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source: vbox/trunk/src/VBox/Storage/ISCSI.cpp@ 103005

Last change on this file since 103005 was 99739, checked in by vboxsync, 13 months ago
*: doxygen corrections (mostly about removing @returns from functions returning void).
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 199.7 KB

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1	/* $Id: ISCSI.cpp 99739 2023-05-11 01:01:08Z vboxsync $ */
2	/** @file
3	* iSCSI initiator driver, VD backend.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_VD_ISCSI
33	#include <VBox/vd-plugin.h>
34	#include <VBox/err.h>
35
36	#include <VBox/log.h>
37	#include <iprt/alloc.h>
38	#include <iprt/assert.h>
39	#include <iprt/uuid.h>
40	#include <iprt/string.h>
41	#include <iprt/asm.h>
42	#include <iprt/thread.h>
43	#include <iprt/semaphore.h>
44	#include <iprt/md5.h>
45	#include <iprt/tcp.h>
46	#include <iprt/time.h>
47	#include <VBox/scsi.h>
48
49	#include "VDBackends.h"
50	#include "VDBackendsInline.h"
51
52
53	/*********************************************************************************************************************************
54	* Defined Constants And Macros *
55	*********************************************************************************************************************************/
56
57	/** The maximum number of release log entries per image. */
58	#define MAX_LOG_REL_ERRORS 1024
59
60	/** Default port number to use for iSCSI. */
61	#define ISCSI_DEFAULT_PORT 3260
62
63
64	/** Converts a number in the range of 0 - 15 into the corresponding hex char. */
65	#define NUM_2_HEX(b) ('0' + (b) + (((b) > 9) ? 39 : 0))
66	/** Converts a hex char into the corresponding number in the range 0-15. */
67	#define HEX_2_NUM(c) (((c) <= '9') ? ((c) - '0') : (((c - 'A' + 10) & 0xf)))
68	/* Converts a base64 char into the corresponding number in the range 0-63. */
69	#define B64_2_NUM(c) ((c >= 'A' && c <= 'Z') ? (c - 'A') : (c >= 'a' && c <= 'z') ? (c - 'a' + 26) : (c >= '0' && c <= '9') ? (c - '0' + 52) : (c == '+') ? 62 : (c == '/') ? 63 : -1)
70
71
72	/** Minimum CHAP_MD5 challenge length in bytes. */
73	#define CHAP_MD5_CHALLENGE_MIN 16
74	/** Maximum CHAP_MD5 challenge length in bytes. */
75	#define CHAP_MD5_CHALLENGE_MAX 24
76
77
78	/**
79	* SCSI peripheral device type. */
80	typedef enum SCSIDEVTYPE
81	{
82	/** direct-access device. */
83	SCSI_DEVTYPE_DISK = 0,
84	/** sequential-access device. */
85	SCSI_DEVTYPE_TAPE,
86	/** printer device. */
87	SCSI_DEVTYPE_PRINTER,
88	/** processor device. */
89	SCSI_DEVTYPE_PROCESSOR,
90	/** write-once device. */
91	SCSI_DEVTYPE_WORM,
92	/** CD/DVD device. */
93	SCSI_DEVTYPE_CDROM,
94	/** scanner device. */
95	SCSI_DEVTYPE_SCANNER,
96	/** optical memory device. */
97	SCSI_DEVTYPE_OPTICAL,
98	/** medium changer. */
99	SCSI_DEVTYPE_CHANGER,
100	/** communications device. */
101	SCSI_DEVTYPE_COMMUNICATION,
102	/** storage array controller device. */
103	SCSI_DEVTYPE_RAIDCTL = 0x0c,
104	/** enclosure services device. */
105	SCSI_DEVTYPE_ENCLOSURE,
106	/** simplified direct-access device. */
107	SCSI_DEVTYPE_SIMPLEDISK,
108	/** optical card reader/writer device. */
109	SCSI_DEVTYPE_OCRW,
110	/** bridge controller device. */
111	SCSI_DEVTYPE_BRIDGE,
112	/** object-based storage device. */
113	SCSI_DEVTYPE_OSD
114	} SCSIDEVTYPE;
115
116	/** Mask for extracting the SCSI device type out of the first byte of the INQUIRY response. */
117	#define SCSI_DEVTYPE_MASK 0x1f
118
119	/** Mask to extract the CmdQue bit out of the seventh byte of the INQUIRY response. */
120	#define SCSI_INQUIRY_CMDQUE_MASK 0x02
121
122	/** Maximum PDU payload size we can handle in one piece. Greater or equal than
123	* s_iscsiConfigDefaultWriteSplit. */
124	#define ISCSI_DATA_LENGTH_MAX _256K
125
126	/** Maximum PDU size we can handle in one piece. */
127	#define ISCSI_RECV_PDU_BUFFER_SIZE (ISCSI_DATA_LENGTH_MAX + ISCSI_BHS_SIZE)
128
129
130	/** Version of the iSCSI standard which this initiator driver can handle. */
131	#define ISCSI_MY_VERSION 0
132
133
134	/** Length of ISCSI basic header segment. */
135	#define ISCSI_BHS_SIZE 48
136
137
138	/** Reserved task tag value. */
139	#define ISCSI_TASK_TAG_RSVD 0xffffffff
140
141
142	/**
143	* iSCSI opcodes. */
144	typedef enum ISCSIOPCODE
145	{
146	/** NOP-Out. */
147	ISCSIOP_NOP_OUT = 0x00000000,
148	/** SCSI command. */
149	ISCSIOP_SCSI_CMD = 0x01000000,
150	/** SCSI task management request. */
151	ISCSIOP_SCSI_TASKMGMT_REQ = 0x02000000,
152	/** Login request. */
153	ISCSIOP_LOGIN_REQ = 0x03000000,
154	/** Text request. */
155	ISCSIOP_TEXT_REQ = 0x04000000,
156	/** SCSI Data-Out. */
157	ISCSIOP_SCSI_DATA_OUT = 0x05000000,
158	/** Logout request. */
159	ISCSIOP_LOGOUT_REQ = 0x06000000,
160	/** SNACK request. */
161	ISCSIOP_SNACK_REQ = 0x10000000,
162
163	/** NOP-In. */
164	ISCSIOP_NOP_IN = 0x20000000,
165	/** SCSI response. */
166	ISCSIOP_SCSI_RES = 0x21000000,
167	/** SCSI Task Management response. */
168	ISCSIOP_SCSI_TASKMGMT_RES = 0x22000000,
169	/** Login response. */
170	ISCSIOP_LOGIN_RES = 0x23000000,
171	/** Text response. */
172	ISCSIOP_TEXT_RES = 0x24000000,
173	/** SCSI Data-In. */
174	ISCSIOP_SCSI_DATA_IN = 0x25000000,
175	/** Logout response. */
176	ISCSIOP_LOGOUT_RES = 0x26000000,
177	/** Ready To Transfer (R2T). */
178	ISCSIOP_R2T = 0x31000000,
179	/** Asynchronous message. */
180	ISCSIOP_ASYN_MSG = 0x32000000,
181	/** Reject. */
182	ISCSIOP_REJECT = 0x3f000000
183	} ISCSIOPCODE;
184
185	/** Mask for extracting the iSCSI opcode out of the first header word. */
186	#define ISCSIOP_MASK 0x3f000000
187
188
189	/** ISCSI BHS word 0: Request should be processed immediately. */
190	#define ISCSI_IMMEDIATE_DELIVERY_BIT 0x40000000
191
192	/** ISCSI BHS word 0: This is the final PDU for this request/response. */
193	#define ISCSI_FINAL_BIT 0x00800000
194	/** ISCSI BHS word 0: Mask for extracting the CSG. */
195	#define ISCSI_CSG_MASK 0x000c0000
196	/** ISCSI BHS word 0: Shift offset for extracting the CSG. */
197	#define ISCSI_CSG_SHIFT 18
198	/** ISCSI BHS word 0: Mask for extracting the NSG. */
199	#define ISCSI_NSG_MASK 0x00030000
200	/** ISCSI BHS word 0: Shift offset for extracting the NSG. */
201	#define ISCSI_NSG_SHIFT 16
202
203	/** ISCSI BHS word 0: task attribute untagged */
204	#define ISCSI_TASK_ATTR_UNTAGGED 0x00000000
205	/** ISCSI BHS word 0: task attribute simple */
206	#define ISCSI_TASK_ATTR_SIMPLE 0x00010000
207	/** ISCSI BHS word 0: task attribute ordered */
208	#define ISCSI_TASK_ATTR_ORDERED 0x00020000
209	/** ISCSI BHS word 0: task attribute head of queue */
210	#define ISCSI_TASK_ATTR_HOQ 0x00030000
211	/** ISCSI BHS word 0: task attribute ACA */
212	#define ISCSI_TASK_ATTR_ACA 0x00040000
213
214	/** ISCSI BHS word 0: transit to next login phase. */
215	#define ISCSI_TRANSIT_BIT 0x00800000
216	/** ISCSI BHS word 0: continue with login negotiation. */
217	#define ISCSI_CONTINUE_BIT 0x00400000
218
219	/** ISCSI BHS word 0: residual underflow. */
220	#define ISCSI_RESIDUAL_UNFL_BIT 0x00020000
221	/** ISCSI BHS word 0: residual overflow. */
222	#define ISCSI_RESIDUAL_OVFL_BIT 0x00040000
223	/** ISCSI BHS word 0: Bidirectional read residual underflow. */
224	#define ISCSI_BI_READ_RESIDUAL_UNFL_BIT 0x00080000
225	/** ISCSI BHS word 0: Bidirectional read residual overflow. */
226	#define ISCSI_BI_READ_RESIDUAL_OVFL_BIT 0x00100000
227
228	/** ISCSI BHS word 0: SCSI response mask. */
229	#define ISCSI_SCSI_RESPONSE_MASK 0x0000ff00
230	/** ISCSI BHS word 0: SCSI status mask. */
231	#define ISCSI_SCSI_STATUS_MASK 0x000000ff
232
233	/** ISCSI BHS word 0: response includes status. */
234	#define ISCSI_STATUS_BIT 0x00010000
235
236	/** Maximum number of scatter/gather segments needed to send a PDU. */
237	#define ISCSI_SG_SEGMENTS_MAX 4
238
239	/** Number of entries in the command table. */
240	#define ISCSI_CMD_WAITING_ENTRIES 32
241
242	/**
243	* iSCSI login status class. */
244	typedef enum ISCSILOGINSTATUSCLASS
245	{
246	/** Success. */
247	ISCSI_LOGIN_STATUS_CLASS_SUCCESS = 0,
248	/** Redirection. */
249	ISCSI_LOGIN_STATUS_CLASS_REDIRECTION,
250	/** Initiator error. */
251	ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR,
252	/** Target error. */
253	ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR
254	} ISCSILOGINSTATUSCLASS;
255
256
257	/**
258	* iSCSI connection state. */
259	typedef enum ISCSISTATE
260	{
261	/** Not having a connection/session at all. */
262	ISCSISTATE_FREE,
263	/** Currently trying to login. */
264	ISCSISTATE_IN_LOGIN,
265	/** Normal operation, corresponds roughly to the Full Feature Phase. */
266	ISCSISTATE_NORMAL,
267	/** Currently trying to logout. */
268	ISCSISTATE_IN_LOGOUT
269	} ISCSISTATE;
270
271	/**
272	* iSCSI PDU send/receive flags (and maybe more in the future). */
273	typedef enum ISCSIPDUFLAGS
274	{
275	/** No special flags */
276	ISCSIPDU_DEFAULT = 0,
277	/** Do not attempt to re-attach to the target if the connection is lost */
278	ISCSIPDU_NO_REATTACH = RT_BIT(1)
279	} ISCSIPDUFLAGS;
280
281
282	/*********************************************************************************************************************************
283	* Structures and Typedefs *
284	*********************************************************************************************************************************/
285
286	/**
287	* iSCSI login negotiation parameter
288	*/
289	typedef struct ISCSIPARAMETER
290	{
291	/** Name of the parameter. */
292	const char *pszParamName;
293	/** Value of the parameter. */
294	const char *pszParamValue;
295	/** Length of the binary parameter. 0=zero-terminated string. */
296	size_t cbParamValue;
297	} ISCSIPARAMETER;
298
299
300	/**
301	* iSCSI Response PDU buffer (scatter).
302	*/
303	typedef struct ISCSIRES
304	{
305	/** Length of PDU segment. */
306	size_t cbSeg;
307	/** Pointer to PDU segment. */
308	void *pvSeg;
309	} ISCSIRES;
310	/** Pointer to an iSCSI Response PDU buffer. */
311	typedef ISCSIRES *PISCSIRES;
312	/** Pointer to a const iSCSI Response PDU buffer. */
313	typedef ISCSIRES const *PCISCSIRES;
314
315
316	/**
317	* iSCSI Request PDU buffer (gather).
318	*/
319	typedef struct ISCSIREQ
320	{
321	/** Length of PDU segment in bytes. */
322	size_t cbSeg;
323	/** Pointer to PDU segment. */
324	const void *pcvSeg;
325	} ISCSIREQ;
326	/** Pointer to an iSCSI Request PDU buffer. */
327	typedef ISCSIREQ *PISCSIREQ;
328	/** Pointer to a const iSCSI Request PDU buffer. */
329	typedef ISCSIREQ const *PCISCSIREQ;
330
331
332	/**
333	* SCSI transfer directions.
334	*/
335	typedef enum SCSIXFER
336	{
337	SCSIXFER_NONE = 0,
338	SCSIXFER_TO_TARGET,
339	SCSIXFER_FROM_TARGET,
340	SCSIXFER_TO_FROM_TARGET
341	} SCSIXFER, *PSCSIXFER;
342
343	/** Forward declaration. */
344	typedef struct ISCSIIMAGE *PISCSIIMAGE;
345
346	/**
347	* SCSI request structure.
348	*/
349	typedef struct SCSIREQ
350	{
351	/** I/O context associated with this request. */
352	PVDIOCTX pIoCtx;
353	/** Transfer direction. */
354	SCSIXFER enmXfer;
355	/** Length of command block. */
356	size_t cbCDB;
357	/** Length of Initiator2Target data buffer. */
358	size_t cbI2TData;
359	/** Length of Target2Initiator data buffer. */
360	size_t cbT2IData;
361	/** Length of sense buffer
362	* This contains the number of sense bytes received upon completion. */
363	size_t cbSense;
364	/** Completion status of the command. */
365	uint8_t status;
366	/** The CDB. */
367	uint8_t abCDB[16];
368	/** The sense buffer. */
369	uint8_t abSense[96];
370	/** Status code to return if we got sense data. */
371	int rcSense;
372	/** Pointer to the Initiator2Target S/G list. */
373	PRTSGSEG paI2TSegs;
374	/** Number of entries in the I2T S/G list. */
375	unsigned cI2TSegs;
376	/** Pointer to the Target2Initiator S/G list. */
377	PRTSGSEG paT2ISegs;
378	/** Number of entries in the T2I S/G list. */
379	unsigned cT2ISegs;
380	/** S/G buffer for the target to initiator bits. */
381	RTSGBUF SgBufT2I;
382	/** Number of retries if the command completes with sense
383	* data before we return with an error.
384	*/
385	unsigned cSenseRetries;
386	/** The S/G list - variable in size.
387	* This array holds both the I2T and T2I segments.
388	* The I2T segments are first and the T2I are second.
389	*/
390	RTSGSEG aSegs[1];
391	} SCSIREQ, *PSCSIREQ;
392
393	typedef enum ISCSICMDTYPE
394	{
395	/** Process a SCSI request. */
396	ISCSICMDTYPE_REQ = 0,
397	/** Call a function in the I/O thread. */
398	ISCSICMDTYPE_EXEC,
399	/** Usual 32bit hack. */
400	ISCSICMDTYPE_32BIT_HACK = 0x7fffffff
401	} ISCSICMDTYPE;
402
403
404	/** The command completion function. */
405	typedef DECLCALLBACKTYPE(void, FNISCSICMDCOMPLETED,(PISCSIIMAGE pImage, int rcReq, void *pvUser));
406	/** Pointer to a command completion function. */
407	typedef FNISCSICMDCOMPLETED *PFNISCSICMDCOMPLETED;
408
409	/** The command execution function. */
410	typedef DECLCALLBACKTYPE(int, FNISCSIEXEC,(void *pvUser));
411	/** Pointer to a command execution function. */
412	typedef FNISCSIEXEC *PFNISCSIEXEC;
413
414	/**
415	* Structure used to complete a synchronous request.
416	*/
417	typedef struct ISCSICMDSYNC
418	{
419	/** Event semaphore to wakeup the waiting thread. */
420	RTSEMEVENT EventSem;
421	/** Status code of the command. */
422	int rcCmd;
423	} ISCSICMDSYNC, *PISCSICMDSYNC;
424
425	/**
426	* iSCSI command.
427	* Used to forward requests to the I/O thread
428	* if existing.
429	*/
430	typedef struct ISCSICMD
431	{
432	/** Next one in the list. */
433	struct ISCSICMD *pNext;
434	/** Assigned ITT. */
435	uint32_t Itt;
436	/** Completion callback. */
437	PFNISCSICMDCOMPLETED pfnComplete;
438	/** Opaque user data. */
439	void *pvUser;
440	/** Command to execute. */
441	ISCSICMDTYPE enmCmdType;
442	/** Command type dependent data. */
443	union
444	{
445	/** Process a SCSI request. */
446	struct
447	{
448	/** The SCSI request to process. */
449	PSCSIREQ pScsiReq;
450	} ScsiReq;
451	/** Call a function in the I/O thread. */
452	struct
453	{
454	/** The method to execute. */
455	PFNISCSIEXEC pfnExec;
456	/** User data. */
457	void *pvUser;
458	} Exec;
459	} CmdType;
460	} ISCSICMD, *PISCSICMD;
461
462	/**
463	* Send iSCSI PDU.
464	* Contains all necessary data to send a PDU.
465	*/
466	typedef struct ISCSIPDUTX
467	{
468	/** Pointer to the next PDu to send. */
469	struct ISCSIPDUTX *pNext;
470	/** The BHS. */
471	uint32_t aBHS[12];
472	/** Assigned CmdSN for this PDU. */
473	uint32_t CmdSN;
474	/** The S/G buffer used for sending. */
475	RTSGBUF SgBuf;
476	/** Number of bytes to send until the PDU completed. */
477	size_t cbSgLeft;
478	/** The iSCSI command this PDU belongs to. */
479	PISCSICMD pIScsiCmd;
480	/** Number of segments in the request segments array. */
481	unsigned cISCSIReq;
482	/** The request segments - variable in size. */
483	RTSGSEG aISCSIReq[1];
484	} ISCSIPDUTX, *PISCSIPDUTX;
485
486	/**
487	* Block driver instance data.
488	*/
489	typedef struct ISCSIIMAGE
490	{
491	/** Pointer to the filename (location). Not really used. */
492	const char *pszFilename;
493	/** Pointer to the initiator name. */
494	char *pszInitiatorName;
495	/** Pointer to the target name. */
496	char *pszTargetName;
497	/** Pointer to the target address. */
498	char *pszTargetAddress;
499	/** Pointer to the user name for authenticating the Initiator. */
500	char *pszInitiatorUsername;
501	/** Pointer to the secret for authenticating the Initiator. */
502	uint8_t *pbInitiatorSecret;
503	/** Length of the secret for authenticating the Initiator. */
504	size_t cbInitiatorSecret;
505	/** Pointer to the user name for authenticating the Target. */
506	char *pszTargetUsername;
507	/** Pointer to the secret for authenticating the Initiator. */
508	uint8_t *pbTargetSecret;
509	/** Length of the secret for authenticating the Initiator. */
510	size_t cbTargetSecret;
511	/** Limit for iSCSI writes, essentially limiting the amount of data
512	* written in a single write. This is negotiated with the target, so
513	* the actual size might be smaller. */
514	uint32_t cbWriteSplit;
515	/** Initiator session identifier. */
516	uint64_t ISID;
517	/** SCSI Logical Unit Number. */
518	uint64_t LUN;
519	/** Pointer to the per-disk VD interface list. */
520	PVDINTERFACE pVDIfsDisk;
521	/** Pointer to the per-image VD interface list. */
522	PVDINTERFACE pVDIfsImage;
523	/** Error interface. */
524	PVDINTERFACEERROR pIfError;
525	/** Config interface. */
526	PVDINTERFACECONFIG pIfConfig;
527	/** I/O interface. */
528	PVDINTERFACEIOINT pIfIo;
529	/** TCP network stack interface. */
530	PVDINTERFACETCPNET pIfNet;
531	/** Image open flags. */
532	unsigned uOpenFlags;
533	/** Number of re-login retries when a connection fails. */
534	uint32_t cISCSIRetries;
535	/** Sector size on volume. */
536	uint32_t cbSector;
537	/** Size of volume in sectors. */
538	uint64_t cVolume;
539	/** Total volume size in bytes. Easier than multiplying the above values all the time. */
540	uint64_t cbSize;
541
542	/** Negotiated maximum data length when sending to target. */
543	uint32_t cbSendDataLength;
544	/** Negotiated maximum data length when receiving from target. */
545	uint32_t cbRecvDataLength;
546
547	/** Current state of the connection/session. */
548	ISCSISTATE state;
549	/** Flag whether the first Login Response PDU has been seen. */
550	bool FirstRecvPDU;
551	/** Initiator Task Tag of the last iSCSI request PDU. */
552	uint32_t ITT;
553	/** Sequence number of the last command. */
554	uint32_t CmdSN;
555	/** Sequence number of the next command expected by the target. */
556	uint32_t ExpCmdSN;
557	/** Maximum sequence number accepted by the target (determines size of window). */
558	uint32_t MaxCmdSN;
559	/** Expected sequence number of next status. */
560	uint32_t ExpStatSN;
561	/** Currently active request. */
562	PISCSIREQ paCurrReq;
563	/** Segment number of currently active request. */
564	uint32_t cnCurrReq;
565	/** Pointer to receive PDU buffer. (Freed by RT) */
566	void *pvRecvPDUBuf;
567	/** Length of receive PDU buffer. */
568	size_t cbRecvPDUBuf;
569	/** Mutex protecting against concurrent use from several threads. */
570	RTSEMMUTEX Mutex;
571
572	/** Pointer to the target hostname. */
573	char *pszHostname;
574	/** Port to use on the target host. */
575	uint32_t uPort;
576	/** Socket handle of the TCP connection. */
577	VDSOCKET Socket;
578	/** Timeout for read operations on the TCP connection (in milliseconds). */
579	uint32_t uReadTimeout;
580	/** Flag whether to automatically generate the initiator name. */
581	bool fAutomaticInitiatorName;
582	/** Flag whether to automatically determine the LUN. */
583	bool fAutomaticLUN;
584	/** Flag whether to use the host IP stack or DevINIP. */
585	bool fHostIP;
586	/** Flag whether to dump malformed packets in the release log. */
587	bool fDumpMalformedPackets;
588	/** Flag whtether the target is readonly. */
589	bool fTargetReadOnly;
590	/** Flag whether to retry the connection before processing new requests. */
591	bool fTryReconnect;
592
593	/** Head of request queue */
594	PISCSICMD pScsiReqQueue;
595	/** Mutex protecting the request queue from concurrent access. */
596	RTSEMMUTEX MutexReqQueue;
597	/** I/O thread. */
598	RTTHREAD hThreadIo;
599	/** Flag whether the thread should be still running. */
600	volatile bool fRunning;
601	/* Flag whether the target supports command queuing. */
602	bool fCmdQueuingSupported;
603	/** Flag whether extended select is supported. */
604	bool fExtendedSelectSupported;
605	/** Padding used for aligning the PDUs. */
606	uint8_t aPadding[4];
607	/** Socket events to poll for. */
608	uint32_t fPollEvents;
609	/** Number of bytes to read to complete the current PDU. */
610	size_t cbRecvPDUResidual;
611	/** Current position in the PDU buffer. */
612	uint8_t *pbRecvPDUBufCur;
613	/** Flag whether we are currently reading the BHS. */
614	bool fRecvPDUBHS;
615	/** List of PDUs waiting to get transmitted. */
616	PISCSIPDUTX pIScsiPDUTxHead;
617	/** Tail of PDUs waiting to get transmitted. */
618	PISCSIPDUTX pIScsiPDUTxTail;
619	/** PDU we are currently transmitting. */
620	PISCSIPDUTX pIScsiPDUTxCur;
621	/** Number of commands waiting for an answer from the target.
622	* Used for timeout handling for poll.
623	*/
624	unsigned cCmdsWaiting;
625	/** Table of commands waiting for a response from the target. */
626	PISCSICMD aCmdsWaiting[ISCSI_CMD_WAITING_ENTRIES];
627	/** Number of logins since last successful I/O.
628	* Used to catch the case where logging succeeds but
629	* processing read/write/flushes cause a disconnect.
630	*/
631	volatile uint32_t cLoginsSinceIo;
632
633	/** Release log counter. */
634	unsigned cLogRelErrors;
635	/** The static region list. */
636	VDREGIONLIST RegionList;
637	} ISCSIIMAGE;
638
639
640	/*********************************************************************************************************************************
641	* Static Variables *
642	*********************************************************************************************************************************/
643
644	/** Default initiator basename. */
645	static const char *s_iscsiDefaultInitiatorBasename = "iqn.2009-08.com.sun.virtualbox.initiator";
646
647	/** Default LUN. */
648	static const char *s_iscsiConfigDefaultLUN = "0";
649
650	/** Default timeout, 10 seconds. */
651	static const char *s_iscsiConfigDefaultTimeout = "10000";
652
653	/** Default write split value, less or equal to ISCSI_DATA_LENGTH_MAX. */
654	static const char *s_iscsiConfigDefaultWriteSplit = "262144";
655
656	/** Default host IP stack. */
657	static const char *s_iscsiConfigDefaultHostIPStack = "1";
658
659	/** Default dump malformed packet configuration value. */
660	static const char *s_iscsiConfigDefaultDumpMalformedPackets = "0";
661
662	/** Description of all accepted config parameters. */
663	static const VDCONFIGINFO s_iscsiConfigInfo[] =
664	{
665	{ "TargetName", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
666	/* LUN is defined of string type to handle the "enc" prefix. */
667	{ "LUN", s_iscsiConfigDefaultLUN, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
668	{ "TargetAddress", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
669	{ "InitiatorName", NULL, VDCFGVALUETYPE_STRING, 0 },
670	{ "InitiatorUsername", NULL, VDCFGVALUETYPE_STRING, 0 },
671	{ "InitiatorSecret", NULL, VDCFGVALUETYPE_BYTES, 0 },
672	{ "TargetUsername", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_EXPERT },
673	{ "TargetSecret", NULL, VDCFGVALUETYPE_BYTES, VD_CFGKEY_EXPERT },
674	{ "WriteSplit", s_iscsiConfigDefaultWriteSplit, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
675	{ "Timeout", s_iscsiConfigDefaultTimeout, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
676	{ "HostIPStack", s_iscsiConfigDefaultHostIPStack, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
677	{ "DumpMalformedPackets", s_iscsiConfigDefaultDumpMalformedPackets, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
678	{ NULL, NULL, VDCFGVALUETYPE_INTEGER, 0 }
679	};
680
681
682	/*********************************************************************************************************************************
683	* Internal Functions *
684	*********************************************************************************************************************************/
685
686	/* iSCSI low-level functions (only to be used from the iSCSI high-level functions). */
687	static uint32_t iscsiNewITT(PISCSIIMAGE pImage);
688	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq, uint32_t uFlags);
689	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes, uint32_t fFlags);
690	static int iscsiRecvPDUAsync(PISCSIIMAGE pImage);
691	static int iscsiSendPDUAsync(PISCSIIMAGE pImage);
692	static int iscsiValidatePDU(PISCSIRES paRes, uint32_t cnRes);
693	static int iscsiRecvPDUProcess(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes);
694	static int iscsiPDUTxPrepare(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd);
695	static int iscsiRecvPDUUpdateRequest(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes);
696	static void iscsiCmdComplete(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd, int rcCmd);
697	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char pcszKey, const char pcszValue, size_t cbValue);
698	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue);
699	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue);
700	static int iscsiUpdateParameters(PISCSIIMAGE pImage, const uint8_t *pbBuf, size_t cbBuf);
701
702	/* Serial number arithmetic comparison. */
703	static bool serial_number_less(uint32_t sn1, uint32_t sn2);
704	static bool serial_number_greater(uint32_t sn1, uint32_t sn2);
705
706	/* CHAP-MD5 functions. */
707	#ifdef IMPLEMENT_TARGET_AUTH
708	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge);
709	#endif
710	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
711	const uint8_t *pbSecret, size_t cbSecret);
712
713	/**
714	* Internal: release log wrapper limiting the number of entries.
715	*/
716	DECLINLINE(void) iscsiLogRel(PISCSIIMAGE pImage, const char *pcszFormat, ...)
717	{
718	if (pImage->cLogRelErrors++ < MAX_LOG_REL_ERRORS)
719	{
720	va_list va;
721
722	va_start(va, pcszFormat);
723	LogRel(("%N\n", pcszFormat, &va));
724	va_end(va);
725	}
726	}
727
728	DECLINLINE(bool) iscsiIsClientConnected(PISCSIIMAGE pImage)
729	{
730	return pImage->Socket != NIL_VDSOCKET
731	&& pImage->pIfNet->pfnIsClientConnected(pImage->Socket);
732	}
733
734	/**
735	* Calculates the hash for the given ITT used
736	* to look up the command in the table.
737	*/
738	DECLINLINE(uint32_t) iscsiIttHash(uint32_t Itt)
739	{
740	return Itt % ISCSI_CMD_WAITING_ENTRIES;
741	}
742
743	static PISCSICMD iscsiCmdGetFromItt(PISCSIIMAGE pImage, uint32_t Itt)
744	{
745	PISCSICMD pIScsiCmd = NULL;
746
747	pIScsiCmd = pImage->aCmdsWaiting[iscsiIttHash(Itt)];
748
749	while ( pIScsiCmd
750	&& pIScsiCmd->Itt != Itt)
751	pIScsiCmd = pIScsiCmd->pNext;
752
753	return pIScsiCmd;
754	}
755
756	static void iscsiCmdInsert(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
757	{
758	PISCSICMD pIScsiCmdOld;
759	uint32_t idx = iscsiIttHash(pIScsiCmd->Itt);
760
761	Assert(!pIScsiCmd->pNext);
762
763	pIScsiCmdOld = pImage->aCmdsWaiting[idx];
764	pIScsiCmd->pNext = pIScsiCmdOld;
765	pImage->aCmdsWaiting[idx] = pIScsiCmd;
766	pImage->cCmdsWaiting++;
767	}
768
769	static PISCSICMD iscsiCmdRemove(PISCSIIMAGE pImage, uint32_t Itt)
770	{
771	PISCSICMD pIScsiCmd = NULL;
772	PISCSICMD pIScsiCmdPrev = NULL;
773	uint32_t idx = iscsiIttHash(Itt);
774
775	pIScsiCmd = pImage->aCmdsWaiting[idx];
776
777	while ( pIScsiCmd
778	&& pIScsiCmd->Itt != Itt)
779	{
780	pIScsiCmdPrev = pIScsiCmd;
781	pIScsiCmd = pIScsiCmd->pNext;
782	}
783
784	if (pIScsiCmd)
785	{
786	if (pIScsiCmdPrev)
787	{
788	AssertPtrNull(pIScsiCmd->pNext);
789	pIScsiCmdPrev->pNext = pIScsiCmd->pNext;
790	}
791	else
792	{
793	pImage->aCmdsWaiting[idx] = pIScsiCmd->pNext;
794	AssertPtrNull(pImage->aCmdsWaiting[idx]);
795	}
796	pImage->cCmdsWaiting--;
797	}
798
799	return pIScsiCmd;
800	}
801
802	/**
803	* Removes all commands from the table and returns the
804	* list head
805	*
806	* @returns Pointer to the head of the command list.
807	* @param pImage iSCSI connection to use.
808	*/
809	static PISCSICMD iscsiCmdRemoveAll(PISCSIIMAGE pImage)
810	{
811	PISCSICMD pIScsiCmdHead = NULL;
812
813	for (unsigned idx = 0; idx < RT_ELEMENTS(pImage->aCmdsWaiting); idx++)
814	{
815	PISCSICMD pHead;
816	PISCSICMD pTail;
817
818	pHead = pImage->aCmdsWaiting[idx];
819	pImage->aCmdsWaiting[idx] = NULL;
820
821	if (pHead)
822	{
823	/* Get the tail. */
824	pTail = pHead;
825	while (pTail->pNext)
826	pTail = pTail->pNext;
827
828	/* Concatenate. */
829	pTail->pNext = pIScsiCmdHead;
830	pIScsiCmdHead = pHead;
831	}
832	}
833	pImage->cCmdsWaiting = 0;
834
835	return pIScsiCmdHead;
836	}
837
838	/**
839	* Dumps an iSCSI packet if enabled.
840	*
841	* @param pImage The iSCSI image instance data.
842	* @param paISCSISegs Pointer to the segments array.
843	* @param cnISCSISegs Number of segments in the array.
844	* @param rc Status code for this packet.
845	* @param fRequest Flag whether this is request or response packet.
846	*/
847	static void iscsiDumpPacket(PISCSIIMAGE pImage, PISCSIREQ paISCSISegs, unsigned cnISCSISegs, int rc, bool fRequest)
848	{
849	if (pImage->fDumpMalformedPackets)
850	{
851	LogRel(("iSCSI{%s}: Dumping %s packet completed with status code %Rrc\n", pImage->pszTargetName, fRequest ? "request" : "response", rc));
852	for (unsigned i = 0; i < cnISCSISegs; i++)
853	{
854	if (paISCSISegs[i].cbSeg)
855	{
856	LogRel(("iSCSI{%s}: Segment %u, size %zu\n"
857	"%.*Rhxd\n",
858	pImage->pszTargetName, i, paISCSISegs[i].cbSeg,
859	paISCSISegs[i].cbSeg, paISCSISegs[i].pcvSeg));
860	}
861	}
862	}
863	}
864
865	static int iscsiTransportConnect(PISCSIIMAGE pImage)
866	{
867	int rc;
868	if (!pImage->pszHostname)
869	return VERR_NET_DEST_ADDRESS_REQUIRED;
870
871	rc = pImage->pIfNet->pfnClientConnect(pImage->Socket, pImage->pszHostname, pImage->uPort, pImage->uReadTimeout);
872	if (RT_FAILURE(rc))
873	{
874	if ( rc == VERR_NET_CONNECTION_REFUSED
875	\|\| rc == VERR_NET_CONNECTION_RESET
876	\|\| rc == VERR_NET_UNREACHABLE
877	\|\| rc == VERR_NET_HOST_UNREACHABLE
878	\|\| rc == VERR_NET_CONNECTION_TIMED_OUT)
879	{
880	/* Standardize return value for no connection. */
881	rc = VERR_NET_CONNECTION_REFUSED;
882	}
883	return rc;
884	}
885
886	/* Disable Nagle algorithm, we want things to be sent immediately. */
887	pImage->pIfNet->pfnSetSendCoalescing(pImage->Socket, false);
888
889	/* Make initiator name and ISID unique on this host. */
890	RTNETADDR LocalAddr;
891	rc = pImage->pIfNet->pfnGetLocalAddress(pImage->Socket, &LocalAddr);
892	if (RT_FAILURE(rc))
893	return rc;
894	if ( LocalAddr.uPort == RTNETADDR_PORT_NA
895	\|\| LocalAddr.uPort > 65535)
896	return VERR_NET_ADDRESS_FAMILY_NOT_SUPPORTED;
897	pImage->ISID &= ~65535ULL;
898	pImage->ISID \|= LocalAddr.uPort;
899	/* Eliminate the port so that it isn't included below. */
900	LocalAddr.uPort = RTNETADDR_PORT_NA;
901	if (pImage->fAutomaticInitiatorName)
902	{
903	if (pImage->pszInitiatorName)
904	RTStrFree(pImage->pszInitiatorName);
905	RTStrAPrintf(&pImage->pszInitiatorName, "%s:01:%RTnaddr",
906	s_iscsiDefaultInitiatorBasename, &LocalAddr);
907	if (!pImage->pszInitiatorName)
908	return VERR_NO_MEMORY;
909	}
910	LogRel(("iSCSI: connect from initiator %s with source port %u\n", pImage->pszInitiatorName, pImage->ISID & 65535));
911	return VINF_SUCCESS;
912	}
913
914
915	static int iscsiTransportClose(PISCSIIMAGE pImage)
916	{
917	int rc;
918
919	LogFlowFunc(("(%s:%d)\n", pImage->pszHostname, pImage->uPort));
920	if (iscsiIsClientConnected(pImage))
921	{
922	LogRel(("iSCSI: disconnect from initiator %s with source port %u\n", pImage->pszInitiatorName, pImage->ISID & 65535));
923	rc = pImage->pIfNet->pfnClientClose(pImage->Socket);
924	}
925	else
926	rc = VINF_SUCCESS;
927	LogFlowFunc(("returns %Rrc\n", rc));
928	return rc;
929	}
930
931
932	static int iscsiTransportRead(PISCSIIMAGE pImage, PISCSIRES paResponse, unsigned int cnResponse)
933	{
934	int rc = VINF_SUCCESS;
935	unsigned int i = 0;
936	size_t cbToRead, cbActuallyRead, residual, cbSegActual = 0, cbAHSLength, cbDataLength;
937	char *pDst;
938
939	LogFlowFunc(("cnResponse=%d (%s:%d)\n", cnResponse, pImage->pszHostname, pImage->uPort));
940	if (!iscsiIsClientConnected(pImage))
941	{
942	/* Reconnecting makes no sense in this case, as there will be nothing
943	* to receive. We would just run into a timeout. */
944	rc = VERR_BROKEN_PIPE;
945	}
946
947	if (RT_SUCCESS(rc) && paResponse[0].cbSeg >= ISCSI_BHS_SIZE)
948	{
949	cbToRead = 0;
950	residual = ISCSI_BHS_SIZE; /* Do not read more than the BHS length before the true PDU length is known. */
951	cbSegActual = residual;
952	pDst = (char *)paResponse[i].pvSeg;
953	uint64_t u64Timeout = RTTimeMilliTS() + pImage->uReadTimeout;
954	do
955	{
956	int64_t cMilliesRemaining = u64Timeout - RTTimeMilliTS();
957	if (cMilliesRemaining <= 0)
958	{
959	rc = VERR_TIMEOUT;
960	break;
961	}
962	Assert(cMilliesRemaining < 1000000);
963	rc = pImage->pIfNet->pfnSelectOne(pImage->Socket, cMilliesRemaining);
964	if (RT_FAILURE(rc))
965	break;
966	rc = pImage->pIfNet->pfnRead(pImage->Socket, pDst, residual, &cbActuallyRead);
967	if (RT_FAILURE(rc))
968	break;
969	if (cbActuallyRead == 0)
970	{
971	/* The other end has closed the connection. */
972	iscsiTransportClose(pImage);
973	pImage->state = ISCSISTATE_FREE;
974	rc = VERR_NET_CONNECTION_RESET;
975	break;
976	}
977	if (cbToRead == 0)
978	{
979	/* Currently reading the BHS. */
980	residual -= cbActuallyRead;
981	pDst += cbActuallyRead;
982	if (residual <= 40)
983	{
984	/* Enough data read to figure out the actual PDU size. */
985	uint32_t word1 = RT_N2H_U32(((uint32_t *)(paResponse[0].pvSeg))[1]);
986	cbAHSLength = (word1 & 0xff000000) >> 24;
987	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
988	cbDataLength = word1 & 0x00ffffff;
989	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
990	cbToRead = residual + cbAHSLength + cbDataLength;
991	residual += paResponse[0].cbSeg - ISCSI_BHS_SIZE;
992	if (residual > cbToRead)
993	residual = cbToRead;
994	cbSegActual = ISCSI_BHS_SIZE + cbAHSLength + cbDataLength;
995	/* Check whether we are already done with this PDU (no payload). */
996	if (cbToRead == 0)
997	break;
998	}
999	}
1000	else
1001	{
1002	cbToRead -= cbActuallyRead;
1003	if (cbToRead == 0)
1004	break;
1005	pDst += cbActuallyRead;
1006	residual -= cbActuallyRead;
1007	}
1008	if (residual == 0)
1009	{
1010	i++;
1011	if (i >= cnResponse)
1012	{
1013	/* No space left in receive buffers. */
1014	rc = VERR_BUFFER_OVERFLOW;
1015	break;
1016	}
1017	pDst = (char *)paResponse[i].pvSeg;
1018	residual = paResponse[i].cbSeg;
1019	if (residual > cbToRead)
1020	residual = cbToRead;
1021	cbSegActual = residual;
1022	}
1023	LogFlowFunc(("cbToRead=%u residual=%u cbSegActual=%u cbActuallRead=%u\n",
1024	cbToRead, residual, cbSegActual, cbActuallyRead));
1025	} while (true);
1026	}
1027	else
1028	{
1029	if (RT_SUCCESS(rc))
1030	rc = VERR_BUFFER_OVERFLOW;
1031	}
1032	if (RT_SUCCESS(rc))
1033	{
1034	paResponse[i].cbSeg = cbSegActual;
1035	for (i++; i < cnResponse; i++)
1036	paResponse[i].cbSeg = 0;
1037	}
1038
1039	if (RT_UNLIKELY( RT_FAILURE(rc)
1040	&& ( rc == VERR_NET_CONNECTION_RESET
1041	\|\| rc == VERR_NET_CONNECTION_ABORTED
1042	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
1043	\|\| rc == VERR_NET_CONNECTION_REFUSED
1044	\|\| rc == VERR_BROKEN_PIPE)))
1045	{
1046	/* Standardize return value for broken connection. */
1047	rc = VERR_BROKEN_PIPE;
1048	}
1049
1050	LogFlowFunc(("returns %Rrc\n", rc));
1051	return rc;
1052	}
1053
1054
1055	static int iscsiTransportWrite(PISCSIIMAGE pImage, PISCSIREQ paRequest, unsigned int cnRequest)
1056	{
1057	int rc = VINF_SUCCESS;
1058	unsigned int i;
1059
1060	LogFlowFunc(("cnRequest=%d (%s:%d)\n", cnRequest, pImage->pszHostname, pImage->uPort));
1061	if (!iscsiIsClientConnected(pImage))
1062	{
1063	/* Attempt to reconnect if the connection was previously broken. */
1064	rc = iscsiTransportConnect(pImage);
1065	}
1066
1067	if (RT_SUCCESS(rc))
1068	{
1069	/* Construct scatter/gather buffer for entire request, worst case
1070	* needs twice as many entries to allow for padding. */
1071	unsigned cBuf = 0;
1072	for (i = 0; i < cnRequest; i++)
1073	{
1074	cBuf++;
1075	if (paRequest[i].cbSeg & 3)
1076	cBuf++;
1077	}
1078	Assert(cBuf < ISCSI_SG_SEGMENTS_MAX);
1079	RTSGBUF buf;
1080	RTSGSEG aSeg[ISCSI_SG_SEGMENTS_MAX];
1081	static char aPad[4] = { 0, 0, 0, 0 };
1082	RTSgBufInit(&buf, &aSeg[0], cBuf);
1083	unsigned iBuf = 0;
1084	for (i = 0; i < cnRequest; i++)
1085	{
1086	/* Actual data chunk. */
1087	aSeg[iBuf].pvSeg = (void *)paRequest[i].pcvSeg;
1088	aSeg[iBuf].cbSeg = paRequest[i].cbSeg;
1089	iBuf++;
1090	/* Insert proper padding before the next chunk. */
1091	if (paRequest[i].cbSeg & 3)
1092	{
1093	aSeg[iBuf].pvSeg = &aPad[0];
1094	aSeg[iBuf].cbSeg = 4 - (paRequest[i].cbSeg & 3);
1095	iBuf++;
1096	}
1097	}
1098	/* Send out the request, the socket is set to send data immediately,
1099	* avoiding unnecessary delays. */
1100	rc = pImage->pIfNet->pfnSgWrite(pImage->Socket, &buf);
1101
1102	}
1103
1104	if (RT_UNLIKELY( RT_FAILURE(rc)
1105	&& ( rc == VERR_NET_CONNECTION_RESET
1106	\|\| rc == VERR_NET_CONNECTION_ABORTED
1107	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
1108	\|\| rc == VERR_NET_CONNECTION_REFUSED
1109	\|\| rc == VERR_BROKEN_PIPE)))
1110	{
1111	/* Standardize return value for broken connection. */
1112	rc = VERR_BROKEN_PIPE;
1113	}
1114
1115	LogFlowFunc(("returns %Rrc\n", rc));
1116	return rc;
1117	}
1118
1119
1120	static int iscsiTransportOpen(PISCSIIMAGE pImage)
1121	{
1122	int rc = VINF_SUCCESS;
1123	size_t cbHostname = 0; /* shut up gcc */
1124	const char pcszPort = NULL; / shut up gcc */
1125	char *pszPortEnd;
1126	uint16_t uPort;
1127
1128	/* Clean up previous connection data. */
1129	iscsiTransportClose(pImage);
1130	if (pImage->pszHostname)
1131	{
1132	RTMemFree(pImage->pszHostname);
1133	pImage->pszHostname = NULL;
1134	pImage->uPort = 0;
1135	}
1136
1137	/* Locate the port number via the colon separating the hostname from the port. */
1138	if (*pImage->pszTargetAddress)
1139	{
1140	if (*pImage->pszTargetAddress != '[')
1141	{
1142	/* Normal hostname or IPv4 dotted decimal. */
1143	pcszPort = strchr(pImage->pszTargetAddress, ':');
1144	if (pcszPort != NULL)
1145	{
1146	cbHostname = pcszPort - pImage->pszTargetAddress;
1147	pcszPort++;
1148	}
1149	else
1150	cbHostname = strlen(pImage->pszTargetAddress);
1151	}
1152	else
1153	{
1154	/* IPv6 literal address. Contains colons, so skip to closing square bracket. */
1155	pcszPort = strchr(pImage->pszTargetAddress, ']');
1156	if (pcszPort != NULL)
1157	{
1158	pcszPort++;
1159	cbHostname = pcszPort - pImage->pszTargetAddress;
1160	if (*pcszPort == '\0')
1161	pcszPort = NULL;
1162	else if (*pcszPort != ':')
1163	rc = VERR_PARSE_ERROR;
1164	else
1165	pcszPort++;
1166	}
1167	else
1168	rc = VERR_PARSE_ERROR;
1169	}
1170	}
1171	else
1172	rc = VERR_PARSE_ERROR;
1173
1174	/* Now split address into hostname and port. */
1175	if (RT_SUCCESS(rc))
1176	{
1177	pImage->pszHostname = (char *)RTMemAlloc(cbHostname + 1);
1178	if (!pImage->pszHostname)
1179	rc = VERR_NO_MEMORY;
1180	else
1181	{
1182	if (pImage->pszTargetAddress[0] == '[')
1183	memcpy(pImage->pszHostname, pImage->pszTargetAddress + 1, cbHostname);
1184	else
1185	memcpy(pImage->pszHostname, pImage->pszTargetAddress, cbHostname);
1186	pImage->pszHostname[cbHostname] = '\0';
1187	if (pcszPort != NULL)
1188	{
1189	rc = RTStrToUInt16Ex(pcszPort, &pszPortEnd, 0, &uPort);
1190	/* Note that RT_SUCCESS() macro to check the rc value is not strict enough in this case. */
1191	if (rc == VINF_SUCCESS && *pszPortEnd == '\0' && uPort != 0)
1192	{
1193	pImage->uPort = uPort;
1194	}
1195	else
1196	{
1197	rc = VERR_PARSE_ERROR;
1198	}
1199	}
1200	else
1201	pImage->uPort = ISCSI_DEFAULT_PORT;
1202	}
1203	}
1204
1205	if (RT_SUCCESS(rc))
1206	{
1207	if (!iscsiIsClientConnected(pImage))
1208	rc = iscsiTransportConnect(pImage);
1209	}
1210	else
1211	{
1212	if (pImage->pszHostname)
1213	{
1214	RTMemFree(pImage->pszHostname);
1215	pImage->pszHostname = NULL;
1216	}
1217	pImage->uPort = 0;
1218	}
1219
1220	LogFlowFunc(("returns %Rrc\n", rc));
1221	return rc;
1222	}
1223
1224	/**
1225	* Returns a human readable version of the given initiator login error detail.
1226	*
1227	* @returns String with the error detail.
1228	* @param u8Detail The detail indicator from the response.
1229	*/
1230	static const char *iscsiGetLoginErrorDetail(uint8_t u8Detail)
1231	{
1232	const char *pszDetail = NULL;
1233
1234	switch (u8Detail)
1235	{
1236	case 0x00:
1237	pszDetail = "Miscelleanous iSCSI intiaitor error";
1238	break;
1239	case 0x01:
1240	pszDetail = "Authentication failure";
1241	break;
1242	case 0x02:
1243	pszDetail = "Authorization failure";
1244	break;
1245	case 0x03:
1246	pszDetail = "Not found";
1247	break;
1248	case 0x04:
1249	pszDetail = "Target removed";
1250	break;
1251	case 0x05:
1252	pszDetail = "Unsupported version";
1253	break;
1254	case 0x06:
1255	pszDetail = "Too many connections";
1256	break;
1257	case 0x07:
1258	pszDetail = "Missing parameter";
1259	break;
1260	case 0x08:
1261	pszDetail = "Can't include in session";
1262	break;
1263	case 0x09:
1264	pszDetail = "Session type not supported";
1265	break;
1266	case 0x0a:
1267	pszDetail = "Session does not exist";
1268	break;
1269	case 0x0b:
1270	pszDetail = "Invalid request type during login";
1271	break;
1272	default:
1273	pszDetail = "Unknown status detail";
1274	}
1275
1276	return pszDetail;
1277	}
1278
1279	/**
1280	* Attempts one login attempt to the given target.
1281	*
1282	* @returns VBox status code.
1283	* @retval VINF_TRY_AGAIN when getting redirected and having to start over.
1284	* @retval VERR_TRY_AGAIN in case the connection was lost while receiving a reply
1285	* from the target and the login attempt can be repeated.
1286	* @param pImage The iSCSI connection state to be used.
1287	*/
1288	static int iscsiLogin(PISCSIIMAGE pImage)
1289	{
1290	int rc = VINF_SUCCESS;
1291	uint32_t itt;
1292	uint32_t csg, nsg, substate;
1293	uint64_t isid_tsih;
1294	uint8_t bBuf[4096]; /* Should be large enough even for large authentication values. */
1295	size_t cbBuf;
1296	bool transit;
1297	uint8_t pbChallenge[1024]; /* RFC3720 specifies this as maximum. */
1298	size_t cbChallenge = 0; /* shut up gcc */
1299	uint8_t bChapIdx = 0; /* (MSC is used uninitialized) */
1300	uint8_t aResponse[RTMD5HASHSIZE];
1301	uint32_t cnISCSIReq = 0;
1302	ISCSIREQ aISCSIReq[4];
1303	uint32_t aReqBHS[12];
1304	uint32_t cnISCSIRes = 0;
1305	ISCSIRES aISCSIRes[2];
1306	uint32_t aResBHS[12];
1307	char *pszNext;
1308	bool fParameterNeg = true;
1309	pImage->cbRecvDataLength = ISCSI_DATA_LENGTH_MAX;
1310	pImage->cbSendDataLength = RT_MIN(ISCSI_DATA_LENGTH_MAX, pImage->cbWriteSplit);
1311	char szMaxDataLength[16];
1312	RTStrPrintf(szMaxDataLength, sizeof(szMaxDataLength), "%u", ISCSI_DATA_LENGTH_MAX);
1313	ISCSIPARAMETER aParameterNeg[] =
1314	{
1315	{ "HeaderDigest", "None", 0 },
1316	{ "DataDigest", "None", 0 },
1317	{ "MaxConnections", "1", 0 },
1318	{ "InitialR2T", "No", 0 },
1319	{ "ImmediateData", "Yes", 0 },
1320	{ "MaxRecvDataSegmentLength", szMaxDataLength, 0 },
1321	{ "MaxBurstLength", szMaxDataLength, 0 },
1322	{ "FirstBurstLength", szMaxDataLength, 0 },
1323	{ "DefaultTime2Wait", "0", 0 },
1324	{ "DefaultTime2Retain", "60", 0 },
1325	{ "DataPDUInOrder", "Yes", 0 },
1326	{ "DataSequenceInOrder", "Yes", 0 },
1327	{ "ErrorRecoveryLevel", "0", 0 },
1328	{ "MaxOutstandingR2T", "1", 0 }
1329	};
1330
1331	if (!iscsiIsClientConnected(pImage))
1332	{
1333	rc = iscsiTransportOpen(pImage);
1334	if (RT_FAILURE(rc))
1335	return rc;
1336	}
1337
1338	pImage->state = ISCSISTATE_IN_LOGIN;
1339	pImage->ITT = 1;
1340	pImage->FirstRecvPDU = true;
1341	pImage->CmdSN = 1;
1342	pImage->ExpCmdSN = 0;
1343	pImage->MaxCmdSN = 1;
1344	pImage->ExpStatSN = 0;
1345
1346	/*
1347	* Send login request to target.
1348	*/
1349	itt = iscsiNewITT(pImage);
1350	csg = 0;
1351	nsg = 0;
1352	substate = 0;
1353	isid_tsih = pImage->ISID << 16; /* TSIH field currently always 0 */
1354
1355	do
1356	{
1357	transit = false;
1358	cbBuf = 0;
1359	/* Handle all cases with a single switch statement. */
1360	switch (csg << 8 \| substate)
1361	{
1362	case 0x0000: /* security negotiation, step 0: propose authentication. */
1363	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "SessionType", "Normal", 0);
1364	if (RT_FAILURE(rc))
1365	break;
1366	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "InitiatorName", pImage->pszInitiatorName, 0);
1367	if (RT_FAILURE(rc))
1368	break;
1369	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "TargetName", pImage->pszTargetName, 0);
1370	if (RT_FAILURE(rc))
1371	break;
1372	if (pImage->pszInitiatorUsername == NULL)
1373	{
1374	/* No authentication. Immediately switch to next phase. */
1375	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "None", 0);
1376	if (RT_FAILURE(rc))
1377	break;
1378	nsg = 1;
1379	transit = true;
1380	}
1381	else
1382	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "CHAP,None", 0);
1383	break;
1384	case 0x0001: /* security negotiation, step 1: propose CHAP_MD5 variant. */
1385	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_A", "5", 0);
1386	break;
1387	case 0x0002: /* security negotiation, step 2: send authentication info. */
1388	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_N", pImage->pszInitiatorUsername, 0);
1389	if (RT_FAILURE(rc))
1390	break;
1391	chap_md5_compute_response(aResponse, bChapIdx, pbChallenge, cbChallenge,
1392	pImage->pbInitiatorSecret, pImage->cbInitiatorSecret);
1393	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_R", (const char *)aResponse, RTMD5HASHSIZE);
1394	if (RT_FAILURE(rc))
1395	break;
1396	nsg = 1;
1397	transit = true;
1398	break;
1399	case 0x0100: /* login operational negotiation, step 0: set parameters. */
1400	if (fParameterNeg)
1401	{
1402	for (unsigned i = 0; i < RT_ELEMENTS(aParameterNeg); i++)
1403	{
1404	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf,
1405	aParameterNeg[i].pszParamName,
1406	aParameterNeg[i].pszParamValue,
1407	aParameterNeg[i].cbParamValue);
1408	if (RT_FAILURE(rc))
1409	break;
1410	}
1411	fParameterNeg = false;
1412	}
1413
1414	nsg = 3;
1415	transit = true;
1416	break;
1417	case 0x0300: /* full feature phase. */
1418	default:
1419	/* Should never come here. */
1420	AssertMsgFailed(("send: Undefined login state %d substate %d\n", csg, substate));
1421	break;
1422	}
1423
1424	if (RT_FAILURE(rc))
1425	break;
1426
1427	aReqBHS[0] = RT_H2N_U32( ISCSI_IMMEDIATE_DELIVERY_BIT
1428	\| (csg << ISCSI_CSG_SHIFT)
1429	\| (transit ? (nsg << ISCSI_NSG_SHIFT \| ISCSI_TRANSIT_BIT) : 0)
1430	\| ISCSI_MY_VERSION /* Minimum version. */
1431	\| (ISCSI_MY_VERSION << 8) /* Maximum version. */
1432	\| ISCSIOP_LOGIN_REQ); /* C=0 */
1433	aReqBHS[1] = RT_H2N_U32((uint32_t)cbBuf); /* TotalAHSLength=0 */
1434	aReqBHS[2] = RT_H2N_U32(isid_tsih >> 32);
1435	aReqBHS[3] = RT_H2N_U32(isid_tsih & 0xffffffff);
1436	aReqBHS[4] = itt;
1437	aReqBHS[5] = RT_H2N_U32(1 << 16); /* CID=1,reserved */
1438	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1439	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1440	aReqBHS[8] = 0; /* reserved */
1441	aReqBHS[9] = 0; /* reserved */
1442	aReqBHS[10] = 0; /* reserved */
1443	aReqBHS[11] = 0; /* reserved */
1444
1445	cnISCSIReq = 0;
1446	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1447	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1448	cnISCSIReq++;
1449
1450	aISCSIReq[cnISCSIReq].pcvSeg = bBuf;
1451	aISCSIReq[cnISCSIReq].cbSeg = cbBuf;
1452	cnISCSIReq++;
1453
1454	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
1455	if (RT_SUCCESS(rc))
1456	{
1457	ISCSIOPCODE cmd;
1458	ISCSILOGINSTATUSCLASS loginStatusClass;
1459
1460	cnISCSIRes = 0;
1461	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1462	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1463	cnISCSIRes++;
1464	aISCSIRes[cnISCSIRes].pvSeg = bBuf;
1465	aISCSIRes[cnISCSIRes].cbSeg = sizeof(bBuf);
1466	cnISCSIRes++;
1467
1468	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes, ISCSIPDU_NO_REATTACH);
1469	if (RT_FAILURE(rc))
1470	{
1471	/*
1472	* We lost connection to the target while receiving the answer,
1473	* start from the beginning.
1474	*/
1475	if (rc == VERR_BROKEN_PIPE \|\| rc == VERR_NET_CONNECTION_REFUSED)
1476	rc = VERR_TRY_AGAIN;
1477	break;
1478	}
1479
1480	/** @todo collect partial login responses with Continue bit set. */
1481	Assert(aISCSIRes[0].pvSeg == aResBHS);
1482	Assert(aISCSIRes[0].cbSeg >= ISCSI_BHS_SIZE);
1483	Assert((RT_N2H_U32(aResBHS[0]) & ISCSI_CONTINUE_BIT) == 0);
1484
1485	cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
1486	if (cmd == ISCSIOP_LOGIN_RES)
1487	{
1488	if ((RT_N2H_U32(aResBHS[0]) & 0xff) != ISCSI_MY_VERSION)
1489	{
1490	iscsiTransportClose(pImage);
1491	rc = VERR_PARSE_ERROR;
1492	break; /* Give up immediately, as a RFC violation in version fields is very serious. */
1493	}
1494
1495	loginStatusClass = (ISCSILOGINSTATUSCLASS)(RT_N2H_U32(aResBHS[9]) >> 24);
1496	switch (loginStatusClass)
1497	{
1498	case ISCSI_LOGIN_STATUS_CLASS_SUCCESS:
1499	uint32_t targetCSG;
1500	uint32_t targetNSG;
1501	bool targetTransit;
1502
1503	if (pImage->FirstRecvPDU)
1504	{
1505	pImage->FirstRecvPDU = false;
1506	pImage->ExpStatSN = RT_N2H_U32(aResBHS[6]) + 1;
1507	}
1508
1509	targetCSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_CSG_MASK) >> ISCSI_CSG_SHIFT;
1510	targetNSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_NSG_MASK) >> ISCSI_NSG_SHIFT;
1511	targetTransit = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_TRANSIT_BIT);
1512
1513	/* Handle all cases with a single switch statement. */
1514	switch (csg << 8 \| substate)
1515	{
1516	case 0x0000: /* security negotiation, step 0: receive final authentication. */
1517	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1518	if (RT_FAILURE(rc))
1519	break;
1520
1521	const char *pcszAuthMethod;
1522
1523	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "AuthMethod", &pcszAuthMethod);
1524	if (RT_FAILURE(rc))
1525	{
1526	rc = VERR_PARSE_ERROR;
1527	break;
1528	}
1529	if (strcmp(pcszAuthMethod, "None") == 0)
1530	{
1531	/* Authentication offered, but none required. Skip to operational parameters. */
1532	csg = 1;
1533	nsg = 1;
1534	transit = true;
1535	substate = 0;
1536	break;
1537	}
1538	else if (strcmp(pcszAuthMethod, "CHAP") == 0 && targetNSG == 0 && !targetTransit)
1539	{
1540	/* CHAP authentication required, continue with next substate. */
1541	substate++;
1542	break;
1543	}
1544
1545	/* Unknown auth method or login response PDU headers incorrect. */
1546	rc = VERR_PARSE_ERROR;
1547	break;
1548	case 0x0001: /* security negotiation, step 1: receive final CHAP variant and challenge. */
1549	{
1550	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1551	if (RT_FAILURE(rc))
1552	break;
1553
1554	const char *pcszChapAuthMethod;
1555	const char *pcszChapIdxTarget;
1556	const char *pcszChapChallengeStr;
1557
1558	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_A", &pcszChapAuthMethod);
1559	if (RT_FAILURE(rc))
1560	{
1561	rc = VERR_PARSE_ERROR;
1562	break;
1563	}
1564	if (strcmp(pcszChapAuthMethod, "5") != 0)
1565	{
1566	rc = VERR_PARSE_ERROR;
1567	break;
1568	}
1569	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_I", &pcszChapIdxTarget);
1570	if (RT_FAILURE(rc))
1571	{
1572	rc = VERR_PARSE_ERROR;
1573	break;
1574	}
1575	rc = RTStrToUInt8Ex(pcszChapIdxTarget, &pszNext, 0, &bChapIdx);
1576	/** @todo r=bird: Unsafe use of pszNext on failure. The code should probably
1577	* use RTStrToUInt8Full and check for rc != VINF_SUCCESS. */
1578	if (rc > VINF_SUCCESS \|\| *pszNext != '\0')
1579	{
1580	rc = VERR_PARSE_ERROR;
1581	break;
1582	}
1583	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_C", &pcszChapChallengeStr);
1584	if (RT_FAILURE(rc))
1585	{
1586	rc = VERR_PARSE_ERROR;
1587	break;
1588	}
1589	cbChallenge = sizeof(pbChallenge);
1590	rc = iscsiStrToBinary(pcszChapChallengeStr, pbChallenge, &cbChallenge);
1591	if (RT_FAILURE(rc))
1592	break;
1593	substate++;
1594	transit = true;
1595	break;
1596	}
1597	case 0x0002: /* security negotiation, step 2: check authentication success. */
1598	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1599	if (RT_FAILURE(rc))
1600	break;
1601
1602	if (targetCSG == 0 && targetNSG == 1 && targetTransit)
1603	{
1604	/* Target wants to continue in login operational state, authentication success. */
1605	csg = 1;
1606	nsg = 3;
1607	substate = 0;
1608	break;
1609	}
1610	rc = VERR_PARSE_ERROR;
1611	break;
1612	case 0x0100: /* login operational negotiation, step 0: check results. */
1613	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1614	if (RT_FAILURE(rc))
1615	break;
1616
1617	if (targetCSG == 1 && targetNSG == 3 && targetTransit)
1618	{
1619	/* Target wants to continue in full feature phase, login finished. */
1620	csg = 3;
1621	nsg = 3;
1622	substate = 0;
1623	break;
1624	}
1625	else if (targetCSG == 1 && (targetNSG == 1 \|\| !targetTransit))
1626	{
1627	/* Target wants to negotiate certain parameters and
1628	* stay in login operational negotiation. */
1629	csg = 1;
1630	nsg = 3;
1631	substate = 0;
1632	break;
1633	}
1634	rc = VERR_PARSE_ERROR;
1635	break;
1636	case 0x0300: /* full feature phase. */
1637	default:
1638	AssertMsgFailed(("recv: Undefined login state %d substate %d\n", csg, substate));
1639	rc = VERR_PARSE_ERROR;
1640	break;
1641	}
1642	break;
1643	case ISCSI_LOGIN_STATUS_CLASS_REDIRECTION:
1644	const char *pcszTargetRedir;
1645
1646	/* Target has moved to some other location, as indicated in the TargetAddress key. */
1647	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "TargetAddress", &pcszTargetRedir);
1648	if (RT_FAILURE(rc))
1649	{
1650	rc = VERR_PARSE_ERROR;
1651	break;
1652	}
1653	if (pImage->pszTargetAddress)
1654	RTMemFree(pImage->pszTargetAddress);
1655	{
1656	size_t cb = strlen(pcszTargetRedir) + 1;
1657	pImage->pszTargetAddress = (char *)RTMemAlloc(cb);
1658	if (!pImage->pszTargetAddress)
1659	{
1660	rc = VERR_NO_MEMORY;
1661	break;
1662	}
1663	memcpy(pImage->pszTargetAddress, pcszTargetRedir, cb);
1664	}
1665	rc = VINF_TRY_AGAIN;
1666	break;
1667	case ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR:
1668	{
1669	LogRel(("iSCSI: login to target failed with: %s\n",
1670	iscsiGetLoginErrorDetail((RT_N2H_U32(aResBHS[9]) >> 16) & 0xff)));
1671	iscsiTransportClose(pImage);
1672	rc = VERR_IO_GEN_FAILURE;
1673	break;
1674	}
1675	case ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR:
1676	iscsiTransportClose(pImage);
1677	rc = VINF_EOF;
1678	break;
1679	default:
1680	rc = VERR_PARSE_ERROR;
1681	}
1682
1683	if (RT_FAILURE(rc) \|\| rc == VINF_TRY_AGAIN)
1684	break;
1685
1686	if (csg == 3)
1687	{
1688	/*
1689	* Finished login, continuing with Full Feature Phase.
1690	*/
1691	rc = VINF_SUCCESS;
1692	break;
1693	}
1694	}
1695	else
1696	AssertMsgFailed(("%s: ignoring unexpected PDU with first word = %#08x\n", __FUNCTION__, RT_N2H_U32(aResBHS[0])));
1697	}
1698	else
1699	break;
1700	} while (true);
1701
1702	if ( RT_FAILURE(rc)
1703	&& rc != VERR_TRY_AGAIN)
1704	{
1705	/*
1706	* Dump the last request and response of we are supposed to do so and there is a request
1707	* or response.
1708	*/
1709	if (cnISCSIReq)
1710	iscsiDumpPacket(pImage, aISCSIReq, cnISCSIReq, VINF_SUCCESS, true /* fRequest */);
1711
1712	if (cnISCSIRes)
1713	iscsiDumpPacket(pImage, (PISCSIREQ)aISCSIRes, cnISCSIRes, rc, false /* fRequest */);
1714
1715	/*
1716	* Close connection to target.
1717	*/
1718	iscsiTransportClose(pImage);
1719	pImage->state = ISCSISTATE_FREE;
1720	}
1721	else if (rc == VINF_SUCCESS)
1722	pImage->state = ISCSISTATE_NORMAL;
1723
1724	return rc;
1725	}
1726
1727	/**
1728	* Attach to an iSCSI target. Performs all operations necessary to enter
1729	* Full Feature Phase.
1730	*
1731	* @returns VBox status code.
1732	* @param pvUser The iSCSI connection state to be used as opaque user data.
1733	*/
1734	static DECLCALLBACK(int) iscsiAttach(void *pvUser)
1735	{
1736	int rc = VINF_SUCCESS;
1737	unsigned cRetries = 5;
1738	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
1739
1740	LogFlowFunc(("entering\n"));
1741
1742	Assert(pImage->state == ISCSISTATE_FREE);
1743
1744	/*
1745	* If there were too many logins without any successful I/O just fail
1746	* and assume the target is not working properly.
1747	*/
1748	if (ASMAtomicReadU32(&pImage->cLoginsSinceIo) == 3)
1749	return VERR_BROKEN_PIPE;
1750
1751	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1752
1753	/* Make 100% sure the connection isn't reused for a new login. */
1754	iscsiTransportClose(pImage);
1755
1756	/* Try to log in a few number of times. */
1757	while (cRetries > 0)
1758	{
1759	rc = iscsiLogin(pImage);
1760	if (rc == VINF_SUCCESS) /* Login succeeded, continue with full feature phase. */
1761	break;
1762	else if (rc == VERR_TRY_AGAIN) /* Lost connection during receive. */
1763	cRetries--;
1764	else if (RT_FAILURE(rc))
1765	break;
1766	else /* For redirects try again. */
1767	AssertMsg(rc == VINF_TRY_AGAIN, ("Unexpected status code %Rrc\n", rc));
1768	}
1769
1770	if (RT_SUCCESS(rc))
1771	ASMAtomicIncU32(&pImage->cLoginsSinceIo);
1772
1773	RTSemMutexRelease(pImage->Mutex);
1774
1775	LogFlowFunc(("returning %Rrc\n", rc));
1776	LogRel(("iSCSI: login to target %s %s (%Rrc)\n", pImage->pszTargetName, RT_SUCCESS(rc) ? "successful" : "failed", rc));
1777	return rc;
1778	}
1779
1780
1781	/**
1782	* Detach from an iSCSI target.
1783	*
1784	* @returns VBox status code.
1785	* @param pvUser The iSCSI connection state to be used as opaque user data.
1786	*/
1787	static DECLCALLBACK(int) iscsiDetach(void *pvUser)
1788	{
1789	int rc;
1790	uint32_t itt;
1791	uint32_t cnISCSIReq = 0;
1792	ISCSIREQ aISCSIReq[4];
1793	uint32_t aReqBHS[12];
1794	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
1795
1796	LogFlowFunc(("entering\n"));
1797
1798	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1799
1800	if (pImage->state != ISCSISTATE_FREE && pImage->state != ISCSISTATE_IN_LOGOUT)
1801	{
1802	pImage->state = ISCSISTATE_IN_LOGOUT;
1803
1804	/*
1805	* Send logout request to target.
1806	*/
1807	itt = iscsiNewITT(pImage);
1808	aReqBHS[0] = RT_H2N_U32(ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_REQ); /* I=0,F=1,Reason=close session */
1809	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
1810	aReqBHS[2] = 0; /* reserved */
1811	aReqBHS[3] = 0; /* reserved */
1812	aReqBHS[4] = itt;
1813	aReqBHS[5] = 0; /* reserved */
1814	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1815	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1816	aReqBHS[8] = 0; /* reserved */
1817	aReqBHS[9] = 0; /* reserved */
1818	aReqBHS[10] = 0; /* reserved */
1819	aReqBHS[11] = 0; /* reserved */
1820	pImage->CmdSN++;
1821
1822	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1823	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1824	cnISCSIReq++;
1825
1826	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
1827	if (RT_SUCCESS(rc))
1828	{
1829	/*
1830	* Read logout response from target.
1831	*/
1832	ISCSIRES aISCSIRes;
1833	uint32_t aResBHS[12];
1834
1835	aISCSIRes.pvSeg = aResBHS;
1836	aISCSIRes.cbSeg = sizeof(aResBHS);
1837	rc = iscsiRecvPDU(pImage, itt, &aISCSIRes, 1, ISCSIPDU_NO_REATTACH);
1838	if (RT_SUCCESS(rc))
1839	{
1840	if (RT_N2H_U32(aResBHS[0]) != (ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_RES))
1841	AssertMsgFailed(("iSCSI Logout response invalid\n"));
1842	}
1843	else
1844	AssertMsgFailed(("iSCSI Logout response error, rc=%Rrc\n", rc));
1845	}
1846	else
1847	AssertMsgFailed(("Could not send iSCSI Logout request, rc=%Rrc\n", rc));
1848	}
1849
1850	if (pImage->state != ISCSISTATE_FREE)
1851	{
1852	/*
1853	* Close connection to target.
1854	*/
1855	rc = iscsiTransportClose(pImage);
1856	if (RT_FAILURE(rc))
1857	AssertMsgFailed(("Could not close connection to target, rc=%Rrc\n", rc));
1858	}
1859
1860	pImage->state = ISCSISTATE_FREE;
1861
1862	RTSemMutexRelease(pImage->Mutex);
1863
1864	LogFlowFunc(("leaving\n"));
1865	LogRel(("iSCSI: logout to target %s\n", pImage->pszTargetName));
1866	return VINF_SUCCESS;
1867	}
1868
1869
1870	/**
1871	* Perform a command on an iSCSI target. Target must be already in
1872	* Full Feature Phase.
1873	*
1874	* @returns VBox status code.
1875	* @param pImage The iSCSI connection state to be used.
1876	* @param pRequest Command descriptor. Contains all information about
1877	* the command, its transfer directions and pointers
1878	* to the buffer(s) used for transferring data and
1879	* status information.
1880	*/
1881	static int iscsiCommand(PISCSIIMAGE pImage, PSCSIREQ pRequest)
1882	{
1883	int rc;
1884	uint32_t itt;
1885	uint32_t cbData;
1886	uint32_t cnISCSIReq = 0;
1887	ISCSIREQ aISCSIReq[4];
1888	uint32_t aReqBHS[12];
1889
1890	uint32_t *pDst = NULL;
1891	size_t cbBufLength;
1892	uint32_t aStatus[256]; /*< Plenty of buffer for status information. /
1893	uint32_t ExpDataSN = 0;
1894	bool final = false;
1895
1896
1897	LogFlowFunc(("entering, CmdSN=%d\n", pImage->CmdSN));
1898
1899	Assert(pRequest->enmXfer != SCSIXFER_TO_FROM_TARGET); /*< @todo not yet supported, would require AHS. /
1900	Assert(pRequest->cbI2TData <= 0xffffff); /* larger transfers would require R2T support. */
1901	Assert(pRequest->cbCDB <= 16); /* would cause buffer overrun below. */
1902
1903	/* If not in normal state, then the transport connection was dropped. Try
1904	* to reestablish by logging in, the target might be responsive again. */
1905	if (pImage->state == ISCSISTATE_FREE)
1906	rc = iscsiAttach(pImage);
1907
1908	/* If still not in normal state, then the underlying transport connection
1909	* cannot be established. Get out before bad things happen (and make
1910	* sure the caller suspends the VM again). */
1911	if (pImage->state == ISCSISTATE_NORMAL)
1912	{
1913	/*
1914	* Send SCSI command to target with all I2T data included.
1915	*/
1916	cbData = 0;
1917	if (pRequest->enmXfer == SCSIXFER_FROM_TARGET)
1918	cbData = (uint32_t)pRequest->cbT2IData;
1919	else
1920	cbData = (uint32_t)pRequest->cbI2TData;
1921
1922	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1923
1924	itt = iscsiNewITT(pImage);
1925	memset(aReqBHS, 0, sizeof(aReqBHS));
1926	aReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_SIMPLE \| ISCSIOP_SCSI_CMD
1927	\| (pRequest->enmXfer << 21)); /* I=0,F=1,Attr=Simple */
1928	aReqBHS[1] = RT_H2N_U32(0x00000000 \| ((uint32_t)pRequest->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
1929	aReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
1930	aReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
1931	aReqBHS[4] = itt;
1932	aReqBHS[5] = RT_H2N_U32(cbData);
1933	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1934	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1935	memcpy(aReqBHS + 8, pRequest->abCDB, pRequest->cbCDB);
1936	pImage->CmdSN++;
1937
1938	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1939	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1940	cnISCSIReq++;
1941
1942	if ( pRequest->enmXfer == SCSIXFER_TO_TARGET
1943	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1944	{
1945	Assert(pRequest->cI2TSegs == 1);
1946	aISCSIReq[cnISCSIReq].pcvSeg = pRequest->paI2TSegs[0].pvSeg;
1947	aISCSIReq[cnISCSIReq].cbSeg = pRequest->paI2TSegs[0].cbSeg; /* Padding done by transport. */
1948	cnISCSIReq++;
1949	}
1950
1951	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_DEFAULT);
1952	if (RT_SUCCESS(rc))
1953	{
1954	/* Place SCSI request in queue. */
1955	pImage->paCurrReq = aISCSIReq;
1956	pImage->cnCurrReq = cnISCSIReq;
1957
1958	/*
1959	* Read SCSI response/data in PDUs from target.
1960	*/
1961	if ( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1962	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1963	{
1964	Assert(pRequest->cT2ISegs == 1);
1965	pDst = (uint32_t *)pRequest->paT2ISegs[0].pvSeg;
1966	cbBufLength = pRequest->paT2ISegs[0].cbSeg;
1967	}
1968	else
1969	cbBufLength = 0;
1970
1971	do
1972	{
1973	uint32_t cnISCSIRes = 0;
1974	ISCSIRES aISCSIRes[4];
1975	uint32_t aResBHS[12];
1976
1977	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1978	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1979	cnISCSIRes++;
1980	if (cbBufLength != 0 &&
1981	( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1982	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET))
1983	{
1984	aISCSIRes[cnISCSIRes].pvSeg = pDst;
1985	aISCSIRes[cnISCSIRes].cbSeg = cbBufLength;
1986	cnISCSIRes++;
1987	}
1988	/* Always reserve space for the status - it's impossible to tell
1989	* beforehand whether this will be the final PDU or not. */
1990	aISCSIRes[cnISCSIRes].pvSeg = aStatus;
1991	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aStatus);
1992	cnISCSIRes++;
1993
1994	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes, ISCSIPDU_DEFAULT);
1995	if (RT_FAILURE(rc))
1996	break;
1997
1998	final = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_FINAL_BIT);
1999	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
2000	if (cmd == ISCSIOP_SCSI_RES)
2001	{
2002	/* This is the final PDU which delivers the status (and may be omitted if
2003	* the last Data-In PDU included successful completion status). Note
2004	* that ExpStatSN has been bumped already in iscsiRecvPDU. */
2005	if (!final \|\| ((RT_N2H_U32(aResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(aResBHS[6]) != pImage->ExpStatSN - 1))
2006	{
2007	/* SCSI Response in the wrong place or with a (target) failure. */
2008	rc = VERR_PARSE_ERROR;
2009	break;
2010	}
2011	/* The following is a bit tricky, as in error situations we may
2012	* get the status only instead of the result data plus optional
2013	* status. Thus the status may have ended up partially in the
2014	* data area. */
2015	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
2016	cbData = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
2017	if (cbData >= 2)
2018	{
2019	uint32_t cbStat = RT_N2H_U32(((uint32_t *)aISCSIRes[1].pvSeg)[0]) >> 16;
2020	if (cbStat + 2 > cbData)
2021	{
2022	rc = VERR_BUFFER_OVERFLOW;
2023	break;
2024	}
2025	/* Truncate sense data if it doesn't fit into the buffer. */
2026	pRequest->cbSense = RT_MIN(cbStat, pRequest->cbSense);
2027	memcpy(pRequest->abSense,
2028	((const char *)aISCSIRes[1].pvSeg) + 2,
2029	RT_MIN(aISCSIRes[1].cbSeg - 2, pRequest->cbSense));
2030	if ( cnISCSIRes > 2 && aISCSIRes[2].cbSeg
2031	&& (ssize_t)pRequest->cbSense - aISCSIRes[1].cbSeg + 2 > 0)
2032	{
2033	memcpy((char *)pRequest->abSense + aISCSIRes[1].cbSeg - 2,
2034	aISCSIRes[2].pvSeg,
2035	pRequest->cbSense - aISCSIRes[1].cbSeg + 2);
2036	}
2037	}
2038	else if (cbData == 1)
2039	{
2040	rc = VERR_PARSE_ERROR;
2041	break;
2042	}
2043	else
2044	pRequest->cbSense = 0;
2045	break;
2046	}
2047	else if (cmd == ISCSIOP_SCSI_DATA_IN)
2048	{
2049	/* A Data-In PDU carries some data that needs to be added to the received
2050	* data in response to the command. There may be both partial and complete
2051	* Data-In PDUs, so collect data until the status is included or the status
2052	* is sent in a separate SCSI Result frame (see above). */
2053	if (final && aISCSIRes[2].cbSeg != 0)
2054	{
2055	/* The received PDU is partially stored in the buffer for status.
2056	* Must not happen under normal circumstances and is a target error. */
2057	rc = VERR_BUFFER_OVERFLOW;
2058	break;
2059	}
2060	uint32_t len = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
2061	pDst = (uint32_t )((char )pDst + len);
2062	cbBufLength -= len;
2063	ExpDataSN++;
2064	if (final && (RT_N2H_U32(aResBHS[0]) & ISCSI_STATUS_BIT) != 0)
2065	{
2066	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
2067	pRequest->cbSense = 0;
2068	break;
2069	}
2070	}
2071	else
2072	{
2073	rc = VERR_PARSE_ERROR;
2074	break;
2075	}
2076	} while (true);
2077
2078	/* Remove SCSI request from queue. */
2079	pImage->paCurrReq = NULL;
2080	pImage->cnCurrReq = 0;
2081	}
2082
2083	if (rc == VERR_TIMEOUT)
2084	{
2085	/* Drop connection in case the target plays dead. Much better than
2086	* delaying the next requests until the timed out command actually
2087	* finishes. Also keep in mind that command shouldn't take longer than
2088	* about 30-40 seconds, or the guest will lose its patience. */
2089	iscsiTransportClose(pImage);
2090	pImage->state = ISCSISTATE_FREE;
2091	rc = VERR_BROKEN_PIPE;
2092	}
2093	RTSemMutexRelease(pImage->Mutex);
2094	}
2095	else
2096	rc = VERR_NET_CONNECTION_REFUSED;
2097
2098	if (RT_SUCCESS(rc))
2099	ASMAtomicWriteU32(&pImage->cLoginsSinceIo, 0);
2100	LogFlowFunc(("returns %Rrc\n", rc));
2101	return rc;
2102	}
2103
2104
2105	/**
2106	* Generate a new Initiator Task Tag.
2107	*
2108	* @returns Initiator Task Tag.
2109	* @param pImage The iSCSI connection state to be used.
2110	*/
2111	static uint32_t iscsiNewITT(PISCSIIMAGE pImage)
2112	{
2113	uint32_t next_itt;
2114
2115	next_itt = pImage->ITT++;
2116	if (pImage->ITT == ISCSI_TASK_TAG_RSVD)
2117	pImage->ITT = 0;
2118	return RT_H2N_U32(next_itt);
2119	}
2120
2121
2122	/**
2123	* Send an iSCSI request. The request can consist of several segments, which
2124	* are padded to 4 byte boundaries and concatenated.
2125	*
2126	* @returns VBOX status
2127	* @param pImage The iSCSI connection state to be used.
2128	* @param paReq Pointer to array of iSCSI request sections.
2129	* @param cnReq Number of valid iSCSI request sections in the array.
2130	* @param uFlags Flags controlling the exact send semantics.
2131	*/
2132	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq,
2133	uint32_t uFlags)
2134	{
2135	int rc = VINF_SUCCESS;
2136	/** @todo return VERR_VD_ISCSI_INVALID_STATE in the appropriate situations,
2137	* needs cleaning up of timeout/disconnect handling a bit, as otherwise
2138	* too many incorrect errors are signalled. */
2139	Assert(cnReq >= 1);
2140	Assert(paReq[0].cbSeg >= ISCSI_BHS_SIZE);
2141
2142	for (uint32_t i = 0; i < pImage->cISCSIRetries; i++)
2143	{
2144	rc = iscsiTransportWrite(pImage, paReq, cnReq);
2145	if (RT_SUCCESS(rc))
2146	break;
2147	if ( (uFlags & ISCSIPDU_NO_REATTACH)
2148	\|\| (rc != VERR_BROKEN_PIPE && rc != VERR_NET_CONNECTION_REFUSED))
2149	break;
2150	/* No point in reestablishing the connection for a logout */
2151	if (pImage->state == ISCSISTATE_IN_LOGOUT)
2152	break;
2153	RTThreadSleep(500);
2154	if (pImage->state != ISCSISTATE_IN_LOGIN)
2155	{
2156	/* Attempt to re-login when a connection fails, but only when not
2157	* currently logging in. */
2158	rc = iscsiAttach(pImage);
2159	if (RT_FAILURE(rc))
2160	break;
2161	}
2162	}
2163	return rc;
2164	}
2165
2166
2167	/**
2168	* Wait for an iSCSI response with a matching Initiator Target Tag. The response is
2169	* split into several segments, as requested by the caller-provided buffer specification.
2170	* Remember that the response can be split into several PDUs by the sender, so make
2171	* sure that all parts are collected and processed appropriately by the caller.
2172	*
2173	* @returns VBOX status
2174	* @param pImage The iSCSI connection state to be used.
2175	* @param itt The initiator task tag.
2176	* @param paRes Pointer to array of iSCSI response sections.
2177	* @param cnRes Number of valid iSCSI response sections in the array.
2178	* @param fRecvFlags PDU receive flags.
2179	*/
2180	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes,
2181	uint32_t fRecvFlags)
2182	{
2183	int rc = VINF_SUCCESS;
2184	ISCSIRES aResBuf;
2185
2186	for (uint32_t i = 0; i < pImage->cISCSIRetries; i++)
2187	{
2188	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
2189	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
2190	rc = iscsiTransportRead(pImage, &aResBuf, 1);
2191	if (RT_FAILURE(rc))
2192	{
2193	if (rc == VERR_BROKEN_PIPE \|\| rc == VERR_NET_CONNECTION_REFUSED)
2194	{
2195	/* No point in reestablishing the connection for a logout */
2196	if (pImage->state == ISCSISTATE_IN_LOGOUT)
2197	break;
2198	/* Connection broken while waiting for a response - wait a while and
2199	* try to restart by re-sending the original request (if any).
2200	* This also handles the connection reestablishment (login etc.). */
2201	RTThreadSleep(500);
2202	if ( pImage->state != ISCSISTATE_IN_LOGIN
2203	&& !(fRecvFlags & ISCSIPDU_NO_REATTACH))
2204	{
2205	/* Attempt to re-login when a connection fails, but only when not
2206	* currently logging in. */
2207	rc = iscsiAttach(pImage);
2208	if (RT_FAILURE(rc))
2209	break;
2210
2211	if (pImage->paCurrReq != NULL)
2212	{
2213	rc = iscsiSendPDU(pImage, pImage->paCurrReq, pImage->cnCurrReq, ISCSIPDU_DEFAULT);
2214	if (RT_FAILURE(rc))
2215	break;
2216	}
2217	}
2218	}
2219	else
2220	{
2221	/* Signal other errors (VERR_BUFFER_OVERFLOW etc.) to the caller. */
2222	break;
2223	}
2224	}
2225	else
2226	{
2227	ISCSIOPCODE cmd;
2228	const uint32_t pcvResSeg = (const uint32_t )aResBuf.pvSeg;
2229
2230	/* Check whether the received PDU is valid, and update the internal state of
2231	* the iSCSI connection/session. */
2232	rc = iscsiValidatePDU(&aResBuf, 1);
2233	if (RT_FAILURE(rc))
2234	{
2235	iscsiDumpPacket(pImage, (PISCSIREQ)&aResBuf, 1, rc, false /* fRequest */);
2236	continue;
2237	}
2238	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
2239	switch (cmd)
2240	{
2241	case ISCSIOP_SCSI_RES:
2242	case ISCSIOP_SCSI_TASKMGMT_RES:
2243	case ISCSIOP_SCSI_DATA_IN:
2244	case ISCSIOP_R2T:
2245	case ISCSIOP_ASYN_MSG:
2246	case ISCSIOP_TEXT_RES:
2247	case ISCSIOP_LOGIN_RES:
2248	case ISCSIOP_LOGOUT_RES:
2249	case ISCSIOP_REJECT:
2250	case ISCSIOP_NOP_IN:
2251	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
2252	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
2253	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
2254	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
2255	break;
2256	default:
2257	rc = VERR_PARSE_ERROR;
2258	iscsiDumpPacket(pImage, (PISCSIREQ)&aResBuf, 1, rc, false /* fRequest */);
2259	}
2260	if (RT_FAILURE(rc))
2261	continue;
2262	if ( !pImage->FirstRecvPDU
2263	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT))
2264	&& ( cmd != ISCSIOP_LOGIN_RES
2265	\|\| (ISCSILOGINSTATUSCLASS)((RT_N2H_U32(pcvResSeg[9]) >> 24) == ISCSI_LOGIN_STATUS_CLASS_SUCCESS)))
2266	{
2267	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
2268	{
2269	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
2270	if ( (cmd != ISCSIOP_R2T)
2271	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
2272	pImage->ExpStatSN++;
2273	}
2274	else
2275	{
2276	rc = VERR_PARSE_ERROR;
2277	iscsiDumpPacket(pImage, (PISCSIREQ)&aResBuf, 1, rc, false /* fRequest */);
2278	continue;
2279	}
2280	}
2281	/* Finally check whether the received PDU matches what the caller wants. */
2282	if ( itt == pcvResSeg[4]
2283	&& itt != ISCSI_TASK_TAG_RSVD)
2284	{
2285	/* Copy received PDU (one segment) to caller-provided buffers. */
2286	uint32_t j;
2287	size_t cbSeg;
2288	const uint8_t *pSrc;
2289
2290	pSrc = (const uint8_t *)aResBuf.pvSeg;
2291	cbSeg = aResBuf.cbSeg;
2292	for (j = 0; j < cnRes; j++)
2293	{
2294	if (cbSeg > paRes[j].cbSeg)
2295	{
2296	memcpy(paRes[j].pvSeg, pSrc, paRes[j].cbSeg);
2297	pSrc += paRes[j].cbSeg;
2298	cbSeg -= paRes[j].cbSeg;
2299	}
2300	else
2301	{
2302	memcpy(paRes[j].pvSeg, pSrc, cbSeg);
2303	paRes[j].cbSeg = cbSeg;
2304	cbSeg = 0;
2305	break;
2306	}
2307	}
2308	if (cbSeg != 0)
2309	{
2310	rc = VERR_BUFFER_OVERFLOW;
2311	break;
2312	}
2313	for (j++; j < cnRes; j++)
2314	paRes[j].cbSeg = 0;
2315	break;
2316	}
2317	else if ( cmd == ISCSIOP_NOP_IN
2318	&& RT_N2H_U32(pcvResSeg[5]) != ISCSI_TASK_TAG_RSVD)
2319	{
2320	uint32_t cnISCSIReq;
2321	ISCSIREQ aISCSIReq[4];
2322	uint32_t aReqBHS[12];
2323
2324	aReqBHS[0] = RT_H2N_U32(ISCSI_IMMEDIATE_DELIVERY_BIT \| ISCSI_FINAL_BIT \| ISCSIOP_NOP_OUT);
2325	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
2326	aReqBHS[2] = pcvResSeg[2]; /* copy LUN from NOP-In */
2327	aReqBHS[3] = pcvResSeg[3]; /* copy LUN from NOP-In */
2328	aReqBHS[4] = RT_H2N_U32(ISCSI_TASK_TAG_RSVD); /* ITT, reply */
2329	aReqBHS[5] = pcvResSeg[5]; /* copy TTT from NOP-In */
2330	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2331	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2332	aReqBHS[8] = 0; /* reserved */
2333	aReqBHS[9] = 0; /* reserved */
2334	aReqBHS[10] = 0; /* reserved */
2335	aReqBHS[11] = 0; /* reserved */
2336
2337	cnISCSIReq = 0;
2338	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
2339	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
2340	cnISCSIReq++;
2341
2342	iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
2343	/* Break if the caller wanted to process the NOP-in only. */
2344	if (itt == ISCSI_TASK_TAG_RSVD)
2345	break;
2346	}
2347	}
2348	}
2349
2350	LogFlowFunc(("returns rc=%Rrc\n", rc));
2351	return rc;
2352	}
2353
2354
2355	/**
2356	* Reset the PDU buffer
2357	*
2358	* @param pImage The iSCSI connection state to be used.
2359	*/
2360	static void iscsiRecvPDUReset(PISCSIIMAGE pImage)
2361	{
2362	pImage->cbRecvPDUResidual = ISCSI_BHS_SIZE;
2363	pImage->fRecvPDUBHS = true;
2364	pImage->pbRecvPDUBufCur = (uint8_t *)pImage->pvRecvPDUBuf;
2365	}
2366
2367	static void iscsiPDUTxAdd(PISCSIIMAGE pImage, PISCSIPDUTX pIScsiPDUTx, bool fFront)
2368	{
2369	if (!fFront)
2370	{
2371	/* Insert PDU at the tail of the list. */
2372	if (!pImage->pIScsiPDUTxHead)
2373	pImage->pIScsiPDUTxHead = pIScsiPDUTx;
2374	else
2375	pImage->pIScsiPDUTxTail->pNext = pIScsiPDUTx;
2376	pImage->pIScsiPDUTxTail = pIScsiPDUTx;
2377	}
2378	else
2379	{
2380	/* Insert PDU at the beginning of the list. */
2381	pIScsiPDUTx->pNext = pImage->pIScsiPDUTxHead;
2382	pImage->pIScsiPDUTxHead = pIScsiPDUTx;
2383	if (!pImage->pIScsiPDUTxTail)
2384	pImage->pIScsiPDUTxTail = pIScsiPDUTx;
2385	}
2386	}
2387
2388	/**
2389	* Receives a PDU in a non blocking way.
2390	*
2391	* @returns VBOX status code.
2392	* @param pImage The iSCSI connection state to be used.
2393	*/
2394	static int iscsiRecvPDUAsync(PISCSIIMAGE pImage)
2395	{
2396	size_t cbActuallyRead = 0;
2397	int rc = VINF_SUCCESS;
2398
2399	LogFlowFunc(("pImage=%#p\n", pImage));
2400
2401	/* Check if we are in the middle of a PDU receive. */
2402	if (pImage->cbRecvPDUResidual == 0)
2403	{
2404	/*
2405	* We are receiving a new PDU, don't read more than the BHS initially
2406	* until we know the real size of the PDU.
2407	*/
2408	iscsiRecvPDUReset(pImage);
2409	LogFlow(("Receiving new PDU\n"));
2410	}
2411
2412	rc = pImage->pIfNet->pfnReadNB(pImage->Socket, pImage->pbRecvPDUBufCur,
2413	pImage->cbRecvPDUResidual, &cbActuallyRead);
2414	if (RT_SUCCESS(rc) && cbActuallyRead == 0)
2415	rc = VERR_BROKEN_PIPE;
2416
2417	if (RT_SUCCESS(rc))
2418	{
2419	LogFlow(("Received %zu bytes\n", cbActuallyRead));
2420	pImage->cbRecvPDUResidual -= cbActuallyRead;
2421	pImage->pbRecvPDUBufCur += cbActuallyRead;
2422
2423	/* Check if we received everything we wanted. */
2424	if ( !pImage->cbRecvPDUResidual
2425	&& pImage->fRecvPDUBHS)
2426	{
2427	size_t cbAHSLength, cbDataLength;
2428
2429	/* If we were reading the BHS first get the actual PDU size now. */
2430	uint32_t word1 = RT_N2H_U32(((uint32_t *)(pImage->pvRecvPDUBuf))[1]);
2431	cbAHSLength = (word1 & 0xff000000) >> 24;
2432	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
2433	cbDataLength = word1 & 0x00ffffff;
2434	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
2435	pImage->cbRecvPDUResidual = cbAHSLength + cbDataLength;
2436	pImage->fRecvPDUBHS = false; /* Start receiving the rest of the PDU. */
2437	}
2438
2439	if (!pImage->cbRecvPDUResidual)
2440	{
2441	/* We received the complete PDU with or without any payload now. */
2442	LogFlow(("Received complete PDU\n"));
2443	ISCSIRES aResBuf;
2444	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
2445	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
2446	rc = iscsiRecvPDUProcess(pImage, &aResBuf, 1);
2447	}
2448	}
2449	else
2450	LogFlowFunc(("Reading from the socket returned with rc=%Rrc\n", rc));
2451
2452	return rc;
2453	}
2454
2455	static int iscsiSendPDUAsync(PISCSIIMAGE pImage)
2456	{
2457	size_t cbSent = 0;
2458	int rc = VINF_SUCCESS;
2459
2460	LogFlowFunc(("pImage=%#p\n", pImage));
2461
2462	do
2463	{
2464	/*
2465	* If there is no PDU active, get the first one from the list.
2466	* Check that we are allowed to transfer the PDU by comparing the
2467	* command sequence number and the maximum sequence number allowed by the target.
2468	*/
2469	if (!pImage->pIScsiPDUTxCur)
2470	{
2471	if ( !pImage->pIScsiPDUTxHead
2472	\|\| serial_number_greater(pImage->pIScsiPDUTxHead->CmdSN, pImage->MaxCmdSN))
2473	break;
2474
2475	pImage->pIScsiPDUTxCur = pImage->pIScsiPDUTxHead;
2476	pImage->pIScsiPDUTxHead = pImage->pIScsiPDUTxCur->pNext;
2477	if (!pImage->pIScsiPDUTxHead)
2478	pImage->pIScsiPDUTxTail = NULL;
2479	}
2480
2481	/* Send as much as we can. */
2482	rc = pImage->pIfNet->pfnSgWriteNB(pImage->Socket, &pImage->pIScsiPDUTxCur->SgBuf, &cbSent);
2483	LogFlow(("SgWriteNB returned rc=%Rrc cbSent=%zu\n", rc, cbSent));
2484	if (RT_SUCCESS(rc))
2485	{
2486	LogFlow(("Sent %zu bytes for PDU %#p\n", cbSent, pImage->pIScsiPDUTxCur));
2487	pImage->pIScsiPDUTxCur->cbSgLeft -= cbSent;
2488	RTSgBufAdvance(&pImage->pIScsiPDUTxCur->SgBuf, cbSent);
2489	if (!pImage->pIScsiPDUTxCur->cbSgLeft)
2490	{
2491	/* PDU completed, free it and place the command on the waiting for response list. */
2492	if (pImage->pIScsiPDUTxCur->pIScsiCmd)
2493	{
2494	LogFlow(("Sent complete PDU, placing on waiting list\n"));
2495	iscsiCmdInsert(pImage, pImage->pIScsiPDUTxCur->pIScsiCmd);
2496	}
2497	RTMemFree(pImage->pIScsiPDUTxCur);
2498	pImage->pIScsiPDUTxCur = NULL;
2499	}
2500	}
2501	} while ( RT_SUCCESS(rc)
2502	&& !pImage->pIScsiPDUTxCur);
2503
2504	if (rc == VERR_TRY_AGAIN)
2505	rc = VINF_SUCCESS;
2506
2507	/* Add the write poll flag if we still have something to send, clear it otherwise. */
2508	if (pImage->pIScsiPDUTxCur)
2509	pImage->fPollEvents \|= VD_INTERFACETCPNET_EVT_WRITE;
2510	else
2511	pImage->fPollEvents &= ~VD_INTERFACETCPNET_EVT_WRITE;
2512
2513	LogFlowFunc(("rc=%Rrc pIScsiPDUTxCur=%#p\n", rc, pImage->pIScsiPDUTxCur));
2514	return rc;
2515	}
2516
2517	/**
2518	* Process a received PDU.
2519	*
2520	* @return VBOX status code.
2521	* @param pImage The iSCSI connection state to be used.
2522	* @param paRes Pointer to the array of iSCSI response sections.
2523	* @param cnRes Number of valid iSCSI response sections in the array.
2524	*/
2525	static int iscsiRecvPDUProcess(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes)
2526	{
2527	int rc = VINF_SUCCESS;
2528
2529	LogFlowFunc(("pImage=%#p paRes=%#p cnRes=%u\n", pImage, paRes, cnRes));
2530
2531	/* Validate the PDU first. */
2532	rc = iscsiValidatePDU(paRes, cnRes);
2533	if (RT_SUCCESS(rc))
2534	{
2535	ISCSIOPCODE cmd;
2536	const uint32_t pcvResSeg = (const uint32_t )paRes[0].pvSeg;
2537
2538	Assert(paRes[0].cbSeg > 9 * sizeof(uint32_t));
2539
2540	do
2541	{
2542	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
2543	switch (cmd)
2544	{
2545	case ISCSIOP_SCSI_RES:
2546	case ISCSIOP_SCSI_TASKMGMT_RES:
2547	case ISCSIOP_SCSI_DATA_IN:
2548	case ISCSIOP_R2T:
2549	case ISCSIOP_ASYN_MSG:
2550	case ISCSIOP_TEXT_RES:
2551	case ISCSIOP_LOGIN_RES:
2552	case ISCSIOP_LOGOUT_RES:
2553	case ISCSIOP_REJECT:
2554	case ISCSIOP_NOP_IN:
2555	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
2556	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
2557	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
2558	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
2559	break;
2560	default:
2561	rc = VERR_PARSE_ERROR;
2562	iscsiDumpPacket(pImage, (PISCSIREQ)paRes, cnRes, rc, false /* fRequest */);
2563	}
2564
2565	if (RT_FAILURE(rc))
2566	break;
2567
2568	if ( !pImage->FirstRecvPDU
2569	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT)))
2570	{
2571	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
2572	{
2573	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
2574	if ( (cmd != ISCSIOP_R2T)
2575	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
2576	pImage->ExpStatSN++;
2577	}
2578	else
2579	{
2580	rc = VERR_PARSE_ERROR;
2581	iscsiDumpPacket(pImage, (PISCSIREQ)paRes, cnRes, rc, false /* fRequest */);
2582	break;
2583	}
2584	}
2585
2586	if (pcvResSeg[4] != ISCSI_TASK_TAG_RSVD)
2587	{
2588	/*
2589	* This is a response from the target for a request from the initiator.
2590	* Get the request and update its state.
2591	*/
2592	rc = iscsiRecvPDUUpdateRequest(pImage, paRes, cnRes);
2593	/* Try to send more PDUs now that we updated the MaxCmdSN field */
2594	if ( RT_SUCCESS(rc)
2595	&& !pImage->pIScsiPDUTxCur)
2596	rc = iscsiSendPDUAsync(pImage);
2597	}
2598	else
2599	{
2600	/* This is a target initiated request (we handle only NOP-In request at the moment). */
2601	if ( cmd == ISCSIOP_NOP_IN
2602	&& RT_N2H_U32(pcvResSeg[5]) != ISCSI_TASK_TAG_RSVD)
2603	{
2604	PISCSIPDUTX pIScsiPDUTx;
2605	uint32_t cnISCSIReq;
2606	uint32_t *paReqBHS;
2607
2608	LogFlowFunc(("Sending NOP-Out\n"));
2609
2610	/* Allocate a new PDU initialize it and put onto the waiting list. */
2611	pIScsiPDUTx = (PISCSIPDUTX)RTMemAllocZ(sizeof(ISCSIPDUTX));
2612	if (!pIScsiPDUTx)
2613	{
2614	rc = VERR_NO_MEMORY;
2615	break;
2616	}
2617	paReqBHS = &pIScsiPDUTx->aBHS[0];
2618	paReqBHS[0] = RT_H2N_U32(ISCSI_IMMEDIATE_DELIVERY_BIT \| ISCSI_FINAL_BIT \| ISCSIOP_NOP_OUT);
2619	paReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
2620	paReqBHS[2] = pcvResSeg[2]; /* copy LUN from NOP-In */
2621	paReqBHS[3] = pcvResSeg[3]; /* copy LUN from NOP-In */
2622	paReqBHS[4] = RT_H2N_U32(ISCSI_TASK_TAG_RSVD); /* ITT, reply */
2623	paReqBHS[5] = pcvResSeg[5]; /* copy TTT from NOP-In */
2624	paReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2625	paReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2626	paReqBHS[8] = 0; /* reserved */
2627	paReqBHS[9] = 0; /* reserved */
2628	paReqBHS[10] = 0; /* reserved */
2629	paReqBHS[11] = 0; /* reserved */
2630
2631	cnISCSIReq = 0;
2632	pIScsiPDUTx->aISCSIReq[cnISCSIReq].pvSeg = paReqBHS;
2633	pIScsiPDUTx->aISCSIReq[cnISCSIReq].cbSeg = sizeof(pIScsiPDUTx->aBHS);
2634	cnISCSIReq++;
2635	pIScsiPDUTx->cbSgLeft = sizeof(pIScsiPDUTx->aBHS);
2636	RTSgBufInit(&pIScsiPDUTx->SgBuf, pIScsiPDUTx->aISCSIReq, cnISCSIReq);
2637
2638	/*
2639	* Link the PDU to the list.
2640	* Insert at the front of the list to send the response as soon as possible
2641	* to avoid frequent reconnects for a slow connection when there are many PDUs
2642	* waiting.
2643	*/
2644	iscsiPDUTxAdd(pImage, pIScsiPDUTx, true /* fFront */);
2645
2646	/* Start transfer of a PDU if there is no one active at the moment. */
2647	if (!pImage->pIScsiPDUTxCur)
2648	rc = iscsiSendPDUAsync(pImage);
2649	}
2650	}
2651	} while (0);
2652	}
2653	else
2654	iscsiDumpPacket(pImage, (PISCSIREQ)paRes, cnRes, rc, false /* fRequest */);
2655
2656	return rc;
2657	}
2658
2659	/**
2660	* Check the static (not dependent on the connection/session state) validity of an iSCSI response PDU.
2661	*
2662	* @returns VBOX status
2663	* @param paRes Pointer to array of iSCSI response sections.
2664	* @param cnRes Number of valid iSCSI response sections in the array.
2665	*/
2666	static int iscsiValidatePDU(PISCSIRES paRes, uint32_t cnRes)
2667	{
2668	RT_NOREF1(cnRes);
2669	const uint32_t *pcrgResBHS;
2670	uint32_t hw0;
2671	Assert(cnRes >= 1);
2672	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
2673
2674	LogFlowFunc(("paRes=%#p cnRes=%u\n", paRes, cnRes));
2675
2676	pcrgResBHS = (const uint32_t *)(paRes[0].pvSeg);
2677	hw0 = RT_N2H_U32(pcrgResBHS[0]);
2678	switch (hw0 & ISCSIOP_MASK)
2679	{
2680	case ISCSIOP_NOP_IN:
2681	/* NOP-In responses must not be split into several PDUs nor it may contain
2682	* ping data for target-initiated pings nor may both task tags be valid task tags. */
2683	if ( (hw0 & ISCSI_FINAL_BIT) == 0
2684	\|\| ( RT_N2H_U32(pcrgResBHS[4]) == ISCSI_TASK_TAG_RSVD
2685	&& RT_N2H_U32(pcrgResBHS[1]) != 0)
2686	\|\| ( RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD
2687	&& RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD))
2688	return VERR_PARSE_ERROR;
2689	break;
2690	case ISCSIOP_SCSI_RES:
2691	/* SCSI responses must not be split into several PDUs nor must the residual
2692	* bits be contradicting each other nor may the residual bits be set for PDUs
2693	* containing anything else but a completed command response. Underflow
2694	* is no reason for declaring a PDU as invalid, as the target may choose
2695	* to return less data than we assume to get. */
2696	if ( (hw0 & ISCSI_FINAL_BIT) == 0
2697	\|\| ((hw0 & ISCSI_BI_READ_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_BI_READ_RESIDUAL_UNFL_BIT))
2698	\|\| ((hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
2699	\|\| ( ((hw0 & ISCSI_SCSI_RESPONSE_MASK) == 0)
2700	&& ((hw0 & ISCSI_SCSI_STATUS_MASK) == SCSI_STATUS_OK)
2701	&& (hw0 & ( ISCSI_BI_READ_RESIDUAL_OVFL_BIT \| ISCSI_BI_READ_RESIDUAL_UNFL_BIT
2702	\| ISCSI_RESIDUAL_OVFL_BIT))))
2703	return VERR_PARSE_ERROR;
2704	else
2705	LogFlowFunc(("good SCSI response, first word %#08x\n", RT_N2H_U32(pcrgResBHS[0])));
2706	break;
2707	case ISCSIOP_LOGIN_RES:
2708	/* Login responses must not contain contradicting transit and continue bits. */
2709	if ((hw0 & ISCSI_CONTINUE_BIT) && ((hw0 & ISCSI_TRANSIT_BIT) != 0))
2710	return VERR_PARSE_ERROR;
2711	break;
2712	case ISCSIOP_TEXT_RES:
2713	/* Text responses must not contain contradicting final and continue bits nor
2714	* may the final bit be set for PDUs containing a target transfer tag other than
2715	* the reserved transfer tag (and vice versa). */
2716	if ( (((hw0 & ISCSI_CONTINUE_BIT) && (hw0 & ISCSI_FINAL_BIT) != 0))
2717	\|\| (((hw0 & ISCSI_FINAL_BIT) && (RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD)))
2718	\|\| (((hw0 & ISCSI_FINAL_BIT) == 0) && (RT_N2H_U32(pcrgResBHS[5]) == ISCSI_TASK_TAG_RSVD)))
2719	return VERR_PARSE_ERROR;
2720	break;
2721	case ISCSIOP_SCSI_DATA_IN:
2722	/* SCSI Data-in responses must not contain contradicting residual bits when
2723	* status bit is set. */
2724	if ((hw0 & ISCSI_STATUS_BIT) && (hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
2725	return VERR_PARSE_ERROR;
2726	break;
2727	case ISCSIOP_LOGOUT_RES:
2728	/* Logout responses must not have the final bit unset and may not contain any
2729	* data or additional header segments. */
2730	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
2731	\|\| (RT_N2H_U32(pcrgResBHS[1]) != 0))
2732	return VERR_PARSE_ERROR;
2733	break;
2734	case ISCSIOP_ASYN_MSG:
2735	/* Asynchronous Messages must not have the final bit unset and may not contain
2736	* an initiator task tag. */
2737	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
2738	\|\| (RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD))
2739	return VERR_PARSE_ERROR;
2740	break;
2741	case ISCSIOP_SCSI_TASKMGMT_RES:
2742	case ISCSIOP_R2T:
2743	case ISCSIOP_REJECT:
2744	default:
2745	/* Do some logging, ignore PDU. */
2746	LogFlowFunc(("ignore unhandled PDU, first word %#08x\n", RT_N2H_U32(pcrgResBHS[0])));
2747	return VERR_PARSE_ERROR;
2748	}
2749	/* A target must not send PDUs with MaxCmdSN less than ExpCmdSN-1. */
2750
2751	if (serial_number_less(RT_N2H_U32(pcrgResBHS[8]), RT_N2H_U32(pcrgResBHS[7])-1))
2752	return VERR_PARSE_ERROR;
2753
2754	return VINF_SUCCESS;
2755	}
2756
2757
2758	/**
2759	* Prepares a PDU to transfer for the given command and adds it to the list.
2760	*/
2761	static int iscsiPDUTxPrepare(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
2762	{
2763	int rc = VINF_SUCCESS;
2764	uint32_t *paReqBHS;
2765	size_t cbData = 0;
2766	size_t cbSegs = 0;
2767	PSCSIREQ pScsiReq;
2768	PISCSIPDUTX pIScsiPDU = NULL;
2769
2770	LogFlowFunc(("pImage=%#p pIScsiCmd=%#p\n", pImage, pIScsiCmd));
2771
2772	Assert(pIScsiCmd->enmCmdType == ISCSICMDTYPE_REQ);
2773
2774	pIScsiCmd->Itt = iscsiNewITT(pImage);
2775	pScsiReq = pIScsiCmd->CmdType.ScsiReq.pScsiReq;
2776
2777	if (pScsiReq->cT2ISegs)
2778	RTSgBufInit(&pScsiReq->SgBufT2I, pScsiReq->paT2ISegs, pScsiReq->cT2ISegs);
2779
2780	/*
2781	* Allocate twice as much entries as required for padding (worst case).
2782	* The additional segment is for the BHS.
2783	*/
2784	size_t cI2TSegs = 2*(pScsiReq->cI2TSegs + 1);
2785	pIScsiPDU = (PISCSIPDUTX)RTMemAllocZ(RT_UOFFSETOF_DYN(ISCSIPDUTX, aISCSIReq[cI2TSegs]));
2786	if (!pIScsiPDU)
2787	return VERR_NO_MEMORY;
2788
2789	pIScsiPDU->pIScsiCmd = pIScsiCmd;
2790
2791	if (pScsiReq->enmXfer == SCSIXFER_FROM_TARGET)
2792	cbData = (uint32_t)pScsiReq->cbT2IData;
2793	else
2794	cbData = (uint32_t)pScsiReq->cbI2TData;
2795
2796	paReqBHS = pIScsiPDU->aBHS;
2797
2798	/* Setup the BHS. */
2799	paReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_SIMPLE \| ISCSIOP_SCSI_CMD
2800	\| (pScsiReq->enmXfer << 21)); /* I=0,F=1,Attr=Simple */
2801	paReqBHS[1] = RT_H2N_U32(0x00000000 \| ((uint32_t)pScsiReq->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
2802	paReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
2803	paReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
2804	paReqBHS[4] = pIScsiCmd->Itt;
2805	paReqBHS[5] = RT_H2N_U32((uint32_t)cbData); Assert((uint32_t)cbData == cbData);
2806	paReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2807	paReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2808	memcpy(paReqBHS + 8, pScsiReq->abCDB, pScsiReq->cbCDB);
2809
2810	pIScsiPDU->CmdSN = pImage->CmdSN;
2811	pImage->CmdSN++;
2812
2813	/* Setup the S/G buffers. */
2814	uint32_t cnISCSIReq = 0;
2815	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = sizeof(pIScsiPDU->aBHS);
2816	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = pIScsiPDU->aBHS;
2817	cnISCSIReq++;
2818	cbSegs = sizeof(pIScsiPDU->aBHS);
2819	/* Padding is not necessary for the BHS. */
2820
2821	if (pScsiReq->cbI2TData)
2822	{
2823	for (unsigned cSeg = 0; cSeg < pScsiReq->cI2TSegs; cSeg++)
2824	{
2825	Assert(cnISCSIReq < cI2TSegs);
2826	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = pScsiReq->paI2TSegs[cSeg].cbSeg;
2827	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = pScsiReq->paI2TSegs[cSeg].pvSeg;
2828	cbSegs += pScsiReq->paI2TSegs[cSeg].cbSeg;
2829	cnISCSIReq++;
2830
2831	/* Add padding if necessary. */
2832	if (pScsiReq->paI2TSegs[cSeg].cbSeg & 3)
2833	{
2834	Assert(cnISCSIReq < cI2TSegs);
2835	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = &pImage->aPadding[0];
2836	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = 4 - (pScsiReq->paI2TSegs[cSeg].cbSeg & 3);
2837	cbSegs += pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg;
2838	cnISCSIReq++;
2839	}
2840	}
2841	}
2842
2843	pIScsiPDU->cISCSIReq = cnISCSIReq;
2844	pIScsiPDU->cbSgLeft = cbSegs;
2845	RTSgBufInit(&pIScsiPDU->SgBuf, pIScsiPDU->aISCSIReq, cnISCSIReq);
2846
2847	/* Link the PDU to the list. */
2848	iscsiPDUTxAdd(pImage, pIScsiPDU, false /* fFront */);
2849
2850	/* Start transfer of a PDU if there is no one active at the moment. */
2851	if (!pImage->pIScsiPDUTxCur)
2852	rc = iscsiSendPDUAsync(pImage);
2853
2854	return rc;
2855	}
2856
2857
2858	/**
2859	* Updates the state of a request from the PDU we received.
2860	*
2861	* @return VBox status code.
2862	* @param pImage iSCSI connection state to use.
2863	* @param paRes Pointer to array of iSCSI response sections.
2864	* @param cnRes Number of valid iSCSI response sections in the array.
2865	*/
2866	static int iscsiRecvPDUUpdateRequest(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes)
2867	{
2868	int rc = VINF_SUCCESS;
2869	PISCSICMD pIScsiCmd;
2870	uint32_t *paResBHS;
2871
2872	LogFlowFunc(("pImage=%#p paRes=%#p cnRes=%u\n", pImage, paRes, cnRes));
2873
2874	Assert(cnRes == 1);
2875	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
2876
2877	paResBHS = (uint32_t *)paRes[0].pvSeg;
2878
2879	pIScsiCmd = iscsiCmdGetFromItt(pImage, paResBHS[4]);
2880
2881	if (pIScsiCmd)
2882	{
2883	bool final = false;
2884	PSCSIREQ pScsiReq;
2885
2886	LogFlow(("Found SCSI command %#p for Itt=%#u\n", pIScsiCmd, paResBHS[4]));
2887
2888	Assert(pIScsiCmd->enmCmdType == ISCSICMDTYPE_REQ);
2889	pScsiReq = pIScsiCmd->CmdType.ScsiReq.pScsiReq;
2890
2891	final = !!(RT_N2H_U32(paResBHS[0]) & ISCSI_FINAL_BIT);
2892	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(paResBHS[0]) & ISCSIOP_MASK);
2893	if (cmd == ISCSIOP_SCSI_RES)
2894	{
2895	/* This is the final PDU which delivers the status (and may be omitted if
2896	* the last Data-In PDU included successful completion status). Note
2897	* that ExpStatSN has been bumped already in iscsiRecvPDU. */
2898	if (!final \|\| ((RT_N2H_U32(paResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(paResBHS[6]) != pImage->ExpStatSN - 1))
2899	{
2900	/* SCSI Response in the wrong place or with a (target) failure. */
2901	LogFlow(("Wrong ExpStatSN value in PDU\n"));
2902	rc = VERR_PARSE_ERROR;
2903	}
2904	else
2905	{
2906	pScsiReq->status = RT_N2H_U32(paResBHS[0]) & 0x000000ff;
2907	size_t cbData = RT_N2H_U32(paResBHS[1]) & 0x00ffffff;
2908	void pvSense = (uint8_t )paRes[0].pvSeg + ISCSI_BHS_SIZE;
2909
2910	if (cbData >= 2)
2911	{
2912	uint32_t cbStat = RT_N2H_U32(((uint32_t *)pvSense)[0]) >> 16;
2913	if (cbStat + 2 > cbData)
2914	{
2915	rc = VERR_BUFFER_OVERFLOW;
2916	}
2917	else
2918	{
2919	/* Truncate sense data if it doesn't fit into the buffer. */
2920	pScsiReq->cbSense = RT_MIN(cbStat, pScsiReq->cbSense);
2921	memcpy(pScsiReq->abSense, (uint8_t *)pvSense + 2,
2922	RT_MIN(paRes[0].cbSeg - ISCSI_BHS_SIZE - 2, pScsiReq->cbSense));
2923	}
2924	}
2925	else if (cbData == 1)
2926	rc = VERR_PARSE_ERROR;
2927	else
2928	pScsiReq->cbSense = 0;
2929	}
2930	iscsiCmdComplete(pImage, pIScsiCmd, rc);
2931	}
2932	else if (cmd == ISCSIOP_SCSI_DATA_IN)
2933	{
2934	/* A Data-In PDU carries some data that needs to be added to the received
2935	* data in response to the command. There may be both partial and complete
2936	* Data-In PDUs, so collect data until the status is included or the status
2937	* is sent in a separate SCSI Result frame (see above). */
2938	size_t cbData = RT_N2H_U32(paResBHS[1]) & 0x00ffffff;
2939	void pvData = (uint8_t )paRes[0].pvSeg + ISCSI_BHS_SIZE;
2940
2941	if (final && cbData > pScsiReq->cbT2IData)
2942	{
2943	/* The received PDU is bigger than what we requested.
2944	* Must not happen under normal circumstances and is a target error. */
2945	rc = VERR_BUFFER_OVERFLOW;
2946	}
2947	else
2948	{
2949	/* Copy data from the received PDU into the T2I segments. */
2950	size_t cbCopied = RTSgBufCopyFromBuf(&pScsiReq->SgBufT2I, pvData, cbData);
2951	Assert(cbCopied == cbData); NOREF(cbCopied);
2952
2953	if (final && (RT_N2H_U32(paResBHS[0]) & ISCSI_STATUS_BIT) != 0)
2954	{
2955	pScsiReq->status = RT_N2H_U32(paResBHS[0]) & 0x000000ff;
2956	pScsiReq->cbSense = 0;
2957	iscsiCmdComplete(pImage, pIScsiCmd, VINF_SUCCESS);
2958	}
2959	}
2960	}
2961	else
2962	rc = VERR_PARSE_ERROR;
2963	}
2964
2965	/* Log any errors here but ignore the PDU. */
2966	if (RT_FAILURE(rc))
2967	{
2968	LogRel(("iSCSI: Received malformed PDU from target %s (rc=%Rrc), ignoring\n", pImage->pszTargetName, rc));
2969	iscsiDumpPacket(pImage, (PISCSIREQ)paRes, cnRes, rc, false /* fRequest */);
2970	rc = VINF_SUCCESS;
2971	}
2972
2973	return rc;
2974	}
2975
2976	/**
2977	* Appends a key-value pair to the buffer. Normal ASCII strings (cbValue == 0) and large binary values
2978	* of a given length (cbValue > 0) are directly supported. Other value types must be converted to ASCII
2979	* by the caller. Strings must be in UTF-8 encoding.
2980	*
2981	* @returns VBOX status
2982	* @param pbBuf Pointer to the key-value buffer.
2983	* @param cbBuf Length of the key-value buffer.
2984	* @param pcbBufCurr Currently used portion of the key-value buffer.
2985	* @param pcszKey Pointer to a string containing the key.
2986	* @param pcszValue Pointer to either a string containing the value or to a large binary value.
2987	* @param cbValue Length of the binary value if applicable.
2988	*/
2989	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char *pcszKey,
2990	const char *pcszValue, size_t cbValue)
2991	{
2992	size_t cbBufTmp = *pcbBufCurr;
2993	size_t cbKey = strlen(pcszKey);
2994	size_t cbValueEnc;
2995	uint8_t *pbCurr;
2996
2997	if (cbValue == 0)
2998	cbValueEnc = strlen(pcszValue);
2999	else
3000	cbValueEnc = cbValue * 2 + 2; /* 2 hex bytes per byte, 2 bytes prefix */
3001
3002	if (cbBuf < cbBufTmp + cbKey + 1 + cbValueEnc + 1)
3003	{
3004	/* Buffer would overflow, signal error. */
3005	return VERR_BUFFER_OVERFLOW;
3006	}
3007
3008	/*
3009	* Append a key=value pair (zero terminated string) to the end of the buffer.
3010	*/
3011	pbCurr = pbBuf + cbBufTmp;
3012	memcpy(pbCurr, pcszKey, cbKey);
3013	pbCurr += cbKey;
3014	*pbCurr++ = '=';
3015	if (cbValue == 0)
3016	{
3017	memcpy(pbCurr, pcszValue, cbValueEnc);
3018	pbCurr += cbValueEnc;
3019	}
3020	else
3021	{
3022	*pbCurr++ = '0';
3023	*pbCurr++ = 'x';
3024	for (uint32_t i = 0; i < cbValue; i++)
3025	{
3026	uint8_t b;
3027	b = pcszValue[i];
3028	*pbCurr++ = NUM_2_HEX(b >> 4);
3029	*pbCurr++ = NUM_2_HEX(b & 0xf);
3030	}
3031	}
3032	*pbCurr = '\0';
3033	*pcbBufCurr = cbBufTmp + cbKey + 1 + cbValueEnc + 1;
3034
3035	return VINF_SUCCESS;
3036	}
3037
3038
3039	/**
3040	* Retrieve the value for a given key from the key=value buffer.
3041	*
3042	* @returns VBox status code.
3043	* @param pbBuf Buffer containing key=value pairs.
3044	* @param cbBuf Length of buffer with key=value pairs.
3045	* @param pcszKey Pointer to key for which to retrieve the value.
3046	* @param ppcszValue Pointer to value string pointer.
3047	*/
3048	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue)
3049	{
3050	size_t cbKey = strlen(pcszKey);
3051
3052	while (cbBuf != 0)
3053	{
3054	size_t cbKeyValNull = strlen((const char *)pbBuf) + 1;
3055
3056	if (strncmp(pcszKey, (const char *)pbBuf, cbKey) == 0 && pbBuf[cbKey] == '=')
3057	{
3058	ppcszValue = (const char )(pbBuf + cbKey + 1);
3059	return VINF_SUCCESS;
3060	}
3061	pbBuf += cbKeyValNull;
3062	cbBuf -= cbKeyValNull;
3063	}
3064	return VERR_INVALID_NAME;
3065	}
3066
3067
3068	/**
3069	* Convert a long-binary value from a value string to the binary representation.
3070	*
3071	* @returns VBOX status
3072	* @param pcszValue Pointer to a string containing the textual value representation.
3073	* @param pbValue Pointer to the value buffer for the binary value.
3074	* @param pcbValue In: length of value buffer, out: actual length of binary value.
3075	*/
3076	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue)
3077	{
3078	size_t cbValue = *pcbValue;
3079	char c1, c2, c3, c4;
3080	Assert(cbValue >= 1);
3081
3082	if (strlen(pcszValue) < 3)
3083	return VERR_PARSE_ERROR;
3084	if (*pcszValue++ != '0')
3085	return VERR_PARSE_ERROR;
3086	switch (*pcszValue++)
3087	{
3088	case 'x':
3089	case 'X':
3090	if (strlen(pcszValue) & 1)
3091	{
3092	c1 = *pcszValue++;
3093	*pbValue++ = HEX_2_NUM(c1);
3094	cbValue--;
3095	}
3096	while (*pcszValue != '\0')
3097	{
3098	if (cbValue == 0)
3099	return VERR_BUFFER_OVERFLOW;
3100	c1 = *pcszValue++;
3101	if ((c1 < '0' \|\| c1 > '9') && (c1 < 'a' \|\| c1 > 'f') && (c1 < 'A' \|\| c1 > 'F'))
3102	return VERR_PARSE_ERROR;
3103	c2 = *pcszValue++;
3104	if ((c2 < '0' \|\| c2 > '9') && (c2 < 'a' \|\| c2 > 'f') && (c2 < 'A' \|\| c2 > 'F'))
3105	return VERR_PARSE_ERROR;
3106	*pbValue++ = (HEX_2_NUM(c1) << 4) \| HEX_2_NUM(c2);
3107	cbValue--;
3108	}
3109	*pcbValue -= cbValue;
3110	break;
3111	case 'b':
3112	case 'B':
3113	if ((strlen(pcszValue) & 3) != 0)
3114	return VERR_PARSE_ERROR;
3115	while (*pcszValue != '\0')
3116	{
3117	uint32_t temp;
3118	if (cbValue == 0)
3119	return VERR_BUFFER_OVERFLOW;
3120	c1 = *pcszValue++;
3121	if ((c1 < 'A' \|\| c1 > 'Z') && (c1 < 'a' \|\| c1 >'z') && (c1 < '0' \|\| c1 > '9') && (c1 != '+') && (c1 != '/'))
3122	return VERR_PARSE_ERROR;
3123	c2 = *pcszValue++;
3124	if ((c2 < 'A' \|\| c2 > 'Z') && (c2 < 'a' \|\| c2 >'z') && (c2 < '0' \|\| c2 > '9') && (c2 != '+') && (c2 != '/'))
3125	return VERR_PARSE_ERROR;
3126	c3 = *pcszValue++;
3127	if ((c3 < 'A' \|\| c3 > 'Z') && (c3 < 'a' \|\| c3 >'z') && (c3 < '0' \|\| c3 > '9') && (c3 != '+') && (c3 != '/') && (c3 != '='))
3128	return VERR_PARSE_ERROR;
3129	c4 = *pcszValue++;
3130	if ( (c3 == '=' && c4 != '=')
3131	\|\| ((c4 < 'A' \|\| c4 > 'Z') && (c4 < 'a' \|\| c4 >'z') && (c4 < '0' \|\| c4 > '9') && (c4 != '+') && (c4 != '/') && (c4 != '=')))
3132	return VERR_PARSE_ERROR;
3133	temp = (B64_2_NUM(c1) << 18) \| (B64_2_NUM(c2) << 12);
3134	if (c3 == '=') {
3135	if (*pcszValue != '\0')
3136	return VERR_PARSE_ERROR;
3137	*pbValue++ = temp >> 16;
3138	cbValue--;
3139	} else {
3140	temp \|= B64_2_NUM(c3) << 6;
3141	if (c4 == '=') {
3142	if (*pcszValue != '\0')
3143	return VERR_PARSE_ERROR;
3144	if (cbValue < 2)
3145	return VERR_BUFFER_OVERFLOW;
3146	*pbValue++ = temp >> 16;
3147	*pbValue++ = (temp >> 8) & 0xff;
3148	cbValue -= 2;
3149	}
3150	else
3151	{
3152	temp \|= B64_2_NUM(c4);
3153	if (cbValue < 3)
3154	return VERR_BUFFER_OVERFLOW;
3155	*pbValue++ = temp >> 16;
3156	*pbValue++ = (temp >> 8) & 0xff;
3157	*pbValue++ = temp & 0xff;
3158	cbValue -= 3;
3159	}
3160	}
3161	}
3162	*pcbValue -= cbValue;
3163	break;
3164	default:
3165	return VERR_PARSE_ERROR;
3166	}
3167	return VINF_SUCCESS;
3168	}
3169
3170
3171	/**
3172	* Retrieve the relevant parameter values and update the initiator state.
3173	*
3174	* @returns VBox status code.
3175	* @param pImage Current iSCSI initiator state.
3176	* @param pbBuf Buffer containing key=value pairs.
3177	* @param cbBuf Length of buffer with key=value pairs.
3178	*/
3179	static int iscsiUpdateParameters(PISCSIIMAGE pImage, const uint8_t *pbBuf, size_t cbBuf)
3180	{
3181	int rc;
3182	const char *pcszMaxRecvDataSegmentLength = NULL;
3183	const char *pcszMaxBurstLength = NULL;
3184	const char *pcszFirstBurstLength = NULL;
3185	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "MaxRecvDataSegmentLength", &pcszMaxRecvDataSegmentLength);
3186	if (rc == VERR_INVALID_NAME)
3187	rc = VINF_SUCCESS;
3188	if (RT_FAILURE(rc))
3189	return VERR_PARSE_ERROR;
3190	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "MaxBurstLength", &pcszMaxBurstLength);
3191	if (rc == VERR_INVALID_NAME)
3192	rc = VINF_SUCCESS;
3193	if (RT_FAILURE(rc))
3194	return VERR_PARSE_ERROR;
3195	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "FirstBurstLength", &pcszFirstBurstLength);
3196	if (rc == VERR_INVALID_NAME)
3197	rc = VINF_SUCCESS;
3198	if (RT_FAILURE(rc))
3199	return VERR_PARSE_ERROR;
3200	if (pcszMaxRecvDataSegmentLength)
3201	{
3202	uint32_t cb = pImage->cbSendDataLength;
3203	rc = RTStrToUInt32Full(pcszMaxRecvDataSegmentLength, 0, &cb);
3204	AssertRC(rc);
3205	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3206	}
3207	if (pcszMaxBurstLength)
3208	{
3209	uint32_t cb = pImage->cbSendDataLength;
3210	rc = RTStrToUInt32Full(pcszMaxBurstLength, 0, &cb);
3211	AssertRC(rc);
3212	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3213	}
3214	if (pcszFirstBurstLength)
3215	{
3216	uint32_t cb = pImage->cbSendDataLength;
3217	rc = RTStrToUInt32Full(pcszFirstBurstLength, 0, &cb);
3218	AssertRC(rc);
3219	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3220	}
3221	return VINF_SUCCESS;
3222	}
3223
3224
3225	static bool serial_number_less(uint32_t s1, uint32_t s2)
3226	{
3227	return (s1 < s2 && s2 - s1 < 0x80000000) \|\| (s1 > s2 && s1 - s2 > 0x80000000);
3228	}
3229
3230	static bool serial_number_greater(uint32_t s1, uint32_t s2)
3231	{
3232	return (s1 < s2 && s2 - s1 > 0x80000000) \|\| (s1 > s2 && s1 - s2 < 0x80000000);
3233	}
3234
3235
3236	#ifdef IMPLEMENT_TARGET_AUTH
3237	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge)
3238	{
3239	uint8_t cbChallenge;
3240
3241	cbChallenge = RTrand_U8(CHAP_MD5_CHALLENGE_MIN, CHAP_MD5_CHALLENGE_MAX);
3242	RTrand_bytes(pbChallenge, cbChallenge);
3243	*pcbChallenge = cbChallenge;
3244	}
3245	#endif
3246
3247
3248	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
3249	const uint8_t *pbSecret, size_t cbSecret)
3250	{
3251	RTMD5CONTEXT ctx;
3252	uint8_t bId;
3253
3254	bId = id;
3255	RTMd5Init(&ctx);
3256	RTMd5Update(&ctx, &bId, 1);
3257	RTMd5Update(&ctx, pbSecret, cbSecret);
3258	RTMd5Update(&ctx, pbChallenge, cbChallenge);
3259	RTMd5Final(pbResponse, &ctx);
3260	}
3261
3262	/**
3263	* Internal. - Wrapper around the extended select callback of the net interface.
3264	*/
3265	DECLINLINE(int) iscsiIoThreadWait(PISCSIIMAGE pImage, RTMSINTERVAL cMillies, uint32_t fEvents, uint32_t *pfEvents)
3266	{
3267	return pImage->pIfNet->pfnSelectOneEx(pImage->Socket, fEvents, pfEvents, cMillies);
3268	}
3269
3270	/**
3271	* Internal. - Pokes a thread waiting for I/O.
3272	*/
3273	DECLINLINE(int) iscsiIoThreadPoke(PISCSIIMAGE pImage)
3274	{
3275	return pImage->pIfNet->pfnPoke(pImage->Socket);
3276	}
3277
3278	/**
3279	* Internal. - Get the next request from the queue.
3280	*/
3281	DECLINLINE(PISCSICMD) iscsiCmdGet(PISCSIIMAGE pImage)
3282	{
3283	int rc;
3284	PISCSICMD pIScsiCmd = NULL;
3285
3286	rc = RTSemMutexRequest(pImage->MutexReqQueue, RT_INDEFINITE_WAIT);
3287	AssertRC(rc);
3288
3289	pIScsiCmd = pImage->pScsiReqQueue;
3290	if (pIScsiCmd)
3291	{
3292	pImage->pScsiReqQueue = pIScsiCmd->pNext;
3293	pIScsiCmd->pNext = NULL;
3294	}
3295
3296	rc = RTSemMutexRelease(pImage->MutexReqQueue);
3297	AssertRC(rc);
3298
3299	return pIScsiCmd;
3300	}
3301
3302
3303	/**
3304	* Internal. - Adds the given command to the queue.
3305	*/
3306	DECLINLINE(int) iscsiCmdPut(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
3307	{
3308	int rc = RTSemMutexRequest(pImage->MutexReqQueue, RT_INDEFINITE_WAIT);
3309	AssertRC(rc);
3310
3311	pIScsiCmd->pNext = pImage->pScsiReqQueue;
3312	pImage->pScsiReqQueue = pIScsiCmd;
3313
3314	rc = RTSemMutexRelease(pImage->MutexReqQueue);
3315	AssertRC(rc);
3316
3317	iscsiIoThreadPoke(pImage);
3318
3319	return rc;
3320	}
3321
3322	/**
3323	* Internal. - Completes the request with the appropriate action.
3324	* Synchronous requests are completed with waking up the thread
3325	* and asynchronous ones by continuing the associated I/O context.
3326	*/
3327	static void iscsiCmdComplete(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd, int rcCmd)
3328	{
3329	LogFlowFunc(("pImage=%#p pIScsiCmd=%#p rcCmd=%Rrc\n", pImage, pIScsiCmd, rcCmd));
3330
3331	/* Remove from the table first. */
3332	iscsiCmdRemove(pImage, pIScsiCmd->Itt);
3333
3334	/* Call completion callback. */
3335	pIScsiCmd->pfnComplete(pImage, rcCmd, pIScsiCmd->pvUser);
3336
3337	/* Free command structure. */
3338	#ifdef DEBUG
3339	memset(pIScsiCmd, 0xff, sizeof(ISCSICMD));
3340	#endif
3341	RTMemFree(pIScsiCmd);
3342	}
3343
3344	/**
3345	* Clears all RX/TX PDU states and returns the command for the current
3346	* pending TX PDU if existing.
3347	*
3348	* @returns Pointer to the iSCSI command for the current PDU transmitted or NULL
3349	* if none is waiting.
3350	* @param pImage iSCSI connection state.
3351	*/
3352	static PISCSICMD iscsiPDURxTxClear(PISCSIIMAGE pImage)
3353	{
3354	PISCSICMD pIScsiCmdHead = NULL;
3355	PISCSIPDUTX pIScsiPDUTx = NULL;
3356
3357	/* Reset PDU we are receiving. */
3358	iscsiRecvPDUReset(pImage);
3359
3360	/*
3361	* Abort all PDUs we are about to transmit,
3362	* the command need a new Itt if the relogin is successful.
3363	*/
3364	while (pImage->pIScsiPDUTxHead)
3365	{
3366	pIScsiPDUTx = pImage->pIScsiPDUTxHead;
3367	pImage->pIScsiPDUTxHead = pIScsiPDUTx->pNext;
3368
3369	PISCSICMD pIScsiCmd = pIScsiPDUTx->pIScsiCmd;
3370	if (pIScsiCmd)
3371	{
3372	/* Place on command list. */
3373	pIScsiCmd->pNext = pIScsiCmdHead;
3374	pIScsiCmdHead = pIScsiCmd;
3375	}
3376	RTMemFree(pIScsiPDUTx);
3377	}
3378
3379	/* Clear the tail pointer (safety precaution). */
3380	pImage->pIScsiPDUTxTail = NULL;
3381
3382	/* Clear the current PDU too. */
3383	if (pImage->pIScsiPDUTxCur)
3384	{
3385	pIScsiPDUTx = pImage->pIScsiPDUTxCur;
3386
3387	pImage->pIScsiPDUTxCur = NULL;
3388	PISCSICMD pIScsiCmd = pIScsiPDUTx->pIScsiCmd;
3389	if (pIScsiCmd)
3390	{
3391	pIScsiCmd->pNext = pIScsiCmdHead;
3392	pIScsiCmdHead = pIScsiCmd;
3393	}
3394	RTMemFree(pIScsiPDUTx);
3395	}
3396
3397	return pIScsiCmdHead;
3398	}
3399
3400	/**
3401	* Rests the iSCSI connection state and returns a list of iSCSI commands pending
3402	* when this was called.
3403	*
3404	* @returns Pointer to the head of the pending iSCSI command list.
3405	* @param pImage iSCSI connection state.
3406	*/
3407	static PISCSICMD iscsiReset(PISCSIIMAGE pImage)
3408	{
3409	PISCSICMD pIScsiCmdHead = NULL;
3410	PISCSICMD pIScsiCmdCur = NULL;
3411
3412	/* Clear all in flight PDUs. */
3413	pIScsiCmdHead = iscsiPDURxTxClear(pImage);
3414
3415	/*
3416	* Get all commands which are waiting for a response
3417	* They need to be resend too after a successful reconnect.
3418	*/
3419	PISCSICMD pIScsiCmd = iscsiCmdRemoveAll(pImage);
3420	if (pIScsiCmd)
3421	{
3422	pIScsiCmdCur = pIScsiCmd;
3423	while (pIScsiCmdCur->pNext)
3424	pIScsiCmdCur = pIScsiCmdCur->pNext;
3425
3426	/*
3427	* Place them in front of the list because they are the oldest requests
3428	* and need to be processed first to minimize the risk to time out.
3429	*/
3430	pIScsiCmdCur->pNext = pIScsiCmdHead;
3431	pIScsiCmdHead = pIScsiCmd;
3432	}
3433
3434	return pIScsiCmdHead;
3435	}
3436
3437	/**
3438	* Reattaches the to the target after an error aborting
3439	* pending commands and resending them.
3440	*
3441	* @param pImage iSCSI connection state.
3442	*/
3443	static void iscsiReattach(PISCSIIMAGE pImage)
3444	{
3445	/* Close connection. */
3446	iscsiTransportClose(pImage);
3447	pImage->state = ISCSISTATE_FREE;
3448
3449	/* Reset the state and get the currently pending commands. */
3450	PISCSICMD pIScsiCmdHead = iscsiReset(pImage);
3451
3452	/* Try to attach. */
3453	int rc = iscsiAttach(pImage);
3454	if (RT_SUCCESS(rc))
3455	{
3456	/* Phew, we have a connection again.
3457	* Prepare new PDUs for the aborted commands.
3458	*/
3459	while (pIScsiCmdHead)
3460	{
3461	PISCSICMD pIScsiCmd = pIScsiCmdHead;
3462	pIScsiCmdHead = pIScsiCmdHead->pNext;
3463
3464	pIScsiCmd->pNext = NULL;
3465
3466	rc = iscsiPDUTxPrepare(pImage, pIScsiCmd);
3467	if (RT_FAILURE(rc))
3468	break;
3469	}
3470
3471	if (RT_FAILURE(rc))
3472	{
3473	/* Another error, just give up and report an error. */
3474	PISCSICMD pIScsiCmd = iscsiReset(pImage);
3475
3476	/* Concatenate both lists together so we can abort all requests below. */
3477	if (pIScsiCmd)
3478	{
3479	PISCSICMD pIScsiCmdCur = pIScsiCmd;
3480	while (pIScsiCmdCur->pNext)
3481	pIScsiCmdCur = pIScsiCmdCur->pNext;
3482
3483	pIScsiCmdCur->pNext = pIScsiCmdHead;
3484	pIScsiCmdHead = pIScsiCmd;
3485	}
3486	}
3487	}
3488
3489	if (RT_FAILURE(rc))
3490	{
3491	/*
3492	* Still no luck, complete commands with error so the caller
3493	* has a chance to inform the user and maybe resend the command.
3494	*/
3495	while (pIScsiCmdHead)
3496	{
3497	PISCSICMD pIScsiCmd = pIScsiCmdHead;
3498	pIScsiCmdHead = pIScsiCmdHead->pNext;
3499
3500	iscsiCmdComplete(pImage, pIScsiCmd, VERR_BROKEN_PIPE);
3501	}
3502	}
3503	}
3504
3505	/**
3506	* Internal. Main iSCSI I/O worker.
3507	*/
3508	static DECLCALLBACK(int) iscsiIoThreadWorker(RTTHREAD hThreadSelf, void *pvUser)
3509	{
3510	RT_NOREF1(hThreadSelf);
3511	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
3512
3513	/* Initialize the initial event mask. */
3514	pImage->fPollEvents = VD_INTERFACETCPNET_EVT_READ \| VD_INTERFACETCPNET_EVT_ERROR;
3515
3516	while (pImage->fRunning)
3517	{
3518	uint32_t fEvents;
3519	int rc;
3520
3521	fEvents = 0;
3522
3523	/* Wait for work or for data from the target. */
3524	RTMSINTERVAL msWait;
3525
3526	if (pImage->cCmdsWaiting)
3527	{
3528	pImage->fPollEvents &= ~VD_INTERFACETCPNET_HINT_INTERRUPT;
3529	msWait = pImage->uReadTimeout;
3530	}
3531	else
3532	{
3533	pImage->fPollEvents \|= VD_INTERFACETCPNET_HINT_INTERRUPT;
3534	msWait = RT_INDEFINITE_WAIT;
3535	}
3536
3537	LogFlow(("Waiting for events fPollEvents=%#x\n", pImage->fPollEvents));
3538	rc = iscsiIoThreadWait(pImage, msWait, pImage->fPollEvents, &fEvents);
3539	if (rc == VERR_INTERRUPTED)
3540	{
3541	/* Check the queue. */
3542	PISCSICMD pIScsiCmd = iscsiCmdGet(pImage);
3543
3544	while (pIScsiCmd)
3545	{
3546	switch (pIScsiCmd->enmCmdType)
3547	{
3548	case ISCSICMDTYPE_REQ:
3549	{
3550	if ( !iscsiIsClientConnected(pImage)
3551	&& pImage->fTryReconnect)
3552	{
3553	pImage->fTryReconnect = false;
3554	iscsiReattach(pImage);
3555	}
3556
3557	/* If there is no connection complete the command with an error. */
3558	if (RT_LIKELY(iscsiIsClientConnected(pImage)))
3559	{
3560	rc = iscsiPDUTxPrepare(pImage, pIScsiCmd);
3561	if (RT_FAILURE(rc))
3562	iscsiReattach(pImage);
3563	}
3564	else
3565	iscsiCmdComplete(pImage, pIScsiCmd, VERR_NET_CONNECTION_REFUSED);
3566	break;
3567	}
3568	case ISCSICMDTYPE_EXEC:
3569	{
3570	rc = pIScsiCmd->CmdType.Exec.pfnExec(pIScsiCmd->CmdType.Exec.pvUser);
3571	iscsiCmdComplete(pImage, pIScsiCmd, rc);
3572	break;
3573	}
3574	default:
3575	AssertMsgFailed(("Invalid command type %d\n", pIScsiCmd->enmCmdType));
3576	}
3577
3578	pIScsiCmd = iscsiCmdGet(pImage);
3579	}
3580	}
3581	else if (rc == VERR_TIMEOUT && pImage->cCmdsWaiting)
3582	{
3583	/*
3584	* We are waiting for a response from the target but
3585	* it didn't answered yet.
3586	* We assume the connection is broken and try to reconnect.
3587	*/
3588	LogFlow(("Timed out while waiting for an answer from the target, reconnecting\n"));
3589	iscsiReattach(pImage);
3590	}
3591	else if (RT_SUCCESS(rc) \|\| rc == VERR_TIMEOUT)
3592	{
3593	Assert(pImage->state == ISCSISTATE_NORMAL);
3594	LogFlow(("Got socket events %#x\n", fEvents));
3595
3596	if (fEvents & VD_INTERFACETCPNET_EVT_READ)
3597	{
3598	/* Continue or start a new PDU receive task */
3599	LogFlow(("There is data on the socket\n"));
3600	rc = iscsiRecvPDUAsync(pImage);
3601	if (rc == VERR_BROKEN_PIPE)
3602	iscsiReattach(pImage);
3603	else if (RT_FAILURE(rc))
3604	iscsiLogRel(pImage, "iSCSI: Handling incoming request failed %Rrc\n", rc);
3605	}
3606
3607	if (fEvents & VD_INTERFACETCPNET_EVT_WRITE)
3608	{
3609	LogFlow(("The socket is writable\n"));
3610	rc = iscsiSendPDUAsync(pImage);
3611	if (RT_FAILURE(rc))
3612	{
3613	/*
3614	* Something unexpected happened, log the error and try to reset everything
3615	* by reattaching to the target.
3616	*/
3617	iscsiLogRel(pImage, "iSCSI: Sending PDU failed %Rrc\n", rc);
3618	iscsiReattach(pImage);
3619	}
3620	}
3621
3622	if (fEvents & VD_INTERFACETCPNET_EVT_ERROR)
3623	{
3624	LogFlow(("An error ocurred\n"));
3625	iscsiReattach(pImage);
3626	}
3627	}
3628	else
3629	iscsiLogRel(pImage, "iSCSI: Waiting for I/O failed rc=%Rrc\n", rc);
3630	}
3631
3632	return VINF_SUCCESS;
3633	}
3634
3635	/**
3636	* Internal. - Enqueues a request asynchronously.
3637	*/
3638	static int iscsiCommandAsync(PISCSIIMAGE pImage, PSCSIREQ pScsiReq,
3639	PFNISCSICMDCOMPLETED pfnComplete, void *pvUser)
3640	{
3641	int rc;
3642
3643	if (pImage->fExtendedSelectSupported)
3644	{
3645	PISCSICMD pIScsiCmd = (PISCSICMD)RTMemAllocZ(sizeof(ISCSICMD));
3646	if (!pIScsiCmd)
3647	return VERR_NO_MEMORY;
3648
3649	/* Init the command structure. */
3650	pIScsiCmd->pNext = NULL;
3651	pIScsiCmd->enmCmdType = ISCSICMDTYPE_REQ;
3652	pIScsiCmd->pfnComplete = pfnComplete;
3653	pIScsiCmd->pvUser = pvUser;
3654	pIScsiCmd->CmdType.ScsiReq.pScsiReq = pScsiReq;
3655
3656	rc = iscsiCmdPut(pImage, pIScsiCmd);
3657	if (RT_FAILURE(rc))
3658	RTMemFree(pIScsiCmd);
3659	}
3660	else
3661	rc = VERR_NOT_SUPPORTED;
3662
3663	return rc;
3664	}
3665
3666	static DECLCALLBACK(void) iscsiCommandCompleteSync(PISCSIIMAGE pImage, int rcReq, void *pvUser)
3667	{
3668	RT_NOREF1(pImage);
3669	PISCSICMDSYNC pIScsiCmdSync = (PISCSICMDSYNC)pvUser;
3670
3671	pIScsiCmdSync->rcCmd = rcReq;
3672	int rc = RTSemEventSignal(pIScsiCmdSync->EventSem);
3673	AssertRC(rc);
3674	}
3675
3676	/**
3677	* Internal. - Enqueues a request in a synchronous fashion
3678	* i.e. returns when the request completed.
3679	*/
3680	static int iscsiCommandSync(PISCSIIMAGE pImage, PSCSIREQ pScsiReq, bool fRetry, int rcSense)
3681	{
3682	int rc;
3683
3684	if (pImage->fExtendedSelectSupported)
3685	{
3686	ISCSICMDSYNC IScsiCmdSync;
3687
3688	/* Create event semaphore. */
3689	rc = RTSemEventCreate(&IScsiCmdSync.EventSem);
3690	if (RT_FAILURE(rc))
3691	return rc;
3692
3693	if (fRetry)
3694	{
3695	for (unsigned i = 0; i < 10; i++)
3696	{
3697	rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandCompleteSync, &IScsiCmdSync);
3698	if (RT_FAILURE(rc))
3699	break;
3700
3701	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3702	AssertRC(rc);
3703	rc = IScsiCmdSync.rcCmd;
3704
3705	if ( (RT_SUCCESS(rc) && !pScsiReq->cbSense)
3706	\|\| RT_FAILURE(rc))
3707	break;
3708	rc = rcSense;
3709	}
3710	}
3711	else
3712	{
3713	rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandCompleteSync, &IScsiCmdSync);
3714	if (RT_SUCCESS(rc))
3715	{
3716	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3717	AssertRC(rc);
3718	rc = IScsiCmdSync.rcCmd;
3719
3720	if (RT_FAILURE(rc) \|\| pScsiReq->cbSense > 0)
3721	rc = rcSense;
3722	}
3723	}
3724
3725	RTSemEventDestroy(IScsiCmdSync.EventSem);
3726	}
3727	else
3728	{
3729	if (fRetry)
3730	{
3731	rc = VINF_SUCCESS; /* (MSC incorrectly thinks it can be uninitialized) */
3732	for (unsigned i = 0; i < 10; i++)
3733	{
3734	rc = iscsiCommand(pImage, pScsiReq);
3735	if ( (RT_SUCCESS(rc) && !pScsiReq->cbSense)
3736	\|\| RT_FAILURE(rc))
3737	break;
3738	rc = rcSense;
3739	}
3740	}
3741	else
3742	{
3743	rc = iscsiCommand(pImage, pScsiReq);
3744	if (RT_FAILURE(rc) \|\| pScsiReq->cbSense > 0)
3745	rc = rcSense;
3746	}
3747	}
3748
3749	return rc;
3750	}
3751
3752
3753	/**
3754	* Internal. - Executes a given function in a synchronous fashion
3755	* on the I/O thread if available.
3756	*/
3757	static int iscsiExecSync(PISCSIIMAGE pImage, PFNISCSIEXEC pfnExec, void *pvUser)
3758	{
3759	int rc;
3760
3761	if (pImage->fExtendedSelectSupported)
3762	{
3763	ISCSICMDSYNC IScsiCmdSync;
3764	PISCSICMD pIScsiCmd = (PISCSICMD)RTMemAllocZ(sizeof(ISCSICMD));
3765	if (!pIScsiCmd)
3766	return VERR_NO_MEMORY;
3767
3768	/* Create event semaphore. */
3769	rc = RTSemEventCreate(&IScsiCmdSync.EventSem);
3770	if (RT_FAILURE(rc))
3771	{
3772	RTMemFree(pIScsiCmd);
3773	return rc;
3774	}
3775
3776	/* Init the command structure. */
3777	pIScsiCmd->pNext = NULL;
3778	pIScsiCmd->enmCmdType = ISCSICMDTYPE_EXEC;
3779	pIScsiCmd->pfnComplete = iscsiCommandCompleteSync;
3780	pIScsiCmd->pvUser = &IScsiCmdSync;
3781	pIScsiCmd->CmdType.Exec.pfnExec = pfnExec;
3782	pIScsiCmd->CmdType.Exec.pvUser = pvUser;
3783
3784	rc = iscsiCmdPut(pImage, pIScsiCmd);
3785	if (RT_FAILURE(rc))
3786	RTMemFree(pIScsiCmd);
3787	else
3788	{
3789	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3790	AssertRC(rc);
3791	rc = IScsiCmdSync.rcCmd;
3792	}
3793
3794	RTSemEventDestroy(IScsiCmdSync.EventSem);
3795	}
3796	else
3797	{
3798	/* No I/O thread, execute in the current thread. */
3799	rc = pfnExec(pvUser);
3800	}
3801
3802	return rc;
3803	}
3804
3805
3806	static DECLCALLBACK(void) iscsiCommandAsyncComplete(PISCSIIMAGE pImage, int rcReq, void *pvUser)
3807	{
3808	bool fComplete = true;
3809	size_t cbTransfered = 0;
3810	PSCSIREQ pScsiReq = (PSCSIREQ)pvUser;
3811
3812	if (RT_SUCCESS(rcReq))
3813	ASMAtomicWriteU32(&pImage->cLoginsSinceIo, 0);
3814
3815	if ( RT_SUCCESS(rcReq)
3816	&& pScsiReq->cbSense > 0)
3817	{
3818	/* Try again if possible. */
3819	if (pScsiReq->cSenseRetries > 0)
3820	{
3821	pScsiReq->cSenseRetries--;
3822	pScsiReq->cbSense = sizeof(pScsiReq->abSense);
3823	int rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandAsyncComplete, pScsiReq);
3824	if (RT_SUCCESS(rc))
3825	fComplete = false;
3826	else
3827	rcReq = pScsiReq->rcSense;
3828	}
3829	else
3830	rcReq = pScsiReq->rcSense;
3831	}
3832
3833	if (fComplete)
3834	{
3835	if (pScsiReq->enmXfer == SCSIXFER_FROM_TARGET)
3836	cbTransfered = pScsiReq->cbT2IData;
3837	else if (pScsiReq->enmXfer == SCSIXFER_TO_TARGET)
3838	cbTransfered = pScsiReq->cbI2TData;
3839	else
3840	AssertMsg(pScsiReq->enmXfer == SCSIXFER_NONE, ("To/From transfers are not supported yet\n"));
3841
3842	/* Continue I/O context. */
3843	pImage->pIfIo->pfnIoCtxCompleted(pImage->pIfIo->Core.pvUser,
3844	pScsiReq->pIoCtx, rcReq,
3845	cbTransfered);
3846
3847	RTMemFree(pScsiReq);
3848	}
3849	}
3850
3851
3852	/**
3853	* Internal. Free all allocated space for representing an image, and optionally
3854	* delete the image from disk.
3855	*/
3856	static int iscsiFreeImage(PISCSIIMAGE pImage, bool fDelete)
3857	{
3858	int rc = VINF_SUCCESS;
3859	Assert(!fDelete); NOREF(fDelete); /* This MUST be false, the flag isn't supported. */
3860
3861	/* Freeing a never allocated image (e.g. because the open failed) is
3862	* not signalled as an error. After all nothing bad happens. */
3863	if (pImage)
3864	{
3865	if (pImage->Mutex != NIL_RTSEMMUTEX)
3866	{
3867	/* Detaching only makes sense when the mutex is there. Otherwise the
3868	* failure happened long before we could attach to the target. */
3869	iscsiExecSync(pImage, iscsiDetach, pImage);
3870	RTSemMutexDestroy(pImage->Mutex);
3871	pImage->Mutex = NIL_RTSEMMUTEX;
3872	}
3873	if (pImage->hThreadIo != NIL_RTTHREAD)
3874	{
3875	ASMAtomicXchgBool(&pImage->fRunning, false);
3876	rc = iscsiIoThreadPoke(pImage);
3877	AssertRC(rc);
3878
3879	/* Wait for the thread to terminate. */
3880	rc = RTThreadWait(pImage->hThreadIo, RT_INDEFINITE_WAIT, NULL);
3881	AssertRC(rc);
3882	}
3883	/* Destroy the socket. */
3884	if (pImage->Socket != NIL_VDSOCKET)
3885	{
3886	pImage->pIfNet->pfnSocketDestroy(pImage->Socket);
3887	}
3888	if (pImage->MutexReqQueue != NIL_RTSEMMUTEX)
3889	{
3890	RTSemMutexDestroy(pImage->MutexReqQueue);
3891	pImage->MutexReqQueue = NIL_RTSEMMUTEX;
3892	}
3893	if (pImage->pszTargetName)
3894	{
3895	RTMemFree(pImage->pszTargetName);
3896	pImage->pszTargetName = NULL;
3897	}
3898	if (pImage->pszTargetAddress)
3899	{
3900	RTMemFree(pImage->pszTargetAddress);
3901	pImage->pszTargetAddress = NULL;
3902	}
3903	if (pImage->pszInitiatorName)
3904	{
3905	if (pImage->fAutomaticInitiatorName)
3906	RTStrFree(pImage->pszInitiatorName);
3907	else
3908	RTMemFree(pImage->pszInitiatorName);
3909	pImage->pszInitiatorName = NULL;
3910	}
3911	if (pImage->pszInitiatorUsername)
3912	{
3913	RTMemFree(pImage->pszInitiatorUsername);
3914	pImage->pszInitiatorUsername = NULL;
3915	}
3916	if (pImage->pbInitiatorSecret)
3917	{
3918	RTMemFree(pImage->pbInitiatorSecret);
3919	pImage->pbInitiatorSecret = NULL;
3920	}
3921	if (pImage->pszTargetUsername)
3922	{
3923	RTMemFree(pImage->pszTargetUsername);
3924	pImage->pszTargetUsername = NULL;
3925	}
3926	if (pImage->pbTargetSecret)
3927	{
3928	RTMemFree(pImage->pbTargetSecret);
3929	pImage->pbTargetSecret = NULL;
3930	}
3931	if (pImage->pvRecvPDUBuf)
3932	{
3933	RTMemFree(pImage->pvRecvPDUBuf);
3934	pImage->pvRecvPDUBuf = NULL;
3935	}
3936	if (pImage->pszHostname)
3937	{
3938	RTMemFree(pImage->pszHostname);
3939	pImage->pszHostname = NULL;
3940	}
3941
3942	pImage->cbRecvPDUResidual = 0;
3943	}
3944
3945	LogFlowFunc(("returns %Rrc\n", rc));
3946	return rc;
3947	}
3948
3949	/**
3950	* Inits the basic iSCSI image state, allocating vital resources.
3951	*
3952	* @returns VBox status code.
3953	* @param pImage The iSCSI image instance.
3954	*/
3955	static int iscsiOpenImageInit(PISCSIIMAGE pImage)
3956	{
3957	int rc = VINF_SUCCESS;
3958
3959	/* Get error signalling interface. */
3960	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
3961
3962	/* Get TCP network stack interface. */
3963	pImage->pIfNet = VDIfTcpNetGet(pImage->pVDIfsImage);
3964	if (pImage->pIfNet)
3965	{
3966	/* Get configuration interface. */
3967	pImage->pIfConfig = VDIfConfigGet(pImage->pVDIfsImage);
3968	if (pImage->pIfConfig)
3969	{
3970	/* Get I/O interface. */
3971	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
3972	if (pImage->pIfIo)
3973	{
3974	/* This ISID will be adjusted later to make it unique on this host. */
3975	pImage->pszHostname = NULL;
3976	pImage->uPort = 0;
3977	pImage->Socket = NIL_VDSOCKET;
3978	pImage->ISID = 0x800000000000ULL \| 0x001234560000ULL;
3979	pImage->cISCSIRetries = 10;
3980	pImage->state = ISCSISTATE_FREE;
3981	pImage->cLoginsSinceIo = 0;
3982	pImage->Mutex = NIL_RTSEMMUTEX;
3983	pImage->MutexReqQueue = NIL_RTSEMMUTEX;
3984	pImage->pszInitiatorUsername = NULL;
3985	pImage->pbInitiatorSecret = NULL;
3986	pImage->cbInitiatorSecret = 0;
3987	pImage->pszTargetUsername = NULL;
3988	pImage->pbTargetSecret = NULL;
3989	pImage->cbTargetSecret = 0;
3990
3991	memset(pImage->aCmdsWaiting, 0, sizeof(pImage->aCmdsWaiting));
3992	pImage->cbRecvPDUResidual = 0;
3993
3994	pImage->pvRecvPDUBuf = RTMemAlloc(ISCSI_RECV_PDU_BUFFER_SIZE);
3995	pImage->cbRecvPDUBuf = ISCSI_RECV_PDU_BUFFER_SIZE;
3996	if (!pImage->pvRecvPDUBuf)
3997	rc = VERR_NO_MEMORY;
3998
3999	if (RT_SUCCESS(rc))
4000	rc = RTSemMutexCreate(&pImage->Mutex);
4001	if (RT_SUCCESS(rc))
4002	rc = RTSemMutexCreate(&pImage->MutexReqQueue);
4003	}
4004	else
4005	rc = vdIfError(pImage->pIfError, VERR_VD_UNKNOWN_INTERFACE,
4006	RT_SRC_POS, N_("iSCSI: I/O interface missing"));
4007	}
4008	else
4009	rc = vdIfError(pImage->pIfError, VERR_VD_UNKNOWN_INTERFACE,
4010	RT_SRC_POS, N_("iSCSI: configuration interface missing"));
4011	}
4012	else
4013	rc = vdIfError(pImage->pIfError, VERR_VD_UNKNOWN_INTERFACE,
4014	RT_SRC_POS, N_("iSCSI: TCP network stack interface missing"));
4015
4016	return rc;
4017	}
4018
4019	/**
4020	* Parses the user supplied config before opening the connection to the target.
4021	*
4022	* @returns VBox status code.
4023	* @param pImage The iSCSI image instance.
4024	*/
4025	static int iscsiOpenImageParseCfg(PISCSIIMAGE pImage)
4026	{
4027	char pszLUN = NULL, pszLUNInitial = NULL;
4028	bool fLunEncoded = false;
4029	uint32_t uWriteSplitDef = 0;
4030	uint32_t uTimeoutDef = 0;
4031	uint64_t uCfgTmp = 0;
4032	bool fHostIPDef = false;
4033	bool fDumpMalformedPacketsDef = false;
4034
4035	int rc = RTStrToUInt32Full(s_iscsiConfigDefaultWriteSplit, 0, &uWriteSplitDef);
4036	AssertRC(rc);
4037	rc = RTStrToUInt32Full(s_iscsiConfigDefaultTimeout, 0, &uTimeoutDef);
4038	AssertRC(rc);
4039	rc = RTStrToUInt64Full(s_iscsiConfigDefaultHostIPStack, 0, &uCfgTmp);
4040	AssertRC(rc);
4041	fHostIPDef = RT_BOOL(uCfgTmp);
4042	rc = RTStrToUInt64Full(s_iscsiConfigDefaultDumpMalformedPackets, 0, &uCfgTmp);
4043	AssertRC(rc);
4044	fDumpMalformedPacketsDef = RT_BOOL(uCfgTmp);
4045
4046	/* Validate configuration, detect unknown keys. */
4047	if (!VDCFGAreKeysValid(pImage->pIfConfig,
4048	"TargetName\0"
4049	"InitiatorName\0"
4050	"LUN\0"
4051	"TargetAddress\0"
4052	"InitiatorUsername\0"
4053	"InitiatorSecret\0"
4054	"InitiatorSecretEncrypted\0"
4055	"TargetUsername\0"
4056	"TargetSecret\0"
4057	"WriteSplit\0"
4058	"Timeout\0"
4059	"HostIPStack\0"
4060	"DumpMalformedPackets\0"))
4061	return vdIfError(pImage->pIfError, VERR_VD_UNKNOWN_CFG_VALUES, RT_SRC_POS, N_("iSCSI: configuration error: unknown configuration keys present"));
4062
4063	/* Query the iSCSI upper level configuration. */
4064	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "TargetName", &pImage->pszTargetName);
4065	if (RT_FAILURE(rc))
4066	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetName as string"));
4067
4068	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "InitiatorName", &pImage->pszInitiatorName);
4069	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
4070	pImage->fAutomaticInitiatorName = true;
4071	else if (RT_FAILURE(rc))
4072	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorName as string"));
4073
4074	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "LUN", &pszLUN);
4075	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
4076	{
4077	rc = VINF_SUCCESS;
4078	pImage->fAutomaticLUN = true;
4079	}
4080	else if (RT_FAILURE(rc))
4081	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read LUN as string"));
4082
4083	if (pImage->fAutomaticLUN)
4084	pImage->LUN = 0; /* Default to LUN 0. */
4085	else
4086	{
4087	pszLUNInitial = pszLUN;
4088	if (!strncmp(pszLUN, "enc", 3))
4089	{
4090	fLunEncoded = true;
4091	pszLUN += 3;
4092	}
4093	rc = RTStrToUInt64Full(pszLUN, 0, &pImage->LUN);
4094	if (RT_FAILURE(rc))
4095	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to convert LUN to integer"));
4096
4097	RTMemFree(pszLUNInitial);
4098	}
4099	if (RT_SUCCESS(rc) && !fLunEncoded)
4100	{
4101	if (pImage->LUN <= 255)
4102	pImage->LUN = pImage->LUN << 48; /* uses peripheral device addressing method */
4103	else if (pImage->LUN <= 16383)
4104	pImage->LUN = (pImage->LUN << 48) \| RT_BIT_64(62); /* uses flat space addressing method */
4105	else
4106	rc = vdIfError(pImage->pIfError, VERR_OUT_OF_RANGE, RT_SRC_POS, N_("iSCSI: configuration error: LUN number out of range (0-16383)"));
4107	}
4108
4109	if (RT_FAILURE(rc))
4110	return rc;
4111
4112	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "TargetAddress", &pImage->pszTargetAddress);
4113	if (RT_FAILURE(rc))
4114	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetAddress as string"));
4115
4116	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "InitiatorUsername", &pImage->pszInitiatorUsername);
4117	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND && rc != VERR_CFGM_NO_PARENT)
4118	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorUsername as string"));
4119
4120	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig, "InitiatorSecret",
4121	(void **)&pImage->pbInitiatorSecret, &pImage->cbInitiatorSecret);
4122	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND && rc != VERR_CFGM_NO_PARENT)
4123	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorSecret as byte string"));
4124
4125	void *pvInitiatorSecretEncrypted;
4126	size_t cbInitiatorSecretEncrypted;
4127	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig, "InitiatorSecretEncrypted",
4128	&pvInitiatorSecretEncrypted, &cbInitiatorSecretEncrypted);
4129	if (RT_SUCCESS(rc))
4130	{
4131	RTMemFree(pvInitiatorSecretEncrypted);
4132	if (!pImage->pbInitiatorSecret)
4133	{
4134	/* we have an encrypted initiator secret but not an unencrypted one */
4135	return vdIfError(pImage->pIfError, VERR_VD_ISCSI_SECRET_ENCRYPTED, RT_SRC_POS, N_("iSCSI: initiator secret not decrypted"));
4136	}
4137	}
4138
4139	rc = VDCFGQueryStringAlloc(pImage->pIfConfig, "TargetUsername", &pImage->pszTargetUsername);
4140	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND && rc != VERR_CFGM_NO_PARENT)
4141	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetUsername as string"));
4142
4143	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig, "TargetSecret",
4144	(void **)&pImage->pbTargetSecret, &pImage->cbTargetSecret);
4145	if (RT_FAILURE(rc) && rc != VERR_CFGM_VALUE_NOT_FOUND && rc != VERR_CFGM_NO_PARENT)
4146	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetSecret as byte string"));
4147
4148	rc = VDCFGQueryU32Def(pImage->pIfConfig, "WriteSplit", &pImage->cbWriteSplit, uWriteSplitDef);
4149	if (RT_FAILURE(rc))
4150	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read WriteSplit as U32"));
4151
4152	/* Query the iSCSI lower level configuration. */
4153	rc = VDCFGQueryU32Def(pImage->pIfConfig, "Timeout", &pImage->uReadTimeout, uTimeoutDef);
4154	if (RT_FAILURE(rc))
4155	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read Timeout as U32"));
4156
4157	rc = VDCFGQueryBoolDef(pImage->pIfConfig, "HostIPStack", &pImage->fHostIP, fHostIPDef);
4158	if (RT_FAILURE(rc))
4159	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read HostIPStack as boolean"));
4160
4161	rc = VDCFGQueryBoolDef(pImage->pIfConfig, "DumpMalformedPackets",
4162	&pImage->fDumpMalformedPackets, fDumpMalformedPacketsDef);
4163	if (RT_FAILURE(rc))
4164	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read DumpMalformedPackets as boolean"));
4165
4166	return VINF_SUCCESS;
4167	}
4168
4169	/**
4170	* Creates the necessary socket structure.
4171	*
4172	* @returns VBox status code.
4173	* @param pImage The iSCSI image instance.
4174	*/
4175	static int iscsiOpenImageSocketCreate(PISCSIIMAGE pImage)
4176	{
4177	/* Create the socket structure. */
4178	int rc = pImage->pIfNet->pfnSocketCreate(VD_INTERFACETCPNET_CONNECT_EXTENDED_SELECT,
4179	&pImage->Socket);
4180	if (RT_SUCCESS(rc))
4181	{
4182	pImage->fExtendedSelectSupported = true;
4183	pImage->fRunning = true;
4184	rc = RTThreadCreate(&pImage->hThreadIo, iscsiIoThreadWorker, pImage, 0,
4185	RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "iSCSI-Io");
4186	if (RT_FAILURE(rc))
4187	LogFunc(("Creating iSCSI I/O thread failed rc=%Rrc\n", rc));
4188	}
4189	else if (rc == VERR_NOT_SUPPORTED)
4190	{
4191	/* Async I/O is not supported without extended select. */
4192	if ((pImage->uOpenFlags & VD_OPEN_FLAGS_ASYNC_IO))
4193	LogFunc(("Extended select is not supported by the interface but async I/O is requested -> %Rrc\n", rc));
4194	else
4195	{
4196	pImage->fExtendedSelectSupported = false;
4197	rc = pImage->pIfNet->pfnSocketCreate(0, &pImage->Socket);
4198	}
4199	}
4200
4201	if (RT_FAILURE(rc))
4202	LogFunc(("Creating socket failed -> %Rrc\n", rc));
4203
4204	return rc;
4205	}
4206
4207	/**
4208	* Issues a REPORT LUNS to the target.
4209	*
4210	* @returns VBox status code.
4211	* @param pImage The iSCSI image instance.
4212	*/
4213	static int iscsiOpenImageReportLuns(PISCSIIMAGE pImage)
4214	{
4215	SCSIREQ sr;
4216	RTSGSEG DataSeg;
4217	uint8_t rlundata[16];
4218
4219	/*
4220	* Inquire available LUNs.
4221	*/
4222	RT_ZERO(sr.abCDB);
4223	sr.abCDB[0] = SCSI_REPORT_LUNS;
4224	sr.abCDB[1] = 0; /* reserved */
4225	sr.abCDB[2] = 0; /* reserved */
4226	sr.abCDB[3] = 0; /* reserved */
4227	sr.abCDB[4] = 0; /* reserved */
4228	sr.abCDB[5] = 0; /* reserved */
4229	sr.abCDB[6] = sizeof(rlundata) >> 24;
4230	sr.abCDB[7] = (sizeof(rlundata) >> 16) & 0xff;
4231	sr.abCDB[8] = (sizeof(rlundata) >> 8) & 0xff;
4232	sr.abCDB[9] = sizeof(rlundata) & 0xff;
4233	sr.abCDB[10] = 0; /* reserved */
4234	sr.abCDB[11] = 0; /* control */
4235
4236	DataSeg.pvSeg = rlundata;
4237	DataSeg.cbSeg = sizeof(rlundata);
4238
4239	sr.enmXfer = SCSIXFER_FROM_TARGET;
4240	sr.cbCDB = 12;
4241	sr.cbI2TData = 0;
4242	sr.paI2TSegs = NULL;
4243	sr.cI2TSegs = 0;
4244	sr.cbT2IData = DataSeg.cbSeg;
4245	sr.paT2ISegs = &DataSeg;
4246	sr.cT2ISegs = 1;
4247	sr.cbSense = sizeof(sr.abSense);
4248	int rc = iscsiCommandSync(pImage, &sr, false, VERR_INVALID_STATE);
4249	if (RT_FAILURE(rc))
4250	LogRel(("iSCSI: Could not get LUN info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4251
4252	/* If there is a single LUN on the target, then either verify that it matches the explicitly
4253	* configured LUN, or just use it if a LUN was not configured (defaulted to 0). For multi-LUN targets,
4254	* require a correctly configured LUN.
4255	*/
4256	uint32_t cbLuns = (rlundata[0] << 24) \| (rlundata[1] << 16) \| (rlundata[2] << 8) \| rlundata[3];
4257	unsigned cLuns = cbLuns / 8;
4258
4259	/* Dig out the first LUN. */
4260	uint64_t uTgtLun = 0;
4261	if ((rlundata[8] & 0xc0) == 0)
4262	{
4263	/* Single-byte LUN in 0-255 range. */
4264	uTgtLun = rlundata[9];
4265	}
4266	else if ((rlundata[8] & 0xc0) == 0x40)
4267	{
4268	/* Two-byte LUN in 256-16383 range. */
4269	uTgtLun = rlundata[9] \| ((rlundata[8] & 0x3f) << 8);
4270	uTgtLun = (uTgtLun << 48) \| RT_BIT_64(62);
4271	}
4272	else
4273	rc = vdIfError(pImage->pIfError, VERR_OUT_OF_RANGE, RT_SRC_POS, N_("iSCSI: Reported LUN number out of range (0-16383)"));
4274	if (RT_FAILURE(rc))
4275	return rc;
4276
4277	LogRel(("iSCSI: %u LUN(s), first LUN %RX64\n", cLuns, uTgtLun));
4278
4279	/* Convert the LUN back into the 64-bit format. */
4280	if (uTgtLun <= 255)
4281	uTgtLun = uTgtLun << 48;
4282	else
4283	{
4284	Assert(uTgtLun <= 16383);
4285	uTgtLun = (uTgtLun << 48) \| RT_BIT_64(62);
4286	}
4287
4288	if (cLuns == 1)
4289	{
4290	/* NB: It is valid to have a single LUN other than zero, at least in SPC-3. */
4291	if (pImage->fAutomaticLUN)
4292	pImage->LUN = uTgtLun;
4293	else if (pImage->LUN != uTgtLun)
4294	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE, RT_SRC_POS, N_("iSCSI: configuration error: Configured LUN does not match what target provides"));
4295	}
4296
4297	return rc;
4298	}
4299
4300	/**
4301	* Issues the INQUIRY command to the target and checks for the correct device type.
4302	*
4303	* @returns VBox status code.
4304	* @param pImage The iSCSI image instance.
4305	*/
4306	static int iscsiOpenImageInquiry(PISCSIIMAGE pImage)
4307	{
4308	SCSIREQ sr;
4309	RTSGSEG DataSeg;
4310	uint8_t data8[8];
4311
4312	/*
4313	* Inquire device characteristics - no tapes, scanners etc., please.
4314	*/
4315	RT_ZERO(sr.abCDB);
4316	sr.abCDB[0] = SCSI_INQUIRY;
4317	sr.abCDB[1] = 0; /* reserved */
4318	sr.abCDB[2] = 0; /* reserved */
4319	sr.abCDB[3] = 0; /* reserved */
4320	sr.abCDB[4] = sizeof(data8);
4321	sr.abCDB[5] = 0; /* control */
4322
4323	DataSeg.pvSeg = data8;
4324	DataSeg.cbSeg = sizeof(data8);
4325
4326	sr.enmXfer = SCSIXFER_FROM_TARGET;
4327	sr.cbCDB = 6;
4328	sr.cbI2TData = 0;
4329	sr.paI2TSegs = NULL;
4330	sr.cI2TSegs = 0;
4331	sr.cbT2IData = DataSeg.cbSeg;
4332	sr.paT2ISegs = &DataSeg;
4333	sr.cT2ISegs = 1;
4334	sr.cbSense = sizeof(sr.abSense);
4335	int rc = iscsiCommandSync(pImage, &sr, true /* fRetry */, VERR_INVALID_STATE);
4336	if (RT_SUCCESS(rc))
4337	{
4338	uint8_t devType = (sr.cbT2IData > 0) ? data8[0] & SCSI_DEVTYPE_MASK : 255;
4339	if (devType == SCSI_DEVTYPE_DISK)
4340	{
4341	uint8_t uCmdQueue = (sr.cbT2IData >= 8) ? data8[7] & SCSI_INQUIRY_CMDQUE_MASK : 0;
4342	if (uCmdQueue > 0)
4343	pImage->fCmdQueuingSupported = true;
4344	else if (pImage->uOpenFlags & VD_OPEN_FLAGS_ASYNC_IO)
4345	rc = VERR_NOT_SUPPORTED;
4346	else
4347	LogRel(("iSCSI: target address %s, target name %s, %s command queuing\n",
4348	pImage->pszTargetAddress, pImage->pszTargetName,
4349	pImage->fCmdQueuingSupported ? "supports" : "doesn't support"));
4350	}
4351	else
4352	{
4353	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4354	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports device type=%u"),
4355	pImage->pszTargetAddress, pImage->pszTargetName,
4356	pImage->LUN, devType);
4357	LogRel(("iSCSI: Unsupported SCSI peripheral device type %d for target %s\n", devType & SCSI_DEVTYPE_MASK, pImage->pszTargetName));
4358	}
4359	}
4360	else
4361	LogRel(("iSCSI: Could not get INQUIRY info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4362
4363	return rc;
4364	}
4365
4366	/**
4367	* Checks that the target allows write access if the caller requested it.
4368	*
4369	* @returns VBox status code.
4370	* @param pImage The iSCSI image instance.
4371	*/
4372	static int iscsiOpenImageCheckWriteAccess(PISCSIIMAGE pImage)
4373	{
4374	SCSIREQ sr;
4375	RTSGSEG DataSeg;
4376	uint8_t data4[4];
4377
4378	/*
4379	* Query write disable bit in the device specific parameter entry in the
4380	* mode parameter header. Refuse read/write opening of read only disks.
4381	*/
4382	RT_ZERO(sr.abCDB);
4383	sr.abCDB[0] = SCSI_MODE_SENSE_6;
4384	sr.abCDB[1] = 0; /* dbd=0/reserved */
4385	sr.abCDB[2] = 0x3f; /* pc=0/page code=0x3f, ask for all pages */
4386	sr.abCDB[3] = 0; /* subpage code=0, return everything in page_0 format */
4387	sr.abCDB[4] = sizeof(data4); /* allocation length=4 */
4388	sr.abCDB[5] = 0; /* control */
4389
4390	DataSeg.pvSeg = data4;
4391	DataSeg.cbSeg = sizeof(data4);
4392
4393	sr.enmXfer = SCSIXFER_FROM_TARGET;
4394	sr.cbCDB = 6;
4395	sr.cbI2TData = 0;
4396	sr.paI2TSegs = NULL;
4397	sr.cI2TSegs = 0;
4398	sr.cbT2IData = DataSeg.cbSeg;
4399	sr.paT2ISegs = &DataSeg;
4400	sr.cT2ISegs = 1;
4401	sr.cbSense = sizeof(sr.abSense);
4402	int rc = iscsiCommandSync(pImage, &sr, true /* fRetry */, VERR_INVALID_STATE);
4403	if (RT_SUCCESS(rc))
4404	{
4405	pImage->fTargetReadOnly = !!(data4[2] & 0x80);
4406	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) && pImage->fTargetReadOnly)
4407	rc = VERR_VD_IMAGE_READ_ONLY;
4408	}
4409	else
4410	LogRel(("iSCSI: Could not get MODE SENSE info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4411
4412	return rc;
4413	}
4414
4415	/**
4416	* Queries the media and sector size of the target.
4417	*
4418	* @returns VBox status code.
4419	* @param pImage The iSCSI image instance.
4420	*/
4421	static int iscsiOpenImageQueryTargetSizes(PISCSIIMAGE pImage)
4422	{
4423	SCSIREQ sr;
4424	RTSGSEG DataSeg;
4425	uint8_t data12[12];
4426
4427	/*
4428	* Determine sector size and capacity of the volume immediately.
4429	*/
4430	RT_ZERO(data12);
4431	RT_ZERO(sr.abCDB);
4432	sr.abCDB[0] = SCSI_SERVICE_ACTION_IN_16;
4433	sr.abCDB[1] = SCSI_SVC_ACTION_IN_READ_CAPACITY_16; /* subcommand */
4434	sr.abCDB[10+3] = sizeof(data12); /* allocation length (dword) */
4435
4436	DataSeg.pvSeg = data12;
4437	DataSeg.cbSeg = sizeof(data12);
4438
4439	sr.enmXfer = SCSIXFER_FROM_TARGET;
4440	sr.cbCDB = 16;
4441	sr.cbI2TData = 0;
4442	sr.paI2TSegs = NULL;
4443	sr.cI2TSegs = 0;
4444	sr.cbT2IData = DataSeg.cbSeg;
4445	sr.paT2ISegs = &DataSeg;
4446	sr.cT2ISegs = 1;
4447	sr.cbSense = sizeof(sr.abSense);
4448
4449	int rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4450	if (RT_SUCCESS(rc))
4451	{
4452	bool fEnd = false;
4453	uint8_t cMaxRetries = 10;
4454	do
4455	{
4456	switch (sr.status)
4457	{
4458	case SCSI_STATUS_OK:
4459	{
4460	pImage->cVolume = RT_BE2H_U64((uint64_t )&data12[0]);
4461	pImage->cVolume++;
4462	pImage->cbSector = RT_BE2H_U32((uint32_t )&data12[8]);
4463	pImage->cbSize = pImage->cVolume * pImage->cbSector;
4464	if (pImage->cVolume == 0 \|\| pImage->cbSize < pImage->cVolume)
4465	{
4466	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4467	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports media sector count=%llu sector size=%u"),
4468	pImage->pszTargetAddress, pImage->pszTargetName,
4469	pImage->LUN, pImage->cVolume, pImage->cbSector);
4470	}
4471	fEnd = true;
4472	break;
4473	}
4474	case SCSI_STATUS_CHECK_CONDITION:
4475	{
4476	if((sr.abSense[2] & 0x0f) == SCSI_SENSE_UNIT_ATTENTION)
4477	{
4478	if( sr.abSense[12] == SCSI_ASC_POWER_ON_RESET_BUS_DEVICE_RESET_OCCURRED
4479	&& sr.abSense[13] == SCSI_ASCQ_POWER_ON_RESET_BUS_DEVICE_RESET_OCCURRED)
4480	{
4481	/** @todo for future: prepare and send command "REQUEST SENSE" which will
4482	* return the status of target and will clear any unit attention
4483	* condition that it reports */
4484	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4485	if (RT_FAILURE(rc))
4486	fEnd = true;
4487	cMaxRetries--;
4488	break;
4489	}
4490	}
4491	break;
4492	}
4493	default:
4494	{
4495	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4496	if (RT_FAILURE(rc))
4497	fEnd = true;
4498	cMaxRetries--;
4499	break;
4500	}
4501	}
4502	if (!cMaxRetries)
4503	fEnd = true;
4504	} while(!fEnd);
4505	}
4506	else
4507	{
4508	uint8_t data8[8];
4509
4510	RT_ZERO(data8);
4511	sr.abCDB[0] = SCSI_READ_CAPACITY;
4512	sr.abCDB[1] = 0; /* reserved */
4513	sr.abCDB[2] = 0; /* reserved */
4514	sr.abCDB[3] = 0; /* reserved */
4515	sr.abCDB[4] = 0; /* reserved */
4516	sr.abCDB[5] = 0; /* reserved */
4517	sr.abCDB[6] = 0; /* reserved */
4518	sr.abCDB[7] = 0; /* reserved */
4519	sr.abCDB[8] = 0; /* reserved */
4520	sr.abCDB[9] = 0; /* control */
4521
4522	DataSeg.pvSeg = data8;
4523	DataSeg.cbSeg = sizeof(data8);
4524
4525	sr.enmXfer = SCSIXFER_FROM_TARGET;
4526	sr.cbCDB = 10;
4527	sr.cbI2TData = 0;
4528	sr.paI2TSegs = NULL;
4529	sr.cI2TSegs = 0;
4530	sr.cbT2IData = DataSeg.cbSeg;
4531	sr.paT2ISegs = &DataSeg;
4532	sr.cT2ISegs = 1;
4533	sr.cbSense = sizeof(sr.abSense);
4534	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4535	if (RT_SUCCESS(rc))
4536	{
4537	bool fEnd = false;
4538	uint8_t cMaxRetries = 10;
4539	do
4540	{
4541	switch (sr.status)
4542	{
4543	case SCSI_STATUS_OK:
4544	{
4545	pImage->cVolume = (data8[0] << 24) \| (data8[1] << 16) \| (data8[2] << 8) \| data8[3];
4546	pImage->cVolume++;
4547	pImage->cbSector = (data8[4] << 24) \| (data8[5] << 16) \| (data8[6] << 8) \| data8[7];
4548	pImage->cbSize = pImage->cVolume * pImage->cbSector;
4549	if (pImage->cVolume == 0)
4550	{
4551	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4552	RT_SRC_POS, N_("iSCSI: fallback capacity detection for target address %s, target name %s, SCSI LUN %lld reports media sector count=%llu sector size=%u"),
4553	pImage->pszTargetAddress, pImage->pszTargetName,
4554	pImage->LUN, pImage->cVolume, pImage->cbSector);
4555	}
4556
4557	fEnd = true;
4558	break;
4559	}
4560	case SCSI_STATUS_CHECK_CONDITION:
4561	{
4562	if((sr.abSense[2] & 0x0f) == SCSI_SENSE_UNIT_ATTENTION)
4563	{
4564	if( sr.abSense[12] == SCSI_ASC_POWER_ON_RESET_BUS_DEVICE_RESET_OCCURRED
4565	&& sr.abSense[13] == SCSI_ASCQ_POWER_ON_RESET_BUS_DEVICE_RESET_OCCURRED)
4566	{
4567	/** @todo for future: prepare and send command "REQUEST SENSE" which will
4568	* return the status of target and will clear any unit attention
4569	* condition that it reports */
4570	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4571	if (RT_FAILURE(rc))
4572	fEnd = true;
4573	cMaxRetries--;
4574	break;
4575
4576	}
4577	}
4578	break;
4579	}
4580	default:
4581	{
4582	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4583	if (RT_FAILURE(rc))
4584	fEnd = true;
4585	cMaxRetries--;
4586	break;
4587	}
4588	}
4589	if (!cMaxRetries)
4590	fEnd = true;
4591	} while(!fEnd);
4592	}
4593	else
4594	LogRel(("iSCSI: Could not determine capacity of target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4595	}
4596
4597	return rc;
4598	}
4599
4600	/**
4601	* Queries the state of the read/write caches and tries to enable them if disabled.
4602	*
4603	* @returns VBox status code.
4604	* @param pImage The iSCSI image instance.
4605	*/
4606	static int iscsiOpenImageEnableReadWriteCache(PISCSIIMAGE pImage)
4607	{
4608	/*
4609	* Check the read and write cache bits.
4610	* Try to enable the cache if it is disabled.
4611	*
4612	* We already checked that this is a block access device. No need
4613	* to do it again.
4614	*/
4615	SCSIREQ sr;
4616	RTSGSEG DataSeg;
4617	uint8_t aCachingModePage[32];
4618
4619	memset(aCachingModePage, '\0', sizeof(aCachingModePage));
4620	sr.abCDB[0] = SCSI_MODE_SENSE_6;
4621	sr.abCDB[1] = 0;
4622	sr.abCDB[2] = (0x00 << 6) \| (0x08 & 0x3f); /* Current values and caching mode page */
4623	sr.abCDB[3] = 0; /* Sub page code. */
4624	sr.abCDB[4] = sizeof(aCachingModePage) & 0xff;
4625	sr.abCDB[5] = 0;
4626
4627	DataSeg.pvSeg = aCachingModePage;
4628	DataSeg.cbSeg = sizeof(aCachingModePage);
4629
4630	sr.enmXfer = SCSIXFER_FROM_TARGET;
4631	sr.cbCDB = 6;
4632	sr.cbI2TData = 0;
4633	sr.paI2TSegs = NULL;
4634	sr.cI2TSegs = 0;
4635	sr.cbT2IData = DataSeg.cbSeg;
4636	sr.paT2ISegs = &DataSeg;
4637	sr.cT2ISegs = 1;
4638	sr.cbSense = sizeof(sr.abSense);
4639	int rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4640	if ( RT_SUCCESS(rc)
4641	&& (sr.status == SCSI_STATUS_OK)
4642	&& (aCachingModePage[0] >= 15)
4643	&& (aCachingModePage[4 + aCachingModePage[3]] & 0x3f) == 0x08
4644	&& (aCachingModePage[4 + aCachingModePage[3] + 1] > 3))
4645	{
4646	uint32_t Offset = 4 + aCachingModePage[3];
4647	/*
4648	* Check if the read and/or the write cache is disabled.
4649	* The write cache is disabled if bit 2 (WCE) is zero and
4650	* the read cache is disabled if bit 0 (RCD) is set.
4651	*/
4652	if (!ASMBitTest(&aCachingModePage[Offset + 2], 2) \|\| ASMBitTest(&aCachingModePage[Offset + 2], 0))
4653	{
4654	/*
4655	* Write Cache Enable (WCE) bit is zero or the Read Cache Disable (RCD) is one
4656	* So one of the caches is disabled. Enable both caches.
4657	* The rest is unchanged.
4658	*/
4659	ASMBitSet(&aCachingModePage[Offset + 2], 2);
4660	ASMBitClear(&aCachingModePage[Offset + 2], 0);
4661
4662	sr.abCDB[0] = SCSI_MODE_SELECT_6;
4663	sr.abCDB[1] = 0; /* Don't write the page into NV RAM. */
4664	sr.abCDB[2] = 0;
4665	sr.abCDB[3] = 0;
4666	sr.abCDB[4] = sizeof(aCachingModePage) & 0xff;
4667	sr.abCDB[5] = 0;
4668
4669	DataSeg.pvSeg = aCachingModePage;
4670	DataSeg.cbSeg = sizeof(aCachingModePage);
4671
4672	sr.enmXfer = SCSIXFER_TO_TARGET;
4673	sr.cbCDB = 6;
4674	sr.cbI2TData = DataSeg.cbSeg;
4675	sr.paI2TSegs = &DataSeg;
4676	sr.cI2TSegs = 1;
4677	sr.cbT2IData = 0;
4678	sr.paT2ISegs = NULL;
4679	sr.cT2ISegs = 0;
4680	sr.cbSense = sizeof(sr.abSense);
4681	sr.status = 0;
4682	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4683	if ( RT_SUCCESS(rc)
4684	&& (sr.status == SCSI_STATUS_OK))
4685	LogRel(("iSCSI: Enabled read and write cache of target %s\n", pImage->pszTargetName));
4686	else
4687	{
4688	/* Log failures but continue. */
4689	LogRel(("iSCSI: Could not enable read and write cache of target %s, rc=%Rrc status=%#x\n",
4690	pImage->pszTargetName, rc, sr.status));
4691	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sr.abSense));
4692	rc = VINF_SUCCESS;
4693	}
4694	}
4695	}
4696	else
4697	{
4698	/* Log errors but continue. */
4699	LogRel(("iSCSI: Could not check write cache of target %s, rc=%Rrc, got mode page %#x\n", pImage->pszTargetName, rc, aCachingModePage[0] & 0x3f));
4700	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sr.abSense));
4701	rc = VINF_SUCCESS;
4702	}
4703
4704	return rc;
4705	}
4706
4707	/**
4708	* Internal: Open an image, constructing all necessary data structures.
4709	*/
4710	static int iscsiOpenImage(PISCSIIMAGE pImage, unsigned uOpenFlags)
4711	{
4712	pImage->uOpenFlags = uOpenFlags;
4713
4714	int rc = iscsiOpenImageInit(pImage);
4715	if (RT_SUCCESS(rc))
4716	rc = iscsiOpenImageParseCfg(pImage);
4717
4718	if (RT_SUCCESS(rc))
4719	{
4720	/* Don't actually establish iSCSI transport connection if this is just an
4721	* open to query the image information and the host IP stack isn't used.
4722	* Even trying is rather useless, as in this context the InTnet IP stack
4723	* isn't present. Returning dummies is the best possible result anyway. */
4724	if ((uOpenFlags & VD_OPEN_FLAGS_INFO) && !pImage->fHostIP)
4725	LogFunc(("Not opening the transport connection as IntNet IP stack is not available. Will return dummies\n"));
4726	else
4727	{
4728	rc = iscsiOpenImageSocketCreate(pImage);
4729	if (RT_SUCCESS(rc))
4730	{
4731	/*
4732	* Attach to the iSCSI target. This implicitly establishes the iSCSI
4733	* transport connection.
4734	*/
4735	rc = iscsiExecSync(pImage, iscsiAttach, pImage);
4736	if (RT_SUCCESS(rc))
4737	{
4738	LogFlowFunc(("target '%s' opened successfully\n", pImage->pszTargetName));
4739
4740	rc = iscsiOpenImageReportLuns(pImage);
4741	if (RT_SUCCESS(rc))
4742	rc = iscsiOpenImageInquiry(pImage);
4743	if (RT_SUCCESS(rc))
4744	rc = iscsiOpenImageCheckWriteAccess(pImage);
4745	if (RT_SUCCESS(rc))
4746	rc = iscsiOpenImageQueryTargetSizes(pImage);
4747	if (RT_SUCCESS(rc))
4748	rc = iscsiOpenImageEnableReadWriteCache(pImage);
4749	}
4750	else
4751	LogRel(("iSCSI: could not open target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4752	}
4753	}
4754	}
4755
4756	if (RT_SUCCESS(rc))
4757	{
4758	PVDREGIONDESC pRegion = &pImage->RegionList.aRegions[0];
4759	pImage->RegionList.fFlags = 0;
4760	pImage->RegionList.cRegions = 1;
4761
4762	pRegion->offRegion = 0; /* Disk start. */
4763	pRegion->cbBlock = pImage->cbSector;
4764	pRegion->enmDataForm = VDREGIONDATAFORM_RAW;
4765	pRegion->enmMetadataForm = VDREGIONMETADATAFORM_NONE;
4766	pRegion->cbData = pImage->cbSector;
4767	pRegion->cbMetadata = 0;
4768	pRegion->cRegionBlocksOrBytes = pImage->cbSize;
4769	}
4770	else
4771	iscsiFreeImage(pImage, false);
4772	return rc;
4773	}
4774
4775
4776	/** @copydoc VDIMAGEBACKEND::pfnProbe */
4777	static DECLCALLBACK(int) iscsiProbe(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
4778	PVDINTERFACE pVDIfsImage, VDTYPE enmDesiredType, VDTYPE *penmType)
4779	{
4780	RT_NOREF(pszFilename, pVDIfsDisk, pVDIfsImage, enmDesiredType, penmType);
4781	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
4782
4783	/* iSCSI images can't be checked for validity this way, as the filename
4784	* just can't supply enough configuration information. */
4785	int rc = VERR_VD_ISCSI_INVALID_HEADER;
4786
4787	LogFlowFunc(("returns %Rrc\n", rc));
4788	return rc;
4789	}
4790
4791	/** @copydoc VDIMAGEBACKEND::pfnOpen */
4792	static DECLCALLBACK(int) iscsiOpen(const char *pszFilename, unsigned uOpenFlags,
4793	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
4794	VDTYPE enmType, void **ppBackendData)
4795	{
4796	RT_NOREF1(enmType); /*< @todo r=klaus make use of the type info. /
4797
4798	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p enmType=%u ppBackendData=%#p\n",
4799	pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, enmType, ppBackendData));
4800	int rc;
4801
4802	/* Check open flags. All valid flags are supported. */
4803	AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
4804	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
4805	AssertReturn(*pszFilename != '\0', VERR_INVALID_PARAMETER);
4806
4807	PISCSIIMAGE pImage = (PISCSIIMAGE)RTMemAllocZ(RT_UOFFSETOF(ISCSIIMAGE, RegionList.aRegions[1]));
4808	if (RT_LIKELY(pImage))
4809	{
4810	pImage->pszFilename = pszFilename;
4811	pImage->pszInitiatorName = NULL;
4812	pImage->pszTargetName = NULL;
4813	pImage->pszTargetAddress = NULL;
4814	pImage->pszInitiatorUsername = NULL;
4815	pImage->pbInitiatorSecret = NULL;
4816	pImage->pszTargetUsername = NULL;
4817	pImage->pbTargetSecret = NULL;
4818	pImage->paCurrReq = NULL;
4819	pImage->pvRecvPDUBuf = NULL;
4820	pImage->pszHostname = NULL;
4821	pImage->pVDIfsDisk = pVDIfsDisk;
4822	pImage->pVDIfsImage = pVDIfsImage;
4823	pImage->cLogRelErrors = 0;
4824
4825	rc = iscsiOpenImage(pImage, uOpenFlags);
4826	if (RT_SUCCESS(rc))
4827	{
4828	LogFlowFunc(("target %s cVolume %d, cbSector %d\n", pImage->pszTargetName, pImage->cVolume, pImage->cbSector));
4829	LogRel(("iSCSI: target address %s, target name %s, SCSI LUN %lld\n", pImage->pszTargetAddress, pImage->pszTargetName, pImage->LUN));
4830	*ppBackendData = pImage;
4831	}
4832	else
4833	RTMemFree(pImage);
4834	}
4835	else
4836	rc = VERR_NO_MEMORY;
4837
4838	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
4839	return rc;
4840	}
4841
4842	/** @copydoc VDIMAGEBACKEND::pfnCreate */
4843	static DECLCALLBACK(int) iscsiCreate(const char *pszFilename, uint64_t cbSize,
4844	unsigned uImageFlags, const char *pszComment,
4845	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
4846	PCRTUUID pUuid, unsigned uOpenFlags,
4847	unsigned uPercentStart, unsigned uPercentSpan,
4848	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
4849	PVDINTERFACE pVDIfsOperation, VDTYPE enmType,
4850	void **ppBackendData)
4851	{
4852	RT_NOREF8(pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags);
4853	RT_NOREF7(uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData);
4854	LogFlowFunc(("pszFilename=\"%s\" cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p enmType=%u ppBackendData=%#p",
4855	pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData));
4856	int rc = VERR_NOT_SUPPORTED;
4857
4858	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
4859	return rc;
4860	}
4861
4862	/** @copydoc VDIMAGEBACKEND::pfnClose */
4863	static DECLCALLBACK(int) iscsiClose(void *pBackendData, bool fDelete)
4864	{
4865	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
4866	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4867	int rc;
4868
4869	Assert(!fDelete); /* This flag is unsupported. */
4870
4871	rc = iscsiFreeImage(pImage, fDelete);
4872	RTMemFree(pImage);
4873
4874	LogFlowFunc(("returns %Rrc\n", rc));
4875	return rc;
4876	}
4877
4878	/** @copydoc VDIMAGEBACKEND::pfnRead */
4879	static DECLCALLBACK(int) iscsiRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
4880	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
4881	{
4882	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4883	int rc = VINF_SUCCESS;
4884
4885	LogFlowFunc(("pBackendData=%p uOffset=%#llx pIoCtx=%#p cbToRead=%u pcbActuallyRead=%p\n",
4886	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
4887
4888	if ( uOffset + cbToRead > pImage->cbSize
4889	\|\| cbToRead == 0)
4890	return VERR_INVALID_PARAMETER;
4891
4892	/*
4893	* Clip read size to a value which is supported by the target.
4894	*/
4895	cbToRead = RT_MIN(cbToRead, pImage->cbRecvDataLength);
4896
4897	unsigned cT2ISegs = 0;
4898	size_t cbSegs = 0;
4899
4900	/* Get the number of segments. */
4901	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
4902	NULL, &cT2ISegs, cbToRead);
4903	Assert(cbSegs == cbToRead);
4904
4905	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(RT_UOFFSETOF_DYN(SCSIREQ, aSegs[cT2ISegs]));
4906	if (RT_LIKELY(pReq))
4907	{
4908	uint64_t lba;
4909	uint16_t tls;
4910	uint8_t *pbCDB = &pReq->abCDB[0];
4911	size_t cbCDB;
4912
4913	lba = uOffset / pImage->cbSector;
4914	tls = (uint16_t)(cbToRead / pImage->cbSector);
4915
4916	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
4917	&pReq->aSegs[0],
4918	&cT2ISegs, cbToRead);
4919	Assert(cbSegs == cbToRead);
4920
4921	if (pImage->cVolume < _4G)
4922	{
4923	cbCDB = 10;
4924	pbCDB[0] = SCSI_READ_10;
4925	pbCDB[1] = 0; /* reserved */
4926	pbCDB[2] = (lba >> 24) & 0xff;
4927	pbCDB[3] = (lba >> 16) & 0xff;
4928	pbCDB[4] = (lba >> 8) & 0xff;
4929	pbCDB[5] = lba & 0xff;
4930	pbCDB[6] = 0; /* reserved */
4931	pbCDB[7] = (tls >> 8) & 0xff;
4932	pbCDB[8] = tls & 0xff;
4933	pbCDB[9] = 0; /* control */
4934	}
4935	else
4936	{
4937	cbCDB = 16;
4938	pbCDB[0] = SCSI_READ_16;
4939	pbCDB[1] = 0; /* reserved */
4940	pbCDB[2] = (lba >> 56) & 0xff;
4941	pbCDB[3] = (lba >> 48) & 0xff;
4942	pbCDB[4] = (lba >> 40) & 0xff;
4943	pbCDB[5] = (lba >> 32) & 0xff;
4944	pbCDB[6] = (lba >> 24) & 0xff;
4945	pbCDB[7] = (lba >> 16) & 0xff;
4946	pbCDB[8] = (lba >> 8) & 0xff;
4947	pbCDB[9] = lba & 0xff;
4948	pbCDB[10] = 0; /* tls unused */
4949	pbCDB[11] = 0; /* tls unused */
4950	pbCDB[12] = (tls >> 8) & 0xff;
4951	pbCDB[13] = tls & 0xff;
4952	pbCDB[14] = 0; /* reserved */
4953	pbCDB[15] = 0; /* reserved */
4954	}
4955
4956	pReq->enmXfer = SCSIXFER_FROM_TARGET;
4957	pReq->cbCDB = cbCDB;
4958	pReq->cbI2TData = 0;
4959	pReq->paI2TSegs = NULL;
4960	pReq->cI2TSegs = 0;
4961	pReq->cbT2IData = cbToRead;
4962	pReq->paT2ISegs = &pReq->aSegs[pReq->cI2TSegs];
4963	pReq->cbSense = sizeof(pReq->abSense);
4964	pReq->cT2ISegs = cT2ISegs;
4965	pReq->pIoCtx = pIoCtx;
4966	pReq->cSenseRetries = 10;
4967	pReq->rcSense = VERR_READ_ERROR;
4968
4969	if (vdIfIoIntIoCtxIsSynchronous(pImage->pIfIo, pIoCtx))
4970	{
4971	rc = iscsiCommandSync(pImage, pReq, true, VERR_READ_ERROR);
4972	if (RT_FAILURE(rc))
4973	{
4974	LogFlow(("iscsiCommandSync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
4975	*pcbActuallyRead = 0;
4976	}
4977	else
4978	*pcbActuallyRead = pReq->cbT2IData;
4979	}
4980	else
4981	{
4982	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReq);
4983	if (RT_FAILURE(rc))
4984	AssertMsgFailed(("iscsiCommandAsync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
4985	else
4986	{
4987	*pcbActuallyRead = cbToRead;
4988	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
4989	}
4990	}
4991
4992	RTMemFree(pReq);
4993	}
4994	else
4995	rc = VERR_NO_MEMORY;
4996
4997	LogFlowFunc(("returns rc=%Rrc\n", rc));
4998	return rc;
4999	}
5000
5001	/** @copydoc VDIMAGEBACKEND::pfnWrite */
5002	static DECLCALLBACK(int) iscsiWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
5003	PVDIOCTX pIoCtx, size_t pcbWriteProcess, size_t pcbPreRead,
5004	size_t *pcbPostRead, unsigned fWrite)
5005	{
5006	RT_NOREF3(pcbPreRead, pcbPostRead, fWrite);
5007	LogFlowFunc(("pBackendData=%p uOffset=%llu pIoCtx=%#p cbToWrite=%u pcbWriteProcess=%p pcbPreRead=%p pcbPostRead=%p fWrite=%u\n",
5008	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead, fWrite));
5009	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5010	int rc = VINF_SUCCESS;
5011
5012	AssertPtr(pImage);
5013	Assert(uOffset % 512 == 0);
5014	Assert(cbToWrite % 512 == 0);
5015
5016	if (uOffset + cbToWrite > pImage->cbSize)
5017	return VERR_INVALID_PARAMETER;
5018
5019	/*
5020	* Clip read size to a value which is supported by the target.
5021	*/
5022	cbToWrite = RT_MIN(cbToWrite, pImage->cbSendDataLength);
5023
5024	unsigned cI2TSegs = 0;
5025	size_t cbSegs = 0;
5026
5027	/* Get the number of segments. */
5028	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5029	NULL, &cI2TSegs, cbToWrite);
5030	Assert(cbSegs == cbToWrite);
5031
5032	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(RT_UOFFSETOF_DYN(SCSIREQ, aSegs[cI2TSegs]));
5033	if (RT_LIKELY(pReq))
5034	{
5035	uint64_t lba;
5036	uint16_t tls;
5037	uint8_t *pbCDB = &pReq->abCDB[0];
5038	size_t cbCDB;
5039
5040	lba = uOffset / pImage->cbSector;
5041	tls = (uint16_t)(cbToWrite / pImage->cbSector);
5042
5043	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5044	&pReq->aSegs[0],
5045	&cI2TSegs, cbToWrite);
5046	Assert(cbSegs == cbToWrite);
5047
5048	if (pImage->cVolume < _4G)
5049	{
5050	cbCDB = 10;
5051	pbCDB[0] = SCSI_WRITE_10;
5052	pbCDB[1] = 0; /* reserved */
5053	pbCDB[2] = (lba >> 24) & 0xff;
5054	pbCDB[3] = (lba >> 16) & 0xff;
5055	pbCDB[4] = (lba >> 8) & 0xff;
5056	pbCDB[5] = lba & 0xff;
5057	pbCDB[6] = 0; /* reserved */
5058	pbCDB[7] = (tls >> 8) & 0xff;
5059	pbCDB[8] = tls & 0xff;
5060	pbCDB[9] = 0; /* control */
5061	}
5062	else
5063	{
5064	cbCDB = 16;
5065	pbCDB[0] = SCSI_WRITE_16;
5066	pbCDB[1] = 0; /* reserved */
5067	pbCDB[2] = (lba >> 56) & 0xff;
5068	pbCDB[3] = (lba >> 48) & 0xff;
5069	pbCDB[4] = (lba >> 40) & 0xff;
5070	pbCDB[5] = (lba >> 32) & 0xff;
5071	pbCDB[6] = (lba >> 24) & 0xff;
5072	pbCDB[7] = (lba >> 16) & 0xff;
5073	pbCDB[8] = (lba >> 8) & 0xff;
5074	pbCDB[9] = lba & 0xff;
5075	pbCDB[10] = 0; /* tls unused */
5076	pbCDB[11] = 0; /* tls unused */
5077	pbCDB[12] = (tls >> 8) & 0xff;
5078	pbCDB[13] = tls & 0xff;
5079	pbCDB[14] = 0; /* reserved */
5080	pbCDB[15] = 0; /* reserved */
5081	}
5082
5083	pReq->enmXfer = SCSIXFER_TO_TARGET;
5084	pReq->cbCDB = cbCDB;
5085	pReq->cbI2TData = cbToWrite;
5086	pReq->paI2TSegs = &pReq->aSegs[0];
5087	pReq->cI2TSegs = cI2TSegs;
5088	pReq->cbT2IData = 0;
5089	pReq->paT2ISegs = NULL;
5090	pReq->cT2ISegs = 0;
5091	pReq->cbSense = sizeof(pReq->abSense);
5092	pReq->pIoCtx = pIoCtx;
5093	pReq->cSenseRetries = 10;
5094	pReq->rcSense = VERR_WRITE_ERROR;
5095
5096	if (vdIfIoIntIoCtxIsSynchronous(pImage->pIfIo, pIoCtx))
5097	{
5098	rc = iscsiCommandSync(pImage, pReq, true, VERR_WRITE_ERROR);
5099	if (RT_FAILURE(rc))
5100	{
5101	LogFlow(("iscsiCommandSync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
5102	*pcbWriteProcess = 0;
5103	}
5104	else
5105	*pcbWriteProcess = cbToWrite;
5106	}
5107	else
5108	{
5109	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReq);
5110	if (RT_FAILURE(rc))
5111	AssertMsgFailed(("iscsiCommandAsync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
5112	else
5113	{
5114	*pcbWriteProcess = cbToWrite;
5115	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5116	}
5117	}
5118
5119	RTMemFree(pReq);
5120	}
5121	else
5122	rc = VERR_NO_MEMORY;
5123
5124	LogFlowFunc(("returns rc=%Rrc\n", rc));
5125	return rc;
5126	}
5127
5128	/** @copydoc VDIMAGEBACKEND::pfnFlush */
5129	static DECLCALLBACK(int) iscsiFlush(void *pBackendData, PVDIOCTX pIoCtx)
5130	{
5131	LogFlowFunc(("pBackendData=%p pIoCtx=%#p\n", pBackendData, pIoCtx));
5132	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5133	int rc = VINF_SUCCESS;
5134
5135	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(sizeof(SCSIREQ));
5136	if (RT_LIKELY(pReq))
5137	{
5138	uint8_t *pbCDB = &pReq->abCDB[0];
5139
5140	pbCDB[0] = SCSI_SYNCHRONIZE_CACHE;
5141	pbCDB[1] = 0; /* reserved */
5142	pbCDB[2] = 0; /* reserved */
5143	pbCDB[3] = 0; /* reserved */
5144	pbCDB[4] = 0; /* reserved */
5145	pbCDB[5] = 0; /* reserved */
5146	pbCDB[6] = 0; /* reserved */
5147	pbCDB[7] = 0; /* reserved */
5148	pbCDB[8] = 0; /* reserved */
5149	pbCDB[9] = 0; /* control */
5150
5151	pReq->enmXfer = SCSIXFER_NONE;
5152	pReq->cbCDB = 10;
5153	pReq->cbI2TData = 0;
5154	pReq->paI2TSegs = NULL;
5155	pReq->cI2TSegs = 0;
5156	pReq->cbT2IData = 0;
5157	pReq->paT2ISegs = NULL;
5158	pReq->cT2ISegs = 0;
5159	pReq->cbSense = sizeof(pReq->abSense);
5160	pReq->pIoCtx = pIoCtx;
5161	pReq->cSenseRetries = 0;
5162	pReq->rcSense = VINF_SUCCESS;
5163
5164	if (vdIfIoIntIoCtxIsSynchronous(pImage->pIfIo, pIoCtx))
5165	{
5166	rc = iscsiCommandSync(pImage, pReq, false, VINF_SUCCESS);
5167	if (RT_FAILURE(rc))
5168	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
5169	}
5170	else
5171	{
5172	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReq);
5173	if (RT_FAILURE(rc))
5174	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
5175	else
5176	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5177	}
5178
5179	RTMemFree(pReq);
5180	}
5181	else
5182	rc = VERR_NO_MEMORY;
5183
5184	LogFlowFunc(("returns rc=%Rrc\n", rc));
5185	return rc;
5186	}
5187
5188	/** @copydoc VDIMAGEBACKEND::pfnGetVersion */
5189	static DECLCALLBACK(unsigned) iscsiGetVersion(void *pBackendData)
5190	{
5191	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
5192	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5193
5194	AssertPtr(pImage);
5195	RT_NOREF1(pImage);
5196
5197	return 0;
5198	}
5199
5200	/** @copydoc VDIMAGEBACKEND::pfnGetFileSize */
5201	static DECLCALLBACK(uint64_t) iscsiGetFileSize(void *pBackendData)
5202	{
5203	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
5204	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5205
5206	AssertPtrReturn(pImage, 0);
5207
5208	return pImage->cbSize;
5209	}
5210
5211	/** @copydoc VDIMAGEBACKEND::pfnGetPCHSGeometry */
5212	static DECLCALLBACK(int) iscsiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
5213	{
5214	RT_NOREF1(pPCHSGeometry);
5215	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
5216	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5217
5218	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5219
5220	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", VERR_VD_GEOMETRY_NOT_SET,
5221	pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
5222	return VERR_VD_GEOMETRY_NOT_SET;
5223	}
5224
5225	/** @copydoc VDIMAGEBACKEND::pfnSetPCHSGeometry */
5226	static DECLCALLBACK(int) iscsiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
5227	{
5228	RT_NOREF1(pPCHSGeometry);
5229	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
5230	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5231
5232	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5233
5234	int rc;
5235	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
5236	rc = VERR_VD_IMAGE_READ_ONLY;
5237	else
5238	rc = VERR_VD_GEOMETRY_NOT_SET;
5239
5240	LogFlowFunc(("returns %Rrc\n", rc));
5241	return rc;
5242	}
5243
5244	/** @copydoc VDIMAGEBACKEND::pfnGetLCHSGeometry */
5245	static DECLCALLBACK(int) iscsiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
5246	{
5247	RT_NOREF1(pLCHSGeometry);
5248	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
5249	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5250
5251	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5252
5253	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", VERR_VD_GEOMETRY_NOT_SET,
5254	pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
5255	return VERR_VD_GEOMETRY_NOT_SET;
5256	}
5257
5258	/** @copydoc VDIMAGEBACKEND::pfnSetLCHSGeometry */
5259	static DECLCALLBACK(int) iscsiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
5260	{
5261	RT_NOREF1(pLCHSGeometry);
5262	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
5263	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5264
5265	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5266
5267	int rc;
5268	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
5269	rc = VERR_VD_IMAGE_READ_ONLY;
5270	else
5271	rc = VERR_VD_GEOMETRY_NOT_SET;
5272
5273	LogFlowFunc(("returns %Rrc\n", rc));
5274	return rc;
5275	}
5276
5277	/** @copydoc VDIMAGEBACKEND::pfnQueryRegions */
5278	static DECLCALLBACK(int) iscsiQueryRegions(void pBackendData, PCVDREGIONLIST ppRegionList)
5279	{
5280	LogFlowFunc(("pBackendData=%#p ppRegionList=%#p\n", pBackendData, ppRegionList));
5281	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5282
5283	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
5284
5285	*ppRegionList = &pImage->RegionList;
5286	LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
5287	return VINF_SUCCESS;
5288	}
5289
5290	/** @copydoc VDIMAGEBACKEND::pfnRegionListRelease */
5291	static DECLCALLBACK(void) iscsiRegionListRelease(void *pBackendData, PCVDREGIONLIST pRegionList)
5292	{
5293	RT_NOREF1(pRegionList);
5294	LogFlowFunc(("pBackendData=%#p pRegionList=%#p\n", pBackendData, pRegionList));
5295	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5296	AssertPtr(pImage); RT_NOREF(pImage);
5297
5298	/* Nothing to do here. */
5299	}
5300
5301	/** @copydoc VDIMAGEBACKEND::pfnGetImageFlags */
5302	static DECLCALLBACK(unsigned) iscsiGetImageFlags(void *pBackendData)
5303	{
5304	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
5305	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5306
5307	AssertPtrReturn(pImage, 0);
5308
5309	LogFlowFunc(("returns %#x\n", VD_IMAGE_FLAGS_FIXED));
5310	return VD_IMAGE_FLAGS_FIXED;
5311	}
5312
5313	/** @copydoc VDIMAGEBACKEND::pfnGetOpenFlags */
5314	static DECLCALLBACK(unsigned) iscsiGetOpenFlags(void *pBackendData)
5315	{
5316	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
5317	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5318
5319	AssertPtrReturn(pImage, 0);
5320
5321	LogFlowFunc(("returns %#x\n", pImage->uOpenFlags));
5322	return pImage->uOpenFlags;
5323	}
5324
5325	/** @copydoc VDIMAGEBACKEND::pfnSetOpenFlags */
5326	static DECLCALLBACK(int) iscsiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
5327	{
5328	LogFlowFunc(("pBackendData=%#p uOpenFlags=%#x\n", pBackendData, uOpenFlags));
5329	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5330	int rc = VINF_SUCCESS;
5331
5332	/* Image must be opened and the new flags must be valid. */
5333	AssertReturn(pImage && !(uOpenFlags & ~( VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO
5334	\| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE
5335	\| VD_OPEN_FLAGS_SEQUENTIAL \| VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS)),
5336	VERR_INVALID_PARAMETER);
5337
5338	/*
5339	* A read/write -> readonly transition is always possible,
5340	* for the reverse direction check that the target didn't present itself
5341	* as readonly during the first attach.
5342	*/
5343	if ( !(uOpenFlags & VD_OPEN_FLAGS_READONLY)
5344	&& (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
5345	&& pImage->fTargetReadOnly)
5346	rc = VERR_VD_IMAGE_READ_ONLY;
5347	else
5348	{
5349	pImage->uOpenFlags = uOpenFlags;
5350	pImage->fTryReconnect = true;
5351	}
5352
5353	LogFlowFunc(("returns %Rrc\n", rc));
5354	return rc;
5355	}
5356
5357	/** @copydoc VDIMAGEBACKEND::pfnGetComment */
5358	VD_BACKEND_CALLBACK_GET_COMMENT_DEF_NOT_SUPPORTED(iscsiGetComment);
5359
5360	/** @copydoc VDIMAGEBACKEND::pfnSetComment */
5361	VD_BACKEND_CALLBACK_SET_COMMENT_DEF_NOT_SUPPORTED(iscsiSetComment, PISCSIIMAGE);
5362
5363	/** @copydoc VDIMAGEBACKEND::pfnGetUuid */
5364	VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(iscsiGetUuid);
5365
5366	/** @copydoc VDIMAGEBACKEND::pfnSetUuid */
5367	VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(iscsiSetUuid, PISCSIIMAGE);
5368
5369	/** @copydoc VDIMAGEBACKEND::pfnGetModificationUuid */
5370	VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(iscsiGetModificationUuid);
5371
5372	/** @copydoc VDIMAGEBACKEND::pfnSetModificationUuid */
5373	VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(iscsiSetModificationUuid, PISCSIIMAGE);
5374
5375	/** @copydoc VDIMAGEBACKEND::pfnGetParentUuid */
5376	VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(iscsiGetParentUuid);
5377
5378	/** @copydoc VDIMAGEBACKEND::pfnSetParentUuid */
5379	VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(iscsiSetParentUuid, PISCSIIMAGE);
5380
5381	/** @copydoc VDIMAGEBACKEND::pfnGetParentModificationUuid */
5382	VD_BACKEND_CALLBACK_GET_UUID_DEF_NOT_SUPPORTED(iscsiGetParentModificationUuid);
5383
5384	/** @copydoc VDIMAGEBACKEND::pfnSetParentModificationUuid */
5385	VD_BACKEND_CALLBACK_SET_UUID_DEF_NOT_SUPPORTED(iscsiSetParentModificationUuid, PISCSIIMAGE);
5386
5387	/** @copydoc VDIMAGEBACKEND::pfnDump */
5388	static DECLCALLBACK(void) iscsiDump(void *pBackendData)
5389	{
5390	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5391
5392	AssertPtrReturnVoid(pImage);
5393	/** @todo put something useful here */
5394	vdIfErrorMessage(pImage->pIfError, "Header: cVolume=%u\n", pImage->cVolume);
5395	}
5396
5397	/** @copydoc VDIMAGEBACKEND::pfnComposeLocation */
5398	static DECLCALLBACK(int) iscsiComposeLocation(PVDINTERFACE pConfig, char **pszLocation)
5399	{
5400	char *pszTarget = NULL;
5401	char *pszLUN = NULL;
5402	char *pszAddress = NULL;
5403	int rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetName", &pszTarget);
5404	if (RT_SUCCESS(rc))
5405	{
5406	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "LUN", &pszLUN);
5407	if (RT_SUCCESS(rc))
5408	{
5409	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetAddress", &pszAddress);
5410	if (RT_SUCCESS(rc))
5411	{
5412	if (RTStrAPrintf(pszLocation, "iscsi://%s/%s/%s",
5413	pszAddress, pszTarget, pszLUN) < 0)
5414	rc = VERR_NO_MEMORY;
5415	}
5416	}
5417	}
5418	RTMemFree(pszTarget);
5419	RTMemFree(pszLUN);
5420	RTMemFree(pszAddress);
5421	return rc;
5422	}
5423
5424	/** @copydoc VDIMAGEBACKEND::pfnComposeName */
5425	static DECLCALLBACK(int) iscsiComposeName(PVDINTERFACE pConfig, char **pszName)
5426	{
5427	char *pszTarget = NULL;
5428	char *pszLUN = NULL;
5429	char *pszAddress = NULL;
5430	int rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetName", &pszTarget);
5431	if (RT_SUCCESS(rc))
5432	{
5433	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "LUN", &pszLUN);
5434	if (RT_SUCCESS(rc))
5435	{
5436	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetAddress", &pszAddress);
5437	if (RT_SUCCESS(rc))
5438	{
5439	/** @todo think about a nicer looking location scheme for iSCSI */
5440	if (RTStrAPrintf(pszName, "%s/%s/%s",
5441	pszAddress, pszTarget, pszLUN) < 0)
5442	rc = VERR_NO_MEMORY;
5443	}
5444	}
5445	}
5446	RTMemFree(pszTarget);
5447	RTMemFree(pszLUN);
5448	RTMemFree(pszAddress);
5449
5450	return rc;
5451	}
5452
5453
5454	const VDIMAGEBACKEND g_ISCSIBackend =
5455	{
5456	/* u32Version */
5457	VD_IMGBACKEND_VERSION,
5458	/* pszBackendName */
5459	"iSCSI",
5460	/* uBackendCaps */
5461	VD_CAP_CONFIG \| VD_CAP_TCPNET \| VD_CAP_ASYNC,
5462	/* papszFileExtensions */
5463	NULL,
5464	/* paConfigInfo */
5465	s_iscsiConfigInfo,
5466	/* prnProbe */
5467	iscsiProbe,
5468	/* pfnOpen */
5469	iscsiOpen,
5470	/* pfnCreate */
5471	iscsiCreate,
5472	/* pfnRename */
5473	NULL,
5474	/* pfnClose */
5475	iscsiClose,
5476	/* pfnRead */
5477	iscsiRead,
5478	/* pfnWrite */
5479	iscsiWrite,
5480	/* pfnFlush */
5481	iscsiFlush,
5482	/* pfnDiscard */
5483	NULL,
5484	/* pfnGetVersion */
5485	iscsiGetVersion,
5486	/* pfnGetFileSize */
5487	iscsiGetFileSize,
5488	/* pfnGetPCHSGeometry */
5489	iscsiGetPCHSGeometry,
5490	/* pfnSetPCHSGeometry */
5491	iscsiSetPCHSGeometry,
5492	/* pfnGetLCHSGeometry */
5493	iscsiGetLCHSGeometry,
5494	/* pfnSetLCHSGeometry */
5495	iscsiSetLCHSGeometry,
5496	/* pfnQueryRegions */
5497	iscsiQueryRegions,
5498	/* pfnRegionListRelease */
5499	iscsiRegionListRelease,
5500	/* pfnGetImageFlags */
5501	iscsiGetImageFlags,
5502	/* pfnGetOpenFlags */
5503	iscsiGetOpenFlags,
5504	/* pfnSetOpenFlags */
5505	iscsiSetOpenFlags,
5506	/* pfnGetComment */
5507	iscsiGetComment,
5508	/* pfnSetComment */
5509	iscsiSetComment,
5510	/* pfnGetUuid */
5511	iscsiGetUuid,
5512	/* pfnSetUuid */
5513	iscsiSetUuid,
5514	/* pfnGetModificationUuid */
5515	iscsiGetModificationUuid,
5516	/* pfnSetModificationUuid */
5517	iscsiSetModificationUuid,
5518	/* pfnGetParentUuid */
5519	iscsiGetParentUuid,
5520	/* pfnSetParentUuid */
5521	iscsiSetParentUuid,
5522	/* pfnGetParentModificationUuid */
5523	iscsiGetParentModificationUuid,
5524	/* pfnSetParentModificationUuid */
5525	iscsiSetParentModificationUuid,
5526	/* pfnDump */
5527	iscsiDump,
5528	/* pfnGetTimestamp */
5529	NULL,
5530	/* pfnGetParentTimestamp */
5531	NULL,
5532	/* pfnSetParentTimestamp */
5533	NULL,
5534	/* pfnGetParentFilename */
5535	NULL,
5536	/* pfnSetParentFilename */
5537	NULL,
5538	/* pfnComposeLocation */
5539	iscsiComposeLocation,
5540	/* pfnComposeName */
5541	iscsiComposeName,
5542	/* pfnCompact */
5543	NULL,
5544	/* pfnResize */
5545	NULL,
5546	/* pfnRepair */
5547	NULL,
5548	/* pfnTraverseMetadata */
5549	NULL,
5550	/* u32VersionEnd */
5551	VD_IMGBACKEND_VERSION
5552	};

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