include/scsi/iscsi_proto.h

   1 /*
   2  * RFC 3720 (iSCSI) protocol data types
   3  *
   4  * Copyright (C) 2005 Dmitry Yusupov
   5  * Copyright (C) 2005 Alex Aizman
   6  * maintained by open-iscsi@googlegroups.com
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published
  10  * by the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * General Public License for more details.
  17  *
  18  * See the file COPYING included with this distribution for more details.
  19  */
  20
  21 #ifndef ISCSI_PROTO_H
  22 #define ISCSI_PROTO_H
  23
  24 #define ISCSI_DRAFT20_VERSION   0x00
  25
  26 /* default iSCSI listen port for incoming connections */
  27 #define ISCSI_LISTEN_PORT       3260
  28
  29 /* Padding word length */
  30 #define PAD_WORD_LEN            4
  31
  32 /*
  33  * useful common(control and data pathes) macro
  34  */
  35 #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
  36 #define hton24(p, v) { \
  37         p[0] = (((v) >> 16) & 0xFF); \
  38         p[1] = (((v) >> 8) & 0xFF); \
  39         p[2] = ((v) & 0xFF); \
  40 }
  41 #define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
  42
  43 /*
  44  * iSCSI Template Message Header
  45  */
  46 struct iscsi_hdr {
  47         uint8_t         opcode;
  48         uint8_t         flags;          /* Final bit */
  49         uint8_t         rsvd2[2];
  50         uint8_t         hlength;        /* AHSs total length */
  51         uint8_t         dlength[3];     /* Data length */
  52         uint8_t         lun[8];
  53         __be32          itt;            /* Initiator Task Tag */
  54         __be32          ttt;            /* Target Task Tag */
  55         __be32          statsn;
  56         __be32          exp_statsn;
  57         __be32          max_statsn;
  58         uint8_t         other[12];
  59 };
  60
  61 /************************* RFC 3720 Begin *****************************/
  62
  63 #define ISCSI_RESERVED_TAG              0xffffffff
  64
  65 /* Opcode encoding bits */
  66 #define ISCSI_OP_RETRY                  0x80
  67 #define ISCSI_OP_IMMEDIATE              0x40
  68 #define ISCSI_OPCODE_MASK               0x3F
  69
  70 /* Initiator Opcode values */
  71 #define ISCSI_OP_NOOP_OUT               0x00
  72 #define ISCSI_OP_SCSI_CMD               0x01
  73 #define ISCSI_OP_SCSI_TMFUNC            0x02
  74 #define ISCSI_OP_LOGIN                  0x03
  75 #define ISCSI_OP_TEXT                   0x04
  76 #define ISCSI_OP_SCSI_DATA_OUT          0x05
  77 #define ISCSI_OP_LOGOUT                 0x06
  78 #define ISCSI_OP_SNACK                  0x10
  79
  80 #define ISCSI_OP_VENDOR1_CMD            0x1c
  81 #define ISCSI_OP_VENDOR2_CMD            0x1d
  82 #define ISCSI_OP_VENDOR3_CMD            0x1e
  83 #define ISCSI_OP_VENDOR4_CMD            0x1f
  84
  85 /* Target Opcode values */
  86 #define ISCSI_OP_NOOP_IN                0x20
  87 #define ISCSI_OP_SCSI_CMD_RSP           0x21
  88 #define ISCSI_OP_SCSI_TMFUNC_RSP        0x22
  89 #define ISCSI_OP_LOGIN_RSP              0x23
  90 #define ISCSI_OP_TEXT_RSP               0x24
  91 #define ISCSI_OP_SCSI_DATA_IN           0x25
  92 #define ISCSI_OP_LOGOUT_RSP             0x26
  93 #define ISCSI_OP_R2T                    0x31
  94 #define ISCSI_OP_ASYNC_EVENT            0x32
  95 #define ISCSI_OP_REJECT                 0x3f
  96
  97 struct iscsi_ahs_hdr {
  98         __be16 ahslength;
  99         uint8_t ahstype;
 100         uint8_t ahspec[5];
 101 };
 102
 103 #define ISCSI_AHSTYPE_CDB               1
 104 #define ISCSI_AHSTYPE_RLENGTH           2
 105
 106 /* iSCSI PDU Header */
 107 struct iscsi_cmd {
 108         uint8_t opcode;
 109         uint8_t flags;
 110         __be16 rsvd2;
 111         uint8_t hlength;
 112         uint8_t dlength[3];
 113         uint8_t lun[8];
 114         __be32 itt;     /* Initiator Task Tag */
 115         __be32 data_length;
 116         __be32 cmdsn;
 117         __be32 exp_statsn;
 118         uint8_t cdb[16];        /* SCSI Command Block */
 119         /* Additional Data (Command Dependent) */
 120 };
 121
 122 /* Command PDU flags */
 123 #define ISCSI_FLAG_CMD_FINAL            0x80
 124 #define ISCSI_FLAG_CMD_READ             0x40
 125 #define ISCSI_FLAG_CMD_WRITE            0x20
 126 #define ISCSI_FLAG_CMD_ATTR_MASK        0x07    /* 3 bits */
 127
 128 /* SCSI Command Attribute values */
 129 #define ISCSI_ATTR_UNTAGGED             0
 130 #define ISCSI_ATTR_SIMPLE               1
 131 #define ISCSI_ATTR_ORDERED              2
 132 #define ISCSI_ATTR_HEAD_OF_QUEUE        3
 133 #define ISCSI_ATTR_ACA                  4
 134
 135 struct iscsi_rlength_ahdr {
 136         __be16 ahslength;
 137         uint8_t ahstype;
 138         uint8_t reserved;
 139         __be32 read_length;
 140 };
 141
 142 /* SCSI Response Header */
 143 struct iscsi_cmd_rsp {
 144         uint8_t opcode;
 145         uint8_t flags;
 146         uint8_t response;
 147         uint8_t cmd_status;
 148         uint8_t hlength;
 149         uint8_t dlength[3];
 150         uint8_t rsvd[8];
 151         __be32  itt;    /* Initiator Task Tag */
 152         __be32  rsvd1;
 153         __be32  statsn;
 154         __be32  exp_cmdsn;
 155         __be32  max_cmdsn;
 156         __be32  exp_datasn;
 157         __be32  bi_residual_count;
 158         __be32  residual_count;
 159         /* Response or Sense Data (optional) */
 160 };
 161
 162 /* Command Response PDU flags */
 163 #define ISCSI_FLAG_CMD_BIDI_OVERFLOW    0x10
 164 #define ISCSI_FLAG_CMD_BIDI_UNDERFLOW   0x08
 165 #define ISCSI_FLAG_CMD_OVERFLOW         0x04
 166 #define ISCSI_FLAG_CMD_UNDERFLOW        0x02
 167
 168 /* iSCSI Status values. Valid if Rsp Selector bit is not set */
 169 #define ISCSI_STATUS_CMD_COMPLETED      0
 170 #define ISCSI_STATUS_TARGET_FAILURE     1
 171 #define ISCSI_STATUS_SUBSYS_FAILURE     2
 172
 173 /* Asynchronous Event Header */
 174 struct iscsi_async {
 175         uint8_t opcode;
 176         uint8_t flags;
 177         uint8_t rsvd2[2];
 178         uint8_t rsvd3;
 179         uint8_t dlength[3];
 180         uint8_t lun[8];
 181         uint8_t rsvd4[8];
 182         __be32  statsn;
 183         __be32  exp_cmdsn;
 184         __be32  max_cmdsn;
 185         uint8_t async_event;
 186         uint8_t async_vcode;
 187         __be16  param1;
 188         __be16  param2;
 189         __be16  param3;
 190         uint8_t rsvd5[4];
 191 };
 192
 193 /* iSCSI Event Codes */
 194 #define ISCSI_ASYNC_MSG_SCSI_EVENT                      0
 195 #define ISCSI_ASYNC_MSG_REQUEST_LOGOUT                  1
 196 #define ISCSI_ASYNC_MSG_DROPPING_CONNECTION             2
 197 #define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS        3
 198 #define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION               4
 199 #define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC                 255
 200
 201 /* NOP-Out Message */
 202 struct iscsi_nopout {
 203         uint8_t opcode;
 204         uint8_t flags;
 205         __be16  rsvd2;
 206         uint8_t rsvd3;
 207         uint8_t dlength[3];
 208         uint8_t lun[8];
 209         __be32  itt;    /* Initiator Task Tag */
 210         __be32  ttt;    /* Target Transfer Tag */
 211         __be32  cmdsn;
 212         __be32  exp_statsn;
 213         uint8_t rsvd4[16];
 214 };
 215
 216 /* NOP-In Message */
 217 struct iscsi_nopin {
 218         uint8_t opcode;
 219         uint8_t flags;
 220         __be16  rsvd2;
 221         uint8_t rsvd3;
 222         uint8_t dlength[3];
 223         uint8_t lun[8];
 224         __be32  itt;    /* Initiator Task Tag */
 225         __be32  ttt;    /* Target Transfer Tag */
 226         __be32  statsn;
 227         __be32  exp_cmdsn;
 228         __be32  max_cmdsn;
 229         uint8_t rsvd4[12];
 230 };
 231
 232 /* SCSI Task Management Message Header */
 233 struct iscsi_tm {
 234         uint8_t opcode;
 235         uint8_t flags;
 236         uint8_t rsvd1[2];
 237         uint8_t hlength;
 238         uint8_t dlength[3];
 239         uint8_t lun[8];
 240         __be32  itt;    /* Initiator Task Tag */
 241         __be32  rtt;    /* Reference Task Tag */
 242         __be32  cmdsn;
 243         __be32  exp_statsn;
 244         __be32  refcmdsn;
 245         __be32  exp_datasn;
 246         uint8_t rsvd2[8];
 247 };
 248
 249 #define ISCSI_FLAG_TM_FUNC_MASK                 0x7F
 250
 251 /* Function values */
 252 #define ISCSI_TM_FUNC_ABORT_TASK                1
 253 #define ISCSI_TM_FUNC_ABORT_TASK_SET            2
 254 #define ISCSI_TM_FUNC_CLEAR_ACA                 3
 255 #define ISCSI_TM_FUNC_CLEAR_TASK_SET            4
 256 #define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET        5
 257 #define ISCSI_TM_FUNC_TARGET_WARM_RESET         6
 258 #define ISCSI_TM_FUNC_TARGET_COLD_RESET         7
 259 #define ISCSI_TM_FUNC_TASK_REASSIGN             8
 260
 261 /* SCSI Task Management Response Header */
 262 struct iscsi_tm_rsp {
 263         uint8_t opcode;
 264         uint8_t flags;
 265         uint8_t response;       /* see Response values below */
 266         uint8_t qualifier;
 267         uint8_t hlength;
 268         uint8_t dlength[3];
 269         uint8_t rsvd2[8];
 270         __be32  itt;    /* Initiator Task Tag */
 271         __be32  rtt;    /* Reference Task Tag */
 272         __be32  statsn;
 273         __be32  exp_cmdsn;
 274         __be32  max_cmdsn;
 275         uint8_t rsvd3[12];
 276 };
 277
 278 /* Response values */
 279 #define ISCSI_TMF_RSP_COMPLETE          0x00
 280 #define ISCSI_TMF_RSP_NO_TASK           0x01
 281 #define ISCSI_TMF_RSP_NO_LUN            0x02
 282 #define ISCSI_TMF_RSP_TASK_ALLEGIANT    0x03
 283 #define ISCSI_TMF_RSP_NO_FAILOVER       0x04
 284 #define ISCSI_TMF_RSP_NOT_SUPPORTED     0x05
 285 #define ISCSI_TMF_RSP_AUTH_FAILED       0x06
 286 #define ISCSI_TMF_RSP_REJECTED          0xff
 287
 288 /* Ready To Transfer Header */
 289 struct iscsi_r2t_rsp {
 290         uint8_t opcode;
 291         uint8_t flags;
 292         uint8_t rsvd2[2];
 293         uint8_t hlength;
 294         uint8_t dlength[3];
 295         uint8_t lun[8];
 296         __be32  itt;    /* Initiator Task Tag */
 297         __be32  ttt;    /* Target Transfer Tag */
 298         __be32  statsn;
 299         __be32  exp_cmdsn;
 300         __be32  max_cmdsn;
 301         __be32  r2tsn;
 302         __be32  data_offset;
 303         __be32  data_length;
 304 };
 305
 306 /* SCSI Data Hdr */
 307 struct iscsi_data {
 308         uint8_t opcode;
 309         uint8_t flags;
 310         uint8_t rsvd2[2];
 311         uint8_t rsvd3;
 312         uint8_t dlength[3];
 313         uint8_t lun[8];
 314         __be32  itt;
 315         __be32  ttt;
 316         __be32  rsvd4;
 317         __be32  exp_statsn;
 318         __be32  rsvd5;
 319         __be32  datasn;
 320         __be32  offset;
 321         __be32  rsvd6;
 322         /* Payload */
 323 };
 324
 325 /* SCSI Data Response Hdr */
 326 struct iscsi_data_rsp {
 327         uint8_t opcode;
 328         uint8_t flags;
 329         uint8_t rsvd2;
 330         uint8_t cmd_status;
 331         uint8_t hlength;
 332         uint8_t dlength[3];
 333         uint8_t lun[8];
 334         __be32  itt;
 335         __be32  ttt;
 336         __be32  statsn;
 337         __be32  exp_cmdsn;
 338         __be32  max_cmdsn;
 339         __be32  datasn;
 340         __be32  offset;
 341         __be32  residual_count;
 342 };
 343
 344 /* Data Response PDU flags */
 345 #define ISCSI_FLAG_DATA_ACK             0x40
 346 #define ISCSI_FLAG_DATA_OVERFLOW        0x04
 347 #define ISCSI_FLAG_DATA_UNDERFLOW       0x02
 348 #define ISCSI_FLAG_DATA_STATUS          0x01
 349
 350 /* Text Header */
 351 struct iscsi_text {
 352         uint8_t opcode;
 353         uint8_t flags;
 354         uint8_t rsvd2[2];
 355         uint8_t hlength;
 356         uint8_t dlength[3];
 357         uint8_t rsvd4[8];
 358         __be32  itt;
 359         __be32  ttt;
 360         __be32  cmdsn;
 361         __be32  exp_statsn;
 362         uint8_t rsvd5[16];
 363         /* Text - key=value pairs */
 364 };
 365
 366 #define ISCSI_FLAG_TEXT_CONTINUE        0x40
 367
 368 /* Text Response Header */
 369 struct iscsi_text_rsp {
 370         uint8_t opcode;
 371         uint8_t flags;
 372         uint8_t rsvd2[2];
 373         uint8_t hlength;
 374         uint8_t dlength[3];
 375         uint8_t rsvd4[8];
 376         __be32  itt;
 377         __be32  ttt;
 378         __be32  statsn;
 379         __be32  exp_cmdsn;
 380         __be32  max_cmdsn;
 381         uint8_t rsvd5[12];
 382         /* Text Response - key:value pairs */
 383 };
 384
 385 /* Login Header */
 386 struct iscsi_login {
 387         uint8_t opcode;
 388         uint8_t flags;
 389         uint8_t max_version;    /* Max. version supported */
 390         uint8_t min_version;    /* Min. version supported */
 391         uint8_t hlength;
 392         uint8_t dlength[3];
 393         uint8_t isid[6];        /* Initiator Session ID */
 394         __be16  tsih;   /* Target Session Handle */
 395         __be32  itt;    /* Initiator Task Tag */
 396         __be16  cid;
 397         __be16  rsvd3;
 398         __be32  cmdsn;
 399         __be32  exp_statsn;
 400         uint8_t rsvd5[16];
 401 };
 402
 403 /* Login PDU flags */
 404 #define ISCSI_FLAG_LOGIN_TRANSIT                0x80
 405 #define ISCSI_FLAG_LOGIN_CONTINUE               0x40
 406 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK     0x0C    /* 2 bits */
 407 #define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK        0x03    /* 2 bits */
 408
 409 #define ISCSI_LOGIN_CURRENT_STAGE(flags) \
 410         ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
 411 #define ISCSI_LOGIN_NEXT_STAGE(flags) \
 412         (flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
 413
 414 /* Login Response Header */
 415 struct iscsi_login_rsp {
 416         uint8_t opcode;
 417         uint8_t flags;
 418         uint8_t max_version;    /* Max. version supported */
 419         uint8_t active_version; /* Active version */
 420         uint8_t hlength;
 421         uint8_t dlength[3];
 422         uint8_t isid[6];        /* Initiator Session ID */
 423         __be16  tsih;   /* Target Session Handle */
 424         __be32  itt;    /* Initiator Task Tag */
 425         __be32  rsvd3;
 426         __be32  statsn;
 427         __be32  exp_cmdsn;
 428         __be32  max_cmdsn;
 429         uint8_t status_class;   /* see Login RSP ststus classes below */
 430         uint8_t status_detail;  /* see Login RSP Status details below */
 431         uint8_t rsvd4[10];
 432 };
 433
 434 /* Login stage (phase) codes for CSG, NSG */
 435 #define ISCSI_INITIAL_LOGIN_STAGE               -1
 436 #define ISCSI_SECURITY_NEGOTIATION_STAGE        0
 437 #define ISCSI_OP_PARMS_NEGOTIATION_STAGE        1
 438 #define ISCSI_FULL_FEATURE_PHASE                3
 439
 440 /* Login Status response classes */
 441 #define ISCSI_STATUS_CLS_SUCCESS                0x00
 442 #define ISCSI_STATUS_CLS_REDIRECT               0x01
 443 #define ISCSI_STATUS_CLS_INITIATOR_ERR          0x02
 444 #define ISCSI_STATUS_CLS_TARGET_ERR             0x03
 445
 446 /* Login Status response detail codes */
 447 /* Class-0 (Success) */
 448 #define ISCSI_LOGIN_STATUS_ACCEPT               0x00
 449
 450 /* Class-1 (Redirection) */
 451 #define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP       0x01
 452 #define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM       0x02
 453
 454 /* Class-2 (Initiator Error) */
 455 #define ISCSI_LOGIN_STATUS_INIT_ERR             0x00
 456 #define ISCSI_LOGIN_STATUS_AUTH_FAILED          0x01
 457 #define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN        0x02
 458 #define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND        0x03
 459 #define ISCSI_LOGIN_STATUS_TGT_REMOVED          0x04
 460 #define ISCSI_LOGIN_STATUS_NO_VERSION           0x05
 461 #define ISCSI_LOGIN_STATUS_ISID_ERROR           0x06
 462 #define ISCSI_LOGIN_STATUS_MISSING_FIELDS       0x07
 463 #define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED      0x08
 464 #define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE      0x09
 465 #define ISCSI_LOGIN_STATUS_NO_SESSION           0x0a
 466 #define ISCSI_LOGIN_STATUS_INVALID_REQUEST      0x0b
 467
 468 /* Class-3 (Target Error) */
 469 #define ISCSI_LOGIN_STATUS_TARGET_ERROR         0x00
 470 #define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE      0x01
 471 #define ISCSI_LOGIN_STATUS_NO_RESOURCES         0x02
 472
 473 /* Logout Header */
 474 struct iscsi_logout {
 475         uint8_t opcode;
 476         uint8_t flags;
 477         uint8_t rsvd1[2];
 478         uint8_t hlength;
 479         uint8_t dlength[3];
 480         uint8_t rsvd2[8];
 481         __be32  itt;    /* Initiator Task Tag */
 482         __be16  cid;
 483         uint8_t rsvd3[2];
 484         __be32  cmdsn;
 485         __be32  exp_statsn;
 486         uint8_t rsvd4[16];
 487 };
 488
 489 /* Logout PDU flags */
 490 #define ISCSI_FLAG_LOGOUT_REASON_MASK   0x7F
 491
 492 /* logout reason_code values */
 493
 494 #define ISCSI_LOGOUT_REASON_CLOSE_SESSION       0
 495 #define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION    1
 496 #define ISCSI_LOGOUT_REASON_RECOVERY            2
 497 #define ISCSI_LOGOUT_REASON_AEN_REQUEST         3
 498
 499 /* Logout Response Header */
 500 struct iscsi_logout_rsp {
 501         uint8_t opcode;
 502         uint8_t flags;
 503         uint8_t response;       /* see Logout response values below */
 504         uint8_t rsvd2;
 505         uint8_t hlength;
 506         uint8_t dlength[3];
 507         uint8_t rsvd3[8];
 508         __be32  itt;    /* Initiator Task Tag */
 509         __be32  rsvd4;
 510         __be32  statsn;
 511         __be32  exp_cmdsn;
 512         __be32  max_cmdsn;
 513         __be32  rsvd5;
 514         __be16  t2wait;
 515         __be16  t2retain;
 516         __be32  rsvd6;
 517 };
 518
 519 /* logout response status values */
 520
 521 #define ISCSI_LOGOUT_SUCCESS                    0
 522 #define ISCSI_LOGOUT_CID_NOT_FOUND              1
 523 #define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED       2
 524 #define ISCSI_LOGOUT_CLEANUP_FAILED             3
 525
 526 /* SNACK Header */
 527 struct iscsi_snack {
 528         uint8_t opcode;
 529         uint8_t flags;
 530         uint8_t rsvd2[14];
 531         __be32  itt;
 532         __be32  begrun;
 533         __be32  runlength;
 534         __be32  exp_statsn;
 535         __be32  rsvd3;
 536         __be32  exp_datasn;
 537         uint8_t rsvd6[8];
 538 };
 539
 540 /* SNACK PDU flags */
 541 #define ISCSI_FLAG_SNACK_TYPE_MASK      0x0F    /* 4 bits */
 542
 543 /* Reject Message Header */
 544 struct iscsi_reject {
 545         uint8_t opcode;
 546         uint8_t flags;
 547         uint8_t reason;
 548         uint8_t rsvd2;
 549         uint8_t hlength;
 550         uint8_t dlength[3];
 551         uint8_t rsvd3[8];
 552         __be32  ffffffff;
 553         uint8_t rsvd4[4];
 554         __be32  statsn;
 555         __be32  exp_cmdsn;
 556         __be32  max_cmdsn;
 557         __be32  datasn;
 558         uint8_t rsvd5[8];
 559         /* Text - Rejected hdr */
 560 };
 561
 562 /* Reason for Reject */
 563 #define ISCSI_REASON_CMD_BEFORE_LOGIN   1
 564 #define ISCSI_REASON_DATA_DIGEST_ERROR  2
 565 #define ISCSI_REASON_DATA_SNACK_REJECT  3
 566 #define ISCSI_REASON_PROTOCOL_ERROR     4
 567 #define ISCSI_REASON_CMD_NOT_SUPPORTED  5
 568 #define ISCSI_REASON_IMM_CMD_REJECT             6
 569 #define ISCSI_REASON_TASK_IN_PROGRESS   7
 570 #define ISCSI_REASON_INVALID_SNACK              8
 571 #define ISCSI_REASON_BOOKMARK_INVALID   9
 572 #define ISCSI_REASON_BOOKMARK_NO_RESOURCES      10
 573 #define ISCSI_REASON_NEGOTIATION_RESET  11
 574
 575 /* Max. number of Key=Value pairs in a text message */
 576 #define MAX_KEY_VALUE_PAIRS     8192
 577
 578 /* maximum length for text keys/values */
 579 #define KEY_MAXLEN              64
 580 #define VALUE_MAXLEN            255
 581 #define TARGET_NAME_MAXLEN      VALUE_MAXLEN
 582
 583 #define DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH    8192
 584
 585 /************************* RFC 3720 End *****************************/
 586
 587 #endif /* ISCSI_PROTO_H */