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
34static inline int iscsi_sna_lt(u32 n1, u32 n2)
35{
36	return (s32)(n1 - n2) < 0;
37}
38
39static inline int iscsi_sna_lte(u32 n1, u32 n2)
40{
41	return (s32)(n1 - n2) <= 0;
42}
43
44static inline int iscsi_sna_gt(u32 n1, u32 n2)
45{
46	return (s32)(n1 - n2) > 0;
47}
48
49static 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 */
66typedef 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 */
76struct 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
127struct 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 */
138struct 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
166struct iscsi_rlength_ahdr {
167	__be16 ahslength;
168	uint8_t ahstype;
169	uint8_t reserved;
170	__be32 read_length;
171};
172
173/* Extended CDB AHS */
174struct 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 */
183struct 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 */
214struct 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 */
242struct 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 */
257struct 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 */
273struct 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 */
304struct 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 */
331struct 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 */
349struct 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 */
368struct 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 */
393struct 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 */
411struct 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 */
428struct 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 */
463struct 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 */
522struct 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 */
548struct 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 */
575struct 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 */
600struct 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