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 #include <linux/uio.h> /* struct kvec */
  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 EXPORT_SYMBOL(iscsi_find_param_from_key);
 684
 685 int iscsi_extract_key_value(char *textbuf, char **key, char **value)
 686 {
 687         *value = strchr(textbuf, '=');
 688         if (!*value) {
 689                 pr_err("Unable to locate \"=\" separator for key,"
 690                                 " ignoring request.\n");
 691                 return -1;
 692         }
 693
 694         *key = textbuf;
 695         **value = '\0';
 696         *value = *value + 1;
 697
 698         return 0;
 699 }
 700
 701 int iscsi_update_param_value(struct iscsi_param *param, char *value)
 702 {
 703         kfree(param->value);
 704
 705         param->value = kstrdup(value, GFP_KERNEL);
 706         if (!param->value) {
 707                 pr_err("Unable to allocate memory for value.\n");
 708                 return -ENOMEM;
 709         }
 710
 711         pr_debug("iSCSI Parameter updated to %s=%s\n",
 712                         param->name, param->value);
 713         return 0;
 714 }
 715
 716 static int iscsi_add_notunderstood_response(
 717         char *key,
 718         char *value,
 719         struct iscsi_param_list *param_list)
 720 {
 721         struct iscsi_extra_response *extra_response;
 722
 723         if (strlen(value) > VALUE_MAXLEN) {
 724                 pr_err("Value for notunderstood key \"%s\" exceeds %d,"
 725                         " protocol error.\n", key, VALUE_MAXLEN);
 726                 return -1;
 727         }
 728
 729         extra_response = kzalloc(sizeof(struct iscsi_extra_response), GFP_KERNEL);
 730         if (!extra_response) {
 731                 pr_err("Unable to allocate memory for"
 732                         " struct iscsi_extra_response.\n");
 733                 return -ENOMEM;
 734         }
 735         INIT_LIST_HEAD(&extra_response->er_list);
 736
 737         strlcpy(extra_response->key, key, sizeof(extra_response->key));
 738         strlcpy(extra_response->value, NOTUNDERSTOOD,
 739                 sizeof(extra_response->value));
 740
 741         list_add_tail(&extra_response->er_list,
 742                         &param_list->extra_response_list);
 743         return 0;
 744 }
 745
 746 static int iscsi_check_for_auth_key(char *key)
 747 {
 748         /*
 749          * RFC 1994
 750          */
 751         if (!strcmp(key, "CHAP_A") || !strcmp(key, "CHAP_I") ||
 752             !strcmp(key, "CHAP_C") || !strcmp(key, "CHAP_N") ||
 753             !strcmp(key, "CHAP_R"))
 754                 return 1;
 755
 756         /*
 757          * RFC 2945
 758          */
 759         if (!strcmp(key, "SRP_U") || !strcmp(key, "SRP_N") ||
 760             !strcmp(key, "SRP_g") || !strcmp(key, "SRP_s") ||
 761             !strcmp(key, "SRP_A") || !strcmp(key, "SRP_B") ||
 762             !strcmp(key, "SRP_M") || !strcmp(key, "SRP_HM"))
 763                 return 1;
 764
 765         return 0;
 766 }
 767
 768 static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param,
 769                                                     bool keys_workaround)
 770 {
 771         if (IS_TYPE_BOOL_AND(param)) {
 772                 if (!strcmp(param->value, NO))
 773                         SET_PSTATE_REPLY_OPTIONAL(param);
 774         } else if (IS_TYPE_BOOL_OR(param)) {
 775                 if (!strcmp(param->value, YES))
 776                         SET_PSTATE_REPLY_OPTIONAL(param);
 777
 778                 if (keys_workaround) {
 779                         /*
 780                          * Required for gPXE iSCSI boot client
 781                          */
 782                         if (!strcmp(param->name, IMMEDIATEDATA))
 783                                 SET_PSTATE_REPLY_OPTIONAL(param);
 784                 }
 785         } else if (IS_TYPE_NUMBER(param)) {
 786                 if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH))
 787                         SET_PSTATE_REPLY_OPTIONAL(param);
 788
 789                 if (keys_workaround) {
 790                         /*
 791                          * Required for Mellanox Flexboot PXE boot ROM
 792                          */
 793                         if (!strcmp(param->name, FIRSTBURSTLENGTH))
 794                                 SET_PSTATE_REPLY_OPTIONAL(param);
 795
 796                         /*
 797                          * Required for gPXE iSCSI boot client
 798                          */
 799                         if (!strcmp(param->name, MAXCONNECTIONS))
 800                                 SET_PSTATE_REPLY_OPTIONAL(param);
 801                 }
 802         } else if (IS_PHASE_DECLARATIVE(param))
 803                 SET_PSTATE_REPLY_OPTIONAL(param);
 804 }
 805
 806 static int iscsi_check_boolean_value(struct iscsi_param *param, char *value)
 807 {
 808         if (strcmp(value, YES) && strcmp(value, NO)) {
 809                 pr_err("Illegal value for \"%s\", must be either"
 810                         " \"%s\" or \"%s\".\n", param->name, YES, NO);
 811                 return -1;
 812         }
 813
 814         return 0;
 815 }
 816
 817 static int iscsi_check_numerical_value(struct iscsi_param *param, char *value_ptr)
 818 {
 819         char *tmpptr;
 820         int value = 0;
 821
 822         value = simple_strtoul(value_ptr, &tmpptr, 0);
 823
 824         if (IS_TYPERANGE_0_TO_2(param)) {
 825                 if ((value < 0) || (value > 2)) {
 826                         pr_err("Illegal value for \"%s\", must be"
 827                                 " between 0 and 2.\n", param->name);
 828                         return -1;
 829                 }
 830                 return 0;
 831         }
 832         if (IS_TYPERANGE_0_TO_3600(param)) {
 833                 if ((value < 0) || (value > 3600)) {
 834                         pr_err("Illegal value for \"%s\", must be"
 835                                 " between 0 and 3600.\n", param->name);
 836                         return -1;
 837                 }
 838                 return 0;
 839         }
 840         if (IS_TYPERANGE_0_TO_32767(param)) {
 841                 if ((value < 0) || (value > 32767)) {
 842                         pr_err("Illegal value for \"%s\", must be"
 843                                 " between 0 and 32767.\n", param->name);
 844                         return -1;
 845                 }
 846                 return 0;
 847         }
 848         if (IS_TYPERANGE_0_TO_65535(param)) {
 849                 if ((value < 0) || (value > 65535)) {
 850                         pr_err("Illegal value for \"%s\", must be"
 851                                 " between 0 and 65535.\n", param->name);
 852                         return -1;
 853                 }
 854                 return 0;
 855         }
 856         if (IS_TYPERANGE_1_TO_65535(param)) {
 857                 if ((value < 1) || (value > 65535)) {
 858                         pr_err("Illegal value for \"%s\", must be"
 859                                 " between 1 and 65535.\n", param->name);
 860                         return -1;
 861                 }
 862                 return 0;
 863         }
 864         if (IS_TYPERANGE_2_TO_3600(param)) {
 865                 if ((value < 2) || (value > 3600)) {
 866                         pr_err("Illegal value for \"%s\", must be"
 867                                 " between 2 and 3600.\n", param->name);
 868                         return -1;
 869                 }
 870                 return 0;
 871         }
 872         if (IS_TYPERANGE_512_TO_16777215(param)) {
 873                 if ((value < 512) || (value > 16777215)) {
 874                         pr_err("Illegal value for \"%s\", must be"
 875                                 " between 512 and 16777215.\n", param->name);
 876                         return -1;
 877                 }
 878                 return 0;
 879         }
 880
 881         return 0;
 882 }
 883
 884 static int iscsi_check_string_or_list_value(struct iscsi_param *param, char *value)
 885 {
 886         if (IS_PSTATE_PROPOSER(param))
 887                 return 0;
 888
 889         if (IS_TYPERANGE_AUTH_PARAM(param)) {
 890                 if (strcmp(value, KRB5) && strcmp(value, SPKM1) &&
 891                     strcmp(value, SPKM2) && strcmp(value, SRP) &&
 892                     strcmp(value, CHAP) && strcmp(value, NONE)) {
 893                         pr_err("Illegal value for \"%s\", must be"
 894                                 " \"%s\", \"%s\", \"%s\", \"%s\", \"%s\""
 895                                 " or \"%s\".\n", param->name, KRB5,
 896                                         SPKM1, SPKM2, SRP, CHAP, NONE);
 897                         return -1;
 898                 }
 899         }
 900         if (IS_TYPERANGE_DIGEST_PARAM(param)) {
 901                 if (strcmp(value, CRC32C) && strcmp(value, NONE)) {
 902                         pr_err("Illegal value for \"%s\", must be"
 903                                 " \"%s\" or \"%s\".\n", param->name,
 904                                         CRC32C, NONE);
 905                         return -1;
 906                 }
 907         }
 908         if (IS_TYPERANGE_SESSIONTYPE(param)) {
 909                 if (strcmp(value, DISCOVERY) && strcmp(value, NORMAL)) {
 910                         pr_err("Illegal value for \"%s\", must be"
 911                                 " \"%s\" or \"%s\".\n", param->name,
 912                                         DISCOVERY, NORMAL);
 913                         return -1;
 914                 }
 915         }
 916
 917         return 0;
 918 }
 919
 920 static char *iscsi_check_valuelist_for_support(
 921         struct iscsi_param *param,
 922         char *value)
 923 {
 924         char *tmp1 = NULL, *tmp2 = NULL;
 925         char *acceptor_values = NULL, *proposer_values = NULL;
 926
 927         acceptor_values = param->value;
 928         proposer_values = value;
 929
 930         do {
 931                 if (!proposer_values)
 932                         return NULL;
 933                 tmp1 = strchr(proposer_values, ',');
 934                 if (tmp1)
 935                         *tmp1 = '\0';
 936                 acceptor_values = param->value;
 937                 do {
 938                         if (!acceptor_values) {
 939                                 if (tmp1)
 940                                         *tmp1 = ',';
 941                                 return NULL;
 942                         }
 943                         tmp2 = strchr(acceptor_values, ',');
 944                         if (tmp2)
 945                                 *tmp2 = '\0';
 946                         if (!strcmp(acceptor_values, proposer_values)) {
 947                                 if (tmp2)
 948                                         *tmp2 = ',';
 949                                 goto out;
 950                         }
 951                         if (tmp2)
 952                                 *tmp2++ = ',';
 953
 954                         acceptor_values = tmp2;
 955                 } while (acceptor_values);
 956                 if (tmp1)
 957                         *tmp1++ = ',';
 958                 proposer_values = tmp1;
 959         } while (proposer_values);
 960
 961 out:
 962         return proposer_values;
 963 }
 964
 965 static int iscsi_check_acceptor_state(struct iscsi_param *param, char *value,
 966                                 struct iscsi_conn *conn)
 967 {
 968         u8 acceptor_boolean_value = 0, proposer_boolean_value = 0;
 969         char *negotiated_value = NULL;
 970
 971         if (IS_PSTATE_ACCEPTOR(param)) {
 972                 pr_err("Received key \"%s\" twice, protocol error.\n",
 973                                 param->name);
 974                 return -1;
 975         }
 976
 977         if (IS_PSTATE_REJECT(param))
 978                 return 0;
 979
 980         if (IS_TYPE_BOOL_AND(param)) {
 981                 if (!strcmp(value, YES))
 982                         proposer_boolean_value = 1;
 983                 if (!strcmp(param->value, YES))
 984                         acceptor_boolean_value = 1;
 985                 if (acceptor_boolean_value && proposer_boolean_value)
 986                         do {} while (0);
 987                 else {
 988                         if (iscsi_update_param_value(param, NO) < 0)
 989                                 return -1;
 990                         if (!proposer_boolean_value)
 991                                 SET_PSTATE_REPLY_OPTIONAL(param);
 992                 }
 993         } else if (IS_TYPE_BOOL_OR(param)) {
 994                 if (!strcmp(value, YES))
 995                         proposer_boolean_value = 1;
 996                 if (!strcmp(param->value, YES))
 997                         acceptor_boolean_value = 1;
 998                 if (acceptor_boolean_value || proposer_boolean_value) {
 999                         if (iscsi_update_param_value(param, YES) < 0)
1000                                 return -1;
1001                         if (proposer_boolean_value)
1002                                 SET_PSTATE_REPLY_OPTIONAL(param);
1003                 }
1004         } else if (IS_TYPE_NUMBER(param)) {
1005                 char *tmpptr, buf[11];
1006                 u32 acceptor_value = simple_strtoul(param->value, &tmpptr, 0);
1007                 u32 proposer_value = simple_strtoul(value, &tmpptr, 0);
1008
1009                 memset(buf, 0, sizeof(buf));
1010
1011                 if (!strcmp(param->name, MAXCONNECTIONS) ||
1012                     !strcmp(param->name, MAXBURSTLENGTH) ||
1013                     !strcmp(param->name, FIRSTBURSTLENGTH) ||
1014                     !strcmp(param->name, MAXOUTSTANDINGR2T) ||
1015                     !strcmp(param->name, DEFAULTTIME2RETAIN) ||
1016                     !strcmp(param->name, ERRORRECOVERYLEVEL)) {
1017                         if (proposer_value > acceptor_value) {
1018                                 sprintf(buf, "%u", acceptor_value);
1019                                 if (iscsi_update_param_value(param,
1020                                                 &buf[0]) < 0)
1021                                         return -1;
1022                         } else {
1023                                 if (iscsi_update_param_value(param, value) < 0)
1024                                         return -1;
1025                         }
1026                 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1027                         if (acceptor_value > proposer_value) {
1028                                 sprintf(buf, "%u", acceptor_value);
1029                                 if (iscsi_update_param_value(param,
1030                                                 &buf[0]) < 0)
1031                                         return -1;
1032                         } else {
1033                                 if (iscsi_update_param_value(param, value) < 0)
1034                                         return -1;
1035                         }
1036                 } else {
1037                         if (iscsi_update_param_value(param, value) < 0)
1038                                 return -1;
1039                 }
1040
1041                 if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1042                         struct iscsi_param *param_mxdsl;
1043                         unsigned long long tmp;
1044                         int rc;
1045
1046                         rc = kstrtoull(param->value, 0, &tmp);
1047                         if (rc < 0)
1048                                 return -1;
1049
1050                         conn->conn_ops->MaxRecvDataSegmentLength = tmp;
1051                         pr_debug("Saving op->MaxRecvDataSegmentLength from"
1052                                 " original initiator received value: %u\n",
1053                                 conn->conn_ops->MaxRecvDataSegmentLength);
1054
1055                         param_mxdsl = iscsi_find_param_from_key(
1056                                                 MAXXMITDATASEGMENTLENGTH,
1057                                                 conn->param_list);
1058                         if (!param_mxdsl)
1059                                 return -1;
1060
1061                         rc = iscsi_update_param_value(param,
1062                                                 param_mxdsl->value);
1063                         if (rc < 0)
1064                                 return -1;
1065
1066                         pr_debug("Updated %s to target MXDSL value: %s\n",
1067                                         param->name, param->value);
1068                 }
1069         } else if (IS_TYPE_VALUE_LIST(param)) {
1070                 negotiated_value = iscsi_check_valuelist_for_support(
1071                                         param, value);
1072                 if (!negotiated_value) {
1073                         pr_err("Proposer's value list \"%s\" contains"
1074                                 " no valid values from Acceptor's value list"
1075                                 " \"%s\".\n", value, param->value);
1076                         return -1;
1077                 }
1078                 if (iscsi_update_param_value(param, negotiated_value) < 0)
1079                         return -1;
1080         } else if (IS_PHASE_DECLARATIVE(param)) {
1081                 if (iscsi_update_param_value(param, value) < 0)
1082                         return -1;
1083                 SET_PSTATE_REPLY_OPTIONAL(param);
1084         }
1085
1086         return 0;
1087 }
1088
1089 static int iscsi_check_proposer_state(struct iscsi_param *param, char *value)
1090 {
1091         if (IS_PSTATE_RESPONSE_GOT(param)) {
1092                 pr_err("Received key \"%s\" twice, protocol error.\n",
1093                                 param->name);
1094                 return -1;
1095         }
1096
1097         if (IS_TYPE_VALUE_LIST(param)) {
1098                 char *comma_ptr = NULL, *tmp_ptr = NULL;
1099
1100                 comma_ptr = strchr(value, ',');
1101                 if (comma_ptr) {
1102                         pr_err("Illegal \",\" in response for \"%s\".\n",
1103                                         param->name);
1104                         return -1;
1105                 }
1106
1107                 tmp_ptr = iscsi_check_valuelist_for_support(param, value);
1108                 if (!tmp_ptr)
1109                         return -1;
1110         }
1111
1112         if (iscsi_update_param_value(param, value) < 0)
1113                 return -1;
1114
1115         return 0;
1116 }
1117
1118 static int iscsi_check_value(struct iscsi_param *param, char *value)
1119 {
1120         char *comma_ptr = NULL;
1121
1122         if (!strcmp(value, REJECT)) {
1123                 if (!strcmp(param->name, IFMARKINT) ||
1124                     !strcmp(param->name, OFMARKINT)) {
1125                         /*
1126                          * Reject is not fatal for [I,O]FMarkInt,  and causes
1127                          * [I,O]FMarker to be reset to No. (See iSCSI v20 A.3.2)
1128                          */
1129                         SET_PSTATE_REJECT(param);
1130                         return 0;
1131                 }
1132                 pr_err("Received %s=%s\n", param->name, value);
1133                 return -1;
1134         }
1135         if (!strcmp(value, IRRELEVANT)) {
1136                 pr_debug("Received %s=%s\n", param->name, value);
1137                 SET_PSTATE_IRRELEVANT(param);
1138                 return 0;
1139         }
1140         if (!strcmp(value, NOTUNDERSTOOD)) {
1141                 if (!IS_PSTATE_PROPOSER(param)) {
1142                         pr_err("Received illegal offer %s=%s\n",
1143                                 param->name, value);
1144                         return -1;
1145                 }
1146
1147 /* #warning FIXME: Add check for X-ExtensionKey here */
1148                 pr_err("Standard iSCSI key \"%s\" cannot be answered"
1149                         " with \"%s\", protocol error.\n", param->name, value);
1150                 return -1;
1151         }
1152
1153         do {
1154                 comma_ptr = NULL;
1155                 comma_ptr = strchr(value, ',');
1156
1157                 if (comma_ptr && !IS_TYPE_VALUE_LIST(param)) {
1158                         pr_err("Detected value separator \",\", but"
1159                                 " key \"%s\" does not allow a value list,"
1160                                 " protocol error.\n", param->name);
1161                         return -1;
1162                 }
1163                 if (comma_ptr)
1164                         *comma_ptr = '\0';
1165
1166                 if (strlen(value) > VALUE_MAXLEN) {
1167                         pr_err("Value for key \"%s\" exceeds %d,"
1168                                 " protocol error.\n", param->name,
1169                                 VALUE_MAXLEN);
1170                         return -1;
1171                 }
1172
1173                 if (IS_TYPE_BOOL_AND(param) || IS_TYPE_BOOL_OR(param)) {
1174                         if (iscsi_check_boolean_value(param, value) < 0)
1175                                 return -1;
1176                 } else if (IS_TYPE_NUMBER(param)) {
1177                         if (iscsi_check_numerical_value(param, value) < 0)
1178                                 return -1;
1179                 } else if (IS_TYPE_STRING(param) || IS_TYPE_VALUE_LIST(param)) {
1180                         if (iscsi_check_string_or_list_value(param, value) < 0)
1181                                 return -1;
1182                 } else {
1183                         pr_err("Huh? 0x%02x\n", param->type);
1184                         return -1;
1185                 }
1186
1187                 if (comma_ptr)
1188                         *comma_ptr++ = ',';
1189
1190                 value = comma_ptr;
1191         } while (value);
1192
1193         return 0;
1194 }
1195
1196 static struct iscsi_param *__iscsi_check_key(
1197         char *key,
1198         int sender,
1199         struct iscsi_param_list *param_list)
1200 {
1201         struct iscsi_param *param;
1202
1203         if (strlen(key) > KEY_MAXLEN) {
1204                 pr_err("Length of key name \"%s\" exceeds %d.\n",
1205                         key, KEY_MAXLEN);
1206                 return NULL;
1207         }
1208
1209         param = iscsi_find_param_from_key(key, param_list);
1210         if (!param)
1211                 return NULL;
1212
1213         if ((sender & SENDER_INITIATOR) && !IS_SENDER_INITIATOR(param)) {
1214                 pr_err("Key \"%s\" may not be sent to %s,"
1215                         " protocol error.\n", param->name,
1216                         (sender & SENDER_RECEIVER) ? "target" : "initiator");
1217                 return NULL;
1218         }
1219
1220         if ((sender & SENDER_TARGET) && !IS_SENDER_TARGET(param)) {
1221                 pr_err("Key \"%s\" may not be sent to %s,"
1222                         " protocol error.\n", param->name,
1223                         (sender & SENDER_RECEIVER) ? "initiator" : "target");
1224                 return NULL;
1225         }
1226
1227         return param;
1228 }
1229
1230 static struct iscsi_param *iscsi_check_key(
1231         char *key,
1232         int phase,
1233         int sender,
1234         struct iscsi_param_list *param_list)
1235 {
1236         struct iscsi_param *param;
1237         /*
1238          * Key name length must not exceed 63 bytes. (See iSCSI v20 5.1)
1239          */
1240         if (strlen(key) > KEY_MAXLEN) {
1241                 pr_err("Length of key name \"%s\" exceeds %d.\n",
1242                         key, KEY_MAXLEN);
1243                 return NULL;
1244         }
1245
1246         param = iscsi_find_param_from_key(key, param_list);
1247         if (!param)
1248                 return NULL;
1249
1250         if ((sender & SENDER_INITIATOR) && !IS_SENDER_INITIATOR(param)) {
1251                 pr_err("Key \"%s\" may not be sent to %s,"
1252                         " protocol error.\n", param->name,
1253                         (sender & SENDER_RECEIVER) ? "target" : "initiator");
1254                 return NULL;
1255         }
1256         if ((sender & SENDER_TARGET) && !IS_SENDER_TARGET(param)) {
1257                 pr_err("Key \"%s\" may not be sent to %s,"
1258                                 " protocol error.\n", param->name,
1259                         (sender & SENDER_RECEIVER) ? "initiator" : "target");
1260                 return NULL;
1261         }
1262
1263         if (IS_PSTATE_ACCEPTOR(param)) {
1264                 pr_err("Key \"%s\" received twice, protocol error.\n",
1265                                 key);
1266                 return NULL;
1267         }
1268
1269         if (!phase)
1270                 return param;
1271
1272         if (!(param->phase & phase)) {
1273                 pr_err("Key \"%s\" may not be negotiated during ",
1274                                 param->name);
1275                 switch (phase) {
1276                 case PHASE_SECURITY:
1277                         pr_debug("Security phase.\n");
1278                         break;
1279                 case PHASE_OPERATIONAL:
1280                         pr_debug("Operational phase.\n");
1281                         break;
1282                 default:
1283                         pr_debug("Unknown phase.\n");
1284                 }
1285                 return NULL;
1286         }
1287
1288         return param;
1289 }
1290
1291 static int iscsi_enforce_integrity_rules(
1292         u8 phase,
1293         struct iscsi_param_list *param_list)
1294 {
1295         char *tmpptr;
1296         u8 DataSequenceInOrder = 0;
1297         u8 ErrorRecoveryLevel = 0, SessionType = 0;
1298         u32 FirstBurstLength = 0, MaxBurstLength = 0;
1299         struct iscsi_param *param = NULL;
1300
1301         list_for_each_entry(param, &param_list->param_list, p_list) {
1302                 if (!(param->phase & phase))
1303                         continue;
1304                 if (!strcmp(param->name, SESSIONTYPE))
1305                         if (!strcmp(param->value, NORMAL))
1306                                 SessionType = 1;
1307                 if (!strcmp(param->name, ERRORRECOVERYLEVEL))
1308                         ErrorRecoveryLevel = simple_strtoul(param->value,
1309                                         &tmpptr, 0);
1310                 if (!strcmp(param->name, DATASEQUENCEINORDER))
1311                         if (!strcmp(param->value, YES))
1312                                 DataSequenceInOrder = 1;
1313                 if (!strcmp(param->name, MAXBURSTLENGTH))
1314                         MaxBurstLength = simple_strtoul(param->value,
1315                                         &tmpptr, 0);
1316         }
1317
1318         list_for_each_entry(param, &param_list->param_list, p_list) {
1319                 if (!(param->phase & phase))
1320                         continue;
1321                 if (!SessionType && !IS_PSTATE_ACCEPTOR(param))
1322                         continue;
1323                 if (!strcmp(param->name, MAXOUTSTANDINGR2T) &&
1324                     DataSequenceInOrder && (ErrorRecoveryLevel > 0)) {
1325                         if (strcmp(param->value, "1")) {
1326                                 if (iscsi_update_param_value(param, "1") < 0)
1327                                         return -1;
1328                                 pr_debug("Reset \"%s\" to \"%s\".\n",
1329                                         param->name, param->value);
1330                         }
1331                 }
1332                 if (!strcmp(param->name, MAXCONNECTIONS) && !SessionType) {
1333                         if (strcmp(param->value, "1")) {
1334                                 if (iscsi_update_param_value(param, "1") < 0)
1335                                         return -1;
1336                                 pr_debug("Reset \"%s\" to \"%s\".\n",
1337                                         param->name, param->value);
1338                         }
1339                 }
1340                 if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1341                         FirstBurstLength = simple_strtoul(param->value,
1342                                         &tmpptr, 0);
1343                         if (FirstBurstLength > MaxBurstLength) {
1344                                 char tmpbuf[11];
1345                                 memset(tmpbuf, 0, sizeof(tmpbuf));
1346                                 sprintf(tmpbuf, "%u", MaxBurstLength);
1347                                 if (iscsi_update_param_value(param, tmpbuf))
1348                                         return -1;
1349                                 pr_debug("Reset \"%s\" to \"%s\".\n",
1350                                         param->name, param->value);
1351                         }
1352                 }
1353         }
1354
1355         return 0;
1356 }
1357
1358 int iscsi_decode_text_input(
1359         u8 phase,
1360         u8 sender,
1361         char *textbuf,
1362         u32 length,
1363         struct iscsi_conn *conn)
1364 {
1365         struct iscsi_param_list *param_list = conn->param_list;
1366         char *tmpbuf, *start = NULL, *end = NULL;
1367
1368         tmpbuf = kzalloc(length + 1, GFP_KERNEL);
1369         if (!tmpbuf) {
1370                 pr_err("Unable to allocate %u + 1 bytes for tmpbuf.\n", length);
1371                 return -ENOMEM;
1372         }
1373
1374         memcpy(tmpbuf, textbuf, length);
1375         tmpbuf[length] = '\0';
1376         start = tmpbuf;
1377         end = (start + length);
1378
1379         while (start < end) {
1380                 char *key, *value;
1381                 struct iscsi_param *param;
1382
1383                 if (iscsi_extract_key_value(start, &key, &value) < 0)
1384                         goto free_buffer;
1385
1386                 pr_debug("Got key: %s=%s\n", key, value);
1387
1388                 if (phase & PHASE_SECURITY) {
1389                         if (iscsi_check_for_auth_key(key) > 0) {
1390                                 kfree(tmpbuf);
1391                                 return 1;
1392                         }
1393                 }
1394
1395                 param = iscsi_check_key(key, phase, sender, param_list);
1396                 if (!param) {
1397                         if (iscsi_add_notunderstood_response(key, value,
1398                                                              param_list) < 0)
1399                                 goto free_buffer;
1400
1401                         start += strlen(key) + strlen(value) + 2;
1402                         continue;
1403                 }
1404                 if (iscsi_check_value(param, value) < 0)
1405                         goto free_buffer;
1406
1407                 start += strlen(key) + strlen(value) + 2;
1408
1409                 if (IS_PSTATE_PROPOSER(param)) {
1410                         if (iscsi_check_proposer_state(param, value) < 0)
1411                                 goto free_buffer;
1412
1413                         SET_PSTATE_RESPONSE_GOT(param);
1414                 } else {
1415                         if (iscsi_check_acceptor_state(param, value, conn) < 0)
1416                                 goto free_buffer;
1417
1418                         SET_PSTATE_ACCEPTOR(param);
1419                 }
1420         }
1421
1422         kfree(tmpbuf);
1423         return 0;
1424
1425 free_buffer:
1426         kfree(tmpbuf);
1427         return -1;
1428 }
1429
1430 int iscsi_encode_text_output(
1431         u8 phase,
1432         u8 sender,
1433         char *textbuf,
1434         u32 *length,
1435         struct iscsi_param_list *param_list,
1436         bool keys_workaround)
1437 {
1438         char *output_buf = NULL;
1439         struct iscsi_extra_response *er;
1440         struct iscsi_param *param;
1441
1442         output_buf = textbuf + *length;
1443
1444         if (iscsi_enforce_integrity_rules(phase, param_list) < 0)
1445                 return -1;
1446
1447         list_for_each_entry(param, &param_list->param_list, p_list) {
1448                 if (!(param->sender & sender))
1449                         continue;
1450                 if (IS_PSTATE_ACCEPTOR(param) &&
1451                     !IS_PSTATE_RESPONSE_SENT(param) &&
1452                     !IS_PSTATE_REPLY_OPTIONAL(param) &&
1453                     (param->phase & phase)) {
1454                         *length += sprintf(output_buf, "%s=%s",
1455                                 param->name, param->value);
1456                         *length += 1;
1457                         output_buf = textbuf + *length;
1458                         SET_PSTATE_RESPONSE_SENT(param);
1459                         pr_debug("Sending key: %s=%s\n",
1460                                 param->name, param->value);
1461                         continue;
1462                 }
1463                 if (IS_PSTATE_NEGOTIATE(param) &&
1464                     !IS_PSTATE_ACCEPTOR(param) &&
1465                     !IS_PSTATE_PROPOSER(param) &&
1466                     (param->phase & phase)) {
1467                         *length += sprintf(output_buf, "%s=%s",
1468                                 param->name, param->value);
1469                         *length += 1;
1470                         output_buf = textbuf + *length;
1471                         SET_PSTATE_PROPOSER(param);
1472                         iscsi_check_proposer_for_optional_reply(param,
1473                                                                 keys_workaround);
1474                         pr_debug("Sending key: %s=%s\n",
1475                                 param->name, param->value);
1476                 }
1477         }
1478
1479         list_for_each_entry(er, &param_list->extra_response_list, er_list) {
1480                 *length += sprintf(output_buf, "%s=%s", er->key, er->value);
1481                 *length += 1;
1482                 output_buf = textbuf + *length;
1483                 pr_debug("Sending key: %s=%s\n", er->key, er->value);
1484         }
1485         iscsi_release_extra_responses(param_list);
1486
1487         return 0;
1488 }
1489
1490 int iscsi_check_negotiated_keys(struct iscsi_param_list *param_list)
1491 {
1492         int ret = 0;
1493         struct iscsi_param *param;
1494
1495         list_for_each_entry(param, &param_list->param_list, p_list) {
1496                 if (IS_PSTATE_NEGOTIATE(param) &&
1497                     IS_PSTATE_PROPOSER(param) &&
1498                     !IS_PSTATE_RESPONSE_GOT(param) &&
1499                     !IS_PSTATE_REPLY_OPTIONAL(param) &&
1500                     !IS_PHASE_DECLARATIVE(param)) {
1501                         pr_err("No response for proposed key \"%s\".\n",
1502                                         param->name);
1503                         ret = -1;
1504                 }
1505         }
1506
1507         return ret;
1508 }
1509
1510 int iscsi_change_param_value(
1511         char *keyvalue,
1512         struct iscsi_param_list *param_list,
1513         int check_key)
1514 {
1515         char *key = NULL, *value = NULL;
1516         struct iscsi_param *param;
1517         int sender = 0;
1518
1519         if (iscsi_extract_key_value(keyvalue, &key, &value) < 0)
1520                 return -1;
1521
1522         if (!check_key) {
1523                 param = __iscsi_check_key(keyvalue, sender, param_list);
1524                 if (!param)
1525                         return -1;
1526         } else {
1527                 param = iscsi_check_key(keyvalue, 0, sender, param_list);
1528                 if (!param)
1529                         return -1;
1530
1531                 param->set_param = 1;
1532                 if (iscsi_check_value(param, value) < 0) {
1533                         param->set_param = 0;
1534                         return -1;
1535                 }
1536                 param->set_param = 0;
1537         }
1538
1539         if (iscsi_update_param_value(param, value) < 0)
1540                 return -1;
1541
1542         return 0;
1543 }
1544
1545 void iscsi_set_connection_parameters(
1546         struct iscsi_conn_ops *ops,
1547         struct iscsi_param_list *param_list)
1548 {
1549         char *tmpptr;
1550         struct iscsi_param *param;
1551
1552         pr_debug("---------------------------------------------------"
1553                         "---------------\n");
1554         list_for_each_entry(param, &param_list->param_list, p_list) {
1555                 /*
1556                  * Special case to set MAXXMITDATASEGMENTLENGTH from the
1557                  * target requested MaxRecvDataSegmentLength, even though
1558                  * this key is not sent over the wire.
1559                  */
1560                 if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
1561                         ops->MaxXmitDataSegmentLength =
1562                                 simple_strtoul(param->value, &tmpptr, 0);
1563                         pr_debug("MaxXmitDataSegmentLength:     %s\n",
1564                                 param->value);
1565                 }
1566
1567                 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1568                         continue;
1569                 if (!strcmp(param->name, AUTHMETHOD)) {
1570                         pr_debug("AuthMethod:                   %s\n",
1571                                 param->value);
1572                 } else if (!strcmp(param->name, HEADERDIGEST)) {
1573                         ops->HeaderDigest = !strcmp(param->value, CRC32C);
1574                         pr_debug("HeaderDigest:                 %s\n",
1575                                 param->value);
1576                 } else if (!strcmp(param->name, DATADIGEST)) {
1577                         ops->DataDigest = !strcmp(param->value, CRC32C);
1578                         pr_debug("DataDigest:                   %s\n",
1579                                 param->value);
1580                 } else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
1581                         /*
1582                          * At this point iscsi_check_acceptor_state() will have
1583                          * set ops->MaxRecvDataSegmentLength from the original
1584                          * initiator provided value.
1585                          */
1586                         pr_debug("MaxRecvDataSegmentLength:     %u\n",
1587                                 ops->MaxRecvDataSegmentLength);
1588                 } else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
1589                         ops->InitiatorRecvDataSegmentLength =
1590                                 simple_strtoul(param->value, &tmpptr, 0);
1591                         pr_debug("InitiatorRecvDataSegmentLength: %s\n",
1592                                 param->value);
1593                         ops->MaxRecvDataSegmentLength =
1594                                         ops->InitiatorRecvDataSegmentLength;
1595                         pr_debug("Set MRDSL from InitiatorRecvDataSegmentLength\n");
1596                 } else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
1597                         ops->TargetRecvDataSegmentLength =
1598                                 simple_strtoul(param->value, &tmpptr, 0);
1599                         pr_debug("TargetRecvDataSegmentLength:  %s\n",
1600                                 param->value);
1601                         ops->MaxXmitDataSegmentLength =
1602                                         ops->TargetRecvDataSegmentLength;
1603                         pr_debug("Set MXDSL from TargetRecvDataSegmentLength\n");
1604                 }
1605         }
1606         pr_debug("----------------------------------------------------"
1607                         "--------------\n");
1608 }
1609
1610 void iscsi_set_session_parameters(
1611         struct iscsi_sess_ops *ops,
1612         struct iscsi_param_list *param_list,
1613         int leading)
1614 {
1615         char *tmpptr;
1616         struct iscsi_param *param;
1617
1618         pr_debug("----------------------------------------------------"
1619                         "--------------\n");
1620         list_for_each_entry(param, &param_list->param_list, p_list) {
1621                 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
1622                         continue;
1623                 if (!strcmp(param->name, INITIATORNAME)) {
1624                         if (!param->value)
1625                                 continue;
1626                         if (leading)
1627                                 snprintf(ops->InitiatorName,
1628                                                 sizeof(ops->InitiatorName),
1629                                                 "%s", param->value);
1630                         pr_debug("InitiatorName:                %s\n",
1631                                 param->value);
1632                 } else if (!strcmp(param->name, INITIATORALIAS)) {
1633                         if (!param->value)
1634                                 continue;
1635                         snprintf(ops->InitiatorAlias,
1636                                                 sizeof(ops->InitiatorAlias),
1637                                                 "%s", param->value);
1638                         pr_debug("InitiatorAlias:               %s\n",
1639                                 param->value);
1640                 } else if (!strcmp(param->name, TARGETNAME)) {
1641                         if (!param->value)
1642                                 continue;
1643                         if (leading)
1644                                 snprintf(ops->TargetName,
1645                                                 sizeof(ops->TargetName),
1646                                                 "%s", param->value);
1647                         pr_debug("TargetName:                   %s\n",
1648                                 param->value);
1649                 } else if (!strcmp(param->name, TARGETALIAS)) {
1650                         if (!param->value)
1651                                 continue;
1652                         snprintf(ops->TargetAlias, sizeof(ops->TargetAlias),
1653                                         "%s", param->value);
1654                         pr_debug("TargetAlias:                  %s\n",
1655                                 param->value);
1656                 } else if (!strcmp(param->name, TARGETPORTALGROUPTAG)) {
1657                         ops->TargetPortalGroupTag =
1658                                 simple_strtoul(param->value, &tmpptr, 0);
1659                         pr_debug("TargetPortalGroupTag:         %s\n",
1660                                 param->value);
1661                 } else if (!strcmp(param->name, MAXCONNECTIONS)) {
1662                         ops->MaxConnections =
1663                                 simple_strtoul(param->value, &tmpptr, 0);
1664                         pr_debug("MaxConnections:               %s\n",
1665                                 param->value);
1666                 } else if (!strcmp(param->name, INITIALR2T)) {
1667                         ops->InitialR2T = !strcmp(param->value, YES);
1668                         pr_debug("InitialR2T:                   %s\n",
1669                                 param->value);
1670                 } else if (!strcmp(param->name, IMMEDIATEDATA)) {
1671                         ops->ImmediateData = !strcmp(param->value, YES);
1672                         pr_debug("ImmediateData:                %s\n",
1673                                 param->value);
1674                 } else if (!strcmp(param->name, MAXBURSTLENGTH)) {
1675                         ops->MaxBurstLength =
1676                                 simple_strtoul(param->value, &tmpptr, 0);
1677                         pr_debug("MaxBurstLength:               %s\n",
1678                                 param->value);
1679                 } else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
1680                         ops->FirstBurstLength =
1681                                 simple_strtoul(param->value, &tmpptr, 0);
1682                         pr_debug("FirstBurstLength:             %s\n",
1683                                 param->value);
1684                 } else if (!strcmp(param->name, DEFAULTTIME2WAIT)) {
1685                         ops->DefaultTime2Wait =
1686                                 simple_strtoul(param->value, &tmpptr, 0);
1687                         pr_debug("DefaultTime2Wait:             %s\n",
1688                                 param->value);
1689                 } else if (!strcmp(param->name, DEFAULTTIME2RETAIN)) {
1690                         ops->DefaultTime2Retain =
1691                                 simple_strtoul(param->value, &tmpptr, 0);
1692                         pr_debug("DefaultTime2Retain:           %s\n",
1693                                 param->value);
1694                 } else if (!strcmp(param->name, MAXOUTSTANDINGR2T)) {
1695                         ops->MaxOutstandingR2T =
1696                                 simple_strtoul(param->value, &tmpptr, 0);
1697                         pr_debug("MaxOutstandingR2T:            %s\n",
1698                                 param->value);
1699                 } else if (!strcmp(param->name, DATAPDUINORDER)) {
1700                         ops->DataPDUInOrder = !strcmp(param->value, YES);
1701                         pr_debug("DataPDUInOrder:               %s\n",
1702                                 param->value);
1703                 } else if (!strcmp(param->name, DATASEQUENCEINORDER)) {
1704                         ops->DataSequenceInOrder = !strcmp(param->value, YES);
1705                         pr_debug("DataSequenceInOrder:          %s\n",
1706                                 param->value);
1707                 } else if (!strcmp(param->name, ERRORRECOVERYLEVEL)) {
1708                         ops->ErrorRecoveryLevel =
1709                                 simple_strtoul(param->value, &tmpptr, 0);
1710                         pr_debug("ErrorRecoveryLevel:           %s\n",
1711                                 param->value);
1712                 } else if (!strcmp(param->name, SESSIONTYPE)) {
1713                         ops->SessionType = !strcmp(param->value, DISCOVERY);
1714                         pr_debug("SessionType:                  %s\n",
1715                                 param->value);
1716                 } else if (!strcmp(param->name, RDMAEXTENSIONS)) {
1717                         ops->RDMAExtensions = !strcmp(param->value, YES);
1718                         pr_debug("RDMAExtensions:               %s\n",
1719                                 param->value);
1720                 }
1721         }
1722         pr_debug("----------------------------------------------------"
1723                         "--------------\n");
1724
1725 }