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_VERSION_STR       "0.3"
  25 #define ISCSI_DATE_STR          "22-Apr-2005"
  26 #define ISCSI_DRAFT20_VERSION   0x00
  27
  28 /* default iSCSI listen port for incoming connections */
  29 #define ISCSI_LISTEN_PORT       3260
  30
  31 /* Padding word length */
  32 #define PAD_WORD_LEN            4
  33
  34 /*
  35  * useful common(control and data pathes) macro
  36  */
  37 #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
  38 #define hton24(p, v) { \
  39         p[0] = (((v) >> 16) & 0xFF); \
  40         p[1] = (((v) >> 8) & 0xFF); \
  41         p[2] = ((v) & 0xFF); \
  42 }
  43 #define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
  44
  45 /*
  46  * iSCSI Template Message Header
  47  */
  48 struct iscsi_hdr {
  49         uint8_t         opcode;
  50         uint8_t         flags;          /* Final bit */
  51         uint8_t         rsvd2[2];
  52         uint8_t         hlength;        /* AHSs total length */
  53         uint8_t         dlength[3];     /* Data length */
  54         uint8_t         lun[8];
  55         __be32          itt;            /* Initiator Task Tag */
  56         __be32          ttt;            /* Target Task Tag */
  57         __be32          statsn;
  58         __be32          exp_statsn;
  59         __be32          max_statsn;
  60         uint8_t         other[12];
  61 };
  62
  63 /************************* RFC 3720 Begin *****************************/
  64
  65 #define ISCSI_RESERVED_TAG              0xffffffff
  66
  67 /* Opcode encoding bits */
  68 #define ISCSI_OP_RETRY                  0x80
  69 #define ISCSI_OP_IMMEDIATE              0x40
  70 #define ISCSI_OPCODE_MASK               0x3F
  71
  72 /* Initiator Opcode values */
  73 #define ISCSI_OP_NOOP_OUT               0x00
  74 #define ISCSI_OP_SCSI_CMD               0x01
  75 #define ISCSI_OP_SCSI_TMFUNC            0x02
  76 #define ISCSI_OP_LOGIN                  0x03
  77 #define ISCSI_OP_TEXT                   0x04
  78 #define ISCSI_OP_SCSI_DATA_OUT          0x05
  79 #define ISCSI_OP_LOGOUT                 0x06
  80 #define ISCSI_OP_SNACK                  0x10
  81
  82 #define ISCSI_OP_VENDOR1_CMD            0x1c
  83 #define ISCSI_OP_VENDOR2_CMD            0x1d
  84 #define ISCSI_OP_VENDOR3_CMD            0x1e
  85 #define ISCSI_OP_VENDOR4_CMD            0x1f
  86
  87 /* Target Opcode values */
  88 #define ISCSI_OP_NOOP_IN                0x20
  89 #define ISCSI_OP_SCSI_CMD_RSP           0x21
  90 #define ISCSI_OP_SCSI_TMFUNC_RSP        0x22
  91 #define ISCSI_OP_LOGIN_RSP              0x23
  92 #define ISCSI_OP_TEXT_RSP               0x24
  93 #define ISCSI_OP_SCSI_DATA_IN           0x25
  94 #define ISCSI_OP_LOGOUT_RSP             0x26
  95 #define ISCSI_OP_R2T                    0x31
  96 #define ISCSI_OP_ASYNC_EVENT            0x32
  97 #define ISCSI_OP_REJECT                 0x3f
  98
  99 struct iscsi_ahs_hdr {
 100         __be16 ahslength;
 101         uint8_t ahstype;
 102         uint8_t ahspec[5];
 103 };
 104
 105 #define ISCSI_AHSTYPE_CDB               1
 106 #define ISCSI_AHSTYPE_RLENGTH           2
 107
 108 /* iSCSI PDU Header */
 109 struct iscsi_cmd {
 110         uint8_t opcode;
 111         uint8_t flags;
 112         __be16 rsvd2;
 113         uint8_t hlength;
 114         uint8_t dlength[3];
 115         uint8_t lun[8];
 116         __be32 itt;     /* Initiator Task Tag */
 117         __be32 data_length;
 118         __be32 cmdsn;
 119         __be32 exp_statsn;
 120         uint8_t cdb[16];        /* SCSI Command Block */
 121         /* Additional Data (Command Dependent) */
 122 };
 123
 124 /* Command PDU flags */
 125 #define ISCSI_FLAG_CMD_FINAL            0x80
 126 #define ISCSI_FLAG_CMD_READ             0x40
 127 #define ISCSI_FLAG_CMD_WRITE            0x20
 128 #define ISCSI_FLAG_CMD_ATTR_MASK        0x07    /* 3 bits */
 129
 130 /* SCSI Command Attribute values */
 131 #define ISCSI_ATTR_UNTAGGED             0
 132 #define ISCSI_ATTR_SIMPLE               1
 133 #define ISCSI_ATTR_ORDERED              2
 134 #define ISCSI_ATTR_HEAD_OF_QUEUE        3
 135 #define ISCSI_ATTR_ACA                  4
 136
 137 struct iscsi_rlength_ahdr {
 138         __be16 ahslength;
 139         uint8_t ahstype;
 140         uint8_t reserved;
 141         __be32 read_length;
 142 };
 143
 144 /* SCSI Response Header */
 145 struct iscsi_cmd_rsp {
 146         uint8_t opcode;
 147         uint8_t flags;
 148         uint8_t response;
 149         uint8_t cmd_status;
 150         uint8_t hlength;
 151         uint8_t dlength[3];
 152         uint8_t rsvd[8];
 153         __be32  itt;    /* Initiator Task Tag */
 154         __be32  rsvd1;
 155         __be32  statsn;
 156         __be32  exp_cmdsn;
 157         __be32  max_cmdsn;
 158         __be32  exp_datasn;
 159         __be32  bi_residual_count;
 160         __be32  residual_count;
 161         /* Response or Sense Data (optional) */
 162 };
 163
 164 /* Command Response PDU flags */
 165 #define ISCSI_FLAG_CMD_BIDI_OVERFLOW    0x10
 166 #define ISCSI_FLAG_CMD_BIDI_UNDERFLOW   0x08
 167 #define ISCSI_FLAG_CMD_OVERFLOW         0x04
 168 #define ISCSI_FLAG_CMD_UNDERFLOW        0x02
 169
 170 /* iSCSI Status values. Valid if Rsp Selector bit is not set */
 171 #define ISCSI_STATUS_CMD_COMPLETED      0
 172 #define ISCSI_STATUS_TARGET_FAILURE     1
 173 #define ISCSI_STATUS_SUBSYS_FAILURE     2
 174
 175 /* Asynchronous Event Header */
 176 struct iscsi_async {
 177         uint8_t opcode;
 178         uint8_t flags;
 179         uint8_t rsvd2[2];
 180         uint8_t rsvd3;
 181         uint8_t dlength[3];
 182         uint8_t lun[8];
 183         uint8_t rsvd4[8];
 184         __be32  statsn;
 185         __be32  exp_cmdsn;
 186         __be32  max_cmdsn;
 187         uint8_t async_event;
 188         uint8_t async_vcode;
 189         __be16  param1;
 190         __be16  param2;
 191         __be16  param3;
 192         uint8_t rsvd5[4];
 193 };
 194
 195 /* iSCSI Event Codes */
 196 #define ISCSI_ASYNC_MSG_SCSI_EVENT                      0
 197 #define ISCSI_ASYNC_MSG_REQUEST_LOGOUT                  1
 198 #define ISCSI_ASYNC_MSG_DROPPING_CONNECTION             2
 199 #define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS        3
 200 #define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION               4
 201 #define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC                 255
 202
 203 /* NOP-Out Message */
 204 struct iscsi_nopout {
 205         uint8_t opcode;
 206         uint8_t flags;
 207         __be16  rsvd2;
 208         uint8_t rsvd3;
 209         uint8_t dlength[3];
 210         uint8_t lun[8];
 211         __be32  itt;    /* Initiator Task Tag */
 212         __be32  ttt;    /* Target Transfer Tag */
 213         __be32  cmdsn;
 214         __be32  exp_statsn;
 215         uint8_t rsvd4[16];
 216 };
 217
 218 /* NOP-In Message */
 219 struct iscsi_nopin {
 220         uint8_t opcode;
 221         uint8_t flags;
 222         __be16  rsvd2;
 223         uint8_t rsvd3;
 224         uint8_t dlength[3];
 225         uint8_t lun[8];
 226         __be32  itt;    /* Initiator Task Tag */
 227         __be32  ttt;    /* Target Transfer Tag */
 228         __be32  statsn;
 229         __be32  exp_cmdsn;
 230         __be32  max_cmdsn;
 231         uint8_t rsvd4[12];
 232 };
 233
 234 /* SCSI Task Management Message Header */
 235 struct iscsi_tm {
 236         uint8_t opcode;
 237         uint8_t flags;
 238         uint8_t rsvd1[2];
 239         uint8_t hlength;
 240         uint8_t dlength[3];
 241         uint8_t lun[8];
 242         __be32  itt;    /* Initiator Task Tag */
 243         __be32  rtt;    /* Reference Task Tag */
 244         __be32  cmdsn;
 245         __be32  exp_statsn;
 246         __be32  refcmdsn;
 247         __be32  exp_datasn;
 248         uint8_t rsvd2[8];
 249 };
 250
 251 #define ISCSI_FLAG_TM_FUNC_MASK                 0x7F
 252
 253 /* Function values */
 254 #define ISCSI_TM_FUNC_ABORT_TASK                1
 255 #define ISCSI_TM_FUNC_ABORT_TASK_SET            2
 256 #define ISCSI_TM_FUNC_CLEAR_ACA                 3
 257 #define ISCSI_TM_FUNC_CLEAR_TASK_SET            4
 258 #define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET        5
 259 #define ISCSI_TM_FUNC_TARGET_WARM_RESET         6
 260 #define ISCSI_TM_FUNC_TARGET_COLD_RESET         7
 261 #define ISCSI_TM_FUNC_TASK_REASSIGN             8
 262
 263 /* SCSI Task Management Response Header */
 264 struct iscsi_tm_rsp {
 265         uint8_t opcode;
 266         uint8_t flags;
 267         uint8_t response;       /* see Response values below */
 268         uint8_t qualifier;
 269         uint8_t hlength;
 270         uint8_t dlength[3];
 271         uint8_t rsvd2[8];
 272         __be32  itt;    /* Initiator Task Tag */
 273         __be32  rtt;    /* Reference Task Tag */
 274         __be32  statsn;
 275         __be32  exp_cmdsn;
 276         __be32  max_cmdsn;
 277         uint8_t rsvd3[12];
 278 };
 279
 280 /* Response values */
 281 #define ISCSI_TMF_RSP_COMPLETE          0x00
 282 #define ISCSI_TMF_RSP_NO_TASK           0x01
 283 #define ISCSI_TMF_RSP_NO_LUN            0x02
 284 #define ISCSI_TMF_RSP_TASK_ALLEGIANT    0x03
 285 #define ISCSI_TMF_RSP_NO_FAILOVER       0x04
 286 #define ISCSI_TMF_RSP_NOT_SUPPORTED     0x05
 287 #define ISCSI_TMF_RSP_AUTH_FAILED       0x06
 288 #define ISCSI_TMF_RSP_REJECTED          0xff
 289
 290 /* Ready To Transfer Header */
 291 struct iscsi_r2t_rsp {
 292         uint8_t opcode;
 293         uint8_t flags;
 294         uint8_t rsvd2[2];
 295         uint8_t hlength;
 296         uint8_t dlength[3];
 297         uint8_t lun[8];
 298         __be32  itt;    /* Initiator Task Tag */
 299         __be32  ttt;    /* Target Transfer Tag */
 300         __be32  statsn;
 301         __be32  exp_cmdsn;
 302         __be32  max_cmdsn;
 303         __be32  r2tsn;
 304         __be32  data_offset;
 305         __be32  data_length;
 306 };
 307
 308 /* SCSI Data Hdr */
 309 struct iscsi_data {
 310         uint8_t opcode;
 311         uint8_t flags;
 312         uint8_t rsvd2[2];
 313         uint8_t rsvd3;
 314         uint8_t dlength[3];
 315         uint8_t lun[8];
 316         __be32  itt;
 317         __be32  ttt;
 318         __be32  rsvd4;
 319         __be32  exp_statsn;
 320         __be32  rsvd5;
 321         __be32  datasn;
 322         __be32  offset;
 323         __be32  rsvd6;
 324         /* Payload */
 325 };
 326
 327 /* SCSI Data Response Hdr */
 328 struct iscsi_data_rsp {
 329         uint8_t opcode;
 330         uint8_t flags;
 331         uint8_t rsvd2;
 332         uint8_t cmd_status;
 333         uint8_t hlength;
 334         uint8_t dlength[3];
 335         uint8_t lun[8];
 336         __be32  itt;
 337         __be32  ttt;
 338         __be32  statsn;
 339         __be32  exp_cmdsn;
 340         __be32  max_cmdsn;
 341         __be32  datasn;
 342         __be32  offset;
 343         __be32  residual_count;
 344 };
 345
 346 /* Data Response PDU flags */
 347 #define ISCSI_FLAG_DATA_ACK             0x40
 348 #define ISCSI_FLAG_DATA_OVERFLOW        0x04
 349 #define ISCSI_FLAG_DATA_UNDERFLOW       0x02
 350 #define ISCSI_FLAG_DATA_STATUS          0x01
 351
 352 /* Text Header */
 353 struct iscsi_text {
 354         uint8_t opcode;
 355         uint8_t flags;
 356         uint8_t rsvd2[2];
 357         uint8_t hlength;
 358         uint8_t dlength[3];
 359         uint8_t rsvd4[8];
 360         __be32  itt;
 361         __be32  ttt;
 362         __be32  cmdsn;
 363         __be32  exp_statsn;
 364         uint8_t rsvd5[16];
 365         /* Text - key=value pairs */
 366 };
 367
 368 #define ISCSI_FLAG_TEXT_CONTINUE        0x40
 369
 370 /* Text Response Header */
 371 struct iscsi_text_rsp {
 372         uint8_t opcode;
 373         uint8_t flags;
 374         uint8_t rsvd2[2];
 375         uint8_t hlength;
 376         uint8_t dlength[3];
 377         uint8_t rsvd4[8];
 378         __be32  itt;
 379         __be32  ttt;
 380         __be32  statsn;
 381         __be32  exp_cmdsn;
 382         __be32  max_cmdsn;
 383         uint8_t rsvd5[12];
 384         /* Text Response - key:value pairs */
 385 };
 386
 387 /* Login Header */
 388 struct iscsi_login {
 389         uint8_t opcode;
 390         uint8_t flags;
 391         uint8_t max_version;    /* Max. version supported */
 392         uint8_t min_version;    /* Min. version supported */
 393         uint8_t hlength;
 394         uint8_t dlength[3];
 395         uint8_t isid[6];        /* Initiator Session ID */
 396         __be16  tsih;   /* Target Session Handle */
 397         __be32  itt;    /* Initiator Task Tag */
 398         __be16  cid;
 399         __be16  rsvd3;
 400         __be32  cmdsn;
 401         __be32  exp_statsn;
 402         uint8_t rsvd5[16];
 403 };
 404
 405 /* Login PDU flags */
 406 #define ISCSI_FLAG_LOGIN_TRANSIT                0x80
 407 #define ISCSI_FLAG_LOGIN_CONTINUE               0x40
 408 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK     0x0C    /* 2 bits */
 409 #define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK        0x03    /* 2 bits */
 410
 411 #define ISCSI_LOGIN_CURRENT_STAGE(flags) \
 412         ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
 413 #define ISCSI_LOGIN_NEXT_STAGE(flags) \
 414         (flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
 415
 416 /* Login Response Header */
 417 struct iscsi_login_rsp {
 418         uint8_t opcode;
 419         uint8_t flags;
 420         uint8_t max_version;    /* Max. version supported */
 421         uint8_t active_version; /* Active version */
 422         uint8_t hlength;
 423         uint8_t dlength[3];
 424         uint8_t isid[6];        /* Initiator Session ID */
 425         __be16  tsih;   /* Target Session Handle */
 426         __be32  itt;    /* Initiator Task Tag */
 427         __be32  rsvd3;
 428         __be32  statsn;
 429         __be32  exp_cmdsn;
 430         __be32  max_cmdsn;
 431         uint8_t status_class;   /* see Login RSP ststus classes below */
 432         uint8_t status_detail;  /* see Login RSP Status details below */
 433         uint8_t rsvd4[10];
 434 };
 435
 436 /* Login stage (phase) codes for CSG, NSG */
 437 #define ISCSI_INITIAL_LOGIN_STAGE               -1
 438 #define ISCSI_SECURITY_NEGOTIATION_STAGE        0
 439 #define ISCSI_OP_PARMS_NEGOTIATION_STAGE        1
 440 #define ISCSI_FULL_FEATURE_PHASE                3
 441
 442 /* Login Status response classes */
 443 #define ISCSI_STATUS_CLS_SUCCESS                0x00
 444 #define ISCSI_STATUS_CLS_REDIRECT               0x01
 445 #define ISCSI_STATUS_CLS_INITIATOR_ERR          0x02
 446 #define ISCSI_STATUS_CLS_TARGET_ERR             0x03
 447
 448 /* Login Status response detail codes */
 449 /* Class-0 (Success) */
 450 #define ISCSI_LOGIN_STATUS_ACCEPT               0x00
 451
 452 /* Class-1 (Redirection) */
 453 #define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP       0x01
 454 #define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM       0x02
 455
 456 /* Class-2 (Initiator Error) */
 457 #define ISCSI_LOGIN_STATUS_INIT_ERR             0x00
 458 #define ISCSI_LOGIN_STATUS_AUTH_FAILED          0x01
 459 #define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN        0x02
 460 #define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND        0x03
 461 #define ISCSI_LOGIN_STATUS_TGT_REMOVED          0x04
 462 #define ISCSI_LOGIN_STATUS_NO_VERSION           0x05
 463 #define ISCSI_LOGIN_STATUS_ISID_ERROR           0x06
 464 #define ISCSI_LOGIN_STATUS_MISSING_FIELDS       0x07
 465 #define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED      0x08
 466 #define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE      0x09
 467 #define ISCSI_LOGIN_STATUS_NO_SESSION           0x0a
 468 #define ISCSI_LOGIN_STATUS_INVALID_REQUEST      0x0b
 469
 470 /* Class-3 (Target Error) */
 471 #define ISCSI_LOGIN_STATUS_TARGET_ERROR         0x00
 472 #define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE      0x01
 473 #define ISCSI_LOGIN_STATUS_NO_RESOURCES         0x02
 474
 475 /* Logout Header */
 476 struct iscsi_logout {
 477         uint8_t opcode;
 478         uint8_t flags;
 479         uint8_t rsvd1[2];
 480         uint8_t hlength;
 481         uint8_t dlength[3];
 482         uint8_t rsvd2[8];
 483         __be32  itt;    /* Initiator Task Tag */
 484         __be16  cid;
 485         uint8_t rsvd3[2];
 486         __be32  cmdsn;
 487         __be32  exp_statsn;
 488         uint8_t rsvd4[16];
 489 };
 490
 491 /* Logout PDU flags */
 492 #define ISCSI_FLAG_LOGOUT_REASON_MASK   0x7F
 493
 494 /* logout reason_code values */
 495
 496 #define ISCSI_LOGOUT_REASON_CLOSE_SESSION       0
 497 #define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION    1
 498 #define ISCSI_LOGOUT_REASON_RECOVERY            2
 499 #define ISCSI_LOGOUT_REASON_AEN_REQUEST         3
 500
 501 /* Logout Response Header */
 502 struct iscsi_logout_rsp {
 503         uint8_t opcode;
 504         uint8_t flags;
 505         uint8_t response;       /* see Logout response values below */
 506         uint8_t rsvd2;
 507         uint8_t hlength;
 508         uint8_t dlength[3];
 509         uint8_t rsvd3[8];
 510         __be32  itt;    /* Initiator Task Tag */
 511         __be32  rsvd4;
 512         __be32  statsn;
 513         __be32  exp_cmdsn;
 514         __be32  max_cmdsn;
 515         __be32  rsvd5;
 516         __be16  t2wait;
 517         __be16  t2retain;
 518         __be32  rsvd6;
 519 };
 520
 521 /* logout response status values */
 522
 523 #define ISCSI_LOGOUT_SUCCESS                    0
 524 #define ISCSI_LOGOUT_CID_NOT_FOUND              1
 525 #define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED       2
 526 #define ISCSI_LOGOUT_CLEANUP_FAILED             3
 527
 528 /* SNACK Header */
 529 struct iscsi_snack {
 530         uint8_t opcode;
 531         uint8_t flags;
 532         uint8_t rsvd2[14];
 533         __be32  itt;
 534         __be32  begrun;
 535         __be32  runlength;
 536         __be32  exp_statsn;
 537         __be32  rsvd3;
 538         __be32  exp_datasn;
 539         uint8_t rsvd6[8];
 540 };
 541
 542 /* SNACK PDU flags */
 543 #define ISCSI_FLAG_SNACK_TYPE_MASK      0x0F    /* 4 bits */
 544
 545 /* Reject Message Header */
 546 struct iscsi_reject {
 547         uint8_t opcode;
 548         uint8_t flags;
 549         uint8_t reason;
 550         uint8_t rsvd2;
 551         uint8_t hlength;
 552         uint8_t dlength[3];
 553         uint8_t rsvd3[8];
 554         __be32  ffffffff;
 555         uint8_t rsvd4[4];
 556         __be32  statsn;
 557         __be32  exp_cmdsn;
 558         __be32  max_cmdsn;
 559         __be32  datasn;
 560         uint8_t rsvd5[8];
 561         /* Text - Rejected hdr */
 562 };
 563
 564 /* Reason for Reject */
 565 #define ISCSI_REASON_CMD_BEFORE_LOGIN   1
 566 #define ISCSI_REASON_DATA_DIGEST_ERROR  2
 567 #define ISCSI_REASON_DATA_SNACK_REJECT  3
 568 #define ISCSI_REASON_PROTOCOL_ERROR     4
 569 #define ISCSI_REASON_CMD_NOT_SUPPORTED  5
 570 #define ISCSI_REASON_IMM_CMD_REJECT             6
 571 #define ISCSI_REASON_TASK_IN_PROGRESS   7
 572 #define ISCSI_REASON_INVALID_SNACK              8
 573 #define ISCSI_REASON_BOOKMARK_INVALID   9
 574 #define ISCSI_REASON_BOOKMARK_NO_RESOURCES      10
 575 #define ISCSI_REASON_NEGOTIATION_RESET  11
 576
 577 /* Max. number of Key=Value pairs in a text message */
 578 #define MAX_KEY_VALUE_PAIRS     8192
 579
 580 /* maximum length for text keys/values */
 581 #define KEY_MAXLEN              64
 582 #define VALUE_MAXLEN            255
 583 #define TARGET_NAME_MAXLEN      VALUE_MAXLEN
 584
 585 #define DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH    8192
 586
 587 /************************* RFC 3720 End *****************************/
 588
 589 #endif /* ISCSI_PROTO_H */