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