iPXE
iscsi.c
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1 /*
2  * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation; either version 2 of the
7  * License, or any later version.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301, USA.
18  *
19  * You can also choose to distribute this program under the terms of
20  * the Unmodified Binary Distribution Licence (as given in the file
21  * COPYING.UBDL), provided that you have satisfied its requirements.
22  */
23 
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25 
26 #include <stddef.h>
27 #include <string.h>
28 #include <stdlib.h>
29 #include <stdio.h>
30 #include <ctype.h>
31 #include <errno.h>
32 #include <assert.h>
33 #include <byteswap.h>
34 #include <ipxe/vsprintf.h>
35 #include <ipxe/socket.h>
36 #include <ipxe/iobuf.h>
37 #include <ipxe/uri.h>
38 #include <ipxe/xfer.h>
39 #include <ipxe/open.h>
40 #include <ipxe/scsi.h>
41 #include <ipxe/process.h>
42 #include <ipxe/uaccess.h>
43 #include <ipxe/tcpip.h>
44 #include <ipxe/settings.h>
45 #include <ipxe/features.h>
46 #include <ipxe/base16.h>
47 #include <ipxe/base64.h>
48 #include <ipxe/ibft.h>
49 #include <ipxe/blockdev.h>
50 #include <ipxe/efi/efi_path.h>
51 #include <ipxe/iscsi.h>
52 
53 /** @file
54  *
55  * iSCSI protocol
56  *
57  */
58 
60 
61 /* Disambiguate the various error causes */
62 #define EACCES_INCORRECT_TARGET_USERNAME \
63  __einfo_error ( EINFO_EACCES_INCORRECT_TARGET_USERNAME )
64 #define EINFO_EACCES_INCORRECT_TARGET_USERNAME \
65  __einfo_uniqify ( EINFO_EACCES, 0x01, "Incorrect target username" )
66 #define EACCES_INCORRECT_TARGET_PASSWORD \
67  __einfo_error ( EINFO_EACCES_INCORRECT_TARGET_PASSWORD )
68 #define EINFO_EACCES_INCORRECT_TARGET_PASSWORD \
69  __einfo_uniqify ( EINFO_EACCES, 0x02, "Incorrect target password" )
70 #define EINVAL_ROOT_PATH_TOO_SHORT \
71  __einfo_error ( EINFO_EINVAL_ROOT_PATH_TOO_SHORT )
72 #define EINFO_EINVAL_ROOT_PATH_TOO_SHORT \
73  __einfo_uniqify ( EINFO_EINVAL, 0x01, "Root path too short" )
74 #define EINVAL_BAD_CREDENTIAL_MIX \
75  __einfo_error ( EINFO_EINVAL_BAD_CREDENTIAL_MIX )
76 #define EINFO_EINVAL_BAD_CREDENTIAL_MIX \
77  __einfo_uniqify ( EINFO_EINVAL, 0x02, "Bad credential mix" )
78 #define EINVAL_NO_ROOT_PATH \
79  __einfo_error ( EINFO_EINVAL_NO_ROOT_PATH )
80 #define EINFO_EINVAL_NO_ROOT_PATH \
81  __einfo_uniqify ( EINFO_EINVAL, 0x03, "No root path" )
82 #define EINVAL_NO_TARGET_IQN \
83  __einfo_error ( EINFO_EINVAL_NO_TARGET_IQN )
84 #define EINFO_EINVAL_NO_TARGET_IQN \
85  __einfo_uniqify ( EINFO_EINVAL, 0x04, "No target IQN" )
86 #define EINVAL_NO_INITIATOR_IQN \
87  __einfo_error ( EINFO_EINVAL_NO_INITIATOR_IQN )
88 #define EINFO_EINVAL_NO_INITIATOR_IQN \
89  __einfo_uniqify ( EINFO_EINVAL, 0x05, "No initiator IQN" )
90 #define EINVAL_MAXBURSTLENGTH \
91  __einfo_error ( EINFO_EINVAL_MAXBURSTLENGTH )
92 #define EINFO_EINVAL_MAXBURSTLENGTH \
93  __einfo_uniqify ( EINFO_EINVAL, 0x06, "Invalid MaxBurstLength" )
94 #define EIO_TARGET_UNAVAILABLE \
95  __einfo_error ( EINFO_EIO_TARGET_UNAVAILABLE )
96 #define EINFO_EIO_TARGET_UNAVAILABLE \
97  __einfo_uniqify ( EINFO_EIO, 0x01, "Target not currently operational" )
98 #define EIO_TARGET_NO_RESOURCES \
99  __einfo_error ( EINFO_EIO_TARGET_NO_RESOURCES )
100 #define EINFO_EIO_TARGET_NO_RESOURCES \
101  __einfo_uniqify ( EINFO_EIO, 0x02, "Target out of resources" )
102 #define ENOTSUP_INITIATOR_STATUS \
103  __einfo_error ( EINFO_ENOTSUP_INITIATOR_STATUS )
104 #define EINFO_ENOTSUP_INITIATOR_STATUS \
105  __einfo_uniqify ( EINFO_ENOTSUP, 0x01, "Unsupported initiator status" )
106 #define ENOTSUP_OPCODE \
107  __einfo_error ( EINFO_ENOTSUP_OPCODE )
108 #define EINFO_ENOTSUP_OPCODE \
109  __einfo_uniqify ( EINFO_ENOTSUP, 0x02, "Unsupported opcode" )
110 #define ENOTSUP_DISCOVERY \
111  __einfo_error ( EINFO_ENOTSUP_DISCOVERY )
112 #define EINFO_ENOTSUP_DISCOVERY \
113  __einfo_uniqify ( EINFO_ENOTSUP, 0x03, "Discovery not supported" )
114 #define ENOTSUP_TARGET_STATUS \
115  __einfo_error ( EINFO_ENOTSUP_TARGET_STATUS )
116 #define EINFO_ENOTSUP_TARGET_STATUS \
117  __einfo_uniqify ( EINFO_ENOTSUP, 0x04, "Unsupported target status" )
118 #define EPERM_INITIATOR_AUTHENTICATION \
119  __einfo_error ( EINFO_EPERM_INITIATOR_AUTHENTICATION )
120 #define EINFO_EPERM_INITIATOR_AUTHENTICATION \
121  __einfo_uniqify ( EINFO_EPERM, 0x01, "Initiator authentication failed" )
122 #define EPERM_INITIATOR_AUTHORISATION \
123  __einfo_error ( EINFO_EPERM_INITIATOR_AUTHORISATION )
124 #define EINFO_EPERM_INITIATOR_AUTHORISATION \
125  __einfo_uniqify ( EINFO_EPERM, 0x02, "Initiator not authorised" )
126 #define EPROTO_INVALID_CHAP_ALGORITHM \
127  __einfo_error ( EINFO_EPROTO_INVALID_CHAP_ALGORITHM )
128 #define EINFO_EPROTO_INVALID_CHAP_ALGORITHM \
129  __einfo_uniqify ( EINFO_EPROTO, 0x01, "Invalid CHAP algorithm" )
130 #define EPROTO_INVALID_CHAP_IDENTIFIER \
131  __einfo_error ( EINFO_EPROTO_INVALID_CHAP_IDENTIFIER )
132 #define EINFO_EPROTO_INVALID_CHAP_IDENTIFIER \
133  __einfo_uniqify ( EINFO_EPROTO, 0x02, "Invalid CHAP identifier" )
134 #define EPROTO_INVALID_LARGE_BINARY \
135  __einfo_error ( EINFO_EPROTO_INVALID_LARGE_BINARY )
136 #define EINFO_EPROTO_INVALID_LARGE_BINARY \
137  __einfo_uniqify ( EINFO_EPROTO, 0x03, "Invalid large binary value" )
138 #define EPROTO_INVALID_CHAP_RESPONSE \
139  __einfo_error ( EINFO_EPROTO_INVALID_CHAP_RESPONSE )
140 #define EINFO_EPROTO_INVALID_CHAP_RESPONSE \
141  __einfo_uniqify ( EINFO_EPROTO, 0x04, "Invalid CHAP response" )
142 #define EPROTO_INVALID_KEY_VALUE_PAIR \
143  __einfo_error ( EINFO_EPROTO_INVALID_KEY_VALUE_PAIR )
144 #define EINFO_EPROTO_INVALID_KEY_VALUE_PAIR \
145  __einfo_uniqify ( EINFO_EPROTO, 0x05, "Invalid key/value pair" )
146 #define EPROTO_VALUE_REJECTED \
147  __einfo_error ( EINFO_EPROTO_VALUE_REJECTED )
148 #define EINFO_EPROTO_VALUE_REJECTED \
149  __einfo_uniqify ( EINFO_EPROTO, 0x06, "Parameter rejected" )
150 
151 static void iscsi_start_tx ( struct iscsi_session *iscsi );
152 static void iscsi_start_login ( struct iscsi_session *iscsi );
153 static void iscsi_start_data_out ( struct iscsi_session *iscsi,
154  unsigned int datasn );
155 
156 /**
157  * Finish receiving PDU data into buffer
158  *
159  * @v iscsi iSCSI session
160  */
161 static void iscsi_rx_buffered_data_done ( struct iscsi_session *iscsi ) {
162  free ( iscsi->rx_buffer );
163  iscsi->rx_buffer = NULL;
164 }
165 
166 /**
167  * Receive PDU data into buffer
168  *
169  * @v iscsi iSCSI session
170  * @v data Data to receive
171  * @v len Length of data
172  * @ret rc Return status code
173  *
174  * This can be used when the RX PDU type handler wishes to buffer up
175  * all received data and process the PDU as a single unit. The caller
176  * is repsonsible for calling iscsi_rx_buffered_data_done() after
177  * processing the data.
178  */
179 static int iscsi_rx_buffered_data ( struct iscsi_session *iscsi,
180  const void *data, size_t len ) {
181 
182  /* Allocate buffer on first call */
183  if ( ! iscsi->rx_buffer ) {
184  iscsi->rx_buffer = malloc ( iscsi->rx_len );
185  if ( ! iscsi->rx_buffer )
186  return -ENOMEM;
187  }
188 
189  /* Copy data to buffer */
190  assert ( ( iscsi->rx_offset + len ) <= iscsi->rx_len );
191  memcpy ( ( iscsi->rx_buffer + iscsi->rx_offset ), data, len );
192 
193  return 0;
194 }
195 
196 /**
197  * Free iSCSI session
198  *
199  * @v refcnt Reference counter
200  */
201 static void iscsi_free ( struct refcnt *refcnt ) {
202  struct iscsi_session *iscsi =
204 
205  free ( iscsi->initiator_iqn );
206  free ( iscsi->target_address );
207  free ( iscsi->target_iqn );
208  free ( iscsi->initiator_username );
209  free ( iscsi->initiator_password );
210  free ( iscsi->target_username );
211  free ( iscsi->target_password );
212  chap_finish ( &iscsi->chap );
213  iscsi_rx_buffered_data_done ( iscsi );
214  free ( iscsi->command );
215  free ( iscsi );
216 }
217 
218 /**
219  * Shut down iSCSI interface
220  *
221  * @v iscsi iSCSI session
222  * @v rc Reason for close
223  */
224 static void iscsi_close ( struct iscsi_session *iscsi, int rc ) {
225 
226  /* A TCP graceful close is still an error from our point of view */
227  if ( rc == 0 )
228  rc = -ECONNRESET;
229 
230  DBGC ( iscsi, "iSCSI %p closed: %s\n", iscsi, strerror ( rc ) );
231 
232  /* Stop transmission process */
233  process_del ( &iscsi->process );
234 
235  /* Shut down interfaces */
236  intfs_shutdown ( rc, &iscsi->socket, &iscsi->control, &iscsi->data,
237  NULL );
238 }
239 
240 /**
241  * Assign new iSCSI initiator task tag
242  *
243  * @v iscsi iSCSI session
244  */
245 static void iscsi_new_itt ( struct iscsi_session *iscsi ) {
246  static uint16_t itt_idx;
247 
248  iscsi->itt = ( ISCSI_TAG_MAGIC | (++itt_idx) );
249 }
250 
251 /**
252  * Open iSCSI transport-layer connection
253  *
254  * @v iscsi iSCSI session
255  * @ret rc Return status code
256  */
257 static int iscsi_open_connection ( struct iscsi_session *iscsi ) {
258  struct sockaddr_tcpip target;
259  int rc;
260 
261  assert ( iscsi->tx_state == ISCSI_TX_IDLE );
262  assert ( iscsi->rx_state == ISCSI_RX_BHS );
263  assert ( iscsi->rx_offset == 0 );
264 
265  /* Open socket */
266  memset ( &target, 0, sizeof ( target ) );
267  target.st_port = htons ( iscsi->target_port );
268  if ( ( rc = xfer_open_named_socket ( &iscsi->socket, SOCK_STREAM,
269  ( struct sockaddr * ) &target,
270  iscsi->target_address,
271  NULL ) ) != 0 ) {
272  DBGC ( iscsi, "iSCSI %p could not open socket: %s\n",
273  iscsi, strerror ( rc ) );
274  return rc;
275  }
276 
277  /* Enter security negotiation phase */
280  if ( iscsi->target_username )
282 
283  /* Assign new ISID */
284  iscsi->isid_iana_qual = ( random() & 0xffff );
285 
286  /* Assign fresh initiator task tag */
287  iscsi_new_itt ( iscsi );
288 
289  /* Set default operational parameters */
291 
292  /* Initiate login */
293  iscsi_start_login ( iscsi );
294 
295  return 0;
296 }
297 
298 /**
299  * Close iSCSI transport-layer connection
300  *
301  * @v iscsi iSCSI session
302  * @v rc Reason for close
303  *
304  * Closes the transport-layer connection and resets the session state
305  * ready to attempt a fresh login.
306  */
307 static void iscsi_close_connection ( struct iscsi_session *iscsi, int rc ) {
308 
309  /* Close all data transfer interfaces */
310  intf_restart ( &iscsi->socket, rc );
311 
312  /* Clear connection status */
313  iscsi->status = 0;
314 
315  /* Reset TX and RX state machines */
316  iscsi->tx_state = ISCSI_TX_IDLE;
317  iscsi->rx_state = ISCSI_RX_BHS;
318  iscsi->rx_offset = 0;
319 
320  /* Free any temporary dynamically allocated memory */
321  chap_finish ( &iscsi->chap );
322  iscsi_rx_buffered_data_done ( iscsi );
323 }
324 
325 /**
326  * Mark iSCSI SCSI operation as complete
327  *
328  * @v iscsi iSCSI session
329  * @v rc Return status code
330  * @v rsp SCSI response, if any
331  *
332  * Note that iscsi_scsi_done() will not close the connection, and must
333  * therefore be called only when the internal state machines are in an
334  * appropriate state, otherwise bad things may happen on the next call
335  * to iscsi_scsi_command(). The general rule is to call
336  * iscsi_scsi_done() only at the end of receiving a PDU; at this point
337  * the TX and RX engines should both be idle.
338  */
339 static void iscsi_scsi_done ( struct iscsi_session *iscsi, int rc,
340  struct scsi_rsp *rsp ) {
341  uint32_t itt = iscsi->itt;
342 
343  assert ( iscsi->tx_state == ISCSI_TX_IDLE );
344 
345  /* Clear command */
346  free ( iscsi->command );
347  iscsi->command = NULL;
348 
349  /* Send SCSI response, if any */
350  if ( rsp )
351  scsi_response ( &iscsi->data, rsp );
352 
353  /* Close SCSI command, if this is still the same command. (It
354  * is possible that the command interface has already been
355  * closed as a result of the SCSI response we sent.)
356  */
357  if ( iscsi->itt == itt )
358  intf_restart ( &iscsi->data, rc );
359 }
360 
361 /****************************************************************************
362  *
363  * iSCSI SCSI command issuing
364  *
365  */
366 
367 /**
368  * Build iSCSI SCSI command BHS
369  *
370  * @v iscsi iSCSI session
371  *
372  * We don't currently support bidirectional commands (i.e. with both
373  * Data-In and Data-Out segments); these would require providing code
374  * to generate an AHS, and there doesn't seem to be any need for it at
375  * the moment.
376  */
377 static void iscsi_start_command ( struct iscsi_session *iscsi ) {
379 
380  assert ( ! ( iscsi->command->data_in && iscsi->command->data_out ) );
381 
382  /* Construct BHS and initiate transmission */
383  iscsi_start_tx ( iscsi );
385  command->flags = ( ISCSI_FLAG_FINAL |
387  if ( iscsi->command->data_in )
389  if ( iscsi->command->data_out )
391  /* lengths left as zero */
392  memcpy ( &command->lun, &iscsi->command->lun,
393  sizeof ( command->lun ) );
394  command->itt = htonl ( iscsi->itt );
395  command->exp_len = htonl ( iscsi->command->data_in_len |
396  iscsi->command->data_out_len );
397  command->cmdsn = htonl ( iscsi->cmdsn );
398  command->expstatsn = htonl ( iscsi->statsn + 1 );
399  memcpy ( &command->cdb, &iscsi->command->cdb, sizeof ( command->cdb ));
400  DBGC2 ( iscsi, "iSCSI %p start " SCSI_CDB_FORMAT " %s %#zx\n",
401  iscsi, SCSI_CDB_DATA ( command->cdb ),
402  ( iscsi->command->data_in ? "in" : "out" ),
403  ( iscsi->command->data_in ?
404  iscsi->command->data_in_len :
405  iscsi->command->data_out_len ) );
406 }
407 
408 /**
409  * Receive data segment of an iSCSI SCSI response PDU
410  *
411  * @v iscsi iSCSI session
412  * @v data Received data
413  * @v len Length of received data
414  * @v remaining Data remaining after this data
415  * @ret rc Return status code
416  */
417 static int iscsi_rx_scsi_response ( struct iscsi_session *iscsi,
418  const void *data, size_t len,
419  size_t remaining ) {
421  = &iscsi->rx_bhs.scsi_response;
422  struct scsi_rsp rsp;
423  uint32_t residual_count;
424  size_t data_len;
425  int rc;
426 
427  /* Buffer up the PDU data */
428  if ( ( rc = iscsi_rx_buffered_data ( iscsi, data, len ) ) != 0 ) {
429  DBGC ( iscsi, "iSCSI %p could not buffer SCSI response: %s\n",
430  iscsi, strerror ( rc ) );
431  return rc;
432  }
433  if ( remaining )
434  return 0;
435 
436  /* Parse SCSI response and discard buffer */
437  memset ( &rsp, 0, sizeof ( rsp ) );
438  rsp.status = response->status;
439  residual_count = ntohl ( response->residual_count );
440  if ( response->flags & ISCSI_DATA_FLAG_OVERFLOW ) {
441  rsp.overrun = residual_count;
442  } else if ( response->flags & ISCSI_DATA_FLAG_UNDERFLOW ) {
443  rsp.overrun = -(residual_count);
444  }
445  data_len = ISCSI_DATA_LEN ( response->lengths );
446  if ( data_len ) {
447  scsi_parse_sense ( ( iscsi->rx_buffer + 2 ), ( data_len - 2 ),
448  &rsp.sense );
449  }
450  iscsi_rx_buffered_data_done ( iscsi );
451 
452  /* Check for errors */
453  if ( response->response != ISCSI_RESPONSE_COMMAND_COMPLETE )
454  return -EIO;
455 
456  /* Mark as completed */
457  iscsi_scsi_done ( iscsi, 0, &rsp );
458  return 0;
459 }
460 
461 /**
462  * Receive data segment of an iSCSI data-in PDU
463  *
464  * @v iscsi iSCSI session
465  * @v data Received data
466  * @v len Length of received data
467  * @v remaining Data remaining after this data
468  * @ret rc Return status code
469  */
470 static int iscsi_rx_data_in ( struct iscsi_session *iscsi,
471  const void *data, size_t len,
472  size_t remaining ) {
473  struct iscsi_bhs_data_in *data_in = &iscsi->rx_bhs.data_in;
474  unsigned long offset;
475 
476  /* Copy data to data-in buffer */
477  offset = ntohl ( data_in->offset ) + iscsi->rx_offset;
478  assert ( iscsi->command != NULL );
479  assert ( iscsi->command->data_in );
480  assert ( ( offset + len ) <= iscsi->command->data_in_len );
481  copy_to_user ( iscsi->command->data_in, offset, data, len );
482 
483  /* Wait for whole SCSI response to arrive */
484  if ( remaining )
485  return 0;
486 
487  /* Mark as completed if status is present */
488  if ( data_in->flags & ISCSI_DATA_FLAG_STATUS ) {
489  assert ( ( offset + len ) == iscsi->command->data_in_len );
490  assert ( data_in->flags & ISCSI_FLAG_FINAL );
491  /* iSCSI cannot return an error status via a data-in */
492  iscsi_scsi_done ( iscsi, 0, NULL );
493  }
494 
495  return 0;
496 }
497 
498 /**
499  * Receive data segment of an iSCSI R2T PDU
500  *
501  * @v iscsi iSCSI session
502  * @v data Received data
503  * @v len Length of received data
504  * @v remaining Data remaining after this data
505  * @ret rc Return status code
506  */
507 static int iscsi_rx_r2t ( struct iscsi_session *iscsi,
508  const void *data __unused, size_t len __unused,
509  size_t remaining __unused ) {
510  struct iscsi_bhs_r2t *r2t = &iscsi->rx_bhs.r2t;
511 
512  /* Record transfer parameters and trigger first data-out */
513  iscsi->ttt = ntohl ( r2t->ttt );
514  iscsi->transfer_offset = ntohl ( r2t->offset );
515  iscsi->transfer_len = ntohl ( r2t->len );
516  iscsi_start_data_out ( iscsi, 0 );
517 
518  return 0;
519 }
520 
521 /**
522  * Build iSCSI data-out BHS
523  *
524  * @v iscsi iSCSI session
525  * @v datasn Data sequence number within the transfer
526  *
527  */
528 static void iscsi_start_data_out ( struct iscsi_session *iscsi,
529  unsigned int datasn ) {
530  struct iscsi_bhs_data_out *data_out = &iscsi->tx_bhs.data_out;
531  unsigned long offset;
532  unsigned long remaining;
533  unsigned long len;
534 
535  /* We always send 512-byte Data-Out PDUs; this removes the
536  * need to worry about the target's MaxRecvDataSegmentLength.
537  */
538  offset = datasn * 512;
539  remaining = iscsi->transfer_len - offset;
540  len = remaining;
541  if ( len > 512 )
542  len = 512;
543 
544  /* Construct BHS and initiate transmission */
545  iscsi_start_tx ( iscsi );
546  data_out->opcode = ISCSI_OPCODE_DATA_OUT;
547  if ( len == remaining )
548  data_out->flags = ( ISCSI_FLAG_FINAL );
549  ISCSI_SET_LENGTHS ( data_out->lengths, 0, len );
550  data_out->lun = iscsi->command->lun;
551  data_out->itt = htonl ( iscsi->itt );
552  data_out->ttt = htonl ( iscsi->ttt );
553  data_out->expstatsn = htonl ( iscsi->statsn + 1 );
554  data_out->datasn = htonl ( datasn );
555  data_out->offset = htonl ( iscsi->transfer_offset + offset );
556  DBGC ( iscsi, "iSCSI %p start data out DataSN %#x len %#lx\n",
557  iscsi, datasn, len );
558 }
559 
560 /**
561  * Complete iSCSI data-out PDU transmission
562  *
563  * @v iscsi iSCSI session
564  *
565  */
566 static void iscsi_data_out_done ( struct iscsi_session *iscsi ) {
567  struct iscsi_bhs_data_out *data_out = &iscsi->tx_bhs.data_out;
568 
569  /* If we haven't reached the end of the sequence, start
570  * sending the next data-out PDU.
571  */
572  if ( ! ( data_out->flags & ISCSI_FLAG_FINAL ) )
573  iscsi_start_data_out ( iscsi, ntohl ( data_out->datasn ) + 1 );
574 }
575 
576 /**
577  * Send iSCSI data-out data segment
578  *
579  * @v iscsi iSCSI session
580  * @ret rc Return status code
581  */
582 static int iscsi_tx_data_out ( struct iscsi_session *iscsi ) {
583  struct iscsi_bhs_data_out *data_out = &iscsi->tx_bhs.data_out;
584  struct io_buffer *iobuf;
585  unsigned long offset;
586  size_t len;
587  size_t pad_len;
588 
589  offset = ntohl ( data_out->offset );
590  len = ISCSI_DATA_LEN ( data_out->lengths );
591  pad_len = ISCSI_DATA_PAD_LEN ( data_out->lengths );
592 
593  assert ( iscsi->command != NULL );
594  assert ( iscsi->command->data_out );
595  assert ( ( offset + len ) <= iscsi->command->data_out_len );
596 
597  iobuf = xfer_alloc_iob ( &iscsi->socket, ( len + pad_len ) );
598  if ( ! iobuf )
599  return -ENOMEM;
600 
601  copy_from_user ( iob_put ( iobuf, len ),
602  iscsi->command->data_out, offset, len );
603  memset ( iob_put ( iobuf, pad_len ), 0, pad_len );
604 
605  return xfer_deliver_iob ( &iscsi->socket, iobuf );
606 }
607 
608 /**
609  * Receive data segment of an iSCSI NOP-In
610  *
611  * @v iscsi iSCSI session
612  * @v data Received data
613  * @v len Length of received data
614  * @v remaining Data remaining after this data
615  * @ret rc Return status code
616  */
617 static int iscsi_rx_nop_in ( struct iscsi_session *iscsi,
618  const void *data __unused, size_t len __unused,
619  size_t remaining __unused ) {
620  struct iscsi_nop_in *nop_in = &iscsi->rx_bhs.nop_in;
621 
622  DBGC2 ( iscsi, "iSCSI %p received NOP-In\n", iscsi );
623 
624  /* We don't currently have the ability to respond to NOP-Ins
625  * sent as ping requests, but we can happily accept NOP-Ins
626  * sent merely to update CmdSN.
627  */
628  if ( nop_in->ttt == htonl ( ISCSI_TAG_RESERVED ) )
629  return 0;
630 
631  /* Ignore any other NOP-Ins. The target may eventually
632  * disconnect us for failing to respond, but this minimises
633  * unnecessary connection closures.
634  */
635  DBGC ( iscsi, "iSCSI %p received unsupported NOP-In with TTT %08x\n",
636  iscsi, ntohl ( nop_in->ttt ) );
637  return 0;
638 }
639 
640 /****************************************************************************
641  *
642  * iSCSI login
643  *
644  */
645 
646 /**
647  * Build iSCSI login request strings
648  *
649  * @v iscsi iSCSI session
650  *
651  * These are the initial set of strings sent in the first login
652  * request PDU. We want the following settings:
653  *
654  * HeaderDigest=None
655  * DataDigest=None
656  * MaxConnections=1 (irrelevant; we make only one connection anyway) [4]
657  * InitialR2T=Yes [1]
658  * ImmediateData=No (irrelevant; we never send immediate data) [4]
659  * MaxRecvDataSegmentLength=8192 (default; we don't care) [3]
660  * MaxBurstLength=262144 (default; we don't care) [3]
661  * FirstBurstLength=65536 (irrelevant due to other settings) [5]
662  * DefaultTime2Wait=0 [2]
663  * DefaultTime2Retain=0 [2]
664  * MaxOutstandingR2T=1
665  * DataPDUInOrder=Yes
666  * DataSequenceInOrder=Yes
667  * ErrorRecoveryLevel=0
668  *
669  * [1] InitialR2T has an OR resolution function, so the target may
670  * force us to use it. We therefore simplify our logic by always
671  * using it.
672  *
673  * [2] These ensure that we can safely start a new task once we have
674  * reconnected after a failure, without having to manually tidy up
675  * after the old one.
676  *
677  * [3] We are quite happy to use the RFC-defined default values for
678  * these parameters, but some targets (notably OpenSolaris)
679  * incorrectly assume a default value of zero, so we explicitly
680  * specify the default values.
681  *
682  * [4] We are quite happy to use the RFC-defined default values for
683  * these parameters, but some targets (notably a QNAP TS-639Pro) fail
684  * unless they are supplied, so we explicitly specify the default
685  * values.
686  *
687  * [5] FirstBurstLength is defined to be irrelevant since we already
688  * force InitialR2T=Yes and ImmediateData=No, but some targets
689  * (notably LIO as of kernel 4.11) fail unless it is specified, so we
690  * explicitly specify the default value.
691  */
693  void *data, size_t len ) {
694  unsigned int used = 0;
695  const char *auth_method;
696 
697  if ( iscsi->status & ISCSI_STATUS_STRINGS_SECURITY ) {
698  /* Default to allowing no authentication */
699  auth_method = "None";
700  /* If we have a credential to supply, permit CHAP */
701  if ( iscsi->initiator_username )
702  auth_method = "CHAP,None";
703  /* If we have a credential to check, force CHAP */
704  if ( iscsi->target_username )
705  auth_method = "CHAP";
706  used += ssnprintf ( data + used, len - used,
707  "InitiatorName=%s%c"
708  "TargetName=%s%c"
709  "SessionType=Normal%c"
710  "AuthMethod=%s%c",
711  iscsi->initiator_iqn, 0,
712  iscsi->target_iqn, 0, 0,
713  auth_method, 0 );
714  }
715 
717  used += ssnprintf ( data + used, len - used, "CHAP_A=5%c", 0 );
718  }
719 
720  if ( ( iscsi->status & ISCSI_STATUS_STRINGS_CHAP_RESPONSE ) ) {
721  char buf[ base16_encoded_len ( iscsi->chap.response_len ) + 1 ];
722  assert ( iscsi->initiator_username != NULL );
723  base16_encode ( iscsi->chap.response, iscsi->chap.response_len,
724  buf, sizeof ( buf ) );
725  used += ssnprintf ( data + used, len - used,
726  "CHAP_N=%s%cCHAP_R=0x%s%c",
727  iscsi->initiator_username, 0, buf, 0 );
728  }
729 
730  if ( ( iscsi->status & ISCSI_STATUS_STRINGS_CHAP_CHALLENGE ) ) {
731  size_t challenge_len = ( sizeof ( iscsi->chap_challenge ) - 1 );
732  char buf[ base16_encoded_len ( challenge_len ) + 1 ];
733  base16_encode ( ( iscsi->chap_challenge + 1 ), challenge_len,
734  buf, sizeof ( buf ) );
735  used += ssnprintf ( data + used, len - used,
736  "CHAP_I=%d%cCHAP_C=0x%s%c",
737  iscsi->chap_challenge[0], 0, buf, 0 );
738  }
739 
740  if ( iscsi->status & ISCSI_STATUS_STRINGS_OPERATIONAL ) {
741  used += ssnprintf ( data + used, len - used,
742  "HeaderDigest=None%c"
743  "DataDigest=None%c"
744  "MaxConnections=1%c"
745  "InitialR2T=Yes%c"
746  "ImmediateData=No%c"
747  "MaxRecvDataSegmentLength=%d%c"
748  "MaxBurstLength=%d%c"
749  "FirstBurstLength=%d%c"
750  "DefaultTime2Wait=0%c"
751  "DefaultTime2Retain=0%c"
752  "MaxOutstandingR2T=1%c"
753  "DataPDUInOrder=Yes%c"
754  "DataSequenceInOrder=Yes%c"
755  "ErrorRecoveryLevel=0%c",
756  0, 0, 0, 0, 0,
760  0, 0, 0, 0, 0, 0 );
761  }
762 
763  return used;
764 }
765 
766 /**
767  * Build iSCSI login request BHS
768  *
769  * @v iscsi iSCSI session
770  */
771 static void iscsi_start_login ( struct iscsi_session *iscsi ) {
773  int len;
774 
775  switch ( iscsi->status & ISCSI_LOGIN_CSG_MASK ) {
777  DBGC ( iscsi, "iSCSI %p entering security negotiation\n",
778  iscsi );
779  break;
781  DBGC ( iscsi, "iSCSI %p entering operational negotiation\n",
782  iscsi );
783  break;
784  default:
785  assert ( 0 );
786  }
787 
788  /* Construct BHS and initiate transmission */
789  iscsi_start_tx ( iscsi );
790  request->opcode = ( ISCSI_OPCODE_LOGIN_REQUEST |
792  request->flags = ( ( iscsi->status & ISCSI_STATUS_PHASE_MASK ) |
794  /* version_max and version_min left as zero */
796  ISCSI_SET_LENGTHS ( request->lengths, 0, len );
797  request->isid_iana_en = htonl ( ISCSI_ISID_IANA |
799  request->isid_iana_qual = htons ( iscsi->isid_iana_qual );
800  /* tsih left as zero */
801  request->itt = htonl ( iscsi->itt );
802  /* cid left as zero */
803  request->cmdsn = htonl ( iscsi->cmdsn );
804  request->expstatsn = htonl ( iscsi->statsn + 1 );
805 }
806 
807 /**
808  * Complete iSCSI login request PDU transmission
809  *
810  * @v iscsi iSCSI session
811  *
812  */
813 static void iscsi_login_request_done ( struct iscsi_session *iscsi ) {
814 
815  /* Clear any "strings to send" flags */
817 
818  /* Free any dynamically allocated storage used for login */
819  chap_finish ( &iscsi->chap );
820 }
821 
822 /**
823  * Transmit data segment of an iSCSI login request PDU
824  *
825  * @v iscsi iSCSI session
826  * @ret rc Return status code
827  *
828  * For login requests, the data segment consists of the login strings.
829  */
830 static int iscsi_tx_login_request ( struct iscsi_session *iscsi ) {
832  struct io_buffer *iobuf;
833  size_t len;
834  size_t pad_len;
835 
836  len = ISCSI_DATA_LEN ( request->lengths );
837  pad_len = ISCSI_DATA_PAD_LEN ( request->lengths );
838  iobuf = xfer_alloc_iob ( &iscsi->socket, ( len + pad_len ) );
839  if ( ! iobuf )
840  return -ENOMEM;
841  iob_put ( iobuf, len );
842  iscsi_build_login_request_strings ( iscsi, iobuf->data, len );
843  memset ( iob_put ( iobuf, pad_len ), 0, pad_len );
844 
845  return xfer_deliver_iob ( &iscsi->socket, iobuf );
846 }
847 
848 /**
849  * Decode large binary value
850  *
851  * @v encoded Encoded large binary value
852  * @v raw Raw data
853  * @v len Length of data buffer
854  * @ret len Length of raw data, or negative error
855  */
856 static int iscsi_large_binary_decode ( const char *encoded, uint8_t *raw,
857  size_t len ) {
858 
859  /* Check for initial '0x' or '0b' and decode as appropriate */
860  if ( *(encoded++) == '0' ) {
861  switch ( tolower ( *(encoded++) ) ) {
862  case 'x' :
863  return base16_decode ( encoded, raw, len );
864  case 'b' :
865  return base64_decode ( encoded, raw, len );
866  }
867  }
868 
870 }
871 
872 /**
873  * Handle iSCSI TargetAddress text value
874  *
875  * @v iscsi iSCSI session
876  * @v value TargetAddress value
877  * @ret rc Return status code
878  */
880  const char *value ) {
881  char *separator;
882 
883  DBGC ( iscsi, "iSCSI %p will redirect to %s\n", iscsi, value );
884 
885  /* Replace target address */
886  free ( iscsi->target_address );
887  iscsi->target_address = strdup ( value );
888  if ( ! iscsi->target_address )
889  return -ENOMEM;
890 
891  /* Replace target port */
892  iscsi->target_port = htons ( ISCSI_PORT );
893  separator = strchr ( iscsi->target_address, ':' );
894  if ( separator ) {
895  *separator = '\0';
896  iscsi->target_port = strtoul ( ( separator + 1 ), NULL, 0 );
897  }
898 
899  return 0;
900 }
901 
902 /**
903  * Handle iSCSI AuthMethod text value
904  *
905  * @v iscsi iSCSI session
906  * @v value AuthMethod value
907  * @ret rc Return status code
908  */
909 static int iscsi_handle_authmethod_value ( struct iscsi_session *iscsi,
910  const char *value ) {
911 
912  /* If server requests CHAP, send the CHAP_A string */
913  if ( strcmp ( value, "CHAP" ) == 0 ) {
914  DBGC ( iscsi, "iSCSI %p initiating CHAP authentication\n",
915  iscsi );
918  }
919 
920  return 0;
921 }
922 
923 /**
924  * Handle iSCSI MaxBurstLength text value
925  *
926  * @v iscsi iSCSI session
927  * @v value MaxBurstLength value
928  * @ret rc Return status code
929  */
931  const char *value ) {
932  unsigned long max_burst_len;
933  char *end;
934 
935  /* Update maximum burst length */
936  max_burst_len = strtoul ( value, &end, 0 );
937  if ( *end ) {
938  DBGC ( iscsi, "iSCSI %p invalid MaxBurstLength \"%s\"\n",
939  iscsi, value );
940  return -EINVAL_MAXBURSTLENGTH;
941  }
942  if ( max_burst_len < iscsi->max_burst_len )
943  iscsi->max_burst_len = max_burst_len;
944 
945  return 0;
946 }
947 
948 /**
949  * Handle iSCSI CHAP_A text value
950  *
951  * @v iscsi iSCSI session
952  * @v value CHAP_A value
953  * @ret rc Return status code
954  */
955 static int iscsi_handle_chap_a_value ( struct iscsi_session *iscsi,
956  const char *value ) {
957 
958  /* We only ever offer "5" (i.e. MD5) as an algorithm, so if
959  * the server responds with anything else it is a protocol
960  * violation.
961  */
962  if ( strcmp ( value, "5" ) != 0 ) {
963  DBGC ( iscsi, "iSCSI %p got invalid CHAP algorithm \"%s\"\n",
964  iscsi, value );
966  }
967 
968  return 0;
969 }
970 
971 /**
972  * Handle iSCSI CHAP_I text value
973  *
974  * @v iscsi iSCSI session
975  * @v value CHAP_I value
976  * @ret rc Return status code
977  */
978 static int iscsi_handle_chap_i_value ( struct iscsi_session *iscsi,
979  const char *value ) {
980  unsigned int identifier;
981  char *endp;
982  int rc;
983 
984  /* The CHAP identifier is an integer value */
985  identifier = strtoul ( value, &endp, 0 );
986  if ( *endp != '\0' ) {
987  DBGC ( iscsi, "iSCSI %p saw invalid CHAP identifier \"%s\"\n",
988  iscsi, value );
990  }
991 
992  /* Prepare for CHAP with MD5 */
993  chap_finish ( &iscsi->chap );
994  if ( ( rc = chap_init ( &iscsi->chap, &md5_algorithm ) ) != 0 ) {
995  DBGC ( iscsi, "iSCSI %p could not initialise CHAP: %s\n",
996  iscsi, strerror ( rc ) );
997  return rc;
998  }
999 
1000  /* Identifier and secret are the first two components of the
1001  * challenge.
1002  */
1003  chap_set_identifier ( &iscsi->chap, identifier );
1004  if ( iscsi->initiator_password ) {
1005  chap_update ( &iscsi->chap, iscsi->initiator_password,
1006  strlen ( iscsi->initiator_password ) );
1007  }
1008 
1009  return 0;
1010 }
1011 
1012 /**
1013  * Handle iSCSI CHAP_C text value
1014  *
1015  * @v iscsi iSCSI session
1016  * @v value CHAP_C value
1017  * @ret rc Return status code
1018  */
1019 static int iscsi_handle_chap_c_value ( struct iscsi_session *iscsi,
1020  const char *value ) {
1021  uint8_t *buf;
1022  unsigned int i;
1023  int len;
1024  int rc;
1025 
1026  /* Allocate decoding buffer */
1027  len = strlen ( value ); /* Decoding never expands data */
1028  buf = malloc ( len );
1029  if ( ! buf ) {
1030  rc = -ENOMEM;
1031  goto err_alloc;
1032  }
1033 
1034  /* Process challenge */
1035  len = iscsi_large_binary_decode ( value, buf, len );
1036  if ( len < 0 ) {
1037  rc = len;
1038  DBGC ( iscsi, "iSCSI %p invalid CHAP challenge \"%s\": %s\n",
1039  iscsi, value, strerror ( rc ) );
1040  goto err_decode;
1041  }
1042  chap_update ( &iscsi->chap, buf, len );
1043 
1044  /* Build CHAP response */
1045  DBGC ( iscsi, "iSCSI %p sending CHAP response\n", iscsi );
1046  chap_respond ( &iscsi->chap );
1048 
1049  /* Send CHAP challenge, if applicable */
1050  if ( iscsi->target_username ) {
1052  /* Generate CHAP challenge data */
1053  for ( i = 0 ; i < sizeof ( iscsi->chap_challenge ) ; i++ ) {
1054  iscsi->chap_challenge[i] = random();
1055  }
1056  }
1057 
1058  /* Success */
1059  rc = 0;
1060 
1061  err_decode:
1062  free ( buf );
1063  err_alloc:
1064  return rc;
1065 }
1066 
1067 /**
1068  * Handle iSCSI CHAP_N text value
1069  *
1070  * @v iscsi iSCSI session
1071  * @v value CHAP_N value
1072  * @ret rc Return status code
1073  */
1074 static int iscsi_handle_chap_n_value ( struct iscsi_session *iscsi,
1075  const char *value ) {
1076 
1077  /* The target username isn't actually involved at any point in
1078  * the authentication process; it merely serves to identify
1079  * which password the target is using to generate the CHAP
1080  * response. We unnecessarily verify that the username is as
1081  * expected, in order to provide mildly helpful diagnostics if
1082  * the target is supplying the wrong username/password
1083  * combination.
1084  */
1085  if ( iscsi->target_username &&
1086  ( strcmp ( iscsi->target_username, value ) != 0 ) ) {
1087  DBGC ( iscsi, "iSCSI %p target username \"%s\" incorrect "
1088  "(wanted \"%s\")\n",
1089  iscsi, value, iscsi->target_username );
1091  }
1092 
1093  return 0;
1094 }
1095 
1096 /**
1097  * Handle iSCSI CHAP_R text value
1098  *
1099  * @v iscsi iSCSI session
1100  * @v value CHAP_R value
1101  * @ret rc Return status code
1102  */
1103 static int iscsi_handle_chap_r_value ( struct iscsi_session *iscsi,
1104  const char *value ) {
1105  uint8_t *buf;
1106  int len;
1107  int rc;
1108 
1109  /* Generate CHAP response for verification */
1110  chap_finish ( &iscsi->chap );
1111  if ( ( rc = chap_init ( &iscsi->chap, &md5_algorithm ) ) != 0 ) {
1112  DBGC ( iscsi, "iSCSI %p could not initialise CHAP: %s\n",
1113  iscsi, strerror ( rc ) );
1114  goto err_chap_init;
1115  }
1116  chap_set_identifier ( &iscsi->chap, iscsi->chap_challenge[0] );
1117  if ( iscsi->target_password ) {
1118  chap_update ( &iscsi->chap, iscsi->target_password,
1119  strlen ( iscsi->target_password ) );
1120  }
1121  chap_update ( &iscsi->chap, &iscsi->chap_challenge[1],
1122  ( sizeof ( iscsi->chap_challenge ) - 1 ) );
1123  chap_respond ( &iscsi->chap );
1124 
1125  /* Allocate decoding buffer */
1126  len = strlen ( value ); /* Decoding never expands data */
1127  buf = malloc ( len );
1128  if ( ! buf ) {
1129  rc = -ENOMEM;
1130  goto err_alloc;
1131  }
1132 
1133  /* Process response */
1134  len = iscsi_large_binary_decode ( value, buf, len );
1135  if ( len < 0 ) {
1136  rc = len;
1137  DBGC ( iscsi, "iSCSI %p invalid CHAP response \"%s\": %s\n",
1138  iscsi, value, strerror ( rc ) );
1139  goto err_decode;
1140  }
1141 
1142  /* Check CHAP response */
1143  if ( len != ( int ) iscsi->chap.response_len ) {
1144  DBGC ( iscsi, "iSCSI %p invalid CHAP response length\n",
1145  iscsi );
1147  goto err_response_len;
1148  }
1149  if ( memcmp ( buf, iscsi->chap.response, len ) != 0 ) {
1150  DBGC ( iscsi, "iSCSI %p incorrect CHAP response \"%s\"\n",
1151  iscsi, value );
1153  goto err_response;
1154  }
1155 
1156  /* Mark session as authenticated */
1158 
1159  err_response:
1160  err_response_len:
1161  err_decode:
1162  free ( buf );
1163  err_alloc:
1164  err_chap_init:
1165  return rc;
1166 }
1167 
1168 /** An iSCSI text string that we want to handle */
1170  /** String key
1171  *
1172  * This is the portion preceding the "=" sign,
1173  * e.g. "InitiatorName", "CHAP_A", etc.
1174  */
1175  const char *key;
1176  /** Handle iSCSI string value
1177  *
1178  * @v iscsi iSCSI session
1179  * @v value iSCSI string value
1180  * @ret rc Return status code
1181  */
1182  int ( * handle ) ( struct iscsi_session *iscsi, const char *value );
1183 };
1184 
1185 /** iSCSI text strings that we want to handle */
1187  { "TargetAddress", iscsi_handle_targetaddress_value },
1188  { "MaxBurstLength", iscsi_handle_maxburstlength_value },
1189  { "AuthMethod", iscsi_handle_authmethod_value },
1190  { "CHAP_A", iscsi_handle_chap_a_value },
1191  { "CHAP_I", iscsi_handle_chap_i_value },
1192  { "CHAP_C", iscsi_handle_chap_c_value },
1193  { "CHAP_N", iscsi_handle_chap_n_value },
1194  { "CHAP_R", iscsi_handle_chap_r_value },
1195  { NULL, NULL }
1196 };
1197 
1198 /**
1199  * Handle iSCSI string
1200  *
1201  * @v iscsi iSCSI session
1202  * @v string iSCSI string (in "key=value" format)
1203  * @ret rc Return status code
1204  */
1205 static int iscsi_handle_string ( struct iscsi_session *iscsi,
1206  const char *string ) {
1207  struct iscsi_string_type *type;
1208  const char *separator;
1209  const char *value;
1210  size_t key_len;
1211  int rc;
1212 
1213  /* Find separator */
1214  separator = strchr ( string, '=' );
1215  if ( ! separator ) {
1216  DBGC ( iscsi, "iSCSI %p malformed string %s\n",
1217  iscsi, string );
1219  }
1220  key_len = ( separator - string );
1221  value = ( separator + 1 );
1222 
1223  /* Check for rejections. Since we send only non-rejectable
1224  * values, any rejection is a fatal protocol error.
1225  */
1226  if ( strcmp ( value, "Reject" ) == 0 ) {
1227  DBGC ( iscsi, "iSCSI %p rejection: %s\n", iscsi, string );
1228  return -EPROTO_VALUE_REJECTED;
1229  }
1230 
1231  /* Handle key/value pair */
1232  for ( type = iscsi_string_types ; type->key ; type++ ) {
1233  if ( strncmp ( string, type->key, key_len ) != 0 )
1234  continue;
1235  DBGC ( iscsi, "iSCSI %p handling %s\n", iscsi, string );
1236  if ( ( rc = type->handle ( iscsi, value ) ) != 0 ) {
1237  DBGC ( iscsi, "iSCSI %p could not handle %s: %s\n",
1238  iscsi, string, strerror ( rc ) );
1239  return rc;
1240  }
1241  return 0;
1242  }
1243  DBGC ( iscsi, "iSCSI %p ignoring %s\n", iscsi, string );
1244  return 0;
1245 }
1246 
1247 /**
1248  * Handle iSCSI strings
1249  *
1250  * @v iscsi iSCSI session
1251  * @v string iSCSI string buffer
1252  * @v len Length of string buffer
1253  * @ret rc Return status code
1254  */
1255 static int iscsi_handle_strings ( struct iscsi_session *iscsi,
1256  const char *strings, size_t len ) {
1257  size_t string_len;
1258  int rc;
1259 
1260  /* Handle each string in turn, taking care not to overrun the
1261  * data buffer in case of badly-terminated data.
1262  */
1263  while ( 1 ) {
1264  string_len = ( strnlen ( strings, len ) + 1 );
1265  if ( string_len > len )
1266  break;
1267  if ( ( rc = iscsi_handle_string ( iscsi, strings ) ) != 0 )
1268  return rc;
1269  strings += string_len;
1270  len -= string_len;
1271  }
1272  return 0;
1273 }
1274 
1275 /**
1276  * Convert iSCSI response status to return status code
1277  *
1278  * @v status_class iSCSI status class
1279  * @v status_detail iSCSI status detail
1280  * @ret rc Return status code
1281  */
1282 static int iscsi_status_to_rc ( unsigned int status_class,
1283  unsigned int status_detail ) {
1284  switch ( status_class ) {
1286  switch ( status_detail ) {
1293  return -ENODEV;
1294  default :
1295  return -ENOTSUP_INITIATOR_STATUS;
1296  }
1298  switch ( status_detail ) {
1300  return -EIO_TARGET_UNAVAILABLE;
1302  return -EIO_TARGET_NO_RESOURCES;
1303  default:
1304  return -ENOTSUP_TARGET_STATUS;
1305  }
1306  default :
1307  return -EINVAL;
1308  }
1309 }
1310 
1311 /**
1312  * Receive data segment of an iSCSI login response PDU
1313  *
1314  * @v iscsi iSCSI session
1315  * @v data Received data
1316  * @v len Length of received data
1317  * @v remaining Data remaining after this data
1318  * @ret rc Return status code
1319  */
1320 static int iscsi_rx_login_response ( struct iscsi_session *iscsi,
1321  const void *data, size_t len,
1322  size_t remaining ) {
1323  struct iscsi_bhs_login_response *response
1324  = &iscsi->rx_bhs.login_response;
1325  int rc;
1326 
1327  /* Buffer up the PDU data */
1328  if ( ( rc = iscsi_rx_buffered_data ( iscsi, data, len ) ) != 0 ) {
1329  DBGC ( iscsi, "iSCSI %p could not buffer login response: %s\n",
1330  iscsi, strerror ( rc ) );
1331  return rc;
1332  }
1333  if ( remaining )
1334  return 0;
1335 
1336  /* Process string data and discard string buffer */
1337  if ( ( rc = iscsi_handle_strings ( iscsi, iscsi->rx_buffer,
1338  iscsi->rx_len ) ) != 0 )
1339  return rc;
1340  iscsi_rx_buffered_data_done ( iscsi );
1341 
1342  /* Check for login redirection */
1343  if ( response->status_class == ISCSI_STATUS_REDIRECT ) {
1344  DBGC ( iscsi, "iSCSI %p redirecting to new server\n", iscsi );
1345  iscsi_close_connection ( iscsi, 0 );
1346  if ( ( rc = iscsi_open_connection ( iscsi ) ) != 0 ) {
1347  DBGC ( iscsi, "iSCSI %p could not redirect: %s\n ",
1348  iscsi, strerror ( rc ) );
1349  return rc;
1350  }
1351  return 0;
1352  }
1353 
1354  /* Check for fatal errors */
1355  if ( response->status_class != 0 ) {
1356  DBGC ( iscsi, "iSCSI login failure: class %02x detail %02x\n",
1357  response->status_class, response->status_detail );
1358  rc = iscsi_status_to_rc ( response->status_class,
1359  response->status_detail );
1360  return rc;
1361  }
1362 
1363  /* Handle login transitions */
1364  if ( response->flags & ISCSI_LOGIN_FLAG_TRANSITION ) {
1365  iscsi->status &= ~( ISCSI_STATUS_PHASE_MASK |
1367  switch ( response->flags & ISCSI_LOGIN_NSG_MASK ) {
1369  iscsi->status |=
1372  break;
1375  break;
1376  default:
1377  DBGC ( iscsi, "iSCSI %p got invalid response flags "
1378  "%02x\n", iscsi, response->flags );
1379  return -EIO;
1380  }
1381  }
1382 
1383  /* Send next login request PDU if we haven't reached the full
1384  * feature phase yet.
1385  */
1386  if ( ( iscsi->status & ISCSI_STATUS_PHASE_MASK ) !=
1388  iscsi_start_login ( iscsi );
1389  return 0;
1390  }
1391 
1392  /* Check that target authentication was successful (if required) */
1393  if ( ( iscsi->status & ISCSI_STATUS_AUTH_REVERSE_REQUIRED ) &&
1394  ! ( iscsi->status & ISCSI_STATUS_AUTH_REVERSE_OK ) ) {
1395  DBGC ( iscsi, "iSCSI %p nefarious target tried to bypass "
1396  "authentication\n", iscsi );
1397  return -EPROTO;
1398  }
1399 
1400  /* Notify SCSI layer of window change */
1401  DBGC ( iscsi, "iSCSI %p entering full feature phase\n", iscsi );
1402  xfer_window_changed ( &iscsi->control );
1403 
1404  return 0;
1405 }
1406 
1407 /****************************************************************************
1408  *
1409  * iSCSI to socket interface
1410  *
1411  */
1412 
1413 /**
1414  * Pause TX engine
1415  *
1416  * @v iscsi iSCSI session
1417  */
1418 static void iscsi_tx_pause ( struct iscsi_session *iscsi ) {
1419  process_del ( &iscsi->process );
1420 }
1421 
1422 /**
1423  * Resume TX engine
1424  *
1425  * @v iscsi iSCSI session
1426  */
1427 static void iscsi_tx_resume ( struct iscsi_session *iscsi ) {
1428  process_add ( &iscsi->process );
1429 }
1430 
1431 /**
1432  * Start up a new TX PDU
1433  *
1434  * @v iscsi iSCSI session
1435  *
1436  * This initiates the process of sending a new PDU. Only one PDU may
1437  * be in transit at any one time.
1438  */
1439 static void iscsi_start_tx ( struct iscsi_session *iscsi ) {
1440 
1441  assert ( iscsi->tx_state == ISCSI_TX_IDLE );
1442 
1443  /* Initialise TX BHS */
1444  memset ( &iscsi->tx_bhs, 0, sizeof ( iscsi->tx_bhs ) );
1445 
1446  /* Flag TX engine to start transmitting */
1447  iscsi->tx_state = ISCSI_TX_BHS;
1448 
1449  /* Start transmission process */
1450  iscsi_tx_resume ( iscsi );
1451 }
1452 
1453 /**
1454  * Transmit nothing
1455  *
1456  * @v iscsi iSCSI session
1457  * @ret rc Return status code
1458  */
1459 static int iscsi_tx_nothing ( struct iscsi_session *iscsi __unused ) {
1460  return 0;
1461 }
1462 
1463 /**
1464  * Transmit basic header segment of an iSCSI PDU
1465  *
1466  * @v iscsi iSCSI session
1467  * @ret rc Return status code
1468  */
1469 static int iscsi_tx_bhs ( struct iscsi_session *iscsi ) {
1470  return xfer_deliver_raw ( &iscsi->socket, &iscsi->tx_bhs,
1471  sizeof ( iscsi->tx_bhs ) );
1472 }
1473 
1474 /**
1475  * Transmit data segment of an iSCSI PDU
1476  *
1477  * @v iscsi iSCSI session
1478  * @ret rc Return status code
1479  *
1480  * Handle transmission of part of a PDU data segment. iscsi::tx_bhs
1481  * will be valid when this is called.
1482  */
1483 static int iscsi_tx_data ( struct iscsi_session *iscsi ) {
1484  struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
1485 
1486  switch ( common->opcode & ISCSI_OPCODE_MASK ) {
1487  case ISCSI_OPCODE_DATA_OUT:
1488  return iscsi_tx_data_out ( iscsi );
1490  return iscsi_tx_login_request ( iscsi );
1491  default:
1492  /* Nothing to send in other states */
1493  return 0;
1494  }
1495 }
1496 
1497 /**
1498  * Complete iSCSI PDU transmission
1499  *
1500  * @v iscsi iSCSI session
1501  *
1502  * Called when a PDU has been completely transmitted and the TX state
1503  * machine is about to enter the idle state. iscsi::tx_bhs will be
1504  * valid for the just-completed PDU when this is called.
1505  */
1506 static void iscsi_tx_done ( struct iscsi_session *iscsi ) {
1507  struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
1508 
1509  /* Stop transmission process */
1510  iscsi_tx_pause ( iscsi );
1511 
1512  switch ( common->opcode & ISCSI_OPCODE_MASK ) {
1513  case ISCSI_OPCODE_DATA_OUT:
1514  iscsi_data_out_done ( iscsi );
1515  break;
1517  iscsi_login_request_done ( iscsi );
1518  break;
1519  default:
1520  /* No action */
1521  break;
1522  }
1523 }
1524 
1525 /**
1526  * Transmit iSCSI PDU
1527  *
1528  * @v iscsi iSCSI session
1529  * @v buf Temporary data buffer
1530  * @v len Length of temporary data buffer
1531  *
1532  * Constructs data to be sent for the current TX state
1533  */
1534 static void iscsi_tx_step ( struct iscsi_session *iscsi ) {
1535  struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
1536  int ( * tx ) ( struct iscsi_session *iscsi );
1537  enum iscsi_tx_state next_state;
1538  size_t tx_len;
1539  int rc;
1540 
1541  /* Select fragment to transmit */
1542  while ( 1 ) {
1543  switch ( iscsi->tx_state ) {
1544  case ISCSI_TX_BHS:
1545  tx = iscsi_tx_bhs;
1546  tx_len = sizeof ( iscsi->tx_bhs );
1547  next_state = ISCSI_TX_AHS;
1548  break;
1549  case ISCSI_TX_AHS:
1550  tx = iscsi_tx_nothing;
1551  tx_len = 0;
1552  next_state = ISCSI_TX_DATA;
1553  break;
1554  case ISCSI_TX_DATA:
1555  tx = iscsi_tx_data;
1556  tx_len = ISCSI_DATA_LEN ( common->lengths );
1557  next_state = ISCSI_TX_IDLE;
1558  break;
1559  case ISCSI_TX_IDLE:
1560  /* Nothing to do; pause processing */
1561  iscsi_tx_pause ( iscsi );
1562  return;
1563  default:
1564  assert ( 0 );
1565  return;
1566  }
1567 
1568  /* Check for window availability, if needed */
1569  if ( tx_len && ( xfer_window ( &iscsi->socket ) == 0 ) ) {
1570  /* Cannot transmit at this point; pause
1571  * processing and wait for window to reopen
1572  */
1573  iscsi_tx_pause ( iscsi );
1574  return;
1575  }
1576 
1577  /* Transmit data */
1578  if ( ( rc = tx ( iscsi ) ) != 0 ) {
1579  DBGC ( iscsi, "iSCSI %p could not transmit: %s\n",
1580  iscsi, strerror ( rc ) );
1581  /* Transmission errors are fatal */
1582  iscsi_close ( iscsi, rc );
1583  return;
1584  }
1585 
1586  /* Move to next state */
1587  iscsi->tx_state = next_state;
1588 
1589  /* If we have moved to the idle state, mark
1590  * transmission as complete
1591  */
1592  if ( iscsi->tx_state == ISCSI_TX_IDLE )
1593  iscsi_tx_done ( iscsi );
1594  }
1595 }
1596 
1597 /** iSCSI TX process descriptor */
1600 
1601 /**
1602  * Receive basic header segment of an iSCSI PDU
1603  *
1604  * @v iscsi iSCSI session
1605  * @v data Received data
1606  * @v len Length of received data
1607  * @v remaining Data remaining after this data
1608  * @ret rc Return status code
1609  *
1610  * This fills in iscsi::rx_bhs with the data from the BHS portion of
1611  * the received PDU.
1612  */
1613 static int iscsi_rx_bhs ( struct iscsi_session *iscsi, const void *data,
1614  size_t len, size_t remaining __unused ) {
1615  memcpy ( &iscsi->rx_bhs.bytes[iscsi->rx_offset], data, len );
1616  if ( ( iscsi->rx_offset + len ) >= sizeof ( iscsi->rx_bhs ) ) {
1617  DBGC2 ( iscsi, "iSCSI %p received PDU opcode %#x len %#x\n",
1618  iscsi, iscsi->rx_bhs.common.opcode,
1619  ISCSI_DATA_LEN ( iscsi->rx_bhs.common.lengths ) );
1620  }
1621  return 0;
1622 }
1623 
1624 /**
1625  * Discard portion of an iSCSI PDU.
1626  *
1627  * @v iscsi iSCSI session
1628  * @v data Received data
1629  * @v len Length of received data
1630  * @v remaining Data remaining after this data
1631  * @ret rc Return status code
1632  *
1633  * This discards data from a portion of a received PDU.
1634  */
1635 static int iscsi_rx_discard ( struct iscsi_session *iscsi __unused,
1636  const void *data __unused, size_t len __unused,
1637  size_t remaining __unused ) {
1638  /* Do nothing */
1639  return 0;
1640 }
1641 
1642 /**
1643  * Receive data segment of an iSCSI PDU
1644  *
1645  * @v iscsi iSCSI session
1646  * @v data Received data
1647  * @v len Length of received data
1648  * @v remaining Data remaining after this data
1649  * @ret rc Return status code
1650  *
1651  * Handle processing of part of a PDU data segment. iscsi::rx_bhs
1652  * will be valid when this is called.
1653  */
1654 static int iscsi_rx_data ( struct iscsi_session *iscsi, const void *data,
1655  size_t len, size_t remaining ) {
1656  struct iscsi_bhs_common_response *response
1657  = &iscsi->rx_bhs.common_response;
1658 
1659  /* Update cmdsn and statsn */
1660  iscsi->cmdsn = ntohl ( response->expcmdsn );
1661  iscsi->statsn = ntohl ( response->statsn );
1662 
1663  switch ( response->opcode & ISCSI_OPCODE_MASK ) {
1665  return iscsi_rx_login_response ( iscsi, data, len, remaining );
1667  return iscsi_rx_scsi_response ( iscsi, data, len, remaining );
1668  case ISCSI_OPCODE_DATA_IN:
1669  return iscsi_rx_data_in ( iscsi, data, len, remaining );
1670  case ISCSI_OPCODE_R2T:
1671  return iscsi_rx_r2t ( iscsi, data, len, remaining );
1672  case ISCSI_OPCODE_NOP_IN:
1673  return iscsi_rx_nop_in ( iscsi, data, len, remaining );
1674  default:
1675  if ( remaining )
1676  return 0;
1677  DBGC ( iscsi, "iSCSI %p unknown opcode %02x\n", iscsi,
1678  response->opcode );
1679  return -ENOTSUP_OPCODE;
1680  }
1681 }
1682 
1683 /**
1684  * Receive new data
1685  *
1686  * @v iscsi iSCSI session
1687  * @v iobuf I/O buffer
1688  * @v meta Data transfer metadata
1689  * @ret rc Return status code
1690  *
1691  * This handles received PDUs. The receive strategy is to fill in
1692  * iscsi::rx_bhs with the contents of the BHS portion of the PDU,
1693  * throw away any AHS portion, and then process each part of the data
1694  * portion as it arrives. The data processing routine therefore
1695  * always has a full copy of the BHS available, even for portions of
1696  * the data in different packets to the BHS.
1697  */
1698 static int iscsi_socket_deliver ( struct iscsi_session *iscsi,
1699  struct io_buffer *iobuf,
1700  struct xfer_metadata *meta __unused ) {
1701  struct iscsi_bhs_common *common = &iscsi->rx_bhs.common;
1702  int ( * rx ) ( struct iscsi_session *iscsi, const void *data,
1703  size_t len, size_t remaining );
1704  enum iscsi_rx_state next_state;
1705  size_t frag_len;
1706  size_t remaining;
1707  int rc;
1708 
1709  while ( 1 ) {
1710  switch ( iscsi->rx_state ) {
1711  case ISCSI_RX_BHS:
1712  rx = iscsi_rx_bhs;
1713  iscsi->rx_len = sizeof ( iscsi->rx_bhs );
1714  next_state = ISCSI_RX_AHS;
1715  break;
1716  case ISCSI_RX_AHS:
1717  rx = iscsi_rx_discard;
1718  iscsi->rx_len = 4 * ISCSI_AHS_LEN ( common->lengths );
1719  next_state = ISCSI_RX_DATA;
1720  break;
1721  case ISCSI_RX_DATA:
1722  rx = iscsi_rx_data;
1723  iscsi->rx_len = ISCSI_DATA_LEN ( common->lengths );
1724  next_state = ISCSI_RX_DATA_PADDING;
1725  break;
1726  case ISCSI_RX_DATA_PADDING:
1727  rx = iscsi_rx_discard;
1728  iscsi->rx_len = ISCSI_DATA_PAD_LEN ( common->lengths );
1729  next_state = ISCSI_RX_BHS;
1730  break;
1731  default:
1732  assert ( 0 );
1733  rc = -EINVAL;
1734  goto done;
1735  }
1736 
1737  frag_len = iscsi->rx_len - iscsi->rx_offset;
1738  if ( frag_len > iob_len ( iobuf ) )
1739  frag_len = iob_len ( iobuf );
1740  remaining = iscsi->rx_len - iscsi->rx_offset - frag_len;
1741  if ( ( rc = rx ( iscsi, iobuf->data, frag_len,
1742  remaining ) ) != 0 ) {
1743  DBGC ( iscsi, "iSCSI %p could not process received "
1744  "data: %s\n", iscsi, strerror ( rc ) );
1745  goto done;
1746  }
1747 
1748  iscsi->rx_offset += frag_len;
1749  iob_pull ( iobuf, frag_len );
1750 
1751  /* If all the data for this state has not yet been
1752  * received, stay in this state for now.
1753  */
1754  if ( iscsi->rx_offset != iscsi->rx_len ) {
1755  rc = 0;
1756  goto done;
1757  }
1758 
1759  iscsi->rx_state = next_state;
1760  iscsi->rx_offset = 0;
1761  }
1762 
1763  done:
1764  /* Free I/O buffer */
1765  free_iob ( iobuf );
1766 
1767  /* Destroy session on error */
1768  if ( rc != 0 )
1769  iscsi_close ( iscsi, rc );
1770 
1771  return rc;
1772 }
1773 
1774 /**
1775  * Handle redirection event
1776  *
1777  * @v iscsi iSCSI session
1778  * @v type Location type
1779  * @v args Remaining arguments depend upon location type
1780  * @ret rc Return status code
1781  */
1782 static int iscsi_vredirect ( struct iscsi_session *iscsi, int type,
1783  va_list args ) {
1784  va_list tmp;
1785  struct sockaddr *peer;
1786  int rc;
1787 
1788  /* Intercept redirects to a LOCATION_SOCKET and record the IP
1789  * address for the iBFT. This is a bit of a hack, but avoids
1790  * inventing an ioctl()-style call to retrieve the socket
1791  * address from a data-xfer interface.
1792  */
1793  if ( type == LOCATION_SOCKET ) {
1794  va_copy ( tmp, args );
1795  ( void ) va_arg ( tmp, int ); /* Discard "semantics" */
1796  peer = va_arg ( tmp, struct sockaddr * );
1797  memcpy ( &iscsi->target_sockaddr, peer,
1798  sizeof ( iscsi->target_sockaddr ) );
1799  va_end ( tmp );
1800  }
1801 
1802  /* Redirect to new location */
1803  if ( ( rc = xfer_vreopen ( &iscsi->socket, type, args ) ) != 0 )
1804  goto err;
1805 
1806  return 0;
1807 
1808  err:
1809  iscsi_close ( iscsi, rc );
1810  return rc;
1811 }
1812 
1813 /** iSCSI socket interface operations */
1817  iscsi_tx_resume ),
1820 };
1821 
1822 /** iSCSI socket interface descriptor */
1824  INTF_DESC ( struct iscsi_session, socket, iscsi_socket_operations );
1825 
1826 /****************************************************************************
1827  *
1828  * iSCSI command issuing
1829  *
1830  */
1831 
1832 /**
1833  * Check iSCSI flow-control window
1834  *
1835  * @v iscsi iSCSI session
1836  * @ret len Length of window
1837  */
1838 static size_t iscsi_scsi_window ( struct iscsi_session *iscsi ) {
1839 
1840  if ( ( ( iscsi->status & ISCSI_STATUS_PHASE_MASK ) ==
1842  ( iscsi->command == NULL ) ) {
1843  /* We cannot handle concurrent commands */
1844  return 1;
1845  } else {
1846  return 0;
1847  }
1848 }
1849 
1850 /**
1851  * Issue iSCSI SCSI command
1852  *
1853  * @v iscsi iSCSI session
1854  * @v parent Parent interface
1855  * @v command SCSI command
1856  * @ret tag Command tag, or negative error
1857  */
1858 static int iscsi_scsi_command ( struct iscsi_session *iscsi,
1859  struct interface *parent,
1860  struct scsi_cmd *command ) {
1861 
1862  /* This iSCSI implementation cannot handle multiple concurrent
1863  * commands or commands arriving before login is complete.
1864  */
1865  if ( iscsi_scsi_window ( iscsi ) == 0 ) {
1866  DBGC ( iscsi, "iSCSI %p cannot handle concurrent commands\n",
1867  iscsi );
1868  return -EOPNOTSUPP;
1869  }
1870 
1871  /* Store command */
1872  iscsi->command = malloc ( sizeof ( *command ) );
1873  if ( ! iscsi->command )
1874  return -ENOMEM;
1875  memcpy ( iscsi->command, command, sizeof ( *command ) );
1876 
1877  /* Assign new ITT */
1878  iscsi_new_itt ( iscsi );
1879 
1880  /* Start sending command */
1881  iscsi_start_command ( iscsi );
1882 
1883  /* Attach to parent interface and return */
1884  intf_plug_plug ( &iscsi->data, parent );
1885  return iscsi->itt;
1886 }
1887 
1888 /**
1889  * Update SCSI block device capacity
1890  *
1891  * @v iscsi iSCSI session
1892  * @v capacity Block device capacity
1893  */
1894 static void iscsi_scsi_capacity ( struct iscsi_session *iscsi,
1895  struct block_device_capacity *capacity ) {
1896  unsigned int max_count;
1897 
1898  /* Limit maximum number of blocks per transfer to fit MaxBurstLength */
1899  if ( capacity->blksize ) {
1900  max_count = ( iscsi->max_burst_len / capacity->blksize );
1901  if ( max_count < capacity->max_count )
1902  capacity->max_count = max_count;
1903  }
1904 }
1905 
1906 /**
1907  * Get iSCSI ACPI descriptor
1908  *
1909  * @v iscsi iSCSI session
1910  * @ret desc ACPI descriptor
1911  */
1912 static struct acpi_descriptor * iscsi_describe ( struct iscsi_session *iscsi ) {
1913 
1914  return &iscsi->desc;
1915 }
1916 
1917 /** iSCSI SCSI command-issuing interface operations */
1925 };
1926 
1927 /** iSCSI SCSI command-issuing interface descriptor */
1930 
1931 /**
1932  * Close iSCSI command
1933  *
1934  * @v iscsi iSCSI session
1935  * @v rc Reason for close
1936  */
1937 static void iscsi_command_close ( struct iscsi_session *iscsi, int rc ) {
1938 
1939  /* Restart interface */
1940  intf_restart ( &iscsi->data, rc );
1941 
1942  /* Treat unsolicited command closures mid-command as fatal,
1943  * because we have no code to handle partially-completed PDUs.
1944  */
1945  if ( iscsi->command != NULL )
1946  iscsi_close ( iscsi, ( ( rc == 0 ) ? -ECANCELED : rc ) );
1947 }
1948 
1949 /** iSCSI SCSI command interface operations */
1952 };
1953 
1954 /** iSCSI SCSI command interface descriptor */
1957 
1958 /****************************************************************************
1959  *
1960  * Instantiator
1961  *
1962  */
1963 
1964 /** iSCSI root path components (as per RFC4173) */
1972 };
1973 
1974 /** iSCSI initiator IQN setting */
1975 const struct setting initiator_iqn_setting __setting ( SETTING_SANBOOT_EXTRA,
1976  initiator-iqn ) = {
1977  .name = "initiator-iqn",
1978  .description = "iSCSI initiator name",
1979  .tag = DHCP_ISCSI_INITIATOR_IQN,
1980  .type = &setting_type_string,
1981 };
1982 
1983 /** iSCSI reverse username setting */
1984 const struct setting reverse_username_setting __setting ( SETTING_AUTH_EXTRA,
1985  reverse-username ) = {
1986  .name = "reverse-username",
1987  .description = "Reverse user name",
1988  .tag = DHCP_EB_REVERSE_USERNAME,
1989  .type = &setting_type_string,
1990 };
1991 
1992 /** iSCSI reverse password setting */
1993 const struct setting reverse_password_setting __setting ( SETTING_AUTH_EXTRA,
1994  reverse-password ) = {
1995  .name = "reverse-password",
1996  .description = "Reverse password",
1997  .tag = DHCP_EB_REVERSE_PASSWORD,
1998  .type = &setting_type_string,
1999 };
2000 
2001 /**
2002  * Parse iSCSI root path
2003  *
2004  * @v iscsi iSCSI session
2005  * @v root_path iSCSI root path (as per RFC4173)
2006  * @ret rc Return status code
2007  */
2008 static int iscsi_parse_root_path ( struct iscsi_session *iscsi,
2009  const char *root_path ) {
2010  char *rp_copy;
2011  char *rp_comp[NUM_RP_COMPONENTS];
2012  char *rp;
2013  int skip = 0;
2014  int i = 0;
2015  int rc;
2016 
2017  /* Create modifiable copy of root path */
2018  rp_copy = strdup ( root_path );
2019  if ( ! rp_copy ) {
2020  rc = -ENOMEM;
2021  goto err_strdup;
2022  }
2023  rp = rp_copy;
2024 
2025  /* Split root path into component parts */
2026  while ( 1 ) {
2027  rp_comp[i++] = rp;
2028  if ( i == NUM_RP_COMPONENTS )
2029  break;
2030  for ( ; ( ( *rp != ':' ) || skip ) ; rp++ ) {
2031  if ( ! *rp ) {
2032  DBGC ( iscsi, "iSCSI %p root path \"%s\" "
2033  "too short\n", iscsi, root_path );
2035  goto err_split;
2036  } else if ( *rp == '[' ) {
2037  skip = 1;
2038  } else if ( *rp == ']' ) {
2039  skip = 0;
2040  }
2041  }
2042  *(rp++) = '\0';
2043  }
2044 
2045  /* Use root path components to configure iSCSI session */
2046  iscsi->target_address = strdup ( rp_comp[RP_SERVERNAME] );
2047  if ( ! iscsi->target_address ) {
2048  rc = -ENOMEM;
2049  goto err_servername;
2050  }
2051  iscsi->target_port = strtoul ( rp_comp[RP_PORT], NULL, 10 );
2052  if ( ! iscsi->target_port )
2053  iscsi->target_port = ISCSI_PORT;
2054  if ( ( rc = scsi_parse_lun ( rp_comp[RP_LUN], &iscsi->lun ) ) != 0 ) {
2055  DBGC ( iscsi, "iSCSI %p invalid LUN \"%s\"\n",
2056  iscsi, rp_comp[RP_LUN] );
2057  goto err_lun;
2058  }
2059  iscsi->target_iqn = strdup ( rp_comp[RP_TARGETNAME] );
2060  if ( ! iscsi->target_iqn ) {
2061  rc = -ENOMEM;
2062  goto err_targetname;
2063  }
2064 
2065  err_targetname:
2066  err_lun:
2067  err_servername:
2068  err_split:
2069  free ( rp_copy );
2070  err_strdup:
2071  return rc;
2072 }
2073 
2074 /**
2075  * Fetch iSCSI settings
2076  *
2077  * @v iscsi iSCSI session
2078  * @ret rc Return status code
2079  */
2080 static int iscsi_fetch_settings ( struct iscsi_session *iscsi ) {
2081  char *hostname;
2082  union uuid uuid;
2083  int len;
2084 
2085  /* Fetch relevant settings. Don't worry about freeing on
2086  * error, since iscsi_free() will take care of that anyway.
2087  */
2088  fetch_string_setting_copy ( NULL, &username_setting,
2089  &iscsi->initiator_username );
2090  fetch_string_setting_copy ( NULL, &password_setting,
2091  &iscsi->initiator_password );
2092  fetch_string_setting_copy ( NULL, &reverse_username_setting,
2093  &iscsi->target_username );
2094  fetch_string_setting_copy ( NULL, &reverse_password_setting,
2095  &iscsi->target_password );
2096 
2097  /* Use explicit initiator IQN if provided */
2098  fetch_string_setting_copy ( NULL, &initiator_iqn_setting,
2099  &iscsi->initiator_iqn );
2100  if ( iscsi->initiator_iqn )
2101  return 0;
2102 
2103  /* Otherwise, try to construct an initiator IQN from the hostname */
2104  fetch_string_setting_copy ( NULL, &hostname_setting, &hostname );
2105  if ( hostname ) {
2106  len = asprintf ( &iscsi->initiator_iqn,
2107  ISCSI_DEFAULT_IQN_PREFIX ":%s", hostname );
2108  free ( hostname );
2109  if ( len < 0 ) {
2110  DBGC ( iscsi, "iSCSI %p could not allocate initiator "
2111  "IQN\n", iscsi );
2112  return -ENOMEM;
2113  }
2114  assert ( iscsi->initiator_iqn );
2115  return 0;
2116  }
2117 
2118  /* Otherwise, try to construct an initiator IQN from the UUID */
2119  if ( ( len = fetch_uuid_setting ( NULL, &uuid_setting, &uuid ) ) < 0 ) {
2120  DBGC ( iscsi, "iSCSI %p has no suitable initiator IQN\n",
2121  iscsi );
2122  return -EINVAL_NO_INITIATOR_IQN;
2123  }
2124  if ( ( len = asprintf ( &iscsi->initiator_iqn,
2126  uuid_ntoa ( &uuid ) ) ) < 0 ) {
2127  DBGC ( iscsi, "iSCSI %p could not allocate initiator IQN\n",
2128  iscsi );
2129  return -ENOMEM;
2130  }
2131  assert ( iscsi->initiator_iqn );
2132 
2133  return 0;
2134 }
2135 
2136 
2137 /**
2138  * Check iSCSI authentication details
2139  *
2140  * @v iscsi iSCSI session
2141  * @ret rc Return status code
2142  */
2143 static int iscsi_check_auth ( struct iscsi_session *iscsi ) {
2144 
2145  /* Check for invalid authentication combinations */
2146  if ( ( /* Initiator username without password (or vice-versa) */
2147  ( !! iscsi->initiator_username ) ^
2148  ( !! iscsi->initiator_password ) ) ||
2149  ( /* Target username without password (or vice-versa) */
2150  ( !! iscsi->target_username ) ^
2151  ( !! iscsi->target_password ) ) ||
2152  ( /* Target (reverse) without initiator (forward) */
2153  ( iscsi->target_username &&
2154  ( ! iscsi->initiator_username ) ) ) ) {
2155  DBGC ( iscsi, "iSCSI %p invalid credentials: initiator "
2156  "%sname,%spw, target %sname,%spw\n", iscsi,
2157  ( iscsi->initiator_username ? "" : "no " ),
2158  ( iscsi->initiator_password ? "" : "no " ),
2159  ( iscsi->target_username ? "" : "no " ),
2160  ( iscsi->target_password ? "" : "no " ) );
2161  return -EINVAL_BAD_CREDENTIAL_MIX;
2162  }
2163 
2164  return 0;
2165 }
2166 
2167 /**
2168  * Open iSCSI URI
2169  *
2170  * @v parent Parent interface
2171  * @v uri URI
2172  * @ret rc Return status code
2173  */
2174 static int iscsi_open ( struct interface *parent, struct uri *uri ) {
2175  struct iscsi_session *iscsi;
2176  int rc;
2177 
2178  /* Sanity check */
2179  if ( ! uri->opaque ) {
2181  goto err_sanity_uri;
2182  }
2183 
2184  /* Allocate and initialise structure */
2185  iscsi = zalloc ( sizeof ( *iscsi ) );
2186  if ( ! iscsi ) {
2187  rc = -ENOMEM;
2188  goto err_zalloc;
2189  }
2190  ref_init ( &iscsi->refcnt, iscsi_free );
2191  intf_init ( &iscsi->control, &iscsi_control_desc, &iscsi->refcnt );
2192  intf_init ( &iscsi->data, &iscsi_data_desc, &iscsi->refcnt );
2193  intf_init ( &iscsi->socket, &iscsi_socket_desc, &iscsi->refcnt );
2195  &iscsi->refcnt );
2196  acpi_init ( &iscsi->desc, &ibft_model, &iscsi->refcnt );
2197 
2198  /* Parse root path */
2199  if ( ( rc = iscsi_parse_root_path ( iscsi, uri->opaque ) ) != 0 )
2200  goto err_parse_root_path;
2201  /* Set fields not specified by root path */
2202  if ( ( rc = iscsi_fetch_settings ( iscsi ) ) != 0 )
2203  goto err_fetch_settings;
2204  /* Validate authentication */
2205  if ( ( rc = iscsi_check_auth ( iscsi ) ) != 0 )
2206  goto err_check_auth;
2207 
2208  /* Sanity checks */
2209  if ( ! iscsi->target_address ) {
2210  DBGC ( iscsi, "iSCSI %p does not yet support discovery\n",
2211  iscsi );
2212  rc = -ENOTSUP_DISCOVERY;
2213  goto err_sanity_address;
2214  }
2215  if ( ! iscsi->target_iqn ) {
2216  DBGC ( iscsi, "iSCSI %p no target address supplied in %s\n",
2217  iscsi, uri->opaque );
2219  goto err_sanity_iqn;
2220  }
2221  DBGC ( iscsi, "iSCSI %p initiator %s\n",iscsi, iscsi->initiator_iqn );
2222  DBGC ( iscsi, "iSCSI %p target %s %s\n",
2223  iscsi, iscsi->target_address, iscsi->target_iqn );
2224 
2225  /* Open socket */
2226  if ( ( rc = iscsi_open_connection ( iscsi ) ) != 0 )
2227  goto err_open_connection;
2228 
2229  /* Attach SCSI device to parent interface */
2230  if ( ( rc = scsi_open ( parent, &iscsi->control,
2231  &iscsi->lun ) ) != 0 ) {
2232  DBGC ( iscsi, "iSCSI %p could not create SCSI device: %s\n",
2233  iscsi, strerror ( rc ) );
2234  goto err_scsi_open;
2235  }
2236 
2237  /* Mortalise self, and return */
2238  ref_put ( &iscsi->refcnt );
2239  return 0;
2240 
2241  err_scsi_open:
2242  err_open_connection:
2243  err_sanity_iqn:
2244  err_sanity_address:
2245  err_check_auth:
2246  err_fetch_settings:
2247  err_parse_root_path:
2248  iscsi_close ( iscsi, rc );
2249  ref_put ( &iscsi->refcnt );
2250  err_zalloc:
2251  err_sanity_uri:
2252  return rc;
2253 }
2254 
2255 /** iSCSI URI opener */
2256 struct uri_opener iscsi_uri_opener __uri_opener = {
2257  .scheme = "iscsi",
2258  .open = iscsi_open,
2259 };
#define ISCSI_STATUS_AUTH_REVERSE_REQUIRED
Initiator requires target (reverse) authentication.
Definition: iscsi.h:708
void scsi_parse_sense(const void *data, size_t len, struct scsi_sns_descriptor *sense)
Parse SCSI sense data.
Definition: scsi.c:146
#define EINVAL_BAD_CREDENTIAL_MIX
Definition: iscsi.c:74
A process.
Definition: process.h:17
#define iob_pull(iobuf, len)
Definition: iobuf.h:102
#define EINVAL
Invalid argument.
Definition: errno.h:428
#define ISCSI_COMMAND_FLAG_WRITE
Command will write data.
Definition: iscsi.h:291
An object interface operation.
Definition: interface.h:17
iscsi_tx_state
State of an iSCSI TX engine.
Definition: iscsi.h:520
#define ECONNRESET
Connection reset.
Definition: errno.h:363
iSCSI data-in basic header segment
Definition: iscsi.h:354
TCP/IP socket address.
Definition: tcpip.h:75
struct arbelprm_rc_send_wqe rc
Definition: arbel.h:14
iSCSI NOP-In basic header segment
Definition: iscsi.h:476
void xfer_window_changed(struct interface *intf)
Report change of flow control window.
Definition: xfer.c:146
unsigned short uint16_t
Definition: stdint.h:11
void intf_close(struct interface *intf, int rc)
Close an object interface.
Definition: interface.c:249
#define ISCSI_STATUS_FULL_FEATURE_PHASE
iSCSI session is currently in the full feature phase
Definition: iscsi.h:681
struct iscsi_bhs_login_request login_request
Definition: iscsi.h:508
void intf_restart(struct interface *intf, int rc)
Shut down and restart an object interface.
Definition: interface.c:343
static int iscsi_rx_bhs(struct iscsi_session *iscsi, const void *data, size_t len, size_t remaining __unused)
Receive basic header segment of an iSCSI PDU.
Definition: iscsi.c:1613
#define iob_put(iobuf, len)
Definition: iobuf.h:120
#define va_end(ap)
Definition: stdarg.h:9
struct iscsi_bhs_scsi_command scsi_command
Definition: iscsi.h:510
Data transfer metadata.
Definition: xfer.h:22
size_t data_out_len
Data-out buffer length.
Definition: scsi.h:260
#define SETTING_SANBOOT_EXTRA
SAN boot additional settings.
Definition: settings.h:74
#define DHCP_EB_FEATURE_ISCSI
iSCSI protocol
Definition: features.h:37
unsigned int max_count
Maximum number of blocks per single transfer.
Definition: blockdev.h:24
int xfer_deliver_iob(struct interface *intf, struct io_buffer *iobuf)
Deliver datagram as I/O buffer without metadata.
Definition: xfer.c:255
#define ENOTSUP_DISCOVERY
Definition: iscsi.c:110
static int iscsi_fetch_settings(struct iscsi_session *iscsi)
Fetch iSCSI settings.
Definition: iscsi.c:2080
uint32_t expcmdsn
Expected command sequence number.
Definition: iscsi.h:132
char * initiator_username
Initiator username (if any)
Definition: iscsi.h:572
uint8_t * response
CHAP response.
Definition: chap.h:24
unsigned long strtoul(const char *string, char **endp, int base)
Convert string to numeric value.
Definition: string.c:471
uint8_t opcode
Opcode.
Definition: iscsi.h:116
static void iscsi_tx_done(struct iscsi_session *iscsi)
Complete iSCSI PDU transmission.
Definition: iscsi.c:1506
An iSCSI session.
Definition: iscsi.h:544
struct iscsi_bhs_common common
Definition: iscsi.h:506
struct sockaddr target_sockaddr
Target socket address (for boot firmware table)
Definition: iscsi.h:661
uint32_t ttt
Target transfer tag.
Definition: iscsi.h:609
#define ISCSI_STATUS_INITIATOR_ERROR_AUTHENTICATION
Definition: iscsi.h:249
#define ISCSI_LOGIN_NSG_MASK
Definition: iscsi.h:188
#define FEATURE_PROTOCOL
Network protocols.
Definition: features.h:21
union iscsi_segment_lengths lengths
Segment lengths.
Definition: iscsi.h:412
#define ref_init(refcnt, free)
Initialise a reference counter.
Definition: refcnt.h:64
Error codes.
A universally unique ID.
Definition: uuid.h:15
Receiving the data segment.
Definition: iscsi.h:538
static void iscsi_new_itt(struct iscsi_session *iscsi)
Assign new iSCSI initiator task tag.
Definition: iscsi.c:245
#define ISCSI_DATA_PAD_LEN(segment_lengths)
The padding of the data segment, in bytes.
Definition: iscsi.h:65
#define ISCSI_DATA_FLAG_STATUS
SCSI status code and overflow/underflow flags are valid.
Definition: iscsi.h:398
static int iscsi_handle_chap_a_value(struct iscsi_session *iscsi, const char *value)
Handle iSCSI CHAP_A text value.
Definition: iscsi.c:955
A command-line command.
Definition: command.h:9
#define DHCP_ISCSI_INITIATOR_IQN
iSCSI initiator IQN
Definition: dhcp.h:536
I/O buffers.
void free_iob(struct io_buffer *iobuf)
Free I/O buffer.
Definition: iobuf.c:146
#define ISCSI_LOGIN_CSG_OPERATIONAL_NEGOTIATION
Definition: iscsi.h:184
void block_capacity(struct interface *intf, struct block_device_capacity *capacity)
Report block device capacity.
Definition: blockdev.c:129
static int iscsi_parse_root_path(struct iscsi_session *iscsi, const char *root_path)
Parse iSCSI root path.
Definition: iscsi.c:2008
#define ISCSI_DATA_FLAG_UNDERFLOW
Data underflow occurred.
Definition: iscsi.h:395
struct interface socket
Transport-layer socket.
Definition: iscsi.h:553
uint32_t type
Operating system type.
Definition: ena.h:12
#define EPROTO_INVALID_CHAP_ALGORITHM
Definition: iscsi.c:126
static __always_inline void copy_from_user(void *dest, userptr_t src, off_t src_off, size_t len)
Copy data from user buffer.
Definition: uaccess.h:337
uint32_t offset
Buffer offset.
Definition: iscsi.h:380
static int iscsi_handle_chap_c_value(struct iscsi_session *iscsi, const char *value)
Handle iSCSI CHAP_C text value.
Definition: iscsi.c:1019
const struct setting initiator_iqn_setting __setting(SETTING_SANBOOT_EXTRA, initiator-iqn)
iSCSI initiator IQN setting
printf() and friends
#define EPROTO_INVALID_CHAP_RESPONSE
Definition: iscsi.c:138
iSCSI login request basic header segment
Definition: iscsi.h:141
size_t data_in_len
Data-in buffer length.
Definition: scsi.h:267
#define ISCSI_DATA_FLAG_OVERFLOW
Data overflow occurred.
Definition: iscsi.h:392
struct iscsi_bhs_data_out data_out
Definition: iscsi.h:513
struct iscsi_bhs_common_response common_response
Definition: iscsi.h:507
#define DBGC(...)
Definition: compiler.h:505
A process descriptor.
Definition: process.h:31
#define ISCSI_STATUS_INITIATOR_ERROR_REMOVED
Definition: iscsi.h:252
uint8_t flags
Flags.
Definition: iscsi.h:308
static void iscsi_start_data_out(struct iscsi_session *iscsi, unsigned int datasn)
Build iSCSI data-out BHS.
Definition: iscsi.c:528
void chap_respond(struct chap_response *chap)
Respond to the CHAP challenge.
Definition: chap.c:104
#define ISCSI_OPCODE_SCSI_RESPONSE
SCSI response opcode.
Definition: iscsi.h:336
#define ISCSI_COMMAND_FLAG_READ
Command will read data.
Definition: iscsi.h:288
static int iscsi_tx_data_out(struct iscsi_session *iscsi)
Send iSCSI data-out data segment.
Definition: iscsi.c:582
int xfer_vredirect(struct interface *intf, int type, va_list args)
Send redirection event.
Definition: xfer.c:62
static int iscsi_rx_scsi_response(struct iscsi_session *iscsi, const void *data, size_t len, size_t remaining)
Receive data segment of an iSCSI SCSI response PDU.
Definition: iscsi.c:417
void intf_plug_plug(struct interface *a, struct interface *b)
Plug two object interfaces together.
Definition: interface.c:107
#define ISCSI_STATUS_TARGET_ERROR_NO_RESOURCES
Definition: iscsi.h:255
#define ISCSI_OPCODE_MASK
Opcode mask.
Definition: iscsi.h:96
Definition: iscsi.c:1969
uint32_t string
Definition: multiboot.h:14
#define ntohl(value)
Definition: byteswap.h:134
#define ISCSI_TAG_RESERVED
iSCSI reserved tag value
Definition: iscsi.h:108
struct io_buffer * xfer_alloc_iob(struct interface *intf, size_t len)
Allocate I/O buffer.
Definition: xfer.c:158
FEATURE(FEATURE_PROTOCOL, "iSCSI", DHCP_EB_FEATURE_ISCSI, 1)
static int iscsi_rx_data(struct iscsi_session *iscsi, const void *data, size_t len, size_t remaining)
Receive data segment of an iSCSI PDU.
Definition: iscsi.c:1654
size_t rx_len
Length of the current RX state.
Definition: iscsi.h:653
static struct iscsi_string_type iscsi_string_types[]
iSCSI text strings that we want to handle
Definition: iscsi.c:1186
#define va_copy(dest, src)
Definition: stdarg.h:10
int base64_decode(const char *encoded, void *data, size_t len)
Base64-decode string.
Definition: base64.c:91
iscsi_rx_state
State of an iSCSI RX engine.
Definition: iscsi.h:532
#define ISCSI_STATUS_TARGET_ERROR_UNAVAILABLE
Definition: iscsi.h:254
uint8_t response
Response code.
Definition: iscsi.h:310
Character types.
void intfs_shutdown(int rc,...)
Shut down multiple object interfaces.
Definition: interface.c:326
static int iscsi_large_binary_decode(const char *encoded, uint8_t *raw, size_t len)
Decode large binary value.
Definition: iscsi.c:856
union scsi_cdb cdb
CDB for this command.
Definition: scsi.h:253
uint32_t statsn
Status sequence number.
Definition: iscsi.h:130
static int iscsi_rx_login_response(struct iscsi_session *iscsi, const void *data, size_t len, size_t remaining)
Receive data segment of an iSCSI login response PDU.
Definition: iscsi.c:1320
int scsi_open(struct interface *block, struct interface *scsi, struct scsi_lun *lun)
Open SCSI device.
Definition: scsi.c:984
#define ISCSI_STATUS_OPERATIONAL_NEGOTIATION_PHASE
iSCSI session is currently in the operational parameter negotiation phase
Definition: iscsi.h:676
Uniform Resource Identifiers.
#define ISCSI_STATUS_INITIATOR_ERROR_NOT_FOUND
Definition: iscsi.h:251
#define ISCSI_OPCODE_DATA_IN
Data-in opcode.
Definition: iscsi.h:386
#define ISCSI_STATUS_INITIATOR_ERROR
Definition: iscsi.h:248
void * rx_buffer
Buffer for received data (not always used)
Definition: iscsi.h:655
int strncmp(const char *first, const char *second, size_t max)
Compare strings.
Definition: string.c:186
void process_del(struct process *process)
Remove process from process list.
Definition: process.c:79
#define ISCSI_OPCODE_LOGIN_REQUEST
Login request opcode.
Definition: iscsi.h:173
static void iscsi_start_login(struct iscsi_session *iscsi)
Build iSCSI login request BHS.
Definition: iscsi.c:771
#define EINVAL_NO_TARGET_IQN
Definition: iscsi.c:82
Access to external ("user") memory.
#define htonl(value)
Definition: byteswap.h:133
struct iscsi_bhs_r2t r2t
Definition: iscsi.h:514
size_t xfer_window(struct interface *intf)
Check flow control window.
Definition: xfer.c:116
#define ISCSI_DATA_LEN(segment_lengths)
The length of the data segment, in bytes, excluding any padding.
Definition: iscsi.h:61
uint8_t status
SCSI status code.
Definition: iscsi.h:312
iSCSI SCSI command basic header segment
Definition: iscsi.h:261
#define ISCSI_STATUS_SECURITY_NEGOTIATION_PHASE
iSCSI session is currently in the security negotiation phase
Definition: iscsi.h:669
static int iscsi_handle_chap_n_value(struct iscsi_session *iscsi, const char *value)
Handle iSCSI CHAP_N text value.
Definition: iscsi.c:1074
#define ECANCELED
Operation canceled.
Definition: errno.h:343
int xfer_deliver_raw(struct interface *intf, const void *data, size_t len)
Deliver datagram as raw data without metadata.
Definition: xfer.c:288
static int iscsi_rx_r2t(struct iscsi_session *iscsi, const void *data __unused, size_t len __unused, size_t remaining __unused)
Receive data segment of an iSCSI R2T PDU.
Definition: iscsi.c:507
uint32_t statsn
Status sequence number.
Definition: iscsi.h:637
Data transfer interfaces.
A reference counter.
Definition: refcnt.h:26
unsigned int target_port
Target port.
Definition: iscsi.h:560
struct scsi_lun lun
Logical Unit Number.
Definition: iscsi.h:414
char * initiator_password
Initiator password (if any)
Definition: iscsi.h:574
const char * name
Name.
Definition: settings.h:28
static void const void size_t key_len
Definition: crypto.h:285
#define EACCES_INCORRECT_TARGET_USERNAME
Definition: iscsi.c:62
uint8_t status_detail
Status detail.
Definition: iscsi.h:237
iscsi_root_path_component
iSCSI root path components (as per RFC4173)
Definition: iscsi.c:1965
static size_t base16_encoded_len(size_t raw_len)
Calculate length of base16-encoded data.
Definition: base16.h:21
int ssnprintf(char *buf, ssize_t ssize, const char *fmt,...)
Version of vsnprintf() that accepts a signed buffer size.
Definition: vsprintf.c:420
unsigned long tmp
Definition: linux_pci.h:53
static int iscsi_vredirect(struct iscsi_session *iscsi, int type, va_list args)
Handle redirection event.
Definition: iscsi.c:1782
static struct interface_operation iscsi_socket_operations[]
iSCSI socket interface operations
Definition: iscsi.c:1814
#define ISCSI_LOGIN_FLAG_TRANSITION
Willingness to transition to next stage.
Definition: iscsi.h:176
static int iscsi_tx_login_request(struct iscsi_session *iscsi)
Transmit data segment of an iSCSI login request PDU.
Definition: iscsi.c:830
#define ISCSI_STATUS_PHASE_MASK
Mask for all iSCSI session phases.
Definition: iscsi.h:684
#define ENOMEM
Not enough space.
Definition: errno.h:534
size_t rx_offset
Byte offset within the current RX state.
Definition: iscsi.h:651
unsigned char bytes[sizeof(struct iscsi_bhs_common)]
Definition: iscsi.h:516
void * memcpy(void *dest, const void *src, size_t len) __nonnull
static int iscsi_tx_nothing(struct iscsi_session *iscsi __unused)
Transmit nothing.
Definition: iscsi.c:1459
#define va_arg(ap, type)
Definition: stdarg.h:8
static int iscsi_tx_bhs(struct iscsi_session *iscsi)
Transmit basic header segment of an iSCSI PDU.
Definition: iscsi.c:1469
Nothing to send.
Definition: iscsi.h:522
struct interface control
SCSI command-issuing interface.
Definition: iscsi.h:549
static int iscsi_tx_data(struct iscsi_session *iscsi)
Transmit data segment of an iSCSI PDU.
Definition: iscsi.c:1483
An iSCSI text string that we want to handle.
Definition: iscsi.c:1169
#define IANA_EN_FEN_SYSTEMS
Fen Systems Ltd.
Definition: iscsi.h:201
static void iscsi_tx_pause(struct iscsi_session *iscsi)
Pause TX engine.
Definition: iscsi.c:1418
Assertions.
assert((readw(&hdr->flags) &(GTF_reading|GTF_writing))==0)
A SCSI command.
Definition: scsi.c:262
#define ISCSI_MAX_BURST_LEN
Default iSCSI maximum burst length.
Definition: iscsi.h:29
#define container_of(ptr, type, field)
Get containing structure.
Definition: stddef.h:35
#define ISCSI_STATUS_INITIATOR_ERROR_AUTHORISATION
Definition: iscsi.h:250
An object interface.
Definition: interface.h:124
int scsi_parse_lun(const char *lun_string, struct scsi_lun *lun)
Parse SCSI LUN.
Definition: scsi.c:117
uint32_t itt
Initiator task tag.
Definition: iscsi.h:603
uint32_t datasn
Data sequence number.
Definition: iscsi.h:426
A SCSI response information unit.
Definition: scsi.h:322
static int iscsi_open(struct interface *parent, struct uri *uri)
Open iSCSI URI.
Definition: iscsi.c:2174
Receiving the data segment padding.
Definition: iscsi.h:540
uint8_t status_class
Status class.
Definition: iscsi.h:235
userptr_t data_out
Data-out buffer (may be NULL)
Definition: scsi.h:255
static void iscsi_data_out_done(struct iscsi_session *iscsi)
Complete iSCSI data-out PDU transmission.
Definition: iscsi.c:566
static void iscsi_command_close(struct iscsi_session *iscsi, int rc)
Close iSCSI command.
Definition: iscsi.c:1937
int chap_init(struct chap_response *chap, struct digest_algorithm *digest)
Initialise CHAP challenge/response.
Definition: chap.c:51
int status
Session status.
Definition: iscsi.h:569
iSCSI protocol
static int tolower(int character)
Convert character to lower case.
Definition: ctype.h:108
static userptr_t size_t offset
Offset of the first segment within the content.
Definition: deflate.h:259
const char * scheme
URI protocol name.
Definition: open.h:53
Transport-network layer interface.
#define ISCSI_FLAG_FINAL
Final PDU of a sequence.
Definition: iscsi.h:102
static void iscsi_close_connection(struct iscsi_session *iscsi, int rc)
Close iSCSI transport-layer connection.
Definition: iscsi.c:307
Feature list.
uint32_t ttt
Target Transfer Tag.
Definition: iscsi.h:418
struct acpi_descriptor desc
ACPI descriptor.
Definition: iscsi.h:665
static void iscsi_close(struct iscsi_session *iscsi, int rc)
Shut down iSCSI interface.
Definition: iscsi.c:224
#define EACCES_INCORRECT_TARGET_PASSWORD
Definition: iscsi.c:66
union iscsi_bhs tx_bhs
Basic header segment for current TX PDU.
Definition: iscsi.h:640
struct scsi_lun lun
LUN.
Definition: scsi.h:251
#define ISCSI_FIRST_BURST_LEN
Default iSCSI first burst length.
Definition: iscsi.h:26
int fetch_string_setting_copy(struct settings *settings, const struct setting *setting, char **data)
Fetch value of string setting.
Definition: settings.c:873
#define ISCSI_OPCODE_NOP_IN
NOP-In opcode.
Definition: iscsi.h:500
#define ISCSI_LOGIN_CSG_SECURITY_NEGOTIATION
Definition: iscsi.h:183
static void iscsi_scsi_capacity(struct iscsi_session *iscsi, struct block_device_capacity *capacity)
Update SCSI block device capacity.
Definition: iscsi.c:1894
static int iscsi_handle_authmethod_value(struct iscsi_session *iscsi, const char *value)
Handle iSCSI AuthMethod text value.
Definition: iscsi.c:909
static struct interface_descriptor iscsi_control_desc
iSCSI SCSI command-issuing interface descriptor
Definition: iscsi.c:1928
iSCSI basic header segment common request fields
Definition: iscsi.h:114
#define EPROTO
Protocol error.
Definition: errno.h:624
pseudo_bit_t value[0x00020]
Definition: arbel.h:13
#define EPROTO_INVALID_KEY_VALUE_PAIR
Definition: iscsi.c:142
#define ISCSI_STATUS_STRINGS_CHAP_ALGORITHM
iSCSI session needs to send the CHAP_A string
Definition: iscsi.h:690
void process_add(struct process *process)
Add process to process list.
Definition: process.c:59
int meta(WINDOW *, bool)
static int iscsi_handle_chap_r_value(struct iscsi_session *iscsi, const char *value)
Handle iSCSI CHAP_R text value.
Definition: iscsi.c:1103
Configuration settings.
#define EFI_INTF_OP
Definition: efi.h:350
uint16_t st_port
TCP/IP port.
Definition: tcpip.h:81
Generalized socket address structure.
Definition: socket.h:96
uint64_t rsp
Definition: librm.h:267
Receiving the additional header segment.
Definition: iscsi.h:536
An object interface descriptor.
Definition: interface.h:55
static int iscsi_rx_buffered_data(struct iscsi_session *iscsi, const void *data, size_t len)
Receive PDU data into buffer.
Definition: iscsi.c:179
static struct process_descriptor iscsi_process_desc
iSCSI TX process descriptor
Definition: iscsi.c:1598
static void iscsi_rx_buffered_data_done(struct iscsi_session *iscsi)
Finish receiving PDU data into buffer.
Definition: iscsi.c:161
#define ISCSI_PORT
Default iSCSI port.
Definition: iscsi.h:23
uint32_t offset
Buffer offset.
Definition: iscsi.h:464
iSCSI basic header segment common fields
Definition: iscsi.h:78
Block devices.
char * strerror(int errno)
Retrieve string representation of error number.
Definition: strerror.c:78
static void(* free)(struct refcnt *refcnt))
Definition: refcnt.h:54
void chap_finish(struct chap_response *chap)
Free resources used by a CHAP response.
Definition: chap.c:122
struct scsi_lun lun
SCSI LUN (for boot firmware table)
Definition: iscsi.h:663
void * zalloc(size_t size)
Allocate cleared memory.
Definition: malloc.c:624
struct process process
TX process.
Definition: iscsi.h:644
static int iscsi_handle_string(struct iscsi_session *iscsi, const char *string)
Handle iSCSI string.
Definition: iscsi.c:1205
#define EINVAL_NO_INITIATOR_IQN
Definition: iscsi.c:86
union iscsi_segment_lengths lengths
Segment lengths.
Definition: iscsi.h:314
enum iscsi_rx_state rx_state
State of the RX engine.
Definition: iscsi.h:649
char * strchr(const char *src, int character)
Find character within a string.
Definition: string.c:271
uint32_t offset
Buffer offset.
Definition: iscsi.h:428
uint8_t flags
Flags.
Definition: iscsi.h:408
Location is a socket.
Definition: open.h:43
static size_t iob_len(struct io_buffer *iobuf)
Calculate length of data in an I/O buffer.
Definition: iobuf.h:155
int asprintf(char **strp, const char *fmt,...)
Write a formatted string to newly allocated memory.
Definition: asprintf.c:41
#define INTF_OP(op_type, object_type, op_func)
Define an object interface operation.
Definition: interface.h:32
static __always_inline void copy_to_user(userptr_t dest, off_t dest_off, const void *src, size_t len)
Copy data to user buffer.
Definition: uaccess.h:324
char * strdup(const char *src)
Duplicate string.
Definition: string.c:380
uint32_t control
Control.
Definition: myson.h:14
iSCSI request to transfer basic header segment
Definition: iscsi.h:440
char * target_address
Target address.
Definition: iscsi.h:558
#define ISCSI_STATUS_STRINGS_MASK
Mask for all iSCSI "needs to send" flags.
Definition: iscsi.h:702
iSCSI login response basic header segment
Definition: iscsi.h:207
#define EOPNOTSUPP
Operation not supported on socket.
Definition: errno.h:604
#define ISCSI_OPCODE_R2T
R2T opcode.
Definition: iscsi.h:470
#define ISCSI_AHS_LEN(segment_lengths)
The length of the additional header segment, in dwords.
Definition: iscsi.h:57
long int random(void)
Generate a pseudo-random number between 0 and 2147483647L or 2147483562?
Definition: random.c:31
struct chap_response chap
CHAP response (used for both initiator and target auth)
Definition: iscsi.h:587
#define ISCSI_LOGIN_CSG_MASK
Definition: iscsi.h:182
static int iscsi_socket_deliver(struct iscsi_session *iscsi, struct io_buffer *iobuf, struct xfer_metadata *meta __unused)
Receive new data.
Definition: iscsi.c:1698
#define ENODEV
No such device.
Definition: errno.h:509
#define SOCK_STREAM
Definition: socket.h:24
#define EIO_TARGET_UNAVAILABLE
Definition: iscsi.c:94
int xfer_deliver(struct interface *intf, struct io_buffer *iobuf, struct xfer_metadata *meta)
Deliver datagram.
Definition: xfer.c:194
size_t strlen(const char *src)
Get length of string.
Definition: string.c:243
#define EINVAL_ROOT_PATH_TOO_SHORT
Definition: iscsi.c:70
Processes.
static void iscsi_scsi_done(struct iscsi_session *iscsi, int rc, struct scsi_rsp *rsp)
Mark iSCSI SCSI operation as complete.
Definition: iscsi.c:339
unsigned char uint8_t
Definition: stdint.h:10
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)
#define ISCSI_STATUS_STRINGS_CHAP_CHALLENGE
iSCSI session needs to send the mutual CHAP challenge
Definition: iscsi.h:696
#define SCSI_CDB_DATA(cdb)
printf() parameters for dumping a scsi_cdb
Definition: scsi.h:223
Data transfer interface opening.
EFI device paths.
uint8_t flags
Flags.
Definition: iscsi.h:211
static int iscsi_check_auth(struct iscsi_session *iscsi)
Check iSCSI authentication details.
Definition: iscsi.c:2143
size_t response_len
Length of CHAP response.
Definition: chap.h:26
uint8_t flags
Flags.
Definition: iscsi.h:358
size_t strnlen(const char *src, size_t max)
Get length of string.
Definition: string.c:255
int(* handle)(struct iscsi_session *iscsi, const char *value)
Handle iSCSI string value.
Definition: iscsi.c:1182
Sending the additional header segment.
Definition: iscsi.h:526
static int iscsi_rx_nop_in(struct iscsi_session *iscsi, const void *data __unused, size_t len __unused, size_t remaining __unused)
Receive data segment of an iSCSI NOP-In.
Definition: iscsi.c:617
static void process_init_stopped(struct process *process, struct process_descriptor *desc, struct refcnt *refcnt)
Initialise process without adding to process list.
Definition: process.h:145
static struct acpi_descriptor * iscsi_describe(struct iscsi_session *iscsi)
Get iSCSI ACPI descriptor.
Definition: iscsi.c:1912
struct interface data
SCSI command interface.
Definition: iscsi.h:551
unsigned int uint32_t
Definition: stdint.h:12
struct acpi_descriptor * acpi_describe(struct interface *intf)
Get object's ACPI descriptor.
Definition: acpi.c:313
void * malloc(size_t size)
Allocate memory.
Definition: malloc.c:583
#define DHCP_EB_REVERSE_PASSWORD
Reverse password.
Definition: dhcp.h:512
uint16_t isid_iana_qual
Initiator session ID (IANA format) qualifier.
Definition: iscsi.h:597
const char * uuid_ntoa(const union uuid *uuid)
Convert UUID to printable string.
Definition: uuid.c:43
struct ib_cm_common common
Definition: ib_mad.h:11
#define ISCSI_STATUS_STRINGS_CHAP_RESPONSE
iSCSI session needs to send the CHAP response
Definition: iscsi.h:693
uint32_t len
Desired data transfer length.
Definition: iscsi.h:466
EFI_DEVICE_PATH_PROTOCOL * efi_iscsi_path(struct iscsi_session *iscsi)
Construct EFI device path for iSCSI device.
Definition: efi_path.c:290
unsigned char chap_challenge[17]
CHAP challenge (for target auth only)
Definition: iscsi.h:585
size_t max_burst_len
Maximum burst length.
Definition: iscsi.h:590
int xfer_vreopen(struct interface *intf, int type, va_list args)
Reopen location.
Definition: open.c:224
static void iscsi_free(struct refcnt *refcnt)
Free iSCSI session.
Definition: iscsi.c:201
A setting.
Definition: settings.h:23
union iscsi_segment_lengths lengths
Segment lengths.
Definition: iscsi.h:86
static int iscsi_status_to_rc(unsigned int status_class, unsigned int status_detail)
Convert iSCSI response status to return status code.
Definition: iscsi.c:1282
const char * key
String key.
Definition: iscsi.c:1175
Base64 encoding.
uint32_t transfer_offset
Transfer offset.
Definition: iscsi.h:615
#define __unused
Declare a variable or data structure as unused.
Definition: compiler.h:573
void scsi_response(struct interface *intf, struct scsi_rsp *response)
Report SCSI response.
Definition: scsi.c:206
#define ISCSI_COMMAND_ATTR_SIMPLE
Definition: iscsi.h:295
#define ISCSI_STATUS_REDIRECT
Definition: iscsi.h:247
long pad_len
Definition: bigint.h:30
SCSI devices.
A SCSI command information unit.
Definition: scsi.h:249
#define INTF_DESC(object_type, intf, operations)
Define an object interface descriptor.
Definition: interface.h:80
An ACPI descriptor (used to construct ACPI tables)
Definition: acpi.h:278
uint8_t opcode
Opcode.
Definition: iscsi.h:80
iSCSI data-out basic header segment
Definition: iscsi.h:404
char * target_iqn
Target IQN.
Definition: iscsi.h:562
#define ISCSI_LOGIN_NSG_OPERATIONAL_NEGOTIATION
Definition: iscsi.h:190
#define ISCSI_FLAG_IMMEDIATE
Immediate delivery.
Definition: iscsi.h:99
uint32_t expstatsn
Expected status sequence number.
Definition: iscsi.h:422
uint32_t transfer_len
Transfer length.
Definition: iscsi.h:621
iSCSI boot firmware table
struct iscsi_nop_in nop_in
Definition: iscsi.h:515
EFI_DEVICE_PATH_PROTOCOL * efi_describe(struct interface *intf)
Describe object as an EFI device path.
Definition: efi_path.c:537
static void chap_set_identifier(struct chap_response *chap, unsigned int identifier)
Add identifier data to the CHAP challenge.
Definition: chap.h:46
#define SCSI_CDB_FORMAT
printf() format for dumping a scsi_cdb
Definition: scsi.h:219
#define ISCSI_STATUS_AUTH_REVERSE_OK
Target authenticated itself correctly.
Definition: iscsi.h:711
struct iscsi_bhs_login_response login_response
Definition: iscsi.h:509
uint32_t len
Length.
Definition: ena.h:14
Block device capacity.
Definition: blockdev.h:18
#define ISCSI_MAX_RECV_DATA_SEG_LEN
Default iSCSI maximum receive data segment length.
Definition: iscsi.h:32
const char * opaque
Opaque part.
Definition: uri.h:70
#define DBGC2(...)
Definition: compiler.h:522
struct uri_opener iscsi_uri_opener __uri_opener
iSCSI URI opener
Definition: iscsi.c:2256
#define ISCSI_STATUS_STRINGS_SECURITY
iSCSI session needs to send the initial security negotiation strings
Definition: iscsi.h:687
static int iscsi_rx_discard(struct iscsi_session *iscsi __unused, const void *data __unused, size_t len __unused, size_t remaining __unused)
Discard portion of an iSCSI PDU.
Definition: iscsi.c:1635
__builtin_va_list va_list
Definition: stdarg.h:6
int strcmp(const char *first, const char *second)
Compare strings.
Definition: string.c:173
static int iscsi_rx_data_in(struct iscsi_session *iscsi, const void *data, size_t len, size_t remaining)
Receive data segment of an iSCSI data-in PDU.
Definition: iscsi.c:470
uint32_t cmdsn
Command sequence number.
Definition: iscsi.h:629
static void iscsi_login_request_done(struct iscsi_session *iscsi)
Complete iSCSI login request PDU transmission.
Definition: iscsi.c:813
uint32_t itt
Initiator Task Tag.
Definition: iscsi.h:416
void * data
Start of data.
Definition: iobuf.h:48
#define PROC_DESC(object_type, process, _step)
Define a process descriptor.
Definition: process.h:82
#define ISCSI_TAG_MAGIC
iSCSI tag magic marker
Definition: iscsi.h:105
#define EIO
Input/output error.
Definition: errno.h:433
userptr_t data_in
Data-in buffer (may be NULL)
Definition: scsi.h:262
u8 rx[WPA_TKIP_MIC_KEY_LEN]
MIC key for packets from the AP.
Definition: wpa.h:234
u8 request[0]
List of IEs requested.
Definition: ieee80211.h:16
static void iscsi_tx_step(struct iscsi_session *iscsi)
Transmit iSCSI PDU.
Definition: iscsi.c:1534
uint32_t ttt
Target Transfer Tag.
Definition: iscsi.h:454
static int iscsi_handle_targetaddress_value(struct iscsi_session *iscsi, const char *value)
Handle iSCSI TargetAddress text value.
Definition: iscsi.c:879
#define ENOTSUP_INITIATOR_STATUS
Definition: iscsi.c:102
#define ISCSI_OPCODE_LOGIN_RESPONSE
Login response opcode.
Definition: iscsi.h:243
#define DHCP_EB_REVERSE_USERNAME
Reverse username.
Definition: dhcp.h:503
uint32_t end
Ending offset.
Definition: netvsc.h:18
static int iscsi_open_connection(struct iscsi_session *iscsi)
Open iSCSI transport-layer connection.
Definition: iscsi.c:257
uint8_t data[48]
Additional event data.
Definition: ena.h:22
#define ENOTSUP_TARGET_STATUS
Definition: iscsi.c:114
uint32_t residual_count
Residual count.
Definition: iscsi.h:332
#define ISCSI_SET_LENGTHS(segment_lengths, ahs_len, data_len)
Set additional header and data segment lengths.
Definition: iscsi.h:69
static int iscsi_handle_chap_i_value(struct iscsi_session *iscsi, const char *value)
Handle iSCSI CHAP_I text value.
Definition: iscsi.c:978
#define ISCSI_OPCODE_DATA_OUT
Data-out opcode.
Definition: iscsi.h:434
#define EPERM_INITIATOR_AUTHORISATION
Definition: iscsi.c:122
iSCSI SCSI response basic header segment
Definition: iscsi.h:304
#define EIO_TARGET_NO_RESOURCES
Definition: iscsi.c:98
__be32 raw[7]
Definition: CIB_PRM.h:28
static struct interface_descriptor iscsi_socket_desc
iSCSI socket interface descriptor
Definition: iscsi.c:1823
union iscsi_bhs rx_bhs
Basic header segment for current RX PDU.
Definition: iscsi.h:647
A Uniform Resource Identifier.
Definition: uri.h:64
uint8_t opcode
Opcode.
Definition: iscsi.h:406
#define EPROTO_INVALID_CHAP_IDENTIFIER
Definition: iscsi.c:130
#define ISCSI_RESPONSE_COMMAND_COMPLETE
SCSI command completed at target.
Definition: iscsi.h:339
int fetch_uuid_setting(struct settings *settings, const struct setting *setting, union uuid *uuid)
Fetch value of UUID setting.
Definition: settings.c:1084
char * initiator_iqn
Initiator IQN.
Definition: iscsi.h:556
Sending the data segment.
Definition: iscsi.h:528
#define ISCSI_DEFAULT_IQN_PREFIX
Default initiator IQN prefix.
Definition: iscsi.h:714
struct mschapv2_challenge peer
Peer challenge.
Definition: mschapv2.h:12
static int iscsi_handle_maxburstlength_value(struct iscsi_session *iscsi, const char *value)
Handle iSCSI MaxBurstLength text value.
Definition: iscsi.c:930
static struct interface_operation iscsi_control_op[]
iSCSI SCSI command-issuing interface operations
Definition: iscsi.c:1918
struct iscsi_bhs_scsi_response scsi_response
Definition: iscsi.h:511
#define SETTING_AUTH_EXTRA
Authentication additional settings.
Definition: settings.h:78
#define ISCSI_STATUS_STRINGS_OPERATIONAL
iSCSI session needs to send the operational negotiation strings
Definition: iscsi.h:699
static void iscsi_tx_resume(struct iscsi_session *iscsi)
Resume TX engine.
Definition: iscsi.c:1427
#define ISCSI_ISID_IANA
ISID IANA format marker.
Definition: iscsi.h:194
#define ISCSI_OPCODE_SCSI_COMMAND
SCSI command opcode.
Definition: iscsi.h:285
static int iscsi_handle_strings(struct iscsi_session *iscsi, const char *strings, size_t len)
Handle iSCSI strings.
Definition: iscsi.c:1255
char * target_password
Target password (if any)
Definition: iscsi.h:578
#define EPERM_INITIATOR_AUTHENTICATION
Definition: iscsi.c:118
#define EINVAL_MAXBURSTLENGTH
Definition: iscsi.c:90
struct scsi_cmd * command
Current SCSI command, if any.
Definition: iscsi.h:658
static void intf_init(struct interface *intf, struct interface_descriptor *desc, struct refcnt *refcnt)
Initialise an object interface.
Definition: interface.h:203
Socket addresses.
A URI opener.
Definition: open.h:47
char * target_username
Target username (if any)
Definition: iscsi.h:576
Sending the basic header segment.
Definition: iscsi.h:524
static struct interface_operation iscsi_data_op[]
iSCSI SCSI command interface operations
Definition: iscsi.c:1950
Receiving the basic header segment.
Definition: iscsi.h:534
uint32_t ttt
Target Transfer Tag.
Definition: iscsi.h:488
int memcmp(const void *first, const void *second, size_t len)
Compare memory regions.
Definition: string.c:114
#define ISCSI_STATUS_AUTH_FORWARD_REQUIRED
Target has requested forward (initiator) authentication.
Definition: iscsi.h:705
void chap_update(struct chap_response *chap, const void *data, size_t len)
Add data to the CHAP challenge.
Definition: chap.c:85
static int iscsi_build_login_request_strings(struct iscsi_session *iscsi, void *data, size_t len)
Build iSCSI login request strings.
Definition: iscsi.c:692
#define NULL
NULL pointer (VOID *)
Definition: Base.h:321
static void iscsi_start_command(struct iscsi_session *iscsi)
Build iSCSI SCSI command BHS.
Definition: iscsi.c:377
struct iscsi_bhs_data_in data_in
Definition: iscsi.h:512
String functions.
#define htons(value)
Definition: byteswap.h:135
struct bofm_section_header done
Definition: bofm_test.c:46
static void iscsi_start_tx(struct iscsi_session *iscsi)
Start up a new TX PDU.
Definition: iscsi.c:1439
enum iscsi_tx_state tx_state
State of the TX engine.
Definition: iscsi.h:642
int xfer_open_named_socket(struct interface *xfer, int semantics, struct sockaddr *peer, const char *name, struct sockaddr *local)
Open named socket.
Definition: resolv.c:402
struct digest_algorithm md5_algorithm
MD5 algorithm.
Definition: md5.c:286
#define ref_put(refcnt)
Drop reference to object.
Definition: refcnt.h:106
size_t blksize
Block size.
Definition: blockdev.h:22
static void acpi_init(struct acpi_descriptor *desc, struct acpi_model *model, struct refcnt *refcnt)
Initialise ACPI descriptor.
Definition: acpi.h:295
u8 tx[WPA_TKIP_MIC_KEY_LEN]
MIC key for packets to the AP.
Definition: wpa.h:237
#define EINVAL_NO_ROOT_PATH
Definition: iscsi.c:78
#define ENOTSUP_OPCODE
Definition: iscsi.c:106
struct refcnt refcnt
Reference counter.
Definition: iscsi.h:546
void * memset(void *dest, int character, size_t len) __nonnull
#define ISCSI_LOGIN_NSG_FULL_FEATURE_PHASE
Definition: iscsi.h:191
static struct interface_descriptor iscsi_data_desc
iSCSI SCSI command interface descriptor
Definition: iscsi.c:1955
static size_t iscsi_scsi_window(struct iscsi_session *iscsi)
Check iSCSI flow-control window.
Definition: iscsi.c:1838
#define ISCSI_STATUS_TARGET_ERROR
Definition: iscsi.h:253
Base16 encoding.
A persistent I/O buffer.
Definition: iobuf.h:33
#define EPROTO_INVALID_LARGE_BINARY
Definition: iscsi.c:134
#define EPROTO_VALUE_REJECTED
Definition: iscsi.c:146
static int iscsi_scsi_command(struct iscsi_session *iscsi, struct interface *parent, struct scsi_cmd *command)
Issue iSCSI SCSI command.
Definition: iscsi.c:1858