drivers/target/iscsi/iscsi_target_tpg.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains iSCSI Target Portal Group related functions.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <[email protected]>
   8  *
   9  ******************************************************************************/
  10
  11 #include <linux/slab.h>
  12 #include <target/target_core_base.h>
  13 #include <target/target_core_fabric.h>
  14 #include <target/iscsi/iscsi_target_core.h>
  15 #include "iscsi_target_erl0.h"
  16 #include "iscsi_target_login.h"
  17 #include "iscsi_target_nodeattrib.h"
  18 #include "iscsi_target_tpg.h"
  19 #include "iscsi_target_util.h"
  20 #include "iscsi_target.h"
  21 #include "iscsi_target_parameters.h"
  22
  23 #include <target/iscsi/iscsi_transport.h>
  24
  25 struct iscsi_portal_group *iscsit_alloc_portal_group(struct iscsi_tiqn *tiqn, u16 tpgt)
  26 {
  27         struct iscsi_portal_group *tpg;
  28
  29         tpg = kzalloc(sizeof(struct iscsi_portal_group), GFP_KERNEL);
  30         if (!tpg) {
  31                 pr_err("Unable to allocate struct iscsi_portal_group\n");
  32                 return NULL;
  33         }
  34
  35         tpg->tpgt = tpgt;
  36         tpg->tpg_state = TPG_STATE_FREE;
  37         tpg->tpg_tiqn = tiqn;
  38         INIT_LIST_HEAD(&tpg->tpg_gnp_list);
  39         INIT_LIST_HEAD(&tpg->tpg_list);
  40         mutex_init(&tpg->tpg_access_lock);
  41         sema_init(&tpg->np_login_sem, 1);
  42         spin_lock_init(&tpg->tpg_state_lock);
  43         spin_lock_init(&tpg->tpg_np_lock);
  44
  45         return tpg;
  46 }
  47
  48 static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *);
  49
  50 int iscsit_load_discovery_tpg(void)
  51 {
  52         struct iscsi_param *param;
  53         struct iscsi_portal_group *tpg;
  54         int ret;
  55
  56         tpg = iscsit_alloc_portal_group(NULL, 1);
  57         if (!tpg) {
  58                 pr_err("Unable to allocate struct iscsi_portal_group\n");
  59                 return -1;
  60         }
  61         /*
  62          * Save iscsi_ops pointer for special case discovery TPG that
  63          * doesn't exist as se_wwn->wwn_group within configfs.
  64          */
  65         tpg->tpg_se_tpg.se_tpg_tfo = &iscsi_ops;
  66         ret = core_tpg_register(NULL, &tpg->tpg_se_tpg, -1);
  67         if (ret < 0) {
  68                 kfree(tpg);
  69                 return -1;
  70         }
  71
  72         tpg->sid = 1; /* First Assigned LIO Session ID */
  73         iscsit_set_default_tpg_attribs(tpg);
  74
  75         if (iscsi_create_default_params(&tpg->param_list) < 0)
  76                 goto out;
  77         /*
  78          * By default we disable authentication for discovery sessions,
  79          * this can be changed with:
  80          *
  81          * /sys/kernel/config/target/iscsi/discovery_auth/enforce_discovery_auth
  82          */
  83         param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
  84         if (!param)
  85                 goto free_pl_out;
  86
  87         if (iscsi_update_param_value(param, "CHAP,None") < 0)
  88                 goto free_pl_out;
  89
  90         tpg->tpg_attrib.authentication = 0;
  91
  92         spin_lock(&tpg->tpg_state_lock);
  93         tpg->tpg_state  = TPG_STATE_ACTIVE;
  94         spin_unlock(&tpg->tpg_state_lock);
  95
  96         iscsit_global->discovery_tpg = tpg;
  97         pr_debug("CORE[0] - Allocated Discovery TPG\n");
  98
  99         return 0;
 100 free_pl_out:
 101         iscsi_release_param_list(tpg->param_list);
 102 out:
 103         if (tpg->sid == 1)
 104                 core_tpg_deregister(&tpg->tpg_se_tpg);
 105         kfree(tpg);
 106         return -1;
 107 }
 108
 109 void iscsit_release_discovery_tpg(void)
 110 {
 111         struct iscsi_portal_group *tpg = iscsit_global->discovery_tpg;
 112
 113         if (!tpg)
 114                 return;
 115
 116         iscsi_release_param_list(tpg->param_list);
 117         core_tpg_deregister(&tpg->tpg_se_tpg);
 118
 119         kfree(tpg);
 120         iscsit_global->discovery_tpg = NULL;
 121 }
 122
 123 struct iscsi_portal_group *iscsit_get_tpg_from_np(
 124         struct iscsi_tiqn *tiqn,
 125         struct iscsi_np *np,
 126         struct iscsi_tpg_np **tpg_np_out)
 127 {
 128         struct iscsi_portal_group *tpg = NULL;
 129         struct iscsi_tpg_np *tpg_np;
 130
 131         spin_lock(&tiqn->tiqn_tpg_lock);
 132         list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
 133
 134                 spin_lock(&tpg->tpg_state_lock);
 135                 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 136                         spin_unlock(&tpg->tpg_state_lock);
 137                         continue;
 138                 }
 139                 spin_unlock(&tpg->tpg_state_lock);
 140
 141                 spin_lock(&tpg->tpg_np_lock);
 142                 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
 143                         if (tpg_np->tpg_np == np) {
 144                                 *tpg_np_out = tpg_np;
 145                                 kref_get(&tpg_np->tpg_np_kref);
 146                                 spin_unlock(&tpg->tpg_np_lock);
 147                                 spin_unlock(&tiqn->tiqn_tpg_lock);
 148                                 return tpg;
 149                         }
 150                 }
 151                 spin_unlock(&tpg->tpg_np_lock);
 152         }
 153         spin_unlock(&tiqn->tiqn_tpg_lock);
 154
 155         return NULL;
 156 }
 157
 158 int iscsit_get_tpg(
 159         struct iscsi_portal_group *tpg)
 160 {
 161         return mutex_lock_interruptible(&tpg->tpg_access_lock);
 162 }
 163
 164 void iscsit_put_tpg(struct iscsi_portal_group *tpg)
 165 {
 166         mutex_unlock(&tpg->tpg_access_lock);
 167 }
 168
 169 static void iscsit_clear_tpg_np_login_thread(
 170         struct iscsi_tpg_np *tpg_np,
 171         struct iscsi_portal_group *tpg,
 172         bool shutdown)
 173 {
 174         if (!tpg_np->tpg_np) {
 175                 pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
 176                 return;
 177         }
 178
 179         if (shutdown)
 180                 tpg_np->tpg_np->enabled = false;
 181         iscsit_reset_np_thread(tpg_np->tpg_np, tpg_np, tpg, shutdown);
 182 }
 183
 184 static void iscsit_clear_tpg_np_login_threads(
 185         struct iscsi_portal_group *tpg,
 186         bool shutdown)
 187 {
 188         struct iscsi_tpg_np *tpg_np;
 189
 190         spin_lock(&tpg->tpg_np_lock);
 191         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
 192                 if (!tpg_np->tpg_np) {
 193                         pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
 194                         continue;
 195                 }
 196                 spin_unlock(&tpg->tpg_np_lock);
 197                 iscsit_clear_tpg_np_login_thread(tpg_np, tpg, shutdown);
 198                 spin_lock(&tpg->tpg_np_lock);
 199         }
 200         spin_unlock(&tpg->tpg_np_lock);
 201 }
 202
 203 void iscsit_tpg_dump_params(struct iscsi_portal_group *tpg)
 204 {
 205         iscsi_print_params(tpg->param_list);
 206 }
 207
 208 static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *tpg)
 209 {
 210         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 211
 212         a->authentication = TA_AUTHENTICATION;
 213         a->login_timeout = TA_LOGIN_TIMEOUT;
 214         a->default_cmdsn_depth = TA_DEFAULT_CMDSN_DEPTH;
 215         a->generate_node_acls = TA_GENERATE_NODE_ACLS;
 216         a->cache_dynamic_acls = TA_CACHE_DYNAMIC_ACLS;
 217         a->demo_mode_write_protect = TA_DEMO_MODE_WRITE_PROTECT;
 218         a->prod_mode_write_protect = TA_PROD_MODE_WRITE_PROTECT;
 219         a->demo_mode_discovery = TA_DEMO_MODE_DISCOVERY;
 220         a->default_erl = TA_DEFAULT_ERL;
 221         a->t10_pi = TA_DEFAULT_T10_PI;
 222         a->fabric_prot_type = TA_DEFAULT_FABRIC_PROT_TYPE;
 223         a->tpg_enabled_sendtargets = TA_DEFAULT_TPG_ENABLED_SENDTARGETS;
 224         a->login_keys_workaround = TA_DEFAULT_LOGIN_KEYS_WORKAROUND;
 225 }
 226
 227 int iscsit_tpg_add_portal_group(struct iscsi_tiqn *tiqn, struct iscsi_portal_group *tpg)
 228 {
 229         if (tpg->tpg_state != TPG_STATE_FREE) {
 230                 pr_err("Unable to add iSCSI Target Portal Group: %d"
 231                         " while not in TPG_STATE_FREE state.\n", tpg->tpgt);
 232                 return -EEXIST;
 233         }
 234         iscsit_set_default_tpg_attribs(tpg);
 235
 236         if (iscsi_create_default_params(&tpg->param_list) < 0)
 237                 goto err_out;
 238
 239         tpg->tpg_attrib.tpg = tpg;
 240
 241         spin_lock(&tpg->tpg_state_lock);
 242         tpg->tpg_state  = TPG_STATE_INACTIVE;
 243         spin_unlock(&tpg->tpg_state_lock);
 244
 245         spin_lock(&tiqn->tiqn_tpg_lock);
 246         list_add_tail(&tpg->tpg_list, &tiqn->tiqn_tpg_list);
 247         tiqn->tiqn_ntpgs++;
 248         pr_debug("CORE[%s]_TPG[%hu] - Added iSCSI Target Portal Group\n",
 249                         tiqn->tiqn, tpg->tpgt);
 250         spin_unlock(&tiqn->tiqn_tpg_lock);
 251
 252         return 0;
 253 err_out:
 254         if (tpg->param_list) {
 255                 iscsi_release_param_list(tpg->param_list);
 256                 tpg->param_list = NULL;
 257         }
 258         return -ENOMEM;
 259 }
 260
 261 int iscsit_tpg_del_portal_group(
 262         struct iscsi_tiqn *tiqn,
 263         struct iscsi_portal_group *tpg,
 264         int force)
 265 {
 266         u8 old_state = tpg->tpg_state;
 267
 268         spin_lock(&tpg->tpg_state_lock);
 269         tpg->tpg_state = TPG_STATE_INACTIVE;
 270         spin_unlock(&tpg->tpg_state_lock);
 271
 272         if (iscsit_release_sessions_for_tpg(tpg, force) < 0) {
 273                 pr_err("Unable to delete iSCSI Target Portal Group:"
 274                         " %hu while active sessions exist, and force=0\n",
 275                         tpg->tpgt);
 276                 tpg->tpg_state = old_state;
 277                 return -EPERM;
 278         }
 279
 280         if (tpg->param_list) {
 281                 iscsi_release_param_list(tpg->param_list);
 282                 tpg->param_list = NULL;
 283         }
 284
 285         core_tpg_deregister(&tpg->tpg_se_tpg);
 286
 287         spin_lock(&tpg->tpg_state_lock);
 288         tpg->tpg_state = TPG_STATE_FREE;
 289         spin_unlock(&tpg->tpg_state_lock);
 290
 291         spin_lock(&tiqn->tiqn_tpg_lock);
 292         tiqn->tiqn_ntpgs--;
 293         list_del(&tpg->tpg_list);
 294         spin_unlock(&tiqn->tiqn_tpg_lock);
 295
 296         pr_debug("CORE[%s]_TPG[%hu] - Deleted iSCSI Target Portal Group\n",
 297                         tiqn->tiqn, tpg->tpgt);
 298
 299         kfree(tpg);
 300         return 0;
 301 }
 302
 303 int iscsit_tpg_enable_portal_group(struct iscsi_portal_group *tpg)
 304 {
 305         struct iscsi_param *param;
 306         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 307         int ret;
 308
 309         if (tpg->tpg_state == TPG_STATE_ACTIVE) {
 310                 pr_err("iSCSI target portal group: %hu is already"
 311                         " active, ignoring request.\n", tpg->tpgt);
 312                 return -EINVAL;
 313         }
 314         /*
 315          * Make sure that AuthMethod does not contain None as an option
 316          * unless explictly disabled.  Set the default to CHAP if authentication
 317          * is enforced (as per default), and remove the NONE option.
 318          */
 319         param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
 320         if (!param)
 321                 return -EINVAL;
 322
 323         if (tpg->tpg_attrib.authentication) {
 324                 if (!strcmp(param->value, NONE)) {
 325                         ret = iscsi_update_param_value(param, CHAP);
 326                         if (ret)
 327                                 goto err;
 328                 }
 329
 330                 ret = iscsit_ta_authentication(tpg, 1);
 331                 if (ret < 0)
 332                         goto err;
 333         }
 334
 335         spin_lock(&tpg->tpg_state_lock);
 336         tpg->tpg_state = TPG_STATE_ACTIVE;
 337         spin_unlock(&tpg->tpg_state_lock);
 338
 339         spin_lock(&tiqn->tiqn_tpg_lock);
 340         tiqn->tiqn_active_tpgs++;
 341         pr_debug("iSCSI_TPG[%hu] - Enabled iSCSI Target Portal Group\n",
 342                         tpg->tpgt);
 343         spin_unlock(&tiqn->tiqn_tpg_lock);
 344
 345         return 0;
 346
 347 err:
 348         return ret;
 349 }
 350
 351 int iscsit_tpg_disable_portal_group(struct iscsi_portal_group *tpg, int force)
 352 {
 353         struct iscsi_tiqn *tiqn;
 354         u8 old_state = tpg->tpg_state;
 355
 356         spin_lock(&tpg->tpg_state_lock);
 357         if (tpg->tpg_state == TPG_STATE_INACTIVE) {
 358                 pr_err("iSCSI Target Portal Group: %hu is already"
 359                         " inactive, ignoring request.\n", tpg->tpgt);
 360                 spin_unlock(&tpg->tpg_state_lock);
 361                 return -EINVAL;
 362         }
 363         tpg->tpg_state = TPG_STATE_INACTIVE;
 364         spin_unlock(&tpg->tpg_state_lock);
 365
 366         iscsit_clear_tpg_np_login_threads(tpg, false);
 367
 368         if (iscsit_release_sessions_for_tpg(tpg, force) < 0) {
 369                 spin_lock(&tpg->tpg_state_lock);
 370                 tpg->tpg_state = old_state;
 371                 spin_unlock(&tpg->tpg_state_lock);
 372                 pr_err("Unable to disable iSCSI Target Portal Group:"
 373                         " %hu while active sessions exist, and force=0\n",
 374                         tpg->tpgt);
 375                 return -EPERM;
 376         }
 377
 378         tiqn = tpg->tpg_tiqn;
 379         if (!tiqn || (tpg == iscsit_global->discovery_tpg))
 380                 return 0;
 381
 382         spin_lock(&tiqn->tiqn_tpg_lock);
 383         tiqn->tiqn_active_tpgs--;
 384         pr_debug("iSCSI_TPG[%hu] - Disabled iSCSI Target Portal Group\n",
 385                         tpg->tpgt);
 386         spin_unlock(&tiqn->tiqn_tpg_lock);
 387
 388         return 0;
 389 }
 390
 391 struct iscsi_node_attrib *iscsit_tpg_get_node_attrib(
 392         struct iscsit_session *sess)
 393 {
 394         struct se_session *se_sess = sess->se_sess;
 395         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 396         struct iscsi_node_acl *acl = to_iscsi_nacl(se_nacl);
 397
 398         return &acl->node_attrib;
 399 }
 400
 401 struct iscsi_tpg_np *iscsit_tpg_locate_child_np(
 402         struct iscsi_tpg_np *tpg_np,
 403         int network_transport)
 404 {
 405         struct iscsi_tpg_np *tpg_np_child, *tpg_np_child_tmp;
 406
 407         spin_lock(&tpg_np->tpg_np_parent_lock);
 408         list_for_each_entry_safe(tpg_np_child, tpg_np_child_tmp,
 409                         &tpg_np->tpg_np_parent_list, tpg_np_child_list) {
 410                 if (tpg_np_child->tpg_np->np_network_transport ==
 411                                 network_transport) {
 412                         spin_unlock(&tpg_np->tpg_np_parent_lock);
 413                         return tpg_np_child;
 414                 }
 415         }
 416         spin_unlock(&tpg_np->tpg_np_parent_lock);
 417
 418         return NULL;
 419 }
 420
 421 static bool iscsit_tpg_check_network_portal(
 422         struct iscsi_tiqn *tiqn,
 423         struct sockaddr_storage *sockaddr,
 424         int network_transport)
 425 {
 426         struct iscsi_portal_group *tpg;
 427         struct iscsi_tpg_np *tpg_np;
 428         struct iscsi_np *np;
 429         bool match = false;
 430
 431         spin_lock(&tiqn->tiqn_tpg_lock);
 432         list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
 433
 434                 spin_lock(&tpg->tpg_np_lock);
 435                 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
 436                         np = tpg_np->tpg_np;
 437
 438                         match = iscsit_check_np_match(sockaddr, np,
 439                                                 network_transport);
 440                         if (match)
 441                                 break;
 442                 }
 443                 spin_unlock(&tpg->tpg_np_lock);
 444
 445                 if (match)
 446                         break;
 447         }
 448         spin_unlock(&tiqn->tiqn_tpg_lock);
 449
 450         return match;
 451 }
 452
 453 struct iscsi_tpg_np *iscsit_tpg_add_network_portal(
 454         struct iscsi_portal_group *tpg,
 455         struct sockaddr_storage *sockaddr,
 456         struct iscsi_tpg_np *tpg_np_parent,
 457         int network_transport)
 458 {
 459         struct iscsi_np *np;
 460         struct iscsi_tpg_np *tpg_np;
 461
 462         if (!tpg_np_parent) {
 463                 if (iscsit_tpg_check_network_portal(tpg->tpg_tiqn, sockaddr,
 464                                 network_transport)) {
 465                         pr_err("Network Portal: %pISc already exists on a"
 466                                 " different TPG on %s\n", sockaddr,
 467                                 tpg->tpg_tiqn->tiqn);
 468                         return ERR_PTR(-EEXIST);
 469                 }
 470         }
 471
 472         tpg_np = kzalloc(sizeof(struct iscsi_tpg_np), GFP_KERNEL);
 473         if (!tpg_np) {
 474                 pr_err("Unable to allocate memory for"
 475                                 " struct iscsi_tpg_np.\n");
 476                 return ERR_PTR(-ENOMEM);
 477         }
 478
 479         np = iscsit_add_np(sockaddr, network_transport);
 480         if (IS_ERR(np)) {
 481                 kfree(tpg_np);
 482                 return ERR_CAST(np);
 483         }
 484
 485         INIT_LIST_HEAD(&tpg_np->tpg_np_list);
 486         INIT_LIST_HEAD(&tpg_np->tpg_np_child_list);
 487         INIT_LIST_HEAD(&tpg_np->tpg_np_parent_list);
 488         spin_lock_init(&tpg_np->tpg_np_parent_lock);
 489         init_completion(&tpg_np->tpg_np_comp);
 490         kref_init(&tpg_np->tpg_np_kref);
 491         tpg_np->tpg_np          = np;
 492         tpg_np->tpg             = tpg;
 493
 494         spin_lock(&tpg->tpg_np_lock);
 495         list_add_tail(&tpg_np->tpg_np_list, &tpg->tpg_gnp_list);
 496         tpg->num_tpg_nps++;
 497         if (tpg->tpg_tiqn)
 498                 tpg->tpg_tiqn->tiqn_num_tpg_nps++;
 499         spin_unlock(&tpg->tpg_np_lock);
 500
 501         if (tpg_np_parent) {
 502                 tpg_np->tpg_np_parent = tpg_np_parent;
 503                 spin_lock(&tpg_np_parent->tpg_np_parent_lock);
 504                 list_add_tail(&tpg_np->tpg_np_child_list,
 505                         &tpg_np_parent->tpg_np_parent_list);
 506                 spin_unlock(&tpg_np_parent->tpg_np_parent_lock);
 507         }
 508
 509         pr_debug("CORE[%s] - Added Network Portal: %pISpc,%hu on %s\n",
 510                 tpg->tpg_tiqn->tiqn, &np->np_sockaddr, tpg->tpgt,
 511                 np->np_transport->name);
 512
 513         return tpg_np;
 514 }
 515
 516 static int iscsit_tpg_release_np(
 517         struct iscsi_tpg_np *tpg_np,
 518         struct iscsi_portal_group *tpg,
 519         struct iscsi_np *np)
 520 {
 521         iscsit_clear_tpg_np_login_thread(tpg_np, tpg, true);
 522
 523         pr_debug("CORE[%s] - Removed Network Portal: %pISpc,%hu on %s\n",
 524                 tpg->tpg_tiqn->tiqn, &np->np_sockaddr, tpg->tpgt,
 525                 np->np_transport->name);
 526
 527         tpg_np->tpg_np = NULL;
 528         tpg_np->tpg = NULL;
 529         kfree(tpg_np);
 530         /*
 531          * iscsit_del_np() will shutdown struct iscsi_np when last TPG reference is released.
 532          */
 533         return iscsit_del_np(np);
 534 }
 535
 536 int iscsit_tpg_del_network_portal(
 537         struct iscsi_portal_group *tpg,
 538         struct iscsi_tpg_np *tpg_np)
 539 {
 540         struct iscsi_np *np;
 541         struct iscsi_tpg_np *tpg_np_child, *tpg_np_child_tmp;
 542         int ret = 0;
 543
 544         np = tpg_np->tpg_np;
 545         if (!np) {
 546                 pr_err("Unable to locate struct iscsi_np from"
 547                                 " struct iscsi_tpg_np\n");
 548                 return -EINVAL;
 549         }
 550
 551         if (!tpg_np->tpg_np_parent) {
 552                 /*
 553                  * We are the parent tpg network portal.  Release all of the
 554                  * child tpg_np's (eg: the non ISCSI_TCP ones) on our parent
 555                  * list first.
 556                  */
 557                 list_for_each_entry_safe(tpg_np_child, tpg_np_child_tmp,
 558                                 &tpg_np->tpg_np_parent_list,
 559                                 tpg_np_child_list) {
 560                         ret = iscsit_tpg_del_network_portal(tpg, tpg_np_child);
 561                         if (ret < 0)
 562                                 pr_err("iscsit_tpg_del_network_portal()"
 563                                         " failed: %d\n", ret);
 564                 }
 565         } else {
 566                 /*
 567                  * We are not the parent ISCSI_TCP tpg network portal.  Release
 568                  * our own network portals from the child list.
 569                  */
 570                 spin_lock(&tpg_np->tpg_np_parent->tpg_np_parent_lock);
 571                 list_del(&tpg_np->tpg_np_child_list);
 572                 spin_unlock(&tpg_np->tpg_np_parent->tpg_np_parent_lock);
 573         }
 574
 575         spin_lock(&tpg->tpg_np_lock);
 576         list_del(&tpg_np->tpg_np_list);
 577         tpg->num_tpg_nps--;
 578         if (tpg->tpg_tiqn)
 579                 tpg->tpg_tiqn->tiqn_num_tpg_nps--;
 580         spin_unlock(&tpg->tpg_np_lock);
 581
 582         return iscsit_tpg_release_np(tpg_np, tpg, np);
 583 }
 584
 585 int iscsit_ta_authentication(struct iscsi_portal_group *tpg, u32 authentication)
 586 {
 587         unsigned char buf1[256], buf2[256], *none = NULL;
 588         int len;
 589         struct iscsi_param *param;
 590         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 591
 592         if ((authentication != 1) && (authentication != 0)) {
 593                 pr_err("Illegal value for authentication parameter:"
 594                         " %u, ignoring request.\n", authentication);
 595                 return -EINVAL;
 596         }
 597
 598         memset(buf1, 0, sizeof(buf1));
 599         memset(buf2, 0, sizeof(buf2));
 600
 601         param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
 602         if (!param)
 603                 return -EINVAL;
 604
 605         if (authentication) {
 606                 snprintf(buf1, sizeof(buf1), "%s", param->value);
 607                 none = strstr(buf1, NONE);
 608                 if (!none)
 609                         goto out;
 610                 if (!strncmp(none + 4, ",", 1)) {
 611                         if (!strcmp(buf1, none))
 612                                 sprintf(buf2, "%s", none+5);
 613                         else {
 614                                 none--;
 615                                 *none = '\0';
 616                                 len = sprintf(buf2, "%s", buf1);
 617                                 none += 5;
 618                                 sprintf(buf2 + len, "%s", none);
 619                         }
 620                 } else {
 621                         none--;
 622                         *none = '\0';
 623                         sprintf(buf2, "%s", buf1);
 624                 }
 625                 if (iscsi_update_param_value(param, buf2) < 0)
 626                         return -EINVAL;
 627         } else {
 628                 snprintf(buf1, sizeof(buf1), "%s", param->value);
 629                 none = strstr(buf1, NONE);
 630                 if (none)
 631                         goto out;
 632                 strlcat(buf1, "," NONE, sizeof(buf1));
 633                 if (iscsi_update_param_value(param, buf1) < 0)
 634                         return -EINVAL;
 635         }
 636
 637 out:
 638         a->authentication = authentication;
 639         pr_debug("%s iSCSI Authentication Methods for TPG: %hu.\n",
 640                 a->authentication ? "Enforcing" : "Disabling", tpg->tpgt);
 641
 642         return 0;
 643 }
 644
 645 int iscsit_ta_login_timeout(
 646         struct iscsi_portal_group *tpg,
 647         u32 login_timeout)
 648 {
 649         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 650
 651         if (login_timeout > TA_LOGIN_TIMEOUT_MAX) {
 652                 pr_err("Requested Login Timeout %u larger than maximum"
 653                         " %u\n", login_timeout, TA_LOGIN_TIMEOUT_MAX);
 654                 return -EINVAL;
 655         } else if (login_timeout < TA_LOGIN_TIMEOUT_MIN) {
 656                 pr_err("Requested Logout Timeout %u smaller than"
 657                         " minimum %u\n", login_timeout, TA_LOGIN_TIMEOUT_MIN);
 658                 return -EINVAL;
 659         }
 660
 661         a->login_timeout = login_timeout;
 662         pr_debug("Set Logout Timeout to %u for Target Portal Group"
 663                 " %hu\n", a->login_timeout, tpg->tpgt);
 664
 665         return 0;
 666 }
 667
 668 int iscsit_ta_generate_node_acls(
 669         struct iscsi_portal_group *tpg,
 670         u32 flag)
 671 {
 672         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 673
 674         if ((flag != 0) && (flag != 1)) {
 675                 pr_err("Illegal value %d\n", flag);
 676                 return -EINVAL;
 677         }
 678
 679         a->generate_node_acls = flag;
 680         pr_debug("iSCSI_TPG[%hu] - Generate Initiator Portal Group ACLs: %s\n",
 681                 tpg->tpgt, (a->generate_node_acls) ? "Enabled" : "Disabled");
 682
 683         if (flag == 1 && a->cache_dynamic_acls == 0) {
 684                 pr_debug("Explicitly setting cache_dynamic_acls=1 when "
 685                         "generate_node_acls=1\n");
 686                 a->cache_dynamic_acls = 1;
 687         }
 688
 689         return 0;
 690 }
 691
 692 int iscsit_ta_default_cmdsn_depth(
 693         struct iscsi_portal_group *tpg,
 694         u32 tcq_depth)
 695 {
 696         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 697
 698         if (tcq_depth > TA_DEFAULT_CMDSN_DEPTH_MAX) {
 699                 pr_err("Requested Default Queue Depth: %u larger"
 700                         " than maximum %u\n", tcq_depth,
 701                                 TA_DEFAULT_CMDSN_DEPTH_MAX);
 702                 return -EINVAL;
 703         } else if (tcq_depth < TA_DEFAULT_CMDSN_DEPTH_MIN) {
 704                 pr_err("Requested Default Queue Depth: %u smaller"
 705                         " than minimum %u\n", tcq_depth,
 706                                 TA_DEFAULT_CMDSN_DEPTH_MIN);
 707                 return -EINVAL;
 708         }
 709
 710         a->default_cmdsn_depth = tcq_depth;
 711         pr_debug("iSCSI_TPG[%hu] - Set Default CmdSN TCQ Depth to %u\n",
 712                 tpg->tpgt, a->default_cmdsn_depth);
 713
 714         return 0;
 715 }
 716
 717 int iscsit_ta_cache_dynamic_acls(
 718         struct iscsi_portal_group *tpg,
 719         u32 flag)
 720 {
 721         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 722
 723         if ((flag != 0) && (flag != 1)) {
 724                 pr_err("Illegal value %d\n", flag);
 725                 return -EINVAL;
 726         }
 727
 728         if (a->generate_node_acls == 1 && flag == 0) {
 729                 pr_debug("Skipping cache_dynamic_acls=0 when"
 730                         " generate_node_acls=1\n");
 731                 return 0;
 732         }
 733
 734         a->cache_dynamic_acls = flag;
 735         pr_debug("iSCSI_TPG[%hu] - Cache Dynamic Initiator Portal Group"
 736                 " ACLs %s\n", tpg->tpgt, (a->cache_dynamic_acls) ?
 737                 "Enabled" : "Disabled");
 738
 739         return 0;
 740 }
 741
 742 int iscsit_ta_demo_mode_write_protect(
 743         struct iscsi_portal_group *tpg,
 744         u32 flag)
 745 {
 746         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 747
 748         if ((flag != 0) && (flag != 1)) {
 749                 pr_err("Illegal value %d\n", flag);
 750                 return -EINVAL;
 751         }
 752
 753         a->demo_mode_write_protect = flag;
 754         pr_debug("iSCSI_TPG[%hu] - Demo Mode Write Protect bit: %s\n",
 755                 tpg->tpgt, (a->demo_mode_write_protect) ? "ON" : "OFF");
 756
 757         return 0;
 758 }
 759
 760 int iscsit_ta_prod_mode_write_protect(
 761         struct iscsi_portal_group *tpg,
 762         u32 flag)
 763 {
 764         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 765
 766         if ((flag != 0) && (flag != 1)) {
 767                 pr_err("Illegal value %d\n", flag);
 768                 return -EINVAL;
 769         }
 770
 771         a->prod_mode_write_protect = flag;
 772         pr_debug("iSCSI_TPG[%hu] - Production Mode Write Protect bit:"
 773                 " %s\n", tpg->tpgt, (a->prod_mode_write_protect) ?
 774                 "ON" : "OFF");
 775
 776         return 0;
 777 }
 778
 779 int iscsit_ta_demo_mode_discovery(
 780         struct iscsi_portal_group *tpg,
 781         u32 flag)
 782 {
 783         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 784
 785         if ((flag != 0) && (flag != 1)) {
 786                 pr_err("Illegal value %d\n", flag);
 787                 return -EINVAL;
 788         }
 789
 790         a->demo_mode_discovery = flag;
 791         pr_debug("iSCSI_TPG[%hu] - Demo Mode Discovery bit:"
 792                 " %s\n", tpg->tpgt, (a->demo_mode_discovery) ?
 793                 "ON" : "OFF");
 794
 795         return 0;
 796 }
 797
 798 int iscsit_ta_default_erl(
 799         struct iscsi_portal_group *tpg,
 800         u32 default_erl)
 801 {
 802         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 803
 804         if ((default_erl != 0) && (default_erl != 1) && (default_erl != 2)) {
 805                 pr_err("Illegal value for default_erl: %u\n", default_erl);
 806                 return -EINVAL;
 807         }
 808
 809         a->default_erl = default_erl;
 810         pr_debug("iSCSI_TPG[%hu] - DefaultERL: %u\n", tpg->tpgt, a->default_erl);
 811
 812         return 0;
 813 }
 814
 815 int iscsit_ta_t10_pi(
 816         struct iscsi_portal_group *tpg,
 817         u32 flag)
 818 {
 819         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 820
 821         if ((flag != 0) && (flag != 1)) {
 822                 pr_err("Illegal value %d\n", flag);
 823                 return -EINVAL;
 824         }
 825
 826         a->t10_pi = flag;
 827         pr_debug("iSCSI_TPG[%hu] - T10 Protection information bit:"
 828                 " %s\n", tpg->tpgt, (a->t10_pi) ?
 829                 "ON" : "OFF");
 830
 831         return 0;
 832 }
 833
 834 int iscsit_ta_fabric_prot_type(
 835         struct iscsi_portal_group *tpg,
 836         u32 prot_type)
 837 {
 838         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 839
 840         if ((prot_type != 0) && (prot_type != 1) && (prot_type != 3)) {
 841                 pr_err("Illegal value for fabric_prot_type: %u\n", prot_type);
 842                 return -EINVAL;
 843         }
 844
 845         a->fabric_prot_type = prot_type;
 846         pr_debug("iSCSI_TPG[%hu] - T10 Fabric Protection Type: %u\n",
 847                  tpg->tpgt, prot_type);
 848
 849         return 0;
 850 }
 851
 852 int iscsit_ta_tpg_enabled_sendtargets(
 853         struct iscsi_portal_group *tpg,
 854         u32 flag)
 855 {
 856         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 857
 858         if ((flag != 0) && (flag != 1)) {
 859                 pr_err("Illegal value %d\n", flag);
 860                 return -EINVAL;
 861         }
 862
 863         a->tpg_enabled_sendtargets = flag;
 864         pr_debug("iSCSI_TPG[%hu] - TPG enabled bit required for SendTargets:"
 865                 " %s\n", tpg->tpgt, (a->tpg_enabled_sendtargets) ? "ON" : "OFF");
 866
 867         return 0;
 868 }
 869
 870 int iscsit_ta_login_keys_workaround(
 871         struct iscsi_portal_group *tpg,
 872         u32 flag)
 873 {
 874         struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 875
 876         if ((flag != 0) && (flag != 1)) {
 877                 pr_err("Illegal value %d\n", flag);
 878                 return -EINVAL;
 879         }
 880
 881         a->login_keys_workaround = flag;
 882         pr_debug("iSCSI_TPG[%hu] - TPG enabled bit for login keys workaround: %s ",
 883                 tpg->tpgt, (a->login_keys_workaround) ? "ON" : "OFF");
 884
 885         return 0;
 886 }