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