1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains main functions related to iSCSI Parameter negotiation.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <linux/slab.h>
12 #include <linux/uio.h> /* struct kvec */
13 #include <target/iscsi/iscsi_target_core.h>
14 #include "iscsi_target_util.h"
15 #include "iscsi_target_parameters.h"
16
iscsi_login_rx_data(struct iscsi_conn * conn,char * buf,int length)17 int iscsi_login_rx_data(
18 struct iscsi_conn *conn,
19 char *buf,
20 int length)
21 {
22 int rx_got;
23 struct kvec iov;
24
25 memset(&iov, 0, sizeof(struct kvec));
26 iov.iov_len = length;
27 iov.iov_base = buf;
28
29 rx_got = rx_data(conn, &iov, 1, length);
30 if (rx_got != length) {
31 pr_err("rx_data returned %d, expecting %d.\n",
32 rx_got, length);
33 return -1;
34 }
35
36 return 0 ;
37 }
38
iscsi_login_tx_data(struct iscsi_conn * conn,char * pdu_buf,char * text_buf,int text_length)39 int iscsi_login_tx_data(
40 struct iscsi_conn *conn,
41 char *pdu_buf,
42 char *text_buf,
43 int text_length)
44 {
45 int length, tx_sent, iov_cnt = 1;
46 struct kvec iov[2];
47
48 length = (ISCSI_HDR_LEN + text_length);
49
50 memset(&iov[0], 0, 2 * sizeof(struct kvec));
51 iov[0].iov_len = ISCSI_HDR_LEN;
52 iov[0].iov_base = pdu_buf;
53
54 if (text_buf && text_length) {
55 iov[1].iov_len = text_length;
56 iov[1].iov_base = text_buf;
57 iov_cnt++;
58 }
59
60 tx_sent = tx_data(conn, &iov[0], iov_cnt, length);
61 if (tx_sent != length) {
62 pr_err("tx_data returned %d, expecting %d.\n",
63 tx_sent, length);
64 return -1;
65 }
66
67 return 0;
68 }
69
iscsi_dump_conn_ops(struct iscsi_conn_ops * conn_ops)70 void iscsi_dump_conn_ops(struct iscsi_conn_ops *conn_ops)
71 {
72 pr_debug("HeaderDigest: %s\n", (conn_ops->HeaderDigest) ?
73 "CRC32C" : "None");
74 pr_debug("DataDigest: %s\n", (conn_ops->DataDigest) ?
75 "CRC32C" : "None");
76 pr_debug("MaxRecvDataSegmentLength: %u\n",
77 conn_ops->MaxRecvDataSegmentLength);
78 }
79
iscsi_dump_sess_ops(struct iscsi_sess_ops * sess_ops)80 void iscsi_dump_sess_ops(struct iscsi_sess_ops *sess_ops)
81 {
82 pr_debug("InitiatorName: %s\n", sess_ops->InitiatorName);
83 pr_debug("InitiatorAlias: %s\n", sess_ops->InitiatorAlias);
84 pr_debug("TargetName: %s\n", sess_ops->TargetName);
85 pr_debug("TargetAlias: %s\n", sess_ops->TargetAlias);
86 pr_debug("TargetPortalGroupTag: %hu\n",
87 sess_ops->TargetPortalGroupTag);
88 pr_debug("MaxConnections: %hu\n", sess_ops->MaxConnections);
89 pr_debug("InitialR2T: %s\n",
90 (sess_ops->InitialR2T) ? "Yes" : "No");
91 pr_debug("ImmediateData: %s\n", (sess_ops->ImmediateData) ?
92 "Yes" : "No");
93 pr_debug("MaxBurstLength: %u\n", sess_ops->MaxBurstLength);
94 pr_debug("FirstBurstLength: %u\n", sess_ops->FirstBurstLength);
95 pr_debug("DefaultTime2Wait: %hu\n", sess_ops->DefaultTime2Wait);
96 pr_debug("DefaultTime2Retain: %hu\n",
97 sess_ops->DefaultTime2Retain);
98 pr_debug("MaxOutstandingR2T: %hu\n",
99 sess_ops->MaxOutstandingR2T);
100 pr_debug("DataPDUInOrder: %s\n",
101 (sess_ops->DataPDUInOrder) ? "Yes" : "No");
102 pr_debug("DataSequenceInOrder: %s\n",
103 (sess_ops->DataSequenceInOrder) ? "Yes" : "No");
104 pr_debug("ErrorRecoveryLevel: %hu\n",
105 sess_ops->ErrorRecoveryLevel);
106 pr_debug("SessionType: %s\n", (sess_ops->SessionType) ?
107 "Discovery" : "Normal");
108 }
109
iscsi_print_params(struct iscsi_param_list * param_list)110 void iscsi_print_params(struct iscsi_param_list *param_list)
111 {
112 struct iscsi_param *param;
113
114 list_for_each_entry(param, ¶m_list->param_list, p_list)
115 pr_debug("%s: %s\n", param->name, param->value);
116 }
117
iscsi_set_default_param(struct iscsi_param_list * param_list,char * name,char * value,u8 phase,u8 scope,u8 sender,u16 type_range,u8 use)118 static struct iscsi_param *iscsi_set_default_param(struct iscsi_param_list *param_list,
119 char *name, char *value, u8 phase, u8 scope, u8 sender,
120 u16 type_range, u8 use)
121 {
122 struct iscsi_param *param = NULL;
123
124 param = kzalloc(sizeof(struct iscsi_param), GFP_KERNEL);
125 if (!param) {
126 pr_err("Unable to allocate memory for parameter.\n");
127 goto out;
128 }
129 INIT_LIST_HEAD(¶m->p_list);
130
131 param->name = kstrdup(name, GFP_KERNEL);
132 if (!param->name) {
133 pr_err("Unable to allocate memory for parameter name.\n");
134 goto out;
135 }
136
137 param->value = kstrdup(value, GFP_KERNEL);
138 if (!param->value) {
139 pr_err("Unable to allocate memory for parameter value.\n");
140 goto out;
141 }
142
143 param->phase = phase;
144 param->scope = scope;
145 param->sender = sender;
146 param->use = use;
147 param->type_range = type_range;
148
149 switch (param->type_range) {
150 case TYPERANGE_BOOL_AND:
151 param->type = TYPE_BOOL_AND;
152 break;
153 case TYPERANGE_BOOL_OR:
154 param->type = TYPE_BOOL_OR;
155 break;
156 case TYPERANGE_0_TO_2:
157 case TYPERANGE_0_TO_3600:
158 case TYPERANGE_0_TO_32767:
159 case TYPERANGE_0_TO_65535:
160 case TYPERANGE_1_TO_65535:
161 case TYPERANGE_2_TO_3600:
162 case TYPERANGE_512_TO_16777215:
163 param->type = TYPE_NUMBER;
164 break;
165 case TYPERANGE_AUTH:
166 case TYPERANGE_DIGEST:
167 param->type = TYPE_VALUE_LIST | TYPE_STRING;
168 break;
169 case TYPERANGE_ISCSINAME:
170 case TYPERANGE_SESSIONTYPE:
171 case TYPERANGE_TARGETADDRESS:
172 case TYPERANGE_UTF8:
173 param->type = TYPE_STRING;
174 break;
175 default:
176 pr_err("Unknown type_range 0x%02x\n",
177 param->type_range);
178 goto out;
179 }
180 list_add_tail(¶m->p_list, ¶m_list->param_list);
181
182 return param;
183 out:
184 if (param) {
185 kfree(param->value);
186 kfree(param->name);
187 kfree(param);
188 }
189
190 return NULL;
191 }
192
193 /* #warning Add extension keys */
iscsi_create_default_params(struct iscsi_param_list ** param_list_ptr)194 int iscsi_create_default_params(struct iscsi_param_list **param_list_ptr)
195 {
196 struct iscsi_param *param = NULL;
197 struct iscsi_param_list *pl;
198
199 pl = kzalloc(sizeof(struct iscsi_param_list), GFP_KERNEL);
200 if (!pl) {
201 pr_err("Unable to allocate memory for"
202 " struct iscsi_param_list.\n");
203 return -ENOMEM;
204 }
205 INIT_LIST_HEAD(&pl->param_list);
206 INIT_LIST_HEAD(&pl->extra_response_list);
207
208 /*
209 * The format for setting the initial parameter definitions are:
210 *
211 * Parameter name:
212 * Initial value:
213 * Allowable phase:
214 * Scope:
215 * Allowable senders:
216 * Typerange:
217 * Use:
218 */
219 param = iscsi_set_default_param(pl, AUTHMETHOD, INITIAL_AUTHMETHOD,
220 PHASE_SECURITY, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
221 TYPERANGE_AUTH, USE_INITIAL_ONLY);
222 if (!param)
223 goto out;
224
225 param = iscsi_set_default_param(pl, HEADERDIGEST, INITIAL_HEADERDIGEST,
226 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
227 TYPERANGE_DIGEST, USE_INITIAL_ONLY);
228 if (!param)
229 goto out;
230
231 param = iscsi_set_default_param(pl, DATADIGEST, INITIAL_DATADIGEST,
232 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
233 TYPERANGE_DIGEST, USE_INITIAL_ONLY);
234 if (!param)
235 goto out;
236
237 param = iscsi_set_default_param(pl, MAXCONNECTIONS,
238 INITIAL_MAXCONNECTIONS, PHASE_OPERATIONAL,
239 SCOPE_SESSION_WIDE, SENDER_BOTH,
240 TYPERANGE_1_TO_65535, USE_LEADING_ONLY);
241 if (!param)
242 goto out;
243
244 param = iscsi_set_default_param(pl, SENDTARGETS, INITIAL_SENDTARGETS,
245 PHASE_FFP0, SCOPE_SESSION_WIDE, SENDER_INITIATOR,
246 TYPERANGE_UTF8, 0);
247 if (!param)
248 goto out;
249
250 param = iscsi_set_default_param(pl, TARGETNAME, INITIAL_TARGETNAME,
251 PHASE_DECLARATIVE, SCOPE_SESSION_WIDE, SENDER_BOTH,
252 TYPERANGE_ISCSINAME, USE_ALL);
253 if (!param)
254 goto out;
255
256 param = iscsi_set_default_param(pl, INITIATORNAME,
257 INITIAL_INITIATORNAME, PHASE_DECLARATIVE,
258 SCOPE_SESSION_WIDE, SENDER_INITIATOR,
259 TYPERANGE_ISCSINAME, USE_INITIAL_ONLY);
260 if (!param)
261 goto out;
262
263 param = iscsi_set_default_param(pl, TARGETALIAS, INITIAL_TARGETALIAS,
264 PHASE_DECLARATIVE, SCOPE_SESSION_WIDE, SENDER_TARGET,
265 TYPERANGE_UTF8, USE_ALL);
266 if (!param)
267 goto out;
268
269 param = iscsi_set_default_param(pl, INITIATORALIAS,
270 INITIAL_INITIATORALIAS, PHASE_DECLARATIVE,
271 SCOPE_SESSION_WIDE, SENDER_INITIATOR, TYPERANGE_UTF8,
272 USE_ALL);
273 if (!param)
274 goto out;
275
276 param = iscsi_set_default_param(pl, TARGETADDRESS,
277 INITIAL_TARGETADDRESS, PHASE_DECLARATIVE,
278 SCOPE_SESSION_WIDE, SENDER_TARGET,
279 TYPERANGE_TARGETADDRESS, USE_ALL);
280 if (!param)
281 goto out;
282
283 param = iscsi_set_default_param(pl, TARGETPORTALGROUPTAG,
284 INITIAL_TARGETPORTALGROUPTAG,
285 PHASE_DECLARATIVE, SCOPE_SESSION_WIDE, SENDER_TARGET,
286 TYPERANGE_0_TO_65535, USE_INITIAL_ONLY);
287 if (!param)
288 goto out;
289
290 param = iscsi_set_default_param(pl, INITIALR2T, INITIAL_INITIALR2T,
291 PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
292 TYPERANGE_BOOL_OR, USE_LEADING_ONLY);
293 if (!param)
294 goto out;
295
296 param = iscsi_set_default_param(pl, IMMEDIATEDATA,
297 INITIAL_IMMEDIATEDATA, PHASE_OPERATIONAL,
298 SCOPE_SESSION_WIDE, SENDER_BOTH, TYPERANGE_BOOL_AND,
299 USE_LEADING_ONLY);
300 if (!param)
301 goto out;
302
303 param = iscsi_set_default_param(pl, MAXXMITDATASEGMENTLENGTH,
304 INITIAL_MAXXMITDATASEGMENTLENGTH,
305 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
306 TYPERANGE_512_TO_16777215, USE_ALL);
307 if (!param)
308 goto out;
309
310 param = iscsi_set_default_param(pl, MAXRECVDATASEGMENTLENGTH,
311 INITIAL_MAXRECVDATASEGMENTLENGTH,
312 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
313 TYPERANGE_512_TO_16777215, USE_ALL);
314 if (!param)
315 goto out;
316
317 param = iscsi_set_default_param(pl, MAXBURSTLENGTH,
318 INITIAL_MAXBURSTLENGTH, PHASE_OPERATIONAL,
319 SCOPE_SESSION_WIDE, SENDER_BOTH,
320 TYPERANGE_512_TO_16777215, USE_LEADING_ONLY);
321 if (!param)
322 goto out;
323
324 param = iscsi_set_default_param(pl, FIRSTBURSTLENGTH,
325 INITIAL_FIRSTBURSTLENGTH,
326 PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
327 TYPERANGE_512_TO_16777215, USE_LEADING_ONLY);
328 if (!param)
329 goto out;
330
331 param = iscsi_set_default_param(pl, DEFAULTTIME2WAIT,
332 INITIAL_DEFAULTTIME2WAIT,
333 PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
334 TYPERANGE_0_TO_3600, USE_LEADING_ONLY);
335 if (!param)
336 goto out;
337
338 param = iscsi_set_default_param(pl, DEFAULTTIME2RETAIN,
339 INITIAL_DEFAULTTIME2RETAIN,
340 PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
341 TYPERANGE_0_TO_3600, USE_LEADING_ONLY);
342 if (!param)
343 goto out;
344
345 param = iscsi_set_default_param(pl, MAXOUTSTANDINGR2T,
346 INITIAL_MAXOUTSTANDINGR2T,
347 PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
348 TYPERANGE_1_TO_65535, USE_LEADING_ONLY);
349 if (!param)
350 goto out;
351
352 param = iscsi_set_default_param(pl, DATAPDUINORDER,
353 INITIAL_DATAPDUINORDER, PHASE_OPERATIONAL,
354 SCOPE_SESSION_WIDE, SENDER_BOTH, TYPERANGE_BOOL_OR,
355 USE_LEADING_ONLY);
356 if (!param)
357 goto out;
358
359 param = iscsi_set_default_param(pl, DATASEQUENCEINORDER,
360 INITIAL_DATASEQUENCEINORDER,
361 PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
362 TYPERANGE_BOOL_OR, USE_LEADING_ONLY);
363 if (!param)
364 goto out;
365
366 param = iscsi_set_default_param(pl, ERRORRECOVERYLEVEL,
367 INITIAL_ERRORRECOVERYLEVEL,
368 PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
369 TYPERANGE_0_TO_2, USE_LEADING_ONLY);
370 if (!param)
371 goto out;
372
373 param = iscsi_set_default_param(pl, SESSIONTYPE, INITIAL_SESSIONTYPE,
374 PHASE_DECLARATIVE, SCOPE_SESSION_WIDE, SENDER_INITIATOR,
375 TYPERANGE_SESSIONTYPE, USE_LEADING_ONLY);
376 if (!param)
377 goto out;
378
379 param = iscsi_set_default_param(pl, IFMARKER, INITIAL_IFMARKER,
380 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
381 TYPERANGE_BOOL_AND, USE_INITIAL_ONLY);
382 if (!param)
383 goto out;
384
385 param = iscsi_set_default_param(pl, OFMARKER, INITIAL_OFMARKER,
386 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
387 TYPERANGE_BOOL_AND, USE_INITIAL_ONLY);
388 if (!param)
389 goto out;
390
391 param = iscsi_set_default_param(pl, IFMARKINT, INITIAL_IFMARKINT,
392 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
393 TYPERANGE_UTF8, USE_INITIAL_ONLY);
394 if (!param)
395 goto out;
396
397 param = iscsi_set_default_param(pl, OFMARKINT, INITIAL_OFMARKINT,
398 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
399 TYPERANGE_UTF8, USE_INITIAL_ONLY);
400 if (!param)
401 goto out;
402
403 /*
404 * Extra parameters for ISER from RFC-5046
405 */
406 param = iscsi_set_default_param(pl, RDMAEXTENSIONS, INITIAL_RDMAEXTENSIONS,
407 PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
408 TYPERANGE_BOOL_AND, USE_LEADING_ONLY);
409 if (!param)
410 goto out;
411
412 param = iscsi_set_default_param(pl, INITIATORRECVDATASEGMENTLENGTH,
413 INITIAL_INITIATORRECVDATASEGMENTLENGTH,
414 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
415 TYPERANGE_512_TO_16777215, USE_ALL);
416 if (!param)
417 goto out;
418
419 param = iscsi_set_default_param(pl, TARGETRECVDATASEGMENTLENGTH,
420 INITIAL_TARGETRECVDATASEGMENTLENGTH,
421 PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
422 TYPERANGE_512_TO_16777215, USE_ALL);
423 if (!param)
424 goto out;
425
426 *param_list_ptr = pl;
427 return 0;
428 out:
429 iscsi_release_param_list(pl);
430 return -1;
431 }
432
iscsi_set_keys_to_negotiate(struct iscsi_param_list * param_list,bool iser)433 int iscsi_set_keys_to_negotiate(
434 struct iscsi_param_list *param_list,
435 bool iser)
436 {
437 struct iscsi_param *param;
438
439 param_list->iser = iser;
440
441 list_for_each_entry(param, ¶m_list->param_list, p_list) {
442 param->state = 0;
443 if (!strcmp(param->name, AUTHMETHOD)) {
444 SET_PSTATE_NEGOTIATE(param);
445 } else if (!strcmp(param->name, HEADERDIGEST)) {
446 if (!iser)
447 SET_PSTATE_NEGOTIATE(param);
448 } else if (!strcmp(param->name, DATADIGEST)) {
449 if (!iser)
450 SET_PSTATE_NEGOTIATE(param);
451 } else if (!strcmp(param->name, MAXCONNECTIONS)) {
452 SET_PSTATE_NEGOTIATE(param);
453 } else if (!strcmp(param->name, TARGETNAME)) {
454 continue;
455 } else if (!strcmp(param->name, INITIATORNAME)) {
456 continue;
457 } else if (!strcmp(param->name, TARGETALIAS)) {
458 if (param->value)
459 SET_PSTATE_NEGOTIATE(param);
460 } else if (!strcmp(param->name, INITIATORALIAS)) {
461 continue;
462 } else if (!strcmp(param->name, TARGETPORTALGROUPTAG)) {
463 SET_PSTATE_NEGOTIATE(param);
464 } else if (!strcmp(param->name, INITIALR2T)) {
465 SET_PSTATE_NEGOTIATE(param);
466 } else if (!strcmp(param->name, IMMEDIATEDATA)) {
467 SET_PSTATE_NEGOTIATE(param);
468 } else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
469 if (!iser)
470 SET_PSTATE_NEGOTIATE(param);
471 } else if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
472 continue;
473 } else if (!strcmp(param->name, MAXBURSTLENGTH)) {
474 SET_PSTATE_NEGOTIATE(param);
475 } else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
476 SET_PSTATE_NEGOTIATE(param);
477 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
478 SET_PSTATE_NEGOTIATE(param);
479 } else if (!strcmp(param->name, DEFAULTTIME2RETAIN)) {
480 SET_PSTATE_NEGOTIATE(param);
481 } else if (!strcmp(param->name, MAXOUTSTANDINGR2T)) {
482 SET_PSTATE_NEGOTIATE(param);
483 } else if (!strcmp(param->name, DATAPDUINORDER)) {
484 SET_PSTATE_NEGOTIATE(param);
485 } else if (!strcmp(param->name, DATASEQUENCEINORDER)) {
486 SET_PSTATE_NEGOTIATE(param);
487 } else if (!strcmp(param->name, ERRORRECOVERYLEVEL)) {
488 SET_PSTATE_NEGOTIATE(param);
489 } else if (!strcmp(param->name, SESSIONTYPE)) {
490 SET_PSTATE_NEGOTIATE(param);
491 } else if (!strcmp(param->name, IFMARKER)) {
492 SET_PSTATE_REJECT(param);
493 } else if (!strcmp(param->name, OFMARKER)) {
494 SET_PSTATE_REJECT(param);
495 } else if (!strcmp(param->name, IFMARKINT)) {
496 SET_PSTATE_REJECT(param);
497 } else if (!strcmp(param->name, OFMARKINT)) {
498 SET_PSTATE_REJECT(param);
499 } else if (!strcmp(param->name, RDMAEXTENSIONS)) {
500 if (iser)
501 SET_PSTATE_NEGOTIATE(param);
502 } else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
503 if (iser)
504 SET_PSTATE_NEGOTIATE(param);
505 } else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
506 if (iser)
507 SET_PSTATE_NEGOTIATE(param);
508 }
509 }
510
511 return 0;
512 }
513
iscsi_set_keys_irrelevant_for_discovery(struct iscsi_param_list * param_list)514 int iscsi_set_keys_irrelevant_for_discovery(
515 struct iscsi_param_list *param_list)
516 {
517 struct iscsi_param *param;
518
519 list_for_each_entry(param, ¶m_list->param_list, p_list) {
520 if (!strcmp(param->name, MAXCONNECTIONS))
521 param->state &= ~PSTATE_NEGOTIATE;
522 else if (!strcmp(param->name, INITIALR2T))
523 param->state &= ~PSTATE_NEGOTIATE;
524 else if (!strcmp(param->name, IMMEDIATEDATA))
525 param->state &= ~PSTATE_NEGOTIATE;
526 else if (!strcmp(param->name, MAXBURSTLENGTH))
527 param->state &= ~PSTATE_NEGOTIATE;
528 else if (!strcmp(param->name, FIRSTBURSTLENGTH))
529 param->state &= ~PSTATE_NEGOTIATE;
530 else if (!strcmp(param->name, MAXOUTSTANDINGR2T))
531 param->state &= ~PSTATE_NEGOTIATE;
532 else if (!strcmp(param->name, DATAPDUINORDER))
533 param->state &= ~PSTATE_NEGOTIATE;
534 else if (!strcmp(param->name, DATASEQUENCEINORDER))
535 param->state &= ~PSTATE_NEGOTIATE;
536 else if (!strcmp(param->name, ERRORRECOVERYLEVEL))
537 param->state &= ~PSTATE_NEGOTIATE;
538 else if (!strcmp(param->name, DEFAULTTIME2WAIT))
539 param->state &= ~PSTATE_NEGOTIATE;
540 else if (!strcmp(param->name, DEFAULTTIME2RETAIN))
541 param->state &= ~PSTATE_NEGOTIATE;
542 else if (!strcmp(param->name, IFMARKER))
543 param->state &= ~PSTATE_NEGOTIATE;
544 else if (!strcmp(param->name, OFMARKER))
545 param->state &= ~PSTATE_NEGOTIATE;
546 else if (!strcmp(param->name, IFMARKINT))
547 param->state &= ~PSTATE_NEGOTIATE;
548 else if (!strcmp(param->name, OFMARKINT))
549 param->state &= ~PSTATE_NEGOTIATE;
550 else if (!strcmp(param->name, RDMAEXTENSIONS))
551 param->state &= ~PSTATE_NEGOTIATE;
552 else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH))
553 param->state &= ~PSTATE_NEGOTIATE;
554 else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH))
555 param->state &= ~PSTATE_NEGOTIATE;
556 }
557
558 return 0;
559 }
560
iscsi_copy_param_list(struct iscsi_param_list ** dst_param_list,struct iscsi_param_list * src_param_list,int leading)561 int iscsi_copy_param_list(
562 struct iscsi_param_list **dst_param_list,
563 struct iscsi_param_list *src_param_list,
564 int leading)
565 {
566 struct iscsi_param *param = NULL;
567 struct iscsi_param *new_param = NULL;
568 struct iscsi_param_list *param_list = NULL;
569
570 param_list = kzalloc(sizeof(struct iscsi_param_list), GFP_KERNEL);
571 if (!param_list) {
572 pr_err("Unable to allocate memory for struct iscsi_param_list.\n");
573 return -ENOMEM;
574 }
575 INIT_LIST_HEAD(¶m_list->param_list);
576 INIT_LIST_HEAD(¶m_list->extra_response_list);
577
578 list_for_each_entry(param, &src_param_list->param_list, p_list) {
579 if (!leading && (param->scope & SCOPE_SESSION_WIDE)) {
580 if ((strcmp(param->name, "TargetName") != 0) &&
581 (strcmp(param->name, "InitiatorName") != 0) &&
582 (strcmp(param->name, "TargetPortalGroupTag") != 0))
583 continue;
584 }
585
586 new_param = kzalloc(sizeof(struct iscsi_param), GFP_KERNEL);
587 if (!new_param) {
588 pr_err("Unable to allocate memory for struct iscsi_param.\n");
589 goto err_out;
590 }
591
592 new_param->name = kstrdup(param->name, GFP_KERNEL);
593 new_param->value = kstrdup(param->value, GFP_KERNEL);
594 if (!new_param->value || !new_param->name) {
595 kfree(new_param->value);
596 kfree(new_param->name);
597 kfree(new_param);
598 pr_err("Unable to allocate memory for parameter name/value.\n");
599 goto err_out;
600 }
601
602 new_param->set_param = param->set_param;
603 new_param->phase = param->phase;
604 new_param->scope = param->scope;
605 new_param->sender = param->sender;
606 new_param->type = param->type;
607 new_param->use = param->use;
608 new_param->type_range = param->type_range;
609
610 list_add_tail(&new_param->p_list, ¶m_list->param_list);
611 }
612
613 if (!list_empty(¶m_list->param_list)) {
614 *dst_param_list = param_list;
615 } else {
616 pr_err("No parameters allocated.\n");
617 goto err_out;
618 }
619
620 return 0;
621
622 err_out:
623 iscsi_release_param_list(param_list);
624 return -ENOMEM;
625 }
626
iscsi_release_extra_responses(struct iscsi_param_list * param_list)627 static void iscsi_release_extra_responses(struct iscsi_param_list *param_list)
628 {
629 struct iscsi_extra_response *er, *er_tmp;
630
631 list_for_each_entry_safe(er, er_tmp, ¶m_list->extra_response_list,
632 er_list) {
633 list_del(&er->er_list);
634 kfree(er);
635 }
636 }
637
iscsi_release_param_list(struct iscsi_param_list * param_list)638 void iscsi_release_param_list(struct iscsi_param_list *param_list)
639 {
640 struct iscsi_param *param, *param_tmp;
641
642 list_for_each_entry_safe(param, param_tmp, ¶m_list->param_list,
643 p_list) {
644 list_del(¶m->p_list);
645
646 kfree(param->name);
647 kfree(param->value);
648 kfree(param);
649 }
650
651 iscsi_release_extra_responses(param_list);
652
653 kfree(param_list);
654 }
655
iscsi_find_param_from_key(char * key,struct iscsi_param_list * param_list)656 struct iscsi_param *iscsi_find_param_from_key(
657 char *key,
658 struct iscsi_param_list *param_list)
659 {
660 struct iscsi_param *param;
661
662 if (!key || !param_list) {
663 pr_err("Key or parameter list pointer is NULL.\n");
664 return NULL;
665 }
666
667 list_for_each_entry(param, ¶m_list->param_list, p_list) {
668 if (!strcmp(key, param->name))
669 return param;
670 }
671
672 pr_err("Unable to locate key \"%s\".\n", key);
673 return NULL;
674 }
675 EXPORT_SYMBOL(iscsi_find_param_from_key);
676
iscsi_extract_key_value(char * textbuf,char ** key,char ** value)677 int iscsi_extract_key_value(char *textbuf, char **key, char **value)
678 {
679 *value = strchr(textbuf, '=');
680 if (!*value) {
681 pr_err("Unable to locate \"=\" separator for key,"
682 " ignoring request.\n");
683 return -1;
684 }
685
686 *key = textbuf;
687 **value = '\0';
688 *value = *value + 1;
689
690 return 0;
691 }
692
iscsi_update_param_value(struct iscsi_param * param,char * value)693 int iscsi_update_param_value(struct iscsi_param *param, char *value)
694 {
695 kfree(param->value);
696
697 param->value = kstrdup(value, GFP_KERNEL);
698 if (!param->value) {
699 pr_err("Unable to allocate memory for value.\n");
700 return -ENOMEM;
701 }
702
703 pr_debug("iSCSI Parameter updated to %s=%s\n",
704 param->name, param->value);
705 return 0;
706 }
707
iscsi_add_notunderstood_response(char * key,char * value,struct iscsi_param_list * param_list)708 static int iscsi_add_notunderstood_response(
709 char *key,
710 char *value,
711 struct iscsi_param_list *param_list)
712 {
713 struct iscsi_extra_response *extra_response;
714
715 if (strlen(value) > VALUE_MAXLEN) {
716 pr_err("Value for notunderstood key \"%s\" exceeds %d,"
717 " protocol error.\n", key, VALUE_MAXLEN);
718 return -1;
719 }
720
721 extra_response = kzalloc(sizeof(struct iscsi_extra_response), GFP_KERNEL);
722 if (!extra_response) {
723 pr_err("Unable to allocate memory for"
724 " struct iscsi_extra_response.\n");
725 return -ENOMEM;
726 }
727 INIT_LIST_HEAD(&extra_response->er_list);
728
729 strlcpy(extra_response->key, key, sizeof(extra_response->key));
730 strlcpy(extra_response->value, NOTUNDERSTOOD,
731 sizeof(extra_response->value));
732
733 list_add_tail(&extra_response->er_list,
734 ¶m_list->extra_response_list);
735 return 0;
736 }
737
iscsi_check_for_auth_key(char * key)738 static int iscsi_check_for_auth_key(char *key)
739 {
740 /*
741 * RFC 1994
742 */
743 if (!strcmp(key, "CHAP_A") || !strcmp(key, "CHAP_I") ||
744 !strcmp(key, "CHAP_C") || !strcmp(key, "CHAP_N") ||
745 !strcmp(key, "CHAP_R"))
746 return 1;
747
748 /*
749 * RFC 2945
750 */
751 if (!strcmp(key, "SRP_U") || !strcmp(key, "SRP_N") ||
752 !strcmp(key, "SRP_g") || !strcmp(key, "SRP_s") ||
753 !strcmp(key, "SRP_A") || !strcmp(key, "SRP_B") ||
754 !strcmp(key, "SRP_M") || !strcmp(key, "SRP_HM"))
755 return 1;
756
757 return 0;
758 }
759
iscsi_check_proposer_for_optional_reply(struct iscsi_param * param,bool keys_workaround)760 static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param,
761 bool keys_workaround)
762 {
763 if (IS_TYPE_BOOL_AND(param)) {
764 if (!strcmp(param->value, NO))
765 SET_PSTATE_REPLY_OPTIONAL(param);
766 } else if (IS_TYPE_BOOL_OR(param)) {
767 if (!strcmp(param->value, YES))
768 SET_PSTATE_REPLY_OPTIONAL(param);
769
770 if (keys_workaround) {
771 /*
772 * Required for gPXE iSCSI boot client
773 */
774 if (!strcmp(param->name, IMMEDIATEDATA))
775 SET_PSTATE_REPLY_OPTIONAL(param);
776 }
777 } else if (IS_TYPE_NUMBER(param)) {
778 if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH))
779 SET_PSTATE_REPLY_OPTIONAL(param);
780
781 if (keys_workaround) {
782 /*
783 * Required for Mellanox Flexboot PXE boot ROM
784 */
785 if (!strcmp(param->name, FIRSTBURSTLENGTH))
786 SET_PSTATE_REPLY_OPTIONAL(param);
787
788 /*
789 * Required for gPXE iSCSI boot client
790 */
791 if (!strcmp(param->name, MAXCONNECTIONS))
792 SET_PSTATE_REPLY_OPTIONAL(param);
793 }
794 } else if (IS_PHASE_DECLARATIVE(param))
795 SET_PSTATE_REPLY_OPTIONAL(param);
796 }
797
iscsi_check_boolean_value(struct iscsi_param * param,char * value)798 static int iscsi_check_boolean_value(struct iscsi_param *param, char *value)
799 {
800 if (strcmp(value, YES) && strcmp(value, NO)) {
801 pr_err("Illegal value for \"%s\", must be either"
802 " \"%s\" or \"%s\".\n", param->name, YES, NO);
803 return -1;
804 }
805
806 return 0;
807 }
808
iscsi_check_numerical_value(struct iscsi_param * param,char * value_ptr)809 static int iscsi_check_numerical_value(struct iscsi_param *param, char *value_ptr)
810 {
811 char *tmpptr;
812 int value = 0;
813
814 value = simple_strtoul(value_ptr, &tmpptr, 0);
815
816 if (IS_TYPERANGE_0_TO_2(param)) {
817 if ((value < 0) || (value > 2)) {
818 pr_err("Illegal value for \"%s\", must be"
819 " between 0 and 2.\n", param->name);
820 return -1;
821 }
822 return 0;
823 }
824 if (IS_TYPERANGE_0_TO_3600(param)) {
825 if ((value < 0) || (value > 3600)) {
826 pr_err("Illegal value for \"%s\", must be"
827 " between 0 and 3600.\n", param->name);
828 return -1;
829 }
830 return 0;
831 }
832 if (IS_TYPERANGE_0_TO_32767(param)) {
833 if ((value < 0) || (value > 32767)) {
834 pr_err("Illegal value for \"%s\", must be"
835 " between 0 and 32767.\n", param->name);
836 return -1;
837 }
838 return 0;
839 }
840 if (IS_TYPERANGE_0_TO_65535(param)) {
841 if ((value < 0) || (value > 65535)) {
842 pr_err("Illegal value for \"%s\", must be"
843 " between 0 and 65535.\n", param->name);
844 return -1;
845 }
846 return 0;
847 }
848 if (IS_TYPERANGE_1_TO_65535(param)) {
849 if ((value < 1) || (value > 65535)) {
850 pr_err("Illegal value for \"%s\", must be"
851 " between 1 and 65535.\n", param->name);
852 return -1;
853 }
854 return 0;
855 }
856 if (IS_TYPERANGE_2_TO_3600(param)) {
857 if ((value < 2) || (value > 3600)) {
858 pr_err("Illegal value for \"%s\", must be"
859 " between 2 and 3600.\n", param->name);
860 return -1;
861 }
862 return 0;
863 }
864 if (IS_TYPERANGE_512_TO_16777215(param)) {
865 if ((value < 512) || (value > 16777215)) {
866 pr_err("Illegal value for \"%s\", must be"
867 " between 512 and 16777215.\n", param->name);
868 return -1;
869 }
870 return 0;
871 }
872
873 return 0;
874 }
875
iscsi_check_string_or_list_value(struct iscsi_param * param,char * value)876 static int iscsi_check_string_or_list_value(struct iscsi_param *param, char *value)
877 {
878 if (IS_PSTATE_PROPOSER(param))
879 return 0;
880
881 if (IS_TYPERANGE_AUTH_PARAM(param)) {
882 if (strcmp(value, KRB5) && strcmp(value, SPKM1) &&
883 strcmp(value, SPKM2) && strcmp(value, SRP) &&
884 strcmp(value, CHAP) && strcmp(value, NONE)) {
885 pr_err("Illegal value for \"%s\", must be"
886 " \"%s\", \"%s\", \"%s\", \"%s\", \"%s\""
887 " or \"%s\".\n", param->name, KRB5,
888 SPKM1, SPKM2, SRP, CHAP, NONE);
889 return -1;
890 }
891 }
892 if (IS_TYPERANGE_DIGEST_PARAM(param)) {
893 if (strcmp(value, CRC32C) && strcmp(value, NONE)) {
894 pr_err("Illegal value for \"%s\", must be"
895 " \"%s\" or \"%s\".\n", param->name,
896 CRC32C, NONE);
897 return -1;
898 }
899 }
900 if (IS_TYPERANGE_SESSIONTYPE(param)) {
901 if (strcmp(value, DISCOVERY) && strcmp(value, NORMAL)) {
902 pr_err("Illegal value for \"%s\", must be"
903 " \"%s\" or \"%s\".\n", param->name,
904 DISCOVERY, NORMAL);
905 return -1;
906 }
907 }
908
909 return 0;
910 }
911
iscsi_check_valuelist_for_support(struct iscsi_param * param,char * value)912 static char *iscsi_check_valuelist_for_support(
913 struct iscsi_param *param,
914 char *value)
915 {
916 char *tmp1 = NULL, *tmp2 = NULL;
917 char *acceptor_values = NULL, *proposer_values = NULL;
918
919 acceptor_values = param->value;
920 proposer_values = value;
921
922 do {
923 if (!proposer_values)
924 return NULL;
925 tmp1 = strchr(proposer_values, ',');
926 if (tmp1)
927 *tmp1 = '\0';
928 acceptor_values = param->value;
929 do {
930 if (!acceptor_values) {
931 if (tmp1)
932 *tmp1 = ',';
933 return NULL;
934 }
935 tmp2 = strchr(acceptor_values, ',');
936 if (tmp2)
937 *tmp2 = '\0';
938 if (!strcmp(acceptor_values, proposer_values)) {
939 if (tmp2)
940 *tmp2 = ',';
941 goto out;
942 }
943 if (tmp2)
944 *tmp2++ = ',';
945
946 acceptor_values = tmp2;
947 } while (acceptor_values);
948 if (tmp1)
949 *tmp1++ = ',';
950 proposer_values = tmp1;
951 } while (proposer_values);
952
953 out:
954 return proposer_values;
955 }
956
iscsi_check_acceptor_state(struct iscsi_param * param,char * value,struct iscsi_conn * conn)957 static int iscsi_check_acceptor_state(struct iscsi_param *param, char *value,
958 struct iscsi_conn *conn)
959 {
960 u8 acceptor_boolean_value = 0, proposer_boolean_value = 0;
961 char *negotiated_value = NULL;
962
963 if (IS_PSTATE_ACCEPTOR(param)) {
964 pr_err("Received key \"%s\" twice, protocol error.\n",
965 param->name);
966 return -1;
967 }
968
969 if (IS_PSTATE_REJECT(param))
970 return 0;
971
972 if (IS_TYPE_BOOL_AND(param)) {
973 if (!strcmp(value, YES))
974 proposer_boolean_value = 1;
975 if (!strcmp(param->value, YES))
976 acceptor_boolean_value = 1;
977 if (acceptor_boolean_value && proposer_boolean_value)
978 do {} while (0);
979 else {
980 if (iscsi_update_param_value(param, NO) < 0)
981 return -1;
982 if (!proposer_boolean_value)
983 SET_PSTATE_REPLY_OPTIONAL(param);
984 }
985 } else if (IS_TYPE_BOOL_OR(param)) {
986 if (!strcmp(value, YES))
987 proposer_boolean_value = 1;
988 if (!strcmp(param->value, YES))
989 acceptor_boolean_value = 1;
990 if (acceptor_boolean_value || proposer_boolean_value) {
991 if (iscsi_update_param_value(param, YES) < 0)
992 return -1;
993 if (proposer_boolean_value)
994 SET_PSTATE_REPLY_OPTIONAL(param);
995 }
996 } else if (IS_TYPE_NUMBER(param)) {
997 char *tmpptr, buf[11];
998 u32 acceptor_value = simple_strtoul(param->value, &tmpptr, 0);
999 u32 proposer_value = simple_strtoul(value, &tmpptr, 0);
1000
1001 memset(buf, 0, sizeof(buf));
1002
1003 if (!strcmp(param->name, MAXCONNECTIONS) ||
1004 !strcmp(param->name, MAXBURSTLENGTH) ||
1005 !strcmp(param->name, FIRSTBURSTLENGTH) ||
1006 !strcmp(param->name, MAXOUTSTANDINGR2T) ||
1007 !strcmp(param->name, DEFAULTTIME2RETAIN) ||
1008 !strcmp(param->name, ERRORRECOVERYLEVEL)) {
1009 if (proposer_value > acceptor_value) {
1010 sprintf(buf, "%u", acceptor_value);
1011 if (iscsi_update_param_value(param,
1012 &buf[0]) < 0)
1013 return -1;
1014 } else {
1015 if (iscsi_update_param_value(param, value) < 0)
1016 return -1;
1017 }
1018 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1019 if (acceptor_value > proposer_value) {
1020 sprintf(buf, "%u", acceptor_value);
1021 if (iscsi_update_param_value(param,
1022 &buf[0]) < 0)
1023 return -1;
1024 } else {
1025 if (iscsi_update_param_value(param, value) < 0)
1026 return -1;
1027 }
1028 } else {
1029 if (iscsi_update_param_value(param, value) < 0)
1030 return -1;
1031 }
1032
1033 if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1034 struct iscsi_param *param_mxdsl;
1035 unsigned long long tmp;
1036 int rc;
1037
1038 rc = kstrtoull(param->value, 0, &tmp);
1039 if (rc < 0)
1040 return -1;
1041
1042 conn->conn_ops->MaxRecvDataSegmentLength = tmp;
1043 pr_debug("Saving op->MaxRecvDataSegmentLength from"
1044 " original initiator received value: %u\n",
1045 conn->conn_ops->MaxRecvDataSegmentLength);
1046
1047 param_mxdsl = iscsi_find_param_from_key(
1048 MAXXMITDATASEGMENTLENGTH,
1049 conn->param_list);
1050 if (!param_mxdsl)
1051 return -1;
1052
1053 rc = iscsi_update_param_value(param,
1054 param_mxdsl->value);
1055 if (rc < 0)
1056 return -1;
1057
1058 pr_debug("Updated %s to target MXDSL value: %s\n",
1059 param->name, param->value);
1060 }
1061 } else if (IS_TYPE_VALUE_LIST(param)) {
1062 negotiated_value = iscsi_check_valuelist_for_support(
1063 param, value);
1064 if (!negotiated_value) {
1065 pr_err("Proposer's value list \"%s\" contains"
1066 " no valid values from Acceptor's value list"
1067 " \"%s\".\n", value, param->value);
1068 return -1;
1069 }
1070 if (iscsi_update_param_value(param, negotiated_value) < 0)
1071 return -1;
1072 } else if (IS_PHASE_DECLARATIVE(param)) {
1073 if (iscsi_update_param_value(param, value) < 0)
1074 return -1;
1075 SET_PSTATE_REPLY_OPTIONAL(param);
1076 }
1077
1078 return 0;
1079 }
1080
iscsi_check_proposer_state(struct iscsi_param * param,char * value)1081 static int iscsi_check_proposer_state(struct iscsi_param *param, char *value)
1082 {
1083 if (IS_PSTATE_RESPONSE_GOT(param)) {
1084 pr_err("Received key \"%s\" twice, protocol error.\n",
1085 param->name);
1086 return -1;
1087 }
1088
1089 if (IS_TYPE_VALUE_LIST(param)) {
1090 char *comma_ptr = NULL, *tmp_ptr = NULL;
1091
1092 comma_ptr = strchr(value, ',');
1093 if (comma_ptr) {
1094 pr_err("Illegal \",\" in response for \"%s\".\n",
1095 param->name);
1096 return -1;
1097 }
1098
1099 tmp_ptr = iscsi_check_valuelist_for_support(param, value);
1100 if (!tmp_ptr)
1101 return -1;
1102 }
1103
1104 if (iscsi_update_param_value(param, value) < 0)
1105 return -1;
1106
1107 return 0;
1108 }
1109
iscsi_check_value(struct iscsi_param * param,char * value)1110 static int iscsi_check_value(struct iscsi_param *param, char *value)
1111 {
1112 char *comma_ptr = NULL;
1113
1114 if (!strcmp(value, REJECT)) {
1115 if (!strcmp(param->name, IFMARKINT) ||
1116 !strcmp(param->name, OFMARKINT)) {
1117 /*
1118 * Reject is not fatal for [I,O]FMarkInt, and causes
1119 * [I,O]FMarker to be reset to No. (See iSCSI v20 A.3.2)
1120 */
1121 SET_PSTATE_REJECT(param);
1122 return 0;
1123 }
1124 pr_err("Received %s=%s\n", param->name, value);
1125 return -1;
1126 }
1127 if (!strcmp(value, IRRELEVANT)) {
1128 pr_debug("Received %s=%s\n", param->name, value);
1129 SET_PSTATE_IRRELEVANT(param);
1130 return 0;
1131 }
1132 if (!strcmp(value, NOTUNDERSTOOD)) {
1133 if (!IS_PSTATE_PROPOSER(param)) {
1134 pr_err("Received illegal offer %s=%s\n",
1135 param->name, value);
1136 return -1;
1137 }
1138
1139 /* #warning FIXME: Add check for X-ExtensionKey here */
1140 pr_err("Standard iSCSI key \"%s\" cannot be answered"
1141 " with \"%s\", protocol error.\n", param->name, value);
1142 return -1;
1143 }
1144
1145 do {
1146 comma_ptr = NULL;
1147 comma_ptr = strchr(value, ',');
1148
1149 if (comma_ptr && !IS_TYPE_VALUE_LIST(param)) {
1150 pr_err("Detected value separator \",\", but"
1151 " key \"%s\" does not allow a value list,"
1152 " protocol error.\n", param->name);
1153 return -1;
1154 }
1155 if (comma_ptr)
1156 *comma_ptr = '\0';
1157
1158 if (strlen(value) > VALUE_MAXLEN) {
1159 pr_err("Value for key \"%s\" exceeds %d,"
1160 " protocol error.\n", param->name,
1161 VALUE_MAXLEN);
1162 return -1;
1163 }
1164
1165 if (IS_TYPE_BOOL_AND(param) || IS_TYPE_BOOL_OR(param)) {
1166 if (iscsi_check_boolean_value(param, value) < 0)
1167 return -1;
1168 } else if (IS_TYPE_NUMBER(param)) {
1169 if (iscsi_check_numerical_value(param, value) < 0)
1170 return -1;
1171 } else if (IS_TYPE_STRING(param) || IS_TYPE_VALUE_LIST(param)) {
1172 if (iscsi_check_string_or_list_value(param, value) < 0)
1173 return -1;
1174 } else {
1175 pr_err("Huh? 0x%02x\n", param->type);
1176 return -1;
1177 }
1178
1179 if (comma_ptr)
1180 *comma_ptr++ = ',';
1181
1182 value = comma_ptr;
1183 } while (value);
1184
1185 return 0;
1186 }
1187
__iscsi_check_key(char * key,int sender,struct iscsi_param_list * param_list)1188 static struct iscsi_param *__iscsi_check_key(
1189 char *key,
1190 int sender,
1191 struct iscsi_param_list *param_list)
1192 {
1193 struct iscsi_param *param;
1194
1195 if (strlen(key) > KEY_MAXLEN) {
1196 pr_err("Length of key name \"%s\" exceeds %d.\n",
1197 key, KEY_MAXLEN);
1198 return NULL;
1199 }
1200
1201 param = iscsi_find_param_from_key(key, param_list);
1202 if (!param)
1203 return NULL;
1204
1205 if ((sender & SENDER_INITIATOR) && !IS_SENDER_INITIATOR(param)) {
1206 pr_err("Key \"%s\" may not be sent to %s,"
1207 " protocol error.\n", param->name,
1208 (sender & SENDER_RECEIVER) ? "target" : "initiator");
1209 return NULL;
1210 }
1211
1212 if ((sender & SENDER_TARGET) && !IS_SENDER_TARGET(param)) {
1213 pr_err("Key \"%s\" may not be sent to %s,"
1214 " protocol error.\n", param->name,
1215 (sender & SENDER_RECEIVER) ? "initiator" : "target");
1216 return NULL;
1217 }
1218
1219 return param;
1220 }
1221
iscsi_check_key(char * key,int phase,int sender,struct iscsi_param_list * param_list)1222 static struct iscsi_param *iscsi_check_key(
1223 char *key,
1224 int phase,
1225 int sender,
1226 struct iscsi_param_list *param_list)
1227 {
1228 struct iscsi_param *param;
1229 /*
1230 * Key name length must not exceed 63 bytes. (See iSCSI v20 5.1)
1231 */
1232 if (strlen(key) > KEY_MAXLEN) {
1233 pr_err("Length of key name \"%s\" exceeds %d.\n",
1234 key, KEY_MAXLEN);
1235 return NULL;
1236 }
1237
1238 param = iscsi_find_param_from_key(key, param_list);
1239 if (!param)
1240 return NULL;
1241
1242 if ((sender & SENDER_INITIATOR) && !IS_SENDER_INITIATOR(param)) {
1243 pr_err("Key \"%s\" may not be sent to %s,"
1244 " protocol error.\n", param->name,
1245 (sender & SENDER_RECEIVER) ? "target" : "initiator");
1246 return NULL;
1247 }
1248 if ((sender & SENDER_TARGET) && !IS_SENDER_TARGET(param)) {
1249 pr_err("Key \"%s\" may not be sent to %s,"
1250 " protocol error.\n", param->name,
1251 (sender & SENDER_RECEIVER) ? "initiator" : "target");
1252 return NULL;
1253 }
1254
1255 if (IS_PSTATE_ACCEPTOR(param)) {
1256 pr_err("Key \"%s\" received twice, protocol error.\n",
1257 key);
1258 return NULL;
1259 }
1260
1261 if (!phase)
1262 return param;
1263
1264 if (!(param->phase & phase)) {
1265 pr_err("Key \"%s\" may not be negotiated during ",
1266 param->name);
1267 switch (phase) {
1268 case PHASE_SECURITY:
1269 pr_debug("Security phase.\n");
1270 break;
1271 case PHASE_OPERATIONAL:
1272 pr_debug("Operational phase.\n");
1273 break;
1274 default:
1275 pr_debug("Unknown phase.\n");
1276 }
1277 return NULL;
1278 }
1279
1280 return param;
1281 }
1282
iscsi_enforce_integrity_rules(u8 phase,struct iscsi_param_list * param_list)1283 static int iscsi_enforce_integrity_rules(
1284 u8 phase,
1285 struct iscsi_param_list *param_list)
1286 {
1287 char *tmpptr;
1288 u8 DataSequenceInOrder = 0;
1289 u8 ErrorRecoveryLevel = 0, SessionType = 0;
1290 u32 FirstBurstLength = 0, MaxBurstLength = 0;
1291 struct iscsi_param *param = NULL;
1292
1293 list_for_each_entry(param, ¶m_list->param_list, p_list) {
1294 if (!(param->phase & phase))
1295 continue;
1296 if (!strcmp(param->name, SESSIONTYPE))
1297 if (!strcmp(param->value, NORMAL))
1298 SessionType = 1;
1299 if (!strcmp(param->name, ERRORRECOVERYLEVEL))
1300 ErrorRecoveryLevel = simple_strtoul(param->value,
1301 &tmpptr, 0);
1302 if (!strcmp(param->name, DATASEQUENCEINORDER))
1303 if (!strcmp(param->value, YES))
1304 DataSequenceInOrder = 1;
1305 if (!strcmp(param->name, MAXBURSTLENGTH))
1306 MaxBurstLength = simple_strtoul(param->value,
1307 &tmpptr, 0);
1308 }
1309
1310 list_for_each_entry(param, ¶m_list->param_list, p_list) {
1311 if (!(param->phase & phase))
1312 continue;
1313 if (!SessionType && !IS_PSTATE_ACCEPTOR(param))
1314 continue;
1315 if (!strcmp(param->name, MAXOUTSTANDINGR2T) &&
1316 DataSequenceInOrder && (ErrorRecoveryLevel > 0)) {
1317 if (strcmp(param->value, "1")) {
1318 if (iscsi_update_param_value(param, "1") < 0)
1319 return -1;
1320 pr_debug("Reset \"%s\" to \"%s\".\n",
1321 param->name, param->value);
1322 }
1323 }
1324 if (!strcmp(param->name, MAXCONNECTIONS) && !SessionType) {
1325 if (strcmp(param->value, "1")) {
1326 if (iscsi_update_param_value(param, "1") < 0)
1327 return -1;
1328 pr_debug("Reset \"%s\" to \"%s\".\n",
1329 param->name, param->value);
1330 }
1331 }
1332 if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1333 FirstBurstLength = simple_strtoul(param->value,
1334 &tmpptr, 0);
1335 if (FirstBurstLength > MaxBurstLength) {
1336 char tmpbuf[11];
1337 memset(tmpbuf, 0, sizeof(tmpbuf));
1338 sprintf(tmpbuf, "%u", MaxBurstLength);
1339 if (iscsi_update_param_value(param, tmpbuf))
1340 return -1;
1341 pr_debug("Reset \"%s\" to \"%s\".\n",
1342 param->name, param->value);
1343 }
1344 }
1345 }
1346
1347 return 0;
1348 }
1349
iscsi_decode_text_input(u8 phase,u8 sender,char * textbuf,u32 length,struct iscsi_conn * conn)1350 int iscsi_decode_text_input(
1351 u8 phase,
1352 u8 sender,
1353 char *textbuf,
1354 u32 length,
1355 struct iscsi_conn *conn)
1356 {
1357 struct iscsi_param_list *param_list = conn->param_list;
1358 char *tmpbuf, *start = NULL, *end = NULL;
1359
1360 tmpbuf = kzalloc(length + 1, GFP_KERNEL);
1361 if (!tmpbuf) {
1362 pr_err("Unable to allocate %u + 1 bytes for tmpbuf.\n", length);
1363 return -ENOMEM;
1364 }
1365
1366 memcpy(tmpbuf, textbuf, length);
1367 tmpbuf[length] = '\0';
1368 start = tmpbuf;
1369 end = (start + length);
1370
1371 while (start < end) {
1372 char *key, *value;
1373 struct iscsi_param *param;
1374
1375 if (iscsi_extract_key_value(start, &key, &value) < 0)
1376 goto free_buffer;
1377
1378 pr_debug("Got key: %s=%s\n", key, value);
1379
1380 if (phase & PHASE_SECURITY) {
1381 if (iscsi_check_for_auth_key(key) > 0) {
1382 kfree(tmpbuf);
1383 return 1;
1384 }
1385 }
1386
1387 param = iscsi_check_key(key, phase, sender, param_list);
1388 if (!param) {
1389 if (iscsi_add_notunderstood_response(key, value,
1390 param_list) < 0)
1391 goto free_buffer;
1392
1393 start += strlen(key) + strlen(value) + 2;
1394 continue;
1395 }
1396 if (iscsi_check_value(param, value) < 0)
1397 goto free_buffer;
1398
1399 start += strlen(key) + strlen(value) + 2;
1400
1401 if (IS_PSTATE_PROPOSER(param)) {
1402 if (iscsi_check_proposer_state(param, value) < 0)
1403 goto free_buffer;
1404
1405 SET_PSTATE_RESPONSE_GOT(param);
1406 } else {
1407 if (iscsi_check_acceptor_state(param, value, conn) < 0)
1408 goto free_buffer;
1409
1410 SET_PSTATE_ACCEPTOR(param);
1411 }
1412 }
1413
1414 kfree(tmpbuf);
1415 return 0;
1416
1417 free_buffer:
1418 kfree(tmpbuf);
1419 return -1;
1420 }
1421
iscsi_encode_text_output(u8 phase,u8 sender,char * textbuf,u32 * length,struct iscsi_param_list * param_list,bool keys_workaround)1422 int iscsi_encode_text_output(
1423 u8 phase,
1424 u8 sender,
1425 char *textbuf,
1426 u32 *length,
1427 struct iscsi_param_list *param_list,
1428 bool keys_workaround)
1429 {
1430 char *output_buf = NULL;
1431 struct iscsi_extra_response *er;
1432 struct iscsi_param *param;
1433
1434 output_buf = textbuf + *length;
1435
1436 if (iscsi_enforce_integrity_rules(phase, param_list) < 0)
1437 return -1;
1438
1439 list_for_each_entry(param, ¶m_list->param_list, p_list) {
1440 if (!(param->sender & sender))
1441 continue;
1442 if (IS_PSTATE_ACCEPTOR(param) &&
1443 !IS_PSTATE_RESPONSE_SENT(param) &&
1444 !IS_PSTATE_REPLY_OPTIONAL(param) &&
1445 (param->phase & phase)) {
1446 *length += sprintf(output_buf, "%s=%s",
1447 param->name, param->value);
1448 *length += 1;
1449 output_buf = textbuf + *length;
1450 SET_PSTATE_RESPONSE_SENT(param);
1451 pr_debug("Sending key: %s=%s\n",
1452 param->name, param->value);
1453 continue;
1454 }
1455 if (IS_PSTATE_NEGOTIATE(param) &&
1456 !IS_PSTATE_ACCEPTOR(param) &&
1457 !IS_PSTATE_PROPOSER(param) &&
1458 (param->phase & phase)) {
1459 *length += sprintf(output_buf, "%s=%s",
1460 param->name, param->value);
1461 *length += 1;
1462 output_buf = textbuf + *length;
1463 SET_PSTATE_PROPOSER(param);
1464 iscsi_check_proposer_for_optional_reply(param,
1465 keys_workaround);
1466 pr_debug("Sending key: %s=%s\n",
1467 param->name, param->value);
1468 }
1469 }
1470
1471 list_for_each_entry(er, ¶m_list->extra_response_list, er_list) {
1472 *length += sprintf(output_buf, "%s=%s", er->key, er->value);
1473 *length += 1;
1474 output_buf = textbuf + *length;
1475 pr_debug("Sending key: %s=%s\n", er->key, er->value);
1476 }
1477 iscsi_release_extra_responses(param_list);
1478
1479 return 0;
1480 }
1481
iscsi_check_negotiated_keys(struct iscsi_param_list * param_list)1482 int iscsi_check_negotiated_keys(struct iscsi_param_list *param_list)
1483 {
1484 int ret = 0;
1485 struct iscsi_param *param;
1486
1487 list_for_each_entry(param, ¶m_list->param_list, p_list) {
1488 if (IS_PSTATE_NEGOTIATE(param) &&
1489 IS_PSTATE_PROPOSER(param) &&
1490 !IS_PSTATE_RESPONSE_GOT(param) &&
1491 !IS_PSTATE_REPLY_OPTIONAL(param) &&
1492 !IS_PHASE_DECLARATIVE(param)) {
1493 pr_err("No response for proposed key \"%s\".\n",
1494 param->name);
1495 ret = -1;
1496 }
1497 }
1498
1499 return ret;
1500 }
1501
iscsi_change_param_value(char * keyvalue,struct iscsi_param_list * param_list,int check_key)1502 int iscsi_change_param_value(
1503 char *keyvalue,
1504 struct iscsi_param_list *param_list,
1505 int check_key)
1506 {
1507 char *key = NULL, *value = NULL;
1508 struct iscsi_param *param;
1509 int sender = 0;
1510
1511 if (iscsi_extract_key_value(keyvalue, &key, &value) < 0)
1512 return -1;
1513
1514 if (!check_key) {
1515 param = __iscsi_check_key(keyvalue, sender, param_list);
1516 if (!param)
1517 return -1;
1518 } else {
1519 param = iscsi_check_key(keyvalue, 0, sender, param_list);
1520 if (!param)
1521 return -1;
1522
1523 param->set_param = 1;
1524 if (iscsi_check_value(param, value) < 0) {
1525 param->set_param = 0;
1526 return -1;
1527 }
1528 param->set_param = 0;
1529 }
1530
1531 if (iscsi_update_param_value(param, value) < 0)
1532 return -1;
1533
1534 return 0;
1535 }
1536
iscsi_set_connection_parameters(struct iscsi_conn_ops * ops,struct iscsi_param_list * param_list)1537 void iscsi_set_connection_parameters(
1538 struct iscsi_conn_ops *ops,
1539 struct iscsi_param_list *param_list)
1540 {
1541 char *tmpptr;
1542 struct iscsi_param *param;
1543
1544 pr_debug("---------------------------------------------------"
1545 "---------------\n");
1546 list_for_each_entry(param, ¶m_list->param_list, p_list) {
1547 /*
1548 * Special case to set MAXXMITDATASEGMENTLENGTH from the
1549 * target requested MaxRecvDataSegmentLength, even though
1550 * this key is not sent over the wire.
1551 */
1552 if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
1553 ops->MaxXmitDataSegmentLength =
1554 simple_strtoul(param->value, &tmpptr, 0);
1555 pr_debug("MaxXmitDataSegmentLength: %s\n",
1556 param->value);
1557 }
1558
1559 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1560 continue;
1561 if (!strcmp(param->name, AUTHMETHOD)) {
1562 pr_debug("AuthMethod: %s\n",
1563 param->value);
1564 } else if (!strcmp(param->name, HEADERDIGEST)) {
1565 ops->HeaderDigest = !strcmp(param->value, CRC32C);
1566 pr_debug("HeaderDigest: %s\n",
1567 param->value);
1568 } else if (!strcmp(param->name, DATADIGEST)) {
1569 ops->DataDigest = !strcmp(param->value, CRC32C);
1570 pr_debug("DataDigest: %s\n",
1571 param->value);
1572 } else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1573 /*
1574 * At this point iscsi_check_acceptor_state() will have
1575 * set ops->MaxRecvDataSegmentLength from the original
1576 * initiator provided value.
1577 */
1578 pr_debug("MaxRecvDataSegmentLength: %u\n",
1579 ops->MaxRecvDataSegmentLength);
1580 } else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
1581 ops->InitiatorRecvDataSegmentLength =
1582 simple_strtoul(param->value, &tmpptr, 0);
1583 pr_debug("InitiatorRecvDataSegmentLength: %s\n",
1584 param->value);
1585 ops->MaxRecvDataSegmentLength =
1586 ops->InitiatorRecvDataSegmentLength;
1587 pr_debug("Set MRDSL from InitiatorRecvDataSegmentLength\n");
1588 } else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
1589 ops->TargetRecvDataSegmentLength =
1590 simple_strtoul(param->value, &tmpptr, 0);
1591 pr_debug("TargetRecvDataSegmentLength: %s\n",
1592 param->value);
1593 ops->MaxXmitDataSegmentLength =
1594 ops->TargetRecvDataSegmentLength;
1595 pr_debug("Set MXDSL from TargetRecvDataSegmentLength\n");
1596 }
1597 }
1598 pr_debug("----------------------------------------------------"
1599 "--------------\n");
1600 }
1601
iscsi_set_session_parameters(struct iscsi_sess_ops * ops,struct iscsi_param_list * param_list,int leading)1602 void iscsi_set_session_parameters(
1603 struct iscsi_sess_ops *ops,
1604 struct iscsi_param_list *param_list,
1605 int leading)
1606 {
1607 char *tmpptr;
1608 struct iscsi_param *param;
1609
1610 pr_debug("----------------------------------------------------"
1611 "--------------\n");
1612 list_for_each_entry(param, ¶m_list->param_list, p_list) {
1613 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1614 continue;
1615 if (!strcmp(param->name, INITIATORNAME)) {
1616 if (!param->value)
1617 continue;
1618 if (leading)
1619 snprintf(ops->InitiatorName,
1620 sizeof(ops->InitiatorName),
1621 "%s", param->value);
1622 pr_debug("InitiatorName: %s\n",
1623 param->value);
1624 } else if (!strcmp(param->name, INITIATORALIAS)) {
1625 if (!param->value)
1626 continue;
1627 snprintf(ops->InitiatorAlias,
1628 sizeof(ops->InitiatorAlias),
1629 "%s", param->value);
1630 pr_debug("InitiatorAlias: %s\n",
1631 param->value);
1632 } else if (!strcmp(param->name, TARGETNAME)) {
1633 if (!param->value)
1634 continue;
1635 if (leading)
1636 snprintf(ops->TargetName,
1637 sizeof(ops->TargetName),
1638 "%s", param->value);
1639 pr_debug("TargetName: %s\n",
1640 param->value);
1641 } else if (!strcmp(param->name, TARGETALIAS)) {
1642 if (!param->value)
1643 continue;
1644 snprintf(ops->TargetAlias, sizeof(ops->TargetAlias),
1645 "%s", param->value);
1646 pr_debug("TargetAlias: %s\n",
1647 param->value);
1648 } else if (!strcmp(param->name, TARGETPORTALGROUPTAG)) {
1649 ops->TargetPortalGroupTag =
1650 simple_strtoul(param->value, &tmpptr, 0);
1651 pr_debug("TargetPortalGroupTag: %s\n",
1652 param->value);
1653 } else if (!strcmp(param->name, MAXCONNECTIONS)) {
1654 ops->MaxConnections =
1655 simple_strtoul(param->value, &tmpptr, 0);
1656 pr_debug("MaxConnections: %s\n",
1657 param->value);
1658 } else if (!strcmp(param->name, INITIALR2T)) {
1659 ops->InitialR2T = !strcmp(param->value, YES);
1660 pr_debug("InitialR2T: %s\n",
1661 param->value);
1662 } else if (!strcmp(param->name, IMMEDIATEDATA)) {
1663 ops->ImmediateData = !strcmp(param->value, YES);
1664 pr_debug("ImmediateData: %s\n",
1665 param->value);
1666 } else if (!strcmp(param->name, MAXBURSTLENGTH)) {
1667 ops->MaxBurstLength =
1668 simple_strtoul(param->value, &tmpptr, 0);
1669 pr_debug("MaxBurstLength: %s\n",
1670 param->value);
1671 } else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1672 ops->FirstBurstLength =
1673 simple_strtoul(param->value, &tmpptr, 0);
1674 pr_debug("FirstBurstLength: %s\n",
1675 param->value);
1676 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1677 ops->DefaultTime2Wait =
1678 simple_strtoul(param->value, &tmpptr, 0);
1679 pr_debug("DefaultTime2Wait: %s\n",
1680 param->value);
1681 } else if (!strcmp(param->name, DEFAULTTIME2RETAIN)) {
1682 ops->DefaultTime2Retain =
1683 simple_strtoul(param->value, &tmpptr, 0);
1684 pr_debug("DefaultTime2Retain: %s\n",
1685 param->value);
1686 } else if (!strcmp(param->name, MAXOUTSTANDINGR2T)) {
1687 ops->MaxOutstandingR2T =
1688 simple_strtoul(param->value, &tmpptr, 0);
1689 pr_debug("MaxOutstandingR2T: %s\n",
1690 param->value);
1691 } else if (!strcmp(param->name, DATAPDUINORDER)) {
1692 ops->DataPDUInOrder = !strcmp(param->value, YES);
1693 pr_debug("DataPDUInOrder: %s\n",
1694 param->value);
1695 } else if (!strcmp(param->name, DATASEQUENCEINORDER)) {
1696 ops->DataSequenceInOrder = !strcmp(param->value, YES);
1697 pr_debug("DataSequenceInOrder: %s\n",
1698 param->value);
1699 } else if (!strcmp(param->name, ERRORRECOVERYLEVEL)) {
1700 ops->ErrorRecoveryLevel =
1701 simple_strtoul(param->value, &tmpptr, 0);
1702 pr_debug("ErrorRecoveryLevel: %s\n",
1703 param->value);
1704 } else if (!strcmp(param->name, SESSIONTYPE)) {
1705 ops->SessionType = !strcmp(param->value, DISCOVERY);
1706 pr_debug("SessionType: %s\n",
1707 param->value);
1708 } else if (!strcmp(param->name, RDMAEXTENSIONS)) {
1709 ops->RDMAExtensions = !strcmp(param->value, YES);
1710 pr_debug("RDMAExtensions: %s\n",
1711 param->value);
1712 }
1713 }
1714 pr_debug("----------------------------------------------------"
1715 "--------------\n");
1716
1717 }
1718