summaryrefslogtreecommitdiffstats
path: root/NetworkPkg/HttpBootDxe/HttpBootClient.c
blob: 30ac15889b06b88be25c577f5f8a071d15e73e08 (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
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
/** @file
  Implementation of the boot file download function.

Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "HttpBootDxe.h"

/**
  Update the device path node to include the boot resource information.

  @param[in]    Private            The pointer to the driver's private data.

  @retval EFI_SUCCESS              Device patch successfully updated.
  @retval EFI_OUT_OF_RESOURCES     Could not allocate needed resources.
  @retval Others                   Unexpected error happened.

**/
EFI_STATUS
HttpBootUpdateDevicePath (
  IN   HTTP_BOOT_PRIVATE_DATA   *Private
  )
{
  EFI_DEV_PATH               *Node;
  EFI_DEVICE_PATH_PROTOCOL   *TmpIpDevicePath;
  EFI_DEVICE_PATH_PROTOCOL   *TmpDnsDevicePath;
  EFI_DEVICE_PATH_PROTOCOL   *NewDevicePath;
  UINTN                      Length;
  EFI_STATUS                 Status;

  TmpIpDevicePath  = NULL;
  TmpDnsDevicePath = NULL;

  //
  // Update the IP node with DHCP assigned information.
  //
  if (!Private->UsingIpv6) {
    Node = AllocateZeroPool (sizeof (IPv4_DEVICE_PATH));
    if (Node == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
    Node->Ipv4.Header.Type    = MESSAGING_DEVICE_PATH;
    Node->Ipv4.Header.SubType = MSG_IPv4_DP;
    SetDevicePathNodeLength (Node, sizeof (IPv4_DEVICE_PATH));
    CopyMem (&Node->Ipv4.LocalIpAddress, &Private->StationIp, sizeof (EFI_IPv4_ADDRESS));
    Node->Ipv4.RemotePort      = Private->Port;
    Node->Ipv4.Protocol        = EFI_IP_PROTO_TCP;
    Node->Ipv4.StaticIpAddress = FALSE;
    CopyMem (&Node->Ipv4.GatewayIpAddress, &Private->GatewayIp, sizeof (EFI_IPv4_ADDRESS));
    CopyMem (&Node->Ipv4.SubnetMask, &Private->SubnetMask, sizeof (EFI_IPv4_ADDRESS));
  } else {
    Node = AllocateZeroPool (sizeof (IPv6_DEVICE_PATH));
    if (Node == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
    Node->Ipv6.Header.Type     = MESSAGING_DEVICE_PATH;
    Node->Ipv6.Header.SubType  = MSG_IPv6_DP;
    SetDevicePathNodeLength (Node, sizeof (IPv6_DEVICE_PATH));
    Node->Ipv6.PrefixLength    = IP6_PREFIX_LENGTH;
    Node->Ipv6.RemotePort      = Private->Port;
    Node->Ipv6.Protocol        = EFI_IP_PROTO_TCP;
    Node->Ipv6.IpAddressOrigin = 0;
    CopyMem (&Node->Ipv6.LocalIpAddress, &Private->StationIp.v6, sizeof (EFI_IPv6_ADDRESS));
    CopyMem (&Node->Ipv6.RemoteIpAddress, &Private->ServerIp.v6, sizeof (EFI_IPv6_ADDRESS));
    CopyMem (&Node->Ipv6.GatewayIpAddress, &Private->GatewayIp.v6, sizeof (EFI_IPv6_ADDRESS));
  }

  TmpIpDevicePath = AppendDevicePathNode (Private->ParentDevicePath, (EFI_DEVICE_PATH_PROTOCOL*) Node);
  FreePool (Node);
  if (TmpIpDevicePath == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  //
  // Update the DNS node with DNS server IP list if existed.
  //
  if (Private->DnsServerIp != NULL) {
    Length = sizeof (EFI_DEVICE_PATH_PROTOCOL) + sizeof (Node->Dns.IsIPv6) + Private->DnsServerCount * sizeof (EFI_IP_ADDRESS);
    Node = AllocatePool (Length);
    if (Node == NULL) {
      FreePool (TmpIpDevicePath);
      return EFI_OUT_OF_RESOURCES;
    }
    Node->DevPath.Type    = MESSAGING_DEVICE_PATH;
    Node->DevPath.SubType = MSG_DNS_DP;
    SetDevicePathNodeLength (Node, Length);
    Node->Dns.IsIPv6 = Private->UsingIpv6 ? 0x01 : 0x00;
    CopyMem ((UINT8*) Node + sizeof (EFI_DEVICE_PATH_PROTOCOL) + sizeof (Node->Dns.IsIPv6), Private->DnsServerIp, Private->DnsServerCount * sizeof (EFI_IP_ADDRESS));

    TmpDnsDevicePath = AppendDevicePathNode (TmpIpDevicePath, (EFI_DEVICE_PATH_PROTOCOL*) Node);
    FreePool (Node);
    FreePool (TmpIpDevicePath);
    TmpIpDevicePath = NULL;
    if (TmpDnsDevicePath == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
  }

  //
  // Update the URI node with the boot file URI.
  //
  Length = sizeof (EFI_DEVICE_PATH_PROTOCOL) + AsciiStrSize (Private->BootFileUri);
  Node = AllocatePool (Length);
  if (Node == NULL) {
    if (TmpIpDevicePath != NULL) {
      FreePool (TmpIpDevicePath);
    }
    if (TmpDnsDevicePath != NULL) {
      FreePool (TmpDnsDevicePath);
    }
    return EFI_OUT_OF_RESOURCES;
  }
  Node->DevPath.Type    = MESSAGING_DEVICE_PATH;
  Node->DevPath.SubType = MSG_URI_DP;
  SetDevicePathNodeLength (Node, Length);
  CopyMem ((UINT8*) Node + sizeof (EFI_DEVICE_PATH_PROTOCOL), Private->BootFileUri, AsciiStrSize (Private->BootFileUri));

  if (TmpDnsDevicePath != NULL) {
    NewDevicePath = AppendDevicePathNode (TmpDnsDevicePath, (EFI_DEVICE_PATH_PROTOCOL*) Node);
    FreePool (TmpDnsDevicePath);
  } else {
    ASSERT (TmpIpDevicePath != NULL);
    NewDevicePath = AppendDevicePathNode (TmpIpDevicePath, (EFI_DEVICE_PATH_PROTOCOL*) Node);
    FreePool (TmpIpDevicePath);
  }
  FreePool (Node);
  if (NewDevicePath == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  if (!Private->UsingIpv6) {
    //
    // Reinstall the device path protocol of the child handle.
    //
    Status = gBS->ReinstallProtocolInterface (
                    Private->Ip4Nic->Controller,
                    &gEfiDevicePathProtocolGuid,
                    Private->Ip4Nic->DevicePath,
                    NewDevicePath
                    );
    if (EFI_ERROR (Status)) {
      return Status;
    }

    FreePool (Private->Ip4Nic->DevicePath);
    Private->Ip4Nic->DevicePath = NewDevicePath;
  } else {
    //
    // Reinstall the device path protocol of the child handle.
    //
    Status = gBS->ReinstallProtocolInterface (
                    Private->Ip6Nic->Controller,
                    &gEfiDevicePathProtocolGuid,
                    Private->Ip6Nic->DevicePath,
                    NewDevicePath
                    );
    if (EFI_ERROR (Status)) {
      return Status;
    }
    FreePool (Private->Ip6Nic->DevicePath);
    Private->Ip6Nic->DevicePath = NewDevicePath;
  }

  return EFI_SUCCESS;
}

/**
  Parse the boot file URI information from the selected Dhcp4 offer packet.

  @param[in]    Private        The pointer to the driver's private data.

  @retval EFI_SUCCESS          Successfully parsed out all the boot information.
  @retval Others               Failed to parse out the boot information.

**/
EFI_STATUS
HttpBootDhcp4ExtractUriInfo (
  IN     HTTP_BOOT_PRIVATE_DATA   *Private
  )
{
  HTTP_BOOT_DHCP4_PACKET_CACHE    *SelectOffer;
  HTTP_BOOT_DHCP4_PACKET_CACHE    *HttpOffer;
  UINT32                          SelectIndex;
  UINT32                          ProxyIndex;
  UINT32                          DnsServerIndex;
  EFI_DHCP4_PACKET_OPTION         *Option;
  EFI_STATUS                      Status;

  ASSERT (Private != NULL);
  ASSERT (Private->SelectIndex != 0);
  SelectIndex = Private->SelectIndex - 1;
  ASSERT (SelectIndex < HTTP_BOOT_OFFER_MAX_NUM);

  DnsServerIndex = 0;

  Status = EFI_SUCCESS;

  //
  // SelectOffer contains the IP address configuration and name server configuration.
  // HttpOffer contains the boot file URL.
  //
  SelectOffer = &Private->OfferBuffer[SelectIndex].Dhcp4;
  if (Private->FilePathUri == NULL) {
    //
    // In Corporate environment, we need a HttpOffer.
    //
    if ((SelectOffer->OfferType == HttpOfferTypeDhcpIpUri) ||
        (SelectOffer->OfferType == HttpOfferTypeDhcpIpUriDns) ||
        (SelectOffer->OfferType == HttpOfferTypeDhcpNameUriDns)) {
      HttpOffer = SelectOffer;
    } else {
      ASSERT (Private->SelectProxyType != HttpOfferTypeMax);
      ProxyIndex = Private->OfferIndex[Private->SelectProxyType][0];
      HttpOffer = &Private->OfferBuffer[ProxyIndex].Dhcp4;
    }
    Private->BootFileUriParser = HttpOffer->UriParser;
    Private->BootFileUri = (CHAR8*) HttpOffer->OptList[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE]->Data;
  } else {
    //
    // In Home environment the BootFileUri comes from the FilePath.
    //
    Private->BootFileUriParser = Private->FilePathUriParser;
    Private->BootFileUri = Private->FilePathUri;
  }

  //
  // Check the URI scheme.
  //
  Status = HttpBootCheckUriScheme (Private->BootFileUri);
  if (EFI_ERROR (Status)) {
    DEBUG ((EFI_D_ERROR, "HttpBootDhcp4ExtractUriInfo: %r.\n", Status));
    if (Status == EFI_INVALID_PARAMETER) {
      AsciiPrint ("\n  Error: Invalid URI address.\n");
    } else if (Status == EFI_ACCESS_DENIED) {
      AsciiPrint ("\n  Error: Access forbidden, only HTTPS connection is allowed.\n");
    }
    return Status;
  }

  if ((SelectOffer->OfferType == HttpOfferTypeDhcpNameUriDns) ||
      (SelectOffer->OfferType == HttpOfferTypeDhcpDns) ||
      (SelectOffer->OfferType == HttpOfferTypeDhcpIpUriDns)) {
    Option = SelectOffer->OptList[HTTP_BOOT_DHCP4_TAG_INDEX_DNS_SERVER];
    ASSERT (Option != NULL);

    //
    // Record the Dns Server address list.
    //
    Private->DnsServerCount = (Option->Length) / sizeof (EFI_IPv4_ADDRESS);

    Private->DnsServerIp = AllocateZeroPool (Private->DnsServerCount * sizeof (EFI_IP_ADDRESS));
    if (Private->DnsServerIp == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }

    for (DnsServerIndex = 0; DnsServerIndex < Private->DnsServerCount; DnsServerIndex++) {
      CopyMem (&(Private->DnsServerIp[DnsServerIndex].v4), &(((EFI_IPv4_ADDRESS *) Option->Data)[DnsServerIndex]), sizeof (EFI_IPv4_ADDRESS));
    }

    //
    // Configure the default DNS server if server assigned.
    //
    Status = HttpBootRegisterIp4Dns (
               Private,
               Option->Length,
               Option->Data
               );
    if (EFI_ERROR (Status)) {
      FreePool (Private->DnsServerIp);
      Private->DnsServerIp = NULL;
      return Status;
    }
  }

  //
  // Extract the port from URL, and use default HTTP port 80 if not provided.
  //
  Status = HttpUrlGetPort (
             Private->BootFileUri,
             Private->BootFileUriParser,
             &Private->Port
             );
  if (EFI_ERROR (Status) || Private->Port == 0) {
    Private->Port = 80;
  }

  //
  // All boot informations are valid here.
  //

  //
  // Update the device path to include the boot resource information.
  //
  Status = HttpBootUpdateDevicePath (Private);
  if (EFI_ERROR (Status) && Private->DnsServerIp != NULL) {
    FreePool (Private->DnsServerIp);
    Private->DnsServerIp = NULL;
  }

  return Status;
}

/**
  Parse the boot file URI information from the selected Dhcp6 offer packet.

  @param[in]    Private        The pointer to the driver's private data.

  @retval EFI_SUCCESS          Successfully parsed out all the boot information.
  @retval Others               Failed to parse out the boot information.

**/
EFI_STATUS
HttpBootDhcp6ExtractUriInfo (
  IN     HTTP_BOOT_PRIVATE_DATA   *Private
  )
{
  HTTP_BOOT_DHCP6_PACKET_CACHE    *SelectOffer;
  HTTP_BOOT_DHCP6_PACKET_CACHE    *HttpOffer;
  UINT32                          SelectIndex;
  UINT32                          ProxyIndex;
  UINT32                          DnsServerIndex;
  EFI_DHCP6_PACKET_OPTION         *Option;
  EFI_IPv6_ADDRESS                IpAddr;
  CHAR8                           *HostName;
  UINTN                           HostNameSize;
  CHAR16                          *HostNameStr;
  EFI_STATUS                      Status;

  ASSERT (Private != NULL);
  ASSERT (Private->SelectIndex != 0);
  SelectIndex = Private->SelectIndex - 1;
  ASSERT (SelectIndex < HTTP_BOOT_OFFER_MAX_NUM);

  DnsServerIndex = 0;

  Status   = EFI_SUCCESS;
  HostName = NULL;
  //
  // SelectOffer contains the IP address configuration and name server configuration.
  // HttpOffer contains the boot file URL.
  //
  SelectOffer = &Private->OfferBuffer[SelectIndex].Dhcp6;
  if (Private->FilePathUri == NULL) {
    //
    // In Corporate environment, we need a HttpOffer.
    //
    if ((SelectOffer->OfferType == HttpOfferTypeDhcpIpUri) ||
        (SelectOffer->OfferType == HttpOfferTypeDhcpIpUriDns) ||
        (SelectOffer->OfferType == HttpOfferTypeDhcpNameUriDns)) {
      HttpOffer = SelectOffer;
    } else {
      ASSERT (Private->SelectProxyType != HttpOfferTypeMax);
      ProxyIndex = Private->OfferIndex[Private->SelectProxyType][0];
      HttpOffer = &Private->OfferBuffer[ProxyIndex].Dhcp6;
    }
    Private->BootFileUriParser = HttpOffer->UriParser;
    Private->BootFileUri = (CHAR8*) HttpOffer->OptList[HTTP_BOOT_DHCP6_IDX_BOOT_FILE_URL]->Data;
  } else {
    //
    // In Home environment the BootFileUri comes from the FilePath.
    //
    Private->BootFileUriParser = Private->FilePathUriParser;
    Private->BootFileUri = Private->FilePathUri;
  }

  //
  // Check the URI scheme.
  //
  Status = HttpBootCheckUriScheme (Private->BootFileUri);
  if (EFI_ERROR (Status)) {
    DEBUG ((EFI_D_ERROR, "HttpBootDhcp6ExtractUriInfo: %r.\n", Status));
    if (Status == EFI_INVALID_PARAMETER) {
      AsciiPrint ("\n  Error: Invalid URI address.\n");
    } else if (Status == EFI_ACCESS_DENIED) {
      AsciiPrint ("\n  Error: Access forbidden, only HTTPS connection is allowed.\n");
    }
    return Status;
  }

  //
  //  Set the Local station address to IP layer.
  //
  Status = HttpBootSetIp6Address (Private);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Register the IPv6 gateway address to the network device.
  //
  Status = HttpBootSetIp6Gateway (Private);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if ((SelectOffer->OfferType == HttpOfferTypeDhcpNameUriDns) ||
      (SelectOffer->OfferType == HttpOfferTypeDhcpDns) ||
      (SelectOffer->OfferType == HttpOfferTypeDhcpIpUriDns)) {
    Option = SelectOffer->OptList[HTTP_BOOT_DHCP6_IDX_DNS_SERVER];
    ASSERT (Option != NULL);

    //
    // Record the Dns Server address list.
    //
    Private->DnsServerCount = HTONS (Option->OpLen) / sizeof (EFI_IPv6_ADDRESS);

    Private->DnsServerIp = AllocateZeroPool (Private->DnsServerCount * sizeof (EFI_IP_ADDRESS));
    if (Private->DnsServerIp == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }

    for (DnsServerIndex = 0; DnsServerIndex < Private->DnsServerCount; DnsServerIndex++) {
      CopyMem (&(Private->DnsServerIp[DnsServerIndex].v6), &(((EFI_IPv6_ADDRESS *) Option->Data)[DnsServerIndex]), sizeof (EFI_IPv6_ADDRESS));
    }

    //
    // Configure the default DNS server if server assigned.
    //
    Status = HttpBootSetIp6Dns (
               Private,
               HTONS (Option->OpLen),
               Option->Data
               );
    if (EFI_ERROR (Status)) {
      goto Error;
    }
  }

  //
  // Extract the HTTP server Ip from URL. This is used to Check route table
  // whether can send message to HTTP Server Ip through the GateWay.
  //
  Status = HttpUrlGetIp6 (
             Private->BootFileUri,
             Private->BootFileUriParser,
             &IpAddr
             );

  if (EFI_ERROR (Status)) {
    //
    // The Http server address is expressed by Name Ip, so perform DNS resolution
    //
    Status = HttpUrlGetHostName (
               Private->BootFileUri,
               Private->BootFileUriParser,
               &HostName
               );
    if (EFI_ERROR (Status)) {
      goto Error;
    }

    HostNameSize = AsciiStrSize (HostName);
    HostNameStr = AllocateZeroPool (HostNameSize * sizeof (CHAR16));
    if (HostNameStr == NULL) {
      Status = EFI_OUT_OF_RESOURCES;
      goto Error;
    }

    AsciiStrToUnicodeStrS (HostName, HostNameStr, HostNameSize);

    if (HostName != NULL) {
      FreePool (HostName);
    }

    Status = HttpBootDns (Private, HostNameStr, &IpAddr);
    FreePool (HostNameStr);
    if (EFI_ERROR (Status)) {
      AsciiPrint ("\n  Error: Could not retrieve the host address from DNS server.\n");
      goto Error;
    }
  }

  CopyMem (&Private->ServerIp.v6, &IpAddr, sizeof (EFI_IPv6_ADDRESS));

  //
  // Extract the port from URL, and use default HTTP port 80 if not provided.
  //
  Status = HttpUrlGetPort (
             Private->BootFileUri,
             Private->BootFileUriParser,
             &Private->Port
             );
  if (EFI_ERROR (Status) || Private->Port == 0) {
    Private->Port = 80;
  }

  //
  // All boot informations are valid here.
  //

  //
  // Update the device path to include the boot resource information.
  //
  Status = HttpBootUpdateDevicePath (Private);
  if (EFI_ERROR (Status)) {
    goto Error;
  }

  return Status;

Error:
  if (Private->DnsServerIp != NULL) {
    FreePool (Private->DnsServerIp);
    Private->DnsServerIp = NULL;
  }

  return Status;
}


/**
  Discover all the boot information for boot file.

  @param[in, out]    Private        The pointer to the driver's private data.

  @retval EFI_SUCCESS          Successfully obtained all the boot information .
  @retval Others               Failed to retrieve the boot information.

**/
EFI_STATUS
HttpBootDiscoverBootInfo (
  IN OUT HTTP_BOOT_PRIVATE_DATA   *Private
  )
{
  EFI_STATUS              Status;

  //
  // Start D.O.R.A/S.A.R.R exchange to acquire station ip address and
  // other Http boot information.
  //
  Status = HttpBootDhcp (Private);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (!Private->UsingIpv6) {
    Status = HttpBootDhcp4ExtractUriInfo (Private);
  } else {
    Status = HttpBootDhcp6ExtractUriInfo (Private);
  }

  return Status;
}

/**
  HttpIo Callback function which will be invoked when specified HTTP_IO_CALLBACK_EVENT happened.

  @param[in]    EventType      Indicate the Event type that occurs in the current callback.
  @param[in]    Message        HTTP message which will be send to, or just received from HTTP server.
  @param[in]    Context        The Callback Context pointer.

  @retval EFI_SUCCESS          Tells the HttpIo to continue the HTTP process.
  @retval Others               Tells the HttpIo to abort the current HTTP process.
**/
EFI_STATUS
EFIAPI
HttpBootHttpIoCallback (
  IN  HTTP_IO_CALLBACK_EVENT    EventType,
  IN  EFI_HTTP_MESSAGE          *Message,
  IN  VOID                      *Context
  )
{
  HTTP_BOOT_PRIVATE_DATA       *Private;
  EFI_STATUS                   Status;
  Private = (HTTP_BOOT_PRIVATE_DATA *) Context;
  if (Private->HttpBootCallback != NULL) {
    Status = Private->HttpBootCallback->Callback (
               Private->HttpBootCallback,
               EventType == HttpIoRequest ? HttpBootHttpRequest : HttpBootHttpResponse,
               EventType == HttpIoRequest ? FALSE : TRUE,
               sizeof (EFI_HTTP_MESSAGE),
               (VOID *) Message
               );
    return Status;
  }
  return EFI_SUCCESS;
}

/**
  Create a HttpIo instance for the file download.

  @param[in]    Private        The pointer to the driver's private data.

  @retval EFI_SUCCESS          Successfully created.
  @retval Others               Failed to create HttpIo.

**/
EFI_STATUS
HttpBootCreateHttpIo (
  IN     HTTP_BOOT_PRIVATE_DATA       *Private
  )
{
  HTTP_IO_CONFIG_DATA          ConfigData;
  EFI_STATUS                   Status;
  EFI_HANDLE                   ImageHandle;

  ASSERT (Private != NULL);

  ZeroMem (&ConfigData, sizeof (HTTP_IO_CONFIG_DATA));
  if (!Private->UsingIpv6) {
    ConfigData.Config4.HttpVersion    = HttpVersion11;
    ConfigData.Config4.RequestTimeOut = HTTP_BOOT_REQUEST_TIMEOUT;
    IP4_COPY_ADDRESS (&ConfigData.Config4.LocalIp, &Private->StationIp.v4);
    IP4_COPY_ADDRESS (&ConfigData.Config4.SubnetMask, &Private->SubnetMask.v4);
    ImageHandle = Private->Ip4Nic->ImageHandle;
  } else {
    ConfigData.Config6.HttpVersion    = HttpVersion11;
    ConfigData.Config6.RequestTimeOut = HTTP_BOOT_REQUEST_TIMEOUT;
    IP6_COPY_ADDRESS (&ConfigData.Config6.LocalIp, &Private->StationIp.v6);
    ImageHandle = Private->Ip6Nic->ImageHandle;
  }

  Status = HttpIoCreateIo (
             ImageHandle,
             Private->Controller,
             Private->UsingIpv6 ? IP_VERSION_6 : IP_VERSION_4,
             &ConfigData,
             HttpBootHttpIoCallback,
             (VOID *) Private,
             &Private->HttpIo
             );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Private->HttpCreated = TRUE;
  return EFI_SUCCESS;
}

/**
  Release all the resource of a cache item.

  @param[in]          Cache         The pointer to the cache item.

**/
VOID
HttpBootFreeCache (
  IN  HTTP_BOOT_CACHE_CONTENT    *Cache
  )
{
  UINTN                       Index;
  LIST_ENTRY                  *Entry;
  LIST_ENTRY                  *NextEntry;
  HTTP_BOOT_ENTITY_DATA       *EntityData;

  if (Cache != NULL) {
    //
    // Free the request data
    //
    if (Cache->RequestData != NULL) {
      if (Cache->RequestData->Url != NULL) {
        FreePool (Cache->RequestData->Url);
      }
      FreePool (Cache->RequestData);
    }

    //
    // Free the response header
    //
    if (Cache->ResponseData != NULL) {
      if (Cache->ResponseData->Headers != NULL) {
        for (Index = 0; Index < Cache->ResponseData->HeaderCount; Index++) {
          FreePool (Cache->ResponseData->Headers[Index].FieldName);
          FreePool (Cache->ResponseData->Headers[Index].FieldValue);
        }
        FreePool (Cache->ResponseData->Headers);
      }
    }

    //
    // Free the response body
    //
    NET_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Cache->EntityDataList) {
      EntityData = NET_LIST_USER_STRUCT (Entry, HTTP_BOOT_ENTITY_DATA, Link);
      if (EntityData->Block != NULL) {
        FreePool (EntityData->Block);
      }
      RemoveEntryList (&EntityData->Link);
      FreePool (EntityData);
    }

    FreePool (Cache);
  }
}

/**
  Clean up all cached data.

  @param[in]          Private         The pointer to the driver's private data.

**/
VOID
HttpBootFreeCacheList (
  IN     HTTP_BOOT_PRIVATE_DATA   *Private
  )
{
  LIST_ENTRY                  *Entry;
  LIST_ENTRY                  *NextEntry;
  HTTP_BOOT_CACHE_CONTENT     *Cache;

  NET_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Private->CacheList) {
    Cache = NET_LIST_USER_STRUCT (Entry, HTTP_BOOT_CACHE_CONTENT, Link);
    RemoveEntryList (&Cache->Link);
    HttpBootFreeCache (Cache);
  }
}

/**
  Get the file content from cached data.

  @param[in]          Private         The pointer to the driver's private data.
  @param[in]          Uri             Uri of the file to be retrieved from cache.
  @param[in, out]     BufferSize      On input the size of Buffer in bytes. On output with a return
                                      code of EFI_SUCCESS, the amount of data transferred to
                                      Buffer. On output with a return code of EFI_BUFFER_TOO_SMALL,
                                      the size of Buffer required to retrieve the requested file.
  @param[out]         Buffer          The memory buffer to transfer the file to. IF Buffer is NULL,
                                      then the size of the requested file is returned in
                                      BufferSize.
  @param[out]         ImageType       The image type of the downloaded file.

  @retval EFI_SUCCESS          Successfully created.
  @retval Others               Failed to create HttpIo.

**/
EFI_STATUS
HttpBootGetFileFromCache (
  IN     HTTP_BOOT_PRIVATE_DATA   *Private,
  IN     CHAR16                   *Uri,
  IN OUT UINTN                    *BufferSize,
     OUT UINT8                    *Buffer,
     OUT HTTP_BOOT_IMAGE_TYPE     *ImageType
  )
{
  LIST_ENTRY                  *Entry;
  LIST_ENTRY                  *Entry2;
  HTTP_BOOT_CACHE_CONTENT     *Cache;
  HTTP_BOOT_ENTITY_DATA       *EntityData;
  UINTN                       CopyedSize;

  if (Uri == NULL || BufferSize == NULL || Buffer == NULL || ImageType == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  NET_LIST_FOR_EACH (Entry, &Private->CacheList) {
    Cache = NET_LIST_USER_STRUCT (Entry, HTTP_BOOT_CACHE_CONTENT, Link);
    //
    // Compare the URI to see whether we already have a cache for this file.
    //
    if ((Cache->RequestData != NULL) &&
        (Cache->RequestData->Url != NULL) &&
        (StrCmp (Uri, Cache->RequestData->Url) == 0)) {
      //
      // Hit in cache, record image type.
      //
      *ImageType  = Cache->ImageType;

      //
      // Check buffer size.
      //
      if (*BufferSize < Cache->EntityLength) {
        *BufferSize = Cache->EntityLength;
        return EFI_BUFFER_TOO_SMALL;
      }

      //
      // Fill data to buffer.
      //
      CopyedSize = 0;
      NET_LIST_FOR_EACH (Entry2, &Cache->EntityDataList) {
        EntityData = NET_LIST_USER_STRUCT (Entry2, HTTP_BOOT_ENTITY_DATA, Link);
        if (*BufferSize > CopyedSize) {
          CopyMem (
            Buffer + CopyedSize,
            EntityData->DataStart,
            MIN (EntityData->DataLength, *BufferSize - CopyedSize)
            );
          CopyedSize += MIN (EntityData->DataLength, *BufferSize - CopyedSize);
        }
      }
      *BufferSize = CopyedSize;
      return EFI_SUCCESS;
    }
  }

  return EFI_NOT_FOUND;
}

/**
  A callback function to intercept events during message parser.

  This function will be invoked during HttpParseMessageBody() with various events type. An error
  return status of the callback function will cause the HttpParseMessageBody() aborted.

  @param[in]    EventType          Event type of this callback call.
  @param[in]    Data               A pointer to data buffer.
  @param[in]    Length             Length in bytes of the Data.
  @param[in]    Context            Callback context set by HttpInitMsgParser().

  @retval EFI_SUCCESS              Continue to parser the message body.
  @retval Others                   Abort the parse.

**/
EFI_STATUS
EFIAPI
HttpBootGetBootFileCallback (
  IN HTTP_BODY_PARSE_EVENT      EventType,
  IN CHAR8                      *Data,
  IN UINTN                      Length,
  IN VOID                       *Context
  )
{
  HTTP_BOOT_CALLBACK_DATA      *CallbackData;
  HTTP_BOOT_ENTITY_DATA        *NewEntityData;
  EFI_STATUS                   Status;
  EFI_HTTP_BOOT_CALLBACK_PROTOCOL   *HttpBootCallback;

  //
  // We only care about the entity data.
  //
  if (EventType != BodyParseEventOnData) {
    return EFI_SUCCESS;
  }

  CallbackData = (HTTP_BOOT_CALLBACK_DATA *) Context;
  HttpBootCallback = CallbackData->Private->HttpBootCallback;
  if (HttpBootCallback != NULL) {
    Status = HttpBootCallback->Callback (
               HttpBootCallback,
               HttpBootHttpEntityBody,
               TRUE,
               (UINT32)Length,
               Data
               );
    if (EFI_ERROR (Status)) {
      return Status;
    }
  }
  //
  // Copy data if caller has provided a buffer.
  //
  if (CallbackData->BufferSize > CallbackData->CopyedSize) {
    CopyMem (
      CallbackData->Buffer + CallbackData->CopyedSize,
      Data,
      MIN (Length, CallbackData->BufferSize - CallbackData->CopyedSize)
      );
    CallbackData->CopyedSize += MIN (Length, CallbackData->BufferSize - CallbackData->CopyedSize);
  }

  //
  // The caller doesn't provide a buffer, save the block into cache list.
  //
  if (CallbackData->Cache != NULL) {
    NewEntityData = AllocatePool (sizeof (HTTP_BOOT_ENTITY_DATA));
    if (NewEntityData == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
    if (CallbackData->NewBlock) {
      NewEntityData->Block = CallbackData->Block;
      CallbackData->Block = NULL;
    }
    NewEntityData->DataLength = Length;
    NewEntityData->DataStart  = (UINT8*) Data;
    InsertTailList (&CallbackData->Cache->EntityDataList, &NewEntityData->Link);
  }
  return EFI_SUCCESS;
}

/**
  This function download the boot file by using UEFI HTTP protocol.

  @param[in]       Private         The pointer to the driver's private data.
  @param[in]       HeaderOnly      Only request the response header, it could save a lot of time if
                                   the caller only want to know the size of the requested file.
  @param[in, out]  BufferSize      On input the size of Buffer in bytes. On output with a return
                                   code of EFI_SUCCESS, the amount of data transferred to
                                   Buffer. On output with a return code of EFI_BUFFER_TOO_SMALL,
                                   the size of Buffer required to retrieve the requested file.
  @param[out]      Buffer          The memory buffer to transfer the file to. IF Buffer is NULL,
                                   then the size of the requested file is returned in
                                   BufferSize.
  @param[out]      ImageType       The image type of the downloaded file.

  @retval EFI_SUCCESS              The file was loaded.
  @retval EFI_INVALID_PARAMETER    BufferSize is NULL or Buffer Size is not NULL but Buffer is NULL.
  @retval EFI_OUT_OF_RESOURCES     Could not allocate needed resources
  @retval EFI_BUFFER_TOO_SMALL     The BufferSize is too small to read the current directory entry.
                                   BufferSize has been updated with the size needed to complete
                                   the request.
  @retval Others                   Unexpected error happened.

**/
EFI_STATUS
HttpBootGetBootFile (
  IN     HTTP_BOOT_PRIVATE_DATA   *Private,
  IN     BOOLEAN                  HeaderOnly,
  IN OUT UINTN                    *BufferSize,
     OUT UINT8                    *Buffer,
     OUT HTTP_BOOT_IMAGE_TYPE     *ImageType
  )
{
  EFI_STATUS                 Status;
  EFI_HTTP_STATUS_CODE       StatusCode;
  CHAR8                      *HostName;
  EFI_HTTP_REQUEST_DATA      *RequestData;
  HTTP_IO_RESPONSE_DATA      *ResponseData;
  HTTP_IO_RESPONSE_DATA      ResponseBody;
  HTTP_IO                    *HttpIo;
  HTTP_IO_HEADER             *HttpIoHeader;
  VOID                       *Parser;
  HTTP_BOOT_CALLBACK_DATA    Context;
  UINTN                      ContentLength;
  HTTP_BOOT_CACHE_CONTENT    *Cache;
  UINT8                      *Block;
  UINTN                      UrlSize;
  CHAR16                     *Url;
  BOOLEAN                    IdentityMode;
  UINTN                      ReceivedSize;

  ASSERT (Private != NULL);
  ASSERT (Private->HttpCreated);

  if (BufferSize == NULL || ImageType == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  if (*BufferSize != 0 && Buffer == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  //
  // First, check whether we already cached the requested Uri.
  //
  UrlSize = AsciiStrSize (Private->BootFileUri);
  Url = AllocatePool (UrlSize * sizeof (CHAR16));
  if (Url == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }
  AsciiStrToUnicodeStrS (Private->BootFileUri, Url, UrlSize);
  if (!HeaderOnly && Buffer != NULL) {
    Status = HttpBootGetFileFromCache (Private, Url, BufferSize, Buffer, ImageType);
    if (Status != EFI_NOT_FOUND) {
      FreePool (Url);
      return Status;
    }
  }

  //
  // Not found in cache, try to download it through HTTP.
  //

  //
  // 1. Create a temp cache item for the requested URI if caller doesn't provide buffer.
  //
  Cache = NULL;
  if ((!HeaderOnly) && (*BufferSize == 0)) {
    Cache = AllocateZeroPool (sizeof (HTTP_BOOT_CACHE_CONTENT));
    if (Cache == NULL) {
      Status = EFI_OUT_OF_RESOURCES;
      goto ERROR_1;
    }
    Cache->ImageType = ImageTypeMax;
    InitializeListHead (&Cache->EntityDataList);
  }

  //
  // 2. Send HTTP request message.
  //

  //
  // 2.1 Build HTTP header for the request, 3 header is needed to download a boot file:
  //       Host
  //       Accept
  //       User-Agent
  //
  HttpIoHeader = HttpBootCreateHeader (3);
  if (HttpIoHeader == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto ERROR_2;
  }

  //
  // Add HTTP header field 1: Host
  //
  HostName = NULL;
  Status = HttpUrlGetHostName (
             Private->BootFileUri,
             Private->BootFileUriParser,
             &HostName
             );
  if (EFI_ERROR (Status)) {
    goto ERROR_3;
  }
  Status = HttpBootSetHeader (
             HttpIoHeader,
             HTTP_HEADER_HOST,
             HostName
             );
  FreePool (HostName);
  if (EFI_ERROR (Status)) {
    goto ERROR_3;
  }

  //
  // Add HTTP header field 2: Accept
  //
  Status = HttpBootSetHeader (
             HttpIoHeader,
             HTTP_HEADER_ACCEPT,
             "*/*"
             );
  if (EFI_ERROR (Status)) {
    goto ERROR_3;
  }

  //
  // Add HTTP header field 3: User-Agent
  //
  Status = HttpBootSetHeader (
             HttpIoHeader,
             HTTP_HEADER_USER_AGENT,
             HTTP_USER_AGENT_EFI_HTTP_BOOT
             );
  if (EFI_ERROR (Status)) {
    goto ERROR_3;
  }

  //
  // 2.2 Build the rest of HTTP request info.
  //
  RequestData = AllocatePool (sizeof (EFI_HTTP_REQUEST_DATA));
  if (RequestData == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto ERROR_3;
  }
  RequestData->Method = HeaderOnly ? HttpMethodHead : HttpMethodGet;
  RequestData->Url = Url;

  //
  // 2.3 Record the request info in a temp cache item.
  //
  if (Cache != NULL) {
    Cache->RequestData = RequestData;
  }

  //
  // 2.4 Send out the request to HTTP server.
  //
  HttpIo = &Private->HttpIo;
  Status = HttpIoSendRequest (
             HttpIo,
             RequestData,
             HttpIoHeader->HeaderCount,
             HttpIoHeader->Headers,
             0,
             NULL
            );
  if (EFI_ERROR (Status)) {
    goto ERROR_4;
  }

  //
  // 3. Receive HTTP response message.
  //

  //
  // 3.1 First step, use zero BodyLength to only receive the response headers.
  //
  ResponseData = AllocateZeroPool (sizeof(HTTP_IO_RESPONSE_DATA));
  if (ResponseData == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto ERROR_4;
  }
  Status = HttpIoRecvResponse (
             &Private->HttpIo,
             TRUE,
             ResponseData
             );
  if (EFI_ERROR (Status) || EFI_ERROR (ResponseData->Status)) {
    if (EFI_ERROR (ResponseData->Status)) {
      StatusCode = HttpIo->RspToken.Message->Data.Response->StatusCode;
      HttpBootPrintErrorMessage (StatusCode);
      Status = ResponseData->Status;
    }
    goto ERROR_5;
  }

  //
  // Check the image type according to server's response.
  //
  Status = HttpBootCheckImageType (
             Private->BootFileUri,
             Private->BootFileUriParser,
             ResponseData->HeaderCount,
             ResponseData->Headers,
             ImageType
             );
  if (EFI_ERROR (Status)) {
    goto ERROR_5;
  }

  //
  // 3.2 Cache the response header.
  //
  if (Cache != NULL) {
    Cache->ResponseData = ResponseData;
    Cache->ImageType = *ImageType;
  }

  //
  // 3.3 Init a message-body parser from the header information.
  //
  Parser = NULL;
  Context.NewBlock   = FALSE;
  Context.Block      = NULL;
  Context.CopyedSize = 0;
  Context.Buffer     = Buffer;
  Context.BufferSize = *BufferSize;
  Context.Cache      = Cache;
  Context.Private    = Private;
  Status = HttpInitMsgParser (
             HeaderOnly ? HttpMethodHead : HttpMethodGet,
             ResponseData->Response.StatusCode,
             ResponseData->HeaderCount,
             ResponseData->Headers,
             HttpBootGetBootFileCallback,
             (VOID*) &Context,
             &Parser
             );
  if (EFI_ERROR (Status)) {
    goto ERROR_6;
  }

  //
  // 3.4 Continue to receive and parse message-body if needed.
  //
  Block = NULL;
  if (!HeaderOnly) {
    //
    // 3.4.1, check whether we are in identity transfer-coding.
    //
    ContentLength = 0;
    Status = HttpGetEntityLength (Parser, &ContentLength);
    if (!EFI_ERROR (Status)) {
      IdentityMode = TRUE;
    } else {
      IdentityMode = FALSE;
    }

    //
    // 3.4.2, start the message-body download, the identity and chunked transfer-coding
    // is handled in different path here.
    //
    ZeroMem (&ResponseBody, sizeof (HTTP_IO_RESPONSE_DATA));
    if (IdentityMode) {
      //
      // In identity transfer-coding there is no need to parse the message body,
      // just download the message body to the user provided buffer directly.
      //
      ReceivedSize = 0;
      while (ReceivedSize < ContentLength) {
        ResponseBody.Body       = (CHAR8*) Buffer + ReceivedSize;
        ResponseBody.BodyLength = *BufferSize - ReceivedSize;
        Status = HttpIoRecvResponse (
                   &Private->HttpIo,
                   FALSE,
                   &ResponseBody
                   );
        if (EFI_ERROR (Status) || EFI_ERROR (ResponseBody.Status)) {
          if (EFI_ERROR (ResponseBody.Status)) {
            Status = ResponseBody.Status;
          }
          goto ERROR_6;
        }
        ReceivedSize += ResponseBody.BodyLength;
        if (Private->HttpBootCallback != NULL) {
          Status = Private->HttpBootCallback->Callback (
                     Private->HttpBootCallback,
                     HttpBootHttpEntityBody,
                     TRUE,
                     (UINT32)ResponseBody.BodyLength,
                     ResponseBody.Body
                     );
          if (EFI_ERROR (Status)) {
            goto ERROR_6;
          }
        }
      }
    } else {
      //
      // In "chunked" transfer-coding mode, so we need to parse the received
      // data to get the real entity content.
      //
      Block = NULL;
      while (!HttpIsMessageComplete (Parser)) {
        //
        // Allocate a buffer in Block to hold the message-body.
        // If caller provides a buffer, this Block will be reused in every HttpIoRecvResponse().
        // Otherwise a buffer, the buffer in Block will be cached and we should allocate a new before
        // every HttpIoRecvResponse().
        //
        if (Block == NULL || Context.BufferSize == 0) {
          Block = AllocatePool (HTTP_BOOT_BLOCK_SIZE);
          if (Block == NULL) {
            Status = EFI_OUT_OF_RESOURCES;
            goto ERROR_6;
          }
          Context.NewBlock = TRUE;
          Context.Block = Block;
        } else {
          Context.NewBlock = FALSE;
        }

        ResponseBody.Body       = (CHAR8*) Block;
        ResponseBody.BodyLength = HTTP_BOOT_BLOCK_SIZE;
        Status = HttpIoRecvResponse (
                   &Private->HttpIo,
                   FALSE,
                   &ResponseBody
                   );
        if (EFI_ERROR (Status) || EFI_ERROR (ResponseBody.Status)) {
          if (EFI_ERROR (ResponseBody.Status)) {
            Status = ResponseBody.Status;
          }
          goto ERROR_6;
        }

        //
        // Parse the new received block of the message-body, the block will be saved in cache.
        //
        Status = HttpParseMessageBody (
                   Parser,
                   ResponseBody.BodyLength,
                   ResponseBody.Body
                   );
        if (EFI_ERROR (Status)) {
          goto ERROR_6;
        }
      }
    }
  }

  //
  // 3.5 Message-body receive & parse is completed, we should be able to get the file size now.
  //
  Status = HttpGetEntityLength (Parser, &ContentLength);
  if (EFI_ERROR (Status)) {
    goto ERROR_6;
  }

  if (*BufferSize < ContentLength) {
    Status = EFI_BUFFER_TOO_SMALL;
  } else {
    Status = EFI_SUCCESS;
  }
  *BufferSize = ContentLength;

  //
  // 4. Save the cache item to driver's cache list and return.
  //
  if (Cache != NULL) {
    Cache->EntityLength = ContentLength;
    InsertTailList (&Private->CacheList, &Cache->Link);
  }

  if (Parser != NULL) {
    HttpFreeMsgParser (Parser);
  }

  return Status;

ERROR_6:
  if (Parser != NULL) {
    HttpFreeMsgParser (Parser);
  }
  if (Context.Block != NULL) {
    FreePool (Context.Block);
  }
  HttpBootFreeCache (Cache);

ERROR_5:
  if (ResponseData != NULL) {
    FreePool (ResponseData);
  }
ERROR_4:
  if (RequestData != NULL) {
    FreePool (RequestData);
  }
ERROR_3:
  HttpBootFreeHeader (HttpIoHeader);
ERROR_2:
  if (Cache != NULL) {
    FreePool (Cache);
  }
ERROR_1:
  if (Url != NULL) {
    FreePool (Url);
  }

  return Status;
}