linux/include/scsi/iscsi_proto.h
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   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
  45static inline int iscsi_sna_lt(u32 n1, u32 n2)
  46{
  47        return (s32)(n1 - n2) < 0;
  48}
  49
  50static inline int iscsi_sna_lte(u32 n1, u32 n2)
  51{
  52        return (s32)(n1 - n2) <= 0;
  53}
  54
  55static inline int iscsi_sna_gt(u32 n1, u32 n2)
  56{
  57        return (s32)(n1 - n2) > 0;
  58}
  59
  60static 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 */
  77typedef 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 */
  87struct 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
 138struct 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 */
 149struct 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
 177struct iscsi_rlength_ahdr {
 178        __be16 ahslength;
 179        uint8_t ahstype;
 180        uint8_t reserved;
 181        __be32 read_length;
 182};
 183
 184/* Extended CDB AHS */
 185struct 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 */
 194struct 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 */
 225struct 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 */
 253struct 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 */
 268struct 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 */
 284struct 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 */
 315struct 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 */
 342struct 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 */
 360struct 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 */
 379struct 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 */
 404struct 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 */
 422struct 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 */
 439struct 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 */
 474struct 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 */
 533struct 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 */
 559struct 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 */
 586struct 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 */
 611struct 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#define ISCSI_NAME_LEN                          224
 665
 666/************************* RFC 3720 End *****************************/
 667
 668#endif /* ISCSI_PROTO_H */
 669
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