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