpServiceData->IpIo->ChildHandle,
         IpProtocolGuid,
         TcpServiceData->DriverBindingHandle,
         This->SockHandle
         );
}

/**
  Creates a child handle with a set of TCP services.

  The CreateChild() function installs a protocol on ChildHandle.
  If ChildHandle is a pointer to NULL, then a new handle is created and returned in ChildHandle.
  If ChildHandle is not a pointer to NULL, then the protocol installs on the existing ChildHandle.

  @param[in]      This          Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
  @param[in, out] ChildHandle   Pointer to the handle of the child to create.
                                If it is NULL, then a new handle is created.
                                If it is a pointer to an existing UEFI handle,
                                then the protocol is added to the existing UEFI handle.

  @retval EFI_SUCCES            The protocol was added to ChildHandle.
  @retval EFI_INVALID_PARAMETER ChildHandle is NULL.
  @retval EFI_OUT_OF_RESOURCES  There are not enough resources availabe to create
                                the child.
  @retval other                 The child handle was not created.

**/
EFI_STATUS
EFIAPI
TcpServiceBindingCreateChild (
  IN     EFI_SERVICE_BINDING_PROTOCOL  *This,
  IN OUT EFI_HANDLE                    *ChildHandle
  )
{
  SOCKET            *Sock;
  TCP_SERVICE_DATA  *TcpServiceData;
  TCP_PROTO_DATA    TcpProto;
  EFI_STATUS        Status;
  EFI_TPL           OldTpl;

  if (NULL == This || NULL == ChildHandle) {
    return EFI_INVALID_PARAMETER;
  }

  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);

  Status              = EFI_SUCCESS;
  TcpServiceData      = TCP_SERVICE_FROM_THIS (This);
  TcpProto.TcpService = TcpServiceData;
  TcpProto.TcpPcb     = NULL;

  //
  // Create a tcp instance with defualt Tcp default
  // sock init data and TcpProto
  //
  mTcpDefaultSockData.ProtoData     = &TcpProto;
  mTcpDefaultSockData.DataSize      = sizeof (TCP_PROTO_DATA);
  mTcpDefaultSockData.DriverBinding = TcpServiceData->DriverBindingHandle;
  mTcpDefaultSockData.IpVersion     = TcpServiceData->IpVersion;

  if (TcpServiceData->IpVersion == IP_VERSION_4) {
    mTcpDefaultSockData.Protocol = &gTcp4ProtocolTemplate;
  } else {
    mTcpDefaultSockData.Protocol = &gTcp6ProtocolTemplate;
  }

  Sock = SockCreateChild (&mTcpDefaultSockData);
  if (NULL == Sock) {
    DEBUG (
      (EFI_D_ERROR,
      "TcpDriverBindingCreateChild: No resource to create a Tcp Child\n")
      );

    Status = EFI_OUT_OF_RESOURCES;
  } else {
    *ChildHandle = Sock->SockHandle;
  }

  mTcpDefaultSockData.ProtoData  = NULL;

  gBS->RestoreTPL (OldTpl);
  return Status;
}

/**
  Destroys a child handle with a set of TCP services.

  The DestroyChild() function does the opposite of CreateChild(). It removes a protocol
  that was installed by CreateChild() from ChildHandle. If the removed protocol is the
  last protocol on ChildHandle, then ChildHandle is destroyed.

  @param  This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
  @param  ChildHandle Handle of the child to be destroyed.

  @retval EFI_SUCCES            The protocol was removed from ChildHandle.
  @retval EFI_UNSUPPORTED       ChildHandle does not support the protocol that is being removed.
  @retval EFI_INVALID_PARAMETER Child handle is not a valid UEFI Handle.
  @retval EFI_ACCESS_DENIED     The protocol could not be removed from the ChildHandle
                                because its services are being used.
  @retval other                 The child handle was not destroyed.

**/
EFI_STATUS
EFIAPI
TcpServiceBindingDestroyChild (
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                    ChildHandle
  )
{
  EFI_STATUS  Status;
  VOID        *Tcp;
  SOCKET      *Sock;
  EFI_TPL     OldTpl;

  if (NULL == This || NULL == ChildHandle) {
    return EFI_INVALID_PARAMETER;
  }

  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);

  //
  // retrieve the Tcp4 protocol from ChildHandle
  //
  Status = gBS->OpenProtocol (
                  ChildHandle,
                  &gEfiTcp4ProtocolGuid,
                  &Tcp,
                  gTcpDriverBinding.DriverBindingHandle,
                  ChildHandle,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    //
    // No Tcp4, try the Tcp6 protocol
    //
    Status = gBS->OpenProtocol (
                    ChildHandle,
                    &gEfiTcp6ProtocolGuid,
                    &Tcp,
                    gTcpDriverBinding.DriverBindingHandle,
                    ChildHandle,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );
    if (EFI_ERROR (Status)) {
      Status = EFI_UNSUPPORTED;
    }
  }

  if (!EFI_ERROR (Status)) {
    //
    // destroy this sock and related Tcp protocol control
    // block
    //
    Sock = SOCK_FROM_THIS (Tcp);

    SockDestroyChild (Sock);
  }

  gBS->RestoreTPL (OldTpl);

  return Status;
}