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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 [email protected]
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 */
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