drivers/target/iscsi/iscsi_target_parameters.c

   1 /*******************************************************************************
   2  * This file contains main functions related to iSCSI Parameter negotiation.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/slab.h>
  20
  21 #include <target/iscsi/iscsi_target_core.h>
  22 #include "iscsi_target_util.h"
  23 #include "iscsi_target_parameters.h"
  24
  25 int iscsi_login_rx_data(
  26         struct iscsi_conn *conn,
  27         char *buf,
  28         int length)
  29 {
  30         int rx_got;
  31         struct kvec iov;
  32
  33         memset(&iov, 0, sizeof(struct kvec));
  34         iov.iov_len     = length;
  35         iov.iov_base    = buf;
  36
  37         rx_got = rx_data(conn, &iov, 1, length);
  38         if (rx_got != length) {
  39                 pr_err("rx_data returned %d, expecting %d.\n",
  40                                 rx_got, length);
  41                 return -1;
  42         }
  43
  44         return 0 ;
  45 }
  46
  47 int iscsi_login_tx_data(
  48         struct iscsi_conn *conn,
  49         char *pdu_buf,
  50         char *text_buf,
  51         int text_length)
  52 {
  53         int length, tx_sent, iov_cnt = 1;
  54         struct kvec iov[2];
  55
  56         length = (ISCSI_HDR_LEN + text_length);
  57
  58         memset(&iov[0], 0, 2 * sizeof(struct kvec));
  59         iov[0].iov_len          = ISCSI_HDR_LEN;
  60         iov[0].iov_base         = pdu_buf;
  61
  62         if (text_buf && text_length) {
  63                 iov[1].iov_len  = text_length;
  64                 iov[1].iov_base = text_buf;
  65                 iov_cnt++;
  66         }
  67
  68         tx_sent = tx_data(conn, &iov[0], iov_cnt, length);
  69         if (tx_sent != length) {
  70                 pr_err("tx_data returned %d, expecting %d.\n",
  71                                 tx_sent, length);
  72                 return -1;
  73         }
  74
  75         return 0;
  76 }
  77
  78 void iscsi_dump_conn_ops(struct iscsi_conn_ops *conn_ops)
  79 {
  80         pr_debug("HeaderDigest: %s\n", (conn_ops->HeaderDigest) ?
  81                                 "CRC32C" : "None");
  82         pr_debug("DataDigest: %s\n", (conn_ops->DataDigest) ?
  83                                 "CRC32C" : "None");
  84         pr_debug("MaxRecvDataSegmentLength: %u\n",
  85                                 conn_ops->MaxRecvDataSegmentLength);
  86 }
  87
  88 void iscsi_dump_sess_ops(struct iscsi_sess_ops *sess_ops)
  89 {
  90         pr_debug("InitiatorName: %s\n", sess_ops->InitiatorName);
  91         pr_debug("InitiatorAlias: %s\n", sess_ops->InitiatorAlias);
  92         pr_debug("TargetName: %s\n", sess_ops->TargetName);
  93         pr_debug("TargetAlias: %s\n", sess_ops->TargetAlias);
  94         pr_debug("TargetPortalGroupTag: %hu\n",
  95                         sess_ops->TargetPortalGroupTag);
  96         pr_debug("MaxConnections: %hu\n", sess_ops->MaxConnections);
  97         pr_debug("InitialR2T: %s\n",
  98                         (sess_ops->InitialR2T) ? "Yes" : "No");
  99         pr_debug("ImmediateData: %s\n", (sess_ops->ImmediateData) ?
 100                         "Yes" : "No");
 101         pr_debug("MaxBurstLength: %u\n", sess_ops->MaxBurstLength);
 102         pr_debug("FirstBurstLength: %u\n", sess_ops->FirstBurstLength);
 103         pr_debug("DefaultTime2Wait: %hu\n", sess_ops->DefaultTime2Wait);
 104         pr_debug("DefaultTime2Retain: %hu\n",
 105                         sess_ops->DefaultTime2Retain);
 106         pr_debug("MaxOutstandingR2T: %hu\n",
 107                         sess_ops->MaxOutstandingR2T);
 108         pr_debug("DataPDUInOrder: %s\n",
 109                         (sess_ops->DataPDUInOrder) ? "Yes" : "No");
 110         pr_debug("DataSequenceInOrder: %s\n",
 111                         (sess_ops->DataSequenceInOrder) ? "Yes" : "No");
 112         pr_debug("ErrorRecoveryLevel: %hu\n",
 113                         sess_ops->ErrorRecoveryLevel);
 114         pr_debug("SessionType: %s\n", (sess_ops->SessionType) ?
 115                         "Discovery" : "Normal");
 116 }
 117
 118 void iscsi_print_params(struct iscsi_param_list *param_list)
 119 {
 120         struct iscsi_param *param;
 121
 122         list_for_each_entry(param, &param_list->param_list, p_list)
 123                 pr_debug("%s: %s\n", param->name, param->value);
 124 }
 125
 126 static struct iscsi_param *iscsi_set_default_param(struct iscsi_param_list *param_list,
 127                 char *name, char *value, u8 phase, u8 scope, u8 sender,
 128                 u16 type_range, u8 use)
 129 {
 130         struct iscsi_param *param = NULL;
 131
 132         param = kzalloc(sizeof(struct iscsi_param), GFP_KERNEL);
 133         if (!param) {
 134                 pr_err("Unable to allocate memory for parameter.\n");
 135                 goto out;
 136         }
 137         INIT_LIST_HEAD(&param->p_list);
 138
 139         param->name = kstrdup(name, GFP_KERNEL);
 140         if (!param->name) {
 141                 pr_err("Unable to allocate memory for parameter name.\n");
 142                 goto out;
 143         }
 144
 145         param->value = kstrdup(value, GFP_KERNEL);
 146         if (!param->value) {
 147                 pr_err("Unable to allocate memory for parameter value.\n");
 148                 goto out;
 149         }
 150
 151         param->phase            = phase;
 152         param->scope            = scope;
 153         param->sender           = sender;
 154         param->use              = use;
 155         param->type_range       = type_range;
 156
 157         switch (param->type_range) {
 158         case TYPERANGE_BOOL_AND:
 159                 param->type = TYPE_BOOL_AND;
 160                 break;
 161         case TYPERANGE_BOOL_OR:
 162                 param->type = TYPE_BOOL_OR;
 163                 break;
 164         case TYPERANGE_0_TO_2:
 165         case TYPERANGE_0_TO_3600:
 166         case TYPERANGE_0_TO_32767:
 167         case TYPERANGE_0_TO_65535:
 168         case TYPERANGE_1_TO_65535:
 169         case TYPERANGE_2_TO_3600:
 170         case TYPERANGE_512_TO_16777215:
 171                 param->type = TYPE_NUMBER;
 172                 break;
 173         case TYPERANGE_AUTH:
 174         case TYPERANGE_DIGEST:
 175                 param->type = TYPE_VALUE_LIST | TYPE_STRING;
 176                 break;
 177         case TYPERANGE_ISCSINAME:
 178         case TYPERANGE_SESSIONTYPE:
 179         case TYPERANGE_TARGETADDRESS:
 180         case TYPERANGE_UTF8:
 181                 param->type = TYPE_STRING;
 182                 break;
 183         default:
 184                 pr_err("Unknown type_range 0x%02x\n",
 185                                 param->type_range);
 186                 goto out;
 187         }
 188         list_add_tail(&param->p_list, &param_list->param_list);
 189
 190         return param;
 191 out:
 192         if (param) {
 193                 kfree(param->value);
 194                 kfree(param->name);
 195                 kfree(param);
 196         }
 197
 198         return NULL;
 199 }
 200
 201 /* #warning Add extension keys */
 202 int iscsi_create_default_params(struct iscsi_param_list **param_list_ptr)
 203 {
 204         struct iscsi_param *param = NULL;
 205         struct iscsi_param_list *pl;
 206
 207         pl = kzalloc(sizeof(struct iscsi_param_list), GFP_KERNEL);
 208         if (!pl) {
 209                 pr_err("Unable to allocate memory for"
 210                                 " struct iscsi_param_list.\n");
 211                 return -ENOMEM;
 212         }
 213         INIT_LIST_HEAD(&pl->param_list);
 214         INIT_LIST_HEAD(&pl->extra_response_list);
 215
 216         /*
 217          * The format for setting the initial parameter definitions are:
 218          *
 219          * Parameter name:
 220          * Initial value:
 221          * Allowable phase:
 222          * Scope:
 223          * Allowable senders:
 224          * Typerange:
 225          * Use:
 226          */
 227         param = iscsi_set_default_param(pl, AUTHMETHOD, INITIAL_AUTHMETHOD,
 228                         PHASE_SECURITY, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 229                         TYPERANGE_AUTH, USE_INITIAL_ONLY);
 230         if (!param)
 231                 goto out;
 232
 233         param = iscsi_set_default_param(pl, HEADERDIGEST, INITIAL_HEADERDIGEST,
 234                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 235                         TYPERANGE_DIGEST, USE_INITIAL_ONLY);
 236         if (!param)
 237                 goto out;
 238
 239         param = iscsi_set_default_param(pl, DATADIGEST, INITIAL_DATADIGEST,
 240                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 241                         TYPERANGE_DIGEST, USE_INITIAL_ONLY);
 242         if (!param)
 243                 goto out;
 244
 245         param = iscsi_set_default_param(pl, MAXCONNECTIONS,
 246                         INITIAL_MAXCONNECTIONS, PHASE_OPERATIONAL,
 247                         SCOPE_SESSION_WIDE, SENDER_BOTH,
 248                         TYPERANGE_1_TO_65535, USE_LEADING_ONLY);
 249         if (!param)
 250                 goto out;
 251
 252         param = iscsi_set_default_param(pl, SENDTARGETS, INITIAL_SENDTARGETS,
 253                         PHASE_FFP0, SCOPE_SESSION_WIDE, SENDER_INITIATOR,
 254                         TYPERANGE_UTF8, 0);
 255         if (!param)
 256                 goto out;
 257
 258         param = iscsi_set_default_param(pl, TARGETNAME, INITIAL_TARGETNAME,
 259                         PHASE_DECLARATIVE, SCOPE_SESSION_WIDE, SENDER_BOTH,
 260                         TYPERANGE_ISCSINAME, USE_ALL);
 261         if (!param)
 262                 goto out;
 263
 264         param = iscsi_set_default_param(pl, INITIATORNAME,
 265                         INITIAL_INITIATORNAME, PHASE_DECLARATIVE,
 266                         SCOPE_SESSION_WIDE, SENDER_INITIATOR,
 267                         TYPERANGE_ISCSINAME, USE_INITIAL_ONLY);
 268         if (!param)
 269                 goto out;
 270
 271         param = iscsi_set_default_param(pl, TARGETALIAS, INITIAL_TARGETALIAS,
 272                         PHASE_DECLARATIVE, SCOPE_SESSION_WIDE, SENDER_TARGET,
 273                         TYPERANGE_UTF8, USE_ALL);
 274         if (!param)
 275                 goto out;
 276
 277         param = iscsi_set_default_param(pl, INITIATORALIAS,
 278                         INITIAL_INITIATORALIAS, PHASE_DECLARATIVE,
 279                         SCOPE_SESSION_WIDE, SENDER_INITIATOR, TYPERANGE_UTF8,
 280                         USE_ALL);
 281         if (!param)
 282                 goto out;
 283
 284         param = iscsi_set_default_param(pl, TARGETADDRESS,
 285                         INITIAL_TARGETADDRESS, PHASE_DECLARATIVE,
 286                         SCOPE_SESSION_WIDE, SENDER_TARGET,
 287                         TYPERANGE_TARGETADDRESS, USE_ALL);
 288         if (!param)
 289                 goto out;
 290
 291         param = iscsi_set_default_param(pl, TARGETPORTALGROUPTAG,
 292                         INITIAL_TARGETPORTALGROUPTAG,
 293                         PHASE_DECLARATIVE, SCOPE_SESSION_WIDE, SENDER_TARGET,
 294                         TYPERANGE_0_TO_65535, USE_INITIAL_ONLY);
 295         if (!param)
 296                 goto out;
 297
 298         param = iscsi_set_default_param(pl, INITIALR2T, INITIAL_INITIALR2T,
 299                         PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 300                         TYPERANGE_BOOL_OR, USE_LEADING_ONLY);
 301         if (!param)
 302                 goto out;
 303
 304         param = iscsi_set_default_param(pl, IMMEDIATEDATA,
 305                         INITIAL_IMMEDIATEDATA, PHASE_OPERATIONAL,
 306                         SCOPE_SESSION_WIDE, SENDER_BOTH, TYPERANGE_BOOL_AND,
 307                         USE_LEADING_ONLY);
 308         if (!param)
 309                 goto out;
 310
 311         param = iscsi_set_default_param(pl, MAXXMITDATASEGMENTLENGTH,
 312                         INITIAL_MAXXMITDATASEGMENTLENGTH,
 313                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 314                         TYPERANGE_512_TO_16777215, USE_ALL);
 315         if (!param)
 316                 goto out;
 317
 318         param = iscsi_set_default_param(pl, MAXRECVDATASEGMENTLENGTH,
 319                         INITIAL_MAXRECVDATASEGMENTLENGTH,
 320                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 321                         TYPERANGE_512_TO_16777215, USE_ALL);
 322         if (!param)
 323                 goto out;
 324
 325         param = iscsi_set_default_param(pl, MAXBURSTLENGTH,
 326                         INITIAL_MAXBURSTLENGTH, PHASE_OPERATIONAL,
 327                         SCOPE_SESSION_WIDE, SENDER_BOTH,
 328                         TYPERANGE_512_TO_16777215, USE_LEADING_ONLY);
 329         if (!param)
 330                 goto out;
 331
 332         param = iscsi_set_default_param(pl, FIRSTBURSTLENGTH,
 333                         INITIAL_FIRSTBURSTLENGTH,
 334                         PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 335                         TYPERANGE_512_TO_16777215, USE_LEADING_ONLY);
 336         if (!param)
 337                 goto out;
 338
 339         param = iscsi_set_default_param(pl, DEFAULTTIME2WAIT,
 340                         INITIAL_DEFAULTTIME2WAIT,
 341                         PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 342                         TYPERANGE_0_TO_3600, USE_LEADING_ONLY);
 343         if (!param)
 344                 goto out;
 345
 346         param = iscsi_set_default_param(pl, DEFAULTTIME2RETAIN,
 347                         INITIAL_DEFAULTTIME2RETAIN,
 348                         PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 349                         TYPERANGE_0_TO_3600, USE_LEADING_ONLY);
 350         if (!param)
 351                 goto out;
 352
 353         param = iscsi_set_default_param(pl, MAXOUTSTANDINGR2T,
 354                         INITIAL_MAXOUTSTANDINGR2T,
 355                         PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 356                         TYPERANGE_1_TO_65535, USE_LEADING_ONLY);
 357         if (!param)
 358                 goto out;
 359
 360         param = iscsi_set_default_param(pl, DATAPDUINORDER,
 361                         INITIAL_DATAPDUINORDER, PHASE_OPERATIONAL,
 362                         SCOPE_SESSION_WIDE, SENDER_BOTH, TYPERANGE_BOOL_OR,
 363                         USE_LEADING_ONLY);
 364         if (!param)
 365                 goto out;
 366
 367         param = iscsi_set_default_param(pl, DATASEQUENCEINORDER,
 368                         INITIAL_DATASEQUENCEINORDER,
 369                         PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 370                         TYPERANGE_BOOL_OR, USE_LEADING_ONLY);
 371         if (!param)
 372                 goto out;
 373
 374         param = iscsi_set_default_param(pl, ERRORRECOVERYLEVEL,
 375                         INITIAL_ERRORRECOVERYLEVEL,
 376                         PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 377                         TYPERANGE_0_TO_2, USE_LEADING_ONLY);
 378         if (!param)
 379                 goto out;
 380
 381         param = iscsi_set_default_param(pl, SESSIONTYPE, INITIAL_SESSIONTYPE,
 382                         PHASE_DECLARATIVE, SCOPE_SESSION_WIDE, SENDER_INITIATOR,
 383                         TYPERANGE_SESSIONTYPE, USE_LEADING_ONLY);
 384         if (!param)
 385                 goto out;
 386
 387         param = iscsi_set_default_param(pl, IFMARKER, INITIAL_IFMARKER,
 388                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 389                         TYPERANGE_BOOL_AND, USE_INITIAL_ONLY);
 390         if (!param)
 391                 goto out;
 392
 393         param = iscsi_set_default_param(pl, OFMARKER, INITIAL_OFMARKER,
 394                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 395                         TYPERANGE_BOOL_AND, USE_INITIAL_ONLY);
 396         if (!param)
 397                 goto out;
 398
 399         param = iscsi_set_default_param(pl, IFMARKINT, INITIAL_IFMARKINT,
 400                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 401                         TYPERANGE_UTF8, USE_INITIAL_ONLY);
 402         if (!param)
 403                 goto out;
 404
 405         param = iscsi_set_default_param(pl, OFMARKINT, INITIAL_OFMARKINT,
 406                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 407                         TYPERANGE_UTF8, USE_INITIAL_ONLY);
 408         if (!param)
 409                 goto out;
 410
 411         /*
 412          * Extra parameters for ISER from RFC-5046
 413          */
 414         param = iscsi_set_default_param(pl, RDMAEXTENSIONS, INITIAL_RDMAEXTENSIONS,
 415                         PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 416                         TYPERANGE_BOOL_AND, USE_LEADING_ONLY);
 417         if (!param)
 418                 goto out;
 419
 420         param = iscsi_set_default_param(pl, INITIATORRECVDATASEGMENTLENGTH,
 421                         INITIAL_INITIATORRECVDATASEGMENTLENGTH,
 422                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 423                         TYPERANGE_512_TO_16777215, USE_ALL);
 424         if (!param)
 425                 goto out;
 426
 427         param = iscsi_set_default_param(pl, TARGETRECVDATASEGMENTLENGTH,
 428                         INITIAL_TARGETRECVDATASEGMENTLENGTH,
 429                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
 430                         TYPERANGE_512_TO_16777215, USE_ALL);
 431         if (!param)
 432                 goto out;
 433
 434         *param_list_ptr = pl;
 435         return 0;
 436 out:
 437         iscsi_release_param_list(pl);
 438         return -1;
 439 }
 440
 441 int iscsi_set_keys_to_negotiate(
 442         struct iscsi_param_list *param_list,
 443         bool iser)
 444 {
 445         struct iscsi_param *param;
 446
 447         param_list->iser = iser;
 448
 449         list_for_each_entry(param, &param_list->param_list, p_list) {
 450                 param->state = 0;
 451                 if (!strcmp(param->name, AUTHMETHOD)) {
 452                         SET_PSTATE_NEGOTIATE(param);
 453                 } else if (!strcmp(param->name, HEADERDIGEST)) {
 454                         if (!iser)
 455                                 SET_PSTATE_NEGOTIATE(param);
 456                 } else if (!strcmp(param->name, DATADIGEST)) {
 457                         if (!iser)
 458                                 SET_PSTATE_NEGOTIATE(param);
 459                 } else if (!strcmp(param->name, MAXCONNECTIONS)) {
 460                         SET_PSTATE_NEGOTIATE(param);
 461                 } else if (!strcmp(param->name, TARGETNAME)) {
 462                         continue;
 463                 } else if (!strcmp(param->name, INITIATORNAME)) {
 464                         continue;
 465                 } else if (!strcmp(param->name, TARGETALIAS)) {
 466                         if (param->value)
 467                                 SET_PSTATE_NEGOTIATE(param);
 468                 } else if (!strcmp(param->name, INITIATORALIAS)) {
 469                         continue;
 470                 } else if (!strcmp(param->name, TARGETPORTALGROUPTAG)) {
 471                         SET_PSTATE_NEGOTIATE(param);
 472                 } else if (!strcmp(param->name, INITIALR2T)) {
 473                         SET_PSTATE_NEGOTIATE(param);
 474                 } else if (!strcmp(param->name, IMMEDIATEDATA)) {
 475                         SET_PSTATE_NEGOTIATE(param);
 476                 } else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
 477                         if (!iser)
 478                                 SET_PSTATE_NEGOTIATE(param);
 479                 } else if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
 480                         continue;
 481                 } else if (!strcmp(param->name, MAXBURSTLENGTH)) {
 482                         SET_PSTATE_NEGOTIATE(param);
 483                 } else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
 484                         SET_PSTATE_NEGOTIATE(param);
 485                 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
 486                         SET_PSTATE_NEGOTIATE(param);
 487                 } else if (!strcmp(param->name, DEFAULTTIME2RETAIN)) {
 488                         SET_PSTATE_NEGOTIATE(param);
 489                 } else if (!strcmp(param->name, MAXOUTSTANDINGR2T)) {
 490                         SET_PSTATE_NEGOTIATE(param);
 491                 } else if (!strcmp(param->name, DATAPDUINORDER)) {
 492                         SET_PSTATE_NEGOTIATE(param);
 493                 } else if (!strcmp(param->name, DATASEQUENCEINORDER)) {
 494                         SET_PSTATE_NEGOTIATE(param);
 495                 } else if (!strcmp(param->name, ERRORRECOVERYLEVEL)) {
 496                         SET_PSTATE_NEGOTIATE(param);
 497                 } else if (!strcmp(param->name, SESSIONTYPE)) {
 498                         SET_PSTATE_NEGOTIATE(param);
 499                 } else if (!strcmp(param->name, IFMARKER)) {
 500                         SET_PSTATE_REJECT(param);
 501                 } else if (!strcmp(param->name, OFMARKER)) {
 502                         SET_PSTATE_REJECT(param);
 503                 } else if (!strcmp(param->name, IFMARKINT)) {
 504                         SET_PSTATE_REJECT(param);
 505                 } else if (!strcmp(param->name, OFMARKINT)) {
 506                         SET_PSTATE_REJECT(param);
 507                 } else if (!strcmp(param->name, RDMAEXTENSIONS)) {
 508                         if (iser)
 509                                 SET_PSTATE_NEGOTIATE(param);
 510                 } else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
 511                         if (iser)
 512                                 SET_PSTATE_NEGOTIATE(param);
 513                 } else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
 514                         if (iser)
 515                                 SET_PSTATE_NEGOTIATE(param);
 516                 }
 517         }
 518
 519         return 0;
 520 }
 521
 522 int iscsi_set_keys_irrelevant_for_discovery(
 523         struct iscsi_param_list *param_list)
 524 {
 525         struct iscsi_param *param;
 526
 527         list_for_each_entry(param, &param_list->param_list, p_list) {
 528                 if (!strcmp(param->name, MAXCONNECTIONS))
 529                         param->state &= ~PSTATE_NEGOTIATE;
 530                 else if (!strcmp(param->name, INITIALR2T))
 531                         param->state &= ~PSTATE_NEGOTIATE;
 532                 else if (!strcmp(param->name, IMMEDIATEDATA))
 533                         param->state &= ~PSTATE_NEGOTIATE;
 534                 else if (!strcmp(param->name, MAXBURSTLENGTH))
 535                         param->state &= ~PSTATE_NEGOTIATE;
 536                 else if (!strcmp(param->name, FIRSTBURSTLENGTH))
 537                         param->state &= ~PSTATE_NEGOTIATE;
 538                 else if (!strcmp(param->name, MAXOUTSTANDINGR2T))
 539                         param->state &= ~PSTATE_NEGOTIATE;
 540                 else if (!strcmp(param->name, DATAPDUINORDER))
 541                         param->state &= ~PSTATE_NEGOTIATE;
 542                 else if (!strcmp(param->name, DATASEQUENCEINORDER))
 543                         param->state &= ~PSTATE_NEGOTIATE;
 544                 else if (!strcmp(param->name, ERRORRECOVERYLEVEL))
 545                         param->state &= ~PSTATE_NEGOTIATE;
 546                 else if (!strcmp(param->name, DEFAULTTIME2WAIT))
 547                         param->state &= ~PSTATE_NEGOTIATE;
 548                 else if (!strcmp(param->name, DEFAULTTIME2RETAIN))
 549                         param->state &= ~PSTATE_NEGOTIATE;
 550                 else if (!strcmp(param->name, IFMARKER))
 551                         param->state &= ~PSTATE_NEGOTIATE;
 552                 else if (!strcmp(param->name, OFMARKER))
 553                         param->state &= ~PSTATE_NEGOTIATE;
 554                 else if (!strcmp(param->name, IFMARKINT))
 555                         param->state &= ~PSTATE_NEGOTIATE;
 556                 else if (!strcmp(param->name, OFMARKINT))
 557                         param->state &= ~PSTATE_NEGOTIATE;
 558                 else if (!strcmp(param->name, RDMAEXTENSIONS))
 559                         param->state &= ~PSTATE_NEGOTIATE;
 560                 else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH))
 561                         param->state &= ~PSTATE_NEGOTIATE;
 562                 else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH))
 563                         param->state &= ~PSTATE_NEGOTIATE;
 564         }
 565
 566         return 0;
 567 }
 568
 569 int iscsi_copy_param_list(
 570         struct iscsi_param_list **dst_param_list,
 571         struct iscsi_param_list *src_param_list,
 572         int leading)
 573 {
 574         struct iscsi_param *param = NULL;
 575         struct iscsi_param *new_param = NULL;
 576         struct iscsi_param_list *param_list = NULL;
 577
 578         param_list = kzalloc(sizeof(struct iscsi_param_list), GFP_KERNEL);
 579         if (!param_list) {
 580                 pr_err("Unable to allocate memory for struct iscsi_param_list.\n");
 581                 return -ENOMEM;
 582         }
 583         INIT_LIST_HEAD(&param_list->param_list);
 584         INIT_LIST_HEAD(&param_list->extra_response_list);
 585
 586         list_for_each_entry(param, &src_param_list->param_list, p_list) {
 587                 if (!leading && (param->scope & SCOPE_SESSION_WIDE)) {
 588                         if ((strcmp(param->name, "TargetName") != 0) &&
 589                             (strcmp(param->name, "InitiatorName") != 0) &&
 590                             (strcmp(param->name, "TargetPortalGroupTag") != 0))
 591                                 continue;
 592                 }
 593
 594                 new_param = kzalloc(sizeof(struct iscsi_param), GFP_KERNEL);
 595                 if (!new_param) {
 596                         pr_err("Unable to allocate memory for struct iscsi_param.\n");
 597                         goto err_out;
 598                 }
 599
 600                 new_param->name = kstrdup(param->name, GFP_KERNEL);
 601                 new_param->value = kstrdup(param->value, GFP_KERNEL);
 602                 if (!new_param->value || !new_param->name) {
 603                         kfree(new_param->value);
 604                         kfree(new_param->name);
 605                         kfree(new_param);
 606                         pr_err("Unable to allocate memory for parameter name/value.\n");
 607                         goto err_out;
 608                 }
 609
 610                 new_param->set_param = param->set_param;
 611                 new_param->phase = param->phase;
 612                 new_param->scope = param->scope;
 613                 new_param->sender = param->sender;
 614                 new_param->type = param->type;
 615                 new_param->use = param->use;
 616                 new_param->type_range = param->type_range;
 617
 618                 list_add_tail(&new_param->p_list, &param_list->param_list);
 619         }
 620
 621         if (!list_empty(&param_list->param_list)) {
 622                 *dst_param_list = param_list;
 623         } else {
 624                 pr_err("No parameters allocated.\n");
 625                 goto err_out;
 626         }
 627
 628         return 0;
 629
 630 err_out:
 631         iscsi_release_param_list(param_list);
 632         return -ENOMEM;
 633 }
 634
 635 static void iscsi_release_extra_responses(struct iscsi_param_list *param_list)
 636 {
 637         struct iscsi_extra_response *er, *er_tmp;
 638
 639         list_for_each_entry_safe(er, er_tmp, &param_list->extra_response_list,
 640                         er_list) {
 641                 list_del(&er->er_list);
 642                 kfree(er);
 643         }
 644 }
 645
 646 void iscsi_release_param_list(struct iscsi_param_list *param_list)
 647 {
 648         struct iscsi_param *param, *param_tmp;
 649
 650         list_for_each_entry_safe(param, param_tmp, &param_list->param_list,
 651                         p_list) {
 652                 list_del(&param->p_list);
 653
 654                 kfree(param->name);
 655                 kfree(param->value);
 656                 kfree(param);
 657         }
 658
 659         iscsi_release_extra_responses(param_list);
 660
 661         kfree(param_list);
 662 }
 663
 664 struct iscsi_param *iscsi_find_param_from_key(
 665         char *key,
 666         struct iscsi_param_list *param_list)
 667 {
 668         struct iscsi_param *param;
 669
 670         if (!key || !param_list) {
 671                 pr_err("Key or parameter list pointer is NULL.\n");
 672                 return NULL;
 673         }
 674
 675         list_for_each_entry(param, &param_list->param_list, p_list) {
 676                 if (!strcmp(key, param->name))
 677                         return param;
 678         }
 679
 680         pr_err("Unable to locate key \"%s\".\n", key);
 681         return NULL;
 682 }
 683
 684 int iscsi_extract_key_value(char *textbuf, char **key, char **value)
 685 {
 686         *value = strchr(textbuf, '=');
 687         if (!*value) {
 688                 pr_err("Unable to locate \"=\" separator for key,"
 689                                 " ignoring request.\n");
 690                 return -1;
 691         }
 692
 693         *key = textbuf;
 694         **value = '\0';
 695         *value = *value + 1;
 696
 697         return 0;
 698 }
 699
 700 int iscsi_update_param_value(struct iscsi_param *param, char *value)
 701 {
 702         kfree(param->value);
 703
 704         param->value = kstrdup(value, GFP_KERNEL);
 705         if (!param->value) {
 706                 pr_err("Unable to allocate memory for value.\n");
 707                 return -ENOMEM;
 708         }
 709
 710         pr_debug("iSCSI Parameter updated to %s=%s\n",
 711                         param->name, param->value);
 712         return 0;
 713 }
 714
 715 static int iscsi_add_notunderstood_response(
 716         char *key,
 717         char *value,
 718         struct iscsi_param_list *param_list)
 719 {
 720         struct iscsi_extra_response *extra_response;
 721
 722         if (strlen(value) > VALUE_MAXLEN) {
 723                 pr_err("Value for notunderstood key \"%s\" exceeds %d,"
 724                         " protocol error.\n", key, VALUE_MAXLEN);
 725                 return -1;
 726         }
 727
 728         extra_response = kzalloc(sizeof(struct iscsi_extra_response), GFP_KERNEL);
 729         if (!extra_response) {
 730                 pr_err("Unable to allocate memory for"
 731                         " struct iscsi_extra_response.\n");
 732                 return -ENOMEM;
 733         }
 734         INIT_LIST_HEAD(&extra_response->er_list);
 735
 736         strlcpy(extra_response->key, key, sizeof(extra_response->key));
 737         strlcpy(extra_response->value, NOTUNDERSTOOD,
 738                 sizeof(extra_response->value));
 739
 740         list_add_tail(&extra_response->er_list,
 741                         &param_list->extra_response_list);
 742         return 0;
 743 }
 744
 745 static int iscsi_check_for_auth_key(char *key)
 746 {
 747         /*
 748          * RFC 1994
 749          */
 750         if (!strcmp(key, "CHAP_A") || !strcmp(key, "CHAP_I") ||
 751             !strcmp(key, "CHAP_C") || !strcmp(key, "CHAP_N") ||
 752             !strcmp(key, "CHAP_R"))
 753                 return 1;
 754
 755         /*
 756          * RFC 2945
 757          */
 758         if (!strcmp(key, "SRP_U") || !strcmp(key, "SRP_N") ||
 759             !strcmp(key, "SRP_g") || !strcmp(key, "SRP_s") ||
 760             !strcmp(key, "SRP_A") || !strcmp(key, "SRP_B") ||
 761             !strcmp(key, "SRP_M") || !strcmp(key, "SRP_HM"))
 762                 return 1;
 763
 764         return 0;
 765 }
 766
 767 static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param,
 768                                                     bool keys_workaround)
 769 {
 770         if (IS_TYPE_BOOL_AND(param)) {
 771                 if (!strcmp(param->value, NO))
 772                         SET_PSTATE_REPLY_OPTIONAL(param);
 773         } else if (IS_TYPE_BOOL_OR(param)) {
 774                 if (!strcmp(param->value, YES))
 775                         SET_PSTATE_REPLY_OPTIONAL(param);
 776
 777                 if (keys_workaround) {
 778                         /*
 779                          * Required for gPXE iSCSI boot client
 780                          */
 781                         if (!strcmp(param->name, IMMEDIATEDATA))
 782                                 SET_PSTATE_REPLY_OPTIONAL(param);
 783                 }
 784         } else if (IS_TYPE_NUMBER(param)) {
 785                 if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH))
 786                         SET_PSTATE_REPLY_OPTIONAL(param);
 787
 788                 if (keys_workaround) {
 789                         /*
 790                          * Required for Mellanox Flexboot PXE boot ROM
 791                          */
 792                         if (!strcmp(param->name, FIRSTBURSTLENGTH))
 793                                 SET_PSTATE_REPLY_OPTIONAL(param);
 794
 795                         /*
 796                          * Required for gPXE iSCSI boot client
 797                          */
 798                         if (!strcmp(param->name, MAXCONNECTIONS))
 799                                 SET_PSTATE_REPLY_OPTIONAL(param);
 800                 }
 801         } else if (IS_PHASE_DECLARATIVE(param))
 802                 SET_PSTATE_REPLY_OPTIONAL(param);
 803 }
 804
 805 static int iscsi_check_boolean_value(struct iscsi_param *param, char *value)
 806 {
 807         if (strcmp(value, YES) && strcmp(value, NO)) {
 808                 pr_err("Illegal value for \"%s\", must be either"
 809                         " \"%s\" or \"%s\".\n", param->name, YES, NO);
 810                 return -1;
 811         }
 812
 813         return 0;
 814 }
 815
 816 static int iscsi_check_numerical_value(struct iscsi_param *param, char *value_ptr)
 817 {
 818         char *tmpptr;
 819         int value = 0;
 820
 821         value = simple_strtoul(value_ptr, &tmpptr, 0);
 822
 823         if (IS_TYPERANGE_0_TO_2(param)) {
 824                 if ((value < 0) || (value > 2)) {
 825                         pr_err("Illegal value for \"%s\", must be"
 826                                 " between 0 and 2.\n", param->name);
 827                         return -1;
 828                 }
 829                 return 0;
 830         }
 831         if (IS_TYPERANGE_0_TO_3600(param)) {
 832                 if ((value < 0) || (value > 3600)) {
 833                         pr_err("Illegal value for \"%s\", must be"
 834                                 " between 0 and 3600.\n", param->name);
 835                         return -1;
 836                 }
 837                 return 0;
 838         }
 839         if (IS_TYPERANGE_0_TO_32767(param)) {
 840                 if ((value < 0) || (value > 32767)) {
 841                         pr_err("Illegal value for \"%s\", must be"
 842                                 " between 0 and 32767.\n", param->name);
 843                         return -1;
 844                 }
 845                 return 0;
 846         }
 847         if (IS_TYPERANGE_0_TO_65535(param)) {
 848                 if ((value < 0) || (value > 65535)) {
 849                         pr_err("Illegal value for \"%s\", must be"
 850                                 " between 0 and 65535.\n", param->name);
 851                         return -1;
 852                 }
 853                 return 0;
 854         }
 855         if (IS_TYPERANGE_1_TO_65535(param)) {
 856                 if ((value < 1) || (value > 65535)) {
 857                         pr_err("Illegal value for \"%s\", must be"
 858                                 " between 1 and 65535.\n", param->name);
 859                         return -1;
 860                 }
 861                 return 0;
 862         }
 863         if (IS_TYPERANGE_2_TO_3600(param)) {
 864                 if ((value < 2) || (value > 3600)) {
 865                         pr_err("Illegal value for \"%s\", must be"
 866                                 " between 2 and 3600.\n", param->name);
 867                         return -1;
 868                 }
 869                 return 0;
 870         }
 871         if (IS_TYPERANGE_512_TO_16777215(param)) {
 872                 if ((value < 512) || (value > 16777215)) {
 873                         pr_err("Illegal value for \"%s\", must be"
 874                                 " between 512 and 16777215.\n", param->name);
 875                         return -1;
 876                 }
 877                 return 0;
 878         }
 879
 880         return 0;
 881 }
 882
 883 static int iscsi_check_string_or_list_value(struct iscsi_param *param, char *value)
 884 {
 885         if (IS_PSTATE_PROPOSER(param))
 886                 return 0;
 887
 888         if (IS_TYPERANGE_AUTH_PARAM(param)) {
 889                 if (strcmp(value, KRB5) && strcmp(value, SPKM1) &&
 890                     strcmp(value, SPKM2) && strcmp(value, SRP) &&
 891                     strcmp(value, CHAP) && strcmp(value, NONE)) {
 892                         pr_err("Illegal value for \"%s\", must be"
 893                                 " \"%s\", \"%s\", \"%s\", \"%s\", \"%s\""
 894                                 " or \"%s\".\n", param->name, KRB5,
 895                                         SPKM1, SPKM2, SRP, CHAP, NONE);
 896                         return -1;
 897                 }
 898         }
 899         if (IS_TYPERANGE_DIGEST_PARAM(param)) {
 900                 if (strcmp(value, CRC32C) && strcmp(value, NONE)) {
 901                         pr_err("Illegal value for \"%s\", must be"
 902                                 " \"%s\" or \"%s\".\n", param->name,
 903                                         CRC32C, NONE);
 904                         return -1;
 905                 }
 906         }
 907         if (IS_TYPERANGE_SESSIONTYPE(param)) {
 908                 if (strcmp(value, DISCOVERY) && strcmp(value, NORMAL)) {
 909                         pr_err("Illegal value for \"%s\", must be"
 910                                 " \"%s\" or \"%s\".\n", param->name,
 911                                         DISCOVERY, NORMAL);
 912                         return -1;
 913                 }
 914         }
 915
 916         return 0;
 917 }
 918
 919 static char *iscsi_check_valuelist_for_support(
 920         struct iscsi_param *param,
 921         char *value)
 922 {
 923         char *tmp1 = NULL, *tmp2 = NULL;
 924         char *acceptor_values = NULL, *proposer_values = NULL;
 925
 926         acceptor_values = param->value;
 927         proposer_values = value;
 928
 929         do {
 930                 if (!proposer_values)
 931                         return NULL;
 932                 tmp1 = strchr(proposer_values, ',');
 933                 if (tmp1)
 934                         *tmp1 = '\0';
 935                 acceptor_values = param->value;
 936                 do {
 937                         if (!acceptor_values) {
 938                                 if (tmp1)
 939                                         *tmp1 = ',';
 940                                 return NULL;
 941                         }
 942                         tmp2 = strchr(acceptor_values, ',');
 943                         if (tmp2)
 944                                 *tmp2 = '\0';
 945                         if (!strcmp(acceptor_values, proposer_values)) {
 946                                 if (tmp2)
 947                                         *tmp2 = ',';
 948                                 goto out;
 949                         }
 950                         if (tmp2)
 951                                 *tmp2++ = ',';
 952
 953                         acceptor_values = tmp2;
 954                 } while (acceptor_values);
 955                 if (tmp1)
 956                         *tmp1++ = ',';
 957                 proposer_values = tmp1;
 958         } while (proposer_values);
 959
 960 out:
 961         return proposer_values;
 962 }
 963
 964 static int iscsi_check_acceptor_state(struct iscsi_param *param, char *value,
 965                                 struct iscsi_conn *conn)
 966 {
 967         u8 acceptor_boolean_value = 0, proposer_boolean_value = 0;
 968         char *negotiated_value = NULL;
 969
 970         if (IS_PSTATE_ACCEPTOR(param)) {
 971                 pr_err("Received key \"%s\" twice, protocol error.\n",
 972                                 param->name);
 973                 return -1;
 974         }
 975
 976         if (IS_PSTATE_REJECT(param))
 977                 return 0;
 978
 979         if (IS_TYPE_BOOL_AND(param)) {
 980                 if (!strcmp(value, YES))
 981                         proposer_boolean_value = 1;
 982                 if (!strcmp(param->value, YES))
 983                         acceptor_boolean_value = 1;
 984                 if (acceptor_boolean_value && proposer_boolean_value)
 985                         do {} while (0);
 986                 else {
 987                         if (iscsi_update_param_value(param, NO) < 0)
 988                                 return -1;
 989                         if (!proposer_boolean_value)
 990                                 SET_PSTATE_REPLY_OPTIONAL(param);
 991                 }
 992         } else if (IS_TYPE_BOOL_OR(param)) {
 993                 if (!strcmp(value, YES))
 994                         proposer_boolean_value = 1;
 995                 if (!strcmp(param->value, YES))
 996                         acceptor_boolean_value = 1;
 997                 if (acceptor_boolean_value || proposer_boolean_value) {
 998                         if (iscsi_update_param_value(param, YES) < 0)
 999                                 return -1;
1000                         if (proposer_boolean_value)
1001                                 SET_PSTATE_REPLY_OPTIONAL(param);
1002                 }
1003         } else if (IS_TYPE_NUMBER(param)) {
1004                 char *tmpptr, buf[11];
1005                 u32 acceptor_value = simple_strtoul(param->value, &tmpptr, 0);
1006                 u32 proposer_value = simple_strtoul(value, &tmpptr, 0);
1007
1008                 memset(buf, 0, sizeof(buf));
1009
1010                 if (!strcmp(param->name, MAXCONNECTIONS) ||
1011                     !strcmp(param->name, MAXBURSTLENGTH) ||
1012                     !strcmp(param->name, FIRSTBURSTLENGTH) ||
1013                     !strcmp(param->name, MAXOUTSTANDINGR2T) ||
1014                     !strcmp(param->name, DEFAULTTIME2RETAIN) ||
1015                     !strcmp(param->name, ERRORRECOVERYLEVEL)) {
1016                         if (proposer_value > acceptor_value) {
1017                                 sprintf(buf, "%u", acceptor_value);
1018                                 if (iscsi_update_param_value(param,
1019                                                 &buf[0]) < 0)
1020                                         return -1;
1021                         } else {
1022                                 if (iscsi_update_param_value(param, value) < 0)
1023                                         return -1;
1024                         }
1025                 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1026                         if (acceptor_value > proposer_value) {
1027                                 sprintf(buf, "%u", acceptor_value);
1028                                 if (iscsi_update_param_value(param,
1029                                                 &buf[0]) < 0)
1030                                         return -1;
1031                         } else {
1032                                 if (iscsi_update_param_value(param, value) < 0)
1033                                         return -1;
1034                         }
1035                 } else {
1036                         if (iscsi_update_param_value(param, value) < 0)
1037                                 return -1;
1038                 }
1039
1040                 if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1041                         struct iscsi_param *param_mxdsl;
1042                         unsigned long long tmp;
1043                         int rc;
1044
1045                         rc = kstrtoull(param->value, 0, &tmp);
1046                         if (rc < 0)
1047                                 return -1;
1048
1049                         conn->conn_ops->MaxRecvDataSegmentLength = tmp;
1050                         pr_debug("Saving op->MaxRecvDataSegmentLength from"
1051                                 " original initiator received value: %u\n",
1052                                 conn->conn_ops->MaxRecvDataSegmentLength);
1053
1054                         param_mxdsl = iscsi_find_param_from_key(
1055                                                 MAXXMITDATASEGMENTLENGTH,
1056                                                 conn->param_list);
1057                         if (!param_mxdsl)
1058                                 return -1;
1059
1060                         rc = iscsi_update_param_value(param,
1061                                                 param_mxdsl->value);
1062                         if (rc < 0)
1063                                 return -1;
1064
1065                         pr_debug("Updated %s to target MXDSL value: %s\n",
1066                                         param->name, param->value);
1067                 }
1068         } else if (IS_TYPE_VALUE_LIST(param)) {
1069                 negotiated_value = iscsi_check_valuelist_for_support(
1070                                         param, value);
1071                 if (!negotiated_value) {
1072                         pr_err("Proposer's value list \"%s\" contains"
1073                                 " no valid values from Acceptor's value list"
1074                                 " \"%s\".\n", value, param->value);
1075                         return -1;
1076                 }
1077                 if (iscsi_update_param_value(param, negotiated_value) < 0)
1078                         return -1;
1079         } else if (IS_PHASE_DECLARATIVE(param)) {
1080                 if (iscsi_update_param_value(param, value) < 0)
1081                         return -1;
1082                 SET_PSTATE_REPLY_OPTIONAL(param);
1083         }
1084
1085         return 0;
1086 }
1087
1088 static int iscsi_check_proposer_state(struct iscsi_param *param, char *value)
1089 {
1090         if (IS_PSTATE_RESPONSE_GOT(param)) {
1091                 pr_err("Received key \"%s\" twice, protocol error.\n",
1092                                 param->name);
1093                 return -1;
1094         }
1095
1096         if (IS_TYPE_VALUE_LIST(param)) {
1097                 char *comma_ptr = NULL, *tmp_ptr = NULL;
1098
1099                 comma_ptr = strchr(value, ',');
1100                 if (comma_ptr) {
1101                         pr_err("Illegal \",\" in response for \"%s\".\n",
1102                                         param->name);
1103                         return -1;
1104                 }
1105
1106                 tmp_ptr = iscsi_check_valuelist_for_support(param, value);
1107                 if (!tmp_ptr)
1108                         return -1;
1109         }
1110
1111         if (iscsi_update_param_value(param, value) < 0)
1112                 return -1;
1113
1114         return 0;
1115 }
1116
1117 static int iscsi_check_value(struct iscsi_param *param, char *value)
1118 {
1119         char *comma_ptr = NULL;
1120
1121         if (!strcmp(value, REJECT)) {
1122                 if (!strcmp(param->name, IFMARKINT) ||
1123                     !strcmp(param->name, OFMARKINT)) {
1124                         /*
1125                          * Reject is not fatal for [I,O]FMarkInt,  and causes
1126                          * [I,O]FMarker to be reset to No. (See iSCSI v20 A.3.2)
1127                          */
1128                         SET_PSTATE_REJECT(param);
1129                         return 0;
1130                 }
1131                 pr_err("Received %s=%s\n", param->name, value);
1132                 return -1;
1133         }
1134         if (!strcmp(value, IRRELEVANT)) {
1135                 pr_debug("Received %s=%s\n", param->name, value);
1136                 SET_PSTATE_IRRELEVANT(param);
1137                 return 0;
1138         }
1139         if (!strcmp(value, NOTUNDERSTOOD)) {
1140                 if (!IS_PSTATE_PROPOSER(param)) {
1141                         pr_err("Received illegal offer %s=%s\n",
1142                                 param->name, value);
1143                         return -1;
1144                 }
1145
1146 /* #warning FIXME: Add check for X-ExtensionKey here */
1147                 pr_err("Standard iSCSI key \"%s\" cannot be answered"
1148                         " with \"%s\", protocol error.\n", param->name, value);
1149                 return -1;
1150         }
1151
1152         do {
1153                 comma_ptr = NULL;
1154                 comma_ptr = strchr(value, ',');
1155
1156                 if (comma_ptr && !IS_TYPE_VALUE_LIST(param)) {
1157                         pr_err("Detected value separator \",\", but"
1158                                 " key \"%s\" does not allow a value list,"
1159                                 " protocol error.\n", param->name);
1160                         return -1;
1161                 }
1162                 if (comma_ptr)
1163                         *comma_ptr = '\0';
1164
1165                 if (strlen(value) > VALUE_MAXLEN) {
1166                         pr_err("Value for key \"%s\" exceeds %d,"
1167                                 " protocol error.\n", param->name,
1168                                 VALUE_MAXLEN);
1169                         return -1;
1170                 }
1171
1172                 if (IS_TYPE_BOOL_AND(param) || IS_TYPE_BOOL_OR(param)) {
1173                         if (iscsi_check_boolean_value(param, value) < 0)
1174                                 return -1;
1175                 } else if (IS_TYPE_NUMBER(param)) {
1176                         if (iscsi_check_numerical_value(param, value) < 0)
1177                                 return -1;
1178                 } else if (IS_TYPE_STRING(param) || IS_TYPE_VALUE_LIST(param)) {
1179                         if (iscsi_check_string_or_list_value(param, value) < 0)
1180                                 return -1;
1181                 } else {
1182                         pr_err("Huh? 0x%02x\n", param->type);
1183                         return -1;
1184                 }
1185
1186                 if (comma_ptr)
1187                         *comma_ptr++ = ',';
1188
1189                 value = comma_ptr;
1190         } while (value);
1191
1192         return 0;
1193 }
1194
1195 static struct iscsi_param *__iscsi_check_key(
1196         char *key,
1197         int sender,
1198         struct iscsi_param_list *param_list)
1199 {
1200         struct iscsi_param *param;
1201
1202         if (strlen(key) > KEY_MAXLEN) {
1203                 pr_err("Length of key name \"%s\" exceeds %d.\n",
1204                         key, KEY_MAXLEN);
1205                 return NULL;
1206         }
1207
1208         param = iscsi_find_param_from_key(key, param_list);
1209         if (!param)
1210                 return NULL;
1211
1212         if ((sender & SENDER_INITIATOR) && !IS_SENDER_INITIATOR(param)) {
1213                 pr_err("Key \"%s\" may not be sent to %s,"
1214                         " protocol error.\n", param->name,
1215                         (sender & SENDER_RECEIVER) ? "target" : "initiator");
1216                 return NULL;
1217         }
1218
1219         if ((sender & SENDER_TARGET) && !IS_SENDER_TARGET(param)) {
1220                 pr_err("Key \"%s\" may not be sent to %s,"
1221                         " protocol error.\n", param->name,
1222                         (sender & SENDER_RECEIVER) ? "initiator" : "target");
1223                 return NULL;
1224         }
1225
1226         return param;
1227 }
1228
1229 static struct iscsi_param *iscsi_check_key(
1230         char *key,
1231         int phase,
1232         int sender,
1233         struct iscsi_param_list *param_list)
1234 {
1235         struct iscsi_param *param;
1236         /*
1237          * Key name length must not exceed 63 bytes. (See iSCSI v20 5.1)
1238          */
1239         if (strlen(key) > KEY_MAXLEN) {
1240                 pr_err("Length of key name \"%s\" exceeds %d.\n",
1241                         key, KEY_MAXLEN);
1242                 return NULL;
1243         }
1244
1245         param = iscsi_find_param_from_key(key, param_list);
1246         if (!param)
1247                 return NULL;
1248
1249         if ((sender & SENDER_INITIATOR) && !IS_SENDER_INITIATOR(param)) {
1250                 pr_err("Key \"%s\" may not be sent to %s,"
1251                         " protocol error.\n", param->name,
1252                         (sender & SENDER_RECEIVER) ? "target" : "initiator");
1253                 return NULL;
1254         }
1255         if ((sender & SENDER_TARGET) && !IS_SENDER_TARGET(param)) {
1256                 pr_err("Key \"%s\" may not be sent to %s,"
1257                                 " protocol error.\n", param->name,
1258                         (sender & SENDER_RECEIVER) ? "initiator" : "target");
1259                 return NULL;
1260         }
1261
1262         if (IS_PSTATE_ACCEPTOR(param)) {
1263                 pr_err("Key \"%s\" received twice, protocol error.\n",
1264                                 key);
1265                 return NULL;
1266         }
1267
1268         if (!phase)
1269                 return param;
1270
1271         if (!(param->phase & phase)) {
1272                 pr_err("Key \"%s\" may not be negotiated during ",
1273                                 param->name);
1274                 switch (phase) {
1275                 case PHASE_SECURITY:
1276                         pr_debug("Security phase.\n");
1277                         break;
1278                 case PHASE_OPERATIONAL:
1279                         pr_debug("Operational phase.\n");
1280                         break;
1281                 default:
1282                         pr_debug("Unknown phase.\n");
1283                 }
1284                 return NULL;
1285         }
1286
1287         return param;
1288 }
1289
1290 static int iscsi_enforce_integrity_rules(
1291         u8 phase,
1292         struct iscsi_param_list *param_list)
1293 {
1294         char *tmpptr;
1295         u8 DataSequenceInOrder = 0;
1296         u8 ErrorRecoveryLevel = 0, SessionType = 0;
1297         u32 FirstBurstLength = 0, MaxBurstLength = 0;
1298         struct iscsi_param *param = NULL;
1299
1300         list_for_each_entry(param, &param_list->param_list, p_list) {
1301                 if (!(param->phase & phase))
1302                         continue;
1303                 if (!strcmp(param->name, SESSIONTYPE))
1304                         if (!strcmp(param->value, NORMAL))
1305                                 SessionType = 1;
1306                 if (!strcmp(param->name, ERRORRECOVERYLEVEL))
1307                         ErrorRecoveryLevel = simple_strtoul(param->value,
1308                                         &tmpptr, 0);
1309                 if (!strcmp(param->name, DATASEQUENCEINORDER))
1310                         if (!strcmp(param->value, YES))
1311                                 DataSequenceInOrder = 1;
1312                 if (!strcmp(param->name, MAXBURSTLENGTH))
1313                         MaxBurstLength = simple_strtoul(param->value,
1314                                         &tmpptr, 0);
1315         }
1316
1317         list_for_each_entry(param, &param_list->param_list, p_list) {
1318                 if (!(param->phase & phase))
1319                         continue;
1320                 if (!SessionType && !IS_PSTATE_ACCEPTOR(param))
1321                         continue;
1322                 if (!strcmp(param->name, MAXOUTSTANDINGR2T) &&
1323                     DataSequenceInOrder && (ErrorRecoveryLevel > 0)) {
1324                         if (strcmp(param->value, "1")) {
1325                                 if (iscsi_update_param_value(param, "1") < 0)
1326                                         return -1;
1327                                 pr_debug("Reset \"%s\" to \"%s\".\n",
1328                                         param->name, param->value);
1329                         }
1330                 }
1331                 if (!strcmp(param->name, MAXCONNECTIONS) && !SessionType) {
1332                         if (strcmp(param->value, "1")) {
1333                                 if (iscsi_update_param_value(param, "1") < 0)
1334                                         return -1;
1335                                 pr_debug("Reset \"%s\" to \"%s\".\n",
1336                                         param->name, param->value);
1337                         }
1338                 }
1339                 if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1340                         FirstBurstLength = simple_strtoul(param->value,
1341                                         &tmpptr, 0);
1342                         if (FirstBurstLength > MaxBurstLength) {
1343                                 char tmpbuf[11];
1344                                 memset(tmpbuf, 0, sizeof(tmpbuf));
1345                                 sprintf(tmpbuf, "%u", MaxBurstLength);
1346                                 if (iscsi_update_param_value(param, tmpbuf))
1347                                         return -1;
1348                                 pr_debug("Reset \"%s\" to \"%s\".\n",
1349                                         param->name, param->value);
1350                         }
1351                 }
1352         }
1353
1354         return 0;
1355 }
1356
1357 int iscsi_decode_text_input(
1358         u8 phase,
1359         u8 sender,
1360         char *textbuf,
1361         u32 length,
1362         struct iscsi_conn *conn)
1363 {
1364         struct iscsi_param_list *param_list = conn->param_list;
1365         char *tmpbuf, *start = NULL, *end = NULL;
1366
1367         tmpbuf = kzalloc(length + 1, GFP_KERNEL);
1368         if (!tmpbuf) {
1369                 pr_err("Unable to allocate %u + 1 bytes for tmpbuf.\n", length);
1370                 return -ENOMEM;
1371         }
1372
1373         memcpy(tmpbuf, textbuf, length);
1374         tmpbuf[length] = '\0';
1375         start = tmpbuf;
1376         end = (start + length);
1377
1378         while (start < end) {
1379                 char *key, *value;
1380                 struct iscsi_param *param;
1381
1382                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1383                         kfree(tmpbuf);
1384                         return -1;
1385                 }
1386
1387                 pr_debug("Got key: %s=%s\n", key, value);
1388
1389                 if (phase & PHASE_SECURITY) {
1390                         if (iscsi_check_for_auth_key(key) > 0) {
1391                                 kfree(tmpbuf);
1392                                 return 1;
1393                         }
1394                 }
1395
1396                 param = iscsi_check_key(key, phase, sender, param_list);
1397                 if (!param) {
1398                         if (iscsi_add_notunderstood_response(key,
1399                                         value, param_list) < 0) {
1400                                 kfree(tmpbuf);
1401                                 return -1;
1402                         }
1403                         start += strlen(key) + strlen(value) + 2;
1404                         continue;
1405                 }
1406                 if (iscsi_check_value(param, value) < 0) {
1407                         kfree(tmpbuf);
1408                         return -1;
1409                 }
1410
1411                 start += strlen(key) + strlen(value) + 2;
1412
1413                 if (IS_PSTATE_PROPOSER(param)) {
1414                         if (iscsi_check_proposer_state(param, value) < 0) {
1415                                 kfree(tmpbuf);
1416                                 return -1;
1417                         }
1418                         SET_PSTATE_RESPONSE_GOT(param);
1419                 } else {
1420                         if (iscsi_check_acceptor_state(param, value, conn) < 0) {
1421                                 kfree(tmpbuf);
1422                                 return -1;
1423                         }
1424                         SET_PSTATE_ACCEPTOR(param);
1425                 }
1426         }
1427
1428         kfree(tmpbuf);
1429         return 0;
1430 }
1431
1432 int iscsi_encode_text_output(
1433         u8 phase,
1434         u8 sender,
1435         char *textbuf,
1436         u32 *length,
1437         struct iscsi_param_list *param_list,
1438         bool keys_workaround)
1439 {
1440         char *output_buf = NULL;
1441         struct iscsi_extra_response *er;
1442         struct iscsi_param *param;
1443
1444         output_buf = textbuf + *length;
1445
1446         if (iscsi_enforce_integrity_rules(phase, param_list) < 0)
1447                 return -1;
1448
1449         list_for_each_entry(param, &param_list->param_list, p_list) {
1450                 if (!(param->sender & sender))
1451                         continue;
1452                 if (IS_PSTATE_ACCEPTOR(param) &&
1453                     !IS_PSTATE_RESPONSE_SENT(param) &&
1454                     !IS_PSTATE_REPLY_OPTIONAL(param) &&
1455                     (param->phase & phase)) {
1456                         *length += sprintf(output_buf, "%s=%s",
1457                                 param->name, param->value);
1458                         *length += 1;
1459                         output_buf = textbuf + *length;
1460                         SET_PSTATE_RESPONSE_SENT(param);
1461                         pr_debug("Sending key: %s=%s\n",
1462                                 param->name, param->value);
1463                         continue;
1464                 }
1465                 if (IS_PSTATE_NEGOTIATE(param) &&
1466                     !IS_PSTATE_ACCEPTOR(param) &&
1467                     !IS_PSTATE_PROPOSER(param) &&
1468                     (param->phase & phase)) {
1469                         *length += sprintf(output_buf, "%s=%s",
1470                                 param->name, param->value);
1471                         *length += 1;
1472                         output_buf = textbuf + *length;
1473                         SET_PSTATE_PROPOSER(param);
1474                         iscsi_check_proposer_for_optional_reply(param,
1475                                                                 keys_workaround);
1476                         pr_debug("Sending key: %s=%s\n",
1477                                 param->name, param->value);
1478                 }
1479         }
1480
1481         list_for_each_entry(er, &param_list->extra_response_list, er_list) {
1482                 *length += sprintf(output_buf, "%s=%s", er->key, er->value);
1483                 *length += 1;
1484                 output_buf = textbuf + *length;
1485                 pr_debug("Sending key: %s=%s\n", er->key, er->value);
1486         }
1487         iscsi_release_extra_responses(param_list);
1488
1489         return 0;
1490 }
1491
1492 int iscsi_check_negotiated_keys(struct iscsi_param_list *param_list)
1493 {
1494         int ret = 0;
1495         struct iscsi_param *param;
1496
1497         list_for_each_entry(param, &param_list->param_list, p_list) {
1498                 if (IS_PSTATE_NEGOTIATE(param) &&
1499                     IS_PSTATE_PROPOSER(param) &&
1500                     !IS_PSTATE_RESPONSE_GOT(param) &&
1501                     !IS_PSTATE_REPLY_OPTIONAL(param) &&
1502                     !IS_PHASE_DECLARATIVE(param)) {
1503                         pr_err("No response for proposed key \"%s\".\n",
1504                                         param->name);
1505                         ret = -1;
1506                 }
1507         }
1508
1509         return ret;
1510 }
1511
1512 int iscsi_change_param_value(
1513         char *keyvalue,
1514         struct iscsi_param_list *param_list,
1515         int check_key)
1516 {
1517         char *key = NULL, *value = NULL;
1518         struct iscsi_param *param;
1519         int sender = 0;
1520
1521         if (iscsi_extract_key_value(keyvalue, &key, &value) < 0)
1522                 return -1;
1523
1524         if (!check_key) {
1525                 param = __iscsi_check_key(keyvalue, sender, param_list);
1526                 if (!param)
1527                         return -1;
1528         } else {
1529                 param = iscsi_check_key(keyvalue, 0, sender, param_list);
1530                 if (!param)
1531                         return -1;
1532
1533                 param->set_param = 1;
1534                 if (iscsi_check_value(param, value) < 0) {
1535                         param->set_param = 0;
1536                         return -1;
1537                 }
1538                 param->set_param = 0;
1539         }
1540
1541         if (iscsi_update_param_value(param, value) < 0)
1542                 return -1;
1543
1544         return 0;
1545 }
1546
1547 void iscsi_set_connection_parameters(
1548         struct iscsi_conn_ops *ops,
1549         struct iscsi_param_list *param_list)
1550 {
1551         char *tmpptr;
1552         struct iscsi_param *param;
1553
1554         pr_debug("---------------------------------------------------"
1555                         "---------------\n");
1556         list_for_each_entry(param, &param_list->param_list, p_list) {
1557                 /*
1558                  * Special case to set MAXXMITDATASEGMENTLENGTH from the
1559                  * target requested MaxRecvDataSegmentLength, even though
1560                  * this key is not sent over the wire.
1561                  */
1562                 if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
1563                         ops->MaxXmitDataSegmentLength =
1564                                 simple_strtoul(param->value, &tmpptr, 0);
1565                         pr_debug("MaxXmitDataSegmentLength:     %s\n",
1566                                 param->value);
1567                 }
1568
1569                 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1570                         continue;
1571                 if (!strcmp(param->name, AUTHMETHOD)) {
1572                         pr_debug("AuthMethod:                   %s\n",
1573                                 param->value);
1574                 } else if (!strcmp(param->name, HEADERDIGEST)) {
1575                         ops->HeaderDigest = !strcmp(param->value, CRC32C);
1576                         pr_debug("HeaderDigest:                 %s\n",
1577                                 param->value);
1578                 } else if (!strcmp(param->name, DATADIGEST)) {
1579                         ops->DataDigest = !strcmp(param->value, CRC32C);
1580                         pr_debug("DataDigest:                   %s\n",
1581                                 param->value);
1582                 } else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1583                         /*
1584                          * At this point iscsi_check_acceptor_state() will have
1585                          * set ops->MaxRecvDataSegmentLength from the original
1586                          * initiator provided value.
1587                          */
1588                         pr_debug("MaxRecvDataSegmentLength:     %u\n",
1589                                 ops->MaxRecvDataSegmentLength);
1590                 } else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
1591                         ops->InitiatorRecvDataSegmentLength =
1592                                 simple_strtoul(param->value, &tmpptr, 0);
1593                         pr_debug("InitiatorRecvDataSegmentLength: %s\n",
1594                                 param->value);
1595                         ops->MaxRecvDataSegmentLength =
1596                                         ops->InitiatorRecvDataSegmentLength;
1597                         pr_debug("Set MRDSL from InitiatorRecvDataSegmentLength\n");
1598                 } else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
1599                         ops->TargetRecvDataSegmentLength =
1600                                 simple_strtoul(param->value, &tmpptr, 0);
1601                         pr_debug("TargetRecvDataSegmentLength:  %s\n",
1602                                 param->value);
1603                         ops->MaxXmitDataSegmentLength =
1604                                         ops->TargetRecvDataSegmentLength;
1605                         pr_debug("Set MXDSL from TargetRecvDataSegmentLength\n");
1606                 }
1607         }
1608         pr_debug("----------------------------------------------------"
1609                         "--------------\n");
1610 }
1611
1612 void iscsi_set_session_parameters(
1613         struct iscsi_sess_ops *ops,
1614         struct iscsi_param_list *param_list,
1615         int leading)
1616 {
1617         char *tmpptr;
1618         struct iscsi_param *param;
1619
1620         pr_debug("----------------------------------------------------"
1621                         "--------------\n");
1622         list_for_each_entry(param, &param_list->param_list, p_list) {
1623                 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1624                         continue;
1625                 if (!strcmp(param->name, INITIATORNAME)) {
1626                         if (!param->value)
1627                                 continue;
1628                         if (leading)
1629                                 snprintf(ops->InitiatorName,
1630                                                 sizeof(ops->InitiatorName),
1631                                                 "%s", param->value);
1632                         pr_debug("InitiatorName:                %s\n",
1633                                 param->value);
1634                 } else if (!strcmp(param->name, INITIATORALIAS)) {
1635                         if (!param->value)
1636                                 continue;
1637                         snprintf(ops->InitiatorAlias,
1638                                                 sizeof(ops->InitiatorAlias),
1639                                                 "%s", param->value);
1640                         pr_debug("InitiatorAlias:               %s\n",
1641                                 param->value);
1642                 } else if (!strcmp(param->name, TARGETNAME)) {
1643                         if (!param->value)
1644                                 continue;
1645                         if (leading)
1646                                 snprintf(ops->TargetName,
1647                                                 sizeof(ops->TargetName),
1648                                                 "%s", param->value);
1649                         pr_debug("TargetName:                   %s\n",
1650                                 param->value);
1651                 } else if (!strcmp(param->name, TARGETALIAS)) {
1652                         if (!param->value)
1653                                 continue;
1654                         snprintf(ops->TargetAlias, sizeof(ops->TargetAlias),
1655                                         "%s", param->value);
1656                         pr_debug("TargetAlias:                  %s\n",
1657                                 param->value);
1658                 } else if (!strcmp(param->name, TARGETPORTALGROUPTAG)) {
1659                         ops->TargetPortalGroupTag =
1660                                 simple_strtoul(param->value, &tmpptr, 0);
1661                         pr_debug("TargetPortalGroupTag:         %s\n",
1662                                 param->value);
1663                 } else if (!strcmp(param->name, MAXCONNECTIONS)) {
1664                         ops->MaxConnections =
1665                                 simple_strtoul(param->value, &tmpptr, 0);
1666                         pr_debug("MaxConnections:               %s\n",
1667                                 param->value);
1668                 } else if (!strcmp(param->name, INITIALR2T)) {
1669                         ops->InitialR2T = !strcmp(param->value, YES);
1670                          pr_debug("InitialR2T:                   %s\n",
1671                                 param->value);
1672                 } else if (!strcmp(param->name, IMMEDIATEDATA)) {
1673                         ops->ImmediateData = !strcmp(param->value, YES);
1674                         pr_debug("ImmediateData:                %s\n",
1675                                 param->value);
1676                 } else if (!strcmp(param->name, MAXBURSTLENGTH)) {
1677                         ops->MaxBurstLength =
1678                                 simple_strtoul(param->value, &tmpptr, 0);
1679                         pr_debug("MaxBurstLength:               %s\n",
1680                                 param->value);
1681                 } else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1682                         ops->FirstBurstLength =
1683                                 simple_strtoul(param->value, &tmpptr, 0);
1684                         pr_debug("FirstBurstLength:             %s\n",
1685                                 param->value);
1686                 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1687                         ops->DefaultTime2Wait =
1688                                 simple_strtoul(param->value, &tmpptr, 0);
1689                         pr_debug("DefaultTime2Wait:             %s\n",
1690                                 param->value);
1691                 } else if (!strcmp(param->name, DEFAULTTIME2RETAIN)) {
1692                         ops->DefaultTime2Retain =
1693                                 simple_strtoul(param->value, &tmpptr, 0);
1694                         pr_debug("DefaultTime2Retain:           %s\n",
1695                                 param->value);
1696                 } else if (!strcmp(param->name, MAXOUTSTANDINGR2T)) {
1697                         ops->MaxOutstandingR2T =
1698                                 simple_strtoul(param->value, &tmpptr, 0);
1699                         pr_debug("MaxOutstandingR2T:            %s\n",
1700                                 param->value);
1701                 } else if (!strcmp(param->name, DATAPDUINORDER)) {
1702                         ops->DataPDUInOrder = !strcmp(param->value, YES);
1703                         pr_debug("DataPDUInOrder:               %s\n",
1704                                 param->value);
1705                 } else if (!strcmp(param->name, DATASEQUENCEINORDER)) {
1706                         ops->DataSequenceInOrder = !strcmp(param->value, YES);
1707                         pr_debug("DataSequenceInOrder:          %s\n",
1708                                 param->value);
1709                 } else if (!strcmp(param->name, ERRORRECOVERYLEVEL)) {
1710                         ops->ErrorRecoveryLevel =
1711                                 simple_strtoul(param->value, &tmpptr, 0);
1712                         pr_debug("ErrorRecoveryLevel:           %s\n",
1713                                 param->value);
1714                 } else if (!strcmp(param->name, SESSIONTYPE)) {
1715                         ops->SessionType = !strcmp(param->value, DISCOVERY);
1716                         pr_debug("SessionType:                  %s\n",
1717                                 param->value);
1718                 } else if (!strcmp(param->name, RDMAEXTENSIONS)) {
1719                         ops->RDMAExtensions = !strcmp(param->value, YES);
1720                         pr_debug("RDMAExtensions:               %s\n",
1721                                 param->value);
1722                 }
1723         }
1724         pr_debug("----------------------------------------------------"
1725                         "--------------\n");
1726
1727 }