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