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
  17int 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
  39int 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
  70void 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
  80void 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
 110void 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
 118static 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;
 183out:
 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 */
 194int 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;
 428out:
 429	iscsi_release_param_list(pl);
 430	return -1;
 431}
 432
 433int 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
 514int 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
 561int 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
 622err_out:
 623	iscsi_release_param_list(param_list);
 624	return -ENOMEM;
 625}
 626
 627static 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
 638void 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
 656struct 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}
 675EXPORT_SYMBOL(iscsi_find_param_from_key);
 676
 677int 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
 693int 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
 708static 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	strscpy(extra_response->key, key, sizeof(extra_response->key));
 730	strscpy(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
 738static 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
 760static 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
 798static 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
 809static 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
 876static 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
 912static 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
 953out:
 954	return proposer_values;
 955}
 956
 957static 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
1081static 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
1110static 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
1188static 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
1222static 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		char *phase_name;
1266
1267		switch (phase) {
1268		case PHASE_SECURITY:
1269			phase_name = "Security";
1270			break;
1271		case PHASE_OPERATIONAL:
1272			phase_name = "Operational";
1273			break;
1274		default:
1275			phase_name = "Unknown";
1276		}
1277		pr_err("Key \"%s\" may not be negotiated during %s phase.\n",
1278				param->name, phase_name);
1279		return NULL;
1280	}
1281
1282	return param;
1283}
1284
1285static int iscsi_enforce_integrity_rules(
1286	u8 phase,
1287	struct iscsi_param_list *param_list)
1288{
1289	char *tmpptr;
1290	u8 DataSequenceInOrder = 0;
1291	u8 ErrorRecoveryLevel = 0, SessionType = 0;
1292	u32 FirstBurstLength = 0, MaxBurstLength = 0;
1293	struct iscsi_param *param = NULL;
1294
1295	list_for_each_entry(param, &param_list->param_list, p_list) {
1296		if (!(param->phase & phase))
1297			continue;
1298		if (!strcmp(param->name, SESSIONTYPE))
1299			if (!strcmp(param->value, NORMAL))
1300				SessionType = 1;
1301		if (!strcmp(param->name, ERRORRECOVERYLEVEL))
1302			ErrorRecoveryLevel = simple_strtoul(param->value,
1303					&tmpptr, 0);
1304		if (!strcmp(param->name, DATASEQUENCEINORDER))
1305			if (!strcmp(param->value, YES))
1306				DataSequenceInOrder = 1;
1307		if (!strcmp(param->name, MAXBURSTLENGTH))
1308			MaxBurstLength = simple_strtoul(param->value,
1309					&tmpptr, 0);
1310	}
1311
1312	list_for_each_entry(param, &param_list->param_list, p_list) {
1313		if (!(param->phase & phase))
1314			continue;
1315		if (!SessionType && !IS_PSTATE_ACCEPTOR(param))
1316			continue;
1317		if (!strcmp(param->name, MAXOUTSTANDINGR2T) &&
1318		    DataSequenceInOrder && (ErrorRecoveryLevel > 0)) {
1319			if (strcmp(param->value, "1")) {
1320				if (iscsi_update_param_value(param, "1") < 0)
1321					return -1;
1322				pr_debug("Reset \"%s\" to \"%s\".\n",
1323					param->name, param->value);
1324			}
1325		}
1326		if (!strcmp(param->name, MAXCONNECTIONS) && !SessionType) {
1327			if (strcmp(param->value, "1")) {
1328				if (iscsi_update_param_value(param, "1") < 0)
1329					return -1;
1330				pr_debug("Reset \"%s\" to \"%s\".\n",
1331					param->name, param->value);
1332			}
1333		}
1334		if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1335			FirstBurstLength = simple_strtoul(param->value,
1336					&tmpptr, 0);
1337			if (FirstBurstLength > MaxBurstLength) {
1338				char tmpbuf[11];
1339				memset(tmpbuf, 0, sizeof(tmpbuf));
1340				sprintf(tmpbuf, "%u", MaxBurstLength);
1341				if (iscsi_update_param_value(param, tmpbuf))
1342					return -1;
1343				pr_debug("Reset \"%s\" to \"%s\".\n",
1344					param->name, param->value);
1345			}
1346		}
1347	}
1348
1349	return 0;
1350}
1351
1352int iscsi_decode_text_input(
1353	u8 phase,
1354	u8 sender,
1355	char *textbuf,
1356	u32 length,
1357	struct iscsit_conn *conn)
1358{
1359	struct iscsi_param_list *param_list = conn->param_list;
1360	char *tmpbuf, *start = NULL, *end = NULL;
1361
1362	tmpbuf = kmemdup_nul(textbuf, length, GFP_KERNEL);
1363	if (!tmpbuf) {
1364		pr_err("Unable to allocate %u + 1 bytes for tmpbuf.\n", length);
1365		return -ENOMEM;
1366	}
1367
 
 
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
1417free_buffer:
1418	kfree(tmpbuf);
1419	return -1;
1420}
1421
1422int 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, &param_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, &param_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
1482int 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, &param_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
1502int 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
1537void 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, &param_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
1602void 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, &param_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}