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 #define ISCSI_NAME_LEN 224 665 666 /************************* RFC 3720 End *****************************/ 667 668 #endif /* ISCSI_PROTO_H */ 669