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
45static inline int iscsi_sna_lt(u32 n1, u32 n2)
46{
47	return (s32)(n1 - n2) < 0;
48}
49
50static inline int iscsi_sna_lte(u32 n1, u32 n2)
51{
52	return (s32)(n1 - n2) <= 0;
53}
54
55static inline int iscsi_sna_gt(u32 n1, u32 n2)
56{
57	return (s32)(n1 - n2) > 0;
58}
59
60static 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 */
77typedef 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 */
87struct 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
138struct 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 */
149struct 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
177struct iscsi_rlength_ahdr {
178	__be16 ahslength;
179	uint8_t ahstype;
180	uint8_t reserved;
181	__be32 read_length;
182};
183
184/* Extended CDB AHS */
185struct 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 */
194struct 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 */
225struct 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 */
253struct 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 */
268struct 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 */
284struct 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 */
315struct 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 */
342struct 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 */
360struct 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 */
379struct 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 */
404struct 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 */
422struct 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 */
439struct 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 */
474struct 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 */
533struct 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 */
559struct 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 */
586struct 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 */
611struct 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