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 #include <linux/types.h>
  25 #include <scsi/scsi.h>
  26
  27 #define ISCSI_DRAFT20_VERSION   0x00
  28
  29 /* default iSCSI listen port for incoming connections */
  30 #define ISCSI_LISTEN_PORT       3260
  31
  32 /* Padding word length */
  33 #define ISCSI_PAD_LEN           4
  34
  35 /*
  36  * useful common(control and data pathes) macro
  37  */
  38 #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
  39 #define hton24(p, v) { \
  40         p[0] = (((v) >> 16) & 0xFF); \
  41         p[1] = (((v) >> 8) & 0xFF); \
  42         p[2] = ((v) & 0xFF); \
  43 }
  44 #define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
  45
  46 /* initiator tags; opaque for target */
  47 typedef uint32_t __bitwise__ itt_t;
  48 /* below makes sense only for initiator that created this tag */
  49 #define build_itt(itt, age) ((__force itt_t)\
  50         ((itt) | ((age) << ISCSI_AGE_SHIFT)))
  51 #define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
  52 #define RESERVED_ITT ((__force itt_t)0xffffffff)
  53
  54 /*
  55  * iSCSI Template Message Header
  56  */
  57 struct iscsi_hdr {
  58         uint8_t         opcode;
  59         uint8_t         flags;          /* Final bit */
  60         uint8_t         rsvd2[2];
  61         uint8_t         hlength;        /* AHSs total length */
  62         uint8_t         dlength[3];     /* Data length */
  63         uint8_t         lun[8];
  64         itt_t           itt;            /* Initiator Task Tag, opaque for target */
  65         __be32          ttt;            /* Target Task Tag */
  66         __be32          statsn;
  67         __be32          exp_statsn;
  68         __be32          max_statsn;
  69         uint8_t         other[12];
  70 };
  71
  72 /************************* RFC 3720 Begin *****************************/
  73
  74 #define ISCSI_RESERVED_TAG              0xffffffff
  75
  76 /* Opcode encoding bits */
  77 #define ISCSI_OP_RETRY                  0x80
  78 #define ISCSI_OP_IMMEDIATE              0x40
  79 #define ISCSI_OPCODE_MASK               0x3F
  80
  81 /* Initiator Opcode values */
  82 #define ISCSI_OP_NOOP_OUT               0x00
  83 #define ISCSI_OP_SCSI_CMD               0x01
  84 #define ISCSI_OP_SCSI_TMFUNC            0x02
  85 #define ISCSI_OP_LOGIN                  0x03
  86 #define ISCSI_OP_TEXT                   0x04
  87 #define ISCSI_OP_SCSI_DATA_OUT          0x05
  88 #define ISCSI_OP_LOGOUT                 0x06
  89 #define ISCSI_OP_SNACK                  0x10
  90
  91 #define ISCSI_OP_VENDOR1_CMD            0x1c
  92 #define ISCSI_OP_VENDOR2_CMD            0x1d
  93 #define ISCSI_OP_VENDOR3_CMD            0x1e
  94 #define ISCSI_OP_VENDOR4_CMD            0x1f
  95
  96 /* Target Opcode values */
  97 #define ISCSI_OP_NOOP_IN                0x20
  98 #define ISCSI_OP_SCSI_CMD_RSP           0x21
  99 #define ISCSI_OP_SCSI_TMFUNC_RSP        0x22
 100 #define ISCSI_OP_LOGIN_RSP              0x23
 101 #define ISCSI_OP_TEXT_RSP               0x24
 102 #define ISCSI_OP_SCSI_DATA_IN           0x25
 103 #define ISCSI_OP_LOGOUT_RSP             0x26
 104 #define ISCSI_OP_R2T                    0x31
 105 #define ISCSI_OP_ASYNC_EVENT            0x32
 106 #define ISCSI_OP_REJECT                 0x3f
 107
 108 struct iscsi_ahs_hdr {
 109         __be16 ahslength;
 110         uint8_t ahstype;
 111         uint8_t ahspec[5];
 112 };
 113
 114 #define ISCSI_AHSTYPE_CDB               1
 115 #define ISCSI_AHSTYPE_RLENGTH           2
 116 #define ISCSI_CDB_SIZE                  16
 117
 118 /* iSCSI PDU Header */
 119 struct iscsi_cmd {
 120         uint8_t opcode;
 121         uint8_t flags;
 122         __be16 rsvd2;
 123         uint8_t hlength;
 124         uint8_t dlength[3];
 125         uint8_t lun[8];
 126         itt_t    itt;   /* Initiator Task Tag */
 127         __be32 data_length;
 128         __be32 cmdsn;
 129         __be32 exp_statsn;
 130         uint8_t cdb[ISCSI_CDB_SIZE];    /* SCSI Command Block */
 131         /* Additional Data (Command Dependent) */
 132 };
 133
 134 /* Command PDU flags */
 135 #define ISCSI_FLAG_CMD_FINAL            0x80
 136 #define ISCSI_FLAG_CMD_READ             0x40
 137 #define ISCSI_FLAG_CMD_WRITE            0x20
 138 #define ISCSI_FLAG_CMD_ATTR_MASK        0x07    /* 3 bits */
 139
 140 /* SCSI Command Attribute values */
 141 #define ISCSI_ATTR_UNTAGGED             0
 142 #define ISCSI_ATTR_SIMPLE               1
 143 #define ISCSI_ATTR_ORDERED              2
 144 #define ISCSI_ATTR_HEAD_OF_QUEUE        3
 145 #define ISCSI_ATTR_ACA                  4
 146
 147 struct iscsi_rlength_ahdr {
 148         __be16 ahslength;
 149         uint8_t ahstype;
 150         uint8_t reserved;
 151         __be32 read_length;
 152 };
 153
 154 /* Extended CDB AHS */
 155 struct iscsi_ecdb_ahdr {
 156         __be16 ahslength;       /* CDB length - 15, including reserved byte */
 157         uint8_t ahstype;
 158         uint8_t reserved;
 159         /* 4-byte aligned extended CDB spillover */
 160         uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE];
 161 };
 162
 163 /* SCSI Response Header */
 164 struct iscsi_cmd_rsp {
 165         uint8_t opcode;
 166         uint8_t flags;
 167         uint8_t response;
 168         uint8_t cmd_status;
 169         uint8_t hlength;
 170         uint8_t dlength[3];
 171         uint8_t rsvd[8];
 172         itt_t    itt;   /* Initiator Task Tag */
 173         __be32  rsvd1;
 174         __be32  statsn;
 175         __be32  exp_cmdsn;
 176         __be32  max_cmdsn;
 177         __be32  exp_datasn;
 178         __be32  bi_residual_count;
 179         __be32  residual_count;
 180         /* Response or Sense Data (optional) */
 181 };
 182
 183 /* Command Response PDU flags */
 184 #define ISCSI_FLAG_CMD_BIDI_OVERFLOW    0x10
 185 #define ISCSI_FLAG_CMD_BIDI_UNDERFLOW   0x08
 186 #define ISCSI_FLAG_CMD_OVERFLOW         0x04
 187 #define ISCSI_FLAG_CMD_UNDERFLOW        0x02
 188
 189 /* iSCSI Status values. Valid if Rsp Selector bit is not set */
 190 #define ISCSI_STATUS_CMD_COMPLETED      0
 191 #define ISCSI_STATUS_TARGET_FAILURE     1
 192 #define ISCSI_STATUS_SUBSYS_FAILURE     2
 193
 194 /* Asynchronous Event Header */
 195 struct iscsi_async {
 196         uint8_t opcode;
 197         uint8_t flags;
 198         uint8_t rsvd2[2];
 199         uint8_t rsvd3;
 200         uint8_t dlength[3];
 201         uint8_t lun[8];
 202         uint8_t rsvd4[8];
 203         __be32  statsn;
 204         __be32  exp_cmdsn;
 205         __be32  max_cmdsn;
 206         uint8_t async_event;
 207         uint8_t async_vcode;
 208         __be16  param1;
 209         __be16  param2;
 210         __be16  param3;
 211         uint8_t rsvd5[4];
 212 };
 213
 214 /* iSCSI Event Codes */
 215 #define ISCSI_ASYNC_MSG_SCSI_EVENT                      0
 216 #define ISCSI_ASYNC_MSG_REQUEST_LOGOUT                  1
 217 #define ISCSI_ASYNC_MSG_DROPPING_CONNECTION             2
 218 #define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS        3
 219 #define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION               4
 220 #define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC                 255
 221
 222 /* NOP-Out Message */
 223 struct iscsi_nopout {
 224         uint8_t opcode;
 225         uint8_t flags;
 226         __be16  rsvd2;
 227         uint8_t rsvd3;
 228         uint8_t dlength[3];
 229         uint8_t lun[8];
 230         itt_t    itt;   /* Initiator Task Tag */
 231         __be32  ttt;    /* Target Transfer Tag */
 232         __be32  cmdsn;
 233         __be32  exp_statsn;
 234         uint8_t rsvd4[16];
 235 };
 236
 237 /* NOP-In Message */
 238 struct iscsi_nopin {
 239         uint8_t opcode;
 240         uint8_t flags;
 241         __be16  rsvd2;
 242         uint8_t rsvd3;
 243         uint8_t dlength[3];
 244         uint8_t lun[8];
 245         itt_t    itt;   /* Initiator Task Tag */
 246         __be32  ttt;    /* Target Transfer Tag */
 247         __be32  statsn;
 248         __be32  exp_cmdsn;
 249         __be32  max_cmdsn;
 250         uint8_t rsvd4[12];
 251 };
 252
 253 /* SCSI Task Management Message Header */
 254 struct iscsi_tm {
 255         uint8_t opcode;
 256         uint8_t flags;
 257         uint8_t rsvd1[2];
 258         uint8_t hlength;
 259         uint8_t dlength[3];
 260         uint8_t lun[8];
 261         itt_t    itt;   /* Initiator Task Tag */
 262         itt_t    rtt;   /* Reference Task Tag */
 263         __be32  cmdsn;
 264         __be32  exp_statsn;
 265         __be32  refcmdsn;
 266         __be32  exp_datasn;
 267         uint8_t rsvd2[8];
 268 };
 269
 270 #define ISCSI_FLAG_TM_FUNC_MASK                 0x7F
 271
 272 /* Function values */
 273 #define ISCSI_TM_FUNC_ABORT_TASK                1
 274 #define ISCSI_TM_FUNC_ABORT_TASK_SET            2
 275 #define ISCSI_TM_FUNC_CLEAR_ACA                 3
 276 #define ISCSI_TM_FUNC_CLEAR_TASK_SET            4
 277 #define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET        5
 278 #define ISCSI_TM_FUNC_TARGET_WARM_RESET         6
 279 #define ISCSI_TM_FUNC_TARGET_COLD_RESET         7
 280 #define ISCSI_TM_FUNC_TASK_REASSIGN             8
 281
 282 /* SCSI Task Management Response Header */
 283 struct iscsi_tm_rsp {
 284         uint8_t opcode;
 285         uint8_t flags;
 286         uint8_t response;       /* see Response values below */
 287         uint8_t qualifier;
 288         uint8_t hlength;
 289         uint8_t dlength[3];
 290         uint8_t rsvd2[8];
 291         itt_t    itt;   /* Initiator Task Tag */
 292         itt_t    rtt;   /* Reference Task Tag */
 293         __be32  statsn;
 294         __be32  exp_cmdsn;
 295         __be32  max_cmdsn;
 296         uint8_t rsvd3[12];
 297 };
 298
 299 /* Response values */
 300 #define ISCSI_TMF_RSP_COMPLETE          0x00
 301 #define ISCSI_TMF_RSP_NO_TASK           0x01
 302 #define ISCSI_TMF_RSP_NO_LUN            0x02
 303 #define ISCSI_TMF_RSP_TASK_ALLEGIANT    0x03
 304 #define ISCSI_TMF_RSP_NO_FAILOVER       0x04
 305 #define ISCSI_TMF_RSP_NOT_SUPPORTED     0x05
 306 #define ISCSI_TMF_RSP_AUTH_FAILED       0x06
 307 #define ISCSI_TMF_RSP_REJECTED          0xff
 308
 309 /* Ready To Transfer Header */
 310 struct iscsi_r2t_rsp {
 311         uint8_t opcode;
 312         uint8_t flags;
 313         uint8_t rsvd2[2];
 314         uint8_t hlength;
 315         uint8_t dlength[3];
 316         uint8_t lun[8];
 317         itt_t    itt;   /* Initiator Task Tag */
 318         __be32  ttt;    /* Target Transfer Tag */
 319         __be32  statsn;
 320         __be32  exp_cmdsn;
 321         __be32  max_cmdsn;
 322         __be32  r2tsn;
 323         __be32  data_offset;
 324         __be32  data_length;
 325 };
 326
 327 /* SCSI Data Hdr */
 328 struct iscsi_data {
 329         uint8_t opcode;
 330         uint8_t flags;
 331         uint8_t rsvd2[2];
 332         uint8_t rsvd3;
 333         uint8_t dlength[3];
 334         uint8_t lun[8];
 335         itt_t    itt;
 336         __be32  ttt;
 337         __be32  rsvd4;
 338         __be32  exp_statsn;
 339         __be32  rsvd5;
 340         __be32  datasn;
 341         __be32  offset;
 342         __be32  rsvd6;
 343         /* Payload */
 344 };
 345
 346 /* SCSI Data Response Hdr */
 347 struct iscsi_data_rsp {
 348         uint8_t opcode;
 349         uint8_t flags;
 350         uint8_t rsvd2;
 351         uint8_t cmd_status;
 352         uint8_t hlength;
 353         uint8_t dlength[3];
 354         uint8_t lun[8];
 355         itt_t    itt;
 356         __be32  ttt;
 357         __be32  statsn;
 358         __be32  exp_cmdsn;
 359         __be32  max_cmdsn;
 360         __be32  datasn;
 361         __be32  offset;
 362         __be32  residual_count;
 363 };
 364
 365 /* Data Response PDU flags */
 366 #define ISCSI_FLAG_DATA_ACK             0x40
 367 #define ISCSI_FLAG_DATA_OVERFLOW        0x04
 368 #define ISCSI_FLAG_DATA_UNDERFLOW       0x02
 369 #define ISCSI_FLAG_DATA_STATUS          0x01
 370
 371 /* Text Header */
 372 struct iscsi_text {
 373         uint8_t opcode;
 374         uint8_t flags;
 375         uint8_t rsvd2[2];
 376         uint8_t hlength;
 377         uint8_t dlength[3];
 378         uint8_t rsvd4[8];
 379         itt_t    itt;
 380         __be32  ttt;
 381         __be32  cmdsn;
 382         __be32  exp_statsn;
 383         uint8_t rsvd5[16];
 384         /* Text - key=value pairs */
 385 };
 386
 387 #define ISCSI_FLAG_TEXT_CONTINUE        0x40
 388
 389 /* Text Response Header */
 390 struct iscsi_text_rsp {
 391         uint8_t opcode;
 392         uint8_t flags;
 393         uint8_t rsvd2[2];
 394         uint8_t hlength;
 395         uint8_t dlength[3];
 396         uint8_t rsvd4[8];
 397         itt_t    itt;
 398         __be32  ttt;
 399         __be32  statsn;
 400         __be32  exp_cmdsn;
 401         __be32  max_cmdsn;
 402         uint8_t rsvd5[12];
 403         /* Text Response - key:value pairs */
 404 };
 405
 406 /* Login Header */
 407 struct iscsi_login {
 408         uint8_t opcode;
 409         uint8_t flags;
 410         uint8_t max_version;    /* Max. version supported */
 411         uint8_t min_version;    /* Min. version supported */
 412         uint8_t hlength;
 413         uint8_t dlength[3];
 414         uint8_t isid[6];        /* Initiator Session ID */
 415         __be16  tsih;   /* Target Session Handle */
 416         itt_t    itt;   /* Initiator Task Tag */
 417         __be16  cid;
 418         __be16  rsvd3;
 419         __be32  cmdsn;
 420         __be32  exp_statsn;
 421         uint8_t rsvd5[16];
 422 };
 423
 424 /* Login PDU flags */
 425 #define ISCSI_FLAG_LOGIN_TRANSIT                0x80
 426 #define ISCSI_FLAG_LOGIN_CONTINUE               0x40
 427 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK     0x0C    /* 2 bits */
 428 #define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK        0x03    /* 2 bits */
 429
 430 #define ISCSI_LOGIN_CURRENT_STAGE(flags) \
 431         ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
 432 #define ISCSI_LOGIN_NEXT_STAGE(flags) \
 433         (flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
 434
 435 /* Login Response Header */
 436 struct iscsi_login_rsp {
 437         uint8_t opcode;
 438         uint8_t flags;
 439         uint8_t max_version;    /* Max. version supported */
 440         uint8_t active_version; /* Active version */
 441         uint8_t hlength;
 442         uint8_t dlength[3];
 443         uint8_t isid[6];        /* Initiator Session ID */
 444         __be16  tsih;   /* Target Session Handle */
 445         itt_t    itt;   /* Initiator Task Tag */
 446         __be32  rsvd3;
 447         __be32  statsn;
 448         __be32  exp_cmdsn;
 449         __be32  max_cmdsn;
 450         uint8_t status_class;   /* see Login RSP ststus classes below */
 451         uint8_t status_detail;  /* see Login RSP Status details below */
 452         uint8_t rsvd4[10];
 453 };
 454
 455 /* Login stage (phase) codes for CSG, NSG */
 456 #define ISCSI_INITIAL_LOGIN_STAGE               -1
 457 #define ISCSI_SECURITY_NEGOTIATION_STAGE        0
 458 #define ISCSI_OP_PARMS_NEGOTIATION_STAGE        1
 459 #define ISCSI_FULL_FEATURE_PHASE                3
 460
 461 /* Login Status response classes */
 462 #define ISCSI_STATUS_CLS_SUCCESS                0x00
 463 #define ISCSI_STATUS_CLS_REDIRECT               0x01
 464 #define ISCSI_STATUS_CLS_INITIATOR_ERR          0x02
 465 #define ISCSI_STATUS_CLS_TARGET_ERR             0x03
 466
 467 /* Login Status response detail codes */
 468 /* Class-0 (Success) */
 469 #define ISCSI_LOGIN_STATUS_ACCEPT               0x00
 470
 471 /* Class-1 (Redirection) */
 472 #define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP       0x01
 473 #define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM       0x02
 474
 475 /* Class-2 (Initiator Error) */
 476 #define ISCSI_LOGIN_STATUS_INIT_ERR             0x00
 477 #define ISCSI_LOGIN_STATUS_AUTH_FAILED          0x01
 478 #define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN        0x02
 479 #define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND        0x03
 480 #define ISCSI_LOGIN_STATUS_TGT_REMOVED          0x04
 481 #define ISCSI_LOGIN_STATUS_NO_VERSION           0x05
 482 #define ISCSI_LOGIN_STATUS_ISID_ERROR           0x06
 483 #define ISCSI_LOGIN_STATUS_MISSING_FIELDS       0x07
 484 #define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED      0x08
 485 #define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE      0x09
 486 #define ISCSI_LOGIN_STATUS_NO_SESSION           0x0a
 487 #define ISCSI_LOGIN_STATUS_INVALID_REQUEST      0x0b
 488
 489 /* Class-3 (Target Error) */
 490 #define ISCSI_LOGIN_STATUS_TARGET_ERROR         0x00
 491 #define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE      0x01
 492 #define ISCSI_LOGIN_STATUS_NO_RESOURCES         0x02
 493
 494 /* Logout Header */
 495 struct iscsi_logout {
 496         uint8_t opcode;
 497         uint8_t flags;
 498         uint8_t rsvd1[2];
 499         uint8_t hlength;
 500         uint8_t dlength[3];
 501         uint8_t rsvd2[8];
 502         itt_t    itt;   /* Initiator Task Tag */
 503         __be16  cid;
 504         uint8_t rsvd3[2];
 505         __be32  cmdsn;
 506         __be32  exp_statsn;
 507         uint8_t rsvd4[16];
 508 };
 509
 510 /* Logout PDU flags */
 511 #define ISCSI_FLAG_LOGOUT_REASON_MASK   0x7F
 512
 513 /* logout reason_code values */
 514
 515 #define ISCSI_LOGOUT_REASON_CLOSE_SESSION       0
 516 #define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION    1
 517 #define ISCSI_LOGOUT_REASON_RECOVERY            2
 518 #define ISCSI_LOGOUT_REASON_AEN_REQUEST         3
 519
 520 /* Logout Response Header */
 521 struct iscsi_logout_rsp {
 522         uint8_t opcode;
 523         uint8_t flags;
 524         uint8_t response;       /* see Logout response values below */
 525         uint8_t rsvd2;
 526         uint8_t hlength;
 527         uint8_t dlength[3];
 528         uint8_t rsvd3[8];
 529         itt_t    itt;   /* Initiator Task Tag */
 530         __be32  rsvd4;
 531         __be32  statsn;
 532         __be32  exp_cmdsn;
 533         __be32  max_cmdsn;
 534         __be32  rsvd5;
 535         __be16  t2wait;
 536         __be16  t2retain;
 537         __be32  rsvd6;
 538 };
 539
 540 /* logout response status values */
 541
 542 #define ISCSI_LOGOUT_SUCCESS                    0
 543 #define ISCSI_LOGOUT_CID_NOT_FOUND              1
 544 #define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED       2
 545 #define ISCSI_LOGOUT_CLEANUP_FAILED             3
 546
 547 /* SNACK Header */
 548 struct iscsi_snack {
 549         uint8_t opcode;
 550         uint8_t flags;
 551         uint8_t rsvd2[14];
 552         itt_t    itt;
 553         __be32  begrun;
 554         __be32  runlength;
 555         __be32  exp_statsn;
 556         __be32  rsvd3;
 557         __be32  exp_datasn;
 558         uint8_t rsvd6[8];
 559 };
 560
 561 /* SNACK PDU flags */
 562 #define ISCSI_FLAG_SNACK_TYPE_MASK      0x0F    /* 4 bits */
 563
 564 /* Reject Message Header */
 565 struct iscsi_reject {
 566         uint8_t opcode;
 567         uint8_t flags;
 568         uint8_t reason;
 569         uint8_t rsvd2;
 570         uint8_t hlength;
 571         uint8_t dlength[3];
 572         uint8_t rsvd3[8];
 573         __be32  ffffffff;
 574         uint8_t rsvd4[4];
 575         __be32  statsn;
 576         __be32  exp_cmdsn;
 577         __be32  max_cmdsn;
 578         __be32  datasn;
 579         uint8_t rsvd5[8];
 580         /* Text - Rejected hdr */
 581 };
 582
 583 /* Reason for Reject */
 584 #define ISCSI_REASON_CMD_BEFORE_LOGIN   1
 585 #define ISCSI_REASON_DATA_DIGEST_ERROR  2
 586 #define ISCSI_REASON_DATA_SNACK_REJECT  3
 587 #define ISCSI_REASON_PROTOCOL_ERROR     4
 588 #define ISCSI_REASON_CMD_NOT_SUPPORTED  5
 589 #define ISCSI_REASON_IMM_CMD_REJECT             6
 590 #define ISCSI_REASON_TASK_IN_PROGRESS   7
 591 #define ISCSI_REASON_INVALID_SNACK              8
 592 #define ISCSI_REASON_BOOKMARK_INVALID   9
 593 #define ISCSI_REASON_BOOKMARK_NO_RESOURCES      10
 594 #define ISCSI_REASON_NEGOTIATION_RESET  11
 595
 596 /* Max. number of Key=Value pairs in a text message */
 597 #define MAX_KEY_VALUE_PAIRS     8192
 598
 599 /* maximum length for text keys/values */
 600 #define KEY_MAXLEN              64
 601 #define VALUE_MAXLEN            255
 602 #define TARGET_NAME_MAXLEN      VALUE_MAXLEN
 603
 604 #define ISCSI_DEF_MAX_RECV_SEG_LEN              8192
 605 #define ISCSI_MIN_MAX_RECV_SEG_LEN              512
 606 #define ISCSI_MAX_MAX_RECV_SEG_LEN              16777215
 607
 608 #define ISCSI_DEF_FIRST_BURST_LEN               65536
 609 #define ISCSI_MIN_FIRST_BURST_LEN               512
 610 #define ISCSI_MAX_FIRST_BURST_LEN               16777215
 611
 612 #define ISCSI_DEF_MAX_BURST_LEN                 262144
 613 #define ISCSI_MIN_MAX_BURST_LEN                 512
 614 #define ISCSI_MAX_MAX_BURST_LEN                 16777215
 615
 616 #define ISCSI_DEF_TIME2WAIT                     2
 617
 618 /************************* RFC 3720 End *****************************/
 619
 620 #endif /* ISCSI_PROTO_H */