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 {
 769         if (IS_TYPE_BOOL_AND(param)) {
 770                 if (!strcmp(param->value, NO))
 771                         SET_PSTATE_REPLY_OPTIONAL(param);
 772         } else if (IS_TYPE_BOOL_OR(param)) {
 773                 if (!strcmp(param->value, YES))
 774                         SET_PSTATE_REPLY_OPTIONAL(param);
 775                  /*
 776                   * Required for gPXE iSCSI boot client
 777                   */
 778                 if (!strcmp(param->name, IMMEDIATEDATA))
 779                         SET_PSTATE_REPLY_OPTIONAL(param);
 780         } else if (IS_TYPE_NUMBER(param)) {
 781                 if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH))
 782                         SET_PSTATE_REPLY_OPTIONAL(param);
 783                 /*
 784                  * Required for gPXE iSCSI boot client
 785                  */
 786                 if (!strcmp(param->name, MAXCONNECTIONS))
 787                         SET_PSTATE_REPLY_OPTIONAL(param);
 788         } else if (IS_PHASE_DECLARATIVE(param))
 789                 SET_PSTATE_REPLY_OPTIONAL(param);
 790 }
 791
 792 static int iscsi_check_boolean_value(struct iscsi_param *param, char *value)
 793 {
 794         if (strcmp(value, YES) && strcmp(value, NO)) {
 795                 pr_err("Illegal value for \"%s\", must be either"
 796                         " \"%s\" or \"%s\".\n", param->name, YES, NO);
 797                 return -1;
 798         }
 799
 800         return 0;
 801 }
 802
 803 static int iscsi_check_numerical_value(struct iscsi_param *param, char *value_ptr)
 804 {
 805         char *tmpptr;
 806         int value = 0;
 807
 808         value = simple_strtoul(value_ptr, &tmpptr, 0);
 809
 810         if (IS_TYPERANGE_0_TO_2(param)) {
 811                 if ((value < 0) || (value > 2)) {
 812                         pr_err("Illegal value for \"%s\", must be"
 813                                 " between 0 and 2.\n", param->name);
 814                         return -1;
 815                 }
 816                 return 0;
 817         }
 818         if (IS_TYPERANGE_0_TO_3600(param)) {
 819                 if ((value < 0) || (value > 3600)) {
 820                         pr_err("Illegal value for \"%s\", must be"
 821                                 " between 0 and 3600.\n", param->name);
 822                         return -1;
 823                 }
 824                 return 0;
 825         }
 826         if (IS_TYPERANGE_0_TO_32767(param)) {
 827                 if ((value < 0) || (value > 32767)) {
 828                         pr_err("Illegal value for \"%s\", must be"
 829                                 " between 0 and 32767.\n", param->name);
 830                         return -1;
 831                 }
 832                 return 0;
 833         }
 834         if (IS_TYPERANGE_0_TO_65535(param)) {
 835                 if ((value < 0) || (value > 65535)) {
 836                         pr_err("Illegal value for \"%s\", must be"
 837                                 " between 0 and 65535.\n", param->name);
 838                         return -1;
 839                 }
 840                 return 0;
 841         }
 842         if (IS_TYPERANGE_1_TO_65535(param)) {
 843                 if ((value < 1) || (value > 65535)) {
 844                         pr_err("Illegal value for \"%s\", must be"
 845                                 " between 1 and 65535.\n", param->name);
 846                         return -1;
 847                 }
 848                 return 0;
 849         }
 850         if (IS_TYPERANGE_2_TO_3600(param)) {
 851                 if ((value < 2) || (value > 3600)) {
 852                         pr_err("Illegal value for \"%s\", must be"
 853                                 " between 2 and 3600.\n", param->name);
 854                         return -1;
 855                 }
 856                 return 0;
 857         }
 858         if (IS_TYPERANGE_512_TO_16777215(param)) {
 859                 if ((value < 512) || (value > 16777215)) {
 860                         pr_err("Illegal value for \"%s\", must be"
 861                                 " between 512 and 16777215.\n", param->name);
 862                         return -1;
 863                 }
 864                 return 0;
 865         }
 866
 867         return 0;
 868 }
 869
 870 static int iscsi_check_string_or_list_value(struct iscsi_param *param, char *value)
 871 {
 872         if (IS_PSTATE_PROPOSER(param))
 873                 return 0;
 874
 875         if (IS_TYPERANGE_AUTH_PARAM(param)) {
 876                 if (strcmp(value, KRB5) && strcmp(value, SPKM1) &&
 877                     strcmp(value, SPKM2) && strcmp(value, SRP) &&
 878                     strcmp(value, CHAP) && strcmp(value, NONE)) {
 879                         pr_err("Illegal value for \"%s\", must be"
 880                                 " \"%s\", \"%s\", \"%s\", \"%s\", \"%s\""
 881                                 " or \"%s\".\n", param->name, KRB5,
 882                                         SPKM1, SPKM2, SRP, CHAP, NONE);
 883                         return -1;
 884                 }
 885         }
 886         if (IS_TYPERANGE_DIGEST_PARAM(param)) {
 887                 if (strcmp(value, CRC32C) && strcmp(value, NONE)) {
 888                         pr_err("Illegal value for \"%s\", must be"
 889                                 " \"%s\" or \"%s\".\n", param->name,
 890                                         CRC32C, NONE);
 891                         return -1;
 892                 }
 893         }
 894         if (IS_TYPERANGE_SESSIONTYPE(param)) {
 895                 if (strcmp(value, DISCOVERY) && strcmp(value, NORMAL)) {
 896                         pr_err("Illegal value for \"%s\", must be"
 897                                 " \"%s\" or \"%s\".\n", param->name,
 898                                         DISCOVERY, NORMAL);
 899                         return -1;
 900                 }
 901         }
 902
 903         return 0;
 904 }
 905
 906 static char *iscsi_check_valuelist_for_support(
 907         struct iscsi_param *param,
 908         char *value)
 909 {
 910         char *tmp1 = NULL, *tmp2 = NULL;
 911         char *acceptor_values = NULL, *proposer_values = NULL;
 912
 913         acceptor_values = param->value;
 914         proposer_values = value;
 915
 916         do {
 917                 if (!proposer_values)
 918                         return NULL;
 919                 tmp1 = strchr(proposer_values, ',');
 920                 if (tmp1)
 921                         *tmp1 = '\0';
 922                 acceptor_values = param->value;
 923                 do {
 924                         if (!acceptor_values) {
 925                                 if (tmp1)
 926                                         *tmp1 = ',';
 927                                 return NULL;
 928                         }
 929                         tmp2 = strchr(acceptor_values, ',');
 930                         if (tmp2)
 931                                 *tmp2 = '\0';
 932                         if (!strcmp(acceptor_values, proposer_values)) {
 933                                 if (tmp2)
 934                                         *tmp2 = ',';
 935                                 goto out;
 936                         }
 937                         if (tmp2)
 938                                 *tmp2++ = ',';
 939
 940                         acceptor_values = tmp2;
 941                 } while (acceptor_values);
 942                 if (tmp1)
 943                         *tmp1++ = ',';
 944                 proposer_values = tmp1;
 945         } while (proposer_values);
 946
 947 out:
 948         return proposer_values;
 949 }
 950
 951 static int iscsi_check_acceptor_state(struct iscsi_param *param, char *value,
 952                                 struct iscsi_conn *conn)
 953 {
 954         u8 acceptor_boolean_value = 0, proposer_boolean_value = 0;
 955         char *negotiated_value = NULL;
 956
 957         if (IS_PSTATE_ACCEPTOR(param)) {
 958                 pr_err("Received key \"%s\" twice, protocol error.\n",
 959                                 param->name);
 960                 return -1;
 961         }
 962
 963         if (IS_PSTATE_REJECT(param))
 964                 return 0;
 965
 966         if (IS_TYPE_BOOL_AND(param)) {
 967                 if (!strcmp(value, YES))
 968                         proposer_boolean_value = 1;
 969                 if (!strcmp(param->value, YES))
 970                         acceptor_boolean_value = 1;
 971                 if (acceptor_boolean_value && proposer_boolean_value)
 972                         do {} while (0);
 973                 else {
 974                         if (iscsi_update_param_value(param, NO) < 0)
 975                                 return -1;
 976                         if (!proposer_boolean_value)
 977                                 SET_PSTATE_REPLY_OPTIONAL(param);
 978                 }
 979         } else if (IS_TYPE_BOOL_OR(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                         if (iscsi_update_param_value(param, YES) < 0)
 986                                 return -1;
 987                         if (proposer_boolean_value)
 988                                 SET_PSTATE_REPLY_OPTIONAL(param);
 989                 }
 990         } else if (IS_TYPE_NUMBER(param)) {
 991                 char *tmpptr, buf[11];
 992                 u32 acceptor_value = simple_strtoul(param->value, &tmpptr, 0);
 993                 u32 proposer_value = simple_strtoul(value, &tmpptr, 0);
 994
 995                 memset(buf, 0, sizeof(buf));
 996
 997                 if (!strcmp(param->name, MAXCONNECTIONS) ||
 998                     !strcmp(param->name, MAXBURSTLENGTH) ||
 999                     !strcmp(param->name, FIRSTBURSTLENGTH) ||
1000                     !strcmp(param->name, MAXOUTSTANDINGR2T) ||
1001                     !strcmp(param->name, DEFAULTTIME2RETAIN) ||
1002                     !strcmp(param->name, ERRORRECOVERYLEVEL)) {
1003                         if (proposer_value > acceptor_value) {
1004                                 sprintf(buf, "%u", acceptor_value);
1005                                 if (iscsi_update_param_value(param,
1006                                                 &buf[0]) < 0)
1007                                         return -1;
1008                         } else {
1009                                 if (iscsi_update_param_value(param, value) < 0)
1010                                         return -1;
1011                         }
1012                 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1013                         if (acceptor_value > proposer_value) {
1014                                 sprintf(buf, "%u", acceptor_value);
1015                                 if (iscsi_update_param_value(param,
1016                                                 &buf[0]) < 0)
1017                                         return -1;
1018                         } else {
1019                                 if (iscsi_update_param_value(param, value) < 0)
1020                                         return -1;
1021                         }
1022                 } else {
1023                         if (iscsi_update_param_value(param, value) < 0)
1024                                 return -1;
1025                 }
1026
1027                 if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1028                         struct iscsi_param *param_mxdsl;
1029                         unsigned long long tmp;
1030                         int rc;
1031
1032                         rc = kstrtoull(param->value, 0, &tmp);
1033                         if (rc < 0)
1034                                 return -1;
1035
1036                         conn->conn_ops->MaxRecvDataSegmentLength = tmp;
1037                         pr_debug("Saving op->MaxRecvDataSegmentLength from"
1038                                 " original initiator received value: %u\n",
1039                                 conn->conn_ops->MaxRecvDataSegmentLength);
1040
1041                         param_mxdsl = iscsi_find_param_from_key(
1042                                                 MAXXMITDATASEGMENTLENGTH,
1043                                                 conn->param_list);
1044                         if (!param_mxdsl)
1045                                 return -1;
1046
1047                         rc = iscsi_update_param_value(param,
1048                                                 param_mxdsl->value);
1049                         if (rc < 0)
1050                                 return -1;
1051
1052                         pr_debug("Updated %s to target MXDSL value: %s\n",
1053                                         param->name, param->value);
1054                 }
1055         } else if (IS_TYPE_VALUE_LIST(param)) {
1056                 negotiated_value = iscsi_check_valuelist_for_support(
1057                                         param, value);
1058                 if (!negotiated_value) {
1059                         pr_err("Proposer's value list \"%s\" contains"
1060                                 " no valid values from Acceptor's value list"
1061                                 " \"%s\".\n", value, param->value);
1062                         return -1;
1063                 }
1064                 if (iscsi_update_param_value(param, negotiated_value) < 0)
1065                         return -1;
1066         } else if (IS_PHASE_DECLARATIVE(param)) {
1067                 if (iscsi_update_param_value(param, value) < 0)
1068                         return -1;
1069                 SET_PSTATE_REPLY_OPTIONAL(param);
1070         }
1071
1072         return 0;
1073 }
1074
1075 static int iscsi_check_proposer_state(struct iscsi_param *param, char *value)
1076 {
1077         if (IS_PSTATE_RESPONSE_GOT(param)) {
1078                 pr_err("Received key \"%s\" twice, protocol error.\n",
1079                                 param->name);
1080                 return -1;
1081         }
1082
1083         if (IS_TYPE_VALUE_LIST(param)) {
1084                 char *comma_ptr = NULL, *tmp_ptr = NULL;
1085
1086                 comma_ptr = strchr(value, ',');
1087                 if (comma_ptr) {
1088                         pr_err("Illegal \",\" in response for \"%s\".\n",
1089                                         param->name);
1090                         return -1;
1091                 }
1092
1093                 tmp_ptr = iscsi_check_valuelist_for_support(param, value);
1094                 if (!tmp_ptr)
1095                         return -1;
1096         }
1097
1098         if (iscsi_update_param_value(param, value) < 0)
1099                 return -1;
1100
1101         return 0;
1102 }
1103
1104 static int iscsi_check_value(struct iscsi_param *param, char *value)
1105 {
1106         char *comma_ptr = NULL;
1107
1108         if (!strcmp(value, REJECT)) {
1109                 if (!strcmp(param->name, IFMARKINT) ||
1110                     !strcmp(param->name, OFMARKINT)) {
1111                         /*
1112                          * Reject is not fatal for [I,O]FMarkInt,  and causes
1113                          * [I,O]FMarker to be reset to No. (See iSCSI v20 A.3.2)
1114                          */
1115                         SET_PSTATE_REJECT(param);
1116                         return 0;
1117                 }
1118                 pr_err("Received %s=%s\n", param->name, value);
1119                 return -1;
1120         }
1121         if (!strcmp(value, IRRELEVANT)) {
1122                 pr_debug("Received %s=%s\n", param->name, value);
1123                 SET_PSTATE_IRRELEVANT(param);
1124                 return 0;
1125         }
1126         if (!strcmp(value, NOTUNDERSTOOD)) {
1127                 if (!IS_PSTATE_PROPOSER(param)) {
1128                         pr_err("Received illegal offer %s=%s\n",
1129                                 param->name, value);
1130                         return -1;
1131                 }
1132
1133 /* #warning FIXME: Add check for X-ExtensionKey here */
1134                 pr_err("Standard iSCSI key \"%s\" cannot be answered"
1135                         " with \"%s\", protocol error.\n", param->name, value);
1136                 return -1;
1137         }
1138
1139         do {
1140                 comma_ptr = NULL;
1141                 comma_ptr = strchr(value, ',');
1142
1143                 if (comma_ptr && !IS_TYPE_VALUE_LIST(param)) {
1144                         pr_err("Detected value separator \",\", but"
1145                                 " key \"%s\" does not allow a value list,"
1146                                 " protocol error.\n", param->name);
1147                         return -1;
1148                 }
1149                 if (comma_ptr)
1150                         *comma_ptr = '\0';
1151
1152                 if (strlen(value) > VALUE_MAXLEN) {
1153                         pr_err("Value for key \"%s\" exceeds %d,"
1154                                 " protocol error.\n", param->name,
1155                                 VALUE_MAXLEN);
1156                         return -1;
1157                 }
1158
1159                 if (IS_TYPE_BOOL_AND(param) || IS_TYPE_BOOL_OR(param)) {
1160                         if (iscsi_check_boolean_value(param, value) < 0)
1161                                 return -1;
1162                 } else if (IS_TYPE_NUMBER(param)) {
1163                         if (iscsi_check_numerical_value(param, value) < 0)
1164                                 return -1;
1165                 } else if (IS_TYPE_STRING(param) || IS_TYPE_VALUE_LIST(param)) {
1166                         if (iscsi_check_string_or_list_value(param, value) < 0)
1167                                 return -1;
1168                 } else {
1169                         pr_err("Huh? 0x%02x\n", param->type);
1170                         return -1;
1171                 }
1172
1173                 if (comma_ptr)
1174                         *comma_ptr++ = ',';
1175
1176                 value = comma_ptr;
1177         } while (value);
1178
1179         return 0;
1180 }
1181
1182 static struct iscsi_param *__iscsi_check_key(
1183         char *key,
1184         int sender,
1185         struct iscsi_param_list *param_list)
1186 {
1187         struct iscsi_param *param;
1188
1189         if (strlen(key) > KEY_MAXLEN) {
1190                 pr_err("Length of key name \"%s\" exceeds %d.\n",
1191                         key, KEY_MAXLEN);
1192                 return NULL;
1193         }
1194
1195         param = iscsi_find_param_from_key(key, param_list);
1196         if (!param)
1197                 return NULL;
1198
1199         if ((sender & SENDER_INITIATOR) && !IS_SENDER_INITIATOR(param)) {
1200                 pr_err("Key \"%s\" may not be sent to %s,"
1201                         " protocol error.\n", param->name,
1202                         (sender & SENDER_RECEIVER) ? "target" : "initiator");
1203                 return NULL;
1204         }
1205
1206         if ((sender & SENDER_TARGET) && !IS_SENDER_TARGET(param)) {
1207                 pr_err("Key \"%s\" may not be sent to %s,"
1208                         " protocol error.\n", param->name,
1209                         (sender & SENDER_RECEIVER) ? "initiator" : "target");
1210                 return NULL;
1211         }
1212
1213         return param;
1214 }
1215
1216 static struct iscsi_param *iscsi_check_key(
1217         char *key,
1218         int phase,
1219         int sender,
1220         struct iscsi_param_list *param_list)
1221 {
1222         struct iscsi_param *param;
1223         /*
1224          * Key name length must not exceed 63 bytes. (See iSCSI v20 5.1)
1225          */
1226         if (strlen(key) > KEY_MAXLEN) {
1227                 pr_err("Length of key name \"%s\" exceeds %d.\n",
1228                         key, KEY_MAXLEN);
1229                 return NULL;
1230         }
1231
1232         param = iscsi_find_param_from_key(key, param_list);
1233         if (!param)
1234                 return NULL;
1235
1236         if ((sender & SENDER_INITIATOR) && !IS_SENDER_INITIATOR(param)) {
1237                 pr_err("Key \"%s\" may not be sent to %s,"
1238                         " protocol error.\n", param->name,
1239                         (sender & SENDER_RECEIVER) ? "target" : "initiator");
1240                 return NULL;
1241         }
1242         if ((sender & SENDER_TARGET) && !IS_SENDER_TARGET(param)) {
1243                 pr_err("Key \"%s\" may not be sent to %s,"
1244                                 " protocol error.\n", param->name,
1245                         (sender & SENDER_RECEIVER) ? "initiator" : "target");
1246                 return NULL;
1247         }
1248
1249         if (IS_PSTATE_ACCEPTOR(param)) {
1250                 pr_err("Key \"%s\" received twice, protocol error.\n",
1251                                 key);
1252                 return NULL;
1253         }
1254
1255         if (!phase)
1256                 return param;
1257
1258         if (!(param->phase & phase)) {
1259                 pr_err("Key \"%s\" may not be negotiated during ",
1260                                 param->name);
1261                 switch (phase) {
1262                 case PHASE_SECURITY:
1263                         pr_debug("Security phase.\n");
1264                         break;
1265                 case PHASE_OPERATIONAL:
1266                         pr_debug("Operational phase.\n");
1267                         break;
1268                 default:
1269                         pr_debug("Unknown phase.\n");
1270                 }
1271                 return NULL;
1272         }
1273
1274         return param;
1275 }
1276
1277 static int iscsi_enforce_integrity_rules(
1278         u8 phase,
1279         struct iscsi_param_list *param_list)
1280 {
1281         char *tmpptr;
1282         u8 DataSequenceInOrder = 0;
1283         u8 ErrorRecoveryLevel = 0, SessionType = 0;
1284         u32 FirstBurstLength = 0, MaxBurstLength = 0;
1285         struct iscsi_param *param = NULL;
1286
1287         list_for_each_entry(param, &param_list->param_list, p_list) {
1288                 if (!(param->phase & phase))
1289                         continue;
1290                 if (!strcmp(param->name, SESSIONTYPE))
1291                         if (!strcmp(param->value, NORMAL))
1292                                 SessionType = 1;
1293                 if (!strcmp(param->name, ERRORRECOVERYLEVEL))
1294                         ErrorRecoveryLevel = simple_strtoul(param->value,
1295                                         &tmpptr, 0);
1296                 if (!strcmp(param->name, DATASEQUENCEINORDER))
1297                         if (!strcmp(param->value, YES))
1298                                 DataSequenceInOrder = 1;
1299                 if (!strcmp(param->name, MAXBURSTLENGTH))
1300                         MaxBurstLength = simple_strtoul(param->value,
1301                                         &tmpptr, 0);
1302         }
1303
1304         list_for_each_entry(param, &param_list->param_list, p_list) {
1305                 if (!(param->phase & phase))
1306                         continue;
1307                 if (!SessionType && !IS_PSTATE_ACCEPTOR(param))
1308                         continue;
1309                 if (!strcmp(param->name, MAXOUTSTANDINGR2T) &&
1310                     DataSequenceInOrder && (ErrorRecoveryLevel > 0)) {
1311                         if (strcmp(param->value, "1")) {
1312                                 if (iscsi_update_param_value(param, "1") < 0)
1313                                         return -1;
1314                                 pr_debug("Reset \"%s\" to \"%s\".\n",
1315                                         param->name, param->value);
1316                         }
1317                 }
1318                 if (!strcmp(param->name, MAXCONNECTIONS) && !SessionType) {
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, FIRSTBURSTLENGTH)) {
1327                         FirstBurstLength = simple_strtoul(param->value,
1328                                         &tmpptr, 0);
1329                         if (FirstBurstLength > MaxBurstLength) {
1330                                 char tmpbuf[11];
1331                                 memset(tmpbuf, 0, sizeof(tmpbuf));
1332                                 sprintf(tmpbuf, "%u", MaxBurstLength);
1333                                 if (iscsi_update_param_value(param, tmpbuf))
1334                                         return -1;
1335                                 pr_debug("Reset \"%s\" to \"%s\".\n",
1336                                         param->name, param->value);
1337                         }
1338                 }
1339         }
1340
1341         return 0;
1342 }
1343
1344 int iscsi_decode_text_input(
1345         u8 phase,
1346         u8 sender,
1347         char *textbuf,
1348         u32 length,
1349         struct iscsi_conn *conn)
1350 {
1351         struct iscsi_param_list *param_list = conn->param_list;
1352         char *tmpbuf, *start = NULL, *end = NULL;
1353
1354         tmpbuf = kzalloc(length + 1, GFP_KERNEL);
1355         if (!tmpbuf) {
1356                 pr_err("Unable to allocate %u + 1 bytes for tmpbuf.\n", length);
1357                 return -ENOMEM;
1358         }
1359
1360         memcpy(tmpbuf, textbuf, length);
1361         tmpbuf[length] = '\0';
1362         start = tmpbuf;
1363         end = (start + length);
1364
1365         while (start < end) {
1366                 char *key, *value;
1367                 struct iscsi_param *param;
1368
1369                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1370                         kfree(tmpbuf);
1371                         return -1;
1372                 }
1373
1374                 pr_debug("Got key: %s=%s\n", key, value);
1375
1376                 if (phase & PHASE_SECURITY) {
1377                         if (iscsi_check_for_auth_key(key) > 0) {
1378                                 kfree(tmpbuf);
1379                                 return 1;
1380                         }
1381                 }
1382
1383                 param = iscsi_check_key(key, phase, sender, param_list);
1384                 if (!param) {
1385                         if (iscsi_add_notunderstood_response(key,
1386                                         value, param_list) < 0) {
1387                                 kfree(tmpbuf);
1388                                 return -1;
1389                         }
1390                         start += strlen(key) + strlen(value) + 2;
1391                         continue;
1392                 }
1393                 if (iscsi_check_value(param, value) < 0) {
1394                         kfree(tmpbuf);
1395                         return -1;
1396                 }
1397
1398                 start += strlen(key) + strlen(value) + 2;
1399
1400                 if (IS_PSTATE_PROPOSER(param)) {
1401                         if (iscsi_check_proposer_state(param, value) < 0) {
1402                                 kfree(tmpbuf);
1403                                 return -1;
1404                         }
1405                         SET_PSTATE_RESPONSE_GOT(param);
1406                 } else {
1407                         if (iscsi_check_acceptor_state(param, value, conn) < 0) {
1408                                 kfree(tmpbuf);
1409                                 return -1;
1410                         }
1411                         SET_PSTATE_ACCEPTOR(param);
1412                 }
1413         }
1414
1415         kfree(tmpbuf);
1416         return 0;
1417 }
1418
1419 int iscsi_encode_text_output(
1420         u8 phase,
1421         u8 sender,
1422         char *textbuf,
1423         u32 *length,
1424         struct iscsi_param_list *param_list)
1425 {
1426         char *output_buf = NULL;
1427         struct iscsi_extra_response *er;
1428         struct iscsi_param *param;
1429
1430         output_buf = textbuf + *length;
1431
1432         if (iscsi_enforce_integrity_rules(phase, param_list) < 0)
1433                 return -1;
1434
1435         list_for_each_entry(param, &param_list->param_list, p_list) {
1436                 if (!(param->sender & sender))
1437                         continue;
1438                 if (IS_PSTATE_ACCEPTOR(param) &&
1439                     !IS_PSTATE_RESPONSE_SENT(param) &&
1440                     !IS_PSTATE_REPLY_OPTIONAL(param) &&
1441                     (param->phase & phase)) {
1442                         *length += sprintf(output_buf, "%s=%s",
1443                                 param->name, param->value);
1444                         *length += 1;
1445                         output_buf = textbuf + *length;
1446                         SET_PSTATE_RESPONSE_SENT(param);
1447                         pr_debug("Sending key: %s=%s\n",
1448                                 param->name, param->value);
1449                         continue;
1450                 }
1451                 if (IS_PSTATE_NEGOTIATE(param) &&
1452                     !IS_PSTATE_ACCEPTOR(param) &&
1453                     !IS_PSTATE_PROPOSER(param) &&
1454                     (param->phase & phase)) {
1455                         *length += sprintf(output_buf, "%s=%s",
1456                                 param->name, param->value);
1457                         *length += 1;
1458                         output_buf = textbuf + *length;
1459                         SET_PSTATE_PROPOSER(param);
1460                         iscsi_check_proposer_for_optional_reply(param);
1461                         pr_debug("Sending key: %s=%s\n",
1462                                 param->name, param->value);
1463                 }
1464         }
1465
1466         list_for_each_entry(er, &param_list->extra_response_list, er_list) {
1467                 *length += sprintf(output_buf, "%s=%s", er->key, er->value);
1468                 *length += 1;
1469                 output_buf = textbuf + *length;
1470                 pr_debug("Sending key: %s=%s\n", er->key, er->value);
1471         }
1472         iscsi_release_extra_responses(param_list);
1473
1474         return 0;
1475 }
1476
1477 int iscsi_check_negotiated_keys(struct iscsi_param_list *param_list)
1478 {
1479         int ret = 0;
1480         struct iscsi_param *param;
1481
1482         list_for_each_entry(param, &param_list->param_list, p_list) {
1483                 if (IS_PSTATE_NEGOTIATE(param) &&
1484                     IS_PSTATE_PROPOSER(param) &&
1485                     !IS_PSTATE_RESPONSE_GOT(param) &&
1486                     !IS_PSTATE_REPLY_OPTIONAL(param) &&
1487                     !IS_PHASE_DECLARATIVE(param)) {
1488                         pr_err("No response for proposed key \"%s\".\n",
1489                                         param->name);
1490                         ret = -1;
1491                 }
1492         }
1493
1494         return ret;
1495 }
1496
1497 int iscsi_change_param_value(
1498         char *keyvalue,
1499         struct iscsi_param_list *param_list,
1500         int check_key)
1501 {
1502         char *key = NULL, *value = NULL;
1503         struct iscsi_param *param;
1504         int sender = 0;
1505
1506         if (iscsi_extract_key_value(keyvalue, &key, &value) < 0)
1507                 return -1;
1508
1509         if (!check_key) {
1510                 param = __iscsi_check_key(keyvalue, sender, param_list);
1511                 if (!param)
1512                         return -1;
1513         } else {
1514                 param = iscsi_check_key(keyvalue, 0, sender, param_list);
1515                 if (!param)
1516                         return -1;
1517
1518                 param->set_param = 1;
1519                 if (iscsi_check_value(param, value) < 0) {
1520                         param->set_param = 0;
1521                         return -1;
1522                 }
1523                 param->set_param = 0;
1524         }
1525
1526         if (iscsi_update_param_value(param, value) < 0)
1527                 return -1;
1528
1529         return 0;
1530 }
1531
1532 void iscsi_set_connection_parameters(
1533         struct iscsi_conn_ops *ops,
1534         struct iscsi_param_list *param_list)
1535 {
1536         char *tmpptr;
1537         struct iscsi_param *param;
1538
1539         pr_debug("---------------------------------------------------"
1540                         "---------------\n");
1541         list_for_each_entry(param, &param_list->param_list, p_list) {
1542                 /*
1543                  * Special case to set MAXXMITDATASEGMENTLENGTH from the
1544                  * target requested MaxRecvDataSegmentLength, even though
1545                  * this key is not sent over the wire.
1546                  */
1547                 if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
1548                         ops->MaxXmitDataSegmentLength =
1549                                 simple_strtoul(param->value, &tmpptr, 0);
1550                         pr_debug("MaxXmitDataSegmentLength:     %s\n",
1551                                 param->value);
1552                 }
1553
1554                 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1555                         continue;
1556                 if (!strcmp(param->name, AUTHMETHOD)) {
1557                         pr_debug("AuthMethod:                   %s\n",
1558                                 param->value);
1559                 } else if (!strcmp(param->name, HEADERDIGEST)) {
1560                         ops->HeaderDigest = !strcmp(param->value, CRC32C);
1561                         pr_debug("HeaderDigest:                 %s\n",
1562                                 param->value);
1563                 } else if (!strcmp(param->name, DATADIGEST)) {
1564                         ops->DataDigest = !strcmp(param->value, CRC32C);
1565                         pr_debug("DataDigest:                   %s\n",
1566                                 param->value);
1567                 } else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1568                         /*
1569                          * At this point iscsi_check_acceptor_state() will have
1570                          * set ops->MaxRecvDataSegmentLength from the original
1571                          * initiator provided value.
1572                          */
1573                         pr_debug("MaxRecvDataSegmentLength:     %u\n",
1574                                 ops->MaxRecvDataSegmentLength);
1575                 } else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
1576                         ops->InitiatorRecvDataSegmentLength =
1577                                 simple_strtoul(param->value, &tmpptr, 0);
1578                         pr_debug("InitiatorRecvDataSegmentLength: %s\n",
1579                                 param->value);
1580                         ops->MaxRecvDataSegmentLength =
1581                                         ops->InitiatorRecvDataSegmentLength;
1582                         pr_debug("Set MRDSL from InitiatorRecvDataSegmentLength\n");
1583                 } else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
1584                         ops->TargetRecvDataSegmentLength =
1585                                 simple_strtoul(param->value, &tmpptr, 0);
1586                         pr_debug("TargetRecvDataSegmentLength:  %s\n",
1587                                 param->value);
1588                         ops->MaxXmitDataSegmentLength =
1589                                         ops->TargetRecvDataSegmentLength;
1590                         pr_debug("Set MXDSL from TargetRecvDataSegmentLength\n");
1591                 }
1592         }
1593         pr_debug("----------------------------------------------------"
1594                         "--------------\n");
1595 }
1596
1597 void iscsi_set_session_parameters(
1598         struct iscsi_sess_ops *ops,
1599         struct iscsi_param_list *param_list,
1600         int leading)
1601 {
1602         char *tmpptr;
1603         struct iscsi_param *param;
1604
1605         pr_debug("----------------------------------------------------"
1606                         "--------------\n");
1607         list_for_each_entry(param, &param_list->param_list, p_list) {
1608                 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1609                         continue;
1610                 if (!strcmp(param->name, INITIATORNAME)) {
1611                         if (!param->value)
1612                                 continue;
1613                         if (leading)
1614                                 snprintf(ops->InitiatorName,
1615                                                 sizeof(ops->InitiatorName),
1616                                                 "%s", param->value);
1617                         pr_debug("InitiatorName:                %s\n",
1618                                 param->value);
1619                 } else if (!strcmp(param->name, INITIATORALIAS)) {
1620                         if (!param->value)
1621                                 continue;
1622                         snprintf(ops->InitiatorAlias,
1623                                                 sizeof(ops->InitiatorAlias),
1624                                                 "%s", param->value);
1625                         pr_debug("InitiatorAlias:               %s\n",
1626                                 param->value);
1627                 } else if (!strcmp(param->name, TARGETNAME)) {
1628                         if (!param->value)
1629                                 continue;
1630                         if (leading)
1631                                 snprintf(ops->TargetName,
1632                                                 sizeof(ops->TargetName),
1633                                                 "%s", param->value);
1634                         pr_debug("TargetName:                   %s\n",
1635                                 param->value);
1636                 } else if (!strcmp(param->name, TARGETALIAS)) {
1637                         if (!param->value)
1638                                 continue;
1639                         snprintf(ops->TargetAlias, sizeof(ops->TargetAlias),
1640                                         "%s", param->value);
1641                         pr_debug("TargetAlias:                  %s\n",
1642                                 param->value);
1643                 } else if (!strcmp(param->name, TARGETPORTALGROUPTAG)) {
1644                         ops->TargetPortalGroupTag =
1645                                 simple_strtoul(param->value, &tmpptr, 0);
1646                         pr_debug("TargetPortalGroupTag:         %s\n",
1647                                 param->value);
1648                 } else if (!strcmp(param->name, MAXCONNECTIONS)) {
1649                         ops->MaxConnections =
1650                                 simple_strtoul(param->value, &tmpptr, 0);
1651                         pr_debug("MaxConnections:               %s\n",
1652                                 param->value);
1653                 } else if (!strcmp(param->name, INITIALR2T)) {
1654                         ops->InitialR2T = !strcmp(param->value, YES);
1655                          pr_debug("InitialR2T:                   %s\n",
1656                                 param->value);
1657                 } else if (!strcmp(param->name, IMMEDIATEDATA)) {
1658                         ops->ImmediateData = !strcmp(param->value, YES);
1659                         pr_debug("ImmediateData:                %s\n",
1660                                 param->value);
1661                 } else if (!strcmp(param->name, MAXBURSTLENGTH)) {
1662                         ops->MaxBurstLength =
1663                                 simple_strtoul(param->value, &tmpptr, 0);
1664                         pr_debug("MaxBurstLength:               %s\n",
1665                                 param->value);
1666                 } else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1667                         ops->FirstBurstLength =
1668                                 simple_strtoul(param->value, &tmpptr, 0);
1669                         pr_debug("FirstBurstLength:             %s\n",
1670                                 param->value);
1671                 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1672                         ops->DefaultTime2Wait =
1673                                 simple_strtoul(param->value, &tmpptr, 0);
1674                         pr_debug("DefaultTime2Wait:             %s\n",
1675                                 param->value);
1676                 } else if (!strcmp(param->name, DEFAULTTIME2RETAIN)) {
1677                         ops->DefaultTime2Retain =
1678                                 simple_strtoul(param->value, &tmpptr, 0);
1679                         pr_debug("DefaultTime2Retain:           %s\n",
1680                                 param->value);
1681                 } else if (!strcmp(param->name, MAXOUTSTANDINGR2T)) {
1682                         ops->MaxOutstandingR2T =
1683                                 simple_strtoul(param->value, &tmpptr, 0);
1684                         pr_debug("MaxOutstandingR2T:            %s\n",
1685                                 param->value);
1686                 } else if (!strcmp(param->name, DATAPDUINORDER)) {
1687                         ops->DataPDUInOrder = !strcmp(param->value, YES);
1688                         pr_debug("DataPDUInOrder:               %s\n",
1689                                 param->value);
1690                 } else if (!strcmp(param->name, DATASEQUENCEINORDER)) {
1691                         ops->DataSequenceInOrder = !strcmp(param->value, YES);
1692                         pr_debug("DataSequenceInOrder:          %s\n",
1693                                 param->value);
1694                 } else if (!strcmp(param->name, ERRORRECOVERYLEVEL)) {
1695                         ops->ErrorRecoveryLevel =
1696                                 simple_strtoul(param->value, &tmpptr, 0);
1697                         pr_debug("ErrorRecoveryLevel:           %s\n",
1698                                 param->value);
1699                 } else if (!strcmp(param->name, SESSIONTYPE)) {
1700                         ops->SessionType = !strcmp(param->value, DISCOVERY);
1701                         pr_debug("SessionType:                  %s\n",
1702                                 param->value);
1703                 } else if (!strcmp(param->name, RDMAEXTENSIONS)) {
1704                         ops->RDMAExtensions = !strcmp(param->value, YES);
1705                         pr_debug("RDMAExtensions:               %s\n",
1706                                 param->value);
1707                 }
1708         }
1709         pr_debug("----------------------------------------------------"
1710                         "--------------\n");
1711
1712 }