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
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