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 
17 int iscsi_login_rx_data(
18 	struct iscsit_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 
39 int iscsi_login_tx_data(
40 	struct iscsit_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 
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 
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 
110 void iscsi_print_params(struct iscsi_param_list *param_list)
111 {
112 	struct iscsi_param *param;
113 
114 	list_for_each_entry(param, &param_list->param_list, p_list)
115 		pr_debug("%s: %s\n", param->name, param->value);
116 }
117 
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(&param->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(&param->p_list, &param_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 */
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 
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, &param_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 
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, &param_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 
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(&param_list->param_list);
576 	INIT_LIST_HEAD(&param_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, &param_list->param_list);
611 	}
612 
613 	if (!list_empty(&param_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 
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, &param_list->extra_response_list,
632 			er_list) {
633 		list_del(&er->er_list);
634 		kfree(er);
635 	}
636 }
637 
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, &param_list->param_list,
643 			p_list) {
644 		list_del(&param->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 
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, &param_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 
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 
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 
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 			&param_list->extra_response_list);
735 	return 0;
736 }
737 
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 
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 
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 
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 
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 
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 
957 static int iscsi_check_acceptor_state(struct iscsi_param *param, char *value,
958 				struct iscsit_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 
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 
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 
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 
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 
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, &param_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, &param_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 
1350 int iscsi_decode_text_input(
1351 	u8 phase,
1352 	u8 sender,
1353 	char *textbuf,
1354 	u32 length,
1355 	struct iscsit_conn *conn)
1356 {
1357 	struct iscsi_param_list *param_list = conn->param_list;
1358 	char *tmpbuf, *start = NULL, *end = NULL;
1359 
1360 	tmpbuf = kmemdup_nul(textbuf, length, GFP_KERNEL);
1361 	if (!tmpbuf) {
1362 		pr_err("Unable to allocate %u + 1 bytes for tmpbuf.\n", length);
1363 		return -ENOMEM;
1364 	}
1365 
1366 	start = tmpbuf;
1367 	end = (start + length);
1368 
1369 	while (start < end) {
1370 		char *key, *value;
1371 		struct iscsi_param *param;
1372 
1373 		if (iscsi_extract_key_value(start, &key, &value) < 0)
1374 			goto free_buffer;
1375 
1376 		pr_debug("Got key: %s=%s\n", key, value);
1377 
1378 		if (phase & PHASE_SECURITY) {
1379 			if (iscsi_check_for_auth_key(key) > 0) {
1380 				kfree(tmpbuf);
1381 				return 1;
1382 			}
1383 		}
1384 
1385 		param = iscsi_check_key(key, phase, sender, param_list);
1386 		if (!param) {
1387 			if (iscsi_add_notunderstood_response(key, value,
1388 							     param_list) < 0)
1389 				goto free_buffer;
1390 
1391 			start += strlen(key) + strlen(value) + 2;
1392 			continue;
1393 		}
1394 		if (iscsi_check_value(param, value) < 0)
1395 			goto free_buffer;
1396 
1397 		start += strlen(key) + strlen(value) + 2;
1398 
1399 		if (IS_PSTATE_PROPOSER(param)) {
1400 			if (iscsi_check_proposer_state(param, value) < 0)
1401 				goto free_buffer;
1402 
1403 			SET_PSTATE_RESPONSE_GOT(param);
1404 		} else {
1405 			if (iscsi_check_acceptor_state(param, value, conn) < 0)
1406 				goto free_buffer;
1407 
1408 			SET_PSTATE_ACCEPTOR(param);
1409 		}
1410 	}
1411 
1412 	kfree(tmpbuf);
1413 	return 0;
1414 
1415 free_buffer:
1416 	kfree(tmpbuf);
1417 	return -1;
1418 }
1419 
1420 int iscsi_encode_text_output(
1421 	u8 phase,
1422 	u8 sender,
1423 	char *textbuf,
1424 	u32 *length,
1425 	struct iscsi_param_list *param_list,
1426 	bool keys_workaround)
1427 {
1428 	char *output_buf = NULL;
1429 	struct iscsi_extra_response *er;
1430 	struct iscsi_param *param;
1431 
1432 	output_buf = textbuf + *length;
1433 
1434 	if (iscsi_enforce_integrity_rules(phase, param_list) < 0)
1435 		return -1;
1436 
1437 	list_for_each_entry(param, &param_list->param_list, p_list) {
1438 		if (!(param->sender & sender))
1439 			continue;
1440 		if (IS_PSTATE_ACCEPTOR(param) &&
1441 		    !IS_PSTATE_RESPONSE_SENT(param) &&
1442 		    !IS_PSTATE_REPLY_OPTIONAL(param) &&
1443 		    (param->phase & phase)) {
1444 			*length += sprintf(output_buf, "%s=%s",
1445 				param->name, param->value);
1446 			*length += 1;
1447 			output_buf = textbuf + *length;
1448 			SET_PSTATE_RESPONSE_SENT(param);
1449 			pr_debug("Sending key: %s=%s\n",
1450 				param->name, param->value);
1451 			continue;
1452 		}
1453 		if (IS_PSTATE_NEGOTIATE(param) &&
1454 		    !IS_PSTATE_ACCEPTOR(param) &&
1455 		    !IS_PSTATE_PROPOSER(param) &&
1456 		    (param->phase & phase)) {
1457 			*length += sprintf(output_buf, "%s=%s",
1458 				param->name, param->value);
1459 			*length += 1;
1460 			output_buf = textbuf + *length;
1461 			SET_PSTATE_PROPOSER(param);
1462 			iscsi_check_proposer_for_optional_reply(param,
1463 							        keys_workaround);
1464 			pr_debug("Sending key: %s=%s\n",
1465 				param->name, param->value);
1466 		}
1467 	}
1468 
1469 	list_for_each_entry(er, &param_list->extra_response_list, er_list) {
1470 		*length += sprintf(output_buf, "%s=%s", er->key, er->value);
1471 		*length += 1;
1472 		output_buf = textbuf + *length;
1473 		pr_debug("Sending key: %s=%s\n", er->key, er->value);
1474 	}
1475 	iscsi_release_extra_responses(param_list);
1476 
1477 	return 0;
1478 }
1479 
1480 int iscsi_check_negotiated_keys(struct iscsi_param_list *param_list)
1481 {
1482 	int ret = 0;
1483 	struct iscsi_param *param;
1484 
1485 	list_for_each_entry(param, &param_list->param_list, p_list) {
1486 		if (IS_PSTATE_NEGOTIATE(param) &&
1487 		    IS_PSTATE_PROPOSER(param) &&
1488 		    !IS_PSTATE_RESPONSE_GOT(param) &&
1489 		    !IS_PSTATE_REPLY_OPTIONAL(param) &&
1490 		    !IS_PHASE_DECLARATIVE(param)) {
1491 			pr_err("No response for proposed key \"%s\".\n",
1492 					param->name);
1493 			ret = -1;
1494 		}
1495 	}
1496 
1497 	return ret;
1498 }
1499 
1500 int iscsi_change_param_value(
1501 	char *keyvalue,
1502 	struct iscsi_param_list *param_list,
1503 	int check_key)
1504 {
1505 	char *key = NULL, *value = NULL;
1506 	struct iscsi_param *param;
1507 	int sender = 0;
1508 
1509 	if (iscsi_extract_key_value(keyvalue, &key, &value) < 0)
1510 		return -1;
1511 
1512 	if (!check_key) {
1513 		param = __iscsi_check_key(keyvalue, sender, param_list);
1514 		if (!param)
1515 			return -1;
1516 	} else {
1517 		param = iscsi_check_key(keyvalue, 0, sender, param_list);
1518 		if (!param)
1519 			return -1;
1520 
1521 		param->set_param = 1;
1522 		if (iscsi_check_value(param, value) < 0) {
1523 			param->set_param = 0;
1524 			return -1;
1525 		}
1526 		param->set_param = 0;
1527 	}
1528 
1529 	if (iscsi_update_param_value(param, value) < 0)
1530 		return -1;
1531 
1532 	return 0;
1533 }
1534 
1535 void iscsi_set_connection_parameters(
1536 	struct iscsi_conn_ops *ops,
1537 	struct iscsi_param_list *param_list)
1538 {
1539 	char *tmpptr;
1540 	struct iscsi_param *param;
1541 
1542 	pr_debug("---------------------------------------------------"
1543 			"---------------\n");
1544 	list_for_each_entry(param, &param_list->param_list, p_list) {
1545 		/*
1546 		 * Special case to set MAXXMITDATASEGMENTLENGTH from the
1547 		 * target requested MaxRecvDataSegmentLength, even though
1548 		 * this key is not sent over the wire.
1549 		 */
1550 		if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
1551 			ops->MaxXmitDataSegmentLength =
1552 				simple_strtoul(param->value, &tmpptr, 0);
1553 			pr_debug("MaxXmitDataSegmentLength:     %s\n",
1554 				param->value);
1555 		}
1556 
1557 		if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1558 			continue;
1559 		if (!strcmp(param->name, AUTHMETHOD)) {
1560 			pr_debug("AuthMethod:                   %s\n",
1561 				param->value);
1562 		} else if (!strcmp(param->name, HEADERDIGEST)) {
1563 			ops->HeaderDigest = !strcmp(param->value, CRC32C);
1564 			pr_debug("HeaderDigest:                 %s\n",
1565 				param->value);
1566 		} else if (!strcmp(param->name, DATADIGEST)) {
1567 			ops->DataDigest = !strcmp(param->value, CRC32C);
1568 			pr_debug("DataDigest:                   %s\n",
1569 				param->value);
1570 		} else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1571 			/*
1572 			 * At this point iscsi_check_acceptor_state() will have
1573 			 * set ops->MaxRecvDataSegmentLength from the original
1574 			 * initiator provided value.
1575 			 */
1576 			pr_debug("MaxRecvDataSegmentLength:     %u\n",
1577 				ops->MaxRecvDataSegmentLength);
1578 		} else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
1579 			ops->InitiatorRecvDataSegmentLength =
1580 				simple_strtoul(param->value, &tmpptr, 0);
1581 			pr_debug("InitiatorRecvDataSegmentLength: %s\n",
1582 				param->value);
1583 			ops->MaxRecvDataSegmentLength =
1584 					ops->InitiatorRecvDataSegmentLength;
1585 			pr_debug("Set MRDSL from InitiatorRecvDataSegmentLength\n");
1586 		} else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
1587 			ops->TargetRecvDataSegmentLength =
1588 				simple_strtoul(param->value, &tmpptr, 0);
1589 			pr_debug("TargetRecvDataSegmentLength:  %s\n",
1590 				param->value);
1591 			ops->MaxXmitDataSegmentLength =
1592 					ops->TargetRecvDataSegmentLength;
1593 			pr_debug("Set MXDSL from TargetRecvDataSegmentLength\n");
1594 		}
1595 	}
1596 	pr_debug("----------------------------------------------------"
1597 			"--------------\n");
1598 }
1599 
1600 void iscsi_set_session_parameters(
1601 	struct iscsi_sess_ops *ops,
1602 	struct iscsi_param_list *param_list,
1603 	int leading)
1604 {
1605 	char *tmpptr;
1606 	struct iscsi_param *param;
1607 
1608 	pr_debug("----------------------------------------------------"
1609 			"--------------\n");
1610 	list_for_each_entry(param, &param_list->param_list, p_list) {
1611 		if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1612 			continue;
1613 		if (!strcmp(param->name, INITIATORNAME)) {
1614 			if (!param->value)
1615 				continue;
1616 			if (leading)
1617 				snprintf(ops->InitiatorName,
1618 						sizeof(ops->InitiatorName),
1619 						"%s", param->value);
1620 			pr_debug("InitiatorName:                %s\n",
1621 				param->value);
1622 		} else if (!strcmp(param->name, INITIATORALIAS)) {
1623 			if (!param->value)
1624 				continue;
1625 			snprintf(ops->InitiatorAlias,
1626 						sizeof(ops->InitiatorAlias),
1627 						"%s", param->value);
1628 			pr_debug("InitiatorAlias:               %s\n",
1629 				param->value);
1630 		} else if (!strcmp(param->name, TARGETNAME)) {
1631 			if (!param->value)
1632 				continue;
1633 			if (leading)
1634 				snprintf(ops->TargetName,
1635 						sizeof(ops->TargetName),
1636 						"%s", param->value);
1637 			pr_debug("TargetName:                   %s\n",
1638 				param->value);
1639 		} else if (!strcmp(param->name, TARGETALIAS)) {
1640 			if (!param->value)
1641 				continue;
1642 			snprintf(ops->TargetAlias, sizeof(ops->TargetAlias),
1643 					"%s", param->value);
1644 			pr_debug("TargetAlias:                  %s\n",
1645 				param->value);
1646 		} else if (!strcmp(param->name, TARGETPORTALGROUPTAG)) {
1647 			ops->TargetPortalGroupTag =
1648 				simple_strtoul(param->value, &tmpptr, 0);
1649 			pr_debug("TargetPortalGroupTag:         %s\n",
1650 				param->value);
1651 		} else if (!strcmp(param->name, MAXCONNECTIONS)) {
1652 			ops->MaxConnections =
1653 				simple_strtoul(param->value, &tmpptr, 0);
1654 			pr_debug("MaxConnections:               %s\n",
1655 				param->value);
1656 		} else if (!strcmp(param->name, INITIALR2T)) {
1657 			ops->InitialR2T = !strcmp(param->value, YES);
1658 			pr_debug("InitialR2T:                   %s\n",
1659 				param->value);
1660 		} else if (!strcmp(param->name, IMMEDIATEDATA)) {
1661 			ops->ImmediateData = !strcmp(param->value, YES);
1662 			pr_debug("ImmediateData:                %s\n",
1663 				param->value);
1664 		} else if (!strcmp(param->name, MAXBURSTLENGTH)) {
1665 			ops->MaxBurstLength =
1666 				simple_strtoul(param->value, &tmpptr, 0);
1667 			pr_debug("MaxBurstLength:               %s\n",
1668 				param->value);
1669 		} else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1670 			ops->FirstBurstLength =
1671 				simple_strtoul(param->value, &tmpptr, 0);
1672 			pr_debug("FirstBurstLength:             %s\n",
1673 				param->value);
1674 		} else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1675 			ops->DefaultTime2Wait =
1676 				simple_strtoul(param->value, &tmpptr, 0);
1677 			pr_debug("DefaultTime2Wait:             %s\n",
1678 				param->value);
1679 		} else if (!strcmp(param->name, DEFAULTTIME2RETAIN)) {
1680 			ops->DefaultTime2Retain =
1681 				simple_strtoul(param->value, &tmpptr, 0);
1682 			pr_debug("DefaultTime2Retain:           %s\n",
1683 				param->value);
1684 		} else if (!strcmp(param->name, MAXOUTSTANDINGR2T)) {
1685 			ops->MaxOutstandingR2T =
1686 				simple_strtoul(param->value, &tmpptr, 0);
1687 			pr_debug("MaxOutstandingR2T:            %s\n",
1688 				param->value);
1689 		} else if (!strcmp(param->name, DATAPDUINORDER)) {
1690 			ops->DataPDUInOrder = !strcmp(param->value, YES);
1691 			pr_debug("DataPDUInOrder:               %s\n",
1692 				param->value);
1693 		} else if (!strcmp(param->name, DATASEQUENCEINORDER)) {
1694 			ops->DataSequenceInOrder = !strcmp(param->value, YES);
1695 			pr_debug("DataSequenceInOrder:          %s\n",
1696 				param->value);
1697 		} else if (!strcmp(param->name, ERRORRECOVERYLEVEL)) {
1698 			ops->ErrorRecoveryLevel =
1699 				simple_strtoul(param->value, &tmpptr, 0);
1700 			pr_debug("ErrorRecoveryLevel:           %s\n",
1701 				param->value);
1702 		} else if (!strcmp(param->name, SESSIONTYPE)) {
1703 			ops->SessionType = !strcmp(param->value, DISCOVERY);
1704 			pr_debug("SessionType:                  %s\n",
1705 				param->value);
1706 		} else if (!strcmp(param->name, RDMAEXTENSIONS)) {
1707 			ops->RDMAExtensions = !strcmp(param->value, YES);
1708 			pr_debug("RDMAExtensions:               %s\n",
1709 				param->value);
1710 		}
1711 	}
1712 	pr_debug("----------------------------------------------------"
1713 			"--------------\n");
1714 
1715 }
1716