summaryrefslogtreecommitdiff
path: root/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
blob: 1bf7e1f198dc79079f128fb306a4b9695c8edcc1 (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
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
/** @file

Copyright (c) 2005 - 2007, Intel Corporation
All rights reserved. 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.

Module Name:

  NetLib.c

Abstract:



**/

#include <PiDxe.h>

#include <Protocol/ServiceBinding.h>
#include <Protocol/SimpleNetwork.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/NicIp4Config.h>
#include <Protocol/ComponentName.h>
#include <Protocol/ComponentName2.h>
#include <Protocol/Ip4.h>
#include <Protocol/Dpc.h>

#include <Library/NetLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DevicePathLib.h>

EFI_DPC_PROTOCOL *mDpc = NULL;

GLOBAL_REMOVE_IF_UNREFERENCED CONST CHAR8 mNetLibHexStr[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

//
// All the supported IP4 maskes in host byte order.
//
IP4_ADDR  gIp4AllMasks[IP4_MASK_NUM] = {
  0x00000000,
  0x80000000,
  0xC0000000,
  0xE0000000,
  0xF0000000,
  0xF8000000,
  0xFC000000,
  0xFE000000,

  0xFF000000,
  0xFF800000,
  0xFFC00000,
  0xFFE00000,
  0xFFF00000,
  0xFFF80000,
  0xFFFC0000,
  0xFFFE0000,

  0xFFFF0000,
  0xFFFF8000,
  0xFFFFC000,
  0xFFFFE000,
  0xFFFFF000,
  0xFFFFF800,
  0xFFFFFC00,
  0xFFFFFE00,

  0xFFFFFF00,
  0xFFFFFF80,
  0xFFFFFFC0,
  0xFFFFFFE0,
  0xFFFFFFF0,
  0xFFFFFFF8,
  0xFFFFFFFC,
  0xFFFFFFFE,
  0xFFFFFFFF,
};

EFI_IPv4_ADDRESS  mZeroIp4Addr = {{0, 0, 0, 0}};

/**
  Return the length of the mask. If the mask is invalid,
  return the invalid length 33, which is IP4_MASK_NUM.
  NetMask is in the host byte order.

  @param  NetMask               The netmask to get the length from

  @return The length of the netmask, IP4_MASK_NUM if the mask isn't
  @return supported.

**/
INTN
EFIAPI
NetGetMaskLength (
  IN IP4_ADDR               NetMask
  )
{
  INTN                      Index;

  for (Index = 0; Index < IP4_MASK_NUM; Index++) {
    if (NetMask == gIp4AllMasks[Index]) {
      break;
    }
  }

  return Index;
}



/**
  Return the class of the address, such as class a, b, c.
  Addr is in host byte order.

  @param  Addr                  The address to get the class from

  @return IP address class, such as IP4_ADDR_CLASSA

**/
INTN
EFIAPI
NetGetIpClass (
  IN IP4_ADDR               Addr
  )
{
  UINT8                     ByteOne;

  ByteOne = (UINT8) (Addr >> 24);

  if ((ByteOne & 0x80) == 0) {
    return IP4_ADDR_CLASSA;

  } else if ((ByteOne & 0xC0) == 0x80) {
    return IP4_ADDR_CLASSB;

  } else if ((ByteOne & 0xE0) == 0xC0) {
    return IP4_ADDR_CLASSC;

  } else if ((ByteOne & 0xF0) == 0xE0) {
    return IP4_ADDR_CLASSD;

  } else {
    return IP4_ADDR_CLASSE;

  }
}


/**
  Check whether the IP is a valid unicast address according to
  the netmask. If NetMask is zero, use the IP address's class to
  get the default mask.

  @param  Ip                    The IP to check againist
  @param  NetMask               The mask of the IP

  @return TRUE if IP is a valid unicast address on the network, otherwise FALSE

**/
BOOLEAN
EFIAPI
Ip4IsUnicast (
  IN IP4_ADDR               Ip,
  IN IP4_ADDR               NetMask
  )
{
  INTN                      Class;

  Class = NetGetIpClass (Ip);

  if ((Ip == 0) || (Class >= IP4_ADDR_CLASSD)) {
    return FALSE;
  }

  if (NetMask == 0) {
    NetMask = gIp4AllMasks[Class << 3];
  }

  if (((Ip &~NetMask) == ~NetMask) || ((Ip &~NetMask) == 0)) {
    return FALSE;
  }

  return TRUE;
}


/**
  Initialize a random seed using current time.

  None

  @return The random seed initialized with current time.

**/
UINT32
EFIAPI
NetRandomInitSeed (
  VOID
  )
{
  EFI_TIME                  Time;
  UINT32                    Seed;

  gRT->GetTime (&Time, NULL);
  Seed = (~Time.Hour << 24 | Time.Day << 16 | Time.Minute << 8 | Time.Second);
  Seed ^= Time.Nanosecond;
  Seed ^= Time.Year << 7;

  return Seed;
}


/**
  Extract a UINT32 from a byte stream, then convert it to host
  byte order. Use this function to avoid alignment error.

  @param  Buf                   The buffer to extract the UINT32.

  @return The UINT32 extracted.

**/
UINT32
EFIAPI
NetGetUint32 (
  IN UINT8                  *Buf
  )
{
  UINT32                    Value;

  CopyMem (&Value, Buf, sizeof (UINT32));
  return NTOHL (Value);
}


/**
  Put a UINT32 to the byte stream. Convert it from host byte order
  to network byte order before putting.

  @param  Buf                   The buffer to put the UINT32
  @param  Data                  The data to put

  @return None

**/
VOID
EFIAPI
NetPutUint32 (
  IN UINT8                  *Buf,
  IN UINT32                 Data
  )
{
  Data = HTONL (Data);
  CopyMem (Buf, &Data, sizeof (UINT32));
}


/**
  Remove the first entry on the list

  @param  Head                  The list header

  @return The entry that is removed from the list, NULL if the list is empty.

**/
LIST_ENTRY *
EFIAPI
NetListRemoveHead (
  LIST_ENTRY            *Head
  )
{
  LIST_ENTRY            *First;

  ASSERT (Head != NULL);

  if (IsListEmpty (Head)) {
    return NULL;
  }

  First                         = Head->ForwardLink;
  Head->ForwardLink             = First->ForwardLink;
  First->ForwardLink->BackLink  = Head;

  DEBUG_CODE (
    First->ForwardLink  = (LIST_ENTRY *) NULL;
    First->BackLink     = (LIST_ENTRY *) NULL;
  );

  return First;
}


/**
  Remove the last entry on the list

  @param  Head                  The list head

  @return The entry that is removed from the list, NULL if the list is empty.

**/
LIST_ENTRY *
EFIAPI
NetListRemoveTail (
  LIST_ENTRY            *Head
  )
{
  LIST_ENTRY            *Last;

  ASSERT (Head != NULL);

  if (IsListEmpty (Head)) {
    return NULL;
  }

  Last                        = Head->BackLink;
  Head->BackLink              = Last->BackLink;
  Last->BackLink->ForwardLink = Head;

  DEBUG_CODE (
    Last->ForwardLink = (LIST_ENTRY *) NULL;
    Last->BackLink    = (LIST_ENTRY *) NULL;
  );

  return Last;
}


/**
  Insert the NewEntry after the PrevEntry

  @param  PrevEntry             The previous entry to insert after
  @param  NewEntry              The new entry to insert

  @return None

**/
VOID
EFIAPI
NetListInsertAfter (
  IN LIST_ENTRY         *PrevEntry,
  IN LIST_ENTRY         *NewEntry
  )
{
  NewEntry->BackLink                = PrevEntry;
  NewEntry->ForwardLink             = PrevEntry->ForwardLink;
  PrevEntry->ForwardLink->BackLink  = NewEntry;
  PrevEntry->ForwardLink            = NewEntry;
}


/**
  Insert the NewEntry before the PostEntry

  @param  PostEntry             The entry to insert before
  @param  NewEntry              The new entry to insert

  @return None

**/
VOID
EFIAPI
NetListInsertBefore (
  IN LIST_ENTRY     *PostEntry,
  IN LIST_ENTRY     *NewEntry
  )
{
  NewEntry->ForwardLink             = PostEntry;
  NewEntry->BackLink                = PostEntry->BackLink;
  PostEntry->BackLink->ForwardLink  = NewEntry;
  PostEntry->BackLink               = NewEntry;
}


/**
  Initialize the netmap. Netmap is a reposity to keep the <Key, Value> pairs.

  @param  Map                   The netmap to initialize

  @return None

**/
VOID
EFIAPI
NetMapInit (
  IN NET_MAP                *Map
  )
{
  ASSERT (Map != NULL);

  InitializeListHead (&Map->Used);
  InitializeListHead (&Map->Recycled);
  Map->Count = 0;
}


/**
  To clean up the netmap, that is, release allocated memories.

  @param  Map                   The netmap to clean up.

  @return None

**/
VOID
EFIAPI
NetMapClean (
  IN NET_MAP                *Map
  )
{
  NET_MAP_ITEM              *Item;
  LIST_ENTRY                *Entry;
  LIST_ENTRY                *Next;

  ASSERT (Map != NULL);

  NET_LIST_FOR_EACH_SAFE (Entry, Next, &Map->Used) {
    Item = NET_LIST_USER_STRUCT (Entry, NET_MAP_ITEM, Link);

    RemoveEntryList (&Item->Link);
    Map->Count--;

    gBS->FreePool (Item);
  }

  ASSERT ((Map->Count == 0) && IsListEmpty (&Map->Used));

  NET_LIST_FOR_EACH_SAFE (Entry, Next, &Map->Recycled) {
    Item = NET_LIST_USER_STRUCT (Entry, NET_MAP_ITEM, Link);

    RemoveEntryList (&Item->Link);
    gBS->FreePool (Item);
  }

  ASSERT (IsListEmpty (&Map->Recycled));
}


/**
  Test whether the netmap is empty

  @param  Map                   The net map to test

  @return TRUE if the netmap is empty, otherwise FALSE.

**/
BOOLEAN
EFIAPI
NetMapIsEmpty (
  IN NET_MAP                *Map
  )
{
  ASSERT (Map != NULL);
  return (BOOLEAN) (Map->Count == 0);
}


/**
  Return the number of the <Key, Value> pairs in the netmap.

  @param  Map                   The netmap to get the entry number

  @return The entry number in the netmap.

**/
UINTN
EFIAPI
NetMapGetCount (
  IN NET_MAP                *Map
  )
{
  return Map->Count;
}


/**
  Allocate an item for the netmap. It will try to allocate
  a batch of items and return one.

  @param  Map                   The netmap to allocate item for

  @return The allocated item or NULL

**/
NET_MAP_ITEM *
NetMapAllocItem (
  IN NET_MAP                *Map
  )
{
  NET_MAP_ITEM              *Item;
  LIST_ENTRY                *Head;
  UINTN                     Index;

  ASSERT (Map != NULL);

  Head = &Map->Recycled;

  if (IsListEmpty (Head)) {
    for (Index = 0; Index < NET_MAP_INCREAMENT; Index++) {
      Item = AllocatePool (sizeof (NET_MAP_ITEM));

      if (Item == NULL) {
        if (Index == 0) {
          return NULL;
        }

        break;
      }

      InsertHeadList (Head, &Item->Link);
    }
  }

  Item = NET_LIST_HEAD (Head, NET_MAP_ITEM, Link);
  NetListRemoveHead (Head);

  return Item;
}


/**
  Allocate an item to save the <Key, Value> pair to the head of the netmap.

  @param  Map                   The netmap to insert into
  @param  Key                   The user's key
  @param  Value                 The user's value for the key

  @retval EFI_OUT_OF_RESOURCES  Failed to allocate the memory for the item
  @retval EFI_SUCCESS           The item is inserted to the head

**/
EFI_STATUS
EFIAPI
NetMapInsertHead (
  IN NET_MAP                *Map,
  IN VOID                   *Key,
  IN VOID                   *Value    OPTIONAL
  )
{
  NET_MAP_ITEM              *Item;

  ASSERT (Map != NULL);

  Item = NetMapAllocItem (Map);

  if (Item == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Item->Key   = Key;
  Item->Value = Value;
  InsertHeadList (&Map->Used, &Item->Link);

  Map->Count++;
  return EFI_SUCCESS;
}


/**
  Allocate an item to save the <Key, Value> pair to the tail of the netmap.

  @param  Map                   The netmap to insert into
  @param  Key                   The user's key
  @param  Value                 The user's value for the key

  @retval EFI_OUT_OF_RESOURCES  Failed to allocate the memory for the item
  @retval EFI_SUCCESS           The item is inserted to the tail

**/
EFI_STATUS
EFIAPI
NetMapInsertTail (
  IN NET_MAP                *Map,
  IN VOID                   *Key,
  IN VOID                   *Value    OPTIONAL
  )
{
  NET_MAP_ITEM              *Item;

  ASSERT (Map != NULL);

  Item = NetMapAllocItem (Map);

  if (Item == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Item->Key   = Key;
  Item->Value = Value;
  InsertTailList (&Map->Used, &Item->Link);

  Map->Count++;

  return EFI_SUCCESS;
}


/**
  Check whther the item is in the Map

  @param  Map                   The netmap to search within
  @param  Item                  The item to search

  @return TRUE if the item is in the netmap, otherwise FALSE.

**/
BOOLEAN
NetItemInMap (
  IN NET_MAP                *Map,
  IN NET_MAP_ITEM           *Item
  )
{
  LIST_ENTRY            *ListEntry;

  NET_LIST_FOR_EACH (ListEntry, &Map->Used) {
    if (ListEntry == &Item->Link) {
      return TRUE;
    }
  }

  return FALSE;
}


/**
  Find the key in the netmap

  @param  Map                   The netmap to search within
  @param  Key                   The key to search

  @return The point to the item contains the Key, or NULL if Key isn't in the map.

**/
NET_MAP_ITEM *
EFIAPI
NetMapFindKey (
  IN  NET_MAP               *Map,
  IN  VOID                  *Key
  )
{
  LIST_ENTRY              *Entry;
  NET_MAP_ITEM            *Item;

  ASSERT (Map != NULL);

  NET_LIST_FOR_EACH (Entry, &Map->Used) {
    Item = NET_LIST_USER_STRUCT (Entry, NET_MAP_ITEM, Link);

    if (Item->Key == Key) {
      return Item;
    }
  }

  return NULL;
}


/**
  Remove the item from the netmap

  @param  Map                   The netmap to remove the item from
  @param  Item                  The item to remove
  @param  Value                 The variable to receive the value if not NULL

  @return The key of the removed item.

**/
VOID *
EFIAPI
NetMapRemoveItem (
  IN  NET_MAP             *Map,
  IN  NET_MAP_ITEM        *Item,
  OUT VOID                **Value           OPTIONAL
  )
{
  ASSERT ((Map != NULL) && (Item != NULL));
  ASSERT (NetItemInMap (Map, Item));

  RemoveEntryList (&Item->Link);
  Map->Count--;
  InsertHeadList (&Map->Recycled, &Item->Link);

  if (Value != NULL) {
    *Value = Item->Value;
  }

  return Item->Key;
}


/**
  Remove the first entry on the netmap

  @param  Map                   The netmap to remove the head from
  @param  Value                 The variable to receive the value if not NULL

  @return The key of the item removed

**/
VOID *
EFIAPI
NetMapRemoveHead (
  IN  NET_MAP               *Map,
  OUT VOID                  **Value         OPTIONAL
  )
{
  NET_MAP_ITEM  *Item;

  //
  // Often, it indicates a programming error to remove
  // the first entry in an empty list
  //
  ASSERT (Map && !IsListEmpty (&Map->Used));

  Item = NET_LIST_HEAD (&Map->Used, NET_MAP_ITEM, Link);
  RemoveEntryList (&Item->Link);
  Map->Count--;
  InsertHeadList (&Map->Recycled, &Item->Link);

  if (Value != NULL) {
    *Value = Item->Value;
  }

  return Item->Key;
}


/**
  Remove the last entry on the netmap

  @param  Map                   The netmap to remove the tail from
  @param  Value                 The variable to receive the value if not NULL

  @return The key of the item removed

**/
VOID *
EFIAPI
NetMapRemoveTail (
  IN  NET_MAP               *Map,
  OUT VOID                  **Value       OPTIONAL
  )
{
  NET_MAP_ITEM              *Item;

  //
  // Often, it indicates a programming error to remove
  // the last entry in an empty list
  //
  ASSERT (Map && !IsListEmpty (&Map->Used));

  Item = NET_LIST_TAIL (&Map->Used, NET_MAP_ITEM, Link);
  RemoveEntryList (&Item->Link);
  Map->Count--;
  InsertHeadList (&Map->Recycled, &Item->Link);

  if (Value != NULL) {
    *Value = Item->Value;
  }

  return Item->Key;
}


/**
  Iterate through the netmap and call CallBack for each item. It will
  contiue the traverse if CallBack returns EFI_SUCCESS, otherwise, break
  from the loop. It returns the CallBack's last return value. This
  function is delete safe for the current item.

  @param  Map                   The Map to iterate through
  @param  CallBack              The callback function to call for each item.
  @param  Arg                   The opaque parameter to the callback

  @return It returns the CallBack's last return value.

**/
EFI_STATUS
EFIAPI
NetMapIterate (
  IN NET_MAP                *Map,
  IN NET_MAP_CALLBACK       CallBack,
  IN VOID                   *Arg
  )
{

  LIST_ENTRY            *Entry;
  LIST_ENTRY            *Next;
  LIST_ENTRY            *Head;
  NET_MAP_ITEM              *Item;
  EFI_STATUS                Result;

  ASSERT ((Map != NULL) && (CallBack != NULL));

  Head = &Map->Used;

  if (IsListEmpty (Head)) {
    return EFI_SUCCESS;
  }

  NET_LIST_FOR_EACH_SAFE (Entry, Next, Head) {
    Item   = NET_LIST_USER_STRUCT (Entry, NET_MAP_ITEM, Link);
    Result = CallBack (Map, Item, Arg);

    if (EFI_ERROR (Result)) {
      return Result;
    }
  }

  return EFI_SUCCESS;
}


/**
  This is the default unload handle for all the network drivers.

  @param  ImageHandle           The drivers' driver image.

  @retval EFI_SUCCESS           The image is unloaded.
  @retval Others                Failed to unload the image.

**/
EFI_STATUS
EFIAPI
NetLibDefaultUnload (
  IN EFI_HANDLE             ImageHandle
  )
{
  EFI_STATUS                        Status;
  EFI_HANDLE                        *DeviceHandleBuffer;
  UINTN                             DeviceHandleCount;
  UINTN                             Index;
  EFI_DRIVER_BINDING_PROTOCOL       *DriverBinding;
  EFI_COMPONENT_NAME_PROTOCOL       *ComponentName;
  EFI_COMPONENT_NAME2_PROTOCOL      *ComponentName2;

  //
  // Get the list of all the handles in the handle database.
  // If there is an error getting the list, then the unload
  // operation fails.
  //
  Status = gBS->LocateHandleBuffer (
                  AllHandles,
                  NULL,
                  NULL,
                  &DeviceHandleCount,
                  &DeviceHandleBuffer
                  );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Disconnect the driver specified by ImageHandle from all
  // the devices in the handle database.
  //
  for (Index = 0; Index < DeviceHandleCount; Index++) {
    Status = gBS->DisconnectController (
                    DeviceHandleBuffer[Index],
                    ImageHandle,
                    NULL
                    );
  }

  //
  // Uninstall all the protocols installed in the driver entry point
  //
  for (Index = 0; Index < DeviceHandleCount; Index++) {
    Status = gBS->HandleProtocol (
                    DeviceHandleBuffer[Index],
                    &gEfiDriverBindingProtocolGuid,
                    (VOID **) &DriverBinding
                    );

    if (EFI_ERROR (Status)) {
      continue;
    }

    if (DriverBinding->ImageHandle != ImageHandle) {
      continue;
    }

    gBS->UninstallProtocolInterface (
          ImageHandle,
          &gEfiDriverBindingProtocolGuid,
          DriverBinding
          );
    Status = gBS->HandleProtocol (
                    DeviceHandleBuffer[Index],
                    &gEfiComponentNameProtocolGuid,
                    (VOID **) &ComponentName
                    );
    if (!EFI_ERROR (Status)) {
      gBS->UninstallProtocolInterface (
             ImageHandle,
             &gEfiComponentNameProtocolGuid,
             ComponentName
             );
    }

    Status = gBS->HandleProtocol (
                    DeviceHandleBuffer[Index],
                    &gEfiComponentName2ProtocolGuid,
                    (VOID **) &ComponentName2
                    );
    if (!EFI_ERROR (Status)) {
      gBS->UninstallProtocolInterface (
             ImageHandle,
             &gEfiComponentName2ProtocolGuid,
             ComponentName2
             );
    }
  }

  //
  // Free the buffer containing the list of handles from the handle database
  //
  if (DeviceHandleBuffer != NULL) {
    gBS->FreePool (DeviceHandleBuffer);
  }

  return EFI_SUCCESS;
}



/**
  Create a child of the service that is identified by ServiceBindingGuid.

  @param  Controller            The controller which has the service installed.
  @param  Image                 The image handle used to open service.
  @param  ServiceBindingGuid    The service's Guid.
  @param  ChildHandle           The handle to receive the create child

  @retval EFI_SUCCESS           The child is successfully created.
  @retval Others                Failed to create the child.

**/
EFI_STATUS
EFIAPI
NetLibCreateServiceChild (
  IN  EFI_HANDLE            Controller,
  IN  EFI_HANDLE            Image,
  IN  EFI_GUID              *ServiceBindingGuid,
  OUT EFI_HANDLE            *ChildHandle
  )
{
  EFI_STATUS                    Status;
  EFI_SERVICE_BINDING_PROTOCOL  *Service;


  ASSERT ((ServiceBindingGuid != NULL) && (ChildHandle != NULL));

  //
  // Get the ServiceBinding Protocol
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  ServiceBindingGuid,
                  (VOID **) &Service,
                  Image,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Create a child
  //
  Status = Service->CreateChild (Service, ChildHandle);
  return Status;
}


/**
  Destory a child of the service that is identified by ServiceBindingGuid.

  @param  Controller            The controller which has the service installed.
  @param  Image                 The image handle used to open service.
  @param  ServiceBindingGuid    The service's Guid.
  @param  ChildHandle           The child to destory

  @retval EFI_SUCCESS           The child is successfully destoried.
  @retval Others                Failed to destory the child.

**/
EFI_STATUS
EFIAPI
NetLibDestroyServiceChild (
  IN  EFI_HANDLE            Controller,
  IN  EFI_HANDLE            Image,
  IN  EFI_GUID              *ServiceBindingGuid,
  IN  EFI_HANDLE            ChildHandle
  )
{
  EFI_STATUS                    Status;
  EFI_SERVICE_BINDING_PROTOCOL  *Service;

  ASSERT (ServiceBindingGuid != NULL);

  //
  // Get the ServiceBinding Protocol
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  ServiceBindingGuid,
                  (VOID **) &Service,
                  Image,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // destory the child
  //
  Status = Service->DestroyChild (Service, ChildHandle);
  return Status;
}


/**
  Convert the mac address of the simple network protocol installed on
  SnpHandle to a unicode string. Callers are responsible for freeing the
  string storage.

  @param  SnpHandle             The handle where the simple network protocol is
                                installed on.
  @param  ImageHandle           The image handle used to act as the agent handle to
                                get the simple network protocol.
  @param  MacString             The pointer to store the address of the string
                                representation of  the mac address.

  @retval EFI_OUT_OF_RESOURCES  There are not enough memory resource.
  @retval other                 Failed to open the simple network protocol.

**/
EFI_STATUS
EFIAPI
NetLibGetMacString (
  IN           EFI_HANDLE  SnpHandle,
  IN           EFI_HANDLE  ImageHandle,
  IN OUT       CHAR16      **MacString
  )
{
  EFI_STATUS                   Status;
  EFI_SIMPLE_NETWORK_PROTOCOL  *Snp;
  EFI_SIMPLE_NETWORK_MODE      *Mode;
  CHAR16                       *MacAddress;
  UINTN                        Index;

  *MacString = NULL;

  //
  // Get the Simple Network protocol from the SnpHandle.
  //
  Status = gBS->OpenProtocol (
                  SnpHandle,
                  &gEfiSimpleNetworkProtocolGuid,
                  (VOID **) &Snp,
                  ImageHandle,
                  SnpHandle,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Mode = Snp->Mode;

  //
  // It takes 2 unicode characters to represent a 1 byte binary buffer.
  // Plus one unicode character for the null-terminator.
  //
  MacAddress = AllocatePool ((2 * Mode->HwAddressSize + 1) * sizeof (CHAR16));
  if (MacAddress == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  //
  // Convert the mac address into a unicode string.
  //
  for (Index = 0; Index < Mode->HwAddressSize; Index++) {
    MacAddress[Index * 2]     = (CHAR16) mNetLibHexStr[(Mode->CurrentAddress.Addr[Index] >> 4) & 0x0F];
    MacAddress[Index * 2 + 1] = (CHAR16) mNetLibHexStr[Mode->CurrentAddress.Addr[Index] & 0x0F];
  }

  MacAddress[Mode->HwAddressSize * 2] = L'\0';

  *MacString = MacAddress;

  return EFI_SUCCESS;
}

/**
  Check the default address used by the IPv4 driver is static or dynamic (acquired
  from DHCP).

  @param  Controller     The controller handle which has the NIC Ip4 Config Protocol
                         relative with the default address to judge.

  @retval TRUE           If the default address is static.
  @retval FALSE          If the default address is acquired from DHCP.

**/
BOOLEAN
NetLibDefaultAddressIsStatic (
  IN EFI_HANDLE  Controller
  )
{
  EFI_STATUS                   Status;
  EFI_NIC_IP4_CONFIG_PROTOCOL  *NicIp4;
  UINTN                        Len;
  NIC_IP4_CONFIG_INFO          *ConfigInfo;
  BOOLEAN                      IsStatic;

  Status = gBS->HandleProtocol (
                  Controller,
                  &gEfiNicIp4ConfigProtocolGuid,
                  (VOID **) &NicIp4
                  );
  if (EFI_ERROR (Status)) {
    return TRUE;
  }

  Len = 0;
  Status = NicIp4->GetInfo (NicIp4, &Len, NULL);
  if (Status != EFI_BUFFER_TOO_SMALL) {
    return TRUE;
  }

  ConfigInfo = AllocatePool (Len);
  if (ConfigInfo == NULL) {
    return TRUE;
  }

  IsStatic = TRUE;
  Status = NicIp4->GetInfo (NicIp4, &Len, ConfigInfo);
  if (EFI_ERROR (Status)) {
    goto ON_EXIT;
  }

  IsStatic = (BOOLEAN) (ConfigInfo->Source == IP4_CONFIG_SOURCE_STATIC);

ON_EXIT:

  gBS->FreePool (ConfigInfo);

  return IsStatic;
}

/**
  Create an IPv4 device path node.

  @param  Node                  Pointer to the IPv4 device path node.
  @param  Controller            The handle where the NIC IP4 config protocol resides.
  @param  LocalIp               The local IPv4 address.
  @param  LocalPort             The local port.
  @param  RemoteIp              The remote IPv4 address.
  @param  RemotePort            The remote port.
  @param  Protocol              The protocol type in the IP header.
  @param  UseDefaultAddress     Whether this instance is using default address or not.

  @retval None
**/
VOID
EFIAPI
NetLibCreateIPv4DPathNode (
  IN OUT IPv4_DEVICE_PATH  *Node,
  IN EFI_HANDLE            Controller,
  IN IP4_ADDR              LocalIp,
  IN UINT16                LocalPort,
  IN IP4_ADDR              RemoteIp,
  IN UINT16                RemotePort,
  IN UINT16                Protocol,
  IN BOOLEAN               UseDefaultAddress
  )
{
  Node->Header.Type    = MESSAGING_DEVICE_PATH;
  Node->Header.SubType = MSG_IPv4_DP;
  SetDevicePathNodeLength (&Node->Header, 19);

  CopyMem (&Node->LocalIpAddress, &LocalIp, sizeof (EFI_IPv4_ADDRESS));
  CopyMem (&Node->RemoteIpAddress, &RemoteIp, sizeof (EFI_IPv4_ADDRESS));

  Node->LocalPort  = LocalPort;
  Node->RemotePort = RemotePort;

  Node->Protocol = Protocol;

  if (!UseDefaultAddress) {
    Node->StaticIpAddress = TRUE;
  } else {
    Node->StaticIpAddress = NetLibDefaultAddressIsStatic (Controller);
  }
}


/**
  Find the UNDI/SNP handle from controller and protocol GUID.
  For example, IP will open a MNP child to transmit/receive
  packets, when MNP is stopped, IP should also be stopped. IP
  needs to find its own private data which is related the IP's
  service binding instance that is install on UNDI/SNP handle.
  Now, the controller is either a MNP or ARP child handle. But
  IP opens these handle BY_DRIVER, use that info, we can get the
  UNDI/SNP handle.

  @param  Controller            Then protocol handle to check
  @param  ProtocolGuid          The protocol that is related with the handle.

  @return The UNDI/SNP handle or NULL.

**/
EFI_HANDLE
EFIAPI
NetLibGetNicHandle (
  IN EFI_HANDLE             Controller,
  IN EFI_GUID               *ProtocolGuid
  )
{
  EFI_OPEN_PROTOCOL_INFORMATION_ENTRY *OpenBuffer;
  EFI_HANDLE                          Handle;
  EFI_STATUS                          Status;
  UINTN                               OpenCount;
  UINTN                               Index;

  Status = gBS->OpenProtocolInformation (
                  Controller,
                  ProtocolGuid,
                  &OpenBuffer,
                  &OpenCount
                  );

  if (EFI_ERROR (Status)) {
    return NULL;
  }

  Handle = NULL;

  for (Index = 0; Index < OpenCount; Index++) {
    if (OpenBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_DRIVER) {
      Handle = OpenBuffer[Index].ControllerHandle;
      break;
    }
  }

  gBS->FreePool (OpenBuffer);
  return Handle;
}

/**
  Add a Deferred Procedure Call to the end of the DPC queue.

  @DpcTpl           The EFI_TPL that the DPC should be invoked.
  @DpcProcedure     Pointer to the DPC's function.
  @DpcContext       Pointer to the DPC's context.  Passed to DpcProcedure
                    when DpcProcedure is invoked.

  @retval  EFI_SUCCESS              The DPC was queued.
  @retval  EFI_INVALID_PARAMETER    DpcTpl is not a valid EFI_TPL.
                                    DpcProcedure is NULL.
  @retval  EFI_OUT_OF_RESOURCES     There are not enough resources available to
                                    add the DPC to the queue.

**/
EFI_STATUS
EFIAPI
NetLibQueueDpc (
  IN EFI_TPL            DpcTpl,
  IN EFI_DPC_PROCEDURE  DpcProcedure,
  IN VOID               *DpcContext    OPTIONAL
  )
{
  return mDpc->QueueDpc (mDpc, DpcTpl, DpcProcedure, DpcContext);
}

/**
  Add a Deferred Procedure Call to the end of the DPC queue.

  @retval  EFI_SUCCESS              One or more DPCs were invoked.
  @retval  EFI_NOT_FOUND            No DPCs were invoked.

**/
EFI_STATUS
EFIAPI
NetLibDispatchDpc (
  VOID
  )
{
  return mDpc->DispatchDpc(mDpc);
}


/**
  The constructor function caches the pointer to DPC protocol.

  The constructor function locates DPC protocol from protocol database.
  It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.

  @param  ImageHandle   The firmware allocated handle for the EFI image.
  @param  SystemTable   A pointer to the EFI System Table.

  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.

**/
EFI_STATUS
EFIAPI
NetLibConstructor (
  IN EFI_HANDLE                ImageHandle,
  IN EFI_SYSTEM_TABLE          *SystemTable
  )
{
  EFI_STATUS  Status;

  Status = gBS->LocateProtocol (&gEfiDpcProtocolGuid, NULL, (VOID**) &mDpc);
  ASSERT_EFI_ERROR (Status);
  ASSERT (mDpc != NULL);

  return Status;
}