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 /* iSCSI header length */
  33 #define ISCSI_HDR_LEN           48
  34
  35 /* iSCSI CRC32C length */
  36 #define ISCSI_CRC_LEN           4
  37
  38 /* Padding word length */
  39 #define ISCSI_PAD_LEN           4
  40
  41 /*
  42  * Serial Number Arithmetic, 32 bits, RFC1982
  43  */
  44
  45 static inline int iscsi_sna_lt(u32 n1, u32 n2)
  46 {
  47         return (s32)(n1 - n2) < 0;
  48 }
  49
  50 static inline int iscsi_sna_lte(u32 n1, u32 n2)
  51 {
  52         return (s32)(n1 - n2) <= 0;
  53 }
  54
  55 static inline int iscsi_sna_gt(u32 n1, u32 n2)
  56 {
  57         return (s32)(n1 - n2) > 0;
  58 }
  59
  60 static inline int iscsi_sna_gte(u32 n1, u32 n2)
  61 {
  62         return (s32)(n1 - n2) >= 0;
  63 }
  64
  65 /*
  66  * useful common(control and data pathes) macro
  67  */
  68 #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
  69 #define hton24(p, v) { \
  70         p[0] = (((v) >> 16) & 0xFF); \
  71         p[1] = (((v) >> 8) & 0xFF); \
  72         p[2] = ((v) & 0xFF); \
  73 }
  74 #define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
  75
  76 /* initiator tags; opaque for target */
  77 typedef uint32_t __bitwise__ itt_t;
  78 /* below makes sense only for initiator that created this tag */
  79 #define build_itt(itt, age) ((__force itt_t)\
  80         ((itt) | ((age) << ISCSI_AGE_SHIFT)))
  81 #define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
  82 #define RESERVED_ITT ((__force itt_t)0xffffffff)
  83
  84 /*
  85  * iSCSI Template Message Header
  86  */
  87 struct iscsi_hdr {
  88         uint8_t         opcode;
  89         uint8_t         flags;          /* Final bit */
  90         uint8_t         rsvd2[2];
  91         uint8_t         hlength;        /* AHSs total length */
  92         uint8_t         dlength[3];     /* Data length */
  93         struct scsi_lun lun;
  94         itt_t           itt;            /* Initiator Task Tag, opaque for target */
  95         __be32          ttt;            /* Target Task Tag */
  96         __be32          statsn;
  97         __be32          exp_statsn;
  98         __be32          max_statsn;
  99         uint8_t         other[12];
 100 };
 101
 102 /************************* RFC 3720 Begin *****************************/
 103
 104 #define ISCSI_RESERVED_TAG              0xffffffff
 105
 106 /* Opcode encoding bits */
 107 #define ISCSI_OP_RETRY                  0x80
 108 #define ISCSI_OP_IMMEDIATE              0x40
 109 #define ISCSI_OPCODE_MASK               0x3F
 110
 111 /* Initiator Opcode values */
 112 #define ISCSI_OP_NOOP_OUT               0x00
 113 #define ISCSI_OP_SCSI_CMD               0x01
 114 #define ISCSI_OP_SCSI_TMFUNC            0x02
 115 #define ISCSI_OP_LOGIN                  0x03
 116 #define ISCSI_OP_TEXT                   0x04
 117 #define ISCSI_OP_SCSI_DATA_OUT          0x05
 118 #define ISCSI_OP_LOGOUT                 0x06
 119 #define ISCSI_OP_SNACK                  0x10
 120
 121 #define ISCSI_OP_VENDOR1_CMD            0x1c
 122 #define ISCSI_OP_VENDOR2_CMD            0x1d
 123 #define ISCSI_OP_VENDOR3_CMD            0x1e
 124 #define ISCSI_OP_VENDOR4_CMD            0x1f
 125
 126 /* Target Opcode values */
 127 #define ISCSI_OP_NOOP_IN                0x20
 128 #define ISCSI_OP_SCSI_CMD_RSP           0x21
 129 #define ISCSI_OP_SCSI_TMFUNC_RSP        0x22
 130 #define ISCSI_OP_LOGIN_RSP              0x23
 131 #define ISCSI_OP_TEXT_RSP               0x24
 132 #define ISCSI_OP_SCSI_DATA_IN           0x25
 133 #define ISCSI_OP_LOGOUT_RSP             0x26
 134 #define ISCSI_OP_R2T                    0x31
 135 #define ISCSI_OP_ASYNC_EVENT            0x32
 136 #define ISCSI_OP_REJECT                 0x3f
 137
 138 struct iscsi_ahs_hdr {
 139         __be16 ahslength;
 140         uint8_t ahstype;
 141         uint8_t ahspec[5];
 142 };
 143
 144 #define ISCSI_AHSTYPE_CDB               1
 145 #define ISCSI_AHSTYPE_RLENGTH           2
 146 #define ISCSI_CDB_SIZE                  16
 147
 148 /* iSCSI PDU Header */
 149 struct iscsi_scsi_req {
 150         uint8_t opcode;
 151         uint8_t flags;
 152         __be16 rsvd2;
 153         uint8_t hlength;
 154         uint8_t dlength[3];
 155         struct scsi_lun lun;
 156         itt_t    itt;   /* Initiator Task Tag */
 157         __be32 data_length;
 158         __be32 cmdsn;
 159         __be32 exp_statsn;
 160         uint8_t cdb[ISCSI_CDB_SIZE];    /* SCSI Command Block */
 161         /* Additional Data (Command Dependent) */
 162 };
 163
 164 /* Command PDU flags */
 165 #define ISCSI_FLAG_CMD_FINAL            0x80
 166 #define ISCSI_FLAG_CMD_READ             0x40
 167 #define ISCSI_FLAG_CMD_WRITE            0x20
 168 #define ISCSI_FLAG_CMD_ATTR_MASK        0x07    /* 3 bits */
 169
 170 /* SCSI Command Attribute values */
 171 #define ISCSI_ATTR_UNTAGGED             0
 172 #define ISCSI_ATTR_SIMPLE               1
 173 #define ISCSI_ATTR_ORDERED              2
 174 #define ISCSI_ATTR_HEAD_OF_QUEUE        3
 175 #define ISCSI_ATTR_ACA                  4
 176
 177 struct iscsi_rlength_ahdr {
 178         __be16 ahslength;
 179         uint8_t ahstype;
 180         uint8_t reserved;
 181         __be32 read_length;
 182 };
 183
 184 /* Extended CDB AHS */
 185 struct iscsi_ecdb_ahdr {
 186         __be16 ahslength;       /* CDB length - 15, including reserved byte */
 187         uint8_t ahstype;
 188         uint8_t reserved;
 189         /* 4-byte aligned extended CDB spillover */
 190         uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE];
 191 };
 192
 193 /* SCSI Response Header */
 194 struct iscsi_scsi_rsp {
 195         uint8_t opcode;
 196         uint8_t flags;
 197         uint8_t response;
 198         uint8_t cmd_status;
 199         uint8_t hlength;
 200         uint8_t dlength[3];
 201         uint8_t rsvd[8];
 202         itt_t    itt;   /* Initiator Task Tag */
 203         __be32  rsvd1;
 204         __be32  statsn;
 205         __be32  exp_cmdsn;
 206         __be32  max_cmdsn;
 207         __be32  exp_datasn;
 208         __be32  bi_residual_count;
 209         __be32  residual_count;
 210         /* Response or Sense Data (optional) */
 211 };
 212
 213 /* Command Response PDU flags */
 214 #define ISCSI_FLAG_CMD_BIDI_OVERFLOW    0x10
 215 #define ISCSI_FLAG_CMD_BIDI_UNDERFLOW   0x08
 216 #define ISCSI_FLAG_CMD_OVERFLOW         0x04
 217 #define ISCSI_FLAG_CMD_UNDERFLOW        0x02
 218
 219 /* iSCSI Status values. Valid if Rsp Selector bit is not set */
 220 #define ISCSI_STATUS_CMD_COMPLETED      0
 221 #define ISCSI_STATUS_TARGET_FAILURE     1
 222 #define ISCSI_STATUS_SUBSYS_FAILURE     2
 223
 224 /* Asynchronous Event Header */
 225 struct iscsi_async {
 226         uint8_t opcode;
 227         uint8_t flags;
 228         uint8_t rsvd2[2];
 229         uint8_t rsvd3;
 230         uint8_t dlength[3];
 231         struct scsi_lun lun;
 232         uint8_t rsvd4[8];
 233         __be32  statsn;
 234         __be32  exp_cmdsn;
 235         __be32  max_cmdsn;
 236         uint8_t async_event;
 237         uint8_t async_vcode;
 238         __be16  param1;
 239         __be16  param2;
 240         __be16  param3;
 241         uint8_t rsvd5[4];
 242 };
 243
 244 /* iSCSI Event Codes */
 245 #define ISCSI_ASYNC_MSG_SCSI_EVENT                      0
 246 #define ISCSI_ASYNC_MSG_REQUEST_LOGOUT                  1
 247 #define ISCSI_ASYNC_MSG_DROPPING_CONNECTION             2
 248 #define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS        3
 249 #define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION               4
 250 #define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC                 255
 251
 252 /* NOP-Out Message */
 253 struct iscsi_nopout {
 254         uint8_t opcode;
 255         uint8_t flags;
 256         __be16  rsvd2;
 257         uint8_t rsvd3;
 258         uint8_t dlength[3];
 259         struct scsi_lun lun;
 260         itt_t    itt;   /* Initiator Task Tag */
 261         __be32  ttt;    /* Target Transfer Tag */
 262         __be32  cmdsn;
 263         __be32  exp_statsn;
 264         uint8_t rsvd4[16];
 265 };
 266
 267 /* NOP-In Message */
 268 struct iscsi_nopin {
 269         uint8_t opcode;
 270         uint8_t flags;
 271         __be16  rsvd2;
 272         uint8_t rsvd3;
 273         uint8_t dlength[3];
 274         struct scsi_lun lun;
 275         itt_t    itt;   /* Initiator Task Tag */
 276         __be32  ttt;    /* Target Transfer Tag */
 277         __be32  statsn;
 278         __be32  exp_cmdsn;
 279         __be32  max_cmdsn;
 280         uint8_t rsvd4[12];
 281 };
 282
 283 /* SCSI Task Management Message Header */
 284 struct iscsi_tm {
 285         uint8_t opcode;
 286         uint8_t flags;
 287         uint8_t rsvd1[2];
 288         uint8_t hlength;
 289         uint8_t dlength[3];
 290         struct scsi_lun lun;
 291         itt_t    itt;   /* Initiator Task Tag */
 292         itt_t    rtt;   /* Reference Task Tag */
 293         __be32  cmdsn;
 294         __be32  exp_statsn;
 295         __be32  refcmdsn;
 296         __be32  exp_datasn;
 297         uint8_t rsvd2[8];
 298 };
 299
 300 #define ISCSI_FLAG_TM_FUNC_MASK                 0x7F
 301
 302 /* Function values */
 303 #define ISCSI_TM_FUNC_ABORT_TASK                1
 304 #define ISCSI_TM_FUNC_ABORT_TASK_SET            2
 305 #define ISCSI_TM_FUNC_CLEAR_ACA                 3
 306 #define ISCSI_TM_FUNC_CLEAR_TASK_SET            4
 307 #define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET        5
 308 #define ISCSI_TM_FUNC_TARGET_WARM_RESET         6
 309 #define ISCSI_TM_FUNC_TARGET_COLD_RESET         7
 310 #define ISCSI_TM_FUNC_TASK_REASSIGN             8
 311
 312 #define ISCSI_TM_FUNC_VALUE(hdr) ((hdr)->flags & ISCSI_FLAG_TM_FUNC_MASK)
 313
 314 /* SCSI Task Management Response Header */
 315 struct iscsi_tm_rsp {
 316         uint8_t opcode;
 317         uint8_t flags;
 318         uint8_t response;       /* see Response values below */
 319         uint8_t qualifier;
 320         uint8_t hlength;
 321         uint8_t dlength[3];
 322         uint8_t rsvd2[8];
 323         itt_t    itt;   /* Initiator Task Tag */
 324         itt_t    rtt;   /* Reference Task Tag */
 325         __be32  statsn;
 326         __be32  exp_cmdsn;
 327         __be32  max_cmdsn;
 328         uint8_t rsvd3[12];
 329 };
 330
 331 /* Response values */
 332 #define ISCSI_TMF_RSP_COMPLETE          0x00
 333 #define ISCSI_TMF_RSP_NO_TASK           0x01
 334 #define ISCSI_TMF_RSP_NO_LUN            0x02
 335 #define ISCSI_TMF_RSP_TASK_ALLEGIANT    0x03
 336 #define ISCSI_TMF_RSP_NO_FAILOVER       0x04
 337 #define ISCSI_TMF_RSP_NOT_SUPPORTED     0x05
 338 #define ISCSI_TMF_RSP_AUTH_FAILED       0x06
 339 #define ISCSI_TMF_RSP_REJECTED          0xff
 340
 341 /* Ready To Transfer Header */
 342 struct iscsi_r2t_rsp {
 343         uint8_t opcode;
 344         uint8_t flags;
 345         uint8_t rsvd2[2];
 346         uint8_t hlength;
 347         uint8_t dlength[3];
 348         struct scsi_lun lun;
 349         itt_t    itt;   /* Initiator Task Tag */
 350         __be32  ttt;    /* Target Transfer Tag */
 351         __be32  statsn;
 352         __be32  exp_cmdsn;
 353         __be32  max_cmdsn;
 354         __be32  r2tsn;
 355         __be32  data_offset;
 356         __be32  data_length;
 357 };
 358
 359 /* SCSI Data Hdr */
 360 struct iscsi_data {
 361         uint8_t opcode;
 362         uint8_t flags;
 363         uint8_t rsvd2[2];
 364         uint8_t rsvd3;
 365         uint8_t dlength[3];
 366         struct scsi_lun lun;
 367         itt_t    itt;
 368         __be32  ttt;
 369         __be32  rsvd4;
 370         __be32  exp_statsn;
 371         __be32  rsvd5;
 372         __be32  datasn;
 373         __be32  offset;
 374         __be32  rsvd6;
 375         /* Payload */
 376 };
 377
 378 /* SCSI Data Response Hdr */
 379 struct iscsi_data_rsp {
 380         uint8_t opcode;
 381         uint8_t flags;
 382         uint8_t rsvd2;
 383         uint8_t cmd_status;
 384         uint8_t hlength;
 385         uint8_t dlength[3];
 386         struct scsi_lun lun;
 387         itt_t    itt;
 388         __be32  ttt;
 389         __be32  statsn;
 390         __be32  exp_cmdsn;
 391         __be32  max_cmdsn;
 392         __be32  datasn;
 393         __be32  offset;
 394         __be32  residual_count;
 395 };
 396
 397 /* Data Response PDU flags */
 398 #define ISCSI_FLAG_DATA_ACK             0x40
 399 #define ISCSI_FLAG_DATA_OVERFLOW        0x04
 400 #define ISCSI_FLAG_DATA_UNDERFLOW       0x02
 401 #define ISCSI_FLAG_DATA_STATUS          0x01
 402
 403 /* Text Header */
 404 struct iscsi_text {
 405         uint8_t opcode;
 406         uint8_t flags;
 407         uint8_t rsvd2[2];
 408         uint8_t hlength;
 409         uint8_t dlength[3];
 410         uint8_t rsvd4[8];
 411         itt_t    itt;
 412         __be32  ttt;
 413         __be32  cmdsn;
 414         __be32  exp_statsn;
 415         uint8_t rsvd5[16];
 416         /* Text - key=value pairs */
 417 };
 418
 419 #define ISCSI_FLAG_TEXT_CONTINUE        0x40
 420
 421 /* Text Response Header */
 422 struct iscsi_text_rsp {
 423         uint8_t opcode;
 424         uint8_t flags;
 425         uint8_t rsvd2[2];
 426         uint8_t hlength;
 427         uint8_t dlength[3];
 428         uint8_t rsvd4[8];
 429         itt_t    itt;
 430         __be32  ttt;
 431         __be32  statsn;
 432         __be32  exp_cmdsn;
 433         __be32  max_cmdsn;
 434         uint8_t rsvd5[12];
 435         /* Text Response - key:value pairs */
 436 };
 437
 438 /* Login Header */
 439 struct iscsi_login_req {
 440         uint8_t opcode;
 441         uint8_t flags;
 442         uint8_t max_version;    /* Max. version supported */
 443         uint8_t min_version;    /* Min. version supported */
 444         uint8_t hlength;
 445         uint8_t dlength[3];
 446         uint8_t isid[6];        /* Initiator Session ID */
 447         __be16  tsih;   /* Target Session Handle */
 448         itt_t    itt;   /* Initiator Task Tag */
 449         __be16  cid;
 450         __be16  rsvd3;
 451         __be32  cmdsn;
 452         __be32  exp_statsn;
 453         uint8_t rsvd5[16];
 454 };
 455
 456 /* Login PDU flags */
 457 #define ISCSI_FLAG_LOGIN_TRANSIT                0x80
 458 #define ISCSI_FLAG_LOGIN_CONTINUE               0x40
 459 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK     0x0C    /* 2 bits */
 460 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE1         0x04
 461 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE2         0x08
 462 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE3         0x0C
 463 #define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK        0x03    /* 2 bits */
 464 #define ISCSI_FLAG_LOGIN_NEXT_STAGE1            0x01
 465 #define ISCSI_FLAG_LOGIN_NEXT_STAGE2            0x02
 466 #define ISCSI_FLAG_LOGIN_NEXT_STAGE3            0x03
 467
 468 #define ISCSI_LOGIN_CURRENT_STAGE(flags) \
 469         ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
 470 #define ISCSI_LOGIN_NEXT_STAGE(flags) \
 471         (flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
 472
 473 /* Login Response Header */
 474 struct iscsi_login_rsp {
 475         uint8_t opcode;
 476         uint8_t flags;
 477         uint8_t max_version;    /* Max. version supported */
 478         uint8_t active_version; /* Active version */
 479         uint8_t hlength;
 480         uint8_t dlength[3];
 481         uint8_t isid[6];        /* Initiator Session ID */
 482         __be16  tsih;   /* Target Session Handle */
 483         itt_t    itt;   /* Initiator Task Tag */
 484         __be32  rsvd3;
 485         __be32  statsn;
 486         __be32  exp_cmdsn;
 487         __be32  max_cmdsn;
 488         uint8_t status_class;   /* see Login RSP ststus classes below */
 489         uint8_t status_detail;  /* see Login RSP Status details below */
 490         uint8_t rsvd4[10];
 491 };
 492
 493 /* Login stage (phase) codes for CSG, NSG */
 494 #define ISCSI_INITIAL_LOGIN_STAGE               -1
 495 #define ISCSI_SECURITY_NEGOTIATION_STAGE        0
 496 #define ISCSI_OP_PARMS_NEGOTIATION_STAGE        1
 497 #define ISCSI_FULL_FEATURE_PHASE                3
 498
 499 /* Login Status response classes */
 500 #define ISCSI_STATUS_CLS_SUCCESS                0x00
 501 #define ISCSI_STATUS_CLS_REDIRECT               0x01
 502 #define ISCSI_STATUS_CLS_INITIATOR_ERR          0x02
 503 #define ISCSI_STATUS_CLS_TARGET_ERR             0x03
 504
 505 /* Login Status response detail codes */
 506 /* Class-0 (Success) */
 507 #define ISCSI_LOGIN_STATUS_ACCEPT               0x00
 508
 509 /* Class-1 (Redirection) */
 510 #define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP       0x01
 511 #define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM       0x02
 512
 513 /* Class-2 (Initiator Error) */
 514 #define ISCSI_LOGIN_STATUS_INIT_ERR             0x00
 515 #define ISCSI_LOGIN_STATUS_AUTH_FAILED          0x01
 516 #define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN        0x02
 517 #define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND        0x03
 518 #define ISCSI_LOGIN_STATUS_TGT_REMOVED          0x04
 519 #define ISCSI_LOGIN_STATUS_NO_VERSION           0x05
 520 #define ISCSI_LOGIN_STATUS_ISID_ERROR           0x06
 521 #define ISCSI_LOGIN_STATUS_MISSING_FIELDS       0x07
 522 #define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED      0x08
 523 #define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE      0x09
 524 #define ISCSI_LOGIN_STATUS_NO_SESSION           0x0a
 525 #define ISCSI_LOGIN_STATUS_INVALID_REQUEST      0x0b
 526
 527 /* Class-3 (Target Error) */
 528 #define ISCSI_LOGIN_STATUS_TARGET_ERROR         0x00
 529 #define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE      0x01
 530 #define ISCSI_LOGIN_STATUS_NO_RESOURCES         0x02
 531
 532 /* Logout Header */
 533 struct iscsi_logout {
 534         uint8_t opcode;
 535         uint8_t flags;
 536         uint8_t rsvd1[2];
 537         uint8_t hlength;
 538         uint8_t dlength[3];
 539         uint8_t rsvd2[8];
 540         itt_t    itt;   /* Initiator Task Tag */
 541         __be16  cid;
 542         uint8_t rsvd3[2];
 543         __be32  cmdsn;
 544         __be32  exp_statsn;
 545         uint8_t rsvd4[16];
 546 };
 547
 548 /* Logout PDU flags */
 549 #define ISCSI_FLAG_LOGOUT_REASON_MASK   0x7F
 550
 551 /* logout reason_code values */
 552
 553 #define ISCSI_LOGOUT_REASON_CLOSE_SESSION       0
 554 #define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION    1
 555 #define ISCSI_LOGOUT_REASON_RECOVERY            2
 556 #define ISCSI_LOGOUT_REASON_AEN_REQUEST         3
 557
 558 /* Logout Response Header */
 559 struct iscsi_logout_rsp {
 560         uint8_t opcode;
 561         uint8_t flags;
 562         uint8_t response;       /* see Logout response values below */
 563         uint8_t rsvd2;
 564         uint8_t hlength;
 565         uint8_t dlength[3];
 566         uint8_t rsvd3[8];
 567         itt_t    itt;   /* Initiator Task Tag */
 568         __be32  rsvd4;
 569         __be32  statsn;
 570         __be32  exp_cmdsn;
 571         __be32  max_cmdsn;
 572         __be32  rsvd5;
 573         __be16  t2wait;
 574         __be16  t2retain;
 575         __be32  rsvd6;
 576 };
 577
 578 /* logout response status values */
 579
 580 #define ISCSI_LOGOUT_SUCCESS                    0
 581 #define ISCSI_LOGOUT_CID_NOT_FOUND              1
 582 #define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED       2
 583 #define ISCSI_LOGOUT_CLEANUP_FAILED             3
 584
 585 /* SNACK Header */
 586 struct iscsi_snack {
 587         uint8_t opcode;
 588         uint8_t flags;
 589         uint8_t rsvd2[2];
 590         uint8_t hlength;
 591         uint8_t dlength[3];
 592         uint8_t lun[8];
 593         itt_t    itt;
 594         __be32  ttt;
 595         uint8_t rsvd3[4];
 596         __be32  exp_statsn;
 597         uint8_t rsvd4[8];
 598         __be32  begrun;
 599         __be32  runlength;
 600 };
 601
 602 /* SNACK PDU flags */
 603 #define ISCSI_FLAG_SNACK_TYPE_DATA              0
 604 #define ISCSI_FLAG_SNACK_TYPE_R2T               0
 605 #define ISCSI_FLAG_SNACK_TYPE_STATUS            1
 606 #define ISCSI_FLAG_SNACK_TYPE_DATA_ACK          2
 607 #define ISCSI_FLAG_SNACK_TYPE_RDATA             3
 608 #define ISCSI_FLAG_SNACK_TYPE_MASK      0x0F    /* 4 bits */
 609
 610 /* Reject Message Header */
 611 struct iscsi_reject {
 612         uint8_t opcode;
 613         uint8_t flags;
 614         uint8_t reason;
 615         uint8_t rsvd2;
 616         uint8_t hlength;
 617         uint8_t dlength[3];
 618         uint8_t rsvd3[8];
 619         __be32  ffffffff;
 620         uint8_t rsvd4[4];
 621         __be32  statsn;
 622         __be32  exp_cmdsn;
 623         __be32  max_cmdsn;
 624         __be32  datasn;
 625         uint8_t rsvd5[8];
 626         /* Text - Rejected hdr */
 627 };
 628
 629 /* Reason for Reject */
 630 #define ISCSI_REASON_CMD_BEFORE_LOGIN   1
 631 #define ISCSI_REASON_DATA_DIGEST_ERROR  2
 632 #define ISCSI_REASON_DATA_SNACK_REJECT  3
 633 #define ISCSI_REASON_PROTOCOL_ERROR     4
 634 #define ISCSI_REASON_CMD_NOT_SUPPORTED  5
 635 #define ISCSI_REASON_IMM_CMD_REJECT             6
 636 #define ISCSI_REASON_TASK_IN_PROGRESS   7
 637 #define ISCSI_REASON_INVALID_SNACK              8
 638 #define ISCSI_REASON_BOOKMARK_INVALID   9
 639 #define ISCSI_REASON_BOOKMARK_NO_RESOURCES      10
 640 #define ISCSI_REASON_NEGOTIATION_RESET  11
 641
 642 /* Max. number of Key=Value pairs in a text message */
 643 #define MAX_KEY_VALUE_PAIRS     8192
 644
 645 /* maximum length for text keys/values */
 646 #define KEY_MAXLEN              64
 647 #define VALUE_MAXLEN            255
 648 #define TARGET_NAME_MAXLEN      VALUE_MAXLEN
 649
 650 #define ISCSI_DEF_MAX_RECV_SEG_LEN              8192
 651 #define ISCSI_MIN_MAX_RECV_SEG_LEN              512
 652 #define ISCSI_MAX_MAX_RECV_SEG_LEN              16777215
 653
 654 #define ISCSI_DEF_FIRST_BURST_LEN               65536
 655 #define ISCSI_MIN_FIRST_BURST_LEN               512
 656 #define ISCSI_MAX_FIRST_BURST_LEN               16777215
 657
 658 #define ISCSI_DEF_MAX_BURST_LEN                 262144
 659 #define ISCSI_MIN_MAX_BURST_LEN                 512
 660 #define ISCSI_MAX_MAX_BURST_LEN                 16777215
 661
 662 #define ISCSI_DEF_TIME2WAIT                     2
 663
 664 /************************* RFC 3720 End *****************************/
 665
 666 #endif /* ISCSI_PROTO_H */