Bootlin logo

Elixir Cross Referencer

   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
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
// SPDX-License-Identifier: GPL-2.0+
/*
 *  Copyright IBM Corp. 2001, 2012
 *  Author(s): Robert Burroughs
 *	       Eric Rossman (edrossma@us.ibm.com)
 *
 *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
 *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
 *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
 *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
 */

#define KMSG_COMPONENT "zcrypt"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>

#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_error.h"
#include "zcrypt_msgtype6.h"
#include "zcrypt_cca_key.h"

#define CEXXC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply	    */

#define CEIL4(x) ((((x)+3)/4)*4)

struct response_type {
	struct completion work;
	int type;
};
#define CEXXC_RESPONSE_TYPE_ICA  0
#define CEXXC_RESPONSE_TYPE_XCRB 1
#define CEXXC_RESPONSE_TYPE_EP11 2

MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("Cryptographic Coprocessor (message type 6), " \
		   "Copyright IBM Corp. 2001, 2012");
MODULE_LICENSE("GPL");

/**
 * CPRB
 *	  Note that all shorts, ints and longs are little-endian.
 *	  All pointer fields are 32-bits long, and mean nothing
 *
 *	  A request CPRB is followed by a request_parameter_block.
 *
 *	  The request (or reply) parameter block is organized thus:
 *	    function code
 *	    VUD block
 *	    key block
 */
struct CPRB {
	unsigned short cprb_len;	/* CPRB length			 */
	unsigned char cprb_ver_id;	/* CPRB version id.		 */
	unsigned char pad_000;		/* Alignment pad byte.		 */
	unsigned char srpi_rtcode[4];	/* SRPI return code LELONG	 */
	unsigned char srpi_verb;	/* SRPI verb type		 */
	unsigned char flags;		/* flags			 */
	unsigned char func_id[2];	/* function id			 */
	unsigned char checkpoint_flag;	/*				 */
	unsigned char resv2;		/* reserved			 */
	unsigned short req_parml;	/* request parameter buffer	 */
					/* length 16-bit little endian	 */
	unsigned char req_parmp[4];	/* request parameter buffer	 *
					 * pointer (means nothing: the	 *
					 * parameter buffer follows	 *
					 * the CPRB).			 */
	unsigned char req_datal[4];	/* request data buffer		 */
					/* length	  ULELONG	 */
	unsigned char req_datap[4];	/* request data buffer		 */
					/* pointer			 */
	unsigned short rpl_parml;	/* reply  parameter buffer	 */
					/* length 16-bit little endian	 */
	unsigned char pad_001[2];	/* Alignment pad bytes. ULESHORT */
	unsigned char rpl_parmp[4];	/* reply parameter buffer	 *
					 * pointer (means nothing: the	 *
					 * parameter buffer follows	 *
					 * the CPRB).			 */
	unsigned char rpl_datal[4];	/* reply data buffer len ULELONG */
	unsigned char rpl_datap[4];	/* reply data buffer		 */
					/* pointer			 */
	unsigned short ccp_rscode;	/* server reason code	ULESHORT */
	unsigned short ccp_rtcode;	/* server return code	ULESHORT */
	unsigned char repd_parml[2];	/* replied parameter len ULESHORT*/
	unsigned char mac_data_len[2];	/* Mac Data Length	ULESHORT */
	unsigned char repd_datal[4];	/* replied data length	ULELONG	 */
	unsigned char req_pc[2];	/* PC identifier		 */
	unsigned char res_origin[8];	/* resource origin		 */
	unsigned char mac_value[8];	/* Mac Value			 */
	unsigned char logon_id[8];	/* Logon Identifier		 */
	unsigned char usage_domain[2];	/* cdx				 */
	unsigned char resv3[18];	/* reserved for requestor	 */
	unsigned short svr_namel;	/* server name length  ULESHORT	 */
	unsigned char svr_name[8];	/* server name			 */
} __packed;

struct function_and_rules_block {
	unsigned char function_code[2];
	unsigned short ulen;
	unsigned char only_rule[8];
} __packed;

/**
 * The following is used to initialize the CPRBX passed to the CEXxC/CEXxP
 * card in a type6 message. The 3 fields that must be filled in at execution
 * time are  req_parml, rpl_parml and usage_domain.
 * Everything about this interface is ascii/big-endian, since the
 * device does *not* have 'Intel inside'.
 *
 * The CPRBX is followed immediately by the parm block.
 * The parm block contains:
 * - function code ('PD' 0x5044 or 'PK' 0x504B)
 * - rule block (one of:)
 *   + 0x000A 'PKCS-1.2' (MCL2 'PD')
 *   + 0x000A 'ZERO-PAD' (MCL2 'PK')
 *   + 0x000A 'ZERO-PAD' (MCL3 'PD' or CEX2C 'PD')
 *   + 0x000A 'MRP     ' (MCL3 'PK' or CEX2C 'PK')
 * - VUD block
 */
static const struct CPRBX static_cprbx = {
	.cprb_len	=  0x00DC,
	.cprb_ver_id	=  0x02,
	.func_id	= {0x54, 0x32},
};

int speed_idx_cca(int req_type)
{
	switch (req_type) {
	case 0x4142:
	case 0x4149:
	case 0x414D:
	case 0x4341:
	case 0x4344:
	case 0x4354:
	case 0x4358:
	case 0x444B:
	case 0x4558:
	case 0x4643:
	case 0x4651:
	case 0x4C47:
	case 0x4C4B:
	case 0x4C51:
	case 0x4F48:
	case 0x504F:
	case 0x5053:
	case 0x5058:
	case 0x5343:
	case 0x5344:
	case 0x5345:
	case 0x5350:
		return LOW;
	case 0x414B:
	case 0x4345:
	case 0x4349:
	case 0x434D:
	case 0x4847:
	case 0x4849:
	case 0x484D:
	case 0x4850:
	case 0x4851:
	case 0x4954:
	case 0x4958:
	case 0x4B43:
	case 0x4B44:
	case 0x4B45:
	case 0x4B47:
	case 0x4B48:
	case 0x4B49:
	case 0x4B4E:
	case 0x4B50:
	case 0x4B52:
	case 0x4B54:
	case 0x4B58:
	case 0x4D50:
	case 0x4D53:
	case 0x4D56:
	case 0x4D58:
	case 0x5044:
	case 0x5045:
	case 0x5046:
	case 0x5047:
	case 0x5049:
	case 0x504B:
	case 0x504D:
	case 0x5254:
	case 0x5347:
	case 0x5349:
	case 0x534B:
	case 0x534D:
	case 0x5356:
	case 0x5358:
	case 0x5443:
	case 0x544B:
	case 0x5647:
		return HIGH;
	default:
		return MEDIUM;
	}
}

int speed_idx_ep11(int req_type)
{
	switch (req_type) {
	case  1:
	case  2:
	case 36:
	case 37:
	case 38:
	case 39:
	case 40:
		return LOW;
	case 17:
	case 18:
	case 19:
	case 20:
	case 21:
	case 22:
	case 26:
	case 30:
	case 31:
	case 32:
	case 33:
	case 34:
	case 35:
		return HIGH;
	default:
		return MEDIUM;
	}
}


/**
 * Convert a ICAMEX message to a type6 MEX message.
 *
 * @zq: crypto device pointer
 * @ap_msg: pointer to AP message
 * @mex: pointer to user input data
 *
 * Returns 0 on success or negative errno value.
 */
static int ICAMEX_msg_to_type6MEX_msgX(struct zcrypt_queue *zq,
				       struct ap_message *ap_msg,
				       struct ica_rsa_modexpo *mex)
{
	static struct type6_hdr static_type6_hdrX = {
		.type		=  0x06,
		.offset1	=  0x00000058,
		.agent_id	= {'C', 'A',},
		.function_code	= {'P', 'K'},
	};
	static struct function_and_rules_block static_pke_fnr = {
		.function_code	= {'P', 'K'},
		.ulen		= 10,
		.only_rule	= {'M', 'R', 'P', ' ', ' ', ' ', ' ', ' '}
	};
	struct {
		struct type6_hdr hdr;
		struct CPRBX cprbx;
		struct function_and_rules_block fr;
		unsigned short length;
		char text[0];
	} __packed * msg = ap_msg->message;
	int size;

	/*
	 * The inputdatalength was a selection criteria in the dispatching
	 * function zcrypt_rsa_modexpo(). However, make sure the following
	 * copy_from_user() never exceeds the allocated buffer space.
	 */
	if (WARN_ON_ONCE(mex->inputdatalength > PAGE_SIZE))
		return -EINVAL;

	/* VUD.ciphertext */
	msg->length = mex->inputdatalength + 2;
	if (copy_from_user(msg->text, mex->inputdata, mex->inputdatalength))
		return -EFAULT;

	/* Set up key which is located after the variable length text. */
	size = zcrypt_type6_mex_key_en(mex, msg->text+mex->inputdatalength);
	if (size < 0)
		return size;
	size += sizeof(*msg) + mex->inputdatalength;

	/* message header, cprbx and f&r */
	msg->hdr = static_type6_hdrX;
	msg->hdr.ToCardLen1 = size - sizeof(msg->hdr);
	msg->hdr.FromCardLen1 = CEXXC_MAX_ICA_RESPONSE_SIZE - sizeof(msg->hdr);

	msg->cprbx = static_cprbx;
	msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid);
	msg->cprbx.rpl_msgbl = msg->hdr.FromCardLen1;

	msg->fr = static_pke_fnr;

	msg->cprbx.req_parml = size - sizeof(msg->hdr) - sizeof(msg->cprbx);

	ap_msg->length = size;
	return 0;
}

/**
 * Convert a ICACRT message to a type6 CRT message.
 *
 * @zq: crypto device pointer
 * @ap_msg: pointer to AP message
 * @crt: pointer to user input data
 *
 * Returns 0 on success or negative errno value.
 */
static int ICACRT_msg_to_type6CRT_msgX(struct zcrypt_queue *zq,
				       struct ap_message *ap_msg,
				       struct ica_rsa_modexpo_crt *crt)
{
	static struct type6_hdr static_type6_hdrX = {
		.type		=  0x06,
		.offset1	=  0x00000058,
		.agent_id	= {'C', 'A',},
		.function_code	= {'P', 'D'},
	};
	static struct function_and_rules_block static_pkd_fnr = {
		.function_code	= {'P', 'D'},
		.ulen		= 10,
		.only_rule	= {'Z', 'E', 'R', 'O', '-', 'P', 'A', 'D'}
	};

	struct {
		struct type6_hdr hdr;
		struct CPRBX cprbx;
		struct function_and_rules_block fr;
		unsigned short length;
		char text[0];
	} __packed * msg = ap_msg->message;
	int size;

	/*
	 * The inputdatalength was a selection criteria in the dispatching
	 * function zcrypt_rsa_crt(). However, make sure the following
	 * copy_from_user() never exceeds the allocated buffer space.
	 */
	if (WARN_ON_ONCE(crt->inputdatalength > PAGE_SIZE))
		return -EINVAL;

	/* VUD.ciphertext */
	msg->length = crt->inputdatalength + 2;
	if (copy_from_user(msg->text, crt->inputdata, crt->inputdatalength))
		return -EFAULT;

	/* Set up key which is located after the variable length text. */
	size = zcrypt_type6_crt_key(crt, msg->text + crt->inputdatalength);
	if (size < 0)
		return size;
	size += sizeof(*msg) + crt->inputdatalength;	/* total size of msg */

	/* message header, cprbx and f&r */
	msg->hdr = static_type6_hdrX;
	msg->hdr.ToCardLen1 = size -  sizeof(msg->hdr);
	msg->hdr.FromCardLen1 = CEXXC_MAX_ICA_RESPONSE_SIZE - sizeof(msg->hdr);

	msg->cprbx = static_cprbx;
	msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid);
	msg->cprbx.req_parml = msg->cprbx.rpl_msgbl =
		size - sizeof(msg->hdr) - sizeof(msg->cprbx);

	msg->fr = static_pkd_fnr;

	ap_msg->length = size;
	return 0;
}

/**
 * Convert a XCRB message to a type6 CPRB message.
 *
 * @zq: crypto device pointer
 * @ap_msg: pointer to AP message
 * @xcRB: pointer to user input data
 *
 * Returns 0 on success or -EFAULT, -EINVAL.
 */
struct type86_fmt2_msg {
	struct type86_hdr hdr;
	struct type86_fmt2_ext fmt2;
} __packed;

static int XCRB_msg_to_type6CPRB_msgX(struct ap_message *ap_msg,
				      struct ica_xcRB *xcRB,
				      unsigned int *fcode,
				      unsigned short **dom)
{
	static struct type6_hdr static_type6_hdrX = {
		.type		=  0x06,
		.offset1	=  0x00000058,
	};
	struct {
		struct type6_hdr hdr;
		struct CPRBX cprbx;
	} __packed * msg = ap_msg->message;

	int rcblen = CEIL4(xcRB->request_control_blk_length);
	int replylen, req_sumlen, resp_sumlen;
	char *req_data = ap_msg->message + sizeof(struct type6_hdr) + rcblen;
	char *function_code;

	if (CEIL4(xcRB->request_control_blk_length) <
			xcRB->request_control_blk_length)
		return -EINVAL; /* overflow after alignment*/

	/* length checks */
	ap_msg->length = sizeof(struct type6_hdr) +
		CEIL4(xcRB->request_control_blk_length) +
		xcRB->request_data_length;
	if (ap_msg->length > MSGTYPE06_MAX_MSG_SIZE)
		return -EINVAL;

	/*
	 * Overflow check
	 * sum must be greater (or equal) than the largest operand
	 */
	req_sumlen = CEIL4(xcRB->request_control_blk_length) +
			xcRB->request_data_length;
	if ((CEIL4(xcRB->request_control_blk_length) <=
						xcRB->request_data_length) ?
		(req_sumlen < xcRB->request_data_length) :
		(req_sumlen < CEIL4(xcRB->request_control_blk_length))) {
		return -EINVAL;
	}

	if (CEIL4(xcRB->reply_control_blk_length) <
			xcRB->reply_control_blk_length)
		return -EINVAL; /* overflow after alignment*/

	replylen = sizeof(struct type86_fmt2_msg) +
		CEIL4(xcRB->reply_control_blk_length) +
		xcRB->reply_data_length;
	if (replylen > MSGTYPE06_MAX_MSG_SIZE)
		return -EINVAL;

	/*
	 * Overflow check
	 * sum must be greater (or equal) than the largest operand
	 */
	resp_sumlen = CEIL4(xcRB->reply_control_blk_length) +
			xcRB->reply_data_length;
	if ((CEIL4(xcRB->reply_control_blk_length) <= xcRB->reply_data_length) ?
		(resp_sumlen < xcRB->reply_data_length) :
		(resp_sumlen < CEIL4(xcRB->reply_control_blk_length))) {
		return -EINVAL;
	}

	/* prepare type6 header */
	msg->hdr = static_type6_hdrX;
	memcpy(msg->hdr.agent_id, &(xcRB->agent_ID), sizeof(xcRB->agent_ID));
	msg->hdr.ToCardLen1 = xcRB->request_control_blk_length;
	if (xcRB->request_data_length) {
		msg->hdr.offset2 = msg->hdr.offset1 + rcblen;
		msg->hdr.ToCardLen2 = xcRB->request_data_length;
	}
	msg->hdr.FromCardLen1 = xcRB->reply_control_blk_length;
	msg->hdr.FromCardLen2 = xcRB->reply_data_length;

	/* prepare CPRB */
	if (copy_from_user(&(msg->cprbx), xcRB->request_control_blk_addr,
		    xcRB->request_control_blk_length))
		return -EFAULT;
	if (msg->cprbx.cprb_len + sizeof(msg->hdr.function_code) >
	    xcRB->request_control_blk_length)
		return -EINVAL;
	function_code = ((unsigned char *)&msg->cprbx) + msg->cprbx.cprb_len;
	memcpy(msg->hdr.function_code, function_code,
	       sizeof(msg->hdr.function_code));

	*fcode = (msg->hdr.function_code[0] << 8) | msg->hdr.function_code[1];
	*dom = (unsigned short *)&msg->cprbx.domain;

	if (memcmp(function_code, "US", 2) == 0
	    || memcmp(function_code, "AU", 2) == 0)
		ap_msg->special = 1;
	else
		ap_msg->special = 0;

	/* copy data block */
	if (xcRB->request_data_length &&
	    copy_from_user(req_data, xcRB->request_data_address,
		xcRB->request_data_length))
		return -EFAULT;

	return 0;
}

static int xcrb_msg_to_type6_ep11cprb_msgx(struct ap_message *ap_msg,
				       struct ep11_urb *xcRB,
				       unsigned int *fcode)
{
	unsigned int lfmt;
	static struct type6_hdr static_type6_ep11_hdr = {
		.type		=  0x06,
		.rqid		= {0x00, 0x01},
		.function_code	= {0x00, 0x00},
		.agent_id[0]	=  0x58,	/* {'X'} */
		.agent_id[1]	=  0x43,	/* {'C'} */
		.offset1	=  0x00000058,
	};

	struct {
		struct type6_hdr hdr;
		struct ep11_cprb cprbx;
		unsigned char	pld_tag;	/* fixed value 0x30 */
		unsigned char	pld_lenfmt;	/* payload length format */
	} __packed * msg = ap_msg->message;

	struct pld_hdr {
		unsigned char	func_tag;	/* fixed value 0x4 */
		unsigned char	func_len;	/* fixed value 0x4 */
		unsigned int	func_val;	/* function ID	   */
		unsigned char	dom_tag;	/* fixed value 0x4 */
		unsigned char	dom_len;	/* fixed value 0x4 */
		unsigned int	dom_val;	/* domain id	   */
	} __packed * payload_hdr = NULL;

	if (CEIL4(xcRB->req_len) < xcRB->req_len)
		return -EINVAL; /* overflow after alignment*/

	/* length checks */
	ap_msg->length = sizeof(struct type6_hdr) + xcRB->req_len;
	if (CEIL4(xcRB->req_len) > MSGTYPE06_MAX_MSG_SIZE -
				   (sizeof(struct type6_hdr)))
		return -EINVAL;

	if (CEIL4(xcRB->resp_len) < xcRB->resp_len)
		return -EINVAL; /* overflow after alignment*/

	if (CEIL4(xcRB->resp_len) > MSGTYPE06_MAX_MSG_SIZE -
				    (sizeof(struct type86_fmt2_msg)))
		return -EINVAL;

	/* prepare type6 header */
	msg->hdr = static_type6_ep11_hdr;
	msg->hdr.ToCardLen1   = xcRB->req_len;
	msg->hdr.FromCardLen1 = xcRB->resp_len;

	/* Import CPRB data from the ioctl input parameter */
	if (copy_from_user(&(msg->cprbx.cprb_len),
			   (char __force __user *)xcRB->req, xcRB->req_len)) {
		return -EFAULT;
	}

	if ((msg->pld_lenfmt & 0x80) == 0x80) { /*ext.len.fmt 2 or 3*/
		switch (msg->pld_lenfmt & 0x03) {
		case 1:
			lfmt = 2;
			break;
		case 2:
			lfmt = 3;
			break;
		default:
			return -EINVAL;
		}
	} else {
		lfmt = 1; /* length format #1 */
	}
	payload_hdr = (struct pld_hdr *)((&(msg->pld_lenfmt))+lfmt);
	*fcode = payload_hdr->func_val & 0xFFFF;

	return 0;
}

/**
 * Copy results from a type 86 ICA reply message back to user space.
 *
 * @zq: crypto device pointer
 * @reply: reply AP message.
 * @data: pointer to user output data
 * @length: size of user output data
 *
 * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error.
 */
struct type86x_reply {
	struct type86_hdr hdr;
	struct type86_fmt2_ext fmt2;
	struct CPRBX cprbx;
	unsigned char pad[4];	/* 4 byte function code/rules block ? */
	unsigned short length;
	char text[0];
} __packed;

struct type86_ep11_reply {
	struct type86_hdr hdr;
	struct type86_fmt2_ext fmt2;
	struct ep11_cprb cprbx;
} __packed;

static int convert_type86_ica(struct zcrypt_queue *zq,
			  struct ap_message *reply,
			  char __user *outputdata,
			  unsigned int outputdatalength)
{
	static unsigned char static_pad[] = {
		0x00, 0x02,
		0x1B, 0x7B, 0x5D, 0xB5, 0x75, 0x01, 0x3D, 0xFD,
		0x8D, 0xD1, 0xC7, 0x03, 0x2D, 0x09, 0x23, 0x57,
		0x89, 0x49, 0xB9, 0x3F, 0xBB, 0x99, 0x41, 0x5B,
		0x75, 0x21, 0x7B, 0x9D, 0x3B, 0x6B, 0x51, 0x39,
		0xBB, 0x0D, 0x35, 0xB9, 0x89, 0x0F, 0x93, 0xA5,
		0x0B, 0x47, 0xF1, 0xD3, 0xBB, 0xCB, 0xF1, 0x9D,
		0x23, 0x73, 0x71, 0xFF, 0xF3, 0xF5, 0x45, 0xFB,
		0x61, 0x29, 0x23, 0xFD, 0xF1, 0x29, 0x3F, 0x7F,
		0x17, 0xB7, 0x1B, 0xA9, 0x19, 0xBD, 0x57, 0xA9,
		0xD7, 0x95, 0xA3, 0xCB, 0xED, 0x1D, 0xDB, 0x45,
		0x7D, 0x11, 0xD1, 0x51, 0x1B, 0xED, 0x71, 0xE9,
		0xB1, 0xD1, 0xAB, 0xAB, 0x21, 0x2B, 0x1B, 0x9F,
		0x3B, 0x9F, 0xF7, 0xF7, 0xBD, 0x63, 0xEB, 0xAD,
		0xDF, 0xB3, 0x6F, 0x5B, 0xDB, 0x8D, 0xA9, 0x5D,
		0xE3, 0x7D, 0x77, 0x49, 0x47, 0xF5, 0xA7, 0xFD,
		0xAB, 0x2F, 0x27, 0x35, 0x77, 0xD3, 0x49, 0xC9,
		0x09, 0xEB, 0xB1, 0xF9, 0xBF, 0x4B, 0xCB, 0x2B,
		0xEB, 0xEB, 0x05, 0xFF, 0x7D, 0xC7, 0x91, 0x8B,
		0x09, 0x83, 0xB9, 0xB9, 0x69, 0x33, 0x39, 0x6B,
		0x79, 0x75, 0x19, 0xBF, 0xBB, 0x07, 0x1D, 0xBD,
		0x29, 0xBF, 0x39, 0x95, 0x93, 0x1D, 0x35, 0xC7,
		0xC9, 0x4D, 0xE5, 0x97, 0x0B, 0x43, 0x9B, 0xF1,
		0x16, 0x93, 0x03, 0x1F, 0xA5, 0xFB, 0xDB, 0xF3,
		0x27, 0x4F, 0x27, 0x61, 0x05, 0x1F, 0xB9, 0x23,
		0x2F, 0xC3, 0x81, 0xA9, 0x23, 0x71, 0x55, 0x55,
		0xEB, 0xED, 0x41, 0xE5, 0xF3, 0x11, 0xF1, 0x43,
		0x69, 0x03, 0xBD, 0x0B, 0x37, 0x0F, 0x51, 0x8F,
		0x0B, 0xB5, 0x89, 0x5B, 0x67, 0xA9, 0xD9, 0x4F,
		0x01, 0xF9, 0x21, 0x77, 0x37, 0x73, 0x79, 0xC5,
		0x7F, 0x51, 0xC1, 0xCF, 0x97, 0xA1, 0x75, 0xAD,
		0x35, 0x9D, 0xD3, 0xD3, 0xA7, 0x9D, 0x5D, 0x41,
		0x6F, 0x65, 0x1B, 0xCF, 0xA9, 0x87, 0x91, 0x09
	};
	struct type86x_reply *msg = reply->message;
	unsigned short service_rc, service_rs;
	unsigned int reply_len, pad_len;
	char *data;

	service_rc = msg->cprbx.ccp_rtcode;
	if (unlikely(service_rc != 0)) {
		service_rs = msg->cprbx.ccp_rscode;
		if ((service_rc == 8 && service_rs == 66) ||
		    (service_rc == 8 && service_rs == 65) ||
		    (service_rc == 8 && service_rs == 72) ||
		    (service_rc == 8 && service_rs == 770) ||
		    (service_rc == 12 && service_rs == 769)) {
			ZCRYPT_DBF(DBF_DEBUG,
				   "device=%02x.%04x rc/rs=%d/%d => rc=EINVAL\n",
				   AP_QID_CARD(zq->queue->qid),
				   AP_QID_QUEUE(zq->queue->qid),
				   (int) service_rc, (int) service_rs);
			return -EINVAL;
		}
		zq->online = 0;
		pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
		       AP_QID_CARD(zq->queue->qid),
		       AP_QID_QUEUE(zq->queue->qid));
		ZCRYPT_DBF(DBF_ERR,
			   "device=%02x.%04x rc/rs=%d/%d => online=0 rc=EAGAIN\n",
			   AP_QID_CARD(zq->queue->qid),
			   AP_QID_QUEUE(zq->queue->qid),
			   (int) service_rc, (int) service_rs);
		return -EAGAIN;	/* repeat the request on a different device. */
	}
	data = msg->text;
	reply_len = msg->length - 2;
	if (reply_len > outputdatalength)
		return -EINVAL;
	/*
	 * For all encipher requests, the length of the ciphertext (reply_len)
	 * will always equal the modulus length. For MEX decipher requests
	 * the output needs to get padded. Minimum pad size is 10.
	 *
	 * Currently, the cases where padding will be added is for:
	 * - PCIXCC_MCL2 using a CRT form token (since PKD didn't support
	 *   ZERO-PAD and CRT is only supported for PKD requests)
	 * - PCICC, always
	 */
	pad_len = outputdatalength - reply_len;
	if (pad_len > 0) {
		if (pad_len < 10)
			return -EINVAL;
		/* 'restore' padding left in the CEXXC card. */
		if (copy_to_user(outputdata, static_pad, pad_len - 1))
			return -EFAULT;
		if (put_user(0, outputdata + pad_len - 1))
			return -EFAULT;
	}
	/* Copy the crypto response to user space. */
	if (copy_to_user(outputdata + pad_len, data, reply_len))
		return -EFAULT;
	return 0;
}

/**
 * Copy results from a type 86 XCRB reply message back to user space.
 *
 * @zq: crypto device pointer
 * @reply: reply AP message.
 * @xcRB: pointer to XCRB
 *
 * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error.
 */
static int convert_type86_xcrb(struct zcrypt_queue *zq,
			       struct ap_message *reply,
			       struct ica_xcRB *xcRB)
{
	struct type86_fmt2_msg *msg = reply->message;
	char *data = reply->message;

	/* Copy CPRB to user */
	if (copy_to_user(xcRB->reply_control_blk_addr,
		data + msg->fmt2.offset1, msg->fmt2.count1))
		return -EFAULT;
	xcRB->reply_control_blk_length = msg->fmt2.count1;

	/* Copy data buffer to user */
	if (msg->fmt2.count2)
		if (copy_to_user(xcRB->reply_data_addr,
			data + msg->fmt2.offset2, msg->fmt2.count2))
			return -EFAULT;
	xcRB->reply_data_length = msg->fmt2.count2;
	return 0;
}

/**
 * Copy results from a type 86 EP11 XCRB reply message back to user space.
 *
 * @zq: crypto device pointer
 * @reply: reply AP message.
 * @xcRB: pointer to EP11 user request block
 *
 * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error.
 */
static int convert_type86_ep11_xcrb(struct zcrypt_queue *zq,
				    struct ap_message *reply,
				    struct ep11_urb *xcRB)
{
	struct type86_fmt2_msg *msg = reply->message;
	char *data = reply->message;

	if (xcRB->resp_len < msg->fmt2.count1)
		return -EINVAL;

	/* Copy response CPRB to user */
	if (copy_to_user((char __force __user *)xcRB->resp,
			 data + msg->fmt2.offset1, msg->fmt2.count1))
		return -EFAULT;
	xcRB->resp_len = msg->fmt2.count1;
	return 0;
}

static int convert_type86_rng(struct zcrypt_queue *zq,
			  struct ap_message *reply,
			  char *buffer)
{
	struct {
		struct type86_hdr hdr;
		struct type86_fmt2_ext fmt2;
		struct CPRBX cprbx;
	} __packed * msg = reply->message;
	char *data = reply->message;

	if (msg->cprbx.ccp_rtcode != 0 || msg->cprbx.ccp_rscode != 0)
		return -EINVAL;
	memcpy(buffer, data + msg->fmt2.offset2, msg->fmt2.count2);
	return msg->fmt2.count2;
}

static int convert_response_ica(struct zcrypt_queue *zq,
			    struct ap_message *reply,
			    char __user *outputdata,
			    unsigned int outputdatalength)
{
	struct type86x_reply *msg = reply->message;

	switch (msg->hdr.type) {
	case TYPE82_RSP_CODE:
	case TYPE88_RSP_CODE:
		return convert_error(zq, reply);
	case TYPE86_RSP_CODE:
		if (msg->cprbx.ccp_rtcode &&
		   (msg->cprbx.ccp_rscode == 0x14f) &&
		   (outputdatalength > 256)) {
			if (zq->zcard->max_exp_bit_length <= 17) {
				zq->zcard->max_exp_bit_length = 17;
				return -EAGAIN;
			} else
				return -EINVAL;
		}
		if (msg->hdr.reply_code)
			return convert_error(zq, reply);
		if (msg->cprbx.cprb_ver_id == 0x02)
			return convert_type86_ica(zq, reply,
						  outputdata, outputdatalength);
		/*
		 * Fall through, no break, incorrect cprb version is an unknown
		 * response
		 */
	default: /* Unknown response type, this should NEVER EVER happen */
		zq->online = 0;
		pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
		       AP_QID_CARD(zq->queue->qid),
		       AP_QID_QUEUE(zq->queue->qid));
		ZCRYPT_DBF(DBF_ERR,
			   "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n",
			   AP_QID_CARD(zq->queue->qid),
			   AP_QID_QUEUE(zq->queue->qid),
			   (int) msg->hdr.type);
		return -EAGAIN;	/* repeat the request on a different device. */
	}
}

static int convert_response_xcrb(struct zcrypt_queue *zq,
			    struct ap_message *reply,
			    struct ica_xcRB *xcRB)
{
	struct type86x_reply *msg = reply->message;

	switch (msg->hdr.type) {
	case TYPE82_RSP_CODE:
	case TYPE88_RSP_CODE:
		xcRB->status = 0x0008044DL; /* HDD_InvalidParm */
		return convert_error(zq, reply);
	case TYPE86_RSP_CODE:
		if (msg->hdr.reply_code) {
			memcpy(&(xcRB->status), msg->fmt2.apfs, sizeof(u32));
			return convert_error(zq, reply);
		}
		if (msg->cprbx.cprb_ver_id == 0x02)
			return convert_type86_xcrb(zq, reply, xcRB);
		/*
		 * Fall through, no break, incorrect cprb version is an unknown
		 * response
		 */
	default: /* Unknown response type, this should NEVER EVER happen */
		xcRB->status = 0x0008044DL; /* HDD_InvalidParm */
		zq->online = 0;
		pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
		       AP_QID_CARD(zq->queue->qid),
		       AP_QID_QUEUE(zq->queue->qid));
		ZCRYPT_DBF(DBF_ERR,
			   "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n",
			   AP_QID_CARD(zq->queue->qid),
			   AP_QID_QUEUE(zq->queue->qid),
			   (int) msg->hdr.type);
		return -EAGAIN;	/* repeat the request on a different device. */
	}
}

static int convert_response_ep11_xcrb(struct zcrypt_queue *zq,
	struct ap_message *reply, struct ep11_urb *xcRB)
{
	struct type86_ep11_reply *msg = reply->message;

	switch (msg->hdr.type) {
	case TYPE82_RSP_CODE:
	case TYPE87_RSP_CODE:
		return convert_error(zq, reply);
	case TYPE86_RSP_CODE:
		if (msg->hdr.reply_code)
			return convert_error(zq, reply);
		if (msg->cprbx.cprb_ver_id == 0x04)
			return convert_type86_ep11_xcrb(zq, reply, xcRB);
	/* Fall through, no break, incorrect cprb version is an unknown resp.*/
	default: /* Unknown response type, this should NEVER EVER happen */
		zq->online = 0;
		pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
		       AP_QID_CARD(zq->queue->qid),
		       AP_QID_QUEUE(zq->queue->qid));
		ZCRYPT_DBF(DBF_ERR,
			   "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n",
			   AP_QID_CARD(zq->queue->qid),
			   AP_QID_QUEUE(zq->queue->qid),
			   (int) msg->hdr.type);
		return -EAGAIN; /* repeat the request on a different device. */
	}
}

static int convert_response_rng(struct zcrypt_queue *zq,
				 struct ap_message *reply,
				 char *data)
{
	struct type86x_reply *msg = reply->message;

	switch (msg->hdr.type) {
	case TYPE82_RSP_CODE:
	case TYPE88_RSP_CODE:
		return -EINVAL;
	case TYPE86_RSP_CODE:
		if (msg->hdr.reply_code)
			return -EINVAL;
		if (msg->cprbx.cprb_ver_id == 0x02)
			return convert_type86_rng(zq, reply, data);
		/*
		 * Fall through, no break, incorrect cprb version is an unknown
		 * response
		 */
	default: /* Unknown response type, this should NEVER EVER happen */
		zq->online = 0;
		pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
		       AP_QID_CARD(zq->queue->qid),
		       AP_QID_QUEUE(zq->queue->qid));
		ZCRYPT_DBF(DBF_ERR,
			   "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n",
			   AP_QID_CARD(zq->queue->qid),
			   AP_QID_QUEUE(zq->queue->qid),
			   (int) msg->hdr.type);
		return -EAGAIN;	/* repeat the request on a different device. */
	}
}

/**
 * This function is called from the AP bus code after a crypto request
 * "msg" has finished with the reply message "reply".
 * It is called from tasklet context.
 * @aq: pointer to the AP queue
 * @msg: pointer to the AP message
 * @reply: pointer to the AP reply message
 */
static void zcrypt_msgtype6_receive(struct ap_queue *aq,
				  struct ap_message *msg,
				  struct ap_message *reply)
{
	static struct error_hdr error_reply = {
		.type = TYPE82_RSP_CODE,
		.reply_code = REP82_ERROR_MACHINE_FAILURE,
	};
	struct response_type *resp_type =
		(struct response_type *) msg->private;
	struct type86x_reply *t86r;
	int length;

	/* Copy the reply message to the request message buffer. */
	if (!reply)
		goto out;	/* ap_msg->rc indicates the error */
	t86r = reply->message;
	if (t86r->hdr.type == TYPE86_RSP_CODE &&
		 t86r->cprbx.cprb_ver_id == 0x02) {
		switch (resp_type->type) {
		case CEXXC_RESPONSE_TYPE_ICA:
			length = sizeof(struct type86x_reply)
				+ t86r->length - 2;
			length = min(CEXXC_MAX_ICA_RESPONSE_SIZE, length);
			memcpy(msg->message, reply->message, length);
			break;
		case CEXXC_RESPONSE_TYPE_XCRB:
			length = t86r->fmt2.offset2 + t86r->fmt2.count2;
			length = min(MSGTYPE06_MAX_MSG_SIZE, length);
			memcpy(msg->message, reply->message, length);
			break;
		default:
			memcpy(msg->message, &error_reply,
			       sizeof(error_reply));
		}
	} else
		memcpy(msg->message, reply->message, sizeof(error_reply));
out:
	complete(&(resp_type->work));
}

/**
 * This function is called from the AP bus code after a crypto request
 * "msg" has finished with the reply message "reply".
 * It is called from tasklet context.
 * @aq: pointer to the AP queue
 * @msg: pointer to the AP message
 * @reply: pointer to the AP reply message
 */
static void zcrypt_msgtype6_receive_ep11(struct ap_queue *aq,
					 struct ap_message *msg,
					 struct ap_message *reply)
{
	static struct error_hdr error_reply = {
		.type = TYPE82_RSP_CODE,
		.reply_code = REP82_ERROR_MACHINE_FAILURE,
	};
	struct response_type *resp_type =
		(struct response_type *)msg->private;
	struct type86_ep11_reply *t86r;
	int length;

	/* Copy the reply message to the request message buffer. */
	if (!reply)
		goto out;	/* ap_msg->rc indicates the error */
	t86r = reply->message;
	if (t86r->hdr.type == TYPE86_RSP_CODE &&
	    t86r->cprbx.cprb_ver_id == 0x04) {
		switch (resp_type->type) {
		case CEXXC_RESPONSE_TYPE_EP11:
			length = t86r->fmt2.offset1 + t86r->fmt2.count1;
			length = min(MSGTYPE06_MAX_MSG_SIZE, length);
			memcpy(msg->message, reply->message, length);
			break;
		default:
			memcpy(msg->message, &error_reply, sizeof(error_reply));
		}
	} else {
		memcpy(msg->message, reply->message, sizeof(error_reply));
	}
out:
	complete(&(resp_type->work));
}

static atomic_t zcrypt_step = ATOMIC_INIT(0);

/**
 * The request distributor calls this function if it picked the CEXxC
 * device to handle a modexpo request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *	CEXxC device to the request distributor
 * @mex: pointer to the modexpo request buffer
 */
static long zcrypt_msgtype6_modexpo(struct zcrypt_queue *zq,
				  struct ica_rsa_modexpo *mex)
{
	struct ap_message ap_msg;
	struct response_type resp_type = {
		.type = CEXXC_RESPONSE_TYPE_ICA,
	};
	int rc;

	ap_init_message(&ap_msg);
	ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
	if (!ap_msg.message)
		return -ENOMEM;
	ap_msg.receive = zcrypt_msgtype6_receive;
	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg.private = &resp_type;
	rc = ICAMEX_msg_to_type6MEX_msgX(zq, &ap_msg, mex);
	if (rc)
		goto out_free;
	init_completion(&resp_type.work);
	ap_queue_message(zq->queue, &ap_msg);
	rc = wait_for_completion_interruptible(&resp_type.work);
	if (rc == 0) {
		rc = ap_msg.rc;
		if (rc == 0)
			rc = convert_response_ica(zq, &ap_msg,
						  mex->outputdata,
						  mex->outputdatalength);
	} else
		/* Signal pending. */
		ap_cancel_message(zq->queue, &ap_msg);
out_free:
	free_page((unsigned long) ap_msg.message);
	return rc;
}

/**
 * The request distributor calls this function if it picked the CEXxC
 * device to handle a modexpo_crt request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *	CEXxC device to the request distributor
 * @crt: pointer to the modexpoc_crt request buffer
 */
static long zcrypt_msgtype6_modexpo_crt(struct zcrypt_queue *zq,
				      struct ica_rsa_modexpo_crt *crt)
{
	struct ap_message ap_msg;
	struct response_type resp_type = {
		.type = CEXXC_RESPONSE_TYPE_ICA,
	};
	int rc;

	ap_init_message(&ap_msg);
	ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
	if (!ap_msg.message)
		return -ENOMEM;
	ap_msg.receive = zcrypt_msgtype6_receive;
	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg.private = &resp_type;
	rc = ICACRT_msg_to_type6CRT_msgX(zq, &ap_msg, crt);
	if (rc)
		goto out_free;
	init_completion(&resp_type.work);
	ap_queue_message(zq->queue, &ap_msg);
	rc = wait_for_completion_interruptible(&resp_type.work);
	if (rc == 0) {
		rc = ap_msg.rc;
		if (rc == 0)
			rc = convert_response_ica(zq, &ap_msg,
						  crt->outputdata,
						  crt->outputdatalength);
	} else {
		/* Signal pending. */
		ap_cancel_message(zq->queue, &ap_msg);
	}
out_free:
	free_page((unsigned long) ap_msg.message);
	return rc;
}

/**
 * Fetch function code from cprb.
 * Extracting the fc requires to copy the cprb from userspace.
 * So this function allocates memory and needs an ap_msg prepared
 * by the caller with ap_init_message(). Also the caller has to
 * make sure ap_release_message() is always called even on failure.
 */
unsigned int get_cprb_fc(struct ica_xcRB *xcRB,
				struct ap_message *ap_msg,
				unsigned int *func_code, unsigned short **dom)
{
	struct response_type resp_type = {
		.type = CEXXC_RESPONSE_TYPE_XCRB,
	};

	ap_msg->message = kmalloc(MSGTYPE06_MAX_MSG_SIZE, GFP_KERNEL);
	if (!ap_msg->message)
		return -ENOMEM;
	ap_msg->receive = zcrypt_msgtype6_receive;
	ap_msg->psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg->private = kmemdup(&resp_type, sizeof(resp_type), GFP_KERNEL);
	if (!ap_msg->private)
		return -ENOMEM;
	return XCRB_msg_to_type6CPRB_msgX(ap_msg, xcRB, func_code, dom);
}

/**
 * The request distributor calls this function if it picked the CEXxC
 * device to handle a send_cprb request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *	CEXxC device to the request distributor
 * @xcRB: pointer to the send_cprb request buffer
 */
static long zcrypt_msgtype6_send_cprb(struct zcrypt_queue *zq,
				    struct ica_xcRB *xcRB,
				    struct ap_message *ap_msg)
{
	int rc;
	struct response_type *rtype = (struct response_type *)(ap_msg->private);

	init_completion(&rtype->work);
	ap_queue_message(zq->queue, ap_msg);
	rc = wait_for_completion_interruptible(&rtype->work);
	if (rc == 0) {
		rc = ap_msg->rc;
		if (rc == 0)
			rc = convert_response_xcrb(zq, ap_msg, xcRB);
	} else
		/* Signal pending. */
		ap_cancel_message(zq->queue, ap_msg);

	return rc;
}

/**
 * Fetch function code from ep11 cprb.
 * Extracting the fc requires to copy the ep11 cprb from userspace.
 * So this function allocates memory and needs an ap_msg prepared
 * by the caller with ap_init_message(). Also the caller has to
 * make sure ap_release_message() is always called even on failure.
 */
unsigned int get_ep11cprb_fc(struct ep11_urb *xcrb,
				    struct ap_message *ap_msg,
				    unsigned int *func_code)
{
	struct response_type resp_type = {
		.type = CEXXC_RESPONSE_TYPE_EP11,
	};

	ap_msg->message = kmalloc(MSGTYPE06_MAX_MSG_SIZE, GFP_KERNEL);
	if (!ap_msg->message)
		return -ENOMEM;
	ap_msg->receive = zcrypt_msgtype6_receive_ep11;
	ap_msg->psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg->private = kmemdup(&resp_type, sizeof(resp_type), GFP_KERNEL);
	if (!ap_msg->private)
		return -ENOMEM;
	return xcrb_msg_to_type6_ep11cprb_msgx(ap_msg, xcrb, func_code);
}

/**
 * The request distributor calls this function if it picked the CEX4P
 * device to handle a send_ep11_cprb request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *	  CEX4P device to the request distributor
 * @xcRB: pointer to the ep11 user request block
 */
static long zcrypt_msgtype6_send_ep11_cprb(struct zcrypt_queue *zq,
					   struct ep11_urb *xcrb,
					   struct ap_message *ap_msg)
{
	int rc;
	unsigned int lfmt;
	struct response_type *rtype = (struct response_type *)(ap_msg->private);
	struct {
		struct type6_hdr hdr;
		struct ep11_cprb cprbx;
		unsigned char	pld_tag;	/* fixed value 0x30 */
		unsigned char	pld_lenfmt;	/* payload length format */
	} __packed * msg = ap_msg->message;
	struct pld_hdr {
		unsigned char	func_tag;	/* fixed value 0x4 */
		unsigned char	func_len;	/* fixed value 0x4 */
		unsigned int	func_val;	/* function ID	   */
		unsigned char	dom_tag;	/* fixed value 0x4 */
		unsigned char	dom_len;	/* fixed value 0x4 */
		unsigned int	dom_val;	/* domain id	   */
	} __packed * payload_hdr = NULL;


	/**
	 * The target domain field within the cprb body/payload block will be
	 * replaced by the usage domain for non-management commands only.
	 * Therefore we check the first bit of the 'flags' parameter for
	 * management command indication.
	 *   0 - non management command
	 *   1 - management command
	 */
	if (!((msg->cprbx.flags & 0x80) == 0x80)) {
		msg->cprbx.target_id = (unsigned int)
					AP_QID_QUEUE(zq->queue->qid);

		if ((msg->pld_lenfmt & 0x80) == 0x80) { /*ext.len.fmt 2 or 3*/
			switch (msg->pld_lenfmt & 0x03) {
			case 1:
				lfmt = 2;
				break;
			case 2:
				lfmt = 3;
				break;
			default:
				return -EINVAL;
			}
		} else {
			lfmt = 1; /* length format #1 */
		}
		payload_hdr = (struct pld_hdr *)((&(msg->pld_lenfmt))+lfmt);
		payload_hdr->dom_val = (unsigned int)
					AP_QID_QUEUE(zq->queue->qid);
	}

	init_completion(&rtype->work);
	ap_queue_message(zq->queue, ap_msg);
	rc = wait_for_completion_interruptible(&rtype->work);
	if (rc == 0) {
		rc = ap_msg->rc;
		if (rc == 0)
			rc = convert_response_ep11_xcrb(zq, ap_msg, xcrb);
	} else
		/* Signal pending. */
		ap_cancel_message(zq->queue, ap_msg);

	return rc;
}

unsigned int get_rng_fc(struct ap_message *ap_msg, int *func_code,
						   unsigned int *domain)
{
	struct response_type resp_type = {
		.type = CEXXC_RESPONSE_TYPE_XCRB,
	};

	ap_msg->message = kmalloc(MSGTYPE06_MAX_MSG_SIZE, GFP_KERNEL);
	if (!ap_msg->message)
		return -ENOMEM;
	ap_msg->receive = zcrypt_msgtype6_receive;
	ap_msg->psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg->private = kmemdup(&resp_type, sizeof(resp_type), GFP_KERNEL);
	if (!ap_msg->private)
		return -ENOMEM;

	rng_type6CPRB_msgX(ap_msg, ZCRYPT_RNG_BUFFER_SIZE, domain);

	*func_code = HWRNG;
	return 0;
}

/**
 * The request distributor calls this function if it picked the CEXxC
 * device to generate random data.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *	CEXxC device to the request distributor
 * @buffer: pointer to a memory page to return random data
 */
static long zcrypt_msgtype6_rng(struct zcrypt_queue *zq,
				char *buffer, struct ap_message *ap_msg)
{
	struct {
		struct type6_hdr hdr;
		struct CPRBX cprbx;
		char function_code[2];
		short int rule_length;
		char rule[8];
		short int verb_length;
		short int key_length;
	} __packed * msg = ap_msg->message;
	struct response_type *rtype = (struct response_type *)(ap_msg->private);
	int rc;

	msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid);

	init_completion(&rtype->work);
	ap_queue_message(zq->queue, ap_msg);
	rc = wait_for_completion_interruptible(&rtype->work);
	if (rc == 0) {
		rc = ap_msg->rc;
		if (rc == 0)
			rc = convert_response_rng(zq, ap_msg, buffer);
	} else
		/* Signal pending. */
		ap_cancel_message(zq->queue, ap_msg);

	return rc;
}

/**
 * The crypto operations for a CEXxC card.
 */
static struct zcrypt_ops zcrypt_msgtype6_norng_ops = {
	.owner = THIS_MODULE,
	.name = MSGTYPE06_NAME,
	.variant = MSGTYPE06_VARIANT_NORNG,
	.rsa_modexpo = zcrypt_msgtype6_modexpo,
	.rsa_modexpo_crt = zcrypt_msgtype6_modexpo_crt,
	.send_cprb = zcrypt_msgtype6_send_cprb,
};

static struct zcrypt_ops zcrypt_msgtype6_ops = {
	.owner = THIS_MODULE,
	.name = MSGTYPE06_NAME,
	.variant = MSGTYPE06_VARIANT_DEFAULT,
	.rsa_modexpo = zcrypt_msgtype6_modexpo,
	.rsa_modexpo_crt = zcrypt_msgtype6_modexpo_crt,
	.send_cprb = zcrypt_msgtype6_send_cprb,
	.rng = zcrypt_msgtype6_rng,
};

static struct zcrypt_ops zcrypt_msgtype6_ep11_ops = {
	.owner = THIS_MODULE,
	.name = MSGTYPE06_NAME,
	.variant = MSGTYPE06_VARIANT_EP11,
	.rsa_modexpo = NULL,
	.rsa_modexpo_crt = NULL,
	.send_ep11_cprb = zcrypt_msgtype6_send_ep11_cprb,
};

void __init zcrypt_msgtype6_init(void)
{
	zcrypt_msgtype_register(&zcrypt_msgtype6_norng_ops);
	zcrypt_msgtype_register(&zcrypt_msgtype6_ops);
	zcrypt_msgtype_register(&zcrypt_msgtype6_ep11_ops);
}

void __exit zcrypt_msgtype6_exit(void)
{
	zcrypt_msgtype_unregister(&zcrypt_msgtype6_norng_ops);
	zcrypt_msgtype_unregister(&zcrypt_msgtype6_ops);
	zcrypt_msgtype_unregister(&zcrypt_msgtype6_ep11_ops);
}