1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * RFC 3720 (iSCSI) protocol data types 4 * 5 * Copyright (C) 2005 Dmitry Yusupov 6 * Copyright (C) 2005 Alex Aizman 7 * maintained by open-iscsi@googlegroups.com 8 * 9 * See the file COPYING included with this distribution for more details. 10 */ 11 12 #ifndef ISCSI_PROTO_H 13 #define ISCSI_PROTO_H 14 15 #include <linux/types.h> 16 #include <scsi/scsi.h> 17 18 #define ISCSI_DRAFT20_VERSION 0x00 19 20 /* default iSCSI listen port for incoming connections */ 21 #define ISCSI_LISTEN_PORT 3260 22 23 /* iSCSI header length */ 24 #define ISCSI_HDR_LEN 48 25 26 /* iSCSI CRC32C length */ 27 #define ISCSI_CRC_LEN 4 28 29 /* Padding word length */ 30 #define ISCSI_PAD_LEN 4 31 32 /* 33 * Serial Number Arithmetic, 32 bits, RFC1982 34 */ 35 36 static inline int iscsi_sna_lt(u32 n1, u32 n2) 37 { 38 return (s32)(n1 - n2) < 0; 39 } 40 41 static inline int iscsi_sna_lte(u32 n1, u32 n2) 42 { 43 return (s32)(n1 - n2) <= 0; 44 } 45 46 static inline int iscsi_sna_gt(u32 n1, u32 n2) 47 { 48 return (s32)(n1 - n2) > 0; 49 } 50 51 static inline int iscsi_sna_gte(u32 n1, u32 n2) 52 { 53 return (s32)(n1 - n2) >= 0; 54 } 55 56 /* 57 * useful common(control and data pathes) macro 58 */ 59 #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2])) 60 #define hton24(p, v) { \ 61 p[0] = (((v) >> 16) & 0xFF); \ 62 p[1] = (((v) >> 8) & 0xFF); \ 63 p[2] = ((v) & 0xFF); \ 64 } 65 #define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;} 66 67 /* initiator tags; opaque for target */ 68 typedef uint32_t __bitwise itt_t; 69 /* below makes sense only for initiator that created this tag */ 70 #define build_itt(itt, age) ((__force itt_t)\ 71 ((itt) | ((age) << ISCSI_AGE_SHIFT))) 72 #define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK) 73 #define RESERVED_ITT ((__force itt_t)0xffffffff) 74 75 /* 76 * iSCSI Template Message Header 77 */ 78 struct iscsi_hdr { 79 uint8_t opcode; 80 uint8_t flags; /* Final bit */ 81 uint8_t rsvd2[2]; 82 uint8_t hlength; /* AHSs total length */ 83 uint8_t dlength[3]; /* Data length */ 84 struct scsi_lun lun; 85 itt_t itt; /* Initiator Task Tag, opaque for target */ 86 __be32 ttt; /* Target Task Tag */ 87 __be32 statsn; 88 __be32 exp_statsn; 89 __be32 max_statsn; 90 uint8_t other[12]; 91 }; 92 93 /************************* RFC 3720 Begin *****************************/ 94 95 #define ISCSI_RESERVED_TAG 0xffffffff 96 97 /* Opcode encoding bits */ 98 #define ISCSI_OP_RETRY 0x80 99 #define ISCSI_OP_IMMEDIATE 0x40 100 #define ISCSI_OPCODE_MASK 0x3F 101 102 /* Initiator Opcode values */ 103 #define ISCSI_OP_NOOP_OUT 0x00 104 #define ISCSI_OP_SCSI_CMD 0x01 105 #define ISCSI_OP_SCSI_TMFUNC 0x02 106 #define ISCSI_OP_LOGIN 0x03 107 #define ISCSI_OP_TEXT 0x04 108 #define ISCSI_OP_SCSI_DATA_OUT 0x05 109 #define ISCSI_OP_LOGOUT 0x06 110 #define ISCSI_OP_SNACK 0x10 111 112 #define ISCSI_OP_VENDOR1_CMD 0x1c 113 #define ISCSI_OP_VENDOR2_CMD 0x1d 114 #define ISCSI_OP_VENDOR3_CMD 0x1e 115 #define ISCSI_OP_VENDOR4_CMD 0x1f 116 117 /* Target Opcode values */ 118 #define ISCSI_OP_NOOP_IN 0x20 119 #define ISCSI_OP_SCSI_CMD_RSP 0x21 120 #define ISCSI_OP_SCSI_TMFUNC_RSP 0x22 121 #define ISCSI_OP_LOGIN_RSP 0x23 122 #define ISCSI_OP_TEXT_RSP 0x24 123 #define ISCSI_OP_SCSI_DATA_IN 0x25 124 #define ISCSI_OP_LOGOUT_RSP 0x26 125 #define ISCSI_OP_R2T 0x31 126 #define ISCSI_OP_ASYNC_EVENT 0x32 127 #define ISCSI_OP_REJECT 0x3f 128 129 struct iscsi_ahs_hdr { 130 __be16 ahslength; 131 uint8_t ahstype; 132 uint8_t ahspec[5]; 133 }; 134 135 #define ISCSI_AHSTYPE_CDB 1 136 #define ISCSI_AHSTYPE_RLENGTH 2 137 #define ISCSI_CDB_SIZE 16 138 139 /* iSCSI PDU Header */ 140 struct iscsi_scsi_req { 141 uint8_t opcode; 142 uint8_t flags; 143 __be16 rsvd2; 144 uint8_t hlength; 145 uint8_t dlength[3]; 146 struct scsi_lun lun; 147 itt_t itt; /* Initiator Task Tag */ 148 __be32 data_length; 149 __be32 cmdsn; 150 __be32 exp_statsn; 151 uint8_t cdb[ISCSI_CDB_SIZE]; /* SCSI Command Block */ 152 /* Additional Data (Command Dependent) */ 153 }; 154 155 /* Command PDU flags */ 156 #define ISCSI_FLAG_CMD_FINAL 0x80 157 #define ISCSI_FLAG_CMD_READ 0x40 158 #define ISCSI_FLAG_CMD_WRITE 0x20 159 #define ISCSI_FLAG_CMD_ATTR_MASK 0x07 /* 3 bits */ 160 161 /* SCSI Command Attribute values */ 162 #define ISCSI_ATTR_UNTAGGED 0 163 #define ISCSI_ATTR_SIMPLE 1 164 #define ISCSI_ATTR_ORDERED 2 165 #define ISCSI_ATTR_HEAD_OF_QUEUE 3 166 #define ISCSI_ATTR_ACA 4 167 168 struct iscsi_rlength_ahdr { 169 __be16 ahslength; 170 uint8_t ahstype; 171 uint8_t reserved; 172 __be32 read_length; 173 }; 174 175 /* Extended CDB AHS */ 176 struct iscsi_ecdb_ahdr { 177 __be16 ahslength; /* CDB length - 15, including reserved byte */ 178 uint8_t ahstype; 179 uint8_t reserved; 180 /* 4-byte aligned extended CDB spillover */ 181 uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE]; 182 }; 183 184 /* SCSI Response Header */ 185 struct iscsi_scsi_rsp { 186 uint8_t opcode; 187 uint8_t flags; 188 uint8_t response; 189 uint8_t cmd_status; 190 uint8_t hlength; 191 uint8_t dlength[3]; 192 uint8_t rsvd[8]; 193 itt_t itt; /* Initiator Task Tag */ 194 __be32 rsvd1; 195 __be32 statsn; 196 __be32 exp_cmdsn; 197 __be32 max_cmdsn; 198 __be32 exp_datasn; 199 __be32 bi_residual_count; 200 __be32 residual_count; 201 /* Response or Sense Data (optional) */ 202 }; 203 204 /* Command Response PDU flags */ 205 #define ISCSI_FLAG_CMD_BIDI_OVERFLOW 0x10 206 #define ISCSI_FLAG_CMD_BIDI_UNDERFLOW 0x08 207 #define ISCSI_FLAG_CMD_OVERFLOW 0x04 208 #define ISCSI_FLAG_CMD_UNDERFLOW 0x02 209 210 /* iSCSI Status values. Valid if Rsp Selector bit is not set */ 211 #define ISCSI_STATUS_CMD_COMPLETED 0 212 #define ISCSI_STATUS_TARGET_FAILURE 1 213 #define ISCSI_STATUS_SUBSYS_FAILURE 2 214 215 /* Asynchronous Event Header */ 216 struct iscsi_async { 217 uint8_t opcode; 218 uint8_t flags; 219 uint8_t rsvd2[2]; 220 uint8_t rsvd3; 221 uint8_t dlength[3]; 222 struct scsi_lun lun; 223 uint8_t rsvd4[8]; 224 __be32 statsn; 225 __be32 exp_cmdsn; 226 __be32 max_cmdsn; 227 uint8_t async_event; 228 uint8_t async_vcode; 229 __be16 param1; 230 __be16 param2; 231 __be16 param3; 232 uint8_t rsvd5[4]; 233 }; 234 235 /* iSCSI Event Codes */ 236 #define ISCSI_ASYNC_MSG_SCSI_EVENT 0 237 #define ISCSI_ASYNC_MSG_REQUEST_LOGOUT 1 238 #define ISCSI_ASYNC_MSG_DROPPING_CONNECTION 2 239 #define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS 3 240 #define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION 4 241 #define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC 255 242 243 /* NOP-Out Message */ 244 struct iscsi_nopout { 245 uint8_t opcode; 246 uint8_t flags; 247 __be16 rsvd2; 248 uint8_t rsvd3; 249 uint8_t dlength[3]; 250 struct scsi_lun lun; 251 itt_t itt; /* Initiator Task Tag */ 252 __be32 ttt; /* Target Transfer Tag */ 253 __be32 cmdsn; 254 __be32 exp_statsn; 255 uint8_t rsvd4[16]; 256 }; 257 258 /* NOP-In Message */ 259 struct iscsi_nopin { 260 uint8_t opcode; 261 uint8_t flags; 262 __be16 rsvd2; 263 uint8_t rsvd3; 264 uint8_t dlength[3]; 265 struct scsi_lun lun; 266 itt_t itt; /* Initiator Task Tag */ 267 __be32 ttt; /* Target Transfer Tag */ 268 __be32 statsn; 269 __be32 exp_cmdsn; 270 __be32 max_cmdsn; 271 uint8_t rsvd4[12]; 272 }; 273 274 /* SCSI Task Management Message Header */ 275 struct iscsi_tm { 276 uint8_t opcode; 277 uint8_t flags; 278 uint8_t rsvd1[2]; 279 uint8_t hlength; 280 uint8_t dlength[3]; 281 struct scsi_lun lun; 282 itt_t itt; /* Initiator Task Tag */ 283 itt_t rtt; /* Reference Task Tag */ 284 __be32 cmdsn; 285 __be32 exp_statsn; 286 __be32 refcmdsn; 287 __be32 exp_datasn; 288 uint8_t rsvd2[8]; 289 }; 290 291 #define ISCSI_FLAG_TM_FUNC_MASK 0x7F 292 293 /* Function values */ 294 #define ISCSI_TM_FUNC_ABORT_TASK 1 295 #define ISCSI_TM_FUNC_ABORT_TASK_SET 2 296 #define ISCSI_TM_FUNC_CLEAR_ACA 3 297 #define ISCSI_TM_FUNC_CLEAR_TASK_SET 4 298 #define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET 5 299 #define ISCSI_TM_FUNC_TARGET_WARM_RESET 6 300 #define ISCSI_TM_FUNC_TARGET_COLD_RESET 7 301 #define ISCSI_TM_FUNC_TASK_REASSIGN 8 302 303 #define ISCSI_TM_FUNC_VALUE(hdr) ((hdr)->flags & ISCSI_FLAG_TM_FUNC_MASK) 304 305 /* SCSI Task Management Response Header */ 306 struct iscsi_tm_rsp { 307 uint8_t opcode; 308 uint8_t flags; 309 uint8_t response; /* see Response values below */ 310 uint8_t qualifier; 311 uint8_t hlength; 312 uint8_t dlength[3]; 313 uint8_t rsvd2[8]; 314 itt_t itt; /* Initiator Task Tag */ 315 itt_t rtt; /* Reference Task Tag */ 316 __be32 statsn; 317 __be32 exp_cmdsn; 318 __be32 max_cmdsn; 319 uint8_t rsvd3[12]; 320 }; 321 322 /* Response values */ 323 #define ISCSI_TMF_RSP_COMPLETE 0x00 324 #define ISCSI_TMF_RSP_NO_TASK 0x01 325 #define ISCSI_TMF_RSP_NO_LUN 0x02 326 #define ISCSI_TMF_RSP_TASK_ALLEGIANT 0x03 327 #define ISCSI_TMF_RSP_NO_FAILOVER 0x04 328 #define ISCSI_TMF_RSP_NOT_SUPPORTED 0x05 329 #define ISCSI_TMF_RSP_AUTH_FAILED 0x06 330 #define ISCSI_TMF_RSP_REJECTED 0xff 331 332 /* Ready To Transfer Header */ 333 struct iscsi_r2t_rsp { 334 uint8_t opcode; 335 uint8_t flags; 336 uint8_t rsvd2[2]; 337 uint8_t hlength; 338 uint8_t dlength[3]; 339 struct scsi_lun lun; 340 itt_t itt; /* Initiator Task Tag */ 341 __be32 ttt; /* Target Transfer Tag */ 342 __be32 statsn; 343 __be32 exp_cmdsn; 344 __be32 max_cmdsn; 345 __be32 r2tsn; 346 __be32 data_offset; 347 __be32 data_length; 348 }; 349 350 /* SCSI Data Hdr */ 351 struct iscsi_data { 352 uint8_t opcode; 353 uint8_t flags; 354 uint8_t rsvd2[2]; 355 uint8_t rsvd3; 356 uint8_t dlength[3]; 357 struct scsi_lun lun; 358 itt_t itt; 359 __be32 ttt; 360 __be32 rsvd4; 361 __be32 exp_statsn; 362 __be32 rsvd5; 363 __be32 datasn; 364 __be32 offset; 365 __be32 rsvd6; 366 /* Payload */ 367 }; 368 369 /* SCSI Data Response Hdr */ 370 struct iscsi_data_rsp { 371 uint8_t opcode; 372 uint8_t flags; 373 uint8_t rsvd2; 374 uint8_t cmd_status; 375 uint8_t hlength; 376 uint8_t dlength[3]; 377 struct scsi_lun lun; 378 itt_t itt; 379 __be32 ttt; 380 __be32 statsn; 381 __be32 exp_cmdsn; 382 __be32 max_cmdsn; 383 __be32 datasn; 384 __be32 offset; 385 __be32 residual_count; 386 }; 387 388 /* Data Response PDU flags */ 389 #define ISCSI_FLAG_DATA_ACK 0x40 390 #define ISCSI_FLAG_DATA_OVERFLOW 0x04 391 #define ISCSI_FLAG_DATA_UNDERFLOW 0x02 392 #define ISCSI_FLAG_DATA_STATUS 0x01 393 394 /* Text Header */ 395 struct iscsi_text { 396 uint8_t opcode; 397 uint8_t flags; 398 uint8_t rsvd2[2]; 399 uint8_t hlength; 400 uint8_t dlength[3]; 401 uint8_t rsvd4[8]; 402 itt_t itt; 403 __be32 ttt; 404 __be32 cmdsn; 405 __be32 exp_statsn; 406 uint8_t rsvd5[16]; 407 /* Text - key=value pairs */ 408 }; 409 410 #define ISCSI_FLAG_TEXT_CONTINUE 0x40 411 412 /* Text Response Header */ 413 struct iscsi_text_rsp { 414 uint8_t opcode; 415 uint8_t flags; 416 uint8_t rsvd2[2]; 417 uint8_t hlength; 418 uint8_t dlength[3]; 419 uint8_t rsvd4[8]; 420 itt_t itt; 421 __be32 ttt; 422 __be32 statsn; 423 __be32 exp_cmdsn; 424 __be32 max_cmdsn; 425 uint8_t rsvd5[12]; 426 /* Text Response - key:value pairs */ 427 }; 428 429 /* Login Header */ 430 struct iscsi_login_req { 431 uint8_t opcode; 432 uint8_t flags; 433 uint8_t max_version; /* Max. version supported */ 434 uint8_t min_version; /* Min. version supported */ 435 uint8_t hlength; 436 uint8_t dlength[3]; 437 uint8_t isid[6]; /* Initiator Session ID */ 438 __be16 tsih; /* Target Session Handle */ 439 itt_t itt; /* Initiator Task Tag */ 440 __be16 cid; 441 __be16 rsvd3; 442 __be32 cmdsn; 443 __be32 exp_statsn; 444 uint8_t rsvd5[16]; 445 }; 446 447 /* Login PDU flags */ 448 #define ISCSI_FLAG_LOGIN_TRANSIT 0x80 449 #define ISCSI_FLAG_LOGIN_CONTINUE 0x40 450 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK 0x0C /* 2 bits */ 451 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE1 0x04 452 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE2 0x08 453 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE3 0x0C 454 #define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK 0x03 /* 2 bits */ 455 #define ISCSI_FLAG_LOGIN_NEXT_STAGE1 0x01 456 #define ISCSI_FLAG_LOGIN_NEXT_STAGE2 0x02 457 #define ISCSI_FLAG_LOGIN_NEXT_STAGE3 0x03 458 459 #define ISCSI_LOGIN_CURRENT_STAGE(flags) \ 460 ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) 461 #define ISCSI_LOGIN_NEXT_STAGE(flags) \ 462 (flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK) 463 464 /* Login Response Header */ 465 struct iscsi_login_rsp { 466 uint8_t opcode; 467 uint8_t flags; 468 uint8_t max_version; /* Max. version supported */ 469 uint8_t active_version; /* Active version */ 470 uint8_t hlength; 471 uint8_t dlength[3]; 472 uint8_t isid[6]; /* Initiator Session ID */ 473 __be16 tsih; /* Target Session Handle */ 474 itt_t itt; /* Initiator Task Tag */ 475 __be32 rsvd3; 476 __be32 statsn; 477 __be32 exp_cmdsn; 478 __be32 max_cmdsn; 479 uint8_t status_class; /* see Login RSP ststus classes below */ 480 uint8_t status_detail; /* see Login RSP Status details below */ 481 uint8_t rsvd4[10]; 482 }; 483 484 /* Login stage (phase) codes for CSG, NSG */ 485 #define ISCSI_INITIAL_LOGIN_STAGE -1 486 #define ISCSI_SECURITY_NEGOTIATION_STAGE 0 487 #define ISCSI_OP_PARMS_NEGOTIATION_STAGE 1 488 #define ISCSI_FULL_FEATURE_PHASE 3 489 490 /* Login Status response classes */ 491 #define ISCSI_STATUS_CLS_SUCCESS 0x00 492 #define ISCSI_STATUS_CLS_REDIRECT 0x01 493 #define ISCSI_STATUS_CLS_INITIATOR_ERR 0x02 494 #define ISCSI_STATUS_CLS_TARGET_ERR 0x03 495 496 /* Login Status response detail codes */ 497 /* Class-0 (Success) */ 498 #define ISCSI_LOGIN_STATUS_ACCEPT 0x00 499 500 /* Class-1 (Redirection) */ 501 #define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP 0x01 502 #define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM 0x02 503 504 /* Class-2 (Initiator Error) */ 505 #define ISCSI_LOGIN_STATUS_INIT_ERR 0x00 506 #define ISCSI_LOGIN_STATUS_AUTH_FAILED 0x01 507 #define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN 0x02 508 #define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND 0x03 509 #define ISCSI_LOGIN_STATUS_TGT_REMOVED 0x04 510 #define ISCSI_LOGIN_STATUS_NO_VERSION 0x05 511 #define ISCSI_LOGIN_STATUS_ISID_ERROR 0x06 512 #define ISCSI_LOGIN_STATUS_MISSING_FIELDS 0x07 513 #define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED 0x08 514 #define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE 0x09 515 #define ISCSI_LOGIN_STATUS_NO_SESSION 0x0a 516 #define ISCSI_LOGIN_STATUS_INVALID_REQUEST 0x0b 517 518 /* Class-3 (Target Error) */ 519 #define ISCSI_LOGIN_STATUS_TARGET_ERROR 0x00 520 #define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE 0x01 521 #define ISCSI_LOGIN_STATUS_NO_RESOURCES 0x02 522 523 /* Logout Header */ 524 struct iscsi_logout { 525 uint8_t opcode; 526 uint8_t flags; 527 uint8_t rsvd1[2]; 528 uint8_t hlength; 529 uint8_t dlength[3]; 530 uint8_t rsvd2[8]; 531 itt_t itt; /* Initiator Task Tag */ 532 __be16 cid; 533 uint8_t rsvd3[2]; 534 __be32 cmdsn; 535 __be32 exp_statsn; 536 uint8_t rsvd4[16]; 537 }; 538 539 /* Logout PDU flags */ 540 #define ISCSI_FLAG_LOGOUT_REASON_MASK 0x7F 541 542 /* logout reason_code values */ 543 544 #define ISCSI_LOGOUT_REASON_CLOSE_SESSION 0 545 #define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION 1 546 #define ISCSI_LOGOUT_REASON_RECOVERY 2 547 #define ISCSI_LOGOUT_REASON_AEN_REQUEST 3 548 549 /* Logout Response Header */ 550 struct iscsi_logout_rsp { 551 uint8_t opcode; 552 uint8_t flags; 553 uint8_t response; /* see Logout response values below */ 554 uint8_t rsvd2; 555 uint8_t hlength; 556 uint8_t dlength[3]; 557 uint8_t rsvd3[8]; 558 itt_t itt; /* Initiator Task Tag */ 559 __be32 rsvd4; 560 __be32 statsn; 561 __be32 exp_cmdsn; 562 __be32 max_cmdsn; 563 __be32 rsvd5; 564 __be16 t2wait; 565 __be16 t2retain; 566 __be32 rsvd6; 567 }; 568 569 /* logout response status values */ 570 571 #define ISCSI_LOGOUT_SUCCESS 0 572 #define ISCSI_LOGOUT_CID_NOT_FOUND 1 573 #define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED 2 574 #define ISCSI_LOGOUT_CLEANUP_FAILED 3 575 576 /* SNACK Header */ 577 struct iscsi_snack { 578 uint8_t opcode; 579 uint8_t flags; 580 uint8_t rsvd2[2]; 581 uint8_t hlength; 582 uint8_t dlength[3]; 583 uint8_t lun[8]; 584 itt_t itt; 585 __be32 ttt; 586 uint8_t rsvd3[4]; 587 __be32 exp_statsn; 588 uint8_t rsvd4[8]; 589 __be32 begrun; 590 __be32 runlength; 591 }; 592 593 /* SNACK PDU flags */ 594 #define ISCSI_FLAG_SNACK_TYPE_DATA 0 595 #define ISCSI_FLAG_SNACK_TYPE_R2T 0 596 #define ISCSI_FLAG_SNACK_TYPE_STATUS 1 597 #define ISCSI_FLAG_SNACK_TYPE_DATA_ACK 2 598 #define ISCSI_FLAG_SNACK_TYPE_RDATA 3 599 #define ISCSI_FLAG_SNACK_TYPE_MASK 0x0F /* 4 bits */ 600 601 /* Reject Message Header */ 602 struct iscsi_reject { 603 uint8_t opcode; 604 uint8_t flags; 605 uint8_t reason; 606 uint8_t rsvd2; 607 uint8_t hlength; 608 uint8_t dlength[3]; 609 uint8_t rsvd3[8]; 610 __be32 ffffffff; 611 uint8_t rsvd4[4]; 612 __be32 statsn; 613 __be32 exp_cmdsn; 614 __be32 max_cmdsn; 615 __be32 datasn; 616 uint8_t rsvd5[8]; 617 /* Text - Rejected hdr */ 618 }; 619 620 /* Reason for Reject */ 621 #define ISCSI_REASON_CMD_BEFORE_LOGIN 1 622 #define ISCSI_REASON_DATA_DIGEST_ERROR 2 623 #define ISCSI_REASON_DATA_SNACK_REJECT 3 624 #define ISCSI_REASON_PROTOCOL_ERROR 4 625 #define ISCSI_REASON_CMD_NOT_SUPPORTED 5 626 #define ISCSI_REASON_IMM_CMD_REJECT 6 627 #define ISCSI_REASON_TASK_IN_PROGRESS 7 628 #define ISCSI_REASON_INVALID_SNACK 8 629 #define ISCSI_REASON_BOOKMARK_INVALID 9 630 #define ISCSI_REASON_BOOKMARK_NO_RESOURCES 10 631 #define ISCSI_REASON_NEGOTIATION_RESET 11 632 633 /* Max. number of Key=Value pairs in a text message */ 634 #define MAX_KEY_VALUE_PAIRS 8192 635 636 /* maximum length for text keys/values */ 637 #define KEY_MAXLEN 64 638 #define VALUE_MAXLEN 255 639 #define TARGET_NAME_MAXLEN VALUE_MAXLEN 640 641 #define ISCSI_DEF_MAX_RECV_SEG_LEN 8192 642 #define ISCSI_MIN_MAX_RECV_SEG_LEN 512 643 #define ISCSI_MAX_MAX_RECV_SEG_LEN 16777215 644 645 #define ISCSI_DEF_FIRST_BURST_LEN 65536 646 #define ISCSI_MIN_FIRST_BURST_LEN 512 647 #define ISCSI_MAX_FIRST_BURST_LEN 16777215 648 649 #define ISCSI_DEF_MAX_BURST_LEN 262144 650 #define ISCSI_MIN_MAX_BURST_LEN 512 651 #define ISCSI_MAX_MAX_BURST_LEN 16777215 652 653 #define ISCSI_DEF_TIME2WAIT 2 654 655 #define ISCSI_NAME_LEN 224 656 657 /************************* RFC 3720 End *****************************/ 658 659 #endif /* ISCSI_PROTO_H */ 660