ISCSI.cpp@ 38621

Last change on this file since 38621 was 38621, checked in by vboxsync, 13 years ago
VD: Initial support to discard unused blocks in an image + support for VDI images
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1	/* $Id: ISCSI.cpp 38621 2011-09-04 16:56:56Z vboxsync $ */
2	/** @file
3	* iSCSI initiator driver, VD backend.
4	*/
5
6	/*
7	* Copyright (C) 2006-2011 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_VD_ISCSI
23	#include <VBox/vd-plugin.h>
24	#include <VBox/err.h>
25
26	#include <VBox/log.h>
27	#include <iprt/alloc.h>
28	#include <iprt/assert.h>
29	#include <iprt/uuid.h>
30	#include <iprt/string.h>
31	#include <iprt/asm.h>
32	#include <iprt/thread.h>
33	#include <iprt/semaphore.h>
34	#include <iprt/md5.h>
35	#include <iprt/tcp.h>
36	#include <iprt/time.h>
37	#include <VBox/scsi.h>
38
39
40	/*******************************************************************************
41	* Defined Constants And Macros *
42	*******************************************************************************/
43
44	/** The maximum number of release log entries per image. */
45	#define MAX_LOG_REL_ERRORS 1024
46
47	/** Default port number to use for iSCSI. */
48	#define ISCSI_DEFAULT_PORT 3260
49
50
51	/** Converts a number in the range of 0 - 15 into the corresponding hex char. */
52	#define NUM_2_HEX(b) ('0' + (b) + (((b) > 9) ? 39 : 0))
53	/** Converts a hex char into the corresponding number in the range 0-15. */
54	#define HEX_2_NUM(c) (((c) <= '9') ? ((c) - '0') : (((c - 'A' + 10) & 0xf)))
55	/* Converts a base64 char into the corresponding number in the range 0-63. */
56	#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)
57
58
59	/** Minimum CHAP_MD5 challenge length in bytes. */
60	#define CHAP_MD5_CHALLENGE_MIN 16
61	/** Maximum CHAP_MD5 challenge length in bytes. */
62	#define CHAP_MD5_CHALLENGE_MAX 24
63
64
65	/**
66	* SCSI peripheral device type. */
67	typedef enum SCSIDEVTYPE
68	{
69	/** direct-access device. */
70	SCSI_DEVTYPE_DISK = 0,
71	/** sequential-access device. */
72	SCSI_DEVTYPE_TAPE,
73	/** printer device. */
74	SCSI_DEVTYPE_PRINTER,
75	/** processor device. */
76	SCSI_DEVTYPE_PROCESSOR,
77	/** write-once device. */
78	SCSI_DEVTYPE_WORM,
79	/** CD/DVD device. */
80	SCSI_DEVTYPE_CDROM,
81	/** scanner device. */
82	SCSI_DEVTYPE_SCANNER,
83	/** optical memory device. */
84	SCSI_DEVTYPE_OPTICAL,
85	/** medium changer. */
86	SCSI_DEVTYPE_CHANGER,
87	/** communications device. */
88	SCSI_DEVTYPE_COMMUNICATION,
89	/** storage array controller device. */
90	SCSI_DEVTYPE_RAIDCTL = 0x0c,
91	/** enclosure services device. */
92	SCSI_DEVTYPE_ENCLOSURE,
93	/** simplified direct-access device. */
94	SCSI_DEVTYPE_SIMPLEDISK,
95	/** optical card reader/writer device. */
96	SCSI_DEVTYPE_OCRW,
97	/** bridge controller device. */
98	SCSI_DEVTYPE_BRIDGE,
99	/** object-based storage device. */
100	SCSI_DEVTYPE_OSD
101	} SCSIDEVTYPE;
102
103	/** Mask for extracting the SCSI device type out of the first byte of the INQUIRY response. */
104	#define SCSI_DEVTYPE_MASK 0x1f
105
106	/** Mask to extract the CmdQue bit out of the seventh byte of the INQUIRY response. */
107	#define SCSI_INQUIRY_CMDQUE_MASK 0x02
108
109	/** Maximum PDU payload size we can handle in one piece. Greater or equal than
110	* s_iscsiConfigDefaultWriteSplit. */
111	#define ISCSI_DATA_LENGTH_MAX _256K
112
113	/** Maximum PDU size we can handle in one piece. */
114	#define ISCSI_RECV_PDU_BUFFER_SIZE (ISCSI_DATA_LENGTH_MAX + ISCSI_BHS_SIZE)
115
116
117	/** Version of the iSCSI standard which this initiator driver can handle. */
118	#define ISCSI_MY_VERSION 0
119
120
121	/** Length of ISCSI basic header segment. */
122	#define ISCSI_BHS_SIZE 48
123
124
125	/** Reserved task tag value. */
126	#define ISCSI_TASK_TAG_RSVD 0xffffffff
127
128
129	/**
130	* iSCSI opcodes. */
131	typedef enum ISCSIOPCODE
132	{
133	/** NOP-Out. */
134	ISCSIOP_NOP_OUT = 0x00000000,
135	/** SCSI command. */
136	ISCSIOP_SCSI_CMD = 0x01000000,
137	/** SCSI task management request. */
138	ISCSIOP_SCSI_TASKMGMT_REQ = 0x02000000,
139	/** Login request. */
140	ISCSIOP_LOGIN_REQ = 0x03000000,
141	/** Text request. */
142	ISCSIOP_TEXT_REQ = 0x04000000,
143	/** SCSI Data-Out. */
144	ISCSIOP_SCSI_DATA_OUT = 0x05000000,
145	/** Logout request. */
146	ISCSIOP_LOGOUT_REQ = 0x06000000,
147	/** SNACK request. */
148	ISCSIOP_SNACK_REQ = 0x10000000,
149
150	/** NOP-In. */
151	ISCSIOP_NOP_IN = 0x20000000,
152	/** SCSI response. */
153	ISCSIOP_SCSI_RES = 0x21000000,
154	/** SCSI Task Management response. */
155	ISCSIOP_SCSI_TASKMGMT_RES = 0x22000000,
156	/** Login response. */
157	ISCSIOP_LOGIN_RES = 0x23000000,
158	/** Text response. */
159	ISCSIOP_TEXT_RES = 0x24000000,
160	/** SCSI Data-In. */
161	ISCSIOP_SCSI_DATA_IN = 0x25000000,
162	/** Logout response. */
163	ISCSIOP_LOGOUT_RES = 0x26000000,
164	/** Ready To Transfer (R2T). */
165	ISCSIOP_R2T = 0x31000000,
166	/** Asynchronous message. */
167	ISCSIOP_ASYN_MSG = 0x32000000,
168	/** Reject. */
169	ISCSIOP_REJECT = 0x3f000000
170	} ISCSIOPCODE;
171
172	/** Mask for extracting the iSCSI opcode out of the first header word. */
173	#define ISCSIOP_MASK 0x3f000000
174
175
176	/** ISCSI BHS word 0: Request should be processed immediately. */
177	#define ISCSI_IMMEDIATE_DELIVERY_BIT 0x40000000
178
179	/** ISCSI BHS word 0: This is the final PDU for this request/response. */
180	#define ISCSI_FINAL_BIT 0x00800000
181	/** ISCSI BHS word 0: Mask for extracting the CSG. */
182	#define ISCSI_CSG_MASK 0x000c0000
183	/** ISCSI BHS word 0: Shift offset for extracting the CSG. */
184	#define ISCSI_CSG_SHIFT 18
185	/** ISCSI BHS word 0: Mask for extracting the NSG. */
186	#define ISCSI_NSG_MASK 0x00030000
187	/** ISCSI BHS word 0: Shift offset for extracting the NSG. */
188	#define ISCSI_NSG_SHIFT 16
189
190	/** ISCSI BHS word 0: task attribute untagged */
191	#define ISCSI_TASK_ATTR_UNTAGGED 0x00000000
192	/** ISCSI BHS word 0: task attribute simple */
193	#define ISCSI_TASK_ATTR_SIMPLE 0x00010000
194	/** ISCSI BHS word 0: task attribute ordered */
195	#define ISCSI_TASK_ATTR_ORDERED 0x00020000
196	/** ISCSI BHS word 0: task attribute head of queue */
197	#define ISCSI_TASK_ATTR_HOQ 0x00030000
198	/** ISCSI BHS word 0: task attribute ACA */
199	#define ISCSI_TASK_ATTR_ACA 0x00040000
200
201	/** ISCSI BHS word 0: transit to next login phase. */
202	#define ISCSI_TRANSIT_BIT 0x00800000
203	/** ISCSI BHS word 0: continue with login negotiation. */
204	#define ISCSI_CONTINUE_BIT 0x00400000
205
206	/** ISCSI BHS word 0: residual underflow. */
207	#define ISCSI_RESIDUAL_UNFL_BIT 0x00020000
208	/** ISCSI BHS word 0: residual overflow. */
209	#define ISCSI_RESIDUAL_OVFL_BIT 0x00040000
210	/** ISCSI BHS word 0: Bidirectional read residual underflow. */
211	#define ISCSI_BI_READ_RESIDUAL_UNFL_BIT 0x00080000
212	/** ISCSI BHS word 0: Bidirectional read residual overflow. */
213	#define ISCSI_BI_READ_RESIDUAL_OVFL_BIT 0x00100000
214
215	/** ISCSI BHS word 0: SCSI response mask. */
216	#define ISCSI_SCSI_RESPONSE_MASK 0x0000ff00
217	/** ISCSI BHS word 0: SCSI status mask. */
218	#define ISCSI_SCSI_STATUS_MASK 0x000000ff
219
220	/** ISCSI BHS word 0: response includes status. */
221	#define ISCSI_STATUS_BIT 0x00010000
222
223	/** Maximum number of scatter/gather segments needed to send a PDU. */
224	#define ISCSI_SG_SEGMENTS_MAX 4
225
226	/** Number of entries in the command table. */
227	#define ISCSI_CMD_WAITING_ENTRIES 32
228
229	/**
230	* iSCSI login status class. */
231	typedef enum ISCSILOGINSTATUSCLASS
232	{
233	/** Success. */
234	ISCSI_LOGIN_STATUS_CLASS_SUCCESS = 0,
235	/** Redirection. */
236	ISCSI_LOGIN_STATUS_CLASS_REDIRECTION,
237	/** Initiator error. */
238	ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR,
239	/** Target error. */
240	ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR
241	} ISCSILOGINSTATUSCLASS;
242
243
244	/**
245	* iSCSI connection state. */
246	typedef enum ISCSISTATE
247	{
248	/** Not having a connection/session at all. */
249	ISCSISTATE_FREE,
250	/** Currently trying to login. */
251	ISCSISTATE_IN_LOGIN,
252	/** Normal operation, corresponds roughly to the Full Feature Phase. */
253	ISCSISTATE_NORMAL,
254	/** Currently trying to logout. */
255	ISCSISTATE_IN_LOGOUT
256	} ISCSISTATE;
257
258	/**
259	* iSCSI PDU send flags (and maybe more in the future). */
260	typedef enum ISCSIPDUFLAGS
261	{
262	/** No special flags */
263	ISCSIPDU_DEFAULT = 0,
264	/** Do not attempt to re-attach to the target if the connection is lost */
265	ISCSIPDU_NO_REATTACH = RT_BIT(1)
266	} ISCSIPDUFLAGS;
267
268
269	/*******************************************************************************
270	* Structures and Typedefs *
271	*******************************************************************************/
272
273	/**
274	* iSCSI login negotiation parameter
275	*/
276	typedef struct ISCSIPARAMETER
277	{
278	/** Name of the parameter. */
279	const char *pszParamName;
280	/** Value of the parameter. */
281	const char *pszParamValue;
282	/** Length of the binary parameter. 0=zero-terminated string. */
283	size_t cbParamValue;
284	} ISCSIPARAMETER;
285
286
287	/**
288	* iSCSI Response PDU buffer (scatter).
289	*/
290	typedef struct ISCSIRES
291	{
292	/** Length of PDU segment. */
293	size_t cbSeg;
294	/** Pointer to PDU segment. */
295	void *pvSeg;
296	} ISCSIRES;
297	/** Pointer to an iSCSI Response PDU buffer. */
298	typedef ISCSIRES *PISCSIRES;
299	/** Pointer to a const iSCSI Response PDU buffer. */
300	typedef ISCSIRES const *PCISCSIRES;
301
302
303	/**
304	* iSCSI Request PDU buffer (gather).
305	*/
306	typedef struct ISCSIREQ
307	{
308	/** Length of PDU segment in bytes. */
309	size_t cbSeg;
310	/** Pointer to PDU segment. */
311	const void *pcvSeg;
312	} ISCSIREQ;
313	/** Pointer to an iSCSI Request PDU buffer. */
314	typedef ISCSIREQ *PISCSIREQ;
315	/** Pointer to a const iSCSI Request PDU buffer. */
316	typedef ISCSIREQ const *PCISCSIREQ;
317
318
319	/**
320	* SCSI transfer directions.
321	*/
322	typedef enum SCSIXFER
323	{
324	SCSIXFER_NONE = 0,
325	SCSIXFER_TO_TARGET,
326	SCSIXFER_FROM_TARGET,
327	SCSIXFER_TO_FROM_TARGET
328	} SCSIXFER, *PSCSIXFER;
329
330	/** Forward declaration. */
331	typedef struct ISCSIIMAGE *PISCSIIMAGE;
332
333	/**
334	* SCSI request structure.
335	*/
336	typedef struct SCSIREQ
337	{
338	/** Transfer direction. */
339	SCSIXFER enmXfer;
340	/** Length of command block. */
341	size_t cbCDB;
342	/** Length of Initiator2Target data buffer. */
343	size_t cbI2TData;
344	/** Length of Target2Initiator data buffer. */
345	size_t cbT2IData;
346	/** Length of sense buffer
347	* This contains the number of sense bytes received upon completion. */
348	size_t cbSense;
349	/** Completion status of the command. */
350	uint8_t status;
351	/** Pointer to command block. */
352	void *pvCDB;
353	/** Pointer to sense buffer. */
354	void *pvSense;
355	/** Pointer to the Initiator2Target S/G list. */
356	PRTSGSEG paI2TSegs;
357	/** Number of entries in the I2T S/G list. */
358	unsigned cI2TSegs;
359	/** Pointer to the Target2Initiator S/G list. */
360	PRTSGSEG paT2ISegs;
361	/** Number of entries in the T2I S/G list. */
362	unsigned cT2ISegs;
363	/** S/G buffer for the target to initiator bits. */
364	RTSGBUF SgBufT2I;
365	} SCSIREQ, *PSCSIREQ;
366
367	/**
368	* Async request structure holding all necessary data for
369	* request processing.
370	*/
371	typedef struct SCSIREQASYNC
372	{
373	/** I/O context associated with this request. */
374	PVDIOCTX pIoCtx;
375	/** Pointer to the SCSI request structure. */
376	PSCSIREQ pScsiReq;
377	/** The CDB. */
378	uint8_t abCDB[16];
379	/** The sense buffer. */
380	uint8_t abSense[96];
381	/** Status code to return if we got sense data. */
382	int rcSense;
383	/** Number of retries if the command completes with sense
384	* data before we return with an error.
385	*/
386	unsigned cSenseRetries;
387	/** The number of entries in the I2T S/G list. */
388	unsigned cI2TSegs;
389	/** The number of entries in the T2I S/G list. */
390	unsigned cT2ISegs;
391	/** The S/G list - variable in size.
392	* This array holds both the I2T and T2I segments.
393	* The I2T segments are first and the T2I are second.
394	*/
395	RTSGSEG aSegs[1];
396	} SCSIREQASYNC, *PSCSIREQASYNC;
397
398	typedef enum ISCSICMDTYPE
399	{
400	/** Process a SCSI request. */
401	ISCSICMDTYPE_REQ = 0,
402	/** Call a function in the I/O thread. */
403	ISCSICMDTYPE_EXEC,
404	/** Usual 32bit hack. */
405	ISCSICMDTYPE_32BIT_HACK = 0x7fffffff
406	} ISCSICMDTYPE;
407
408
409	/** The command completion function. */
410	typedef DECLCALLBACK(void) FNISCSICMDCOMPLETED(PISCSIIMAGE pImage, int rcReq, void *pvUser);
411	/** Pointer to a command completion function. */
412	typedef FNISCSICMDCOMPLETED *PFNISCSICMDCOMPLETED;
413
414	/** The command execution function. */
415	typedef DECLCALLBACK(int) FNISCSIEXEC(void *pvUser);
416	/** Pointer to a command execution function. */
417	typedef FNISCSIEXEC *PFNISCSIEXEC;
418
419	/**
420	* Structure used to complete a synchronous request.
421	*/
422	typedef struct ISCSICMDSYNC
423	{
424	/** Event semaphore to wakeup the waiting thread. */
425	RTSEMEVENT EventSem;
426	/** Status code of the command. */
427	int rcCmd;
428	} ISCSICMDSYNC, *PISCSICMDSYNC;
429
430	/**
431	* iSCSI command.
432	* Used to forward requests to the I/O thread
433	* if existing.
434	*/
435	typedef struct ISCSICMD
436	{
437	/** Next one in the list. */
438	struct ISCSICMD *pNext;
439	/** Assigned ITT. */
440	uint32_t Itt;
441	/** Completion callback. */
442	PFNISCSICMDCOMPLETED pfnComplete;
443	/** Opaque user data. */
444	void *pvUser;
445	/** Command to execute. */
446	ISCSICMDTYPE enmCmdType;
447	/** Command type dependent data. */
448	union
449	{
450	/** Process a SCSI request. */
451	struct
452	{
453	/** The SCSI request to process. */
454	PSCSIREQ pScsiReq;
455	} ScsiReq;
456	/** Call a function in the I/O thread. */
457	struct
458	{
459	/** The method to execute. */
460	PFNISCSIEXEC pfnExec;
461	/** User data. */
462	void *pvUser;
463	} Exec;
464	} CmdType;
465	} ISCSICMD, *PISCSICMD;
466
467	/**
468	* Send iSCSI PDU.
469	* Contains all necessary data to send a PDU.
470	*/
471	typedef struct ISCSIPDUTX
472	{
473	/** Pointer to the next PDu to send. */
474	struct ISCSIPDUTX *pNext;
475	/** The BHS. */
476	uint32_t aBHS[12];
477	/** Assigned CmdSN for this PDU. */
478	uint32_t CmdSN;
479	/** The S/G buffer used for sending. */
480	RTSGBUF SgBuf;
481	/** Number of bytes to send until the PDU completed. */
482	size_t cbSgLeft;
483	/** The iSCSI command this PDU belongs to. */
484	PISCSICMD pIScsiCmd;
485	/** Number of segments in the request segments array. */
486	unsigned cISCSIReq;
487	/** The request segments - variable in size. */
488	RTSGSEG aISCSIReq[1];
489	} ISCSIPDUTX, *PISCSIPDUTX;
490
491	/**
492	* Block driver instance data.
493	*/
494	typedef struct ISCSIIMAGE
495	{
496	/** Pointer to the filename (location). Not really used. */
497	const char *pszFilename;
498	/** Pointer to the initiator name. */
499	char *pszInitiatorName;
500	/** Pointer to the target name. */
501	char *pszTargetName;
502	/** Pointer to the target address. */
503	char *pszTargetAddress;
504	/** Pointer to the user name for authenticating the Initiator. */
505	char *pszInitiatorUsername;
506	/** Pointer to the secret for authenticating the Initiator. */
507	uint8_t *pbInitiatorSecret;
508	/** Length of the secret for authenticating the Initiator. */
509	size_t cbInitiatorSecret;
510	/** Pointer to the user name for authenticating the Target. */
511	char *pszTargetUsername;
512	/** Pointer to the secret for authenticating the Initiator. */
513	uint8_t *pbTargetSecret;
514	/** Length of the secret for authenticating the Initiator. */
515	size_t cbTargetSecret;
516	/** Limit for iSCSI writes, essentially limiting the amount of data
517	* written in a single write. This is negotiated with the target, so
518	* the actual size might be smaller. */
519	uint32_t cbWriteSplit;
520	/** Initiator session identifier. */
521	uint64_t ISID;
522	/** SCSI Logical Unit Number. */
523	uint64_t LUN;
524	/** Pointer to the per-disk VD interface list. */
525	PVDINTERFACE pVDIfsDisk;
526	/** Pointer to the per-image VD interface list. */
527	PVDINTERFACE pVDIfsImage;
528	/** Error interface. */
529	PVDINTERFACEERROR pIfError;
530	/** Config interface. */
531	PVDINTERFACECONFIG pIfConfig;
532	/** I/O interface. */
533	PVDINTERFACEIOINT pIfIo;
534	/** TCP network stack interface. */
535	PVDINTERFACETCPNET pIfNet;
536	/** Image open flags. */
537	unsigned uOpenFlags;
538	/** Number of re-login retries when a connection fails. */
539	uint32_t cISCSIRetries;
540	/** Sector size on volume. */
541	uint32_t cbSector;
542	/** Size of volume in sectors. */
543	uint64_t cVolume;
544	/** Total volume size in bytes. Easier than multiplying the above values all the time. */
545	uint64_t cbSize;
546
547	/** Negotiated maximum data length when sending to target. */
548	uint32_t cbSendDataLength;
549	/** Negotiated maximum data length when receiving from target. */
550	uint32_t cbRecvDataLength;
551
552	/** Current state of the connection/session. */
553	ISCSISTATE state;
554	/** Flag whether the first Login Response PDU has been seen. */
555	bool FirstRecvPDU;
556	/** Initiator Task Tag of the last iSCSI request PDU. */
557	uint32_t ITT;
558	/** Sequence number of the last command. */
559	uint32_t CmdSN;
560	/** Sequence number of the next command expected by the target. */
561	uint32_t ExpCmdSN;
562	/** Maximum sequence number accepted by the target (determines size of window). */
563	uint32_t MaxCmdSN;
564	/** Expected sequence number of next status. */
565	uint32_t ExpStatSN;
566	/** Currently active request. */
567	PISCSIREQ paCurrReq;
568	/** Segment number of currently active request. */
569	uint32_t cnCurrReq;
570	/** Pointer to receive PDU buffer. (Freed by RT) */
571	void *pvRecvPDUBuf;
572	/** Length of receive PDU buffer. */
573	size_t cbRecvPDUBuf;
574	/** Mutex protecting against concurrent use from several threads. */
575	RTSEMMUTEX Mutex;
576
577	/** Pointer to the target hostname. */
578	char *pszHostname;
579	/** Port to use on the target host. */
580	uint32_t uPort;
581	/** Socket handle of the TCP connection. */
582	VDSOCKET Socket;
583	/** Timeout for read operations on the TCP connection (in milliseconds). */
584	uint32_t uReadTimeout;
585	/** Flag whether to automatically generate the initiator name. */
586	bool fAutomaticInitiatorName;
587	/** Flag whether to use the host IP stack or DevINIP. */
588	bool fHostIP;
589
590	/** Head of request queue */
591	PISCSICMD pScsiReqQueue;
592	/** Mutex protecting the request queue from concurrent access. */
593	RTSEMMUTEX MutexReqQueue;
594	/** I/O thread. */
595	RTTHREAD hThreadIo;
596	/** Flag whether the thread should be still running. */
597	volatile bool fRunning;
598	/* Flag whether the target supports command queuing. */
599	bool fCmdQueuingSupported;
600	/** Flag whether extended select is supported. */
601	bool fExtendedSelectSupported;
602	/** Padding used for aligning the PDUs. */
603	uint8_t aPadding[4];
604	/** Socket events to poll for. */
605	uint32_t fPollEvents;
606	/** Number of bytes to read to complete the current PDU. */
607	size_t cbRecvPDUResidual;
608	/** Current position in the PDU buffer. */
609	uint8_t *pbRecvPDUBufCur;
610	/** Flag whether we are currently reading the BHS. */
611	bool fRecvPDUBHS;
612	/** List of PDUs waiting to get transmitted. */
613	PISCSIPDUTX pIScsiPDUTxHead;
614	/** Tail of PDUs waiting to get transmitted. */
615	PISCSIPDUTX pIScsiPDUTxTail;
616	/** PDU we are currently transmitting. */
617	PISCSIPDUTX pIScsiPDUTxCur;
618	/** Number of commands waiting for an answer from the target.
619	* Used for timeout handling for poll.
620	*/
621	unsigned cCmdsWaiting;
622	/** Table of commands waiting for a response from the target. */
623	PISCSICMD aCmdsWaiting[ISCSI_CMD_WAITING_ENTRIES];
624
625	/** Release log counter. */
626	unsigned cLogRelErrors;
627	} ISCSIIMAGE;
628
629
630	/*******************************************************************************
631	* Static Variables *
632	*******************************************************************************/
633
634	/** Default initiator basename. */
635	static const char *s_iscsiDefaultInitiatorBasename = "iqn.2009-08.com.sun.virtualbox.initiator";
636
637	/** Default LUN. */
638	static const char *s_iscsiConfigDefaultLUN = "0";
639
640	/** Default timeout, 10 seconds. */
641	static const char *s_iscsiConfigDefaultTimeout = "10000";
642
643	/** Default write split value, less or equal to ISCSI_DATA_LENGTH_MAX. */
644	static const char *s_iscsiConfigDefaultWriteSplit = "262144";
645
646	/** Default host IP stack. */
647	static const char *s_iscsiConfigDefaultHostIPStack = "1";
648
649	/** Description of all accepted config parameters. */
650	static const VDCONFIGINFO s_iscsiConfigInfo[] =
651	{
652	{ "TargetName", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
653	/* LUN is defined of string type to handle the "enc" prefix. */
654	{ "LUN", s_iscsiConfigDefaultLUN, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
655	{ "TargetAddress", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
656	{ "InitiatorName", NULL, VDCFGVALUETYPE_STRING, 0 },
657	{ "InitiatorUsername", NULL, VDCFGVALUETYPE_STRING, 0 },
658	{ "InitiatorSecret", NULL, VDCFGVALUETYPE_BYTES, 0 },
659	{ "TargetUsername", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_EXPERT },
660	{ "TargetSecret", NULL, VDCFGVALUETYPE_BYTES, VD_CFGKEY_EXPERT },
661	{ "WriteSplit", s_iscsiConfigDefaultWriteSplit, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
662	{ "Timeout", s_iscsiConfigDefaultTimeout, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
663	{ "HostIPStack", s_iscsiConfigDefaultHostIPStack, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
664	{ NULL, NULL, VDCFGVALUETYPE_INTEGER, 0 }
665	};
666
667	/*******************************************************************************
668	* Internal Functions *
669	*******************************************************************************/
670
671	/* iSCSI low-level functions (only to be used from the iSCSI high-level functions). */
672	static uint32_t iscsiNewITT(PISCSIIMAGE pImage);
673	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq, uint32_t uFlags);
674	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes);
675	static int iscsiRecvPDUAsync(PISCSIIMAGE pImage);
676	static int iscsiSendPDUAsync(PISCSIIMAGE pImage);
677	static int iscsiValidatePDU(PISCSIRES paRes, uint32_t cnRes);
678	static int iscsiRecvPDUProcess(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes);
679	static int iscsiPDUTxPrepare(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd);
680	static int iscsiRecvPDUUpdateRequest(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes);
681	static void iscsiCmdComplete(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd, int rcCmd);
682	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char pcszKey, const char pcszValue, size_t cbValue);
683	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue);
684	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue);
685	static int iscsiUpdateParameters(PISCSIIMAGE pImage, const uint8_t *pbBuf, size_t cbBuf);
686
687	/* Serial number arithmetic comparison. */
688	static bool serial_number_less(uint32_t sn1, uint32_t sn2);
689	static bool serial_number_greater(uint32_t sn1, uint32_t sn2);
690
691	/* CHAP-MD5 functions. */
692	#ifdef IMPLEMENT_TARGET_AUTH
693	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge);
694	#endif
695	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
696	const uint8_t *pbSecret, size_t cbSecret);
697
698	/**
699	* Internal: release log wrapper limiting the number of entries.
700	*/
701	DECLINLINE(void) iscsiLogRel(PISCSIIMAGE pImage, const char *pcszFormat, ...)
702	{
703	if (pImage->cLogRelErrors++ < MAX_LOG_REL_ERRORS)
704	{
705	va_list va;
706
707	va_start(va, pcszFormat);
708	LogRel(("%N\n", pcszFormat, &va));
709	va_end(va);
710	}
711	}
712
713	DECLINLINE(bool) iscsiIsClientConnected(PISCSIIMAGE pImage)
714	{
715	return pImage->Socket != NIL_VDSOCKET
716	&& pImage->pIfNet->pfnIsClientConnected(pImage->Socket);
717	}
718
719	/**
720	* Calculates the hash for the given ITT used
721	* to look up the command in the table.
722	*/
723	DECLINLINE(uint32_t) iscsiIttHash(uint32_t Itt)
724	{
725	return Itt % ISCSI_CMD_WAITING_ENTRIES;
726	}
727
728	static PISCSICMD iscsiCmdGetFromItt(PISCSIIMAGE pImage, uint32_t Itt)
729	{
730	PISCSICMD pIScsiCmd = NULL;
731
732	pIScsiCmd = pImage->aCmdsWaiting[iscsiIttHash(Itt)];
733
734	while ( pIScsiCmd
735	&& pIScsiCmd->Itt != Itt)
736	pIScsiCmd = pIScsiCmd->pNext;
737
738	return pIScsiCmd;
739	}
740
741	static void iscsiCmdInsert(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
742	{
743	PISCSICMD pIScsiCmdOld;
744	uint32_t idx = iscsiIttHash(pIScsiCmd->Itt);
745
746	Assert(!pIScsiCmd->pNext);
747
748	pIScsiCmdOld = pImage->aCmdsWaiting[idx];
749	pIScsiCmd->pNext = pIScsiCmdOld;
750	pImage->aCmdsWaiting[idx] = pIScsiCmd;
751	pImage->cCmdsWaiting++;
752	}
753
754	static PISCSICMD iscsiCmdRemove(PISCSIIMAGE pImage, uint32_t Itt)
755	{
756	PISCSICMD pIScsiCmd = NULL;
757	PISCSICMD pIScsiCmdPrev = NULL;
758	uint32_t idx = iscsiIttHash(Itt);
759
760	pIScsiCmd = pImage->aCmdsWaiting[idx];
761
762	while ( pIScsiCmd
763	&& pIScsiCmd->Itt != Itt)
764	{
765	pIScsiCmdPrev = pIScsiCmd;
766	pIScsiCmd = pIScsiCmd->pNext;
767	}
768
769	if (pIScsiCmd)
770	{
771	if (pIScsiCmdPrev)
772	{
773	Assert(!pIScsiCmd->pNext \|\| VALID_PTR(pIScsiCmd->pNext));
774	pIScsiCmdPrev->pNext = pIScsiCmd->pNext;
775	}
776	else
777	{
778	pImage->aCmdsWaiting[idx] = pIScsiCmd->pNext;
779	Assert(!pImage->aCmdsWaiting[idx] \|\| VALID_PTR(pImage->aCmdsWaiting[idx]));
780	}
781	pImage->cCmdsWaiting--;
782	}
783
784	return pIScsiCmd;
785	}
786
787	/**
788	* Removes all commands from the table and returns the
789	* list head
790	*
791	* @returns Pointer to the head of teh command list.
792	* @param pImage iSCSI connection to use.
793	*/
794	static PISCSICMD iscsiCmdRemoveAll(PISCSIIMAGE pImage)
795	{
796	PISCSICMD pIScsiCmdHead = NULL;
797
798	for (unsigned idx = 0; idx < RT_ELEMENTS(pImage->aCmdsWaiting); idx++)
799	{
800	PISCSICMD pHead;
801	PISCSICMD pTail;
802
803	pHead = pImage->aCmdsWaiting[idx];
804	pImage->aCmdsWaiting[idx] = NULL;
805
806	if (pHead)
807	{
808	/* Get the tail. */
809	pTail = pHead;
810	while (pTail->pNext)
811	pTail = pTail->pNext;
812
813	/* Concatenate. */
814	pTail->pNext = pIScsiCmdHead;
815	pIScsiCmdHead = pHead;
816	}
817	}
818	pImage->cCmdsWaiting = 0;
819
820	return pIScsiCmdHead;
821	}
822
823	static int iscsiTransportConnect(PISCSIIMAGE pImage)
824	{
825	int rc;
826	if (!pImage->pszHostname)
827	return VERR_NET_DEST_ADDRESS_REQUIRED;
828
829	rc = pImage->pIfNet->pfnClientConnect(pImage->Socket, pImage->pszHostname, pImage->uPort);
830	if (RT_FAILURE(rc))
831	{
832	if ( rc == VERR_NET_CONNECTION_REFUSED
833	\|\| rc == VERR_NET_CONNECTION_RESET
834	\|\| rc == VERR_NET_UNREACHABLE
835	\|\| rc == VERR_NET_HOST_UNREACHABLE
836	\|\| rc == VERR_NET_CONNECTION_TIMED_OUT)
837	{
838	/* Standardize return value for no connection. */
839	rc = VERR_NET_CONNECTION_REFUSED;
840	}
841	return rc;
842	}
843
844	/* Disable Nagle algorithm, we want things to be sent immediately. */
845	pImage->pIfNet->pfnSetSendCoalescing(pImage->Socket, false);
846
847	/* Make initiator name and ISID unique on this host. */
848	RTNETADDR LocalAddr;
849	rc = pImage->pIfNet->pfnGetLocalAddress(pImage->Socket, &LocalAddr);
850	if (RT_FAILURE(rc))
851	return rc;
852	if ( LocalAddr.uPort == RTNETADDR_PORT_NA
853	\|\| LocalAddr.uPort > 65535)
854	return VERR_NET_ADDRESS_FAMILY_NOT_SUPPORTED;
855	pImage->ISID &= ~65535ULL;
856	pImage->ISID \|= LocalAddr.uPort;
857	/* Eliminate the port so that it isn't included below. */
858	LocalAddr.uPort = RTNETADDR_PORT_NA;
859	if (pImage->fAutomaticInitiatorName)
860	{
861	if (pImage->pszInitiatorName)
862	RTStrFree(pImage->pszInitiatorName);
863	RTStrAPrintf(&pImage->pszInitiatorName, "%s:01:%RTnaddr",
864	s_iscsiDefaultInitiatorBasename, &LocalAddr);
865	if (!pImage->pszInitiatorName)
866	return VERR_NO_MEMORY;
867	}
868	LogRel(("iSCSI: connect from initiator %s with source port %u\n", pImage->pszInitiatorName, pImage->ISID & 65535));
869	return VINF_SUCCESS;
870	}
871
872
873	static int iscsiTransportClose(PISCSIIMAGE pImage)
874	{
875	int rc;
876
877	LogFlowFunc(("(%s:%d)\n", pImage->pszHostname, pImage->uPort));
878	if (iscsiIsClientConnected(pImage))
879	{
880	LogRel(("iSCSI: disconnect from initiator %s with source port %u\n", pImage->pszInitiatorName, pImage->ISID & 65535));
881	rc = pImage->pIfNet->pfnClientClose(pImage->Socket);
882	}
883	else
884	rc = VINF_SUCCESS;
885	LogFlowFunc(("returns %Rrc\n", rc));
886	return rc;
887	}
888
889
890	static int iscsiTransportRead(PISCSIIMAGE pImage, PISCSIRES paResponse, unsigned int cnResponse)
891	{
892	int rc = VINF_SUCCESS;
893	unsigned int i = 0;
894	size_t cbToRead, cbActuallyRead, residual, cbSegActual = 0, cbAHSLength, cbDataLength;
895	char *pDst;
896
897	LogFlowFunc(("cnResponse=%d (%s:%d)\n", cnResponse, pImage->pszHostname, pImage->uPort));
898	if (!iscsiIsClientConnected(pImage))
899	{
900	/* Reconnecting makes no sense in this case, as there will be nothing
901	* to receive. We would just run into a timeout. */
902	rc = VERR_BROKEN_PIPE;
903	}
904
905	if (RT_SUCCESS(rc) && paResponse[0].cbSeg >= ISCSI_BHS_SIZE)
906	{
907	cbToRead = 0;
908	residual = ISCSI_BHS_SIZE; /* Do not read more than the BHS length before the true PDU length is known. */
909	cbSegActual = residual;
910	pDst = (char *)paResponse[i].pvSeg;
911	uint64_t u64Timeout = RTTimeMilliTS() + pImage->uReadTimeout;
912	do
913	{
914	int64_t cMilliesRemaining = u64Timeout - RTTimeMilliTS();
915	if (cMilliesRemaining <= 0)
916	{
917	rc = VERR_TIMEOUT;
918	break;
919	}
920	Assert(cMilliesRemaining < 1000000);
921	rc = pImage->pIfNet->pfnSelectOne(pImage->Socket,
922	cMilliesRemaining);
923	if (RT_FAILURE(rc))
924	break;
925	rc = pImage->pIfNet->pfnRead(pImage->Socket,
926	pDst, residual,
927	&cbActuallyRead);
928	if (RT_FAILURE(rc))
929	break;
930	if (cbActuallyRead == 0)
931	{
932	/* The other end has closed the connection. */
933	iscsiTransportClose(pImage);
934	pImage->state = ISCSISTATE_FREE;
935	rc = VERR_NET_CONNECTION_RESET;
936	break;
937	}
938	if (cbToRead == 0)
939	{
940	/* Currently reading the BHS. */
941	residual -= cbActuallyRead;
942	pDst += cbActuallyRead;
943	if (residual <= 40)
944	{
945	/* Enough data read to figure out the actual PDU size. */
946	uint32_t word1 = RT_N2H_U32(((uint32_t *)(paResponse[0].pvSeg))[1]);
947	cbAHSLength = (word1 & 0xff000000) >> 24;
948	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
949	cbDataLength = word1 & 0x00ffffff;
950	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
951	cbToRead = residual + cbAHSLength + cbDataLength;
952	residual += paResponse[0].cbSeg - ISCSI_BHS_SIZE;
953	if (residual > cbToRead)
954	residual = cbToRead;
955	cbSegActual = ISCSI_BHS_SIZE + cbAHSLength + cbDataLength;
956	/* Check whether we are already done with this PDU (no payload). */
957	if (cbToRead == 0)
958	break;
959	}
960	}
961	else
962	{
963	cbToRead -= cbActuallyRead;
964	if (cbToRead == 0)
965	break;
966	pDst += cbActuallyRead;
967	residual -= cbActuallyRead;
968	}
969	if (residual == 0)
970	{
971	i++;
972	if (i >= cnResponse)
973	{
974	/* No space left in receive buffers. */
975	rc = VERR_BUFFER_OVERFLOW;
976	break;
977	}
978	pDst = (char *)paResponse[i].pvSeg;
979	residual = paResponse[i].cbSeg;
980	if (residual > cbToRead)
981	residual = cbToRead;
982	cbSegActual = residual;
983	}
984	LogFlowFunc(("cbToRead=%u residual=%u cbSegActual=%u cbActuallRead=%u\n",
985	cbToRead, residual, cbSegActual, cbActuallyRead));
986	} while (true);
987	}
988	else
989	{
990	if (RT_SUCCESS(rc))
991	rc = VERR_BUFFER_OVERFLOW;
992	}
993	if (RT_SUCCESS(rc))
994	{
995	paResponse[i].cbSeg = cbSegActual;
996	for (i++; i < cnResponse; i++)
997	paResponse[i].cbSeg = 0;
998	}
999
1000	if (RT_UNLIKELY( RT_FAILURE(rc)
1001	&& ( rc == VERR_NET_CONNECTION_RESET
1002	\|\| rc == VERR_NET_CONNECTION_ABORTED
1003	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
1004	\|\| rc == VERR_NET_CONNECTION_REFUSED
1005	\|\| rc == VERR_BROKEN_PIPE)))
1006	{
1007	/* Standardize return value for broken connection. */
1008	rc = VERR_BROKEN_PIPE;
1009	}
1010
1011	LogFlowFunc(("returns %Rrc\n", rc));
1012	return rc;
1013	}
1014
1015
1016	static int iscsiTransportWrite(PISCSIIMAGE pImage, PISCSIREQ paRequest, unsigned int cnRequest)
1017	{
1018	int rc = VINF_SUCCESS;
1019	uint32_t pad = 0;
1020	unsigned int i;
1021
1022	LogFlowFunc(("cnRequest=%d (%s:%d)\n", cnRequest, pImage->pszHostname, pImage->uPort));
1023	if (!iscsiIsClientConnected(pImage))
1024	{
1025	/* Attempt to reconnect if the connection was previously broken. */
1026	rc = iscsiTransportConnect(pImage);
1027	}
1028
1029	if (RT_SUCCESS(rc))
1030	{
1031	/* Construct scatter/gather buffer for entire request, worst case
1032	* needs twice as many entries to allow for padding. */
1033	unsigned cBuf = 0;
1034	for (i = 0; i < cnRequest; i++)
1035	{
1036	cBuf++;
1037	if (paRequest[i].cbSeg & 3)
1038	cBuf++;
1039	}
1040	Assert(cBuf < ISCSI_SG_SEGMENTS_MAX);
1041	RTSGBUF buf;
1042	RTSGSEG aSeg[ISCSI_SG_SEGMENTS_MAX];
1043	static char aPad[4] = { 0, 0, 0, 0 };
1044	RTSgBufInit(&buf, &aSeg[0], cBuf);
1045	unsigned iBuf = 0;
1046	for (i = 0; i < cnRequest; i++)
1047	{
1048	/* Actual data chunk. */
1049	aSeg[iBuf].pvSeg = (void *)paRequest[i].pcvSeg;
1050	aSeg[iBuf].cbSeg = paRequest[i].cbSeg;
1051	iBuf++;
1052	/* Insert proper padding before the next chunk. */
1053	if (paRequest[i].cbSeg & 3)
1054	{
1055	aSeg[iBuf].pvSeg = &aPad[0];
1056	aSeg[iBuf].cbSeg = 4 - (paRequest[i].cbSeg & 3);
1057	iBuf++;
1058	}
1059	}
1060	/* Send out the request, the socket is set to send data immediately,
1061	* avoiding unnecessary delays. */
1062	rc = pImage->pIfNet->pfnSgWrite(pImage->Socket, &buf);
1063
1064	}
1065
1066	if (RT_UNLIKELY( RT_FAILURE(rc)
1067	&& ( rc == VERR_NET_CONNECTION_RESET
1068	\|\| rc == VERR_NET_CONNECTION_ABORTED
1069	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
1070	\|\| rc == VERR_NET_CONNECTION_REFUSED
1071	\|\| rc == VERR_BROKEN_PIPE)))
1072	{
1073	/* Standardize return value for broken connection. */
1074	rc = VERR_BROKEN_PIPE;
1075	}
1076
1077	LogFlowFunc(("returns %Rrc\n", rc));
1078	return rc;
1079	}
1080
1081
1082	static int iscsiTransportOpen(PISCSIIMAGE pImage)
1083	{
1084	int rc = VINF_SUCCESS;
1085	size_t cbHostname = 0; /* shut up gcc */
1086	const char pcszPort = NULL; / shut up gcc */
1087	char *pszPortEnd;
1088	uint16_t uPort;
1089
1090	/* Clean up previous connection data. */
1091	iscsiTransportClose(pImage);
1092	if (pImage->pszHostname)
1093	{
1094	RTMemFree(pImage->pszHostname);
1095	pImage->pszHostname = NULL;
1096	pImage->uPort = 0;
1097	}
1098
1099	/* Locate the port number via the colon separating the hostname from the port. */
1100	if (*pImage->pszTargetAddress)
1101	{
1102	if (*pImage->pszTargetAddress != '[')
1103	{
1104	/* Normal hostname or IPv4 dotted decimal. */
1105	pcszPort = strchr(pImage->pszTargetAddress, ':');
1106	if (pcszPort != NULL)
1107	{
1108	cbHostname = pcszPort - pImage->pszTargetAddress;
1109	pcszPort++;
1110	}
1111	else
1112	cbHostname = strlen(pImage->pszTargetAddress);
1113	}
1114	else
1115	{
1116	/* IPv6 literal address. Contains colons, so skip to closing square bracket. */
1117	pcszPort = strchr(pImage->pszTargetAddress, ']');
1118	if (pcszPort != NULL)
1119	{
1120	pcszPort++;
1121	cbHostname = pcszPort - pImage->pszTargetAddress;
1122	if (*pcszPort == '\0')
1123	pcszPort = NULL;
1124	else if (*pcszPort != ':')
1125	rc = VERR_PARSE_ERROR;
1126	else
1127	pcszPort++;
1128	}
1129	else
1130	rc = VERR_PARSE_ERROR;
1131	}
1132	}
1133	else
1134	rc = VERR_PARSE_ERROR;
1135
1136	/* Now split address into hostname and port. */
1137	if (RT_SUCCESS(rc))
1138	{
1139	pImage->pszHostname = (char *)RTMemAlloc(cbHostname + 1);
1140	if (!pImage->pszHostname)
1141	rc = VERR_NO_MEMORY;
1142	else
1143	{
1144	memcpy(pImage->pszHostname, pImage->pszTargetAddress, cbHostname);
1145	pImage->pszHostname[cbHostname] = '\0';
1146	if (pcszPort != NULL)
1147	{
1148	rc = RTStrToUInt16Ex(pcszPort, &pszPortEnd, 0, &uPort);
1149	/* Note that RT_SUCCESS() macro to check the rc value is not strict enough in this case. */
1150	if (rc == VINF_SUCCESS && *pszPortEnd == '\0' && uPort != 0)
1151	{
1152	pImage->uPort = uPort;
1153	}
1154	else
1155	{
1156	rc = VERR_PARSE_ERROR;
1157	}
1158	}
1159	else
1160	pImage->uPort = ISCSI_DEFAULT_PORT;
1161	}
1162	}
1163
1164	if (RT_SUCCESS(rc))
1165	{
1166	if (!iscsiIsClientConnected(pImage))
1167	rc = iscsiTransportConnect(pImage);
1168	}
1169	else
1170	{
1171	if (pImage->pszHostname)
1172	{
1173	RTMemFree(pImage->pszHostname);
1174	pImage->pszHostname = NULL;
1175	}
1176	pImage->uPort = 0;
1177	}
1178
1179	LogFlowFunc(("returns %Rrc\n", rc));
1180	return rc;
1181	}
1182
1183
1184	/**
1185	* Attach to an iSCSI target. Performs all operations necessary to enter
1186	* Full Feature Phase.
1187	*
1188	* @returns VBox status.
1189	* @param pImage The iSCSI connection state to be used.
1190	*/
1191	static int iscsiAttach(void *pvUser)
1192	{
1193	int rc;
1194	uint32_t itt;
1195	uint32_t csg, nsg, substate;
1196	uint64_t isid_tsih;
1197	uint8_t bBuf[4096]; /* Should be large enough even for large authentication values. */
1198	size_t cbBuf;
1199	bool transit;
1200	uint8_t pbChallenge[1024]; /* RFC3720 specifies this as maximum. */
1201	size_t cbChallenge = 0; /* shut up gcc */
1202	uint8_t bChapIdx;
1203	uint8_t aResponse[RTMD5HASHSIZE];
1204	uint32_t cnISCSIReq;
1205	ISCSIREQ aISCSIReq[4];
1206	uint32_t aReqBHS[12];
1207	uint32_t cnISCSIRes;
1208	ISCSIRES aISCSIRes[2];
1209	uint32_t aResBHS[12];
1210	char *pszNext;
1211	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
1212
1213	bool fParameterNeg = true;;
1214	pImage->cbRecvDataLength = ISCSI_DATA_LENGTH_MAX;
1215	pImage->cbSendDataLength = RT_MIN(ISCSI_DATA_LENGTH_MAX, pImage->cbWriteSplit);
1216	char szMaxDataLength[16];
1217	RTStrPrintf(szMaxDataLength, sizeof(szMaxDataLength), "%u", ISCSI_DATA_LENGTH_MAX);
1218	ISCSIPARAMETER aParameterNeg[] =
1219	{
1220	{ "HeaderDigest", "None", 0 },
1221	{ "DataDigest", "None", 0 },
1222	{ "MaxConnections", "1", 0 },
1223	{ "InitialR2T", "No", 0 },
1224	{ "ImmediateData", "Yes", 0 },
1225	{ "MaxRecvDataSegmentLength", szMaxDataLength, 0 },
1226	{ "MaxBurstLength", szMaxDataLength, 0 },
1227	{ "FirstBurstLength", szMaxDataLength, 0 },
1228	{ "DefaultTime2Wait", "0", 0 },
1229	{ "DefaultTime2Retain", "60", 0 },
1230	{ "DataPDUInOrder", "Yes", 0 },
1231	{ "DataSequenceInOrder", "Yes", 0 },
1232	{ "ErrorRecoveryLevel", "0", 0 },
1233	{ "MaxOutstandingR2T", "1", 0 }
1234	};
1235
1236	LogFlowFunc(("entering\n"));
1237
1238	Assert(pImage->state == ISCSISTATE_FREE);
1239
1240	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1241
1242	/* Make 100% sure the connection isn't reused for a new login. */
1243	iscsiTransportClose(pImage);
1244
1245	restart:
1246	if (!iscsiIsClientConnected(pImage))
1247	{
1248	rc = iscsiTransportOpen(pImage);
1249	if (RT_FAILURE(rc))
1250	goto out;
1251	}
1252
1253	pImage->state = ISCSISTATE_IN_LOGIN;
1254	pImage->ITT = 1;
1255	pImage->FirstRecvPDU = true;
1256	pImage->CmdSN = 1;
1257	pImage->ExpCmdSN = 0;
1258	pImage->MaxCmdSN = 1;
1259	pImage->ExpStatSN = 0;
1260
1261	/*
1262	* Send login request to target.
1263	*/
1264	itt = iscsiNewITT(pImage);
1265	csg = 0;
1266	nsg = 0;
1267	substate = 0;
1268	isid_tsih = pImage->ISID << 16; /* TSIH field currently always 0 */
1269
1270	do {
1271	transit = false;
1272	cbBuf = 0;
1273	/* Handle all cases with a single switch statement. */
1274	switch (csg << 8 \| substate)
1275	{
1276	case 0x0000: /* security negotiation, step 0: propose authentication. */
1277	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "SessionType", "Normal", 0);
1278	if (RT_FAILURE(rc))
1279	goto out;
1280	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "InitiatorName", pImage->pszInitiatorName, 0);
1281	if (RT_FAILURE(rc))
1282	goto out;
1283	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "TargetName", pImage->pszTargetName, 0);
1284	if (RT_FAILURE(rc))
1285	goto out;
1286	if (pImage->pszInitiatorUsername == NULL)
1287	{
1288	/* No authentication. Immediately switch to next phase. */
1289	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "None", 0);
1290	if (RT_FAILURE(rc))
1291	goto out;
1292	nsg = 1;
1293	transit = true;
1294	}
1295	else
1296	{
1297	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "CHAP,None", 0);
1298	if (RT_FAILURE(rc))
1299	goto out;
1300	}
1301	break;
1302	case 0x0001: /* security negotiation, step 1: propose CHAP_MD5 variant. */
1303	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_A", "5", 0);
1304	if (RT_FAILURE(rc))
1305	goto out;
1306	break;
1307	case 0x0002: /* security negotiation, step 2: send authentication info. */
1308	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_N", pImage->pszInitiatorUsername, 0);
1309	if (RT_FAILURE(rc))
1310	goto out;
1311	chap_md5_compute_response(aResponse, bChapIdx, pbChallenge, cbChallenge,
1312	pImage->pbInitiatorSecret, pImage->cbInitiatorSecret);
1313	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_R", (const char *)aResponse, RTMD5HASHSIZE);
1314	if (RT_FAILURE(rc))
1315	goto out;
1316	nsg = 1;
1317	transit = true;
1318	break;
1319	case 0x0100: /* login operational negotiation, step 0: set parameters. */
1320	if (fParameterNeg)
1321	{
1322	for (unsigned i = 0; i < RT_ELEMENTS(aParameterNeg); i++)
1323	{
1324	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf,
1325	aParameterNeg[i].pszParamName,
1326	aParameterNeg[i].pszParamValue,
1327	aParameterNeg[i].cbParamValue);
1328	if (RT_FAILURE(rc))
1329	goto out;
1330	}
1331	fParameterNeg = false;
1332	}
1333
1334	nsg = 3;
1335	transit = true;
1336	break;
1337	case 0x0300: /* full feature phase. */
1338	default:
1339	/* Should never come here. */
1340	AssertMsgFailed(("send: Undefined login state %d substate %d\n", csg, substate));
1341	break;
1342	}
1343
1344	aReqBHS[0] = RT_H2N_U32( ISCSI_IMMEDIATE_DELIVERY_BIT
1345	\| (csg << ISCSI_CSG_SHIFT)
1346	\| (transit ? (nsg << ISCSI_NSG_SHIFT \| ISCSI_TRANSIT_BIT) : 0)
1347	\| ISCSI_MY_VERSION /* Minimum version. */
1348	\| (ISCSI_MY_VERSION << 8) /* Maximum version. */
1349	\| ISCSIOP_LOGIN_REQ); /* C=0 */
1350	aReqBHS[1] = RT_H2N_U32((uint32_t)cbBuf); /* TotalAHSLength=0 */
1351	aReqBHS[2] = RT_H2N_U32(isid_tsih >> 32);
1352	aReqBHS[3] = RT_H2N_U32(isid_tsih & 0xffffffff);
1353	aReqBHS[4] = itt;
1354	aReqBHS[5] = RT_H2N_U32(1 << 16); /* CID=1,reserved */
1355	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1356	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1357	aReqBHS[8] = 0; /* reserved */
1358	aReqBHS[9] = 0; /* reserved */
1359	aReqBHS[10] = 0; /* reserved */
1360	aReqBHS[11] = 0; /* reserved */
1361
1362	cnISCSIReq = 0;
1363	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1364	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1365	cnISCSIReq++;
1366
1367	aISCSIReq[cnISCSIReq].pcvSeg = bBuf;
1368	aISCSIReq[cnISCSIReq].cbSeg = cbBuf;
1369	cnISCSIReq++;
1370
1371	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
1372	if (RT_SUCCESS(rc))
1373	{
1374	ISCSIOPCODE cmd;
1375	ISCSILOGINSTATUSCLASS loginStatusClass;
1376
1377	cnISCSIRes = 0;
1378	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1379	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1380	cnISCSIRes++;
1381	aISCSIRes[cnISCSIRes].pvSeg = bBuf;
1382	aISCSIRes[cnISCSIRes].cbSeg = sizeof(bBuf);
1383	cnISCSIRes++;
1384
1385	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes);
1386	if (RT_FAILURE(rc))
1387	break;
1388	/** @todo collect partial login responses with Continue bit set. */
1389	Assert(aISCSIRes[0].pvSeg == aResBHS);
1390	Assert(aISCSIRes[0].cbSeg >= ISCSI_BHS_SIZE);
1391	Assert((RT_N2H_U32(aResBHS[0]) & ISCSI_CONTINUE_BIT) == 0);
1392
1393	cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
1394	if (cmd == ISCSIOP_LOGIN_RES)
1395	{
1396	if ((RT_N2H_U32(aResBHS[0]) & 0xff) != ISCSI_MY_VERSION)
1397	{
1398	iscsiTransportClose(pImage);
1399	rc = VERR_PARSE_ERROR;
1400	break; /* Give up immediately, as a RFC violation in version fields is very serious. */
1401	}
1402
1403	loginStatusClass = (ISCSILOGINSTATUSCLASS)(RT_N2H_U32(aResBHS[9]) >> 24);
1404	switch (loginStatusClass)
1405	{
1406	case ISCSI_LOGIN_STATUS_CLASS_SUCCESS:
1407	uint32_t targetCSG;
1408	uint32_t targetNSG;
1409	bool targetTransit;
1410
1411	if (pImage->FirstRecvPDU)
1412	{
1413	pImage->FirstRecvPDU = false;
1414	pImage->ExpStatSN = RT_N2H_U32(aResBHS[6]) + 1;
1415	}
1416
1417	targetCSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_CSG_MASK) >> ISCSI_CSG_SHIFT;
1418	targetNSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_NSG_MASK) >> ISCSI_NSG_SHIFT;
1419	targetTransit = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_TRANSIT_BIT);
1420
1421	/* Handle all cases with a single switch statement. */
1422	switch (csg << 8 \| substate)
1423	{
1424	case 0x0000: /* security negotiation, step 0: receive final authentication. */
1425	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1426	if (RT_FAILURE(rc))
1427	break;
1428
1429	const char *pcszAuthMethod;
1430
1431	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "AuthMethod", &pcszAuthMethod);
1432	if (RT_FAILURE(rc))
1433	{
1434	rc = VERR_PARSE_ERROR;
1435	break;
1436	}
1437	if (strcmp(pcszAuthMethod, "None") == 0)
1438	{
1439	/* Authentication offered, but none required. Skip to operational parameters. */
1440	csg = 1;
1441	nsg = 1;
1442	transit = true;
1443	substate = 0;
1444	break;
1445	}
1446	else if (strcmp(pcszAuthMethod, "CHAP") == 0 && targetNSG == 0 && !targetTransit)
1447	{
1448	/* CHAP authentication required, continue with next substate. */
1449	substate++;
1450	break;
1451	}
1452
1453	/* Unknown auth method or login response PDU headers incorrect. */
1454	rc = VERR_PARSE_ERROR;
1455	break;
1456	case 0x0001: /* security negotiation, step 1: receive final CHAP variant and challenge. */
1457	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1458	if (RT_FAILURE(rc))
1459	break;
1460
1461	const char *pcszChapAuthMethod;
1462	const char *pcszChapIdxTarget;
1463	const char *pcszChapChallengeStr;
1464
1465	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_A", &pcszChapAuthMethod);
1466	if (RT_FAILURE(rc))
1467	{
1468	rc = VERR_PARSE_ERROR;
1469	break;
1470	}
1471	if (strcmp(pcszChapAuthMethod, "5") != 0)
1472	{
1473	rc = VERR_PARSE_ERROR;
1474	break;
1475	}
1476	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_I", &pcszChapIdxTarget);
1477	if (RT_FAILURE(rc))
1478	{
1479	rc = VERR_PARSE_ERROR;
1480	break;
1481	}
1482	rc = RTStrToUInt8Ex(pcszChapIdxTarget, &pszNext, 0, &bChapIdx);
1483	if ((rc > VINF_SUCCESS) \|\| *pszNext != '\0')
1484	{
1485	rc = VERR_PARSE_ERROR;
1486	break;
1487	}
1488	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_C", &pcszChapChallengeStr);
1489	if (RT_FAILURE(rc))
1490	{
1491	rc = VERR_PARSE_ERROR;
1492	break;
1493	}
1494	cbChallenge = sizeof(pbChallenge);
1495	rc = iscsiStrToBinary(pcszChapChallengeStr, pbChallenge, &cbChallenge);
1496	if (RT_FAILURE(rc))
1497	break;
1498	substate++;
1499	transit = true;
1500	break;
1501	case 0x0002: /* security negotiation, step 2: check authentication success. */
1502	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1503	if (RT_FAILURE(rc))
1504	break;
1505
1506	if (targetCSG == 0 && targetNSG == 1 && targetTransit)
1507	{
1508	/* Target wants to continue in login operational state, authentication success. */
1509	csg = 1;
1510	nsg = 3;
1511	substate = 0;
1512	break;
1513	}
1514	rc = VERR_PARSE_ERROR;
1515	break;
1516	case 0x0100: /* login operational negotiation, step 0: check results. */
1517	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1518	if (RT_FAILURE(rc))
1519	break;
1520
1521	if (targetCSG == 1 && targetNSG == 3 && targetTransit)
1522	{
1523	/* Target wants to continue in full feature phase, login finished. */
1524	csg = 3;
1525	nsg = 3;
1526	substate = 0;
1527	break;
1528	}
1529	else if (targetCSG == 1 && targetNSG == 1 && !targetTransit)
1530	{
1531	/* Target wants to negotiate certain parameters and
1532	* stay in login operational negotiation. */
1533	csg = 1;
1534	nsg = 3;
1535	substate = 0;
1536	}
1537	rc = VERR_PARSE_ERROR;
1538	break;
1539	case 0x0300: /* full feature phase. */
1540	default:
1541	AssertMsgFailed(("recv: Undefined login state %d substate %d\n", csg, substate));
1542	rc = VERR_PARSE_ERROR;
1543	break;
1544	}
1545	break;
1546	case ISCSI_LOGIN_STATUS_CLASS_REDIRECTION:
1547	const char *pcszTargetRedir;
1548
1549	/* Target has moved to some other location, as indicated in the TargetAddress key. */
1550	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "TargetAddress", &pcszTargetRedir);
1551	if (RT_FAILURE(rc))
1552	{
1553	rc = VERR_PARSE_ERROR;
1554	break;
1555	}
1556	if (pImage->pszTargetAddress)
1557	RTMemFree(pImage->pszTargetAddress);
1558	{
1559	size_t cb = strlen(pcszTargetRedir) + 1;
1560	pImage->pszTargetAddress = (char *)RTMemAlloc(cb);
1561	if (!pImage->pszTargetAddress)
1562	{
1563	rc = VERR_NO_MEMORY;
1564	break;
1565	}
1566	memcpy(pImage->pszTargetAddress, pcszTargetRedir, cb);
1567	}
1568	rc = iscsiTransportOpen(pImage);
1569	goto restart;
1570	case ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR:
1571	iscsiTransportClose(pImage);
1572	rc = VERR_IO_GEN_FAILURE;
1573	goto out;
1574	case ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR:
1575	iscsiTransportClose(pImage);
1576	rc = VINF_EOF;
1577	break;
1578	default:
1579	rc = VERR_PARSE_ERROR;
1580	}
1581
1582	if (csg == 3)
1583	{
1584	/*
1585	* Finished login, continuing with Full Feature Phase.
1586	*/
1587	rc = VINF_SUCCESS;
1588	break;
1589	}
1590	}
1591	else
1592	{
1593	AssertMsgFailed(("%s: ignoring unexpected PDU with first word = %#08x\n", __FUNCTION__, RT_N2H_U32(aResBHS[0])));
1594	}
1595	}
1596	else
1597	break;
1598	} while (true);
1599
1600	out:
1601	if (RT_FAILURE(rc))
1602	{
1603	/*
1604	* Close connection to target.
1605	*/
1606	iscsiTransportClose(pImage);
1607	pImage->state = ISCSISTATE_FREE;
1608	}
1609	else
1610	pImage->state = ISCSISTATE_NORMAL;
1611
1612	RTSemMutexRelease(pImage->Mutex);
1613
1614	LogFlowFunc(("returning %Rrc\n", rc));
1615	LogRel(("iSCSI: login to target %s %s\n", pImage->pszTargetName, RT_SUCCESS(rc) ? "successful" : "failed"));
1616	return rc;
1617	}
1618
1619
1620	/**
1621	* Detach from an iSCSI target.
1622	*
1623	* @returns VBox status.
1624	* @param pImage The iSCSI connection state to be used.
1625	*/
1626	static int iscsiDetach(void *pvUser)
1627	{
1628	int rc;
1629	uint32_t itt;
1630	uint32_t cnISCSIReq = 0;
1631	ISCSIREQ aISCSIReq[4];
1632	uint32_t aReqBHS[12];
1633	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
1634
1635	LogFlowFunc(("entering\n"));
1636
1637	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1638
1639	if (pImage->state != ISCSISTATE_FREE && pImage->state != ISCSISTATE_IN_LOGOUT)
1640	{
1641	pImage->state = ISCSISTATE_IN_LOGOUT;
1642
1643	/*
1644	* Send logout request to target.
1645	*/
1646	itt = iscsiNewITT(pImage);
1647	aReqBHS[0] = RT_H2N_U32(ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_REQ); /* I=0,F=1,Reason=close session */
1648	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
1649	aReqBHS[2] = 0; /* reserved */
1650	aReqBHS[3] = 0; /* reserved */
1651	aReqBHS[4] = itt;
1652	aReqBHS[5] = 0; /* reserved */
1653	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1654	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1655	aReqBHS[8] = 0; /* reserved */
1656	aReqBHS[9] = 0; /* reserved */
1657	aReqBHS[10] = 0; /* reserved */
1658	aReqBHS[11] = 0; /* reserved */
1659	pImage->CmdSN++;
1660
1661	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1662	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1663	cnISCSIReq++;
1664
1665	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
1666	if (RT_SUCCESS(rc))
1667	{
1668	/*
1669	* Read logout response from target.
1670	*/
1671	ISCSIRES aISCSIRes;
1672	uint32_t aResBHS[12];
1673
1674	aISCSIRes.pvSeg = aResBHS;
1675	aISCSIRes.cbSeg = sizeof(aResBHS);
1676	rc = iscsiRecvPDU(pImage, itt, &aISCSIRes, 1);
1677	if (RT_SUCCESS(rc))
1678	{
1679	if (RT_N2H_U32(aResBHS[0]) != (ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_RES))
1680	AssertMsgFailed(("iSCSI Logout response invalid\n"));
1681	}
1682	else
1683	AssertMsgFailed(("iSCSI Logout response error, rc=%Rrc\n", rc));
1684	}
1685	else
1686	AssertMsgFailed(("Could not send iSCSI Logout request, rc=%Rrc\n", rc));
1687	}
1688
1689	if (pImage->state != ISCSISTATE_FREE)
1690	{
1691	/*
1692	* Close connection to target.
1693	*/
1694	rc = iscsiTransportClose(pImage);
1695	if (RT_FAILURE(rc))
1696	AssertMsgFailed(("Could not close connection to target, rc=%Rrc\n", rc));
1697	}
1698
1699	pImage->state = ISCSISTATE_FREE;
1700
1701	RTSemMutexRelease(pImage->Mutex);
1702
1703	LogFlowFunc(("leaving\n"));
1704	LogRel(("iSCSI: logout to target %s\n", pImage->pszTargetName));
1705	return VINF_SUCCESS;
1706	}
1707
1708
1709	/**
1710	* Perform a command on an iSCSI target. Target must be already in
1711	* Full Feature Phase.
1712	*
1713	* @returns VBOX status.
1714	* @param pImage The iSCSI connection state to be used.
1715	* @param pRequest Command descriptor. Contains all information about
1716	* the command, its transfer directions and pointers
1717	* to the buffer(s) used for transferring data and
1718	* status information.
1719	*/
1720	static int iscsiCommand(PISCSIIMAGE pImage, PSCSIREQ pRequest)
1721	{
1722	int rc;
1723	uint32_t itt;
1724	uint32_t cbData;
1725	uint32_t cnISCSIReq = 0;
1726	ISCSIREQ aISCSIReq[4];
1727	uint32_t aReqBHS[12];
1728
1729	uint32_t *pDst = NULL;
1730	size_t cbBufLength;
1731	uint32_t aStatus[256]; /*< Plenty of buffer for status information. /
1732	uint32_t ExpDataSN = 0;
1733	bool final = false;
1734
1735
1736	LogFlowFunc(("entering, CmdSN=%d\n", pImage->CmdSN));
1737
1738	Assert(pRequest->enmXfer != SCSIXFER_TO_FROM_TARGET); /*< @todo not yet supported, would require AHS. /
1739	Assert(pRequest->cbI2TData <= 0xffffff); /* larger transfers would require R2T support. */
1740	Assert(pRequest->cbCDB <= 16); /* would cause buffer overrun below. */
1741
1742	/* If not in normal state, then the transport connection was dropped. Try
1743	* to reestablish by logging in, the target might be responsive again. */
1744	if (pImage->state == ISCSISTATE_FREE)
1745	rc = iscsiAttach(pImage);
1746
1747	/* If still not in normal state, then the underlying transport connection
1748	* cannot be established. Get out before bad things happen (and make
1749	* sure the caller suspends the VM again). */
1750	if (pImage->state != ISCSISTATE_NORMAL)
1751	{
1752	rc = VERR_NET_CONNECTION_REFUSED;
1753	goto out;
1754	}
1755
1756	/*
1757	* Send SCSI command to target with all I2T data included.
1758	*/
1759	cbData = 0;
1760	if (pRequest->enmXfer == SCSIXFER_FROM_TARGET)
1761	cbData = (uint32_t)pRequest->cbT2IData;
1762	else
1763	cbData = (uint32_t)pRequest->cbI2TData;
1764
1765	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1766
1767	itt = iscsiNewITT(pImage);
1768	memset(aReqBHS, 0, sizeof(aReqBHS));
1769	aReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_ORDERED \| ISCSIOP_SCSI_CMD
1770	\| (pRequest->enmXfer << 21)); /* I=0,F=1,Attr=Ordered */
1771	aReqBHS[1] = RT_H2N_U32(0x00000000 \| ((uint32_t)pRequest->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
1772	aReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
1773	aReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
1774	aReqBHS[4] = itt;
1775	aReqBHS[5] = RT_H2N_U32(cbData);
1776	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1777	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1778	memcpy(aReqBHS + 8, pRequest->pvCDB, pRequest->cbCDB);
1779	pImage->CmdSN++;
1780
1781	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1782	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1783	cnISCSIReq++;
1784
1785	if ( pRequest->enmXfer == SCSIXFER_TO_TARGET
1786	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1787	{
1788	Assert(pRequest->cI2TSegs == 1);
1789	aISCSIReq[cnISCSIReq].pcvSeg = pRequest->paI2TSegs[0].pvSeg;
1790	aISCSIReq[cnISCSIReq].cbSeg = pRequest->paI2TSegs[0].cbSeg; /* Padding done by transport. */
1791	cnISCSIReq++;
1792	}
1793
1794	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_DEFAULT);
1795	if (RT_FAILURE(rc))
1796	goto out_release;
1797
1798	/* Place SCSI request in queue. */
1799	pImage->paCurrReq = aISCSIReq;
1800	pImage->cnCurrReq = cnISCSIReq;
1801
1802	/*
1803	* Read SCSI response/data in PDUs from target.
1804	*/
1805	if ( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1806	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1807	{
1808	Assert(pRequest->cT2ISegs == 1);
1809	pDst = (uint32_t *)pRequest->paT2ISegs[0].pvSeg;
1810	cbBufLength = pRequest->paT2ISegs[0].cbSeg;
1811	}
1812	else
1813	cbBufLength = 0;
1814
1815	do {
1816	uint32_t cnISCSIRes = 0;
1817	ISCSIRES aISCSIRes[4];
1818	uint32_t aResBHS[12];
1819
1820	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1821	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1822	cnISCSIRes++;
1823	if (cbBufLength != 0 &&
1824	( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1825	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET))
1826	{
1827	aISCSIRes[cnISCSIRes].pvSeg = pDst;
1828	aISCSIRes[cnISCSIRes].cbSeg = cbBufLength;
1829	cnISCSIRes++;
1830	}
1831	/* Always reserve space for the status - it's impossible to tell
1832	* beforehand whether this will be the final PDU or not. */
1833	aISCSIRes[cnISCSIRes].pvSeg = aStatus;
1834	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aStatus);
1835	cnISCSIRes++;
1836
1837	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes);
1838	if (RT_FAILURE(rc))
1839	break;
1840
1841	final = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_FINAL_BIT);
1842	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
1843	if (cmd == ISCSIOP_SCSI_RES)
1844	{
1845	/* This is the final PDU which delivers the status (and may be omitted if
1846	* the last Data-In PDU included successful completion status). Note
1847	* that ExpStatSN has been bumped already in iscsiRecvPDU. */
1848	if (!final \|\| ((RT_N2H_U32(aResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(aResBHS[6]) != pImage->ExpStatSN - 1))
1849	{
1850	/* SCSI Response in the wrong place or with a (target) failure. */
1851	rc = VERR_PARSE_ERROR;
1852	break;
1853	}
1854	/* The following is a bit tricky, as in error situations we may
1855	* get the status only instead of the result data plus optional
1856	* status. Thus the status may have ended up partially in the
1857	* data area. */
1858	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
1859	cbData = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
1860	if (cbData >= 2)
1861	{
1862	uint32_t cbStat = RT_N2H_U32(((uint32_t *)aISCSIRes[1].pvSeg)[0]) >> 16;
1863	if (cbStat + 2 > cbData)
1864	{
1865	rc = VERR_BUFFER_OVERFLOW;
1866	break;
1867	}
1868	/* Truncate sense data if it doesn't fit into the buffer. */
1869	pRequest->cbSense = RT_MIN(cbStat, pRequest->cbSense);
1870	memcpy(pRequest->pvSense,
1871	((const char *)aISCSIRes[1].pvSeg) + 2,
1872	RT_MIN(aISCSIRes[1].cbSeg - 2, pRequest->cbSense));
1873	if ( cnISCSIRes > 2 && aISCSIRes[2].cbSeg
1874	&& (ssize_t)pRequest->cbSense - aISCSIRes[1].cbSeg + 2 > 0)
1875	{
1876	memcpy((char *)pRequest->pvSense + aISCSIRes[1].cbSeg - 2,
1877	aISCSIRes[2].pvSeg,
1878	pRequest->cbSense - aISCSIRes[1].cbSeg + 2);
1879	}
1880	}
1881	else if (cbData == 1)
1882	{
1883	rc = VERR_PARSE_ERROR;
1884	break;
1885	}
1886	else
1887	pRequest->cbSense = 0;
1888	break;
1889	}
1890	else if (cmd == ISCSIOP_SCSI_DATA_IN)
1891	{
1892	/* A Data-In PDU carries some data that needs to be added to the received
1893	* data in response to the command. There may be both partial and complete
1894	* Data-In PDUs, so collect data until the status is included or the status
1895	* is sent in a separate SCSI Result frame (see above). */
1896	if (final && aISCSIRes[2].cbSeg != 0)
1897	{
1898	/* The received PDU is partially stored in the buffer for status.
1899	* Must not happen under normal circumstances and is a target error. */
1900	rc = VERR_BUFFER_OVERFLOW;
1901	break;
1902	}
1903	uint32_t len = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
1904	pDst = (uint32_t )((char )pDst + len);
1905	cbBufLength -= len;
1906	ExpDataSN++;
1907	if (final && (RT_N2H_U32(aResBHS[0]) & ISCSI_STATUS_BIT) != 0)
1908	{
1909	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
1910	pRequest->cbSense = 0;
1911	break;
1912	}
1913	}
1914	else
1915	{
1916	rc = VERR_PARSE_ERROR;
1917	break;
1918	}
1919	} while (true);
1920
1921	/* Remove SCSI request from queue. */
1922	pImage->paCurrReq = NULL;
1923	pImage->cnCurrReq = 0;
1924
1925	out_release:
1926	if (rc == VERR_TIMEOUT)
1927	{
1928	/* Drop connection in case the target plays dead. Much better than
1929	* delaying the next requests until the timed out command actually
1930	* finishes. Also keep in mind that command shouldn't take longer than
1931	* about 30-40 seconds, or the guest will lose its patience. */
1932	iscsiTransportClose(pImage);
1933	pImage->state = ISCSISTATE_FREE;
1934	rc = VERR_BROKEN_PIPE;
1935	}
1936	RTSemMutexRelease(pImage->Mutex);
1937
1938	out:
1939	LogFlowFunc(("returns %Rrc\n", rc));
1940	return rc;
1941	}
1942
1943
1944	/**
1945	* Generate a new Initiator Task Tag.
1946	*
1947	* @returns Initiator Task Tag.
1948	* @param pImage The iSCSI connection state to be used.
1949	*/
1950	static uint32_t iscsiNewITT(PISCSIIMAGE pImage)
1951	{
1952	uint32_t next_itt;
1953
1954	next_itt = pImage->ITT++;
1955	if (pImage->ITT == ISCSI_TASK_TAG_RSVD)
1956	pImage->ITT = 0;
1957	return RT_H2N_U32(next_itt);
1958	}
1959
1960
1961	/**
1962	* Send an iSCSI request. The request can consist of several segments, which
1963	* are padded to 4 byte boundaries and concatenated.
1964	*
1965	* @returns VBOX status
1966	* @param pImage The iSCSI connection state to be used.
1967	* @param paReq Pointer to array of iSCSI request sections.
1968	* @param cnReq Number of valid iSCSI request sections in the array.
1969	* @param uFlags Flags controlling the exact send semantics.
1970	*/
1971	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq,
1972	uint32_t uFlags)
1973	{
1974	int rc = VINF_SUCCESS;
1975	/** @todo return VERR_VD_ISCSI_INVALID_STATE in the appropriate situations,
1976	* needs cleaning up of timeout/disconnect handling a bit, as otherwise
1977	* too many incorrect errors are signalled. */
1978	Assert(cnReq >= 1);
1979	Assert(paReq[0].cbSeg >= ISCSI_BHS_SIZE);
1980
1981	for (uint32_t i = 0; i < pImage->cISCSIRetries; i++)
1982	{
1983	rc = iscsiTransportWrite(pImage, paReq, cnReq);
1984	if (RT_SUCCESS(rc))
1985	break;
1986	if ( (uFlags & ISCSIPDU_NO_REATTACH)
1987	\|\| (rc != VERR_BROKEN_PIPE && rc != VERR_NET_CONNECTION_REFUSED))
1988	break;
1989	/* No point in reestablishing the connection for a logout */
1990	if (pImage->state == ISCSISTATE_IN_LOGOUT)
1991	break;
1992	RTThreadSleep(500);
1993	if (pImage->state != ISCSISTATE_IN_LOGIN)
1994	{
1995	/* Attempt to re-login when a connection fails, but only when not
1996	* currently logging in. */
1997	rc = iscsiAttach(pImage);
1998	if (RT_FAILURE(rc))
1999	break;
2000	}
2001	}
2002	return rc;
2003	}
2004
2005
2006	/**
2007	* Wait for an iSCSI response with a matching Initiator Target Tag. The response is
2008	* split into several segments, as requested by the caller-provided buffer specification.
2009	* Remember that the response can be split into several PDUs by the sender, so make
2010	* sure that all parts are collected and processed appropriately by the caller.
2011	*
2012	* @returns VBOX status
2013	* @param pImage The iSCSI connection state to be used.
2014	* @param paRes Pointer to array of iSCSI response sections.
2015	* @param cnRes Number of valid iSCSI response sections in the array.
2016	*/
2017	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes)
2018	{
2019	int rc = VINF_SUCCESS;
2020	ISCSIRES aResBuf;
2021
2022	for (uint32_t i = 0; i < pImage->cISCSIRetries; i++)
2023	{
2024	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
2025	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
2026	rc = iscsiTransportRead(pImage, &aResBuf, 1);
2027	if (RT_FAILURE(rc))
2028	{
2029	if (rc == VERR_BROKEN_PIPE \|\| rc == VERR_NET_CONNECTION_REFUSED)
2030	{
2031	/* No point in reestablishing the connection for a logout */
2032	if (pImage->state == ISCSISTATE_IN_LOGOUT)
2033	break;
2034	/* Connection broken while waiting for a response - wait a while and
2035	* try to restart by re-sending the original request (if any).
2036	* This also handles the connection reestablishment (login etc.). */
2037	RTThreadSleep(500);
2038	if (pImage->state != ISCSISTATE_IN_LOGIN)
2039	{
2040	/* Attempt to re-login when a connection fails, but only when not
2041	* currently logging in. */
2042	rc = iscsiAttach(pImage);
2043	if (RT_FAILURE(rc))
2044	break;
2045	}
2046	if (pImage->paCurrReq != NULL)
2047	{
2048	rc = iscsiSendPDU(pImage, pImage->paCurrReq, pImage->cnCurrReq, ISCSIPDU_DEFAULT);
2049	if (RT_FAILURE(rc))
2050	break;
2051	}
2052	}
2053	else
2054	{
2055	/* Signal other errors (VERR_BUFFER_OVERFLOW etc.) to the caller. */
2056	break;
2057	}
2058	}
2059	else
2060	{
2061	ISCSIOPCODE cmd;
2062	const uint32_t pcvResSeg = (const uint32_t )aResBuf.pvSeg;
2063
2064	/* Check whether the received PDU is valid, and update the internal state of
2065	* the iSCSI connection/session. */
2066	rc = iscsiValidatePDU(&aResBuf, 1);
2067	if (RT_FAILURE(rc))
2068	continue;
2069	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
2070	switch (cmd)
2071	{
2072	case ISCSIOP_SCSI_RES:
2073	case ISCSIOP_SCSI_TASKMGMT_RES:
2074	case ISCSIOP_SCSI_DATA_IN:
2075	case ISCSIOP_R2T:
2076	case ISCSIOP_ASYN_MSG:
2077	case ISCSIOP_TEXT_RES:
2078	case ISCSIOP_LOGIN_RES:
2079	case ISCSIOP_LOGOUT_RES:
2080	case ISCSIOP_REJECT:
2081	case ISCSIOP_NOP_IN:
2082	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
2083	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
2084	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
2085	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
2086	break;
2087	default:
2088	rc = VERR_PARSE_ERROR;
2089	}
2090	if (RT_FAILURE(rc))
2091	continue;
2092	if ( !pImage->FirstRecvPDU
2093	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT)))
2094	{
2095	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
2096	{
2097	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
2098	if ( (cmd != ISCSIOP_R2T)
2099	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
2100	pImage->ExpStatSN++;
2101	}
2102	else
2103	{
2104	rc = VERR_PARSE_ERROR;
2105	continue;
2106	}
2107	}
2108	/* Finally check whether the received PDU matches what the caller wants. */
2109	if ( itt == pcvResSeg[4]
2110	&& itt != ISCSI_TASK_TAG_RSVD)
2111	{
2112	/* Copy received PDU (one segment) to caller-provided buffers. */
2113	uint32_t j;
2114	size_t cbSeg;
2115	const uint8_t *pSrc;
2116
2117	pSrc = (const uint8_t *)aResBuf.pvSeg;
2118	cbSeg = aResBuf.cbSeg;
2119	for (j = 0; j < cnRes; j++)
2120	{
2121	if (cbSeg > paRes[j].cbSeg)
2122	{
2123	memcpy(paRes[j].pvSeg, pSrc, paRes[j].cbSeg);
2124	pSrc += paRes[j].cbSeg;
2125	cbSeg -= paRes[j].cbSeg;
2126	}
2127	else
2128	{
2129	memcpy(paRes[j].pvSeg, pSrc, cbSeg);
2130	paRes[j].cbSeg = cbSeg;
2131	cbSeg = 0;
2132	break;
2133	}
2134	}
2135	if (cbSeg != 0)
2136	{
2137	rc = VERR_BUFFER_OVERFLOW;
2138	break;
2139	}
2140	for (j++; j < cnRes; j++)
2141	paRes[j].cbSeg = 0;
2142	break;
2143	}
2144	else if ( cmd == ISCSIOP_NOP_IN
2145	&& RT_N2H_U32(pcvResSeg[5]) != ISCSI_TASK_TAG_RSVD)
2146	{
2147	uint32_t cnISCSIReq;
2148	ISCSIREQ aISCSIReq[4];
2149	uint32_t aReqBHS[12];
2150
2151	aReqBHS[0] = RT_H2N_U32(ISCSI_IMMEDIATE_DELIVERY_BIT \| ISCSI_FINAL_BIT \| ISCSIOP_NOP_OUT);
2152	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
2153	aReqBHS[2] = pcvResSeg[2]; /* copy LUN from NOP-In */
2154	aReqBHS[3] = pcvResSeg[3]; /* copy LUN from NOP-In */
2155	aReqBHS[4] = RT_H2N_U32(ISCSI_TASK_TAG_RSVD); /* ITT, reply */
2156	aReqBHS[5] = pcvResSeg[5]; /* copy TTT from NOP-In */
2157	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2158	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2159	aReqBHS[8] = 0; /* reserved */
2160	aReqBHS[9] = 0; /* reserved */
2161	aReqBHS[10] = 0; /* reserved */
2162	aReqBHS[11] = 0; /* reserved */
2163
2164	cnISCSIReq = 0;
2165	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
2166	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
2167	cnISCSIReq++;
2168
2169	iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
2170	/* Break if the caller wanted to process the NOP-in only. */
2171	if (itt == ISCSI_TASK_TAG_RSVD)
2172	break;
2173	}
2174	}
2175	}
2176	return rc;
2177	}
2178
2179
2180	/**
2181	* Reset the PDU buffer
2182	*
2183	* @param pImage The iSCSI connection state to be used.
2184	*/
2185	static void iscsiRecvPDUReset(PISCSIIMAGE pImage)
2186	{
2187	pImage->cbRecvPDUResidual = ISCSI_BHS_SIZE;
2188	pImage->fRecvPDUBHS = true;
2189	pImage->pbRecvPDUBufCur = (uint8_t *)pImage->pvRecvPDUBuf;
2190	}
2191
2192	static void iscsiPDUTxAdd(PISCSIIMAGE pImage, PISCSIPDUTX pIScsiPDUTx, bool fFront)
2193	{
2194	if (!fFront)
2195	{
2196	/* Insert PDU at the tail of the list. */
2197	if (!pImage->pIScsiPDUTxHead)
2198	pImage->pIScsiPDUTxHead = pIScsiPDUTx;
2199	else
2200	pImage->pIScsiPDUTxTail->pNext = pIScsiPDUTx;
2201	pImage->pIScsiPDUTxTail = pIScsiPDUTx;
2202	}
2203	else
2204	{
2205	/* Insert PDU at the beginning of the list. */
2206	pIScsiPDUTx->pNext = pImage->pIScsiPDUTxHead;
2207	pImage->pIScsiPDUTxHead = pIScsiPDUTx;
2208	if (!pImage->pIScsiPDUTxTail)
2209	pImage->pIScsiPDUTxTail = pIScsiPDUTx;
2210	}
2211	}
2212
2213	/**
2214	* Receives a PDU in a non blocking way.
2215	*
2216	* @returns VBOX status code.
2217	* @param pImage The iSCSI connection state to be used.
2218	*/
2219	static int iscsiRecvPDUAsync(PISCSIIMAGE pImage)
2220	{
2221	size_t cbActuallyRead = 0;
2222	int rc = VINF_SUCCESS;
2223
2224	LogFlowFunc(("pImage=%#p\n", pImage));
2225
2226	/* Check if we are in the middle of a PDU receive. */
2227	if (pImage->cbRecvPDUResidual == 0)
2228	{
2229	/*
2230	* We are receiving a new PDU, don't read more than the BHS initially
2231	* until we know the real size of the PDU.
2232	*/
2233	iscsiRecvPDUReset(pImage);
2234	LogFlow(("Receiving new PDU\n"));
2235	}
2236
2237	rc = pImage->pIfNet->pfnReadNB(pImage->Socket, pImage->pbRecvPDUBufCur,
2238	pImage->cbRecvPDUResidual, &cbActuallyRead);
2239	if (RT_SUCCESS(rc) && cbActuallyRead == 0)
2240	rc = VERR_BROKEN_PIPE;
2241
2242	if (RT_SUCCESS(rc))
2243	{
2244	LogFlow(("Received %zu bytes\n", cbActuallyRead));
2245	pImage->cbRecvPDUResidual -= cbActuallyRead;
2246	pImage->pbRecvPDUBufCur += cbActuallyRead;
2247
2248	/* Check if we received everything we wanted. */
2249	if ( !pImage->cbRecvPDUResidual
2250	&& pImage->fRecvPDUBHS)
2251	{
2252	size_t cbAHSLength, cbDataLength;
2253
2254	/* If we were reading the BHS first get the actual PDU size now. */
2255	uint32_t word1 = RT_N2H_U32(((uint32_t *)(pImage->pvRecvPDUBuf))[1]);
2256	cbAHSLength = (word1 & 0xff000000) >> 24;
2257	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
2258	cbDataLength = word1 & 0x00ffffff;
2259	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
2260	pImage->cbRecvPDUResidual = cbAHSLength + cbDataLength;
2261	pImage->fRecvPDUBHS = false; /* Start receiving the rest of the PDU. */
2262	}
2263
2264	if (!pImage->cbRecvPDUResidual)
2265	{
2266	/* We received the complete PDU with or without any payload now. */
2267	LogFlow(("Received complete PDU\n"));
2268	ISCSIRES aResBuf;
2269	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
2270	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
2271	rc = iscsiRecvPDUProcess(pImage, &aResBuf, 1);
2272	}
2273	}
2274	else
2275	LogFlowFunc(("Reading from the socket returned with rc=%Rrc\n", rc));
2276
2277	return rc;
2278	}
2279
2280	static int iscsiSendPDUAsync(PISCSIIMAGE pImage)
2281	{
2282	size_t cbSent = 0;
2283	int rc = VINF_SUCCESS;
2284
2285	LogFlowFunc(("pImage=%#p\n", pImage));
2286
2287	do
2288	{
2289	/*
2290	* If there is no PDU active, get the first one from the list.
2291	* Check that we are allowed to transfer the PDU by comparing the
2292	* command sequence number and the maximum sequence number allowed by the target.
2293	*/
2294	if (!pImage->pIScsiPDUTxCur)
2295	{
2296	if ( !pImage->pIScsiPDUTxHead
2297	\|\| serial_number_greater(pImage->pIScsiPDUTxHead->CmdSN, pImage->MaxCmdSN))
2298	break;
2299
2300	pImage->pIScsiPDUTxCur = pImage->pIScsiPDUTxHead;
2301	pImage->pIScsiPDUTxHead = pImage->pIScsiPDUTxCur->pNext;
2302	if (!pImage->pIScsiPDUTxHead)
2303	pImage->pIScsiPDUTxTail = NULL;
2304	}
2305
2306	/* Send as much as we can. */
2307	rc = pImage->pIfNet->pfnSgWriteNB(pImage->Socket, &pImage->pIScsiPDUTxCur->SgBuf, &cbSent);
2308	LogFlow(("SgWriteNB returned rc=%Rrc cbSent=%zu\n", rc, cbSent));
2309	if (RT_SUCCESS(rc))
2310	{
2311	LogFlow(("Sent %zu bytes for PDU %#p\n", cbSent, pImage->pIScsiPDUTxCur));
2312	pImage->pIScsiPDUTxCur->cbSgLeft -= cbSent;
2313	RTSgBufAdvance(&pImage->pIScsiPDUTxCur->SgBuf, cbSent);
2314	if (!pImage->pIScsiPDUTxCur->cbSgLeft)
2315	{
2316	/* PDU completed, free it and place the command on the waiting for response list. */
2317	if (pImage->pIScsiPDUTxCur->pIScsiCmd)
2318	{
2319	LogFlow(("Sent complete PDU, placing on waiting list\n"));
2320	iscsiCmdInsert(pImage, pImage->pIScsiPDUTxCur->pIScsiCmd);
2321	}
2322	RTMemFree(pImage->pIScsiPDUTxCur);
2323	pImage->pIScsiPDUTxCur = NULL;
2324	}
2325	}
2326	} while ( RT_SUCCESS(rc)
2327	&& !pImage->pIScsiPDUTxCur);
2328
2329	if (rc == VERR_TRY_AGAIN)
2330	rc = VINF_SUCCESS;
2331
2332	/* Add the write poll flag if we still have something to send, clear it otherwise. */
2333	if (pImage->pIScsiPDUTxCur)
2334	pImage->fPollEvents \|= VD_INTERFACETCPNET_EVT_WRITE;
2335	else
2336	pImage->fPollEvents &= ~VD_INTERFACETCPNET_EVT_WRITE;
2337
2338	LogFlowFunc(("rc=%Rrc pIScsiPDUTxCur=%#p\n", rc, pImage->pIScsiPDUTxCur));
2339	return rc;
2340	}
2341
2342	/**
2343	* Process a received PDU.
2344	*
2345	* @return VBOX status code.
2346	* @param pImage The iSCSI connection state to be used.
2347	* @param paRes Pointer to the array of iSCSI response sections.
2348	* @param cnRes Number of valid iSCSI response sections in the array.
2349	*/
2350	static int iscsiRecvPDUProcess(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes)
2351	{
2352	int rc = VINF_SUCCESS;
2353
2354	LogFlowFunc(("pImage=%#p paRes=%#p cnRes=%u\n", pImage, paRes, cnRes));
2355
2356	/* Validate the PDU first. */
2357	rc = iscsiValidatePDU(paRes, cnRes);
2358	if (RT_SUCCESS(rc))
2359	{
2360	ISCSIOPCODE cmd;
2361	const uint32_t pcvResSeg = (const uint32_t )paRes[0].pvSeg;
2362
2363	Assert(paRes[0].cbSeg > 9 * sizeof(uint32_t));
2364
2365	do
2366	{
2367	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
2368	switch (cmd)
2369	{
2370	case ISCSIOP_SCSI_RES:
2371	case ISCSIOP_SCSI_TASKMGMT_RES:
2372	case ISCSIOP_SCSI_DATA_IN:
2373	case ISCSIOP_R2T:
2374	case ISCSIOP_ASYN_MSG:
2375	case ISCSIOP_TEXT_RES:
2376	case ISCSIOP_LOGIN_RES:
2377	case ISCSIOP_LOGOUT_RES:
2378	case ISCSIOP_REJECT:
2379	case ISCSIOP_NOP_IN:
2380	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
2381	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
2382	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
2383	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
2384	break;
2385	default:
2386	rc = VERR_PARSE_ERROR;
2387	}
2388
2389	if (RT_FAILURE(rc))
2390	break;
2391
2392	if ( !pImage->FirstRecvPDU
2393	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT)))
2394	{
2395	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
2396	{
2397	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
2398	if ( (cmd != ISCSIOP_R2T)
2399	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
2400	pImage->ExpStatSN++;
2401	}
2402	else
2403	{
2404	rc = VERR_PARSE_ERROR;
2405	break;
2406	}
2407	}
2408
2409	if (pcvResSeg[4] != ISCSI_TASK_TAG_RSVD)
2410	{
2411	/*
2412	* This is a response from the target for a request from the initiator.
2413	* Get the request and update its state.
2414	*/
2415	rc = iscsiRecvPDUUpdateRequest(pImage, paRes, cnRes);
2416	/* Try to send more PDUs now that we updated the MaxCmdSN field */
2417	if ( RT_SUCCESS(rc)
2418	&& !pImage->pIScsiPDUTxCur)
2419	rc = iscsiSendPDUAsync(pImage);
2420	}
2421	else
2422	{
2423	/* This is a target initiated request (we handle only NOP-In request at the moment). */
2424	if ( cmd == ISCSIOP_NOP_IN
2425	&& RT_N2H_U32(pcvResSeg[5]) != ISCSI_TASK_TAG_RSVD)
2426	{
2427	PISCSIPDUTX pIScsiPDUTx;
2428	uint32_t cnISCSIReq;
2429	uint32_t *paReqBHS;
2430
2431	LogFlowFunc(("Sending NOP-Out\n"));
2432
2433	/* Allocate a new PDU initialize it and put onto the waiting list. */
2434	pIScsiPDUTx = (PISCSIPDUTX)RTMemAllocZ(sizeof(ISCSIPDUTX));
2435	if (!pIScsiPDUTx)
2436	{
2437	rc = VERR_NO_MEMORY;
2438	break;
2439	}
2440	paReqBHS = &pIScsiPDUTx->aBHS[0];
2441	paReqBHS[0] = RT_H2N_U32(ISCSI_IMMEDIATE_DELIVERY_BIT \| ISCSI_FINAL_BIT \| ISCSIOP_NOP_OUT);
2442	paReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
2443	paReqBHS[2] = pcvResSeg[2]; /* copy LUN from NOP-In */
2444	paReqBHS[3] = pcvResSeg[3]; /* copy LUN from NOP-In */
2445	paReqBHS[4] = RT_H2N_U32(ISCSI_TASK_TAG_RSVD); /* ITT, reply */
2446	paReqBHS[5] = pcvResSeg[5]; /* copy TTT from NOP-In */
2447	paReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2448	paReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2449	paReqBHS[8] = 0; /* reserved */
2450	paReqBHS[9] = 0; /* reserved */
2451	paReqBHS[10] = 0; /* reserved */
2452	paReqBHS[11] = 0; /* reserved */
2453
2454	cnISCSIReq = 0;
2455	pIScsiPDUTx->aISCSIReq[cnISCSIReq].pvSeg = paReqBHS;
2456	pIScsiPDUTx->aISCSIReq[cnISCSIReq].cbSeg = sizeof(pIScsiPDUTx->aBHS);
2457	cnISCSIReq++;
2458	pIScsiPDUTx->cbSgLeft = sizeof(pIScsiPDUTx->aBHS);
2459	RTSgBufInit(&pIScsiPDUTx->SgBuf, pIScsiPDUTx->aISCSIReq, cnISCSIReq);
2460
2461	/*
2462	* Link the PDU to the list.
2463	* Insert at the front of the list to send the response as soon as possible
2464	* to avoid frequent reconnects for a slow connection when there are many PDUs
2465	* waiting.
2466	*/
2467	iscsiPDUTxAdd(pImage, pIScsiPDUTx, true /* fFront */);
2468
2469	/* Start transfer of a PDU if there is no one active at the moment. */
2470	if (!pImage->pIScsiPDUTxCur)
2471	rc = iscsiSendPDUAsync(pImage);
2472	}
2473	}
2474	} while (0);
2475	}
2476
2477	return rc;
2478	}
2479
2480	/**
2481	* Check the static (not dependent on the connection/session state) validity of an iSCSI response PDU.
2482	*
2483	* @returns VBOX status
2484	* @param paRes Pointer to array of iSCSI response sections.
2485	* @param cnRes Number of valid iSCSI response sections in the array.
2486	*/
2487	static int iscsiValidatePDU(PISCSIRES paRes, uint32_t cnRes)
2488	{
2489	const uint32_t *pcrgResBHS;
2490	uint32_t hw0;
2491	Assert(cnRes >= 1);
2492	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
2493
2494	LogFlowFunc(("paRes=%#p cnRes=%u\n", paRes, cnRes));
2495
2496	pcrgResBHS = (const uint32_t *)(paRes[0].pvSeg);
2497	hw0 = RT_N2H_U32(pcrgResBHS[0]);
2498	switch (hw0 & ISCSIOP_MASK)
2499	{
2500	case ISCSIOP_NOP_IN:
2501	/* NOP-In responses must not be split into several PDUs nor it may contain
2502	* ping data for target-initiated pings nor may both task tags be valid task tags. */
2503	if ( (hw0 & ISCSI_FINAL_BIT) == 0
2504	\|\| ( RT_N2H_U32(pcrgResBHS[4]) == ISCSI_TASK_TAG_RSVD
2505	&& RT_N2H_U32(pcrgResBHS[1]) != 0)
2506	\|\| ( RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD
2507	&& RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD))
2508	return VERR_PARSE_ERROR;
2509	break;
2510	case ISCSIOP_SCSI_RES:
2511	/* SCSI responses must not be split into several PDUs nor must the residual
2512	* bits be contradicting each other nor may the residual bits be set for PDUs
2513	* containing anything else but a completed command response. Underflow
2514	* is no reason for declaring a PDU as invalid, as the target may choose
2515	* to return less data than we assume to get. */
2516	if ( (hw0 & ISCSI_FINAL_BIT) == 0
2517	\|\| ((hw0 & ISCSI_BI_READ_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_BI_READ_RESIDUAL_UNFL_BIT))
2518	\|\| ((hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
2519	\|\| ( ((hw0 & ISCSI_SCSI_RESPONSE_MASK) == 0)
2520	&& ((hw0 & ISCSI_SCSI_STATUS_MASK) == SCSI_STATUS_OK)
2521	&& (hw0 & ( ISCSI_BI_READ_RESIDUAL_OVFL_BIT \| ISCSI_BI_READ_RESIDUAL_UNFL_BIT
2522	\| ISCSI_RESIDUAL_OVFL_BIT))))
2523	return VERR_PARSE_ERROR;
2524	break;
2525	case ISCSIOP_LOGIN_RES:
2526	/* Login responses must not contain contradicting transit and continue bits. */
2527	if ((hw0 & ISCSI_CONTINUE_BIT) && ((hw0 & ISCSI_TRANSIT_BIT) != 0))
2528	return VERR_PARSE_ERROR;
2529	break;
2530	case ISCSIOP_TEXT_RES:
2531	/* Text responses must not contain contradicting final and continue bits nor
2532	* may the final bit be set for PDUs containing a target transfer tag other than
2533	* the reserved transfer tag (and vice versa). */
2534	if ( (((hw0 & ISCSI_CONTINUE_BIT) && (hw0 & ISCSI_FINAL_BIT) != 0))
2535	\|\| (((hw0 & ISCSI_FINAL_BIT) && (RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD)))
2536	\|\| (((hw0 & ISCSI_FINAL_BIT) == 0) && (RT_N2H_U32(pcrgResBHS[5]) == ISCSI_TASK_TAG_RSVD)))
2537	return VERR_PARSE_ERROR;
2538	break;
2539	case ISCSIOP_SCSI_DATA_IN:
2540	/* SCSI Data-in responses must not contain contradicting residual bits when
2541	* status bit is set. */
2542	if ((hw0 & ISCSI_STATUS_BIT) && (hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
2543	return VERR_PARSE_ERROR;
2544	break;
2545	case ISCSIOP_LOGOUT_RES:
2546	/* Logout responses must not have the final bit unset and may not contain any
2547	* data or additional header segments. */
2548	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
2549	\|\| (RT_N2H_U32(pcrgResBHS[1]) != 0))
2550	return VERR_PARSE_ERROR;
2551	break;
2552	case ISCSIOP_ASYN_MSG:
2553	/* Asynchronous Messages must not have the final bit unset and may not contain
2554	* an initiator task tag. */
2555	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
2556	\|\| (RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD))
2557	return VERR_PARSE_ERROR;
2558	break;
2559	case ISCSIOP_SCSI_TASKMGMT_RES:
2560	case ISCSIOP_R2T:
2561	case ISCSIOP_REJECT:
2562	default:
2563	/* Do some logging, ignore PDU. */
2564	LogFlowFunc(("ignore unhandled PDU, first word %#08x\n", RT_N2H_U32(pcrgResBHS[0])));
2565	return VERR_PARSE_ERROR;
2566	}
2567	/* A target must not send PDUs with MaxCmdSN less than ExpCmdSN-1. */
2568
2569	if (serial_number_less(RT_N2H_U32(pcrgResBHS[8]), RT_N2H_U32(pcrgResBHS[7])-1))
2570	return VERR_PARSE_ERROR;
2571
2572	return VINF_SUCCESS;
2573	}
2574
2575
2576	/**
2577	* Prepares a PDU to transfer for the given command and adds it to the list.
2578	*/
2579	static int iscsiPDUTxPrepare(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
2580	{
2581	int rc = VINF_SUCCESS;
2582	uint32_t *paReqBHS;
2583	size_t cbData = 0;
2584	size_t cbSegs = 0;
2585	PSCSIREQ pScsiReq;
2586	PISCSIPDUTX pIScsiPDU = NULL;
2587
2588	LogFlowFunc(("pImage=%#p pIScsiCmd=%#p\n", pImage, pIScsiCmd));
2589
2590	Assert(pIScsiCmd->enmCmdType == ISCSICMDTYPE_REQ);
2591
2592	pIScsiCmd->Itt = iscsiNewITT(pImage);
2593	pScsiReq = pIScsiCmd->CmdType.ScsiReq.pScsiReq;
2594
2595	if (pScsiReq->cT2ISegs)
2596	RTSgBufInit(&pScsiReq->SgBufT2I, pScsiReq->paT2ISegs, pScsiReq->cT2ISegs);
2597
2598	/*
2599	* Allocate twice as much entries as required for padding (worst case).
2600	* The additional segment is for the BHS.
2601	*/
2602	size_t cI2TSegs = 2*(pScsiReq->cI2TSegs + 1);
2603	pIScsiPDU = (PISCSIPDUTX)RTMemAllocZ(RT_OFFSETOF(ISCSIPDUTX, aISCSIReq[cI2TSegs]));
2604	if (!pIScsiPDU)
2605	return VERR_NO_MEMORY;
2606
2607	pIScsiPDU->pIScsiCmd = pIScsiCmd;
2608
2609	if (pScsiReq->enmXfer == SCSIXFER_FROM_TARGET)
2610	cbData = (uint32_t)pScsiReq->cbT2IData;
2611	else
2612	cbData = (uint32_t)pScsiReq->cbI2TData;
2613
2614	paReqBHS = pIScsiPDU->aBHS;
2615
2616	/* Setup the BHS. */
2617	paReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_ORDERED \| ISCSIOP_SCSI_CMD
2618	\| (pScsiReq->enmXfer << 21)); /* I=0,F=1,Attr=Ordered */
2619	paReqBHS[1] = RT_H2N_U32(0x00000000 \| ((uint32_t)pScsiReq->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
2620	paReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
2621	paReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
2622	paReqBHS[4] = pIScsiCmd->Itt;
2623	paReqBHS[5] = RT_H2N_U32(cbData);
2624	paReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2625	paReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2626	memcpy(paReqBHS + 8, pScsiReq->pvCDB, pScsiReq->cbCDB);
2627
2628	pIScsiPDU->CmdSN = pImage->CmdSN;
2629	pImage->CmdSN++;
2630
2631	/* Setup the S/G buffers. */
2632	uint32_t cnISCSIReq = 0;
2633	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = sizeof(pIScsiPDU->aBHS);
2634	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = pIScsiPDU->aBHS;
2635	cnISCSIReq++;
2636	cbSegs = sizeof(pIScsiPDU->aBHS);
2637	/* Padding is not necessary for the BHS. */
2638
2639	if (pScsiReq->cbI2TData)
2640	{
2641	for (unsigned cSeg = 0; cSeg < pScsiReq->cI2TSegs; cSeg++)
2642	{
2643	Assert(cnISCSIReq < cI2TSegs);
2644	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = pScsiReq->paI2TSegs[cSeg].cbSeg;
2645	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = pScsiReq->paI2TSegs[cSeg].pvSeg;
2646	cbSegs += pScsiReq->paI2TSegs[cSeg].cbSeg;
2647	cnISCSIReq++;
2648
2649	/* Add padding if necessary. */
2650	if (pScsiReq->paI2TSegs[cSeg].cbSeg & 3)
2651	{
2652	Assert(cnISCSIReq < cI2TSegs);
2653	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = &pImage->aPadding[0];
2654	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = 4 - (pScsiReq->paI2TSegs[cSeg].cbSeg & 3);
2655	cbSegs += pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg;
2656	cnISCSIReq++;
2657	}
2658	}
2659	}
2660
2661	pIScsiPDU->cISCSIReq = cnISCSIReq;
2662	pIScsiPDU->cbSgLeft = cbSegs;
2663	RTSgBufInit(&pIScsiPDU->SgBuf, pIScsiPDU->aISCSIReq, cnISCSIReq);
2664
2665	/* Link the PDU to the list. */
2666	iscsiPDUTxAdd(pImage, pIScsiPDU, false /* fFront */);
2667
2668	/* Start transfer of a PDU if there is no one active at the moment. */
2669	if (!pImage->pIScsiPDUTxCur)
2670	rc = iscsiSendPDUAsync(pImage);
2671
2672	return rc;
2673	}
2674
2675
2676	/**
2677	* Updates the state of a request from the PDU we received.
2678	*
2679	* @return VBox status code.
2680	* @param pImage iSCSI connection state to use.
2681	* @param paRes Pointer to array of iSCSI response sections.
2682	* @param cnRes Number of valid iSCSI response sections in the array.
2683	*/
2684	static int iscsiRecvPDUUpdateRequest(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes)
2685	{
2686	int rc = VINF_SUCCESS;
2687	PISCSICMD pIScsiCmd;
2688	uint32_t *paResBHS;
2689
2690	LogFlowFunc(("pImage=%#p paRes=%#p cnRes=%u\n", pImage, paRes, cnRes));
2691
2692	Assert(cnRes == 1);
2693	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
2694
2695	paResBHS = (uint32_t *)paRes[0].pvSeg;
2696
2697	pIScsiCmd = iscsiCmdGetFromItt(pImage, paResBHS[4]);
2698
2699	if (pIScsiCmd)
2700	{
2701	bool final = false;
2702	PSCSIREQ pScsiReq;
2703
2704	LogFlow(("Found SCSI command %#p for Itt=%#u\n", pIScsiCmd, paResBHS[4]));
2705
2706	Assert(pIScsiCmd->enmCmdType == ISCSICMDTYPE_REQ);
2707	pScsiReq = pIScsiCmd->CmdType.ScsiReq.pScsiReq;
2708
2709	final = !!(RT_N2H_U32(paResBHS[0]) & ISCSI_FINAL_BIT);
2710	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(paResBHS[0]) & ISCSIOP_MASK);
2711	if (cmd == ISCSIOP_SCSI_RES)
2712	{
2713	/* This is the final PDU which delivers the status (and may be omitted if
2714	* the last Data-In PDU included successful completion status). Note
2715	* that ExpStatSN has been bumped already in iscsiRecvPDU. */
2716	if (!final \|\| ((RT_N2H_U32(paResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(paResBHS[6]) != pImage->ExpStatSN - 1))
2717	{
2718	/* SCSI Response in the wrong place or with a (target) failure. */
2719	LogFlow(("Wrong ExpStatSN value in PDU\n"));
2720	rc = VERR_PARSE_ERROR;
2721	}
2722	else
2723	{
2724	pScsiReq->status = RT_N2H_U32(paResBHS[0]) & 0x000000ff;
2725	size_t cbData = RT_N2H_U32(paResBHS[1]) & 0x00ffffff;
2726	void pvSense = (uint8_t )paRes[0].pvSeg + ISCSI_BHS_SIZE;
2727
2728	if (cbData >= 2)
2729	{
2730	uint32_t cbStat = RT_N2H_U32(((uint32_t *)pvSense)[0]) >> 16;
2731	if (cbStat + 2 > cbData)
2732	{
2733	rc = VERR_BUFFER_OVERFLOW;
2734	}
2735	else
2736	{
2737	/* Truncate sense data if it doesn't fit into the buffer. */
2738	pScsiReq->cbSense = RT_MIN(cbStat, pScsiReq->cbSense);
2739	memcpy(pScsiReq->pvSense, (uint8_t *)pvSense + 2,
2740	RT_MIN(paRes[0].cbSeg - ISCSI_BHS_SIZE - 2, pScsiReq->cbSense));
2741	}
2742	}
2743	else if (cbData == 1)
2744	rc = VERR_PARSE_ERROR;
2745	else
2746	pScsiReq->cbSense = 0;
2747	}
2748	iscsiCmdComplete(pImage, pIScsiCmd, rc);
2749	}
2750	else if (cmd == ISCSIOP_SCSI_DATA_IN)
2751	{
2752	/* A Data-In PDU carries some data that needs to be added to the received
2753	* data in response to the command. There may be both partial and complete
2754	* Data-In PDUs, so collect data until the status is included or the status
2755	* is sent in a separate SCSI Result frame (see above). */
2756	size_t cbData = RT_N2H_U32(paResBHS[1]) & 0x00ffffff;
2757	void pvData = (uint8_t )paRes[0].pvSeg + ISCSI_BHS_SIZE;
2758
2759	if (final && cbData > pScsiReq->cbT2IData)
2760	{
2761	/* The received PDU is bigger than what we requested.
2762	* Must not happen under normal circumstances and is a target error. */
2763	rc = VERR_BUFFER_OVERFLOW;
2764	}
2765	else
2766	{
2767	/* Copy data from the received PDU into the T2I segments. */
2768	size_t cbCopied = RTSgBufCopyFromBuf(&pScsiReq->SgBufT2I, pvData, cbData);
2769	Assert(cbCopied == cbData);
2770
2771	if (final && (RT_N2H_U32(paResBHS[0]) & ISCSI_STATUS_BIT) != 0)
2772	{
2773	pScsiReq->status = RT_N2H_U32(paResBHS[0]) & 0x000000ff;
2774	pScsiReq->cbSense = 0;
2775	iscsiCmdComplete(pImage, pIScsiCmd, VINF_SUCCESS);
2776	}
2777	}
2778	}
2779	else
2780	rc = VERR_PARSE_ERROR;
2781	}
2782
2783	/* Log any errors here but ignore the PDU. */
2784	if (RT_FAILURE(rc))
2785	{
2786	LogRel(("iSCSI: Received malformed PDU from target %s (rc=%Rrc), ignoring\n", pImage->pszTargetName, rc));
2787	rc = VINF_SUCCESS;
2788	}
2789
2790	return rc;
2791	}
2792
2793	/**
2794	* Appends a key-value pair to the buffer. Normal ASCII strings (cbValue == 0) and large binary values
2795	* of a given length (cbValue > 0) are directly supported. Other value types must be converted to ASCII
2796	* by the caller. Strings must be in UTF-8 encoding.
2797	*
2798	* @returns VBOX status
2799	* @param pbBuf Pointer to the key-value buffer.
2800	* @param cbBuf Length of the key-value buffer.
2801	* @param pcbBufCurr Currently used portion of the key-value buffer.
2802	* @param pszKey Pointer to a string containing the key.
2803	* @param pszValue Pointer to either a string containing the value or to a large binary value.
2804	* @param cbValue Length of the binary value if applicable.
2805	*/
2806	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char *pcszKey,
2807	const char *pcszValue, size_t cbValue)
2808	{
2809	size_t cbBufTmp = *pcbBufCurr;
2810	size_t cbKey = strlen(pcszKey);
2811	size_t cbValueEnc;
2812	uint8_t *pbCurr;
2813
2814	if (cbValue == 0)
2815	cbValueEnc = strlen(pcszValue);
2816	else
2817	cbValueEnc = cbValue * 2 + 2; /* 2 hex bytes per byte, 2 bytes prefix */
2818
2819	if (cbBuf < cbBufTmp + cbKey + 1 + cbValueEnc + 1)
2820	{
2821	/* Buffer would overflow, signal error. */
2822	return VERR_BUFFER_OVERFLOW;
2823	}
2824
2825	/*
2826	* Append a key=value pair (zero terminated string) to the end of the buffer.
2827	*/
2828	pbCurr = pbBuf + cbBufTmp;
2829	memcpy(pbCurr, pcszKey, cbKey);
2830	pbCurr += cbKey;
2831	*pbCurr++ = '=';
2832	if (cbValue == 0)
2833	{
2834	memcpy(pbCurr, pcszValue, cbValueEnc);
2835	pbCurr += cbValueEnc;
2836	}
2837	else
2838	{
2839	*pbCurr++ = '0';
2840	*pbCurr++ = 'x';
2841	for (uint32_t i = 0; i < cbValue; i++)
2842	{
2843	uint8_t b;
2844	b = pcszValue[i];
2845	*pbCurr++ = NUM_2_HEX(b >> 4);
2846	*pbCurr++ = NUM_2_HEX(b & 0xf);
2847	}
2848	}
2849	*pbCurr = '\0';
2850	*pcbBufCurr = cbBufTmp + cbKey + 1 + cbValueEnc + 1;
2851
2852	return VINF_SUCCESS;
2853	}
2854
2855
2856	/**
2857	* Retrieve the value for a given key from the key=value buffer.
2858	*
2859	* @returns VBOX status.
2860	* @param pbBuf Buffer containing key=value pairs.
2861	* @param cbBuf Length of buffer with key=value pairs.
2862	* @param pszKey Pointer to key for which to retrieve the value.
2863	* @param ppszValue Pointer to value string pointer.
2864	*/
2865	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue)
2866	{
2867	size_t cbKey = strlen(pcszKey);
2868
2869	while (cbBuf != 0)
2870	{
2871	size_t cbKeyValNull = strlen((const char *)pbBuf) + 1;
2872
2873	if (strncmp(pcszKey, (const char *)pbBuf, cbKey) == 0 && pbBuf[cbKey] == '=')
2874	{
2875	ppcszValue = (const char )(pbBuf + cbKey + 1);
2876	return VINF_SUCCESS;
2877	}
2878	pbBuf += cbKeyValNull;
2879	cbBuf -= cbKeyValNull;
2880	}
2881	return VERR_INVALID_NAME;
2882	}
2883
2884
2885	/**
2886	* Convert a long-binary value from a value string to the binary representation.
2887	*
2888	* @returns VBOX status
2889	* @param pszValue Pointer to a string containing the textual value representation.
2890	* @param pbValue Pointer to the value buffer for the binary value.
2891	* @param pcbValue In: length of value buffer, out: actual length of binary value.
2892	*/
2893	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue)
2894	{
2895	size_t cbValue = *pcbValue;
2896	char c1, c2, c3, c4;
2897	Assert(cbValue >= 1);
2898
2899	if (strlen(pcszValue) < 3)
2900	return VERR_PARSE_ERROR;
2901	if (*pcszValue++ != '0')
2902	return VERR_PARSE_ERROR;
2903	switch (*pcszValue++)
2904	{
2905	case 'x':
2906	case 'X':
2907	if (strlen(pcszValue) & 1)
2908	{
2909	c1 = *pcszValue++;
2910	*pbValue++ = HEX_2_NUM(c1);
2911	cbValue--;
2912	}
2913	while (*pcszValue != '\0')
2914	{
2915	if (cbValue == 0)
2916	return VERR_BUFFER_OVERFLOW;
2917	c1 = *pcszValue++;
2918	if ((c1 < '0' \|\| c1 > '9') && (c1 < 'a' \|\| c1 > 'f') && (c1 < 'A' \|\| c1 > 'F'))
2919	return VERR_PARSE_ERROR;
2920	c2 = *pcszValue++;
2921	if ((c2 < '0' \|\| c2 > '9') && (c2 < 'a' \|\| c2 > 'f') && (c2 < 'A' \|\| c2 > 'F'))
2922	return VERR_PARSE_ERROR;
2923	*pbValue++ = (HEX_2_NUM(c1) << 4) \| HEX_2_NUM(c2);
2924	cbValue--;
2925	}
2926	*pcbValue -= cbValue;
2927	break;
2928	case 'b':
2929	case 'B':
2930	if ((strlen(pcszValue) & 3) != 0)
2931	return VERR_PARSE_ERROR;
2932	while (*pcszValue != '\0')
2933	{
2934	uint32_t temp;
2935	if (cbValue == 0)
2936	return VERR_BUFFER_OVERFLOW;
2937	c1 = *pcszValue++;
2938	if ((c1 < 'A' \|\| c1 > 'Z') && (c1 < 'a' \|\| c1 >'z') && (c1 < '0' \|\| c1 > '9') && (c1 != '+') && (c1 != '/'))
2939	return VERR_PARSE_ERROR;
2940	c2 = *pcszValue++;
2941	if ((c2 < 'A' \|\| c2 > 'Z') && (c2 < 'a' \|\| c2 >'z') && (c2 < '0' \|\| c2 > '9') && (c2 != '+') && (c2 != '/'))
2942	return VERR_PARSE_ERROR;
2943	c3 = *pcszValue++;
2944	if ((c3 < 'A' \|\| c3 > 'Z') && (c3 < 'a' \|\| c3 >'z') && (c3 < '0' \|\| c3 > '9') && (c3 != '+') && (c3 != '/') && (c3 != '='))
2945	return VERR_PARSE_ERROR;
2946	c4 = *pcszValue++;
2947	if ( (c3 == '=' && c4 != '=')
2948	\|\| ((c4 < 'A' \|\| c4 > 'Z') && (c4 < 'a' \|\| c4 >'z') && (c4 < '0' \|\| c4 > '9') && (c4 != '+') && (c4 != '/') && (c4 != '=')))
2949	return VERR_PARSE_ERROR;
2950	temp = (B64_2_NUM(c1) << 18) \| (B64_2_NUM(c2) << 12);
2951	if (c3 == '=') {
2952	if (*pcszValue != '\0')
2953	return VERR_PARSE_ERROR;
2954	*pbValue++ = temp >> 16;
2955	cbValue--;
2956	} else {
2957	temp \|= B64_2_NUM(c3) << 6;
2958	if (c4 == '=') {
2959	if (*pcszValue != '\0')
2960	return VERR_PARSE_ERROR;
2961	if (cbValue < 2)
2962	return VERR_BUFFER_OVERFLOW;
2963	*pbValue++ = temp >> 16;
2964	*pbValue++ = (temp >> 8) & 0xff;
2965	cbValue -= 2;
2966	}
2967	else
2968	{
2969	temp \|= B64_2_NUM(c4);
2970	if (cbValue < 3)
2971	return VERR_BUFFER_OVERFLOW;
2972	*pbValue++ = temp >> 16;
2973	*pbValue++ = (temp >> 8) & 0xff;
2974	*pbValue++ = temp & 0xff;
2975	cbValue -= 3;
2976	}
2977	}
2978	}
2979	*pcbValue -= cbValue;
2980	break;
2981	default:
2982	return VERR_PARSE_ERROR;
2983	}
2984	return VINF_SUCCESS;
2985	}
2986
2987
2988	/**
2989	* Retrieve the relevant parameter values and update the initiator state.
2990	*
2991	* @returns VBOX status.
2992	* @param pImage Current iSCSI initiator state.
2993	* @param pbBuf Buffer containing key=value pairs.
2994	* @param cbBuf Length of buffer with key=value pairs.
2995	*/
2996	static int iscsiUpdateParameters(PISCSIIMAGE pImage, const uint8_t *pbBuf, size_t cbBuf)
2997	{
2998	int rc;
2999	const char *pcszMaxRecvDataSegmentLength = NULL;
3000	const char *pcszMaxBurstLength = NULL;
3001	const char *pcszFirstBurstLength = NULL;
3002	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "MaxRecvDataSegmentLength", &pcszMaxRecvDataSegmentLength);
3003	if (rc == VERR_INVALID_NAME)
3004	rc = VINF_SUCCESS;
3005	if (RT_FAILURE(rc))
3006	return VERR_PARSE_ERROR;
3007	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "MaxBurstLength", &pcszMaxBurstLength);
3008	if (rc == VERR_INVALID_NAME)
3009	rc = VINF_SUCCESS;
3010	if (RT_FAILURE(rc))
3011	return VERR_PARSE_ERROR;
3012	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "FirstBurstLength", &pcszFirstBurstLength);
3013	if (rc == VERR_INVALID_NAME)
3014	rc = VINF_SUCCESS;
3015	if (RT_FAILURE(rc))
3016	return VERR_PARSE_ERROR;
3017	if (pcszMaxRecvDataSegmentLength)
3018	{
3019	uint32_t cb = pImage->cbSendDataLength;
3020	rc = RTStrToUInt32Full(pcszMaxRecvDataSegmentLength, 0, &cb);
3021	AssertRC(rc);
3022	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3023	}
3024	if (pcszMaxBurstLength)
3025	{
3026	uint32_t cb = pImage->cbSendDataLength;
3027	rc = RTStrToUInt32Full(pcszMaxBurstLength, 0, &cb);
3028	AssertRC(rc);
3029	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3030	}
3031	if (pcszFirstBurstLength)
3032	{
3033	uint32_t cb = pImage->cbSendDataLength;
3034	rc = RTStrToUInt32Full(pcszFirstBurstLength, 0, &cb);
3035	AssertRC(rc);
3036	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3037	}
3038	return VINF_SUCCESS;
3039	}
3040
3041
3042	static bool serial_number_less(uint32_t s1, uint32_t s2)
3043	{
3044	return (s1 < s2 && s2 - s1 < 0x80000000) \|\| (s1 > s2 && s1 - s2 > 0x80000000);
3045	}
3046
3047	static bool serial_number_greater(uint32_t s1, uint32_t s2)
3048	{
3049	return (s1 < s2 && s2 - s1 > 0x80000000) \|\| (s1 > s2 && s1 - s2 < 0x80000000);
3050	}
3051
3052
3053	#ifdef IMPLEMENT_TARGET_AUTH
3054	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge)
3055	{
3056	uint8_t cbChallenge;
3057
3058	cbChallenge = RTrand_U8(CHAP_MD5_CHALLENGE_MIN, CHAP_MD5_CHALLENGE_MAX);
3059	RTrand_bytes(pbChallenge, cbChallenge);
3060	*pcbChallenge = cbChallenge;
3061	}
3062	#endif
3063
3064
3065	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
3066	const uint8_t *pbSecret, size_t cbSecret)
3067	{
3068	RTMD5CONTEXT ctx;
3069	uint8_t bId;
3070
3071	bId = id;
3072	RTMd5Init(&ctx);
3073	RTMd5Update(&ctx, &bId, 1);
3074	RTMd5Update(&ctx, pbSecret, cbSecret);
3075	RTMd5Update(&ctx, pbChallenge, cbChallenge);
3076	RTMd5Final(pbResponse, &ctx);
3077	}
3078
3079	/**
3080	* Internal. - Wrapper around the extended select callback of the net interface.
3081	*/
3082	DECLINLINE(int) iscsiIoThreadWait(PISCSIIMAGE pImage, RTMSINTERVAL cMillies, uint32_t fEvents, uint32_t *pfEvents)
3083	{
3084	return pImage->pIfNet->pfnSelectOneEx(pImage->Socket, fEvents, pfEvents, cMillies);
3085	}
3086
3087	/**
3088	* Internal. - Pokes a thread waiting for I/O.
3089	*/
3090	DECLINLINE(int) iscsiIoThreadPoke(PISCSIIMAGE pImage)
3091	{
3092	return pImage->pIfNet->pfnPoke(pImage->Socket);
3093	}
3094
3095	/**
3096	* Internal. - Get the next request from the queue.
3097	*/
3098	DECLINLINE(PISCSICMD) iscsiCmdGet(PISCSIIMAGE pImage)
3099	{
3100	int rc;
3101	PISCSICMD pIScsiCmd = NULL;
3102
3103	rc = RTSemMutexRequest(pImage->MutexReqQueue, RT_INDEFINITE_WAIT);
3104	AssertRC(rc);
3105
3106	pIScsiCmd = pImage->pScsiReqQueue;
3107	if (pIScsiCmd)
3108	{
3109	pImage->pScsiReqQueue = pIScsiCmd->pNext;
3110	pIScsiCmd->pNext = NULL;
3111	}
3112
3113	rc = RTSemMutexRelease(pImage->MutexReqQueue);
3114	AssertRC(rc);
3115
3116	return pIScsiCmd;
3117	}
3118
3119
3120	/**
3121	* Internal. - Adds the given command to the queue.
3122	*/
3123	DECLINLINE(int) iscsiCmdPut(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
3124	{
3125	int rc = RTSemMutexRequest(pImage->MutexReqQueue, RT_INDEFINITE_WAIT);
3126	AssertRC(rc);
3127
3128	pIScsiCmd->pNext = pImage->pScsiReqQueue;
3129	pImage->pScsiReqQueue = pIScsiCmd;
3130
3131	rc = RTSemMutexRelease(pImage->MutexReqQueue);
3132	AssertRC(rc);
3133
3134	iscsiIoThreadPoke(pImage);
3135
3136	return rc;
3137	}
3138
3139	/**
3140	* Internal. - Completes the request with the appropriate action.
3141	* Synchronous requests are completed with waking up the thread
3142	* and asynchronous ones by continuing the associated I/O context.
3143	*/
3144	static void iscsiCmdComplete(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd, int rcCmd)
3145	{
3146	LogFlowFunc(("pImage=%#p pIScsiCmd=%#p rcCmd=%Rrc\n", pImage, pIScsiCmd, rcCmd));
3147
3148	/* Remove from the table first. */
3149	iscsiCmdRemove(pImage, pIScsiCmd->Itt);
3150
3151	/* Call completion callback. */
3152	pIScsiCmd->pfnComplete(pImage, rcCmd, pIScsiCmd->pvUser);
3153
3154	/* Free command structure. */
3155	#ifdef DEBUG
3156	memset(pIScsiCmd, 0xff, sizeof(ISCSICMD));
3157	#endif
3158	RTMemFree(pIScsiCmd);
3159	}
3160
3161	/**
3162	* Reattaches the to the target after an error aborting
3163	* pending commands and resending them.
3164	*
3165	* @param pImage iSCSI connection state.
3166	*/
3167	static void iscsiReattach(PISCSIIMAGE pImage)
3168	{
3169	int rc = VINF_SUCCESS;
3170	PISCSICMD pIScsiCmdHead = NULL;
3171	PISCSICMD pIScsiCmd = NULL;
3172	PISCSICMD pIScsiCmdCur = NULL;
3173	PISCSIPDUTX pIScsiPDUTx = NULL;
3174
3175	/* Close connection. */
3176	iscsiTransportClose(pImage);
3177	pImage->state = ISCSISTATE_FREE;
3178
3179	/* Reset PDU we are receiving. */
3180	iscsiRecvPDUReset(pImage);
3181
3182	/*
3183	* Abort all PDUs we are about to transmit,
3184	* the command need a new Itt if the relogin is successful.
3185	*/
3186	while (pImage->pIScsiPDUTxHead)
3187	{
3188	pIScsiPDUTx = pImage->pIScsiPDUTxHead;
3189	pImage->pIScsiPDUTxHead = pIScsiPDUTx->pNext;
3190
3191	pIScsiCmd = pIScsiPDUTx->pIScsiCmd;
3192
3193	if (pIScsiCmd)
3194	{
3195	/* Place on command list. */
3196	pIScsiCmd->pNext = pIScsiCmdHead;
3197	pIScsiCmdHead = pIScsiCmd;
3198	}
3199	RTMemFree(pIScsiPDUTx);
3200	}
3201
3202	/* Clear the tail pointer (safety precaution). */
3203	pImage->pIScsiPDUTxTail = NULL;
3204
3205	/* Clear the current PDU too. */
3206	if (pImage->pIScsiPDUTxCur)
3207	{
3208	pIScsiPDUTx = pImage->pIScsiPDUTxCur;
3209
3210	pImage->pIScsiPDUTxCur = NULL;
3211	pIScsiCmd = pIScsiPDUTx->pIScsiCmd;
3212
3213	if (pIScsiCmd)
3214	{
3215	pIScsiCmd->pNext = pIScsiCmdHead;
3216	pIScsiCmdHead = pIScsiCmd;
3217	}
3218	RTMemFree(pIScsiPDUTx);
3219	}
3220
3221	/*
3222	* Get all commands which are waiting for a response
3223	* They need to be resend too after a successful reconnect.
3224	*/
3225	pIScsiCmd = iscsiCmdRemoveAll(pImage);
3226
3227	if (pIScsiCmd)
3228	{
3229	pIScsiCmdCur = pIScsiCmd;
3230	while (pIScsiCmdCur->pNext)
3231	pIScsiCmdCur = pIScsiCmdCur->pNext;
3232
3233	/*
3234	* Place them in front of the list because they are the oldest requests
3235	* and need to be processed first to minimize the risk to time out.
3236	*/
3237	pIScsiCmdCur->pNext = pIScsiCmdHead;
3238	pIScsiCmdHead = pIScsiCmd;
3239	}
3240
3241	/* Try to attach. */
3242	rc = iscsiAttach(pImage);
3243	if (RT_SUCCESS(rc))
3244	{
3245	/* Phew, we have a connection again.
3246	* Prepare new PDUs for the aborted commands.
3247	*/
3248	while (pIScsiCmdHead)
3249	{
3250	pIScsiCmd = pIScsiCmdHead;
3251	pIScsiCmdHead = pIScsiCmdHead->pNext;
3252
3253	pIScsiCmd->pNext = NULL;
3254
3255	rc = iscsiPDUTxPrepare(pImage, pIScsiCmd);
3256	AssertRC(rc);
3257	}
3258	}
3259	else
3260	{
3261	/*
3262	* Still no luck, complete commands with error so the caller
3263	* has a chance to inform the user and maybe resend the command.
3264	*/
3265	while (pIScsiCmdHead)
3266	{
3267	pIScsiCmd = pIScsiCmdHead;
3268	pIScsiCmdHead = pIScsiCmdHead->pNext;
3269
3270	iscsiCmdComplete(pImage, pIScsiCmd, VERR_BROKEN_PIPE);
3271	}
3272	}
3273	}
3274
3275	/**
3276	* Internal. Main iSCSI I/O worker.
3277	*/
3278	static DECLCALLBACK(int) iscsiIoThreadWorker(RTTHREAD ThreadSelf, void *pvUser)
3279	{
3280	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
3281
3282	/* Initialize the initial event mask. */
3283	pImage->fPollEvents = VD_INTERFACETCPNET_EVT_READ \| VD_INTERFACETCPNET_EVT_ERROR;
3284
3285	while (pImage->fRunning)
3286	{
3287	uint32_t fEvents;
3288	int rc;
3289
3290	fEvents = 0;
3291
3292	/* Wait for work or for data from the target. */
3293	RTMSINTERVAL msWait;
3294
3295	if (pImage->cCmdsWaiting)
3296	{
3297	pImage->fPollEvents &= ~VD_INTERFACETCPNET_HINT_INTERRUPT;
3298	msWait = pImage->uReadTimeout;
3299	}
3300	else
3301	{
3302	pImage->fPollEvents \|= VD_INTERFACETCPNET_HINT_INTERRUPT;
3303	msWait = RT_INDEFINITE_WAIT;
3304	}
3305
3306	LogFlow(("Waiting for events fPollEvents=%#x\n", pImage->fPollEvents));
3307	rc = iscsiIoThreadWait(pImage, msWait, pImage->fPollEvents, &fEvents);
3308	if (rc == VERR_INTERRUPTED)
3309	{
3310	/* Check the queue. */
3311	PISCSICMD pIScsiCmd = iscsiCmdGet(pImage);
3312
3313	while (pIScsiCmd)
3314	{
3315	switch (pIScsiCmd->enmCmdType)
3316	{
3317	case ISCSICMDTYPE_REQ:
3318	{
3319	/* If there is no connection complete the command with an error. */
3320	if (RT_LIKELY(iscsiIsClientConnected(pImage)))
3321	{
3322	rc = iscsiPDUTxPrepare(pImage, pIScsiCmd);
3323	AssertRC(rc);
3324	}
3325	else
3326	iscsiCmdComplete(pImage, pIScsiCmd, VERR_NET_CONNECTION_REFUSED);
3327	break;
3328	}
3329	case ISCSICMDTYPE_EXEC:
3330	{
3331	rc = pIScsiCmd->CmdType.Exec.pfnExec(pIScsiCmd->CmdType.Exec.pvUser);
3332	iscsiCmdComplete(pImage, pIScsiCmd, rc);
3333	break;
3334	}
3335	default:
3336	AssertMsgFailed(("Invalid command type %d\n", pIScsiCmd->enmCmdType));
3337	}
3338
3339	pIScsiCmd = iscsiCmdGet(pImage);
3340	}
3341	}
3342	else if (rc == VERR_TIMEOUT && pImage->cCmdsWaiting)
3343	{
3344	/*
3345	* We are waiting for a response from the target but
3346	* it didn't answered yet.
3347	* We assume the connection is broken and try to reconnect.
3348	*/
3349	LogFlow(("Timed out while waiting for an answer from the target, reconnecting\n"));
3350	iscsiReattach(pImage);
3351	}
3352	else if (RT_SUCCESS(rc) \|\| rc == VERR_TIMEOUT)
3353	{
3354	Assert(pImage->state == ISCSISTATE_NORMAL);
3355	LogFlow(("Got socket events %#x\n", fEvents));
3356
3357	if (fEvents & VD_INTERFACETCPNET_EVT_READ)
3358	{
3359	/* Continue or start a new PDU receive task */
3360	LogFlow(("There is data on the socket\n"));
3361	rc = iscsiRecvPDUAsync(pImage);
3362	if (rc == VERR_BROKEN_PIPE)
3363	iscsiReattach(pImage);
3364	else if (RT_FAILURE(rc))
3365	iscsiLogRel(pImage, "iSCSI: Handling incoming request failed %Rrc\n", rc);
3366	}
3367
3368	if (fEvents & VD_INTERFACETCPNET_EVT_WRITE)
3369	{
3370	LogFlow(("The socket is writable\n"));
3371	rc = iscsiSendPDUAsync(pImage);
3372	if (RT_FAILURE(rc))
3373	{
3374	/*
3375	* Something unexpected happened, log the error and try to reset everything
3376	* by reattaching to the target.
3377	*/
3378	iscsiLogRel(pImage, "iSCSI: Sending PDU failed %Rrc\n", rc);
3379	iscsiReattach(pImage);
3380	}
3381	}
3382
3383	if (fEvents & VD_INTERFACETCPNET_EVT_ERROR)
3384	{
3385	LogFlow(("An error ocurred\n"));
3386	iscsiReattach(pImage);
3387	}
3388	}
3389	else
3390	iscsiLogRel(pImage, "iSCSI: Waiting for I/O failed rc=%Rrc\n", rc);
3391	}
3392
3393	return VINF_SUCCESS;
3394	}
3395
3396	/**
3397	* Internal. - Enqueues a request asynchronously.
3398	*/
3399	static int iscsiCommandAsync(PISCSIIMAGE pImage, PSCSIREQ pScsiReq,
3400	PFNISCSICMDCOMPLETED pfnComplete, void *pvUser)
3401	{
3402	int rc;
3403
3404	if (pImage->fExtendedSelectSupported)
3405	{
3406	PISCSICMD pIScsiCmd = (PISCSICMD)RTMemAllocZ(sizeof(ISCSICMD));
3407	if (!pIScsiCmd)
3408	return VERR_NO_MEMORY;
3409
3410	/* Init the command structure. */
3411	pIScsiCmd->pNext = NULL;
3412	pIScsiCmd->enmCmdType = ISCSICMDTYPE_REQ;
3413	pIScsiCmd->pfnComplete = pfnComplete;
3414	pIScsiCmd->pvUser = pvUser;
3415	pIScsiCmd->CmdType.ScsiReq.pScsiReq = pScsiReq;
3416
3417	rc = iscsiCmdPut(pImage, pIScsiCmd);
3418	if (RT_FAILURE(rc))
3419	RTMemFree(pIScsiCmd);
3420	}
3421	else
3422	rc = VERR_NOT_SUPPORTED;
3423
3424	return rc;
3425	}
3426
3427	static void iscsiCommandCompleteSync(PISCSIIMAGE pImage, int rcReq, void *pvUser)
3428	{
3429	PISCSICMDSYNC pIScsiCmdSync = (PISCSICMDSYNC)pvUser;
3430
3431	pIScsiCmdSync->rcCmd = rcReq;
3432	int rc = RTSemEventSignal(pIScsiCmdSync->EventSem);
3433	AssertRC(rc);
3434	}
3435
3436	/**
3437	* Internal. - Enqueues a request in a synchronous fashion
3438	* i.e. returns when the request completed.
3439	*/
3440	static int iscsiCommandSync(PISCSIIMAGE pImage, PSCSIREQ pScsiReq, bool fRetry, int rcSense)
3441	{
3442	int rc;
3443
3444	if (pImage->fExtendedSelectSupported)
3445	{
3446	ISCSICMDSYNC IScsiCmdSync;
3447
3448	/* Create event semaphore. */
3449	rc = RTSemEventCreate(&IScsiCmdSync.EventSem);
3450	if (RT_FAILURE(rc))
3451	return rc;
3452
3453	if (fRetry)
3454	{
3455	for (unsigned i = 0; i < 10; i++)
3456	{
3457	rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandCompleteSync, &IScsiCmdSync);
3458	if (RT_FAILURE(rc))
3459	break;
3460
3461	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3462	AssertRC(rc);
3463	rc = IScsiCmdSync.rcCmd;
3464
3465	if ( (RT_SUCCESS(rc) && !pScsiReq->cbSense)
3466	\|\| RT_FAILURE(rc))
3467	break;
3468	rc = rcSense;
3469	}
3470	}
3471	else
3472	{
3473	rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandCompleteSync, &IScsiCmdSync);
3474	if (RT_SUCCESS(rc))
3475	{
3476	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3477	AssertRC(rc);
3478	rc = IScsiCmdSync.rcCmd;
3479
3480	if (RT_FAILURE(rc) \|\| pScsiReq->cbSense > 0)
3481	rc = rcSense;
3482	}
3483	}
3484
3485	RTSemEventDestroy(IScsiCmdSync.EventSem);
3486	}
3487	else
3488	{
3489	if (fRetry)
3490	{
3491	for (unsigned i = 0; i < 10; i++)
3492	{
3493	rc = iscsiCommand(pImage, pScsiReq);
3494	if ( (RT_SUCCESS(rc) && !pScsiReq->cbSense)
3495	\|\| RT_FAILURE(rc))
3496	break;
3497	rc = rcSense;
3498	}
3499	}
3500	else
3501	{
3502	rc = iscsiCommand(pImage, pScsiReq);
3503	if (RT_SUCCESS(rc) && pScsiReq->cbSense > 0)
3504	rc = rcSense;
3505	}
3506	}
3507
3508	return rc;
3509	}
3510
3511
3512	/**
3513	* Internal. - Executes a given function in a synchronous fashion
3514	* on the I/O thread if available.
3515	*/
3516	static int iscsiExecSync(PISCSIIMAGE pImage, PFNISCSIEXEC pfnExec, void *pvUser)
3517	{
3518	int rc;
3519
3520	if (pImage->fExtendedSelectSupported)
3521	{
3522	ISCSICMDSYNC IScsiCmdSync;
3523	PISCSICMD pIScsiCmd = (PISCSICMD)RTMemAllocZ(sizeof(ISCSICMD));
3524	if (!pIScsiCmd)
3525	return VERR_NO_MEMORY;
3526
3527	/* Create event semaphore. */
3528	rc = RTSemEventCreate(&IScsiCmdSync.EventSem);
3529	if (RT_FAILURE(rc))
3530	{
3531	RTMemFree(pIScsiCmd);
3532	return rc;
3533	}
3534
3535	/* Init the command structure. */
3536	pIScsiCmd->pNext = NULL;
3537	pIScsiCmd->enmCmdType = ISCSICMDTYPE_EXEC;
3538	pIScsiCmd->pfnComplete = iscsiCommandCompleteSync;
3539	pIScsiCmd->pvUser = &IScsiCmdSync;
3540	pIScsiCmd->CmdType.Exec.pfnExec = pfnExec;
3541	pIScsiCmd->CmdType.Exec.pvUser = pvUser;
3542
3543	rc = iscsiCmdPut(pImage, pIScsiCmd);
3544	if (RT_FAILURE(rc))
3545	RTMemFree(pIScsiCmd);
3546	else
3547	{
3548	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3549	AssertRC(rc);
3550	rc = IScsiCmdSync.rcCmd;
3551	}
3552
3553	RTSemEventDestroy(IScsiCmdSync.EventSem);
3554	}
3555	else
3556	{
3557	/* No I/O thread, execute in the current thread. */
3558	rc = pfnExec(pvUser);
3559	}
3560
3561	return rc;
3562	}
3563
3564
3565	static void iscsiCommandAsyncComplete(PISCSIIMAGE pImage, int rcReq, void *pvUser)
3566	{
3567	bool fComplete = true;
3568	size_t cbTransfered = 0;
3569	PSCSIREQASYNC pReqAsync = (PSCSIREQASYNC)pvUser;
3570	PSCSIREQ pScsiReq = pReqAsync->pScsiReq;
3571
3572	if ( RT_SUCCESS(rcReq)
3573	&& pScsiReq->cbSense > 0)
3574	{
3575	/* Try again if possible. */
3576	if (pReqAsync->cSenseRetries > 0)
3577	{
3578	pReqAsync->cSenseRetries--;
3579	pScsiReq->cbSense = sizeof(pReqAsync->abSense);
3580	int rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandAsyncComplete, pReqAsync);
3581	if (RT_SUCCESS(rc))
3582	fComplete = false;
3583	else
3584	rcReq = pReqAsync->rcSense;
3585	}
3586	else
3587	rcReq = pReqAsync->rcSense;
3588	}
3589
3590	if (fComplete)
3591	{
3592	if (pScsiReq->enmXfer == SCSIXFER_FROM_TARGET)
3593	cbTransfered = pScsiReq->cbT2IData;
3594	else if (pScsiReq->enmXfer == SCSIXFER_TO_TARGET)
3595	cbTransfered = pScsiReq->cbI2TData;
3596	else
3597	AssertMsg(pScsiReq->enmXfer == SCSIXFER_NONE, ("To/From transfers are not supported yet\n"));
3598
3599	/* Continue I/O context. */
3600	pImage->pIfIo->pfnIoCtxCompleted(pImage->pIfIo->Core.pvUser,
3601	pReqAsync->pIoCtx, rcReq,
3602	cbTransfered);
3603
3604	RTMemFree(pScsiReq);
3605	RTMemFree(pReqAsync);
3606	}
3607	}
3608
3609
3610	/**
3611	* Internal. Free all allocated space for representing an image, and optionally
3612	* delete the image from disk.
3613	*/
3614	static int iscsiFreeImage(PISCSIIMAGE pImage, bool fDelete)
3615	{
3616	int rc = VINF_SUCCESS;
3617	Assert(!fDelete); /* This MUST be false, the flag isn't supported. */
3618
3619	/* Freeing a never allocated image (e.g. because the open failed) is
3620	* not signalled as an error. After all nothing bad happens. */
3621	if (pImage)
3622	{
3623	if (pImage->Mutex != NIL_RTSEMMUTEX)
3624	{
3625	/* Detaching only makes sense when the mutex is there. Otherwise the
3626	* failure happened long before we could attach to the target. */
3627	iscsiExecSync(pImage, iscsiDetach, pImage);
3628	RTSemMutexDestroy(pImage->Mutex);
3629	pImage->Mutex = NIL_RTSEMMUTEX;
3630	}
3631	if (pImage->hThreadIo != NIL_RTTHREAD)
3632	{
3633	ASMAtomicXchgBool(&pImage->fRunning, false);
3634	rc = iscsiIoThreadPoke(pImage);
3635	AssertRC(rc);
3636
3637	/* Wait for the thread to terminate. */
3638	rc = RTThreadWait(pImage->hThreadIo, RT_INDEFINITE_WAIT, NULL);
3639	AssertRC(rc);
3640	}
3641	/* Destroy the socket. */
3642	if (pImage->Socket != NIL_VDSOCKET)
3643	{
3644	pImage->pIfNet->pfnSocketDestroy(pImage->Socket);
3645	}
3646	if (pImage->MutexReqQueue != NIL_RTSEMMUTEX)
3647	{
3648	RTSemMutexDestroy(pImage->MutexReqQueue);
3649	pImage->MutexReqQueue = NIL_RTSEMMUTEX;
3650	}
3651	if (pImage->pszTargetName)
3652	{
3653	RTMemFree(pImage->pszTargetName);
3654	pImage->pszTargetName = NULL;
3655	}
3656	if (pImage->pszInitiatorName)
3657	{
3658	if (pImage->fAutomaticInitiatorName)
3659	RTStrFree(pImage->pszInitiatorName);
3660	else
3661	RTMemFree(pImage->pszInitiatorName);
3662	pImage->pszInitiatorName = NULL;
3663	}
3664	if (pImage->pszInitiatorUsername)
3665	{
3666	RTMemFree(pImage->pszInitiatorUsername);
3667	pImage->pszInitiatorUsername = NULL;
3668	}
3669	if (pImage->pbInitiatorSecret)
3670	{
3671	RTMemFree(pImage->pbInitiatorSecret);
3672	pImage->pbInitiatorSecret = NULL;
3673	}
3674	if (pImage->pszTargetUsername)
3675	{
3676	RTMemFree(pImage->pszTargetUsername);
3677	pImage->pszTargetUsername = NULL;
3678	}
3679	if (pImage->pbTargetSecret)
3680	{
3681	RTMemFree(pImage->pbTargetSecret);
3682	pImage->pbTargetSecret = NULL;
3683	}
3684	if (pImage->pvRecvPDUBuf)
3685	{
3686	RTMemFree(pImage->pvRecvPDUBuf);
3687	pImage->pvRecvPDUBuf = NULL;
3688	}
3689
3690	pImage->cbRecvPDUResidual = 0;
3691	}
3692
3693	LogFlowFunc(("returns %Rrc\n", rc));
3694	return rc;
3695	}
3696
3697	/**
3698	* Internal: Open an image, constructing all necessary data structures.
3699	*/
3700	static int iscsiOpenImage(PISCSIIMAGE pImage, unsigned uOpenFlags)
3701	{
3702	int rc;
3703	char pszLUN = NULL, pszLUNInitial = NULL;
3704	bool fLunEncoded = false;
3705	uint32_t uWriteSplitDef = 0;
3706	uint32_t uTimeoutDef = 0;
3707	uint64_t uHostIPTmp = 0;
3708	bool fHostIPDef = 0;
3709	rc = RTStrToUInt32Full(s_iscsiConfigDefaultWriteSplit, 0, &uWriteSplitDef);
3710	AssertRC(rc);
3711	rc = RTStrToUInt32Full(s_iscsiConfigDefaultTimeout, 0, &uTimeoutDef);
3712	AssertRC(rc);
3713	rc = RTStrToUInt64Full(s_iscsiConfigDefaultHostIPStack, 0, &uHostIPTmp);
3714	AssertRC(rc);
3715	fHostIPDef = !!uHostIPTmp;
3716
3717	pImage->uOpenFlags = uOpenFlags;
3718
3719	/* Get error signalling interface. */
3720	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
3721
3722	/* Get TCP network stack interface. */
3723	pImage->pIfNet = VDIfTcpNetGet(pImage->pVDIfsImage);
3724	if (!pImage->pIfNet)
3725	{
3726	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_UNKNOWN_INTERFACE,
3727	RT_SRC_POS, N_("iSCSI: TCP network stack interface missing"));
3728	goto out;
3729	}
3730
3731	/* Get configuration interface. */
3732	pImage->pIfConfig = VDIfConfigGet(pImage->pVDIfsImage);
3733	if (!pImage->pIfConfig)
3734	{
3735	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_UNKNOWN_INTERFACE,
3736	RT_SRC_POS, N_("iSCSI: configuration interface missing"));
3737	goto out;
3738	}
3739
3740	/* Get I/O interface. */
3741	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
3742	if (!pImage->pIfIo)
3743	{
3744	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_UNKNOWN_INTERFACE,
3745	RT_SRC_POS, N_("iSCSI: I/O interface missing"));
3746	goto out;
3747	}
3748
3749	/* This ISID will be adjusted later to make it unique on this host. */
3750	pImage->ISID = 0x800000000000ULL \| 0x001234560000ULL;
3751	pImage->cISCSIRetries = 10;
3752	pImage->state = ISCSISTATE_FREE;
3753	pImage->pvRecvPDUBuf = RTMemAlloc(ISCSI_RECV_PDU_BUFFER_SIZE);
3754	pImage->cbRecvPDUBuf = ISCSI_RECV_PDU_BUFFER_SIZE;
3755	if (pImage->pvRecvPDUBuf == NULL)
3756	{
3757	rc = VERR_NO_MEMORY;
3758	goto out;
3759	}
3760	pImage->Mutex = NIL_RTSEMMUTEX;
3761	pImage->MutexReqQueue = NIL_RTSEMMUTEX;
3762	rc = RTSemMutexCreate(&pImage->Mutex);
3763	if (RT_FAILURE(rc))
3764	goto out;
3765
3766	rc = RTSemMutexCreate(&pImage->MutexReqQueue);
3767	if (RT_FAILURE(rc))
3768	goto out;
3769
3770	/* Validate configuration, detect unknown keys. */
3771	if (!VDCFGAreKeysValid(pImage->pIfConfig,
3772	"TargetName\0InitiatorName\0LUN\0TargetAddress\0InitiatorUsername\0InitiatorSecret\0TargetUsername\0TargetSecret\0WriteSplit\0Timeout\0HostIPStack\0"))
3773	{
3774	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_UNKNOWN_CFG_VALUES, RT_SRC_POS, N_("iSCSI: configuration error: unknown configuration keys present"));
3775	goto out;
3776	}
3777
3778	/* Query the iSCSI upper level configuration. */
3779	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3780	"TargetName", &pImage->pszTargetName);
3781	if (RT_FAILURE(rc))
3782	{
3783	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetName as string"));
3784	goto out;
3785	}
3786	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3787	"InitiatorName", &pImage->pszInitiatorName);
3788	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3789	{
3790	pImage->fAutomaticInitiatorName = true;
3791	rc = VINF_SUCCESS;
3792	}
3793	if (RT_FAILURE(rc))
3794	{
3795	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorName as string"));
3796	goto out;
3797	}
3798	rc = VDCFGQueryStringAllocDef(pImage->pIfConfig,
3799	"LUN", &pszLUN, s_iscsiConfigDefaultLUN);
3800	if (RT_FAILURE(rc))
3801	{
3802	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read LUN as string"));
3803	goto out;
3804	}
3805	pszLUNInitial = pszLUN;
3806	if (!strncmp(pszLUN, "enc", 3))
3807	{
3808	fLunEncoded = true;
3809	pszLUN += 3;
3810	}
3811	rc = RTStrToUInt64Full(pszLUN, 0, &pImage->LUN);
3812	if (RT_FAILURE(rc))
3813	{
3814	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to convert LUN to integer"));
3815	goto out;
3816	}
3817	if (!fLunEncoded)
3818	{
3819	if (pImage->LUN <= 255)
3820	{
3821	pImage->LUN = pImage->LUN << 48; /* uses peripheral device addressing method */
3822	}
3823	else if (pImage->LUN <= 16383)
3824	{
3825	pImage->LUN = (pImage->LUN << 48) \| RT_BIT_64(62); /* uses flat space addressing method */
3826	}
3827	else
3828	{
3829	rc = VERR_OUT_OF_RANGE;
3830	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: LUN number out of range (0-16383)"));
3831	goto out;
3832	}
3833	}
3834	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3835	"TargetAddress", &pImage->pszTargetAddress);
3836	if (RT_FAILURE(rc))
3837	{
3838	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetAddress as string"));
3839	goto out;
3840	}
3841	pImage->pszInitiatorUsername = NULL;
3842	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3843	"InitiatorUsername",
3844	&pImage->pszInitiatorUsername);
3845	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3846	rc = VINF_SUCCESS;
3847	if (RT_FAILURE(rc))
3848	{
3849	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorUsername as string"));
3850	goto out;
3851	}
3852	pImage->pbInitiatorSecret = NULL;
3853	pImage->cbInitiatorSecret = 0;
3854	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig,
3855	"InitiatorSecret",
3856	(void **)&pImage->pbInitiatorSecret,
3857	&pImage->cbInitiatorSecret);
3858	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3859	rc = VINF_SUCCESS;
3860	if (RT_FAILURE(rc))
3861	{
3862	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorSecret as byte string"));
3863	goto out;
3864	}
3865	pImage->pszTargetUsername = NULL;
3866	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3867	"TargetUsername",
3868	&pImage->pszTargetUsername);
3869	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3870	rc = VINF_SUCCESS;
3871	if (RT_FAILURE(rc))
3872	{
3873	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetUsername as string"));
3874	goto out;
3875	}
3876	pImage->pbTargetSecret = NULL;
3877	pImage->cbTargetSecret = 0;
3878	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig,
3879	"TargetSecret", (void **)&pImage->pbTargetSecret,
3880	&pImage->cbTargetSecret);
3881	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3882	rc = VINF_SUCCESS;
3883	if (RT_FAILURE(rc))
3884	{
3885	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetSecret as byte string"));
3886	goto out;
3887	}
3888	rc = VDCFGQueryU32Def(pImage->pIfConfig,
3889	"WriteSplit", &pImage->cbWriteSplit,
3890	uWriteSplitDef);
3891	if (RT_FAILURE(rc))
3892	{
3893	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read WriteSplit as U32"));
3894	goto out;
3895	}
3896
3897	pImage->pszHostname = NULL;
3898	pImage->uPort = 0;
3899	pImage->Socket = NIL_VDSOCKET;
3900	/* Query the iSCSI lower level configuration. */
3901	rc = VDCFGQueryU32Def(pImage->pIfConfig,
3902	"Timeout", &pImage->uReadTimeout,
3903	uTimeoutDef);
3904	if (RT_FAILURE(rc))
3905	{
3906	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read Timeout as U32"));
3907	goto out;
3908	}
3909	rc = VDCFGQueryBoolDef(pImage->pIfConfig,
3910	"HostIPStack", &pImage->fHostIP,
3911	fHostIPDef);
3912	if (RT_FAILURE(rc))
3913	{
3914	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read HostIPStack as boolean"));
3915	goto out;
3916	}
3917
3918	/* Don't actually establish iSCSI transport connection if this is just an
3919	* open to query the image information and the host IP stack isn't used.
3920	* Even trying is rather useless, as in this context the InTnet IP stack
3921	* isn't present. Returning dummies is the best possible result anyway. */
3922	if ((uOpenFlags & VD_OPEN_FLAGS_INFO) && !pImage->fHostIP)
3923	{
3924	LogFunc(("Not opening the transport connection as IntNet IP stack is not available. Will return dummies\n"));
3925	goto out;
3926	}
3927
3928	memset(pImage->aCmdsWaiting, 0, sizeof(pImage->aCmdsWaiting));
3929	pImage->cbRecvPDUResidual = 0;
3930
3931	/* Create the socket structure. */
3932	rc = pImage->pIfNet->pfnSocketCreate(VD_INTERFACETCPNET_CONNECT_EXTENDED_SELECT,
3933	&pImage->Socket);
3934	if (RT_SUCCESS(rc))
3935	{
3936	pImage->fExtendedSelectSupported = true;
3937	pImage->fRunning = true;
3938	rc = RTThreadCreate(&pImage->hThreadIo, iscsiIoThreadWorker, pImage, 0,
3939	RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "iSCSI-Io");
3940	if (RT_FAILURE(rc))
3941	{
3942	LogFunc(("Creating iSCSI I/O thread failed rc=%Rrc\n", rc));
3943	goto out;
3944	}
3945	}
3946	else if (rc == VERR_NOT_SUPPORTED)
3947	{
3948	/* Async I/O is not supported without extended select. */
3949	if ((uOpenFlags & VD_OPEN_FLAGS_ASYNC_IO))
3950	{
3951	LogFunc(("Extended select is not supported by the interface but async I/O is requested -> %Rrc\n", rc));
3952	goto out;
3953	}
3954	else
3955	{
3956	pImage->fExtendedSelectSupported = false;
3957	rc = pImage->pIfNet->pfnSocketCreate(0, &pImage->Socket);
3958	if (RT_FAILURE(rc))
3959	{
3960	LogFunc(("Creating socket failed -> %Rrc\n", rc));
3961	goto out;
3962	}
3963	}
3964	}
3965	else
3966	{
3967	LogFunc(("Creating socket failed -> %Rrc\n", rc));
3968	goto out;
3969	}
3970
3971	/*
3972	* Attach to the iSCSI target. This implicitly establishes the iSCSI
3973	* transport connection.
3974	*/
3975	rc = iscsiExecSync(pImage, iscsiAttach, pImage);
3976	if (RT_FAILURE(rc))
3977	{
3978	LogRel(("iSCSI: could not open target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
3979	goto out;
3980	}
3981	LogFlowFunc(("target '%s' opened successfully\n", pImage->pszTargetName));
3982
3983	SCSIREQ sr;
3984	RTSGSEG DataSeg;
3985	uint8_t sense[96];
3986	uint8_t data8[8];
3987	uint8_t data12[12];
3988
3989	/*
3990	* Inquire available LUNs - purely dummy request.
3991	*/
3992	uint8_t CDB_rlun[12];
3993	uint8_t rlundata[16];
3994	CDB_rlun[0] = SCSI_REPORT_LUNS;
3995	CDB_rlun[1] = 0; /* reserved */
3996	CDB_rlun[2] = 0; /* reserved */
3997	CDB_rlun[3] = 0; /* reserved */
3998	CDB_rlun[4] = 0; /* reserved */
3999	CDB_rlun[5] = 0; /* reserved */
4000	CDB_rlun[6] = sizeof(rlundata) >> 24;
4001	CDB_rlun[7] = (sizeof(rlundata) >> 16) & 0xff;
4002	CDB_rlun[8] = (sizeof(rlundata) >> 8) & 0xff;
4003	CDB_rlun[9] = sizeof(rlundata) & 0xff;
4004	CDB_rlun[10] = 0; /* reserved */
4005	CDB_rlun[11] = 0; /* control */
4006
4007	DataSeg.pvSeg = rlundata;
4008	DataSeg.cbSeg = sizeof(rlundata);
4009
4010	sr.enmXfer = SCSIXFER_FROM_TARGET;
4011	sr.cbCDB = sizeof(CDB_rlun);
4012	sr.pvCDB = CDB_rlun;
4013	sr.cbI2TData = 0;
4014	sr.paI2TSegs = NULL;
4015	sr.cI2TSegs = 0;
4016	sr.cbT2IData = DataSeg.cbSeg;
4017	sr.paT2ISegs = &DataSeg;
4018	sr.cT2ISegs = 1;
4019	sr.cbSense = sizeof(sense);
4020	sr.pvSense = sense;
4021
4022	rc = iscsiCommandSync(pImage, &sr, false, VERR_INVALID_STATE);
4023	if (RT_FAILURE(rc))
4024	{
4025	LogRel(("iSCSI: Could not get LUN info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4026	return rc;
4027	}
4028
4029	/*
4030	* Inquire device characteristics - no tapes, scanners etc., please.
4031	*/
4032	uint8_t CDB_inq[6];
4033	CDB_inq[0] = SCSI_INQUIRY;
4034	CDB_inq[1] = 0; /* reserved */
4035	CDB_inq[2] = 0; /* reserved */
4036	CDB_inq[3] = 0; /* reserved */
4037	CDB_inq[4] = sizeof(data8);
4038	CDB_inq[5] = 0; /* control */
4039
4040	DataSeg.pvSeg = data8;
4041	DataSeg.cbSeg = sizeof(data8);
4042
4043	sr.enmXfer = SCSIXFER_FROM_TARGET;
4044	sr.cbCDB = sizeof(CDB_inq);
4045	sr.pvCDB = CDB_inq;
4046	sr.cbI2TData = 0;
4047	sr.paI2TSegs = NULL;
4048	sr.cI2TSegs = 0;
4049	sr.cbT2IData = DataSeg.cbSeg;
4050	sr.paT2ISegs = &DataSeg;
4051	sr.cT2ISegs = 1;
4052	sr.cbSense = sizeof(sense);
4053	sr.pvSense = sense;
4054
4055	rc = iscsiCommandSync(pImage, &sr, true /* fRetry */, VERR_INVALID_STATE);
4056	if (RT_SUCCESS(rc))
4057	{
4058	uint8_t devType = (sr.cbT2IData > 0) ? data8[0] & SCSI_DEVTYPE_MASK : 255;
4059	if (devType != SCSI_DEVTYPE_DISK)
4060	{
4061	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4062	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports device type=%u"),
4063	pImage->pszTargetAddress, pImage->pszTargetName,
4064	pImage->LUN, devType);
4065	LogRel(("iSCSI: Unsupported SCSI peripheral device type %d for target %s\n", devType & SCSI_DEVTYPE_MASK, pImage->pszTargetName));
4066	goto out;
4067	}
4068	uint8_t uCmdQueue = (sr.cbT2IData >= 8) ? data8[7] & SCSI_INQUIRY_CMDQUE_MASK : 0;
4069	if (uCmdQueue > 0)
4070	pImage->fCmdQueuingSupported = true;
4071	else if (uOpenFlags & VD_OPEN_FLAGS_ASYNC_IO)
4072	{
4073	rc = VERR_NOT_SUPPORTED;
4074	goto out;
4075	}
4076
4077	LogRel(("iSCSI: target address %s, target name %s, %s command queuing\n",
4078	pImage->pszTargetAddress, pImage->pszTargetName,
4079	pImage->fCmdQueuingSupported ? "supports" : "doesn't support"));
4080	}
4081	else
4082	{
4083	LogRel(("iSCSI: Could not get INQUIRY info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4084	goto out;
4085	}
4086
4087	/*
4088	* Query write disable bit in the device specific parameter entry in the
4089	* mode parameter header. Refuse read/write opening of read only disks.
4090	*/
4091
4092	uint8_t CDB_ms[6];
4093	uint8_t data4[4];
4094	CDB_ms[0] = SCSI_MODE_SENSE_6;
4095	CDB_ms[1] = 0; /* dbd=0/reserved */
4096	CDB_ms[2] = 0x3f; /* pc=0/page code=0x3f, ask for all pages */
4097	CDB_ms[3] = 0; /* subpage code=0, return everything in page_0 format */
4098	CDB_ms[4] = sizeof(data4); /* allocation length=4 */
4099	CDB_ms[5] = 0; /* control */
4100
4101	DataSeg.pvSeg = data4;
4102	DataSeg.cbSeg = sizeof(data4);
4103
4104	sr.enmXfer = SCSIXFER_FROM_TARGET;
4105	sr.cbCDB = sizeof(CDB_ms);
4106	sr.pvCDB = CDB_ms;
4107	sr.cbI2TData = 0;
4108	sr.paI2TSegs = NULL;
4109	sr.cI2TSegs = 0;
4110	sr.cbT2IData = DataSeg.cbSeg;
4111	sr.paT2ISegs = &DataSeg;
4112	sr.cT2ISegs = 1;
4113	sr.cbSense = sizeof(sense);
4114	sr.pvSense = sense;
4115
4116	rc = iscsiCommandSync(pImage, &sr, true /* fRetry */, VERR_INVALID_STATE);
4117	if (RT_SUCCESS(rc))
4118	{
4119	if (!(uOpenFlags & VD_OPEN_FLAGS_READONLY) && data4[2] & 0x80)
4120	{
4121	rc = VERR_VD_IMAGE_READ_ONLY;
4122	goto out;
4123	}
4124	}
4125	else
4126	{
4127	LogRel(("iSCSI: Could not get MODE SENSE info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4128	goto out;
4129	}
4130
4131	/*
4132	* Determine sector size and capacity of the volume immediately.
4133	*/
4134	uint8_t CDB_cap[16];
4135
4136	RT_ZERO(data12);
4137	RT_ZERO(CDB_cap);
4138	CDB_cap[0] = SCSI_SERVICE_ACTION_IN_16;
4139	CDB_cap[1] = SCSI_SVC_ACTION_IN_READ_CAPACITY_16; /* subcommand */
4140	CDB_cap[10+3] = sizeof(data12); /* allocation length (dword) */
4141
4142	DataSeg.pvSeg = data12;
4143	DataSeg.cbSeg = sizeof(data12);
4144
4145	sr.enmXfer = SCSIXFER_FROM_TARGET;
4146	sr.cbCDB = sizeof(CDB_cap);
4147	sr.pvCDB = CDB_cap;
4148	sr.cbI2TData = 0;
4149	sr.paI2TSegs = NULL;
4150	sr.cI2TSegs = 0;
4151	sr.cbT2IData = DataSeg.cbSeg;
4152	sr.paT2ISegs = &DataSeg;
4153	sr.cT2ISegs = 1;
4154	sr.cbSense = sizeof(sense);
4155	sr.pvSense = sense;
4156
4157	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4158	if ( RT_SUCCESS(rc)
4159	&& sr.status == SCSI_STATUS_OK)
4160	{
4161	pImage->cVolume = RT_BE2H_U64((uint64_t )&data12[0]);
4162	pImage->cVolume++;
4163	pImage->cbSector = RT_BE2H_U32((uint32_t )&data12[8]);
4164	pImage->cbSize = pImage->cVolume * pImage->cbSector;
4165	if (pImage->cVolume == 0 \|\| pImage->cbSector != 512 \|\| pImage->cbSize < pImage->cVolume)
4166	{
4167	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4168	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports media sector count=%llu sector size=%u"),
4169	pImage->pszTargetAddress, pImage->pszTargetName,
4170	pImage->LUN, pImage->cVolume, pImage->cbSector);
4171	}
4172	}
4173	else
4174	{
4175	uint8_t CDB_capfb[10];
4176
4177	RT_ZERO(data8);
4178	CDB_capfb[0] = SCSI_READ_CAPACITY;
4179	CDB_capfb[1] = 0; /* reserved */
4180	CDB_capfb[2] = 0; /* reserved */
4181	CDB_capfb[3] = 0; /* reserved */
4182	CDB_capfb[4] = 0; /* reserved */
4183	CDB_capfb[5] = 0; /* reserved */
4184	CDB_capfb[6] = 0; /* reserved */
4185	CDB_capfb[7] = 0; /* reserved */
4186	CDB_capfb[8] = 0; /* reserved */
4187	CDB_capfb[9] = 0; /* control */
4188
4189	DataSeg.pvSeg = data8;
4190	DataSeg.cbSeg = sizeof(data8);
4191
4192	sr.enmXfer = SCSIXFER_FROM_TARGET;
4193	sr.cbCDB = sizeof(CDB_capfb);
4194	sr.pvCDB = CDB_capfb;
4195	sr.cbI2TData = 0;
4196	sr.paI2TSegs = NULL;
4197	sr.cI2TSegs = 0;
4198	sr.cbT2IData = DataSeg.cbSeg;
4199	sr.paT2ISegs = &DataSeg;
4200	sr.cT2ISegs = 1;
4201	sr.cbSense = sizeof(sense);
4202	sr.pvSense = sense;
4203
4204	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4205	if (RT_SUCCESS(rc))
4206	{
4207	pImage->cVolume = (data8[0] << 24) \| (data8[1] << 16) \| (data8[2] << 8) \| data8[3];
4208	pImage->cVolume++;
4209	pImage->cbSector = (data8[4] << 24) \| (data8[5] << 16) \| (data8[6] << 8) \| data8[7];
4210	pImage->cbSize = pImage->cVolume * pImage->cbSector;
4211	if (pImage->cVolume == 0 \|\| pImage->cbSector != 512)
4212	{
4213	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4214	RT_SRC_POS, N_("iSCSI: fallback capacity detectio for target address %s, target name %s, SCSI LUN %lld reports media sector count=%llu sector size=%u"),
4215	pImage->pszTargetAddress, pImage->pszTargetName,
4216	pImage->LUN, pImage->cVolume, pImage->cbSector);
4217	}
4218	}
4219	else
4220	{
4221	LogRel(("iSCSI: Could not determine capacity of target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4222	goto out;
4223	}
4224	}
4225
4226	/*
4227	* Check the read and write cache bits.
4228	* Try to enable the cache if it is disabled.
4229	*
4230	* We already checked that this is a block access device. No need
4231	* to do it again.
4232	*/
4233	uint8_t aCachingModePage[32];
4234	uint8_t aCDBModeSense6[6];
4235
4236	memset(aCachingModePage, '\0', sizeof(aCachingModePage));
4237	aCDBModeSense6[0] = SCSI_MODE_SENSE_6;
4238	aCDBModeSense6[1] = 0;
4239	aCDBModeSense6[2] = (0x00 << 6) \| (0x08 & 0x3f); /* Current values and caching mode page */
4240	aCDBModeSense6[3] = 0; /* Sub page code. */
4241	aCDBModeSense6[4] = sizeof(aCachingModePage) & 0xff;
4242	aCDBModeSense6[5] = 0;
4243
4244	DataSeg.pvSeg = aCachingModePage;
4245	DataSeg.cbSeg = sizeof(aCachingModePage);
4246
4247	sr.enmXfer = SCSIXFER_FROM_TARGET;
4248	sr.cbCDB = sizeof(aCDBModeSense6);
4249	sr.pvCDB = aCDBModeSense6;
4250	sr.cbI2TData = 0;
4251	sr.paI2TSegs = NULL;
4252	sr.cI2TSegs = 0;
4253	sr.cbT2IData = DataSeg.cbSeg;
4254	sr.paT2ISegs = &DataSeg;
4255	sr.cT2ISegs = 1;
4256	sr.cbSense = sizeof(sense);
4257	sr.pvSense = sense;
4258	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4259	if ( RT_SUCCESS(rc)
4260	&& (sr.status == SCSI_STATUS_OK)
4261	&& (aCachingModePage[0] >= 15)
4262	&& (aCachingModePage[4 + aCachingModePage[3]] & 0x3f) == 0x08
4263	&& (aCachingModePage[4 + aCachingModePage[3] + 1] > 3))
4264	{
4265	uint32_t Offset = 4 + aCachingModePage[3];
4266	/*
4267	* Check if the read and/or the write cache is disabled.
4268	* The write cache is disabled if bit 2 (WCE) is zero and
4269	* the read cache is disabled if bit 0 (RCD) is set.
4270	*/
4271	if (!ASMBitTest(&aCachingModePage[Offset + 2], 2) \|\| ASMBitTest(&aCachingModePage[Offset + 2], 0))
4272	{
4273	/*
4274	* Write Cache Enable (WCE) bit is zero or the Read Cache Disable (RCD) is one
4275	* So one of the caches is disabled. Enable both caches.
4276	* The rest is unchanged.
4277	*/
4278	ASMBitSet(&aCachingModePage[Offset + 2], 2);
4279	ASMBitClear(&aCachingModePage[Offset + 2], 0);
4280
4281	uint8_t aCDBCaching[6];
4282	aCDBCaching[0] = SCSI_MODE_SELECT_6;
4283	aCDBCaching[1] = 0; /* Don't write the page into NV RAM. */
4284	aCDBCaching[2] = 0;
4285	aCDBCaching[3] = 0;
4286	aCDBCaching[4] = sizeof(aCachingModePage) & 0xff;
4287	aCDBCaching[5] = 0;
4288
4289	DataSeg.pvSeg = aCachingModePage;
4290	DataSeg.cbSeg = sizeof(aCachingModePage);
4291
4292	sr.enmXfer = SCSIXFER_TO_TARGET;
4293	sr.cbCDB = sizeof(aCDBCaching);
4294	sr.pvCDB = aCDBCaching;
4295	sr.cbI2TData = DataSeg.cbSeg;
4296	sr.paI2TSegs = &DataSeg;
4297	sr.cI2TSegs = 1;
4298	sr.cbT2IData = 0;
4299	sr.paT2ISegs = NULL;
4300	sr.cT2ISegs = 0;
4301	sr.cbSense = sizeof(sense);
4302	sr.pvSense = sense;
4303	sr.status = 0;
4304	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4305	if ( RT_SUCCESS(rc)
4306	&& (sr.status == SCSI_STATUS_OK))
4307	{
4308	LogRel(("iSCSI: Enabled read and write cache of target %s\n", pImage->pszTargetName));
4309	}
4310	else
4311	{
4312	/* Log failures but continue. */
4313	LogRel(("iSCSI: Could not enable read and write cache of target %s, rc=%Rrc status=%#x\n",
4314	pImage->pszTargetName, rc, sr.status));
4315	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sense));
4316	rc = VINF_SUCCESS;
4317	}
4318	}
4319	}
4320	else
4321	{
4322	/* Log errors but continue. */
4323	LogRel(("iSCSI: Could not check write cache of target %s, rc=%Rrc, got mode page %#x\n", pImage->pszTargetName, rc,aCachingModePage[0] & 0x3f));
4324	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sense));
4325	rc = VINF_SUCCESS;
4326	}
4327
4328	out:
4329	if (RT_FAILURE(rc))
4330	iscsiFreeImage(pImage, false);
4331	return rc;
4332	}
4333
4334
4335	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
4336	static int iscsiCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
4337	PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
4338	{
4339	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
4340
4341	/* iSCSI images can't be checked for validity this way, as the filename
4342	* just can't supply enough configuration information. */
4343	int rc = VERR_VD_ISCSI_INVALID_HEADER;
4344
4345	LogFlowFunc(("returns %Rrc\n", rc));
4346	return rc;
4347	}
4348
4349	/** @copydoc VBOXHDDBACKEND::pfnOpen */
4350	static int iscsiOpen(const char *pszFilename, unsigned uOpenFlags,
4351	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
4352	VDTYPE enmType, void **ppBackendData)
4353	{
4354	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
4355	int rc;
4356	PISCSIIMAGE pImage;
4357
4358	/* Check open flags. All valid flags are supported. */
4359	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
4360	{
4361	rc = VERR_INVALID_PARAMETER;
4362	goto out;
4363	}
4364
4365	/* Check remaining arguments. */
4366	if ( !VALID_PTR(pszFilename)
4367	\|\| !*pszFilename
4368	\|\| strchr(pszFilename, '"'))
4369	{
4370	rc = VERR_INVALID_PARAMETER;
4371	goto out;
4372	}
4373
4374	pImage = (PISCSIIMAGE)RTMemAllocZ(sizeof(ISCSIIMAGE));
4375	if (!pImage)
4376	{
4377	rc = VERR_NO_MEMORY;
4378	goto out;
4379	}
4380
4381	pImage->pszFilename = pszFilename;
4382	pImage->pszInitiatorName = NULL;
4383	pImage->pszTargetName = NULL;
4384	pImage->pszTargetAddress = NULL;
4385	pImage->pszInitiatorUsername = NULL;
4386	pImage->pbInitiatorSecret = NULL;
4387	pImage->pszTargetUsername = NULL;
4388	pImage->pbTargetSecret = NULL;
4389	pImage->paCurrReq = NULL;
4390	pImage->pvRecvPDUBuf = NULL;
4391	pImage->pszHostname = NULL;
4392	pImage->pVDIfsDisk = pVDIfsDisk;
4393	pImage->pVDIfsImage = pVDIfsImage;
4394	pImage->cLogRelErrors = 0;
4395
4396	rc = iscsiOpenImage(pImage, uOpenFlags);
4397	if (RT_SUCCESS(rc))
4398	{
4399	LogFlowFunc(("target %s cVolume %d, cbSector %d\n", pImage->pszTargetName, pImage->cVolume, pImage->cbSector));
4400	LogRel(("iSCSI: target address %s, target name %s, SCSI LUN %lld\n", pImage->pszTargetAddress, pImage->pszTargetName, pImage->LUN));
4401	*ppBackendData = pImage;
4402	}
4403	else
4404	RTMemFree(pImage);
4405
4406	out:
4407	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
4408	return rc;
4409	}
4410
4411	/** @copydoc VBOXHDDBACKEND::pfnCreate */
4412	static int iscsiCreate(const char *pszFilename, uint64_t cbSize,
4413	unsigned uImageFlags, const char *pszComment,
4414	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
4415	PCRTUUID pUuid, unsigned uOpenFlags,
4416	unsigned uPercentStart, unsigned uPercentSpan,
4417	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
4418	PVDINTERFACE pVDIfsOperation, void **ppBackendData)
4419	{
4420	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 ppBackendData=%#p", pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, ppBackendData));
4421	int rc = VERR_NOT_SUPPORTED;
4422
4423	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
4424	return rc;
4425	}
4426
4427	/** @copydoc VBOXHDDBACKEND::pfnClose */
4428	static int iscsiClose(void *pBackendData, bool fDelete)
4429	{
4430	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
4431	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4432	int rc;
4433
4434	Assert(!fDelete); /* This flag is unsupported. */
4435
4436	rc = iscsiFreeImage(pImage, fDelete);
4437	RTMemFree(pImage);
4438
4439	LogFlowFunc(("returns %Rrc\n", rc));
4440	return rc;
4441	}
4442
4443	/** @copydoc VBOXHDDBACKEND::pfnRead */
4444	static int iscsiRead(void pBackendData, uint64_t uOffset, void pvBuf,
4445	size_t cbToRead, size_t *pcbActuallyRead)
4446	{
4447	/** @todo reinstate logging of the target everywhere - dropped temporarily */
4448	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n", pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
4449	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4450	uint64_t lba;
4451	uint16_t tls;
4452	int rc;
4453
4454	Assert(pImage);
4455	Assert(uOffset % 512 == 0);
4456	Assert(cbToRead % 512 == 0);
4457
4458	Assert(pImage->cbSector);
4459	AssertPtr(pvBuf);
4460
4461	if ( uOffset + cbToRead > pImage->cbSize
4462	\|\| cbToRead == 0)
4463	{
4464	rc = VERR_INVALID_PARAMETER;
4465	goto out;
4466	}
4467
4468	/*
4469	* Clip read size to a value which is supported by the target.
4470	*/
4471	cbToRead = RT_MIN(cbToRead, pImage->cbRecvDataLength);
4472
4473	lba = uOffset / pImage->cbSector;
4474	tls = (uint16_t)(cbToRead / pImage->cbSector);
4475	SCSIREQ sr;
4476	RTSGSEG T2ISeg;
4477	size_t cbCDB;
4478	uint8_t abCDB[16];
4479	uint8_t sense[96];
4480
4481	if (pImage->cVolume < _4G)
4482	{
4483	cbCDB = 10;
4484	abCDB[0] = SCSI_READ_10;
4485	abCDB[1] = 0; /* reserved */
4486	abCDB[2] = (lba >> 24) & 0xff;
4487	abCDB[3] = (lba >> 16) & 0xff;
4488	abCDB[4] = (lba >> 8) & 0xff;
4489	abCDB[5] = lba & 0xff;
4490	abCDB[6] = 0; /* reserved */
4491	abCDB[7] = (tls >> 8) & 0xff;
4492	abCDB[8] = tls & 0xff;
4493	abCDB[9] = 0; /* control */
4494	}
4495	else
4496	{
4497	cbCDB = 16;
4498	abCDB[0] = SCSI_READ_16;
4499	abCDB[1] = 0; /* reserved */
4500	abCDB[2] = (lba >> 56) & 0xff;
4501	abCDB[3] = (lba >> 48) & 0xff;
4502	abCDB[4] = (lba >> 40) & 0xff;
4503	abCDB[5] = (lba >> 32) & 0xff;
4504	abCDB[6] = (lba >> 24) & 0xff;
4505	abCDB[7] = (lba >> 16) & 0xff;
4506	abCDB[8] = (lba >> 8) & 0xff;
4507	abCDB[9] = lba & 0xff;
4508	abCDB[10] = 0; /* tls unused */
4509	abCDB[11] = 0; /* tls unused */
4510	abCDB[12] = (tls >> 8) & 0xff;
4511	abCDB[13] = tls & 0xff;
4512	abCDB[14] = 0; /* reserved */
4513	abCDB[15] = 0; /* reserved */
4514	}
4515
4516	T2ISeg.pvSeg = pvBuf;
4517	T2ISeg.cbSeg = cbToRead;
4518
4519	sr.enmXfer = SCSIXFER_FROM_TARGET;
4520	sr.cbCDB = cbCDB;
4521	sr.pvCDB = abCDB;
4522	sr.cbI2TData = 0;
4523	sr.paI2TSegs = NULL;
4524	sr.cI2TSegs = 0;
4525	sr.cbT2IData = cbToRead;
4526	sr.paT2ISegs = &T2ISeg;
4527	sr.cT2ISegs = 1;
4528	sr.cbSense = sizeof(sense);
4529	sr.pvSense = sense;
4530
4531	rc = iscsiCommandSync(pImage, &sr, true, VERR_READ_ERROR);
4532	if (RT_FAILURE(rc))
4533	{
4534	LogFlow(("iscsiCommandSync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
4535	*pcbActuallyRead = 0;
4536	}
4537	else
4538	*pcbActuallyRead = sr.cbT2IData;
4539
4540	out:
4541	LogFlowFunc(("returns %Rrc\n", rc));
4542	return rc;
4543	}
4544
4545	/** @copydoc VBOXHDDBACKEND::pfnWrite */
4546	static int iscsiWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
4547	size_t cbToWrite, size_t *pcbWriteProcess,
4548	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
4549	{
4550	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n", pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
4551	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4552	uint64_t lba;
4553	uint16_t tls;
4554	int rc;
4555
4556	Assert(pImage);
4557	Assert(uOffset % 512 == 0);
4558	Assert(cbToWrite % 512 == 0);
4559
4560	Assert(pImage->cbSector);
4561	Assert(pvBuf);
4562
4563	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
4564	{
4565	rc = VERR_VD_IMAGE_READ_ONLY;
4566	goto out;
4567	}
4568
4569	*pcbPreRead = 0;
4570	*pcbPostRead = 0;
4571
4572	/*
4573	* Clip write size to a value which is supported by the target.
4574	*/
4575	cbToWrite = RT_MIN(cbToWrite, pImage->cbSendDataLength);
4576
4577	lba = uOffset / pImage->cbSector;
4578	tls = (uint16_t)(cbToWrite / pImage->cbSector);
4579	SCSIREQ sr;
4580	RTSGSEG I2TSeg;
4581	size_t cbCDB;
4582	uint8_t abCDB[16];
4583	uint8_t sense[96];
4584
4585	if (pImage->cVolume < _4G)
4586	{
4587	cbCDB = 10;
4588	abCDB[0] = SCSI_WRITE_10;
4589	abCDB[1] = 0; /* reserved */
4590	abCDB[2] = (lba >> 24) & 0xff;
4591	abCDB[3] = (lba >> 16) & 0xff;
4592	abCDB[4] = (lba >> 8) & 0xff;
4593	abCDB[5] = lba & 0xff;
4594	abCDB[6] = 0; /* reserved */
4595	abCDB[7] = (tls >> 8) & 0xff;
4596	abCDB[8] = tls & 0xff;
4597	abCDB[9] = 0; /* control */
4598	}
4599	else
4600	{
4601	cbCDB = 16;
4602	abCDB[0] = SCSI_WRITE_16;
4603	abCDB[1] = 0; /* reserved */
4604	abCDB[2] = (lba >> 56) & 0xff;
4605	abCDB[3] = (lba >> 48) & 0xff;
4606	abCDB[4] = (lba >> 40) & 0xff;
4607	abCDB[5] = (lba >> 32) & 0xff;
4608	abCDB[6] = (lba >> 24) & 0xff;
4609	abCDB[7] = (lba >> 16) & 0xff;
4610	abCDB[8] = (lba >> 8) & 0xff;
4611	abCDB[9] = lba & 0xff;
4612	abCDB[10] = 0; /* tls unused */
4613	abCDB[11] = 0; /* tls unused */
4614	abCDB[12] = (tls >> 8) & 0xff;
4615	abCDB[13] = tls & 0xff;
4616	abCDB[14] = 0; /* reserved */
4617	abCDB[15] = 0; /* reserved */
4618	}
4619
4620	I2TSeg.pvSeg = (void *)pvBuf;
4621	I2TSeg.cbSeg = cbToWrite;
4622
4623	sr.enmXfer = SCSIXFER_TO_TARGET;
4624	sr.cbCDB = cbCDB;
4625	sr.pvCDB = abCDB;
4626	sr.cbI2TData = cbToWrite;
4627	sr.paI2TSegs = &I2TSeg;
4628	sr.cI2TSegs = 1;
4629	sr.cbT2IData = 0;
4630	sr.paT2ISegs = NULL;
4631	sr.cT2ISegs = 0;
4632	sr.cbSense = sizeof(sense);
4633	sr.pvSense = sense;
4634
4635	rc = iscsiCommandSync(pImage, &sr, true, VERR_WRITE_ERROR);
4636	if (RT_FAILURE(rc))
4637	{
4638	LogFlow(("iscsiCommandSync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
4639	*pcbWriteProcess = 0;
4640	}
4641	else
4642	*pcbWriteProcess = cbToWrite;
4643
4644	out:
4645	LogFlowFunc(("returns %Rrc\n", rc));
4646	return rc;
4647	}
4648
4649	/** @copydoc VBOXHDDBACKEND::pfnFlush */
4650	static int iscsiFlush(void *pBackendData)
4651	{
4652	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4653	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4654	int rc;
4655
4656	Assert(pImage);
4657
4658	SCSIREQ sr;
4659	uint8_t abCDB[10];
4660	uint8_t sense[96];
4661
4662	abCDB[0] = SCSI_SYNCHRONIZE_CACHE;
4663	abCDB[1] = 0; /* reserved */
4664	abCDB[2] = 0; /* LBA 0 */
4665	abCDB[3] = 0; /* LBA 0 */
4666	abCDB[4] = 0; /* LBA 0 */
4667	abCDB[5] = 0; /* LBA 0 */
4668	abCDB[6] = 0; /* reserved */
4669	abCDB[7] = 0; /* transfer everything to disk */
4670	abCDB[8] = 0; /* transfer everything to disk */
4671	abCDB[9] = 0; /* control */
4672
4673	sr.enmXfer = SCSIXFER_NONE;
4674	sr.cbCDB = sizeof(abCDB);
4675	sr.pvCDB = abCDB;
4676	sr.cbI2TData = 0;
4677	sr.paI2TSegs = NULL;
4678	sr.cI2TSegs = 0;
4679	sr.cbT2IData = 0;
4680	sr.paT2ISegs = NULL;
4681	sr.cT2ISegs = 0;
4682	sr.cbSense = sizeof(sense);
4683	sr.pvSense = sense;
4684
4685	rc = iscsiCommandSync(pImage, &sr, false, VINF_SUCCESS);
4686	if (RT_FAILURE(rc))
4687	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
4688	LogFlowFunc(("returns %Rrc\n", rc));
4689	return rc;
4690	}
4691
4692	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
4693	static unsigned iscsiGetVersion(void *pBackendData)
4694	{
4695	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4696	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4697
4698	Assert(pImage);
4699	NOREF(pImage);
4700
4701	return 0;
4702	}
4703
4704	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
4705	static uint64_t iscsiGetSize(void *pBackendData)
4706	{
4707	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4708	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4709
4710	Assert(pImage);
4711
4712	if (pImage)
4713	return pImage->cbSize;
4714	else
4715	return 0;
4716	}
4717
4718	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
4719	static uint64_t iscsiGetFileSize(void *pBackendData)
4720	{
4721	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4722	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4723
4724	Assert(pImage);
4725	NOREF(pImage);
4726
4727	if (pImage)
4728	return pImage->cbSize;
4729	else
4730	return 0;
4731	}
4732
4733	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
4734	static int iscsiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
4735	{
4736	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
4737	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4738	int rc;
4739
4740	Assert(pImage);
4741
4742	if (pImage)
4743	rc = VERR_VD_GEOMETRY_NOT_SET;
4744	else
4745	rc = VERR_VD_NOT_OPENED;
4746
4747	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
4748	return rc;
4749	}
4750
4751	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
4752	static int iscsiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
4753	{
4754	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
4755	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4756	int rc;
4757
4758	Assert(pImage);
4759
4760	if (pImage)
4761	{
4762	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
4763	{
4764	rc = VERR_VD_IMAGE_READ_ONLY;
4765	goto out;
4766	}
4767	rc = VERR_VD_GEOMETRY_NOT_SET;
4768	}
4769	else
4770	rc = VERR_VD_NOT_OPENED;
4771
4772	out:
4773	LogFlowFunc(("returns %Rrc\n", rc));
4774	return rc;
4775	}
4776
4777	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
4778	static int iscsiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
4779	{
4780	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
4781	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4782	int rc;
4783
4784	Assert(pImage);
4785
4786	if (pImage)
4787	rc = VERR_VD_GEOMETRY_NOT_SET;
4788	else
4789	rc = VERR_VD_NOT_OPENED;
4790
4791	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
4792	return rc;
4793	}
4794
4795	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
4796	static int iscsiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
4797	{
4798	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
4799	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4800	int rc;
4801
4802	Assert(pImage);
4803
4804	if (pImage)
4805	{
4806	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
4807	{
4808	rc = VERR_VD_IMAGE_READ_ONLY;
4809	goto out;
4810	}
4811	rc = VERR_VD_GEOMETRY_NOT_SET;
4812	}
4813	else
4814	rc = VERR_VD_NOT_OPENED;
4815
4816	out:
4817	LogFlowFunc(("returns %Rrc\n", rc));
4818	return rc;
4819	}
4820
4821	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
4822	static unsigned iscsiGetImageFlags(void *pBackendData)
4823	{
4824	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4825	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4826	unsigned uImageFlags;
4827
4828	Assert(pImage);
4829	NOREF(pImage);
4830
4831	uImageFlags = VD_IMAGE_FLAGS_FIXED;
4832
4833	LogFlowFunc(("returns %#x\n", uImageFlags));
4834	return uImageFlags;
4835	}
4836
4837	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
4838	static unsigned iscsiGetOpenFlags(void *pBackendData)
4839	{
4840	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4841	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4842	unsigned uOpenFlags;
4843
4844	Assert(pImage);
4845
4846	if (pImage)
4847	uOpenFlags = pImage->uOpenFlags;
4848	else
4849	uOpenFlags = 0;
4850
4851	LogFlowFunc(("returns %#x\n", uOpenFlags));
4852	return uOpenFlags;
4853	}
4854
4855	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
4856	static int iscsiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
4857	{
4858	LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
4859	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4860	int rc;
4861
4862	/* Image must be opened and the new flags must be valid. */
4863	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE \| VD_OPEN_FLAGS_SEQUENTIAL)))
4864	{
4865	rc = VERR_INVALID_PARAMETER;
4866	goto out;
4867	}
4868
4869	/* Implement this operation via reopening the image if we actually need
4870	* to do something. A read/write -> readonly transition doesn't need a
4871	* reopen. In the other direction we don't have the necessary information
4872	* as the "disk is readonly" flag is thrown away. Can be optimized too,
4873	* but it's not worth the effort at the moment. */
4874	if ( !(uOpenFlags & VD_OPEN_FLAGS_READONLY)
4875	&& (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
4876	{
4877	iscsiFreeImage(pImage, false);
4878	rc = iscsiOpenImage(pImage, uOpenFlags);
4879	}
4880	else
4881	{
4882	pImage->uOpenFlags = uOpenFlags;
4883	rc = VINF_SUCCESS;
4884	}
4885	out:
4886	LogFlowFunc(("returns %Rrc\n", rc));
4887	return rc;
4888	}
4889
4890	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
4891	static int iscsiGetComment(void pBackendData, char pszComment,
4892	size_t cbComment)
4893	{
4894	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
4895	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4896	int rc;
4897
4898	Assert(pImage);
4899
4900	if (pImage)
4901	rc = VERR_NOT_SUPPORTED;
4902	else
4903	rc = VERR_VD_NOT_OPENED;
4904
4905	LogFlowFunc(("returns %Rrc comment='%s'\n", rc, pszComment));
4906	return rc;
4907	}
4908
4909	/** @copydoc VBOXHDDBACKEND::pfnSetComment */
4910	static int iscsiSetComment(void pBackendData, const char pszComment)
4911	{
4912	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
4913	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4914	int rc;
4915
4916	Assert(pImage);
4917
4918	if (pImage)
4919	{
4920	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
4921	rc = VERR_NOT_SUPPORTED;
4922	else
4923	rc = VERR_VD_IMAGE_READ_ONLY;
4924	}
4925	else
4926	rc = VERR_VD_NOT_OPENED;
4927
4928	LogFlowFunc(("returns %Rrc\n", rc));
4929	return rc;
4930	}
4931
4932	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
4933	static int iscsiGetUuid(void *pBackendData, PRTUUID pUuid)
4934	{
4935	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
4936	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4937	int rc;
4938
4939	Assert(pImage);
4940
4941	if (pImage)
4942	rc = VERR_NOT_SUPPORTED;
4943	else
4944	rc = VERR_VD_NOT_OPENED;
4945
4946	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
4947	return rc;
4948	}
4949
4950	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
4951	static int iscsiSetUuid(void *pBackendData, PCRTUUID pUuid)
4952	{
4953	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
4954	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4955	int rc;
4956
4957	LogFlowFunc(("%RTuuid\n", pUuid));
4958	Assert(pImage);
4959
4960	if (pImage)
4961	{
4962	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
4963	rc = VERR_NOT_SUPPORTED;
4964	else
4965	rc = VERR_VD_IMAGE_READ_ONLY;
4966	}
4967	else
4968	rc = VERR_VD_NOT_OPENED;
4969
4970	LogFlowFunc(("returns %Rrc\n", rc));
4971	return rc;
4972	}
4973
4974	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
4975	static int iscsiGetModificationUuid(void *pBackendData, PRTUUID pUuid)
4976	{
4977	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
4978	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4979	int rc;
4980
4981	Assert(pImage);
4982
4983	if (pImage)
4984	rc = VERR_NOT_SUPPORTED;
4985	else
4986	rc = VERR_VD_NOT_OPENED;
4987
4988	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
4989	return rc;
4990	}
4991
4992	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
4993	static int iscsiSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
4994	{
4995	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
4996	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4997	int rc;
4998
4999	LogFlowFunc(("%RTuuid\n", pUuid));
5000	Assert(pImage);
5001
5002	if (pImage)
5003	{
5004	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
5005	rc = VERR_NOT_SUPPORTED;
5006	else
5007	rc = VERR_VD_IMAGE_READ_ONLY;
5008	}
5009	else
5010	rc = VERR_VD_NOT_OPENED;
5011
5012	LogFlowFunc(("returns %Rrc\n", rc));
5013	return rc;
5014	}
5015
5016	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
5017	static int iscsiGetParentUuid(void *pBackendData, PRTUUID pUuid)
5018	{
5019	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
5020	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5021	int rc;
5022
5023	Assert(pImage);
5024
5025	if (pImage)
5026	rc = VERR_NOT_SUPPORTED;
5027	else
5028	rc = VERR_VD_NOT_OPENED;
5029
5030	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
5031	return rc;
5032	}
5033
5034	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
5035	static int iscsiSetParentUuid(void *pBackendData, PCRTUUID pUuid)
5036	{
5037	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
5038	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5039	int rc;
5040
5041	LogFlowFunc(("%RTuuid\n", pUuid));
5042	Assert(pImage);
5043
5044	if (pImage)
5045	{
5046	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
5047	rc = VERR_NOT_SUPPORTED;
5048	else
5049	rc = VERR_VD_IMAGE_READ_ONLY;
5050	}
5051	else
5052	rc = VERR_VD_NOT_OPENED;
5053
5054	LogFlowFunc(("returns %Rrc\n", rc));
5055	return rc;
5056	}
5057
5058	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
5059	static int iscsiGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
5060	{
5061	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
5062	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5063	int rc;
5064
5065	Assert(pImage);
5066
5067	if (pImage)
5068	rc = VERR_NOT_SUPPORTED;
5069	else
5070	rc = VERR_VD_NOT_OPENED;
5071
5072	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
5073	return rc;
5074	}
5075
5076	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
5077	static int iscsiSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
5078	{
5079	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
5080	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5081	int rc;
5082
5083	LogFlowFunc(("%RTuuid\n", pUuid));
5084	Assert(pImage);
5085
5086	if (pImage)
5087	{
5088	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
5089	rc = VERR_NOT_SUPPORTED;
5090	else
5091	rc = VERR_VD_IMAGE_READ_ONLY;
5092	}
5093	else
5094	rc = VERR_VD_NOT_OPENED;
5095
5096	LogFlowFunc(("returns %Rrc\n", rc));
5097	return rc;
5098	}
5099
5100	/** @copydoc VBOXHDDBACKEND::pfnDump */
5101	static void iscsiDump(void *pBackendData)
5102	{
5103	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5104
5105	Assert(pImage);
5106	if (pImage)
5107	{
5108	/** @todo put something useful here */
5109	vdIfErrorMessage(pImage->pIfError, "Header: cVolume=%u\n", pImage->cVolume);
5110	}
5111	}
5112
5113	/** @copydoc VBOXHDDBACKEND::pfnAsyncRead */
5114	static int iscsiAsyncRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
5115	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
5116	{
5117	LogFlowFunc(("pBackendData=%p uOffset=%#llx pIoCtx=%#p cbToRead=%u pcbActuallyRead=%p\n",
5118	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
5119	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5120	int rc = VINF_SUCCESS;
5121
5122	if (uOffset + cbToRead > pImage->cbSize)
5123	return VERR_INVALID_PARAMETER;
5124
5125	/*
5126	* Clip read size to a value which is supported by the target.
5127	*/
5128	cbToRead = RT_MIN(cbToRead, pImage->cbRecvDataLength);
5129
5130	unsigned cT2ISegs = 0;
5131	size_t cbSegs = 0;
5132
5133	/* Get the number of segments. */
5134	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5135	NULL, &cT2ISegs, cbToRead);
5136	Assert(cbSegs == cbToRead);
5137
5138	PSCSIREQASYNC pReqAsync = (PSCSIREQASYNC)RTMemAllocZ(RT_OFFSETOF(SCSIREQASYNC, aSegs[cT2ISegs]));
5139	if (RT_LIKELY(pReqAsync))
5140	{
5141	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(sizeof(SCSIREQ));
5142	if (pReq)
5143	{
5144	uint64_t lba;
5145	uint16_t tls;
5146	uint8_t *pbCDB = &pReqAsync->abCDB[0];
5147	size_t cbCDB;
5148
5149	lba = uOffset / pImage->cbSector;
5150	tls = (uint16_t)(cbToRead / pImage->cbSector);
5151
5152	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5153	&pReqAsync->aSegs[0],
5154	&cT2ISegs, cbToRead);
5155	Assert(cbSegs == cbToRead);
5156	pReqAsync->cT2ISegs = cT2ISegs;
5157	pReqAsync->pIoCtx = pIoCtx;
5158	pReqAsync->pScsiReq = pReq;
5159	pReqAsync->cSenseRetries = 10;
5160	pReqAsync->rcSense = VERR_READ_ERROR;
5161
5162	if (pImage->cVolume < _4G)
5163	{
5164	cbCDB = 10;
5165	pbCDB[0] = SCSI_READ_10;
5166	pbCDB[1] = 0; /* reserved */
5167	pbCDB[2] = (lba >> 24) & 0xff;
5168	pbCDB[3] = (lba >> 16) & 0xff;
5169	pbCDB[4] = (lba >> 8) & 0xff;
5170	pbCDB[5] = lba & 0xff;
5171	pbCDB[6] = 0; /* reserved */
5172	pbCDB[7] = (tls >> 8) & 0xff;
5173	pbCDB[8] = tls & 0xff;
5174	pbCDB[9] = 0; /* control */
5175	}
5176	else
5177	{
5178	cbCDB = 16;
5179	pbCDB[0] = SCSI_READ_16;
5180	pbCDB[1] = 0; /* reserved */
5181	pbCDB[2] = (lba >> 56) & 0xff;
5182	pbCDB[3] = (lba >> 48) & 0xff;
5183	pbCDB[4] = (lba >> 40) & 0xff;
5184	pbCDB[5] = (lba >> 32) & 0xff;
5185	pbCDB[6] = (lba >> 24) & 0xff;
5186	pbCDB[7] = (lba >> 16) & 0xff;
5187	pbCDB[8] = (lba >> 8) & 0xff;
5188	pbCDB[9] = lba & 0xff;
5189	pbCDB[10] = 0; /* tls unused */
5190	pbCDB[11] = 0; /* tls unused */
5191	pbCDB[12] = (tls >> 8) & 0xff;
5192	pbCDB[13] = tls & 0xff;
5193	pbCDB[14] = 0; /* reserved */
5194	pbCDB[15] = 0; /* reserved */
5195	}
5196
5197	pReq->enmXfer = SCSIXFER_FROM_TARGET;
5198	pReq->cbCDB = cbCDB;
5199	pReq->pvCDB = pReqAsync->abCDB;
5200	pReq->cbI2TData = 0;
5201	pReq->paI2TSegs = NULL;
5202	pReq->cI2TSegs = 0;
5203	pReq->cbT2IData = cbToRead;
5204	pReq->paT2ISegs = &pReqAsync->aSegs[pReqAsync->cI2TSegs];
5205	pReq->cT2ISegs = pReqAsync->cT2ISegs;
5206	pReq->cbSense = sizeof(pReqAsync->abSense);
5207	pReq->pvSense = pReqAsync->abSense;
5208
5209	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReqAsync);
5210	if (RT_FAILURE(rc))
5211	AssertMsgFailed(("iscsiCommand(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
5212	else
5213	{
5214	*pcbActuallyRead = cbToRead;
5215	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5216	}
5217
5218	RTMemFree(pReq);
5219	}
5220	else
5221	rc = VERR_NO_MEMORY;
5222
5223	RTMemFree(pReqAsync);
5224	}
5225	else
5226	rc = VERR_NO_MEMORY;
5227
5228	LogFlowFunc(("returns rc=%Rrc\n", rc));
5229	return rc;
5230	}
5231
5232	/** @copydoc VBOXHDDBACKEND::pfnAsyncWrite */
5233	static int iscsiAsyncWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
5234	PVDIOCTX pIoCtx,
5235	size_t pcbWriteProcess, size_t pcbPreRead,
5236	size_t *pcbPostRead, unsigned fWrite)
5237	{
5238	LogFlowFunc(("pBackendData=%p uOffset=%llu pIoCtx=%#p cbToWrite=%u pcbWriteProcess=%p pcbPreRead=%p pcbPostRead=%p fWrite=%u\n",
5239	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead, fWrite));
5240	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5241	int rc = VINF_SUCCESS;
5242
5243	AssertPtr(pImage);
5244	Assert(uOffset % 512 == 0);
5245	Assert(cbToWrite % 512 == 0);
5246
5247	if (uOffset + cbToWrite > pImage->cbSize)
5248	return VERR_INVALID_PARAMETER;
5249
5250	/*
5251	* Clip read size to a value which is supported by the target.
5252	*/
5253	cbToWrite = RT_MIN(cbToWrite, pImage->cbSendDataLength);
5254
5255	unsigned cI2TSegs = 0;
5256	size_t cbSegs = 0;
5257
5258	/* Get the number of segments. */
5259	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5260	NULL, &cI2TSegs, cbToWrite);
5261	Assert(cbSegs == cbToWrite);
5262
5263	PSCSIREQASYNC pReqAsync = (PSCSIREQASYNC)RTMemAllocZ(RT_OFFSETOF(SCSIREQASYNC, aSegs[cI2TSegs]));
5264	if (RT_LIKELY(pReqAsync))
5265	{
5266	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(sizeof(SCSIREQ));
5267	if (pReq)
5268	{
5269	uint64_t lba;
5270	uint16_t tls;
5271	uint8_t *pbCDB = &pReqAsync->abCDB[0];
5272	size_t cbCDB;
5273
5274	lba = uOffset / pImage->cbSector;
5275	tls = (uint16_t)(cbToWrite / pImage->cbSector);
5276
5277	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5278	&pReqAsync->aSegs[0],
5279	&cI2TSegs, cbToWrite);
5280	Assert(cbSegs == cbToWrite);
5281	pReqAsync->cI2TSegs = cI2TSegs;
5282	pReqAsync->pIoCtx = pIoCtx;
5283	pReqAsync->pScsiReq = pReq;
5284	pReqAsync->cSenseRetries = 10;
5285	pReqAsync->rcSense = VERR_WRITE_ERROR;
5286
5287	if (pImage->cVolume < _4G)
5288	{
5289	cbCDB = 10;
5290	pbCDB[0] = SCSI_WRITE_10;
5291	pbCDB[1] = 0; /* reserved */
5292	pbCDB[2] = (lba >> 24) & 0xff;
5293	pbCDB[3] = (lba >> 16) & 0xff;
5294	pbCDB[4] = (lba >> 8) & 0xff;
5295	pbCDB[5] = lba & 0xff;
5296	pbCDB[6] = 0; /* reserved */
5297	pbCDB[7] = (tls >> 8) & 0xff;
5298	pbCDB[8] = tls & 0xff;
5299	pbCDB[9] = 0; /* control */
5300	}
5301	else
5302	{
5303	cbCDB = 16;
5304	pbCDB[0] = SCSI_WRITE_16;
5305	pbCDB[1] = 0; /* reserved */
5306	pbCDB[2] = (lba >> 56) & 0xff;
5307	pbCDB[3] = (lba >> 48) & 0xff;
5308	pbCDB[4] = (lba >> 40) & 0xff;
5309	pbCDB[5] = (lba >> 32) & 0xff;
5310	pbCDB[6] = (lba >> 24) & 0xff;
5311	pbCDB[7] = (lba >> 16) & 0xff;
5312	pbCDB[8] = (lba >> 8) & 0xff;
5313	pbCDB[9] = lba & 0xff;
5314	pbCDB[10] = 0; /* tls unused */
5315	pbCDB[11] = 0; /* tls unused */
5316	pbCDB[12] = (tls >> 8) & 0xff;
5317	pbCDB[13] = tls & 0xff;
5318	pbCDB[14] = 0; /* reserved */
5319	pbCDB[15] = 0; /* reserved */
5320	}
5321
5322	pReq->enmXfer = SCSIXFER_TO_TARGET;
5323	pReq->cbCDB = cbCDB;
5324	pReq->pvCDB = pReqAsync->abCDB;
5325	pReq->cbI2TData = cbToWrite;
5326	pReq->paI2TSegs = &pReqAsync->aSegs[0];
5327	pReq->cI2TSegs = pReqAsync->cI2TSegs;
5328	pReq->cbT2IData = 0;
5329	pReq->paT2ISegs = NULL;
5330	pReq->cT2ISegs = 0;
5331	pReq->cbSense = sizeof(pReqAsync->abSense);
5332	pReq->pvSense = pReqAsync->abSense;
5333
5334	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReqAsync);
5335	if (RT_FAILURE(rc))
5336	AssertMsgFailed(("iscsiCommand(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
5337	else
5338	{
5339	*pcbWriteProcess = cbToWrite;
5340	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5341	}
5342
5343	RTMemFree(pReq);
5344	}
5345	else
5346	rc = VERR_NO_MEMORY;
5347
5348	RTMemFree(pReqAsync);
5349	}
5350	else
5351	rc = VERR_NO_MEMORY;
5352
5353	LogFlowFunc(("returns rc=%Rrc\n", rc));
5354	return rc;
5355	}
5356
5357	/** @copydoc VBOXHDDBACKEND::pfnAsyncFlush */
5358	static int iscsiAsyncFlush(void *pBackendData, PVDIOCTX pIoCtx)
5359	{
5360	LogFlowFunc(("pBackendData=%p pIoCtx=%#p\n", pBackendData, pIoCtx));
5361	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5362	int rc = VINF_SUCCESS;
5363
5364	PSCSIREQASYNC pReqAsync = (PSCSIREQASYNC)RTMemAllocZ(sizeof(SCSIREQASYNC));
5365	if (RT_LIKELY(pReqAsync))
5366	{
5367	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(sizeof(SCSIREQ));
5368	if (pReq)
5369	{
5370	uint8_t *pbCDB = &pReqAsync->abCDB[0];
5371
5372	pReqAsync->pIoCtx = pIoCtx;
5373	pReqAsync->pScsiReq = pReq;
5374	pReqAsync->cSenseRetries = 0;
5375	pReqAsync->rcSense = VINF_SUCCESS;
5376
5377	pbCDB[0] = SCSI_SYNCHRONIZE_CACHE;
5378	pbCDB[1] = 0; /* reserved */
5379	pbCDB[2] = 0; /* reserved */
5380	pbCDB[3] = 0; /* reserved */
5381	pbCDB[4] = 0; /* reserved */
5382	pbCDB[5] = 0; /* reserved */
5383	pbCDB[6] = 0; /* reserved */
5384	pbCDB[7] = 0; /* reserved */
5385	pbCDB[8] = 0; /* reserved */
5386	pbCDB[9] = 0; /* control */
5387
5388	pReq->enmXfer = SCSIXFER_NONE;
5389	pReq->cbCDB = 10;
5390	pReq->pvCDB = pReqAsync->abCDB;
5391	pReq->cbI2TData = 0;
5392	pReq->paI2TSegs = NULL;
5393	pReq->cI2TSegs = 0;
5394	pReq->cbT2IData = 0;
5395	pReq->paT2ISegs = NULL;
5396	pReq->cT2ISegs = 0;
5397	pReq->cbSense = sizeof(pReqAsync->abSense);
5398	pReq->pvSense = pReqAsync->abSense;
5399
5400	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReqAsync);
5401	if (RT_FAILURE(rc))
5402	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
5403	else
5404	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5405
5406	RTMemFree(pReq);
5407	}
5408	else
5409	rc = VERR_NO_MEMORY;
5410
5411	RTMemFree(pReqAsync);
5412	}
5413	else
5414	rc = VERR_NO_MEMORY;
5415
5416	LogFlowFunc(("returns rc=%Rrc\n", rc));
5417	return rc;
5418	}
5419
5420	/** @copydoc VBOXHDDBACKEND::pfnComposeLocation */
5421	static int iscsiComposeLocation(PVDINTERFACE pConfig, char **pszLocation)
5422	{
5423	char *pszTarget = NULL;
5424	char *pszLUN = NULL;
5425	char *pszAddress = NULL;
5426	int rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetName", &pszTarget);
5427	if (RT_SUCCESS(rc))
5428	{
5429	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "LUN", &pszLUN);
5430	if (RT_SUCCESS(rc))
5431	{
5432	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetAddress", &pszAddress);
5433	if (RT_SUCCESS(rc))
5434	{
5435	if (RTStrAPrintf(pszLocation, "iscsi://%s/%s/%s",
5436	pszAddress, pszTarget, pszLUN) < 0)
5437	rc = VERR_NO_MEMORY;
5438	}
5439	}
5440	}
5441	RTMemFree(pszTarget);
5442	RTMemFree(pszLUN);
5443	RTMemFree(pszAddress);
5444	return rc;
5445	}
5446
5447	/** @copydoc VBOXHDDBACKEND::pfnComposeName */
5448	static int iscsiComposeName(PVDINTERFACE pConfig, char **pszName)
5449	{
5450	char *pszTarget = NULL;
5451	char *pszLUN = NULL;
5452	char *pszAddress = NULL;
5453	int rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetName", &pszTarget);
5454	if (RT_SUCCESS(rc))
5455	{
5456	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "LUN", &pszLUN);
5457	if (RT_SUCCESS(rc))
5458	{
5459	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetAddress", &pszAddress);
5460	if (RT_SUCCESS(rc))
5461	{
5462	/** @todo think about a nicer looking location scheme for iSCSI */
5463	if (RTStrAPrintf(pszName, "%s/%s/%s",
5464	pszAddress, pszTarget, pszLUN) < 0)
5465	rc = VERR_NO_MEMORY;
5466	}
5467	}
5468	}
5469	RTMemFree(pszTarget);
5470	RTMemFree(pszLUN);
5471	RTMemFree(pszAddress);
5472
5473	return rc;
5474	}
5475
5476
5477	VBOXHDDBACKEND g_ISCSIBackend =
5478	{
5479	/* pszBackendName */
5480	"iSCSI",
5481	/* cbSize */
5482	sizeof(VBOXHDDBACKEND),
5483	/* uBackendCaps */
5484	VD_CAP_CONFIG \| VD_CAP_TCPNET \| VD_CAP_ASYNC,
5485	/* papszFileExtensions */
5486	NULL,
5487	/* paConfigInfo */
5488	s_iscsiConfigInfo,
5489	/* hPlugin */
5490	NIL_RTLDRMOD,
5491	/* pfnCheckIfValid */
5492	iscsiCheckIfValid,
5493	/* pfnOpen */
5494	iscsiOpen,
5495	/* pfnCreate */
5496	iscsiCreate,
5497	/* pfnRename */
5498	NULL,
5499	/* pfnClose */
5500	iscsiClose,
5501	/* pfnRead */
5502	iscsiRead,
5503	/* pfnWrite */
5504	iscsiWrite,
5505	/* pfnFlush */
5506	iscsiFlush,
5507	/* pfnGetVersion */
5508	iscsiGetVersion,
5509	/* pfnGetSize */
5510	iscsiGetSize,
5511	/* pfnGetFileSize */
5512	iscsiGetFileSize,
5513	/* pfnGetPCHSGeometry */
5514	iscsiGetPCHSGeometry,
5515	/* pfnSetPCHSGeometry */
5516	iscsiSetPCHSGeometry,
5517	/* pfnGetLCHSGeometry */
5518	iscsiGetLCHSGeometry,
5519	/* pfnSetLCHSGeometry */
5520	iscsiSetLCHSGeometry,
5521	/* pfnGetImageFlags */
5522	iscsiGetImageFlags,
5523	/* pfnGetOpenFlags */
5524	iscsiGetOpenFlags,
5525	/* pfnSetOpenFlags */
5526	iscsiSetOpenFlags,
5527	/* pfnGetComment */
5528	iscsiGetComment,
5529	/* pfnSetComment */
5530	iscsiSetComment,
5531	/* pfnGetUuid */
5532	iscsiGetUuid,
5533	/* pfnSetUuid */
5534	iscsiSetUuid,
5535	/* pfnGetModificationUuid */
5536	iscsiGetModificationUuid,
5537	/* pfnSetModificationUuid */
5538	iscsiSetModificationUuid,
5539	/* pfnGetParentUuid */
5540	iscsiGetParentUuid,
5541	/* pfnSetParentUuid */
5542	iscsiSetParentUuid,
5543	/* pfnGetParentModificationUuid */
5544	iscsiGetParentModificationUuid,
5545	/* pfnSetParentModificationUuid */
5546	iscsiSetParentModificationUuid,
5547	/* pfnDump */
5548	iscsiDump,
5549	/* pfnGetTimeStamp */
5550	NULL,
5551	/* pfnGetParentTimeStamp */
5552	NULL,
5553	/* pfnSetParentTimeStamp */
5554	NULL,
5555	/* pfnGetParentFilename */
5556	NULL,
5557	/* pfnSetParentFilename */
5558	NULL,
5559	/* pfnAsyncRead */
5560	iscsiAsyncRead,
5561	/* pfnAsyncWrite */
5562	iscsiAsyncWrite,
5563	/* pfnAsyncFlush */
5564	iscsiAsyncFlush,
5565	/* pfnComposeLocation */
5566	iscsiComposeLocation,
5567	/* pfnComposeName */
5568	iscsiComposeName,
5569	/* pfnCompact */
5570	NULL,
5571	/* pfnResize */
5572	NULL,
5573	/* pfnDiscard */
5574	NULL
5575	};

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source: vbox/trunk/src/VBox/Storage/ISCSI.cpp@ 38621

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